package dialer import ( "context" "net" "net/netip" "syscall" "github.com/Dreamacro/clash/component/iface" "golang.org/x/sys/unix" ) func bindControl(ifaceIdx int) controlFn { return func(ctx context.Context, network, address string, c syscall.RawConn) (err error) { addrPort, err := netip.ParseAddrPort(address) if err == nil && !addrPort.Addr().IsGlobalUnicast() { return } var innerErr error err = c.Control(func(fd uintptr) { switch network { case "tcp4", "udp4": innerErr = unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_BOUND_IF, ifaceIdx) case "tcp6", "udp6": innerErr = unix.SetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_BOUND_IF, ifaceIdx) } }) if innerErr != nil { err = innerErr } return } } func bindIfaceToDialer(ifaceName string, dialer *net.Dialer, _ string, _ netip.Addr) error { ifaceObj, err := iface.ResolveInterface(ifaceName) if err != nil { return err } addControlToDialer(dialer, bindControl(ifaceObj.Index)) return nil } func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, _, address string) (string, error) { ifaceObj, err := iface.ResolveInterface(ifaceName) if err != nil { return "", err } addControlToListenConfig(lc, bindControl(ifaceObj.Index)) return address, nil } func ParseNetwork(network string, addr netip.Addr) string { return network }