]>
Commit | Line | Data |
---|---|---|
8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
4 | * All rights reserved | |
bcbf86ec | 5 | * The main loop for the interactive session (client side). |
6ae2364d | 6 | * |
bcbf86ec | 7 | * As far as I am concerned, the code I have written for this software |
8 | * can be used freely for any purpose. Any derived versions of this | |
9 | * software must be clearly marked as such, and if the derived work is | |
10 | * incompatible with the protocol description in the RFC file, it must be | |
11 | * called by a name other than "ssh" or "Secure Shell". | |
6ae2364d | 12 | * |
6ae2364d | 13 | * |
bcbf86ec | 14 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. |
15 | * | |
16 | * Redistribution and use in source and binary forms, with or without | |
17 | * modification, are permitted provided that the following conditions | |
18 | * are met: | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * 2. Redistributions in binary form must reproduce the above copyright | |
22 | * notice, this list of conditions and the following disclaimer in the | |
23 | * documentation and/or other materials provided with the distribution. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | * | |
6ae2364d | 36 | * |
8ce64345 | 37 | * SSH2 support added by Markus Friedl. |
bcbf86ec | 38 | * Copyright (c) 1999,2000 Markus Friedl. All rights reserved. |
39 | * | |
40 | * Redistribution and use in source and binary forms, with or without | |
41 | * modification, are permitted provided that the following conditions | |
42 | * are met: | |
43 | * 1. Redistributions of source code must retain the above copyright | |
44 | * notice, this list of conditions and the following disclaimer. | |
45 | * 2. Redistributions in binary form must reproduce the above copyright | |
46 | * notice, this list of conditions and the following disclaimer in the | |
47 | * documentation and/or other materials provided with the distribution. | |
48 | * | |
49 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
50 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
51 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
52 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
53 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
54 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
55 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
56 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
57 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
58 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 59 | */ |
8efc0c15 | 60 | |
61 | #include "includes.h" | |
1fc8ccdf | 62 | RCSID("$OpenBSD: clientloop.c,v 1.48 2001/02/06 22:43:02 markus Exp $"); |
8efc0c15 | 63 | |
8efc0c15 | 64 | #include "ssh.h" |
42f11eb2 | 65 | #include "ssh1.h" |
66 | #include "ssh2.h" | |
67 | #include "xmalloc.h" | |
8efc0c15 | 68 | #include "packet.h" |
69 | #include "buffer.h" | |
7368a6c8 | 70 | #include "compat.h" |
71 | #include "channels.h" | |
72 | #include "dispatch.h" | |
2e73a022 | 73 | #include "buffer.h" |
74 | #include "bufaux.h" | |
fa08c86b | 75 | #include "key.h" |
42f11eb2 | 76 | #include "log.h" |
77 | #include "readconf.h" | |
b5c334cc | 78 | #include "clientloop.h" |
42f11eb2 | 79 | #include "authfd.h" |
80 | #include "atomicio.h" | |
a22aff1f | 81 | |
82 | /* import options */ | |
83 | extern Options options; | |
84 | ||
8efc0c15 | 85 | /* Flag indicating that stdin should be redirected from /dev/null. */ |
86 | extern int stdin_null_flag; | |
87 | ||
aa3378df | 88 | /* |
89 | * Name of the host we are connecting to. This is the name given on the | |
90 | * command line, or the HostName specified for the user-supplied name in a | |
91 | * configuration file. | |
92 | */ | |
8efc0c15 | 93 | extern char *host; |
94 | ||
aa3378df | 95 | /* |
96 | * Flag to indicate that we have received a window change signal which has | |
97 | * not yet been processed. This will cause a message indicating the new | |
98 | * window size to be sent to the server a little later. This is volatile | |
99 | * because this is updated in a signal handler. | |
100 | */ | |
8efc0c15 | 101 | static volatile int received_window_change_signal = 0; |
102 | ||
103 | /* Terminal modes, as saved by enter_raw_mode. */ | |
104 | static struct termios saved_tio; | |
105 | ||
aa3378df | 106 | /* |
107 | * Flag indicating whether we are in raw mode. This is used by | |
108 | * enter_raw_mode and leave_raw_mode. | |
109 | */ | |
8efc0c15 | 110 | static int in_raw_mode = 0; |
111 | ||
112 | /* Flag indicating whether the user\'s terminal is in non-blocking mode. */ | |
113 | static int in_non_blocking_mode = 0; | |
114 | ||
115 | /* Common data for the client loop code. */ | |
2e73a022 | 116 | static int quit_pending; /* Set to non-zero to quit the client loop. */ |
117 | static int escape_char; /* Escape character. */ | |
5260325f | 118 | static int escape_pending; /* Last character was the escape character */ |
119 | static int last_was_cr; /* Last character was a newline. */ | |
120 | static int exit_status; /* Used to store the exit status of the command. */ | |
121 | static int stdin_eof; /* EOF has been encountered on standard error. */ | |
122 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
123 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
124 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
1e3b8b07 | 125 | static u_long stdin_bytes, stdout_bytes, stderr_bytes; |
126 | static u_int buffer_high;/* Soft max buffer size. */ | |
5260325f | 127 | static int connection_in; /* Connection to server (input). */ |
128 | static int connection_out; /* Connection to server (output). */ | |
8efc0c15 | 129 | |
8ce64345 | 130 | void client_init_dispatch(void); |
131 | int session_ident = -1; | |
132 | ||
aa3378df | 133 | /* Returns the user\'s terminal to normal mode if it had been put in raw mode. */ |
8efc0c15 | 134 | |
6ae2364d | 135 | void |
5260325f | 136 | leave_raw_mode() |
8efc0c15 | 137 | { |
5260325f | 138 | if (!in_raw_mode) |
139 | return; | |
140 | in_raw_mode = 0; | |
141 | if (tcsetattr(fileno(stdin), TCSADRAIN, &saved_tio) < 0) | |
142 | perror("tcsetattr"); | |
8efc0c15 | 143 | |
5260325f | 144 | fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL); |
8efc0c15 | 145 | } |
146 | ||
147 | /* Puts the user\'s terminal in raw mode. */ | |
148 | ||
6ae2364d | 149 | void |
5260325f | 150 | enter_raw_mode() |
8efc0c15 | 151 | { |
5260325f | 152 | struct termios tio; |
153 | ||
154 | if (tcgetattr(fileno(stdin), &tio) < 0) | |
155 | perror("tcgetattr"); | |
156 | saved_tio = tio; | |
157 | tio.c_iflag |= IGNPAR; | |
158 | tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF); | |
159 | tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL); | |
8efc0c15 | 160 | #ifdef IEXTEN |
5260325f | 161 | tio.c_lflag &= ~IEXTEN; |
162 | #endif /* IEXTEN */ | |
163 | tio.c_oflag &= ~OPOST; | |
164 | tio.c_cc[VMIN] = 1; | |
165 | tio.c_cc[VTIME] = 0; | |
166 | if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) < 0) | |
167 | perror("tcsetattr"); | |
168 | in_raw_mode = 1; | |
169 | ||
170 | fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL); | |
171 | } | |
8efc0c15 | 172 | |
173 | /* Restores stdin to blocking mode. */ | |
174 | ||
6ae2364d | 175 | void |
5260325f | 176 | leave_non_blocking() |
8efc0c15 | 177 | { |
5260325f | 178 | if (in_non_blocking_mode) { |
179 | (void) fcntl(fileno(stdin), F_SETFL, 0); | |
180 | in_non_blocking_mode = 0; | |
181 | fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL); | |
182 | } | |
8efc0c15 | 183 | } |
184 | ||
5260325f | 185 | /* Puts stdin terminal in non-blocking mode. */ |
186 | ||
6ae2364d | 187 | void |
5260325f | 188 | enter_non_blocking() |
8efc0c15 | 189 | { |
5260325f | 190 | in_non_blocking_mode = 1; |
191 | (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK); | |
192 | fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL); | |
8efc0c15 | 193 | } |
194 | ||
aa3378df | 195 | /* |
196 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
197 | * flag indicating that the window has changed. | |
198 | */ | |
8efc0c15 | 199 | |
6ae2364d | 200 | void |
5260325f | 201 | window_change_handler(int sig) |
8efc0c15 | 202 | { |
5260325f | 203 | received_window_change_signal = 1; |
204 | signal(SIGWINCH, window_change_handler); | |
8efc0c15 | 205 | } |
206 | ||
aa3378df | 207 | /* |
208 | * Signal handler for signals that cause the program to terminate. These | |
209 | * signals must be trapped to restore terminal modes. | |
210 | */ | |
8efc0c15 | 211 | |
6ae2364d | 212 | void |
5260325f | 213 | signal_handler(int sig) |
8efc0c15 | 214 | { |
5260325f | 215 | if (in_raw_mode) |
216 | leave_raw_mode(); | |
217 | if (in_non_blocking_mode) | |
218 | leave_non_blocking(); | |
219 | channel_stop_listening(); | |
220 | packet_close(); | |
221 | fatal("Killed by signal %d.", sig); | |
8efc0c15 | 222 | } |
223 | ||
aa3378df | 224 | /* |
225 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
226 | * available resolution. | |
227 | */ | |
8efc0c15 | 228 | |
6ae2364d | 229 | double |
5260325f | 230 | get_current_time() |
8efc0c15 | 231 | { |
5260325f | 232 | struct timeval tv; |
233 | gettimeofday(&tv, NULL); | |
234 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
8efc0c15 | 235 | } |
236 | ||
aa3378df | 237 | /* |
238 | * This is called when the interactive is entered. This checks if there is | |
239 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
240 | * not appear to wake up when redirecting from /dev/null. | |
241 | */ | |
8efc0c15 | 242 | |
6ae2364d | 243 | void |
5260325f | 244 | client_check_initial_eof_on_stdin() |
8efc0c15 | 245 | { |
5260325f | 246 | int len; |
247 | char buf[1]; | |
248 | ||
aa3378df | 249 | /* |
250 | * If standard input is to be "redirected from /dev/null", we simply | |
251 | * mark that we have seen an EOF and send an EOF message to the | |
252 | * server. Otherwise, we try to read a single character; it appears | |
253 | * that for some files, such /dev/null, select() never wakes up for | |
254 | * read for this descriptor, which means that we never get EOF. This | |
255 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
256 | */ | |
5260325f | 257 | if (stdin_null_flag) { |
258 | /* Fake EOF on stdin. */ | |
259 | debug("Sending eof."); | |
260 | stdin_eof = 1; | |
261 | packet_start(SSH_CMSG_EOF); | |
262 | packet_send(); | |
263 | } else { | |
5260325f | 264 | enter_non_blocking(); |
265 | ||
266 | /* Check for immediate EOF on stdin. */ | |
267 | len = read(fileno(stdin), buf, 1); | |
268 | if (len == 0) { | |
aa3378df | 269 | /* EOF. Record that we have seen it and send EOF to server. */ |
5260325f | 270 | debug("Sending eof."); |
271 | stdin_eof = 1; | |
272 | packet_start(SSH_CMSG_EOF); | |
273 | packet_send(); | |
274 | } else if (len > 0) { | |
aa3378df | 275 | /* |
276 | * Got data. We must store the data in the buffer, | |
277 | * and also process it as an escape character if | |
278 | * appropriate. | |
279 | */ | |
1e3b8b07 | 280 | if ((u_char) buf[0] == escape_char) |
5260325f | 281 | escape_pending = 1; |
282 | else { | |
283 | buffer_append(&stdin_buffer, buf, 1); | |
284 | stdin_bytes += 1; | |
285 | } | |
286 | } | |
5260325f | 287 | leave_non_blocking(); |
8efc0c15 | 288 | } |
8efc0c15 | 289 | } |
290 | ||
8efc0c15 | 291 | |
aa3378df | 292 | /* |
293 | * Make packets from buffered stdin data, and buffer them for sending to the | |
294 | * connection. | |
295 | */ | |
8efc0c15 | 296 | |
6ae2364d | 297 | void |
5260325f | 298 | client_make_packets_from_stdin_data() |
8efc0c15 | 299 | { |
1e3b8b07 | 300 | u_int len; |
5260325f | 301 | |
302 | /* Send buffered stdin data to the server. */ | |
303 | while (buffer_len(&stdin_buffer) > 0 && | |
304 | packet_not_very_much_data_to_write()) { | |
305 | len = buffer_len(&stdin_buffer); | |
306 | /* Keep the packets at reasonable size. */ | |
307 | if (len > packet_get_maxsize()) | |
308 | len = packet_get_maxsize(); | |
309 | packet_start(SSH_CMSG_STDIN_DATA); | |
310 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
311 | packet_send(); | |
312 | buffer_consume(&stdin_buffer, len); | |
313 | /* If we have a pending EOF, send it now. */ | |
314 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
315 | packet_start(SSH_CMSG_EOF); | |
316 | packet_send(); | |
317 | } | |
8efc0c15 | 318 | } |
8efc0c15 | 319 | } |
320 | ||
aa3378df | 321 | /* |
322 | * Checks if the client window has changed, and sends a packet about it to | |
323 | * the server if so. The actual change is detected elsewhere (by a software | |
324 | * interrupt on Unix); this just checks the flag and sends a message if | |
325 | * appropriate. | |
326 | */ | |
8efc0c15 | 327 | |
6ae2364d | 328 | void |
5260325f | 329 | client_check_window_change() |
8efc0c15 | 330 | { |
8ce64345 | 331 | struct winsize ws; |
332 | ||
333 | if (! received_window_change_signal) | |
334 | return; | |
335 | /** XXX race */ | |
336 | received_window_change_signal = 0; | |
337 | ||
338 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
339 | return; | |
340 | ||
de273eef | 341 | debug2("client_check_window_change: changed"); |
8ce64345 | 342 | |
343 | if (compat20) { | |
344 | channel_request_start(session_ident, "window-change", 0); | |
345 | packet_put_int(ws.ws_col); | |
346 | packet_put_int(ws.ws_row); | |
347 | packet_put_int(ws.ws_xpixel); | |
348 | packet_put_int(ws.ws_ypixel); | |
349 | packet_send(); | |
350 | } else { | |
351 | packet_start(SSH_CMSG_WINDOW_SIZE); | |
352 | packet_put_int(ws.ws_row); | |
353 | packet_put_int(ws.ws_col); | |
354 | packet_put_int(ws.ws_xpixel); | |
355 | packet_put_int(ws.ws_ypixel); | |
356 | packet_send(); | |
8efc0c15 | 357 | } |
8efc0c15 | 358 | } |
359 | ||
aa3378df | 360 | /* |
361 | * Waits until the client can do something (some data becomes available on | |
362 | * one of the file descriptors). | |
363 | */ | |
8efc0c15 | 364 | |
6ae2364d | 365 | void |
39929cdb | 366 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
367 | int *maxfdp) | |
8efc0c15 | 368 | { |
39929cdb | 369 | /* Add any selections by the channel mechanism. */ |
370 | channel_prepare_select(readsetp, writesetp, maxfdp); | |
5260325f | 371 | |
8ce64345 | 372 | if (!compat20) { |
373 | /* Read from the connection, unless our buffers are full. */ | |
374 | if (buffer_len(&stdout_buffer) < buffer_high && | |
375 | buffer_len(&stderr_buffer) < buffer_high && | |
376 | channel_not_very_much_buffered_data()) | |
39929cdb | 377 | FD_SET(connection_in, *readsetp); |
8ce64345 | 378 | /* |
379 | * Read from stdin, unless we have seen EOF or have very much | |
380 | * buffered data to send to the server. | |
381 | */ | |
382 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
39929cdb | 383 | FD_SET(fileno(stdin), *readsetp); |
8ce64345 | 384 | |
385 | /* Select stdout/stderr if have data in buffer. */ | |
386 | if (buffer_len(&stdout_buffer) > 0) | |
39929cdb | 387 | FD_SET(fileno(stdout), *writesetp); |
8ce64345 | 388 | if (buffer_len(&stderr_buffer) > 0) |
39929cdb | 389 | FD_SET(fileno(stderr), *writesetp); |
8ce64345 | 390 | } else { |
39929cdb | 391 | FD_SET(connection_in, *readsetp); |
8ce64345 | 392 | } |
5260325f | 393 | |
5260325f | 394 | /* Select server connection if have data to write to the server. */ |
395 | if (packet_have_data_to_write()) | |
39929cdb | 396 | FD_SET(connection_out, *writesetp); |
5260325f | 397 | |
aa3378df | 398 | /* |
399 | * Wait for something to happen. This will suspend the process until | |
400 | * some selected descriptor can be read, written, or has some other | |
401 | * event pending. Note: if you want to implement SSH_MSG_IGNORE | |
402 | * messages to fool traffic analysis, this might be the place to do | |
403 | * it: just have a random timeout for the select, and send a random | |
404 | * SSH_MSG_IGNORE packet when the timeout expires. | |
405 | */ | |
5260325f | 406 | |
39929cdb | 407 | if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) { |
5260325f | 408 | char buf[100]; |
5260325f | 409 | if (errno == EINTR) |
410 | return; | |
411 | /* Note: we might still have data in the buffers. */ | |
412 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
413 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
414 | stderr_bytes += strlen(buf); | |
415 | quit_pending = 1; | |
416 | } | |
8efc0c15 | 417 | } |
418 | ||
6ae2364d | 419 | void |
2e73a022 | 420 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
8efc0c15 | 421 | { |
5260325f | 422 | struct winsize oldws, newws; |
423 | ||
424 | /* Flush stdout and stderr buffers. */ | |
2e73a022 | 425 | if (buffer_len(bout) > 0) |
426 | atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); | |
427 | if (buffer_len(berr) > 0) | |
428 | atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); | |
5260325f | 429 | |
5260325f | 430 | leave_raw_mode(); |
431 | ||
aa3378df | 432 | /* |
433 | * Free (and clear) the buffer to reduce the amount of data that gets | |
434 | * written to swap. | |
435 | */ | |
2e73a022 | 436 | buffer_free(bin); |
437 | buffer_free(bout); | |
438 | buffer_free(berr); | |
5260325f | 439 | |
440 | /* Save old window size. */ | |
441 | ioctl(fileno(stdin), TIOCGWINSZ, &oldws); | |
442 | ||
443 | /* Send the suspend signal to the program itself. */ | |
444 | kill(getpid(), SIGTSTP); | |
445 | ||
446 | /* Check if the window size has changed. */ | |
447 | if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 && | |
448 | (oldws.ws_row != newws.ws_row || | |
449 | oldws.ws_col != newws.ws_col || | |
450 | oldws.ws_xpixel != newws.ws_xpixel || | |
451 | oldws.ws_ypixel != newws.ws_ypixel)) | |
452 | received_window_change_signal = 1; | |
453 | ||
454 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
2e73a022 | 455 | buffer_init(bin); |
456 | buffer_init(bout); | |
457 | buffer_init(berr); | |
5260325f | 458 | |
5260325f | 459 | enter_raw_mode(); |
8efc0c15 | 460 | } |
461 | ||
6ae2364d | 462 | void |
8ce64345 | 463 | client_process_net_input(fd_set * readset) |
8efc0c15 | 464 | { |
8ce64345 | 465 | int len; |
466 | char buf[8192]; | |
5260325f | 467 | |
aa3378df | 468 | /* |
469 | * Read input from the server, and add any such data to the buffer of | |
470 | * the packet subsystem. | |
471 | */ | |
5260325f | 472 | if (FD_ISSET(connection_in, readset)) { |
473 | /* Read as much as possible. */ | |
474 | len = read(connection_in, buf, sizeof(buf)); | |
475 | if (len == 0) { | |
476 | /* Received EOF. The remote host has closed the connection. */ | |
477 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
478 | host); | |
8efc0c15 | 479 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
480 | stderr_bytes += strlen(buf); | |
481 | quit_pending = 1; | |
482 | return; | |
5260325f | 483 | } |
aa3378df | 484 | /* |
485 | * There is a kernel bug on Solaris that causes select to | |
486 | * sometimes wake up even though there is no data available. | |
487 | */ | |
5260325f | 488 | if (len < 0 && errno == EAGAIN) |
489 | len = 0; | |
490 | ||
491 | if (len < 0) { | |
492 | /* An error has encountered. Perhaps there is a network problem. */ | |
493 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
494 | host, strerror(errno)); | |
495 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
496 | stderr_bytes += strlen(buf); | |
497 | quit_pending = 1; | |
498 | return; | |
499 | } | |
500 | packet_process_incoming(buf, len); | |
501 | } | |
8ce64345 | 502 | } |
503 | ||
2e73a022 | 504 | /* process the characters one by one */ |
505 | int | |
506 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) | |
507 | { | |
508 | char string[1024]; | |
509 | pid_t pid; | |
510 | int bytes = 0; | |
1e3b8b07 | 511 | u_int i; |
512 | u_char ch; | |
2e73a022 | 513 | char *s; |
514 | ||
515 | for (i = 0; i < len; i++) { | |
516 | /* Get one character at a time. */ | |
517 | ch = buf[i]; | |
518 | ||
519 | if (escape_pending) { | |
520 | /* We have previously seen an escape character. */ | |
521 | /* Clear the flag now. */ | |
522 | escape_pending = 0; | |
523 | ||
524 | /* Process the escaped character. */ | |
525 | switch (ch) { | |
526 | case '.': | |
527 | /* Terminate the connection. */ | |
528 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
529 | buffer_append(berr, string, strlen(string)); | |
530 | /*stderr_bytes += strlen(string); XXX*/ | |
531 | ||
532 | quit_pending = 1; | |
533 | return -1; | |
534 | ||
535 | case 'Z' - 64: | |
536 | /* Suspend the program. */ | |
537 | /* Print a message to that effect to the user. */ | |
538 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
539 | buffer_append(berr, string, strlen(string)); | |
540 | /*stderr_bytes += strlen(string); XXX*/ | |
541 | ||
542 | /* Restore terminal modes and suspend. */ | |
543 | client_suspend_self(bin, bout, berr); | |
544 | ||
545 | /* We have been continued. */ | |
546 | continue; | |
547 | ||
548 | case '&': | |
549 | /* XXX does not work yet with proto 2 */ | |
550 | if (compat20) | |
551 | continue; | |
552 | /* | |
553 | * Detach the program (continue to serve connections, | |
554 | * but put in background and no more new connections). | |
555 | */ | |
556 | if (!stdin_eof) { | |
557 | /* | |
558 | * Sending SSH_CMSG_EOF alone does not always appear | |
559 | * to be enough. So we try to send an EOF character | |
560 | * first. | |
561 | */ | |
562 | packet_start(SSH_CMSG_STDIN_DATA); | |
563 | packet_put_string("\004", 1); | |
564 | packet_send(); | |
565 | /* Close stdin. */ | |
566 | stdin_eof = 1; | |
567 | if (buffer_len(bin) == 0) { | |
568 | packet_start(SSH_CMSG_EOF); | |
569 | packet_send(); | |
570 | } | |
571 | } | |
572 | /* Restore tty modes. */ | |
573 | leave_raw_mode(); | |
574 | ||
575 | /* Stop listening for new connections. */ | |
576 | channel_stop_listening(); | |
577 | ||
578 | printf("%c& [backgrounded]\n", escape_char); | |
579 | ||
580 | /* Fork into background. */ | |
581 | pid = fork(); | |
582 | if (pid < 0) { | |
583 | error("fork: %.100s", strerror(errno)); | |
584 | continue; | |
585 | } | |
586 | if (pid != 0) { /* This is the parent. */ | |
587 | /* The parent just exits. */ | |
588 | exit(0); | |
589 | } | |
590 | /* The child continues serving connections. */ | |
591 | continue; /*XXX ? */ | |
592 | ||
593 | case '?': | |
594 | snprintf(string, sizeof string, | |
595 | "%c?\r\n\ | |
596 | Supported escape sequences:\r\n\ | |
597 | ~. - terminate connection\r\n\ | |
598 | ~^Z - suspend ssh\r\n\ | |
599 | ~# - list forwarded connections\r\n\ | |
600 | ~& - background ssh (when waiting for connections to terminate)\r\n\ | |
601 | ~? - this message\r\n\ | |
602 | ~~ - send the escape character by typing it twice\r\n\ | |
603 | (Note that escapes are only recognized immediately after newline.)\r\n", | |
604 | escape_char); | |
605 | buffer_append(berr, string, strlen(string)); | |
606 | continue; | |
607 | ||
608 | case '#': | |
609 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
610 | buffer_append(berr, string, strlen(string)); | |
611 | s = channel_open_message(); | |
612 | buffer_append(berr, s, strlen(s)); | |
613 | xfree(s); | |
614 | continue; | |
615 | ||
616 | default: | |
617 | if (ch != escape_char) { | |
618 | buffer_put_char(bin, escape_char); | |
619 | bytes++; | |
620 | } | |
621 | /* Escaped characters fall through here */ | |
622 | break; | |
623 | } | |
624 | } else { | |
625 | /* | |
626 | * The previous character was not an escape char. Check if this | |
627 | * is an escape. | |
628 | */ | |
629 | if (last_was_cr && ch == escape_char) { | |
630 | /* It is. Set the flag and continue to next character. */ | |
631 | escape_pending = 1; | |
632 | continue; | |
633 | } | |
634 | } | |
635 | ||
636 | /* | |
637 | * Normal character. Record whether it was a newline, | |
638 | * and append it to the buffer. | |
639 | */ | |
640 | last_was_cr = (ch == '\r' || ch == '\n'); | |
641 | buffer_put_char(bin, ch); | |
642 | bytes++; | |
643 | } | |
644 | return bytes; | |
645 | } | |
646 | ||
6ae2364d | 647 | void |
8ce64345 | 648 | client_process_input(fd_set * readset) |
649 | { | |
2e73a022 | 650 | int ret; |
9da5c3c9 | 651 | int len; |
2e73a022 | 652 | char buf[8192]; |
8ce64345 | 653 | |
5260325f | 654 | /* Read input from stdin. */ |
655 | if (FD_ISSET(fileno(stdin), readset)) { | |
656 | /* Read as much as possible. */ | |
657 | len = read(fileno(stdin), buf, sizeof(buf)); | |
658 | if (len <= 0) { | |
aa3378df | 659 | /* |
660 | * Received EOF or error. They are treated | |
661 | * similarly, except that an error message is printed | |
662 | * if it was an error condition. | |
663 | */ | |
5260325f | 664 | if (len < 0) { |
665 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
666 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
667 | stderr_bytes += strlen(buf); | |
668 | } | |
669 | /* Mark that we have seen EOF. */ | |
670 | stdin_eof = 1; | |
aa3378df | 671 | /* |
672 | * Send an EOF message to the server unless there is | |
673 | * data in the buffer. If there is data in the | |
674 | * buffer, no message will be sent now. Code | |
675 | * elsewhere will send the EOF when the buffer | |
676 | * becomes empty if stdin_eof is set. | |
677 | */ | |
5260325f | 678 | if (buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 679 | packet_start(SSH_CMSG_EOF); |
680 | packet_send(); | |
5260325f | 681 | } |
682 | } else if (escape_char == -1) { | |
aa3378df | 683 | /* |
684 | * Normal successful read, and no escape character. | |
685 | * Just append the data to buffer. | |
686 | */ | |
5260325f | 687 | buffer_append(&stdin_buffer, buf, len); |
688 | stdin_bytes += len; | |
689 | } else { | |
aa3378df | 690 | /* |
691 | * Normal, successful read. But we have an escape character | |
692 | * and have to process the characters one by one. | |
693 | */ | |
2e73a022 | 694 | ret = process_escapes(&stdin_buffer, &stdout_buffer, &stderr_buffer, buf, len); |
695 | if (ret == -1) | |
696 | return; | |
697 | stdout_bytes += ret; | |
5260325f | 698 | } |
699 | } | |
8efc0c15 | 700 | } |
701 | ||
6ae2364d | 702 | void |
5260325f | 703 | client_process_output(fd_set * writeset) |
8efc0c15 | 704 | { |
5260325f | 705 | int len; |
706 | char buf[100]; | |
707 | ||
708 | /* Write buffered output to stdout. */ | |
709 | if (FD_ISSET(fileno(stdout), writeset)) { | |
710 | /* Write as much data as possible. */ | |
711 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 712 | buffer_len(&stdout_buffer)); |
5260325f | 713 | if (len <= 0) { |
714 | if (errno == EAGAIN) | |
715 | len = 0; | |
716 | else { | |
aa3378df | 717 | /* |
718 | * An error or EOF was encountered. Put an | |
719 | * error message to stderr buffer. | |
720 | */ | |
5260325f | 721 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
722 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
723 | stderr_bytes += strlen(buf); | |
724 | quit_pending = 1; | |
725 | return; | |
726 | } | |
727 | } | |
728 | /* Consume printed data from the buffer. */ | |
729 | buffer_consume(&stdout_buffer, len); | |
730 | } | |
731 | /* Write buffered output to stderr. */ | |
732 | if (FD_ISSET(fileno(stderr), writeset)) { | |
733 | /* Write as much data as possible. */ | |
734 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 735 | buffer_len(&stderr_buffer)); |
5260325f | 736 | if (len <= 0) { |
737 | if (errno == EAGAIN) | |
738 | len = 0; | |
739 | else { | |
aa3378df | 740 | /* EOF or error, but can't even print error message. */ |
5260325f | 741 | quit_pending = 1; |
742 | return; | |
743 | } | |
744 | } | |
745 | /* Consume printed characters from the buffer. */ | |
746 | buffer_consume(&stderr_buffer, len); | |
8efc0c15 | 747 | } |
8efc0c15 | 748 | } |
749 | ||
7368a6c8 | 750 | /* |
751 | * Get packets from the connection input buffer, and process them as long as | |
752 | * there are packets available. | |
753 | * | |
754 | * Any unknown packets received during the actual | |
755 | * session cause the session to terminate. This is | |
756 | * intended to make debugging easier since no | |
757 | * confirmations are sent. Any compatible protocol | |
758 | * extensions must be negotiated during the | |
759 | * preparatory phase. | |
760 | */ | |
761 | ||
6ae2364d | 762 | void |
7368a6c8 | 763 | client_process_buffered_input_packets() |
764 | { | |
188adeb2 | 765 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, NULL); |
7368a6c8 | 766 | } |
767 | ||
2e73a022 | 768 | /* scan buf[] for '~' before sending data to the peer */ |
769 | ||
770 | int | |
771 | simple_escape_filter(Channel *c, char *buf, int len) | |
772 | { | |
773 | /* XXX we assume c->extended is writeable */ | |
774 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
775 | } | |
776 | ||
aa3378df | 777 | /* |
778 | * Implements the interactive session with the server. This is called after | |
779 | * the user has been authenticated, and a command has been started on the | |
780 | * remote host. If escape_char != -1, it is the character used as an escape | |
781 | * character for terminating or suspending the session. | |
782 | */ | |
8efc0c15 | 783 | |
6ae2364d | 784 | int |
2e73a022 | 785 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
8efc0c15 | 786 | { |
39929cdb | 787 | fd_set *readset = NULL, *writeset = NULL; |
788 | int max_fd = 0; | |
5260325f | 789 | double start_time, total_time; |
790 | int len; | |
791 | char buf[100]; | |
792 | ||
793 | debug("Entering interactive session."); | |
794 | ||
795 | start_time = get_current_time(); | |
796 | ||
797 | /* Initialize variables. */ | |
798 | escape_pending = 0; | |
799 | last_was_cr = 1; | |
800 | exit_status = -1; | |
801 | stdin_eof = 0; | |
802 | buffer_high = 64 * 1024; | |
803 | connection_in = packet_get_connection_in(); | |
804 | connection_out = packet_get_connection_out(); | |
39929cdb | 805 | max_fd = MAX(connection_in, connection_out); |
806 | ||
807 | if (!compat20) { | |
808 | max_fd = MAX(max_fd, fileno(stdin)); | |
809 | max_fd = MAX(max_fd, fileno(stdout)); | |
810 | max_fd = MAX(max_fd, fileno(stderr)); | |
811 | } | |
5260325f | 812 | stdin_bytes = 0; |
813 | stdout_bytes = 0; | |
814 | stderr_bytes = 0; | |
815 | quit_pending = 0; | |
816 | escape_char = escape_char_arg; | |
817 | ||
818 | /* Initialize buffers. */ | |
819 | buffer_init(&stdin_buffer); | |
820 | buffer_init(&stdout_buffer); | |
821 | buffer_init(&stderr_buffer); | |
822 | ||
7368a6c8 | 823 | client_init_dispatch(); |
824 | ||
5260325f | 825 | /* Set signal handlers to restore non-blocking mode. */ |
826 | signal(SIGINT, signal_handler); | |
827 | signal(SIGQUIT, signal_handler); | |
828 | signal(SIGTERM, signal_handler); | |
829 | signal(SIGPIPE, SIG_IGN); | |
830 | if (have_pty) | |
831 | signal(SIGWINCH, window_change_handler); | |
832 | ||
5260325f | 833 | if (have_pty) |
834 | enter_raw_mode(); | |
835 | ||
1fc8ccdf | 836 | if (compat20) { |
837 | session_ident = ssh2_chan_id; | |
838 | if (escape_char != -1) | |
839 | channel_register_filter(session_ident, | |
840 | simple_escape_filter); | |
841 | } else { | |
842 | /* Check if we should immediately send eof on stdin. */ | |
8ce64345 | 843 | client_check_initial_eof_on_stdin(); |
1fc8ccdf | 844 | } |
2e73a022 | 845 | |
5260325f | 846 | /* Main loop of the client for the interactive session mode. */ |
847 | while (!quit_pending) { | |
5260325f | 848 | |
aa3378df | 849 | /* Process buffered packets sent by the server. */ |
5260325f | 850 | client_process_buffered_input_packets(); |
851 | ||
8ce64345 | 852 | if (compat20 && !channel_still_open()) { |
de273eef | 853 | debug2("!channel_still_open."); |
8ce64345 | 854 | break; |
855 | } | |
856 | ||
aa3378df | 857 | /* |
858 | * Make packets of buffered stdin data, and buffer them for | |
859 | * sending to the server. | |
860 | */ | |
8ce64345 | 861 | if (!compat20) |
862 | client_make_packets_from_stdin_data(); | |
5260325f | 863 | |
aa3378df | 864 | /* |
39929cdb | 865 | * Make packets from buffered channel data, and enqueue them |
aa3378df | 866 | * for sending to the server. |
867 | */ | |
5260325f | 868 | if (packet_not_very_much_data_to_write()) |
869 | channel_output_poll(); | |
870 | ||
aa3378df | 871 | /* |
872 | * Check if the window size has changed, and buffer a message | |
873 | * about it to the server if so. | |
874 | */ | |
5260325f | 875 | client_check_window_change(); |
876 | ||
877 | if (quit_pending) | |
878 | break; | |
879 | ||
aa3378df | 880 | /* |
881 | * Wait until we have something to do (something becomes | |
882 | * available on one of the descriptors). | |
883 | */ | |
39929cdb | 884 | client_wait_until_can_do_something(&readset, &writeset, &max_fd); |
5260325f | 885 | |
886 | if (quit_pending) | |
887 | break; | |
888 | ||
889 | /* Do channel operations. */ | |
39929cdb | 890 | channel_after_select(readset, writeset); |
5260325f | 891 | |
8ce64345 | 892 | /* Buffer input from the connection. */ |
39929cdb | 893 | client_process_net_input(readset); |
5260325f | 894 | |
8ce64345 | 895 | if (quit_pending) |
896 | break; | |
897 | ||
898 | if (!compat20) { | |
899 | /* Buffer data from stdin */ | |
39929cdb | 900 | client_process_input(readset); |
8ce64345 | 901 | /* |
902 | * Process output to stdout and stderr. Output to | |
903 | * the connection is processed elsewhere (above). | |
904 | */ | |
39929cdb | 905 | client_process_output(writeset); |
8ce64345 | 906 | } |
5260325f | 907 | |
aa3378df | 908 | /* Send as much buffered packet data as possible to the sender. */ |
39929cdb | 909 | if (FD_ISSET(connection_out, writeset)) |
5260325f | 910 | packet_write_poll(); |
911 | } | |
39929cdb | 912 | if (readset) |
913 | xfree(readset); | |
914 | if (writeset) | |
915 | xfree(writeset); | |
5260325f | 916 | |
917 | /* Terminate the session. */ | |
918 | ||
919 | /* Stop watching for window change. */ | |
920 | if (have_pty) | |
921 | signal(SIGWINCH, SIG_DFL); | |
922 | ||
923 | /* Stop listening for connections. */ | |
924 | channel_stop_listening(); | |
925 | ||
aa3378df | 926 | /* |
927 | * In interactive mode (with pseudo tty) display a message indicating | |
928 | * that the connection has been closed. | |
929 | */ | |
5260325f | 930 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { |
931 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
932 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
933 | stderr_bytes += strlen(buf); | |
8efc0c15 | 934 | } |
5260325f | 935 | /* Output any buffered data for stdout. */ |
936 | while (buffer_len(&stdout_buffer) > 0) { | |
937 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 938 | buffer_len(&stdout_buffer)); |
5260325f | 939 | if (len <= 0) { |
940 | error("Write failed flushing stdout buffer."); | |
941 | break; | |
942 | } | |
943 | buffer_consume(&stdout_buffer, len); | |
8efc0c15 | 944 | } |
5260325f | 945 | |
946 | /* Output any buffered data for stderr. */ | |
947 | while (buffer_len(&stderr_buffer) > 0) { | |
948 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 949 | buffer_len(&stderr_buffer)); |
5260325f | 950 | if (len <= 0) { |
951 | error("Write failed flushing stderr buffer."); | |
952 | break; | |
953 | } | |
954 | buffer_consume(&stderr_buffer, len); | |
955 | } | |
956 | ||
5260325f | 957 | if (have_pty) |
958 | leave_raw_mode(); | |
959 | ||
960 | /* Clear and free any buffers. */ | |
961 | memset(buf, 0, sizeof(buf)); | |
962 | buffer_free(&stdin_buffer); | |
963 | buffer_free(&stdout_buffer); | |
964 | buffer_free(&stderr_buffer); | |
965 | ||
966 | /* Report bytes transferred, and transfer rates. */ | |
967 | total_time = get_current_time() - start_time; | |
968 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
969 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); | |
970 | if (total_time > 0) | |
971 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
972 | stdin_bytes / total_time, stdout_bytes / total_time, | |
973 | stderr_bytes / total_time); | |
974 | ||
975 | /* Return the exit status of the program. */ | |
976 | debug("Exit status %d", exit_status); | |
977 | return exit_status; | |
8efc0c15 | 978 | } |
7368a6c8 | 979 | |
980 | /*********/ | |
981 | ||
982 | void | |
188adeb2 | 983 | client_input_stdout_data(int type, int plen, void *ctxt) |
7368a6c8 | 984 | { |
1e3b8b07 | 985 | u_int data_len; |
7368a6c8 | 986 | char *data = packet_get_string(&data_len); |
987 | packet_integrity_check(plen, 4 + data_len, type); | |
988 | buffer_append(&stdout_buffer, data, data_len); | |
989 | stdout_bytes += data_len; | |
990 | memset(data, 0, data_len); | |
991 | xfree(data); | |
992 | } | |
993 | void | |
188adeb2 | 994 | client_input_stderr_data(int type, int plen, void *ctxt) |
7368a6c8 | 995 | { |
1e3b8b07 | 996 | u_int data_len; |
7368a6c8 | 997 | char *data = packet_get_string(&data_len); |
998 | packet_integrity_check(plen, 4 + data_len, type); | |
999 | buffer_append(&stderr_buffer, data, data_len); | |
1000 | stdout_bytes += data_len; | |
1001 | memset(data, 0, data_len); | |
1002 | xfree(data); | |
1003 | } | |
1004 | void | |
188adeb2 | 1005 | client_input_exit_status(int type, int plen, void *ctxt) |
7368a6c8 | 1006 | { |
1007 | packet_integrity_check(plen, 4, type); | |
1008 | exit_status = packet_get_int(); | |
1009 | /* Acknowledge the exit. */ | |
1010 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1011 | packet_send(); | |
1012 | /* | |
1013 | * Must wait for packet to be sent since we are | |
1014 | * exiting the loop. | |
1015 | */ | |
1016 | packet_write_wait(); | |
1017 | /* Flag that we want to exit. */ | |
1018 | quit_pending = 1; | |
1019 | } | |
1020 | ||
fa08c86b | 1021 | Channel * |
1022 | client_request_forwarded_tcpip(const char *request_type, int rchan) | |
1023 | { | |
1024 | Channel* c = NULL; | |
1025 | char *listen_address, *originator_address; | |
1026 | int listen_port, originator_port; | |
1027 | int sock, newch; | |
1028 | ||
1029 | /* Get rest of the packet */ | |
1030 | listen_address = packet_get_string(NULL); | |
1031 | listen_port = packet_get_int(); | |
1032 | originator_address = packet_get_string(NULL); | |
1033 | originator_port = packet_get_int(); | |
1034 | packet_done(); | |
1035 | ||
1036 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", | |
1037 | listen_address, listen_port, originator_address, originator_port); | |
1038 | ||
1039 | sock = channel_connect_by_listen_adress(listen_port); | |
1040 | if (sock >= 0) { | |
1041 | newch = channel_new("forwarded-tcpip", | |
97fb6912 | 1042 | SSH_CHANNEL_CONNECTING, sock, sock, -1, |
fa08c86b | 1043 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, |
1044 | xstrdup(originator_address), 1); | |
1045 | c = channel_lookup(newch); | |
1046 | } | |
1047 | xfree(originator_address); | |
1048 | xfree(listen_address); | |
1049 | return c; | |
1050 | } | |
1051 | ||
1052 | Channel* | |
1053 | client_request_x11(const char *request_type, int rchan) | |
1054 | { | |
1055 | Channel *c = NULL; | |
1056 | char *originator; | |
1057 | int originator_port; | |
1058 | int sock, newch; | |
1059 | ||
1060 | if (!options.forward_x11) { | |
1061 | error("Warning: ssh server tried X11 forwarding."); | |
1062 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1063 | return NULL; | |
1064 | } | |
1065 | originator = packet_get_string(NULL); | |
1066 | if (datafellows & SSH_BUG_X11FWD) { | |
1067 | debug2("buggy server: x11 request w/o originator_port"); | |
1068 | originator_port = 0; | |
1069 | } else { | |
1070 | originator_port = packet_get_int(); | |
1071 | } | |
1072 | packet_done(); | |
1073 | /* XXX check permission */ | |
865ac82e | 1074 | debug("client_request_x11: request from %s %d", originator, |
1075 | originator_port); | |
fa08c86b | 1076 | sock = x11_connect_display(); |
1077 | if (sock >= 0) { | |
1078 | newch = channel_new("x11", | |
1079 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
1080 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, | |
1081 | xstrdup("x11"), 1); | |
1082 | c = channel_lookup(newch); | |
1083 | } | |
1084 | xfree(originator); | |
1085 | return c; | |
1086 | } | |
1087 | ||
1088 | Channel* | |
1089 | client_request_agent(const char *request_type, int rchan) | |
1090 | { | |
1091 | Channel *c = NULL; | |
1092 | int sock, newch; | |
1093 | ||
1094 | if (!options.forward_agent) { | |
1095 | error("Warning: ssh server tried agent forwarding."); | |
1096 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1097 | return NULL; | |
1098 | } | |
1099 | sock = ssh_get_authentication_socket(); | |
1100 | if (sock >= 0) { | |
1101 | newch = channel_new("authentication agent connection", | |
1102 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1103 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
1104 | xstrdup("authentication agent connection"), 1); | |
1105 | c = channel_lookup(newch); | |
1106 | } | |
1107 | return c; | |
1108 | } | |
1109 | ||
0b242b12 | 1110 | /* XXXX move to generic input handler */ |
1111 | void | |
188adeb2 | 1112 | client_input_channel_open(int type, int plen, void *ctxt) |
0b242b12 | 1113 | { |
1114 | Channel *c = NULL; | |
1115 | char *ctype; | |
1e3b8b07 | 1116 | u_int len; |
0b242b12 | 1117 | int rchan; |
1118 | int rmaxpack; | |
1119 | int rwindow; | |
1120 | ||
1121 | ctype = packet_get_string(&len); | |
1122 | rchan = packet_get_int(); | |
1123 | rwindow = packet_get_int(); | |
1124 | rmaxpack = packet_get_int(); | |
1125 | ||
1d1ffb87 | 1126 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
0b242b12 | 1127 | ctype, rchan, rwindow, rmaxpack); |
1128 | ||
fa08c86b | 1129 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
1130 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1131 | } else if (strcmp(ctype, "x11") == 0) { | |
1132 | c = client_request_x11(ctype, rchan); | |
1133 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1134 | c = client_request_agent(ctype, rchan); | |
0b242b12 | 1135 | } |
1136 | /* XXX duplicate : */ | |
1137 | if (c != NULL) { | |
1138 | debug("confirm %s", ctype); | |
1139 | c->remote_id = rchan; | |
1140 | c->remote_window = rwindow; | |
1141 | c->remote_maxpacket = rmaxpack; | |
1142 | ||
1143 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1144 | packet_put_int(c->remote_id); | |
1145 | packet_put_int(c->self); | |
1146 | packet_put_int(c->local_window); | |
1147 | packet_put_int(c->local_maxpacket); | |
1148 | packet_send(); | |
1149 | } else { | |
1150 | debug("failure %s", ctype); | |
1151 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1152 | packet_put_int(rchan); | |
1153 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
1154 | packet_put_cstring("bla bla"); | |
1155 | packet_put_cstring(""); | |
1156 | packet_send(); | |
1157 | } | |
1158 | xfree(ctype); | |
1159 | } | |
1fc8ccdf | 1160 | void |
1161 | client_input_channel_req(int type, int plen, void *ctxt) | |
1162 | { | |
1163 | Channel *c = NULL; | |
1164 | int id, reply, success = 0; | |
1165 | char *rtype; | |
1166 | ||
1167 | id = packet_get_int(); | |
1168 | rtype = packet_get_string(NULL); | |
1169 | reply = packet_get_char(); | |
1170 | ||
1171 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1172 | id, rtype, reply); | |
1173 | ||
1174 | if (session_ident == -1) { | |
1175 | error("client_input_channel_req: no channel %d", session_ident); | |
1176 | } else if (id != session_ident) { | |
1177 | error("client_input_channel_req: channel %d: wrong channel: %d", | |
1178 | session_ident, id); | |
1179 | } | |
1180 | c = channel_lookup(id); | |
1181 | if (c == NULL) { | |
1182 | error("client_input_channel_req: channel %d: unknown channel", id); | |
1183 | } else if (strcmp(rtype, "exit-status") == 0) { | |
1184 | success = 1; | |
1185 | exit_status = packet_get_int(); | |
1186 | packet_done(); | |
1187 | } | |
1188 | if (reply) { | |
1189 | packet_start(success ? | |
1190 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1191 | packet_put_int(c->remote_id); | |
1192 | packet_send(); | |
1193 | } | |
1194 | xfree(rtype); | |
1195 | } | |
0b242b12 | 1196 | |
6ae2364d | 1197 | void |
8ce64345 | 1198 | client_init_dispatch_20() |
1199 | { | |
1200 | dispatch_init(&dispatch_protocol_error); | |
1201 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); | |
1202 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1203 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1204 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
0b242b12 | 1205 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
8ce64345 | 1206 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1207 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1fc8ccdf | 1208 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
8ce64345 | 1209 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
1210 | } | |
6ae2364d | 1211 | void |
7368a6c8 | 1212 | client_init_dispatch_13() |
1213 | { | |
1214 | dispatch_init(NULL); | |
1215 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1216 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1217 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
7368a6c8 | 1218 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1219 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1220 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
7368a6c8 | 1221 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
1222 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1223 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
a22aff1f | 1224 | |
1225 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
1226 | &auth_input_open_request : &deny_input_open); | |
1227 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? | |
1228 | &x11_input_open : &deny_input_open); | |
7368a6c8 | 1229 | } |
6ae2364d | 1230 | void |
7368a6c8 | 1231 | client_init_dispatch_15() |
1232 | { | |
1233 | client_init_dispatch_13(); | |
1234 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1235 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1236 | } | |
6ae2364d | 1237 | void |
7368a6c8 | 1238 | client_init_dispatch() |
1239 | { | |
8ce64345 | 1240 | if (compat20) |
1241 | client_init_dispatch_20(); | |
1242 | else if (compat13) | |
7368a6c8 | 1243 | client_init_dispatch_13(); |
1244 | else | |
1245 | client_init_dispatch_15(); | |
1246 | } |