75 lines
1.9 KiB
Go
75 lines
1.9 KiB
Go
package gateway
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import (
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"context"
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"fmt"
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"io"
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"net"
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"next-terminal/server/log"
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)
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type Tunnel struct {
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ID string // 唯一标识
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LocalHost string // 本地监听地址
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LocalPort int // 本地端口
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RemoteHost string // 远程连接地址
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RemotePort int // 远程端口
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Gateway *Gateway
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ctx context.Context
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cancel context.CancelFunc
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listener net.Listener
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localConnections []net.Conn
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remoteConnections []net.Conn
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}
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func (r *Tunnel) Open() {
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localAddr := fmt.Sprintf("%s:%d", r.LocalHost, r.LocalPort)
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go func() {
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<-r.ctx.Done()
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_ = r.listener.Close()
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log.Debugf("SSH 隧道 %v 关闭", localAddr)
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}()
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for {
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log.Debugf("等待客户端访问 %v", localAddr)
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localConn, err := r.listener.Accept()
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if err != nil {
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log.Debugf("接受连接失败 %v, 退出循环", err.Error())
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return
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}
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r.localConnections = append(r.localConnections, localConn)
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log.Debugf("客户端 %v 连接至 %v", localConn.RemoteAddr().String(), localAddr)
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remoteAddr := fmt.Sprintf("%s:%d", r.RemoteHost, r.RemotePort)
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log.Debugf("连接远程主机 %v ...", remoteAddr)
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remoteConn, err := r.Gateway.SshClient.Dial("tcp", remoteAddr)
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if err != nil {
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log.Debugf("连接远程主机 %v 失败", remoteAddr)
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return
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}
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r.remoteConnections = append(r.remoteConnections, remoteConn)
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log.Debugf("连接远程主机 %v 成功", remoteAddr)
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go copyConn(localConn, remoteConn)
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go copyConn(remoteConn, localConn)
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log.Debugf("转发数据 [%v]->[%v]", localAddr, remoteAddr)
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}
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}
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func (r *Tunnel) Close() {
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for i := range r.localConnections {
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_ = r.localConnections[i].Close()
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}
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r.localConnections = nil
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for i := range r.remoteConnections {
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_ = r.remoteConnections[i].Close()
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}
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r.remoteConnections = nil
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r.cancel()
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}
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func copyConn(writer, reader net.Conn) {
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_, _ = io.Copy(writer, reader)
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}
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