]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * The main loop for the interactive session (client side). | |
6 | * | |
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". | |
12 | * | |
13 | * | |
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 | * | |
36 | * | |
37 | * SSH2 support added by Markus Friedl. | |
38 | * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. | |
39 | * | |
40 | * Redistribution and use in source and binary forms, with or without | |
41 | * modification, are permitted provided that the following conditions | |
42 | * are met: | |
43 | * 1. Redistributions of source code must retain the above copyright | |
44 | * notice, this list of conditions and the following disclaimer. | |
45 | * 2. Redistributions in binary form must reproduce the above copyright | |
46 | * notice, this list of conditions and the following disclaimer in the | |
47 | * documentation and/or other materials provided with the distribution. | |
48 | * | |
49 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
50 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
51 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
52 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
53 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
54 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
55 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
56 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
57 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
58 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
59 | */ | |
60 | ||
61 | #include "includes.h" | |
62 | RCSID("$OpenBSD: clientloop.c,v 1.130 2004/08/11 21:43:04 avsm Exp $"); | |
63 | ||
64 | #include "ssh.h" | |
65 | #include "ssh1.h" | |
66 | #include "ssh2.h" | |
67 | #include "xmalloc.h" | |
68 | #include "packet.h" | |
69 | #include "buffer.h" | |
70 | #include "compat.h" | |
71 | #include "channels.h" | |
72 | #include "dispatch.h" | |
73 | #include "buffer.h" | |
74 | #include "bufaux.h" | |
75 | #include "key.h" | |
76 | #include "kex.h" | |
77 | #include "log.h" | |
78 | #include "readconf.h" | |
79 | #include "clientloop.h" | |
80 | #include "authfd.h" | |
81 | #include "atomicio.h" | |
82 | #include "sshpty.h" | |
83 | #include "misc.h" | |
84 | #include "monitor_fdpass.h" | |
85 | #include "match.h" | |
86 | #include "msg.h" | |
87 | ||
88 | /* import options */ | |
89 | extern Options options; | |
90 | ||
91 | /* Flag indicating that stdin should be redirected from /dev/null. */ | |
92 | extern int stdin_null_flag; | |
93 | ||
94 | /* Flag indicating that no shell has been requested */ | |
95 | extern int no_shell_flag; | |
96 | ||
97 | /* Control socket */ | |
98 | extern int control_fd; | |
99 | ||
100 | /* | |
101 | * Name of the host we are connecting to. This is the name given on the | |
102 | * command line, or the HostName specified for the user-supplied name in a | |
103 | * configuration file. | |
104 | */ | |
105 | extern char *host; | |
106 | ||
107 | /* | |
108 | * Flag to indicate that we have received a window change signal which has | |
109 | * not yet been processed. This will cause a message indicating the new | |
110 | * window size to be sent to the server a little later. This is volatile | |
111 | * because this is updated in a signal handler. | |
112 | */ | |
113 | static volatile sig_atomic_t received_window_change_signal = 0; | |
114 | static volatile sig_atomic_t received_signal = 0; | |
115 | ||
116 | /* Flag indicating whether the user\'s terminal is in non-blocking mode. */ | |
117 | static int in_non_blocking_mode = 0; | |
118 | ||
119 | /* Common data for the client loop code. */ | |
120 | static int quit_pending; /* Set to non-zero to quit the client loop. */ | |
121 | static int escape_char; /* Escape character. */ | |
122 | static int escape_pending; /* Last character was the escape character */ | |
123 | static int last_was_cr; /* Last character was a newline. */ | |
124 | static int exit_status; /* Used to store the exit status of the command. */ | |
125 | static int stdin_eof; /* EOF has been encountered on standard error. */ | |
126 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
127 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
128 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
129 | static u_long stdin_bytes, stdout_bytes, stderr_bytes; | |
130 | static u_int buffer_high;/* Soft max buffer size. */ | |
131 | static int connection_in; /* Connection to server (input). */ | |
132 | static int connection_out; /* Connection to server (output). */ | |
133 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ | |
134 | static int session_closed = 0; /* In SSH2: login session closed. */ | |
135 | static int server_alive_timeouts = 0; | |
136 | ||
137 | static void client_init_dispatch(void); | |
138 | int session_ident = -1; | |
139 | ||
140 | struct confirm_ctx { | |
141 | int want_tty; | |
142 | int want_subsys; | |
143 | Buffer cmd; | |
144 | char *term; | |
145 | struct termios tio; | |
146 | char **env; | |
147 | }; | |
148 | ||
149 | /*XXX*/ | |
150 | extern Kex *xxx_kex; | |
151 | ||
152 | void ssh_process_session2_setup(int, int, int, Buffer *); | |
153 | ||
154 | /* Restores stdin to blocking mode. */ | |
155 | ||
156 | static void | |
157 | leave_non_blocking(void) | |
158 | { | |
159 | if (in_non_blocking_mode) { | |
160 | unset_nonblock(fileno(stdin)); | |
161 | in_non_blocking_mode = 0; | |
162 | } | |
163 | } | |
164 | ||
165 | /* Puts stdin terminal in non-blocking mode. */ | |
166 | ||
167 | static void | |
168 | enter_non_blocking(void) | |
169 | { | |
170 | in_non_blocking_mode = 1; | |
171 | set_nonblock(fileno(stdin)); | |
172 | } | |
173 | ||
174 | /* | |
175 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
176 | * flag indicating that the window has changed. | |
177 | */ | |
178 | ||
179 | static void | |
180 | window_change_handler(int sig) | |
181 | { | |
182 | received_window_change_signal = 1; | |
183 | signal(SIGWINCH, window_change_handler); | |
184 | } | |
185 | ||
186 | /* | |
187 | * Signal handler for signals that cause the program to terminate. These | |
188 | * signals must be trapped to restore terminal modes. | |
189 | */ | |
190 | ||
191 | static void | |
192 | signal_handler(int sig) | |
193 | { | |
194 | received_signal = sig; | |
195 | quit_pending = 1; | |
196 | } | |
197 | ||
198 | /* | |
199 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
200 | * available resolution. | |
201 | */ | |
202 | ||
203 | static double | |
204 | get_current_time(void) | |
205 | { | |
206 | struct timeval tv; | |
207 | gettimeofday(&tv, NULL); | |
208 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
209 | } | |
210 | ||
211 | /* | |
212 | * This is called when the interactive is entered. This checks if there is | |
213 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
214 | * not appear to wake up when redirecting from /dev/null. | |
215 | */ | |
216 | ||
217 | static void | |
218 | client_check_initial_eof_on_stdin(void) | |
219 | { | |
220 | int len; | |
221 | char buf[1]; | |
222 | ||
223 | /* | |
224 | * If standard input is to be "redirected from /dev/null", we simply | |
225 | * mark that we have seen an EOF and send an EOF message to the | |
226 | * server. Otherwise, we try to read a single character; it appears | |
227 | * that for some files, such /dev/null, select() never wakes up for | |
228 | * read for this descriptor, which means that we never get EOF. This | |
229 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
230 | */ | |
231 | if (stdin_null_flag) { | |
232 | /* Fake EOF on stdin. */ | |
233 | debug("Sending eof."); | |
234 | stdin_eof = 1; | |
235 | packet_start(SSH_CMSG_EOF); | |
236 | packet_send(); | |
237 | } else { | |
238 | enter_non_blocking(); | |
239 | ||
240 | /* Check for immediate EOF on stdin. */ | |
241 | len = read(fileno(stdin), buf, 1); | |
242 | if (len == 0) { | |
243 | /* EOF. Record that we have seen it and send EOF to server. */ | |
244 | debug("Sending eof."); | |
245 | stdin_eof = 1; | |
246 | packet_start(SSH_CMSG_EOF); | |
247 | packet_send(); | |
248 | } else if (len > 0) { | |
249 | /* | |
250 | * Got data. We must store the data in the buffer, | |
251 | * and also process it as an escape character if | |
252 | * appropriate. | |
253 | */ | |
254 | if ((u_char) buf[0] == escape_char) | |
255 | escape_pending = 1; | |
256 | else | |
257 | buffer_append(&stdin_buffer, buf, 1); | |
258 | } | |
259 | leave_non_blocking(); | |
260 | } | |
261 | } | |
262 | ||
263 | ||
264 | /* | |
265 | * Make packets from buffered stdin data, and buffer them for sending to the | |
266 | * connection. | |
267 | */ | |
268 | ||
269 | static void | |
270 | client_make_packets_from_stdin_data(void) | |
271 | { | |
272 | u_int len; | |
273 | ||
274 | /* Send buffered stdin data to the server. */ | |
275 | while (buffer_len(&stdin_buffer) > 0 && | |
276 | packet_not_very_much_data_to_write()) { | |
277 | len = buffer_len(&stdin_buffer); | |
278 | /* Keep the packets at reasonable size. */ | |
279 | if (len > packet_get_maxsize()) | |
280 | len = packet_get_maxsize(); | |
281 | packet_start(SSH_CMSG_STDIN_DATA); | |
282 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
283 | packet_send(); | |
284 | buffer_consume(&stdin_buffer, len); | |
285 | stdin_bytes += len; | |
286 | /* If we have a pending EOF, send it now. */ | |
287 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
288 | packet_start(SSH_CMSG_EOF); | |
289 | packet_send(); | |
290 | } | |
291 | } | |
292 | } | |
293 | ||
294 | /* | |
295 | * Checks if the client window has changed, and sends a packet about it to | |
296 | * the server if so. The actual change is detected elsewhere (by a software | |
297 | * interrupt on Unix); this just checks the flag and sends a message if | |
298 | * appropriate. | |
299 | */ | |
300 | ||
301 | static void | |
302 | client_check_window_change(void) | |
303 | { | |
304 | struct winsize ws; | |
305 | ||
306 | if (! received_window_change_signal) | |
307 | return; | |
308 | /** XXX race */ | |
309 | received_window_change_signal = 0; | |
310 | ||
311 | debug2("client_check_window_change: changed"); | |
312 | ||
313 | if (compat20) { | |
314 | channel_send_window_changes(); | |
315 | } else { | |
316 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
317 | return; | |
318 | packet_start(SSH_CMSG_WINDOW_SIZE); | |
319 | packet_put_int(ws.ws_row); | |
320 | packet_put_int(ws.ws_col); | |
321 | packet_put_int(ws.ws_xpixel); | |
322 | packet_put_int(ws.ws_ypixel); | |
323 | packet_send(); | |
324 | } | |
325 | } | |
326 | ||
327 | static void | |
328 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
329 | { | |
330 | server_alive_timeouts = 0; | |
331 | client_global_request_reply_fwd(type, seq, ctxt); | |
332 | } | |
333 | ||
334 | static void | |
335 | server_alive_check(void) | |
336 | { | |
337 | if (++server_alive_timeouts > options.server_alive_count_max) | |
338 | packet_disconnect("Timeout, server not responding."); | |
339 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
340 | packet_put_cstring("keepalive@openssh.com"); | |
341 | packet_put_char(1); /* boolean: want reply */ | |
342 | packet_send(); | |
343 | } | |
344 | ||
345 | /* | |
346 | * Waits until the client can do something (some data becomes available on | |
347 | * one of the file descriptors). | |
348 | */ | |
349 | static void | |
350 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, | |
351 | int *maxfdp, u_int *nallocp, int rekeying) | |
352 | { | |
353 | struct timeval tv, *tvp; | |
354 | int ret; | |
355 | ||
356 | /* Add any selections by the channel mechanism. */ | |
357 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); | |
358 | ||
359 | if (!compat20) { | |
360 | /* Read from the connection, unless our buffers are full. */ | |
361 | if (buffer_len(&stdout_buffer) < buffer_high && | |
362 | buffer_len(&stderr_buffer) < buffer_high && | |
363 | channel_not_very_much_buffered_data()) | |
364 | FD_SET(connection_in, *readsetp); | |
365 | /* | |
366 | * Read from stdin, unless we have seen EOF or have very much | |
367 | * buffered data to send to the server. | |
368 | */ | |
369 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
370 | FD_SET(fileno(stdin), *readsetp); | |
371 | ||
372 | /* Select stdout/stderr if have data in buffer. */ | |
373 | if (buffer_len(&stdout_buffer) > 0) | |
374 | FD_SET(fileno(stdout), *writesetp); | |
375 | if (buffer_len(&stderr_buffer) > 0) | |
376 | FD_SET(fileno(stderr), *writesetp); | |
377 | } else { | |
378 | /* channel_prepare_select could have closed the last channel */ | |
379 | if (session_closed && !channel_still_open() && | |
380 | !packet_have_data_to_write()) { | |
381 | /* clear mask since we did not call select() */ | |
382 | memset(*readsetp, 0, *nallocp); | |
383 | memset(*writesetp, 0, *nallocp); | |
384 | return; | |
385 | } else { | |
386 | FD_SET(connection_in, *readsetp); | |
387 | } | |
388 | } | |
389 | ||
390 | /* Select server connection if have data to write to the server. */ | |
391 | if (packet_have_data_to_write()) | |
392 | FD_SET(connection_out, *writesetp); | |
393 | ||
394 | if (control_fd != -1) | |
395 | FD_SET(control_fd, *readsetp); | |
396 | ||
397 | /* | |
398 | * Wait for something to happen. This will suspend the process until | |
399 | * some selected descriptor can be read, written, or has some other | |
400 | * event pending. | |
401 | */ | |
402 | ||
403 | if (options.server_alive_interval == 0 || !compat20) | |
404 | tvp = NULL; | |
405 | else { | |
406 | tv.tv_sec = options.server_alive_interval; | |
407 | tv.tv_usec = 0; | |
408 | tvp = &tv; | |
409 | } | |
410 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); | |
411 | if (ret < 0) { | |
412 | char buf[100]; | |
413 | ||
414 | /* | |
415 | * We have to clear the select masks, because we return. | |
416 | * We have to return, because the mainloop checks for the flags | |
417 | * set by the signal handlers. | |
418 | */ | |
419 | memset(*readsetp, 0, *nallocp); | |
420 | memset(*writesetp, 0, *nallocp); | |
421 | ||
422 | if (errno == EINTR) | |
423 | return; | |
424 | /* Note: we might still have data in the buffers. */ | |
425 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
426 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
427 | quit_pending = 1; | |
428 | } else if (ret == 0) | |
429 | server_alive_check(); | |
430 | } | |
431 | ||
432 | static void | |
433 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) | |
434 | { | |
435 | struct winsize oldws, newws; | |
436 | ||
437 | /* Flush stdout and stderr buffers. */ | |
438 | if (buffer_len(bout) > 0) | |
439 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); | |
440 | if (buffer_len(berr) > 0) | |
441 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); | |
442 | ||
443 | leave_raw_mode(); | |
444 | ||
445 | /* | |
446 | * Free (and clear) the buffer to reduce the amount of data that gets | |
447 | * written to swap. | |
448 | */ | |
449 | buffer_free(bin); | |
450 | buffer_free(bout); | |
451 | buffer_free(berr); | |
452 | ||
453 | /* Save old window size. */ | |
454 | ioctl(fileno(stdin), TIOCGWINSZ, &oldws); | |
455 | ||
456 | /* Send the suspend signal to the program itself. */ | |
457 | kill(getpid(), SIGTSTP); | |
458 | ||
459 | /* Check if the window size has changed. */ | |
460 | if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 && | |
461 | (oldws.ws_row != newws.ws_row || | |
462 | oldws.ws_col != newws.ws_col || | |
463 | oldws.ws_xpixel != newws.ws_xpixel || | |
464 | oldws.ws_ypixel != newws.ws_ypixel)) | |
465 | received_window_change_signal = 1; | |
466 | ||
467 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
468 | buffer_init(bin); | |
469 | buffer_init(bout); | |
470 | buffer_init(berr); | |
471 | ||
472 | enter_raw_mode(); | |
473 | } | |
474 | ||
475 | static void | |
476 | client_process_net_input(fd_set * readset) | |
477 | { | |
478 | int len; | |
479 | char buf[8192]; | |
480 | ||
481 | /* | |
482 | * Read input from the server, and add any such data to the buffer of | |
483 | * the packet subsystem. | |
484 | */ | |
485 | if (FD_ISSET(connection_in, readset)) { | |
486 | /* Read as much as possible. */ | |
487 | len = read(connection_in, buf, sizeof(buf)); | |
488 | if (len == 0) { | |
489 | /* Received EOF. The remote host has closed the connection. */ | |
490 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
491 | host); | |
492 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
493 | quit_pending = 1; | |
494 | return; | |
495 | } | |
496 | /* | |
497 | * There is a kernel bug on Solaris that causes select to | |
498 | * sometimes wake up even though there is no data available. | |
499 | */ | |
500 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) | |
501 | len = 0; | |
502 | ||
503 | if (len < 0) { | |
504 | /* An error has encountered. Perhaps there is a network problem. */ | |
505 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
506 | host, strerror(errno)); | |
507 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
508 | quit_pending = 1; | |
509 | return; | |
510 | } | |
511 | packet_process_incoming(buf, len); | |
512 | } | |
513 | } | |
514 | ||
515 | static void | |
516 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) | |
517 | { | |
518 | int id; | |
519 | Channel *c; | |
520 | ||
521 | id = packet_get_int(); | |
522 | packet_check_eom(); | |
523 | ||
524 | if ((c = channel_lookup(id)) == NULL) { | |
525 | error("%s: no channel for id %d", __func__, id); | |
526 | return; | |
527 | } | |
528 | ||
529 | if (type == SSH2_MSG_CHANNEL_SUCCESS) | |
530 | debug2("Request suceeded on channel %d", id); | |
531 | else if (type == SSH2_MSG_CHANNEL_FAILURE) { | |
532 | error("Request failed on channel %d", id); | |
533 | channel_free(c); | |
534 | } | |
535 | } | |
536 | ||
537 | static void | |
538 | client_extra_session2_setup(int id, void *arg) | |
539 | { | |
540 | struct confirm_ctx *cctx = arg; | |
541 | Channel *c; | |
542 | int i; | |
543 | ||
544 | if (cctx == NULL) | |
545 | fatal("%s: cctx == NULL", __func__); | |
546 | if ((c = channel_lookup(id)) == NULL) | |
547 | fatal("%s: no channel for id %d", __func__, id); | |
548 | ||
549 | client_session2_setup(id, cctx->want_tty, cctx->want_subsys, | |
550 | cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env, | |
551 | client_subsystem_reply); | |
552 | ||
553 | c->confirm_ctx = NULL; | |
554 | buffer_free(&cctx->cmd); | |
555 | xfree(cctx->term); | |
556 | if (cctx->env != NULL) { | |
557 | for (i = 0; cctx->env[i] != NULL; i++) | |
558 | xfree(cctx->env[i]); | |
559 | xfree(cctx->env); | |
560 | } | |
561 | xfree(cctx); | |
562 | } | |
563 | ||
564 | static void | |
565 | client_process_control(fd_set * readset) | |
566 | { | |
567 | Buffer m; | |
568 | Channel *c; | |
569 | int client_fd, new_fd[3], ver, i, allowed; | |
570 | socklen_t addrlen; | |
571 | struct sockaddr_storage addr; | |
572 | struct confirm_ctx *cctx; | |
573 | char *cmd; | |
574 | u_int len, env_len; | |
575 | uid_t euid; | |
576 | gid_t egid; | |
577 | ||
578 | /* | |
579 | * Accept connection on control socket | |
580 | */ | |
581 | if (control_fd == -1 || !FD_ISSET(control_fd, readset)) | |
582 | return; | |
583 | ||
584 | memset(&addr, 0, sizeof(addr)); | |
585 | addrlen = sizeof(addr); | |
586 | if ((client_fd = accept(control_fd, | |
587 | (struct sockaddr*)&addr, &addrlen)) == -1) { | |
588 | error("%s accept: %s", __func__, strerror(errno)); | |
589 | return; | |
590 | } | |
591 | ||
592 | if (getpeereid(client_fd, &euid, &egid) < 0) { | |
593 | error("%s getpeereid failed: %s", __func__, strerror(errno)); | |
594 | close(client_fd); | |
595 | return; | |
596 | } | |
597 | if ((euid != 0) && (getuid() != euid)) { | |
598 | error("control mode uid mismatch: peer euid %u != uid %u", | |
599 | (u_int) euid, (u_int) getuid()); | |
600 | close(client_fd); | |
601 | return; | |
602 | } | |
603 | ||
604 | allowed = 1; | |
605 | if (options.control_master == 2) { | |
606 | char *p, prompt[1024]; | |
607 | ||
608 | allowed = 0; | |
609 | snprintf(prompt, sizeof(prompt), | |
610 | "Allow shared connection to %s? ", host); | |
611 | p = read_passphrase(prompt, RP_USE_ASKPASS|RP_ALLOW_EOF); | |
612 | if (p != NULL) { | |
613 | /* | |
614 | * Accept empty responses and responses consisting | |
615 | * of the word "yes" as affirmative. | |
616 | */ | |
617 | if (*p == '\0' || *p == '\n' || | |
618 | strcasecmp(p, "yes") == 0) | |
619 | allowed = 1; | |
620 | xfree(p); | |
621 | } | |
622 | } | |
623 | ||
624 | unset_nonblock(client_fd); | |
625 | ||
626 | buffer_init(&m); | |
627 | ||
628 | buffer_put_int(&m, allowed); | |
629 | buffer_put_int(&m, getpid()); | |
630 | if (ssh_msg_send(client_fd, /* version */0, &m) == -1) { | |
631 | error("%s: client msg_send failed", __func__); | |
632 | close(client_fd); | |
633 | buffer_free(&m); | |
634 | return; | |
635 | } | |
636 | buffer_clear(&m); | |
637 | ||
638 | if (!allowed) { | |
639 | error("Refused control connection"); | |
640 | close(client_fd); | |
641 | buffer_free(&m); | |
642 | return; | |
643 | } | |
644 | ||
645 | if (ssh_msg_recv(client_fd, &m) == -1) { | |
646 | error("%s: client msg_recv failed", __func__); | |
647 | close(client_fd); | |
648 | buffer_free(&m); | |
649 | return; | |
650 | } | |
651 | ||
652 | if ((ver = buffer_get_char(&m)) != 0) { | |
653 | error("%s: wrong client version %d", __func__, ver); | |
654 | buffer_free(&m); | |
655 | close(client_fd); | |
656 | return; | |
657 | } | |
658 | ||
659 | cctx = xmalloc(sizeof(*cctx)); | |
660 | memset(cctx, 0, sizeof(*cctx)); | |
661 | ||
662 | cctx->want_tty = buffer_get_int(&m); | |
663 | cctx->want_subsys = buffer_get_int(&m); | |
664 | cctx->term = buffer_get_string(&m, &len); | |
665 | ||
666 | cmd = buffer_get_string(&m, &len); | |
667 | buffer_init(&cctx->cmd); | |
668 | buffer_append(&cctx->cmd, cmd, strlen(cmd)); | |
669 | ||
670 | env_len = buffer_get_int(&m); | |
671 | env_len = MIN(env_len, 4096); | |
672 | debug3("%s: receiving %d env vars", __func__, env_len); | |
673 | if (env_len != 0) { | |
674 | cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1)); | |
675 | for (i = 0; i < env_len; i++) | |
676 | cctx->env[i] = buffer_get_string(&m, &len); | |
677 | cctx->env[i] = NULL; | |
678 | } | |
679 | ||
680 | debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__, | |
681 | cctx->want_tty, cctx->want_subsys, cmd); | |
682 | ||
683 | /* Gather fds from client */ | |
684 | new_fd[0] = mm_receive_fd(client_fd); | |
685 | new_fd[1] = mm_receive_fd(client_fd); | |
686 | new_fd[2] = mm_receive_fd(client_fd); | |
687 | ||
688 | debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__, | |
689 | new_fd[0], new_fd[1], new_fd[2]); | |
690 | ||
691 | /* Try to pick up ttymodes from client before it goes raw */ | |
692 | if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1) | |
693 | error("%s: tcgetattr: %s", __func__, strerror(errno)); | |
694 | ||
695 | buffer_clear(&m); | |
696 | if (ssh_msg_send(client_fd, /* version */0, &m) == -1) { | |
697 | error("%s: client msg_send failed", __func__); | |
698 | close(client_fd); | |
699 | close(new_fd[0]); | |
700 | close(new_fd[1]); | |
701 | close(new_fd[2]); | |
702 | buffer_free(&m); | |
703 | return; | |
704 | } | |
705 | buffer_free(&m); | |
706 | ||
707 | /* enable nonblocking unless tty */ | |
708 | if (!isatty(new_fd[0])) | |
709 | set_nonblock(new_fd[0]); | |
710 | if (!isatty(new_fd[1])) | |
711 | set_nonblock(new_fd[1]); | |
712 | if (!isatty(new_fd[2])) | |
713 | set_nonblock(new_fd[2]); | |
714 | ||
715 | set_nonblock(client_fd); | |
716 | ||
717 | c = channel_new("session", SSH_CHANNEL_OPENING, | |
718 | new_fd[0], new_fd[1], new_fd[2], | |
719 | CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT, | |
720 | CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0); | |
721 | ||
722 | /* XXX */ | |
723 | c->ctl_fd = client_fd; | |
724 | ||
725 | debug3("%s: channel_new: %d", __func__, c->self); | |
726 | ||
727 | channel_send_open(c->self); | |
728 | channel_register_confirm(c->self, client_extra_session2_setup, cctx); | |
729 | } | |
730 | ||
731 | static void | |
732 | process_cmdline(void) | |
733 | { | |
734 | void (*handler)(int); | |
735 | char *s, *cmd; | |
736 | u_short fwd_port, fwd_host_port; | |
737 | char buf[1024], sfwd_port[6], sfwd_host_port[6]; | |
738 | int delete = 0; | |
739 | int local = 0; | |
740 | ||
741 | leave_raw_mode(); | |
742 | handler = signal(SIGINT, SIG_IGN); | |
743 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); | |
744 | if (s == NULL) | |
745 | goto out; | |
746 | while (*s && isspace(*s)) | |
747 | s++; | |
748 | if (*s == '-') | |
749 | s++; /* Skip cmdline '-', if any */ | |
750 | if (*s == '\0') | |
751 | goto out; | |
752 | ||
753 | if (*s == 'h' || *s == 'H' || *s == '?') { | |
754 | logit("Commands:"); | |
755 | logit(" -Lport:host:hostport Request local forward"); | |
756 | logit(" -Rport:host:hostport Request remote forward"); | |
757 | logit(" -KRhostport Cancel remote forward"); | |
758 | goto out; | |
759 | } | |
760 | ||
761 | if (*s == 'K') { | |
762 | delete = 1; | |
763 | s++; | |
764 | } | |
765 | if (*s != 'L' && *s != 'R') { | |
766 | logit("Invalid command."); | |
767 | goto out; | |
768 | } | |
769 | if (*s == 'L') | |
770 | local = 1; | |
771 | if (local && delete) { | |
772 | logit("Not supported."); | |
773 | goto out; | |
774 | } | |
775 | if ((!local || delete) && !compat20) { | |
776 | logit("Not supported for SSH protocol version 1."); | |
777 | goto out; | |
778 | } | |
779 | ||
780 | s++; | |
781 | while (*s && isspace(*s)) | |
782 | s++; | |
783 | ||
784 | if (delete) { | |
785 | if (sscanf(s, "%5[0-9]", sfwd_host_port) != 1) { | |
786 | logit("Bad forwarding specification."); | |
787 | goto out; | |
788 | } | |
789 | if ((fwd_host_port = a2port(sfwd_host_port)) == 0) { | |
790 | logit("Bad forwarding port(s)."); | |
791 | goto out; | |
792 | } | |
793 | channel_request_rforward_cancel(fwd_host_port); | |
794 | } else { | |
795 | if (sscanf(s, "%5[0-9]:%255[^:]:%5[0-9]", | |
796 | sfwd_port, buf, sfwd_host_port) != 3 && | |
797 | sscanf(s, "%5[0-9]/%255[^/]/%5[0-9]", | |
798 | sfwd_port, buf, sfwd_host_port) != 3) { | |
799 | logit("Bad forwarding specification."); | |
800 | goto out; | |
801 | } | |
802 | if ((fwd_port = a2port(sfwd_port)) == 0 || | |
803 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { | |
804 | logit("Bad forwarding port(s)."); | |
805 | goto out; | |
806 | } | |
807 | if (local) { | |
808 | if (channel_setup_local_fwd_listener(fwd_port, buf, | |
809 | fwd_host_port, options.gateway_ports) < 0) { | |
810 | logit("Port forwarding failed."); | |
811 | goto out; | |
812 | } | |
813 | } else | |
814 | channel_request_remote_forwarding(fwd_port, buf, | |
815 | fwd_host_port); | |
816 | logit("Forwarding port."); | |
817 | } | |
818 | ||
819 | out: | |
820 | signal(SIGINT, handler); | |
821 | enter_raw_mode(); | |
822 | if (cmd) | |
823 | xfree(cmd); | |
824 | } | |
825 | ||
826 | /* process the characters one by one */ | |
827 | static int | |
828 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) | |
829 | { | |
830 | char string[1024]; | |
831 | pid_t pid; | |
832 | int bytes = 0; | |
833 | u_int i; | |
834 | u_char ch; | |
835 | char *s; | |
836 | ||
837 | for (i = 0; i < len; i++) { | |
838 | /* Get one character at a time. */ | |
839 | ch = buf[i]; | |
840 | ||
841 | if (escape_pending) { | |
842 | /* We have previously seen an escape character. */ | |
843 | /* Clear the flag now. */ | |
844 | escape_pending = 0; | |
845 | ||
846 | /* Process the escaped character. */ | |
847 | switch (ch) { | |
848 | case '.': | |
849 | /* Terminate the connection. */ | |
850 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
851 | buffer_append(berr, string, strlen(string)); | |
852 | ||
853 | quit_pending = 1; | |
854 | return -1; | |
855 | ||
856 | case 'Z' - 64: | |
857 | /* Suspend the program. */ | |
858 | /* Print a message to that effect to the user. */ | |
859 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
860 | buffer_append(berr, string, strlen(string)); | |
861 | ||
862 | /* Restore terminal modes and suspend. */ | |
863 | client_suspend_self(bin, bout, berr); | |
864 | ||
865 | /* We have been continued. */ | |
866 | continue; | |
867 | ||
868 | case 'B': | |
869 | if (compat20) { | |
870 | snprintf(string, sizeof string, | |
871 | "%cB\r\n", escape_char); | |
872 | buffer_append(berr, string, | |
873 | strlen(string)); | |
874 | channel_request_start(session_ident, | |
875 | "break", 0); | |
876 | packet_put_int(1000); | |
877 | packet_send(); | |
878 | } | |
879 | continue; | |
880 | ||
881 | case 'R': | |
882 | if (compat20) { | |
883 | if (datafellows & SSH_BUG_NOREKEY) | |
884 | logit("Server does not support re-keying"); | |
885 | else | |
886 | need_rekeying = 1; | |
887 | } | |
888 | continue; | |
889 | ||
890 | case '&': | |
891 | /* | |
892 | * Detach the program (continue to serve connections, | |
893 | * but put in background and no more new connections). | |
894 | */ | |
895 | /* Restore tty modes. */ | |
896 | leave_raw_mode(); | |
897 | ||
898 | /* Stop listening for new connections. */ | |
899 | channel_stop_listening(); | |
900 | ||
901 | snprintf(string, sizeof string, | |
902 | "%c& [backgrounded]\n", escape_char); | |
903 | buffer_append(berr, string, strlen(string)); | |
904 | ||
905 | /* Fork into background. */ | |
906 | pid = fork(); | |
907 | if (pid < 0) { | |
908 | error("fork: %.100s", strerror(errno)); | |
909 | continue; | |
910 | } | |
911 | if (pid != 0) { /* This is the parent. */ | |
912 | /* The parent just exits. */ | |
913 | exit(0); | |
914 | } | |
915 | /* The child continues serving connections. */ | |
916 | if (compat20) { | |
917 | buffer_append(bin, "\004", 1); | |
918 | /* fake EOF on stdin */ | |
919 | return -1; | |
920 | } else if (!stdin_eof) { | |
921 | /* | |
922 | * Sending SSH_CMSG_EOF alone does not always appear | |
923 | * to be enough. So we try to send an EOF character | |
924 | * first. | |
925 | */ | |
926 | packet_start(SSH_CMSG_STDIN_DATA); | |
927 | packet_put_string("\004", 1); | |
928 | packet_send(); | |
929 | /* Close stdin. */ | |
930 | stdin_eof = 1; | |
931 | if (buffer_len(bin) == 0) { | |
932 | packet_start(SSH_CMSG_EOF); | |
933 | packet_send(); | |
934 | } | |
935 | } | |
936 | continue; | |
937 | ||
938 | case '?': | |
939 | snprintf(string, sizeof string, | |
940 | "%c?\r\n\ | |
941 | Supported escape sequences:\r\n\ | |
942 | %c. - terminate connection\r\n\ | |
943 | %cB - send a BREAK to the remote system\r\n\ | |
944 | %cC - open a command line\r\n\ | |
945 | %cR - Request rekey (SSH protocol 2 only)\r\n\ | |
946 | %c^Z - suspend ssh\r\n\ | |
947 | %c# - list forwarded connections\r\n\ | |
948 | %c& - background ssh (when waiting for connections to terminate)\r\n\ | |
949 | %c? - this message\r\n\ | |
950 | %c%c - send the escape character by typing it twice\r\n\ | |
951 | (Note that escapes are only recognized immediately after newline.)\r\n", | |
952 | escape_char, escape_char, escape_char, escape_char, | |
953 | escape_char, escape_char, escape_char, escape_char, | |
954 | escape_char, escape_char, escape_char); | |
955 | buffer_append(berr, string, strlen(string)); | |
956 | continue; | |
957 | ||
958 | case '#': | |
959 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
960 | buffer_append(berr, string, strlen(string)); | |
961 | s = channel_open_message(); | |
962 | buffer_append(berr, s, strlen(s)); | |
963 | xfree(s); | |
964 | continue; | |
965 | ||
966 | case 'C': | |
967 | process_cmdline(); | |
968 | continue; | |
969 | ||
970 | default: | |
971 | if (ch != escape_char) { | |
972 | buffer_put_char(bin, escape_char); | |
973 | bytes++; | |
974 | } | |
975 | /* Escaped characters fall through here */ | |
976 | break; | |
977 | } | |
978 | } else { | |
979 | /* | |
980 | * The previous character was not an escape char. Check if this | |
981 | * is an escape. | |
982 | */ | |
983 | if (last_was_cr && ch == escape_char) { | |
984 | /* It is. Set the flag and continue to next character. */ | |
985 | escape_pending = 1; | |
986 | continue; | |
987 | } | |
988 | } | |
989 | ||
990 | /* | |
991 | * Normal character. Record whether it was a newline, | |
992 | * and append it to the buffer. | |
993 | */ | |
994 | last_was_cr = (ch == '\r' || ch == '\n'); | |
995 | buffer_put_char(bin, ch); | |
996 | bytes++; | |
997 | } | |
998 | return bytes; | |
999 | } | |
1000 | ||
1001 | static void | |
1002 | client_process_input(fd_set * readset) | |
1003 | { | |
1004 | int len; | |
1005 | char buf[8192]; | |
1006 | ||
1007 | /* Read input from stdin. */ | |
1008 | if (FD_ISSET(fileno(stdin), readset)) { | |
1009 | /* Read as much as possible. */ | |
1010 | len = read(fileno(stdin), buf, sizeof(buf)); | |
1011 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) | |
1012 | return; /* we'll try again later */ | |
1013 | if (len <= 0) { | |
1014 | /* | |
1015 | * Received EOF or error. They are treated | |
1016 | * similarly, except that an error message is printed | |
1017 | * if it was an error condition. | |
1018 | */ | |
1019 | if (len < 0) { | |
1020 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
1021 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1022 | } | |
1023 | /* Mark that we have seen EOF. */ | |
1024 | stdin_eof = 1; | |
1025 | /* | |
1026 | * Send an EOF message to the server unless there is | |
1027 | * data in the buffer. If there is data in the | |
1028 | * buffer, no message will be sent now. Code | |
1029 | * elsewhere will send the EOF when the buffer | |
1030 | * becomes empty if stdin_eof is set. | |
1031 | */ | |
1032 | if (buffer_len(&stdin_buffer) == 0) { | |
1033 | packet_start(SSH_CMSG_EOF); | |
1034 | packet_send(); | |
1035 | } | |
1036 | } else if (escape_char == SSH_ESCAPECHAR_NONE) { | |
1037 | /* | |
1038 | * Normal successful read, and no escape character. | |
1039 | * Just append the data to buffer. | |
1040 | */ | |
1041 | buffer_append(&stdin_buffer, buf, len); | |
1042 | } else { | |
1043 | /* | |
1044 | * Normal, successful read. But we have an escape character | |
1045 | * and have to process the characters one by one. | |
1046 | */ | |
1047 | if (process_escapes(&stdin_buffer, &stdout_buffer, | |
1048 | &stderr_buffer, buf, len) == -1) | |
1049 | return; | |
1050 | } | |
1051 | } | |
1052 | } | |
1053 | ||
1054 | static void | |
1055 | client_process_output(fd_set * writeset) | |
1056 | { | |
1057 | int len; | |
1058 | char buf[100]; | |
1059 | ||
1060 | /* Write buffered output to stdout. */ | |
1061 | if (FD_ISSET(fileno(stdout), writeset)) { | |
1062 | /* Write as much data as possible. */ | |
1063 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
1064 | buffer_len(&stdout_buffer)); | |
1065 | if (len <= 0) { | |
1066 | if (errno == EINTR || errno == EAGAIN) | |
1067 | len = 0; | |
1068 | else { | |
1069 | /* | |
1070 | * An error or EOF was encountered. Put an | |
1071 | * error message to stderr buffer. | |
1072 | */ | |
1073 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); | |
1074 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1075 | quit_pending = 1; | |
1076 | return; | |
1077 | } | |
1078 | } | |
1079 | /* Consume printed data from the buffer. */ | |
1080 | buffer_consume(&stdout_buffer, len); | |
1081 | stdout_bytes += len; | |
1082 | } | |
1083 | /* Write buffered output to stderr. */ | |
1084 | if (FD_ISSET(fileno(stderr), writeset)) { | |
1085 | /* Write as much data as possible. */ | |
1086 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
1087 | buffer_len(&stderr_buffer)); | |
1088 | if (len <= 0) { | |
1089 | if (errno == EINTR || errno == EAGAIN) | |
1090 | len = 0; | |
1091 | else { | |
1092 | /* EOF or error, but can't even print error message. */ | |
1093 | quit_pending = 1; | |
1094 | return; | |
1095 | } | |
1096 | } | |
1097 | /* Consume printed characters from the buffer. */ | |
1098 | buffer_consume(&stderr_buffer, len); | |
1099 | stderr_bytes += len; | |
1100 | } | |
1101 | } | |
1102 | ||
1103 | /* | |
1104 | * Get packets from the connection input buffer, and process them as long as | |
1105 | * there are packets available. | |
1106 | * | |
1107 | * Any unknown packets received during the actual | |
1108 | * session cause the session to terminate. This is | |
1109 | * intended to make debugging easier since no | |
1110 | * confirmations are sent. Any compatible protocol | |
1111 | * extensions must be negotiated during the | |
1112 | * preparatory phase. | |
1113 | */ | |
1114 | ||
1115 | static void | |
1116 | client_process_buffered_input_packets(void) | |
1117 | { | |
1118 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); | |
1119 | } | |
1120 | ||
1121 | /* scan buf[] for '~' before sending data to the peer */ | |
1122 | ||
1123 | static int | |
1124 | simple_escape_filter(Channel *c, char *buf, int len) | |
1125 | { | |
1126 | /* XXX we assume c->extended is writeable */ | |
1127 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
1128 | } | |
1129 | ||
1130 | static void | |
1131 | client_channel_closed(int id, void *arg) | |
1132 | { | |
1133 | channel_cancel_cleanup(id); | |
1134 | session_closed = 1; | |
1135 | leave_raw_mode(); | |
1136 | } | |
1137 | ||
1138 | /* | |
1139 | * Implements the interactive session with the server. This is called after | |
1140 | * the user has been authenticated, and a command has been started on the | |
1141 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character | |
1142 | * used as an escape character for terminating or suspending the session. | |
1143 | */ | |
1144 | ||
1145 | int | |
1146 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) | |
1147 | { | |
1148 | fd_set *readset = NULL, *writeset = NULL; | |
1149 | double start_time, total_time; | |
1150 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0; | |
1151 | u_int nalloc = 0; | |
1152 | char buf[100]; | |
1153 | ||
1154 | debug("Entering interactive session."); | |
1155 | ||
1156 | start_time = get_current_time(); | |
1157 | ||
1158 | /* Initialize variables. */ | |
1159 | escape_pending = 0; | |
1160 | last_was_cr = 1; | |
1161 | exit_status = -1; | |
1162 | stdin_eof = 0; | |
1163 | buffer_high = 64 * 1024; | |
1164 | connection_in = packet_get_connection_in(); | |
1165 | connection_out = packet_get_connection_out(); | |
1166 | max_fd = MAX(connection_in, connection_out); | |
1167 | if (control_fd != -1) | |
1168 | max_fd = MAX(max_fd, control_fd); | |
1169 | ||
1170 | if (!compat20) { | |
1171 | /* enable nonblocking unless tty */ | |
1172 | if (!isatty(fileno(stdin))) | |
1173 | set_nonblock(fileno(stdin)); | |
1174 | if (!isatty(fileno(stdout))) | |
1175 | set_nonblock(fileno(stdout)); | |
1176 | if (!isatty(fileno(stderr))) | |
1177 | set_nonblock(fileno(stderr)); | |
1178 | max_fd = MAX(max_fd, fileno(stdin)); | |
1179 | max_fd = MAX(max_fd, fileno(stdout)); | |
1180 | max_fd = MAX(max_fd, fileno(stderr)); | |
1181 | } | |
1182 | stdin_bytes = 0; | |
1183 | stdout_bytes = 0; | |
1184 | stderr_bytes = 0; | |
1185 | quit_pending = 0; | |
1186 | escape_char = escape_char_arg; | |
1187 | ||
1188 | /* Initialize buffers. */ | |
1189 | buffer_init(&stdin_buffer); | |
1190 | buffer_init(&stdout_buffer); | |
1191 | buffer_init(&stderr_buffer); | |
1192 | ||
1193 | client_init_dispatch(); | |
1194 | ||
1195 | /* | |
1196 | * Set signal handlers, (e.g. to restore non-blocking mode) | |
1197 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) | |
1198 | */ | |
1199 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) | |
1200 | signal(SIGINT, signal_handler); | |
1201 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) | |
1202 | signal(SIGQUIT, signal_handler); | |
1203 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) | |
1204 | signal(SIGTERM, signal_handler); | |
1205 | if (have_pty) | |
1206 | signal(SIGWINCH, window_change_handler); | |
1207 | ||
1208 | if (have_pty) | |
1209 | enter_raw_mode(); | |
1210 | ||
1211 | if (compat20) { | |
1212 | session_ident = ssh2_chan_id; | |
1213 | if (escape_char != SSH_ESCAPECHAR_NONE) | |
1214 | channel_register_filter(session_ident, | |
1215 | simple_escape_filter); | |
1216 | if (session_ident != -1) | |
1217 | channel_register_cleanup(session_ident, | |
1218 | client_channel_closed); | |
1219 | } else { | |
1220 | /* Check if we should immediately send eof on stdin. */ | |
1221 | client_check_initial_eof_on_stdin(); | |
1222 | } | |
1223 | ||
1224 | /* Main loop of the client for the interactive session mode. */ | |
1225 | while (!quit_pending) { | |
1226 | ||
1227 | /* Process buffered packets sent by the server. */ | |
1228 | client_process_buffered_input_packets(); | |
1229 | ||
1230 | if (compat20 && session_closed && !channel_still_open()) | |
1231 | break; | |
1232 | ||
1233 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
1234 | ||
1235 | if (rekeying) { | |
1236 | debug("rekeying in progress"); | |
1237 | } else { | |
1238 | /* | |
1239 | * Make packets of buffered stdin data, and buffer | |
1240 | * them for sending to the server. | |
1241 | */ | |
1242 | if (!compat20) | |
1243 | client_make_packets_from_stdin_data(); | |
1244 | ||
1245 | /* | |
1246 | * Make packets from buffered channel data, and | |
1247 | * enqueue them for sending to the server. | |
1248 | */ | |
1249 | if (packet_not_very_much_data_to_write()) | |
1250 | channel_output_poll(); | |
1251 | ||
1252 | /* | |
1253 | * Check if the window size has changed, and buffer a | |
1254 | * message about it to the server if so. | |
1255 | */ | |
1256 | client_check_window_change(); | |
1257 | ||
1258 | if (quit_pending) | |
1259 | break; | |
1260 | } | |
1261 | /* | |
1262 | * Wait until we have something to do (something becomes | |
1263 | * available on one of the descriptors). | |
1264 | */ | |
1265 | max_fd2 = max_fd; | |
1266 | client_wait_until_can_do_something(&readset, &writeset, | |
1267 | &max_fd2, &nalloc, rekeying); | |
1268 | ||
1269 | if (quit_pending) | |
1270 | break; | |
1271 | ||
1272 | /* Do channel operations unless rekeying in progress. */ | |
1273 | if (!rekeying) { | |
1274 | channel_after_select(readset, writeset); | |
1275 | if (need_rekeying || packet_need_rekeying()) { | |
1276 | debug("need rekeying"); | |
1277 | xxx_kex->done = 0; | |
1278 | kex_send_kexinit(xxx_kex); | |
1279 | need_rekeying = 0; | |
1280 | } | |
1281 | } | |
1282 | ||
1283 | /* Buffer input from the connection. */ | |
1284 | client_process_net_input(readset); | |
1285 | ||
1286 | /* Accept control connections. */ | |
1287 | client_process_control(readset); | |
1288 | ||
1289 | if (quit_pending) | |
1290 | break; | |
1291 | ||
1292 | if (!compat20) { | |
1293 | /* Buffer data from stdin */ | |
1294 | client_process_input(readset); | |
1295 | /* | |
1296 | * Process output to stdout and stderr. Output to | |
1297 | * the connection is processed elsewhere (above). | |
1298 | */ | |
1299 | client_process_output(writeset); | |
1300 | } | |
1301 | ||
1302 | /* Send as much buffered packet data as possible to the sender. */ | |
1303 | if (FD_ISSET(connection_out, writeset)) | |
1304 | packet_write_poll(); | |
1305 | } | |
1306 | if (readset) | |
1307 | xfree(readset); | |
1308 | if (writeset) | |
1309 | xfree(writeset); | |
1310 | ||
1311 | /* Terminate the session. */ | |
1312 | ||
1313 | /* Stop watching for window change. */ | |
1314 | if (have_pty) | |
1315 | signal(SIGWINCH, SIG_DFL); | |
1316 | ||
1317 | channel_free_all(); | |
1318 | ||
1319 | if (have_pty) | |
1320 | leave_raw_mode(); | |
1321 | ||
1322 | /* restore blocking io */ | |
1323 | if (!isatty(fileno(stdin))) | |
1324 | unset_nonblock(fileno(stdin)); | |
1325 | if (!isatty(fileno(stdout))) | |
1326 | unset_nonblock(fileno(stdout)); | |
1327 | if (!isatty(fileno(stderr))) | |
1328 | unset_nonblock(fileno(stderr)); | |
1329 | ||
1330 | /* | |
1331 | * If there was no shell or command requested, there will be no remote | |
1332 | * exit status to be returned. In that case, clear error code if the | |
1333 | * connection was deliberately terminated at this end. | |
1334 | */ | |
1335 | if (no_shell_flag && received_signal == SIGTERM) { | |
1336 | received_signal = 0; | |
1337 | exit_status = 0; | |
1338 | } | |
1339 | ||
1340 | if (received_signal) | |
1341 | fatal("Killed by signal %d.", (int) received_signal); | |
1342 | ||
1343 | /* | |
1344 | * In interactive mode (with pseudo tty) display a message indicating | |
1345 | * that the connection has been closed. | |
1346 | */ | |
1347 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { | |
1348 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
1349 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1350 | } | |
1351 | ||
1352 | /* Output any buffered data for stdout. */ | |
1353 | while (buffer_len(&stdout_buffer) > 0) { | |
1354 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
1355 | buffer_len(&stdout_buffer)); | |
1356 | if (len <= 0) { | |
1357 | error("Write failed flushing stdout buffer."); | |
1358 | break; | |
1359 | } | |
1360 | buffer_consume(&stdout_buffer, len); | |
1361 | stdout_bytes += len; | |
1362 | } | |
1363 | ||
1364 | /* Output any buffered data for stderr. */ | |
1365 | while (buffer_len(&stderr_buffer) > 0) { | |
1366 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
1367 | buffer_len(&stderr_buffer)); | |
1368 | if (len <= 0) { | |
1369 | error("Write failed flushing stderr buffer."); | |
1370 | break; | |
1371 | } | |
1372 | buffer_consume(&stderr_buffer, len); | |
1373 | stderr_bytes += len; | |
1374 | } | |
1375 | ||
1376 | /* Clear and free any buffers. */ | |
1377 | memset(buf, 0, sizeof(buf)); | |
1378 | buffer_free(&stdin_buffer); | |
1379 | buffer_free(&stdout_buffer); | |
1380 | buffer_free(&stderr_buffer); | |
1381 | ||
1382 | /* Report bytes transferred, and transfer rates. */ | |
1383 | total_time = get_current_time() - start_time; | |
1384 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
1385 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); | |
1386 | if (total_time > 0) | |
1387 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
1388 | stdin_bytes / total_time, stdout_bytes / total_time, | |
1389 | stderr_bytes / total_time); | |
1390 | ||
1391 | /* Return the exit status of the program. */ | |
1392 | debug("Exit status %d", exit_status); | |
1393 | return exit_status; | |
1394 | } | |
1395 | ||
1396 | /*********/ | |
1397 | ||
1398 | static void | |
1399 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) | |
1400 | { | |
1401 | u_int data_len; | |
1402 | char *data = packet_get_string(&data_len); | |
1403 | packet_check_eom(); | |
1404 | buffer_append(&stdout_buffer, data, data_len); | |
1405 | memset(data, 0, data_len); | |
1406 | xfree(data); | |
1407 | } | |
1408 | static void | |
1409 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) | |
1410 | { | |
1411 | u_int data_len; | |
1412 | char *data = packet_get_string(&data_len); | |
1413 | packet_check_eom(); | |
1414 | buffer_append(&stderr_buffer, data, data_len); | |
1415 | memset(data, 0, data_len); | |
1416 | xfree(data); | |
1417 | } | |
1418 | static void | |
1419 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) | |
1420 | { | |
1421 | exit_status = packet_get_int(); | |
1422 | packet_check_eom(); | |
1423 | /* Acknowledge the exit. */ | |
1424 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1425 | packet_send(); | |
1426 | /* | |
1427 | * Must wait for packet to be sent since we are | |
1428 | * exiting the loop. | |
1429 | */ | |
1430 | packet_write_wait(); | |
1431 | /* Flag that we want to exit. */ | |
1432 | quit_pending = 1; | |
1433 | } | |
1434 | static void | |
1435 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) | |
1436 | { | |
1437 | Channel *c = NULL; | |
1438 | int remote_id, sock; | |
1439 | ||
1440 | /* Read the remote channel number from the message. */ | |
1441 | remote_id = packet_get_int(); | |
1442 | packet_check_eom(); | |
1443 | ||
1444 | /* | |
1445 | * Get a connection to the local authentication agent (this may again | |
1446 | * get forwarded). | |
1447 | */ | |
1448 | sock = ssh_get_authentication_socket(); | |
1449 | ||
1450 | /* | |
1451 | * If we could not connect the agent, send an error message back to | |
1452 | * the server. This should never happen unless the agent dies, | |
1453 | * because authentication forwarding is only enabled if we have an | |
1454 | * agent. | |
1455 | */ | |
1456 | if (sock >= 0) { | |
1457 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, | |
1458 | -1, 0, 0, 0, "authentication agent connection", 1); | |
1459 | c->remote_id = remote_id; | |
1460 | c->force_drain = 1; | |
1461 | } | |
1462 | if (c == NULL) { | |
1463 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1464 | packet_put_int(remote_id); | |
1465 | } else { | |
1466 | /* Send a confirmation to the remote host. */ | |
1467 | debug("Forwarding authentication connection."); | |
1468 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1469 | packet_put_int(remote_id); | |
1470 | packet_put_int(c->self); | |
1471 | } | |
1472 | packet_send(); | |
1473 | } | |
1474 | ||
1475 | static Channel * | |
1476 | client_request_forwarded_tcpip(const char *request_type, int rchan) | |
1477 | { | |
1478 | Channel *c = NULL; | |
1479 | char *listen_address, *originator_address; | |
1480 | int listen_port, originator_port; | |
1481 | int sock; | |
1482 | ||
1483 | /* Get rest of the packet */ | |
1484 | listen_address = packet_get_string(NULL); | |
1485 | listen_port = packet_get_int(); | |
1486 | originator_address = packet_get_string(NULL); | |
1487 | originator_port = packet_get_int(); | |
1488 | packet_check_eom(); | |
1489 | ||
1490 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", | |
1491 | listen_address, listen_port, originator_address, originator_port); | |
1492 | ||
1493 | sock = channel_connect_by_listen_address(listen_port); | |
1494 | if (sock < 0) { | |
1495 | xfree(originator_address); | |
1496 | xfree(listen_address); | |
1497 | return NULL; | |
1498 | } | |
1499 | c = channel_new("forwarded-tcpip", | |
1500 | SSH_CHANNEL_CONNECTING, sock, sock, -1, | |
1501 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
1502 | originator_address, 1); | |
1503 | xfree(originator_address); | |
1504 | xfree(listen_address); | |
1505 | return c; | |
1506 | } | |
1507 | ||
1508 | static Channel * | |
1509 | client_request_x11(const char *request_type, int rchan) | |
1510 | { | |
1511 | Channel *c = NULL; | |
1512 | char *originator; | |
1513 | int originator_port; | |
1514 | int sock; | |
1515 | ||
1516 | if (!options.forward_x11) { | |
1517 | error("Warning: ssh server tried X11 forwarding."); | |
1518 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1519 | return NULL; | |
1520 | } | |
1521 | originator = packet_get_string(NULL); | |
1522 | if (datafellows & SSH_BUG_X11FWD) { | |
1523 | debug2("buggy server: x11 request w/o originator_port"); | |
1524 | originator_port = 0; | |
1525 | } else { | |
1526 | originator_port = packet_get_int(); | |
1527 | } | |
1528 | packet_check_eom(); | |
1529 | /* XXX check permission */ | |
1530 | debug("client_request_x11: request from %s %d", originator, | |
1531 | originator_port); | |
1532 | xfree(originator); | |
1533 | sock = x11_connect_display(); | |
1534 | if (sock < 0) | |
1535 | return NULL; | |
1536 | c = channel_new("x11", | |
1537 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
1538 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); | |
1539 | c->force_drain = 1; | |
1540 | return c; | |
1541 | } | |
1542 | ||
1543 | static Channel * | |
1544 | client_request_agent(const char *request_type, int rchan) | |
1545 | { | |
1546 | Channel *c = NULL; | |
1547 | int sock; | |
1548 | ||
1549 | if (!options.forward_agent) { | |
1550 | error("Warning: ssh server tried agent forwarding."); | |
1551 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1552 | return NULL; | |
1553 | } | |
1554 | sock = ssh_get_authentication_socket(); | |
1555 | if (sock < 0) | |
1556 | return NULL; | |
1557 | c = channel_new("authentication agent connection", | |
1558 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1559 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
1560 | "authentication agent connection", 1); | |
1561 | c->force_drain = 1; | |
1562 | return c; | |
1563 | } | |
1564 | ||
1565 | /* XXXX move to generic input handler */ | |
1566 | static void | |
1567 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) | |
1568 | { | |
1569 | Channel *c = NULL; | |
1570 | char *ctype; | |
1571 | int rchan; | |
1572 | u_int rmaxpack, rwindow, len; | |
1573 | ||
1574 | ctype = packet_get_string(&len); | |
1575 | rchan = packet_get_int(); | |
1576 | rwindow = packet_get_int(); | |
1577 | rmaxpack = packet_get_int(); | |
1578 | ||
1579 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", | |
1580 | ctype, rchan, rwindow, rmaxpack); | |
1581 | ||
1582 | if (strcmp(ctype, "forwarded-tcpip") == 0) { | |
1583 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1584 | } else if (strcmp(ctype, "x11") == 0) { | |
1585 | c = client_request_x11(ctype, rchan); | |
1586 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1587 | c = client_request_agent(ctype, rchan); | |
1588 | } | |
1589 | /* XXX duplicate : */ | |
1590 | if (c != NULL) { | |
1591 | debug("confirm %s", ctype); | |
1592 | c->remote_id = rchan; | |
1593 | c->remote_window = rwindow; | |
1594 | c->remote_maxpacket = rmaxpack; | |
1595 | if (c->type != SSH_CHANNEL_CONNECTING) { | |
1596 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1597 | packet_put_int(c->remote_id); | |
1598 | packet_put_int(c->self); | |
1599 | packet_put_int(c->local_window); | |
1600 | packet_put_int(c->local_maxpacket); | |
1601 | packet_send(); | |
1602 | } | |
1603 | } else { | |
1604 | debug("failure %s", ctype); | |
1605 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1606 | packet_put_int(rchan); | |
1607 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
1608 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1609 | packet_put_cstring("open failed"); | |
1610 | packet_put_cstring(""); | |
1611 | } | |
1612 | packet_send(); | |
1613 | } | |
1614 | xfree(ctype); | |
1615 | } | |
1616 | static void | |
1617 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) | |
1618 | { | |
1619 | Channel *c = NULL; | |
1620 | int exitval, id, reply, success = 0; | |
1621 | char *rtype; | |
1622 | ||
1623 | id = packet_get_int(); | |
1624 | rtype = packet_get_string(NULL); | |
1625 | reply = packet_get_char(); | |
1626 | ||
1627 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1628 | id, rtype, reply); | |
1629 | ||
1630 | if (id == -1) { | |
1631 | error("client_input_channel_req: request for channel -1"); | |
1632 | } else if ((c = channel_lookup(id)) == NULL) { | |
1633 | error("client_input_channel_req: channel %d: unknown channel", id); | |
1634 | } else if (strcmp(rtype, "exit-status") == 0) { | |
1635 | exitval = packet_get_int(); | |
1636 | if (id == session_ident) { | |
1637 | success = 1; | |
1638 | exit_status = exitval; | |
1639 | } else if (c->ctl_fd == -1) { | |
1640 | error("client_input_channel_req: unexpected channel %d", | |
1641 | session_ident); | |
1642 | } else { | |
1643 | atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval)); | |
1644 | success = 1; | |
1645 | } | |
1646 | packet_check_eom(); | |
1647 | } | |
1648 | if (reply) { | |
1649 | packet_start(success ? | |
1650 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1651 | packet_put_int(id); | |
1652 | packet_send(); | |
1653 | } | |
1654 | xfree(rtype); | |
1655 | } | |
1656 | static void | |
1657 | client_input_global_request(int type, u_int32_t seq, void *ctxt) | |
1658 | { | |
1659 | char *rtype; | |
1660 | int want_reply; | |
1661 | int success = 0; | |
1662 | ||
1663 | rtype = packet_get_string(NULL); | |
1664 | want_reply = packet_get_char(); | |
1665 | debug("client_input_global_request: rtype %s want_reply %d", | |
1666 | rtype, want_reply); | |
1667 | if (want_reply) { | |
1668 | packet_start(success ? | |
1669 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1670 | packet_send(); | |
1671 | packet_write_wait(); | |
1672 | } | |
1673 | xfree(rtype); | |
1674 | } | |
1675 | ||
1676 | void | |
1677 | client_session2_setup(int id, int want_tty, int want_subsystem, | |
1678 | const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env, | |
1679 | dispatch_fn *subsys_repl) | |
1680 | { | |
1681 | int len; | |
1682 | ||
1683 | debug2("%s: id %d", __func__, id); | |
1684 | ||
1685 | if (want_tty) { | |
1686 | struct winsize ws; | |
1687 | struct termios tio; | |
1688 | ||
1689 | /* Store window size in the packet. */ | |
1690 | if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) | |
1691 | memset(&ws, 0, sizeof(ws)); | |
1692 | ||
1693 | channel_request_start(id, "pty-req", 0); | |
1694 | packet_put_cstring(term != NULL ? term : ""); | |
1695 | packet_put_int(ws.ws_col); | |
1696 | packet_put_int(ws.ws_row); | |
1697 | packet_put_int(ws.ws_xpixel); | |
1698 | packet_put_int(ws.ws_ypixel); | |
1699 | tio = get_saved_tio(); | |
1700 | tty_make_modes(-1, tiop != NULL ? tiop : &tio); | |
1701 | packet_send(); | |
1702 | /* XXX wait for reply */ | |
1703 | } | |
1704 | ||
1705 | /* Transfer any environment variables from client to server */ | |
1706 | if (options.num_send_env != 0 && env != NULL) { | |
1707 | int i, j, matched; | |
1708 | char *name, *val; | |
1709 | ||
1710 | debug("Sending environment."); | |
1711 | for (i = 0; env[i] != NULL; i++) { | |
1712 | /* Split */ | |
1713 | name = xstrdup(env[i]); | |
1714 | if ((val = strchr(name, '=')) == NULL) { | |
1715 | free(name); | |
1716 | continue; | |
1717 | } | |
1718 | *val++ = '\0'; | |
1719 | ||
1720 | matched = 0; | |
1721 | for (j = 0; j < options.num_send_env; j++) { | |
1722 | if (match_pattern(name, options.send_env[j])) { | |
1723 | matched = 1; | |
1724 | break; | |
1725 | } | |
1726 | } | |
1727 | if (!matched) { | |
1728 | debug3("Ignored env %s", name); | |
1729 | free(name); | |
1730 | continue; | |
1731 | } | |
1732 | ||
1733 | debug("Sending env %s = %s", name, val); | |
1734 | channel_request_start(id, "env", 0); | |
1735 | packet_put_cstring(name); | |
1736 | packet_put_cstring(val); | |
1737 | packet_send(); | |
1738 | free(name); | |
1739 | } | |
1740 | } | |
1741 | ||
1742 | len = buffer_len(cmd); | |
1743 | if (len > 0) { | |
1744 | if (len > 900) | |
1745 | len = 900; | |
1746 | if (want_subsystem) { | |
1747 | debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1748 | channel_request_start(id, "subsystem", subsys_repl != NULL); | |
1749 | if (subsys_repl != NULL) { | |
1750 | /* register callback for reply */ | |
1751 | /* XXX we assume that client_loop has already been called */ | |
1752 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl); | |
1753 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl); | |
1754 | } | |
1755 | } else { | |
1756 | debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1757 | channel_request_start(id, "exec", 0); | |
1758 | } | |
1759 | packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); | |
1760 | packet_send(); | |
1761 | } else { | |
1762 | channel_request_start(id, "shell", 0); | |
1763 | packet_send(); | |
1764 | } | |
1765 | } | |
1766 | ||
1767 | static void | |
1768 | client_init_dispatch_20(void) | |
1769 | { | |
1770 | dispatch_init(&dispatch_protocol_error); | |
1771 | ||
1772 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); | |
1773 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1774 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1775 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
1776 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); | |
1777 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
1778 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1779 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); | |
1780 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); | |
1781 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); | |
1782 | ||
1783 | /* rekeying */ | |
1784 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
1785 | ||
1786 | /* global request reply messages */ | |
1787 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); | |
1788 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); | |
1789 | } | |
1790 | static void | |
1791 | client_init_dispatch_13(void) | |
1792 | { | |
1793 | dispatch_init(NULL); | |
1794 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1795 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1796 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
1797 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
1798 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1799 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
1800 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); | |
1801 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1802 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
1803 | ||
1804 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
1805 | &client_input_agent_open : &deny_input_open); | |
1806 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? | |
1807 | &x11_input_open : &deny_input_open); | |
1808 | } | |
1809 | static void | |
1810 | client_init_dispatch_15(void) | |
1811 | { | |
1812 | client_init_dispatch_13(); | |
1813 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1814 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1815 | } | |
1816 | static void | |
1817 | client_init_dispatch(void) | |
1818 | { | |
1819 | if (compat20) | |
1820 | client_init_dispatch_20(); | |
1821 | else if (compat13) | |
1822 | client_init_dispatch_13(); | |
1823 | else | |
1824 | client_init_dispatch_15(); | |
1825 | } | |
1826 | ||
1827 | /* client specific fatal cleanup */ | |
1828 | void | |
1829 | cleanup_exit(int i) | |
1830 | { | |
1831 | leave_raw_mode(); | |
1832 | leave_non_blocking(); | |
1833 | if (options.control_path != NULL && control_fd != -1) | |
1834 | unlink(options.control_path); | |
1835 | _exit(i); | |
1836 | } |