mirror of
https://github.com/golang/go
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c5f5df4d98
This CL allows to receive network interface arrival and depature notifications through routing sockets on BSD variants. So far Darwin doesn't support this feature. Also does small simplification. Update #4866. R=golang-dev, lucio.dere, dave CC=golang-dev https://golang.org/cl/7365055
73 lines
2.2 KiB
Go
73 lines
2.2 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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// Routing sockets and messages for FreeBSD
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package syscall
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import "unsafe"
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func (any *anyMessage) toRoutingMessage(b []byte) RoutingMessage {
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switch any.Type {
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case RTM_ADD, RTM_DELETE, RTM_CHANGE, RTM_GET, RTM_LOSING, RTM_REDIRECT, RTM_MISS, RTM_LOCK, RTM_RESOLVE:
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p := (*RouteMessage)(unsafe.Pointer(any))
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return &RouteMessage{Header: p.Header, Data: b[SizeofRtMsghdr:any.Msglen]}
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case RTM_IFINFO:
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p := (*InterfaceMessage)(unsafe.Pointer(any))
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return &InterfaceMessage{Header: p.Header, Data: b[SizeofIfMsghdr:any.Msglen]}
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case RTM_IFANNOUNCE:
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p := (*InterfaceAnnounceMessage)(unsafe.Pointer(any))
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return &InterfaceAnnounceMessage{Header: p.Header}
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case RTM_NEWADDR, RTM_DELADDR:
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p := (*InterfaceAddrMessage)(unsafe.Pointer(any))
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return &InterfaceAddrMessage{Header: p.Header, Data: b[SizeofIfaMsghdr:any.Msglen]}
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case RTM_NEWMADDR, RTM_DELMADDR:
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p := (*InterfaceMulticastAddrMessage)(unsafe.Pointer(any))
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return &InterfaceMulticastAddrMessage{Header: p.Header, Data: b[SizeofIfmaMsghdr:any.Msglen]}
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}
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return nil
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}
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// InterfaceAnnounceMessage represents a routing message containing
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// network interface arrival and depature information.
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type InterfaceAnnounceMessage struct {
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Header IfAnnounceMsghdr
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}
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func (m *InterfaceAnnounceMessage) sockaddr() (sas []Sockaddr) { return nil }
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// InterfaceMulticastAddrMessage represents a routing message
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// containing network interface address entries.
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type InterfaceMulticastAddrMessage struct {
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Header IfmaMsghdr
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Data []byte
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}
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const rtaIfmaMask = RTA_GATEWAY | RTA_IFP | RTA_IFA
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func (m *InterfaceMulticastAddrMessage) sockaddr() (sas []Sockaddr) {
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if m.Header.Addrs&rtaIfmaMask == 0 {
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return nil
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}
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b := m.Data[:]
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for i := uint(0); i < RTAX_MAX; i++ {
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if m.Header.Addrs&rtaIfmaMask&(1<<i) == 0 {
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continue
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}
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rsa := (*RawSockaddr)(unsafe.Pointer(&b[0]))
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switch i {
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case RTAX_IFA:
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sa, e := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
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if e != nil {
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return nil
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}
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sas = append(sas, sa)
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case RTAX_GATEWAY, RTAX_IFP:
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// nothing to do
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}
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b = b[rsaAlignOf(int(rsa.Len)):]
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}
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return sas
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}
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