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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" | |
a75f5360 | 62 | RCSID("$OpenBSD: clientloop.c,v 1.151 2006/02/08 12:15:27 stevesk Exp $"); |
1d3e026f | 63 | |
a75f5360 | 64 | #include <paths.h> |
1d3e026f | 65 | #include <termios.h> |
8efc0c15 | 66 | |
8efc0c15 | 67 | #include "ssh.h" |
42f11eb2 | 68 | #include "ssh1.h" |
69 | #include "ssh2.h" | |
70 | #include "xmalloc.h" | |
8efc0c15 | 71 | #include "packet.h" |
72 | #include "buffer.h" | |
7368a6c8 | 73 | #include "compat.h" |
a5efa1bb | 74 | #include "channels.h" |
7368a6c8 | 75 | #include "dispatch.h" |
2e73a022 | 76 | #include "buffer.h" |
77 | #include "bufaux.h" | |
fa08c86b | 78 | #include "key.h" |
e092ce67 | 79 | #include "kex.h" |
42f11eb2 | 80 | #include "log.h" |
81 | #include "readconf.h" | |
b5c334cc | 82 | #include "clientloop.h" |
ceec33f3 | 83 | #include "sshconnect.h" |
42f11eb2 | 84 | #include "authfd.h" |
85 | #include "atomicio.h" | |
07d80252 | 86 | #include "sshpty.h" |
e968270c | 87 | #include "misc.h" |
5e96b616 | 88 | #include "monitor_fdpass.h" |
89 | #include "match.h" | |
90 | #include "msg.h" | |
a22aff1f | 91 | |
92 | /* import options */ | |
93 | extern Options options; | |
94 | ||
8efc0c15 | 95 | /* Flag indicating that stdin should be redirected from /dev/null. */ |
96 | extern int stdin_null_flag; | |
97 | ||
66357af5 | 98 | /* Flag indicating that no shell has been requested */ |
99 | extern int no_shell_flag; | |
100 | ||
5e96b616 | 101 | /* Control socket */ |
102 | extern int control_fd; | |
103 | ||
aa3378df | 104 | /* |
105 | * Name of the host we are connecting to. This is the name given on the | |
106 | * command line, or the HostName specified for the user-supplied name in a | |
107 | * configuration file. | |
108 | */ | |
8efc0c15 | 109 | extern char *host; |
110 | ||
aa3378df | 111 | /* |
112 | * Flag to indicate that we have received a window change signal which has | |
113 | * not yet been processed. This will cause a message indicating the new | |
114 | * window size to be sent to the server a little later. This is volatile | |
115 | * because this is updated in a signal handler. | |
116 | */ | |
7a934d1b | 117 | static volatile sig_atomic_t received_window_change_signal = 0; |
118 | static volatile sig_atomic_t received_signal = 0; | |
8efc0c15 | 119 | |
7b9b0103 | 120 | /* Flag indicating whether the user's terminal is in non-blocking mode. */ |
8efc0c15 | 121 | static int in_non_blocking_mode = 0; |
122 | ||
123 | /* Common data for the client loop code. */ | |
2e73a022 | 124 | static int quit_pending; /* Set to non-zero to quit the client loop. */ |
125 | static int escape_char; /* Escape character. */ | |
5260325f | 126 | static int escape_pending; /* Last character was the escape character */ |
127 | static int last_was_cr; /* Last character was a newline. */ | |
128 | static int exit_status; /* Used to store the exit status of the command. */ | |
129 | static int stdin_eof; /* EOF has been encountered on standard error. */ | |
130 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
131 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
132 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
1e3b8b07 | 133 | static u_long stdin_bytes, stdout_bytes, stderr_bytes; |
134 | static u_int buffer_high;/* Soft max buffer size. */ | |
5260325f | 135 | static int connection_in; /* Connection to server (input). */ |
136 | static int connection_out; /* Connection to server (output). */ | |
c422989b | 137 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ |
eb0dd41f | 138 | static int session_closed = 0; /* In SSH2: login session closed. */ |
5d8d32a3 | 139 | static int server_alive_timeouts = 0; |
8efc0c15 | 140 | |
396c147e | 141 | static void client_init_dispatch(void); |
8ce64345 | 142 | int session_ident = -1; |
143 | ||
5e96b616 | 144 | struct confirm_ctx { |
145 | int want_tty; | |
146 | int want_subsys; | |
ef07103c | 147 | int want_x_fwd; |
148 | int want_agent_fwd; | |
5e96b616 | 149 | Buffer cmd; |
150 | char *term; | |
151 | struct termios tio; | |
1786be35 | 152 | char **env; |
5e96b616 | 153 | }; |
154 | ||
e092ce67 | 155 | /*XXX*/ |
156 | extern Kex *xxx_kex; | |
157 | ||
5e96b616 | 158 | void ssh_process_session2_setup(int, int, int, Buffer *); |
159 | ||
8efc0c15 | 160 | /* Restores stdin to blocking mode. */ |
161 | ||
396c147e | 162 | static void |
5ca51e19 | 163 | leave_non_blocking(void) |
8efc0c15 | 164 | { |
5260325f | 165 | if (in_non_blocking_mode) { |
1b273ece | 166 | unset_nonblock(fileno(stdin)); |
5260325f | 167 | in_non_blocking_mode = 0; |
5260325f | 168 | } |
8efc0c15 | 169 | } |
170 | ||
5260325f | 171 | /* Puts stdin terminal in non-blocking mode. */ |
172 | ||
396c147e | 173 | static void |
5ca51e19 | 174 | enter_non_blocking(void) |
8efc0c15 | 175 | { |
5260325f | 176 | in_non_blocking_mode = 1; |
170694d7 | 177 | set_nonblock(fileno(stdin)); |
8efc0c15 | 178 | } |
179 | ||
aa3378df | 180 | /* |
181 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
182 | * flag indicating that the window has changed. | |
183 | */ | |
8efc0c15 | 184 | |
396c147e | 185 | static void |
5260325f | 186 | window_change_handler(int sig) |
8efc0c15 | 187 | { |
5260325f | 188 | received_window_change_signal = 1; |
189 | signal(SIGWINCH, window_change_handler); | |
8efc0c15 | 190 | } |
191 | ||
aa3378df | 192 | /* |
193 | * Signal handler for signals that cause the program to terminate. These | |
194 | * signals must be trapped to restore terminal modes. | |
195 | */ | |
8efc0c15 | 196 | |
396c147e | 197 | static void |
5260325f | 198 | signal_handler(int sig) |
8efc0c15 | 199 | { |
c9130033 | 200 | received_signal = sig; |
201 | quit_pending = 1; | |
8efc0c15 | 202 | } |
203 | ||
aa3378df | 204 | /* |
205 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
206 | * available resolution. | |
207 | */ | |
8efc0c15 | 208 | |
396c147e | 209 | static double |
5ca51e19 | 210 | get_current_time(void) |
8efc0c15 | 211 | { |
5260325f | 212 | struct timeval tv; |
213 | gettimeofday(&tv, NULL); | |
214 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
8efc0c15 | 215 | } |
216 | ||
9bf083eb | 217 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
218 | void | |
219 | client_x11_get_proto(const char *display, const char *xauth_path, | |
220 | u_int trusted, char **_proto, char **_data) | |
221 | { | |
222 | char cmd[1024]; | |
223 | char line[512]; | |
224 | char xdisplay[512]; | |
225 | static char proto[512], data[512]; | |
226 | FILE *f; | |
227 | int got_data = 0, generated = 0, do_unlink = 0, i; | |
228 | char *xauthdir, *xauthfile; | |
229 | struct stat st; | |
230 | ||
231 | xauthdir = xauthfile = NULL; | |
232 | *_proto = proto; | |
233 | *_data = data; | |
234 | proto[0] = data[0] = '\0'; | |
235 | ||
236 | if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { | |
237 | debug("No xauth program."); | |
238 | } else { | |
239 | if (display == NULL) { | |
240 | debug("x11_get_proto: DISPLAY not set"); | |
241 | return; | |
242 | } | |
243 | /* | |
244 | * Handle FamilyLocal case where $DISPLAY does | |
245 | * not match an authorization entry. For this we | |
246 | * just try "xauth list unix:displaynum.screennum". | |
247 | * XXX: "localhost" match to determine FamilyLocal | |
248 | * is not perfect. | |
249 | */ | |
250 | if (strncmp(display, "localhost:", 10) == 0) { | |
251 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", | |
252 | display + 10); | |
253 | display = xdisplay; | |
254 | } | |
255 | if (trusted == 0) { | |
256 | xauthdir = xmalloc(MAXPATHLEN); | |
257 | xauthfile = xmalloc(MAXPATHLEN); | |
258 | strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); | |
259 | if (mkdtemp(xauthdir) != NULL) { | |
260 | do_unlink = 1; | |
261 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", | |
262 | xauthdir); | |
263 | snprintf(cmd, sizeof(cmd), | |
264 | "%s -f %s generate %s " SSH_X11_PROTO | |
265 | " untrusted timeout 1200 2>" _PATH_DEVNULL, | |
266 | xauth_path, xauthfile, display); | |
267 | debug2("x11_get_proto: %s", cmd); | |
268 | if (system(cmd) == 0) | |
269 | generated = 1; | |
270 | } | |
271 | } | |
272 | snprintf(cmd, sizeof(cmd), | |
b5443199 | 273 | "%s %s%s list %s 2>" _PATH_DEVNULL, |
9bf083eb | 274 | xauth_path, |
275 | generated ? "-f " : "" , | |
276 | generated ? xauthfile : "", | |
277 | display); | |
278 | debug2("x11_get_proto: %s", cmd); | |
279 | f = popen(cmd, "r"); | |
280 | if (f && fgets(line, sizeof(line), f) && | |
281 | sscanf(line, "%*s %511s %511s", proto, data) == 2) | |
282 | got_data = 1; | |
283 | if (f) | |
284 | pclose(f); | |
285 | } | |
286 | ||
287 | if (do_unlink) { | |
288 | unlink(xauthfile); | |
289 | rmdir(xauthdir); | |
290 | } | |
291 | if (xauthdir) | |
292 | xfree(xauthdir); | |
293 | if (xauthfile) | |
294 | xfree(xauthfile); | |
295 | ||
296 | /* | |
297 | * If we didn't get authentication data, just make up some | |
298 | * data. The forwarding code will check the validity of the | |
299 | * response anyway, and substitute this data. The X11 | |
300 | * server, however, will ignore this fake data and use | |
301 | * whatever authentication mechanisms it was using otherwise | |
302 | * for the local connection. | |
303 | */ | |
304 | if (!got_data) { | |
305 | u_int32_t rnd = 0; | |
306 | ||
307 | logit("Warning: No xauth data; " | |
308 | "using fake authentication data for X11 forwarding."); | |
309 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); | |
310 | for (i = 0; i < 16; i++) { | |
311 | if (i % 4 == 0) | |
312 | rnd = arc4random(); | |
313 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", | |
314 | rnd & 0xff); | |
315 | rnd >>= 8; | |
316 | } | |
317 | } | |
318 | } | |
319 | ||
aa3378df | 320 | /* |
321 | * This is called when the interactive is entered. This checks if there is | |
322 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
323 | * not appear to wake up when redirecting from /dev/null. | |
324 | */ | |
8efc0c15 | 325 | |
396c147e | 326 | static void |
5ca51e19 | 327 | client_check_initial_eof_on_stdin(void) |
8efc0c15 | 328 | { |
5260325f | 329 | int len; |
330 | char buf[1]; | |
331 | ||
aa3378df | 332 | /* |
333 | * If standard input is to be "redirected from /dev/null", we simply | |
334 | * mark that we have seen an EOF and send an EOF message to the | |
335 | * server. Otherwise, we try to read a single character; it appears | |
336 | * that for some files, such /dev/null, select() never wakes up for | |
337 | * read for this descriptor, which means that we never get EOF. This | |
338 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
339 | */ | |
5260325f | 340 | if (stdin_null_flag) { |
341 | /* Fake EOF on stdin. */ | |
342 | debug("Sending eof."); | |
343 | stdin_eof = 1; | |
344 | packet_start(SSH_CMSG_EOF); | |
345 | packet_send(); | |
346 | } else { | |
5260325f | 347 | enter_non_blocking(); |
348 | ||
349 | /* Check for immediate EOF on stdin. */ | |
350 | len = read(fileno(stdin), buf, 1); | |
351 | if (len == 0) { | |
aa3378df | 352 | /* EOF. Record that we have seen it and send EOF to server. */ |
5260325f | 353 | debug("Sending eof."); |
354 | stdin_eof = 1; | |
355 | packet_start(SSH_CMSG_EOF); | |
356 | packet_send(); | |
357 | } else if (len > 0) { | |
aa3378df | 358 | /* |
359 | * Got data. We must store the data in the buffer, | |
360 | * and also process it as an escape character if | |
361 | * appropriate. | |
362 | */ | |
1e3b8b07 | 363 | if ((u_char) buf[0] == escape_char) |
5260325f | 364 | escape_pending = 1; |
7e8911cd | 365 | else |
5260325f | 366 | buffer_append(&stdin_buffer, buf, 1); |
5260325f | 367 | } |
5260325f | 368 | leave_non_blocking(); |
8efc0c15 | 369 | } |
8efc0c15 | 370 | } |
371 | ||
8efc0c15 | 372 | |
aa3378df | 373 | /* |
374 | * Make packets from buffered stdin data, and buffer them for sending to the | |
375 | * connection. | |
376 | */ | |
8efc0c15 | 377 | |
396c147e | 378 | static void |
5ca51e19 | 379 | client_make_packets_from_stdin_data(void) |
8efc0c15 | 380 | { |
1e3b8b07 | 381 | u_int len; |
5260325f | 382 | |
383 | /* Send buffered stdin data to the server. */ | |
384 | while (buffer_len(&stdin_buffer) > 0 && | |
184eed6a | 385 | packet_not_very_much_data_to_write()) { |
5260325f | 386 | len = buffer_len(&stdin_buffer); |
387 | /* Keep the packets at reasonable size. */ | |
388 | if (len > packet_get_maxsize()) | |
389 | len = packet_get_maxsize(); | |
390 | packet_start(SSH_CMSG_STDIN_DATA); | |
391 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
392 | packet_send(); | |
393 | buffer_consume(&stdin_buffer, len); | |
7e8911cd | 394 | stdin_bytes += len; |
5260325f | 395 | /* If we have a pending EOF, send it now. */ |
396 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
397 | packet_start(SSH_CMSG_EOF); | |
398 | packet_send(); | |
399 | } | |
8efc0c15 | 400 | } |
8efc0c15 | 401 | } |
402 | ||
aa3378df | 403 | /* |
404 | * Checks if the client window has changed, and sends a packet about it to | |
405 | * the server if so. The actual change is detected elsewhere (by a software | |
406 | * interrupt on Unix); this just checks the flag and sends a message if | |
407 | * appropriate. | |
408 | */ | |
8efc0c15 | 409 | |
396c147e | 410 | static void |
5ca51e19 | 411 | client_check_window_change(void) |
8efc0c15 | 412 | { |
8ce64345 | 413 | struct winsize ws; |
414 | ||
415 | if (! received_window_change_signal) | |
416 | return; | |
417 | /** XXX race */ | |
418 | received_window_change_signal = 0; | |
419 | ||
de273eef | 420 | debug2("client_check_window_change: changed"); |
8ce64345 | 421 | |
422 | if (compat20) { | |
5e96b616 | 423 | channel_send_window_changes(); |
8ce64345 | 424 | } else { |
5e96b616 | 425 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
426 | return; | |
8ce64345 | 427 | packet_start(SSH_CMSG_WINDOW_SIZE); |
428 | packet_put_int(ws.ws_row); | |
429 | packet_put_int(ws.ws_col); | |
430 | packet_put_int(ws.ws_xpixel); | |
431 | packet_put_int(ws.ws_ypixel); | |
432 | packet_send(); | |
8efc0c15 | 433 | } |
8efc0c15 | 434 | } |
435 | ||
5d8d32a3 | 436 | static void |
437 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
438 | { | |
439 | server_alive_timeouts = 0; | |
440 | client_global_request_reply_fwd(type, seq, ctxt); | |
441 | } | |
442 | ||
443 | static void | |
444 | server_alive_check(void) | |
445 | { | |
446 | if (++server_alive_timeouts > options.server_alive_count_max) | |
447 | packet_disconnect("Timeout, server not responding."); | |
448 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
449 | packet_put_cstring("keepalive@openssh.com"); | |
450 | packet_put_char(1); /* boolean: want reply */ | |
451 | packet_send(); | |
452 | } | |
453 | ||
aa3378df | 454 | /* |
455 | * Waits until the client can do something (some data becomes available on | |
456 | * one of the file descriptors). | |
457 | */ | |
396c147e | 458 | static void |
39929cdb | 459 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
9a995072 | 460 | int *maxfdp, u_int *nallocp, int rekeying) |
8efc0c15 | 461 | { |
5d8d32a3 | 462 | struct timeval tv, *tvp; |
463 | int ret; | |
464 | ||
39929cdb | 465 | /* Add any selections by the channel mechanism. */ |
489aa2e9 | 466 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); |
5260325f | 467 | |
8ce64345 | 468 | if (!compat20) { |
469 | /* Read from the connection, unless our buffers are full. */ | |
470 | if (buffer_len(&stdout_buffer) < buffer_high && | |
471 | buffer_len(&stderr_buffer) < buffer_high && | |
472 | channel_not_very_much_buffered_data()) | |
39929cdb | 473 | FD_SET(connection_in, *readsetp); |
8ce64345 | 474 | /* |
475 | * Read from stdin, unless we have seen EOF or have very much | |
476 | * buffered data to send to the server. | |
477 | */ | |
478 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
39929cdb | 479 | FD_SET(fileno(stdin), *readsetp); |
8ce64345 | 480 | |
481 | /* Select stdout/stderr if have data in buffer. */ | |
482 | if (buffer_len(&stdout_buffer) > 0) | |
39929cdb | 483 | FD_SET(fileno(stdout), *writesetp); |
8ce64345 | 484 | if (buffer_len(&stderr_buffer) > 0) |
39929cdb | 485 | FD_SET(fileno(stderr), *writesetp); |
8ce64345 | 486 | } else { |
24b6b45f | 487 | /* channel_prepare_select could have closed the last channel */ |
fd6cfbaf | 488 | if (session_closed && !channel_still_open() && |
489 | !packet_have_data_to_write()) { | |
490 | /* clear mask since we did not call select() */ | |
b3ad8fe6 | 491 | memset(*readsetp, 0, *nallocp); |
492 | memset(*writesetp, 0, *nallocp); | |
fd6cfbaf | 493 | return; |
24b6b45f | 494 | } else { |
495 | FD_SET(connection_in, *readsetp); | |
496 | } | |
8ce64345 | 497 | } |
5260325f | 498 | |
5260325f | 499 | /* Select server connection if have data to write to the server. */ |
500 | if (packet_have_data_to_write()) | |
39929cdb | 501 | FD_SET(connection_out, *writesetp); |
5260325f | 502 | |
5e96b616 | 503 | if (control_fd != -1) |
504 | FD_SET(control_fd, *readsetp); | |
505 | ||
aa3378df | 506 | /* |
507 | * Wait for something to happen. This will suspend the process until | |
508 | * some selected descriptor can be read, written, or has some other | |
5d8d32a3 | 509 | * event pending. |
aa3378df | 510 | */ |
5260325f | 511 | |
5d8d32a3 | 512 | if (options.server_alive_interval == 0 || !compat20) |
513 | tvp = NULL; | |
f2107e97 | 514 | else { |
5d8d32a3 | 515 | tv.tv_sec = options.server_alive_interval; |
516 | tv.tv_usec = 0; | |
517 | tvp = &tv; | |
518 | } | |
519 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); | |
520 | if (ret < 0) { | |
5260325f | 521 | char buf[100]; |
fd193ca4 | 522 | |
523 | /* | |
524 | * We have to clear the select masks, because we return. | |
525 | * We have to return, because the mainloop checks for the flags | |
526 | * set by the signal handlers. | |
527 | */ | |
b3ad8fe6 | 528 | memset(*readsetp, 0, *nallocp); |
529 | memset(*writesetp, 0, *nallocp); | |
fd193ca4 | 530 | |
5260325f | 531 | if (errno == EINTR) |
532 | return; | |
533 | /* Note: we might still have data in the buffers. */ | |
534 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
535 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 536 | quit_pending = 1; |
5d8d32a3 | 537 | } else if (ret == 0) |
538 | server_alive_check(); | |
8efc0c15 | 539 | } |
540 | ||
396c147e | 541 | static void |
2e73a022 | 542 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
8efc0c15 | 543 | { |
5260325f | 544 | /* Flush stdout and stderr buffers. */ |
2e73a022 | 545 | if (buffer_len(bout) > 0) |
dc54438a | 546 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); |
2e73a022 | 547 | if (buffer_len(berr) > 0) |
dc54438a | 548 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); |
5260325f | 549 | |
5260325f | 550 | leave_raw_mode(); |
551 | ||
aa3378df | 552 | /* |
553 | * Free (and clear) the buffer to reduce the amount of data that gets | |
554 | * written to swap. | |
555 | */ | |
2e73a022 | 556 | buffer_free(bin); |
557 | buffer_free(bout); | |
558 | buffer_free(berr); | |
5260325f | 559 | |
5260325f | 560 | /* Send the suspend signal to the program itself. */ |
561 | kill(getpid(), SIGTSTP); | |
562 | ||
2c9a4d41 | 563 | /* Reset window sizes in case they have changed */ |
564 | received_window_change_signal = 1; | |
5260325f | 565 | |
566 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
2e73a022 | 567 | buffer_init(bin); |
568 | buffer_init(bout); | |
569 | buffer_init(berr); | |
5260325f | 570 | |
5260325f | 571 | enter_raw_mode(); |
8efc0c15 | 572 | } |
573 | ||
396c147e | 574 | static void |
8ce64345 | 575 | client_process_net_input(fd_set * readset) |
8efc0c15 | 576 | { |
8ce64345 | 577 | int len; |
578 | char buf[8192]; | |
5260325f | 579 | |
aa3378df | 580 | /* |
581 | * Read input from the server, and add any such data to the buffer of | |
582 | * the packet subsystem. | |
583 | */ | |
5260325f | 584 | if (FD_ISSET(connection_in, readset)) { |
585 | /* Read as much as possible. */ | |
586 | len = read(connection_in, buf, sizeof(buf)); | |
587 | if (len == 0) { | |
588 | /* Received EOF. The remote host has closed the connection. */ | |
589 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
590 | host); | |
8efc0c15 | 591 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
8efc0c15 | 592 | quit_pending = 1; |
593 | return; | |
5260325f | 594 | } |
aa3378df | 595 | /* |
596 | * There is a kernel bug on Solaris that causes select to | |
597 | * sometimes wake up even though there is no data available. | |
598 | */ | |
09cb311c | 599 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
5260325f | 600 | len = 0; |
601 | ||
602 | if (len < 0) { | |
603 | /* An error has encountered. Perhaps there is a network problem. */ | |
604 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
605 | host, strerror(errno)); | |
606 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 607 | quit_pending = 1; |
608 | return; | |
609 | } | |
610 | packet_process_incoming(buf, len); | |
611 | } | |
8ce64345 | 612 | } |
613 | ||
5e96b616 | 614 | static void |
615 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) | |
616 | { | |
617 | int id; | |
618 | Channel *c; | |
f2107e97 | 619 | |
5e96b616 | 620 | id = packet_get_int(); |
621 | packet_check_eom(); | |
622 | ||
623 | if ((c = channel_lookup(id)) == NULL) { | |
624 | error("%s: no channel for id %d", __func__, id); | |
625 | return; | |
626 | } | |
627 | ||
628 | if (type == SSH2_MSG_CHANNEL_SUCCESS) | |
629 | debug2("Request suceeded on channel %d", id); | |
630 | else if (type == SSH2_MSG_CHANNEL_FAILURE) { | |
631 | error("Request failed on channel %d", id); | |
632 | channel_free(c); | |
633 | } | |
634 | } | |
635 | ||
636 | static void | |
637 | client_extra_session2_setup(int id, void *arg) | |
638 | { | |
639 | struct confirm_ctx *cctx = arg; | |
ef07103c | 640 | const char *display; |
5e96b616 | 641 | Channel *c; |
1786be35 | 642 | int i; |
f2107e97 | 643 | |
5e96b616 | 644 | if (cctx == NULL) |
645 | fatal("%s: cctx == NULL", __func__); | |
646 | if ((c = channel_lookup(id)) == NULL) | |
647 | fatal("%s: no channel for id %d", __func__, id); | |
648 | ||
56964485 | 649 | display = getenv("DISPLAY"); |
ef07103c | 650 | if (cctx->want_x_fwd && options.forward_x11 && display != NULL) { |
651 | char *proto, *data; | |
652 | /* Get reasonable local authentication information. */ | |
653 | client_x11_get_proto(display, options.xauth_location, | |
654 | options.forward_x11_trusted, &proto, &data); | |
655 | /* Request forwarding with authentication spoofing. */ | |
656 | debug("Requesting X11 forwarding with authentication spoofing."); | |
657 | x11_request_forwarding_with_spoofing(id, display, proto, data); | |
658 | /* XXX wait for reply */ | |
659 | } | |
660 | ||
661 | if (cctx->want_agent_fwd && options.forward_agent) { | |
662 | debug("Requesting authentication agent forwarding."); | |
663 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
664 | packet_send(); | |
665 | } | |
666 | ||
f2107e97 | 667 | client_session2_setup(id, cctx->want_tty, cctx->want_subsys, |
1786be35 | 668 | cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env, |
5e96b616 | 669 | client_subsystem_reply); |
0d34d6ce | 670 | |
5e96b616 | 671 | c->confirm_ctx = NULL; |
672 | buffer_free(&cctx->cmd); | |
1786be35 | 673 | xfree(cctx->term); |
674 | if (cctx->env != NULL) { | |
675 | for (i = 0; cctx->env[i] != NULL; i++) | |
676 | xfree(cctx->env[i]); | |
677 | xfree(cctx->env); | |
f2107e97 | 678 | } |
1786be35 | 679 | xfree(cctx); |
5e96b616 | 680 | } |
681 | ||
682 | static void | |
683 | client_process_control(fd_set * readset) | |
684 | { | |
685 | Buffer m; | |
686 | Channel *c; | |
2ceb8101 | 687 | int client_fd, new_fd[3], ver, allowed; |
5e96b616 | 688 | socklen_t addrlen; |
689 | struct sockaddr_storage addr; | |
690 | struct confirm_ctx *cctx; | |
691 | char *cmd; | |
2ceb8101 | 692 | u_int i, len, env_len, command, flags; |
5e96b616 | 693 | uid_t euid; |
694 | gid_t egid; | |
695 | ||
696 | /* | |
697 | * Accept connection on control socket | |
698 | */ | |
699 | if (control_fd == -1 || !FD_ISSET(control_fd, readset)) | |
700 | return; | |
701 | ||
702 | memset(&addr, 0, sizeof(addr)); | |
703 | addrlen = sizeof(addr); | |
704 | if ((client_fd = accept(control_fd, | |
705 | (struct sockaddr*)&addr, &addrlen)) == -1) { | |
706 | error("%s accept: %s", __func__, strerror(errno)); | |
707 | return; | |
708 | } | |
709 | ||
710 | if (getpeereid(client_fd, &euid, &egid) < 0) { | |
711 | error("%s getpeereid failed: %s", __func__, strerror(errno)); | |
712 | close(client_fd); | |
713 | return; | |
714 | } | |
715 | if ((euid != 0) && (getuid() != euid)) { | |
716 | error("control mode uid mismatch: peer euid %u != uid %u", | |
717 | (u_int) euid, (u_int) getuid()); | |
718 | close(client_fd); | |
719 | return; | |
720 | } | |
0d34d6ce | 721 | |
5e96b616 | 722 | unset_nonblock(client_fd); |
723 | ||
f8c6db83 | 724 | /* Read command */ |
5e96b616 | 725 | buffer_init(&m); |
f8c6db83 | 726 | if (ssh_msg_recv(client_fd, &m) == -1) { |
727 | error("%s: client msg_recv failed", __func__); | |
728 | close(client_fd); | |
729 | buffer_free(&m); | |
730 | return; | |
731 | } | |
ef07103c | 732 | if ((ver = buffer_get_char(&m)) != SSHMUX_VER) { |
f8c6db83 | 733 | error("%s: wrong client version %d", __func__, ver); |
734 | buffer_free(&m); | |
735 | close(client_fd); | |
736 | return; | |
737 | } | |
738 | ||
739 | allowed = 1; | |
740 | command = buffer_get_int(&m); | |
741 | flags = buffer_get_int(&m); | |
742 | ||
743 | buffer_clear(&m); | |
5e96b616 | 744 | |
f8c6db83 | 745 | switch (command) { |
746 | case SSHMUX_COMMAND_OPEN: | |
9dfd96d6 | 747 | if (options.control_master == SSHCTL_MASTER_ASK || |
748 | options.control_master == SSHCTL_MASTER_AUTO_ASK) | |
f8c6db83 | 749 | allowed = ask_permission("Allow shared connection " |
750 | "to %s? ", host); | |
751 | /* continue below */ | |
752 | break; | |
753 | case SSHMUX_COMMAND_TERMINATE: | |
9dfd96d6 | 754 | if (options.control_master == SSHCTL_MASTER_ASK || |
755 | options.control_master == SSHCTL_MASTER_AUTO_ASK) | |
f8c6db83 | 756 | allowed = ask_permission("Terminate shared connection " |
757 | "to %s? ", host); | |
758 | if (allowed) | |
759 | quit_pending = 1; | |
f8cc7664 | 760 | /* FALLTHROUGH */ |
f8c6db83 | 761 | case SSHMUX_COMMAND_ALIVE_CHECK: |
762 | /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */ | |
763 | buffer_clear(&m); | |
764 | buffer_put_int(&m, allowed); | |
765 | buffer_put_int(&m, getpid()); | |
ef07103c | 766 | if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { |
f8c6db83 | 767 | error("%s: client msg_send failed", __func__); |
768 | close(client_fd); | |
769 | buffer_free(&m); | |
770 | return; | |
771 | } | |
772 | buffer_free(&m); | |
773 | close(client_fd); | |
774 | return; | |
775 | default: | |
776 | error("Unsupported command %d", command); | |
777 | buffer_free(&m); | |
778 | close(client_fd); | |
779 | return; | |
780 | } | |
781 | ||
782 | /* Reply for SSHMUX_COMMAND_OPEN */ | |
783 | buffer_clear(&m); | |
0d34d6ce | 784 | buffer_put_int(&m, allowed); |
5e96b616 | 785 | buffer_put_int(&m, getpid()); |
ef07103c | 786 | if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { |
5e96b616 | 787 | error("%s: client msg_send failed", __func__); |
788 | close(client_fd); | |
0d34d6ce | 789 | buffer_free(&m); |
5e96b616 | 790 | return; |
791 | } | |
5e96b616 | 792 | |
0d34d6ce | 793 | if (!allowed) { |
794 | error("Refused control connection"); | |
795 | close(client_fd); | |
796 | buffer_free(&m); | |
797 | return; | |
798 | } | |
799 | ||
f8c6db83 | 800 | buffer_clear(&m); |
5e96b616 | 801 | if (ssh_msg_recv(client_fd, &m) == -1) { |
802 | error("%s: client msg_recv failed", __func__); | |
803 | close(client_fd); | |
0d34d6ce | 804 | buffer_free(&m); |
5e96b616 | 805 | return; |
806 | } | |
ef07103c | 807 | if ((ver = buffer_get_char(&m)) != SSHMUX_VER) { |
5e96b616 | 808 | error("%s: wrong client version %d", __func__, ver); |
809 | buffer_free(&m); | |
810 | close(client_fd); | |
811 | return; | |
812 | } | |
813 | ||
814 | cctx = xmalloc(sizeof(*cctx)); | |
815 | memset(cctx, 0, sizeof(*cctx)); | |
f8c6db83 | 816 | cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0; |
817 | cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0; | |
ef07103c | 818 | cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0; |
819 | cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0; | |
5e96b616 | 820 | cctx->term = buffer_get_string(&m, &len); |
821 | ||
822 | cmd = buffer_get_string(&m, &len); | |
823 | buffer_init(&cctx->cmd); | |
824 | buffer_append(&cctx->cmd, cmd, strlen(cmd)); | |
825 | ||
1786be35 | 826 | env_len = buffer_get_int(&m); |
827 | env_len = MIN(env_len, 4096); | |
828 | debug3("%s: receiving %d env vars", __func__, env_len); | |
829 | if (env_len != 0) { | |
830 | cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1)); | |
831 | for (i = 0; i < env_len; i++) | |
832 | cctx->env[i] = buffer_get_string(&m, &len); | |
833 | cctx->env[i] = NULL; | |
834 | } | |
835 | ||
5e96b616 | 836 | debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__, |
837 | cctx->want_tty, cctx->want_subsys, cmd); | |
838 | ||
839 | /* Gather fds from client */ | |
840 | new_fd[0] = mm_receive_fd(client_fd); | |
841 | new_fd[1] = mm_receive_fd(client_fd); | |
842 | new_fd[2] = mm_receive_fd(client_fd); | |
843 | ||
844 | debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__, | |
845 | new_fd[0], new_fd[1], new_fd[2]); | |
846 | ||
847 | /* Try to pick up ttymodes from client before it goes raw */ | |
848 | if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1) | |
849 | error("%s: tcgetattr: %s", __func__, strerror(errno)); | |
850 | ||
f8c6db83 | 851 | /* This roundtrip is just for synchronisation of ttymodes */ |
5e96b616 | 852 | buffer_clear(&m); |
ef07103c | 853 | if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { |
5e96b616 | 854 | error("%s: client msg_send failed", __func__); |
855 | close(client_fd); | |
856 | close(new_fd[0]); | |
857 | close(new_fd[1]); | |
858 | close(new_fd[2]); | |
0d34d6ce | 859 | buffer_free(&m); |
f8c6db83 | 860 | xfree(cctx->term); |
861 | if (env_len != 0) { | |
862 | for (i = 0; i < env_len; i++) | |
863 | xfree(cctx->env[i]); | |
864 | xfree(cctx->env); | |
865 | } | |
5e96b616 | 866 | return; |
867 | } | |
868 | buffer_free(&m); | |
869 | ||
870 | /* enable nonblocking unless tty */ | |
871 | if (!isatty(new_fd[0])) | |
872 | set_nonblock(new_fd[0]); | |
873 | if (!isatty(new_fd[1])) | |
874 | set_nonblock(new_fd[1]); | |
875 | if (!isatty(new_fd[2])) | |
876 | set_nonblock(new_fd[2]); | |
877 | ||
878 | set_nonblock(client_fd); | |
879 | ||
f2107e97 | 880 | c = channel_new("session", SSH_CHANNEL_OPENING, |
5e96b616 | 881 | new_fd[0], new_fd[1], new_fd[2], |
882 | CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT, | |
883 | CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0); | |
884 | ||
885 | /* XXX */ | |
886 | c->ctl_fd = client_fd; | |
887 | ||
888 | debug3("%s: channel_new: %d", __func__, c->self); | |
889 | ||
890 | channel_send_open(c->self); | |
891 | channel_register_confirm(c->self, client_extra_session2_setup, cctx); | |
892 | } | |
893 | ||
c53c54c2 | 894 | static void |
ec9b7086 | 895 | process_cmdline(void) |
c53c54c2 | 896 | { |
c53c54c2 | 897 | void (*handler)(int); |
3867aa0a | 898 | char *s, *cmd, *cancel_host; |
d740ec16 | 899 | int delete = 0; |
c53c54c2 | 900 | int local = 0; |
3867aa0a | 901 | u_short cancel_port; |
902 | Forward fwd; | |
c53c54c2 | 903 | |
904 | leave_raw_mode(); | |
875ec275 | 905 | handler = signal(SIGINT, SIG_IGN); |
ec9b7086 | 906 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
c53c54c2 | 907 | if (s == NULL) |
908 | goto out; | |
c53c54c2 | 909 | while (*s && isspace(*s)) |
910 | s++; | |
d740ec16 | 911 | if (*s == '-') |
912 | s++; /* Skip cmdline '-', if any */ | |
27c6fcae | 913 | if (*s == '\0') |
c53c54c2 | 914 | goto out; |
d740ec16 | 915 | |
7069a5e2 | 916 | if (*s == 'h' || *s == 'H' || *s == '?') { |
d740ec16 | 917 | logit("Commands:"); |
918 | logit(" -Lport:host:hostport Request local forward"); | |
919 | logit(" -Rport:host:hostport Request remote forward"); | |
920 | logit(" -KRhostport Cancel remote forward"); | |
d20f3c9e | 921 | if (!options.permit_local_command) |
922 | goto out; | |
923 | logit(" !args Execute local command"); | |
924 | goto out; | |
925 | } | |
926 | ||
927 | if (*s == '!' && options.permit_local_command) { | |
928 | s++; | |
929 | ssh_local_cmd(s); | |
d740ec16 | 930 | goto out; |
931 | } | |
932 | ||
933 | if (*s == 'K') { | |
934 | delete = 1; | |
935 | s++; | |
936 | } | |
937 | if (*s != 'L' && *s != 'R') { | |
bbe88b6d | 938 | logit("Invalid command."); |
c53c54c2 | 939 | goto out; |
940 | } | |
d740ec16 | 941 | if (*s == 'L') |
c53c54c2 | 942 | local = 1; |
d740ec16 | 943 | if (local && delete) { |
944 | logit("Not supported."); | |
945 | goto out; | |
946 | } | |
947 | if ((!local || delete) && !compat20) { | |
bbe88b6d | 948 | logit("Not supported for SSH protocol version 1."); |
c53c54c2 | 949 | goto out; |
950 | } | |
d740ec16 | 951 | |
952 | s++; | |
c53c54c2 | 953 | while (*s && isspace(*s)) |
954 | s++; | |
955 | ||
d740ec16 | 956 | if (delete) { |
3867aa0a | 957 | cancel_port = 0; |
958 | cancel_host = hpdelim(&s); /* may be NULL */ | |
959 | if (s != NULL) { | |
960 | cancel_port = a2port(s); | |
961 | cancel_host = cleanhostname(cancel_host); | |
962 | } else { | |
963 | cancel_port = a2port(cancel_host); | |
964 | cancel_host = NULL; | |
d740ec16 | 965 | } |
3867aa0a | 966 | if (cancel_port == 0) { |
967 | logit("Bad forwarding close port"); | |
c53c54c2 | 968 | goto out; |
969 | } | |
3867aa0a | 970 | channel_request_rforward_cancel(cancel_host, cancel_port); |
d740ec16 | 971 | } else { |
3867aa0a | 972 | if (!parse_forward(&fwd, s)) { |
d740ec16 | 973 | logit("Bad forwarding specification."); |
974 | goto out; | |
975 | } | |
d740ec16 | 976 | if (local) { |
3867aa0a | 977 | if (channel_setup_local_fwd_listener(fwd.listen_host, |
978 | fwd.listen_port, fwd.connect_host, | |
979 | fwd.connect_port, options.gateway_ports) < 0) { | |
d740ec16 | 980 | logit("Port forwarding failed."); |
981 | goto out; | |
982 | } | |
3867aa0a | 983 | } else { |
984 | channel_request_remote_forwarding(fwd.listen_host, | |
985 | fwd.listen_port, fwd.connect_host, | |
986 | fwd.connect_port); | |
987 | } | |
988 | ||
d740ec16 | 989 | logit("Forwarding port."); |
990 | } | |
991 | ||
c53c54c2 | 992 | out: |
993 | signal(SIGINT, handler); | |
994 | enter_raw_mode(); | |
995 | if (cmd) | |
996 | xfree(cmd); | |
997 | } | |
998 | ||
2e73a022 | 999 | /* process the characters one by one */ |
396c147e | 1000 | static int |
2e73a022 | 1001 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) |
1002 | { | |
1003 | char string[1024]; | |
1004 | pid_t pid; | |
1005 | int bytes = 0; | |
1e3b8b07 | 1006 | u_int i; |
1007 | u_char ch; | |
2e73a022 | 1008 | char *s; |
1009 | ||
2ceb8101 | 1010 | if (len <= 0) |
1011 | return (0); | |
1012 | ||
1013 | for (i = 0; i < (u_int)len; i++) { | |
2e73a022 | 1014 | /* Get one character at a time. */ |
1015 | ch = buf[i]; | |
1016 | ||
1017 | if (escape_pending) { | |
1018 | /* We have previously seen an escape character. */ | |
1019 | /* Clear the flag now. */ | |
1020 | escape_pending = 0; | |
1021 | ||
1022 | /* Process the escaped character. */ | |
1023 | switch (ch) { | |
1024 | case '.': | |
1025 | /* Terminate the connection. */ | |
1026 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
1027 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 1028 | |
1029 | quit_pending = 1; | |
1030 | return -1; | |
1031 | ||
1032 | case 'Z' - 64: | |
1033 | /* Suspend the program. */ | |
1034 | /* Print a message to that effect to the user. */ | |
1035 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
1036 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 1037 | |
1038 | /* Restore terminal modes and suspend. */ | |
1039 | client_suspend_self(bin, bout, berr); | |
1040 | ||
1041 | /* We have been continued. */ | |
1042 | continue; | |
1043 | ||
16a79097 | 1044 | case 'B': |
1045 | if (compat20) { | |
1046 | snprintf(string, sizeof string, | |
1047 | "%cB\r\n", escape_char); | |
1048 | buffer_append(berr, string, | |
1049 | strlen(string)); | |
1050 | channel_request_start(session_ident, | |
1051 | "break", 0); | |
1052 | packet_put_int(1000); | |
1053 | packet_send(); | |
1054 | } | |
1055 | continue; | |
1056 | ||
e092ce67 | 1057 | case 'R': |
54506d2e | 1058 | if (compat20) { |
1059 | if (datafellows & SSH_BUG_NOREKEY) | |
bbe88b6d | 1060 | logit("Server does not support re-keying"); |
54506d2e | 1061 | else |
1062 | need_rekeying = 1; | |
1063 | } | |
e092ce67 | 1064 | continue; |
1065 | ||
2e73a022 | 1066 | case '&': |
2e73a022 | 1067 | /* |
1068 | * Detach the program (continue to serve connections, | |
1069 | * but put in background and no more new connections). | |
1070 | */ | |
2e73a022 | 1071 | /* Restore tty modes. */ |
1072 | leave_raw_mode(); | |
1073 | ||
1074 | /* Stop listening for new connections. */ | |
c6940381 | 1075 | channel_stop_listening(); |
2e73a022 | 1076 | |
c6940381 | 1077 | snprintf(string, sizeof string, |
1078 | "%c& [backgrounded]\n", escape_char); | |
1079 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 1080 | |
1081 | /* Fork into background. */ | |
1082 | pid = fork(); | |
1083 | if (pid < 0) { | |
1084 | error("fork: %.100s", strerror(errno)); | |
1085 | continue; | |
1086 | } | |
1087 | if (pid != 0) { /* This is the parent. */ | |
1088 | /* The parent just exits. */ | |
1089 | exit(0); | |
1090 | } | |
1091 | /* The child continues serving connections. */ | |
c6940381 | 1092 | if (compat20) { |
1093 | buffer_append(bin, "\004", 1); | |
1094 | /* fake EOF on stdin */ | |
1095 | return -1; | |
1096 | } else if (!stdin_eof) { | |
1097 | /* | |
1098 | * Sending SSH_CMSG_EOF alone does not always appear | |
1099 | * to be enough. So we try to send an EOF character | |
1100 | * first. | |
1101 | */ | |
1102 | packet_start(SSH_CMSG_STDIN_DATA); | |
1103 | packet_put_string("\004", 1); | |
1104 | packet_send(); | |
1105 | /* Close stdin. */ | |
1106 | stdin_eof = 1; | |
1107 | if (buffer_len(bin) == 0) { | |
1108 | packet_start(SSH_CMSG_EOF); | |
1109 | packet_send(); | |
1110 | } | |
1111 | } | |
1112 | continue; | |
2e73a022 | 1113 | |
1114 | case '?': | |
1115 | snprintf(string, sizeof string, | |
1116 | "%c?\r\n\ | |
1117 | Supported escape sequences:\r\n\ | |
1d77f8cb | 1118 | %c. - terminate connection\r\n\ |
16a79097 | 1119 | %cB - send a BREAK to the remote system\r\n\ |
1d77f8cb | 1120 | %cC - open a command line\r\n\ |
1121 | %cR - Request rekey (SSH protocol 2 only)\r\n\ | |
1122 | %c^Z - suspend ssh\r\n\ | |
1123 | %c# - list forwarded connections\r\n\ | |
1124 | %c& - background ssh (when waiting for connections to terminate)\r\n\ | |
1125 | %c? - this message\r\n\ | |
1126 | %c%c - send the escape character by typing it twice\r\n\ | |
2e73a022 | 1127 | (Note that escapes are only recognized immediately after newline.)\r\n", |
1d77f8cb | 1128 | escape_char, escape_char, escape_char, escape_char, |
1129 | escape_char, escape_char, escape_char, escape_char, | |
16a79097 | 1130 | escape_char, escape_char, escape_char); |
2e73a022 | 1131 | buffer_append(berr, string, strlen(string)); |
1132 | continue; | |
1133 | ||
1134 | case '#': | |
1135 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
1136 | buffer_append(berr, string, strlen(string)); | |
1137 | s = channel_open_message(); | |
1138 | buffer_append(berr, s, strlen(s)); | |
1139 | xfree(s); | |
1140 | continue; | |
1141 | ||
c53c54c2 | 1142 | case 'C': |
ec9b7086 | 1143 | process_cmdline(); |
c53c54c2 | 1144 | continue; |
1145 | ||
2e73a022 | 1146 | default: |
1147 | if (ch != escape_char) { | |
1148 | buffer_put_char(bin, escape_char); | |
1149 | bytes++; | |
1150 | } | |
1151 | /* Escaped characters fall through here */ | |
1152 | break; | |
1153 | } | |
1154 | } else { | |
1155 | /* | |
1156 | * The previous character was not an escape char. Check if this | |
1157 | * is an escape. | |
1158 | */ | |
1159 | if (last_was_cr && ch == escape_char) { | |
1160 | /* It is. Set the flag and continue to next character. */ | |
1161 | escape_pending = 1; | |
1162 | continue; | |
1163 | } | |
1164 | } | |
1165 | ||
1166 | /* | |
1167 | * Normal character. Record whether it was a newline, | |
1168 | * and append it to the buffer. | |
1169 | */ | |
1170 | last_was_cr = (ch == '\r' || ch == '\n'); | |
1171 | buffer_put_char(bin, ch); | |
1172 | bytes++; | |
1173 | } | |
1174 | return bytes; | |
1175 | } | |
1176 | ||
396c147e | 1177 | static void |
8ce64345 | 1178 | client_process_input(fd_set * readset) |
1179 | { | |
9da5c3c9 | 1180 | int len; |
2e73a022 | 1181 | char buf[8192]; |
8ce64345 | 1182 | |
5260325f | 1183 | /* Read input from stdin. */ |
1184 | if (FD_ISSET(fileno(stdin), readset)) { | |
1185 | /* Read as much as possible. */ | |
1186 | len = read(fileno(stdin), buf, sizeof(buf)); | |
cf6bc93c | 1187 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
1188 | return; /* we'll try again later */ | |
5260325f | 1189 | if (len <= 0) { |
aa3378df | 1190 | /* |
1191 | * Received EOF or error. They are treated | |
1192 | * similarly, except that an error message is printed | |
1193 | * if it was an error condition. | |
1194 | */ | |
5260325f | 1195 | if (len < 0) { |
1196 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
1197 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 1198 | } |
1199 | /* Mark that we have seen EOF. */ | |
1200 | stdin_eof = 1; | |
aa3378df | 1201 | /* |
1202 | * Send an EOF message to the server unless there is | |
1203 | * data in the buffer. If there is data in the | |
1204 | * buffer, no message will be sent now. Code | |
1205 | * elsewhere will send the EOF when the buffer | |
1206 | * becomes empty if stdin_eof is set. | |
1207 | */ | |
5260325f | 1208 | if (buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 1209 | packet_start(SSH_CMSG_EOF); |
1210 | packet_send(); | |
5260325f | 1211 | } |
4bf9c10e | 1212 | } else if (escape_char == SSH_ESCAPECHAR_NONE) { |
aa3378df | 1213 | /* |
1214 | * Normal successful read, and no escape character. | |
1215 | * Just append the data to buffer. | |
1216 | */ | |
5260325f | 1217 | buffer_append(&stdin_buffer, buf, len); |
5260325f | 1218 | } else { |
aa3378df | 1219 | /* |
1220 | * Normal, successful read. But we have an escape character | |
1221 | * and have to process the characters one by one. | |
1222 | */ | |
7e8911cd | 1223 | if (process_escapes(&stdin_buffer, &stdout_buffer, |
1224 | &stderr_buffer, buf, len) == -1) | |
2e73a022 | 1225 | return; |
5260325f | 1226 | } |
1227 | } | |
8efc0c15 | 1228 | } |
1229 | ||
396c147e | 1230 | static void |
5260325f | 1231 | client_process_output(fd_set * writeset) |
8efc0c15 | 1232 | { |
5260325f | 1233 | int len; |
1234 | char buf[100]; | |
1235 | ||
1236 | /* Write buffered output to stdout. */ | |
1237 | if (FD_ISSET(fileno(stdout), writeset)) { | |
1238 | /* Write as much data as possible. */ | |
1239 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1240 | buffer_len(&stdout_buffer)); |
5260325f | 1241 | if (len <= 0) { |
cf6bc93c | 1242 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 1243 | len = 0; |
1244 | else { | |
aa3378df | 1245 | /* |
1246 | * An error or EOF was encountered. Put an | |
1247 | * error message to stderr buffer. | |
1248 | */ | |
5260325f | 1249 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
1250 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 1251 | quit_pending = 1; |
1252 | return; | |
1253 | } | |
1254 | } | |
1255 | /* Consume printed data from the buffer. */ | |
1256 | buffer_consume(&stdout_buffer, len); | |
cd332296 | 1257 | stdout_bytes += len; |
5260325f | 1258 | } |
1259 | /* Write buffered output to stderr. */ | |
1260 | if (FD_ISSET(fileno(stderr), writeset)) { | |
1261 | /* Write as much data as possible. */ | |
1262 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1263 | buffer_len(&stderr_buffer)); |
5260325f | 1264 | if (len <= 0) { |
cf6bc93c | 1265 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 1266 | len = 0; |
1267 | else { | |
aa3378df | 1268 | /* EOF or error, but can't even print error message. */ |
5260325f | 1269 | quit_pending = 1; |
1270 | return; | |
1271 | } | |
1272 | } | |
1273 | /* Consume printed characters from the buffer. */ | |
1274 | buffer_consume(&stderr_buffer, len); | |
cd332296 | 1275 | stderr_bytes += len; |
8efc0c15 | 1276 | } |
8efc0c15 | 1277 | } |
1278 | ||
7368a6c8 | 1279 | /* |
1280 | * Get packets from the connection input buffer, and process them as long as | |
1281 | * there are packets available. | |
1282 | * | |
1283 | * Any unknown packets received during the actual | |
1284 | * session cause the session to terminate. This is | |
1285 | * intended to make debugging easier since no | |
1286 | * confirmations are sent. Any compatible protocol | |
1287 | * extensions must be negotiated during the | |
1288 | * preparatory phase. | |
1289 | */ | |
1290 | ||
396c147e | 1291 | static void |
5ca51e19 | 1292 | client_process_buffered_input_packets(void) |
7368a6c8 | 1293 | { |
e092ce67 | 1294 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); |
7368a6c8 | 1295 | } |
1296 | ||
2e73a022 | 1297 | /* scan buf[] for '~' before sending data to the peer */ |
1298 | ||
396c147e | 1299 | static int |
2e73a022 | 1300 | simple_escape_filter(Channel *c, char *buf, int len) |
1301 | { | |
1302 | /* XXX we assume c->extended is writeable */ | |
1303 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
1304 | } | |
1305 | ||
396c147e | 1306 | static void |
eb0dd41f | 1307 | client_channel_closed(int id, void *arg) |
1308 | { | |
418e724c | 1309 | channel_cancel_cleanup(id); |
eb0dd41f | 1310 | session_closed = 1; |
82de775c | 1311 | leave_raw_mode(); |
eb0dd41f | 1312 | } |
1313 | ||
aa3378df | 1314 | /* |
1315 | * Implements the interactive session with the server. This is called after | |
1316 | * the user has been authenticated, and a command has been started on the | |
4bf9c10e | 1317 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character |
1318 | * used as an escape character for terminating or suspending the session. | |
aa3378df | 1319 | */ |
8efc0c15 | 1320 | |
6ae2364d | 1321 | int |
2e73a022 | 1322 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
8efc0c15 | 1323 | { |
39929cdb | 1324 | fd_set *readset = NULL, *writeset = NULL; |
5260325f | 1325 | double start_time, total_time; |
9a995072 | 1326 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0; |
1327 | u_int nalloc = 0; | |
5260325f | 1328 | char buf[100]; |
1329 | ||
1330 | debug("Entering interactive session."); | |
1331 | ||
1332 | start_time = get_current_time(); | |
1333 | ||
1334 | /* Initialize variables. */ | |
1335 | escape_pending = 0; | |
1336 | last_was_cr = 1; | |
1337 | exit_status = -1; | |
1338 | stdin_eof = 0; | |
1339 | buffer_high = 64 * 1024; | |
1340 | connection_in = packet_get_connection_in(); | |
1341 | connection_out = packet_get_connection_out(); | |
39929cdb | 1342 | max_fd = MAX(connection_in, connection_out); |
5e96b616 | 1343 | if (control_fd != -1) |
1344 | max_fd = MAX(max_fd, control_fd); | |
39929cdb | 1345 | |
1346 | if (!compat20) { | |
e968270c | 1347 | /* enable nonblocking unless tty */ |
1348 | if (!isatty(fileno(stdin))) | |
1349 | set_nonblock(fileno(stdin)); | |
1350 | if (!isatty(fileno(stdout))) | |
1351 | set_nonblock(fileno(stdout)); | |
1352 | if (!isatty(fileno(stderr))) | |
1353 | set_nonblock(fileno(stderr)); | |
39929cdb | 1354 | max_fd = MAX(max_fd, fileno(stdin)); |
1355 | max_fd = MAX(max_fd, fileno(stdout)); | |
1356 | max_fd = MAX(max_fd, fileno(stderr)); | |
1357 | } | |
5260325f | 1358 | stdin_bytes = 0; |
1359 | stdout_bytes = 0; | |
1360 | stderr_bytes = 0; | |
1361 | quit_pending = 0; | |
1362 | escape_char = escape_char_arg; | |
1363 | ||
1364 | /* Initialize buffers. */ | |
1365 | buffer_init(&stdin_buffer); | |
1366 | buffer_init(&stdout_buffer); | |
1367 | buffer_init(&stderr_buffer); | |
1368 | ||
7368a6c8 | 1369 | client_init_dispatch(); |
1370 | ||
3c93c917 | 1371 | /* |
1372 | * Set signal handlers, (e.g. to restore non-blocking mode) | |
1373 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) | |
1374 | */ | |
d3e5d1e9 | 1375 | if (signal(SIGHUP, SIG_IGN) != SIG_IGN) |
1376 | signal(SIGHUP, signal_handler); | |
3c93c917 | 1377 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
1378 | signal(SIGINT, signal_handler); | |
1379 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) | |
1380 | signal(SIGQUIT, signal_handler); | |
1381 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) | |
1382 | signal(SIGTERM, signal_handler); | |
2c9a4d41 | 1383 | signal(SIGWINCH, window_change_handler); |
5260325f | 1384 | |
5260325f | 1385 | if (have_pty) |
1386 | enter_raw_mode(); | |
1387 | ||
1fc8ccdf | 1388 | if (compat20) { |
1389 | session_ident = ssh2_chan_id; | |
4bf9c10e | 1390 | if (escape_char != SSH_ESCAPECHAR_NONE) |
1fc8ccdf | 1391 | channel_register_filter(session_ident, |
c1c6a032 | 1392 | simple_escape_filter, NULL); |
eb0dd41f | 1393 | if (session_ident != -1) |
1394 | channel_register_cleanup(session_ident, | |
8cd0437d | 1395 | client_channel_closed, 0); |
1fc8ccdf | 1396 | } else { |
1397 | /* Check if we should immediately send eof on stdin. */ | |
8ce64345 | 1398 | client_check_initial_eof_on_stdin(); |
1fc8ccdf | 1399 | } |
2e73a022 | 1400 | |
5260325f | 1401 | /* Main loop of the client for the interactive session mode. */ |
1402 | while (!quit_pending) { | |
5260325f | 1403 | |
aa3378df | 1404 | /* Process buffered packets sent by the server. */ |
5260325f | 1405 | client_process_buffered_input_packets(); |
1406 | ||
eb0dd41f | 1407 | if (compat20 && session_closed && !channel_still_open()) |
8ce64345 | 1408 | break; |
eb0dd41f | 1409 | |
1410 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
8ce64345 | 1411 | |
c422989b | 1412 | if (rekeying) { |
1413 | debug("rekeying in progress"); | |
1414 | } else { | |
1415 | /* | |
1416 | * Make packets of buffered stdin data, and buffer | |
1417 | * them for sending to the server. | |
1418 | */ | |
1419 | if (!compat20) | |
1420 | client_make_packets_from_stdin_data(); | |
5260325f | 1421 | |
c422989b | 1422 | /* |
1423 | * Make packets from buffered channel data, and | |
1424 | * enqueue them for sending to the server. | |
1425 | */ | |
1426 | if (packet_not_very_much_data_to_write()) | |
1427 | channel_output_poll(); | |
5260325f | 1428 | |
c422989b | 1429 | /* |
1430 | * Check if the window size has changed, and buffer a | |
1431 | * message about it to the server if so. | |
1432 | */ | |
1433 | client_check_window_change(); | |
5260325f | 1434 | |
c422989b | 1435 | if (quit_pending) |
1436 | break; | |
1437 | } | |
aa3378df | 1438 | /* |
1439 | * Wait until we have something to do (something becomes | |
1440 | * available on one of the descriptors). | |
1441 | */ | |
489aa2e9 | 1442 | max_fd2 = max_fd; |
c422989b | 1443 | client_wait_until_can_do_something(&readset, &writeset, |
489aa2e9 | 1444 | &max_fd2, &nalloc, rekeying); |
5260325f | 1445 | |
1446 | if (quit_pending) | |
1447 | break; | |
1448 | ||
c422989b | 1449 | /* Do channel operations unless rekeying in progress. */ |
1450 | if (!rekeying) { | |
1451 | channel_after_select(readset, writeset); | |
ffd7b36b | 1452 | if (need_rekeying || packet_need_rekeying()) { |
1453 | debug("need rekeying"); | |
c422989b | 1454 | xxx_kex->done = 0; |
1455 | kex_send_kexinit(xxx_kex); | |
1456 | need_rekeying = 0; | |
1457 | } | |
1458 | } | |
5260325f | 1459 | |
8ce64345 | 1460 | /* Buffer input from the connection. */ |
39929cdb | 1461 | client_process_net_input(readset); |
5260325f | 1462 | |
5e96b616 | 1463 | /* Accept control connections. */ |
1464 | client_process_control(readset); | |
1465 | ||
8ce64345 | 1466 | if (quit_pending) |
1467 | break; | |
1468 | ||
1469 | if (!compat20) { | |
1470 | /* Buffer data from stdin */ | |
39929cdb | 1471 | client_process_input(readset); |
8ce64345 | 1472 | /* |
1473 | * Process output to stdout and stderr. Output to | |
1474 | * the connection is processed elsewhere (above). | |
1475 | */ | |
39929cdb | 1476 | client_process_output(writeset); |
8ce64345 | 1477 | } |
5260325f | 1478 | |
aa3378df | 1479 | /* Send as much buffered packet data as possible to the sender. */ |
39929cdb | 1480 | if (FD_ISSET(connection_out, writeset)) |
5260325f | 1481 | packet_write_poll(); |
1482 | } | |
39929cdb | 1483 | if (readset) |
1484 | xfree(readset); | |
1485 | if (writeset) | |
1486 | xfree(writeset); | |
5260325f | 1487 | |
1488 | /* Terminate the session. */ | |
1489 | ||
1490 | /* Stop watching for window change. */ | |
2c9a4d41 | 1491 | signal(SIGWINCH, SIG_DFL); |
5260325f | 1492 | |
d6746a0b | 1493 | channel_free_all(); |
5260325f | 1494 | |
c9130033 | 1495 | if (have_pty) |
1496 | leave_raw_mode(); | |
89aa792b | 1497 | |
1498 | /* restore blocking io */ | |
1499 | if (!isatty(fileno(stdin))) | |
1500 | unset_nonblock(fileno(stdin)); | |
1501 | if (!isatty(fileno(stdout))) | |
1502 | unset_nonblock(fileno(stdout)); | |
1503 | if (!isatty(fileno(stderr))) | |
1504 | unset_nonblock(fileno(stderr)); | |
1505 | ||
66357af5 | 1506 | /* |
1507 | * If there was no shell or command requested, there will be no remote | |
1508 | * exit status to be returned. In that case, clear error code if the | |
1509 | * connection was deliberately terminated at this end. | |
1510 | */ | |
1511 | if (no_shell_flag && received_signal == SIGTERM) { | |
1512 | received_signal = 0; | |
1513 | exit_status = 0; | |
1514 | } | |
1515 | ||
82de775c | 1516 | if (received_signal) |
010f9726 | 1517 | fatal("Killed by signal %d.", (int) received_signal); |
c9130033 | 1518 | |
1519 | /* | |
1520 | * In interactive mode (with pseudo tty) display a message indicating | |
1521 | * that the connection has been closed. | |
1522 | */ | |
1523 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { | |
1524 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
1525 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1526 | } | |
1527 | ||
5260325f | 1528 | /* Output any buffered data for stdout. */ |
89aa792b | 1529 | while (buffer_len(&stdout_buffer) > 0) { |
1530 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1531 | buffer_len(&stdout_buffer)); |
89aa792b | 1532 | if (len <= 0) { |
5260325f | 1533 | error("Write failed flushing stdout buffer."); |
89aa792b | 1534 | break; |
1535 | } | |
5260325f | 1536 | buffer_consume(&stdout_buffer, len); |
cd332296 | 1537 | stdout_bytes += len; |
8efc0c15 | 1538 | } |
5260325f | 1539 | |
1540 | /* Output any buffered data for stderr. */ | |
89aa792b | 1541 | while (buffer_len(&stderr_buffer) > 0) { |
1542 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1543 | buffer_len(&stderr_buffer)); |
89aa792b | 1544 | if (len <= 0) { |
5260325f | 1545 | error("Write failed flushing stderr buffer."); |
89aa792b | 1546 | break; |
1547 | } | |
5260325f | 1548 | buffer_consume(&stderr_buffer, len); |
cd332296 | 1549 | stderr_bytes += len; |
5260325f | 1550 | } |
1551 | ||
5260325f | 1552 | /* Clear and free any buffers. */ |
1553 | memset(buf, 0, sizeof(buf)); | |
1554 | buffer_free(&stdin_buffer); | |
1555 | buffer_free(&stdout_buffer); | |
1556 | buffer_free(&stderr_buffer); | |
1557 | ||
1558 | /* Report bytes transferred, and transfer rates. */ | |
1559 | total_time = get_current_time() - start_time; | |
1560 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
184eed6a | 1561 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); |
5260325f | 1562 | if (total_time > 0) |
1563 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
184eed6a | 1564 | stdin_bytes / total_time, stdout_bytes / total_time, |
1565 | stderr_bytes / total_time); | |
5260325f | 1566 | |
1567 | /* Return the exit status of the program. */ | |
1568 | debug("Exit status %d", exit_status); | |
1569 | return exit_status; | |
8efc0c15 | 1570 | } |
7368a6c8 | 1571 | |
1572 | /*********/ | |
1573 | ||
396c147e | 1574 | static void |
7819b5c3 | 1575 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1576 | { |
1e3b8b07 | 1577 | u_int data_len; |
7368a6c8 | 1578 | char *data = packet_get_string(&data_len); |
95500969 | 1579 | packet_check_eom(); |
7368a6c8 | 1580 | buffer_append(&stdout_buffer, data, data_len); |
7368a6c8 | 1581 | memset(data, 0, data_len); |
1582 | xfree(data); | |
1583 | } | |
396c147e | 1584 | static void |
7819b5c3 | 1585 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1586 | { |
1e3b8b07 | 1587 | u_int data_len; |
7368a6c8 | 1588 | char *data = packet_get_string(&data_len); |
95500969 | 1589 | packet_check_eom(); |
7368a6c8 | 1590 | buffer_append(&stderr_buffer, data, data_len); |
7368a6c8 | 1591 | memset(data, 0, data_len); |
1592 | xfree(data); | |
1593 | } | |
396c147e | 1594 | static void |
7819b5c3 | 1595 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1596 | { |
7368a6c8 | 1597 | exit_status = packet_get_int(); |
95500969 | 1598 | packet_check_eom(); |
7368a6c8 | 1599 | /* Acknowledge the exit. */ |
1600 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1601 | packet_send(); | |
1602 | /* | |
1603 | * Must wait for packet to be sent since we are | |
1604 | * exiting the loop. | |
1605 | */ | |
1606 | packet_write_wait(); | |
1607 | /* Flag that we want to exit. */ | |
1608 | quit_pending = 1; | |
1609 | } | |
c15706e2 | 1610 | static void |
1611 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) | |
1612 | { | |
1613 | Channel *c = NULL; | |
1614 | int remote_id, sock; | |
1615 | ||
1616 | /* Read the remote channel number from the message. */ | |
1617 | remote_id = packet_get_int(); | |
1618 | packet_check_eom(); | |
1619 | ||
1620 | /* | |
1621 | * Get a connection to the local authentication agent (this may again | |
1622 | * get forwarded). | |
1623 | */ | |
1624 | sock = ssh_get_authentication_socket(); | |
1625 | ||
1626 | /* | |
1627 | * If we could not connect the agent, send an error message back to | |
1628 | * the server. This should never happen unless the agent dies, | |
1629 | * because authentication forwarding is only enabled if we have an | |
1630 | * agent. | |
1631 | */ | |
1632 | if (sock >= 0) { | |
1633 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, | |
1634 | -1, 0, 0, 0, "authentication agent connection", 1); | |
1635 | c->remote_id = remote_id; | |
1636 | c->force_drain = 1; | |
1637 | } | |
1638 | if (c == NULL) { | |
1639 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1640 | packet_put_int(remote_id); | |
1641 | } else { | |
1642 | /* Send a confirmation to the remote host. */ | |
1643 | debug("Forwarding authentication connection."); | |
1644 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1645 | packet_put_int(remote_id); | |
1646 | packet_put_int(c->self); | |
1647 | } | |
1648 | packet_send(); | |
1649 | } | |
7368a6c8 | 1650 | |
396c147e | 1651 | static Channel * |
fa08c86b | 1652 | client_request_forwarded_tcpip(const char *request_type, int rchan) |
1653 | { | |
343288b8 | 1654 | Channel *c = NULL; |
fa08c86b | 1655 | char *listen_address, *originator_address; |
1656 | int listen_port, originator_port; | |
719fc62f | 1657 | int sock; |
fa08c86b | 1658 | |
1659 | /* Get rest of the packet */ | |
1660 | listen_address = packet_get_string(NULL); | |
1661 | listen_port = packet_get_int(); | |
1662 | originator_address = packet_get_string(NULL); | |
1663 | originator_port = packet_get_int(); | |
95500969 | 1664 | packet_check_eom(); |
fa08c86b | 1665 | |
1666 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", | |
1667 | listen_address, listen_port, originator_address, originator_port); | |
1668 | ||
b3f8a79c | 1669 | sock = channel_connect_by_listen_address(listen_port); |
719fc62f | 1670 | if (sock < 0) { |
1671 | xfree(originator_address); | |
1672 | xfree(listen_address); | |
1673 | return NULL; | |
1674 | } | |
1675 | c = channel_new("forwarded-tcpip", | |
1676 | SSH_CHANNEL_CONNECTING, sock, sock, -1, | |
1677 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
0d942eff | 1678 | originator_address, 1); |
fa08c86b | 1679 | xfree(originator_address); |
1680 | xfree(listen_address); | |
1681 | return c; | |
1682 | } | |
1683 | ||
343288b8 | 1684 | static Channel * |
fa08c86b | 1685 | client_request_x11(const char *request_type, int rchan) |
1686 | { | |
1687 | Channel *c = NULL; | |
1688 | char *originator; | |
1689 | int originator_port; | |
719fc62f | 1690 | int sock; |
fa08c86b | 1691 | |
1692 | if (!options.forward_x11) { | |
1693 | error("Warning: ssh server tried X11 forwarding."); | |
1908529f | 1694 | error("Warning: this is probably a break-in attempt by a malicious server."); |
fa08c86b | 1695 | return NULL; |
1696 | } | |
1697 | originator = packet_get_string(NULL); | |
1698 | if (datafellows & SSH_BUG_X11FWD) { | |
1699 | debug2("buggy server: x11 request w/o originator_port"); | |
1700 | originator_port = 0; | |
1701 | } else { | |
1702 | originator_port = packet_get_int(); | |
1703 | } | |
95500969 | 1704 | packet_check_eom(); |
fa08c86b | 1705 | /* XXX check permission */ |
865ac82e | 1706 | debug("client_request_x11: request from %s %d", originator, |
1707 | originator_port); | |
719fc62f | 1708 | xfree(originator); |
fa08c86b | 1709 | sock = x11_connect_display(); |
719fc62f | 1710 | if (sock < 0) |
1711 | return NULL; | |
1712 | c = channel_new("x11", | |
1713 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
0d942eff | 1714 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
a5f82435 | 1715 | c->force_drain = 1; |
fa08c86b | 1716 | return c; |
1717 | } | |
1718 | ||
343288b8 | 1719 | static Channel * |
fa08c86b | 1720 | client_request_agent(const char *request_type, int rchan) |
1721 | { | |
1722 | Channel *c = NULL; | |
719fc62f | 1723 | int sock; |
fa08c86b | 1724 | |
1725 | if (!options.forward_agent) { | |
1726 | error("Warning: ssh server tried agent forwarding."); | |
1908529f | 1727 | error("Warning: this is probably a break-in attempt by a malicious server."); |
fa08c86b | 1728 | return NULL; |
1729 | } | |
1730 | sock = ssh_get_authentication_socket(); | |
719fc62f | 1731 | if (sock < 0) |
1732 | return NULL; | |
1733 | c = channel_new("authentication agent connection", | |
1734 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1735 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
0d942eff | 1736 | "authentication agent connection", 1); |
a5f82435 | 1737 | c->force_drain = 1; |
fa08c86b | 1738 | return c; |
1739 | } | |
1740 | ||
0b242b12 | 1741 | /* XXXX move to generic input handler */ |
396c147e | 1742 | static void |
7819b5c3 | 1743 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 1744 | { |
1745 | Channel *c = NULL; | |
1746 | char *ctype; | |
0b242b12 | 1747 | int rchan; |
f91d9a89 | 1748 | u_int rmaxpack, rwindow, len; |
0b242b12 | 1749 | |
1750 | ctype = packet_get_string(&len); | |
1751 | rchan = packet_get_int(); | |
1752 | rwindow = packet_get_int(); | |
1753 | rmaxpack = packet_get_int(); | |
1754 | ||
1d1ffb87 | 1755 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
0b242b12 | 1756 | ctype, rchan, rwindow, rmaxpack); |
1757 | ||
fa08c86b | 1758 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
1759 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1760 | } else if (strcmp(ctype, "x11") == 0) { | |
1761 | c = client_request_x11(ctype, rchan); | |
1762 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1763 | c = client_request_agent(ctype, rchan); | |
0b242b12 | 1764 | } |
1765 | /* XXX duplicate : */ | |
1766 | if (c != NULL) { | |
1767 | debug("confirm %s", ctype); | |
1768 | c->remote_id = rchan; | |
1769 | c->remote_window = rwindow; | |
1770 | c->remote_maxpacket = rmaxpack; | |
a01a10dd | 1771 | if (c->type != SSH_CHANNEL_CONNECTING) { |
1772 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1773 | packet_put_int(c->remote_id); | |
1774 | packet_put_int(c->self); | |
1775 | packet_put_int(c->local_window); | |
1776 | packet_put_int(c->local_maxpacket); | |
1777 | packet_send(); | |
1778 | } | |
0b242b12 | 1779 | } else { |
1780 | debug("failure %s", ctype); | |
1781 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1782 | packet_put_int(rchan); | |
1783 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
fbe90f7b | 1784 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
a01a10dd | 1785 | packet_put_cstring("open failed"); |
fbe90f7b | 1786 | packet_put_cstring(""); |
1787 | } | |
0b242b12 | 1788 | packet_send(); |
1789 | } | |
1790 | xfree(ctype); | |
1791 | } | |
396c147e | 1792 | static void |
7819b5c3 | 1793 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
1fc8ccdf | 1794 | { |
1795 | Channel *c = NULL; | |
5e96b616 | 1796 | int exitval, id, reply, success = 0; |
1fc8ccdf | 1797 | char *rtype; |
1798 | ||
1799 | id = packet_get_int(); | |
1800 | rtype = packet_get_string(NULL); | |
1801 | reply = packet_get_char(); | |
1802 | ||
1803 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1804 | id, rtype, reply); | |
1805 | ||
13de3560 | 1806 | if (id == -1) { |
1807 | error("client_input_channel_req: request for channel -1"); | |
1808 | } else if ((c = channel_lookup(id)) == NULL) { | |
1fc8ccdf | 1809 | error("client_input_channel_req: channel %d: unknown channel", id); |
1810 | } else if (strcmp(rtype, "exit-status") == 0) { | |
5e96b616 | 1811 | exitval = packet_get_int(); |
1812 | if (id == session_ident) { | |
1813 | success = 1; | |
1814 | exit_status = exitval; | |
1815 | } else if (c->ctl_fd == -1) { | |
1816 | error("client_input_channel_req: unexpected channel %d", | |
1817 | session_ident); | |
1818 | } else { | |
1819 | atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval)); | |
1820 | success = 1; | |
1821 | } | |
95500969 | 1822 | packet_check_eom(); |
1fc8ccdf | 1823 | } |
1824 | if (reply) { | |
1825 | packet_start(success ? | |
1826 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
13de3560 | 1827 | packet_put_int(id); |
1fc8ccdf | 1828 | packet_send(); |
1829 | } | |
1830 | xfree(rtype); | |
1831 | } | |
3d209bbe | 1832 | static void |
1833 | client_input_global_request(int type, u_int32_t seq, void *ctxt) | |
1834 | { | |
1835 | char *rtype; | |
1836 | int want_reply; | |
1837 | int success = 0; | |
1838 | ||
1839 | rtype = packet_get_string(NULL); | |
1840 | want_reply = packet_get_char(); | |
5d8d32a3 | 1841 | debug("client_input_global_request: rtype %s want_reply %d", |
1842 | rtype, want_reply); | |
3d209bbe | 1843 | if (want_reply) { |
1844 | packet_start(success ? | |
1845 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1846 | packet_send(); | |
1847 | packet_write_wait(); | |
1848 | } | |
1849 | xfree(rtype); | |
1850 | } | |
0b242b12 | 1851 | |
5e96b616 | 1852 | void |
f2107e97 | 1853 | client_session2_setup(int id, int want_tty, int want_subsystem, |
1786be35 | 1854 | const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env, |
5e96b616 | 1855 | dispatch_fn *subsys_repl) |
1856 | { | |
1857 | int len; | |
2c9a4d41 | 1858 | Channel *c = NULL; |
5e96b616 | 1859 | |
1860 | debug2("%s: id %d", __func__, id); | |
1861 | ||
2c9a4d41 | 1862 | if ((c = channel_lookup(id)) == NULL) |
1863 | fatal("client_session2_setup: channel %d: unknown channel", id); | |
1864 | ||
5e96b616 | 1865 | if (want_tty) { |
1866 | struct winsize ws; | |
1867 | struct termios tio; | |
1868 | ||
1869 | /* Store window size in the packet. */ | |
1870 | if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) | |
1871 | memset(&ws, 0, sizeof(ws)); | |
1872 | ||
1873 | channel_request_start(id, "pty-req", 0); | |
1874 | packet_put_cstring(term != NULL ? term : ""); | |
1875 | packet_put_int(ws.ws_col); | |
1876 | packet_put_int(ws.ws_row); | |
1877 | packet_put_int(ws.ws_xpixel); | |
1878 | packet_put_int(ws.ws_ypixel); | |
1879 | tio = get_saved_tio(); | |
1880 | tty_make_modes(-1, tiop != NULL ? tiop : &tio); | |
1881 | packet_send(); | |
1882 | /* XXX wait for reply */ | |
2c9a4d41 | 1883 | c->client_tty = 1; |
5e96b616 | 1884 | } |
1885 | ||
1886 | /* Transfer any environment variables from client to server */ | |
1786be35 | 1887 | if (options.num_send_env != 0 && env != NULL) { |
5e96b616 | 1888 | int i, j, matched; |
5e96b616 | 1889 | char *name, *val; |
1890 | ||
1891 | debug("Sending environment."); | |
1786be35 | 1892 | for (i = 0; env[i] != NULL; i++) { |
5e96b616 | 1893 | /* Split */ |
1786be35 | 1894 | name = xstrdup(env[i]); |
5e96b616 | 1895 | if ((val = strchr(name, '=')) == NULL) { |
8c4bd764 | 1896 | xfree(name); |
5e96b616 | 1897 | continue; |
1898 | } | |
1899 | *val++ = '\0'; | |
1900 | ||
1901 | matched = 0; | |
1902 | for (j = 0; j < options.num_send_env; j++) { | |
1903 | if (match_pattern(name, options.send_env[j])) { | |
1904 | matched = 1; | |
1905 | break; | |
1906 | } | |
1907 | } | |
1908 | if (!matched) { | |
1909 | debug3("Ignored env %s", name); | |
8c4bd764 | 1910 | xfree(name); |
5e96b616 | 1911 | continue; |
1912 | } | |
1913 | ||
1914 | debug("Sending env %s = %s", name, val); | |
1915 | channel_request_start(id, "env", 0); | |
1916 | packet_put_cstring(name); | |
1917 | packet_put_cstring(val); | |
1918 | packet_send(); | |
8c4bd764 | 1919 | xfree(name); |
5e96b616 | 1920 | } |
1921 | } | |
1922 | ||
1923 | len = buffer_len(cmd); | |
1924 | if (len > 0) { | |
1925 | if (len > 900) | |
1926 | len = 900; | |
1927 | if (want_subsystem) { | |
1928 | debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1929 | channel_request_start(id, "subsystem", subsys_repl != NULL); | |
1930 | if (subsys_repl != NULL) { | |
1931 | /* register callback for reply */ | |
1932 | /* XXX we assume that client_loop has already been called */ | |
1933 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl); | |
1934 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl); | |
1935 | } | |
1936 | } else { | |
1937 | debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1938 | channel_request_start(id, "exec", 0); | |
1939 | } | |
1940 | packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); | |
1941 | packet_send(); | |
1942 | } else { | |
1943 | channel_request_start(id, "shell", 0); | |
1944 | packet_send(); | |
1945 | } | |
1946 | } | |
1947 | ||
396c147e | 1948 | static void |
5ca51e19 | 1949 | client_init_dispatch_20(void) |
8ce64345 | 1950 | { |
7a37c112 | 1951 | dispatch_init(&dispatch_protocol_error); |
e0ae8728 | 1952 | |
8ce64345 | 1953 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
1954 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1955 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1956 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
0b242b12 | 1957 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
8ce64345 | 1958 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1959 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1fc8ccdf | 1960 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
8ce64345 | 1961 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
3d209bbe | 1962 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
7a37c112 | 1963 | |
1964 | /* rekeying */ | |
1965 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
e0ae8728 | 1966 | |
1967 | /* global request reply messages */ | |
1968 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); | |
1969 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); | |
8ce64345 | 1970 | } |
396c147e | 1971 | static void |
5ca51e19 | 1972 | client_init_dispatch_13(void) |
7368a6c8 | 1973 | { |
1974 | dispatch_init(NULL); | |
1975 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1976 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1977 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
7368a6c8 | 1978 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1979 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1980 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
7368a6c8 | 1981 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
1982 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1983 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
a22aff1f | 1984 | |
1985 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
c15706e2 | 1986 | &client_input_agent_open : &deny_input_open); |
a22aff1f | 1987 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
1988 | &x11_input_open : &deny_input_open); | |
7368a6c8 | 1989 | } |
396c147e | 1990 | static void |
5ca51e19 | 1991 | client_init_dispatch_15(void) |
7368a6c8 | 1992 | { |
1993 | client_init_dispatch_13(); | |
1994 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1995 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1996 | } | |
eea46d13 | 1997 | static void |
5ca51e19 | 1998 | client_init_dispatch(void) |
7368a6c8 | 1999 | { |
8ce64345 | 2000 | if (compat20) |
2001 | client_init_dispatch_20(); | |
2002 | else if (compat13) | |
7368a6c8 | 2003 | client_init_dispatch_13(); |
2004 | else | |
2005 | client_init_dispatch_15(); | |
2006 | } | |
82de775c | 2007 | |
2008 | /* client specific fatal cleanup */ | |
2009 | void | |
2362db19 | 2010 | cleanup_exit(int i) |
82de775c | 2011 | { |
82de775c | 2012 | leave_raw_mode(); |
2013 | leave_non_blocking(); | |
5e96b616 | 2014 | if (options.control_path != NULL && control_fd != -1) |
2015 | unlink(options.control_path); | |
2362db19 | 2016 | _exit(i); |
82de775c | 2017 | } |