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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" | |
c422989b | 62 | RCSID("$OpenBSD: clientloop.c,v 1.56 2001/04/04 20:25:37 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" |
e092ce67 | 76 | #include "kex.h" |
42f11eb2 | 77 | #include "log.h" |
78 | #include "readconf.h" | |
b5c334cc | 79 | #include "clientloop.h" |
42f11eb2 | 80 | #include "authfd.h" |
81 | #include "atomicio.h" | |
a22aff1f | 82 | |
83 | /* import options */ | |
84 | extern Options options; | |
85 | ||
8efc0c15 | 86 | /* Flag indicating that stdin should be redirected from /dev/null. */ |
87 | extern int stdin_null_flag; | |
88 | ||
aa3378df | 89 | /* |
90 | * Name of the host we are connecting to. This is the name given on the | |
91 | * command line, or the HostName specified for the user-supplied name in a | |
92 | * configuration file. | |
93 | */ | |
8efc0c15 | 94 | extern char *host; |
95 | ||
aa3378df | 96 | /* |
97 | * Flag to indicate that we have received a window change signal which has | |
98 | * not yet been processed. This will cause a message indicating the new | |
99 | * window size to be sent to the server a little later. This is volatile | |
100 | * because this is updated in a signal handler. | |
101 | */ | |
8efc0c15 | 102 | static volatile int received_window_change_signal = 0; |
103 | ||
104 | /* Terminal modes, as saved by enter_raw_mode. */ | |
105 | static struct termios saved_tio; | |
106 | ||
aa3378df | 107 | /* |
108 | * Flag indicating whether we are in raw mode. This is used by | |
109 | * enter_raw_mode and leave_raw_mode. | |
110 | */ | |
8efc0c15 | 111 | static int in_raw_mode = 0; |
112 | ||
113 | /* Flag indicating whether the user\'s terminal is in non-blocking mode. */ | |
114 | static int in_non_blocking_mode = 0; | |
115 | ||
116 | /* Common data for the client loop code. */ | |
2e73a022 | 117 | static int quit_pending; /* Set to non-zero to quit the client loop. */ |
118 | static int escape_char; /* Escape character. */ | |
5260325f | 119 | static int escape_pending; /* Last character was the escape character */ |
120 | static int last_was_cr; /* Last character was a newline. */ | |
121 | static int exit_status; /* Used to store the exit status of the command. */ | |
122 | static int stdin_eof; /* EOF has been encountered on standard error. */ | |
123 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
124 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
125 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
1e3b8b07 | 126 | static u_long stdin_bytes, stdout_bytes, stderr_bytes; |
127 | static u_int buffer_high;/* Soft max buffer size. */ | |
5260325f | 128 | static int connection_in; /* Connection to server (input). */ |
129 | static int connection_out; /* Connection to server (output). */ | |
c422989b | 130 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ |
8efc0c15 | 131 | |
8ce64345 | 132 | void client_init_dispatch(void); |
133 | int session_ident = -1; | |
134 | ||
e092ce67 | 135 | /*XXX*/ |
136 | extern Kex *xxx_kex; | |
137 | ||
aa3378df | 138 | /* Returns the user\'s terminal to normal mode if it had been put in raw mode. */ |
8efc0c15 | 139 | |
6ae2364d | 140 | void |
5ca51e19 | 141 | leave_raw_mode(void) |
8efc0c15 | 142 | { |
5260325f | 143 | if (!in_raw_mode) |
144 | return; | |
145 | in_raw_mode = 0; | |
146 | if (tcsetattr(fileno(stdin), TCSADRAIN, &saved_tio) < 0) | |
147 | perror("tcsetattr"); | |
8efc0c15 | 148 | |
5260325f | 149 | fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL); |
8efc0c15 | 150 | } |
151 | ||
152 | /* Puts the user\'s terminal in raw mode. */ | |
153 | ||
6ae2364d | 154 | void |
5ca51e19 | 155 | enter_raw_mode(void) |
8efc0c15 | 156 | { |
5260325f | 157 | struct termios tio; |
158 | ||
159 | if (tcgetattr(fileno(stdin), &tio) < 0) | |
160 | perror("tcgetattr"); | |
161 | saved_tio = tio; | |
162 | tio.c_iflag |= IGNPAR; | |
163 | tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF); | |
164 | tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL); | |
8efc0c15 | 165 | #ifdef IEXTEN |
5260325f | 166 | tio.c_lflag &= ~IEXTEN; |
167 | #endif /* IEXTEN */ | |
168 | tio.c_oflag &= ~OPOST; | |
169 | tio.c_cc[VMIN] = 1; | |
170 | tio.c_cc[VTIME] = 0; | |
171 | if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) < 0) | |
172 | perror("tcsetattr"); | |
173 | in_raw_mode = 1; | |
174 | ||
175 | fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL); | |
176 | } | |
8efc0c15 | 177 | |
178 | /* Restores stdin to blocking mode. */ | |
179 | ||
6ae2364d | 180 | void |
5ca51e19 | 181 | leave_non_blocking(void) |
8efc0c15 | 182 | { |
5260325f | 183 | if (in_non_blocking_mode) { |
184 | (void) fcntl(fileno(stdin), F_SETFL, 0); | |
185 | in_non_blocking_mode = 0; | |
186 | fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL); | |
187 | } | |
8efc0c15 | 188 | } |
189 | ||
5260325f | 190 | /* Puts stdin terminal in non-blocking mode. */ |
191 | ||
6ae2364d | 192 | void |
5ca51e19 | 193 | enter_non_blocking(void) |
8efc0c15 | 194 | { |
5260325f | 195 | in_non_blocking_mode = 1; |
196 | (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK); | |
197 | fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL); | |
8efc0c15 | 198 | } |
199 | ||
aa3378df | 200 | /* |
201 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
202 | * flag indicating that the window has changed. | |
203 | */ | |
8efc0c15 | 204 | |
6ae2364d | 205 | void |
5260325f | 206 | window_change_handler(int sig) |
8efc0c15 | 207 | { |
5260325f | 208 | received_window_change_signal = 1; |
209 | signal(SIGWINCH, window_change_handler); | |
8efc0c15 | 210 | } |
211 | ||
aa3378df | 212 | /* |
213 | * Signal handler for signals that cause the program to terminate. These | |
214 | * signals must be trapped to restore terminal modes. | |
215 | */ | |
8efc0c15 | 216 | |
6ae2364d | 217 | void |
5260325f | 218 | signal_handler(int sig) |
8efc0c15 | 219 | { |
5260325f | 220 | if (in_raw_mode) |
221 | leave_raw_mode(); | |
222 | if (in_non_blocking_mode) | |
223 | leave_non_blocking(); | |
224 | channel_stop_listening(); | |
225 | packet_close(); | |
226 | fatal("Killed by signal %d.", sig); | |
8efc0c15 | 227 | } |
228 | ||
aa3378df | 229 | /* |
230 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
231 | * available resolution. | |
232 | */ | |
8efc0c15 | 233 | |
6ae2364d | 234 | double |
5ca51e19 | 235 | get_current_time(void) |
8efc0c15 | 236 | { |
5260325f | 237 | struct timeval tv; |
238 | gettimeofday(&tv, NULL); | |
239 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
8efc0c15 | 240 | } |
241 | ||
aa3378df | 242 | /* |
243 | * This is called when the interactive is entered. This checks if there is | |
244 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
245 | * not appear to wake up when redirecting from /dev/null. | |
246 | */ | |
8efc0c15 | 247 | |
6ae2364d | 248 | void |
5ca51e19 | 249 | client_check_initial_eof_on_stdin(void) |
8efc0c15 | 250 | { |
5260325f | 251 | int len; |
252 | char buf[1]; | |
253 | ||
aa3378df | 254 | /* |
255 | * If standard input is to be "redirected from /dev/null", we simply | |
256 | * mark that we have seen an EOF and send an EOF message to the | |
257 | * server. Otherwise, we try to read a single character; it appears | |
258 | * that for some files, such /dev/null, select() never wakes up for | |
259 | * read for this descriptor, which means that we never get EOF. This | |
260 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
261 | */ | |
5260325f | 262 | if (stdin_null_flag) { |
263 | /* Fake EOF on stdin. */ | |
264 | debug("Sending eof."); | |
265 | stdin_eof = 1; | |
266 | packet_start(SSH_CMSG_EOF); | |
267 | packet_send(); | |
268 | } else { | |
5260325f | 269 | enter_non_blocking(); |
270 | ||
271 | /* Check for immediate EOF on stdin. */ | |
272 | len = read(fileno(stdin), buf, 1); | |
273 | if (len == 0) { | |
aa3378df | 274 | /* EOF. Record that we have seen it and send EOF to server. */ |
5260325f | 275 | debug("Sending eof."); |
276 | stdin_eof = 1; | |
277 | packet_start(SSH_CMSG_EOF); | |
278 | packet_send(); | |
279 | } else if (len > 0) { | |
aa3378df | 280 | /* |
281 | * Got data. We must store the data in the buffer, | |
282 | * and also process it as an escape character if | |
283 | * appropriate. | |
284 | */ | |
1e3b8b07 | 285 | if ((u_char) buf[0] == escape_char) |
5260325f | 286 | escape_pending = 1; |
7e8911cd | 287 | else |
5260325f | 288 | buffer_append(&stdin_buffer, buf, 1); |
5260325f | 289 | } |
5260325f | 290 | leave_non_blocking(); |
8efc0c15 | 291 | } |
8efc0c15 | 292 | } |
293 | ||
8efc0c15 | 294 | |
aa3378df | 295 | /* |
296 | * Make packets from buffered stdin data, and buffer them for sending to the | |
297 | * connection. | |
298 | */ | |
8efc0c15 | 299 | |
6ae2364d | 300 | void |
5ca51e19 | 301 | client_make_packets_from_stdin_data(void) |
8efc0c15 | 302 | { |
1e3b8b07 | 303 | u_int len; |
5260325f | 304 | |
305 | /* Send buffered stdin data to the server. */ | |
306 | while (buffer_len(&stdin_buffer) > 0 && | |
307 | packet_not_very_much_data_to_write()) { | |
308 | len = buffer_len(&stdin_buffer); | |
309 | /* Keep the packets at reasonable size. */ | |
310 | if (len > packet_get_maxsize()) | |
311 | len = packet_get_maxsize(); | |
312 | packet_start(SSH_CMSG_STDIN_DATA); | |
313 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
314 | packet_send(); | |
315 | buffer_consume(&stdin_buffer, len); | |
7e8911cd | 316 | stdin_bytes += len; |
5260325f | 317 | /* If we have a pending EOF, send it now. */ |
318 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
319 | packet_start(SSH_CMSG_EOF); | |
320 | packet_send(); | |
321 | } | |
8efc0c15 | 322 | } |
8efc0c15 | 323 | } |
324 | ||
aa3378df | 325 | /* |
326 | * Checks if the client window has changed, and sends a packet about it to | |
327 | * the server if so. The actual change is detected elsewhere (by a software | |
328 | * interrupt on Unix); this just checks the flag and sends a message if | |
329 | * appropriate. | |
330 | */ | |
8efc0c15 | 331 | |
6ae2364d | 332 | void |
5ca51e19 | 333 | client_check_window_change(void) |
8efc0c15 | 334 | { |
8ce64345 | 335 | struct winsize ws; |
336 | ||
337 | if (! received_window_change_signal) | |
338 | return; | |
339 | /** XXX race */ | |
340 | received_window_change_signal = 0; | |
341 | ||
342 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
343 | return; | |
344 | ||
de273eef | 345 | debug2("client_check_window_change: changed"); |
8ce64345 | 346 | |
347 | if (compat20) { | |
348 | channel_request_start(session_ident, "window-change", 0); | |
349 | packet_put_int(ws.ws_col); | |
350 | packet_put_int(ws.ws_row); | |
351 | packet_put_int(ws.ws_xpixel); | |
352 | packet_put_int(ws.ws_ypixel); | |
353 | packet_send(); | |
354 | } else { | |
355 | packet_start(SSH_CMSG_WINDOW_SIZE); | |
356 | packet_put_int(ws.ws_row); | |
357 | packet_put_int(ws.ws_col); | |
358 | packet_put_int(ws.ws_xpixel); | |
359 | packet_put_int(ws.ws_ypixel); | |
360 | packet_send(); | |
8efc0c15 | 361 | } |
8efc0c15 | 362 | } |
363 | ||
aa3378df | 364 | /* |
365 | * Waits until the client can do something (some data becomes available on | |
366 | * one of the file descriptors). | |
367 | */ | |
8efc0c15 | 368 | |
6ae2364d | 369 | void |
39929cdb | 370 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
c422989b | 371 | int *maxfdp, int rekeying) |
8efc0c15 | 372 | { |
39929cdb | 373 | /* Add any selections by the channel mechanism. */ |
c422989b | 374 | channel_prepare_select(readsetp, writesetp, maxfdp, rekeying); |
5260325f | 375 | |
8ce64345 | 376 | if (!compat20) { |
377 | /* Read from the connection, unless our buffers are full. */ | |
378 | if (buffer_len(&stdout_buffer) < buffer_high && | |
379 | buffer_len(&stderr_buffer) < buffer_high && | |
380 | channel_not_very_much_buffered_data()) | |
39929cdb | 381 | FD_SET(connection_in, *readsetp); |
8ce64345 | 382 | /* |
383 | * Read from stdin, unless we have seen EOF or have very much | |
384 | * buffered data to send to the server. | |
385 | */ | |
386 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
39929cdb | 387 | FD_SET(fileno(stdin), *readsetp); |
8ce64345 | 388 | |
389 | /* Select stdout/stderr if have data in buffer. */ | |
390 | if (buffer_len(&stdout_buffer) > 0) | |
39929cdb | 391 | FD_SET(fileno(stdout), *writesetp); |
8ce64345 | 392 | if (buffer_len(&stderr_buffer) > 0) |
39929cdb | 393 | FD_SET(fileno(stderr), *writesetp); |
8ce64345 | 394 | } else { |
39929cdb | 395 | FD_SET(connection_in, *readsetp); |
8ce64345 | 396 | } |
5260325f | 397 | |
5260325f | 398 | /* Select server connection if have data to write to the server. */ |
399 | if (packet_have_data_to_write()) | |
39929cdb | 400 | FD_SET(connection_out, *writesetp); |
5260325f | 401 | |
aa3378df | 402 | /* |
403 | * Wait for something to happen. This will suspend the process until | |
404 | * some selected descriptor can be read, written, or has some other | |
405 | * event pending. Note: if you want to implement SSH_MSG_IGNORE | |
406 | * messages to fool traffic analysis, this might be the place to do | |
407 | * it: just have a random timeout for the select, and send a random | |
408 | * SSH_MSG_IGNORE packet when the timeout expires. | |
409 | */ | |
5260325f | 410 | |
39929cdb | 411 | if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) { |
5260325f | 412 | char buf[100]; |
fd193ca4 | 413 | |
414 | /* | |
415 | * We have to clear the select masks, because we return. | |
416 | * We have to return, because the mainloop checks for the flags | |
417 | * set by the signal handlers. | |
418 | */ | |
419 | memset(*readsetp, 0, *maxfdp); | |
420 | memset(*writesetp, 0, *maxfdp); | |
421 | ||
5260325f | 422 | if (errno == EINTR) |
423 | return; | |
424 | /* Note: we might still have data in the buffers. */ | |
425 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
426 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 427 | quit_pending = 1; |
428 | } | |
8efc0c15 | 429 | } |
430 | ||
6ae2364d | 431 | void |
2e73a022 | 432 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
8efc0c15 | 433 | { |
5260325f | 434 | struct winsize oldws, newws; |
435 | ||
436 | /* Flush stdout and stderr buffers. */ | |
2e73a022 | 437 | if (buffer_len(bout) > 0) |
438 | atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); | |
439 | if (buffer_len(berr) > 0) | |
440 | atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); | |
5260325f | 441 | |
5260325f | 442 | leave_raw_mode(); |
443 | ||
aa3378df | 444 | /* |
445 | * Free (and clear) the buffer to reduce the amount of data that gets | |
446 | * written to swap. | |
447 | */ | |
2e73a022 | 448 | buffer_free(bin); |
449 | buffer_free(bout); | |
450 | buffer_free(berr); | |
5260325f | 451 | |
452 | /* Save old window size. */ | |
453 | ioctl(fileno(stdin), TIOCGWINSZ, &oldws); | |
454 | ||
455 | /* Send the suspend signal to the program itself. */ | |
456 | kill(getpid(), SIGTSTP); | |
457 | ||
458 | /* Check if the window size has changed. */ | |
459 | if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 && | |
460 | (oldws.ws_row != newws.ws_row || | |
461 | oldws.ws_col != newws.ws_col || | |
462 | oldws.ws_xpixel != newws.ws_xpixel || | |
463 | oldws.ws_ypixel != newws.ws_ypixel)) | |
464 | received_window_change_signal = 1; | |
465 | ||
466 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
2e73a022 | 467 | buffer_init(bin); |
468 | buffer_init(bout); | |
469 | buffer_init(berr); | |
5260325f | 470 | |
5260325f | 471 | enter_raw_mode(); |
8efc0c15 | 472 | } |
473 | ||
6ae2364d | 474 | void |
8ce64345 | 475 | client_process_net_input(fd_set * readset) |
8efc0c15 | 476 | { |
8ce64345 | 477 | int len; |
478 | char buf[8192]; | |
5260325f | 479 | |
aa3378df | 480 | /* |
481 | * Read input from the server, and add any such data to the buffer of | |
482 | * the packet subsystem. | |
483 | */ | |
5260325f | 484 | if (FD_ISSET(connection_in, readset)) { |
485 | /* Read as much as possible. */ | |
486 | len = read(connection_in, buf, sizeof(buf)); | |
487 | if (len == 0) { | |
488 | /* Received EOF. The remote host has closed the connection. */ | |
489 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
490 | host); | |
8efc0c15 | 491 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
8efc0c15 | 492 | quit_pending = 1; |
493 | return; | |
5260325f | 494 | } |
aa3378df | 495 | /* |
496 | * There is a kernel bug on Solaris that causes select to | |
497 | * sometimes wake up even though there is no data available. | |
498 | */ | |
09cb311c | 499 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
5260325f | 500 | len = 0; |
501 | ||
502 | if (len < 0) { | |
503 | /* An error has encountered. Perhaps there is a network problem. */ | |
504 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
505 | host, strerror(errno)); | |
506 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 507 | quit_pending = 1; |
508 | return; | |
509 | } | |
510 | packet_process_incoming(buf, len); | |
511 | } | |
8ce64345 | 512 | } |
513 | ||
2e73a022 | 514 | /* process the characters one by one */ |
515 | int | |
516 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) | |
517 | { | |
518 | char string[1024]; | |
519 | pid_t pid; | |
520 | int bytes = 0; | |
1e3b8b07 | 521 | u_int i; |
522 | u_char ch; | |
2e73a022 | 523 | char *s; |
524 | ||
525 | for (i = 0; i < len; i++) { | |
526 | /* Get one character at a time. */ | |
527 | ch = buf[i]; | |
528 | ||
529 | if (escape_pending) { | |
530 | /* We have previously seen an escape character. */ | |
531 | /* Clear the flag now. */ | |
532 | escape_pending = 0; | |
533 | ||
534 | /* Process the escaped character. */ | |
535 | switch (ch) { | |
536 | case '.': | |
537 | /* Terminate the connection. */ | |
538 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
539 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 540 | |
541 | quit_pending = 1; | |
542 | return -1; | |
543 | ||
544 | case 'Z' - 64: | |
545 | /* Suspend the program. */ | |
546 | /* Print a message to that effect to the user. */ | |
547 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
548 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 549 | |
550 | /* Restore terminal modes and suspend. */ | |
551 | client_suspend_self(bin, bout, berr); | |
552 | ||
553 | /* We have been continued. */ | |
554 | continue; | |
555 | ||
e092ce67 | 556 | case 'R': |
c422989b | 557 | if (compat20) |
558 | need_rekeying = 1; | |
e092ce67 | 559 | continue; |
560 | ||
2e73a022 | 561 | case '&': |
562 | /* XXX does not work yet with proto 2 */ | |
563 | if (compat20) | |
564 | continue; | |
565 | /* | |
566 | * Detach the program (continue to serve connections, | |
567 | * but put in background and no more new connections). | |
568 | */ | |
569 | if (!stdin_eof) { | |
570 | /* | |
571 | * Sending SSH_CMSG_EOF alone does not always appear | |
572 | * to be enough. So we try to send an EOF character | |
573 | * first. | |
574 | */ | |
575 | packet_start(SSH_CMSG_STDIN_DATA); | |
576 | packet_put_string("\004", 1); | |
577 | packet_send(); | |
578 | /* Close stdin. */ | |
579 | stdin_eof = 1; | |
580 | if (buffer_len(bin) == 0) { | |
581 | packet_start(SSH_CMSG_EOF); | |
582 | packet_send(); | |
583 | } | |
584 | } | |
585 | /* Restore tty modes. */ | |
586 | leave_raw_mode(); | |
587 | ||
588 | /* Stop listening for new connections. */ | |
589 | channel_stop_listening(); | |
590 | ||
591 | printf("%c& [backgrounded]\n", escape_char); | |
592 | ||
593 | /* Fork into background. */ | |
594 | pid = fork(); | |
595 | if (pid < 0) { | |
596 | error("fork: %.100s", strerror(errno)); | |
597 | continue; | |
598 | } | |
599 | if (pid != 0) { /* This is the parent. */ | |
600 | /* The parent just exits. */ | |
601 | exit(0); | |
602 | } | |
603 | /* The child continues serving connections. */ | |
604 | continue; /*XXX ? */ | |
605 | ||
606 | case '?': | |
607 | snprintf(string, sizeof string, | |
608 | "%c?\r\n\ | |
609 | Supported escape sequences:\r\n\ | |
610 | ~. - terminate connection\r\n\ | |
611 | ~^Z - suspend ssh\r\n\ | |
612 | ~# - list forwarded connections\r\n\ | |
613 | ~& - background ssh (when waiting for connections to terminate)\r\n\ | |
614 | ~? - this message\r\n\ | |
615 | ~~ - send the escape character by typing it twice\r\n\ | |
616 | (Note that escapes are only recognized immediately after newline.)\r\n", | |
617 | escape_char); | |
618 | buffer_append(berr, string, strlen(string)); | |
619 | continue; | |
620 | ||
621 | case '#': | |
622 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
623 | buffer_append(berr, string, strlen(string)); | |
624 | s = channel_open_message(); | |
625 | buffer_append(berr, s, strlen(s)); | |
626 | xfree(s); | |
627 | continue; | |
628 | ||
629 | default: | |
630 | if (ch != escape_char) { | |
631 | buffer_put_char(bin, escape_char); | |
632 | bytes++; | |
633 | } | |
634 | /* Escaped characters fall through here */ | |
635 | break; | |
636 | } | |
637 | } else { | |
638 | /* | |
639 | * The previous character was not an escape char. Check if this | |
640 | * is an escape. | |
641 | */ | |
642 | if (last_was_cr && ch == escape_char) { | |
643 | /* It is. Set the flag and continue to next character. */ | |
644 | escape_pending = 1; | |
645 | continue; | |
646 | } | |
647 | } | |
648 | ||
649 | /* | |
650 | * Normal character. Record whether it was a newline, | |
651 | * and append it to the buffer. | |
652 | */ | |
653 | last_was_cr = (ch == '\r' || ch == '\n'); | |
654 | buffer_put_char(bin, ch); | |
655 | bytes++; | |
656 | } | |
657 | return bytes; | |
658 | } | |
659 | ||
6ae2364d | 660 | void |
8ce64345 | 661 | client_process_input(fd_set * readset) |
662 | { | |
9da5c3c9 | 663 | int len; |
2e73a022 | 664 | char buf[8192]; |
8ce64345 | 665 | |
5260325f | 666 | /* Read input from stdin. */ |
667 | if (FD_ISSET(fileno(stdin), readset)) { | |
668 | /* Read as much as possible. */ | |
669 | len = read(fileno(stdin), buf, sizeof(buf)); | |
670 | if (len <= 0) { | |
aa3378df | 671 | /* |
672 | * Received EOF or error. They are treated | |
673 | * similarly, except that an error message is printed | |
674 | * if it was an error condition. | |
675 | */ | |
5260325f | 676 | if (len < 0) { |
677 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
678 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 679 | } |
680 | /* Mark that we have seen EOF. */ | |
681 | stdin_eof = 1; | |
aa3378df | 682 | /* |
683 | * Send an EOF message to the server unless there is | |
684 | * data in the buffer. If there is data in the | |
685 | * buffer, no message will be sent now. Code | |
686 | * elsewhere will send the EOF when the buffer | |
687 | * becomes empty if stdin_eof is set. | |
688 | */ | |
5260325f | 689 | if (buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 690 | packet_start(SSH_CMSG_EOF); |
691 | packet_send(); | |
5260325f | 692 | } |
693 | } else if (escape_char == -1) { | |
aa3378df | 694 | /* |
695 | * Normal successful read, and no escape character. | |
696 | * Just append the data to buffer. | |
697 | */ | |
5260325f | 698 | buffer_append(&stdin_buffer, buf, len); |
5260325f | 699 | } else { |
aa3378df | 700 | /* |
701 | * Normal, successful read. But we have an escape character | |
702 | * and have to process the characters one by one. | |
703 | */ | |
7e8911cd | 704 | if (process_escapes(&stdin_buffer, &stdout_buffer, |
705 | &stderr_buffer, buf, len) == -1) | |
2e73a022 | 706 | return; |
5260325f | 707 | } |
708 | } | |
8efc0c15 | 709 | } |
710 | ||
6ae2364d | 711 | void |
5260325f | 712 | client_process_output(fd_set * writeset) |
8efc0c15 | 713 | { |
5260325f | 714 | int len; |
715 | char buf[100]; | |
716 | ||
717 | /* Write buffered output to stdout. */ | |
718 | if (FD_ISSET(fileno(stdout), writeset)) { | |
719 | /* Write as much data as possible. */ | |
720 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 721 | buffer_len(&stdout_buffer)); |
5260325f | 722 | if (len <= 0) { |
723 | if (errno == EAGAIN) | |
724 | len = 0; | |
725 | else { | |
aa3378df | 726 | /* |
727 | * An error or EOF was encountered. Put an | |
728 | * error message to stderr buffer. | |
729 | */ | |
5260325f | 730 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
731 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 732 | quit_pending = 1; |
733 | return; | |
734 | } | |
735 | } | |
736 | /* Consume printed data from the buffer. */ | |
737 | buffer_consume(&stdout_buffer, len); | |
7e8911cd | 738 | stdout_bytes += len; |
5260325f | 739 | } |
740 | /* Write buffered output to stderr. */ | |
741 | if (FD_ISSET(fileno(stderr), writeset)) { | |
742 | /* Write as much data as possible. */ | |
743 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 744 | buffer_len(&stderr_buffer)); |
5260325f | 745 | if (len <= 0) { |
746 | if (errno == EAGAIN) | |
747 | len = 0; | |
748 | else { | |
aa3378df | 749 | /* EOF or error, but can't even print error message. */ |
5260325f | 750 | quit_pending = 1; |
751 | return; | |
752 | } | |
753 | } | |
754 | /* Consume printed characters from the buffer. */ | |
755 | buffer_consume(&stderr_buffer, len); | |
7e8911cd | 756 | stderr_bytes += len; |
8efc0c15 | 757 | } |
8efc0c15 | 758 | } |
759 | ||
7368a6c8 | 760 | /* |
761 | * Get packets from the connection input buffer, and process them as long as | |
762 | * there are packets available. | |
763 | * | |
764 | * Any unknown packets received during the actual | |
765 | * session cause the session to terminate. This is | |
766 | * intended to make debugging easier since no | |
767 | * confirmations are sent. Any compatible protocol | |
768 | * extensions must be negotiated during the | |
769 | * preparatory phase. | |
770 | */ | |
771 | ||
6ae2364d | 772 | void |
5ca51e19 | 773 | client_process_buffered_input_packets(void) |
7368a6c8 | 774 | { |
e092ce67 | 775 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); |
7368a6c8 | 776 | } |
777 | ||
2e73a022 | 778 | /* scan buf[] for '~' before sending data to the peer */ |
779 | ||
780 | int | |
781 | simple_escape_filter(Channel *c, char *buf, int len) | |
782 | { | |
783 | /* XXX we assume c->extended is writeable */ | |
784 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
785 | } | |
786 | ||
aa3378df | 787 | /* |
788 | * Implements the interactive session with the server. This is called after | |
789 | * the user has been authenticated, and a command has been started on the | |
790 | * remote host. If escape_char != -1, it is the character used as an escape | |
791 | * character for terminating or suspending the session. | |
792 | */ | |
8efc0c15 | 793 | |
6ae2364d | 794 | int |
2e73a022 | 795 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
8efc0c15 | 796 | { |
39929cdb | 797 | fd_set *readset = NULL, *writeset = NULL; |
5260325f | 798 | double start_time, total_time; |
c422989b | 799 | int max_fd = 0, len, rekeying = 0; |
5260325f | 800 | char buf[100]; |
801 | ||
802 | debug("Entering interactive session."); | |
803 | ||
804 | start_time = get_current_time(); | |
805 | ||
806 | /* Initialize variables. */ | |
807 | escape_pending = 0; | |
808 | last_was_cr = 1; | |
809 | exit_status = -1; | |
810 | stdin_eof = 0; | |
811 | buffer_high = 64 * 1024; | |
812 | connection_in = packet_get_connection_in(); | |
813 | connection_out = packet_get_connection_out(); | |
39929cdb | 814 | max_fd = MAX(connection_in, connection_out); |
815 | ||
816 | if (!compat20) { | |
817 | max_fd = MAX(max_fd, fileno(stdin)); | |
818 | max_fd = MAX(max_fd, fileno(stdout)); | |
819 | max_fd = MAX(max_fd, fileno(stderr)); | |
820 | } | |
5260325f | 821 | stdin_bytes = 0; |
822 | stdout_bytes = 0; | |
823 | stderr_bytes = 0; | |
824 | quit_pending = 0; | |
825 | escape_char = escape_char_arg; | |
826 | ||
827 | /* Initialize buffers. */ | |
828 | buffer_init(&stdin_buffer); | |
829 | buffer_init(&stdout_buffer); | |
830 | buffer_init(&stderr_buffer); | |
831 | ||
7368a6c8 | 832 | client_init_dispatch(); |
833 | ||
5260325f | 834 | /* Set signal handlers to restore non-blocking mode. */ |
835 | signal(SIGINT, signal_handler); | |
836 | signal(SIGQUIT, signal_handler); | |
837 | signal(SIGTERM, signal_handler); | |
838 | signal(SIGPIPE, SIG_IGN); | |
839 | if (have_pty) | |
840 | signal(SIGWINCH, window_change_handler); | |
841 | ||
5260325f | 842 | if (have_pty) |
843 | enter_raw_mode(); | |
844 | ||
1fc8ccdf | 845 | if (compat20) { |
846 | session_ident = ssh2_chan_id; | |
847 | if (escape_char != -1) | |
848 | channel_register_filter(session_ident, | |
849 | simple_escape_filter); | |
850 | } else { | |
851 | /* Check if we should immediately send eof on stdin. */ | |
8ce64345 | 852 | client_check_initial_eof_on_stdin(); |
1fc8ccdf | 853 | } |
2e73a022 | 854 | |
5260325f | 855 | /* Main loop of the client for the interactive session mode. */ |
856 | while (!quit_pending) { | |
5260325f | 857 | |
aa3378df | 858 | /* Process buffered packets sent by the server. */ |
5260325f | 859 | client_process_buffered_input_packets(); |
860 | ||
c422989b | 861 | rekeying = (xxx_kex != NULL && !xxx_kex->done); |
862 | ||
8ce64345 | 863 | if (compat20 && !channel_still_open()) { |
de273eef | 864 | debug2("!channel_still_open."); |
8ce64345 | 865 | break; |
866 | } | |
867 | ||
c422989b | 868 | if (rekeying) { |
869 | debug("rekeying in progress"); | |
870 | } else { | |
871 | /* | |
872 | * Make packets of buffered stdin data, and buffer | |
873 | * them for sending to the server. | |
874 | */ | |
875 | if (!compat20) | |
876 | client_make_packets_from_stdin_data(); | |
5260325f | 877 | |
c422989b | 878 | /* |
879 | * Make packets from buffered channel data, and | |
880 | * enqueue them for sending to the server. | |
881 | */ | |
882 | if (packet_not_very_much_data_to_write()) | |
883 | channel_output_poll(); | |
5260325f | 884 | |
c422989b | 885 | /* |
886 | * Check if the window size has changed, and buffer a | |
887 | * message about it to the server if so. | |
888 | */ | |
889 | client_check_window_change(); | |
5260325f | 890 | |
c422989b | 891 | if (quit_pending) |
892 | break; | |
893 | } | |
aa3378df | 894 | /* |
895 | * Wait until we have something to do (something becomes | |
896 | * available on one of the descriptors). | |
897 | */ | |
c422989b | 898 | client_wait_until_can_do_something(&readset, &writeset, |
899 | &max_fd, rekeying); | |
5260325f | 900 | |
901 | if (quit_pending) | |
902 | break; | |
903 | ||
c422989b | 904 | /* Do channel operations unless rekeying in progress. */ |
905 | if (!rekeying) { | |
906 | channel_after_select(readset, writeset); | |
907 | ||
908 | if (need_rekeying) { | |
909 | debug("user requests rekeying"); | |
910 | xxx_kex->done = 0; | |
911 | kex_send_kexinit(xxx_kex); | |
912 | need_rekeying = 0; | |
913 | } | |
914 | } | |
5260325f | 915 | |
8ce64345 | 916 | /* Buffer input from the connection. */ |
39929cdb | 917 | client_process_net_input(readset); |
5260325f | 918 | |
8ce64345 | 919 | if (quit_pending) |
920 | break; | |
921 | ||
922 | if (!compat20) { | |
923 | /* Buffer data from stdin */ | |
39929cdb | 924 | client_process_input(readset); |
8ce64345 | 925 | /* |
926 | * Process output to stdout and stderr. Output to | |
927 | * the connection is processed elsewhere (above). | |
928 | */ | |
39929cdb | 929 | client_process_output(writeset); |
8ce64345 | 930 | } |
5260325f | 931 | |
aa3378df | 932 | /* Send as much buffered packet data as possible to the sender. */ |
39929cdb | 933 | if (FD_ISSET(connection_out, writeset)) |
5260325f | 934 | packet_write_poll(); |
935 | } | |
39929cdb | 936 | if (readset) |
937 | xfree(readset); | |
938 | if (writeset) | |
939 | xfree(writeset); | |
5260325f | 940 | |
941 | /* Terminate the session. */ | |
942 | ||
943 | /* Stop watching for window change. */ | |
944 | if (have_pty) | |
945 | signal(SIGWINCH, SIG_DFL); | |
946 | ||
947 | /* Stop listening for connections. */ | |
948 | channel_stop_listening(); | |
949 | ||
aa3378df | 950 | /* |
951 | * In interactive mode (with pseudo tty) display a message indicating | |
952 | * that the connection has been closed. | |
953 | */ | |
5260325f | 954 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { |
955 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
956 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
8efc0c15 | 957 | } |
5260325f | 958 | /* Output any buffered data for stdout. */ |
959 | while (buffer_len(&stdout_buffer) > 0) { | |
960 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 961 | buffer_len(&stdout_buffer)); |
5260325f | 962 | if (len <= 0) { |
963 | error("Write failed flushing stdout buffer."); | |
964 | break; | |
965 | } | |
966 | buffer_consume(&stdout_buffer, len); | |
7e8911cd | 967 | stdout_bytes += len; |
8efc0c15 | 968 | } |
5260325f | 969 | |
970 | /* Output any buffered data for stderr. */ | |
971 | while (buffer_len(&stderr_buffer) > 0) { | |
972 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 973 | buffer_len(&stderr_buffer)); |
5260325f | 974 | if (len <= 0) { |
975 | error("Write failed flushing stderr buffer."); | |
976 | break; | |
977 | } | |
978 | buffer_consume(&stderr_buffer, len); | |
7e8911cd | 979 | stderr_bytes += len; |
5260325f | 980 | } |
981 | ||
5260325f | 982 | if (have_pty) |
983 | leave_raw_mode(); | |
984 | ||
985 | /* Clear and free any buffers. */ | |
986 | memset(buf, 0, sizeof(buf)); | |
987 | buffer_free(&stdin_buffer); | |
988 | buffer_free(&stdout_buffer); | |
989 | buffer_free(&stderr_buffer); | |
990 | ||
991 | /* Report bytes transferred, and transfer rates. */ | |
992 | total_time = get_current_time() - start_time; | |
993 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
994 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); | |
995 | if (total_time > 0) | |
996 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
997 | stdin_bytes / total_time, stdout_bytes / total_time, | |
998 | stderr_bytes / total_time); | |
999 | ||
1000 | /* Return the exit status of the program. */ | |
1001 | debug("Exit status %d", exit_status); | |
1002 | return exit_status; | |
8efc0c15 | 1003 | } |
7368a6c8 | 1004 | |
1005 | /*********/ | |
1006 | ||
1007 | void | |
188adeb2 | 1008 | client_input_stdout_data(int type, int plen, void *ctxt) |
7368a6c8 | 1009 | { |
1e3b8b07 | 1010 | u_int data_len; |
7368a6c8 | 1011 | char *data = packet_get_string(&data_len); |
1012 | packet_integrity_check(plen, 4 + data_len, type); | |
1013 | buffer_append(&stdout_buffer, data, data_len); | |
7368a6c8 | 1014 | memset(data, 0, data_len); |
1015 | xfree(data); | |
1016 | } | |
1017 | void | |
188adeb2 | 1018 | client_input_stderr_data(int type, int plen, void *ctxt) |
7368a6c8 | 1019 | { |
1e3b8b07 | 1020 | u_int data_len; |
7368a6c8 | 1021 | char *data = packet_get_string(&data_len); |
1022 | packet_integrity_check(plen, 4 + data_len, type); | |
1023 | buffer_append(&stderr_buffer, data, data_len); | |
7368a6c8 | 1024 | memset(data, 0, data_len); |
1025 | xfree(data); | |
1026 | } | |
1027 | void | |
188adeb2 | 1028 | client_input_exit_status(int type, int plen, void *ctxt) |
7368a6c8 | 1029 | { |
1030 | packet_integrity_check(plen, 4, type); | |
1031 | exit_status = packet_get_int(); | |
1032 | /* Acknowledge the exit. */ | |
1033 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1034 | packet_send(); | |
1035 | /* | |
1036 | * Must wait for packet to be sent since we are | |
1037 | * exiting the loop. | |
1038 | */ | |
1039 | packet_write_wait(); | |
1040 | /* Flag that we want to exit. */ | |
1041 | quit_pending = 1; | |
1042 | } | |
1043 | ||
fa08c86b | 1044 | Channel * |
1045 | client_request_forwarded_tcpip(const char *request_type, int rchan) | |
1046 | { | |
1047 | Channel* c = NULL; | |
1048 | char *listen_address, *originator_address; | |
1049 | int listen_port, originator_port; | |
1050 | int sock, newch; | |
1051 | ||
1052 | /* Get rest of the packet */ | |
1053 | listen_address = packet_get_string(NULL); | |
1054 | listen_port = packet_get_int(); | |
1055 | originator_address = packet_get_string(NULL); | |
1056 | originator_port = packet_get_int(); | |
1057 | packet_done(); | |
1058 | ||
1059 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", | |
1060 | listen_address, listen_port, originator_address, originator_port); | |
1061 | ||
1062 | sock = channel_connect_by_listen_adress(listen_port); | |
1063 | if (sock >= 0) { | |
1064 | newch = channel_new("forwarded-tcpip", | |
97fb6912 | 1065 | SSH_CHANNEL_CONNECTING, sock, sock, -1, |
fa08c86b | 1066 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, |
1067 | xstrdup(originator_address), 1); | |
1068 | c = channel_lookup(newch); | |
1069 | } | |
1070 | xfree(originator_address); | |
1071 | xfree(listen_address); | |
1072 | return c; | |
1073 | } | |
1074 | ||
1075 | Channel* | |
1076 | client_request_x11(const char *request_type, int rchan) | |
1077 | { | |
1078 | Channel *c = NULL; | |
1079 | char *originator; | |
1080 | int originator_port; | |
1081 | int sock, newch; | |
1082 | ||
1083 | if (!options.forward_x11) { | |
1084 | error("Warning: ssh server tried X11 forwarding."); | |
1085 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1086 | return NULL; | |
1087 | } | |
1088 | originator = packet_get_string(NULL); | |
1089 | if (datafellows & SSH_BUG_X11FWD) { | |
1090 | debug2("buggy server: x11 request w/o originator_port"); | |
1091 | originator_port = 0; | |
1092 | } else { | |
1093 | originator_port = packet_get_int(); | |
1094 | } | |
1095 | packet_done(); | |
1096 | /* XXX check permission */ | |
865ac82e | 1097 | debug("client_request_x11: request from %s %d", originator, |
1098 | originator_port); | |
fa08c86b | 1099 | sock = x11_connect_display(); |
1100 | if (sock >= 0) { | |
1101 | newch = channel_new("x11", | |
1102 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
1103 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, | |
1104 | xstrdup("x11"), 1); | |
1105 | c = channel_lookup(newch); | |
1106 | } | |
1107 | xfree(originator); | |
1108 | return c; | |
1109 | } | |
1110 | ||
1111 | Channel* | |
1112 | client_request_agent(const char *request_type, int rchan) | |
1113 | { | |
1114 | Channel *c = NULL; | |
1115 | int sock, newch; | |
1116 | ||
1117 | if (!options.forward_agent) { | |
1118 | error("Warning: ssh server tried agent forwarding."); | |
1119 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1120 | return NULL; | |
1121 | } | |
1122 | sock = ssh_get_authentication_socket(); | |
1123 | if (sock >= 0) { | |
1124 | newch = channel_new("authentication agent connection", | |
1125 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1126 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
1127 | xstrdup("authentication agent connection"), 1); | |
1128 | c = channel_lookup(newch); | |
1129 | } | |
1130 | return c; | |
1131 | } | |
1132 | ||
0b242b12 | 1133 | /* XXXX move to generic input handler */ |
1134 | void | |
188adeb2 | 1135 | client_input_channel_open(int type, int plen, void *ctxt) |
0b242b12 | 1136 | { |
1137 | Channel *c = NULL; | |
1138 | char *ctype; | |
1e3b8b07 | 1139 | u_int len; |
0b242b12 | 1140 | int rchan; |
1141 | int rmaxpack; | |
1142 | int rwindow; | |
1143 | ||
1144 | ctype = packet_get_string(&len); | |
1145 | rchan = packet_get_int(); | |
1146 | rwindow = packet_get_int(); | |
1147 | rmaxpack = packet_get_int(); | |
1148 | ||
1d1ffb87 | 1149 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
0b242b12 | 1150 | ctype, rchan, rwindow, rmaxpack); |
1151 | ||
fa08c86b | 1152 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
1153 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1154 | } else if (strcmp(ctype, "x11") == 0) { | |
1155 | c = client_request_x11(ctype, rchan); | |
1156 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1157 | c = client_request_agent(ctype, rchan); | |
0b242b12 | 1158 | } |
1159 | /* XXX duplicate : */ | |
1160 | if (c != NULL) { | |
1161 | debug("confirm %s", ctype); | |
1162 | c->remote_id = rchan; | |
1163 | c->remote_window = rwindow; | |
1164 | c->remote_maxpacket = rmaxpack; | |
1165 | ||
1166 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1167 | packet_put_int(c->remote_id); | |
1168 | packet_put_int(c->self); | |
1169 | packet_put_int(c->local_window); | |
1170 | packet_put_int(c->local_maxpacket); | |
1171 | packet_send(); | |
1172 | } else { | |
1173 | debug("failure %s", ctype); | |
1174 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1175 | packet_put_int(rchan); | |
1176 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
1177 | packet_put_cstring("bla bla"); | |
1178 | packet_put_cstring(""); | |
1179 | packet_send(); | |
1180 | } | |
1181 | xfree(ctype); | |
1182 | } | |
1fc8ccdf | 1183 | void |
1184 | client_input_channel_req(int type, int plen, void *ctxt) | |
1185 | { | |
1186 | Channel *c = NULL; | |
1187 | int id, reply, success = 0; | |
1188 | char *rtype; | |
1189 | ||
1190 | id = packet_get_int(); | |
1191 | rtype = packet_get_string(NULL); | |
1192 | reply = packet_get_char(); | |
1193 | ||
1194 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1195 | id, rtype, reply); | |
1196 | ||
1197 | if (session_ident == -1) { | |
1198 | error("client_input_channel_req: no channel %d", session_ident); | |
1199 | } else if (id != session_ident) { | |
1200 | error("client_input_channel_req: channel %d: wrong channel: %d", | |
1201 | session_ident, id); | |
1202 | } | |
1203 | c = channel_lookup(id); | |
1204 | if (c == NULL) { | |
1205 | error("client_input_channel_req: channel %d: unknown channel", id); | |
1206 | } else if (strcmp(rtype, "exit-status") == 0) { | |
1207 | success = 1; | |
1208 | exit_status = packet_get_int(); | |
1209 | packet_done(); | |
1210 | } | |
1211 | if (reply) { | |
1212 | packet_start(success ? | |
1213 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1214 | packet_put_int(c->remote_id); | |
1215 | packet_send(); | |
1216 | } | |
1217 | xfree(rtype); | |
1218 | } | |
0b242b12 | 1219 | |
6ae2364d | 1220 | void |
5ca51e19 | 1221 | client_init_dispatch_20(void) |
8ce64345 | 1222 | { |
7a37c112 | 1223 | dispatch_init(&dispatch_protocol_error); |
8ce64345 | 1224 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
1225 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1226 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1227 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
0b242b12 | 1228 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
8ce64345 | 1229 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1230 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1fc8ccdf | 1231 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
8ce64345 | 1232 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
7a37c112 | 1233 | |
1234 | /* rekeying */ | |
1235 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
8ce64345 | 1236 | } |
6ae2364d | 1237 | void |
5ca51e19 | 1238 | client_init_dispatch_13(void) |
7368a6c8 | 1239 | { |
1240 | dispatch_init(NULL); | |
1241 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1242 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1243 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
7368a6c8 | 1244 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1245 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1246 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
7368a6c8 | 1247 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
1248 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1249 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
a22aff1f | 1250 | |
1251 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
1252 | &auth_input_open_request : &deny_input_open); | |
1253 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? | |
1254 | &x11_input_open : &deny_input_open); | |
7368a6c8 | 1255 | } |
6ae2364d | 1256 | void |
5ca51e19 | 1257 | client_init_dispatch_15(void) |
7368a6c8 | 1258 | { |
1259 | client_init_dispatch_13(); | |
1260 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1261 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1262 | } | |
6ae2364d | 1263 | void |
5ca51e19 | 1264 | client_init_dispatch(void) |
7368a6c8 | 1265 | { |
8ce64345 | 1266 | if (compat20) |
1267 | client_init_dispatch_20(); | |
1268 | else if (compat13) | |
7368a6c8 | 1269 | client_init_dispatch_13(); |
1270 | else | |
1271 | client_init_dispatch_15(); | |
1272 | } |