|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "encoding/base64" |
| 6 | + "flag" |
| 7 | + "fmt" |
| 8 | + "log" |
| 9 | + "net" |
| 10 | + "net/netip" |
| 11 | + "os" |
| 12 | + "path/filepath" |
| 13 | + "time" |
| 14 | + |
| 15 | + "github.com/fxamacker/cbor/v2" |
| 16 | + "tailscale.com/ipn/ipnstate" |
| 17 | + "tailscale.com/ipn/store" |
| 18 | + "tailscale.com/net/netmon" |
| 19 | + "tailscale.com/net/netns" |
| 20 | + "tailscale.com/net/tsdial" |
| 21 | + "tailscale.com/tailcfg" |
| 22 | + "tailscale.com/tsd" |
| 23 | + "tailscale.com/types/key" |
| 24 | + "tailscale.com/types/logger" |
| 25 | + "tailscale.com/wgengine" |
| 26 | + "tailscale.com/wgengine/netstack" |
| 27 | +) |
| 28 | + |
| 29 | +var ( |
| 30 | + flagServer = flag.Bool("serve", false, "be server") |
| 31 | + flagTest = flag.Bool("test", false, "self-test; be a server and connect to ourselves. lazy integration test in package main for now.") |
| 32 | +) |
| 33 | + |
| 34 | +func main() { |
| 35 | + flag.Parse() |
| 36 | + if *flagTest { |
| 37 | + doTest() |
| 38 | + return |
| 39 | + } |
| 40 | + if *flagServer { |
| 41 | + cb, sys, err := beServer() |
| 42 | + if err != nil { |
| 43 | + log.Fatal(err) |
| 44 | + } |
| 45 | + log.Printf(">>> Listening on: %v", cb) |
| 46 | + |
| 47 | + mc := sys.MagicSock.Get() |
| 48 | + for { |
| 49 | + time.Sleep(5 * time.Second) |
| 50 | + var sb ipnstate.StatusBuilder |
| 51 | + mc.UpdateStatus(&sb) |
| 52 | + log.Printf("status = %v", logger.AsJSON(sb.Status())) |
| 53 | + } |
| 54 | + } |
| 55 | + log.Fatalf("usage: ...") |
| 56 | +} |
| 57 | + |
| 58 | +func doTest() { |
| 59 | + cb, sys, err := beServer() |
| 60 | + if err != nil { |
| 61 | + log.Fatal(err) |
| 62 | + } |
| 63 | + log.Printf(">>> Listening on: %v", cb) |
| 64 | + _ = sys |
| 65 | + |
| 66 | +} |
| 67 | + |
| 68 | +// ConnBlob is the base64 encoded cbor of ConnInfo. |
| 69 | +type ConnBlob string |
| 70 | + |
| 71 | +type ConnInfo struct { |
| 72 | + ServerPub key.NodePublic `cbor:"p"` |
| 73 | + Region *tailcfg.DERPRegion `cbor:"r"` |
| 74 | +} |
| 75 | + |
| 76 | +func beServer() (ConnBlob, *tsd.System, error) { |
| 77 | + var ci ConnInfo |
| 78 | + priv := key.NewNode() |
| 79 | + ci.ServerPub = priv.Public() |
| 80 | + |
| 81 | + ci.Region = &tailcfg.DERPRegion{ |
| 82 | + RegionID: 10, |
| 83 | + RegionCode: "sea", |
| 84 | + Nodes: []*tailcfg.DERPNode{ |
| 85 | + { |
| 86 | + HostName: "derp10b.tailscale.com", |
| 87 | + IPv4: "192.73.240.161", |
| 88 | + }, |
| 89 | + { |
| 90 | + HostName: "derp10c.tailscale.com", |
| 91 | + IPv4: "192.73.240.121", |
| 92 | + }, |
| 93 | + }, |
| 94 | + } |
| 95 | + |
| 96 | + x, err := cbor.Marshal(&ci) |
| 97 | + if err != nil { |
| 98 | + return "", nil, fmt.Errorf("cbor.Marshal: %w", err) |
| 99 | + } |
| 100 | + connBlob := ConnBlob(base64.StdEncoding.EncodeToString(x)) |
| 101 | + log.Printf(">>> Starting to listen on: %v", connBlob) |
| 102 | + |
| 103 | + var logf logger.Logf = log.Printf |
| 104 | + sys := new(tsd.System) |
| 105 | + netMon, err := netmon.New(func(format string, args ...any) { |
| 106 | + logf(format, args...) |
| 107 | + }) |
| 108 | + if err != nil { |
| 109 | + return "", nil, fmt.Errorf("netmon.New: %w", err) |
| 110 | + } |
| 111 | + sys.Set(netMon) |
| 112 | + |
| 113 | + dialer := &tsdial.Dialer{Logf: logf} // mutated below (before used) |
| 114 | + sys.Set(dialer) |
| 115 | + |
| 116 | + store, err := store.New(logf, filepath.Join(os.Getenv("HOME"), ".config", "tsdc.state")) |
| 117 | + if err != nil { |
| 118 | + return "", nil, fmt.Errorf("store.New: %w", err) |
| 119 | + } |
| 120 | + sys.Set(store) |
| 121 | + |
| 122 | + if err := createEngine(logf, sys); err != nil { |
| 123 | + return "", nil, fmt.Errorf("createEngine: %w", err) |
| 124 | + } |
| 125 | + ns, err := newNetstack(logf, sys) |
| 126 | + if err != nil { |
| 127 | + return "", nil, fmt.Errorf("newNetstack: %w", err) |
| 128 | + } |
| 129 | + ns.ProcessLocalIPs = true |
| 130 | + ns.ProcessSubnets = true |
| 131 | + |
| 132 | + e := sys.Engine.Get() |
| 133 | + dialer.UseNetstackForIP = func(ip netip.Addr) bool { |
| 134 | + _, ok := e.PeerForIP(ip) |
| 135 | + return ok |
| 136 | + } |
| 137 | + dialer.NetstackDialTCP = func(ctx context.Context, dst netip.AddrPort) (net.Conn, error) { |
| 138 | + return ns.DialContextTCP(ctx, dst) |
| 139 | + } |
| 140 | + |
| 141 | + if err := ns.Start(nil /* no LocalBackend */); err != nil { |
| 142 | + return "", nil, fmt.Errorf("failed to start netstack: %w", err) |
| 143 | + } |
| 144 | + |
| 145 | + mc := sys.MagicSock.Get() |
| 146 | + log.Printf("disco pub key: %v", mc.DiscoPublicKey()) |
| 147 | + |
| 148 | + mc.SetPrivateKey(priv) |
| 149 | + e.SetDERPMap(&tailcfg.DERPMap{ |
| 150 | + Regions: map[int]*tailcfg.DERPRegion{ |
| 151 | + ci.Region.RegionID: ci.Region, |
| 152 | + }, |
| 153 | + }) |
| 154 | + mc.SetNetworkUp(true) |
| 155 | + |
| 156 | + return connBlob, sys, nil |
| 157 | +} |
| 158 | + |
| 159 | +func newNetstack(logf logger.Logf, sys *tsd.System) (*netstack.Impl, error) { |
| 160 | + return netstack.Create(logf, sys.Tun.Get(), sys.Engine.Get(), sys.MagicSock.Get(), sys.Dialer.Get(), sys.DNSManager.Get()) |
| 161 | +} |
| 162 | + |
| 163 | +// createEngine tries to the wgengine.Engine based on the order of tunnels |
| 164 | +// specified in the command line flags. |
| 165 | +// |
| 166 | +// onlyNetstack is true if the user has explicitly requested that we use netstack |
| 167 | +// for all networking. |
| 168 | +func createEngine(logf logger.Logf, sys *tsd.System) (err error) { |
| 169 | + conf := wgengine.Config{ |
| 170 | + ListenPort: 0, |
| 171 | + NetMon: sys.NetMon.Get(), |
| 172 | + Dialer: sys.Dialer.Get(), |
| 173 | + SetSubsystem: sys.Set, |
| 174 | + } |
| 175 | + netns.SetEnabled(false) |
| 176 | + e, err := wgengine.NewUserspaceEngine(logf, conf) |
| 177 | + if err != nil { |
| 178 | + logf("wgengine.NewUserspaceEngine(tun %q) error: %v", "userspace-networking", err) |
| 179 | + return err |
| 180 | + } |
| 181 | + e = wgengine.NewWatchdog(e) |
| 182 | + sys.Set(e) |
| 183 | + sys.NetstackRouter.Set(true) |
| 184 | + return nil |
| 185 | +} |
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