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Feature: add TCP TPROXY support (#1049)

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This commit is contained in:
maskedeken
2020-11-09 10:46:10 +08:00
committed by GitHub
parent 87e4d94290
commit 83efe2ae57
11 changed files with 207 additions and 57 deletions
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37
proxy/redir/udp_linux.go
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@ -14,43 +14,6 @@ const (
IPV6_RECVORIGDSTADDR = 0x4a
)
func setsockopt(c *net.UDPConn, addr string) error {
isIPv6 := true
host, _, err := net.SplitHostPort(addr)
if err != nil {
return err
}
ip := net.ParseIP(host)
if ip != nil && ip.To4() != nil {
isIPv6 = false
}
rc, err := c.SyscallConn()
if err != nil {
return err
}
rc.Control(func(fd uintptr) {
err = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
if err == nil {
err = syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_TRANSPARENT, 1)
}
if err == nil && isIPv6 {
err = syscall.SetsockoptInt(int(fd), syscall.SOL_IPV6, IPV6_TRANSPARENT, 1)
}
if err == nil {
err = syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_RECVORIGDSTADDR, 1)
}
if err == nil && isIPv6 {
err = syscall.SetsockoptInt(int(fd), syscall.SOL_IPV6, IPV6_RECVORIGDSTADDR, 1)
}
})
return err
}
func getOrigDst(oob []byte, oobn int) (*net.UDPAddr, error) {
msgs, err := syscall.ParseSocketControlMessage(oob[:oobn])
if err != nil {