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ss.go
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package gost
import (
"bytes"
"context"
"encoding/binary"
"fmt"
"io"
"net"
"net/url"
"time"
"github.com/ginuerzh/gosocks5"
"github.com/go-log/log"
"github.com/shadowsocks/go-shadowsocks2/core"
ss "github.com/shadowsocks/shadowsocks-go/shadowsocks"
)
const (
maxSocksAddrLen = 259
)
var (
_ net.Conn = (*shadowConn)(nil)
_ net.PacketConn = (*shadowUDPPacketConn)(nil)
)
type shadowConnector struct {
cipher core.Cipher
}
// ShadowConnector creates a Connector for shadowsocks proxy client.
// It accepts an optional cipher info for shadowsocks data encryption/decryption.
func ShadowConnector(info *url.Userinfo) Connector {
return &shadowConnector{
cipher: initShadowCipher(info),
}
}
func (c *shadowConnector) Connect(conn net.Conn, address string, options ...ConnectOption) (net.Conn, error) {
return c.ConnectContext(context.Background(), conn, "tcp", address, options...)
}
func (c *shadowConnector) 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
}
socksAddr, err := gosocks5.NewAddr(address)
if err != nil {
return nil, err
}
rawaddr := sPool.Get().([]byte)
defer sPool.Put(rawaddr)
n, err := socksAddr.Encode(rawaddr)
if err != nil {
return nil, err
}
conn.SetDeadline(time.Now().Add(timeout))
defer conn.SetDeadline(time.Time{})
if c.cipher != nil {
conn = c.cipher.StreamConn(conn)
}
sc := &shadowConn{
Conn: conn,
}
// write the addr at once.
if opts.NoDelay {
if _, err := sc.Write(rawaddr[:n]); err != nil {
return nil, err
}
} else {
sc.wbuf.Write(rawaddr[:n]) // cache the header
}
return sc, nil
}
type shadowHandler struct {
cipher core.Cipher
options *HandlerOptions
}
// ShadowHandler creates a server Handler for shadowsocks proxy server.
func ShadowHandler(opts ...HandlerOption) Handler {
h := &shadowHandler{}
h.Init(opts...)
return h
}
func (h *shadowHandler) Init(options ...HandlerOption) {
if h.options == nil {
h.options = &HandlerOptions{}
}
for _, opt := range options {
opt(h.options)
}
if len(h.options.Users) > 0 {
h.cipher = initShadowCipher(h.options.Users[0])
}
}
func (h *shadowHandler) Handle(conn net.Conn) {
defer conn.Close()
if h.cipher != nil {
conn = &shadowConn{
Conn: h.cipher.StreamConn(conn),
}
}
conn.SetReadDeadline(time.Now().Add(ReadTimeout))
addr, err := readSocksAddr(conn)
if err != nil {
log.Logf("[ss] %s -> %s : %s",
conn.RemoteAddr(), conn.LocalAddr(), err)
return
}
conn.SetReadDeadline(time.Time{})
host := addr.String()
log.Logf("[ss] %s -> %s",
conn.RemoteAddr(), host)
if !Can("tcp", host, h.options.Whitelist, h.options.Blacklist) {
log.Logf("[ss] %s - %s : Unauthorized to tcp connect to %s",
conn.RemoteAddr(), conn.LocalAddr(), host)
return
}
if h.options.Bypass.Contains(host) {
log.Logf("[ss] %s - %s : Bypass %s",
conn.RemoteAddr(), conn.LocalAddr(), host)
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 cc net.Conn
var route *Chain
for i := 0; i < retries; i++ {
route, err = h.options.Chain.selectRouteFor(host)
if err != nil {
log.Logf("[ss] %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("[ss] %s -> %s : %s",
conn.RemoteAddr(), conn.LocalAddr(), err)
}
if err != nil {
return
}
defer cc.Close()
log.Logf("[ss] %s <-> %s", conn.RemoteAddr(), host)
transport(conn, cc)
log.Logf("[ss] %s >-< %s", conn.RemoteAddr(), host)
}
type shadowUDPConnector struct {
cipher core.Cipher
}
// ShadowUDPConnector creates a Connector for shadowsocks UDP client.
// It accepts an optional cipher info for shadowsocks data encryption/decryption.
func ShadowUDPConnector(info *url.Userinfo) Connector {
return &shadowUDPConnector{
cipher: initShadowCipher(info),
}
}
func (c *shadowUDPConnector) Connect(conn net.Conn, address string, options ...ConnectOption) (net.Conn, error) {
return c.ConnectContext(context.Background(), conn, "udp", address, options...)
}
func (c *shadowUDPConnector) 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{})
taddr, _ := net.ResolveUDPAddr(network, address)
if taddr == nil {
taddr = &net.UDPAddr{}
}
pc, ok := conn.(net.PacketConn)
if ok {
if c.cipher != nil {
pc = c.cipher.PacketConn(pc)
}
return &shadowUDPPacketConn{
PacketConn: pc,
raddr: conn.RemoteAddr(),
taddr: taddr,
}, nil
}
if c.cipher != nil {
conn = &shadowConn{
Conn: c.cipher.StreamConn(conn),
}
}
return &socks5UDPTunnelConn{
Conn: conn,
taddr: taddr,
}, nil
}
type shadowUDPHandler struct {
cipher core.Cipher
options *HandlerOptions
}
// ShadowUDPHandler creates a server Handler for shadowsocks UDP relay server.
func ShadowUDPHandler(opts ...HandlerOption) Handler {
h := &shadowUDPHandler{}
h.Init(opts...)
return h
}
func (h *shadowUDPHandler) Init(options ...HandlerOption) {
if h.options == nil {
h.options = &HandlerOptions{}
}
for _, opt := range options {
opt(h.options)
}
if len(h.options.Users) > 0 {
h.cipher = initShadowCipher(h.options.Users[0])
}
}
func (h *shadowUDPHandler) Handle(conn net.Conn) {
defer conn.Close()
var cc net.PacketConn
c, err := h.options.Chain.DialContext(context.Background(), "udp", "")
if err != nil {
log.Logf("[ssu] %s: %s", conn.LocalAddr(), err)
return
}
var ok bool
cc, ok = c.(net.PacketConn)
if !ok {
log.Logf("[ssu] %s: not a packet connection", conn.LocalAddr())
return
}
defer cc.Close()
pc, ok := conn.(net.PacketConn)
if ok {
if h.cipher != nil {
pc = h.cipher.PacketConn(pc)
}
log.Logf("[ssu] %s <-> %s", conn.RemoteAddr(), conn.LocalAddr())
h.transportPacket(pc, cc)
log.Logf("[ssu] %s >-< %s", conn.RemoteAddr(), conn.LocalAddr())
return
}
if h.cipher != nil {
conn = &shadowConn{
Conn: h.cipher.StreamConn(conn),
}
}
log.Logf("[ssu] %s <-> %s", conn.RemoteAddr(), conn.LocalAddr())
h.transportUDP(conn, cc)
log.Logf("[ssu] %s >-< %s", conn.RemoteAddr(), conn.LocalAddr())
}
func (h *shadowUDPHandler) transportPacket(conn, cc net.PacketConn) (err error) {
errc := make(chan error, 1)
var clientAddr net.Addr
go func() {
for {
err := func() error {
b := mPool.Get().([]byte)
defer mPool.Put(b)
n, addr, err := conn.ReadFrom(b)
if err != nil {
return err
}
if clientAddr == nil {
clientAddr = addr
}
r := bytes.NewBuffer(b[:n])
saddr, err := readSocksAddr(r)
if err != nil {
return err
}
taddr, err := net.ResolveUDPAddr("udp", saddr.String())
if err != nil {
return err
}
if Debug {
log.Logf("[ssu] %s >>> %s length: %d", addr, taddr, r.Len())
}
_, err = cc.WriteTo(r.Bytes(), taddr)
return err
}()
if err != nil {
errc <- err
return
}
}
}()
go func() {
for {
err := func() error {
b := mPool.Get().([]byte)
defer mPool.Put(b)
n, addr, err := cc.ReadFrom(b)
if err != nil {
return err
}
if clientAddr == nil {
return nil
}
if Debug {
log.Logf("[ssu] %s <<< %s length: %d", clientAddr, addr, n)
}
dgram := gosocks5.NewUDPDatagram(gosocks5.NewUDPHeader(0, 0, toSocksAddr(addr)), b[:n])
buf := bytes.Buffer{}
if err = dgram.Write(&buf); err != nil {
return err
}
_, err = conn.WriteTo(buf.Bytes()[3:], clientAddr)
return err
}()
if err != nil {
errc <- err
return
}
}
}()
select {
case err = <-errc:
}
return
}
func (h *shadowUDPHandler) transportUDP(conn net.Conn, cc net.PacketConn) error {
errc := make(chan error, 1)
go func() {
for {
er := func() (err error) {
dgram, err := gosocks5.ReadUDPDatagram(conn)
if err != nil {
// log.Logf("[ssu] %s - %s : %s", conn.RemoteAddr(), conn.LocalAddr(), err)
return
}
if Debug {
log.Logf("[ssu] %s >>> %s length: %d",
conn.RemoteAddr(), dgram.Header.Addr.String(), len(dgram.Data))
}
addr, err := net.ResolveUDPAddr("udp", dgram.Header.Addr.String())
if err != nil {
return
}
if h.options.Bypass.Contains(addr.String()) {
log.Log("[ssu] bypass", addr)
return // bypass
}
_, err = cc.WriteTo(dgram.Data, addr)
return
}()
if er != nil {
errc <- er
return
}
}
}()
go func() {
for {
er := func() (err error) {
b := mPool.Get().([]byte)
defer mPool.Put(b)
n, addr, err := cc.ReadFrom(b)
if err != nil {
return
}
if Debug {
log.Logf("[ssu] %s <<< %s length: %d", conn.RemoteAddr(), addr, n)
}
if h.options.Bypass.Contains(addr.String()) {
log.Log("[ssu] bypass", addr)
return // bypass
}
dgram := gosocks5.NewUDPDatagram(
gosocks5.NewUDPHeader(uint16(n), 0, toSocksAddr(addr)), b[:n])
buf := bytes.Buffer{}
dgram.Write(&buf)
_, err = conn.Write(buf.Bytes())
return
}()
if er != nil {
errc <- er
return
}
}
}()
err := <-errc
if err != nil && err == io.EOF {
err = nil
}
return err
}
// Due to in/out byte length is inconsistent of the shadowsocks.Conn.Write,
// we wrap around it to make io.Copy happy.
type shadowConn struct {
net.Conn
wbuf bytes.Buffer
}
func (c *shadowConn) Write(b []byte) (n int, err error) {
n = len(b) // force byte length consistent
if c.wbuf.Len() > 0 {
c.wbuf.Write(b) // append the data to the cached header
_, err = c.Conn.Write(c.wbuf.Bytes())
c.wbuf.Reset()
return
}
_, err = c.Conn.Write(b)
return
}
type shadowUDPPacketConn struct {
net.PacketConn
raddr net.Addr
taddr net.Addr
}
func (c *shadowUDPPacketConn) ReadFrom(b []byte) (n int, addr net.Addr, err error) {
buf := mPool.Get().([]byte)
defer mPool.Put(buf)
buf[0] = 0
buf[1] = 0
buf[2] = 0
n, _, err = c.PacketConn.ReadFrom(buf[3:])
if err != nil {
return
}
dgram, err := gosocks5.ReadUDPDatagram(bytes.NewReader(buf[:n+3]))
if err != nil {
return
}
n = copy(b, dgram.Data)
addr, err = net.ResolveUDPAddr("udp", dgram.Header.Addr.String())
return
}
func (c *shadowUDPPacketConn) Read(b []byte) (n int, err error) {
n, _, err = c.ReadFrom(b)
return
}
func (c *shadowUDPPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
sa, err := gosocks5.NewAddr(addr.String())
if err != nil {
return
}
var rawaddr [maxSocksAddrLen]byte
nn, err := sa.Encode(rawaddr[:])
if err != nil {
return
}
buf := mPool.Get().([]byte)
defer mPool.Put(buf)
copy(buf, rawaddr[:nn])
n = copy(buf[nn:], b)
_, err = c.PacketConn.WriteTo(buf[:n+nn], c.raddr)
return
}
func (c *shadowUDPPacketConn) Write(b []byte) (n int, err error) {
return c.WriteTo(b, c.taddr)
}
func (c *shadowUDPPacketConn) RemoteAddr() net.Addr {
return c.raddr
}
type shadowCipher struct {
cipher *ss.Cipher
}
func (c *shadowCipher) StreamConn(conn net.Conn) net.Conn {
return ss.NewConn(conn, c.cipher.Copy())
}
func (c *shadowCipher) PacketConn(conn net.PacketConn) net.PacketConn {
return ss.NewSecurePacketConn(conn, c.cipher.Copy(), false)
}
func initShadowCipher(info *url.Userinfo) (cipher core.Cipher) {
var method, password string
if info != nil {
method = info.Username()
password, _ = info.Password()
}
if method == "" || password == "" {
return
}
cp, _ := ss.NewCipher(method, password)
if cp != nil {
cipher = &shadowCipher{cipher: cp}
}
if cipher == nil {
var err error
cipher, err = core.PickCipher(method, nil, password)
if err != nil {
log.Logf("[ss] %s", err)
return
}
}
return
}
func readSocksAddr(r io.Reader) (*gosocks5.Addr, error) {
addr := &gosocks5.Addr{}
b := sPool.Get().([]byte)
defer sPool.Put(b)
_, err := io.ReadFull(r, b[:1])
if err != nil {
return nil, err
}
addr.Type = b[0]
switch addr.Type {
case gosocks5.AddrIPv4:
_, err = io.ReadFull(r, b[:net.IPv4len])
addr.Host = net.IP(b[0:net.IPv4len]).String()
case gosocks5.AddrIPv6:
_, err = io.ReadFull(r, b[:net.IPv6len])
addr.Host = net.IP(b[0:net.IPv6len]).String()
case gosocks5.AddrDomain:
if _, err = io.ReadFull(r, b[:1]); err != nil {
return nil, err
}
addrlen := int(b[0])
_, err = io.ReadFull(r, b[:addrlen])
addr.Host = string(b[:addrlen])
default:
return nil, gosocks5.ErrBadAddrType
}
if err != nil {
return nil, err
}
_, err = io.ReadFull(r, b[:2])
addr.Port = binary.BigEndian.Uint16(b[:2])
return addr, err
}