clientloop.c

   1 /* $OpenBSD: clientloop.c,v 1.218 2010/01/28 00:21:18 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 /* Common data for the client loop code. */
 149 volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
 150 static int escape_char1;        /* Escape character. (proto1 only) */
 151 static int escape_pending1;     /* Last character was an escape (proto1 only) */
 152 static int last_was_cr;         /* Last character was a newline. */
 153 static int exit_status;         /* Used to store the command exit status. */
 154 static int stdin_eof;           /* EOF has been encountered on stderr. */
 155 static Buffer stdin_buffer;     /* Buffer for stdin data. */
 156 static Buffer stdout_buffer;    /* Buffer for stdout data. */
 157 static Buffer stderr_buffer;    /* Buffer for stderr data. */
 158 static u_int buffer_high;/* Soft max buffer size. */
 159 static int connection_in;       /* Connection to server (input). */
 160 static int connection_out;      /* Connection to server (output). */
 161 static int need_rekeying;       /* Set to non-zero if rekeying is requested. */
 162 static int session_closed = 0;  /* In SSH2: login session closed. */
 163
 164 static void client_init_dispatch(void);
 165 int     session_ident = -1;
 166
 167 int     session_resumed = 0;
 168
 169 /* Track escape per proto2 channel */
 170 struct escape_filter_ctx {
 171         int escape_pending;
 172         int escape_char;
 173 };
 174
 175 /* Context for channel confirmation replies */
 176 struct channel_reply_ctx {
 177         const char *request_type;
 178         int id, do_close;
 179 };
 180
 181 /* Global request success/failure callbacks */
 182 struct global_confirm {
 183         TAILQ_ENTRY(global_confirm) entry;
 184         global_confirm_cb *cb;
 185         void *ctx;
 186         int ref_count;
 187 };
 188 TAILQ_HEAD(global_confirms, global_confirm);
 189 static struct global_confirms global_confirms =
 190     TAILQ_HEAD_INITIALIZER(global_confirms);
 191
 192 /*XXX*/
 193 extern Kex *xxx_kex;
 194
 195 void ssh_process_session2_setup(int, int, int, Buffer *);
 196
 197 /* Restores stdin to blocking mode. */
 198
 199 static void
 200 leave_non_blocking(void)
 201 {
 202         if (in_non_blocking_mode) {
 203                 unset_nonblock(fileno(stdin));
 204                 in_non_blocking_mode = 0;
 205         }
 206 }
 207
 208 /* Puts stdin terminal in non-blocking mode. */
 209
 210 static void
 211 enter_non_blocking(void)
 212 {
 213         in_non_blocking_mode = 1;
 214         set_nonblock(fileno(stdin));
 215 }
 216
 217 /*
 218  * Signal handler for the window change signal (SIGWINCH).  This just sets a
 219  * flag indicating that the window has changed.
 220  */
 221 /*ARGSUSED */
 222 static void
 223 window_change_handler(int sig)
 224 {
 225         received_window_change_signal = 1;
 226         signal(SIGWINCH, window_change_handler);
 227 }
 228
 229 /*
 230  * Signal handler for signals that cause the program to terminate.  These
 231  * signals must be trapped to restore terminal modes.
 232  */
 233 /*ARGSUSED */
 234 static void
 235 signal_handler(int sig)
 236 {
 237         received_signal = sig;
 238         quit_pending = 1;
 239 }
 240
 241 /*
 242  * Returns current time in seconds from Jan 1, 1970 with the maximum
 243  * available resolution.
 244  */
 245
 246 static double
 247 get_current_time(void)
 248 {
 249         struct timeval tv;
 250         gettimeofday(&tv, NULL);
 251         return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
 252 }
 253
 254 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
 255 void
 256 client_x11_get_proto(const char *display, const char *xauth_path,
 257     u_int trusted, char **_proto, char **_data)
 258 {
 259         char cmd[1024];
 260         char line[512];
 261         char xdisplay[512];
 262         static char proto[512], data[512];
 263         FILE *f;
 264         int got_data = 0, generated = 0, do_unlink = 0, i;
 265         char *xauthdir, *xauthfile;
 266         struct stat st;
 267
 268         xauthdir = xauthfile = NULL;
 269         *_proto = proto;
 270         *_data = data;
 271         proto[0] = data[0] = '\0';
 272
 273         if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
 274                 debug("No xauth program.");
 275         } else {
 276                 if (display == NULL) {
 277                         debug("x11_get_proto: DISPLAY not set");
 278                         return;
 279                 }
 280                 /*
 281                  * Handle FamilyLocal case where $DISPLAY does
 282                  * not match an authorization entry.  For this we
 283                  * just try "xauth list unix:displaynum.screennum".
 284                  * XXX: "localhost" match to determine FamilyLocal
 285                  *      is not perfect.
 286                  */
 287                 if (strncmp(display, "localhost:", 10) == 0) {
 288                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
 289                             display + 10);
 290                         display = xdisplay;
 291                 }
 292                 if (trusted == 0) {
 293                         xauthdir = xmalloc(MAXPATHLEN);
 294                         xauthfile = xmalloc(MAXPATHLEN);
 295                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
 296                         if (mkdtemp(xauthdir) != NULL) {
 297                                 do_unlink = 1;
 298                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
 299                                     xauthdir);
 300                                 snprintf(cmd, sizeof(cmd),
 301                                     "%s -f %s generate %s " SSH_X11_PROTO
 302                                     " untrusted timeout 1200 2>" _PATH_DEVNULL,
 303                                     xauth_path, xauthfile, display);
 304                                 debug2("x11_get_proto: %s", cmd);
 305                                 if (system(cmd) == 0)
 306                                         generated = 1;
 307                         }
 308                 }
 309
 310                 /*
 311                  * When in untrusted mode, we read the cookie only if it was
 312                  * successfully generated as an untrusted one in the step
 313                  * above.
 314                  */
 315                 if (trusted || generated) {
 316                         snprintf(cmd, sizeof(cmd),
 317                             "%s %s%s list %s 2>" _PATH_DEVNULL,
 318                             xauth_path,
 319                             generated ? "-f " : "" ,
 320                             generated ? xauthfile : "",
 321                             display);
 322                         debug2("x11_get_proto: %s", cmd);
 323                         f = popen(cmd, "r");
 324                         if (f && fgets(line, sizeof(line), f) &&
 325                             sscanf(line, "%*s %511s %511s", proto, data) == 2)
 326                                 got_data = 1;
 327                         if (f)
 328                                 pclose(f);
 329                 } else
 330                         error("Warning: untrusted X11 forwarding setup failed: "
 331                             "xauth key data not generated");
 332         }
 333
 334         if (do_unlink) {
 335                 unlink(xauthfile);
 336                 rmdir(xauthdir);
 337         }
 338         if (xauthdir)
 339                 xfree(xauthdir);
 340         if (xauthfile)
 341                 xfree(xauthfile);
 342
 343         /*
 344          * If we didn't get authentication data, just make up some
 345          * data.  The forwarding code will check the validity of the
 346          * response anyway, and substitute this data.  The X11
 347          * server, however, will ignore this fake data and use
 348          * whatever authentication mechanisms it was using otherwise
 349          * for the local connection.
 350          */
 351         if (!got_data) {
 352                 u_int32_t rnd = 0;
 353
 354                 logit("Warning: No xauth data; "
 355                     "using fake authentication data for X11 forwarding.");
 356                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
 357                 for (i = 0; i < 16; i++) {
 358                         if (i % 4 == 0)
 359                                 rnd = arc4random();
 360                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
 361                             rnd & 0xff);
 362                         rnd >>= 8;
 363                 }
 364         }
 365 }
 366
 367 /*
 368  * This is called when the interactive is entered.  This checks if there is
 369  * an EOF coming on stdin.  We must check this explicitly, as select() does
 370  * not appear to wake up when redirecting from /dev/null.
 371  */
 372
 373 static void
 374 client_check_initial_eof_on_stdin(void)
 375 {
 376         int len;
 377         char buf[1];
 378
 379         /*
 380          * If standard input is to be "redirected from /dev/null", we simply
 381          * mark that we have seen an EOF and send an EOF message to the
 382          * server. Otherwise, we try to read a single character; it appears
 383          * that for some files, such /dev/null, select() never wakes up for
 384          * read for this descriptor, which means that we never get EOF.  This
 385          * way we will get the EOF if stdin comes from /dev/null or similar.
 386          */
 387         if (stdin_null_flag) {
 388                 /* Fake EOF on stdin. */
 389                 debug("Sending eof.");
 390                 stdin_eof = 1;
 391                 packet_start(SSH_CMSG_EOF);
 392                 packet_send();
 393         } else {
 394                 enter_non_blocking();
 395
 396                 /* Check for immediate EOF on stdin. */
 397                 len = read(fileno(stdin), buf, 1);
 398                 if (len == 0) {
 399                         /*
 400                          * EOF.  Record that we have seen it and send
 401                          * EOF to server.
 402                          */
 403                         debug("Sending eof.");
 404                         stdin_eof = 1;
 405                         packet_start(SSH_CMSG_EOF);
 406                         packet_send();
 407                 } else if (len > 0) {
 408                         /*
 409                          * Got data.  We must store the data in the buffer,
 410                          * and also process it as an escape character if
 411                          * appropriate.
 412                          */
 413                         if ((u_char) buf[0] == escape_char1)
 414                                 escape_pending1 = 1;
 415                         else
 416                                 buffer_append(&stdin_buffer, buf, 1);
 417                 }
 418                 leave_non_blocking();
 419         }
 420 }
 421
 422
 423 /*
 424  * Make packets from buffered stdin data, and buffer them for sending to the
 425  * connection.
 426  */
 427
 428 static void
 429 client_make_packets_from_stdin_data(void)
 430 {
 431         u_int len;
 432
 433         /* Send buffered stdin data to the server. */
 434         while (buffer_len(&stdin_buffer) > 0 &&
 435             packet_not_very_much_data_to_write()) {
 436                 len = buffer_len(&stdin_buffer);
 437                 /* Keep the packets at reasonable size. */
 438                 if (len > packet_get_maxsize())
 439                         len = packet_get_maxsize();
 440                 packet_start(SSH_CMSG_STDIN_DATA);
 441                 packet_put_string(buffer_ptr(&stdin_buffer), len);
 442                 packet_send();
 443                 buffer_consume(&stdin_buffer, len);
 444                 /* If we have a pending EOF, send it now. */
 445                 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
 446                         packet_start(SSH_CMSG_EOF);
 447                         packet_send();
 448                 }
 449         }
 450 }
 451
 452 /*
 453  * Checks if the client window has changed, and sends a packet about it to
 454  * the server if so.  The actual change is detected elsewhere (by a software
 455  * interrupt on Unix); this just checks the flag and sends a message if
 456  * appropriate.
 457  */
 458
 459 static void
 460 client_check_window_change(void)
 461 {
 462         struct winsize ws;
 463
 464         if (! received_window_change_signal)
 465                 return;
 466         /** XXX race */
 467         received_window_change_signal = 0;
 468
 469         debug2("client_check_window_change: changed");
 470
 471         if (compat20) {
 472                 channel_send_window_changes();
 473         } else {
 474                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
 475                         return;
 476                 packet_start(SSH_CMSG_WINDOW_SIZE);
 477                 packet_put_int((u_int)ws.ws_row);
 478                 packet_put_int((u_int)ws.ws_col);
 479                 packet_put_int((u_int)ws.ws_xpixel);
 480                 packet_put_int((u_int)ws.ws_ypixel);
 481                 packet_send();
 482         }
 483 }
 484
 485 static void
 486 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
 487 {
 488         struct global_confirm *gc;
 489
 490         if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
 491                 return;
 492         if (gc->cb != NULL)
 493                 gc->cb(type, seq, gc->ctx);
 494         if (--gc->ref_count <= 0) {
 495                 TAILQ_REMOVE(&global_confirms, gc, entry);
 496                 bzero(gc, sizeof(*gc));
 497                 xfree(gc);
 498         }
 499
 500         packet_set_alive_timeouts(0);
 501 }
 502
 503 static void
 504 server_alive_check(void)
 505 {
 506         if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
 507                 logit("Timeout, server not responding.");
 508                 cleanup_exit(255);
 509         }
 510         packet_start(SSH2_MSG_GLOBAL_REQUEST);
 511         packet_put_cstring("keepalive@openssh.com");
 512         packet_put_char(1);     /* boolean: want reply */
 513         packet_send();
 514         /* Insert an empty placeholder to maintain ordering */
 515         client_register_global_confirm(NULL, NULL);
 516 }
 517
 518 /*
 519  * Waits until the client can do something (some data becomes available on
 520  * one of the file descriptors).
 521  */
 522 static void
 523 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
 524     int *maxfdp, u_int *nallocp, int rekeying)
 525 {
 526         struct timeval tv, *tvp;
 527         int ret;
 528
 529         /* Add any selections by the channel mechanism. */
 530         channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
 531
 532         if (!compat20) {
 533                 /* Read from the connection, unless our buffers are full. */
 534                 if (buffer_len(&stdout_buffer) < buffer_high &&
 535                     buffer_len(&stderr_buffer) < buffer_high &&
 536                     channel_not_very_much_buffered_data())
 537                         FD_SET(connection_in, *readsetp);
 538                 /*
 539                  * Read from stdin, unless we have seen EOF or have very much
 540                  * buffered data to send to the server.
 541                  */
 542                 if (!stdin_eof && packet_not_very_much_data_to_write())
 543                         FD_SET(fileno(stdin), *readsetp);
 544
 545                 /* Select stdout/stderr if have data in buffer. */
 546                 if (buffer_len(&stdout_buffer) > 0)
 547                         FD_SET(fileno(stdout), *writesetp);
 548                 if (buffer_len(&stderr_buffer) > 0)
 549                         FD_SET(fileno(stderr), *writesetp);
 550         } else {
 551                 /* channel_prepare_select could have closed the last channel */
 552                 if (session_closed && !channel_still_open() &&
 553                     !packet_have_data_to_write()) {
 554                         /* clear mask since we did not call select() */
 555                         memset(*readsetp, 0, *nallocp);
 556                         memset(*writesetp, 0, *nallocp);
 557                         return;
 558                 } else {
 559                         FD_SET(connection_in, *readsetp);
 560                 }
 561         }
 562
 563         /* Select server connection if have data to write to the server. */
 564         if (packet_have_data_to_write())
 565                 FD_SET(connection_out, *writesetp);
 566
 567         /*
 568          * Wait for something to happen.  This will suspend the process until
 569          * some selected descriptor can be read, written, or has some other
 570          * event pending.
 571          */
 572
 573         if (options.server_alive_interval == 0 || !compat20)
 574                 tvp = NULL;
 575         else {
 576                 tv.tv_sec = options.server_alive_interval;
 577                 tv.tv_usec = 0;
 578                 tvp = &tv;
 579         }
 580         ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
 581         if (ret < 0) {
 582                 char buf[100];
 583
 584                 /*
 585                  * We have to clear the select masks, because we return.
 586                  * We have to return, because the mainloop checks for the flags
 587                  * set by the signal handlers.
 588                  */
 589                 memset(*readsetp, 0, *nallocp);
 590                 memset(*writesetp, 0, *nallocp);
 591
 592                 if (errno == EINTR)
 593                         return;
 594                 /* Note: we might still have data in the buffers. */
 595                 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
 596                 buffer_append(&stderr_buffer, buf, strlen(buf));
 597                 quit_pending = 1;
 598         } else if (ret == 0)
 599                 server_alive_check();
 600 }
 601
 602 static void
 603 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
 604 {
 605         /* Flush stdout and stderr buffers. */
 606         if (buffer_len(bout) > 0)
 607                 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
 608                     buffer_len(bout));
 609         if (buffer_len(berr) > 0)
 610                 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
 611                     buffer_len(berr));
 612
 613         leave_raw_mode(force_tty_flag);
 614
 615         /*
 616          * Free (and clear) the buffer to reduce the amount of data that gets
 617          * written to swap.
 618          */
 619         buffer_free(bin);
 620         buffer_free(bout);
 621         buffer_free(berr);
 622
 623         /* Send the suspend signal to the program itself. */
 624         kill(getpid(), SIGTSTP);
 625
 626         /* Reset window sizes in case they have changed */
 627         received_window_change_signal = 1;
 628
 629         /* OK, we have been continued by the user. Reinitialize buffers. */
 630         buffer_init(bin);
 631         buffer_init(bout);
 632         buffer_init(berr);
 633
 634         enter_raw_mode(force_tty_flag);
 635 }
 636
 637 static void
 638 client_process_net_input(fd_set *readset)
 639 {
 640         int len, cont = 0;
 641         char buf[SSH_IOBUFSZ];
 642
 643         /*
 644          * Read input from the server, and add any such data to the buffer of
 645          * the packet subsystem.
 646          */
 647         if (FD_ISSET(connection_in, readset)) {
 648                 /* Read as much as possible. */
 649                 len = roaming_read(connection_in, buf, sizeof(buf), &cont);
 650                 if (len == 0 && cont == 0) {
 651                         /*
 652                          * Received EOF.  The remote host has closed the
 653                          * connection.
 654                          */
 655                         snprintf(buf, sizeof buf,
 656                             "Connection to %.300s closed by remote host.\r\n",
 657                             host);
 658                         buffer_append(&stderr_buffer, buf, strlen(buf));
 659                         quit_pending = 1;
 660                         return;
 661                 }
 662                 /*
 663                  * There is a kernel bug on Solaris that causes select to
 664                  * sometimes wake up even though there is no data available.
 665                  */
 666                 if (len < 0 &&
 667                     (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
 668                         len = 0;
 669
 670                 if (len < 0) {
 671                         /*
 672                          * An error has encountered.  Perhaps there is a
 673                          * network problem.
 674                          */
 675                         snprintf(buf, sizeof buf,
 676                             "Read from remote host %.300s: %.100s\r\n",
 677                             host, strerror(errno));
 678                         buffer_append(&stderr_buffer, buf, strlen(buf));
 679                         quit_pending = 1;
 680                         return;
 681                 }
 682                 packet_process_incoming(buf, len);
 683         }
 684 }
 685
 686 static void
 687 client_status_confirm(int type, Channel *c, void *ctx)
 688 {
 689         struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
 690         char errmsg[256];
 691         int tochan;
 692
 693         /* XXX supress on mux _client_ quietmode */
 694         tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
 695             c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
 696
 697         if (type == SSH2_MSG_CHANNEL_SUCCESS) {
 698                 debug2("%s request accepted on channel %d",
 699                     cr->request_type, c->self);
 700         } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
 701                 if (tochan) {
 702                         snprintf(errmsg, sizeof(errmsg),
 703                             "%s request failed\r\n", cr->request_type);
 704                 } else {
 705                         snprintf(errmsg, sizeof(errmsg),
 706                             "%s request failed on channel %d",
 707                             cr->request_type, c->self);
 708                 }
 709                 /* If error occurred on primary session channel, then exit */
 710                 if (cr->do_close && c->self == session_ident)
 711                         fatal("%s", errmsg);
 712                 /* If error occurred on mux client, append to their stderr */
 713                 if (tochan)
 714                         buffer_append(&c->extended, errmsg, strlen(errmsg));
 715                 else
 716                         error("%s", errmsg);
 717                 if (cr->do_close) {
 718                         chan_read_failed(c);
 719                         chan_write_failed(c);
 720                 }
 721         }
 722         xfree(cr);
 723 }
 724
 725 static void
 726 client_abandon_status_confirm(Channel *c, void *ctx)
 727 {
 728         xfree(ctx);
 729 }
 730
 731 static void
 732 client_expect_confirm(int id, const char *request, int do_close)
 733 {
 734         struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
 735
 736         cr->request_type = request;
 737         cr->do_close = do_close;
 738
 739         channel_register_status_confirm(id, client_status_confirm,
 740             client_abandon_status_confirm, cr);
 741 }
 742
 743 void
 744 client_register_global_confirm(global_confirm_cb *cb, void *ctx)
 745 {
 746         struct global_confirm *gc, *last_gc;
 747
 748         /* Coalesce identical callbacks */
 749         last_gc = TAILQ_LAST(&global_confirms, global_confirms);
 750         if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
 751                 if (++last_gc->ref_count >= INT_MAX)
 752                         fatal("%s: last_gc->ref_count = %d",
 753                             __func__, last_gc->ref_count);
 754                 return;
 755         }
 756
 757         gc = xmalloc(sizeof(*gc));
 758         gc->cb = cb;
 759         gc->ctx = ctx;
 760         gc->ref_count = 1;
 761         TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
 762 }
 763
 764 static void
 765 process_cmdline(void)
 766 {
 767         void (*handler)(int);
 768         char *s, *cmd, *cancel_host;
 769         int delete = 0;
 770         int local = 0, remote = 0, dynamic = 0;
 771         int cancel_port;
 772         Forward fwd;
 773
 774         bzero(&fwd, sizeof(fwd));
 775         fwd.listen_host = fwd.connect_host = NULL;
 776
 777         leave_raw_mode(force_tty_flag);
 778         handler = signal(SIGINT, SIG_IGN);
 779         cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
 780         if (s == NULL)
 781                 goto out;
 782         while (isspace(*s))
 783                 s++;
 784         if (*s == '-')
 785                 s++;    /* Skip cmdline '-', if any */
 786         if (*s == '\0')
 787                 goto out;
 788
 789         if (*s == 'h' || *s == 'H' || *s == '?') {
 790                 logit("Commands:");
 791                 logit("      -L[bind_address:]port:host:hostport    "
 792                     "Request local forward");
 793                 logit("      -R[bind_address:]port:host:hostport    "
 794                     "Request remote forward");
 795                 logit("      -D[bind_address:]port                  "
 796                     "Request dynamic forward");
 797                 logit("      -KR[bind_address:]port                 "
 798                     "Cancel remote forward");
 799                 if (!options.permit_local_command)
 800                         goto out;
 801                 logit("      !args                                  "
 802                     "Execute local command");
 803                 goto out;
 804         }
 805
 806         if (*s == '!' && options.permit_local_command) {
 807                 s++;
 808                 ssh_local_cmd(s);
 809                 goto out;
 810         }
 811
 812         if (*s == 'K') {
 813                 delete = 1;
 814                 s++;
 815         }
 816         if (*s == 'L')
 817                 local = 1;
 818         else if (*s == 'R')
 819                 remote = 1;
 820         else if (*s == 'D')
 821                 dynamic = 1;
 822         else {
 823                 logit("Invalid command.");
 824                 goto out;
 825         }
 826
 827         if ((local || dynamic) && delete) {
 828                 logit("Not supported.");
 829                 goto out;
 830         }
 831         if (remote && delete && !compat20) {
 832                 logit("Not supported for SSH protocol version 1.");
 833                 goto out;
 834         }
 835
 836         while (isspace(*++s))
 837                 ;
 838
 839         /* XXX update list of forwards in options */
 840         if (delete) {
 841                 cancel_port = 0;
 842                 cancel_host = hpdelim(&s);      /* may be NULL */
 843                 if (s != NULL) {
 844                         cancel_port = a2port(s);
 845                         cancel_host = cleanhostname(cancel_host);
 846                 } else {
 847                         cancel_port = a2port(cancel_host);
 848                         cancel_host = NULL;
 849                 }
 850                 if (cancel_port <= 0) {
 851                         logit("Bad forwarding close port");
 852                         goto out;
 853                 }
 854                 channel_request_rforward_cancel(cancel_host, cancel_port);
 855         } else {
 856                 if (!parse_forward(&fwd, s, dynamic, remote)) {
 857                         logit("Bad forwarding specification.");
 858                         goto out;
 859                 }
 860                 if (local || dynamic) {
 861                         if (channel_setup_local_fwd_listener(fwd.listen_host,
 862                             fwd.listen_port, fwd.connect_host,
 863                             fwd.connect_port, options.gateway_ports) < 0) {
 864                                 logit("Port forwarding failed.");
 865                                 goto out;
 866                         }
 867                 } else {
 868                         if (channel_request_remote_forwarding(fwd.listen_host,
 869                             fwd.listen_port, fwd.connect_host,
 870                             fwd.connect_port) < 0) {
 871                                 logit("Port forwarding failed.");
 872                                 goto out;
 873                         }
 874                 }
 875
 876                 logit("Forwarding port.");
 877         }
 878
 879 out:
 880         signal(SIGINT, handler);
 881         enter_raw_mode(force_tty_flag);
 882         if (cmd)
 883                 xfree(cmd);
 884         if (fwd.listen_host != NULL)
 885                 xfree(fwd.listen_host);
 886         if (fwd.connect_host != NULL)
 887                 xfree(fwd.connect_host);
 888 }
 889
 890 /*
 891  * Process the characters one by one, call with c==NULL for proto1 case.
 892  */
 893 static int
 894 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
 895     char *buf, int len)
 896 {
 897         char string[1024];
 898         pid_t pid;
 899         int bytes = 0;
 900         u_int i;
 901         u_char ch;
 902         char *s;
 903         int *escape_pendingp, escape_char;
 904         struct escape_filter_ctx *efc;
 905
 906         if (c == NULL) {
 907                 escape_pendingp = &escape_pending1;
 908                 escape_char = escape_char1;
 909         } else {
 910                 if (c->filter_ctx == NULL)
 911                         return 0;
 912                 efc = (struct escape_filter_ctx *)c->filter_ctx;
 913                 escape_pendingp = &efc->escape_pending;
 914                 escape_char = efc->escape_char;
 915         }
 916
 917         if (len <= 0)
 918                 return (0);
 919
 920         for (i = 0; i < (u_int)len; i++) {
 921                 /* Get one character at a time. */
 922                 ch = buf[i];
 923
 924                 if (*escape_pendingp) {
 925                         /* We have previously seen an escape character. */
 926                         /* Clear the flag now. */
 927                         *escape_pendingp = 0;
 928
 929                         /* Process the escaped character. */
 930                         switch (ch) {
 931                         case '.':
 932                                 /* Terminate the connection. */
 933                                 snprintf(string, sizeof string, "%c.\r\n",
 934                                     escape_char);
 935                                 buffer_append(berr, string, strlen(string));
 936
 937                                 if (c && c->ctl_chan != -1) {
 938                                         chan_read_failed(c);
 939                                         chan_write_failed(c);
 940                                         return 0;
 941                                 } else
 942                                         quit_pending = 1;
 943                                 return -1;
 944
 945                         case 'Z' - 64:
 946                                 /* XXX support this for mux clients */
 947                                 if (c && c->ctl_chan != -1) {
 948  noescape:
 949                                         snprintf(string, sizeof string,
 950                                             "%c%c escape not available to "
 951                                             "multiplexed sessions\r\n",
 952                                             escape_char, ch);
 953                                         buffer_append(berr, string,
 954                                             strlen(string));
 955                                         continue;
 956                                 }
 957                                 /* Suspend the program. Inform the user */
 958                                 snprintf(string, sizeof string,
 959                                     "%c^Z [suspend ssh]\r\n", escape_char);
 960                                 buffer_append(berr, string, strlen(string));
 961
 962                                 /* Restore terminal modes and suspend. */
 963                                 client_suspend_self(bin, bout, berr);
 964
 965                                 /* We have been continued. */
 966                                 continue;
 967
 968                         case 'B':
 969                                 if (compat20) {
 970                                         snprintf(string, sizeof string,
 971                                             "%cB\r\n", escape_char);
 972                                         buffer_append(berr, string,
 973                                             strlen(string));
 974                                         channel_request_start(session_ident,
 975                                             "break", 0);
 976                                         packet_put_int(1000);
 977                                         packet_send();
 978                                 }
 979                                 continue;
 980
 981                         case 'R':
 982                                 if (compat20) {
 983                                         if (datafellows & SSH_BUG_NOREKEY)
 984                                                 logit("Server does not "
 985                                                     "support re-keying");
 986                                         else
 987                                                 need_rekeying = 1;
 988                                 }
 989                                 continue;
 990
 991                         case '&':
 992                                 if (c && c->ctl_chan != -1)
 993                                         goto noescape;
 994                                 /*
 995                                  * Detach the program (continue to serve
 996                                  * connections, but put in background and no
 997                                  * more new connections).
 998                                  */
 999                                 /* Restore tty modes. */
1000                                 leave_raw_mode(force_tty_flag);
1001
1002                                 /* Stop listening for new connections. */
1003                                 channel_stop_listening();
1004
1005                                 snprintf(string, sizeof string,
1006                                     "%c& [backgrounded]\n", escape_char);
1007                                 buffer_append(berr, string, strlen(string));
1008
1009                                 /* Fork into background. */
1010                                 pid = fork();
1011                                 if (pid < 0) {
1012                                         error("fork: %.100s", strerror(errno));
1013                                         continue;
1014                                 }
1015                                 if (pid != 0) { /* This is the parent. */
1016                                         /* The parent just exits. */
1017                                         exit(0);
1018                                 }
1019                                 /* The child continues serving connections. */
1020                                 if (compat20) {
1021                                         buffer_append(bin, "\004", 1);
1022                                         /* fake EOF on stdin */
1023                                         return -1;
1024                                 } else if (!stdin_eof) {
1025                                         /*
1026                                          * Sending SSH_CMSG_EOF alone does not
1027                                          * always appear to be enough.  So we
1028                                          * try to send an EOF character first.
1029                                          */
1030                                         packet_start(SSH_CMSG_STDIN_DATA);
1031                                         packet_put_string("\004", 1);
1032                                         packet_send();
1033                                         /* Close stdin. */
1034                                         stdin_eof = 1;
1035                                         if (buffer_len(bin) == 0) {
1036                                                 packet_start(SSH_CMSG_EOF);
1037                                                 packet_send();
1038                                         }
1039                                 }
1040                                 continue;
1041
1042                         case '?':
1043                                 if (c && c->ctl_chan != -1) {
1044                                         snprintf(string, sizeof string,
1045 "%c?\r\n\
1046 Supported escape sequences:\r\n\
1047   %c.  - terminate session\r\n\
1048   %cB  - send a BREAK to the remote system\r\n\
1049   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1050   %c#  - list forwarded connections\r\n\
1051   %c?  - this message\r\n\
1052   %c%c  - send the escape character by typing it twice\r\n\
1053 (Note that escapes are only recognized immediately after newline.)\r\n",
1054                                             escape_char, escape_char,
1055                                             escape_char, escape_char,
1056                                             escape_char, escape_char,
1057                                             escape_char, escape_char);
1058                                 } else {
1059                                         snprintf(string, sizeof string,
1060 "%c?\r\n\
1061 Supported escape sequences:\r\n\
1062   %c.  - terminate connection (and any multiplexed sessions)\r\n\
1063   %cB  - send a BREAK to the remote system\r\n\
1064   %cC  - open a command line\r\n\
1065   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1066   %c^Z - suspend ssh\r\n\
1067   %c#  - list forwarded connections\r\n\
1068   %c&  - background ssh (when waiting for connections to terminate)\r\n\
1069   %c?  - this message\r\n\
1070   %c%c  - send the escape character by typing it twice\r\n\
1071 (Note that escapes are only recognized immediately after newline.)\r\n",
1072                                             escape_char, escape_char,
1073                                             escape_char, escape_char,
1074                                             escape_char, escape_char,
1075                                             escape_char, escape_char,
1076                                             escape_char, escape_char,
1077                                             escape_char);
1078                                 }
1079                                 buffer_append(berr, string, strlen(string));
1080                                 continue;
1081
1082                         case '#':
1083                                 snprintf(string, sizeof string, "%c#\r\n",
1084                                     escape_char);
1085                                 buffer_append(berr, string, strlen(string));
1086                                 s = channel_open_message();
1087                                 buffer_append(berr, s, strlen(s));
1088                                 xfree(s);
1089                                 continue;
1090
1091                         case 'C':
1092                                 if (c && c->ctl_chan != -1)
1093                                         goto noescape;
1094                                 process_cmdline();
1095                                 continue;
1096
1097                         default:
1098                                 if (ch != escape_char) {
1099                                         buffer_put_char(bin, escape_char);
1100                                         bytes++;
1101                                 }
1102                                 /* Escaped characters fall through here */
1103                                 break;
1104                         }
1105                 } else {
1106                         /*
1107                          * The previous character was not an escape char.
1108                          * Check if this is an escape.
1109                          */
1110                         if (last_was_cr && ch == escape_char) {
1111                                 /*
1112                                  * It is. Set the flag and continue to
1113                                  * next character.
1114                                  */
1115                                 *escape_pendingp = 1;
1116                                 continue;
1117                         }
1118                 }
1119
1120                 /*
1121                  * Normal character.  Record whether it was a newline,
1122                  * and append it to the buffer.
1123                  */
1124                 last_was_cr = (ch == '\r' || ch == '\n');
1125                 buffer_put_char(bin, ch);
1126                 bytes++;
1127         }
1128         return bytes;
1129 }
1130
1131 static void
1132 client_process_input(fd_set *readset)
1133 {
1134         int len;
1135         char buf[SSH_IOBUFSZ];
1136
1137         /* Read input from stdin. */
1138         if (FD_ISSET(fileno(stdin), readset)) {
1139                 /* Read as much as possible. */
1140                 len = read(fileno(stdin), buf, sizeof(buf));
1141                 if (len < 0 &&
1142                     (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
1143                         return;         /* we'll try again later */
1144                 if (len <= 0) {
1145                         /*
1146                          * Received EOF or error.  They are treated
1147                          * similarly, except that an error message is printed
1148                          * if it was an error condition.
1149                          */
1150                         if (len < 0) {
1151                                 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1152                                     strerror(errno));
1153                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1154                         }
1155                         /* Mark that we have seen EOF. */
1156                         stdin_eof = 1;
1157                         /*
1158                          * Send an EOF message to the server unless there is
1159                          * data in the buffer.  If there is data in the
1160                          * buffer, no message will be sent now.  Code
1161                          * elsewhere will send the EOF when the buffer
1162                          * becomes empty if stdin_eof is set.
1163                          */
1164                         if (buffer_len(&stdin_buffer) == 0) {
1165                                 packet_start(SSH_CMSG_EOF);
1166                                 packet_send();
1167                         }
1168                 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1169                         /*
1170                          * Normal successful read, and no escape character.
1171                          * Just append the data to buffer.
1172                          */
1173                         buffer_append(&stdin_buffer, buf, len);
1174                 } else {
1175                         /*
1176                          * Normal, successful read.  But we have an escape
1177                          * character and have to process the characters one
1178                          * by one.
1179                          */
1180                         if (process_escapes(NULL, &stdin_buffer,
1181                             &stdout_buffer, &stderr_buffer, buf, len) == -1)
1182                                 return;
1183                 }
1184         }
1185 }
1186
1187 static void
1188 client_process_output(fd_set *writeset)
1189 {
1190         int len;
1191         char buf[100];
1192
1193         /* Write buffered output to stdout. */
1194         if (FD_ISSET(fileno(stdout), writeset)) {
1195                 /* Write as much data as possible. */
1196                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1197                     buffer_len(&stdout_buffer));
1198                 if (len <= 0) {
1199                         if (errno == EINTR || errno == EAGAIN ||
1200                             errno == EWOULDBLOCK)
1201                                 len = 0;
1202                         else {
1203                                 /*
1204                                  * An error or EOF was encountered.  Put an
1205                                  * error message to stderr buffer.
1206                                  */
1207                                 snprintf(buf, sizeof buf,
1208                                     "write stdout: %.50s\r\n", strerror(errno));
1209                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1210                                 quit_pending = 1;
1211                                 return;
1212                         }
1213                 }
1214                 /* Consume printed data from the buffer. */
1215                 buffer_consume(&stdout_buffer, len);
1216         }
1217         /* Write buffered output to stderr. */
1218         if (FD_ISSET(fileno(stderr), writeset)) {
1219                 /* Write as much data as possible. */
1220                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1221                     buffer_len(&stderr_buffer));
1222                 if (len <= 0) {
1223                         if (errno == EINTR || errno == EAGAIN ||
1224                             errno == EWOULDBLOCK)
1225                                 len = 0;
1226                         else {
1227                                 /*
1228                                  * EOF or error, but can't even print
1229                                  * error message.
1230                                  */
1231                                 quit_pending = 1;
1232                                 return;
1233                         }
1234                 }
1235                 /* Consume printed characters from the buffer. */
1236                 buffer_consume(&stderr_buffer, len);
1237         }
1238 }
1239
1240 /*
1241  * Get packets from the connection input buffer, and process them as long as
1242  * there are packets available.
1243  *
1244  * Any unknown packets received during the actual
1245  * session cause the session to terminate.  This is
1246  * intended to make debugging easier since no
1247  * confirmations are sent.  Any compatible protocol
1248  * extensions must be negotiated during the
1249  * preparatory phase.
1250  */
1251
1252 static void
1253 client_process_buffered_input_packets(void)
1254 {
1255         dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1256             compat20 ? xxx_kex : NULL);
1257 }
1258
1259 /* scan buf[] for '~' before sending data to the peer */
1260
1261 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1262 void *
1263 client_new_escape_filter_ctx(int escape_char)
1264 {
1265         struct escape_filter_ctx *ret;
1266
1267         ret = xmalloc(sizeof(*ret));
1268         ret->escape_pending = 0;
1269         ret->escape_char = escape_char;
1270         return (void *)ret;
1271 }
1272
1273 /* Free the escape filter context on channel free */
1274 void
1275 client_filter_cleanup(int cid, void *ctx)
1276 {
1277         xfree(ctx);
1278 }
1279
1280 int
1281 client_simple_escape_filter(Channel *c, char *buf, int len)
1282 {
1283         if (c->extended_usage != CHAN_EXTENDED_WRITE)
1284                 return 0;
1285
1286         return process_escapes(c, &c->input, &c->output, &c->extended,
1287             buf, len);
1288 }
1289
1290 static void
1291 client_channel_closed(int id, void *arg)
1292 {
1293         channel_cancel_cleanup(id);
1294         session_closed = 1;
1295         leave_raw_mode(force_tty_flag);
1296 }
1297
1298 /*
1299  * Implements the interactive session with the server.  This is called after
1300  * the user has been authenticated, and a command has been started on the
1301  * remote host.  If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1302  * used as an escape character for terminating or suspending the session.
1303  */
1304
1305 int
1306 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1307 {
1308         fd_set *readset = NULL, *writeset = NULL;
1309         double start_time, total_time;
1310         int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1311         u_int64_t ibytes, obytes;
1312         u_int nalloc = 0;
1313         char buf[100];
1314
1315         debug("Entering interactive session.");
1316
1317         start_time = get_current_time();
1318
1319         /* Initialize variables. */
1320         escape_pending1 = 0;
1321         last_was_cr = 1;
1322         exit_status = -1;
1323         stdin_eof = 0;
1324         buffer_high = 64 * 1024;
1325         connection_in = packet_get_connection_in();
1326         connection_out = packet_get_connection_out();
1327         max_fd = MAX(connection_in, connection_out);
1328
1329         if (!compat20) {
1330                 /* enable nonblocking unless tty */
1331                 if (!isatty(fileno(stdin)))
1332                         set_nonblock(fileno(stdin));
1333                 if (!isatty(fileno(stdout)))
1334                         set_nonblock(fileno(stdout));
1335                 if (!isatty(fileno(stderr)))
1336                         set_nonblock(fileno(stderr));
1337                 max_fd = MAX(max_fd, fileno(stdin));
1338                 max_fd = MAX(max_fd, fileno(stdout));
1339                 max_fd = MAX(max_fd, fileno(stderr));
1340         }
1341         quit_pending = 0;
1342         escape_char1 = escape_char_arg;
1343
1344         /* Initialize buffers. */
1345         buffer_init(&stdin_buffer);
1346         buffer_init(&stdout_buffer);
1347         buffer_init(&stderr_buffer);
1348
1349         client_init_dispatch();
1350
1351         /*
1352          * Set signal handlers, (e.g. to restore non-blocking mode)
1353          * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1354          */
1355         if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1356                 signal(SIGHUP, signal_handler);
1357         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1358                 signal(SIGINT, signal_handler);
1359         if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1360                 signal(SIGQUIT, signal_handler);
1361         if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1362                 signal(SIGTERM, signal_handler);
1363         signal(SIGWINCH, window_change_handler);
1364
1365         if (have_pty)
1366                 enter_raw_mode(force_tty_flag);
1367
1368         if (compat20) {
1369                 session_ident = ssh2_chan_id;
1370                 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1371                         channel_register_filter(session_ident,
1372                             client_simple_escape_filter, NULL,
1373                             client_filter_cleanup,
1374                             client_new_escape_filter_ctx(escape_char_arg));
1375                 if (session_ident != -1)
1376                         channel_register_cleanup(session_ident,
1377                             client_channel_closed, 0);
1378         } else {
1379                 /* Check if we should immediately send eof on stdin. */
1380                 client_check_initial_eof_on_stdin();
1381         }
1382
1383         /* Main loop of the client for the interactive session mode. */
1384         while (!quit_pending) {
1385
1386                 /* Process buffered packets sent by the server. */
1387                 client_process_buffered_input_packets();
1388
1389                 if (compat20 && session_closed && !channel_still_open())
1390                         break;
1391
1392                 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1393
1394                 if (rekeying) {
1395                         debug("rekeying in progress");
1396                 } else {
1397                         /*
1398                          * Make packets of buffered stdin data, and buffer
1399                          * them for sending to the server.
1400                          */
1401                         if (!compat20)
1402                                 client_make_packets_from_stdin_data();
1403
1404                         /*
1405                          * Make packets from buffered channel data, and
1406                          * enqueue them for sending to the server.
1407                          */
1408                         if (packet_not_very_much_data_to_write())
1409                                 channel_output_poll();
1410
1411                         /*
1412                          * Check if the window size has changed, and buffer a
1413                          * message about it to the server if so.
1414                          */
1415                         client_check_window_change();
1416
1417                         if (quit_pending)
1418                                 break;
1419                 }
1420                 /*
1421                  * Wait until we have something to do (something becomes
1422                  * available on one of the descriptors).
1423                  */
1424                 max_fd2 = max_fd;
1425                 client_wait_until_can_do_something(&readset, &writeset,
1426                     &max_fd2, &nalloc, rekeying);
1427
1428                 if (quit_pending)
1429                         break;
1430
1431                 /* Do channel operations unless rekeying in progress. */
1432                 if (!rekeying) {
1433                         channel_after_select(readset, writeset);
1434                         if (need_rekeying || packet_need_rekeying()) {
1435                                 debug("need rekeying");
1436                                 xxx_kex->done = 0;
1437                                 kex_send_kexinit(xxx_kex);
1438                                 need_rekeying = 0;
1439                         }
1440                 }
1441
1442                 /* Buffer input from the connection.  */
1443                 client_process_net_input(readset);
1444
1445                 if (quit_pending)
1446                         break;
1447
1448                 if (!compat20) {
1449                         /* Buffer data from stdin */
1450                         client_process_input(readset);
1451                         /*
1452                          * Process output to stdout and stderr.  Output to
1453                          * the connection is processed elsewhere (above).
1454                          */
1455                         client_process_output(writeset);
1456                 }
1457
1458                 if (session_resumed) {
1459                         connection_in = packet_get_connection_in();
1460                         connection_out = packet_get_connection_out();
1461                         max_fd = MAX(max_fd, connection_out);
1462                         max_fd = MAX(max_fd, connection_in);
1463                         session_resumed = 0;
1464                 }
1465
1466                 /*
1467                  * Send as much buffered packet data as possible to the
1468                  * sender.
1469                  */
1470                 if (FD_ISSET(connection_out, writeset))
1471                         packet_write_poll();
1472         }
1473         if (readset)
1474                 xfree(readset);
1475         if (writeset)
1476                 xfree(writeset);
1477
1478         /* Terminate the session. */
1479
1480         /* Stop watching for window change. */
1481         signal(SIGWINCH, SIG_DFL);
1482
1483         if (compat20) {
1484                 packet_start(SSH2_MSG_DISCONNECT);
1485                 packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1486                 packet_put_cstring("disconnected by user");
1487                 packet_send();
1488                 packet_write_wait();
1489         }
1490
1491         channel_free_all();
1492
1493         if (have_pty)
1494                 leave_raw_mode(force_tty_flag);
1495
1496         /* restore blocking io */
1497         if (!isatty(fileno(stdin)))
1498                 unset_nonblock(fileno(stdin));
1499         if (!isatty(fileno(stdout)))
1500                 unset_nonblock(fileno(stdout));
1501         if (!isatty(fileno(stderr)))
1502                 unset_nonblock(fileno(stderr));
1503
1504         /*
1505          * If there was no shell or command requested, there will be no remote
1506          * exit status to be returned.  In that case, clear error code if the
1507          * connection was deliberately terminated at this end.
1508          */
1509         if (no_shell_flag && received_signal == SIGTERM) {
1510                 received_signal = 0;
1511                 exit_status = 0;
1512         }
1513
1514         if (received_signal)
1515                 fatal("Killed by signal %d.", (int) received_signal);
1516
1517         /*
1518          * In interactive mode (with pseudo tty) display a message indicating
1519          * that the connection has been closed.
1520          */
1521         if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1522                 snprintf(buf, sizeof buf,
1523                     "Connection to %.64s closed.\r\n", host);
1524                 buffer_append(&stderr_buffer, buf, strlen(buf));
1525         }
1526
1527         /* Output any buffered data for stdout. */
1528         while (buffer_len(&stdout_buffer) > 0) {
1529                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1530                     buffer_len(&stdout_buffer));
1531                 if (len <= 0) {
1532                         error("Write failed flushing stdout buffer.");
1533                         break;
1534                 }
1535                 buffer_consume(&stdout_buffer, len);
1536         }
1537
1538         /* Output any buffered data for stderr. */
1539         while (buffer_len(&stderr_buffer) > 0) {
1540                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1541                     buffer_len(&stderr_buffer));
1542                 if (len <= 0) {
1543                         error("Write failed flushing stderr buffer.");
1544                         break;
1545                 }
1546                 buffer_consume(&stderr_buffer, len);
1547         }
1548
1549         /* Clear and free any buffers. */
1550         memset(buf, 0, sizeof(buf));
1551         buffer_free(&stdin_buffer);
1552         buffer_free(&stdout_buffer);
1553         buffer_free(&stderr_buffer);
1554
1555         /* Report bytes transferred, and transfer rates. */
1556         total_time = get_current_time() - start_time;
1557         packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1558         packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1559         verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1560             obytes, ibytes, total_time);
1561         if (total_time > 0)
1562                 verbose("Bytes per second: sent %.1f, received %.1f",
1563                     obytes / total_time, ibytes / total_time);
1564         /* Return the exit status of the program. */
1565         debug("Exit status %d", exit_status);
1566         return exit_status;
1567 }
1568
1569 /*********/
1570
1571 static void
1572 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1573 {
1574         u_int data_len;
1575         char *data = packet_get_string(&data_len);
1576         packet_check_eom();
1577         buffer_append(&stdout_buffer, data, data_len);
1578         memset(data, 0, data_len);
1579         xfree(data);
1580 }
1581 static void
1582 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1583 {
1584         u_int data_len;
1585         char *data = packet_get_string(&data_len);
1586         packet_check_eom();
1587         buffer_append(&stderr_buffer, data, data_len);
1588         memset(data, 0, data_len);
1589         xfree(data);
1590 }
1591 static void
1592 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1593 {
1594         exit_status = packet_get_int();
1595         packet_check_eom();
1596         /* Acknowledge the exit. */
1597         packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1598         packet_send();
1599         /*
1600          * Must wait for packet to be sent since we are
1601          * exiting the loop.
1602          */
1603         packet_write_wait();
1604         /* Flag that we want to exit. */
1605         quit_pending = 1;
1606 }
1607 static void
1608 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1609 {
1610         Channel *c = NULL;
1611         int remote_id, sock;
1612
1613         /* Read the remote channel number from the message. */
1614         remote_id = packet_get_int();
1615         packet_check_eom();
1616
1617         /*
1618          * Get a connection to the local authentication agent (this may again
1619          * get forwarded).
1620          */
1621         sock = ssh_get_authentication_socket();
1622
1623         /*
1624          * If we could not connect the agent, send an error message back to
1625          * the server. This should never happen unless the agent dies,
1626          * because authentication forwarding is only enabled if we have an
1627          * agent.
1628          */
1629         if (sock >= 0) {
1630                 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1631                     -1, 0, 0, 0, "authentication agent connection", 1);
1632                 c->remote_id = remote_id;
1633                 c->force_drain = 1;
1634         }
1635         if (c == NULL) {
1636                 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1637                 packet_put_int(remote_id);
1638         } else {
1639                 /* Send a confirmation to the remote host. */
1640                 debug("Forwarding authentication connection.");
1641                 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1642                 packet_put_int(remote_id);
1643                 packet_put_int(c->self);
1644         }
1645         packet_send();
1646 }
1647
1648 static Channel *
1649 client_request_forwarded_tcpip(const char *request_type, int rchan)
1650 {
1651         Channel *c = NULL;
1652         char *listen_address, *originator_address;
1653         u_short listen_port, originator_port;
1654
1655         /* Get rest of the packet */
1656         listen_address = packet_get_string(NULL);
1657         listen_port = packet_get_int();
1658         originator_address = packet_get_string(NULL);
1659         originator_port = packet_get_int();
1660         packet_check_eom();
1661
1662         debug("client_request_forwarded_tcpip: listen %s port %d, "
1663             "originator %s port %d", listen_address, listen_port,
1664             originator_address, originator_port);
1665
1666         c = channel_connect_by_listen_address(listen_port,
1667             "forwarded-tcpip", originator_address);
1668
1669         xfree(originator_address);
1670         xfree(listen_address);
1671         return c;
1672 }
1673
1674 static Channel *
1675 client_request_x11(const char *request_type, int rchan)
1676 {
1677         Channel *c = NULL;
1678         char *originator;
1679         u_short originator_port;
1680         int sock;
1681
1682         if (!options.forward_x11) {
1683                 error("Warning: ssh server tried X11 forwarding.");
1684                 error("Warning: this is probably a break-in attempt by a "
1685                     "malicious server.");
1686                 return NULL;
1687         }
1688         originator = packet_get_string(NULL);
1689         if (datafellows & SSH_BUG_X11FWD) {
1690                 debug2("buggy server: x11 request w/o originator_port");
1691                 originator_port = 0;
1692         } else {
1693                 originator_port = packet_get_int();
1694         }
1695         packet_check_eom();
1696         /* XXX check permission */
1697         debug("client_request_x11: request from %s %d", originator,
1698             originator_port);
1699         xfree(originator);
1700         sock = x11_connect_display();
1701         if (sock < 0)
1702                 return NULL;
1703         c = channel_new("x11",
1704             SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1705             CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1706         c->force_drain = 1;
1707         return c;
1708 }
1709
1710 static Channel *
1711 client_request_agent(const char *request_type, int rchan)
1712 {
1713         Channel *c = NULL;
1714         int sock;
1715
1716         if (!options.forward_agent) {
1717                 error("Warning: ssh server tried agent forwarding.");
1718                 error("Warning: this is probably a break-in attempt by a "
1719                     "malicious server.");
1720                 return NULL;
1721         }
1722         sock = ssh_get_authentication_socket();
1723         if (sock < 0)
1724                 return NULL;
1725         c = channel_new("authentication agent connection",
1726             SSH_CHANNEL_OPEN, sock, sock, -1,
1727             CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1728             "authentication agent connection", 1);
1729         c->force_drain = 1;
1730         return c;
1731 }
1732
1733 int
1734 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1735 {
1736         Channel *c;
1737         int fd;
1738
1739         if (tun_mode == SSH_TUNMODE_NO)
1740                 return 0;
1741
1742         if (!compat20) {
1743                 error("Tunnel forwarding is not supported for protocol 1");
1744                 return -1;
1745         }
1746
1747         debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1748
1749         /* Open local tunnel device */
1750         if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1751                 error("Tunnel device open failed.");
1752                 return -1;
1753         }
1754
1755         c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1756             CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1757         c->datagram = 1;
1758
1759 #if defined(SSH_TUN_FILTER)
1760         if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1761                 channel_register_filter(c->self, sys_tun_infilter,
1762                     sys_tun_outfilter, NULL, NULL);
1763 #endif
1764
1765         packet_start(SSH2_MSG_CHANNEL_OPEN);
1766         packet_put_cstring("tun@openssh.com");
1767         packet_put_int(c->self);
1768         packet_put_int(c->local_window_max);
1769         packet_put_int(c->local_maxpacket);
1770         packet_put_int(tun_mode);
1771         packet_put_int(remote_tun);
1772         packet_send();
1773
1774         return 0;
1775 }
1776
1777 /* XXXX move to generic input handler */
1778 static void
1779 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1780 {
1781         Channel *c = NULL;
1782         char *ctype;
1783         int rchan;
1784         u_int rmaxpack, rwindow, len;
1785
1786         ctype = packet_get_string(&len);
1787         rchan = packet_get_int();
1788         rwindow = packet_get_int();
1789         rmaxpack = packet_get_int();
1790
1791         debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1792             ctype, rchan, rwindow, rmaxpack);
1793
1794         if (strcmp(ctype, "forwarded-tcpip") == 0) {
1795                 c = client_request_forwarded_tcpip(ctype, rchan);
1796         } else if (strcmp(ctype, "x11") == 0) {
1797                 c = client_request_x11(ctype, rchan);
1798         } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1799                 c = client_request_agent(ctype, rchan);
1800         }
1801 /* XXX duplicate : */
1802         if (c != NULL) {
1803                 debug("confirm %s", ctype);
1804                 c->remote_id = rchan;
1805                 c->remote_window = rwindow;
1806                 c->remote_maxpacket = rmaxpack;
1807                 if (c->type != SSH_CHANNEL_CONNECTING) {
1808                         packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1809                         packet_put_int(c->remote_id);
1810                         packet_put_int(c->self);
1811                         packet_put_int(c->local_window);
1812                         packet_put_int(c->local_maxpacket);
1813                         packet_send();
1814                 }
1815         } else {
1816                 debug("failure %s", ctype);
1817                 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1818                 packet_put_int(rchan);
1819                 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1820                 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1821                         packet_put_cstring("open failed");
1822                         packet_put_cstring("");
1823                 }
1824                 packet_send();
1825         }
1826         xfree(ctype);
1827 }
1828 static void
1829 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1830 {
1831         Channel *c = NULL;
1832         int exitval, id, reply, success = 0;
1833         char *rtype;
1834
1835         id = packet_get_int();
1836         rtype = packet_get_string(NULL);
1837         reply = packet_get_char();
1838
1839         debug("client_input_channel_req: channel %d rtype %s reply %d",
1840             id, rtype, reply);
1841
1842         if (id == -1) {
1843                 error("client_input_channel_req: request for channel -1");
1844         } else if ((c = channel_lookup(id)) == NULL) {
1845                 error("client_input_channel_req: channel %d: "
1846                     "unknown channel", id);
1847         } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1848                 packet_check_eom();
1849                 chan_rcvd_eow(c);
1850         } else if (strcmp(rtype, "exit-status") == 0) {
1851                 exitval = packet_get_int();
1852                 if (c->ctl_chan != -1) {
1853                         mux_exit_message(c, exitval);
1854                         success = 1;
1855                 } else if (id == session_ident) {
1856                         /* Record exit value of local session */
1857                         success = 1;
1858                         exit_status = exitval;
1859                 } else {
1860                         /* Probably for a mux channel that has already closed */
1861                         debug("%s: no sink for exit-status on channel %d",
1862                             __func__, id);
1863                 }
1864                 packet_check_eom();
1865         }
1866         if (reply) {
1867                 packet_start(success ?
1868                     SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1869                 packet_put_int(c->remote_id);
1870                 packet_send();
1871         }
1872         xfree(rtype);
1873 }
1874 static void
1875 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1876 {
1877         char *rtype;
1878         int want_reply;
1879         int success = 0;
1880
1881         rtype = packet_get_string(NULL);
1882         want_reply = packet_get_char();
1883         debug("client_input_global_request: rtype %s want_reply %d",
1884             rtype, want_reply);
1885         if (want_reply) {
1886                 packet_start(success ?
1887                     SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1888                 packet_send();
1889                 packet_write_wait();
1890         }
1891         xfree(rtype);
1892 }
1893
1894 void
1895 client_session2_setup(int id, int want_tty, int want_subsystem,
1896     const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1897 {
1898         int len;
1899         Channel *c = NULL;
1900
1901         debug2("%s: id %d", __func__, id);
1902
1903         if ((c = channel_lookup(id)) == NULL)
1904                 fatal("client_session2_setup: channel %d: unknown channel", id);
1905
1906         if (want_tty) {
1907                 struct winsize ws;
1908
1909                 /* Store window size in the packet. */
1910                 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1911                         memset(&ws, 0, sizeof(ws));
1912
1913                 channel_request_start(id, "pty-req", 1);
1914                 client_expect_confirm(id, "PTY allocation", 0);
1915                 packet_put_cstring(term != NULL ? term : "");
1916                 packet_put_int((u_int)ws.ws_col);
1917                 packet_put_int((u_int)ws.ws_row);
1918                 packet_put_int((u_int)ws.ws_xpixel);
1919                 packet_put_int((u_int)ws.ws_ypixel);
1920                 if (tiop == NULL)
1921                         tiop = get_saved_tio();
1922                 tty_make_modes(-1, tiop);
1923                 packet_send();
1924                 /* XXX wait for reply */
1925                 c->client_tty = 1;
1926         }
1927
1928         /* Transfer any environment variables from client to server */
1929         if (options.num_send_env != 0 && env != NULL) {
1930                 int i, j, matched;
1931                 char *name, *val;
1932
1933                 debug("Sending environment.");
1934                 for (i = 0; env[i] != NULL; i++) {
1935                         /* Split */
1936                         name = xstrdup(env[i]);
1937                         if ((val = strchr(name, '=')) == NULL) {
1938                                 xfree(name);
1939                                 continue;
1940                         }
1941                         *val++ = '\0';
1942
1943                         matched = 0;
1944                         for (j = 0; j < options.num_send_env; j++) {
1945                                 if (match_pattern(name, options.send_env[j])) {
1946                                         matched = 1;
1947                                         break;
1948                                 }
1949                         }
1950                         if (!matched) {
1951                                 debug3("Ignored env %s", name);
1952                                 xfree(name);
1953                                 continue;
1954                         }
1955
1956                         debug("Sending env %s = %s", name, val);
1957                         channel_request_start(id, "env", 0);
1958                         packet_put_cstring(name);
1959                         packet_put_cstring(val);
1960                         packet_send();
1961                         xfree(name);
1962                 }
1963         }
1964
1965         len = buffer_len(cmd);
1966         if (len > 0) {
1967                 if (len > 900)
1968                         len = 900;
1969                 if (want_subsystem) {
1970                         debug("Sending subsystem: %.*s",
1971                             len, (u_char*)buffer_ptr(cmd));
1972                         channel_request_start(id, "subsystem", 1);
1973                         client_expect_confirm(id, "subsystem", 1);
1974                 } else {
1975                         debug("Sending command: %.*s",
1976                             len, (u_char*)buffer_ptr(cmd));
1977                         channel_request_start(id, "exec", 1);
1978                         client_expect_confirm(id, "exec", 1);
1979                 }
1980                 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1981                 packet_send();
1982         } else {
1983                 channel_request_start(id, "shell", 1);
1984                 client_expect_confirm(id, "shell", 1);
1985                 packet_send();
1986         }
1987 }
1988
1989 static void
1990 client_init_dispatch_20(void)
1991 {
1992         dispatch_init(&dispatch_protocol_error);
1993
1994         dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1995         dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1996         dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1997         dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1998         dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1999         dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2000         dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2001         dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2002         dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2003         dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2004         dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2005         dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2006
2007         /* rekeying */
2008         dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2009
2010         /* global request reply messages */
2011         dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2012         dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2013 }
2014
2015 static void
2016 client_init_dispatch_13(void)
2017 {
2018         dispatch_init(NULL);
2019         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2020         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2021         dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2022         dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2023         dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2024         dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2025         dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2026         dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2027         dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2028
2029         dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2030             &client_input_agent_open : &deny_input_open);
2031         dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2032             &x11_input_open : &deny_input_open);
2033 }
2034
2035 static void
2036 client_init_dispatch_15(void)
2037 {
2038         client_init_dispatch_13();
2039         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2040         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2041 }
2042
2043 static void
2044 client_init_dispatch(void)
2045 {
2046         if (compat20)
2047                 client_init_dispatch_20();
2048         else if (compat13)
2049                 client_init_dispatch_13();
2050         else
2051                 client_init_dispatch_15();
2052 }
2053
2054 /* client specific fatal cleanup */
2055 void
2056 cleanup_exit(int i)
2057 {
2058         leave_raw_mode(force_tty_flag);
2059         leave_non_blocking();
2060         if (options.control_path != NULL && muxserver_sock != -1)
2061                 unlink(options.control_path);
2062         _exit(i);
2063 }