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Copy pathsocks.go
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Copy pathsocks.go
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2079 lines (1775 loc) · 50.4 KB
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package gost
import (
"bytes"
"context"
"crypto/tls"
"errors"
"fmt"
"io"
"net"
"net/url"
"strconv"
"sync"
"time"
"github.com/ginuerzh/gosocks4"
"github.com/ginuerzh/gosocks5"
"github.com/go-log/log"
smux "gopkg.in/xtaci/smux.v1"
)
const (
// MethodTLS is an extended SOCKS5 method with tls encryption support.
MethodTLS uint8 = 0x80
// MethodTLSAuth is an extended SOCKS5 method with tls encryption and authentication support.
MethodTLSAuth uint8 = 0x82
// MethodMux is an extended SOCKS5 method for stream multiplexing.
MethodMux = 0x88
)
const (
// CmdMuxBind is an extended SOCKS5 request CMD for
// multiplexing transport with the binding server.
CmdMuxBind uint8 = 0xF2
// CmdUDPTun is an extended SOCKS5 request CMD for UDP over TCP.
CmdUDPTun uint8 = 0xF3
)
var (
_ net.PacketConn = (*socks5UDPTunnelConn)(nil)
)
type clientSelector struct {
methods []uint8
User *url.Userinfo
TLSConfig *tls.Config
}
func (selector *clientSelector) Methods() []uint8 {
if Debug {
log.Log("[socks5] methods:", selector.methods)
}
return selector.methods
}
func (selector *clientSelector) AddMethod(methods ...uint8) {
selector.methods = append(selector.methods, methods...)
}
func (selector *clientSelector) Select(methods ...uint8) (method uint8) {
return
}
func (selector *clientSelector) OnSelected(method uint8, conn net.Conn) (net.Conn, error) {
if Debug {
log.Log("[socks5] method selected:", method)
}
switch method {
case MethodTLS:
conn = tls.Client(conn, selector.TLSConfig)
case gosocks5.MethodUserPass, MethodTLSAuth:
if method == MethodTLSAuth {
conn = tls.Client(conn, selector.TLSConfig)
}
var username, password string
if selector.User != nil {
username = selector.User.Username()
password, _ = selector.User.Password()
}
req := gosocks5.NewUserPassRequest(gosocks5.UserPassVer, username, password)
if err := req.Write(conn); err != nil {
log.Log("[socks5]", err)
return nil, err
}
if Debug {
log.Log("[socks5]", req)
}
resp, err := gosocks5.ReadUserPassResponse(conn)
if err != nil {
log.Log("[socks5]", err)
return nil, err
}
if Debug {
log.Log("[socks5]", resp)
}
if resp.Status != gosocks5.Succeeded {
return nil, gosocks5.ErrAuthFailure
}
case gosocks5.MethodNoAcceptable:
return nil, gosocks5.ErrBadMethod
}
return conn, nil
}
type serverSelector struct {
methods []uint8
// Users []*url.Userinfo
Authenticator Authenticator
TLSConfig *tls.Config
}
func (selector *serverSelector) Methods() []uint8 {
return selector.methods
}
func (selector *serverSelector) AddMethod(methods ...uint8) {
selector.methods = append(selector.methods, methods...)
}
func (selector *serverSelector) Select(methods ...uint8) (method uint8) {
if Debug {
log.Logf("[socks5] %d %d %v", gosocks5.Ver5, len(methods), methods)
}
method = gosocks5.MethodNoAuth
for _, m := range methods {
if m == MethodTLS {
method = m
break
}
}
// when Authenticator is set, auth is mandatory
if selector.Authenticator != nil {
if method == gosocks5.MethodNoAuth {
method = gosocks5.MethodUserPass
}
if method == MethodTLS {
method = MethodTLSAuth
}
}
return
}
func (selector *serverSelector) OnSelected(method uint8, conn net.Conn) (net.Conn, error) {
if Debug {
log.Logf("[socks5] %d %d", gosocks5.Ver5, method)
}
switch method {
case MethodTLS:
conn = tls.Server(conn, selector.TLSConfig)
case gosocks5.MethodUserPass, MethodTLSAuth:
if method == MethodTLSAuth {
conn = tls.Server(conn, selector.TLSConfig)
}
req, err := gosocks5.ReadUserPassRequest(conn)
if err != nil {
log.Logf("[socks5] %s - %s: %s", conn.RemoteAddr(), conn.LocalAddr(), err)
return nil, err
}
if Debug {
log.Logf("[socks5] %s - %s: %s", conn.RemoteAddr(), conn.LocalAddr(), req.String())
}
if selector.Authenticator != nil && !selector.Authenticator.Authenticate(req.Username, req.Password) {
resp := gosocks5.NewUserPassResponse(gosocks5.UserPassVer, gosocks5.Failure)
if err := resp.Write(conn); err != nil {
log.Logf("[socks5] %s - %s: %s", conn.RemoteAddr(), conn.LocalAddr(), err)
return nil, err
}
if Debug {
log.Logf("[socks5] %s - %s: %s", conn.RemoteAddr(), conn.LocalAddr(), resp)
}
log.Logf("[socks5] %s - %s: proxy authentication required", conn.RemoteAddr(), conn.LocalAddr())
return nil, gosocks5.ErrAuthFailure
}
resp := gosocks5.NewUserPassResponse(gosocks5.UserPassVer, gosocks5.Succeeded)
if err := resp.Write(conn); err != nil {
log.Logf("[socks5] %s - %s: %s", conn.RemoteAddr(), conn.LocalAddr(), err)
return nil, err
}
if Debug {
log.Logf("[socks5] %s - %s: %s", conn.RemoteAddr(), conn.LocalAddr(), resp)
}
case gosocks5.MethodNoAcceptable:
return nil, gosocks5.ErrBadMethod
}
return conn, nil
}
type socks5Connector struct {
User *url.Userinfo
}
// SOCKS5Connector creates a connector for SOCKS5 proxy client.
// It accepts an optional auth info for SOCKS5 Username/Password Authentication.
func SOCKS5Connector(user *url.Userinfo) Connector {
return &socks5Connector{User: user}
}
func (c *socks5Connector) Connect(conn net.Conn, address string, options ...ConnectOption) (net.Conn, error) {
return c.ConnectContext(context.Background(), conn, "tcp", address, options...)
}
func (c *socks5Connector) ConnectContext(ctx context.Context, conn net.Conn, network, address string, options ...ConnectOption) (net.Conn, error) {
switch network {
case "udp", "udp4", "udp6":
cnr := &socks5UDPTunConnector{User: c.User}
return cnr.ConnectContext(ctx, conn, network, address, options...)
}
opts := &ConnectOptions{}
for _, option := range options {
option(opts)
}
timeout := opts.Timeout
if timeout <= 0 {
timeout = ConnectTimeout
}
conn.SetDeadline(time.Now().Add(timeout))
defer conn.SetDeadline(time.Time{})
user := opts.User
if user == nil {
user = c.User
}
cc, err := socks5Handshake(conn,
selectorSocks5HandshakeOption(opts.Selector),
userSocks5HandshakeOption(user),
noTLSSocks5HandshakeOption(opts.NoTLS),
)
if err != nil {
return nil, err
}
conn = cc
host, port, err := net.SplitHostPort(address)
if err != nil {
return nil, err
}
p, _ := strconv.Atoi(port)
req := gosocks5.NewRequest(gosocks5.CmdConnect, &gosocks5.Addr{
Type: gosocks5.AddrDomain,
Host: host,
Port: uint16(p),
})
if err := req.Write(conn); err != nil {
return nil, err
}
if Debug {
log.Log("[socks5]", req)
}
reply, err := gosocks5.ReadReply(conn)
if err != nil {
return nil, err
}
if Debug {
log.Log("[socks5]", reply)
}
if reply.Rep != gosocks5.Succeeded {
return nil, errors.New("Service unavailable")
}
return conn, nil
}
type socks5BindConnector struct {
User *url.Userinfo
}
// SOCKS5BindConnector creates a connector for SOCKS5 bind.
// It accepts an optional auth info for SOCKS5 Username/Password Authentication.
func SOCKS5BindConnector(user *url.Userinfo) Connector {
return &socks5BindConnector{User: user}
}
func (c *socks5BindConnector) Connect(conn net.Conn, address string, options ...ConnectOption) (net.Conn, error) {
return c.ConnectContext(context.Background(), conn, "tcp", address, options...)
}
func (c *socks5BindConnector) ConnectContext(ctx context.Context, conn net.Conn, network, address string, options ...ConnectOption) (net.Conn, error) {
switch network {
case "udp", "udp4", "udp6":
return nil, fmt.Errorf("%s unsupported", network)
}
opts := &ConnectOptions{}
for _, option := range options {
option(opts)
}
timeout := opts.Timeout
if timeout <= 0 {
timeout = ConnectTimeout
}
conn.SetDeadline(time.Now().Add(timeout))
defer conn.SetDeadline(time.Time{})
user := opts.User
if user == nil {
user = c.User
}
cc, err := socks5Handshake(conn,
selectorSocks5HandshakeOption(opts.Selector),
userSocks5HandshakeOption(user),
noTLSSocks5HandshakeOption(opts.NoTLS),
)
if err != nil {
return nil, err
}
conn = cc
laddr, err := net.ResolveTCPAddr("tcp", address)
if err != nil {
log.Log(err)
return nil, err
}
req := gosocks5.NewRequest(gosocks5.CmdBind, &gosocks5.Addr{
Type: gosocks5.AddrIPv4,
Host: laddr.IP.String(),
Port: uint16(laddr.Port),
})
if err := req.Write(conn); err != nil {
return nil, err
}
if Debug {
log.Log("[socks5] bind\n", req)
}
reply, err := gosocks5.ReadReply(conn)
if err != nil {
return nil, err
}
if Debug {
log.Log("[socks5] bind\n", reply)
}
if reply.Rep != gosocks5.Succeeded {
log.Logf("[socks5] bind on %s failure", address)
return nil, fmt.Errorf("SOCKS5 bind on %s failure", address)
}
baddr, err := net.ResolveTCPAddr("tcp", reply.Addr.String())
if err != nil {
return nil, err
}
log.Logf("[socks5] bind on %s OK", baddr)
return &socks5BindConn{Conn: conn, laddr: baddr}, nil
}
type socks5MuxBindConnector struct{}
// Socks5MuxBindConnector creates a Connector for SOCKS5 multiplex bind client.
func Socks5MuxBindConnector() Connector {
return &socks5MuxBindConnector{}
}
func (c *socks5MuxBindConnector) Connect(conn net.Conn, address string, options ...ConnectOption) (net.Conn, error) {
return c.ConnectContext(context.Background(), conn, "tcp", address, options...)
}
// NOTE: the conn must be *muxBindClientConn.
func (c *socks5MuxBindConnector) ConnectContext(ctx context.Context, conn net.Conn, network, address string, options ...ConnectOption) (net.Conn, error) {
switch network {
case "udp", "udp4", "udp6":
return nil, fmt.Errorf("%s unsupported", network)
}
accepter, ok := conn.(Accepter)
if !ok {
return nil, errors.New("wrong connection type")
}
return accepter.Accept()
}
type socks5MuxBindTransporter struct {
bindAddr string
sessions map[string]*muxSession // server addr to session mapping
sessionMutex sync.Mutex
}
// SOCKS5MuxBindTransporter creates a Transporter for SOCKS5 multiplex bind client.
func SOCKS5MuxBindTransporter(bindAddr string) Transporter {
return &socks5MuxBindTransporter{
bindAddr: bindAddr,
sessions: make(map[string]*muxSession),
}
}
func (tr *socks5MuxBindTransporter) Dial(addr string, options ...DialOption) (conn net.Conn, err error) {
opts := &DialOptions{}
for _, option := range options {
option(opts)
}
timeout := opts.Timeout
if timeout <= 0 {
timeout = DialTimeout
}
tr.sessionMutex.Lock()
defer tr.sessionMutex.Unlock()
session, ok := tr.sessions[addr]
if session != nil && session.IsClosed() {
delete(tr.sessions, addr)
ok = false
}
if !ok {
if opts.Chain == nil {
conn, err = net.DialTimeout("tcp", addr, timeout)
} else {
conn, err = opts.Chain.Dial(addr)
}
if err != nil {
return
}
session = &muxSession{conn: conn}
tr.sessions[addr] = session
}
return session.conn, nil
}
func (tr *socks5MuxBindTransporter) Handshake(conn net.Conn, options ...HandshakeOption) (net.Conn, error) {
opts := &HandshakeOptions{}
for _, option := range options {
option(opts)
}
timeout := opts.Timeout
if timeout <= 0 {
timeout = HandshakeTimeout
}
tr.sessionMutex.Lock()
defer tr.sessionMutex.Unlock()
conn.SetDeadline(time.Now().Add(timeout))
defer conn.SetDeadline(time.Time{})
session, ok := tr.sessions[opts.Addr]
if !ok || session.session == nil {
s, err := tr.initSession(conn, tr.bindAddr, opts)
if err != nil {
conn.Close()
delete(tr.sessions, opts.Addr)
return nil, err
}
session = s
tr.sessions[opts.Addr] = session
}
return &muxBindClientConn{session: session}, nil
}
func (tr *socks5MuxBindTransporter) initSession(conn net.Conn, addr string, opts *HandshakeOptions) (*muxSession, error) {
if opts == nil {
opts = &HandshakeOptions{}
}
cc, err := socks5Handshake(conn,
userSocks5HandshakeOption(opts.User),
)
if err != nil {
return nil, err
}
conn = cc
bindAddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
return nil, err
}
req := gosocks5.NewRequest(CmdMuxBind, &gosocks5.Addr{
Type: gosocks5.AddrIPv4,
Host: bindAddr.IP.String(),
Port: uint16(bindAddr.Port),
})
if err = req.Write(conn); err != nil {
return nil, err
}
if Debug {
log.Log("[socks5] mbind\n", req)
}
reply, err := gosocks5.ReadReply(conn)
if err != nil {
return nil, err
}
if Debug {
log.Log("[socks5] mbind\n", reply)
}
if reply.Rep != gosocks5.Succeeded {
log.Logf("[socks5] mbind on %s failure", addr)
return nil, fmt.Errorf("SOCKS5 mbind on %s failure", addr)
}
baddr, err := net.ResolveTCPAddr("tcp", reply.Addr.String())
if err != nil {
return nil, err
}
log.Logf("[socks5] mbind on %s OK", baddr)
// Upgrade connection to multiplex stream.
session, err := smux.Server(conn, smux.DefaultConfig())
if err != nil {
return nil, err
}
return &muxSession{conn: conn, session: session}, nil
}
func (tr *socks5MuxBindTransporter) Multiplex() bool {
return true
}
type socks5UDPConnector struct {
User *url.Userinfo
}
// SOCKS5UDPConnector creates a connector for SOCKS5 UDP relay.
// It accepts an optional auth info for SOCKS5 Username/Password Authentication.
func SOCKS5UDPConnector(user *url.Userinfo) Connector {
return &socks5UDPConnector{User: user}
}
func (c *socks5UDPConnector) Connect(conn net.Conn, address string, options ...ConnectOption) (net.Conn, error) {
return c.ConnectContext(context.Background(), conn, "udp", address, options...)
}
func (c *socks5UDPConnector) ConnectContext(ctx context.Context, conn net.Conn, network, address string, options ...ConnectOption) (net.Conn, error) {
switch network {
case "tcp", "tcp4", "tcp6":
return nil, fmt.Errorf("%s unsupported", network)
}
opts := &ConnectOptions{}
for _, option := range options {
option(opts)
}
timeout := opts.Timeout
if timeout <= 0 {
timeout = ConnectTimeout
}
conn.SetDeadline(time.Now().Add(timeout))
defer conn.SetDeadline(time.Time{})
user := opts.User
if user == nil {
user = c.User
}
cc, err := socks5Handshake(conn,
selectorSocks5HandshakeOption(opts.Selector),
userSocks5HandshakeOption(user),
noTLSSocks5HandshakeOption(opts.NoTLS),
)
if err != nil {
return nil, err
}
conn = cc
taddr, err := net.ResolveUDPAddr("udp", address)
if err != nil {
return nil, err
}
req := gosocks5.NewRequest(gosocks5.CmdUdp, &gosocks5.Addr{
Type: gosocks5.AddrIPv4,
})
if err := req.Write(conn); err != nil {
return nil, err
}
if Debug {
log.Log("[socks5] udp\n", req)
}
reply, err := gosocks5.ReadReply(conn)
if err != nil {
return nil, err
}
if Debug {
log.Log("[socks5] udp\n", reply)
}
if reply.Rep != gosocks5.Succeeded {
log.Logf("[socks5] udp relay failure")
return nil, fmt.Errorf("SOCKS5 udp relay failure")
}
baddr, err := net.ResolveUDPAddr("udp", reply.Addr.String())
if err != nil {
return nil, err
}
log.Logf("[socks5] udp associate on %s OK", baddr)
uc, err := net.DialUDP("udp", nil, baddr)
if err != nil {
return nil, err
}
// log.Logf("udp laddr:%s, raddr:%s", uc.LocalAddr(), uc.RemoteAddr())
return &socks5UDPConn{UDPConn: uc, taddr: taddr}, nil
}
type socks5UDPTunConnector struct {
User *url.Userinfo
}
// SOCKS5UDPTunConnector creates a connector for SOCKS5 UDP-over-TCP relay.
// It accepts an optional auth info for SOCKS5 Username/Password Authentication.
func SOCKS5UDPTunConnector(user *url.Userinfo) Connector {
return &socks5UDPTunConnector{User: user}
}
func (c *socks5UDPTunConnector) Connect(conn net.Conn, address string, options ...ConnectOption) (net.Conn, error) {
return c.ConnectContext(context.Background(), conn, "udp", address, options...)
}
func (c *socks5UDPTunConnector) ConnectContext(ctx context.Context, conn net.Conn, network, address string, options ...ConnectOption) (net.Conn, error) {
switch network {
case "tcp", "tcp4", "tcp6":
return nil, fmt.Errorf("%s unsupported", network)
}
opts := &ConnectOptions{}
for _, option := range options {
option(opts)
}
user := opts.User
if user == nil {
user = c.User
}
timeout := opts.Timeout
if timeout <= 0 {
timeout = ConnectTimeout
}
conn.SetDeadline(time.Now().Add(timeout))
defer conn.SetDeadline(time.Time{})
taddr, _ := net.ResolveUDPAddr("udp", address)
return newSocks5UDPTunnelConn(conn,
nil, taddr,
selectorSocks5HandshakeOption(opts.Selector),
userSocks5HandshakeOption(user),
noTLSSocks5HandshakeOption(opts.NoTLS),
)
}
type socks4Connector struct{}
// SOCKS4Connector creates a Connector for SOCKS4 proxy client.
func SOCKS4Connector() Connector {
return &socks4Connector{}
}
func (c *socks4Connector) Connect(conn net.Conn, address string, options ...ConnectOption) (net.Conn, error) {
return c.ConnectContext(context.Background(), conn, "tcp", address, options...)
}
func (c *socks4Connector) ConnectContext(ctx context.Context, conn net.Conn, network, address string, options ...ConnectOption) (net.Conn, error) {
switch network {
case "udp", "udp4", "udp6":
return nil, fmt.Errorf("%s unsupported", network)
}
opts := &ConnectOptions{}
for _, option := range options {
option(opts)
}
timeout := opts.Timeout
if timeout <= 0 {
timeout = ConnectTimeout
}
conn.SetDeadline(time.Now().Add(timeout))
defer conn.SetDeadline(time.Time{})
taddr, err := net.ResolveTCPAddr("tcp4", address)
if err != nil {
return nil, err
}
if len(taddr.IP) == 0 {
taddr.IP = net.IPv4zero
}
req := gosocks4.NewRequest(gosocks4.CmdConnect,
&gosocks4.Addr{
Type: gosocks4.AddrIPv4,
Host: taddr.IP.String(),
Port: uint16(taddr.Port),
}, nil,
)
if err := req.Write(conn); err != nil {
return nil, err
}
if Debug {
log.Logf("[socks4] %s", req)
}
reply, err := gosocks4.ReadReply(conn)
if err != nil {
return nil, err
}
if Debug {
log.Logf("[socks4] %s", reply)
}
if reply.Code != gosocks4.Granted {
return nil, fmt.Errorf("[socks4] %d", reply.Code)
}
return conn, nil
}
type socks4aConnector struct{}
// SOCKS4AConnector creates a Connector for SOCKS4A proxy client.
func SOCKS4AConnector() Connector {
return &socks4aConnector{}
}
func (c *socks4aConnector) Connect(conn net.Conn, address string, options ...ConnectOption) (net.Conn, error) {
return c.ConnectContext(context.Background(), conn, "tcp", address, options...)
}
func (c *socks4aConnector) ConnectContext(ctx context.Context, conn net.Conn, network, address string, options ...ConnectOption) (net.Conn, error) {
switch network {
case "udp", "udp4", "udp6":
return nil, fmt.Errorf("%s unsupported", network)
}
opts := &ConnectOptions{}
for _, option := range options {
option(opts)
}
timeout := opts.Timeout
if timeout <= 0 {
timeout = ConnectTimeout
}
conn.SetDeadline(time.Now().Add(timeout))
defer conn.SetDeadline(time.Time{})
host, port, err := net.SplitHostPort(address)
if err != nil {
return nil, err
}
p, _ := strconv.Atoi(port)
req := gosocks4.NewRequest(gosocks4.CmdConnect,
&gosocks4.Addr{Type: gosocks4.AddrDomain, Host: host, Port: uint16(p)}, nil)
if err := req.Write(conn); err != nil {
return nil, err
}
if Debug {
log.Logf("[socks4a] %s", req)
}
reply, err := gosocks4.ReadReply(conn)
if err != nil {
return nil, err
}
if Debug {
log.Logf("[socks4a] %s", reply)
}
if reply.Code != gosocks4.Granted {
return nil, fmt.Errorf("[socks4a] %d", reply.Code)
}
return conn, nil
}
type socks5Handler struct {
selector *serverSelector
options *HandlerOptions
}
// SOCKS5Handler creates a server Handler for SOCKS5 proxy server.
func SOCKS5Handler(opts ...HandlerOption) Handler {
h := &socks5Handler{}
h.Init(opts...)
return h
}
func (h *socks5Handler) Init(options ...HandlerOption) {
if h.options == nil {
h.options = &HandlerOptions{}
}
for _, opt := range options {
opt(h.options)
}
tlsConfig := h.options.TLSConfig
if tlsConfig == nil {
tlsConfig = DefaultTLSConfig
}
h.selector = &serverSelector{ // socks5 server selector
// Users: h.options.Users,
Authenticator: h.options.Authenticator,
TLSConfig: tlsConfig,
}
// methods that socks5 server supported
h.selector.AddMethod(
gosocks5.MethodNoAuth,
gosocks5.MethodUserPass,
MethodTLS,
MethodTLSAuth,
)
}
func (h *socks5Handler) Handle(conn net.Conn) {
defer conn.Close()
conn = gosocks5.ServerConn(conn, h.selector)
req, err := gosocks5.ReadRequest(conn)
if err != nil {
log.Logf("[socks5] %s -> %s : %s",
conn.RemoteAddr(), conn.LocalAddr(), err)
return
}
if Debug {
log.Logf("[socks5] %s -> %s\n%s",
conn.RemoteAddr(), conn.LocalAddr(), req)
}
switch req.Cmd {
case gosocks5.CmdConnect:
h.handleConnect(conn, req)
case gosocks5.CmdBind:
h.handleBind(conn, req)
case gosocks5.CmdUdp:
h.handleUDPRelay(conn, req)
case CmdMuxBind:
h.handleMuxBind(conn, req)
case CmdUDPTun:
h.handleUDPTunnel(conn, req)
default:
log.Logf("[socks5] %s - %s : Unrecognized request: %d",
conn.RemoteAddr(), conn.LocalAddr(), req.Cmd)
}
}
func (h *socks5Handler) handleConnect(conn net.Conn, req *gosocks5.Request) {
host := req.Addr.String()
log.Logf("[socks5] %s -> %s -> %s",
conn.RemoteAddr(), h.options.Node.String(), host)
if !Can("tcp", host, h.options.Whitelist, h.options.Blacklist) {
log.Logf("[socks5] %s - %s : Unauthorized to tcp connect to %s",
conn.RemoteAddr(), conn.LocalAddr(), host)
rep := gosocks5.NewReply(gosocks5.NotAllowed, nil)
rep.Write(conn)
if Debug {
log.Logf("[socks5] %s <- %s\n%s",
conn.RemoteAddr(), conn.LocalAddr(), rep)
}
return
}
if h.options.Bypass.Contains(host) {
log.Logf("[socks5] %s - %s : Bypass %s",
conn.RemoteAddr(), conn.LocalAddr(), host)
rep := gosocks5.NewReply(gosocks5.NotAllowed, nil)
rep.Write(conn)
if Debug {
log.Logf("[socks5] %s <- %s\n%s",
conn.RemoteAddr(), conn.LocalAddr(), rep)
}
return
}
retries := 1
if h.options.Chain != nil && h.options.Chain.Retries > 0 {
retries = h.options.Chain.Retries
}
if h.options.Retries > 0 {
retries = h.options.Retries
}
var err error
var cc net.Conn
var route *Chain
for i := 0; i < retries; i++ {
route, err = h.options.Chain.selectRouteFor(host)
if err != nil {
log.Logf("[socks5] %s -> %s : %s",
conn.RemoteAddr(), conn.LocalAddr(), err)
continue
}
buf := bytes.Buffer{}
fmt.Fprintf(&buf, "%s -> %s -> ",
conn.RemoteAddr(), h.options.Node.String())
for _, nd := range route.route {
fmt.Fprintf(&buf, "%d@%s -> ", nd.ID, nd.String())
}
fmt.Fprintf(&buf, "%s", host)
log.Log("[route]", buf.String())
cc, err = route.Dial(host,
TimeoutChainOption(h.options.Timeout),
HostsChainOption(h.options.Hosts),
ResolverChainOption(h.options.Resolver),
)
if err == nil {
break
}
log.Logf("[socks5] %s -> %s : %s",
conn.RemoteAddr(), conn.LocalAddr(), err)
}
if err != nil {
rep := gosocks5.NewReply(gosocks5.HostUnreachable, nil)
rep.Write(conn)
if Debug {
log.Logf("[socks5] %s <- %s\n%s",
conn.RemoteAddr(), conn.LocalAddr(), rep)
}
return
}
defer cc.Close()
rep := gosocks5.NewReply(gosocks5.Succeeded, nil)
if err := rep.Write(conn); err != nil {
log.Logf("[socks5] %s <- %s : %s",
conn.RemoteAddr(), conn.LocalAddr(), err)
return
}
if Debug {
log.Logf("[socks5] %s <- %s\n%s",
conn.RemoteAddr(), conn.LocalAddr(), rep)
}
log.Logf("[socks5] %s <-> %s", conn.RemoteAddr(), host)
transport(conn, cc)
log.Logf("[socks5] %s >-< %s", conn.RemoteAddr(), host)
}
func (h *socks5Handler) handleBind(conn net.Conn, req *gosocks5.Request) {
addr := req.Addr.String()
log.Logf("[socks5-bind] %s -> %s -> %s",
conn.RemoteAddr(), h.options.Node.String(), addr)
if h.options.Chain.IsEmpty() {
if !Can("rtcp", addr, h.options.Whitelist, h.options.Blacklist) {
log.Logf("[socks5-bind] %s - %s : Unauthorized to tcp bind to %s",
conn.RemoteAddr(), conn.LocalAddr(), addr)
return
}
h.bindOn(conn, addr)
return
}
cc, err := h.options.Chain.Conn()
if err != nil {
log.Logf("[socks5-bind] %s <- %s : %s",
conn.RemoteAddr(), conn.LocalAddr(), err)
reply := gosocks5.NewReply(gosocks5.Failure, nil)