333 lines
11 KiB
C
333 lines
11 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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*
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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 <stdlib.h>
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#include <string.h>
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#include <cairo/cairo.h>
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#include <pango/pangocairo.h>
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#include <guacamole/log.h>
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#include <guacamole/guacio.h>
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#include <guacamole/protocol.h>
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#include <guacamole/client.h>
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#include "ssh_terminal.h"
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#include "ssh_terminal_handlers.h"
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int ssh_guac_terminal_echo(ssh_guac_terminal* term, char c) {
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GUACIO* io = term->client->io;
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/* Wrap if necessary */
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if (term->cursor_col >= term->term_width) {
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term->cursor_col = 0;
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term->cursor_row++;
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}
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/* Scroll up if necessary */
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if (term->cursor_row >= term->term_height) {
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term->cursor_row = term->term_height - 1;
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/* Copy screen up by one row */
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guac_send_copy(io,
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GUAC_DEFAULT_LAYER, 0, term->char_height,
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term->char_width * term->term_width,
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term->char_height * (term->term_height - 1),
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GUAC_COMP_SRC, GUAC_DEFAULT_LAYER, 0, 0);
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/* Fill bottom row with background */
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guac_send_rect(io,
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GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
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0, term->char_height * (term->term_height - 1),
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term->char_width * term->term_width,
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term->char_height * term->term_height,
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0, 0, 0, 255);
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}
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switch (c) {
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/* Bell */
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case 0x07:
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break;
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/* Backspace */
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case 0x08:
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if (term->cursor_col >= 1)
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term->cursor_col--;
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break;
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/* Carriage return */
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case '\r':
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term->cursor_col = 0;
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break;
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/* Line feed */
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case '\n':
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term->cursor_row++;
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break;
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/* ESC */
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case 0x1B:
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term->char_handler = ssh_guac_terminal_escape;
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break;
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/* Displayable chars */
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default:
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ssh_guac_terminal_send_glyph(term,
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term->cursor_row,
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term->cursor_col,
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c);
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/* Advance cursor */
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term->cursor_col++;
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}
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return 0;
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}
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int ssh_guac_terminal_escape(ssh_guac_terminal* term, char c) {
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switch (c) {
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case '(':
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term->char_handler = ssh_guac_terminal_charset;
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break;
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case ']':
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term->char_handler = ssh_guac_terminal_osc;
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term->term_seq_argc = 0;
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term->term_seq_argv_buffer_current = 0;
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break;
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case '[':
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term->char_handler = ssh_guac_terminal_csi;
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term->term_seq_argc = 0;
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term->term_seq_argv_buffer_current = 0;
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break;
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default:
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guac_log_info("Unhandled ESC sequence: %c", c);
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term->char_handler = ssh_guac_terminal_echo;
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}
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return 0;
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}
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int ssh_guac_terminal_charset(ssh_guac_terminal* term, char c) {
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term->char_handler = ssh_guac_terminal_echo;
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return 0;
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}
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int ssh_guac_terminal_csi(ssh_guac_terminal* term, char c) {
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GUACIO* io = term->client->io;
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/* FIXME: "The sequence of parameters may be preceded by a single question mark. */
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if (c == '?')
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return 0;
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/* Digits get concatenated into argv */
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if (c >= '0' && c <= '9') {
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/* Concatenate digit if there is space in buffer */
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if (term->term_seq_argv_buffer_current <
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sizeof(term->term_seq_argv_buffer)) {
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term->term_seq_argv_buffer[
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term->term_seq_argv_buffer_current++
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] = c;
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}
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}
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/* Any non-digit stops the parameter, and possibly the sequence */
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else {
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/* At most 16 parameters */
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if (term->term_seq_argc < 16) {
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/* Finish parameter */
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term->term_seq_argv_buffer[term->term_seq_argv_buffer_current] = 0;
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term->term_seq_argv[term->term_seq_argc++] =
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atoi(term->term_seq_argv_buffer);
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/* Prepare for next parameter */
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term->term_seq_argv_buffer_current = 0;
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}
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/* Handle CSI functions */
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switch (c) {
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/* H: Move cursor */
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case 'H':
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term->cursor_row = term->term_seq_argv[0] - 1;
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term->cursor_col = term->term_seq_argv[1] - 1;
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break;
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/* J: Erase display */
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case 'J':
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/* Erase from cursor to end of display */
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if (term->term_seq_argv[0] == 0) {
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/* Until end of line */
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guac_send_rect(io,
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GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
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term->cursor_col * term->char_width,
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term->cursor_row * term->char_height,
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(term->term_width - term->cursor_col) * term->char_width,
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term->char_height,
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0, 0, 0, 255); /* Background color */
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/* Until end of display */
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if (term->cursor_row < term->term_height - 1) {
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guac_send_rect(io,
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GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
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0,
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(term->cursor_row+1) * term->char_height,
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term->term_width * term->char_width,
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term->term_height * term->char_height,
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0, 0, 0, 255); /* Background color */
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}
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}
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/* Erase from start to cursor */
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else if (term->term_seq_argv[0] == 1) {
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/* Until start of line */
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guac_send_rect(io,
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GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
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0,
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term->cursor_row * term->char_height,
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term->cursor_col * term->char_width,
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term->char_height,
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0, 0, 0, 255); /* Background color */
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/* From start */
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if (term->cursor_row >= 1) {
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guac_send_rect(io,
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GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
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0,
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0,
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term->term_width * term->char_width,
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(term->cursor_row-1) * term->char_height,
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0, 0, 0, 255); /* Background color */
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}
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}
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/* Entire screen */
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else if (term->term_seq_argv[0] == 2) {
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guac_send_rect(io,
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GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
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0,
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0,
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term->term_width * term->char_width,
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term->term_height * term->char_height,
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0, 0, 0, 255); /* Background color */
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}
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break;
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/* K: Erase line */
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case 'K':
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/* Erase from cursor to end of line */
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if (term->term_seq_argv[0] == 0) {
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guac_send_rect(io,
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GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
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term->cursor_col * term->char_width,
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term->cursor_row * term->char_height,
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(term->term_width - term->cursor_col) * term->char_width,
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term->char_height,
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0, 0, 0, 255); /* Background color */
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}
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/* Erase from start to cursor */
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else if (term->term_seq_argv[0] == 1) {
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guac_send_rect(io,
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GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
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0,
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term->cursor_row * term->char_height,
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term->cursor_col * term->char_width,
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term->char_height,
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0, 0, 0, 255); /* Background color */
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}
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/* Erase line */
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else if (term->term_seq_argv[0] == 2) {
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guac_send_rect(io,
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GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
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0,
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term->cursor_row * term->char_height,
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term->term_width * term->char_width,
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term->char_height,
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0, 0, 0, 255); /* Background color */
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}
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break;
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/* Warn of unhandled codes */
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default:
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if (c != ';')
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guac_log_info("Unhandled CSI sequence: %c", c);
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}
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/* If not a semicolon, end of CSI sequence */
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if (c != ';')
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term->char_handler = ssh_guac_terminal_echo;
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}
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return 0;
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}
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int ssh_guac_terminal_osc(ssh_guac_terminal* term, char c) {
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/* TODO: Implement OSC */
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if (c == 0x9C || c == 0x5C || c == 0x07) /* ECMA-48 ST (String Terminator */
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term->char_handler = ssh_guac_terminal_echo;
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return 0;
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}
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