706 lines
20 KiB
Go
706 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 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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"io"
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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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"github.com/sfiera/multitalk/pkg/ethertalk"
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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>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 $route.Extended}}✅{{else}}❌{{end}}</td>
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<td>{{$route.Distance}}</td>
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<td>{{$route.LastSeenAgo}}</td>
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<td>{{if $route.AURPPeer}}{{$route.AURPPeer.RemoteAddr}}{{else if $route.EtherTalkPeer}}{{$route.EtherTalkPeer.PeerAddr.Network}}.{{$route.EtherTalkPeer.PeerAddr.Node}}{{else}}-{{end}}</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 zoneTableTemplate = `
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<table>
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<thead><tr>
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<th>Network</th>
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<th>Name</th>
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<th>Local</th>
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<th>Last seen</th>
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</tr></thead>
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<tbody>
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{{range $zone := . }}
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<tr>
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<td>{{$zone.Network}}</td>
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<td>{{$zone.Name}}</td>
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<td>{{if $zone.Local}}✅{{else}}❌{{end}}</td>
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<td>{{$zone.LastSeenAgo}}</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("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("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.NewRoutingTable()
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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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zones := router.NewZoneTable()
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zones.Upsert(cfg.EtherTalk.NetStart, cfg.EtherTalk.ZoneName, true)
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status.AddItem(ctx, "Zone table", zoneTableTemplate, func(context.Context) (any, error) {
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zs := zones.Dump()
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slices.SortFunc(zs, func(za, zb router.Zone) int {
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return cmp.Compare(za.Name, zb.Name)
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})
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return zs, 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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Config: cfg,
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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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RoutingTable: routes,
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ZoneTable: zones,
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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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aarpCh := make(chan *ethertalk.Packet, 1024)
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go aarpMachine.Run(ctx, aarpCh)
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// --------------------------------- RTMP ---------------------------------
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rtmpMachine := &router.RTMPMachine{
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AARP: aarpMachine,
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Config: cfg,
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PcapHandle: pcapHandle,
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RoutingTable: routes,
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}
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rtmpCh := make(chan *ddp.ExtPacket, 1024)
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go rtmpMachine.Run(ctx, rtmpCh)
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// -------------------------------- Router --------------------------------
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rooter := &router.Router{
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Config: cfg,
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PcapHandle: pcapHandle,
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MyHWAddr: myHWAddr,
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// MyDDPAddr: ...,
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AARPMachine: aarpMachine,
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RouteTable: routes,
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ZoneTable: zones,
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}
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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, done := status.AddSimpleItem(ctx, "EtherTalk inbound")
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defer done()
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setStatus(fmt.Sprintf("Listening on %s", cfg.EtherTalk.Device))
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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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rawPkt, _, err := pcapHandle.ReadPacketData()
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if errors.Is(err, pcap.NextErrorTimeoutExpired) {
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continue
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}
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if errors.Is(err, io.EOF) || errors.Is(err, pcap.NextErrorNoMorePackets) {
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return
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}
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if err != nil {
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log.Printf("Couldn't read AppleTalk / AARP packet data: %v", err)
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return
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}
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ethFrame := new(ethertalk.Packet)
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if err := ethertalk.Unmarshal(rawPkt, ethFrame); err != nil {
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log.Printf("Couldn't unmarshal EtherTalk frame: %v", err)
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continue
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}
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// Ignore if sent by me
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if ethFrame.Src == myHWAddr {
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continue
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}
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switch ethFrame.SNAPProto {
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case ethertalk.AARPProto:
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// log.Print("Got an AARP frame")
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aarpCh <- ethFrame
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case ethertalk.AppleTalkProto:
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// log.Print("Got an AppleTalk frame")
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ddpkt := new(ddp.ExtPacket)
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if err := ddp.ExtUnmarshal(ethFrame.Payload, ddpkt); err != nil {
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log.Printf("Couldn't unmarshal DDP packet: %v", err)
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continue
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}
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log.Printf("DDP: src (%d.%d s %d) dst (%d.%d s %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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// Glean address info for AMT, but only if SrcNet is our net
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// (If it's not our net, then it was routed from elsewhere, and
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// we'd be filling the AMT with entries for a router.)
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if ddpkt.SrcNet >= cfg.EtherTalk.NetStart && ddpkt.SrcNet <= cfg.EtherTalk.NetEnd {
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srcAddr := ddp.Addr{Network: ddpkt.SrcNet, Node: ddpkt.SrcNode}
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aarpMachine.Learn(srcAddr, ethFrame.Src)
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// log.Printf("DDP: Gleaned that %d.%d -> %v", srcAddr.Network, srcAddr.Node, ethFrame.Src)
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}
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// Packet for us? First, who am I?
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myAddr, ok := aarpMachine.Address()
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if !ok {
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continue
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}
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rooter.MyDDPAddr = myAddr.Proto
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// Our network?
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// "The network number 0 is reserved to mean unknown; by default
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// it specifies the local network to which the node is
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// connected. Packets whose destination network number is 0 are
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// addressed to a node on the local network."
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// TODO: more generic routing
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if ddpkt.DstNet != 0 && !(ddpkt.DstNet >= cfg.EtherTalk.NetStart && ddpkt.DstNet <= cfg.EtherTalk.NetEnd) {
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// Is it for a network in the routing table?
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route := routes.LookupRoute(ddpkt.DstNet)
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if route == nil {
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log.Printf("DDP: no route for network %d", ddpkt.DstNet)
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continue
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}
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switch {
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case route.AURPPeer != nil:
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// Encap ethPacket.Payload into an AURP packet
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log.Printf("DDP: forwarding to AURP peer %v", route.AURPPeer.RemoteAddr)
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if _, err := route.AURPPeer.Send(route.AURPPeer.Transport.NewAppleTalkPacket(ethFrame.Payload)); err != nil {
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log.Printf("DDP: Couldn't forward packet to AURP peer: %v", err)
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}
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case route.EtherTalkPeer != nil:
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// Route payload to another router over EtherTalk
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// TODO: this is unlikely because we currenly only support 1 EtherTalk port
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log.Printf("DDP: forwarding to EtherTalk peer %v", route.EtherTalkPeer.PeerAddr)
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// Note: resolving AARP can block
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if err := route.EtherTalkPeer.Forward(ctx, ddpkt); err != nil {
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log.Printf("DDP: Couldn't forward packet to EtherTalk peer: %v", err)
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}
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default:
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log.Print("DDP: no forwarding mechanism for route; dropping packet")
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}
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continue
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}
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// To me?
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// "Node ID 0 indicates any router on the network"- I'm a router
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// "node ID $FF indicates either a network-wide or zone-specific
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// broadcast"- that's relevant
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if ddpkt.DstNode != 0 && ddpkt.DstNode != 0xff && ddpkt.DstNode != myAddr.Proto.Node {
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continue
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}
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switch ddpkt.DstSocket {
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case 1: // The RTMP socket
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rtmpCh <- ddpkt
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case 2: // The NIS (name information socket / NBP socket)
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if err := rooter.HandleNBP(ethFrame.Src, ddpkt); err != nil {
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log.Printf("NBP: Couldn't handle: %v", err)
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}
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case 4: // The AEP socket
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if err := rooter.HandleAEP(ethFrame.Src, ddpkt); err != nil {
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log.Printf("AEP: Couldn't handle: %v", err)
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}
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case 6: // The ZIS (zone information socket / ZIP socket)
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if err := rooter.HandleZIP(ctx, ethFrame.Src, ddpkt); err != nil {
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log.Printf("ZIP: couldn't handle: %v", err)
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}
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default:
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log.Printf("DDP: No handler for socket %d", ddpkt.DstSocket)
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}
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default:
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log.Printf("Read unknown packet %s -> %s with payload %x", ethFrame.Src, ethFrame.Dst, ethFrame.Payload)
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}
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}
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}()
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// ----------------------------- AURP inbound -----------------------------
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wg.Add(1)
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|
go func() {
|
|
defer wg.Done()
|
|
|
|
ctx, setStatus, done := status.AddSimpleItem(ctx, "AURP inbound")
|
|
defer done()
|
|
setStatus(fmt.Sprintf("Listening on UDP port %d", cfg.ListenPort))
|
|
|
|
for {
|
|
if ctx.Err() != nil {
|
|
return
|
|
}
|
|
ln.SetReadDeadline(time.Now().Add(100 * time.Millisecond))
|
|
pktbuf := make([]byte, 4096)
|
|
pktlen, raddr, readErr := ln.ReadFromUDP(pktbuf)
|
|
|
|
var operr *net.OpError
|
|
if errors.As(readErr, &operr) && operr.Timeout() {
|
|
continue
|
|
}
|
|
|
|
// log.Printf("AURP: Received packet of length %d from %v", pktlen, raddr)
|
|
|
|
dh, pkt, parseErr := aurp.ParsePacket(pktbuf[:pktlen])
|
|
if parseErr != nil {
|
|
log.Printf("AURP: Failed to parse packet: %v", parseErr)
|
|
continue
|
|
}
|
|
if readErr != nil {
|
|
log.Printf("AURP: Failed to read packet: %v", readErr)
|
|
return
|
|
}
|
|
|
|
log.Printf("AURP: Got %T from %v (%v)", pkt, raddr, dh.SourceDI)
|
|
|
|
// Existing peer?
|
|
ra := udpAddrFromNet(raddr)
|
|
peersMu.Lock()
|
|
pr := peers[ra]
|
|
if pr == nil {
|
|
if !cfg.OpenPeering {
|
|
log.Printf("AURP: Got packet from %v but it's not in my config and open peering is disabled; dropping the packet", raddr)
|
|
peersMu.Unlock()
|
|
continue
|
|
}
|
|
// New peer!
|
|
pr = &router.AURPPeer{
|
|
Config: cfg,
|
|
Transport: &aurp.Transport{
|
|
LocalDI: localDI,
|
|
RemoteDI: dh.SourceDI, // platinum rule
|
|
LocalConnID: nextConnID,
|
|
},
|
|
UDPConn: ln,
|
|
RemoteAddr: raddr,
|
|
ReceiveCh: make(chan aurp.Packet, 1024),
|
|
RoutingTable: routes,
|
|
ZoneTable: zones,
|
|
}
|
|
aurp.Inc(&nextConnID)
|
|
peers[ra] = pr
|
|
goPeerHandler(pr)
|
|
}
|
|
peersMu.Unlock()
|
|
|
|
switch dh.PacketType {
|
|
case aurp.PacketTypeRouting:
|
|
// It's AURP routing data.
|
|
// Pass the packet to the goroutine in charge of this peer.
|
|
select {
|
|
case pr.ReceiveCh <- pkt:
|
|
// That's it for us.
|
|
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
continue
|
|
|
|
case aurp.PacketTypeAppleTalk:
|
|
apkt, ok := pkt.(*aurp.AppleTalkPacket)
|
|
if !ok {
|
|
log.Printf("AURP: Got %T but domain header packet type was %v ?", pkt, dh.PacketType)
|
|
continue
|
|
}
|
|
|
|
// Route or otherwise handle the encapsulated AppleTalk traffic
|
|
ddpkt := new(ddp.ExtPacket)
|
|
if err := ddp.ExtUnmarshal(apkt.Data, ddpkt); err != nil {
|
|
log.Printf("AURP: Couldn't unmarshal encapsulated DDP packet: %v", err)
|
|
continue
|
|
}
|
|
log.Printf("DDP/AURP: Got %d.%d.%d -> %d.%d.%d proto %d data len %d",
|
|
ddpkt.SrcNet, ddpkt.SrcNode, ddpkt.SrcSocket,
|
|
ddpkt.DstNet, ddpkt.DstNode, ddpkt.DstSocket,
|
|
ddpkt.Proto, len(ddpkt.Data))
|
|
|
|
// Route the packet
|
|
|
|
// Check and adjust the Hop Count
|
|
// Note the ddp package doesn't make this simple
|
|
hopCount := (ddpkt.Size & 0x3C00) >> 10
|
|
if hopCount >= 15 {
|
|
log.Printf("DDP/AURP: hop count exceeded (%d >= 15)", hopCount)
|
|
continue
|
|
}
|
|
hopCount++
|
|
ddpkt.Size &^= 0x3C00
|
|
ddpkt.Size |= hopCount << 10
|
|
|
|
if ddpkt.DstNet < cfg.EtherTalk.NetStart || ddpkt.DstNet > cfg.EtherTalk.NetEnd {
|
|
// Is it a network in the routing table?
|
|
route := routes.LookupRoute(ddpkt.DstNet)
|
|
if route == nil {
|
|
log.Printf("DDP/AURP: no route for packet (dstnet %d); dropping packet", ddpkt.DstNet)
|
|
break
|
|
}
|
|
|
|
switch {
|
|
case route.AURPPeer != nil:
|
|
// Routing between AURP peers... bit weird but OK
|
|
log.Printf("DDP/AURP: forwarding to AURP peer %v", route.AURPPeer.RemoteAddr)
|
|
outPkt, err := ddp.ExtMarshal(*ddpkt)
|
|
if err != nil {
|
|
log.Printf("DDP/AURP: Couldn't re-marshal packet: %v", err)
|
|
break
|
|
}
|
|
if _, err := route.AURPPeer.Send(route.AURPPeer.Transport.NewAppleTalkPacket(outPkt)); err != nil {
|
|
log.Printf("DDP/AURP: Couldn't forward packet to AURP peer: %v", err)
|
|
}
|
|
|
|
case route.EtherTalkPeer != nil:
|
|
// AURP peer -> EtherTalk peer
|
|
// Note: resolving AARP can block
|
|
log.Printf("DDP/AURP: forwarding to EtherTalk peer %v", route.EtherTalkPeer.PeerAddr)
|
|
if err := route.EtherTalkPeer.Forward(ctx, ddpkt); err != nil {
|
|
log.Printf("DDP/AURP: Couldn't forward packet to EtherTalk peer: %v", err)
|
|
}
|
|
|
|
default:
|
|
log.Print("DDP/AURP: no forwarding mechanism for route; dropping packet")
|
|
|
|
}
|
|
continue
|
|
}
|
|
|
|
// Is it addressed to me? Is it NBP?
|
|
if ddpkt.DstNode == 0 { // Node 0 = any router for the network = me
|
|
if ddpkt.DstSocket != 2 {
|
|
// Something else?? TODO
|
|
log.Printf("DDP/AURP: I don't have anything 'listening' on socket %d", ddpkt.DstSocket)
|
|
continue
|
|
}
|
|
// It's NBP
|
|
if err := rooter.HandleNBPInAURP(pr, ddpkt); err != nil {
|
|
log.Printf("NBP/DDP/AURP: %v", err)
|
|
}
|
|
continue
|
|
}
|
|
|
|
// Note: resolving AARP can block
|
|
if err := rooter.SendEtherTalkDDP(ctx, ddpkt); err != nil {
|
|
log.Printf("DDP/AURP: couldn't send Ethertalk out: %v", err)
|
|
}
|
|
continue
|
|
|
|
default:
|
|
log.Printf("AURP: Got unknown packet type %v", dh.PacketType)
|
|
}
|
|
}
|
|
}()
|
|
|
|
// -------------------------------- Close ---------------------------------
|
|
wg.Wait()
|
|
}
|
|
|
|
// Hashable net.UDPAddr
|
|
type udpAddr struct {
|
|
ipv4 [4]byte
|
|
port uint16
|
|
}
|
|
|
|
func udpAddrFromNet(a *net.UDPAddr) udpAddr {
|
|
return udpAddr{
|
|
ipv4: [4]byte(a.IP.To4()),
|
|
port: uint16(a.Port),
|
|
}
|
|
}
|
|
|
|
func (u udpAddr) toNet() *net.UDPAddr {
|
|
return &net.UDPAddr{
|
|
IP: u.ipv4[:],
|
|
Port: int(u.port),
|
|
}
|
|
}
|
|
|
|
func bool2Int(b bool) int {
|
|
if b {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|