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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" | |
188adeb2 | 62 | RCSID("$OpenBSD: clientloop.c,v 1.36 2000/09/21 11:25:33 markus Exp $"); |
8efc0c15 | 63 | |
64 | #include "xmalloc.h" | |
65 | #include "ssh.h" | |
66 | #include "packet.h" | |
67 | #include "buffer.h" | |
6a17f9c2 | 68 | #include "readconf.h" |
8efc0c15 | 69 | |
8ce64345 | 70 | #include "ssh2.h" |
7368a6c8 | 71 | #include "compat.h" |
72 | #include "channels.h" | |
73 | #include "dispatch.h" | |
74 | ||
2e73a022 | 75 | #include "buffer.h" |
76 | #include "bufaux.h" | |
77 | ||
8efc0c15 | 78 | /* Flag indicating that stdin should be redirected from /dev/null. */ |
79 | extern int stdin_null_flag; | |
80 | ||
aa3378df | 81 | /* |
82 | * Name of the host we are connecting to. This is the name given on the | |
83 | * command line, or the HostName specified for the user-supplied name in a | |
84 | * configuration file. | |
85 | */ | |
8efc0c15 | 86 | extern char *host; |
87 | ||
aa3378df | 88 | /* |
89 | * Flag to indicate that we have received a window change signal which has | |
90 | * not yet been processed. This will cause a message indicating the new | |
91 | * window size to be sent to the server a little later. This is volatile | |
92 | * because this is updated in a signal handler. | |
93 | */ | |
8efc0c15 | 94 | static volatile int received_window_change_signal = 0; |
95 | ||
96 | /* Terminal modes, as saved by enter_raw_mode. */ | |
97 | static struct termios saved_tio; | |
98 | ||
aa3378df | 99 | /* |
100 | * Flag indicating whether we are in raw mode. This is used by | |
101 | * enter_raw_mode and leave_raw_mode. | |
102 | */ | |
8efc0c15 | 103 | static int in_raw_mode = 0; |
104 | ||
105 | /* Flag indicating whether the user\'s terminal is in non-blocking mode. */ | |
106 | static int in_non_blocking_mode = 0; | |
107 | ||
108 | /* Common data for the client loop code. */ | |
2e73a022 | 109 | static int quit_pending; /* Set to non-zero to quit the client loop. */ |
110 | static int escape_char; /* Escape character. */ | |
5260325f | 111 | static int escape_pending; /* Last character was the escape character */ |
112 | static int last_was_cr; /* Last character was a newline. */ | |
113 | static int exit_status; /* Used to store the exit status of the command. */ | |
114 | static int stdin_eof; /* EOF has been encountered on standard error. */ | |
115 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
116 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
117 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
2e73a022 | 118 | static unsigned long stdin_bytes, stdout_bytes, stderr_bytes; |
5260325f | 119 | static unsigned int buffer_high;/* Soft max buffer size. */ |
120 | static int max_fd; /* Maximum file descriptor number in select(). */ | |
121 | static int connection_in; /* Connection to server (input). */ | |
122 | static int connection_out; /* Connection to server (output). */ | |
8efc0c15 | 123 | |
8ce64345 | 124 | |
125 | void client_init_dispatch(void); | |
126 | int session_ident = -1; | |
127 | ||
aa3378df | 128 | /* Returns the user\'s terminal to normal mode if it had been put in raw mode. */ |
8efc0c15 | 129 | |
6ae2364d | 130 | void |
5260325f | 131 | leave_raw_mode() |
8efc0c15 | 132 | { |
5260325f | 133 | if (!in_raw_mode) |
134 | return; | |
135 | in_raw_mode = 0; | |
136 | if (tcsetattr(fileno(stdin), TCSADRAIN, &saved_tio) < 0) | |
137 | perror("tcsetattr"); | |
8efc0c15 | 138 | |
5260325f | 139 | fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL); |
8efc0c15 | 140 | } |
141 | ||
142 | /* Puts the user\'s terminal in raw mode. */ | |
143 | ||
6ae2364d | 144 | void |
5260325f | 145 | enter_raw_mode() |
8efc0c15 | 146 | { |
5260325f | 147 | struct termios tio; |
148 | ||
149 | if (tcgetattr(fileno(stdin), &tio) < 0) | |
150 | perror("tcgetattr"); | |
151 | saved_tio = tio; | |
152 | tio.c_iflag |= IGNPAR; | |
153 | tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF); | |
154 | tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL); | |
8efc0c15 | 155 | #ifdef IEXTEN |
5260325f | 156 | tio.c_lflag &= ~IEXTEN; |
157 | #endif /* IEXTEN */ | |
158 | tio.c_oflag &= ~OPOST; | |
159 | tio.c_cc[VMIN] = 1; | |
160 | tio.c_cc[VTIME] = 0; | |
161 | if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) < 0) | |
162 | perror("tcsetattr"); | |
163 | in_raw_mode = 1; | |
164 | ||
165 | fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL); | |
166 | } | |
8efc0c15 | 167 | |
168 | /* Restores stdin to blocking mode. */ | |
169 | ||
6ae2364d | 170 | void |
5260325f | 171 | leave_non_blocking() |
8efc0c15 | 172 | { |
5260325f | 173 | if (in_non_blocking_mode) { |
174 | (void) fcntl(fileno(stdin), F_SETFL, 0); | |
175 | in_non_blocking_mode = 0; | |
176 | fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL); | |
177 | } | |
8efc0c15 | 178 | } |
179 | ||
5260325f | 180 | /* Puts stdin terminal in non-blocking mode. */ |
181 | ||
6ae2364d | 182 | void |
5260325f | 183 | enter_non_blocking() |
8efc0c15 | 184 | { |
5260325f | 185 | in_non_blocking_mode = 1; |
186 | (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK); | |
187 | fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL); | |
8efc0c15 | 188 | } |
189 | ||
aa3378df | 190 | /* |
191 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
192 | * flag indicating that the window has changed. | |
193 | */ | |
8efc0c15 | 194 | |
6ae2364d | 195 | void |
5260325f | 196 | window_change_handler(int sig) |
8efc0c15 | 197 | { |
5260325f | 198 | received_window_change_signal = 1; |
199 | signal(SIGWINCH, window_change_handler); | |
8efc0c15 | 200 | } |
201 | ||
aa3378df | 202 | /* |
203 | * Signal handler for signals that cause the program to terminate. These | |
204 | * signals must be trapped to restore terminal modes. | |
205 | */ | |
8efc0c15 | 206 | |
6ae2364d | 207 | void |
5260325f | 208 | signal_handler(int sig) |
8efc0c15 | 209 | { |
5260325f | 210 | if (in_raw_mode) |
211 | leave_raw_mode(); | |
212 | if (in_non_blocking_mode) | |
213 | leave_non_blocking(); | |
214 | channel_stop_listening(); | |
215 | packet_close(); | |
216 | fatal("Killed by signal %d.", sig); | |
8efc0c15 | 217 | } |
218 | ||
aa3378df | 219 | /* |
220 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
221 | * available resolution. | |
222 | */ | |
8efc0c15 | 223 | |
6ae2364d | 224 | double |
5260325f | 225 | get_current_time() |
8efc0c15 | 226 | { |
5260325f | 227 | struct timeval tv; |
228 | gettimeofday(&tv, NULL); | |
229 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
8efc0c15 | 230 | } |
231 | ||
aa3378df | 232 | /* |
233 | * This is called when the interactive is entered. This checks if there is | |
234 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
235 | * not appear to wake up when redirecting from /dev/null. | |
236 | */ | |
8efc0c15 | 237 | |
6ae2364d | 238 | void |
5260325f | 239 | client_check_initial_eof_on_stdin() |
8efc0c15 | 240 | { |
5260325f | 241 | int len; |
242 | char buf[1]; | |
243 | ||
aa3378df | 244 | /* |
245 | * If standard input is to be "redirected from /dev/null", we simply | |
246 | * mark that we have seen an EOF and send an EOF message to the | |
247 | * server. Otherwise, we try to read a single character; it appears | |
248 | * that for some files, such /dev/null, select() never wakes up for | |
249 | * read for this descriptor, which means that we never get EOF. This | |
250 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
251 | */ | |
5260325f | 252 | if (stdin_null_flag) { |
253 | /* Fake EOF on stdin. */ | |
254 | debug("Sending eof."); | |
255 | stdin_eof = 1; | |
256 | packet_start(SSH_CMSG_EOF); | |
257 | packet_send(); | |
258 | } else { | |
5260325f | 259 | enter_non_blocking(); |
260 | ||
261 | /* Check for immediate EOF on stdin. */ | |
262 | len = read(fileno(stdin), buf, 1); | |
263 | if (len == 0) { | |
aa3378df | 264 | /* EOF. Record that we have seen it and send EOF to server. */ |
5260325f | 265 | debug("Sending eof."); |
266 | stdin_eof = 1; | |
267 | packet_start(SSH_CMSG_EOF); | |
268 | packet_send(); | |
269 | } else if (len > 0) { | |
aa3378df | 270 | /* |
271 | * Got data. We must store the data in the buffer, | |
272 | * and also process it as an escape character if | |
273 | * appropriate. | |
274 | */ | |
5260325f | 275 | if ((unsigned char) buf[0] == escape_char) |
276 | escape_pending = 1; | |
277 | else { | |
278 | buffer_append(&stdin_buffer, buf, 1); | |
279 | stdin_bytes += 1; | |
280 | } | |
281 | } | |
5260325f | 282 | leave_non_blocking(); |
8efc0c15 | 283 | } |
8efc0c15 | 284 | } |
285 | ||
8efc0c15 | 286 | |
aa3378df | 287 | /* |
288 | * Make packets from buffered stdin data, and buffer them for sending to the | |
289 | * connection. | |
290 | */ | |
8efc0c15 | 291 | |
6ae2364d | 292 | void |
5260325f | 293 | client_make_packets_from_stdin_data() |
8efc0c15 | 294 | { |
5260325f | 295 | unsigned int len; |
296 | ||
297 | /* Send buffered stdin data to the server. */ | |
298 | while (buffer_len(&stdin_buffer) > 0 && | |
299 | packet_not_very_much_data_to_write()) { | |
300 | len = buffer_len(&stdin_buffer); | |
301 | /* Keep the packets at reasonable size. */ | |
302 | if (len > packet_get_maxsize()) | |
303 | len = packet_get_maxsize(); | |
304 | packet_start(SSH_CMSG_STDIN_DATA); | |
305 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
306 | packet_send(); | |
307 | buffer_consume(&stdin_buffer, len); | |
308 | /* If we have a pending EOF, send it now. */ | |
309 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
310 | packet_start(SSH_CMSG_EOF); | |
311 | packet_send(); | |
312 | } | |
8efc0c15 | 313 | } |
8efc0c15 | 314 | } |
315 | ||
aa3378df | 316 | /* |
317 | * Checks if the client window has changed, and sends a packet about it to | |
318 | * the server if so. The actual change is detected elsewhere (by a software | |
319 | * interrupt on Unix); this just checks the flag and sends a message if | |
320 | * appropriate. | |
321 | */ | |
8efc0c15 | 322 | |
6ae2364d | 323 | void |
5260325f | 324 | client_check_window_change() |
8efc0c15 | 325 | { |
8ce64345 | 326 | struct winsize ws; |
327 | ||
328 | if (! received_window_change_signal) | |
329 | return; | |
330 | /** XXX race */ | |
331 | received_window_change_signal = 0; | |
332 | ||
333 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
334 | return; | |
335 | ||
336 | debug("client_check_window_change: changed"); | |
337 | ||
338 | if (compat20) { | |
339 | channel_request_start(session_ident, "window-change", 0); | |
340 | packet_put_int(ws.ws_col); | |
341 | packet_put_int(ws.ws_row); | |
342 | packet_put_int(ws.ws_xpixel); | |
343 | packet_put_int(ws.ws_ypixel); | |
344 | packet_send(); | |
345 | } else { | |
346 | packet_start(SSH_CMSG_WINDOW_SIZE); | |
347 | packet_put_int(ws.ws_row); | |
348 | packet_put_int(ws.ws_col); | |
349 | packet_put_int(ws.ws_xpixel); | |
350 | packet_put_int(ws.ws_ypixel); | |
351 | packet_send(); | |
8efc0c15 | 352 | } |
8efc0c15 | 353 | } |
354 | ||
aa3378df | 355 | /* |
356 | * Waits until the client can do something (some data becomes available on | |
357 | * one of the file descriptors). | |
358 | */ | |
8efc0c15 | 359 | |
6ae2364d | 360 | void |
5260325f | 361 | client_wait_until_can_do_something(fd_set * readset, fd_set * writeset) |
8efc0c15 | 362 | { |
8ce64345 | 363 | /*debug("client_wait_until_can_do_something"); */ |
364 | ||
5260325f | 365 | /* Initialize select masks. */ |
366 | FD_ZERO(readset); | |
8ce64345 | 367 | FD_ZERO(writeset); |
5260325f | 368 | |
8ce64345 | 369 | if (!compat20) { |
370 | /* Read from the connection, unless our buffers are full. */ | |
371 | if (buffer_len(&stdout_buffer) < buffer_high && | |
372 | buffer_len(&stderr_buffer) < buffer_high && | |
373 | channel_not_very_much_buffered_data()) | |
374 | FD_SET(connection_in, readset); | |
375 | /* | |
376 | * Read from stdin, unless we have seen EOF or have very much | |
377 | * buffered data to send to the server. | |
378 | */ | |
379 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
380 | FD_SET(fileno(stdin), readset); | |
381 | ||
382 | /* Select stdout/stderr if have data in buffer. */ | |
383 | if (buffer_len(&stdout_buffer) > 0) | |
384 | FD_SET(fileno(stdout), writeset); | |
385 | if (buffer_len(&stderr_buffer) > 0) | |
386 | FD_SET(fileno(stderr), writeset); | |
387 | } else { | |
5260325f | 388 | FD_SET(connection_in, readset); |
8ce64345 | 389 | } |
5260325f | 390 | |
391 | /* Add any selections by the channel mechanism. */ | |
392 | channel_prepare_select(readset, writeset); | |
393 | ||
394 | /* Select server connection if have data to write to the server. */ | |
395 | if (packet_have_data_to_write()) | |
396 | FD_SET(connection_out, writeset); | |
397 | ||
8ce64345 | 398 | /* move UP XXX */ |
5260325f | 399 | /* Update maximum file descriptor number, if appropriate. */ |
400 | if (channel_max_fd() > max_fd) | |
401 | max_fd = channel_max_fd(); | |
402 | ||
aa3378df | 403 | /* |
404 | * Wait for something to happen. This will suspend the process until | |
405 | * some selected descriptor can be read, written, or has some other | |
406 | * event pending. Note: if you want to implement SSH_MSG_IGNORE | |
407 | * messages to fool traffic analysis, this might be the place to do | |
408 | * it: just have a random timeout for the select, and send a random | |
409 | * SSH_MSG_IGNORE packet when the timeout expires. | |
410 | */ | |
5260325f | 411 | |
412 | if (select(max_fd + 1, readset, writeset, NULL, NULL) < 0) { | |
413 | char buf[100]; | |
414 | /* Some systems fail to clear these automatically. */ | |
415 | FD_ZERO(readset); | |
416 | FD_ZERO(writeset); | |
417 | if (errno == EINTR) | |
418 | return; | |
419 | /* Note: we might still have data in the buffers. */ | |
420 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
421 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
422 | stderr_bytes += strlen(buf); | |
423 | quit_pending = 1; | |
424 | } | |
8efc0c15 | 425 | } |
426 | ||
6ae2364d | 427 | void |
2e73a022 | 428 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
8efc0c15 | 429 | { |
5260325f | 430 | struct winsize oldws, newws; |
431 | ||
432 | /* Flush stdout and stderr buffers. */ | |
2e73a022 | 433 | if (buffer_len(bout) > 0) |
434 | atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); | |
435 | if (buffer_len(berr) > 0) | |
436 | atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); | |
5260325f | 437 | |
5260325f | 438 | leave_raw_mode(); |
439 | ||
aa3378df | 440 | /* |
441 | * Free (and clear) the buffer to reduce the amount of data that gets | |
442 | * written to swap. | |
443 | */ | |
2e73a022 | 444 | buffer_free(bin); |
445 | buffer_free(bout); | |
446 | buffer_free(berr); | |
5260325f | 447 | |
448 | /* Save old window size. */ | |
449 | ioctl(fileno(stdin), TIOCGWINSZ, &oldws); | |
450 | ||
451 | /* Send the suspend signal to the program itself. */ | |
452 | kill(getpid(), SIGTSTP); | |
453 | ||
454 | /* Check if the window size has changed. */ | |
455 | if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 && | |
456 | (oldws.ws_row != newws.ws_row || | |
457 | oldws.ws_col != newws.ws_col || | |
458 | oldws.ws_xpixel != newws.ws_xpixel || | |
459 | oldws.ws_ypixel != newws.ws_ypixel)) | |
460 | received_window_change_signal = 1; | |
461 | ||
462 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
2e73a022 | 463 | buffer_init(bin); |
464 | buffer_init(bout); | |
465 | buffer_init(berr); | |
5260325f | 466 | |
5260325f | 467 | enter_raw_mode(); |
8efc0c15 | 468 | } |
469 | ||
6ae2364d | 470 | void |
8ce64345 | 471 | client_process_net_input(fd_set * readset) |
8efc0c15 | 472 | { |
8ce64345 | 473 | int len; |
474 | char buf[8192]; | |
5260325f | 475 | |
aa3378df | 476 | /* |
477 | * Read input from the server, and add any such data to the buffer of | |
478 | * the packet subsystem. | |
479 | */ | |
5260325f | 480 | if (FD_ISSET(connection_in, readset)) { |
481 | /* Read as much as possible. */ | |
482 | len = read(connection_in, buf, sizeof(buf)); | |
8ce64345 | 483 | /*debug("read connection_in len %d", len); XXX */ |
5260325f | 484 | if (len == 0) { |
485 | /* Received EOF. The remote host has closed the connection. */ | |
486 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
487 | host); | |
8efc0c15 | 488 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
489 | stderr_bytes += strlen(buf); | |
490 | quit_pending = 1; | |
491 | return; | |
5260325f | 492 | } |
aa3378df | 493 | /* |
494 | * There is a kernel bug on Solaris that causes select to | |
495 | * sometimes wake up even though there is no data available. | |
496 | */ | |
5260325f | 497 | if (len < 0 && errno == EAGAIN) |
498 | len = 0; | |
499 | ||
500 | if (len < 0) { | |
501 | /* An error has encountered. Perhaps there is a network problem. */ | |
502 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
503 | host, strerror(errno)); | |
504 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
505 | stderr_bytes += strlen(buf); | |
506 | quit_pending = 1; | |
507 | return; | |
508 | } | |
509 | packet_process_incoming(buf, len); | |
510 | } | |
8ce64345 | 511 | } |
512 | ||
2e73a022 | 513 | /* process the characters one by one */ |
514 | int | |
515 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) | |
516 | { | |
517 | char string[1024]; | |
518 | pid_t pid; | |
519 | int bytes = 0; | |
520 | unsigned int i; | |
521 | unsigned char ch; | |
522 | char *s; | |
523 | ||
524 | for (i = 0; i < len; i++) { | |
525 | /* Get one character at a time. */ | |
526 | ch = buf[i]; | |
527 | ||
528 | if (escape_pending) { | |
529 | /* We have previously seen an escape character. */ | |
530 | /* Clear the flag now. */ | |
531 | escape_pending = 0; | |
532 | ||
533 | /* Process the escaped character. */ | |
534 | switch (ch) { | |
535 | case '.': | |
536 | /* Terminate the connection. */ | |
537 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
538 | buffer_append(berr, string, strlen(string)); | |
539 | /*stderr_bytes += strlen(string); XXX*/ | |
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)); | |
549 | /*stderr_bytes += strlen(string); XXX*/ | |
550 | ||
551 | /* Restore terminal modes and suspend. */ | |
552 | client_suspend_self(bin, bout, berr); | |
553 | ||
554 | /* We have been continued. */ | |
555 | continue; | |
556 | ||
557 | case '&': | |
558 | /* XXX does not work yet with proto 2 */ | |
559 | if (compat20) | |
560 | continue; | |
561 | /* | |
562 | * Detach the program (continue to serve connections, | |
563 | * but put in background and no more new connections). | |
564 | */ | |
565 | if (!stdin_eof) { | |
566 | /* | |
567 | * Sending SSH_CMSG_EOF alone does not always appear | |
568 | * to be enough. So we try to send an EOF character | |
569 | * first. | |
570 | */ | |
571 | packet_start(SSH_CMSG_STDIN_DATA); | |
572 | packet_put_string("\004", 1); | |
573 | packet_send(); | |
574 | /* Close stdin. */ | |
575 | stdin_eof = 1; | |
576 | if (buffer_len(bin) == 0) { | |
577 | packet_start(SSH_CMSG_EOF); | |
578 | packet_send(); | |
579 | } | |
580 | } | |
581 | /* Restore tty modes. */ | |
582 | leave_raw_mode(); | |
583 | ||
584 | /* Stop listening for new connections. */ | |
585 | channel_stop_listening(); | |
586 | ||
587 | printf("%c& [backgrounded]\n", escape_char); | |
588 | ||
589 | /* Fork into background. */ | |
590 | pid = fork(); | |
591 | if (pid < 0) { | |
592 | error("fork: %.100s", strerror(errno)); | |
593 | continue; | |
594 | } | |
595 | if (pid != 0) { /* This is the parent. */ | |
596 | /* The parent just exits. */ | |
597 | exit(0); | |
598 | } | |
599 | /* The child continues serving connections. */ | |
600 | continue; /*XXX ? */ | |
601 | ||
602 | case '?': | |
603 | snprintf(string, sizeof string, | |
604 | "%c?\r\n\ | |
605 | Supported escape sequences:\r\n\ | |
606 | ~. - terminate connection\r\n\ | |
607 | ~^Z - suspend ssh\r\n\ | |
608 | ~# - list forwarded connections\r\n\ | |
609 | ~& - background ssh (when waiting for connections to terminate)\r\n\ | |
610 | ~? - this message\r\n\ | |
611 | ~~ - send the escape character by typing it twice\r\n\ | |
612 | (Note that escapes are only recognized immediately after newline.)\r\n", | |
613 | escape_char); | |
614 | buffer_append(berr, string, strlen(string)); | |
615 | continue; | |
616 | ||
617 | case '#': | |
618 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
619 | buffer_append(berr, string, strlen(string)); | |
620 | s = channel_open_message(); | |
621 | buffer_append(berr, s, strlen(s)); | |
622 | xfree(s); | |
623 | continue; | |
624 | ||
625 | default: | |
626 | if (ch != escape_char) { | |
627 | buffer_put_char(bin, escape_char); | |
628 | bytes++; | |
629 | } | |
630 | /* Escaped characters fall through here */ | |
631 | break; | |
632 | } | |
633 | } else { | |
634 | /* | |
635 | * The previous character was not an escape char. Check if this | |
636 | * is an escape. | |
637 | */ | |
638 | if (last_was_cr && ch == escape_char) { | |
639 | /* It is. Set the flag and continue to next character. */ | |
640 | escape_pending = 1; | |
641 | continue; | |
642 | } | |
643 | } | |
644 | ||
645 | /* | |
646 | * Normal character. Record whether it was a newline, | |
647 | * and append it to the buffer. | |
648 | */ | |
649 | last_was_cr = (ch == '\r' || ch == '\n'); | |
650 | buffer_put_char(bin, ch); | |
651 | bytes++; | |
652 | } | |
653 | return bytes; | |
654 | } | |
655 | ||
6ae2364d | 656 | void |
8ce64345 | 657 | client_process_input(fd_set * readset) |
658 | { | |
2e73a022 | 659 | int ret; |
9da5c3c9 | 660 | int len; |
2e73a022 | 661 | char buf[8192]; |
8ce64345 | 662 | |
5260325f | 663 | /* Read input from stdin. */ |
664 | if (FD_ISSET(fileno(stdin), readset)) { | |
665 | /* Read as much as possible. */ | |
666 | len = read(fileno(stdin), buf, sizeof(buf)); | |
667 | if (len <= 0) { | |
aa3378df | 668 | /* |
669 | * Received EOF or error. They are treated | |
670 | * similarly, except that an error message is printed | |
671 | * if it was an error condition. | |
672 | */ | |
5260325f | 673 | if (len < 0) { |
674 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
675 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
676 | stderr_bytes += strlen(buf); | |
677 | } | |
678 | /* Mark that we have seen EOF. */ | |
679 | stdin_eof = 1; | |
aa3378df | 680 | /* |
681 | * Send an EOF message to the server unless there is | |
682 | * data in the buffer. If there is data in the | |
683 | * buffer, no message will be sent now. Code | |
684 | * elsewhere will send the EOF when the buffer | |
685 | * becomes empty if stdin_eof is set. | |
686 | */ | |
5260325f | 687 | if (buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 688 | packet_start(SSH_CMSG_EOF); |
689 | packet_send(); | |
5260325f | 690 | } |
691 | } else if (escape_char == -1) { | |
aa3378df | 692 | /* |
693 | * Normal successful read, and no escape character. | |
694 | * Just append the data to buffer. | |
695 | */ | |
5260325f | 696 | buffer_append(&stdin_buffer, buf, len); |
697 | stdin_bytes += len; | |
698 | } else { | |
aa3378df | 699 | /* |
700 | * Normal, successful read. But we have an escape character | |
701 | * and have to process the characters one by one. | |
702 | */ | |
2e73a022 | 703 | ret = process_escapes(&stdin_buffer, &stdout_buffer, &stderr_buffer, buf, len); |
704 | if (ret == -1) | |
705 | return; | |
706 | stdout_bytes += ret; | |
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)); | |
732 | stderr_bytes += strlen(buf); | |
733 | quit_pending = 1; | |
734 | return; | |
735 | } | |
736 | } | |
737 | /* Consume printed data from the buffer. */ | |
738 | buffer_consume(&stdout_buffer, len); | |
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); | |
8efc0c15 | 756 | } |
8efc0c15 | 757 | } |
758 | ||
7368a6c8 | 759 | /* |
760 | * Get packets from the connection input buffer, and process them as long as | |
761 | * there are packets available. | |
762 | * | |
763 | * Any unknown packets received during the actual | |
764 | * session cause the session to terminate. This is | |
765 | * intended to make debugging easier since no | |
766 | * confirmations are sent. Any compatible protocol | |
767 | * extensions must be negotiated during the | |
768 | * preparatory phase. | |
769 | */ | |
770 | ||
6ae2364d | 771 | void |
7368a6c8 | 772 | client_process_buffered_input_packets() |
773 | { | |
188adeb2 | 774 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, NULL); |
7368a6c8 | 775 | } |
776 | ||
2e73a022 | 777 | /* scan buf[] for '~' before sending data to the peer */ |
778 | ||
779 | int | |
780 | simple_escape_filter(Channel *c, char *buf, int len) | |
781 | { | |
782 | /* XXX we assume c->extended is writeable */ | |
783 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
784 | } | |
785 | ||
aa3378df | 786 | /* |
787 | * Implements the interactive session with the server. This is called after | |
788 | * the user has been authenticated, and a command has been started on the | |
789 | * remote host. If escape_char != -1, it is the character used as an escape | |
790 | * character for terminating or suspending the session. | |
791 | */ | |
8efc0c15 | 792 | |
6ae2364d | 793 | int |
2e73a022 | 794 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
8efc0c15 | 795 | { |
5260325f | 796 | extern Options options; |
797 | double start_time, total_time; | |
798 | int len; | |
799 | char buf[100]; | |
800 | ||
801 | debug("Entering interactive session."); | |
802 | ||
803 | start_time = get_current_time(); | |
804 | ||
805 | /* Initialize variables. */ | |
806 | escape_pending = 0; | |
807 | last_was_cr = 1; | |
808 | exit_status = -1; | |
809 | stdin_eof = 0; | |
810 | buffer_high = 64 * 1024; | |
811 | connection_in = packet_get_connection_in(); | |
812 | connection_out = packet_get_connection_out(); | |
813 | max_fd = connection_in; | |
814 | if (connection_out > max_fd) | |
815 | max_fd = connection_out; | |
816 | stdin_bytes = 0; | |
817 | stdout_bytes = 0; | |
818 | stderr_bytes = 0; | |
819 | quit_pending = 0; | |
820 | escape_char = escape_char_arg; | |
821 | ||
822 | /* Initialize buffers. */ | |
823 | buffer_init(&stdin_buffer); | |
824 | buffer_init(&stdout_buffer); | |
825 | buffer_init(&stderr_buffer); | |
826 | ||
7368a6c8 | 827 | client_init_dispatch(); |
828 | ||
5260325f | 829 | /* Set signal handlers to restore non-blocking mode. */ |
830 | signal(SIGINT, signal_handler); | |
831 | signal(SIGQUIT, signal_handler); | |
832 | signal(SIGTERM, signal_handler); | |
833 | signal(SIGPIPE, SIG_IGN); | |
834 | if (have_pty) | |
835 | signal(SIGWINCH, window_change_handler); | |
836 | ||
5260325f | 837 | if (have_pty) |
838 | enter_raw_mode(); | |
839 | ||
704b1659 | 840 | /* Check if we should immediately send eof on stdin. */ |
8ce64345 | 841 | if (!compat20) |
842 | client_check_initial_eof_on_stdin(); | |
5260325f | 843 | |
2e73a022 | 844 | if (compat20 && escape_char != -1) |
845 | channel_register_filter(ssh2_chan_id, simple_escape_filter); | |
846 | ||
5260325f | 847 | /* Main loop of the client for the interactive session mode. */ |
848 | while (!quit_pending) { | |
849 | fd_set readset, writeset; | |
850 | ||
aa3378df | 851 | /* Process buffered packets sent by the server. */ |
5260325f | 852 | client_process_buffered_input_packets(); |
853 | ||
8ce64345 | 854 | if (compat20 && !channel_still_open()) { |
855 | debug("!channel_still_open."); | |
856 | break; | |
857 | } | |
858 | ||
aa3378df | 859 | /* |
860 | * Make packets of buffered stdin data, and buffer them for | |
861 | * sending to the server. | |
862 | */ | |
8ce64345 | 863 | if (!compat20) |
864 | client_make_packets_from_stdin_data(); | |
5260325f | 865 | |
aa3378df | 866 | /* |
867 | * Make packets from buffered channel data, and buffer them | |
868 | * for sending to the server. | |
869 | */ | |
5260325f | 870 | if (packet_not_very_much_data_to_write()) |
871 | channel_output_poll(); | |
872 | ||
aa3378df | 873 | /* |
874 | * Check if the window size has changed, and buffer a message | |
875 | * about it to the server if so. | |
876 | */ | |
5260325f | 877 | client_check_window_change(); |
878 | ||
879 | if (quit_pending) | |
880 | break; | |
881 | ||
aa3378df | 882 | /* |
883 | * Wait until we have something to do (something becomes | |
884 | * available on one of the descriptors). | |
885 | */ | |
5260325f | 886 | client_wait_until_can_do_something(&readset, &writeset); |
887 | ||
888 | if (quit_pending) | |
889 | break; | |
890 | ||
891 | /* Do channel operations. */ | |
892 | channel_after_select(&readset, &writeset); | |
893 | ||
8ce64345 | 894 | /* Buffer input from the connection. */ |
895 | client_process_net_input(&readset); | |
5260325f | 896 | |
8ce64345 | 897 | if (quit_pending) |
898 | break; | |
899 | ||
900 | if (!compat20) { | |
901 | /* Buffer data from stdin */ | |
902 | client_process_input(&readset); | |
903 | /* | |
904 | * Process output to stdout and stderr. Output to | |
905 | * the connection is processed elsewhere (above). | |
906 | */ | |
907 | client_process_output(&writeset); | |
908 | } | |
5260325f | 909 | |
aa3378df | 910 | /* Send as much buffered packet data as possible to the sender. */ |
5260325f | 911 | if (FD_ISSET(connection_out, &writeset)) |
912 | packet_write_poll(); | |
913 | } | |
914 | ||
915 | /* Terminate the session. */ | |
916 | ||
917 | /* Stop watching for window change. */ | |
918 | if (have_pty) | |
919 | signal(SIGWINCH, SIG_DFL); | |
920 | ||
921 | /* Stop listening for connections. */ | |
922 | channel_stop_listening(); | |
923 | ||
aa3378df | 924 | /* |
925 | * In interactive mode (with pseudo tty) display a message indicating | |
926 | * that the connection has been closed. | |
927 | */ | |
5260325f | 928 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { |
929 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
930 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
931 | stderr_bytes += strlen(buf); | |
8efc0c15 | 932 | } |
5260325f | 933 | /* Output any buffered data for stdout. */ |
934 | while (buffer_len(&stdout_buffer) > 0) { | |
935 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 936 | buffer_len(&stdout_buffer)); |
5260325f | 937 | if (len <= 0) { |
938 | error("Write failed flushing stdout buffer."); | |
939 | break; | |
940 | } | |
941 | buffer_consume(&stdout_buffer, len); | |
8efc0c15 | 942 | } |
5260325f | 943 | |
944 | /* Output any buffered data for stderr. */ | |
945 | while (buffer_len(&stderr_buffer) > 0) { | |
946 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 947 | buffer_len(&stderr_buffer)); |
5260325f | 948 | if (len <= 0) { |
949 | error("Write failed flushing stderr buffer."); | |
950 | break; | |
951 | } | |
952 | buffer_consume(&stderr_buffer, len); | |
953 | } | |
954 | ||
5260325f | 955 | if (have_pty) |
956 | leave_raw_mode(); | |
957 | ||
958 | /* Clear and free any buffers. */ | |
959 | memset(buf, 0, sizeof(buf)); | |
960 | buffer_free(&stdin_buffer); | |
961 | buffer_free(&stdout_buffer); | |
962 | buffer_free(&stderr_buffer); | |
963 | ||
964 | /* Report bytes transferred, and transfer rates. */ | |
965 | total_time = get_current_time() - start_time; | |
966 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
967 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); | |
968 | if (total_time > 0) | |
969 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
970 | stdin_bytes / total_time, stdout_bytes / total_time, | |
971 | stderr_bytes / total_time); | |
972 | ||
973 | /* Return the exit status of the program. */ | |
974 | debug("Exit status %d", exit_status); | |
975 | return exit_status; | |
8efc0c15 | 976 | } |
7368a6c8 | 977 | |
978 | /*********/ | |
979 | ||
980 | void | |
188adeb2 | 981 | client_input_stdout_data(int type, int plen, void *ctxt) |
7368a6c8 | 982 | { |
983 | unsigned int data_len; | |
984 | char *data = packet_get_string(&data_len); | |
985 | packet_integrity_check(plen, 4 + data_len, type); | |
986 | buffer_append(&stdout_buffer, data, data_len); | |
987 | stdout_bytes += data_len; | |
988 | memset(data, 0, data_len); | |
989 | xfree(data); | |
990 | } | |
991 | void | |
188adeb2 | 992 | client_input_stderr_data(int type, int plen, void *ctxt) |
7368a6c8 | 993 | { |
994 | unsigned int data_len; | |
995 | char *data = packet_get_string(&data_len); | |
996 | packet_integrity_check(plen, 4 + data_len, type); | |
997 | buffer_append(&stderr_buffer, data, data_len); | |
998 | stdout_bytes += data_len; | |
999 | memset(data, 0, data_len); | |
1000 | xfree(data); | |
1001 | } | |
1002 | void | |
188adeb2 | 1003 | client_input_exit_status(int type, int plen, void *ctxt) |
7368a6c8 | 1004 | { |
1005 | packet_integrity_check(plen, 4, type); | |
1006 | exit_status = packet_get_int(); | |
1007 | /* Acknowledge the exit. */ | |
1008 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1009 | packet_send(); | |
1010 | /* | |
1011 | * Must wait for packet to be sent since we are | |
1012 | * exiting the loop. | |
1013 | */ | |
1014 | packet_write_wait(); | |
1015 | /* Flag that we want to exit. */ | |
1016 | quit_pending = 1; | |
1017 | } | |
1018 | ||
0b242b12 | 1019 | /* XXXX move to generic input handler */ |
1020 | void | |
188adeb2 | 1021 | client_input_channel_open(int type, int plen, void *ctxt) |
0b242b12 | 1022 | { |
1023 | Channel *c = NULL; | |
1024 | char *ctype; | |
1025 | int id; | |
1026 | unsigned int len; | |
1027 | int rchan; | |
1028 | int rmaxpack; | |
1029 | int rwindow; | |
1030 | ||
1031 | ctype = packet_get_string(&len); | |
1032 | rchan = packet_get_int(); | |
1033 | rwindow = packet_get_int(); | |
1034 | rmaxpack = packet_get_int(); | |
1035 | ||
1d1ffb87 | 1036 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
0b242b12 | 1037 | ctype, rchan, rwindow, rmaxpack); |
1038 | ||
1039 | if (strcmp(ctype, "x11") == 0) { | |
1040 | int sock; | |
1041 | char *originator; | |
1042 | int originator_port; | |
1043 | originator = packet_get_string(NULL); | |
d0c832f3 | 1044 | if (datafellows & SSH_BUG_X11FWD) { |
f6cde515 | 1045 | debug("buggy server: x11 request w/o originator_port"); |
1046 | originator_port = 0; | |
d0c832f3 | 1047 | } else { |
1048 | originator_port = packet_get_int(); | |
f6cde515 | 1049 | } |
0b242b12 | 1050 | packet_done(); |
1051 | /* XXX check permission */ | |
1052 | xfree(originator); | |
1053 | /* XXX move to channels.c */ | |
1054 | sock = x11_connect_display(); | |
1055 | if (sock >= 0) { | |
1056 | id = channel_new("x11", SSH_CHANNEL_X11_OPEN, | |
bcbf86ec | 1057 | sock, sock, -1, CHAN_X11_WINDOW_DEFAULT, |
1058 | CHAN_X11_PACKET_DEFAULT, 0, xstrdup("x11")); | |
0b242b12 | 1059 | c = channel_lookup(id); |
1060 | } | |
1061 | } | |
1062 | /* XXX duplicate : */ | |
1063 | if (c != NULL) { | |
1064 | debug("confirm %s", ctype); | |
1065 | c->remote_id = rchan; | |
1066 | c->remote_window = rwindow; | |
1067 | c->remote_maxpacket = rmaxpack; | |
1068 | ||
1069 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1070 | packet_put_int(c->remote_id); | |
1071 | packet_put_int(c->self); | |
1072 | packet_put_int(c->local_window); | |
1073 | packet_put_int(c->local_maxpacket); | |
1074 | packet_send(); | |
1075 | } else { | |
1076 | debug("failure %s", ctype); | |
1077 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1078 | packet_put_int(rchan); | |
1079 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
1080 | packet_put_cstring("bla bla"); | |
1081 | packet_put_cstring(""); | |
1082 | packet_send(); | |
1083 | } | |
1084 | xfree(ctype); | |
1085 | } | |
1086 | ||
6ae2364d | 1087 | void |
8ce64345 | 1088 | client_init_dispatch_20() |
1089 | { | |
1090 | dispatch_init(&dispatch_protocol_error); | |
1091 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); | |
1092 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1093 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1094 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
0b242b12 | 1095 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
8ce64345 | 1096 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1097 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1098 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request); | |
1099 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); | |
1100 | } | |
6ae2364d | 1101 | void |
7368a6c8 | 1102 | client_init_dispatch_13() |
1103 | { | |
1104 | dispatch_init(NULL); | |
1105 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1106 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1107 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
7368a6c8 | 1108 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1109 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1110 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
1111 | dispatch_set(SSH_SMSG_AGENT_OPEN, &auth_input_open_request); | |
1112 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); | |
1113 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1114 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
1115 | dispatch_set(SSH_SMSG_X11_OPEN, &x11_input_open); | |
1116 | } | |
6ae2364d | 1117 | void |
7368a6c8 | 1118 | client_init_dispatch_15() |
1119 | { | |
1120 | client_init_dispatch_13(); | |
1121 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1122 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1123 | } | |
6ae2364d | 1124 | void |
7368a6c8 | 1125 | client_init_dispatch() |
1126 | { | |
8ce64345 | 1127 | if (compat20) |
1128 | client_init_dispatch_20(); | |
1129 | else if (compat13) | |
7368a6c8 | 1130 | client_init_dispatch_13(); |
1131 | else | |
1132 | client_init_dispatch_15(); | |
1133 | } | |
8ce64345 | 1134 | |
1135 | void | |
1136 | client_input_channel_req(int id, void *arg) | |
1137 | { | |
1138 | Channel *c = NULL; | |
1139 | unsigned int len; | |
1140 | int success = 0; | |
1141 | int reply; | |
1142 | char *rtype; | |
1143 | ||
1144 | rtype = packet_get_string(&len); | |
1145 | reply = packet_get_char(); | |
1146 | ||
1d1ffb87 | 1147 | debug("client_input_channel_req: rtype %s reply %d", rtype, reply); |
8ce64345 | 1148 | |
1149 | c = channel_lookup(id); | |
1150 | if (c == NULL) | |
bcbf86ec | 1151 | fatal("client_input_channel_req: channel %d: bad channel", id); |
8ce64345 | 1152 | |
1153 | if (session_ident == -1) { | |
1154 | error("client_input_channel_req: no channel %d", id); | |
1155 | } else if (id != session_ident) { | |
1156 | error("client_input_channel_req: bad channel %d != %d", | |
1157 | id, session_ident); | |
1158 | } else if (strcmp(rtype, "exit-status") == 0) { | |
1159 | success = 1; | |
1160 | exit_status = packet_get_int(); | |
6ae2364d | 1161 | packet_done(); |
8ce64345 | 1162 | } |
1163 | if (reply) { | |
1164 | packet_start(success ? | |
1165 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1166 | packet_put_int(c->remote_id); | |
1167 | packet_send(); | |
1168 | } | |
1169 | xfree(rtype); | |
1170 | } | |
1171 | ||
1172 | void | |
1173 | client_set_session_ident(int id) | |
1174 | { | |
1175 | debug("client_set_session_ident: id %d", id); | |
1176 | session_ident = id; | |
1177 | channel_register_callback(id, SSH2_MSG_CHANNEL_REQUEST, | |
1178 | client_input_channel_req, (void *)0); | |
1179 | } |