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ssh_client.go
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ssh_client.go
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package ssh
import (
"context"
"io"
"os"
"os/signal"
"time"
"github.com/libp2p/go-libp2p-core/host"
"github.com/libp2p/go-libp2p-core/peer"
"github.com/wanyvic/ssh"
)
type SSHClient struct {
host host.Host
ClientConfig ssh.ClientConfig
Stdout io.Writer
Stderr io.Writer
Stdin io.Reader
}
//NewSSHClientWithConfig Create a new ssh client with config
func NewSSHClientWithConfig(h host.Host, config ssh.ClientConfig) *SSHClient {
sc := &SSHClient{h, config, nil, nil, nil}
return sc
}
//Connect connect to ssh server
func (sc *SSHClient) Connect(p peer.ID) error {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
stream, err := sc.host.NewStream(ctx, p, ID)
if err != nil {
return err
}
defer stream.Close()
c, chans, reqs, err := ssh.NewClientConn(stream, p.String(), &sc.ClientConfig)
if err != nil {
return err
}
client := ssh.NewClient(c, chans, reqs)
defer client.Close()
// create session
session, err := client.NewSession()
if err != nil {
}
defer session.Close()
// excute command
session.Stdout = sc.Stdout
session.Stderr = sc.Stderr
w, err := session.StdinPipe()
if err != nil {
return err
}
go io.Copy(w, sc.Stdin)
// Notify os.Interrupt
signalChan := make(chan os.Signal, 1)
signal.Notify(signalChan, os.Interrupt)
go func(ctx context.Context) {
for {
select {
case <-ctx.Done():
signal.Stop(signalChan)
return
case <-signalChan:
w.Write([]byte{3})
}
}
}(ctx)
// Set up terminal width, height
width, height, err := getTerminalSize()
if err != nil {
return err
}
// Set up terminal modes
modes := ssh.TerminalModes{
ssh.ECHO: 1, // enable echoing
ssh.TTY_OP_ISPEED: 14400, // input speed = 14.4kbaud
ssh.TTY_OP_OSPEED: 14400, // output speed = 14.4kbaud
}
// Request pseudo terminal
if err := session.RequestPty("xterm-256color", height, width, modes); err != nil {
return err
}
// change window size
go windowChange(ctx, session)
// no buffering
setTerminalEcho(true)
defer setTerminalEcho(false)
if err = session.Shell(); err != nil {
return err
}
session.Wait()
return nil
}
// windowChange change window size when the terminal resize
func windowChange(ctx context.Context, session *ssh.Session) {
width, height, err := getTerminalSize()
if err != nil {
return
}
for {
select {
case <-ctx.Done():
return
case <-time.After(time.Millisecond):
w, h, _ := getTerminalSize()
if w != width || h != height {
session.WindowChange(h, w)
width = w
height = h
}
}
}
}