mirror of https://github.com/v2ray/v2ray-core
36 lines
863 B
Go
36 lines
863 B
Go
// +build linux
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package tcp
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import (
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"syscall"
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"v2ray.com/core/app/log"
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"v2ray.com/core/common/net"
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"v2ray.com/core/transport/internet"
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)
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const SO_ORIGINAL_DST = 80
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func GetOriginalDestination(conn internet.Connection) net.Destination {
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tcpConn, ok := conn.(internet.SysFd)
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if !ok {
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log.Trace(newError("failed to get sys fd"))
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return net.Destination{}
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}
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fd, err := tcpConn.SysFd()
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if err != nil {
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log.Trace(newError("failed to get original destination").Base(err))
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return net.Destination{}
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}
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addr, err := syscall.GetsockoptIPv6Mreq(fd, syscall.IPPROTO_IP, SO_ORIGINAL_DST)
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if err != nil {
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log.Trace(newError("failed to call getsockopt").Base(err))
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return net.Destination{}
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}
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ip := net.IPAddress(addr.Multiaddr[4:8])
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port := uint16(addr.Multiaddr[2])<<8 + uint16(addr.Multiaddr[3])
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return net.TCPDestination(ip, net.Port(port))
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}
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