clientloop.c

   1 /* $OpenBSD: clientloop.c,v 1.216 2010/01/09 05:04:24 djm Exp $ */
   2 /*
   3  * Author: Tatu Ylonen <ylo@cs.hut.fi>
   4  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   5  *                    All rights reserved
   6  * The main loop for the interactive session (client side).
   7  *
   8  * As far as I am concerned, the code I have written for this software
   9  * can be used freely for any purpose.  Any derived versions of this
  10  * software must be clearly marked as such, and if the derived work is
  11  * incompatible with the protocol description in the RFC file, it must be
  12  * called by a name other than "ssh" or "Secure Shell".
  13  *
  14  *
  15  * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions
  19  * are met:
  20  * 1. Redistributions of source code must retain the above copyright
  21  *    notice, this list of conditions and the following disclaimer.
  22  * 2. Redistributions in binary form must reproduce the above copyright
  23  *    notice, this list of conditions and the following disclaimer in the
  24  *    documentation and/or other materials provided with the distribution.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  27  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  28  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  29  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  30  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  31  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  35  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  *
  38  * SSH2 support added by Markus Friedl.
  39  * Copyright (c) 1999, 2000, 2001 Markus Friedl.  All rights reserved.
  40  *
  41  * Redistribution and use in source and binary forms, with or without
  42  * modification, are permitted provided that the following conditions
  43  * are met:
  44  * 1. Redistributions of source code must retain the above copyright
  45  *    notice, this list of conditions and the following disclaimer.
  46  * 2. Redistributions in binary form must reproduce the above copyright
  47  *    notice, this list of conditions and the following disclaimer in the
  48  *    documentation and/or other materials provided with the distribution.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  51  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  52  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  53  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  54  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  55  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  56  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  57  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  58  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  59  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  60  */
  61
  62 #include "includes.h"
  63
  64 #include <sys/types.h>
  65 #include <sys/ioctl.h>
  66 #include <sys/param.h>
  67 #ifdef HAVE_SYS_STAT_H
  68 # include <sys/stat.h>
  69 #endif
  70 #ifdef HAVE_SYS_TIME_H
  71 # include <sys/time.h>
  72 #endif
  73 #include <sys/socket.h>
  74
  75 #include <ctype.h>
  76 #include <errno.h>
  77 #ifdef HAVE_PATHS_H
  78 #include <paths.h>
  79 #endif
  80 #include <signal.h>
  81 #include <stdarg.h>
  82 #include <stdio.h>
  83 #include <stdlib.h>
  84 #include <string.h>
  85 #include <termios.h>
  86 #include <pwd.h>
  87 #include <unistd.h>
  88
  89 #include "openbsd-compat/sys-queue.h"
  90 #include "xmalloc.h"
  91 #include "ssh.h"
  92 #include "ssh1.h"
  93 #include "ssh2.h"
  94 #include "packet.h"
  95 #include "buffer.h"
  96 #include "compat.h"
  97 #include "channels.h"
  98 #include "dispatch.h"
  99 #include "key.h"
 100 #include "cipher.h"
 101 #include "kex.h"
 102 #include "log.h"
 103 #include "readconf.h"
 104 #include "clientloop.h"
 105 #include "sshconnect.h"
 106 #include "authfd.h"
 107 #include "atomicio.h"
 108 #include "sshpty.h"
 109 #include "misc.h"
 110 #include "match.h"
 111 #include "msg.h"
 112 #include "roaming.h"
 113
 114 /* import options */
 115 extern Options options;
 116
 117 /* Flag indicating that stdin should be redirected from /dev/null. */
 118 extern int stdin_null_flag;
 119
 120 /* Flag indicating that no shell has been requested */
 121 extern int no_shell_flag;
 122
 123 /* Control socket */
 124 extern int muxserver_sock;
 125
 126 /*
 127  * Name of the host we are connecting to.  This is the name given on the
 128  * command line, or the HostName specified for the user-supplied name in a
 129  * configuration file.
 130  */
 131 extern char *host;
 132
 133 /* Force TTY allocation */
 134 extern int force_tty_flag;
 135
 136 /*
 137  * Flag to indicate that we have received a window change signal which has
 138  * not yet been processed.  This will cause a message indicating the new
 139  * window size to be sent to the server a little later.  This is volatile
 140  * because this is updated in a signal handler.
 141  */
 142 static volatile sig_atomic_t received_window_change_signal = 0;
 143 static volatile sig_atomic_t received_signal = 0;
 144
 145 /* Flag indicating whether the user's terminal is in non-blocking mode. */
 146 static int in_non_blocking_mode = 0;
 147
 148 /* Common data for the client loop code. */
 149 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 int     session_resumed = 0;
 168
 169 /* Track escape per proto2 channel */
 170 struct escape_filter_ctx {
 171         int escape_pending;
 172         int escape_char;
 173 };
 174
 175 /* Context for channel confirmation replies */
 176 struct channel_reply_ctx {
 177         const char *request_type;
 178         int id, do_close;
 179 };
 180
 181 /* Global request success/failure callbacks */
 182 struct global_confirm {
 183         TAILQ_ENTRY(global_confirm) entry;
 184         global_confirm_cb *cb;
 185         void *ctx;
 186         int ref_count;
 187 };
 188 TAILQ_HEAD(global_confirms, global_confirm);
 189 static struct global_confirms global_confirms =
 190     TAILQ_HEAD_INITIALIZER(global_confirms);
 191
 192 /*XXX*/
 193 extern Kex *xxx_kex;
 194
 195 void ssh_process_session2_setup(int, int, int, Buffer *);
 196
 197 /* Restores stdin to blocking mode. */
 198
 199 static void
 200 leave_non_blocking(void)
 201 {
 202         if (in_non_blocking_mode) {
 203                 unset_nonblock(fileno(stdin));
 204                 in_non_blocking_mode = 0;
 205         }
 206 }
 207
 208 /* Puts stdin terminal in non-blocking mode. */
 209
 210 static void
 211 enter_non_blocking(void)
 212 {
 213         in_non_blocking_mode = 1;
 214         set_nonblock(fileno(stdin));
 215 }
 216
 217 /*
 218  * Signal handler for the window change signal (SIGWINCH).  This just sets a
 219  * flag indicating that the window has changed.
 220  */
 221 /*ARGSUSED */
 222 static void
 223 window_change_handler(int sig)
 224 {
 225         received_window_change_signal = 1;
 226         signal(SIGWINCH, window_change_handler);
 227 }
 228
 229 /*
 230  * Signal handler for signals that cause the program to terminate.  These
 231  * signals must be trapped to restore terminal modes.
 232  */
 233 /*ARGSUSED */
 234 static void
 235 signal_handler(int sig)
 236 {
 237         received_signal = sig;
 238         quit_pending = 1;
 239 }
 240
 241 /*
 242  * Returns current time in seconds from Jan 1, 1970 with the maximum
 243  * available resolution.
 244  */
 245
 246 static double
 247 get_current_time(void)
 248 {
 249         struct timeval tv;
 250         gettimeofday(&tv, NULL);
 251         return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
 252 }
 253
 254 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
 255 void
 256 client_x11_get_proto(const char *display, const char *xauth_path,
 257     u_int trusted, char **_proto, char **_data)
 258 {
 259         char cmd[1024];
 260         char line[512];
 261         char xdisplay[512];
 262         static char proto[512], data[512];
 263         FILE *f;
 264         int got_data = 0, generated = 0, do_unlink = 0, i;
 265         char *xauthdir, *xauthfile;
 266         struct stat st;
 267
 268         xauthdir = xauthfile = NULL;
 269         *_proto = proto;
 270         *_data = data;
 271         proto[0] = data[0] = '\0';
 272
 273         if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
 274                 debug("No xauth program.");
 275         } else {
 276                 if (display == NULL) {
 277                         debug("x11_get_proto: DISPLAY not set");
 278                         return;
 279                 }
 280                 /*
 281                  * Handle FamilyLocal case where $DISPLAY does
 282                  * not match an authorization entry.  For this we
 283                  * just try "xauth list unix:displaynum.screennum".
 284                  * XXX: "localhost" match to determine FamilyLocal
 285                  *      is not perfect.
 286                  */
 287                 if (strncmp(display, "localhost:", 10) == 0) {
 288                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
 289                             display + 10);
 290                         display = xdisplay;
 291                 }
 292                 if (trusted == 0) {
 293                         xauthdir = xmalloc(MAXPATHLEN);
 294                         xauthfile = xmalloc(MAXPATHLEN);
 295                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
 296                         if (mkdtemp(xauthdir) != NULL) {
 297                                 do_unlink = 1;
 298                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
 299                                     xauthdir);
 300                                 snprintf(cmd, sizeof(cmd),
 301                                     "%s -f %s generate %s " SSH_X11_PROTO
 302                                     " untrusted timeout 1200 2>" _PATH_DEVNULL,
 303                                     xauth_path, xauthfile, display);
 304                                 debug2("x11_get_proto: %s", cmd);
 305                                 if (system(cmd) == 0)
 306                                         generated = 1;
 307                         }
 308                 }
 309
 310                 /*
 311                  * When in untrusted mode, we read the cookie only if it was
 312                  * successfully generated as an untrusted one in the step
 313                  * above.
 314                  */
 315                 if (trusted || generated) {
 316                         snprintf(cmd, sizeof(cmd),
 317                             "%s %s%s list %s 2>" _PATH_DEVNULL,
 318                             xauth_path,
 319                             generated ? "-f " : "" ,
 320                             generated ? xauthfile : "",
 321                             display);
 322                         debug2("x11_get_proto: %s", cmd);
 323                         f = popen(cmd, "r");
 324                         if (f && fgets(line, sizeof(line), f) &&
 325                             sscanf(line, "%*s %511s %511s", proto, data) == 2)
 326                                 got_data = 1;
 327                         if (f)
 328                                 pclose(f);
 329                 } else
 330                         error("Warning: untrusted X11 forwarding setup failed: "
 331                             "xauth key data not generated");
 332         }
 333
 334         if (do_unlink) {
 335                 unlink(xauthfile);
 336                 rmdir(xauthdir);
 337         }
 338         if (xauthdir)
 339                 xfree(xauthdir);
 340         if (xauthfile)
 341                 xfree(xauthfile);
 342
 343         /*
 344          * If we didn't get authentication data, just make up some
 345          * data.  The forwarding code will check the validity of the
 346          * response anyway, and substitute this data.  The X11
 347          * server, however, will ignore this fake data and use
 348          * whatever authentication mechanisms it was using otherwise
 349          * for the local connection.
 350          */
 351         if (!got_data) {
 352                 u_int32_t rnd = 0;
 353
 354                 logit("Warning: No xauth data; "
 355                     "using fake authentication data for X11 forwarding.");
 356                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
 357                 for (i = 0; i < 16; i++) {
 358                         if (i % 4 == 0)
 359                                 rnd = arc4random();
 360                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
 361                             rnd & 0xff);
 362                         rnd >>= 8;
 363                 }
 364         }
 365 }
 366
 367 /*
 368  * This is called when the interactive is entered.  This checks if there is
 369  * an EOF coming on stdin.  We must check this explicitly, as select() does
 370  * not appear to wake up when redirecting from /dev/null.
 371  */
 372
 373 static void
 374 client_check_initial_eof_on_stdin(void)
 375 {
 376         int len;
 377         char buf[1];
 378
 379         /*
 380          * If standard input is to be "redirected from /dev/null", we simply
 381          * mark that we have seen an EOF and send an EOF message to the
 382          * server. Otherwise, we try to read a single character; it appears
 383          * that for some files, such /dev/null, select() never wakes up for
 384          * read for this descriptor, which means that we never get EOF.  This
 385          * way we will get the EOF if stdin comes from /dev/null or similar.
 386          */
 387         if (stdin_null_flag) {
 388                 /* Fake EOF on stdin. */
 389                 debug("Sending eof.");
 390                 stdin_eof = 1;
 391                 packet_start(SSH_CMSG_EOF);
 392                 packet_send();
 393         } else {
 394                 enter_non_blocking();
 395
 396                 /* Check for immediate EOF on stdin. */
 397                 len = read(fileno(stdin), buf, 1);
 398                 if (len == 0) {
 399                         /*
 400                          * EOF.  Record that we have seen it and send
 401                          * EOF to server.
 402                          */
 403                         debug("Sending eof.");
 404                         stdin_eof = 1;
 405                         packet_start(SSH_CMSG_EOF);
 406                         packet_send();
 407                 } else if (len > 0) {
 408                         /*
 409                          * Got data.  We must store the data in the buffer,
 410                          * and also process it as an escape character if
 411                          * appropriate.
 412                          */
 413                         if ((u_char) buf[0] == escape_char1)
 414                                 escape_pending1 = 1;
 415                         else
 416                                 buffer_append(&stdin_buffer, buf, 1);
 417                 }
 418                 leave_non_blocking();
 419         }
 420 }
 421
 422
 423 /*
 424  * Make packets from buffered stdin data, and buffer them for sending to the
 425  * connection.
 426  */
 427
 428 static void
 429 client_make_packets_from_stdin_data(void)
 430 {
 431         u_int len;
 432
 433         /* Send buffered stdin data to the server. */
 434         while (buffer_len(&stdin_buffer) > 0 &&
 435             packet_not_very_much_data_to_write()) {
 436                 len = buffer_len(&stdin_buffer);
 437                 /* Keep the packets at reasonable size. */
 438                 if (len > packet_get_maxsize())
 439                         len = packet_get_maxsize();
 440                 packet_start(SSH_CMSG_STDIN_DATA);
 441                 packet_put_string(buffer_ptr(&stdin_buffer), len);
 442                 packet_send();
 443                 buffer_consume(&stdin_buffer, len);
 444                 /* If we have a pending EOF, send it now. */
 445                 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
 446                         packet_start(SSH_CMSG_EOF);
 447                         packet_send();
 448                 }
 449         }
 450 }
 451
 452 /*
 453  * Checks if the client window has changed, and sends a packet about it to
 454  * the server if so.  The actual change is detected elsewhere (by a software
 455  * interrupt on Unix); this just checks the flag and sends a message if
 456  * appropriate.
 457  */
 458
 459 static void
 460 client_check_window_change(void)
 461 {
 462         struct winsize ws;
 463
 464         if (! received_window_change_signal)
 465                 return;
 466         /** XXX race */
 467         received_window_change_signal = 0;
 468
 469         debug2("client_check_window_change: changed");
 470
 471         if (compat20) {
 472                 channel_send_window_changes();
 473         } else {
 474                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
 475                         return;
 476                 packet_start(SSH_CMSG_WINDOW_SIZE);
 477                 packet_put_int((u_int)ws.ws_row);
 478                 packet_put_int((u_int)ws.ws_col);
 479                 packet_put_int((u_int)ws.ws_xpixel);
 480                 packet_put_int((u_int)ws.ws_ypixel);
 481                 packet_send();
 482         }
 483 }
 484
 485 static void
 486 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
 487 {
 488         struct global_confirm *gc;
 489
 490         if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
 491                 return;
 492         if (gc->cb != NULL)
 493                 gc->cb(type, seq, gc->ctx);
 494         if (--gc->ref_count <= 0) {
 495                 TAILQ_REMOVE(&global_confirms, gc, entry);
 496                 bzero(gc, sizeof(*gc));
 497                 xfree(gc);
 498         }
 499
 500         packet_set_alive_timeouts(0);
 501 }
 502
 503 static void
 504 server_alive_check(void)
 505 {
 506         if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
 507                 logit("Timeout, server not responding.");
 508                 cleanup_exit(255);
 509         }
 510         packet_start(SSH2_MSG_GLOBAL_REQUEST);
 511         packet_put_cstring("keepalive@openssh.com");
 512         packet_put_char(1);     /* boolean: want reply */
 513         packet_send();
 514         /* Insert an empty placeholder to maintain ordering */
 515         client_register_global_confirm(NULL, NULL);
 516 }
 517
 518 /*
 519  * Waits until the client can do something (some data becomes available on
 520  * one of the file descriptors).
 521  */
 522 static void
 523 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
 524     int *maxfdp, u_int *nallocp, int rekeying)
 525 {
 526         struct timeval tv, *tvp;
 527         int ret;
 528
 529         /* Add any selections by the channel mechanism. */
 530         channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
 531
 532         if (!compat20) {
 533                 /* Read from the connection, unless our buffers are full. */
 534                 if (buffer_len(&stdout_buffer) < buffer_high &&
 535                     buffer_len(&stderr_buffer) < buffer_high &&
 536                     channel_not_very_much_buffered_data())
 537                         FD_SET(connection_in, *readsetp);
 538                 /*
 539                  * Read from stdin, unless we have seen EOF or have very much
 540                  * buffered data to send to the server.
 541                  */
 542                 if (!stdin_eof && packet_not_very_much_data_to_write())
 543                         FD_SET(fileno(stdin), *readsetp);
 544
 545                 /* Select stdout/stderr if have data in buffer. */
 546                 if (buffer_len(&stdout_buffer) > 0)
 547                         FD_SET(fileno(stdout), *writesetp);
 548                 if (buffer_len(&stderr_buffer) > 0)
 549                         FD_SET(fileno(stderr), *writesetp);
 550         } else {
 551                 /* channel_prepare_select could have closed the last channel */
 552                 if (session_closed && !channel_still_open() &&
 553                     !packet_have_data_to_write()) {
 554                         /* clear mask since we did not call select() */
 555                         memset(*readsetp, 0, *nallocp);
 556                         memset(*writesetp, 0, *nallocp);
 557                         return;
 558                 } else {
 559                         FD_SET(connection_in, *readsetp);
 560                 }
 561         }
 562
 563         /* Select server connection if have data to write to the server. */
 564         if (packet_have_data_to_write())
 565                 FD_SET(connection_out, *writesetp);
 566
 567         if (muxserver_sock != -1)
 568                 FD_SET(muxserver_sock, *readsetp);
 569
 570         /*
 571          * Wait for something to happen.  This will suspend the process until
 572          * some selected descriptor can be read, written, or has some other
 573          * event pending.
 574          */
 575
 576         if (options.server_alive_interval == 0 || !compat20)
 577                 tvp = NULL;
 578         else {
 579                 tv.tv_sec = options.server_alive_interval;
 580                 tv.tv_usec = 0;
 581                 tvp = &tv;
 582         }
 583         ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
 584         if (ret < 0) {
 585                 char buf[100];
 586
 587                 /*
 588                  * We have to clear the select masks, because we return.
 589                  * We have to return, because the mainloop checks for the flags
 590                  * set by the signal handlers.
 591                  */
 592                 memset(*readsetp, 0, *nallocp);
 593                 memset(*writesetp, 0, *nallocp);
 594
 595                 if (errno == EINTR)
 596                         return;
 597                 /* Note: we might still have data in the buffers. */
 598                 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
 599                 buffer_append(&stderr_buffer, buf, strlen(buf));
 600                 quit_pending = 1;
 601         } else if (ret == 0)
 602                 server_alive_check();
 603 }
 604
 605 static void
 606 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
 607 {
 608         /* Flush stdout and stderr buffers. */
 609         if (buffer_len(bout) > 0)
 610                 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
 611                     buffer_len(bout));
 612         if (buffer_len(berr) > 0)
 613                 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
 614                     buffer_len(berr));
 615
 616         leave_raw_mode(force_tty_flag);
 617
 618         /*
 619          * Free (and clear) the buffer to reduce the amount of data that gets
 620          * written to swap.
 621          */
 622         buffer_free(bin);
 623         buffer_free(bout);
 624         buffer_free(berr);
 625
 626         /* Send the suspend signal to the program itself. */
 627         kill(getpid(), SIGTSTP);
 628
 629         /* Reset window sizes in case they have changed */
 630         received_window_change_signal = 1;
 631
 632         /* OK, we have been continued by the user. Reinitialize buffers. */
 633         buffer_init(bin);
 634         buffer_init(bout);
 635         buffer_init(berr);
 636
 637         enter_raw_mode(force_tty_flag);
 638 }
 639
 640 static void
 641 client_process_net_input(fd_set *readset)
 642 {
 643         int len, cont = 0;
 644         char buf[SSH_IOBUFSZ];
 645
 646         /*
 647          * Read input from the server, and add any such data to the buffer of
 648          * the packet subsystem.
 649          */
 650         if (FD_ISSET(connection_in, readset)) {
 651                 /* Read as much as possible. */
 652                 len = roaming_read(connection_in, buf, sizeof(buf), &cont);
 653                 if (len == 0 && cont == 0) {
 654                         /*
 655                          * Received EOF.  The remote host has closed the
 656                          * connection.
 657                          */
 658                         snprintf(buf, sizeof buf,
 659                             "Connection to %.300s closed by remote host.\r\n",
 660                             host);
 661                         buffer_append(&stderr_buffer, buf, strlen(buf));
 662                         quit_pending = 1;
 663                         return;
 664                 }
 665                 /*
 666                  * There is a kernel bug on Solaris that causes select to
 667                  * sometimes wake up even though there is no data available.
 668                  */
 669                 if (len < 0 &&
 670                     (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
 671                         len = 0;
 672
 673                 if (len < 0) {
 674                         /*
 675                          * An error has encountered.  Perhaps there is a
 676                          * network problem.
 677                          */
 678                         snprintf(buf, sizeof buf,
 679                             "Read from remote host %.300s: %.100s\r\n",
 680                             host, strerror(errno));
 681                         buffer_append(&stderr_buffer, buf, strlen(buf));
 682                         quit_pending = 1;
 683                         return;
 684                 }
 685                 packet_process_incoming(buf, len);
 686         }
 687 }
 688
 689 static void
 690 client_status_confirm(int type, Channel *c, void *ctx)
 691 {
 692         struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
 693         char errmsg[256];
 694         int tochan;
 695
 696         /* XXX supress on mux _client_ quietmode */
 697         tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
 698             c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
 699
 700         if (type == SSH2_MSG_CHANNEL_SUCCESS) {
 701                 debug2("%s request accepted on channel %d",
 702                     cr->request_type, c->self);
 703         } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
 704                 if (tochan) {
 705                         snprintf(errmsg, sizeof(errmsg),
 706                             "%s request failed\r\n", cr->request_type);
 707                 } else {
 708                         snprintf(errmsg, sizeof(errmsg),
 709                             "%s request failed on channel %d",
 710                             cr->request_type, c->self);
 711                 }
 712                 /* If error occurred on primary session channel, then exit */
 713                 if (cr->do_close && c->self == session_ident)
 714                         fatal("%s", errmsg);
 715                 /* If error occurred on mux client, append to their stderr */
 716                 if (tochan)
 717                         buffer_append(&c->extended, errmsg, strlen(errmsg));
 718                 else
 719                         error("%s", errmsg);
 720                 if (cr->do_close) {
 721                         chan_read_failed(c);
 722                         chan_write_failed(c);
 723                 }
 724         }
 725         xfree(cr);
 726 }
 727
 728 static void
 729 client_abandon_status_confirm(Channel *c, void *ctx)
 730 {
 731         xfree(ctx);
 732 }
 733
 734 static void
 735 client_expect_confirm(int id, const char *request, int do_close)
 736 {
 737         struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
 738
 739         cr->request_type = request;
 740         cr->do_close = do_close;
 741
 742         channel_register_status_confirm(id, client_status_confirm,
 743             client_abandon_status_confirm, cr);
 744 }
 745
 746 void
 747 client_register_global_confirm(global_confirm_cb *cb, void *ctx)
 748 {
 749         struct global_confirm *gc, *last_gc;
 750
 751         /* Coalesce identical callbacks */
 752         last_gc = TAILQ_LAST(&global_confirms, global_confirms);
 753         if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
 754                 if (++last_gc->ref_count >= INT_MAX)
 755                         fatal("%s: last_gc->ref_count = %d",
 756                             __func__, last_gc->ref_count);
 757                 return;
 758         }
 759
 760         gc = xmalloc(sizeof(*gc));
 761         gc->cb = cb;
 762         gc->ctx = ctx;
 763         gc->ref_count = 1;
 764         TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
 765 }
 766
 767 static void
 768 process_cmdline(void)
 769 {
 770         void (*handler)(int);
 771         char *s, *cmd, *cancel_host;
 772         int delete = 0;
 773         int local = 0, remote = 0, dynamic = 0;
 774         int cancel_port;
 775         Forward fwd;
 776
 777         bzero(&fwd, sizeof(fwd));
 778         fwd.listen_host = fwd.connect_host = NULL;
 779
 780         leave_raw_mode(force_tty_flag);
 781         handler = signal(SIGINT, SIG_IGN);
 782         cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
 783         if (s == NULL)
 784                 goto out;
 785         while (isspace(*s))
 786                 s++;
 787         if (*s == '-')
 788                 s++;    /* Skip cmdline '-', if any */
 789         if (*s == '\0')
 790                 goto out;
 791
 792         if (*s == 'h' || *s == 'H' || *s == '?') {
 793                 logit("Commands:");
 794                 logit("      -L[bind_address:]port:host:hostport    "
 795                     "Request local forward");
 796                 logit("      -R[bind_address:]port:host:hostport    "
 797                     "Request remote forward");
 798                 logit("      -D[bind_address:]port                  "
 799                     "Request dynamic forward");
 800                 logit("      -KR[bind_address:]port                 "
 801                     "Cancel remote forward");
 802                 if (!options.permit_local_command)
 803                         goto out;
 804                 logit("      !args                                  "
 805                     "Execute local command");
 806                 goto out;
 807         }
 808
 809         if (*s == '!' && options.permit_local_command) {
 810                 s++;
 811                 ssh_local_cmd(s);
 812                 goto out;
 813         }
 814
 815         if (*s == 'K') {
 816                 delete = 1;
 817                 s++;
 818         }
 819         if (*s == 'L')
 820                 local = 1;
 821         else if (*s == 'R')
 822                 remote = 1;
 823         else if (*s == 'D')
 824                 dynamic = 1;
 825         else {
 826                 logit("Invalid command.");
 827                 goto out;
 828         }
 829
 830         if ((local || dynamic) && delete) {
 831                 logit("Not supported.");
 832                 goto out;
 833         }
 834         if (remote && delete && !compat20) {
 835                 logit("Not supported for SSH protocol version 1.");
 836                 goto out;
 837         }
 838
 839         while (isspace(*++s))
 840                 ;
 841
 842         if (delete) {
 843                 cancel_port = 0;
 844                 cancel_host = hpdelim(&s);      /* may be NULL */
 845                 if (s != NULL) {
 846                         cancel_port = a2port(s);
 847                         cancel_host = cleanhostname(cancel_host);
 848                 } else {
 849                         cancel_port = a2port(cancel_host);
 850                         cancel_host = NULL;
 851                 }
 852                 if (cancel_port <= 0) {
 853                         logit("Bad forwarding close port");
 854                         goto out;
 855                 }
 856                 channel_request_rforward_cancel(cancel_host, cancel_port);
 857         } else {
 858                 if (!parse_forward(&fwd, s, dynamic, remote)) {
 859                         logit("Bad forwarding specification.");
 860                         goto out;
 861                 }
 862                 if (local || dynamic) {
 863                         if (channel_setup_local_fwd_listener(fwd.listen_host,
 864                             fwd.listen_port, fwd.connect_host,
 865                             fwd.connect_port, options.gateway_ports) < 0) {
 866                                 logit("Port forwarding failed.");
 867                                 goto out;
 868                         }
 869                 } else {
 870                         if (channel_request_remote_forwarding(fwd.listen_host,
 871                             fwd.listen_port, fwd.connect_host,
 872                             fwd.connect_port) < 0) {
 873                                 logit("Port forwarding failed.");
 874                                 goto out;
 875                         }
 876                 }
 877
 878                 logit("Forwarding port.");
 879         }
 880
 881 out:
 882         signal(SIGINT, handler);
 883         enter_raw_mode(force_tty_flag);
 884         if (cmd)
 885                 xfree(cmd);
 886         if (fwd.listen_host != NULL)
 887                 xfree(fwd.listen_host);
 888         if (fwd.connect_host != NULL)
 889                 xfree(fwd.connect_host);
 890 }
 891
 892 /*
 893  * Process the characters one by one, call with c==NULL for proto1 case.
 894  */
 895 static int
 896 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
 897     char *buf, int len)
 898 {
 899         char string[1024];
 900         pid_t pid;
 901         int bytes = 0;
 902         u_int i;
 903         u_char ch;
 904         char *s;
 905         int *escape_pendingp, escape_char;
 906         struct escape_filter_ctx *efc;
 907
 908         if (c == NULL) {
 909                 escape_pendingp = &escape_pending1;
 910                 escape_char = escape_char1;
 911         } else {
 912                 if (c->filter_ctx == NULL)
 913                         return 0;
 914                 efc = (struct escape_filter_ctx *)c->filter_ctx;
 915                 escape_pendingp = &efc->escape_pending;
 916                 escape_char = efc->escape_char;
 917         }
 918
 919         if (len <= 0)
 920                 return (0);
 921
 922         for (i = 0; i < (u_int)len; i++) {
 923                 /* Get one character at a time. */
 924                 ch = buf[i];
 925
 926                 if (*escape_pendingp) {
 927                         /* We have previously seen an escape character. */
 928                         /* Clear the flag now. */
 929                         *escape_pendingp = 0;
 930
 931                         /* Process the escaped character. */
 932                         switch (ch) {
 933                         case '.':
 934                                 /* Terminate the connection. */
 935                                 snprintf(string, sizeof string, "%c.\r\n",
 936                                     escape_char);
 937                                 buffer_append(berr, string, strlen(string));
 938
 939                                 if (c && c->ctl_fd != -1) {
 940                                         chan_read_failed(c);
 941                                         chan_write_failed(c);
 942                                         return 0;
 943                                 } else
 944                                         quit_pending = 1;
 945                                 return -1;
 946
 947                         case 'Z' - 64:
 948                                 /* XXX support this for mux clients */
 949                                 if (c && c->ctl_fd != -1) {
 950  noescape:
 951                                         snprintf(string, sizeof string,
 952                                             "%c%c escape not available to "
 953                                             "multiplexed sessions\r\n",
 954                                             escape_char, ch);
 955                                         buffer_append(berr, string,
 956                                             strlen(string));
 957                                         continue;
 958                                 }
 959                                 /* Suspend the program. Inform the user */
 960                                 snprintf(string, sizeof string,
 961                                     "%c^Z [suspend ssh]\r\n", escape_char);
 962                                 buffer_append(berr, string, strlen(string));
 963
 964                                 /* Restore terminal modes and suspend. */
 965                                 client_suspend_self(bin, bout, berr);
 966
 967                                 /* We have been continued. */
 968                                 continue;
 969
 970                         case 'B':
 971                                 if (compat20) {
 972                                         snprintf(string, sizeof string,
 973                                             "%cB\r\n", escape_char);
 974                                         buffer_append(berr, string,
 975                                             strlen(string));
 976                                         channel_request_start(session_ident,
 977                                             "break", 0);
 978                                         packet_put_int(1000);
 979                                         packet_send();
 980                                 }
 981                                 continue;
 982
 983                         case 'R':
 984                                 if (compat20) {
 985                                         if (datafellows & SSH_BUG_NOREKEY)
 986                                                 logit("Server does not "
 987                                                     "support re-keying");
 988                                         else
 989                                                 need_rekeying = 1;
 990                                 }
 991                                 continue;
 992
 993                         case '&':
 994                                 if (c && c->ctl_fd != -1)
 995                                         goto noescape;
 996                                 /*
 997                                  * Detach the program (continue to serve
 998                                  * connections, but put in background and no
 999                                  * more new connections).
1000                                  */
1001                                 /* Restore tty modes. */
1002                                 leave_raw_mode(force_tty_flag);
1003
1004                                 /* Stop listening for new connections. */
1005                                 channel_stop_listening();
1006
1007                                 snprintf(string, sizeof string,
1008                                     "%c& [backgrounded]\n", escape_char);
1009                                 buffer_append(berr, string, strlen(string));
1010
1011                                 /* Fork into background. */
1012                                 pid = fork();
1013                                 if (pid < 0) {
1014                                         error("fork: %.100s", strerror(errno));
1015                                         continue;
1016                                 }
1017                                 if (pid != 0) { /* This is the parent. */
1018                                         /* The parent just exits. */
1019                                         exit(0);
1020                                 }
1021                                 /* The child continues serving connections. */
1022                                 if (compat20) {
1023                                         buffer_append(bin, "\004", 1);
1024                                         /* fake EOF on stdin */
1025                                         return -1;
1026                                 } else if (!stdin_eof) {
1027                                         /*
1028                                          * Sending SSH_CMSG_EOF alone does not
1029                                          * always appear to be enough.  So we
1030                                          * try to send an EOF character first.
1031                                          */
1032                                         packet_start(SSH_CMSG_STDIN_DATA);
1033                                         packet_put_string("\004", 1);
1034                                         packet_send();
1035                                         /* Close stdin. */
1036                                         stdin_eof = 1;
1037                                         if (buffer_len(bin) == 0) {
1038                                                 packet_start(SSH_CMSG_EOF);
1039                                                 packet_send();
1040                                         }
1041                                 }
1042                                 continue;
1043
1044                         case '?':
1045                                 if (c && c->ctl_fd != -1) {
1046                                         snprintf(string, sizeof string,
1047 "%c?\r\n\
1048 Supported escape sequences:\r\n\
1049   %c.  - terminate session\r\n\
1050   %cB  - send a BREAK to the remote system\r\n\
1051   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1052   %c#  - list forwarded connections\r\n\
1053   %c?  - this message\r\n\
1054   %c%c  - send the escape character by typing it twice\r\n\
1055 (Note that escapes are only recognized immediately after newline.)\r\n",
1056                                             escape_char, escape_char,
1057                                             escape_char, escape_char,
1058                                             escape_char, escape_char,
1059                                             escape_char, escape_char);
1060                                 } else {
1061                                         snprintf(string, sizeof string,
1062 "%c?\r\n\
1063 Supported escape sequences:\r\n\
1064   %c.  - terminate connection (and any multiplexed sessions)\r\n\
1065   %cB  - send a BREAK to the remote system\r\n\
1066   %cC  - open a command line\r\n\
1067   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1068   %c^Z - suspend ssh\r\n\
1069   %c#  - list forwarded connections\r\n\
1070   %c&  - background ssh (when waiting for connections to terminate)\r\n\
1071   %c?  - this message\r\n\
1072   %c%c  - send the escape character by typing it twice\r\n\
1073 (Note that escapes are only recognized immediately after newline.)\r\n",
1074                                             escape_char, escape_char,
1075                                             escape_char, escape_char,
1076                                             escape_char, escape_char,
1077                                             escape_char, escape_char,
1078                                             escape_char, escape_char,
1079                                             escape_char);
1080                                 }
1081                                 buffer_append(berr, string, strlen(string));
1082                                 continue;
1083
1084                         case '#':
1085                                 snprintf(string, sizeof string, "%c#\r\n",
1086                                     escape_char);
1087                                 buffer_append(berr, string, strlen(string));
1088                                 s = channel_open_message();
1089                                 buffer_append(berr, s, strlen(s));
1090                                 xfree(s);
1091                                 continue;
1092
1093                         case 'C':
1094                                 if (c && c->ctl_fd != -1)
1095                                         goto noescape;
1096                                 process_cmdline();
1097                                 continue;
1098
1099                         default:
1100                                 if (ch != escape_char) {
1101                                         buffer_put_char(bin, escape_char);
1102                                         bytes++;
1103                                 }
1104                                 /* Escaped characters fall through here */
1105                                 break;
1106                         }
1107                 } else {
1108                         /*
1109                          * The previous character was not an escape char.
1110                          * Check if this is an escape.
1111                          */
1112                         if (last_was_cr && ch == escape_char) {
1113                                 /*
1114                                  * It is. Set the flag and continue to
1115                                  * next character.
1116                                  */
1117                                 *escape_pendingp = 1;
1118                                 continue;
1119                         }
1120                 }
1121
1122                 /*
1123                  * Normal character.  Record whether it was a newline,
1124                  * and append it to the buffer.
1125                  */
1126                 last_was_cr = (ch == '\r' || ch == '\n');
1127                 buffer_put_char(bin, ch);
1128                 bytes++;
1129         }
1130         return bytes;
1131 }
1132
1133 static void
1134 client_process_input(fd_set *readset)
1135 {
1136         int len;
1137         char buf[SSH_IOBUFSZ];
1138
1139         /* Read input from stdin. */
1140         if (FD_ISSET(fileno(stdin), readset)) {
1141                 /* Read as much as possible. */
1142                 len = read(fileno(stdin), buf, sizeof(buf));
1143                 if (len < 0 &&
1144                     (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
1145                         return;         /* we'll try again later */
1146                 if (len <= 0) {
1147                         /*
1148                          * Received EOF or error.  They are treated
1149                          * similarly, except that an error message is printed
1150                          * if it was an error condition.
1151                          */
1152                         if (len < 0) {
1153                                 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1154                                     strerror(errno));
1155                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1156                         }
1157                         /* Mark that we have seen EOF. */
1158                         stdin_eof = 1;
1159                         /*
1160                          * Send an EOF message to the server unless there is
1161                          * data in the buffer.  If there is data in the
1162                          * buffer, no message will be sent now.  Code
1163                          * elsewhere will send the EOF when the buffer
1164                          * becomes empty if stdin_eof is set.
1165                          */
1166                         if (buffer_len(&stdin_buffer) == 0) {
1167                                 packet_start(SSH_CMSG_EOF);
1168                                 packet_send();
1169                         }
1170                 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1171                         /*
1172                          * Normal successful read, and no escape character.
1173                          * Just append the data to buffer.
1174                          */
1175                         buffer_append(&stdin_buffer, buf, len);
1176                 } else {
1177                         /*
1178                          * Normal, successful read.  But we have an escape
1179                          * character and have to process the characters one
1180                          * by one.
1181                          */
1182                         if (process_escapes(NULL, &stdin_buffer,
1183                             &stdout_buffer, &stderr_buffer, buf, len) == -1)
1184                                 return;
1185                 }
1186         }
1187 }
1188
1189 static void
1190 client_process_output(fd_set *writeset)
1191 {
1192         int len;
1193         char buf[100];
1194
1195         /* Write buffered output to stdout. */
1196         if (FD_ISSET(fileno(stdout), writeset)) {
1197                 /* Write as much data as possible. */
1198                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1199                     buffer_len(&stdout_buffer));
1200                 if (len <= 0) {
1201                         if (errno == EINTR || errno == EAGAIN ||
1202                             errno == EWOULDBLOCK)
1203                                 len = 0;
1204                         else {
1205                                 /*
1206                                  * An error or EOF was encountered.  Put an
1207                                  * error message to stderr buffer.
1208                                  */
1209                                 snprintf(buf, sizeof buf,
1210                                     "write stdout: %.50s\r\n", strerror(errno));
1211                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1212                                 quit_pending = 1;
1213                                 return;
1214                         }
1215                 }
1216                 /* Consume printed data from the buffer. */
1217                 buffer_consume(&stdout_buffer, len);
1218         }
1219         /* Write buffered output to stderr. */
1220         if (FD_ISSET(fileno(stderr), writeset)) {
1221                 /* Write as much data as possible. */
1222                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1223                     buffer_len(&stderr_buffer));
1224                 if (len <= 0) {
1225                         if (errno == EINTR || errno == EAGAIN ||
1226                             errno == EWOULDBLOCK)
1227                                 len = 0;
1228                         else {
1229                                 /*
1230                                  * EOF or error, but can't even print
1231                                  * error message.
1232                                  */
1233                                 quit_pending = 1;
1234                                 return;
1235                         }
1236                 }
1237                 /* Consume printed characters from the buffer. */
1238                 buffer_consume(&stderr_buffer, len);
1239         }
1240 }
1241
1242 /*
1243  * Get packets from the connection input buffer, and process them as long as
1244  * there are packets available.
1245  *
1246  * Any unknown packets received during the actual
1247  * session cause the session to terminate.  This is
1248  * intended to make debugging easier since no
1249  * confirmations are sent.  Any compatible protocol
1250  * extensions must be negotiated during the
1251  * preparatory phase.
1252  */
1253
1254 static void
1255 client_process_buffered_input_packets(void)
1256 {
1257         dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1258             compat20 ? xxx_kex : NULL);
1259 }
1260
1261 /* scan buf[] for '~' before sending data to the peer */
1262
1263 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1264 void *
1265 client_new_escape_filter_ctx(int escape_char)
1266 {
1267         struct escape_filter_ctx *ret;
1268
1269         ret = xmalloc(sizeof(*ret));
1270         ret->escape_pending = 0;
1271         ret->escape_char = escape_char;
1272         return (void *)ret;
1273 }
1274
1275 /* Free the escape filter context on channel free */
1276 void
1277 client_filter_cleanup(int cid, void *ctx)
1278 {
1279         xfree(ctx);
1280 }
1281
1282 int
1283 client_simple_escape_filter(Channel *c, char *buf, int len)
1284 {
1285         if (c->extended_usage != CHAN_EXTENDED_WRITE)
1286                 return 0;
1287
1288         return process_escapes(c, &c->input, &c->output, &c->extended,
1289             buf, len);
1290 }
1291
1292 static void
1293 client_channel_closed(int id, void *arg)
1294 {
1295         channel_cancel_cleanup(id);
1296         session_closed = 1;
1297         leave_raw_mode(force_tty_flag);
1298 }
1299
1300 /*
1301  * Implements the interactive session with the server.  This is called after
1302  * the user has been authenticated, and a command has been started on the
1303  * remote host.  If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1304  * used as an escape character for terminating or suspending the session.
1305  */
1306
1307 int
1308 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1309 {
1310         fd_set *readset = NULL, *writeset = NULL;
1311         double start_time, total_time;
1312         int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1313         u_int64_t ibytes, obytes;
1314         u_int nalloc = 0;
1315         char buf[100];
1316
1317         debug("Entering interactive session.");
1318
1319         start_time = get_current_time();
1320
1321         /* Initialize variables. */
1322         escape_pending1 = 0;
1323         last_was_cr = 1;
1324         exit_status = -1;
1325         stdin_eof = 0;
1326         buffer_high = 64 * 1024;
1327         connection_in = packet_get_connection_in();
1328         connection_out = packet_get_connection_out();
1329         max_fd = MAX(connection_in, connection_out);
1330         if (muxserver_sock != -1)
1331                 max_fd = MAX(max_fd, muxserver_sock);
1332
1333         if (!compat20) {
1334                 /* enable nonblocking unless tty */
1335                 if (!isatty(fileno(stdin)))
1336                         set_nonblock(fileno(stdin));
1337                 if (!isatty(fileno(stdout)))
1338                         set_nonblock(fileno(stdout));
1339                 if (!isatty(fileno(stderr)))
1340                         set_nonblock(fileno(stderr));
1341                 max_fd = MAX(max_fd, fileno(stdin));
1342                 max_fd = MAX(max_fd, fileno(stdout));
1343                 max_fd = MAX(max_fd, fileno(stderr));
1344         }
1345         quit_pending = 0;
1346         escape_char1 = escape_char_arg;
1347
1348         /* Initialize buffers. */
1349         buffer_init(&stdin_buffer);
1350         buffer_init(&stdout_buffer);
1351         buffer_init(&stderr_buffer);
1352
1353         client_init_dispatch();
1354
1355         /*
1356          * Set signal handlers, (e.g. to restore non-blocking mode)
1357          * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1358          */
1359         if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1360                 signal(SIGHUP, signal_handler);
1361         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1362                 signal(SIGINT, signal_handler);
1363         if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1364                 signal(SIGQUIT, signal_handler);
1365         if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1366                 signal(SIGTERM, signal_handler);
1367         signal(SIGWINCH, window_change_handler);
1368
1369         if (have_pty)
1370                 enter_raw_mode(force_tty_flag);
1371
1372         if (compat20) {
1373                 session_ident = ssh2_chan_id;
1374                 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1375                         channel_register_filter(session_ident,
1376                             client_simple_escape_filter, NULL,
1377                             client_filter_cleanup,
1378                             client_new_escape_filter_ctx(escape_char_arg));
1379                 if (session_ident != -1)
1380                         channel_register_cleanup(session_ident,
1381                             client_channel_closed, 0);
1382         } else {
1383                 /* Check if we should immediately send eof on stdin. */
1384                 client_check_initial_eof_on_stdin();
1385         }
1386
1387         /* Main loop of the client for the interactive session mode. */
1388         while (!quit_pending) {
1389
1390                 /* Process buffered packets sent by the server. */
1391                 client_process_buffered_input_packets();
1392
1393                 if (compat20 && session_closed && !channel_still_open())
1394                         break;
1395
1396                 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1397
1398                 if (rekeying) {
1399                         debug("rekeying in progress");
1400                 } else {
1401                         /*
1402                          * Make packets of buffered stdin data, and buffer
1403                          * them for sending to the server.
1404                          */
1405                         if (!compat20)
1406                                 client_make_packets_from_stdin_data();
1407
1408                         /*
1409                          * Make packets from buffered channel data, and
1410                          * enqueue them for sending to the server.
1411                          */
1412                         if (packet_not_very_much_data_to_write())
1413                                 channel_output_poll();
1414
1415                         /*
1416                          * Check if the window size has changed, and buffer a
1417                          * message about it to the server if so.
1418                          */
1419                         client_check_window_change();
1420
1421                         if (quit_pending)
1422                                 break;
1423                 }
1424                 /*
1425                  * Wait until we have something to do (something becomes
1426                  * available on one of the descriptors).
1427                  */
1428                 max_fd2 = max_fd;
1429                 client_wait_until_can_do_something(&readset, &writeset,
1430                     &max_fd2, &nalloc, rekeying);
1431
1432                 if (quit_pending)
1433                         break;
1434
1435                 /* Do channel operations unless rekeying in progress. */
1436                 if (!rekeying) {
1437                         channel_after_select(readset, writeset);
1438                         if (need_rekeying || packet_need_rekeying()) {
1439                                 debug("need rekeying");
1440                                 xxx_kex->done = 0;
1441                                 kex_send_kexinit(xxx_kex);
1442                                 need_rekeying = 0;
1443                         }
1444                 }
1445
1446                 /* Buffer input from the connection.  */
1447                 client_process_net_input(readset);
1448
1449                 /* Accept control connections.  */
1450                 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1451                         if (muxserver_accept_control())
1452                                 quit_pending = 1;
1453                 }
1454
1455                 if (quit_pending)
1456                         break;
1457
1458                 if (!compat20) {
1459                         /* Buffer data from stdin */
1460                         client_process_input(readset);
1461                         /*
1462                          * Process output to stdout and stderr.  Output to
1463                          * the connection is processed elsewhere (above).
1464                          */
1465                         client_process_output(writeset);
1466                 }
1467
1468                 if (session_resumed) {
1469                         connection_in = packet_get_connection_in();
1470                         connection_out = packet_get_connection_out();
1471                         max_fd = MAX(max_fd, connection_out);
1472                         max_fd = MAX(max_fd, connection_in);
1473                         session_resumed = 0;
1474                 }
1475
1476                 /*
1477                  * Send as much buffered packet data as possible to the
1478                  * sender.
1479                  */
1480                 if (FD_ISSET(connection_out, writeset))
1481                         packet_write_poll();
1482         }
1483         if (readset)
1484                 xfree(readset);
1485         if (writeset)
1486                 xfree(writeset);
1487
1488         /* Terminate the session. */
1489
1490         /* Stop watching for window change. */
1491         signal(SIGWINCH, SIG_DFL);
1492
1493         if (compat20) {
1494                 packet_start(SSH2_MSG_DISCONNECT);
1495                 packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1496                 packet_put_cstring("disconnected by user");
1497                 packet_send();
1498                 packet_write_wait();
1499         }
1500
1501         channel_free_all();
1502
1503         if (have_pty)
1504                 leave_raw_mode(force_tty_flag);
1505
1506         /* restore blocking io */
1507         if (!isatty(fileno(stdin)))
1508                 unset_nonblock(fileno(stdin));
1509         if (!isatty(fileno(stdout)))
1510                 unset_nonblock(fileno(stdout));
1511         if (!isatty(fileno(stderr)))
1512                 unset_nonblock(fileno(stderr));
1513
1514         /*
1515          * If there was no shell or command requested, there will be no remote
1516          * exit status to be returned.  In that case, clear error code if the
1517          * connection was deliberately terminated at this end.
1518          */
1519         if (no_shell_flag && received_signal == SIGTERM) {
1520                 received_signal = 0;
1521                 exit_status = 0;
1522         }
1523
1524         if (received_signal)
1525                 fatal("Killed by signal %d.", (int) received_signal);
1526
1527         /*
1528          * In interactive mode (with pseudo tty) display a message indicating
1529          * that the connection has been closed.
1530          */
1531         if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1532                 snprintf(buf, sizeof buf,
1533                     "Connection to %.64s closed.\r\n", host);
1534                 buffer_append(&stderr_buffer, buf, strlen(buf));
1535         }
1536
1537         /* Output any buffered data for stdout. */
1538         while (buffer_len(&stdout_buffer) > 0) {
1539                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1540                     buffer_len(&stdout_buffer));
1541                 if (len <= 0) {
1542                         error("Write failed flushing stdout buffer.");
1543                         break;
1544                 }
1545                 buffer_consume(&stdout_buffer, len);
1546         }
1547
1548         /* Output any buffered data for stderr. */
1549         while (buffer_len(&stderr_buffer) > 0) {
1550                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1551                     buffer_len(&stderr_buffer));
1552                 if (len <= 0) {
1553                         error("Write failed flushing stderr buffer.");
1554                         break;
1555                 }
1556                 buffer_consume(&stderr_buffer, len);
1557         }
1558
1559         /* Clear and free any buffers. */
1560         memset(buf, 0, sizeof(buf));
1561         buffer_free(&stdin_buffer);
1562         buffer_free(&stdout_buffer);
1563         buffer_free(&stderr_buffer);
1564
1565         /* Report bytes transferred, and transfer rates. */
1566         total_time = get_current_time() - start_time;
1567         packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1568         packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1569         verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1570             obytes, ibytes, total_time);
1571         if (total_time > 0)
1572                 verbose("Bytes per second: sent %.1f, received %.1f",
1573                     obytes / total_time, ibytes / total_time);
1574         /* Return the exit status of the program. */
1575         debug("Exit status %d", exit_status);
1576         return exit_status;
1577 }
1578
1579 /*********/
1580
1581 static void
1582 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1583 {
1584         u_int data_len;
1585         char *data = packet_get_string(&data_len);
1586         packet_check_eom();
1587         buffer_append(&stdout_buffer, data, data_len);
1588         memset(data, 0, data_len);
1589         xfree(data);
1590 }
1591 static void
1592 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1593 {
1594         u_int data_len;
1595         char *data = packet_get_string(&data_len);
1596         packet_check_eom();
1597         buffer_append(&stderr_buffer, data, data_len);
1598         memset(data, 0, data_len);
1599         xfree(data);
1600 }
1601 static void
1602 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1603 {
1604         exit_status = packet_get_int();
1605         packet_check_eom();
1606         /* Acknowledge the exit. */
1607         packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1608         packet_send();
1609         /*
1610          * Must wait for packet to be sent since we are
1611          * exiting the loop.
1612          */
1613         packet_write_wait();
1614         /* Flag that we want to exit. */
1615         quit_pending = 1;
1616 }
1617 static void
1618 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1619 {
1620         Channel *c = NULL;
1621         int remote_id, sock;
1622
1623         /* Read the remote channel number from the message. */
1624         remote_id = packet_get_int();
1625         packet_check_eom();
1626
1627         /*
1628          * Get a connection to the local authentication agent (this may again
1629          * get forwarded).
1630          */
1631         sock = ssh_get_authentication_socket();
1632
1633         /*
1634          * If we could not connect the agent, send an error message back to
1635          * the server. This should never happen unless the agent dies,
1636          * because authentication forwarding is only enabled if we have an
1637          * agent.
1638          */
1639         if (sock >= 0) {
1640                 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1641                     -1, 0, 0, 0, "authentication agent connection", 1);
1642                 c->remote_id = remote_id;
1643                 c->force_drain = 1;
1644         }
1645         if (c == NULL) {
1646                 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1647                 packet_put_int(remote_id);
1648         } else {
1649                 /* Send a confirmation to the remote host. */
1650                 debug("Forwarding authentication connection.");
1651                 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1652                 packet_put_int(remote_id);
1653                 packet_put_int(c->self);
1654         }
1655         packet_send();
1656 }
1657
1658 static Channel *
1659 client_request_forwarded_tcpip(const char *request_type, int rchan)
1660 {
1661         Channel *c = NULL;
1662         char *listen_address, *originator_address;
1663         u_short listen_port, originator_port;
1664
1665         /* Get rest of the packet */
1666         listen_address = packet_get_string(NULL);
1667         listen_port = packet_get_int();
1668         originator_address = packet_get_string(NULL);
1669         originator_port = packet_get_int();
1670         packet_check_eom();
1671
1672         debug("client_request_forwarded_tcpip: listen %s port %d, "
1673             "originator %s port %d", listen_address, listen_port,
1674             originator_address, originator_port);
1675
1676         c = channel_connect_by_listen_address(listen_port,
1677             "forwarded-tcpip", originator_address);
1678
1679         xfree(originator_address);
1680         xfree(listen_address);
1681         return c;
1682 }
1683
1684 static Channel *
1685 client_request_x11(const char *request_type, int rchan)
1686 {
1687         Channel *c = NULL;
1688         char *originator;
1689         u_short originator_port;
1690         int sock;
1691
1692         if (!options.forward_x11) {
1693                 error("Warning: ssh server tried X11 forwarding.");
1694                 error("Warning: this is probably a break-in attempt by a "
1695                     "malicious server.");
1696                 return NULL;
1697         }
1698         originator = packet_get_string(NULL);
1699         if (datafellows & SSH_BUG_X11FWD) {
1700                 debug2("buggy server: x11 request w/o originator_port");
1701                 originator_port = 0;
1702         } else {
1703                 originator_port = packet_get_int();
1704         }
1705         packet_check_eom();
1706         /* XXX check permission */
1707         debug("client_request_x11: request from %s %d", originator,
1708             originator_port);
1709         xfree(originator);
1710         sock = x11_connect_display();
1711         if (sock < 0)
1712                 return NULL;
1713         c = channel_new("x11",
1714             SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1715             CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1716         c->force_drain = 1;
1717         return c;
1718 }
1719
1720 static Channel *
1721 client_request_agent(const char *request_type, int rchan)
1722 {
1723         Channel *c = NULL;
1724         int sock;
1725
1726         if (!options.forward_agent) {
1727                 error("Warning: ssh server tried agent forwarding.");
1728                 error("Warning: this is probably a break-in attempt by a "
1729                     "malicious server.");
1730                 return NULL;
1731         }
1732         sock = ssh_get_authentication_socket();
1733         if (sock < 0)
1734                 return NULL;
1735         c = channel_new("authentication agent connection",
1736             SSH_CHANNEL_OPEN, sock, sock, -1,
1737             CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1738             "authentication agent connection", 1);
1739         c->force_drain = 1;
1740         return c;
1741 }
1742
1743 int
1744 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1745 {
1746         Channel *c;
1747         int fd;
1748
1749         if (tun_mode == SSH_TUNMODE_NO)
1750                 return 0;
1751
1752         if (!compat20) {
1753                 error("Tunnel forwarding is not supported for protocol 1");
1754                 return -1;
1755         }
1756
1757         debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1758
1759         /* Open local tunnel device */
1760         if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1761                 error("Tunnel device open failed.");
1762                 return -1;
1763         }
1764
1765         c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1766             CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1767         c->datagram = 1;
1768
1769 #if defined(SSH_TUN_FILTER)
1770         if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1771                 channel_register_filter(c->self, sys_tun_infilter,
1772                     sys_tun_outfilter, NULL, NULL);
1773 #endif
1774
1775         packet_start(SSH2_MSG_CHANNEL_OPEN);
1776         packet_put_cstring("tun@openssh.com");
1777         packet_put_int(c->self);
1778         packet_put_int(c->local_window_max);
1779         packet_put_int(c->local_maxpacket);
1780         packet_put_int(tun_mode);
1781         packet_put_int(remote_tun);
1782         packet_send();
1783
1784         return 0;
1785 }
1786
1787 /* XXXX move to generic input handler */
1788 static void
1789 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1790 {
1791         Channel *c = NULL;
1792         char *ctype;
1793         int rchan;
1794         u_int rmaxpack, rwindow, len;
1795
1796         ctype = packet_get_string(&len);
1797         rchan = packet_get_int();
1798         rwindow = packet_get_int();
1799         rmaxpack = packet_get_int();
1800
1801         debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1802             ctype, rchan, rwindow, rmaxpack);
1803
1804         if (strcmp(ctype, "forwarded-tcpip") == 0) {
1805                 c = client_request_forwarded_tcpip(ctype, rchan);
1806         } else if (strcmp(ctype, "x11") == 0) {
1807                 c = client_request_x11(ctype, rchan);
1808         } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1809                 c = client_request_agent(ctype, rchan);
1810         }
1811 /* XXX duplicate : */
1812         if (c != NULL) {
1813                 debug("confirm %s", ctype);
1814                 c->remote_id = rchan;
1815                 c->remote_window = rwindow;
1816                 c->remote_maxpacket = rmaxpack;
1817                 if (c->type != SSH_CHANNEL_CONNECTING) {
1818                         packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1819                         packet_put_int(c->remote_id);
1820                         packet_put_int(c->self);
1821                         packet_put_int(c->local_window);
1822                         packet_put_int(c->local_maxpacket);
1823                         packet_send();
1824                 }
1825         } else {
1826                 debug("failure %s", ctype);
1827                 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1828                 packet_put_int(rchan);
1829                 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1830                 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1831                         packet_put_cstring("open failed");
1832                         packet_put_cstring("");
1833                 }
1834                 packet_send();
1835         }
1836         xfree(ctype);
1837 }
1838 static void
1839 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1840 {
1841         Channel *c = NULL;
1842         int exitval, id, reply, success = 0;
1843         char *rtype;
1844
1845         id = packet_get_int();
1846         rtype = packet_get_string(NULL);
1847         reply = packet_get_char();
1848
1849         debug("client_input_channel_req: channel %d rtype %s reply %d",
1850             id, rtype, reply);
1851
1852         if (id == -1) {
1853                 error("client_input_channel_req: request for channel -1");
1854         } else if ((c = channel_lookup(id)) == NULL) {
1855                 error("client_input_channel_req: channel %d: "
1856                     "unknown channel", id);
1857         } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1858                 packet_check_eom();
1859                 chan_rcvd_eow(c);
1860         } else if (strcmp(rtype, "exit-status") == 0) {
1861                 exitval = packet_get_int();
1862                 if (c->ctl_fd != -1) {
1863                         /* Dispatch to mux client */
1864                         atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1865                         success = 1;
1866                 } else if (id == session_ident) {
1867                         /* Record exit value of local session */
1868                         success = 1;
1869                         exit_status = exitval;
1870                 } else {
1871                         error("client_input_channel_req: unexpected channel %d",
1872                             session_ident);
1873                 }
1874                 packet_check_eom();
1875         }
1876         if (reply) {
1877                 packet_start(success ?
1878                     SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1879                 packet_put_int(c->remote_id);
1880                 packet_send();
1881         }
1882         xfree(rtype);
1883 }
1884 static void
1885 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1886 {
1887         char *rtype;
1888         int want_reply;
1889         int success = 0;
1890
1891         rtype = packet_get_string(NULL);
1892         want_reply = packet_get_char();
1893         debug("client_input_global_request: rtype %s want_reply %d",
1894             rtype, want_reply);
1895         if (want_reply) {
1896                 packet_start(success ?
1897                     SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1898                 packet_send();
1899                 packet_write_wait();
1900         }
1901         xfree(rtype);
1902 }
1903
1904 void
1905 client_session2_setup(int id, int want_tty, int want_subsystem,
1906     const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1907 {
1908         int len;
1909         Channel *c = NULL;
1910
1911         debug2("%s: id %d", __func__, id);
1912
1913         if ((c = channel_lookup(id)) == NULL)
1914                 fatal("client_session2_setup: channel %d: unknown channel", id);
1915
1916         if (want_tty) {
1917                 struct winsize ws;
1918
1919                 /* Store window size in the packet. */
1920                 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1921                         memset(&ws, 0, sizeof(ws));
1922
1923                 channel_request_start(id, "pty-req", 1);
1924                 client_expect_confirm(id, "PTY allocation", 0);
1925                 packet_put_cstring(term != NULL ? term : "");
1926                 packet_put_int((u_int)ws.ws_col);
1927                 packet_put_int((u_int)ws.ws_row);
1928                 packet_put_int((u_int)ws.ws_xpixel);
1929                 packet_put_int((u_int)ws.ws_ypixel);
1930                 if (tiop == NULL)
1931                         tiop = get_saved_tio();
1932                 tty_make_modes(-1, tiop);
1933                 packet_send();
1934                 /* XXX wait for reply */
1935                 c->client_tty = 1;
1936         }
1937
1938         /* Transfer any environment variables from client to server */
1939         if (options.num_send_env != 0 && env != NULL) {
1940                 int i, j, matched;
1941                 char *name, *val;
1942
1943                 debug("Sending environment.");
1944                 for (i = 0; env[i] != NULL; i++) {
1945                         /* Split */
1946                         name = xstrdup(env[i]);
1947                         if ((val = strchr(name, '=')) == NULL) {
1948                                 xfree(name);
1949                                 continue;
1950                         }
1951                         *val++ = '\0';
1952
1953                         matched = 0;
1954                         for (j = 0; j < options.num_send_env; j++) {
1955                                 if (match_pattern(name, options.send_env[j])) {
1956                                         matched = 1;
1957                                         break;
1958                                 }
1959                         }
1960                         if (!matched) {
1961                                 debug3("Ignored env %s", name);
1962                                 xfree(name);
1963                                 continue;
1964                         }
1965
1966                         debug("Sending env %s = %s", name, val);
1967                         channel_request_start(id, "env", 0);
1968                         packet_put_cstring(name);
1969                         packet_put_cstring(val);
1970                         packet_send();
1971                         xfree(name);
1972                 }
1973         }
1974
1975         len = buffer_len(cmd);
1976         if (len > 0) {
1977                 if (len > 900)
1978                         len = 900;
1979                 if (want_subsystem) {
1980                         debug("Sending subsystem: %.*s",
1981                             len, (u_char*)buffer_ptr(cmd));
1982                         channel_request_start(id, "subsystem", 1);
1983                         client_expect_confirm(id, "subsystem", 1);
1984                 } else {
1985                         debug("Sending command: %.*s",
1986                             len, (u_char*)buffer_ptr(cmd));
1987                         channel_request_start(id, "exec", 1);
1988                         client_expect_confirm(id, "exec", 1);
1989                 }
1990                 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1991                 packet_send();
1992         } else {
1993                 channel_request_start(id, "shell", 1);
1994                 client_expect_confirm(id, "shell", 1);
1995                 packet_send();
1996         }
1997 }
1998
1999 static void
2000 client_init_dispatch_20(void)
2001 {
2002         dispatch_init(&dispatch_protocol_error);
2003
2004         dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2005         dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2006         dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2007         dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2008         dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2009         dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2010         dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2011         dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2012         dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2013         dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2014         dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2015         dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2016
2017         /* rekeying */
2018         dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2019
2020         /* global request reply messages */
2021         dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2022         dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2023 }
2024
2025 static void
2026 client_init_dispatch_13(void)
2027 {
2028         dispatch_init(NULL);
2029         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2030         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2031         dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2032         dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2033         dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2034         dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2035         dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2036         dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2037         dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2038
2039         dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2040             &client_input_agent_open : &deny_input_open);
2041         dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2042             &x11_input_open : &deny_input_open);
2043 }
2044
2045 static void
2046 client_init_dispatch_15(void)
2047 {
2048         client_init_dispatch_13();
2049         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2050         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2051 }
2052
2053 static void
2054 client_init_dispatch(void)
2055 {
2056         if (compat20)
2057                 client_init_dispatch_20();
2058         else if (compat13)
2059                 client_init_dispatch_13();
2060         else
2061                 client_init_dispatch_15();
2062 }
2063
2064 /* client specific fatal cleanup */
2065 void
2066 cleanup_exit(int i)
2067 {
2068         leave_raw_mode(force_tty_flag);
2069         leave_non_blocking();
2070         if (options.control_path != NULL && muxserver_sock != -1)
2071                 unlink(options.control_path);
2072         _exit(i);
2073 }