586 lines
12 KiB
Go
586 lines
12 KiB
Go
package server
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"fmt"
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"hash/crc32"
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"log"
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"net"
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"rakshasa/common"
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"runtime/debug"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"unsafe"
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"github.com/luyu6056/ishell"
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)
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const (
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STATUS_OFF = 0
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STATUS_ON = 1
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UDP_PORT_MIN = 30000
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UDP_PORT_MAX = 60000
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SOCKES5_VERSION = 5
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)
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var (
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SOCKES5_AUTH_SUSSCES []byte = []byte{5, 0}
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SOCKES5_AUTHPW_SUSSCES []byte = []byte{5, 2}
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PROTOCOL_ERR = errors.New("protocolErr")
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)
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const (
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SERVER_NUM = 4 //有效的连接数量
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CONN_AUTH_CLOSE = 0
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CONN_AUTH_NONE = 1
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CONN_AUTH_PW = 2
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CONN_AUTH_OK = 3
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CONN_AUTH_MESSAGE = 4
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CONN_REMOTE_CLOSE = 0
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CONN_REMOTE_OPEN = 1
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)
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type clientConnect struct {
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cfg *common.Addr
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windowsSize int64
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isClose int32
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conn net.Conn
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udpConn net.Conn
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remote int32
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auth int
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server *node
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id uint32
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wait chan int
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close string
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udpMap sync.Map
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udpRepData []byte
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addrData []byte
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listenId uint32
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}
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func (s *clientConnect) Write(b []byte) {
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switch b[0] {
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case common.CMD_CONNECT_BYIDADDR_RESULT:
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switch common.NetWork(b[1]) {
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case common.SOCKS5_CMD_CONNECT:
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if b[2] != 1 {
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go func() { s.Close("") }()
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} else {
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//发送成功消息
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s.auth = CONN_AUTH_MESSAGE
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s.conn.Write(append([]byte{5, 0, 0}, s.addrData...))
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}
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case common.SOCKS5_CMD_BIND:
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s.auth = CONN_AUTH_MESSAGE
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s.conn.Write(append([]byte{5, 0, 0}, s.addrData...))
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case common.RAW_TCP:
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if b[2] != 1 {
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go func() { s.Close("") }()
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}
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default:
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log.Println("未处理")
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}
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case common.CMD_CONN_MSG:
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if common.Debug {
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fmt.Println("收到", crc32.ChecksumIEEE(b[1:]), len(b[1:]))
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}
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s.conn.Write(b[1:])
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s.Addwindow(int64(-len(b[1:])))
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case common.CMD_CONN_UDP_MSG:
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s.udpConn.Write(b[1:])
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}
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}
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var remoteClose = "服务器要求远程关闭"
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func (s *clientConnect) Close(msg string) {
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if atomic.CompareAndSwapInt32(&s.isClose, 0, 1) {
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<-s.wait
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s.wait <- common.CONN_STATUS_CLOSE
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s.auth = CONN_AUTH_CLOSE
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s.server.connMap.Delete(s.id)
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if msg == "" {
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msg = "未知关闭"
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}
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s.close = msg
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if msg == remoteClose {
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s.remote = CONN_REMOTE_CLOSE
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} else if s.remote == CONN_REMOTE_OPEN {
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s.remote = CONN_REMOTE_CLOSE
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s.Remoteclose()
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}
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if common.Debug {
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fmt.Println("close 原因", msg)
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}
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s.conn.Close()
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if s.udpConn != nil {
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s.udpConn.Close()
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}
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s.udpMap.Range(func(k, _ interface{}) bool {
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s.udpMap.Delete(k)
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return true
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})
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}
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}
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func (s *clientConnect) Addwindow(window int64) {
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windows_size := atomic.AddInt64(&s.windowsSize, window)
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windows_update_size := int64(common.INIT_WINDOWS_SIZE)
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if windows_size < windows_update_size/2 { //扩大窗口
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if size := windows_update_size - s.windowsSize; size > 0 {
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atomic.AddInt64(&s.windowsSize, size)
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go func() {
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buf := make([]byte, 8)
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buf[0] = byte(size & 255)
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buf[1] = byte(size >> 8 & 255)
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buf[2] = byte(size >> 16 & 255)
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buf[3] = byte(size >> 24 & 255)
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buf[4] = byte(size >> 32 & 255)
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buf[5] = byte(size >> 40 & 255)
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buf[6] = byte(size >> 48 & 255)
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buf[7] = byte(size >> 56 & 255)
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s.server.Write(common.CMD_WINDOWS_UPDATE, s.id, buf)
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}()
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}
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}
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}
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func StartSocks5(cfg *common.Addr, dst []string) error {
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var target *node
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var err error
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if len(dst) == 0 {
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target = currentNode
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} else {
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target, err = GetNodeFromAddrs(dst)
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if err != nil {
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return err
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}
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}
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l := &clientListen{
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server: target,
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localAddr: cfg.Addr(),
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id: common.GetID(),
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typ: "socks5",
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}
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l.listen, err = StartSocks5WithServer(cfg, target, l.id)
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if err != nil {
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return err
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}
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currentNode.listenMap.Store(l.id, l)
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return nil
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}
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func StartSocks5WithServer(cfg *common.Addr, n *node, id uint32) (net.Listener, error) {
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l, err := net.Listen("tcp", cfg.Addr())
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if err != nil {
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return nil, err
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}
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fmt.Println("socks5 start ", cfg.Addr())
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go func() {
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for {
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conn, err := l.Accept()
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if err != nil {
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if err.(*net.OpError).Err == net.ErrClosed {
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return
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}
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continue
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}
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c := &clientConnect{
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cfg: cfg,
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conn: conn,
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server: n,
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listenId: id,
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}
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go handleSocks5Local(c)
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}
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}()
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return l, nil
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}
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func (s *clientConnect) OnOpened() (close bool) {
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s.wait = make(chan int, 1)
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s.auth = CONN_AUTH_NONE
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s.remote = CONN_REMOTE_OPEN
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s.windowsSize = 0
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s.wait <- common.CONN_STATUS_OK
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return
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}
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// 监听本地服务
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func handleSocks5Local(s *clientConnect) {
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defer func() {
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if err := recover(); err != nil {
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fmt.Println(err)
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debug.PrintStack()
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}
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}()
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b := make([]byte, common.MAX_PLAINTEXT-8)
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if s.OnOpened() {
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s.Close("无法获得服务器连接")
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}
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for {
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n, err := s.conn.Read(b)
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if err != nil {
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s.Close(err.Error())
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return
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}
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data := b[:n]
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switch s.auth {
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case CONN_AUTH_NONE:
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if len(data) > 2 {
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if data[0] == 5 {
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if s.cfg.User() != "" && s.cfg.Password() != "" {
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s.conn.Write(SOCKES5_AUTH_SUSSCES)
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s.auth = CONN_AUTH_PW
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} else {
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s.conn.Write(SOCKES5_AUTH_SUSSCES)
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s.auth = CONN_AUTH_OK
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}
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}
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}
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case CONN_AUTH_PW:
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if s.cfg.User() != "" && s.cfg.Password() != "" {
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if len(data) > 4 {
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defer recover()
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user := string(data[2 : 2+data[1]])
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password := string(data[3+data[1] : 3+data[1]+data[2+data[1]]])
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if user == s.cfg.User() && password == s.cfg.Password() {
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s.conn.Write([]byte{5, 0})
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s.auth = CONN_AUTH_OK
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} else {
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s.conn.Write([]byte{5, 1})
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}
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}
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} else {
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s.conn.Write([]byte{5, 0})
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s.auth = CONN_AUTH_OK
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}
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case CONN_AUTH_OK:
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s.addrData = data[3:]
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switch common.NetWork(data[1]) {
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case common.SOCKS5_CMD_CONNECT:
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addr, port := socks5ReadAddr(data)
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s.connect(common.SOCKS5_CMD_CONNECT, addr, port)
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case common.SOCKS5_CMD_BIND:
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addr, port := socks5ReadAddr(data)
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s.connect(common.SOCKS5_CMD_BIND, addr, port)
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case common.SOCKS5_CMD_UDP:
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localIP := s.conn.LocalAddr().String()
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localIP = localIP[:strings.Index(localIP, ":")]
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//找一个能用的udp端口
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var port uint16
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for i := uint16(UDP_PORT_MIN); i <= UDP_PORT_MAX; i++ {
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s.udpConn, err = net.ListenUDP("udp", &net.UDPAddr{
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IP: net.ParseIP(localIP),
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Port: int(i),
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})
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if err == nil {
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port = i
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break
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}
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}
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if s.udpConn == nil {
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data[0] = 5
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data[1] = 1 //RepRuleFailure
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s.conn.Write(data)
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continue
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}
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repdata := []byte{5, 0, 0, 1, 0, 0, 0, 0, byte(port >> 8), byte(port)}
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ipb := ipToByte(localIP)
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addr, port := socks5ReadAddr(data)
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s.connect(common.SOCKS5_CMD_UDP, addr, port)
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copy(repdata[4:], ipb)
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s.conn.Write(repdata)
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go handleSocks5Udp(s)
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default:
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data[0] = 5
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data[1] = 7 //RepCmdNotSupported
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s.conn.Write(data)
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}
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case CONN_AUTH_MESSAGE:
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//binary.LittleEndian.PutUint32(outbuf[5:], crc32.ChecksumIEEE(data)+conn.msgno)
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//conn.msgno++
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var new_size int64
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if new_size = int64(common.INIT_WINDOWS_SIZE) - s.windowsSize; new_size > 0 { //扩大窗口
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atomic.AddInt64(&s.windowsSize, new_size)
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} else {
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new_size = 0
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}
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buf := make([]byte, 8)
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buf[0] = byte(new_size)
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buf[1] = byte(new_size >> 8)
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buf[2] = byte(new_size >> 16)
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buf[3] = byte(new_size >> 24)
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buf[4] = byte(new_size >> 32)
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buf[5] = byte(new_size >> 40)
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buf[6] = byte(new_size >> 48)
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buf[7] = byte(new_size >> 56)
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if common.Debug {
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fmt.Println("发送", crc32.ChecksumIEEE(data), len(data))
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}
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s.server.Write(common.CMD_CONN_MSG, s.id, append(buf, data...))
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}
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}
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}
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func handleSocks5Udp(s *clientConnect) {
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var b = make([]byte, 65535)
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for {
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n, err := s.udpConn.Read(b)
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if err != nil {
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s.Close(err.Error())
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return
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}
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data := b[:n]
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if b[2] != 0 {
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//不支持分片
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continue
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}
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data = data[3:]
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common.GetIDLock.Lock()
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var udpid uint32
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switch data[0] {
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case 1:
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ip := fmt.Sprintf("%d.%d.%d.%d:%d", data[1], data[2], data[3], data[4], int(data[5])<<8|int(data[6]))
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if v, ok := s.udpMap.Load(ip); !ok {
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udps := &clientConnect{
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server: s.server,
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}
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udps.udpConn = s.udpConn
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udps.id = udps.server.storeConn(s)
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udpid = udps.id
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udps.udpRepData = make([]byte, 10)
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copy(udps.udpRepData, data)
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udps.udpMap.Store(ip, udpid)
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} else {
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udpid = v.(uint32)
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}
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case 3:
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case 4:
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}
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common.GetIDLock.Unlock()
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buf := make([]byte, 4)
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buf[0] = byte(udpid)
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buf[1] = byte(udpid >> 8)
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buf[2] = byte(udpid >> 16)
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buf[3] = byte(udpid >> 24)
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s.server.Write(common.CMD_CONN_UDP_MSG, udpid, append(buf, data...))
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}
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}
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func (s *clientConnect) connect(command common.NetWork, addr string, port uint16) {
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ports := strconv.Itoa(int(port))
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buf := make([]byte, 2+len(addr)+len(ports))
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s.id = s.server.storeConn(s)
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buf[0] = byte(command)
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copy(buf[1:], addr)
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buf[1+len(addr)] = ':'
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copy(buf[2+len(addr):], ports)
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s.server.Write(common.CMD_CONNECT_BYIDADDR, s.id, buf)
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if value, ok := s.server.listenMap.Load(s.listenId); ok {
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switch v := value.(type) {
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case *serverListen:
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v.connMap.Store(s.id, s)
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case *clientListen:
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v.connMap.Store(s.id, s)
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}
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}
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}
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func Bytes2str(b []byte) string {
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return *(*string)(unsafe.Pointer(&b))
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}
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func (s *clientConnect) Remoteclose() {
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s.close = "本地要求远程关闭"
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buf := make([]byte, 4)
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buf[0] = byte(s.id)
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buf[1] = byte(s.id >> 8)
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buf[2] = byte(s.id >> 16)
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buf[3] = byte(s.id >> 24)
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s.server.Write(common.CMD_DELETE_LISTENCONN_BYID, s.listenId, buf)
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}
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func init() {
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socks5shell := cliInit()
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socks5shell.SetPrompt("rakshasa\\socks5>")
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socks5shell.AddCmd(&ishell.Cmd{
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Name: "list",
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Help: "列出当前连接的ID和其他信息",
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Func: func(c *ishell.Context) {
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var list []*clientListen
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currentNode.listenMap.Range(func(key, value interface{}) bool {
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if v, ok := value.(*clientListen); ok && v.typ == "socks5" {
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list = append(list, v)
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}
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return true
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})
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orderClientListen(list)
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fmt.Println("当前监听端口数量:", len(list))
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for _, v := range list {
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fmt.Println("ID", v.id, "本地监听端口", v.localAddr, "转发服务器uuid", v.server.uuid)
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}
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},
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})
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socks5shell.AddCmd(&ishell.Cmd{
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Name: "new-socks5",
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Help: "新建一个socks5连接，使用方法 new-socks5 配置字符串 目标服务器 如 new-socks5 admin:[email protected]:1080 127.0.0.1:8881,127.0.0.1:8882",
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Func: func(c *ishell.Context) {
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if len(c.Args) < 1 {
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c.Println("参数错误，例子 new-socks5 admin:[email protected]:1080")
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return
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}
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cfg, err := common.ParseAddr(c.Args[0])
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if err != nil {
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c.Println(err)
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return
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}
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nodes := []string{}
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if len(c.Args) == 2 {
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nodes = strings.Split(c.Args[1], ",")
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}
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if err := StartSocks5(cfg, nodes); err != nil {
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c.Println("本地socks5启动失败", err)
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} else {
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c.Println("本地socks5启动成功")
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}
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},
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})
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socks5shell.AddCmd(&ishell.Cmd{
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Name: "close",
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Help: "关闭一个socsk5监听实例，使用方法 close ID",
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Func: func(c *ishell.Context) {
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if len(c.Args) != 1 {
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c.Println("参数错误，例子 close 1")
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return
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}
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id, _ := strconv.Atoi(c.Args[0])
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var l *clientListen
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if value, ok := currentNode.listenMap.Load(uint32(id)); ok {
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if v, ok := value.(*clientListen); ok && v.typ == "socks5" {
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l = v
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}
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}
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if l == nil {
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c.Println("没有找到ID为", id, "的连接")
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} else {
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l.Close("命令行关闭")
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l.server.Write(common.CMD_DELETE_LISTEN, l.id, nil)
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currentNode.listenMap.Delete(uint32(id))
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}
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},
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})
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rootCli.AddCmd(&ishell.Cmd{
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Name: "socks5",
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Help: "进入socks5功能",
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Func: func(c *ishell.Context) {
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socks5shell.Run()
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},
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})
|
|
}
|
|
func ipToByte(ip string) []byte {
|
|
var b []byte
|
|
|
|
if strings.Contains(ip, ".") {
|
|
for _, s := range strings.Split(ip, ".") {
|
|
i, _ := strconv.Atoi(s)
|
|
b = append(b, byte(i))
|
|
}
|
|
}
|
|
|
|
return b
|
|
}
|
|
func socks5ReadAddr(data []byte) (addr string, port uint16) {
|
|
port = binary.BigEndian.Uint16(data[len(data)-2:])
|
|
switch data[3] {
|
|
case 1: //ipv4
|
|
str := make([][]byte, 4)
|
|
for k, v := range data[4:8] {
|
|
str[k] = []byte(strconv.Itoa(int(v)))
|
|
}
|
|
addr = string(bytes.Join(str, []byte{46}))
|
|
|
|
case 3: //域名
|
|
addr = string(data[5 : len(data)-2])
|
|
|
|
case 4: //ipv6
|
|
strs := make([]string, 0)
|
|
for i := 4; i < 20; i += 2 {
|
|
str := ""
|
|
for j := 0; j < 2; j++ {
|
|
str += fmt.Sprintf("%0.2x", data[i+j])
|
|
}
|
|
str = strings.TrimLeft(str, "0")
|
|
if str == "" {
|
|
str = "0"
|
|
}
|
|
strs = append(strs, str)
|
|
}
|
|
addr = "[" + strings.Join(strs, ":") + "]"
|
|
|
|
default:
|
|
|
|
}
|
|
|
|
return
|
|
}
|