Golang code-google-com-p-go-crypto-ssh.Session类(方法)实例源码

func (c *SSHConn) ExecPath(cmd, path string) (out []byte, err error) {
	var session *ssh.Session

	session, err = c.client.NewSession()
	if err != nil {
		log.Fatal("Failed to create session: " + err.Error())
	}
	defer session.Close()

	envVars := ""
	if c.env != nil {
		for name, value := range c.env {
			envVars = envVars + name + "=\"" + value + "\" "
			/*
				      TODO: This should be the proper way to set the environment, but fails for some reason
							       * Investigate why and possibly send pull-request to maintainer
										err = session.Setenv(name, value)

										if err != nil {
											log.Fatal("Failed to set environment: " + err.Error())
										}
			*/
		}
	}

	cmd = envVars + cmd

	if path != "" {
		cmd = "cd " + path + " && " + cmd
	}

	return session.CombinedOutput(cmd)
}

/*
	Expected to be invoked as a goroutine which runs in parallel to sending the ssh command to the
	far side. This function reads from the input buffer reader br and writes to the target stripping
	blank and comment lines as it goes.
*/
func send_script(sess *ssh.Session, argv0 string, env_file string, br *bufio.Reader) {

	target, err := sess.StdinPipe() // we create the pipe here so that we can close here
	if err != nil {
		fmt.Fprintf(os.Stderr, "unable to create stdin for session: %s\n", err)
		return
	}
	defer target.Close()

	if argv0 != "" {
		target.Write([]byte("ARGV0=\"" + argv0 + "\"\n")) // $0 isn't valid using this, so simulate $0 with argv0
	}

	if env_file != "" { // must push out the environment first
		env_file, err = find_file(env_file) // find it in the path if not a qualified name
		if err == nil {
			ef, err := os.Open(env_file)

			if err != nil {
				fmt.Fprintf(os.Stderr, "ssh_broker: could not open environment file: %s: %s\n", env_file, err)
			} else {
				ebr := bufio.NewReader(ef) // get a buffered reader for the file
				send_file(ebr, target)
				ef.Close()
			}
		} else {
			fmt.Fprintf(os.Stderr, "ssh_broker: could not find  environment file: %s: %s\n", env_file, err)
		}
	}

	send_file(br, target)
}

// RequestAgentForwarding sets up agent forwarding for the session.
// ForwardToAgent or ForwardToRemote should be called to route
// the authentication requests.
func RequestAgentForwarding(session *ssh.Session) error {
	ok, err := session.SendRequest("[email protected]", true, nil)
	if err != nil {
		return err
	}
	if !ok {
		return errors.New("forwarding request denied")
	}
	return nil
}

func (sshTransport *SSHTransport) execCmd(session *ssh.Session, cmd string) (*bytes.Buffer, error) {
	var b bytes.Buffer
	modes := ssh.TerminalModes{
		ECHO:          0,
		TTY_OP_ISPEED: 14400,
		TTY_OP_OSPEED: 14400,
	}
	if err := session.RequestPty("xterm", 80, 40, modes); err != nil {
		log.Fatalf("request for pseudo terminal failed: " + err.Error())
	}
	session.Stdout = &b
	if err := session.Run(cmd); err != nil {
		return nil, fmt.Errorf(b.String())
	}
	return &b, nil
}

func (config *Config) executeCommand(s *ssh.Session, cmd string, sudo bool) ([]byte, error) {
	if s.Stdout != nil {
		return nil, errors.New("ssh: Stdout already set")
	}
	if s.Stderr != nil {
		return nil, errors.New("ssh: Stderr already set")
	}

	b := newSingleWriterReader()
	s.Stdout = &b
	s.Stderr = &b
	done := make(chan bool)

	if sudo {
		stdInWriter, err := s.StdinPipe()
		if err != nil {
			if config.AbortOnError == true {
				log.Fatalf("%s", err)
			}
			return nil, err
		}

		go config.injectSudoPasswordIfNecessary(done, &b, stdInWriter)
	}

	err := s.Run(cmd)
	close(done)
	return b.Bytes(), err
}

func remoteStandardio(
	s *ssh.Session) (io.WriteCloser, io.Reader, io.Reader, string) {

	var stdin io.WriteCloser
	var stdout io.Reader
	var stderr io.Reader
	var err error

	// plumb into standard input
	if stdin, err = s.StdinPipe(); err != nil {
		return nil, nil, nil, fmt.Sprintf("Error: %v\n", err)
	}
	// plumb into standard output
	if stdout, err = s.StdoutPipe(); err != nil {
		return nil, nil, nil, fmt.Sprintf("Error: %v\n", err)
	}
	// plumb into standard error
	if stderr, err = s.StderrPipe(); err != nil {
		return nil, nil, nil, fmt.Sprintf("Error: %v\n", err)
	}
	return stdin, stdout, stderr, ""
}