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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,219 @@ | ||
| package trace | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "log" | ||
| "net" | ||
| "os" | ||
| "strconv" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "golang.org/x/net/context" | ||
| "golang.org/x/net/icmp" | ||
| "golang.org/x/net/ipv6" | ||
| "golang.org/x/sync/semaphore" | ||
| ) | ||
|
|
||
| type ICMPTracerv6 struct { | ||
| Config | ||
| wg sync.WaitGroup | ||
| res Result | ||
| ctx context.Context | ||
| inflightRequest map[int]chan Hop | ||
| inflightRequestLock sync.Mutex | ||
| icmpListen net.PacketConn | ||
| workFork workFork | ||
| final int | ||
| finalLock sync.Mutex | ||
|
|
||
| sem *semaphore.Weighted | ||
| } | ||
|
|
||
| func (t *ICMPTracerv6) Execute() (*Result, error) { | ||
| if len(t.res.Hops) > 0 { | ||
| return &t.res, ErrTracerouteExecuted | ||
| } | ||
|
|
||
| var err error | ||
|
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||
| t.icmpListen, err = net.ListenPacket("ip6:58", "::") | ||
| if err != nil { | ||
| return &t.res, err | ||
| } | ||
| defer t.icmpListen.Close() | ||
|
|
||
| var cancel context.CancelFunc | ||
| t.ctx, cancel = context.WithCancel(context.Background()) | ||
| defer cancel() | ||
| t.inflightRequest = make(map[int]chan Hop) | ||
| t.final = -1 | ||
|
|
||
| go t.listenICMP() | ||
|
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||
| t.sem = semaphore.NewWeighted(int64(t.ParallelRequests)) | ||
|
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||
| for t.workFork.ttl = 1; t.workFork.ttl <= t.MaxHops; t.workFork.ttl++ { | ||
| for i := 0; i < t.NumMeasurements; i++ { | ||
| t.wg.Add(1) | ||
| go t.send(workFork{t.workFork.ttl, i}) | ||
| } | ||
| // 一组TTL全部退出（收到应答或者超时终止）以后，再进行下一个TTL的包发送 | ||
| t.wg.Wait() | ||
| t.workFork.num = 0 | ||
| } | ||
| t.res.reduce(t.final) | ||
|
|
||
| return &t.res, nil | ||
| } | ||
|
|
||
| func (t *ICMPTracerv6) listenICMP() { | ||
| lc := NewPacketListener(t.icmpListen, t.ctx) | ||
| go lc.Start() | ||
| for { | ||
| select { | ||
| case <-t.ctx.Done(): | ||
| return | ||
| case msg := <-lc.Messages: | ||
| if msg.N == nil { | ||
| continue | ||
| } | ||
| rm, err := icmp.ParseMessage(58, msg.Msg[:*msg.N]) | ||
| if err != nil { | ||
| log.Println(err) | ||
| continue | ||
| } | ||
| // log.Println(msg.Peer) | ||
| switch rm.Type { | ||
| case ipv6.ICMPTypeTimeExceeded: | ||
| t.handleICMPMessage(msg, 0, rm.Body.(*icmp.TimeExceeded).Data) | ||
| case ipv6.ICMPTypeEchoReply: | ||
| t.handleICMPMessage(msg, 1, rm.Body.(*icmp.Echo).Data) | ||
| default: | ||
| // log.Println("received icmp message of unknown type", rm.Type) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| } | ||
|
|
||
| func (t *ICMPTracerv6) handleICMPMessage(msg ReceivedMessage, icmpType int8, data []byte) { | ||
|
|
||
| t.inflightRequestLock.Lock() | ||
| defer t.inflightRequestLock.Unlock() | ||
| ch, ok := t.inflightRequest[t.workFork.num] | ||
| t.workFork.num += 1 | ||
| if !ok { | ||
| return | ||
| } | ||
| ch <- Hop{ | ||
| Success: true, | ||
| Address: msg.Peer, | ||
| } | ||
| } | ||
|
|
||
| func (t *ICMPTracerv6) send(fork workFork) error { | ||
| err := t.sem.Acquire(context.Background(), 1) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| defer t.sem.Release(1) | ||
|
|
||
| defer t.wg.Done() | ||
| if t.final != -1 && fork.ttl > t.final { | ||
| return nil | ||
| } | ||
|
|
||
| icmpHeader := icmp.Message{ | ||
| Type: ipv6.ICMPTypeEchoRequest, Code: 0, | ||
| Body: &icmp.Echo{ | ||
| ID: os.Getpid() & 0xffff, | ||
| Data: []byte("HELLO-R-U-THERE"), | ||
| }, | ||
| } | ||
|
|
||
| p := ipv6.NewPacketConn(t.icmpListen) | ||
|
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||
| icmpHeader.Body.(*icmp.Echo).Seq = fork.ttl | ||
| p.SetHopLimit(fork.ttl) | ||
|
|
||
| wb, err := icmpHeader.Marshal(nil) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
|
|
||
| start := time.Now() | ||
| if _, err := t.icmpListen.WriteTo(wb, &net.IPAddr{IP: t.DestIP}); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| if err := t.icmpListen.SetReadDeadline(time.Now().Add(3 * time.Second)); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| t.inflightRequestLock.Lock() | ||
| hopCh := make(chan Hop) | ||
| t.inflightRequest[fork.num] = hopCh | ||
| t.inflightRequestLock.Unlock() | ||
|
|
||
| defer func() { | ||
| t.inflightRequestLock.Lock() | ||
| close(hopCh) | ||
| delete(t.inflightRequest, fork.ttl) | ||
| t.inflightRequestLock.Unlock() | ||
| }() | ||
|
|
||
| if fork.num == 0 && t.Config.RoutePath { | ||
| fmt.Print(strconv.Itoa(fork.ttl)) | ||
| } | ||
|
|
||
| select { | ||
| case <-t.ctx.Done(): | ||
| return nil | ||
| case h := <-hopCh: | ||
| rtt := time.Since(start) | ||
| if t.final != -1 && fork.ttl > t.final { | ||
| return nil | ||
| } | ||
| if addr, ok := h.Address.(*net.IPAddr); ok && addr.IP.Equal(t.DestIP) { | ||
| t.finalLock.Lock() | ||
| if t.final == -1 || fork.ttl < t.final { | ||
| t.final = fork.ttl | ||
| } | ||
| t.finalLock.Unlock() | ||
| } else if addr, ok := h.Address.(*net.TCPAddr); ok && addr.IP.Equal(t.DestIP) { | ||
| t.finalLock.Lock() | ||
| if t.final == -1 || fork.ttl < t.final { | ||
| t.final = fork.ttl | ||
| } | ||
| t.finalLock.Unlock() | ||
| } | ||
|
|
||
| h.TTL = fork.ttl | ||
| h.RTT = rtt | ||
|
|
||
| h.fetchIPData(t.Config) | ||
| if t.Config.RoutePath { | ||
| HopPrinter(h) | ||
| } | ||
|
|
||
| t.res.add(h) | ||
|
|
||
| case <-time.After(t.Timeout): | ||
| if t.final != -1 && fork.ttl > t.final { | ||
| return nil | ||
| } | ||
|
|
||
| t.res.add(Hop{ | ||
| Success: false, | ||
| Address: nil, | ||
| TTL: fork.ttl, | ||
| RTT: 0, | ||
| Error: ErrHopLimitTimeout, | ||
| }) | ||
| if t.Config.RoutePath { | ||
| fmt.Println("\t" + "*") | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } |
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