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
  63 #include <sys/types.h>
  64 #ifdef HAVE_SYS_STAT_H
  65 # include <sys/stat.h>
  66 #endif
  67 #include <sys/ioctl.h>
  68
  69 #include <ctype.h>
  70 #ifdef HAVE_PATHS_H
  71 #include <paths.h>
  72 #endif
  73 #include <signal.h>
  74 #include <termios.h>
  75
  76 #include "ssh.h"
  77 #include "ssh1.h"
  78 #include "ssh2.h"
  79 #include "xmalloc.h"
  80 #include "packet.h"
  81 #include "buffer.h"
  82 #include "compat.h"
  83 #include "channels.h"
  84 #include "dispatch.h"
  85 #include "buffer.h"
  86 #include "bufaux.h"
  87 #include "key.h"
  88 #include "kex.h"
  89 #include "log.h"
  90 #include "readconf.h"
  91 #include "clientloop.h"
  92 #include "sshconnect.h"
  93 #include "authfd.h"
  94 #include "atomicio.h"
  95 #include "sshpty.h"
  96 #include "misc.h"
  97 #include "monitor_fdpass.h"
  98 #include "match.h"
  99 #include "msg.h"
 100
 101 /* import options */
 102 extern Options options;
 103
 104 /* Flag indicating that stdin should be redirected from /dev/null. */
 105 extern int stdin_null_flag;
 106
 107 /* Flag indicating that no shell has been requested */
 108 extern int no_shell_flag;
 109
 110 /* Control socket */
 111 extern int control_fd;
 112
 113 /*
 114  * Name of the host we are connecting to.  This is the name given on the
 115  * command line, or the HostName specified for the user-supplied name in a
 116  * configuration file.
 117  */
 118 extern char *host;
 119
 120 /*
 121  * Flag to indicate that we have received a window change signal which has
 122  * not yet been processed.  This will cause a message indicating the new
 123  * window size to be sent to the server a little later.  This is volatile
 124  * because this is updated in a signal handler.
 125  */
 126 static volatile sig_atomic_t received_window_change_signal = 0;
 127 static volatile sig_atomic_t received_signal = 0;
 128
 129 /* Flag indicating whether the user's terminal is in non-blocking mode. */
 130 static int in_non_blocking_mode = 0;
 131
 132 /* Common data for the client loop code. */
 133 static int quit_pending;        /* Set to non-zero to quit the client loop. */
 134 static int escape_char;         /* Escape character. */
 135 static int escape_pending;      /* Last character was the escape character */
 136 static int last_was_cr;         /* Last character was a newline. */
 137 static int exit_status;         /* Used to store the exit status of the command. */
 138 static int stdin_eof;           /* EOF has been encountered on standard error. */
 139 static Buffer stdin_buffer;     /* Buffer for stdin data. */
 140 static Buffer stdout_buffer;    /* Buffer for stdout data. */
 141 static Buffer stderr_buffer;    /* Buffer for stderr data. */
 142 static u_long stdin_bytes, stdout_bytes, stderr_bytes;
 143 static u_int buffer_high;/* Soft max buffer size. */
 144 static int connection_in;       /* Connection to server (input). */
 145 static int connection_out;      /* Connection to server (output). */
 146 static int need_rekeying;       /* Set to non-zero if rekeying is requested. */
 147 static int session_closed = 0;  /* In SSH2: login session closed. */
 148 static int server_alive_timeouts = 0;
 149
 150 static void client_init_dispatch(void);
 151 int     session_ident = -1;
 152
 153 struct confirm_ctx {
 154         int want_tty;
 155         int want_subsys;
 156         int want_x_fwd;
 157         int want_agent_fwd;
 158         Buffer cmd;
 159         char *term;
 160         struct termios tio;
 161         char **env;
 162 };
 163
 164 /*XXX*/
 165 extern Kex *xxx_kex;
 166
 167 void ssh_process_session2_setup(int, int, int, Buffer *);
 168
 169 /* Restores stdin to blocking mode. */
 170
 171 static void
 172 leave_non_blocking(void)
 173 {
 174         if (in_non_blocking_mode) {
 175                 unset_nonblock(fileno(stdin));
 176                 in_non_blocking_mode = 0;
 177         }
 178 }
 179
 180 /* Puts stdin terminal in non-blocking mode. */
 181
 182 static void
 183 enter_non_blocking(void)
 184 {
 185         in_non_blocking_mode = 1;
 186         set_nonblock(fileno(stdin));
 187 }
 188
 189 /*
 190  * Signal handler for the window change signal (SIGWINCH).  This just sets a
 191  * flag indicating that the window has changed.
 192  */
 193 /*ARGSUSED */
 194 static void
 195 window_change_handler(int sig)
 196 {
 197         received_window_change_signal = 1;
 198         signal(SIGWINCH, window_change_handler);
 199 }
 200
 201 /*
 202  * Signal handler for signals that cause the program to terminate.  These
 203  * signals must be trapped to restore terminal modes.
 204  */
 205 /*ARGSUSED */
 206 static void
 207 signal_handler(int sig)
 208 {
 209         received_signal = sig;
 210         quit_pending = 1;
 211 }
 212
 213 /*
 214  * Returns current time in seconds from Jan 1, 1970 with the maximum
 215  * available resolution.
 216  */
 217
 218 static double
 219 get_current_time(void)
 220 {
 221         struct timeval tv;
 222         gettimeofday(&tv, NULL);
 223         return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
 224 }
 225
 226 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
 227 void
 228 client_x11_get_proto(const char *display, const char *xauth_path,
 229     u_int trusted, char **_proto, char **_data)
 230 {
 231         char cmd[1024];
 232         char line[512];
 233         char xdisplay[512];
 234         static char proto[512], data[512];
 235         FILE *f;
 236         int got_data = 0, generated = 0, do_unlink = 0, i;
 237         char *xauthdir, *xauthfile;
 238         struct stat st;
 239
 240         xauthdir = xauthfile = NULL;
 241         *_proto = proto;
 242         *_data = data;
 243         proto[0] = data[0] = '\0';
 244
 245         if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
 246                 debug("No xauth program.");
 247         } else {
 248                 if (display == NULL) {
 249                         debug("x11_get_proto: DISPLAY not set");
 250                         return;
 251                 }
 252                 /*
 253                  * Handle FamilyLocal case where $DISPLAY does
 254                  * not match an authorization entry.  For this we
 255                  * just try "xauth list unix:displaynum.screennum".
 256                  * XXX: "localhost" match to determine FamilyLocal
 257                  *      is not perfect.
 258                  */
 259                 if (strncmp(display, "localhost:", 10) == 0) {
 260                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
 261                             display + 10);
 262                         display = xdisplay;
 263                 }
 264                 if (trusted == 0) {
 265                         xauthdir = xmalloc(MAXPATHLEN);
 266                         xauthfile = xmalloc(MAXPATHLEN);
 267                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
 268                         if (mkdtemp(xauthdir) != NULL) {
 269                                 do_unlink = 1;
 270                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
 271                                     xauthdir);
 272                                 snprintf(cmd, sizeof(cmd),
 273                                     "%s -f %s generate %s " SSH_X11_PROTO
 274                                     " untrusted timeout 1200 2>" _PATH_DEVNULL,
 275                                     xauth_path, xauthfile, display);
 276                                 debug2("x11_get_proto: %s", cmd);
 277                                 if (system(cmd) == 0)
 278                                         generated = 1;
 279                         }
 280                 }
 281                 snprintf(cmd, sizeof(cmd),
 282                     "%s %s%s list %s 2>" _PATH_DEVNULL,
 283                     xauth_path,
 284                     generated ? "-f " : "" ,
 285                     generated ? xauthfile : "",
 286                     display);
 287                 debug2("x11_get_proto: %s", cmd);
 288                 f = popen(cmd, "r");
 289                 if (f && fgets(line, sizeof(line), f) &&
 290                     sscanf(line, "%*s %511s %511s", proto, data) == 2)
 291                         got_data = 1;
 292                 if (f)
 293                         pclose(f);
 294         }
 295
 296         if (do_unlink) {
 297                 unlink(xauthfile);
 298                 rmdir(xauthdir);
 299         }
 300         if (xauthdir)
 301                 xfree(xauthdir);
 302         if (xauthfile)
 303                 xfree(xauthfile);
 304
 305         /*
 306          * If we didn't get authentication data, just make up some
 307          * data.  The forwarding code will check the validity of the
 308          * response anyway, and substitute this data.  The X11
 309          * server, however, will ignore this fake data and use
 310          * whatever authentication mechanisms it was using otherwise
 311          * for the local connection.
 312          */
 313         if (!got_data) {
 314                 u_int32_t rnd = 0;
 315
 316                 logit("Warning: No xauth data; "
 317                     "using fake authentication data for X11 forwarding.");
 318                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
 319                 for (i = 0; i < 16; i++) {
 320                         if (i % 4 == 0)
 321                                 rnd = arc4random();
 322                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
 323                             rnd & 0xff);
 324                         rnd >>= 8;
 325                 }
 326         }
 327 }
 328
 329 /*
 330  * This is called when the interactive is entered.  This checks if there is
 331  * an EOF coming on stdin.  We must check this explicitly, as select() does
 332  * not appear to wake up when redirecting from /dev/null.
 333  */
 334
 335 static void
 336 client_check_initial_eof_on_stdin(void)
 337 {
 338         int len;
 339         char buf[1];
 340
 341         /*
 342          * If standard input is to be "redirected from /dev/null", we simply
 343          * mark that we have seen an EOF and send an EOF message to the
 344          * server. Otherwise, we try to read a single character; it appears
 345          * that for some files, such /dev/null, select() never wakes up for
 346          * read for this descriptor, which means that we never get EOF.  This
 347          * way we will get the EOF if stdin comes from /dev/null or similar.
 348          */
 349         if (stdin_null_flag) {
 350                 /* Fake EOF on stdin. */
 351                 debug("Sending eof.");
 352                 stdin_eof = 1;
 353                 packet_start(SSH_CMSG_EOF);
 354                 packet_send();
 355         } else {
 356                 enter_non_blocking();
 357
 358                 /* Check for immediate EOF on stdin. */
 359                 len = read(fileno(stdin), buf, 1);
 360                 if (len == 0) {
 361                         /* EOF.  Record that we have seen it and send EOF to server. */
 362                         debug("Sending eof.");
 363                         stdin_eof = 1;
 364                         packet_start(SSH_CMSG_EOF);
 365                         packet_send();
 366                 } else if (len > 0) {
 367                         /*
 368                          * Got data.  We must store the data in the buffer,
 369                          * and also process it as an escape character if
 370                          * appropriate.
 371                          */
 372                         if ((u_char) buf[0] == escape_char)
 373                                 escape_pending = 1;
 374                         else
 375                                 buffer_append(&stdin_buffer, buf, 1);
 376                 }
 377                 leave_non_blocking();
 378         }
 379 }
 380
 381
 382 /*
 383  * Make packets from buffered stdin data, and buffer them for sending to the
 384  * connection.
 385  */
 386
 387 static void
 388 client_make_packets_from_stdin_data(void)
 389 {
 390         u_int len;
 391
 392         /* Send buffered stdin data to the server. */
 393         while (buffer_len(&stdin_buffer) > 0 &&
 394             packet_not_very_much_data_to_write()) {
 395                 len = buffer_len(&stdin_buffer);
 396                 /* Keep the packets at reasonable size. */
 397                 if (len > packet_get_maxsize())
 398                         len = packet_get_maxsize();
 399                 packet_start(SSH_CMSG_STDIN_DATA);
 400                 packet_put_string(buffer_ptr(&stdin_buffer), len);
 401                 packet_send();
 402                 buffer_consume(&stdin_buffer, len);
 403                 stdin_bytes += len;
 404                 /* If we have a pending EOF, send it now. */
 405                 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
 406                         packet_start(SSH_CMSG_EOF);
 407                         packet_send();
 408                 }
 409         }
 410 }
 411
 412 /*
 413  * Checks if the client window has changed, and sends a packet about it to
 414  * the server if so.  The actual change is detected elsewhere (by a software
 415  * interrupt on Unix); this just checks the flag and sends a message if
 416  * appropriate.
 417  */
 418
 419 static void
 420 client_check_window_change(void)
 421 {
 422         struct winsize ws;
 423
 424         if (! received_window_change_signal)
 425                 return;
 426         /** XXX race */
 427         received_window_change_signal = 0;
 428
 429         debug2("client_check_window_change: changed");
 430
 431         if (compat20) {
 432                 channel_send_window_changes();
 433         } else {
 434                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
 435                         return;
 436                 packet_start(SSH_CMSG_WINDOW_SIZE);
 437                 packet_put_int((u_int)ws.ws_row);
 438                 packet_put_int((u_int)ws.ws_col);
 439                 packet_put_int((u_int)ws.ws_xpixel);
 440                 packet_put_int((u_int)ws.ws_ypixel);
 441                 packet_send();
 442         }
 443 }
 444
 445 static void
 446 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
 447 {
 448         server_alive_timeouts = 0;
 449         client_global_request_reply_fwd(type, seq, ctxt);
 450 }
 451
 452 static void
 453 server_alive_check(void)
 454 {
 455         if (++server_alive_timeouts > options.server_alive_count_max)
 456                 packet_disconnect("Timeout, server not responding.");
 457         packet_start(SSH2_MSG_GLOBAL_REQUEST);
 458         packet_put_cstring("keepalive@openssh.com");
 459         packet_put_char(1);     /* boolean: want reply */
 460         packet_send();
 461 }
 462
 463 /*
 464  * Waits until the client can do something (some data becomes available on
 465  * one of the file descriptors).
 466  */
 467 static void
 468 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
 469     int *maxfdp, u_int *nallocp, int rekeying)
 470 {
 471         struct timeval tv, *tvp;
 472         int ret;
 473
 474         /* Add any selections by the channel mechanism. */
 475         channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
 476
 477         if (!compat20) {
 478                 /* Read from the connection, unless our buffers are full. */
 479                 if (buffer_len(&stdout_buffer) < buffer_high &&
 480                     buffer_len(&stderr_buffer) < buffer_high &&
 481                     channel_not_very_much_buffered_data())
 482                         FD_SET(connection_in, *readsetp);
 483                 /*
 484                  * Read from stdin, unless we have seen EOF or have very much
 485                  * buffered data to send to the server.
 486                  */
 487                 if (!stdin_eof && packet_not_very_much_data_to_write())
 488                         FD_SET(fileno(stdin), *readsetp);
 489
 490                 /* Select stdout/stderr if have data in buffer. */
 491                 if (buffer_len(&stdout_buffer) > 0)
 492                         FD_SET(fileno(stdout), *writesetp);
 493                 if (buffer_len(&stderr_buffer) > 0)
 494                         FD_SET(fileno(stderr), *writesetp);
 495         } else {
 496                 /* channel_prepare_select could have closed the last channel */
 497                 if (session_closed && !channel_still_open() &&
 498                     !packet_have_data_to_write()) {
 499                         /* clear mask since we did not call select() */
 500                         memset(*readsetp, 0, *nallocp);
 501                         memset(*writesetp, 0, *nallocp);
 502                         return;
 503                 } else {
 504                         FD_SET(connection_in, *readsetp);
 505                 }
 506         }
 507
 508         /* Select server connection if have data to write to the server. */
 509         if (packet_have_data_to_write())
 510                 FD_SET(connection_out, *writesetp);
 511
 512         if (control_fd != -1)
 513                 FD_SET(control_fd, *readsetp);
 514
 515         /*
 516          * Wait for something to happen.  This will suspend the process until
 517          * some selected descriptor can be read, written, or has some other
 518          * event pending.
 519          */
 520
 521         if (options.server_alive_interval == 0 || !compat20)
 522                 tvp = NULL;
 523         else {
 524                 tv.tv_sec = options.server_alive_interval;
 525                 tv.tv_usec = 0;
 526                 tvp = &tv;
 527         }
 528         ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
 529         if (ret < 0) {
 530                 char buf[100];
 531
 532                 /*
 533                  * We have to clear the select masks, because we return.
 534                  * We have to return, because the mainloop checks for the flags
 535                  * set by the signal handlers.
 536                  */
 537                 memset(*readsetp, 0, *nallocp);
 538                 memset(*writesetp, 0, *nallocp);
 539
 540                 if (errno == EINTR)
 541                         return;
 542                 /* Note: we might still have data in the buffers. */
 543                 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
 544                 buffer_append(&stderr_buffer, buf, strlen(buf));
 545                 quit_pending = 1;
 546         } else if (ret == 0)
 547                 server_alive_check();
 548 }
 549
 550 static void
 551 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
 552 {
 553         /* Flush stdout and stderr buffers. */
 554         if (buffer_len(bout) > 0)
 555                 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
 556         if (buffer_len(berr) > 0)
 557                 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
 558
 559         leave_raw_mode();
 560
 561         /*
 562          * Free (and clear) the buffer to reduce the amount of data that gets
 563          * written to swap.
 564          */
 565         buffer_free(bin);
 566         buffer_free(bout);
 567         buffer_free(berr);
 568
 569         /* Send the suspend signal to the program itself. */
 570         kill(getpid(), SIGTSTP);
 571
 572         /* Reset window sizes in case they have changed */
 573         received_window_change_signal = 1;
 574
 575         /* OK, we have been continued by the user. Reinitialize buffers. */
 576         buffer_init(bin);
 577         buffer_init(bout);
 578         buffer_init(berr);
 579
 580         enter_raw_mode();
 581 }
 582
 583 static void
 584 client_process_net_input(fd_set * readset)
 585 {
 586         int len;
 587         char buf[8192];
 588
 589         /*
 590          * Read input from the server, and add any such data to the buffer of
 591          * the packet subsystem.
 592          */
 593         if (FD_ISSET(connection_in, readset)) {
 594                 /* Read as much as possible. */
 595                 len = read(connection_in, buf, sizeof(buf));
 596                 if (len == 0) {
 597                         /* Received EOF.  The remote host has closed the connection. */
 598                         snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
 599                                  host);
 600                         buffer_append(&stderr_buffer, buf, strlen(buf));
 601                         quit_pending = 1;
 602                         return;
 603                 }
 604                 /*
 605                  * There is a kernel bug on Solaris that causes select to
 606                  * sometimes wake up even though there is no data available.
 607                  */
 608                 if (len < 0 && (errno == EAGAIN || errno == EINTR))
 609                         len = 0;
 610
 611                 if (len < 0) {
 612                         /* An error has encountered.  Perhaps there is a network problem. */
 613                         snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
 614                                  host, strerror(errno));
 615                         buffer_append(&stderr_buffer, buf, strlen(buf));
 616                         quit_pending = 1;
 617                         return;
 618                 }
 619                 packet_process_incoming(buf, len);
 620         }
 621 }
 622
 623 static void
 624 client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
 625 {
 626         int id;
 627         Channel *c;
 628
 629         id = packet_get_int();
 630         packet_check_eom();
 631
 632         if ((c = channel_lookup(id)) == NULL) {
 633                 error("%s: no channel for id %d", __func__, id);
 634                 return;
 635         }
 636
 637         if (type == SSH2_MSG_CHANNEL_SUCCESS)
 638                 debug2("Request suceeded on channel %d", id);
 639         else if (type == SSH2_MSG_CHANNEL_FAILURE) {
 640                 error("Request failed on channel %d", id);
 641                 channel_free(c);
 642         }
 643 }
 644
 645 static void
 646 client_extra_session2_setup(int id, void *arg)
 647 {
 648         struct confirm_ctx *cctx = arg;
 649         const char *display;
 650         Channel *c;
 651         int i;
 652
 653         if (cctx == NULL)
 654                 fatal("%s: cctx == NULL", __func__);
 655         if ((c = channel_lookup(id)) == NULL)
 656                 fatal("%s: no channel for id %d", __func__, id);
 657
 658         display = getenv("DISPLAY");
 659         if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
 660                 char *proto, *data;
 661                 /* Get reasonable local authentication information. */
 662                 client_x11_get_proto(display, options.xauth_location,
 663                     options.forward_x11_trusted, &proto, &data);
 664                 /* Request forwarding with authentication spoofing. */
 665                 debug("Requesting X11 forwarding with authentication spoofing.");
 666                 x11_request_forwarding_with_spoofing(id, display, proto, data);
 667                 /* XXX wait for reply */
 668         }
 669
 670         if (cctx->want_agent_fwd && options.forward_agent) {
 671                 debug("Requesting authentication agent forwarding.");
 672                 channel_request_start(id, "auth-agent-req@openssh.com", 0);
 673                 packet_send();
 674         }
 675
 676         client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
 677             cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
 678             client_subsystem_reply);
 679
 680         c->confirm_ctx = NULL;
 681         buffer_free(&cctx->cmd);
 682         xfree(cctx->term);
 683         if (cctx->env != NULL) {
 684                 for (i = 0; cctx->env[i] != NULL; i++)
 685                         xfree(cctx->env[i]);
 686                 xfree(cctx->env);
 687         }
 688         xfree(cctx);
 689 }
 690
 691 static void
 692 client_process_control(fd_set * readset)
 693 {
 694         Buffer m;
 695         Channel *c;
 696         int client_fd, new_fd[3], ver, allowed;
 697         socklen_t addrlen;
 698         struct sockaddr_storage addr;
 699         struct confirm_ctx *cctx;
 700         char *cmd;
 701         u_int i, len, env_len, command, flags;
 702         uid_t euid;
 703         gid_t egid;
 704
 705         /*
 706          * Accept connection on control socket
 707          */
 708         if (control_fd == -1 || !FD_ISSET(control_fd, readset))
 709                 return;
 710
 711         memset(&addr, 0, sizeof(addr));
 712         addrlen = sizeof(addr);
 713         if ((client_fd = accept(control_fd,
 714             (struct sockaddr*)&addr, &addrlen)) == -1) {
 715                 error("%s accept: %s", __func__, strerror(errno));
 716                 return;
 717         }
 718
 719         if (getpeereid(client_fd, &euid, &egid) < 0) {
 720                 error("%s getpeereid failed: %s", __func__, strerror(errno));
 721                 close(client_fd);
 722                 return;
 723         }
 724         if ((euid != 0) && (getuid() != euid)) {
 725                 error("control mode uid mismatch: peer euid %u != uid %u",
 726                     (u_int) euid, (u_int) getuid());
 727                 close(client_fd);
 728                 return;
 729         }
 730
 731         unset_nonblock(client_fd);
 732
 733         /* Read command */
 734         buffer_init(&m);
 735         if (ssh_msg_recv(client_fd, &m) == -1) {
 736                 error("%s: client msg_recv failed", __func__);
 737                 close(client_fd);
 738                 buffer_free(&m);
 739                 return;
 740         }
 741         if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
 742                 error("%s: wrong client version %d", __func__, ver);
 743                 buffer_free(&m);
 744                 close(client_fd);
 745                 return;
 746         }
 747
 748         allowed = 1;
 749         command = buffer_get_int(&m);
 750         flags = buffer_get_int(&m);
 751
 752         buffer_clear(&m);
 753
 754         switch (command) {
 755         case SSHMUX_COMMAND_OPEN:
 756                 if (options.control_master == SSHCTL_MASTER_ASK ||
 757                     options.control_master == SSHCTL_MASTER_AUTO_ASK)
 758                         allowed = ask_permission("Allow shared connection "
 759                             "to %s? ", host);
 760                 /* continue below */
 761                 break;
 762         case SSHMUX_COMMAND_TERMINATE:
 763                 if (options.control_master == SSHCTL_MASTER_ASK ||
 764                     options.control_master == SSHCTL_MASTER_AUTO_ASK)
 765                         allowed = ask_permission("Terminate shared connection "
 766                             "to %s? ", host);
 767                 if (allowed)
 768                         quit_pending = 1;
 769                 /* FALLTHROUGH */
 770         case SSHMUX_COMMAND_ALIVE_CHECK:
 771                 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
 772                 buffer_clear(&m);
 773                 buffer_put_int(&m, allowed);
 774                 buffer_put_int(&m, getpid());
 775                 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
 776                         error("%s: client msg_send failed", __func__);
 777                         close(client_fd);
 778                         buffer_free(&m);
 779                         return;
 780                 }
 781                 buffer_free(&m);
 782                 close(client_fd);
 783                 return;
 784         default:
 785                 error("Unsupported command %d", command);
 786                 buffer_free(&m);
 787                 close(client_fd);
 788                 return;
 789         }
 790
 791         /* Reply for SSHMUX_COMMAND_OPEN */
 792         buffer_clear(&m);
 793         buffer_put_int(&m, allowed);
 794         buffer_put_int(&m, getpid());
 795         if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
 796                 error("%s: client msg_send failed", __func__);
 797                 close(client_fd);
 798                 buffer_free(&m);
 799                 return;
 800         }
 801
 802         if (!allowed) {
 803                 error("Refused control connection");
 804                 close(client_fd);
 805                 buffer_free(&m);
 806                 return;
 807         }
 808
 809         buffer_clear(&m);
 810         if (ssh_msg_recv(client_fd, &m) == -1) {
 811                 error("%s: client msg_recv failed", __func__);
 812                 close(client_fd);
 813                 buffer_free(&m);
 814                 return;
 815         }
 816         if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
 817                 error("%s: wrong client version %d", __func__, ver);
 818                 buffer_free(&m);
 819                 close(client_fd);
 820                 return;
 821         }
 822
 823         cctx = xcalloc(1, sizeof(*cctx));
 824         cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
 825         cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
 826         cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
 827         cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
 828         cctx->term = buffer_get_string(&m, &len);
 829
 830         cmd = buffer_get_string(&m, &len);
 831         buffer_init(&cctx->cmd);
 832         buffer_append(&cctx->cmd, cmd, strlen(cmd));
 833
 834         env_len = buffer_get_int(&m);
 835         env_len = MIN(env_len, 4096);
 836         debug3("%s: receiving %d env vars", __func__, env_len);
 837         if (env_len != 0) {
 838                 cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
 839                 for (i = 0; i < env_len; i++)
 840                         cctx->env[i] = buffer_get_string(&m, &len);
 841                 cctx->env[i] = NULL;
 842         }
 843
 844         debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
 845             cctx->want_tty, cctx->want_subsys, cmd);
 846
 847         /* Gather fds from client */
 848         new_fd[0] = mm_receive_fd(client_fd);
 849         new_fd[1] = mm_receive_fd(client_fd);
 850         new_fd[2] = mm_receive_fd(client_fd);
 851
 852         debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
 853             new_fd[0], new_fd[1], new_fd[2]);
 854
 855         /* Try to pick up ttymodes from client before it goes raw */
 856         if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
 857                 error("%s: tcgetattr: %s", __func__, strerror(errno));
 858
 859         /* This roundtrip is just for synchronisation of ttymodes */
 860         buffer_clear(&m);
 861         if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
 862                 error("%s: client msg_send failed", __func__);
 863                 close(client_fd);
 864                 close(new_fd[0]);
 865                 close(new_fd[1]);
 866                 close(new_fd[2]);
 867                 buffer_free(&m);
 868                 xfree(cctx->term);
 869                 if (env_len != 0) {
 870                         for (i = 0; i < env_len; i++)
 871                                 xfree(cctx->env[i]);
 872                         xfree(cctx->env);
 873                 }
 874                 return;
 875         }
 876         buffer_free(&m);
 877
 878         /* enable nonblocking unless tty */
 879         if (!isatty(new_fd[0]))
 880                 set_nonblock(new_fd[0]);
 881         if (!isatty(new_fd[1]))
 882                 set_nonblock(new_fd[1]);
 883         if (!isatty(new_fd[2]))
 884                 set_nonblock(new_fd[2]);
 885
 886         set_nonblock(client_fd);
 887
 888         c = channel_new("session", SSH_CHANNEL_OPENING,
 889             new_fd[0], new_fd[1], new_fd[2],
 890             CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
 891             CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
 892
 893         /* XXX */
 894         c->ctl_fd = client_fd;
 895
 896         debug3("%s: channel_new: %d", __func__, c->self);
 897
 898         channel_send_open(c->self);
 899         channel_register_confirm(c->self, client_extra_session2_setup, cctx);
 900 }
 901
 902 static void
 903 process_cmdline(void)
 904 {
 905         void (*handler)(int);
 906         char *s, *cmd, *cancel_host;
 907         int delete = 0;
 908         int local = 0;
 909         u_short cancel_port;
 910         Forward fwd;
 911
 912         leave_raw_mode();
 913         handler = signal(SIGINT, SIG_IGN);
 914         cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
 915         if (s == NULL)
 916                 goto out;
 917         while (*s && isspace(*s))
 918                 s++;
 919         if (*s == '-')
 920                 s++;    /* Skip cmdline '-', if any */
 921         if (*s == '\0')
 922                 goto out;
 923
 924         if (*s == 'h' || *s == 'H' || *s == '?') {
 925                 logit("Commands:");
 926                 logit("      -Lport:host:hostport    Request local forward");
 927                 logit("      -Rport:host:hostport    Request remote forward");
 928                 logit("      -KRhostport             Cancel remote forward");
 929                 if (!options.permit_local_command)
 930                         goto out;
 931                 logit("      !args                   Execute local command");
 932                 goto out;
 933         }
 934
 935         if (*s == '!' && options.permit_local_command) {
 936                 s++;
 937                 ssh_local_cmd(s);
 938                 goto out;
 939         }
 940
 941         if (*s == 'K') {
 942                 delete = 1;
 943                 s++;
 944         }
 945         if (*s != 'L' && *s != 'R') {
 946                 logit("Invalid command.");
 947                 goto out;
 948         }
 949         if (*s == 'L')
 950                 local = 1;
 951         if (local && delete) {
 952                 logit("Not supported.");
 953                 goto out;
 954         }
 955         if ((!local || delete) && !compat20) {
 956                 logit("Not supported for SSH protocol version 1.");
 957                 goto out;
 958         }
 959
 960         s++;
 961         while (*s && isspace(*s))
 962                 s++;
 963
 964         if (delete) {
 965                 cancel_port = 0;
 966                 cancel_host = hpdelim(&s);      /* may be NULL */
 967                 if (s != NULL) {
 968                         cancel_port = a2port(s);
 969                         cancel_host = cleanhostname(cancel_host);
 970                 } else {
 971                         cancel_port = a2port(cancel_host);
 972                         cancel_host = NULL;
 973                 }
 974                 if (cancel_port == 0) {
 975                         logit("Bad forwarding close port");
 976                         goto out;
 977                 }
 978                 channel_request_rforward_cancel(cancel_host, cancel_port);
 979         } else {
 980                 if (!parse_forward(&fwd, s)) {
 981                         logit("Bad forwarding specification.");
 982                         goto out;
 983                 }
 984                 if (local) {
 985                         if (channel_setup_local_fwd_listener(fwd.listen_host,
 986                             fwd.listen_port, fwd.connect_host,
 987                             fwd.connect_port, options.gateway_ports) < 0) {
 988                                 logit("Port forwarding failed.");
 989                                 goto out;
 990                         }
 991                 } else {
 992                         channel_request_remote_forwarding(fwd.listen_host,
 993                             fwd.listen_port, fwd.connect_host,
 994                             fwd.connect_port);
 995                 }
 996
 997                 logit("Forwarding port.");
 998         }
 999
1000 out:
1001         signal(SIGINT, handler);
1002         enter_raw_mode();
1003         if (cmd)
1004                 xfree(cmd);
1005 }
1006
1007 /* process the characters one by one */
1008 static int
1009 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1010 {
1011         char string[1024];
1012         pid_t pid;
1013         int bytes = 0;
1014         u_int i;
1015         u_char ch;
1016         char *s;
1017
1018         if (len <= 0)
1019                 return (0);
1020
1021         for (i = 0; i < (u_int)len; i++) {
1022                 /* Get one character at a time. */
1023                 ch = buf[i];
1024
1025                 if (escape_pending) {
1026                         /* We have previously seen an escape character. */
1027                         /* Clear the flag now. */
1028                         escape_pending = 0;
1029
1030                         /* Process the escaped character. */
1031                         switch (ch) {
1032                         case '.':
1033                                 /* Terminate the connection. */
1034                                 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1035                                 buffer_append(berr, string, strlen(string));
1036
1037                                 quit_pending = 1;
1038                                 return -1;
1039
1040                         case 'Z' - 64:
1041                                 /* Suspend the program. */
1042                                 /* Print a message to that effect to the user. */
1043                                 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1044                                 buffer_append(berr, string, strlen(string));
1045
1046                                 /* Restore terminal modes and suspend. */
1047                                 client_suspend_self(bin, bout, berr);
1048
1049                                 /* We have been continued. */
1050                                 continue;
1051
1052                         case 'B':
1053                                 if (compat20) {
1054                                         snprintf(string, sizeof string,
1055                                             "%cB\r\n", escape_char);
1056                                         buffer_append(berr, string,
1057                                             strlen(string));
1058                                         channel_request_start(session_ident,
1059                                             "break", 0);
1060                                         packet_put_int(1000);
1061                                         packet_send();
1062                                 }
1063                                 continue;
1064
1065                         case 'R':
1066                                 if (compat20) {
1067                                         if (datafellows & SSH_BUG_NOREKEY)
1068                                                 logit("Server does not support re-keying");
1069                                         else
1070                                                 need_rekeying = 1;
1071                                 }
1072                                 continue;
1073
1074                         case '&':
1075                                 /*
1076                                  * Detach the program (continue to serve connections,
1077                                  * but put in background and no more new connections).
1078                                  */
1079                                 /* Restore tty modes. */
1080                                 leave_raw_mode();
1081
1082                                 /* Stop listening for new connections. */
1083                                 channel_stop_listening();
1084
1085                                 snprintf(string, sizeof string,
1086                                     "%c& [backgrounded]\n", escape_char);
1087                                 buffer_append(berr, string, strlen(string));
1088
1089                                 /* Fork into background. */
1090                                 pid = fork();
1091                                 if (pid < 0) {
1092                                         error("fork: %.100s", strerror(errno));
1093                                         continue;
1094                                 }
1095                                 if (pid != 0) { /* This is the parent. */
1096                                         /* The parent just exits. */
1097                                         exit(0);
1098                                 }
1099                                 /* The child continues serving connections. */
1100                                 if (compat20) {
1101                                         buffer_append(bin, "\004", 1);
1102                                         /* fake EOF on stdin */
1103                                         return -1;
1104                                 } else if (!stdin_eof) {
1105                                         /*
1106                                          * Sending SSH_CMSG_EOF alone does not always appear
1107                                          * to be enough.  So we try to send an EOF character
1108                                          * first.
1109                                          */
1110                                         packet_start(SSH_CMSG_STDIN_DATA);
1111                                         packet_put_string("\004", 1);
1112                                         packet_send();
1113                                         /* Close stdin. */
1114                                         stdin_eof = 1;
1115                                         if (buffer_len(bin) == 0) {
1116                                                 packet_start(SSH_CMSG_EOF);
1117                                                 packet_send();
1118                                         }
1119                                 }
1120                                 continue;
1121
1122                         case '?':
1123                                 snprintf(string, sizeof string,
1124 "%c?\r\n\
1125 Supported escape sequences:\r\n\
1126 %c.  - terminate connection\r\n\
1127 %cB  - send a BREAK to the remote system\r\n\
1128 %cC  - open a command line\r\n\
1129 %cR  - Request rekey (SSH protocol 2 only)\r\n\
1130 %c^Z - suspend ssh\r\n\
1131 %c#  - list forwarded connections\r\n\
1132 %c&  - background ssh (when waiting for connections to terminate)\r\n\
1133 %c?  - this message\r\n\
1134 %c%c  - send the escape character by typing it twice\r\n\
1135 (Note that escapes are only recognized immediately after newline.)\r\n",
1136                                     escape_char, escape_char, escape_char, escape_char,
1137                                     escape_char, escape_char, escape_char, escape_char,
1138                                     escape_char, escape_char, escape_char);
1139                                 buffer_append(berr, string, strlen(string));
1140                                 continue;
1141
1142                         case '#':
1143                                 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1144                                 buffer_append(berr, string, strlen(string));
1145                                 s = channel_open_message();
1146                                 buffer_append(berr, s, strlen(s));
1147                                 xfree(s);
1148                                 continue;
1149
1150                         case 'C':
1151                                 process_cmdline();
1152                                 continue;
1153
1154                         default:
1155                                 if (ch != escape_char) {
1156                                         buffer_put_char(bin, escape_char);
1157                                         bytes++;
1158                                 }
1159                                 /* Escaped characters fall through here */
1160                                 break;
1161                         }
1162                 } else {
1163                         /*
1164                          * The previous character was not an escape char. Check if this
1165                          * is an escape.
1166                          */
1167                         if (last_was_cr && ch == escape_char) {
1168                                 /* It is. Set the flag and continue to next character. */
1169                                 escape_pending = 1;
1170                                 continue;
1171                         }
1172                 }
1173
1174                 /*
1175                  * Normal character.  Record whether it was a newline,
1176                  * and append it to the buffer.
1177                  */
1178                 last_was_cr = (ch == '\r' || ch == '\n');
1179                 buffer_put_char(bin, ch);
1180                 bytes++;
1181         }
1182         return bytes;
1183 }
1184
1185 static void
1186 client_process_input(fd_set * readset)
1187 {
1188         int len;
1189         char buf[8192];
1190
1191         /* Read input from stdin. */
1192         if (FD_ISSET(fileno(stdin), readset)) {
1193                 /* Read as much as possible. */
1194                 len = read(fileno(stdin), buf, sizeof(buf));
1195                 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1196                         return;         /* we'll try again later */
1197                 if (len <= 0) {
1198                         /*
1199                          * Received EOF or error.  They are treated
1200                          * similarly, except that an error message is printed
1201                          * if it was an error condition.
1202                          */
1203                         if (len < 0) {
1204                                 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1205                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1206                         }
1207                         /* Mark that we have seen EOF. */
1208                         stdin_eof = 1;
1209                         /*
1210                          * Send an EOF message to the server unless there is
1211                          * data in the buffer.  If there is data in the
1212                          * buffer, no message will be sent now.  Code
1213                          * elsewhere will send the EOF when the buffer
1214                          * becomes empty if stdin_eof is set.
1215                          */
1216                         if (buffer_len(&stdin_buffer) == 0) {
1217                                 packet_start(SSH_CMSG_EOF);
1218                                 packet_send();
1219                         }
1220                 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1221                         /*
1222                          * Normal successful read, and no escape character.
1223                          * Just append the data to buffer.
1224                          */
1225                         buffer_append(&stdin_buffer, buf, len);
1226                 } else {
1227                         /*
1228                          * Normal, successful read.  But we have an escape character
1229                          * and have to process the characters one by one.
1230                          */
1231                         if (process_escapes(&stdin_buffer, &stdout_buffer,
1232                             &stderr_buffer, buf, len) == -1)
1233                                 return;
1234                 }
1235         }
1236 }
1237
1238 static void
1239 client_process_output(fd_set * writeset)
1240 {
1241         int len;
1242         char buf[100];
1243
1244         /* Write buffered output to stdout. */
1245         if (FD_ISSET(fileno(stdout), writeset)) {
1246                 /* Write as much data as possible. */
1247                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1248                     buffer_len(&stdout_buffer));
1249                 if (len <= 0) {
1250                         if (errno == EINTR || errno == EAGAIN)
1251                                 len = 0;
1252                         else {
1253                                 /*
1254                                  * An error or EOF was encountered.  Put an
1255                                  * error message to stderr buffer.
1256                                  */
1257                                 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1258                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1259                                 quit_pending = 1;
1260                                 return;
1261                         }
1262                 }
1263                 /* Consume printed data from the buffer. */
1264                 buffer_consume(&stdout_buffer, len);
1265                 stdout_bytes += len;
1266         }
1267         /* Write buffered output to stderr. */
1268         if (FD_ISSET(fileno(stderr), writeset)) {
1269                 /* Write as much data as possible. */
1270                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1271                     buffer_len(&stderr_buffer));
1272                 if (len <= 0) {
1273                         if (errno == EINTR || errno == EAGAIN)
1274                                 len = 0;
1275                         else {
1276                                 /* EOF or error, but can't even print error message. */
1277                                 quit_pending = 1;
1278                                 return;
1279                         }
1280                 }
1281                 /* Consume printed characters from the buffer. */
1282                 buffer_consume(&stderr_buffer, len);
1283                 stderr_bytes += len;
1284         }
1285 }
1286
1287 /*
1288  * Get packets from the connection input buffer, and process them as long as
1289  * there are packets available.
1290  *
1291  * Any unknown packets received during the actual
1292  * session cause the session to terminate.  This is
1293  * intended to make debugging easier since no
1294  * confirmations are sent.  Any compatible protocol
1295  * extensions must be negotiated during the
1296  * preparatory phase.
1297  */
1298
1299 static void
1300 client_process_buffered_input_packets(void)
1301 {
1302         dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1303 }
1304
1305 /* scan buf[] for '~' before sending data to the peer */
1306
1307 static int
1308 simple_escape_filter(Channel *c, char *buf, int len)
1309 {
1310         /* XXX we assume c->extended is writeable */
1311         return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1312 }
1313
1314 static void
1315 client_channel_closed(int id, void *arg)
1316 {
1317         channel_cancel_cleanup(id);
1318         session_closed = 1;
1319         leave_raw_mode();
1320 }
1321
1322 /*
1323  * Implements the interactive session with the server.  This is called after
1324  * the user has been authenticated, and a command has been started on the
1325  * remote host.  If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1326  * used as an escape character for terminating or suspending the session.
1327  */
1328
1329 int
1330 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1331 {
1332         fd_set *readset = NULL, *writeset = NULL;
1333         double start_time, total_time;
1334         int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1335         u_int nalloc = 0;
1336         char buf[100];
1337
1338         debug("Entering interactive session.");
1339
1340         start_time = get_current_time();
1341
1342         /* Initialize variables. */
1343         escape_pending = 0;
1344         last_was_cr = 1;
1345         exit_status = -1;
1346         stdin_eof = 0;
1347         buffer_high = 64 * 1024;
1348         connection_in = packet_get_connection_in();
1349         connection_out = packet_get_connection_out();
1350         max_fd = MAX(connection_in, connection_out);
1351         if (control_fd != -1)
1352                 max_fd = MAX(max_fd, control_fd);
1353
1354         if (!compat20) {
1355                 /* enable nonblocking unless tty */
1356                 if (!isatty(fileno(stdin)))
1357                         set_nonblock(fileno(stdin));
1358                 if (!isatty(fileno(stdout)))
1359                         set_nonblock(fileno(stdout));
1360                 if (!isatty(fileno(stderr)))
1361                         set_nonblock(fileno(stderr));
1362                 max_fd = MAX(max_fd, fileno(stdin));
1363                 max_fd = MAX(max_fd, fileno(stdout));
1364                 max_fd = MAX(max_fd, fileno(stderr));
1365         }
1366         stdin_bytes = 0;
1367         stdout_bytes = 0;
1368         stderr_bytes = 0;
1369         quit_pending = 0;
1370         escape_char = escape_char_arg;
1371
1372         /* Initialize buffers. */
1373         buffer_init(&stdin_buffer);
1374         buffer_init(&stdout_buffer);
1375         buffer_init(&stderr_buffer);
1376
1377         client_init_dispatch();
1378
1379         /*
1380          * Set signal handlers, (e.g. to restore non-blocking mode)
1381          * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1382          */
1383         if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1384                 signal(SIGHUP, signal_handler);
1385         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1386                 signal(SIGINT, signal_handler);
1387         if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1388                 signal(SIGQUIT, signal_handler);
1389         if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1390                 signal(SIGTERM, signal_handler);
1391         signal(SIGWINCH, window_change_handler);
1392
1393         if (have_pty)
1394                 enter_raw_mode();
1395
1396         if (compat20) {
1397                 session_ident = ssh2_chan_id;
1398                 if (escape_char != SSH_ESCAPECHAR_NONE)
1399                         channel_register_filter(session_ident,
1400                             simple_escape_filter, NULL);
1401                 if (session_ident != -1)
1402                         channel_register_cleanup(session_ident,
1403                             client_channel_closed, 0);
1404         } else {
1405                 /* Check if we should immediately send eof on stdin. */
1406                 client_check_initial_eof_on_stdin();
1407         }
1408
1409         /* Main loop of the client for the interactive session mode. */
1410         while (!quit_pending) {
1411
1412                 /* Process buffered packets sent by the server. */
1413                 client_process_buffered_input_packets();
1414
1415                 if (compat20 && session_closed && !channel_still_open())
1416                         break;
1417
1418                 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1419
1420                 if (rekeying) {
1421                         debug("rekeying in progress");
1422                 } else {
1423                         /*
1424                          * Make packets of buffered stdin data, and buffer
1425                          * them for sending to the server.
1426                          */
1427                         if (!compat20)
1428                                 client_make_packets_from_stdin_data();
1429
1430                         /*
1431                          * Make packets from buffered channel data, and
1432                          * enqueue them for sending to the server.
1433                          */
1434                         if (packet_not_very_much_data_to_write())
1435                                 channel_output_poll();
1436
1437                         /*
1438                          * Check if the window size has changed, and buffer a
1439                          * message about it to the server if so.
1440                          */
1441                         client_check_window_change();
1442
1443                         if (quit_pending)
1444                                 break;
1445                 }
1446                 /*
1447                  * Wait until we have something to do (something becomes
1448                  * available on one of the descriptors).
1449                  */
1450                 max_fd2 = max_fd;
1451                 client_wait_until_can_do_something(&readset, &writeset,
1452                     &max_fd2, &nalloc, rekeying);
1453
1454                 if (quit_pending)
1455                         break;
1456
1457                 /* Do channel operations unless rekeying in progress. */
1458                 if (!rekeying) {
1459                         channel_after_select(readset, writeset);
1460                         if (need_rekeying || packet_need_rekeying()) {
1461                                 debug("need rekeying");
1462                                 xxx_kex->done = 0;
1463                                 kex_send_kexinit(xxx_kex);
1464                                 need_rekeying = 0;
1465                         }
1466                 }
1467
1468                 /* Buffer input from the connection.  */
1469                 client_process_net_input(readset);
1470
1471                 /* Accept control connections.  */
1472                 client_process_control(readset);
1473
1474                 if (quit_pending)
1475                         break;
1476
1477                 if (!compat20) {
1478                         /* Buffer data from stdin */
1479                         client_process_input(readset);
1480                         /*
1481                          * Process output to stdout and stderr.  Output to
1482                          * the connection is processed elsewhere (above).
1483                          */
1484                         client_process_output(writeset);
1485                 }
1486
1487                 /* Send as much buffered packet data as possible to the sender. */
1488                 if (FD_ISSET(connection_out, writeset))
1489                         packet_write_poll();
1490         }
1491         if (readset)
1492                 xfree(readset);
1493         if (writeset)
1494                 xfree(writeset);
1495
1496         /* Terminate the session. */
1497
1498         /* Stop watching for window change. */
1499         signal(SIGWINCH, SIG_DFL);
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, "Connection to %.64s closed.\r\n", host);
1533                 buffer_append(&stderr_buffer, buf, strlen(buf));
1534         }
1535
1536         /* Output any buffered data for stdout. */
1537         while (buffer_len(&stdout_buffer) > 0) {
1538                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1539                     buffer_len(&stdout_buffer));
1540                 if (len <= 0) {
1541                         error("Write failed flushing stdout buffer.");
1542                         break;
1543                 }
1544                 buffer_consume(&stdout_buffer, len);
1545                 stdout_bytes += 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                 stderr_bytes += len;
1558         }
1559
1560         /* Clear and free any buffers. */
1561         memset(buf, 0, sizeof(buf));
1562         buffer_free(&stdin_buffer);
1563         buffer_free(&stdout_buffer);
1564         buffer_free(&stderr_buffer);
1565
1566         /* Report bytes transferred, and transfer rates. */
1567         total_time = get_current_time() - start_time;
1568         debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1569             stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1570         if (total_time > 0)
1571                 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1572                     stdin_bytes / total_time, stdout_bytes / total_time,
1573                     stderr_bytes / total_time);
1574
1575         /* Return the exit status of the program. */
1576         debug("Exit status %d", exit_status);
1577         return exit_status;
1578 }
1579
1580 /*********/
1581
1582 static void
1583 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1584 {
1585         u_int data_len;
1586         char *data = packet_get_string(&data_len);
1587         packet_check_eom();
1588         buffer_append(&stdout_buffer, data, data_len);
1589         memset(data, 0, data_len);
1590         xfree(data);
1591 }
1592 static void
1593 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1594 {
1595         u_int data_len;
1596         char *data = packet_get_string(&data_len);
1597         packet_check_eom();
1598         buffer_append(&stderr_buffer, data, data_len);
1599         memset(data, 0, data_len);
1600         xfree(data);
1601 }
1602 static void
1603 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1604 {
1605         exit_status = packet_get_int();
1606         packet_check_eom();
1607         /* Acknowledge the exit. */
1608         packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1609         packet_send();
1610         /*
1611          * Must wait for packet to be sent since we are
1612          * exiting the loop.
1613          */
1614         packet_write_wait();
1615         /* Flag that we want to exit. */
1616         quit_pending = 1;
1617 }
1618 static void
1619 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1620 {
1621         Channel *c = NULL;
1622         int remote_id, sock;
1623
1624         /* Read the remote channel number from the message. */
1625         remote_id = packet_get_int();
1626         packet_check_eom();
1627
1628         /*
1629          * Get a connection to the local authentication agent (this may again
1630          * get forwarded).
1631          */
1632         sock = ssh_get_authentication_socket();
1633
1634         /*
1635          * If we could not connect the agent, send an error message back to
1636          * the server. This should never happen unless the agent dies,
1637          * because authentication forwarding is only enabled if we have an
1638          * agent.
1639          */
1640         if (sock >= 0) {
1641                 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1642                     -1, 0, 0, 0, "authentication agent connection", 1);
1643                 c->remote_id = remote_id;
1644                 c->force_drain = 1;
1645         }
1646         if (c == NULL) {
1647                 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1648                 packet_put_int(remote_id);
1649         } else {
1650                 /* Send a confirmation to the remote host. */
1651                 debug("Forwarding authentication connection.");
1652                 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1653                 packet_put_int(remote_id);
1654                 packet_put_int(c->self);
1655         }
1656         packet_send();
1657 }
1658
1659 static Channel *
1660 client_request_forwarded_tcpip(const char *request_type, int rchan)
1661 {
1662         Channel *c = NULL;
1663         char *listen_address, *originator_address;
1664         int listen_port, originator_port;
1665         int sock;
1666
1667         /* Get rest of the packet */
1668         listen_address = packet_get_string(NULL);
1669         listen_port = packet_get_int();
1670         originator_address = packet_get_string(NULL);
1671         originator_port = packet_get_int();
1672         packet_check_eom();
1673
1674         debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1675             listen_address, listen_port, originator_address, originator_port);
1676
1677         sock = channel_connect_by_listen_address(listen_port);
1678         if (sock < 0) {
1679                 xfree(originator_address);
1680                 xfree(listen_address);
1681                 return NULL;
1682         }
1683         c = channel_new("forwarded-tcpip",
1684             SSH_CHANNEL_CONNECTING, sock, sock, -1,
1685             CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1686             originator_address, 1);
1687         xfree(originator_address);
1688         xfree(listen_address);
1689         return c;
1690 }
1691
1692 static Channel *
1693 client_request_x11(const char *request_type, int rchan)
1694 {
1695         Channel *c = NULL;
1696         char *originator;
1697         int originator_port;
1698         int sock;
1699
1700         if (!options.forward_x11) {
1701                 error("Warning: ssh server tried X11 forwarding.");
1702                 error("Warning: this is probably a break-in attempt by a malicious server.");
1703                 return NULL;
1704         }
1705         originator = packet_get_string(NULL);
1706         if (datafellows & SSH_BUG_X11FWD) {
1707                 debug2("buggy server: x11 request w/o originator_port");
1708                 originator_port = 0;
1709         } else {
1710                 originator_port = packet_get_int();
1711         }
1712         packet_check_eom();
1713         /* XXX check permission */
1714         debug("client_request_x11: request from %s %d", originator,
1715             originator_port);
1716         xfree(originator);
1717         sock = x11_connect_display();
1718         if (sock < 0)
1719                 return NULL;
1720         c = channel_new("x11",
1721             SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1722             CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1723         c->force_drain = 1;
1724         return c;
1725 }
1726
1727 static Channel *
1728 client_request_agent(const char *request_type, int rchan)
1729 {
1730         Channel *c = NULL;
1731         int sock;
1732
1733         if (!options.forward_agent) {
1734                 error("Warning: ssh server tried agent forwarding.");
1735                 error("Warning: this is probably a break-in attempt by a malicious server.");
1736                 return NULL;
1737         }
1738         sock =  ssh_get_authentication_socket();
1739         if (sock < 0)
1740                 return NULL;
1741         c = channel_new("authentication agent connection",
1742             SSH_CHANNEL_OPEN, sock, sock, -1,
1743             CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1744             "authentication agent connection", 1);
1745         c->force_drain = 1;
1746         return c;
1747 }
1748
1749 /* XXXX move to generic input handler */
1750 static void
1751 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1752 {
1753         Channel *c = NULL;
1754         char *ctype;
1755         int rchan;
1756         u_int rmaxpack, rwindow, len;
1757
1758         ctype = packet_get_string(&len);
1759         rchan = packet_get_int();
1760         rwindow = packet_get_int();
1761         rmaxpack = packet_get_int();
1762
1763         debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1764             ctype, rchan, rwindow, rmaxpack);
1765
1766         if (strcmp(ctype, "forwarded-tcpip") == 0) {
1767                 c = client_request_forwarded_tcpip(ctype, rchan);
1768         } else if (strcmp(ctype, "x11") == 0) {
1769                 c = client_request_x11(ctype, rchan);
1770         } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1771                 c = client_request_agent(ctype, rchan);
1772         }
1773 /* XXX duplicate : */
1774         if (c != NULL) {
1775                 debug("confirm %s", ctype);
1776                 c->remote_id = rchan;
1777                 c->remote_window = rwindow;
1778                 c->remote_maxpacket = rmaxpack;
1779                 if (c->type != SSH_CHANNEL_CONNECTING) {
1780                         packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1781                         packet_put_int(c->remote_id);
1782                         packet_put_int(c->self);
1783                         packet_put_int(c->local_window);
1784                         packet_put_int(c->local_maxpacket);
1785                         packet_send();
1786                 }
1787         } else {
1788                 debug("failure %s", ctype);
1789                 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1790                 packet_put_int(rchan);
1791                 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1792                 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1793                         packet_put_cstring("open failed");
1794                         packet_put_cstring("");
1795                 }
1796                 packet_send();
1797         }
1798         xfree(ctype);
1799 }
1800 static void
1801 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1802 {
1803         Channel *c = NULL;
1804         int exitval, id, reply, success = 0;
1805         char *rtype;
1806
1807         id = packet_get_int();
1808         rtype = packet_get_string(NULL);
1809         reply = packet_get_char();
1810
1811         debug("client_input_channel_req: channel %d rtype %s reply %d",
1812             id, rtype, reply);
1813
1814         if (id == -1) {
1815                 error("client_input_channel_req: request for channel -1");
1816         } else if ((c = channel_lookup(id)) == NULL) {
1817                 error("client_input_channel_req: channel %d: unknown channel", id);
1818         } else if (strcmp(rtype, "exit-status") == 0) {
1819                 exitval = packet_get_int();
1820                 if (id == session_ident) {
1821                         success = 1;
1822                         exit_status = exitval;
1823                 } else if (c->ctl_fd == -1) {
1824                         error("client_input_channel_req: unexpected channel %d",
1825                             session_ident);
1826                 } else {
1827                         atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1828                         success = 1;
1829                 }
1830                 packet_check_eom();
1831         }
1832         if (reply) {
1833                 packet_start(success ?
1834                     SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1835                 packet_put_int(id);
1836                 packet_send();
1837         }
1838         xfree(rtype);
1839 }
1840 static void
1841 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1842 {
1843         char *rtype;
1844         int want_reply;
1845         int success = 0;
1846
1847         rtype = packet_get_string(NULL);
1848         want_reply = packet_get_char();
1849         debug("client_input_global_request: rtype %s want_reply %d",
1850             rtype, want_reply);
1851         if (want_reply) {
1852                 packet_start(success ?
1853                     SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1854                 packet_send();
1855                 packet_write_wait();
1856         }
1857         xfree(rtype);
1858 }
1859
1860 void
1861 client_session2_setup(int id, int want_tty, int want_subsystem,
1862     const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1863     dispatch_fn *subsys_repl)
1864 {
1865         int len;
1866         Channel *c = NULL;
1867
1868         debug2("%s: id %d", __func__, id);
1869
1870         if ((c = channel_lookup(id)) == NULL)
1871                 fatal("client_session2_setup: channel %d: unknown channel", id);
1872
1873         if (want_tty) {
1874                 struct winsize ws;
1875                 struct termios tio;
1876
1877                 /* Store window size in the packet. */
1878                 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1879                         memset(&ws, 0, sizeof(ws));
1880
1881                 channel_request_start(id, "pty-req", 0);
1882                 packet_put_cstring(term != NULL ? term : "");
1883                 packet_put_int((u_int)ws.ws_col);
1884                 packet_put_int((u_int)ws.ws_row);
1885                 packet_put_int((u_int)ws.ws_xpixel);
1886                 packet_put_int((u_int)ws.ws_ypixel);
1887                 tio = get_saved_tio();
1888                 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1889                 packet_send();
1890                 /* XXX wait for reply */
1891                 c->client_tty = 1;
1892         }
1893
1894         /* Transfer any environment variables from client to server */
1895         if (options.num_send_env != 0 && env != NULL) {
1896                 int i, j, matched;
1897                 char *name, *val;
1898
1899                 debug("Sending environment.");
1900                 for (i = 0; env[i] != NULL; i++) {
1901                         /* Split */
1902                         name = xstrdup(env[i]);
1903                         if ((val = strchr(name, '=')) == NULL) {
1904                                 xfree(name);
1905                                 continue;
1906                         }
1907                         *val++ = '\0';
1908
1909                         matched = 0;
1910                         for (j = 0; j < options.num_send_env; j++) {
1911                                 if (match_pattern(name, options.send_env[j])) {
1912                                         matched = 1;
1913                                         break;
1914                                 }
1915                         }
1916                         if (!matched) {
1917                                 debug3("Ignored env %s", name);
1918                                 xfree(name);
1919                                 continue;
1920                         }
1921
1922                         debug("Sending env %s = %s", name, val);
1923                         channel_request_start(id, "env", 0);
1924                         packet_put_cstring(name);
1925                         packet_put_cstring(val);
1926                         packet_send();
1927                         xfree(name);
1928                 }
1929         }
1930
1931         len = buffer_len(cmd);
1932         if (len > 0) {
1933                 if (len > 900)
1934                         len = 900;
1935                 if (want_subsystem) {
1936                         debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1937                         channel_request_start(id, "subsystem", subsys_repl != NULL);
1938                         if (subsys_repl != NULL) {
1939                                 /* register callback for reply */
1940                                 /* XXX we assume that client_loop has already been called */
1941                                 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1942                                 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1943                         }
1944                 } else {
1945                         debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1946                         channel_request_start(id, "exec", 0);
1947                 }
1948                 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1949                 packet_send();
1950         } else {
1951                 channel_request_start(id, "shell", 0);
1952                 packet_send();
1953         }
1954 }
1955
1956 static void
1957 client_init_dispatch_20(void)
1958 {
1959         dispatch_init(&dispatch_protocol_error);
1960
1961         dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1962         dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1963         dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1964         dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1965         dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1966         dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1967         dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1968         dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1969         dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1970         dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1971
1972         /* rekeying */
1973         dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1974
1975         /* global request reply messages */
1976         dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1977         dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1978 }
1979 static void
1980 client_init_dispatch_13(void)
1981 {
1982         dispatch_init(NULL);
1983         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1984         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1985         dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1986         dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1987         dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1988         dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1989         dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1990         dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1991         dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1992
1993         dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1994             &client_input_agent_open : &deny_input_open);
1995         dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1996             &x11_input_open : &deny_input_open);
1997 }
1998 static void
1999 client_init_dispatch_15(void)
2000 {
2001         client_init_dispatch_13();
2002         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2003         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2004 }
2005 static void
2006 client_init_dispatch(void)
2007 {
2008         if (compat20)
2009                 client_init_dispatch_20();
2010         else if (compat13)
2011                 client_init_dispatch_13();
2012         else
2013                 client_init_dispatch_15();
2014 }
2015
2016 /* client specific fatal cleanup */
2017 void
2018 cleanup_exit(int i)
2019 {
2020         leave_raw_mode();
2021         leave_non_blocking();
2022         if (options.control_path != NULL && control_fd != -1)
2023                 unlink(options.control_path);
2024         _exit(i);
2025 }