/
garlic.go
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/
garlic.go
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//go:build !gen
// +build !gen
package onramp
import (
"context"
"crypto/tls"
"fmt"
"log"
"net"
"os"
"path/filepath"
"strings"
"github.com/eyedeekay/i2pkeys"
"github.com/eyedeekay/sam3"
)
// Garlic is a ready-made I2P streaming manager. Once initialized it always
// has a valid I2PKeys and StreamSession.
type Garlic struct {
*sam3.StreamListener
*sam3.StreamSession
*sam3.DatagramSession
ServiceKeys *i2pkeys.I2PKeys
*sam3.SAM
name string
addr string
opts []string
AddrMode int
TorrentMode bool
}
const (
DEST_BASE32 = 0
DEST_HASH = 1
DEST_HASH_BYTES = 2
DEST_BASE32_TRUNCATED = 3
DEST_BASE64 = 4
DEST_BASE64_BYTES = 5
)
func (g *Garlic) Network() string {
if g.StreamListener != nil {
return "tcp"
} else {
return "udp"
}
}
func (g *Garlic) addrString(addr string) string {
if g.TorrentMode {
return addr + ".i2p"
}
return addr
}
func (g *Garlic) String() string {
var r string
switch g.AddrMode {
case DEST_HASH:
r = g.ServiceKeys.Address.DestHash().Hash()
case DEST_HASH_BYTES:
hash := g.ServiceKeys.Address.DestHash()
r = string(hash[:])
case DEST_BASE32_TRUNCATED:
r = strings.TrimSuffix(g.ServiceKeys.Address.Base32(), ".b32.i2p")
case DEST_BASE32:
r = g.ServiceKeys.Address.Base32()
case DEST_BASE64:
r = g.ServiceKeys.Address.Base64()
case DEST_BASE64_BYTES:
r = string(g.ServiceKeys.Address.Bytes())
default:
r = g.ServiceKeys.Address.DestHash().Hash()
}
return g.addrString(r) //r //strings.TrimLeft(strings.TrimRight(r, "\n"), "\n") //strings.TrimSpace(r)
}
func (g *Garlic) getName() string {
if g.name == "" {
return "onramp-garlic"
}
return g.name
}
func (g *Garlic) getAddr() string {
if g.addr == "" {
return "localhost:7656"
}
return g.addr
}
func (g *Garlic) getOptions() []string {
if g.opts == nil {
return OPT_DEFAULTS
}
return g.opts
}
func (g *Garlic) samSession() (*sam3.SAM, error) {
if g.SAM == nil {
var err error
g.SAM, err = sam3.NewSAM(g.getAddr())
if err != nil {
return nil, fmt.Errorf("onramp samSession: %v", err)
}
}
return g.SAM, nil
}
func (g *Garlic) setupStreamSession() (*sam3.StreamSession, error) {
if g.StreamSession == nil {
var err error
g.ServiceKeys, err = g.Keys()
if err != nil {
return nil, fmt.Errorf("onramp setupStreamSession: %v", err)
}
log.Println("Creating stream session with keys:", g.ServiceKeys.Address.Base32())
g.StreamSession, err = g.SAM.NewStreamSession(g.getName(), *g.ServiceKeys, g.getOptions())
if err != nil {
return nil, fmt.Errorf("onramp setupStreamSession: %v", err)
}
return g.StreamSession, nil
}
return g.StreamSession, nil
}
func (g *Garlic) setupDatagramSession() (*sam3.DatagramSession, error) {
if g.DatagramSession == nil {
var err error
g.ServiceKeys, err = g.Keys()
if err != nil {
return nil, fmt.Errorf("onramp setupDatagramSession: %v", err)
}
log.Println("Creating datagram session with keys:", g.ServiceKeys.Address.Base32())
g.DatagramSession, err = g.SAM.NewDatagramSession(g.getName(), *g.ServiceKeys, g.getOptions(), 0)
if err != nil {
return nil, fmt.Errorf("onramp setupDatagramSession: %v", err)
}
return g.DatagramSession, nil
}
return g.DatagramSession, nil
}
// NewListener returns a net.Listener for the Garlic structure's I2P keys.
// accepts a variable list of arguments, arguments after the first one are ignored.
func (g *Garlic) NewListener(n, addr string) (net.Listener, error) {
return g.Listen(n)
}
// Listen returns a net.Listener for the Garlic structure's I2P keys.
// accepts a variable list of arguments, arguments after the first one are ignored.
func (g *Garlic) Listen(args ...string) (net.Listener, error) {
return g.OldListen(args...)
}
// OldListen returns a net.Listener for the Garlic structure's I2P keys.
// accepts a variable list of arguments, arguments after the first one are ignored.
func (g *Garlic) OldListen(args ...string) (net.Listener, error) {
if len(args) > 0 {
if args[0] == "tcp" || args[0] == "tcp6" || args[0] == "st" || args[0] == "st6" {
return g.ListenStream()
} else if args[0] == "udp" || args[0] == "udp6" || args[0] == "dg" || args[0] == "dg6" {
pk, err := g.ListenPacket()
if err != nil {
return nil, err
}
return pk.(*sam3.DatagramSession), nil
}
}
return g.ListenStream()
}
// Listen returns a net.Listener for the Garlic structure's I2P keys.
func (g *Garlic) ListenStream() (net.Listener, error) {
var err error
if g.SAM, err = g.samSession(); err != nil {
return nil, fmt.Errorf("onramp NewGarlic: %v", err)
}
if g.StreamSession, err = g.setupStreamSession(); err != nil {
return nil, fmt.Errorf("onramp Listen: %v", err)
}
if g.StreamListener == nil {
g.StreamListener, err = g.StreamSession.Listen()
if err != nil {
return nil, fmt.Errorf("onramp Listen: %v", err)
}
}
return g.StreamListener, nil
}
// ListenPacket returns a net.PacketConn for the Garlic structure's I2P keys.
func (g *Garlic) ListenPacket() (net.PacketConn, error) {
var err error
if g.SAM, err = g.samSession(); err != nil {
return nil, fmt.Errorf("onramp NewGarlic: %v", err)
}
if g.DatagramSession, err = g.setupDatagramSession(); err != nil {
return nil, fmt.Errorf("onramp Listen: %v", err)
}
return g.DatagramSession, nil
}
// ListenTLS returns a net.Listener for the Garlic structure's I2P keys,
// which also uses TLS either for additional encryption, authentication,
// or browser-compatibility.
func (g *Garlic) ListenTLS(args ...string) (net.Listener, error) {
listener, err := g.Listen(args...)
if err != nil {
return nil, err
}
cert, err := g.TLSKeys()
if err != nil {
return nil, fmt.Errorf("onramp ListenTLS: %v", err)
}
if len(args) > 0 {
if args[0] == "tcp" || args[0] == "tcp6" || args[0] == "st" || args[0] == "st6" {
return tls.NewListener(
g.StreamListener,
&tls.Config{
Certificates: []tls.Certificate{cert},
},
), nil
} else if args[0] == "udp" || args[0] == "udp6" || args[0] == "dg" || args[0] == "dg6" {
return tls.NewListener(
g.DatagramSession,
&tls.Config{
Certificates: []tls.Certificate{cert},
},
), nil
}
} else {
g.StreamListener = listener.(*sam3.StreamListener)
}
return tls.NewListener(
g.StreamListener,
&tls.Config{
Certificates: []tls.Certificate{cert},
},
), nil
}
// Dial returns a net.Conn for the Garlic structure's I2P keys.
func (g *Garlic) Dial(net, addr string) (net.Conn, error) {
if !strings.Contains(addr, ".i2p") {
return &NullConn{}, nil
}
var err error
if g.SAM, err = g.samSession(); err != nil {
return nil, fmt.Errorf("onramp NewGarlic: %v", err)
}
if g.StreamSession, err = g.setupStreamSession(); err != nil {
return nil, fmt.Errorf("onramp Dial: %v", err)
}
return g.StreamSession.Dial(net, addr)
}
// DialContext returns a net.Conn for the Garlic structure's I2P keys.
func (g *Garlic) DialContext(ctx context.Context, net, addr string) (net.Conn, error) {
if !strings.Contains(addr, ".i2p") {
return &NullConn{}, nil
}
var err error
if g.SAM, err = g.samSession(); err != nil {
return nil, fmt.Errorf("onramp NewGarlic: %v", err)
}
if g.StreamSession, err = g.setupStreamSession(); err != nil {
return nil, fmt.Errorf("onramp Dial: %v", err)
}
return g.StreamSession.DialContext(ctx, net, addr)
}
// Close closes the Garlic structure's sessions and listeners.
func (g *Garlic) Close() error {
e1 := g.StreamSession.Close()
var err error
if e1 != nil {
err = fmt.Errorf("onramp Close: %v", e1)
}
e2 := g.SAM.Close()
if e2 != nil {
err = fmt.Errorf("onramp Close: %v %v", e1, e2)
}
return err
}
// Keys returns the I2PKeys for the Garlic structure. If none
// exist, they are created and stored.
func (g *Garlic) Keys() (*i2pkeys.I2PKeys, error) {
keys, err := I2PKeys(g.getName(), g.getAddr())
if err != nil {
return &i2pkeys.I2PKeys{}, fmt.Errorf("onramp Keys: %v", err)
}
return &keys, nil
}
func (g *Garlic) DeleteKeys() error {
return DeleteGarlicKeys(g.getName())
}
// NewGarlic returns a new Garlic struct. It is immediately ready to use with
// I2P streaming.
func NewGarlic(tunName, samAddr string, options []string) (*Garlic, error) {
g := new(Garlic)
g.name = tunName
g.addr = samAddr
g.opts = options
var err error
if g.SAM, err = g.samSession(); err != nil {
return nil, fmt.Errorf("onramp NewGarlic: %v", err)
}
if g.StreamSession, err = g.setupStreamSession(); err != nil {
return nil, fmt.Errorf("onramp NewGarlic: %v", err)
}
return g, nil
}
// DeleteGarlicKeys deletes the key file at the given path as determined by
// keystore + tunName.
// This is permanent and irreversible, and will change the onion service
// address.
func DeleteGarlicKeys(tunName string) error {
keystore, err := I2PKeystorePath()
if err != nil {
return fmt.Errorf("onramp DeleteGarlicKeys: discovery error %v", err)
}
keyspath := filepath.Join(keystore, tunName+".i2p.private")
if err := os.Remove(keyspath); err != nil {
return fmt.Errorf("onramp DeleteGarlicKeys: %v", err)
}
return nil
}
// I2PKeys returns the I2PKeys at the keystore directory for the given
// tunnel name. If none exist, they are created and stored.
func I2PKeys(tunName, samAddr string) (i2pkeys.I2PKeys, error) {
keystore, err := I2PKeystorePath()
if err != nil {
return i2pkeys.I2PKeys{}, fmt.Errorf("onramp I2PKeys: discovery error %v", err)
}
keyspath := filepath.Join(keystore, tunName+".i2p.private")
info, err := os.Stat(keyspath)
if info != nil {
if info.Size() == 0 {
log.Println("onramp I2PKeys: keystore empty, re-generating keys")
}
}
if err != nil {
sam, err := sam3.NewSAM(samAddr)
if err != nil {
return i2pkeys.I2PKeys{}, fmt.Errorf("onramp I2PKeys: SAM error %v", err)
}
keys, err := sam.NewKeys(tunName)
if err != nil {
return i2pkeys.I2PKeys{}, fmt.Errorf("onramp I2PKeys: keygen error %v", err)
}
if err = i2pkeys.StoreKeys(keys, keyspath); err != nil {
return i2pkeys.I2PKeys{}, fmt.Errorf("onramp I2PKeys: store error %v", err)
}
return keys, nil
} else {
keys, err := i2pkeys.LoadKeys(keyspath)
if err != nil {
return i2pkeys.I2PKeys{}, fmt.Errorf("onramp I2PKeys: load error %v", err)
}
return keys, nil
}
}
var garlics map[string]*Garlic
// CloseAllGarlic closes all garlics managed by the onramp package. It does not
// affect objects instantiated by an app.
func CloseAllGarlic() {
for i, g := range garlics {
log.Println("Closing garlic", g.name)
CloseGarlic(i)
}
}
// CloseGarlic closes the Garlic at the given index. It does not affect Garlic
// objects instantiated by an app.
func CloseGarlic(tunName string) {
g, ok := garlics[tunName]
if ok {
g.Close()
}
}
// SAM_ADDR is the default I2P SAM address. It can be overridden by the
// struct or by changing this variable.
var SAM_ADDR = "127.0.0.1:7656"
// ListenGarlic returns a net.Listener for a garlic structure's keys
// corresponding to a structure managed by the onramp library
// and not instantiated by an app.
func ListenGarlic(network, keys string) (net.Listener, error) {
g, err := NewGarlic(keys, SAM_ADDR, OPT_DEFAULTS)
if err != nil {
return nil, fmt.Errorf("onramp Listen: %v", err)
}
garlics[keys] = g
return g.Listen()
}
// DialGarlic returns a net.Conn for a garlic structure's keys
// corresponding to a structure managed by the onramp library
// and not instantiated by an app.
func DialGarlic(network, addr string) (net.Conn, error) {
g, err := NewGarlic(addr, SAM_ADDR, OPT_DEFAULTS)
if err != nil {
return nil, fmt.Errorf("onramp Dial: %v", err)
}
garlics[addr] = g
return g.Dial(network, addr)
}