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package srvconn
import (
"errors"
"io"
"time"
gossh "golang.org/x/crypto/ssh"
"github.com/jumpserver/koko/pkg/model"
)
type ServerSSHConnection struct {
User *model.User
Asset *model.Asset
SystemUser *model.SystemUser
Overtime time.Duration
client *SSHClient
session *gossh.Session
stdin io.WriteCloser
stdout io.Reader
closed bool
connected bool
}
func (sc *ServerSSHConnection) Protocol() string {
return "ssh"
}
func (sc *ServerSSHConnection) Username() string {
return sc.client.Username
}
func (sc *ServerSSHConnection) invokeShell(h, w int, term string) (err error) {
sess, err := sc.client.Client.NewSession()
if err != nil {
return
}
sc.session = sess
modes := gossh.TerminalModes{
gossh.ECHO: 1, // enable echoing
gossh.TTY_OP_ISPEED: 14400, // input speed = 14.4 kbaud
gossh.TTY_OP_OSPEED: 14400, // output speed = 14.4 kbaud
}
err = sess.RequestPty(term, h, w, modes)
if err != nil {
return
}
sc.stdin, err = sess.StdinPipe()
if err != nil {
return
}
sc.stdout, err = sess.StdoutPipe()
if err != nil {
return
}
err = sess.Shell()
return err
}
func (sc *ServerSSHConnection) Connect(h, w int, term string) (err error) {
sc.client, err = NewClient(sc.User, sc.Asset, sc.SystemUser, sc.Timeout())
if err != nil {
return
}
err = sc.invokeShell(h, w, term)
if err != nil {
return
}
sc.connected = true
return nil
}
func (sc *ServerSSHConnection) TryConnectFromCache(h, w int, term string) (err error) {
sc.client = GetClientFromCache(sc.User, sc.Asset, sc.SystemUser)
if sc.client == nil {
return errors.New("no client in cache")
}
err = sc.invokeShell(h, w, term)
if err != nil {
RecycleClient(sc.client)
return
}
sc.connected = true
return nil
}
func (sc *ServerSSHConnection) SetWinSize(h, w int) error {
return sc.session.WindowChange(h, w)
}
func (sc *ServerSSHConnection) Read(p []byte) (n int, err error) {
return sc.stdout.Read(p)
}
func (sc *ServerSSHConnection) Write(p []byte) (n int, err error) {
return sc.stdin.Write(p)
}
func (sc *ServerSSHConnection) Timeout() time.Duration {
if sc.Overtime == 0 {
sc.Overtime = 30 * time.Second
}
return sc.Overtime
}
func (sc *ServerSSHConnection) Close() (err error) {
RecycleClient(sc.client)
if sc.closed || !sc.connected {
return
}
err = sc.session.Close()
if err != nil {
return
}
return
}