Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame^] | 1 | /* $OpenBSD: clientloop.c,v 1.236 2011/06/22 22:08:42 djm Exp $ */ |
| 2 | /* |
| 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
| 6 | * The main loop for the interactive session (client side). |
| 7 | * |
| 8 | * As far as I am concerned, the code I have written for this software |
| 9 | * can be used freely for any purpose. Any derived versions of this |
| 10 | * software must be clearly marked as such, and if the derived work is |
| 11 | * incompatible with the protocol description in the RFC file, it must be |
| 12 | * called by a name other than "ssh" or "Secure Shell". |
| 13 | * |
| 14 | * |
| 15 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. |
| 16 | * |
| 17 | * Redistribution and use in source and binary forms, with or without |
| 18 | * modification, are permitted provided that the following conditions |
| 19 | * are met: |
| 20 | * 1. Redistributions of source code must retain the above copyright |
| 21 | * notice, this list of conditions and the following disclaimer. |
| 22 | * 2. Redistributions in binary form must reproduce the above copyright |
| 23 | * notice, this list of conditions and the following disclaimer in the |
| 24 | * documentation and/or other materials provided with the distribution. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 27 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 28 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 29 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 30 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 31 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 32 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 33 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 34 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 35 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 36 | * |
| 37 | * |
| 38 | * SSH2 support added by Markus Friedl. |
| 39 | * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. |
| 40 | * |
| 41 | * Redistribution and use in source and binary forms, with or without |
| 42 | * modification, are permitted provided that the following conditions |
| 43 | * are met: |
| 44 | * 1. Redistributions of source code must retain the above copyright |
| 45 | * notice, this list of conditions and the following disclaimer. |
| 46 | * 2. Redistributions in binary form must reproduce the above copyright |
| 47 | * notice, this list of conditions and the following disclaimer in the |
| 48 | * documentation and/or other materials provided with the distribution. |
| 49 | * |
| 50 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 51 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 52 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 53 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 54 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 55 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 56 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 57 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 58 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 59 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 60 | */ |
| 61 | |
| 62 | #include "includes.h" |
| 63 | |
| 64 | #include <sys/types.h> |
| 65 | #include <sys/ioctl.h> |
| 66 | #include <sys/param.h> |
| 67 | #ifdef HAVE_SYS_STAT_H |
| 68 | # include <sys/stat.h> |
| 69 | #endif |
| 70 | #ifdef HAVE_SYS_TIME_H |
| 71 | # include <sys/time.h> |
| 72 | #endif |
| 73 | #include <sys/socket.h> |
| 74 | |
| 75 | #include <ctype.h> |
| 76 | #include <errno.h> |
| 77 | #ifdef HAVE_PATHS_H |
| 78 | #include <paths.h> |
| 79 | #endif |
| 80 | #include <signal.h> |
| 81 | #include <stdarg.h> |
| 82 | #include <stdio.h> |
| 83 | #include <stdlib.h> |
| 84 | #include <string.h> |
| 85 | #include <termios.h> |
| 86 | #include <pwd.h> |
| 87 | #include <unistd.h> |
| 88 | |
| 89 | #include "openbsd-compat/sys-queue.h" |
| 90 | #include "xmalloc.h" |
| 91 | #include "ssh.h" |
| 92 | #include "ssh1.h" |
| 93 | #include "ssh2.h" |
| 94 | #include "packet.h" |
| 95 | #include "buffer.h" |
| 96 | #include "compat.h" |
| 97 | #include "channels.h" |
| 98 | #include "dispatch.h" |
| 99 | #include "key.h" |
| 100 | #include "cipher.h" |
| 101 | #include "kex.h" |
| 102 | #include "log.h" |
| 103 | #include "readconf.h" |
| 104 | #include "clientloop.h" |
| 105 | #include "sshconnect.h" |
| 106 | #include "authfd.h" |
| 107 | #include "atomicio.h" |
| 108 | #include "sshpty.h" |
| 109 | #include "misc.h" |
| 110 | #include "match.h" |
| 111 | #include "msg.h" |
| 112 | #include "roaming.h" |
| 113 | |
| 114 | /* import options */ |
| 115 | extern Options options; |
| 116 | |
| 117 | /* Flag indicating that stdin should be redirected from /dev/null. */ |
| 118 | extern int stdin_null_flag; |
| 119 | |
| 120 | /* Flag indicating that no shell has been requested */ |
| 121 | extern int no_shell_flag; |
| 122 | |
| 123 | /* Control socket */ |
| 124 | extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */ |
| 125 | |
| 126 | /* |
| 127 | * Name of the host we are connecting to. This is the name given on the |
| 128 | * command line, or the HostName specified for the user-supplied name in a |
| 129 | * configuration file. |
| 130 | */ |
| 131 | extern char *host; |
| 132 | |
| 133 | /* |
| 134 | * Flag to indicate that we have received a window change signal which has |
| 135 | * not yet been processed. This will cause a message indicating the new |
| 136 | * window size to be sent to the server a little later. This is volatile |
| 137 | * because this is updated in a signal handler. |
| 138 | */ |
| 139 | static volatile sig_atomic_t received_window_change_signal = 0; |
| 140 | static volatile sig_atomic_t received_signal = 0; |
| 141 | |
| 142 | /* Flag indicating whether the user's terminal is in non-blocking mode. */ |
| 143 | static int in_non_blocking_mode = 0; |
| 144 | |
| 145 | /* Time when backgrounded control master using ControlPersist should exit */ |
| 146 | static time_t control_persist_exit_time = 0; |
| 147 | |
| 148 | /* Common data for the client loop code. */ |
| 149 | volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */ |
| 150 | static int escape_char1; /* Escape character. (proto1 only) */ |
| 151 | static int escape_pending1; /* Last character was an escape (proto1 only) */ |
| 152 | static int last_was_cr; /* Last character was a newline. */ |
| 153 | static int exit_status; /* Used to store the command exit status. */ |
| 154 | static int stdin_eof; /* EOF has been encountered on stderr. */ |
| 155 | static Buffer stdin_buffer; /* Buffer for stdin data. */ |
| 156 | static Buffer stdout_buffer; /* Buffer for stdout data. */ |
| 157 | static Buffer stderr_buffer; /* Buffer for stderr data. */ |
| 158 | static u_int buffer_high; /* Soft max buffer size. */ |
| 159 | static int connection_in; /* Connection to server (input). */ |
| 160 | static int connection_out; /* Connection to server (output). */ |
| 161 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ |
| 162 | static int session_closed; /* In SSH2: login session closed. */ |
| 163 | static int x11_refuse_time; /* If >0, refuse x11 opens after this time. */ |
| 164 | |
| 165 | static void client_init_dispatch(void); |
| 166 | int session_ident = -1; |
| 167 | |
| 168 | int session_resumed = 0; |
| 169 | |
| 170 | /* Track escape per proto2 channel */ |
| 171 | struct escape_filter_ctx { |
| 172 | int escape_pending; |
| 173 | int escape_char; |
| 174 | }; |
| 175 | |
| 176 | /* Context for channel confirmation replies */ |
| 177 | struct channel_reply_ctx { |
| 178 | const char *request_type; |
| 179 | int id; |
| 180 | enum confirm_action action; |
| 181 | }; |
| 182 | |
| 183 | /* Global request success/failure callbacks */ |
| 184 | struct global_confirm { |
| 185 | TAILQ_ENTRY(global_confirm) entry; |
| 186 | global_confirm_cb *cb; |
| 187 | void *ctx; |
| 188 | int ref_count; |
| 189 | }; |
| 190 | TAILQ_HEAD(global_confirms, global_confirm); |
| 191 | static struct global_confirms global_confirms = |
| 192 | TAILQ_HEAD_INITIALIZER(global_confirms); |
| 193 | |
| 194 | /*XXX*/ |
| 195 | extern Kex *xxx_kex; |
| 196 | |
| 197 | void ssh_process_session2_setup(int, int, int, Buffer *); |
| 198 | |
| 199 | /* Restores stdin to blocking mode. */ |
| 200 | |
| 201 | static void |
| 202 | leave_non_blocking(void) |
| 203 | { |
| 204 | if (in_non_blocking_mode) { |
| 205 | unset_nonblock(fileno(stdin)); |
| 206 | in_non_blocking_mode = 0; |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | /* Puts stdin terminal in non-blocking mode. */ |
| 211 | |
| 212 | static void |
| 213 | enter_non_blocking(void) |
| 214 | { |
| 215 | in_non_blocking_mode = 1; |
| 216 | set_nonblock(fileno(stdin)); |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * Signal handler for the window change signal (SIGWINCH). This just sets a |
| 221 | * flag indicating that the window has changed. |
| 222 | */ |
| 223 | /*ARGSUSED */ |
| 224 | static void |
| 225 | window_change_handler(int sig) |
| 226 | { |
| 227 | received_window_change_signal = 1; |
| 228 | signal(SIGWINCH, window_change_handler); |
| 229 | } |
| 230 | |
| 231 | /* |
| 232 | * Signal handler for signals that cause the program to terminate. These |
| 233 | * signals must be trapped to restore terminal modes. |
| 234 | */ |
| 235 | /*ARGSUSED */ |
| 236 | static void |
| 237 | signal_handler(int sig) |
| 238 | { |
| 239 | received_signal = sig; |
| 240 | quit_pending = 1; |
| 241 | } |
| 242 | |
| 243 | /* |
| 244 | * Returns current time in seconds from Jan 1, 1970 with the maximum |
| 245 | * available resolution. |
| 246 | */ |
| 247 | |
| 248 | static double |
| 249 | get_current_time(void) |
| 250 | { |
| 251 | struct timeval tv; |
| 252 | gettimeofday(&tv, NULL); |
| 253 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; |
| 254 | } |
| 255 | |
| 256 | /* |
| 257 | * Sets control_persist_exit_time to the absolute time when the |
| 258 | * backgrounded control master should exit due to expiry of the |
| 259 | * ControlPersist timeout. Sets it to 0 if we are not a backgrounded |
| 260 | * control master process, or if there is no ControlPersist timeout. |
| 261 | */ |
| 262 | static void |
| 263 | set_control_persist_exit_time(void) |
| 264 | { |
| 265 | if (muxserver_sock == -1 || !options.control_persist |
| 266 | || options.control_persist_timeout == 0) { |
| 267 | /* not using a ControlPersist timeout */ |
| 268 | control_persist_exit_time = 0; |
| 269 | } else if (channel_still_open()) { |
| 270 | /* some client connections are still open */ |
| 271 | if (control_persist_exit_time > 0) |
| 272 | debug2("%s: cancel scheduled exit", __func__); |
| 273 | control_persist_exit_time = 0; |
| 274 | } else if (control_persist_exit_time <= 0) { |
| 275 | /* a client connection has recently closed */ |
| 276 | control_persist_exit_time = time(NULL) + |
| 277 | (time_t)options.control_persist_timeout; |
| 278 | debug2("%s: schedule exit in %d seconds", __func__, |
| 279 | options.control_persist_timeout); |
| 280 | } |
| 281 | /* else we are already counting down to the timeout */ |
| 282 | } |
| 283 | |
| 284 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
| 285 | void |
| 286 | client_x11_get_proto(const char *display, const char *xauth_path, |
| 287 | u_int trusted, u_int timeout, char **_proto, char **_data) |
| 288 | { |
| 289 | char cmd[1024]; |
| 290 | char line[512]; |
| 291 | char xdisplay[512]; |
| 292 | static char proto[512], data[512]; |
| 293 | FILE *f; |
| 294 | int got_data = 0, generated = 0, do_unlink = 0, i; |
| 295 | char *xauthdir, *xauthfile; |
| 296 | struct stat st; |
| 297 | u_int now; |
| 298 | |
| 299 | xauthdir = xauthfile = NULL; |
| 300 | *_proto = proto; |
| 301 | *_data = data; |
| 302 | proto[0] = data[0] = '\0'; |
| 303 | |
| 304 | if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { |
| 305 | debug("No xauth program."); |
| 306 | } else { |
| 307 | if (display == NULL) { |
| 308 | debug("x11_get_proto: DISPLAY not set"); |
| 309 | return; |
| 310 | } |
| 311 | /* |
| 312 | * Handle FamilyLocal case where $DISPLAY does |
| 313 | * not match an authorization entry. For this we |
| 314 | * just try "xauth list unix:displaynum.screennum". |
| 315 | * XXX: "localhost" match to determine FamilyLocal |
| 316 | * is not perfect. |
| 317 | */ |
| 318 | if (strncmp(display, "localhost:", 10) == 0) { |
| 319 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", |
| 320 | display + 10); |
| 321 | display = xdisplay; |
| 322 | } |
| 323 | if (trusted == 0) { |
| 324 | xauthdir = xmalloc(MAXPATHLEN); |
| 325 | xauthfile = xmalloc(MAXPATHLEN); |
| 326 | mktemp_proto(xauthdir, MAXPATHLEN); |
| 327 | if (mkdtemp(xauthdir) != NULL) { |
| 328 | do_unlink = 1; |
| 329 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", |
| 330 | xauthdir); |
| 331 | snprintf(cmd, sizeof(cmd), |
| 332 | "%s -f %s generate %s " SSH_X11_PROTO |
| 333 | " untrusted timeout %u 2>" _PATH_DEVNULL, |
| 334 | xauth_path, xauthfile, display, timeout); |
| 335 | debug2("x11_get_proto: %s", cmd); |
| 336 | if (system(cmd) == 0) |
| 337 | generated = 1; |
| 338 | if (x11_refuse_time == 0) { |
| 339 | now = time(NULL) + 1; |
| 340 | if (UINT_MAX - timeout < now) |
| 341 | x11_refuse_time = UINT_MAX; |
| 342 | else |
| 343 | x11_refuse_time = now + timeout; |
| 344 | } |
| 345 | } |
| 346 | } |
| 347 | |
| 348 | /* |
| 349 | * When in untrusted mode, we read the cookie only if it was |
| 350 | * successfully generated as an untrusted one in the step |
| 351 | * above. |
| 352 | */ |
| 353 | if (trusted || generated) { |
| 354 | snprintf(cmd, sizeof(cmd), |
| 355 | "%s %s%s list %s 2>" _PATH_DEVNULL, |
| 356 | xauth_path, |
| 357 | generated ? "-f " : "" , |
| 358 | generated ? xauthfile : "", |
| 359 | display); |
| 360 | debug2("x11_get_proto: %s", cmd); |
| 361 | f = popen(cmd, "r"); |
| 362 | if (f && fgets(line, sizeof(line), f) && |
| 363 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
| 364 | got_data = 1; |
| 365 | if (f) |
| 366 | pclose(f); |
| 367 | } else |
| 368 | error("Warning: untrusted X11 forwarding setup failed: " |
| 369 | "xauth key data not generated"); |
| 370 | } |
| 371 | |
| 372 | if (do_unlink) { |
| 373 | unlink(xauthfile); |
| 374 | rmdir(xauthdir); |
| 375 | } |
| 376 | if (xauthdir) |
| 377 | xfree(xauthdir); |
| 378 | if (xauthfile) |
| 379 | xfree(xauthfile); |
| 380 | |
| 381 | /* |
| 382 | * If we didn't get authentication data, just make up some |
| 383 | * data. The forwarding code will check the validity of the |
| 384 | * response anyway, and substitute this data. The X11 |
| 385 | * server, however, will ignore this fake data and use |
| 386 | * whatever authentication mechanisms it was using otherwise |
| 387 | * for the local connection. |
| 388 | */ |
| 389 | if (!got_data) { |
| 390 | u_int32_t rnd = 0; |
| 391 | |
| 392 | logit("Warning: No xauth data; " |
| 393 | "using fake authentication data for X11 forwarding."); |
| 394 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); |
| 395 | for (i = 0; i < 16; i++) { |
| 396 | if (i % 4 == 0) |
| 397 | rnd = arc4random(); |
| 398 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", |
| 399 | rnd & 0xff); |
| 400 | rnd >>= 8; |
| 401 | } |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | /* |
| 406 | * This is called when the interactive is entered. This checks if there is |
| 407 | * an EOF coming on stdin. We must check this explicitly, as select() does |
| 408 | * not appear to wake up when redirecting from /dev/null. |
| 409 | */ |
| 410 | |
| 411 | static void |
| 412 | client_check_initial_eof_on_stdin(void) |
| 413 | { |
| 414 | int len; |
| 415 | char buf[1]; |
| 416 | |
| 417 | /* |
| 418 | * If standard input is to be "redirected from /dev/null", we simply |
| 419 | * mark that we have seen an EOF and send an EOF message to the |
| 420 | * server. Otherwise, we try to read a single character; it appears |
| 421 | * that for some files, such /dev/null, select() never wakes up for |
| 422 | * read for this descriptor, which means that we never get EOF. This |
| 423 | * way we will get the EOF if stdin comes from /dev/null or similar. |
| 424 | */ |
| 425 | if (stdin_null_flag) { |
| 426 | /* Fake EOF on stdin. */ |
| 427 | debug("Sending eof."); |
| 428 | stdin_eof = 1; |
| 429 | packet_start(SSH_CMSG_EOF); |
| 430 | packet_send(); |
| 431 | } else { |
| 432 | enter_non_blocking(); |
| 433 | |
| 434 | /* Check for immediate EOF on stdin. */ |
| 435 | len = read(fileno(stdin), buf, 1); |
| 436 | if (len == 0) { |
| 437 | /* |
| 438 | * EOF. Record that we have seen it and send |
| 439 | * EOF to server. |
| 440 | */ |
| 441 | debug("Sending eof."); |
| 442 | stdin_eof = 1; |
| 443 | packet_start(SSH_CMSG_EOF); |
| 444 | packet_send(); |
| 445 | } else if (len > 0) { |
| 446 | /* |
| 447 | * Got data. We must store the data in the buffer, |
| 448 | * and also process it as an escape character if |
| 449 | * appropriate. |
| 450 | */ |
| 451 | if ((u_char) buf[0] == escape_char1) |
| 452 | escape_pending1 = 1; |
| 453 | else |
| 454 | buffer_append(&stdin_buffer, buf, 1); |
| 455 | } |
| 456 | leave_non_blocking(); |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | |
| 461 | /* |
| 462 | * Make packets from buffered stdin data, and buffer them for sending to the |
| 463 | * connection. |
| 464 | */ |
| 465 | |
| 466 | static void |
| 467 | client_make_packets_from_stdin_data(void) |
| 468 | { |
| 469 | u_int len; |
| 470 | |
| 471 | /* Send buffered stdin data to the server. */ |
| 472 | while (buffer_len(&stdin_buffer) > 0 && |
| 473 | packet_not_very_much_data_to_write()) { |
| 474 | len = buffer_len(&stdin_buffer); |
| 475 | /* Keep the packets at reasonable size. */ |
| 476 | if (len > packet_get_maxsize()) |
| 477 | len = packet_get_maxsize(); |
| 478 | packet_start(SSH_CMSG_STDIN_DATA); |
| 479 | packet_put_string(buffer_ptr(&stdin_buffer), len); |
| 480 | packet_send(); |
| 481 | buffer_consume(&stdin_buffer, len); |
| 482 | /* If we have a pending EOF, send it now. */ |
| 483 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { |
| 484 | packet_start(SSH_CMSG_EOF); |
| 485 | packet_send(); |
| 486 | } |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | /* |
| 491 | * Checks if the client window has changed, and sends a packet about it to |
| 492 | * the server if so. The actual change is detected elsewhere (by a software |
| 493 | * interrupt on Unix); this just checks the flag and sends a message if |
| 494 | * appropriate. |
| 495 | */ |
| 496 | |
| 497 | static void |
| 498 | client_check_window_change(void) |
| 499 | { |
| 500 | struct winsize ws; |
| 501 | |
| 502 | if (! received_window_change_signal) |
| 503 | return; |
| 504 | /** XXX race */ |
| 505 | received_window_change_signal = 0; |
| 506 | |
| 507 | debug2("client_check_window_change: changed"); |
| 508 | |
| 509 | if (compat20) { |
| 510 | channel_send_window_changes(); |
| 511 | } else { |
| 512 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
| 513 | return; |
| 514 | packet_start(SSH_CMSG_WINDOW_SIZE); |
| 515 | packet_put_int((u_int)ws.ws_row); |
| 516 | packet_put_int((u_int)ws.ws_col); |
| 517 | packet_put_int((u_int)ws.ws_xpixel); |
| 518 | packet_put_int((u_int)ws.ws_ypixel); |
| 519 | packet_send(); |
| 520 | } |
| 521 | } |
| 522 | |
| 523 | static void |
| 524 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) |
| 525 | { |
| 526 | struct global_confirm *gc; |
| 527 | |
| 528 | if ((gc = TAILQ_FIRST(&global_confirms)) == NULL) |
| 529 | return; |
| 530 | if (gc->cb != NULL) |
| 531 | gc->cb(type, seq, gc->ctx); |
| 532 | if (--gc->ref_count <= 0) { |
| 533 | TAILQ_REMOVE(&global_confirms, gc, entry); |
| 534 | bzero(gc, sizeof(*gc)); |
| 535 | xfree(gc); |
| 536 | } |
| 537 | |
| 538 | packet_set_alive_timeouts(0); |
| 539 | } |
| 540 | |
| 541 | static void |
| 542 | server_alive_check(void) |
| 543 | { |
| 544 | if (packet_inc_alive_timeouts() > options.server_alive_count_max) { |
| 545 | logit("Timeout, server %s not responding.", host); |
| 546 | cleanup_exit(255); |
| 547 | } |
| 548 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 549 | packet_put_cstring("keepalive@openssh.com"); |
| 550 | packet_put_char(1); /* boolean: want reply */ |
| 551 | packet_send(); |
| 552 | /* Insert an empty placeholder to maintain ordering */ |
| 553 | client_register_global_confirm(NULL, NULL); |
| 554 | } |
| 555 | |
| 556 | /* |
| 557 | * Waits until the client can do something (some data becomes available on |
| 558 | * one of the file descriptors). |
| 559 | */ |
| 560 | static void |
| 561 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
| 562 | int *maxfdp, u_int *nallocp, int rekeying) |
| 563 | { |
| 564 | struct timeval tv, *tvp; |
| 565 | int timeout_secs; |
| 566 | int ret; |
| 567 | |
| 568 | /* Add any selections by the channel mechanism. */ |
| 569 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); |
| 570 | |
| 571 | if (!compat20) { |
| 572 | /* Read from the connection, unless our buffers are full. */ |
| 573 | if (buffer_len(&stdout_buffer) < buffer_high && |
| 574 | buffer_len(&stderr_buffer) < buffer_high && |
| 575 | channel_not_very_much_buffered_data()) |
| 576 | FD_SET(connection_in, *readsetp); |
| 577 | /* |
| 578 | * Read from stdin, unless we have seen EOF or have very much |
| 579 | * buffered data to send to the server. |
| 580 | */ |
| 581 | if (!stdin_eof && packet_not_very_much_data_to_write()) |
| 582 | FD_SET(fileno(stdin), *readsetp); |
| 583 | |
| 584 | /* Select stdout/stderr if have data in buffer. */ |
| 585 | if (buffer_len(&stdout_buffer) > 0) |
| 586 | FD_SET(fileno(stdout), *writesetp); |
| 587 | if (buffer_len(&stderr_buffer) > 0) |
| 588 | FD_SET(fileno(stderr), *writesetp); |
| 589 | } else { |
| 590 | /* channel_prepare_select could have closed the last channel */ |
| 591 | if (session_closed && !channel_still_open() && |
| 592 | !packet_have_data_to_write()) { |
| 593 | /* clear mask since we did not call select() */ |
| 594 | memset(*readsetp, 0, *nallocp); |
| 595 | memset(*writesetp, 0, *nallocp); |
| 596 | return; |
| 597 | } else { |
| 598 | FD_SET(connection_in, *readsetp); |
| 599 | } |
| 600 | } |
| 601 | |
| 602 | /* Select server connection if have data to write to the server. */ |
| 603 | if (packet_have_data_to_write()) |
| 604 | FD_SET(connection_out, *writesetp); |
| 605 | |
| 606 | /* |
| 607 | * Wait for something to happen. This will suspend the process until |
| 608 | * some selected descriptor can be read, written, or has some other |
| 609 | * event pending, or a timeout expires. |
| 610 | */ |
| 611 | |
| 612 | timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */ |
| 613 | if (options.server_alive_interval > 0 && compat20) |
| 614 | timeout_secs = options.server_alive_interval; |
| 615 | set_control_persist_exit_time(); |
| 616 | if (control_persist_exit_time > 0) { |
| 617 | timeout_secs = MIN(timeout_secs, |
| 618 | control_persist_exit_time - time(NULL)); |
| 619 | if (timeout_secs < 0) |
| 620 | timeout_secs = 0; |
| 621 | } |
| 622 | if (timeout_secs == INT_MAX) |
| 623 | tvp = NULL; |
| 624 | else { |
| 625 | tv.tv_sec = timeout_secs; |
| 626 | tv.tv_usec = 0; |
| 627 | tvp = &tv; |
| 628 | } |
| 629 | |
| 630 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); |
| 631 | if (ret < 0) { |
| 632 | char buf[100]; |
| 633 | |
| 634 | /* |
| 635 | * We have to clear the select masks, because we return. |
| 636 | * We have to return, because the mainloop checks for the flags |
| 637 | * set by the signal handlers. |
| 638 | */ |
| 639 | memset(*readsetp, 0, *nallocp); |
| 640 | memset(*writesetp, 0, *nallocp); |
| 641 | |
| 642 | if (errno == EINTR) |
| 643 | return; |
| 644 | /* Note: we might still have data in the buffers. */ |
| 645 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); |
| 646 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 647 | quit_pending = 1; |
| 648 | } else if (ret == 0) |
| 649 | server_alive_check(); |
| 650 | } |
| 651 | |
| 652 | static void |
| 653 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
| 654 | { |
| 655 | /* Flush stdout and stderr buffers. */ |
| 656 | if (buffer_len(bout) > 0) |
| 657 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), |
| 658 | buffer_len(bout)); |
| 659 | if (buffer_len(berr) > 0) |
| 660 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), |
| 661 | buffer_len(berr)); |
| 662 | |
| 663 | leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| 664 | |
| 665 | /* |
| 666 | * Free (and clear) the buffer to reduce the amount of data that gets |
| 667 | * written to swap. |
| 668 | */ |
| 669 | buffer_free(bin); |
| 670 | buffer_free(bout); |
| 671 | buffer_free(berr); |
| 672 | |
| 673 | /* Send the suspend signal to the program itself. */ |
| 674 | kill(getpid(), SIGTSTP); |
| 675 | |
| 676 | /* Reset window sizes in case they have changed */ |
| 677 | received_window_change_signal = 1; |
| 678 | |
| 679 | /* OK, we have been continued by the user. Reinitialize buffers. */ |
| 680 | buffer_init(bin); |
| 681 | buffer_init(bout); |
| 682 | buffer_init(berr); |
| 683 | |
| 684 | enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| 685 | } |
| 686 | |
| 687 | static void |
| 688 | client_process_net_input(fd_set *readset) |
| 689 | { |
| 690 | int len, cont = 0; |
| 691 | char buf[SSH_IOBUFSZ]; |
| 692 | |
| 693 | /* |
| 694 | * Read input from the server, and add any such data to the buffer of |
| 695 | * the packet subsystem. |
| 696 | */ |
| 697 | if (FD_ISSET(connection_in, readset)) { |
| 698 | /* Read as much as possible. */ |
| 699 | len = roaming_read(connection_in, buf, sizeof(buf), &cont); |
| 700 | if (len == 0 && cont == 0) { |
| 701 | /* |
| 702 | * Received EOF. The remote host has closed the |
| 703 | * connection. |
| 704 | */ |
| 705 | snprintf(buf, sizeof buf, |
| 706 | "Connection to %.300s closed by remote host.\r\n", |
| 707 | host); |
| 708 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 709 | quit_pending = 1; |
| 710 | return; |
| 711 | } |
| 712 | /* |
| 713 | * There is a kernel bug on Solaris that causes select to |
| 714 | * sometimes wake up even though there is no data available. |
| 715 | */ |
| 716 | if (len < 0 && |
| 717 | (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) |
| 718 | len = 0; |
| 719 | |
| 720 | if (len < 0) { |
| 721 | /* |
| 722 | * An error has encountered. Perhaps there is a |
| 723 | * network problem. |
| 724 | */ |
| 725 | snprintf(buf, sizeof buf, |
| 726 | "Read from remote host %.300s: %.100s\r\n", |
| 727 | host, strerror(errno)); |
| 728 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 729 | quit_pending = 1; |
| 730 | return; |
| 731 | } |
| 732 | packet_process_incoming(buf, len); |
| 733 | } |
| 734 | } |
| 735 | |
| 736 | static void |
| 737 | client_status_confirm(int type, Channel *c, void *ctx) |
| 738 | { |
| 739 | struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx; |
| 740 | char errmsg[256]; |
| 741 | int tochan; |
| 742 | |
| 743 | /* |
| 744 | * If a TTY was explicitly requested, then a failure to allocate |
| 745 | * one is fatal. |
| 746 | */ |
| 747 | if (cr->action == CONFIRM_TTY && |
| 748 | (options.request_tty == REQUEST_TTY_FORCE || |
| 749 | options.request_tty == REQUEST_TTY_YES)) |
| 750 | cr->action = CONFIRM_CLOSE; |
| 751 | |
| 752 | /* XXX supress on mux _client_ quietmode */ |
| 753 | tochan = options.log_level >= SYSLOG_LEVEL_ERROR && |
| 754 | c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE; |
| 755 | |
| 756 | if (type == SSH2_MSG_CHANNEL_SUCCESS) { |
| 757 | debug2("%s request accepted on channel %d", |
| 758 | cr->request_type, c->self); |
| 759 | } else if (type == SSH2_MSG_CHANNEL_FAILURE) { |
| 760 | if (tochan) { |
| 761 | snprintf(errmsg, sizeof(errmsg), |
| 762 | "%s request failed\r\n", cr->request_type); |
| 763 | } else { |
| 764 | snprintf(errmsg, sizeof(errmsg), |
| 765 | "%s request failed on channel %d", |
| 766 | cr->request_type, c->self); |
| 767 | } |
| 768 | /* If error occurred on primary session channel, then exit */ |
| 769 | if (cr->action == CONFIRM_CLOSE && c->self == session_ident) |
| 770 | fatal("%s", errmsg); |
| 771 | /* |
| 772 | * If error occurred on mux client, append to |
| 773 | * their stderr. |
| 774 | */ |
| 775 | if (tochan) { |
| 776 | buffer_append(&c->extended, errmsg, |
| 777 | strlen(errmsg)); |
| 778 | } else |
| 779 | error("%s", errmsg); |
| 780 | if (cr->action == CONFIRM_TTY) { |
| 781 | /* |
| 782 | * If a TTY allocation error occurred, then arrange |
| 783 | * for the correct TTY to leave raw mode. |
| 784 | */ |
| 785 | if (c->self == session_ident) |
| 786 | leave_raw_mode(0); |
| 787 | else |
| 788 | mux_tty_alloc_failed(c); |
| 789 | } else if (cr->action == CONFIRM_CLOSE) { |
| 790 | chan_read_failed(c); |
| 791 | chan_write_failed(c); |
| 792 | } |
| 793 | } |
| 794 | xfree(cr); |
| 795 | } |
| 796 | |
| 797 | static void |
| 798 | client_abandon_status_confirm(Channel *c, void *ctx) |
| 799 | { |
| 800 | xfree(ctx); |
| 801 | } |
| 802 | |
| 803 | void |
| 804 | client_expect_confirm(int id, const char *request, |
| 805 | enum confirm_action action) |
| 806 | { |
| 807 | struct channel_reply_ctx *cr = xmalloc(sizeof(*cr)); |
| 808 | |
| 809 | cr->request_type = request; |
| 810 | cr->action = action; |
| 811 | |
| 812 | channel_register_status_confirm(id, client_status_confirm, |
| 813 | client_abandon_status_confirm, cr); |
| 814 | } |
| 815 | |
| 816 | void |
| 817 | client_register_global_confirm(global_confirm_cb *cb, void *ctx) |
| 818 | { |
| 819 | struct global_confirm *gc, *last_gc; |
| 820 | |
| 821 | /* Coalesce identical callbacks */ |
| 822 | last_gc = TAILQ_LAST(&global_confirms, global_confirms); |
| 823 | if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) { |
| 824 | if (++last_gc->ref_count >= INT_MAX) |
| 825 | fatal("%s: last_gc->ref_count = %d", |
| 826 | __func__, last_gc->ref_count); |
| 827 | return; |
| 828 | } |
| 829 | |
| 830 | gc = xmalloc(sizeof(*gc)); |
| 831 | gc->cb = cb; |
| 832 | gc->ctx = ctx; |
| 833 | gc->ref_count = 1; |
| 834 | TAILQ_INSERT_TAIL(&global_confirms, gc, entry); |
| 835 | } |
| 836 | |
| 837 | static void |
| 838 | process_cmdline(void) |
| 839 | { |
| 840 | void (*handler)(int); |
| 841 | char *s, *cmd, *cancel_host; |
| 842 | int delete = 0; |
| 843 | int local = 0, remote = 0, dynamic = 0; |
| 844 | int cancel_port; |
| 845 | Forward fwd; |
| 846 | |
| 847 | bzero(&fwd, sizeof(fwd)); |
| 848 | fwd.listen_host = fwd.connect_host = NULL; |
| 849 | |
| 850 | leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| 851 | handler = signal(SIGINT, SIG_IGN); |
| 852 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
| 853 | if (s == NULL) |
| 854 | goto out; |
| 855 | while (isspace(*s)) |
| 856 | s++; |
| 857 | if (*s == '-') |
| 858 | s++; /* Skip cmdline '-', if any */ |
| 859 | if (*s == '\0') |
| 860 | goto out; |
| 861 | |
| 862 | if (*s == 'h' || *s == 'H' || *s == '?') { |
| 863 | logit("Commands:"); |
| 864 | logit(" -L[bind_address:]port:host:hostport " |
| 865 | "Request local forward"); |
| 866 | logit(" -R[bind_address:]port:host:hostport " |
| 867 | "Request remote forward"); |
| 868 | logit(" -D[bind_address:]port " |
| 869 | "Request dynamic forward"); |
| 870 | logit(" -KR[bind_address:]port " |
| 871 | "Cancel remote forward"); |
| 872 | if (!options.permit_local_command) |
| 873 | goto out; |
| 874 | logit(" !args " |
| 875 | "Execute local command"); |
| 876 | goto out; |
| 877 | } |
| 878 | |
| 879 | if (*s == '!' && options.permit_local_command) { |
| 880 | s++; |
| 881 | ssh_local_cmd(s); |
| 882 | goto out; |
| 883 | } |
| 884 | |
| 885 | if (*s == 'K') { |
| 886 | delete = 1; |
| 887 | s++; |
| 888 | } |
| 889 | if (*s == 'L') |
| 890 | local = 1; |
| 891 | else if (*s == 'R') |
| 892 | remote = 1; |
| 893 | else if (*s == 'D') |
| 894 | dynamic = 1; |
| 895 | else { |
| 896 | logit("Invalid command."); |
| 897 | goto out; |
| 898 | } |
| 899 | |
| 900 | if ((local || dynamic) && delete) { |
| 901 | logit("Not supported."); |
| 902 | goto out; |
| 903 | } |
| 904 | if (remote && delete && !compat20) { |
| 905 | logit("Not supported for SSH protocol version 1."); |
| 906 | goto out; |
| 907 | } |
| 908 | |
| 909 | while (isspace(*++s)) |
| 910 | ; |
| 911 | |
| 912 | /* XXX update list of forwards in options */ |
| 913 | if (delete) { |
| 914 | cancel_port = 0; |
| 915 | cancel_host = hpdelim(&s); /* may be NULL */ |
| 916 | if (s != NULL) { |
| 917 | cancel_port = a2port(s); |
| 918 | cancel_host = cleanhostname(cancel_host); |
| 919 | } else { |
| 920 | cancel_port = a2port(cancel_host); |
| 921 | cancel_host = NULL; |
| 922 | } |
| 923 | if (cancel_port <= 0) { |
| 924 | logit("Bad forwarding close port"); |
| 925 | goto out; |
| 926 | } |
| 927 | channel_request_rforward_cancel(cancel_host, cancel_port); |
| 928 | } else { |
| 929 | if (!parse_forward(&fwd, s, dynamic, remote)) { |
| 930 | logit("Bad forwarding specification."); |
| 931 | goto out; |
| 932 | } |
| 933 | if (local || dynamic) { |
| 934 | if (channel_setup_local_fwd_listener(fwd.listen_host, |
| 935 | fwd.listen_port, fwd.connect_host, |
| 936 | fwd.connect_port, options.gateway_ports) < 0) { |
| 937 | logit("Port forwarding failed."); |
| 938 | goto out; |
| 939 | } |
| 940 | } else { |
| 941 | if (channel_request_remote_forwarding(fwd.listen_host, |
| 942 | fwd.listen_port, fwd.connect_host, |
| 943 | fwd.connect_port) < 0) { |
| 944 | logit("Port forwarding failed."); |
| 945 | goto out; |
| 946 | } |
| 947 | } |
| 948 | |
| 949 | logit("Forwarding port."); |
| 950 | } |
| 951 | |
| 952 | out: |
| 953 | signal(SIGINT, handler); |
| 954 | enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| 955 | if (cmd) |
| 956 | xfree(cmd); |
| 957 | if (fwd.listen_host != NULL) |
| 958 | xfree(fwd.listen_host); |
| 959 | if (fwd.connect_host != NULL) |
| 960 | xfree(fwd.connect_host); |
| 961 | } |
| 962 | |
| 963 | /* |
| 964 | * Process the characters one by one, call with c==NULL for proto1 case. |
| 965 | */ |
| 966 | static int |
| 967 | process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr, |
| 968 | char *buf, int len) |
| 969 | { |
| 970 | char string[1024]; |
| 971 | pid_t pid; |
| 972 | int bytes = 0; |
| 973 | u_int i; |
| 974 | u_char ch; |
| 975 | char *s; |
| 976 | int *escape_pendingp, escape_char; |
| 977 | struct escape_filter_ctx *efc; |
| 978 | |
| 979 | if (c == NULL) { |
| 980 | escape_pendingp = &escape_pending1; |
| 981 | escape_char = escape_char1; |
| 982 | } else { |
| 983 | if (c->filter_ctx == NULL) |
| 984 | return 0; |
| 985 | efc = (struct escape_filter_ctx *)c->filter_ctx; |
| 986 | escape_pendingp = &efc->escape_pending; |
| 987 | escape_char = efc->escape_char; |
| 988 | } |
| 989 | |
| 990 | if (len <= 0) |
| 991 | return (0); |
| 992 | |
| 993 | for (i = 0; i < (u_int)len; i++) { |
| 994 | /* Get one character at a time. */ |
| 995 | ch = buf[i]; |
| 996 | |
| 997 | if (*escape_pendingp) { |
| 998 | /* We have previously seen an escape character. */ |
| 999 | /* Clear the flag now. */ |
| 1000 | *escape_pendingp = 0; |
| 1001 | |
| 1002 | /* Process the escaped character. */ |
| 1003 | switch (ch) { |
| 1004 | case '.': |
| 1005 | /* Terminate the connection. */ |
| 1006 | snprintf(string, sizeof string, "%c.\r\n", |
| 1007 | escape_char); |
| 1008 | buffer_append(berr, string, strlen(string)); |
| 1009 | |
| 1010 | if (c && c->ctl_chan != -1) { |
| 1011 | chan_read_failed(c); |
| 1012 | chan_write_failed(c); |
| 1013 | return 0; |
| 1014 | } else |
| 1015 | quit_pending = 1; |
| 1016 | return -1; |
| 1017 | |
| 1018 | case 'Z' - 64: |
| 1019 | /* XXX support this for mux clients */ |
| 1020 | if (c && c->ctl_chan != -1) { |
| 1021 | noescape: |
| 1022 | snprintf(string, sizeof string, |
| 1023 | "%c%c escape not available to " |
| 1024 | "multiplexed sessions\r\n", |
| 1025 | escape_char, ch); |
| 1026 | buffer_append(berr, string, |
| 1027 | strlen(string)); |
| 1028 | continue; |
| 1029 | } |
| 1030 | /* Suspend the program. Inform the user */ |
| 1031 | snprintf(string, sizeof string, |
| 1032 | "%c^Z [suspend ssh]\r\n", escape_char); |
| 1033 | buffer_append(berr, string, strlen(string)); |
| 1034 | |
| 1035 | /* Restore terminal modes and suspend. */ |
| 1036 | client_suspend_self(bin, bout, berr); |
| 1037 | |
| 1038 | /* We have been continued. */ |
| 1039 | continue; |
| 1040 | |
| 1041 | case 'B': |
| 1042 | if (compat20) { |
| 1043 | snprintf(string, sizeof string, |
| 1044 | "%cB\r\n", escape_char); |
| 1045 | buffer_append(berr, string, |
| 1046 | strlen(string)); |
| 1047 | channel_request_start(session_ident, |
| 1048 | "break", 0); |
| 1049 | packet_put_int(1000); |
| 1050 | packet_send(); |
| 1051 | } |
| 1052 | continue; |
| 1053 | |
| 1054 | case 'R': |
| 1055 | if (compat20) { |
| 1056 | if (datafellows & SSH_BUG_NOREKEY) |
| 1057 | logit("Server does not " |
| 1058 | "support re-keying"); |
| 1059 | else |
| 1060 | need_rekeying = 1; |
| 1061 | } |
| 1062 | continue; |
| 1063 | |
| 1064 | case '&': |
| 1065 | if (c && c->ctl_chan != -1) |
| 1066 | goto noescape; |
| 1067 | /* |
| 1068 | * Detach the program (continue to serve |
| 1069 | * connections, but put in background and no |
| 1070 | * more new connections). |
| 1071 | */ |
| 1072 | /* Restore tty modes. */ |
| 1073 | leave_raw_mode( |
| 1074 | options.request_tty == REQUEST_TTY_FORCE); |
| 1075 | |
| 1076 | /* Stop listening for new connections. */ |
| 1077 | channel_stop_listening(); |
| 1078 | |
| 1079 | snprintf(string, sizeof string, |
| 1080 | "%c& [backgrounded]\n", escape_char); |
| 1081 | buffer_append(berr, string, strlen(string)); |
| 1082 | |
| 1083 | /* Fork into background. */ |
| 1084 | pid = fork(); |
| 1085 | if (pid < 0) { |
| 1086 | error("fork: %.100s", strerror(errno)); |
| 1087 | continue; |
| 1088 | } |
| 1089 | if (pid != 0) { /* This is the parent. */ |
| 1090 | /* The parent just exits. */ |
| 1091 | exit(0); |
| 1092 | } |
| 1093 | /* The child continues serving connections. */ |
| 1094 | if (compat20) { |
| 1095 | buffer_append(bin, "\004", 1); |
| 1096 | /* fake EOF on stdin */ |
| 1097 | return -1; |
| 1098 | } else if (!stdin_eof) { |
| 1099 | /* |
| 1100 | * Sending SSH_CMSG_EOF alone does not |
| 1101 | * always appear to be enough. So we |
| 1102 | * try to send an EOF character first. |
| 1103 | */ |
| 1104 | packet_start(SSH_CMSG_STDIN_DATA); |
| 1105 | packet_put_string("\004", 1); |
| 1106 | packet_send(); |
| 1107 | /* Close stdin. */ |
| 1108 | stdin_eof = 1; |
| 1109 | if (buffer_len(bin) == 0) { |
| 1110 | packet_start(SSH_CMSG_EOF); |
| 1111 | packet_send(); |
| 1112 | } |
| 1113 | } |
| 1114 | continue; |
| 1115 | |
| 1116 | case '?': |
| 1117 | if (c && c->ctl_chan != -1) { |
| 1118 | snprintf(string, sizeof string, |
| 1119 | "%c?\r\n\ |
| 1120 | Supported escape sequences:\r\n\ |
| 1121 | %c. - terminate session\r\n\ |
| 1122 | %cB - send a BREAK to the remote system\r\n\ |
| 1123 | %cR - Request rekey (SSH protocol 2 only)\r\n\ |
| 1124 | %c# - list forwarded connections\r\n\ |
| 1125 | %c? - this message\r\n\ |
| 1126 | %c%c - send the escape character by typing it twice\r\n\ |
| 1127 | (Note that escapes are only recognized immediately after newline.)\r\n", |
| 1128 | escape_char, escape_char, |
| 1129 | escape_char, escape_char, |
| 1130 | escape_char, escape_char, |
| 1131 | escape_char, escape_char); |
| 1132 | } else { |
| 1133 | snprintf(string, sizeof string, |
| 1134 | "%c?\r\n\ |
| 1135 | Supported escape sequences:\r\n\ |
| 1136 | %c. - terminate connection (and any multiplexed sessions)\r\n\ |
| 1137 | %cB - send a BREAK to the remote system\r\n\ |
| 1138 | %cC - open a command line\r\n\ |
| 1139 | %cR - Request rekey (SSH protocol 2 only)\r\n\ |
| 1140 | %c^Z - suspend ssh\r\n\ |
| 1141 | %c# - list forwarded connections\r\n\ |
| 1142 | %c& - background ssh (when waiting for connections to terminate)\r\n\ |
| 1143 | %c? - this message\r\n\ |
| 1144 | %c%c - send the escape character by typing it twice\r\n\ |
| 1145 | (Note that escapes are only recognized immediately after newline.)\r\n", |
| 1146 | escape_char, escape_char, |
| 1147 | escape_char, escape_char, |
| 1148 | escape_char, escape_char, |
| 1149 | escape_char, escape_char, |
| 1150 | escape_char, escape_char, |
| 1151 | escape_char); |
| 1152 | } |
| 1153 | buffer_append(berr, string, strlen(string)); |
| 1154 | continue; |
| 1155 | |
| 1156 | case '#': |
| 1157 | snprintf(string, sizeof string, "%c#\r\n", |
| 1158 | escape_char); |
| 1159 | buffer_append(berr, string, strlen(string)); |
| 1160 | s = channel_open_message(); |
| 1161 | buffer_append(berr, s, strlen(s)); |
| 1162 | xfree(s); |
| 1163 | continue; |
| 1164 | |
| 1165 | case 'C': |
| 1166 | if (c && c->ctl_chan != -1) |
| 1167 | goto noescape; |
| 1168 | process_cmdline(); |
| 1169 | continue; |
| 1170 | |
| 1171 | default: |
| 1172 | if (ch != escape_char) { |
| 1173 | buffer_put_char(bin, escape_char); |
| 1174 | bytes++; |
| 1175 | } |
| 1176 | /* Escaped characters fall through here */ |
| 1177 | break; |
| 1178 | } |
| 1179 | } else { |
| 1180 | /* |
| 1181 | * The previous character was not an escape char. |
| 1182 | * Check if this is an escape. |
| 1183 | */ |
| 1184 | if (last_was_cr && ch == escape_char) { |
| 1185 | /* |
| 1186 | * It is. Set the flag and continue to |
| 1187 | * next character. |
| 1188 | */ |
| 1189 | *escape_pendingp = 1; |
| 1190 | continue; |
| 1191 | } |
| 1192 | } |
| 1193 | |
| 1194 | /* |
| 1195 | * Normal character. Record whether it was a newline, |
| 1196 | * and append it to the buffer. |
| 1197 | */ |
| 1198 | last_was_cr = (ch == '\r' || ch == '\n'); |
| 1199 | buffer_put_char(bin, ch); |
| 1200 | bytes++; |
| 1201 | } |
| 1202 | return bytes; |
| 1203 | } |
| 1204 | |
| 1205 | static void |
| 1206 | client_process_input(fd_set *readset) |
| 1207 | { |
| 1208 | int len; |
| 1209 | char buf[SSH_IOBUFSZ]; |
| 1210 | |
| 1211 | /* Read input from stdin. */ |
| 1212 | if (FD_ISSET(fileno(stdin), readset)) { |
| 1213 | /* Read as much as possible. */ |
| 1214 | len = read(fileno(stdin), buf, sizeof(buf)); |
| 1215 | if (len < 0 && |
| 1216 | (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) |
| 1217 | return; /* we'll try again later */ |
| 1218 | if (len <= 0) { |
| 1219 | /* |
| 1220 | * Received EOF or error. They are treated |
| 1221 | * similarly, except that an error message is printed |
| 1222 | * if it was an error condition. |
| 1223 | */ |
| 1224 | if (len < 0) { |
| 1225 | snprintf(buf, sizeof buf, "read: %.100s\r\n", |
| 1226 | strerror(errno)); |
| 1227 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 1228 | } |
| 1229 | /* Mark that we have seen EOF. */ |
| 1230 | stdin_eof = 1; |
| 1231 | /* |
| 1232 | * Send an EOF message to the server unless there is |
| 1233 | * data in the buffer. If there is data in the |
| 1234 | * buffer, no message will be sent now. Code |
| 1235 | * elsewhere will send the EOF when the buffer |
| 1236 | * becomes empty if stdin_eof is set. |
| 1237 | */ |
| 1238 | if (buffer_len(&stdin_buffer) == 0) { |
| 1239 | packet_start(SSH_CMSG_EOF); |
| 1240 | packet_send(); |
| 1241 | } |
| 1242 | } else if (escape_char1 == SSH_ESCAPECHAR_NONE) { |
| 1243 | /* |
| 1244 | * Normal successful read, and no escape character. |
| 1245 | * Just append the data to buffer. |
| 1246 | */ |
| 1247 | buffer_append(&stdin_buffer, buf, len); |
| 1248 | } else { |
| 1249 | /* |
| 1250 | * Normal, successful read. But we have an escape |
| 1251 | * character and have to process the characters one |
| 1252 | * by one. |
| 1253 | */ |
| 1254 | if (process_escapes(NULL, &stdin_buffer, |
| 1255 | &stdout_buffer, &stderr_buffer, buf, len) == -1) |
| 1256 | return; |
| 1257 | } |
| 1258 | } |
| 1259 | } |
| 1260 | |
| 1261 | static void |
| 1262 | client_process_output(fd_set *writeset) |
| 1263 | { |
| 1264 | int len; |
| 1265 | char buf[100]; |
| 1266 | |
| 1267 | /* Write buffered output to stdout. */ |
| 1268 | if (FD_ISSET(fileno(stdout), writeset)) { |
| 1269 | /* Write as much data as possible. */ |
| 1270 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), |
| 1271 | buffer_len(&stdout_buffer)); |
| 1272 | if (len <= 0) { |
| 1273 | if (errno == EINTR || errno == EAGAIN || |
| 1274 | errno == EWOULDBLOCK) |
| 1275 | len = 0; |
| 1276 | else { |
| 1277 | /* |
| 1278 | * An error or EOF was encountered. Put an |
| 1279 | * error message to stderr buffer. |
| 1280 | */ |
| 1281 | snprintf(buf, sizeof buf, |
| 1282 | "write stdout: %.50s\r\n", strerror(errno)); |
| 1283 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 1284 | quit_pending = 1; |
| 1285 | return; |
| 1286 | } |
| 1287 | } |
| 1288 | /* Consume printed data from the buffer. */ |
| 1289 | buffer_consume(&stdout_buffer, len); |
| 1290 | } |
| 1291 | /* Write buffered output to stderr. */ |
| 1292 | if (FD_ISSET(fileno(stderr), writeset)) { |
| 1293 | /* Write as much data as possible. */ |
| 1294 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), |
| 1295 | buffer_len(&stderr_buffer)); |
| 1296 | if (len <= 0) { |
| 1297 | if (errno == EINTR || errno == EAGAIN || |
| 1298 | errno == EWOULDBLOCK) |
| 1299 | len = 0; |
| 1300 | else { |
| 1301 | /* |
| 1302 | * EOF or error, but can't even print |
| 1303 | * error message. |
| 1304 | */ |
| 1305 | quit_pending = 1; |
| 1306 | return; |
| 1307 | } |
| 1308 | } |
| 1309 | /* Consume printed characters from the buffer. */ |
| 1310 | buffer_consume(&stderr_buffer, len); |
| 1311 | } |
| 1312 | } |
| 1313 | |
| 1314 | /* |
| 1315 | * Get packets from the connection input buffer, and process them as long as |
| 1316 | * there are packets available. |
| 1317 | * |
| 1318 | * Any unknown packets received during the actual |
| 1319 | * session cause the session to terminate. This is |
| 1320 | * intended to make debugging easier since no |
| 1321 | * confirmations are sent. Any compatible protocol |
| 1322 | * extensions must be negotiated during the |
| 1323 | * preparatory phase. |
| 1324 | */ |
| 1325 | |
| 1326 | static void |
| 1327 | client_process_buffered_input_packets(void) |
| 1328 | { |
| 1329 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, |
| 1330 | compat20 ? xxx_kex : NULL); |
| 1331 | } |
| 1332 | |
| 1333 | /* scan buf[] for '~' before sending data to the peer */ |
| 1334 | |
| 1335 | /* Helper: allocate a new escape_filter_ctx and fill in its escape char */ |
| 1336 | void * |
| 1337 | client_new_escape_filter_ctx(int escape_char) |
| 1338 | { |
| 1339 | struct escape_filter_ctx *ret; |
| 1340 | |
| 1341 | ret = xmalloc(sizeof(*ret)); |
| 1342 | ret->escape_pending = 0; |
| 1343 | ret->escape_char = escape_char; |
| 1344 | return (void *)ret; |
| 1345 | } |
| 1346 | |
| 1347 | /* Free the escape filter context on channel free */ |
| 1348 | void |
| 1349 | client_filter_cleanup(int cid, void *ctx) |
| 1350 | { |
| 1351 | xfree(ctx); |
| 1352 | } |
| 1353 | |
| 1354 | int |
| 1355 | client_simple_escape_filter(Channel *c, char *buf, int len) |
| 1356 | { |
| 1357 | if (c->extended_usage != CHAN_EXTENDED_WRITE) |
| 1358 | return 0; |
| 1359 | |
| 1360 | return process_escapes(c, &c->input, &c->output, &c->extended, |
| 1361 | buf, len); |
| 1362 | } |
| 1363 | |
| 1364 | static void |
| 1365 | client_channel_closed(int id, void *arg) |
| 1366 | { |
| 1367 | channel_cancel_cleanup(id); |
| 1368 | session_closed = 1; |
| 1369 | leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| 1370 | } |
| 1371 | |
| 1372 | /* |
| 1373 | * Implements the interactive session with the server. This is called after |
| 1374 | * the user has been authenticated, and a command has been started on the |
| 1375 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character |
| 1376 | * used as an escape character for terminating or suspending the session. |
| 1377 | */ |
| 1378 | |
| 1379 | int |
| 1380 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
| 1381 | { |
| 1382 | fd_set *readset = NULL, *writeset = NULL; |
| 1383 | double start_time, total_time; |
| 1384 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0; |
| 1385 | u_int64_t ibytes, obytes; |
| 1386 | u_int nalloc = 0; |
| 1387 | char buf[100]; |
| 1388 | |
| 1389 | debug("Entering interactive session."); |
| 1390 | |
| 1391 | start_time = get_current_time(); |
| 1392 | |
| 1393 | /* Initialize variables. */ |
| 1394 | escape_pending1 = 0; |
| 1395 | last_was_cr = 1; |
| 1396 | exit_status = -1; |
| 1397 | stdin_eof = 0; |
| 1398 | buffer_high = 64 * 1024; |
| 1399 | connection_in = packet_get_connection_in(); |
| 1400 | connection_out = packet_get_connection_out(); |
| 1401 | max_fd = MAX(connection_in, connection_out); |
| 1402 | |
| 1403 | if (!compat20) { |
| 1404 | /* enable nonblocking unless tty */ |
| 1405 | if (!isatty(fileno(stdin))) |
| 1406 | set_nonblock(fileno(stdin)); |
| 1407 | if (!isatty(fileno(stdout))) |
| 1408 | set_nonblock(fileno(stdout)); |
| 1409 | if (!isatty(fileno(stderr))) |
| 1410 | set_nonblock(fileno(stderr)); |
| 1411 | max_fd = MAX(max_fd, fileno(stdin)); |
| 1412 | max_fd = MAX(max_fd, fileno(stdout)); |
| 1413 | max_fd = MAX(max_fd, fileno(stderr)); |
| 1414 | } |
| 1415 | quit_pending = 0; |
| 1416 | escape_char1 = escape_char_arg; |
| 1417 | |
| 1418 | /* Initialize buffers. */ |
| 1419 | buffer_init(&stdin_buffer); |
| 1420 | buffer_init(&stdout_buffer); |
| 1421 | buffer_init(&stderr_buffer); |
| 1422 | |
| 1423 | client_init_dispatch(); |
| 1424 | |
| 1425 | /* |
| 1426 | * Set signal handlers, (e.g. to restore non-blocking mode) |
| 1427 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) |
| 1428 | */ |
| 1429 | if (signal(SIGHUP, SIG_IGN) != SIG_IGN) |
| 1430 | signal(SIGHUP, signal_handler); |
| 1431 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
| 1432 | signal(SIGINT, signal_handler); |
| 1433 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) |
| 1434 | signal(SIGQUIT, signal_handler); |
| 1435 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) |
| 1436 | signal(SIGTERM, signal_handler); |
| 1437 | signal(SIGWINCH, window_change_handler); |
| 1438 | |
| 1439 | if (have_pty) |
| 1440 | enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| 1441 | |
| 1442 | if (compat20) { |
| 1443 | session_ident = ssh2_chan_id; |
| 1444 | if (session_ident != -1) { |
| 1445 | if (escape_char_arg != SSH_ESCAPECHAR_NONE) { |
| 1446 | channel_register_filter(session_ident, |
| 1447 | client_simple_escape_filter, NULL, |
| 1448 | client_filter_cleanup, |
| 1449 | client_new_escape_filter_ctx( |
| 1450 | escape_char_arg)); |
| 1451 | } |
| 1452 | channel_register_cleanup(session_ident, |
| 1453 | client_channel_closed, 0); |
| 1454 | } |
| 1455 | } else { |
| 1456 | /* Check if we should immediately send eof on stdin. */ |
| 1457 | client_check_initial_eof_on_stdin(); |
| 1458 | } |
| 1459 | |
| 1460 | /* Main loop of the client for the interactive session mode. */ |
| 1461 | while (!quit_pending) { |
| 1462 | |
| 1463 | /* Process buffered packets sent by the server. */ |
| 1464 | client_process_buffered_input_packets(); |
| 1465 | |
| 1466 | if (compat20 && session_closed && !channel_still_open()) |
| 1467 | break; |
| 1468 | |
| 1469 | rekeying = (xxx_kex != NULL && !xxx_kex->done); |
| 1470 | |
| 1471 | if (rekeying) { |
| 1472 | debug("rekeying in progress"); |
| 1473 | } else { |
| 1474 | /* |
| 1475 | * Make packets of buffered stdin data, and buffer |
| 1476 | * them for sending to the server. |
| 1477 | */ |
| 1478 | if (!compat20) |
| 1479 | client_make_packets_from_stdin_data(); |
| 1480 | |
| 1481 | /* |
| 1482 | * Make packets from buffered channel data, and |
| 1483 | * enqueue them for sending to the server. |
| 1484 | */ |
| 1485 | if (packet_not_very_much_data_to_write()) |
| 1486 | channel_output_poll(); |
| 1487 | |
| 1488 | /* |
| 1489 | * Check if the window size has changed, and buffer a |
| 1490 | * message about it to the server if so. |
| 1491 | */ |
| 1492 | client_check_window_change(); |
| 1493 | |
| 1494 | if (quit_pending) |
| 1495 | break; |
| 1496 | } |
| 1497 | /* |
| 1498 | * Wait until we have something to do (something becomes |
| 1499 | * available on one of the descriptors). |
| 1500 | */ |
| 1501 | max_fd2 = max_fd; |
| 1502 | client_wait_until_can_do_something(&readset, &writeset, |
| 1503 | &max_fd2, &nalloc, rekeying); |
| 1504 | |
| 1505 | if (quit_pending) |
| 1506 | break; |
| 1507 | |
| 1508 | /* Do channel operations unless rekeying in progress. */ |
| 1509 | if (!rekeying) { |
| 1510 | channel_after_select(readset, writeset); |
| 1511 | if (need_rekeying || packet_need_rekeying()) { |
| 1512 | debug("need rekeying"); |
| 1513 | xxx_kex->done = 0; |
| 1514 | kex_send_kexinit(xxx_kex); |
| 1515 | need_rekeying = 0; |
| 1516 | } |
| 1517 | } |
| 1518 | |
| 1519 | /* Buffer input from the connection. */ |
| 1520 | client_process_net_input(readset); |
| 1521 | |
| 1522 | if (quit_pending) |
| 1523 | break; |
| 1524 | |
| 1525 | if (!compat20) { |
| 1526 | /* Buffer data from stdin */ |
| 1527 | client_process_input(readset); |
| 1528 | /* |
| 1529 | * Process output to stdout and stderr. Output to |
| 1530 | * the connection is processed elsewhere (above). |
| 1531 | */ |
| 1532 | client_process_output(writeset); |
| 1533 | } |
| 1534 | |
| 1535 | if (session_resumed) { |
| 1536 | connection_in = packet_get_connection_in(); |
| 1537 | connection_out = packet_get_connection_out(); |
| 1538 | max_fd = MAX(max_fd, connection_out); |
| 1539 | max_fd = MAX(max_fd, connection_in); |
| 1540 | session_resumed = 0; |
| 1541 | } |
| 1542 | |
| 1543 | /* |
| 1544 | * Send as much buffered packet data as possible to the |
| 1545 | * sender. |
| 1546 | */ |
| 1547 | if (FD_ISSET(connection_out, writeset)) |
| 1548 | packet_write_poll(); |
| 1549 | |
| 1550 | /* |
| 1551 | * If we are a backgrounded control master, and the |
| 1552 | * timeout has expired without any active client |
| 1553 | * connections, then quit. |
| 1554 | */ |
| 1555 | if (control_persist_exit_time > 0) { |
| 1556 | if (time(NULL) >= control_persist_exit_time) { |
| 1557 | debug("ControlPersist timeout expired"); |
| 1558 | break; |
| 1559 | } |
| 1560 | } |
| 1561 | } |
| 1562 | if (readset) |
| 1563 | xfree(readset); |
| 1564 | if (writeset) |
| 1565 | xfree(writeset); |
| 1566 | |
| 1567 | /* Terminate the session. */ |
| 1568 | |
| 1569 | /* Stop watching for window change. */ |
| 1570 | signal(SIGWINCH, SIG_DFL); |
| 1571 | |
| 1572 | if (compat20) { |
| 1573 | packet_start(SSH2_MSG_DISCONNECT); |
| 1574 | packet_put_int(SSH2_DISCONNECT_BY_APPLICATION); |
| 1575 | packet_put_cstring("disconnected by user"); |
| 1576 | packet_put_cstring(""); /* language tag */ |
| 1577 | packet_send(); |
| 1578 | packet_write_wait(); |
| 1579 | } |
| 1580 | |
| 1581 | channel_free_all(); |
| 1582 | |
| 1583 | if (have_pty) |
| 1584 | leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| 1585 | |
| 1586 | /* restore blocking io */ |
| 1587 | if (!isatty(fileno(stdin))) |
| 1588 | unset_nonblock(fileno(stdin)); |
| 1589 | if (!isatty(fileno(stdout))) |
| 1590 | unset_nonblock(fileno(stdout)); |
| 1591 | if (!isatty(fileno(stderr))) |
| 1592 | unset_nonblock(fileno(stderr)); |
| 1593 | |
| 1594 | /* |
| 1595 | * If there was no shell or command requested, there will be no remote |
| 1596 | * exit status to be returned. In that case, clear error code if the |
| 1597 | * connection was deliberately terminated at this end. |
| 1598 | */ |
| 1599 | if (no_shell_flag && received_signal == SIGTERM) { |
| 1600 | received_signal = 0; |
| 1601 | exit_status = 0; |
| 1602 | } |
| 1603 | |
| 1604 | if (received_signal) |
| 1605 | fatal("Killed by signal %d.", (int) received_signal); |
| 1606 | |
| 1607 | /* |
| 1608 | * In interactive mode (with pseudo tty) display a message indicating |
| 1609 | * that the connection has been closed. |
| 1610 | */ |
| 1611 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { |
| 1612 | snprintf(buf, sizeof buf, |
| 1613 | "Connection to %.64s closed.\r\n", host); |
| 1614 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 1615 | } |
| 1616 | |
| 1617 | /* Output any buffered data for stdout. */ |
| 1618 | if (buffer_len(&stdout_buffer) > 0) { |
| 1619 | len = atomicio(vwrite, fileno(stdout), |
| 1620 | buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer)); |
| 1621 | if (len < 0 || (u_int)len != buffer_len(&stdout_buffer)) |
| 1622 | error("Write failed flushing stdout buffer."); |
| 1623 | else |
| 1624 | buffer_consume(&stdout_buffer, len); |
| 1625 | } |
| 1626 | |
| 1627 | /* Output any buffered data for stderr. */ |
| 1628 | if (buffer_len(&stderr_buffer) > 0) { |
| 1629 | len = atomicio(vwrite, fileno(stderr), |
| 1630 | buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer)); |
| 1631 | if (len < 0 || (u_int)len != buffer_len(&stderr_buffer)) |
| 1632 | error("Write failed flushing stderr buffer."); |
| 1633 | else |
| 1634 | buffer_consume(&stderr_buffer, len); |
| 1635 | } |
| 1636 | |
| 1637 | /* Clear and free any buffers. */ |
| 1638 | memset(buf, 0, sizeof(buf)); |
| 1639 | buffer_free(&stdin_buffer); |
| 1640 | buffer_free(&stdout_buffer); |
| 1641 | buffer_free(&stderr_buffer); |
| 1642 | |
| 1643 | /* Report bytes transferred, and transfer rates. */ |
| 1644 | total_time = get_current_time() - start_time; |
| 1645 | packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes); |
| 1646 | packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes); |
| 1647 | verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds", |
| 1648 | (unsigned long long)obytes, (unsigned long long)ibytes, total_time); |
| 1649 | if (total_time > 0) |
| 1650 | verbose("Bytes per second: sent %.1f, received %.1f", |
| 1651 | obytes / total_time, ibytes / total_time); |
| 1652 | /* Return the exit status of the program. */ |
| 1653 | debug("Exit status %d", exit_status); |
| 1654 | return exit_status; |
| 1655 | } |
| 1656 | |
| 1657 | /*********/ |
| 1658 | |
| 1659 | static void |
| 1660 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
| 1661 | { |
| 1662 | u_int data_len; |
| 1663 | char *data = packet_get_string(&data_len); |
| 1664 | packet_check_eom(); |
| 1665 | buffer_append(&stdout_buffer, data, data_len); |
| 1666 | memset(data, 0, data_len); |
| 1667 | xfree(data); |
| 1668 | } |
| 1669 | static void |
| 1670 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
| 1671 | { |
| 1672 | u_int data_len; |
| 1673 | char *data = packet_get_string(&data_len); |
| 1674 | packet_check_eom(); |
| 1675 | buffer_append(&stderr_buffer, data, data_len); |
| 1676 | memset(data, 0, data_len); |
| 1677 | xfree(data); |
| 1678 | } |
| 1679 | static void |
| 1680 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
| 1681 | { |
| 1682 | exit_status = packet_get_int(); |
| 1683 | packet_check_eom(); |
| 1684 | /* Acknowledge the exit. */ |
| 1685 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); |
| 1686 | packet_send(); |
| 1687 | /* |
| 1688 | * Must wait for packet to be sent since we are |
| 1689 | * exiting the loop. |
| 1690 | */ |
| 1691 | packet_write_wait(); |
| 1692 | /* Flag that we want to exit. */ |
| 1693 | quit_pending = 1; |
| 1694 | } |
| 1695 | static void |
| 1696 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) |
| 1697 | { |
| 1698 | Channel *c = NULL; |
| 1699 | int remote_id, sock; |
| 1700 | |
| 1701 | /* Read the remote channel number from the message. */ |
| 1702 | remote_id = packet_get_int(); |
| 1703 | packet_check_eom(); |
| 1704 | |
| 1705 | /* |
| 1706 | * Get a connection to the local authentication agent (this may again |
| 1707 | * get forwarded). |
| 1708 | */ |
| 1709 | sock = ssh_get_authentication_socket(); |
| 1710 | |
| 1711 | /* |
| 1712 | * If we could not connect the agent, send an error message back to |
| 1713 | * the server. This should never happen unless the agent dies, |
| 1714 | * because authentication forwarding is only enabled if we have an |
| 1715 | * agent. |
| 1716 | */ |
| 1717 | if (sock >= 0) { |
| 1718 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, |
| 1719 | -1, 0, 0, 0, "authentication agent connection", 1); |
| 1720 | c->remote_id = remote_id; |
| 1721 | c->force_drain = 1; |
| 1722 | } |
| 1723 | if (c == NULL) { |
| 1724 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1725 | packet_put_int(remote_id); |
| 1726 | } else { |
| 1727 | /* Send a confirmation to the remote host. */ |
| 1728 | debug("Forwarding authentication connection."); |
| 1729 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1730 | packet_put_int(remote_id); |
| 1731 | packet_put_int(c->self); |
| 1732 | } |
| 1733 | packet_send(); |
| 1734 | } |
| 1735 | |
| 1736 | static Channel * |
| 1737 | client_request_forwarded_tcpip(const char *request_type, int rchan) |
| 1738 | { |
| 1739 | Channel *c = NULL; |
| 1740 | char *listen_address, *originator_address; |
| 1741 | u_short listen_port, originator_port; |
| 1742 | |
| 1743 | /* Get rest of the packet */ |
| 1744 | listen_address = packet_get_string(NULL); |
| 1745 | listen_port = packet_get_int(); |
| 1746 | originator_address = packet_get_string(NULL); |
| 1747 | originator_port = packet_get_int(); |
| 1748 | packet_check_eom(); |
| 1749 | |
| 1750 | debug("client_request_forwarded_tcpip: listen %s port %d, " |
| 1751 | "originator %s port %d", listen_address, listen_port, |
| 1752 | originator_address, originator_port); |
| 1753 | |
| 1754 | c = channel_connect_by_listen_address(listen_port, |
| 1755 | "forwarded-tcpip", originator_address); |
| 1756 | |
| 1757 | xfree(originator_address); |
| 1758 | xfree(listen_address); |
| 1759 | return c; |
| 1760 | } |
| 1761 | |
| 1762 | static Channel * |
| 1763 | client_request_x11(const char *request_type, int rchan) |
| 1764 | { |
| 1765 | Channel *c = NULL; |
| 1766 | char *originator; |
| 1767 | u_short originator_port; |
| 1768 | int sock; |
| 1769 | |
| 1770 | if (!options.forward_x11) { |
| 1771 | error("Warning: ssh server tried X11 forwarding."); |
| 1772 | error("Warning: this is probably a break-in attempt by a " |
| 1773 | "malicious server."); |
| 1774 | return NULL; |
| 1775 | } |
| 1776 | if (x11_refuse_time != 0 && time(NULL) >= x11_refuse_time) { |
| 1777 | verbose("Rejected X11 connection after ForwardX11Timeout " |
| 1778 | "expired"); |
| 1779 | return NULL; |
| 1780 | } |
| 1781 | originator = packet_get_string(NULL); |
| 1782 | if (datafellows & SSH_BUG_X11FWD) { |
| 1783 | debug2("buggy server: x11 request w/o originator_port"); |
| 1784 | originator_port = 0; |
| 1785 | } else { |
| 1786 | originator_port = packet_get_int(); |
| 1787 | } |
| 1788 | packet_check_eom(); |
| 1789 | /* XXX check permission */ |
| 1790 | debug("client_request_x11: request from %s %d", originator, |
| 1791 | originator_port); |
| 1792 | xfree(originator); |
| 1793 | sock = x11_connect_display(); |
| 1794 | if (sock < 0) |
| 1795 | return NULL; |
| 1796 | c = channel_new("x11", |
| 1797 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, |
| 1798 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
| 1799 | c->force_drain = 1; |
| 1800 | return c; |
| 1801 | } |
| 1802 | |
| 1803 | static Channel * |
| 1804 | client_request_agent(const char *request_type, int rchan) |
| 1805 | { |
| 1806 | Channel *c = NULL; |
| 1807 | int sock; |
| 1808 | |
| 1809 | if (!options.forward_agent) { |
| 1810 | error("Warning: ssh server tried agent forwarding."); |
| 1811 | error("Warning: this is probably a break-in attempt by a " |
| 1812 | "malicious server."); |
| 1813 | return NULL; |
| 1814 | } |
| 1815 | sock = ssh_get_authentication_socket(); |
| 1816 | if (sock < 0) |
| 1817 | return NULL; |
| 1818 | c = channel_new("authentication agent connection", |
| 1819 | SSH_CHANNEL_OPEN, sock, sock, -1, |
| 1820 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, |
| 1821 | "authentication agent connection", 1); |
| 1822 | c->force_drain = 1; |
| 1823 | return c; |
| 1824 | } |
| 1825 | |
| 1826 | int |
| 1827 | client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun) |
| 1828 | { |
| 1829 | Channel *c; |
| 1830 | int fd; |
| 1831 | |
| 1832 | if (tun_mode == SSH_TUNMODE_NO) |
| 1833 | return 0; |
| 1834 | |
| 1835 | if (!compat20) { |
| 1836 | error("Tunnel forwarding is not supported for protocol 1"); |
| 1837 | return -1; |
| 1838 | } |
| 1839 | |
| 1840 | debug("Requesting tun unit %d in mode %d", local_tun, tun_mode); |
| 1841 | |
| 1842 | /* Open local tunnel device */ |
| 1843 | if ((fd = tun_open(local_tun, tun_mode)) == -1) { |
| 1844 | error("Tunnel device open failed."); |
| 1845 | return -1; |
| 1846 | } |
| 1847 | |
| 1848 | c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, |
| 1849 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); |
| 1850 | c->datagram = 1; |
| 1851 | |
| 1852 | #if defined(SSH_TUN_FILTER) |
| 1853 | if (options.tun_open == SSH_TUNMODE_POINTOPOINT) |
| 1854 | channel_register_filter(c->self, sys_tun_infilter, |
| 1855 | sys_tun_outfilter, NULL, NULL); |
| 1856 | #endif |
| 1857 | |
| 1858 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1859 | packet_put_cstring("tun@openssh.com"); |
| 1860 | packet_put_int(c->self); |
| 1861 | packet_put_int(c->local_window_max); |
| 1862 | packet_put_int(c->local_maxpacket); |
| 1863 | packet_put_int(tun_mode); |
| 1864 | packet_put_int(remote_tun); |
| 1865 | packet_send(); |
| 1866 | |
| 1867 | return 0; |
| 1868 | } |
| 1869 | |
| 1870 | /* XXXX move to generic input handler */ |
| 1871 | static void |
| 1872 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
| 1873 | { |
| 1874 | Channel *c = NULL; |
| 1875 | char *ctype; |
| 1876 | int rchan; |
| 1877 | u_int rmaxpack, rwindow, len; |
| 1878 | |
| 1879 | ctype = packet_get_string(&len); |
| 1880 | rchan = packet_get_int(); |
| 1881 | rwindow = packet_get_int(); |
| 1882 | rmaxpack = packet_get_int(); |
| 1883 | |
| 1884 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
| 1885 | ctype, rchan, rwindow, rmaxpack); |
| 1886 | |
| 1887 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
| 1888 | c = client_request_forwarded_tcpip(ctype, rchan); |
| 1889 | } else if (strcmp(ctype, "x11") == 0) { |
| 1890 | c = client_request_x11(ctype, rchan); |
| 1891 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { |
| 1892 | c = client_request_agent(ctype, rchan); |
| 1893 | } |
| 1894 | /* XXX duplicate : */ |
| 1895 | if (c != NULL) { |
| 1896 | debug("confirm %s", ctype); |
| 1897 | c->remote_id = rchan; |
| 1898 | c->remote_window = rwindow; |
| 1899 | c->remote_maxpacket = rmaxpack; |
| 1900 | if (c->type != SSH_CHANNEL_CONNECTING) { |
| 1901 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1902 | packet_put_int(c->remote_id); |
| 1903 | packet_put_int(c->self); |
| 1904 | packet_put_int(c->local_window); |
| 1905 | packet_put_int(c->local_maxpacket); |
| 1906 | packet_send(); |
| 1907 | } |
| 1908 | } else { |
| 1909 | debug("failure %s", ctype); |
| 1910 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| 1911 | packet_put_int(rchan); |
| 1912 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); |
| 1913 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
| 1914 | packet_put_cstring("open failed"); |
| 1915 | packet_put_cstring(""); |
| 1916 | } |
| 1917 | packet_send(); |
| 1918 | } |
| 1919 | xfree(ctype); |
| 1920 | } |
| 1921 | static void |
| 1922 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
| 1923 | { |
| 1924 | Channel *c = NULL; |
| 1925 | int exitval, id, reply, success = 0; |
| 1926 | char *rtype; |
| 1927 | |
| 1928 | id = packet_get_int(); |
| 1929 | rtype = packet_get_string(NULL); |
| 1930 | reply = packet_get_char(); |
| 1931 | |
| 1932 | debug("client_input_channel_req: channel %d rtype %s reply %d", |
| 1933 | id, rtype, reply); |
| 1934 | |
| 1935 | if (id == -1) { |
| 1936 | error("client_input_channel_req: request for channel -1"); |
| 1937 | } else if ((c = channel_lookup(id)) == NULL) { |
| 1938 | error("client_input_channel_req: channel %d: " |
| 1939 | "unknown channel", id); |
| 1940 | } else if (strcmp(rtype, "eow@openssh.com") == 0) { |
| 1941 | packet_check_eom(); |
| 1942 | chan_rcvd_eow(c); |
| 1943 | } else if (strcmp(rtype, "exit-status") == 0) { |
| 1944 | exitval = packet_get_int(); |
| 1945 | if (c->ctl_chan != -1) { |
| 1946 | mux_exit_message(c, exitval); |
| 1947 | success = 1; |
| 1948 | } else if (id == session_ident) { |
| 1949 | /* Record exit value of local session */ |
| 1950 | success = 1; |
| 1951 | exit_status = exitval; |
| 1952 | } else { |
| 1953 | /* Probably for a mux channel that has already closed */ |
| 1954 | debug("%s: no sink for exit-status on channel %d", |
| 1955 | __func__, id); |
| 1956 | } |
| 1957 | packet_check_eom(); |
| 1958 | } |
| 1959 | if (reply && c != NULL) { |
| 1960 | packet_start(success ? |
| 1961 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); |
| 1962 | packet_put_int(c->remote_id); |
| 1963 | packet_send(); |
| 1964 | } |
| 1965 | xfree(rtype); |
| 1966 | } |
| 1967 | static void |
| 1968 | client_input_global_request(int type, u_int32_t seq, void *ctxt) |
| 1969 | { |
| 1970 | char *rtype; |
| 1971 | int want_reply; |
| 1972 | int success = 0; |
| 1973 | |
| 1974 | rtype = packet_get_string(NULL); |
| 1975 | want_reply = packet_get_char(); |
| 1976 | debug("client_input_global_request: rtype %s want_reply %d", |
| 1977 | rtype, want_reply); |
| 1978 | if (want_reply) { |
| 1979 | packet_start(success ? |
| 1980 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); |
| 1981 | packet_send(); |
| 1982 | packet_write_wait(); |
| 1983 | } |
| 1984 | xfree(rtype); |
| 1985 | } |
| 1986 | |
| 1987 | void |
| 1988 | client_session2_setup(int id, int want_tty, int want_subsystem, |
| 1989 | const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env) |
| 1990 | { |
| 1991 | int len; |
| 1992 | Channel *c = NULL; |
| 1993 | |
| 1994 | debug2("%s: id %d", __func__, id); |
| 1995 | |
| 1996 | if ((c = channel_lookup(id)) == NULL) |
| 1997 | fatal("client_session2_setup: channel %d: unknown channel", id); |
| 1998 | |
| 1999 | packet_set_interactive(want_tty, |
| 2000 | options.ip_qos_interactive, options.ip_qos_bulk); |
| 2001 | |
| 2002 | if (want_tty) { |
| 2003 | struct winsize ws; |
| 2004 | |
| 2005 | /* Store window size in the packet. */ |
| 2006 | if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) |
| 2007 | memset(&ws, 0, sizeof(ws)); |
| 2008 | |
| 2009 | channel_request_start(id, "pty-req", 1); |
| 2010 | client_expect_confirm(id, "PTY allocation", CONFIRM_TTY); |
| 2011 | packet_put_cstring(term != NULL ? term : ""); |
| 2012 | packet_put_int((u_int)ws.ws_col); |
| 2013 | packet_put_int((u_int)ws.ws_row); |
| 2014 | packet_put_int((u_int)ws.ws_xpixel); |
| 2015 | packet_put_int((u_int)ws.ws_ypixel); |
| 2016 | if (tiop == NULL) |
| 2017 | tiop = get_saved_tio(); |
| 2018 | tty_make_modes(-1, tiop); |
| 2019 | packet_send(); |
| 2020 | /* XXX wait for reply */ |
| 2021 | c->client_tty = 1; |
| 2022 | } |
| 2023 | |
| 2024 | /* Transfer any environment variables from client to server */ |
| 2025 | if (options.num_send_env != 0 && env != NULL) { |
| 2026 | int i, j, matched; |
| 2027 | char *name, *val; |
| 2028 | |
| 2029 | debug("Sending environment."); |
| 2030 | for (i = 0; env[i] != NULL; i++) { |
| 2031 | /* Split */ |
| 2032 | name = xstrdup(env[i]); |
| 2033 | if ((val = strchr(name, '=')) == NULL) { |
| 2034 | xfree(name); |
| 2035 | continue; |
| 2036 | } |
| 2037 | *val++ = '\0'; |
| 2038 | |
| 2039 | matched = 0; |
| 2040 | for (j = 0; j < options.num_send_env; j++) { |
| 2041 | if (match_pattern(name, options.send_env[j])) { |
| 2042 | matched = 1; |
| 2043 | break; |
| 2044 | } |
| 2045 | } |
| 2046 | if (!matched) { |
| 2047 | debug3("Ignored env %s", name); |
| 2048 | xfree(name); |
| 2049 | continue; |
| 2050 | } |
| 2051 | |
| 2052 | debug("Sending env %s = %s", name, val); |
| 2053 | channel_request_start(id, "env", 0); |
| 2054 | packet_put_cstring(name); |
| 2055 | packet_put_cstring(val); |
| 2056 | packet_send(); |
| 2057 | xfree(name); |
| 2058 | } |
| 2059 | } |
| 2060 | |
| 2061 | len = buffer_len(cmd); |
| 2062 | if (len > 0) { |
| 2063 | if (len > 900) |
| 2064 | len = 900; |
| 2065 | if (want_subsystem) { |
| 2066 | debug("Sending subsystem: %.*s", |
| 2067 | len, (u_char*)buffer_ptr(cmd)); |
| 2068 | channel_request_start(id, "subsystem", 1); |
| 2069 | client_expect_confirm(id, "subsystem", CONFIRM_CLOSE); |
| 2070 | } else { |
| 2071 | debug("Sending command: %.*s", |
| 2072 | len, (u_char*)buffer_ptr(cmd)); |
| 2073 | channel_request_start(id, "exec", 1); |
| 2074 | client_expect_confirm(id, "exec", CONFIRM_CLOSE); |
| 2075 | } |
| 2076 | packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); |
| 2077 | packet_send(); |
| 2078 | } else { |
| 2079 | channel_request_start(id, "shell", 1); |
| 2080 | client_expect_confirm(id, "shell", CONFIRM_CLOSE); |
| 2081 | packet_send(); |
| 2082 | } |
| 2083 | } |
| 2084 | |
| 2085 | static void |
| 2086 | client_init_dispatch_20(void) |
| 2087 | { |
| 2088 | dispatch_init(&dispatch_protocol_error); |
| 2089 | |
| 2090 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
| 2091 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); |
| 2092 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); |
| 2093 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); |
| 2094 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
| 2095 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 2096 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| 2097 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
| 2098 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
| 2099 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm); |
| 2100 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm); |
| 2101 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
| 2102 | |
| 2103 | /* rekeying */ |
| 2104 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); |
| 2105 | |
| 2106 | /* global request reply messages */ |
| 2107 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); |
| 2108 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); |
| 2109 | } |
| 2110 | |
| 2111 | static void |
| 2112 | client_init_dispatch_13(void) |
| 2113 | { |
| 2114 | dispatch_init(NULL); |
| 2115 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); |
| 2116 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); |
| 2117 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); |
| 2118 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 2119 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| 2120 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); |
| 2121 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
| 2122 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); |
| 2123 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); |
| 2124 | |
| 2125 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? |
| 2126 | &client_input_agent_open : &deny_input_open); |
| 2127 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
| 2128 | &x11_input_open : &deny_input_open); |
| 2129 | } |
| 2130 | |
| 2131 | static void |
| 2132 | client_init_dispatch_15(void) |
| 2133 | { |
| 2134 | client_init_dispatch_13(); |
| 2135 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); |
| 2136 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); |
| 2137 | } |
| 2138 | |
| 2139 | static void |
| 2140 | client_init_dispatch(void) |
| 2141 | { |
| 2142 | if (compat20) |
| 2143 | client_init_dispatch_20(); |
| 2144 | else if (compat13) |
| 2145 | client_init_dispatch_13(); |
| 2146 | else |
| 2147 | client_init_dispatch_15(); |
| 2148 | } |
| 2149 | |
| 2150 | void |
| 2151 | client_stop_mux(void) |
| 2152 | { |
| 2153 | if (options.control_path != NULL && muxserver_sock != -1) |
| 2154 | unlink(options.control_path); |
| 2155 | /* |
| 2156 | * If we are in persist mode, signal that we should close when all |
| 2157 | * active channels are closed. |
| 2158 | */ |
| 2159 | if (options.control_persist) { |
| 2160 | session_closed = 1; |
| 2161 | setproctitle("[stopped mux]"); |
| 2162 | } |
| 2163 | } |
| 2164 | |
| 2165 | /* client specific fatal cleanup */ |
| 2166 | void |
| 2167 | cleanup_exit(int i) |
| 2168 | { |
| 2169 | leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| 2170 | leave_non_blocking(); |
| 2171 | if (options.control_path != NULL && muxserver_sock != -1) |
| 2172 | unlink(options.control_path); |
| 2173 | ssh_kill_proxy_command(); |
| 2174 | _exit(i); |
| 2175 | } |