clientloop.c

   1 /* $OpenBSD: clientloop.c,v 1.203 2008/11/01 17:40:33 stevesk 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 /* import options */
 114 extern Options options;
 115
 116 /* Flag indicating that stdin should be redirected from /dev/null. */
 117 extern int stdin_null_flag;
 118
 119 /* Flag indicating that no shell has been requested */
 120 extern int no_shell_flag;
 121
 122 /* Control socket */
 123 extern int muxserver_sock;
 124
 125 /*
 126  * Name of the host we are connecting to.  This is the name given on the
 127  * command line, or the HostName specified for the user-supplied name in a
 128  * configuration file.
 129  */
 130 extern char *host;
 131
 132 /*
 133  * Flag to indicate that we have received a window change signal which has
 134  * not yet been processed.  This will cause a message indicating the new
 135  * window size to be sent to the server a little later.  This is volatile
 136  * because this is updated in a signal handler.
 137  */
 138 static volatile sig_atomic_t received_window_change_signal = 0;
 139 static volatile sig_atomic_t received_signal = 0;
 140
 141 /* Flag indicating whether the user's terminal is in non-blocking mode. */
 142 static int in_non_blocking_mode = 0;
 143
 144 /* Common data for the client loop code. */
 145 static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
 146 static int escape_char1;        /* Escape character. (proto1 only) */
 147 static int escape_pending1;     /* Last character was an escape (proto1 only) */
 148 static int last_was_cr;         /* Last character was a newline. */
 149 static int exit_status;         /* Used to store the command exit status. */
 150 static int stdin_eof;           /* EOF has been encountered on stderr. */
 151 static Buffer stdin_buffer;     /* Buffer for stdin data. */
 152 static Buffer stdout_buffer;    /* Buffer for stdout data. */
 153 static Buffer stderr_buffer;    /* Buffer for stderr data. */
 154 static u_int buffer_high;/* Soft max buffer size. */
 155 static int connection_in;       /* Connection to server (input). */
 156 static int connection_out;      /* Connection to server (output). */
 157 static int need_rekeying;       /* Set to non-zero if rekeying is requested. */
 158 static int session_closed = 0;  /* In SSH2: login session closed. */
 159
 160 static void client_init_dispatch(void);
 161 int     session_ident = -1;
 162
 163 /* Track escape per proto2 channel */
 164 struct escape_filter_ctx {
 165         int escape_pending;
 166         int escape_char;
 167 };
 168
 169 /* Context for channel confirmation replies */
 170 struct channel_reply_ctx {
 171         const char *request_type;
 172         int id, do_close;
 173 };
 174
 175 /* Global request success/failure callbacks */
 176 struct global_confirm {
 177         TAILQ_ENTRY(global_confirm) entry;
 178         global_confirm_cb *cb;
 179         void *ctx;
 180         int ref_count;
 181 };
 182 TAILQ_HEAD(global_confirms, global_confirm);
 183 static struct global_confirms global_confirms =
 184     TAILQ_HEAD_INITIALIZER(global_confirms);
 185
 186 /*XXX*/
 187 extern Kex *xxx_kex;
 188
 189 void ssh_process_session2_setup(int, int, int, Buffer *);
 190
 191 /* Restores stdin to blocking mode. */
 192
 193 static void
 194 leave_non_blocking(void)
 195 {
 196         if (in_non_blocking_mode) {
 197                 unset_nonblock(fileno(stdin));
 198                 in_non_blocking_mode = 0;
 199         }
 200 }
 201
 202 /* Puts stdin terminal in non-blocking mode. */
 203
 204 static void
 205 enter_non_blocking(void)
 206 {
 207         in_non_blocking_mode = 1;
 208         set_nonblock(fileno(stdin));
 209 }
 210
 211 /*
 212  * Signal handler for the window change signal (SIGWINCH).  This just sets a
 213  * flag indicating that the window has changed.
 214  */
 215 /*ARGSUSED */
 216 static void
 217 window_change_handler(int sig)
 218 {
 219         received_window_change_signal = 1;
 220         signal(SIGWINCH, window_change_handler);
 221 }
 222
 223 /*
 224  * Signal handler for signals that cause the program to terminate.  These
 225  * signals must be trapped to restore terminal modes.
 226  */
 227 /*ARGSUSED */
 228 static void
 229 signal_handler(int sig)
 230 {
 231         received_signal = sig;
 232         quit_pending = 1;
 233 }
 234
 235 /*
 236  * Returns current time in seconds from Jan 1, 1970 with the maximum
 237  * available resolution.
 238  */
 239
 240 static double
 241 get_current_time(void)
 242 {
 243         struct timeval tv;
 244         gettimeofday(&tv, NULL);
 245         return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
 246 }
 247
 248 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
 249 void
 250 client_x11_get_proto(const char *display, const char *xauth_path,
 251     u_int trusted, char **_proto, char **_data)
 252 {
 253         char cmd[1024];
 254         char line[512];
 255         char xdisplay[512];
 256         static char proto[512], data[512];
 257         FILE *f;
 258         int got_data = 0, generated = 0, do_unlink = 0, i;
 259         char *xauthdir, *xauthfile;
 260         struct stat st;
 261
 262         xauthdir = xauthfile = NULL;
 263         *_proto = proto;
 264         *_data = data;
 265         proto[0] = data[0] = '\0';
 266
 267         if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
 268                 debug("No xauth program.");
 269         } else {
 270                 if (display == NULL) {
 271                         debug("x11_get_proto: DISPLAY not set");
 272                         return;
 273                 }
 274                 /*
 275                  * Handle FamilyLocal case where $DISPLAY does
 276                  * not match an authorization entry.  For this we
 277                  * just try "xauth list unix:displaynum.screennum".
 278                  * XXX: "localhost" match to determine FamilyLocal
 279                  *      is not perfect.
 280                  */
 281                 if (strncmp(display, "localhost:", 10) == 0) {
 282                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
 283                             display + 10);
 284                         display = xdisplay;
 285                 }
 286                 if (trusted == 0) {
 287                         xauthdir = xmalloc(MAXPATHLEN);
 288                         xauthfile = xmalloc(MAXPATHLEN);
 289                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
 290                         if (mkdtemp(xauthdir) != NULL) {
 291                                 do_unlink = 1;
 292                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
 293                                     xauthdir);
 294                                 snprintf(cmd, sizeof(cmd),
 295                                     "%s -f %s generate %s " SSH_X11_PROTO
 296                                     " untrusted timeout 1200 2>" _PATH_DEVNULL,
 297                                     xauth_path, xauthfile, display);
 298                                 debug2("x11_get_proto: %s", cmd);
 299                                 if (system(cmd) == 0)
 300                                         generated = 1;
 301                         }
 302                 }
 303
 304                 /*
 305                  * When in untrusted mode, we read the cookie only if it was
 306                  * successfully generated as an untrusted one in the step
 307                  * above.
 308                  */
 309                 if (trusted || generated) {
 310                         snprintf(cmd, sizeof(cmd),
 311                             "%s %s%s list %s 2>" _PATH_DEVNULL,
 312                             xauth_path,
 313                             generated ? "-f " : "" ,
 314                             generated ? xauthfile : "",
 315                             display);
 316                         debug2("x11_get_proto: %s", cmd);
 317                         f = popen(cmd, "r");
 318                         if (f && fgets(line, sizeof(line), f) &&
 319                             sscanf(line, "%*s %511s %511s", proto, data) == 2)
 320                                 got_data = 1;
 321                         if (f)
 322                                 pclose(f);
 323                 } else
 324                         error("Warning: untrusted X11 forwarding setup failed: "
 325                             "xauth key data not generated");
 326         }
 327
 328         if (do_unlink) {
 329                 unlink(xauthfile);
 330                 rmdir(xauthdir);
 331         }
 332         if (xauthdir)
 333                 xfree(xauthdir);
 334         if (xauthfile)
 335                 xfree(xauthfile);
 336
 337         /*
 338          * If we didn't get authentication data, just make up some
 339          * data.  The forwarding code will check the validity of the
 340          * response anyway, and substitute this data.  The X11
 341          * server, however, will ignore this fake data and use
 342          * whatever authentication mechanisms it was using otherwise
 343          * for the local connection.
 344          */
 345         if (!got_data) {
 346                 u_int32_t rnd = 0;
 347
 348                 logit("Warning: No xauth data; "
 349                     "using fake authentication data for X11 forwarding.");
 350                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
 351                 for (i = 0; i < 16; i++) {
 352                         if (i % 4 == 0)
 353                                 rnd = arc4random();
 354                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
 355                             rnd & 0xff);
 356                         rnd >>= 8;
 357                 }
 358         }
 359 }
 360
 361 /*
 362  * This is called when the interactive is entered.  This checks if there is
 363  * an EOF coming on stdin.  We must check this explicitly, as select() does
 364  * not appear to wake up when redirecting from /dev/null.
 365  */
 366
 367 static void
 368 client_check_initial_eof_on_stdin(void)
 369 {
 370         int len;
 371         char buf[1];
 372
 373         /*
 374          * If standard input is to be "redirected from /dev/null", we simply
 375          * mark that we have seen an EOF and send an EOF message to the
 376          * server. Otherwise, we try to read a single character; it appears
 377          * that for some files, such /dev/null, select() never wakes up for
 378          * read for this descriptor, which means that we never get EOF.  This
 379          * way we will get the EOF if stdin comes from /dev/null or similar.
 380          */
 381         if (stdin_null_flag) {
 382                 /* Fake EOF on stdin. */
 383                 debug("Sending eof.");
 384                 stdin_eof = 1;
 385                 packet_start(SSH_CMSG_EOF);
 386                 packet_send();
 387         } else {
 388                 enter_non_blocking();
 389
 390                 /* Check for immediate EOF on stdin. */
 391                 len = read(fileno(stdin), buf, 1);
 392                 if (len == 0) {
 393                         /*
 394                          * EOF.  Record that we have seen it and send
 395                          * EOF to server.
 396                          */
 397                         debug("Sending eof.");
 398                         stdin_eof = 1;
 399                         packet_start(SSH_CMSG_EOF);
 400                         packet_send();
 401                 } else if (len > 0) {
 402                         /*
 403                          * Got data.  We must store the data in the buffer,
 404                          * and also process it as an escape character if
 405                          * appropriate.
 406                          */
 407                         if ((u_char) buf[0] == escape_char1)
 408                                 escape_pending1 = 1;
 409                         else
 410                                 buffer_append(&stdin_buffer, buf, 1);
 411                 }
 412                 leave_non_blocking();
 413         }
 414 }
 415
 416
 417 /*
 418  * Make packets from buffered stdin data, and buffer them for sending to the
 419  * connection.
 420  */
 421
 422 static void
 423 client_make_packets_from_stdin_data(void)
 424 {
 425         u_int len;
 426
 427         /* Send buffered stdin data to the server. */
 428         while (buffer_len(&stdin_buffer) > 0 &&
 429             packet_not_very_much_data_to_write()) {
 430                 len = buffer_len(&stdin_buffer);
 431                 /* Keep the packets at reasonable size. */
 432                 if (len > packet_get_maxsize())
 433                         len = packet_get_maxsize();
 434                 packet_start(SSH_CMSG_STDIN_DATA);
 435                 packet_put_string(buffer_ptr(&stdin_buffer), len);
 436                 packet_send();
 437                 buffer_consume(&stdin_buffer, len);
 438                 /* If we have a pending EOF, send it now. */
 439                 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
 440                         packet_start(SSH_CMSG_EOF);
 441                         packet_send();
 442                 }
 443         }
 444 }
 445
 446 /*
 447  * Checks if the client window has changed, and sends a packet about it to
 448  * the server if so.  The actual change is detected elsewhere (by a software
 449  * interrupt on Unix); this just checks the flag and sends a message if
 450  * appropriate.
 451  */
 452
 453 static void
 454 client_check_window_change(void)
 455 {
 456         struct winsize ws;
 457
 458         if (! received_window_change_signal)
 459                 return;
 460         /** XXX race */
 461         received_window_change_signal = 0;
 462
 463         debug2("client_check_window_change: changed");
 464
 465         if (compat20) {
 466                 channel_send_window_changes();
 467         } else {
 468                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
 469                         return;
 470                 packet_start(SSH_CMSG_WINDOW_SIZE);
 471                 packet_put_int((u_int)ws.ws_row);
 472                 packet_put_int((u_int)ws.ws_col);
 473                 packet_put_int((u_int)ws.ws_xpixel);
 474                 packet_put_int((u_int)ws.ws_ypixel);
 475                 packet_send();
 476         }
 477 }
 478
 479 static void
 480 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
 481 {
 482         struct global_confirm *gc;
 483
 484         if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
 485                 return;
 486         if (gc->cb != NULL)
 487                 gc->cb(type, seq, gc->ctx);
 488         if (--gc->ref_count <= 0) {
 489                 TAILQ_REMOVE(&global_confirms, gc, entry);
 490                 bzero(gc, sizeof(*gc));
 491                 xfree(gc);
 492         }
 493
 494         keep_alive_timeouts = 0;
 495 }
 496
 497 static void
 498 server_alive_check(void)
 499 {
 500         if (++keep_alive_timeouts > options.server_alive_count_max) {
 501                 logit("Timeout, server not responding.");
 502                 cleanup_exit(255);
 503         }
 504         packet_start(SSH2_MSG_GLOBAL_REQUEST);
 505         packet_put_cstring("keepalive@openssh.com");
 506         packet_put_char(1);     /* boolean: want reply */
 507         packet_send();
 508         /* Insert an empty placeholder to maintain ordering */
 509         client_register_global_confirm(NULL, NULL);
 510 }
 511
 512 /*
 513  * Waits until the client can do something (some data becomes available on
 514  * one of the file descriptors).
 515  */
 516 static void
 517 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
 518     int *maxfdp, u_int *nallocp, int rekeying)
 519 {
 520         struct timeval tv, *tvp;
 521         int ret;
 522
 523         /* Add any selections by the channel mechanism. */
 524         channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
 525
 526         if (!compat20) {
 527                 /* Read from the connection, unless our buffers are full. */
 528                 if (buffer_len(&stdout_buffer) < buffer_high &&
 529                     buffer_len(&stderr_buffer) < buffer_high &&
 530                     channel_not_very_much_buffered_data())
 531                         FD_SET(connection_in, *readsetp);
 532                 /*
 533                  * Read from stdin, unless we have seen EOF or have very much
 534                  * buffered data to send to the server.
 535                  */
 536                 if (!stdin_eof && packet_not_very_much_data_to_write())
 537                         FD_SET(fileno(stdin), *readsetp);
 538
 539                 /* Select stdout/stderr if have data in buffer. */
 540                 if (buffer_len(&stdout_buffer) > 0)
 541                         FD_SET(fileno(stdout), *writesetp);
 542                 if (buffer_len(&stderr_buffer) > 0)
 543                         FD_SET(fileno(stderr), *writesetp);
 544         } else {
 545                 /* channel_prepare_select could have closed the last channel */
 546                 if (session_closed && !channel_still_open() &&
 547                     !packet_have_data_to_write()) {
 548                         /* clear mask since we did not call select() */
 549                         memset(*readsetp, 0, *nallocp);
 550                         memset(*writesetp, 0, *nallocp);
 551                         return;
 552                 } else {
 553                         FD_SET(connection_in, *readsetp);
 554                 }
 555         }
 556
 557         /* Select server connection if have data to write to the server. */
 558         if (packet_have_data_to_write())
 559                 FD_SET(connection_out, *writesetp);
 560
 561         if (muxserver_sock != -1)
 562                 FD_SET(muxserver_sock, *readsetp);
 563
 564         /*
 565          * Wait for something to happen.  This will suspend the process until
 566          * some selected descriptor can be read, written, or has some other
 567          * event pending.
 568          */
 569
 570         if (options.server_alive_interval == 0 || !compat20)
 571                 tvp = NULL;
 572         else {
 573                 tv.tv_sec = options.server_alive_interval;
 574                 tv.tv_usec = 0;
 575                 tvp = &tv;
 576         }
 577         ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
 578         if (ret < 0) {
 579                 char buf[100];
 580
 581                 /*
 582                  * We have to clear the select masks, because we return.
 583                  * We have to return, because the mainloop checks for the flags
 584                  * set by the signal handlers.
 585                  */
 586                 memset(*readsetp, 0, *nallocp);
 587                 memset(*writesetp, 0, *nallocp);
 588
 589                 if (errno == EINTR)
 590                         return;
 591                 /* Note: we might still have data in the buffers. */
 592                 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
 593                 buffer_append(&stderr_buffer, buf, strlen(buf));
 594                 quit_pending = 1;
 595         } else if (ret == 0)
 596                 server_alive_check();
 597 }
 598
 599 static void
 600 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
 601 {
 602         /* Flush stdout and stderr buffers. */
 603         if (buffer_len(bout) > 0)
 604                 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
 605                     buffer_len(bout));
 606         if (buffer_len(berr) > 0)
 607                 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
 608                     buffer_len(berr));
 609
 610         leave_raw_mode();
 611
 612         /*
 613          * Free (and clear) the buffer to reduce the amount of data that gets
 614          * written to swap.
 615          */
 616         buffer_free(bin);
 617         buffer_free(bout);
 618         buffer_free(berr);
 619
 620         /* Send the suspend signal to the program itself. */
 621         kill(getpid(), SIGTSTP);
 622
 623         /* Reset window sizes in case they have changed */
 624         received_window_change_signal = 1;
 625
 626         /* OK, we have been continued by the user. Reinitialize buffers. */
 627         buffer_init(bin);
 628         buffer_init(bout);
 629         buffer_init(berr);
 630
 631         enter_raw_mode();
 632 }
 633
 634 static void
 635 client_process_net_input(fd_set *readset)
 636 {
 637         int len;
 638         char buf[8192];
 639
 640         /*
 641          * Read input from the server, and add any such data to the buffer of
 642          * the packet subsystem.
 643          */
 644         if (FD_ISSET(connection_in, readset)) {
 645                 /* Read as much as possible. */
 646                 len = read(connection_in, buf, sizeof(buf));
 647                 if (len == 0) {
 648                         /*
 649                          * Received EOF.  The remote host has closed the
 650                          * connection.
 651                          */
 652                         snprintf(buf, sizeof buf,
 653                             "Connection to %.300s closed by remote host.\r\n",
 654                             host);
 655                         buffer_append(&stderr_buffer, buf, strlen(buf));
 656                         quit_pending = 1;
 657                         return;
 658                 }
 659                 /*
 660                  * There is a kernel bug on Solaris that causes select to
 661                  * sometimes wake up even though there is no data available.
 662                  */
 663                 if (len < 0 &&
 664                     (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
 665                         len = 0;
 666
 667                 if (len < 0) {
 668                         /*
 669                          * An error has encountered.  Perhaps there is a
 670                          * network problem.
 671                          */
 672                         snprintf(buf, sizeof buf,
 673                             "Read from remote host %.300s: %.100s\r\n",
 674                             host, strerror(errno));
 675                         buffer_append(&stderr_buffer, buf, strlen(buf));
 676                         quit_pending = 1;
 677                         return;
 678                 }
 679                 packet_process_incoming(buf, len);
 680         }
 681 }
 682
 683 static void
 684 client_status_confirm(int type, Channel *c, void *ctx)
 685 {
 686         struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
 687         char errmsg[256];
 688         int tochan;
 689
 690         /* XXX supress on mux _client_ quietmode */
 691         tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
 692             c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
 693
 694         if (type == SSH2_MSG_CHANNEL_SUCCESS) {
 695                 debug2("%s request accepted on channel %d",
 696                     cr->request_type, c->self);
 697         } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
 698                 if (tochan) {
 699                         snprintf(errmsg, sizeof(errmsg),
 700                             "%s request failed\r\n", cr->request_type);
 701                 } else {
 702                         snprintf(errmsg, sizeof(errmsg),
 703                             "%s request failed on channel %d",
 704                             cr->request_type, c->self);
 705                 }
 706                 /* If error occurred on primary session channel, then exit */
 707                 if (cr->do_close && c->self == session_ident)
 708                         fatal("%s", errmsg);
 709                 /* If error occurred on mux client, append to their stderr */
 710                 if (tochan)
 711                         buffer_append(&c->extended, errmsg, strlen(errmsg));
 712                 else
 713                         error("%s", errmsg);
 714                 if (cr->do_close) {
 715                         chan_read_failed(c);
 716                         chan_write_failed(c);
 717                 }
 718         }
 719         xfree(cr);
 720 }
 721
 722 static void
 723 client_abandon_status_confirm(Channel *c, void *ctx)
 724 {
 725         xfree(ctx);
 726 }
 727
 728 static void
 729 client_expect_confirm(int id, const char *request, int do_close)
 730 {
 731         struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
 732
 733         cr->request_type = request;
 734         cr->do_close = do_close;
 735
 736         channel_register_status_confirm(id, client_status_confirm,
 737             client_abandon_status_confirm, cr);
 738 }
 739
 740 void
 741 client_register_global_confirm(global_confirm_cb *cb, void *ctx)
 742 {
 743         struct global_confirm *gc, *last_gc;
 744
 745         /* Coalesce identical callbacks */
 746         last_gc = TAILQ_LAST(&global_confirms, global_confirms);
 747         if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
 748                 if (++last_gc->ref_count >= INT_MAX)
 749                         fatal("%s: last_gc->ref_count = %d",
 750                             __func__, last_gc->ref_count);
 751                 return;
 752         }
 753
 754         gc = xmalloc(sizeof(*gc));
 755         gc->cb = cb;
 756         gc->ctx = ctx;
 757         gc->ref_count = 1;
 758         TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
 759 }
 760
 761 static void
 762 process_cmdline(void)
 763 {
 764         void (*handler)(int);
 765         char *s, *cmd, *cancel_host;
 766         int delete = 0;
 767         int local = 0;
 768         u_short cancel_port;
 769         Forward fwd;
 770
 771         bzero(&fwd, sizeof(fwd));
 772         fwd.listen_host = fwd.connect_host = NULL;
 773
 774         leave_raw_mode();
 775         handler = signal(SIGINT, SIG_IGN);
 776         cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
 777         if (s == NULL)
 778                 goto out;
 779         while (isspace(*s))
 780                 s++;
 781         if (*s == '-')
 782                 s++;    /* Skip cmdline '-', if any */
 783         if (*s == '\0')
 784                 goto out;
 785
 786         if (*s == 'h' || *s == 'H' || *s == '?') {
 787                 logit("Commands:");
 788                 logit("      -L[bind_address:]port:host:hostport    "
 789                     "Request local forward");
 790                 logit("      -R[bind_address:]port:host:hostport    "
 791                     "Request remote forward");
 792                 logit("      -KR[bind_address:]port                 "
 793                     "Cancel remote forward");
 794                 if (!options.permit_local_command)
 795                         goto out;
 796                 logit("      !args                                  "
 797                     "Execute local command");
 798                 goto out;
 799         }
 800
 801         if (*s == '!' && options.permit_local_command) {
 802                 s++;
 803                 ssh_local_cmd(s);
 804                 goto out;
 805         }
 806
 807         if (*s == 'K') {
 808                 delete = 1;
 809                 s++;
 810         }
 811         if (*s != 'L' && *s != 'R') {
 812                 logit("Invalid command.");
 813                 goto out;
 814         }
 815         if (*s == 'L')
 816                 local = 1;
 817         if (local && delete) {
 818                 logit("Not supported.");
 819                 goto out;
 820         }
 821         if ((!local || delete) && !compat20) {
 822                 logit("Not supported for SSH protocol version 1.");
 823                 goto out;
 824         }
 825
 826         while (isspace(*++s))
 827                 ;
 828
 829         if (delete) {
 830                 cancel_port = 0;
 831                 cancel_host = hpdelim(&s);      /* may be NULL */
 832                 if (s != NULL) {
 833                         cancel_port = a2port(s);
 834                         cancel_host = cleanhostname(cancel_host);
 835                 } else {
 836                         cancel_port = a2port(cancel_host);
 837                         cancel_host = NULL;
 838                 }
 839                 if (cancel_port == 0) {
 840                         logit("Bad forwarding close port");
 841                         goto out;
 842                 }
 843                 channel_request_rforward_cancel(cancel_host, cancel_port);
 844         } else {
 845                 if (!parse_forward(&fwd, s, 0)) {
 846                         logit("Bad forwarding specification.");
 847                         goto out;
 848                 }
 849                 if (local) {
 850                         if (channel_setup_local_fwd_listener(fwd.listen_host,
 851                             fwd.listen_port, fwd.connect_host,
 852                             fwd.connect_port, options.gateway_ports) < 0) {
 853                                 logit("Port forwarding failed.");
 854                                 goto out;
 855                         }
 856                 } else {
 857                         if (channel_request_remote_forwarding(fwd.listen_host,
 858                             fwd.listen_port, fwd.connect_host,
 859                             fwd.connect_port) < 0) {
 860                                 logit("Port forwarding failed.");
 861                                 goto out;
 862                         }
 863                 }
 864
 865                 logit("Forwarding port.");
 866         }
 867
 868 out:
 869         signal(SIGINT, handler);
 870         enter_raw_mode();
 871         if (cmd)
 872                 xfree(cmd);
 873         if (fwd.listen_host != NULL)
 874                 xfree(fwd.listen_host);
 875         if (fwd.connect_host != NULL)
 876                 xfree(fwd.connect_host);
 877 }
 878
 879 /*
 880  * Process the characters one by one, call with c==NULL for proto1 case.
 881  */
 882 static int
 883 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
 884     char *buf, int len)
 885 {
 886         char string[1024];
 887         pid_t pid;
 888         int bytes = 0;
 889         u_int i;
 890         u_char ch;
 891         char *s;
 892         int *escape_pendingp, escape_char;
 893         struct escape_filter_ctx *efc;
 894
 895         if (c == NULL) {
 896                 escape_pendingp = &escape_pending1;
 897                 escape_char = escape_char1;
 898         } else {
 899                 if (c->filter_ctx == NULL)
 900                         return 0;
 901                 efc = (struct escape_filter_ctx *)c->filter_ctx;
 902                 escape_pendingp = &efc->escape_pending;
 903                 escape_char = efc->escape_char;
 904         }
 905
 906         if (len <= 0)
 907                 return (0);
 908
 909         for (i = 0; i < (u_int)len; i++) {
 910                 /* Get one character at a time. */
 911                 ch = buf[i];
 912
 913                 if (*escape_pendingp) {
 914                         /* We have previously seen an escape character. */
 915                         /* Clear the flag now. */
 916                         *escape_pendingp = 0;
 917
 918                         /* Process the escaped character. */
 919                         switch (ch) {
 920                         case '.':
 921                                 /* Terminate the connection. */
 922                                 snprintf(string, sizeof string, "%c.\r\n",
 923                                     escape_char);
 924                                 buffer_append(berr, string, strlen(string));
 925
 926                                 if (c && c->ctl_fd != -1) {
 927                                         chan_read_failed(c);
 928                                         chan_write_failed(c);
 929                                         return 0;
 930                                 } else
 931                                         quit_pending = 1;
 932                                 return -1;
 933
 934                         case 'Z' - 64:
 935                                 /* XXX support this for mux clients */
 936                                 if (c && c->ctl_fd != -1) {
 937  noescape:
 938                                         snprintf(string, sizeof string,
 939                                             "%c%c escape not available to "
 940                                             "multiplexed sessions\r\n",
 941                                             escape_char, ch);
 942                                         buffer_append(berr, string,
 943                                             strlen(string));
 944                                         continue;
 945                                 }
 946                                 /* Suspend the program. Inform the user */
 947                                 snprintf(string, sizeof string,
 948                                     "%c^Z [suspend ssh]\r\n", escape_char);
 949                                 buffer_append(berr, string, strlen(string));
 950
 951                                 /* Restore terminal modes and suspend. */
 952                                 client_suspend_self(bin, bout, berr);
 953
 954                                 /* We have been continued. */
 955                                 continue;
 956
 957                         case 'B':
 958                                 if (compat20) {
 959                                         snprintf(string, sizeof string,
 960                                             "%cB\r\n", escape_char);
 961                                         buffer_append(berr, string,
 962                                             strlen(string));
 963                                         channel_request_start(session_ident,
 964                                             "break", 0);
 965                                         packet_put_int(1000);
 966                                         packet_send();
 967                                 }
 968                                 continue;
 969
 970                         case 'R':
 971                                 if (compat20) {
 972                                         if (datafellows & SSH_BUG_NOREKEY)
 973                                                 logit("Server does not "
 974                                                     "support re-keying");
 975                                         else
 976                                                 need_rekeying = 1;
 977                                 }
 978                                 continue;
 979
 980                         case '&':
 981                                 if (c && c->ctl_fd != -1)
 982                                         goto noescape;
 983                                 /*
 984                                  * Detach the program (continue to serve
 985                                  * connections, but put in background and no
 986                                  * more new connections).
 987                                  */
 988                                 /* Restore tty modes. */
 989                                 leave_raw_mode();
 990
 991                                 /* Stop listening for new connections. */
 992                                 channel_stop_listening();
 993
 994                                 snprintf(string, sizeof string,
 995                                     "%c& [backgrounded]\n", escape_char);
 996                                 buffer_append(berr, string, strlen(string));
 997
 998                                 /* Fork into background. */
 999                                 pid = fork();
1000                                 if (pid < 0) {
1001                                         error("fork: %.100s", strerror(errno));
1002                                         continue;
1003                                 }
1004                                 if (pid != 0) { /* This is the parent. */
1005                                         /* The parent just exits. */
1006                                         exit(0);
1007                                 }
1008                                 /* The child continues serving connections. */
1009                                 if (compat20) {
1010                                         buffer_append(bin, "\004", 1);
1011                                         /* fake EOF on stdin */
1012                                         return -1;
1013                                 } else if (!stdin_eof) {
1014                                         /*
1015                                          * Sending SSH_CMSG_EOF alone does not
1016                                          * always appear to be enough.  So we
1017                                          * try to send an EOF character first.
1018                                          */
1019                                         packet_start(SSH_CMSG_STDIN_DATA);
1020                                         packet_put_string("\004", 1);
1021                                         packet_send();
1022                                         /* Close stdin. */
1023                                         stdin_eof = 1;
1024                                         if (buffer_len(bin) == 0) {
1025                                                 packet_start(SSH_CMSG_EOF);
1026                                                 packet_send();
1027                                         }
1028                                 }
1029                                 continue;
1030
1031                         case '?':
1032                                 if (c && c->ctl_fd != -1) {
1033                                         snprintf(string, sizeof string,
1034 "%c?\r\n\
1035 Supported escape sequences:\r\n\
1036   %c.  - terminate session\r\n\
1037   %cB  - send a BREAK to the remote system\r\n\
1038   %cC  - open a command line\r\n\
1039   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1040   %c#  - list forwarded connections\r\n\
1041   %c?  - this message\r\n\
1042   %c%c  - send the escape character by typing it twice\r\n\
1043 (Note that escapes are only recognized immediately after newline.)\r\n",
1044                                             escape_char, escape_char,
1045                                             escape_char, escape_char,
1046                                             escape_char, escape_char,
1047                                             escape_char, escape_char,
1048                                             escape_char);
1049                                 } else {
1050                                         snprintf(string, sizeof string,
1051 "%c?\r\n\
1052 Supported escape sequences:\r\n\
1053   %c.  - terminate connection (and any multiplexed sessions)\r\n\
1054   %cB  - send a BREAK to the remote system\r\n\
1055   %cC  - open a command line\r\n\
1056   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1057   %c^Z - suspend ssh\r\n\
1058   %c#  - list forwarded connections\r\n\
1059   %c&  - background ssh (when waiting for connections to terminate)\r\n\
1060   %c?  - this message\r\n\
1061   %c%c  - send the escape character by typing it twice\r\n\
1062 (Note that escapes are only recognized immediately after newline.)\r\n",
1063                                             escape_char, escape_char,
1064                                             escape_char, escape_char,
1065                                             escape_char, escape_char,
1066                                             escape_char, escape_char,
1067                                             escape_char, escape_char,
1068                                             escape_char);
1069                                 }
1070                                 buffer_append(berr, string, strlen(string));
1071                                 continue;
1072
1073                         case '#':
1074                                 snprintf(string, sizeof string, "%c#\r\n",
1075                                     escape_char);
1076                                 buffer_append(berr, string, strlen(string));
1077                                 s = channel_open_message();
1078                                 buffer_append(berr, s, strlen(s));
1079                                 xfree(s);
1080                                 continue;
1081
1082                         case 'C':
1083                                 process_cmdline();
1084                                 continue;
1085
1086                         default:
1087                                 if (ch != escape_char) {
1088                                         buffer_put_char(bin, escape_char);
1089                                         bytes++;
1090                                 }
1091                                 /* Escaped characters fall through here */
1092                                 break;
1093                         }
1094                 } else {
1095                         /*
1096                          * The previous character was not an escape char.
1097                          * Check if this is an escape.
1098                          */
1099                         if (last_was_cr && ch == escape_char) {
1100                                 /*
1101                                  * It is. Set the flag and continue to
1102                                  * next character.
1103                                  */
1104                                 *escape_pendingp = 1;
1105                                 continue;
1106                         }
1107                 }
1108
1109                 /*
1110                  * Normal character.  Record whether it was a newline,
1111                  * and append it to the buffer.
1112                  */
1113                 last_was_cr = (ch == '\r' || ch == '\n');
1114                 buffer_put_char(bin, ch);
1115                 bytes++;
1116         }
1117         return bytes;
1118 }
1119
1120 static void
1121 client_process_input(fd_set *readset)
1122 {
1123         int len;
1124         char buf[8192];
1125
1126         /* Read input from stdin. */
1127         if (FD_ISSET(fileno(stdin), readset)) {
1128                 /* Read as much as possible. */
1129                 len = read(fileno(stdin), buf, sizeof(buf));
1130                 if (len < 0 &&
1131                     (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
1132                         return;         /* we'll try again later */
1133                 if (len <= 0) {
1134                         /*
1135                          * Received EOF or error.  They are treated
1136                          * similarly, except that an error message is printed
1137                          * if it was an error condition.
1138                          */
1139                         if (len < 0) {
1140                                 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1141                                     strerror(errno));
1142                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1143                         }
1144                         /* Mark that we have seen EOF. */
1145                         stdin_eof = 1;
1146                         /*
1147                          * Send an EOF message to the server unless there is
1148                          * data in the buffer.  If there is data in the
1149                          * buffer, no message will be sent now.  Code
1150                          * elsewhere will send the EOF when the buffer
1151                          * becomes empty if stdin_eof is set.
1152                          */
1153                         if (buffer_len(&stdin_buffer) == 0) {
1154                                 packet_start(SSH_CMSG_EOF);
1155                                 packet_send();
1156                         }
1157                 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1158                         /*
1159                          * Normal successful read, and no escape character.
1160                          * Just append the data to buffer.
1161                          */
1162                         buffer_append(&stdin_buffer, buf, len);
1163                 } else {
1164                         /*
1165                          * Normal, successful read.  But we have an escape
1166                          * character and have to process the characters one
1167                          * by one.
1168                          */
1169                         if (process_escapes(NULL, &stdin_buffer,
1170                             &stdout_buffer, &stderr_buffer, buf, len) == -1)
1171                                 return;
1172                 }
1173         }
1174 }
1175
1176 static void
1177 client_process_output(fd_set *writeset)
1178 {
1179         int len;
1180         char buf[100];
1181
1182         /* Write buffered output to stdout. */
1183         if (FD_ISSET(fileno(stdout), writeset)) {
1184                 /* Write as much data as possible. */
1185                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1186                     buffer_len(&stdout_buffer));
1187                 if (len <= 0) {
1188                         if (errno == EINTR || errno == EAGAIN ||
1189                             errno == EWOULDBLOCK)
1190                                 len = 0;
1191                         else {
1192                                 /*
1193                                  * An error or EOF was encountered.  Put an
1194                                  * error message to stderr buffer.
1195                                  */
1196                                 snprintf(buf, sizeof buf,
1197                                     "write stdout: %.50s\r\n", strerror(errno));
1198                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1199                                 quit_pending = 1;
1200                                 return;
1201                         }
1202                 }
1203                 /* Consume printed data from the buffer. */
1204                 buffer_consume(&stdout_buffer, len);
1205         }
1206         /* Write buffered output to stderr. */
1207         if (FD_ISSET(fileno(stderr), writeset)) {
1208                 /* Write as much data as possible. */
1209                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1210                     buffer_len(&stderr_buffer));
1211                 if (len <= 0) {
1212                         if (errno == EINTR || errno == EAGAIN ||
1213                             errno == EWOULDBLOCK)
1214                                 len = 0;
1215                         else {
1216                                 /*
1217                                  * EOF or error, but can't even print
1218                                  * error message.
1219                                  */
1220                                 quit_pending = 1;
1221                                 return;
1222                         }
1223                 }
1224                 /* Consume printed characters from the buffer. */
1225                 buffer_consume(&stderr_buffer, len);
1226         }
1227 }
1228
1229 /*
1230  * Get packets from the connection input buffer, and process them as long as
1231  * there are packets available.
1232  *
1233  * Any unknown packets received during the actual
1234  * session cause the session to terminate.  This is
1235  * intended to make debugging easier since no
1236  * confirmations are sent.  Any compatible protocol
1237  * extensions must be negotiated during the
1238  * preparatory phase.
1239  */
1240
1241 static void
1242 client_process_buffered_input_packets(void)
1243 {
1244         dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1245             compat20 ? xxx_kex : NULL);
1246 }
1247
1248 /* scan buf[] for '~' before sending data to the peer */
1249
1250 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1251 void *
1252 client_new_escape_filter_ctx(int escape_char)
1253 {
1254         struct escape_filter_ctx *ret;
1255
1256         ret = xmalloc(sizeof(*ret));
1257         ret->escape_pending = 0;
1258         ret->escape_char = escape_char;
1259         return (void *)ret;
1260 }
1261
1262 /* Free the escape filter context on channel free */
1263 void
1264 client_filter_cleanup(int cid, void *ctx)
1265 {
1266         xfree(ctx);
1267 }
1268
1269 int
1270 client_simple_escape_filter(Channel *c, char *buf, int len)
1271 {
1272         if (c->extended_usage != CHAN_EXTENDED_WRITE)
1273                 return 0;
1274
1275         return process_escapes(c, &c->input, &c->output, &c->extended,
1276             buf, len);
1277 }
1278
1279 static void
1280 client_channel_closed(int id, void *arg)
1281 {
1282         channel_cancel_cleanup(id);
1283         session_closed = 1;
1284         leave_raw_mode();
1285 }
1286
1287 /*
1288  * Implements the interactive session with the server.  This is called after
1289  * the user has been authenticated, and a command has been started on the
1290  * remote host.  If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1291  * used as an escape character for terminating or suspending the session.
1292  */
1293
1294 int
1295 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1296 {
1297         fd_set *readset = NULL, *writeset = NULL;
1298         double start_time, total_time;
1299         int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1300         u_int64_t ibytes, obytes;
1301         u_int nalloc = 0;
1302         char buf[100];
1303
1304         debug("Entering interactive session.");
1305
1306         start_time = get_current_time();
1307
1308         /* Initialize variables. */
1309         escape_pending1 = 0;
1310         last_was_cr = 1;
1311         exit_status = -1;
1312         stdin_eof = 0;
1313         buffer_high = 64 * 1024;
1314         connection_in = packet_get_connection_in();
1315         connection_out = packet_get_connection_out();
1316         max_fd = MAX(connection_in, connection_out);
1317         if (muxserver_sock != -1)
1318                 max_fd = MAX(max_fd, muxserver_sock);
1319
1320         if (!compat20) {
1321                 /* enable nonblocking unless tty */
1322                 if (!isatty(fileno(stdin)))
1323                         set_nonblock(fileno(stdin));
1324                 if (!isatty(fileno(stdout)))
1325                         set_nonblock(fileno(stdout));
1326                 if (!isatty(fileno(stderr)))
1327                         set_nonblock(fileno(stderr));
1328                 max_fd = MAX(max_fd, fileno(stdin));
1329                 max_fd = MAX(max_fd, fileno(stdout));
1330                 max_fd = MAX(max_fd, fileno(stderr));
1331         }
1332         quit_pending = 0;
1333         escape_char1 = escape_char_arg;
1334
1335         /* Initialize buffers. */
1336         buffer_init(&stdin_buffer);
1337         buffer_init(&stdout_buffer);
1338         buffer_init(&stderr_buffer);
1339
1340         client_init_dispatch();
1341
1342         /*
1343          * Set signal handlers, (e.g. to restore non-blocking mode)
1344          * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1345          */
1346         if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1347                 signal(SIGHUP, signal_handler);
1348         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1349                 signal(SIGINT, signal_handler);
1350         if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1351                 signal(SIGQUIT, signal_handler);
1352         if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1353                 signal(SIGTERM, signal_handler);
1354         signal(SIGWINCH, window_change_handler);
1355
1356         if (have_pty)
1357                 enter_raw_mode();
1358
1359         if (compat20) {
1360                 session_ident = ssh2_chan_id;
1361                 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1362                         channel_register_filter(session_ident,
1363                             client_simple_escape_filter, NULL,
1364                             client_filter_cleanup,
1365                             client_new_escape_filter_ctx(escape_char_arg));
1366                 if (session_ident != -1)
1367                         channel_register_cleanup(session_ident,
1368                             client_channel_closed, 0);
1369         } else {
1370                 /* Check if we should immediately send eof on stdin. */
1371                 client_check_initial_eof_on_stdin();
1372         }
1373
1374         /* Main loop of the client for the interactive session mode. */
1375         while (!quit_pending) {
1376
1377                 /* Process buffered packets sent by the server. */
1378                 client_process_buffered_input_packets();
1379
1380                 if (compat20 && session_closed && !channel_still_open())
1381                         break;
1382
1383                 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1384
1385                 if (rekeying) {
1386                         debug("rekeying in progress");
1387                 } else {
1388                         /*
1389                          * Make packets of buffered stdin data, and buffer
1390                          * them for sending to the server.
1391                          */
1392                         if (!compat20)
1393                                 client_make_packets_from_stdin_data();
1394
1395                         /*
1396                          * Make packets from buffered channel data, and
1397                          * enqueue them for sending to the server.
1398                          */
1399                         if (packet_not_very_much_data_to_write())
1400                                 channel_output_poll();
1401
1402                         /*
1403                          * Check if the window size has changed, and buffer a
1404                          * message about it to the server if so.
1405                          */
1406                         client_check_window_change();
1407
1408                         if (quit_pending)
1409                                 break;
1410                 }
1411                 /*
1412                  * Wait until we have something to do (something becomes
1413                  * available on one of the descriptors).
1414                  */
1415                 max_fd2 = max_fd;
1416                 client_wait_until_can_do_something(&readset, &writeset,
1417                     &max_fd2, &nalloc, rekeying);
1418
1419                 if (quit_pending)
1420                         break;
1421
1422                 /* Do channel operations unless rekeying in progress. */
1423                 if (!rekeying) {
1424                         channel_after_select(readset, writeset);
1425                         if (need_rekeying || packet_need_rekeying()) {
1426                                 debug("need rekeying");
1427                                 xxx_kex->done = 0;
1428                                 kex_send_kexinit(xxx_kex);
1429                                 need_rekeying = 0;
1430                         }
1431                 }
1432
1433                 /* Buffer input from the connection.  */
1434                 client_process_net_input(readset);
1435
1436                 /* Accept control connections.  */
1437                 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1438                         if (muxserver_accept_control())
1439                                 quit_pending = 1;
1440                 }
1441
1442                 if (quit_pending)
1443                         break;
1444
1445                 if (!compat20) {
1446                         /* Buffer data from stdin */
1447                         client_process_input(readset);
1448                         /*
1449                          * Process output to stdout and stderr.  Output to
1450                          * the connection is processed elsewhere (above).
1451                          */
1452                         client_process_output(writeset);
1453                 }
1454
1455                 /*
1456                  * Send as much buffered packet data as possible to the
1457                  * sender.
1458                  */
1459                 if (FD_ISSET(connection_out, writeset))
1460                         packet_write_poll();
1461         }
1462         if (readset)
1463                 xfree(readset);
1464         if (writeset)
1465                 xfree(writeset);
1466
1467         /* Terminate the session. */
1468
1469         /* Stop watching for window change. */
1470         signal(SIGWINCH, SIG_DFL);
1471
1472         channel_free_all();
1473
1474         if (have_pty)
1475                 leave_raw_mode();
1476
1477         /* restore blocking io */
1478         if (!isatty(fileno(stdin)))
1479                 unset_nonblock(fileno(stdin));
1480         if (!isatty(fileno(stdout)))
1481                 unset_nonblock(fileno(stdout));
1482         if (!isatty(fileno(stderr)))
1483                 unset_nonblock(fileno(stderr));
1484
1485         /*
1486          * If there was no shell or command requested, there will be no remote
1487          * exit status to be returned.  In that case, clear error code if the
1488          * connection was deliberately terminated at this end.
1489          */
1490         if (no_shell_flag && received_signal == SIGTERM) {
1491                 received_signal = 0;
1492                 exit_status = 0;
1493         }
1494
1495         if (received_signal)
1496                 fatal("Killed by signal %d.", (int) received_signal);
1497
1498         /*
1499          * In interactive mode (with pseudo tty) display a message indicating
1500          * that the connection has been closed.
1501          */
1502         if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1503                 snprintf(buf, sizeof buf,
1504                     "Connection to %.64s closed.\r\n", host);
1505                 buffer_append(&stderr_buffer, buf, strlen(buf));
1506         }
1507
1508         /* Output any buffered data for stdout. */
1509         while (buffer_len(&stdout_buffer) > 0) {
1510                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1511                     buffer_len(&stdout_buffer));
1512                 if (len <= 0) {
1513                         error("Write failed flushing stdout buffer.");
1514                         break;
1515                 }
1516                 buffer_consume(&stdout_buffer, len);
1517         }
1518
1519         /* Output any buffered data for stderr. */
1520         while (buffer_len(&stderr_buffer) > 0) {
1521                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1522                     buffer_len(&stderr_buffer));
1523                 if (len <= 0) {
1524                         error("Write failed flushing stderr buffer.");
1525                         break;
1526                 }
1527                 buffer_consume(&stderr_buffer, len);
1528         }
1529
1530         /* Clear and free any buffers. */
1531         memset(buf, 0, sizeof(buf));
1532         buffer_free(&stdin_buffer);
1533         buffer_free(&stdout_buffer);
1534         buffer_free(&stderr_buffer);
1535
1536         /* Report bytes transferred, and transfer rates. */
1537         total_time = get_current_time() - start_time;
1538         packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1539         packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1540         verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1541             obytes, ibytes, total_time);
1542         if (total_time > 0)
1543                 verbose("Bytes per second: sent %.1f, received %.1f",
1544                     obytes / total_time, ibytes / total_time);
1545         /* Return the exit status of the program. */
1546         debug("Exit status %d", exit_status);
1547         return exit_status;
1548 }
1549
1550 /*********/
1551
1552 static void
1553 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1554 {
1555         u_int data_len;
1556         char *data = packet_get_string(&data_len);
1557         packet_check_eom();
1558         buffer_append(&stdout_buffer, data, data_len);
1559         memset(data, 0, data_len);
1560         xfree(data);
1561 }
1562 static void
1563 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1564 {
1565         u_int data_len;
1566         char *data = packet_get_string(&data_len);
1567         packet_check_eom();
1568         buffer_append(&stderr_buffer, data, data_len);
1569         memset(data, 0, data_len);
1570         xfree(data);
1571 }
1572 static void
1573 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1574 {
1575         exit_status = packet_get_int();
1576         packet_check_eom();
1577         /* Acknowledge the exit. */
1578         packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1579         packet_send();
1580         /*
1581          * Must wait for packet to be sent since we are
1582          * exiting the loop.
1583          */
1584         packet_write_wait();
1585         /* Flag that we want to exit. */
1586         quit_pending = 1;
1587 }
1588 static void
1589 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1590 {
1591         Channel *c = NULL;
1592         int remote_id, sock;
1593
1594         /* Read the remote channel number from the message. */
1595         remote_id = packet_get_int();
1596         packet_check_eom();
1597
1598         /*
1599          * Get a connection to the local authentication agent (this may again
1600          * get forwarded).
1601          */
1602         sock = ssh_get_authentication_socket();
1603
1604         /*
1605          * If we could not connect the agent, send an error message back to
1606          * the server. This should never happen unless the agent dies,
1607          * because authentication forwarding is only enabled if we have an
1608          * agent.
1609          */
1610         if (sock >= 0) {
1611                 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1612                     -1, 0, 0, 0, "authentication agent connection", 1);
1613                 c->remote_id = remote_id;
1614                 c->force_drain = 1;
1615         }
1616         if (c == NULL) {
1617                 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1618                 packet_put_int(remote_id);
1619         } else {
1620                 /* Send a confirmation to the remote host. */
1621                 debug("Forwarding authentication connection.");
1622                 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1623                 packet_put_int(remote_id);
1624                 packet_put_int(c->self);
1625         }
1626         packet_send();
1627 }
1628
1629 static Channel *
1630 client_request_forwarded_tcpip(const char *request_type, int rchan)
1631 {
1632         Channel *c = NULL;
1633         char *listen_address, *originator_address;
1634         int listen_port, originator_port;
1635
1636         /* Get rest of the packet */
1637         listen_address = packet_get_string(NULL);
1638         listen_port = packet_get_int();
1639         originator_address = packet_get_string(NULL);
1640         originator_port = packet_get_int();
1641         packet_check_eom();
1642
1643         debug("client_request_forwarded_tcpip: listen %s port %d, "
1644             "originator %s port %d", listen_address, listen_port,
1645             originator_address, originator_port);
1646
1647         c = channel_connect_by_listen_address(listen_port,
1648             "forwarded-tcpip", originator_address);
1649
1650         xfree(originator_address);
1651         xfree(listen_address);
1652         return c;
1653 }
1654
1655 static Channel *
1656 client_request_x11(const char *request_type, int rchan)
1657 {
1658         Channel *c = NULL;
1659         char *originator;
1660         int originator_port;
1661         int sock;
1662
1663         if (!options.forward_x11) {
1664                 error("Warning: ssh server tried X11 forwarding.");
1665                 error("Warning: this is probably a break-in attempt by a "
1666                     "malicious server.");
1667                 return NULL;
1668         }
1669         originator = packet_get_string(NULL);
1670         if (datafellows & SSH_BUG_X11FWD) {
1671                 debug2("buggy server: x11 request w/o originator_port");
1672                 originator_port = 0;
1673         } else {
1674                 originator_port = packet_get_int();
1675         }
1676         packet_check_eom();
1677         /* XXX check permission */
1678         debug("client_request_x11: request from %s %d", originator,
1679             originator_port);
1680         xfree(originator);
1681         sock = x11_connect_display();
1682         if (sock < 0)
1683                 return NULL;
1684         c = channel_new("x11",
1685             SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1686             CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1687         c->force_drain = 1;
1688         return c;
1689 }
1690
1691 static Channel *
1692 client_request_agent(const char *request_type, int rchan)
1693 {
1694         Channel *c = NULL;
1695         int sock;
1696
1697         if (!options.forward_agent) {
1698                 error("Warning: ssh server tried agent forwarding.");
1699                 error("Warning: this is probably a break-in attempt by a "
1700                     "malicious server.");
1701                 return NULL;
1702         }
1703         sock = ssh_get_authentication_socket();
1704         if (sock < 0)
1705                 return NULL;
1706         c = channel_new("authentication agent connection",
1707             SSH_CHANNEL_OPEN, sock, sock, -1,
1708             CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1709             "authentication agent connection", 1);
1710         c->force_drain = 1;
1711         return c;
1712 }
1713
1714 int
1715 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1716 {
1717         Channel *c;
1718         int fd;
1719
1720         if (tun_mode == SSH_TUNMODE_NO)
1721                 return 0;
1722
1723         if (!compat20) {
1724                 error("Tunnel forwarding is not support for protocol 1");
1725                 return -1;
1726         }
1727
1728         debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1729
1730         /* Open local tunnel device */
1731         if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1732                 error("Tunnel device open failed.");
1733                 return -1;
1734         }
1735
1736         c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1737             CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1738         c->datagram = 1;
1739
1740 #if defined(SSH_TUN_FILTER)
1741         if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1742                 channel_register_filter(c->self, sys_tun_infilter,
1743                     sys_tun_outfilter, NULL, NULL);
1744 #endif
1745
1746         packet_start(SSH2_MSG_CHANNEL_OPEN);
1747         packet_put_cstring("tun@openssh.com");
1748         packet_put_int(c->self);
1749         packet_put_int(c->local_window_max);
1750         packet_put_int(c->local_maxpacket);
1751         packet_put_int(tun_mode);
1752         packet_put_int(remote_tun);
1753         packet_send();
1754
1755         return 0;
1756 }
1757
1758 /* XXXX move to generic input handler */
1759 static void
1760 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1761 {
1762         Channel *c = NULL;
1763         char *ctype;
1764         int rchan;
1765         u_int rmaxpack, rwindow, len;
1766
1767         ctype = packet_get_string(&len);
1768         rchan = packet_get_int();
1769         rwindow = packet_get_int();
1770         rmaxpack = packet_get_int();
1771
1772         debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1773             ctype, rchan, rwindow, rmaxpack);
1774
1775         if (strcmp(ctype, "forwarded-tcpip") == 0) {
1776                 c = client_request_forwarded_tcpip(ctype, rchan);
1777         } else if (strcmp(ctype, "x11") == 0) {
1778                 c = client_request_x11(ctype, rchan);
1779         } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1780                 c = client_request_agent(ctype, rchan);
1781         }
1782 /* XXX duplicate : */
1783         if (c != NULL) {
1784                 debug("confirm %s", ctype);
1785                 c->remote_id = rchan;
1786                 c->remote_window = rwindow;
1787                 c->remote_maxpacket = rmaxpack;
1788                 if (c->type != SSH_CHANNEL_CONNECTING) {
1789                         packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1790                         packet_put_int(c->remote_id);
1791                         packet_put_int(c->self);
1792                         packet_put_int(c->local_window);
1793                         packet_put_int(c->local_maxpacket);
1794                         packet_send();
1795                 }
1796         } else {
1797                 debug("failure %s", ctype);
1798                 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1799                 packet_put_int(rchan);
1800                 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1801                 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1802                         packet_put_cstring("open failed");
1803                         packet_put_cstring("");
1804                 }
1805                 packet_send();
1806         }
1807         xfree(ctype);
1808 }
1809 static void
1810 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1811 {
1812         Channel *c = NULL;
1813         int exitval, id, reply, success = 0;
1814         char *rtype;
1815
1816         id = packet_get_int();
1817         rtype = packet_get_string(NULL);
1818         reply = packet_get_char();
1819
1820         debug("client_input_channel_req: channel %d rtype %s reply %d",
1821             id, rtype, reply);
1822
1823         if (id == -1) {
1824                 error("client_input_channel_req: request for channel -1");
1825         } else if ((c = channel_lookup(id)) == NULL) {
1826                 error("client_input_channel_req: channel %d: "
1827                     "unknown channel", id);
1828         } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1829                 packet_check_eom();
1830                 chan_rcvd_eow(c);
1831         } else if (strcmp(rtype, "exit-status") == 0) {
1832                 exitval = packet_get_int();
1833                 if (id == session_ident) {
1834                         success = 1;
1835                         exit_status = exitval;
1836                 } else if (c->ctl_fd == -1) {
1837                         error("client_input_channel_req: unexpected channel %d",
1838                             session_ident);
1839                 } else {
1840                         atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1841                         success = 1;
1842                 }
1843                 packet_check_eom();
1844         }
1845         if (reply) {
1846                 packet_start(success ?
1847                     SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1848                 packet_put_int(id);
1849                 packet_send();
1850         }
1851         xfree(rtype);
1852 }
1853 static void
1854 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1855 {
1856         char *rtype;
1857         int want_reply;
1858         int success = 0;
1859
1860         rtype = packet_get_string(NULL);
1861         want_reply = packet_get_char();
1862         debug("client_input_global_request: rtype %s want_reply %d",
1863             rtype, want_reply);
1864         if (want_reply) {
1865                 packet_start(success ?
1866                     SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1867                 packet_send();
1868                 packet_write_wait();
1869         }
1870         xfree(rtype);
1871 }
1872
1873 void
1874 client_session2_setup(int id, int want_tty, int want_subsystem,
1875     const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1876 {
1877         int len;
1878         Channel *c = NULL;
1879
1880         debug2("%s: id %d", __func__, id);
1881
1882         if ((c = channel_lookup(id)) == NULL)
1883                 fatal("client_session2_setup: channel %d: unknown channel", id);
1884
1885         if (want_tty) {
1886                 struct winsize ws;
1887
1888                 /* Store window size in the packet. */
1889                 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1890                         memset(&ws, 0, sizeof(ws));
1891
1892                 channel_request_start(id, "pty-req", 1);
1893                 client_expect_confirm(id, "PTY allocation", 0);
1894                 packet_put_cstring(term != NULL ? term : "");
1895                 packet_put_int((u_int)ws.ws_col);
1896                 packet_put_int((u_int)ws.ws_row);
1897                 packet_put_int((u_int)ws.ws_xpixel);
1898                 packet_put_int((u_int)ws.ws_ypixel);
1899                 if (tiop == NULL)
1900                         tiop = get_saved_tio();
1901                 tty_make_modes(-1, tiop);
1902                 packet_send();
1903                 /* XXX wait for reply */
1904                 c->client_tty = 1;
1905         }
1906
1907         /* Transfer any environment variables from client to server */
1908         if (options.num_send_env != 0 && env != NULL) {
1909                 int i, j, matched;
1910                 char *name, *val;
1911
1912                 debug("Sending environment.");
1913                 for (i = 0; env[i] != NULL; i++) {
1914                         /* Split */
1915                         name = xstrdup(env[i]);
1916                         if ((val = strchr(name, '=')) == NULL) {
1917                                 xfree(name);
1918                                 continue;
1919                         }
1920                         *val++ = '\0';
1921
1922                         matched = 0;
1923                         for (j = 0; j < options.num_send_env; j++) {
1924                                 if (match_pattern(name, options.send_env[j])) {
1925                                         matched = 1;
1926                                         break;
1927                                 }
1928                         }
1929                         if (!matched) {
1930                                 debug3("Ignored env %s", name);
1931                                 xfree(name);
1932                                 continue;
1933                         }
1934
1935                         debug("Sending env %s = %s", name, val);
1936                         channel_request_start(id, "env", 0);
1937                         packet_put_cstring(name);
1938                         packet_put_cstring(val);
1939                         packet_send();
1940                         xfree(name);
1941                 }
1942         }
1943
1944         len = buffer_len(cmd);
1945         if (len > 0) {
1946                 if (len > 900)
1947                         len = 900;
1948                 if (want_subsystem) {
1949                         debug("Sending subsystem: %.*s",
1950                             len, (u_char*)buffer_ptr(cmd));
1951                         channel_request_start(id, "subsystem", 1);
1952                         client_expect_confirm(id, "subsystem", 1);
1953                 } else {
1954                         debug("Sending command: %.*s",
1955                             len, (u_char*)buffer_ptr(cmd));
1956                         channel_request_start(id, "exec", 1);
1957                         client_expect_confirm(id, "exec", 1);
1958                 }
1959                 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1960                 packet_send();
1961         } else {
1962                 channel_request_start(id, "shell", 1);
1963                 client_expect_confirm(id, "shell", 1);
1964                 packet_send();
1965         }
1966 }
1967
1968 static void
1969 client_init_dispatch_20(void)
1970 {
1971         dispatch_init(&dispatch_protocol_error);
1972
1973         dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1974         dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1975         dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1976         dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1977         dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1978         dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1979         dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1980         dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1981         dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1982         dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
1983         dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1984         dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1985
1986         /* rekeying */
1987         dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1988
1989         /* global request reply messages */
1990         dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1991         dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1992 }
1993
1994 static void
1995 client_init_dispatch_13(void)
1996 {
1997         dispatch_init(NULL);
1998         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1999         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2000         dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2001         dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2002         dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2003         dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2004         dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2005         dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2006         dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2007
2008         dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2009             &client_input_agent_open : &deny_input_open);
2010         dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2011             &x11_input_open : &deny_input_open);
2012 }
2013
2014 static void
2015 client_init_dispatch_15(void)
2016 {
2017         client_init_dispatch_13();
2018         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2019         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2020 }
2021
2022 static void
2023 client_init_dispatch(void)
2024 {
2025         if (compat20)
2026                 client_init_dispatch_20();
2027         else if (compat13)
2028                 client_init_dispatch_13();
2029         else
2030                 client_init_dispatch_15();
2031 }
2032
2033 /* client specific fatal cleanup */
2034 void
2035 cleanup_exit(int i)
2036 {
2037         leave_raw_mode();
2038         leave_non_blocking();
2039         if (options.control_path != NULL && muxserver_sock != -1)
2040                 unlink(options.control_path);
2041         _exit(i);
2042 }