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Feature: bind socket to interface by native API on Windows (#2662)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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 | ||
|
|
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| 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 | ||
| } | ||
| } | ||
|
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| 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 | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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 | ||
| } | ||
|
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| 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) | ||
| } | ||
| } | ||
|
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| addr, err := lookupLocalAddr(ifaceName, network, destination, int(local)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| dialer.LocalAddr = addr | ||
|
|
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| return nil | ||
| } | ||
|
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| func fallbackBindIfaceToListenConfig(ifaceName string, _ *net.ListenConfig, network, address string) (string, error) { | ||
| _, port, err := net.SplitHostPort(address) | ||
| if err != nil { | ||
| port = "0" | ||
| } | ||
|
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| local, _ := strconv.ParseUint(port, 10, 16) | ||
|
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| addr, err := lookupLocalAddr(ifaceName, network, nil, int(local)) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| return addr.String(), nil | ||
| } |
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