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 #ifdef GSSAPI
 115 #include "ssh-gss.h"
 116 #endif
 117
 118 /* import options */
 119 extern Options options;
 120
 121 /* Flag indicating that stdin should be redirected from /dev/null. */
 122 extern int stdin_null_flag;
 123
 124 /* Flag indicating that no shell has been requested */
 125 extern int no_shell_flag;
 126
 127 /* Control socket */
 128 extern int muxserver_sock;
 129
 130 /*
 131  * Name of the host we are connecting to.  This is the name given on the
 132  * command line, or the HostName specified for the user-supplied name in a
 133  * configuration file.
 134  */
 135 extern char *host;
 136
 137 /*
 138  * Flag to indicate that we have received a window change signal which has
 139  * not yet been processed.  This will cause a message indicating the new
 140  * window size to be sent to the server a little later.  This is volatile
 141  * because this is updated in a signal handler.
 142  */
 143 static volatile sig_atomic_t received_window_change_signal = 0;
 144 static volatile sig_atomic_t received_signal = 0;
 145
 146 /* Flag indicating whether the user's terminal is in non-blocking mode. */
 147 static int in_non_blocking_mode = 0;
 148
 149 /* Common data for the client loop code. */
 150 static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
 151 static int escape_char1;        /* Escape character. (proto1 only) */
 152 static int escape_pending1;     /* Last character was an escape (proto1 only) */
 153 static int last_was_cr;         /* Last character was a newline. */
 154 static int exit_status;         /* Used to store the command exit status. */
 155 static int stdin_eof;           /* EOF has been encountered on stderr. */
 156 static Buffer stdin_buffer;     /* Buffer for stdin data. */
 157 static Buffer stdout_buffer;    /* Buffer for stdout data. */
 158 static Buffer stderr_buffer;    /* Buffer for stderr data. */
 159 static u_int buffer_high;/* Soft max buffer size. */
 160 static int connection_in;       /* Connection to server (input). */
 161 static int connection_out;      /* Connection to server (output). */
 162 static int need_rekeying;       /* Set to non-zero if rekeying is requested. */
 163 static int session_closed = 0;  /* In SSH2: login session closed. */
 164
 165 static void client_init_dispatch(void);
 166 int     session_ident = -1;
 167
 168 /* Track escape per proto2 channel */
 169 struct escape_filter_ctx {
 170         int escape_pending;
 171         int escape_char;
 172 };
 173
 174 /* Context for channel confirmation replies */
 175 struct channel_reply_ctx {
 176         const char *request_type;
 177         int id, do_close;
 178 };
 179
 180 /* Global request success/failure callbacks */
 181 struct global_confirm {
 182         TAILQ_ENTRY(global_confirm) entry;
 183         global_confirm_cb *cb;
 184         void *ctx;
 185         int ref_count;
 186 };
 187 TAILQ_HEAD(global_confirms, global_confirm);
 188 static struct global_confirms global_confirms =
 189     TAILQ_HEAD_INITIALIZER(global_confirms);
 190
 191 /*XXX*/
 192 extern Kex *xxx_kex;
 193
 194 void ssh_process_session2_setup(int, int, int, Buffer *);
 195
 196 /* Restores stdin to blocking mode. */
 197
 198 static void
 199 leave_non_blocking(void)
 200 {
 201         if (in_non_blocking_mode) {
 202                 unset_nonblock(fileno(stdin));
 203                 in_non_blocking_mode = 0;
 204         }
 205 }
 206
 207 /* Puts stdin terminal in non-blocking mode. */
 208
 209 static void
 210 enter_non_blocking(void)
 211 {
 212         in_non_blocking_mode = 1;
 213         set_nonblock(fileno(stdin));
 214 }
 215
 216 /*
 217  * Signal handler for the window change signal (SIGWINCH).  This just sets a
 218  * flag indicating that the window has changed.
 219  */
 220 /*ARGSUSED */
 221 static void
 222 window_change_handler(int sig)
 223 {
 224         received_window_change_signal = 1;
 225         signal(SIGWINCH, window_change_handler);
 226 }
 227
 228 /*
 229  * Signal handler for signals that cause the program to terminate.  These
 230  * signals must be trapped to restore terminal modes.
 231  */
 232 /*ARGSUSED */
 233 static void
 234 signal_handler(int sig)
 235 {
 236         received_signal = sig;
 237         quit_pending = 1;
 238 }
 239
 240 /*
 241  * Returns current time in seconds from Jan 1, 1970 with the maximum
 242  * available resolution.
 243  */
 244
 245 static double
 246 get_current_time(void)
 247 {
 248         struct timeval tv;
 249         gettimeofday(&tv, NULL);
 250         return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
 251 }
 252
 253 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
 254 void
 255 client_x11_get_proto(const char *display, const char *xauth_path,
 256     u_int trusted, char **_proto, char **_data)
 257 {
 258         char cmd[1024];
 259         char line[512];
 260         char xdisplay[512];
 261         static char proto[512], data[512];
 262         FILE *f;
 263         int got_data = 0, generated = 0, do_unlink = 0, i;
 264         char *xauthdir, *xauthfile;
 265         struct stat st;
 266
 267         xauthdir = xauthfile = NULL;
 268         *_proto = proto;
 269         *_data = data;
 270         proto[0] = data[0] = '\0';
 271
 272         if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
 273                 debug("No xauth program.");
 274         } else {
 275                 if (display == NULL) {
 276                         debug("x11_get_proto: DISPLAY not set");
 277                         return;
 278                 }
 279                 /*
 280                  * Handle FamilyLocal case where $DISPLAY does
 281                  * not match an authorization entry.  For this we
 282                  * just try "xauth list unix:displaynum.screennum".
 283                  * XXX: "localhost" match to determine FamilyLocal
 284                  *      is not perfect.
 285                  */
 286                 if (strncmp(display, "localhost:", 10) == 0) {
 287                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
 288                             display + 10);
 289                         display = xdisplay;
 290                 }
 291                 if (trusted == 0) {
 292                         xauthdir = xmalloc(MAXPATHLEN);
 293                         xauthfile = xmalloc(MAXPATHLEN);
 294                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
 295                         if (mkdtemp(xauthdir) != NULL) {
 296                                 do_unlink = 1;
 297                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
 298                                     xauthdir);
 299                                 snprintf(cmd, sizeof(cmd),
 300                                     "%s -f %s generate %s " SSH_X11_PROTO
 301                                     " untrusted timeout 1200 2>" _PATH_DEVNULL,
 302                                     xauth_path, xauthfile, display);
 303                                 debug2("x11_get_proto: %s", cmd);
 304                                 if (system(cmd) == 0)
 305                                         generated = 1;
 306                         }
 307                 }
 308
 309                 /*
 310                  * When in untrusted mode, we read the cookie only if it was
 311                  * successfully generated as an untrusted one in the step
 312                  * above.
 313                  */
 314                 if (trusted || generated) {
 315                         snprintf(cmd, sizeof(cmd),
 316                             "%s %s%s list %s 2>" _PATH_DEVNULL,
 317                             xauth_path,
 318                             generated ? "-f " : "" ,
 319                             generated ? xauthfile : "",
 320                             display);
 321                         debug2("x11_get_proto: %s", cmd);
 322                         f = popen(cmd, "r");
 323                         if (f && fgets(line, sizeof(line), f) &&
 324                             sscanf(line, "%*s %511s %511s", proto, data) == 2)
 325                                 got_data = 1;
 326                         if (f)
 327                                 pclose(f);
 328                 } else
 329                         error("Warning: untrusted X11 forwarding setup failed: "
 330                             "xauth key data not generated");
 331         }
 332
 333         if (do_unlink) {
 334                 unlink(xauthfile);
 335                 rmdir(xauthdir);
 336         }
 337         if (xauthdir)
 338                 xfree(xauthdir);
 339         if (xauthfile)
 340                 xfree(xauthfile);
 341
 342         /*
 343          * If we didn't get authentication data, just make up some
 344          * data.  The forwarding code will check the validity of the
 345          * response anyway, and substitute this data.  The X11
 346          * server, however, will ignore this fake data and use
 347          * whatever authentication mechanisms it was using otherwise
 348          * for the local connection.
 349          */
 350         if (!got_data) {
 351                 u_int32_t rnd = 0;
 352
 353                 logit("Warning: No xauth data; "
 354                     "using fake authentication data for X11 forwarding.");
 355                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
 356                 for (i = 0; i < 16; i++) {
 357                         if (i % 4 == 0)
 358                                 rnd = arc4random();
 359                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
 360                             rnd & 0xff);
 361                         rnd >>= 8;
 362                 }
 363         }
 364 }
 365
 366 /*
 367  * This is called when the interactive is entered.  This checks if there is
 368  * an EOF coming on stdin.  We must check this explicitly, as select() does
 369  * not appear to wake up when redirecting from /dev/null.
 370  */
 371
 372 static void
 373 client_check_initial_eof_on_stdin(void)
 374 {
 375         int len;
 376         char buf[1];
 377
 378         /*
 379          * If standard input is to be "redirected from /dev/null", we simply
 380          * mark that we have seen an EOF and send an EOF message to the
 381          * server. Otherwise, we try to read a single character; it appears
 382          * that for some files, such /dev/null, select() never wakes up for
 383          * read for this descriptor, which means that we never get EOF.  This
 384          * way we will get the EOF if stdin comes from /dev/null or similar.
 385          */
 386         if (stdin_null_flag) {
 387                 /* Fake EOF on stdin. */
 388                 debug("Sending eof.");
 389                 stdin_eof = 1;
 390                 packet_start(SSH_CMSG_EOF);
 391                 packet_send();
 392         } else {
 393                 enter_non_blocking();
 394
 395                 /* Check for immediate EOF on stdin. */
 396                 len = read(fileno(stdin), buf, 1);
 397                 if (len == 0) {
 398                         /*
 399                          * EOF.  Record that we have seen it and send
 400                          * EOF to server.
 401                          */
 402                         debug("Sending eof.");
 403                         stdin_eof = 1;
 404                         packet_start(SSH_CMSG_EOF);
 405                         packet_send();
 406                 } else if (len > 0) {
 407                         /*
 408                          * Got data.  We must store the data in the buffer,
 409                          * and also process it as an escape character if
 410                          * appropriate.
 411                          */
 412                         if ((u_char) buf[0] == escape_char1)
 413                                 escape_pending1 = 1;
 414                         else
 415                                 buffer_append(&stdin_buffer, buf, 1);
 416                 }
 417                 leave_non_blocking();
 418         }
 419 }
 420
 421
 422 /*
 423  * Make packets from buffered stdin data, and buffer them for sending to the
 424  * connection.
 425  */
 426
 427 static void
 428 client_make_packets_from_stdin_data(void)
 429 {
 430         u_int len;
 431
 432         /* Send buffered stdin data to the server. */
 433         while (buffer_len(&stdin_buffer) > 0 &&
 434             packet_not_very_much_data_to_write()) {
 435                 len = buffer_len(&stdin_buffer);
 436                 /* Keep the packets at reasonable size. */
 437                 if (len > packet_get_maxsize())
 438                         len = packet_get_maxsize();
 439                 packet_start(SSH_CMSG_STDIN_DATA);
 440                 packet_put_string(buffer_ptr(&stdin_buffer), len);
 441                 packet_send();
 442                 buffer_consume(&stdin_buffer, len);
 443                 /* If we have a pending EOF, send it now. */
 444                 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
 445                         packet_start(SSH_CMSG_EOF);
 446                         packet_send();
 447                 }
 448         }
 449 }
 450
 451 /*
 452  * Checks if the client window has changed, and sends a packet about it to
 453  * the server if so.  The actual change is detected elsewhere (by a software
 454  * interrupt on Unix); this just checks the flag and sends a message if
 455  * appropriate.
 456  */
 457
 458 static void
 459 client_check_window_change(void)
 460 {
 461         struct winsize ws;
 462
 463         if (! received_window_change_signal)
 464                 return;
 465         /** XXX race */
 466         received_window_change_signal = 0;
 467
 468         debug2("client_check_window_change: changed");
 469
 470         if (compat20) {
 471                 channel_send_window_changes();
 472         } else {
 473                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
 474                         return;
 475                 packet_start(SSH_CMSG_WINDOW_SIZE);
 476                 packet_put_int((u_int)ws.ws_row);
 477                 packet_put_int((u_int)ws.ws_col);
 478                 packet_put_int((u_int)ws.ws_xpixel);
 479                 packet_put_int((u_int)ws.ws_ypixel);
 480                 packet_send();
 481         }
 482 }
 483
 484 static void
 485 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
 486 {
 487         struct global_confirm *gc;
 488
 489         if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
 490                 return;
 491         if (gc->cb != NULL)
 492                 gc->cb(type, seq, gc->ctx);
 493         if (--gc->ref_count <= 0) {
 494                 TAILQ_REMOVE(&global_confirms, gc, entry);
 495                 bzero(gc, sizeof(*gc));
 496                 xfree(gc);
 497         }
 498
 499         packet_set_alive_timeouts(0);
 500 }
 501
 502 static void
 503 server_alive_check(void)
 504 {
 505         if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
 506                 logit("Timeout, server not responding.");
 507                 cleanup_exit(255);
 508         }
 509         packet_start(SSH2_MSG_GLOBAL_REQUEST);
 510         packet_put_cstring("keepalive@openssh.com");
 511         packet_put_char(1);     /* boolean: want reply */
 512         packet_send();
 513         /* Insert an empty placeholder to maintain ordering */
 514         client_register_global_confirm(NULL, NULL);
 515 }
 516
 517 /*
 518  * Waits until the client can do something (some data becomes available on
 519  * one of the file descriptors).
 520  */
 521 static void
 522 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
 523     int *maxfdp, u_int *nallocp, int rekeying)
 524 {
 525         struct timeval tv, *tvp;
 526         int ret;
 527
 528         /* Add any selections by the channel mechanism. */
 529         channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
 530
 531         if (!compat20) {
 532                 /* Read from the connection, unless our buffers are full. */
 533                 if (buffer_len(&stdout_buffer) < buffer_high &&
 534                     buffer_len(&stderr_buffer) < buffer_high &&
 535                     channel_not_very_much_buffered_data())
 536                         FD_SET(connection_in, *readsetp);
 537                 /*
 538                  * Read from stdin, unless we have seen EOF or have very much
 539                  * buffered data to send to the server.
 540                  */
 541                 if (!stdin_eof && packet_not_very_much_data_to_write())
 542                         FD_SET(fileno(stdin), *readsetp);
 543
 544                 /* Select stdout/stderr if have data in buffer. */
 545                 if (buffer_len(&stdout_buffer) > 0)
 546                         FD_SET(fileno(stdout), *writesetp);
 547                 if (buffer_len(&stderr_buffer) > 0)
 548                         FD_SET(fileno(stderr), *writesetp);
 549         } else {
 550                 /* channel_prepare_select could have closed the last channel */
 551                 if (session_closed && !channel_still_open() &&
 552                     !packet_have_data_to_write()) {
 553                         /* clear mask since we did not call select() */
 554                         memset(*readsetp, 0, *nallocp);
 555                         memset(*writesetp, 0, *nallocp);
 556                         return;
 557                 } else {
 558                         FD_SET(connection_in, *readsetp);
 559                 }
 560         }
 561
 562         /* Select server connection if have data to write to the server. */
 563         if (packet_have_data_to_write())
 564                 FD_SET(connection_out, *writesetp);
 565
 566         if (muxserver_sock != -1)
 567                 FD_SET(muxserver_sock, *readsetp);
 568
 569         /*
 570          * Wait for something to happen.  This will suspend the process until
 571          * some selected descriptor can be read, written, or has some other
 572          * event pending.
 573          */
 574
 575         if (options.server_alive_interval == 0 || !compat20)
 576                 tvp = NULL;
 577         else {
 578                 tv.tv_sec = options.server_alive_interval;
 579                 tv.tv_usec = 0;
 580                 tvp = &tv;
 581         }
 582         ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
 583         if (ret < 0) {
 584                 char buf[100];
 585
 586                 /*
 587                  * We have to clear the select masks, because we return.
 588                  * We have to return, because the mainloop checks for the flags
 589                  * set by the signal handlers.
 590                  */
 591                 memset(*readsetp, 0, *nallocp);
 592                 memset(*writesetp, 0, *nallocp);
 593
 594                 if (errno == EINTR)
 595                         return;
 596                 /* Note: we might still have data in the buffers. */
 597                 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
 598                 buffer_append(&stderr_buffer, buf, strlen(buf));
 599                 quit_pending = 1;
 600         } else if (ret == 0)
 601                 server_alive_check();
 602 }
 603
 604 static void
 605 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
 606 {
 607         /* Flush stdout and stderr buffers. */
 608         if (buffer_len(bout) > 0)
 609                 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
 610                     buffer_len(bout));
 611         if (buffer_len(berr) > 0)
 612                 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
 613                     buffer_len(berr));
 614
 615         leave_raw_mode();
 616
 617         /*
 618          * Free (and clear) the buffer to reduce the amount of data that gets
 619          * written to swap.
 620          */
 621         buffer_free(bin);
 622         buffer_free(bout);
 623         buffer_free(berr);
 624
 625         /* Send the suspend signal to the program itself. */
 626         kill(getpid(), SIGTSTP);
 627
 628         /* Reset window sizes in case they have changed */
 629         received_window_change_signal = 1;
 630
 631         /* OK, we have been continued by the user. Reinitialize buffers. */
 632         buffer_init(bin);
 633         buffer_init(bout);
 634         buffer_init(berr);
 635
 636         enter_raw_mode();
 637 }
 638
 639 static void
 640 client_process_net_input(fd_set *readset)
 641 {
 642         int len, cont = 0;
 643         char buf[SSH_IOBUFSZ];
 644
 645         /*
 646          * Read input from the server, and add any such data to the buffer of
 647          * the packet subsystem.
 648          */
 649         if (FD_ISSET(connection_in, readset)) {
 650                 /* Read as much as possible. */
 651                 len = roaming_read(connection_in, buf, sizeof(buf), &cont);
 652                 if (len == 0 && cont == 0) {
 653                         /*
 654                          * Received EOF.  The remote host has closed the
 655                          * connection.
 656                          */
 657                         snprintf(buf, sizeof buf,
 658                             "Connection to %.300s closed by remote host.\r\n",
 659                             host);
 660                         buffer_append(&stderr_buffer, buf, strlen(buf));
 661                         quit_pending = 1;
 662                         return;
 663                 }
 664                 /*
 665                  * There is a kernel bug on Solaris that causes select to
 666                  * sometimes wake up even though there is no data available.
 667                  */
 668                 if (len < 0 &&
 669                     (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
 670                         len = 0;
 671
 672                 if (len < 0) {
 673                         /*
 674                          * An error has encountered.  Perhaps there is a
 675                          * network problem.
 676                          */
 677                         snprintf(buf, sizeof buf,
 678                             "Read from remote host %.300s: %.100s\r\n",
 679                             host, strerror(errno));
 680                         buffer_append(&stderr_buffer, buf, strlen(buf));
 681                         quit_pending = 1;
 682                         return;
 683                 }
 684                 packet_process_incoming(buf, len);
 685         }
 686 }
 687
 688 static void
 689 client_status_confirm(int type, Channel *c, void *ctx)
 690 {
 691         struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
 692         char errmsg[256];
 693         int tochan;
 694
 695         /* XXX supress on mux _client_ quietmode */
 696         tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
 697             c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
 698
 699         if (type == SSH2_MSG_CHANNEL_SUCCESS) {
 700                 debug2("%s request accepted on channel %d",
 701                     cr->request_type, c->self);
 702         } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
 703                 if (tochan) {
 704                         snprintf(errmsg, sizeof(errmsg),
 705                             "%s request failed\r\n", cr->request_type);
 706                 } else {
 707                         snprintf(errmsg, sizeof(errmsg),
 708                             "%s request failed on channel %d",
 709                             cr->request_type, c->self);
 710                 }
 711                 /* If error occurred on primary session channel, then exit */
 712                 if (cr->do_close && c->self == session_ident)
 713                         fatal("%s", errmsg);
 714                 /* If error occurred on mux client, append to their stderr */
 715                 if (tochan)
 716                         buffer_append(&c->extended, errmsg, strlen(errmsg));
 717                 else
 718                         error("%s", errmsg);
 719                 if (cr->do_close) {
 720                         chan_read_failed(c);
 721                         chan_write_failed(c);
 722                 }
 723         }
 724         xfree(cr);
 725 }
 726
 727 static void
 728 client_abandon_status_confirm(Channel *c, void *ctx)
 729 {
 730         xfree(ctx);
 731 }
 732
 733 static void
 734 client_expect_confirm(int id, const char *request, int do_close)
 735 {
 736         struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
 737
 738         cr->request_type = request;
 739         cr->do_close = do_close;
 740
 741         channel_register_status_confirm(id, client_status_confirm,
 742             client_abandon_status_confirm, cr);
 743 }
 744
 745 void
 746 client_register_global_confirm(global_confirm_cb *cb, void *ctx)
 747 {
 748         struct global_confirm *gc, *last_gc;
 749
 750         /* Coalesce identical callbacks */
 751         last_gc = TAILQ_LAST(&global_confirms, global_confirms);
 752         if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
 753                 if (++last_gc->ref_count >= INT_MAX)
 754                         fatal("%s: last_gc->ref_count = %d",
 755                             __func__, last_gc->ref_count);
 756                 return;
 757         }
 758
 759         gc = xmalloc(sizeof(*gc));
 760         gc->cb = cb;
 761         gc->ctx = ctx;
 762         gc->ref_count = 1;
 763         TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
 764 }
 765
 766 static void
 767 process_cmdline(void)
 768 {
 769         void (*handler)(int);
 770         char *s, *cmd, *cancel_host;
 771         int delete = 0;
 772         int local = 0, remote = 0, dynamic = 0;
 773         int cancel_port;
 774         Forward fwd;
 775
 776         bzero(&fwd, sizeof(fwd));
 777         fwd.listen_host = fwd.connect_host = NULL;
 778
 779         leave_raw_mode();
 780         handler = signal(SIGINT, SIG_IGN);
 781         cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
 782         if (s == NULL)
 783                 goto out;
 784         while (isspace(*s))
 785                 s++;
 786         if (*s == '-')
 787                 s++;    /* Skip cmdline '-', if any */
 788         if (*s == '\0')
 789                 goto out;
 790
 791         if (*s == 'h' || *s == 'H' || *s == '?') {
 792                 logit("Commands:");
 793                 logit("      -L[bind_address:]port:host:hostport    "
 794                     "Request local forward");
 795                 logit("      -R[bind_address:]port:host:hostport    "
 796                     "Request remote forward");
 797                 logit("      -D[bind_address:]port                  "
 798                     "Request dynamic forward");
 799                 logit("      -KR[bind_address:]port                 "
 800                     "Cancel remote forward");
 801                 if (!options.permit_local_command)
 802                         goto out;
 803                 logit("      !args                                  "
 804                     "Execute local command");
 805                 goto out;
 806         }
 807
 808         if (*s == '!' && options.permit_local_command) {
 809                 s++;
 810                 ssh_local_cmd(s);
 811                 goto out;
 812         }
 813
 814         if (*s == 'K') {
 815                 delete = 1;
 816                 s++;
 817         }
 818         if (*s == 'L')
 819                 local = 1;
 820         else if (*s == 'R')
 821                 remote = 1;
 822         else if (*s == 'D')
 823                 dynamic = 1;
 824         else {
 825                 logit("Invalid command.");
 826                 goto out;
 827         }
 828
 829         if ((local || dynamic) && delete) {
 830                 logit("Not supported.");
 831                 goto out;
 832         }
 833         if (remote && delete && !compat20) {
 834                 logit("Not supported for SSH protocol version 1.");
 835                 goto out;
 836         }
 837
 838         while (isspace(*++s))
 839                 ;
 840
 841         if (delete) {
 842                 cancel_port = 0;
 843                 cancel_host = hpdelim(&s);      /* may be NULL */
 844                 if (s != NULL) {
 845                         cancel_port = a2port(s);
 846                         cancel_host = cleanhostname(cancel_host);
 847                 } else {
 848                         cancel_port = a2port(cancel_host);
 849                         cancel_host = NULL;
 850                 }
 851                 if (cancel_port <= 0) {
 852                         logit("Bad forwarding close port");
 853                         goto out;
 854                 }
 855                 channel_request_rforward_cancel(cancel_host, cancel_port);
 856         } else {
 857                 if (!parse_forward(&fwd, s, dynamic, remote)) {
 858                         logit("Bad forwarding specification.");
 859                         goto out;
 860                 }
 861                 if (local || dynamic) {
 862                         if (channel_setup_local_fwd_listener(fwd.listen_host,
 863                             fwd.listen_port, fwd.connect_host,
 864                             fwd.connect_port, options.gateway_ports) < 0) {
 865                                 logit("Port forwarding failed.");
 866                                 goto out;
 867                         }
 868                 } else {
 869                         if (channel_request_remote_forwarding(fwd.listen_host,
 870                             fwd.listen_port, fwd.connect_host,
 871                             fwd.connect_port) < 0) {
 872                                 logit("Port forwarding failed.");
 873                                 goto out;
 874                         }
 875                 }
 876
 877                 logit("Forwarding port.");
 878         }
 879
 880 out:
 881         signal(SIGINT, handler);
 882         enter_raw_mode();
 883         if (cmd)
 884                 xfree(cmd);
 885         if (fwd.listen_host != NULL)
 886                 xfree(fwd.listen_host);
 887         if (fwd.connect_host != NULL)
 888                 xfree(fwd.connect_host);
 889 }
 890
 891 /*
 892  * Process the characters one by one, call with c==NULL for proto1 case.
 893  */
 894 static int
 895 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
 896     char *buf, int len)
 897 {
 898         char string[1024];
 899         pid_t pid;
 900         int bytes = 0;
 901         u_int i;
 902         u_char ch;
 903         char *s;
 904         int *escape_pendingp, escape_char;
 905         struct escape_filter_ctx *efc;
 906
 907         if (c == NULL) {
 908                 escape_pendingp = &escape_pending1;
 909                 escape_char = escape_char1;
 910         } else {
 911                 if (c->filter_ctx == NULL)
 912                         return 0;
 913                 efc = (struct escape_filter_ctx *)c->filter_ctx;
 914                 escape_pendingp = &efc->escape_pending;
 915                 escape_char = efc->escape_char;
 916         }
 917
 918         if (len <= 0)
 919                 return (0);
 920
 921         for (i = 0; i < (u_int)len; i++) {
 922                 /* Get one character at a time. */
 923                 ch = buf[i];
 924
 925                 if (*escape_pendingp) {
 926                         /* We have previously seen an escape character. */
 927                         /* Clear the flag now. */
 928                         *escape_pendingp = 0;
 929
 930                         /* Process the escaped character. */
 931                         switch (ch) {
 932                         case '.':
 933                                 /* Terminate the connection. */
 934                                 snprintf(string, sizeof string, "%c.\r\n",
 935                                     escape_char);
 936                                 buffer_append(berr, string, strlen(string));
 937
 938                                 if (c && c->ctl_fd != -1) {
 939                                         chan_read_failed(c);
 940                                         chan_write_failed(c);
 941                                         return 0;
 942                                 } else
 943                                         quit_pending = 1;
 944                                 return -1;
 945
 946                         case 'Z' - 64:
 947                                 /* XXX support this for mux clients */
 948                                 if (c && c->ctl_fd != -1) {
 949  noescape:
 950                                         snprintf(string, sizeof string,
 951                                             "%c%c escape not available to "
 952                                             "multiplexed sessions\r\n",
 953                                             escape_char, ch);
 954                                         buffer_append(berr, string,
 955                                             strlen(string));
 956                                         continue;
 957                                 }
 958                                 /* Suspend the program. Inform the user */
 959                                 snprintf(string, sizeof string,
 960                                     "%c^Z [suspend ssh]\r\n", escape_char);
 961                                 buffer_append(berr, string, strlen(string));
 962
 963                                 /* Restore terminal modes and suspend. */
 964                                 client_suspend_self(bin, bout, berr);
 965
 966                                 /* We have been continued. */
 967                                 continue;
 968
 969                         case 'B':
 970                                 if (compat20) {
 971                                         snprintf(string, sizeof string,
 972                                             "%cB\r\n", escape_char);
 973                                         buffer_append(berr, string,
 974                                             strlen(string));
 975                                         channel_request_start(session_ident,
 976                                             "break", 0);
 977                                         packet_put_int(1000);
 978                                         packet_send();
 979                                 }
 980                                 continue;
 981
 982                         case 'R':
 983                                 if (compat20) {
 984                                         if (datafellows & SSH_BUG_NOREKEY)
 985                                                 logit("Server does not "
 986                                                     "support re-keying");
 987                                         else
 988                                                 need_rekeying = 1;
 989                                 }
 990                                 continue;
 991
 992                         case '&':
 993                                 if (c && c->ctl_fd != -1)
 994                                         goto noescape;
 995                                 /*
 996                                  * Detach the program (continue to serve
 997                                  * connections, but put in background and no
 998                                  * more new connections).
 999                                  */
1000                                 /* Restore tty modes. */
1001                                 leave_raw_mode();
1002
1003                                 /* Stop listening for new connections. */
1004                                 channel_stop_listening();
1005
1006                                 snprintf(string, sizeof string,
1007                                     "%c& [backgrounded]\n", escape_char);
1008                                 buffer_append(berr, string, strlen(string));
1009
1010                                 /* Fork into background. */
1011                                 pid = fork();
1012                                 if (pid < 0) {
1013                                         error("fork: %.100s", strerror(errno));
1014                                         continue;
1015                                 }
1016                                 if (pid != 0) { /* This is the parent. */
1017                                         /* The parent just exits. */
1018                                         exit(0);
1019                                 }
1020                                 /* The child continues serving connections. */
1021                                 if (compat20) {
1022                                         buffer_append(bin, "\004", 1);
1023                                         /* fake EOF on stdin */
1024                                         return -1;
1025                                 } else if (!stdin_eof) {
1026                                         /*
1027                                          * Sending SSH_CMSG_EOF alone does not
1028                                          * always appear to be enough.  So we
1029                                          * try to send an EOF character first.
1030                                          */
1031                                         packet_start(SSH_CMSG_STDIN_DATA);
1032                                         packet_put_string("\004", 1);
1033                                         packet_send();
1034                                         /* Close stdin. */
1035                                         stdin_eof = 1;
1036                                         if (buffer_len(bin) == 0) {
1037                                                 packet_start(SSH_CMSG_EOF);
1038                                                 packet_send();
1039                                         }
1040                                 }
1041                                 continue;
1042
1043                         case '?':
1044                                 if (c && c->ctl_fd != -1) {
1045                                         snprintf(string, sizeof string,
1046 "%c?\r\n\
1047 Supported escape sequences:\r\n\
1048   %c.  - terminate session\r\n\
1049   %cB  - send a BREAK to the remote system\r\n\
1050   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1051   %c#  - list forwarded connections\r\n\
1052   %c?  - this message\r\n\
1053   %c%c  - send the escape character by typing it twice\r\n\
1054 (Note that escapes are only recognized immediately after newline.)\r\n",
1055                                             escape_char, escape_char,
1056                                             escape_char, escape_char,
1057                                             escape_char, escape_char,
1058                                             escape_char, escape_char);
1059                                 } else {
1060                                         snprintf(string, sizeof string,
1061 "%c?\r\n\
1062 Supported escape sequences:\r\n\
1063   %c.  - terminate connection (and any multiplexed sessions)\r\n\
1064   %cB  - send a BREAK to the remote system\r\n\
1065   %cC  - open a command line\r\n\
1066   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1067   %c^Z - suspend ssh\r\n\
1068   %c#  - list forwarded connections\r\n\
1069   %c&  - background ssh (when waiting for connections to terminate)\r\n\
1070   %c?  - this message\r\n\
1071   %c%c  - send the escape character by typing it twice\r\n\
1072 (Note that escapes are only recognized immediately after newline.)\r\n",
1073                                             escape_char, escape_char,
1074                                             escape_char, escape_char,
1075                                             escape_char, escape_char,
1076                                             escape_char, escape_char,
1077                                             escape_char, escape_char,
1078                                             escape_char);
1079                                 }
1080                                 buffer_append(berr, string, strlen(string));
1081                                 continue;
1082
1083                         case '#':
1084                                 snprintf(string, sizeof string, "%c#\r\n",
1085                                     escape_char);
1086                                 buffer_append(berr, string, strlen(string));
1087                                 s = channel_open_message();
1088                                 buffer_append(berr, s, strlen(s));
1089                                 xfree(s);
1090                                 continue;
1091
1092                         case 'C':
1093                                 if (c && c->ctl_fd != -1)
1094                                         goto noescape;
1095                                 process_cmdline();
1096                                 continue;
1097
1098                         default:
1099                                 if (ch != escape_char) {
1100                                         buffer_put_char(bin, escape_char);
1101                                         bytes++;
1102                                 }
1103                                 /* Escaped characters fall through here */
1104                                 break;
1105                         }
1106                 } else {
1107                         /*
1108                          * The previous character was not an escape char.
1109                          * Check if this is an escape.
1110                          */
1111                         if (last_was_cr && ch == escape_char) {
1112                                 /*
1113                                  * It is. Set the flag and continue to
1114                                  * next character.
1115                                  */
1116                                 *escape_pendingp = 1;
1117                                 continue;
1118                         }
1119                 }
1120
1121                 /*
1122                  * Normal character.  Record whether it was a newline,
1123                  * and append it to the buffer.
1124                  */
1125                 last_was_cr = (ch == '\r' || ch == '\n');
1126                 buffer_put_char(bin, ch);
1127                 bytes++;
1128         }
1129         return bytes;
1130 }
1131
1132 static void
1133 client_process_input(fd_set *readset)
1134 {
1135         int len;
1136         char buf[SSH_IOBUFSZ];
1137
1138         /* Read input from stdin. */
1139         if (FD_ISSET(fileno(stdin), readset)) {
1140                 /* Read as much as possible. */
1141                 len = read(fileno(stdin), buf, sizeof(buf));
1142                 if (len < 0 &&
1143                     (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
1144                         return;         /* we'll try again later */
1145                 if (len <= 0) {
1146                         /*
1147                          * Received EOF or error.  They are treated
1148                          * similarly, except that an error message is printed
1149                          * if it was an error condition.
1150                          */
1151                         if (len < 0) {
1152                                 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1153                                     strerror(errno));
1154                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1155                         }
1156                         /* Mark that we have seen EOF. */
1157                         stdin_eof = 1;
1158                         /*
1159                          * Send an EOF message to the server unless there is
1160                          * data in the buffer.  If there is data in the
1161                          * buffer, no message will be sent now.  Code
1162                          * elsewhere will send the EOF when the buffer
1163                          * becomes empty if stdin_eof is set.
1164                          */
1165                         if (buffer_len(&stdin_buffer) == 0) {
1166                                 packet_start(SSH_CMSG_EOF);
1167                                 packet_send();
1168                         }
1169                 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1170                         /*
1171                          * Normal successful read, and no escape character.
1172                          * Just append the data to buffer.
1173                          */
1174                         buffer_append(&stdin_buffer, buf, len);
1175                 } else {
1176                         /*
1177                          * Normal, successful read.  But we have an escape
1178                          * character and have to process the characters one
1179                          * by one.
1180                          */
1181                         if (process_escapes(NULL, &stdin_buffer,
1182                             &stdout_buffer, &stderr_buffer, buf, len) == -1)
1183                                 return;
1184                 }
1185         }
1186 }
1187
1188 static void
1189 client_process_output(fd_set *writeset)
1190 {
1191         int len;
1192         char buf[100];
1193
1194         /* Write buffered output to stdout. */
1195         if (FD_ISSET(fileno(stdout), writeset)) {
1196                 /* Write as much data as possible. */
1197                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1198                     buffer_len(&stdout_buffer));
1199                 if (len <= 0) {
1200                         if (errno == EINTR || errno == EAGAIN ||
1201                             errno == EWOULDBLOCK)
1202                                 len = 0;
1203                         else {
1204                                 /*
1205                                  * An error or EOF was encountered.  Put an
1206                                  * error message to stderr buffer.
1207                                  */
1208                                 snprintf(buf, sizeof buf,
1209                                     "write stdout: %.50s\r\n", strerror(errno));
1210                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1211                                 quit_pending = 1;
1212                                 return;
1213                         }
1214                 }
1215                 /* Consume printed data from the buffer. */
1216                 buffer_consume(&stdout_buffer, len);
1217         }
1218         /* Write buffered output to stderr. */
1219         if (FD_ISSET(fileno(stderr), writeset)) {
1220                 /* Write as much data as possible. */
1221                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1222                     buffer_len(&stderr_buffer));
1223                 if (len <= 0) {
1224                         if (errno == EINTR || errno == EAGAIN ||
1225                             errno == EWOULDBLOCK)
1226                                 len = 0;
1227                         else {
1228                                 /*
1229                                  * EOF or error, but can't even print
1230                                  * error message.
1231                                  */
1232                                 quit_pending = 1;
1233                                 return;
1234                         }
1235                 }
1236                 /* Consume printed characters from the buffer. */
1237                 buffer_consume(&stderr_buffer, len);
1238         }
1239 }
1240
1241 /*
1242  * Get packets from the connection input buffer, and process them as long as
1243  * there are packets available.
1244  *
1245  * Any unknown packets received during the actual
1246  * session cause the session to terminate.  This is
1247  * intended to make debugging easier since no
1248  * confirmations are sent.  Any compatible protocol
1249  * extensions must be negotiated during the
1250  * preparatory phase.
1251  */
1252
1253 static void
1254 client_process_buffered_input_packets(void)
1255 {
1256         dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1257             compat20 ? xxx_kex : NULL);
1258 }
1259
1260 /* scan buf[] for '~' before sending data to the peer */
1261
1262 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1263 void *
1264 client_new_escape_filter_ctx(int escape_char)
1265 {
1266         struct escape_filter_ctx *ret;
1267
1268         ret = xmalloc(sizeof(*ret));
1269         ret->escape_pending = 0;
1270         ret->escape_char = escape_char;
1271         return (void *)ret;
1272 }
1273
1274 /* Free the escape filter context on channel free */
1275 void
1276 client_filter_cleanup(int cid, void *ctx)
1277 {
1278         xfree(ctx);
1279 }
1280
1281 int
1282 client_simple_escape_filter(Channel *c, char *buf, int len)
1283 {
1284         if (c->extended_usage != CHAN_EXTENDED_WRITE)
1285                 return 0;
1286
1287         return process_escapes(c, &c->input, &c->output, &c->extended,
1288             buf, len);
1289 }
1290
1291 static void
1292 client_channel_closed(int id, void *arg)
1293 {
1294         channel_cancel_cleanup(id);
1295         session_closed = 1;
1296         leave_raw_mode();
1297 }
1298
1299 /*
1300  * Implements the interactive session with the server.  This is called after
1301  * the user has been authenticated, and a command has been started on the
1302  * remote host.  If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1303  * used as an escape character for terminating or suspending the session.
1304  */
1305
1306 int
1307 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1308 {
1309         fd_set *readset = NULL, *writeset = NULL;
1310         double start_time, total_time;
1311         int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1312         u_int64_t ibytes, obytes;
1313         u_int nalloc = 0;
1314         char buf[100];
1315
1316         debug("Entering interactive session.");
1317
1318         start_time = get_current_time();
1319
1320         /* Initialize variables. */
1321         escape_pending1 = 0;
1322         last_was_cr = 1;
1323         exit_status = -1;
1324         stdin_eof = 0;
1325         buffer_high = 64 * 1024;
1326         connection_in = packet_get_connection_in();
1327         connection_out = packet_get_connection_out();
1328         max_fd = MAX(connection_in, connection_out);
1329         if (muxserver_sock != -1)
1330                 max_fd = MAX(max_fd, muxserver_sock);
1331
1332         if (!compat20) {
1333                 /* enable nonblocking unless tty */
1334                 if (!isatty(fileno(stdin)))
1335                         set_nonblock(fileno(stdin));
1336                 if (!isatty(fileno(stdout)))
1337                         set_nonblock(fileno(stdout));
1338                 if (!isatty(fileno(stderr)))
1339                         set_nonblock(fileno(stderr));
1340                 max_fd = MAX(max_fd, fileno(stdin));
1341                 max_fd = MAX(max_fd, fileno(stdout));
1342                 max_fd = MAX(max_fd, fileno(stderr));
1343         }
1344         quit_pending = 0;
1345         escape_char1 = escape_char_arg;
1346
1347         /* Initialize buffers. */
1348         buffer_init(&stdin_buffer);
1349         buffer_init(&stdout_buffer);
1350         buffer_init(&stderr_buffer);
1351
1352         client_init_dispatch();
1353
1354         /*
1355          * Set signal handlers, (e.g. to restore non-blocking mode)
1356          * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1357          */
1358         if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1359                 signal(SIGHUP, signal_handler);
1360         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1361                 signal(SIGINT, signal_handler);
1362         if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1363                 signal(SIGQUIT, signal_handler);
1364         if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1365                 signal(SIGTERM, signal_handler);
1366         signal(SIGWINCH, window_change_handler);
1367
1368         if (have_pty)
1369                 enter_raw_mode();
1370
1371         if (compat20) {
1372                 session_ident = ssh2_chan_id;
1373                 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1374                         channel_register_filter(session_ident,
1375                             client_simple_escape_filter, NULL,
1376                             client_filter_cleanup,
1377                             client_new_escape_filter_ctx(escape_char_arg));
1378                 if (session_ident != -1)
1379                         channel_register_cleanup(session_ident,
1380                             client_channel_closed, 0);
1381         } else {
1382                 /* Check if we should immediately send eof on stdin. */
1383                 client_check_initial_eof_on_stdin();
1384         }
1385
1386         /* Main loop of the client for the interactive session mode. */
1387         while (!quit_pending) {
1388
1389                 /* Process buffered packets sent by the server. */
1390                 client_process_buffered_input_packets();
1391
1392                 if (compat20 && session_closed && !channel_still_open())
1393                         break;
1394
1395                 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1396
1397                 if (rekeying) {
1398                         debug("rekeying in progress");
1399                 } else {
1400                         /*
1401                          * Make packets of buffered stdin data, and buffer
1402                          * them for sending to the server.
1403                          */
1404                         if (!compat20)
1405                                 client_make_packets_from_stdin_data();
1406
1407                         /*
1408                          * Make packets from buffered channel data, and
1409                          * enqueue them for sending to the server.
1410                          */
1411                         if (packet_not_very_much_data_to_write())
1412                                 channel_output_poll();
1413
1414                         /*
1415                          * Check if the window size has changed, and buffer a
1416                          * message about it to the server if so.
1417                          */
1418                         client_check_window_change();
1419
1420                         if (quit_pending)
1421                                 break;
1422                 }
1423                 /*
1424                  * Wait until we have something to do (something becomes
1425                  * available on one of the descriptors).
1426                  */
1427                 max_fd2 = max_fd;
1428                 client_wait_until_can_do_something(&readset, &writeset,
1429                     &max_fd2, &nalloc, rekeying);
1430
1431                 if (quit_pending)
1432                         break;
1433
1434                 /* Do channel operations unless rekeying in progress. */
1435                 if (!rekeying) {
1436                         channel_after_select(readset, writeset);
1437
1438 #ifdef GSSAPI
1439                         if (options.gss_renewal_rekey &&
1440                             ssh_gssapi_credentials_updated((Gssctxt *)GSS_C_NO_CONTEXT)) {
1441                                 debug("credentials updated - forcing rekey");
1442                                 need_rekeying = 1;
1443                         }
1444 #endif
1445
1446                         if (need_rekeying || packet_need_rekeying()) {
1447                                 debug("need rekeying");
1448                                 xxx_kex->done = 0;
1449                                 kex_send_kexinit(xxx_kex);
1450                                 need_rekeying = 0;
1451                         }
1452                 }
1453
1454                 /* Buffer input from the connection.  */
1455                 client_process_net_input(readset);
1456
1457                 /* Accept control connections.  */
1458                 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1459                         if (muxserver_accept_control())
1460                                 quit_pending = 1;
1461                 }
1462
1463                 if (quit_pending)
1464                         break;
1465
1466                 if (!compat20) {
1467                         /* Buffer data from stdin */
1468                         client_process_input(readset);
1469                         /*
1470                          * Process output to stdout and stderr.  Output to
1471                          * the connection is processed elsewhere (above).
1472                          */
1473                         client_process_output(writeset);
1474                 }
1475
1476                 /*
1477                  * Send as much buffered packet data as possible to the
1478                  * sender.
1479                  */
1480                 if (FD_ISSET(connection_out, writeset))
1481                         packet_write_poll();
1482         }
1483         if (readset)
1484                 xfree(readset);
1485         if (writeset)
1486                 xfree(writeset);
1487
1488         /* Terminate the session. */
1489
1490         /* Stop watching for window change. */
1491         signal(SIGWINCH, SIG_DFL);
1492
1493         if (compat20) {
1494                 packet_start(SSH2_MSG_DISCONNECT);
1495                 packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1496                 packet_put_cstring("disconnected by user");
1497                 packet_send();
1498                 packet_write_wait();
1499         }
1500
1501         channel_free_all();
1502
1503         if (have_pty)
1504                 leave_raw_mode();
1505
1506         /* restore blocking io */
1507         if (!isatty(fileno(stdin)))
1508                 unset_nonblock(fileno(stdin));
1509         if (!isatty(fileno(stdout)))
1510                 unset_nonblock(fileno(stdout));
1511         if (!isatty(fileno(stderr)))
1512                 unset_nonblock(fileno(stderr));
1513
1514         /*
1515          * If there was no shell or command requested, there will be no remote
1516          * exit status to be returned.  In that case, clear error code if the
1517          * connection was deliberately terminated at this end.
1518          */
1519         if (no_shell_flag && received_signal == SIGTERM) {
1520                 received_signal = 0;
1521                 exit_status = 0;
1522         }
1523
1524         if (received_signal)
1525                 fatal("Killed by signal %d.", (int) received_signal);
1526
1527         /*
1528          * In interactive mode (with pseudo tty) display a message indicating
1529          * that the connection has been closed.
1530          */
1531         if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1532                 snprintf(buf, sizeof buf,
1533                     "Connection to %.64s closed.\r\n", host);
1534                 buffer_append(&stderr_buffer, buf, strlen(buf));
1535         }
1536
1537         /* Output any buffered data for stdout. */
1538         while (buffer_len(&stdout_buffer) > 0) {
1539                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1540                     buffer_len(&stdout_buffer));
1541                 if (len <= 0) {
1542                         error("Write failed flushing stdout buffer.");
1543                         break;
1544                 }
1545                 buffer_consume(&stdout_buffer, len);
1546         }
1547
1548         /* Output any buffered data for stderr. */
1549         while (buffer_len(&stderr_buffer) > 0) {
1550                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1551                     buffer_len(&stderr_buffer));
1552                 if (len <= 0) {
1553                         error("Write failed flushing stderr buffer.");
1554                         break;
1555                 }
1556                 buffer_consume(&stderr_buffer, len);
1557         }
1558
1559         /* Clear and free any buffers. */
1560         memset(buf, 0, sizeof(buf));
1561         buffer_free(&stdin_buffer);
1562         buffer_free(&stdout_buffer);
1563         buffer_free(&stderr_buffer);
1564
1565         /* Report bytes transferred, and transfer rates. */
1566         total_time = get_current_time() - start_time;
1567         packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1568         packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1569         verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1570             obytes, ibytes, total_time);
1571         if (total_time > 0)
1572                 verbose("Bytes per second: sent %.1f, received %.1f",
1573                     obytes / total_time, ibytes / total_time);
1574         /* Return the exit status of the program. */
1575         debug("Exit status %d", exit_status);
1576         return exit_status;
1577 }
1578
1579 /*********/
1580
1581 static void
1582 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1583 {
1584         u_int data_len;
1585         char *data = packet_get_string(&data_len);
1586         packet_check_eom();
1587         buffer_append(&stdout_buffer, data, data_len);
1588         memset(data, 0, data_len);
1589         xfree(data);
1590 }
1591 static void
1592 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1593 {
1594         u_int data_len;
1595         char *data = packet_get_string(&data_len);
1596         packet_check_eom();
1597         buffer_append(&stderr_buffer, data, data_len);
1598         memset(data, 0, data_len);
1599         xfree(data);
1600 }
1601 static void
1602 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1603 {
1604         exit_status = packet_get_int();
1605         packet_check_eom();
1606         /* Acknowledge the exit. */
1607         packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1608         packet_send();
1609         /*
1610          * Must wait for packet to be sent since we are
1611          * exiting the loop.
1612          */
1613         packet_write_wait();
1614         /* Flag that we want to exit. */
1615         quit_pending = 1;
1616 }
1617 static void
1618 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1619 {
1620         Channel *c = NULL;
1621         int remote_id, sock;
1622
1623         /* Read the remote channel number from the message. */
1624         remote_id = packet_get_int();
1625         packet_check_eom();
1626
1627         /*
1628          * Get a connection to the local authentication agent (this may again
1629          * get forwarded).
1630          */
1631         sock = ssh_get_authentication_socket();
1632
1633         /*
1634          * If we could not connect the agent, send an error message back to
1635          * the server. This should never happen unless the agent dies,
1636          * because authentication forwarding is only enabled if we have an
1637          * agent.
1638          */
1639         if (sock >= 0) {
1640                 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1641                     -1, 0, 0, 0, "authentication agent connection", 1);
1642                 c->remote_id = remote_id;
1643                 c->force_drain = 1;
1644         }
1645         if (c == NULL) {
1646                 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1647                 packet_put_int(remote_id);
1648         } else {
1649                 /* Send a confirmation to the remote host. */
1650                 debug("Forwarding authentication connection.");
1651                 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1652                 packet_put_int(remote_id);
1653                 packet_put_int(c->self);
1654         }
1655         packet_send();
1656 }
1657
1658 static Channel *
1659 client_request_forwarded_tcpip(const char *request_type, int rchan)
1660 {
1661         Channel *c = NULL;
1662         char *listen_address, *originator_address;
1663         u_short listen_port, originator_port;
1664
1665         /* Get rest of the packet */
1666         listen_address = packet_get_string(NULL);
1667         listen_port = packet_get_int();
1668         originator_address = packet_get_string(NULL);
1669         originator_port = packet_get_int();
1670         packet_check_eom();
1671
1672         debug("client_request_forwarded_tcpip: listen %s port %d, "
1673             "originator %s port %d", listen_address, listen_port,
1674             originator_address, originator_port);
1675
1676         c = channel_connect_by_listen_address(listen_port,
1677             "forwarded-tcpip", originator_address);
1678
1679         xfree(originator_address);
1680         xfree(listen_address);
1681         return c;
1682 }
1683
1684 static Channel *
1685 client_request_x11(const char *request_type, int rchan)
1686 {
1687         Channel *c = NULL;
1688         char *originator;
1689         u_short originator_port;
1690         int sock;
1691
1692         if (!options.forward_x11) {
1693                 error("Warning: ssh server tried X11 forwarding.");
1694                 error("Warning: this is probably a break-in attempt by a "
1695                     "malicious server.");
1696                 return NULL;
1697         }
1698         originator = packet_get_string(NULL);
1699         if (datafellows & SSH_BUG_X11FWD) {
1700                 debug2("buggy server: x11 request w/o originator_port");
1701                 originator_port = 0;
1702         } else {
1703                 originator_port = packet_get_int();
1704         }
1705         packet_check_eom();
1706         /* XXX check permission */
1707         debug("client_request_x11: request from %s %d", originator,
1708             originator_port);
1709         xfree(originator);
1710         sock = x11_connect_display();
1711         if (sock < 0)
1712                 return NULL;
1713         /* again is this really necessary for X11? */
1714         if (options.hpn_disabled)
1715         c = channel_new("x11",
1716             SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1717             CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1718         else
1719                 c = channel_new("x11",
1720                     SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1721                     options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1722         c->force_drain = 1;
1723         return c;
1724 }
1725
1726 static Channel *
1727 client_request_agent(const char *request_type, int rchan)
1728 {
1729         Channel *c = NULL;
1730         int sock;
1731
1732         if (!options.forward_agent) {
1733                 error("Warning: ssh server tried agent forwarding.");
1734                 error("Warning: this is probably a break-in attempt by a "
1735                     "malicious server.");
1736                 return NULL;
1737         }
1738         sock = ssh_get_authentication_socket();
1739         if (sock < 0)
1740                 return NULL;
1741         if (options.hpn_disabled)
1742         c = channel_new("authentication agent connection",
1743             SSH_CHANNEL_OPEN, sock, sock, -1,
1744                     CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1745                     "authentication agent connection", 1);
1746        else
1747         c = channel_new("authentication agent connection",
1748             SSH_CHANNEL_OPEN, sock, sock, -1,
1749                    options.hpn_buffer_size, options.hpn_buffer_size, 0,
1750             "authentication agent connection", 1);
1751         c->force_drain = 1;
1752         return c;
1753 }
1754
1755 int
1756 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1757 {
1758         Channel *c;
1759         int fd;
1760
1761         if (tun_mode == SSH_TUNMODE_NO)
1762                 return 0;
1763
1764         if (!compat20) {
1765                 error("Tunnel forwarding is not supported for protocol 1");
1766                 return -1;
1767         }
1768
1769         debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1770
1771         /* Open local tunnel device */
1772         if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1773                 error("Tunnel device open failed.");
1774                 return -1;
1775         }
1776
1777         if(options.hpn_disabled)
1778         c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1779                                 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1780                                 0, "tun", 1);
1781         else
1782         c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1783                                 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
1784                                 0, "tun", 1);
1785         c->datagram = 1;
1786
1787
1788
1789 #if defined(SSH_TUN_FILTER)
1790         if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1791                 channel_register_filter(c->self, sys_tun_infilter,
1792                     sys_tun_outfilter, NULL, NULL);
1793 #endif
1794
1795         packet_start(SSH2_MSG_CHANNEL_OPEN);
1796         packet_put_cstring("tun@openssh.com");
1797         packet_put_int(c->self);
1798         packet_put_int(c->local_window_max);
1799         packet_put_int(c->local_maxpacket);
1800         packet_put_int(tun_mode);
1801         packet_put_int(remote_tun);
1802         packet_send();
1803
1804         return 0;
1805 }
1806
1807 /* XXXX move to generic input handler */
1808 static void
1809 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1810 {
1811         Channel *c = NULL;
1812         char *ctype;
1813         int rchan;
1814         u_int rmaxpack, rwindow, len;
1815
1816         ctype = packet_get_string(&len);
1817         rchan = packet_get_int();
1818         rwindow = packet_get_int();
1819         rmaxpack = packet_get_int();
1820
1821         debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1822             ctype, rchan, rwindow, rmaxpack);
1823
1824         if (strcmp(ctype, "forwarded-tcpip") == 0) {
1825                 c = client_request_forwarded_tcpip(ctype, rchan);
1826         } else if (strcmp(ctype, "x11") == 0) {
1827                 c = client_request_x11(ctype, rchan);
1828         } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1829                 c = client_request_agent(ctype, rchan);
1830         }
1831 /* XXX duplicate : */
1832         if (c != NULL) {
1833                 debug("confirm %s", ctype);
1834                 c->remote_id = rchan;
1835                 c->remote_window = rwindow;
1836                 c->remote_maxpacket = rmaxpack;
1837                 if (c->type != SSH_CHANNEL_CONNECTING) {
1838                         packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1839                         packet_put_int(c->remote_id);
1840                         packet_put_int(c->self);
1841                         packet_put_int(c->local_window);
1842                         packet_put_int(c->local_maxpacket);
1843                         packet_send();
1844                 }
1845         } else {
1846                 debug("failure %s", ctype);
1847                 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1848                 packet_put_int(rchan);
1849                 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1850                 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1851                         packet_put_cstring("open failed");
1852                         packet_put_cstring("");
1853                 }
1854                 packet_send();
1855         }
1856         xfree(ctype);
1857 }
1858 static void
1859 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1860 {
1861         Channel *c = NULL;
1862         int exitval, id, reply, success = 0;
1863         char *rtype;
1864
1865         id = packet_get_int();
1866         rtype = packet_get_string(NULL);
1867         reply = packet_get_char();
1868
1869         debug("client_input_channel_req: channel %d rtype %s reply %d",
1870             id, rtype, reply);
1871
1872         if (id == -1) {
1873                 error("client_input_channel_req: request for channel -1");
1874         } else if ((c = channel_lookup(id)) == NULL) {
1875                 error("client_input_channel_req: channel %d: "
1876                     "unknown channel", id);
1877         } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1878                 packet_check_eom();
1879                 chan_rcvd_eow(c);
1880         } else if (strcmp(rtype, "exit-status") == 0) {
1881                 exitval = packet_get_int();
1882                 if (id == session_ident) {
1883                         success = 1;
1884                         exit_status = exitval;
1885                 } else if (c->ctl_fd == -1) {
1886                         error("client_input_channel_req: unexpected channel %d",
1887                             session_ident);
1888                 } else {
1889                         atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1890                         success = 1;
1891                 }
1892                 packet_check_eom();
1893         }
1894         if (reply) {
1895                 packet_start(success ?
1896                     SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1897                 packet_put_int(c->remote_id);
1898                 packet_send();
1899         }
1900         xfree(rtype);
1901 }
1902 static void
1903 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1904 {
1905         char *rtype;
1906         int want_reply;
1907         int success = 0;
1908
1909         rtype = packet_get_string(NULL);
1910         want_reply = packet_get_char();
1911         debug("client_input_global_request: rtype %s want_reply %d",
1912             rtype, want_reply);
1913         if (want_reply) {
1914                 packet_start(success ?
1915                     SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1916                 packet_send();
1917                 packet_write_wait();
1918         }
1919         xfree(rtype);
1920 }
1921
1922 void
1923 client_session2_setup(int id, int want_tty, int want_subsystem,
1924     const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1925 {
1926         int len;
1927         Channel *c = NULL;
1928
1929         debug2("%s: id %d", __func__, id);
1930
1931         if ((c = channel_lookup(id)) == NULL)
1932                 fatal("client_session2_setup: channel %d: unknown channel", id);
1933
1934         if (want_tty) {
1935                 struct winsize ws;
1936
1937                 /* Store window size in the packet. */
1938                 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1939                         memset(&ws, 0, sizeof(ws));
1940
1941                 channel_request_start(id, "pty-req", 1);
1942                 client_expect_confirm(id, "PTY allocation", 0);
1943                 packet_put_cstring(term != NULL ? term : "");
1944                 packet_put_int((u_int)ws.ws_col);
1945                 packet_put_int((u_int)ws.ws_row);
1946                 packet_put_int((u_int)ws.ws_xpixel);
1947                 packet_put_int((u_int)ws.ws_ypixel);
1948                 if (tiop == NULL)
1949                         tiop = get_saved_tio();
1950                 tty_make_modes(-1, tiop);
1951                 packet_send();
1952                 /* XXX wait for reply */
1953                 c->client_tty = 1;
1954         }
1955
1956         /* Transfer any environment variables from client to server */
1957         if (options.num_send_env != 0 && env != NULL) {
1958                 int i, j, matched;
1959                 char *name, *val;
1960
1961                 debug("Sending environment.");
1962                 for (i = 0; env[i] != NULL; i++) {
1963                         /* Split */
1964                         name = xstrdup(env[i]);
1965                         if ((val = strchr(name, '=')) == NULL) {
1966                                 xfree(name);
1967                                 continue;
1968                         }
1969                         *val++ = '\0';
1970
1971                         matched = 0;
1972                         for (j = 0; j < options.num_send_env; j++) {
1973                                 if (match_pattern(name, options.send_env[j])) {
1974                                         matched = 1;
1975                                         break;
1976                                 }
1977                         }
1978                         if (!matched) {
1979                                 debug3("Ignored env %s", name);
1980                                 xfree(name);
1981                                 continue;
1982                         }
1983
1984                         debug("Sending env %s = %s", name, val);
1985                         channel_request_start(id, "env", 0);
1986                         packet_put_cstring(name);
1987                         packet_put_cstring(val);
1988                         packet_send();
1989                         xfree(name);
1990                 }
1991         }
1992
1993         len = buffer_len(cmd);
1994         if (len > 0) {
1995                 if (len > 900)
1996                         len = 900;
1997                 if (want_subsystem) {
1998                         debug("Sending subsystem: %.*s",
1999                             len, (u_char*)buffer_ptr(cmd));
2000                         channel_request_start(id, "subsystem", 1);
2001                         client_expect_confirm(id, "subsystem", 1);
2002                 } else {
2003                         debug("Sending command: %.*s",
2004                             len, (u_char*)buffer_ptr(cmd));
2005                         channel_request_start(id, "exec", 1);
2006                         client_expect_confirm(id, "exec", 1);
2007                 }
2008                 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2009                 packet_send();
2010         } else {
2011                 channel_request_start(id, "shell", 1);
2012                 client_expect_confirm(id, "shell", 1);
2013                 packet_send();
2014         }
2015 }
2016
2017 static void
2018 client_init_dispatch_20(void)
2019 {
2020         dispatch_init(&dispatch_protocol_error);
2021
2022         dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2023         dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2024         dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2025         dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2026         dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2027         dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2028         dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2029         dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2030         dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2031         dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2032         dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2033         dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2034
2035         /* rekeying */
2036         dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2037
2038         /* global request reply messages */
2039         dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2040         dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2041 }
2042
2043 static void
2044 client_init_dispatch_13(void)
2045 {
2046         dispatch_init(NULL);
2047         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2048         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2049         dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2050         dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2051         dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2052         dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2053         dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2054         dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2055         dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2056
2057         dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2058             &client_input_agent_open : &deny_input_open);
2059         dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2060             &x11_input_open : &deny_input_open);
2061 }
2062
2063 static void
2064 client_init_dispatch_15(void)
2065 {
2066         client_init_dispatch_13();
2067         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2068         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2069 }
2070
2071 static void
2072 client_init_dispatch(void)
2073 {
2074         if (compat20)
2075                 client_init_dispatch_20();
2076         else if (compat13)
2077                 client_init_dispatch_13();
2078         else
2079                 client_init_dispatch_15();
2080 }
2081
2082 /* client specific fatal cleanup */
2083 void
2084 cleanup_exit(int i)
2085 {
2086         leave_raw_mode();
2087         leave_non_blocking();
2088         if (options.control_path != NULL && muxserver_sock != -1)
2089                 unlink(options.control_path);
2090         _exit(i);
2091 }