Add "tproxy" option (#1189)

* Add "tproxy" option
Added the function of "MacOS" FreeBSD firewall traffic forwarding and resolving destination address
example:
  "inbounds": [
    {
      "listen": "127.0.0.1",
      "port": 1122,
      "protocol": "dokodemo-door",
      "tag": "dokodemo",
      "settings": {
        "network": "tcp",
        "followRedirect": true,
        "userLevel": 0
      },
      "streamSettings": {
        "sockopt": {
          "tproxy": "pf"
        }
      }
    }
  ]

* Add "tproxy" option
Added the function of "MacOS" FreeBSD firewall traffic forwarding and resolving destination address
example:
  "inbounds": [
    {
      "listen": "127.0.0.1",
      "port": 1122,
      "protocol": "dokodemo-door",
      "tag": "dokodemo",
      "settings": {
        "network": "tcp",
        "followRedirect": true,
        "userLevel": 0
      },
      "streamSettings": {
        "sockopt": {
          "tproxy": "pf"
        }
      }
    }
  ]

* Add "tproxy" option
Added the function of "MacOS" FreeBSD firewall traffic forwarding and resolving destination address
example:
  "inbounds": [
    {
      "listen": "127.0.0.1",
      "port": 1122,
      "protocol": "dokodemo-door",
      "tag": "dokodemo",
      "settings": {
        "network": "tcp",
        "followRedirect": true,
        "userLevel": 0
      },
      "streamSettings": {
        "sockopt": {
          "tproxy": "pf"
        }
      }
    }
  ]

Co-authored-by: Mocking <fanhaiwang0817@gmail.com>
This commit is contained in:
S-Mocking 2022-08-20 21:02:18 +08:00 committed by GitHub
parent 76638d793c
commit 59602db02d
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 138 additions and 21 deletions

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@ -72,6 +72,13 @@ func (w *tcpWorker) callback(conn stat.Connection) {
}
case internet.SocketConfig_TProxy:
dest = net.DestinationFromAddr(conn.LocalAddr())
case internet.SocketConfig_PF:
d, err := net.OriginalDst(conn)
if err != nil {
newError("failed to get original destination").Base(err).WriteToLog(session.ExportIDToError(ctx))
} else {
dest = d
}
}
if dest.IsValid() {
ctx = session.ContextWithOutbound(ctx, &session.Outbound{

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@ -0,0 +1,94 @@
//go:build darwin
package net
import (
"net"
"os"
"syscall"
"unsafe"
)
const (
PfOut = 2
IOCOut = 0x40000000
IOCIn = 0x80000000
IOCInOut = IOCIn | IOCOut
IOCPARMMask = 0x1FFF
LEN = 4*16 + 4*4 + 4*1
// #define _IOC(inout,group,num,len) (inout | ((len & IOCPARMMask) << 16) | ((group) << 8) | (num))
// #define _IOWR(g,n,t) _IOC(IOCInOut, (g), (n), sizeof(t))
// #define DIOCNATLOOK _IOWR('D', 23, struct pfioc_natlook)
DIOCNATLOOK = IOCInOut | ((LEN & IOCPARMMask) << 16) | ('D' << 8) | 23
)
// OriginalDst uses ioctl to read original destination from /dev/pf
func OriginalDst(conn Conn) (Destination, error) {
f, err := os.Open("/dev/pf")
if err != nil {
return Destination{}, newError("failed to open device /dev/pf").Base(err)
}
defer f.Close()
fd := f.Fd()
nl := struct { // struct pfioc_natlook
saddr, daddr, rsaddr, rdaddr [16]byte
sxport, dxport, rsxport, rdxport [4]byte
af, proto, protoVariant, direction uint8
}{
af: syscall.AF_INET,
proto: syscall.IPPROTO_TCP,
direction: PfOut,
}
var raIP, laIP net.IP
var raPort, laPort int
la := conn.LocalAddr()
ra := conn.RemoteAddr()
switch la.(type) {
case *net.TCPAddr:
raIP = ra.(*net.TCPAddr).IP
laIP = la.(*net.TCPAddr).IP
raPort = ra.(*net.TCPAddr).Port
laPort = la.(*net.TCPAddr).Port
case *net.UDPAddr:
raIP = ra.(*net.UDPAddr).IP
laIP = la.(*net.UDPAddr).IP
raPort = ra.(*net.UDPAddr).Port
laPort = la.(*net.UDPAddr).Port
}
if raIP.To4() != nil {
if laIP.IsUnspecified() {
laIP = net.ParseIP("127.0.0.1")
}
copy(nl.saddr[:net.IPv4len], raIP.To4())
copy(nl.daddr[:net.IPv4len], laIP.To4())
}
if raIP.To16() != nil && raIP.To4() == nil {
if laIP.IsUnspecified() {
laIP = net.ParseIP("::1")
}
copy(nl.saddr[:], raIP)
copy(nl.daddr[:], laIP)
}
nl.sxport[0], nl.sxport[1] = byte(raPort>>8), byte(raPort)
nl.dxport[0], nl.dxport[1] = byte(laPort>>8), byte(laPort)
if _, _, errno := syscall.Syscall(syscall.SYS_IOCTL, fd, DIOCNATLOOK, uintptr(unsafe.Pointer(&nl))); errno != 0 {
return Destination{}, os.NewSyscallError("ioctl", err)
}
odPort := nl.rdxport
var odIP net.IP
switch nl.af {
case syscall.AF_INET:
odIP = make(net.IP, net.IPv4len)
copy(odIP, nl.rdaddr[:net.IPv4len])
case syscall.AF_INET6:
odIP = make(net.IP, net.IPv6len)
copy(odIP, nl.rdaddr[:])
}
return Destination{
Address: IPAddress(odIP),
Port: PortFromBytes(odPort[:2]),
Network: Network_TCP,
}, nil
}

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@ -0,0 +1,8 @@
//go:build !darwin
package net
// OriginalDst uses ioctl to read original destination from /dev/pf
func OriginalDst(conn Conn) (Destination, error) {
return Destination{}, newError("This platform is not supported")
}

View File

@ -558,6 +558,8 @@ func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
tproxy = internet.SocketConfig_TProxy
case "redirect":
tproxy = internet.SocketConfig_Redirect
case "pf":
tproxy = internet.SocketConfig_PF
default:
tproxy = internet.SocketConfig_Off
}

View File

@ -1,7 +1,7 @@
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// protoc-gen-go v1.28.1
// protoc v3.18.0
// protoc v3.21.5
// source: transport/internet/config.proto
package internet
@ -140,6 +140,8 @@ const (
SocketConfig_TProxy SocketConfig_TProxyMode = 1
// Redirect mode.
SocketConfig_Redirect SocketConfig_TProxyMode = 2
// PF mode.
SocketConfig_PF SocketConfig_TProxyMode = 3
)
// Enum value maps for SocketConfig_TProxyMode.
@ -148,11 +150,13 @@ var (
0: "Off",
1: "TProxy",
2: "Redirect",
3: "PF",
}
SocketConfig_TProxyMode_value = map[string]int32{
"Off": 0,
"TProxy": 1,
"Redirect": 2,
"PF": 3,
}
)
@ -587,7 +591,7 @@ var file_transport_internet_config_proto_rawDesc = []byte{
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@ -620,27 +624,27 @@ var file_transport_internet_config_proto_rawDesc = []byte{
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}
var (

View File

@ -74,6 +74,8 @@ message SocketConfig {
TProxy = 1;
// Redirect mode.
Redirect = 2;
// PF mode.
PF = 3;
}
// TProxy is for enabling TProxy socket option.