43 lines
1 KiB
Go
43 lines
1 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build darwin freebsd linux
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package ipv4
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import (
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"net"
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"os"
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"unsafe"
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"golang.org/x/net/internal/iana"
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)
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func getsockoptIPMreqn(fd, name int) (*net.Interface, error) {
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var mreqn sysIPMreqn
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l := uint32(sysSizeofIPMreqn)
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if err := getsockopt(fd, iana.ProtocolIP, name, unsafe.Pointer(&mreqn), &l); err != nil {
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return nil, os.NewSyscallError("getsockopt", err)
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}
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if mreqn.Ifindex == 0 {
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return nil, nil
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}
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ifi, err := net.InterfaceByIndex(int(mreqn.Ifindex))
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if err != nil {
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return nil, err
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}
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return ifi, nil
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}
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func setsockoptIPMreqn(fd, name int, ifi *net.Interface, grp net.IP) error {
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var mreqn sysIPMreqn
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if ifi != nil {
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mreqn.Ifindex = int32(ifi.Index)
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}
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if grp != nil {
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mreqn.Multiaddr = [4]byte{grp[0], grp[1], grp[2], grp[3]}
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}
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return os.NewSyscallError("setsockopt", setsockopt(fd, iana.ProtocolIP, name, unsafe.Pointer(&mreqn), sysSizeofIPMreqn))
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}
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