1 /* 2 * Copyright (c) 1988, 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if 0 31 #ifndef lint 32 static const char sccsid[] = "@(#)telnet.c 8.4 (Berkeley) 5/30/95"; 33 #endif 34 #endif 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/types.h> 39 40 /* By the way, we need to include curses.h before telnet.h since, 41 * among other things, telnet.h #defines 'DO', which is a variable 42 * declared in curses.h. 43 */ 44 45 #include <ctype.h> 46 #include <curses.h> 47 #include <signal.h> 48 #include <stdlib.h> 49 #include <term.h> 50 #include <unistd.h> 51 #include <arpa/inet.h> 52 #include <arpa/telnet.h> 53 54 #include "ring.h" 55 56 #include "defines.h" 57 #include "externs.h" 58 #include "types.h" 59 #include "general.h" 60 61 #ifdef AUTHENTICATION 62 #include <libtelnet/auth.h> 63 #endif 64 #ifdef ENCRYPTION 65 #include <libtelnet/encrypt.h> 66 #endif 67 #include <libtelnet/misc.h> 68 69 #define strip(x) ((my_want_state_is_wont(TELOPT_BINARY)) ? ((x)&0x7f) : (x)) 70 71 static unsigned char subbuffer[SUBBUFSIZE], 72 *subpointer, *subend; /* buffer for sub-options */ 73 #define SB_CLEAR() subpointer = subbuffer; 74 #define SB_TERM() { subend = subpointer; SB_CLEAR(); } 75 #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \ 76 *subpointer++ = (c); \ 77 } 78 79 #define SB_GET() ((*subpointer++)&0xff) 80 #define SB_PEEK() ((*subpointer)&0xff) 81 #define SB_EOF() (subpointer >= subend) 82 #define SB_LEN() (subend - subpointer) 83 84 char options[256]; /* The combined options */ 85 char do_dont_resp[256]; 86 char will_wont_resp[256]; 87 88 int 89 eight = 0, 90 autologin = 0, /* Autologin anyone? */ 91 skiprc = 0, 92 connected, 93 showoptions, 94 ISend, /* trying to send network data in */ 95 telnet_debug = 0, 96 crmod, 97 netdata, /* Print out network data flow */ 98 crlf, /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */ 99 telnetport, 100 SYNCHing, /* we are in TELNET SYNCH mode */ 101 flushout, /* flush output */ 102 autoflush = 0, /* flush output when interrupting? */ 103 autosynch, /* send interrupt characters with SYNCH? */ 104 localflow, /* we handle flow control locally */ 105 restartany, /* if flow control enabled, restart on any character */ 106 localchars, /* we recognize interrupt/quit */ 107 donelclchars, /* the user has set "localchars" */ 108 donebinarytoggle, /* the user has put us in binary */ 109 dontlecho, /* do we suppress local echoing right now? */ 110 globalmode, 111 doaddrlookup = 1, /* do a reverse address lookup? */ 112 clienteof = 0; 113 114 char *prompt = 0; 115 #ifdef ENCRYPTION 116 char *line; /* hack around breakage in sra.c :-( !! */ 117 #endif 118 119 cc_t escape; 120 cc_t rlogin; 121 #ifdef KLUDGELINEMODE 122 cc_t echoc; 123 #endif 124 125 /* 126 * Telnet receiver states for fsm 127 */ 128 #define TS_DATA 0 129 #define TS_IAC 1 130 #define TS_WILL 2 131 #define TS_WONT 3 132 #define TS_DO 4 133 #define TS_DONT 5 134 #define TS_CR 6 135 #define TS_SB 7 /* sub-option collection */ 136 #define TS_SE 8 /* looking for sub-option end */ 137 138 static int telrcv_state; 139 #ifdef OLD_ENVIRON 140 unsigned char telopt_environ = TELOPT_NEW_ENVIRON; 141 #else 142 # define telopt_environ TELOPT_NEW_ENVIRON 143 #endif 144 145 jmp_buf toplevel; 146 147 int flushline; 148 int linemode; 149 150 #ifdef KLUDGELINEMODE 151 int kludgelinemode = 1; 152 #endif 153 154 static int is_unique(char *, char **, char **); 155 156 /* 157 * The following are some clocks used to decide how to interpret 158 * the relationship between various variables. 159 */ 160 161 Clocks clocks; 162 163 /* 164 * Initialize telnet environment. 165 */ 166 167 void 168 init_telnet(void) 169 { 170 env_init(); 171 172 SB_CLEAR(); 173 ClearArray(options); 174 175 connected = ISend = localflow = donebinarytoggle = 0; 176 #ifdef AUTHENTICATION 177 #ifdef ENCRYPTION 178 auth_encrypt_connect(connected); 179 #endif 180 #endif 181 restartany = -1; 182 183 SYNCHing = 0; 184 185 /* Don't change NetTrace */ 186 187 escape = CONTROL(']'); 188 rlogin = _POSIX_VDISABLE; 189 #ifdef KLUDGELINEMODE 190 echoc = CONTROL('E'); 191 #endif 192 193 flushline = 1; 194 telrcv_state = TS_DATA; 195 } 196 197 198 /* 199 * These routines are in charge of sending option negotiations 200 * to the other side. 201 * 202 * The basic idea is that we send the negotiation if either side 203 * is in disagreement as to what the current state should be. 204 */ 205 206 unsigned char ComPortBaudRate[256]; 207 208 void 209 DoBaudRate(char *arg) 210 { 211 char *temp, temp2[10]; 212 int i; 213 uint32_t baudrate; 214 215 errno = 0; 216 baudrate = (uint32_t)strtol(arg, &temp, 10); 217 if (temp[0] != '\0' || (baudrate == 0 && errno != 0)) 218 ExitString("Invalid baud rate provided.\n", 1); 219 220 for (i = 1; termspeeds[i].speed != -1; i++) 221 if (baudrate == termspeeds[i].speed) 222 break; 223 if (termspeeds[i].speed == -1) 224 ExitString("Invalid baud rate provided.\n", 1); 225 226 strlcpy(ComPortBaudRate, arg, sizeof(ComPortBaudRate)); 227 228 if (NETROOM() < sizeof(temp2)) { 229 ExitString("No room in buffer for baud rate.\n", 1); 230 /* NOTREACHED */ 231 } 232 233 snprintf(temp2, sizeof(temp2), "%c%c%c%c....%c%c", IAC, SB, TELOPT_COMPORT, 234 COMPORT_SET_BAUDRATE, IAC, SE); 235 236 baudrate = htonl(baudrate); 237 memcpy(&temp2[4], &baudrate, sizeof(baudrate)); 238 ring_supply_data(&netoring, temp2, sizeof(temp2)); 239 printsub('>', &temp[2], sizeof(temp2) - 2); 240 } 241 242 void 243 send_do(int c, int init) 244 { 245 if (init) { 246 if (((do_dont_resp[c] == 0) && my_state_is_do(c)) || 247 my_want_state_is_do(c)) 248 return; 249 set_my_want_state_do(c); 250 do_dont_resp[c]++; 251 } 252 if (telnetport < 0) 253 return; 254 NET2ADD(IAC, DO); 255 NETADD(c); 256 printoption("SENT", DO, c); 257 } 258 259 void 260 send_dont(int c, int init) 261 { 262 if (init) { 263 if (((do_dont_resp[c] == 0) && my_state_is_dont(c)) || 264 my_want_state_is_dont(c)) 265 return; 266 set_my_want_state_dont(c); 267 do_dont_resp[c]++; 268 } 269 if (telnetport < 0) 270 return; 271 NET2ADD(IAC, DONT); 272 NETADD(c); 273 printoption("SENT", DONT, c); 274 } 275 276 void 277 send_will(int c, int init) 278 { 279 if (init) { 280 if (((will_wont_resp[c] == 0) && my_state_is_will(c)) || 281 my_want_state_is_will(c)) 282 return; 283 set_my_want_state_will(c); 284 will_wont_resp[c]++; 285 } 286 if (telnetport < 0) 287 return; 288 NET2ADD(IAC, WILL); 289 NETADD(c); 290 printoption("SENT", WILL, c); 291 } 292 293 void 294 send_wont(int c, int init) 295 { 296 if (init) { 297 if (((will_wont_resp[c] == 0) && my_state_is_wont(c)) || 298 my_want_state_is_wont(c)) 299 return; 300 set_my_want_state_wont(c); 301 will_wont_resp[c]++; 302 } 303 if (telnetport < 0) 304 return; 305 NET2ADD(IAC, WONT); 306 NETADD(c); 307 printoption("SENT", WONT, c); 308 } 309 310 void 311 willoption(int option) 312 { 313 int new_state_ok = 0; 314 315 if (do_dont_resp[option]) { 316 --do_dont_resp[option]; 317 if (do_dont_resp[option] && my_state_is_do(option)) 318 --do_dont_resp[option]; 319 } 320 321 if ((do_dont_resp[option] == 0) && my_want_state_is_dont(option)) { 322 323 switch (option) { 324 325 case TELOPT_ECHO: 326 case TELOPT_BINARY: 327 case TELOPT_SGA: 328 settimer(modenegotiated); 329 /* FALLTHROUGH */ 330 case TELOPT_STATUS: 331 #ifdef AUTHENTICATION 332 case TELOPT_AUTHENTICATION: 333 #endif 334 #ifdef ENCRYPTION 335 case TELOPT_ENCRYPT: 336 #endif /* ENCRYPTION */ 337 new_state_ok = 1; 338 break; 339 340 case TELOPT_TM: 341 if (flushout) 342 flushout = 0; 343 /* 344 * Special case for TM. If we get back a WILL, 345 * pretend we got back a WONT. 346 */ 347 set_my_want_state_dont(option); 348 set_my_state_dont(option); 349 return; /* Never reply to TM will's/wont's */ 350 351 case TELOPT_LINEMODE: 352 default: 353 break; 354 } 355 356 if (new_state_ok) { 357 set_my_want_state_do(option); 358 send_do(option, 0); 359 setconnmode(0); /* possibly set new tty mode */ 360 } else { 361 do_dont_resp[option]++; 362 send_dont(option, 0); 363 } 364 } 365 set_my_state_do(option); 366 #ifdef ENCRYPTION 367 if (option == TELOPT_ENCRYPT) 368 encrypt_send_support(); 369 #endif /* ENCRYPTION */ 370 } 371 372 void 373 wontoption(int option) 374 { 375 if (do_dont_resp[option]) { 376 --do_dont_resp[option]; 377 if (do_dont_resp[option] && my_state_is_dont(option)) 378 --do_dont_resp[option]; 379 } 380 381 if ((do_dont_resp[option] == 0) && my_want_state_is_do(option)) { 382 383 switch (option) { 384 385 #ifdef KLUDGELINEMODE 386 case TELOPT_SGA: 387 if (!kludgelinemode) 388 break; 389 /* FALLTHROUGH */ 390 #endif 391 case TELOPT_ECHO: 392 settimer(modenegotiated); 393 break; 394 395 case TELOPT_TM: 396 if (flushout) 397 flushout = 0; 398 set_my_want_state_dont(option); 399 set_my_state_dont(option); 400 return; /* Never reply to TM will's/wont's */ 401 402 default: 403 break; 404 } 405 set_my_want_state_dont(option); 406 if (my_state_is_do(option)) 407 send_dont(option, 0); 408 setconnmode(0); /* Set new tty mode */ 409 } else if (option == TELOPT_TM) { 410 /* 411 * Special case for TM. 412 */ 413 if (flushout) 414 flushout = 0; 415 set_my_want_state_dont(option); 416 } 417 set_my_state_dont(option); 418 } 419 420 static void 421 dooption(int option) 422 { 423 int new_state_ok = 0; 424 425 if (will_wont_resp[option]) { 426 --will_wont_resp[option]; 427 if (will_wont_resp[option] && my_state_is_will(option)) 428 --will_wont_resp[option]; 429 } 430 431 if (will_wont_resp[option] == 0) { 432 if (my_want_state_is_wont(option)) { 433 434 switch (option) { 435 436 case TELOPT_TM: 437 /* 438 * Special case for TM. We send a WILL, but pretend 439 * we sent WONT. 440 */ 441 send_will(option, 0); 442 set_my_want_state_wont(TELOPT_TM); 443 set_my_state_wont(TELOPT_TM); 444 return; 445 446 case TELOPT_BINARY: /* binary mode */ 447 case TELOPT_NAWS: /* window size */ 448 case TELOPT_TSPEED: /* terminal speed */ 449 case TELOPT_LFLOW: /* local flow control */ 450 case TELOPT_TTYPE: /* terminal type option */ 451 case TELOPT_SGA: /* no big deal */ 452 #ifdef ENCRYPTION 453 case TELOPT_ENCRYPT: /* encryption variable option */ 454 #endif /* ENCRYPTION */ 455 new_state_ok = 1; 456 break; 457 458 case TELOPT_NEW_ENVIRON: /* New environment variable option */ 459 #ifdef OLD_ENVIRON 460 if (my_state_is_will(TELOPT_OLD_ENVIRON)) 461 send_wont(TELOPT_OLD_ENVIRON, 1); /* turn off the old */ 462 goto env_common; 463 case TELOPT_OLD_ENVIRON: /* Old environment variable option */ 464 if (my_state_is_will(TELOPT_NEW_ENVIRON)) 465 break; /* Don't enable if new one is in use! */ 466 env_common: 467 telopt_environ = option; 468 #endif 469 new_state_ok = 1; 470 break; 471 472 #ifdef AUTHENTICATION 473 case TELOPT_AUTHENTICATION: 474 if (autologin) 475 new_state_ok = 1; 476 break; 477 #endif 478 479 case TELOPT_XDISPLOC: /* X Display location */ 480 if (env_getvalue("DISPLAY")) 481 new_state_ok = 1; 482 break; 483 484 case TELOPT_LINEMODE: 485 #ifdef KLUDGELINEMODE 486 kludgelinemode = 0; 487 send_do(TELOPT_SGA, 1); 488 #endif 489 set_my_want_state_will(TELOPT_LINEMODE); 490 send_will(option, 0); 491 set_my_state_will(TELOPT_LINEMODE); 492 slc_init(); 493 return; 494 495 case TELOPT_ECHO: /* We're never going to echo... */ 496 default: 497 break; 498 } 499 500 if (new_state_ok) { 501 set_my_want_state_will(option); 502 send_will(option, 0); 503 setconnmode(0); /* Set new tty mode */ 504 } else { 505 will_wont_resp[option]++; 506 send_wont(option, 0); 507 } 508 } else { 509 /* 510 * Handle options that need more things done after the 511 * other side has acknowledged the option. 512 */ 513 switch (option) { 514 case TELOPT_LINEMODE: 515 #ifdef KLUDGELINEMODE 516 kludgelinemode = 0; 517 send_do(TELOPT_SGA, 1); 518 #endif 519 set_my_state_will(option); 520 slc_init(); 521 send_do(TELOPT_SGA, 0); 522 return; 523 } 524 } 525 } 526 set_my_state_will(option); 527 } 528 529 static void 530 dontoption(int option) 531 { 532 533 if (will_wont_resp[option]) { 534 --will_wont_resp[option]; 535 if (will_wont_resp[option] && my_state_is_wont(option)) 536 --will_wont_resp[option]; 537 } 538 539 if ((will_wont_resp[option] == 0) && my_want_state_is_will(option)) { 540 switch (option) { 541 case TELOPT_LINEMODE: 542 linemode = 0; /* put us back to the default state */ 543 break; 544 #ifdef OLD_ENVIRON 545 case TELOPT_NEW_ENVIRON: 546 /* 547 * The new environ option wasn't recognized, try 548 * the old one. 549 */ 550 send_will(TELOPT_OLD_ENVIRON, 1); 551 telopt_environ = TELOPT_OLD_ENVIRON; 552 break; 553 #endif 554 } 555 /* we always accept a DONT */ 556 set_my_want_state_wont(option); 557 if (my_state_is_will(option)) 558 send_wont(option, 0); 559 setconnmode(0); /* Set new tty mode */ 560 } 561 set_my_state_wont(option); 562 } 563 564 /* 565 * Given a buffer returned by tgetent(), this routine will turn 566 * the pipe separated list of names in the buffer into an array 567 * of pointers to null terminated names. We toss out any bad, 568 * duplicate, or verbose names (names with spaces). 569 */ 570 571 static const char *name_unknown = "UNKNOWN"; 572 static const char *unknown[] = { NULL, NULL }; 573 574 static const char ** 575 mklist(char *buf, char *name) 576 { 577 int n; 578 char c, *cp, **argvp, *cp2, **argv, **avt; 579 580 if (name) { 581 if (strlen(name) > 40) { 582 name = 0; 583 unknown[0] = name_unknown; 584 } else { 585 unknown[0] = name; 586 upcase(name); 587 } 588 } else 589 unknown[0] = name_unknown; 590 /* 591 * Count up the number of names. 592 */ 593 for (n = 1, cp = buf; *cp && *cp != ':'; cp++) { 594 if (*cp == '|') 595 n++; 596 } 597 /* 598 * Allocate an array to put the name pointers into 599 */ 600 argv = (char **)malloc((n+3)*sizeof(char *)); 601 if (argv == 0) 602 return(unknown); 603 604 /* 605 * Fill up the array of pointers to names. 606 */ 607 *argv = 0; 608 argvp = argv+1; 609 n = 0; 610 for (cp = cp2 = buf; (c = *cp); cp++) { 611 if (c == '|' || c == ':') { 612 *cp++ = '\0'; 613 /* 614 * Skip entries that have spaces or are over 40 615 * characters long. If this is our environment 616 * name, then put it up front. Otherwise, as 617 * long as this is not a duplicate name (case 618 * insensitive) add it to the list. 619 */ 620 if (n || (cp - cp2 > 41)) 621 ; 622 else if (name && (strncasecmp(name, cp2, cp-cp2) == 0)) 623 *argv = cp2; 624 else if (is_unique(cp2, argv+1, argvp)) 625 *argvp++ = cp2; 626 if (c == ':') 627 break; 628 /* 629 * Skip multiple delimiters. Reset cp2 to 630 * the beginning of the next name. Reset n, 631 * the flag for names with spaces. 632 */ 633 while ((c = *cp) == '|') 634 cp++; 635 cp2 = cp; 636 n = 0; 637 } 638 /* 639 * Skip entries with spaces or non-ascii values. 640 * Convert lower case letters to upper case. 641 */ 642 if ((c == ' ') || !isascii(c)) 643 n = 1; 644 else if (islower(c)) 645 *cp = toupper(c); 646 } 647 648 /* 649 * Check for an old V6 2 character name. If the second 650 * name points to the beginning of the buffer, and is 651 * only 2 characters long, move it to the end of the array. 652 */ 653 if ((argv[1] == buf) && (strlen(argv[1]) == 2)) { 654 --argvp; 655 for (avt = &argv[1]; avt < argvp; avt++) 656 *avt = *(avt+1); 657 *argvp++ = buf; 658 } 659 660 /* 661 * Duplicate last name, for TTYPE option, and null 662 * terminate the array. If we didn't find a match on 663 * our terminal name, put that name at the beginning. 664 */ 665 cp = *(argvp-1); 666 *argvp++ = cp; 667 *argvp = 0; 668 669 if (*argv == 0) { 670 if (name) 671 *argv = name; 672 else { 673 --argvp; 674 for (avt = argv; avt < argvp; avt++) 675 *avt = *(avt+1); 676 } 677 } 678 if (*argv) 679 return((const char **)argv); 680 else 681 return(unknown); 682 } 683 684 static int 685 is_unique(char *name, char **as, char **ae) 686 { 687 char **ap; 688 int n; 689 690 n = strlen(name) + 1; 691 for (ap = as; ap < ae; ap++) 692 if (strncasecmp(*ap, name, n) == 0) 693 return(0); 694 return (1); 695 } 696 697 #ifdef TERMCAP 698 char termbuf[1024]; 699 700 /*ARGSUSED*/ 701 static int 702 setupterm(char *tname, int fd, int *errp) 703 { 704 if (tgetent(termbuf, tname) == 1) { 705 termbuf[1023] = '\0'; 706 if (errp) 707 *errp = 1; 708 return(0); 709 } 710 if (errp) 711 *errp = 0; 712 return(-1); 713 } 714 #else 715 #define termbuf ttytype 716 extern char ttytype[]; 717 #endif 718 719 int resettermname = 1; 720 721 static const char * 722 gettermname(void) 723 { 724 char *tname; 725 static const char **tnamep = 0; 726 static const char **next; 727 int err; 728 729 if (resettermname) { 730 resettermname = 0; 731 if (tnamep && tnamep != unknown) 732 free(tnamep); 733 if ((tname = env_getvalue("TERM")) && 734 (setupterm(tname, 1, &err) == 0)) { 735 tnamep = mklist(termbuf, tname); 736 } else { 737 if (tname && (strlen(tname) <= 40)) { 738 unknown[0] = tname; 739 upcase(tname); 740 } else 741 unknown[0] = name_unknown; 742 tnamep = unknown; 743 } 744 next = tnamep; 745 } 746 if (*next == 0) 747 next = tnamep; 748 return(*next++); 749 } 750 /* 751 * suboption() 752 * 753 * Look at the sub-option buffer, and try to be helpful to the other 754 * side. 755 * 756 * Currently we recognize: 757 * 758 * Terminal type, send request. 759 * Terminal speed (send request). 760 * Local flow control (is request). 761 * Linemode 762 */ 763 764 static void 765 suboption(void) 766 { 767 unsigned char subchar; 768 769 printsub('<', subbuffer, SB_LEN()+2); 770 switch (subchar = SB_GET()) { 771 case TELOPT_TTYPE: 772 if (my_want_state_is_wont(TELOPT_TTYPE)) 773 return; 774 if (SB_EOF() || SB_GET() != TELQUAL_SEND) { 775 return; 776 } else { 777 const char *name; 778 unsigned char temp[50]; 779 int len; 780 781 name = gettermname(); 782 len = strlen(name) + 4 + 2; 783 if (len < NETROOM()) { 784 snprintf(temp, sizeof(temp), "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE, 785 TELQUAL_IS, name, IAC, SE); 786 ring_supply_data(&netoring, temp, len); 787 printsub('>', &temp[2], len-2); 788 } else { 789 ExitString("No room in buffer for terminal type.\n", 1); 790 /*NOTREACHED*/ 791 } 792 } 793 break; 794 case TELOPT_TSPEED: 795 if (my_want_state_is_wont(TELOPT_TSPEED)) 796 return; 797 if (SB_EOF()) 798 return; 799 if (SB_GET() == TELQUAL_SEND) { 800 long ospeed, ispeed; 801 unsigned char temp[50]; 802 int len; 803 804 TerminalSpeeds(&ispeed, &ospeed); 805 806 snprintf((char *)temp, sizeof(temp), "%c%c%c%c%ld,%ld%c%c", IAC, SB, TELOPT_TSPEED, 807 TELQUAL_IS, ospeed, ispeed, IAC, SE); 808 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 809 810 if (len < NETROOM()) { 811 ring_supply_data(&netoring, temp, len); 812 printsub('>', temp+2, len - 2); 813 } 814 /*@*/ else printf("lm_will: not enough room in buffer\n"); 815 } 816 break; 817 case TELOPT_LFLOW: 818 if (my_want_state_is_wont(TELOPT_LFLOW)) 819 return; 820 if (SB_EOF()) 821 return; 822 switch(SB_GET()) { 823 case LFLOW_RESTART_ANY: 824 restartany = 1; 825 break; 826 case LFLOW_RESTART_XON: 827 restartany = 0; 828 break; 829 case LFLOW_ON: 830 localflow = 1; 831 break; 832 case LFLOW_OFF: 833 localflow = 0; 834 break; 835 default: 836 return; 837 } 838 setcommandmode(); 839 setconnmode(0); 840 break; 841 842 case TELOPT_LINEMODE: 843 if (my_want_state_is_wont(TELOPT_LINEMODE)) 844 return; 845 if (SB_EOF()) 846 return; 847 switch (SB_GET()) { 848 case WILL: 849 lm_will(subpointer, SB_LEN()); 850 break; 851 case WONT: 852 lm_wont(subpointer, SB_LEN()); 853 break; 854 case DO: 855 lm_do(subpointer, SB_LEN()); 856 break; 857 case DONT: 858 lm_dont(subpointer, SB_LEN()); 859 break; 860 case LM_SLC: 861 slc(subpointer, SB_LEN()); 862 break; 863 case LM_MODE: 864 lm_mode(subpointer, SB_LEN(), 0); 865 break; 866 default: 867 break; 868 } 869 break; 870 871 #ifdef OLD_ENVIRON 872 case TELOPT_OLD_ENVIRON: 873 #endif 874 case TELOPT_NEW_ENVIRON: 875 if (SB_EOF()) 876 return; 877 switch(SB_PEEK()) { 878 case TELQUAL_IS: 879 case TELQUAL_INFO: 880 if (my_want_state_is_dont(subchar)) 881 return; 882 break; 883 case TELQUAL_SEND: 884 if (my_want_state_is_wont(subchar)) { 885 return; 886 } 887 break; 888 default: 889 return; 890 } 891 env_opt(subpointer, SB_LEN()); 892 break; 893 894 case TELOPT_XDISPLOC: 895 if (my_want_state_is_wont(TELOPT_XDISPLOC)) 896 return; 897 if (SB_EOF()) 898 return; 899 if (SB_GET() == TELQUAL_SEND) { 900 unsigned char temp[50], *dp; 901 int len; 902 903 if ((dp = env_getvalue("DISPLAY")) == NULL || 904 strlen(dp) > sizeof(temp) - 7) { 905 /* 906 * Something happened, we no longer have a DISPLAY 907 * variable. Or it is too long. So, turn off the option. 908 */ 909 send_wont(TELOPT_XDISPLOC, 1); 910 break; 911 } 912 snprintf(temp, sizeof(temp), "%c%c%c%c%s%c%c", IAC, SB, 913 TELOPT_XDISPLOC, TELQUAL_IS, dp, IAC, SE); 914 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 915 916 if (len < NETROOM()) { 917 ring_supply_data(&netoring, temp, len); 918 printsub('>', temp+2, len - 2); 919 } 920 /*@*/ else printf("lm_will: not enough room in buffer\n"); 921 } 922 break; 923 924 #ifdef AUTHENTICATION 925 case TELOPT_AUTHENTICATION: { 926 if (!autologin) 927 break; 928 if (SB_EOF()) 929 return; 930 switch(SB_GET()) { 931 case TELQUAL_IS: 932 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 933 return; 934 auth_is(subpointer, SB_LEN()); 935 break; 936 case TELQUAL_SEND: 937 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 938 return; 939 auth_send(subpointer, SB_LEN()); 940 break; 941 case TELQUAL_REPLY: 942 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 943 return; 944 auth_reply(subpointer, SB_LEN()); 945 break; 946 case TELQUAL_NAME: 947 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 948 return; 949 auth_name(subpointer, SB_LEN()); 950 break; 951 } 952 } 953 break; 954 #endif 955 #ifdef ENCRYPTION 956 case TELOPT_ENCRYPT: 957 if (SB_EOF()) 958 return; 959 switch(SB_GET()) { 960 case ENCRYPT_START: 961 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 962 return; 963 encrypt_start(subpointer, SB_LEN()); 964 break; 965 case ENCRYPT_END: 966 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 967 return; 968 encrypt_end(); 969 break; 970 case ENCRYPT_SUPPORT: 971 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 972 return; 973 encrypt_support(subpointer, SB_LEN()); 974 break; 975 case ENCRYPT_REQSTART: 976 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 977 return; 978 encrypt_request_start(subpointer, SB_LEN()); 979 break; 980 case ENCRYPT_REQEND: 981 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 982 return; 983 /* 984 * We can always send an REQEND so that we cannot 985 * get stuck encrypting. We should only get this 986 * if we have been able to get in the correct mode 987 * anyhow. 988 */ 989 encrypt_request_end(); 990 break; 991 case ENCRYPT_IS: 992 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 993 return; 994 encrypt_is(subpointer, SB_LEN()); 995 break; 996 case ENCRYPT_REPLY: 997 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 998 return; 999 encrypt_reply(subpointer, SB_LEN()); 1000 break; 1001 case ENCRYPT_ENC_KEYID: 1002 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 1003 return; 1004 encrypt_enc_keyid(subpointer, SB_LEN()); 1005 break; 1006 case ENCRYPT_DEC_KEYID: 1007 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1008 return; 1009 encrypt_dec_keyid(subpointer, SB_LEN()); 1010 break; 1011 default: 1012 break; 1013 } 1014 break; 1015 #endif /* ENCRYPTION */ 1016 default: 1017 break; 1018 } 1019 } 1020 1021 static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE }; 1022 1023 void 1024 lm_will(unsigned char *cmd, int len) 1025 { 1026 if (len < 1) { 1027 /*@*/ printf("lm_will: no command!!!\n"); /* Should not happen... */ 1028 return; 1029 } 1030 switch(cmd[0]) { 1031 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 1032 default: 1033 str_lm[3] = DONT; 1034 str_lm[4] = cmd[0]; 1035 if (NETROOM() > (int)sizeof(str_lm)) { 1036 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 1037 printsub('>', &str_lm[2], sizeof(str_lm)-2); 1038 } 1039 /*@*/ else printf("lm_will: not enough room in buffer\n"); 1040 break; 1041 } 1042 } 1043 1044 void 1045 lm_wont(unsigned char *cmd, int len) 1046 { 1047 if (len < 1) { 1048 /*@*/ printf("lm_wont: no command!!!\n"); /* Should not happen... */ 1049 return; 1050 } 1051 switch(cmd[0]) { 1052 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 1053 default: 1054 /* We are always DONT, so don't respond */ 1055 return; 1056 } 1057 } 1058 1059 void 1060 lm_do(unsigned char *cmd, int len) 1061 { 1062 if (len < 1) { 1063 /*@*/ printf("lm_do: no command!!!\n"); /* Should not happen... */ 1064 return; 1065 } 1066 switch(cmd[0]) { 1067 case LM_FORWARDMASK: 1068 default: 1069 str_lm[3] = WONT; 1070 str_lm[4] = cmd[0]; 1071 if (NETROOM() > (int)sizeof(str_lm)) { 1072 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 1073 printsub('>', &str_lm[2], sizeof(str_lm)-2); 1074 } 1075 /*@*/ else printf("lm_do: not enough room in buffer\n"); 1076 break; 1077 } 1078 } 1079 1080 void 1081 lm_dont(unsigned char *cmd, int len) 1082 { 1083 if (len < 1) { 1084 /*@*/ printf("lm_dont: no command!!!\n"); /* Should not happen... */ 1085 return; 1086 } 1087 switch(cmd[0]) { 1088 case LM_FORWARDMASK: 1089 default: 1090 /* we are always WONT, so don't respond */ 1091 break; 1092 } 1093 } 1094 1095 static unsigned char str_lm_mode[] = { 1096 IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE 1097 }; 1098 1099 void 1100 lm_mode(unsigned char *cmd, int len, int init) 1101 { 1102 if (len != 1) 1103 return; 1104 if ((linemode&MODE_MASK&~MODE_ACK) == *cmd) 1105 return; 1106 if (*cmd&MODE_ACK) 1107 return; 1108 linemode = *cmd&(MODE_MASK&~MODE_ACK); 1109 str_lm_mode[4] = linemode; 1110 if (!init) 1111 str_lm_mode[4] |= MODE_ACK; 1112 if (NETROOM() > (int)sizeof(str_lm_mode)) { 1113 ring_supply_data(&netoring, str_lm_mode, sizeof(str_lm_mode)); 1114 printsub('>', &str_lm_mode[2], sizeof(str_lm_mode)-2); 1115 } 1116 /*@*/ else printf("lm_mode: not enough room in buffer\n"); 1117 setconnmode(0); /* set changed mode */ 1118 } 1119 1120 1121 1122 /* 1123 * slc() 1124 * Handle special character suboption of LINEMODE. 1125 */ 1126 1127 struct spc { 1128 cc_t val; 1129 cc_t *valp; 1130 char flags; /* Current flags & level */ 1131 char mylevel; /* Maximum level & flags */ 1132 } spc_data[NSLC+1]; 1133 1134 #define SLC_IMPORT 0 1135 #define SLC_EXPORT 1 1136 #define SLC_RVALUE 2 1137 static int slc_mode = SLC_EXPORT; 1138 1139 void 1140 slc_init(void) 1141 { 1142 struct spc *spcp; 1143 1144 localchars = 1; 1145 for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) { 1146 spcp->val = 0; 1147 spcp->valp = 0; 1148 spcp->flags = spcp->mylevel = SLC_NOSUPPORT; 1149 } 1150 1151 #define initfunc(func, flags) { \ 1152 spcp = &spc_data[func]; \ 1153 if ((spcp->valp = tcval(func))) { \ 1154 spcp->val = *spcp->valp; \ 1155 spcp->mylevel = SLC_VARIABLE|flags; \ 1156 } else { \ 1157 spcp->val = 0; \ 1158 spcp->mylevel = SLC_DEFAULT; \ 1159 } \ 1160 } 1161 1162 initfunc(SLC_SYNCH, 0); 1163 /* No BRK */ 1164 initfunc(SLC_AO, 0); 1165 initfunc(SLC_AYT, 0); 1166 /* No EOR */ 1167 initfunc(SLC_ABORT, SLC_FLUSHIN|SLC_FLUSHOUT); 1168 initfunc(SLC_EOF, 0); 1169 #ifndef SYSV_TERMIO 1170 initfunc(SLC_SUSP, SLC_FLUSHIN); 1171 #endif 1172 initfunc(SLC_EC, 0); 1173 initfunc(SLC_EL, 0); 1174 #ifndef SYSV_TERMIO 1175 initfunc(SLC_EW, 0); 1176 initfunc(SLC_RP, 0); 1177 initfunc(SLC_LNEXT, 0); 1178 #endif 1179 initfunc(SLC_XON, 0); 1180 initfunc(SLC_XOFF, 0); 1181 #ifdef SYSV_TERMIO 1182 spc_data[SLC_XON].mylevel = SLC_CANTCHANGE; 1183 spc_data[SLC_XOFF].mylevel = SLC_CANTCHANGE; 1184 #endif 1185 initfunc(SLC_FORW1, 0); 1186 #ifdef USE_TERMIO 1187 initfunc(SLC_FORW2, 0); 1188 /* No FORW2 */ 1189 #endif 1190 1191 initfunc(SLC_IP, SLC_FLUSHIN|SLC_FLUSHOUT); 1192 #undef initfunc 1193 1194 if (slc_mode == SLC_EXPORT) 1195 slc_export(); 1196 else 1197 slc_import(1); 1198 1199 } 1200 1201 void 1202 slcstate(void) 1203 { 1204 printf("Special characters are %s values\n", 1205 slc_mode == SLC_IMPORT ? "remote default" : 1206 slc_mode == SLC_EXPORT ? "local" : 1207 "remote"); 1208 } 1209 1210 void 1211 slc_mode_export(void) 1212 { 1213 slc_mode = SLC_EXPORT; 1214 if (my_state_is_will(TELOPT_LINEMODE)) 1215 slc_export(); 1216 } 1217 1218 void 1219 slc_mode_import(int def) 1220 { 1221 slc_mode = def ? SLC_IMPORT : SLC_RVALUE; 1222 if (my_state_is_will(TELOPT_LINEMODE)) 1223 slc_import(def); 1224 } 1225 1226 unsigned char slc_import_val[] = { 1227 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE 1228 }; 1229 unsigned char slc_import_def[] = { 1230 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE 1231 }; 1232 1233 void 1234 slc_import(int def) 1235 { 1236 if (NETROOM() > (int)sizeof(slc_import_val)) { 1237 if (def) { 1238 ring_supply_data(&netoring, slc_import_def, sizeof(slc_import_def)); 1239 printsub('>', &slc_import_def[2], sizeof(slc_import_def)-2); 1240 } else { 1241 ring_supply_data(&netoring, slc_import_val, sizeof(slc_import_val)); 1242 printsub('>', &slc_import_val[2], sizeof(slc_import_val)-2); 1243 } 1244 } 1245 /*@*/ else printf("slc_import: not enough room\n"); 1246 } 1247 1248 void 1249 slc_export(void) 1250 { 1251 struct spc *spcp; 1252 1253 TerminalDefaultChars(); 1254 1255 slc_start_reply(); 1256 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1257 if (spcp->mylevel != SLC_NOSUPPORT) { 1258 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1259 spcp->flags = SLC_NOSUPPORT; 1260 else 1261 spcp->flags = spcp->mylevel; 1262 if (spcp->valp) 1263 spcp->val = *spcp->valp; 1264 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1265 } 1266 } 1267 slc_end_reply(); 1268 (void)slc_update(); 1269 setconnmode(1); /* Make sure the character values are set */ 1270 } 1271 1272 void 1273 slc(unsigned char *cp, int len) 1274 { 1275 struct spc *spcp; 1276 int func,level; 1277 1278 slc_start_reply(); 1279 1280 for (; len >= 3; len -=3, cp +=3) { 1281 1282 func = cp[SLC_FUNC]; 1283 1284 if (func == 0) { 1285 /* 1286 * Client side: always ignore 0 function. 1287 */ 1288 continue; 1289 } 1290 if (func > NSLC) { 1291 if ((cp[SLC_FLAGS] & SLC_LEVELBITS) != SLC_NOSUPPORT) 1292 slc_add_reply(func, SLC_NOSUPPORT, 0); 1293 continue; 1294 } 1295 1296 spcp = &spc_data[func]; 1297 1298 level = cp[SLC_FLAGS]&(SLC_LEVELBITS|SLC_ACK); 1299 1300 if ((cp[SLC_VALUE] == (unsigned char)spcp->val) && 1301 ((level&SLC_LEVELBITS) == (spcp->flags&SLC_LEVELBITS))) { 1302 continue; 1303 } 1304 1305 if (level == (SLC_DEFAULT|SLC_ACK)) { 1306 /* 1307 * This is an error condition, the SLC_ACK 1308 * bit should never be set for the SLC_DEFAULT 1309 * level. Our best guess to recover is to 1310 * ignore the SLC_ACK bit. 1311 */ 1312 cp[SLC_FLAGS] &= ~SLC_ACK; 1313 } 1314 1315 if (level == ((spcp->flags&SLC_LEVELBITS)|SLC_ACK)) { 1316 spcp->val = (cc_t)cp[SLC_VALUE]; 1317 spcp->flags = cp[SLC_FLAGS]; /* include SLC_ACK */ 1318 continue; 1319 } 1320 1321 level &= ~SLC_ACK; 1322 1323 if (level <= (spcp->mylevel&SLC_LEVELBITS)) { 1324 spcp->flags = cp[SLC_FLAGS]|SLC_ACK; 1325 spcp->val = (cc_t)cp[SLC_VALUE]; 1326 } 1327 if (level == SLC_DEFAULT) { 1328 if ((spcp->mylevel&SLC_LEVELBITS) != SLC_DEFAULT) 1329 spcp->flags = spcp->mylevel; 1330 else 1331 spcp->flags = SLC_NOSUPPORT; 1332 } 1333 slc_add_reply(func, spcp->flags, spcp->val); 1334 } 1335 slc_end_reply(); 1336 if (slc_update()) 1337 setconnmode(1); /* set the new character values */ 1338 } 1339 1340 void 1341 slc_check(void) 1342 { 1343 struct spc *spcp; 1344 1345 slc_start_reply(); 1346 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1347 if (spcp->valp && spcp->val != *spcp->valp) { 1348 spcp->val = *spcp->valp; 1349 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1350 spcp->flags = SLC_NOSUPPORT; 1351 else 1352 spcp->flags = spcp->mylevel; 1353 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1354 } 1355 } 1356 slc_end_reply(); 1357 setconnmode(1); 1358 } 1359 1360 unsigned char slc_reply[128]; 1361 unsigned char const * const slc_reply_eom = &slc_reply[sizeof(slc_reply)]; 1362 unsigned char *slc_replyp; 1363 1364 void 1365 slc_start_reply(void) 1366 { 1367 slc_replyp = slc_reply; 1368 *slc_replyp++ = IAC; 1369 *slc_replyp++ = SB; 1370 *slc_replyp++ = TELOPT_LINEMODE; 1371 *slc_replyp++ = LM_SLC; 1372 } 1373 1374 void 1375 slc_add_reply(unsigned char func, unsigned char flags, cc_t value) 1376 { 1377 /* A sequence of up to 6 bytes my be written for this member of the SLC 1378 * suboption list by this function. The end of negotiation command, 1379 * which is written by slc_end_reply(), will require 2 additional 1380 * bytes. Do not proceed unless there is sufficient space for these 1381 * items. 1382 */ 1383 if (&slc_replyp[6+2] > slc_reply_eom) 1384 return; 1385 if ((*slc_replyp++ = func) == IAC) 1386 *slc_replyp++ = IAC; 1387 if ((*slc_replyp++ = flags) == IAC) 1388 *slc_replyp++ = IAC; 1389 if ((*slc_replyp++ = (unsigned char)value) == IAC) 1390 *slc_replyp++ = IAC; 1391 } 1392 1393 void 1394 slc_end_reply(void) 1395 { 1396 int len; 1397 1398 /* The end of negotiation command requires 2 bytes. */ 1399 if (&slc_replyp[2] > slc_reply_eom) 1400 return; 1401 *slc_replyp++ = IAC; 1402 *slc_replyp++ = SE; 1403 len = slc_replyp - slc_reply; 1404 if (len <= 6) 1405 return; 1406 if (NETROOM() > len) { 1407 ring_supply_data(&netoring, slc_reply, slc_replyp - slc_reply); 1408 printsub('>', &slc_reply[2], slc_replyp - slc_reply - 2); 1409 } 1410 /*@*/else printf("slc_end_reply: not enough room\n"); 1411 } 1412 1413 int 1414 slc_update(void) 1415 { 1416 struct spc *spcp; 1417 int need_update = 0; 1418 1419 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1420 if (!(spcp->flags&SLC_ACK)) 1421 continue; 1422 spcp->flags &= ~SLC_ACK; 1423 if (spcp->valp && (*spcp->valp != spcp->val)) { 1424 *spcp->valp = spcp->val; 1425 need_update = 1; 1426 } 1427 } 1428 return(need_update); 1429 } 1430 1431 #ifdef OLD_ENVIRON 1432 # ifdef ENV_HACK 1433 /* 1434 * Earlier version of telnet/telnetd from the BSD code had 1435 * the definitions of VALUE and VAR reversed. To ensure 1436 * maximum interoperability, we assume that the server is 1437 * an older BSD server, until proven otherwise. The newer 1438 * BSD servers should be able to handle either definition, 1439 * so it is better to use the wrong values if we don't 1440 * know what type of server it is. 1441 */ 1442 int env_auto = 1; 1443 int old_env_var = OLD_ENV_VAR; 1444 int old_env_value = OLD_ENV_VALUE; 1445 # else 1446 # define old_env_var OLD_ENV_VAR 1447 # define old_env_value OLD_ENV_VALUE 1448 # endif 1449 #endif 1450 1451 void 1452 env_opt(unsigned char *buf, int len) 1453 { 1454 unsigned char *ep = 0, *epc = 0; 1455 int i; 1456 1457 switch(buf[0]&0xff) { 1458 case TELQUAL_SEND: 1459 env_opt_start(); 1460 if (len == 1) { 1461 env_opt_add(NULL); 1462 } else for (i = 1; i < len; i++) { 1463 switch (buf[i]&0xff) { 1464 #ifdef OLD_ENVIRON 1465 case OLD_ENV_VAR: 1466 # ifdef ENV_HACK 1467 if (telopt_environ == TELOPT_OLD_ENVIRON 1468 && env_auto) { 1469 /* Server has the same definitions */ 1470 old_env_var = OLD_ENV_VAR; 1471 old_env_value = OLD_ENV_VALUE; 1472 } 1473 /* FALLTHROUGH */ 1474 # endif 1475 case OLD_ENV_VALUE: 1476 /* 1477 * Although OLD_ENV_VALUE is not legal, we will 1478 * still recognize it, just in case it is an 1479 * old server that has VAR & VALUE mixed up... 1480 */ 1481 /* FALLTHROUGH */ 1482 #else 1483 case NEW_ENV_VAR: 1484 #endif 1485 case ENV_USERVAR: 1486 if (ep) { 1487 *epc = 0; 1488 env_opt_add(ep); 1489 } 1490 ep = epc = &buf[i+1]; 1491 break; 1492 case ENV_ESC: 1493 i++; 1494 /*FALLTHROUGH*/ 1495 default: 1496 if (epc) 1497 *epc++ = buf[i]; 1498 break; 1499 } 1500 } 1501 if (ep) { 1502 *epc = 0; 1503 env_opt_add(ep); 1504 } 1505 env_opt_end(1); 1506 break; 1507 1508 case TELQUAL_IS: 1509 case TELQUAL_INFO: 1510 /* Ignore for now. We shouldn't get it anyway. */ 1511 break; 1512 1513 default: 1514 break; 1515 } 1516 } 1517 1518 #define OPT_REPLY_SIZE (2 * SUBBUFSIZE) 1519 unsigned char *opt_reply = NULL; 1520 unsigned char *opt_replyp; 1521 unsigned char *opt_replyend; 1522 1523 void 1524 env_opt_start(void) 1525 { 1526 if (opt_reply) 1527 opt_reply = (unsigned char *)realloc(opt_reply, OPT_REPLY_SIZE); 1528 else 1529 opt_reply = (unsigned char *)malloc(OPT_REPLY_SIZE); 1530 if (opt_reply == NULL) { 1531 /*@*/ printf("env_opt_start: malloc()/realloc() failed!!!\n"); 1532 opt_reply = opt_replyp = opt_replyend = NULL; 1533 return; 1534 } 1535 opt_replyp = opt_reply; 1536 opt_replyend = opt_reply + OPT_REPLY_SIZE; 1537 *opt_replyp++ = IAC; 1538 *opt_replyp++ = SB; 1539 *opt_replyp++ = telopt_environ; 1540 *opt_replyp++ = TELQUAL_IS; 1541 } 1542 1543 void 1544 env_opt_start_info(void) 1545 { 1546 env_opt_start(); 1547 if (opt_replyp) 1548 opt_replyp[-1] = TELQUAL_INFO; 1549 } 1550 1551 void 1552 env_opt_add(unsigned char *ep) 1553 { 1554 unsigned char *vp, c; 1555 1556 if (opt_reply == NULL) /*XXX*/ 1557 return; /*XXX*/ 1558 1559 if (ep == NULL || *ep == '\0') { 1560 /* Send user defined variables first. */ 1561 env_default(1, 0); 1562 while ((ep = env_default(0, 0))) 1563 env_opt_add(ep); 1564 1565 /* Now add the list of well know variables. */ 1566 env_default(1, 1); 1567 while ((ep = env_default(0, 1))) 1568 env_opt_add(ep); 1569 return; 1570 } 1571 vp = env_getvalue(ep); 1572 if (opt_replyp + (vp ? 2 * strlen((char *)vp) : 0) + 1573 2 * strlen((char *)ep) + 6 > opt_replyend) 1574 { 1575 int len; 1576 opt_replyend += OPT_REPLY_SIZE; 1577 len = opt_replyend - opt_reply; 1578 opt_reply = (unsigned char *)realloc(opt_reply, len); 1579 if (opt_reply == NULL) { 1580 /*@*/ printf("env_opt_add: realloc() failed!!!\n"); 1581 opt_reply = opt_replyp = opt_replyend = NULL; 1582 return; 1583 } 1584 opt_replyp = opt_reply + len - (opt_replyend - opt_replyp); 1585 opt_replyend = opt_reply + len; 1586 } 1587 if (opt_welldefined(ep)) 1588 #ifdef OLD_ENVIRON 1589 if (telopt_environ == TELOPT_OLD_ENVIRON) 1590 *opt_replyp++ = old_env_var; 1591 else 1592 #endif 1593 *opt_replyp++ = NEW_ENV_VAR; 1594 else 1595 *opt_replyp++ = ENV_USERVAR; 1596 for (;;) { 1597 while ((c = *ep++)) { 1598 if (opt_replyp + (2 + 2) > opt_replyend) 1599 return; 1600 switch(c&0xff) { 1601 case IAC: 1602 *opt_replyp++ = IAC; 1603 break; 1604 case NEW_ENV_VAR: 1605 case NEW_ENV_VALUE: 1606 case ENV_ESC: 1607 case ENV_USERVAR: 1608 *opt_replyp++ = ENV_ESC; 1609 break; 1610 } 1611 *opt_replyp++ = c; 1612 } 1613 if ((ep = vp)) { 1614 if (opt_replyp + (1 + 2 + 2) > opt_replyend) 1615 return; 1616 #ifdef OLD_ENVIRON 1617 if (telopt_environ == TELOPT_OLD_ENVIRON) 1618 *opt_replyp++ = old_env_value; 1619 else 1620 #endif 1621 *opt_replyp++ = NEW_ENV_VALUE; 1622 vp = NULL; 1623 } else 1624 break; 1625 } 1626 } 1627 1628 int 1629 opt_welldefined(const char *ep) 1630 { 1631 if ((strcmp(ep, "USER") == 0) || 1632 (strcmp(ep, "DISPLAY") == 0) || 1633 (strcmp(ep, "PRINTER") == 0) || 1634 (strcmp(ep, "SYSTEMTYPE") == 0) || 1635 (strcmp(ep, "JOB") == 0) || 1636 (strcmp(ep, "ACCT") == 0)) 1637 return(1); 1638 return(0); 1639 } 1640 1641 void 1642 env_opt_end(int emptyok) 1643 { 1644 int len; 1645 1646 if (opt_replyp + 2 > opt_replyend) 1647 return; 1648 len = opt_replyp + 2 - opt_reply; 1649 if (emptyok || len > 6) { 1650 *opt_replyp++ = IAC; 1651 *opt_replyp++ = SE; 1652 if (NETROOM() > len) { 1653 ring_supply_data(&netoring, opt_reply, len); 1654 printsub('>', &opt_reply[2], len - 2); 1655 } 1656 /*@*/ else printf("slc_end_reply: not enough room\n"); 1657 } 1658 if (opt_reply) { 1659 free(opt_reply); 1660 opt_reply = opt_replyp = opt_replyend = NULL; 1661 } 1662 } 1663 1664 1665 1666 int 1667 telrcv(void) 1668 { 1669 int c; 1670 int scc; 1671 unsigned char *sbp; 1672 int count; 1673 int returnValue = 0; 1674 1675 scc = 0; 1676 count = 0; 1677 while (TTYROOM() > 2) { 1678 if (scc == 0) { 1679 if (count) { 1680 ring_consumed(&netiring, count); 1681 returnValue = 1; 1682 count = 0; 1683 } 1684 sbp = netiring.consume; 1685 scc = ring_full_consecutive(&netiring); 1686 if (scc == 0) { 1687 /* No more data coming in */ 1688 break; 1689 } 1690 } 1691 1692 c = *sbp++ & 0xff, scc--; count++; 1693 #ifdef ENCRYPTION 1694 if (decrypt_input) 1695 c = (*decrypt_input)(c); 1696 #endif /* ENCRYPTION */ 1697 1698 switch (telrcv_state) { 1699 1700 case TS_CR: 1701 telrcv_state = TS_DATA; 1702 if (c == '\0') { 1703 break; /* Ignore \0 after CR */ 1704 } 1705 else if ((c == '\n') && my_want_state_is_dont(TELOPT_ECHO) && !crmod) { 1706 TTYADD(c); 1707 break; 1708 } 1709 /* FALLTHROUGH */ 1710 1711 case TS_DATA: 1712 if (c == IAC && telnetport >= 0) { 1713 telrcv_state = TS_IAC; 1714 break; 1715 } 1716 /* 1717 * The 'crmod' hack (see following) is needed 1718 * since we can't * set CRMOD on output only. 1719 * Machines like MULTICS like to send \r without 1720 * \n; since we must turn off CRMOD to get proper 1721 * input, the mapping is done here (sigh). 1722 */ 1723 if ((c == '\r') && my_want_state_is_dont(TELOPT_BINARY)) { 1724 if (scc > 0) { 1725 c = *sbp&0xff; 1726 #ifdef ENCRYPTION 1727 if (decrypt_input) 1728 c = (*decrypt_input)(c); 1729 #endif /* ENCRYPTION */ 1730 if (c == 0) { 1731 sbp++, scc--; count++; 1732 /* a "true" CR */ 1733 TTYADD('\r'); 1734 } else if (my_want_state_is_dont(TELOPT_ECHO) && 1735 (c == '\n')) { 1736 sbp++, scc--; count++; 1737 TTYADD('\n'); 1738 } else { 1739 #ifdef ENCRYPTION 1740 if (decrypt_input) 1741 (*decrypt_input)(-1); 1742 #endif /* ENCRYPTION */ 1743 1744 TTYADD('\r'); 1745 if (crmod) { 1746 TTYADD('\n'); 1747 } 1748 } 1749 } else { 1750 telrcv_state = TS_CR; 1751 TTYADD('\r'); 1752 if (crmod) { 1753 TTYADD('\n'); 1754 } 1755 } 1756 } else { 1757 TTYADD(c); 1758 } 1759 continue; 1760 1761 case TS_IAC: 1762 process_iac: 1763 switch (c) { 1764 1765 case WILL: 1766 telrcv_state = TS_WILL; 1767 continue; 1768 1769 case WONT: 1770 telrcv_state = TS_WONT; 1771 continue; 1772 1773 case DO: 1774 telrcv_state = TS_DO; 1775 continue; 1776 1777 case DONT: 1778 telrcv_state = TS_DONT; 1779 continue; 1780 1781 case DM: 1782 /* 1783 * We may have missed an urgent notification, 1784 * so make sure we flush whatever is in the 1785 * buffer currently. 1786 */ 1787 printoption("RCVD", IAC, DM); 1788 SYNCHing = 1; 1789 (void) ttyflush(1); 1790 SYNCHing = stilloob(); 1791 settimer(gotDM); 1792 break; 1793 1794 case SB: 1795 SB_CLEAR(); 1796 telrcv_state = TS_SB; 1797 continue; 1798 1799 case IAC: 1800 TTYADD(IAC); 1801 break; 1802 1803 case NOP: 1804 case GA: 1805 default: 1806 printoption("RCVD", IAC, c); 1807 break; 1808 } 1809 telrcv_state = TS_DATA; 1810 continue; 1811 1812 case TS_WILL: 1813 printoption("RCVD", WILL, c); 1814 willoption(c); 1815 telrcv_state = TS_DATA; 1816 continue; 1817 1818 case TS_WONT: 1819 printoption("RCVD", WONT, c); 1820 wontoption(c); 1821 telrcv_state = TS_DATA; 1822 continue; 1823 1824 case TS_DO: 1825 printoption("RCVD", DO, c); 1826 dooption(c); 1827 if (c == TELOPT_NAWS) { 1828 sendnaws(); 1829 } else if (c == TELOPT_LFLOW) { 1830 localflow = 1; 1831 setcommandmode(); 1832 setconnmode(0); 1833 } 1834 telrcv_state = TS_DATA; 1835 continue; 1836 1837 case TS_DONT: 1838 printoption("RCVD", DONT, c); 1839 dontoption(c); 1840 flushline = 1; 1841 setconnmode(0); /* set new tty mode (maybe) */ 1842 telrcv_state = TS_DATA; 1843 continue; 1844 1845 case TS_SB: 1846 if (c == IAC) { 1847 telrcv_state = TS_SE; 1848 } else { 1849 SB_ACCUM(c); 1850 } 1851 continue; 1852 1853 case TS_SE: 1854 if (c != SE) { 1855 if (c != IAC) { 1856 /* 1857 * This is an error. We only expect to get 1858 * "IAC IAC" or "IAC SE". Several things may 1859 * have happend. An IAC was not doubled, the 1860 * IAC SE was left off, or another option got 1861 * inserted into the suboption are all possibilities. 1862 * If we assume that the IAC was not doubled, 1863 * and really the IAC SE was left off, we could 1864 * get into an infinate loop here. So, instead, 1865 * we terminate the suboption, and process the 1866 * partial suboption if we can. 1867 */ 1868 SB_ACCUM(IAC); 1869 SB_ACCUM(c); 1870 subpointer -= 2; 1871 SB_TERM(); 1872 1873 printoption("In SUBOPTION processing, RCVD", IAC, c); 1874 suboption(); /* handle sub-option */ 1875 telrcv_state = TS_IAC; 1876 goto process_iac; 1877 } 1878 SB_ACCUM(c); 1879 telrcv_state = TS_SB; 1880 } else { 1881 SB_ACCUM(IAC); 1882 SB_ACCUM(SE); 1883 subpointer -= 2; 1884 SB_TERM(); 1885 suboption(); /* handle sub-option */ 1886 telrcv_state = TS_DATA; 1887 } 1888 } 1889 } 1890 if (count) 1891 ring_consumed(&netiring, count); 1892 return returnValue||count; 1893 } 1894 1895 static int bol = 1, local = 0; 1896 1897 int 1898 rlogin_susp(void) 1899 { 1900 if (local) { 1901 local = 0; 1902 bol = 1; 1903 command(0, "z\n", 2); 1904 return(1); 1905 } 1906 return(0); 1907 } 1908 1909 static int 1910 telsnd(void) 1911 { 1912 int tcc; 1913 int count; 1914 int returnValue = 0; 1915 unsigned char *tbp; 1916 1917 tcc = 0; 1918 count = 0; 1919 while (NETROOM() > 2) { 1920 int sc; 1921 int c; 1922 1923 if (tcc == 0) { 1924 if (count) { 1925 ring_consumed(&ttyiring, count); 1926 returnValue = 1; 1927 count = 0; 1928 } 1929 tbp = ttyiring.consume; 1930 tcc = ring_full_consecutive(&ttyiring); 1931 if (tcc == 0) { 1932 break; 1933 } 1934 } 1935 c = *tbp++ & 0xff, sc = strip(c), tcc--; count++; 1936 if (rlogin != _POSIX_VDISABLE) { 1937 if (bol) { 1938 bol = 0; 1939 if (sc == rlogin) { 1940 local = 1; 1941 continue; 1942 } 1943 } else if (local) { 1944 local = 0; 1945 if (sc == '.' || c == termEofChar) { 1946 bol = 1; 1947 command(0, "close\n", 6); 1948 continue; 1949 } 1950 if (sc == termSuspChar) { 1951 bol = 1; 1952 command(0, "z\n", 2); 1953 continue; 1954 } 1955 if (sc == escape) { 1956 command(0, tbp, tcc); 1957 bol = 1; 1958 count += tcc; 1959 tcc = 0; 1960 flushline = 1; 1961 break; 1962 } 1963 if (sc != rlogin) { 1964 ++tcc; 1965 --tbp; 1966 --count; 1967 c = sc = rlogin; 1968 } 1969 } 1970 if ((sc == '\n') || (sc == '\r')) 1971 bol = 1; 1972 } else if (escape != _POSIX_VDISABLE && sc == escape) { 1973 /* 1974 * Double escape is a pass through of a single escape character. 1975 */ 1976 if (tcc && strip(*tbp) == escape) { 1977 tbp++; 1978 tcc--; 1979 count++; 1980 bol = 0; 1981 } else { 1982 command(0, (char *)tbp, tcc); 1983 bol = 1; 1984 count += tcc; 1985 tcc = 0; 1986 flushline = 1; 1987 break; 1988 } 1989 } else 1990 bol = 0; 1991 #ifdef KLUDGELINEMODE 1992 if (kludgelinemode && (globalmode&MODE_EDIT) && (sc == echoc)) { 1993 if (tcc > 0 && strip(*tbp) == echoc) { 1994 tcc--; tbp++; count++; 1995 } else { 1996 dontlecho = !dontlecho; 1997 settimer(echotoggle); 1998 setconnmode(0); 1999 flushline = 1; 2000 break; 2001 } 2002 } 2003 #endif 2004 if (MODE_LOCAL_CHARS(globalmode)) { 2005 if (TerminalSpecialChars(sc) == 0) { 2006 bol = 1; 2007 break; 2008 } 2009 } 2010 if (my_want_state_is_wont(TELOPT_BINARY)) { 2011 switch (c) { 2012 case '\n': 2013 /* 2014 * If we are in CRMOD mode (\r ==> \n) 2015 * on our local machine, then probably 2016 * a newline (unix) is CRLF (TELNET). 2017 */ 2018 if (MODE_LOCAL_CHARS(globalmode)) { 2019 NETADD('\r'); 2020 } 2021 NETADD('\n'); 2022 bol = flushline = 1; 2023 break; 2024 case '\r': 2025 if (!crlf) { 2026 NET2ADD('\r', '\0'); 2027 } else { 2028 NET2ADD('\r', '\n'); 2029 } 2030 bol = flushline = 1; 2031 break; 2032 case IAC: 2033 NET2ADD(IAC, IAC); 2034 break; 2035 default: 2036 NETADD(c); 2037 break; 2038 } 2039 } else if (c == IAC) { 2040 NET2ADD(IAC, IAC); 2041 } else { 2042 NETADD(c); 2043 } 2044 } 2045 if (count) 2046 ring_consumed(&ttyiring, count); 2047 return returnValue||count; /* Non-zero if we did anything */ 2048 } 2049 2050 /* 2051 * Scheduler() 2052 * 2053 * Try to do something. 2054 * 2055 * If we do something useful, return 1; else return 0. 2056 * 2057 */ 2058 2059 static int 2060 Scheduler(int block) 2061 { 2062 /* One wants to be a bit careful about setting returnValue 2063 * to one, since a one implies we did some useful work, 2064 * and therefore probably won't be called to block next 2065 */ 2066 int returnValue; 2067 int netin, netout, netex, ttyin, ttyout; 2068 2069 /* Decide which rings should be processed */ 2070 2071 netout = ring_full_count(&netoring) && 2072 (flushline || 2073 (my_want_state_is_wont(TELOPT_LINEMODE) 2074 #ifdef KLUDGELINEMODE 2075 && (!kludgelinemode || my_want_state_is_do(TELOPT_SGA)) 2076 #endif 2077 ) || 2078 my_want_state_is_will(TELOPT_BINARY)); 2079 ttyout = ring_full_count(&ttyoring); 2080 2081 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0); 2082 2083 netin = !ISend && ring_empty_count(&netiring); 2084 2085 netex = !SYNCHing; 2086 2087 /* Call to system code to process rings */ 2088 2089 returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block); 2090 2091 /* Now, look at the input rings, looking for work to do. */ 2092 2093 if (ring_full_count(&ttyiring)) { 2094 returnValue |= telsnd(); 2095 } 2096 2097 if (ring_full_count(&netiring)) { 2098 returnValue |= telrcv(); 2099 } 2100 return returnValue; 2101 } 2102 2103 #ifdef AUTHENTICATION 2104 #define __unusedhere 2105 #else 2106 #define __unusedhere __unused 2107 #endif 2108 /* 2109 * Select from tty and network... 2110 */ 2111 void 2112 telnet(char *user __unusedhere) 2113 { 2114 sys_telnet_init(); 2115 2116 #ifdef AUTHENTICATION 2117 #ifdef ENCRYPTION 2118 { 2119 static char local_host[256] = { 0 }; 2120 2121 if (!local_host[0]) { 2122 gethostname(local_host, sizeof(local_host)); 2123 local_host[sizeof(local_host)-1] = 0; 2124 } 2125 auth_encrypt_init(local_host, hostname, "TELNET", 0); 2126 auth_encrypt_user(user); 2127 } 2128 #endif 2129 #endif 2130 if (telnetport > 0) { 2131 #ifdef AUTHENTICATION 2132 if (autologin) 2133 send_will(TELOPT_AUTHENTICATION, 1); 2134 #endif 2135 #ifdef ENCRYPTION 2136 send_do(TELOPT_ENCRYPT, 1); 2137 send_will(TELOPT_ENCRYPT, 1); 2138 #endif /* ENCRYPTION */ 2139 send_do(TELOPT_SGA, 1); 2140 send_will(TELOPT_TTYPE, 1); 2141 send_will(TELOPT_NAWS, 1); 2142 send_will(TELOPT_TSPEED, 1); 2143 send_will(TELOPT_LFLOW, 1); 2144 send_will(TELOPT_LINEMODE, 1); 2145 send_will(TELOPT_NEW_ENVIRON, 1); 2146 send_do(TELOPT_STATUS, 1); 2147 if (env_getvalue("DISPLAY")) 2148 send_will(TELOPT_XDISPLOC, 1); 2149 if (eight) 2150 tel_enter_binary(eight); 2151 } 2152 2153 for (;;) { 2154 int schedValue; 2155 2156 while ((schedValue = Scheduler(0)) != 0) { 2157 if (schedValue == -1) { 2158 setcommandmode(); 2159 return; 2160 } 2161 } 2162 2163 if (Scheduler(1) == -1) { 2164 setcommandmode(); 2165 return; 2166 } 2167 } 2168 } 2169 2170 #if 0 /* XXX - this not being in is a bug */ 2171 /* 2172 * nextitem() 2173 * 2174 * Return the address of the next "item" in the TELNET data 2175 * stream. This will be the address of the next character if 2176 * the current address is a user data character, or it will 2177 * be the address of the character following the TELNET command 2178 * if the current address is a TELNET IAC ("I Am a Command") 2179 * character. 2180 */ 2181 2182 static char * 2183 nextitem(char *current) 2184 { 2185 if ((*current&0xff) != IAC) { 2186 return current+1; 2187 } 2188 switch (*(current+1)&0xff) { 2189 case DO: 2190 case DONT: 2191 case WILL: 2192 case WONT: 2193 return current+3; 2194 case SB: /* loop forever looking for the SE */ 2195 { 2196 char *look = current+2; 2197 2198 for (;;) { 2199 if ((*look++&0xff) == IAC) { 2200 if ((*look++&0xff) == SE) { 2201 return look; 2202 } 2203 } 2204 } 2205 } 2206 default: 2207 return current+2; 2208 } 2209 } 2210 #endif /* 0 */ 2211 2212 /* 2213 * netclear() 2214 * 2215 * We are about to do a TELNET SYNCH operation. Clear 2216 * the path to the network. 2217 * 2218 * Things are a bit tricky since we may have sent the first 2219 * byte or so of a previous TELNET command into the network. 2220 * So, we have to scan the network buffer from the beginning 2221 * until we are up to where we want to be. 2222 * 2223 * A side effect of what we do, just to keep things 2224 * simple, is to clear the urgent data pointer. The principal 2225 * caller should be setting the urgent data pointer AFTER calling 2226 * us in any case. 2227 */ 2228 2229 static void 2230 netclear(void) 2231 { 2232 /* Deleted */ 2233 } 2234 2235 /* 2236 * These routines add various telnet commands to the data stream. 2237 */ 2238 2239 static void 2240 doflush(void) 2241 { 2242 NET2ADD(IAC, DO); 2243 NETADD(TELOPT_TM); 2244 flushline = 1; 2245 flushout = 1; 2246 (void) ttyflush(1); /* Flush/drop output */ 2247 /* do printoption AFTER flush, otherwise the output gets tossed... */ 2248 printoption("SENT", DO, TELOPT_TM); 2249 } 2250 2251 void 2252 xmitAO(void) 2253 { 2254 NET2ADD(IAC, AO); 2255 printoption("SENT", IAC, AO); 2256 if (autoflush) { 2257 doflush(); 2258 } 2259 } 2260 2261 void 2262 xmitEL(void) 2263 { 2264 NET2ADD(IAC, EL); 2265 printoption("SENT", IAC, EL); 2266 } 2267 2268 void 2269 xmitEC(void) 2270 { 2271 NET2ADD(IAC, EC); 2272 printoption("SENT", IAC, EC); 2273 } 2274 2275 int 2276 dosynch(char *ch __unused) 2277 { 2278 netclear(); /* clear the path to the network */ 2279 NETADD(IAC); 2280 setneturg(); 2281 NETADD(DM); 2282 printoption("SENT", IAC, DM); 2283 return 1; 2284 } 2285 2286 int want_status_response = 0; 2287 2288 int 2289 get_status(char *ch __unused) 2290 { 2291 unsigned char tmp[16]; 2292 unsigned char *cp; 2293 2294 if (my_want_state_is_dont(TELOPT_STATUS)) { 2295 printf("Remote side does not support STATUS option\n"); 2296 return 0; 2297 } 2298 cp = tmp; 2299 2300 *cp++ = IAC; 2301 *cp++ = SB; 2302 *cp++ = TELOPT_STATUS; 2303 *cp++ = TELQUAL_SEND; 2304 *cp++ = IAC; 2305 *cp++ = SE; 2306 if (NETROOM() >= cp - tmp) { 2307 ring_supply_data(&netoring, tmp, cp-tmp); 2308 printsub('>', tmp+2, cp - tmp - 2); 2309 } 2310 ++want_status_response; 2311 return 1; 2312 } 2313 2314 void 2315 intp(void) 2316 { 2317 NET2ADD(IAC, IP); 2318 printoption("SENT", IAC, IP); 2319 flushline = 1; 2320 if (autoflush) { 2321 doflush(); 2322 } 2323 if (autosynch) { 2324 dosynch(NULL); 2325 } 2326 } 2327 2328 void 2329 sendbrk(void) 2330 { 2331 NET2ADD(IAC, BREAK); 2332 printoption("SENT", IAC, BREAK); 2333 flushline = 1; 2334 if (autoflush) { 2335 doflush(); 2336 } 2337 if (autosynch) { 2338 dosynch(NULL); 2339 } 2340 } 2341 2342 void 2343 sendabort(void) 2344 { 2345 NET2ADD(IAC, ABORT); 2346 printoption("SENT", IAC, ABORT); 2347 flushline = 1; 2348 if (autoflush) { 2349 doflush(); 2350 } 2351 if (autosynch) { 2352 dosynch(NULL); 2353 } 2354 } 2355 2356 void 2357 sendsusp(void) 2358 { 2359 NET2ADD(IAC, SUSP); 2360 printoption("SENT", IAC, SUSP); 2361 flushline = 1; 2362 if (autoflush) { 2363 doflush(); 2364 } 2365 if (autosynch) { 2366 dosynch(NULL); 2367 } 2368 } 2369 2370 void 2371 sendeof(void) 2372 { 2373 NET2ADD(IAC, xEOF); 2374 printoption("SENT", IAC, xEOF); 2375 } 2376 2377 void 2378 sendayt(void) 2379 { 2380 NET2ADD(IAC, AYT); 2381 printoption("SENT", IAC, AYT); 2382 } 2383 2384 /* 2385 * Send a window size update to the remote system. 2386 */ 2387 2388 void 2389 sendnaws(void) 2390 { 2391 long rows, cols; 2392 unsigned char tmp[16]; 2393 unsigned char *cp; 2394 2395 if (my_state_is_wont(TELOPT_NAWS)) 2396 return; 2397 2398 #define PUTSHORT(cp, x) { if ((*cp++ = ((x)>>8)&0xff) == IAC) *cp++ = IAC; \ 2399 if ((*cp++ = ((x))&0xff) == IAC) *cp++ = IAC; } 2400 2401 if (TerminalWindowSize(&rows, &cols) == 0) { /* Failed */ 2402 return; 2403 } 2404 2405 cp = tmp; 2406 2407 *cp++ = IAC; 2408 *cp++ = SB; 2409 *cp++ = TELOPT_NAWS; 2410 PUTSHORT(cp, cols); 2411 PUTSHORT(cp, rows); 2412 *cp++ = IAC; 2413 *cp++ = SE; 2414 if (NETROOM() >= cp - tmp) { 2415 ring_supply_data(&netoring, tmp, cp-tmp); 2416 printsub('>', tmp+2, cp - tmp - 2); 2417 } 2418 } 2419 2420 void 2421 tel_enter_binary(int rw) 2422 { 2423 if (rw&1) 2424 send_do(TELOPT_BINARY, 1); 2425 if (rw&2) 2426 send_will(TELOPT_BINARY, 1); 2427 } 2428 2429 void 2430 tel_leave_binary(int rw) 2431 { 2432 if (rw&1) 2433 send_dont(TELOPT_BINARY, 1); 2434 if (rw&2) 2435 send_wont(TELOPT_BINARY, 1); 2436 } 2437