package dialer import ( "context" "net" "net/netip" "syscall" "golang.org/x/sys/unix" ) func bindControl(ifaceName string) 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) { innerErr = unix.BindToDevice(int(fd), ifaceName) }) if innerErr != nil { err = innerErr } return } } func bindIfaceToDialer(ifaceName string, dialer *net.Dialer, _ string, _ netip.Addr) error { addControlToDialer(dialer, bindControl(ifaceName)) return nil } func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, _, address string, rAddrPort netip.AddrPort) (string, error) { addControlToListenConfig(lc, bindControl(ifaceName)) return address, nil } func ParseNetwork(network string, addr netip.Addr) string { return network }