1 /* $OpenBSD: clientloop.c,v 1.231 2011/01/16 12:05:59 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 /* Force TTY allocation */ 134 extern int force_tty_flag; 135 136 /* 137 * Flag to indicate that we have received a window change signal which has 138 * not yet been processed. This will cause a message indicating the new 139 * window size to be sent to the server a little later. This is volatile 140 * because this is updated in a signal handler. 141 */ 142 static volatile sig_atomic_t received_window_change_signal = 0; 143 static volatile sig_atomic_t received_signal = 0; 144 145 /* Flag indicating whether the user's terminal is in non-blocking mode. */ 146 static int in_non_blocking_mode = 0; 147 148 /* Time when backgrounded control master using ControlPersist should exit */ 149 static time_t control_persist_exit_time = 0; 150 151 /* Common data for the client loop code. */ 152 volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */ 153 static int escape_char1; /* Escape character. (proto1 only) */ 154 static int escape_pending1; /* Last character was an escape (proto1 only) */ 155 static int last_was_cr; /* Last character was a newline. */ 156 static int exit_status; /* Used to store the command exit status. */ 157 static int stdin_eof; /* EOF has been encountered on stderr. */ 158 static Buffer stdin_buffer; /* Buffer for stdin data. */ 159 static Buffer stdout_buffer; /* Buffer for stdout data. */ 160 static Buffer stderr_buffer; /* Buffer for stderr data. */ 161 static u_int buffer_high; /* Soft max buffer size. */ 162 static int connection_in; /* Connection to server (input). */ 163 static int connection_out; /* Connection to server (output). */ 164 static int need_rekeying; /* Set to non-zero if rekeying is requested. */ 165 static int session_closed; /* In SSH2: login session closed. */ 166 static int x11_refuse_time; /* If >0, refuse x11 opens after this time. */ 167 168 static void client_init_dispatch(void); 169 int session_ident = -1; 170 171 int session_resumed = 0; 172 173 /* Track escape per proto2 channel */ 174 struct escape_filter_ctx { 175 int escape_pending; 176 int escape_char; 177 }; 178 179 /* Context for channel confirmation replies */ 180 struct channel_reply_ctx { 181 const char *request_type; 182 int id, do_close; 183 }; 184 185 /* Global request success/failure callbacks */ 186 struct global_confirm { 187 TAILQ_ENTRY(global_confirm) entry; 188 global_confirm_cb *cb; 189 void *ctx; 190 int ref_count; 191 }; 192 TAILQ_HEAD(global_confirms, global_confirm); 193 static struct global_confirms global_confirms = 194 TAILQ_HEAD_INITIALIZER(global_confirms); 195 196 /*XXX*/ 197 extern Kex *xxx_kex; 198 199 void ssh_process_session2_setup(int, int, int, Buffer *); 200 201 /* Restores stdin to blocking mode. */ 202 203 static void 204 leave_non_blocking(void) 205 { 206 if (in_non_blocking_mode) { 207 unset_nonblock(fileno(stdin)); 208 in_non_blocking_mode = 0; 209 } 210 } 211 212 /* Puts stdin terminal in non-blocking mode. */ 213 214 static void 215 enter_non_blocking(void) 216 { 217 in_non_blocking_mode = 1; 218 set_nonblock(fileno(stdin)); 219 } 220 221 /* 222 * Signal handler for the window change signal (SIGWINCH). This just sets a 223 * flag indicating that the window has changed. 224 */ 225 /*ARGSUSED */ 226 static void 227 window_change_handler(int sig) 228 { 229 received_window_change_signal = 1; 230 signal(SIGWINCH, window_change_handler); 231 } 232 233 /* 234 * Signal handler for signals that cause the program to terminate. These 235 * signals must be trapped to restore terminal modes. 236 */ 237 /*ARGSUSED */ 238 static void 239 signal_handler(int sig) 240 { 241 received_signal = sig; 242 quit_pending = 1; 243 } 244 245 /* 246 * Returns current time in seconds from Jan 1, 1970 with the maximum 247 * available resolution. 248 */ 249 250 static double 251 get_current_time(void) 252 { 253 struct timeval tv; 254 gettimeofday(&tv, NULL); 255 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; 256 } 257 258 /* 259 * Sets control_persist_exit_time to the absolute time when the 260 * backgrounded control master should exit due to expiry of the 261 * ControlPersist timeout. Sets it to 0 if we are not a backgrounded 262 * control master process, or if there is no ControlPersist timeout. 263 */ 264 static void 265 set_control_persist_exit_time(void) 266 { 267 if (muxserver_sock == -1 || !options.control_persist 268 || options.control_persist_timeout == 0) 269 /* not using a ControlPersist timeout */ 270 control_persist_exit_time = 0; 271 else if (channel_still_open()) { 272 /* some client connections are still open */ 273 if (control_persist_exit_time > 0) 274 debug2("%s: cancel scheduled exit", __func__); 275 control_persist_exit_time = 0; 276 } else if (control_persist_exit_time <= 0) { 277 /* a client connection has recently closed */ 278 control_persist_exit_time = time(NULL) + 279 (time_t)options.control_persist_timeout; 280 debug2("%s: schedule exit in %d seconds", __func__, 281 options.control_persist_timeout); 282 } 283 /* else we are already counting down to the timeout */ 284 } 285 286 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" 287 void 288 client_x11_get_proto(const char *display, const char *xauth_path, 289 u_int trusted, u_int timeout, char **_proto, char **_data) 290 { 291 char cmd[1024]; 292 char line[512]; 293 char xdisplay[512]; 294 static char proto[512], data[512]; 295 FILE *f; 296 int got_data = 0, generated = 0, do_unlink = 0, i; 297 char *xauthdir, *xauthfile; 298 struct stat st; 299 u_int now; 300 301 xauthdir = xauthfile = NULL; 302 *_proto = proto; 303 *_data = data; 304 proto[0] = data[0] = '\0'; 305 306 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { 307 debug("No xauth program."); 308 } else { 309 if (display == NULL) { 310 debug("x11_get_proto: DISPLAY not set"); 311 return; 312 } 313 /* 314 * Handle FamilyLocal case where $DISPLAY does 315 * not match an authorization entry. For this we 316 * just try "xauth list unix:displaynum.screennum". 317 * XXX: "localhost" match to determine FamilyLocal 318 * is not perfect. 319 */ 320 if (strncmp(display, "localhost:", 10) == 0) { 321 snprintf(xdisplay, sizeof(xdisplay), "unix:%s", 322 display + 10); 323 display = xdisplay; 324 } 325 if (trusted == 0) { 326 xauthdir = xmalloc(MAXPATHLEN); 327 xauthfile = xmalloc(MAXPATHLEN); 328 mktemp_proto(xauthdir, MAXPATHLEN); 329 if (mkdtemp(xauthdir) != NULL) { 330 do_unlink = 1; 331 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", 332 xauthdir); 333 snprintf(cmd, sizeof(cmd), 334 "%s -f %s generate %s " SSH_X11_PROTO 335 " untrusted timeout %u 2>" _PATH_DEVNULL, 336 xauth_path, xauthfile, display, timeout); 337 debug2("x11_get_proto: %s", cmd); 338 if (system(cmd) == 0) 339 generated = 1; 340 if (x11_refuse_time == 0) { 341 now = time(NULL) + 1; 342 if (UINT_MAX - timeout < now) 343 x11_refuse_time = UINT_MAX; 344 else 345 x11_refuse_time = now + timeout; 346 } 347 } 348 } 349 350 /* 351 * When in untrusted mode, we read the cookie only if it was 352 * successfully generated as an untrusted one in the step 353 * above. 354 */ 355 if (trusted || generated) { 356 snprintf(cmd, sizeof(cmd), 357 "%s %s%s list %s 2>" _PATH_DEVNULL, 358 xauth_path, 359 generated ? "-f " : "" , 360 generated ? xauthfile : "", 361 display); 362 debug2("x11_get_proto: %s", cmd); 363 f = popen(cmd, "r"); 364 if (f && fgets(line, sizeof(line), f) && 365 sscanf(line, "%*s %511s %511s", proto, data) == 2) 366 got_data = 1; 367 if (f) 368 pclose(f); 369 } else 370 error("Warning: untrusted X11 forwarding setup failed: " 371 "xauth key data not generated"); 372 } 373 374 if (do_unlink) { 375 unlink(xauthfile); 376 rmdir(xauthdir); 377 } 378 if (xauthdir) 379 xfree(xauthdir); 380 if (xauthfile) 381 xfree(xauthfile); 382 383 /* 384 * If we didn't get authentication data, just make up some 385 * data. The forwarding code will check the validity of the 386 * response anyway, and substitute this data. The X11 387 * server, however, will ignore this fake data and use 388 * whatever authentication mechanisms it was using otherwise 389 * for the local connection. 390 */ 391 if (!got_data) { 392 u_int32_t rnd = 0; 393 394 logit("Warning: No xauth data; " 395 "using fake authentication data for X11 forwarding."); 396 strlcpy(proto, SSH_X11_PROTO, sizeof proto); 397 for (i = 0; i < 16; i++) { 398 if (i % 4 == 0) 399 rnd = arc4random(); 400 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", 401 rnd & 0xff); 402 rnd >>= 8; 403 } 404 } 405 } 406 407 /* 408 * This is called when the interactive is entered. This checks if there is 409 * an EOF coming on stdin. We must check this explicitly, as select() does 410 * not appear to wake up when redirecting from /dev/null. 411 */ 412 413 static void 414 client_check_initial_eof_on_stdin(void) 415 { 416 int len; 417 char buf[1]; 418 419 /* 420 * If standard input is to be "redirected from /dev/null", we simply 421 * mark that we have seen an EOF and send an EOF message to the 422 * server. Otherwise, we try to read a single character; it appears 423 * that for some files, such /dev/null, select() never wakes up for 424 * read for this descriptor, which means that we never get EOF. This 425 * way we will get the EOF if stdin comes from /dev/null or similar. 426 */ 427 if (stdin_null_flag) { 428 /* Fake EOF on stdin. */ 429 debug("Sending eof."); 430 stdin_eof = 1; 431 packet_start(SSH_CMSG_EOF); 432 packet_send(); 433 } else { 434 enter_non_blocking(); 435 436 /* Check for immediate EOF on stdin. */ 437 len = read(fileno(stdin), buf, 1); 438 if (len == 0) { 439 /* 440 * EOF. Record that we have seen it and send 441 * EOF to server. 442 */ 443 debug("Sending eof."); 444 stdin_eof = 1; 445 packet_start(SSH_CMSG_EOF); 446 packet_send(); 447 } else if (len > 0) { 448 /* 449 * Got data. We must store the data in the buffer, 450 * and also process it as an escape character if 451 * appropriate. 452 */ 453 if ((u_char) buf[0] == escape_char1) 454 escape_pending1 = 1; 455 else 456 buffer_append(&stdin_buffer, buf, 1); 457 } 458 leave_non_blocking(); 459 } 460 } 461 462 463 /* 464 * Make packets from buffered stdin data, and buffer them for sending to the 465 * connection. 466 */ 467 468 static void 469 client_make_packets_from_stdin_data(void) 470 { 471 u_int len; 472 473 /* Send buffered stdin data to the server. */ 474 while (buffer_len(&stdin_buffer) > 0 && 475 packet_not_very_much_data_to_write()) { 476 len = buffer_len(&stdin_buffer); 477 /* Keep the packets at reasonable size. */ 478 if (len > packet_get_maxsize()) 479 len = packet_get_maxsize(); 480 packet_start(SSH_CMSG_STDIN_DATA); 481 packet_put_string(buffer_ptr(&stdin_buffer), len); 482 packet_send(); 483 buffer_consume(&stdin_buffer, len); 484 /* If we have a pending EOF, send it now. */ 485 if (stdin_eof && buffer_len(&stdin_buffer) == 0) { 486 packet_start(SSH_CMSG_EOF); 487 packet_send(); 488 } 489 } 490 } 491 492 /* 493 * Checks if the client window has changed, and sends a packet about it to 494 * the server if so. The actual change is detected elsewhere (by a software 495 * interrupt on Unix); this just checks the flag and sends a message if 496 * appropriate. 497 */ 498 499 static void 500 client_check_window_change(void) 501 { 502 struct winsize ws; 503 504 if (! received_window_change_signal) 505 return; 506 /** XXX race */ 507 received_window_change_signal = 0; 508 509 debug2("client_check_window_change: changed"); 510 511 if (compat20) { 512 channel_send_window_changes(); 513 } else { 514 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) 515 return; 516 packet_start(SSH_CMSG_WINDOW_SIZE); 517 packet_put_int((u_int)ws.ws_row); 518 packet_put_int((u_int)ws.ws_col); 519 packet_put_int((u_int)ws.ws_xpixel); 520 packet_put_int((u_int)ws.ws_ypixel); 521 packet_send(); 522 } 523 } 524 525 static void 526 client_global_request_reply(int type, u_int32_t seq, void *ctxt) 527 { 528 struct global_confirm *gc; 529 530 if ((gc = TAILQ_FIRST(&global_confirms)) == NULL) 531 return; 532 if (gc->cb != NULL) 533 gc->cb(type, seq, gc->ctx); 534 if (--gc->ref_count <= 0) { 535 TAILQ_REMOVE(&global_confirms, gc, entry); 536 bzero(gc, sizeof(*gc)); 537 xfree(gc); 538 } 539 540 packet_set_alive_timeouts(0); 541 } 542 543 static void 544 server_alive_check(void) 545 { 546 if (packet_inc_alive_timeouts() > options.server_alive_count_max) { 547 logit("Timeout, server %s not responding.", host); 548 cleanup_exit(255); 549 } 550 packet_start(SSH2_MSG_GLOBAL_REQUEST); 551 packet_put_cstring("keepalive@openssh.com"); 552 packet_put_char(1); /* boolean: want reply */ 553 packet_send(); 554 /* Insert an empty placeholder to maintain ordering */ 555 client_register_global_confirm(NULL, NULL); 556 } 557 558 /* 559 * Waits until the client can do something (some data becomes available on 560 * one of the file descriptors). 561 */ 562 static void 563 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, 564 int *maxfdp, u_int *nallocp, int rekeying) 565 { 566 struct timeval tv, *tvp; 567 int timeout_secs; 568 int ret; 569 570 /* Add any selections by the channel mechanism. */ 571 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); 572 573 if (!compat20) { 574 /* Read from the connection, unless our buffers are full. */ 575 if (buffer_len(&stdout_buffer) < buffer_high && 576 buffer_len(&stderr_buffer) < buffer_high && 577 channel_not_very_much_buffered_data()) 578 FD_SET(connection_in, *readsetp); 579 /* 580 * Read from stdin, unless we have seen EOF or have very much 581 * buffered data to send to the server. 582 */ 583 if (!stdin_eof && packet_not_very_much_data_to_write()) 584 FD_SET(fileno(stdin), *readsetp); 585 586 /* Select stdout/stderr if have data in buffer. */ 587 if (buffer_len(&stdout_buffer) > 0) 588 FD_SET(fileno(stdout), *writesetp); 589 if (buffer_len(&stderr_buffer) > 0) 590 FD_SET(fileno(stderr), *writesetp); 591 } else { 592 /* channel_prepare_select could have closed the last channel */ 593 if (session_closed && !channel_still_open() && 594 !packet_have_data_to_write()) { 595 /* clear mask since we did not call select() */ 596 memset(*readsetp, 0, *nallocp); 597 memset(*writesetp, 0, *nallocp); 598 return; 599 } else { 600 FD_SET(connection_in, *readsetp); 601 } 602 } 603 604 /* Select server connection if have data to write to the server. */ 605 if (packet_have_data_to_write()) 606 FD_SET(connection_out, *writesetp); 607 608 /* 609 * Wait for something to happen. This will suspend the process until 610 * some selected descriptor can be read, written, or has some other 611 * event pending, or a timeout expires. 612 */ 613 614 timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */ 615 if (options.server_alive_interval > 0 && compat20) 616 timeout_secs = options.server_alive_interval; 617 set_control_persist_exit_time(); 618 if (control_persist_exit_time > 0) { 619 timeout_secs = MIN(timeout_secs, 620 control_persist_exit_time - time(NULL)); 621 if (timeout_secs < 0) 622 timeout_secs = 0; 623 } 624 if (timeout_secs == INT_MAX) 625 tvp = NULL; 626 else { 627 tv.tv_sec = timeout_secs; 628 tv.tv_usec = 0; 629 tvp = &tv; 630 } 631 632 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); 633 if (ret < 0) { 634 char buf[100]; 635 636 /* 637 * We have to clear the select masks, because we return. 638 * We have to return, because the mainloop checks for the flags 639 * set by the signal handlers. 640 */ 641 memset(*readsetp, 0, *nallocp); 642 memset(*writesetp, 0, *nallocp); 643 644 if (errno == EINTR) 645 return; 646 /* Note: we might still have data in the buffers. */ 647 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); 648 buffer_append(&stderr_buffer, buf, strlen(buf)); 649 quit_pending = 1; 650 } else if (ret == 0) 651 server_alive_check(); 652 } 653 654 static void 655 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) 656 { 657 /* Flush stdout and stderr buffers. */ 658 if (buffer_len(bout) > 0) 659 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), 660 buffer_len(bout)); 661 if (buffer_len(berr) > 0) 662 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), 663 buffer_len(berr)); 664 665 leave_raw_mode(force_tty_flag); 666 667 /* 668 * Free (and clear) the buffer to reduce the amount of data that gets 669 * written to swap. 670 */ 671 buffer_free(bin); 672 buffer_free(bout); 673 buffer_free(berr); 674 675 /* Send the suspend signal to the program itself. */ 676 kill(getpid(), SIGTSTP); 677 678 /* Reset window sizes in case they have changed */ 679 received_window_change_signal = 1; 680 681 /* OK, we have been continued by the user. Reinitialize buffers. */ 682 buffer_init(bin); 683 buffer_init(bout); 684 buffer_init(berr); 685 686 enter_raw_mode(force_tty_flag); 687 } 688 689 static void 690 client_process_net_input(fd_set *readset) 691 { 692 int len, cont = 0; 693 char buf[SSH_IOBUFSZ]; 694 695 /* 696 * Read input from the server, and add any such data to the buffer of 697 * the packet subsystem. 698 */ 699 if (FD_ISSET(connection_in, readset)) { 700 /* Read as much as possible. */ 701 len = roaming_read(connection_in, buf, sizeof(buf), &cont); 702 if (len == 0 && cont == 0) { 703 /* 704 * Received EOF. The remote host has closed the 705 * connection. 706 */ 707 snprintf(buf, sizeof buf, 708 "Connection to %.300s closed by remote host.\r\n", 709 host); 710 buffer_append(&stderr_buffer, buf, strlen(buf)); 711 quit_pending = 1; 712 return; 713 } 714 /* 715 * There is a kernel bug on Solaris that causes select to 716 * sometimes wake up even though there is no data available. 717 */ 718 if (len < 0 && 719 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) 720 len = 0; 721 722 if (len < 0) { 723 /* 724 * An error has encountered. Perhaps there is a 725 * network problem. 726 */ 727 snprintf(buf, sizeof buf, 728 "Read from remote host %.300s: %.100s\r\n", 729 host, strerror(errno)); 730 buffer_append(&stderr_buffer, buf, strlen(buf)); 731 quit_pending = 1; 732 return; 733 } 734 packet_process_incoming(buf, len); 735 } 736 } 737 738 static void 739 client_status_confirm(int type, Channel *c, void *ctx) 740 { 741 struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx; 742 char errmsg[256]; 743 int tochan; 744 745 /* XXX supress on mux _client_ quietmode */ 746 tochan = options.log_level >= SYSLOG_LEVEL_ERROR && 747 c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE; 748 749 if (type == SSH2_MSG_CHANNEL_SUCCESS) { 750 debug2("%s request accepted on channel %d", 751 cr->request_type, c->self); 752 } else if (type == SSH2_MSG_CHANNEL_FAILURE) { 753 if (tochan) { 754 snprintf(errmsg, sizeof(errmsg), 755 "%s request failed\r\n", cr->request_type); 756 } else { 757 snprintf(errmsg, sizeof(errmsg), 758 "%s request failed on channel %d", 759 cr->request_type, c->self); 760 } 761 /* If error occurred on primary session channel, then exit */ 762 if (cr->do_close && c->self == session_ident) 763 fatal("%s", errmsg); 764 /* If error occurred on mux client, append to their stderr */ 765 if (tochan) 766 buffer_append(&c->extended, errmsg, strlen(errmsg)); 767 else 768 error("%s", errmsg); 769 if (cr->do_close) { 770 chan_read_failed(c); 771 chan_write_failed(c); 772 } 773 } 774 xfree(cr); 775 } 776 777 static void 778 client_abandon_status_confirm(Channel *c, void *ctx) 779 { 780 xfree(ctx); 781 } 782 783 static void 784 client_expect_confirm(int id, const char *request, int do_close) 785 { 786 struct channel_reply_ctx *cr = xmalloc(sizeof(*cr)); 787 788 cr->request_type = request; 789 cr->do_close = do_close; 790 791 channel_register_status_confirm(id, client_status_confirm, 792 client_abandon_status_confirm, cr); 793 } 794 795 void 796 client_register_global_confirm(global_confirm_cb *cb, void *ctx) 797 { 798 struct global_confirm *gc, *last_gc; 799 800 /* Coalesce identical callbacks */ 801 last_gc = TAILQ_LAST(&global_confirms, global_confirms); 802 if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) { 803 if (++last_gc->ref_count >= INT_MAX) 804 fatal("%s: last_gc->ref_count = %d", 805 __func__, last_gc->ref_count); 806 return; 807 } 808 809 gc = xmalloc(sizeof(*gc)); 810 gc->cb = cb; 811 gc->ctx = ctx; 812 gc->ref_count = 1; 813 TAILQ_INSERT_TAIL(&global_confirms, gc, entry); 814 } 815 816 static void 817 process_cmdline(void) 818 { 819 void (*handler)(int); 820 char *s, *cmd, *cancel_host; 821 int delete = 0; 822 int local = 0, remote = 0, dynamic = 0; 823 int cancel_port; 824 Forward fwd; 825 826 bzero(&fwd, sizeof(fwd)); 827 fwd.listen_host = fwd.connect_host = NULL; 828 829 leave_raw_mode(force_tty_flag); 830 handler = signal(SIGINT, SIG_IGN); 831 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); 832 if (s == NULL) 833 goto out; 834 while (isspace(*s)) 835 s++; 836 if (*s == '-') 837 s++; /* Skip cmdline '-', if any */ 838 if (*s == '\0') 839 goto out; 840 841 if (*s == 'h' || *s == 'H' || *s == '?') { 842 logit("Commands:"); 843 logit(" -L[bind_address:]port:host:hostport " 844 "Request local forward"); 845 logit(" -R[bind_address:]port:host:hostport " 846 "Request remote forward"); 847 logit(" -D[bind_address:]port " 848 "Request dynamic forward"); 849 logit(" -KR[bind_address:]port " 850 "Cancel remote forward"); 851 if (!options.permit_local_command) 852 goto out; 853 logit(" !args " 854 "Execute local command"); 855 goto out; 856 } 857 858 if (*s == '!' && options.permit_local_command) { 859 s++; 860 ssh_local_cmd(s); 861 goto out; 862 } 863 864 if (*s == 'K') { 865 delete = 1; 866 s++; 867 } 868 if (*s == 'L') 869 local = 1; 870 else if (*s == 'R') 871 remote = 1; 872 else if (*s == 'D') 873 dynamic = 1; 874 else { 875 logit("Invalid command."); 876 goto out; 877 } 878 879 if ((local || dynamic) && delete) { 880 logit("Not supported."); 881 goto out; 882 } 883 if (remote && delete && !compat20) { 884 logit("Not supported for SSH protocol version 1."); 885 goto out; 886 } 887 888 while (isspace(*++s)) 889 ; 890 891 /* XXX update list of forwards in options */ 892 if (delete) { 893 cancel_port = 0; 894 cancel_host = hpdelim(&s); /* may be NULL */ 895 if (s != NULL) { 896 cancel_port = a2port(s); 897 cancel_host = cleanhostname(cancel_host); 898 } else { 899 cancel_port = a2port(cancel_host); 900 cancel_host = NULL; 901 } 902 if (cancel_port <= 0) { 903 logit("Bad forwarding close port"); 904 goto out; 905 } 906 channel_request_rforward_cancel(cancel_host, cancel_port); 907 } else { 908 if (!parse_forward(&fwd, s, dynamic, remote)) { 909 logit("Bad forwarding specification."); 910 goto out; 911 } 912 if (local || dynamic) { 913 if (channel_setup_local_fwd_listener(fwd.listen_host, 914 fwd.listen_port, fwd.connect_host, 915 fwd.connect_port, options.gateway_ports) < 0) { 916 logit("Port forwarding failed."); 917 goto out; 918 } 919 } else { 920 if (channel_request_remote_forwarding(fwd.listen_host, 921 fwd.listen_port, fwd.connect_host, 922 fwd.connect_port) < 0) { 923 logit("Port forwarding failed."); 924 goto out; 925 } 926 } 927 928 logit("Forwarding port."); 929 } 930 931 out: 932 signal(SIGINT, handler); 933 enter_raw_mode(force_tty_flag); 934 if (cmd) 935 xfree(cmd); 936 if (fwd.listen_host != NULL) 937 xfree(fwd.listen_host); 938 if (fwd.connect_host != NULL) 939 xfree(fwd.connect_host); 940 } 941 942 /* 943 * Process the characters one by one, call with c==NULL for proto1 case. 944 */ 945 static int 946 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr, 947 char *buf, int len) 948 { 949 char string[1024]; 950 pid_t pid; 951 int bytes = 0; 952 u_int i; 953 u_char ch; 954 char *s; 955 int *escape_pendingp, escape_char; 956 struct escape_filter_ctx *efc; 957 958 if (c == NULL) { 959 escape_pendingp = &escape_pending1; 960 escape_char = escape_char1; 961 } else { 962 if (c->filter_ctx == NULL) 963 return 0; 964 efc = (struct escape_filter_ctx *)c->filter_ctx; 965 escape_pendingp = &efc->escape_pending; 966 escape_char = efc->escape_char; 967 } 968 969 if (len <= 0) 970 return (0); 971 972 for (i = 0; i < (u_int)len; i++) { 973 /* Get one character at a time. */ 974 ch = buf[i]; 975 976 if (*escape_pendingp) { 977 /* We have previously seen an escape character. */ 978 /* Clear the flag now. */ 979 *escape_pendingp = 0; 980 981 /* Process the escaped character. */ 982 switch (ch) { 983 case '.': 984 /* Terminate the connection. */ 985 snprintf(string, sizeof string, "%c.\r\n", 986 escape_char); 987 buffer_append(berr, string, strlen(string)); 988 989 if (c && c->ctl_chan != -1) { 990 chan_read_failed(c); 991 chan_write_failed(c); 992 return 0; 993 } else 994 quit_pending = 1; 995 return -1; 996 997 case 'Z' - 64: 998 /* XXX support this for mux clients */ 999 if (c && c->ctl_chan != -1) { 1000 noescape: 1001 snprintf(string, sizeof string, 1002 "%c%c escape not available to " 1003 "multiplexed sessions\r\n", 1004 escape_char, ch); 1005 buffer_append(berr, string, 1006 strlen(string)); 1007 continue; 1008 } 1009 /* Suspend the program. Inform the user */ 1010 snprintf(string, sizeof string, 1011 "%c^Z [suspend ssh]\r\n", escape_char); 1012 buffer_append(berr, string, strlen(string)); 1013 1014 /* Restore terminal modes and suspend. */ 1015 client_suspend_self(bin, bout, berr); 1016 1017 /* We have been continued. */ 1018 continue; 1019 1020 case 'B': 1021 if (compat20) { 1022 snprintf(string, sizeof string, 1023 "%cB\r\n", escape_char); 1024 buffer_append(berr, string, 1025 strlen(string)); 1026 channel_request_start(session_ident, 1027 "break", 0); 1028 packet_put_int(1000); 1029 packet_send(); 1030 } 1031 continue; 1032 1033 case 'R': 1034 if (compat20) { 1035 if (datafellows & SSH_BUG_NOREKEY) 1036 logit("Server does not " 1037 "support re-keying"); 1038 else 1039 need_rekeying = 1; 1040 } 1041 continue; 1042 1043 case '&': 1044 if (c && c->ctl_chan != -1) 1045 goto noescape; 1046 /* 1047 * Detach the program (continue to serve 1048 * connections, but put in background and no 1049 * more new connections). 1050 */ 1051 /* Restore tty modes. */ 1052 leave_raw_mode(force_tty_flag); 1053 1054 /* Stop listening for new connections. */ 1055 channel_stop_listening(); 1056 1057 snprintf(string, sizeof string, 1058 "%c& [backgrounded]\n", escape_char); 1059 buffer_append(berr, string, strlen(string)); 1060 1061 /* Fork into background. */ 1062 pid = fork(); 1063 if (pid < 0) { 1064 error("fork: %.100s", strerror(errno)); 1065 continue; 1066 } 1067 if (pid != 0) { /* This is the parent. */ 1068 /* The parent just exits. */ 1069 exit(0); 1070 } 1071 /* The child continues serving connections. */ 1072 if (compat20) { 1073 buffer_append(bin, "\004", 1); 1074 /* fake EOF on stdin */ 1075 return -1; 1076 } else if (!stdin_eof) { 1077 /* 1078 * Sending SSH_CMSG_EOF alone does not 1079 * always appear to be enough. So we 1080 * try to send an EOF character first. 1081 */ 1082 packet_start(SSH_CMSG_STDIN_DATA); 1083 packet_put_string("\004", 1); 1084 packet_send(); 1085 /* Close stdin. */ 1086 stdin_eof = 1; 1087 if (buffer_len(bin) == 0) { 1088 packet_start(SSH_CMSG_EOF); 1089 packet_send(); 1090 } 1091 } 1092 continue; 1093 1094 case '?': 1095 if (c && c->ctl_chan != -1) { 1096 snprintf(string, sizeof string, 1097 "%c?\r\n\ 1098 Supported escape sequences:\r\n\ 1099 %c. - terminate session\r\n\ 1100 %cB - send a BREAK to the remote system\r\n\ 1101 %cR - Request rekey (SSH protocol 2 only)\r\n\ 1102 %c# - list forwarded connections\r\n\ 1103 %c? - this message\r\n\ 1104 %c%c - send the escape character by typing it twice\r\n\ 1105 (Note that escapes are only recognized immediately after newline.)\r\n", 1106 escape_char, escape_char, 1107 escape_char, escape_char, 1108 escape_char, escape_char, 1109 escape_char, escape_char); 1110 } else { 1111 snprintf(string, sizeof string, 1112 "%c?\r\n\ 1113 Supported escape sequences:\r\n\ 1114 %c. - terminate connection (and any multiplexed sessions)\r\n\ 1115 %cB - send a BREAK to the remote system\r\n\ 1116 %cC - open a command line\r\n\ 1117 %cR - Request rekey (SSH protocol 2 only)\r\n\ 1118 %c^Z - suspend ssh\r\n\ 1119 %c# - list forwarded connections\r\n\ 1120 %c& - background ssh (when waiting for connections to terminate)\r\n\ 1121 %c? - this message\r\n\ 1122 %c%c - send the escape character by typing it twice\r\n\ 1123 (Note that escapes are only recognized immediately after newline.)\r\n", 1124 escape_char, escape_char, 1125 escape_char, escape_char, 1126 escape_char, escape_char, 1127 escape_char, escape_char, 1128 escape_char, escape_char, 1129 escape_char); 1130 } 1131 buffer_append(berr, string, strlen(string)); 1132 continue; 1133 1134 case '#': 1135 snprintf(string, sizeof string, "%c#\r\n", 1136 escape_char); 1137 buffer_append(berr, string, strlen(string)); 1138 s = channel_open_message(); 1139 buffer_append(berr, s, strlen(s)); 1140 xfree(s); 1141 continue; 1142 1143 case 'C': 1144 if (c && c->ctl_chan != -1) 1145 goto noescape; 1146 process_cmdline(); 1147 continue; 1148 1149 default: 1150 if (ch != escape_char) { 1151 buffer_put_char(bin, escape_char); 1152 bytes++; 1153 } 1154 /* Escaped characters fall through here */ 1155 break; 1156 } 1157 } else { 1158 /* 1159 * The previous character was not an escape char. 1160 * Check if this is an escape. 1161 */ 1162 if (last_was_cr && ch == escape_char) { 1163 /* 1164 * It is. Set the flag and continue to 1165 * next character. 1166 */ 1167 *escape_pendingp = 1; 1168 continue; 1169 } 1170 } 1171 1172 /* 1173 * Normal character. Record whether it was a newline, 1174 * and append it to the buffer. 1175 */ 1176 last_was_cr = (ch == '\r' || ch == '\n'); 1177 buffer_put_char(bin, ch); 1178 bytes++; 1179 } 1180 return bytes; 1181 } 1182 1183 static void 1184 client_process_input(fd_set *readset) 1185 { 1186 int len; 1187 char buf[SSH_IOBUFSZ]; 1188 1189 /* Read input from stdin. */ 1190 if (FD_ISSET(fileno(stdin), readset)) { 1191 /* Read as much as possible. */ 1192 len = read(fileno(stdin), buf, sizeof(buf)); 1193 if (len < 0 && 1194 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) 1195 return; /* we'll try again later */ 1196 if (len <= 0) { 1197 /* 1198 * Received EOF or error. They are treated 1199 * similarly, except that an error message is printed 1200 * if it was an error condition. 1201 */ 1202 if (len < 0) { 1203 snprintf(buf, sizeof buf, "read: %.100s\r\n", 1204 strerror(errno)); 1205 buffer_append(&stderr_buffer, buf, strlen(buf)); 1206 } 1207 /* Mark that we have seen EOF. */ 1208 stdin_eof = 1; 1209 /* 1210 * Send an EOF message to the server unless there is 1211 * data in the buffer. If there is data in the 1212 * buffer, no message will be sent now. Code 1213 * elsewhere will send the EOF when the buffer 1214 * becomes empty if stdin_eof is set. 1215 */ 1216 if (buffer_len(&stdin_buffer) == 0) { 1217 packet_start(SSH_CMSG_EOF); 1218 packet_send(); 1219 } 1220 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) { 1221 /* 1222 * Normal successful read, and no escape character. 1223 * Just append the data to buffer. 1224 */ 1225 buffer_append(&stdin_buffer, buf, len); 1226 } else { 1227 /* 1228 * Normal, successful read. But we have an escape 1229 * character and have to process the characters one 1230 * by one. 1231 */ 1232 if (process_escapes(NULL, &stdin_buffer, 1233 &stdout_buffer, &stderr_buffer, buf, len) == -1) 1234 return; 1235 } 1236 } 1237 } 1238 1239 static void 1240 client_process_output(fd_set *writeset) 1241 { 1242 int len; 1243 char buf[100]; 1244 1245 /* Write buffered output to stdout. */ 1246 if (FD_ISSET(fileno(stdout), writeset)) { 1247 /* Write as much data as possible. */ 1248 len = write(fileno(stdout), buffer_ptr(&stdout_buffer), 1249 buffer_len(&stdout_buffer)); 1250 if (len <= 0) { 1251 if (errno == EINTR || errno == EAGAIN || 1252 errno == EWOULDBLOCK) 1253 len = 0; 1254 else { 1255 /* 1256 * An error or EOF was encountered. Put an 1257 * error message to stderr buffer. 1258 */ 1259 snprintf(buf, sizeof buf, 1260 "write stdout: %.50s\r\n", strerror(errno)); 1261 buffer_append(&stderr_buffer, buf, strlen(buf)); 1262 quit_pending = 1; 1263 return; 1264 } 1265 } 1266 /* Consume printed data from the buffer. */ 1267 buffer_consume(&stdout_buffer, len); 1268 } 1269 /* Write buffered output to stderr. */ 1270 if (FD_ISSET(fileno(stderr), writeset)) { 1271 /* Write as much data as possible. */ 1272 len = write(fileno(stderr), buffer_ptr(&stderr_buffer), 1273 buffer_len(&stderr_buffer)); 1274 if (len <= 0) { 1275 if (errno == EINTR || errno == EAGAIN || 1276 errno == EWOULDBLOCK) 1277 len = 0; 1278 else { 1279 /* 1280 * EOF or error, but can't even print 1281 * error message. 1282 */ 1283 quit_pending = 1; 1284 return; 1285 } 1286 } 1287 /* Consume printed characters from the buffer. */ 1288 buffer_consume(&stderr_buffer, len); 1289 } 1290 } 1291 1292 /* 1293 * Get packets from the connection input buffer, and process them as long as 1294 * there are packets available. 1295 * 1296 * Any unknown packets received during the actual 1297 * session cause the session to terminate. This is 1298 * intended to make debugging easier since no 1299 * confirmations are sent. Any compatible protocol 1300 * extensions must be negotiated during the 1301 * preparatory phase. 1302 */ 1303 1304 static void 1305 client_process_buffered_input_packets(void) 1306 { 1307 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, 1308 compat20 ? xxx_kex : NULL); 1309 } 1310 1311 /* scan buf[] for '~' before sending data to the peer */ 1312 1313 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */ 1314 void * 1315 client_new_escape_filter_ctx(int escape_char) 1316 { 1317 struct escape_filter_ctx *ret; 1318 1319 ret = xmalloc(sizeof(*ret)); 1320 ret->escape_pending = 0; 1321 ret->escape_char = escape_char; 1322 return (void *)ret; 1323 } 1324 1325 /* Free the escape filter context on channel free */ 1326 void 1327 client_filter_cleanup(int cid, void *ctx) 1328 { 1329 xfree(ctx); 1330 } 1331 1332 int 1333 client_simple_escape_filter(Channel *c, char *buf, int len) 1334 { 1335 if (c->extended_usage != CHAN_EXTENDED_WRITE) 1336 return 0; 1337 1338 return process_escapes(c, &c->input, &c->output, &c->extended, 1339 buf, len); 1340 } 1341 1342 static void 1343 client_channel_closed(int id, void *arg) 1344 { 1345 channel_cancel_cleanup(id); 1346 session_closed = 1; 1347 leave_raw_mode(force_tty_flag); 1348 } 1349 1350 /* 1351 * Implements the interactive session with the server. This is called after 1352 * the user has been authenticated, and a command has been started on the 1353 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character 1354 * used as an escape character for terminating or suspending the session. 1355 */ 1356 1357 int 1358 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) 1359 { 1360 fd_set *readset = NULL, *writeset = NULL; 1361 double start_time, total_time; 1362 int max_fd = 0, max_fd2 = 0, len, rekeying = 0; 1363 u_int64_t ibytes, obytes; 1364 u_int nalloc = 0; 1365 char buf[100]; 1366 1367 debug("Entering interactive session."); 1368 1369 start_time = get_current_time(); 1370 1371 /* Initialize variables. */ 1372 escape_pending1 = 0; 1373 last_was_cr = 1; 1374 exit_status = -1; 1375 stdin_eof = 0; 1376 buffer_high = 64 * 1024; 1377 connection_in = packet_get_connection_in(); 1378 connection_out = packet_get_connection_out(); 1379 max_fd = MAX(connection_in, connection_out); 1380 1381 if (!compat20) { 1382 /* enable nonblocking unless tty */ 1383 if (!isatty(fileno(stdin))) 1384 set_nonblock(fileno(stdin)); 1385 if (!isatty(fileno(stdout))) 1386 set_nonblock(fileno(stdout)); 1387 if (!isatty(fileno(stderr))) 1388 set_nonblock(fileno(stderr)); 1389 max_fd = MAX(max_fd, fileno(stdin)); 1390 max_fd = MAX(max_fd, fileno(stdout)); 1391 max_fd = MAX(max_fd, fileno(stderr)); 1392 } 1393 quit_pending = 0; 1394 escape_char1 = escape_char_arg; 1395 1396 /* Initialize buffers. */ 1397 buffer_init(&stdin_buffer); 1398 buffer_init(&stdout_buffer); 1399 buffer_init(&stderr_buffer); 1400 1401 client_init_dispatch(); 1402 1403 /* 1404 * Set signal handlers, (e.g. to restore non-blocking mode) 1405 * but don't overwrite SIG_IGN, matches behaviour from rsh(1) 1406 */ 1407 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) 1408 signal(SIGHUP, signal_handler); 1409 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 1410 signal(SIGINT, signal_handler); 1411 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) 1412 signal(SIGQUIT, signal_handler); 1413 if (signal(SIGTERM, SIG_IGN) != SIG_IGN) 1414 signal(SIGTERM, signal_handler); 1415 signal(SIGWINCH, window_change_handler); 1416 1417 if (have_pty) 1418 enter_raw_mode(force_tty_flag); 1419 1420 if (compat20) { 1421 session_ident = ssh2_chan_id; 1422 if (escape_char_arg != SSH_ESCAPECHAR_NONE) 1423 channel_register_filter(session_ident, 1424 client_simple_escape_filter, NULL, 1425 client_filter_cleanup, 1426 client_new_escape_filter_ctx(escape_char_arg)); 1427 if (session_ident != -1) 1428 channel_register_cleanup(session_ident, 1429 client_channel_closed, 0); 1430 } else { 1431 /* Check if we should immediately send eof on stdin. */ 1432 client_check_initial_eof_on_stdin(); 1433 } 1434 1435 /* Main loop of the client for the interactive session mode. */ 1436 while (!quit_pending) { 1437 1438 /* Process buffered packets sent by the server. */ 1439 client_process_buffered_input_packets(); 1440 1441 if (compat20 && session_closed && !channel_still_open()) 1442 break; 1443 1444 rekeying = (xxx_kex != NULL && !xxx_kex->done); 1445 1446 if (rekeying) { 1447 debug("rekeying in progress"); 1448 } else { 1449 /* 1450 * Make packets of buffered stdin data, and buffer 1451 * them for sending to the server. 1452 */ 1453 if (!compat20) 1454 client_make_packets_from_stdin_data(); 1455 1456 /* 1457 * Make packets from buffered channel data, and 1458 * enqueue them for sending to the server. 1459 */ 1460 if (packet_not_very_much_data_to_write()) 1461 channel_output_poll(); 1462 1463 /* 1464 * Check if the window size has changed, and buffer a 1465 * message about it to the server if so. 1466 */ 1467 client_check_window_change(); 1468 1469 if (quit_pending) 1470 break; 1471 } 1472 /* 1473 * Wait until we have something to do (something becomes 1474 * available on one of the descriptors). 1475 */ 1476 max_fd2 = max_fd; 1477 client_wait_until_can_do_something(&readset, &writeset, 1478 &max_fd2, &nalloc, rekeying); 1479 1480 if (quit_pending) 1481 break; 1482 1483 /* Do channel operations unless rekeying in progress. */ 1484 if (!rekeying) { 1485 channel_after_select(readset, writeset); 1486 if (need_rekeying || packet_need_rekeying()) { 1487 debug("need rekeying"); 1488 xxx_kex->done = 0; 1489 kex_send_kexinit(xxx_kex); 1490 need_rekeying = 0; 1491 } 1492 } 1493 1494 /* Buffer input from the connection. */ 1495 client_process_net_input(readset); 1496 1497 if (quit_pending) 1498 break; 1499 1500 if (!compat20) { 1501 /* Buffer data from stdin */ 1502 client_process_input(readset); 1503 /* 1504 * Process output to stdout and stderr. Output to 1505 * the connection is processed elsewhere (above). 1506 */ 1507 client_process_output(writeset); 1508 } 1509 1510 if (session_resumed) { 1511 connection_in = packet_get_connection_in(); 1512 connection_out = packet_get_connection_out(); 1513 max_fd = MAX(max_fd, connection_out); 1514 max_fd = MAX(max_fd, connection_in); 1515 session_resumed = 0; 1516 } 1517 1518 /* 1519 * Send as much buffered packet data as possible to the 1520 * sender. 1521 */ 1522 if (FD_ISSET(connection_out, writeset)) 1523 packet_write_poll(); 1524 1525 /* 1526 * If we are a backgrounded control master, and the 1527 * timeout has expired without any active client 1528 * connections, then quit. 1529 */ 1530 if (control_persist_exit_time > 0) { 1531 if (time(NULL) >= control_persist_exit_time) { 1532 debug("ControlPersist timeout expired"); 1533 break; 1534 } 1535 } 1536 } 1537 if (readset) 1538 xfree(readset); 1539 if (writeset) 1540 xfree(writeset); 1541 1542 /* Terminate the session. */ 1543 1544 /* Stop watching for window change. */ 1545 signal(SIGWINCH, SIG_DFL); 1546 1547 if (compat20) { 1548 packet_start(SSH2_MSG_DISCONNECT); 1549 packet_put_int(SSH2_DISCONNECT_BY_APPLICATION); 1550 packet_put_cstring("disconnected by user"); 1551 packet_put_cstring(""); /* language tag */ 1552 packet_send(); 1553 packet_write_wait(); 1554 } 1555 1556 channel_free_all(); 1557 1558 if (have_pty) 1559 leave_raw_mode(force_tty_flag); 1560 1561 /* restore blocking io */ 1562 if (!isatty(fileno(stdin))) 1563 unset_nonblock(fileno(stdin)); 1564 if (!isatty(fileno(stdout))) 1565 unset_nonblock(fileno(stdout)); 1566 if (!isatty(fileno(stderr))) 1567 unset_nonblock(fileno(stderr)); 1568 1569 /* 1570 * If there was no shell or command requested, there will be no remote 1571 * exit status to be returned. In that case, clear error code if the 1572 * connection was deliberately terminated at this end. 1573 */ 1574 if (no_shell_flag && received_signal == SIGTERM) { 1575 received_signal = 0; 1576 exit_status = 0; 1577 } 1578 1579 if (received_signal) 1580 fatal("Killed by signal %d.", (int) received_signal); 1581 1582 /* 1583 * In interactive mode (with pseudo tty) display a message indicating 1584 * that the connection has been closed. 1585 */ 1586 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { 1587 snprintf(buf, sizeof buf, 1588 "Connection to %.64s closed.\r\n", host); 1589 buffer_append(&stderr_buffer, buf, strlen(buf)); 1590 } 1591 1592 /* Output any buffered data for stdout. */ 1593 if (buffer_len(&stdout_buffer) > 0) { 1594 len = atomicio(vwrite, fileno(stdout), 1595 buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer)); 1596 if (len < 0 || (u_int)len != buffer_len(&stdout_buffer)) 1597 error("Write failed flushing stdout buffer."); 1598 else 1599 buffer_consume(&stdout_buffer, len); 1600 } 1601 1602 /* Output any buffered data for stderr. */ 1603 if (buffer_len(&stderr_buffer) > 0) { 1604 len = atomicio(vwrite, fileno(stderr), 1605 buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer)); 1606 if (len < 0 || (u_int)len != buffer_len(&stderr_buffer)) 1607 error("Write failed flushing stderr buffer."); 1608 else 1609 buffer_consume(&stderr_buffer, len); 1610 } 1611 1612 /* Clear and free any buffers. */ 1613 memset(buf, 0, sizeof(buf)); 1614 buffer_free(&stdin_buffer); 1615 buffer_free(&stdout_buffer); 1616 buffer_free(&stderr_buffer); 1617 1618 /* Report bytes transferred, and transfer rates. */ 1619 total_time = get_current_time() - start_time; 1620 packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes); 1621 packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes); 1622 verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds", 1623 (unsigned long long)obytes, (unsigned long long)ibytes, total_time); 1624 if (total_time > 0) 1625 verbose("Bytes per second: sent %.1f, received %.1f", 1626 obytes / total_time, ibytes / total_time); 1627 /* Return the exit status of the program. */ 1628 debug("Exit status %d", exit_status); 1629 return exit_status; 1630 } 1631 1632 /*********/ 1633 1634 static void 1635 client_input_stdout_data(int type, u_int32_t seq, void *ctxt) 1636 { 1637 u_int data_len; 1638 char *data = packet_get_string(&data_len); 1639 packet_check_eom(); 1640 buffer_append(&stdout_buffer, data, data_len); 1641 memset(data, 0, data_len); 1642 xfree(data); 1643 } 1644 static void 1645 client_input_stderr_data(int type, u_int32_t seq, void *ctxt) 1646 { 1647 u_int data_len; 1648 char *data = packet_get_string(&data_len); 1649 packet_check_eom(); 1650 buffer_append(&stderr_buffer, data, data_len); 1651 memset(data, 0, data_len); 1652 xfree(data); 1653 } 1654 static void 1655 client_input_exit_status(int type, u_int32_t seq, void *ctxt) 1656 { 1657 exit_status = packet_get_int(); 1658 packet_check_eom(); 1659 /* Acknowledge the exit. */ 1660 packet_start(SSH_CMSG_EXIT_CONFIRMATION); 1661 packet_send(); 1662 /* 1663 * Must wait for packet to be sent since we are 1664 * exiting the loop. 1665 */ 1666 packet_write_wait(); 1667 /* Flag that we want to exit. */ 1668 quit_pending = 1; 1669 } 1670 static void 1671 client_input_agent_open(int type, u_int32_t seq, void *ctxt) 1672 { 1673 Channel *c = NULL; 1674 int remote_id, sock; 1675 1676 /* Read the remote channel number from the message. */ 1677 remote_id = packet_get_int(); 1678 packet_check_eom(); 1679 1680 /* 1681 * Get a connection to the local authentication agent (this may again 1682 * get forwarded). 1683 */ 1684 sock = ssh_get_authentication_socket(); 1685 1686 /* 1687 * If we could not connect the agent, send an error message back to 1688 * the server. This should never happen unless the agent dies, 1689 * because authentication forwarding is only enabled if we have an 1690 * agent. 1691 */ 1692 if (sock >= 0) { 1693 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, 1694 -1, 0, 0, 0, "authentication agent connection", 1); 1695 c->remote_id = remote_id; 1696 c->force_drain = 1; 1697 } 1698 if (c == NULL) { 1699 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); 1700 packet_put_int(remote_id); 1701 } else { 1702 /* Send a confirmation to the remote host. */ 1703 debug("Forwarding authentication connection."); 1704 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); 1705 packet_put_int(remote_id); 1706 packet_put_int(c->self); 1707 } 1708 packet_send(); 1709 } 1710 1711 static Channel * 1712 client_request_forwarded_tcpip(const char *request_type, int rchan) 1713 { 1714 Channel *c = NULL; 1715 char *listen_address, *originator_address; 1716 u_short listen_port, originator_port; 1717 1718 /* Get rest of the packet */ 1719 listen_address = packet_get_string(NULL); 1720 listen_port = packet_get_int(); 1721 originator_address = packet_get_string(NULL); 1722 originator_port = packet_get_int(); 1723 packet_check_eom(); 1724 1725 debug("client_request_forwarded_tcpip: listen %s port %d, " 1726 "originator %s port %d", listen_address, listen_port, 1727 originator_address, originator_port); 1728 1729 c = channel_connect_by_listen_address(listen_port, 1730 "forwarded-tcpip", originator_address); 1731 1732 xfree(originator_address); 1733 xfree(listen_address); 1734 return c; 1735 } 1736 1737 static Channel * 1738 client_request_x11(const char *request_type, int rchan) 1739 { 1740 Channel *c = NULL; 1741 char *originator; 1742 u_short originator_port; 1743 int sock; 1744 1745 if (!options.forward_x11) { 1746 error("Warning: ssh server tried X11 forwarding."); 1747 error("Warning: this is probably a break-in attempt by a " 1748 "malicious server."); 1749 return NULL; 1750 } 1751 if (x11_refuse_time != 0 && time(NULL) >= x11_refuse_time) { 1752 verbose("Rejected X11 connection after ForwardX11Timeout " 1753 "expired"); 1754 return NULL; 1755 } 1756 originator = packet_get_string(NULL); 1757 if (datafellows & SSH_BUG_X11FWD) { 1758 debug2("buggy server: x11 request w/o originator_port"); 1759 originator_port = 0; 1760 } else { 1761 originator_port = packet_get_int(); 1762 } 1763 packet_check_eom(); 1764 /* XXX check permission */ 1765 debug("client_request_x11: request from %s %d", originator, 1766 originator_port); 1767 xfree(originator); 1768 sock = x11_connect_display(); 1769 if (sock < 0) 1770 return NULL; 1771 /* again is this really necessary for X11? */ 1772 if (options.hpn_disabled) 1773 c = channel_new("x11", 1774 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 1775 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); 1776 else 1777 c = channel_new("x11", 1778 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 1779 options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); 1780 c->force_drain = 1; 1781 return c; 1782 } 1783 1784 static Channel * 1785 client_request_agent(const char *request_type, int rchan) 1786 { 1787 Channel *c = NULL; 1788 int sock; 1789 1790 if (!options.forward_agent) { 1791 error("Warning: ssh server tried agent forwarding."); 1792 error("Warning: this is probably a break-in attempt by a " 1793 "malicious server."); 1794 return NULL; 1795 } 1796 sock = ssh_get_authentication_socket(); 1797 if (sock < 0) 1798 return NULL; 1799 if (options.hpn_disabled) 1800 c = channel_new("authentication agent connection", 1801 SSH_CHANNEL_OPEN, sock, sock, -1, 1802 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, 1803 "authentication agent connection", 1); 1804 else 1805 c = channel_new("authentication agent connection", 1806 SSH_CHANNEL_OPEN, sock, sock, -1, 1807 options.hpn_buffer_size, options.hpn_buffer_size, 0, 1808 "authentication agent connection", 1); 1809 c->force_drain = 1; 1810 return c; 1811 } 1812 1813 int 1814 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun) 1815 { 1816 Channel *c; 1817 int fd; 1818 1819 if (tun_mode == SSH_TUNMODE_NO) 1820 return 0; 1821 1822 if (!compat20) { 1823 error("Tunnel forwarding is not supported for protocol 1"); 1824 return -1; 1825 } 1826 1827 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode); 1828 1829 /* Open local tunnel device */ 1830 if ((fd = tun_open(local_tun, tun_mode)) == -1) { 1831 error("Tunnel device open failed."); 1832 return -1; 1833 } 1834 1835 if(options.hpn_disabled) 1836 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, 1837 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 1838 0, "tun", 1); 1839 else 1840 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, 1841 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT, 1842 0, "tun", 1); 1843 c->datagram = 1; 1844 1845 1846 1847 #if defined(SSH_TUN_FILTER) 1848 if (options.tun_open == SSH_TUNMODE_POINTOPOINT) 1849 channel_register_filter(c->self, sys_tun_infilter, 1850 sys_tun_outfilter, NULL, NULL); 1851 #endif 1852 1853 packet_start(SSH2_MSG_CHANNEL_OPEN); 1854 packet_put_cstring("tun@openssh.com"); 1855 packet_put_int(c->self); 1856 packet_put_int(c->local_window_max); 1857 packet_put_int(c->local_maxpacket); 1858 packet_put_int(tun_mode); 1859 packet_put_int(remote_tun); 1860 packet_send(); 1861 1862 return 0; 1863 } 1864 1865 /* XXXX move to generic input handler */ 1866 static void 1867 client_input_channel_open(int type, u_int32_t seq, void *ctxt) 1868 { 1869 Channel *c = NULL; 1870 char *ctype; 1871 int rchan; 1872 u_int rmaxpack, rwindow, len; 1873 1874 ctype = packet_get_string(&len); 1875 rchan = packet_get_int(); 1876 rwindow = packet_get_int(); 1877 rmaxpack = packet_get_int(); 1878 1879 debug("client_input_channel_open: ctype %s rchan %d win %d max %d", 1880 ctype, rchan, rwindow, rmaxpack); 1881 1882 if (strcmp(ctype, "forwarded-tcpip") == 0) { 1883 c = client_request_forwarded_tcpip(ctype, rchan); 1884 } else if (strcmp(ctype, "x11") == 0) { 1885 c = client_request_x11(ctype, rchan); 1886 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { 1887 c = client_request_agent(ctype, rchan); 1888 } 1889 /* XXX duplicate : */ 1890 if (c != NULL) { 1891 debug("confirm %s", ctype); 1892 c->remote_id = rchan; 1893 c->remote_window = rwindow; 1894 c->remote_maxpacket = rmaxpack; 1895 if (c->type != SSH_CHANNEL_CONNECTING) { 1896 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); 1897 packet_put_int(c->remote_id); 1898 packet_put_int(c->self); 1899 packet_put_int(c->local_window); 1900 packet_put_int(c->local_maxpacket); 1901 packet_send(); 1902 } 1903 } else { 1904 debug("failure %s", ctype); 1905 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); 1906 packet_put_int(rchan); 1907 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); 1908 if (!(datafellows & SSH_BUG_OPENFAILURE)) { 1909 packet_put_cstring("open failed"); 1910 packet_put_cstring(""); 1911 } 1912 packet_send(); 1913 } 1914 xfree(ctype); 1915 } 1916 static void 1917 client_input_channel_req(int type, u_int32_t seq, void *ctxt) 1918 { 1919 Channel *c = NULL; 1920 int exitval, id, reply, success = 0; 1921 char *rtype; 1922 1923 id = packet_get_int(); 1924 rtype = packet_get_string(NULL); 1925 reply = packet_get_char(); 1926 1927 debug("client_input_channel_req: channel %d rtype %s reply %d", 1928 id, rtype, reply); 1929 1930 if (id == -1) { 1931 error("client_input_channel_req: request for channel -1"); 1932 } else if ((c = channel_lookup(id)) == NULL) { 1933 error("client_input_channel_req: channel %d: " 1934 "unknown channel", id); 1935 } else if (strcmp(rtype, "eow@openssh.com") == 0) { 1936 packet_check_eom(); 1937 chan_rcvd_eow(c); 1938 } else if (strcmp(rtype, "exit-status") == 0) { 1939 exitval = packet_get_int(); 1940 if (c->ctl_chan != -1) { 1941 mux_exit_message(c, exitval); 1942 success = 1; 1943 } else if (id == session_ident) { 1944 /* Record exit value of local session */ 1945 success = 1; 1946 exit_status = exitval; 1947 } else { 1948 /* Probably for a mux channel that has already closed */ 1949 debug("%s: no sink for exit-status on channel %d", 1950 __func__, id); 1951 } 1952 packet_check_eom(); 1953 } 1954 if (reply && c != NULL) { 1955 packet_start(success ? 1956 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); 1957 packet_put_int(c->remote_id); 1958 packet_send(); 1959 } 1960 xfree(rtype); 1961 } 1962 static void 1963 client_input_global_request(int type, u_int32_t seq, void *ctxt) 1964 { 1965 char *rtype; 1966 int want_reply; 1967 int success = 0; 1968 1969 rtype = packet_get_string(NULL); 1970 want_reply = packet_get_char(); 1971 debug("client_input_global_request: rtype %s want_reply %d", 1972 rtype, want_reply); 1973 if (want_reply) { 1974 packet_start(success ? 1975 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); 1976 packet_send(); 1977 packet_write_wait(); 1978 } 1979 xfree(rtype); 1980 } 1981 1982 void 1983 client_session2_setup(int id, int want_tty, int want_subsystem, 1984 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env) 1985 { 1986 int len; 1987 Channel *c = NULL; 1988 1989 debug2("%s: id %d", __func__, id); 1990 1991 if ((c = channel_lookup(id)) == NULL) 1992 fatal("client_session2_setup: channel %d: unknown channel", id); 1993 1994 packet_set_interactive(want_tty, 1995 options.ip_qos_interactive, options.ip_qos_bulk); 1996 1997 if (want_tty) { 1998 struct winsize ws; 1999 2000 /* Store window size in the packet. */ 2001 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) 2002 memset(&ws, 0, sizeof(ws)); 2003 2004 channel_request_start(id, "pty-req", 1); 2005 client_expect_confirm(id, "PTY allocation", 1); 2006 packet_put_cstring(term != NULL ? term : ""); 2007 packet_put_int((u_int)ws.ws_col); 2008 packet_put_int((u_int)ws.ws_row); 2009 packet_put_int((u_int)ws.ws_xpixel); 2010 packet_put_int((u_int)ws.ws_ypixel); 2011 if (tiop == NULL) 2012 tiop = get_saved_tio(); 2013 tty_make_modes(-1, tiop); 2014 packet_send(); 2015 /* XXX wait for reply */ 2016 c->client_tty = 1; 2017 } 2018 2019 /* Transfer any environment variables from client to server */ 2020 if (options.num_send_env != 0 && env != NULL) { 2021 int i, j, matched; 2022 char *name, *val; 2023 2024 debug("Sending environment."); 2025 for (i = 0; env[i] != NULL; i++) { 2026 /* Split */ 2027 name = xstrdup(env[i]); 2028 if ((val = strchr(name, '=')) == NULL) { 2029 xfree(name); 2030 continue; 2031 } 2032 *val++ = '\0'; 2033 2034 matched = 0; 2035 for (j = 0; j < options.num_send_env; j++) { 2036 if (match_pattern(name, options.send_env[j])) { 2037 matched = 1; 2038 break; 2039 } 2040 } 2041 if (!matched) { 2042 debug3("Ignored env %s", name); 2043 xfree(name); 2044 continue; 2045 } 2046 2047 debug("Sending env %s = %s", name, val); 2048 channel_request_start(id, "env", 0); 2049 packet_put_cstring(name); 2050 packet_put_cstring(val); 2051 packet_send(); 2052 xfree(name); 2053 } 2054 } 2055 2056 len = buffer_len(cmd); 2057 if (len > 0) { 2058 if (len > 900) 2059 len = 900; 2060 if (want_subsystem) { 2061 debug("Sending subsystem: %.*s", 2062 len, (u_char*)buffer_ptr(cmd)); 2063 channel_request_start(id, "subsystem", 1); 2064 client_expect_confirm(id, "subsystem", 1); 2065 } else { 2066 debug("Sending command: %.*s", 2067 len, (u_char*)buffer_ptr(cmd)); 2068 channel_request_start(id, "exec", 1); 2069 client_expect_confirm(id, "exec", 1); 2070 } 2071 packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); 2072 packet_send(); 2073 } else { 2074 channel_request_start(id, "shell", 1); 2075 client_expect_confirm(id, "shell", 1); 2076 packet_send(); 2077 } 2078 } 2079 2080 static void 2081 client_init_dispatch_20(void) 2082 { 2083 dispatch_init(&dispatch_protocol_error); 2084 2085 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); 2086 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); 2087 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); 2088 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); 2089 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); 2090 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 2091 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 2092 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); 2093 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); 2094 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm); 2095 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm); 2096 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); 2097 2098 /* rekeying */ 2099 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); 2100 2101 /* global request reply messages */ 2102 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); 2103 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); 2104 } 2105 2106 static void 2107 client_init_dispatch_13(void) 2108 { 2109 dispatch_init(NULL); 2110 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); 2111 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); 2112 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); 2113 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 2114 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 2115 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); 2116 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); 2117 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); 2118 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); 2119 2120 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? 2121 &client_input_agent_open : &deny_input_open); 2122 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? 2123 &x11_input_open : &deny_input_open); 2124 } 2125 2126 static void 2127 client_init_dispatch_15(void) 2128 { 2129 client_init_dispatch_13(); 2130 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); 2131 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); 2132 } 2133 2134 static void 2135 client_init_dispatch(void) 2136 { 2137 if (compat20) 2138 client_init_dispatch_20(); 2139 else if (compat13) 2140 client_init_dispatch_13(); 2141 else 2142 client_init_dispatch_15(); 2143 } 2144 2145 /* client specific fatal cleanup */ 2146 void 2147 cleanup_exit(int i) 2148 { 2149 leave_raw_mode(force_tty_flag); 2150 leave_non_blocking(); 2151 if (options.control_path != NULL && muxserver_sock != -1) 2152 unlink(options.control_path); 2153 ssh_kill_proxy_command(); 2154 _exit(i); 2155 } 2156