crypto/openssh-4/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 1.141 2005/07/16 01:35:24 djm Exp $");
  63
  64 #include "ssh.h"
  65 #include "ssh1.h"
  66 #include "ssh2.h"
  67 #include "xmalloc.h"
  68 #include "packet.h"
  69 #include "buffer.h"
  70 #include "compat.h"
  71 #include "channels.h"
  72 #include "dispatch.h"
  73 #include "buffer.h"
  74 #include "bufaux.h"
  75 #include "key.h"
  76 #include "kex.h"
  77 #include "log.h"
  78 #include "readconf.h"
  79 #include "clientloop.h"
  80 #include "authfd.h"
  81 #include "atomicio.h"
  82 #include "sshpty.h"
  83 #include "misc.h"
  84 #include "monitor_fdpass.h"
  85 #include "match.h"
  86 #include "msg.h"
  87
  88 /* import options */
  89 extern Options options;
  90
  91 /* Flag indicating that stdin should be redirected from /dev/null. */
  92 extern int stdin_null_flag;
  93
  94 /* Flag indicating that no shell has been requested */
  95 extern int no_shell_flag;
  96
  97 /* Control socket */
  98 extern int control_fd;
  99
 100 /*
 101  * Name of the host we are connecting to.  This is the name given on the
 102  * command line, or the HostName specified for the user-supplied name in a
 103  * configuration file.
 104  */
 105 extern char *host;
 106
 107 /*
 108  * Flag to indicate that we have received a window change signal which has
 109  * not yet been processed.  This will cause a message indicating the new
 110  * window size to be sent to the server a little later.  This is volatile
 111  * because this is updated in a signal handler.
 112  */
 113 static volatile sig_atomic_t received_window_change_signal = 0;
 114 static volatile sig_atomic_t received_signal = 0;
 115
 116 /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
 117 static int in_non_blocking_mode = 0;
 118
 119 /* Common data for the client loop code. */
 120 static int quit_pending;        /* Set to non-zero to quit the client loop. */
 121 static int escape_char;         /* Escape character. */
 122 static int escape_pending;      /* Last character was the escape character */
 123 static int last_was_cr;         /* Last character was a newline. */
 124 static int exit_status;         /* Used to store the exit status of the command. */
 125 static int stdin_eof;           /* EOF has been encountered on standard error. */
 126 static Buffer stdin_buffer;     /* Buffer for stdin data. */
 127 static Buffer stdout_buffer;    /* Buffer for stdout data. */
 128 static Buffer stderr_buffer;    /* Buffer for stderr data. */
 129 static u_long stdin_bytes, stdout_bytes, stderr_bytes;
 130 static u_int buffer_high;/* Soft max buffer size. */
 131 static int connection_in;       /* Connection to server (input). */
 132 static int connection_out;      /* Connection to server (output). */
 133 static int need_rekeying;       /* Set to non-zero if rekeying is requested. */
 134 static int session_closed = 0;  /* In SSH2: login session closed. */
 135 static int server_alive_timeouts = 0;
 136
 137 static void client_init_dispatch(void);
 138 int     session_ident = -1;
 139
 140 struct confirm_ctx {
 141         int want_tty;
 142         int want_subsys;
 143         int want_x_fwd;
 144         int want_agent_fwd;
 145         Buffer cmd;
 146         char *term;
 147         struct termios tio;
 148         char **env;
 149 };
 150
 151 /*XXX*/
 152 extern Kex *xxx_kex;
 153
 154 void ssh_process_session2_setup(int, int, int, Buffer *);
 155
 156 /* Restores stdin to blocking mode. */
 157
 158 static void
 159 leave_non_blocking(void)
 160 {
 161         if (in_non_blocking_mode) {
 162                 unset_nonblock(fileno(stdin));
 163                 in_non_blocking_mode = 0;
 164         }
 165 }
 166
 167 /* Puts stdin terminal in non-blocking mode. */
 168
 169 static void
 170 enter_non_blocking(void)
 171 {
 172         in_non_blocking_mode = 1;
 173         set_nonblock(fileno(stdin));
 174 }
 175
 176 /*
 177  * Signal handler for the window change signal (SIGWINCH).  This just sets a
 178  * flag indicating that the window has changed.
 179  */
 180
 181 static void
 182 window_change_handler(int sig)
 183 {
 184         received_window_change_signal = 1;
 185         signal(SIGWINCH, window_change_handler);
 186 }
 187
 188 /*
 189  * Signal handler for signals that cause the program to terminate.  These
 190  * signals must be trapped to restore terminal modes.
 191  */
 192
 193 static void
 194 signal_handler(int sig)
 195 {
 196         received_signal = sig;
 197         quit_pending = 1;
 198 }
 199
 200 /*
 201  * Returns current time in seconds from Jan 1, 1970 with the maximum
 202  * available resolution.
 203  */
 204
 205 static double
 206 get_current_time(void)
 207 {
 208         struct timeval tv;
 209         gettimeofday(&tv, NULL);
 210         return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
 211 }
 212
 213 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
 214 void
 215 client_x11_get_proto(const char *display, const char *xauth_path,
 216     u_int trusted, char **_proto, char **_data)
 217 {
 218         char cmd[1024];
 219         char line[512];
 220         char xdisplay[512];
 221         static char proto[512], data[512];
 222         FILE *f;
 223         int got_data = 0, generated = 0, do_unlink = 0, i;
 224         char *xauthdir, *xauthfile;
 225         struct stat st;
 226
 227         xauthdir = xauthfile = NULL;
 228         *_proto = proto;
 229         *_data = data;
 230         proto[0] = data[0] = '\0';
 231
 232         if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
 233                 debug("No xauth program.");
 234         } else {
 235                 if (display == NULL) {
 236                         debug("x11_get_proto: DISPLAY not set");
 237                         return;
 238                 }
 239                 /*
 240                  * Handle FamilyLocal case where $DISPLAY does
 241                  * not match an authorization entry.  For this we
 242                  * just try "xauth list unix:displaynum.screennum".
 243                  * XXX: "localhost" match to determine FamilyLocal
 244                  *      is not perfect.
 245                  */
 246                 if (strncmp(display, "localhost:", 10) == 0) {
 247                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
 248                             display + 10);
 249                         display = xdisplay;
 250                 }
 251                 if (trusted == 0) {
 252                         xauthdir = xmalloc(MAXPATHLEN);
 253                         xauthfile = xmalloc(MAXPATHLEN);
 254                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
 255                         if (mkdtemp(xauthdir) != NULL) {
 256                                 do_unlink = 1;
 257                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
 258                                     xauthdir);
 259                                 snprintf(cmd, sizeof(cmd),
 260                                     "%s -f %s generate %s " SSH_X11_PROTO
 261                                     " untrusted timeout 1200 2>" _PATH_DEVNULL,
 262                                     xauth_path, xauthfile, display);
 263                                 debug2("x11_get_proto: %s", cmd);
 264                                 if (system(cmd) == 0)
 265                                         generated = 1;
 266                         }
 267                 }
 268                 snprintf(cmd, sizeof(cmd),
 269                     "%s %s%s list %s . 2>" _PATH_DEVNULL,
 270                     xauth_path,
 271                     generated ? "-f " : "" ,
 272                     generated ? xauthfile : "",
 273                     display);
 274                 debug2("x11_get_proto: %s", cmd);
 275                 f = popen(cmd, "r");
 276                 if (f && fgets(line, sizeof(line), f) &&
 277                     sscanf(line, "%*s %511s %511s", proto, data) == 2)
 278                         got_data = 1;
 279                 if (f)
 280                         pclose(f);
 281         }
 282
 283         if (do_unlink) {
 284                 unlink(xauthfile);
 285                 rmdir(xauthdir);
 286         }
 287         if (xauthdir)
 288                 xfree(xauthdir);
 289         if (xauthfile)
 290                 xfree(xauthfile);
 291
 292         /*
 293          * If we didn't get authentication data, just make up some
 294          * data.  The forwarding code will check the validity of the
 295          * response anyway, and substitute this data.  The X11
 296          * server, however, will ignore this fake data and use
 297          * whatever authentication mechanisms it was using otherwise
 298          * for the local connection.
 299          */
 300         if (!got_data) {
 301                 u_int32_t rnd = 0;
 302
 303                 logit("Warning: No xauth data; "
 304                     "using fake authentication data for X11 forwarding.");
 305                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
 306                 for (i = 0; i < 16; i++) {
 307                         if (i % 4 == 0)
 308                                 rnd = arc4random();
 309                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
 310                             rnd & 0xff);
 311                         rnd >>= 8;
 312                 }
 313         }
 314 }
 315
 316 /*
 317  * This is called when the interactive is entered.  This checks if there is
 318  * an EOF coming on stdin.  We must check this explicitly, as select() does
 319  * not appear to wake up when redirecting from /dev/null.
 320  */
 321
 322 static void
 323 client_check_initial_eof_on_stdin(void)
 324 {
 325         int len;
 326         char buf[1];
 327
 328         /*
 329          * If standard input is to be "redirected from /dev/null", we simply
 330          * mark that we have seen an EOF and send an EOF message to the
 331          * server. Otherwise, we try to read a single character; it appears
 332          * that for some files, such /dev/null, select() never wakes up for
 333          * read for this descriptor, which means that we never get EOF.  This
 334          * way we will get the EOF if stdin comes from /dev/null or similar.
 335          */
 336         if (stdin_null_flag) {
 337                 /* Fake EOF on stdin. */
 338                 debug("Sending eof.");
 339                 stdin_eof = 1;
 340                 packet_start(SSH_CMSG_EOF);
 341                 packet_send();
 342         } else {
 343                 enter_non_blocking();
 344
 345                 /* Check for immediate EOF on stdin. */
 346                 len = read(fileno(stdin), buf, 1);
 347                 if (len == 0) {
 348                         /* EOF.  Record that we have seen it and send EOF to server. */
 349                         debug("Sending eof.");
 350                         stdin_eof = 1;
 351                         packet_start(SSH_CMSG_EOF);
 352                         packet_send();
 353                 } else if (len > 0) {
 354                         /*
 355                          * Got data.  We must store the data in the buffer,
 356                          * and also process it as an escape character if
 357                          * appropriate.
 358                          */
 359                         if ((u_char) buf[0] == escape_char)
 360                                 escape_pending = 1;
 361                         else
 362                                 buffer_append(&stdin_buffer, buf, 1);
 363                 }
 364                 leave_non_blocking();
 365         }
 366 }
 367
 368
 369 /*
 370  * Make packets from buffered stdin data, and buffer them for sending to the
 371  * connection.
 372  */
 373
 374 static void
 375 client_make_packets_from_stdin_data(void)
 376 {
 377         u_int len;
 378
 379         /* Send buffered stdin data to the server. */
 380         while (buffer_len(&stdin_buffer) > 0 &&
 381             packet_not_very_much_data_to_write()) {
 382                 len = buffer_len(&stdin_buffer);
 383                 /* Keep the packets at reasonable size. */
 384                 if (len > packet_get_maxsize())
 385                         len = packet_get_maxsize();
 386                 packet_start(SSH_CMSG_STDIN_DATA);
 387                 packet_put_string(buffer_ptr(&stdin_buffer), len);
 388                 packet_send();
 389                 buffer_consume(&stdin_buffer, len);
 390                 stdin_bytes += len;
 391                 /* If we have a pending EOF, send it now. */
 392                 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
 393                         packet_start(SSH_CMSG_EOF);
 394                         packet_send();
 395                 }
 396         }
 397 }
 398
 399 /*
 400  * Checks if the client window has changed, and sends a packet about it to
 401  * the server if so.  The actual change is detected elsewhere (by a software
 402  * interrupt on Unix); this just checks the flag and sends a message if
 403  * appropriate.
 404  */
 405
 406 static void
 407 client_check_window_change(void)
 408 {
 409         struct winsize ws;
 410
 411         if (! received_window_change_signal)
 412                 return;
 413         /** XXX race */
 414         received_window_change_signal = 0;
 415
 416         debug2("client_check_window_change: changed");
 417
 418         if (compat20) {
 419                 channel_send_window_changes();
 420         } else {
 421                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
 422                         return;
 423                 packet_start(SSH_CMSG_WINDOW_SIZE);
 424                 packet_put_int(ws.ws_row);
 425                 packet_put_int(ws.ws_col);
 426                 packet_put_int(ws.ws_xpixel);
 427                 packet_put_int(ws.ws_ypixel);
 428                 packet_send();
 429         }
 430 }
 431
 432 static void
 433 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
 434 {
 435         server_alive_timeouts = 0;
 436         client_global_request_reply_fwd(type, seq, ctxt);
 437 }
 438
 439 static void
 440 server_alive_check(void)
 441 {
 442         if (++server_alive_timeouts > options.server_alive_count_max)
 443                 packet_disconnect("Timeout, server not responding.");
 444         packet_start(SSH2_MSG_GLOBAL_REQUEST);
 445         packet_put_cstring("keepalive@openssh.com");
 446         packet_put_char(1);     /* boolean: want reply */
 447         packet_send();
 448 }
 449
 450 /*
 451  * Waits until the client can do something (some data becomes available on
 452  * one of the file descriptors).
 453  */
 454 static void
 455 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
 456     int *maxfdp, u_int *nallocp, int rekeying)
 457 {
 458         struct timeval tv, *tvp;
 459         int ret;
 460
 461         /* Add any selections by the channel mechanism. */
 462         channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
 463
 464         if (!compat20) {
 465                 /* Read from the connection, unless our buffers are full. */
 466                 if (buffer_len(&stdout_buffer) < buffer_high &&
 467                     buffer_len(&stderr_buffer) < buffer_high &&
 468                     channel_not_very_much_buffered_data())
 469                         FD_SET(connection_in, *readsetp);
 470                 /*
 471                  * Read from stdin, unless we have seen EOF or have very much
 472                  * buffered data to send to the server.
 473                  */
 474                 if (!stdin_eof && packet_not_very_much_data_to_write())
 475                         FD_SET(fileno(stdin), *readsetp);
 476
 477                 /* Select stdout/stderr if have data in buffer. */
 478                 if (buffer_len(&stdout_buffer) > 0)
 479                         FD_SET(fileno(stdout), *writesetp);
 480                 if (buffer_len(&stderr_buffer) > 0)
 481                         FD_SET(fileno(stderr), *writesetp);
 482         } else {
 483                 /* channel_prepare_select could have closed the last channel */
 484                 if (session_closed && !channel_still_open() &&
 485                     !packet_have_data_to_write()) {
 486                         /* clear mask since we did not call select() */
 487                         memset(*readsetp, 0, *nallocp);
 488                         memset(*writesetp, 0, *nallocp);
 489                         return;
 490                 } else {
 491                         FD_SET(connection_in, *readsetp);
 492                 }
 493         }
 494
 495         /* Select server connection if have data to write to the server. */
 496         if (packet_have_data_to_write())
 497                 FD_SET(connection_out, *writesetp);
 498
 499         if (control_fd != -1)
 500                 FD_SET(control_fd, *readsetp);
 501
 502         /*
 503          * Wait for something to happen.  This will suspend the process until
 504          * some selected descriptor can be read, written, or has some other
 505          * event pending.
 506          */
 507
 508         if (options.server_alive_interval == 0 || !compat20)
 509                 tvp = NULL;
 510         else {
 511                 tv.tv_sec = options.server_alive_interval;
 512                 tv.tv_usec = 0;
 513                 tvp = &tv;
 514         }
 515         ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
 516         if (ret < 0) {
 517                 char buf[100];
 518
 519                 /*
 520                  * We have to clear the select masks, because we return.
 521                  * We have to return, because the mainloop checks for the flags
 522                  * set by the signal handlers.
 523                  */
 524                 memset(*readsetp, 0, *nallocp);
 525                 memset(*writesetp, 0, *nallocp);
 526
 527                 if (errno == EINTR)
 528                         return;
 529                 /* Note: we might still have data in the buffers. */
 530                 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
 531                 buffer_append(&stderr_buffer, buf, strlen(buf));
 532                 quit_pending = 1;
 533         } else if (ret == 0)
 534                 server_alive_check();
 535 }
 536
 537 static void
 538 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
 539 {
 540         /* Flush stdout and stderr buffers. */
 541         if (buffer_len(bout) > 0)
 542                 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
 543         if (buffer_len(berr) > 0)
 544                 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
 545
 546         leave_raw_mode();
 547
 548         /*
 549          * Free (and clear) the buffer to reduce the amount of data that gets
 550          * written to swap.
 551          */
 552         buffer_free(bin);
 553         buffer_free(bout);
 554         buffer_free(berr);
 555
 556         /* Send the suspend signal to the program itself. */
 557         kill(getpid(), SIGTSTP);
 558
 559         /* Reset window sizes in case they have changed */
 560         received_window_change_signal = 1;
 561
 562         /* OK, we have been continued by the user. Reinitialize buffers. */
 563         buffer_init(bin);
 564         buffer_init(bout);
 565         buffer_init(berr);
 566
 567         enter_raw_mode();
 568 }
 569
 570 static void
 571 client_process_net_input(fd_set * readset)
 572 {
 573         int len;
 574         char buf[8192];
 575
 576         /*
 577          * Read input from the server, and add any such data to the buffer of
 578          * the packet subsystem.
 579          */
 580         if (FD_ISSET(connection_in, readset)) {
 581                 /* Read as much as possible. */
 582                 len = read(connection_in, buf, sizeof(buf));
 583                 if (len == 0) {
 584                         /* Received EOF.  The remote host has closed the connection. */
 585                         snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
 586                                  host);
 587                         buffer_append(&stderr_buffer, buf, strlen(buf));
 588                         quit_pending = 1;
 589                         return;
 590                 }
 591                 /*
 592                  * There is a kernel bug on Solaris that causes select to
 593                  * sometimes wake up even though there is no data available.
 594                  */
 595                 if (len < 0 && (errno == EAGAIN || errno == EINTR))
 596                         len = 0;
 597
 598                 if (len < 0) {
 599                         /* An error has encountered.  Perhaps there is a network problem. */
 600                         snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
 601                                  host, strerror(errno));
 602                         buffer_append(&stderr_buffer, buf, strlen(buf));
 603                         quit_pending = 1;
 604                         return;
 605                 }
 606                 packet_process_incoming(buf, len);
 607         }
 608 }
 609
 610 static void
 611 client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
 612 {
 613         int id;
 614         Channel *c;
 615
 616         id = packet_get_int();
 617         packet_check_eom();
 618
 619         if ((c = channel_lookup(id)) == NULL) {
 620                 error("%s: no channel for id %d", __func__, id);
 621                 return;
 622         }
 623
 624         if (type == SSH2_MSG_CHANNEL_SUCCESS)
 625                 debug2("Request suceeded on channel %d", id);
 626         else if (type == SSH2_MSG_CHANNEL_FAILURE) {
 627                 error("Request failed on channel %d", id);
 628                 channel_free(c);
 629         }
 630 }
 631
 632 static void
 633 client_extra_session2_setup(int id, void *arg)
 634 {
 635         struct confirm_ctx *cctx = arg;
 636         const char *display;
 637         Channel *c;
 638         int i;
 639
 640         if (cctx == NULL)
 641                 fatal("%s: cctx == NULL", __func__);
 642         if ((c = channel_lookup(id)) == NULL)
 643                 fatal("%s: no channel for id %d", __func__, id);
 644
 645         display = getenv("DISPLAY");
 646         if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
 647                 char *proto, *data;
 648                 /* Get reasonable local authentication information. */
 649                 client_x11_get_proto(display, options.xauth_location,
 650                     options.forward_x11_trusted, &proto, &data);
 651                 /* Request forwarding with authentication spoofing. */
 652                 debug("Requesting X11 forwarding with authentication spoofing.");
 653                 x11_request_forwarding_with_spoofing(id, display, proto, data);
 654                 /* XXX wait for reply */
 655         }
 656
 657         if (cctx->want_agent_fwd && options.forward_agent) {
 658                 debug("Requesting authentication agent forwarding.");
 659                 channel_request_start(id, "auth-agent-req@openssh.com", 0);
 660                 packet_send();
 661         }
 662
 663         client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
 664             cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
 665             client_subsystem_reply);
 666
 667         c->confirm_ctx = NULL;
 668         buffer_free(&cctx->cmd);
 669         xfree(cctx->term);
 670         if (cctx->env != NULL) {
 671                 for (i = 0; cctx->env[i] != NULL; i++)
 672                         xfree(cctx->env[i]);
 673                 xfree(cctx->env);
 674         }
 675         xfree(cctx);
 676 }
 677
 678 static void
 679 client_process_control(fd_set * readset)
 680 {
 681         Buffer m;
 682         Channel *c;
 683         int client_fd, new_fd[3], ver, allowed;
 684         socklen_t addrlen;
 685         struct sockaddr_storage addr;
 686         struct confirm_ctx *cctx;
 687         char *cmd;
 688         u_int i, len, env_len, command, flags;
 689         uid_t euid;
 690         gid_t egid;
 691
 692         /*
 693          * Accept connection on control socket
 694          */
 695         if (control_fd == -1 || !FD_ISSET(control_fd, readset))
 696                 return;
 697
 698         memset(&addr, 0, sizeof(addr));
 699         addrlen = sizeof(addr);
 700         if ((client_fd = accept(control_fd,
 701             (struct sockaddr*)&addr, &addrlen)) == -1) {
 702                 error("%s accept: %s", __func__, strerror(errno));
 703                 return;
 704         }
 705
 706         if (getpeereid(client_fd, &euid, &egid) < 0) {
 707                 error("%s getpeereid failed: %s", __func__, strerror(errno));
 708                 close(client_fd);
 709                 return;
 710         }
 711         if ((euid != 0) && (getuid() != euid)) {
 712                 error("control mode uid mismatch: peer euid %u != uid %u",
 713                     (u_int) euid, (u_int) getuid());
 714                 close(client_fd);
 715                 return;
 716         }
 717
 718         unset_nonblock(client_fd);
 719
 720         /* Read command */
 721         buffer_init(&m);
 722         if (ssh_msg_recv(client_fd, &m) == -1) {
 723                 error("%s: client msg_recv failed", __func__);
 724                 close(client_fd);
 725                 buffer_free(&m);
 726                 return;
 727         }
 728         if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
 729                 error("%s: wrong client version %d", __func__, ver);
 730                 buffer_free(&m);
 731                 close(client_fd);
 732                 return;
 733         }
 734
 735         allowed = 1;
 736         command = buffer_get_int(&m);
 737         flags = buffer_get_int(&m);
 738
 739         buffer_clear(&m);
 740
 741         switch (command) {
 742         case SSHMUX_COMMAND_OPEN:
 743                 if (options.control_master == SSHCTL_MASTER_ASK ||
 744                     options.control_master == SSHCTL_MASTER_AUTO_ASK)
 745                         allowed = ask_permission("Allow shared connection "
 746                             "to %s? ", host);
 747                 /* continue below */
 748                 break;
 749         case SSHMUX_COMMAND_TERMINATE:
 750                 if (options.control_master == SSHCTL_MASTER_ASK ||
 751                     options.control_master == SSHCTL_MASTER_AUTO_ASK)
 752                         allowed = ask_permission("Terminate shared connection "
 753                             "to %s? ", host);
 754                 if (allowed)
 755                         quit_pending = 1;
 756                 /* FALLTHROUGH */
 757         case SSHMUX_COMMAND_ALIVE_CHECK:
 758                 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
 759                 buffer_clear(&m);
 760                 buffer_put_int(&m, allowed);
 761                 buffer_put_int(&m, getpid());
 762                 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
 763                         error("%s: client msg_send failed", __func__);
 764                         close(client_fd);
 765                         buffer_free(&m);
 766                         return;
 767                 }
 768                 buffer_free(&m);
 769                 close(client_fd);
 770                 return;
 771         default:
 772                 error("Unsupported command %d", command);
 773                 buffer_free(&m);
 774                 close(client_fd);
 775                 return;
 776         }
 777
 778         /* Reply for SSHMUX_COMMAND_OPEN */
 779         buffer_clear(&m);
 780         buffer_put_int(&m, allowed);
 781         buffer_put_int(&m, getpid());
 782         if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
 783                 error("%s: client msg_send failed", __func__);
 784                 close(client_fd);
 785                 buffer_free(&m);
 786                 return;
 787         }
 788
 789         if (!allowed) {
 790                 error("Refused control connection");
 791                 close(client_fd);
 792                 buffer_free(&m);
 793                 return;
 794         }
 795
 796         buffer_clear(&m);
 797         if (ssh_msg_recv(client_fd, &m) == -1) {
 798                 error("%s: client msg_recv failed", __func__);
 799                 close(client_fd);
 800                 buffer_free(&m);
 801                 return;
 802         }
 803         if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
 804                 error("%s: wrong client version %d", __func__, ver);
 805                 buffer_free(&m);
 806                 close(client_fd);
 807                 return;
 808         }
 809
 810         cctx = xmalloc(sizeof(*cctx));
 811         memset(cctx, 0, sizeof(*cctx));
 812         cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
 813         cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
 814         cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
 815         cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
 816         cctx->term = buffer_get_string(&m, &len);
 817
 818         cmd = buffer_get_string(&m, &len);
 819         buffer_init(&cctx->cmd);
 820         buffer_append(&cctx->cmd, cmd, strlen(cmd));
 821
 822         env_len = buffer_get_int(&m);
 823         env_len = MIN(env_len, 4096);
 824         debug3("%s: receiving %d env vars", __func__, env_len);
 825         if (env_len != 0) {
 826                 cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
 827                 for (i = 0; i < env_len; i++)
 828                         cctx->env[i] = buffer_get_string(&m, &len);
 829                 cctx->env[i] = NULL;
 830         }
 831
 832         debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
 833             cctx->want_tty, cctx->want_subsys, cmd);
 834
 835         /* Gather fds from client */
 836         new_fd[0] = mm_receive_fd(client_fd);
 837         new_fd[1] = mm_receive_fd(client_fd);
 838         new_fd[2] = mm_receive_fd(client_fd);
 839
 840         debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
 841             new_fd[0], new_fd[1], new_fd[2]);
 842
 843         /* Try to pick up ttymodes from client before it goes raw */
 844         if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
 845                 error("%s: tcgetattr: %s", __func__, strerror(errno));
 846
 847         /* This roundtrip is just for synchronisation of ttymodes */
 848         buffer_clear(&m);
 849         if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
 850                 error("%s: client msg_send failed", __func__);
 851                 close(client_fd);
 852                 close(new_fd[0]);
 853                 close(new_fd[1]);
 854                 close(new_fd[2]);
 855                 buffer_free(&m);
 856                 xfree(cctx->term);
 857                 if (env_len != 0) {
 858                         for (i = 0; i < env_len; i++)
 859                                 xfree(cctx->env[i]);
 860                         xfree(cctx->env);
 861                 }
 862                 return;
 863         }
 864         buffer_free(&m);
 865
 866         /* enable nonblocking unless tty */
 867         if (!isatty(new_fd[0]))
 868                 set_nonblock(new_fd[0]);
 869         if (!isatty(new_fd[1]))
 870                 set_nonblock(new_fd[1]);
 871         if (!isatty(new_fd[2]))
 872                 set_nonblock(new_fd[2]);
 873
 874         set_nonblock(client_fd);
 875
 876         c = channel_new("session", SSH_CHANNEL_OPENING,
 877             new_fd[0], new_fd[1], new_fd[2],
 878             CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
 879             CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
 880
 881         /* XXX */
 882         c->ctl_fd = client_fd;
 883
 884         debug3("%s: channel_new: %d", __func__, c->self);
 885
 886         channel_send_open(c->self);
 887         channel_register_confirm(c->self, client_extra_session2_setup, cctx);
 888 }
 889
 890 static void
 891 process_cmdline(void)
 892 {
 893         void (*handler)(int);
 894         char *s, *cmd, *cancel_host;
 895         int delete = 0;
 896         int local = 0;
 897         u_short cancel_port;
 898         Forward fwd;
 899
 900         leave_raw_mode();
 901         handler = signal(SIGINT, SIG_IGN);
 902         cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
 903         if (s == NULL)
 904                 goto out;
 905         while (*s && isspace(*s))
 906                 s++;
 907         if (*s == '-')
 908                 s++;    /* Skip cmdline '-', if any */
 909         if (*s == '\0')
 910                 goto out;
 911
 912         if (*s == 'h' || *s == 'H' || *s == '?') {
 913                 logit("Commands:");
 914                 logit("      -Lport:host:hostport    Request local forward");
 915                 logit("      -Rport:host:hostport    Request remote forward");
 916                 logit("      -KRhostport             Cancel remote forward");
 917                 goto out;
 918         }
 919
 920         if (*s == 'K') {
 921                 delete = 1;
 922                 s++;
 923         }
 924         if (*s != 'L' && *s != 'R') {
 925                 logit("Invalid command.");
 926                 goto out;
 927         }
 928         if (*s == 'L')
 929                 local = 1;
 930         if (local && delete) {
 931                 logit("Not supported.");
 932                 goto out;
 933         }
 934         if ((!local || delete) && !compat20) {
 935                 logit("Not supported for SSH protocol version 1.");
 936                 goto out;
 937         }
 938
 939         s++;
 940         while (*s && isspace(*s))
 941                 s++;
 942
 943         if (delete) {
 944                 cancel_port = 0;
 945                 cancel_host = hpdelim(&s);      /* may be NULL */
 946                 if (s != NULL) {
 947                         cancel_port = a2port(s);
 948                         cancel_host = cleanhostname(cancel_host);
 949                 } else {
 950                         cancel_port = a2port(cancel_host);
 951                         cancel_host = NULL;
 952                 }
 953                 if (cancel_port == 0) {
 954                         logit("Bad forwarding close port");
 955                         goto out;
 956                 }
 957                 channel_request_rforward_cancel(cancel_host, cancel_port);
 958         } else {
 959                 if (!parse_forward(&fwd, s)) {
 960                         logit("Bad forwarding specification.");
 961                         goto out;
 962                 }
 963                 if (local) {
 964                         if (channel_setup_local_fwd_listener(fwd.listen_host,
 965                             fwd.listen_port, fwd.connect_host,
 966                             fwd.connect_port, options.gateway_ports) < 0) {
 967                                 logit("Port forwarding failed.");
 968                                 goto out;
 969                         }
 970                 } else {
 971                         channel_request_remote_forwarding(fwd.listen_host,
 972                             fwd.listen_port, fwd.connect_host,
 973                             fwd.connect_port);
 974                 }
 975
 976                 logit("Forwarding port.");
 977         }
 978
 979 out:
 980         signal(SIGINT, handler);
 981         enter_raw_mode();
 982         if (cmd)
 983                 xfree(cmd);
 984 }
 985
 986 /* process the characters one by one */
 987 static int
 988 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
 989 {
 990         char string[1024];
 991         pid_t pid;
 992         int bytes = 0;
 993         u_int i;
 994         u_char ch;
 995         char *s;
 996
 997         if (len <= 0)
 998                 return (0);
 999
1000         for (i = 0; i < (u_int)len; i++) {
1001                 /* Get one character at a time. */
1002                 ch = buf[i];
1003
1004                 if (escape_pending) {
1005                         /* We have previously seen an escape character. */
1006                         /* Clear the flag now. */
1007                         escape_pending = 0;
1008
1009                         /* Process the escaped character. */
1010                         switch (ch) {
1011                         case '.':
1012                                 /* Terminate the connection. */
1013                                 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1014                                 buffer_append(berr, string, strlen(string));
1015
1016                                 quit_pending = 1;
1017                                 return -1;
1018
1019                         case 'Z' - 64:
1020                                 /* Suspend the program. */
1021                                 /* Print a message to that effect to the user. */
1022                                 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1023                                 buffer_append(berr, string, strlen(string));
1024
1025                                 /* Restore terminal modes and suspend. */
1026                                 client_suspend_self(bin, bout, berr);
1027
1028                                 /* We have been continued. */
1029                                 continue;
1030
1031                         case 'B':
1032                                 if (compat20) {
1033                                         snprintf(string, sizeof string,
1034                                             "%cB\r\n", escape_char);
1035                                         buffer_append(berr, string,
1036                                             strlen(string));
1037                                         channel_request_start(session_ident,
1038                                             "break", 0);
1039                                         packet_put_int(1000);
1040                                         packet_send();
1041                                 }
1042                                 continue;
1043
1044                         case 'R':
1045                                 if (compat20) {
1046                                         if (datafellows & SSH_BUG_NOREKEY)
1047                                                 logit("Server does not support re-keying");
1048                                         else
1049                                                 need_rekeying = 1;
1050                                 }
1051                                 continue;
1052
1053                         case '&':
1054                                 /*
1055                                  * Detach the program (continue to serve connections,
1056                                  * but put in background and no more new connections).
1057                                  */
1058                                 /* Restore tty modes. */
1059                                 leave_raw_mode();
1060
1061                                 /* Stop listening for new connections. */
1062                                 channel_stop_listening();
1063
1064                                 snprintf(string, sizeof string,
1065                                     "%c& [backgrounded]\n", escape_char);
1066                                 buffer_append(berr, string, strlen(string));
1067
1068                                 /* Fork into background. */
1069                                 pid = fork();
1070                                 if (pid < 0) {
1071                                         error("fork: %.100s", strerror(errno));
1072                                         continue;
1073                                 }
1074                                 if (pid != 0) { /* This is the parent. */
1075                                         /* The parent just exits. */
1076                                         exit(0);
1077                                 }
1078                                 /* The child continues serving connections. */
1079                                 if (compat20) {
1080                                         buffer_append(bin, "\004", 1);
1081                                         /* fake EOF on stdin */
1082                                         return -1;
1083                                 } else if (!stdin_eof) {
1084                                         /*
1085                                          * Sending SSH_CMSG_EOF alone does not always appear
1086                                          * to be enough.  So we try to send an EOF character
1087                                          * first.
1088                                          */
1089                                         packet_start(SSH_CMSG_STDIN_DATA);
1090                                         packet_put_string("\004", 1);
1091                                         packet_send();
1092                                         /* Close stdin. */
1093                                         stdin_eof = 1;
1094                                         if (buffer_len(bin) == 0) {
1095                                                 packet_start(SSH_CMSG_EOF);
1096                                                 packet_send();
1097                                         }
1098                                 }
1099                                 continue;
1100
1101                         case '?':
1102                                 snprintf(string, sizeof string,
1103 "%c?\r\n\
1104 Supported escape sequences:\r\n\
1105 %c.  - terminate connection\r\n\
1106 %cB  - send a BREAK to the remote system\r\n\
1107 %cC  - open a command line\r\n\
1108 %cR  - Request rekey (SSH protocol 2 only)\r\n\
1109 %c^Z - suspend ssh\r\n\
1110 %c#  - list forwarded connections\r\n\
1111 %c&  - background ssh (when waiting for connections to terminate)\r\n\
1112 %c?  - this message\r\n\
1113 %c%c  - send the escape character by typing it twice\r\n\
1114 (Note that escapes are only recognized immediately after newline.)\r\n",
1115                                     escape_char, escape_char, escape_char, escape_char,
1116                                     escape_char, escape_char, escape_char, escape_char,
1117                                     escape_char, escape_char, escape_char);
1118                                 buffer_append(berr, string, strlen(string));
1119                                 continue;
1120
1121                         case '#':
1122                                 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1123                                 buffer_append(berr, string, strlen(string));
1124                                 s = channel_open_message();
1125                                 buffer_append(berr, s, strlen(s));
1126                                 xfree(s);
1127                                 continue;
1128
1129                         case 'C':
1130                                 process_cmdline();
1131                                 continue;
1132
1133                         default:
1134                                 if (ch != escape_char) {
1135                                         buffer_put_char(bin, escape_char);
1136                                         bytes++;
1137                                 }
1138                                 /* Escaped characters fall through here */
1139                                 break;
1140                         }
1141                 } else {
1142                         /*
1143                          * The previous character was not an escape char. Check if this
1144                          * is an escape.
1145                          */
1146                         if (last_was_cr && ch == escape_char) {
1147                                 /* It is. Set the flag and continue to next character. */
1148                                 escape_pending = 1;
1149                                 continue;
1150                         }
1151                 }
1152
1153                 /*
1154                  * Normal character.  Record whether it was a newline,
1155                  * and append it to the buffer.
1156                  */
1157                 last_was_cr = (ch == '\r' || ch == '\n');
1158                 buffer_put_char(bin, ch);
1159                 bytes++;
1160         }
1161         return bytes;
1162 }
1163
1164 static void
1165 client_process_input(fd_set * readset)
1166 {
1167         int len;
1168         char buf[8192];
1169
1170         /* Read input from stdin. */
1171         if (FD_ISSET(fileno(stdin), readset)) {
1172                 /* Read as much as possible. */
1173                 len = read(fileno(stdin), buf, sizeof(buf));
1174                 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1175                         return;         /* we'll try again later */
1176                 if (len <= 0) {
1177                         /*
1178                          * Received EOF or error.  They are treated
1179                          * similarly, except that an error message is printed
1180                          * if it was an error condition.
1181                          */
1182                         if (len < 0) {
1183                                 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1184                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1185                         }
1186                         /* Mark that we have seen EOF. */
1187                         stdin_eof = 1;
1188                         /*
1189                          * Send an EOF message to the server unless there is
1190                          * data in the buffer.  If there is data in the
1191                          * buffer, no message will be sent now.  Code
1192                          * elsewhere will send the EOF when the buffer
1193                          * becomes empty if stdin_eof is set.
1194                          */
1195                         if (buffer_len(&stdin_buffer) == 0) {
1196                                 packet_start(SSH_CMSG_EOF);
1197                                 packet_send();
1198                         }
1199                 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1200                         /*
1201                          * Normal successful read, and no escape character.
1202                          * Just append the data to buffer.
1203                          */
1204                         buffer_append(&stdin_buffer, buf, len);
1205                 } else {
1206                         /*
1207                          * Normal, successful read.  But we have an escape character
1208                          * and have to process the characters one by one.
1209                          */
1210                         if (process_escapes(&stdin_buffer, &stdout_buffer,
1211                             &stderr_buffer, buf, len) == -1)
1212                                 return;
1213                 }
1214         }
1215 }
1216
1217 static void
1218 client_process_output(fd_set * writeset)
1219 {
1220         int len;
1221         char buf[100];
1222
1223         /* Write buffered output to stdout. */
1224         if (FD_ISSET(fileno(stdout), writeset)) {
1225                 /* Write as much data as possible. */
1226                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1227                     buffer_len(&stdout_buffer));
1228                 if (len <= 0) {
1229                         if (errno == EINTR || errno == EAGAIN)
1230                                 len = 0;
1231                         else {
1232                                 /*
1233                                  * An error or EOF was encountered.  Put an
1234                                  * error message to stderr buffer.
1235                                  */
1236                                 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1237                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1238                                 quit_pending = 1;
1239                                 return;
1240                         }
1241                 }
1242                 /* Consume printed data from the buffer. */
1243                 buffer_consume(&stdout_buffer, len);
1244                 stdout_bytes += len;
1245         }
1246         /* Write buffered output to stderr. */
1247         if (FD_ISSET(fileno(stderr), writeset)) {
1248                 /* Write as much data as possible. */
1249                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1250                     buffer_len(&stderr_buffer));
1251                 if (len <= 0) {
1252                         if (errno == EINTR || errno == EAGAIN)
1253                                 len = 0;
1254                         else {
1255                                 /* EOF or error, but can't even print error message. */
1256                                 quit_pending = 1;
1257                                 return;
1258                         }
1259                 }
1260                 /* Consume printed characters from the buffer. */
1261                 buffer_consume(&stderr_buffer, len);
1262                 stderr_bytes += len;
1263         }
1264 }
1265
1266 /*
1267  * Get packets from the connection input buffer, and process them as long as
1268  * there are packets available.
1269  *
1270  * Any unknown packets received during the actual
1271  * session cause the session to terminate.  This is
1272  * intended to make debugging easier since no
1273  * confirmations are sent.  Any compatible protocol
1274  * extensions must be negotiated during the
1275  * preparatory phase.
1276  */
1277
1278 static void
1279 client_process_buffered_input_packets(void)
1280 {
1281         dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1282 }
1283
1284 /* scan buf[] for '~' before sending data to the peer */
1285
1286 static int
1287 simple_escape_filter(Channel *c, char *buf, int len)
1288 {
1289         /* XXX we assume c->extended is writeable */
1290         return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1291 }
1292
1293 static void
1294 client_channel_closed(int id, void *arg)
1295 {
1296         channel_cancel_cleanup(id);
1297         session_closed = 1;
1298         leave_raw_mode();
1299 }
1300
1301 /*
1302  * Implements the interactive session with the server.  This is called after
1303  * the user has been authenticated, and a command has been started on the
1304  * remote host.  If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1305  * used as an escape character for terminating or suspending the session.
1306  */
1307
1308 int
1309 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1310 {
1311         fd_set *readset = NULL, *writeset = NULL;
1312         double start_time, total_time;
1313         int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1314         u_int nalloc = 0;
1315         char buf[100];
1316
1317         debug("Entering interactive session.");
1318
1319         start_time = get_current_time();
1320
1321         /* Initialize variables. */
1322         escape_pending = 0;
1323         last_was_cr = 1;
1324         exit_status = -1;
1325         stdin_eof = 0;
1326         buffer_high = 64 * 1024;
1327         connection_in = packet_get_connection_in();
1328         connection_out = packet_get_connection_out();
1329         max_fd = MAX(connection_in, connection_out);
1330         if (control_fd != -1)
1331                 max_fd = MAX(max_fd, control_fd);
1332
1333         if (!compat20) {
1334                 /* enable nonblocking unless tty */
1335                 if (!isatty(fileno(stdin)))
1336                         set_nonblock(fileno(stdin));
1337                 if (!isatty(fileno(stdout)))
1338                         set_nonblock(fileno(stdout));
1339                 if (!isatty(fileno(stderr)))
1340                         set_nonblock(fileno(stderr));
1341                 max_fd = MAX(max_fd, fileno(stdin));
1342                 max_fd = MAX(max_fd, fileno(stdout));
1343                 max_fd = MAX(max_fd, fileno(stderr));
1344         }
1345         stdin_bytes = 0;
1346         stdout_bytes = 0;
1347         stderr_bytes = 0;
1348         quit_pending = 0;
1349         escape_char = escape_char_arg;
1350
1351         /* Initialize buffers. */
1352         buffer_init(&stdin_buffer);
1353         buffer_init(&stdout_buffer);
1354         buffer_init(&stderr_buffer);
1355
1356         client_init_dispatch();
1357
1358         /*
1359          * Set signal handlers, (e.g. to restore non-blocking mode)
1360          * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1361          */
1362         if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1363                 signal(SIGHUP, signal_handler);
1364         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1365                 signal(SIGINT, signal_handler);
1366         if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1367                 signal(SIGQUIT, signal_handler);
1368         if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1369                 signal(SIGTERM, signal_handler);
1370         signal(SIGWINCH, window_change_handler);
1371
1372         if (have_pty)
1373                 enter_raw_mode();
1374
1375         if (compat20) {
1376                 session_ident = ssh2_chan_id;
1377                 if (escape_char != SSH_ESCAPECHAR_NONE)
1378                         channel_register_filter(session_ident,
1379                             simple_escape_filter);
1380                 if (session_ident != -1)
1381                         channel_register_cleanup(session_ident,
1382                             client_channel_closed);
1383         } else {
1384                 /* Check if we should immediately send eof on stdin. */
1385                 client_check_initial_eof_on_stdin();
1386         }
1387
1388         /* Main loop of the client for the interactive session mode. */
1389         while (!quit_pending) {
1390
1391                 /* Process buffered packets sent by the server. */
1392                 client_process_buffered_input_packets();
1393
1394                 if (compat20 && session_closed && !channel_still_open())
1395                         break;
1396
1397                 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1398
1399                 if (rekeying) {
1400                         debug("rekeying in progress");
1401                 } else {
1402                         /*
1403                          * Make packets of buffered stdin data, and buffer
1404                          * them for sending to the server.
1405                          */
1406                         if (!compat20)
1407                                 client_make_packets_from_stdin_data();
1408
1409                         /*
1410                          * Make packets from buffered channel data, and
1411                          * enqueue them for sending to the server.
1412                          */
1413                         if (packet_not_very_much_data_to_write())
1414                                 channel_output_poll();
1415
1416                         /*
1417                          * Check if the window size has changed, and buffer a
1418                          * message about it to the server if so.
1419                          */
1420                         client_check_window_change();
1421
1422                         if (quit_pending)
1423                                 break;
1424                 }
1425                 /*
1426                  * Wait until we have something to do (something becomes
1427                  * available on one of the descriptors).
1428                  */
1429                 max_fd2 = max_fd;
1430                 client_wait_until_can_do_something(&readset, &writeset,
1431                     &max_fd2, &nalloc, rekeying);
1432
1433                 if (quit_pending)
1434                         break;
1435
1436                 /* Do channel operations unless rekeying in progress. */
1437                 if (!rekeying) {
1438                         channel_after_select(readset, writeset);
1439                         if (need_rekeying || packet_need_rekeying()) {
1440                                 debug("need rekeying");
1441                                 xxx_kex->done = 0;
1442                                 kex_send_kexinit(xxx_kex);
1443                                 need_rekeying = 0;
1444                         }
1445                 }
1446
1447                 /* Buffer input from the connection.  */
1448                 client_process_net_input(readset);
1449
1450                 /* Accept control connections.  */
1451                 client_process_control(readset);
1452
1453                 if (quit_pending)
1454                         break;
1455
1456                 if (!compat20) {
1457                         /* Buffer data from stdin */
1458                         client_process_input(readset);
1459                         /*
1460                          * Process output to stdout and stderr.  Output to
1461                          * the connection is processed elsewhere (above).
1462                          */
1463                         client_process_output(writeset);
1464                 }
1465
1466                 /* Send as much buffered packet data as possible to the sender. */
1467                 if (FD_ISSET(connection_out, writeset))
1468                         packet_write_poll();
1469         }
1470         if (readset)
1471                 xfree(readset);
1472         if (writeset)
1473                 xfree(writeset);
1474
1475         /* Terminate the session. */
1476
1477         /* Stop watching for window change. */
1478         signal(SIGWINCH, SIG_DFL);
1479
1480         channel_free_all();
1481
1482         if (have_pty)
1483                 leave_raw_mode();
1484
1485         /* restore blocking io */
1486         if (!isatty(fileno(stdin)))
1487                 unset_nonblock(fileno(stdin));
1488         if (!isatty(fileno(stdout)))
1489                 unset_nonblock(fileno(stdout));
1490         if (!isatty(fileno(stderr)))
1491                 unset_nonblock(fileno(stderr));
1492
1493         /*
1494          * If there was no shell or command requested, there will be no remote
1495          * exit status to be returned.  In that case, clear error code if the
1496          * connection was deliberately terminated at this end.
1497          */
1498         if (no_shell_flag && received_signal == SIGTERM) {
1499                 received_signal = 0;
1500                 exit_status = 0;
1501         }
1502
1503         if (received_signal)
1504                 fatal("Killed by signal %d.", (int) received_signal);
1505
1506         /*
1507          * In interactive mode (with pseudo tty) display a message indicating
1508          * that the connection has been closed.
1509          */
1510         if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1511                 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1512                 buffer_append(&stderr_buffer, buf, strlen(buf));
1513         }
1514
1515         /* Output any buffered data for stdout. */
1516         while (buffer_len(&stdout_buffer) > 0) {
1517                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1518                     buffer_len(&stdout_buffer));
1519                 if (len <= 0) {
1520                         error("Write failed flushing stdout buffer.");
1521                         break;
1522                 }
1523                 buffer_consume(&stdout_buffer, len);
1524                 stdout_bytes += len;
1525         }
1526
1527         /* Output any buffered data for stderr. */
1528         while (buffer_len(&stderr_buffer) > 0) {
1529                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1530                     buffer_len(&stderr_buffer));
1531                 if (len <= 0) {
1532                         error("Write failed flushing stderr buffer.");
1533                         break;
1534                 }
1535                 buffer_consume(&stderr_buffer, len);
1536                 stderr_bytes += len;
1537         }
1538
1539         /* Clear and free any buffers. */
1540         memset(buf, 0, sizeof(buf));
1541         buffer_free(&stdin_buffer);
1542         buffer_free(&stdout_buffer);
1543         buffer_free(&stderr_buffer);
1544
1545         /* Report bytes transferred, and transfer rates. */
1546         total_time = get_current_time() - start_time;
1547         debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1548             stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1549         if (total_time > 0)
1550                 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1551                     stdin_bytes / total_time, stdout_bytes / total_time,
1552                     stderr_bytes / total_time);
1553
1554         /* Return the exit status of the program. */
1555         debug("Exit status %d", exit_status);
1556         return exit_status;
1557 }
1558
1559 /*********/
1560
1561 static void
1562 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1563 {
1564         u_int data_len;
1565         char *data = packet_get_string(&data_len);
1566         packet_check_eom();
1567         buffer_append(&stdout_buffer, data, data_len);
1568         memset(data, 0, data_len);
1569         xfree(data);
1570 }
1571 static void
1572 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1573 {
1574         u_int data_len;
1575         char *data = packet_get_string(&data_len);
1576         packet_check_eom();
1577         buffer_append(&stderr_buffer, data, data_len);
1578         memset(data, 0, data_len);
1579         xfree(data);
1580 }
1581 static void
1582 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1583 {
1584         exit_status = packet_get_int();
1585         packet_check_eom();
1586         /* Acknowledge the exit. */
1587         packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1588         packet_send();
1589         /*
1590          * Must wait for packet to be sent since we are
1591          * exiting the loop.
1592          */
1593         packet_write_wait();
1594         /* Flag that we want to exit. */
1595         quit_pending = 1;
1596 }
1597 static void
1598 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1599 {
1600         Channel *c = NULL;
1601         int remote_id, sock;
1602
1603         /* Read the remote channel number from the message. */
1604         remote_id = packet_get_int();
1605         packet_check_eom();
1606
1607         /*
1608          * Get a connection to the local authentication agent (this may again
1609          * get forwarded).
1610          */
1611         sock = ssh_get_authentication_socket();
1612
1613         /*
1614          * If we could not connect the agent, send an error message back to
1615          * the server. This should never happen unless the agent dies,
1616          * because authentication forwarding is only enabled if we have an
1617          * agent.
1618          */
1619         if (sock >= 0) {
1620                 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1621                     -1, 0, 0, 0, "authentication agent connection", 1);
1622                 c->remote_id = remote_id;
1623                 c->force_drain = 1;
1624         }
1625         if (c == NULL) {
1626                 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1627                 packet_put_int(remote_id);
1628         } else {
1629                 /* Send a confirmation to the remote host. */
1630                 debug("Forwarding authentication connection.");
1631                 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1632                 packet_put_int(remote_id);
1633                 packet_put_int(c->self);
1634         }
1635         packet_send();
1636 }
1637
1638 static Channel *
1639 client_request_forwarded_tcpip(const char *request_type, int rchan)
1640 {
1641         Channel *c = NULL;
1642         char *listen_address, *originator_address;
1643         int listen_port, originator_port;
1644         int sock;
1645
1646         /* Get rest of the packet */
1647         listen_address = packet_get_string(NULL);
1648         listen_port = packet_get_int();
1649         originator_address = packet_get_string(NULL);
1650         originator_port = packet_get_int();
1651         packet_check_eom();
1652
1653         debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1654             listen_address, listen_port, originator_address, originator_port);
1655
1656         sock = channel_connect_by_listen_address(listen_port);
1657         if (sock < 0) {
1658                 xfree(originator_address);
1659                 xfree(listen_address);
1660                 return NULL;
1661         }
1662         c = channel_new("forwarded-tcpip",
1663             SSH_CHANNEL_CONNECTING, sock, sock, -1,
1664             CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1665             originator_address, 1);
1666         xfree(originator_address);
1667         xfree(listen_address);
1668         return c;
1669 }
1670
1671 static Channel *
1672 client_request_x11(const char *request_type, int rchan)
1673 {
1674         Channel *c = NULL;
1675         char *originator;
1676         int originator_port;
1677         int sock;
1678
1679         if (!options.forward_x11) {
1680                 error("Warning: ssh server tried X11 forwarding.");
1681                 error("Warning: this is probably a break in attempt by a malicious server.");
1682                 return NULL;
1683         }
1684         originator = packet_get_string(NULL);
1685         if (datafellows & SSH_BUG_X11FWD) {
1686                 debug2("buggy server: x11 request w/o originator_port");
1687                 originator_port = 0;
1688         } else {
1689                 originator_port = packet_get_int();
1690         }
1691         packet_check_eom();
1692         /* XXX check permission */
1693         debug("client_request_x11: request from %s %d", originator,
1694             originator_port);
1695         xfree(originator);
1696         sock = x11_connect_display();
1697         if (sock < 0)
1698                 return NULL;
1699         c = channel_new("x11",
1700             SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1701             CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1702         c->force_drain = 1;
1703         return c;
1704 }
1705
1706 static Channel *
1707 client_request_agent(const char *request_type, int rchan)
1708 {
1709         Channel *c = NULL;
1710         int sock;
1711
1712         if (!options.forward_agent) {
1713                 error("Warning: ssh server tried agent forwarding.");
1714                 error("Warning: this is probably a break in attempt by a malicious server.");
1715                 return NULL;
1716         }
1717         sock =  ssh_get_authentication_socket();
1718         if (sock < 0)
1719                 return NULL;
1720         c = channel_new("authentication agent connection",
1721             SSH_CHANNEL_OPEN, sock, sock, -1,
1722             CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1723             "authentication agent connection", 1);
1724         c->force_drain = 1;
1725         return c;
1726 }
1727
1728 /* XXXX move to generic input handler */
1729 static void
1730 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1731 {
1732         Channel *c = NULL;
1733         char *ctype;
1734         int rchan;
1735         u_int rmaxpack, rwindow, len;
1736
1737         ctype = packet_get_string(&len);
1738         rchan = packet_get_int();
1739         rwindow = packet_get_int();
1740         rmaxpack = packet_get_int();
1741
1742         debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1743             ctype, rchan, rwindow, rmaxpack);
1744
1745         if (strcmp(ctype, "forwarded-tcpip") == 0) {
1746                 c = client_request_forwarded_tcpip(ctype, rchan);
1747         } else if (strcmp(ctype, "x11") == 0) {
1748                 c = client_request_x11(ctype, rchan);
1749         } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1750                 c = client_request_agent(ctype, rchan);
1751         }
1752 /* XXX duplicate : */
1753         if (c != NULL) {
1754                 debug("confirm %s", ctype);
1755                 c->remote_id = rchan;
1756                 c->remote_window = rwindow;
1757                 c->remote_maxpacket = rmaxpack;
1758                 if (c->type != SSH_CHANNEL_CONNECTING) {
1759                         packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1760                         packet_put_int(c->remote_id);
1761                         packet_put_int(c->self);
1762                         packet_put_int(c->local_window);
1763                         packet_put_int(c->local_maxpacket);
1764                         packet_send();
1765                 }
1766         } else {
1767                 debug("failure %s", ctype);
1768                 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1769                 packet_put_int(rchan);
1770                 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1771                 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1772                         packet_put_cstring("open failed");
1773                         packet_put_cstring("");
1774                 }
1775                 packet_send();
1776         }
1777         xfree(ctype);
1778 }
1779 static void
1780 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1781 {
1782         Channel *c = NULL;
1783         int exitval, id, reply, success = 0;
1784         char *rtype;
1785
1786         id = packet_get_int();
1787         rtype = packet_get_string(NULL);
1788         reply = packet_get_char();
1789
1790         debug("client_input_channel_req: channel %d rtype %s reply %d",
1791             id, rtype, reply);
1792
1793         if (id == -1) {
1794                 error("client_input_channel_req: request for channel -1");
1795         } else if ((c = channel_lookup(id)) == NULL) {
1796                 error("client_input_channel_req: channel %d: unknown channel", id);
1797         } else if (strcmp(rtype, "exit-status") == 0) {
1798                 exitval = packet_get_int();
1799                 if (id == session_ident) {
1800                         success = 1;
1801                         exit_status = exitval;
1802                 } else if (c->ctl_fd == -1) {
1803                         error("client_input_channel_req: unexpected channel %d",
1804                             session_ident);
1805                 } else {
1806                         atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1807                         success = 1;
1808                 }
1809                 packet_check_eom();
1810         }
1811         if (reply) {
1812                 packet_start(success ?
1813                     SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1814                 packet_put_int(id);
1815                 packet_send();
1816         }
1817         xfree(rtype);
1818 }
1819 static void
1820 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1821 {
1822         char *rtype;
1823         int want_reply;
1824         int success = 0;
1825
1826         rtype = packet_get_string(NULL);
1827         want_reply = packet_get_char();
1828         debug("client_input_global_request: rtype %s want_reply %d",
1829             rtype, want_reply);
1830         if (want_reply) {
1831                 packet_start(success ?
1832                     SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1833                 packet_send();
1834                 packet_write_wait();
1835         }
1836         xfree(rtype);
1837 }
1838
1839 void
1840 client_session2_setup(int id, int want_tty, int want_subsystem,
1841     const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1842     dispatch_fn *subsys_repl)
1843 {
1844         int len;
1845         Channel *c = NULL;
1846
1847         debug2("%s: id %d", __func__, id);
1848
1849         if ((c = channel_lookup(id)) == NULL)
1850                 fatal("client_session2_setup: channel %d: unknown channel", id);
1851
1852         if (want_tty) {
1853                 struct winsize ws;
1854                 struct termios tio;
1855
1856                 /* Store window size in the packet. */
1857                 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1858                         memset(&ws, 0, sizeof(ws));
1859
1860                 channel_request_start(id, "pty-req", 0);
1861                 packet_put_cstring(term != NULL ? term : "");
1862                 packet_put_int(ws.ws_col);
1863                 packet_put_int(ws.ws_row);
1864                 packet_put_int(ws.ws_xpixel);
1865                 packet_put_int(ws.ws_ypixel);
1866                 tio = get_saved_tio();
1867                 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1868                 packet_send();
1869                 /* XXX wait for reply */
1870                 c->client_tty = 1;
1871         }
1872
1873         /* Transfer any environment variables from client to server */
1874         if (options.num_send_env != 0 && env != NULL) {
1875                 int i, j, matched;
1876                 char *name, *val;
1877
1878                 debug("Sending environment.");
1879                 for (i = 0; env[i] != NULL; i++) {
1880                         /* Split */
1881                         name = xstrdup(env[i]);
1882                         if ((val = strchr(name, '=')) == NULL) {
1883                                 free(name);
1884                                 continue;
1885                         }
1886                         *val++ = '\0';
1887
1888                         matched = 0;
1889                         for (j = 0; j < options.num_send_env; j++) {
1890                                 if (match_pattern(name, options.send_env[j])) {
1891                                         matched = 1;
1892                                         break;
1893                                 }
1894                         }
1895                         if (!matched) {
1896                                 debug3("Ignored env %s", name);
1897                                 free(name);
1898                                 continue;
1899                         }
1900
1901                         debug("Sending env %s = %s", name, val);
1902                         channel_request_start(id, "env", 0);
1903                         packet_put_cstring(name);
1904                         packet_put_cstring(val);
1905                         packet_send();
1906                         free(name);
1907                 }
1908         }
1909
1910         len = buffer_len(cmd);
1911         if (len > 0) {
1912                 if (len > 900)
1913                         len = 900;
1914                 if (want_subsystem) {
1915                         debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1916                         channel_request_start(id, "subsystem", subsys_repl != NULL);
1917                         if (subsys_repl != NULL) {
1918                                 /* register callback for reply */
1919                                 /* XXX we assume that client_loop has already been called */
1920                                 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1921                                 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1922                         }
1923                 } else {
1924                         debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1925                         channel_request_start(id, "exec", 0);
1926                 }
1927                 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1928                 packet_send();
1929         } else {
1930                 channel_request_start(id, "shell", 0);
1931                 packet_send();
1932         }
1933 }
1934
1935 static void
1936 client_init_dispatch_20(void)
1937 {
1938         dispatch_init(&dispatch_protocol_error);
1939
1940         dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1941         dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1942         dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1943         dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1944         dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1945         dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1946         dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1947         dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1948         dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1949         dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1950
1951         /* rekeying */
1952         dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1953
1954         /* global request reply messages */
1955         dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1956         dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1957 }
1958 static void
1959 client_init_dispatch_13(void)
1960 {
1961         dispatch_init(NULL);
1962         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1963         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1964         dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1965         dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1966         dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1967         dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1968         dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1969         dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1970         dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1971
1972         dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1973             &client_input_agent_open : &deny_input_open);
1974         dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1975             &x11_input_open : &deny_input_open);
1976 }
1977 static void
1978 client_init_dispatch_15(void)
1979 {
1980         client_init_dispatch_13();
1981         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1982         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1983 }
1984 static void
1985 client_init_dispatch(void)
1986 {
1987         if (compat20)
1988                 client_init_dispatch_20();
1989         else if (compat13)
1990                 client_init_dispatch_13();
1991         else
1992                 client_init_dispatch_15();
1993 }
1994
1995 /* client specific fatal cleanup */
1996 void
1997 cleanup_exit(int i)
1998 {
1999         leave_raw_mode();
2000         leave_non_blocking();
2001         if (options.control_path != NULL && control_fd != -1)
2002                 unlink(options.control_path);
2003         _exit(i);
2004 }