|
| 1 | +package cmd |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "crypto/tls" |
| 6 | + "errors" |
| 7 | + "fmt" |
| 8 | + "log" |
| 9 | + "net" |
| 10 | + "net/http" |
| 11 | + "net/netip" |
| 12 | + "os/signal" |
| 13 | + "strings" |
| 14 | + "syscall" |
| 15 | + "time" |
| 16 | + |
| 17 | + "github.com/spf13/cobra" |
| 18 | + "golang.zx2c4.com/wireguard/wgctrl" |
| 19 | + |
| 20 | + "github.com/modal-labs/vprox/lib" |
| 21 | +) |
| 22 | + |
| 23 | +const edgeHealthCheckInterval = 2 * time.Second |
| 24 | +const edgeHealthCheckTimeout = 5 * time.Second |
| 25 | +const edgeReconnectInterval = 2 * time.Second |
| 26 | + |
| 27 | +var EdgeCmd = &cobra.Command{ |
| 28 | + Use: "edge [flags] <server-ip>", |
| 29 | + Short: "Connect to a VPN server as an edge node, advertising local routes", |
| 30 | + Args: cobra.ExactArgs(1), |
| 31 | + ArgAliases: []string{"server-ip"}, |
| 32 | + RunE: runEdge, |
| 33 | +} |
| 34 | + |
| 35 | +var edgeCmdArgs struct { |
| 36 | + ifname string |
| 37 | + routes string |
| 38 | +} |
| 39 | + |
| 40 | +func init() { |
| 41 | + EdgeCmd.Flags().StringVar(&edgeCmdArgs.ifname, "interface", |
| 42 | + "vprox-edge0", "WireGuard interface name for the edge tunnel") |
| 43 | + EdgeCmd.Flags().StringVar(&edgeCmdArgs.routes, "routes", |
| 44 | + "", "Comma-separated CIDR prefixes to advertise (e.g. 10.0.5.0/24,172.16.0.0/12)") |
| 45 | +} |
| 46 | + |
| 47 | +func runEdge(cmd *cobra.Command, args []string) error { |
| 48 | + serverIp, err := netip.ParseAddr(args[0]) |
| 49 | + if err != nil || !serverIp.Is4() { |
| 50 | + return fmt.Errorf("invalid IPv4 address: %s", args[0]) |
| 51 | + } |
| 52 | + |
| 53 | + if edgeCmdArgs.routes == "" { |
| 54 | + return errors.New("missing required flag: --routes") |
| 55 | + } |
| 56 | + |
| 57 | + // Parse and validate routes. |
| 58 | + var routes []netip.Prefix |
| 59 | + for _, r := range strings.Split(edgeCmdArgs.routes, ",") { |
| 60 | + r = strings.TrimSpace(r) |
| 61 | + if r == "" { |
| 62 | + continue |
| 63 | + } |
| 64 | + prefix, err := netip.ParsePrefix(r) |
| 65 | + if err != nil { |
| 66 | + return fmt.Errorf("invalid route CIDR %q: %v", r, err) |
| 67 | + } |
| 68 | + if !prefix.Addr().Is4() { |
| 69 | + return fmt.Errorf("only IPv4 routes are supported: %q", r) |
| 70 | + } |
| 71 | + routes = append(routes, prefix.Masked()) |
| 72 | + } |
| 73 | + if len(routes) == 0 { |
| 74 | + return errors.New("at least one route must be specified with --routes") |
| 75 | + } |
| 76 | + |
| 77 | + key, err := lib.GetClientKey(edgeCmdArgs.ifname) |
| 78 | + if err != nil { |
| 79 | + return fmt.Errorf("failed to load edge key: %v", err) |
| 80 | + } |
| 81 | + |
| 82 | + token, err := lib.GetClientToken() |
| 83 | + if err != nil { |
| 84 | + return err |
| 85 | + } |
| 86 | + |
| 87 | + wgClient, err := wgctrl.New() |
| 88 | + if err != nil { |
| 89 | + return fmt.Errorf("failed to initialize wgctrl: %v", err) |
| 90 | + } |
| 91 | + |
| 92 | + edge := &lib.EdgeClient{ |
| 93 | + Key: key, |
| 94 | + Ifname: edgeCmdArgs.ifname, |
| 95 | + ServerIp: serverIp, |
| 96 | + Token: token, |
| 97 | + Routes: routes, |
| 98 | + WgClient: wgClient, |
| 99 | + Http: &http.Client{ |
| 100 | + Timeout: 5 * time.Second, |
| 101 | + Transport: &http.Transport{ |
| 102 | + TLSClientConfig: &tls.Config{InsecureSkipVerify: true}, |
| 103 | + DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) { |
| 104 | + return dialWithRetry(ctx, network, addr) |
| 105 | + }, |
| 106 | + }, |
| 107 | + }, |
| 108 | + } |
| 109 | + |
| 110 | + ctx, done := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM) |
| 111 | + defer done() |
| 112 | + |
| 113 | + if err := edge.CreateInterface(); err != nil { |
| 114 | + return err |
| 115 | + } |
| 116 | + defer edge.DeleteInterface() |
| 117 | + |
| 118 | + if err := edge.Connect(); err != nil { |
| 119 | + return err |
| 120 | + } |
| 121 | + defer func() { |
| 122 | + log.Println("Sending /edge-disconnect request to server.") |
| 123 | + if err := edge.Disconnect(); err != nil { |
| 124 | + log.Printf("warning: failed to disconnect from server: %v", err) |
| 125 | + } |
| 126 | + }() |
| 127 | + |
| 128 | + if err := edge.SetupForwarding(); err != nil { |
| 129 | + return fmt.Errorf("failed to set up forwarding: %v", err) |
| 130 | + } |
| 131 | + defer func() { |
| 132 | + if err := edge.CleanupForwarding(); err != nil { |
| 133 | + log.Printf("warning: failed to clean up forwarding rules: %v", err) |
| 134 | + } |
| 135 | + }() |
| 136 | + |
| 137 | + log.Printf("Edge connected, advertising routes: %v", routes) |
| 138 | + if !edge.CheckConnection(edgeHealthCheckTimeout, ctx) { |
| 139 | + return fmt.Errorf("edge connection failed initial healthcheck after %v", edgeHealthCheckTimeout) |
| 140 | + } |
| 141 | + |
| 142 | + for { |
| 143 | + select { |
| 144 | + case <-ctx.Done(): |
| 145 | + log.Println("Context done. Returning from runEdge.") |
| 146 | + return nil |
| 147 | + case <-time.After(edgeHealthCheckInterval): |
| 148 | + } |
| 149 | + |
| 150 | + if !edge.CheckConnection(edgeHealthCheckTimeout, ctx) { |
| 151 | + log.Println("Edge tunnel unhealthy. Attempting to reconnect...") |
| 152 | + unhealthy_loop: |
| 153 | + for { |
| 154 | + err = edge.Connect() |
| 155 | + if err == nil { |
| 156 | + log.Println("Edge reconnected.") |
| 157 | + break unhealthy_loop |
| 158 | + } |
| 159 | + if !lib.IsRecoverableError(err) { |
| 160 | + return fmt.Errorf("unrecoverable edge connection error: %w", err) |
| 161 | + } |
| 162 | + log.Printf("Failed to reconnect edge: %v", err) |
| 163 | + select { |
| 164 | + case <-ctx.Done(): |
| 165 | + log.Println("Context done during reconnect. Breaking out.") |
| 166 | + break unhealthy_loop |
| 167 | + case <-time.After(edgeReconnectInterval): |
| 168 | + } |
| 169 | + } |
| 170 | + } |
| 171 | + } |
| 172 | +} |
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