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43 lines
967 B
43 lines
967 B
// 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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"unsafe"
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"golang.org/x/net/internal/socket"
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)
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func (so *sockOpt) getIPMreqn(c *socket.Conn) (*net.Interface, error) {
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b := make([]byte, so.Len)
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if _, err := so.Get(c, b); err != nil {
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return nil, err
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}
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mreqn := (*ipMreqn)(unsafe.Pointer(&b[0]))
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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 (so *sockOpt) setIPMreqn(c *socket.Conn, ifi *net.Interface, grp net.IP) error {
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var mreqn ipMreqn
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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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b := (*[sizeofIPMreqn]byte)(unsafe.Pointer(&mreqn))[:sizeofIPMreqn]
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return so.Set(c, b)
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}
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