733 lines
20 KiB
Go
733 lines
20 KiB
Go
/*
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Copyright 2024 Josh Deprez
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package router
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import (
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"bytes"
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"context"
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"log"
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"net"
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"sync"
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"time"
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"gitea.drjosh.dev/josh/jrouter/aurp"
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"github.com/sfiera/multitalk/pkg/ddp"
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)
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const (
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// TODO: check these parameters
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lastHeardFromTimer = 90 * time.Second
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tickleRetryLimit = 10
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sendRetryTimer = 10 * time.Second
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sendRetryLimit = 5
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reconnectTimer = 10 * time.Minute
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updateTimer = 10 * time.Second
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)
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type ReceiverState int
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const (
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ReceiverUnconnected ReceiverState = iota
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ReceiverConnected
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ReceiverWaitForOpenRsp
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ReceiverWaitForRIRsp
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ReceiverWaitForTickleAck
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)
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func (rs ReceiverState) String() string {
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switch rs {
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case ReceiverUnconnected:
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return "unconnected"
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case ReceiverConnected:
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return "connected"
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case ReceiverWaitForOpenRsp:
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return "waiting for Open-Rsp"
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case ReceiverWaitForRIRsp:
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return "waiting for RI-Rsp"
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case ReceiverWaitForTickleAck:
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return "waiting for Tickle-Ack"
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default:
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return "unknown"
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}
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}
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type SenderState int
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const (
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SenderUnconnected SenderState = iota
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SenderConnected
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SenderWaitForRIRspAck
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SenderWaitForRIUpdAck
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SenderWaitForRDAck
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)
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func (ss SenderState) String() string {
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switch ss {
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case SenderUnconnected:
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return "unconnected"
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case SenderConnected:
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return "connected"
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case SenderWaitForRIRspAck:
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return "waiting for RI-Ack for RI-Rsp"
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case SenderWaitForRIUpdAck:
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return "waiting for RI-Ack for RI-Upd"
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case SenderWaitForRDAck:
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return "waiting for RI-Ack for RD"
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default:
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return "unknown"
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}
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}
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// AURPPeer handles the peering with a peer AURP router.
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type AURPPeer struct {
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// AURP-Tr state for producing packets.
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Transport *aurp.Transport
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// Connection to reply to packets on.
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UDPConn *net.UDPConn
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// The string that appeared in the config file / peer list file (with a
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// ":387" appended as necessary).
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// May be empty if this peer was not configured (it connected to us).
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ConfiguredAddr string
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// The resolved address of the peer.
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RemoteAddr *net.UDPAddr
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// Incoming packet channel.
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ReceiveCh chan aurp.Packet
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// Route table (the peer will add/remove/update routes and zones)
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RouteTable *RouteTable
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// The internal states below are only set within the Handle loop, but can
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// be read concurrently from outside.
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mu sync.RWMutex
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rstate ReceiverState
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sstate SenderState
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lastReconnect time.Time
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lastHeardFrom time.Time
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lastSend time.Time // TODO: clarify use of lastSend / sendRetries
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lastUpdate time.Time
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sendRetries int
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}
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func (p *AURPPeer) Forward(ddpkt *ddp.ExtPacket) error {
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outPkt, err := ddp.ExtMarshal(*ddpkt)
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if err != nil {
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return err
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}
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_, err = p.send(p.Transport.NewAppleTalkPacket(outPkt))
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return err
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}
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func (p *AURPPeer) ReceiverState() ReceiverState {
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p.mu.RLock()
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defer p.mu.RUnlock()
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return p.rstate
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}
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func (p *AURPPeer) SenderState() SenderState {
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p.mu.RLock()
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defer p.mu.RUnlock()
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return p.sstate
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}
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func (p *AURPPeer) LastReconnectAgo() string {
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p.mu.RLock()
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defer p.mu.RUnlock()
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return ago(p.lastReconnect)
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}
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func (p *AURPPeer) LastHeardFromAgo() string {
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||
p.mu.RLock()
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defer p.mu.RUnlock()
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return ago(p.lastHeardFrom)
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}
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func (p *AURPPeer) LastSendAgo() string {
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p.mu.RLock()
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defer p.mu.RUnlock()
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return ago(p.lastSend)
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}
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func (p *AURPPeer) LastUpdateAgo() string {
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p.mu.RLock()
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defer p.mu.RUnlock()
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return ago(p.lastUpdate)
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}
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func (p *AURPPeer) SendRetries() int {
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p.mu.RLock()
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defer p.mu.RUnlock()
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return p.sendRetries
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}
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func (p *AURPPeer) setRState(rstate ReceiverState) {
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p.mu.Lock()
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defer p.mu.Unlock()
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||
p.rstate = rstate
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}
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func (p *AURPPeer) setSState(sstate SenderState) {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.sstate = sstate
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}
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func (p *AURPPeer) incSendRetries() {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.sendRetries++
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}
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func (p *AURPPeer) resetSendRetries() {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.sendRetries = 0
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||
}
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func (p *AURPPeer) bumpLastHeardFrom() {
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p.mu.Lock()
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defer p.mu.Unlock()
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||
p.lastHeardFrom = time.Now()
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}
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func (p *AURPPeer) bumpLastReconnect() {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.lastReconnect = time.Now()
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}
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func (p *AURPPeer) bumpLastSend() {
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p.mu.Lock()
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defer p.mu.Unlock()
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||
p.lastSend = time.Now()
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||
}
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func (p *AURPPeer) bumpLastUpdate() {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.lastUpdate = time.Now()
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}
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func (p *AURPPeer) disconnect() {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.rstate = ReceiverUnconnected
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p.sstate = SenderUnconnected
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}
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// send encodes and sends pkt to the remote host.
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func (p *AURPPeer) send(pkt aurp.Packet) (int, error) {
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var b bytes.Buffer
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if _, err := pkt.WriteTo(&b); err != nil {
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return 0, err
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}
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log.Printf("AURP Peer: Sending %T (len %d) to %v", pkt, b.Len(), p.RemoteAddr)
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return p.UDPConn.WriteToUDP(b.Bytes(), p.RemoteAddr)
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}
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func (p *AURPPeer) Handle(ctx context.Context) error {
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rticker := time.NewTicker(1 * time.Second)
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defer rticker.Stop()
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sticker := time.NewTicker(1 * time.Second)
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defer sticker.Stop()
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p.mu.Lock()
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p.lastReconnect = time.Now()
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p.lastHeardFrom = time.Now()
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p.lastSend = time.Now() // TODO: clarify use of lastSend / sendRetries
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p.lastUpdate = time.Now()
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p.sendRetries = 0
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p.mu.Unlock()
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var lastRISent aurp.Packet
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p.disconnect()
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// Write an Open-Req packet
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if _, err := p.send(p.Transport.NewOpenReqPacket(nil)); err != nil {
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log.Printf("AURP Peer: Couldn't send Open-Req packet: %v", err)
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return err
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}
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p.setRState(ReceiverWaitForOpenRsp)
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for {
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select {
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case <-ctx.Done():
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if p.sstate == SenderUnconnected {
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// Return immediately
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return ctx.Err()
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}
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// Send a best-effort Router Down before returning
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lastRISent = p.Transport.NewRDPacket(aurp.ErrCodeNormalClose)
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if _, err := p.send(lastRISent); err != nil {
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log.Printf("Couldn't send RD packet: %v", err)
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}
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return ctx.Err()
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case <-rticker.C:
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||
switch p.rstate {
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case ReceiverWaitForOpenRsp:
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if time.Since(p.lastSend) <= sendRetryTimer {
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break
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||
}
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if p.sendRetries >= sendRetryLimit {
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log.Printf("AURP Peer: Send retry limit reached while waiting for Open-Rsp, closing connection")
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p.setRState(ReceiverUnconnected)
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break
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||
}
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// Send another Open-Req
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p.incSendRetries()
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p.bumpLastSend()
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if _, err := p.send(p.Transport.NewOpenReqPacket(nil)); err != nil {
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||
log.Printf("AURP Peer: Couldn't send Open-Req packet: %v", err)
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||
return err
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||
}
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case ReceiverConnected:
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||
// Check LHFT, send tickle?
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||
if time.Since(p.lastHeardFrom) <= lastHeardFromTimer {
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break
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}
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if _, err := p.send(p.Transport.NewTicklePacket()); err != nil {
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log.Printf("AURP Peer: Couldn't send Tickle: %v", err)
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return err
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}
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p.setRState(ReceiverWaitForTickleAck)
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p.resetSendRetries()
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p.bumpLastSend()
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case ReceiverWaitForTickleAck:
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if time.Since(p.lastSend) <= sendRetryTimer {
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break
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}
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if p.sendRetries >= tickleRetryLimit {
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log.Printf("AURP Peer: Send retry limit reached while waiting for Tickle-Ack, closing connection")
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p.setRState(ReceiverUnconnected)
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p.RouteTable.DeleteAURPPeer(p)
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break
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}
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p.incSendRetries()
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p.bumpLastSend()
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if _, err := p.send(p.Transport.NewTicklePacket()); err != nil {
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log.Printf("AURP Peer: Couldn't send Tickle: %v", err)
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return err
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}
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// still in Wait For Tickle-Ack
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case ReceiverWaitForRIRsp:
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if time.Since(p.lastSend) <= sendRetryTimer {
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break
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}
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if p.sendRetries >= sendRetryLimit {
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log.Printf("AURP Peer: Send retry limit reached while waiting for RI-Rsp, closing connection")
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p.setRState(ReceiverUnconnected)
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p.RouteTable.DeleteAURPPeer(p)
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break
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}
|
||
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// RI-Req is stateless, so we don't need to cache the one we
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// sent earlier just to send it again
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p.incSendRetries()
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p.bumpLastSend()
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if _, err := p.send(p.Transport.NewRIReqPacket()); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send RI-Req packet: %v", err)
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return err
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||
}
|
||
// still in Wait For RI-Rsp
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||
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||
case ReceiverUnconnected:
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||
// Data receiver is unconnected. If data sender is connected,
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// send a null RI-Upd to check if the sender is also unconnected
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if p.sstate == SenderConnected && time.Since(p.lastSend) > sendRetryTimer {
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||
if p.sendRetries >= sendRetryLimit {
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log.Printf("AURP Peer: Send retry limit reached while probing sender connect, closing connection")
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||
}
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p.incSendRetries()
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p.bumpLastSend()
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||
aurp.Inc(&p.Transport.LocalSeq)
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events := aurp.EventTuples{{
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||
EventCode: aurp.EventCodeNull,
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||
}}
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lastRISent = p.Transport.NewRIUpdPacket(events)
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if _, err := p.send(lastRISent); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send RI-Upd packet: %v", err)
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return err
|
||
}
|
||
p.setSState(SenderWaitForRIUpdAck)
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||
}
|
||
|
||
if p.ConfiguredAddr != "" {
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// Periodically try to reconnect, if this peer is in the config file
|
||
if time.Since(p.lastReconnect) <= reconnectTimer {
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break
|
||
}
|
||
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||
// In case it's a DNS name, re-resolve it before reconnecting
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raddr, err := net.ResolveUDPAddr("udp4", p.ConfiguredAddr)
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||
if err != nil {
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||
log.Printf("couldn't resolve UDP address, skipping: %v", err)
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break
|
||
}
|
||
log.Printf("AURP Peer: resolved %q to %v", p.ConfiguredAddr, raddr)
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||
p.RemoteAddr = raddr
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||
|
||
p.bumpLastReconnect()
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||
p.resetSendRetries()
|
||
p.bumpLastSend()
|
||
if _, err := p.send(p.Transport.NewOpenReqPacket(nil)); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send Open-Req packet: %v", err)
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||
return err
|
||
}
|
||
p.setRState(ReceiverWaitForOpenRsp)
|
||
}
|
||
}
|
||
|
||
case <-sticker.C:
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||
switch p.sstate {
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||
case SenderUnconnected:
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||
// Do nothing
|
||
|
||
case SenderConnected:
|
||
if time.Since(p.lastUpdate) <= updateTimer {
|
||
break
|
||
}
|
||
// TODO: is there a routing update to send?
|
||
p.bumpLastUpdate()
|
||
|
||
case SenderWaitForRIRspAck, SenderWaitForRIUpdAck:
|
||
if time.Since(p.lastSend) <= sendRetryTimer {
|
||
break
|
||
}
|
||
if lastRISent == nil {
|
||
log.Print("AURP Peer: sender retry: lastRISent = nil?")
|
||
continue
|
||
}
|
||
if p.sendRetries >= sendRetryLimit {
|
||
log.Printf("AURP Peer: Send retry limit reached, closing connection")
|
||
p.setSState(SenderUnconnected)
|
||
continue
|
||
}
|
||
p.incSendRetries()
|
||
p.bumpLastSend()
|
||
if _, err := p.send(lastRISent); err != nil {
|
||
log.Printf("AURP Peer: Couldn't re-send %T: %v", lastRISent, err)
|
||
return err
|
||
}
|
||
|
||
case SenderWaitForRDAck:
|
||
if time.Since(p.lastSend) <= sendRetryTimer {
|
||
break
|
||
}
|
||
p.setSState(SenderUnconnected)
|
||
}
|
||
|
||
case pkt := <-p.ReceiveCh:
|
||
p.bumpLastHeardFrom()
|
||
|
||
switch pkt := pkt.(type) {
|
||
case *aurp.OpenReqPacket:
|
||
if p.sstate != SenderUnconnected {
|
||
log.Printf("AURP Peer: Open-Req received but sender state is not unconnected (was %v)", p.sstate)
|
||
}
|
||
|
||
// The peer tells us their connection ID in Open-Req.
|
||
p.Transport.RemoteConnID = pkt.ConnectionID
|
||
|
||
// Formulate a response.
|
||
var orsp *aurp.OpenRspPacket
|
||
switch {
|
||
case pkt.Version != 1:
|
||
// Respond with Open-Rsp with unknown version error.
|
||
orsp = p.Transport.NewOpenRspPacket(0, int16(aurp.ErrCodeInvalidVersion), nil)
|
||
|
||
case len(pkt.Options) > 0:
|
||
// Options? OPTIONS? We don't accept no stinkin' _options_
|
||
orsp = p.Transport.NewOpenRspPacket(0, int16(aurp.ErrCodeOptionNegotiation), nil)
|
||
|
||
default:
|
||
// Accept it I guess.
|
||
orsp = p.Transport.NewOpenRspPacket(0, 1, nil)
|
||
}
|
||
|
||
if _, err := p.send(orsp); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send Open-Rsp: %v", err)
|
||
return err
|
||
}
|
||
if orsp.RateOrErrCode >= 0 {
|
||
p.setSState(SenderConnected)
|
||
}
|
||
|
||
// If receiver is unconnected, commence connecting
|
||
if p.rstate == ReceiverUnconnected {
|
||
p.resetSendRetries()
|
||
p.bumpLastSend()
|
||
if _, err := p.send(p.Transport.NewOpenReqPacket(nil)); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send Open-Req packet: %v", err)
|
||
return err
|
||
}
|
||
p.setRState(ReceiverWaitForOpenRsp)
|
||
}
|
||
|
||
case *aurp.OpenRspPacket:
|
||
if p.rstate != ReceiverWaitForOpenRsp {
|
||
log.Printf("AURP Peer: Received Open-Rsp but was not waiting for one (receiver state was %v)", p.rstate)
|
||
}
|
||
if pkt.RateOrErrCode < 0 {
|
||
// It's an error code.
|
||
log.Printf("AURP Peer: Open-Rsp error code from peer %v: %d", p.RemoteAddr.IP, pkt.RateOrErrCode)
|
||
p.setRState(ReceiverUnconnected)
|
||
break
|
||
}
|
||
//log.Printf("AURP Peer: Data receiver is connected!")
|
||
p.setRState(ReceiverConnected)
|
||
|
||
// Send an RI-Req
|
||
p.resetSendRetries()
|
||
if _, err := p.send(p.Transport.NewRIReqPacket()); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send RI-Req packet: %v", err)
|
||
return err
|
||
}
|
||
p.setRState(ReceiverWaitForRIRsp)
|
||
|
||
case *aurp.RIReqPacket:
|
||
if p.sstate != SenderConnected {
|
||
log.Printf("AURP Peer: Received RI-Req but was not expecting one (sender state was %v)", p.sstate)
|
||
}
|
||
|
||
var nets aurp.NetworkTuples
|
||
for _, r := range p.RouteTable.ValidNonAURPRoutes() {
|
||
nets = append(nets, aurp.NetworkTuple{
|
||
Extended: r.Extended,
|
||
RangeStart: r.NetStart,
|
||
RangeEnd: r.NetEnd,
|
||
Distance: r.Distance,
|
||
})
|
||
}
|
||
p.Transport.LocalSeq = 1
|
||
// TODO: Split tuples across multiple packets as required
|
||
lastRISent = p.Transport.NewRIRspPacket(aurp.RoutingFlagLast, nets)
|
||
if _, err := p.send(lastRISent); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send RI-Rsp packet: %v", err)
|
||
return err
|
||
}
|
||
p.setSState(SenderWaitForRIRspAck)
|
||
|
||
case *aurp.RIRspPacket:
|
||
if p.rstate != ReceiverWaitForRIRsp {
|
||
log.Printf("Received RI-Rsp but was not waiting for one (receiver state was %v)", p.rstate)
|
||
}
|
||
|
||
log.Printf("AURP Peer: Learned about these networks: %v", pkt.Networks)
|
||
|
||
for _, nt := range pkt.Networks {
|
||
p.RouteTable.InsertAURPRoute(
|
||
p,
|
||
nt.Extended,
|
||
ddp.Network(nt.RangeStart),
|
||
ddp.Network(nt.RangeEnd),
|
||
nt.Distance+1,
|
||
)
|
||
}
|
||
|
||
// TODO: track which networks we don't have zone info for, and
|
||
// only set SZI for those ?
|
||
if _, err := p.send(p.Transport.NewRIAckPacket(pkt.ConnectionID, pkt.Sequence, aurp.RoutingFlagSendZoneInfo)); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send RI-Ack packet: %v", err)
|
||
return err
|
||
}
|
||
if pkt.Flags&aurp.RoutingFlagLast != 0 {
|
||
// No longer waiting for an RI-Rsp
|
||
p.setRState(ReceiverConnected)
|
||
}
|
||
|
||
case *aurp.RIAckPacket:
|
||
switch p.sstate {
|
||
case SenderWaitForRIRspAck:
|
||
// We sent an RI-Rsp, this is the RI-Ack we expected.
|
||
|
||
case SenderWaitForRIUpdAck:
|
||
// We sent an RI-Upd, this is the RI-Ack we expected.
|
||
|
||
case SenderWaitForRDAck:
|
||
// We sent an RD... Why are we here?
|
||
continue
|
||
|
||
default:
|
||
log.Printf("AURP Peer: Received RI-Ack but was not waiting for one (sender state was %v)", p.sstate)
|
||
}
|
||
|
||
p.setSState(SenderConnected)
|
||
p.resetSendRetries()
|
||
|
||
// If SZI flag is set, send ZI-Rsp (transaction)
|
||
if pkt.Flags&aurp.RoutingFlagSendZoneInfo != 0 {
|
||
// Inspect last routing info packet sent to determine
|
||
// networks to gather names for
|
||
var nets []ddp.Network
|
||
switch last := lastRISent.(type) {
|
||
case *aurp.RIRspPacket:
|
||
for _, nt := range last.Networks {
|
||
nets = append(nets, nt.RangeStart)
|
||
}
|
||
|
||
case *aurp.RIUpdPacket:
|
||
for _, et := range last.Events {
|
||
// Only networks that were added
|
||
if et.EventCode != aurp.EventCodeNA {
|
||
continue
|
||
}
|
||
nets = append(nets, et.RangeStart)
|
||
}
|
||
|
||
}
|
||
zones := p.RouteTable.ZonesForNetworks(nets)
|
||
// TODO: split ZI-Rsp packets similarly to ZIP Replies
|
||
if _, err := p.send(p.Transport.NewZIRspPacket(zones)); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send ZI-Rsp packet: %v", err)
|
||
}
|
||
}
|
||
|
||
// TODO: Continue sending next RI-Rsp (streamed)?
|
||
|
||
if p.rstate == ReceiverUnconnected {
|
||
// Receiver is unconnected, but their receiver sent us an
|
||
// RI-Ack for something
|
||
// Try to reconnect?
|
||
p.resetSendRetries()
|
||
p.bumpLastSend()
|
||
if _, err := p.send(p.Transport.NewOpenReqPacket(nil)); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send Open-Req packet: %v", err)
|
||
return err
|
||
}
|
||
p.setRState(ReceiverWaitForOpenRsp)
|
||
}
|
||
|
||
case *aurp.RIUpdPacket:
|
||
var ackFlag aurp.RoutingFlag
|
||
|
||
for _, et := range pkt.Events {
|
||
log.Printf("AURP Peer: RI-Upd event %v", et)
|
||
switch et.EventCode {
|
||
case aurp.EventCodeNull:
|
||
// Do nothing except respond with RI-Ack
|
||
|
||
case aurp.EventCodeNA:
|
||
if err := p.RouteTable.InsertAURPRoute(
|
||
p,
|
||
et.Extended,
|
||
et.RangeStart,
|
||
et.RangeEnd,
|
||
et.Distance+1,
|
||
); err != nil {
|
||
log.Printf("AURP Peer: couldn't insert route: %v", err)
|
||
}
|
||
ackFlag = aurp.RoutingFlagSendZoneInfo
|
||
|
||
case aurp.EventCodeND:
|
||
p.RouteTable.DeleteAURPPeerNetwork(p, et.RangeStart)
|
||
|
||
case aurp.EventCodeNDC:
|
||
p.RouteTable.UpdateAURPRouteDistance(p, et.RangeStart, et.Distance+1)
|
||
|
||
case aurp.EventCodeNRC:
|
||
// "An exterior router sends a Network Route Change
|
||
// (NRC) event if the path to an exported network
|
||
// through its local internet changes to a path through
|
||
// a tunneling port, causing split-horizoned processing
|
||
// to eliminate that network’s routing information."
|
||
p.RouteTable.DeleteAURPPeerNetwork(p, et.RangeStart)
|
||
|
||
case aurp.EventCodeZC:
|
||
// "This event is reserved for future use."
|
||
}
|
||
}
|
||
|
||
if _, err := p.send(p.Transport.NewRIAckPacket(pkt.ConnectionID, pkt.Sequence, ackFlag)); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send RI-Ack: %v", err)
|
||
return err
|
||
}
|
||
|
||
case *aurp.RDPacket:
|
||
if p.rstate == ReceiverUnconnected || p.rstate == ReceiverWaitForOpenRsp {
|
||
log.Printf("AURP Peer: Received RD but was not expecting one (receiver state was %v)", p.rstate)
|
||
}
|
||
|
||
log.Printf("AURP Peer: Router Down: error code %d %s", pkt.ErrorCode, pkt.ErrorCode)
|
||
p.RouteTable.DeleteAURPPeer(p)
|
||
|
||
// Respond with RI-Ack
|
||
if _, err := p.send(p.Transport.NewRIAckPacket(pkt.ConnectionID, pkt.Sequence, 0)); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send RI-Ack: %v", err)
|
||
return err
|
||
}
|
||
// Connections closed
|
||
p.disconnect()
|
||
|
||
case *aurp.ZIReqPacket:
|
||
// TODO: split ZI-Rsp packets similarly to ZIP Replies
|
||
zones := p.RouteTable.ZonesForNetworks(pkt.Networks)
|
||
if _, err := p.send(p.Transport.NewZIRspPacket(zones)); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send ZI-Rsp packet: %v", err)
|
||
return err
|
||
}
|
||
|
||
case *aurp.ZIRspPacket:
|
||
log.Printf("AURP Peer: Learned about these zones: %v", pkt.Zones)
|
||
for _, zt := range pkt.Zones {
|
||
p.RouteTable.AddZonesToNetwork(zt.Network, zt.Name)
|
||
}
|
||
|
||
case *aurp.GDZLReqPacket:
|
||
if _, err := p.send(p.Transport.NewGDZLRspPacket(-1, nil)); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send GDZL-Rsp packet: %v", err)
|
||
return err
|
||
}
|
||
|
||
case *aurp.GDZLRspPacket:
|
||
log.Printf("AURP Peer: Received a GDZL-Rsp, but I wouldn't have sent a GDZL-Req - that's weird")
|
||
|
||
case *aurp.GZNReqPacket:
|
||
if _, err := p.send(p.Transport.NewGZNRspPacket(pkt.ZoneName, false, nil)); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send GZN-Rsp packet: %v", err)
|
||
return err
|
||
}
|
||
|
||
case *aurp.GZNRspPacket:
|
||
log.Printf("AURP Peer: Received a GZN-Rsp, but I wouldn't have sent a GZN-Req - that's weird")
|
||
|
||
case *aurp.TicklePacket:
|
||
// Immediately respond with Tickle-Ack
|
||
if _, err := p.send(p.Transport.NewTickleAckPacket()); err != nil {
|
||
log.Printf("AURP Peer: Couldn't send Tickle-Ack: %v", err)
|
||
return err
|
||
}
|
||
|
||
case *aurp.TickleAckPacket:
|
||
if p.rstate != ReceiverWaitForTickleAck {
|
||
log.Printf("AURP Peer: Received Tickle-Ack but was not waiting for one (receiver state was %v)", p.rstate)
|
||
}
|
||
p.setRState(ReceiverConnected)
|
||
}
|
||
}
|
||
}
|
||
}
|