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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
*/
package conn
import (
"encoding/binary"
"unsafe"
"golang.org/x/sys/windows"
)
const (
sockoptIP_UNICAST_IF = 31
sockoptIPV6_UNICAST_IF = 31
)
func (bind *StdNetBind) BindSocketToInterface4(interfaceIndex uint32, blackhole bool) error {
/* MSDN says for IPv4 this needs to be in net byte order, so that it's like an IP address with leading zeros. */
bytes := make([]byte, 4)
binary.BigEndian.PutUint32(bytes, interfaceIndex)
interfaceIndex = *(*uint32)(unsafe.Pointer(&bytes[0]))
sysconn, err := bind.ipv4.SyscallConn()
if err != nil {
return err
}
err2 := sysconn.Control(func(fd uintptr) {
err = windows.SetsockoptInt(windows.Handle(fd), windows.IPPROTO_IP, sockoptIP_UNICAST_IF, int(interfaceIndex))
})
if err2 != nil {
return err2
}
if err != nil {
return err
}
bind.blackhole4 = blackhole
return nil
}
func (bind *StdNetBind) BindSocketToInterface6(interfaceIndex uint32, blackhole bool) error {
sysconn, err := bind.ipv6.SyscallConn()
if err != nil {
return err
}
err2 := sysconn.Control(func(fd uintptr) {
err = windows.SetsockoptInt(windows.Handle(fd), windows.IPPROTO_IPV6, sockoptIPV6_UNICAST_IF, int(interfaceIndex))
})
if err2 != nil {
return err2
}
if err != nil {
return err
}
bind.blackhole6 = blackhole
return nil
}
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