| 1 | package agent |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "fmt" |
| 7 | "net" |
| 8 | "net/http" |
| 9 | "os" |
| 10 | "path/filepath" |
| 11 | "strings" |
| 12 | "time" |
| 13 | |
| 14 | "github.com/rs/zerolog/log" |
| 15 | |
| 16 | "github.com/gosuda/portal-tunnel/v2/portal/auth" |
| 17 | "github.com/gosuda/portal-tunnel/v2/utils" |
| 18 | ) |
| 19 | |
| 20 | func Run(ctx context.Context, cfg Config) error { |
| 21 | endpointStateDir := strings.TrimSpace(cfg.Agent.StateDir) |
| 22 | if endpointStateDir == "" { |
| 23 | return errors.New("agent.state_dir is required") |
| 24 | } |
| 25 | if err := os.MkdirAll(endpointStateDir, 0o700); err != nil { |
| 26 | return err |
| 27 | } |
| 28 | token := utils.RandomID("agent_") |
| 29 | |
| 30 | runtimeCtx, cancel := context.WithCancel(ctx) |
| 31 | defer cancel() |
| 32 | |
| 33 | manager := newManager(cfg, "") |
| 34 | walletAuth, err := auth.NewWalletAuthenticator(auth.WalletAuthConfig{ |
| 35 | AllowedAddresses: cfg.Agent.AllowedWallets, |
| 36 | AllowAnyAddress: len(cfg.Agent.AllowedWallets) == 0, |
| 37 | Statement: "Sign in to Portal agent", |
| 38 | }) |
| 39 | if err != nil { |
| 40 | return err |
| 41 | } |
| 42 | controlAddr := strings.TrimSpace(cfg.Agent.ControlAddr) |
| 43 | if controlAddr == "" { |
| 44 | return errors.New("control address is required") |
| 45 | } |
| 46 | host, _, err := net.SplitHostPort(controlAddr) |
| 47 | if err != nil { |
| 48 | return fmt.Errorf("control address must be host:port: %w", err) |
| 49 | } |
| 50 | host = strings.Trim(host, "[]") |
| 51 | if host == "" { |
| 52 | return errors.New("control address must include a loopback host") |
| 53 | } |
| 54 | if !strings.EqualFold(host, "localhost") { |
| 55 | ip := net.ParseIP(host) |
| 56 | if ip == nil || !ip.IsLoopback() { |
| 57 | return fmt.Errorf("control address must bind to loopback, got %q", host) |
| 58 | } |
| 59 | } |
| 60 | var listenConfig net.ListenConfig |
| 61 | listener, err := listenConfig.Listen(runtimeCtx, "tcp", controlAddr) |
| 62 | if err != nil { |
| 63 | return err |
| 64 | } |
| 65 | control := &http.Server{ |
| 66 | Handler: &controlHandler{ |
| 67 | manager: manager, |
| 68 | token: token, |
| 69 | auth: walletAuth, |
| 70 | shutdown: cancel, |
| 71 | }, |
| 72 | ReadHeaderTimeout: 5 * time.Second, |
| 73 | } |
| 74 | listenAddr := listener.Addr().String() |
| 75 | manager.controlAddr = listenAddr |
| 76 | |
| 77 | if err := utils.WriteJSONFile(filepath.Join(endpointStateDir, endpointFilename), endpoint{ |
| 78 | ControlAddr: listenAddr, |
| 79 | Token: token, |
| 80 | }, 0o600); err != nil { |
| 81 | _ = listener.Close() |
| 82 | _ = control.Shutdown(context.Background()) |
| 83 | return err |
| 84 | } |
| 85 | defer func() { |
| 86 | _ = os.Remove(filepath.Join(endpointStateDir, endpointFilename)) |
| 87 | }() |
| 88 | |
| 89 | manager.Start(runtimeCtx) |
| 90 | |
| 91 | errCh := make(chan error, 1) |
| 92 | go func() { |
| 93 | err := control.Serve(listener) |
| 94 | if errors.Is(err, http.ErrServerClosed) || errors.Is(err, net.ErrClosed) { |
| 95 | err = nil |
| 96 | } |
| 97 | errCh <- err |
| 98 | }() |
| 99 | |
| 100 | log.Info(). |
| 101 | Str("control_addr", listenAddr). |
| 102 | Int("tunnel_count", len(cfg.Tunnels)). |
| 103 | Msg("portal agent started") |
| 104 | |
| 105 | var serveErr error |
| 106 | select { |
| 107 | case <-runtimeCtx.Done(): |
| 108 | case serveErr = <-errCh: |
| 109 | cancel() |
| 110 | } |
| 111 | |
| 112 | shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 15*time.Second) |
| 113 | defer shutdownCancel() |
| 114 | stopErr := manager.Stop(shutdownCtx) |
| 115 | closeErr := control.Shutdown(shutdownCtx) |
| 116 | if serveErr == nil { |
| 117 | select { |
| 118 | case serveErr = <-errCh: |
| 119 | default: |
| 120 | } |
| 121 | } |
| 122 | if errors.Is(serveErr, context.Canceled) { |
| 123 | serveErr = nil |
| 124 | } |
| 125 | log.Info().Msg("portal agent stopped") |
| 126 | return errors.Join(serveErr, stopErr, closeErr) |
| 127 | } |