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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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