mirror of https://github.com/ehang-io/nps
45 lines
961 B
Go
45 lines
961 B
Go
// +build !windows
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package proxy
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import (
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"net"
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"strconv"
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"syscall"
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"ehang.io/nps/lib/common"
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"ehang.io/nps/lib/conn"
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)
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func HandleTrans(c *conn.Conn, s *TunnelModeServer) error {
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if addr, err := getAddress(c.Conn); err != nil {
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return err
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} else {
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return s.DealClient(c, s.task.Client, addr, nil, common.CONN_TCP, nil, s.task.Flow, s.task.Target.LocalProxy)
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}
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}
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const SO_ORIGINAL_DST = 80
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func getAddress(conn net.Conn) (string, error) {
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sysrawconn, f := conn.(syscall.Conn)
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if !f {
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return "", nil
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}
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rawConn, err := sysrawconn.SyscallConn()
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if err != nil {
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return "", nil
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}
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var ip string
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var port uint16
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err = rawConn.Control(func(fd uintptr) {
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addr, err := syscall.GetsockoptIPv6Mreq(int(fd), syscall.IPPROTO_IP, SO_ORIGINAL_DST)
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if err != nil {
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return
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}
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ip = net.IP(addr.Multiaddr[4:8]).String()
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port = uint16(addr.Multiaddr[2])<<8 + uint16(addr.Multiaddr[3])
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})
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return ip + ":" + strconv.Itoa(int(port)), nil
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}
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