sing-box/outbound/proxy.go

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package outbound
import (
"context"
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"crypto/rand"
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"encoding/hex"
"net"
"github.com/sagernet/sing-box/adapter"
"github.com/sagernet/sing-box/log"
"github.com/sagernet/sing/common"
"github.com/sagernet/sing/common/auth"
E "github.com/sagernet/sing/common/exceptions"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
"github.com/sagernet/sing/protocol/socks"
)
type ProxyListener struct {
ctx context.Context
logger log.ContextLogger
dialer N.Dialer
tcpListener *net.TCPListener
username string
password string
authenticator *auth.Authenticator
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}
func NewProxyListener(ctx context.Context, logger log.ContextLogger, dialer N.Dialer) *ProxyListener {
var usernameB [64]byte
var passwordB [64]byte
rand.Read(usernameB[:])
rand.Read(passwordB[:])
username := hex.EncodeToString(usernameB[:])
password := hex.EncodeToString(passwordB[:])
return &ProxyListener{
ctx: ctx,
logger: logger,
dialer: dialer,
authenticator: auth.NewAuthenticator([]auth.User{{Username: username, Password: password}}),
username: username,
password: password,
}
}
func (l *ProxyListener) Start() error {
tcpListener, err := net.ListenTCP("tcp", &net.TCPAddr{
IP: net.IPv4(127, 0, 0, 1),
})
if err != nil {
return err
}
l.tcpListener = tcpListener
go l.acceptLoop()
return nil
}
func (l *ProxyListener) Port() uint16 {
if l.tcpListener == nil {
panic("start listener first")
}
return M.SocksaddrFromNet(l.tcpListener.Addr()).Port
}
func (l *ProxyListener) Username() string {
return l.username
}
func (l *ProxyListener) Password() string {
return l.password
}
func (l *ProxyListener) Close() error {
return common.Close(l.tcpListener)
}
func (l *ProxyListener) acceptLoop() {
for {
tcpConn, err := l.tcpListener.AcceptTCP()
if err != nil {
return
}
ctx := log.ContextWithNewID(l.ctx)
go func() {
hErr := l.accept(ctx, tcpConn)
if hErr != nil {
if E.IsClosedOrCanceled(hErr) {
l.logger.DebugContext(ctx, E.Cause(hErr, "proxy connection closed"))
return
}
l.logger.ErrorContext(ctx, E.Cause(hErr, "proxy"))
}
}()
}
}
func (l *ProxyListener) accept(ctx context.Context, conn *net.TCPConn) error {
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return socks.HandleConnection(ctx, conn, l.authenticator, l, M.Metadata{})
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}
func (l *ProxyListener) NewConnection(ctx context.Context, conn net.Conn, upstreamMetadata M.Metadata) error {
var metadata adapter.InboundContext
metadata.Network = N.NetworkTCP
metadata.Destination = upstreamMetadata.Destination
l.logger.InfoContext(ctx, "proxy connection to ", metadata.Destination)
return NewConnection(ctx, l.dialer, conn, metadata)
}
func (l *ProxyListener) NewPacketConnection(ctx context.Context, conn N.PacketConn, upstreamMetadata M.Metadata) error {
var metadata adapter.InboundContext
metadata.Network = N.NetworkUDP
metadata.Destination = upstreamMetadata.Destination
l.logger.InfoContext(ctx, "proxy packet connection to ", metadata.Destination)
return NewPacketConnection(ctx, l.dialer, conn, metadata)
}