func clientHandler(f base.ClientFactory, conn net.Conn, proxyURI *url.URL) {
defer conn.Close()
termMon.onHandlerStart()
defer termMon.onHandlerFinish()
name := f.Transport().Name()
// Read the client's SOCKS handshake.
socksReq, err := socks5.Handshake(conn)
if err != nil {
log.Errorf("%s - client failed socks handshake: %s", name, err)
return
}
addrStr := log.ElideAddr(socksReq.Target)
// Deal with arguments.
args, err := f.ParseArgs(&socksReq.Args)
if err != nil {
log.Errorf("%s(%s) - invalid arguments: %s", name, addrStr, err)
socksReq.Reply(socks5.ReplyGeneralFailure)
return
}
// Obtain the proxy dialer if any, and create the outgoing TCP connection.
dialFn := proxy.Direct.Dial
if proxyURI != nil {
dialer, err := proxy.FromURL(proxyURI, proxy.Direct)
if err != nil {
// This should basically never happen, since config protocol
// verifies this.
log.Errorf("%s(%s) - failed to obtain proxy dialer: %s", name, addrStr, log.ElideError(err))
socksReq.Reply(socks5.ReplyGeneralFailure)
return
}
dialFn = dialer.Dial
}
remoteConn, err := dialFn("tcp", socksReq.Target) // XXX: Allow UDP?
if err != nil {
log.Errorf("%s(%s) - outgoing connection failed: %s", name, addrStr, log.ElideError(err))
socksReq.Reply(socks5.ErrorToReplyCode(err))
return
}
defer remoteConn.Close()
// Instantiate the client transport method, handshake, and start pushing
// bytes back and forth.
remote, err := f.WrapConn(remoteConn, args)
if err != nil {
log.Errorf("%s(%s) - handshake failed: %s", name, addrStr, log.ElideError(err))
socksReq.Reply(socks5.ReplyGeneralFailure)
return
}
err = socksReq.Reply(socks5.ReplySucceeded)
if err != nil {
log.Errorf("%s(%s) - SOCKS reply failed: %s", name, addrStr, log.ElideError(err))
return
}
if err = copyLoop(conn, remote); err != nil {
log.Warnf("%s(%s) - closed connection: %s", name, addrStr, log.ElideError(err))
} else {
log.Infof("%s(%s) - closed connection", name, addrStr)
}
return
}
func clientHandler(f base.ClientFactory, conn *pt.SocksConn, proxyURI *url.URL) {
defer conn.Close()
termMon.onHandlerStart()
defer termMon.onHandlerFinish()
name := f.Transport().Name()
addrStr := log.ElideAddr(conn.Req.Target)
log.Infof("%s(%s) - new connection", name, addrStr)
// Deal with arguments.
args, err := f.ParseArgs(&conn.Req.Args)
if err != nil {
log.Errorf("%s(%s) - invalid arguments: %s", name, addrStr, err)
conn.Reject()
return
}
// Obtain the proxy dialer if any, and create the outgoing TCP connection.
var dialFn DialFn
if proxyURI == nil {
dialFn = proxy.Direct.Dial
} else {
// This is unlikely to happen as the proxy protocol is verified during
// the configuration phase.
dialer, err := proxy.FromURL(proxyURI, proxy.Direct)
if err != nil {
log.Errorf("%s(%s) - failed to obtain proxy dialer: %s", name, addrStr, log.ElideError(err))
conn.Reject()
return
}
dialFn = dialer.Dial
}
remoteConn, err := dialFn("tcp", conn.Req.Target) // XXX: Allow UDP?
if err != nil {
log.Errorf("%s(%s) - outgoing connection failed: %s", name, addrStr, log.ElideError(err))
conn.Reject()
return
}
defer remoteConn.Close()
// Instantiate the client transport method, handshake, and start pushing
// bytes back and forth.
remote, err := f.WrapConn(remoteConn, args)
if err != nil {
log.Errorf("%s(%s) - handshake failed: %s", name, addrStr, log.ElideError(err))
conn.Reject()
return
}
err = conn.Grant(remoteConn.RemoteAddr().(*net.TCPAddr))
if err != nil {
log.Errorf("%s(%s) - SOCKS grant failed: %s", name, addrStr, log.ElideError(err))
return
}
if err = copyLoop(conn, remote); err != nil {
log.Warnf("%s(%s) - closed connection: %s", name, addrStr, log.ElideError(err))
} else {
log.Infof("%s(%s) - closed connection", name, addrStr)
}
return
}