refactor resolver

Refactor

.github/workflows/auto-assign.yml

@@ -0,0 +1,20 @@
+name: Auto Assign
+on:
+  issues:
+    types: [opened]
+  pull_request:
+    types: [opened]
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+    - name: 'Auto-assign issue'
+      uses: pozil/auto-assign-issue@v1
+      with:
+          repo-token:${{ secrets.GITHUB_TOKEN }}
+          assignees: eyedeekay
+          numOfAssignee: 1
+

.gitignore

@@ -1,2 +1,4 @@
 *~
 *.swp
+README.md.asc
+log

I2PAddr.go

@@ -1,119 +0,0 @@
-package sam3
-
-import (
-	"crypto/sha256"
-	"encoding/base32"
-	"encoding/base64"
-	"errors"
-)
-
-
-
-var (
-	i2pB64enc *base64.Encoding = base64.NewEncoding("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-~")
-	i2pB32enc *base32.Encoding = base32.NewEncoding("abcdefghijklmnopqrstuvwxyz234567")
-)
-
-
-// The public and private keys associated with an I2P destination. I2P hides the
-// details of exactly what this is, so treat them as blobs, but generally: One
-// pair of DSA keys, one pair of ElGamal keys, and sometimes (almost never) also
-// a certificate. String() returns you the full content of I2PKeys and Addr() 
-// returns the public keys.
-type I2PKeys struct {
-	addr    I2PAddr       // only the public key
-	both    string        // both public and private keys
-}
-
-// Creates I2PKeys from an I2PAddr and a public/private keypair string (as 
-// generated by String().)
-func NewKeys(addr I2PAddr, both string) I2PKeys {
-	return I2PKeys{addr, both}
-}
-
-// Returns the public keys of the I2PKeys.
-func (k I2PKeys) Addr() I2PAddr {
-	return k.addr
-}
-
-// Returns the keys (both public and private), in I2Ps base64 format. Use this
-// when you create sessions.
-func (k I2PKeys) String() string {
-	return k.both
-}
-
-// I2PAddr represents an I2P destination, almost equivalent to an IP address.
-// This is the humongously huge base64 representation of such an address, which
-// really is just a pair of public keys and also maybe a certificate. (I2P hides
-// the details of exactly what it is. Read the I2P specifications for more info.)
-type I2PAddr string
-
-// Returns the base64 representation of the I2PAddr
-func (a I2PAddr) Base64() string {
-	return string(a)
-}
-
-// Returns the I2P destination (base64-encoded)
-func (a I2PAddr) String() string {
-	return string(a)
-}
-
-// Returns "I2P"
-func (a I2PAddr) Network() string {
-	return "I2P"
-}
-
-// Creates a new I2P address from a base64-encoded string. Checks if the address
-// addr is in correct format. (If you know for sure it is, use I2PAddr(addr).)
-func NewI2PAddrFromString(addr string) (I2PAddr, error) {
-	// very basic check
-	if len(addr) > 4096 || len(addr) < 516 {
-		return I2PAddr(""), errors.New("Not an I2P address")
-	}
-	buf := make([]byte, i2pB64enc.DecodedLen(len(addr)))
-	if _, err := i2pB64enc.Decode(buf, []byte(addr)); err != nil {
-		return I2PAddr(""), errors.New("Address is not base64-encoded")
-	}
-	return I2PAddr(addr), nil
-}
-
-// Creates a new I2P address from a byte array. The inverse of ToBytes().
-func NewI2PAddrFromBytes(addr []byte) (I2PAddr, error) {
-	if len(addr) > 4096 || len(addr) < 384 {
-		return I2PAddr(""), errors.New("Not an I2P address")
-	}
-	buf := make([]byte, i2pB64enc.EncodedLen(len(addr)))
-	i2pB64enc.Encode(buf, addr)
-	return I2PAddr(string(buf)), nil
-}
-
-// Turns an I2P address to a byte array. The inverse of NewI2PAddrFromBytes().
-func (addr I2PAddr) ToBytes() ([]byte, error) {
-	buf := make([]byte, i2pB64enc.DecodedLen(len(addr)))
-	if _, err := i2pB64enc.Decode(buf, []byte(addr)); err != nil {
-		return buf, errors.New("Address is not base64-encoded")
-	}
-	return buf, nil
-}
-
-// Returns the *.b32.i2p address of the I2P address. It is supposed to be a 
-// somewhat human-manageable 64 character long pseudo-domain name equivalent of 
-// the 516+ characters long default base64-address (the I2PAddr format). It is 
-// not possible to turn the base32-address back into a usable I2PAddr without 
-// performing a Lookup(). Lookup only works if you are using the I2PAddr from
-// which the b32 address was generated.
-func (addr I2PAddr) Base32() string {
-	hash := sha256.New()
-	b, _ := addr.ToBytes()
-	hash.Write(b)
-	digest := hash.Sum(nil)
-	b32addr := make([]byte, 56)
-	i2pB32enc.Encode(b32addr, digest)
-	return string(b32addr[:52]) + ".b32.i2p"
-}
-
-// Makes any string into a *.b32.i2p human-readable I2P address. This makes no
-// sense, unless "anything" is an I2P destination of some sort.
-func Base32(anything string) string {
-	return I2PAddr(anything).Base32()
-}

LICENSE

@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>

Makefile

@@ -0,0 +1,30 @@
+
+USER_GH=go-i2p
+VERSION=0.33.92
+CREDIT='contributors to this release: @hkh4n, @eyedeekay'
+packagename=sam3
+
+echo:
+	@echo "type make version to do release $(VERSION)"
+
+version:
+	github-release release -s $(GITHUB_TOKEN) -u $(USER_GH) -r $(packagename) -t v$(VERSION) -d "version $(VERSION) $(CREDIT)"
+
+del:
+	github-release delete -s $(GITHUB_TOKEN) -u $(USER_GH) -r $(packagename) -t v$(VERSION)
+
+tar:
+	tar --exclude .git \
+		--exclude .go \
+		--exclude bin \
+		-cJvf ../$(packagename)_$(VERSION).orig.tar.xz .
+
+copier:
+	echo '#! /usr/bin/env sh' > deb/copy.sh
+	echo 'for f in $$(ls); do scp $$f/*.deb user@192.168.99.106:~/DEBIAN_PKGS/$$f/main/; done' >> deb/copy.sh
+
+fmt:
+	find . -name '*.go' -exec gofumpt -w -s -extra {} \;
+
+upload-linux:
+	github-release upload -R -u $(USER_GH) -r "$(packagename)" -t $(VERSION) -l `sha256sum ` -n "$(packagename)" -f "$(packagename)"

README.md

@@ -1,5 +1,11 @@
 # README #
 
+STATUS: This project is maintained. I will respond to issues, pull requests, and feature requests within a few days.
+
+[![Go Report Card](https://goreportcard.com/badge/github.com/go-i2p/sam3)](https://goreportcard.com/report/github.com/go-i2p/sam3)
+
+# README #
+
 go library for the I2P [SAMv3.0](https://geti2p.net/en/docs/api/samv3) bridge, used to build anonymous/pseudonymous end-to-end encrypted sockets.
 
 This library is much better than ccondom (that use BOB), much more stable and much easier to maintain.
@@ -23,13 +29,11 @@ This library is much better than ccondom (that use BOB), much more stable and mu
 
 **Does not work:**
 
-* Everything works! :D
+* Stream Forwarding
 * Probably needs some real-world testing
 
 ## Documentation ##
 
-* [Online cached version](http://godoc.org/bitbucket.org/kallevedin/sam3)
-
 * Latest version-documentation:
     * set your GOPATH
     * Enter `godoc -http=:8081` into your terminal and hit enter.
@@ -40,16 +44,17 @@ This library is much better than ccondom (that use BOB), much more stable and mu
 package main
 
 import (
-	"bitbucket.org/kallevedin/sam3"
+	"github.com/go-i2p/sam3"
+	"github.com/go-i2p/sam3/i2pkeys"
 	"fmt"
 )
 
 const yoursam = "127.0.0.1:7656" // sam bridge
 
-func client(server I2PAddr) {
+func client(server i2pkeys.I2PAddr) {
-	sam, _ := NewSAM(yoursam)
+	sam, _ := sam3.NewSAM(yoursam)
 	keys, _ := sam.NewKeys()
-	stream, _ := sam.NewStreamSession("clientTun", keys, Options_Small)
+	stream, _ := sam.NewStreamSession("clientTun", keys, sam3.Options_Small)
 	fmt.Println("Client: Connecting to " + server.Base32())
 	conn, _ := stream.DialI2P(server)
 	conn.Write([]byte("Hello world!"))
@@ -59,9 +64,9 @@ func client(server I2PAddr) {
 func main() {
 	sam, _ := NewSAM(yoursam)
 	keys, _ := sam.NewKeys()
-	go client(keys.Addr())
+	stream, _ := sam.NewStreamSession("serverTun", keys, sam3.Options_Medium)
-	stream, _ := sam.NewStreamSession("serverTun", keys, Options_Medium)
 	listener, _ := stream.Listen()
+	go client(keys.Addr())
 	conn, _ := listener.Accept()
 	buf := make([]byte, 4096)
 	n, _ := conn.Read(buf)
@@ -80,14 +85,36 @@ Error handling was omitted in the above code for readability.
 
 ## Testing ##
 
-* `go test` runs the whole suite (takes 90+ sec to perform!)
+* `go test -tags=nettest` runs the whole suite (takes 90+ sec to perform!)
 * `go test -short` runs the shorter variant, does not connect to anything
 
+## Verbosity ##
+Logging can be enabled and configured using the DEBUG_I2P environment variable. By default, logging is disabled.
+
+There are three available log levels:
+
+- Debug
+```shell
+export DEBUG_I2P=debug
+```
+- Warn
+```shell
+export DEBUG_I2P=warn
+```
+- Error
+```shell
+export DEBUG_I2P=error
+```
+
+If DEBUG_I2P is set to an unrecognized variable, it will fall back to "debug".
+
 ## License ##
 
 Public domain.
 
-## Authors ##
+## Author ##
 
 * Kalle Vedin `kalle.vedin@fripost.org`
-* Unknown Name (majestrate)
+* Unknown Name (majestrate)
+* idk
+* qiwenmin

README.md.asc

@@ -0,0 +1,105 @@
+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA512
+
+# README #
+
+go library for the I2P [SAMv3.0](https://geti2p.net/en/docs/api/samv3) bridge, used to build anonymous/pseudonymous end-to-end encrypted sockets.
+
+This library is much better than ccondom (that use BOB), much more stable and much easier to maintain.
+
+## Support/TODO ##
+
+**What works:**
+
+* Utils
+    * Resolving domain names to I2P destinations
+    * .b32.i2p hashes
+    * Generating keys/i2p destinations
+* Streaming
+    * DialI2P() - Connecting to stuff in I2P
+    * Listen()/Accept() - Handling incomming connections
+    * Implements net.Conn and net.Listener
+* Datagrams
+    * Implements net.PacketConn
+* Raw datagrams
+    * Like datagrams, but without addresses
+
+**Does not work:**
+
+* Everything works! :D
+* Probably needs some real-world testing
+
+## Documentation ##
+
+* Latest version-documentation:
+    * set your GOPATH
+    * Enter `godoc -http=:8081` into your terminal and hit enter.
+    * Goto http://localhost:8081, click packages, and navigate to sam3
+
+## Examples ##
+```go
+package main
+
+import (
+	"github.com/majestrate/i2p-tools/sam3"
+	"fmt"
+)
+
+const yoursam = "127.0.0.1:7656" // sam bridge
+
+func client(server I2PAddr) {
+	sam, _ := NewSAM(yoursam)
+	keys, _ := sam.NewKeys()
+	stream, _ := sam.NewStreamSession("clientTun", keys, Options_Small)
+	fmt.Println("Client: Connecting to " + server.Base32())
+	conn, _ := stream.DialI2P(server)
+	conn.Write([]byte("Hello world!"))
+	return
+}
+
+func main() {
+	sam, _ := NewSAM(yoursam)
+	keys, _ := sam.NewKeys()
+	go client(keys.Addr())
+	stream, _ := sam.NewStreamSession("serverTun", keys, Options_Medium)
+	listener, _ := stream.Listen()
+	conn, _ := listener.Accept()
+	buf := make([]byte, 4096)
+	n, _ := conn.Read(buf)
+	fmt.Println("Server received: " + string(buf[:n]))
+}
+```
+
+The above will write to the terminal:
+
+```text
+Client: Connecting to zjnvfh4hs3et5vtz35ogwzrws26zvwkcad5uo5esecvg4qpk5b4a.b32.i2p
+Server received: Hello world!
+```
+
+Error handling was omitted in the above code for readability.
+
+## Testing ##
+
+* `go test` runs the whole suite (takes 90+ sec to perform!)
+* `go test -short` runs the shorter variant, does not connect to anything
+
+## License ##
+
+Public domain.
+
+## Author ##
+
+* Kalle Vedin `kalle.vedin@fripost.org`
+* Unknown Name (majestrate)
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+-----END PGP SIGNATURE-----

SAMConn.go

@@ -1,57 +1,66 @@
 package sam3
 
 import (
-	"time"
 	"net"
+	"time"
+
+	"github.com/go-i2p/i2pkeys"
 )
 
+// SAMConn sets up a SAM connection.
 // Implements net.Conn
 type SAMConn struct {
-	laddr  I2PAddr
+	laddr i2pkeys.I2PAddr
-	raddr  I2PAddr
+	raddr i2pkeys.I2PAddr
-	conn   net.Conn
+	net.Conn
 }
 
-// Implements net.Conn
+// Read implements net.Conn
-func (sc SAMConn) Read(buf []byte) (int, error) {
+func (sc *SAMConn) Read(buf []byte) (int, error) {
-	n, err := sc.conn.Read(buf)
+	n, err := sc.Conn.Read(buf)
 	return n, err
 }
 
-// Implements net.Conn
+// Write Implements net.Conn
-func (sc SAMConn) Write(buf []byte) (int, error) {
+func (sc *SAMConn) Write(buf []byte) (int, error) {
-	n, err := sc.conn.Write(buf)
+	n, err := sc.Conn.Write(buf)
 	return n, err
 }
 
-// Implements net.Conn
+// Close Implements net.Conn
-func (sc SAMConn) Close() error {
+func (sc *SAMConn) Close() error {
-	return sc.conn.Close()
+	return sc.Conn.Close()
 }
 
-// Implements net.Conn
+// LocalAddr Implements net.Conn
-func (sc SAMConn) LocalAddr() I2PAddr {
+func (sc *SAMConn) LocalAddr() net.Addr {
+	return sc.localAddr()
+}
+
+func (sc *SAMConn) localAddr() i2pkeys.I2PAddr {
 	return sc.laddr
 }
 
-// Implements net.Conn
+// RemoteAddr Implements net.Conn
-func (sc SAMConn) RemoteAddr() I2PAddr {
+func (sc *SAMConn) RemoteAddr() net.Addr {
+	return sc.remoteAddr()
+}
+
+func (sc *SAMConn) remoteAddr() i2pkeys.I2PAddr {
 	return sc.raddr
 }
 
-// Implements net.Conn
+// SetDeadline Implements net.Conn
-func (sc SAMConn) SetDeadline(t time.Time) error {
+func (sc *SAMConn) SetDeadline(t time.Time) error {
-	return sc.conn.SetDeadline(t)
+	return sc.Conn.SetDeadline(t)
 }
 
-// Implements net.Conn
+// SetReadDeadline Implements net.Conn
-func (sc SAMConn) SetReadDeadline(t time.Time) error {
+func (sc *SAMConn) SetReadDeadline(t time.Time) error {
-	return sc.conn.SetReadDeadline(t)
+	return sc.Conn.SetReadDeadline(t)
 }
 
-// Implements net.Conn
+// SetWriteDeadline Implements net.Conn
-func (sc SAMConn) SetWriteDeadline(t time.Time) error {
+func (sc *SAMConn) SetWriteDeadline(t time.Time) error {
-	return sc.conn.SetWriteDeadline(t)
+	return sc.Conn.SetWriteDeadline(t)
 }
-
-

common/formatter.go

@@ -0,0 +1,60 @@
+package common
+
+import (
+	"fmt"
+	"strings"
+)
+
+type SAMFormatter struct {
+	Version ProtocolVersion
+}
+
+// Common SAM protocol message types
+const (
+	HelloMsg    = "HELLO"
+	SessionMsg  = "SESSION"
+	StreamMsg   = "STREAM"
+	DatagramMsg = "DATAGRAM"
+	RawMsg      = "RAW"
+	PrimaryMSG  = "PRIMARY"
+	NamingMsg   = "NAMING"
+)
+
+func NewSAMFormatter(version ProtocolVersion) *SAMFormatter {
+	return &SAMFormatter{Version: version}
+}
+
+// FormatHello formats the initial handshake message
+func (f *SAMFormatter) FormatHello() string {
+	return fmt.Sprintf("HELLO VERSION MIN=%s MAX=%s\n", f.Version, f.Version)
+}
+
+// FormatSession formats a session creation message
+func (f *SAMFormatter) FormatSession(style, id string, options map[string]string) string {
+	optStr := formatOptions(options)
+	return fmt.Sprintf("SESSION CREATE STYLE=%s ID=%s%s\n", style, id, optStr)
+}
+
+// FormatDatagram formats a datagram message
+func (f *SAMFormatter) FormatDatagram(sessionID, dest string, options map[string]string) string {
+	optStr := formatOptions(options)
+	return fmt.Sprintf("DATAGRAM SEND ID=%s DESTINATION=%s%s\n", sessionID, dest, optStr)
+}
+
+// FormatNamingLookup formats a naming lookup message
+func (f *SAMFormatter) FormatNamingLookup(name string) string {
+	return fmt.Sprintf("NAMING LOOKUP NAME=%s\n", name)
+}
+
+// Helper function to format options
+func formatOptions(options map[string]string) string {
+	if len(options) == 0 {
+		return ""
+	}
+
+	var opts []string
+	for k, v := range options {
+		opts = append(opts, fmt.Sprintf(" %s=%s", k, v))
+	}
+	return strings.Join(opts, "")
+}

common/reply.go

@@ -0,0 +1,87 @@
+// common/reply.go
+package common
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Reply represents a parsed SAM bridge response
+type Reply struct {
+	Topic     string            // e.g., "HELLO", "SESSION", "STREAM", etc.
+	Type      string            // Usually "REPLY"
+	Result    string            // "OK" or error message
+	KeyValues map[string]string // Additional key-value pairs in the response
+}
+
+// ParseReply parses a raw SAM bridge response into a structured Reply
+func ParseReply(response string) (*Reply, error) {
+	parts := strings.Fields(response)
+	if len(parts) < 3 {
+		return nil, fmt.Errorf("invalid reply format: %s", response)
+	}
+
+	reply := &Reply{
+		Topic:     parts[0],
+		Type:      parts[1],
+		KeyValues: make(map[string]string),
+	}
+
+	// Parse remaining key=value pairs
+	for _, part := range parts[2:] {
+		if kv := strings.SplitN(part, "=", 2); len(kv) == 2 {
+			key := strings.ToUpper(kv[0])
+			if key == "RESULT" {
+				reply.Result = kv[1]
+			} else {
+				reply.KeyValues[key] = kv[1]
+			}
+		}
+	}
+
+	if reply.Result == "" {
+		return nil, fmt.Errorf("missing RESULT in reply: %s", response)
+	}
+
+	return reply, nil
+}
+
+// IsOk returns true if the reply indicates success
+func (r *Reply) IsOk() bool {
+	return r.Result == "OK"
+}
+
+// Error returns an error if the reply indicates failure
+func (r *Reply) Error() error {
+	if r.IsOk() {
+		return nil
+	}
+	return fmt.Errorf("%s failed: %s", r.Topic, r.Result)
+}
+
+// Value safely retrieves a value from KeyValues
+func (r *Reply) Value(key string) (string, bool) {
+	v, ok := r.KeyValues[strings.ToUpper(key)]
+	return v, ok
+}
+
+// MustValue gets a value or panics if not found
+func (r *Reply) MustValue(key string) string {
+	if v, ok := r.Value(key); ok {
+		return v
+	}
+	panic(fmt.Sprintf("required key not found: %s", key))
+}
+
+// Specific reply type checkers
+func (r *Reply) IsHello() bool {
+	return r.Topic == HelloMsg && r.Type == "REPLY"
+}
+
+func (r *Reply) IsSession() bool {
+	return r.Topic == SessionMsg && r.Type == "REPLY"
+}
+
+func (r *Reply) IsNaming() bool {
+	return r.Topic == NamingMsg && r.Type == "REPLY"
+}

common/udp.go

@@ -0,0 +1,140 @@
+package common
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"strconv"
+	"time"
+
+	"github.com/go-i2p/logger"
+)
+
+// Package common provides shared UDP common functionality for SAM sessions
+//
+// It handles:
+// - UDP port validation and defaults
+// - Address resolution
+// - Connection setup
+// - Logging
+//
+// Example Usage:
+//
+//   cfg := &UDPSessionConfig{
+//     Port: 7655,
+//     ParentConn: samConn,
+//     Log: logger,
+//   }
+//
+//   session, err := NewUDPSession(cfg)
+//   if err != nil {
+//     // Handle error
+//   }
+//   defer session.Close()
+
+// UDPSessionConfig holds all UDP session configuration
+type UDPSessionConfig struct {
+	Port          int
+	ParentConn    net.Conn
+	Log           *logger.Logger
+	DefaultPort   int
+	AllowZeroPort bool
+	Style         string
+	FromPort      string
+	ToPort        string
+	ReadTimeout   time.Duration
+	WriteTimeout  time.Duration
+}
+
+// UDPSession represents an established UDP session
+type UDPSession struct {
+	LocalAddr  *net.UDPAddr
+	RemoteAddr *net.UDPAddr
+	Conn       *net.UDPConn
+}
+
+func (u *UDPSession) SetReadTimeout(timeout time.Duration) error {
+	if u.Conn != nil {
+		return u.Conn.SetReadDeadline(time.Now().Add(timeout))
+	}
+	return nil
+}
+
+func (u *UDPSession) SetWriteTimeout(timeout time.Duration) error {
+	if u.Conn != nil {
+		return u.Conn.SetWriteDeadline(time.Now().Add(timeout))
+	}
+	return nil
+}
+
+func (u UDPSession) LocalPort() int {
+	return u.LocalAddr.Port
+}
+
+func (u UDPSession) Close() {
+	u.Conn.Close()
+}
+
+// NewUDPSession creates and configures a new UDP session
+func NewUDPSession(cfg *UDPSessionConfig) (*UDPSession, error) {
+	if err := validatePort(cfg.Port, cfg.AllowZeroPort); err != nil {
+		cfg.Log.WithError(err).Error("Invalid UDP port configuration")
+		return nil, err
+	}
+
+	port := cfg.Port
+	if port == 0 {
+		port = cfg.DefaultPort
+		cfg.Log.WithField("port", port).Debug("Using default UDP port")
+	}
+
+	laddr, raddr, err := resolveAddresses(cfg.ParentConn, port)
+	if err != nil {
+		return nil, fmt.Errorf("address resolution failed: %w", err)
+	}
+
+	conn, err := net.ListenUDP("udp4", laddr)
+	if err != nil {
+		return nil, fmt.Errorf("UDP listen failed: %w", err)
+	}
+
+	return &UDPSession{
+		LocalAddr:  laddr,
+		RemoteAddr: raddr,
+		Conn:       conn,
+	}, nil
+}
+
+func validatePort(port int, allowZero bool) error {
+	if port < 0 || port > 65535 {
+		return errors.New("port must be between 0-65535")
+	}
+	if port == 0 && !allowZero {
+		return errors.New("port 0 not allowed in this context")
+	}
+	return nil
+}
+
+func resolveAddresses(parent net.Conn, remotePort int) (*net.UDPAddr, *net.UDPAddr, error) {
+	lhost, _, err := net.SplitHostPort(parent.LocalAddr().String())
+	if err != nil {
+		return nil, nil, err
+	}
+
+	laddr, err := net.ResolveUDPAddr("udp4", lhost+":0")
+	if err != nil {
+		return nil, nil, err
+	}
+
+	rhost, _, err := net.SplitHostPort(parent.RemoteAddr().String())
+	if err != nil {
+		return nil, nil, err
+	}
+
+	raddr, err := net.ResolveUDPAddr("udp4", rhost+":"+strconv.Itoa(remotePort))
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return laddr, raddr, nil
+}

common/version.go

@@ -0,0 +1,19 @@
+package common
+
+type ProtocolVersion string
+
+type Version struct {
+	String ProtocolVersion
+	Number float64
+}
+
+var (
+	SAM31Version = Version{
+		String: "3.1",
+		Number: 3.1,
+	}
+	SAM33Version = Version{
+		String: "3.3",
+		Number: 3.3,
+	}
+)

config.go

@@ -0,0 +1,229 @@
+package sam3
+
+import (
+	"fmt"
+	"math/rand"
+	"strings"
+	"time"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/go-i2p/i2pkeys"
+	"github.com/go-i2p/sam3/common"
+	"github.com/go-i2p/sam3/config"
+)
+
+const DEFAULT_LEASESET_TYPE = "i2cp.leaseSetEncType=4"
+
+// I2PConfig is a struct which manages I2P configuration options
+type I2PConfig struct {
+	common.SAMFormatter
+	config.SessionOptions
+	config.TransportOptions
+	config.TunnelOptions
+	config.EncryptedLeaseSetOptions
+	DestinationKeys i2pkeys.I2PKeys
+
+	// Streaming Library options
+	AccessListType string
+	AccessList     []string
+}
+
+// Sam returns the SAM address in the form of "host:port"
+func (f *I2PConfig) Sam() string {
+	host := "127.0.0.1"
+	port := "7656"
+	if f.SamHost != "" {
+		host = f.SamHost
+	}
+	if f.SamPort != "" {
+		port = f.SamPort
+	}
+	log.WithFields(logrus.Fields{
+		"host": host,
+		"port": port,
+	}).Debug("SAM address constructed")
+	return fmt.Sprintf("%s:%s", host, port)
+}
+
+// SetSAMAddress sets the SAM address from a string in the form of "host:port"
+func (f *I2PConfig) SetSAMAddress(addr string) {
+	hp := strings.Split(addr, ":")
+	if len(hp) == 1 {
+		f.SamHost = hp[0]
+	} else if len(hp) == 2 {
+		f.SamPort = hp[1]
+		f.SamHost = hp[0]
+	} else {
+		if f.SamHost == "" {
+			f.SamHost = "127.0.0.1"
+		}
+		if f.SamPort == "" {
+			f.SamPort = "7656"
+		}
+	}
+	log.WithFields(logrus.Fields{
+		"host": f.SamHost,
+		"port": f.SamPort,
+	}).Debug("SAM address set")
+	i2pkeys.DefaultSAMAddress = f.Sam()
+}
+
+// ID returns the tunnel name in the form of "ID=name"
+func (f *I2PConfig) ID() string {
+	if f.NickName == "" {
+		b := make([]byte, 12)
+		for i := range b {
+			b[i] = "abcdefghijklmnopqrstuvwxyz"[rand.Intn(len("abcdefghijklmnopqrstuvwxyz"))]
+		}
+		f.NickName = string(b)
+		log.WithField("NickName", f.NickName).Debug("Generated random tunnel name")
+	}
+	return fmt.Sprintf(" ID=%s ", f.NickName)
+}
+
+// MinSAM returns the minimum SAM version required in major.minor form
+func (f *I2PConfig) MinSAM() string {
+	min, _ := f.GetVersions()
+	return string(min)
+}
+
+// MaxSAM returns the maximum SAM version required in major.minor form
+func (f *I2PConfig) MaxSAM() string {
+	_, max := f.GetVersions()
+	return string(max)
+}
+
+func (f *I2PConfig) GetVersions() (min, max common.ProtocolVersion) {
+	if f.SamMin == "" {
+		min = common.SAM31Version.String
+	} else {
+		min = common.ProtocolVersion(f.SamMin)
+	}
+	if f.SamMax == "" {
+		max = common.SAM33Version.String
+		log.Debug("Using default MaxSAM: 3.3")
+	} else {
+		max = common.ProtocolVersion(f.SamMax)
+	}
+	return min, max
+}
+
+// DestinationKey returns the destination key setting in the form of "DESTINATION=key"
+func (f *I2PConfig) DestinationKey() string {
+	if &f.DestinationKeys != nil {
+		log.WithField("destinationKey", f.DestinationKeys.String()).Debug("Destination key set")
+		fmt.Sprintf(" DESTINATION=%s ", f.DestinationKeys.String())
+	}
+	log.Debug("Using TRANSIENT destination")
+	return " DESTINATION=TRANSIENT "
+}
+
+// Print returns the full config as a string
+func (f *I2PConfig) Print() []string {
+	lsk, lspk, lspsk := f.Leasesetsettings()
+	return []string{
+		// f.targetForPort443(),
+		f.InboundLength(),
+		f.OutboundLength(),
+		f.InboundVariance(),
+		f.OutboundVariance(),
+		f.InboundBackupQuantity(),
+		f.OutboundBackupQuantity(),
+		f.InboundQuantity(),
+		f.OutboundQuantity(),
+		f.InboundDoZero(),
+		f.OutboundDoZero(),
+		//"i2cp.fastRecieve=" + f.FastRecieve,
+		f.DoFastReceive(),
+		f.UsesCompression(),
+		f.Reduce(),
+		f.Close(),
+		f.Reliability(),
+		f.EncryptLease(),
+		lsk, lspk, lspsk,
+		f.Accesslisttype(),
+		f.Accesslist(),
+		f.LeaseSetEncryptionType(),
+	}
+}
+
+// Accesslisttype returns the access list type
+func (f *I2PConfig) Accesslisttype() string {
+	if f.AccessListType == "whitelist" {
+		log.Debug("Access list type set to whitelist")
+		return "i2cp.enableAccessList=true"
+	} else if f.AccessListType == "blacklist" {
+		log.Debug("Access list type set to blacklist")
+		return "i2cp.enableBlackList=true"
+	} else if f.AccessListType == "none" {
+		log.Debug("Access list type set to none")
+		return ""
+	}
+	log.Debug("Access list type not set")
+	return ""
+}
+
+// Accesslist returns the access list in the form of "i2cp.accessList=list"
+func (f *I2PConfig) Accesslist() string {
+	if f.AccessListType != "" && len(f.AccessList) > 0 {
+		r := strings.Join(f.AccessList, ",")
+		log.WithField("accessList", r).Debug("Access list generated")
+		return fmt.Sprintf(" i2cp.accessList=%s ", r)
+	}
+	log.Debug("Access list not set")
+	return ""
+}
+
+// NewConfig returns a new config with default values or updates them with functional arguments
+func NewConfig(opts ...func(*I2PConfig) error) (*I2PConfig, error) {
+	config := I2PConfig{
+		EncryptedLeaseSetOptions: config.EncryptedLeaseSetOptions{
+			EncryptLeaseSet:           false,
+			LeaseSetKey:               "",
+			LeaseSetPrivateKey:        "",
+			LeaseSetPrivateSigningKey: "",
+			LeaseSetEncryption:        DEFAULT_LEASESET_TYPE,
+		},
+		TunnelOptions: config.TunnelOptions{
+			InAllowZeroHop:    false,
+			OutAllowZeroHop:   false,
+			InLength:          3,
+			OutLength:         3,
+			InQuantity:        2,
+			OutQuantity:       2,
+			InVariance:        1,
+			OutVariance:       1,
+			InBackupQuantity:  3,
+			OutBackupQuantity: 3,
+		},
+		SessionOptions: config.SessionOptions{
+			NickName:   "",
+			Style:      "STREAM",
+			SigType:    "EdDSA_SHA512_Ed25519",
+			InFromPort: "",
+			OutToPort:  "",
+			Protocol:   "",
+			UDPPort:    0,
+			SamHost:    "127.0.0.1",
+			SamPort:    "7656",
+			SamMin:     string(common.SAM31Version.String),
+			SamMax:     string(common.SAM33Version.String),
+		},
+		TransportOptions: config.TransportOptions{
+			UseCompression:     "true",
+			FastReceive:        "false",
+			MessageReliability: "none",
+			CloseIdleTimeout:   5 * time.Minute,
+			ReduceIdleQuantity: 1,
+			ReduceIdle:         false,
+			CloseIdle:          false,
+		},
+	}
+	for _, o := range opts {
+		if err := o(&config); err != nil {
+			return nil, err
+		}
+	}
+	return &config, nil
+}

config/leaseset.go

@@ -0,0 +1,83 @@
+package config
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/go-i2p/i2pkeys"
+	"github.com/sirupsen/logrus"
+)
+
+type EncryptedLeaseSetOptions struct {
+	EncryptLeaseSet           bool
+	LeaseSetKey               string
+	LeaseSetPrivateKey        string
+	LeaseSetPrivateSigningKey string
+	LeaseSetKeys              i2pkeys.I2PKeys
+	LeaseSetEncryption        string
+}
+
+// EncryptLease returns the lease set encryption setting in the form of "i2cp.encryptLeaseSet=true"
+func (f *EncryptedLeaseSetOptions) EncryptLease() string {
+	if f.EncryptLeaseSet {
+		log.Debug("Lease set encryption enabled")
+		return " i2cp.encryptLeaseSet=true "
+	}
+	log.Debug("Lease set encryption not enabled")
+	return ""
+}
+
+// LeaseSetEncryptionType returns the lease set encryption type in the form of "i2cp.leaseSetEncType=type"
+func (f *EncryptedLeaseSetOptions) LeaseSetEncryptionType() string {
+	if f.LeaseSetEncryption == "" {
+		log.Debug("Using default lease set encryption type: 4,0")
+		return "i2cp.leaseSetEncType=4,0"
+	}
+	for _, s := range strings.Split(f.LeaseSetEncryption, ",") {
+		if _, err := strconv.Atoi(s); err != nil {
+			log.WithField("invalidType", s).Panic("Invalid encrypted leaseSet type")
+			// panic("Invalid encrypted leaseSet type: " + s)
+		}
+	}
+	log.WithField("leaseSetEncType", f.LeaseSetEncryption).Debug("Lease set encryption type set")
+	return fmt.Sprintf(" i2cp.leaseSetEncType=%s ", f.LeaseSetEncryption)
+}
+
+func (f *EncryptedLeaseSetOptions) leaseSetKey() string {
+	if f.LeaseSetKey != "" {
+		return fmt.Sprintf(" i2cp.leaseSetKey=%s ", f.LeaseSetKey)
+	}
+	return ""
+}
+
+func (f *EncryptedLeaseSetOptions) leaseSetPrivateKey() string {
+	if f.LeaseSetPrivateKey != "" {
+		return fmt.Sprintf(" i2cp.leaseSetPrivateKey=%s ", f.LeaseSetPrivateKey)
+	}
+	return ""
+}
+
+func (f *EncryptedLeaseSetOptions) leaseSetPrivateSigningKey() string {
+	if f.LeaseSetPrivateSigningKey != "" {
+		return fmt.Sprintf(" i2cp.leaseSetPrivateSigningKey=%s ", f.LeaseSetPrivateSigningKey)
+	}
+	return ""
+}
+
+// Leasesetsettings returns the lease set settings in the form of "i2cp.leaseSetKey=key i2cp.leaseSetPrivateKey=key i2cp.leaseSetPrivateSigningKey=key"
+func (f *EncryptedLeaseSetOptions) Leasesetsettings() (string, string, string) {
+	if f.EncryptLeaseSet {
+		var r, s, t string
+		r = f.leaseSetKey()
+		s = f.leaseSetPrivateKey()
+		t = f.leaseSetPrivateSigningKey()
+		log.WithFields(logrus.Fields{
+			"leaseSetKey":               r,
+			"leaseSetPrivateKey":        s,
+			"leaseSetPrivateSigningKey": t,
+		}).Debug("Lease set settings constructed")
+		return r, s, t
+	}
+	return "", "", ""
+}

config/log.go

@@ -0,0 +1,5 @@
+package config
+
+import logger "github.com/go-i2p/sam3/log"
+
+var log = logger.GetSAM3Logger()

config/session.go

@@ -0,0 +1,84 @@
+package config
+
+import (
+	"fmt"
+	"strconv"
+
+	"github.com/go-i2p/sam3/common"
+)
+
+type SessionOptions struct {
+	NickName   string
+	Style      string
+	SigType    string
+	InFromPort string
+	OutToPort  string
+	Protocol   string
+	UDPPort    int
+	SamHost    string
+	SamPort    string
+	SamMin     string
+	SamMax     string
+}
+
+func (f *SessionOptions) samMax() float64 {
+	i, err := strconv.Atoi(f.SamMax)
+	if err != nil {
+		log.WithError(err).Warn("Failed to parse SamMax, using default 3.1")
+		return 3.1
+	}
+	log.WithField("samMax", float64(i)).Debug("SAM max version parsed")
+	return float64(i)
+}
+
+// SignatureType returns the signature type setting in the form of "SIGNATURE_TYPE=type"
+func (f *SessionOptions) SignatureType() string {
+	if f.samMax() < common.SAM31Version.Number {
+		log.Debug("SAM version < 3.1, SignatureType not applicable")
+		return ""
+	}
+	if f.SigType != "" {
+		log.WithField("sigType", f.SigType).Debug("Signature type set")
+		return fmt.Sprintf(" SIGNATURE_TYPE=%s ", f.SigType)
+	}
+	log.Debug("Signature type not set")
+	return ""
+}
+
+// FromPort returns the from port setting in the form of "FROM_PORT=port"
+func (f *SessionOptions) FromPort() string {
+	if f.samMax() < common.SAM31Version.Number {
+		log.Debug("SAM version < 3.1, FromPort not applicable")
+		return ""
+	}
+	if f.InFromPort != "0" {
+		log.WithField("fromPort", f.InFromPort).Debug("FromPort set")
+		return fmt.Sprintf(" FROM_PORT=%s ", f.InFromPort)
+	}
+	log.Debug("FromPort not set")
+	return ""
+}
+
+// ToPort returns the to port setting in the form of "TO_PORT=port"
+func (f *SessionOptions) ToPort() string {
+	if f.samMax() < common.SAM31Version.Number {
+		log.Debug("SAM version < 3.1, ToPort not applicable")
+		return ""
+	}
+	if f.OutToPort != "0" {
+		log.WithField("toPort", f.OutToPort).Debug("ToPort set")
+		return fmt.Sprintf(" TO_PORT=%s ", f.OutToPort)
+	}
+	log.Debug("ToPort not set")
+	return ""
+}
+
+// SessionStyle returns the session style setting in the form of "STYLE=style"
+func (f *SessionOptions) SessionStyle() string {
+	if f.Style != "" {
+		log.WithField("style", f.Style).Debug("Session style set")
+		return fmt.Sprintf(" STYLE=%s ", f.Style)
+	}
+	log.Debug("Using default STREAM style")
+	return " STYLE=STREAM "
+}

config/transport.go

@@ -0,0 +1,95 @@
+package config
+
+import (
+	"fmt"
+	"strconv"
+	"time"
+
+	"github.com/sirupsen/logrus"
+)
+
+func boolToStr(b bool) string {
+	if b {
+		return "true"
+	}
+	return "false"
+}
+
+// Add transport options
+type TransportOptions struct {
+	UseCompression     string
+	FastReceive        string
+	MessageReliability string
+	CloseIdleTimeout   time.Duration
+	CloseIdle          bool
+	ReduceIdleTimeout  time.Duration
+	ReduceIdle         bool
+	ReduceIdleQuantity int
+}
+
+func (f *TransportOptions) ReduceOnIdle() string {
+	return boolToStr(f.ReduceIdle)
+}
+
+func (f *TransportOptions) ReduceQuantity() string {
+	return strconv.Itoa(f.ReduceIdleQuantity)
+}
+
+func (f *TransportOptions) CloseOnIdle() string {
+	return boolToStr(f.CloseIdle)
+}
+
+func (f *TransportOptions) DoFastReceive() string {
+	if f.FastReceive == "true" {
+		log.Debug("Fast receive enabled")
+		return " i2cp.fastReceive=true "
+	}
+	log.Debug("Fast receive disabled")
+	return ""
+}
+
+// Reliability returns the message reliability setting in the form of "i2cp.messageReliability=reliability"
+func (f *TransportOptions) Reliability() string {
+	if f.MessageReliability != "" {
+		log.WithField("reliability", f.MessageReliability).Debug("Message reliability set")
+		return fmt.Sprintf(" i2cp.messageReliability=%s ", f.MessageReliability)
+	}
+	log.Debug("Message reliability not set")
+	return ""
+}
+
+// Reduce returns the reduce idle settings in the form of "i2cp.reduceOnIdle=true i2cp.reduceIdleTime=time i2cp.reduceQuantity=quantity"
+func (f *TransportOptions) Reduce() string {
+	if f.ReduceIdle {
+		log.WithFields(logrus.Fields{
+			"reduceIdle":         f.ReduceIdle,
+			"reduceIdleTime":     f.ReduceIdleTimeout.String(),
+			"reduceIdleQuantity": f.ReduceIdleQuantity,
+		}).Debug("Reduce idle settings applied")
+		return fmt.Sprintf(" i2cp.reduceOnIdle=%s i2cp.reduceIdleTime=%s i2cp.reduceQuantity=%d ", f.ReduceOnIdle(), f.ReduceIdleTimeout.String(), f.ReduceIdleQuantity)
+	}
+	log.Debug("Reduce idle settings not applied")
+	return ""
+}
+
+// Close returns the close idle settings in the form of "i2cp.closeOnIdle=true i2cp.closeIdleTime=time"
+func (f *TransportOptions) Close() string {
+	if f.CloseIdle {
+		log.WithFields(logrus.Fields{
+			"closeIdle":     f.CloseIdle,
+			"closeIdleTime": f.CloseIdleTimeout.String(),
+		}).Debug("Close idle settings applied")
+		return fmt.Sprintf(" i2cp.closeOnIdle=%s i2cp.closeIdleTime=%s  ", f.CloseOnIdle(), f.CloseIdleTimeout.String())
+	}
+	log.Debug("Close idle settings not applied")
+	return ""
+}
+
+func (f *TransportOptions) UsesCompression() string {
+	if f.UseCompression == "true" {
+		log.Debug("Compression enabled")
+		return " i2cp.useCompression=true "
+	}
+	log.Debug("Compression disabled")
+	return ""
+}

config/tunnel.go

@@ -0,0 +1,69 @@
+package config
+
+import (
+	"fmt"
+	"strconv"
+)
+
+type TunnelOptions struct {
+	InAllowZeroHop    bool
+	OutAllowZeroHop   bool
+	InLength          int
+	OutLength         int
+	InQuantity        int
+	OutQuantity       int
+	InVariance        int
+	OutVariance       int
+	InBackupQuantity  int
+	OutBackupQuantity int
+}
+
+func (f *TunnelOptions) InboundDoZero() string {
+	val := boolToStr(f.InAllowZeroHop)
+	return fmt.Sprintf(" inbound.allowZeroHop=%s ", val)
+}
+
+func (f *TunnelOptions) OutboundDoZero() string {
+	val := boolToStr(f.OutAllowZeroHop)
+	return fmt.Sprintf(" outbound.allowZeroHop=%s ", val)
+}
+
+func (f *TunnelOptions) InboundLength() string {
+	val := strconv.Itoa(f.InLength)
+	return fmt.Sprintf(" inbound.length=%s ", val)
+}
+
+func (f *TunnelOptions) OutboundLength() string {
+	val := strconv.Itoa(f.OutLength)
+	return fmt.Sprintf(" outbound.length=%s ", val)
+}
+
+func (f *TunnelOptions) InboundQuantity() string {
+	val := strconv.Itoa(f.InQuantity)
+	return fmt.Sprintf(" inbound.quantity=%s ", val)
+}
+
+func (f *TunnelOptions) OutboundQuantity() string {
+	val := strconv.Itoa(f.OutQuantity)
+	return fmt.Sprintf(" outbound.quantity=%s ", val)
+}
+
+func (f *TunnelOptions) InboundVariance() string {
+	val := strconv.Itoa(f.InVariance)
+	return fmt.Sprintf(" inbound.variance=%s ", val)
+}
+
+func (f *TunnelOptions) OutboundVariance() string {
+	val := strconv.Itoa(f.OutVariance)
+	return fmt.Sprintf(" outbound.variance=%s ", val)
+}
+
+func (f *TunnelOptions) InboundBackupQuantity() string {
+	val := strconv.Itoa(f.InBackupQuantity)
+	return fmt.Sprintf(" inbound.backupQuantity=%s ", val)
+}
+
+func (f *TunnelOptions) OutboundBackupQuantity() string {
+	val := strconv.Itoa(f.OutBackupQuantity)
+	return fmt.Sprintf(" outbound.backupQuantity=%s ", val)
+}

datagram.go

@@ -3,139 +3,375 @@ package sam3
 import (
 	"bytes"
 	"errors"
+	"fmt"
 	"net"
-	"strconv"
+	"sync"
 	"time"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/go-i2p/i2pkeys"
+	"github.com/go-i2p/sam3/common"
 )
 
 // The DatagramSession implements net.PacketConn. It works almost like ordinary
 // UDP, except that datagrams may be at most 31kB large. These datagrams are
-// also end-to-end encrypted, signed and includes replay-protection. And they 
+// also end-to-end encrypted, signed and includes replay-protection. And they
 // are also built to be surveillance-resistant (yey!).
 type DatagramSession struct {
-    samAddr     string             // address to the sam bridge (ipv4:port)
+	samAddr    string           // address to the sam bridge (ipv4:port)
-	id          string             // tunnel name
+	id         string           // tunnel name
-	conn        net.Conn           // connection to sam bridge
+	conn       net.Conn         // connection to sam bridge
-	udpconn     *net.UDPConn       // used to deliver datagrams
+	keys       i2pkeys.I2PKeys  // i2p destination keys
-	keys        I2PKeys            // i2p destination keys
+	remoteAddr *i2pkeys.I2PAddr // optional remote I2P address
-	rUDPAddr    *net.UDPAddr       // the SAM bridge UDP-port
+	common.UDPSession
+	*DatagramOptions
 }
 
-// Creates a new datagram session. udpPort is the UDP port SAM is listening on, 
+// Creates a new datagram session. udpPort is the UDP port SAM is listening on,
 // and if you set it to zero, it will use SAMs standard UDP port.
-func (s *SAM) NewDatagramSession(id string, keys I2PKeys, options []string, udpPort int) (*DatagramSession, error) {
+func (s *SAM) NewDatagramSession(id string, keys i2pkeys.I2PKeys, options []string, udpPort int, datagramOptions ...DatagramOptions) (*DatagramSession, error) {
-	if udpPort > 65335 || udpPort < 0 {
+	log.WithFields(logrus.Fields{
-		return nil, errors.New("udpPort needs to be in the intervall 0-65335")
+		"id":      id,
+		"udpPort": udpPort,
+	}).Debug("Creating new DatagramSession")
+	udpSessionConfig := &common.UDPSessionConfig{
+		Port:          udpPort,
+		ParentConn:    s.conn,
+		Log:           log,
+		DefaultPort:   7655,
+		AllowZeroPort: true,
+		// Add required session parameters
+		Style:        "DATAGRAM",
+		FromPort:     "0", // Allow dynamic port assignment
+		ToPort:       "0",
+		ReadTimeout:  30 * time.Second,
+		WriteTimeout: 30 * time.Second,
 	}
-	if udpPort == 0 {
+	udpconn, err := common.NewUDPSession(udpSessionConfig)
-		udpPort = 7655
-	}
-	lhost, _, err := net.SplitHostPort(s.conn.LocalAddr().String())
 	if err != nil {
+		log.WithError(err).Error("Failed to create UDP session")
+		return nil, err
+	}
+	_, lport, err := net.SplitHostPort(udpconn.Conn.LocalAddr().String())
+	if err != nil {
+		log.WithError(err).Error("Failed to get local port")
 		s.Close()
 		return nil, err
 	}
-	lUDPAddr, err := net.ResolveUDPAddr("udp4", lhost + ":0")
+	conn, err := s.newGenericSession("DATAGRAM", id, keys, options, []string{" PORT=" + lport})
 	if err != nil {
+		log.WithError(err).Error("Failed to create generic session")
 		return nil, err
 	}
-	udpconn, err := net.ListenUDP("udp4", lUDPAddr)
+	if len(datagramOptions) > 0 {
-	if err != nil {
+		return &DatagramSession{
-		return nil, err
+			samAddr:         s.address,
+			id:              id,
+			conn:            conn,
+			keys:            keys,
+			UDPSession:      *udpconn,
+			DatagramOptions: &datagramOptions[0],
+		}, nil
 	}
-	rhost, _, err := net.SplitHostPort(s.conn.RemoteAddr().String())
+	log.WithField("id", id).Info("DatagramSession created successfully")
-	if err != nil {
+	//	return &DatagramSession{s.address, id, conn, udpconn, keys, rUDPAddr, nil, nil}, nil
-		s.Close()
+	return &DatagramSession{
-		return nil, err
+		samAddr:    s.address,
-	}
+		id:         id,
-	rUDPAddr, err := net.ResolveUDPAddr("udp4", rhost + ":" + strconv.Itoa(udpPort))
+		conn:       conn,
-	if err != nil {
+		keys:       keys,
-		return nil, err
+		UDPSession: *udpconn,
-	}
+	}, nil
-	_, lport, err := net.SplitHostPort(udpconn.LocalAddr().String())
-	conn, err := s.newGenericSession("DATAGRAM", id, keys, options, []string{"PORT=" + lport})
-	if err != nil {
-		return nil, err
-	}
-	return &DatagramSession{s.address, id, conn, udpconn, keys, rUDPAddr}, nil
 }
 
-// Reads one datagram sent to the destination of the DatagramSession. Returns 
+func (s *DatagramSession) B32() string {
+	b32 := s.keys.Addr().Base32()
+	log.WithField("b32", b32).Debug("Generated B32 address")
+	return b32
+}
+
+func (s *DatagramSession) Dial(net, addr string) (*DatagramSession, error) {
+	log.WithFields(logrus.Fields{
+		"net":  net,
+		"addr": addr,
+	}).Debug("Dialing address")
+	netaddr, err := s.Lookup(addr)
+	if err != nil {
+		log.WithError(err).Error("Lookup failed")
+		return nil, err
+	}
+	return s.DialI2PRemote(net, netaddr)
+}
+
+func (s *DatagramSession) DialRemote(net, addr string) (net.PacketConn, error) {
+	log.WithFields(logrus.Fields{
+		"net":  net,
+		"addr": addr,
+	}).Debug("Dialing remote address")
+	netaddr, err := s.Lookup(addr)
+	if err != nil {
+		log.WithError(err).Error("Lookup failed")
+		return nil, err
+	}
+	return s.DialI2PRemote(net, netaddr)
+}
+
+func (s *DatagramSession) DialI2PRemote(net string, addr net.Addr) (*DatagramSession, error) {
+	log.WithFields(logrus.Fields{
+		"net":  net,
+		"addr": addr,
+	}).Debug("Dialing I2P remote address")
+	switch addr.(type) {
+	case *i2pkeys.I2PAddr:
+		s.remoteAddr = addr.(*i2pkeys.I2PAddr)
+	case i2pkeys.I2PAddr:
+		i2paddr := addr.(i2pkeys.I2PAddr)
+		s.remoteAddr = &i2paddr
+	}
+	return s, nil
+}
+
+func (s *DatagramSession) RemoteAddr() net.Addr {
+	log.WithField("remoteAddr", s.remoteAddr).Debug("Getting remote address")
+	return s.remoteAddr
+}
+
+// Reads one datagram sent to the destination of the DatagramSession. Returns
 // the number of bytes read, from what address it was sent, or an error.
-func (s *DatagramSession) ReadFrom(b []byte) (n int, addr I2PAddr, err error) {
+// implements net.PacketConn
-	// extra bytes to read the remote address of incomming datagram
+func (s *DatagramSession) ReadFrom(b []byte) (n int, addr net.Addr, err error) {
-	buf := make([]byte, len(b) + 4096)
+	log.Debug("Reading datagram")
-	
+	// Use sync.Pool for buffers
+	bufPool := sync.Pool{
+		New: func() interface{} {
+			return make([]byte, len(b)+4096)
+		},
+	}
+	buf := bufPool.Get().([]byte)
+	defer bufPool.Put(buf)
+
 	for {
 		// very basic protection: only accept incomming UDP messages from the IP of the SAM bridge
 		var saddr *net.UDPAddr
-		n, saddr, err = s.udpconn.ReadFromUDP(buf)
+		n, saddr, err = s.UDPSession.Conn.ReadFromUDP(buf)
 		if err != nil {
-			return 0, I2PAddr(""), err
+			log.WithError(err).Error("Failed to read from UDP")
+			return 0, i2pkeys.I2PAddr(""), err
 		}
-		if bytes.Equal(saddr.IP, s.rUDPAddr.IP) {
+		if bytes.Equal(saddr.IP, s.UDPSession.RemoteAddr.IP) {
 			continue
 		}
 		break
 	}
-	i := bytes.IndexByte(buf, byte('\n'))
+	i := bytes.IndexByte(buf, byte(' '))
 	if i > 4096 || i > n {
-		return 0, I2PAddr(""), errors.New("Could not parse incomming message remote address.")
+		log.Error("Could not parse incoming message remote address")
+		return 0, i2pkeys.I2PAddr(""), errors.New("Could not parse incomming message remote address.")
 	}
-	raddr, err := NewI2PAddrFromString(string(buf[:i]))
+	raddr, err := i2pkeys.NewI2PAddrFromString(string(buf[:i]))
 	if err != nil {
-		return 0, I2PAddr(""), errors.New("Could not parse incomming message remote address: " + err.Error())
+		log.WithError(err).Error("Could not parse incoming message remote address")
+		return 0, i2pkeys.I2PAddr(""), errors.New("Could not parse incomming message remote address: " + err.Error())
 	}
 	// shift out the incomming address to contain only the data received
-	if ( n - i+1 ) > len(b) {
+	if (n - i + 1) > len(b) {
 		copy(b, buf[i+1:i+1+len(b)])
-		return n-(i+1), raddr, errors.New("Datagram did not fit into your buffer.")
+		return n - (i + 1), raddr, errors.New("Datagram did not fit into your buffer.")
 	} else {
 		copy(b, buf[i+1:n])
-		return n-(i+1), raddr, nil
+		log.WithField("bytesRead", n-(i+1)).Debug("Datagram read successfully")
+		return n - (i + 1), raddr, nil
 	}
 }
 
-// Sends one signed datagram to the destination specified. At the time of 
+func (s *DatagramSession) Accept() (net.Conn, error) {
+	log.Debug("Accept called on DatagramSession")
+	return s, nil
+}
+
+func (s *DatagramSession) Read(b []byte) (n int, err error) {
+	log.Debug("Reading from DatagramSession")
+	rint, _, rerr := s.ReadFrom(b)
+	return rint, rerr
+}
+
+const (
+	MAX_DATAGRAM_SIZE = 31744 // Max reliable size
+	RECOMMENDED_SIZE  = 11264 // 11KB recommended max
+)
+
+// Sends one signed datagram to the destination specified. At the time of
 // writing, maximum size is 31 kilobyte, but this may change in the future.
 // Implements net.PacketConn.
-func (s *DatagramSession) WriteTo(b []byte, addr I2PAddr) (n int, err error) {
+func (s *DatagramSession) WriteTo(b []byte, addr net.Addr) (n int, err error) {
-	header := []byte("3.0 " + s.id + " " + addr.String() + "\n")
+	log.WithFields(logrus.Fields{
+		"addr":        addr,
+		"datagramLen": len(b),
+	}).Debug("Writing datagram")
+
+	if len(b) > MAX_DATAGRAM_SIZE {
+		return 0, errors.New("datagram exceeds maximum size")
+	}
+
+	// Use chunking for anything above recommended size
+	if len(b) > RECOMMENDED_SIZE {
+		return s.writeChunked(b, addr)
+	}
+
+	// Single message path
+	if s.DatagramOptions != nil {
+		return s.writeToWithOptions(b, addr.(i2pkeys.I2PAddr))
+	}
+	header := []byte(fmt.Sprintf("3.1 %s %s\n", s.id, addr.(i2pkeys.I2PAddr).String()))
 	msg := append(header, b...)
-	n, err = s.udpconn.WriteToUDP(msg, s.rUDPAddr)
+	n, err = s.UDPSession.Conn.WriteToUDP(msg, s.UDPSession.RemoteAddr)
+	if err != nil {
+		log.WithError(err).Error("Failed to write to UDP")
+	} else {
+		log.WithField("bytesWritten", n).Debug("Datagram written successfully")
+	}
 	return n, err
 }
 
+func (s *DatagramSession) writeChunked(b []byte, addr net.Addr) (total int, err error) {
+	chunkSize := RECOMMENDED_SIZE - 256 // Allow for header overhead
+	chunks := (len(b) + chunkSize - 1) / chunkSize
+
+	log.WithFields(logrus.Fields{
+		"totalSize": len(b),
+		"chunks":    chunks,
+	}).Debug("Splitting datagram into chunks")
+
+	for i := 0; i < chunks; i++ {
+		start := i * chunkSize
+		end := start + chunkSize
+		if end > len(b) {
+			end = len(b)
+		}
+
+		chunk := b[start:end]
+		var n int
+
+		// Single write path that handles both cases
+		if s.DatagramOptions != nil {
+			n, err = s.writeToWithOptions(chunk, addr.(i2pkeys.I2PAddr))
+		} else {
+			header := []byte(fmt.Sprintf("3.1 %s %s %d %d\n", s.id, addr.(i2pkeys.I2PAddr).String(), i, chunks))
+			msg := append(header, chunk...)
+			n, err = s.UDPSession.Conn.WriteToUDP(msg, s.UDPSession.RemoteAddr)
+		}
+
+		if err != nil {
+			return total, fmt.Errorf("chunk %d/%d failed: %w", i+1, chunks, err)
+		}
+		total += n
+
+		if i < chunks-1 {
+			time.Sleep(50 * time.Millisecond)
+		}
+	}
+
+	return total, nil
+}
+
+type DatagramOptions struct {
+	SendTags     int
+	TagThreshold int
+	Expires      int
+	SendLeaseset bool
+}
+
+func (s *DatagramSession) writeToWithOptions(b []byte, addr i2pkeys.I2PAddr) (n int, err error) {
+	header := []byte(fmt.Sprintf("3.3 %s %s", s.id, addr.String()))
+	if s.DatagramOptions != nil {
+		if s.DatagramOptions.SendTags > 0 {
+			header = append(header, []byte(fmt.Sprintf(" SEND_TAGS=%d", s.DatagramOptions.SendTags))...)
+		}
+		if s.DatagramOptions.TagThreshold > 0 {
+			header = append(header, []byte(fmt.Sprintf(" TAG_THRESHOLD=%d", s.DatagramOptions.TagThreshold))...)
+		}
+		if s.DatagramOptions.Expires > 0 {
+			header = append(header, []byte(fmt.Sprintf(" EXPIRES=%d", s.DatagramOptions.Expires))...)
+		}
+		if s.DatagramOptions.SendLeaseset {
+			header = append(header, []byte(" SEND_LEASESET=true")...)
+		}
+	}
+	header = append(header, '\n')
+	msg := append(header, b...)
+	return s.UDPSession.Conn.WriteToUDP(msg, s.UDPSession.RemoteAddr)
+}
+
+func (s *DatagramSession) Write(b []byte) (int, error) {
+	log.WithField("dataLen", len(b)).Debug("Writing to DatagramSession")
+	return s.WriteTo(b, s.remoteAddr)
+}
+
 // Closes the DatagramSession. Implements net.PacketConn
 func (s *DatagramSession) Close() error {
+	log.Debug("Closing DatagramSession")
 	err := s.conn.Close()
-	err2 := s.udpconn.Close()
+	err2 := s.UDPSession.Conn.Close()
 	if err != nil {
+		log.WithError(err).Error("Failed to close connection")
 		return err
 	}
+	if err2 != nil {
+		log.WithError(err2).Error("Failed to close UDP connection")
+	}
 	return err2
 }
 
-// Returns the I2P destination of the DatagramSession. Implements net.PacketConn
+// Returns the I2P destination of the DatagramSession.
-func (s *DatagramSession) LocalAddr() I2PAddr {
+func (s *DatagramSession) LocalI2PAddr() i2pkeys.I2PAddr {
-	return s.keys.Addr()
+	addr := s.keys.Addr()
+	log.WithField("localI2PAddr", addr).Debug("Getting local I2P address")
+	return addr
 }
 
-// Sets read and write deadlines for the DatagramSession. Implements 
+// Implements net.PacketConn
+func (s *DatagramSession) LocalAddr() net.Addr {
+	return s.LocalI2PAddr()
+}
+
+func (s *DatagramSession) Addr() net.Addr {
+	return s.LocalI2PAddr()
+}
+
+func (s *DatagramSession) Lookup(name string) (a net.Addr, err error) {
+	log.WithField("name", name).Debug("Looking up address")
+	var sam *SAM
+	sam, err = NewSAM(s.samAddr)
+	if err == nil {
+		defer sam.Close()
+		a, err = sam.Lookup(name)
+	}
+	log.WithField("address", a).Debug("Lookup successful")
+	return
+}
+
+// Sets read and write deadlines for the DatagramSession. Implements
 // net.PacketConn and does the same thing. Setting write deadlines for datagrams
 // is seldom done.
 func (s *DatagramSession) SetDeadline(t time.Time) error {
-	return s.udpconn.SetDeadline(t)
+	log.WithField("deadline", t).Debug("Setting deadline")
+	return s.UDPSession.Conn.SetDeadline(t)
 }
 
 // Sets read deadline for the DatagramSession. Implements net.PacketConn
 func (s *DatagramSession) SetReadDeadline(t time.Time) error {
-	return s.udpconn.SetReadDeadline(t)
+	log.WithField("readDeadline", t).Debug("Setting read deadline")
+	return s.UDPSession.Conn.SetReadDeadline(t)
 }
 
 // Sets the write deadline for the DatagramSession. Implements net.Packetconn.
 func (s *DatagramSession) SetWriteDeadline(t time.Time) error {
-	return s.udpconn.SetWriteDeadline(t)
+	log.WithField("writeDeadline", t).Debug("Setting write deadline")
+	return s.UDPSession.Conn.SetWriteDeadline(t)
 }
 
-
+func (s *DatagramSession) SetWriteBuffer(bytes int) error {
+	log.WithField("bytes", bytes).Debug("Setting write buffer")
+	return s.UDPSession.Conn.SetWriteBuffer(bytes)
+}

datagram_test.go

@@ -4,8 +4,9 @@ import (
 	"fmt"
 	"testing"
 	"time"
-)
 
+	sam3opts "github.com/go-i2p/sam3/opts"
+)
 
 func Test_DatagramServerClient(t *testing.T) {
 	if testing.Short() {
@@ -24,7 +25,7 @@ func Test_DatagramServerClient(t *testing.T) {
 		t.Fail()
 		return
 	}
-//	fmt.Println("\tServer: My address: " + keys.Addr().Base32())
+	//	fmt.Println("\tServer: My address: " + keys.Addr().Base32())
 	fmt.Println("\tServer: Creating tunnel")
 	ds, err := sam.NewDatagramSession("DGserverTun", keys, []string{"inbound.length=0", "outbound.length=0", "inbound.lengthVariance=0", "outbound.lengthVariance=0", "inbound.quantity=1", "outbound.quantity=1"}, 0)
 	if err != nil {
@@ -33,7 +34,7 @@ func Test_DatagramServerClient(t *testing.T) {
 		return
 	}
 	c, w := make(chan bool), make(chan bool)
-	go func(c, w chan(bool)) { 
+	go func(c, w chan (bool)) {
 		sam2, err := NewSAM(yoursam)
 		if err != nil {
 			c <- false
@@ -52,22 +53,22 @@ func Test_DatagramServerClient(t *testing.T) {
 			return
 		}
 		defer ds2.Close()
-//		fmt.Println("\tClient: Servers address: " + ds.LocalAddr().Base32())
+		//		fmt.Println("\tClient: Servers address: " + ds.LocalAddr().Base32())
-//		fmt.Println("\tClient: Clients address: " + ds2.LocalAddr().Base32())
+		//		fmt.Println("\tClient: Clients address: " + ds2.LocalAddr().Base32())
 		fmt.Println("\tClient: Tries to send datagram to server")
 		for {
 			select {
-				default :
+			default:
-					_, err = ds2.WriteTo([]byte("Hello datagram-world! <3 <3 <3 <3 <3 <3"), ds.LocalAddr())
+				_, err = ds2.WriteTo([]byte("Hello datagram-world! <3 <3 <3 <3 <3 <3"), ds.LocalAddr())
-					if err != nil {
+				if err != nil {
-						fmt.Println("\tClient: Failed to send datagram: " + err.Error())
+					fmt.Println("\tClient: Failed to send datagram: " + err.Error())
-						c <- false
+					c <- false
-						return
-					}
-					time.Sleep(5 * time.Second)
-				case <-w :
-					fmt.Println("\tClient: Sent datagram, quitting.")
 					return
+				}
+				time.Sleep(5 * time.Second)
+			case <-w:
+				fmt.Println("\tClient: Sent datagram, quitting.")
+				return
 			}
 		}
 		c <- true
@@ -82,19 +83,14 @@ func Test_DatagramServerClient(t *testing.T) {
 		return
 	}
 	fmt.Println("\tServer: Received datagram: " + string(buf[:n]))
-//	fmt.Println("\tServer: Senders address was: " + saddr.Base32())
+	//	fmt.Println("\tServer: Senders address was: " + saddr.Base32())
 }
 
-
-
-
-
-
 func ExampleDatagramSession() {
 	// Creates a new DatagramSession, which behaves just like a net.PacketConn.
-	
+
 	const samBridge = "127.0.0.1:7656"
-	
+
 	sam, err := NewSAM(samBridge)
 	if err != nil {
 		fmt.Println(err.Error())
@@ -108,7 +104,7 @@ func ExampleDatagramSession() {
 	myself := keys.Addr()
 
 	// See the example Option_* variables.
-	dg, err := sam.NewDatagramSession("DGTUN", keys, Options_Small, 0)
+	dg, err := sam.NewDatagramSession("DGTUN", keys, sam3opts.Options_Small, 0)
 	if err != nil {
 		fmt.Println(err.Error())
 		return
@@ -128,10 +124,61 @@ func ExampleDatagramSession() {
 		fmt.Println(err.Error())
 		return
 	}
+	fmt.Println("Got message: '" + string(buf[:n]) + "'")
 	fmt.Println("Got message: " + string(buf[:n]))
 
 	return
 	// Output:
-	//Got message: Hello myself!
+	// Got message: Hello myself!
 }
 
+func ExampleMiniDatagramSession() {
+	// Creates a new DatagramSession, which behaves just like a net.PacketConn.
+
+	const samBridge = "127.0.0.1:7656"
+
+	sam, err := NewSAM(samBridge)
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	keys, err := sam.NewKeys()
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	myself := keys.Addr()
+
+	// See the example Option_* variables.
+	dg, err := sam.NewDatagramSession("MINIDGTUN", keys, sam3opts.Options_Small, 0)
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	someone, err := sam.Lookup("zzz.i2p")
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	err = dg.SetWriteBuffer(14 * 1024)
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+
+	dg.WriteTo([]byte("Hello stranger!"), someone)
+	dg.WriteTo([]byte("Hello myself!"), myself)
+
+	buf := make([]byte, 31*1024)
+	n, _, err := dg.ReadFrom(buf)
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	log.Println("Got message: '" + string(buf[:n]) + "'")
+	fmt.Println("Got message: " + string(buf[:n]))
+
+	return
+	// Output:
+	// Got message: Hello myself!
+}

debian/changelog

@@ -0,0 +1,59 @@
+golang-github-eyedeekay-sam3 (0.3.2.32) unreleased; urgency=medium
+
+  [ idk ]
+  * Include "Convenience Functions" in /helper
+
+ -- idk <hankhill19580@gmail.com>  Sun, 22 Nov 2020 12:49:13 -0500
+
+golang-github-eyedeekay-sam3 (0.3.2.31) unreleased; urgency=medium
+
+  [ idk ]
+  * Incorporate address fix from qiwenmin
+  * Shortcut for saving keys to text file
+
+ -- idk <hankhill19580@gmail.com>  Sun, 18 Oct 2020 1:01:03 -0500
+
+golang-github-eyedeekay-sam3 (0.3.2.3) unreleased; urgency=medium
+
+  [ idk ]
+  * Purge ramp, re-release
+
+ -- idk <hankhill19580@gmail.com>  Mon, 22 Jun 2020 17:55:03 -0500
+
+golang-github-eyedeekay-sam3 (0.3.2.2) bionic; urgency=medium
+
+  [ idk ]
+  * Purge ramp
+
+ -- idk <hankhill19580@gmail.com>  Sat, 7 Dec 2019 22:05:34 -0500
+
+
+golang-github-eyedeekay-sam3 (0.3.2.1) bionic; urgency=medium
+
+  [ idk ]
+  * Add support for 44-character destination hashes.
+
+ -- idk <hankhill19580@gmail.com>  Sat, 7 Dec 2019 17:30:30 -0500
+
+
+golang-github-eyedeekay-sam3 (0.3.2.01) bionic; urgency=medium
+
+  [ idk ]
+  * completely remove the old i2pkeys version and replace it with the new one.
+
+ -- idk <hankhill19580@gmail.com>  Sat, 25 May 2019 14:38:11 -0500
+
+golang-github-eyedeekay-sam3 (0.3.2.0) bionic; urgency=medium
+
+  [ idk ]
+  * Bug fixes, create stable branch
+  * Move i2pkeys
+
+ -- idk <hankhill19580@gmail.com>  Sat, 18 May 2019 18:32:51 -0500
+
+golang-github-eyedeekay-sam3 (0.0~git20190223.af5a3f3) bionic; urgency=medium
+
+  [ idk ]
+  * Initial release (Closes: TODO)
+
+ -- idk <hankhill19580@gmail.com>  Thu, 28 Feb 2019 21:40:35 -0500

debian/compat

@@ -0,0 +1 @@
+11

debian/control

@@ -0,0 +1,25 @@
+Source: golang-github-eyedeekay-sam3
+Section: devel
+Priority: optional
+Maintainer: Debian Go Packaging Team <team+pkg-go@tracker.debian.org>
+Uploaders: idk <hankhill19580@gmail.com>
+Build-Depends: debhelper (>= 11),
+               dh-golang,
+               git,
+               golang-any | golang-go,
+Standards-Version: 4.2.1
+Homepage: https://github.com/eyedeekay/sam3
+Vcs-Browser: https://github.com/eyedeekay/sam3
+Vcs-Git: https://github.com/eyedeekay/sam3.git
+XS-Go-Import-Path: github.com/eyedeekay/sam3
+Testsuite: autopkgtest-pkg-go
+
+Package: golang-github-eyedeekay-sam3-dev
+Architecture: all
+Depends: ${misc:Depends},
+    i2p | i2pd
+Description: Go library for the I2P SAMv3.0 bridge,
+ used to build anonymous/pseudonymous end-to-end encrypted sockets.
+ README go library for the I2P SAMv3.0
+ (https://geti2p.net/en/docs/api/samv3) bridge, used to build
+ anonymous/pseudonymous end-to-end encrypted sockets.

debian/copyright

@@ -0,0 +1,17 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: sam3
+Source: https://github.com/eyedeekay/sam3
+Files-Excluded:
+  Godeps/_workspace
+
+Files: *
+Copyright: 2016 idk
+License: TODO
+
+Files: debian/*
+Copyright: 2019 idk <hankhill19580@gmail.com>
+License: TODO
+Comment: Debian packaging is licensed under the same terms as upstream
+
+License: TODO
+TODO

debian/files

@@ -0,0 +1 @@
+golang-github-eyedeekay-sam3_0.3.2.32_source.buildinfo devel optional

debian/gbp.conf

@@ -0,0 +1,2 @@
+[DEFAULT]
+pristine-tar = True

debian/rules

@@ -0,0 +1,4 @@
+#!/usr/bin/make -f
+
+%:
+	dh $@ --buildsystem=golang --with=golang

debian/source/format

@@ -0,0 +1 @@
+3.0 (native)

debian/watch

@@ -0,0 +1,4 @@
+version=4
+opts=filenamemangle=s/.+\/v?(\d\S*)\.tar\.gz/golang-github-eyedeekay-sam3-\$1\.tar\.gz/,\
+uversionmangle=s/(\d)[_\.\-\+]?(RC|rc|pre|dev|beta|alpha)[.]?(\d*)$/\$1~\$2\$3/ \
+  https://github.com/eyedeekay/sam3/tags .*/v?(\d\S*)\.tar\.gz

emit-options.go

@@ -0,0 +1,414 @@
+package sam3
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/sirupsen/logrus"
+)
+
+// Option is a SAMEmit Option
+type Option func(*SAMEmit) error
+
+// SetType sets the type of the forwarder server
+func SetType(s string) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		if s == "STREAM" {
+			c.Style = s
+			log.WithField("style", s).Debug("Set session style")
+			return nil
+		} else if s == "DATAGRAM" {
+			c.Style = s
+			log.WithField("style", s).Debug("Set session style")
+			return nil
+		} else if s == "RAW" {
+			c.Style = s
+			log.WithField("style", s).Debug("Set session style")
+			return nil
+		}
+		log.WithField("style", s).Error("Invalid session style")
+		return fmt.Errorf("Invalid session STYLE=%s, must be STREAM, DATAGRAM, or RAW", s)
+	}
+}
+
+// SetSAMAddress sets the SAM address all-at-once
+func SetSAMAddress(s string) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		sp := strings.Split(s, ":")
+		if len(sp) > 2 {
+			log.WithField("address", s).Error("Invalid SAM address")
+			return fmt.Errorf("Invalid address string: %s", sp)
+		}
+		if len(sp) == 2 {
+			c.I2PConfig.SamPort = sp[1]
+		}
+		c.I2PConfig.SamHost = sp[0]
+		log.WithFields(logrus.Fields{
+			"host": c.I2PConfig.SamHost,
+			"port": c.I2PConfig.SamPort,
+		}).Debug("Set SAM address")
+		return nil
+	}
+}
+
+// SetSAMHost sets the host of the SAMEmit's SAM bridge
+func SetSAMHost(s string) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.SamHost = s
+		log.WithField("host", s).Debug("Set SAM host")
+		return nil
+	}
+}
+
+// SetSAMPort sets the port of the SAMEmit's SAM bridge using a string
+func SetSAMPort(s string) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		port, err := strconv.Atoi(s)
+		if err != nil {
+			log.WithField("port", s).Error("Invalid SAM port: non-number")
+			return fmt.Errorf("Invalid SAM Port %s; non-number", s)
+		}
+		if port < 65536 && port > -1 {
+			c.I2PConfig.SamPort = s
+			log.WithField("port", s).Debug("Set SAM port")
+			return nil
+		}
+		log.WithField("port", port).Error("Invalid SAM port")
+		return fmt.Errorf("Invalid port")
+	}
+}
+
+// SetName sets the host of the SAMEmit's SAM bridge
+func SetName(s string) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.SessionOptions.NickName = s
+		log.WithField("name", s).Debug("Set tunnel name")
+		return nil
+	}
+}
+
+// SetInLength sets the number of hops inbound
+func SetInLength(u int) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		if u < 7 && u >= 0 {
+			c.I2PConfig.InLength = u
+			log.WithField("inLength", u).Debug("Set inbound tunnel length")
+			return nil
+		}
+		log.WithField("inLength", u).Error("Invalid inbound tunnel length")
+		return fmt.Errorf("Invalid inbound tunnel length")
+	}
+}
+
+// SetOutLength sets the number of hops outbound
+func SetOutLength(u int) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		if u < 7 && u >= 0 {
+			c.I2PConfig.OutLength = u
+			log.WithField("outLength", u).Debug("Set outbound tunnel length")
+			return nil
+		}
+		log.WithField("outLength", u).Error("Invalid outbound tunnel length")
+		return fmt.Errorf("Invalid outbound tunnel length")
+	}
+}
+
+// SetInVariance sets the variance of a number of hops inbound
+func SetInVariance(i int) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		if i < 7 && i > -7 {
+			c.I2PConfig.InVariance = i
+			log.WithField("inVariance", i).Debug("Set inbound tunnel variance")
+			return nil
+		}
+		log.WithField("inVariance", i).Error("Invalid inbound tunnel variance")
+		return fmt.Errorf("Invalid inbound tunnel length")
+	}
+}
+
+// SetOutVariance sets the variance of a number of hops outbound
+func SetOutVariance(i int) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		if i < 7 && i > -7 {
+			c.I2PConfig.OutVariance = i
+			log.WithField("outVariance", i).Debug("Set outbound tunnel variance")
+			return nil
+		}
+		log.WithField("outVariance", i).Error("Invalid outbound tunnel variance")
+		return fmt.Errorf("Invalid outbound tunnel variance")
+	}
+}
+
+// SetInQuantity sets the inbound tunnel quantity
+func SetInQuantity(u int) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		if u <= 16 && u > 0 {
+			c.I2PConfig.InQuantity = u
+			log.WithField("inQuantity", u).Debug("Set inbound tunnel quantity")
+			return nil
+		}
+		log.WithField("inQuantity", u).Error("Invalid inbound tunnel quantity")
+		return fmt.Errorf("Invalid inbound tunnel quantity")
+	}
+}
+
+// SetOutQuantity sets the outbound tunnel quantity
+func SetOutQuantity(u int) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		if u <= 16 && u > 0 {
+			c.I2PConfig.OutQuantity = u
+			log.WithField("outQuantity", u).Debug("Set outbound tunnel quantity")
+			return nil
+		}
+		log.WithField("outQuantity", u).Error("Invalid outbound tunnel quantity")
+		return fmt.Errorf("Invalid outbound tunnel quantity")
+	}
+}
+
+// SetInBackups sets the inbound tunnel backups
+func SetInBackups(u int) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		if u < 6 && u >= 0 {
+			c.I2PConfig.InBackupQuantity = u
+			log.WithField("inBackups", u).Debug("Set inbound tunnel backups")
+			return nil
+		}
+		log.WithField("inBackups", u).Error("Invalid inbound tunnel backup quantity")
+		return fmt.Errorf("Invalid inbound tunnel backup quantity")
+	}
+}
+
+// SetOutBackups sets the inbound tunnel backups
+func SetOutBackups(u int) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		if u < 6 && u >= 0 {
+			c.I2PConfig.OutBackupQuantity = u
+			log.WithField("outBackups", u).Debug("Set outbound tunnel backups")
+			return nil
+		}
+		log.WithField("outBackups", u).Error("Invalid outbound tunnel backup quantity")
+		return fmt.Errorf("Invalid outbound tunnel backup quantity")
+	}
+}
+
+// SetEncrypt tells the router to use an encrypted leaseset
+func SetEncrypt(b bool) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.EncryptLeaseSet = b
+		log.WithField("encrypt", b).Debug("Set lease set encryption")
+		return nil
+	}
+}
+
+// SetLeaseSetKey sets the host of the SAMEmit's SAM bridge
+func SetLeaseSetKey(s string) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.LeaseSetKey = s
+		log.WithField("leaseSetKey", s).Debug("Set lease set key")
+		return nil
+	}
+}
+
+// SetLeaseSetPrivateKey sets the host of the SAMEmit's SAM bridge
+func SetLeaseSetPrivateKey(s string) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.LeaseSetPrivateKey = s
+		log.WithField("leaseSetPrivateKey", s).Debug("Set lease set private key")
+		return nil
+	}
+}
+
+// SetLeaseSetPrivateSigningKey sets the host of the SAMEmit's SAM bridge
+func SetLeaseSetPrivateSigningKey(s string) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.LeaseSetPrivateSigningKey = s
+		log.WithField("leaseSetPrivateSigningKey", s).Debug("Set lease set private signing key")
+		return nil
+	}
+}
+
+// SetMessageReliability sets the host of the SAMEmit's SAM bridge
+func SetMessageReliability(s string) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.TransportOptions.MessageReliability = s
+		log.WithField("messageReliability", s).Debug("Set message reliability")
+		return nil
+	}
+}
+
+// SetAllowZeroIn tells the tunnel to accept zero-hop peers
+func SetAllowZeroIn(b bool) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.InAllowZeroHop = b
+		log.WithField("allowZeroIn", b).Debug("Set allow zero-hop inbound")
+		return nil
+	}
+}
+
+// SetAllowZeroOut tells the tunnel to accept zero-hop peers
+func SetAllowZeroOut(b bool) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.OutAllowZeroHop = b
+		log.WithField("allowZeroOut", b).Debug("Set allow zero-hop outbound")
+		return nil
+	}
+}
+
+// SetCompress tells clients to use compression
+func SetCompress(b bool) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		if b {
+			c.I2PConfig.UseCompression = "true"
+			return nil
+		}
+		c.I2PConfig.UseCompression = "false"
+		log.WithField("compress", b).Debug("Set compression")
+		return nil
+	}
+}
+
+// SetFastRecieve tells clients to use compression
+func SetFastRecieve(b bool) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		if b {
+			c.I2PConfig.TransportOptions.FastReceive = "true"
+			return nil
+		}
+		c.I2PConfig.TransportOptions.FastReceive = "false"
+		log.WithField("fastReceive", b).Debug("Set fast receive")
+		return nil
+	}
+}
+
+// SetReduceIdle tells the connection to reduce it's tunnels during extended idle time.
+func SetReduceIdle(b bool) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.ReduceIdle = b
+		log.WithField("reduceIdle", b).Debug("Set reduce idle")
+		return nil
+	}
+}
+
+// SetReduceIdleTime sets the time to wait before reducing tunnels to idle levels
+func SetReduceIdleTime(u int) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.TransportOptions.ReduceIdleTimeout = 300000
+		if u >= 6 {
+			idleTime := (u * 60) * 1000
+			c.I2PConfig.TransportOptions.ReduceIdleTimeout = time.Duration(idleTime)
+			log.WithFields(logrus.Fields{
+				"minutes":      u,
+				"milliseconds": idleTime,
+			}).Debug("Set reduce idle time")
+			return nil
+		}
+		log.WithField("minutes", u).Error("Invalid reduce idle timeout")
+		return fmt.Errorf("Invalid reduce idle timeout(Measured in minutes) %v", u)
+	}
+}
+
+// SetReduceIdleTimeMs sets the time to wait before reducing tunnels to idle levels in milliseconds
+func SetReduceIdleTimeMs(u int) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.TransportOptions.ReduceIdleTimeout = 300000
+		if u >= 300000 {
+			c.I2PConfig.TransportOptions.ReduceIdleTimeout = time.Duration(u)
+			log.WithField("reduceIdleTimeMs", u).Debug("Set reduce idle time in milliseconds")
+			return nil
+		}
+		return fmt.Errorf("Invalid reduce idle timeout(Measured in milliseconds) %v", u)
+	}
+}
+
+// SetReduceIdleQuantity sets minimum number of tunnels to reduce to during idle time
+func SetReduceIdleQuantity(u int) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		if u < 5 {
+			c.I2PConfig.ReduceIdleQuantity = u
+			log.WithField("reduceIdleQuantity", u).Debug("Set reduce idle quantity")
+			return nil
+		}
+		log.WithField("quantity", u).Error("Invalid reduce tunnel quantity")
+		return fmt.Errorf("Invalid reduce tunnel quantity")
+	}
+}
+
+// SetCloseIdle tells the connection to close it's tunnels during extended idle time.
+func SetCloseIdle(b bool) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.CloseIdle = b
+		return nil
+	}
+}
+
+// SetCloseIdleTime sets the time to wait before closing tunnels to idle levels
+func SetCloseIdleTime(u int) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.TransportOptions.CloseIdleTimeout = 300000
+		if u >= 6 {
+			idleTime := (u * 60) * 1000
+			c.I2PConfig.TransportOptions.CloseIdleTimeout = time.Duration(idleTime)
+			log.WithFields(logrus.Fields{
+				"minutes":      u,
+				"milliseconds": idleTime,
+			}).Debug("Set close idle time")
+			return nil
+		}
+		log.WithField("minutes", u).Error("Invalid close idle timeout")
+		return fmt.Errorf("Invalid close idle timeout(Measured in minutes) %v", u)
+	}
+}
+
+// SetCloseIdleTimeMs sets the time to wait before closing tunnels to idle levels in milliseconds
+func SetCloseIdleTimeMs(u int) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		c.I2PConfig.TransportOptions.CloseIdleTimeout = 300000
+		if u >= 300000 {
+			c.I2PConfig.TransportOptions.CloseIdleTimeout = time.Duration(u)
+			log.WithField("closeIdleTimeMs", u).Debug("Set close idle time in milliseconds")
+			return nil
+		}
+		return fmt.Errorf("Invalid close idle timeout(Measured in milliseconds) %v", u)
+	}
+}
+
+// SetAccessListType tells the system to treat the AccessList as a whitelist
+func SetAccessListType(s string) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		if s == "whitelist" {
+			c.I2PConfig.AccessListType = "whitelist"
+			log.Debug("Set access list type to whitelist")
+			return nil
+		} else if s == "blacklist" {
+			c.I2PConfig.AccessListType = "blacklist"
+			log.Debug("Set access list type to blacklist")
+			return nil
+		} else if s == "none" {
+			c.I2PConfig.AccessListType = ""
+			log.Debug("Set access list type to none")
+			return nil
+		} else if s == "" {
+			c.I2PConfig.AccessListType = ""
+			log.Debug("Set access list type to none")
+			return nil
+		}
+		return fmt.Errorf("Invalid Access list type(whitelist, blacklist, none)")
+	}
+}
+
+// SetAccessList tells the system to treat the AccessList as a whitelist
+func SetAccessList(s []string) func(*SAMEmit) error {
+	return func(c *SAMEmit) error {
+		if len(s) > 0 {
+			for _, a := range s {
+				c.I2PConfig.AccessList = append(c.I2PConfig.AccessList, a)
+			}
+			log.WithField("accessList", s).Debug("Set access list")
+			return nil
+		}
+		log.Debug("No access list set (empty list provided)")
+		return nil
+	}
+}

emit.go

@@ -0,0 +1,119 @@
+package sam3
+
+import (
+	"fmt"
+	"net"
+	"strings"
+
+	"github.com/sirupsen/logrus"
+)
+
+type SAMEmit struct {
+	I2PConfig
+}
+
+func (e *SAMEmit) OptStr() string {
+	optStr := strings.Join(e.I2PConfig.Print(), " ")
+	log.WithField("optStr", optStr).Debug("Generated option string")
+	return optStr
+}
+
+func (e *SAMEmit) Hello() string {
+	hello := fmt.Sprintf("HELLO VERSION MIN=%s MAX=%s \n", e.I2PConfig.MinSAM(), e.I2PConfig.MaxSAM())
+	log.WithField("hello", hello).Debug("Generated HELLO command")
+	return hello
+}
+
+func (e *SAMEmit) HelloBytes() []byte {
+	return []byte(e.Hello())
+}
+
+func (e *SAMEmit) GenerateDestination() string {
+	dest := fmt.Sprintf("DEST GENERATE %s \n", e.I2PConfig.SignatureType())
+	log.WithField("destination", dest).Debug("Generated DEST GENERATE command")
+	return dest
+}
+
+func (e *SAMEmit) GenerateDestinationBytes() []byte {
+	return []byte(e.GenerateDestination())
+}
+
+func (e *SAMEmit) Lookup(name string) string {
+	lookup := fmt.Sprintf("NAMING LOOKUP NAME=%s \n", name)
+	log.WithField("lookup", lookup).Debug("Generated NAMING LOOKUP command")
+	return lookup
+}
+
+func (e *SAMEmit) LookupBytes(name string) []byte {
+	return []byte(e.Lookup(name))
+}
+
+func (e *SAMEmit) Connect(dest string) string {
+	connect := fmt.Sprintf(
+		"STREAM CONNECT ID=%s %s %s DESTINATION=%s \n",
+		e.I2PConfig.ID(),
+		e.I2PConfig.FromPort(),
+		e.I2PConfig.ToPort(),
+		dest,
+	)
+	log.WithField("connect", connect).Debug("Generated STREAM CONNECT command")
+	return connect
+}
+
+func (e *SAMEmit) ConnectBytes(dest string) []byte {
+	return []byte(e.Connect(dest))
+}
+
+func (e *SAMEmit) Accept() string {
+	accept := fmt.Sprintf(
+		"STREAM ACCEPT ID=%s %s %s",
+		e.I2PConfig.ID(),
+		e.I2PConfig.FromPort(),
+		e.I2PConfig.ToPort(),
+	)
+	log.WithField("accept", accept).Debug("Generated STREAM ACCEPT command")
+	return accept
+}
+
+func (e *SAMEmit) AcceptBytes() []byte {
+	return []byte(e.Accept())
+}
+
+func NewEmit(opts ...func(*SAMEmit) error) (*SAMEmit, error) {
+	var emit SAMEmit
+	for _, o := range opts {
+		if err := o(&emit); err != nil {
+			log.WithError(err).Error("Failed to apply option")
+			return nil, err
+		}
+	}
+	log.Debug("New SAMEmit instance created")
+	return &emit, nil
+}
+
+func IgnorePortError(err error) error {
+	if err == nil {
+		return nil
+	}
+	if strings.Contains(err.Error(), "missing port in address") {
+		log.Debug("Ignoring 'missing port in address' error")
+		err = nil
+	}
+	return err
+}
+
+func SplitHostPort(hostport string) (string, string, error) {
+	host, port, err := net.SplitHostPort(hostport)
+	if err != nil {
+		if IgnorePortError(err) == nil {
+			log.WithField("host", hostport).Debug("Using full string as host, port set to 0")
+			host = hostport
+			port = "0"
+		}
+	}
+	log.WithFields(logrus.Fields{
+		"host": host,
+		"port": port,
+	}).Debug("Split host and port")
+	return host, port, nil
+}

go.mod

@@ -0,0 +1,13 @@
+module github.com/go-i2p/sam3
+
+go 1.23.3
+
+require (
+	github.com/go-i2p/i2pkeys v0.33.92
+	github.com/go-i2p/logger v0.0.0-20241123010126-3050657e5d0c
+	github.com/sirupsen/logrus v1.9.3
+)
+
+require golang.org/x/sys v0.27.0 // indirect
+
+replace github.com/go-i2p/i2pkeys v0.33.92 => ../i2pkeys

go.sum

@@ -0,0 +1,18 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/go-i2p/logger v0.0.0-20241123010126-3050657e5d0c h1:VTiECn3dFEmUlZjto+wOwJ7SSJTHPLyNprQMR5HzIMI=
+github.com/go-i2p/logger v0.0.0-20241123010126-3050657e5d0c/go.mod h1:te7Zj3g3oMeIl8uBXAgO62UKmZ6m6kHRNg1Mm+X8Hzk=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
+github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.27.0 h1:wBqf8DvsY9Y/2P8gAfPDEYNuS30J4lPHJxXSb/nJZ+s=
+golang.org/x/sys v0.27.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

index.html

@@ -0,0 +1,331 @@
+<html>
+  <head>
+    <title>
+      README
+    </title>
+    <meta name="author" content="eyedeekay" />
+    <meta name="description" content="sam3" />
+    <meta name="keywords" content="master" />
+    <link rel="stylesheet" type="text/css" href="style.css" />
+    <link rel="stylesheet" type="text/css" href="showhider.css" />
+  </head>
+  <body>
+    <div id="navbar">
+      <a href="#shownav">
+        Show navigation
+      </a>
+      <div id="shownav">
+        <div id="hidenav">
+          <ul>
+            <li>
+              <a href="index.html">
+                index
+              </a>
+            </li>
+          </ul>
+          <br>
+          <a href="#hidenav">
+            Hide Navigation
+          </a>
+        </div>
+      </div>
+    </div>
+    <h1>
+      <a href="#readme" rel="nofollow">
+        <span></span>
+      </a>
+      README
+    </h1>
+    <h2>
+      <a href="#important" rel="nofollow">
+        <span></span>
+      </a>
+      !!IMPORTANT!!
+    </h2>
+    <p>
+      In the next version, I&#39;ll be moving the
+      <code>
+        i2pkeys
+      </code>
+      directory to it&#39;s own repository
+      so I can avoid import cycle headaches. Please migrate to the new
+      <code>
+        i2pkeys
+      </code>
+      repository
+      before upgrading your sam3 dependencies. You can probably do this by running:
+    </p>
+    <div>
+      <pre>find . -name &#39;*.go&#39; -exec sed -i &#39;s|github.com/eyedeekay/sam3/i2pkeys|github.com/eyedeekay/i2pkeys|g&#39; {} \;
+</pre>
+    </div>
+    <p>
+      STATUS: This project is maintained. I will respond to issues, pull requests, and feature requests within a few days.
+    </p>
+    <h1>
+      <a href="#readme" rel="nofollow">
+        <span></span>
+      </a>
+      README
+    </h1>
+    <p>
+      go library for the I2P
+      <a href="https://geti2p.net/en/docs/api/samv3" rel="nofollow">
+        SAMv3.0
+      </a>
+      bridge, used to build anonymous/pseudonymous end-to-end encrypted sockets.
+    </p>
+    <p>
+      This library is much better than ccondom (that use BOB), much more stable and much easier to maintain.
+    </p>
+    <h2>
+      <a href="#support-todo" rel="nofollow">
+        <span></span>
+      </a>
+      Support/TODO
+    </h2>
+    <p>
+      <strong>
+        What works:
+      </strong>
+    </p>
+    <ul>
+      <li>
+        Utils
+        <ul>
+          <li>
+            Resolving domain names to I2P destinations
+          </li>
+          <li>
+            .b32.i2p hashes
+          </li>
+          <li>
+            Generating keys/i2p destinations
+          </li>
+        </ul>
+      </li>
+      <li>
+        Streaming
+        <ul>
+          <li>
+            DialI2P() - Connecting to stuff in I2P
+          </li>
+          <li>
+            Listen()/Accept() - Handling incomming connections
+          </li>
+          <li>
+            Implements net.Conn and net.Listener
+          </li>
+        </ul>
+      </li>
+      <li>
+        Datagrams
+        <ul>
+          <li>
+            Implements net.PacketConn
+          </li>
+        </ul>
+      </li>
+      <li>
+        Raw datagrams
+        <ul>
+          <li>
+            Like datagrams, but without addresses
+          </li>
+        </ul>
+      </li>
+    </ul>
+    <p>
+      <strong>
+        Does not work:
+      </strong>
+    </p>
+    <ul>
+      <li>
+        Stream Forwarding
+      </li>
+      <li>
+        Probably needs some real-world testing
+      </li>
+    </ul>
+    <h2>
+      <a href="#documentation" rel="nofollow">
+        <span></span>
+      </a>
+      Documentation
+    </h2>
+    <ul>
+      <li>
+        Latest version-documentation:
+        <ul>
+          <li>
+            set your GOPATH
+          </li>
+          <li>
+            Enter
+            <code>
+              godoc -http=:8081
+            </code>
+            into your terminal and hit enter.
+          </li>
+          <li>
+            Goto
+            <a href="http://localhost:8081" rel="nofollow">
+              http://localhost:8081
+            </a>
+            , click packages, and navigate to sam3
+          </li>
+        </ul>
+      </li>
+    </ul>
+    <h2>
+      <a href="#examples" rel="nofollow">
+        <span></span>
+      </a>
+      Examples
+    </h2>
+    <div>
+      <pre>package main
+
+import (
+	&#34;github.com/eyedeekay/sam3&#34;
+	&#34;github.com/eyedeekay/sam3/i2pkeys&#34;
+	&#34;fmt&#34;
+)
+
+const yoursam = &#34;127.0.0.1:7656&#34; // sam bridge
+
+func client(server i2pkeys.I2PAddr) {
+	sam, _ := sam3.NewSAM(yoursam)
+	keys, _ := sam.NewKeys()
+	stream, _ := sam.NewStreamSession(&#34;clientTun&#34;, keys, sam3.Options_Small)
+	fmt.Println(&#34;Client: Connecting to &#34; + server.Base32())
+	conn, _ := stream.DialI2P(server)
+	conn.Write([]byte(&#34;Hello world!&#34;))
+	return
+}
+
+func main() {
+	sam, _ := NewSAM(yoursam)
+	keys, _ := sam.NewKeys()
+	stream, _ := sam.NewStreamSession(&#34;serverTun&#34;, keys, sam3.Options_Medium)
+	listener, _ := stream.Listen()
+	go client(keys.Addr())
+	conn, _ := listener.Accept()
+	buf := make([]byte, 4096)
+	n, _ := conn.Read(buf)
+	fmt.Println(&#34;Server received: &#34; + string(buf[:n]))
+}
+</pre>
+    </div>
+    <p>
+      The above will write to the terminal:
+    </p>
+    <div>
+      <pre>Client: Connecting to zjnvfh4hs3et5vtz35ogwzrws26zvwkcad5uo5esecvg4qpk5b4a.b32.i2p
+Server received: Hello world!
+</pre>
+    </div>
+    <p>
+      Error handling was omitted in the above code for readability.
+    </p>
+    <h2>
+      <a href="#testing" rel="nofollow">
+        <span></span>
+      </a>
+      Testing
+    </h2>
+    <ul>
+      <li>
+        <code>
+          go test -tags=nettest
+        </code>
+        runs the whole suite (takes 90+ sec to perform!)
+      </li>
+      <li>
+        <code>
+          go test -short
+        </code>
+        runs the shorter variant, does not connect to anything
+      </li>
+    </ul>
+    <h2>
+      <a href="#license" rel="nofollow">
+        <span></span>
+      </a>
+      License
+    </h2>
+    <p>
+      Public domain.
+    </p>
+    <h2>
+      <a href="#author" rel="nofollow">
+        <span></span>
+      </a>
+      Author
+    </h2>
+    <ul>
+      <li>
+        Kalle Vedin
+        <code>
+          kalle.vedin@fripost.org
+        </code>
+      </li>
+      <li>
+        Unknown Name (majestrate)
+      </li>
+      <li>
+        idk
+      </li>
+      <li>
+        qiwenmin
+      </li>
+    </ul>
+    <div>
+      <a href="#show">
+        Show license
+      </a>
+      <div id="show">
+        <div id="hide">
+          <pre><code>This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>
+</code></pre>
+          <a href="#hide">
+            Hide license
+          </a>
+        </div>
+      </div>
+    </div>
+    <div>
+      <iframe src="https://snowflake.torproject.org/embed.html" width="320" height="240" frameborder="0" scrolling="no"></iframe>
+    </div>
+    <div>
+      <a href="https://geti2p.net/">
+        <img src="i2plogo.png"></img>
+        I2P
+      </a>
+    </div>
+  </body>
+</html>

log.go

@@ -0,0 +1,5 @@
+package sam3
+
+import logger "github.com/go-i2p/sam3/log"
+
+var log = logger.GetSAM3Logger()

opts/suggestedOptions.go

@@ -0,0 +1,123 @@
+package sam3opts
+
+import (
+	"net"
+	"os"
+	"strings"
+
+	logger "github.com/go-i2p/sam3/log"
+	"github.com/sirupsen/logrus"
+)
+
+var log = logger.GetSAM3Logger()
+
+// Examples and suggestions for options when creating sessions.
+var (
+	// Suitable options if you are shuffling A LOT of traffic. If unused, this
+	// will waste your resources.
+	Options_Humongous = []string{
+		"inbound.length=3", "outbound.length=3",
+		"inbound.lengthVariance=1", "outbound.lengthVariance=1",
+		"inbound.backupQuantity=3", "outbound.backupQuantity=3",
+		"inbound.quantity=6", "outbound.quantity=6",
+	}
+
+	// Suitable for shuffling a lot of traffic.
+	Options_Large = []string{
+		"inbound.length=3", "outbound.length=3",
+		"inbound.lengthVariance=1", "outbound.lengthVariance=1",
+		"inbound.backupQuantity=1", "outbound.backupQuantity=1",
+		"inbound.quantity=4", "outbound.quantity=4",
+	}
+
+	// Suitable for shuffling a lot of traffic quickly with minimum
+	// anonymity. Uses 1 hop and multiple tunnels.
+	Options_Wide = []string{
+		"inbound.length=1", "outbound.length=1",
+		"inbound.lengthVariance=1", "outbound.lengthVariance=1",
+		"inbound.backupQuantity=2", "outbound.backupQuantity=2",
+		"inbound.quantity=3", "outbound.quantity=3",
+	}
+
+	// Suitable for shuffling medium amounts of traffic.
+	Options_Medium = []string{
+		"inbound.length=3", "outbound.length=3",
+		"inbound.lengthVariance=1", "outbound.lengthVariance=1",
+		"inbound.backupQuantity=0", "outbound.backupQuantity=0",
+		"inbound.quantity=2", "outbound.quantity=2",
+	}
+
+	// Sensible defaults for most people
+	Options_Default = []string{
+		"inbound.length=3", "outbound.length=3",
+		"inbound.lengthVariance=0", "outbound.lengthVariance=0",
+		"inbound.backupQuantity=1", "outbound.backupQuantity=1",
+		"inbound.quantity=1", "outbound.quantity=1",
+	}
+
+	// Suitable only for small dataflows, and very short lasting connections:
+	// You only have one tunnel in each direction, so if any of the nodes
+	// through which any of your two tunnels pass through go offline, there will
+	// be a complete halt in the dataflow, until a new tunnel is built.
+	Options_Small = []string{
+		"inbound.length=3", "outbound.length=3",
+		"inbound.lengthVariance=1", "outbound.lengthVariance=1",
+		"inbound.backupQuantity=0", "outbound.backupQuantity=0",
+		"inbound.quantity=1", "outbound.quantity=1",
+	}
+
+	// Does not use any anonymization, you connect directly to others tunnel
+	// endpoints, thus revealing your identity but not theirs. Use this only
+	// if you don't care.
+	Options_Warning_ZeroHop = []string{
+		"inbound.length=0", "outbound.length=0",
+		"inbound.lengthVariance=0", "outbound.lengthVariance=0",
+		"inbound.backupQuantity=0", "outbound.backupQuantity=0",
+		"inbound.quantity=2", "outbound.quantity=2",
+	}
+)
+
+func getEnv(key, fallback string) string {
+	logger.InitializeSAM3Logger()
+	value, ok := os.LookupEnv(key)
+	if !ok {
+		log.WithFields(logrus.Fields{
+			"key":      key,
+			"fallback": fallback,
+		}).Debug("Environment variable not set, using fallback")
+		return fallback
+	}
+	log.WithFields(logrus.Fields{
+		"key":   key,
+		"value": value,
+	}).Debug("Retrieved environment variable")
+	return value
+}
+
+var (
+	SAM_HOST = getEnv("sam_host", "127.0.0.1")
+	SAM_PORT = getEnv("sam_port", "7656")
+)
+
+func SAMDefaultAddr(fallforward string) string {
+	if fallforward == "" {
+		addr := net.JoinHostPort(SAM_HOST, SAM_PORT)
+		log.WithField("addr", addr).Debug("Using default SAM address")
+		return addr
+	}
+	log.WithField("addr", fallforward).Debug("Using fallforward SAM address")
+	return fallforward
+}
+
+func GenerateOptionString(opts []string) string {
+	optStr := strings.Join(opts, " ")
+	log.WithField("options", optStr).Debug("Generating option string")
+	if strings.Contains(optStr, "i2cp.leaseSetEncType") {
+		log.Debug("i2cp.leaseSetEncType already present in options")
+		return optStr
+	}
+	finalOpts := optStr + " i2cp.leaseSetEncType=4,0"
+	log.WithField("finalOptions", finalOpts).Debug("Added default i2cp.leaseSetEncType to options")
+	return finalOpts
+	// return optStr + " i2cp.leaseSetEncType=4,0"
+}

primary.go

@@ -0,0 +1,522 @@
+package sam3
+
+import (
+	"errors"
+	"fmt"
+	"math/rand"
+	"net"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/go-i2p/i2pkeys"
+	"github.com/go-i2p/sam3/common"
+)
+
+const (
+	session_ADDOK = "SESSION STATUS RESULT=OK"
+)
+
+func randport() string {
+	s := rand.NewSource(time.Now().UnixNano())
+	r := rand.New(s)
+	p := r.Intn(55534) + 10000
+	port := strconv.Itoa(p)
+	log.WithField("port", port).Debug("Generated random port")
+	return strconv.Itoa(p)
+}
+
+// Represents a primary session.
+type PrimarySession struct {
+	samAddr  string          // address to the sam bridge (ipv4:port)
+	id       string          // tunnel name
+	conn     net.Conn        // connection to sam
+	keys     i2pkeys.I2PKeys // i2p destination keys
+	Timeout  time.Duration
+	Deadline time.Time
+	sigType  string
+	Config   SAMEmit
+	stsess   map[string]*StreamSession
+	dgsess   map[string]*DatagramSession
+	sync.RWMutex
+	//	from     string
+	//	to       string
+}
+
+func (ss *PrimarySession) From() string {
+	return "0"
+}
+
+func (ss *PrimarySession) To() string {
+	return "0"
+}
+
+func (ss *PrimarySession) SignatureType() string {
+	return ss.sigType
+}
+
+// Returns the local tunnel name of the I2P tunnel used for the stream session
+func (ss *PrimarySession) ID() string {
+	return ss.id
+}
+
+func (ss *PrimarySession) Close() error {
+	return ss.conn.Close()
+}
+
+// Returns the I2P destination (the address) of the stream session
+func (ss *PrimarySession) Addr() i2pkeys.I2PAddr {
+	return ss.keys.Addr()
+}
+
+func (ss *PrimarySession) LocalAddr() net.Addr {
+	aa := ss.keys.Addr()
+	return &aa
+}
+
+// Returns the keys associated with the stream session
+func (ss *PrimarySession) Keys() i2pkeys.I2PKeys {
+	return ss.keys
+}
+
+func (sam *PrimarySession) Dial(network, addr string) (net.Conn, error) {
+	log.WithFields(logrus.Fields{"network": network, "addr": addr}).Debug("Dial() called")
+	if network == "udp" || network == "udp4" || network == "udp6" {
+		// return sam.DialUDPI2P(network, network+addr[0:4], addr)
+		return sam.DialUDPI2P(network, network+addr[0:4], addr)
+	}
+	if network == "tcp" || network == "tcp4" || network == "tcp6" {
+		// return sam.DialTCPI2P(network, network+addr[0:4], addr)
+		return sam.DialTCPI2P(network, network+addr[0:4], addr)
+	}
+	log.WithField("network", network).Error("Invalid network type")
+	return nil, fmt.Errorf("Error: Must specify a valid network type")
+}
+
+// DialTCP implements x/dialer
+func (sam *PrimarySession) DialTCP(network string, laddr, raddr net.Addr) (net.Conn, error) {
+	log.WithFields(logrus.Fields{"network": network, "laddr": laddr, "raddr": raddr}).Debug("DialTCP() called")
+	sam.RLock()
+	ts, ok := sam.stsess[network+raddr.String()[0:4]]
+	sam.RUnlock()
+
+	if !ok {
+		sam.Lock()
+		ts, err := sam.NewUniqueStreamSubSession(network + raddr.String()[0:4])
+		if err != nil {
+			log.WithError(err).Error("Failed to create new unique stream sub-session")
+			sam.Unlock()
+			return nil, err
+		}
+		sam.stsess[network+raddr.String()[0:4]] = ts
+		sam.Unlock()
+	}
+	return ts.Dial(network, raddr.String())
+}
+
+func (sam *PrimarySession) DialTCPI2P(network, laddr, raddr string) (net.Conn, error) {
+	log.WithFields(logrus.Fields{"network": network, "laddr": laddr, "raddr": raddr}).Debug("DialTCPI2P() called")
+	sam.RLock()
+	ts, ok := sam.stsess[network+raddr[0:4]]
+	sam.RUnlock()
+	if !ok {
+		sam.Lock()
+		ts, err := sam.NewUniqueStreamSubSession(network + laddr)
+		if err != nil {
+			log.WithError(err).Error("Failed to create new unique stream sub-session")
+			sam.Unlock()
+			return nil, err
+		}
+		sam.stsess[network+raddr[0:4]] = ts
+		sam.Unlock()
+	}
+	return ts.Dial(network, raddr)
+}
+
+// DialUDP implements x/dialer
+func (sam *PrimarySession) DialUDP(network string, laddr, raddr net.Addr) (net.PacketConn, error) {
+	log.WithFields(logrus.Fields{"network": network, "laddr": laddr, "raddr": raddr}).Debug("DialUDP() called")
+	sam.RLock()
+	ds, ok := sam.dgsess[network+raddr.String()[0:4]]
+	sam.RUnlock()
+	if !ok {
+		sam.Lock()
+		ds, err := sam.NewDatagramSubSession(network+raddr.String()[0:4], 0)
+		if err != nil {
+			log.WithError(err).Error("Failed to create new datagram sub-session")
+			sam.Unlock()
+			return nil, err
+		}
+		sam.dgsess[network+raddr.String()[0:4]] = ds
+		sam.Unlock()
+	}
+	return ds.Dial(network, raddr.String())
+}
+
+func (sam *PrimarySession) DialUDPI2P(network, laddr, raddr string) (*DatagramSession, error) {
+	log.WithFields(logrus.Fields{"network": network, "laddr": laddr, "raddr": raddr}).Debug("DialUDPI2P() called")
+	sam.RLock()
+	ds, ok := sam.dgsess[network+raddr[0:4]]
+	sam.RUnlock()
+	if !ok {
+		sam.Lock()
+		ds, err := sam.NewDatagramSubSession(network+laddr, 0)
+		if err != nil {
+			log.WithError(err).Error("Failed to create new datagram sub-session")
+			sam.Unlock()
+			return nil, err
+		}
+		sam.dgsess[network+raddr[0:4]] = ds
+		sam.Unlock()
+	}
+	return ds.Dial(network, raddr)
+}
+
+func (s *PrimarySession) Lookup(name string) (a net.Addr, err error) {
+	log.WithField("name", name).Debug("Lookup() called")
+	var sam *SAM
+	name = strings.Split(name, ":")[0]
+	sam, err = NewSAM(s.samAddr)
+	if err == nil {
+		log.WithField("addr", a).Debug("Lookup successful")
+		defer sam.Close()
+		a, err = sam.Lookup(name)
+	}
+	log.WithError(err).Error("Lookup failed")
+	return
+}
+
+func (sam *PrimarySession) Resolve(network, addr string) (net.Addr, error) {
+	log.WithFields(logrus.Fields{"network": network, "addr": addr}).Debug("Resolve() called")
+	return sam.Lookup(addr)
+}
+
+func (sam *PrimarySession) ResolveTCPAddr(network, dest string) (net.Addr, error) {
+	log.WithFields(logrus.Fields{"network": network, "dest": dest}).Debug("ResolveTCPAddr() called")
+	return sam.Lookup(dest)
+}
+
+func (sam *PrimarySession) ResolveUDPAddr(network, dest string) (net.Addr, error) {
+	log.WithFields(logrus.Fields{"network": network, "dest": dest}).Debug("ResolveUDPAddr() called")
+	return sam.Lookup(dest)
+}
+
+// Creates a new PrimarySession with the I2CP- and streaminglib options as
+// specified. See the I2P documentation for a full list of options.
+func (sam *SAM) NewPrimarySession(id string, keys i2pkeys.I2PKeys, options []string) (*PrimarySession, error) {
+	log.WithFields(logrus.Fields{"id": id, "options": options}).Debug("NewPrimarySession() called")
+	return sam.newPrimarySession(PrimarySessionSwitch, id, keys, options)
+}
+
+func (sam *SAM) newPrimarySession(primarySessionSwitch, id string, keys i2pkeys.I2PKeys, options []string) (*PrimarySession, error) {
+	log.WithFields(logrus.Fields{
+		"primarySessionSwitch": primarySessionSwitch,
+		"id":                   id,
+		"options":              options,
+	}).Debug("newPrimarySession() called")
+
+	conn, err := sam.newGenericSession(primarySessionSwitch, id, keys, options, []string{})
+	if err != nil {
+		log.WithError(err).Error("Failed to create new generic session")
+		return nil, err
+	}
+	ssesss := make(map[string]*StreamSession)
+	dsesss := make(map[string]*DatagramSession)
+	return &PrimarySession{
+		samAddr:  sam.SAMEmit.I2PConfig.Sam(),
+		id:       id,
+		conn:     conn,
+		keys:     keys,
+		Timeout:  time.Duration(600 * time.Second),
+		Deadline: time.Now(),
+		sigType:  Sig_NONE,
+		Config:   sam.SAMEmit,
+		stsess:   ssesss,
+		dgsess:   dsesss,
+		RWMutex:  sync.RWMutex{},
+	}, nil
+}
+
+// Creates a new PrimarySession with the I2CP- and PRIMARYinglib options as
+// specified. See the I2P documentation for a full list of options.
+func (sam *SAM) NewPrimarySessionWithSignature(id string, keys i2pkeys.I2PKeys, options []string, sigType string) (*PrimarySession, error) {
+	log.WithFields(logrus.Fields{
+		"id":      id,
+		"options": options,
+		"sigType": sigType,
+	}).Debug("NewPrimarySessionWithSignature() called")
+
+	conn, err := sam.newGenericSessionWithSignature(PrimarySessionSwitch, id, keys, sigType, options, []string{})
+	if err != nil {
+		log.WithError(err).Error("Failed to create new generic session with signature")
+		return nil, err
+	}
+	ssesss := make(map[string]*StreamSession)
+	dsesss := make(map[string]*DatagramSession)
+	return &PrimarySession{
+		samAddr:  sam.SAMEmit.I2PConfig.Sam(),
+		id:       id,
+		conn:     conn,
+		keys:     keys,
+		Timeout:  time.Duration(600 * time.Second),
+		Deadline: time.Now(),
+		sigType:  sigType,
+		Config:   sam.SAMEmit,
+		stsess:   ssesss,
+		dgsess:   dsesss,
+		RWMutex:  sync.RWMutex{},
+	}, nil
+}
+
+// Creates a new session with the style of either "STREAM", "DATAGRAM" or "RAW",
+// for a new I2P tunnel with name id, using the cypher keys specified, with the
+// I2CP/streaminglib-options as specified. Extra arguments can be specified by
+// setting extra to something else than []string{}.
+// This sam3 instance is now a session
+func (sam *PrimarySession) newGenericSubSession(style, id string, extras []string) (net.Conn, error) {
+	log.WithFields(logrus.Fields{"style": style, "id": id, "extras": extras}).Debug("newGenericSubSession called")
+	return sam.newGenericSubSessionWithSignature(style, id, extras)
+}
+
+func (sam *PrimarySession) newGenericSubSessionWithSignature(style, id string, extras []string) (net.Conn, error) {
+	log.WithFields(logrus.Fields{"style": style, "id": id, "extras": extras}).Debug("newGenericSubSessionWithSignature called")
+	return sam.newGenericSubSessionWithSignatureAndPorts(style, id, "0", "0", extras)
+}
+
+// Creates a new session with the style of either "STREAM", "DATAGRAM" or "RAW",
+// for a new I2P tunnel with name id, using the cypher keys specified, with the
+// I2CP/streaminglib-options as specified. Extra arguments can be specified by
+// setting extra to something else than []string{}.
+// This sam3 instance is now a session
+func (sam *PrimarySession) newGenericSubSessionWithSignatureAndPorts(style, id, from, to string, extras []string) (net.Conn, error) {
+	log.WithFields(logrus.Fields{"style": style, "id": id, "from": from, "to": to, "extras": extras}).Debug("newGenericSubSessionWithSignatureAndPorts called")
+
+	conn := sam.conn
+	scmsg := []byte(fmt.Sprintf("SESSION ADD STYLE=%s ID=%s FROM_PORT=%s TO_PORT=%s %s\n", style, id, from, to, strings.Join(extras, " ")))
+
+	log.WithField("message", string(scmsg)).Debug("Sending SESSION ADD message")
+
+	for m, i := 0, 0; m != len(scmsg); i++ {
+		if i == 15 {
+			conn.Close()
+			log.Error("Writing to SAM failed after 15 attempts")
+			return nil, errors.New("writing to SAM failed")
+		}
+		n, err := conn.Write(scmsg[m:])
+		if err != nil {
+			log.WithError(err).Error("Failed to write to SAM connection")
+			conn.Close()
+			return nil, err
+		}
+		m += n
+	}
+	buf := make([]byte, 4096)
+	n, err := conn.Read(buf)
+	if err != nil {
+		log.WithError(err).Error("Failed to read from SAM connection")
+		conn.Close()
+		return nil, err
+	}
+	text := string(buf[:n])
+	log.WithField("response", text).Debug("Received response from SAM")
+	// log.Println("SAM:", text)
+	if strings.HasPrefix(text, session_ADDOK) {
+		//if sam.keys.String() != text[len(session_ADDOK):len(text)-1] {
+		//conn.Close()
+		//return nil, errors.New("SAMv3 created a tunnel with keys other than the ones we asked it for")
+		//}
+		log.Debug("Session added successfully")
+		return conn, nil //&StreamSession{id, conn, keys, nil, sync.RWMutex{}, nil}, nil
+	} else if text == session_DUPLICATE_ID {
+		log.Error("Duplicate tunnel name")
+		conn.Close()
+		return nil, errors.New("Duplicate tunnel name")
+	} else if text == session_DUPLICATE_DEST {
+		log.Error("Duplicate destination")
+		conn.Close()
+		return nil, errors.New("Duplicate destination")
+	} else if text == session_INVALID_KEY {
+		log.Error("Invalid key - Primary Session")
+		conn.Close()
+		return nil, errors.New("Invalid key - Primary Session")
+	} else if strings.HasPrefix(text, session_I2P_ERROR) {
+		log.WithField("error", text[len(session_I2P_ERROR):]).Error("I2P error")
+		conn.Close()
+		return nil, errors.New("I2P error " + text[len(session_I2P_ERROR):])
+	} else {
+		log.WithField("reply", text).Error("Unable to parse SAMv3 reply")
+		conn.Close()
+		return nil, errors.New("Unable to parse SAMv3 reply: " + text)
+	}
+}
+
+// Creates a new StreamSession with the I2CP- and streaminglib options as
+// specified. See the I2P documentation for a full list of options.
+func (sam *PrimarySession) NewStreamSubSession(id string) (*StreamSession, error) {
+	log.WithField("id", id).Debug("NewStreamSubSession called")
+	conn, err := sam.newGenericSubSession("STREAM", id, []string{})
+	if err != nil {
+		log.WithError(err).Error("Failed to create new generic sub-session")
+		return nil, err
+	}
+	return &StreamSession{sam.Config.I2PConfig.Sam(), id, conn, sam.keys, time.Duration(600 * time.Second), time.Now(), Sig_NONE, "0", "0"}, nil
+}
+
+// Creates a new StreamSession with the I2CP- and streaminglib options as
+// specified. See the I2P documentation for a full list of options.
+func (sam *PrimarySession) NewUniqueStreamSubSession(id string) (*StreamSession, error) {
+	log.WithField("id", id).Debug("NewUniqueStreamSubSession called")
+	conn, err := sam.newGenericSubSession("STREAM", id, []string{})
+	if err != nil {
+		log.WithError(err).Error("Failed to create new generic sub-session")
+		return nil, err
+	}
+	fromPort, toPort := randport(), randport()
+	log.WithFields(logrus.Fields{"fromPort": fromPort, "toPort": toPort}).Debug("Generated random ports")
+	// return &StreamSession{sam.Config.I2PConfig.Sam(), id, conn, sam.keys, time.Duration(600 * time.Second), time.Now(), Sig_NONE, randport(), randport()}, nil
+	return &StreamSession{sam.Config.I2PConfig.Sam(), id, conn, sam.keys, time.Duration(600 * time.Second), time.Now(), Sig_NONE, fromPort, toPort}, nil
+}
+
+// Creates a new StreamSession with the I2CP- and streaminglib options as
+// specified. See the I2P documentation for a full list of options.
+func (sam *PrimarySession) NewStreamSubSessionWithPorts(id, from, to string) (*StreamSession, error) {
+	log.WithFields(logrus.Fields{"id": id, "from": from, "to": to}).Debug("NewStreamSubSessionWithPorts called")
+	conn, err := sam.newGenericSubSessionWithSignatureAndPorts("STREAM", id, from, to, []string{})
+	if err != nil {
+		log.WithError(err).Error("Failed to create new generic sub-session with signature and ports")
+		return nil, err
+	}
+	return &StreamSession{sam.Config.I2PConfig.Sam(), id, conn, sam.keys, time.Duration(600 * time.Second), time.Now(), Sig_NONE, from, to}, nil
+}
+
+/*
+func (s *PrimarySession) I2PListener(name string) (*StreamListener, error) {
+	listener, err := s.NewStreamSubSession(name)
+	if err != nil {
+		return nil, err
+	}
+	return listener.Listen()
+}
+*/
+
+// Creates a new datagram session. udpPort is the UDP port SAM is listening on,
+// and if you set it to zero, it will use SAMs standard UDP port.
+func (s *PrimarySession) NewDatagramSubSession(id string, udpPort int, datagramOptions ...DatagramOptions) (*DatagramSession, error) {
+	log.WithFields(logrus.Fields{"id": id, "udpPort": udpPort}).Debug("NewDatagramSubSession called")
+	udpSessionConfig := &common.UDPSessionConfig{
+		Port:          udpPort,
+		ParentConn:    s.conn,
+		Log:           log,
+		DefaultPort:   7655,
+		AllowZeroPort: true,
+		// Add required session parameters
+		Style:        "DATAGRAM",
+		FromPort:     "0", // Allow dynamic port assignment
+		ToPort:       "0",
+		ReadTimeout:  30 * time.Second,
+		WriteTimeout: 30 * time.Second,
+	}
+	udpConn, err := common.NewUDPSession(udpSessionConfig)
+	if err != nil {
+		log.WithError(err).Error("Failed to create UDP session")
+		return nil, err
+	}
+	_, lport, err := net.SplitHostPort(udpConn.Conn.LocalAddr().String())
+	if err != nil {
+		log.WithError(err).Error("Failed to get local port")
+		s.Close()
+		return nil, err
+	}
+	conn, err := s.newGenericSubSession("DATAGRAM", id, []string{"PORT=" + lport})
+	if err != nil {
+		log.WithError(err).Error("Failed to create new generic sub-session")
+		return nil, err
+	}
+	if len(datagramOptions) > 0 {
+		// return &DatagramSession{s.Config.I2PConfig.Sam(), id, conn, udpconn, s.keys, rUDPAddr, nil, &datagramOptions[0]}, nil
+		return &DatagramSession{
+			samAddr:         s.Config.I2PConfig.Sam(),
+			id:              id,
+			conn:            conn,
+			keys:            s.keys,
+			UDPSession:      *udpConn,
+			DatagramOptions: &datagramOptions[0],
+		}, nil
+	}
+	opts := &DatagramOptions{
+		SendTags:     0,
+		TagThreshold: 0,
+		Expires:      0,
+		SendLeaseset: false,
+	}
+	log.WithFields(logrus.Fields{"id": id, "localPort": lport}).Debug("Created new datagram sub-session")
+	// return &DatagramSession{s.Config.I2PConfig.Sam(), id, conn, udpconn, s.keys, rUDPAddr, nil, opts}, nil
+	return &DatagramSession{
+		samAddr:         s.Config.I2PConfig.Sam(),
+		id:              id,
+		conn:            conn,
+		keys:            s.keys,
+		UDPSession:      *udpConn,
+		DatagramOptions: opts,
+	}, nil
+}
+
+// Creates a new raw session. udpPort is the UDP port SAM is listening on,
+// and if you set it to zero, it will use SAMs standard UDP port.
+func (s *PrimarySession) NewRawSubSession(id string, udpPort int) (*RawSession, error) {
+	log.WithFields(logrus.Fields{"id": id, "udpPort": udpPort}).Debug("NewRawSubSession called")
+
+	if udpPort > 65335 || udpPort < 0 {
+		log.WithField("udpPort", udpPort).Error("Invalid UDP port")
+		return nil, errors.New("udpPort needs to be in the intervall 0-65335")
+	}
+	if udpPort == 0 {
+		udpPort = 7655
+		log.Debug("Using default UDP port 7655")
+	}
+	lhost, _, err := SplitHostPort(s.conn.LocalAddr().String())
+	if err != nil {
+		log.WithError(err).Error("Failed to split local host port")
+		s.Close()
+		return nil, err
+	}
+	lUDPAddr, err := net.ResolveUDPAddr("udp4", lhost+":0")
+	if err != nil {
+		log.WithError(err).Error("Failed to resolve local UDP address")
+		return nil, err
+	}
+	udpconn, err := net.ListenUDP("udp4", lUDPAddr)
+	if err != nil {
+		log.WithError(err).Error("Failed to listen on UDP")
+		return nil, err
+	}
+	rhost, _, err := SplitHostPort(s.conn.RemoteAddr().String())
+	if err != nil {
+		log.WithError(err).Error("Failed to split remote host port")
+		s.Close()
+		return nil, err
+	}
+	rUDPAddr, err := net.ResolveUDPAddr("udp4", rhost+":"+strconv.Itoa(udpPort))
+	if err != nil {
+		log.WithError(err).Error("Failed to resolve remote UDP address")
+		return nil, err
+	}
+	_, lport, err := net.SplitHostPort(udpconn.LocalAddr().String())
+	if err != nil {
+		log.WithError(err).Error("Failed to get local port")
+		s.Close()
+		return nil, err
+	}
+	//	conn, err := s.newGenericSubSession("RAW", id, s.keys, options, []string{"PORT=" + lport})
+	conn, err := s.newGenericSubSession("RAW", id, []string{"PORT=" + lport})
+	if err != nil {
+		log.WithError(err).Error("Failed to create new generic sub-session")
+		return nil, err
+	}
+
+	log.WithFields(logrus.Fields{"id": id, "localPort": lport}).Debug("Created new raw sub-session")
+	return &RawSession{s.Config.I2PConfig.Sam(), id, conn, udpconn, s.keys, rUDPAddr}, nil
+}

primary_datagram_test.go

@@ -0,0 +1,148 @@
+package sam3
+
+import (
+	"fmt"
+	"testing"
+	"time"
+)
+
+func Test_PrimaryDatagramServerClient(t *testing.T) {
+	if testing.Short() {
+		return
+	}
+
+	fmt.Println("Test_PrimaryDatagramServerClient")
+	earlysam, err := NewSAM(yoursam)
+	if err != nil {
+		t.Fail()
+		return
+	}
+	defer earlysam.Close()
+	keys, err := earlysam.NewKeys()
+	if err != nil {
+		t.Fail()
+		return
+	}
+
+	sam, err := earlysam.NewPrimarySession("PrimaryTunnel", keys, []string{"inbound.length=0", "outbound.length=0", "inbound.lengthVariance=0", "outbound.lengthVariance=0", "inbound.quantity=1", "outbound.quantity=1"})
+	if err != nil {
+		t.Fail()
+		return
+	}
+	defer sam.Close()
+	//	fmt.Println("\tServer: My address: " + keys.Addr().Base32())
+	fmt.Println("\tServer: Creating tunnel")
+	ds, err := sam.NewDatagramSubSession("PrimaryTunnel"+RandString(), 0)
+	if err != nil {
+		fmt.Println("Server: Failed to create tunnel: " + err.Error())
+		t.Fail()
+		return
+	}
+	defer ds.Close()
+	c, w := make(chan bool), make(chan bool)
+	go func(c, w chan (bool)) {
+		sam2, err := NewSAM(yoursam)
+		if err != nil {
+			c <- false
+			return
+		}
+		defer sam2.Close()
+		keys, err := sam2.NewKeys()
+		if err != nil {
+			c <- false
+			return
+		}
+		fmt.Println("\tClient: Creating tunnel")
+		ds2, err := sam2.NewDatagramSession("PRIMARYClientTunnel", keys, []string{"inbound.length=0", "outbound.length=0", "inbound.lengthVariance=0", "outbound.lengthVariance=0", "inbound.quantity=1", "outbound.quantity=1"}, 0)
+		if err != nil {
+			c <- false
+			return
+		}
+		defer ds2.Close()
+		//		fmt.Println("\tClient: Servers address: " + ds.LocalAddr().Base32())
+		//		fmt.Println("\tClient: Clients address: " + ds2.LocalAddr().Base32())
+		fmt.Println("\tClient: Tries to send primary to server")
+		for {
+			select {
+			default:
+				_, err = ds2.WriteTo([]byte("Hello primary-world! <3 <3 <3 <3 <3 <3"), ds.LocalAddr())
+				if err != nil {
+					fmt.Println("\tClient: Failed to send primary: " + err.Error())
+					c <- false
+					return
+				}
+				time.Sleep(5 * time.Second)
+			case <-w:
+				fmt.Println("\tClient: Sent primary, quitting.")
+				return
+			}
+		}
+		c <- true
+	}(c, w)
+	buf := make([]byte, 512)
+	fmt.Println("\tServer: ReadFrom() waiting...")
+	n, _, err := ds.ReadFrom(buf)
+	w <- true
+	if err != nil {
+		fmt.Println("\tServer: Failed to ReadFrom(): " + err.Error())
+		t.Fail()
+		return
+	}
+	fmt.Println("\tServer: Received primary: " + string(buf[:n]))
+	//	fmt.Println("\tServer: Senders address was: " + saddr.Base32())
+}
+
+func ExamplePrimaryDatagramSession() {
+	// Creates a new PrimarySession, then creates a Datagram subsession on top of it
+
+	const samBridge = "127.0.0.1:7656"
+
+	earlysam, err := NewSAM(samBridge)
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	defer earlysam.Close()
+	keys, err := earlysam.NewKeys()
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	myself := keys.Addr()
+
+	sam, err := earlysam.NewPrimarySession("PrimaryTunnel", keys, []string{"inbound.length=0", "outbound.length=0", "inbound.lengthVariance=0", "outbound.lengthVariance=0", "inbound.quantity=1", "outbound.quantity=1"})
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	defer sam.Close()
+
+	// See the example Option_* variables.
+	dg, err := sam.NewDatagramSubSession("DGTUN"+RandString(), 0)
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	defer dg.Close()
+	someone, err := earlysam.Lookup("zzz.i2p")
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+
+	dg.WriteTo([]byte("Hello stranger!"), someone)
+	dg.WriteTo([]byte("Hello myself!"), myself)
+
+	buf := make([]byte, 31*1024)
+	n, _, err := dg.ReadFrom(buf)
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	fmt.Println("Got message: '" + string(buf[:n]) + "'")
+	fmt.Println("Got message: " + string(buf[:n]))
+
+	return
+	// Output:
+	// Got message: Hello myself!
+}

primary_stream_test.go

@@ -0,0 +1,306 @@
+package sam3
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"strings"
+	"testing"
+	"time"
+)
+
+func Test_PrimaryStreamingDial(t *testing.T) {
+	if testing.Short() {
+		return
+	}
+	fmt.Println("Test_PrimaryStreamingDial")
+	earlysam, err := NewSAM(yoursam)
+	if err != nil {
+		t.Fail()
+		return
+	}
+	defer earlysam.Close()
+	keys, err := earlysam.NewKeys()
+	if err != nil {
+		t.Fail()
+		return
+	}
+
+	sam, err := earlysam.NewPrimarySession("PrimaryTunnel", keys, []string{"inbound.length=0", "outbound.length=0", "inbound.lengthVariance=0", "outbound.lengthVariance=0", "inbound.quantity=1", "outbound.quantity=1"})
+	if err != nil {
+		t.Fail()
+		return
+	}
+	defer sam.Close()
+	fmt.Println("\tBuilding tunnel")
+	ss, err := sam.NewStreamSubSession("primaryStreamTunnel")
+	if err != nil {
+		fmt.Println(err.Error())
+		t.Fail()
+		return
+	}
+	defer ss.Close()
+	fmt.Println("\tNotice: This may fail if your I2P node is not well integrated in the I2P network.")
+	fmt.Println("\tLooking up idk.i2p")
+	forumAddr, err := ss.Lookup("idk.i2p")
+	if err != nil {
+		fmt.Println(err.Error())
+		t.Fail()
+		return
+	}
+	fmt.Println("\tDialing idk.i2p(", forumAddr.Base32(), forumAddr.DestHash().Hash(), ")")
+	conn, err := ss.DialI2P(forumAddr)
+	if err != nil {
+		fmt.Println(err.Error())
+		t.Fail()
+		return
+	}
+	defer conn.Close()
+	fmt.Println("\tSending HTTP GET /")
+	if _, err := conn.Write([]byte("GET /\n")); err != nil {
+		fmt.Println(err.Error())
+		t.Fail()
+		return
+	}
+	buf := make([]byte, 4096)
+	n, err := conn.Read(buf)
+	if !strings.Contains(strings.ToLower(string(buf[:n])), "http") && !strings.Contains(strings.ToLower(string(buf[:n])), "html") {
+		fmt.Printf("\tProbably failed to StreamSession.DialI2P(idk.i2p)? It replied %d bytes, but nothing that looked like http/html", n)
+	} else {
+		fmt.Println("\tRead HTTP/HTML from idk.i2p")
+	}
+}
+
+func Test_PrimaryStreamingServerClient(t *testing.T) {
+	if testing.Short() {
+		return
+	}
+
+	fmt.Println("Test_StreamingServerClient")
+	earlysam, err := NewSAM(yoursam)
+	if err != nil {
+		t.Fail()
+		return
+	}
+	defer earlysam.Close()
+	keys, err := earlysam.NewKeys()
+	if err != nil {
+		t.Fail()
+		return
+	}
+
+	sam, err := earlysam.NewPrimarySession("PrimaryServerClientTunnel", keys, []string{"inbound.length=0", "outbound.length=0", "inbound.lengthVariance=0", "outbound.lengthVariance=0", "inbound.quantity=1", "outbound.quantity=1"})
+	if err != nil {
+		t.Fail()
+		return
+	}
+	defer sam.Close()
+	fmt.Println("\tServer: Creating tunnel")
+	ss, err := sam.NewUniqueStreamSubSession("PrimaryServerClientTunnel")
+	if err != nil {
+		return
+	}
+	defer ss.Close()
+	time.Sleep(time.Second * 10)
+	c, w := make(chan bool), make(chan bool)
+	go func(c, w chan (bool)) {
+		if !(<-w) {
+			return
+		}
+		/*
+		   sam2, err := NewSAM(yoursam)
+		   if err != nil {
+		   	c <- false
+		   	return
+		   }
+		   defer sam2.Close()
+		   keys, err := sam2.NewKeys()
+		   if err != nil {
+		   	c <- false
+		   	return
+		   }
+		*/
+
+		fmt.Println("\tClient: Creating tunnel")
+		ss2, err := sam.NewStreamSubSession("primaryExampleClientTun")
+		if err != nil {
+			c <- false
+			return
+		}
+		defer ss2.Close()
+		fmt.Println("\tClient: Connecting to server")
+		conn, err := ss2.DialI2P(ss.Addr())
+		if err != nil {
+			c <- false
+			return
+		}
+		fmt.Println("\tClient: Connected to tunnel")
+		defer conn.Close()
+		_, err = conn.Write([]byte("Hello world <3 <3 <3 <3 <3 <3"))
+		if err != nil {
+			c <- false
+			return
+		}
+		c <- true
+	}(c, w)
+	l, err := ss.Listen()
+	if err != nil {
+		fmt.Println("ss.Listen(): " + err.Error())
+		t.Fail()
+		w <- false
+		return
+	}
+	defer l.Close()
+	w <- true
+	fmt.Println("\tServer: Accept()ing on tunnel")
+	conn, err := l.Accept()
+	if err != nil {
+		t.Fail()
+		fmt.Println("Failed to Accept(): " + err.Error())
+		return
+	}
+	defer conn.Close()
+	buf := make([]byte, 512)
+	n, err := conn.Read(buf)
+	fmt.Printf("\tClient exited successfully: %t\n", <-c)
+	fmt.Println("\tServer: received from Client: " + string(buf[:n]))
+}
+
+func ExamplePrimaryStreamSession() {
+	// Creates a new StreamingSession, dials to idk.i2p and gets a SAMConn
+	// which behaves just like a normal net.Conn.
+
+	const samBridge = "127.0.0.1:7656"
+
+	earlysam, err := NewSAM(yoursam)
+	if err != nil {
+		log.Fatal(err.Error())
+		return
+	}
+	defer earlysam.Close()
+	keys, err := earlysam.NewKeys()
+	if err != nil {
+		log.Fatal(err.Error())
+		return
+	}
+
+	sam, err := earlysam.NewPrimarySession("PrimaryStreamSessionTunnel", keys, []string{"inbound.length=0", "outbound.length=0", "inbound.lengthVariance=0", "outbound.lengthVariance=0", "inbound.quantity=1", "outbound.quantity=1"})
+	if err != nil {
+		log.Fatal(err.Error())
+		return
+	}
+	defer sam.Close()
+	conn, err := sam.Dial("tcp", "idk.i2p") // someone.Base32())
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	defer conn.Close()
+	fmt.Println("Sending HTTP GET /")
+	if _, err := conn.Write([]byte("GET /\n")); err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	buf := make([]byte, 4096)
+	n, err := conn.Read(buf)
+	if !strings.Contains(strings.ToLower(string(buf[:n])), "http") && !strings.Contains(strings.ToLower(string(buf[:n])), "html") {
+		fmt.Printf("Probably failed to StreamSession.DialI2P(idk.i2p)? It replied %d bytes, but nothing that looked like http/html", n)
+		log.Printf("Probably failed to StreamSession.DialI2P(idk.i2p)? It replied %d bytes, but nothing that looked like http/html", n)
+	} else {
+		fmt.Println("Read HTTP/HTML from idk.i2p")
+		log.Println("Read HTTP/HTML from idk.i2p")
+	}
+	// Output:
+	// Sending HTTP GET /
+	// Read HTTP/HTML from idk.i2p
+}
+
+func ExamplePrimaryStreamListener() {
+	// One server Accept()ing on a StreamListener, and one client that Dials
+	// through I2P to the server. Server writes "Hello world!" through a SAMConn
+	// (which implements net.Conn) and the client prints the message.
+
+	const samBridge = "127.0.0.1:7656"
+
+	var ss *StreamSession
+	go func() {
+		earlysam, err := NewSAM(yoursam)
+		if err != nil {
+			log.Fatal(err.Error())
+			return
+		}
+		defer earlysam.Close()
+		keys, err := earlysam.NewKeys()
+		if err != nil {
+			log.Fatal(err.Error())
+			return
+		}
+		sam, err := earlysam.NewPrimarySession("PrimaryListenerTunnel", keys, []string{"inbound.length=0", "outbound.length=0", "inbound.lengthVariance=0", "outbound.lengthVariance=0", "inbound.quantity=1", "outbound.quantity=1"})
+		if err != nil {
+			log.Fatal(err.Error())
+			return
+		}
+		defer sam.Close()
+		ss, err = sam.NewStreamSubSession("PrimaryListenerServerTunnel2")
+		if err != nil {
+			fmt.Println(err.Error())
+			return
+		}
+		defer ss.Close()
+		l, err := ss.Listen()
+		if err != nil {
+			fmt.Println(err.Error())
+			return
+		}
+		defer l.Close()
+		// fmt.Println("Serving on primary listener", l.Addr().String())
+		if err := http.Serve(l, &exitHandler{}); err != nil {
+			fmt.Println(err.Error())
+		}
+	}()
+	time.Sleep(time.Second * 10)
+	latesam, err := NewSAM(yoursam)
+	if err != nil {
+		log.Fatal(err.Error())
+		return
+	}
+	defer latesam.Close()
+	keys2, err := latesam.NewKeys()
+	if err != nil {
+		log.Fatal(err.Error())
+		return
+	}
+	sc, err := latesam.NewStreamSession("PrimaryListenerClientTunnel2", keys2, []string{"inbound.length=0", "outbound.length=0", "inbound.lengthVariance=0", "outbound.lengthVariance=0", "inbound.quantity=1", "outbound.quantity=1"})
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	defer sc.Close()
+	client := http.Client{
+		Transport: &http.Transport{
+			Dial: sc.Dial,
+		},
+	}
+	// resp, err := client.Get("http://" + "idk.i2p") //ss.Addr().Base32())
+	resp, err := client.Get("http://" + ss.Addr().Base32())
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	defer resp.Body.Close()
+	r, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	fmt.Println("Got response: " + string(r))
+
+	// Output:
+	// Got response: Hello world!
+}
+
+type exitHandler struct{}
+
+func (e *exitHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	w.Write([]byte("Hello world!"))
+}

raw.go

@@ -1,107 +1,154 @@
 package sam3
 
 import (
-	"bytes"
 	"errors"
 	"net"
 	"strconv"
 	"time"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/go-i2p/i2pkeys"
 )
 
 // The RawSession provides no authentication of senders, and there is no sender
-// address attached to datagrams, so all communication is anonymous. The 
+// address attached to datagrams, so all communication is anonymous. The
 // messages send are however still endpoint-to-endpoint encrypted. You
 // need to figure out a way to identify and authenticate clients yourself, iff
-// that is needed. Raw datagrams may be at most 32 kB in size. There is no 
+// that is needed. Raw datagrams may be at most 32 kB in size. There is no
 // overhead of authentication, which is the reason to use this..
 type RawSession struct {
-    samAddr     string             // address to the sam bridge (ipv4:port)
+	samAddr  string          // address to the sam bridge (ipv4:port)
-	id          string             // tunnel name
+	id       string          // tunnel name
-	conn        net.Conn           // connection to sam bridge
+	conn     net.Conn        // connection to sam bridge
-	udpconn     *net.UDPConn       // used to deliver datagrams
+	udpconn  *net.UDPConn    // used to deliver datagrams
-	keys        I2PKeys            // i2p destination keys
+	keys     i2pkeys.I2PKeys // i2p destination keys
-	rUDPAddr    *net.UDPAddr       // the SAM bridge UDP-port
+	rUDPAddr *net.UDPAddr    // the SAM bridge UDP-port
 }
 
-// Creates a new raw session. udpPort is the UDP port SAM is listening on, 
+// Creates a new raw session. udpPort is the UDP port SAM is listening on,
 // and if you set it to zero, it will use SAMs standard UDP port.
-func (s *SAM) NewRawSession(id string, keys I2PKeys, options []string, udpPort int) (*RawSession, error) {
+func (s *SAM) NewRawSession(id string, keys i2pkeys.I2PKeys, options []string, udpPort int) (*RawSession, error) {
+	log.WithFields(logrus.Fields{"id": id, "udpPort": udpPort}).Debug("Creating new RawSession")
+
 	if udpPort > 65335 || udpPort < 0 {
-		return nil, errors.New("udpPort needs to be in the intervall 0-65335")
+		log.WithField("udpPort", udpPort).Error("Invalid UDP port")
+		return nil, errors.New("udpPort needs to be in the interval 0-65335")
 	}
 	if udpPort == 0 {
 		udpPort = 7655
+		log.Debug("Using default UDP port 7655")
 	}
-	lhost, _, err := net.SplitHostPort(s.conn.LocalAddr().String())
+	lhost, _, err := SplitHostPort(s.conn.LocalAddr().String())
 	if err != nil {
+		log.Debug("Using default UDP port 7655")
 		s.Close()
 		return nil, err
 	}
-	lUDPAddr, err := net.ResolveUDPAddr("udp4", lhost + ":0")
+	lUDPAddr, err := net.ResolveUDPAddr("udp4", lhost+":0")
 	if err != nil {
+		log.WithError(err).Error("Failed to resolve local UDP address")
 		return nil, err
 	}
 	udpconn, err := net.ListenUDP("udp4", lUDPAddr)
 	if err != nil {
+		log.WithError(err).Error("Failed to listen on UDP")
 		return nil, err
 	}
-	rhost, _, err := net.SplitHostPort(s.conn.RemoteAddr().String())
+	rhost, _, err := SplitHostPort(s.conn.RemoteAddr().String())
 	if err != nil {
+		log.WithError(err).Error("Failed to split remote host port")
 		s.Close()
 		return nil, err
 	}
-	rUDPAddr, err := net.ResolveUDPAddr("udp4", rhost + ":" + strconv.Itoa(udpPort))
+	rUDPAddr, err := net.ResolveUDPAddr("udp4", rhost+":"+strconv.Itoa(udpPort))
 	if err != nil {
+		log.WithError(err).Error("Failed to resolve remote UDP address")
 		return nil, err
 	}
 	_, lport, err := net.SplitHostPort(udpconn.LocalAddr().String())
-	conn, err := s.newGenericSession("RAW", id, keys, options, []string{"PORT=" + lport})
 	if err != nil {
+		log.WithError(err).Error("Failed to get local port")
 		return nil, err
 	}
-	return &RawSession{s.address, id, conn, udpconn, keys, rUDPAddr}, nil
+	conn, err := s.newGenericSession("RAW", id, keys, options, []string{"PORT=" + lport})
+	if err != nil {
+		log.WithError(err).Error("Failed to create new generic session")
+		return nil, err
+	}
+	log.WithFields(logrus.Fields{
+		"id":            id,
+		"localPort":     lport,
+		"remoteUDPAddr": rUDPAddr,
+	}).Debug("Created new RawSession")
+
+	return &RawSession{s.SAMEmit.I2PConfig.Sam(), id, conn, udpconn, keys, rUDPAddr}, nil
 }
 
-// Reads one raw datagram sent to the destination of the DatagramSession. Returns 
+// Read one raw datagram sent to the destination of the DatagramSession. Returns
 // the number of bytes read. Who sent the raw message can not be determined at
 // this layer - you need to do it (in a secure way!).
 func (s *RawSession) Read(b []byte) (n int, err error) {
+	log.Debug("Attempting to read raw datagram")
 	for {
-		// very basic protection: only accept incomming UDP messages from the IP of the SAM bridge
 		var saddr *net.UDPAddr
 		n, saddr, err = s.udpconn.ReadFromUDP(b)
 		if err != nil {
+			log.WithError(err).Error("Failed to read from UDP")
 			return 0, err
 		}
-		if bytes.Equal(saddr.IP, s.rUDPAddr.IP) {
+
-			continue
+		// Verify source is SAM bridge
+		if saddr.IP.Equal(s.rUDPAddr.IP) && saddr.Port == s.rUDPAddr.Port {
+			log.WithField("bytesRead", n).Debug("Successfully read raw datagram")
+			return n, nil
 		}
-		break
+
+		// Log unexpected source
+		log.Printf("Ignored datagram from unauthorized source: %v", saddr)
+		continue
 	}
-	return n, nil
 }
 
 // Sends one raw datagram to the destination specified. At the time of writing,
 // maximum size is 32 kilobyte, but this may change in the future.
-func (s *RawSession) WriteTo(b []byte, addr I2PAddr) (n int, err error) {
+func (s *RawSession) WriteTo(b []byte, addr i2pkeys.I2PAddr) (n int, err error) {
+	log.WithFields(logrus.Fields{
+		"destAddr": addr.String(),
+		"dataLen":  len(b),
+	}).Debug("Attempting to write raw datagram")
+
 	header := []byte("3.0 " + s.id + " " + addr.String() + "\n")
 	msg := append(header, b...)
 	n, err = s.udpconn.WriteToUDP(msg, s.rUDPAddr)
+	if err != nil {
+		log.WithError(err).Error("Failed to write to UDP")
+	}
+	log.WithField("bytesWritten", n).Debug("Successfully wrote raw datagram")
 	return n, err
 }
 
 // Closes the RawSession.
 func (s *RawSession) Close() error {
+	log.Debug("Closing RawSession")
+
 	err := s.conn.Close()
-	err2 := s.udpconn.Close()
 	if err != nil {
+		log.WithError(err).Error("Failed to close connection")
 		return err
 	}
+
+	err2 := s.udpconn.Close()
+	if err2 != nil {
+		log.WithError(err2).Error("Failed to close UDP connection")
+	}
+
+	log.Debug("RawSession closed")
 	return err2
 }
 
 // Returns the local I2P destination of the RawSession.
-func (s *RawSession) LocalAddr() I2PAddr {
+func (s *RawSession) LocalAddr() i2pkeys.I2PAddr {
 	return s.keys.Addr()
 }
 
@@ -116,5 +163,3 @@ func (s *RawSession) SetReadDeadline(t time.Time) error {
 func (s *RawSession) SetWriteDeadline(t time.Time) error {
 	return s.udpconn.SetWriteDeadline(t)
 }
-
-

resolver.go

@@ -0,0 +1,124 @@
+package sam3
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/go-i2p/i2pkeys"
+)
+
+// SAMResolver handles name resolution for I2P addresses
+type SAMResolver struct {
+    sam *SAM
+}
+
+// ResolveResult represents the possible outcomes of name resolution
+type ResolveResult struct {
+    Address i2pkeys.I2PAddr
+    Error   error
+}
+
+const (
+    defaultTimeout = 30 * time.Second
+    samReplyPrefix = "NAMING REPLY "
+)
+
+// NewSAMResolver creates a resolver from an existing SAM instance
+func NewSAMResolver(parent *SAM) (*SAMResolver, error) {
+    if parent == nil {
+        return nil, fmt.Errorf("parent SAM instance required")
+    }
+    return &SAMResolver{sam: parent}, nil
+}
+
+// NewFullSAMResolver creates a new resolver with its own SAM connection
+func NewFullSAMResolver(address string) (*SAMResolver, error) {
+    sam, err := NewSAM(address)
+    if err != nil {
+        return nil, fmt.Errorf("creating SAM connection: %w", err)
+    }
+    return &SAMResolver{sam: sam}, nil
+}
+
+func (r *SAMResolver) Resolve(name string) (i2pkeys.I2PAddr, error) {
+    return r.ResolveWithContext(context.Background(), name)
+}
+
+// Resolve looks up an I2P address by name with context support
+func (r *SAMResolver) ResolveWithContext(ctx context.Context, name string) (i2pkeys.I2PAddr, error) {
+    if name == "" {
+        return "", fmt.Errorf("name cannot be empty")
+    }
+
+    // Create query
+    query := fmt.Sprintf("NAMING LOOKUP NAME=%s\n", name)
+    
+    // Set up timeout if context doesn't have one
+    if _, hasTimeout := ctx.Deadline(); !hasTimeout {
+        var cancel context.CancelFunc
+        ctx, cancel = context.WithTimeout(ctx, defaultTimeout)
+        defer cancel()
+    }
+
+    // Write query with context awareness
+    if err := r.writeWithContext(ctx, query); err != nil {
+        return "", fmt.Errorf("writing query: %w", err)
+    }
+
+    // Read and parse response
+    return r.readResponse(ctx, name)
+}
+
+func (r *SAMResolver) writeWithContext(ctx context.Context, query string) error {
+    done := make(chan error, 1)
+    
+    go func() {
+        _, err := r.sam.conn.Write([]byte(query))
+        done <- err
+    }()
+
+    select {
+    case err := <-done:
+        return err
+    case <-ctx.Done():
+        return ctx.Err()
+    }
+}
+
+func (r *SAMResolver) readResponse(ctx context.Context, name string) (i2pkeys.I2PAddr, error) {
+    reader := bufio.NewReader(r.sam.conn)
+    
+    // Read first line
+    line, err := reader.ReadString('\n')
+    if err != nil {
+        return "", fmt.Errorf("reading response: %w", err)
+    }
+
+    if !strings.HasPrefix(line, samReplyPrefix) {
+        return "", fmt.Errorf("invalid response format")
+    }
+
+    // Parse response
+    fields := strings.Fields(strings.TrimPrefix(line, samReplyPrefix))
+    for _, field := range fields {
+        switch {
+        case field == "RESULT=OK":
+            continue
+        case field == "RESULT=INVALID_KEY":
+            return "", fmt.Errorf("invalid key")
+        case field == "RESULT=KEY_NOT_FOUND":
+            return "", fmt.Errorf("name not found: %s", name)
+        case field == "NAME="+name:
+            continue
+        case strings.HasPrefix(field, "VALUE="):
+            return i2pkeys.I2PAddr(strings.TrimPrefix(field, "VALUE=")), nil
+        case strings.HasPrefix(field, "MESSAGE="):
+            return "", fmt.Errorf("SAM error: %s", strings.TrimPrefix(field, "MESSAGE="))
+        }
+    }
+
+    return "", fmt.Errorf("unable to resolve %s", name)
+}

sam3.go

@@ -4,17 +4,35 @@ package sam3
 import (
 	"bufio"
 	"bytes"
+	"fmt"
+	"io"
+	"math/rand"
 	"net"
-	"errors"
+	"os"
 	"strings"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/go-i2p/i2pkeys"
+	"github.com/go-i2p/sam3/common"
+	logger "github.com/go-i2p/sam3/log"
 )
 
-
+func init() {
+	logger.InitializeSAM3Logger()
+}
 
 // Used for controlling I2Ps SAMv3.
+// This implements the "Control Socket" for all connections.
 type SAM struct {
-	address     string        // ipv4:port
+	address   string
-	conn        net.Conn
+	conn      net.Conn
+	keys      *i2pkeys.I2PKeys
+	sigType   int
+	formatter *common.SAMFormatter
+	version   common.Version
+	SAMEmit
+	*SAMResolver
 }
 
 const (
@@ -25,165 +43,300 @@ const (
 	session_I2P_ERROR      = "SESSION STATUS RESULT=I2P_ERROR MESSAGE="
 )
 
+const (
+	Sig_NONE                 = "SIGNATURE_TYPE=EdDSA_SHA512_Ed25519"
+	Sig_DSA_SHA1             = "SIGNATURE_TYPE=DSA_SHA1"
+	Sig_ECDSA_SHA256_P256    = "SIGNATURE_TYPE=ECDSA_SHA256_P256"
+	Sig_ECDSA_SHA384_P384    = "SIGNATURE_TYPE=ECDSA_SHA384_P384"
+	Sig_ECDSA_SHA512_P521    = "SIGNATURE_TYPE=ECDSA_SHA512_P521"
+	Sig_EdDSA_SHA512_Ed25519 = "SIGNATURE_TYPE=EdDSA_SHA512_Ed25519"
+)
+
+var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+
+func RandString() string {
+	n := 4
+	b := make([]rune, n)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+	log.WithField("randomString", string(b)).Debug("Generated random string")
+	return string(b)
+}
+
 // Creates a new controller for the I2P routers SAM bridge.
 func NewSAM(address string) (*SAM, error) {
-	conn, err := net.Dial("tcp4", address)
+	log.WithField("address", address).Debug("Creating new SAM instance")
+	s := SAM{
+		address:   address,
+		version:   common.SAM31Version,
+		formatter: common.NewSAMFormatter(common.SAM31Version.String),
+	}
+	// TODO: clean this up
+	conn, err := net.Dial("tcp", address)
 	if err != nil {
-		return nil, err
+		log.WithError(err).Error("Failed to dial SAM address")
+		return nil, fmt.Errorf("error dialing to address '%s': %w", address, err)
 	}
-	if _, err := conn.Write([]byte("HELLO VERSION MIN=3.0 MAX=3.0\n")); err != nil {
+	if _, err := conn.Write(s.SAMEmit.HelloBytes()); err != nil {
-		return nil, err
+		log.WithError(err).Error("Failed to write hello message")
+		conn.Close()
+		return nil, fmt.Errorf("error writing to address '%s': %w", address, err)
 	}
-	buf := make([]byte, 256)
+	/*buf := make([]byte, 256)
-	n, err := conn.Read(buf)
+	n, err := conn.Read(buf)*/
+	reader := bufio.NewReader(conn)
+	response, err := reader.ReadString('\n')
 	if err != nil {
-		return nil, err
+		conn.Close()
+		return nil, fmt.Errorf("error reading SAM response: %w", err)
 	}
-	if string(buf[:n]) == "HELLO REPLY RESULT=OK VERSION=3.0\n" {
+	buf := []byte(response)
-		return &SAM{address, conn}, nil
+	n := len(buf)
+	if strings.Contains(string(buf[:n]), "HELLO REPLY RESULT=OK") {
+		log.Debug("SAM hello successful")
+		s.SAMEmit.I2PConfig.SetSAMAddress(address)
+		s.conn = conn
+		// s.Config.I2PConfig.DestinationKeys = nil
+		s.SAMResolver, err = NewSAMResolver(&s)
+		if err != nil {
+			log.WithError(err).Error("Failed to create SAM resolver")
+			return nil, fmt.Errorf("error creating resolver: %w", err)
+		}
+		return &s, nil
 	} else if string(buf[:n]) == "HELLO REPLY RESULT=NOVERSION\n" {
-		return nil, errors.New("That SAM bridge does not support SAMv3.")
+		log.Error("SAM bridge does not support SAMv3")
+		conn.Close()
+		return nil, fmt.Errorf("That SAM bridge does not support SAMv3.")
 	} else {
-		return nil, errors.New(string(buf[:n]))
+		log.WithField("response", string(buf[:n])).Error("Unexpected SAM response")
+		conn.Close()
+		return nil, fmt.Errorf(string(buf[:n]))
 	}
 }
 
+func (sam *SAM) Keys() (k *i2pkeys.I2PKeys) {
+	// TODO: copy them?
+	log.Debug("Retrieving SAM keys")
+	k = &sam.SAMEmit.I2PConfig.DestinationKeys
+	return
+}
+
+// read public/private keys from an io.Reader
+func (sam *SAM) ReadKeys(r io.Reader) (err error) {
+	log.Debug("Reading keys from io.Reader")
+	var keys i2pkeys.I2PKeys
+	keys, err = i2pkeys.LoadKeysIncompat(r)
+	if err == nil {
+		log.Debug("Keys loaded successfully")
+		sam.SAMEmit.I2PConfig.DestinationKeys = keys
+	}
+	log.WithError(err).Error("Failed to load keys")
+	return
+}
+
+// if keyfile fname does not exist
+func (sam *SAM) EnsureKeyfile(fname string) (keys i2pkeys.I2PKeys, err error) {
+	log.WithError(err).Error("Failed to load keys")
+	if fname == "" {
+		// transient
+		keys, err = sam.NewKeys()
+		if err == nil {
+			sam.SAMEmit.I2PConfig.DestinationKeys = keys
+			log.WithFields(logrus.Fields{
+				"keys": keys,
+			}).Debug("Generated new transient keys")
+		}
+	} else {
+		// persistent
+		_, err = os.Stat(fname)
+		if os.IsNotExist(err) {
+			// make the keys
+			keys, err = sam.NewKeys()
+			if err == nil {
+				sam.SAMEmit.I2PConfig.DestinationKeys = keys
+				// save keys
+				var f io.WriteCloser
+				f, err = os.OpenFile(fname, os.O_WRONLY|os.O_CREATE, 0o600)
+				if err == nil {
+					err = i2pkeys.StoreKeysIncompat(keys, f)
+					f.Close()
+					log.Debug("Generated and saved new keys")
+				}
+			}
+		} else if err == nil {
+			// we haz key file
+			var f *os.File
+			f, err = os.Open(fname)
+			if err == nil {
+				keys, err = i2pkeys.LoadKeysIncompat(f)
+				if err == nil {
+					sam.SAMEmit.I2PConfig.DestinationKeys = keys
+					log.Debug("Loaded existing keys from file")
+				}
+			}
+		}
+	}
+	if err != nil {
+		log.WithError(err).Error("Failed to ensure keyfile")
+	}
+	return
+}
+
 // Creates the I2P-equivalent of an IP address, that is unique and only the one
-// who has the private keys can send messages from. The public keys are the I2P 
+// who has the private keys can send messages from. The public keys are the I2P
 // desination (the address) that anyone can send messages to.
-func (sam *SAM) NewKeys() (I2PKeys, error) {
+
-	if _, err := sam.conn.Write([]byte("DEST GENERATE\n")); err != nil {
+// Add constant for recommended sig type
-		return I2PKeys{}, err
+const (
+	DEFAULT_SIG_TYPE = "SIGNATURE_TYPE=7" // EdDSA_SHA512_Ed25519
+)
+
+func (sam *SAM) NewKeys(sigType ...string) (i2pkeys.I2PKeys, error) {
+	log.WithField("sigType", sigType).Debug("Generating new keys")
+	if sigType == nil {
+		sigType = []string{DEFAULT_SIG_TYPE}
+	}
+	scmsg := []byte(fmt.Sprintf("DEST GENERATE %s\n", sigType[0]))
+	if _, err := sam.conn.Write(scmsg); err != nil {
+		log.WithError(err).Error("Failed to write DEST GENERATE command")
+		return i2pkeys.I2PKeys{}, fmt.Errorf("error with writing in SAM: %w", err)
 	}
 	buf := make([]byte, 8192)
 	n, err := sam.conn.Read(buf)
 	if err != nil {
-		return I2PKeys{}, err
+		log.WithError(err).Error("Failed to read SAM response for key generation")
+		return i2pkeys.I2PKeys{}, fmt.Errorf("error with reading in SAM: %w", err)
 	}
 	s := bufio.NewScanner(bytes.NewReader(buf[:n]))
 	s.Split(bufio.ScanWords)
-	
+
 	var pub, priv string
 	for s.Scan() {
 		text := s.Text()
-		if text == "DEST" { 
+		if text == "DEST" {
-			continue 
+			continue
-		} else if text == "REPLY" { 
+		} else if text == "REPLY" {
-			continue 
+			continue
 		} else if strings.HasPrefix(text, "PUB=") {
 			pub = text[4:]
 		} else if strings.HasPrefix(text, "PRIV=") {
 			priv = text[5:]
 		} else {
-			return I2PKeys{}, errors.New("Failed to parse keys.")
+			log.Error("Failed to parse keys from SAM response")
+			return i2pkeys.I2PKeys{}, fmt.Errorf("Failed to parse keys.")
 		}
 	}
-	return I2PKeys{I2PAddr(pub), priv}, nil
+	log.Debug("Successfully generated new keys")
+	return i2pkeys.NewKeys(i2pkeys.I2PAddr(pub), priv), nil
 }
 
 // Performs a lookup, probably this order: 1) routers known addresses, cached
 // addresses, 3) by asking peers in the I2P network.
-func (sam *SAM) Lookup(name string) (I2PAddr, error) {
+func (sam *SAM) Lookup(name string) (i2pkeys.I2PAddr, error) {
-	if _, err := sam.conn.Write([]byte("NAMING LOOKUP NAME=" + name + "\n")); err != nil {
+	log.WithField("name", name).Debug("Looking up address")
-		return I2PAddr(""), err
+	return sam.SAMResolver.Resolve(name)
-	}
-	buf := make([]byte, 4096)
-	n, err := sam.conn.Read(buf)
-	if err != nil {
-		return I2PAddr(""), err
-	}
-	if n <= 13 || !strings.HasPrefix(string(buf[:n]), "NAMING REPLY ") {
-		return I2PAddr(""), errors.New("Failed to parse.")
-	}
-	s := bufio.NewScanner(bytes.NewReader(buf[13:n]))
-	s.Split(bufio.ScanWords)
-
-	errStr := ""
-	for s.Scan() {
-		text := s.Text()
-		if text == "RESULT=OK" {
-			continue
-		} else if text == "RESULT=INVALID_KEY" {
-			errStr += "Invalid key."
-		} else if text == "RESULT=KEY_NOT_FOUND" {
-			errStr += "Unable to resolve " + name
-		} else if text == "NAME=" + name {
-			continue
-		} else if strings.HasPrefix(text, "VALUE=") {
-			return I2PAddr(text[6:]), nil
-		} else if strings.HasPrefix(text, "MESSAGE=") {
-			errStr += " " + text[8:]
-		} else {
-      continue
-		}
-	}
-	return I2PAddr(""), errors.New(errStr)
 }
 
-// Creates a new session with the style of either "STREAM", "DATAGRAM" or "RAW", 
+// Creates a new session with the style of either "STREAM", "DATAGRAM" or "RAW",
 // for a new I2P tunnel with name id, using the cypher keys specified, with the
 // I2CP/streaminglib-options as specified. Extra arguments can be specified by
 // setting extra to something else than []string{}.
 // This sam3 instance is now a session
-func (sam *SAM) newGenericSession(style, id string, keys I2PKeys, options []string, extras []string) (net.Conn, error) {
+func (sam *SAM) newGenericSession(style, id string, keys i2pkeys.I2PKeys, options, extras []string) (net.Conn, error) {
+	log.WithFields(logrus.Fields{"style": style, "id": id}).Debug("Creating new generic session")
+	return sam.newGenericSessionWithSignature(style, id, keys, Sig_NONE, options, extras)
+}
+
+func (sam *SAM) newGenericSessionWithSignature(style, id string, keys i2pkeys.I2PKeys, sigType string, options, extras []string) (net.Conn, error) {
+	log.WithFields(logrus.Fields{"style": style, "id": id, "sigType": sigType}).Debug("Creating new generic session with signature")
+	return sam.newGenericSessionWithSignatureAndPorts(style, id, "0", "0", keys, sigType, options, extras)
+}
+
+// Creates a new session with the style of either "STREAM", "DATAGRAM" or "RAW",
+// for a new I2P tunnel with name id, using the cypher keys specified, with the
+// I2CP/streaminglib-options as specified. Extra arguments can be specified by
+// setting extra to something else than []string{}.
+// This sam3 instance is now a session
+func (sam *SAM) newGenericSessionWithSignatureAndPorts(style, id, from, to string, keys i2pkeys.I2PKeys, sigType string, options, extras []string) (net.Conn, error) {
+	log.WithFields(logrus.Fields{"style": style, "id": id, "from": from, "to": to, "sigType": sigType}).Debug("Creating new generic session with signature and ports")
+
+	optStr := GenerateOptionString(options)
 
-	optStr := ""
-	for _, opt := range options {
-		optStr += "OPTION=" + opt + " "
-	}
-	
 	conn := sam.conn
-	scmsg := []byte("SESSION CREATE STYLE=" + style + " ID=" + id + " DESTINATION=" + keys.String() + " " + optStr + strings.Join(extras, " ") + "\n")
+	scmsg := []byte(fmt.Sprintf("SESSION CREATE STYLE=%s FROM_PORT=%s TO_PORT=%s ID=%s DESTINATION=%s %s %s\n", style, from, to, id, keys.String(), optStr, strings.Join(extras, " ")))
-	for m, i:=0, 0; m!=len(scmsg); i++ {
+	if style == "PRIMARY" || style == "MASTER" {
+		scmsg = []byte(fmt.Sprintf("SESSION CREATE STYLE=%s ID=%s DESTINATION=%s %s %s\n", style, id, keys.String(), optStr, strings.Join(extras, " ")))
+	}
+
+	log.WithField("message", string(scmsg)).Debug("Sending SESSION CREATE message", string(scmsg))
+
+	for m, i := 0, 0; m != len(scmsg); i++ {
 		if i == 15 {
+			log.Error("Failed to write SESSION CREATE message after 15 attempts")
 			conn.Close()
-			return nil, errors.New("writing to SAM failed")
+			return nil, fmt.Errorf("writing to SAM failed")
 		}
 		n, err := conn.Write(scmsg[m:])
 		if err != nil {
+			log.WithError(err).Error("Failed to write to SAM connection")
 			conn.Close()
-			return nil, err
+			return nil, fmt.Errorf("writing to connection failed: %w", err)
 		}
 		m += n
 	}
 	buf := make([]byte, 4096)
 	n, err := conn.Read(buf)
 	if err != nil {
+		log.WithError(err).Error("Failed to read SAM response")
 		conn.Close()
-		return nil, err
+		return nil, fmt.Errorf("reading from connection failed: %w", err)
 	}
 	text := string(buf[:n])
+	log.WithField("response", text).Debug("Received SAM response")
 	if strings.HasPrefix(text, session_OK) {
 		if keys.String() != text[len(session_OK):len(text)-1] {
-			return nil, errors.New("SAMv3 created a tunnel with keys other than the ones we asked it for")
+			log.Error("SAM created a tunnel with different keys than requested")
+			conn.Close()
+			return nil, fmt.Errorf("SAMv3 created a tunnel with keys other than the ones we asked it for")
 		}
-		return conn, nil //&StreamSession{id, conn, keys, nil, sync.RWMutex{}, nil}, nil 
+		log.Debug("Successfully created new session")
+		return conn, nil //&StreamSession{id, conn, keys, nil, sync.RWMutex{}, nil}, nil
 	} else if text == session_DUPLICATE_ID {
+		log.Error("Duplicate tunnel name")
 		conn.Close()
-		return nil, errors.New("Duplicate tunnel name")
+		return nil, fmt.Errorf("Duplicate tunnel name")
 	} else if text == session_DUPLICATE_DEST {
+		log.Error("Duplicate destination")
 		conn.Close()
-		return nil, errors.New("Duplicate destination")
+		return nil, fmt.Errorf("Duplicate destination")
 	} else if text == session_INVALID_KEY {
+		log.Error("Invalid key for SAM session")
 		conn.Close()
-		return nil, errors.New("Invalid key")
+		return nil, fmt.Errorf("Invalid key - SAM session")
 	} else if strings.HasPrefix(text, session_I2P_ERROR) {
+		log.WithField("error", text[len(session_I2P_ERROR):]).Error("I2P error")
 		conn.Close()
-		return nil, errors.New("I2P error " + text[len(session_I2P_ERROR):])
+		return nil, fmt.Errorf("I2P error %s", text[len(session_I2P_ERROR):])
 	} else {
+		log.WithField("reply", text).Error("Unable to parse SAMv3 reply")
 		conn.Close()
-		return nil, errors.New("Unable to parse SAMv3 reply: " + text)
+		return nil, fmt.Errorf("Unable to parse SAMv3 reply: %s", text)
 	}
 }
 
-// close this sam session
+// Close this sam session
 func (sam *SAM) Close() error {
-	if err := sam.conn.Close(); err != nil {
+	log.Debug("Closing SAM session")
-		return err
+	return sam.conn.Close()
+}
+
+// CloseNotify the socket with a QUIT message
+func (sam *SAM) CloseNotify() error {
+	log.Debug("Quitting SAM session")
+	_, err := sam.conn.Write([]byte("QUIT\n"))
+	if err != nil {
+		return fmt.Errorf("close notification failed: %v", err)
 	}
 	return nil
 }
-
-
-
-

sam3_test.go

@@ -1,29 +1,23 @@
 package sam3
 
-
-
 import (
 	"fmt"
 	"testing"
 	"time"
 )
 
-
-
 const yoursam = "127.0.0.1:7656"
 
-
-
 func Test_Basic(t *testing.T) {
 	fmt.Println("Test_Basic")
 	fmt.Println("\tAttaching to SAM at " + yoursam)
 	sam, err := NewSAM(yoursam)
 	if err != nil {
-		fmt.Println(err.Error)
+		fmt.Println(err.Error())
 		t.Fail()
 		return
 	}
-	
+
 	fmt.Println("\tCreating new keys...")
 	keys, err := sam.NewKeys()
 	if err != nil {
@@ -31,16 +25,16 @@ func Test_Basic(t *testing.T) {
 		t.Fail()
 	} else {
 		fmt.Println("\tAddress created: " + keys.Addr().Base32())
-		fmt.Println("\tI2PKeys: " + string(keys.both)[:50] + "(...etc)")
+		fmt.Println("\tI2PKeys: " + string(keys.String())[:50] + "(...etc)")
 	}
-	
+
 	addr2, err := sam.Lookup("zzz.i2p")
 	if err != nil {
 		fmt.Println(err.Error())
 		t.Fail()
 	} else {
 		fmt.Println("\tzzz.i2p = " + addr2.Base32())
-	}		
+	}
 
 	if err := sam.Close(); err != nil {
 		fmt.Println(err.Error())
@@ -48,7 +42,6 @@ func Test_Basic(t *testing.T) {
 	}
 }
 
-
 /*
 func Test_GenericSession(t *testing.T) {
 	if testing.Short() {
@@ -95,13 +88,6 @@ func Test_GenericSession(t *testing.T) {
 }
 */
 
-
-
-
-
-
-
-
 func Test_RawServerClient(t *testing.T) {
 	if testing.Short() {
 		return
@@ -127,7 +113,7 @@ func Test_RawServerClient(t *testing.T) {
 		return
 	}
 	c, w := make(chan bool), make(chan bool)
-	go func(c, w chan(bool)) { 
+	go func(c, w chan (bool)) {
 		sam2, err := NewSAM(yoursam)
 		if err != nil {
 			c <- false
@@ -149,17 +135,17 @@ func Test_RawServerClient(t *testing.T) {
 		fmt.Println("\tClient: Tries to send raw datagram to server")
 		for {
 			select {
-				default :
+			default:
-					_, err = rs2.WriteTo([]byte("Hello raw-world! <3 <3 <3 <3 <3 <3"), rs.LocalAddr())
+				_, err = rs2.WriteTo([]byte("Hello raw-world! <3 <3 <3 <3 <3 <3"), rs.LocalAddr())
-					if err != nil {
+				if err != nil {
-						fmt.Println("\tClient: Failed to send raw datagram: " + err.Error())
+					fmt.Println("\tClient: Failed to send raw datagram: " + err.Error())
-						c <- false
+					c <- false
-						return
-					}
-					time.Sleep(5 * time.Second)
-				case <-w :
-					fmt.Println("\tClient: Sent raw datagram, quitting.")
 					return
+				}
+				time.Sleep(5 * time.Second)
+			case <-w:
+				fmt.Println("\tClient: Sent raw datagram, quitting.")
+				return
 			}
 		}
 		c <- true
@@ -174,7 +160,5 @@ func Test_RawServerClient(t *testing.T) {
 		return
 	}
 	fmt.Println("\tServer: Received datagram: " + string(buf[:n]))
-//	fmt.Println("\tServer: Senders address was: " + saddr.Base32())
+	//	fmt.Println("\tServer: Senders address was: " + saddr.Base32())
 }
-
-

showhider.css

@@ -0,0 +1,10 @@
+/* edgar showhider CSS file */
+#show {display:none; }
+#hide {display:block; }
+#show:target {display: block; }
+#hide:target {display: none; }
+
+#shownav {display:none; }
+#hidenav {display:block; }
+#shownav:target {display: block; }
+#hidenav:target {display: none; }

stream.go

@@ -3,198 +3,313 @@ package sam3
 import (
 	"bufio"
 	"bytes"
+	"context"
 	"errors"
+	"fmt"
+	"io"
 	"net"
-	"strconv"
 	"strings"
+	"time"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/go-i2p/i2pkeys"
 )
 
 // Represents a streaming session.
 type StreamSession struct {
-    samAddr     string             // address to the sam bridge (ipv4:port)
+	samAddr  string          // address to the sam bridge (ipv4:port)
-	id          string             // tunnel name
+	id       string          // tunnel name
-	conn        net.Conn           // connection to sam bridge
+	conn     net.Conn        // connection to sam
-	keys        I2PKeys            // i2p destination keys
+	keys     i2pkeys.I2PKeys // i2p destination keys
+	Timeout  time.Duration
+	Deadline time.Time
+	sigType  string
+	from     string
+	to       string
+}
+
+// Read reads data from the stream.
+func (s *StreamSession) Read(buf []byte) (int, error) {
+	return s.conn.Read(buf)
+}
+
+// Write sends data over the stream.
+func (s *StreamSession) Write(data []byte) (int, error) {
+	return s.conn.Write(data)
+}
+
+func (s *StreamSession) SetDeadline(t time.Time) error {
+	log.WithField("deadline", t).Debug("Setting deadline for StreamSession")
+	return s.conn.SetDeadline(t)
+}
+
+func (s *StreamSession) SetReadDeadline(t time.Time) error {
+	log.WithField("readDeadline", t).Debug("Setting read deadline for StreamSession")
+	return s.conn.SetReadDeadline(t)
+}
+
+func (s *StreamSession) SetWriteDeadline(t time.Time) error {
+	log.WithField("writeDeadline", t).Debug("Setting write deadline for StreamSession")
+	return s.conn.SetWriteDeadline(t)
+}
+
+func (s *StreamSession) From() string {
+	return s.from
+}
+
+func (s *StreamSession) To() string {
+	return s.to
+}
+
+func (s *StreamSession) SignatureType() string {
+	return s.sigType
 }
 
 // Returns the local tunnel name of the I2P tunnel used for the stream session
-func (ss StreamSession) ID() string {
+func (s *StreamSession) ID() string {
-	return ss.id
+	return s.id
+}
+
+func (s *StreamSession) Close() error {
+	log.WithField("id", s.id).Debug("Closing StreamSession")
+	return s.conn.Close()
 }
 
 // Returns the I2P destination (the address) of the stream session
-func (ss StreamSession) Addr() I2PAddr {
+func (s *StreamSession) Addr() i2pkeys.I2PAddr {
-	return ss.keys.Addr()
+	return s.keys.Addr()
+}
+
+func (s *StreamSession) LocalAddr() net.Addr {
+	return s.keys.Addr()
 }
 
 // Returns the keys associated with the stream session
-func (ss StreamSession) Keys() I2PKeys {
+func (s *StreamSession) Keys() i2pkeys.I2PKeys {
-	return ss.keys
+	return s.keys
 }
 
-// Creates a new StreamSession with the I2CP- and streaminglib options as 
+// Creates a new StreamSession with the I2CP- and streaminglib options as
 // specified. See the I2P documentation for a full list of options.
-func (sam *SAM) NewStreamSession(id string, keys I2PKeys, options []string) (*StreamSession, error) {
+func (sam *SAM) NewStreamSession(id string, keys i2pkeys.I2PKeys, options []string) (*StreamSession, error) {
+	log.WithFields(logrus.Fields{"id": id, "options": options}).Debug("Creating new StreamSession")
 	conn, err := sam.newGenericSession("STREAM", id, keys, options, []string{})
 	if err != nil {
 		return nil, err
 	}
-	return &StreamSession{sam.address, id, conn, keys}, nil
+	log.WithField("id", id).Debug("Created new StreamSession")
+	return &StreamSession{sam.SAMEmit.I2PConfig.Sam(), id, conn, keys, time.Duration(600 * time.Second), time.Now(), Sig_NONE, "0", "0"}, nil
 }
 
-// Dials to an I2P destination and returns a SAMConn, which implements a net.Conn.
+// Creates a new StreamSession with the I2CP- and streaminglib options as
-func (s *StreamSession) DialI2P(addr I2PAddr) (*SAMConn, error) {
+// specified. See the I2P documentation for a full list of options.
-	sam, err := NewSAM(s.samAddr)
+func (sam *SAM) NewStreamSessionWithSignature(id string, keys i2pkeys.I2PKeys, options []string, sigType string) (*StreamSession, error) {
+	log.WithFields(logrus.Fields{"id": id, "options": options, "sigType": sigType}).Debug("Creating new StreamSession with signature")
+	conn, err := sam.newGenericSessionWithSignature("STREAM", id, keys, sigType, options, []string{})
 	if err != nil {
 		return nil, err
 	}
-	conn := sam.conn
+	log.WithFields(logrus.Fields{"id": id, "sigType": sigType}).Debug("Created new StreamSession with signature")
-	_,err = conn.Write([]byte("STREAM CONNECT ID=" + s.id + " DESTINATION=" + addr.Base64() + " SILENT=false\n"))
+	return &StreamSession{sam.SAMEmit.I2PConfig.Sam(), id, conn, keys, time.Duration(600 * time.Second), time.Now(), sigType, "0", "0"}, nil
+}
+
+// Creates a new StreamSession with the I2CP- and streaminglib options as
+// specified. See the I2P documentation for a full list of options.
+func (sam *SAM) NewStreamSessionWithSignatureAndPorts(id, from, to string, keys i2pkeys.I2PKeys, options []string, sigType string) (*StreamSession, error) {
+	log.WithFields(logrus.Fields{"id": id, "from": from, "to": to, "options": options, "sigType": sigType}).Debug("Creating new StreamSession with signature and ports")
+	conn, err := sam.newGenericSessionWithSignatureAndPorts("STREAM", id, from, to, keys, sigType, options, []string{})
 	if err != nil {
 		return nil, err
 	}
+	log.WithFields(logrus.Fields{"id": id, "from": from, "to": to, "sigType": sigType}).Debug("Created new StreamSession with signature and ports")
+	return &StreamSession{sam.SAMEmit.I2PConfig.Sam(), id, conn, keys, time.Duration(600 * time.Second), time.Now(), sigType, from, to}, nil
+}
+
+// lookup name, convenience function
+func (s *StreamSession) Lookup(name string) (i2pkeys.I2PAddr, error) {
+	log.WithField("name", name).Debug("Looking up address")
+	sam, err := NewSAM(s.samAddr)
+	if err == nil {
+		addr, err := sam.Lookup(name)
+		defer sam.Close()
+		if err != nil {
+			log.WithError(err).Error("Lookup failed")
+		} else {
+			log.WithField("addr", addr).Debug("Lookup successful")
+		}
+		return addr, err
+	}
+	log.WithError(err).Error("Failed to create SAM instance for lookup")
+	return i2pkeys.I2PAddr(""), err
+}
+
+// context-aware dialer, eventually...
+func (s *StreamSession) DialContext(ctx context.Context, n, addr string) (net.Conn, error) {
+	log.WithFields(logrus.Fields{"network": n, "addr": addr}).Debug("DialContext called")
+	return s.DialContextI2P(ctx, n, addr)
+}
+
+// context-aware dialer, eventually...
+func (s *StreamSession) DialContextI2P(ctx context.Context, n, addr string) (*SAMConn, error) {
+	log.WithFields(logrus.Fields{"network": n, "addr": addr}).Debug("DialContextI2P called")
+	if ctx == nil {
+		log.Panic("nil context")
+		panic("nil context")
+	}
+	deadline := s.deadline(ctx, time.Now())
+	if !deadline.IsZero() {
+		if d, ok := ctx.Deadline(); !ok || deadline.Before(d) {
+			subCtx, cancel := context.WithDeadline(ctx, deadline)
+			defer cancel()
+			ctx = subCtx
+		}
+	}
+
+	i2paddr, err := i2pkeys.NewI2PAddrFromString(addr)
+	if err != nil {
+		log.WithError(err).Error("Failed to create I2P address from string")
+		return nil, err
+	}
+	return s.DialI2P(i2paddr)
+}
+
+/*
+func (s *StreamSession) Cancel() chan *StreamSession {
+	ch := make(chan *StreamSession)
+	ch <- s
+	return ch
+}*/
+
+func minNonzeroTime(a, b time.Time) time.Time {
+	if a.IsZero() {
+		return b
+	}
+	if b.IsZero() || a.Before(b) {
+		return a
+	}
+	return b
+}
+
+// deadline returns the earliest of:
+//   - now+Timeout
+//   - d.Deadline
+//   - the context's deadline
+//
+// Or zero, if none of Timeout, Deadline, or context's deadline is set.
+func (s *StreamSession) deadline(ctx context.Context, now time.Time) (earliest time.Time) {
+	if s.Timeout != 0 { // including negative, for historical reasons
+		earliest = now.Add(s.Timeout)
+	}
+	if d, ok := ctx.Deadline(); ok {
+		earliest = minNonzeroTime(earliest, d)
+	}
+	return minNonzeroTime(earliest, s.Deadline)
+}
+
+// implement net.Dialer
+func (s *StreamSession) Dial(n, addr string) (c net.Conn, err error) {
+	log.WithFields(logrus.Fields{"network": n, "addr": addr}).Debug("Dial called")
+
+	var i2paddr i2pkeys.I2PAddr
+	var host string
+	host, _, err = SplitHostPort(addr)
+	// log.Println("Dialing:", host)
+	if err = IgnorePortError(err); err == nil {
+		// check for name
+		if strings.HasSuffix(host, ".b32.i2p") || strings.HasSuffix(host, ".i2p") {
+			// name lookup
+			i2paddr, err = s.Lookup(host)
+			log.WithFields(logrus.Fields{"host": host, "i2paddr": i2paddr}).Debug("Looked up I2P address")
+		} else {
+			// probably a destination
+			i2paddr, err = i2pkeys.NewI2PAddrFromBytes([]byte(host))
+			// i2paddr = i2pkeys.I2PAddr(host)
+			// log.Println("Destination:", i2paddr, err)
+			log.WithFields(logrus.Fields{"host": host, "i2paddr": i2paddr}).Debug("Created I2P address from bytes")
+		}
+		if err == nil {
+			return s.DialI2P(i2paddr)
+		}
+	}
+	log.WithError(err).Error("Dial failed")
+	return
+}
+
+// Dials to an I2P destination and returns a SAMConn, which implements a net.Conn.
+func (s *StreamSession) DialI2P(addr i2pkeys.I2PAddr) (*SAMConn, error) {
+	log.WithField("addr", addr).Debug("DialI2P called")
+	sam, err := NewSAM(s.samAddr)
+	if err != nil {
+		log.WithError(err).Error("Failed to create new SAM instance")
+		return nil, err
+	}
+	conn := sam.conn
+	cmd := fmt.Sprintf("STREAM CONNECT ID=%s DESTINATION=%s FROM_PORT=%s TO_PORT=%s SILENT=false\n",
+		s.id,
+		addr.Base64(),
+		s.from,
+		s.to)
+	_, err = conn.Write([]byte(cmd))
+	if err != nil {
+		log.WithError(err).Error("Failed to write STREAM CONNECT command")
+		conn.Close()
+		return nil, err
+	}
 	buf := make([]byte, 4096)
 	n, err := conn.Read(buf)
-	if err != nil {
+	if err != nil && err != io.EOF {
+		log.WithError(err).Error("Failed to write STREAM CONNECT command")
+		conn.Close()
 		return nil, err
 	}
 	scanner := bufio.NewScanner(bytes.NewReader(buf[:n]))
 	scanner.Split(bufio.ScanWords)
 	for scanner.Scan() {
 		switch scanner.Text() {
-		case "STREAM" :
+		case "STREAM":
 			continue
-		case "STATUS" :
+		case "STATUS":
 			continue
-		case "RESULT=OK" :
+		case "RESULT=OK":
-			return &SAMConn{s.keys.addr, addr, conn}, nil
+			log.Debug("Successfully connected to I2P destination")
-		case "RESULT=CANT_REACH_PEER" :
+			return &SAMConn{s.keys.Addr(), addr, conn}, nil
+		case "RESULT=CANT_REACH_PEER":
+			log.Error("Can't reach peer")
+			conn.Close()
 			return nil, errors.New("Can not reach peer")
-		case "RESULT=I2P_ERROR" :
+		case "RESULT=I2P_ERROR":
+			log.Error("I2P internal error")
+			conn.Close()
 			return nil, errors.New("I2P internal error")
-		case "RESULT=INVALID_KEY" :
+		case "RESULT=INVALID_KEY":
-			return nil, errors.New("Invalid key")
+			log.Error("Invalid key - Stream Session")
-		case "RESULT=INVALID_ID" :
+			conn.Close()
+			return nil, errors.New("Invalid key - Stream Session")
+		case "RESULT=INVALID_ID":
+			log.Error("Invalid tunnel ID")
+			conn.Close()
 			return nil, errors.New("Invalid tunnel ID")
-		case "RESULT=TIMEOUT" :
+		case "RESULT=TIMEOUT":
+			log.Error("Connection timeout")
+			conn.Close()
 			return nil, errors.New("Timeout")
-		default :
+		default:
-			return nil, errors.New("Unknown error: " + scanner.Text() + " : " + string(buf[:n]))
+			log.WithField("error", scanner.Text()).Error("Unknown error")
+			conn.Close()
+			return nil, fmt.Errorf("Unknown error: %s : %s", scanner.Text(), string(buf[:n]))
 		}
 	}
+	log.Panic("Unexpected end of StreamSession.DialI2P()")
 	panic("sam3 go library error in StreamSession.DialI2P()")
 }
 
-// Returns a listener for the I2P destination (I2PAddr) associated with the
+// create a new stream listener to accept inbound connections
-// StreamSession.
 func (s *StreamSession) Listen() (*StreamListener, error) {
-	sam, err := NewSAM(s.conn.RemoteAddr().String())
+	log.WithFields(logrus.Fields{"id": s.id, "laddr": s.keys.Addr()}).Debug("Creating new StreamListener")
-	if err != nil {
+	return &StreamListener{
-		return nil, err
+		session: s,
-	}
+		id:      s.id,
-	lhost, _, err := net.SplitHostPort(s.conn.LocalAddr().String())
+		laddr:   s.keys.Addr(),
-	if err != nil {
+	}, nil
-		sam.Close()
-		return nil, err
-	}
-	listener, err := net.Listen("tcp4", lhost + ":0")
-	_, lport, err := net.SplitHostPort(listener.Addr().String())
-	if err != nil {
-		sam.Close()
-		return nil, err
-	}
-	conn := sam.conn
-	_, err = conn.Write([]byte("STREAM FORWARD ID=" + s.id + " PORT=" + lport + " SILENT=false\n"))
-	if err != nil {
-		conn.Close()
-		return nil, err
-	}
-	buf := make([]byte, 512)
-	n, err := conn.Read(buf)
-	if err != nil {
-		conn.Close()
-		return nil, err
-	}
-	scanner := bufio.NewScanner(bytes.NewReader(buf[:n]))
-	scanner.Split(bufio.ScanWords)
-	for scanner.Scan() {
-		switch strings.TrimSpace(scanner.Text()) {
-		case "STREAM" :
-			continue
-		case "STATUS" :
-			continue
-		case "RESULT=OK" :
-			port,_ := strconv.Atoi(lport)
-			return &StreamListener{conn, listener, port, s.keys.Addr()}, nil
-		case "RESULT=I2P_ERROR" :
-			conn.Close()
-			return nil, errors.New("I2P internal error")
-		case "RESULT=INVALID_ID" :
-			conn.Close()
-			return nil, errors.New("Invalid tunnel ID")
-		default :
-			conn.Close()
-			return nil, errors.New("Unknown error: " + scanner.Text() + " : " + string(buf[:n]))
-		}
-	}
-	panic("sam3 go library error in StreamSession.Listener()")
-}
-
-// Implements net.Listener for I2P streaming sessions
-type StreamListener struct {
-	conn        net.Conn
-	listener    net.Listener
-	lport       int
-	laddr       I2PAddr
-}
-
-const defaultListenReadLen = 516
-
-// Accepts incomming connections to your StreamSession tunnel. Implements net.Listener
-func (l *StreamListener) Accept() (*SAMConn, error) {
-	conn, err := l.listener.Accept()
-	if err != nil {
-		return nil, err
-	}
-	buf := make([]byte, defaultListenReadLen)
-	n, err := conn.Read(buf)
-	if n < defaultListenReadLen {
-		return nil, errors.New("Unknown destination type: " + string(buf[:n]))
-	}
-	// I2P inserts the I2P address ("destination") of the connecting peer into the datastream, followed by
-	// a \n. Since the length of a destination may vary, this reads until a newline is found. At the time
-	// of writing, the length is never less then, and almost always equals 516 bytes, which is why 
-	// defaultListenReadLen is 516.
-	if rune(buf[defaultListenReadLen - 1]) != '\n' {
-		abuf := make([]byte, 1)
-		for {
-			n, err := conn.Read(abuf)
-			if n != 1 || err != nil {
-				return nil, errors.New("Failed to decode connecting peers I2P destination.")
-			}
-			buf = append(buf, abuf[0])
-			if rune(abuf[0]) == '\n' { break }
-		}
-	}
-	rAddr, err := NewI2PAddrFromString(string(buf[:len(buf)-1])) // the address minus the trailing newline
-	if err != nil {
-		conn.Close()
-		return nil, errors.New("Could not determine connecting tunnels address.")
-	}
-	return &SAMConn{l.laddr, rAddr, conn}, nil
-}
-
-// Closes the stream session. Implements net.Listener
-func (l *StreamListener) Close() error {
-	err := l.listener.Close()
-	err2 := l.conn.Close()
-	if err2 != nil {
-		return err2
-	}
-	return err
-}
-
-// Returns the I2P destination (address) of the stream session. Implements net.Listener
-func (l *StreamListener) Addr() net.Addr {
-	return l.laddr
 }

streamListener.go

@@ -0,0 +1,178 @@
+package sam3
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"io"
+	"net"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/go-i2p/i2pkeys"
+)
+
+type StreamListener struct {
+	// parent stream session
+	session *StreamSession
+	// our session id
+	id string
+	// our local address for this sam socket
+	laddr i2pkeys.I2PAddr
+}
+
+func (l *StreamListener) From() string {
+	return l.session.from
+}
+
+func (l *StreamListener) To() string {
+	return l.session.to
+}
+
+// get our address
+// implements net.Listener
+func (l *StreamListener) Addr() net.Addr {
+	return l.laddr
+}
+
+// implements net.Listener
+func (l *StreamListener) Close() error {
+	return l.session.Close()
+}
+
+// implements net.Listener
+func (l *StreamListener) Accept() (net.Conn, error) {
+	conn, err := l.AcceptI2P()
+	if err != nil {
+		// Clean up on accept failure
+		if conn != nil {
+			conn.Close()
+		}
+		return nil, err
+	}
+	return conn, nil
+}
+
+func ExtractPairString(input, value string) string {
+	log.WithFields(logrus.Fields{"input": input, "value": value}).Debug("ExtractPairString called")
+	parts := strings.Split(input, " ")
+	for _, part := range parts {
+		if strings.HasPrefix(part, value) {
+			kv := strings.SplitN(input, "=", 2)
+			if len(kv) == 2 {
+				log.WithFields(logrus.Fields{"key": kv[0], "value": kv[1]}).Debug("Pair extracted")
+				return kv[1]
+			}
+		}
+	}
+	log.WithFields(logrus.Fields{"input": input, "value": value}).Debug("No pair found")
+	return ""
+}
+
+func ExtractPairInt(input, value string) int {
+	rv, err := strconv.Atoi(ExtractPairString(input, value))
+	if err != nil {
+		log.WithFields(logrus.Fields{"input": input, "value": value}).Debug("No pair found")
+		return 0
+	}
+	log.WithField("result", rv).Debug("Pair extracted and converted to int")
+	return rv
+}
+
+func ExtractDest(input string) string {
+	log.WithField("input", input).Debug("ExtractDest called")
+	dest := strings.Split(input, " ")[0]
+	log.WithField("dest", dest).Debug("Destination extracted", dest)
+	return strings.Split(input, " ")[0]
+}
+
+// accept a new inbound connection
+func (l *StreamListener) AcceptI2P() (*SAMConn, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	done := make(chan struct{})
+	var conn *SAMConn
+	var err error
+
+	go func() {
+		defer close(done)
+		log.Debug("StreamListener.AcceptI2P() called")
+		s, err := NewSAM(l.session.samAddr)
+		if err == nil {
+			log.Debug("Connected to SAM bridge")
+			// we connected to sam
+			// send accept() command
+			acceptFmt := fmt.Sprintf("STREAM ACCEPT ID=%s SILENT=false", l.id)
+			_, err = io.WriteString(s.conn, acceptFmt)
+			if err != nil {
+				log.WithError(err).Error("Failed to send STREAM ACCEPT command")
+				s.Close()
+			}
+			// read reply
+			rd := bufio.NewReader(s.conn)
+			// read first line
+			line, err := rd.ReadString(10)
+			if err != nil {
+				log.WithError(err).Error("Failed to read SAM bridge response")
+				s.Close()
+				return
+			}
+			log.WithField("response", line).Debug("Received SAM bridge response")
+			log.Println(line)
+			if strings.HasPrefix(line, "STREAM STATUS RESULT=OK") {
+				// we gud read destination line
+				destline, err := rd.ReadString(10)
+				if err != nil {
+					if err == io.EOF {
+						err = fmt.Errorf("connection closed after OK")
+					}
+					err = fmt.Errorf("error reading destination: %s", err.Error())
+				}
+				if err == nil {
+					// Validate destination format
+					dest := ExtractDest(destline)
+					if !strings.HasPrefix(dest, "") {
+						err = fmt.Errorf("invalid destination format")
+					}
+					l.session.from = ExtractPairString(destline, "FROM_PORT")
+					l.session.to = ExtractPairString(destline, "TO_PORT")
+					// return wrapped connection
+					dest = strings.Trim(dest, "\n")
+					log.WithFields(logrus.Fields{
+						"dest": dest,
+						"from": l.session.from,
+						"to":   l.session.to,
+					}).Debug("Accepted new I2P connection")
+					conn = &SAMConn{
+						laddr: l.laddr,
+						raddr: i2pkeys.I2PAddr(dest),
+						Conn:  s.conn,
+					}
+					err = nil
+				} else {
+					log.WithError(err).Error("Failed to read destination line")
+					s.Close()
+					return
+				}
+			} else {
+				log.WithField("line", line).Error("Invalid SAM response")
+				s.Close()
+				err = fmt.Errorf("invalid sam line: %s", line)
+			}
+		} else {
+			log.WithError(err).Error("Failed to connect to SAM bridge")
+			s.Close()
+		}
+	}()
+
+	select {
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	case <-done:
+		return conn, err
+	}
+}

stream_test.go

@@ -4,8 +4,10 @@ import (
 	"fmt"
 	"strings"
 	"testing"
-)
 
+	"github.com/go-i2p/i2pkeys"
+	sam3opts "github.com/go-i2p/sam3/opts"
+)
 
 func Test_StreamingDial(t *testing.T) {
 	if testing.Short() {
@@ -14,7 +16,7 @@ func Test_StreamingDial(t *testing.T) {
 	fmt.Println("Test_StreamingDial")
 	sam, err := NewSAM(yoursam)
 	if err != nil {
-		fmt.Println(err.Error)
+		fmt.Println(err.Error())
 		t.Fail()
 		return
 	}
@@ -26,21 +28,21 @@ func Test_StreamingDial(t *testing.T) {
 		return
 	}
 	fmt.Println("\tBuilding tunnel")
-	ss, err := sam.NewStreamSession("streamTun", keys, []string{"inbound.length=0", "outbound.length=0", "inbound.lengthVariance=0", "outbound.lengthVariance=0", "inbound.quantity=1", "outbound.quantity=1"})
+	ss, err := sam.NewStreamSession("streamTun", keys, []string{"inbound.length=1", "outbound.length=1", "inbound.lengthVariance=0", "outbound.lengthVariance=0", "inbound.quantity=1", "outbound.quantity=1"})
 	if err != nil {
 		fmt.Println(err.Error())
 		t.Fail()
 		return
 	}
 	fmt.Println("\tNotice: This may fail if your I2P node is not well integrated in the I2P network.")
-	fmt.Println("\tLooking up forum.i2p")
+	fmt.Println("\tLooking up i2p-projekt.i2p")
-	forumAddr, err := sam.Lookup("forum.i2p")
+	forumAddr, err := sam.Lookup("i2p-projekt.i2p")
 	if err != nil {
 		fmt.Println(err.Error())
 		t.Fail()
 		return
 	}
-	fmt.Println("\tDialing forum.i2p")
+	fmt.Println("\tDialing i2p-projekt.i2p(", forumAddr.Base32(), forumAddr.DestHash().Hash(), ")")
 	conn, err := ss.DialI2P(forumAddr)
 	if err != nil {
 		fmt.Println(err.Error())
@@ -52,14 +54,14 @@ func Test_StreamingDial(t *testing.T) {
 	if _, err := conn.Write([]byte("GET /\n")); err != nil {
 		fmt.Println(err.Error())
 		t.Fail()
-		return	
+		return
 	}
 	buf := make([]byte, 4096)
 	n, err := conn.Read(buf)
 	if !strings.Contains(strings.ToLower(string(buf[:n])), "http") && !strings.Contains(strings.ToLower(string(buf[:n])), "html") {
-		fmt.Printf("\tProbably failed to StreamSession.DialI2P(forum.i2p)? It replied %d bytes, but nothing that looked like http/html", n)
+		fmt.Printf("\tProbably failed to StreamSession.DialI2P(i2p-projekt.i2p)? It replied %d bytes, but nothing that looked like http/html", n)
 	} else {
-		fmt.Println("\tRead HTTP/HTML from forum.i2p")
+		fmt.Println("\tRead HTTP/HTML from i2p-projekt.i2p")
 	}
 }
 
@@ -67,7 +69,7 @@ func Test_StreamingServerClient(t *testing.T) {
 	if testing.Short() {
 		return
 	}
-	
+
 	fmt.Println("Test_StreamingServerClient")
 	sam, err := NewSAM(yoursam)
 	if err != nil {
@@ -86,7 +88,7 @@ func Test_StreamingServerClient(t *testing.T) {
 		return
 	}
 	c, w := make(chan bool), make(chan bool)
-	go func(c, w chan(bool)) { 
+	go func(c, w chan (bool)) {
 		if !(<-w) {
 			return
 		}
@@ -140,18 +142,17 @@ func Test_StreamingServerClient(t *testing.T) {
 	}
 	defer conn.Close()
 	buf := make([]byte, 512)
-	n,err := conn.Read(buf)
+	n, err := conn.Read(buf)
 	fmt.Printf("\tClient exited successfully: %t\n", <-c)
 	fmt.Println("\tServer: received from Client: " + string(buf[:n]))
 }
 
-
 func ExampleStreamSession() {
-	// Creates a new StreamingSession, dials to zzz.i2p and gets a SAMConn
+	// Creates a new StreamingSession, dials to idk.i2p and gets a SAMConn
 	// which behaves just like a normal net.Conn.
-	
+
 	const samBridge = "127.0.0.1:7656"
-	
+
 	sam, err := NewSAM(samBridge)
 	if err != nil {
 		fmt.Println(err.Error())
@@ -164,17 +165,17 @@ func ExampleStreamSession() {
 		return
 	}
 	// See the example Option_* variables.
-	ss, err := sam.NewStreamSession("stream_example", keys, Options_Small)
+	ss, err := sam.NewStreamSession("stream_example", keys, sam3opts.Options_Small)
 	if err != nil {
 		fmt.Println(err.Error())
 		return
 	}
-	someone, err := sam.Lookup("zzz.i2p")
+	someone, err := sam.Lookup("idk.i2p")
 	if err != nil {
 		fmt.Println(err.Error())
 		return
 	}
-	
+
 	conn, err := ss.DialI2P(someone)
 	if err != nil {
 		fmt.Println(err.Error())
@@ -184,27 +185,29 @@ func ExampleStreamSession() {
 	fmt.Println("Sending HTTP GET /")
 	if _, err := conn.Write([]byte("GET /\n")); err != nil {
 		fmt.Println(err.Error())
-		return	
+		return
 	}
 	buf := make([]byte, 4096)
 	n, err := conn.Read(buf)
 	if !strings.Contains(strings.ToLower(string(buf[:n])), "http") && !strings.Contains(strings.ToLower(string(buf[:n])), "html") {
-		fmt.Printf("Probably failed to StreamSession.DialI2P(zzz.i2p)? It replied %d bytes, but nothing that looked like http/html", n)
+		fmt.Printf("Probably failed to StreamSession.DialI2P(idk.i2p)? It replied %d bytes, but nothing that looked like http/html", n)
+		log.Printf("Probably failed to StreamSession.DialI2P(idk.i2p)? It replied %d bytes, but nothing that looked like http/html", n)
 	} else {
-		fmt.Println("Read HTTP/HTML from zzz.i2p")
+		fmt.Println("Read HTTP/HTML from idk.i2p")
+		log.Println("Read HTTP/HTML from idk.i2p")
 	}
 	return
-	
+
 	// Output:
-	//Sending HTTP GET /
+	// Sending HTTP GET /
-	//Read HTTP/HTML from zzz.i2p
+	// Read HTTP/HTML from idk.i2p
 }
 
 func ExampleStreamListener() {
 	// One server Accept()ing on a StreamListener, and one client that Dials
 	// through I2P to the server. Server writes "Hello world!" through a SAMConn
 	// (which implements net.Conn) and the client prints the message.
-	
+
 	const samBridge = "127.0.0.1:7656"
 
 	sam, err := NewSAM(samBridge)
@@ -213,7 +216,7 @@ func ExampleStreamListener() {
 		return
 	}
 	defer sam.Close()
-	keys, err := sam.NewKeys() 
+	keys, err := sam.NewKeys()
 	if err != nil {
 		fmt.Println(err.Error())
 		return
@@ -222,19 +225,19 @@ func ExampleStreamListener() {
 	quit := make(chan bool)
 
 	// Client connecting to the server
-	go func(server I2PAddr) {
+	go func(server i2pkeys.I2PAddr) {
 		csam, err := NewSAM(samBridge)
 		if err != nil {
 			fmt.Println(err.Error())
 			return
 		}
 		defer csam.Close()
-		keys, err := csam.NewKeys() 
+		keys, err := csam.NewKeys()
 		if err != nil {
 			fmt.Println(err.Error())
 			return
 		}
-		cs, err := csam.NewStreamSession("client_example", keys, Options_Small)
+		cs, err := csam.NewStreamSession("client_example", keys, sam3opts.Options_Small)
 		if err != nil {
 			fmt.Println(err.Error())
 			quit <- false
@@ -255,9 +258,9 @@ func ExampleStreamListener() {
 		}
 		fmt.Println(string(buf[:n]))
 		quit <- true
-	}(keys.Addr())          // end of client
+	}(keys.Addr()) // end of client
 
-	ss, err := sam.NewStreamSession("server_example", keys, Options_Small)
+	ss, err := sam.NewStreamSession("server_example", keys, sam3opts.Options_Small)
 	if err != nil {
 		fmt.Println(err.Error())
 		return
@@ -273,9 +276,9 @@ func ExampleStreamListener() {
 		return
 	}
 	conn.Write([]byte("Hello world!"))
-	
+
 	<-quit // waits for client to die, for example only
-	
+
 	// Output:
-	//Hello world!
+	// Hello world!
 }

style.css

@@ -0,0 +1,157 @@
+/* edgar default CSS file */
+
+body {
+    font-family: "Roboto";
+    font-family: monospace;
+    text-align: justify;
+    background-color: #373636;
+    color: whitesmoke;
+    font-size: 1.15em;
+}
+
+ul {
+    width: 55%;
+    display: block;
+}
+
+ol {
+    width: 55%;
+    display: block;
+}
+
+li {
+    margin-top: 1%;
+}
+
+p {
+    max-width: 90%;
+    margin-top: 1%;
+    margin-left: 3%;
+    margin-right: 3%;
+}
+
+img {
+    float: left;
+    top: 5%;
+    left: 5%;
+    max-width: 60%;
+    display: inline;
+}
+
+.inline {
+    display: inline;
+}
+
+.link-button:focus {
+    outline: none;
+}
+
+.link-button:active {
+    color: red;
+}
+
+code {
+    font-family: monospace;
+    border-radius: 5%;
+    padding: 1%;
+    border-color: darkgray;
+    font-size: .9em;
+}
+
+a {
+    color: #C6D9FE;
+    padding: 1%;
+}
+
+ul li {
+    color: #C6D9FE;
+}
+
+iframe {
+    background: aliceblue;
+    border-radius: 15%;
+    margin: 2%;
+}
+
+.container {
+    width: 36vw;
+    height: 64vh;
+    display: inline-block;
+    margin: 0;
+    padding: 0;
+}
+
+.editor-toolbar a {
+    display: inline-block;
+    text-align: center;
+    text-decoration: none !important;
+    color: whitesmoke !important;
+}
+
+#feed {
+    width: 60vw;
+    height: unset !important;
+    margin: 0;
+    padding: 0;
+    float: right;
+    background-color: #373636;
+    color: whitesmoke;
+    border: #C6D9FE solid 1px;
+}
+
+.thread-post,
+.thread {
+    color: whitesmoke !important;
+    background-color: #373636;
+    border: 1px solid darkgray;
+    font-size: inherit;
+    padding-top: 1%;
+    padding-bottom: 1%;
+}
+
+.thread-post {
+    margin-left: 4%;
+}
+
+input {
+    text-align: center;
+    color: whitesmoke !important;
+    background-color: #373636;
+    border: 1px solid darkgray;
+    font: normal normal normal 14px/1 FontAwesome;
+    font-size: inherit;
+    padding-top: 1%;
+    padding-bottom: 1%;
+}
+
+.thread-hash {
+    text-align: right;
+    color: whitesmoke !important;
+    background-color: #373636;
+    border: 1px solid darkgray;
+    font-size: inherit;
+    padding-top: 1%;
+    padding-bottom: 1%;
+}
+
+.post-body {
+    text-align: left;
+    color: whitesmoke !important;
+    font-size: inherit;
+    padding-top: 1%;
+    padding-bottom: 1%;
+}
+#show {display:none; }
+#hide {display:block; }
+#show:target {display: block; }
+#hide:target {display: none; }
+
+#shownav {display:none; }
+#hidenav {display:block; }
+#shownav:target {display: block; }
+#hidenav:target {display: none; }
+
+#navbar {
+	float: right;
+	width: 10%;
+}

suggestedOptions.go

@@ -1,40 +1,95 @@
 package sam3
 
-// Examples and suggestions for options when creating sessions.
+import (
-var (
+	"fmt"
-	// Suitable options if you are shuffling A LOT of traffic. If unused, this 
+	"net"
-	// will waste your resources.
+	"net/http"
-	Options_Humongous = []string{"inbound.length=3", "outbound.length=3",
+	"os"
-	"inbound.lengthVariance=1", "outbound.lengthVariance=1",
+	"strings"
- 	"inbound.backupQuantity=3", "outbound.backupQuantity=3",
-	"inbound.quantity=6", "outbound.quantity=6"}
- 	
- 	// Suitable for shuffling a lot of traffic.
-	Options_Fat = []string{"inbound.length=3", "outbound.length=3",
-	"inbound.lengthVariance=1", "outbound.lengthVariance=1",
- 	"inbound.backupQuantity=1", "outbound.backupQuantity=1",
-	"inbound.quantity=4", "outbound.quantity=4"}
 
-	// Suitable for shuffling medium amounts of traffic.
+	logger "github.com/go-i2p/sam3/log"
-	Options_Medium = []string{"inbound.length=3", "outbound.length=3",
+	sam3opts "github.com/go-i2p/sam3/opts"
-	"inbound.lengthVariance=1", "outbound.lengthVariance=1",
+	"github.com/sirupsen/logrus"
- 	"inbound.backupQuantity=0", "outbound.backupQuantity=0",
-	"inbound.quantity=2", "outbound.quantity=2"}
-
-	// Suitable only for small dataflows, and very short lasting connections:
-	// You only have one tunnel in each direction, so if any of the nodes 
-	// through which any of your two tunnels pass through go offline, there will
-	// be a complete halt in the dataflow, until a new tunnel is built.
-	Options_Small = []string{"inbound.length=3", "outbound.length=3",
-	"inbound.lengthVariance=1", "outbound.lengthVariance=1",
- 	"inbound.backupQuantity=0", "outbound.backupQuantity=0",
-	"inbound.quantity=1", "outbound.quantity=1"}
-
-	// Does not use any anonymization, you connect directly to others tunnel
-	// endpoints, thus revealing your identity but not theirs. Use this only
-	// if you don't care.
-	Options_Warning_ZeroHop = []string{"inbound.length=0", "outbound.length=0",
-	"inbound.lengthVariance=0", "outbound.lengthVariance=0",
- 	"inbound.backupQuantity=0", "outbound.backupQuantity=0",
-	"inbound.quantity=2", "outbound.quantity=2"}
 )
+
+func PrimarySessionString() string {
+	log.Debug("Determining primary session type")
+	_, err := http.Get("http://127.0.0.1:7070")
+	if err != nil {
+		log.WithError(err).Debug("Failed to connect to 127.0.0.1:7070, trying 127.0.0.1:7657")
+		_, err := http.Get("http://127.0.0.1:7657")
+		if err != nil {
+			return "MASTER"
+		}
+		log.Debug("Connected to 127.0.0.1:7657, attempting to create a PRIMARY session")
+		// at this point we're probably running on Java I2P and thus probably
+		// have a PRIMARY session. Just to be sure, try to make one, check
+		// for errors, then immediately close it.
+		testSam, err := NewSAM(SAMDefaultAddr(""))
+		if err != nil {
+			log.WithError(err).Debug("Failed to create SAM instance, assuming MASTER session")
+			return "MASTER"
+		}
+		newKeys, err := testSam.NewKeys()
+		if err != nil {
+			log.WithError(err).Debug("Failed to create new keys, assuming MASTER session")
+			return "MASTER"
+		}
+		primarySession, err := testSam.newPrimarySession("PRIMARY", "primaryTestTunnel", newKeys, sam3opts.Options_Small)
+		if err != nil {
+			log.WithError(err).Debug("Failed to create primary session, assuming MASTER session")
+			return "MASTER"
+		}
+		primarySession.Close()
+		log.Debug("Successfully created and closed a PRIMARY session")
+		return "PRIMARY"
+	}
+	log.Debug("Connected to 127.0.0.1:7070, assuming MASTER session")
+	return "MASTER"
+}
+
+var PrimarySessionSwitch string = PrimarySessionString()
+
+func getEnv(key, fallback string) string {
+	logger.InitializeSAM3Logger()
+	value, ok := os.LookupEnv(key)
+	if !ok {
+		log.WithFields(logrus.Fields{
+			"key":      key,
+			"fallback": fallback,
+		}).Debug("Environment variable not set, using fallback")
+		return fallback
+	}
+	log.WithFields(logrus.Fields{
+		"key":   key,
+		"value": value,
+	}).Debug("Retrieved environment variable")
+	return value
+}
+
+var (
+	SAM_HOST = getEnv("sam_host", "127.0.0.1")
+	SAM_PORT = getEnv("sam_port", "7656")
+)
+
+func SAMDefaultAddr(fallforward string) string {
+	if fallforward == "" {
+		addr := net.JoinHostPort(SAM_HOST, SAM_PORT)
+		log.WithField("addr", addr).Debug("Using default SAM address")
+		return addr
+	}
+	log.WithField("addr", fallforward).Debug("Using fallforward SAM address")
+	return fallforward
+}
+
+func GenerateOptionString(opts []string) string {
+	optStr := strings.Join(opts, " ")
+	log.WithField("options", optStr).Debug("Generating option string")
+	if strings.Contains(optStr, "i2cp.leaseSetEncType") {
+		log.Debug("i2cp.leaseSetEncType already present in options")
+		return optStr
+	}
+	finalOpts := fmt.Sprintf("%s i2cp.leaseSetEncType=4,0", optStr)
+	log.WithField("finalOptions", finalOpts).Debug("Added default i2cp.leaseSetEncType to options")
+	return finalOpts
+}