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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"
"os"
"unsafe"
"golang.org/x/net/internal/iana"
)
func getsockoptIPMreqn(s uintptr, name int) (*net.Interface, error) {
var mreqn ipMreqn
l := uint32(sizeofIPMreqn)
if err := getsockopt(s, iana.ProtocolIP, name, unsafe.Pointer(&mreqn), &l); err != nil {
return nil, os.NewSyscallError("getsockopt", err)
}
if mreqn.Ifindex == 0 {
return nil, nil
}
ifi, err := net.InterfaceByIndex(int(mreqn.Ifindex))
if err != nil {
return nil, err
}
return ifi, nil
}
func setsockoptIPMreqn(s uintptr, name int, 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]}
}
return os.NewSyscallError("setsockopt", setsockopt(s, iana.ProtocolIP, name, unsafe.Pointer(&mreqn), sizeofIPMreqn))
}
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