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1 // Copyright 2012 The Go Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style | |
3 // license that can be found in the LICENSE file. | |
4 | |
5 // +build darwin freebsd linux netbsd openbsd windows | |
6 | |
7 package ipv4 | |
8 | |
9 import ( | |
10 "bytes" | |
11 "net" | |
12 "syscall" | |
13 ) | |
14 | |
15 func setSyscallIPMreq(mreq *syscall.IPMreq, ifi *net.Interface) error { | |
16 if ifi == nil { | |
17 return nil | |
18 } | |
19 ifat, err := ifi.Addrs() | |
20 if err != nil { | |
21 return err | |
22 } | |
23 for _, ifa := range ifat { | |
24 switch v := ifa.(type) { | |
25 case *net.IPAddr: | |
26 if a := v.IP.To4(); a != nil { | |
27 copy(mreq.Interface[:], a) | |
28 goto done | |
29 } | |
30 case *net.IPNet: | |
31 if a := v.IP.To4(); a != nil { | |
32 copy(mreq.Interface[:], a) | |
33 goto done | |
34 } | |
35 } | |
36 } | |
37 done: | |
38 if bytes.Equal(mreq.Multiaddr[:], net.IPv4zero.To4()) { | |
39 return errNoSuchMulticastInterface | |
40 } | |
41 return nil | |
42 } | |
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