Files
netbird/client/ssh/client/terminal_unix.go
2025-11-17 17:10:41 +01:00

128 lines
2.5 KiB
Go

//go:build !windows
package client
import (
"context"
"fmt"
"os"
"os/signal"
"syscall"
log "github.com/sirupsen/logrus"
"golang.org/x/crypto/ssh"
"golang.org/x/term"
)
func (c *Client) setupTerminalMode(ctx context.Context, session *ssh.Session) error {
stdinFd := int(os.Stdin.Fd())
if !term.IsTerminal(stdinFd) {
return c.setupNonTerminalMode(ctx, session)
}
fd := int(os.Stdin.Fd())
state, err := term.MakeRaw(fd)
if err != nil {
return c.setupNonTerminalMode(ctx, session)
}
if err := c.setupTerminal(session, fd); err != nil {
if restoreErr := term.Restore(fd, state); restoreErr != nil {
log.Debugf("restore terminal state: %v", restoreErr)
}
return err
}
c.terminalState = state
c.terminalFd = fd
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
go func() {
defer signal.Stop(sigChan)
select {
case <-ctx.Done():
if err := term.Restore(fd, state); err != nil {
log.Debugf("restore terminal state: %v", err)
}
case sig := <-sigChan:
if err := term.Restore(fd, state); err != nil {
log.Debugf("restore terminal state: %v", err)
}
signal.Reset(sig)
s, ok := sig.(syscall.Signal)
if !ok {
log.Debugf("signal %v is not a syscall.Signal: %T", sig, sig)
return
}
if err := syscall.Kill(syscall.Getpid(), s); err != nil {
log.Debugf("kill process with signal %v: %v", s, err)
}
}
}()
return nil
}
func (c *Client) setupNonTerminalMode(_ context.Context, session *ssh.Session) error {
return nil
}
// restoreWindowsConsoleState is a no-op on Unix systems
func (c *Client) restoreWindowsConsoleState() error {
return nil
}
func (c *Client) setupTerminal(session *ssh.Session, fd int) error {
w, h, err := term.GetSize(fd)
if err != nil {
return fmt.Errorf("get terminal size: %w", err)
}
modes := ssh.TerminalModes{
ssh.ECHO: 1,
ssh.TTY_OP_ISPEED: 14400,
ssh.TTY_OP_OSPEED: 14400,
// Ctrl+C
ssh.VINTR: 3,
// Ctrl+\
ssh.VQUIT: 28,
// Backspace
ssh.VERASE: 127,
// Ctrl+U
ssh.VKILL: 21,
// Ctrl+D
ssh.VEOF: 4,
ssh.VEOL: 0,
ssh.VEOL2: 0,
// Ctrl+Q
ssh.VSTART: 17,
// Ctrl+S
ssh.VSTOP: 19,
// Ctrl+Z
ssh.VSUSP: 26,
// Ctrl+O
ssh.VDISCARD: 15,
// Ctrl+R
ssh.VREPRINT: 18,
// Ctrl+W
ssh.VWERASE: 23,
// Ctrl+V
ssh.VLNEXT: 22,
}
terminal := os.Getenv("TERM")
if terminal == "" {
terminal = "xterm-256color"
}
if err := session.RequestPty(terminal, h, w, modes); err != nil {
return fmt.Errorf("request pty: %w", err)
}
return nil
}