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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" | |
1d3e026f | 62 | RCSID("$OpenBSD: clientloop.c,v 1.150 2006/02/07 01:42:00 stevesk Exp $"); |
63 | ||
64 | #include <termios.h> | |
8efc0c15 | 65 | |
8efc0c15 | 66 | #include "ssh.h" |
42f11eb2 | 67 | #include "ssh1.h" |
68 | #include "ssh2.h" | |
69 | #include "xmalloc.h" | |
8efc0c15 | 70 | #include "packet.h" |
71 | #include "buffer.h" | |
7368a6c8 | 72 | #include "compat.h" |
a5efa1bb | 73 | #include "channels.h" |
7368a6c8 | 74 | #include "dispatch.h" |
2e73a022 | 75 | #include "buffer.h" |
76 | #include "bufaux.h" | |
fa08c86b | 77 | #include "key.h" |
e092ce67 | 78 | #include "kex.h" |
42f11eb2 | 79 | #include "log.h" |
80 | #include "readconf.h" | |
b5c334cc | 81 | #include "clientloop.h" |
ceec33f3 | 82 | #include "sshconnect.h" |
42f11eb2 | 83 | #include "authfd.h" |
84 | #include "atomicio.h" | |
07d80252 | 85 | #include "sshpty.h" |
e968270c | 86 | #include "misc.h" |
5e96b616 | 87 | #include "monitor_fdpass.h" |
88 | #include "match.h" | |
89 | #include "msg.h" | |
a22aff1f | 90 | |
91 | /* import options */ | |
92 | extern Options options; | |
93 | ||
8efc0c15 | 94 | /* Flag indicating that stdin should be redirected from /dev/null. */ |
95 | extern int stdin_null_flag; | |
96 | ||
66357af5 | 97 | /* Flag indicating that no shell has been requested */ |
98 | extern int no_shell_flag; | |
99 | ||
5e96b616 | 100 | /* Control socket */ |
101 | extern int control_fd; | |
102 | ||
aa3378df | 103 | /* |
104 | * Name of the host we are connecting to. This is the name given on the | |
105 | * command line, or the HostName specified for the user-supplied name in a | |
106 | * configuration file. | |
107 | */ | |
8efc0c15 | 108 | extern char *host; |
109 | ||
aa3378df | 110 | /* |
111 | * Flag to indicate that we have received a window change signal which has | |
112 | * not yet been processed. This will cause a message indicating the new | |
113 | * window size to be sent to the server a little later. This is volatile | |
114 | * because this is updated in a signal handler. | |
115 | */ | |
7a934d1b | 116 | static volatile sig_atomic_t received_window_change_signal = 0; |
117 | static volatile sig_atomic_t received_signal = 0; | |
8efc0c15 | 118 | |
7b9b0103 | 119 | /* Flag indicating whether the user's terminal is in non-blocking mode. */ |
8efc0c15 | 120 | static int in_non_blocking_mode = 0; |
121 | ||
122 | /* Common data for the client loop code. */ | |
2e73a022 | 123 | static int quit_pending; /* Set to non-zero to quit the client loop. */ |
124 | static int escape_char; /* Escape character. */ | |
5260325f | 125 | static int escape_pending; /* Last character was the escape character */ |
126 | static int last_was_cr; /* Last character was a newline. */ | |
127 | static int exit_status; /* Used to store the exit status of the command. */ | |
128 | static int stdin_eof; /* EOF has been encountered on standard error. */ | |
129 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
130 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
131 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
1e3b8b07 | 132 | static u_long stdin_bytes, stdout_bytes, stderr_bytes; |
133 | static u_int buffer_high;/* Soft max buffer size. */ | |
5260325f | 134 | static int connection_in; /* Connection to server (input). */ |
135 | static int connection_out; /* Connection to server (output). */ | |
c422989b | 136 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ |
eb0dd41f | 137 | static int session_closed = 0; /* In SSH2: login session closed. */ |
5d8d32a3 | 138 | static int server_alive_timeouts = 0; |
8efc0c15 | 139 | |
396c147e | 140 | static void client_init_dispatch(void); |
8ce64345 | 141 | int session_ident = -1; |
142 | ||
5e96b616 | 143 | struct confirm_ctx { |
144 | int want_tty; | |
145 | int want_subsys; | |
ef07103c | 146 | int want_x_fwd; |
147 | int want_agent_fwd; | |
5e96b616 | 148 | Buffer cmd; |
149 | char *term; | |
150 | struct termios tio; | |
1786be35 | 151 | char **env; |
5e96b616 | 152 | }; |
153 | ||
e092ce67 | 154 | /*XXX*/ |
155 | extern Kex *xxx_kex; | |
156 | ||
5e96b616 | 157 | void ssh_process_session2_setup(int, int, int, Buffer *); |
158 | ||
8efc0c15 | 159 | /* Restores stdin to blocking mode. */ |
160 | ||
396c147e | 161 | static void |
5ca51e19 | 162 | leave_non_blocking(void) |
8efc0c15 | 163 | { |
5260325f | 164 | if (in_non_blocking_mode) { |
1b273ece | 165 | unset_nonblock(fileno(stdin)); |
5260325f | 166 | in_non_blocking_mode = 0; |
5260325f | 167 | } |
8efc0c15 | 168 | } |
169 | ||
5260325f | 170 | /* Puts stdin terminal in non-blocking mode. */ |
171 | ||
396c147e | 172 | static void |
5ca51e19 | 173 | enter_non_blocking(void) |
8efc0c15 | 174 | { |
5260325f | 175 | in_non_blocking_mode = 1; |
170694d7 | 176 | set_nonblock(fileno(stdin)); |
8efc0c15 | 177 | } |
178 | ||
aa3378df | 179 | /* |
180 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
181 | * flag indicating that the window has changed. | |
182 | */ | |
8efc0c15 | 183 | |
396c147e | 184 | static void |
5260325f | 185 | window_change_handler(int sig) |
8efc0c15 | 186 | { |
5260325f | 187 | received_window_change_signal = 1; |
188 | signal(SIGWINCH, window_change_handler); | |
8efc0c15 | 189 | } |
190 | ||
aa3378df | 191 | /* |
192 | * Signal handler for signals that cause the program to terminate. These | |
193 | * signals must be trapped to restore terminal modes. | |
194 | */ | |
8efc0c15 | 195 | |
396c147e | 196 | static void |
5260325f | 197 | signal_handler(int sig) |
8efc0c15 | 198 | { |
c9130033 | 199 | received_signal = sig; |
200 | quit_pending = 1; | |
8efc0c15 | 201 | } |
202 | ||
aa3378df | 203 | /* |
204 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
205 | * available resolution. | |
206 | */ | |
8efc0c15 | 207 | |
396c147e | 208 | static double |
5ca51e19 | 209 | get_current_time(void) |
8efc0c15 | 210 | { |
5260325f | 211 | struct timeval tv; |
212 | gettimeofday(&tv, NULL); | |
213 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
8efc0c15 | 214 | } |
215 | ||
9bf083eb | 216 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
217 | void | |
218 | client_x11_get_proto(const char *display, const char *xauth_path, | |
219 | u_int trusted, char **_proto, char **_data) | |
220 | { | |
221 | char cmd[1024]; | |
222 | char line[512]; | |
223 | char xdisplay[512]; | |
224 | static char proto[512], data[512]; | |
225 | FILE *f; | |
226 | int got_data = 0, generated = 0, do_unlink = 0, i; | |
227 | char *xauthdir, *xauthfile; | |
228 | struct stat st; | |
229 | ||
230 | xauthdir = xauthfile = NULL; | |
231 | *_proto = proto; | |
232 | *_data = data; | |
233 | proto[0] = data[0] = '\0'; | |
234 | ||
235 | if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { | |
236 | debug("No xauth program."); | |
237 | } else { | |
238 | if (display == NULL) { | |
239 | debug("x11_get_proto: DISPLAY not set"); | |
240 | return; | |
241 | } | |
242 | /* | |
243 | * Handle FamilyLocal case where $DISPLAY does | |
244 | * not match an authorization entry. For this we | |
245 | * just try "xauth list unix:displaynum.screennum". | |
246 | * XXX: "localhost" match to determine FamilyLocal | |
247 | * is not perfect. | |
248 | */ | |
249 | if (strncmp(display, "localhost:", 10) == 0) { | |
250 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", | |
251 | display + 10); | |
252 | display = xdisplay; | |
253 | } | |
254 | if (trusted == 0) { | |
255 | xauthdir = xmalloc(MAXPATHLEN); | |
256 | xauthfile = xmalloc(MAXPATHLEN); | |
257 | strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); | |
258 | if (mkdtemp(xauthdir) != NULL) { | |
259 | do_unlink = 1; | |
260 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", | |
261 | xauthdir); | |
262 | snprintf(cmd, sizeof(cmd), | |
263 | "%s -f %s generate %s " SSH_X11_PROTO | |
264 | " untrusted timeout 1200 2>" _PATH_DEVNULL, | |
265 | xauth_path, xauthfile, display); | |
266 | debug2("x11_get_proto: %s", cmd); | |
267 | if (system(cmd) == 0) | |
268 | generated = 1; | |
269 | } | |
270 | } | |
271 | snprintf(cmd, sizeof(cmd), | |
b5443199 | 272 | "%s %s%s list %s 2>" _PATH_DEVNULL, |
9bf083eb | 273 | xauth_path, |
274 | generated ? "-f " : "" , | |
275 | generated ? xauthfile : "", | |
276 | display); | |
277 | debug2("x11_get_proto: %s", cmd); | |
278 | f = popen(cmd, "r"); | |
279 | if (f && fgets(line, sizeof(line), f) && | |
280 | sscanf(line, "%*s %511s %511s", proto, data) == 2) | |
281 | got_data = 1; | |
282 | if (f) | |
283 | pclose(f); | |
284 | } | |
285 | ||
286 | if (do_unlink) { | |
287 | unlink(xauthfile); | |
288 | rmdir(xauthdir); | |
289 | } | |
290 | if (xauthdir) | |
291 | xfree(xauthdir); | |
292 | if (xauthfile) | |
293 | xfree(xauthfile); | |
294 | ||
295 | /* | |
296 | * If we didn't get authentication data, just make up some | |
297 | * data. The forwarding code will check the validity of the | |
298 | * response anyway, and substitute this data. The X11 | |
299 | * server, however, will ignore this fake data and use | |
300 | * whatever authentication mechanisms it was using otherwise | |
301 | * for the local connection. | |
302 | */ | |
303 | if (!got_data) { | |
304 | u_int32_t rnd = 0; | |
305 | ||
306 | logit("Warning: No xauth data; " | |
307 | "using fake authentication data for X11 forwarding."); | |
308 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); | |
309 | for (i = 0; i < 16; i++) { | |
310 | if (i % 4 == 0) | |
311 | rnd = arc4random(); | |
312 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", | |
313 | rnd & 0xff); | |
314 | rnd >>= 8; | |
315 | } | |
316 | } | |
317 | } | |
318 | ||
aa3378df | 319 | /* |
320 | * This is called when the interactive is entered. This checks if there is | |
321 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
322 | * not appear to wake up when redirecting from /dev/null. | |
323 | */ | |
8efc0c15 | 324 | |
396c147e | 325 | static void |
5ca51e19 | 326 | client_check_initial_eof_on_stdin(void) |
8efc0c15 | 327 | { |
5260325f | 328 | int len; |
329 | char buf[1]; | |
330 | ||
aa3378df | 331 | /* |
332 | * If standard input is to be "redirected from /dev/null", we simply | |
333 | * mark that we have seen an EOF and send an EOF message to the | |
334 | * server. Otherwise, we try to read a single character; it appears | |
335 | * that for some files, such /dev/null, select() never wakes up for | |
336 | * read for this descriptor, which means that we never get EOF. This | |
337 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
338 | */ | |
5260325f | 339 | if (stdin_null_flag) { |
340 | /* Fake EOF on stdin. */ | |
341 | debug("Sending eof."); | |
342 | stdin_eof = 1; | |
343 | packet_start(SSH_CMSG_EOF); | |
344 | packet_send(); | |
345 | } else { | |
5260325f | 346 | enter_non_blocking(); |
347 | ||
348 | /* Check for immediate EOF on stdin. */ | |
349 | len = read(fileno(stdin), buf, 1); | |
350 | if (len == 0) { | |
aa3378df | 351 | /* EOF. Record that we have seen it and send EOF to server. */ |
5260325f | 352 | debug("Sending eof."); |
353 | stdin_eof = 1; | |
354 | packet_start(SSH_CMSG_EOF); | |
355 | packet_send(); | |
356 | } else if (len > 0) { | |
aa3378df | 357 | /* |
358 | * Got data. We must store the data in the buffer, | |
359 | * and also process it as an escape character if | |
360 | * appropriate. | |
361 | */ | |
1e3b8b07 | 362 | if ((u_char) buf[0] == escape_char) |
5260325f | 363 | escape_pending = 1; |
7e8911cd | 364 | else |
5260325f | 365 | buffer_append(&stdin_buffer, buf, 1); |
5260325f | 366 | } |
5260325f | 367 | leave_non_blocking(); |
8efc0c15 | 368 | } |
8efc0c15 | 369 | } |
370 | ||
8efc0c15 | 371 | |
aa3378df | 372 | /* |
373 | * Make packets from buffered stdin data, and buffer them for sending to the | |
374 | * connection. | |
375 | */ | |
8efc0c15 | 376 | |
396c147e | 377 | static void |
5ca51e19 | 378 | client_make_packets_from_stdin_data(void) |
8efc0c15 | 379 | { |
1e3b8b07 | 380 | u_int len; |
5260325f | 381 | |
382 | /* Send buffered stdin data to the server. */ | |
383 | while (buffer_len(&stdin_buffer) > 0 && | |
184eed6a | 384 | packet_not_very_much_data_to_write()) { |
5260325f | 385 | len = buffer_len(&stdin_buffer); |
386 | /* Keep the packets at reasonable size. */ | |
387 | if (len > packet_get_maxsize()) | |
388 | len = packet_get_maxsize(); | |
389 | packet_start(SSH_CMSG_STDIN_DATA); | |
390 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
391 | packet_send(); | |
392 | buffer_consume(&stdin_buffer, len); | |
7e8911cd | 393 | stdin_bytes += len; |
5260325f | 394 | /* If we have a pending EOF, send it now. */ |
395 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
396 | packet_start(SSH_CMSG_EOF); | |
397 | packet_send(); | |
398 | } | |
8efc0c15 | 399 | } |
8efc0c15 | 400 | } |
401 | ||
aa3378df | 402 | /* |
403 | * Checks if the client window has changed, and sends a packet about it to | |
404 | * the server if so. The actual change is detected elsewhere (by a software | |
405 | * interrupt on Unix); this just checks the flag and sends a message if | |
406 | * appropriate. | |
407 | */ | |
8efc0c15 | 408 | |
396c147e | 409 | static void |
5ca51e19 | 410 | client_check_window_change(void) |
8efc0c15 | 411 | { |
8ce64345 | 412 | struct winsize ws; |
413 | ||
414 | if (! received_window_change_signal) | |
415 | return; | |
416 | /** XXX race */ | |
417 | received_window_change_signal = 0; | |
418 | ||
de273eef | 419 | debug2("client_check_window_change: changed"); |
8ce64345 | 420 | |
421 | if (compat20) { | |
5e96b616 | 422 | channel_send_window_changes(); |
8ce64345 | 423 | } else { |
5e96b616 | 424 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
425 | return; | |
8ce64345 | 426 | packet_start(SSH_CMSG_WINDOW_SIZE); |
427 | packet_put_int(ws.ws_row); | |
428 | packet_put_int(ws.ws_col); | |
429 | packet_put_int(ws.ws_xpixel); | |
430 | packet_put_int(ws.ws_ypixel); | |
431 | packet_send(); | |
8efc0c15 | 432 | } |
8efc0c15 | 433 | } |
434 | ||
5d8d32a3 | 435 | static void |
436 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
437 | { | |
438 | server_alive_timeouts = 0; | |
439 | client_global_request_reply_fwd(type, seq, ctxt); | |
440 | } | |
441 | ||
442 | static void | |
443 | server_alive_check(void) | |
444 | { | |
445 | if (++server_alive_timeouts > options.server_alive_count_max) | |
446 | packet_disconnect("Timeout, server not responding."); | |
447 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
448 | packet_put_cstring("keepalive@openssh.com"); | |
449 | packet_put_char(1); /* boolean: want reply */ | |
450 | packet_send(); | |
451 | } | |
452 | ||
aa3378df | 453 | /* |
454 | * Waits until the client can do something (some data becomes available on | |
455 | * one of the file descriptors). | |
456 | */ | |
396c147e | 457 | static void |
39929cdb | 458 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
9a995072 | 459 | int *maxfdp, u_int *nallocp, int rekeying) |
8efc0c15 | 460 | { |
5d8d32a3 | 461 | struct timeval tv, *tvp; |
462 | int ret; | |
463 | ||
39929cdb | 464 | /* Add any selections by the channel mechanism. */ |
489aa2e9 | 465 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); |
5260325f | 466 | |
8ce64345 | 467 | if (!compat20) { |
468 | /* Read from the connection, unless our buffers are full. */ | |
469 | if (buffer_len(&stdout_buffer) < buffer_high && | |
470 | buffer_len(&stderr_buffer) < buffer_high && | |
471 | channel_not_very_much_buffered_data()) | |
39929cdb | 472 | FD_SET(connection_in, *readsetp); |
8ce64345 | 473 | /* |
474 | * Read from stdin, unless we have seen EOF or have very much | |
475 | * buffered data to send to the server. | |
476 | */ | |
477 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
39929cdb | 478 | FD_SET(fileno(stdin), *readsetp); |
8ce64345 | 479 | |
480 | /* Select stdout/stderr if have data in buffer. */ | |
481 | if (buffer_len(&stdout_buffer) > 0) | |
39929cdb | 482 | FD_SET(fileno(stdout), *writesetp); |
8ce64345 | 483 | if (buffer_len(&stderr_buffer) > 0) |
39929cdb | 484 | FD_SET(fileno(stderr), *writesetp); |
8ce64345 | 485 | } else { |
24b6b45f | 486 | /* channel_prepare_select could have closed the last channel */ |
fd6cfbaf | 487 | if (session_closed && !channel_still_open() && |
488 | !packet_have_data_to_write()) { | |
489 | /* clear mask since we did not call select() */ | |
b3ad8fe6 | 490 | memset(*readsetp, 0, *nallocp); |
491 | memset(*writesetp, 0, *nallocp); | |
fd6cfbaf | 492 | return; |
24b6b45f | 493 | } else { |
494 | FD_SET(connection_in, *readsetp); | |
495 | } | |
8ce64345 | 496 | } |
5260325f | 497 | |
5260325f | 498 | /* Select server connection if have data to write to the server. */ |
499 | if (packet_have_data_to_write()) | |
39929cdb | 500 | FD_SET(connection_out, *writesetp); |
5260325f | 501 | |
5e96b616 | 502 | if (control_fd != -1) |
503 | FD_SET(control_fd, *readsetp); | |
504 | ||
aa3378df | 505 | /* |
506 | * Wait for something to happen. This will suspend the process until | |
507 | * some selected descriptor can be read, written, or has some other | |
5d8d32a3 | 508 | * event pending. |
aa3378df | 509 | */ |
5260325f | 510 | |
5d8d32a3 | 511 | if (options.server_alive_interval == 0 || !compat20) |
512 | tvp = NULL; | |
f2107e97 | 513 | else { |
5d8d32a3 | 514 | tv.tv_sec = options.server_alive_interval; |
515 | tv.tv_usec = 0; | |
516 | tvp = &tv; | |
517 | } | |
518 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); | |
519 | if (ret < 0) { | |
5260325f | 520 | char buf[100]; |
fd193ca4 | 521 | |
522 | /* | |
523 | * We have to clear the select masks, because we return. | |
524 | * We have to return, because the mainloop checks for the flags | |
525 | * set by the signal handlers. | |
526 | */ | |
b3ad8fe6 | 527 | memset(*readsetp, 0, *nallocp); |
528 | memset(*writesetp, 0, *nallocp); | |
fd193ca4 | 529 | |
5260325f | 530 | if (errno == EINTR) |
531 | return; | |
532 | /* Note: we might still have data in the buffers. */ | |
533 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
534 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 535 | quit_pending = 1; |
5d8d32a3 | 536 | } else if (ret == 0) |
537 | server_alive_check(); | |
8efc0c15 | 538 | } |
539 | ||
396c147e | 540 | static void |
2e73a022 | 541 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
8efc0c15 | 542 | { |
5260325f | 543 | /* Flush stdout and stderr buffers. */ |
2e73a022 | 544 | if (buffer_len(bout) > 0) |
dc54438a | 545 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); |
2e73a022 | 546 | if (buffer_len(berr) > 0) |
dc54438a | 547 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); |
5260325f | 548 | |
5260325f | 549 | leave_raw_mode(); |
550 | ||
aa3378df | 551 | /* |
552 | * Free (and clear) the buffer to reduce the amount of data that gets | |
553 | * written to swap. | |
554 | */ | |
2e73a022 | 555 | buffer_free(bin); |
556 | buffer_free(bout); | |
557 | buffer_free(berr); | |
5260325f | 558 | |
5260325f | 559 | /* Send the suspend signal to the program itself. */ |
560 | kill(getpid(), SIGTSTP); | |
561 | ||
2c9a4d41 | 562 | /* Reset window sizes in case they have changed */ |
563 | received_window_change_signal = 1; | |
5260325f | 564 | |
565 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
2e73a022 | 566 | buffer_init(bin); |
567 | buffer_init(bout); | |
568 | buffer_init(berr); | |
5260325f | 569 | |
5260325f | 570 | enter_raw_mode(); |
8efc0c15 | 571 | } |
572 | ||
396c147e | 573 | static void |
8ce64345 | 574 | client_process_net_input(fd_set * readset) |
8efc0c15 | 575 | { |
8ce64345 | 576 | int len; |
577 | char buf[8192]; | |
5260325f | 578 | |
aa3378df | 579 | /* |
580 | * Read input from the server, and add any such data to the buffer of | |
581 | * the packet subsystem. | |
582 | */ | |
5260325f | 583 | if (FD_ISSET(connection_in, readset)) { |
584 | /* Read as much as possible. */ | |
585 | len = read(connection_in, buf, sizeof(buf)); | |
586 | if (len == 0) { | |
587 | /* Received EOF. The remote host has closed the connection. */ | |
588 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
589 | host); | |
8efc0c15 | 590 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
8efc0c15 | 591 | quit_pending = 1; |
592 | return; | |
5260325f | 593 | } |
aa3378df | 594 | /* |
595 | * There is a kernel bug on Solaris that causes select to | |
596 | * sometimes wake up even though there is no data available. | |
597 | */ | |
09cb311c | 598 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
5260325f | 599 | len = 0; |
600 | ||
601 | if (len < 0) { | |
602 | /* An error has encountered. Perhaps there is a network problem. */ | |
603 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
604 | host, strerror(errno)); | |
605 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 606 | quit_pending = 1; |
607 | return; | |
608 | } | |
609 | packet_process_incoming(buf, len); | |
610 | } | |
8ce64345 | 611 | } |
612 | ||
5e96b616 | 613 | static void |
614 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) | |
615 | { | |
616 | int id; | |
617 | Channel *c; | |
f2107e97 | 618 | |
5e96b616 | 619 | id = packet_get_int(); |
620 | packet_check_eom(); | |
621 | ||
622 | if ((c = channel_lookup(id)) == NULL) { | |
623 | error("%s: no channel for id %d", __func__, id); | |
624 | return; | |
625 | } | |
626 | ||
627 | if (type == SSH2_MSG_CHANNEL_SUCCESS) | |
628 | debug2("Request suceeded on channel %d", id); | |
629 | else if (type == SSH2_MSG_CHANNEL_FAILURE) { | |
630 | error("Request failed on channel %d", id); | |
631 | channel_free(c); | |
632 | } | |
633 | } | |
634 | ||
635 | static void | |
636 | client_extra_session2_setup(int id, void *arg) | |
637 | { | |
638 | struct confirm_ctx *cctx = arg; | |
ef07103c | 639 | const char *display; |
5e96b616 | 640 | Channel *c; |
1786be35 | 641 | int i; |
f2107e97 | 642 | |
5e96b616 | 643 | if (cctx == NULL) |
644 | fatal("%s: cctx == NULL", __func__); | |
645 | if ((c = channel_lookup(id)) == NULL) | |
646 | fatal("%s: no channel for id %d", __func__, id); | |
647 | ||
56964485 | 648 | display = getenv("DISPLAY"); |
ef07103c | 649 | if (cctx->want_x_fwd && options.forward_x11 && display != NULL) { |
650 | char *proto, *data; | |
651 | /* Get reasonable local authentication information. */ | |
652 | client_x11_get_proto(display, options.xauth_location, | |
653 | options.forward_x11_trusted, &proto, &data); | |
654 | /* Request forwarding with authentication spoofing. */ | |
655 | debug("Requesting X11 forwarding with authentication spoofing."); | |
656 | x11_request_forwarding_with_spoofing(id, display, proto, data); | |
657 | /* XXX wait for reply */ | |
658 | } | |
659 | ||
660 | if (cctx->want_agent_fwd && options.forward_agent) { | |
661 | debug("Requesting authentication agent forwarding."); | |
662 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
663 | packet_send(); | |
664 | } | |
665 | ||
f2107e97 | 666 | client_session2_setup(id, cctx->want_tty, cctx->want_subsys, |
1786be35 | 667 | cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env, |
5e96b616 | 668 | client_subsystem_reply); |
0d34d6ce | 669 | |
5e96b616 | 670 | c->confirm_ctx = NULL; |
671 | buffer_free(&cctx->cmd); | |
1786be35 | 672 | xfree(cctx->term); |
673 | if (cctx->env != NULL) { | |
674 | for (i = 0; cctx->env[i] != NULL; i++) | |
675 | xfree(cctx->env[i]); | |
676 | xfree(cctx->env); | |
f2107e97 | 677 | } |
1786be35 | 678 | xfree(cctx); |
5e96b616 | 679 | } |
680 | ||
681 | static void | |
682 | client_process_control(fd_set * readset) | |
683 | { | |
684 | Buffer m; | |
685 | Channel *c; | |
2ceb8101 | 686 | int client_fd, new_fd[3], ver, allowed; |
5e96b616 | 687 | socklen_t addrlen; |
688 | struct sockaddr_storage addr; | |
689 | struct confirm_ctx *cctx; | |
690 | char *cmd; | |
2ceb8101 | 691 | u_int i, len, env_len, command, flags; |
5e96b616 | 692 | uid_t euid; |
693 | gid_t egid; | |
694 | ||
695 | /* | |
696 | * Accept connection on control socket | |
697 | */ | |
698 | if (control_fd == -1 || !FD_ISSET(control_fd, readset)) | |
699 | return; | |
700 | ||
701 | memset(&addr, 0, sizeof(addr)); | |
702 | addrlen = sizeof(addr); | |
703 | if ((client_fd = accept(control_fd, | |
704 | (struct sockaddr*)&addr, &addrlen)) == -1) { | |
705 | error("%s accept: %s", __func__, strerror(errno)); | |
706 | return; | |
707 | } | |
708 | ||
709 | if (getpeereid(client_fd, &euid, &egid) < 0) { | |
710 | error("%s getpeereid failed: %s", __func__, strerror(errno)); | |
711 | close(client_fd); | |
712 | return; | |
713 | } | |
714 | if ((euid != 0) && (getuid() != euid)) { | |
715 | error("control mode uid mismatch: peer euid %u != uid %u", | |
716 | (u_int) euid, (u_int) getuid()); | |
717 | close(client_fd); | |
718 | return; | |
719 | } | |
0d34d6ce | 720 | |
5e96b616 | 721 | unset_nonblock(client_fd); |
722 | ||
f8c6db83 | 723 | /* Read command */ |
5e96b616 | 724 | buffer_init(&m); |
f8c6db83 | 725 | if (ssh_msg_recv(client_fd, &m) == -1) { |
726 | error("%s: client msg_recv failed", __func__); | |
727 | close(client_fd); | |
728 | buffer_free(&m); | |
729 | return; | |
730 | } | |
ef07103c | 731 | if ((ver = buffer_get_char(&m)) != SSHMUX_VER) { |
f8c6db83 | 732 | error("%s: wrong client version %d", __func__, ver); |
733 | buffer_free(&m); | |
734 | close(client_fd); | |
735 | return; | |
736 | } | |
737 | ||
738 | allowed = 1; | |
739 | command = buffer_get_int(&m); | |
740 | flags = buffer_get_int(&m); | |
741 | ||
742 | buffer_clear(&m); | |
5e96b616 | 743 | |
f8c6db83 | 744 | switch (command) { |
745 | case SSHMUX_COMMAND_OPEN: | |
9dfd96d6 | 746 | if (options.control_master == SSHCTL_MASTER_ASK || |
747 | options.control_master == SSHCTL_MASTER_AUTO_ASK) | |
f8c6db83 | 748 | allowed = ask_permission("Allow shared connection " |
749 | "to %s? ", host); | |
750 | /* continue below */ | |
751 | break; | |
752 | case SSHMUX_COMMAND_TERMINATE: | |
9dfd96d6 | 753 | if (options.control_master == SSHCTL_MASTER_ASK || |
754 | options.control_master == SSHCTL_MASTER_AUTO_ASK) | |
f8c6db83 | 755 | allowed = ask_permission("Terminate shared connection " |
756 | "to %s? ", host); | |
757 | if (allowed) | |
758 | quit_pending = 1; | |
f8cc7664 | 759 | /* FALLTHROUGH */ |
f8c6db83 | 760 | case SSHMUX_COMMAND_ALIVE_CHECK: |
761 | /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */ | |
762 | buffer_clear(&m); | |
763 | buffer_put_int(&m, allowed); | |
764 | buffer_put_int(&m, getpid()); | |
ef07103c | 765 | if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { |
f8c6db83 | 766 | error("%s: client msg_send failed", __func__); |
767 | close(client_fd); | |
768 | buffer_free(&m); | |
769 | return; | |
770 | } | |
771 | buffer_free(&m); | |
772 | close(client_fd); | |
773 | return; | |
774 | default: | |
775 | error("Unsupported command %d", command); | |
776 | buffer_free(&m); | |
777 | close(client_fd); | |
778 | return; | |
779 | } | |
780 | ||
781 | /* Reply for SSHMUX_COMMAND_OPEN */ | |
782 | buffer_clear(&m); | |
0d34d6ce | 783 | buffer_put_int(&m, allowed); |
5e96b616 | 784 | buffer_put_int(&m, getpid()); |
ef07103c | 785 | if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { |
5e96b616 | 786 | error("%s: client msg_send failed", __func__); |
787 | close(client_fd); | |
0d34d6ce | 788 | buffer_free(&m); |
5e96b616 | 789 | return; |
790 | } | |
5e96b616 | 791 | |
0d34d6ce | 792 | if (!allowed) { |
793 | error("Refused control connection"); | |
794 | close(client_fd); | |
795 | buffer_free(&m); | |
796 | return; | |
797 | } | |
798 | ||
f8c6db83 | 799 | buffer_clear(&m); |
5e96b616 | 800 | if (ssh_msg_recv(client_fd, &m) == -1) { |
801 | error("%s: client msg_recv failed", __func__); | |
802 | close(client_fd); | |
0d34d6ce | 803 | buffer_free(&m); |
5e96b616 | 804 | return; |
805 | } | |
ef07103c | 806 | if ((ver = buffer_get_char(&m)) != SSHMUX_VER) { |
5e96b616 | 807 | error("%s: wrong client version %d", __func__, ver); |
808 | buffer_free(&m); | |
809 | close(client_fd); | |
810 | return; | |
811 | } | |
812 | ||
813 | cctx = xmalloc(sizeof(*cctx)); | |
814 | memset(cctx, 0, sizeof(*cctx)); | |
f8c6db83 | 815 | cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0; |
816 | cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0; | |
ef07103c | 817 | cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0; |
818 | cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0; | |
5e96b616 | 819 | cctx->term = buffer_get_string(&m, &len); |
820 | ||
821 | cmd = buffer_get_string(&m, &len); | |
822 | buffer_init(&cctx->cmd); | |
823 | buffer_append(&cctx->cmd, cmd, strlen(cmd)); | |
824 | ||
1786be35 | 825 | env_len = buffer_get_int(&m); |
826 | env_len = MIN(env_len, 4096); | |
827 | debug3("%s: receiving %d env vars", __func__, env_len); | |
828 | if (env_len != 0) { | |
829 | cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1)); | |
830 | for (i = 0; i < env_len; i++) | |
831 | cctx->env[i] = buffer_get_string(&m, &len); | |
832 | cctx->env[i] = NULL; | |
833 | } | |
834 | ||
5e96b616 | 835 | debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__, |
836 | cctx->want_tty, cctx->want_subsys, cmd); | |
837 | ||
838 | /* Gather fds from client */ | |
839 | new_fd[0] = mm_receive_fd(client_fd); | |
840 | new_fd[1] = mm_receive_fd(client_fd); | |
841 | new_fd[2] = mm_receive_fd(client_fd); | |
842 | ||
843 | debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__, | |
844 | new_fd[0], new_fd[1], new_fd[2]); | |
845 | ||
846 | /* Try to pick up ttymodes from client before it goes raw */ | |
847 | if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1) | |
848 | error("%s: tcgetattr: %s", __func__, strerror(errno)); | |
849 | ||
f8c6db83 | 850 | /* This roundtrip is just for synchronisation of ttymodes */ |
5e96b616 | 851 | buffer_clear(&m); |
ef07103c | 852 | if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { |
5e96b616 | 853 | error("%s: client msg_send failed", __func__); |
854 | close(client_fd); | |
855 | close(new_fd[0]); | |
856 | close(new_fd[1]); | |
857 | close(new_fd[2]); | |
0d34d6ce | 858 | buffer_free(&m); |
f8c6db83 | 859 | xfree(cctx->term); |
860 | if (env_len != 0) { | |
861 | for (i = 0; i < env_len; i++) | |
862 | xfree(cctx->env[i]); | |
863 | xfree(cctx->env); | |
864 | } | |
5e96b616 | 865 | return; |
866 | } | |
867 | buffer_free(&m); | |
868 | ||
869 | /* enable nonblocking unless tty */ | |
870 | if (!isatty(new_fd[0])) | |
871 | set_nonblock(new_fd[0]); | |
872 | if (!isatty(new_fd[1])) | |
873 | set_nonblock(new_fd[1]); | |
874 | if (!isatty(new_fd[2])) | |
875 | set_nonblock(new_fd[2]); | |
876 | ||
877 | set_nonblock(client_fd); | |
878 | ||
f2107e97 | 879 | c = channel_new("session", SSH_CHANNEL_OPENING, |
5e96b616 | 880 | new_fd[0], new_fd[1], new_fd[2], |
881 | CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT, | |
882 | CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0); | |
883 | ||
884 | /* XXX */ | |
885 | c->ctl_fd = client_fd; | |
886 | ||
887 | debug3("%s: channel_new: %d", __func__, c->self); | |
888 | ||
889 | channel_send_open(c->self); | |
890 | channel_register_confirm(c->self, client_extra_session2_setup, cctx); | |
891 | } | |
892 | ||
c53c54c2 | 893 | static void |
ec9b7086 | 894 | process_cmdline(void) |
c53c54c2 | 895 | { |
c53c54c2 | 896 | void (*handler)(int); |
3867aa0a | 897 | char *s, *cmd, *cancel_host; |
d740ec16 | 898 | int delete = 0; |
c53c54c2 | 899 | int local = 0; |
3867aa0a | 900 | u_short cancel_port; |
901 | Forward fwd; | |
c53c54c2 | 902 | |
903 | leave_raw_mode(); | |
875ec275 | 904 | handler = signal(SIGINT, SIG_IGN); |
ec9b7086 | 905 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
c53c54c2 | 906 | if (s == NULL) |
907 | goto out; | |
c53c54c2 | 908 | while (*s && isspace(*s)) |
909 | s++; | |
d740ec16 | 910 | if (*s == '-') |
911 | s++; /* Skip cmdline '-', if any */ | |
27c6fcae | 912 | if (*s == '\0') |
c53c54c2 | 913 | goto out; |
d740ec16 | 914 | |
7069a5e2 | 915 | if (*s == 'h' || *s == 'H' || *s == '?') { |
d740ec16 | 916 | logit("Commands:"); |
917 | logit(" -Lport:host:hostport Request local forward"); | |
918 | logit(" -Rport:host:hostport Request remote forward"); | |
919 | logit(" -KRhostport Cancel remote forward"); | |
d20f3c9e | 920 | if (!options.permit_local_command) |
921 | goto out; | |
922 | logit(" !args Execute local command"); | |
923 | goto out; | |
924 | } | |
925 | ||
926 | if (*s == '!' && options.permit_local_command) { | |
927 | s++; | |
928 | ssh_local_cmd(s); | |
d740ec16 | 929 | goto out; |
930 | } | |
931 | ||
932 | if (*s == 'K') { | |
933 | delete = 1; | |
934 | s++; | |
935 | } | |
936 | if (*s != 'L' && *s != 'R') { | |
bbe88b6d | 937 | logit("Invalid command."); |
c53c54c2 | 938 | goto out; |
939 | } | |
d740ec16 | 940 | if (*s == 'L') |
c53c54c2 | 941 | local = 1; |
d740ec16 | 942 | if (local && delete) { |
943 | logit("Not supported."); | |
944 | goto out; | |
945 | } | |
946 | if ((!local || delete) && !compat20) { | |
bbe88b6d | 947 | logit("Not supported for SSH protocol version 1."); |
c53c54c2 | 948 | goto out; |
949 | } | |
d740ec16 | 950 | |
951 | s++; | |
c53c54c2 | 952 | while (*s && isspace(*s)) |
953 | s++; | |
954 | ||
d740ec16 | 955 | if (delete) { |
3867aa0a | 956 | cancel_port = 0; |
957 | cancel_host = hpdelim(&s); /* may be NULL */ | |
958 | if (s != NULL) { | |
959 | cancel_port = a2port(s); | |
960 | cancel_host = cleanhostname(cancel_host); | |
961 | } else { | |
962 | cancel_port = a2port(cancel_host); | |
963 | cancel_host = NULL; | |
d740ec16 | 964 | } |
3867aa0a | 965 | if (cancel_port == 0) { |
966 | logit("Bad forwarding close port"); | |
c53c54c2 | 967 | goto out; |
968 | } | |
3867aa0a | 969 | channel_request_rforward_cancel(cancel_host, cancel_port); |
d740ec16 | 970 | } else { |
3867aa0a | 971 | if (!parse_forward(&fwd, s)) { |
d740ec16 | 972 | logit("Bad forwarding specification."); |
973 | goto out; | |
974 | } | |
d740ec16 | 975 | if (local) { |
3867aa0a | 976 | if (channel_setup_local_fwd_listener(fwd.listen_host, |
977 | fwd.listen_port, fwd.connect_host, | |
978 | fwd.connect_port, options.gateway_ports) < 0) { | |
d740ec16 | 979 | logit("Port forwarding failed."); |
980 | goto out; | |
981 | } | |
3867aa0a | 982 | } else { |
983 | channel_request_remote_forwarding(fwd.listen_host, | |
984 | fwd.listen_port, fwd.connect_host, | |
985 | fwd.connect_port); | |
986 | } | |
987 | ||
d740ec16 | 988 | logit("Forwarding port."); |
989 | } | |
990 | ||
c53c54c2 | 991 | out: |
992 | signal(SIGINT, handler); | |
993 | enter_raw_mode(); | |
994 | if (cmd) | |
995 | xfree(cmd); | |
996 | } | |
997 | ||
2e73a022 | 998 | /* process the characters one by one */ |
396c147e | 999 | static int |
2e73a022 | 1000 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) |
1001 | { | |
1002 | char string[1024]; | |
1003 | pid_t pid; | |
1004 | int bytes = 0; | |
1e3b8b07 | 1005 | u_int i; |
1006 | u_char ch; | |
2e73a022 | 1007 | char *s; |
1008 | ||
2ceb8101 | 1009 | if (len <= 0) |
1010 | return (0); | |
1011 | ||
1012 | for (i = 0; i < (u_int)len; i++) { | |
2e73a022 | 1013 | /* Get one character at a time. */ |
1014 | ch = buf[i]; | |
1015 | ||
1016 | if (escape_pending) { | |
1017 | /* We have previously seen an escape character. */ | |
1018 | /* Clear the flag now. */ | |
1019 | escape_pending = 0; | |
1020 | ||
1021 | /* Process the escaped character. */ | |
1022 | switch (ch) { | |
1023 | case '.': | |
1024 | /* Terminate the connection. */ | |
1025 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
1026 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 1027 | |
1028 | quit_pending = 1; | |
1029 | return -1; | |
1030 | ||
1031 | case 'Z' - 64: | |
1032 | /* Suspend the program. */ | |
1033 | /* Print a message to that effect to the user. */ | |
1034 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
1035 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 1036 | |
1037 | /* Restore terminal modes and suspend. */ | |
1038 | client_suspend_self(bin, bout, berr); | |
1039 | ||
1040 | /* We have been continued. */ | |
1041 | continue; | |
1042 | ||
16a79097 | 1043 | case 'B': |
1044 | if (compat20) { | |
1045 | snprintf(string, sizeof string, | |
1046 | "%cB\r\n", escape_char); | |
1047 | buffer_append(berr, string, | |
1048 | strlen(string)); | |
1049 | channel_request_start(session_ident, | |
1050 | "break", 0); | |
1051 | packet_put_int(1000); | |
1052 | packet_send(); | |
1053 | } | |
1054 | continue; | |
1055 | ||
e092ce67 | 1056 | case 'R': |
54506d2e | 1057 | if (compat20) { |
1058 | if (datafellows & SSH_BUG_NOREKEY) | |
bbe88b6d | 1059 | logit("Server does not support re-keying"); |
54506d2e | 1060 | else |
1061 | need_rekeying = 1; | |
1062 | } | |
e092ce67 | 1063 | continue; |
1064 | ||
2e73a022 | 1065 | case '&': |
2e73a022 | 1066 | /* |
1067 | * Detach the program (continue to serve connections, | |
1068 | * but put in background and no more new connections). | |
1069 | */ | |
2e73a022 | 1070 | /* Restore tty modes. */ |
1071 | leave_raw_mode(); | |
1072 | ||
1073 | /* Stop listening for new connections. */ | |
c6940381 | 1074 | channel_stop_listening(); |
2e73a022 | 1075 | |
c6940381 | 1076 | snprintf(string, sizeof string, |
1077 | "%c& [backgrounded]\n", escape_char); | |
1078 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 1079 | |
1080 | /* Fork into background. */ | |
1081 | pid = fork(); | |
1082 | if (pid < 0) { | |
1083 | error("fork: %.100s", strerror(errno)); | |
1084 | continue; | |
1085 | } | |
1086 | if (pid != 0) { /* This is the parent. */ | |
1087 | /* The parent just exits. */ | |
1088 | exit(0); | |
1089 | } | |
1090 | /* The child continues serving connections. */ | |
c6940381 | 1091 | if (compat20) { |
1092 | buffer_append(bin, "\004", 1); | |
1093 | /* fake EOF on stdin */ | |
1094 | return -1; | |
1095 | } else if (!stdin_eof) { | |
1096 | /* | |
1097 | * Sending SSH_CMSG_EOF alone does not always appear | |
1098 | * to be enough. So we try to send an EOF character | |
1099 | * first. | |
1100 | */ | |
1101 | packet_start(SSH_CMSG_STDIN_DATA); | |
1102 | packet_put_string("\004", 1); | |
1103 | packet_send(); | |
1104 | /* Close stdin. */ | |
1105 | stdin_eof = 1; | |
1106 | if (buffer_len(bin) == 0) { | |
1107 | packet_start(SSH_CMSG_EOF); | |
1108 | packet_send(); | |
1109 | } | |
1110 | } | |
1111 | continue; | |
2e73a022 | 1112 | |
1113 | case '?': | |
1114 | snprintf(string, sizeof string, | |
1115 | "%c?\r\n\ | |
1116 | Supported escape sequences:\r\n\ | |
1d77f8cb | 1117 | %c. - terminate connection\r\n\ |
16a79097 | 1118 | %cB - send a BREAK to the remote system\r\n\ |
1d77f8cb | 1119 | %cC - open a command line\r\n\ |
1120 | %cR - Request rekey (SSH protocol 2 only)\r\n\ | |
1121 | %c^Z - suspend ssh\r\n\ | |
1122 | %c# - list forwarded connections\r\n\ | |
1123 | %c& - background ssh (when waiting for connections to terminate)\r\n\ | |
1124 | %c? - this message\r\n\ | |
1125 | %c%c - send the escape character by typing it twice\r\n\ | |
2e73a022 | 1126 | (Note that escapes are only recognized immediately after newline.)\r\n", |
1d77f8cb | 1127 | escape_char, escape_char, escape_char, escape_char, |
1128 | escape_char, escape_char, escape_char, escape_char, | |
16a79097 | 1129 | escape_char, escape_char, escape_char); |
2e73a022 | 1130 | buffer_append(berr, string, strlen(string)); |
1131 | continue; | |
1132 | ||
1133 | case '#': | |
1134 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
1135 | buffer_append(berr, string, strlen(string)); | |
1136 | s = channel_open_message(); | |
1137 | buffer_append(berr, s, strlen(s)); | |
1138 | xfree(s); | |
1139 | continue; | |
1140 | ||
c53c54c2 | 1141 | case 'C': |
ec9b7086 | 1142 | process_cmdline(); |
c53c54c2 | 1143 | continue; |
1144 | ||
2e73a022 | 1145 | default: |
1146 | if (ch != escape_char) { | |
1147 | buffer_put_char(bin, escape_char); | |
1148 | bytes++; | |
1149 | } | |
1150 | /* Escaped characters fall through here */ | |
1151 | break; | |
1152 | } | |
1153 | } else { | |
1154 | /* | |
1155 | * The previous character was not an escape char. Check if this | |
1156 | * is an escape. | |
1157 | */ | |
1158 | if (last_was_cr && ch == escape_char) { | |
1159 | /* It is. Set the flag and continue to next character. */ | |
1160 | escape_pending = 1; | |
1161 | continue; | |
1162 | } | |
1163 | } | |
1164 | ||
1165 | /* | |
1166 | * Normal character. Record whether it was a newline, | |
1167 | * and append it to the buffer. | |
1168 | */ | |
1169 | last_was_cr = (ch == '\r' || ch == '\n'); | |
1170 | buffer_put_char(bin, ch); | |
1171 | bytes++; | |
1172 | } | |
1173 | return bytes; | |
1174 | } | |
1175 | ||
396c147e | 1176 | static void |
8ce64345 | 1177 | client_process_input(fd_set * readset) |
1178 | { | |
9da5c3c9 | 1179 | int len; |
2e73a022 | 1180 | char buf[8192]; |
8ce64345 | 1181 | |
5260325f | 1182 | /* Read input from stdin. */ |
1183 | if (FD_ISSET(fileno(stdin), readset)) { | |
1184 | /* Read as much as possible. */ | |
1185 | len = read(fileno(stdin), buf, sizeof(buf)); | |
cf6bc93c | 1186 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
1187 | return; /* we'll try again later */ | |
5260325f | 1188 | if (len <= 0) { |
aa3378df | 1189 | /* |
1190 | * Received EOF or error. They are treated | |
1191 | * similarly, except that an error message is printed | |
1192 | * if it was an error condition. | |
1193 | */ | |
5260325f | 1194 | if (len < 0) { |
1195 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
1196 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 1197 | } |
1198 | /* Mark that we have seen EOF. */ | |
1199 | stdin_eof = 1; | |
aa3378df | 1200 | /* |
1201 | * Send an EOF message to the server unless there is | |
1202 | * data in the buffer. If there is data in the | |
1203 | * buffer, no message will be sent now. Code | |
1204 | * elsewhere will send the EOF when the buffer | |
1205 | * becomes empty if stdin_eof is set. | |
1206 | */ | |
5260325f | 1207 | if (buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 1208 | packet_start(SSH_CMSG_EOF); |
1209 | packet_send(); | |
5260325f | 1210 | } |
4bf9c10e | 1211 | } else if (escape_char == SSH_ESCAPECHAR_NONE) { |
aa3378df | 1212 | /* |
1213 | * Normal successful read, and no escape character. | |
1214 | * Just append the data to buffer. | |
1215 | */ | |
5260325f | 1216 | buffer_append(&stdin_buffer, buf, len); |
5260325f | 1217 | } else { |
aa3378df | 1218 | /* |
1219 | * Normal, successful read. But we have an escape character | |
1220 | * and have to process the characters one by one. | |
1221 | */ | |
7e8911cd | 1222 | if (process_escapes(&stdin_buffer, &stdout_buffer, |
1223 | &stderr_buffer, buf, len) == -1) | |
2e73a022 | 1224 | return; |
5260325f | 1225 | } |
1226 | } | |
8efc0c15 | 1227 | } |
1228 | ||
396c147e | 1229 | static void |
5260325f | 1230 | client_process_output(fd_set * writeset) |
8efc0c15 | 1231 | { |
5260325f | 1232 | int len; |
1233 | char buf[100]; | |
1234 | ||
1235 | /* Write buffered output to stdout. */ | |
1236 | if (FD_ISSET(fileno(stdout), writeset)) { | |
1237 | /* Write as much data as possible. */ | |
1238 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1239 | buffer_len(&stdout_buffer)); |
5260325f | 1240 | if (len <= 0) { |
cf6bc93c | 1241 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 1242 | len = 0; |
1243 | else { | |
aa3378df | 1244 | /* |
1245 | * An error or EOF was encountered. Put an | |
1246 | * error message to stderr buffer. | |
1247 | */ | |
5260325f | 1248 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
1249 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 1250 | quit_pending = 1; |
1251 | return; | |
1252 | } | |
1253 | } | |
1254 | /* Consume printed data from the buffer. */ | |
1255 | buffer_consume(&stdout_buffer, len); | |
cd332296 | 1256 | stdout_bytes += len; |
5260325f | 1257 | } |
1258 | /* Write buffered output to stderr. */ | |
1259 | if (FD_ISSET(fileno(stderr), writeset)) { | |
1260 | /* Write as much data as possible. */ | |
1261 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1262 | buffer_len(&stderr_buffer)); |
5260325f | 1263 | if (len <= 0) { |
cf6bc93c | 1264 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 1265 | len = 0; |
1266 | else { | |
aa3378df | 1267 | /* EOF or error, but can't even print error message. */ |
5260325f | 1268 | quit_pending = 1; |
1269 | return; | |
1270 | } | |
1271 | } | |
1272 | /* Consume printed characters from the buffer. */ | |
1273 | buffer_consume(&stderr_buffer, len); | |
cd332296 | 1274 | stderr_bytes += len; |
8efc0c15 | 1275 | } |
8efc0c15 | 1276 | } |
1277 | ||
7368a6c8 | 1278 | /* |
1279 | * Get packets from the connection input buffer, and process them as long as | |
1280 | * there are packets available. | |
1281 | * | |
1282 | * Any unknown packets received during the actual | |
1283 | * session cause the session to terminate. This is | |
1284 | * intended to make debugging easier since no | |
1285 | * confirmations are sent. Any compatible protocol | |
1286 | * extensions must be negotiated during the | |
1287 | * preparatory phase. | |
1288 | */ | |
1289 | ||
396c147e | 1290 | static void |
5ca51e19 | 1291 | client_process_buffered_input_packets(void) |
7368a6c8 | 1292 | { |
e092ce67 | 1293 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); |
7368a6c8 | 1294 | } |
1295 | ||
2e73a022 | 1296 | /* scan buf[] for '~' before sending data to the peer */ |
1297 | ||
396c147e | 1298 | static int |
2e73a022 | 1299 | simple_escape_filter(Channel *c, char *buf, int len) |
1300 | { | |
1301 | /* XXX we assume c->extended is writeable */ | |
1302 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
1303 | } | |
1304 | ||
396c147e | 1305 | static void |
eb0dd41f | 1306 | client_channel_closed(int id, void *arg) |
1307 | { | |
418e724c | 1308 | channel_cancel_cleanup(id); |
eb0dd41f | 1309 | session_closed = 1; |
82de775c | 1310 | leave_raw_mode(); |
eb0dd41f | 1311 | } |
1312 | ||
aa3378df | 1313 | /* |
1314 | * Implements the interactive session with the server. This is called after | |
1315 | * the user has been authenticated, and a command has been started on the | |
4bf9c10e | 1316 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character |
1317 | * used as an escape character for terminating or suspending the session. | |
aa3378df | 1318 | */ |
8efc0c15 | 1319 | |
6ae2364d | 1320 | int |
2e73a022 | 1321 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
8efc0c15 | 1322 | { |
39929cdb | 1323 | fd_set *readset = NULL, *writeset = NULL; |
5260325f | 1324 | double start_time, total_time; |
9a995072 | 1325 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0; |
1326 | u_int nalloc = 0; | |
5260325f | 1327 | char buf[100]; |
1328 | ||
1329 | debug("Entering interactive session."); | |
1330 | ||
1331 | start_time = get_current_time(); | |
1332 | ||
1333 | /* Initialize variables. */ | |
1334 | escape_pending = 0; | |
1335 | last_was_cr = 1; | |
1336 | exit_status = -1; | |
1337 | stdin_eof = 0; | |
1338 | buffer_high = 64 * 1024; | |
1339 | connection_in = packet_get_connection_in(); | |
1340 | connection_out = packet_get_connection_out(); | |
39929cdb | 1341 | max_fd = MAX(connection_in, connection_out); |
5e96b616 | 1342 | if (control_fd != -1) |
1343 | max_fd = MAX(max_fd, control_fd); | |
39929cdb | 1344 | |
1345 | if (!compat20) { | |
e968270c | 1346 | /* enable nonblocking unless tty */ |
1347 | if (!isatty(fileno(stdin))) | |
1348 | set_nonblock(fileno(stdin)); | |
1349 | if (!isatty(fileno(stdout))) | |
1350 | set_nonblock(fileno(stdout)); | |
1351 | if (!isatty(fileno(stderr))) | |
1352 | set_nonblock(fileno(stderr)); | |
39929cdb | 1353 | max_fd = MAX(max_fd, fileno(stdin)); |
1354 | max_fd = MAX(max_fd, fileno(stdout)); | |
1355 | max_fd = MAX(max_fd, fileno(stderr)); | |
1356 | } | |
5260325f | 1357 | stdin_bytes = 0; |
1358 | stdout_bytes = 0; | |
1359 | stderr_bytes = 0; | |
1360 | quit_pending = 0; | |
1361 | escape_char = escape_char_arg; | |
1362 | ||
1363 | /* Initialize buffers. */ | |
1364 | buffer_init(&stdin_buffer); | |
1365 | buffer_init(&stdout_buffer); | |
1366 | buffer_init(&stderr_buffer); | |
1367 | ||
7368a6c8 | 1368 | client_init_dispatch(); |
1369 | ||
3c93c917 | 1370 | /* |
1371 | * Set signal handlers, (e.g. to restore non-blocking mode) | |
1372 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) | |
1373 | */ | |
d3e5d1e9 | 1374 | if (signal(SIGHUP, SIG_IGN) != SIG_IGN) |
1375 | signal(SIGHUP, signal_handler); | |
3c93c917 | 1376 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
1377 | signal(SIGINT, signal_handler); | |
1378 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) | |
1379 | signal(SIGQUIT, signal_handler); | |
1380 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) | |
1381 | signal(SIGTERM, signal_handler); | |
2c9a4d41 | 1382 | signal(SIGWINCH, window_change_handler); |
5260325f | 1383 | |
5260325f | 1384 | if (have_pty) |
1385 | enter_raw_mode(); | |
1386 | ||
1fc8ccdf | 1387 | if (compat20) { |
1388 | session_ident = ssh2_chan_id; | |
4bf9c10e | 1389 | if (escape_char != SSH_ESCAPECHAR_NONE) |
1fc8ccdf | 1390 | channel_register_filter(session_ident, |
c1c6a032 | 1391 | simple_escape_filter, NULL); |
eb0dd41f | 1392 | if (session_ident != -1) |
1393 | channel_register_cleanup(session_ident, | |
8cd0437d | 1394 | client_channel_closed, 0); |
1fc8ccdf | 1395 | } else { |
1396 | /* Check if we should immediately send eof on stdin. */ | |
8ce64345 | 1397 | client_check_initial_eof_on_stdin(); |
1fc8ccdf | 1398 | } |
2e73a022 | 1399 | |
5260325f | 1400 | /* Main loop of the client for the interactive session mode. */ |
1401 | while (!quit_pending) { | |
5260325f | 1402 | |
aa3378df | 1403 | /* Process buffered packets sent by the server. */ |
5260325f | 1404 | client_process_buffered_input_packets(); |
1405 | ||
eb0dd41f | 1406 | if (compat20 && session_closed && !channel_still_open()) |
8ce64345 | 1407 | break; |
eb0dd41f | 1408 | |
1409 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
8ce64345 | 1410 | |
c422989b | 1411 | if (rekeying) { |
1412 | debug("rekeying in progress"); | |
1413 | } else { | |
1414 | /* | |
1415 | * Make packets of buffered stdin data, and buffer | |
1416 | * them for sending to the server. | |
1417 | */ | |
1418 | if (!compat20) | |
1419 | client_make_packets_from_stdin_data(); | |
5260325f | 1420 | |
c422989b | 1421 | /* |
1422 | * Make packets from buffered channel data, and | |
1423 | * enqueue them for sending to the server. | |
1424 | */ | |
1425 | if (packet_not_very_much_data_to_write()) | |
1426 | channel_output_poll(); | |
5260325f | 1427 | |
c422989b | 1428 | /* |
1429 | * Check if the window size has changed, and buffer a | |
1430 | * message about it to the server if so. | |
1431 | */ | |
1432 | client_check_window_change(); | |
5260325f | 1433 | |
c422989b | 1434 | if (quit_pending) |
1435 | break; | |
1436 | } | |
aa3378df | 1437 | /* |
1438 | * Wait until we have something to do (something becomes | |
1439 | * available on one of the descriptors). | |
1440 | */ | |
489aa2e9 | 1441 | max_fd2 = max_fd; |
c422989b | 1442 | client_wait_until_can_do_something(&readset, &writeset, |
489aa2e9 | 1443 | &max_fd2, &nalloc, rekeying); |
5260325f | 1444 | |
1445 | if (quit_pending) | |
1446 | break; | |
1447 | ||
c422989b | 1448 | /* Do channel operations unless rekeying in progress. */ |
1449 | if (!rekeying) { | |
1450 | channel_after_select(readset, writeset); | |
ffd7b36b | 1451 | if (need_rekeying || packet_need_rekeying()) { |
1452 | debug("need rekeying"); | |
c422989b | 1453 | xxx_kex->done = 0; |
1454 | kex_send_kexinit(xxx_kex); | |
1455 | need_rekeying = 0; | |
1456 | } | |
1457 | } | |
5260325f | 1458 | |
8ce64345 | 1459 | /* Buffer input from the connection. */ |
39929cdb | 1460 | client_process_net_input(readset); |
5260325f | 1461 | |
5e96b616 | 1462 | /* Accept control connections. */ |
1463 | client_process_control(readset); | |
1464 | ||
8ce64345 | 1465 | if (quit_pending) |
1466 | break; | |
1467 | ||
1468 | if (!compat20) { | |
1469 | /* Buffer data from stdin */ | |
39929cdb | 1470 | client_process_input(readset); |
8ce64345 | 1471 | /* |
1472 | * Process output to stdout and stderr. Output to | |
1473 | * the connection is processed elsewhere (above). | |
1474 | */ | |
39929cdb | 1475 | client_process_output(writeset); |
8ce64345 | 1476 | } |
5260325f | 1477 | |
aa3378df | 1478 | /* Send as much buffered packet data as possible to the sender. */ |
39929cdb | 1479 | if (FD_ISSET(connection_out, writeset)) |
5260325f | 1480 | packet_write_poll(); |
1481 | } | |
39929cdb | 1482 | if (readset) |
1483 | xfree(readset); | |
1484 | if (writeset) | |
1485 | xfree(writeset); | |
5260325f | 1486 | |
1487 | /* Terminate the session. */ | |
1488 | ||
1489 | /* Stop watching for window change. */ | |
2c9a4d41 | 1490 | signal(SIGWINCH, SIG_DFL); |
5260325f | 1491 | |
d6746a0b | 1492 | channel_free_all(); |
5260325f | 1493 | |
c9130033 | 1494 | if (have_pty) |
1495 | leave_raw_mode(); | |
89aa792b | 1496 | |
1497 | /* restore blocking io */ | |
1498 | if (!isatty(fileno(stdin))) | |
1499 | unset_nonblock(fileno(stdin)); | |
1500 | if (!isatty(fileno(stdout))) | |
1501 | unset_nonblock(fileno(stdout)); | |
1502 | if (!isatty(fileno(stderr))) | |
1503 | unset_nonblock(fileno(stderr)); | |
1504 | ||
66357af5 | 1505 | /* |
1506 | * If there was no shell or command requested, there will be no remote | |
1507 | * exit status to be returned. In that case, clear error code if the | |
1508 | * connection was deliberately terminated at this end. | |
1509 | */ | |
1510 | if (no_shell_flag && received_signal == SIGTERM) { | |
1511 | received_signal = 0; | |
1512 | exit_status = 0; | |
1513 | } | |
1514 | ||
82de775c | 1515 | if (received_signal) |
010f9726 | 1516 | fatal("Killed by signal %d.", (int) received_signal); |
c9130033 | 1517 | |
1518 | /* | |
1519 | * In interactive mode (with pseudo tty) display a message indicating | |
1520 | * that the connection has been closed. | |
1521 | */ | |
1522 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { | |
1523 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
1524 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1525 | } | |
1526 | ||
5260325f | 1527 | /* Output any buffered data for stdout. */ |
89aa792b | 1528 | while (buffer_len(&stdout_buffer) > 0) { |
1529 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1530 | buffer_len(&stdout_buffer)); |
89aa792b | 1531 | if (len <= 0) { |
5260325f | 1532 | error("Write failed flushing stdout buffer."); |
89aa792b | 1533 | break; |
1534 | } | |
5260325f | 1535 | buffer_consume(&stdout_buffer, len); |
cd332296 | 1536 | stdout_bytes += len; |
8efc0c15 | 1537 | } |
5260325f | 1538 | |
1539 | /* Output any buffered data for stderr. */ | |
89aa792b | 1540 | while (buffer_len(&stderr_buffer) > 0) { |
1541 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1542 | buffer_len(&stderr_buffer)); |
89aa792b | 1543 | if (len <= 0) { |
5260325f | 1544 | error("Write failed flushing stderr buffer."); |
89aa792b | 1545 | break; |
1546 | } | |
5260325f | 1547 | buffer_consume(&stderr_buffer, len); |
cd332296 | 1548 | stderr_bytes += len; |
5260325f | 1549 | } |
1550 | ||
5260325f | 1551 | /* Clear and free any buffers. */ |
1552 | memset(buf, 0, sizeof(buf)); | |
1553 | buffer_free(&stdin_buffer); | |
1554 | buffer_free(&stdout_buffer); | |
1555 | buffer_free(&stderr_buffer); | |
1556 | ||
1557 | /* Report bytes transferred, and transfer rates. */ | |
1558 | total_time = get_current_time() - start_time; | |
1559 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
184eed6a | 1560 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); |
5260325f | 1561 | if (total_time > 0) |
1562 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
184eed6a | 1563 | stdin_bytes / total_time, stdout_bytes / total_time, |
1564 | stderr_bytes / total_time); | |
5260325f | 1565 | |
1566 | /* Return the exit status of the program. */ | |
1567 | debug("Exit status %d", exit_status); | |
1568 | return exit_status; | |
8efc0c15 | 1569 | } |
7368a6c8 | 1570 | |
1571 | /*********/ | |
1572 | ||
396c147e | 1573 | static void |
7819b5c3 | 1574 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1575 | { |
1e3b8b07 | 1576 | u_int data_len; |
7368a6c8 | 1577 | char *data = packet_get_string(&data_len); |
95500969 | 1578 | packet_check_eom(); |
7368a6c8 | 1579 | buffer_append(&stdout_buffer, data, data_len); |
7368a6c8 | 1580 | memset(data, 0, data_len); |
1581 | xfree(data); | |
1582 | } | |
396c147e | 1583 | static void |
7819b5c3 | 1584 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1585 | { |
1e3b8b07 | 1586 | u_int data_len; |
7368a6c8 | 1587 | char *data = packet_get_string(&data_len); |
95500969 | 1588 | packet_check_eom(); |
7368a6c8 | 1589 | buffer_append(&stderr_buffer, data, data_len); |
7368a6c8 | 1590 | memset(data, 0, data_len); |
1591 | xfree(data); | |
1592 | } | |
396c147e | 1593 | static void |
7819b5c3 | 1594 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1595 | { |
7368a6c8 | 1596 | exit_status = packet_get_int(); |
95500969 | 1597 | packet_check_eom(); |
7368a6c8 | 1598 | /* Acknowledge the exit. */ |
1599 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1600 | packet_send(); | |
1601 | /* | |
1602 | * Must wait for packet to be sent since we are | |
1603 | * exiting the loop. | |
1604 | */ | |
1605 | packet_write_wait(); | |
1606 | /* Flag that we want to exit. */ | |
1607 | quit_pending = 1; | |
1608 | } | |
c15706e2 | 1609 | static void |
1610 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) | |
1611 | { | |
1612 | Channel *c = NULL; | |
1613 | int remote_id, sock; | |
1614 | ||
1615 | /* Read the remote channel number from the message. */ | |
1616 | remote_id = packet_get_int(); | |
1617 | packet_check_eom(); | |
1618 | ||
1619 | /* | |
1620 | * Get a connection to the local authentication agent (this may again | |
1621 | * get forwarded). | |
1622 | */ | |
1623 | sock = ssh_get_authentication_socket(); | |
1624 | ||
1625 | /* | |
1626 | * If we could not connect the agent, send an error message back to | |
1627 | * the server. This should never happen unless the agent dies, | |
1628 | * because authentication forwarding is only enabled if we have an | |
1629 | * agent. | |
1630 | */ | |
1631 | if (sock >= 0) { | |
1632 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, | |
1633 | -1, 0, 0, 0, "authentication agent connection", 1); | |
1634 | c->remote_id = remote_id; | |
1635 | c->force_drain = 1; | |
1636 | } | |
1637 | if (c == NULL) { | |
1638 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1639 | packet_put_int(remote_id); | |
1640 | } else { | |
1641 | /* Send a confirmation to the remote host. */ | |
1642 | debug("Forwarding authentication connection."); | |
1643 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1644 | packet_put_int(remote_id); | |
1645 | packet_put_int(c->self); | |
1646 | } | |
1647 | packet_send(); | |
1648 | } | |
7368a6c8 | 1649 | |
396c147e | 1650 | static Channel * |
fa08c86b | 1651 | client_request_forwarded_tcpip(const char *request_type, int rchan) |
1652 | { | |
343288b8 | 1653 | Channel *c = NULL; |
fa08c86b | 1654 | char *listen_address, *originator_address; |
1655 | int listen_port, originator_port; | |
719fc62f | 1656 | int sock; |
fa08c86b | 1657 | |
1658 | /* Get rest of the packet */ | |
1659 | listen_address = packet_get_string(NULL); | |
1660 | listen_port = packet_get_int(); | |
1661 | originator_address = packet_get_string(NULL); | |
1662 | originator_port = packet_get_int(); | |
95500969 | 1663 | packet_check_eom(); |
fa08c86b | 1664 | |
1665 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", | |
1666 | listen_address, listen_port, originator_address, originator_port); | |
1667 | ||
b3f8a79c | 1668 | sock = channel_connect_by_listen_address(listen_port); |
719fc62f | 1669 | if (sock < 0) { |
1670 | xfree(originator_address); | |
1671 | xfree(listen_address); | |
1672 | return NULL; | |
1673 | } | |
1674 | c = channel_new("forwarded-tcpip", | |
1675 | SSH_CHANNEL_CONNECTING, sock, sock, -1, | |
1676 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
0d942eff | 1677 | originator_address, 1); |
fa08c86b | 1678 | xfree(originator_address); |
1679 | xfree(listen_address); | |
1680 | return c; | |
1681 | } | |
1682 | ||
343288b8 | 1683 | static Channel * |
fa08c86b | 1684 | client_request_x11(const char *request_type, int rchan) |
1685 | { | |
1686 | Channel *c = NULL; | |
1687 | char *originator; | |
1688 | int originator_port; | |
719fc62f | 1689 | int sock; |
fa08c86b | 1690 | |
1691 | if (!options.forward_x11) { | |
1692 | error("Warning: ssh server tried X11 forwarding."); | |
1908529f | 1693 | error("Warning: this is probably a break-in attempt by a malicious server."); |
fa08c86b | 1694 | return NULL; |
1695 | } | |
1696 | originator = packet_get_string(NULL); | |
1697 | if (datafellows & SSH_BUG_X11FWD) { | |
1698 | debug2("buggy server: x11 request w/o originator_port"); | |
1699 | originator_port = 0; | |
1700 | } else { | |
1701 | originator_port = packet_get_int(); | |
1702 | } | |
95500969 | 1703 | packet_check_eom(); |
fa08c86b | 1704 | /* XXX check permission */ |
865ac82e | 1705 | debug("client_request_x11: request from %s %d", originator, |
1706 | originator_port); | |
719fc62f | 1707 | xfree(originator); |
fa08c86b | 1708 | sock = x11_connect_display(); |
719fc62f | 1709 | if (sock < 0) |
1710 | return NULL; | |
1711 | c = channel_new("x11", | |
1712 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
0d942eff | 1713 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
a5f82435 | 1714 | c->force_drain = 1; |
fa08c86b | 1715 | return c; |
1716 | } | |
1717 | ||
343288b8 | 1718 | static Channel * |
fa08c86b | 1719 | client_request_agent(const char *request_type, int rchan) |
1720 | { | |
1721 | Channel *c = NULL; | |
719fc62f | 1722 | int sock; |
fa08c86b | 1723 | |
1724 | if (!options.forward_agent) { | |
1725 | error("Warning: ssh server tried agent forwarding."); | |
1908529f | 1726 | error("Warning: this is probably a break-in attempt by a malicious server."); |
fa08c86b | 1727 | return NULL; |
1728 | } | |
1729 | sock = ssh_get_authentication_socket(); | |
719fc62f | 1730 | if (sock < 0) |
1731 | return NULL; | |
1732 | c = channel_new("authentication agent connection", | |
1733 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1734 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
0d942eff | 1735 | "authentication agent connection", 1); |
a5f82435 | 1736 | c->force_drain = 1; |
fa08c86b | 1737 | return c; |
1738 | } | |
1739 | ||
0b242b12 | 1740 | /* XXXX move to generic input handler */ |
396c147e | 1741 | static void |
7819b5c3 | 1742 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 1743 | { |
1744 | Channel *c = NULL; | |
1745 | char *ctype; | |
0b242b12 | 1746 | int rchan; |
f91d9a89 | 1747 | u_int rmaxpack, rwindow, len; |
0b242b12 | 1748 | |
1749 | ctype = packet_get_string(&len); | |
1750 | rchan = packet_get_int(); | |
1751 | rwindow = packet_get_int(); | |
1752 | rmaxpack = packet_get_int(); | |
1753 | ||
1d1ffb87 | 1754 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
0b242b12 | 1755 | ctype, rchan, rwindow, rmaxpack); |
1756 | ||
fa08c86b | 1757 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
1758 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1759 | } else if (strcmp(ctype, "x11") == 0) { | |
1760 | c = client_request_x11(ctype, rchan); | |
1761 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1762 | c = client_request_agent(ctype, rchan); | |
0b242b12 | 1763 | } |
1764 | /* XXX duplicate : */ | |
1765 | if (c != NULL) { | |
1766 | debug("confirm %s", ctype); | |
1767 | c->remote_id = rchan; | |
1768 | c->remote_window = rwindow; | |
1769 | c->remote_maxpacket = rmaxpack; | |
a01a10dd | 1770 | if (c->type != SSH_CHANNEL_CONNECTING) { |
1771 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1772 | packet_put_int(c->remote_id); | |
1773 | packet_put_int(c->self); | |
1774 | packet_put_int(c->local_window); | |
1775 | packet_put_int(c->local_maxpacket); | |
1776 | packet_send(); | |
1777 | } | |
0b242b12 | 1778 | } else { |
1779 | debug("failure %s", ctype); | |
1780 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1781 | packet_put_int(rchan); | |
1782 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
fbe90f7b | 1783 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
a01a10dd | 1784 | packet_put_cstring("open failed"); |
fbe90f7b | 1785 | packet_put_cstring(""); |
1786 | } | |
0b242b12 | 1787 | packet_send(); |
1788 | } | |
1789 | xfree(ctype); | |
1790 | } | |
396c147e | 1791 | static void |
7819b5c3 | 1792 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
1fc8ccdf | 1793 | { |
1794 | Channel *c = NULL; | |
5e96b616 | 1795 | int exitval, id, reply, success = 0; |
1fc8ccdf | 1796 | char *rtype; |
1797 | ||
1798 | id = packet_get_int(); | |
1799 | rtype = packet_get_string(NULL); | |
1800 | reply = packet_get_char(); | |
1801 | ||
1802 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1803 | id, rtype, reply); | |
1804 | ||
13de3560 | 1805 | if (id == -1) { |
1806 | error("client_input_channel_req: request for channel -1"); | |
1807 | } else if ((c = channel_lookup(id)) == NULL) { | |
1fc8ccdf | 1808 | error("client_input_channel_req: channel %d: unknown channel", id); |
1809 | } else if (strcmp(rtype, "exit-status") == 0) { | |
5e96b616 | 1810 | exitval = packet_get_int(); |
1811 | if (id == session_ident) { | |
1812 | success = 1; | |
1813 | exit_status = exitval; | |
1814 | } else if (c->ctl_fd == -1) { | |
1815 | error("client_input_channel_req: unexpected channel %d", | |
1816 | session_ident); | |
1817 | } else { | |
1818 | atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval)); | |
1819 | success = 1; | |
1820 | } | |
95500969 | 1821 | packet_check_eom(); |
1fc8ccdf | 1822 | } |
1823 | if (reply) { | |
1824 | packet_start(success ? | |
1825 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
13de3560 | 1826 | packet_put_int(id); |
1fc8ccdf | 1827 | packet_send(); |
1828 | } | |
1829 | xfree(rtype); | |
1830 | } | |
3d209bbe | 1831 | static void |
1832 | client_input_global_request(int type, u_int32_t seq, void *ctxt) | |
1833 | { | |
1834 | char *rtype; | |
1835 | int want_reply; | |
1836 | int success = 0; | |
1837 | ||
1838 | rtype = packet_get_string(NULL); | |
1839 | want_reply = packet_get_char(); | |
5d8d32a3 | 1840 | debug("client_input_global_request: rtype %s want_reply %d", |
1841 | rtype, want_reply); | |
3d209bbe | 1842 | if (want_reply) { |
1843 | packet_start(success ? | |
1844 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1845 | packet_send(); | |
1846 | packet_write_wait(); | |
1847 | } | |
1848 | xfree(rtype); | |
1849 | } | |
0b242b12 | 1850 | |
5e96b616 | 1851 | void |
f2107e97 | 1852 | client_session2_setup(int id, int want_tty, int want_subsystem, |
1786be35 | 1853 | const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env, |
5e96b616 | 1854 | dispatch_fn *subsys_repl) |
1855 | { | |
1856 | int len; | |
2c9a4d41 | 1857 | Channel *c = NULL; |
5e96b616 | 1858 | |
1859 | debug2("%s: id %d", __func__, id); | |
1860 | ||
2c9a4d41 | 1861 | if ((c = channel_lookup(id)) == NULL) |
1862 | fatal("client_session2_setup: channel %d: unknown channel", id); | |
1863 | ||
5e96b616 | 1864 | if (want_tty) { |
1865 | struct winsize ws; | |
1866 | struct termios tio; | |
1867 | ||
1868 | /* Store window size in the packet. */ | |
1869 | if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) | |
1870 | memset(&ws, 0, sizeof(ws)); | |
1871 | ||
1872 | channel_request_start(id, "pty-req", 0); | |
1873 | packet_put_cstring(term != NULL ? term : ""); | |
1874 | packet_put_int(ws.ws_col); | |
1875 | packet_put_int(ws.ws_row); | |
1876 | packet_put_int(ws.ws_xpixel); | |
1877 | packet_put_int(ws.ws_ypixel); | |
1878 | tio = get_saved_tio(); | |
1879 | tty_make_modes(-1, tiop != NULL ? tiop : &tio); | |
1880 | packet_send(); | |
1881 | /* XXX wait for reply */ | |
2c9a4d41 | 1882 | c->client_tty = 1; |
5e96b616 | 1883 | } |
1884 | ||
1885 | /* Transfer any environment variables from client to server */ | |
1786be35 | 1886 | if (options.num_send_env != 0 && env != NULL) { |
5e96b616 | 1887 | int i, j, matched; |
5e96b616 | 1888 | char *name, *val; |
1889 | ||
1890 | debug("Sending environment."); | |
1786be35 | 1891 | for (i = 0; env[i] != NULL; i++) { |
5e96b616 | 1892 | /* Split */ |
1786be35 | 1893 | name = xstrdup(env[i]); |
5e96b616 | 1894 | if ((val = strchr(name, '=')) == NULL) { |
8c4bd764 | 1895 | xfree(name); |
5e96b616 | 1896 | continue; |
1897 | } | |
1898 | *val++ = '\0'; | |
1899 | ||
1900 | matched = 0; | |
1901 | for (j = 0; j < options.num_send_env; j++) { | |
1902 | if (match_pattern(name, options.send_env[j])) { | |
1903 | matched = 1; | |
1904 | break; | |
1905 | } | |
1906 | } | |
1907 | if (!matched) { | |
1908 | debug3("Ignored env %s", name); | |
8c4bd764 | 1909 | xfree(name); |
5e96b616 | 1910 | continue; |
1911 | } | |
1912 | ||
1913 | debug("Sending env %s = %s", name, val); | |
1914 | channel_request_start(id, "env", 0); | |
1915 | packet_put_cstring(name); | |
1916 | packet_put_cstring(val); | |
1917 | packet_send(); | |
8c4bd764 | 1918 | xfree(name); |
5e96b616 | 1919 | } |
1920 | } | |
1921 | ||
1922 | len = buffer_len(cmd); | |
1923 | if (len > 0) { | |
1924 | if (len > 900) | |
1925 | len = 900; | |
1926 | if (want_subsystem) { | |
1927 | debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1928 | channel_request_start(id, "subsystem", subsys_repl != NULL); | |
1929 | if (subsys_repl != NULL) { | |
1930 | /* register callback for reply */ | |
1931 | /* XXX we assume that client_loop has already been called */ | |
1932 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl); | |
1933 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl); | |
1934 | } | |
1935 | } else { | |
1936 | debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1937 | channel_request_start(id, "exec", 0); | |
1938 | } | |
1939 | packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); | |
1940 | packet_send(); | |
1941 | } else { | |
1942 | channel_request_start(id, "shell", 0); | |
1943 | packet_send(); | |
1944 | } | |
1945 | } | |
1946 | ||
396c147e | 1947 | static void |
5ca51e19 | 1948 | client_init_dispatch_20(void) |
8ce64345 | 1949 | { |
7a37c112 | 1950 | dispatch_init(&dispatch_protocol_error); |
e0ae8728 | 1951 | |
8ce64345 | 1952 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
1953 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1954 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1955 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
0b242b12 | 1956 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
8ce64345 | 1957 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1958 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1fc8ccdf | 1959 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
8ce64345 | 1960 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
3d209bbe | 1961 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
7a37c112 | 1962 | |
1963 | /* rekeying */ | |
1964 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
e0ae8728 | 1965 | |
1966 | /* global request reply messages */ | |
1967 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); | |
1968 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); | |
8ce64345 | 1969 | } |
396c147e | 1970 | static void |
5ca51e19 | 1971 | client_init_dispatch_13(void) |
7368a6c8 | 1972 | { |
1973 | dispatch_init(NULL); | |
1974 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1975 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1976 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
7368a6c8 | 1977 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1978 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1979 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
7368a6c8 | 1980 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
1981 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1982 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
a22aff1f | 1983 | |
1984 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
c15706e2 | 1985 | &client_input_agent_open : &deny_input_open); |
a22aff1f | 1986 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
1987 | &x11_input_open : &deny_input_open); | |
7368a6c8 | 1988 | } |
396c147e | 1989 | static void |
5ca51e19 | 1990 | client_init_dispatch_15(void) |
7368a6c8 | 1991 | { |
1992 | client_init_dispatch_13(); | |
1993 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1994 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1995 | } | |
eea46d13 | 1996 | static void |
5ca51e19 | 1997 | client_init_dispatch(void) |
7368a6c8 | 1998 | { |
8ce64345 | 1999 | if (compat20) |
2000 | client_init_dispatch_20(); | |
2001 | else if (compat13) | |
7368a6c8 | 2002 | client_init_dispatch_13(); |
2003 | else | |
2004 | client_init_dispatch_15(); | |
2005 | } | |
82de775c | 2006 | |
2007 | /* client specific fatal cleanup */ | |
2008 | void | |
2362db19 | 2009 | cleanup_exit(int i) |
82de775c | 2010 | { |
82de775c | 2011 | leave_raw_mode(); |
2012 | leave_non_blocking(); | |
5e96b616 | 2013 | if (options.control_path != NULL && control_fd != -1) |
2014 | unlink(options.control_path); | |
2362db19 | 2015 | _exit(i); |
82de775c | 2016 | } |