1 /* $NetBSD: clientloop.c,v 1.4 2010/11/21 18:29:48 adam Exp $ */ 2 /* $OpenBSD: clientloop.c,v 1.222 2010/07/19 09:15:12 djm Exp $ */ 3 /* 4 * Author: Tatu Ylonen <ylo@cs.hut.fi> 5 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 6 * All rights reserved 7 * The main loop for the interactive session (client side). 8 * 9 * As far as I am concerned, the code I have written for this software 10 * can be used freely for any purpose. Any derived versions of this 11 * software must be clearly marked as such, and if the derived work is 12 * incompatible with the protocol description in the RFC file, it must be 13 * called by a name other than "ssh" or "Secure Shell". 14 * 15 * 16 * Copyright (c) 1999 Theo de Raadt. All rights reserved. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions 20 * are met: 21 * 1. Redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer. 23 * 2. Redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 28 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 29 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 30 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 31 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 32 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 33 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 34 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 35 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 36 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 37 * 38 * 39 * SSH2 support added by Markus Friedl. 40 * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 52 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 53 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 54 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 55 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 56 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 60 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 61 */ 62 63 #include "includes.h" 64 __RCSID("$NetBSD: clientloop.c,v 1.4 2010/11/21 18:29:48 adam Exp $"); 65 #include <sys/types.h> 66 #include <sys/ioctl.h> 67 #include <sys/stat.h> 68 #include <sys/socket.h> 69 #include <sys/time.h> 70 #include <sys/param.h> 71 #include <sys/queue.h> 72 73 #include <ctype.h> 74 #include <errno.h> 75 #include <paths.h> 76 #include <signal.h> 77 #include <stdio.h> 78 #include <stdlib.h> 79 #include <string.h> 80 #include <termios.h> 81 #include <pwd.h> 82 #include <unistd.h> 83 84 #include "xmalloc.h" 85 #include "ssh.h" 86 #include "ssh1.h" 87 #include "ssh2.h" 88 #include "packet.h" 89 #include "buffer.h" 90 #include "compat.h" 91 #include "channels.h" 92 #include "dispatch.h" 93 #include "key.h" 94 #include "cipher.h" 95 #include "kex.h" 96 #include "log.h" 97 #include "readconf.h" 98 #include "clientloop.h" 99 #include "sshconnect.h" 100 #include "authfd.h" 101 #include "atomicio.h" 102 #include "sshpty.h" 103 #include "misc.h" 104 #include "match.h" 105 #include "msg.h" 106 #include "roaming.h" 107 #include "getpeereid.h" 108 109 /* import options */ 110 extern Options options; 111 112 /* Flag indicating that stdin should be redirected from /dev/null. */ 113 extern int stdin_null_flag; 114 115 /* Flag indicating that no shell has been requested */ 116 extern int no_shell_flag; 117 118 /* Control socket */ 119 extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */ 120 121 /* 122 * Name of the host we are connecting to. This is the name given on the 123 * command line, or the HostName specified for the user-supplied name in a 124 * configuration file. 125 */ 126 extern char *host; 127 128 /* Force TTY allocation */ 129 extern int force_tty_flag; 130 131 /* 132 * Flag to indicate that we have received a window change signal which has 133 * not yet been processed. This will cause a message indicating the new 134 * window size to be sent to the server a little later. This is volatile 135 * because this is updated in a signal handler. 136 */ 137 static volatile sig_atomic_t received_window_change_signal = 0; 138 static volatile sig_atomic_t received_signal = 0; 139 140 /* Flag indicating whether the user's terminal is in non-blocking mode. */ 141 static int in_non_blocking_mode = 0; 142 143 /* Time when backgrounded control master using ControlPersist should exit */ 144 static time_t control_persist_exit_time = 0; 145 146 /* Common data for the client loop code. */ 147 volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */ 148 static int escape_char1; /* Escape character. (proto1 only) */ 149 static int escape_pending1; /* Last character was an escape (proto1 only) */ 150 static int last_was_cr; /* Last character was a newline. */ 151 static int exit_status; /* Used to store the command exit status. */ 152 static int stdin_eof; /* EOF has been encountered on stderr. */ 153 static Buffer stdin_buffer; /* Buffer for stdin data. */ 154 static Buffer stdout_buffer; /* Buffer for stdout data. */ 155 static Buffer stderr_buffer; /* Buffer for stderr data. */ 156 static u_int buffer_high; /* Soft max buffer size. */ 157 static int connection_in; /* Connection to server (input). */ 158 static int connection_out; /* Connection to server (output). */ 159 static int need_rekeying; /* Set to non-zero if rekeying is requested. */ 160 static int session_closed; /* In SSH2: login session closed. */ 161 static int x11_refuse_time; /* If >0, refuse x11 opens after this time. */ 162 163 static void client_init_dispatch(void); 164 int session_ident = -1; 165 166 int session_resumed = 0; 167 168 /* Track escape per proto2 channel */ 169 struct escape_filter_ctx { 170 int escape_pending; 171 int escape_char; 172 }; 173 174 /* Context for channel confirmation replies */ 175 struct channel_reply_ctx { 176 const char *request_type; 177 int id, do_close; 178 }; 179 180 /* Global request success/failure callbacks */ 181 struct global_confirm { 182 TAILQ_ENTRY(global_confirm) entry; 183 global_confirm_cb *cb; 184 void *ctx; 185 int ref_count; 186 }; 187 TAILQ_HEAD(global_confirms, global_confirm); 188 static struct global_confirms global_confirms = 189 TAILQ_HEAD_INITIALIZER(global_confirms); 190 191 /*XXX*/ 192 extern Kex *xxx_kex; 193 194 void ssh_process_session2_setup(int, int, int, Buffer *); 195 196 /* Restores stdin to blocking mode. */ 197 198 static void 199 leave_non_blocking(void) 200 { 201 if (in_non_blocking_mode) { 202 unset_nonblock(fileno(stdin)); 203 in_non_blocking_mode = 0; 204 } 205 } 206 207 /* Puts stdin terminal in non-blocking mode. */ 208 209 static void 210 enter_non_blocking(void) 211 { 212 in_non_blocking_mode = 1; 213 set_nonblock(fileno(stdin)); 214 } 215 216 /* 217 * Signal handler for the window change signal (SIGWINCH). This just sets a 218 * flag indicating that the window has changed. 219 */ 220 /*ARGSUSED */ 221 static void 222 window_change_handler(int sig) 223 { 224 received_window_change_signal = 1; 225 signal(SIGWINCH, window_change_handler); 226 } 227 228 /* 229 * Signal handler for signals that cause the program to terminate. These 230 * signals must be trapped to restore terminal modes. 231 */ 232 /*ARGSUSED */ 233 static void 234 signal_handler(int sig) 235 { 236 received_signal = sig; 237 quit_pending = 1; 238 } 239 240 /* 241 * Returns current time in seconds from Jan 1, 1970 with the maximum 242 * available resolution. 243 */ 244 245 static double 246 get_current_time(void) 247 { 248 struct timeval tv; 249 gettimeofday(&tv, NULL); 250 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; 251 } 252 253 /* 254 * Sets control_persist_exit_time to the absolute time when the 255 * backgrounded control master should exit due to expiry of the 256 * ControlPersist timeout. Sets it to 0 if we are not a backgrounded 257 * control master process, or if there is no ControlPersist timeout. 258 */ 259 static void 260 set_control_persist_exit_time(void) 261 { 262 if (muxserver_sock == -1 || !options.control_persist 263 || options.control_persist_timeout == 0) 264 /* not using a ControlPersist timeout */ 265 control_persist_exit_time = 0; 266 else if (channel_still_open()) { 267 /* some client connections are still open */ 268 if (control_persist_exit_time > 0) 269 debug2("%s: cancel scheduled exit", __func__); 270 control_persist_exit_time = 0; 271 } else if (control_persist_exit_time <= 0) { 272 /* a client connection has recently closed */ 273 control_persist_exit_time = time(NULL) + 274 (time_t)options.control_persist_timeout; 275 debug2("%s: schedule exit in %d seconds", __func__, 276 options.control_persist_timeout); 277 } 278 /* else we are already counting down to the timeout */ 279 } 280 281 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" 282 void 283 client_x11_get_proto(const char *display, const char *xauth_path, 284 u_int trusted, u_int timeout, char **_proto, char **_data) 285 { 286 char cmd[1024]; 287 char line[512]; 288 char xdisplay[512]; 289 static char proto[512], data[512]; 290 FILE *f; 291 int got_data = 0, generated = 0, do_unlink = 0, i; 292 char *xauthdir, *xauthfile; 293 struct stat st; 294 u_int now; 295 296 xauthdir = xauthfile = NULL; 297 *_proto = proto; 298 *_data = data; 299 proto[0] = data[0] = '\0'; 300 301 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { 302 debug("No xauth program."); 303 } else { 304 if (display == NULL) { 305 debug("x11_get_proto: DISPLAY not set"); 306 return; 307 } 308 /* 309 * Handle FamilyLocal case where $DISPLAY does 310 * not match an authorization entry. For this we 311 * just try "xauth list unix:displaynum.screennum". 312 * XXX: "localhost" match to determine FamilyLocal 313 * is not perfect. 314 */ 315 if (strncmp(display, "localhost:", 10) == 0) { 316 snprintf(xdisplay, sizeof(xdisplay), "unix:%s", 317 display + 10); 318 display = xdisplay; 319 } 320 if (trusted == 0) { 321 xauthdir = xmalloc(MAXPATHLEN); 322 xauthfile = xmalloc(MAXPATHLEN); 323 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); 324 if (mkdtemp(xauthdir) != NULL) { 325 do_unlink = 1; 326 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", 327 xauthdir); 328 snprintf(cmd, sizeof(cmd), 329 "%s -f %s generate %s " SSH_X11_PROTO 330 " untrusted timeout %u 2>" _PATH_DEVNULL, 331 xauth_path, xauthfile, display, timeout); 332 debug2("x11_get_proto: %s", cmd); 333 if (system(cmd) == 0) 334 generated = 1; 335 if (x11_refuse_time == 0) { 336 now = time(NULL) + 1; 337 if (UINT_MAX - timeout < now) 338 x11_refuse_time = UINT_MAX; 339 else 340 x11_refuse_time = now + timeout; 341 } 342 } 343 } 344 345 /* 346 * When in untrusted mode, we read the cookie only if it was 347 * successfully generated as an untrusted one in the step 348 * above. 349 */ 350 if (trusted || generated) { 351 snprintf(cmd, sizeof(cmd), 352 "%s %s%s list %s 2>" _PATH_DEVNULL, 353 xauth_path, 354 generated ? "-f " : "" , 355 generated ? xauthfile : "", 356 display); 357 debug2("x11_get_proto: %s", cmd); 358 f = popen(cmd, "r"); 359 if (f && fgets(line, sizeof(line), f) && 360 sscanf(line, "%*s %511s %511s", proto, data) == 2) 361 got_data = 1; 362 if (f) 363 pclose(f); 364 } else 365 error("Warning: untrusted X11 forwarding setup failed: " 366 "xauth key data not generated"); 367 } 368 369 if (do_unlink) { 370 unlink(xauthfile); 371 rmdir(xauthdir); 372 } 373 if (xauthdir) 374 xfree(xauthdir); 375 if (xauthfile) 376 xfree(xauthfile); 377 378 /* 379 * If we didn't get authentication data, just make up some 380 * data. The forwarding code will check the validity of the 381 * response anyway, and substitute this data. The X11 382 * server, however, will ignore this fake data and use 383 * whatever authentication mechanisms it was using otherwise 384 * for the local connection. 385 */ 386 if (!got_data) { 387 u_int32_t rnd = 0; 388 389 logit("Warning: No xauth data; " 390 "using fake authentication data for X11 forwarding."); 391 strlcpy(proto, SSH_X11_PROTO, sizeof proto); 392 for (i = 0; i < 16; i++) { 393 if (i % 4 == 0) 394 rnd = arc4random(); 395 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", 396 rnd & 0xff); 397 rnd >>= 8; 398 } 399 } 400 } 401 402 /* 403 * This is called when the interactive is entered. This checks if there is 404 * an EOF coming on stdin. We must check this explicitly, as select() does 405 * not appear to wake up when redirecting from /dev/null. 406 */ 407 408 static void 409 client_check_initial_eof_on_stdin(void) 410 { 411 int len; 412 char buf[1]; 413 414 /* 415 * If standard input is to be "redirected from /dev/null", we simply 416 * mark that we have seen an EOF and send an EOF message to the 417 * server. Otherwise, we try to read a single character; it appears 418 * that for some files, such /dev/null, select() never wakes up for 419 * read for this descriptor, which means that we never get EOF. This 420 * way we will get the EOF if stdin comes from /dev/null or similar. 421 */ 422 if (stdin_null_flag) { 423 /* Fake EOF on stdin. */ 424 debug("Sending eof."); 425 stdin_eof = 1; 426 packet_start(SSH_CMSG_EOF); 427 packet_send(); 428 } else { 429 enter_non_blocking(); 430 431 /* Check for immediate EOF on stdin. */ 432 len = read(fileno(stdin), buf, 1); 433 if (len == 0) { 434 /* 435 * EOF. Record that we have seen it and send 436 * EOF to server. 437 */ 438 debug("Sending eof."); 439 stdin_eof = 1; 440 packet_start(SSH_CMSG_EOF); 441 packet_send(); 442 } else if (len > 0) { 443 /* 444 * Got data. We must store the data in the buffer, 445 * and also process it as an escape character if 446 * appropriate. 447 */ 448 if ((u_char) buf[0] == escape_char1) 449 escape_pending1 = 1; 450 else 451 buffer_append(&stdin_buffer, buf, 1); 452 } 453 leave_non_blocking(); 454 } 455 } 456 457 458 /* 459 * Make packets from buffered stdin data, and buffer them for sending to the 460 * connection. 461 */ 462 463 static void 464 client_make_packets_from_stdin_data(void) 465 { 466 u_int len; 467 468 /* Send buffered stdin data to the server. */ 469 while (buffer_len(&stdin_buffer) > 0 && 470 packet_not_very_much_data_to_write()) { 471 len = buffer_len(&stdin_buffer); 472 /* Keep the packets at reasonable size. */ 473 if (len > packet_get_maxsize()) 474 len = packet_get_maxsize(); 475 packet_start(SSH_CMSG_STDIN_DATA); 476 packet_put_string(buffer_ptr(&stdin_buffer), len); 477 packet_send(); 478 buffer_consume(&stdin_buffer, len); 479 /* If we have a pending EOF, send it now. */ 480 if (stdin_eof && buffer_len(&stdin_buffer) == 0) { 481 packet_start(SSH_CMSG_EOF); 482 packet_send(); 483 } 484 } 485 } 486 487 /* 488 * Checks if the client window has changed, and sends a packet about it to 489 * the server if so. The actual change is detected elsewhere (by a software 490 * interrupt on Unix); this just checks the flag and sends a message if 491 * appropriate. 492 */ 493 494 static void 495 client_check_window_change(void) 496 { 497 struct winsize ws; 498 499 if (! received_window_change_signal) 500 return; 501 /** XXX race */ 502 received_window_change_signal = 0; 503 504 debug2("client_check_window_change: changed"); 505 506 if (compat20) { 507 channel_send_window_changes(); 508 } else { 509 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) 510 return; 511 packet_start(SSH_CMSG_WINDOW_SIZE); 512 packet_put_int((u_int)ws.ws_row); 513 packet_put_int((u_int)ws.ws_col); 514 packet_put_int((u_int)ws.ws_xpixel); 515 packet_put_int((u_int)ws.ws_ypixel); 516 packet_send(); 517 } 518 } 519 520 static void 521 client_global_request_reply(int type, u_int32_t seq, void *ctxt) 522 { 523 struct global_confirm *gc; 524 525 if ((gc = TAILQ_FIRST(&global_confirms)) == NULL) 526 return; 527 if (gc->cb != NULL) 528 gc->cb(type, seq, gc->ctx); 529 if (--gc->ref_count <= 0) { 530 TAILQ_REMOVE(&global_confirms, gc, entry); 531 bzero(gc, sizeof(*gc)); 532 xfree(gc); 533 } 534 535 packet_set_alive_timeouts(0); 536 } 537 538 static void 539 server_alive_check(void) 540 { 541 if (packet_inc_alive_timeouts() > options.server_alive_count_max) { 542 logit("Timeout, server not responding."); 543 cleanup_exit(255); 544 } 545 packet_start(SSH2_MSG_GLOBAL_REQUEST); 546 packet_put_cstring("keepalive@openssh.com"); 547 packet_put_char(1); /* boolean: want reply */ 548 packet_send(); 549 /* Insert an empty placeholder to maintain ordering */ 550 client_register_global_confirm(NULL, NULL); 551 } 552 553 /* 554 * Waits until the client can do something (some data becomes available on 555 * one of the file descriptors). 556 */ 557 static void 558 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, 559 int *maxfdp, u_int *nallocp, int rekeying) 560 { 561 struct timeval tv, *tvp; 562 int timeout_secs; 563 int ret; 564 565 /* Add any selections by the channel mechanism. */ 566 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); 567 568 if (!compat20) { 569 /* Read from the connection, unless our buffers are full. */ 570 if (buffer_len(&stdout_buffer) < buffer_high && 571 buffer_len(&stderr_buffer) < buffer_high && 572 channel_not_very_much_buffered_data()) 573 FD_SET(connection_in, *readsetp); 574 /* 575 * Read from stdin, unless we have seen EOF or have very much 576 * buffered data to send to the server. 577 */ 578 if (!stdin_eof && packet_not_very_much_data_to_write()) 579 FD_SET(fileno(stdin), *readsetp); 580 581 /* Select stdout/stderr if have data in buffer. */ 582 if (buffer_len(&stdout_buffer) > 0) 583 FD_SET(fileno(stdout), *writesetp); 584 if (buffer_len(&stderr_buffer) > 0) 585 FD_SET(fileno(stderr), *writesetp); 586 } else { 587 /* channel_prepare_select could have closed the last channel */ 588 if (session_closed && !channel_still_open() && 589 !packet_have_data_to_write()) { 590 /* clear mask since we did not call select() */ 591 memset(*readsetp, 0, *nallocp); 592 memset(*writesetp, 0, *nallocp); 593 return; 594 } else { 595 FD_SET(connection_in, *readsetp); 596 } 597 } 598 599 /* Select server connection if have data to write to the server. */ 600 if (packet_have_data_to_write()) 601 FD_SET(connection_out, *writesetp); 602 603 /* 604 * Wait for something to happen. This will suspend the process until 605 * some selected descriptor can be read, written, or has some other 606 * event pending, or a timeout expires. 607 */ 608 609 timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */ 610 if (options.server_alive_interval > 0 && compat20) 611 timeout_secs = options.server_alive_interval; 612 set_control_persist_exit_time(); 613 if (control_persist_exit_time > 0) { 614 timeout_secs = MIN(timeout_secs, 615 control_persist_exit_time - time(NULL)); 616 if (timeout_secs < 0) 617 timeout_secs = 0; 618 } 619 if (timeout_secs == INT_MAX) 620 tvp = NULL; 621 else { 622 tv.tv_sec = timeout_secs; 623 tv.tv_usec = 0; 624 tvp = &tv; 625 } 626 627 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); 628 if (ret < 0) { 629 char buf[100]; 630 631 /* 632 * We have to clear the select masks, because we return. 633 * We have to return, because the mainloop checks for the flags 634 * set by the signal handlers. 635 */ 636 memset(*readsetp, 0, *nallocp); 637 memset(*writesetp, 0, *nallocp); 638 639 if (errno == EINTR) 640 return; 641 /* Note: we might still have data in the buffers. */ 642 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); 643 buffer_append(&stderr_buffer, buf, strlen(buf)); 644 quit_pending = 1; 645 } else if (ret == 0) 646 server_alive_check(); 647 } 648 649 static void 650 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) 651 { 652 /* Flush stdout and stderr buffers. */ 653 if (buffer_len(bout) > 0) 654 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), 655 buffer_len(bout)); 656 if (buffer_len(berr) > 0) 657 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), 658 buffer_len(berr)); 659 660 leave_raw_mode(force_tty_flag); 661 662 /* 663 * Free (and clear) the buffer to reduce the amount of data that gets 664 * written to swap. 665 */ 666 buffer_free(bin); 667 buffer_free(bout); 668 buffer_free(berr); 669 670 /* Send the suspend signal to the program itself. */ 671 kill(getpid(), SIGTSTP); 672 673 /* Reset window sizes in case they have changed */ 674 received_window_change_signal = 1; 675 676 /* OK, we have been continued by the user. Reinitialize buffers. */ 677 buffer_init(bin); 678 buffer_init(bout); 679 buffer_init(berr); 680 681 enter_raw_mode(force_tty_flag); 682 } 683 684 static void 685 client_process_net_input(fd_set *readset) 686 { 687 int len, cont = 0; 688 char buf[8192]; 689 690 /* 691 * Read input from the server, and add any such data to the buffer of 692 * the packet subsystem. 693 */ 694 if (FD_ISSET(connection_in, readset)) { 695 /* Read as much as possible. */ 696 len = roaming_read(connection_in, buf, sizeof(buf), &cont); 697 if (len == 0 && cont == 0) { 698 /* 699 * Received EOF. The remote host has closed the 700 * connection. 701 */ 702 snprintf(buf, sizeof buf, 703 "Connection to %.300s closed by remote host.\r\n", 704 host); 705 buffer_append(&stderr_buffer, buf, strlen(buf)); 706 quit_pending = 1; 707 return; 708 } 709 /* 710 * There is a kernel bug on Solaris that causes select to 711 * sometimes wake up even though there is no data available. 712 */ 713 if (len < 0 && (errno == EAGAIN || errno == EINTR)) 714 len = 0; 715 716 if (len < 0) { 717 /* 718 * An error has encountered. Perhaps there is a 719 * network problem. 720 */ 721 snprintf(buf, sizeof buf, 722 "Read from remote host %.300s: %.100s\r\n", 723 host, strerror(errno)); 724 buffer_append(&stderr_buffer, buf, strlen(buf)); 725 quit_pending = 1; 726 return; 727 } 728 packet_process_incoming(buf, len); 729 } 730 } 731 732 static void 733 client_status_confirm(int type, Channel *c, void *ctx) 734 { 735 struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx; 736 char errmsg[256]; 737 int tochan; 738 739 /* XXX supress on mux _client_ quietmode */ 740 tochan = options.log_level >= SYSLOG_LEVEL_ERROR && 741 c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE; 742 743 if (type == SSH2_MSG_CHANNEL_SUCCESS) { 744 debug2("%s request accepted on channel %d", 745 cr->request_type, c->self); 746 } else if (type == SSH2_MSG_CHANNEL_FAILURE) { 747 if (tochan) { 748 snprintf(errmsg, sizeof(errmsg), 749 "%s request failed\r\n", cr->request_type); 750 } else { 751 snprintf(errmsg, sizeof(errmsg), 752 "%s request failed on channel %d", 753 cr->request_type, c->self); 754 } 755 /* If error occurred on primary session channel, then exit */ 756 if (cr->do_close && c->self == session_ident) 757 fatal("%s", errmsg); 758 /* If error occurred on mux client, append to their stderr */ 759 if (tochan) 760 buffer_append(&c->extended, errmsg, strlen(errmsg)); 761 else 762 error("%s", errmsg); 763 if (cr->do_close) { 764 chan_read_failed(c); 765 chan_write_failed(c); 766 } 767 } 768 xfree(cr); 769 } 770 771 static void 772 client_abandon_status_confirm(Channel *c, void *ctx) 773 { 774 xfree(ctx); 775 } 776 777 static void 778 client_expect_confirm(int id, const char *request, int do_close) 779 { 780 struct channel_reply_ctx *cr = xmalloc(sizeof(*cr)); 781 782 cr->request_type = request; 783 cr->do_close = do_close; 784 785 channel_register_status_confirm(id, client_status_confirm, 786 client_abandon_status_confirm, cr); 787 } 788 789 void 790 client_register_global_confirm(global_confirm_cb *cb, void *ctx) 791 { 792 struct global_confirm *gc, *last_gc; 793 794 /* Coalesce identical callbacks */ 795 last_gc = TAILQ_LAST(&global_confirms, global_confirms); 796 if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) { 797 if (++last_gc->ref_count >= INT_MAX) 798 fatal("%s: last_gc->ref_count = %d", 799 __func__, last_gc->ref_count); 800 return; 801 } 802 803 gc = xmalloc(sizeof(*gc)); 804 gc->cb = cb; 805 gc->ctx = ctx; 806 gc->ref_count = 1; 807 TAILQ_INSERT_TAIL(&global_confirms, gc, entry); 808 } 809 810 static void 811 process_cmdline(void) 812 { 813 void (*handler)(int); 814 char *s, *cmd, *cancel_host; 815 int delete = 0; 816 int local = 0, remote = 0, dynamic = 0; 817 int cancel_port; 818 Forward fwd; 819 820 bzero(&fwd, sizeof(fwd)); 821 fwd.listen_host = fwd.connect_host = NULL; 822 823 leave_raw_mode(force_tty_flag); 824 handler = signal(SIGINT, SIG_IGN); 825 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); 826 if (s == NULL) 827 goto out; 828 while (isspace((unsigned char)*s)) 829 s++; 830 if (*s == '-') 831 s++; /* Skip cmdline '-', if any */ 832 if (*s == '\0') 833 goto out; 834 835 if (*s == 'h' || *s == 'H' || *s == '?') { 836 logit("Commands:"); 837 logit(" -L[bind_address:]port:host:hostport " 838 "Request local forward"); 839 logit(" -R[bind_address:]port:host:hostport " 840 "Request remote forward"); 841 logit(" -D[bind_address:]port " 842 "Request dynamic forward"); 843 logit(" -KR[bind_address:]port " 844 "Cancel remote forward"); 845 if (!options.permit_local_command) 846 goto out; 847 logit(" !args " 848 "Execute local command"); 849 goto out; 850 } 851 852 if (*s == '!' && options.permit_local_command) { 853 s++; 854 ssh_local_cmd(s); 855 goto out; 856 } 857 858 if (*s == 'K') { 859 delete = 1; 860 s++; 861 } 862 if (*s == 'L') 863 local = 1; 864 else if (*s == 'R') 865 remote = 1; 866 else if (*s == 'D') 867 dynamic = 1; 868 else { 869 logit("Invalid command."); 870 goto out; 871 } 872 873 if ((local || dynamic) && delete) { 874 logit("Not supported."); 875 goto out; 876 } 877 if (remote && delete && !compat20) { 878 logit("Not supported for SSH protocol version 1."); 879 goto out; 880 } 881 882 s++; 883 while (isspace((unsigned char)*s)) 884 s++; 885 886 /* XXX update list of forwards in options */ 887 if (delete) { 888 cancel_port = 0; 889 cancel_host = hpdelim(&s); /* may be NULL */ 890 if (s != NULL) { 891 cancel_port = a2port(s); 892 cancel_host = cleanhostname(cancel_host); 893 } else { 894 cancel_port = a2port(cancel_host); 895 cancel_host = NULL; 896 } 897 if (cancel_port <= 0) { 898 logit("Bad forwarding close port"); 899 goto out; 900 } 901 channel_request_rforward_cancel(cancel_host, cancel_port); 902 } else { 903 if (!parse_forward(&fwd, s, dynamic, remote)) { 904 logit("Bad forwarding specification."); 905 goto out; 906 } 907 if (local || dynamic) { 908 if (channel_setup_local_fwd_listener(fwd.listen_host, 909 fwd.listen_port, fwd.connect_host, 910 fwd.connect_port, options.gateway_ports) < 0) { 911 logit("Port forwarding failed."); 912 goto out; 913 } 914 } else { 915 if (channel_request_remote_forwarding(fwd.listen_host, 916 fwd.listen_port, fwd.connect_host, 917 fwd.connect_port) < 0) { 918 logit("Port forwarding failed."); 919 goto out; 920 } 921 } 922 923 logit("Forwarding port."); 924 } 925 926 out: 927 signal(SIGINT, handler); 928 enter_raw_mode(force_tty_flag); 929 if (cmd) 930 xfree(cmd); 931 if (fwd.listen_host != NULL) 932 xfree(fwd.listen_host); 933 if (fwd.connect_host != NULL) 934 xfree(fwd.connect_host); 935 } 936 937 /* 938 * Process the characters one by one, call with c==NULL for proto1 case. 939 */ 940 static int 941 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr, 942 char *buf, int len) 943 { 944 char string[1024]; 945 pid_t pid; 946 int bytes = 0; 947 u_int i; 948 u_char ch; 949 char *s; 950 int *escape_pendingp, escape_char; 951 struct escape_filter_ctx *efc; 952 953 if (c == NULL) { 954 escape_pendingp = &escape_pending1; 955 escape_char = escape_char1; 956 } else { 957 if (c->filter_ctx == NULL) 958 return 0; 959 efc = (struct escape_filter_ctx *)c->filter_ctx; 960 escape_pendingp = &efc->escape_pending; 961 escape_char = efc->escape_char; 962 } 963 964 if (len <= 0) 965 return (0); 966 967 for (i = 0; i < (u_int)len; i++) { 968 /* Get one character at a time. */ 969 ch = buf[i]; 970 971 if (*escape_pendingp) { 972 /* We have previously seen an escape character. */ 973 /* Clear the flag now. */ 974 *escape_pendingp = 0; 975 976 /* Process the escaped character. */ 977 switch (ch) { 978 case '.': 979 /* Terminate the connection. */ 980 snprintf(string, sizeof string, "%c.\r\n", 981 escape_char); 982 buffer_append(berr, string, strlen(string)); 983 984 if (c && c->ctl_chan != -1) { 985 chan_read_failed(c); 986 chan_write_failed(c); 987 return 0; 988 } else 989 quit_pending = 1; 990 return -1; 991 992 case 'Z' - 64: 993 /* XXX support this for mux clients */ 994 if (c && c->ctl_chan != -1) { 995 noescape: 996 snprintf(string, sizeof string, 997 "%c%c escape not available to " 998 "multiplexed sessions\r\n", 999 escape_char, ch); 1000 buffer_append(berr, string, 1001 strlen(string)); 1002 continue; 1003 } 1004 /* Suspend the program. Inform the user */ 1005 snprintf(string, sizeof string, 1006 "%c^Z [suspend ssh]\r\n", escape_char); 1007 buffer_append(berr, string, strlen(string)); 1008 1009 /* Restore terminal modes and suspend. */ 1010 client_suspend_self(bin, bout, berr); 1011 1012 /* We have been continued. */ 1013 continue; 1014 1015 case 'B': 1016 if (compat20) { 1017 snprintf(string, sizeof string, 1018 "%cB\r\n", escape_char); 1019 buffer_append(berr, string, 1020 strlen(string)); 1021 channel_request_start(session_ident, 1022 "break", 0); 1023 packet_put_int(1000); 1024 packet_send(); 1025 } 1026 continue; 1027 1028 case 'R': 1029 if (compat20) { 1030 if (datafellows & SSH_BUG_NOREKEY) 1031 logit("Server does not " 1032 "support re-keying"); 1033 else 1034 need_rekeying = 1; 1035 } 1036 continue; 1037 1038 case '&': 1039 if (c && c->ctl_chan != -1) 1040 goto noescape; 1041 /* 1042 * Detach the program (continue to serve 1043 * connections, but put in background and no 1044 * more new connections). 1045 */ 1046 /* Restore tty modes. */ 1047 leave_raw_mode(force_tty_flag); 1048 1049 /* Stop listening for new connections. */ 1050 channel_stop_listening(); 1051 1052 snprintf(string, sizeof string, 1053 "%c& [backgrounded]\n", escape_char); 1054 buffer_append(berr, string, strlen(string)); 1055 1056 /* Fork into background. */ 1057 pid = fork(); 1058 if (pid < 0) { 1059 error("fork: %.100s", strerror(errno)); 1060 continue; 1061 } 1062 if (pid != 0) { /* This is the parent. */ 1063 /* The parent just exits. */ 1064 exit(0); 1065 } 1066 /* The child continues serving connections. */ 1067 if (compat20) { 1068 buffer_append(bin, "\004", 1); 1069 /* fake EOF on stdin */ 1070 return -1; 1071 } else if (!stdin_eof) { 1072 /* 1073 * Sending SSH_CMSG_EOF alone does not 1074 * always appear to be enough. So we 1075 * try to send an EOF character first. 1076 */ 1077 packet_start(SSH_CMSG_STDIN_DATA); 1078 packet_put_string("\004", 1); 1079 packet_send(); 1080 /* Close stdin. */ 1081 stdin_eof = 1; 1082 if (buffer_len(bin) == 0) { 1083 packet_start(SSH_CMSG_EOF); 1084 packet_send(); 1085 } 1086 } 1087 continue; 1088 1089 case '?': 1090 if (c && c->ctl_chan != -1) { 1091 snprintf(string, sizeof string, 1092 "%c?\r\n\ 1093 Supported escape sequences:\r\n\ 1094 %c. - terminate session\r\n\ 1095 %cB - send a BREAK to the remote system\r\n\ 1096 %cR - Request rekey (SSH protocol 2 only)\r\n\ 1097 %c# - list forwarded connections\r\n\ 1098 %c? - this message\r\n\ 1099 %c%c - send the escape character by typing it twice\r\n\ 1100 (Note that escapes are only recognized immediately after newline.)\r\n", 1101 escape_char, escape_char, 1102 escape_char, escape_char, 1103 escape_char, escape_char, 1104 escape_char, escape_char); 1105 } else { 1106 snprintf(string, sizeof string, 1107 "%c?\r\n\ 1108 Supported escape sequences:\r\n\ 1109 %c. - terminate connection (and any multiplexed sessions)\r\n\ 1110 %cB - send a BREAK to the remote system\r\n\ 1111 %cC - open a command line\r\n\ 1112 %cR - Request rekey (SSH protocol 2 only)\r\n\ 1113 %c^Z - suspend ssh\r\n\ 1114 %c# - list forwarded connections\r\n\ 1115 %c& - background ssh (when waiting for connections to terminate)\r\n\ 1116 %c? - this message\r\n\ 1117 %c%c - send the escape character by typing it twice\r\n\ 1118 (Note that escapes are only recognized immediately after newline.)\r\n", 1119 escape_char, escape_char, 1120 escape_char, escape_char, 1121 escape_char, escape_char, 1122 escape_char, escape_char, 1123 escape_char, escape_char, 1124 escape_char); 1125 } 1126 buffer_append(berr, string, strlen(string)); 1127 continue; 1128 1129 case '#': 1130 snprintf(string, sizeof string, "%c#\r\n", 1131 escape_char); 1132 buffer_append(berr, string, strlen(string)); 1133 s = channel_open_message(); 1134 buffer_append(berr, s, strlen(s)); 1135 xfree(s); 1136 continue; 1137 1138 case 'C': 1139 if (c && c->ctl_chan != -1) 1140 goto noescape; 1141 process_cmdline(); 1142 continue; 1143 1144 default: 1145 if (ch != escape_char) { 1146 buffer_put_char(bin, escape_char); 1147 bytes++; 1148 } 1149 /* Escaped characters fall through here */ 1150 break; 1151 } 1152 } else { 1153 /* 1154 * The previous character was not an escape char. 1155 * Check if this is an escape. 1156 */ 1157 if (last_was_cr && ch == escape_char) { 1158 /* 1159 * It is. Set the flag and continue to 1160 * next character. 1161 */ 1162 *escape_pendingp = 1; 1163 continue; 1164 } 1165 } 1166 1167 /* 1168 * Normal character. Record whether it was a newline, 1169 * and append it to the buffer. 1170 */ 1171 last_was_cr = (ch == '\r' || ch == '\n'); 1172 buffer_put_char(bin, ch); 1173 bytes++; 1174 } 1175 return bytes; 1176 } 1177 1178 static void 1179 client_process_input(fd_set *readset) 1180 { 1181 int len; 1182 char buf[8192]; 1183 1184 /* Read input from stdin. */ 1185 if (FD_ISSET(fileno(stdin), readset)) { 1186 /* Read as much as possible. */ 1187 len = read(fileno(stdin), buf, sizeof(buf)); 1188 if (len < 0 && (errno == EAGAIN || errno == EINTR)) 1189 return; /* we'll try again later */ 1190 if (len <= 0) { 1191 /* 1192 * Received EOF or error. They are treated 1193 * similarly, except that an error message is printed 1194 * if it was an error condition. 1195 */ 1196 if (len < 0) { 1197 snprintf(buf, sizeof buf, "read: %.100s\r\n", 1198 strerror(errno)); 1199 buffer_append(&stderr_buffer, buf, strlen(buf)); 1200 } 1201 /* Mark that we have seen EOF. */ 1202 stdin_eof = 1; 1203 /* 1204 * Send an EOF message to the server unless there is 1205 * data in the buffer. If there is data in the 1206 * buffer, no message will be sent now. Code 1207 * elsewhere will send the EOF when the buffer 1208 * becomes empty if stdin_eof is set. 1209 */ 1210 if (buffer_len(&stdin_buffer) == 0) { 1211 packet_start(SSH_CMSG_EOF); 1212 packet_send(); 1213 } 1214 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) { 1215 /* 1216 * Normal successful read, and no escape character. 1217 * Just append the data to buffer. 1218 */ 1219 buffer_append(&stdin_buffer, buf, len); 1220 } else { 1221 /* 1222 * Normal, successful read. But we have an escape 1223 * character and have to process the characters one 1224 * by one. 1225 */ 1226 if (process_escapes(NULL, &stdin_buffer, 1227 &stdout_buffer, &stderr_buffer, buf, len) == -1) 1228 return; 1229 } 1230 } 1231 } 1232 1233 static void 1234 client_process_output(fd_set *writeset) 1235 { 1236 int len; 1237 char buf[100]; 1238 1239 /* Write buffered output to stdout. */ 1240 if (FD_ISSET(fileno(stdout), writeset)) { 1241 /* Write as much data as possible. */ 1242 len = write(fileno(stdout), buffer_ptr(&stdout_buffer), 1243 buffer_len(&stdout_buffer)); 1244 if (len <= 0) { 1245 if (errno == EINTR || errno == EAGAIN) 1246 len = 0; 1247 else { 1248 /* 1249 * An error or EOF was encountered. Put an 1250 * error message to stderr buffer. 1251 */ 1252 snprintf(buf, sizeof buf, 1253 "write stdout: %.50s\r\n", strerror(errno)); 1254 buffer_append(&stderr_buffer, buf, strlen(buf)); 1255 quit_pending = 1; 1256 return; 1257 } 1258 } 1259 /* Consume printed data from the buffer. */ 1260 buffer_consume(&stdout_buffer, len); 1261 } 1262 /* Write buffered output to stderr. */ 1263 if (FD_ISSET(fileno(stderr), writeset)) { 1264 /* Write as much data as possible. */ 1265 len = write(fileno(stderr), buffer_ptr(&stderr_buffer), 1266 buffer_len(&stderr_buffer)); 1267 if (len <= 0) { 1268 if (errno == EINTR || errno == EAGAIN) 1269 len = 0; 1270 else { 1271 /* 1272 * EOF or error, but can't even print 1273 * error message. 1274 */ 1275 quit_pending = 1; 1276 return; 1277 } 1278 } 1279 /* Consume printed characters from the buffer. */ 1280 buffer_consume(&stderr_buffer, len); 1281 } 1282 } 1283 1284 /* 1285 * Get packets from the connection input buffer, and process them as long as 1286 * there are packets available. 1287 * 1288 * Any unknown packets received during the actual 1289 * session cause the session to terminate. This is 1290 * intended to make debugging easier since no 1291 * confirmations are sent. Any compatible protocol 1292 * extensions must be negotiated during the 1293 * preparatory phase. 1294 */ 1295 1296 static void 1297 client_process_buffered_input_packets(void) 1298 { 1299 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, 1300 compat20 ? xxx_kex : NULL); 1301 } 1302 1303 /* scan buf[] for '~' before sending data to the peer */ 1304 1305 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */ 1306 void * 1307 client_new_escape_filter_ctx(int escape_char) 1308 { 1309 struct escape_filter_ctx *ret; 1310 1311 ret = xmalloc(sizeof(*ret)); 1312 ret->escape_pending = 0; 1313 ret->escape_char = escape_char; 1314 return (void *)ret; 1315 } 1316 1317 /* Free the escape filter context on channel free */ 1318 void 1319 client_filter_cleanup(int cid, void *ctx) 1320 { 1321 xfree(ctx); 1322 } 1323 1324 int 1325 client_simple_escape_filter(Channel *c, char *buf, int len) 1326 { 1327 if (c->extended_usage != CHAN_EXTENDED_WRITE) 1328 return 0; 1329 1330 return process_escapes(c, &c->input, &c->output, &c->extended, 1331 buf, len); 1332 } 1333 1334 static void 1335 client_channel_closed(int id, void *arg) 1336 { 1337 channel_cancel_cleanup(id); 1338 session_closed = 1; 1339 leave_raw_mode(force_tty_flag); 1340 } 1341 1342 /* 1343 * Implements the interactive session with the server. This is called after 1344 * the user has been authenticated, and a command has been started on the 1345 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character 1346 * used as an escape character for terminating or suspending the session. 1347 */ 1348 1349 int 1350 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) 1351 { 1352 fd_set *readset = NULL, *writeset = NULL; 1353 double start_time, total_time; 1354 int max_fd = 0, max_fd2 = 0, len, rekeying = 0; 1355 u_int64_t ibytes, obytes; 1356 u_int nalloc = 0; 1357 char buf[100]; 1358 1359 debug("Entering interactive session."); 1360 1361 start_time = get_current_time(); 1362 1363 /* Initialize variables. */ 1364 escape_pending1 = 0; 1365 last_was_cr = 1; 1366 exit_status = -1; 1367 stdin_eof = 0; 1368 buffer_high = 64 * 1024; 1369 connection_in = packet_get_connection_in(); 1370 connection_out = packet_get_connection_out(); 1371 max_fd = MAX(connection_in, connection_out); 1372 1373 if (!compat20) { 1374 /* enable nonblocking unless tty */ 1375 if (!isatty(fileno(stdin))) 1376 set_nonblock(fileno(stdin)); 1377 if (!isatty(fileno(stdout))) 1378 set_nonblock(fileno(stdout)); 1379 if (!isatty(fileno(stderr))) 1380 set_nonblock(fileno(stderr)); 1381 max_fd = MAX(max_fd, fileno(stdin)); 1382 max_fd = MAX(max_fd, fileno(stdout)); 1383 max_fd = MAX(max_fd, fileno(stderr)); 1384 } 1385 quit_pending = 0; 1386 escape_char1 = escape_char_arg; 1387 1388 /* Initialize buffers. */ 1389 buffer_init(&stdin_buffer); 1390 buffer_init(&stdout_buffer); 1391 buffer_init(&stderr_buffer); 1392 1393 client_init_dispatch(); 1394 1395 /* 1396 * Set signal handlers, (e.g. to restore non-blocking mode) 1397 * but don't overwrite SIG_IGN, matches behaviour from rsh(1) 1398 */ 1399 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) 1400 signal(SIGHUP, signal_handler); 1401 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 1402 signal(SIGINT, signal_handler); 1403 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) 1404 signal(SIGQUIT, signal_handler); 1405 if (signal(SIGTERM, SIG_IGN) != SIG_IGN) 1406 signal(SIGTERM, signal_handler); 1407 signal(SIGWINCH, window_change_handler); 1408 1409 if (have_pty) 1410 enter_raw_mode(force_tty_flag); 1411 1412 if (compat20) { 1413 session_ident = ssh2_chan_id; 1414 if (escape_char_arg != SSH_ESCAPECHAR_NONE) 1415 channel_register_filter(session_ident, 1416 client_simple_escape_filter, NULL, 1417 client_filter_cleanup, 1418 client_new_escape_filter_ctx(escape_char_arg)); 1419 if (session_ident != -1) 1420 channel_register_cleanup(session_ident, 1421 client_channel_closed, 0); 1422 } else { 1423 /* Check if we should immediately send eof on stdin. */ 1424 client_check_initial_eof_on_stdin(); 1425 } 1426 1427 /* Main loop of the client for the interactive session mode. */ 1428 while (!quit_pending) { 1429 1430 /* Process buffered packets sent by the server. */ 1431 client_process_buffered_input_packets(); 1432 1433 if (compat20 && session_closed && !channel_still_open()) 1434 break; 1435 1436 rekeying = (xxx_kex != NULL && !xxx_kex->done); 1437 1438 if (rekeying) { 1439 debug("rekeying in progress"); 1440 } else { 1441 /* 1442 * Make packets of buffered stdin data, and buffer 1443 * them for sending to the server. 1444 */ 1445 if (!compat20) 1446 client_make_packets_from_stdin_data(); 1447 1448 /* 1449 * Make packets from buffered channel data, and 1450 * enqueue them for sending to the server. 1451 */ 1452 if (packet_not_very_much_data_to_write()) 1453 channel_output_poll(); 1454 1455 /* 1456 * Check if the window size has changed, and buffer a 1457 * message about it to the server if so. 1458 */ 1459 client_check_window_change(); 1460 1461 if (quit_pending) 1462 break; 1463 } 1464 /* 1465 * Wait until we have something to do (something becomes 1466 * available on one of the descriptors). 1467 */ 1468 max_fd2 = max_fd; 1469 client_wait_until_can_do_something(&readset, &writeset, 1470 &max_fd2, &nalloc, rekeying); 1471 1472 if (quit_pending) 1473 break; 1474 1475 /* Do channel operations unless rekeying in progress. */ 1476 if (!rekeying) { 1477 channel_after_select(readset, writeset); 1478 if (need_rekeying || packet_need_rekeying()) { 1479 debug("need rekeying"); 1480 xxx_kex->done = 0; 1481 kex_send_kexinit(xxx_kex); 1482 need_rekeying = 0; 1483 } 1484 } 1485 1486 /* Buffer input from the connection. */ 1487 client_process_net_input(readset); 1488 1489 if (quit_pending) 1490 break; 1491 1492 if (!compat20) { 1493 /* Buffer data from stdin */ 1494 client_process_input(readset); 1495 /* 1496 * Process output to stdout and stderr. Output to 1497 * the connection is processed elsewhere (above). 1498 */ 1499 client_process_output(writeset); 1500 } 1501 1502 if (session_resumed) { 1503 connection_in = packet_get_connection_in(); 1504 connection_out = packet_get_connection_out(); 1505 max_fd = MAX(max_fd, connection_out); 1506 max_fd = MAX(max_fd, connection_in); 1507 session_resumed = 0; 1508 } 1509 1510 /* 1511 * Send as much buffered packet data as possible to the 1512 * sender. 1513 */ 1514 if (FD_ISSET(connection_out, writeset)) 1515 packet_write_poll(); 1516 1517 /* 1518 * If we are a backgrounded control master, and the 1519 * timeout has expired without any active client 1520 * connections, then quit. 1521 */ 1522 if (control_persist_exit_time > 0) { 1523 if (time(NULL) >= control_persist_exit_time) { 1524 debug("ControlPersist timeout expired"); 1525 break; 1526 } 1527 } 1528 } 1529 if (readset) 1530 xfree(readset); 1531 if (writeset) 1532 xfree(writeset); 1533 1534 /* Terminate the session. */ 1535 1536 /* Stop watching for window change. */ 1537 signal(SIGWINCH, SIG_DFL); 1538 1539 if (compat20) { 1540 packet_start(SSH2_MSG_DISCONNECT); 1541 packet_put_int(SSH2_DISCONNECT_BY_APPLICATION); 1542 packet_put_cstring("disconnected by user"); 1543 packet_put_cstring(""); /* language tag */ 1544 packet_send(); 1545 packet_write_wait(); 1546 } 1547 1548 channel_free_all(); 1549 1550 if (have_pty) 1551 leave_raw_mode(force_tty_flag); 1552 1553 /* restore blocking io */ 1554 if (!isatty(fileno(stdin))) 1555 unset_nonblock(fileno(stdin)); 1556 if (!isatty(fileno(stdout))) 1557 unset_nonblock(fileno(stdout)); 1558 if (!isatty(fileno(stderr))) 1559 unset_nonblock(fileno(stderr)); 1560 1561 /* 1562 * If there was no shell or command requested, there will be no remote 1563 * exit status to be returned. In that case, clear error code if the 1564 * connection was deliberately terminated at this end. 1565 */ 1566 if (no_shell_flag && received_signal == SIGTERM) { 1567 received_signal = 0; 1568 exit_status = 0; 1569 } 1570 1571 if (received_signal) 1572 fatal("Killed by signal %d.", (int) received_signal); 1573 1574 /* 1575 * In interactive mode (with pseudo tty) display a message indicating 1576 * that the connection has been closed. 1577 */ 1578 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { 1579 snprintf(buf, sizeof buf, 1580 "Connection to %.64s closed.\r\n", host); 1581 buffer_append(&stderr_buffer, buf, strlen(buf)); 1582 } 1583 1584 /* Output any buffered data for stdout. */ 1585 while (buffer_len(&stdout_buffer) > 0) { 1586 len = write(fileno(stdout), buffer_ptr(&stdout_buffer), 1587 buffer_len(&stdout_buffer)); 1588 if (len <= 0) { 1589 error("Write failed flushing stdout buffer."); 1590 break; 1591 } 1592 buffer_consume(&stdout_buffer, len); 1593 } 1594 1595 /* Output any buffered data for stderr. */ 1596 while (buffer_len(&stderr_buffer) > 0) { 1597 len = write(fileno(stderr), buffer_ptr(&stderr_buffer), 1598 buffer_len(&stderr_buffer)); 1599 if (len <= 0) { 1600 error("Write failed flushing stderr buffer."); 1601 break; 1602 } 1603 buffer_consume(&stderr_buffer, len); 1604 } 1605 1606 /* Clear and free any buffers. */ 1607 memset(buf, 0, sizeof(buf)); 1608 buffer_free(&stdin_buffer); 1609 buffer_free(&stdout_buffer); 1610 buffer_free(&stderr_buffer); 1611 1612 /* Report bytes transferred, and transfer rates. */ 1613 total_time = get_current_time() - start_time; 1614 packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes); 1615 packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes); 1616 verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds", 1617 (unsigned long long)obytes, (unsigned long long)ibytes, total_time); 1618 if (total_time > 0) 1619 verbose("Bytes per second: sent %.1f, received %.1f", 1620 obytes / total_time, ibytes / total_time); 1621 /* Return the exit status of the program. */ 1622 debug("Exit status %d", exit_status); 1623 return exit_status; 1624 } 1625 1626 /*********/ 1627 1628 static void 1629 client_input_stdout_data(int type, u_int32_t seq, void *ctxt) 1630 { 1631 u_int data_len; 1632 char *data = packet_get_string(&data_len); 1633 packet_check_eom(); 1634 buffer_append(&stdout_buffer, data, data_len); 1635 memset(data, 0, data_len); 1636 xfree(data); 1637 } 1638 static void 1639 client_input_stderr_data(int type, u_int32_t seq, void *ctxt) 1640 { 1641 u_int data_len; 1642 char *data = packet_get_string(&data_len); 1643 packet_check_eom(); 1644 buffer_append(&stderr_buffer, data, data_len); 1645 memset(data, 0, data_len); 1646 xfree(data); 1647 } 1648 static void 1649 client_input_exit_status(int type, u_int32_t seq, void *ctxt) 1650 { 1651 exit_status = packet_get_int(); 1652 packet_check_eom(); 1653 /* Acknowledge the exit. */ 1654 packet_start(SSH_CMSG_EXIT_CONFIRMATION); 1655 packet_send(); 1656 /* 1657 * Must wait for packet to be sent since we are 1658 * exiting the loop. 1659 */ 1660 packet_write_wait(); 1661 /* Flag that we want to exit. */ 1662 quit_pending = 1; 1663 } 1664 static void 1665 client_input_agent_open(int type, u_int32_t seq, void *ctxt) 1666 { 1667 Channel *c = NULL; 1668 int remote_id, sock; 1669 1670 /* Read the remote channel number from the message. */ 1671 remote_id = packet_get_int(); 1672 packet_check_eom(); 1673 1674 /* 1675 * Get a connection to the local authentication agent (this may again 1676 * get forwarded). 1677 */ 1678 sock = ssh_get_authentication_socket(); 1679 1680 /* 1681 * If we could not connect the agent, send an error message back to 1682 * the server. This should never happen unless the agent dies, 1683 * because authentication forwarding is only enabled if we have an 1684 * agent. 1685 */ 1686 if (sock >= 0) { 1687 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, 1688 -1, 0, 0, 0, "authentication agent connection", 1); 1689 c->remote_id = remote_id; 1690 c->force_drain = 1; 1691 } 1692 if (c == NULL) { 1693 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); 1694 packet_put_int(remote_id); 1695 } else { 1696 /* Send a confirmation to the remote host. */ 1697 debug("Forwarding authentication connection."); 1698 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); 1699 packet_put_int(remote_id); 1700 packet_put_int(c->self); 1701 } 1702 packet_send(); 1703 } 1704 1705 static Channel * 1706 client_request_forwarded_tcpip(const char *request_type, int rchan) 1707 { 1708 Channel *c = NULL; 1709 char *listen_address, *originator_address; 1710 u_short listen_port, originator_port; 1711 1712 /* Get rest of the packet */ 1713 listen_address = packet_get_string(NULL); 1714 listen_port = packet_get_int(); 1715 originator_address = packet_get_string(NULL); 1716 originator_port = packet_get_int(); 1717 packet_check_eom(); 1718 1719 debug("client_request_forwarded_tcpip: listen %s port %d, " 1720 "originator %s port %d", listen_address, listen_port, 1721 originator_address, originator_port); 1722 1723 c = channel_connect_by_listen_address(listen_port, 1724 "forwarded-tcpip", originator_address); 1725 1726 xfree(originator_address); 1727 xfree(listen_address); 1728 return c; 1729 } 1730 1731 static Channel * 1732 client_request_x11(const char *request_type, int rchan) 1733 { 1734 Channel *c = NULL; 1735 char *originator; 1736 u_short originator_port; 1737 int sock; 1738 1739 if (!options.forward_x11) { 1740 error("Warning: ssh server tried X11 forwarding."); 1741 error("Warning: this is probably a break-in attempt by a " 1742 "malicious server."); 1743 return NULL; 1744 } 1745 if (x11_refuse_time != 0 && time(NULL) >= x11_refuse_time) { 1746 verbose("Rejected X11 connection after ForwardX11Timeout " 1747 "expired"); 1748 return NULL; 1749 } 1750 originator = packet_get_string(NULL); 1751 if (datafellows & SSH_BUG_X11FWD) { 1752 debug2("buggy server: x11 request w/o originator_port"); 1753 originator_port = 0; 1754 } else { 1755 originator_port = packet_get_int(); 1756 } 1757 packet_check_eom(); 1758 /* XXX check permission */ 1759 debug("client_request_x11: request from %s %d", originator, 1760 originator_port); 1761 xfree(originator); 1762 sock = x11_connect_display(); 1763 if (sock < 0) 1764 return NULL; 1765 /* again is this really necessary for X11? */ 1766 if (options.hpn_disabled) 1767 c = channel_new("x11", 1768 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 1769 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); 1770 else 1771 c = channel_new("x11", 1772 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 1773 options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); 1774 c->force_drain = 1; 1775 return c; 1776 } 1777 1778 static Channel * 1779 client_request_agent(const char *request_type, int rchan) 1780 { 1781 Channel *c = NULL; 1782 int sock; 1783 1784 if (!options.forward_agent) { 1785 error("Warning: ssh server tried agent forwarding."); 1786 error("Warning: this is probably a break-in attempt by a " 1787 "malicious server."); 1788 return NULL; 1789 } 1790 sock = ssh_get_authentication_socket(); 1791 if (sock < 0) 1792 return NULL; 1793 if (options.hpn_disabled) 1794 c = channel_new("authentication agent connection", 1795 SSH_CHANNEL_OPEN, sock, sock, -1, 1796 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, 1797 "authentication agent connection", 1); 1798 else 1799 c = channel_new("authentication agent connection", 1800 SSH_CHANNEL_OPEN, sock, sock, -1, 1801 options.hpn_buffer_size, options.hpn_buffer_size, 0, 1802 "authentication agent connection", 1); 1803 c->force_drain = 1; 1804 return c; 1805 } 1806 1807 int 1808 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun) 1809 { 1810 Channel *c; 1811 int fd; 1812 1813 if (tun_mode == SSH_TUNMODE_NO) 1814 return 0; 1815 1816 if (!compat20) { 1817 error("Tunnel forwarding is not supported for protocol 1"); 1818 return -1; 1819 } 1820 1821 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode); 1822 1823 /* Open local tunnel device */ 1824 if ((fd = tun_open(local_tun, tun_mode)) == -1) { 1825 error("Tunnel device open failed."); 1826 return -1; 1827 } 1828 1829 if(options.hpn_disabled) 1830 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, 1831 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); 1832 else 1833 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, 1834 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); 1835 c->datagram = 1; 1836 1837 packet_start(SSH2_MSG_CHANNEL_OPEN); 1838 packet_put_cstring("tun@openssh.com"); 1839 packet_put_int(c->self); 1840 packet_put_int(c->local_window_max); 1841 packet_put_int(c->local_maxpacket); 1842 packet_put_int(tun_mode); 1843 packet_put_int(remote_tun); 1844 packet_send(); 1845 1846 return 0; 1847 } 1848 1849 /* XXXX move to generic input handler */ 1850 static void 1851 client_input_channel_open(int type, u_int32_t seq, void *ctxt) 1852 { 1853 Channel *c = NULL; 1854 char *ctype; 1855 int rchan; 1856 u_int rmaxpack, rwindow, len; 1857 1858 ctype = packet_get_string(&len); 1859 rchan = packet_get_int(); 1860 rwindow = packet_get_int(); 1861 rmaxpack = packet_get_int(); 1862 1863 debug("client_input_channel_open: ctype %s rchan %d win %d max %d", 1864 ctype, rchan, rwindow, rmaxpack); 1865 1866 if (strcmp(ctype, "forwarded-tcpip") == 0) { 1867 c = client_request_forwarded_tcpip(ctype, rchan); 1868 } else if (strcmp(ctype, "x11") == 0) { 1869 c = client_request_x11(ctype, rchan); 1870 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { 1871 c = client_request_agent(ctype, rchan); 1872 } 1873 /* XXX duplicate : */ 1874 if (c != NULL) { 1875 debug("confirm %s", ctype); 1876 c->remote_id = rchan; 1877 c->remote_window = rwindow; 1878 c->remote_maxpacket = rmaxpack; 1879 if (c->type != SSH_CHANNEL_CONNECTING) { 1880 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); 1881 packet_put_int(c->remote_id); 1882 packet_put_int(c->self); 1883 packet_put_int(c->local_window); 1884 packet_put_int(c->local_maxpacket); 1885 packet_send(); 1886 } 1887 } else { 1888 debug("failure %s", ctype); 1889 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); 1890 packet_put_int(rchan); 1891 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); 1892 if (!(datafellows & SSH_BUG_OPENFAILURE)) { 1893 packet_put_cstring("open failed"); 1894 packet_put_cstring(""); 1895 } 1896 packet_send(); 1897 } 1898 xfree(ctype); 1899 } 1900 static void 1901 client_input_channel_req(int type, u_int32_t seq, void *ctxt) 1902 { 1903 Channel *c = NULL; 1904 int exitval, id, reply, success = 0; 1905 char *rtype; 1906 1907 id = packet_get_int(); 1908 rtype = packet_get_string(NULL); 1909 reply = packet_get_char(); 1910 1911 debug("client_input_channel_req: channel %d rtype %s reply %d", 1912 id, rtype, reply); 1913 1914 if (id == -1) { 1915 error("client_input_channel_req: request for channel -1"); 1916 } else if ((c = channel_lookup(id)) == NULL) { 1917 error("client_input_channel_req: channel %d: " 1918 "unknown channel", id); 1919 } else if (strcmp(rtype, "eow@openssh.com") == 0) { 1920 packet_check_eom(); 1921 chan_rcvd_eow(c); 1922 } else if (strcmp(rtype, "exit-status") == 0) { 1923 exitval = packet_get_int(); 1924 if (c->ctl_chan != -1) { 1925 mux_exit_message(c, exitval); 1926 success = 1; 1927 } else if (id == session_ident) { 1928 /* Record exit value of local session */ 1929 success = 1; 1930 exit_status = exitval; 1931 } else { 1932 /* Probably for a mux channel that has already closed */ 1933 debug("%s: no sink for exit-status on channel %d", 1934 __func__, id); 1935 } 1936 packet_check_eom(); 1937 } 1938 if (reply) { 1939 packet_start(success ? 1940 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); 1941 packet_put_int(c->remote_id); 1942 packet_send(); 1943 } 1944 xfree(rtype); 1945 } 1946 static void 1947 client_input_global_request(int type, u_int32_t seq, void *ctxt) 1948 { 1949 char *rtype; 1950 int want_reply; 1951 int success = 0; 1952 1953 rtype = packet_get_string(NULL); 1954 want_reply = packet_get_char(); 1955 debug("client_input_global_request: rtype %s want_reply %d", 1956 rtype, want_reply); 1957 if (want_reply) { 1958 packet_start(success ? 1959 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); 1960 packet_send(); 1961 packet_write_wait(); 1962 } 1963 xfree(rtype); 1964 } 1965 1966 void 1967 client_session2_setup(int id, int want_tty, int want_subsystem, 1968 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env) 1969 { 1970 int len; 1971 Channel *c = NULL; 1972 1973 debug2("%s: id %d", __func__, id); 1974 1975 if ((c = channel_lookup(id)) == NULL) 1976 fatal("client_session2_setup: channel %d: unknown channel", id); 1977 1978 if (want_tty) { 1979 struct winsize ws; 1980 1981 /* Store window size in the packet. */ 1982 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) 1983 memset(&ws, 0, sizeof(ws)); 1984 1985 channel_request_start(id, "pty-req", 1); 1986 client_expect_confirm(id, "PTY allocation", 1); 1987 packet_put_cstring(term != NULL ? term : ""); 1988 packet_put_int((u_int)ws.ws_col); 1989 packet_put_int((u_int)ws.ws_row); 1990 packet_put_int((u_int)ws.ws_xpixel); 1991 packet_put_int((u_int)ws.ws_ypixel); 1992 if (tiop == NULL) 1993 tiop = get_saved_tio(); 1994 tty_make_modes(-1, tiop); 1995 packet_send(); 1996 /* XXX wait for reply */ 1997 c->client_tty = 1; 1998 } 1999 2000 /* Transfer any environment variables from client to server */ 2001 if (options.num_send_env != 0 && env != NULL) { 2002 int i, j, matched; 2003 char *name, *val; 2004 2005 debug("Sending environment."); 2006 for (i = 0; env[i] != NULL; i++) { 2007 /* Split */ 2008 name = xstrdup(env[i]); 2009 if ((val = strchr(name, '=')) == NULL) { 2010 xfree(name); 2011 continue; 2012 } 2013 *val++ = '\0'; 2014 2015 matched = 0; 2016 for (j = 0; j < options.num_send_env; j++) { 2017 if (match_pattern(name, options.send_env[j])) { 2018 matched = 1; 2019 break; 2020 } 2021 } 2022 if (!matched) { 2023 debug3("Ignored env %s", name); 2024 xfree(name); 2025 continue; 2026 } 2027 2028 debug("Sending env %s = %s", name, val); 2029 channel_request_start(id, "env", 0); 2030 packet_put_cstring(name); 2031 packet_put_cstring(val); 2032 packet_send(); 2033 xfree(name); 2034 } 2035 } 2036 2037 len = buffer_len(cmd); 2038 if (len > 0) { 2039 if (len > 900) 2040 len = 900; 2041 if (want_subsystem) { 2042 debug("Sending subsystem: %.*s", 2043 len, (u_char*)buffer_ptr(cmd)); 2044 channel_request_start(id, "subsystem", 1); 2045 client_expect_confirm(id, "subsystem", 1); 2046 } else { 2047 debug("Sending command: %.*s", 2048 len, (u_char*)buffer_ptr(cmd)); 2049 channel_request_start(id, "exec", 1); 2050 client_expect_confirm(id, "exec", 1); 2051 } 2052 packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); 2053 packet_send(); 2054 } else { 2055 channel_request_start(id, "shell", 1); 2056 client_expect_confirm(id, "shell", 1); 2057 packet_send(); 2058 } 2059 } 2060 2061 static void 2062 client_init_dispatch_20(void) 2063 { 2064 dispatch_init(&dispatch_protocol_error); 2065 2066 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); 2067 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); 2068 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); 2069 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); 2070 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); 2071 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 2072 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 2073 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); 2074 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); 2075 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm); 2076 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm); 2077 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); 2078 2079 /* rekeying */ 2080 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); 2081 2082 /* global request reply messages */ 2083 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); 2084 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); 2085 } 2086 2087 static void 2088 client_init_dispatch_13(void) 2089 { 2090 dispatch_init(NULL); 2091 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); 2092 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); 2093 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); 2094 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 2095 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 2096 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); 2097 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); 2098 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); 2099 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); 2100 2101 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? 2102 &client_input_agent_open : &deny_input_open); 2103 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? 2104 &x11_input_open : &deny_input_open); 2105 } 2106 2107 static void 2108 client_init_dispatch_15(void) 2109 { 2110 client_init_dispatch_13(); 2111 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); 2112 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); 2113 } 2114 2115 static void 2116 client_init_dispatch(void) 2117 { 2118 if (compat20) 2119 client_init_dispatch_20(); 2120 else if (compat13) 2121 client_init_dispatch_13(); 2122 else 2123 client_init_dispatch_15(); 2124 } 2125 2126 /* client specific fatal cleanup */ 2127 void 2128 cleanup_exit(int i) 2129 { 2130 leave_raw_mode(force_tty_flag); 2131 leave_non_blocking(); 2132 if (options.control_path != NULL && muxserver_sock != -1) 2133 unlink(options.control_path); 2134 _exit(i); 2135 } 2136