clientloop.c

   1 /*
   2  * Author: Tatu Ylonen <ylo@cs.hut.fi>
   3  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   4  *                    All rights reserved
   5  * The main loop for the interactive session (client side).
   6  *
   7  * As far as I am concerned, the code I have written for this software
   8  * can be used freely for any purpose.  Any derived versions of this
   9  * software must be clearly marked as such, and if the derived work is
  10  * incompatible with the protocol description in the RFC file, it must be
  11  * called by a name other than "ssh" or "Secure Shell".
  12  *
  13  *
  14  * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
  15  *
  16  * Redistribution and use in source and binary forms, with or without
  17  * modification, are permitted provided that the following conditions
  18  * are met:
  19  * 1. Redistributions of source code must retain the above copyright
  20  *    notice, this list of conditions and the following disclaimer.
  21  * 2. Redistributions in binary form must reproduce the above copyright
  22  *    notice, this list of conditions and the following disclaimer in the
  23  *    documentation and/or other materials provided with the distribution.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  26  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  28  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  29  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  34  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  *
  36  *
  37  * SSH2 support added by Markus Friedl.
  38  * Copyright (c) 1999, 2000, 2001 Markus Friedl.  All rights reserved.
  39  *
  40  * Redistribution and use in source and binary forms, with or without
  41  * modification, are permitted provided that the following conditions
  42  * are met:
  43  * 1. Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  * 2. Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in the
  47  *    documentation and/or other materials provided with the distribution.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  50  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  51  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  52  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  53  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  54  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  55  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  56  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  57  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  58  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  59  */
  60
  61 #include "includes.h"
  62 RCSID("$OpenBSD: clientloop.c,v 1.154 2006/02/20 17:19:54 stevesk Exp $");
  63
  64 #include <sys/types.h>
  65 #ifdef HAVE_SYS_STAT_H
  66 # include <sys/stat.h>
  67 #endif
  68 #include <sys/ioctl.h>
  69
  70 #include <paths.h>
  71 #include <signal.h>
  72 #include <termios.h>
  73
  74 #include "ssh.h"
  75 #include "ssh1.h"
  76 #include "ssh2.h"
  77 #include "xmalloc.h"
  78 #include "packet.h"
  79 #include "buffer.h"
  80 #include "compat.h"
  81 #include "channels.h"
  82 #include "dispatch.h"
  83 #include "buffer.h"
  84 #include "bufaux.h"
  85 #include "key.h"
  86 #include "kex.h"
  87 #include "log.h"
  88 #include "readconf.h"
  89 #include "clientloop.h"
  90 #include "sshconnect.h"
  91 #include "authfd.h"
  92 #include "atomicio.h"
  93 #include "sshpty.h"
  94 #include "misc.h"
  95 #include "monitor_fdpass.h"
  96 #include "match.h"
  97 #include "msg.h"
  98
  99 /* import options */
 100 extern Options options;
 101
 102 /* Flag indicating that stdin should be redirected from /dev/null. */
 103 extern int stdin_null_flag;
 104
 105 /* Flag indicating that no shell has been requested */
 106 extern int no_shell_flag;
 107
 108 /* Control socket */
 109 extern int control_fd;
 110
 111 /*
 112  * Name of the host we are connecting to.  This is the name given on the
 113  * command line, or the HostName specified for the user-supplied name in a
 114  * configuration file.
 115  */
 116 extern char *host;
 117
 118 /*
 119  * Flag to indicate that we have received a window change signal which has
 120  * not yet been processed.  This will cause a message indicating the new
 121  * window size to be sent to the server a little later.  This is volatile
 122  * because this is updated in a signal handler.
 123  */
 124 static volatile sig_atomic_t received_window_change_signal = 0;
 125 static volatile sig_atomic_t received_signal = 0;
 126
 127 /* Flag indicating whether the user's terminal is in non-blocking mode. */
 128 static int in_non_blocking_mode = 0;
 129
 130 /* Common data for the client loop code. */
 131 static int quit_pending;        /* Set to non-zero to quit the client loop. */
 132 static int escape_char;         /* Escape character. */
 133 static int escape_pending;      /* Last character was the escape character */
 134 static int last_was_cr;         /* Last character was a newline. */
 135 static int exit_status;         /* Used to store the exit status of the command. */
 136 static int stdin_eof;           /* EOF has been encountered on standard error. */
 137 static Buffer stdin_buffer;     /* Buffer for stdin data. */
 138 static Buffer stdout_buffer;    /* Buffer for stdout data. */
 139 static Buffer stderr_buffer;    /* Buffer for stderr data. */
 140 static u_long stdin_bytes, stdout_bytes, stderr_bytes;
 141 static u_int buffer_high;/* Soft max buffer size. */
 142 static int connection_in;       /* Connection to server (input). */
 143 static int connection_out;      /* Connection to server (output). */
 144 static int need_rekeying;       /* Set to non-zero if rekeying is requested. */
 145 static int session_closed = 0;  /* In SSH2: login session closed. */
 146 static int server_alive_timeouts = 0;
 147
 148 static void client_init_dispatch(void);
 149 int     session_ident = -1;
 150
 151 struct confirm_ctx {
 152         int want_tty;
 153         int want_subsys;
 154         int want_x_fwd;
 155         int want_agent_fwd;
 156         Buffer cmd;
 157         char *term;
 158         struct termios tio;
 159         char **env;
 160 };
 161
 162 /*XXX*/
 163 extern Kex *xxx_kex;
 164
 165 void ssh_process_session2_setup(int, int, int, Buffer *);
 166
 167 /* Restores stdin to blocking mode. */
 168
 169 static void
 170 leave_non_blocking(void)
 171 {
 172         if (in_non_blocking_mode) {
 173                 unset_nonblock(fileno(stdin));
 174                 in_non_blocking_mode = 0;
 175         }
 176 }
 177
 178 /* Puts stdin terminal in non-blocking mode. */
 179
 180 static void
 181 enter_non_blocking(void)
 182 {
 183         in_non_blocking_mode = 1;
 184         set_nonblock(fileno(stdin));
 185 }
 186
 187 /*
 188  * Signal handler for the window change signal (SIGWINCH).  This just sets a
 189  * flag indicating that the window has changed.
 190  */
 191
 192 static void
 193 window_change_handler(int sig)
 194 {
 195         received_window_change_signal = 1;
 196         signal(SIGWINCH, window_change_handler);
 197 }
 198
 199 /*
 200  * Signal handler for signals that cause the program to terminate.  These
 201  * signals must be trapped to restore terminal modes.
 202  */
 203
 204 static void
 205 signal_handler(int sig)
 206 {
 207         received_signal = sig;
 208         quit_pending = 1;
 209 }
 210
 211 /*
 212  * Returns current time in seconds from Jan 1, 1970 with the maximum
 213  * available resolution.
 214  */
 215
 216 static double
 217 get_current_time(void)
 218 {
 219         struct timeval tv;
 220         gettimeofday(&tv, NULL);
 221         return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
 222 }
 223
 224 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
 225 void
 226 client_x11_get_proto(const char *display, const char *xauth_path,
 227     u_int trusted, char **_proto, char **_data)
 228 {
 229         char cmd[1024];
 230         char line[512];
 231         char xdisplay[512];
 232         static char proto[512], data[512];
 233         FILE *f;
 234         int got_data = 0, generated = 0, do_unlink = 0, i;
 235         char *xauthdir, *xauthfile;
 236         struct stat st;
 237
 238         xauthdir = xauthfile = NULL;
 239         *_proto = proto;
 240         *_data = data;
 241         proto[0] = data[0] = '\0';
 242
 243         if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
 244                 debug("No xauth program.");
 245         } else {
 246                 if (display == NULL) {
 247                         debug("x11_get_proto: DISPLAY not set");
 248                         return;
 249                 }
 250                 /*
 251                  * Handle FamilyLocal case where $DISPLAY does
 252                  * not match an authorization entry.  For this we
 253                  * just try "xauth list unix:displaynum.screennum".
 254                  * XXX: "localhost" match to determine FamilyLocal
 255                  *      is not perfect.
 256                  */
 257                 if (strncmp(display, "localhost:", 10) == 0) {
 258                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
 259                             display + 10);
 260                         display = xdisplay;
 261                 }
 262                 if (trusted == 0) {
 263                         xauthdir = xmalloc(MAXPATHLEN);
 264                         xauthfile = xmalloc(MAXPATHLEN);
 265                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
 266                         if (mkdtemp(xauthdir) != NULL) {
 267                                 do_unlink = 1;
 268                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
 269                                     xauthdir);
 270                                 snprintf(cmd, sizeof(cmd),
 271                                     "%s -f %s generate %s " SSH_X11_PROTO
 272                                     " untrusted timeout 1200 2>" _PATH_DEVNULL,
 273                                     xauth_path, xauthfile, display);
 274                                 debug2("x11_get_proto: %s", cmd);
 275                                 if (system(cmd) == 0)
 276                                         generated = 1;
 277                         }
 278                 }
 279                 snprintf(cmd, sizeof(cmd),
 280                     "%s %s%s list %s 2>" _PATH_DEVNULL,
 281                     xauth_path,
 282                     generated ? "-f " : "" ,
 283                     generated ? xauthfile : "",
 284                     display);
 285                 debug2("x11_get_proto: %s", cmd);
 286                 f = popen(cmd, "r");
 287                 if (f && fgets(line, sizeof(line), f) &&
 288                     sscanf(line, "%*s %511s %511s", proto, data) == 2)
 289                         got_data = 1;
 290                 if (f)
 291                         pclose(f);
 292         }
 293
 294         if (do_unlink) {
 295                 unlink(xauthfile);
 296                 rmdir(xauthdir);
 297         }
 298         if (xauthdir)
 299                 xfree(xauthdir);
 300         if (xauthfile)
 301                 xfree(xauthfile);
 302
 303         /*
 304          * If we didn't get authentication data, just make up some
 305          * data.  The forwarding code will check the validity of the
 306          * response anyway, and substitute this data.  The X11
 307          * server, however, will ignore this fake data and use
 308          * whatever authentication mechanisms it was using otherwise
 309          * for the local connection.
 310          */
 311         if (!got_data) {
 312                 u_int32_t rnd = 0;
 313
 314                 logit("Warning: No xauth data; "
 315                     "using fake authentication data for X11 forwarding.");
 316                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
 317                 for (i = 0; i < 16; i++) {
 318                         if (i % 4 == 0)
 319                                 rnd = arc4random();
 320                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
 321                             rnd & 0xff);
 322                         rnd >>= 8;
 323                 }
 324         }
 325 }
 326
 327 /*
 328  * This is called when the interactive is entered.  This checks if there is
 329  * an EOF coming on stdin.  We must check this explicitly, as select() does
 330  * not appear to wake up when redirecting from /dev/null.
 331  */
 332
 333 static void
 334 client_check_initial_eof_on_stdin(void)
 335 {
 336         int len;
 337         char buf[1];
 338
 339         /*
 340          * If standard input is to be "redirected from /dev/null", we simply
 341          * mark that we have seen an EOF and send an EOF message to the
 342          * server. Otherwise, we try to read a single character; it appears
 343          * that for some files, such /dev/null, select() never wakes up for
 344          * read for this descriptor, which means that we never get EOF.  This
 345          * way we will get the EOF if stdin comes from /dev/null or similar.
 346          */
 347         if (stdin_null_flag) {
 348                 /* Fake EOF on stdin. */
 349                 debug("Sending eof.");
 350                 stdin_eof = 1;
 351                 packet_start(SSH_CMSG_EOF);
 352                 packet_send();
 353         } else {
 354                 enter_non_blocking();
 355
 356                 /* Check for immediate EOF on stdin. */
 357                 len = read(fileno(stdin), buf, 1);
 358                 if (len == 0) {
 359                         /* EOF.  Record that we have seen it and send EOF to server. */
 360                         debug("Sending eof.");
 361                         stdin_eof = 1;
 362                         packet_start(SSH_CMSG_EOF);
 363                         packet_send();
 364                 } else if (len > 0) {
 365                         /*
 366                          * Got data.  We must store the data in the buffer,
 367                          * and also process it as an escape character if
 368                          * appropriate.
 369                          */
 370                         if ((u_char) buf[0] == escape_char)
 371                                 escape_pending = 1;
 372                         else
 373                                 buffer_append(&stdin_buffer, buf, 1);
 374                 }
 375                 leave_non_blocking();
 376         }
 377 }
 378
 379
 380 /*
 381  * Make packets from buffered stdin data, and buffer them for sending to the
 382  * connection.
 383  */
 384
 385 static void
 386 client_make_packets_from_stdin_data(void)
 387 {
 388         u_int len;
 389
 390         /* Send buffered stdin data to the server. */
 391         while (buffer_len(&stdin_buffer) > 0 &&
 392             packet_not_very_much_data_to_write()) {
 393                 len = buffer_len(&stdin_buffer);
 394                 /* Keep the packets at reasonable size. */
 395                 if (len > packet_get_maxsize())
 396                         len = packet_get_maxsize();
 397                 packet_start(SSH_CMSG_STDIN_DATA);
 398                 packet_put_string(buffer_ptr(&stdin_buffer), len);
 399                 packet_send();
 400                 buffer_consume(&stdin_buffer, len);
 401                 stdin_bytes += len;
 402                 /* If we have a pending EOF, send it now. */
 403                 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
 404                         packet_start(SSH_CMSG_EOF);
 405                         packet_send();
 406                 }
 407         }
 408 }
 409
 410 /*
 411  * Checks if the client window has changed, and sends a packet about it to
 412  * the server if so.  The actual change is detected elsewhere (by a software
 413  * interrupt on Unix); this just checks the flag and sends a message if
 414  * appropriate.
 415  */
 416
 417 static void
 418 client_check_window_change(void)
 419 {
 420         struct winsize ws;
 421
 422         if (! received_window_change_signal)
 423                 return;
 424         /** XXX race */
 425         received_window_change_signal = 0;
 426
 427         debug2("client_check_window_change: changed");
 428
 429         if (compat20) {
 430                 channel_send_window_changes();
 431         } else {
 432                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
 433                         return;
 434                 packet_start(SSH_CMSG_WINDOW_SIZE);
 435                 packet_put_int(ws.ws_row);
 436                 packet_put_int(ws.ws_col);
 437                 packet_put_int(ws.ws_xpixel);
 438                 packet_put_int(ws.ws_ypixel);
 439                 packet_send();
 440         }
 441 }
 442
 443 static void
 444 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
 445 {
 446         server_alive_timeouts = 0;
 447         client_global_request_reply_fwd(type, seq, ctxt);
 448 }
 449
 450 static void
 451 server_alive_check(void)
 452 {
 453         if (++server_alive_timeouts > options.server_alive_count_max)
 454                 packet_disconnect("Timeout, server not responding.");
 455         packet_start(SSH2_MSG_GLOBAL_REQUEST);
 456         packet_put_cstring("keepalive@openssh.com");
 457         packet_put_char(1);     /* boolean: want reply */
 458         packet_send();
 459 }
 460
 461 /*
 462  * Waits until the client can do something (some data becomes available on
 463  * one of the file descriptors).
 464  */
 465 static void
 466 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
 467     int *maxfdp, u_int *nallocp, int rekeying)
 468 {
 469         struct timeval tv, *tvp;
 470         int ret;
 471
 472         /* Add any selections by the channel mechanism. */
 473         channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
 474
 475         if (!compat20) {
 476                 /* Read from the connection, unless our buffers are full. */
 477                 if (buffer_len(&stdout_buffer) < buffer_high &&
 478                     buffer_len(&stderr_buffer) < buffer_high &&
 479                     channel_not_very_much_buffered_data())
 480                         FD_SET(connection_in, *readsetp);
 481                 /*
 482                  * Read from stdin, unless we have seen EOF or have very much
 483                  * buffered data to send to the server.
 484                  */
 485                 if (!stdin_eof && packet_not_very_much_data_to_write())
 486                         FD_SET(fileno(stdin), *readsetp);
 487
 488                 /* Select stdout/stderr if have data in buffer. */
 489                 if (buffer_len(&stdout_buffer) > 0)
 490                         FD_SET(fileno(stdout), *writesetp);
 491                 if (buffer_len(&stderr_buffer) > 0)
 492                         FD_SET(fileno(stderr), *writesetp);
 493         } else {
 494                 /* channel_prepare_select could have closed the last channel */
 495                 if (session_closed && !channel_still_open() &&
 496                     !packet_have_data_to_write()) {
 497                         /* clear mask since we did not call select() */
 498                         memset(*readsetp, 0, *nallocp);
 499                         memset(*writesetp, 0, *nallocp);
 500                         return;
 501                 } else {
 502                         FD_SET(connection_in, *readsetp);
 503                 }
 504         }
 505
 506         /* Select server connection if have data to write to the server. */
 507         if (packet_have_data_to_write())
 508                 FD_SET(connection_out, *writesetp);
 509
 510         if (control_fd != -1)
 511                 FD_SET(control_fd, *readsetp);
 512
 513         /*
 514          * Wait for something to happen.  This will suspend the process until
 515          * some selected descriptor can be read, written, or has some other
 516          * event pending.
 517          */
 518
 519         if (options.server_alive_interval == 0 || !compat20)
 520                 tvp = NULL;
 521         else {
 522                 tv.tv_sec = options.server_alive_interval;
 523                 tv.tv_usec = 0;
 524                 tvp = &tv;
 525         }
 526         ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
 527         if (ret < 0) {
 528                 char buf[100];
 529
 530                 /*
 531                  * We have to clear the select masks, because we return.
 532                  * We have to return, because the mainloop checks for the flags
 533                  * set by the signal handlers.
 534                  */
 535                 memset(*readsetp, 0, *nallocp);
 536                 memset(*writesetp, 0, *nallocp);
 537
 538                 if (errno == EINTR)
 539                         return;
 540                 /* Note: we might still have data in the buffers. */
 541                 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
 542                 buffer_append(&stderr_buffer, buf, strlen(buf));
 543                 quit_pending = 1;
 544         } else if (ret == 0)
 545                 server_alive_check();
 546 }
 547
 548 static void
 549 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
 550 {
 551         /* Flush stdout and stderr buffers. */
 552         if (buffer_len(bout) > 0)
 553                 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
 554         if (buffer_len(berr) > 0)
 555                 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
 556
 557         leave_raw_mode();
 558
 559         /*
 560          * Free (and clear) the buffer to reduce the amount of data that gets
 561          * written to swap.
 562          */
 563         buffer_free(bin);
 564         buffer_free(bout);
 565         buffer_free(berr);
 566
 567         /* Send the suspend signal to the program itself. */
 568         kill(getpid(), SIGTSTP);
 569
 570         /* Reset window sizes in case they have changed */
 571         received_window_change_signal = 1;
 572
 573         /* OK, we have been continued by the user. Reinitialize buffers. */
 574         buffer_init(bin);
 575         buffer_init(bout);
 576         buffer_init(berr);
 577
 578         enter_raw_mode();
 579 }
 580
 581 static void
 582 client_process_net_input(fd_set * readset)
 583 {
 584         int len;
 585         char buf[8192];
 586
 587         /*
 588          * Read input from the server, and add any such data to the buffer of
 589          * the packet subsystem.
 590          */
 591         if (FD_ISSET(connection_in, readset)) {
 592                 /* Read as much as possible. */
 593                 len = read(connection_in, buf, sizeof(buf));
 594                 if (len == 0) {
 595                         /* Received EOF.  The remote host has closed the connection. */
 596                         snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
 597                                  host);
 598                         buffer_append(&stderr_buffer, buf, strlen(buf));
 599                         quit_pending = 1;
 600                         return;
 601                 }
 602                 /*
 603                  * There is a kernel bug on Solaris that causes select to
 604                  * sometimes wake up even though there is no data available.
 605                  */
 606                 if (len < 0 && (errno == EAGAIN || errno == EINTR))
 607                         len = 0;
 608
 609                 if (len < 0) {
 610                         /* An error has encountered.  Perhaps there is a network problem. */
 611                         snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
 612                                  host, strerror(errno));
 613                         buffer_append(&stderr_buffer, buf, strlen(buf));
 614                         quit_pending = 1;
 615                         return;
 616                 }
 617                 packet_process_incoming(buf, len);
 618         }
 619 }
 620
 621 static void
 622 client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
 623 {
 624         int id;
 625         Channel *c;
 626
 627         id = packet_get_int();
 628         packet_check_eom();
 629
 630         if ((c = channel_lookup(id)) == NULL) {
 631                 error("%s: no channel for id %d", __func__, id);
 632                 return;
 633         }
 634
 635         if (type == SSH2_MSG_CHANNEL_SUCCESS)
 636                 debug2("Request suceeded on channel %d", id);
 637         else if (type == SSH2_MSG_CHANNEL_FAILURE) {
 638                 error("Request failed on channel %d", id);
 639                 channel_free(c);
 640         }
 641 }
 642
 643 static void
 644 client_extra_session2_setup(int id, void *arg)
 645 {
 646         struct confirm_ctx *cctx = arg;
 647         const char *display;
 648         Channel *c;
 649         int i;
 650
 651         if (cctx == NULL)
 652                 fatal("%s: cctx == NULL", __func__);
 653         if ((c = channel_lookup(id)) == NULL)
 654                 fatal("%s: no channel for id %d", __func__, id);
 655
 656         display = getenv("DISPLAY");
 657         if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
 658                 char *proto, *data;
 659                 /* Get reasonable local authentication information. */
 660                 client_x11_get_proto(display, options.xauth_location,
 661                     options.forward_x11_trusted, &proto, &data);
 662                 /* Request forwarding with authentication spoofing. */
 663                 debug("Requesting X11 forwarding with authentication spoofing.");
 664                 x11_request_forwarding_with_spoofing(id, display, proto, data);
 665                 /* XXX wait for reply */
 666         }
 667
 668         if (cctx->want_agent_fwd && options.forward_agent) {
 669                 debug("Requesting authentication agent forwarding.");
 670                 channel_request_start(id, "auth-agent-req@openssh.com", 0);
 671                 packet_send();
 672         }
 673
 674         client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
 675             cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
 676             client_subsystem_reply);
 677
 678         c->confirm_ctx = NULL;
 679         buffer_free(&cctx->cmd);
 680         xfree(cctx->term);
 681         if (cctx->env != NULL) {
 682                 for (i = 0; cctx->env[i] != NULL; i++)
 683                         xfree(cctx->env[i]);
 684                 xfree(cctx->env);
 685         }
 686         xfree(cctx);
 687 }
 688
 689 static void
 690 client_process_control(fd_set * readset)
 691 {
 692         Buffer m;
 693         Channel *c;
 694         int client_fd, new_fd[3], ver, allowed;
 695         socklen_t addrlen;
 696         struct sockaddr_storage addr;
 697         struct confirm_ctx *cctx;
 698         char *cmd;
 699         u_int i, len, env_len, command, flags;
 700         uid_t euid;
 701         gid_t egid;
 702
 703         /*
 704          * Accept connection on control socket
 705          */
 706         if (control_fd == -1 || !FD_ISSET(control_fd, readset))
 707                 return;
 708
 709         memset(&addr, 0, sizeof(addr));
 710         addrlen = sizeof(addr);
 711         if ((client_fd = accept(control_fd,
 712             (struct sockaddr*)&addr, &addrlen)) == -1) {
 713                 error("%s accept: %s", __func__, strerror(errno));
 714                 return;
 715         }
 716
 717         if (getpeereid(client_fd, &euid, &egid) < 0) {
 718                 error("%s getpeereid failed: %s", __func__, strerror(errno));
 719                 close(client_fd);
 720                 return;
 721         }
 722         if ((euid != 0) && (getuid() != euid)) {
 723                 error("control mode uid mismatch: peer euid %u != uid %u",
 724                     (u_int) euid, (u_int) getuid());
 725                 close(client_fd);
 726                 return;
 727         }
 728
 729         unset_nonblock(client_fd);
 730
 731         /* Read command */
 732         buffer_init(&m);
 733         if (ssh_msg_recv(client_fd, &m) == -1) {
 734                 error("%s: client msg_recv failed", __func__);
 735                 close(client_fd);
 736                 buffer_free(&m);
 737                 return;
 738         }
 739         if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
 740                 error("%s: wrong client version %d", __func__, ver);
 741                 buffer_free(&m);
 742                 close(client_fd);
 743                 return;
 744         }
 745
 746         allowed = 1;
 747         command = buffer_get_int(&m);
 748         flags = buffer_get_int(&m);
 749
 750         buffer_clear(&m);
 751
 752         switch (command) {
 753         case SSHMUX_COMMAND_OPEN:
 754                 if (options.control_master == SSHCTL_MASTER_ASK ||
 755                     options.control_master == SSHCTL_MASTER_AUTO_ASK)
 756                         allowed = ask_permission("Allow shared connection "
 757                             "to %s? ", host);
 758                 /* continue below */
 759                 break;
 760         case SSHMUX_COMMAND_TERMINATE:
 761                 if (options.control_master == SSHCTL_MASTER_ASK ||
 762                     options.control_master == SSHCTL_MASTER_AUTO_ASK)
 763                         allowed = ask_permission("Terminate shared connection "
 764                             "to %s? ", host);
 765                 if (allowed)
 766                         quit_pending = 1;
 767                 /* FALLTHROUGH */
 768         case SSHMUX_COMMAND_ALIVE_CHECK:
 769                 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
 770                 buffer_clear(&m);
 771                 buffer_put_int(&m, allowed);
 772                 buffer_put_int(&m, getpid());
 773                 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
 774                         error("%s: client msg_send failed", __func__);
 775                         close(client_fd);
 776                         buffer_free(&m);
 777                         return;
 778                 }
 779                 buffer_free(&m);
 780                 close(client_fd);
 781                 return;
 782         default:
 783                 error("Unsupported command %d", command);
 784                 buffer_free(&m);
 785                 close(client_fd);
 786                 return;
 787         }
 788
 789         /* Reply for SSHMUX_COMMAND_OPEN */
 790         buffer_clear(&m);
 791         buffer_put_int(&m, allowed);
 792         buffer_put_int(&m, getpid());
 793         if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
 794                 error("%s: client msg_send failed", __func__);
 795                 close(client_fd);
 796                 buffer_free(&m);
 797                 return;
 798         }
 799
 800         if (!allowed) {
 801                 error("Refused control connection");
 802                 close(client_fd);
 803                 buffer_free(&m);
 804                 return;
 805         }
 806
 807         buffer_clear(&m);
 808         if (ssh_msg_recv(client_fd, &m) == -1) {
 809                 error("%s: client msg_recv failed", __func__);
 810                 close(client_fd);
 811                 buffer_free(&m);
 812                 return;
 813         }
 814         if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
 815                 error("%s: wrong client version %d", __func__, ver);
 816                 buffer_free(&m);
 817                 close(client_fd);
 818                 return;
 819         }
 820
 821         cctx = xmalloc(sizeof(*cctx));
 822         memset(cctx, 0, sizeof(*cctx));
 823         cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
 824         cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
 825         cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
 826         cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
 827         cctx->term = buffer_get_string(&m, &len);
 828
 829         cmd = buffer_get_string(&m, &len);
 830         buffer_init(&cctx->cmd);
 831         buffer_append(&cctx->cmd, cmd, strlen(cmd));
 832
 833         env_len = buffer_get_int(&m);
 834         env_len = MIN(env_len, 4096);
 835         debug3("%s: receiving %d env vars", __func__, env_len);
 836         if (env_len != 0) {
 837                 cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
 838                 for (i = 0; i < env_len; i++)
 839                         cctx->env[i] = buffer_get_string(&m, &len);
 840                 cctx->env[i] = NULL;
 841         }
 842
 843         debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
 844             cctx->want_tty, cctx->want_subsys, cmd);
 845
 846         /* Gather fds from client */
 847         new_fd[0] = mm_receive_fd(client_fd);
 848         new_fd[1] = mm_receive_fd(client_fd);
 849         new_fd[2] = mm_receive_fd(client_fd);
 850
 851         debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
 852             new_fd[0], new_fd[1], new_fd[2]);
 853
 854         /* Try to pick up ttymodes from client before it goes raw */
 855         if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
 856                 error("%s: tcgetattr: %s", __func__, strerror(errno));
 857
 858         /* This roundtrip is just for synchronisation of ttymodes */
 859         buffer_clear(&m);
 860         if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
 861                 error("%s: client msg_send failed", __func__);
 862                 close(client_fd);
 863                 close(new_fd[0]);
 864                 close(new_fd[1]);
 865                 close(new_fd[2]);
 866                 buffer_free(&m);
 867                 xfree(cctx->term);
 868                 if (env_len != 0) {
 869                         for (i = 0; i < env_len; i++)
 870                                 xfree(cctx->env[i]);
 871                         xfree(cctx->env);
 872                 }
 873                 return;
 874         }
 875         buffer_free(&m);
 876
 877         /* enable nonblocking unless tty */
 878         if (!isatty(new_fd[0]))
 879                 set_nonblock(new_fd[0]);
 880         if (!isatty(new_fd[1]))
 881                 set_nonblock(new_fd[1]);
 882         if (!isatty(new_fd[2]))
 883                 set_nonblock(new_fd[2]);
 884
 885         set_nonblock(client_fd);
 886
 887         c = channel_new("session", SSH_CHANNEL_OPENING,
 888             new_fd[0], new_fd[1], new_fd[2],
 889             CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
 890             CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
 891
 892         /* XXX */
 893         c->ctl_fd = client_fd;
 894
 895         debug3("%s: channel_new: %d", __func__, c->self);
 896
 897         channel_send_open(c->self);
 898         channel_register_confirm(c->self, client_extra_session2_setup, cctx);
 899 }
 900
 901 static void
 902 process_cmdline(void)
 903 {
 904         void (*handler)(int);
 905         char *s, *cmd, *cancel_host;
 906         int delete = 0;
 907         int local = 0;
 908         u_short cancel_port;
 909         Forward fwd;
 910
 911         leave_raw_mode();
 912         handler = signal(SIGINT, SIG_IGN);
 913         cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
 914         if (s == NULL)
 915                 goto out;
 916         while (*s && isspace(*s))
 917                 s++;
 918         if (*s == '-')
 919                 s++;    /* Skip cmdline '-', if any */
 920         if (*s == '\0')
 921                 goto out;
 922
 923         if (*s == 'h' || *s == 'H' || *s == '?') {
 924                 logit("Commands:");
 925                 logit("      -Lport:host:hostport    Request local forward");
 926                 logit("      -Rport:host:hostport    Request remote forward");
 927                 logit("      -KRhostport             Cancel remote forward");
 928                 if (!options.permit_local_command)
 929                         goto out;
 930                 logit("      !args                   Execute local command");
 931                 goto out;
 932         }
 933
 934         if (*s == '!' && options.permit_local_command) {
 935                 s++;
 936                 ssh_local_cmd(s);
 937                 goto out;
 938         }
 939
 940         if (*s == 'K') {
 941                 delete = 1;
 942                 s++;
 943         }
 944         if (*s != 'L' && *s != 'R') {
 945                 logit("Invalid command.");
 946                 goto out;
 947         }
 948         if (*s == 'L')
 949                 local = 1;
 950         if (local && delete) {
 951                 logit("Not supported.");
 952                 goto out;
 953         }
 954         if ((!local || delete) && !compat20) {
 955                 logit("Not supported for SSH protocol version 1.");
 956                 goto out;
 957         }
 958
 959         s++;
 960         while (*s && isspace(*s))
 961                 s++;
 962
 963         if (delete) {
 964                 cancel_port = 0;
 965                 cancel_host = hpdelim(&s);      /* may be NULL */
 966                 if (s != NULL) {
 967                         cancel_port = a2port(s);
 968                         cancel_host = cleanhostname(cancel_host);
 969                 } else {
 970                         cancel_port = a2port(cancel_host);
 971                         cancel_host = NULL;
 972                 }
 973                 if (cancel_port == 0) {
 974                         logit("Bad forwarding close port");
 975                         goto out;
 976                 }
 977                 channel_request_rforward_cancel(cancel_host, cancel_port);
 978         } else {
 979                 if (!parse_forward(&fwd, s)) {
 980                         logit("Bad forwarding specification.");
 981                         goto out;
 982                 }
 983                 if (local) {
 984                         if (channel_setup_local_fwd_listener(fwd.listen_host,
 985                             fwd.listen_port, fwd.connect_host,
 986                             fwd.connect_port, options.gateway_ports) < 0) {
 987                                 logit("Port forwarding failed.");
 988                                 goto out;
 989                         }
 990                 } else {
 991                         channel_request_remote_forwarding(fwd.listen_host,
 992                             fwd.listen_port, fwd.connect_host,
 993                             fwd.connect_port);
 994                 }
 995
 996                 logit("Forwarding port.");
 997         }
 998
 999 out:
1000         signal(SIGINT, handler);
1001         enter_raw_mode();
1002         if (cmd)
1003                 xfree(cmd);
1004 }
1005
1006 /* process the characters one by one */
1007 static int
1008 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1009 {
1010         char string[1024];
1011         pid_t pid;
1012         int bytes = 0;
1013         u_int i;
1014         u_char ch;
1015         char *s;
1016
1017         if (len <= 0)
1018                 return (0);
1019
1020         for (i = 0; i < (u_int)len; i++) {
1021                 /* Get one character at a time. */
1022                 ch = buf[i];
1023
1024                 if (escape_pending) {
1025                         /* We have previously seen an escape character. */
1026                         /* Clear the flag now. */
1027                         escape_pending = 0;
1028
1029                         /* Process the escaped character. */
1030                         switch (ch) {
1031                         case '.':
1032                                 /* Terminate the connection. */
1033                                 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1034                                 buffer_append(berr, string, strlen(string));
1035
1036                                 quit_pending = 1;
1037                                 return -1;
1038
1039                         case 'Z' - 64:
1040                                 /* Suspend the program. */
1041                                 /* Print a message to that effect to the user. */
1042                                 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1043                                 buffer_append(berr, string, strlen(string));
1044
1045                                 /* Restore terminal modes and suspend. */
1046                                 client_suspend_self(bin, bout, berr);
1047
1048                                 /* We have been continued. */
1049                                 continue;
1050
1051                         case 'B':
1052                                 if (compat20) {
1053                                         snprintf(string, sizeof string,
1054                                             "%cB\r\n", escape_char);
1055                                         buffer_append(berr, string,
1056                                             strlen(string));
1057                                         channel_request_start(session_ident,
1058                                             "break", 0);
1059                                         packet_put_int(1000);
1060                                         packet_send();
1061                                 }
1062                                 continue;
1063
1064                         case 'R':
1065                                 if (compat20) {
1066                                         if (datafellows & SSH_BUG_NOREKEY)
1067                                                 logit("Server does not support re-keying");
1068                                         else
1069                                                 need_rekeying = 1;
1070                                 }
1071                                 continue;
1072
1073                         case '&':
1074                                 /*
1075                                  * Detach the program (continue to serve connections,
1076                                  * but put in background and no more new connections).
1077                                  */
1078                                 /* Restore tty modes. */
1079                                 leave_raw_mode();
1080
1081                                 /* Stop listening for new connections. */
1082                                 channel_stop_listening();
1083
1084                                 snprintf(string, sizeof string,
1085                                     "%c& [backgrounded]\n", escape_char);
1086                                 buffer_append(berr, string, strlen(string));
1087
1088                                 /* Fork into background. */
1089                                 pid = fork();
1090                                 if (pid < 0) {
1091                                         error("fork: %.100s", strerror(errno));
1092                                         continue;
1093                                 }
1094                                 if (pid != 0) { /* This is the parent. */
1095                                         /* The parent just exits. */
1096                                         exit(0);
1097                                 }
1098                                 /* The child continues serving connections. */
1099                                 if (compat20) {
1100                                         buffer_append(bin, "\004", 1);
1101                                         /* fake EOF on stdin */
1102                                         return -1;
1103                                 } else if (!stdin_eof) {
1104                                         /*
1105                                          * Sending SSH_CMSG_EOF alone does not always appear
1106                                          * to be enough.  So we try to send an EOF character
1107                                          * first.
1108                                          */
1109                                         packet_start(SSH_CMSG_STDIN_DATA);
1110                                         packet_put_string("\004", 1);
1111                                         packet_send();
1112                                         /* Close stdin. */
1113                                         stdin_eof = 1;
1114                                         if (buffer_len(bin) == 0) {
1115                                                 packet_start(SSH_CMSG_EOF);
1116                                                 packet_send();
1117                                         }
1118                                 }
1119                                 continue;
1120
1121                         case '?':
1122                                 snprintf(string, sizeof string,
1123 "%c?\r\n\
1124 Supported escape sequences:\r\n\
1125 %c.  - terminate connection\r\n\
1126 %cB  - send a BREAK to the remote system\r\n\
1127 %cC  - open a command line\r\n\
1128 %cR  - Request rekey (SSH protocol 2 only)\r\n\
1129 %c^Z - suspend ssh\r\n\
1130 %c#  - list forwarded connections\r\n\
1131 %c&  - background ssh (when waiting for connections to terminate)\r\n\
1132 %c?  - this message\r\n\
1133 %c%c  - send the escape character by typing it twice\r\n\
1134 (Note that escapes are only recognized immediately after newline.)\r\n",
1135                                     escape_char, escape_char, escape_char, escape_char,
1136                                     escape_char, escape_char, escape_char, escape_char,
1137                                     escape_char, escape_char, escape_char);
1138                                 buffer_append(berr, string, strlen(string));
1139                                 continue;
1140
1141                         case '#':
1142                                 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1143                                 buffer_append(berr, string, strlen(string));
1144                                 s = channel_open_message();
1145                                 buffer_append(berr, s, strlen(s));
1146                                 xfree(s);
1147                                 continue;
1148
1149                         case 'C':
1150                                 process_cmdline();
1151                                 continue;
1152
1153                         default:
1154                                 if (ch != escape_char) {
1155                                         buffer_put_char(bin, escape_char);
1156                                         bytes++;
1157                                 }
1158                                 /* Escaped characters fall through here */
1159                                 break;
1160                         }
1161                 } else {
1162                         /*
1163                          * The previous character was not an escape char. Check if this
1164                          * is an escape.
1165                          */
1166                         if (last_was_cr && ch == escape_char) {
1167                                 /* It is. Set the flag and continue to next character. */
1168                                 escape_pending = 1;
1169                                 continue;
1170                         }
1171                 }
1172
1173                 /*
1174                  * Normal character.  Record whether it was a newline,
1175                  * and append it to the buffer.
1176                  */
1177                 last_was_cr = (ch == '\r' || ch == '\n');
1178                 buffer_put_char(bin, ch);
1179                 bytes++;
1180         }
1181         return bytes;
1182 }
1183
1184 static void
1185 client_process_input(fd_set * readset)
1186 {
1187         int len;
1188         char buf[8192];
1189
1190         /* Read input from stdin. */
1191         if (FD_ISSET(fileno(stdin), readset)) {
1192                 /* Read as much as possible. */
1193                 len = read(fileno(stdin), buf, sizeof(buf));
1194                 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1195                         return;         /* we'll try again later */
1196                 if (len <= 0) {
1197                         /*
1198                          * Received EOF or error.  They are treated
1199                          * similarly, except that an error message is printed
1200                          * if it was an error condition.
1201                          */
1202                         if (len < 0) {
1203                                 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1204                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1205                         }
1206                         /* Mark that we have seen EOF. */
1207                         stdin_eof = 1;
1208                         /*
1209                          * Send an EOF message to the server unless there is
1210                          * data in the buffer.  If there is data in the
1211                          * buffer, no message will be sent now.  Code
1212                          * elsewhere will send the EOF when the buffer
1213                          * becomes empty if stdin_eof is set.
1214                          */
1215                         if (buffer_len(&stdin_buffer) == 0) {
1216                                 packet_start(SSH_CMSG_EOF);
1217                                 packet_send();
1218                         }
1219                 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1220                         /*
1221                          * Normal successful read, and no escape character.
1222                          * Just append the data to buffer.
1223                          */
1224                         buffer_append(&stdin_buffer, buf, len);
1225                 } else {
1226                         /*
1227                          * Normal, successful read.  But we have an escape character
1228                          * and have to process the characters one by one.
1229                          */
1230                         if (process_escapes(&stdin_buffer, &stdout_buffer,
1231                             &stderr_buffer, buf, len) == -1)
1232                                 return;
1233                 }
1234         }
1235 }
1236
1237 static void
1238 client_process_output(fd_set * writeset)
1239 {
1240         int len;
1241         char buf[100];
1242
1243         /* Write buffered output to stdout. */
1244         if (FD_ISSET(fileno(stdout), writeset)) {
1245                 /* Write as much data as possible. */
1246                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1247                     buffer_len(&stdout_buffer));
1248                 if (len <= 0) {
1249                         if (errno == EINTR || errno == EAGAIN)
1250                                 len = 0;
1251                         else {
1252                                 /*
1253                                  * An error or EOF was encountered.  Put an
1254                                  * error message to stderr buffer.
1255                                  */
1256                                 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1257                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1258                                 quit_pending = 1;
1259                                 return;
1260                         }
1261                 }
1262                 /* Consume printed data from the buffer. */
1263                 buffer_consume(&stdout_buffer, len);
1264                 stdout_bytes += len;
1265         }
1266         /* Write buffered output to stderr. */
1267         if (FD_ISSET(fileno(stderr), writeset)) {
1268                 /* Write as much data as possible. */
1269                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1270                     buffer_len(&stderr_buffer));
1271                 if (len <= 0) {
1272                         if (errno == EINTR || errno == EAGAIN)
1273                                 len = 0;
1274                         else {
1275                                 /* EOF or error, but can't even print error message. */
1276                                 quit_pending = 1;
1277                                 return;
1278                         }
1279                 }
1280                 /* Consume printed characters from the buffer. */
1281                 buffer_consume(&stderr_buffer, len);
1282                 stderr_bytes += len;
1283         }
1284 }
1285
1286 /*
1287  * Get packets from the connection input buffer, and process them as long as
1288  * there are packets available.
1289  *
1290  * Any unknown packets received during the actual
1291  * session cause the session to terminate.  This is
1292  * intended to make debugging easier since no
1293  * confirmations are sent.  Any compatible protocol
1294  * extensions must be negotiated during the
1295  * preparatory phase.
1296  */
1297
1298 static void
1299 client_process_buffered_input_packets(void)
1300 {
1301         dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1302 }
1303
1304 /* scan buf[] for '~' before sending data to the peer */
1305
1306 static int
1307 simple_escape_filter(Channel *c, char *buf, int len)
1308 {
1309         /* XXX we assume c->extended is writeable */
1310         return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1311 }
1312
1313 static void
1314 client_channel_closed(int id, void *arg)
1315 {
1316         channel_cancel_cleanup(id);
1317         session_closed = 1;
1318         leave_raw_mode();
1319 }
1320
1321 /*
1322  * Implements the interactive session with the server.  This is called after
1323  * the user has been authenticated, and a command has been started on the
1324  * remote host.  If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1325  * used as an escape character for terminating or suspending the session.
1326  */
1327
1328 int
1329 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1330 {
1331         fd_set *readset = NULL, *writeset = NULL;
1332         double start_time, total_time;
1333         int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1334         u_int nalloc = 0;
1335         char buf[100];
1336
1337         debug("Entering interactive session.");
1338
1339         start_time = get_current_time();
1340
1341         /* Initialize variables. */
1342         escape_pending = 0;
1343         last_was_cr = 1;
1344         exit_status = -1;
1345         stdin_eof = 0;
1346         buffer_high = 64 * 1024;
1347         connection_in = packet_get_connection_in();
1348         connection_out = packet_get_connection_out();
1349         max_fd = MAX(connection_in, connection_out);
1350         if (control_fd != -1)
1351                 max_fd = MAX(max_fd, control_fd);
1352
1353         if (!compat20) {
1354                 /* enable nonblocking unless tty */
1355                 if (!isatty(fileno(stdin)))
1356                         set_nonblock(fileno(stdin));
1357                 if (!isatty(fileno(stdout)))
1358                         set_nonblock(fileno(stdout));
1359                 if (!isatty(fileno(stderr)))
1360                         set_nonblock(fileno(stderr));
1361                 max_fd = MAX(max_fd, fileno(stdin));
1362                 max_fd = MAX(max_fd, fileno(stdout));
1363                 max_fd = MAX(max_fd, fileno(stderr));
1364         }
1365         stdin_bytes = 0;
1366         stdout_bytes = 0;
1367         stderr_bytes = 0;
1368         quit_pending = 0;
1369         escape_char = escape_char_arg;
1370
1371         /* Initialize buffers. */
1372         buffer_init(&stdin_buffer);
1373         buffer_init(&stdout_buffer);
1374         buffer_init(&stderr_buffer);
1375
1376         client_init_dispatch();
1377
1378         /*
1379          * Set signal handlers, (e.g. to restore non-blocking mode)
1380          * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1381          */
1382         if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1383                 signal(SIGHUP, signal_handler);
1384         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1385                 signal(SIGINT, signal_handler);
1386         if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1387                 signal(SIGQUIT, signal_handler);
1388         if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1389                 signal(SIGTERM, signal_handler);
1390         signal(SIGWINCH, window_change_handler);
1391
1392         if (have_pty)
1393                 enter_raw_mode();
1394
1395         if (compat20) {
1396                 session_ident = ssh2_chan_id;
1397                 if (escape_char != SSH_ESCAPECHAR_NONE)
1398                         channel_register_filter(session_ident,
1399                             simple_escape_filter, NULL);
1400                 if (session_ident != -1)
1401                         channel_register_cleanup(session_ident,
1402                             client_channel_closed, 0);
1403         } else {
1404                 /* Check if we should immediately send eof on stdin. */
1405                 client_check_initial_eof_on_stdin();
1406         }
1407
1408         /* Main loop of the client for the interactive session mode. */
1409         while (!quit_pending) {
1410
1411                 /* Process buffered packets sent by the server. */
1412                 client_process_buffered_input_packets();
1413
1414                 if (compat20 && session_closed && !channel_still_open())
1415                         break;
1416
1417                 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1418
1419                 if (rekeying) {
1420                         debug("rekeying in progress");
1421                 } else {
1422                         /*
1423                          * Make packets of buffered stdin data, and buffer
1424                          * them for sending to the server.
1425                          */
1426                         if (!compat20)
1427                                 client_make_packets_from_stdin_data();
1428
1429                         /*
1430                          * Make packets from buffered channel data, and
1431                          * enqueue them for sending to the server.
1432                          */
1433                         if (packet_not_very_much_data_to_write())
1434                                 channel_output_poll();
1435
1436                         /*
1437                          * Check if the window size has changed, and buffer a
1438                          * message about it to the server if so.
1439                          */
1440                         client_check_window_change();
1441
1442                         if (quit_pending)
1443                                 break;
1444                 }
1445                 /*
1446                  * Wait until we have something to do (something becomes
1447                  * available on one of the descriptors).
1448                  */
1449                 max_fd2 = max_fd;
1450                 client_wait_until_can_do_something(&readset, &writeset,
1451                     &max_fd2, &nalloc, rekeying);
1452
1453                 if (quit_pending)
1454                         break;
1455
1456                 /* Do channel operations unless rekeying in progress. */
1457                 if (!rekeying) {
1458                         channel_after_select(readset, writeset);
1459                         if (need_rekeying || packet_need_rekeying()) {
1460                                 debug("need rekeying");
1461                                 xxx_kex->done = 0;
1462                                 kex_send_kexinit(xxx_kex);
1463                                 need_rekeying = 0;
1464                         }
1465                 }
1466
1467                 /* Buffer input from the connection.  */
1468                 client_process_net_input(readset);
1469
1470                 /* Accept control connections.  */
1471                 client_process_control(readset);
1472
1473                 if (quit_pending)
1474                         break;
1475
1476                 if (!compat20) {
1477                         /* Buffer data from stdin */
1478                         client_process_input(readset);
1479                         /*
1480                          * Process output to stdout and stderr.  Output to
1481                          * the connection is processed elsewhere (above).
1482                          */
1483                         client_process_output(writeset);
1484                 }
1485
1486                 /* Send as much buffered packet data as possible to the sender. */
1487                 if (FD_ISSET(connection_out, writeset))
1488                         packet_write_poll();
1489         }
1490         if (readset)
1491                 xfree(readset);
1492         if (writeset)
1493                 xfree(writeset);
1494
1495         /* Terminate the session. */
1496
1497         /* Stop watching for window change. */
1498         signal(SIGWINCH, SIG_DFL);
1499
1500         channel_free_all();
1501
1502         if (have_pty)
1503                 leave_raw_mode();
1504
1505         /* restore blocking io */
1506         if (!isatty(fileno(stdin)))
1507                 unset_nonblock(fileno(stdin));
1508         if (!isatty(fileno(stdout)))
1509                 unset_nonblock(fileno(stdout));
1510         if (!isatty(fileno(stderr)))
1511                 unset_nonblock(fileno(stderr));
1512
1513         /*
1514          * If there was no shell or command requested, there will be no remote
1515          * exit status to be returned.  In that case, clear error code if the
1516          * connection was deliberately terminated at this end.
1517          */
1518         if (no_shell_flag && received_signal == SIGTERM) {
1519                 received_signal = 0;
1520                 exit_status = 0;
1521         }
1522
1523         if (received_signal)
1524                 fatal("Killed by signal %d.", (int) received_signal);
1525
1526         /*
1527          * In interactive mode (with pseudo tty) display a message indicating
1528          * that the connection has been closed.
1529          */
1530         if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1531                 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1532                 buffer_append(&stderr_buffer, buf, strlen(buf));
1533         }
1534
1535         /* Output any buffered data for stdout. */
1536         while (buffer_len(&stdout_buffer) > 0) {
1537                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1538                     buffer_len(&stdout_buffer));
1539                 if (len <= 0) {
1540                         error("Write failed flushing stdout buffer.");
1541                         break;
1542                 }
1543                 buffer_consume(&stdout_buffer, len);
1544                 stdout_bytes += len;
1545         }
1546
1547         /* Output any buffered data for stderr. */
1548         while (buffer_len(&stderr_buffer) > 0) {
1549                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1550                     buffer_len(&stderr_buffer));
1551                 if (len <= 0) {
1552                         error("Write failed flushing stderr buffer.");
1553                         break;
1554                 }
1555                 buffer_consume(&stderr_buffer, len);
1556                 stderr_bytes += 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         debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1568             stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1569         if (total_time > 0)
1570                 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1571                     stdin_bytes / total_time, stdout_bytes / total_time,
1572                     stderr_bytes / total_time);
1573
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         int listen_port, originator_port;
1664         int sock;
1665
1666         /* Get rest of the packet */
1667         listen_address = packet_get_string(NULL);
1668         listen_port = packet_get_int();
1669         originator_address = packet_get_string(NULL);
1670         originator_port = packet_get_int();
1671         packet_check_eom();
1672
1673         debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1674             listen_address, listen_port, originator_address, originator_port);
1675
1676         sock = channel_connect_by_listen_address(listen_port);
1677         if (sock < 0) {
1678                 xfree(originator_address);
1679                 xfree(listen_address);
1680                 return NULL;
1681         }
1682         c = channel_new("forwarded-tcpip",
1683             SSH_CHANNEL_CONNECTING, sock, sock, -1,
1684             CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1685             originator_address, 1);
1686         xfree(originator_address);
1687         xfree(listen_address);
1688         return c;
1689 }
1690
1691 static Channel *
1692 client_request_x11(const char *request_type, int rchan)
1693 {
1694         Channel *c = NULL;
1695         char *originator;
1696         int originator_port;
1697         int sock;
1698
1699         if (!options.forward_x11) {
1700                 error("Warning: ssh server tried X11 forwarding.");
1701                 error("Warning: this is probably a break-in attempt by a malicious server.");
1702                 return NULL;
1703         }
1704         originator = packet_get_string(NULL);
1705         if (datafellows & SSH_BUG_X11FWD) {
1706                 debug2("buggy server: x11 request w/o originator_port");
1707                 originator_port = 0;
1708         } else {
1709                 originator_port = packet_get_int();
1710         }
1711         packet_check_eom();
1712         /* XXX check permission */
1713         debug("client_request_x11: request from %s %d", originator,
1714             originator_port);
1715         xfree(originator);
1716         sock = x11_connect_display();
1717         if (sock < 0)
1718                 return NULL;
1719         c = channel_new("x11",
1720             SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1721             CHAN_TCP_WINDOW_DEFAULT, 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 malicious server.");
1735                 return NULL;
1736         }
1737         sock =  ssh_get_authentication_socket();
1738         if (sock < 0)
1739                 return NULL;
1740         c = channel_new("authentication agent connection",
1741             SSH_CHANNEL_OPEN, sock, sock, -1,
1742             CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1743             "authentication agent connection", 1);
1744         c->force_drain = 1;
1745         return c;
1746 }
1747
1748 /* XXXX move to generic input handler */
1749 static void
1750 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1751 {
1752         Channel *c = NULL;
1753         char *ctype;
1754         int rchan;
1755         u_int rmaxpack, rwindow, len;
1756
1757         ctype = packet_get_string(&len);
1758         rchan = packet_get_int();
1759         rwindow = packet_get_int();
1760         rmaxpack = packet_get_int();
1761
1762         debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1763             ctype, rchan, rwindow, rmaxpack);
1764
1765         if (strcmp(ctype, "forwarded-tcpip") == 0) {
1766                 c = client_request_forwarded_tcpip(ctype, rchan);
1767         } else if (strcmp(ctype, "x11") == 0) {
1768                 c = client_request_x11(ctype, rchan);
1769         } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1770                 c = client_request_agent(ctype, rchan);
1771         }
1772 /* XXX duplicate : */
1773         if (c != NULL) {
1774                 debug("confirm %s", ctype);
1775                 c->remote_id = rchan;
1776                 c->remote_window = rwindow;
1777                 c->remote_maxpacket = rmaxpack;
1778                 if (c->type != SSH_CHANNEL_CONNECTING) {
1779                         packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1780                         packet_put_int(c->remote_id);
1781                         packet_put_int(c->self);
1782                         packet_put_int(c->local_window);
1783                         packet_put_int(c->local_maxpacket);
1784                         packet_send();
1785                 }
1786         } else {
1787                 debug("failure %s", ctype);
1788                 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1789                 packet_put_int(rchan);
1790                 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1791                 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1792                         packet_put_cstring("open failed");
1793                         packet_put_cstring("");
1794                 }
1795                 packet_send();
1796         }
1797         xfree(ctype);
1798 }
1799 static void
1800 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1801 {
1802         Channel *c = NULL;
1803         int exitval, id, reply, success = 0;
1804         char *rtype;
1805
1806         id = packet_get_int();
1807         rtype = packet_get_string(NULL);
1808         reply = packet_get_char();
1809
1810         debug("client_input_channel_req: channel %d rtype %s reply %d",
1811             id, rtype, reply);
1812
1813         if (id == -1) {
1814                 error("client_input_channel_req: request for channel -1");
1815         } else if ((c = channel_lookup(id)) == NULL) {
1816                 error("client_input_channel_req: channel %d: unknown channel", id);
1817         } else if (strcmp(rtype, "exit-status") == 0) {
1818                 exitval = packet_get_int();
1819                 if (id == session_ident) {
1820                         success = 1;
1821                         exit_status = exitval;
1822                 } else if (c->ctl_fd == -1) {
1823                         error("client_input_channel_req: unexpected channel %d",
1824                             session_ident);
1825                 } else {
1826                         atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1827                         success = 1;
1828                 }
1829                 packet_check_eom();
1830         }
1831         if (reply) {
1832                 packet_start(success ?
1833                     SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1834                 packet_put_int(id);
1835                 packet_send();
1836         }
1837         xfree(rtype);
1838 }
1839 static void
1840 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1841 {
1842         char *rtype;
1843         int want_reply;
1844         int success = 0;
1845
1846         rtype = packet_get_string(NULL);
1847         want_reply = packet_get_char();
1848         debug("client_input_global_request: rtype %s want_reply %d",
1849             rtype, want_reply);
1850         if (want_reply) {
1851                 packet_start(success ?
1852                     SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1853                 packet_send();
1854                 packet_write_wait();
1855         }
1856         xfree(rtype);
1857 }
1858
1859 void
1860 client_session2_setup(int id, int want_tty, int want_subsystem,
1861     const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1862     dispatch_fn *subsys_repl)
1863 {
1864         int len;
1865         Channel *c = NULL;
1866
1867         debug2("%s: id %d", __func__, id);
1868
1869         if ((c = channel_lookup(id)) == NULL)
1870                 fatal("client_session2_setup: channel %d: unknown channel", id);
1871
1872         if (want_tty) {
1873                 struct winsize ws;
1874                 struct termios tio;
1875
1876                 /* Store window size in the packet. */
1877                 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1878                         memset(&ws, 0, sizeof(ws));
1879
1880                 channel_request_start(id, "pty-req", 0);
1881                 packet_put_cstring(term != NULL ? term : "");
1882                 packet_put_int(ws.ws_col);
1883                 packet_put_int(ws.ws_row);
1884                 packet_put_int(ws.ws_xpixel);
1885                 packet_put_int(ws.ws_ypixel);
1886                 tio = get_saved_tio();
1887                 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1888                 packet_send();
1889                 /* XXX wait for reply */
1890                 c->client_tty = 1;
1891         }
1892
1893         /* Transfer any environment variables from client to server */
1894         if (options.num_send_env != 0 && env != NULL) {
1895                 int i, j, matched;
1896                 char *name, *val;
1897
1898                 debug("Sending environment.");
1899                 for (i = 0; env[i] != NULL; i++) {
1900                         /* Split */
1901                         name = xstrdup(env[i]);
1902                         if ((val = strchr(name, '=')) == NULL) {
1903                                 xfree(name);
1904                                 continue;
1905                         }
1906                         *val++ = '\0';
1907
1908                         matched = 0;
1909                         for (j = 0; j < options.num_send_env; j++) {
1910                                 if (match_pattern(name, options.send_env[j])) {
1911                                         matched = 1;
1912                                         break;
1913                                 }
1914                         }
1915                         if (!matched) {
1916                                 debug3("Ignored env %s", name);
1917                                 xfree(name);
1918                                 continue;
1919                         }
1920
1921                         debug("Sending env %s = %s", name, val);
1922                         channel_request_start(id, "env", 0);
1923                         packet_put_cstring(name);
1924                         packet_put_cstring(val);
1925                         packet_send();
1926                         xfree(name);
1927                 }
1928         }
1929
1930         len = buffer_len(cmd);
1931         if (len > 0) {
1932                 if (len > 900)
1933                         len = 900;
1934                 if (want_subsystem) {
1935                         debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1936                         channel_request_start(id, "subsystem", subsys_repl != NULL);
1937                         if (subsys_repl != NULL) {
1938                                 /* register callback for reply */
1939                                 /* XXX we assume that client_loop has already been called */
1940                                 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1941                                 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1942                         }
1943                 } else {
1944                         debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1945                         channel_request_start(id, "exec", 0);
1946                 }
1947                 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1948                 packet_send();
1949         } else {
1950                 channel_request_start(id, "shell", 0);
1951                 packet_send();
1952         }
1953 }
1954
1955 static void
1956 client_init_dispatch_20(void)
1957 {
1958         dispatch_init(&dispatch_protocol_error);
1959
1960         dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1961         dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1962         dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1963         dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1964         dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1965         dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1966         dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1967         dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1968         dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1969         dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1970
1971         /* rekeying */
1972         dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1973
1974         /* global request reply messages */
1975         dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1976         dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1977 }
1978 static void
1979 client_init_dispatch_13(void)
1980 {
1981         dispatch_init(NULL);
1982         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1983         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1984         dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1985         dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1986         dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1987         dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1988         dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1989         dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1990         dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1991
1992         dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1993             &client_input_agent_open : &deny_input_open);
1994         dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1995             &x11_input_open : &deny_input_open);
1996 }
1997 static void
1998 client_init_dispatch_15(void)
1999 {
2000         client_init_dispatch_13();
2001         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2002         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2003 }
2004 static void
2005 client_init_dispatch(void)
2006 {
2007         if (compat20)
2008                 client_init_dispatch_20();
2009         else if (compat13)
2010                 client_init_dispatch_13();
2011         else
2012                 client_init_dispatch_15();
2013 }
2014
2015 /* client specific fatal cleanup */
2016 void
2017 cleanup_exit(int i)
2018 {
2019         leave_raw_mode();
2020         leave_non_blocking();
2021         if (options.control_path != NULL && control_fd != -1)
2022                 unlink(options.control_path);
2023         _exit(i);
2024 }