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Chore: update tproxy udp packet read logic

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This commit is contained in:
Dreamacro 2022-06-12 19:37:27 +08:00
parent 06d75da257
commit 2fa1a5c4b9
6 changed files with 71 additions and 53 deletions
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7
listener/tproxy/packet.go
View file

@ -2,12 +2,13 @@ package tproxy
import (
"net"
"net/netip"
"github.com/Dreamacro/clash/common/pool"
)
type packet struct {
lAddr *net.UDPAddr
lAddr netip.AddrPort
buf []byte
}
@ -17,7 +18,7 @@ func (c *packet) Data() []byte {
// WriteBack opens a new socket binding `addr` to write UDP packet back
func (c *packet) WriteBack(b []byte, addr net.Addr) (n int, err error) {
tc, err := dialUDP("udp", addr.(*net.UDPAddr), c.lAddr)
tc, err := dialUDP("udp", addr.(*net.UDPAddr).AddrPort(), c.lAddr)
if err != nil {
n = 0
return
@ -29,7 +30,7 @@ func (c *packet) WriteBack(b []byte, addr net.Addr) (n int, err error) {
// LocalAddr returns the source IP/Port of UDP Packet
func (c *packet) LocalAddr() net.Addr {
return c.lAddr
return &net.UDPAddr{IP: c.lAddr.Addr().AsSlice(), Port: int(c.lAddr.Port()), Zone: c.lAddr.Addr().Zone()}
}
func (c *packet) Drop() {

0
listener/tproxy/tproxy.go → listener/tproxy/tcp.go
View file

11
listener/tproxy/udp.go
View file

@ -2,6 +2,7 @@ package tproxy
import (
"net"
"net/netip"
"github.com/Dreamacro/clash/adapter/inbound"
"github.com/Dreamacro/clash/common/pool"
@ -58,7 +59,7 @@ func NewUDP(addr string, in chan<- *inbound.PacketAdapter) (*UDPListener, error)
oob := make([]byte, 1024)
for {
buf := pool.Get(pool.UDPBufferSize)
n, oobn, _, lAddr, err := c.ReadMsgUDP(buf, oob)
n, oobn, _, lAddr, err := c.ReadMsgUDPAddrPort(buf, oob)
if err != nil {
pool.Put(buf)
if rl.closed {
@ -67,19 +68,19 @@ func NewUDP(addr string, in chan<- *inbound.PacketAdapter) (*UDPListener, error)
continue
}
rAddr, err := getOrigDst(oob, oobn)
rAddr, err := getOrigDst(oob[:oobn])
if err != nil {
continue
}
handlePacketConn(l, in, buf[:n], lAddr, rAddr)
handlePacketConn(in, buf[:n], lAddr, rAddr)
}
}()
return rl, nil
}
func handlePacketConn(pc net.PacketConn, in chan<- *inbound.PacketAdapter, buf []byte, lAddr *net.UDPAddr, rAddr *net.UDPAddr) {
target := socks5.ParseAddrToSocksAddr(rAddr)
func handlePacketConn(in chan<- *inbound.PacketAdapter, buf []byte, lAddr, rAddr netip.AddrPort) {
target := socks5.AddrFromStdAddrPort(rAddr)
pkt := &packet{
lAddr: lAddr,
buf: buf,

84
listener/tproxy/udp_linux.go
View file

@ -3,13 +3,14 @@
package tproxy
import (
"encoding/binary"
"errors"
"fmt"
"net"
"net/netip"
"os"
"strconv"
"syscall"
"golang.org/x/sys/unix"
)
const (
@ -19,7 +20,7 @@ const (
// dialUDP acts like net.DialUDP for transparent proxy.
// It binds to a non-local address(`lAddr`).
func dialUDP(network string, lAddr *net.UDPAddr, rAddr *net.UDPAddr) (*net.UDPConn, error) {
func dialUDP(network string, lAddr, rAddr netip.AddrPort) (uc *net.UDPConn, err error) {
rSockAddr, err := udpAddrToSockAddr(rAddr)
if err != nil {
return nil, err
@ -35,23 +36,25 @@ func dialUDP(network string, lAddr *net.UDPAddr, rAddr *net.UDPAddr) (*net.UDPCo
return nil, err
}
defer func() {
if err != nil {
syscall.Close(fd)
}
}()
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
}
@ -60,35 +63,26 @@ func dialUDP(network string, lAddr *net.UDPAddr, rAddr *net.UDPAddr) (*net.UDPCo
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 udpAddrToSockAddr(addr netip.AddrPort) (syscall.Sockaddr, error) {
if addr.Addr().Is4() {
return &syscall.SockaddrInet4{Addr: addr.Addr().As4(), Port: int(addr.Port())}, nil
}
zoneID, err := strconv.ParseUint(addr.Addr().Zone(), 10, 32)
if err != nil {
zoneID = 0
}
return &syscall.SockaddrInet6{Addr: addr.Addr().As16(), Port: int(addr.Port()), ZoneId: uint32(zoneID)}, nil
}
func udpAddrFamily(net string, lAddr, rAddr *net.UDPAddr) int {
func udpAddrFamily(net string, lAddr, rAddr netip.AddrPort) int {
switch net[len(net)-1] {
case '4':
return syscall.AF_INET
@ -96,29 +90,35 @@ func udpAddrFamily(net string, lAddr, rAddr *net.UDPAddr) int {
return syscall.AF_INET6
}
if (lAddr == nil || lAddr.IP.To4() != nil) && (rAddr == nil || lAddr.IP.To4() != nil) {
if lAddr.Addr().Is4() && rAddr.Addr().Is4() {
return syscall.AF_INET
}
return syscall.AF_INET6
}
func getOrigDst(oob []byte, oobn int) (*net.UDPAddr, error) {
msgs, err := syscall.ParseSocketControlMessage(oob[:oobn])
func getOrigDst(oob []byte) (netip.AddrPort, error) {
// oob contains socket control messages which we need to parse.
scms, err := unix.ParseSocketControlMessage(oob)
if err != nil {
return nil, err
return netip.AddrPort{}, fmt.Errorf("parse control message: %w", err)
}
for _, msg := range msgs {
if msg.Header.Level == syscall.SOL_IP && msg.Header.Type == syscall.IP_RECVORIGDSTADDR {
ip := net.IP(msg.Data[4:8])
port := binary.BigEndian.Uint16(msg.Data[2:4])
return &net.UDPAddr{IP: ip, Port: int(port)}, nil
} else if msg.Header.Level == syscall.SOL_IPV6 && msg.Header.Type == IPV6_RECVORIGDSTADDR {
ip := net.IP(msg.Data[8:24])
port := binary.BigEndian.Uint16(msg.Data[2:4])
return &net.UDPAddr{IP: ip, Port: int(port)}, nil
}
// retrieve the destination address from the SCM.
sa, err := unix.ParseOrigDstAddr(&scms[0])
if err != nil {
return netip.AddrPort{}, fmt.Errorf("retrieve destination: %w", err)
}
return nil, errors.New("cannot find origDst")
// encode the destination address into a cmsg.
var rAddr netip.AddrPort
switch v := sa.(type) {
case *unix.SockaddrInet4:
rAddr = netip.AddrPortFrom(netip.AddrFrom4(v.Addr), uint16(v.Port))
case *unix.SockaddrInet6:
rAddr = netip.AddrPortFrom(netip.AddrFrom16(v.Addr), uint16(v.Port))
default:
return netip.AddrPort{}, fmt.Errorf("unsupported address type: %T", v)
}
return rAddr, nil
}

7
listener/tproxy/udp_other.go
View file

@ -5,12 +5,13 @@ package tproxy
import (
"errors"
"net"
"net/netip"
)
func getOrigDst(oob []byte, oobn int) (*net.UDPAddr, error) {
return nil, errors.New("UDP redir not supported on current platform")
func getOrigDst(oob []byte) (netip.AddrPort, error) {
return netip.AddrPort{}, errors.New("UDP redir not supported on current platform")
}
func dialUDP(network string, lAddr *net.UDPAddr, rAddr *net.UDPAddr) (*net.UDPConn, error) {
func dialUDP(network string, lAddr, rAddr netip.AddrPort) (*net.UDPConn, error) {
return nil, errors.New("UDP redir not supported on current platform")
}

15
transport/socks5/socks5.go
View file

@ -398,6 +398,21 @@ func ParseAddrToSocksAddr(addr net.Addr) Addr {
return parsed
}
func AddrFromStdAddrPort(addrPort netip.AddrPort) Addr {
addr := addrPort.Addr()
if addr.Is4() {
ip4 := addr.As4()
return []byte{AtypIPv4, ip4[0], ip4[1], ip4[2], ip4[3], byte(addrPort.Port() >> 8), byte(addrPort.Port())}
}
buf := make([]byte, 1+net.IPv6len+2)
buf[0] = AtypIPv6
copy(buf[1:], addr.AsSlice())
buf[1+net.IPv6len] = byte(addrPort.Port() >> 8)
buf[1+net.IPv6len+1] = byte(addrPort.Port())
return buf
}
// DecodeUDPPacket split `packet` to addr payload, and this function is mutable with `packet`
func DecodeUDPPacket(packet []byte) (addr Addr, payload []byte, err error) {
if len(packet) < 5 {