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42 lines
967 B
42 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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