1 /* $OpenBSD: serverloop.c,v 1.172 2014/07/15 15:54:14 millert Exp $ */ 2 /* 3 * Author: Tatu Ylonen <ylo@cs.hut.fi> 4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 5 * All rights reserved 6 * Server main loop for handling the interactive session. 7 * 8 * As far as I am concerned, the code I have written for this software 9 * can be used freely for any purpose. Any derived versions of this 10 * software must be clearly marked as such, and if the derived work is 11 * incompatible with the protocol description in the RFC file, it must be 12 * called by a name other than "ssh" or "Secure Shell". 13 * 14 * SSH2 support by Markus Friedl. 15 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include "includes.h" 39 40 #include <sys/types.h> 41 #include <sys/param.h> 42 #include <sys/wait.h> 43 #include <sys/socket.h> 44 #ifdef HAVE_SYS_TIME_H 45 # include <sys/time.h> 46 #endif 47 48 #include <netinet/in.h> 49 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <pwd.h> 53 #include <signal.h> 54 #include <string.h> 55 #include <termios.h> 56 #include <unistd.h> 57 #include <stdarg.h> 58 59 #include "openbsd-compat/sys-queue.h" 60 #include "xmalloc.h" 61 #include "packet.h" 62 #include "buffer.h" 63 #include "log.h" 64 #include "misc.h" 65 #include "servconf.h" 66 #include "canohost.h" 67 #include "sshpty.h" 68 #include "channels.h" 69 #include "compat.h" 70 #include "ssh1.h" 71 #include "ssh2.h" 72 #include "key.h" 73 #include "cipher.h" 74 #include "kex.h" 75 #include "hostfile.h" 76 #include "auth.h" 77 #include "session.h" 78 #include "dispatch.h" 79 #include "auth-options.h" 80 #include "serverloop.h" 81 #include "roaming.h" 82 83 extern ServerOptions options; 84 85 /* XXX */ 86 extern Kex *xxx_kex; 87 extern Authctxt *the_authctxt; 88 extern int use_privsep; 89 90 static Buffer stdin_buffer; /* Buffer for stdin data. */ 91 static Buffer stdout_buffer; /* Buffer for stdout data. */ 92 static Buffer stderr_buffer; /* Buffer for stderr data. */ 93 static int fdin; /* Descriptor for stdin (for writing) */ 94 static int fdout; /* Descriptor for stdout (for reading); 95 May be same number as fdin. */ 96 static int fderr; /* Descriptor for stderr. May be -1. */ 97 static u_long stdin_bytes = 0; /* Number of bytes written to stdin. */ 98 static u_long stdout_bytes = 0; /* Number of stdout bytes sent to client. */ 99 static u_long stderr_bytes = 0; /* Number of stderr bytes sent to client. */ 100 static u_long fdout_bytes = 0; /* Number of stdout bytes read from program. */ 101 static int stdin_eof = 0; /* EOF message received from client. */ 102 static int fdout_eof = 0; /* EOF encountered reading from fdout. */ 103 static int fderr_eof = 0; /* EOF encountered readung from fderr. */ 104 static int fdin_is_tty = 0; /* fdin points to a tty. */ 105 static int connection_in; /* Connection to client (input). */ 106 static int connection_out; /* Connection to client (output). */ 107 static int connection_closed = 0; /* Connection to client closed. */ 108 static u_int buffer_high; /* "Soft" max buffer size. */ 109 static int no_more_sessions = 0; /* Disallow further sessions. */ 110 111 /* 112 * This SIGCHLD kludge is used to detect when the child exits. The server 113 * will exit after that, as soon as forwarded connections have terminated. 114 */ 115 116 static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */ 117 118 /* Cleanup on signals (!use_privsep case only) */ 119 static volatile sig_atomic_t received_sigterm = 0; 120 121 /* prototypes */ 122 static void server_init_dispatch(void); 123 124 /* 125 * Returns current time in seconds from Jan 1, 1970 with the maximum 126 * available resolution. 127 */ 128 129 static double 130 get_current_time(void) 131 { 132 struct timeval tv; 133 gettimeofday(&tv, NULL); 134 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; 135 } 136 137 138 /* 139 * we write to this pipe if a SIGCHLD is caught in order to avoid 140 * the race between select() and child_terminated 141 */ 142 static int notify_pipe[2]; 143 static void 144 notify_setup(void) 145 { 146 if (pipe(notify_pipe) < 0) { 147 error("pipe(notify_pipe) failed %s", strerror(errno)); 148 } else if ((fcntl(notify_pipe[0], F_SETFD, FD_CLOEXEC) == -1) || 149 (fcntl(notify_pipe[1], F_SETFD, FD_CLOEXEC) == -1)) { 150 error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno)); 151 close(notify_pipe[0]); 152 close(notify_pipe[1]); 153 } else { 154 set_nonblock(notify_pipe[0]); 155 set_nonblock(notify_pipe[1]); 156 return; 157 } 158 notify_pipe[0] = -1; /* read end */ 159 notify_pipe[1] = -1; /* write end */ 160 } 161 static void 162 notify_parent(void) 163 { 164 if (notify_pipe[1] != -1) 165 (void)write(notify_pipe[1], "", 1); 166 } 167 static void 168 notify_prepare(fd_set *readset) 169 { 170 if (notify_pipe[0] != -1) 171 FD_SET(notify_pipe[0], readset); 172 } 173 static void 174 notify_done(fd_set *readset) 175 { 176 char c; 177 178 if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset)) 179 while (read(notify_pipe[0], &c, 1) != -1) 180 debug2("notify_done: reading"); 181 } 182 183 /*ARGSUSED*/ 184 static void 185 sigchld_handler(int sig) 186 { 187 int save_errno = errno; 188 child_terminated = 1; 189 #ifndef _UNICOS 190 mysignal(SIGCHLD, sigchld_handler); 191 #endif 192 notify_parent(); 193 errno = save_errno; 194 } 195 196 /*ARGSUSED*/ 197 static void 198 sigterm_handler(int sig) 199 { 200 received_sigterm = sig; 201 } 202 203 /* 204 * Make packets from buffered stderr data, and buffer it for sending 205 * to the client. 206 */ 207 static void 208 make_packets_from_stderr_data(void) 209 { 210 u_int len; 211 212 /* Send buffered stderr data to the client. */ 213 while (buffer_len(&stderr_buffer) > 0 && 214 packet_not_very_much_data_to_write()) { 215 len = buffer_len(&stderr_buffer); 216 if (packet_is_interactive()) { 217 if (len > 512) 218 len = 512; 219 } else { 220 /* Keep the packets at reasonable size. */ 221 if (len > packet_get_maxsize()) 222 len = packet_get_maxsize(); 223 } 224 packet_start(SSH_SMSG_STDERR_DATA); 225 packet_put_string(buffer_ptr(&stderr_buffer), len); 226 packet_send(); 227 buffer_consume(&stderr_buffer, len); 228 stderr_bytes += len; 229 } 230 } 231 232 /* 233 * Make packets from buffered stdout data, and buffer it for sending to the 234 * client. 235 */ 236 static void 237 make_packets_from_stdout_data(void) 238 { 239 u_int len; 240 241 /* Send buffered stdout data to the client. */ 242 while (buffer_len(&stdout_buffer) > 0 && 243 packet_not_very_much_data_to_write()) { 244 len = buffer_len(&stdout_buffer); 245 if (packet_is_interactive()) { 246 if (len > 512) 247 len = 512; 248 } else { 249 /* Keep the packets at reasonable size. */ 250 if (len > packet_get_maxsize()) 251 len = packet_get_maxsize(); 252 } 253 packet_start(SSH_SMSG_STDOUT_DATA); 254 packet_put_string(buffer_ptr(&stdout_buffer), len); 255 packet_send(); 256 buffer_consume(&stdout_buffer, len); 257 stdout_bytes += len; 258 } 259 } 260 261 static void 262 client_alive_check(void) 263 { 264 int channel_id; 265 266 /* timeout, check to see how many we have had */ 267 if (packet_inc_alive_timeouts() > options.client_alive_count_max) { 268 logit("Timeout, client not responding."); 269 cleanup_exit(255); 270 } 271 272 /* 273 * send a bogus global/channel request with "wantreply", 274 * we should get back a failure 275 */ 276 if ((channel_id = channel_find_open()) == -1) { 277 packet_start(SSH2_MSG_GLOBAL_REQUEST); 278 packet_put_cstring("keepalive@openssh.com"); 279 packet_put_char(1); /* boolean: want reply */ 280 } else { 281 channel_request_start(channel_id, "keepalive@openssh.com", 1); 282 } 283 packet_send(); 284 } 285 286 /* 287 * Sleep in select() until we can do something. This will initialize the 288 * select masks. Upon return, the masks will indicate which descriptors 289 * have data or can accept data. Optionally, a maximum time can be specified 290 * for the duration of the wait (0 = infinite). 291 */ 292 static void 293 wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp, 294 u_int *nallocp, u_int64_t max_time_milliseconds) 295 { 296 struct timeval tv, *tvp; 297 int ret; 298 time_t minwait_secs = 0; 299 int client_alive_scheduled = 0; 300 int program_alive_scheduled = 0; 301 302 /* Allocate and update select() masks for channel descriptors. */ 303 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, 304 &minwait_secs, 0); 305 306 if (minwait_secs != 0) 307 max_time_milliseconds = MIN(max_time_milliseconds, 308 (u_int)minwait_secs * 1000); 309 310 /* 311 * if using client_alive, set the max timeout accordingly, 312 * and indicate that this particular timeout was for client 313 * alive by setting the client_alive_scheduled flag. 314 * 315 * this could be randomized somewhat to make traffic 316 * analysis more difficult, but we're not doing it yet. 317 */ 318 if (compat20 && 319 max_time_milliseconds == 0 && options.client_alive_interval) { 320 client_alive_scheduled = 1; 321 max_time_milliseconds = 322 (u_int64_t)options.client_alive_interval * 1000; 323 } 324 325 if (compat20) { 326 #if 0 327 /* wrong: bad condition XXX */ 328 if (channel_not_very_much_buffered_data()) 329 #endif 330 FD_SET(connection_in, *readsetp); 331 } else { 332 /* 333 * Read packets from the client unless we have too much 334 * buffered stdin or channel data. 335 */ 336 if (buffer_len(&stdin_buffer) < buffer_high && 337 channel_not_very_much_buffered_data()) 338 FD_SET(connection_in, *readsetp); 339 /* 340 * If there is not too much data already buffered going to 341 * the client, try to get some more data from the program. 342 */ 343 if (packet_not_very_much_data_to_write()) { 344 program_alive_scheduled = child_terminated; 345 if (!fdout_eof) 346 FD_SET(fdout, *readsetp); 347 if (!fderr_eof) 348 FD_SET(fderr, *readsetp); 349 } 350 /* 351 * If we have buffered data, try to write some of that data 352 * to the program. 353 */ 354 if (fdin != -1 && buffer_len(&stdin_buffer) > 0) 355 FD_SET(fdin, *writesetp); 356 } 357 notify_prepare(*readsetp); 358 359 /* 360 * If we have buffered packet data going to the client, mark that 361 * descriptor. 362 */ 363 if (packet_have_data_to_write()) 364 FD_SET(connection_out, *writesetp); 365 366 /* 367 * If child has terminated and there is enough buffer space to read 368 * from it, then read as much as is available and exit. 369 */ 370 if (child_terminated && packet_not_very_much_data_to_write()) 371 if (max_time_milliseconds == 0 || client_alive_scheduled) 372 max_time_milliseconds = 100; 373 374 if (max_time_milliseconds == 0) 375 tvp = NULL; 376 else { 377 tv.tv_sec = max_time_milliseconds / 1000; 378 tv.tv_usec = 1000 * (max_time_milliseconds % 1000); 379 tvp = &tv; 380 } 381 382 /* Wait for something to happen, or the timeout to expire. */ 383 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); 384 385 if (ret == -1) { 386 memset(*readsetp, 0, *nallocp); 387 memset(*writesetp, 0, *nallocp); 388 if (errno != EINTR) 389 error("select: %.100s", strerror(errno)); 390 } else { 391 if (ret == 0 && client_alive_scheduled) 392 client_alive_check(); 393 if (!compat20 && program_alive_scheduled && fdin_is_tty) { 394 if (!fdout_eof) 395 FD_SET(fdout, *readsetp); 396 if (!fderr_eof) 397 FD_SET(fderr, *readsetp); 398 } 399 } 400 401 notify_done(*readsetp); 402 } 403 404 /* 405 * Processes input from the client and the program. Input data is stored 406 * in buffers and processed later. 407 */ 408 static void 409 process_input(fd_set *readset) 410 { 411 int len; 412 char buf[16384]; 413 414 /* Read and buffer any input data from the client. */ 415 if (FD_ISSET(connection_in, readset)) { 416 int cont = 0; 417 len = roaming_read(connection_in, buf, sizeof(buf), &cont); 418 if (len == 0) { 419 if (cont) 420 return; 421 verbose("Connection closed by %.100s", 422 get_remote_ipaddr()); 423 connection_closed = 1; 424 if (compat20) 425 return; 426 cleanup_exit(255); 427 } else if (len < 0) { 428 if (errno != EINTR && errno != EAGAIN && 429 errno != EWOULDBLOCK) { 430 verbose("Read error from remote host " 431 "%.100s: %.100s", 432 get_remote_ipaddr(), strerror(errno)); 433 cleanup_exit(255); 434 } 435 } else { 436 /* Buffer any received data. */ 437 packet_process_incoming(buf, len); 438 fdout_bytes += len; 439 } 440 } 441 if (compat20) 442 return; 443 444 /* Read and buffer any available stdout data from the program. */ 445 if (!fdout_eof && FD_ISSET(fdout, readset)) { 446 errno = 0; 447 len = read(fdout, buf, sizeof(buf)); 448 if (len < 0 && (errno == EINTR || ((errno == EAGAIN || 449 errno == EWOULDBLOCK) && !child_terminated))) { 450 /* do nothing */ 451 #ifndef PTY_ZEROREAD 452 } else if (len <= 0) { 453 #else 454 } else if ((!isatty(fdout) && len <= 0) || 455 (isatty(fdout) && (len < 0 || (len == 0 && errno != 0)))) { 456 #endif 457 fdout_eof = 1; 458 } else { 459 buffer_append(&stdout_buffer, buf, len); 460 fdout_bytes += len; 461 debug ("FD out now: %ld", fdout_bytes); 462 } 463 } 464 /* Read and buffer any available stderr data from the program. */ 465 if (!fderr_eof && FD_ISSET(fderr, readset)) { 466 errno = 0; 467 len = read(fderr, buf, sizeof(buf)); 468 if (len < 0 && (errno == EINTR || ((errno == EAGAIN || 469 errno == EWOULDBLOCK) && !child_terminated))) { 470 /* do nothing */ 471 #ifndef PTY_ZEROREAD 472 } else if (len <= 0) { 473 #else 474 } else if ((!isatty(fderr) && len <= 0) || 475 (isatty(fderr) && (len < 0 || (len == 0 && errno != 0)))) { 476 #endif 477 fderr_eof = 1; 478 } else { 479 buffer_append(&stderr_buffer, buf, len); 480 } 481 } 482 } 483 484 /* 485 * Sends data from internal buffers to client program stdin. 486 */ 487 static void 488 process_output(fd_set *writeset) 489 { 490 struct termios tio; 491 u_char *data; 492 u_int dlen; 493 int len; 494 495 /* Write buffered data to program stdin. */ 496 if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) { 497 data = buffer_ptr(&stdin_buffer); 498 dlen = buffer_len(&stdin_buffer); 499 len = write(fdin, data, dlen); 500 if (len < 0 && 501 (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) { 502 /* do nothing */ 503 } else if (len <= 0) { 504 if (fdin != fdout) 505 close(fdin); 506 else 507 shutdown(fdin, SHUT_WR); /* We will no longer send. */ 508 fdin = -1; 509 } else { 510 /* Successful write. */ 511 if (fdin_is_tty && dlen >= 1 && data[0] != '\r' && 512 tcgetattr(fdin, &tio) == 0 && 513 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { 514 /* 515 * Simulate echo to reduce the impact of 516 * traffic analysis 517 */ 518 packet_send_ignore(len); 519 packet_send(); 520 } 521 /* Consume the data from the buffer. */ 522 buffer_consume(&stdin_buffer, len); 523 /* Update the count of bytes written to the program. */ 524 stdin_bytes += len; 525 } 526 } 527 /* Send any buffered packet data to the client. */ 528 if (FD_ISSET(connection_out, writeset)) 529 stdin_bytes += packet_write_poll(); 530 } 531 532 /* 533 * Wait until all buffered output has been sent to the client. 534 * This is used when the program terminates. 535 */ 536 static void 537 drain_output(void) 538 { 539 /* Send any buffered stdout data to the client. */ 540 if (buffer_len(&stdout_buffer) > 0) { 541 packet_start(SSH_SMSG_STDOUT_DATA); 542 packet_put_string(buffer_ptr(&stdout_buffer), 543 buffer_len(&stdout_buffer)); 544 packet_send(); 545 /* Update the count of sent bytes. */ 546 stdout_bytes += buffer_len(&stdout_buffer); 547 } 548 /* Send any buffered stderr data to the client. */ 549 if (buffer_len(&stderr_buffer) > 0) { 550 packet_start(SSH_SMSG_STDERR_DATA); 551 packet_put_string(buffer_ptr(&stderr_buffer), 552 buffer_len(&stderr_buffer)); 553 packet_send(); 554 /* Update the count of sent bytes. */ 555 stderr_bytes += buffer_len(&stderr_buffer); 556 } 557 /* Wait until all buffered data has been written to the client. */ 558 packet_write_wait(); 559 } 560 561 static void 562 process_buffered_input_packets(void) 563 { 564 dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? xxx_kex : NULL); 565 } 566 567 /* 568 * Performs the interactive session. This handles data transmission between 569 * the client and the program. Note that the notion of stdin, stdout, and 570 * stderr in this function is sort of reversed: this function writes to 571 * stdin (of the child program), and reads from stdout and stderr (of the 572 * child program). 573 */ 574 void 575 server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg) 576 { 577 fd_set *readset = NULL, *writeset = NULL; 578 int max_fd = 0; 579 u_int nalloc = 0; 580 int wait_status; /* Status returned by wait(). */ 581 pid_t wait_pid; /* pid returned by wait(). */ 582 int waiting_termination = 0; /* Have displayed waiting close message. */ 583 u_int64_t max_time_milliseconds; 584 u_int previous_stdout_buffer_bytes; 585 u_int stdout_buffer_bytes; 586 int type; 587 588 debug("Entering interactive session."); 589 590 /* Initialize the SIGCHLD kludge. */ 591 child_terminated = 0; 592 mysignal(SIGCHLD, sigchld_handler); 593 594 if (!use_privsep) { 595 signal(SIGTERM, sigterm_handler); 596 signal(SIGINT, sigterm_handler); 597 signal(SIGQUIT, sigterm_handler); 598 } 599 600 /* Initialize our global variables. */ 601 fdin = fdin_arg; 602 fdout = fdout_arg; 603 fderr = fderr_arg; 604 605 /* nonblocking IO */ 606 set_nonblock(fdin); 607 set_nonblock(fdout); 608 /* we don't have stderr for interactive terminal sessions, see below */ 609 if (fderr != -1) 610 set_nonblock(fderr); 611 612 if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin)) 613 fdin_is_tty = 1; 614 615 connection_in = packet_get_connection_in(); 616 connection_out = packet_get_connection_out(); 617 618 notify_setup(); 619 620 previous_stdout_buffer_bytes = 0; 621 622 /* Set approximate I/O buffer size. */ 623 if (packet_is_interactive()) 624 buffer_high = 4096; 625 else 626 buffer_high = 64 * 1024; 627 628 #if 0 629 /* Initialize max_fd to the maximum of the known file descriptors. */ 630 max_fd = MAX(connection_in, connection_out); 631 max_fd = MAX(max_fd, fdin); 632 max_fd = MAX(max_fd, fdout); 633 if (fderr != -1) 634 max_fd = MAX(max_fd, fderr); 635 #endif 636 637 /* Initialize Initialize buffers. */ 638 buffer_init(&stdin_buffer); 639 buffer_init(&stdout_buffer); 640 buffer_init(&stderr_buffer); 641 642 /* 643 * If we have no separate fderr (which is the case when we have a pty 644 * - there we cannot make difference between data sent to stdout and 645 * stderr), indicate that we have seen an EOF from stderr. This way 646 * we don't need to check the descriptor everywhere. 647 */ 648 if (fderr == -1) 649 fderr_eof = 1; 650 651 server_init_dispatch(); 652 653 /* Main loop of the server for the interactive session mode. */ 654 for (;;) { 655 656 /* Process buffered packets from the client. */ 657 process_buffered_input_packets(); 658 659 /* 660 * If we have received eof, and there is no more pending 661 * input data, cause a real eof by closing fdin. 662 */ 663 if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) { 664 if (fdin != fdout) 665 close(fdin); 666 else 667 shutdown(fdin, SHUT_WR); /* We will no longer send. */ 668 fdin = -1; 669 } 670 /* Make packets from buffered stderr data to send to the client. */ 671 make_packets_from_stderr_data(); 672 673 /* 674 * Make packets from buffered stdout data to send to the 675 * client. If there is very little to send, this arranges to 676 * not send them now, but to wait a short while to see if we 677 * are getting more data. This is necessary, as some systems 678 * wake up readers from a pty after each separate character. 679 */ 680 max_time_milliseconds = 0; 681 stdout_buffer_bytes = buffer_len(&stdout_buffer); 682 if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 && 683 stdout_buffer_bytes != previous_stdout_buffer_bytes) { 684 /* try again after a while */ 685 max_time_milliseconds = 10; 686 } else { 687 /* Send it now. */ 688 make_packets_from_stdout_data(); 689 } 690 previous_stdout_buffer_bytes = buffer_len(&stdout_buffer); 691 692 /* Send channel data to the client. */ 693 if (packet_not_very_much_data_to_write()) 694 channel_output_poll(); 695 696 /* 697 * Bail out of the loop if the program has closed its output 698 * descriptors, and we have no more data to send to the 699 * client, and there is no pending buffered data. 700 */ 701 if (fdout_eof && fderr_eof && !packet_have_data_to_write() && 702 buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) { 703 if (!channel_still_open()) 704 break; 705 if (!waiting_termination) { 706 const char *s = "Waiting for forwarded connections to terminate...\r\n"; 707 char *cp; 708 waiting_termination = 1; 709 buffer_append(&stderr_buffer, s, strlen(s)); 710 711 /* Display list of open channels. */ 712 cp = channel_open_message(); 713 buffer_append(&stderr_buffer, cp, strlen(cp)); 714 free(cp); 715 } 716 } 717 max_fd = MAX(connection_in, connection_out); 718 max_fd = MAX(max_fd, fdin); 719 max_fd = MAX(max_fd, fdout); 720 max_fd = MAX(max_fd, fderr); 721 max_fd = MAX(max_fd, notify_pipe[0]); 722 723 /* Sleep in select() until we can do something. */ 724 wait_until_can_do_something(&readset, &writeset, &max_fd, 725 &nalloc, max_time_milliseconds); 726 727 if (received_sigterm) { 728 logit("Exiting on signal %d", (int)received_sigterm); 729 /* Clean up sessions, utmp, etc. */ 730 cleanup_exit(255); 731 } 732 733 /* Process any channel events. */ 734 channel_after_select(readset, writeset); 735 736 /* Process input from the client and from program stdout/stderr. */ 737 process_input(readset); 738 739 /* Process output to the client and to program stdin. */ 740 process_output(writeset); 741 } 742 free(readset); 743 free(writeset); 744 745 /* Cleanup and termination code. */ 746 747 /* Wait until all output has been sent to the client. */ 748 drain_output(); 749 750 debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.", 751 stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes); 752 753 /* Free and clear the buffers. */ 754 buffer_free(&stdin_buffer); 755 buffer_free(&stdout_buffer); 756 buffer_free(&stderr_buffer); 757 758 /* Close the file descriptors. */ 759 if (fdout != -1) 760 close(fdout); 761 fdout = -1; 762 fdout_eof = 1; 763 if (fderr != -1) 764 close(fderr); 765 fderr = -1; 766 fderr_eof = 1; 767 if (fdin != -1) 768 close(fdin); 769 fdin = -1; 770 771 channel_free_all(); 772 773 /* We no longer want our SIGCHLD handler to be called. */ 774 mysignal(SIGCHLD, SIG_DFL); 775 776 while ((wait_pid = waitpid(-1, &wait_status, 0)) < 0) 777 if (errno != EINTR) 778 packet_disconnect("wait: %.100s", strerror(errno)); 779 if (wait_pid != pid) 780 error("Strange, wait returned pid %ld, expected %ld", 781 (long)wait_pid, (long)pid); 782 783 /* Check if it exited normally. */ 784 if (WIFEXITED(wait_status)) { 785 /* Yes, normal exit. Get exit status and send it to the client. */ 786 debug("Command exited with status %d.", WEXITSTATUS(wait_status)); 787 packet_start(SSH_SMSG_EXITSTATUS); 788 packet_put_int(WEXITSTATUS(wait_status)); 789 packet_send(); 790 packet_write_wait(); 791 792 /* 793 * Wait for exit confirmation. Note that there might be 794 * other packets coming before it; however, the program has 795 * already died so we just ignore them. The client is 796 * supposed to respond with the confirmation when it receives 797 * the exit status. 798 */ 799 do { 800 type = packet_read(); 801 } 802 while (type != SSH_CMSG_EXIT_CONFIRMATION); 803 804 debug("Received exit confirmation."); 805 return; 806 } 807 /* Check if the program terminated due to a signal. */ 808 if (WIFSIGNALED(wait_status)) 809 packet_disconnect("Command terminated on signal %d.", 810 WTERMSIG(wait_status)); 811 812 /* Some weird exit cause. Just exit. */ 813 packet_disconnect("wait returned status %04x.", wait_status); 814 /* NOTREACHED */ 815 } 816 817 static void 818 collect_children(void) 819 { 820 pid_t pid; 821 sigset_t oset, nset; 822 int status; 823 824 /* block SIGCHLD while we check for dead children */ 825 sigemptyset(&nset); 826 sigaddset(&nset, SIGCHLD); 827 sigprocmask(SIG_BLOCK, &nset, &oset); 828 if (child_terminated) { 829 debug("Received SIGCHLD."); 830 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || 831 (pid < 0 && errno == EINTR)) 832 if (pid > 0) 833 session_close_by_pid(pid, status); 834 child_terminated = 0; 835 } 836 sigprocmask(SIG_SETMASK, &oset, NULL); 837 } 838 839 void 840 server_loop2(Authctxt *authctxt) 841 { 842 fd_set *readset = NULL, *writeset = NULL; 843 double start_time, total_time; 844 int rekeying = 0, max_fd; 845 u_int nalloc = 0; 846 u_int64_t rekey_timeout_ms = 0; 847 848 debug("Entering interactive session for SSH2."); 849 start_time = get_current_time(); 850 851 mysignal(SIGCHLD, sigchld_handler); 852 child_terminated = 0; 853 connection_in = packet_get_connection_in(); 854 connection_out = packet_get_connection_out(); 855 856 if (!use_privsep) { 857 signal(SIGTERM, sigterm_handler); 858 signal(SIGINT, sigterm_handler); 859 signal(SIGQUIT, sigterm_handler); 860 } 861 862 notify_setup(); 863 864 max_fd = MAX(connection_in, connection_out); 865 max_fd = MAX(max_fd, notify_pipe[0]); 866 867 server_init_dispatch(); 868 869 for (;;) { 870 process_buffered_input_packets(); 871 872 rekeying = (xxx_kex != NULL && !xxx_kex->done); 873 874 if (!rekeying && packet_not_very_much_data_to_write()) 875 channel_output_poll(); 876 if (options.rekey_interval > 0 && compat20 && !rekeying) 877 rekey_timeout_ms = packet_get_rekey_timeout() * 1000; 878 else 879 rekey_timeout_ms = 0; 880 881 wait_until_can_do_something(&readset, &writeset, &max_fd, 882 &nalloc, rekey_timeout_ms); 883 884 if (received_sigterm) { 885 logit("Exiting on signal %d", (int)received_sigterm); 886 /* Clean up sessions, utmp, etc. */ 887 cleanup_exit(255); 888 } 889 890 collect_children(); 891 if (!rekeying) { 892 channel_after_select(readset, writeset); 893 if (packet_need_rekeying()) { 894 debug("need rekeying"); 895 xxx_kex->done = 0; 896 kex_send_kexinit(xxx_kex); 897 } 898 } 899 process_input(readset); 900 if (connection_closed) 901 break; 902 process_output(writeset); 903 } 904 collect_children(); 905 906 free(readset); 907 free(writeset); 908 909 /* free all channels, no more reads and writes */ 910 channel_free_all(); 911 912 /* free remaining sessions, e.g. remove wtmp entries */ 913 session_destroy_all(NULL); 914 total_time = get_current_time() - start_time; 915 logit("SSH: Server;LType: Throughput;Remote: %s-%d;IN: %lu;OUT: %lu;Duration: %.1f;tPut_in: %.1f;tPut_out: %.1f", 916 get_remote_ipaddr(), get_remote_port(), 917 stdin_bytes, fdout_bytes, total_time, stdin_bytes / total_time, 918 fdout_bytes / total_time); 919 } 920 921 static void 922 server_input_keep_alive(int type, u_int32_t seq, void *ctxt) 923 { 924 debug("Got %d/%u for keepalive", type, seq); 925 /* 926 * reset timeout, since we got a sane answer from the client. 927 * even if this was generated by something other than 928 * the bogus CHANNEL_REQUEST we send for keepalives. 929 */ 930 packet_set_alive_timeouts(0); 931 } 932 933 static void 934 server_input_stdin_data(int type, u_int32_t seq, void *ctxt) 935 { 936 char *data; 937 u_int data_len; 938 939 /* Stdin data from the client. Append it to the buffer. */ 940 /* Ignore any data if the client has closed stdin. */ 941 if (fdin == -1) 942 return; 943 data = packet_get_string(&data_len); 944 packet_check_eom(); 945 buffer_append(&stdin_buffer, data, data_len); 946 explicit_bzero(data, data_len); 947 free(data); 948 } 949 950 static void 951 server_input_eof(int type, u_int32_t seq, void *ctxt) 952 { 953 /* 954 * Eof from the client. The stdin descriptor to the 955 * program will be closed when all buffered data has 956 * drained. 957 */ 958 debug("EOF received for stdin."); 959 packet_check_eom(); 960 stdin_eof = 1; 961 } 962 963 static void 964 server_input_window_size(int type, u_int32_t seq, void *ctxt) 965 { 966 u_int row = packet_get_int(); 967 u_int col = packet_get_int(); 968 u_int xpixel = packet_get_int(); 969 u_int ypixel = packet_get_int(); 970 971 debug("Window change received."); 972 packet_check_eom(); 973 if (fdin != -1) 974 pty_change_window_size(fdin, row, col, xpixel, ypixel); 975 } 976 977 static Channel * 978 server_request_direct_tcpip(void) 979 { 980 Channel *c = NULL; 981 char *target, *originator; 982 u_short target_port, originator_port; 983 984 target = packet_get_string(NULL); 985 target_port = packet_get_int(); 986 originator = packet_get_string(NULL); 987 originator_port = packet_get_int(); 988 packet_check_eom(); 989 990 debug("server_request_direct_tcpip: originator %s port %d, target %s " 991 "port %d", originator, originator_port, target, target_port); 992 993 /* XXX fine grained permissions */ 994 if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0 && 995 !no_port_forwarding_flag) { 996 c = channel_connect_to_port(target, target_port, 997 "direct-tcpip", "direct-tcpip"); 998 } else { 999 logit("refused local port forward: " 1000 "originator %s port %d, target %s port %d", 1001 originator, originator_port, target, target_port); 1002 } 1003 1004 free(originator); 1005 free(target); 1006 1007 return c; 1008 } 1009 1010 static Channel * 1011 server_request_direct_streamlocal(void) 1012 { 1013 Channel *c = NULL; 1014 char *target, *originator; 1015 u_short originator_port; 1016 1017 target = packet_get_string(NULL); 1018 originator = packet_get_string(NULL); 1019 originator_port = packet_get_int(); 1020 packet_check_eom(); 1021 1022 debug("server_request_direct_streamlocal: originator %s port %d, target %s", 1023 originator, originator_port, target); 1024 1025 /* XXX fine grained permissions */ 1026 if ((options.allow_streamlocal_forwarding & FORWARD_LOCAL) != 0 && 1027 !no_port_forwarding_flag) { 1028 c = channel_connect_to_path(target, 1029 "direct-streamlocal@openssh.com", "direct-streamlocal"); 1030 } else { 1031 logit("refused streamlocal port forward: " 1032 "originator %s port %d, target %s", 1033 originator, originator_port, target); 1034 } 1035 1036 free(originator); 1037 free(target); 1038 1039 return c; 1040 } 1041 1042 static Channel * 1043 server_request_tun(void) 1044 { 1045 Channel *c = NULL; 1046 int mode, tun; 1047 int sock; 1048 1049 mode = packet_get_int(); 1050 switch (mode) { 1051 case SSH_TUNMODE_POINTOPOINT: 1052 case SSH_TUNMODE_ETHERNET: 1053 break; 1054 default: 1055 packet_send_debug("Unsupported tunnel device mode."); 1056 return NULL; 1057 } 1058 if ((options.permit_tun & mode) == 0) { 1059 packet_send_debug("Server has rejected tunnel device " 1060 "forwarding"); 1061 return NULL; 1062 } 1063 1064 tun = packet_get_int(); 1065 if (forced_tun_device != -1) { 1066 if (tun != SSH_TUNID_ANY && forced_tun_device != tun) 1067 goto done; 1068 tun = forced_tun_device; 1069 } 1070 sock = tun_open(tun, mode); 1071 if (sock < 0) 1072 goto done; 1073 if (options.hpn_disabled) 1074 c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1, 1075 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); 1076 else 1077 c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1, 1078 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); 1079 c->datagram = 1; 1080 #if defined(SSH_TUN_FILTER) 1081 if (mode == SSH_TUNMODE_POINTOPOINT) 1082 channel_register_filter(c->self, sys_tun_infilter, 1083 sys_tun_outfilter, NULL, NULL); 1084 #endif 1085 1086 done: 1087 if (c == NULL) 1088 packet_send_debug("Failed to open the tunnel device."); 1089 return c; 1090 } 1091 1092 static Channel * 1093 server_request_session(void) 1094 { 1095 Channel *c; 1096 1097 debug("input_session_request"); 1098 packet_check_eom(); 1099 1100 if (no_more_sessions) { 1101 packet_disconnect("Possible attack: attempt to open a session " 1102 "after additional sessions disabled"); 1103 } 1104 1105 /* 1106 * A server session has no fd to read or write until a 1107 * CHANNEL_REQUEST for a shell is made, so we set the type to 1108 * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all 1109 * CHANNEL_REQUEST messages is registered. 1110 */ 1111 c = channel_new("session", SSH_CHANNEL_LARVAL, 1112 -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT, 1113 0, "server-session", 1); 1114 if ((options.tcp_rcv_buf_poll) && (!options.hpn_disabled)) 1115 c->dynamic_window = 1; 1116 if (session_open(the_authctxt, c->self) != 1) { 1117 debug("session open failed, free channel %d", c->self); 1118 channel_free(c); 1119 return NULL; 1120 } 1121 channel_register_cleanup(c->self, session_close_by_channel, 0); 1122 return c; 1123 } 1124 1125 static void 1126 server_input_channel_open(int type, u_int32_t seq, void *ctxt) 1127 { 1128 Channel *c = NULL; 1129 char *ctype; 1130 int rchan; 1131 u_int rmaxpack, rwindow, len; 1132 1133 ctype = packet_get_string(&len); 1134 rchan = packet_get_int(); 1135 rwindow = packet_get_int(); 1136 rmaxpack = packet_get_int(); 1137 1138 debug("server_input_channel_open: ctype %s rchan %d win %d max %d", 1139 ctype, rchan, rwindow, rmaxpack); 1140 1141 if (strcmp(ctype, "session") == 0) { 1142 c = server_request_session(); 1143 } else if (strcmp(ctype, "direct-tcpip") == 0) { 1144 c = server_request_direct_tcpip(); 1145 } else if (strcmp(ctype, "direct-streamlocal@openssh.com") == 0) { 1146 c = server_request_direct_streamlocal(); 1147 } else if (strcmp(ctype, "tun@openssh.com") == 0) { 1148 c = server_request_tun(); 1149 } 1150 if (c != NULL) { 1151 debug("server_input_channel_open: confirm %s", ctype); 1152 c->remote_id = rchan; 1153 c->remote_window = rwindow; 1154 c->remote_maxpacket = rmaxpack; 1155 if (c->type != SSH_CHANNEL_CONNECTING) { 1156 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); 1157 packet_put_int(c->remote_id); 1158 packet_put_int(c->self); 1159 packet_put_int(c->local_window); 1160 packet_put_int(c->local_maxpacket); 1161 packet_send(); 1162 } 1163 } else { 1164 debug("server_input_channel_open: failure %s", ctype); 1165 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); 1166 packet_put_int(rchan); 1167 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); 1168 if (!(datafellows & SSH_BUG_OPENFAILURE)) { 1169 packet_put_cstring("open failed"); 1170 packet_put_cstring(""); 1171 } 1172 packet_send(); 1173 } 1174 free(ctype); 1175 } 1176 1177 static void 1178 server_input_global_request(int type, u_int32_t seq, void *ctxt) 1179 { 1180 char *rtype; 1181 int want_reply; 1182 int success = 0, allocated_listen_port = 0; 1183 1184 rtype = packet_get_string(NULL); 1185 want_reply = packet_get_char(); 1186 debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply); 1187 1188 /* -R style forwarding */ 1189 if (strcmp(rtype, "tcpip-forward") == 0) { 1190 struct passwd *pw; 1191 struct Forward fwd; 1192 1193 pw = the_authctxt->pw; 1194 if (pw == NULL || !the_authctxt->valid) 1195 fatal("server_input_global_request: no/invalid user"); 1196 memset(&fwd, 0, sizeof(fwd)); 1197 fwd.listen_host = packet_get_string(NULL); 1198 fwd.listen_port = (u_short)packet_get_int(); 1199 debug("server_input_global_request: tcpip-forward listen %s port %d", 1200 fwd.listen_host, fwd.listen_port); 1201 1202 /* check permissions */ 1203 if ((options.allow_tcp_forwarding & FORWARD_REMOTE) == 0 || 1204 no_port_forwarding_flag || 1205 (!want_reply && fwd.listen_port == 0) 1206 #ifndef NO_IPPORT_RESERVED_CONCEPT 1207 || (fwd.listen_port != 0 && fwd.listen_port < IPPORT_RESERVED && 1208 pw->pw_uid != 0) 1209 #endif 1210 ) { 1211 success = 0; 1212 packet_send_debug("Server has disabled port forwarding."); 1213 } else { 1214 /* Start listening on the port */ 1215 success = channel_setup_remote_fwd_listener(&fwd, 1216 &allocated_listen_port, &options.fwd_opts); 1217 } 1218 free(fwd.listen_host); 1219 } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) { 1220 struct Forward fwd; 1221 1222 memset(&fwd, 0, sizeof(fwd)); 1223 fwd.listen_host = packet_get_string(NULL); 1224 fwd.listen_port = (u_short)packet_get_int(); 1225 debug("%s: cancel-tcpip-forward addr %s port %d", __func__, 1226 fwd.listen_host, fwd.listen_port); 1227 1228 success = channel_cancel_rport_listener(&fwd); 1229 free(fwd.listen_host); 1230 } else if (strcmp(rtype, "streamlocal-forward@openssh.com") == 0) { 1231 struct Forward fwd; 1232 1233 memset(&fwd, 0, sizeof(fwd)); 1234 fwd.listen_path = packet_get_string(NULL); 1235 debug("server_input_global_request: streamlocal-forward listen path %s", 1236 fwd.listen_path); 1237 1238 /* check permissions */ 1239 if ((options.allow_streamlocal_forwarding & FORWARD_REMOTE) == 0 1240 || no_port_forwarding_flag) { 1241 success = 0; 1242 packet_send_debug("Server has disabled port forwarding."); 1243 } else { 1244 /* Start listening on the socket */ 1245 success = channel_setup_remote_fwd_listener( 1246 &fwd, NULL, &options.fwd_opts); 1247 } 1248 free(fwd.listen_path); 1249 } else if (strcmp(rtype, "cancel-streamlocal-forward@openssh.com") == 0) { 1250 struct Forward fwd; 1251 1252 memset(&fwd, 0, sizeof(fwd)); 1253 fwd.listen_path = packet_get_string(NULL); 1254 debug("%s: cancel-streamlocal-forward path %s", __func__, 1255 fwd.listen_path); 1256 1257 success = channel_cancel_rport_listener(&fwd); 1258 free(fwd.listen_path); 1259 } else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) { 1260 no_more_sessions = 1; 1261 success = 1; 1262 } 1263 if (want_reply) { 1264 packet_start(success ? 1265 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); 1266 if (success && allocated_listen_port > 0) 1267 packet_put_int(allocated_listen_port); 1268 packet_send(); 1269 packet_write_wait(); 1270 } 1271 free(rtype); 1272 } 1273 1274 static void 1275 server_input_channel_req(int type, u_int32_t seq, void *ctxt) 1276 { 1277 Channel *c; 1278 int id, reply, success = 0; 1279 char *rtype; 1280 1281 id = packet_get_int(); 1282 rtype = packet_get_string(NULL); 1283 reply = packet_get_char(); 1284 1285 debug("server_input_channel_req: channel %d request %s reply %d", 1286 id, rtype, reply); 1287 1288 if ((c = channel_lookup(id)) == NULL) 1289 packet_disconnect("server_input_channel_req: " 1290 "unknown channel %d", id); 1291 if (!strcmp(rtype, "eow@openssh.com")) { 1292 packet_check_eom(); 1293 chan_rcvd_eow(c); 1294 } else if ((c->type == SSH_CHANNEL_LARVAL || 1295 c->type == SSH_CHANNEL_OPEN) && strcmp(c->ctype, "session") == 0) 1296 success = session_input_channel_req(c, rtype); 1297 if (reply && !(c->flags & CHAN_CLOSE_SENT)) { 1298 packet_start(success ? 1299 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); 1300 packet_put_int(c->remote_id); 1301 packet_send(); 1302 } 1303 free(rtype); 1304 } 1305 1306 static void 1307 server_init_dispatch_20(void) 1308 { 1309 debug("server_init_dispatch_20"); 1310 dispatch_init(&dispatch_protocol_error); 1311 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); 1312 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); 1313 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); 1314 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); 1315 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open); 1316 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 1317 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 1318 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req); 1319 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); 1320 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request); 1321 /* client_alive */ 1322 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &server_input_keep_alive); 1323 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive); 1324 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive); 1325 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive); 1326 /* rekeying */ 1327 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); 1328 } 1329 static void 1330 server_init_dispatch_13(void) 1331 { 1332 debug("server_init_dispatch_13"); 1333 dispatch_init(NULL); 1334 dispatch_set(SSH_CMSG_EOF, &server_input_eof); 1335 dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data); 1336 dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size); 1337 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); 1338 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); 1339 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); 1340 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 1341 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 1342 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); 1343 } 1344 static void 1345 server_init_dispatch_15(void) 1346 { 1347 server_init_dispatch_13(); 1348 debug("server_init_dispatch_15"); 1349 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); 1350 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose); 1351 } 1352 static void 1353 server_init_dispatch(void) 1354 { 1355 if (compat20) 1356 server_init_dispatch_20(); 1357 else if (compat13) 1358 server_init_dispatch_13(); 1359 else 1360 server_init_dispatch_15(); 1361 } 1362