508 lines
13 KiB
Go
508 lines
13 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 main
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import (
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"bufio"
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"cmp"
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"context"
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"errors"
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"flag"
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"fmt"
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"log"
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"math/rand/v2"
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"net"
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"net/http"
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"os"
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"os/signal"
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"regexp"
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"runtime/debug"
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"slices"
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"strings"
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"sync"
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"time"
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"gitea.drjosh.dev/josh/jrouter/aurp"
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"gitea.drjosh.dev/josh/jrouter/router"
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"gitea.drjosh.dev/josh/jrouter/status"
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"github.com/google/gopacket/pcap"
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"github.com/sfiera/multitalk/pkg/ddp"
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"github.com/sfiera/multitalk/pkg/ethernet"
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)
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const routingTableTemplate = `
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<table>
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<thead><tr>
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<th>Network range</th>
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<th>Extended?</th>
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<th>Zone names</th>
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<th>Distance</th>
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<th>Last seen</th>
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<th>Port</th>
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</tr></thead>
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<tbody>
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{{range $route := . }}
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<tr>
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<td>{{$route.NetStart}}{{if not (eq $route.NetStart $route.NetEnd)}} - {{$route.NetEnd}}{{end}}</td>
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<td>{{if $route.Extended}}✅{{else}}-{{end}}</td>
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<td>{{range $route.ZoneNames.ToSlice}}{{.}}<br>{{end}}</td>
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<td>{{$route.Distance}}</td>
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<td>{{$route.LastSeenAgo}}</td>
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<td>
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{{- with $route.AURPPeer -}}
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{{.RemoteAddr}}
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{{- end -}}
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{{- with $route.EtherTalkPeer -}}
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{{.Port.Device}} {{.PeerAddr.Network}}.{{.PeerAddr.Node}}
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{{- end -}}
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{{- with $route.EtherTalkDirect -}}
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{{.Device}} {{.NetStart}}-{{.NetEnd}}
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{{- end -}}
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</td>
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</tr>
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{{end}}
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</tbody>
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</table>
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`
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const peerTableTemplate = `
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<table>
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<thead><tr>
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<th>Configured addr</th>
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<th>Remote addr</th>
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<th>Receiver state</th>
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<th>Sender state</th>
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</tr></thead>
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<tbody>
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{{range $peer := . }}
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<tr>
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<td>{{$peer.ConfiguredAddr}}</td>
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<td>{{$peer.RemoteAddr}}</td>
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<td>{{$peer.ReceiverState}}</td>
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<td>{{$peer.SenderState}}</td>
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</tr>
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{{end}}
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</tbody>
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</table>
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`
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var hasPortRE = regexp.MustCompile(`:\d+$`)
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var configFilePath = flag.String("config", "jrouter.yaml", "Path to configuration file to use")
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func main() {
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// For some reason it occasionally panics and the panics have no traceback?
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debug.SetTraceback("all")
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flag.Parse()
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log.Println("jrouter")
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cfg, err := router.LoadConfig(*configFilePath)
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if err != nil {
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log.Fatalf("Couldn't load configuration file: %v", err)
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}
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localIP := net.ParseIP(cfg.LocalIP).To4()
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if localIP == nil {
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iaddrs, err := net.InterfaceAddrs()
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if err != nil {
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log.Fatalf("Couldn't read network interface addresses: %v", err)
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}
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for _, iaddr := range iaddrs {
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inet, ok := iaddr.(*net.IPNet)
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if !ok {
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continue
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}
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if !inet.IP.IsGlobalUnicast() {
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continue
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}
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localIP = inet.IP.To4()
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if localIP != nil {
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break
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}
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}
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if localIP == nil {
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log.Fatalf("No global unicast IPv4 addresses on any network interfaces, and no valid local_ip address in configuration")
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}
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}
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localDI := aurp.IPDomainIdentifier(localIP)
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log.Printf("Using %v as local domain identifier", localIP)
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log.Printf("EtherTalk configuration: %+v", cfg.EtherTalk)
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ln, err := net.ListenUDP("udp4", &net.UDPAddr{Port: int(cfg.ListenPort)})
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if err != nil {
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log.Fatalf("AURP: Couldn't listen on udp4:387: %v", err)
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}
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defer ln.Close()
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log.Printf("AURP: Listening on %v", ln.LocalAddr())
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log.Println("Press ^C or send SIGINT to stop the router gracefully")
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cctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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ctx, _ := signal.NotifyContext(cctx, os.Interrupt)
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// --------------------------------- HTTP ---------------------------------
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http.HandleFunc("/status", status.Handle)
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go func() {
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log.Print(http.ListenAndServe(":9459", nil))
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}()
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// --------------------------------- Pcap ---------------------------------
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// First check the interface
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iface, err := net.InterfaceByName(cfg.EtherTalk.Device)
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if err != nil {
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log.Fatalf("Couldn't find interface named %q: %v", cfg.EtherTalk.Device, err)
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}
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myHWAddr := ethernet.Addr(iface.HardwareAddr)
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if cfg.EtherTalk.EthAddr != "" {
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// Override myHWAddr with the configured address
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netHWAddr, err := net.ParseMAC(cfg.EtherTalk.EthAddr)
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if err != nil {
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log.Fatalf("Couldn't parse ethertalk.ethernet_addr value %q: %v", cfg.EtherTalk.EthAddr, err)
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}
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myHWAddr = ethernet.Addr(netHWAddr)
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}
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pcapHandle, err := pcap.OpenLive(cfg.EtherTalk.Device, 4096, true, 100*time.Millisecond)
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if err != nil {
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log.Fatalf("Couldn't open %q for packet capture: %v", cfg.EtherTalk.Device, err)
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}
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bpfFilter := fmt.Sprintf("(atalk or aarp) and (ether multicast or ether dst %s)", myHWAddr)
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if err := pcapHandle.SetBPFFilter(bpfFilter); err != nil {
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pcapHandle.Close()
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log.Fatalf("Couldn't set BPF filter on packet capture: %v", err)
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}
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defer pcapHandle.Close()
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// -------------------------------- Tables --------------------------------
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routes := router.NewRouteTable()
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status.AddItem(ctx, "Routing table", routingTableTemplate, func(context.Context) (any, error) {
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rs := routes.Dump()
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slices.SortFunc(rs, func(ra, rb router.Route) int {
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return cmp.Compare(ra.NetStart, rb.NetStart)
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})
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return rs, nil
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})
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// -------------------------------- Peers ---------------------------------
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var peersMu sync.Mutex
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peers := make(map[udpAddr]*router.AURPPeer)
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status.AddItem(ctx, "AURP Peers", peerTableTemplate, func(context.Context) (any, error) {
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var peerInfo []*router.AURPPeer
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func() {
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peersMu.Lock()
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defer peersMu.Unlock()
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peerInfo = make([]*router.AURPPeer, 0, len(peers))
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for _, p := range peers {
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peerInfo = append(peerInfo, p)
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}
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}()
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slices.SortFunc(peerInfo, func(pa, pb *router.AURPPeer) int {
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return cmp.Or(
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-cmp.Compare(
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bool2Int(pa.ReceiverState() == router.ReceiverConnected),
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bool2Int(pb.ReceiverState() == router.ReceiverConnected),
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),
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-cmp.Compare(
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bool2Int(pa.SenderState() == router.SenderConnected),
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bool2Int(pb.SenderState() == router.SenderConnected),
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),
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cmp.Compare(pa.ConfiguredAddr, pb.ConfiguredAddr),
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)
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})
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return peerInfo, nil
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})
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var nextConnID uint16
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for nextConnID == 0 {
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nextConnID = uint16(rand.IntN(0x10000))
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}
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var wg sync.WaitGroup
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goPeerHandler := func(p *router.AURPPeer) {
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wg.Add(1)
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go func() {
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defer wg.Done()
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p.Handle(ctx)
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}()
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}
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// ------------------------- Configured peer setup ------------------------
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if cfg.PeerListURL != "" {
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log.Printf("Fetching peer list from %s...", cfg.PeerListURL)
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existing := len(cfg.Peers)
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func() {
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resp, err := http.Get(cfg.PeerListURL)
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if err != nil {
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log.Fatalf("Couldn't fetch peer list: %v", err)
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}
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defer resp.Body.Close()
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sc := bufio.NewScanner(resp.Body)
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for sc.Scan() {
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p := strings.TrimSpace(sc.Text())
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if p == "" {
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continue
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}
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cfg.Peers = append(cfg.Peers, p)
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}
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if err := sc.Err(); err != nil {
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log.Fatalf("Couldn't scan peer list response: %v", err)
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}
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}()
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log.Printf("Fetched list containing %d peers", len(cfg.Peers)-existing)
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}
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for _, peerStr := range cfg.Peers {
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if !hasPortRE.MatchString(peerStr) {
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peerStr += ":387"
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}
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raddr, err := net.ResolveUDPAddr("udp4", peerStr)
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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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continue
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}
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log.Printf("resolved %q to %v", peerStr, raddr)
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if raddr.IP.Equal(localIP) {
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log.Printf("%v == %v == me, skipping", peerStr, raddr)
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continue
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}
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peer := &router.AURPPeer{
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Transport: &aurp.Transport{
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LocalDI: localDI,
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RemoteDI: aurp.IPDomainIdentifier(raddr.IP),
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LocalConnID: nextConnID,
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},
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UDPConn: ln,
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ConfiguredAddr: peerStr,
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RemoteAddr: raddr,
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ReceiveCh: make(chan aurp.Packet, 1024),
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RouteTable: routes,
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}
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aurp.Inc(&nextConnID)
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peersMu.Lock()
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peers[udpAddrFromNet(raddr)] = peer
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peersMu.Unlock()
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goPeerHandler(peer)
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}
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// --------------------------------- AARP ---------------------------------
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aarpMachine := router.NewAARPMachine(cfg, pcapHandle, myHWAddr)
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go aarpMachine.Run(ctx)
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// -------------------------------- Router --------------------------------
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rooter := &router.Router{
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Config: cfg,
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RouteTable: routes,
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// ZoneTable: zones,
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}
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etherTalkPort := &router.EtherTalkPort{
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Device: cfg.EtherTalk.Device,
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EthernetAddr: myHWAddr,
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NetStart: cfg.EtherTalk.NetStart,
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NetEnd: cfg.EtherTalk.NetEnd,
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DefaultZoneName: cfg.EtherTalk.ZoneName,
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AvailableZones: router.SetFromSlice([]string{cfg.EtherTalk.ZoneName}),
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PcapHandle: pcapHandle,
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AARPMachine: aarpMachine,
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Router: rooter,
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}
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rooter.Ports = append(rooter.Ports, etherTalkPort)
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routes.InsertEtherTalkDirect(etherTalkPort)
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// --------------------------------- RTMP ---------------------------------
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go etherTalkPort.RunRTMP(ctx)
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// ---------------------- Raw AppleTalk/AARP inbound ----------------------
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wg.Add(1)
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go func() {
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defer wg.Done()
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ctx, setStatus, _ := status.AddSimpleItem(ctx, "EtherTalk inbound")
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defer setStatus("EtherTalk Serve goroutine exited!")
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setStatus(fmt.Sprintf("Listening on %s", cfg.EtherTalk.Device))
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etherTalkPort.Serve(ctx)
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}()
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// ----------------------------- AURP inbound -----------------------------
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wg.Add(1)
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go func() {
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defer wg.Done()
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ctx, setStatus, done := status.AddSimpleItem(ctx, "AURP inbound")
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defer done()
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setStatus(fmt.Sprintf("Listening on UDP port %d", cfg.ListenPort))
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for {
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if ctx.Err() != nil {
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return
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}
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ln.SetReadDeadline(time.Now().Add(100 * time.Millisecond))
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pktbuf := make([]byte, 4096)
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pktlen, raddr, readErr := ln.ReadFromUDP(pktbuf)
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var operr *net.OpError
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if errors.As(readErr, &operr) && operr.Timeout() {
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continue
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}
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// log.Printf("AURP: Received packet of length %d from %v", pktlen, raddr)
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dh, pkt, parseErr := aurp.ParsePacket(pktbuf[:pktlen])
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if parseErr != nil {
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log.Printf("AURP: Failed to parse packet: %v", parseErr)
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continue
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}
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if readErr != nil {
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log.Printf("AURP: Failed to read packet: %v", readErr)
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return
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}
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log.Printf("AURP: Got %T from %v (%v)", pkt, raddr, dh.SourceDI)
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// Existing peer?
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ra := udpAddrFromNet(raddr)
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peersMu.Lock()
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pr := peers[ra]
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if pr == nil {
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if !cfg.OpenPeering {
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log.Printf("AURP: Got packet from %v but it's not in my config and open peering is disabled; dropping the packet", raddr)
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peersMu.Unlock()
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continue
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}
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// New peer!
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pr = &router.AURPPeer{
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Transport: &aurp.Transport{
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LocalDI: localDI,
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RemoteDI: dh.SourceDI, // platinum rule
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LocalConnID: nextConnID,
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},
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UDPConn: ln,
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RemoteAddr: raddr,
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ReceiveCh: make(chan aurp.Packet, 1024),
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RouteTable: routes,
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}
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aurp.Inc(&nextConnID)
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peers[ra] = pr
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goPeerHandler(pr)
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}
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peersMu.Unlock()
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switch dh.PacketType {
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case aurp.PacketTypeRouting:
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// It's AURP routing data.
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// Pass the packet to the goroutine in charge of this peer.
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select {
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case pr.ReceiveCh <- pkt:
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// That's it for us.
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case <-ctx.Done():
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return
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}
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continue
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case aurp.PacketTypeAppleTalk:
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apkt, ok := pkt.(*aurp.AppleTalkPacket)
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if !ok {
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log.Printf("AURP: Got %T but domain header packet type was %v ?", pkt, dh.PacketType)
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continue
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}
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// Route or otherwise handle the encapsulated AppleTalk traffic
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ddpkt := new(ddp.ExtPacket)
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if err := ddp.ExtUnmarshal(apkt.Data, ddpkt); err != nil {
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log.Printf("AURP: Couldn't unmarshal encapsulated DDP packet: %v", err)
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continue
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}
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// log.Printf("DDP/AURP: Got %d.%d.%d -> %d.%d.%d proto %d data len %d",
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// ddpkt.SrcNet, ddpkt.SrcNode, ddpkt.SrcSocket,
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// ddpkt.DstNet, ddpkt.DstNode, ddpkt.DstSocket,
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// ddpkt.Proto, len(ddpkt.Data))
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// Is it addressed to me?
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var localPort *router.EtherTalkPort
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for _, port := range rooter.Ports {
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if ddpkt.DstNet >= port.NetStart && ddpkt.DstNet <= port.NetEnd {
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localPort = port
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break
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}
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}
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if ddpkt.DstNode == 0 && localPort != nil { // Node 0 = any router for the network = me
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// Is it NBP? FwdReq needs translating.
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if ddpkt.DstSocket != 2 {
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// Something else?? TODO
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log.Printf("DDP/AURP: I don't have anything 'listening' on socket %d", ddpkt.DstSocket)
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continue
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}
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// It's NBP, specifically it should be a FwdReq
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if err := rooter.HandleNBPFromAURP(ctx, ddpkt); err != nil {
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log.Printf("NBP/DDP/AURP: %v", err)
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}
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continue
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}
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// Route the packet!
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if err := rooter.Forward(ctx, ddpkt); err != nil {
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log.Printf("DDP/AURP: Couldn't route packet: %v", err)
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}
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default:
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log.Printf("AURP: Got unknown packet type %v", dh.PacketType)
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}
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}
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}()
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// -------------------------------- Close ---------------------------------
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wg.Wait()
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}
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// Hashable net.UDPAddr
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type udpAddr struct {
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ipv4 [4]byte
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port uint16
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}
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func udpAddrFromNet(a *net.UDPAddr) udpAddr {
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return udpAddr{
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ipv4: [4]byte(a.IP.To4()),
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port: uint16(a.Port),
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}
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}
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func (u udpAddr) toNet() *net.UDPAddr {
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return &net.UDPAddr{
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IP: u.ipv4[:],
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Port: int(u.port),
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}
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}
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func bool2Int(b bool) int {
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if b {
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return 1
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}
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return 0
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}
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