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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. |
a96070d4 | 38 | * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 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" | |
e0ae8728 | 62 | RCSID("$OpenBSD: clientloop.c,v 1.100 2002/04/22 21:04:52 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" |
a5efa1bb | 71 | #include "channels.h" |
7368a6c8 | 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" | |
30dcc918 | 82 | #include "sshtty.h" |
e968270c | 83 | #include "misc.h" |
c53c54c2 | 84 | #include "readpass.h" |
a22aff1f | 85 | |
86 | /* import options */ | |
87 | extern Options options; | |
88 | ||
8efc0c15 | 89 | /* Flag indicating that stdin should be redirected from /dev/null. */ |
90 | extern int stdin_null_flag; | |
91 | ||
aa3378df | 92 | /* |
93 | * Name of the host we are connecting to. This is the name given on the | |
94 | * command line, or the HostName specified for the user-supplied name in a | |
95 | * configuration file. | |
96 | */ | |
8efc0c15 | 97 | extern char *host; |
98 | ||
aa3378df | 99 | /* |
100 | * Flag to indicate that we have received a window change signal which has | |
101 | * not yet been processed. This will cause a message indicating the new | |
102 | * window size to be sent to the server a little later. This is volatile | |
103 | * because this is updated in a signal handler. | |
104 | */ | |
7a934d1b | 105 | static volatile sig_atomic_t received_window_change_signal = 0; |
106 | static volatile sig_atomic_t received_signal = 0; | |
8efc0c15 | 107 | |
8efc0c15 | 108 | /* Flag indicating whether the user\'s terminal is in non-blocking mode. */ |
109 | static int in_non_blocking_mode = 0; | |
110 | ||
111 | /* Common data for the client loop code. */ | |
2e73a022 | 112 | static int quit_pending; /* Set to non-zero to quit the client loop. */ |
113 | static int escape_char; /* Escape character. */ | |
5260325f | 114 | static int escape_pending; /* Last character was the escape character */ |
115 | static int last_was_cr; /* Last character was a newline. */ | |
116 | static int exit_status; /* Used to store the exit status of the command. */ | |
117 | static int stdin_eof; /* EOF has been encountered on standard error. */ | |
118 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
119 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
120 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
1e3b8b07 | 121 | static u_long stdin_bytes, stdout_bytes, stderr_bytes; |
122 | static u_int buffer_high;/* Soft max buffer size. */ | |
5260325f | 123 | static int connection_in; /* Connection to server (input). */ |
124 | static int connection_out; /* Connection to server (output). */ | |
c422989b | 125 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ |
eb0dd41f | 126 | static int session_closed = 0; /* In SSH2: login session closed. */ |
8efc0c15 | 127 | |
396c147e | 128 | static void client_init_dispatch(void); |
8ce64345 | 129 | int session_ident = -1; |
130 | ||
e092ce67 | 131 | /*XXX*/ |
132 | extern Kex *xxx_kex; | |
133 | ||
8efc0c15 | 134 | /* Restores stdin to blocking mode. */ |
135 | ||
396c147e | 136 | static void |
5ca51e19 | 137 | leave_non_blocking(void) |
8efc0c15 | 138 | { |
5260325f | 139 | if (in_non_blocking_mode) { |
140 | (void) fcntl(fileno(stdin), F_SETFL, 0); | |
141 | in_non_blocking_mode = 0; | |
142 | fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL); | |
143 | } | |
8efc0c15 | 144 | } |
145 | ||
5260325f | 146 | /* Puts stdin terminal in non-blocking mode. */ |
147 | ||
396c147e | 148 | static void |
5ca51e19 | 149 | enter_non_blocking(void) |
8efc0c15 | 150 | { |
5260325f | 151 | in_non_blocking_mode = 1; |
152 | (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK); | |
153 | fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL); | |
8efc0c15 | 154 | } |
155 | ||
aa3378df | 156 | /* |
157 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
158 | * flag indicating that the window has changed. | |
159 | */ | |
8efc0c15 | 160 | |
396c147e | 161 | static void |
5260325f | 162 | window_change_handler(int sig) |
8efc0c15 | 163 | { |
5260325f | 164 | received_window_change_signal = 1; |
165 | signal(SIGWINCH, window_change_handler); | |
8efc0c15 | 166 | } |
167 | ||
aa3378df | 168 | /* |
169 | * Signal handler for signals that cause the program to terminate. These | |
170 | * signals must be trapped to restore terminal modes. | |
171 | */ | |
8efc0c15 | 172 | |
396c147e | 173 | static void |
5260325f | 174 | signal_handler(int sig) |
8efc0c15 | 175 | { |
c9130033 | 176 | received_signal = sig; |
177 | quit_pending = 1; | |
8efc0c15 | 178 | } |
179 | ||
aa3378df | 180 | /* |
181 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
182 | * available resolution. | |
183 | */ | |
8efc0c15 | 184 | |
396c147e | 185 | static double |
5ca51e19 | 186 | get_current_time(void) |
8efc0c15 | 187 | { |
5260325f | 188 | struct timeval tv; |
189 | gettimeofday(&tv, NULL); | |
190 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
8efc0c15 | 191 | } |
192 | ||
aa3378df | 193 | /* |
194 | * This is called when the interactive is entered. This checks if there is | |
195 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
196 | * not appear to wake up when redirecting from /dev/null. | |
197 | */ | |
8efc0c15 | 198 | |
396c147e | 199 | static void |
5ca51e19 | 200 | client_check_initial_eof_on_stdin(void) |
8efc0c15 | 201 | { |
5260325f | 202 | int len; |
203 | char buf[1]; | |
204 | ||
aa3378df | 205 | /* |
206 | * If standard input is to be "redirected from /dev/null", we simply | |
207 | * mark that we have seen an EOF and send an EOF message to the | |
208 | * server. Otherwise, we try to read a single character; it appears | |
209 | * that for some files, such /dev/null, select() never wakes up for | |
210 | * read for this descriptor, which means that we never get EOF. This | |
211 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
212 | */ | |
5260325f | 213 | if (stdin_null_flag) { |
214 | /* Fake EOF on stdin. */ | |
215 | debug("Sending eof."); | |
216 | stdin_eof = 1; | |
217 | packet_start(SSH_CMSG_EOF); | |
218 | packet_send(); | |
219 | } else { | |
5260325f | 220 | enter_non_blocking(); |
221 | ||
222 | /* Check for immediate EOF on stdin. */ | |
223 | len = read(fileno(stdin), buf, 1); | |
224 | if (len == 0) { | |
aa3378df | 225 | /* EOF. Record that we have seen it and send EOF to server. */ |
5260325f | 226 | debug("Sending eof."); |
227 | stdin_eof = 1; | |
228 | packet_start(SSH_CMSG_EOF); | |
229 | packet_send(); | |
230 | } else if (len > 0) { | |
aa3378df | 231 | /* |
232 | * Got data. We must store the data in the buffer, | |
233 | * and also process it as an escape character if | |
234 | * appropriate. | |
235 | */ | |
1e3b8b07 | 236 | if ((u_char) buf[0] == escape_char) |
5260325f | 237 | escape_pending = 1; |
7e8911cd | 238 | else |
5260325f | 239 | buffer_append(&stdin_buffer, buf, 1); |
5260325f | 240 | } |
5260325f | 241 | leave_non_blocking(); |
8efc0c15 | 242 | } |
8efc0c15 | 243 | } |
244 | ||
8efc0c15 | 245 | |
aa3378df | 246 | /* |
247 | * Make packets from buffered stdin data, and buffer them for sending to the | |
248 | * connection. | |
249 | */ | |
8efc0c15 | 250 | |
396c147e | 251 | static void |
5ca51e19 | 252 | client_make_packets_from_stdin_data(void) |
8efc0c15 | 253 | { |
1e3b8b07 | 254 | u_int len; |
5260325f | 255 | |
256 | /* Send buffered stdin data to the server. */ | |
257 | while (buffer_len(&stdin_buffer) > 0 && | |
184eed6a | 258 | packet_not_very_much_data_to_write()) { |
5260325f | 259 | len = buffer_len(&stdin_buffer); |
260 | /* Keep the packets at reasonable size. */ | |
261 | if (len > packet_get_maxsize()) | |
262 | len = packet_get_maxsize(); | |
263 | packet_start(SSH_CMSG_STDIN_DATA); | |
264 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
265 | packet_send(); | |
266 | buffer_consume(&stdin_buffer, len); | |
7e8911cd | 267 | stdin_bytes += len; |
5260325f | 268 | /* If we have a pending EOF, send it now. */ |
269 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
270 | packet_start(SSH_CMSG_EOF); | |
271 | packet_send(); | |
272 | } | |
8efc0c15 | 273 | } |
8efc0c15 | 274 | } |
275 | ||
aa3378df | 276 | /* |
277 | * Checks if the client window has changed, and sends a packet about it to | |
278 | * the server if so. The actual change is detected elsewhere (by a software | |
279 | * interrupt on Unix); this just checks the flag and sends a message if | |
280 | * appropriate. | |
281 | */ | |
8efc0c15 | 282 | |
396c147e | 283 | static void |
5ca51e19 | 284 | client_check_window_change(void) |
8efc0c15 | 285 | { |
8ce64345 | 286 | struct winsize ws; |
287 | ||
288 | if (! received_window_change_signal) | |
289 | return; | |
290 | /** XXX race */ | |
291 | received_window_change_signal = 0; | |
292 | ||
293 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
294 | return; | |
295 | ||
de273eef | 296 | debug2("client_check_window_change: changed"); |
8ce64345 | 297 | |
298 | if (compat20) { | |
299 | channel_request_start(session_ident, "window-change", 0); | |
300 | packet_put_int(ws.ws_col); | |
301 | packet_put_int(ws.ws_row); | |
302 | packet_put_int(ws.ws_xpixel); | |
303 | packet_put_int(ws.ws_ypixel); | |
304 | packet_send(); | |
305 | } else { | |
306 | packet_start(SSH_CMSG_WINDOW_SIZE); | |
307 | packet_put_int(ws.ws_row); | |
308 | packet_put_int(ws.ws_col); | |
309 | packet_put_int(ws.ws_xpixel); | |
310 | packet_put_int(ws.ws_ypixel); | |
311 | packet_send(); | |
8efc0c15 | 312 | } |
8efc0c15 | 313 | } |
314 | ||
aa3378df | 315 | /* |
316 | * Waits until the client can do something (some data becomes available on | |
317 | * one of the file descriptors). | |
318 | */ | |
8efc0c15 | 319 | |
396c147e | 320 | static void |
39929cdb | 321 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
489aa2e9 | 322 | int *maxfdp, int *nallocp, int rekeying) |
8efc0c15 | 323 | { |
39929cdb | 324 | /* Add any selections by the channel mechanism. */ |
489aa2e9 | 325 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); |
5260325f | 326 | |
8ce64345 | 327 | if (!compat20) { |
328 | /* Read from the connection, unless our buffers are full. */ | |
329 | if (buffer_len(&stdout_buffer) < buffer_high && | |
330 | buffer_len(&stderr_buffer) < buffer_high && | |
331 | channel_not_very_much_buffered_data()) | |
39929cdb | 332 | FD_SET(connection_in, *readsetp); |
8ce64345 | 333 | /* |
334 | * Read from stdin, unless we have seen EOF or have very much | |
335 | * buffered data to send to the server. | |
336 | */ | |
337 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
39929cdb | 338 | FD_SET(fileno(stdin), *readsetp); |
8ce64345 | 339 | |
340 | /* Select stdout/stderr if have data in buffer. */ | |
341 | if (buffer_len(&stdout_buffer) > 0) | |
39929cdb | 342 | FD_SET(fileno(stdout), *writesetp); |
8ce64345 | 343 | if (buffer_len(&stderr_buffer) > 0) |
39929cdb | 344 | FD_SET(fileno(stderr), *writesetp); |
8ce64345 | 345 | } else { |
24b6b45f | 346 | /* channel_prepare_select could have closed the last channel */ |
fd6cfbaf | 347 | if (session_closed && !channel_still_open() && |
348 | !packet_have_data_to_write()) { | |
349 | /* clear mask since we did not call select() */ | |
b3ad8fe6 | 350 | memset(*readsetp, 0, *nallocp); |
351 | memset(*writesetp, 0, *nallocp); | |
fd6cfbaf | 352 | return; |
24b6b45f | 353 | } else { |
354 | FD_SET(connection_in, *readsetp); | |
355 | } | |
8ce64345 | 356 | } |
5260325f | 357 | |
5260325f | 358 | /* Select server connection if have data to write to the server. */ |
359 | if (packet_have_data_to_write()) | |
39929cdb | 360 | FD_SET(connection_out, *writesetp); |
5260325f | 361 | |
aa3378df | 362 | /* |
363 | * Wait for something to happen. This will suspend the process until | |
364 | * some selected descriptor can be read, written, or has some other | |
365 | * event pending. Note: if you want to implement SSH_MSG_IGNORE | |
366 | * messages to fool traffic analysis, this might be the place to do | |
367 | * it: just have a random timeout for the select, and send a random | |
368 | * SSH_MSG_IGNORE packet when the timeout expires. | |
369 | */ | |
5260325f | 370 | |
39929cdb | 371 | if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) { |
5260325f | 372 | char buf[100]; |
fd193ca4 | 373 | |
374 | /* | |
375 | * We have to clear the select masks, because we return. | |
376 | * We have to return, because the mainloop checks for the flags | |
377 | * set by the signal handlers. | |
378 | */ | |
b3ad8fe6 | 379 | memset(*readsetp, 0, *nallocp); |
380 | memset(*writesetp, 0, *nallocp); | |
fd193ca4 | 381 | |
5260325f | 382 | if (errno == EINTR) |
383 | return; | |
384 | /* Note: we might still have data in the buffers. */ | |
385 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
386 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 387 | quit_pending = 1; |
388 | } | |
8efc0c15 | 389 | } |
390 | ||
396c147e | 391 | static void |
2e73a022 | 392 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
8efc0c15 | 393 | { |
5260325f | 394 | struct winsize oldws, newws; |
395 | ||
396 | /* Flush stdout and stderr buffers. */ | |
2e73a022 | 397 | if (buffer_len(bout) > 0) |
398 | atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); | |
399 | if (buffer_len(berr) > 0) | |
400 | atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); | |
5260325f | 401 | |
5260325f | 402 | leave_raw_mode(); |
403 | ||
aa3378df | 404 | /* |
405 | * Free (and clear) the buffer to reduce the amount of data that gets | |
406 | * written to swap. | |
407 | */ | |
2e73a022 | 408 | buffer_free(bin); |
409 | buffer_free(bout); | |
410 | buffer_free(berr); | |
5260325f | 411 | |
412 | /* Save old window size. */ | |
413 | ioctl(fileno(stdin), TIOCGWINSZ, &oldws); | |
414 | ||
415 | /* Send the suspend signal to the program itself. */ | |
416 | kill(getpid(), SIGTSTP); | |
417 | ||
418 | /* Check if the window size has changed. */ | |
419 | if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 && | |
420 | (oldws.ws_row != newws.ws_row || | |
184eed6a | 421 | oldws.ws_col != newws.ws_col || |
422 | oldws.ws_xpixel != newws.ws_xpixel || | |
423 | oldws.ws_ypixel != newws.ws_ypixel)) | |
5260325f | 424 | received_window_change_signal = 1; |
425 | ||
426 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
2e73a022 | 427 | buffer_init(bin); |
428 | buffer_init(bout); | |
429 | buffer_init(berr); | |
5260325f | 430 | |
5260325f | 431 | enter_raw_mode(); |
8efc0c15 | 432 | } |
433 | ||
396c147e | 434 | static void |
8ce64345 | 435 | client_process_net_input(fd_set * readset) |
8efc0c15 | 436 | { |
8ce64345 | 437 | int len; |
438 | char buf[8192]; | |
5260325f | 439 | |
aa3378df | 440 | /* |
441 | * Read input from the server, and add any such data to the buffer of | |
442 | * the packet subsystem. | |
443 | */ | |
5260325f | 444 | if (FD_ISSET(connection_in, readset)) { |
445 | /* Read as much as possible. */ | |
446 | len = read(connection_in, buf, sizeof(buf)); | |
447 | if (len == 0) { | |
448 | /* Received EOF. The remote host has closed the connection. */ | |
449 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
450 | host); | |
8efc0c15 | 451 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
8efc0c15 | 452 | quit_pending = 1; |
453 | return; | |
5260325f | 454 | } |
aa3378df | 455 | /* |
456 | * There is a kernel bug on Solaris that causes select to | |
457 | * sometimes wake up even though there is no data available. | |
458 | */ | |
09cb311c | 459 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
5260325f | 460 | len = 0; |
461 | ||
462 | if (len < 0) { | |
463 | /* An error has encountered. Perhaps there is a network problem. */ | |
464 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
465 | host, strerror(errno)); | |
466 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 467 | quit_pending = 1; |
468 | return; | |
469 | } | |
470 | packet_process_incoming(buf, len); | |
471 | } | |
8ce64345 | 472 | } |
473 | ||
c53c54c2 | 474 | static void |
ec9b7086 | 475 | process_cmdline(void) |
c53c54c2 | 476 | { |
c53c54c2 | 477 | void (*handler)(int); |
478 | char *s, *cmd; | |
479 | u_short fwd_port, fwd_host_port; | |
480 | char buf[1024], sfwd_port[6], sfwd_host_port[6]; | |
481 | int local = 0; | |
c53c54c2 | 482 | |
483 | leave_raw_mode(); | |
875ec275 | 484 | handler = signal(SIGINT, SIG_IGN); |
ec9b7086 | 485 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
c53c54c2 | 486 | if (s == NULL) |
487 | goto out; | |
c53c54c2 | 488 | while (*s && isspace(*s)) |
489 | s++; | |
c53c54c2 | 490 | if (*s == 0) |
491 | goto out; | |
c53c54c2 | 492 | if (strlen(s) < 2 || s[0] != '-' || !(s[1] == 'L' || s[1] == 'R')) { |
ec9b7086 | 493 | log("Invalid command."); |
c53c54c2 | 494 | goto out; |
495 | } | |
496 | if (s[1] == 'L') | |
497 | local = 1; | |
498 | if (!local && !compat20) { | |
ec9b7086 | 499 | log("Not supported for SSH protocol version 1."); |
c53c54c2 | 500 | goto out; |
501 | } | |
c53c54c2 | 502 | s += 2; |
503 | while (*s && isspace(*s)) | |
504 | s++; | |
505 | ||
506 | if (sscanf(s, "%5[0-9]:%255[^:]:%5[0-9]", | |
507 | sfwd_port, buf, sfwd_host_port) != 3 && | |
508 | sscanf(s, "%5[0-9]/%255[^/]/%5[0-9]", | |
509 | sfwd_port, buf, sfwd_host_port) != 3) { | |
ec9b7086 | 510 | log("Bad forwarding specification."); |
c53c54c2 | 511 | goto out; |
512 | } | |
513 | if ((fwd_port = a2port(sfwd_port)) == 0 || | |
514 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { | |
ec9b7086 | 515 | log("Bad forwarding port(s)."); |
c53c54c2 | 516 | goto out; |
517 | } | |
518 | if (local) { | |
ec9b7086 | 519 | if (channel_setup_local_fwd_listener(fwd_port, buf, |
520 | fwd_host_port, options.gateway_ports) < 0) { | |
521 | log("Port forwarding failed."); | |
c53c54c2 | 522 | goto out; |
523 | } | |
524 | } else | |
525 | channel_request_remote_forwarding(fwd_port, buf, | |
526 | fwd_host_port); | |
ec9b7086 | 527 | log("Forwarding port."); |
c53c54c2 | 528 | out: |
529 | signal(SIGINT, handler); | |
530 | enter_raw_mode(); | |
531 | if (cmd) | |
532 | xfree(cmd); | |
533 | } | |
534 | ||
2e73a022 | 535 | /* process the characters one by one */ |
396c147e | 536 | static int |
2e73a022 | 537 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) |
538 | { | |
539 | char string[1024]; | |
540 | pid_t pid; | |
541 | int bytes = 0; | |
1e3b8b07 | 542 | u_int i; |
543 | u_char ch; | |
2e73a022 | 544 | char *s; |
545 | ||
546 | for (i = 0; i < len; i++) { | |
547 | /* Get one character at a time. */ | |
548 | ch = buf[i]; | |
549 | ||
550 | if (escape_pending) { | |
551 | /* We have previously seen an escape character. */ | |
552 | /* Clear the flag now. */ | |
553 | escape_pending = 0; | |
554 | ||
555 | /* Process the escaped character. */ | |
556 | switch (ch) { | |
557 | case '.': | |
558 | /* Terminate the connection. */ | |
559 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
560 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 561 | |
562 | quit_pending = 1; | |
563 | return -1; | |
564 | ||
565 | case 'Z' - 64: | |
566 | /* Suspend the program. */ | |
567 | /* Print a message to that effect to the user. */ | |
568 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
569 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 570 | |
571 | /* Restore terminal modes and suspend. */ | |
572 | client_suspend_self(bin, bout, berr); | |
573 | ||
574 | /* We have been continued. */ | |
575 | continue; | |
576 | ||
e092ce67 | 577 | case 'R': |
54506d2e | 578 | if (compat20) { |
579 | if (datafellows & SSH_BUG_NOREKEY) | |
580 | log("Server does not support re-keying"); | |
581 | else | |
582 | need_rekeying = 1; | |
583 | } | |
e092ce67 | 584 | continue; |
585 | ||
2e73a022 | 586 | case '&': |
2e73a022 | 587 | /* |
588 | * Detach the program (continue to serve connections, | |
589 | * but put in background and no more new connections). | |
590 | */ | |
2e73a022 | 591 | /* Restore tty modes. */ |
592 | leave_raw_mode(); | |
593 | ||
594 | /* Stop listening for new connections. */ | |
c6940381 | 595 | channel_stop_listening(); |
2e73a022 | 596 | |
c6940381 | 597 | snprintf(string, sizeof string, |
598 | "%c& [backgrounded]\n", escape_char); | |
599 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 600 | |
601 | /* Fork into background. */ | |
602 | pid = fork(); | |
603 | if (pid < 0) { | |
604 | error("fork: %.100s", strerror(errno)); | |
605 | continue; | |
606 | } | |
607 | if (pid != 0) { /* This is the parent. */ | |
608 | /* The parent just exits. */ | |
609 | exit(0); | |
610 | } | |
611 | /* The child continues serving connections. */ | |
c6940381 | 612 | if (compat20) { |
613 | buffer_append(bin, "\004", 1); | |
614 | /* fake EOF on stdin */ | |
615 | return -1; | |
616 | } else if (!stdin_eof) { | |
617 | /* | |
618 | * Sending SSH_CMSG_EOF alone does not always appear | |
619 | * to be enough. So we try to send an EOF character | |
620 | * first. | |
621 | */ | |
622 | packet_start(SSH_CMSG_STDIN_DATA); | |
623 | packet_put_string("\004", 1); | |
624 | packet_send(); | |
625 | /* Close stdin. */ | |
626 | stdin_eof = 1; | |
627 | if (buffer_len(bin) == 0) { | |
628 | packet_start(SSH_CMSG_EOF); | |
629 | packet_send(); | |
630 | } | |
631 | } | |
632 | continue; | |
2e73a022 | 633 | |
634 | case '?': | |
635 | snprintf(string, sizeof string, | |
636 | "%c?\r\n\ | |
637 | Supported escape sequences:\r\n\ | |
638 | ~. - terminate connection\r\n\ | |
c53c54c2 | 639 | ~C - open a command line\r\n\ |
4bf9c10e | 640 | ~R - Request rekey (SSH protocol 2 only)\r\n\ |
2e73a022 | 641 | ~^Z - suspend ssh\r\n\ |
642 | ~# - list forwarded connections\r\n\ | |
643 | ~& - background ssh (when waiting for connections to terminate)\r\n\ | |
644 | ~? - this message\r\n\ | |
645 | ~~ - send the escape character by typing it twice\r\n\ | |
646 | (Note that escapes are only recognized immediately after newline.)\r\n", | |
647 | escape_char); | |
648 | buffer_append(berr, string, strlen(string)); | |
649 | continue; | |
650 | ||
651 | case '#': | |
652 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
653 | buffer_append(berr, string, strlen(string)); | |
654 | s = channel_open_message(); | |
655 | buffer_append(berr, s, strlen(s)); | |
656 | xfree(s); | |
657 | continue; | |
658 | ||
c53c54c2 | 659 | case 'C': |
ec9b7086 | 660 | process_cmdline(); |
c53c54c2 | 661 | continue; |
662 | ||
2e73a022 | 663 | default: |
664 | if (ch != escape_char) { | |
665 | buffer_put_char(bin, escape_char); | |
666 | bytes++; | |
667 | } | |
668 | /* Escaped characters fall through here */ | |
669 | break; | |
670 | } | |
671 | } else { | |
672 | /* | |
673 | * The previous character was not an escape char. Check if this | |
674 | * is an escape. | |
675 | */ | |
676 | if (last_was_cr && ch == escape_char) { | |
677 | /* It is. Set the flag and continue to next character. */ | |
678 | escape_pending = 1; | |
679 | continue; | |
680 | } | |
681 | } | |
682 | ||
683 | /* | |
684 | * Normal character. Record whether it was a newline, | |
685 | * and append it to the buffer. | |
686 | */ | |
687 | last_was_cr = (ch == '\r' || ch == '\n'); | |
688 | buffer_put_char(bin, ch); | |
689 | bytes++; | |
690 | } | |
691 | return bytes; | |
692 | } | |
693 | ||
396c147e | 694 | static void |
8ce64345 | 695 | client_process_input(fd_set * readset) |
696 | { | |
9da5c3c9 | 697 | int len; |
2e73a022 | 698 | char buf[8192]; |
8ce64345 | 699 | |
5260325f | 700 | /* Read input from stdin. */ |
701 | if (FD_ISSET(fileno(stdin), readset)) { | |
702 | /* Read as much as possible. */ | |
703 | len = read(fileno(stdin), buf, sizeof(buf)); | |
cf6bc93c | 704 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
705 | return; /* we'll try again later */ | |
5260325f | 706 | if (len <= 0) { |
aa3378df | 707 | /* |
708 | * Received EOF or error. They are treated | |
709 | * similarly, except that an error message is printed | |
710 | * if it was an error condition. | |
711 | */ | |
5260325f | 712 | if (len < 0) { |
713 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
714 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 715 | } |
716 | /* Mark that we have seen EOF. */ | |
717 | stdin_eof = 1; | |
aa3378df | 718 | /* |
719 | * Send an EOF message to the server unless there is | |
720 | * data in the buffer. If there is data in the | |
721 | * buffer, no message will be sent now. Code | |
722 | * elsewhere will send the EOF when the buffer | |
723 | * becomes empty if stdin_eof is set. | |
724 | */ | |
5260325f | 725 | if (buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 726 | packet_start(SSH_CMSG_EOF); |
727 | packet_send(); | |
5260325f | 728 | } |
4bf9c10e | 729 | } else if (escape_char == SSH_ESCAPECHAR_NONE) { |
aa3378df | 730 | /* |
731 | * Normal successful read, and no escape character. | |
732 | * Just append the data to buffer. | |
733 | */ | |
5260325f | 734 | buffer_append(&stdin_buffer, buf, len); |
5260325f | 735 | } else { |
aa3378df | 736 | /* |
737 | * Normal, successful read. But we have an escape character | |
738 | * and have to process the characters one by one. | |
739 | */ | |
7e8911cd | 740 | if (process_escapes(&stdin_buffer, &stdout_buffer, |
741 | &stderr_buffer, buf, len) == -1) | |
2e73a022 | 742 | return; |
5260325f | 743 | } |
744 | } | |
8efc0c15 | 745 | } |
746 | ||
396c147e | 747 | static void |
5260325f | 748 | client_process_output(fd_set * writeset) |
8efc0c15 | 749 | { |
5260325f | 750 | int len; |
751 | char buf[100]; | |
752 | ||
753 | /* Write buffered output to stdout. */ | |
754 | if (FD_ISSET(fileno(stdout), writeset)) { | |
755 | /* Write as much data as possible. */ | |
756 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 757 | buffer_len(&stdout_buffer)); |
5260325f | 758 | if (len <= 0) { |
cf6bc93c | 759 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 760 | len = 0; |
761 | else { | |
aa3378df | 762 | /* |
763 | * An error or EOF was encountered. Put an | |
764 | * error message to stderr buffer. | |
765 | */ | |
5260325f | 766 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
767 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 768 | quit_pending = 1; |
769 | return; | |
770 | } | |
771 | } | |
772 | /* Consume printed data from the buffer. */ | |
773 | buffer_consume(&stdout_buffer, len); | |
cd332296 | 774 | stdout_bytes += len; |
5260325f | 775 | } |
776 | /* Write buffered output to stderr. */ | |
777 | if (FD_ISSET(fileno(stderr), writeset)) { | |
778 | /* Write as much data as possible. */ | |
779 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 780 | buffer_len(&stderr_buffer)); |
5260325f | 781 | if (len <= 0) { |
cf6bc93c | 782 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 783 | len = 0; |
784 | else { | |
aa3378df | 785 | /* EOF or error, but can't even print error message. */ |
5260325f | 786 | quit_pending = 1; |
787 | return; | |
788 | } | |
789 | } | |
790 | /* Consume printed characters from the buffer. */ | |
791 | buffer_consume(&stderr_buffer, len); | |
cd332296 | 792 | stderr_bytes += len; |
8efc0c15 | 793 | } |
8efc0c15 | 794 | } |
795 | ||
7368a6c8 | 796 | /* |
797 | * Get packets from the connection input buffer, and process them as long as | |
798 | * there are packets available. | |
799 | * | |
800 | * Any unknown packets received during the actual | |
801 | * session cause the session to terminate. This is | |
802 | * intended to make debugging easier since no | |
803 | * confirmations are sent. Any compatible protocol | |
804 | * extensions must be negotiated during the | |
805 | * preparatory phase. | |
806 | */ | |
807 | ||
396c147e | 808 | static void |
5ca51e19 | 809 | client_process_buffered_input_packets(void) |
7368a6c8 | 810 | { |
e092ce67 | 811 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); |
7368a6c8 | 812 | } |
813 | ||
2e73a022 | 814 | /* scan buf[] for '~' before sending data to the peer */ |
815 | ||
396c147e | 816 | static int |
2e73a022 | 817 | simple_escape_filter(Channel *c, char *buf, int len) |
818 | { | |
819 | /* XXX we assume c->extended is writeable */ | |
820 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
821 | } | |
822 | ||
396c147e | 823 | static void |
eb0dd41f | 824 | client_channel_closed(int id, void *arg) |
825 | { | |
826 | if (id != session_ident) | |
827 | error("client_channel_closed: id %d != session_ident %d", | |
828 | id, session_ident); | |
418e724c | 829 | channel_cancel_cleanup(id); |
eb0dd41f | 830 | session_closed = 1; |
30dcc918 | 831 | if (in_raw_mode()) |
d0a4c20b | 832 | leave_raw_mode(); |
eb0dd41f | 833 | } |
834 | ||
aa3378df | 835 | /* |
836 | * Implements the interactive session with the server. This is called after | |
837 | * the user has been authenticated, and a command has been started on the | |
4bf9c10e | 838 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character |
839 | * used as an escape character for terminating or suspending the session. | |
aa3378df | 840 | */ |
8efc0c15 | 841 | |
6ae2364d | 842 | int |
2e73a022 | 843 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
8efc0c15 | 844 | { |
39929cdb | 845 | fd_set *readset = NULL, *writeset = NULL; |
5260325f | 846 | double start_time, total_time; |
489aa2e9 | 847 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0, nalloc = 0; |
5260325f | 848 | char buf[100]; |
849 | ||
850 | debug("Entering interactive session."); | |
851 | ||
852 | start_time = get_current_time(); | |
853 | ||
854 | /* Initialize variables. */ | |
855 | escape_pending = 0; | |
856 | last_was_cr = 1; | |
857 | exit_status = -1; | |
858 | stdin_eof = 0; | |
859 | buffer_high = 64 * 1024; | |
860 | connection_in = packet_get_connection_in(); | |
861 | connection_out = packet_get_connection_out(); | |
39929cdb | 862 | max_fd = MAX(connection_in, connection_out); |
863 | ||
864 | if (!compat20) { | |
e968270c | 865 | /* enable nonblocking unless tty */ |
866 | if (!isatty(fileno(stdin))) | |
867 | set_nonblock(fileno(stdin)); | |
868 | if (!isatty(fileno(stdout))) | |
869 | set_nonblock(fileno(stdout)); | |
870 | if (!isatty(fileno(stderr))) | |
871 | set_nonblock(fileno(stderr)); | |
39929cdb | 872 | max_fd = MAX(max_fd, fileno(stdin)); |
873 | max_fd = MAX(max_fd, fileno(stdout)); | |
874 | max_fd = MAX(max_fd, fileno(stderr)); | |
875 | } | |
5260325f | 876 | stdin_bytes = 0; |
877 | stdout_bytes = 0; | |
878 | stderr_bytes = 0; | |
879 | quit_pending = 0; | |
880 | escape_char = escape_char_arg; | |
881 | ||
882 | /* Initialize buffers. */ | |
883 | buffer_init(&stdin_buffer); | |
884 | buffer_init(&stdout_buffer); | |
885 | buffer_init(&stderr_buffer); | |
886 | ||
7368a6c8 | 887 | client_init_dispatch(); |
888 | ||
5260325f | 889 | /* Set signal handlers to restore non-blocking mode. */ |
890 | signal(SIGINT, signal_handler); | |
891 | signal(SIGQUIT, signal_handler); | |
892 | signal(SIGTERM, signal_handler); | |
5260325f | 893 | if (have_pty) |
894 | signal(SIGWINCH, window_change_handler); | |
895 | ||
5260325f | 896 | if (have_pty) |
897 | enter_raw_mode(); | |
898 | ||
1fc8ccdf | 899 | if (compat20) { |
900 | session_ident = ssh2_chan_id; | |
4bf9c10e | 901 | if (escape_char != SSH_ESCAPECHAR_NONE) |
1fc8ccdf | 902 | channel_register_filter(session_ident, |
903 | simple_escape_filter); | |
eb0dd41f | 904 | if (session_ident != -1) |
905 | channel_register_cleanup(session_ident, | |
906 | client_channel_closed); | |
1fc8ccdf | 907 | } else { |
908 | /* Check if we should immediately send eof on stdin. */ | |
8ce64345 | 909 | client_check_initial_eof_on_stdin(); |
1fc8ccdf | 910 | } |
2e73a022 | 911 | |
5260325f | 912 | /* Main loop of the client for the interactive session mode. */ |
913 | while (!quit_pending) { | |
5260325f | 914 | |
aa3378df | 915 | /* Process buffered packets sent by the server. */ |
5260325f | 916 | client_process_buffered_input_packets(); |
917 | ||
eb0dd41f | 918 | if (compat20 && session_closed && !channel_still_open()) |
8ce64345 | 919 | break; |
eb0dd41f | 920 | |
921 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
8ce64345 | 922 | |
c422989b | 923 | if (rekeying) { |
924 | debug("rekeying in progress"); | |
925 | } else { | |
926 | /* | |
927 | * Make packets of buffered stdin data, and buffer | |
928 | * them for sending to the server. | |
929 | */ | |
930 | if (!compat20) | |
931 | client_make_packets_from_stdin_data(); | |
5260325f | 932 | |
c422989b | 933 | /* |
934 | * Make packets from buffered channel data, and | |
935 | * enqueue them for sending to the server. | |
936 | */ | |
937 | if (packet_not_very_much_data_to_write()) | |
938 | channel_output_poll(); | |
5260325f | 939 | |
c422989b | 940 | /* |
941 | * Check if the window size has changed, and buffer a | |
942 | * message about it to the server if so. | |
943 | */ | |
944 | client_check_window_change(); | |
5260325f | 945 | |
c422989b | 946 | if (quit_pending) |
947 | break; | |
948 | } | |
aa3378df | 949 | /* |
950 | * Wait until we have something to do (something becomes | |
951 | * available on one of the descriptors). | |
952 | */ | |
489aa2e9 | 953 | max_fd2 = max_fd; |
c422989b | 954 | client_wait_until_can_do_something(&readset, &writeset, |
489aa2e9 | 955 | &max_fd2, &nalloc, rekeying); |
5260325f | 956 | |
957 | if (quit_pending) | |
958 | break; | |
959 | ||
c422989b | 960 | /* Do channel operations unless rekeying in progress. */ |
961 | if (!rekeying) { | |
962 | channel_after_select(readset, writeset); | |
963 | ||
964 | if (need_rekeying) { | |
965 | debug("user requests rekeying"); | |
966 | xxx_kex->done = 0; | |
967 | kex_send_kexinit(xxx_kex); | |
968 | need_rekeying = 0; | |
969 | } | |
970 | } | |
5260325f | 971 | |
8ce64345 | 972 | /* Buffer input from the connection. */ |
39929cdb | 973 | client_process_net_input(readset); |
5260325f | 974 | |
8ce64345 | 975 | if (quit_pending) |
976 | break; | |
977 | ||
978 | if (!compat20) { | |
979 | /* Buffer data from stdin */ | |
39929cdb | 980 | client_process_input(readset); |
8ce64345 | 981 | /* |
982 | * Process output to stdout and stderr. Output to | |
983 | * the connection is processed elsewhere (above). | |
984 | */ | |
39929cdb | 985 | client_process_output(writeset); |
8ce64345 | 986 | } |
5260325f | 987 | |
aa3378df | 988 | /* Send as much buffered packet data as possible to the sender. */ |
39929cdb | 989 | if (FD_ISSET(connection_out, writeset)) |
5260325f | 990 | packet_write_poll(); |
991 | } | |
39929cdb | 992 | if (readset) |
993 | xfree(readset); | |
994 | if (writeset) | |
995 | xfree(writeset); | |
5260325f | 996 | |
997 | /* Terminate the session. */ | |
998 | ||
999 | /* Stop watching for window change. */ | |
1000 | if (have_pty) | |
1001 | signal(SIGWINCH, SIG_DFL); | |
1002 | ||
d6746a0b | 1003 | channel_free_all(); |
5260325f | 1004 | |
c9130033 | 1005 | if (have_pty) |
1006 | leave_raw_mode(); | |
89aa792b | 1007 | |
1008 | /* restore blocking io */ | |
1009 | if (!isatty(fileno(stdin))) | |
1010 | unset_nonblock(fileno(stdin)); | |
1011 | if (!isatty(fileno(stdout))) | |
1012 | unset_nonblock(fileno(stdout)); | |
1013 | if (!isatty(fileno(stderr))) | |
1014 | unset_nonblock(fileno(stderr)); | |
1015 | ||
c9130033 | 1016 | if (received_signal) { |
1017 | if (in_non_blocking_mode) /* XXX */ | |
1018 | leave_non_blocking(); | |
010f9726 | 1019 | fatal("Killed by signal %d.", (int) received_signal); |
c9130033 | 1020 | } |
1021 | ||
1022 | /* | |
1023 | * In interactive mode (with pseudo tty) display a message indicating | |
1024 | * that the connection has been closed. | |
1025 | */ | |
1026 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { | |
1027 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
1028 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1029 | } | |
1030 | ||
5260325f | 1031 | /* Output any buffered data for stdout. */ |
89aa792b | 1032 | while (buffer_len(&stdout_buffer) > 0) { |
1033 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1034 | buffer_len(&stdout_buffer)); |
89aa792b | 1035 | if (len <= 0) { |
5260325f | 1036 | error("Write failed flushing stdout buffer."); |
89aa792b | 1037 | break; |
1038 | } | |
5260325f | 1039 | buffer_consume(&stdout_buffer, len); |
cd332296 | 1040 | stdout_bytes += len; |
8efc0c15 | 1041 | } |
5260325f | 1042 | |
1043 | /* Output any buffered data for stderr. */ | |
89aa792b | 1044 | while (buffer_len(&stderr_buffer) > 0) { |
1045 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1046 | buffer_len(&stderr_buffer)); |
89aa792b | 1047 | if (len <= 0) { |
5260325f | 1048 | error("Write failed flushing stderr buffer."); |
89aa792b | 1049 | break; |
1050 | } | |
5260325f | 1051 | buffer_consume(&stderr_buffer, len); |
cd332296 | 1052 | stderr_bytes += len; |
5260325f | 1053 | } |
1054 | ||
5260325f | 1055 | /* Clear and free any buffers. */ |
1056 | memset(buf, 0, sizeof(buf)); | |
1057 | buffer_free(&stdin_buffer); | |
1058 | buffer_free(&stdout_buffer); | |
1059 | buffer_free(&stderr_buffer); | |
1060 | ||
1061 | /* Report bytes transferred, and transfer rates. */ | |
1062 | total_time = get_current_time() - start_time; | |
1063 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
184eed6a | 1064 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); |
5260325f | 1065 | if (total_time > 0) |
1066 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
184eed6a | 1067 | stdin_bytes / total_time, stdout_bytes / total_time, |
1068 | stderr_bytes / total_time); | |
5260325f | 1069 | |
1070 | /* Return the exit status of the program. */ | |
1071 | debug("Exit status %d", exit_status); | |
1072 | return exit_status; | |
8efc0c15 | 1073 | } |
7368a6c8 | 1074 | |
1075 | /*********/ | |
1076 | ||
396c147e | 1077 | static void |
7819b5c3 | 1078 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1079 | { |
1e3b8b07 | 1080 | u_int data_len; |
7368a6c8 | 1081 | char *data = packet_get_string(&data_len); |
95500969 | 1082 | packet_check_eom(); |
7368a6c8 | 1083 | buffer_append(&stdout_buffer, data, data_len); |
7368a6c8 | 1084 | memset(data, 0, data_len); |
1085 | xfree(data); | |
1086 | } | |
396c147e | 1087 | static void |
7819b5c3 | 1088 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1089 | { |
1e3b8b07 | 1090 | u_int data_len; |
7368a6c8 | 1091 | char *data = packet_get_string(&data_len); |
95500969 | 1092 | packet_check_eom(); |
7368a6c8 | 1093 | buffer_append(&stderr_buffer, data, data_len); |
7368a6c8 | 1094 | memset(data, 0, data_len); |
1095 | xfree(data); | |
1096 | } | |
396c147e | 1097 | static void |
7819b5c3 | 1098 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1099 | { |
7368a6c8 | 1100 | exit_status = packet_get_int(); |
95500969 | 1101 | packet_check_eom(); |
7368a6c8 | 1102 | /* Acknowledge the exit. */ |
1103 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1104 | packet_send(); | |
1105 | /* | |
1106 | * Must wait for packet to be sent since we are | |
1107 | * exiting the loop. | |
1108 | */ | |
1109 | packet_write_wait(); | |
1110 | /* Flag that we want to exit. */ | |
1111 | quit_pending = 1; | |
1112 | } | |
1113 | ||
396c147e | 1114 | static Channel * |
fa08c86b | 1115 | client_request_forwarded_tcpip(const char *request_type, int rchan) |
1116 | { | |
1117 | Channel* c = NULL; | |
1118 | char *listen_address, *originator_address; | |
1119 | int listen_port, originator_port; | |
719fc62f | 1120 | int sock; |
fa08c86b | 1121 | |
1122 | /* Get rest of the packet */ | |
1123 | listen_address = packet_get_string(NULL); | |
1124 | listen_port = packet_get_int(); | |
1125 | originator_address = packet_get_string(NULL); | |
1126 | originator_port = packet_get_int(); | |
95500969 | 1127 | packet_check_eom(); |
fa08c86b | 1128 | |
1129 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", | |
1130 | listen_address, listen_port, originator_address, originator_port); | |
1131 | ||
b3f8a79c | 1132 | sock = channel_connect_by_listen_address(listen_port); |
719fc62f | 1133 | if (sock < 0) { |
1134 | xfree(originator_address); | |
1135 | xfree(listen_address); | |
1136 | return NULL; | |
1137 | } | |
1138 | c = channel_new("forwarded-tcpip", | |
1139 | SSH_CHANNEL_CONNECTING, sock, sock, -1, | |
1140 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
1141 | xstrdup(originator_address), 1); | |
fa08c86b | 1142 | xfree(originator_address); |
1143 | xfree(listen_address); | |
1144 | return c; | |
1145 | } | |
1146 | ||
396c147e | 1147 | static Channel* |
fa08c86b | 1148 | client_request_x11(const char *request_type, int rchan) |
1149 | { | |
1150 | Channel *c = NULL; | |
1151 | char *originator; | |
1152 | int originator_port; | |
719fc62f | 1153 | int sock; |
fa08c86b | 1154 | |
1155 | if (!options.forward_x11) { | |
1156 | error("Warning: ssh server tried X11 forwarding."); | |
1157 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1158 | return NULL; | |
1159 | } | |
1160 | originator = packet_get_string(NULL); | |
1161 | if (datafellows & SSH_BUG_X11FWD) { | |
1162 | debug2("buggy server: x11 request w/o originator_port"); | |
1163 | originator_port = 0; | |
1164 | } else { | |
1165 | originator_port = packet_get_int(); | |
1166 | } | |
95500969 | 1167 | packet_check_eom(); |
fa08c86b | 1168 | /* XXX check permission */ |
865ac82e | 1169 | debug("client_request_x11: request from %s %d", originator, |
1170 | originator_port); | |
719fc62f | 1171 | xfree(originator); |
fa08c86b | 1172 | sock = x11_connect_display(); |
719fc62f | 1173 | if (sock < 0) |
1174 | return NULL; | |
1175 | c = channel_new("x11", | |
1176 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
1177 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, | |
1178 | xstrdup("x11"), 1); | |
a5f82435 | 1179 | c->force_drain = 1; |
fa08c86b | 1180 | return c; |
1181 | } | |
1182 | ||
396c147e | 1183 | static Channel* |
fa08c86b | 1184 | client_request_agent(const char *request_type, int rchan) |
1185 | { | |
1186 | Channel *c = NULL; | |
719fc62f | 1187 | int sock; |
fa08c86b | 1188 | |
1189 | if (!options.forward_agent) { | |
1190 | error("Warning: ssh server tried agent forwarding."); | |
1191 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1192 | return NULL; | |
1193 | } | |
1194 | sock = ssh_get_authentication_socket(); | |
719fc62f | 1195 | if (sock < 0) |
1196 | return NULL; | |
1197 | c = channel_new("authentication agent connection", | |
1198 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1199 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
1200 | xstrdup("authentication agent connection"), 1); | |
a5f82435 | 1201 | c->force_drain = 1; |
fa08c86b | 1202 | return c; |
1203 | } | |
1204 | ||
0b242b12 | 1205 | /* XXXX move to generic input handler */ |
396c147e | 1206 | static void |
7819b5c3 | 1207 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 1208 | { |
1209 | Channel *c = NULL; | |
1210 | char *ctype; | |
1e3b8b07 | 1211 | u_int len; |
0b242b12 | 1212 | int rchan; |
1213 | int rmaxpack; | |
1214 | int rwindow; | |
1215 | ||
1216 | ctype = packet_get_string(&len); | |
1217 | rchan = packet_get_int(); | |
1218 | rwindow = packet_get_int(); | |
1219 | rmaxpack = packet_get_int(); | |
1220 | ||
1d1ffb87 | 1221 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
0b242b12 | 1222 | ctype, rchan, rwindow, rmaxpack); |
1223 | ||
fa08c86b | 1224 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
1225 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1226 | } else if (strcmp(ctype, "x11") == 0) { | |
1227 | c = client_request_x11(ctype, rchan); | |
1228 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1229 | c = client_request_agent(ctype, rchan); | |
0b242b12 | 1230 | } |
1231 | /* XXX duplicate : */ | |
1232 | if (c != NULL) { | |
1233 | debug("confirm %s", ctype); | |
1234 | c->remote_id = rchan; | |
1235 | c->remote_window = rwindow; | |
1236 | c->remote_maxpacket = rmaxpack; | |
a01a10dd | 1237 | if (c->type != SSH_CHANNEL_CONNECTING) { |
1238 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1239 | packet_put_int(c->remote_id); | |
1240 | packet_put_int(c->self); | |
1241 | packet_put_int(c->local_window); | |
1242 | packet_put_int(c->local_maxpacket); | |
1243 | packet_send(); | |
1244 | } | |
0b242b12 | 1245 | } else { |
1246 | debug("failure %s", ctype); | |
1247 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1248 | packet_put_int(rchan); | |
1249 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
fbe90f7b | 1250 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
a01a10dd | 1251 | packet_put_cstring("open failed"); |
fbe90f7b | 1252 | packet_put_cstring(""); |
1253 | } | |
0b242b12 | 1254 | packet_send(); |
1255 | } | |
1256 | xfree(ctype); | |
1257 | } | |
396c147e | 1258 | static void |
7819b5c3 | 1259 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
1fc8ccdf | 1260 | { |
1261 | Channel *c = NULL; | |
1262 | int id, reply, success = 0; | |
1263 | char *rtype; | |
1264 | ||
1265 | id = packet_get_int(); | |
1266 | rtype = packet_get_string(NULL); | |
1267 | reply = packet_get_char(); | |
1268 | ||
1269 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1270 | id, rtype, reply); | |
1271 | ||
1272 | if (session_ident == -1) { | |
1273 | error("client_input_channel_req: no channel %d", session_ident); | |
1274 | } else if (id != session_ident) { | |
1275 | error("client_input_channel_req: channel %d: wrong channel: %d", | |
1276 | session_ident, id); | |
1277 | } | |
1278 | c = channel_lookup(id); | |
1279 | if (c == NULL) { | |
1280 | error("client_input_channel_req: channel %d: unknown channel", id); | |
1281 | } else if (strcmp(rtype, "exit-status") == 0) { | |
1282 | success = 1; | |
1283 | exit_status = packet_get_int(); | |
95500969 | 1284 | packet_check_eom(); |
1fc8ccdf | 1285 | } |
1286 | if (reply) { | |
1287 | packet_start(success ? | |
1288 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1289 | packet_put_int(c->remote_id); | |
1290 | packet_send(); | |
1291 | } | |
1292 | xfree(rtype); | |
1293 | } | |
3d209bbe | 1294 | static void |
1295 | client_input_global_request(int type, u_int32_t seq, void *ctxt) | |
1296 | { | |
1297 | char *rtype; | |
1298 | int want_reply; | |
1299 | int success = 0; | |
1300 | ||
1301 | rtype = packet_get_string(NULL); | |
1302 | want_reply = packet_get_char(); | |
1303 | debug("client_input_global_request: rtype %s want_reply %d", rtype, want_reply); | |
1304 | if (want_reply) { | |
1305 | packet_start(success ? | |
1306 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1307 | packet_send(); | |
1308 | packet_write_wait(); | |
1309 | } | |
1310 | xfree(rtype); | |
1311 | } | |
0b242b12 | 1312 | |
396c147e | 1313 | static void |
5ca51e19 | 1314 | client_init_dispatch_20(void) |
8ce64345 | 1315 | { |
7a37c112 | 1316 | dispatch_init(&dispatch_protocol_error); |
e0ae8728 | 1317 | |
8ce64345 | 1318 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
1319 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1320 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1321 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
0b242b12 | 1322 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
8ce64345 | 1323 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1324 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1fc8ccdf | 1325 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
8ce64345 | 1326 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
3d209bbe | 1327 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
7a37c112 | 1328 | |
1329 | /* rekeying */ | |
1330 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
e0ae8728 | 1331 | |
1332 | /* global request reply messages */ | |
1333 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); | |
1334 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); | |
8ce64345 | 1335 | } |
396c147e | 1336 | static void |
5ca51e19 | 1337 | client_init_dispatch_13(void) |
7368a6c8 | 1338 | { |
1339 | dispatch_init(NULL); | |
1340 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1341 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1342 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
7368a6c8 | 1343 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1344 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1345 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
7368a6c8 | 1346 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
1347 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1348 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
a22aff1f | 1349 | |
1350 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
1351 | &auth_input_open_request : &deny_input_open); | |
1352 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? | |
1353 | &x11_input_open : &deny_input_open); | |
7368a6c8 | 1354 | } |
396c147e | 1355 | static void |
5ca51e19 | 1356 | client_init_dispatch_15(void) |
7368a6c8 | 1357 | { |
1358 | client_init_dispatch_13(); | |
1359 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1360 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1361 | } | |
eea46d13 | 1362 | static void |
5ca51e19 | 1363 | client_init_dispatch(void) |
7368a6c8 | 1364 | { |
8ce64345 | 1365 | if (compat20) |
1366 | client_init_dispatch_20(); | |
1367 | else if (compat13) | |
7368a6c8 | 1368 | client_init_dispatch_13(); |
1369 | else | |
1370 | client_init_dispatch_15(); | |
1371 | } |