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https://github.com/golang/go
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519474451a
This is a subset of https://golang.org/cl/20022 with only the copyright header lines, so the next CL will be smaller and more reviewable. Go policy has been single space after periods in comments for some time. The copyright header template at: https://golang.org/doc/contribute.html#copyright also uses a single space. Make them all consistent. Change-Id: Icc26c6b8495c3820da6b171ca96a74701b4a01b0 Reviewed-on: https://go-review.googlesource.com/20111 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
63 lines
1.7 KiB
Go
63 lines
1.7 KiB
Go
// Copyright 2011 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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package net
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import (
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"os"
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"syscall"
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)
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// interfaceMulticastAddrTable returns addresses for a specific
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// interface.
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func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) {
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tab, err := syscall.RouteRIB(syscall.NET_RT_IFLIST2, ifi.Index)
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if err != nil {
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return nil, os.NewSyscallError("routerib", err)
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}
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msgs, err := syscall.ParseRoutingMessage(tab)
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if err != nil {
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return nil, os.NewSyscallError("parseroutingmessage", err)
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}
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var ifmat []Addr
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for _, m := range msgs {
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switch m := m.(type) {
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case *syscall.InterfaceMulticastAddrMessage:
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if ifi.Index == int(m.Header.Index) {
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ifma, err := newMulticastAddr(ifi, m)
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if err != nil {
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return nil, err
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}
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if ifma != nil {
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ifmat = append(ifmat, ifma)
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}
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}
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}
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}
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return ifmat, nil
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}
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func newMulticastAddr(ifi *Interface, m *syscall.InterfaceMulticastAddrMessage) (*IPAddr, error) {
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sas, err := syscall.ParseRoutingSockaddr(m)
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if err != nil {
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return nil, os.NewSyscallError("parseroutingsockaddr", err)
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}
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switch sa := sas[syscall.RTAX_IFA].(type) {
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case *syscall.SockaddrInet4:
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return &IPAddr{IP: IPv4(sa.Addr[0], sa.Addr[1], sa.Addr[2], sa.Addr[3])}, nil
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case *syscall.SockaddrInet6:
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ifma := IPAddr{IP: make(IP, IPv6len)}
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copy(ifma.IP, sa.Addr[:])
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// NOTE: KAME based IPv6 protocol stack usually embeds
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// the interface index in the interface-local or
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// link-local address as the kernel-internal form.
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if ifma.IP.IsInterfaceLocalMulticast() || ifma.IP.IsLinkLocalMulticast() {
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ifma.IP[2], ifma.IP[3] = 0, 0
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}
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return &ifma, nil
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default:
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return nil, nil
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}
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}
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