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sockopt_linux.go
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/
sockopt_linux.go
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// +build linux
package dokodemo
import (
"syscall"
"github.com/v2ray/v2ray-core/common/log"
v2net "github.com/v2ray/v2ray-core/common/net"
"github.com/v2ray/v2ray-core/transport/internet"
"github.com/v2ray/v2ray-core/transport/internet/tcp"
)
const SO_ORIGINAL_DST = 80
func GetOriginalDestination(conn internet.Connection) v2net.Destination {
tcpConn := conn.(*tcp.Connection)
fd, err := tcpConn.SysFd()
if err != nil {
log.Info("Dokodemo: Failed to get original destination: ", err)
return nil
}
addr, err := syscall.GetsockoptIPv6Mreq(fd, syscall.IPPROTO_IP, SO_ORIGINAL_DST)
if err != nil {
log.Info("Dokodemo: Failed to call getsockopt: ", err)
return nil
}
ip := v2net.IPAddress(addr.Multiaddr[4:8])
port := uint16(addr.Multiaddr[2])<<8 + uint16(addr.Multiaddr[3])
return v2net.TCPDestination(ip, v2net.Port(port))
}