mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-09 18:43:14 +00:00
58 lines
1.9 KiB
Go
58 lines
1.9 KiB
Go
package redir
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import (
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"encoding/binary"
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"net/netip"
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"syscall"
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"github.com/sagernet/sing/common/control"
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E "github.com/sagernet/sing/common/exceptions"
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M "github.com/sagernet/sing/common/metadata"
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"golang.org/x/sys/unix"
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)
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func TProxy(fd uintptr, isIPv6 bool) error {
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err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
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if err == nil {
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err = syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_TRANSPARENT, 1)
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}
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if err == nil && isIPv6 {
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err = syscall.SetsockoptInt(int(fd), syscall.SOL_IPV6, unix.IPV6_TRANSPARENT, 1)
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}
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if err == nil {
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err = syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_RECVORIGDSTADDR, 1)
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}
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if err == nil && isIPv6 {
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err = syscall.SetsockoptInt(int(fd), syscall.SOL_IPV6, unix.IPV6_RECVORIGDSTADDR, 1)
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}
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return err
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}
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func TProxyWriteBack() control.Func {
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return func(network, address string, conn syscall.RawConn) error {
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return control.Raw(conn, func(fd uintptr) error {
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if M.ParseSocksaddr(address).Addr.Is6() {
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return syscall.SetsockoptInt(int(fd), syscall.SOL_IPV6, unix.IPV6_TRANSPARENT, 1)
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} else {
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return syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_TRANSPARENT, 1)
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}
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})
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}
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}
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func GetOriginalDestinationFromOOB(oob []byte) (netip.AddrPort, error) {
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controlMessages, err := unix.ParseSocketControlMessage(oob)
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if err != nil {
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return netip.AddrPort{}, err
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}
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for _, message := range controlMessages {
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if message.Header.Level == unix.SOL_IP && message.Header.Type == unix.IP_RECVORIGDSTADDR {
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return netip.AddrPortFrom(M.AddrFromIP(message.Data[4:8]), binary.BigEndian.Uint16(message.Data[2:4])), nil
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} else if message.Header.Level == unix.SOL_IPV6 && message.Header.Type == unix.IPV6_RECVORIGDSTADDR {
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return netip.AddrPortFrom(M.AddrFromIP(message.Data[8:24]), binary.BigEndian.Uint16(message.Data[2:4])), nil
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}
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}
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return netip.AddrPort{}, E.New("not found")
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}
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