timamsk/sing-box
1
0
Fork 0
mirror of https://github.com/SagerNet/sing-box.git synced 2026-04-13 20:28:32 +10:00
Code Issues Packages Projects Releases Wiki Activity

Refine tproxy write back

Browse Source
This commit is contained in:
世界
2022-09-25 17:13:42 +08:00
parent 17b5f031f1
commit cbab86ae38
3 changed files with 43 additions and 103 deletions
Download Patch File Download Diff File Expand all files Collapse all files

93
common/redir/tproxy_linux.go
View File

@@ -2,14 +2,11 @@ package redir
import (
"encoding/binary"
"net"
"net/netip"
"os"
"strconv"
"syscall"
"github.com/sagernet/sing/common/control"
E "github.com/sagernet/sing/common/exceptions"
F "github.com/sagernet/sing/common/format"
M "github.com/sagernet/sing/common/metadata"
"golang.org/x/sys/unix"
@@ -32,6 +29,18 @@ func TProxy(fd uintptr, isIPv6 bool) error {
return err
}
func TProxyWriteBack() control.Func {
return func(network, address string, conn syscall.RawConn) error {
return control.Raw(conn, func(fd uintptr) error {
if M.ParseSocksaddr(address).Addr.Is6() {
return syscall.SetsockoptInt(int(fd), syscall.SOL_IPV6, unix.IPV6_TRANSPARENT, 1)
} else {
return syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_TRANSPARENT, 1)
}
})
}
}
func GetOriginalDestinationFromOOB(oob []byte) (netip.AddrPort, error) {
controlMessages, err := unix.ParseSocketControlMessage(oob)
if err != nil {
@@ -46,79 +55,3 @@ func GetOriginalDestinationFromOOB(oob []byte) (netip.AddrPort, error) {
}
return netip.AddrPort{}, E.New("not found")
}
func DialUDP(lAddr *net.UDPAddr, rAddr *net.UDPAddr) (*net.UDPConn, error) {
rSockAddr, err := udpAddrToSockAddr(rAddr)
if err != nil {
return nil, err
}
lSockAddr, err := udpAddrToSockAddr(lAddr)
if err != nil {
return nil, err
}
fd, err := syscall.Socket(udpAddrFamily(lAddr, rAddr), syscall.SOCK_DGRAM, 0)
if err != nil {
return nil, err
}
if err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
syscall.Close(fd)
return nil, err
}
if err = syscall.SetsockoptInt(fd, syscall.SOL_IP, syscall.IP_TRANSPARENT, 1); err != nil {
syscall.Close(fd)
return nil, err
}
if err = syscall.Bind(fd, lSockAddr); err != nil {
syscall.Close(fd)
return nil, err
}
if err = syscall.Connect(fd, rSockAddr); err != nil {
syscall.Close(fd)
return nil, err
}
fdFile := os.NewFile(uintptr(fd), F.ToString("net-udp-dial-", rAddr))
defer fdFile.Close()
c, err := net.FileConn(fdFile)
if err != nil {
syscall.Close(fd)
return nil, err
}
return c.(*net.UDPConn), nil
}
func udpAddrToSockAddr(addr *net.UDPAddr) (syscall.Sockaddr, error) {
switch {
case addr.IP.To4() != nil:
ip := [4]byte{}
copy(ip[:], addr.IP.To4())
return &syscall.SockaddrInet4{Addr: ip, Port: addr.Port}, nil
default:
ip := [16]byte{}
copy(ip[:], addr.IP.To16())
zoneID, err := strconv.ParseUint(addr.Zone, 10, 32)
if err != nil {
zoneID = 0
}
return &syscall.SockaddrInet6{Addr: ip, Port: addr.Port, ZoneId: uint32(zoneID)}, nil
}
}
func udpAddrFamily(lAddr, rAddr *net.UDPAddr) int {
if (lAddr == nil || lAddr.IP.To4() != nil) && (rAddr == nil || lAddr.IP.To4() != nil) {
return syscall.AF_INET
}
return syscall.AF_INET6
}

11
common/redir/tproxy_other.go
View File

@@ -3,19 +3,20 @@
package redir
import (
"net"
"net/netip"
"os"
"github.com/sagernet/sing/common/control"
)
func TProxy(fd uintptr, isIPv6 bool) error {
return os.ErrInvalid
}
func TProxyWriteBack() control.Func {
return nil
}
func GetOriginalDestinationFromOOB(oob []byte) (netip.AddrPort, error) {
return netip.AddrPort{}, os.ErrInvalid
}
func DialUDP(lAddr *net.UDPAddr, rAddr *net.UDPAddr) (*net.UDPConn, error) {
return nil, os.ErrInvalid
}