crypto/openssh/clientloop.c

   1 /* $OpenBSD: clientloop.c,v 1.218 2010/01/28 00:21:18 djm Exp $ */
   2 /* $FreeBSD$ */
   3 /*
   4  * Author: Tatu Ylonen <ylo@cs.hut.fi>
   5  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   6  *                    All rights reserved
   7  * The main loop for the interactive session (client side).
   8  *
   9  * As far as I am concerned, the code I have written for this software
  10  * can be used freely for any purpose.  Any derived versions of this
  11  * software must be clearly marked as such, and if the derived work is
  12  * incompatible with the protocol description in the RFC file, it must be
  13  * called by a name other than "ssh" or "Secure Shell".
  14  *
  15  *
  16  * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions
  20  * are met:
  21  * 1. Redistributions of source code must retain the above copyright
  22  *    notice, this list of conditions and the following disclaimer.
  23  * 2. Redistributions in binary form must reproduce the above copyright
  24  *    notice, this list of conditions and the following disclaimer in the
  25  *    documentation and/or other materials provided with the distribution.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  28  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  29  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  30  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  31  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  32  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  33  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  34  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  35  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  36  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37  *
  38  *
  39  * SSH2 support added by Markus Friedl.
  40  * Copyright (c) 1999, 2000, 2001 Markus Friedl.  All rights reserved.
  41  *
  42  * Redistribution and use in source and binary forms, with or without
  43  * modification, are permitted provided that the following conditions
  44  * are met:
  45  * 1. Redistributions of source code must retain the above copyright
  46  *    notice, this list of conditions and the following disclaimer.
  47  * 2. Redistributions in binary form must reproduce the above copyright
  48  *    notice, this list of conditions and the following disclaimer in the
  49  *    documentation and/or other materials provided with the distribution.
  50  *
  51  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  52  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  53  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  54  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  55  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  56  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  60  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  */
  62
  63 #include "includes.h"
  64
  65 #include <sys/types.h>
  66 #include <sys/ioctl.h>
  67 #include <sys/param.h>
  68 #ifdef HAVE_SYS_STAT_H
  69 # include <sys/stat.h>
  70 #endif
  71 #ifdef HAVE_SYS_TIME_H
  72 # include <sys/time.h>
  73 #endif
  74 #include <sys/socket.h>
  75
  76 #include <ctype.h>
  77 #include <errno.h>
  78 #ifdef HAVE_PATHS_H
  79 #include <paths.h>
  80 #endif
  81 #include <signal.h>
  82 #include <stdarg.h>
  83 #include <stdio.h>
  84 #include <stdlib.h>
  85 #include <string.h>
  86 #include <termios.h>
  87 #include <pwd.h>
  88 #include <unistd.h>
  89
  90 #include "openbsd-compat/sys-queue.h"
  91 #include "xmalloc.h"
  92 #include "ssh.h"
  93 #include "ssh1.h"
  94 #include "ssh2.h"
  95 #include "packet.h"
  96 #include "buffer.h"
  97 #include "compat.h"
  98 #include "channels.h"
  99 #include "dispatch.h"
 100 #include "key.h"
 101 #include "cipher.h"
 102 #include "kex.h"
 103 #include "log.h"
 104 #include "readconf.h"
 105 #include "clientloop.h"
 106 #include "sshconnect.h"
 107 #include "authfd.h"
 108 #include "atomicio.h"
 109 #include "sshpty.h"
 110 #include "misc.h"
 111 #include "match.h"
 112 #include "msg.h"
 113 #include "roaming.h"
 114
 115 /* import options */
 116 extern Options options;
 117
 118 /* Flag indicating that stdin should be redirected from /dev/null. */
 119 extern int stdin_null_flag;
 120
 121 /* Flag indicating that no shell has been requested */
 122 extern int no_shell_flag;
 123
 124 /* Control socket */
 125 extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
 126
 127 /*
 128  * Name of the host we are connecting to.  This is the name given on the
 129  * command line, or the HostName specified for the user-supplied name in a
 130  * configuration file.
 131  */
 132 extern char *host;
 133
 134 /* Force TTY allocation */
 135 extern int force_tty_flag;
 136
 137 /*
 138  * Flag to indicate that we have received a window change signal which has
 139  * not yet been processed.  This will cause a message indicating the new
 140  * window size to be sent to the server a little later.  This is volatile
 141  * because this is updated in a signal handler.
 142  */
 143 static volatile sig_atomic_t received_window_change_signal = 0;
 144 static volatile sig_atomic_t received_signal = 0;
 145
 146 /* Flag indicating whether the user's terminal is in non-blocking mode. */
 147 static int in_non_blocking_mode = 0;
 148
 149 /* Common data for the client loop code. */
 150 volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
 151 static int escape_char1;        /* Escape character. (proto1 only) */
 152 static int escape_pending1;     /* Last character was an escape (proto1 only) */
 153 static int last_was_cr;         /* Last character was a newline. */
 154 static int exit_status;         /* Used to store the command exit status. */
 155 static int stdin_eof;           /* EOF has been encountered on stderr. */
 156 static Buffer stdin_buffer;     /* Buffer for stdin data. */
 157 static Buffer stdout_buffer;    /* Buffer for stdout data. */
 158 static Buffer stderr_buffer;    /* Buffer for stderr data. */
 159 static u_int buffer_high;/* Soft max buffer size. */
 160 static int connection_in;       /* Connection to server (input). */
 161 static int connection_out;      /* Connection to server (output). */
 162 static int need_rekeying;       /* Set to non-zero if rekeying is requested. */
 163 static int session_closed = 0;  /* In SSH2: login session closed. */
 164
 165 static void client_init_dispatch(void);
 166 int     session_ident = -1;
 167
 168 int     session_resumed = 0;
 169
 170 /* Track escape per proto2 channel */
 171 struct escape_filter_ctx {
 172         int escape_pending;
 173         int escape_char;
 174 };
 175
 176 /* Context for channel confirmation replies */
 177 struct channel_reply_ctx {
 178         const char *request_type;
 179         int id, do_close;
 180 };
 181
 182 /* Global request success/failure callbacks */
 183 struct global_confirm {
 184         TAILQ_ENTRY(global_confirm) entry;
 185         global_confirm_cb *cb;
 186         void *ctx;
 187         int ref_count;
 188 };
 189 TAILQ_HEAD(global_confirms, global_confirm);
 190 static struct global_confirms global_confirms =
 191     TAILQ_HEAD_INITIALIZER(global_confirms);
 192
 193 /*XXX*/
 194 extern Kex *xxx_kex;
 195
 196 void ssh_process_session2_setup(int, int, int, Buffer *);
 197
 198 /* Restores stdin to blocking mode. */
 199
 200 static void
 201 leave_non_blocking(void)
 202 {
 203         if (in_non_blocking_mode) {
 204                 unset_nonblock(fileno(stdin));
 205                 in_non_blocking_mode = 0;
 206         }
 207 }
 208
 209 /* Puts stdin terminal in non-blocking mode. */
 210
 211 static void
 212 enter_non_blocking(void)
 213 {
 214         in_non_blocking_mode = 1;
 215         set_nonblock(fileno(stdin));
 216 }
 217
 218 /*
 219  * Signal handler for the window change signal (SIGWINCH).  This just sets a
 220  * flag indicating that the window has changed.
 221  */
 222 /*ARGSUSED */
 223 static void
 224 window_change_handler(int sig)
 225 {
 226         received_window_change_signal = 1;
 227         signal(SIGWINCH, window_change_handler);
 228 }
 229
 230 /*
 231  * Signal handler for signals that cause the program to terminate.  These
 232  * signals must be trapped to restore terminal modes.
 233  */
 234 /*ARGSUSED */
 235 static void
 236 signal_handler(int sig)
 237 {
 238         received_signal = sig;
 239         quit_pending = 1;
 240 }
 241
 242 /*
 243  * Returns current time in seconds from Jan 1, 1970 with the maximum
 244  * available resolution.
 245  */
 246
 247 static double
 248 get_current_time(void)
 249 {
 250         struct timeval tv;
 251         gettimeofday(&tv, NULL);
 252         return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
 253 }
 254
 255 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
 256 void
 257 client_x11_get_proto(const char *display, const char *xauth_path,
 258     u_int trusted, char **_proto, char **_data)
 259 {
 260         char cmd[1024];
 261         char line[512];
 262         char xdisplay[512];
 263         static char proto[512], data[512];
 264         FILE *f;
 265         int got_data = 0, generated = 0, do_unlink = 0, i;
 266         char *xauthdir, *xauthfile;
 267         struct stat st;
 268
 269         xauthdir = xauthfile = NULL;
 270         *_proto = proto;
 271         *_data = data;
 272         proto[0] = data[0] = '\0';
 273
 274         if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
 275                 debug("No xauth program.");
 276         } else {
 277                 if (display == NULL) {
 278                         debug("x11_get_proto: DISPLAY not set");
 279                         return;
 280                 }
 281                 /*
 282                  * Handle FamilyLocal case where $DISPLAY does
 283                  * not match an authorization entry.  For this we
 284                  * just try "xauth list unix:displaynum.screennum".
 285                  * XXX: "localhost" match to determine FamilyLocal
 286                  *      is not perfect.
 287                  */
 288                 if (strncmp(display, "localhost:", 10) == 0) {
 289                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
 290                             display + 10);
 291                         display = xdisplay;
 292                 }
 293                 if (trusted == 0) {
 294                         xauthdir = xmalloc(MAXPATHLEN);
 295                         xauthfile = xmalloc(MAXPATHLEN);
 296                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
 297                         if (mkdtemp(xauthdir) != NULL) {
 298                                 do_unlink = 1;
 299                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
 300                                     xauthdir);
 301                                 snprintf(cmd, sizeof(cmd),
 302                                     "%s -f %s generate %s " SSH_X11_PROTO
 303                                     " untrusted timeout 1200 2>" _PATH_DEVNULL,
 304                                     xauth_path, xauthfile, display);
 305                                 debug2("x11_get_proto: %s", cmd);
 306                                 if (system(cmd) == 0)
 307                                         generated = 1;
 308                         }
 309                 }
 310
 311                 /*
 312                  * When in untrusted mode, we read the cookie only if it was
 313                  * successfully generated as an untrusted one in the step
 314                  * above.
 315                  */
 316                 if (trusted || generated) {
 317                         snprintf(cmd, sizeof(cmd),
 318                             "%s %s%s list %s 2>" _PATH_DEVNULL,
 319                             xauth_path,
 320                             generated ? "-f " : "" ,
 321                             generated ? xauthfile : "",
 322                             display);
 323                         debug2("x11_get_proto: %s", cmd);
 324                         f = popen(cmd, "r");
 325                         if (f && fgets(line, sizeof(line), f) &&
 326                             sscanf(line, "%*s %511s %511s", proto, data) == 2)
 327                                 got_data = 1;
 328                         if (f)
 329                                 pclose(f);
 330                 } else
 331                         error("Warning: untrusted X11 forwarding setup failed: "
 332                             "xauth key data not generated");
 333         }
 334
 335         if (do_unlink) {
 336                 unlink(xauthfile);
 337                 rmdir(xauthdir);
 338         }
 339         if (xauthdir)
 340                 xfree(xauthdir);
 341         if (xauthfile)
 342                 xfree(xauthfile);
 343
 344         /*
 345          * If we didn't get authentication data, just make up some
 346          * data.  The forwarding code will check the validity of the
 347          * response anyway, and substitute this data.  The X11
 348          * server, however, will ignore this fake data and use
 349          * whatever authentication mechanisms it was using otherwise
 350          * for the local connection.
 351          */
 352         if (!got_data) {
 353                 u_int32_t rnd = 0;
 354
 355                 logit("Warning: No xauth data; "
 356                     "using fake authentication data for X11 forwarding.");
 357                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
 358                 for (i = 0; i < 16; i++) {
 359                         if (i % 4 == 0)
 360                                 rnd = arc4random();
 361                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
 362                             rnd & 0xff);
 363                         rnd >>= 8;
 364                 }
 365         }
 366 }
 367
 368 /*
 369  * This is called when the interactive is entered.  This checks if there is
 370  * an EOF coming on stdin.  We must check this explicitly, as select() does
 371  * not appear to wake up when redirecting from /dev/null.
 372  */
 373
 374 static void
 375 client_check_initial_eof_on_stdin(void)
 376 {
 377         int len;
 378         char buf[1];
 379
 380         /*
 381          * If standard input is to be "redirected from /dev/null", we simply
 382          * mark that we have seen an EOF and send an EOF message to the
 383          * server. Otherwise, we try to read a single character; it appears
 384          * that for some files, such /dev/null, select() never wakes up for
 385          * read for this descriptor, which means that we never get EOF.  This
 386          * way we will get the EOF if stdin comes from /dev/null or similar.
 387          */
 388         if (stdin_null_flag) {
 389                 /* Fake EOF on stdin. */
 390                 debug("Sending eof.");
 391                 stdin_eof = 1;
 392                 packet_start(SSH_CMSG_EOF);
 393                 packet_send();
 394         } else {
 395                 enter_non_blocking();
 396
 397                 /* Check for immediate EOF on stdin. */
 398                 len = read(fileno(stdin), buf, 1);
 399                 if (len == 0) {
 400                         /*
 401                          * EOF.  Record that we have seen it and send
 402                          * EOF to server.
 403                          */
 404                         debug("Sending eof.");
 405                         stdin_eof = 1;
 406                         packet_start(SSH_CMSG_EOF);
 407                         packet_send();
 408                 } else if (len > 0) {
 409                         /*
 410                          * Got data.  We must store the data in the buffer,
 411                          * and also process it as an escape character if
 412                          * appropriate.
 413                          */
 414                         if ((u_char) buf[0] == escape_char1)
 415                                 escape_pending1 = 1;
 416                         else
 417                                 buffer_append(&stdin_buffer, buf, 1);
 418                 }
 419                 leave_non_blocking();
 420         }
 421 }
 422
 423
 424 /*
 425  * Make packets from buffered stdin data, and buffer them for sending to the
 426  * connection.
 427  */
 428
 429 static void
 430 client_make_packets_from_stdin_data(void)
 431 {
 432         u_int len;
 433
 434         /* Send buffered stdin data to the server. */
 435         while (buffer_len(&stdin_buffer) > 0 &&
 436             packet_not_very_much_data_to_write()) {
 437                 len = buffer_len(&stdin_buffer);
 438                 /* Keep the packets at reasonable size. */
 439                 if (len > packet_get_maxsize())
 440                         len = packet_get_maxsize();
 441                 packet_start(SSH_CMSG_STDIN_DATA);
 442                 packet_put_string(buffer_ptr(&stdin_buffer), len);
 443                 packet_send();
 444                 buffer_consume(&stdin_buffer, len);
 445                 /* If we have a pending EOF, send it now. */
 446                 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
 447                         packet_start(SSH_CMSG_EOF);
 448                         packet_send();
 449                 }
 450         }
 451 }
 452
 453 /*
 454  * Checks if the client window has changed, and sends a packet about it to
 455  * the server if so.  The actual change is detected elsewhere (by a software
 456  * interrupt on Unix); this just checks the flag and sends a message if
 457  * appropriate.
 458  */
 459
 460 static void
 461 client_check_window_change(void)
 462 {
 463         struct winsize ws;
 464
 465         if (! received_window_change_signal)
 466                 return;
 467         /** XXX race */
 468         received_window_change_signal = 0;
 469
 470         debug2("client_check_window_change: changed");
 471
 472         if (compat20) {
 473                 channel_send_window_changes();
 474         } else {
 475                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
 476                         return;
 477                 packet_start(SSH_CMSG_WINDOW_SIZE);
 478                 packet_put_int((u_int)ws.ws_row);
 479                 packet_put_int((u_int)ws.ws_col);
 480                 packet_put_int((u_int)ws.ws_xpixel);
 481                 packet_put_int((u_int)ws.ws_ypixel);
 482                 packet_send();
 483         }
 484 }
 485
 486 static void
 487 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
 488 {
 489         struct global_confirm *gc;
 490
 491         if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
 492                 return;
 493         if (gc->cb != NULL)
 494                 gc->cb(type, seq, gc->ctx);
 495         if (--gc->ref_count <= 0) {
 496                 TAILQ_REMOVE(&global_confirms, gc, entry);
 497                 bzero(gc, sizeof(*gc));
 498                 xfree(gc);
 499         }
 500
 501         packet_set_alive_timeouts(0);
 502 }
 503
 504 static void
 505 server_alive_check(void)
 506 {
 507         if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
 508                 logit("Timeout, server not responding.");
 509                 cleanup_exit(255);
 510         }
 511         packet_start(SSH2_MSG_GLOBAL_REQUEST);
 512         packet_put_cstring("keepalive@openssh.com");
 513         packet_put_char(1);     /* boolean: want reply */
 514         packet_send();
 515         /* Insert an empty placeholder to maintain ordering */
 516         client_register_global_confirm(NULL, NULL);
 517 }
 518
 519 /*
 520  * Waits until the client can do something (some data becomes available on
 521  * one of the file descriptors).
 522  */
 523 static void
 524 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
 525     int *maxfdp, u_int *nallocp, int rekeying)
 526 {
 527         struct timeval tv, *tvp;
 528         int ret;
 529
 530         /* Add any selections by the channel mechanism. */
 531         channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
 532
 533         if (!compat20) {
 534                 /* Read from the connection, unless our buffers are full. */
 535                 if (buffer_len(&stdout_buffer) < buffer_high &&
 536                     buffer_len(&stderr_buffer) < buffer_high &&
 537                     channel_not_very_much_buffered_data())
 538                         FD_SET(connection_in, *readsetp);
 539                 /*
 540                  * Read from stdin, unless we have seen EOF or have very much
 541                  * buffered data to send to the server.
 542                  */
 543                 if (!stdin_eof && packet_not_very_much_data_to_write())
 544                         FD_SET(fileno(stdin), *readsetp);
 545
 546                 /* Select stdout/stderr if have data in buffer. */
 547                 if (buffer_len(&stdout_buffer) > 0)
 548                         FD_SET(fileno(stdout), *writesetp);
 549                 if (buffer_len(&stderr_buffer) > 0)
 550                         FD_SET(fileno(stderr), *writesetp);
 551         } else {
 552                 /* channel_prepare_select could have closed the last channel */
 553                 if (session_closed && !channel_still_open() &&
 554                     !packet_have_data_to_write()) {
 555                         /* clear mask since we did not call select() */
 556                         memset(*readsetp, 0, *nallocp);
 557                         memset(*writesetp, 0, *nallocp);
 558                         return;
 559                 } else {
 560                         FD_SET(connection_in, *readsetp);
 561                 }
 562         }
 563
 564         /* Select server connection if have data to write to the server. */
 565         if (packet_have_data_to_write())
 566                 FD_SET(connection_out, *writesetp);
 567
 568         /*
 569          * Wait for something to happen.  This will suspend the process until
 570          * some selected descriptor can be read, written, or has some other
 571          * event pending.
 572          */
 573
 574         if (options.server_alive_interval == 0 || !compat20)
 575                 tvp = NULL;
 576         else {
 577                 tv.tv_sec = options.server_alive_interval;
 578                 tv.tv_usec = 0;
 579                 tvp = &tv;
 580         }
 581         ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
 582         if (ret < 0) {
 583                 char buf[100];
 584
 585                 /*
 586                  * We have to clear the select masks, because we return.
 587                  * We have to return, because the mainloop checks for the flags
 588                  * set by the signal handlers.
 589                  */
 590                 memset(*readsetp, 0, *nallocp);
 591                 memset(*writesetp, 0, *nallocp);
 592
 593                 if (errno == EINTR)
 594                         return;
 595                 /* Note: we might still have data in the buffers. */
 596                 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
 597                 buffer_append(&stderr_buffer, buf, strlen(buf));
 598                 quit_pending = 1;
 599         } else if (ret == 0)
 600                 server_alive_check();
 601 }
 602
 603 static void
 604 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
 605 {
 606         /* Flush stdout and stderr buffers. */
 607         if (buffer_len(bout) > 0)
 608                 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
 609                     buffer_len(bout));
 610         if (buffer_len(berr) > 0)
 611                 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
 612                     buffer_len(berr));
 613
 614         leave_raw_mode(force_tty_flag);
 615
 616         /*
 617          * Free (and clear) the buffer to reduce the amount of data that gets
 618          * written to swap.
 619          */
 620         buffer_free(bin);
 621         buffer_free(bout);
 622         buffer_free(berr);
 623
 624         /* Send the suspend signal to the program itself. */
 625         kill(getpid(), SIGTSTP);
 626
 627         /* Reset window sizes in case they have changed */
 628         received_window_change_signal = 1;
 629
 630         /* OK, we have been continued by the user. Reinitialize buffers. */
 631         buffer_init(bin);
 632         buffer_init(bout);
 633         buffer_init(berr);
 634
 635         enter_raw_mode(force_tty_flag);
 636 }
 637
 638 static void
 639 client_process_net_input(fd_set *readset)
 640 {
 641         int len, cont = 0;
 642         char buf[SSH_IOBUFSZ];
 643
 644         /*
 645          * Read input from the server, and add any such data to the buffer of
 646          * the packet subsystem.
 647          */
 648         if (FD_ISSET(connection_in, readset)) {
 649                 /* Read as much as possible. */
 650                 len = roaming_read(connection_in, buf, sizeof(buf), &cont);
 651                 if (len == 0 && cont == 0) {
 652                         /*
 653                          * Received EOF.  The remote host has closed the
 654                          * connection.
 655                          */
 656                         snprintf(buf, sizeof buf,
 657                             "Connection to %.300s closed by remote host.\r\n",
 658                             host);
 659                         buffer_append(&stderr_buffer, buf, strlen(buf));
 660                         quit_pending = 1;
 661                         return;
 662                 }
 663                 /*
 664                  * There is a kernel bug on Solaris that causes select to
 665                  * sometimes wake up even though there is no data available.
 666                  */
 667                 if (len < 0 &&
 668                     (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
 669                         len = 0;
 670
 671                 if (len < 0) {
 672                         /*
 673                          * An error has encountered.  Perhaps there is a
 674                          * network problem.
 675                          */
 676                         snprintf(buf, sizeof buf,
 677                             "Read from remote host %.300s: %.100s\r\n",
 678                             host, strerror(errno));
 679                         buffer_append(&stderr_buffer, buf, strlen(buf));
 680                         quit_pending = 1;
 681                         return;
 682                 }
 683                 packet_process_incoming(buf, len);
 684         }
 685 }
 686
 687 static void
 688 client_status_confirm(int type, Channel *c, void *ctx)
 689 {
 690         struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
 691         char errmsg[256];
 692         int tochan;
 693
 694         /* XXX supress on mux _client_ quietmode */
 695         tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
 696             c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
 697
 698         if (type == SSH2_MSG_CHANNEL_SUCCESS) {
 699                 debug2("%s request accepted on channel %d",
 700                     cr->request_type, c->self);
 701         } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
 702                 if (tochan) {
 703                         snprintf(errmsg, sizeof(errmsg),
 704                             "%s request failed\r\n", cr->request_type);
 705                 } else {
 706                         snprintf(errmsg, sizeof(errmsg),
 707                             "%s request failed on channel %d",
 708                             cr->request_type, c->self);
 709                 }
 710                 /* If error occurred on primary session channel, then exit */
 711                 if (cr->do_close && c->self == session_ident)
 712                         fatal("%s", errmsg);
 713                 /* If error occurred on mux client, append to their stderr */
 714                 if (tochan)
 715                         buffer_append(&c->extended, errmsg, strlen(errmsg));
 716                 else
 717                         error("%s", errmsg);
 718                 if (cr->do_close) {
 719                         chan_read_failed(c);
 720                         chan_write_failed(c);
 721                 }
 722         }
 723         xfree(cr);
 724 }
 725
 726 static void
 727 client_abandon_status_confirm(Channel *c, void *ctx)
 728 {
 729         xfree(ctx);
 730 }
 731
 732 static void
 733 client_expect_confirm(int id, const char *request, int do_close)
 734 {
 735         struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
 736
 737         cr->request_type = request;
 738         cr->do_close = do_close;
 739
 740         channel_register_status_confirm(id, client_status_confirm,
 741             client_abandon_status_confirm, cr);
 742 }
 743
 744 void
 745 client_register_global_confirm(global_confirm_cb *cb, void *ctx)
 746 {
 747         struct global_confirm *gc, *last_gc;
 748
 749         /* Coalesce identical callbacks */
 750         last_gc = TAILQ_LAST(&global_confirms, global_confirms);
 751         if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
 752                 if (++last_gc->ref_count >= INT_MAX)
 753                         fatal("%s: last_gc->ref_count = %d",
 754                             __func__, last_gc->ref_count);
 755                 return;
 756         }
 757
 758         gc = xmalloc(sizeof(*gc));
 759         gc->cb = cb;
 760         gc->ctx = ctx;
 761         gc->ref_count = 1;
 762         TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
 763 }
 764
 765 static void
 766 process_cmdline(void)
 767 {
 768         void (*handler)(int);
 769         char *s, *cmd, *cancel_host;
 770         int delete = 0;
 771         int local = 0, remote = 0, dynamic = 0;
 772         int cancel_port;
 773         Forward fwd;
 774
 775         bzero(&fwd, sizeof(fwd));
 776         fwd.listen_host = fwd.connect_host = NULL;
 777
 778         leave_raw_mode(force_tty_flag);
 779         handler = signal(SIGINT, SIG_IGN);
 780         cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
 781         if (s == NULL)
 782                 goto out;
 783         while (isspace(*s))
 784                 s++;
 785         if (*s == '-')
 786                 s++;    /* Skip cmdline '-', if any */
 787         if (*s == '\0')
 788                 goto out;
 789
 790         if (*s == 'h' || *s == 'H' || *s == '?') {
 791                 logit("Commands:");
 792                 logit("      -L[bind_address:]port:host:hostport    "
 793                     "Request local forward");
 794                 logit("      -R[bind_address:]port:host:hostport    "
 795                     "Request remote forward");
 796                 logit("      -D[bind_address:]port                  "
 797                     "Request dynamic forward");
 798                 logit("      -KR[bind_address:]port                 "
 799                     "Cancel remote forward");
 800                 if (!options.permit_local_command)
 801                         goto out;
 802                 logit("      !args                                  "
 803                     "Execute local command");
 804                 goto out;
 805         }
 806
 807         if (*s == '!' && options.permit_local_command) {
 808                 s++;
 809                 ssh_local_cmd(s);
 810                 goto out;
 811         }
 812
 813         if (*s == 'K') {
 814                 delete = 1;
 815                 s++;
 816         }
 817         if (*s == 'L')
 818                 local = 1;
 819         else if (*s == 'R')
 820                 remote = 1;
 821         else if (*s == 'D')
 822                 dynamic = 1;
 823         else {
 824                 logit("Invalid command.");
 825                 goto out;
 826         }
 827
 828         if ((local || dynamic) && delete) {
 829                 logit("Not supported.");
 830                 goto out;
 831         }
 832         if (remote && delete && !compat20) {
 833                 logit("Not supported for SSH protocol version 1.");
 834                 goto out;
 835         }
 836
 837         while (isspace(*++s))
 838                 ;
 839
 840         /* XXX update list of forwards in options */
 841         if (delete) {
 842                 cancel_port = 0;
 843                 cancel_host = hpdelim(&s);      /* may be NULL */
 844                 if (s != NULL) {
 845                         cancel_port = a2port(s);
 846                         cancel_host = cleanhostname(cancel_host);
 847                 } else {
 848                         cancel_port = a2port(cancel_host);
 849                         cancel_host = NULL;
 850                 }
 851                 if (cancel_port <= 0) {
 852                         logit("Bad forwarding close port");
 853                         goto out;
 854                 }
 855                 channel_request_rforward_cancel(cancel_host, cancel_port);
 856         } else {
 857                 if (!parse_forward(&fwd, s, dynamic, remote)) {
 858                         logit("Bad forwarding specification.");
 859                         goto out;
 860                 }
 861                 if (local || dynamic) {
 862                         if (channel_setup_local_fwd_listener(fwd.listen_host,
 863                             fwd.listen_port, fwd.connect_host,
 864                             fwd.connect_port, options.gateway_ports) < 0) {
 865                                 logit("Port forwarding failed.");
 866                                 goto out;
 867                         }
 868                 } else {
 869                         if (channel_request_remote_forwarding(fwd.listen_host,
 870                             fwd.listen_port, fwd.connect_host,
 871                             fwd.connect_port) < 0) {
 872                                 logit("Port forwarding failed.");
 873                                 goto out;
 874                         }
 875                 }
 876
 877                 logit("Forwarding port.");
 878         }
 879
 880 out:
 881         signal(SIGINT, handler);
 882         enter_raw_mode(force_tty_flag);
 883         if (cmd)
 884                 xfree(cmd);
 885         if (fwd.listen_host != NULL)
 886                 xfree(fwd.listen_host);
 887         if (fwd.connect_host != NULL)
 888                 xfree(fwd.connect_host);
 889 }
 890
 891 /*
 892  * Process the characters one by one, call with c==NULL for proto1 case.
 893  */
 894 static int
 895 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
 896     char *buf, int len)
 897 {
 898         char string[1024];
 899         pid_t pid;
 900         int bytes = 0;
 901         u_int i;
 902         u_char ch;
 903         char *s;
 904         int *escape_pendingp, escape_char;
 905         struct escape_filter_ctx *efc;
 906
 907         if (c == NULL) {
 908                 escape_pendingp = &escape_pending1;
 909                 escape_char = escape_char1;
 910         } else {
 911                 if (c->filter_ctx == NULL)
 912                         return 0;
 913                 efc = (struct escape_filter_ctx *)c->filter_ctx;
 914                 escape_pendingp = &efc->escape_pending;
 915                 escape_char = efc->escape_char;
 916         }
 917
 918         if (len <= 0)
 919                 return (0);
 920
 921         for (i = 0; i < (u_int)len; i++) {
 922                 /* Get one character at a time. */
 923                 ch = buf[i];
 924
 925                 if (*escape_pendingp) {
 926                         /* We have previously seen an escape character. */
 927                         /* Clear the flag now. */
 928                         *escape_pendingp = 0;
 929
 930                         /* Process the escaped character. */
 931                         switch (ch) {
 932                         case '.':
 933                                 /* Terminate the connection. */
 934                                 snprintf(string, sizeof string, "%c.\r\n",
 935                                     escape_char);
 936                                 buffer_append(berr, string, strlen(string));
 937
 938                                 if (c && c->ctl_chan != -1) {
 939                                         chan_read_failed(c);
 940                                         chan_write_failed(c);
 941                                         return 0;
 942                                 } else
 943                                         quit_pending = 1;
 944                                 return -1;
 945
 946                         case 'Z' - 64:
 947                                 /* XXX support this for mux clients */
 948                                 if (c && c->ctl_chan != -1) {
 949  noescape:
 950                                         snprintf(string, sizeof string,
 951                                             "%c%c escape not available to "
 952                                             "multiplexed sessions\r\n",
 953                                             escape_char, ch);
 954                                         buffer_append(berr, string,
 955                                             strlen(string));
 956                                         continue;
 957                                 }
 958                                 /* Suspend the program. Inform the user */
 959                                 snprintf(string, sizeof string,
 960                                     "%c^Z [suspend ssh]\r\n", escape_char);
 961                                 buffer_append(berr, string, strlen(string));
 962
 963                                 /* Restore terminal modes and suspend. */
 964                                 client_suspend_self(bin, bout, berr);
 965
 966                                 /* We have been continued. */
 967                                 continue;
 968
 969                         case 'B':
 970                                 if (compat20) {
 971                                         snprintf(string, sizeof string,
 972                                             "%cB\r\n", escape_char);
 973                                         buffer_append(berr, string,
 974                                             strlen(string));
 975                                         channel_request_start(session_ident,
 976                                             "break", 0);
 977                                         packet_put_int(1000);
 978                                         packet_send();
 979                                 }
 980                                 continue;
 981
 982                         case 'R':
 983                                 if (compat20) {
 984                                         if (datafellows & SSH_BUG_NOREKEY)
 985                                                 logit("Server does not "
 986                                                     "support re-keying");
 987                                         else
 988                                                 need_rekeying = 1;
 989                                 }
 990                                 continue;
 991
 992                         case '&':
 993                                 if (c && c->ctl_chan != -1)
 994                                         goto noescape;
 995                                 /*
 996                                  * Detach the program (continue to serve
 997                                  * connections, but put in background and no
 998                                  * more new connections).
 999                                  */
1000                                 /* Restore tty modes. */
1001                                 leave_raw_mode(force_tty_flag);
1002
1003                                 /* Stop listening for new connections. */
1004                                 channel_stop_listening();
1005
1006                                 snprintf(string, sizeof string,
1007                                     "%c& [backgrounded]\n", escape_char);
1008                                 buffer_append(berr, string, strlen(string));
1009
1010                                 /* Fork into background. */
1011                                 pid = fork();
1012                                 if (pid < 0) {
1013                                         error("fork: %.100s", strerror(errno));
1014                                         continue;
1015                                 }
1016                                 if (pid != 0) { /* This is the parent. */
1017                                         /* The parent just exits. */
1018                                         exit(0);
1019                                 }
1020                                 /* The child continues serving connections. */
1021                                 if (compat20) {
1022                                         buffer_append(bin, "\004", 1);
1023                                         /* fake EOF on stdin */
1024                                         return -1;
1025                                 } else if (!stdin_eof) {
1026                                         /*
1027                                          * Sending SSH_CMSG_EOF alone does not
1028                                          * always appear to be enough.  So we
1029                                          * try to send an EOF character first.
1030                                          */
1031                                         packet_start(SSH_CMSG_STDIN_DATA);
1032                                         packet_put_string("\004", 1);
1033                                         packet_send();
1034                                         /* Close stdin. */
1035                                         stdin_eof = 1;
1036                                         if (buffer_len(bin) == 0) {
1037                                                 packet_start(SSH_CMSG_EOF);
1038                                                 packet_send();
1039                                         }
1040                                 }
1041                                 continue;
1042
1043                         case '?':
1044                                 if (c && c->ctl_chan != -1) {
1045                                         snprintf(string, sizeof string,
1046 "%c?\r\n\
1047 Supported escape sequences:\r\n\
1048   %c.  - terminate session\r\n\
1049   %cB  - send a BREAK to the remote system\r\n\
1050   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1051   %c#  - list forwarded connections\r\n\
1052   %c?  - this message\r\n\
1053   %c%c  - send the escape character by typing it twice\r\n\
1054 (Note that escapes are only recognized immediately after newline.)\r\n",
1055                                             escape_char, escape_char,
1056                                             escape_char, escape_char,
1057                                             escape_char, escape_char,
1058                                             escape_char, escape_char);
1059                                 } else {
1060                                         snprintf(string, sizeof string,
1061 "%c?\r\n\
1062 Supported escape sequences:\r\n\
1063   %c.  - terminate connection (and any multiplexed sessions)\r\n\
1064   %cB  - send a BREAK to the remote system\r\n\
1065   %cC  - open a command line\r\n\
1066   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1067   %c^Z - suspend ssh\r\n\
1068   %c#  - list forwarded connections\r\n\
1069   %c&  - background ssh (when waiting for connections to terminate)\r\n\
1070   %c?  - this message\r\n\
1071   %c%c  - send the escape character by typing it twice\r\n\
1072 (Note that escapes are only recognized immediately after newline.)\r\n",
1073                                             escape_char, escape_char,
1074                                             escape_char, escape_char,
1075                                             escape_char, escape_char,
1076                                             escape_char, escape_char,
1077                                             escape_char, escape_char,
1078                                             escape_char);
1079                                 }
1080                                 buffer_append(berr, string, strlen(string));
1081                                 continue;
1082
1083                         case '#':
1084                                 snprintf(string, sizeof string, "%c#\r\n",
1085                                     escape_char);
1086                                 buffer_append(berr, string, strlen(string));
1087                                 s = channel_open_message();
1088                                 buffer_append(berr, s, strlen(s));
1089                                 xfree(s);
1090                                 continue;
1091
1092                         case 'C':
1093                                 if (c && c->ctl_chan != -1)
1094                                         goto noescape;
1095                                 process_cmdline();
1096                                 continue;
1097
1098                         default:
1099                                 if (ch != escape_char) {
1100                                         buffer_put_char(bin, escape_char);
1101                                         bytes++;
1102                                 }
1103                                 /* Escaped characters fall through here */
1104                                 break;
1105                         }
1106                 } else {
1107                         /*
1108                          * The previous character was not an escape char.
1109                          * Check if this is an escape.
1110                          */
1111                         if (last_was_cr && ch == escape_char) {
1112                                 /*
1113                                  * It is. Set the flag and continue to
1114                                  * next character.
1115                                  */
1116                                 *escape_pendingp = 1;
1117                                 continue;
1118                         }
1119                 }
1120
1121                 /*
1122                  * Normal character.  Record whether it was a newline,
1123                  * and append it to the buffer.
1124                  */
1125                 last_was_cr = (ch == '\r' || ch == '\n');
1126                 buffer_put_char(bin, ch);
1127                 bytes++;
1128         }
1129         return bytes;
1130 }
1131
1132 static void
1133 client_process_input(fd_set *readset)
1134 {
1135         int len;
1136         char buf[SSH_IOBUFSZ];
1137
1138         /* Read input from stdin. */
1139         if (FD_ISSET(fileno(stdin), readset)) {
1140                 /* Read as much as possible. */
1141                 len = read(fileno(stdin), buf, sizeof(buf));
1142                 if (len < 0 &&
1143                     (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
1144                         return;         /* we'll try again later */
1145                 if (len <= 0) {
1146                         /*
1147                          * Received EOF or error.  They are treated
1148                          * similarly, except that an error message is printed
1149                          * if it was an error condition.
1150                          */
1151                         if (len < 0) {
1152                                 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1153                                     strerror(errno));
1154                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1155                         }
1156                         /* Mark that we have seen EOF. */
1157                         stdin_eof = 1;
1158                         /*
1159                          * Send an EOF message to the server unless there is
1160                          * data in the buffer.  If there is data in the
1161                          * buffer, no message will be sent now.  Code
1162                          * elsewhere will send the EOF when the buffer
1163                          * becomes empty if stdin_eof is set.
1164                          */
1165                         if (buffer_len(&stdin_buffer) == 0) {
1166                                 packet_start(SSH_CMSG_EOF);
1167                                 packet_send();
1168                         }
1169                 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1170                         /*
1171                          * Normal successful read, and no escape character.
1172                          * Just append the data to buffer.
1173                          */
1174                         buffer_append(&stdin_buffer, buf, len);
1175                 } else {
1176                         /*
1177                          * Normal, successful read.  But we have an escape
1178                          * character and have to process the characters one
1179                          * by one.
1180                          */
1181                         if (process_escapes(NULL, &stdin_buffer,
1182                             &stdout_buffer, &stderr_buffer, buf, len) == -1)
1183                                 return;
1184                 }
1185         }
1186 }
1187
1188 static void
1189 client_process_output(fd_set *writeset)
1190 {
1191         int len;
1192         char buf[100];
1193
1194         /* Write buffered output to stdout. */
1195         if (FD_ISSET(fileno(stdout), writeset)) {
1196                 /* Write as much data as possible. */
1197                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1198                     buffer_len(&stdout_buffer));
1199                 if (len <= 0) {
1200                         if (errno == EINTR || errno == EAGAIN ||
1201                             errno == EWOULDBLOCK)
1202                                 len = 0;
1203                         else {
1204                                 /*
1205                                  * An error or EOF was encountered.  Put an
1206                                  * error message to stderr buffer.
1207                                  */
1208                                 snprintf(buf, sizeof buf,
1209                                     "write stdout: %.50s\r\n", strerror(errno));
1210                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1211                                 quit_pending = 1;
1212                                 return;
1213                         }
1214                 }
1215                 /* Consume printed data from the buffer. */
1216                 buffer_consume(&stdout_buffer, len);
1217         }
1218         /* Write buffered output to stderr. */
1219         if (FD_ISSET(fileno(stderr), writeset)) {
1220                 /* Write as much data as possible. */
1221                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1222                     buffer_len(&stderr_buffer));
1223                 if (len <= 0) {
1224                         if (errno == EINTR || errno == EAGAIN ||
1225                             errno == EWOULDBLOCK)
1226                                 len = 0;
1227                         else {
1228                                 /*
1229                                  * EOF or error, but can't even print
1230                                  * error message.
1231                                  */
1232                                 quit_pending = 1;
1233                                 return;
1234                         }
1235                 }
1236                 /* Consume printed characters from the buffer. */
1237                 buffer_consume(&stderr_buffer, len);
1238         }
1239 }
1240
1241 /*
1242  * Get packets from the connection input buffer, and process them as long as
1243  * there are packets available.
1244  *
1245  * Any unknown packets received during the actual
1246  * session cause the session to terminate.  This is
1247  * intended to make debugging easier since no
1248  * confirmations are sent.  Any compatible protocol
1249  * extensions must be negotiated during the
1250  * preparatory phase.
1251  */
1252
1253 static void
1254 client_process_buffered_input_packets(void)
1255 {
1256         dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1257             compat20 ? xxx_kex : NULL);
1258 }
1259
1260 /* scan buf[] for '~' before sending data to the peer */
1261
1262 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1263 void *
1264 client_new_escape_filter_ctx(int escape_char)
1265 {
1266         struct escape_filter_ctx *ret;
1267
1268         ret = xmalloc(sizeof(*ret));
1269         ret->escape_pending = 0;
1270         ret->escape_char = escape_char;
1271         return (void *)ret;
1272 }
1273
1274 /* Free the escape filter context on channel free */
1275 void
1276 client_filter_cleanup(int cid, void *ctx)
1277 {
1278         xfree(ctx);
1279 }
1280
1281 int
1282 client_simple_escape_filter(Channel *c, char *buf, int len)
1283 {
1284         if (c->extended_usage != CHAN_EXTENDED_WRITE)
1285                 return 0;
1286
1287         return process_escapes(c, &c->input, &c->output, &c->extended,
1288             buf, len);
1289 }
1290
1291 static void
1292 client_channel_closed(int id, void *arg)
1293 {
1294         channel_cancel_cleanup(id);
1295         session_closed = 1;
1296         leave_raw_mode(force_tty_flag);
1297 }
1298
1299 /*
1300  * Implements the interactive session with the server.  This is called after
1301  * the user has been authenticated, and a command has been started on the
1302  * remote host.  If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1303  * used as an escape character for terminating or suspending the session.
1304  */
1305
1306 int
1307 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1308 {
1309         fd_set *readset = NULL, *writeset = NULL;
1310         double start_time, total_time;
1311         int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1312         u_int64_t ibytes, obytes;
1313         u_int nalloc = 0;
1314         char buf[100];
1315
1316         debug("Entering interactive session.");
1317
1318         start_time = get_current_time();
1319
1320         /* Initialize variables. */
1321         escape_pending1 = 0;
1322         last_was_cr = 1;
1323         exit_status = -1;
1324         stdin_eof = 0;
1325         buffer_high = 64 * 1024;
1326         connection_in = packet_get_connection_in();
1327         connection_out = packet_get_connection_out();
1328         max_fd = MAX(connection_in, connection_out);
1329
1330         if (!compat20) {
1331                 /* enable nonblocking unless tty */
1332                 if (!isatty(fileno(stdin)))
1333                         set_nonblock(fileno(stdin));
1334                 if (!isatty(fileno(stdout)))
1335                         set_nonblock(fileno(stdout));
1336                 if (!isatty(fileno(stderr)))
1337                         set_nonblock(fileno(stderr));
1338                 max_fd = MAX(max_fd, fileno(stdin));
1339                 max_fd = MAX(max_fd, fileno(stdout));
1340                 max_fd = MAX(max_fd, fileno(stderr));
1341         }
1342         quit_pending = 0;
1343         escape_char1 = escape_char_arg;
1344
1345         /* Initialize buffers. */
1346         buffer_init(&stdin_buffer);
1347         buffer_init(&stdout_buffer);
1348         buffer_init(&stderr_buffer);
1349
1350         client_init_dispatch();
1351
1352         /*
1353          * Set signal handlers, (e.g. to restore non-blocking mode)
1354          * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1355          */
1356         if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1357                 signal(SIGHUP, signal_handler);
1358         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1359                 signal(SIGINT, signal_handler);
1360         if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1361                 signal(SIGQUIT, signal_handler);
1362         if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1363                 signal(SIGTERM, signal_handler);
1364         signal(SIGWINCH, window_change_handler);
1365
1366         if (have_pty)
1367                 enter_raw_mode(force_tty_flag);
1368
1369         if (compat20) {
1370                 session_ident = ssh2_chan_id;
1371                 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1372                         channel_register_filter(session_ident,
1373                             client_simple_escape_filter, NULL,
1374                             client_filter_cleanup,
1375                             client_new_escape_filter_ctx(escape_char_arg));
1376                 if (session_ident != -1)
1377                         channel_register_cleanup(session_ident,
1378                             client_channel_closed, 0);
1379         } else {
1380                 /* Check if we should immediately send eof on stdin. */
1381                 client_check_initial_eof_on_stdin();
1382         }
1383
1384         /* Main loop of the client for the interactive session mode. */
1385         while (!quit_pending) {
1386
1387                 /* Process buffered packets sent by the server. */
1388                 client_process_buffered_input_packets();
1389
1390                 if (compat20 && session_closed && !channel_still_open())
1391                         break;
1392
1393                 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1394
1395                 if (rekeying) {
1396                         debug("rekeying in progress");
1397                 } else {
1398                         /*
1399                          * Make packets of buffered stdin data, and buffer
1400                          * them for sending to the server.
1401                          */
1402                         if (!compat20)
1403                                 client_make_packets_from_stdin_data();
1404
1405                         /*
1406                          * Make packets from buffered channel data, and
1407                          * enqueue them for sending to the server.
1408                          */
1409                         if (packet_not_very_much_data_to_write())
1410                                 channel_output_poll();
1411
1412                         /*
1413                          * Check if the window size has changed, and buffer a
1414                          * message about it to the server if so.
1415                          */
1416                         client_check_window_change();
1417
1418                         if (quit_pending)
1419                                 break;
1420                 }
1421                 /*
1422                  * Wait until we have something to do (something becomes
1423                  * available on one of the descriptors).
1424                  */
1425                 max_fd2 = max_fd;
1426                 client_wait_until_can_do_something(&readset, &writeset,
1427                     &max_fd2, &nalloc, rekeying);
1428
1429                 if (quit_pending)
1430                         break;
1431
1432                 /* Do channel operations unless rekeying in progress. */
1433                 if (!rekeying) {
1434                         channel_after_select(readset, writeset);
1435                         if (need_rekeying || packet_need_rekeying()) {
1436                                 debug("need rekeying");
1437                                 xxx_kex->done = 0;
1438                                 kex_send_kexinit(xxx_kex);
1439                                 need_rekeying = 0;
1440                         }
1441                 }
1442
1443                 /* Buffer input from the connection.  */
1444                 client_process_net_input(readset);
1445
1446                 if (quit_pending)
1447                         break;
1448
1449                 if (!compat20) {
1450                         /* Buffer data from stdin */
1451                         client_process_input(readset);
1452                         /*
1453                          * Process output to stdout and stderr.  Output to
1454                          * the connection is processed elsewhere (above).
1455                          */
1456                         client_process_output(writeset);
1457                 }
1458
1459                 if (session_resumed) {
1460                         connection_in = packet_get_connection_in();
1461                         connection_out = packet_get_connection_out();
1462                         max_fd = MAX(max_fd, connection_out);
1463                         max_fd = MAX(max_fd, connection_in);
1464                         session_resumed = 0;
1465                 }
1466
1467                 /*
1468                  * Send as much buffered packet data as possible to the
1469                  * sender.
1470                  */
1471                 if (FD_ISSET(connection_out, writeset))
1472                         packet_write_poll();
1473         }
1474         if (readset)
1475                 xfree(readset);
1476         if (writeset)
1477                 xfree(writeset);
1478
1479         /* Terminate the session. */
1480
1481         /* Stop watching for window change. */
1482         signal(SIGWINCH, SIG_DFL);
1483
1484         if (compat20) {
1485                 packet_start(SSH2_MSG_DISCONNECT);
1486                 packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1487                 packet_put_cstring("disconnected by user");
1488                 packet_send();
1489                 packet_write_wait();
1490         }
1491
1492         channel_free_all();
1493
1494         if (have_pty)
1495                 leave_raw_mode(force_tty_flag);
1496
1497         /* restore blocking io */
1498         if (!isatty(fileno(stdin)))
1499                 unset_nonblock(fileno(stdin));
1500         if (!isatty(fileno(stdout)))
1501                 unset_nonblock(fileno(stdout));
1502         if (!isatty(fileno(stderr)))
1503                 unset_nonblock(fileno(stderr));
1504
1505         /*
1506          * If there was no shell or command requested, there will be no remote
1507          * exit status to be returned.  In that case, clear error code if the
1508          * connection was deliberately terminated at this end.
1509          */
1510         if (no_shell_flag && received_signal == SIGTERM) {
1511                 received_signal = 0;
1512                 exit_status = 0;
1513         }
1514
1515         if (received_signal)
1516                 fatal("Killed by signal %d.", (int) received_signal);
1517
1518         /*
1519          * In interactive mode (with pseudo tty) display a message indicating
1520          * that the connection has been closed.
1521          */
1522         if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1523                 snprintf(buf, sizeof buf,
1524                     "Connection to %.64s closed.\r\n", host);
1525                 buffer_append(&stderr_buffer, buf, strlen(buf));
1526         }
1527
1528         /* Output any buffered data for stdout. */
1529         while (buffer_len(&stdout_buffer) > 0) {
1530                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1531                     buffer_len(&stdout_buffer));
1532                 if (len <= 0) {
1533                         error("Write failed flushing stdout buffer.");
1534                         break;
1535                 }
1536                 buffer_consume(&stdout_buffer, len);
1537         }
1538
1539         /* Output any buffered data for stderr. */
1540         while (buffer_len(&stderr_buffer) > 0) {
1541                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1542                     buffer_len(&stderr_buffer));
1543                 if (len <= 0) {
1544                         error("Write failed flushing stderr buffer.");
1545                         break;
1546                 }
1547                 buffer_consume(&stderr_buffer, len);
1548         }
1549
1550         /* Clear and free any buffers. */
1551         memset(buf, 0, sizeof(buf));
1552         buffer_free(&stdin_buffer);
1553         buffer_free(&stdout_buffer);
1554         buffer_free(&stderr_buffer);
1555
1556         /* Report bytes transferred, and transfer rates. */
1557         total_time = get_current_time() - start_time;
1558         packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1559         packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1560         verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1561             obytes, ibytes, total_time);
1562         if (total_time > 0)
1563                 verbose("Bytes per second: sent %.1f, received %.1f",
1564                     obytes / total_time, ibytes / total_time);
1565         /* Return the exit status of the program. */
1566         debug("Exit status %d", exit_status);
1567         return exit_status;
1568 }
1569
1570 /*********/
1571
1572 static void
1573 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1574 {
1575         u_int data_len;
1576         char *data = packet_get_string(&data_len);
1577         packet_check_eom();
1578         buffer_append(&stdout_buffer, data, data_len);
1579         memset(data, 0, data_len);
1580         xfree(data);
1581 }
1582 static void
1583 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1584 {
1585         u_int data_len;
1586         char *data = packet_get_string(&data_len);
1587         packet_check_eom();
1588         buffer_append(&stderr_buffer, data, data_len);
1589         memset(data, 0, data_len);
1590         xfree(data);
1591 }
1592 static void
1593 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1594 {
1595         exit_status = packet_get_int();
1596         packet_check_eom();
1597         /* Acknowledge the exit. */
1598         packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1599         packet_send();
1600         /*
1601          * Must wait for packet to be sent since we are
1602          * exiting the loop.
1603          */
1604         packet_write_wait();
1605         /* Flag that we want to exit. */
1606         quit_pending = 1;
1607 }
1608 static void
1609 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1610 {
1611         Channel *c = NULL;
1612         int remote_id, sock;
1613
1614         /* Read the remote channel number from the message. */
1615         remote_id = packet_get_int();
1616         packet_check_eom();
1617
1618         /*
1619          * Get a connection to the local authentication agent (this may again
1620          * get forwarded).
1621          */
1622         sock = ssh_get_authentication_socket();
1623
1624         /*
1625          * If we could not connect the agent, send an error message back to
1626          * the server. This should never happen unless the agent dies,
1627          * because authentication forwarding is only enabled if we have an
1628          * agent.
1629          */
1630         if (sock >= 0) {
1631                 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1632                     -1, 0, 0, 0, "authentication agent connection", 1);
1633                 c->remote_id = remote_id;
1634                 c->force_drain = 1;
1635         }
1636         if (c == NULL) {
1637                 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1638                 packet_put_int(remote_id);
1639         } else {
1640                 /* Send a confirmation to the remote host. */
1641                 debug("Forwarding authentication connection.");
1642                 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1643                 packet_put_int(remote_id);
1644                 packet_put_int(c->self);
1645         }
1646         packet_send();
1647 }
1648
1649 static Channel *
1650 client_request_forwarded_tcpip(const char *request_type, int rchan)
1651 {
1652         Channel *c = NULL;
1653         char *listen_address, *originator_address;
1654         u_short listen_port, originator_port;
1655
1656         /* Get rest of the packet */
1657         listen_address = packet_get_string(NULL);
1658         listen_port = packet_get_int();
1659         originator_address = packet_get_string(NULL);
1660         originator_port = packet_get_int();
1661         packet_check_eom();
1662
1663         debug("client_request_forwarded_tcpip: listen %s port %d, "
1664             "originator %s port %d", listen_address, listen_port,
1665             originator_address, originator_port);
1666
1667         c = channel_connect_by_listen_address(listen_port,
1668             "forwarded-tcpip", originator_address);
1669
1670         xfree(originator_address);
1671         xfree(listen_address);
1672         return c;
1673 }
1674
1675 static Channel *
1676 client_request_x11(const char *request_type, int rchan)
1677 {
1678         Channel *c = NULL;
1679         char *originator;
1680         u_short originator_port;
1681         int sock;
1682
1683         if (!options.forward_x11) {
1684                 error("Warning: ssh server tried X11 forwarding.");
1685                 error("Warning: this is probably a break-in attempt by a "
1686                     "malicious server.");
1687                 return NULL;
1688         }
1689         originator = packet_get_string(NULL);
1690         if (datafellows & SSH_BUG_X11FWD) {
1691                 debug2("buggy server: x11 request w/o originator_port");
1692                 originator_port = 0;
1693         } else {
1694                 originator_port = packet_get_int();
1695         }
1696         packet_check_eom();
1697         /* XXX check permission */
1698         debug("client_request_x11: request from %s %d", originator,
1699             originator_port);
1700         xfree(originator);
1701         sock = x11_connect_display();
1702         if (sock < 0)
1703                 return NULL;
1704         if (options.hpn_disabled)
1705                 c = channel_new("x11", SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1706                     CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1707                     0, "x11", 1);
1708         else
1709                 c = channel_new("x11", SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1710                     options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT,
1711                     0, "x11", 1);
1712         c->force_drain = 1;
1713         return c;
1714 }
1715
1716 static Channel *
1717 client_request_agent(const char *request_type, int rchan)
1718 {
1719         Channel *c = NULL;
1720         int sock;
1721
1722         if (!options.forward_agent) {
1723                 error("Warning: ssh server tried agent forwarding.");
1724                 error("Warning: this is probably a break-in attempt by a "
1725                     "malicious server.");
1726                 return NULL;
1727         }
1728         sock = ssh_get_authentication_socket();
1729         if (sock < 0)
1730                 return NULL;
1731         if (options.hpn_disabled)
1732                 c = channel_new("authentication agent connection",
1733                     SSH_CHANNEL_OPEN, sock, sock, -1,
1734                     CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1735                     "authentication agent connection", 1);
1736         else
1737                 c = channel_new("authentication agent connection",
1738                     SSH_CHANNEL_OPEN, sock, sock, -1,
1739                     options.hpn_buffer_size, options.hpn_buffer_size, 0,
1740                     "authentication agent connection", 1);
1741         c->force_drain = 1;
1742         return c;
1743 }
1744
1745 int
1746 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1747 {
1748         Channel *c;
1749         int fd;
1750
1751         if (tun_mode == SSH_TUNMODE_NO)
1752                 return 0;
1753
1754         if (!compat20) {
1755                 error("Tunnel forwarding is not supported for protocol 1");
1756                 return -1;
1757         }
1758
1759         debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1760
1761         /* Open local tunnel device */
1762         if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1763                 error("Tunnel device open failed.");
1764                 return -1;
1765         }
1766
1767         if (options.hpn_disabled)
1768                 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1769                     CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1770                     0, "tun", 1);
1771         else
1772                 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1773                     options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
1774                     0, "tun", 1);
1775         c->datagram = 1;
1776
1777 #if defined(SSH_TUN_FILTER)
1778         if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1779                 channel_register_filter(c->self, sys_tun_infilter,
1780                     sys_tun_outfilter, NULL, NULL);
1781 #endif
1782
1783         packet_start(SSH2_MSG_CHANNEL_OPEN);
1784         packet_put_cstring("tun@openssh.com");
1785         packet_put_int(c->self);
1786         packet_put_int(c->local_window_max);
1787         packet_put_int(c->local_maxpacket);
1788         packet_put_int(tun_mode);
1789         packet_put_int(remote_tun);
1790         packet_send();
1791
1792         return 0;
1793 }
1794
1795 /* XXXX move to generic input handler */
1796 static void
1797 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1798 {
1799         Channel *c = NULL;
1800         char *ctype;
1801         int rchan;
1802         u_int rmaxpack, rwindow, len;
1803
1804         ctype = packet_get_string(&len);
1805         rchan = packet_get_int();
1806         rwindow = packet_get_int();
1807         rmaxpack = packet_get_int();
1808
1809         debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1810             ctype, rchan, rwindow, rmaxpack);
1811
1812         if (strcmp(ctype, "forwarded-tcpip") == 0) {
1813                 c = client_request_forwarded_tcpip(ctype, rchan);
1814         } else if (strcmp(ctype, "x11") == 0) {
1815                 c = client_request_x11(ctype, rchan);
1816         } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1817                 c = client_request_agent(ctype, rchan);
1818         }
1819 /* XXX duplicate : */
1820         if (c != NULL) {
1821                 debug("confirm %s", ctype);
1822                 c->remote_id = rchan;
1823                 c->remote_window = rwindow;
1824                 c->remote_maxpacket = rmaxpack;
1825                 if (c->type != SSH_CHANNEL_CONNECTING) {
1826                         packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1827                         packet_put_int(c->remote_id);
1828                         packet_put_int(c->self);
1829                         packet_put_int(c->local_window);
1830                         packet_put_int(c->local_maxpacket);
1831                         packet_send();
1832                 }
1833         } else {
1834                 debug("failure %s", ctype);
1835                 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1836                 packet_put_int(rchan);
1837                 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1838                 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1839                         packet_put_cstring("open failed");
1840                         packet_put_cstring("");
1841                 }
1842                 packet_send();
1843         }
1844         xfree(ctype);
1845 }
1846 static void
1847 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1848 {
1849         Channel *c = NULL;
1850         int exitval, id, reply, success = 0;
1851         char *rtype;
1852
1853         id = packet_get_int();
1854         rtype = packet_get_string(NULL);
1855         reply = packet_get_char();
1856
1857         debug("client_input_channel_req: channel %d rtype %s reply %d",
1858             id, rtype, reply);
1859
1860         if (id == -1) {
1861                 error("client_input_channel_req: request for channel -1");
1862         } else if ((c = channel_lookup(id)) == NULL) {
1863                 error("client_input_channel_req: channel %d: "
1864                     "unknown channel", id);
1865         } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1866                 packet_check_eom();
1867                 chan_rcvd_eow(c);
1868         } else if (strcmp(rtype, "exit-status") == 0) {
1869                 exitval = packet_get_int();
1870                 if (c->ctl_chan != -1) {
1871                         mux_exit_message(c, exitval);
1872                         success = 1;
1873                 } else if (id == session_ident) {
1874                         /* Record exit value of local session */
1875                         success = 1;
1876                         exit_status = exitval;
1877                 } else {
1878                         /* Probably for a mux channel that has already closed */
1879                         debug("%s: no sink for exit-status on channel %d",
1880                             __func__, id);
1881                 }
1882                 packet_check_eom();
1883         }
1884         if (reply) {
1885                 packet_start(success ?
1886                     SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1887                 packet_put_int(c->remote_id);
1888                 packet_send();
1889         }
1890         xfree(rtype);
1891 }
1892 static void
1893 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1894 {
1895         char *rtype;
1896         int want_reply;
1897         int success = 0;
1898
1899         rtype = packet_get_string(NULL);
1900         want_reply = packet_get_char();
1901         debug("client_input_global_request: rtype %s want_reply %d",
1902             rtype, want_reply);
1903         if (want_reply) {
1904                 packet_start(success ?
1905                     SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1906                 packet_send();
1907                 packet_write_wait();
1908         }
1909         xfree(rtype);
1910 }
1911
1912 void
1913 client_session2_setup(int id, int want_tty, int want_subsystem,
1914     const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1915 {
1916         int len;
1917         Channel *c = NULL;
1918
1919         debug2("%s: id %d", __func__, id);
1920
1921         if ((c = channel_lookup(id)) == NULL)
1922                 fatal("client_session2_setup: channel %d: unknown channel", id);
1923
1924         if (want_tty) {
1925                 struct winsize ws;
1926
1927                 /* Store window size in the packet. */
1928                 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1929                         memset(&ws, 0, sizeof(ws));
1930
1931                 channel_request_start(id, "pty-req", 1);
1932                 client_expect_confirm(id, "PTY allocation", 0);
1933                 packet_put_cstring(term != NULL ? term : "");
1934                 packet_put_int((u_int)ws.ws_col);
1935                 packet_put_int((u_int)ws.ws_row);
1936                 packet_put_int((u_int)ws.ws_xpixel);
1937                 packet_put_int((u_int)ws.ws_ypixel);
1938                 if (tiop == NULL)
1939                         tiop = get_saved_tio();
1940                 tty_make_modes(-1, tiop);
1941                 packet_send();
1942                 /* XXX wait for reply */
1943                 c->client_tty = 1;
1944         }
1945
1946         /* Transfer any environment variables from client to server */
1947         if (options.num_send_env != 0 && env != NULL) {
1948                 int i, j, matched;
1949                 char *name, *val;
1950
1951                 debug("Sending environment.");
1952                 for (i = 0; env[i] != NULL; i++) {
1953                         /* Split */
1954                         name = xstrdup(env[i]);
1955                         if ((val = strchr(name, '=')) == NULL) {
1956                                 xfree(name);
1957                                 continue;
1958                         }
1959                         *val++ = '\0';
1960
1961                         matched = 0;
1962                         for (j = 0; j < options.num_send_env; j++) {
1963                                 if (match_pattern(name, options.send_env[j])) {
1964                                         matched = 1;
1965                                         break;
1966                                 }
1967                         }
1968                         if (!matched) {
1969                                 debug3("Ignored env %s", name);
1970                                 xfree(name);
1971                                 continue;
1972                         }
1973
1974                         debug("Sending env %s = %s", name, val);
1975                         channel_request_start(id, "env", 0);
1976                         packet_put_cstring(name);
1977                         packet_put_cstring(val);
1978                         packet_send();
1979                         xfree(name);
1980                 }
1981         }
1982
1983         len = buffer_len(cmd);
1984         if (len > 0) {
1985                 if (len > 900)
1986                         len = 900;
1987                 if (want_subsystem) {
1988                         debug("Sending subsystem: %.*s",
1989                             len, (u_char*)buffer_ptr(cmd));
1990                         channel_request_start(id, "subsystem", 1);
1991                         client_expect_confirm(id, "subsystem", 1);
1992                 } else {
1993                         debug("Sending command: %.*s",
1994                             len, (u_char*)buffer_ptr(cmd));
1995                         channel_request_start(id, "exec", 1);
1996                         client_expect_confirm(id, "exec", 1);
1997                 }
1998                 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1999                 packet_send();
2000         } else {
2001                 channel_request_start(id, "shell", 1);
2002                 client_expect_confirm(id, "shell", 1);
2003                 packet_send();
2004         }
2005 }
2006
2007 static void
2008 client_init_dispatch_20(void)
2009 {
2010         dispatch_init(&dispatch_protocol_error);
2011
2012         dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2013         dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2014         dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2015         dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2016         dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2017         dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2018         dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2019         dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2020         dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2021         dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2022         dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2023         dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2024
2025         /* rekeying */
2026         dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2027
2028         /* global request reply messages */
2029         dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2030         dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2031 }
2032
2033 static void
2034 client_init_dispatch_13(void)
2035 {
2036         dispatch_init(NULL);
2037         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2038         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2039         dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2040         dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2041         dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2042         dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2043         dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2044         dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2045         dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2046
2047         dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2048             &client_input_agent_open : &deny_input_open);
2049         dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2050             &x11_input_open : &deny_input_open);
2051 }
2052
2053 static void
2054 client_init_dispatch_15(void)
2055 {
2056         client_init_dispatch_13();
2057         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2058         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2059 }
2060
2061 static void
2062 client_init_dispatch(void)
2063 {
2064         if (compat20)
2065                 client_init_dispatch_20();
2066         else if (compat13)
2067                 client_init_dispatch_13();
2068         else
2069                 client_init_dispatch_15();
2070 }
2071
2072 /* client specific fatal cleanup */
2073 void
2074 cleanup_exit(int i)
2075 {
2076         leave_raw_mode(force_tty_flag);
2077         leave_non_blocking();
2078         if (options.control_path != NULL && muxserver_sock != -1)
2079                 unlink(options.control_path);
2080         _exit(i);
2081 }