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 1.104 2002/08/22 19:38:42 stevesk 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 */ 87 extern Options options; 88 89 /* Flag indicating that stdin should be redirected from /dev/null. */ 90 extern 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 */ 97 extern 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 */ 105 static volatile sig_atomic_t received_window_change_signal = 0; 106 static volatile sig_atomic_t received_signal = 0; 107 108 /* Flag indicating whether the user\'s terminal is in non-blocking mode. */ 109 static int in_non_blocking_mode = 0; 110 111 /* Common data for the client loop code. */ 112 static int quit_pending; /* Set to non-zero to quit the client loop. */ 113 static int escape_char; /* Escape character. */ 114 static int escape_pending; /* Last character was the escape character */ 115 static int last_was_cr; /* Last character was a newline. */ 116 static int exit_status; /* Used to store the exit status of the command. */ 117 static int stdin_eof; /* EOF has been encountered on standard error. */ 118 static Buffer stdin_buffer; /* Buffer for stdin data. */ 119 static Buffer stdout_buffer; /* Buffer for stdout data. */ 120 static Buffer stderr_buffer; /* Buffer for stderr data. */ 121 static u_long stdin_bytes, stdout_bytes, stderr_bytes; 122 static u_int buffer_high;/* Soft max buffer size. */ 123 static int connection_in; /* Connection to server (input). */ 124 static int connection_out; /* Connection to server (output). */ 125 static int need_rekeying; /* Set to non-zero if rekeying is requested. */ 126 static int session_closed = 0; /* In SSH2: login session closed. */ 127 128 static void client_init_dispatch(void); 129 int session_ident = -1; 130 131 /*XXX*/ 132 extern Kex *xxx_kex; 133 134 /* Restores stdin to blocking mode. */ 135 136 static void 137 leave_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. */ 147 148 static void 149 enter_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 */ 160 161 static void 162 window_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 */ 172 173 static void 174 signal_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 */ 184 185 static double 186 get_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 */ 198 199 static void 200 client_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 */ 250 251 static void 252 client_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 */ 282 283 static void 284 client_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 */ 319 320 static void 321 client_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 } 390 391 static void 392 client_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(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); 399 if (buffer_len(berr) > 0) 400 atomicio(write, 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 } 433 434 static void 435 client_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 } 473 474 static void 475 process_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 log("Invalid command."); 494 goto out; 495 } 496 if (s[1] == 'L') 497 local = 1; 498 if (!local && !compat20) { 499 log("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 log("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 log("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 log("Port forwarding failed."); 522 goto out; 523 } 524 } else 525 channel_request_remote_forwarding(fwd_port, buf, 526 fwd_host_port); 527 log("Forwarding port."); 528 out: 529 signal(SIGINT, handler); 530 enter_raw_mode(); 531 if (cmd) 532 xfree(cmd); 533 } 534 535 /* process the characters one by one */ 536 static int 537 process_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 'R': 578 if (compat20) { 579 if (datafellows & SSH_BUG_NOREKEY) 580 log("Server does not support re-keying"); 581 else 582 need_rekeying = 1; 583 } 584 continue; 585 586 case '&': 587 /* 588 * Detach the program (continue to serve connections, 589 * but put in background and no more new connections). 590 */ 591 /* Restore tty modes. */ 592 leave_raw_mode(); 593 594 /* Stop listening for new connections. */ 595 channel_stop_listening(); 596 597 snprintf(string, sizeof string, 598 "%c& [backgrounded]\n", escape_char); 599 buffer_append(berr, string, strlen(string)); 600 601 /* Fork into background. */ 602 pid = fork(); 603 if (pid < 0) { 604 error("fork: %.100s", strerror(errno)); 605 continue; 606 } 607 if (pid != 0) { /* This is the parent. */ 608 /* The parent just exits. */ 609 exit(0); 610 } 611 /* The child continues serving connections. */ 612 if (compat20) { 613 buffer_append(bin, "\004", 1); 614 /* fake EOF on stdin */ 615 return -1; 616 } else if (!stdin_eof) { 617 /* 618 * Sending SSH_CMSG_EOF alone does not always appear 619 * to be enough. So we try to send an EOF character 620 * first. 621 */ 622 packet_start(SSH_CMSG_STDIN_DATA); 623 packet_put_string("\004", 1); 624 packet_send(); 625 /* Close stdin. */ 626 stdin_eof = 1; 627 if (buffer_len(bin) == 0) { 628 packet_start(SSH_CMSG_EOF); 629 packet_send(); 630 } 631 } 632 continue; 633 634 case '?': 635 snprintf(string, sizeof string, 636 "%c?\r\n\ 637 Supported escape sequences:\r\n\ 638 %c. - terminate connection\r\n\ 639 %cC - open a command line\r\n\ 640 %cR - Request rekey (SSH protocol 2 only)\r\n\ 641 %c^Z - suspend ssh\r\n\ 642 %c# - list forwarded connections\r\n\ 643 %c& - background ssh (when waiting for connections to terminate)\r\n\ 644 %c? - this message\r\n\ 645 %c%c - send the escape character by typing it twice\r\n\ 646 (Note that escapes are only recognized immediately after newline.)\r\n", 647 escape_char, escape_char, escape_char, escape_char, 648 escape_char, escape_char, escape_char, escape_char, 649 escape_char, escape_char); 650 buffer_append(berr, string, strlen(string)); 651 continue; 652 653 case '#': 654 snprintf(string, sizeof string, "%c#\r\n", escape_char); 655 buffer_append(berr, string, strlen(string)); 656 s = channel_open_message(); 657 buffer_append(berr, s, strlen(s)); 658 xfree(s); 659 continue; 660 661 case 'C': 662 process_cmdline(); 663 continue; 664 665 default: 666 if (ch != escape_char) { 667 buffer_put_char(bin, escape_char); 668 bytes++; 669 } 670 /* Escaped characters fall through here */ 671 break; 672 } 673 } else { 674 /* 675 * The previous character was not an escape char. Check if this 676 * is an escape. 677 */ 678 if (last_was_cr && ch == escape_char) { 679 /* It is. Set the flag and continue to next character. */ 680 escape_pending = 1; 681 continue; 682 } 683 } 684 685 /* 686 * Normal character. Record whether it was a newline, 687 * and append it to the buffer. 688 */ 689 last_was_cr = (ch == '\r' || ch == '\n'); 690 buffer_put_char(bin, ch); 691 bytes++; 692 } 693 return bytes; 694 } 695 696 static void 697 client_process_input(fd_set * readset) 698 { 699 int len; 700 char buf[8192]; 701 702 /* Read input from stdin. */ 703 if (FD_ISSET(fileno(stdin), readset)) { 704 /* Read as much as possible. */ 705 len = read(fileno(stdin), buf, sizeof(buf)); 706 if (len < 0 && (errno == EAGAIN || errno == EINTR)) 707 return; /* we'll try again later */ 708 if (len <= 0) { 709 /* 710 * Received EOF or error. They are treated 711 * similarly, except that an error message is printed 712 * if it was an error condition. 713 */ 714 if (len < 0) { 715 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); 716 buffer_append(&stderr_buffer, buf, strlen(buf)); 717 } 718 /* Mark that we have seen EOF. */ 719 stdin_eof = 1; 720 /* 721 * Send an EOF message to the server unless there is 722 * data in the buffer. If there is data in the 723 * buffer, no message will be sent now. Code 724 * elsewhere will send the EOF when the buffer 725 * becomes empty if stdin_eof is set. 726 */ 727 if (buffer_len(&stdin_buffer) == 0) { 728 packet_start(SSH_CMSG_EOF); 729 packet_send(); 730 } 731 } else if (escape_char == SSH_ESCAPECHAR_NONE) { 732 /* 733 * Normal successful read, and no escape character. 734 * Just append the data to buffer. 735 */ 736 buffer_append(&stdin_buffer, buf, len); 737 } else { 738 /* 739 * Normal, successful read. But we have an escape character 740 * and have to process the characters one by one. 741 */ 742 if (process_escapes(&stdin_buffer, &stdout_buffer, 743 &stderr_buffer, buf, len) == -1) 744 return; 745 } 746 } 747 } 748 749 static void 750 client_process_output(fd_set * writeset) 751 { 752 int len; 753 char buf[100]; 754 755 /* Write buffered output to stdout. */ 756 if (FD_ISSET(fileno(stdout), writeset)) { 757 /* Write as much data as possible. */ 758 len = write(fileno(stdout), buffer_ptr(&stdout_buffer), 759 buffer_len(&stdout_buffer)); 760 if (len <= 0) { 761 if (errno == EINTR || errno == EAGAIN) 762 len = 0; 763 else { 764 /* 765 * An error or EOF was encountered. Put an 766 * error message to stderr buffer. 767 */ 768 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); 769 buffer_append(&stderr_buffer, buf, strlen(buf)); 770 quit_pending = 1; 771 return; 772 } 773 } 774 /* Consume printed data from the buffer. */ 775 buffer_consume(&stdout_buffer, len); 776 stdout_bytes += len; 777 } 778 /* Write buffered output to stderr. */ 779 if (FD_ISSET(fileno(stderr), writeset)) { 780 /* Write as much data as possible. */ 781 len = write(fileno(stderr), buffer_ptr(&stderr_buffer), 782 buffer_len(&stderr_buffer)); 783 if (len <= 0) { 784 if (errno == EINTR || errno == EAGAIN) 785 len = 0; 786 else { 787 /* EOF or error, but can't even print error message. */ 788 quit_pending = 1; 789 return; 790 } 791 } 792 /* Consume printed characters from the buffer. */ 793 buffer_consume(&stderr_buffer, len); 794 stderr_bytes += len; 795 } 796 } 797 798 /* 799 * Get packets from the connection input buffer, and process them as long as 800 * there are packets available. 801 * 802 * Any unknown packets received during the actual 803 * session cause the session to terminate. This is 804 * intended to make debugging easier since no 805 * confirmations are sent. Any compatible protocol 806 * extensions must be negotiated during the 807 * preparatory phase. 808 */ 809 810 static void 811 client_process_buffered_input_packets(void) 812 { 813 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); 814 } 815 816 /* scan buf[] for '~' before sending data to the peer */ 817 818 static int 819 simple_escape_filter(Channel *c, char *buf, int len) 820 { 821 /* XXX we assume c->extended is writeable */ 822 return process_escapes(&c->input, &c->output, &c->extended, buf, len); 823 } 824 825 static void 826 client_channel_closed(int id, void *arg) 827 { 828 if (id != session_ident) 829 error("client_channel_closed: id %d != session_ident %d", 830 id, session_ident); 831 channel_cancel_cleanup(id); 832 session_closed = 1; 833 if (in_raw_mode()) 834 leave_raw_mode(); 835 } 836 837 /* 838 * Implements the interactive session with the server. This is called after 839 * the user has been authenticated, and a command has been started on the 840 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character 841 * used as an escape character for terminating or suspending the session. 842 */ 843 844 int 845 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) 846 { 847 fd_set *readset = NULL, *writeset = NULL; 848 double start_time, total_time; 849 int max_fd = 0, max_fd2 = 0, len, rekeying = 0, nalloc = 0; 850 char buf[100]; 851 852 debug("Entering interactive session."); 853 854 start_time = get_current_time(); 855 856 /* Initialize variables. */ 857 escape_pending = 0; 858 last_was_cr = 1; 859 exit_status = -1; 860 stdin_eof = 0; 861 buffer_high = 64 * 1024; 862 connection_in = packet_get_connection_in(); 863 connection_out = packet_get_connection_out(); 864 max_fd = MAX(connection_in, connection_out); 865 866 if (!compat20) { 867 /* enable nonblocking unless tty */ 868 if (!isatty(fileno(stdin))) 869 set_nonblock(fileno(stdin)); 870 if (!isatty(fileno(stdout))) 871 set_nonblock(fileno(stdout)); 872 if (!isatty(fileno(stderr))) 873 set_nonblock(fileno(stderr)); 874 max_fd = MAX(max_fd, fileno(stdin)); 875 max_fd = MAX(max_fd, fileno(stdout)); 876 max_fd = MAX(max_fd, fileno(stderr)); 877 } 878 stdin_bytes = 0; 879 stdout_bytes = 0; 880 stderr_bytes = 0; 881 quit_pending = 0; 882 escape_char = escape_char_arg; 883 884 /* Initialize buffers. */ 885 buffer_init(&stdin_buffer); 886 buffer_init(&stdout_buffer); 887 buffer_init(&stderr_buffer); 888 889 client_init_dispatch(); 890 891 /* Set signal handlers to restore non-blocking mode. */ 892 signal(SIGINT, signal_handler); 893 signal(SIGQUIT, signal_handler); 894 signal(SIGTERM, signal_handler); 895 if (have_pty) 896 signal(SIGWINCH, window_change_handler); 897 898 if (have_pty) 899 enter_raw_mode(); 900 901 if (compat20) { 902 session_ident = ssh2_chan_id; 903 if (escape_char != SSH_ESCAPECHAR_NONE) 904 channel_register_filter(session_ident, 905 simple_escape_filter); 906 if (session_ident != -1) 907 channel_register_cleanup(session_ident, 908 client_channel_closed); 909 } else { 910 /* Check if we should immediately send eof on stdin. */ 911 client_check_initial_eof_on_stdin(); 912 } 913 914 /* Main loop of the client for the interactive session mode. */ 915 while (!quit_pending) { 916 917 /* Process buffered packets sent by the server. */ 918 client_process_buffered_input_packets(); 919 920 if (compat20 && session_closed && !channel_still_open()) 921 break; 922 923 rekeying = (xxx_kex != NULL && !xxx_kex->done); 924 925 if (rekeying) { 926 debug("rekeying in progress"); 927 } else { 928 /* 929 * Make packets of buffered stdin data, and buffer 930 * them for sending to the server. 931 */ 932 if (!compat20) 933 client_make_packets_from_stdin_data(); 934 935 /* 936 * Make packets from buffered channel data, and 937 * enqueue them for sending to the server. 938 */ 939 if (packet_not_very_much_data_to_write()) 940 channel_output_poll(); 941 942 /* 943 * Check if the window size has changed, and buffer a 944 * message about it to the server if so. 945 */ 946 client_check_window_change(); 947 948 if (quit_pending) 949 break; 950 } 951 /* 952 * Wait until we have something to do (something becomes 953 * available on one of the descriptors). 954 */ 955 max_fd2 = max_fd; 956 client_wait_until_can_do_something(&readset, &writeset, 957 &max_fd2, &nalloc, rekeying); 958 959 if (quit_pending) 960 break; 961 962 /* Do channel operations unless rekeying in progress. */ 963 if (!rekeying) { 964 channel_after_select(readset, writeset); 965 966 if (need_rekeying) { 967 debug("user requests rekeying"); 968 xxx_kex->done = 0; 969 kex_send_kexinit(xxx_kex); 970 need_rekeying = 0; 971 } 972 } 973 974 /* Buffer input from the connection. */ 975 client_process_net_input(readset); 976 977 if (quit_pending) 978 break; 979 980 if (!compat20) { 981 /* Buffer data from stdin */ 982 client_process_input(readset); 983 /* 984 * Process output to stdout and stderr. Output to 985 * the connection is processed elsewhere (above). 986 */ 987 client_process_output(writeset); 988 } 989 990 /* Send as much buffered packet data as possible to the sender. */ 991 if (FD_ISSET(connection_out, writeset)) 992 packet_write_poll(); 993 } 994 if (readset) 995 xfree(readset); 996 if (writeset) 997 xfree(writeset); 998 999 /* Terminate the session. */ 1000 1001 /* Stop watching for window change. */ 1002 if (have_pty) 1003 signal(SIGWINCH, SIG_DFL); 1004 1005 channel_free_all(); 1006 1007 if (have_pty) 1008 leave_raw_mode(); 1009 1010 /* restore blocking io */ 1011 if (!isatty(fileno(stdin))) 1012 unset_nonblock(fileno(stdin)); 1013 if (!isatty(fileno(stdout))) 1014 unset_nonblock(fileno(stdout)); 1015 if (!isatty(fileno(stderr))) 1016 unset_nonblock(fileno(stderr)); 1017 1018 if (received_signal) { 1019 if (in_non_blocking_mode) /* XXX */ 1020 leave_non_blocking(); 1021 fatal("Killed by signal %d.", (int) received_signal); 1022 } 1023 1024 /* 1025 * In interactive mode (with pseudo tty) display a message indicating 1026 * that the connection has been closed. 1027 */ 1028 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { 1029 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); 1030 buffer_append(&stderr_buffer, buf, strlen(buf)); 1031 } 1032 1033 /* Output any buffered data for stdout. */ 1034 while (buffer_len(&stdout_buffer) > 0) { 1035 len = write(fileno(stdout), buffer_ptr(&stdout_buffer), 1036 buffer_len(&stdout_buffer)); 1037 if (len <= 0) { 1038 error("Write failed flushing stdout buffer."); 1039 break; 1040 } 1041 buffer_consume(&stdout_buffer, len); 1042 stdout_bytes += len; 1043 } 1044 1045 /* Output any buffered data for stderr. */ 1046 while (buffer_len(&stderr_buffer) > 0) { 1047 len = write(fileno(stderr), buffer_ptr(&stderr_buffer), 1048 buffer_len(&stderr_buffer)); 1049 if (len <= 0) { 1050 error("Write failed flushing stderr buffer."); 1051 break; 1052 } 1053 buffer_consume(&stderr_buffer, len); 1054 stderr_bytes += len; 1055 } 1056 1057 /* Clear and free any buffers. */ 1058 memset(buf, 0, sizeof(buf)); 1059 buffer_free(&stdin_buffer); 1060 buffer_free(&stdout_buffer); 1061 buffer_free(&stderr_buffer); 1062 1063 /* Report bytes transferred, and transfer rates. */ 1064 total_time = get_current_time() - start_time; 1065 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", 1066 stdin_bytes, stdout_bytes, stderr_bytes, total_time); 1067 if (total_time > 0) 1068 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", 1069 stdin_bytes / total_time, stdout_bytes / total_time, 1070 stderr_bytes / total_time); 1071 1072 /* Return the exit status of the program. */ 1073 debug("Exit status %d", exit_status); 1074 return exit_status; 1075 } 1076 1077 /*********/ 1078 1079 static void 1080 client_input_stdout_data(int type, u_int32_t seq, void *ctxt) 1081 { 1082 u_int data_len; 1083 char *data = packet_get_string(&data_len); 1084 packet_check_eom(); 1085 buffer_append(&stdout_buffer, data, data_len); 1086 memset(data, 0, data_len); 1087 xfree(data); 1088 } 1089 static void 1090 client_input_stderr_data(int type, u_int32_t seq, void *ctxt) 1091 { 1092 u_int data_len; 1093 char *data = packet_get_string(&data_len); 1094 packet_check_eom(); 1095 buffer_append(&stderr_buffer, data, data_len); 1096 memset(data, 0, data_len); 1097 xfree(data); 1098 } 1099 static void 1100 client_input_exit_status(int type, u_int32_t seq, void *ctxt) 1101 { 1102 exit_status = packet_get_int(); 1103 packet_check_eom(); 1104 /* Acknowledge the exit. */ 1105 packet_start(SSH_CMSG_EXIT_CONFIRMATION); 1106 packet_send(); 1107 /* 1108 * Must wait for packet to be sent since we are 1109 * exiting the loop. 1110 */ 1111 packet_write_wait(); 1112 /* Flag that we want to exit. */ 1113 quit_pending = 1; 1114 } 1115 1116 static Channel * 1117 client_request_forwarded_tcpip(const char *request_type, int rchan) 1118 { 1119 Channel *c = NULL; 1120 char *listen_address, *originator_address; 1121 int listen_port, originator_port; 1122 int sock; 1123 1124 /* Get rest of the packet */ 1125 listen_address = packet_get_string(NULL); 1126 listen_port = packet_get_int(); 1127 originator_address = packet_get_string(NULL); 1128 originator_port = packet_get_int(); 1129 packet_check_eom(); 1130 1131 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", 1132 listen_address, listen_port, originator_address, originator_port); 1133 1134 sock = channel_connect_by_listen_address(listen_port); 1135 if (sock < 0) { 1136 xfree(originator_address); 1137 xfree(listen_address); 1138 return NULL; 1139 } 1140 c = channel_new("forwarded-tcpip", 1141 SSH_CHANNEL_CONNECTING, sock, sock, -1, 1142 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, 1143 xstrdup(originator_address), 1); 1144 xfree(originator_address); 1145 xfree(listen_address); 1146 return c; 1147 } 1148 1149 static Channel * 1150 client_request_x11(const char *request_type, int rchan) 1151 { 1152 Channel *c = NULL; 1153 char *originator; 1154 int originator_port; 1155 int sock; 1156 1157 if (!options.forward_x11) { 1158 error("Warning: ssh server tried X11 forwarding."); 1159 error("Warning: this is probably a break in attempt by a malicious server."); 1160 return NULL; 1161 } 1162 originator = packet_get_string(NULL); 1163 if (datafellows & SSH_BUG_X11FWD) { 1164 debug2("buggy server: x11 request w/o originator_port"); 1165 originator_port = 0; 1166 } else { 1167 originator_port = packet_get_int(); 1168 } 1169 packet_check_eom(); 1170 /* XXX check permission */ 1171 debug("client_request_x11: request from %s %d", originator, 1172 originator_port); 1173 xfree(originator); 1174 sock = x11_connect_display(); 1175 if (sock < 0) 1176 return NULL; 1177 c = channel_new("x11", 1178 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 1179 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, 1180 xstrdup("x11"), 1); 1181 c->force_drain = 1; 1182 return c; 1183 } 1184 1185 static Channel * 1186 client_request_agent(const char *request_type, int rchan) 1187 { 1188 Channel *c = NULL; 1189 int sock; 1190 1191 if (!options.forward_agent) { 1192 error("Warning: ssh server tried agent forwarding."); 1193 error("Warning: this is probably a break in attempt by a malicious server."); 1194 return NULL; 1195 } 1196 sock = ssh_get_authentication_socket(); 1197 if (sock < 0) 1198 return NULL; 1199 c = channel_new("authentication agent connection", 1200 SSH_CHANNEL_OPEN, sock, sock, -1, 1201 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, 1202 xstrdup("authentication agent connection"), 1); 1203 c->force_drain = 1; 1204 return c; 1205 } 1206 1207 /* XXXX move to generic input handler */ 1208 static void 1209 client_input_channel_open(int type, u_int32_t seq, void *ctxt) 1210 { 1211 Channel *c = NULL; 1212 char *ctype; 1213 int rchan; 1214 u_int rmaxpack, rwindow, len; 1215 1216 ctype = packet_get_string(&len); 1217 rchan = packet_get_int(); 1218 rwindow = packet_get_int(); 1219 rmaxpack = packet_get_int(); 1220 1221 debug("client_input_channel_open: ctype %s rchan %d win %d max %d", 1222 ctype, rchan, rwindow, rmaxpack); 1223 1224 if (strcmp(ctype, "forwarded-tcpip") == 0) { 1225 c = client_request_forwarded_tcpip(ctype, rchan); 1226 } else if (strcmp(ctype, "x11") == 0) { 1227 c = client_request_x11(ctype, rchan); 1228 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { 1229 c = client_request_agent(ctype, rchan); 1230 } 1231 /* XXX duplicate : */ 1232 if (c != NULL) { 1233 debug("confirm %s", ctype); 1234 c->remote_id = rchan; 1235 c->remote_window = rwindow; 1236 c->remote_maxpacket = rmaxpack; 1237 if (c->type != SSH_CHANNEL_CONNECTING) { 1238 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); 1239 packet_put_int(c->remote_id); 1240 packet_put_int(c->self); 1241 packet_put_int(c->local_window); 1242 packet_put_int(c->local_maxpacket); 1243 packet_send(); 1244 } 1245 } else { 1246 debug("failure %s", ctype); 1247 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); 1248 packet_put_int(rchan); 1249 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); 1250 if (!(datafellows & SSH_BUG_OPENFAILURE)) { 1251 packet_put_cstring("open failed"); 1252 packet_put_cstring(""); 1253 } 1254 packet_send(); 1255 } 1256 xfree(ctype); 1257 } 1258 static void 1259 client_input_channel_req(int type, u_int32_t seq, void *ctxt) 1260 { 1261 Channel *c = NULL; 1262 int id, reply, success = 0; 1263 char *rtype; 1264 1265 id = packet_get_int(); 1266 rtype = packet_get_string(NULL); 1267 reply = packet_get_char(); 1268 1269 debug("client_input_channel_req: channel %d rtype %s reply %d", 1270 id, rtype, reply); 1271 1272 if (session_ident == -1) { 1273 error("client_input_channel_req: no channel %d", session_ident); 1274 } else if (id != session_ident) { 1275 error("client_input_channel_req: channel %d: wrong channel: %d", 1276 session_ident, id); 1277 } 1278 c = channel_lookup(id); 1279 if (c == NULL) { 1280 error("client_input_channel_req: channel %d: unknown channel", id); 1281 } else if (strcmp(rtype, "exit-status") == 0) { 1282 success = 1; 1283 exit_status = packet_get_int(); 1284 packet_check_eom(); 1285 } 1286 if (reply) { 1287 packet_start(success ? 1288 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); 1289 packet_put_int(c->remote_id); 1290 packet_send(); 1291 } 1292 xfree(rtype); 1293 } 1294 static void 1295 client_input_global_request(int type, u_int32_t seq, void *ctxt) 1296 { 1297 char *rtype; 1298 int want_reply; 1299 int success = 0; 1300 1301 rtype = packet_get_string(NULL); 1302 want_reply = packet_get_char(); 1303 debug("client_input_global_request: rtype %s want_reply %d", rtype, want_reply); 1304 if (want_reply) { 1305 packet_start(success ? 1306 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); 1307 packet_send(); 1308 packet_write_wait(); 1309 } 1310 xfree(rtype); 1311 } 1312 1313 static void 1314 client_init_dispatch_20(void) 1315 { 1316 dispatch_init(&dispatch_protocol_error); 1317 1318 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); 1319 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); 1320 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); 1321 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); 1322 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); 1323 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 1324 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 1325 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); 1326 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); 1327 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); 1328 1329 /* rekeying */ 1330 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); 1331 1332 /* global request reply messages */ 1333 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); 1334 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); 1335 } 1336 static void 1337 client_init_dispatch_13(void) 1338 { 1339 dispatch_init(NULL); 1340 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); 1341 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); 1342 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); 1343 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 1344 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 1345 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); 1346 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); 1347 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); 1348 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); 1349 1350 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? 1351 &auth_input_open_request : &deny_input_open); 1352 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? 1353 &x11_input_open : &deny_input_open); 1354 } 1355 static void 1356 client_init_dispatch_15(void) 1357 { 1358 client_init_dispatch_13(); 1359 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); 1360 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); 1361 } 1362 static void 1363 client_init_dispatch(void) 1364 { 1365 if (compat20) 1366 client_init_dispatch_20(); 1367 else if (compat13) 1368 client_init_dispatch_13(); 1369 else 1370 client_init_dispatch_15(); 1371 } 1372