| // 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. |
| |
| //go:build darwin || freebsd || linux |
| // +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) |
| } |