openssh/clientloop.c

   1 /* $OpenBSD: clientloop.c,v 1.209 2009/02/12 03:00:56 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
 113 #ifdef GSSAPI
 114 #include "ssh-gss.h"
 115 #endif
 116
 117 /* import options */
 118 extern Options options;
 119
 120 /* Flag indicating that stdin should be redirected from /dev/null. */
 121 extern int stdin_null_flag;
 122
 123 /* Flag indicating that no shell has been requested */
 124 extern int no_shell_flag;
 125
 126 /* Control socket */
 127 extern int muxserver_sock;
 128
 129 /*
 130  * Name of the host we are connecting to.  This is the name given on the
 131  * command line, or the HostName specified for the user-supplied name in a
 132  * configuration file.
 133  */
 134 extern char *host;
 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 static 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 /* Track escape per proto2 channel */
 168 struct escape_filter_ctx {
 169         int escape_pending;
 170         int escape_char;
 171 };
 172
 173 /* Context for channel confirmation replies */
 174 struct channel_reply_ctx {
 175         const char *request_type;
 176         int id, do_close;
 177 };
 178
 179 /* Global request success/failure callbacks */
 180 struct global_confirm {
 181         TAILQ_ENTRY(global_confirm) entry;
 182         global_confirm_cb *cb;
 183         void *ctx;
 184         int ref_count;
 185 };
 186 TAILQ_HEAD(global_confirms, global_confirm);
 187 static struct global_confirms global_confirms =
 188     TAILQ_HEAD_INITIALIZER(global_confirms);
 189
 190 /*XXX*/
 191 extern Kex *xxx_kex;
 192
 193 void ssh_process_session2_setup(int, int, int, Buffer *);
 194
 195 /* Restores stdin to blocking mode. */
 196
 197 static void
 198 leave_non_blocking(void)
 199 {
 200         if (in_non_blocking_mode) {
 201                 unset_nonblock(fileno(stdin));
 202                 in_non_blocking_mode = 0;
 203         }
 204 }
 205
 206 /* Puts stdin terminal in non-blocking mode. */
 207
 208 static void
 209 enter_non_blocking(void)
 210 {
 211         in_non_blocking_mode = 1;
 212         set_nonblock(fileno(stdin));
 213 }
 214
 215 /*
 216  * Signal handler for the window change signal (SIGWINCH).  This just sets a
 217  * flag indicating that the window has changed.
 218  */
 219 /*ARGSUSED */
 220 static void
 221 window_change_handler(int sig)
 222 {
 223         received_window_change_signal = 1;
 224         signal(SIGWINCH, window_change_handler);
 225 }
 226
 227 /*
 228  * Signal handler for signals that cause the program to terminate.  These
 229  * signals must be trapped to restore terminal modes.
 230  */
 231 /*ARGSUSED */
 232 static void
 233 signal_handler(int sig)
 234 {
 235         received_signal = sig;
 236         quit_pending = 1;
 237 }
 238
 239 /*
 240  * Returns current time in seconds from Jan 1, 1970 with the maximum
 241  * available resolution.
 242  */
 243
 244 static double
 245 get_current_time(void)
 246 {
 247         struct timeval tv;
 248         gettimeofday(&tv, NULL);
 249         return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
 250 }
 251
 252 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
 253 void
 254 client_x11_get_proto(const char *display, const char *xauth_path,
 255     u_int trusted, char **_proto, char **_data)
 256 {
 257         char cmd[1024];
 258         char line[512];
 259         char xdisplay[512];
 260         static char proto[512], data[512];
 261         FILE *f;
 262         int got_data = 0, generated = 0, do_unlink = 0, i;
 263         char *xauthdir, *xauthfile;
 264         struct stat st;
 265
 266         xauthdir = xauthfile = NULL;
 267         *_proto = proto;
 268         *_data = data;
 269         proto[0] = data[0] = '\0';
 270
 271         if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
 272                 debug("No xauth program.");
 273         } else {
 274                 if (display == NULL) {
 275                         debug("x11_get_proto: DISPLAY not set");
 276                         return;
 277                 }
 278                 /*
 279                  * Handle FamilyLocal case where $DISPLAY does
 280                  * not match an authorization entry.  For this we
 281                  * just try "xauth list unix:displaynum.screennum".
 282                  * XXX: "localhost" match to determine FamilyLocal
 283                  *      is not perfect.
 284                  */
 285                 if (strncmp(display, "localhost:", 10) == 0) {
 286                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
 287                             display + 10);
 288                         display = xdisplay;
 289                 }
 290                 if (trusted == 0) {
 291                         xauthdir = xmalloc(MAXPATHLEN);
 292                         xauthfile = xmalloc(MAXPATHLEN);
 293                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
 294                         if (mkdtemp(xauthdir) != NULL) {
 295                                 do_unlink = 1;
 296                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
 297                                     xauthdir);
 298                                 snprintf(cmd, sizeof(cmd),
 299                                     "%s -f %s generate %s " SSH_X11_PROTO
 300                                     " untrusted timeout 1200 2>" _PATH_DEVNULL,
 301                                     xauth_path, xauthfile, display);
 302                                 debug2("x11_get_proto: %s", cmd);
 303                                 if (system(cmd) == 0)
 304                                         generated = 1;
 305                         }
 306                 }
 307
 308                 /*
 309                  * When in untrusted mode, we read the cookie only if it was
 310                  * successfully generated as an untrusted one in the step
 311                  * above.
 312                  */
 313                 if (trusted || generated) {
 314                         snprintf(cmd, sizeof(cmd),
 315                             "%s %s%s list %s 2>" _PATH_DEVNULL,
 316                             xauth_path,
 317                             generated ? "-f " : "" ,
 318                             generated ? xauthfile : "",
 319                             display);
 320                         debug2("x11_get_proto: %s", cmd);
 321                         f = popen(cmd, "r");
 322                         if (f && fgets(line, sizeof(line), f) &&
 323                             sscanf(line, "%*s %511s %511s", proto, data) == 2)
 324                                 got_data = 1;
 325                         if (f)
 326                                 pclose(f);
 327                 } else
 328                         error("Warning: untrusted X11 forwarding setup failed: "
 329                             "xauth key data not generated");
 330         }
 331
 332         if (do_unlink) {
 333                 unlink(xauthfile);
 334                 rmdir(xauthdir);
 335         }
 336         if (xauthdir)
 337                 xfree(xauthdir);
 338         if (xauthfile)
 339                 xfree(xauthfile);
 340
 341         /*
 342          * If we didn't get authentication data, just make up some
 343          * data.  The forwarding code will check the validity of the
 344          * response anyway, and substitute this data.  The X11
 345          * server, however, will ignore this fake data and use
 346          * whatever authentication mechanisms it was using otherwise
 347          * for the local connection.
 348          */
 349         if (!got_data) {
 350                 u_int32_t rnd = 0;
 351
 352                 logit("Warning: No xauth data; "
 353                     "using fake authentication data for X11 forwarding.");
 354                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
 355                 for (i = 0; i < 16; i++) {
 356                         if (i % 4 == 0)
 357                                 rnd = arc4random();
 358                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
 359                             rnd & 0xff);
 360                         rnd >>= 8;
 361                 }
 362         }
 363 }
 364
 365 /*
 366  * This is called when the interactive is entered.  This checks if there is
 367  * an EOF coming on stdin.  We must check this explicitly, as select() does
 368  * not appear to wake up when redirecting from /dev/null.
 369  */
 370
 371 static void
 372 client_check_initial_eof_on_stdin(void)
 373 {
 374         int len;
 375         char buf[1];
 376
 377         /*
 378          * If standard input is to be "redirected from /dev/null", we simply
 379          * mark that we have seen an EOF and send an EOF message to the
 380          * server. Otherwise, we try to read a single character; it appears
 381          * that for some files, such /dev/null, select() never wakes up for
 382          * read for this descriptor, which means that we never get EOF.  This
 383          * way we will get the EOF if stdin comes from /dev/null or similar.
 384          */
 385         if (stdin_null_flag) {
 386                 /* Fake EOF on stdin. */
 387                 debug("Sending eof.");
 388                 stdin_eof = 1;
 389                 packet_start(SSH_CMSG_EOF);
 390                 packet_send();
 391         } else {
 392                 enter_non_blocking();
 393
 394                 /* Check for immediate EOF on stdin. */
 395                 len = read(fileno(stdin), buf, 1);
 396                 if (len == 0) {
 397                         /*
 398                          * EOF.  Record that we have seen it and send
 399                          * EOF to server.
 400                          */
 401                         debug("Sending eof.");
 402                         stdin_eof = 1;
 403                         packet_start(SSH_CMSG_EOF);
 404                         packet_send();
 405                 } else if (len > 0) {
 406                         /*
 407                          * Got data.  We must store the data in the buffer,
 408                          * and also process it as an escape character if
 409                          * appropriate.
 410                          */
 411                         if ((u_char) buf[0] == escape_char1)
 412                                 escape_pending1 = 1;
 413                         else
 414                                 buffer_append(&stdin_buffer, buf, 1);
 415                 }
 416                 leave_non_blocking();
 417         }
 418 }
 419
 420
 421 /*
 422  * Make packets from buffered stdin data, and buffer them for sending to the
 423  * connection.
 424  */
 425
 426 static void
 427 client_make_packets_from_stdin_data(void)
 428 {
 429         u_int len;
 430
 431         /* Send buffered stdin data to the server. */
 432         while (buffer_len(&stdin_buffer) > 0 &&
 433             packet_not_very_much_data_to_write()) {
 434                 len = buffer_len(&stdin_buffer);
 435                 /* Keep the packets at reasonable size. */
 436                 if (len > packet_get_maxsize())
 437                         len = packet_get_maxsize();
 438                 packet_start(SSH_CMSG_STDIN_DATA);
 439                 packet_put_string(buffer_ptr(&stdin_buffer), len);
 440                 packet_send();
 441                 buffer_consume(&stdin_buffer, len);
 442                 /* If we have a pending EOF, send it now. */
 443                 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
 444                         packet_start(SSH_CMSG_EOF);
 445                         packet_send();
 446                 }
 447         }
 448 }
 449
 450 /*
 451  * Checks if the client window has changed, and sends a packet about it to
 452  * the server if so.  The actual change is detected elsewhere (by a software
 453  * interrupt on Unix); this just checks the flag and sends a message if
 454  * appropriate.
 455  */
 456
 457 static void
 458 client_check_window_change(void)
 459 {
 460         struct winsize ws;
 461
 462         if (! received_window_change_signal)
 463                 return;
 464         /** XXX race */
 465         received_window_change_signal = 0;
 466
 467         debug2("client_check_window_change: changed");
 468
 469         if (compat20) {
 470                 channel_send_window_changes();
 471         } else {
 472                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
 473                         return;
 474                 packet_start(SSH_CMSG_WINDOW_SIZE);
 475                 packet_put_int((u_int)ws.ws_row);
 476                 packet_put_int((u_int)ws.ws_col);
 477                 packet_put_int((u_int)ws.ws_xpixel);
 478                 packet_put_int((u_int)ws.ws_ypixel);
 479                 packet_send();
 480         }
 481 }
 482
 483 static void
 484 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
 485 {
 486         struct global_confirm *gc;
 487
 488         if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
 489                 return;
 490         if (gc->cb != NULL)
 491                 gc->cb(type, seq, gc->ctx);
 492         if (--gc->ref_count <= 0) {
 493                 TAILQ_REMOVE(&global_confirms, gc, entry);
 494                 bzero(gc, sizeof(*gc));
 495                 xfree(gc);
 496         }
 497
 498         keep_alive_timeouts = 0;
 499 }
 500
 501 static void
 502 server_alive_check(void)
 503 {
 504         if (++keep_alive_timeouts > options.server_alive_count_max) {
 505                 logit("Timeout, server not responding.");
 506                 cleanup_exit(255);
 507         }
 508         packet_start(SSH2_MSG_GLOBAL_REQUEST);
 509         packet_put_cstring("keepalive@openssh.com");
 510         packet_put_char(1);     /* boolean: want reply */
 511         packet_send();
 512         /* Insert an empty placeholder to maintain ordering */
 513         client_register_global_confirm(NULL, NULL);
 514 }
 515
 516 /*
 517  * Waits until the client can do something (some data becomes available on
 518  * one of the file descriptors).
 519  */
 520 static void
 521 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
 522     int *maxfdp, u_int *nallocp, int rekeying)
 523 {
 524         struct timeval tv, *tvp;
 525         int ret;
 526
 527         /* Add any selections by the channel mechanism. */
 528         channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
 529
 530         if (!compat20) {
 531                 /* Read from the connection, unless our buffers are full. */
 532                 if (buffer_len(&stdout_buffer) < buffer_high &&
 533                     buffer_len(&stderr_buffer) < buffer_high &&
 534                     channel_not_very_much_buffered_data())
 535                         FD_SET(connection_in, *readsetp);
 536                 /*
 537                  * Read from stdin, unless we have seen EOF or have very much
 538                  * buffered data to send to the server.
 539                  */
 540                 if (!stdin_eof && packet_not_very_much_data_to_write())
 541                         FD_SET(fileno(stdin), *readsetp);
 542
 543                 /* Select stdout/stderr if have data in buffer. */
 544                 if (buffer_len(&stdout_buffer) > 0)
 545                         FD_SET(fileno(stdout), *writesetp);
 546                 if (buffer_len(&stderr_buffer) > 0)
 547                         FD_SET(fileno(stderr), *writesetp);
 548         } else {
 549                 /* channel_prepare_select could have closed the last channel */
 550                 if (session_closed && !channel_still_open() &&
 551                     !packet_have_data_to_write()) {
 552                         /* clear mask since we did not call select() */
 553                         memset(*readsetp, 0, *nallocp);
 554                         memset(*writesetp, 0, *nallocp);
 555                         return;
 556                 } else {
 557                         FD_SET(connection_in, *readsetp);
 558                 }
 559         }
 560
 561         /* Select server connection if have data to write to the server. */
 562         if (packet_have_data_to_write())
 563                 FD_SET(connection_out, *writesetp);
 564
 565         if (muxserver_sock != -1)
 566                 FD_SET(muxserver_sock, *readsetp);
 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();
 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();
 636 }
 637
 638 static void
 639 client_process_net_input(fd_set *readset)
 640 {
 641         int len;
 642         char buf[8192];
 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 = read(connection_in, buf, sizeof(buf));
 651                 if (len == 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_fd != -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();
 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         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();
 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_fd != -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_fd != -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_fd != -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();
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_fd != -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_fd != -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[8192];
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();
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         if (muxserver_sock != -1)
1329                 max_fd = MAX(max_fd, muxserver_sock);
1330
1331         if (!compat20) {
1332                 /* enable nonblocking unless tty */
1333                 if (!isatty(fileno(stdin)))
1334                         set_nonblock(fileno(stdin));
1335                 if (!isatty(fileno(stdout)))
1336                         set_nonblock(fileno(stdout));
1337                 if (!isatty(fileno(stderr)))
1338                         set_nonblock(fileno(stderr));
1339                 max_fd = MAX(max_fd, fileno(stdin));
1340                 max_fd = MAX(max_fd, fileno(stdout));
1341                 max_fd = MAX(max_fd, fileno(stderr));
1342         }
1343         quit_pending = 0;
1344         escape_char1 = escape_char_arg;
1345
1346         /* Initialize buffers. */
1347         buffer_init(&stdin_buffer);
1348         buffer_init(&stdout_buffer);
1349         buffer_init(&stderr_buffer);
1350
1351         client_init_dispatch();
1352
1353         /*
1354          * Set signal handlers, (e.g. to restore non-blocking mode)
1355          * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1356          */
1357         if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1358                 signal(SIGHUP, signal_handler);
1359         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1360                 signal(SIGINT, signal_handler);
1361         if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1362                 signal(SIGQUIT, signal_handler);
1363         if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1364                 signal(SIGTERM, signal_handler);
1365         signal(SIGWINCH, window_change_handler);
1366
1367         if (have_pty)
1368                 enter_raw_mode();
1369
1370         if (compat20) {
1371                 session_ident = ssh2_chan_id;
1372                 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1373                         channel_register_filter(session_ident,
1374                             client_simple_escape_filter, NULL,
1375                             client_filter_cleanup,
1376                             client_new_escape_filter_ctx(escape_char_arg));
1377                 if (session_ident != -1)
1378                         channel_register_cleanup(session_ident,
1379                             client_channel_closed, 0);
1380         } else {
1381                 /* Check if we should immediately send eof on stdin. */
1382                 client_check_initial_eof_on_stdin();
1383         }
1384
1385         /* Main loop of the client for the interactive session mode. */
1386         while (!quit_pending) {
1387
1388                 /* Process buffered packets sent by the server. */
1389                 client_process_buffered_input_packets();
1390
1391                 if (compat20 && session_closed && !channel_still_open())
1392                         break;
1393
1394                 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1395
1396                 if (rekeying) {
1397                         debug("rekeying in progress");
1398                 } else {
1399                         /*
1400                          * Make packets of buffered stdin data, and buffer
1401                          * them for sending to the server.
1402                          */
1403                         if (!compat20)
1404                                 client_make_packets_from_stdin_data();
1405
1406                         /*
1407                          * Make packets from buffered channel data, and
1408                          * enqueue them for sending to the server.
1409                          */
1410                         if (packet_not_very_much_data_to_write())
1411                                 channel_output_poll();
1412
1413                         /*
1414                          * Check if the window size has changed, and buffer a
1415                          * message about it to the server if so.
1416                          */
1417                         client_check_window_change();
1418
1419                         if (quit_pending)
1420                                 break;
1421                 }
1422                 /*
1423                  * Wait until we have something to do (something becomes
1424                  * available on one of the descriptors).
1425                  */
1426                 max_fd2 = max_fd;
1427                 client_wait_until_can_do_something(&readset, &writeset,
1428                     &max_fd2, &nalloc, rekeying);
1429
1430                 if (quit_pending)
1431                         break;
1432
1433                 /* Do channel operations unless rekeying in progress. */
1434                 if (!rekeying) {
1435                         channel_after_select(readset, writeset);
1436
1437 #ifdef GSSAPI
1438                         if (options.gss_renewal_rekey &&
1439                             ssh_gssapi_credentials_updated(GSS_C_NO_CONTEXT)) {
1440                                 debug("credentials updated - forcing rekey");
1441                                 need_rekeying = 1;
1442                         }
1443 #endif
1444
1445                         if (need_rekeying || packet_need_rekeying()) {
1446                                 debug("need rekeying");
1447                                 xxx_kex->done = 0;
1448                                 kex_send_kexinit(xxx_kex);
1449                                 need_rekeying = 0;
1450                         }
1451                 }
1452
1453                 /* Buffer input from the connection.  */
1454                 client_process_net_input(readset);
1455
1456                 /* Accept control connections.  */
1457                 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1458                         if (muxserver_accept_control())
1459                                 quit_pending = 1;
1460                 }
1461
1462                 if (quit_pending)
1463                         break;
1464
1465                 if (!compat20) {
1466                         /* Buffer data from stdin */
1467                         client_process_input(readset);
1468                         /*
1469                          * Process output to stdout and stderr.  Output to
1470                          * the connection is processed elsewhere (above).
1471                          */
1472                         client_process_output(writeset);
1473                 }
1474
1475                 /*
1476                  * Send as much buffered packet data as possible to the
1477                  * sender.
1478                  */
1479                 if (FD_ISSET(connection_out, writeset))
1480                         packet_write_poll();
1481         }
1482         if (readset)
1483                 xfree(readset);
1484         if (writeset)
1485                 xfree(writeset);
1486
1487         /* Terminate the session. */
1488
1489         /* Stop watching for window change. */
1490         signal(SIGWINCH, SIG_DFL);
1491
1492         channel_free_all();
1493
1494         if (have_pty)
1495                 leave_raw_mode();
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         /* again is this really necessary for X11? */
1705         if (options.hpn_disabled)
1706         c = channel_new("x11",
1707             SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1708             CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1709         else
1710                 c = channel_new("x11",
1711                     SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1712                     options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1713         c->force_drain = 1;
1714         return c;
1715 }
1716
1717 static Channel *
1718 client_request_agent(const char *request_type, int rchan)
1719 {
1720         Channel *c = NULL;
1721         int sock;
1722
1723         if (!options.forward_agent) {
1724                 error("Warning: ssh server tried agent forwarding.");
1725                 error("Warning: this is probably a break-in attempt by a "
1726                     "malicious server.");
1727                 return NULL;
1728         }
1729         sock = ssh_get_authentication_socket();
1730         if (sock < 0)
1731                 return NULL;
1732         if (options.hpn_disabled)
1733         c = channel_new("authentication agent connection",
1734             SSH_CHANNEL_OPEN, sock, sock, -1,
1735                     CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1736                     "authentication agent connection", 1);
1737        else
1738         c = channel_new("authentication agent connection",
1739             SSH_CHANNEL_OPEN, sock, sock, -1,
1740                    options.hpn_buffer_size, options.hpn_buffer_size, 0,
1741             "authentication agent connection", 1);
1742         c->force_drain = 1;
1743         return c;
1744 }
1745
1746 int
1747 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1748 {
1749         Channel *c;
1750         int fd;
1751
1752         if (tun_mode == SSH_TUNMODE_NO)
1753                 return 0;
1754
1755         if (!compat20) {
1756                 error("Tunnel forwarding is not supported for protocol 1");
1757                 return -1;
1758         }
1759
1760         debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1761
1762         /* Open local tunnel device */
1763         if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1764                 error("Tunnel device open failed.");
1765                 return -1;
1766         }
1767
1768         if(options.hpn_disabled)
1769         c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1770                                 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1771                                 0, "tun", 1);
1772         else
1773         c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1774                                 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
1775                                 0, "tun", 1);
1776         c->datagram = 1;
1777
1778
1779
1780 #if defined(SSH_TUN_FILTER)
1781         if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1782                 channel_register_filter(c->self, sys_tun_infilter,
1783                     sys_tun_outfilter, NULL, NULL);
1784 #endif
1785
1786         packet_start(SSH2_MSG_CHANNEL_OPEN);
1787         packet_put_cstring("tun@openssh.com");
1788         packet_put_int(c->self);
1789         packet_put_int(c->local_window_max);
1790         packet_put_int(c->local_maxpacket);
1791         packet_put_int(tun_mode);
1792         packet_put_int(remote_tun);
1793         packet_send();
1794
1795         return 0;
1796 }
1797
1798 /* XXXX move to generic input handler */
1799 static void
1800 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1801 {
1802         Channel *c = NULL;
1803         char *ctype;
1804         int rchan;
1805         u_int rmaxpack, rwindow, len;
1806
1807         ctype = packet_get_string(&len);
1808         rchan = packet_get_int();
1809         rwindow = packet_get_int();
1810         rmaxpack = packet_get_int();
1811
1812         debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1813             ctype, rchan, rwindow, rmaxpack);
1814
1815         if (strcmp(ctype, "forwarded-tcpip") == 0) {
1816                 c = client_request_forwarded_tcpip(ctype, rchan);
1817         } else if (strcmp(ctype, "x11") == 0) {
1818                 c = client_request_x11(ctype, rchan);
1819         } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1820                 c = client_request_agent(ctype, rchan);
1821         }
1822 /* XXX duplicate : */
1823         if (c != NULL) {
1824                 debug("confirm %s", ctype);
1825                 c->remote_id = rchan;
1826                 c->remote_window = rwindow;
1827                 c->remote_maxpacket = rmaxpack;
1828                 if (c->type != SSH_CHANNEL_CONNECTING) {
1829                         packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1830                         packet_put_int(c->remote_id);
1831                         packet_put_int(c->self);
1832                         packet_put_int(c->local_window);
1833                         packet_put_int(c->local_maxpacket);
1834                         packet_send();
1835                 }
1836         } else {
1837                 debug("failure %s", ctype);
1838                 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1839                 packet_put_int(rchan);
1840                 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1841                 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1842                         packet_put_cstring("open failed");
1843                         packet_put_cstring("");
1844                 }
1845                 packet_send();
1846         }
1847         xfree(ctype);
1848 }
1849 static void
1850 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1851 {
1852         Channel *c = NULL;
1853         int exitval, id, reply, success = 0;
1854         char *rtype;
1855
1856         id = packet_get_int();
1857         rtype = packet_get_string(NULL);
1858         reply = packet_get_char();
1859
1860         debug("client_input_channel_req: channel %d rtype %s reply %d",
1861             id, rtype, reply);
1862
1863         if (id == -1) {
1864                 error("client_input_channel_req: request for channel -1");
1865         } else if ((c = channel_lookup(id)) == NULL) {
1866                 error("client_input_channel_req: channel %d: "
1867                     "unknown channel", id);
1868         } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1869                 packet_check_eom();
1870                 chan_rcvd_eow(c);
1871         } else if (strcmp(rtype, "exit-status") == 0) {
1872                 exitval = packet_get_int();
1873                 if (id == session_ident) {
1874                         success = 1;
1875                         exit_status = exitval;
1876                 } else if (c->ctl_fd == -1) {
1877                         error("client_input_channel_req: unexpected channel %d",
1878                             session_ident);
1879                 } else {
1880                         atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1881                         success = 1;
1882                 }
1883                 packet_check_eom();
1884         }
1885         if (reply) {
1886                 packet_start(success ?
1887                     SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1888                 packet_put_int(c->remote_id);
1889                 packet_send();
1890         }
1891         xfree(rtype);
1892 }
1893 static void
1894 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1895 {
1896         char *rtype;
1897         int want_reply;
1898         int success = 0;
1899
1900         rtype = packet_get_string(NULL);
1901         want_reply = packet_get_char();
1902         debug("client_input_global_request: rtype %s want_reply %d",
1903             rtype, want_reply);
1904         if (want_reply) {
1905                 packet_start(success ?
1906                     SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1907                 packet_send();
1908                 packet_write_wait();
1909         }
1910         xfree(rtype);
1911 }
1912
1913 void
1914 client_session2_setup(int id, int want_tty, int want_subsystem,
1915     const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1916 {
1917         int len;
1918         Channel *c = NULL;
1919
1920         debug2("%s: id %d", __func__, id);
1921
1922         if ((c = channel_lookup(id)) == NULL)
1923                 fatal("client_session2_setup: channel %d: unknown channel", id);
1924
1925         if (want_tty) {
1926                 struct winsize ws;
1927
1928                 /* Store window size in the packet. */
1929                 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1930                         memset(&ws, 0, sizeof(ws));
1931
1932                 channel_request_start(id, "pty-req", 1);
1933                 client_expect_confirm(id, "PTY allocation", 0);
1934                 packet_put_cstring(term != NULL ? term : "");
1935                 packet_put_int((u_int)ws.ws_col);
1936                 packet_put_int((u_int)ws.ws_row);
1937                 packet_put_int((u_int)ws.ws_xpixel);
1938                 packet_put_int((u_int)ws.ws_ypixel);
1939                 if (tiop == NULL)
1940                         tiop = get_saved_tio();
1941                 tty_make_modes(-1, tiop);
1942                 packet_send();
1943                 /* XXX wait for reply */
1944                 c->client_tty = 1;
1945         }
1946
1947         /* Transfer any environment variables from client to server */
1948         if (options.num_send_env != 0 && env != NULL) {
1949                 int i, j, matched;
1950                 char *name, *val;
1951
1952                 debug("Sending environment.");
1953                 for (i = 0; env[i] != NULL; i++) {
1954                         /* Split */
1955                         name = xstrdup(env[i]);
1956                         if ((val = strchr(name, '=')) == NULL) {
1957                                 xfree(name);
1958                                 continue;
1959                         }
1960                         *val++ = '\0';
1961
1962                         matched = 0;
1963                         for (j = 0; j < options.num_send_env; j++) {
1964                                 if (match_pattern(name, options.send_env[j])) {
1965                                         matched = 1;
1966                                         break;
1967                                 }
1968                         }
1969                         if (!matched) {
1970                                 debug3("Ignored env %s", name);
1971                                 xfree(name);
1972                                 continue;
1973                         }
1974
1975                         debug("Sending env %s = %s", name, val);
1976                         channel_request_start(id, "env", 0);
1977                         packet_put_cstring(name);
1978                         packet_put_cstring(val);
1979                         packet_send();
1980                         xfree(name);
1981                 }
1982         }
1983
1984         len = buffer_len(cmd);
1985         if (len > 0) {
1986                 if (len > 900)
1987                         len = 900;
1988                 if (want_subsystem) {
1989                         debug("Sending subsystem: %.*s",
1990                             len, (u_char*)buffer_ptr(cmd));
1991                         channel_request_start(id, "subsystem", 1);
1992                         client_expect_confirm(id, "subsystem", 1);
1993                 } else {
1994                         debug("Sending command: %.*s",
1995                             len, (u_char*)buffer_ptr(cmd));
1996                         channel_request_start(id, "exec", 1);
1997                         client_expect_confirm(id, "exec", 1);
1998                 }
1999                 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2000                 packet_send();
2001         } else {
2002                 channel_request_start(id, "shell", 1);
2003                 client_expect_confirm(id, "shell", 1);
2004                 packet_send();
2005         }
2006 }
2007
2008 static void
2009 client_init_dispatch_20(void)
2010 {
2011         dispatch_init(&dispatch_protocol_error);
2012
2013         dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2014         dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2015         dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2016         dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2017         dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2018         dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2019         dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2020         dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2021         dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2022         dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2023         dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2024         dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2025
2026         /* rekeying */
2027         dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2028
2029         /* global request reply messages */
2030         dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2031         dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2032 }
2033
2034 static void
2035 client_init_dispatch_13(void)
2036 {
2037         dispatch_init(NULL);
2038         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2039         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2040         dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2041         dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2042         dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2043         dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2044         dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2045         dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2046         dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2047
2048         dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2049             &client_input_agent_open : &deny_input_open);
2050         dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2051             &x11_input_open : &deny_input_open);
2052 }
2053
2054 static void
2055 client_init_dispatch_15(void)
2056 {
2057         client_init_dispatch_13();
2058         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2059         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2060 }
2061
2062 static void
2063 client_init_dispatch(void)
2064 {
2065         if (compat20)
2066                 client_init_dispatch_20();
2067         else if (compat13)
2068                 client_init_dispatch_13();
2069         else
2070                 client_init_dispatch_15();
2071 }
2072
2073 /* client specific fatal cleanup */
2074 void
2075 cleanup_exit(int i)
2076 {
2077         leave_raw_mode();
2078         leave_non_blocking();
2079         if (options.control_path != NULL && muxserver_sock != -1)
2080                 unlink(options.control_path);
2081         _exit(i);
2082 }