mirror of https://github.com/coder/coder.git
128 lines
3.3 KiB
Go
128 lines
3.3 KiB
Go
//go:build !windows
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package pty
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import (
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"log"
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"github.com/gliderlabs/ssh"
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"github.com/u-root/u-root/pkg/termios"
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gossh "golang.org/x/crypto/ssh"
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"golang.org/x/xerrors"
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)
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// terminalModeFlagNames maps the SSH terminal mode flags to mnemonic
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// names used by the termios package.
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var terminalModeFlagNames = map[uint8]string{
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gossh.VINTR: "intr",
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gossh.VQUIT: "quit",
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gossh.VERASE: "erase",
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gossh.VKILL: "kill",
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gossh.VEOF: "eof",
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gossh.VEOL: "eol",
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gossh.VEOL2: "eol2",
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gossh.VSTART: "start",
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gossh.VSTOP: "stop",
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gossh.VSUSP: "susp",
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gossh.VDSUSP: "dsusp",
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gossh.VREPRINT: "rprnt",
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gossh.VWERASE: "werase",
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gossh.VLNEXT: "lnext",
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gossh.VFLUSH: "flush",
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gossh.VSWTCH: "swtch",
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gossh.VSTATUS: "status",
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gossh.VDISCARD: "discard",
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gossh.IGNPAR: "ignpar",
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gossh.PARMRK: "parmrk",
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gossh.INPCK: "inpck",
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gossh.ISTRIP: "istrip",
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gossh.INLCR: "inlcr",
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gossh.IGNCR: "igncr",
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gossh.ICRNL: "icrnl",
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gossh.IUCLC: "iuclc",
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gossh.IXON: "ixon",
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gossh.IXANY: "ixany",
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gossh.IXOFF: "ixoff",
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gossh.IMAXBEL: "imaxbel",
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gossh.IUTF8: "iutf8",
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gossh.ISIG: "isig",
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gossh.ICANON: "icanon",
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gossh.XCASE: "xcase",
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gossh.ECHO: "echo",
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gossh.ECHOE: "echoe",
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gossh.ECHOK: "echok",
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gossh.ECHONL: "echonl",
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gossh.NOFLSH: "noflsh",
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gossh.TOSTOP: "tostop",
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gossh.IEXTEN: "iexten",
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gossh.ECHOCTL: "echoctl",
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gossh.ECHOKE: "echoke",
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gossh.PENDIN: "pendin",
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gossh.OPOST: "opost",
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gossh.OLCUC: "olcuc",
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gossh.ONLCR: "onlcr",
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gossh.OCRNL: "ocrnl",
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gossh.ONOCR: "onocr",
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gossh.ONLRET: "onlret",
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gossh.CS7: "cs7",
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gossh.CS8: "cs8",
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gossh.PARENB: "parenb",
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gossh.PARODD: "parodd",
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gossh.TTY_OP_ISPEED: "tty_op_ispeed",
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gossh.TTY_OP_OSPEED: "tty_op_ospeed",
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}
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// applyTerminalModesToFd applies the terminal settings from the SSH
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// request to the given fd.
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//
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// This is based on code from Tailscale's tailssh package:
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// https://github.com/tailscale/tailscale/blob/main/ssh/tailssh/incubator.go
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func applyTerminalModesToFd(logger *log.Logger, fd uintptr, req ssh.Pty) error {
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// Get the current TTY configuration.
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tios, err := termios.GTTY(int(fd))
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if err != nil {
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return xerrors.Errorf("GTTY: %w", err)
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}
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// Apply the modes from the SSH request.
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tios.Row = req.Window.Height
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tios.Col = req.Window.Width
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for c, v := range req.Modes {
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if c == gossh.TTY_OP_ISPEED {
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tios.Ispeed = int(v)
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continue
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}
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if c == gossh.TTY_OP_OSPEED {
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tios.Ospeed = int(v)
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continue
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}
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k, ok := terminalModeFlagNames[c]
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if !ok {
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if logger != nil {
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logger.Printf("unknown terminal mode: %d", c)
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}
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continue
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}
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if _, ok := tios.CC[k]; ok {
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tios.CC[k] = uint8(v)
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continue
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}
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if _, ok := tios.Opts[k]; ok {
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tios.Opts[k] = v > 0
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continue
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}
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if logger != nil {
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logger.Printf("unsupported terminal mode: k=%s, c=%d, v=%d", k, c, v)
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}
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}
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// Save the new TTY configuration.
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if _, err := tios.STTY(int(fd)); err != nil {
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return xerrors.Errorf("STTY: %w", err)
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}
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return nil
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}
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