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Feature: bind socket to interface by native API on Windows (#2662)

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This commit is contained in:
yaling888 2023-04-08 19:20:14 +08:00 committed by GitHub
parent 95bbfe3945
commit 20a521f02d
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 224 additions and 50 deletions
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12
component/dhcp/conn.go
View File

@ -14,5 +14,15 @@ func ListenDHCPClient(ctx context.Context, ifaceName string) (net.PacketConn, er
listenAddr = "255.255.255.255:68"
}
return dialer.ListenPacket(ctx, "udp4", listenAddr, dialer.WithInterface(ifaceName), dialer.WithAddrReuse(true))
options := []dialer.Option{
dialer.WithInterface(ifaceName),
dialer.WithAddrReuse(true),
}
// fallback bind on windows, because syscall bind can not receive broadcast
if runtime.GOOS == "windows" {
options = append(options, dialer.WithFallbackBind(true))
}
return dialer.ListenPacket(ctx, "udp4", listenAddr, options...)
}

47
component/dialer/bind_others.go
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@ -1,57 +1,12 @@
//go:build !linux && !darwin
//go:build !linux && !darwin && !windows
package dialer
import (
"net"
"strconv"
"strings"
"github.com/Dreamacro/clash/component/iface"
)
func lookupLocalAddr(ifaceName string, network string, destination net.IP, port int) (net.Addr, error) {
ifaceObj, err := iface.ResolveInterface(ifaceName)
if err != nil {
return nil, err
}
var addr *net.IPNet
switch network {
case "udp4", "tcp4":
addr, err = ifaceObj.PickIPv4Addr(destination)
case "tcp6", "udp6":
addr, err = ifaceObj.PickIPv6Addr(destination)
default:
if destination != nil {
if destination.To4() != nil {
addr, err = ifaceObj.PickIPv4Addr(destination)
} else {
addr, err = ifaceObj.PickIPv6Addr(destination)
}
} else {
addr, err = ifaceObj.PickIPv4Addr(destination)
}
}
if err != nil {
return nil, err
}
if strings.HasPrefix(network, "tcp") {
return &net.TCPAddr{
IP: addr.IP,
Port: port,
}, nil
} else if strings.HasPrefix(network, "udp") {
return &net.UDPAddr{
IP: addr.IP,
Port: port,
}, nil
}
return nil, iface.ErrAddrNotFound
}
func bindIfaceToDialer(ifaceName string, dialer *net.Dialer, network string, destination net.IP) error {
if !destination.IsGlobalUnicast() {
return nil

98
component/dialer/bind_windows.go Normal file
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@ -0,0 +1,98 @@
package dialer
import (
"encoding/binary"
"net"
"strings"
"syscall"
"unsafe"
"github.com/Dreamacro/clash/component/iface"
"golang.org/x/sys/windows"
)
const (
IP_UNICAST_IF = 31
IPV6_UNICAST_IF = 31
)
type controlFn = func(network, address string, c syscall.RawConn) error
func bindControl(ifaceIdx int, chain controlFn) controlFn {
return func(network, address string, c syscall.RawConn) (err error) {
defer func() {
if err == nil && chain != nil {
err = chain(network, address, c)
}
}()
ipStr, _, err := net.SplitHostPort(address)
if err == nil {
ip := net.ParseIP(ipStr)
if ip != nil && !ip.IsGlobalUnicast() {
return
}
}
var innerErr error
err = c.Control(func(fd uintptr) {
if ipStr == "" && strings.HasPrefix(network, "udp") {
// When listening udp ":0", we should bind socket to interface4 and interface6 at the same time
// and ignore the error of bind6
_ = bindSocketToInterface6(windows.Handle(fd), ifaceIdx)
innerErr = bindSocketToInterface4(windows.Handle(fd), ifaceIdx)
return
}
switch network {
case "tcp4", "udp4":
innerErr = bindSocketToInterface4(windows.Handle(fd), ifaceIdx)
case "tcp6", "udp6":
innerErr = bindSocketToInterface6(windows.Handle(fd), ifaceIdx)
}
})
if innerErr != nil {
err = innerErr
}
return
}
}
func bindSocketToInterface4(handle windows.Handle, ifaceIdx int) error {
// MSDN says for IPv4 this needs to be in net byte order, so that it's like an IP address with leading zeros.
// Ref: https://learn.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
var bytes [4]byte
binary.BigEndian.PutUint32(bytes[:], uint32(ifaceIdx))
index := *(*uint32)(unsafe.Pointer(&bytes[0]))
err := windows.SetsockoptInt(handle, windows.IPPROTO_IP, IP_UNICAST_IF, int(index))
if err != nil {
return err
}
return nil
}
func bindSocketToInterface6(handle windows.Handle, ifaceIdx int) error {
return windows.SetsockoptInt(handle, windows.IPPROTO_IPV6, IPV6_UNICAST_IF, ifaceIdx)
}
func bindIfaceToDialer(ifaceName string, dialer *net.Dialer, _ string, _ net.IP) error {
ifaceObj, err := iface.ResolveInterface(ifaceName)
if err != nil {
return err
}
dialer.Control = bindControl(ifaceObj.Index, dialer.Control)
return nil
}
func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, _, address string) (string, error) {
ifaceObj, err := iface.ResolveInterface(ifaceName)
if err != nil {
return "", err
}
lc.Control = bindControl(ifaceObj.Index, lc.Control)
return address, nil
}

16
component/dialer/dialer.go
View File

@ -51,7 +51,15 @@ func ListenPacket(ctx context.Context, network, address string, options ...Optio
lc := &net.ListenConfig{}
if cfg.interfaceName != "" {
addr, err := bindIfaceToListenConfig(cfg.interfaceName, lc, network, address)
var (
addr string
err error
)
if cfg.fallbackBind {
addr, err = fallbackBindIfaceToListenConfig(cfg.interfaceName, lc, network, address)
} else {
addr, err = bindIfaceToListenConfig(cfg.interfaceName, lc, network, address)
}
if err != nil {
return nil, err
}
@ -83,10 +91,16 @@ func dialContext(ctx context.Context, network string, destination net.IP, port s
dialer := &net.Dialer{}
if opt.interfaceName != "" {
if opt.fallbackBind {
if err := fallbackBindIfaceToDialer(opt.interfaceName, dialer, network, destination); err != nil {
return nil, err
}
} else {
if err := bindIfaceToDialer(opt.interfaceName, dialer, network, destination); err != nil {
return nil, err
}
}
}
if opt.routingMark != 0 {
bindMarkToDialer(opt.routingMark, dialer, network, destination)
}

90
component/dialer/fallbackbind.go Normal file
View File

@ -0,0 +1,90 @@
package dialer
import (
"net"
"strconv"
"strings"
"github.com/Dreamacro/clash/component/iface"
)
func lookupLocalAddr(ifaceName string, network string, destination net.IP, port int) (net.Addr, error) {
ifaceObj, err := iface.ResolveInterface(ifaceName)
if err != nil {
return nil, err
}
var addr *net.IPNet
switch network {
case "udp4", "tcp4":
addr, err = ifaceObj.PickIPv4Addr(destination)
case "tcp6", "udp6":
addr, err = ifaceObj.PickIPv6Addr(destination)
default:
if destination != nil {
if destination.To4() != nil {
addr, err = ifaceObj.PickIPv4Addr(destination)
} else {
addr, err = ifaceObj.PickIPv6Addr(destination)
}
} else {
addr, err = ifaceObj.PickIPv4Addr(destination)
}
}
if err != nil {
return nil, err
}
if strings.HasPrefix(network, "tcp") {
return &net.TCPAddr{
IP: addr.IP,
Port: port,
}, nil
} else if strings.HasPrefix(network, "udp") {
return &net.UDPAddr{
IP: addr.IP,
Port: port,
}, nil
}
return nil, iface.ErrAddrNotFound
}
func fallbackBindIfaceToDialer(ifaceName string, dialer *net.Dialer, network string, destination net.IP) error {
if !destination.IsGlobalUnicast() {
return nil
}
local := uint64(0)
if dialer.LocalAddr != nil {
_, port, err := net.SplitHostPort(dialer.LocalAddr.String())
if err == nil {
local, _ = strconv.ParseUint(port, 10, 16)
}
}
addr, err := lookupLocalAddr(ifaceName, network, destination, int(local))
if err != nil {
return err
}
dialer.LocalAddr = addr
return nil
}
func fallbackBindIfaceToListenConfig(ifaceName string, _ *net.ListenConfig, network, address string) (string, error) {
_, port, err := net.SplitHostPort(address)
if err != nil {
port = "0"
}
local, _ := strconv.ParseUint(port, 10, 16)
addr, err := lookupLocalAddr(ifaceName, network, nil, int(local))
if err != nil {
return "", err
}
return addr.String(), nil
}

7
component/dialer/options.go
View File

@ -10,6 +10,7 @@ var (
type option struct {
interfaceName string
fallbackBind bool
addrReuse bool
routingMark int
}
@ -22,6 +23,12 @@ func WithInterface(name string) Option {
}
}
func WithFallbackBind(fallback bool) Option {
return func(opt *option) {
opt.fallbackBind = fallback
}
}
func WithAddrReuse(reuse bool) Option {
return func(opt *option) {
opt.addrReuse = reuse