clientloop.c

   1 /* $OpenBSD: clientloop.c,v 1.196 2008/06/12 04:06:00 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 "monitor_fdpass.h"
 111 #include "match.h"
 112 #include "msg.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;
 125
 126 /*
 127  * Name of the host we are connecting to.  This is the name given on the
 128  * command line, or the HostName specified for the user-supplied name in a
 129  * configuration file.
 130  */
 131 extern char *host;
 132
 133 /*
 134  * Flag to indicate that we have received a window change signal which has
 135  * not yet been processed.  This will cause a message indicating the new
 136  * window size to be sent to the server a little later.  This is volatile
 137  * because this is updated in a signal handler.
 138  */
 139 static volatile sig_atomic_t received_window_change_signal = 0;
 140 static volatile sig_atomic_t received_signal = 0;
 141
 142 /* Flag indicating whether the user's terminal is in non-blocking mode. */
 143 static int in_non_blocking_mode = 0;
 144
 145 /* Common data for the client loop code. */
 146 static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
 147 static int escape_char1;        /* Escape character. (proto1 only) */
 148 static int escape_pending1;     /* Last character was an escape (proto1 only) */
 149 static int last_was_cr;         /* Last character was a newline. */
 150 static int exit_status;         /* Used to store the exit status of the command. */
 151 static int stdin_eof;           /* EOF has been encountered on standard error. */
 152 static Buffer stdin_buffer;     /* Buffer for stdin data. */
 153 static Buffer stdout_buffer;    /* Buffer for stdout data. */
 154 static Buffer stderr_buffer;    /* Buffer for stderr data. */
 155 static u_long stdin_bytes, stdout_bytes, stderr_bytes;
 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 = 0;  /* In SSH2: login session closed. */
 161
 162 static void client_init_dispatch(void);
 163 int     session_ident = -1;
 164
 165 /* Track escape per proto2 channel */
 166 struct escape_filter_ctx {
 167         int escape_pending;
 168         int escape_char;
 169 };
 170
 171 /* Context for channel confirmation replies */
 172 struct channel_reply_ctx {
 173         const char *request_type;
 174         int id, do_close;
 175 };
 176
 177 /* Global request success/failure callbacks */
 178 struct global_confirm {
 179         TAILQ_ENTRY(global_confirm) entry;
 180         global_confirm_cb *cb;
 181         void *ctx;
 182         int ref_count;
 183 };
 184 TAILQ_HEAD(global_confirms, global_confirm);
 185 static struct global_confirms global_confirms =
 186     TAILQ_HEAD_INITIALIZER(global_confirms);
 187
 188 /*XXX*/
 189 extern Kex *xxx_kex;
 190
 191 void ssh_process_session2_setup(int, int, int, Buffer *);
 192
 193 /* Restores stdin to blocking mode. */
 194
 195 static void
 196 leave_non_blocking(void)
 197 {
 198         if (in_non_blocking_mode) {
 199                 unset_nonblock(fileno(stdin));
 200                 in_non_blocking_mode = 0;
 201         }
 202 }
 203
 204 /* Puts stdin terminal in non-blocking mode. */
 205
 206 static void
 207 enter_non_blocking(void)
 208 {
 209         in_non_blocking_mode = 1;
 210         set_nonblock(fileno(stdin));
 211 }
 212
 213 /*
 214  * Signal handler for the window change signal (SIGWINCH).  This just sets a
 215  * flag indicating that the window has changed.
 216  */
 217 /*ARGSUSED */
 218 static void
 219 window_change_handler(int sig)
 220 {
 221         received_window_change_signal = 1;
 222         signal(SIGWINCH, window_change_handler);
 223 }
 224
 225 /*
 226  * Signal handler for signals that cause the program to terminate.  These
 227  * signals must be trapped to restore terminal modes.
 228  */
 229 /*ARGSUSED */
 230 static void
 231 signal_handler(int sig)
 232 {
 233         received_signal = sig;
 234         quit_pending = 1;
 235 }
 236
 237 /*
 238  * Returns current time in seconds from Jan 1, 1970 with the maximum
 239  * available resolution.
 240  */
 241
 242 static double
 243 get_current_time(void)
 244 {
 245         struct timeval tv;
 246         gettimeofday(&tv, NULL);
 247         return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
 248 }
 249
 250 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
 251 void
 252 client_x11_get_proto(const char *display, const char *xauth_path,
 253     u_int trusted, char **_proto, char **_data)
 254 {
 255         char cmd[1024];
 256         char line[512];
 257         char xdisplay[512];
 258         static char proto[512], data[512];
 259         FILE *f;
 260         int got_data = 0, generated = 0, do_unlink = 0, i;
 261         char *xauthdir, *xauthfile;
 262         struct stat st;
 263
 264         xauthdir = xauthfile = NULL;
 265         *_proto = proto;
 266         *_data = data;
 267         proto[0] = data[0] = '\0';
 268
 269         if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
 270                 debug("No xauth program.");
 271         } else {
 272                 if (display == NULL) {
 273                         debug("x11_get_proto: DISPLAY not set");
 274                         return;
 275                 }
 276                 /*
 277                  * Handle FamilyLocal case where $DISPLAY does
 278                  * not match an authorization entry.  For this we
 279                  * just try "xauth list unix:displaynum.screennum".
 280                  * XXX: "localhost" match to determine FamilyLocal
 281                  *      is not perfect.
 282                  */
 283                 if (strncmp(display, "localhost:", 10) == 0) {
 284                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
 285                             display + 10);
 286                         display = xdisplay;
 287                 }
 288                 if (trusted == 0) {
 289                         xauthdir = xmalloc(MAXPATHLEN);
 290                         xauthfile = xmalloc(MAXPATHLEN);
 291                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
 292                         if (mkdtemp(xauthdir) != NULL) {
 293                                 do_unlink = 1;
 294                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
 295                                     xauthdir);
 296                                 snprintf(cmd, sizeof(cmd),
 297                                     "%s -f %s generate %s " SSH_X11_PROTO
 298                                     " untrusted timeout 1200 2>" _PATH_DEVNULL,
 299                                     xauth_path, xauthfile, display);
 300                                 debug2("x11_get_proto: %s", cmd);
 301                                 if (system(cmd) == 0)
 302                                         generated = 1;
 303                         }
 304                 }
 305
 306                 /*
 307                  * When in untrusted mode, we read the cookie only if it was
 308                  * successfully generated as an untrusted one in the step
 309                  * above.
 310                  */
 311                 if (trusted || generated) {
 312                         snprintf(cmd, sizeof(cmd),
 313                             "%s %s%s list %s 2>" _PATH_DEVNULL,
 314                             xauth_path,
 315                             generated ? "-f " : "" ,
 316                             generated ? xauthfile : "",
 317                             display);
 318                         debug2("x11_get_proto: %s", cmd);
 319                         f = popen(cmd, "r");
 320                         if (f && fgets(line, sizeof(line), f) &&
 321                             sscanf(line, "%*s %511s %511s", proto, data) == 2)
 322                                 got_data = 1;
 323                         if (f)
 324                                 pclose(f);
 325                 } else
 326                         error("Warning: untrusted X11 forwarding setup failed: "
 327                             "xauth key data not generated");
 328         }
 329
 330         if (do_unlink) {
 331                 unlink(xauthfile);
 332                 rmdir(xauthdir);
 333         }
 334         if (xauthdir)
 335                 xfree(xauthdir);
 336         if (xauthfile)
 337                 xfree(xauthfile);
 338
 339         /*
 340          * If we didn't get authentication data, just make up some
 341          * data.  The forwarding code will check the validity of the
 342          * response anyway, and substitute this data.  The X11
 343          * server, however, will ignore this fake data and use
 344          * whatever authentication mechanisms it was using otherwise
 345          * for the local connection.
 346          */
 347         if (!got_data) {
 348                 u_int32_t rnd = 0;
 349
 350                 logit("Warning: No xauth data; "
 351                     "using fake authentication data for X11 forwarding.");
 352                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
 353                 for (i = 0; i < 16; i++) {
 354                         if (i % 4 == 0)
 355                                 rnd = arc4random();
 356                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
 357                             rnd & 0xff);
 358                         rnd >>= 8;
 359                 }
 360         }
 361 }
 362
 363 /*
 364  * This is called when the interactive is entered.  This checks if there is
 365  * an EOF coming on stdin.  We must check this explicitly, as select() does
 366  * not appear to wake up when redirecting from /dev/null.
 367  */
 368
 369 static void
 370 client_check_initial_eof_on_stdin(void)
 371 {
 372         int len;
 373         char buf[1];
 374
 375         /*
 376          * If standard input is to be "redirected from /dev/null", we simply
 377          * mark that we have seen an EOF and send an EOF message to the
 378          * server. Otherwise, we try to read a single character; it appears
 379          * that for some files, such /dev/null, select() never wakes up for
 380          * read for this descriptor, which means that we never get EOF.  This
 381          * way we will get the EOF if stdin comes from /dev/null or similar.
 382          */
 383         if (stdin_null_flag) {
 384                 /* Fake EOF on stdin. */
 385                 debug("Sending eof.");
 386                 stdin_eof = 1;
 387                 packet_start(SSH_CMSG_EOF);
 388                 packet_send();
 389         } else {
 390                 enter_non_blocking();
 391
 392                 /* Check for immediate EOF on stdin. */
 393                 len = read(fileno(stdin), buf, 1);
 394                 if (len == 0) {
 395                         /* EOF.  Record that we have seen it and send EOF to server. */
 396                         debug("Sending eof.");
 397                         stdin_eof = 1;
 398                         packet_start(SSH_CMSG_EOF);
 399                         packet_send();
 400                 } else if (len > 0) {
 401                         /*
 402                          * Got data.  We must store the data in the buffer,
 403                          * and also process it as an escape character if
 404                          * appropriate.
 405                          */
 406                         if ((u_char) buf[0] == escape_char1)
 407                                 escape_pending1 = 1;
 408                         else
 409                                 buffer_append(&stdin_buffer, buf, 1);
 410                 }
 411                 leave_non_blocking();
 412         }
 413 }
 414
 415
 416 /*
 417  * Make packets from buffered stdin data, and buffer them for sending to the
 418  * connection.
 419  */
 420
 421 static void
 422 client_make_packets_from_stdin_data(void)
 423 {
 424         u_int len;
 425
 426         /* Send buffered stdin data to the server. */
 427         while (buffer_len(&stdin_buffer) > 0 &&
 428             packet_not_very_much_data_to_write()) {
 429                 len = buffer_len(&stdin_buffer);
 430                 /* Keep the packets at reasonable size. */
 431                 if (len > packet_get_maxsize())
 432                         len = packet_get_maxsize();
 433                 packet_start(SSH_CMSG_STDIN_DATA);
 434                 packet_put_string(buffer_ptr(&stdin_buffer), len);
 435                 packet_send();
 436                 buffer_consume(&stdin_buffer, len);
 437                 stdin_bytes += len;
 438                 /* If we have a pending EOF, send it now. */
 439                 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
 440                         packet_start(SSH_CMSG_EOF);
 441                         packet_send();
 442                 }
 443         }
 444 }
 445
 446 /*
 447  * Checks if the client window has changed, and sends a packet about it to
 448  * the server if so.  The actual change is detected elsewhere (by a software
 449  * interrupt on Unix); this just checks the flag and sends a message if
 450  * appropriate.
 451  */
 452
 453 static void
 454 client_check_window_change(void)
 455 {
 456         struct winsize ws;
 457
 458         if (! received_window_change_signal)
 459                 return;
 460         /** XXX race */
 461         received_window_change_signal = 0;
 462
 463         debug2("client_check_window_change: changed");
 464
 465         if (compat20) {
 466                 channel_send_window_changes();
 467         } else {
 468                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
 469                         return;
 470                 packet_start(SSH_CMSG_WINDOW_SIZE);
 471                 packet_put_int((u_int)ws.ws_row);
 472                 packet_put_int((u_int)ws.ws_col);
 473                 packet_put_int((u_int)ws.ws_xpixel);
 474                 packet_put_int((u_int)ws.ws_ypixel);
 475                 packet_send();
 476         }
 477 }
 478
 479 static void
 480 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
 481 {
 482         struct global_confirm *gc;
 483
 484         if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
 485                 return;
 486         if (gc->cb != NULL)
 487                 gc->cb(type, seq, gc->ctx);
 488         if (--gc->ref_count <= 0) {
 489                 TAILQ_REMOVE(&global_confirms, gc, entry);
 490                 bzero(gc, sizeof(*gc));
 491                 xfree(gc);
 492         }
 493
 494         keep_alive_timeouts = 0;
 495 }
 496
 497 static void
 498 server_alive_check(void)
 499 {
 500         if (++keep_alive_timeouts > options.server_alive_count_max) {
 501                 logit("Timeout, server not responding.");
 502                 cleanup_exit(255);
 503         }
 504         packet_start(SSH2_MSG_GLOBAL_REQUEST);
 505         packet_put_cstring("keepalive@openssh.com");
 506         packet_put_char(1);     /* boolean: want reply */
 507         packet_send();
 508         /* Insert an empty placeholder to maintain ordering */
 509         client_register_global_confirm(NULL, NULL);
 510 }
 511
 512 /*
 513  * Waits until the client can do something (some data becomes available on
 514  * one of the file descriptors).
 515  */
 516 static void
 517 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
 518     int *maxfdp, u_int *nallocp, int rekeying)
 519 {
 520         struct timeval tv, *tvp;
 521         int ret;
 522
 523         /* Add any selections by the channel mechanism. */
 524         channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
 525
 526         if (!compat20) {
 527                 /* Read from the connection, unless our buffers are full. */
 528                 if (buffer_len(&stdout_buffer) < buffer_high &&
 529                     buffer_len(&stderr_buffer) < buffer_high &&
 530                     channel_not_very_much_buffered_data())
 531                         FD_SET(connection_in, *readsetp);
 532                 /*
 533                  * Read from stdin, unless we have seen EOF or have very much
 534                  * buffered data to send to the server.
 535                  */
 536                 if (!stdin_eof && packet_not_very_much_data_to_write())
 537                         FD_SET(fileno(stdin), *readsetp);
 538
 539                 /* Select stdout/stderr if have data in buffer. */
 540                 if (buffer_len(&stdout_buffer) > 0)
 541                         FD_SET(fileno(stdout), *writesetp);
 542                 if (buffer_len(&stderr_buffer) > 0)
 543                         FD_SET(fileno(stderr), *writesetp);
 544         } else {
 545                 /* channel_prepare_select could have closed the last channel */
 546                 if (session_closed && !channel_still_open() &&
 547                     !packet_have_data_to_write()) {
 548                         /* clear mask since we did not call select() */
 549                         memset(*readsetp, 0, *nallocp);
 550                         memset(*writesetp, 0, *nallocp);
 551                         return;
 552                 } else {
 553                         FD_SET(connection_in, *readsetp);
 554                 }
 555         }
 556
 557         /* Select server connection if have data to write to the server. */
 558         if (packet_have_data_to_write())
 559                 FD_SET(connection_out, *writesetp);
 560
 561         if (muxserver_sock != -1)
 562                 FD_SET(muxserver_sock, *readsetp);
 563
 564         /*
 565          * Wait for something to happen.  This will suspend the process until
 566          * some selected descriptor can be read, written, or has some other
 567          * event pending.
 568          */
 569
 570         if (options.server_alive_interval == 0 || !compat20)
 571                 tvp = NULL;
 572         else {
 573                 tv.tv_sec = options.server_alive_interval;
 574                 tv.tv_usec = 0;
 575                 tvp = &tv;
 576         }
 577         ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
 578         if (ret < 0) {
 579                 char buf[100];
 580
 581                 /*
 582                  * We have to clear the select masks, because we return.
 583                  * We have to return, because the mainloop checks for the flags
 584                  * set by the signal handlers.
 585                  */
 586                 memset(*readsetp, 0, *nallocp);
 587                 memset(*writesetp, 0, *nallocp);
 588
 589                 if (errno == EINTR)
 590                         return;
 591                 /* Note: we might still have data in the buffers. */
 592                 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
 593                 buffer_append(&stderr_buffer, buf, strlen(buf));
 594                 quit_pending = 1;
 595         } else if (ret == 0)
 596                 server_alive_check();
 597 }
 598
 599 static void
 600 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
 601 {
 602         /* Flush stdout and stderr buffers. */
 603         if (buffer_len(bout) > 0)
 604                 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
 605         if (buffer_len(berr) > 0)
 606                 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
 607
 608         leave_raw_mode();
 609
 610         /*
 611          * Free (and clear) the buffer to reduce the amount of data that gets
 612          * written to swap.
 613          */
 614         buffer_free(bin);
 615         buffer_free(bout);
 616         buffer_free(berr);
 617
 618         /* Send the suspend signal to the program itself. */
 619         kill(getpid(), SIGTSTP);
 620
 621         /* Reset window sizes in case they have changed */
 622         received_window_change_signal = 1;
 623
 624         /* OK, we have been continued by the user. Reinitialize buffers. */
 625         buffer_init(bin);
 626         buffer_init(bout);
 627         buffer_init(berr);
 628
 629         enter_raw_mode();
 630 }
 631
 632 static void
 633 client_process_net_input(fd_set *readset)
 634 {
 635         int len;
 636         char buf[8192];
 637
 638         /*
 639          * Read input from the server, and add any such data to the buffer of
 640          * the packet subsystem.
 641          */
 642         if (FD_ISSET(connection_in, readset)) {
 643                 /* Read as much as possible. */
 644                 len = read(connection_in, buf, sizeof(buf));
 645                 if (len == 0) {
 646                         /* Received EOF.  The remote host has closed the connection. */
 647                         snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
 648                                  host);
 649                         buffer_append(&stderr_buffer, buf, strlen(buf));
 650                         quit_pending = 1;
 651                         return;
 652                 }
 653                 /*
 654                  * There is a kernel bug on Solaris that causes select to
 655                  * sometimes wake up even though there is no data available.
 656                  */
 657                 if (len < 0 && (errno == EAGAIN || errno == EINTR))
 658                         len = 0;
 659
 660                 if (len < 0) {
 661                         /* An error has encountered.  Perhaps there is a network problem. */
 662                         snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
 663                                  host, strerror(errno));
 664                         buffer_append(&stderr_buffer, buf, strlen(buf));
 665                         quit_pending = 1;
 666                         return;
 667                 }
 668                 packet_process_incoming(buf, len);
 669         }
 670 }
 671
 672 static void
 673 client_status_confirm(int type, Channel *c, void *ctx)
 674 {
 675         struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
 676         char errmsg[256];
 677         int tochan;
 678
 679         /* XXX supress on mux _client_ quietmode */
 680         tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
 681             c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
 682
 683         if (type == SSH2_MSG_CHANNEL_SUCCESS) {
 684                 debug2("%s request accepted on channel %d",
 685                     cr->request_type, c->self);
 686         } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
 687                 if (tochan) {
 688                         snprintf(errmsg, sizeof(errmsg),
 689                             "%s request failed\r\n", cr->request_type);
 690                 } else {
 691                         snprintf(errmsg, sizeof(errmsg),
 692                             "%s request failed on channel %d",
 693                             cr->request_type, c->self);
 694                 }
 695                 /* If error occurred on primary session channel, then exit */
 696                 if (cr->do_close && c->self == session_ident)
 697                         fatal("%s", errmsg);
 698                 /* If error occurred on mux client, append to their stderr */
 699                 if (tochan)
 700                         buffer_append(&c->extended, errmsg, strlen(errmsg));
 701                 else
 702                         error("%s", errmsg);
 703                 if (cr->do_close) {
 704                         chan_read_failed(c);
 705                         chan_write_failed(c);
 706                 }
 707         }
 708         xfree(cr);
 709 }
 710
 711 static void
 712 client_abandon_status_confirm(Channel *c, void *ctx)
 713 {
 714         xfree(ctx);
 715 }
 716
 717 static void
 718 client_expect_confirm(int id, const char *request, int do_close)
 719 {
 720         struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
 721
 722         cr->request_type = request;
 723         cr->do_close = do_close;
 724
 725         channel_register_status_confirm(id, client_status_confirm,
 726             client_abandon_status_confirm, cr);
 727 }
 728
 729 void
 730 client_register_global_confirm(global_confirm_cb *cb, void *ctx)
 731 {
 732         struct global_confirm *gc, *first_gc;
 733
 734         /* Coalesce identical callbacks */
 735         first_gc = TAILQ_FIRST(&global_confirms);
 736         if (first_gc && first_gc->cb == cb && first_gc->ctx == ctx) {
 737                 if (++first_gc->ref_count >= INT_MAX)
 738                         fatal("%s: first_gc->ref_count = %d",
 739                             __func__, first_gc->ref_count);
 740                 return;
 741         }
 742
 743         gc = xmalloc(sizeof(*gc));
 744         gc->cb = cb;
 745         gc->ctx = ctx;
 746         gc->ref_count = 1;
 747         TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
 748 }
 749
 750 static void
 751 process_cmdline(void)
 752 {
 753         void (*handler)(int);
 754         char *s, *cmd, *cancel_host;
 755         int delete = 0;
 756         int local = 0;
 757         u_short cancel_port;
 758         Forward fwd;
 759
 760         bzero(&fwd, sizeof(fwd));
 761         fwd.listen_host = fwd.connect_host = NULL;
 762
 763         leave_raw_mode();
 764         handler = signal(SIGINT, SIG_IGN);
 765         cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
 766         if (s == NULL)
 767                 goto out;
 768         while (isspace(*s))
 769                 s++;
 770         if (*s == '-')
 771                 s++;    /* Skip cmdline '-', if any */
 772         if (*s == '\0')
 773                 goto out;
 774
 775         if (*s == 'h' || *s == 'H' || *s == '?') {
 776                 logit("Commands:");
 777                 logit("      -L[bind_address:]port:host:hostport    "
 778                     "Request local forward");
 779                 logit("      -R[bind_address:]port:host:hostport    "
 780                     "Request remote forward");
 781                 logit("      -KR[bind_address:]port                 "
 782                     "Cancel remote forward");
 783                 if (!options.permit_local_command)
 784                         goto out;
 785                 logit("      !args                                  "
 786                     "Execute local command");
 787                 goto out;
 788         }
 789
 790         if (*s == '!' && options.permit_local_command) {
 791                 s++;
 792                 ssh_local_cmd(s);
 793                 goto out;
 794         }
 795
 796         if (*s == 'K') {
 797                 delete = 1;
 798                 s++;
 799         }
 800         if (*s != 'L' && *s != 'R') {
 801                 logit("Invalid command.");
 802                 goto out;
 803         }
 804         if (*s == 'L')
 805                 local = 1;
 806         if (local && delete) {
 807                 logit("Not supported.");
 808                 goto out;
 809         }
 810         if ((!local || delete) && !compat20) {
 811                 logit("Not supported for SSH protocol version 1.");
 812                 goto out;
 813         }
 814
 815         while (isspace(*++s))
 816                 ;
 817
 818         if (delete) {
 819                 cancel_port = 0;
 820                 cancel_host = hpdelim(&s);      /* may be NULL */
 821                 if (s != NULL) {
 822                         cancel_port = a2port(s);
 823                         cancel_host = cleanhostname(cancel_host);
 824                 } else {
 825                         cancel_port = a2port(cancel_host);
 826                         cancel_host = NULL;
 827                 }
 828                 if (cancel_port == 0) {
 829                         logit("Bad forwarding close port");
 830                         goto out;
 831                 }
 832                 channel_request_rforward_cancel(cancel_host, cancel_port);
 833         } else {
 834                 if (!parse_forward(&fwd, s)) {
 835                         logit("Bad forwarding specification.");
 836                         goto out;
 837                 }
 838                 if (local) {
 839                         if (channel_setup_local_fwd_listener(fwd.listen_host,
 840                             fwd.listen_port, fwd.connect_host,
 841                             fwd.connect_port, options.gateway_ports) < 0) {
 842                                 logit("Port forwarding failed.");
 843                                 goto out;
 844                         }
 845                 } else {
 846                         if (channel_request_remote_forwarding(fwd.listen_host,
 847                             fwd.listen_port, fwd.connect_host,
 848                             fwd.connect_port) < 0) {
 849                                 logit("Port forwarding failed.");
 850                                 goto out;
 851                         }
 852                 }
 853
 854                 logit("Forwarding port.");
 855         }
 856
 857 out:
 858         signal(SIGINT, handler);
 859         enter_raw_mode();
 860         if (cmd)
 861                 xfree(cmd);
 862         if (fwd.listen_host != NULL)
 863                 xfree(fwd.listen_host);
 864         if (fwd.connect_host != NULL)
 865                 xfree(fwd.connect_host);
 866 }
 867
 868 /*
 869  * Process the characters one by one, call with c==NULL for proto1 case.
 870  */
 871 static int
 872 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
 873     char *buf, int len)
 874 {
 875         char string[1024];
 876         pid_t pid;
 877         int bytes = 0;
 878         u_int i;
 879         u_char ch;
 880         char *s;
 881         int *escape_pendingp, escape_char;
 882         struct escape_filter_ctx *efc;
 883
 884         if (c == NULL) {
 885                 escape_pendingp = &escape_pending1;
 886                 escape_char = escape_char1;
 887         } else {
 888                 if (c->filter_ctx == NULL)
 889                         return 0;
 890                 efc = (struct escape_filter_ctx *)c->filter_ctx;
 891                 escape_pendingp = &efc->escape_pending;
 892                 escape_char = efc->escape_char;
 893         }
 894
 895         if (len <= 0)
 896                 return (0);
 897
 898         for (i = 0; i < (u_int)len; i++) {
 899                 /* Get one character at a time. */
 900                 ch = buf[i];
 901
 902                 if (*escape_pendingp) {
 903                         /* We have previously seen an escape character. */
 904                         /* Clear the flag now. */
 905                         *escape_pendingp = 0;
 906
 907                         /* Process the escaped character. */
 908                         switch (ch) {
 909                         case '.':
 910                                 /* Terminate the connection. */
 911                                 snprintf(string, sizeof string, "%c.\r\n",
 912                                     escape_char);
 913                                 buffer_append(berr, string, strlen(string));
 914
 915                                 if (c && c->ctl_fd != -1) {
 916                                         chan_read_failed(c);
 917                                         chan_write_failed(c);
 918                                         return 0;
 919                                 } else
 920                                         quit_pending = 1;
 921                                 return -1;
 922
 923                         case 'Z' - 64:
 924                                 /* XXX support this for mux clients */
 925                                 if (c && c->ctl_fd != -1) {
 926  noescape:
 927                                         snprintf(string, sizeof string,
 928                                             "%c%c escape not available to "
 929                                             "multiplexed sessions\r\n",
 930                                             escape_char, ch);
 931                                         buffer_append(berr, string,
 932                                             strlen(string));
 933                                         continue;
 934                                 }
 935                                 /* Suspend the program. */
 936                                 /* Print a message to that effect to the user. */
 937                                 snprintf(string, sizeof string,
 938                                     "%c^Z [suspend ssh]\r\n", escape_char);
 939                                 buffer_append(berr, string, strlen(string));
 940
 941                                 /* Restore terminal modes and suspend. */
 942                                 client_suspend_self(bin, bout, berr);
 943
 944                                 /* We have been continued. */
 945                                 continue;
 946
 947                         case 'B':
 948                                 if (compat20) {
 949                                         snprintf(string, sizeof string,
 950                                             "%cB\r\n", escape_char);
 951                                         buffer_append(berr, string,
 952                                             strlen(string));
 953                                         channel_request_start(session_ident,
 954                                             "break", 0);
 955                                         packet_put_int(1000);
 956                                         packet_send();
 957                                 }
 958                                 continue;
 959
 960                         case 'R':
 961                                 if (compat20) {
 962                                         if (datafellows & SSH_BUG_NOREKEY)
 963                                                 logit("Server does not support re-keying");
 964                                         else
 965                                                 need_rekeying = 1;
 966                                 }
 967                                 continue;
 968
 969                         case '&':
 970                                 if (c && c->ctl_fd != -1)
 971                                         goto noescape;
 972                                 /*
 973                                  * Detach the program (continue to serve connections,
 974                                  * but put in background and no more new connections).
 975                                  */
 976                                 /* Restore tty modes. */
 977                                 leave_raw_mode();
 978
 979                                 /* Stop listening for new connections. */
 980                                 channel_stop_listening();
 981
 982                                 snprintf(string, sizeof string,
 983                                     "%c& [backgrounded]\n", escape_char);
 984                                 buffer_append(berr, string, strlen(string));
 985
 986                                 /* Fork into background. */
 987                                 pid = fork();
 988                                 if (pid < 0) {
 989                                         error("fork: %.100s", strerror(errno));
 990                                         continue;
 991                                 }
 992                                 if (pid != 0) { /* This is the parent. */
 993                                         /* The parent just exits. */
 994                                         exit(0);
 995                                 }
 996                                 /* The child continues serving connections. */
 997                                 if (compat20) {
 998                                         buffer_append(bin, "\004", 1);
 999                                         /* fake EOF on stdin */
1000                                         return -1;
1001                                 } else if (!stdin_eof) {
1002                                         /*
1003                                          * Sending SSH_CMSG_EOF alone does not always appear
1004                                          * to be enough.  So we try to send an EOF character
1005                                          * first.
1006                                          */
1007                                         packet_start(SSH_CMSG_STDIN_DATA);
1008                                         packet_put_string("\004", 1);
1009                                         packet_send();
1010                                         /* Close stdin. */
1011                                         stdin_eof = 1;
1012                                         if (buffer_len(bin) == 0) {
1013                                                 packet_start(SSH_CMSG_EOF);
1014                                                 packet_send();
1015                                         }
1016                                 }
1017                                 continue;
1018
1019                         case '?':
1020                                 if (c && c->ctl_fd != -1) {
1021                                         snprintf(string, sizeof string,
1022 "%c?\r\n\
1023 Supported escape sequences:\r\n\
1024   %c.  - terminate session\r\n\
1025   %cB  - send a BREAK to the remote system\r\n\
1026   %cC  - open a command line\r\n\
1027   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1028   %c#  - list forwarded connections\r\n\
1029   %c?  - this message\r\n\
1030   %c%c  - send the escape character by typing it twice\r\n\
1031 (Note that escapes are only recognized immediately after newline.)\r\n",
1032                                             escape_char, escape_char,
1033                                             escape_char, escape_char,
1034                                             escape_char, escape_char,
1035                                             escape_char, escape_char,
1036                                             escape_char);
1037                                 } else {
1038                                         snprintf(string, sizeof string,
1039 "%c?\r\n\
1040 Supported escape sequences:\r\n\
1041   %c.  - terminate connection (and any multiplexed sessions)\r\n\
1042   %cB  - send a BREAK to the remote system\r\n\
1043   %cC  - open a command line\r\n\
1044   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1045   %c^Z - suspend ssh\r\n\
1046   %c#  - list forwarded connections\r\n\
1047   %c&  - background ssh (when waiting for connections to terminate)\r\n\
1048   %c?  - this message\r\n\
1049   %c%c  - send the escape character by typing it twice\r\n\
1050 (Note that escapes are only recognized immediately after newline.)\r\n",
1051                                             escape_char, escape_char,
1052                                             escape_char, escape_char,
1053                                             escape_char, escape_char,
1054                                             escape_char, escape_char,
1055                                             escape_char, escape_char,
1056                                             escape_char);
1057                                 }
1058                                 buffer_append(berr, string, strlen(string));
1059                                 continue;
1060
1061                         case '#':
1062                                 snprintf(string, sizeof string, "%c#\r\n",
1063                                     escape_char);
1064                                 buffer_append(berr, string, strlen(string));
1065                                 s = channel_open_message();
1066                                 buffer_append(berr, s, strlen(s));
1067                                 xfree(s);
1068                                 continue;
1069
1070                         case 'C':
1071                                 process_cmdline();
1072                                 continue;
1073
1074                         default:
1075                                 if (ch != escape_char) {
1076                                         buffer_put_char(bin, escape_char);
1077                                         bytes++;
1078                                 }
1079                                 /* Escaped characters fall through here */
1080                                 break;
1081                         }
1082                 } else {
1083                         /*
1084                          * The previous character was not an escape char. Check if this
1085                          * is an escape.
1086                          */
1087                         if (last_was_cr && ch == escape_char) {
1088                                 /* It is. Set the flag and continue to next character. */
1089                                 *escape_pendingp = 1;
1090                                 continue;
1091                         }
1092                 }
1093
1094                 /*
1095                  * Normal character.  Record whether it was a newline,
1096                  * and append it to the buffer.
1097                  */
1098                 last_was_cr = (ch == '\r' || ch == '\n');
1099                 buffer_put_char(bin, ch);
1100                 bytes++;
1101         }
1102         return bytes;
1103 }
1104
1105 static void
1106 client_process_input(fd_set *readset)
1107 {
1108         int len;
1109         char buf[8192];
1110
1111         /* Read input from stdin. */
1112         if (FD_ISSET(fileno(stdin), readset)) {
1113                 /* Read as much as possible. */
1114                 len = read(fileno(stdin), buf, sizeof(buf));
1115                 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1116                         return;         /* we'll try again later */
1117                 if (len <= 0) {
1118                         /*
1119                          * Received EOF or error.  They are treated
1120                          * similarly, except that an error message is printed
1121                          * if it was an error condition.
1122                          */
1123                         if (len < 0) {
1124                                 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1125                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1126                         }
1127                         /* Mark that we have seen EOF. */
1128                         stdin_eof = 1;
1129                         /*
1130                          * Send an EOF message to the server unless there is
1131                          * data in the buffer.  If there is data in the
1132                          * buffer, no message will be sent now.  Code
1133                          * elsewhere will send the EOF when the buffer
1134                          * becomes empty if stdin_eof is set.
1135                          */
1136                         if (buffer_len(&stdin_buffer) == 0) {
1137                                 packet_start(SSH_CMSG_EOF);
1138                                 packet_send();
1139                         }
1140                 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1141                         /*
1142                          * Normal successful read, and no escape character.
1143                          * Just append the data to buffer.
1144                          */
1145                         buffer_append(&stdin_buffer, buf, len);
1146                 } else {
1147                         /*
1148                          * Normal, successful read.  But we have an escape character
1149                          * and have to process the characters one by one.
1150                          */
1151                         if (process_escapes(NULL, &stdin_buffer,
1152                             &stdout_buffer, &stderr_buffer, buf, len) == -1)
1153                                 return;
1154                 }
1155         }
1156 }
1157
1158 static void
1159 client_process_output(fd_set *writeset)
1160 {
1161         int len;
1162         char buf[100];
1163
1164         /* Write buffered output to stdout. */
1165         if (FD_ISSET(fileno(stdout), writeset)) {
1166                 /* Write as much data as possible. */
1167                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1168                     buffer_len(&stdout_buffer));
1169                 if (len <= 0) {
1170                         if (errno == EINTR || errno == EAGAIN)
1171                                 len = 0;
1172                         else {
1173                                 /*
1174                                  * An error or EOF was encountered.  Put an
1175                                  * error message to stderr buffer.
1176                                  */
1177                                 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1178                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1179                                 quit_pending = 1;
1180                                 return;
1181                         }
1182                 }
1183                 /* Consume printed data from the buffer. */
1184                 buffer_consume(&stdout_buffer, len);
1185                 stdout_bytes += len;
1186         }
1187         /* Write buffered output to stderr. */
1188         if (FD_ISSET(fileno(stderr), writeset)) {
1189                 /* Write as much data as possible. */
1190                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1191                     buffer_len(&stderr_buffer));
1192                 if (len <= 0) {
1193                         if (errno == EINTR || errno == EAGAIN)
1194                                 len = 0;
1195                         else {
1196                                 /* EOF or error, but can't even print error message. */
1197                                 quit_pending = 1;
1198                                 return;
1199                         }
1200                 }
1201                 /* Consume printed characters from the buffer. */
1202                 buffer_consume(&stderr_buffer, len);
1203                 stderr_bytes += len;
1204         }
1205 }
1206
1207 /*
1208  * Get packets from the connection input buffer, and process them as long as
1209  * there are packets available.
1210  *
1211  * Any unknown packets received during the actual
1212  * session cause the session to terminate.  This is
1213  * intended to make debugging easier since no
1214  * confirmations are sent.  Any compatible protocol
1215  * extensions must be negotiated during the
1216  * preparatory phase.
1217  */
1218
1219 static void
1220 client_process_buffered_input_packets(void)
1221 {
1222         dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1223 }
1224
1225 /* scan buf[] for '~' before sending data to the peer */
1226
1227 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1228 void *
1229 client_new_escape_filter_ctx(int escape_char)
1230 {
1231         struct escape_filter_ctx *ret;
1232
1233         ret = xmalloc(sizeof(*ret));
1234         ret->escape_pending = 0;
1235         ret->escape_char = escape_char;
1236         return (void *)ret;
1237 }
1238
1239 int
1240 client_simple_escape_filter(Channel *c, char *buf, int len)
1241 {
1242         if (c->extended_usage != CHAN_EXTENDED_WRITE)
1243                 return 0;
1244
1245         return process_escapes(c, &c->input, &c->output, &c->extended,
1246             buf, len);
1247 }
1248
1249 static void
1250 client_channel_closed(int id, void *arg)
1251 {
1252         channel_cancel_cleanup(id);
1253         session_closed = 1;
1254         leave_raw_mode();
1255 }
1256
1257 /*
1258  * Implements the interactive session with the server.  This is called after
1259  * the user has been authenticated, and a command has been started on the
1260  * remote host.  If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1261  * used as an escape character for terminating or suspending the session.
1262  */
1263
1264 int
1265 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1266 {
1267         fd_set *readset = NULL, *writeset = NULL;
1268         double start_time, total_time;
1269         int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1270         u_int nalloc = 0;
1271         char buf[100];
1272
1273         debug("Entering interactive session.");
1274
1275         start_time = get_current_time();
1276
1277         /* Initialize variables. */
1278         escape_pending1 = 0;
1279         last_was_cr = 1;
1280         exit_status = -1;
1281         stdin_eof = 0;
1282         buffer_high = 64 * 1024;
1283         connection_in = packet_get_connection_in();
1284         connection_out = packet_get_connection_out();
1285         max_fd = MAX(connection_in, connection_out);
1286         if (muxserver_sock != -1)
1287                 max_fd = MAX(max_fd, muxserver_sock);
1288
1289         if (!compat20) {
1290                 /* enable nonblocking unless tty */
1291                 if (!isatty(fileno(stdin)))
1292                         set_nonblock(fileno(stdin));
1293                 if (!isatty(fileno(stdout)))
1294                         set_nonblock(fileno(stdout));
1295                 if (!isatty(fileno(stderr)))
1296                         set_nonblock(fileno(stderr));
1297                 max_fd = MAX(max_fd, fileno(stdin));
1298                 max_fd = MAX(max_fd, fileno(stdout));
1299                 max_fd = MAX(max_fd, fileno(stderr));
1300         }
1301         stdin_bytes = 0;
1302         stdout_bytes = 0;
1303         stderr_bytes = 0;
1304         quit_pending = 0;
1305         escape_char1 = escape_char_arg;
1306
1307         /* Initialize buffers. */
1308         buffer_init(&stdin_buffer);
1309         buffer_init(&stdout_buffer);
1310         buffer_init(&stderr_buffer);
1311
1312         client_init_dispatch();
1313
1314         /*
1315          * Set signal handlers, (e.g. to restore non-blocking mode)
1316          * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1317          */
1318         if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1319                 signal(SIGHUP, signal_handler);
1320         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1321                 signal(SIGINT, signal_handler);
1322         if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1323                 signal(SIGQUIT, signal_handler);
1324         if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1325                 signal(SIGTERM, signal_handler);
1326         signal(SIGWINCH, window_change_handler);
1327
1328         if (have_pty)
1329                 enter_raw_mode();
1330
1331         if (compat20) {
1332                 session_ident = ssh2_chan_id;
1333                 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1334                         channel_register_filter(session_ident,
1335                             client_simple_escape_filter, NULL,
1336                             client_new_escape_filter_ctx(escape_char_arg));
1337                 if (session_ident != -1)
1338                         channel_register_cleanup(session_ident,
1339                             client_channel_closed, 0);
1340         } else {
1341                 /* Check if we should immediately send eof on stdin. */
1342                 client_check_initial_eof_on_stdin();
1343         }
1344
1345         /* Main loop of the client for the interactive session mode. */
1346         while (!quit_pending) {
1347
1348                 /* Process buffered packets sent by the server. */
1349                 client_process_buffered_input_packets();
1350
1351                 if (compat20 && session_closed && !channel_still_open())
1352                         break;
1353
1354                 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1355
1356                 if (rekeying) {
1357                         debug("rekeying in progress");
1358                 } else {
1359                         /*
1360                          * Make packets of buffered stdin data, and buffer
1361                          * them for sending to the server.
1362                          */
1363                         if (!compat20)
1364                                 client_make_packets_from_stdin_data();
1365
1366                         /*
1367                          * Make packets from buffered channel data, and
1368                          * enqueue them for sending to the server.
1369                          */
1370                         if (packet_not_very_much_data_to_write())
1371                                 channel_output_poll();
1372
1373                         /*
1374                          * Check if the window size has changed, and buffer a
1375                          * message about it to the server if so.
1376                          */
1377                         client_check_window_change();
1378
1379                         if (quit_pending)
1380                                 break;
1381                 }
1382                 /*
1383                  * Wait until we have something to do (something becomes
1384                  * available on one of the descriptors).
1385                  */
1386                 max_fd2 = max_fd;
1387                 client_wait_until_can_do_something(&readset, &writeset,
1388                     &max_fd2, &nalloc, rekeying);
1389
1390                 if (quit_pending)
1391                         break;
1392
1393                 /* Do channel operations unless rekeying in progress. */
1394                 if (!rekeying) {
1395                         channel_after_select(readset, writeset);
1396                         if (need_rekeying || packet_need_rekeying()) {
1397                                 debug("need rekeying");
1398                                 xxx_kex->done = 0;
1399                                 kex_send_kexinit(xxx_kex);
1400                                 need_rekeying = 0;
1401                         }
1402                 }
1403
1404                 /* Buffer input from the connection.  */
1405                 client_process_net_input(readset);
1406
1407                 /* Accept control connections.  */
1408                 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1409                         if (muxserver_accept_control())
1410                                 quit_pending = 1;
1411                 }
1412
1413                 if (quit_pending)
1414                         break;
1415
1416                 if (!compat20) {
1417                         /* Buffer data from stdin */
1418                         client_process_input(readset);
1419                         /*
1420                          * Process output to stdout and stderr.  Output to
1421                          * the connection is processed elsewhere (above).
1422                          */
1423                         client_process_output(writeset);
1424                 }
1425
1426                 /* Send as much buffered packet data as possible to the sender. */
1427                 if (FD_ISSET(connection_out, writeset))
1428                         packet_write_poll();
1429         }
1430         if (readset)
1431                 xfree(readset);
1432         if (writeset)
1433                 xfree(writeset);
1434
1435         /* Terminate the session. */
1436
1437         /* Stop watching for window change. */
1438         signal(SIGWINCH, SIG_DFL);
1439
1440         channel_free_all();
1441
1442         if (have_pty)
1443                 leave_raw_mode();
1444
1445         /* restore blocking io */
1446         if (!isatty(fileno(stdin)))
1447                 unset_nonblock(fileno(stdin));
1448         if (!isatty(fileno(stdout)))
1449                 unset_nonblock(fileno(stdout));
1450         if (!isatty(fileno(stderr)))
1451                 unset_nonblock(fileno(stderr));
1452
1453         /*
1454          * If there was no shell or command requested, there will be no remote
1455          * exit status to be returned.  In that case, clear error code if the
1456          * connection was deliberately terminated at this end.
1457          */
1458         if (no_shell_flag && received_signal == SIGTERM) {
1459                 received_signal = 0;
1460                 exit_status = 0;
1461         }
1462
1463         if (received_signal)
1464                 fatal("Killed by signal %d.", (int) received_signal);
1465
1466         /*
1467          * In interactive mode (with pseudo tty) display a message indicating
1468          * that the connection has been closed.
1469          */
1470         if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1471                 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1472                 buffer_append(&stderr_buffer, buf, strlen(buf));
1473         }
1474
1475         /* Output any buffered data for stdout. */
1476         while (buffer_len(&stdout_buffer) > 0) {
1477                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1478                     buffer_len(&stdout_buffer));
1479                 if (len <= 0) {
1480                         error("Write failed flushing stdout buffer.");
1481                         break;
1482                 }
1483                 buffer_consume(&stdout_buffer, len);
1484                 stdout_bytes += len;
1485         }
1486
1487         /* Output any buffered data for stderr. */
1488         while (buffer_len(&stderr_buffer) > 0) {
1489                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1490                     buffer_len(&stderr_buffer));
1491                 if (len <= 0) {
1492                         error("Write failed flushing stderr buffer.");
1493                         break;
1494                 }
1495                 buffer_consume(&stderr_buffer, len);
1496                 stderr_bytes += len;
1497         }
1498
1499         /* Clear and free any buffers. */
1500         memset(buf, 0, sizeof(buf));
1501         buffer_free(&stdin_buffer);
1502         buffer_free(&stdout_buffer);
1503         buffer_free(&stderr_buffer);
1504
1505         /* Report bytes transferred, and transfer rates. */
1506         total_time = get_current_time() - start_time;
1507         debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1508             stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1509         if (total_time > 0)
1510                 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1511                     stdin_bytes / total_time, stdout_bytes / total_time,
1512                     stderr_bytes / total_time);
1513
1514         /* Return the exit status of the program. */
1515         debug("Exit status %d", exit_status);
1516         return exit_status;
1517 }
1518
1519 /*********/
1520
1521 static void
1522 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1523 {
1524         u_int data_len;
1525         char *data = packet_get_string(&data_len);
1526         packet_check_eom();
1527         buffer_append(&stdout_buffer, data, data_len);
1528         memset(data, 0, data_len);
1529         xfree(data);
1530 }
1531 static void
1532 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1533 {
1534         u_int data_len;
1535         char *data = packet_get_string(&data_len);
1536         packet_check_eom();
1537         buffer_append(&stderr_buffer, data, data_len);
1538         memset(data, 0, data_len);
1539         xfree(data);
1540 }
1541 static void
1542 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1543 {
1544         exit_status = packet_get_int();
1545         packet_check_eom();
1546         /* Acknowledge the exit. */
1547         packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1548         packet_send();
1549         /*
1550          * Must wait for packet to be sent since we are
1551          * exiting the loop.
1552          */
1553         packet_write_wait();
1554         /* Flag that we want to exit. */
1555         quit_pending = 1;
1556 }
1557 static void
1558 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1559 {
1560         Channel *c = NULL;
1561         int remote_id, sock;
1562
1563         /* Read the remote channel number from the message. */
1564         remote_id = packet_get_int();
1565         packet_check_eom();
1566
1567         /*
1568          * Get a connection to the local authentication agent (this may again
1569          * get forwarded).
1570          */
1571         sock = ssh_get_authentication_socket();
1572
1573         /*
1574          * If we could not connect the agent, send an error message back to
1575          * the server. This should never happen unless the agent dies,
1576          * because authentication forwarding is only enabled if we have an
1577          * agent.
1578          */
1579         if (sock >= 0) {
1580                 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1581                     -1, 0, 0, 0, "authentication agent connection", 1);
1582                 c->remote_id = remote_id;
1583                 c->force_drain = 1;
1584         }
1585         if (c == NULL) {
1586                 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1587                 packet_put_int(remote_id);
1588         } else {
1589                 /* Send a confirmation to the remote host. */
1590                 debug("Forwarding authentication connection.");
1591                 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1592                 packet_put_int(remote_id);
1593                 packet_put_int(c->self);
1594         }
1595         packet_send();
1596 }
1597
1598 static Channel *
1599 client_request_forwarded_tcpip(const char *request_type, int rchan)
1600 {
1601         Channel *c = NULL;
1602         char *listen_address, *originator_address;
1603         int listen_port, originator_port;
1604
1605         /* Get rest of the packet */
1606         listen_address = packet_get_string(NULL);
1607         listen_port = packet_get_int();
1608         originator_address = packet_get_string(NULL);
1609         originator_port = packet_get_int();
1610         packet_check_eom();
1611
1612         debug("client_request_forwarded_tcpip: listen %s port %d, "
1613             "originator %s port %d", listen_address, listen_port,
1614             originator_address, originator_port);
1615
1616         c = channel_connect_by_listen_address(listen_port,
1617             "forwarded-tcpip", originator_address);
1618
1619         xfree(originator_address);
1620         xfree(listen_address);
1621         return c;
1622 }
1623
1624 static Channel *
1625 client_request_x11(const char *request_type, int rchan)
1626 {
1627         Channel *c = NULL;
1628         char *originator;
1629         int originator_port;
1630         int sock;
1631
1632         if (!options.forward_x11) {
1633                 error("Warning: ssh server tried X11 forwarding.");
1634                 error("Warning: this is probably a break-in attempt by a malicious server.");
1635                 return NULL;
1636         }
1637         originator = packet_get_string(NULL);
1638         if (datafellows & SSH_BUG_X11FWD) {
1639                 debug2("buggy server: x11 request w/o originator_port");
1640                 originator_port = 0;
1641         } else {
1642                 originator_port = packet_get_int();
1643         }
1644         packet_check_eom();
1645         /* XXX check permission */
1646         debug("client_request_x11: request from %s %d", originator,
1647             originator_port);
1648         xfree(originator);
1649         sock = x11_connect_display();
1650         if (sock < 0)
1651                 return NULL;
1652         c = channel_new("x11",
1653             SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1654             CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1655         c->force_drain = 1;
1656         return c;
1657 }
1658
1659 static Channel *
1660 client_request_agent(const char *request_type, int rchan)
1661 {
1662         Channel *c = NULL;
1663         int sock;
1664
1665         if (!options.forward_agent) {
1666                 error("Warning: ssh server tried agent forwarding.");
1667                 error("Warning: this is probably a break-in attempt by a malicious server.");
1668                 return NULL;
1669         }
1670         sock = ssh_get_authentication_socket();
1671         if (sock < 0)
1672                 return NULL;
1673         c = channel_new("authentication agent connection",
1674             SSH_CHANNEL_OPEN, sock, sock, -1,
1675             CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1676             "authentication agent connection", 1);
1677         c->force_drain = 1;
1678         return c;
1679 }
1680
1681 int
1682 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1683 {
1684         Channel *c;
1685         int fd;
1686
1687         if (tun_mode == SSH_TUNMODE_NO)
1688                 return 0;
1689
1690         if (!compat20) {
1691                 error("Tunnel forwarding is not support for protocol 1");
1692                 return -1;
1693         }
1694
1695         debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1696
1697         /* Open local tunnel device */
1698         if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1699                 error("Tunnel device open failed.");
1700                 return -1;
1701         }
1702
1703         c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1704             CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1705         c->datagram = 1;
1706
1707 #if defined(SSH_TUN_FILTER)
1708         if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1709                 channel_register_filter(c->self, sys_tun_infilter,
1710                     sys_tun_outfilter);
1711 #endif
1712
1713         packet_start(SSH2_MSG_CHANNEL_OPEN);
1714         packet_put_cstring("tun@openssh.com");
1715         packet_put_int(c->self);
1716         packet_put_int(c->local_window_max);
1717         packet_put_int(c->local_maxpacket);
1718         packet_put_int(tun_mode);
1719         packet_put_int(remote_tun);
1720         packet_send();
1721
1722         return 0;
1723 }
1724
1725 /* XXXX move to generic input handler */
1726 static void
1727 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1728 {
1729         Channel *c = NULL;
1730         char *ctype;
1731         int rchan;
1732         u_int rmaxpack, rwindow, len;
1733
1734         ctype = packet_get_string(&len);
1735         rchan = packet_get_int();
1736         rwindow = packet_get_int();
1737         rmaxpack = packet_get_int();
1738
1739         debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1740             ctype, rchan, rwindow, rmaxpack);
1741
1742         if (strcmp(ctype, "forwarded-tcpip") == 0) {
1743                 c = client_request_forwarded_tcpip(ctype, rchan);
1744         } else if (strcmp(ctype, "x11") == 0) {
1745                 c = client_request_x11(ctype, rchan);
1746         } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1747                 c = client_request_agent(ctype, rchan);
1748         }
1749 /* XXX duplicate : */
1750         if (c != NULL) {
1751                 debug("confirm %s", ctype);
1752                 c->remote_id = rchan;
1753                 c->remote_window = rwindow;
1754                 c->remote_maxpacket = rmaxpack;
1755                 if (c->type != SSH_CHANNEL_CONNECTING) {
1756                         packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1757                         packet_put_int(c->remote_id);
1758                         packet_put_int(c->self);
1759                         packet_put_int(c->local_window);
1760                         packet_put_int(c->local_maxpacket);
1761                         packet_send();
1762                 }
1763         } else {
1764                 debug("failure %s", ctype);
1765                 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1766                 packet_put_int(rchan);
1767                 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1768                 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1769                         packet_put_cstring("open failed");
1770                         packet_put_cstring("");
1771                 }
1772                 packet_send();
1773         }
1774         xfree(ctype);
1775 }
1776 static void
1777 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1778 {
1779         Channel *c = NULL;
1780         int exitval, id, reply, success = 0;
1781         char *rtype;
1782
1783         id = packet_get_int();
1784         rtype = packet_get_string(NULL);
1785         reply = packet_get_char();
1786
1787         debug("client_input_channel_req: channel %d rtype %s reply %d",
1788             id, rtype, reply);
1789
1790         if (id == -1) {
1791                 error("client_input_channel_req: request for channel -1");
1792         } else if ((c = channel_lookup(id)) == NULL) {
1793                 error("client_input_channel_req: channel %d: unknown channel", id);
1794         } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1795                 packet_check_eom();
1796                 chan_rcvd_eow(c);
1797         } else if (strcmp(rtype, "exit-status") == 0) {
1798                 exitval = packet_get_int();
1799                 if (id == session_ident) {
1800                         success = 1;
1801                         exit_status = exitval;
1802                 } else if (c->ctl_fd == -1) {
1803                         error("client_input_channel_req: unexpected channel %d",
1804                             session_ident);
1805                 } else {
1806                         atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1807                         success = 1;
1808                 }
1809                 packet_check_eom();
1810         }
1811         if (reply) {
1812                 packet_start(success ?
1813                     SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1814                 packet_put_int(id);
1815                 packet_send();
1816         }
1817         xfree(rtype);
1818 }
1819 static void
1820 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1821 {
1822         char *rtype;
1823         int want_reply;
1824         int success = 0;
1825
1826         rtype = packet_get_string(NULL);
1827         want_reply = packet_get_char();
1828         debug("client_input_global_request: rtype %s want_reply %d",
1829             rtype, want_reply);
1830         if (want_reply) {
1831                 packet_start(success ?
1832                     SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1833                 packet_send();
1834                 packet_write_wait();
1835         }
1836         xfree(rtype);
1837 }
1838
1839 void
1840 client_session2_setup(int id, int want_tty, int want_subsystem,
1841     const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1842 {
1843         int len;
1844         Channel *c = NULL;
1845
1846         debug2("%s: id %d", __func__, id);
1847
1848         if ((c = channel_lookup(id)) == NULL)
1849                 fatal("client_session2_setup: channel %d: unknown channel", id);
1850
1851         if (want_tty) {
1852                 struct winsize ws;
1853
1854                 /* Store window size in the packet. */
1855                 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1856                         memset(&ws, 0, sizeof(ws));
1857
1858                 channel_request_start(id, "pty-req", 1);
1859                 client_expect_confirm(id, "PTY allocation", 0);
1860                 packet_put_cstring(term != NULL ? term : "");
1861                 packet_put_int((u_int)ws.ws_col);
1862                 packet_put_int((u_int)ws.ws_row);
1863                 packet_put_int((u_int)ws.ws_xpixel);
1864                 packet_put_int((u_int)ws.ws_ypixel);
1865                 if (tiop == NULL)
1866                         tiop = get_saved_tio();
1867                 tty_make_modes(-1, tiop);
1868                 packet_send();
1869                 /* XXX wait for reply */
1870                 c->client_tty = 1;
1871         }
1872
1873         /* Transfer any environment variables from client to server */
1874         if (options.num_send_env != 0 && env != NULL) {
1875                 int i, j, matched;
1876                 char *name, *val;
1877
1878                 debug("Sending environment.");
1879                 for (i = 0; env[i] != NULL; i++) {
1880                         /* Split */
1881                         name = xstrdup(env[i]);
1882                         if ((val = strchr(name, '=')) == NULL) {
1883                                 xfree(name);
1884                                 continue;
1885                         }
1886                         *val++ = '\0';
1887
1888                         matched = 0;
1889                         for (j = 0; j < options.num_send_env; j++) {
1890                                 if (match_pattern(name, options.send_env[j])) {
1891                                         matched = 1;
1892                                         break;
1893                                 }
1894                         }
1895                         if (!matched) {
1896                                 debug3("Ignored env %s", name);
1897                                 xfree(name);
1898                                 continue;
1899                         }
1900
1901                         debug("Sending env %s = %s", name, val);
1902                         channel_request_start(id, "env", 0);
1903                         packet_put_cstring(name);
1904                         packet_put_cstring(val);
1905                         packet_send();
1906                         xfree(name);
1907                 }
1908         }
1909
1910         len = buffer_len(cmd);
1911         if (len > 0) {
1912                 if (len > 900)
1913                         len = 900;
1914                 if (want_subsystem) {
1915                         debug("Sending subsystem: %.*s",
1916                             len, (u_char*)buffer_ptr(cmd));
1917                         channel_request_start(id, "subsystem", 1);
1918                         client_expect_confirm(id, "subsystem", 1);
1919                 } else {
1920                         debug("Sending command: %.*s",
1921                             len, (u_char*)buffer_ptr(cmd));
1922                         channel_request_start(id, "exec", 1);
1923                         client_expect_confirm(id, "exec", 1);
1924                 }
1925                 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1926                 packet_send();
1927         } else {
1928                 channel_request_start(id, "shell", 1);
1929                 client_expect_confirm(id, "shell", 1);
1930                 packet_send();
1931         }
1932 }
1933
1934 static void
1935 client_init_dispatch_20(void)
1936 {
1937         dispatch_init(&dispatch_protocol_error);
1938
1939         dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1940         dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1941         dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1942         dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1943         dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1944         dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1945         dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1946         dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1947         dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1948         dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
1949         dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1950         dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1951
1952         /* rekeying */
1953         dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1954
1955         /* global request reply messages */
1956         dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1957         dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1958 }
1959 static void
1960 client_init_dispatch_13(void)
1961 {
1962         dispatch_init(NULL);
1963         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1964         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1965         dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1966         dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1967         dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1968         dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1969         dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1970         dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1971         dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1972
1973         dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1974             &client_input_agent_open : &deny_input_open);
1975         dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1976             &x11_input_open : &deny_input_open);
1977 }
1978 static void
1979 client_init_dispatch_15(void)
1980 {
1981         client_init_dispatch_13();
1982         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1983         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1984 }
1985 static void
1986 client_init_dispatch(void)
1987 {
1988         if (compat20)
1989                 client_init_dispatch_20();
1990         else if (compat13)
1991                 client_init_dispatch_13();
1992         else
1993                 client_init_dispatch_15();
1994 }
1995
1996 /* client specific fatal cleanup */
1997 void
1998 cleanup_exit(int i)
1999 {
2000         leave_raw_mode();
2001         leave_non_blocking();
2002         if (options.control_path != NULL && muxserver_sock != -1)
2003                 unlink(options.control_path);
2004         _exit(i);
2005 }