60 lines
1.4 KiB
Go
60 lines
1.4 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2017-2020 WireGuard LLC. All Rights Reserved.
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*/
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package conn
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import (
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"encoding/binary"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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const (
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sockoptIP_UNICAST_IF = 31
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sockoptIPV6_UNICAST_IF = 31
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)
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func (bind *nativeBind) BindSocketToInterface4(interfaceIndex uint32, blackhole bool) error {
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/* MSDN says for IPv4 this needs to be in net byte order, so that it's like an IP address with leading zeros. */
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bytes := make([]byte, 4)
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binary.BigEndian.PutUint32(bytes, interfaceIndex)
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interfaceIndex = *(*uint32)(unsafe.Pointer(&bytes[0]))
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sysconn, err := bind.ipv4.SyscallConn()
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if err != nil {
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return err
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}
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err2 := sysconn.Control(func(fd uintptr) {
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err = windows.SetsockoptInt(windows.Handle(fd), windows.IPPROTO_IP, sockoptIP_UNICAST_IF, int(interfaceIndex))
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})
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if err2 != nil {
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return err2
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}
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if err != nil {
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return err
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}
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bind.blackhole4 = blackhole
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return nil
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}
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func (bind *nativeBind) BindSocketToInterface6(interfaceIndex uint32, blackhole bool) error {
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sysconn, err := bind.ipv6.SyscallConn()
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if err != nil {
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return err
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}
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err2 := sysconn.Control(func(fd uintptr) {
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err = windows.SetsockoptInt(windows.Handle(fd), windows.IPPROTO_IPV6, sockoptIPV6_UNICAST_IF, int(interfaceIndex))
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})
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if err2 != nil {
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return err2
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}
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if err != nil {
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return err
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}
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bind.blackhole6 = blackhole
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return nil
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}
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