253 lines
7.7 KiB
C
253 lines
7.7 KiB
C
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is libguac-client-ssh.
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*
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* The Initial Developer of the Original Code is
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* Michael Jumper.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* James Muehlner <dagger10k@users.sourceforge.net>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include <stdio.h>
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#include <string.h>
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#include <pthread.h>
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#include <guacamole/client.h>
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#include <guacamole/protocol.h>
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#include <guacamole/socket.h>
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#include "client.h"
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#include "common.h"
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/**
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* Reads a single line from STDIN.
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*/
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static char* prompt(guac_client* client, const char* title, char* str, int size, bool echo) {
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ssh_guac_client_data* client_data = (ssh_guac_client_data*) client->data;
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int pos;
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char in_byte;
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/* Get STDIN and STDOUT */
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int stdin_fd = client_data->term->stdin_pipe_fd[0];
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int stdout_fd = client_data->term->stdout_pipe_fd[1];
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/* Print title */
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guac_terminal_write_all(stdout_fd, title, strlen(title));
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/* Make room for null terminator */
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size--;
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/* Read bytes until newline */
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pos = 0;
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while (pos < size && read(stdin_fd, &in_byte, 1) == 1) {
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/* Backspace */
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if (in_byte == 0x08) {
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if (pos > 0) {
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guac_terminal_write_all(stdout_fd, "\b \b", 3);
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pos--;
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}
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}
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/* Newline (end of input */
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else if (in_byte == 0x0A) {
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guac_terminal_write_all(stdout_fd, "\r\n", 2);
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break;
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}
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else {
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/* Store character, update buffers */
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str[pos++] = in_byte;
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/* Print character if echoing */
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if (echo)
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guac_terminal_write_all(stdout_fd, &in_byte, 1);
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else
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guac_terminal_write_all(stdout_fd, "*", 1);
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}
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}
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str[pos] = 0;
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return str;
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}
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void* ssh_input_thread(void* data) {
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guac_client* client = (guac_client*) data;
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ssh_guac_client_data* client_data = (ssh_guac_client_data*) client->data;
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char buffer[8192];
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int bytes_read;
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int stdin_fd = client_data->term->stdin_pipe_fd[0];
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/* Write all data read */
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while ((bytes_read = read(stdin_fd, buffer, sizeof(buffer))) > 0)
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channel_write(client_data->term_channel, buffer, bytes_read);
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return NULL;
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}
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void* ssh_client_thread(void* data) {
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guac_client* client = (guac_client*) data;
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ssh_guac_client_data* client_data = (ssh_guac_client_data*) client->data;
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guac_socket* socket = client->socket;
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char buffer[8192];
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int bytes_read = -1234;
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int stdout_fd = client_data->term->stdout_pipe_fd[1];
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pthread_t input_thread;
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/* Get username */
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if (client_data->username[0] == 0 &&
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prompt(client, "Login as: ", client_data->username, sizeof(client_data->username), true) == NULL)
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return NULL;
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/* Get password */
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if (client_data->password[0] == 0 &&
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prompt(client, "Password: ", client_data->password, sizeof(client_data->password), false) == NULL)
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return NULL;
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/* Clear screen */
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guac_terminal_write_all(stdout_fd, "\x1B[H\x1B[J", 6);
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/* Open SSH session */
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client_data->session = ssh_new();
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if (client_data->session == NULL) {
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guac_protocol_send_error(socket, "Unable to create SSH session.");
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guac_socket_flush(socket);
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return NULL;
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}
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/* Set session options */
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ssh_options_set(client_data->session, SSH_OPTIONS_HOST, client_data->hostname);
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ssh_options_set(client_data->session, SSH_OPTIONS_USER, client_data->username);
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/* Connect */
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if (ssh_connect(client_data->session) != SSH_OK) {
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guac_protocol_send_error(socket, "Unable to connect via SSH.");
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guac_socket_flush(socket);
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return NULL;
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}
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/* Authenticate */
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if (ssh_userauth_password(client_data->session, NULL, client_data->password) != SSH_AUTH_SUCCESS) {
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guac_protocol_send_error(socket, "SSH auth failed.");
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guac_socket_flush(socket);
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return NULL;
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}
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/* Open channel for terminal */
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client_data->term_channel = channel_new(client_data->session);
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if (client_data->term_channel == NULL) {
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guac_protocol_send_error(socket, "Unable to open channel.");
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guac_socket_flush(socket);
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return NULL;
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}
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/* Open session for channel */
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if (channel_open_session(client_data->term_channel) != SSH_OK) {
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guac_protocol_send_error(socket, "Unable to open channel session.");
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guac_socket_flush(socket);
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return NULL;
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}
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/* Request PTY */
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if (channel_request_pty(client_data->term_channel) != SSH_OK) {
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guac_protocol_send_error(socket, "Unable to allocate PTY for channel.");
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guac_socket_flush(socket);
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return NULL;
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}
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/* Request PTY size */
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if (channel_change_pty_size(client_data->term_channel,
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client_data->term->term_width, client_data->term->term_height) != SSH_OK) {
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guac_protocol_send_error(socket, "Unable to change PTY size.");
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guac_socket_flush(socket);
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return NULL;
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}
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/* Request shell */
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if (channel_request_shell(client_data->term_channel) != SSH_OK) {
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guac_protocol_send_error(socket, "Unable to associate shell with PTY.");
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guac_socket_flush(socket);
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return NULL;
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}
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/* Logged in */
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guac_client_log_info(client, "SSH connection successful.");
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/* Start input thread */
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if (pthread_create(&(input_thread), NULL, ssh_input_thread, (void*) client)) {
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guac_client_log_error(client, "Unable to start SSH input thread");
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return NULL;
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}
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/* While data available, write to terminal */
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while (channel_is_open(client_data->term_channel)
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&& !channel_is_eof(client_data->term_channel)) {
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/* Repeat read if necessary */
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if ((bytes_read = channel_read(client_data->term_channel, buffer, sizeof(buffer), 0)) == SSH_AGAIN)
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continue;
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if (bytes_read > 0)
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guac_terminal_write_all(stdout_fd, buffer, bytes_read);
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}
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/* Notify on error */
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if (bytes_read < 0) {
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guac_protocol_send_error(socket, "Error reading data.");
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guac_socket_flush(socket);
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return NULL;
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}
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/* Wait for input thread to die */
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pthread_join(input_thread, NULL);
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guac_client_log_info(client, "SSH connection ended.");
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return NULL;
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}
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