mirror of https://github.com/v2ray/v2ray-core
33 lines
829 B
Go
33 lines
829 B
Go
// +build linux
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package tcp
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import (
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"net"
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"syscall"
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"v2ray.com/core/app/log"
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v2net "v2ray.com/core/common/net"
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"v2ray.com/core/transport/internet"
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"v2ray.com/core/transport/internet/internal"
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)
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const SO_ORIGINAL_DST = 80
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func GetOriginalDestination(conn internet.Connection) v2net.Destination {
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fd, err := internal.GetSysFd(conn.(net.Conn))
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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 v2net.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 v2net.Destination{}
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}
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ip := v2net.IPAddress(addr.Multiaddr[4:8])
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port := uint16(addr.Multiaddr[2])<<8 + uint16(addr.Multiaddr[3])
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return v2net.TCPDestination(ip, v2net.Port(port))
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}
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