clientloop.c revision 124208
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" 62RCSID("$OpenBSD: clientloop.c,v 1.112 2003/06/28 16:23:06 deraadt 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 "sshtty.h" 83#include "misc.h" 84#include "readpass.h" 85 86/* import options */ 87extern Options options; 88 89/* Flag indicating that stdin should be redirected from /dev/null. */ 90extern int stdin_null_flag; 91 92/* 93 * Name of the host we are connecting to. This is the name given on the 94 * command line, or the HostName specified for the user-supplied name in a 95 * configuration file. 96 */ 97extern char *host; 98 99/* 100 * Flag to indicate that we have received a window change signal which has 101 * not yet been processed. This will cause a message indicating the new 102 * window size to be sent to the server a little later. This is volatile 103 * because this is updated in a signal handler. 104 */ 105static volatile sig_atomic_t received_window_change_signal = 0; 106static volatile sig_atomic_t received_signal = 0; 107 108/* Flag indicating whether the user\'s terminal is in non-blocking mode. */ 109static int in_non_blocking_mode = 0; 110 111/* Common data for the client loop code. */ 112static int quit_pending; /* Set to non-zero to quit the client loop. */ 113static int escape_char; /* Escape character. */ 114static int escape_pending; /* Last character was the escape character */ 115static int last_was_cr; /* Last character was a newline. */ 116static int exit_status; /* Used to store the exit status of the command. */ 117static int stdin_eof; /* EOF has been encountered on standard error. */ 118static Buffer stdin_buffer; /* Buffer for stdin data. */ 119static Buffer stdout_buffer; /* Buffer for stdout data. */ 120static Buffer stderr_buffer; /* Buffer for stderr data. */ 121static u_long stdin_bytes, stdout_bytes, stderr_bytes; 122static u_int buffer_high;/* Soft max buffer size. */ 123static int connection_in; /* Connection to server (input). */ 124static int connection_out; /* Connection to server (output). */ 125static int need_rekeying; /* Set to non-zero if rekeying is requested. */ 126static int session_closed = 0; /* In SSH2: login session closed. */ 127 128static void client_init_dispatch(void); 129int session_ident = -1; 130 131/*XXX*/ 132extern Kex *xxx_kex; 133 134/* Restores stdin to blocking mode. */ 135 136static void 137leave_non_blocking(void) 138{ 139 if (in_non_blocking_mode) { 140 (void) fcntl(fileno(stdin), F_SETFL, 0); 141 in_non_blocking_mode = 0; 142 fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL); 143 } 144} 145 146/* Puts stdin terminal in non-blocking mode. */ 147 148static void 149enter_non_blocking(void) 150{ 151 in_non_blocking_mode = 1; 152 (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK); 153 fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL); 154} 155 156/* 157 * Signal handler for the window change signal (SIGWINCH). This just sets a 158 * flag indicating that the window has changed. 159 */ 160 161static void 162window_change_handler(int sig) 163{ 164 received_window_change_signal = 1; 165 signal(SIGWINCH, window_change_handler); 166} 167 168/* 169 * Signal handler for signals that cause the program to terminate. These 170 * signals must be trapped to restore terminal modes. 171 */ 172 173static void 174signal_handler(int sig) 175{ 176 received_signal = sig; 177 quit_pending = 1; 178} 179 180/* 181 * Returns current time in seconds from Jan 1, 1970 with the maximum 182 * available resolution. 183 */ 184 185static double 186get_current_time(void) 187{ 188 struct timeval tv; 189 gettimeofday(&tv, NULL); 190 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; 191} 192 193/* 194 * This is called when the interactive is entered. This checks if there is 195 * an EOF coming on stdin. We must check this explicitly, as select() does 196 * not appear to wake up when redirecting from /dev/null. 197 */ 198 199static void 200client_check_initial_eof_on_stdin(void) 201{ 202 int len; 203 char buf[1]; 204 205 /* 206 * If standard input is to be "redirected from /dev/null", we simply 207 * mark that we have seen an EOF and send an EOF message to the 208 * server. Otherwise, we try to read a single character; it appears 209 * that for some files, such /dev/null, select() never wakes up for 210 * read for this descriptor, which means that we never get EOF. This 211 * way we will get the EOF if stdin comes from /dev/null or similar. 212 */ 213 if (stdin_null_flag) { 214 /* Fake EOF on stdin. */ 215 debug("Sending eof."); 216 stdin_eof = 1; 217 packet_start(SSH_CMSG_EOF); 218 packet_send(); 219 } else { 220 enter_non_blocking(); 221 222 /* Check for immediate EOF on stdin. */ 223 len = read(fileno(stdin), buf, 1); 224 if (len == 0) { 225 /* EOF. Record that we have seen it and send EOF to server. */ 226 debug("Sending eof."); 227 stdin_eof = 1; 228 packet_start(SSH_CMSG_EOF); 229 packet_send(); 230 } else if (len > 0) { 231 /* 232 * Got data. We must store the data in the buffer, 233 * and also process it as an escape character if 234 * appropriate. 235 */ 236 if ((u_char) buf[0] == escape_char) 237 escape_pending = 1; 238 else 239 buffer_append(&stdin_buffer, buf, 1); 240 } 241 leave_non_blocking(); 242 } 243} 244 245 246/* 247 * Make packets from buffered stdin data, and buffer them for sending to the 248 * connection. 249 */ 250 251static void 252client_make_packets_from_stdin_data(void) 253{ 254 u_int len; 255 256 /* Send buffered stdin data to the server. */ 257 while (buffer_len(&stdin_buffer) > 0 && 258 packet_not_very_much_data_to_write()) { 259 len = buffer_len(&stdin_buffer); 260 /* Keep the packets at reasonable size. */ 261 if (len > packet_get_maxsize()) 262 len = packet_get_maxsize(); 263 packet_start(SSH_CMSG_STDIN_DATA); 264 packet_put_string(buffer_ptr(&stdin_buffer), len); 265 packet_send(); 266 buffer_consume(&stdin_buffer, len); 267 stdin_bytes += len; 268 /* If we have a pending EOF, send it now. */ 269 if (stdin_eof && buffer_len(&stdin_buffer) == 0) { 270 packet_start(SSH_CMSG_EOF); 271 packet_send(); 272 } 273 } 274} 275 276/* 277 * Checks if the client window has changed, and sends a packet about it to 278 * the server if so. The actual change is detected elsewhere (by a software 279 * interrupt on Unix); this just checks the flag and sends a message if 280 * appropriate. 281 */ 282 283static void 284client_check_window_change(void) 285{ 286 struct winsize ws; 287 288 if (! received_window_change_signal) 289 return; 290 /** XXX race */ 291 received_window_change_signal = 0; 292 293 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) 294 return; 295 296 debug2("client_check_window_change: changed"); 297 298 if (compat20) { 299 channel_request_start(session_ident, "window-change", 0); 300 packet_put_int(ws.ws_col); 301 packet_put_int(ws.ws_row); 302 packet_put_int(ws.ws_xpixel); 303 packet_put_int(ws.ws_ypixel); 304 packet_send(); 305 } else { 306 packet_start(SSH_CMSG_WINDOW_SIZE); 307 packet_put_int(ws.ws_row); 308 packet_put_int(ws.ws_col); 309 packet_put_int(ws.ws_xpixel); 310 packet_put_int(ws.ws_ypixel); 311 packet_send(); 312 } 313} 314 315/* 316 * Waits until the client can do something (some data becomes available on 317 * one of the file descriptors). 318 */ 319 320static void 321client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, 322 int *maxfdp, int *nallocp, int rekeying) 323{ 324 /* Add any selections by the channel mechanism. */ 325 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); 326 327 if (!compat20) { 328 /* Read from the connection, unless our buffers are full. */ 329 if (buffer_len(&stdout_buffer) < buffer_high && 330 buffer_len(&stderr_buffer) < buffer_high && 331 channel_not_very_much_buffered_data()) 332 FD_SET(connection_in, *readsetp); 333 /* 334 * Read from stdin, unless we have seen EOF or have very much 335 * buffered data to send to the server. 336 */ 337 if (!stdin_eof && packet_not_very_much_data_to_write()) 338 FD_SET(fileno(stdin), *readsetp); 339 340 /* Select stdout/stderr if have data in buffer. */ 341 if (buffer_len(&stdout_buffer) > 0) 342 FD_SET(fileno(stdout), *writesetp); 343 if (buffer_len(&stderr_buffer) > 0) 344 FD_SET(fileno(stderr), *writesetp); 345 } else { 346 /* channel_prepare_select could have closed the last channel */ 347 if (session_closed && !channel_still_open() && 348 !packet_have_data_to_write()) { 349 /* clear mask since we did not call select() */ 350 memset(*readsetp, 0, *nallocp); 351 memset(*writesetp, 0, *nallocp); 352 return; 353 } else { 354 FD_SET(connection_in, *readsetp); 355 } 356 } 357 358 /* Select server connection if have data to write to the server. */ 359 if (packet_have_data_to_write()) 360 FD_SET(connection_out, *writesetp); 361 362 /* 363 * Wait for something to happen. This will suspend the process until 364 * some selected descriptor can be read, written, or has some other 365 * event pending. Note: if you want to implement SSH_MSG_IGNORE 366 * messages to fool traffic analysis, this might be the place to do 367 * it: just have a random timeout for the select, and send a random 368 * SSH_MSG_IGNORE packet when the timeout expires. 369 */ 370 371 if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) { 372 char buf[100]; 373 374 /* 375 * We have to clear the select masks, because we return. 376 * We have to return, because the mainloop checks for the flags 377 * set by the signal handlers. 378 */ 379 memset(*readsetp, 0, *nallocp); 380 memset(*writesetp, 0, *nallocp); 381 382 if (errno == EINTR) 383 return; 384 /* Note: we might still have data in the buffers. */ 385 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); 386 buffer_append(&stderr_buffer, buf, strlen(buf)); 387 quit_pending = 1; 388 } 389} 390 391static void 392client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) 393{ 394 struct winsize oldws, newws; 395 396 /* Flush stdout and stderr buffers. */ 397 if (buffer_len(bout) > 0) 398 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); 399 if (buffer_len(berr) > 0) 400 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); 401 402 leave_raw_mode(); 403 404 /* 405 * Free (and clear) the buffer to reduce the amount of data that gets 406 * written to swap. 407 */ 408 buffer_free(bin); 409 buffer_free(bout); 410 buffer_free(berr); 411 412 /* Save old window size. */ 413 ioctl(fileno(stdin), TIOCGWINSZ, &oldws); 414 415 /* Send the suspend signal to the program itself. */ 416 kill(getpid(), SIGTSTP); 417 418 /* Check if the window size has changed. */ 419 if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 && 420 (oldws.ws_row != newws.ws_row || 421 oldws.ws_col != newws.ws_col || 422 oldws.ws_xpixel != newws.ws_xpixel || 423 oldws.ws_ypixel != newws.ws_ypixel)) 424 received_window_change_signal = 1; 425 426 /* OK, we have been continued by the user. Reinitialize buffers. */ 427 buffer_init(bin); 428 buffer_init(bout); 429 buffer_init(berr); 430 431 enter_raw_mode(); 432} 433 434static void 435client_process_net_input(fd_set * readset) 436{ 437 int len; 438 char buf[8192]; 439 440 /* 441 * Read input from the server, and add any such data to the buffer of 442 * the packet subsystem. 443 */ 444 if (FD_ISSET(connection_in, readset)) { 445 /* Read as much as possible. */ 446 len = read(connection_in, buf, sizeof(buf)); 447 if (len == 0) { 448 /* Received EOF. The remote host has closed the connection. */ 449 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", 450 host); 451 buffer_append(&stderr_buffer, buf, strlen(buf)); 452 quit_pending = 1; 453 return; 454 } 455 /* 456 * There is a kernel bug on Solaris that causes select to 457 * sometimes wake up even though there is no data available. 458 */ 459 if (len < 0 && (errno == EAGAIN || errno == EINTR)) 460 len = 0; 461 462 if (len < 0) { 463 /* An error has encountered. Perhaps there is a network problem. */ 464 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", 465 host, strerror(errno)); 466 buffer_append(&stderr_buffer, buf, strlen(buf)); 467 quit_pending = 1; 468 return; 469 } 470 packet_process_incoming(buf, len); 471 } 472} 473 474static void 475process_cmdline(void) 476{ 477 void (*handler)(int); 478 char *s, *cmd; 479 u_short fwd_port, fwd_host_port; 480 char buf[1024], sfwd_port[6], sfwd_host_port[6]; 481 int local = 0; 482 483 leave_raw_mode(); 484 handler = signal(SIGINT, SIG_IGN); 485 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); 486 if (s == NULL) 487 goto out; 488 while (*s && isspace(*s)) 489 s++; 490 if (*s == 0) 491 goto out; 492 if (strlen(s) < 2 || s[0] != '-' || !(s[1] == 'L' || s[1] == 'R')) { 493 logit("Invalid command."); 494 goto out; 495 } 496 if (s[1] == 'L') 497 local = 1; 498 if (!local && !compat20) { 499 logit("Not supported for SSH protocol version 1."); 500 goto out; 501 } 502 s += 2; 503 while (*s && isspace(*s)) 504 s++; 505 506 if (sscanf(s, "%5[0-9]:%255[^:]:%5[0-9]", 507 sfwd_port, buf, sfwd_host_port) != 3 && 508 sscanf(s, "%5[0-9]/%255[^/]/%5[0-9]", 509 sfwd_port, buf, sfwd_host_port) != 3) { 510 logit("Bad forwarding specification."); 511 goto out; 512 } 513 if ((fwd_port = a2port(sfwd_port)) == 0 || 514 (fwd_host_port = a2port(sfwd_host_port)) == 0) { 515 logit("Bad forwarding port(s)."); 516 goto out; 517 } 518 if (local) { 519 if (channel_setup_local_fwd_listener(fwd_port, buf, 520 fwd_host_port, options.gateway_ports) < 0) { 521 logit("Port forwarding failed."); 522 goto out; 523 } 524 } else 525 channel_request_remote_forwarding(fwd_port, buf, 526 fwd_host_port); 527 logit("Forwarding port."); 528out: 529 signal(SIGINT, handler); 530 enter_raw_mode(); 531 if (cmd) 532 xfree(cmd); 533} 534 535/* process the characters one by one */ 536static int 537process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) 538{ 539 char string[1024]; 540 pid_t pid; 541 int bytes = 0; 542 u_int i; 543 u_char ch; 544 char *s; 545 546 for (i = 0; i < len; i++) { 547 /* Get one character at a time. */ 548 ch = buf[i]; 549 550 if (escape_pending) { 551 /* We have previously seen an escape character. */ 552 /* Clear the flag now. */ 553 escape_pending = 0; 554 555 /* Process the escaped character. */ 556 switch (ch) { 557 case '.': 558 /* Terminate the connection. */ 559 snprintf(string, sizeof string, "%c.\r\n", escape_char); 560 buffer_append(berr, string, strlen(string)); 561 562 quit_pending = 1; 563 return -1; 564 565 case 'Z' - 64: 566 /* Suspend the program. */ 567 /* Print a message to that effect to the user. */ 568 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); 569 buffer_append(berr, string, strlen(string)); 570 571 /* Restore terminal modes and suspend. */ 572 client_suspend_self(bin, bout, berr); 573 574 /* We have been continued. */ 575 continue; 576 577 case 'B': 578 if (compat20) { 579 snprintf(string, sizeof string, 580 "%cB\r\n", escape_char); 581 buffer_append(berr, string, 582 strlen(string)); 583 channel_request_start(session_ident, 584 "break", 0); 585 packet_put_int(1000); 586 packet_send(); 587 } 588 continue; 589 590 case 'R': 591 if (compat20) { 592 if (datafellows & SSH_BUG_NOREKEY) 593 logit("Server does not support re-keying"); 594 else 595 need_rekeying = 1; 596 } 597 continue; 598 599 case '&': 600 /* 601 * Detach the program (continue to serve connections, 602 * but put in background and no more new connections). 603 */ 604 /* Restore tty modes. */ 605 leave_raw_mode(); 606 607 /* Stop listening for new connections. */ 608 channel_stop_listening(); 609 610 snprintf(string, sizeof string, 611 "%c& [backgrounded]\n", escape_char); 612 buffer_append(berr, string, strlen(string)); 613 614 /* Fork into background. */ 615 pid = fork(); 616 if (pid < 0) { 617 error("fork: %.100s", strerror(errno)); 618 continue; 619 } 620 if (pid != 0) { /* This is the parent. */ 621 /* The parent just exits. */ 622 exit(0); 623 } 624 /* The child continues serving connections. */ 625 if (compat20) { 626 buffer_append(bin, "\004", 1); 627 /* fake EOF on stdin */ 628 return -1; 629 } else if (!stdin_eof) { 630 /* 631 * Sending SSH_CMSG_EOF alone does not always appear 632 * to be enough. So we try to send an EOF character 633 * first. 634 */ 635 packet_start(SSH_CMSG_STDIN_DATA); 636 packet_put_string("\004", 1); 637 packet_send(); 638 /* Close stdin. */ 639 stdin_eof = 1; 640 if (buffer_len(bin) == 0) { 641 packet_start(SSH_CMSG_EOF); 642 packet_send(); 643 } 644 } 645 continue; 646 647 case '?': 648 snprintf(string, sizeof string, 649"%c?\r\n\ 650Supported escape sequences:\r\n\ 651%c. - terminate connection\r\n\ 652%cB - send a BREAK to the remote system\r\n\ 653%cC - open a command line\r\n\ 654%cR - Request rekey (SSH protocol 2 only)\r\n\ 655%c^Z - suspend ssh\r\n\ 656%c# - list forwarded connections\r\n\ 657%c& - background ssh (when waiting for connections to terminate)\r\n\ 658%c? - this message\r\n\ 659%c%c - send the escape character by typing it twice\r\n\ 660(Note that escapes are only recognized immediately after newline.)\r\n", 661 escape_char, escape_char, escape_char, escape_char, 662 escape_char, escape_char, escape_char, escape_char, 663 escape_char, escape_char, escape_char); 664 buffer_append(berr, string, strlen(string)); 665 continue; 666 667 case '#': 668 snprintf(string, sizeof string, "%c#\r\n", escape_char); 669 buffer_append(berr, string, strlen(string)); 670 s = channel_open_message(); 671 buffer_append(berr, s, strlen(s)); 672 xfree(s); 673 continue; 674 675 case 'C': 676 process_cmdline(); 677 continue; 678 679 default: 680 if (ch != escape_char) { 681 buffer_put_char(bin, escape_char); 682 bytes++; 683 } 684 /* Escaped characters fall through here */ 685 break; 686 } 687 } else { 688 /* 689 * The previous character was not an escape char. Check if this 690 * is an escape. 691 */ 692 if (last_was_cr && ch == escape_char) { 693 /* It is. Set the flag and continue to next character. */ 694 escape_pending = 1; 695 continue; 696 } 697 } 698 699 /* 700 * Normal character. Record whether it was a newline, 701 * and append it to the buffer. 702 */ 703 last_was_cr = (ch == '\r' || ch == '\n'); 704 buffer_put_char(bin, ch); 705 bytes++; 706 } 707 return bytes; 708} 709 710static void 711client_process_input(fd_set * readset) 712{ 713 int len; 714 char buf[8192]; 715 716 /* Read input from stdin. */ 717 if (FD_ISSET(fileno(stdin), readset)) { 718 /* Read as much as possible. */ 719 len = read(fileno(stdin), buf, sizeof(buf)); 720 if (len < 0 && (errno == EAGAIN || errno == EINTR)) 721 return; /* we'll try again later */ 722 if (len <= 0) { 723 /* 724 * Received EOF or error. They are treated 725 * similarly, except that an error message is printed 726 * if it was an error condition. 727 */ 728 if (len < 0) { 729 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); 730 buffer_append(&stderr_buffer, buf, strlen(buf)); 731 } 732 /* Mark that we have seen EOF. */ 733 stdin_eof = 1; 734 /* 735 * Send an EOF message to the server unless there is 736 * data in the buffer. If there is data in the 737 * buffer, no message will be sent now. Code 738 * elsewhere will send the EOF when the buffer 739 * becomes empty if stdin_eof is set. 740 */ 741 if (buffer_len(&stdin_buffer) == 0) { 742 packet_start(SSH_CMSG_EOF); 743 packet_send(); 744 } 745 } else if (escape_char == SSH_ESCAPECHAR_NONE) { 746 /* 747 * Normal successful read, and no escape character. 748 * Just append the data to buffer. 749 */ 750 buffer_append(&stdin_buffer, buf, len); 751 } else { 752 /* 753 * Normal, successful read. But we have an escape character 754 * and have to process the characters one by one. 755 */ 756 if (process_escapes(&stdin_buffer, &stdout_buffer, 757 &stderr_buffer, buf, len) == -1) 758 return; 759 } 760 } 761} 762 763static void 764client_process_output(fd_set * writeset) 765{ 766 int len; 767 char buf[100]; 768 769 /* Write buffered output to stdout. */ 770 if (FD_ISSET(fileno(stdout), writeset)) { 771 /* Write as much data as possible. */ 772 len = write(fileno(stdout), buffer_ptr(&stdout_buffer), 773 buffer_len(&stdout_buffer)); 774 if (len <= 0) { 775 if (errno == EINTR || errno == EAGAIN) 776 len = 0; 777 else { 778 /* 779 * An error or EOF was encountered. Put an 780 * error message to stderr buffer. 781 */ 782 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); 783 buffer_append(&stderr_buffer, buf, strlen(buf)); 784 quit_pending = 1; 785 return; 786 } 787 } 788 /* Consume printed data from the buffer. */ 789 buffer_consume(&stdout_buffer, len); 790 stdout_bytes += len; 791 } 792 /* Write buffered output to stderr. */ 793 if (FD_ISSET(fileno(stderr), writeset)) { 794 /* Write as much data as possible. */ 795 len = write(fileno(stderr), buffer_ptr(&stderr_buffer), 796 buffer_len(&stderr_buffer)); 797 if (len <= 0) { 798 if (errno == EINTR || errno == EAGAIN) 799 len = 0; 800 else { 801 /* EOF or error, but can't even print error message. */ 802 quit_pending = 1; 803 return; 804 } 805 } 806 /* Consume printed characters from the buffer. */ 807 buffer_consume(&stderr_buffer, len); 808 stderr_bytes += len; 809 } 810} 811 812/* 813 * Get packets from the connection input buffer, and process them as long as 814 * there are packets available. 815 * 816 * Any unknown packets received during the actual 817 * session cause the session to terminate. This is 818 * intended to make debugging easier since no 819 * confirmations are sent. Any compatible protocol 820 * extensions must be negotiated during the 821 * preparatory phase. 822 */ 823 824static void 825client_process_buffered_input_packets(void) 826{ 827 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); 828} 829 830/* scan buf[] for '~' before sending data to the peer */ 831 832static int 833simple_escape_filter(Channel *c, char *buf, int len) 834{ 835 /* XXX we assume c->extended is writeable */ 836 return process_escapes(&c->input, &c->output, &c->extended, buf, len); 837} 838 839static void 840client_channel_closed(int id, void *arg) 841{ 842 if (id != session_ident) 843 error("client_channel_closed: id %d != session_ident %d", 844 id, session_ident); 845 channel_cancel_cleanup(id); 846 session_closed = 1; 847 if (in_raw_mode()) 848 leave_raw_mode(); 849} 850 851/* 852 * Implements the interactive session with the server. This is called after 853 * the user has been authenticated, and a command has been started on the 854 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character 855 * used as an escape character for terminating or suspending the session. 856 */ 857 858int 859client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) 860{ 861 fd_set *readset = NULL, *writeset = NULL; 862 double start_time, total_time; 863 int max_fd = 0, max_fd2 = 0, len, rekeying = 0, nalloc = 0; 864 char buf[100]; 865 866 debug("Entering interactive session."); 867 868 start_time = get_current_time(); 869 870 /* Initialize variables. */ 871 escape_pending = 0; 872 last_was_cr = 1; 873 exit_status = -1; 874 stdin_eof = 0; 875 buffer_high = 64 * 1024; 876 connection_in = packet_get_connection_in(); 877 connection_out = packet_get_connection_out(); 878 max_fd = MAX(connection_in, connection_out); 879 880 if (!compat20) { 881 /* enable nonblocking unless tty */ 882 if (!isatty(fileno(stdin))) 883 set_nonblock(fileno(stdin)); 884 if (!isatty(fileno(stdout))) 885 set_nonblock(fileno(stdout)); 886 if (!isatty(fileno(stderr))) 887 set_nonblock(fileno(stderr)); 888 max_fd = MAX(max_fd, fileno(stdin)); 889 max_fd = MAX(max_fd, fileno(stdout)); 890 max_fd = MAX(max_fd, fileno(stderr)); 891 } 892 stdin_bytes = 0; 893 stdout_bytes = 0; 894 stderr_bytes = 0; 895 quit_pending = 0; 896 escape_char = escape_char_arg; 897 898 /* Initialize buffers. */ 899 buffer_init(&stdin_buffer); 900 buffer_init(&stdout_buffer); 901 buffer_init(&stderr_buffer); 902 903 client_init_dispatch(); 904 905 /* 906 * Set signal handlers, (e.g. to restore non-blocking mode) 907 * but don't overwrite SIG_IGN, matches behaviour from rsh(1) 908 */ 909 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 910 signal(SIGINT, signal_handler); 911 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) 912 signal(SIGQUIT, signal_handler); 913 if (signal(SIGTERM, SIG_IGN) != SIG_IGN) 914 signal(SIGTERM, signal_handler); 915 if (have_pty) 916 signal(SIGWINCH, window_change_handler); 917 918 if (have_pty) 919 enter_raw_mode(); 920 921 if (compat20) { 922 session_ident = ssh2_chan_id; 923 if (escape_char != SSH_ESCAPECHAR_NONE) 924 channel_register_filter(session_ident, 925 simple_escape_filter); 926 if (session_ident != -1) 927 channel_register_cleanup(session_ident, 928 client_channel_closed); 929 } else { 930 /* Check if we should immediately send eof on stdin. */ 931 client_check_initial_eof_on_stdin(); 932 } 933 934 /* Main loop of the client for the interactive session mode. */ 935 while (!quit_pending) { 936 937 /* Process buffered packets sent by the server. */ 938 client_process_buffered_input_packets(); 939 940 if (compat20 && session_closed && !channel_still_open()) 941 break; 942 943 rekeying = (xxx_kex != NULL && !xxx_kex->done); 944 945 if (rekeying) { 946 debug("rekeying in progress"); 947 } else { 948 /* 949 * Make packets of buffered stdin data, and buffer 950 * them for sending to the server. 951 */ 952 if (!compat20) 953 client_make_packets_from_stdin_data(); 954 955 /* 956 * Make packets from buffered channel data, and 957 * enqueue them for sending to the server. 958 */ 959 if (packet_not_very_much_data_to_write()) 960 channel_output_poll(); 961 962 /* 963 * Check if the window size has changed, and buffer a 964 * message about it to the server if so. 965 */ 966 client_check_window_change(); 967 968 if (quit_pending) 969 break; 970 } 971 /* 972 * Wait until we have something to do (something becomes 973 * available on one of the descriptors). 974 */ 975 max_fd2 = max_fd; 976 client_wait_until_can_do_something(&readset, &writeset, 977 &max_fd2, &nalloc, rekeying); 978 979 if (quit_pending) 980 break; 981 982 /* Do channel operations unless rekeying in progress. */ 983 if (!rekeying) { 984 channel_after_select(readset, writeset); 985 if (need_rekeying || packet_need_rekeying()) { 986 debug("need rekeying"); 987 xxx_kex->done = 0; 988 kex_send_kexinit(xxx_kex); 989 need_rekeying = 0; 990 } 991 } 992 993 /* Buffer input from the connection. */ 994 client_process_net_input(readset); 995 996 if (quit_pending) 997 break; 998 999 if (!compat20) { 1000 /* Buffer data from stdin */ 1001 client_process_input(readset); 1002 /* 1003 * Process output to stdout and stderr. Output to 1004 * the connection is processed elsewhere (above). 1005 */ 1006 client_process_output(writeset); 1007 } 1008 1009 /* Send as much buffered packet data as possible to the sender. */ 1010 if (FD_ISSET(connection_out, writeset)) 1011 packet_write_poll(); 1012 } 1013 if (readset) 1014 xfree(readset); 1015 if (writeset) 1016 xfree(writeset); 1017 1018 /* Terminate the session. */ 1019 1020 /* Stop watching for window change. */ 1021 if (have_pty) 1022 signal(SIGWINCH, SIG_DFL); 1023 1024 channel_free_all(); 1025 1026 if (have_pty) 1027 leave_raw_mode(); 1028 1029 /* restore blocking io */ 1030 if (!isatty(fileno(stdin))) 1031 unset_nonblock(fileno(stdin)); 1032 if (!isatty(fileno(stdout))) 1033 unset_nonblock(fileno(stdout)); 1034 if (!isatty(fileno(stderr))) 1035 unset_nonblock(fileno(stderr)); 1036 1037 if (received_signal) { 1038 if (in_non_blocking_mode) /* XXX */ 1039 leave_non_blocking(); 1040 fatal("Killed by signal %d.", (int) received_signal); 1041 } 1042 1043 /* 1044 * In interactive mode (with pseudo tty) display a message indicating 1045 * that the connection has been closed. 1046 */ 1047 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { 1048 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); 1049 buffer_append(&stderr_buffer, buf, strlen(buf)); 1050 } 1051 1052 /* Output any buffered data for stdout. */ 1053 while (buffer_len(&stdout_buffer) > 0) { 1054 len = write(fileno(stdout), buffer_ptr(&stdout_buffer), 1055 buffer_len(&stdout_buffer)); 1056 if (len <= 0) { 1057 error("Write failed flushing stdout buffer."); 1058 break; 1059 } 1060 buffer_consume(&stdout_buffer, len); 1061 stdout_bytes += len; 1062 } 1063 1064 /* Output any buffered data for stderr. */ 1065 while (buffer_len(&stderr_buffer) > 0) { 1066 len = write(fileno(stderr), buffer_ptr(&stderr_buffer), 1067 buffer_len(&stderr_buffer)); 1068 if (len <= 0) { 1069 error("Write failed flushing stderr buffer."); 1070 break; 1071 } 1072 buffer_consume(&stderr_buffer, len); 1073 stderr_bytes += len; 1074 } 1075 1076 /* Clear and free any buffers. */ 1077 memset(buf, 0, sizeof(buf)); 1078 buffer_free(&stdin_buffer); 1079 buffer_free(&stdout_buffer); 1080 buffer_free(&stderr_buffer); 1081 1082 /* Report bytes transferred, and transfer rates. */ 1083 total_time = get_current_time() - start_time; 1084 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", 1085 stdin_bytes, stdout_bytes, stderr_bytes, total_time); 1086 if (total_time > 0) 1087 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", 1088 stdin_bytes / total_time, stdout_bytes / total_time, 1089 stderr_bytes / total_time); 1090 1091 /* Return the exit status of the program. */ 1092 debug("Exit status %d", exit_status); 1093 return exit_status; 1094} 1095 1096/*********/ 1097 1098static void 1099client_input_stdout_data(int type, u_int32_t seq, void *ctxt) 1100{ 1101 u_int data_len; 1102 char *data = packet_get_string(&data_len); 1103 packet_check_eom(); 1104 buffer_append(&stdout_buffer, data, data_len); 1105 memset(data, 0, data_len); 1106 xfree(data); 1107} 1108static void 1109client_input_stderr_data(int type, u_int32_t seq, void *ctxt) 1110{ 1111 u_int data_len; 1112 char *data = packet_get_string(&data_len); 1113 packet_check_eom(); 1114 buffer_append(&stderr_buffer, data, data_len); 1115 memset(data, 0, data_len); 1116 xfree(data); 1117} 1118static void 1119client_input_exit_status(int type, u_int32_t seq, void *ctxt) 1120{ 1121 exit_status = packet_get_int(); 1122 packet_check_eom(); 1123 /* Acknowledge the exit. */ 1124 packet_start(SSH_CMSG_EXIT_CONFIRMATION); 1125 packet_send(); 1126 /* 1127 * Must wait for packet to be sent since we are 1128 * exiting the loop. 1129 */ 1130 packet_write_wait(); 1131 /* Flag that we want to exit. */ 1132 quit_pending = 1; 1133} 1134 1135static Channel * 1136client_request_forwarded_tcpip(const char *request_type, int rchan) 1137{ 1138 Channel *c = NULL; 1139 char *listen_address, *originator_address; 1140 int listen_port, originator_port; 1141 int sock; 1142 1143 /* Get rest of the packet */ 1144 listen_address = packet_get_string(NULL); 1145 listen_port = packet_get_int(); 1146 originator_address = packet_get_string(NULL); 1147 originator_port = packet_get_int(); 1148 packet_check_eom(); 1149 1150 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", 1151 listen_address, listen_port, originator_address, originator_port); 1152 1153 sock = channel_connect_by_listen_address(listen_port); 1154 if (sock < 0) { 1155 xfree(originator_address); 1156 xfree(listen_address); 1157 return NULL; 1158 } 1159 c = channel_new("forwarded-tcpip", 1160 SSH_CHANNEL_CONNECTING, sock, sock, -1, 1161 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, 1162 originator_address, 1); 1163 xfree(originator_address); 1164 xfree(listen_address); 1165 return c; 1166} 1167 1168static Channel * 1169client_request_x11(const char *request_type, int rchan) 1170{ 1171 Channel *c = NULL; 1172 char *originator; 1173 int originator_port; 1174 int sock; 1175 1176 if (!options.forward_x11) { 1177 error("Warning: ssh server tried X11 forwarding."); 1178 error("Warning: this is probably a break in attempt by a malicious server."); 1179 return NULL; 1180 } 1181 originator = packet_get_string(NULL); 1182 if (datafellows & SSH_BUG_X11FWD) { 1183 debug2("buggy server: x11 request w/o originator_port"); 1184 originator_port = 0; 1185 } else { 1186 originator_port = packet_get_int(); 1187 } 1188 packet_check_eom(); 1189 /* XXX check permission */ 1190 debug("client_request_x11: request from %s %d", originator, 1191 originator_port); 1192 xfree(originator); 1193 sock = x11_connect_display(); 1194 if (sock < 0) 1195 return NULL; 1196 c = channel_new("x11", 1197 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 1198 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); 1199 c->force_drain = 1; 1200 return c; 1201} 1202 1203static Channel * 1204client_request_agent(const char *request_type, int rchan) 1205{ 1206 Channel *c = NULL; 1207 int sock; 1208 1209 if (!options.forward_agent) { 1210 error("Warning: ssh server tried agent forwarding."); 1211 error("Warning: this is probably a break in attempt by a malicious server."); 1212 return NULL; 1213 } 1214 sock = ssh_get_authentication_socket(); 1215 if (sock < 0) 1216 return NULL; 1217 c = channel_new("authentication agent connection", 1218 SSH_CHANNEL_OPEN, sock, sock, -1, 1219 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, 1220 "authentication agent connection", 1); 1221 c->force_drain = 1; 1222 return c; 1223} 1224 1225/* XXXX move to generic input handler */ 1226static void 1227client_input_channel_open(int type, u_int32_t seq, void *ctxt) 1228{ 1229 Channel *c = NULL; 1230 char *ctype; 1231 int rchan; 1232 u_int rmaxpack, rwindow, len; 1233 1234 ctype = packet_get_string(&len); 1235 rchan = packet_get_int(); 1236 rwindow = packet_get_int(); 1237 rmaxpack = packet_get_int(); 1238 1239 debug("client_input_channel_open: ctype %s rchan %d win %d max %d", 1240 ctype, rchan, rwindow, rmaxpack); 1241 1242 if (strcmp(ctype, "forwarded-tcpip") == 0) { 1243 c = client_request_forwarded_tcpip(ctype, rchan); 1244 } else if (strcmp(ctype, "x11") == 0) { 1245 c = client_request_x11(ctype, rchan); 1246 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { 1247 c = client_request_agent(ctype, rchan); 1248 } 1249/* XXX duplicate : */ 1250 if (c != NULL) { 1251 debug("confirm %s", ctype); 1252 c->remote_id = rchan; 1253 c->remote_window = rwindow; 1254 c->remote_maxpacket = rmaxpack; 1255 if (c->type != SSH_CHANNEL_CONNECTING) { 1256 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); 1257 packet_put_int(c->remote_id); 1258 packet_put_int(c->self); 1259 packet_put_int(c->local_window); 1260 packet_put_int(c->local_maxpacket); 1261 packet_send(); 1262 } 1263 } else { 1264 debug("failure %s", ctype); 1265 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); 1266 packet_put_int(rchan); 1267 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); 1268 if (!(datafellows & SSH_BUG_OPENFAILURE)) { 1269 packet_put_cstring("open failed"); 1270 packet_put_cstring(""); 1271 } 1272 packet_send(); 1273 } 1274 xfree(ctype); 1275} 1276static void 1277client_input_channel_req(int type, u_int32_t seq, void *ctxt) 1278{ 1279 Channel *c = NULL; 1280 int id, reply, success = 0; 1281 char *rtype; 1282 1283 id = packet_get_int(); 1284 rtype = packet_get_string(NULL); 1285 reply = packet_get_char(); 1286 1287 debug("client_input_channel_req: channel %d rtype %s reply %d", 1288 id, rtype, reply); 1289 1290 if (session_ident == -1) { 1291 error("client_input_channel_req: no channel %d", session_ident); 1292 } else if (id != session_ident) { 1293 error("client_input_channel_req: channel %d: wrong channel: %d", 1294 session_ident, id); 1295 } 1296 c = channel_lookup(id); 1297 if (c == NULL) { 1298 error("client_input_channel_req: channel %d: unknown channel", id); 1299 } else if (strcmp(rtype, "exit-status") == 0) { 1300 success = 1; 1301 exit_status = packet_get_int(); 1302 packet_check_eom(); 1303 } 1304 if (reply) { 1305 packet_start(success ? 1306 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); 1307 packet_put_int(c->remote_id); 1308 packet_send(); 1309 } 1310 xfree(rtype); 1311} 1312static void 1313client_input_global_request(int type, u_int32_t seq, void *ctxt) 1314{ 1315 char *rtype; 1316 int want_reply; 1317 int success = 0; 1318 1319 rtype = packet_get_string(NULL); 1320 want_reply = packet_get_char(); 1321 debug("client_input_global_request: rtype %s want_reply %d", rtype, want_reply); 1322 if (want_reply) { 1323 packet_start(success ? 1324 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); 1325 packet_send(); 1326 packet_write_wait(); 1327 } 1328 xfree(rtype); 1329} 1330 1331static void 1332client_init_dispatch_20(void) 1333{ 1334 dispatch_init(&dispatch_protocol_error); 1335 1336 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); 1337 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); 1338 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); 1339 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); 1340 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); 1341 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 1342 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 1343 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); 1344 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); 1345 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); 1346 1347 /* rekeying */ 1348 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); 1349 1350 /* global request reply messages */ 1351 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); 1352 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); 1353} 1354static void 1355client_init_dispatch_13(void) 1356{ 1357 dispatch_init(NULL); 1358 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); 1359 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); 1360 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); 1361 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 1362 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 1363 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); 1364 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); 1365 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); 1366 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); 1367 1368 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? 1369 &auth_input_open_request : &deny_input_open); 1370 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? 1371 &x11_input_open : &deny_input_open); 1372} 1373static void 1374client_init_dispatch_15(void) 1375{ 1376 client_init_dispatch_13(); 1377 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); 1378 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); 1379} 1380static void 1381client_init_dispatch(void) 1382{ 1383 if (compat20) 1384 client_init_dispatch_20(); 1385 else if (compat13) 1386 client_init_dispatch_13(); 1387 else 1388 client_init_dispatch_15(); 1389} 1390