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ssh.go
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ssh.go
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package router
import (
"encoding/json"
"fmt"
"io"
"net"
"github.com/n-creativesystem/go-fwncs"
"golang.org/x/crypto/ssh"
"golang.org/x/net/websocket"
)
const END_OF_TRANSMISSION = "\u0004"
type terminalMessage struct {
Op, Data, SessionID string
Rows, Cols int
}
type consoleReader struct {
dst io.ReadCloser
log fwncs.ILogger
session *ssh.Session
}
func (w *consoleReader) Read(p []byte) (int, error) {
n, err := w.dst.Read(p)
if err != nil {
w.log.Error(err)
return copy(p, END_OF_TRANSMISSION), err
}
if n > 0 {
var msg terminalMessage
if err := json.Unmarshal(p[:n], &msg); err != nil {
w.log.Error(err)
return copy(p, END_OF_TRANSMISSION), err
}
w.log.Info(fmt.Sprintf("%v", msg))
switch msg.Op {
case "stdin":
w.log.Info(fmt.Sprintf("stdin: %s", msg.Data))
return copy(p, []byte(msg.Data)), nil
case "resize":
w.log.Info(fmt.Sprintf("resize h: %d w: %d", msg.Rows, msg.Cols))
if err := w.session.WindowChange(msg.Rows, msg.Cols); err != nil {
w.log.Error(err)
return copy(p, []byte(END_OF_TRANSMISSION)), err
}
return 0, nil
default:
return copy(p, []byte(END_OF_TRANSMISSION)), fmt.Errorf("unknown message tyoe '%s'", msg.Op)
}
}
return 0, nil
}
func (w *consoleReader) Close() error {
return w.dst.Close()
}
var _ io.ReadCloser = (*consoleReader)(nil)
func wrapReadCloser(dst io.ReadCloser, log fwncs.ILogger, session *ssh.Session) io.ReadCloser {
return &consoleReader{dst: dst, log: log, session: session}
}
type consoleWriter struct {
dst io.WriteCloser
log fwncs.ILogger
}
func (w *consoleWriter) Write(p []byte) (n int, err error) {
n, err = w.dst.Write(p)
if n > 0 {
w.log.Info(string(p[:n]))
}
return
}
func (w *consoleWriter) Close() error {
return w.dst.Close()
}
var _ io.WriteCloser = (*consoleWriter)(nil)
func wrapWriteCloser(dst io.WriteCloser, log fwncs.ILogger) io.WriteCloser {
return &consoleWriter{dst: dst, log: log}
}
func handlerSSH(c fwncs.Context) {
host := c.QueryParam("host")
port := c.QueryParam("port")
websocket.Handler(func(ws *websocket.Conn) {
defer ws.Close()
sshConfig := &ssh.ClientConfig{
User: "kube",
Auth: []ssh.AuthMethod{
ssh.Password("kube"),
},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
client, err := ssh.Dial("tcp", net.JoinHostPort(host, port), sshConfig)
if err != nil {
c.Logger().Error(err)
return
}
defer client.Close()
session, err := client.NewSession()
if err != nil {
c.Logger().Error(err)
return
}
defer session.Close()
termmodes := ssh.TerminalModes{
ssh.ECHO: 1,
ssh.TTY_OP_ISPEED: 14400,
ssh.TTY_OP_OSPEED: 14400,
}
if err := session.RequestPty("xterm-256color", 80, 120, termmodes); err != nil {
c.Logger().Error(err)
return
}
combinedOut := wrapWriteCloser(ws, c.Logger())
session.Stdout = combinedOut
session.Stderr = combinedOut
session.Stdin = wrapReadCloser(ws, c.Logger(), session)
if err := session.Shell(); nil != err {
c.Logger().Error(err)
return
}
if err := session.Wait(); nil != err {
c.Logger().Error(err)
}
}).ServeHTTP(c.Writer(), c.Request())
}