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| // Copyright 2014 The Go Authors. All rights reserved.
| // Use of this source code is governed by a BSD-style
| // license that can be found in the LICENSE file.
|
| // +build darwin freebsd linux
|
| package ipv4
|
| import (
| "net"
| "unsafe"
|
| "golang.org/x/net/internal/socket"
| )
|
| func (so *sockOpt) getIPMreqn(c *socket.Conn) (*net.Interface, error) {
| b := make([]byte, so.Len)
| if _, err := so.Get(c, b); err != nil {
| return nil, err
| }
| mreqn := (*ipMreqn)(unsafe.Pointer(&b[0]))
| if mreqn.Ifindex == 0 {
| return nil, nil
| }
| ifi, err := net.InterfaceByIndex(int(mreqn.Ifindex))
| if err != nil {
| return nil, err
| }
| return ifi, nil
| }
|
| func (so *sockOpt) setIPMreqn(c *socket.Conn, ifi *net.Interface, grp net.IP) error {
| var mreqn ipMreqn
| if ifi != nil {
| mreqn.Ifindex = int32(ifi.Index)
| }
| if grp != nil {
| mreqn.Multiaddr = [4]byte{grp[0], grp[1], grp[2], grp[3]}
| }
| b := (*[sizeofIPMreqn]byte)(unsafe.Pointer(&mreqn))[:sizeofIPMreqn]
| return so.Set(c, b)
| }
|
|
