crypto/openssh/clientloop.c

   1 /* $OpenBSD: clientloop.c,v 1.213 2009/07/05 19:28:33 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 #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 /*
 134  * Flag to indicate that we have received a window change signal which has
 135  * not yet been processed.  This will cause a message indicating the new
 136  * window size to be sent to the server a little later.  This is volatile
 137  * because this is updated in a signal handler.
 138  */
 139 static volatile sig_atomic_t received_window_change_signal = 0;
 140 static volatile sig_atomic_t received_signal = 0;
 141
 142 /* Flag indicating whether the user's terminal is in non-blocking mode. */
 143 static int in_non_blocking_mode = 0;
 144
 145 /* Common data for the client loop code. */
 146 static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
 147 static int escape_char1;        /* Escape character. (proto1 only) */
 148 static int escape_pending1;     /* Last character was an escape (proto1 only) */
 149 static int last_was_cr;         /* Last character was a newline. */
 150 static int exit_status;         /* Used to store the command exit status. */
 151 static int stdin_eof;           /* EOF has been encountered on stderr. */
 152 static Buffer stdin_buffer;     /* Buffer for stdin data. */
 153 static Buffer stdout_buffer;    /* Buffer for stdout data. */
 154 static Buffer stderr_buffer;    /* Buffer for stderr data. */
 155 static u_int buffer_high;/* Soft max buffer size. */
 156 static int connection_in;       /* Connection to server (input). */
 157 static int connection_out;      /* Connection to server (output). */
 158 static int need_rekeying;       /* Set to non-zero if rekeying is requested. */
 159 static int session_closed = 0;  /* In SSH2: login session closed. */
 160
 161 static void client_init_dispatch(void);
 162 int     session_ident = -1;
 163
 164 /* Track escape per proto2 channel */
 165 struct escape_filter_ctx {
 166         int escape_pending;
 167         int escape_char;
 168 };
 169
 170 /* Context for channel confirmation replies */
 171 struct channel_reply_ctx {
 172         const char *request_type;
 173         int id, do_close;
 174 };
 175
 176 /* Global request success/failure callbacks */
 177 struct global_confirm {
 178         TAILQ_ENTRY(global_confirm) entry;
 179         global_confirm_cb *cb;
 180         void *ctx;
 181         int ref_count;
 182 };
 183 TAILQ_HEAD(global_confirms, global_confirm);
 184 static struct global_confirms global_confirms =
 185     TAILQ_HEAD_INITIALIZER(global_confirms);
 186
 187 /*XXX*/
 188 extern Kex *xxx_kex;
 189
 190 void ssh_process_session2_setup(int, int, int, Buffer *);
 191
 192 /* Restores stdin to blocking mode. */
 193
 194 static void
 195 leave_non_blocking(void)
 196 {
 197         if (in_non_blocking_mode) {
 198                 unset_nonblock(fileno(stdin));
 199                 in_non_blocking_mode = 0;
 200         }
 201 }
 202
 203 /* Puts stdin terminal in non-blocking mode. */
 204
 205 static void
 206 enter_non_blocking(void)
 207 {
 208         in_non_blocking_mode = 1;
 209         set_nonblock(fileno(stdin));
 210 }
 211
 212 /*
 213  * Signal handler for the window change signal (SIGWINCH).  This just sets a
 214  * flag indicating that the window has changed.
 215  */
 216 /*ARGSUSED */
 217 static void
 218 window_change_handler(int sig)
 219 {
 220         received_window_change_signal = 1;
 221         signal(SIGWINCH, window_change_handler);
 222 }
 223
 224 /*
 225  * Signal handler for signals that cause the program to terminate.  These
 226  * signals must be trapped to restore terminal modes.
 227  */
 228 /*ARGSUSED */
 229 static void
 230 signal_handler(int sig)
 231 {
 232         received_signal = sig;
 233         quit_pending = 1;
 234 }
 235
 236 /*
 237  * Returns current time in seconds from Jan 1, 1970 with the maximum
 238  * available resolution.
 239  */
 240
 241 static double
 242 get_current_time(void)
 243 {
 244         struct timeval tv;
 245         gettimeofday(&tv, NULL);
 246         return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
 247 }
 248
 249 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
 250 void
 251 client_x11_get_proto(const char *display, const char *xauth_path,
 252     u_int trusted, char **_proto, char **_data)
 253 {
 254         char cmd[1024];
 255         char line[512];
 256         char xdisplay[512];
 257         static char proto[512], data[512];
 258         FILE *f;
 259         int got_data = 0, generated = 0, do_unlink = 0, i;
 260         char *xauthdir, *xauthfile;
 261         struct stat st;
 262
 263         xauthdir = xauthfile = NULL;
 264         *_proto = proto;
 265         *_data = data;
 266         proto[0] = data[0] = '\0';
 267
 268         if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
 269                 debug("No xauth program.");
 270         } else {
 271                 if (display == NULL) {
 272                         debug("x11_get_proto: DISPLAY not set");
 273                         return;
 274                 }
 275                 /*
 276                  * Handle FamilyLocal case where $DISPLAY does
 277                  * not match an authorization entry.  For this we
 278                  * just try "xauth list unix:displaynum.screennum".
 279                  * XXX: "localhost" match to determine FamilyLocal
 280                  *      is not perfect.
 281                  */
 282                 if (strncmp(display, "localhost:", 10) == 0) {
 283                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
 284                             display + 10);
 285                         display = xdisplay;
 286                 }
 287                 if (trusted == 0) {
 288                         xauthdir = xmalloc(MAXPATHLEN);
 289                         xauthfile = xmalloc(MAXPATHLEN);
 290                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
 291                         if (mkdtemp(xauthdir) != NULL) {
 292                                 do_unlink = 1;
 293                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
 294                                     xauthdir);
 295                                 snprintf(cmd, sizeof(cmd),
 296                                     "%s -f %s generate %s " SSH_X11_PROTO
 297                                     " untrusted timeout 1200 2>" _PATH_DEVNULL,
 298                                     xauth_path, xauthfile, display);
 299                                 debug2("x11_get_proto: %s", cmd);
 300                                 if (system(cmd) == 0)
 301                                         generated = 1;
 302                         }
 303                 }
 304
 305                 /*
 306                  * When in untrusted mode, we read the cookie only if it was
 307                  * successfully generated as an untrusted one in the step
 308                  * above.
 309                  */
 310                 if (trusted || generated) {
 311                         snprintf(cmd, sizeof(cmd),
 312                             "%s %s%s list %s 2>" _PATH_DEVNULL,
 313                             xauth_path,
 314                             generated ? "-f " : "" ,
 315                             generated ? xauthfile : "",
 316                             display);
 317                         debug2("x11_get_proto: %s", cmd);
 318                         f = popen(cmd, "r");
 319                         if (f && fgets(line, sizeof(line), f) &&
 320                             sscanf(line, "%*s %511s %511s", proto, data) == 2)
 321                                 got_data = 1;
 322                         if (f)
 323                                 pclose(f);
 324                 } else
 325                         error("Warning: untrusted X11 forwarding setup failed: "
 326                             "xauth key data not generated");
 327         }
 328
 329         if (do_unlink) {
 330                 unlink(xauthfile);
 331                 rmdir(xauthdir);
 332         }
 333         if (xauthdir)
 334                 xfree(xauthdir);
 335         if (xauthfile)
 336                 xfree(xauthfile);
 337
 338         /*
 339          * If we didn't get authentication data, just make up some
 340          * data.  The forwarding code will check the validity of the
 341          * response anyway, and substitute this data.  The X11
 342          * server, however, will ignore this fake data and use
 343          * whatever authentication mechanisms it was using otherwise
 344          * for the local connection.
 345          */
 346         if (!got_data) {
 347                 u_int32_t rnd = 0;
 348
 349                 logit("Warning: No xauth data; "
 350                     "using fake authentication data for X11 forwarding.");
 351                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
 352                 for (i = 0; i < 16; i++) {
 353                         if (i % 4 == 0)
 354                                 rnd = arc4random();
 355                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
 356                             rnd & 0xff);
 357                         rnd >>= 8;
 358                 }
 359         }
 360 }
 361
 362 /*
 363  * This is called when the interactive is entered.  This checks if there is
 364  * an EOF coming on stdin.  We must check this explicitly, as select() does
 365  * not appear to wake up when redirecting from /dev/null.
 366  */
 367
 368 static void
 369 client_check_initial_eof_on_stdin(void)
 370 {
 371         int len;
 372         char buf[1];
 373
 374         /*
 375          * If standard input is to be "redirected from /dev/null", we simply
 376          * mark that we have seen an EOF and send an EOF message to the
 377          * server. Otherwise, we try to read a single character; it appears
 378          * that for some files, such /dev/null, select() never wakes up for
 379          * read for this descriptor, which means that we never get EOF.  This
 380          * way we will get the EOF if stdin comes from /dev/null or similar.
 381          */
 382         if (stdin_null_flag) {
 383                 /* Fake EOF on stdin. */
 384                 debug("Sending eof.");
 385                 stdin_eof = 1;
 386                 packet_start(SSH_CMSG_EOF);
 387                 packet_send();
 388         } else {
 389                 enter_non_blocking();
 390
 391                 /* Check for immediate EOF on stdin. */
 392                 len = read(fileno(stdin), buf, 1);
 393                 if (len == 0) {
 394                         /*
 395                          * EOF.  Record that we have seen it and send
 396                          * EOF to server.
 397                          */
 398                         debug("Sending eof.");
 399                         stdin_eof = 1;
 400                         packet_start(SSH_CMSG_EOF);
 401                         packet_send();
 402                 } else if (len > 0) {
 403                         /*
 404                          * Got data.  We must store the data in the buffer,
 405                          * and also process it as an escape character if
 406                          * appropriate.
 407                          */
 408                         if ((u_char) buf[0] == escape_char1)
 409                                 escape_pending1 = 1;
 410                         else
 411                                 buffer_append(&stdin_buffer, buf, 1);
 412                 }
 413                 leave_non_blocking();
 414         }
 415 }
 416
 417
 418 /*
 419  * Make packets from buffered stdin data, and buffer them for sending to the
 420  * connection.
 421  */
 422
 423 static void
 424 client_make_packets_from_stdin_data(void)
 425 {
 426         u_int len;
 427
 428         /* Send buffered stdin data to the server. */
 429         while (buffer_len(&stdin_buffer) > 0 &&
 430             packet_not_very_much_data_to_write()) {
 431                 len = buffer_len(&stdin_buffer);
 432                 /* Keep the packets at reasonable size. */
 433                 if (len > packet_get_maxsize())
 434                         len = packet_get_maxsize();
 435                 packet_start(SSH_CMSG_STDIN_DATA);
 436                 packet_put_string(buffer_ptr(&stdin_buffer), len);
 437                 packet_send();
 438                 buffer_consume(&stdin_buffer, len);
 439                 /* If we have a pending EOF, send it now. */
 440                 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
 441                         packet_start(SSH_CMSG_EOF);
 442                         packet_send();
 443                 }
 444         }
 445 }
 446
 447 /*
 448  * Checks if the client window has changed, and sends a packet about it to
 449  * the server if so.  The actual change is detected elsewhere (by a software
 450  * interrupt on Unix); this just checks the flag and sends a message if
 451  * appropriate.
 452  */
 453
 454 static void
 455 client_check_window_change(void)
 456 {
 457         struct winsize ws;
 458
 459         if (! received_window_change_signal)
 460                 return;
 461         /** XXX race */
 462         received_window_change_signal = 0;
 463
 464         debug2("client_check_window_change: changed");
 465
 466         if (compat20) {
 467                 channel_send_window_changes();
 468         } else {
 469                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
 470                         return;
 471                 packet_start(SSH_CMSG_WINDOW_SIZE);
 472                 packet_put_int((u_int)ws.ws_row);
 473                 packet_put_int((u_int)ws.ws_col);
 474                 packet_put_int((u_int)ws.ws_xpixel);
 475                 packet_put_int((u_int)ws.ws_ypixel);
 476                 packet_send();
 477         }
 478 }
 479
 480 static void
 481 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
 482 {
 483         struct global_confirm *gc;
 484
 485         if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
 486                 return;
 487         if (gc->cb != NULL)
 488                 gc->cb(type, seq, gc->ctx);
 489         if (--gc->ref_count <= 0) {
 490                 TAILQ_REMOVE(&global_confirms, gc, entry);
 491                 bzero(gc, sizeof(*gc));
 492                 xfree(gc);
 493         }
 494
 495         packet_set_alive_timeouts(0);
 496 }
 497
 498 static void
 499 server_alive_check(void)
 500 {
 501         if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
 502                 logit("Timeout, server not responding.");
 503                 cleanup_exit(255);
 504         }
 505         packet_start(SSH2_MSG_GLOBAL_REQUEST);
 506         packet_put_cstring("keepalive@openssh.com");
 507         packet_put_char(1);     /* boolean: want reply */
 508         packet_send();
 509         /* Insert an empty placeholder to maintain ordering */
 510         client_register_global_confirm(NULL, NULL);
 511 }
 512
 513 /*
 514  * Waits until the client can do something (some data becomes available on
 515  * one of the file descriptors).
 516  */
 517 static void
 518 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
 519     int *maxfdp, u_int *nallocp, int rekeying)
 520 {
 521         struct timeval tv, *tvp;
 522         int ret;
 523
 524         /* Add any selections by the channel mechanism. */
 525         channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
 526
 527         if (!compat20) {
 528                 /* Read from the connection, unless our buffers are full. */
 529                 if (buffer_len(&stdout_buffer) < buffer_high &&
 530                     buffer_len(&stderr_buffer) < buffer_high &&
 531                     channel_not_very_much_buffered_data())
 532                         FD_SET(connection_in, *readsetp);
 533                 /*
 534                  * Read from stdin, unless we have seen EOF or have very much
 535                  * buffered data to send to the server.
 536                  */
 537                 if (!stdin_eof && packet_not_very_much_data_to_write())
 538                         FD_SET(fileno(stdin), *readsetp);
 539
 540                 /* Select stdout/stderr if have data in buffer. */
 541                 if (buffer_len(&stdout_buffer) > 0)
 542                         FD_SET(fileno(stdout), *writesetp);
 543                 if (buffer_len(&stderr_buffer) > 0)
 544                         FD_SET(fileno(stderr), *writesetp);
 545         } else {
 546                 /* channel_prepare_select could have closed the last channel */
 547                 if (session_closed && !channel_still_open() &&
 548                     !packet_have_data_to_write()) {
 549                         /* clear mask since we did not call select() */
 550                         memset(*readsetp, 0, *nallocp);
 551                         memset(*writesetp, 0, *nallocp);
 552                         return;
 553                 } else {
 554                         FD_SET(connection_in, *readsetp);
 555                 }
 556         }
 557
 558         /* Select server connection if have data to write to the server. */
 559         if (packet_have_data_to_write())
 560                 FD_SET(connection_out, *writesetp);
 561
 562         if (muxserver_sock != -1)
 563                 FD_SET(muxserver_sock, *readsetp);
 564
 565         /*
 566          * Wait for something to happen.  This will suspend the process until
 567          * some selected descriptor can be read, written, or has some other
 568          * event pending.
 569          */
 570
 571         if (options.server_alive_interval == 0 || !compat20)
 572                 tvp = NULL;
 573         else {
 574                 tv.tv_sec = options.server_alive_interval;
 575                 tv.tv_usec = 0;
 576                 tvp = &tv;
 577         }
 578         ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
 579         if (ret < 0) {
 580                 char buf[100];
 581
 582                 /*
 583                  * We have to clear the select masks, because we return.
 584                  * We have to return, because the mainloop checks for the flags
 585                  * set by the signal handlers.
 586                  */
 587                 memset(*readsetp, 0, *nallocp);
 588                 memset(*writesetp, 0, *nallocp);
 589
 590                 if (errno == EINTR)
 591                         return;
 592                 /* Note: we might still have data in the buffers. */
 593                 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
 594                 buffer_append(&stderr_buffer, buf, strlen(buf));
 595                 quit_pending = 1;
 596         } else if (ret == 0)
 597                 server_alive_check();
 598 }
 599
 600 static void
 601 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
 602 {
 603         /* Flush stdout and stderr buffers. */
 604         if (buffer_len(bout) > 0)
 605                 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
 606                     buffer_len(bout));
 607         if (buffer_len(berr) > 0)
 608                 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
 609                     buffer_len(berr));
 610
 611         leave_raw_mode();
 612
 613         /*
 614          * Free (and clear) the buffer to reduce the amount of data that gets
 615          * written to swap.
 616          */
 617         buffer_free(bin);
 618         buffer_free(bout);
 619         buffer_free(berr);
 620
 621         /* Send the suspend signal to the program itself. */
 622         kill(getpid(), SIGTSTP);
 623
 624         /* Reset window sizes in case they have changed */
 625         received_window_change_signal = 1;
 626
 627         /* OK, we have been continued by the user. Reinitialize buffers. */
 628         buffer_init(bin);
 629         buffer_init(bout);
 630         buffer_init(berr);
 631
 632         enter_raw_mode();
 633 }
 634
 635 static void
 636 client_process_net_input(fd_set *readset)
 637 {
 638         int len, cont = 0;
 639         char buf[SSH_IOBUFSZ];
 640
 641         /*
 642          * Read input from the server, and add any such data to the buffer of
 643          * the packet subsystem.
 644          */
 645         if (FD_ISSET(connection_in, readset)) {
 646                 /* Read as much as possible. */
 647                 len = roaming_read(connection_in, buf, sizeof(buf), &cont);
 648                 if (len == 0 && cont == 0) {
 649                         /*
 650                          * Received EOF.  The remote host has closed the
 651                          * connection.
 652                          */
 653                         snprintf(buf, sizeof buf,
 654                             "Connection to %.300s closed by remote host.\r\n",
 655                             host);
 656                         buffer_append(&stderr_buffer, buf, strlen(buf));
 657                         quit_pending = 1;
 658                         return;
 659                 }
 660                 /*
 661                  * There is a kernel bug on Solaris that causes select to
 662                  * sometimes wake up even though there is no data available.
 663                  */
 664                 if (len < 0 &&
 665                     (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
 666                         len = 0;
 667
 668                 if (len < 0) {
 669                         /*
 670                          * An error has encountered.  Perhaps there is a
 671                          * network problem.
 672                          */
 673                         snprintf(buf, sizeof buf,
 674                             "Read from remote host %.300s: %.100s\r\n",
 675                             host, strerror(errno));
 676                         buffer_append(&stderr_buffer, buf, strlen(buf));
 677                         quit_pending = 1;
 678                         return;
 679                 }
 680                 packet_process_incoming(buf, len);
 681         }
 682 }
 683
 684 static void
 685 client_status_confirm(int type, Channel *c, void *ctx)
 686 {
 687         struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
 688         char errmsg[256];
 689         int tochan;
 690
 691         /* XXX supress on mux _client_ quietmode */
 692         tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
 693             c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
 694
 695         if (type == SSH2_MSG_CHANNEL_SUCCESS) {
 696                 debug2("%s request accepted on channel %d",
 697                     cr->request_type, c->self);
 698         } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
 699                 if (tochan) {
 700                         snprintf(errmsg, sizeof(errmsg),
 701                             "%s request failed\r\n", cr->request_type);
 702                 } else {
 703                         snprintf(errmsg, sizeof(errmsg),
 704                             "%s request failed on channel %d",
 705                             cr->request_type, c->self);
 706                 }
 707                 /* If error occurred on primary session channel, then exit */
 708                 if (cr->do_close && c->self == session_ident)
 709                         fatal("%s", errmsg);
 710                 /* If error occurred on mux client, append to their stderr */
 711                 if (tochan)
 712                         buffer_append(&c->extended, errmsg, strlen(errmsg));
 713                 else
 714                         error("%s", errmsg);
 715                 if (cr->do_close) {
 716                         chan_read_failed(c);
 717                         chan_write_failed(c);
 718                 }
 719         }
 720         xfree(cr);
 721 }
 722
 723 static void
 724 client_abandon_status_confirm(Channel *c, void *ctx)
 725 {
 726         xfree(ctx);
 727 }
 728
 729 static void
 730 client_expect_confirm(int id, const char *request, int do_close)
 731 {
 732         struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
 733
 734         cr->request_type = request;
 735         cr->do_close = do_close;
 736
 737         channel_register_status_confirm(id, client_status_confirm,
 738             client_abandon_status_confirm, cr);
 739 }
 740
 741 void
 742 client_register_global_confirm(global_confirm_cb *cb, void *ctx)
 743 {
 744         struct global_confirm *gc, *last_gc;
 745
 746         /* Coalesce identical callbacks */
 747         last_gc = TAILQ_LAST(&global_confirms, global_confirms);
 748         if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
 749                 if (++last_gc->ref_count >= INT_MAX)
 750                         fatal("%s: last_gc->ref_count = %d",
 751                             __func__, last_gc->ref_count);
 752                 return;
 753         }
 754
 755         gc = xmalloc(sizeof(*gc));
 756         gc->cb = cb;
 757         gc->ctx = ctx;
 758         gc->ref_count = 1;
 759         TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
 760 }
 761
 762 static void
 763 process_cmdline(void)
 764 {
 765         void (*handler)(int);
 766         char *s, *cmd, *cancel_host;
 767         int delete = 0;
 768         int local = 0, remote = 0, dynamic = 0;
 769         int cancel_port;
 770         Forward fwd;
 771
 772         bzero(&fwd, sizeof(fwd));
 773         fwd.listen_host = fwd.connect_host = NULL;
 774
 775         leave_raw_mode();
 776         handler = signal(SIGINT, SIG_IGN);
 777         cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
 778         if (s == NULL)
 779                 goto out;
 780         while (isspace(*s))
 781                 s++;
 782         if (*s == '-')
 783                 s++;    /* Skip cmdline '-', if any */
 784         if (*s == '\0')
 785                 goto out;
 786
 787         if (*s == 'h' || *s == 'H' || *s == '?') {
 788                 logit("Commands:");
 789                 logit("      -L[bind_address:]port:host:hostport    "
 790                     "Request local forward");
 791                 logit("      -R[bind_address:]port:host:hostport    "
 792                     "Request remote forward");
 793                 logit("      -D[bind_address:]port                  "
 794                     "Request dynamic forward");
 795                 logit("      -KR[bind_address:]port                 "
 796                     "Cancel remote forward");
 797                 if (!options.permit_local_command)
 798                         goto out;
 799                 logit("      !args                                  "
 800                     "Execute local command");
 801                 goto out;
 802         }
 803
 804         if (*s == '!' && options.permit_local_command) {
 805                 s++;
 806                 ssh_local_cmd(s);
 807                 goto out;
 808         }
 809
 810         if (*s == 'K') {
 811                 delete = 1;
 812                 s++;
 813         }
 814         if (*s == 'L')
 815                 local = 1;
 816         else if (*s == 'R')
 817                 remote = 1;
 818         else if (*s == 'D')
 819                 dynamic = 1;
 820         else {
 821                 logit("Invalid command.");
 822                 goto out;
 823         }
 824
 825         if ((local || dynamic) && delete) {
 826                 logit("Not supported.");
 827                 goto out;
 828         }
 829         if (remote && delete && !compat20) {
 830                 logit("Not supported for SSH protocol version 1.");
 831                 goto out;
 832         }
 833
 834         while (isspace(*++s))
 835                 ;
 836
 837         if (delete) {
 838                 cancel_port = 0;
 839                 cancel_host = hpdelim(&s);      /* may be NULL */
 840                 if (s != NULL) {
 841                         cancel_port = a2port(s);
 842                         cancel_host = cleanhostname(cancel_host);
 843                 } else {
 844                         cancel_port = a2port(cancel_host);
 845                         cancel_host = NULL;
 846                 }
 847                 if (cancel_port <= 0) {
 848                         logit("Bad forwarding close port");
 849                         goto out;
 850                 }
 851                 channel_request_rforward_cancel(cancel_host, cancel_port);
 852         } else {
 853                 if (!parse_forward(&fwd, s, dynamic, remote)) {
 854                         logit("Bad forwarding specification.");
 855                         goto out;
 856                 }
 857                 if (local || dynamic) {
 858                         if (channel_setup_local_fwd_listener(fwd.listen_host,
 859                             fwd.listen_port, fwd.connect_host,
 860                             fwd.connect_port, options.gateway_ports) < 0) {
 861                                 logit("Port forwarding failed.");
 862                                 goto out;
 863                         }
 864                 } else {
 865                         if (channel_request_remote_forwarding(fwd.listen_host,
 866                             fwd.listen_port, fwd.connect_host,
 867                             fwd.connect_port) < 0) {
 868                                 logit("Port forwarding failed.");
 869                                 goto out;
 870                         }
 871                 }
 872
 873                 logit("Forwarding port.");
 874         }
 875
 876 out:
 877         signal(SIGINT, handler);
 878         enter_raw_mode();
 879         if (cmd)
 880                 xfree(cmd);
 881         if (fwd.listen_host != NULL)
 882                 xfree(fwd.listen_host);
 883         if (fwd.connect_host != NULL)
 884                 xfree(fwd.connect_host);
 885 }
 886
 887 /*
 888  * Process the characters one by one, call with c==NULL for proto1 case.
 889  */
 890 static int
 891 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
 892     char *buf, int len)
 893 {
 894         char string[1024];
 895         pid_t pid;
 896         int bytes = 0;
 897         u_int i;
 898         u_char ch;
 899         char *s;
 900         int *escape_pendingp, escape_char;
 901         struct escape_filter_ctx *efc;
 902
 903         if (c == NULL) {
 904                 escape_pendingp = &escape_pending1;
 905                 escape_char = escape_char1;
 906         } else {
 907                 if (c->filter_ctx == NULL)
 908                         return 0;
 909                 efc = (struct escape_filter_ctx *)c->filter_ctx;
 910                 escape_pendingp = &efc->escape_pending;
 911                 escape_char = efc->escape_char;
 912         }
 913
 914         if (len <= 0)
 915                 return (0);
 916
 917         for (i = 0; i < (u_int)len; i++) {
 918                 /* Get one character at a time. */
 919                 ch = buf[i];
 920
 921                 if (*escape_pendingp) {
 922                         /* We have previously seen an escape character. */
 923                         /* Clear the flag now. */
 924                         *escape_pendingp = 0;
 925
 926                         /* Process the escaped character. */
 927                         switch (ch) {
 928                         case '.':
 929                                 /* Terminate the connection. */
 930                                 snprintf(string, sizeof string, "%c.\r\n",
 931                                     escape_char);
 932                                 buffer_append(berr, string, strlen(string));
 933
 934                                 if (c && c->ctl_fd != -1) {
 935                                         chan_read_failed(c);
 936                                         chan_write_failed(c);
 937                                         return 0;
 938                                 } else
 939                                         quit_pending = 1;
 940                                 return -1;
 941
 942                         case 'Z' - 64:
 943                                 /* XXX support this for mux clients */
 944                                 if (c && c->ctl_fd != -1) {
 945  noescape:
 946                                         snprintf(string, sizeof string,
 947                                             "%c%c escape not available to "
 948                                             "multiplexed sessions\r\n",
 949                                             escape_char, ch);
 950                                         buffer_append(berr, string,
 951                                             strlen(string));
 952                                         continue;
 953                                 }
 954                                 /* Suspend the program. Inform the user */
 955                                 snprintf(string, sizeof string,
 956                                     "%c^Z [suspend ssh]\r\n", escape_char);
 957                                 buffer_append(berr, string, strlen(string));
 958
 959                                 /* Restore terminal modes and suspend. */
 960                                 client_suspend_self(bin, bout, berr);
 961
 962                                 /* We have been continued. */
 963                                 continue;
 964
 965                         case 'B':
 966                                 if (compat20) {
 967                                         snprintf(string, sizeof string,
 968                                             "%cB\r\n", escape_char);
 969                                         buffer_append(berr, string,
 970                                             strlen(string));
 971                                         channel_request_start(session_ident,
 972                                             "break", 0);
 973                                         packet_put_int(1000);
 974                                         packet_send();
 975                                 }
 976                                 continue;
 977
 978                         case 'R':
 979                                 if (compat20) {
 980                                         if (datafellows & SSH_BUG_NOREKEY)
 981                                                 logit("Server does not "
 982                                                     "support re-keying");
 983                                         else
 984                                                 need_rekeying = 1;
 985                                 }
 986                                 continue;
 987
 988                         case '&':
 989                                 if (c && c->ctl_fd != -1)
 990                                         goto noescape;
 991                                 /*
 992                                  * Detach the program (continue to serve
 993                                  * connections, but put in background and no
 994                                  * more new connections).
 995                                  */
 996                                 /* Restore tty modes. */
 997                                 leave_raw_mode();
 998
 999                                 /* Stop listening for new connections. */
1000                                 channel_stop_listening();
1001
1002                                 snprintf(string, sizeof string,
1003                                     "%c& [backgrounded]\n", escape_char);
1004                                 buffer_append(berr, string, strlen(string));
1005
1006                                 /* Fork into background. */
1007                                 pid = fork();
1008                                 if (pid < 0) {
1009                                         error("fork: %.100s", strerror(errno));
1010                                         continue;
1011                                 }
1012                                 if (pid != 0) { /* This is the parent. */
1013                                         /* The parent just exits. */
1014                                         exit(0);
1015                                 }
1016                                 /* The child continues serving connections. */
1017                                 if (compat20) {
1018                                         buffer_append(bin, "\004", 1);
1019                                         /* fake EOF on stdin */
1020                                         return -1;
1021                                 } else if (!stdin_eof) {
1022                                         /*
1023                                          * Sending SSH_CMSG_EOF alone does not
1024                                          * always appear to be enough.  So we
1025                                          * try to send an EOF character first.
1026                                          */
1027                                         packet_start(SSH_CMSG_STDIN_DATA);
1028                                         packet_put_string("\004", 1);
1029                                         packet_send();
1030                                         /* Close stdin. */
1031                                         stdin_eof = 1;
1032                                         if (buffer_len(bin) == 0) {
1033                                                 packet_start(SSH_CMSG_EOF);
1034                                                 packet_send();
1035                                         }
1036                                 }
1037                                 continue;
1038
1039                         case '?':
1040                                 if (c && c->ctl_fd != -1) {
1041                                         snprintf(string, sizeof string,
1042 "%c?\r\n\
1043 Supported escape sequences:\r\n\
1044   %c.  - terminate session\r\n\
1045   %cB  - send a BREAK to the remote system\r\n\
1046   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1047   %c#  - list forwarded connections\r\n\
1048   %c?  - this message\r\n\
1049   %c%c  - send the escape character by typing it twice\r\n\
1050 (Note that escapes are only recognized immediately after newline.)\r\n",
1051                                             escape_char, escape_char,
1052                                             escape_char, escape_char,
1053                                             escape_char, escape_char,
1054                                             escape_char, escape_char);
1055                                 } else {
1056                                         snprintf(string, sizeof string,
1057 "%c?\r\n\
1058 Supported escape sequences:\r\n\
1059   %c.  - terminate connection (and any multiplexed sessions)\r\n\
1060   %cB  - send a BREAK to the remote system\r\n\
1061   %cC  - open a command line\r\n\
1062   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1063   %c^Z - suspend ssh\r\n\
1064   %c#  - list forwarded connections\r\n\
1065   %c&  - background ssh (when waiting for connections to terminate)\r\n\
1066   %c?  - this message\r\n\
1067   %c%c  - send the escape character by typing it twice\r\n\
1068 (Note that escapes are only recognized immediately after newline.)\r\n",
1069                                             escape_char, escape_char,
1070                                             escape_char, escape_char,
1071                                             escape_char, escape_char,
1072                                             escape_char, escape_char,
1073                                             escape_char, escape_char,
1074                                             escape_char);
1075                                 }
1076                                 buffer_append(berr, string, strlen(string));
1077                                 continue;
1078
1079                         case '#':
1080                                 snprintf(string, sizeof string, "%c#\r\n",
1081                                     escape_char);
1082                                 buffer_append(berr, string, strlen(string));
1083                                 s = channel_open_message();
1084                                 buffer_append(berr, s, strlen(s));
1085                                 xfree(s);
1086                                 continue;
1087
1088                         case 'C':
1089                                 if (c && c->ctl_fd != -1)
1090                                         goto noescape;
1091                                 process_cmdline();
1092                                 continue;
1093
1094                         default:
1095                                 if (ch != escape_char) {
1096                                         buffer_put_char(bin, escape_char);
1097                                         bytes++;
1098                                 }
1099                                 /* Escaped characters fall through here */
1100                                 break;
1101                         }
1102                 } else {
1103                         /*
1104                          * The previous character was not an escape char.
1105                          * Check if this is an escape.
1106                          */
1107                         if (last_was_cr && ch == escape_char) {
1108                                 /*
1109                                  * It is. Set the flag and continue to
1110                                  * next character.
1111                                  */
1112                                 *escape_pendingp = 1;
1113                                 continue;
1114                         }
1115                 }
1116
1117                 /*
1118                  * Normal character.  Record whether it was a newline,
1119                  * and append it to the buffer.
1120                  */
1121                 last_was_cr = (ch == '\r' || ch == '\n');
1122                 buffer_put_char(bin, ch);
1123                 bytes++;
1124         }
1125         return bytes;
1126 }
1127
1128 static void
1129 client_process_input(fd_set *readset)
1130 {
1131         int len;
1132         char buf[SSH_IOBUFSZ];
1133
1134         /* Read input from stdin. */
1135         if (FD_ISSET(fileno(stdin), readset)) {
1136                 /* Read as much as possible. */
1137                 len = read(fileno(stdin), buf, sizeof(buf));
1138                 if (len < 0 &&
1139                     (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
1140                         return;         /* we'll try again later */
1141                 if (len <= 0) {
1142                         /*
1143                          * Received EOF or error.  They are treated
1144                          * similarly, except that an error message is printed
1145                          * if it was an error condition.
1146                          */
1147                         if (len < 0) {
1148                                 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1149                                     strerror(errno));
1150                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1151                         }
1152                         /* Mark that we have seen EOF. */
1153                         stdin_eof = 1;
1154                         /*
1155                          * Send an EOF message to the server unless there is
1156                          * data in the buffer.  If there is data in the
1157                          * buffer, no message will be sent now.  Code
1158                          * elsewhere will send the EOF when the buffer
1159                          * becomes empty if stdin_eof is set.
1160                          */
1161                         if (buffer_len(&stdin_buffer) == 0) {
1162                                 packet_start(SSH_CMSG_EOF);
1163                                 packet_send();
1164                         }
1165                 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1166                         /*
1167                          * Normal successful read, and no escape character.
1168                          * Just append the data to buffer.
1169                          */
1170                         buffer_append(&stdin_buffer, buf, len);
1171                 } else {
1172                         /*
1173                          * Normal, successful read.  But we have an escape
1174                          * character and have to process the characters one
1175                          * by one.
1176                          */
1177                         if (process_escapes(NULL, &stdin_buffer,
1178                             &stdout_buffer, &stderr_buffer, buf, len) == -1)
1179                                 return;
1180                 }
1181         }
1182 }
1183
1184 static void
1185 client_process_output(fd_set *writeset)
1186 {
1187         int len;
1188         char buf[100];
1189
1190         /* Write buffered output to stdout. */
1191         if (FD_ISSET(fileno(stdout), writeset)) {
1192                 /* Write as much data as possible. */
1193                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1194                     buffer_len(&stdout_buffer));
1195                 if (len <= 0) {
1196                         if (errno == EINTR || errno == EAGAIN ||
1197                             errno == EWOULDBLOCK)
1198                                 len = 0;
1199                         else {
1200                                 /*
1201                                  * An error or EOF was encountered.  Put an
1202                                  * error message to stderr buffer.
1203                                  */
1204                                 snprintf(buf, sizeof buf,
1205                                     "write stdout: %.50s\r\n", strerror(errno));
1206                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1207                                 quit_pending = 1;
1208                                 return;
1209                         }
1210                 }
1211                 /* Consume printed data from the buffer. */
1212                 buffer_consume(&stdout_buffer, len);
1213         }
1214         /* Write buffered output to stderr. */
1215         if (FD_ISSET(fileno(stderr), writeset)) {
1216                 /* Write as much data as possible. */
1217                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1218                     buffer_len(&stderr_buffer));
1219                 if (len <= 0) {
1220                         if (errno == EINTR || errno == EAGAIN ||
1221                             errno == EWOULDBLOCK)
1222                                 len = 0;
1223                         else {
1224                                 /*
1225                                  * EOF or error, but can't even print
1226                                  * error message.
1227                                  */
1228                                 quit_pending = 1;
1229                                 return;
1230                         }
1231                 }
1232                 /* Consume printed characters from the buffer. */
1233                 buffer_consume(&stderr_buffer, len);
1234         }
1235 }
1236
1237 /*
1238  * Get packets from the connection input buffer, and process them as long as
1239  * there are packets available.
1240  *
1241  * Any unknown packets received during the actual
1242  * session cause the session to terminate.  This is
1243  * intended to make debugging easier since no
1244  * confirmations are sent.  Any compatible protocol
1245  * extensions must be negotiated during the
1246  * preparatory phase.
1247  */
1248
1249 static void
1250 client_process_buffered_input_packets(void)
1251 {
1252         dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1253             compat20 ? xxx_kex : NULL);
1254 }
1255
1256 /* scan buf[] for '~' before sending data to the peer */
1257
1258 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1259 void *
1260 client_new_escape_filter_ctx(int escape_char)
1261 {
1262         struct escape_filter_ctx *ret;
1263
1264         ret = xmalloc(sizeof(*ret));
1265         ret->escape_pending = 0;
1266         ret->escape_char = escape_char;
1267         return (void *)ret;
1268 }
1269
1270 /* Free the escape filter context on channel free */
1271 void
1272 client_filter_cleanup(int cid, void *ctx)
1273 {
1274         xfree(ctx);
1275 }
1276
1277 int
1278 client_simple_escape_filter(Channel *c, char *buf, int len)
1279 {
1280         if (c->extended_usage != CHAN_EXTENDED_WRITE)
1281                 return 0;
1282
1283         return process_escapes(c, &c->input, &c->output, &c->extended,
1284             buf, len);
1285 }
1286
1287 static void
1288 client_channel_closed(int id, void *arg)
1289 {
1290         channel_cancel_cleanup(id);
1291         session_closed = 1;
1292         leave_raw_mode();
1293 }
1294
1295 /*
1296  * Implements the interactive session with the server.  This is called after
1297  * the user has been authenticated, and a command has been started on the
1298  * remote host.  If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1299  * used as an escape character for terminating or suspending the session.
1300  */
1301
1302 int
1303 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1304 {
1305         fd_set *readset = NULL, *writeset = NULL;
1306         double start_time, total_time;
1307         int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1308         u_int64_t ibytes, obytes;
1309         u_int nalloc = 0;
1310         char buf[100];
1311
1312         debug("Entering interactive session.");
1313
1314         start_time = get_current_time();
1315
1316         /* Initialize variables. */
1317         escape_pending1 = 0;
1318         last_was_cr = 1;
1319         exit_status = -1;
1320         stdin_eof = 0;
1321         buffer_high = 64 * 1024;
1322         connection_in = packet_get_connection_in();
1323         connection_out = packet_get_connection_out();
1324         max_fd = MAX(connection_in, connection_out);
1325         if (muxserver_sock != -1)
1326                 max_fd = MAX(max_fd, muxserver_sock);
1327
1328         if (!compat20) {
1329                 /* enable nonblocking unless tty */
1330                 if (!isatty(fileno(stdin)))
1331                         set_nonblock(fileno(stdin));
1332                 if (!isatty(fileno(stdout)))
1333                         set_nonblock(fileno(stdout));
1334                 if (!isatty(fileno(stderr)))
1335                         set_nonblock(fileno(stderr));
1336                 max_fd = MAX(max_fd, fileno(stdin));
1337                 max_fd = MAX(max_fd, fileno(stdout));
1338                 max_fd = MAX(max_fd, fileno(stderr));
1339         }
1340         quit_pending = 0;
1341         escape_char1 = escape_char_arg;
1342
1343         /* Initialize buffers. */
1344         buffer_init(&stdin_buffer);
1345         buffer_init(&stdout_buffer);
1346         buffer_init(&stderr_buffer);
1347
1348         client_init_dispatch();
1349
1350         /*
1351          * Set signal handlers, (e.g. to restore non-blocking mode)
1352          * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1353          */
1354         if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1355                 signal(SIGHUP, signal_handler);
1356         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1357                 signal(SIGINT, signal_handler);
1358         if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1359                 signal(SIGQUIT, signal_handler);
1360         if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1361                 signal(SIGTERM, signal_handler);
1362         signal(SIGWINCH, window_change_handler);
1363
1364         if (have_pty)
1365                 enter_raw_mode();
1366
1367         if (compat20) {
1368                 session_ident = ssh2_chan_id;
1369                 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1370                         channel_register_filter(session_ident,
1371                             client_simple_escape_filter, NULL,
1372                             client_filter_cleanup,
1373                             client_new_escape_filter_ctx(escape_char_arg));
1374                 if (session_ident != -1)
1375                         channel_register_cleanup(session_ident,
1376                             client_channel_closed, 0);
1377         } else {
1378                 /* Check if we should immediately send eof on stdin. */
1379                 client_check_initial_eof_on_stdin();
1380         }
1381
1382         /* Main loop of the client for the interactive session mode. */
1383         while (!quit_pending) {
1384
1385                 /* Process buffered packets sent by the server. */
1386                 client_process_buffered_input_packets();
1387
1388                 if (compat20 && session_closed && !channel_still_open())
1389                         break;
1390
1391                 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1392
1393                 if (rekeying) {
1394                         debug("rekeying in progress");
1395                 } else {
1396                         /*
1397                          * Make packets of buffered stdin data, and buffer
1398                          * them for sending to the server.
1399                          */
1400                         if (!compat20)
1401                                 client_make_packets_from_stdin_data();
1402
1403                         /*
1404                          * Make packets from buffered channel data, and
1405                          * enqueue them for sending to the server.
1406                          */
1407                         if (packet_not_very_much_data_to_write())
1408                                 channel_output_poll();
1409
1410                         /*
1411                          * Check if the window size has changed, and buffer a
1412                          * message about it to the server if so.
1413                          */
1414                         client_check_window_change();
1415
1416                         if (quit_pending)
1417                                 break;
1418                 }
1419                 /*
1420                  * Wait until we have something to do (something becomes
1421                  * available on one of the descriptors).
1422                  */
1423                 max_fd2 = max_fd;
1424                 client_wait_until_can_do_something(&readset, &writeset,
1425                     &max_fd2, &nalloc, rekeying);
1426
1427                 if (quit_pending)
1428                         break;
1429
1430                 /* Do channel operations unless rekeying in progress. */
1431                 if (!rekeying) {
1432                         channel_after_select(readset, writeset);
1433                         if (need_rekeying || packet_need_rekeying()) {
1434                                 debug("need rekeying");
1435                                 xxx_kex->done = 0;
1436                                 kex_send_kexinit(xxx_kex);
1437                                 need_rekeying = 0;
1438                         }
1439                 }
1440
1441                 /* Buffer input from the connection.  */
1442                 client_process_net_input(readset);
1443
1444                 /* Accept control connections.  */
1445                 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1446                         if (muxserver_accept_control())
1447                                 quit_pending = 1;
1448                 }
1449
1450                 if (quit_pending)
1451                         break;
1452
1453                 if (!compat20) {
1454                         /* Buffer data from stdin */
1455                         client_process_input(readset);
1456                         /*
1457                          * Process output to stdout and stderr.  Output to
1458                          * the connection is processed elsewhere (above).
1459                          */
1460                         client_process_output(writeset);
1461                 }
1462
1463                 /*
1464                  * Send as much buffered packet data as possible to the
1465                  * sender.
1466                  */
1467                 if (FD_ISSET(connection_out, writeset))
1468                         packet_write_poll();
1469         }
1470         if (readset)
1471                 xfree(readset);
1472         if (writeset)
1473                 xfree(writeset);
1474
1475         /* Terminate the session. */
1476
1477         /* Stop watching for window change. */
1478         signal(SIGWINCH, SIG_DFL);
1479
1480         if (compat20) {
1481                 packet_start(SSH2_MSG_DISCONNECT);
1482                 packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1483                 packet_put_cstring("disconnected by user");
1484                 packet_send();
1485                 packet_write_wait();
1486         }
1487
1488         channel_free_all();
1489
1490         if (have_pty)
1491                 leave_raw_mode();
1492
1493         /* restore blocking io */
1494         if (!isatty(fileno(stdin)))
1495                 unset_nonblock(fileno(stdin));
1496         if (!isatty(fileno(stdout)))
1497                 unset_nonblock(fileno(stdout));
1498         if (!isatty(fileno(stderr)))
1499                 unset_nonblock(fileno(stderr));
1500
1501         /*
1502          * If there was no shell or command requested, there will be no remote
1503          * exit status to be returned.  In that case, clear error code if the
1504          * connection was deliberately terminated at this end.
1505          */
1506         if (no_shell_flag && received_signal == SIGTERM) {
1507                 received_signal = 0;
1508                 exit_status = 0;
1509         }
1510
1511         if (received_signal)
1512                 fatal("Killed by signal %d.", (int) received_signal);
1513
1514         /*
1515          * In interactive mode (with pseudo tty) display a message indicating
1516          * that the connection has been closed.
1517          */
1518         if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1519                 snprintf(buf, sizeof buf,
1520                     "Connection to %.64s closed.\r\n", host);
1521                 buffer_append(&stderr_buffer, buf, strlen(buf));
1522         }
1523
1524         /* Output any buffered data for stdout. */
1525         while (buffer_len(&stdout_buffer) > 0) {
1526                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1527                     buffer_len(&stdout_buffer));
1528                 if (len <= 0) {
1529                         error("Write failed flushing stdout buffer.");
1530                         break;
1531                 }
1532                 buffer_consume(&stdout_buffer, len);
1533         }
1534
1535         /* Output any buffered data for stderr. */
1536         while (buffer_len(&stderr_buffer) > 0) {
1537                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1538                     buffer_len(&stderr_buffer));
1539                 if (len <= 0) {
1540                         error("Write failed flushing stderr buffer.");
1541                         break;
1542                 }
1543                 buffer_consume(&stderr_buffer, len);
1544         }
1545
1546         /* Clear and free any buffers. */
1547         memset(buf, 0, sizeof(buf));
1548         buffer_free(&stdin_buffer);
1549         buffer_free(&stdout_buffer);
1550         buffer_free(&stderr_buffer);
1551
1552         /* Report bytes transferred, and transfer rates. */
1553         total_time = get_current_time() - start_time;
1554         packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1555         packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1556         verbose("Transferred: sent %ju, received %ju bytes, in %.1f seconds",
1557             (uintmax_t)obytes, (uintmax_t)ibytes, total_time);
1558         if (total_time > 0)
1559                 verbose("Bytes per second: sent %.1f, received %.1f",
1560                     obytes / total_time, ibytes / total_time);
1561         /* Return the exit status of the program. */
1562         debug("Exit status %d", exit_status);
1563         return exit_status;
1564 }
1565
1566 /*********/
1567
1568 static void
1569 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1570 {
1571         u_int data_len;
1572         char *data = packet_get_string(&data_len);
1573         packet_check_eom();
1574         buffer_append(&stdout_buffer, data, data_len);
1575         memset(data, 0, data_len);
1576         xfree(data);
1577 }
1578 static void
1579 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1580 {
1581         u_int data_len;
1582         char *data = packet_get_string(&data_len);
1583         packet_check_eom();
1584         buffer_append(&stderr_buffer, data, data_len);
1585         memset(data, 0, data_len);
1586         xfree(data);
1587 }
1588 static void
1589 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1590 {
1591         exit_status = packet_get_int();
1592         packet_check_eom();
1593         /* Acknowledge the exit. */
1594         packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1595         packet_send();
1596         /*
1597          * Must wait for packet to be sent since we are
1598          * exiting the loop.
1599          */
1600         packet_write_wait();
1601         /* Flag that we want to exit. */
1602         quit_pending = 1;
1603 }
1604 static void
1605 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1606 {
1607         Channel *c = NULL;
1608         int remote_id, sock;
1609
1610         /* Read the remote channel number from the message. */
1611         remote_id = packet_get_int();
1612         packet_check_eom();
1613
1614         /*
1615          * Get a connection to the local authentication agent (this may again
1616          * get forwarded).
1617          */
1618         sock = ssh_get_authentication_socket();
1619
1620         /*
1621          * If we could not connect the agent, send an error message back to
1622          * the server. This should never happen unless the agent dies,
1623          * because authentication forwarding is only enabled if we have an
1624          * agent.
1625          */
1626         if (sock >= 0) {
1627                 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1628                     -1, 0, 0, 0, "authentication agent connection", 1);
1629                 c->remote_id = remote_id;
1630                 c->force_drain = 1;
1631         }
1632         if (c == NULL) {
1633                 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1634                 packet_put_int(remote_id);
1635         } else {
1636                 /* Send a confirmation to the remote host. */
1637                 debug("Forwarding authentication connection.");
1638                 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1639                 packet_put_int(remote_id);
1640                 packet_put_int(c->self);
1641         }
1642         packet_send();
1643 }
1644
1645 static Channel *
1646 client_request_forwarded_tcpip(const char *request_type, int rchan)
1647 {
1648         Channel *c = NULL;
1649         char *listen_address, *originator_address;
1650         u_short listen_port, originator_port;
1651
1652         /* Get rest of the packet */
1653         listen_address = packet_get_string(NULL);
1654         listen_port = packet_get_int();
1655         originator_address = packet_get_string(NULL);
1656         originator_port = packet_get_int();
1657         packet_check_eom();
1658
1659         debug("client_request_forwarded_tcpip: listen %s port %d, "
1660             "originator %s port %d", listen_address, listen_port,
1661             originator_address, originator_port);
1662
1663         c = channel_connect_by_listen_address(listen_port,
1664             "forwarded-tcpip", originator_address);
1665
1666         xfree(originator_address);
1667         xfree(listen_address);
1668         return c;
1669 }
1670
1671 static Channel *
1672 client_request_x11(const char *request_type, int rchan)
1673 {
1674         Channel *c = NULL;
1675         char *originator;
1676         u_short originator_port;
1677         int sock;
1678
1679         if (!options.forward_x11) {
1680                 error("Warning: ssh server tried X11 forwarding.");
1681                 error("Warning: this is probably a break-in attempt by a "
1682                     "malicious server.");
1683                 return NULL;
1684         }
1685         originator = packet_get_string(NULL);
1686         if (datafellows & SSH_BUG_X11FWD) {
1687                 debug2("buggy server: x11 request w/o originator_port");
1688                 originator_port = 0;
1689         } else {
1690                 originator_port = packet_get_int();
1691         }
1692         packet_check_eom();
1693         /* XXX check permission */
1694         debug("client_request_x11: request from %s %d", originator,
1695             originator_port);
1696         xfree(originator);
1697         sock = x11_connect_display();
1698         if (sock < 0)
1699                 return NULL;
1700         /* again is this really necessary for X11? */
1701         if (options.hpn_disabled)
1702         c = channel_new("x11",
1703             SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1704             CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1705         else
1706                 c = channel_new("x11",
1707                     SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1708                     options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1709         c->force_drain = 1;
1710         return c;
1711 }
1712
1713 static Channel *
1714 client_request_agent(const char *request_type, int rchan)
1715 {
1716         Channel *c = NULL;
1717         int sock;
1718
1719         if (!options.forward_agent) {
1720                 error("Warning: ssh server tried agent forwarding.");
1721                 error("Warning: this is probably a break-in attempt by a "
1722                     "malicious server.");
1723                 return NULL;
1724         }
1725         sock = ssh_get_authentication_socket();
1726         if (sock < 0)
1727                 return NULL;
1728         if (options.hpn_disabled)
1729         c = channel_new("authentication agent connection",
1730             SSH_CHANNEL_OPEN, sock, sock, -1,
1731                     CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1732                     "authentication agent connection", 1);
1733        else
1734         c = channel_new("authentication agent connection",
1735             SSH_CHANNEL_OPEN, sock, sock, -1,
1736                    options.hpn_buffer_size, options.hpn_buffer_size, 0,
1737             "authentication agent connection", 1);
1738         c->force_drain = 1;
1739         return c;
1740 }
1741
1742 int
1743 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1744 {
1745         Channel *c;
1746         int fd;
1747
1748         if (tun_mode == SSH_TUNMODE_NO)
1749                 return 0;
1750
1751         if (!compat20) {
1752                 error("Tunnel forwarding is not supported for protocol 1");
1753                 return -1;
1754         }
1755
1756         debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1757
1758         /* Open local tunnel device */
1759         if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1760                 error("Tunnel device open failed.");
1761                 return -1;
1762         }
1763
1764         if(options.hpn_disabled)
1765         c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1766                                 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1767                                 0, "tun", 1);
1768         else
1769         c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1770                                 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
1771                                 0, "tun", 1);
1772         c->datagram = 1;
1773
1774
1775
1776 #if defined(SSH_TUN_FILTER)
1777         if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1778                 channel_register_filter(c->self, sys_tun_infilter,
1779                     sys_tun_outfilter, NULL, NULL);
1780 #endif
1781
1782         packet_start(SSH2_MSG_CHANNEL_OPEN);
1783         packet_put_cstring("tun@openssh.com");
1784         packet_put_int(c->self);
1785         packet_put_int(c->local_window_max);
1786         packet_put_int(c->local_maxpacket);
1787         packet_put_int(tun_mode);
1788         packet_put_int(remote_tun);
1789         packet_send();
1790
1791         return 0;
1792 }
1793
1794 /* XXXX move to generic input handler */
1795 static void
1796 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1797 {
1798         Channel *c = NULL;
1799         char *ctype;
1800         int rchan;
1801         u_int rmaxpack, rwindow, len;
1802
1803         ctype = packet_get_string(&len);
1804         rchan = packet_get_int();
1805         rwindow = packet_get_int();
1806         rmaxpack = packet_get_int();
1807
1808         debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1809             ctype, rchan, rwindow, rmaxpack);
1810
1811         if (strcmp(ctype, "forwarded-tcpip") == 0) {
1812                 c = client_request_forwarded_tcpip(ctype, rchan);
1813         } else if (strcmp(ctype, "x11") == 0) {
1814                 c = client_request_x11(ctype, rchan);
1815         } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1816                 c = client_request_agent(ctype, rchan);
1817         }
1818 /* XXX duplicate : */
1819         if (c != NULL) {
1820                 debug("confirm %s", ctype);
1821                 c->remote_id = rchan;
1822                 c->remote_window = rwindow;
1823                 c->remote_maxpacket = rmaxpack;
1824                 if (c->type != SSH_CHANNEL_CONNECTING) {
1825                         packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1826                         packet_put_int(c->remote_id);
1827                         packet_put_int(c->self);
1828                         packet_put_int(c->local_window);
1829                         packet_put_int(c->local_maxpacket);
1830                         packet_send();
1831                 }
1832         } else {
1833                 debug("failure %s", ctype);
1834                 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1835                 packet_put_int(rchan);
1836                 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1837                 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1838                         packet_put_cstring("open failed");
1839                         packet_put_cstring("");
1840                 }
1841                 packet_send();
1842         }
1843         xfree(ctype);
1844 }
1845 static void
1846 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1847 {
1848         Channel *c = NULL;
1849         int exitval, id, reply, success = 0;
1850         char *rtype;
1851
1852         id = packet_get_int();
1853         rtype = packet_get_string(NULL);
1854         reply = packet_get_char();
1855
1856         debug("client_input_channel_req: channel %d rtype %s reply %d",
1857             id, rtype, reply);
1858
1859         if (id == -1) {
1860                 error("client_input_channel_req: request for channel -1");
1861         } else if ((c = channel_lookup(id)) == NULL) {
1862                 error("client_input_channel_req: channel %d: "
1863                     "unknown channel", id);
1864         } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1865                 packet_check_eom();
1866                 chan_rcvd_eow(c);
1867         } else if (strcmp(rtype, "exit-status") == 0) {
1868                 exitval = packet_get_int();
1869                 if (id == session_ident) {
1870                         success = 1;
1871                         exit_status = exitval;
1872                 } else if (c->ctl_fd == -1) {
1873                         error("client_input_channel_req: unexpected channel %d",
1874                             session_ident);
1875                 } else {
1876                         atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1877                         success = 1;
1878                 }
1879                 packet_check_eom();
1880         }
1881         if (reply) {
1882                 packet_start(success ?
1883                     SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1884                 packet_put_int(c->remote_id);
1885                 packet_send();
1886         }
1887         xfree(rtype);
1888 }
1889 static void
1890 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1891 {
1892         char *rtype;
1893         int want_reply;
1894         int success = 0;
1895
1896         rtype = packet_get_string(NULL);
1897         want_reply = packet_get_char();
1898         debug("client_input_global_request: rtype %s want_reply %d",
1899             rtype, want_reply);
1900         if (want_reply) {
1901                 packet_start(success ?
1902                     SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1903                 packet_send();
1904                 packet_write_wait();
1905         }
1906         xfree(rtype);
1907 }
1908
1909 void
1910 client_session2_setup(int id, int want_tty, int want_subsystem,
1911     const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1912 {
1913         int len;
1914         Channel *c = NULL;
1915
1916         debug2("%s: id %d", __func__, id);
1917
1918         if ((c = channel_lookup(id)) == NULL)
1919                 fatal("client_session2_setup: channel %d: unknown channel", id);
1920
1921         if (want_tty) {
1922                 struct winsize ws;
1923
1924                 /* Store window size in the packet. */
1925                 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1926                         memset(&ws, 0, sizeof(ws));
1927
1928                 channel_request_start(id, "pty-req", 1);
1929                 client_expect_confirm(id, "PTY allocation", 0);
1930                 packet_put_cstring(term != NULL ? term : "");
1931                 packet_put_int((u_int)ws.ws_col);
1932                 packet_put_int((u_int)ws.ws_row);
1933                 packet_put_int((u_int)ws.ws_xpixel);
1934                 packet_put_int((u_int)ws.ws_ypixel);
1935                 if (tiop == NULL)
1936                         tiop = get_saved_tio();
1937                 tty_make_modes(-1, tiop);
1938                 packet_send();
1939                 /* XXX wait for reply */
1940                 c->client_tty = 1;
1941         }
1942
1943         /* Transfer any environment variables from client to server */
1944         if (options.num_send_env != 0 && env != NULL) {
1945                 int i, j, matched;
1946                 char *name, *val;
1947
1948                 debug("Sending environment.");
1949                 for (i = 0; env[i] != NULL; i++) {
1950                         /* Split */
1951                         name = xstrdup(env[i]);
1952                         if ((val = strchr(name, '=')) == NULL) {
1953                                 xfree(name);
1954                                 continue;
1955                         }
1956                         *val++ = '\0';
1957
1958                         matched = 0;
1959                         for (j = 0; j < options.num_send_env; j++) {
1960                                 if (match_pattern(name, options.send_env[j])) {
1961                                         matched = 1;
1962                                         break;
1963                                 }
1964                         }
1965                         if (!matched) {
1966                                 debug3("Ignored env %s", name);
1967                                 xfree(name);
1968                                 continue;
1969                         }
1970
1971                         debug("Sending env %s = %s", name, val);
1972                         channel_request_start(id, "env", 0);
1973                         packet_put_cstring(name);
1974                         packet_put_cstring(val);
1975                         packet_send();
1976                         xfree(name);
1977                 }
1978         }
1979
1980         len = buffer_len(cmd);
1981         if (len > 0) {
1982                 if (len > 900)
1983                         len = 900;
1984                 if (want_subsystem) {
1985                         debug("Sending subsystem: %.*s",
1986                             len, (u_char*)buffer_ptr(cmd));
1987                         channel_request_start(id, "subsystem", 1);
1988                         client_expect_confirm(id, "subsystem", 1);
1989                 } else {
1990                         debug("Sending command: %.*s",
1991                             len, (u_char*)buffer_ptr(cmd));
1992                         channel_request_start(id, "exec", 1);
1993                         client_expect_confirm(id, "exec", 1);
1994                 }
1995                 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1996                 packet_send();
1997         } else {
1998                 channel_request_start(id, "shell", 1);
1999                 client_expect_confirm(id, "shell", 1);
2000                 packet_send();
2001         }
2002 }
2003
2004 static void
2005 client_init_dispatch_20(void)
2006 {
2007         dispatch_init(&dispatch_protocol_error);
2008
2009         dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2010         dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2011         dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2012         dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2013         dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2014         dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2015         dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2016         dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2017         dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2018         dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2019         dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2020         dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2021
2022         /* rekeying */
2023         dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2024
2025         /* global request reply messages */
2026         dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2027         dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2028 }
2029
2030 static void
2031 client_init_dispatch_13(void)
2032 {
2033         dispatch_init(NULL);
2034         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2035         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2036         dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2037         dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2038         dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2039         dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2040         dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2041         dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2042         dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2043
2044         dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2045             &client_input_agent_open : &deny_input_open);
2046         dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2047             &x11_input_open : &deny_input_open);
2048 }
2049
2050 static void
2051 client_init_dispatch_15(void)
2052 {
2053         client_init_dispatch_13();
2054         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2055         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2056 }
2057
2058 static void
2059 client_init_dispatch(void)
2060 {
2061         if (compat20)
2062                 client_init_dispatch_20();
2063         else if (compat13)
2064                 client_init_dispatch_13();
2065         else
2066                 client_init_dispatch_15();
2067 }
2068
2069 /* client specific fatal cleanup */
2070 void
2071 cleanup_exit(int i)
2072 {
2073         leave_raw_mode();
2074         leave_non_blocking();
2075         if (options.control_path != NULL && muxserver_sock != -1)
2076                 unlink(options.control_path);
2077         _exit(i);
2078 }