101 lines
2.4 KiB
Go
101 lines
2.4 KiB
Go
package dialer
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import (
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"context"
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"encoding/binary"
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"fmt"
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"net"
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"net/netip"
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"syscall"
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"unsafe"
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"github.com/Dreamacro/clash/component/iface"
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)
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const (
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IP_UNICAST_IF = 31
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IPV6_UNICAST_IF = 31
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)
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func bind4(handle syscall.Handle, ifaceIdx int) error {
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var bytes [4]byte
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binary.BigEndian.PutUint32(bytes[:], uint32(ifaceIdx))
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idx := *(*uint32)(unsafe.Pointer(&bytes[0]))
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err := syscall.SetsockoptInt(handle, syscall.IPPROTO_IP, IP_UNICAST_IF, int(idx))
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if err != nil {
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err = fmt.Errorf("bind4: %w", err)
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}
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return err
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}
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func bind6(handle syscall.Handle, ifaceIdx int) error {
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err := syscall.SetsockoptInt(handle, syscall.IPPROTO_IPV6, IPV6_UNICAST_IF, ifaceIdx)
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if err != nil {
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err = fmt.Errorf("bind6: %w", err)
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}
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return err
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}
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func bindControl(ifaceIdx int) controlFn {
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return func(ctx context.Context, network, address string, c syscall.RawConn) (err error) {
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addrPort, err := netip.ParseAddrPort(address)
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if err == nil && !addrPort.Addr().IsGlobalUnicast() {
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return
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}
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var innerErr error
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err = c.Control(func(fd uintptr) {
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handle := syscall.Handle(fd)
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bind6err := bind6(handle, ifaceIdx)
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bind4err := bind4(handle, ifaceIdx)
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switch network {
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case "ip6", "tcp6":
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innerErr = bind6err
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case "ip4", "tcp4", "udp4":
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innerErr = bind4err
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case "udp6":
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// golang will set network to udp6 when listenUDP on wildcard ip (eg: ":0", "")
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if (!addrPort.Addr().IsValid() || addrPort.Addr().IsUnspecified()) && bind6err != nil {
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// try bind ipv6, if failed, ignore. it's a workaround for windows disable interface ipv6
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if bind4err != nil {
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innerErr = fmt.Errorf("%w (%s)", bind6err, bind4err)
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} else {
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innerErr = nil
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}
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} else {
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innerErr = bind6err
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}
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}
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})
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if innerErr != nil {
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err = innerErr
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}
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return
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}
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}
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func bindIfaceToDialer(ifaceName string, dialer *net.Dialer, _ string, _ netip.Addr) error {
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ifaceObj, err := iface.ResolveInterface(ifaceName)
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if err != nil {
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return err
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}
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addControlToDialer(dialer, bindControl(ifaceObj.Index))
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return nil
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}
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func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, _, address string) (string, error) {
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ifaceObj, err := iface.ResolveInterface(ifaceName)
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if err != nil {
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return "", err
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}
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addControlToListenConfig(lc, bindControl(ifaceObj.Index))
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return address, nil
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}
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func ParseNetwork(network string, addr netip.Addr) string {
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return network
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}
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