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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" | |
5d8d32a3 | 62 | RCSID("$OpenBSD: clientloop.c,v 1.117 2003/12/16 15:49:51 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 | ||
66357af5 | 92 | /* Flag indicating that no shell has been requested */ |
93 | extern int no_shell_flag; | |
94 | ||
aa3378df | 95 | /* |
96 | * Name of the host we are connecting to. This is the name given on the | |
97 | * command line, or the HostName specified for the user-supplied name in a | |
98 | * configuration file. | |
99 | */ | |
8efc0c15 | 100 | extern char *host; |
101 | ||
aa3378df | 102 | /* |
103 | * Flag to indicate that we have received a window change signal which has | |
104 | * not yet been processed. This will cause a message indicating the new | |
105 | * window size to be sent to the server a little later. This is volatile | |
106 | * because this is updated in a signal handler. | |
107 | */ | |
7a934d1b | 108 | static volatile sig_atomic_t received_window_change_signal = 0; |
109 | static volatile sig_atomic_t received_signal = 0; | |
8efc0c15 | 110 | |
8efc0c15 | 111 | /* Flag indicating whether the user\'s terminal is in non-blocking mode. */ |
112 | static int in_non_blocking_mode = 0; | |
113 | ||
114 | /* Common data for the client loop code. */ | |
2e73a022 | 115 | static int quit_pending; /* Set to non-zero to quit the client loop. */ |
116 | static int escape_char; /* Escape character. */ | |
5260325f | 117 | static int escape_pending; /* Last character was the escape character */ |
118 | static int last_was_cr; /* Last character was a newline. */ | |
119 | static int exit_status; /* Used to store the exit status of the command. */ | |
120 | static int stdin_eof; /* EOF has been encountered on standard error. */ | |
121 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
122 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
123 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
1e3b8b07 | 124 | static u_long stdin_bytes, stdout_bytes, stderr_bytes; |
125 | static u_int buffer_high;/* Soft max buffer size. */ | |
5260325f | 126 | static int connection_in; /* Connection to server (input). */ |
127 | static int connection_out; /* Connection to server (output). */ | |
c422989b | 128 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ |
eb0dd41f | 129 | static int session_closed = 0; /* In SSH2: login session closed. */ |
5d8d32a3 | 130 | static int server_alive_timeouts = 0; |
8efc0c15 | 131 | |
396c147e | 132 | static void client_init_dispatch(void); |
8ce64345 | 133 | int session_ident = -1; |
134 | ||
e092ce67 | 135 | /*XXX*/ |
136 | extern Kex *xxx_kex; | |
137 | ||
8efc0c15 | 138 | /* Restores stdin to blocking mode. */ |
139 | ||
396c147e | 140 | static void |
5ca51e19 | 141 | leave_non_blocking(void) |
8efc0c15 | 142 | { |
5260325f | 143 | if (in_non_blocking_mode) { |
144 | (void) fcntl(fileno(stdin), F_SETFL, 0); | |
145 | in_non_blocking_mode = 0; | |
5260325f | 146 | } |
8efc0c15 | 147 | } |
148 | ||
5260325f | 149 | /* Puts stdin terminal in non-blocking mode. */ |
150 | ||
396c147e | 151 | static void |
5ca51e19 | 152 | enter_non_blocking(void) |
8efc0c15 | 153 | { |
5260325f | 154 | in_non_blocking_mode = 1; |
155 | (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK); | |
8efc0c15 | 156 | } |
157 | ||
aa3378df | 158 | /* |
159 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
160 | * flag indicating that the window has changed. | |
161 | */ | |
8efc0c15 | 162 | |
396c147e | 163 | static void |
5260325f | 164 | window_change_handler(int sig) |
8efc0c15 | 165 | { |
5260325f | 166 | received_window_change_signal = 1; |
167 | signal(SIGWINCH, window_change_handler); | |
8efc0c15 | 168 | } |
169 | ||
aa3378df | 170 | /* |
171 | * Signal handler for signals that cause the program to terminate. These | |
172 | * signals must be trapped to restore terminal modes. | |
173 | */ | |
8efc0c15 | 174 | |
396c147e | 175 | static void |
5260325f | 176 | signal_handler(int sig) |
8efc0c15 | 177 | { |
c9130033 | 178 | received_signal = sig; |
179 | quit_pending = 1; | |
8efc0c15 | 180 | } |
181 | ||
aa3378df | 182 | /* |
183 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
184 | * available resolution. | |
185 | */ | |
8efc0c15 | 186 | |
396c147e | 187 | static double |
5ca51e19 | 188 | get_current_time(void) |
8efc0c15 | 189 | { |
5260325f | 190 | struct timeval tv; |
191 | gettimeofday(&tv, NULL); | |
192 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
8efc0c15 | 193 | } |
194 | ||
aa3378df | 195 | /* |
196 | * This is called when the interactive is entered. This checks if there is | |
197 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
198 | * not appear to wake up when redirecting from /dev/null. | |
199 | */ | |
8efc0c15 | 200 | |
396c147e | 201 | static void |
5ca51e19 | 202 | client_check_initial_eof_on_stdin(void) |
8efc0c15 | 203 | { |
5260325f | 204 | int len; |
205 | char buf[1]; | |
206 | ||
aa3378df | 207 | /* |
208 | * If standard input is to be "redirected from /dev/null", we simply | |
209 | * mark that we have seen an EOF and send an EOF message to the | |
210 | * server. Otherwise, we try to read a single character; it appears | |
211 | * that for some files, such /dev/null, select() never wakes up for | |
212 | * read for this descriptor, which means that we never get EOF. This | |
213 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
214 | */ | |
5260325f | 215 | if (stdin_null_flag) { |
216 | /* Fake EOF on stdin. */ | |
217 | debug("Sending eof."); | |
218 | stdin_eof = 1; | |
219 | packet_start(SSH_CMSG_EOF); | |
220 | packet_send(); | |
221 | } else { | |
5260325f | 222 | enter_non_blocking(); |
223 | ||
224 | /* Check for immediate EOF on stdin. */ | |
225 | len = read(fileno(stdin), buf, 1); | |
226 | if (len == 0) { | |
aa3378df | 227 | /* EOF. Record that we have seen it and send EOF to server. */ |
5260325f | 228 | debug("Sending eof."); |
229 | stdin_eof = 1; | |
230 | packet_start(SSH_CMSG_EOF); | |
231 | packet_send(); | |
232 | } else if (len > 0) { | |
aa3378df | 233 | /* |
234 | * Got data. We must store the data in the buffer, | |
235 | * and also process it as an escape character if | |
236 | * appropriate. | |
237 | */ | |
1e3b8b07 | 238 | if ((u_char) buf[0] == escape_char) |
5260325f | 239 | escape_pending = 1; |
7e8911cd | 240 | else |
5260325f | 241 | buffer_append(&stdin_buffer, buf, 1); |
5260325f | 242 | } |
5260325f | 243 | leave_non_blocking(); |
8efc0c15 | 244 | } |
8efc0c15 | 245 | } |
246 | ||
8efc0c15 | 247 | |
aa3378df | 248 | /* |
249 | * Make packets from buffered stdin data, and buffer them for sending to the | |
250 | * connection. | |
251 | */ | |
8efc0c15 | 252 | |
396c147e | 253 | static void |
5ca51e19 | 254 | client_make_packets_from_stdin_data(void) |
8efc0c15 | 255 | { |
1e3b8b07 | 256 | u_int len; |
5260325f | 257 | |
258 | /* Send buffered stdin data to the server. */ | |
259 | while (buffer_len(&stdin_buffer) > 0 && | |
184eed6a | 260 | packet_not_very_much_data_to_write()) { |
5260325f | 261 | len = buffer_len(&stdin_buffer); |
262 | /* Keep the packets at reasonable size. */ | |
263 | if (len > packet_get_maxsize()) | |
264 | len = packet_get_maxsize(); | |
265 | packet_start(SSH_CMSG_STDIN_DATA); | |
266 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
267 | packet_send(); | |
268 | buffer_consume(&stdin_buffer, len); | |
7e8911cd | 269 | stdin_bytes += len; |
5260325f | 270 | /* If we have a pending EOF, send it now. */ |
271 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
272 | packet_start(SSH_CMSG_EOF); | |
273 | packet_send(); | |
274 | } | |
8efc0c15 | 275 | } |
8efc0c15 | 276 | } |
277 | ||
aa3378df | 278 | /* |
279 | * Checks if the client window has changed, and sends a packet about it to | |
280 | * the server if so. The actual change is detected elsewhere (by a software | |
281 | * interrupt on Unix); this just checks the flag and sends a message if | |
282 | * appropriate. | |
283 | */ | |
8efc0c15 | 284 | |
396c147e | 285 | static void |
5ca51e19 | 286 | client_check_window_change(void) |
8efc0c15 | 287 | { |
8ce64345 | 288 | struct winsize ws; |
289 | ||
290 | if (! received_window_change_signal) | |
291 | return; | |
292 | /** XXX race */ | |
293 | received_window_change_signal = 0; | |
294 | ||
295 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
296 | return; | |
297 | ||
de273eef | 298 | debug2("client_check_window_change: changed"); |
8ce64345 | 299 | |
300 | if (compat20) { | |
301 | channel_request_start(session_ident, "window-change", 0); | |
302 | packet_put_int(ws.ws_col); | |
303 | packet_put_int(ws.ws_row); | |
304 | packet_put_int(ws.ws_xpixel); | |
305 | packet_put_int(ws.ws_ypixel); | |
306 | packet_send(); | |
307 | } else { | |
308 | packet_start(SSH_CMSG_WINDOW_SIZE); | |
309 | packet_put_int(ws.ws_row); | |
310 | packet_put_int(ws.ws_col); | |
311 | packet_put_int(ws.ws_xpixel); | |
312 | packet_put_int(ws.ws_ypixel); | |
313 | packet_send(); | |
8efc0c15 | 314 | } |
8efc0c15 | 315 | } |
316 | ||
5d8d32a3 | 317 | static void |
318 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
319 | { | |
320 | server_alive_timeouts = 0; | |
321 | client_global_request_reply_fwd(type, seq, ctxt); | |
322 | } | |
323 | ||
324 | static void | |
325 | server_alive_check(void) | |
326 | { | |
327 | if (++server_alive_timeouts > options.server_alive_count_max) | |
328 | packet_disconnect("Timeout, server not responding."); | |
329 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
330 | packet_put_cstring("keepalive@openssh.com"); | |
331 | packet_put_char(1); /* boolean: want reply */ | |
332 | packet_send(); | |
333 | } | |
334 | ||
aa3378df | 335 | /* |
336 | * Waits until the client can do something (some data becomes available on | |
337 | * one of the file descriptors). | |
338 | */ | |
8efc0c15 | 339 | |
396c147e | 340 | static void |
39929cdb | 341 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
489aa2e9 | 342 | int *maxfdp, int *nallocp, int rekeying) |
8efc0c15 | 343 | { |
5d8d32a3 | 344 | struct timeval tv, *tvp; |
345 | int ret; | |
346 | ||
39929cdb | 347 | /* Add any selections by the channel mechanism. */ |
489aa2e9 | 348 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); |
5260325f | 349 | |
8ce64345 | 350 | if (!compat20) { |
351 | /* Read from the connection, unless our buffers are full. */ | |
352 | if (buffer_len(&stdout_buffer) < buffer_high && | |
353 | buffer_len(&stderr_buffer) < buffer_high && | |
354 | channel_not_very_much_buffered_data()) | |
39929cdb | 355 | FD_SET(connection_in, *readsetp); |
8ce64345 | 356 | /* |
357 | * Read from stdin, unless we have seen EOF or have very much | |
358 | * buffered data to send to the server. | |
359 | */ | |
360 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
39929cdb | 361 | FD_SET(fileno(stdin), *readsetp); |
8ce64345 | 362 | |
363 | /* Select stdout/stderr if have data in buffer. */ | |
364 | if (buffer_len(&stdout_buffer) > 0) | |
39929cdb | 365 | FD_SET(fileno(stdout), *writesetp); |
8ce64345 | 366 | if (buffer_len(&stderr_buffer) > 0) |
39929cdb | 367 | FD_SET(fileno(stderr), *writesetp); |
8ce64345 | 368 | } else { |
24b6b45f | 369 | /* channel_prepare_select could have closed the last channel */ |
fd6cfbaf | 370 | if (session_closed && !channel_still_open() && |
371 | !packet_have_data_to_write()) { | |
372 | /* clear mask since we did not call select() */ | |
b3ad8fe6 | 373 | memset(*readsetp, 0, *nallocp); |
374 | memset(*writesetp, 0, *nallocp); | |
fd6cfbaf | 375 | return; |
24b6b45f | 376 | } else { |
377 | FD_SET(connection_in, *readsetp); | |
378 | } | |
8ce64345 | 379 | } |
5260325f | 380 | |
5260325f | 381 | /* Select server connection if have data to write to the server. */ |
382 | if (packet_have_data_to_write()) | |
39929cdb | 383 | FD_SET(connection_out, *writesetp); |
5260325f | 384 | |
aa3378df | 385 | /* |
386 | * Wait for something to happen. This will suspend the process until | |
387 | * some selected descriptor can be read, written, or has some other | |
5d8d32a3 | 388 | * event pending. |
aa3378df | 389 | */ |
5260325f | 390 | |
5d8d32a3 | 391 | if (options.server_alive_interval == 0 || !compat20) |
392 | tvp = NULL; | |
393 | else { | |
394 | tv.tv_sec = options.server_alive_interval; | |
395 | tv.tv_usec = 0; | |
396 | tvp = &tv; | |
397 | } | |
398 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); | |
399 | if (ret < 0) { | |
5260325f | 400 | char buf[100]; |
fd193ca4 | 401 | |
402 | /* | |
403 | * We have to clear the select masks, because we return. | |
404 | * We have to return, because the mainloop checks for the flags | |
405 | * set by the signal handlers. | |
406 | */ | |
b3ad8fe6 | 407 | memset(*readsetp, 0, *nallocp); |
408 | memset(*writesetp, 0, *nallocp); | |
fd193ca4 | 409 | |
5260325f | 410 | if (errno == EINTR) |
411 | return; | |
412 | /* Note: we might still have data in the buffers. */ | |
413 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
414 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 415 | quit_pending = 1; |
5d8d32a3 | 416 | } else if (ret == 0) |
417 | server_alive_check(); | |
8efc0c15 | 418 | } |
419 | ||
396c147e | 420 | static void |
2e73a022 | 421 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
8efc0c15 | 422 | { |
5260325f | 423 | struct winsize oldws, newws; |
424 | ||
425 | /* Flush stdout and stderr buffers. */ | |
2e73a022 | 426 | if (buffer_len(bout) > 0) |
dc54438a | 427 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); |
2e73a022 | 428 | if (buffer_len(berr) > 0) |
dc54438a | 429 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); |
5260325f | 430 | |
5260325f | 431 | leave_raw_mode(); |
432 | ||
aa3378df | 433 | /* |
434 | * Free (and clear) the buffer to reduce the amount of data that gets | |
435 | * written to swap. | |
436 | */ | |
2e73a022 | 437 | buffer_free(bin); |
438 | buffer_free(bout); | |
439 | buffer_free(berr); | |
5260325f | 440 | |
441 | /* Save old window size. */ | |
442 | ioctl(fileno(stdin), TIOCGWINSZ, &oldws); | |
443 | ||
444 | /* Send the suspend signal to the program itself. */ | |
445 | kill(getpid(), SIGTSTP); | |
446 | ||
447 | /* Check if the window size has changed. */ | |
448 | if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 && | |
449 | (oldws.ws_row != newws.ws_row || | |
184eed6a | 450 | oldws.ws_col != newws.ws_col || |
451 | oldws.ws_xpixel != newws.ws_xpixel || | |
452 | oldws.ws_ypixel != newws.ws_ypixel)) | |
5260325f | 453 | received_window_change_signal = 1; |
454 | ||
455 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
2e73a022 | 456 | buffer_init(bin); |
457 | buffer_init(bout); | |
458 | buffer_init(berr); | |
5260325f | 459 | |
5260325f | 460 | enter_raw_mode(); |
8efc0c15 | 461 | } |
462 | ||
396c147e | 463 | static void |
8ce64345 | 464 | client_process_net_input(fd_set * readset) |
8efc0c15 | 465 | { |
8ce64345 | 466 | int len; |
467 | char buf[8192]; | |
5260325f | 468 | |
aa3378df | 469 | /* |
470 | * Read input from the server, and add any such data to the buffer of | |
471 | * the packet subsystem. | |
472 | */ | |
5260325f | 473 | if (FD_ISSET(connection_in, readset)) { |
474 | /* Read as much as possible. */ | |
475 | len = read(connection_in, buf, sizeof(buf)); | |
476 | if (len == 0) { | |
477 | /* Received EOF. The remote host has closed the connection. */ | |
478 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
479 | host); | |
8efc0c15 | 480 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
8efc0c15 | 481 | quit_pending = 1; |
482 | return; | |
5260325f | 483 | } |
aa3378df | 484 | /* |
485 | * There is a kernel bug on Solaris that causes select to | |
486 | * sometimes wake up even though there is no data available. | |
487 | */ | |
09cb311c | 488 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
5260325f | 489 | len = 0; |
490 | ||
491 | if (len < 0) { | |
492 | /* An error has encountered. Perhaps there is a network problem. */ | |
493 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
494 | host, strerror(errno)); | |
495 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 496 | quit_pending = 1; |
497 | return; | |
498 | } | |
499 | packet_process_incoming(buf, len); | |
500 | } | |
8ce64345 | 501 | } |
502 | ||
c53c54c2 | 503 | static void |
ec9b7086 | 504 | process_cmdline(void) |
c53c54c2 | 505 | { |
c53c54c2 | 506 | void (*handler)(int); |
507 | char *s, *cmd; | |
508 | u_short fwd_port, fwd_host_port; | |
509 | char buf[1024], sfwd_port[6], sfwd_host_port[6]; | |
510 | int local = 0; | |
c53c54c2 | 511 | |
512 | leave_raw_mode(); | |
875ec275 | 513 | handler = signal(SIGINT, SIG_IGN); |
ec9b7086 | 514 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
c53c54c2 | 515 | if (s == NULL) |
516 | goto out; | |
c53c54c2 | 517 | while (*s && isspace(*s)) |
518 | s++; | |
c53c54c2 | 519 | if (*s == 0) |
520 | goto out; | |
c53c54c2 | 521 | if (strlen(s) < 2 || s[0] != '-' || !(s[1] == 'L' || s[1] == 'R')) { |
bbe88b6d | 522 | logit("Invalid command."); |
c53c54c2 | 523 | goto out; |
524 | } | |
525 | if (s[1] == 'L') | |
526 | local = 1; | |
527 | if (!local && !compat20) { | |
bbe88b6d | 528 | logit("Not supported for SSH protocol version 1."); |
c53c54c2 | 529 | goto out; |
530 | } | |
c53c54c2 | 531 | s += 2; |
532 | while (*s && isspace(*s)) | |
533 | s++; | |
534 | ||
535 | if (sscanf(s, "%5[0-9]:%255[^:]:%5[0-9]", | |
536 | sfwd_port, buf, sfwd_host_port) != 3 && | |
537 | sscanf(s, "%5[0-9]/%255[^/]/%5[0-9]", | |
538 | sfwd_port, buf, sfwd_host_port) != 3) { | |
bbe88b6d | 539 | logit("Bad forwarding specification."); |
c53c54c2 | 540 | goto out; |
541 | } | |
542 | if ((fwd_port = a2port(sfwd_port)) == 0 || | |
543 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { | |
bbe88b6d | 544 | logit("Bad forwarding port(s)."); |
c53c54c2 | 545 | goto out; |
546 | } | |
547 | if (local) { | |
ec9b7086 | 548 | if (channel_setup_local_fwd_listener(fwd_port, buf, |
549 | fwd_host_port, options.gateway_ports) < 0) { | |
bbe88b6d | 550 | logit("Port forwarding failed."); |
c53c54c2 | 551 | goto out; |
552 | } | |
553 | } else | |
554 | channel_request_remote_forwarding(fwd_port, buf, | |
555 | fwd_host_port); | |
bbe88b6d | 556 | logit("Forwarding port."); |
c53c54c2 | 557 | out: |
558 | signal(SIGINT, handler); | |
559 | enter_raw_mode(); | |
560 | if (cmd) | |
561 | xfree(cmd); | |
562 | } | |
563 | ||
2e73a022 | 564 | /* process the characters one by one */ |
396c147e | 565 | static int |
2e73a022 | 566 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) |
567 | { | |
568 | char string[1024]; | |
569 | pid_t pid; | |
570 | int bytes = 0; | |
1e3b8b07 | 571 | u_int i; |
572 | u_char ch; | |
2e73a022 | 573 | char *s; |
574 | ||
575 | for (i = 0; i < len; i++) { | |
576 | /* Get one character at a time. */ | |
577 | ch = buf[i]; | |
578 | ||
579 | if (escape_pending) { | |
580 | /* We have previously seen an escape character. */ | |
581 | /* Clear the flag now. */ | |
582 | escape_pending = 0; | |
583 | ||
584 | /* Process the escaped character. */ | |
585 | switch (ch) { | |
586 | case '.': | |
587 | /* Terminate the connection. */ | |
588 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
589 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 590 | |
591 | quit_pending = 1; | |
592 | return -1; | |
593 | ||
594 | case 'Z' - 64: | |
595 | /* Suspend the program. */ | |
596 | /* Print a message to that effect to the user. */ | |
597 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
598 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 599 | |
600 | /* Restore terminal modes and suspend. */ | |
601 | client_suspend_self(bin, bout, berr); | |
602 | ||
603 | /* We have been continued. */ | |
604 | continue; | |
605 | ||
16a79097 | 606 | case 'B': |
607 | if (compat20) { | |
608 | snprintf(string, sizeof string, | |
609 | "%cB\r\n", escape_char); | |
610 | buffer_append(berr, string, | |
611 | strlen(string)); | |
612 | channel_request_start(session_ident, | |
613 | "break", 0); | |
614 | packet_put_int(1000); | |
615 | packet_send(); | |
616 | } | |
617 | continue; | |
618 | ||
e092ce67 | 619 | case 'R': |
54506d2e | 620 | if (compat20) { |
621 | if (datafellows & SSH_BUG_NOREKEY) | |
bbe88b6d | 622 | logit("Server does not support re-keying"); |
54506d2e | 623 | else |
624 | need_rekeying = 1; | |
625 | } | |
e092ce67 | 626 | continue; |
627 | ||
2e73a022 | 628 | case '&': |
2e73a022 | 629 | /* |
630 | * Detach the program (continue to serve connections, | |
631 | * but put in background and no more new connections). | |
632 | */ | |
2e73a022 | 633 | /* Restore tty modes. */ |
634 | leave_raw_mode(); | |
635 | ||
636 | /* Stop listening for new connections. */ | |
c6940381 | 637 | channel_stop_listening(); |
2e73a022 | 638 | |
c6940381 | 639 | snprintf(string, sizeof string, |
640 | "%c& [backgrounded]\n", escape_char); | |
641 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 642 | |
643 | /* Fork into background. */ | |
644 | pid = fork(); | |
645 | if (pid < 0) { | |
646 | error("fork: %.100s", strerror(errno)); | |
647 | continue; | |
648 | } | |
649 | if (pid != 0) { /* This is the parent. */ | |
650 | /* The parent just exits. */ | |
651 | exit(0); | |
652 | } | |
653 | /* The child continues serving connections. */ | |
c6940381 | 654 | if (compat20) { |
655 | buffer_append(bin, "\004", 1); | |
656 | /* fake EOF on stdin */ | |
657 | return -1; | |
658 | } else if (!stdin_eof) { | |
659 | /* | |
660 | * Sending SSH_CMSG_EOF alone does not always appear | |
661 | * to be enough. So we try to send an EOF character | |
662 | * first. | |
663 | */ | |
664 | packet_start(SSH_CMSG_STDIN_DATA); | |
665 | packet_put_string("\004", 1); | |
666 | packet_send(); | |
667 | /* Close stdin. */ | |
668 | stdin_eof = 1; | |
669 | if (buffer_len(bin) == 0) { | |
670 | packet_start(SSH_CMSG_EOF); | |
671 | packet_send(); | |
672 | } | |
673 | } | |
674 | continue; | |
2e73a022 | 675 | |
676 | case '?': | |
677 | snprintf(string, sizeof string, | |
678 | "%c?\r\n\ | |
679 | Supported escape sequences:\r\n\ | |
1d77f8cb | 680 | %c. - terminate connection\r\n\ |
16a79097 | 681 | %cB - send a BREAK to the remote system\r\n\ |
1d77f8cb | 682 | %cC - open a command line\r\n\ |
683 | %cR - Request rekey (SSH protocol 2 only)\r\n\ | |
684 | %c^Z - suspend ssh\r\n\ | |
685 | %c# - list forwarded connections\r\n\ | |
686 | %c& - background ssh (when waiting for connections to terminate)\r\n\ | |
687 | %c? - this message\r\n\ | |
688 | %c%c - send the escape character by typing it twice\r\n\ | |
2e73a022 | 689 | (Note that escapes are only recognized immediately after newline.)\r\n", |
1d77f8cb | 690 | escape_char, escape_char, escape_char, escape_char, |
691 | escape_char, escape_char, escape_char, escape_char, | |
16a79097 | 692 | escape_char, escape_char, escape_char); |
2e73a022 | 693 | buffer_append(berr, string, strlen(string)); |
694 | continue; | |
695 | ||
696 | case '#': | |
697 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
698 | buffer_append(berr, string, strlen(string)); | |
699 | s = channel_open_message(); | |
700 | buffer_append(berr, s, strlen(s)); | |
701 | xfree(s); | |
702 | continue; | |
703 | ||
c53c54c2 | 704 | case 'C': |
ec9b7086 | 705 | process_cmdline(); |
c53c54c2 | 706 | continue; |
707 | ||
2e73a022 | 708 | default: |
709 | if (ch != escape_char) { | |
710 | buffer_put_char(bin, escape_char); | |
711 | bytes++; | |
712 | } | |
713 | /* Escaped characters fall through here */ | |
714 | break; | |
715 | } | |
716 | } else { | |
717 | /* | |
718 | * The previous character was not an escape char. Check if this | |
719 | * is an escape. | |
720 | */ | |
721 | if (last_was_cr && ch == escape_char) { | |
722 | /* It is. Set the flag and continue to next character. */ | |
723 | escape_pending = 1; | |
724 | continue; | |
725 | } | |
726 | } | |
727 | ||
728 | /* | |
729 | * Normal character. Record whether it was a newline, | |
730 | * and append it to the buffer. | |
731 | */ | |
732 | last_was_cr = (ch == '\r' || ch == '\n'); | |
733 | buffer_put_char(bin, ch); | |
734 | bytes++; | |
735 | } | |
736 | return bytes; | |
737 | } | |
738 | ||
396c147e | 739 | static void |
8ce64345 | 740 | client_process_input(fd_set * readset) |
741 | { | |
9da5c3c9 | 742 | int len; |
2e73a022 | 743 | char buf[8192]; |
8ce64345 | 744 | |
5260325f | 745 | /* Read input from stdin. */ |
746 | if (FD_ISSET(fileno(stdin), readset)) { | |
747 | /* Read as much as possible. */ | |
748 | len = read(fileno(stdin), buf, sizeof(buf)); | |
cf6bc93c | 749 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
750 | return; /* we'll try again later */ | |
5260325f | 751 | if (len <= 0) { |
aa3378df | 752 | /* |
753 | * Received EOF or error. They are treated | |
754 | * similarly, except that an error message is printed | |
755 | * if it was an error condition. | |
756 | */ | |
5260325f | 757 | if (len < 0) { |
758 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
759 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 760 | } |
761 | /* Mark that we have seen EOF. */ | |
762 | stdin_eof = 1; | |
aa3378df | 763 | /* |
764 | * Send an EOF message to the server unless there is | |
765 | * data in the buffer. If there is data in the | |
766 | * buffer, no message will be sent now. Code | |
767 | * elsewhere will send the EOF when the buffer | |
768 | * becomes empty if stdin_eof is set. | |
769 | */ | |
5260325f | 770 | if (buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 771 | packet_start(SSH_CMSG_EOF); |
772 | packet_send(); | |
5260325f | 773 | } |
4bf9c10e | 774 | } else if (escape_char == SSH_ESCAPECHAR_NONE) { |
aa3378df | 775 | /* |
776 | * Normal successful read, and no escape character. | |
777 | * Just append the data to buffer. | |
778 | */ | |
5260325f | 779 | buffer_append(&stdin_buffer, buf, len); |
5260325f | 780 | } else { |
aa3378df | 781 | /* |
782 | * Normal, successful read. But we have an escape character | |
783 | * and have to process the characters one by one. | |
784 | */ | |
7e8911cd | 785 | if (process_escapes(&stdin_buffer, &stdout_buffer, |
786 | &stderr_buffer, buf, len) == -1) | |
2e73a022 | 787 | return; |
5260325f | 788 | } |
789 | } | |
8efc0c15 | 790 | } |
791 | ||
396c147e | 792 | static void |
5260325f | 793 | client_process_output(fd_set * writeset) |
8efc0c15 | 794 | { |
5260325f | 795 | int len; |
796 | char buf[100]; | |
797 | ||
798 | /* Write buffered output to stdout. */ | |
799 | if (FD_ISSET(fileno(stdout), writeset)) { | |
800 | /* Write as much data as possible. */ | |
801 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 802 | buffer_len(&stdout_buffer)); |
5260325f | 803 | if (len <= 0) { |
cf6bc93c | 804 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 805 | len = 0; |
806 | else { | |
aa3378df | 807 | /* |
808 | * An error or EOF was encountered. Put an | |
809 | * error message to stderr buffer. | |
810 | */ | |
5260325f | 811 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
812 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 813 | quit_pending = 1; |
814 | return; | |
815 | } | |
816 | } | |
817 | /* Consume printed data from the buffer. */ | |
818 | buffer_consume(&stdout_buffer, len); | |
cd332296 | 819 | stdout_bytes += len; |
5260325f | 820 | } |
821 | /* Write buffered output to stderr. */ | |
822 | if (FD_ISSET(fileno(stderr), writeset)) { | |
823 | /* Write as much data as possible. */ | |
824 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 825 | buffer_len(&stderr_buffer)); |
5260325f | 826 | if (len <= 0) { |
cf6bc93c | 827 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 828 | len = 0; |
829 | else { | |
aa3378df | 830 | /* EOF or error, but can't even print error message. */ |
5260325f | 831 | quit_pending = 1; |
832 | return; | |
833 | } | |
834 | } | |
835 | /* Consume printed characters from the buffer. */ | |
836 | buffer_consume(&stderr_buffer, len); | |
cd332296 | 837 | stderr_bytes += len; |
8efc0c15 | 838 | } |
8efc0c15 | 839 | } |
840 | ||
7368a6c8 | 841 | /* |
842 | * Get packets from the connection input buffer, and process them as long as | |
843 | * there are packets available. | |
844 | * | |
845 | * Any unknown packets received during the actual | |
846 | * session cause the session to terminate. This is | |
847 | * intended to make debugging easier since no | |
848 | * confirmations are sent. Any compatible protocol | |
849 | * extensions must be negotiated during the | |
850 | * preparatory phase. | |
851 | */ | |
852 | ||
396c147e | 853 | static void |
5ca51e19 | 854 | client_process_buffered_input_packets(void) |
7368a6c8 | 855 | { |
e092ce67 | 856 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); |
7368a6c8 | 857 | } |
858 | ||
2e73a022 | 859 | /* scan buf[] for '~' before sending data to the peer */ |
860 | ||
396c147e | 861 | static int |
2e73a022 | 862 | simple_escape_filter(Channel *c, char *buf, int len) |
863 | { | |
864 | /* XXX we assume c->extended is writeable */ | |
865 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
866 | } | |
867 | ||
396c147e | 868 | static void |
eb0dd41f | 869 | client_channel_closed(int id, void *arg) |
870 | { | |
871 | if (id != session_ident) | |
872 | error("client_channel_closed: id %d != session_ident %d", | |
873 | id, session_ident); | |
418e724c | 874 | channel_cancel_cleanup(id); |
eb0dd41f | 875 | session_closed = 1; |
82de775c | 876 | leave_raw_mode(); |
eb0dd41f | 877 | } |
878 | ||
aa3378df | 879 | /* |
880 | * Implements the interactive session with the server. This is called after | |
881 | * the user has been authenticated, and a command has been started on the | |
4bf9c10e | 882 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character |
883 | * used as an escape character for terminating or suspending the session. | |
aa3378df | 884 | */ |
8efc0c15 | 885 | |
6ae2364d | 886 | int |
2e73a022 | 887 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
8efc0c15 | 888 | { |
39929cdb | 889 | fd_set *readset = NULL, *writeset = NULL; |
5260325f | 890 | double start_time, total_time; |
489aa2e9 | 891 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0, nalloc = 0; |
5260325f | 892 | char buf[100]; |
893 | ||
894 | debug("Entering interactive session."); | |
895 | ||
896 | start_time = get_current_time(); | |
897 | ||
898 | /* Initialize variables. */ | |
899 | escape_pending = 0; | |
900 | last_was_cr = 1; | |
901 | exit_status = -1; | |
902 | stdin_eof = 0; | |
903 | buffer_high = 64 * 1024; | |
904 | connection_in = packet_get_connection_in(); | |
905 | connection_out = packet_get_connection_out(); | |
39929cdb | 906 | max_fd = MAX(connection_in, connection_out); |
907 | ||
908 | if (!compat20) { | |
e968270c | 909 | /* enable nonblocking unless tty */ |
910 | if (!isatty(fileno(stdin))) | |
911 | set_nonblock(fileno(stdin)); | |
912 | if (!isatty(fileno(stdout))) | |
913 | set_nonblock(fileno(stdout)); | |
914 | if (!isatty(fileno(stderr))) | |
915 | set_nonblock(fileno(stderr)); | |
39929cdb | 916 | max_fd = MAX(max_fd, fileno(stdin)); |
917 | max_fd = MAX(max_fd, fileno(stdout)); | |
918 | max_fd = MAX(max_fd, fileno(stderr)); | |
919 | } | |
5260325f | 920 | stdin_bytes = 0; |
921 | stdout_bytes = 0; | |
922 | stderr_bytes = 0; | |
923 | quit_pending = 0; | |
924 | escape_char = escape_char_arg; | |
925 | ||
926 | /* Initialize buffers. */ | |
927 | buffer_init(&stdin_buffer); | |
928 | buffer_init(&stdout_buffer); | |
929 | buffer_init(&stderr_buffer); | |
930 | ||
7368a6c8 | 931 | client_init_dispatch(); |
932 | ||
3c93c917 | 933 | /* |
934 | * Set signal handlers, (e.g. to restore non-blocking mode) | |
935 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) | |
936 | */ | |
937 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) | |
938 | signal(SIGINT, signal_handler); | |
939 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) | |
940 | signal(SIGQUIT, signal_handler); | |
941 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) | |
942 | signal(SIGTERM, signal_handler); | |
5260325f | 943 | if (have_pty) |
944 | signal(SIGWINCH, window_change_handler); | |
945 | ||
5260325f | 946 | if (have_pty) |
947 | enter_raw_mode(); | |
948 | ||
1fc8ccdf | 949 | if (compat20) { |
950 | session_ident = ssh2_chan_id; | |
4bf9c10e | 951 | if (escape_char != SSH_ESCAPECHAR_NONE) |
1fc8ccdf | 952 | channel_register_filter(session_ident, |
953 | simple_escape_filter); | |
eb0dd41f | 954 | if (session_ident != -1) |
955 | channel_register_cleanup(session_ident, | |
956 | client_channel_closed); | |
1fc8ccdf | 957 | } else { |
958 | /* Check if we should immediately send eof on stdin. */ | |
8ce64345 | 959 | client_check_initial_eof_on_stdin(); |
1fc8ccdf | 960 | } |
2e73a022 | 961 | |
5260325f | 962 | /* Main loop of the client for the interactive session mode. */ |
963 | while (!quit_pending) { | |
5260325f | 964 | |
aa3378df | 965 | /* Process buffered packets sent by the server. */ |
5260325f | 966 | client_process_buffered_input_packets(); |
967 | ||
eb0dd41f | 968 | if (compat20 && session_closed && !channel_still_open()) |
8ce64345 | 969 | break; |
eb0dd41f | 970 | |
971 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
8ce64345 | 972 | |
c422989b | 973 | if (rekeying) { |
974 | debug("rekeying in progress"); | |
975 | } else { | |
976 | /* | |
977 | * Make packets of buffered stdin data, and buffer | |
978 | * them for sending to the server. | |
979 | */ | |
980 | if (!compat20) | |
981 | client_make_packets_from_stdin_data(); | |
5260325f | 982 | |
c422989b | 983 | /* |
984 | * Make packets from buffered channel data, and | |
985 | * enqueue them for sending to the server. | |
986 | */ | |
987 | if (packet_not_very_much_data_to_write()) | |
988 | channel_output_poll(); | |
5260325f | 989 | |
c422989b | 990 | /* |
991 | * Check if the window size has changed, and buffer a | |
992 | * message about it to the server if so. | |
993 | */ | |
994 | client_check_window_change(); | |
5260325f | 995 | |
c422989b | 996 | if (quit_pending) |
997 | break; | |
998 | } | |
aa3378df | 999 | /* |
1000 | * Wait until we have something to do (something becomes | |
1001 | * available on one of the descriptors). | |
1002 | */ | |
489aa2e9 | 1003 | max_fd2 = max_fd; |
c422989b | 1004 | client_wait_until_can_do_something(&readset, &writeset, |
489aa2e9 | 1005 | &max_fd2, &nalloc, rekeying); |
5260325f | 1006 | |
1007 | if (quit_pending) | |
1008 | break; | |
1009 | ||
c422989b | 1010 | /* Do channel operations unless rekeying in progress. */ |
1011 | if (!rekeying) { | |
1012 | channel_after_select(readset, writeset); | |
ffd7b36b | 1013 | if (need_rekeying || packet_need_rekeying()) { |
1014 | debug("need rekeying"); | |
c422989b | 1015 | xxx_kex->done = 0; |
1016 | kex_send_kexinit(xxx_kex); | |
1017 | need_rekeying = 0; | |
1018 | } | |
1019 | } | |
5260325f | 1020 | |
8ce64345 | 1021 | /* Buffer input from the connection. */ |
39929cdb | 1022 | client_process_net_input(readset); |
5260325f | 1023 | |
8ce64345 | 1024 | if (quit_pending) |
1025 | break; | |
1026 | ||
1027 | if (!compat20) { | |
1028 | /* Buffer data from stdin */ | |
39929cdb | 1029 | client_process_input(readset); |
8ce64345 | 1030 | /* |
1031 | * Process output to stdout and stderr. Output to | |
1032 | * the connection is processed elsewhere (above). | |
1033 | */ | |
39929cdb | 1034 | client_process_output(writeset); |
8ce64345 | 1035 | } |
5260325f | 1036 | |
aa3378df | 1037 | /* Send as much buffered packet data as possible to the sender. */ |
39929cdb | 1038 | if (FD_ISSET(connection_out, writeset)) |
5260325f | 1039 | packet_write_poll(); |
1040 | } | |
39929cdb | 1041 | if (readset) |
1042 | xfree(readset); | |
1043 | if (writeset) | |
1044 | xfree(writeset); | |
5260325f | 1045 | |
1046 | /* Terminate the session. */ | |
1047 | ||
1048 | /* Stop watching for window change. */ | |
1049 | if (have_pty) | |
1050 | signal(SIGWINCH, SIG_DFL); | |
1051 | ||
d6746a0b | 1052 | channel_free_all(); |
5260325f | 1053 | |
c9130033 | 1054 | if (have_pty) |
1055 | leave_raw_mode(); | |
89aa792b | 1056 | |
1057 | /* restore blocking io */ | |
1058 | if (!isatty(fileno(stdin))) | |
1059 | unset_nonblock(fileno(stdin)); | |
1060 | if (!isatty(fileno(stdout))) | |
1061 | unset_nonblock(fileno(stdout)); | |
1062 | if (!isatty(fileno(stderr))) | |
1063 | unset_nonblock(fileno(stderr)); | |
1064 | ||
66357af5 | 1065 | /* |
1066 | * If there was no shell or command requested, there will be no remote | |
1067 | * exit status to be returned. In that case, clear error code if the | |
1068 | * connection was deliberately terminated at this end. | |
1069 | */ | |
1070 | if (no_shell_flag && received_signal == SIGTERM) { | |
1071 | received_signal = 0; | |
1072 | exit_status = 0; | |
1073 | } | |
1074 | ||
82de775c | 1075 | if (received_signal) |
010f9726 | 1076 | fatal("Killed by signal %d.", (int) received_signal); |
c9130033 | 1077 | |
1078 | /* | |
1079 | * In interactive mode (with pseudo tty) display a message indicating | |
1080 | * that the connection has been closed. | |
1081 | */ | |
1082 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { | |
1083 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
1084 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1085 | } | |
1086 | ||
5260325f | 1087 | /* Output any buffered data for stdout. */ |
89aa792b | 1088 | while (buffer_len(&stdout_buffer) > 0) { |
1089 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1090 | buffer_len(&stdout_buffer)); |
89aa792b | 1091 | if (len <= 0) { |
5260325f | 1092 | error("Write failed flushing stdout buffer."); |
89aa792b | 1093 | break; |
1094 | } | |
5260325f | 1095 | buffer_consume(&stdout_buffer, len); |
cd332296 | 1096 | stdout_bytes += len; |
8efc0c15 | 1097 | } |
5260325f | 1098 | |
1099 | /* Output any buffered data for stderr. */ | |
89aa792b | 1100 | while (buffer_len(&stderr_buffer) > 0) { |
1101 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1102 | buffer_len(&stderr_buffer)); |
89aa792b | 1103 | if (len <= 0) { |
5260325f | 1104 | error("Write failed flushing stderr buffer."); |
89aa792b | 1105 | break; |
1106 | } | |
5260325f | 1107 | buffer_consume(&stderr_buffer, len); |
cd332296 | 1108 | stderr_bytes += len; |
5260325f | 1109 | } |
1110 | ||
5260325f | 1111 | /* Clear and free any buffers. */ |
1112 | memset(buf, 0, sizeof(buf)); | |
1113 | buffer_free(&stdin_buffer); | |
1114 | buffer_free(&stdout_buffer); | |
1115 | buffer_free(&stderr_buffer); | |
1116 | ||
1117 | /* Report bytes transferred, and transfer rates. */ | |
1118 | total_time = get_current_time() - start_time; | |
1119 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
184eed6a | 1120 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); |
5260325f | 1121 | if (total_time > 0) |
1122 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
184eed6a | 1123 | stdin_bytes / total_time, stdout_bytes / total_time, |
1124 | stderr_bytes / total_time); | |
5260325f | 1125 | |
1126 | /* Return the exit status of the program. */ | |
1127 | debug("Exit status %d", exit_status); | |
1128 | return exit_status; | |
8efc0c15 | 1129 | } |
7368a6c8 | 1130 | |
1131 | /*********/ | |
1132 | ||
396c147e | 1133 | static void |
7819b5c3 | 1134 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1135 | { |
1e3b8b07 | 1136 | u_int data_len; |
7368a6c8 | 1137 | char *data = packet_get_string(&data_len); |
95500969 | 1138 | packet_check_eom(); |
7368a6c8 | 1139 | buffer_append(&stdout_buffer, data, data_len); |
7368a6c8 | 1140 | memset(data, 0, data_len); |
1141 | xfree(data); | |
1142 | } | |
396c147e | 1143 | static void |
7819b5c3 | 1144 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1145 | { |
1e3b8b07 | 1146 | u_int data_len; |
7368a6c8 | 1147 | char *data = packet_get_string(&data_len); |
95500969 | 1148 | packet_check_eom(); |
7368a6c8 | 1149 | buffer_append(&stderr_buffer, data, data_len); |
7368a6c8 | 1150 | memset(data, 0, data_len); |
1151 | xfree(data); | |
1152 | } | |
396c147e | 1153 | static void |
7819b5c3 | 1154 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1155 | { |
7368a6c8 | 1156 | exit_status = packet_get_int(); |
95500969 | 1157 | packet_check_eom(); |
7368a6c8 | 1158 | /* Acknowledge the exit. */ |
1159 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1160 | packet_send(); | |
1161 | /* | |
1162 | * Must wait for packet to be sent since we are | |
1163 | * exiting the loop. | |
1164 | */ | |
1165 | packet_write_wait(); | |
1166 | /* Flag that we want to exit. */ | |
1167 | quit_pending = 1; | |
1168 | } | |
c15706e2 | 1169 | static void |
1170 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) | |
1171 | { | |
1172 | Channel *c = NULL; | |
1173 | int remote_id, sock; | |
1174 | ||
1175 | /* Read the remote channel number from the message. */ | |
1176 | remote_id = packet_get_int(); | |
1177 | packet_check_eom(); | |
1178 | ||
1179 | /* | |
1180 | * Get a connection to the local authentication agent (this may again | |
1181 | * get forwarded). | |
1182 | */ | |
1183 | sock = ssh_get_authentication_socket(); | |
1184 | ||
1185 | /* | |
1186 | * If we could not connect the agent, send an error message back to | |
1187 | * the server. This should never happen unless the agent dies, | |
1188 | * because authentication forwarding is only enabled if we have an | |
1189 | * agent. | |
1190 | */ | |
1191 | if (sock >= 0) { | |
1192 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, | |
1193 | -1, 0, 0, 0, "authentication agent connection", 1); | |
1194 | c->remote_id = remote_id; | |
1195 | c->force_drain = 1; | |
1196 | } | |
1197 | if (c == NULL) { | |
1198 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1199 | packet_put_int(remote_id); | |
1200 | } else { | |
1201 | /* Send a confirmation to the remote host. */ | |
1202 | debug("Forwarding authentication connection."); | |
1203 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1204 | packet_put_int(remote_id); | |
1205 | packet_put_int(c->self); | |
1206 | } | |
1207 | packet_send(); | |
1208 | } | |
7368a6c8 | 1209 | |
396c147e | 1210 | static Channel * |
fa08c86b | 1211 | client_request_forwarded_tcpip(const char *request_type, int rchan) |
1212 | { | |
343288b8 | 1213 | Channel *c = NULL; |
fa08c86b | 1214 | char *listen_address, *originator_address; |
1215 | int listen_port, originator_port; | |
719fc62f | 1216 | int sock; |
fa08c86b | 1217 | |
1218 | /* Get rest of the packet */ | |
1219 | listen_address = packet_get_string(NULL); | |
1220 | listen_port = packet_get_int(); | |
1221 | originator_address = packet_get_string(NULL); | |
1222 | originator_port = packet_get_int(); | |
95500969 | 1223 | packet_check_eom(); |
fa08c86b | 1224 | |
1225 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", | |
1226 | listen_address, listen_port, originator_address, originator_port); | |
1227 | ||
b3f8a79c | 1228 | sock = channel_connect_by_listen_address(listen_port); |
719fc62f | 1229 | if (sock < 0) { |
1230 | xfree(originator_address); | |
1231 | xfree(listen_address); | |
1232 | return NULL; | |
1233 | } | |
1234 | c = channel_new("forwarded-tcpip", | |
1235 | SSH_CHANNEL_CONNECTING, sock, sock, -1, | |
1236 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
0d942eff | 1237 | originator_address, 1); |
fa08c86b | 1238 | xfree(originator_address); |
1239 | xfree(listen_address); | |
1240 | return c; | |
1241 | } | |
1242 | ||
343288b8 | 1243 | static Channel * |
fa08c86b | 1244 | client_request_x11(const char *request_type, int rchan) |
1245 | { | |
1246 | Channel *c = NULL; | |
1247 | char *originator; | |
1248 | int originator_port; | |
719fc62f | 1249 | int sock; |
fa08c86b | 1250 | |
1251 | if (!options.forward_x11) { | |
1252 | error("Warning: ssh server tried X11 forwarding."); | |
1253 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1254 | return NULL; | |
1255 | } | |
1256 | originator = packet_get_string(NULL); | |
1257 | if (datafellows & SSH_BUG_X11FWD) { | |
1258 | debug2("buggy server: x11 request w/o originator_port"); | |
1259 | originator_port = 0; | |
1260 | } else { | |
1261 | originator_port = packet_get_int(); | |
1262 | } | |
95500969 | 1263 | packet_check_eom(); |
fa08c86b | 1264 | /* XXX check permission */ |
865ac82e | 1265 | debug("client_request_x11: request from %s %d", originator, |
1266 | originator_port); | |
719fc62f | 1267 | xfree(originator); |
fa08c86b | 1268 | sock = x11_connect_display(); |
719fc62f | 1269 | if (sock < 0) |
1270 | return NULL; | |
1271 | c = channel_new("x11", | |
1272 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
0d942eff | 1273 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
a5f82435 | 1274 | c->force_drain = 1; |
fa08c86b | 1275 | return c; |
1276 | } | |
1277 | ||
343288b8 | 1278 | static Channel * |
fa08c86b | 1279 | client_request_agent(const char *request_type, int rchan) |
1280 | { | |
1281 | Channel *c = NULL; | |
719fc62f | 1282 | int sock; |
fa08c86b | 1283 | |
1284 | if (!options.forward_agent) { | |
1285 | error("Warning: ssh server tried agent forwarding."); | |
1286 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1287 | return NULL; | |
1288 | } | |
1289 | sock = ssh_get_authentication_socket(); | |
719fc62f | 1290 | if (sock < 0) |
1291 | return NULL; | |
1292 | c = channel_new("authentication agent connection", | |
1293 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1294 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
0d942eff | 1295 | "authentication agent connection", 1); |
a5f82435 | 1296 | c->force_drain = 1; |
fa08c86b | 1297 | return c; |
1298 | } | |
1299 | ||
0b242b12 | 1300 | /* XXXX move to generic input handler */ |
396c147e | 1301 | static void |
7819b5c3 | 1302 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 1303 | { |
1304 | Channel *c = NULL; | |
1305 | char *ctype; | |
0b242b12 | 1306 | int rchan; |
f91d9a89 | 1307 | u_int rmaxpack, rwindow, len; |
0b242b12 | 1308 | |
1309 | ctype = packet_get_string(&len); | |
1310 | rchan = packet_get_int(); | |
1311 | rwindow = packet_get_int(); | |
1312 | rmaxpack = packet_get_int(); | |
1313 | ||
1d1ffb87 | 1314 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
0b242b12 | 1315 | ctype, rchan, rwindow, rmaxpack); |
1316 | ||
fa08c86b | 1317 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
1318 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1319 | } else if (strcmp(ctype, "x11") == 0) { | |
1320 | c = client_request_x11(ctype, rchan); | |
1321 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1322 | c = client_request_agent(ctype, rchan); | |
0b242b12 | 1323 | } |
1324 | /* XXX duplicate : */ | |
1325 | if (c != NULL) { | |
1326 | debug("confirm %s", ctype); | |
1327 | c->remote_id = rchan; | |
1328 | c->remote_window = rwindow; | |
1329 | c->remote_maxpacket = rmaxpack; | |
a01a10dd | 1330 | if (c->type != SSH_CHANNEL_CONNECTING) { |
1331 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1332 | packet_put_int(c->remote_id); | |
1333 | packet_put_int(c->self); | |
1334 | packet_put_int(c->local_window); | |
1335 | packet_put_int(c->local_maxpacket); | |
1336 | packet_send(); | |
1337 | } | |
0b242b12 | 1338 | } else { |
1339 | debug("failure %s", ctype); | |
1340 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1341 | packet_put_int(rchan); | |
1342 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
fbe90f7b | 1343 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
a01a10dd | 1344 | packet_put_cstring("open failed"); |
fbe90f7b | 1345 | packet_put_cstring(""); |
1346 | } | |
0b242b12 | 1347 | packet_send(); |
1348 | } | |
1349 | xfree(ctype); | |
1350 | } | |
396c147e | 1351 | static void |
7819b5c3 | 1352 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
1fc8ccdf | 1353 | { |
1354 | Channel *c = NULL; | |
1355 | int id, reply, success = 0; | |
1356 | char *rtype; | |
1357 | ||
1358 | id = packet_get_int(); | |
1359 | rtype = packet_get_string(NULL); | |
1360 | reply = packet_get_char(); | |
1361 | ||
1362 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1363 | id, rtype, reply); | |
1364 | ||
1365 | if (session_ident == -1) { | |
1366 | error("client_input_channel_req: no channel %d", session_ident); | |
1367 | } else if (id != session_ident) { | |
1368 | error("client_input_channel_req: channel %d: wrong channel: %d", | |
1369 | session_ident, id); | |
1370 | } | |
1371 | c = channel_lookup(id); | |
1372 | if (c == NULL) { | |
1373 | error("client_input_channel_req: channel %d: unknown channel", id); | |
1374 | } else if (strcmp(rtype, "exit-status") == 0) { | |
1375 | success = 1; | |
1376 | exit_status = packet_get_int(); | |
95500969 | 1377 | packet_check_eom(); |
1fc8ccdf | 1378 | } |
1379 | if (reply) { | |
1380 | packet_start(success ? | |
1381 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1382 | packet_put_int(c->remote_id); | |
1383 | packet_send(); | |
1384 | } | |
1385 | xfree(rtype); | |
1386 | } | |
3d209bbe | 1387 | static void |
1388 | client_input_global_request(int type, u_int32_t seq, void *ctxt) | |
1389 | { | |
1390 | char *rtype; | |
1391 | int want_reply; | |
1392 | int success = 0; | |
1393 | ||
1394 | rtype = packet_get_string(NULL); | |
1395 | want_reply = packet_get_char(); | |
5d8d32a3 | 1396 | debug("client_input_global_request: rtype %s want_reply %d", |
1397 | rtype, want_reply); | |
3d209bbe | 1398 | if (want_reply) { |
1399 | packet_start(success ? | |
1400 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1401 | packet_send(); | |
1402 | packet_write_wait(); | |
1403 | } | |
1404 | xfree(rtype); | |
1405 | } | |
0b242b12 | 1406 | |
396c147e | 1407 | static void |
5ca51e19 | 1408 | client_init_dispatch_20(void) |
8ce64345 | 1409 | { |
7a37c112 | 1410 | dispatch_init(&dispatch_protocol_error); |
e0ae8728 | 1411 | |
8ce64345 | 1412 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
1413 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1414 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1415 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
0b242b12 | 1416 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
8ce64345 | 1417 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1418 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1fc8ccdf | 1419 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
8ce64345 | 1420 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
3d209bbe | 1421 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
7a37c112 | 1422 | |
1423 | /* rekeying */ | |
1424 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
e0ae8728 | 1425 | |
1426 | /* global request reply messages */ | |
1427 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); | |
1428 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); | |
8ce64345 | 1429 | } |
396c147e | 1430 | static void |
5ca51e19 | 1431 | client_init_dispatch_13(void) |
7368a6c8 | 1432 | { |
1433 | dispatch_init(NULL); | |
1434 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1435 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1436 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
7368a6c8 | 1437 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1438 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1439 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
7368a6c8 | 1440 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
1441 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1442 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
a22aff1f | 1443 | |
1444 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
c15706e2 | 1445 | &client_input_agent_open : &deny_input_open); |
a22aff1f | 1446 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
1447 | &x11_input_open : &deny_input_open); | |
7368a6c8 | 1448 | } |
396c147e | 1449 | static void |
5ca51e19 | 1450 | client_init_dispatch_15(void) |
7368a6c8 | 1451 | { |
1452 | client_init_dispatch_13(); | |
1453 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1454 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1455 | } | |
eea46d13 | 1456 | static void |
5ca51e19 | 1457 | client_init_dispatch(void) |
7368a6c8 | 1458 | { |
8ce64345 | 1459 | if (compat20) |
1460 | client_init_dispatch_20(); | |
1461 | else if (compat13) | |
7368a6c8 | 1462 | client_init_dispatch_13(); |
1463 | else | |
1464 | client_init_dispatch_15(); | |
1465 | } | |
82de775c | 1466 | |
1467 | /* client specific fatal cleanup */ | |
1468 | void | |
2362db19 | 1469 | cleanup_exit(int i) |
82de775c | 1470 | { |
82de775c | 1471 | leave_raw_mode(); |
1472 | leave_non_blocking(); | |
2362db19 | 1473 | _exit(i); |
82de775c | 1474 | } |