mirror of https://github.com/ehang-io/nps
533 lines
12 KiB
Go
Executable File
533 lines
12 KiB
Go
Executable File
package bridge
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import (
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"encoding/binary"
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"errors"
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"fmt"
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"github.com/cnlh/nps/lib/common"
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"github.com/cnlh/nps/lib/conn"
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"github.com/cnlh/nps/lib/crypt"
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"github.com/cnlh/nps/lib/file"
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"github.com/cnlh/nps/lib/pool"
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"github.com/cnlh/nps/lib/version"
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"github.com/cnlh/nps/server/tool"
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"github.com/cnlh/nps/vender/github.com/astaxie/beego/logs"
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"github.com/cnlh/nps/vender/github.com/xtaci/kcp"
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"net"
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"strconv"
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"sync"
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"time"
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)
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type Client struct {
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tunnel *conn.Conn
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signal *conn.Conn
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msg *conn.Conn
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linkMap map[int]*conn.Link
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linkStatusMap map[int]bool
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stop chan bool
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sync.RWMutex
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}
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func NewClient(t *conn.Conn, s *conn.Conn, m *conn.Conn) *Client {
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return &Client{
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linkMap: make(map[int]*conn.Link),
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stop: make(chan bool),
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linkStatusMap: make(map[int]bool),
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signal: s,
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tunnel: t,
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msg: m,
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}
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}
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type Bridge struct {
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TunnelPort int //通信隧道端口
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tcpListener *net.TCPListener //server端监听
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kcpListener *kcp.Listener //server端监听
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Client map[int]*Client
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tunnelType string //bridge type kcp or tcp
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OpenTask chan *file.Tunnel
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CloseClient chan int
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SecretChan chan *conn.Secret
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clientLock sync.RWMutex
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Register map[string]time.Time
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registerLock sync.RWMutex
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ipVerify bool
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runList map[int]interface{}
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}
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func NewTunnel(tunnelPort int, tunnelType string, ipVerify bool, runList map[int]interface{}) *Bridge {
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t := new(Bridge)
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t.TunnelPort = tunnelPort
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t.Client = make(map[int]*Client)
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t.tunnelType = tunnelType
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t.OpenTask = make(chan *file.Tunnel)
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t.CloseClient = make(chan int)
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t.Register = make(map[string]time.Time)
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t.ipVerify = ipVerify
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t.runList = runList
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t.SecretChan = make(chan *conn.Secret)
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return t
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}
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func (s *Bridge) StartTunnel() error {
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go s.linkCleanSession()
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var err error
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if s.tunnelType == "kcp" {
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s.kcpListener, err = kcp.ListenWithOptions(":"+strconv.Itoa(s.TunnelPort), nil, 150, 3)
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if err != nil {
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return err
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}
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go func() {
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for {
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c, err := s.kcpListener.AcceptKCP()
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conn.SetUdpSession(c)
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if err != nil {
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logs.Warn(err)
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continue
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}
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go s.cliProcess(conn.NewConn(c))
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}
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}()
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} else {
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s.tcpListener, err = net.ListenTCP("tcp", &net.TCPAddr{net.ParseIP("0.0.0.0"), s.TunnelPort, ""})
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if err != nil {
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return err
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}
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go func() {
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for {
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c, err := s.tcpListener.Accept()
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if err != nil {
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logs.Warn(err)
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continue
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}
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go s.cliProcess(conn.NewConn(c))
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}
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}()
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}
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return nil
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}
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//验证失败，返回错误验证flag，并且关闭连接
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func (s *Bridge) verifyError(c *conn.Conn) {
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c.Write([]byte(common.VERIFY_EER))
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c.Conn.Close()
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}
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func (s *Bridge) verifySuccess(c *conn.Conn) {
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c.Write([]byte(common.VERIFY_SUCCESS))
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}
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func (s *Bridge) cliProcess(c *conn.Conn) {
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if b, err := c.ReadLen(32); err != nil || string(b) != crypt.Md5(version.GetVersion()) {
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logs.Info("The client %s version does not match", c.Conn.RemoteAddr())
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c.Close()
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return
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}
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c.Write([]byte(crypt.Md5(version.GetVersion())))
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c.SetReadDeadline(5, s.tunnelType)
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var buf []byte
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var err error
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if buf, err = c.ReadLen(32); err != nil {
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c.Close()
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return
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}
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//验证
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id, err := file.GetCsvDb().GetIdByVerifyKey(string(buf), c.Conn.RemoteAddr().String())
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if err != nil {
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logs.Info("Current client connection validation error, close this client:", c.Conn.RemoteAddr())
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s.verifyError(c)
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return
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} else {
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s.verifySuccess(c)
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}
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//做一个判断 添加到对应的channel里面以供使用
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if flag, err := c.ReadFlag(); err == nil {
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s.typeDeal(flag, c, id)
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} else {
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logs.Warn(err, flag)
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}
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return
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}
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func (s *Bridge) closeClient(id int) {
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s.clientLock.Lock()
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defer s.clientLock.Unlock()
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if v, ok := s.Client[id]; ok {
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if c, err := file.GetCsvDb().GetClient(id); err == nil && c.NoStore {
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s.CloseClient <- c.Id
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}
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v.signal.WriteClose()
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delete(s.Client, id)
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}
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}
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func (s *Bridge) delClient(id int) {
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s.clientLock.Lock()
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defer s.clientLock.Unlock()
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if v, ok := s.Client[id]; ok {
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if c, err := file.GetCsvDb().GetClient(id); err == nil && c.NoStore {
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s.CloseClient <- c.Id
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}
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v.signal.Close()
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delete(s.Client, id)
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}
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}
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//tcp连接类型区分
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func (s *Bridge) typeDeal(typeVal string, c *conn.Conn, id int) {
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switch typeVal {
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case common.WORK_MAIN:
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//客户端已经存在，下线
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s.clientLock.Lock()
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if v, ok := s.Client[id]; ok {
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s.clientLock.Unlock()
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if v.signal != nil {
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v.signal.WriteClose()
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}
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v.Lock()
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v.signal = c
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v.Unlock()
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} else {
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s.Client[id] = NewClient(nil, c, nil)
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s.clientLock.Unlock()
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}
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logs.Info("clientId %d connection succeeded, address:%s ", id, c.Conn.RemoteAddr())
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go s.GetStatus(id)
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case common.WORK_CHAN:
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s.clientLock.Lock()
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if v, ok := s.Client[id]; ok {
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s.clientLock.Unlock()
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v.Lock()
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v.tunnel = c
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v.Unlock()
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} else {
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s.Client[id] = NewClient(c, nil, nil)
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s.clientLock.Unlock()
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}
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go s.clientCopy(id)
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case common.WORK_CONFIG:
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go s.GetConfig(c)
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case common.WORK_REGISTER:
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go s.register(c)
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case common.WORD_SECRET:
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if b, err := c.ReadLen(32); err == nil {
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s.SecretChan <- conn.NewSecret(string(b), c)
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}
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case common.WORK_SEND_STATUS:
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s.clientLock.Lock()
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if v, ok := s.Client[id]; ok {
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s.clientLock.Unlock()
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v.Lock()
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v.msg = c
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v.Unlock()
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} else {
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s.Client[id] = NewClient(nil, nil, c)
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s.clientLock.Unlock()
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}
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go s.getMsgStatus(id)
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}
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c.SetAlive(s.tunnelType)
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return
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}
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func (s *Bridge) getMsgStatus(clientId int) {
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s.clientLock.Lock()
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client := s.Client[clientId]
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s.clientLock.Unlock()
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if client == nil {
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return
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}
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for {
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if id, err := client.msg.GetLen(); err != nil {
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s.closeClient(clientId)
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return
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} else {
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client.Lock()
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if v, ok := client.linkMap[id]; ok {
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v.StatusCh <- true
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}
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client.Unlock()
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}
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}
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}
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func (s *Bridge) register(c *conn.Conn) {
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var hour int32
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if err := binary.Read(c, binary.LittleEndian, &hour); err == nil {
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s.registerLock.Lock()
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s.Register[common.GetIpByAddr(c.Conn.RemoteAddr().String())] = time.Now().Add(time.Hour * time.Duration(hour))
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s.registerLock.Unlock()
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}
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}
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//等待
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func (s *Bridge) waitStatus(clientId, id int) bool {
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ticker := time.NewTicker(time.Millisecond * 100)
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stop := time.After(time.Second * 10)
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for {
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select {
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case <-ticker.C:
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s.clientLock.Lock()
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if v, ok := s.Client[clientId]; ok {
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s.clientLock.Unlock()
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v.Lock()
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if vv, ok := v.linkStatusMap[id]; ok {
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ticker.Stop()
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v.Unlock()
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return vv
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}
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v.Unlock()
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} else {
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s.clientLock.Unlock()
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}
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case <-stop:
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return false
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}
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}
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}
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func (s *Bridge) SendLinkInfo(clientId int, link *conn.Link, linkAddr string) (tunnel *conn.Conn, err error) {
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s.clientLock.Lock()
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if v, ok := s.Client[clientId]; ok {
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s.clientLock.Unlock()
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if s.ipVerify {
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s.registerLock.Lock()
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ip := common.GetIpByAddr(linkAddr)
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if v, ok := s.Register[ip]; !ok {
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s.registerLock.Unlock()
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return nil, errors.New(fmt.Sprintf("The ip %s is not in the validation list", ip))
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} else {
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if !v.After(time.Now()) {
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return nil, errors.New(fmt.Sprintf("The validity of the ip %s has expired", ip))
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}
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}
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s.registerLock.Unlock()
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}
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v.signal.SendLinkInfo(link)
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if err != nil {
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logs.Warn("send link information error:", err, link.Id)
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s.DelClient(clientId)
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return
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}
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if v.tunnel == nil {
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err = errors.New("get tunnel connection error")
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return
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} else {
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tunnel = v.tunnel
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}
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link.MsgConn = v.msg
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v.Lock()
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v.linkMap[link.Id] = link
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v.Unlock()
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if !s.waitStatus(clientId, link.Id) {
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err = errors.New(fmt.Sprintf("connect target %s fail", link.Host))
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return
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}
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} else {
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s.clientLock.Unlock()
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err = errors.New(fmt.Sprintf("the client %d is not connect", clientId))
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}
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return
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}
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//删除通信通道
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func (s *Bridge) DelClient(id int) {
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s.closeClient(id)
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}
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//get config
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func (s *Bridge) GetConfig(c *conn.Conn) {
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var client *file.Client
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var fail bool
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for {
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flag, err := c.ReadFlag()
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if err != nil {
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break
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}
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switch flag {
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case common.WORK_STATUS:
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if b, err := c.ReadLen(16); err != nil {
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break
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} else {
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var str string
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id, err := file.GetCsvDb().GetClientIdByVkey(string(b))
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if err != nil {
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break
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}
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for _, v := range file.GetCsvDb().Hosts {
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if v.Client.Id == id {
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str += v.Remark + common.CONN_DATA_SEQ
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}
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}
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for _, v := range file.GetCsvDb().Tasks {
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if _, ok := s.runList[v.Id]; ok && v.Client.Id == id {
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str += v.Remark + common.CONN_DATA_SEQ
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}
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}
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binary.Write(c, binary.LittleEndian, int32(len([]byte(str))))
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binary.Write(c, binary.LittleEndian, []byte(str))
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}
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case common.NEW_CONF:
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var err error
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if client, err = c.GetConfigInfo(); err != nil {
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fail = true
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c.WriteAddFail()
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break
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} else {
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if err = file.GetCsvDb().NewClient(client); err != nil {
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fail = true
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c.WriteAddFail()
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break
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}
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c.WriteAddOk()
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c.Write([]byte(client.VerifyKey))
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}
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case common.NEW_HOST:
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if h, err := c.GetHostInfo(); err != nil {
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fail = true
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c.WriteAddFail()
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break
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} else if file.GetCsvDb().IsHostExist(h) {
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fail = true
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c.WriteAddFail()
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break
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} else {
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h.Client = client
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file.GetCsvDb().NewHost(h)
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c.WriteAddOk()
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}
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case common.NEW_TASK:
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if t, err := c.GetTaskInfo(); err != nil {
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fail = true
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c.WriteAddFail()
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break
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} else {
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ports := common.GetPorts(t.Ports)
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targets := common.GetPorts(t.Target)
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if len(ports) > 1 && (t.Mode == "tcpServer" || t.Mode == "udpServer") && (len(ports) != len(targets)) {
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fail = true
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c.WriteAddFail()
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break
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} else if t.Mode == "secretServer" {
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ports = append(ports, 0)
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}
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if len(ports) == 0 {
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fail = true
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c.WriteAddFail()
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break
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}
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for i := 0; i < len(ports); i++ {
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tl := new(file.Tunnel)
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tl.Mode = t.Mode
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tl.Port = ports[i]
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if len(ports) == 1 {
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tl.Target = t.Target
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tl.Remark = t.Remark
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} else {
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tl.Remark = t.Remark + "_" + strconv.Itoa(tl.Port)
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tl.Target = t.TargetAddr + ":" + strconv.Itoa(targets[i])
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}
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tl.Id = file.GetCsvDb().GetTaskId()
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tl.Status = true
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tl.Flow = new(file.Flow)
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tl.NoStore = true
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tl.Client = client
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tl.Password = t.Password
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if err := file.GetCsvDb().NewTask(tl); err != nil {
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logs.Notice("Add task error ", err.Error())
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fail = true
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c.WriteAddFail()
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break
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}
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if b := tool.TestServerPort(tl.Port, tl.Mode); !b && t.Mode != "secretServer" {
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fail = true
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c.WriteAddFail()
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break
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} else {
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s.OpenTask <- tl
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}
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c.WriteAddOk()
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}
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}
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}
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}
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if fail && client != nil {
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s.CloseClient <- client.Id
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}
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c.Close()
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}
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func (s *Bridge) GetStatus(clientId int) {
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s.clientLock.Lock()
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client := s.Client[clientId]
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s.clientLock.Unlock()
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if client == nil {
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return
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}
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for {
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if id, status, err := client.signal.GetConnStatus(); err != nil {
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s.closeClient(clientId)
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return
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} else {
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client.Lock()
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client.linkStatusMap[id] = status
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client.Unlock()
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}
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}
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}
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func (s *Bridge) clientCopy(clientId int) {
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s.clientLock.Lock()
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client := s.Client[clientId]
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s.clientLock.Unlock()
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for {
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if id, err := client.tunnel.GetLen(); err != nil {
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logs.Info("read msg content length error close client")
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s.delClient(clientId)
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break
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} else {
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client.Lock()
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if link, ok := client.linkMap[id]; ok {
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client.Unlock()
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if content, err := client.tunnel.GetMsgContent(link); err != nil {
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pool.PutBufPoolCopy(content)
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s.delClient(clientId)
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logs.Notice("read msg content error", err, "close client")
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break
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} else {
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link.MsgCh <- content
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}
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} else {
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client.Unlock()
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continue
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}
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}
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}
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}
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func (s *Bridge) linkCleanSession() {
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ticker := time.NewTicker(time.Minute * 5)
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for {
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select {
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case <-ticker.C:
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s.clientLock.Lock()
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for _, v := range s.Client {
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v.Lock()
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for _, vv := range v.linkMap {
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if vv.FinishUse {
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delete(v.linkMap, vv.Id)
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}
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}
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v.Unlock()
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}
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s.clientLock.RUnlock()
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}
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}
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}
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