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remote_shell.go
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remote_shell.go
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package sshc
import (
"os"
"sync"
"time"
"golang.org/x/crypto/ssh"
"golang.org/x/term"
)
// RemoteShell handles remote shell connections. It uses an ssh connection object
// and requests a shell inside a pty to the remote server
type RemoteShell struct {
sshConn *SshConnection
session *ssh.Session
sessMU sync.Mutex
stopCh chan bool
}
// NewRemoteShell creates a new RemoteShell object
func NewRemoteShell(sshConn *SshConnection) *RemoteShell {
rs := &RemoteShell{
sshConn: sshConn,
stopCh: make(chan bool, 1),
}
return rs
}
// Start starts the remote shell
func (rs *RemoteShell) Start(cmd string, requestPty bool) error {
rs.sshConn.ReadyWait()
session, err := rs.sshConn.Client.NewSession()
if err != nil {
log.Fatalf("Failed to create session: " + err.Error())
return err
}
rs.sessMU.Lock()
rs.session = session
rs.sessMU.Unlock()
defer session.Close()
session.Stdout = os.Stdout
session.Stderr = os.Stderr
session.Stdin = os.Stdin
fd := int(os.Stdin.Fd())
if term.IsTerminal(fd) && requestPty {
state, err := term.MakeRaw(fd)
if err != nil {
log.Printf("terminal make raw: %s", err)
}
defer term.Restore(fd, state)
// terminal size poller
go func() {
for {
select {
case <-time.After(100 * time.Millisecond):
w, h, _ := term.GetSize(fd)
session.WindowChange(h, w)
case <-rs.stopCh:
return
}
}
}()
w, h, err := term.GetSize(fd)
if err != nil {
log.Printf("terminal get size: %s", err)
}
// Set up terminal modes
modes := ssh.TerminalModes{
ssh.ECHO: 1,
ssh.TTY_OP_ISPEED: 14400,
ssh.TTY_OP_OSPEED: 14400,
}
terminal := os.Getenv("TERM")
if terminal == "" {
terminal = "xterm-256color"
}
// Request pseudo terminal
if err := session.RequestPty(terminal, h, w, modes); err != nil {
log.Fatalf("request for pseudo terminal failed: %s", err)
return err
}
}
if cmd == "" {
// Start remote shell
if err := session.Shell(); err != nil {
log.Fatalf("failed to start shell: %s", err)
return err
}
session.Wait()
} else {
// run the cmd
return session.Run(cmd)
}
return nil
}
// Stop stops the remote shell
func (rs *RemoteShell) Stop() {
rs.stopCh <- true
}