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tcptun.go
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/
tcptun.go
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package main
import "net"
// TCPTun struct
type TCPTun struct {
dialer Dialer
addr string
raddr string
}
// NewTCPTun returns a tcptun proxy.
func NewTCPTun(addr, raddr string, dialer Dialer) (*TCPTun, error) {
s := &TCPTun{
dialer: dialer,
addr: addr,
raddr: raddr,
}
return s, nil
}
// ListenAndServe .
func (s *TCPTun) ListenAndServe() {
l, err := net.Listen("tcp", s.addr)
if err != nil {
logf("failed to listen on %s: %v", s.addr, err)
return
}
logf("listening TCP on %s", s.addr)
for {
c, err := l.Accept()
if err != nil {
logf("failed to accept: %v", err)
continue
}
go func() {
defer c.Close()
if c, ok := c.(*net.TCPConn); ok {
c.SetKeepAlive(true)
}
rc, err := s.dialer.Dial("tcp", s.raddr)
if err != nil {
logf("failed to connect to target: %v", err)
return
}
defer rc.Close()
logf("proxy-tcptun %s <-> %s", c.RemoteAddr(), s.raddr)
_, _, err = relay(c, rc)
if err != nil {
if err, ok := err.(net.Error); ok && err.Timeout() {
return // ignore i/o timeout
}
logf("relay error: %v", err)
}
}()
}
}