applyTerminalModesToFd applies the terminal settings from the SSH request to the given fd. This is based on code from Tailscale's tailssh package: https://github.com/tailscale/tailscale/blob/main/ssh/tailssh/incubator.go
(logger *log.Logger, fd uintptr, req ssh.Pty)
| 78 | // This is based on code from Tailscale's tailssh package: |
| 79 | // https://github.com/tailscale/tailscale/blob/main/ssh/tailssh/incubator.go |
| 80 | func applyTerminalModesToFd(logger *log.Logger, fd uintptr, req ssh.Pty) error { |
| 81 | // Get the current TTY configuration. |
| 82 | tios, err := termios.GTTY(int(fd)) |
| 83 | if err != nil { |
| 84 | return xerrors.Errorf("GTTY: %w", err) |
| 85 | } |
| 86 | |
| 87 | // Apply the modes from the SSH request. |
| 88 | tios.Row = req.Window.Height |
| 89 | tios.Col = req.Window.Width |
| 90 | |
| 91 | for c, v := range req.Modes { |
| 92 | if c == gossh.TTY_OP_ISPEED { |
| 93 | tios.Ispeed = int(v) |
| 94 | continue |
| 95 | } |
| 96 | if c == gossh.TTY_OP_OSPEED { |
| 97 | tios.Ospeed = int(v) |
| 98 | continue |
| 99 | } |
| 100 | k, ok := terminalModeFlagNames[c] |
| 101 | if !ok { |
| 102 | if logger != nil { |
| 103 | logger.Printf("unknown terminal mode: %d", c) |
| 104 | } |
| 105 | continue |
| 106 | } |
| 107 | if _, ok := tios.CC[k]; ok { |
| 108 | // #nosec G115 - Safe conversion for terminal control characters which are all in the uint8 range |
| 109 | tios.CC[k] = uint8(v) |
| 110 | continue |
| 111 | } |
| 112 | if _, ok := tios.Opts[k]; ok { |
| 113 | tios.Opts[k] = v > 0 |
| 114 | continue |
| 115 | } |
| 116 | |
| 117 | if logger != nil { |
| 118 | logger.Printf("unsupported terminal mode: k=%s, c=%d, v=%d", k, c, v) |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | // Save the new TTY configuration. |
| 123 | if _, err := tios.STTY(int(fd)); err != nil { |
| 124 | return xerrors.Errorf("STTY: %w", err) |
| 125 | } |
| 126 | |
| 127 | return nil |
| 128 | } |