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 * @(#)telnet.c 8.4 (Berkeley) 5/30/95 30 * $FreeBSD: src/crypto/telnet/telnet/telnet.c,v 1.4.2.5 2002/04/13 10:59:08 markm Exp $ 31 */ 32 33 #include <sys/types.h> 34 35 /* By the way, we need to include curses.h before telnet.h since, 36 * among other things, telnet.h #defines 'DO', which is a variable 37 * declared in curses.h. 38 */ 39 40 #include <ctype.h> 41 #include <curses.h> 42 #include <signal.h> 43 #include <stdlib.h> 44 #include <term.h> 45 #include <unistd.h> 46 #include <arpa/telnet.h> 47 48 #include "ring.h" 49 50 #include "defines.h" 51 #include "externs.h" 52 #include "types.h" 53 #include "general.h" 54 55 #ifdef AUTHENTICATION 56 #include <libtelnet/auth.h> 57 #endif 58 #ifdef ENCRYPTION 59 #include <libtelnet/encrypt.h> 60 #endif 61 #include <libtelnet/misc.h> 62 63 #define strip(x) ((my_want_state_is_wont(TELOPT_BINARY)) ? ((x)&0x7f) : (x)) 64 65 static unsigned char subbuffer[SUBBUFSIZE], 66 *subpointer, *subend; /* buffer for sub-options */ 67 #define SB_CLEAR() subpointer = subbuffer; 68 #define SB_TERM() { subend = subpointer; SB_CLEAR(); } 69 #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \ 70 *subpointer++ = (c); \ 71 } 72 73 #define SB_GET() ((*subpointer++)&0xff) 74 #define SB_PEEK() ((*subpointer)&0xff) 75 #define SB_EOF() (subpointer >= subend) 76 #define SB_LEN() (subend - subpointer) 77 78 char options[256]; /* The combined options */ 79 char do_dont_resp[256]; 80 char will_wont_resp[256]; 81 82 int 83 eight = 0, 84 autologin = 0, /* Autologin anyone? */ 85 skiprc = 0, 86 connected, 87 showoptions, 88 ISend, /* trying to send network data in */ 89 telnet_debug = 0, 90 crmod, 91 netdata, /* Print out network data flow */ 92 crlf, /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */ 93 telnetport, 94 SYNCHing, /* we are in TELNET SYNCH mode */ 95 flushout, /* flush output */ 96 autoflush = 0, /* flush output when interrupting? */ 97 autosynch, /* send interrupt characters with SYNCH? */ 98 localflow, /* we handle flow control locally */ 99 restartany, /* if flow control enabled, restart on any character */ 100 localchars, /* we recognize interrupt/quit */ 101 donelclchars, /* the user has set "localchars" */ 102 donebinarytoggle, /* the user has put us in binary */ 103 dontlecho, /* do we suppress local echoing right now? */ 104 globalmode, 105 doaddrlookup = 1, /* do a reverse address lookup? */ 106 clienteof = 0; 107 108 char *prompt = NULL; 109 #ifdef ENCRYPTION 110 char line[16]; /* hack around breakage in sra.c :-( !! */ 111 #endif 112 113 cc_t escape; 114 cc_t rlogin; 115 #ifdef KLUDGELINEMODE 116 cc_t echoc; 117 #endif 118 119 /* 120 * Telnet receiver states for fsm 121 */ 122 #define TS_DATA 0 123 #define TS_IAC 1 124 #define TS_WILL 2 125 #define TS_WONT 3 126 #define TS_DO 4 127 #define TS_DONT 5 128 #define TS_CR 6 129 #define TS_SB 7 /* sub-option collection */ 130 #define TS_SE 8 /* looking for sub-option end */ 131 132 static int telrcv_state; 133 #ifdef OLD_ENVIRON 134 unsigned char telopt_environ = TELOPT_NEW_ENVIRON; 135 #else 136 # define telopt_environ TELOPT_NEW_ENVIRON 137 #endif 138 139 jmp_buf toplevel; 140 jmp_buf peerdied; 141 142 int flushline; 143 int linemode; 144 145 #ifdef KLUDGELINEMODE 146 int kludgelinemode = 1; 147 #endif 148 149 static int is_unique(char *, char **, char **); 150 151 /* 152 * The following are some clocks used to decide how to interpret 153 * the relationship between various variables. 154 */ 155 156 Clocks clocks; 157 158 /* 159 * Initialize telnet environment. 160 */ 161 162 void 163 init_telnet(void) 164 { 165 env_init(); 166 167 SB_CLEAR(); 168 ClearArray(options); 169 170 connected = ISend = localflow = donebinarytoggle = 0; 171 #ifdef AUTHENTICATION 172 #ifdef ENCRYPTION 173 auth_encrypt_connect(connected); 174 #endif 175 #endif 176 restartany = -1; 177 178 SYNCHing = 0; 179 180 /* Don't change NetTrace */ 181 182 escape = CONTROL(']'); 183 rlogin = _POSIX_VDISABLE; 184 #ifdef KLUDGELINEMODE 185 echoc = CONTROL('E'); 186 #endif 187 188 flushline = 1; 189 telrcv_state = TS_DATA; 190 } 191 192 193 /* 194 * These routines are in charge of sending option negotiations 195 * to the other side. 196 * 197 * The basic idea is that we send the negotiation if either side 198 * is in disagreement as to what the current state should be. 199 */ 200 201 void 202 send_do(int c, int init) 203 { 204 if (init) { 205 if (((do_dont_resp[c] == 0) && my_state_is_do(c)) || 206 my_want_state_is_do(c)) 207 return; 208 set_my_want_state_do(c); 209 do_dont_resp[c]++; 210 } 211 NET2ADD(IAC, DO); 212 NETADD(c); 213 printoption("SENT", DO, c); 214 } 215 216 void 217 send_dont(int c, int init) 218 { 219 if (init) { 220 if (((do_dont_resp[c] == 0) && my_state_is_dont(c)) || 221 my_want_state_is_dont(c)) 222 return; 223 set_my_want_state_dont(c); 224 do_dont_resp[c]++; 225 } 226 NET2ADD(IAC, DONT); 227 NETADD(c); 228 printoption("SENT", DONT, c); 229 } 230 231 void 232 send_will(int c, int init) 233 { 234 if (init) { 235 if (((will_wont_resp[c] == 0) && my_state_is_will(c)) || 236 my_want_state_is_will(c)) 237 return; 238 set_my_want_state_will(c); 239 will_wont_resp[c]++; 240 } 241 NET2ADD(IAC, WILL); 242 NETADD(c); 243 printoption("SENT", WILL, c); 244 } 245 246 void 247 send_wont(int c, int init) 248 { 249 if (init) { 250 if (((will_wont_resp[c] == 0) && my_state_is_wont(c)) || 251 my_want_state_is_wont(c)) 252 return; 253 set_my_want_state_wont(c); 254 will_wont_resp[c]++; 255 } 256 NET2ADD(IAC, WONT); 257 NETADD(c); 258 printoption("SENT", WONT, c); 259 } 260 261 void 262 willoption(int option) 263 { 264 int new_state_ok = 0; 265 266 if (do_dont_resp[option]) { 267 --do_dont_resp[option]; 268 if (do_dont_resp[option] && my_state_is_do(option)) 269 --do_dont_resp[option]; 270 } 271 272 if ((do_dont_resp[option] == 0) && my_want_state_is_dont(option)) { 273 274 switch (option) { 275 276 case TELOPT_ECHO: 277 case TELOPT_BINARY: 278 case TELOPT_SGA: 279 settimer(modenegotiated); 280 /* FALL THROUGH */ 281 case TELOPT_STATUS: 282 #ifdef AUTHENTICATION 283 case TELOPT_AUTHENTICATION: 284 #endif 285 #ifdef ENCRYPTION 286 case TELOPT_ENCRYPT: 287 #endif /* ENCRYPTION */ 288 new_state_ok = 1; 289 break; 290 291 case TELOPT_TM: 292 if (flushout) 293 flushout = 0; 294 /* 295 * Special case for TM. If we get back a WILL, 296 * pretend we got back a WONT. 297 */ 298 set_my_want_state_dont(option); 299 set_my_state_dont(option); 300 return; /* Never reply to TM will's/wont's */ 301 302 case TELOPT_LINEMODE: 303 default: 304 break; 305 } 306 307 if (new_state_ok) { 308 set_my_want_state_do(option); 309 send_do(option, 0); 310 setconnmode(0); /* possibly set new tty mode */ 311 } else { 312 do_dont_resp[option]++; 313 send_dont(option, 0); 314 } 315 } 316 set_my_state_do(option); 317 #ifdef ENCRYPTION 318 if (option == TELOPT_ENCRYPT) 319 encrypt_send_support(); 320 #endif /* ENCRYPTION */ 321 } 322 323 void 324 wontoption(int option) 325 { 326 if (do_dont_resp[option]) { 327 --do_dont_resp[option]; 328 if (do_dont_resp[option] && my_state_is_dont(option)) 329 --do_dont_resp[option]; 330 } 331 332 if ((do_dont_resp[option] == 0) && my_want_state_is_do(option)) { 333 334 switch (option) { 335 336 #ifdef KLUDGELINEMODE 337 case TELOPT_SGA: 338 if (!kludgelinemode) 339 break; 340 /* FALL THROUGH */ 341 #endif 342 case TELOPT_ECHO: 343 settimer(modenegotiated); 344 break; 345 346 case TELOPT_TM: 347 if (flushout) 348 flushout = 0; 349 set_my_want_state_dont(option); 350 set_my_state_dont(option); 351 return; /* Never reply to TM will's/wont's */ 352 353 default: 354 break; 355 } 356 set_my_want_state_dont(option); 357 if (my_state_is_do(option)) 358 send_dont(option, 0); 359 setconnmode(0); /* Set new tty mode */ 360 } else if (option == TELOPT_TM) { 361 /* 362 * Special case for TM. 363 */ 364 if (flushout) 365 flushout = 0; 366 set_my_want_state_dont(option); 367 } 368 set_my_state_dont(option); 369 } 370 371 static void 372 dooption(int option) 373 { 374 int new_state_ok = 0; 375 376 if (will_wont_resp[option]) { 377 --will_wont_resp[option]; 378 if (will_wont_resp[option] && my_state_is_will(option)) 379 --will_wont_resp[option]; 380 } 381 382 if (will_wont_resp[option] == 0) { 383 if (my_want_state_is_wont(option)) { 384 385 switch (option) { 386 387 case TELOPT_TM: 388 /* 389 * Special case for TM. We send a WILL, but pretend 390 * we sent WONT. 391 */ 392 send_will(option, 0); 393 set_my_want_state_wont(TELOPT_TM); 394 set_my_state_wont(TELOPT_TM); 395 return; 396 397 case TELOPT_BINARY: /* binary mode */ 398 case TELOPT_NAWS: /* window size */ 399 case TELOPT_TSPEED: /* terminal speed */ 400 case TELOPT_LFLOW: /* local flow control */ 401 case TELOPT_TTYPE: /* terminal type option */ 402 case TELOPT_SGA: /* no big deal */ 403 #ifdef ENCRYPTION 404 case TELOPT_ENCRYPT: /* encryption variable option */ 405 #endif /* ENCRYPTION */ 406 new_state_ok = 1; 407 break; 408 409 case TELOPT_NEW_ENVIRON: /* New environment variable option */ 410 #ifdef OLD_ENVIRON 411 if (my_state_is_will(TELOPT_OLD_ENVIRON)) 412 send_wont(TELOPT_OLD_ENVIRON, 1); /* turn off the old */ 413 goto env_common; 414 case TELOPT_OLD_ENVIRON: /* Old environment variable option */ 415 if (my_state_is_will(TELOPT_NEW_ENVIRON)) 416 break; /* Don't enable if new one is in use! */ 417 env_common: 418 telopt_environ = option; 419 #endif 420 new_state_ok = 1; 421 break; 422 423 #ifdef AUTHENTICATION 424 case TELOPT_AUTHENTICATION: 425 if (autologin) 426 new_state_ok = 1; 427 break; 428 #endif 429 430 case TELOPT_XDISPLOC: /* X Display location */ 431 if (env_getvalue("DISPLAY")) 432 new_state_ok = 1; 433 break; 434 435 case TELOPT_LINEMODE: 436 #ifdef KLUDGELINEMODE 437 kludgelinemode = 0; 438 send_do(TELOPT_SGA, 1); 439 #endif 440 set_my_want_state_will(TELOPT_LINEMODE); 441 send_will(option, 0); 442 set_my_state_will(TELOPT_LINEMODE); 443 slc_init(); 444 return; 445 446 case TELOPT_ECHO: /* We're never going to echo... */ 447 default: 448 break; 449 } 450 451 if (new_state_ok) { 452 set_my_want_state_will(option); 453 send_will(option, 0); 454 setconnmode(0); /* Set new tty mode */ 455 } else { 456 will_wont_resp[option]++; 457 send_wont(option, 0); 458 } 459 } else { 460 /* 461 * Handle options that need more things done after the 462 * other side has acknowledged the option. 463 */ 464 switch (option) { 465 case TELOPT_LINEMODE: 466 #ifdef KLUDGELINEMODE 467 kludgelinemode = 0; 468 send_do(TELOPT_SGA, 1); 469 #endif 470 set_my_state_will(option); 471 slc_init(); 472 send_do(TELOPT_SGA, 0); 473 return; 474 } 475 } 476 } 477 set_my_state_will(option); 478 } 479 480 static void 481 dontoption(int option) 482 { 483 484 if (will_wont_resp[option]) { 485 --will_wont_resp[option]; 486 if (will_wont_resp[option] && my_state_is_wont(option)) 487 --will_wont_resp[option]; 488 } 489 490 if ((will_wont_resp[option] == 0) && my_want_state_is_will(option)) { 491 switch (option) { 492 case TELOPT_LINEMODE: 493 linemode = 0; /* put us back to the default state */ 494 break; 495 #ifdef OLD_ENVIRON 496 case TELOPT_NEW_ENVIRON: 497 /* 498 * The new environ option wasn't recognized, try 499 * the old one. 500 */ 501 send_will(TELOPT_OLD_ENVIRON, 1); 502 telopt_environ = TELOPT_OLD_ENVIRON; 503 break; 504 #endif 505 } 506 /* we always accept a DONT */ 507 set_my_want_state_wont(option); 508 if (my_state_is_will(option)) 509 send_wont(option, 0); 510 setconnmode(0); /* Set new tty mode */ 511 } 512 set_my_state_wont(option); 513 } 514 515 /* 516 * Given a buffer returned by tgetent(), this routine will turn 517 * the pipe separated list of names in the buffer into an array 518 * of pointers to null terminated names. We toss out any bad, 519 * duplicate, or verbose names (names with spaces). 520 */ 521 522 static const char *name_unknown = "UNKNOWN"; 523 static const char *unknown[] = { NULL, NULL }; 524 525 static const char ** 526 mklist(char *buf, char *name) 527 { 528 int n; 529 char c, *cp, **argvp, *cp2, **argv, **avt; 530 531 if (name) { 532 if (strlen(name) > 40) { 533 name = NULL; 534 unknown[0] = name_unknown; 535 } else { 536 unknown[0] = name; 537 upcase(name); 538 } 539 } else 540 unknown[0] = name_unknown; 541 /* 542 * Count up the number of names. 543 */ 544 for (n = 1, cp = buf; *cp && *cp != ':'; cp++) { 545 if (*cp == '|') 546 n++; 547 } 548 /* 549 * Allocate an array to put the name pointers into 550 */ 551 argv = (char **)malloc((n+3)*sizeof(char *)); 552 if (argv == NULL) 553 return(unknown); 554 555 /* 556 * Fill up the array of pointers to names. 557 */ 558 *argv = NULL; 559 argvp = argv+1; 560 n = 0; 561 for (cp = cp2 = buf; (c = *cp); cp++) { 562 if (c == '|' || c == ':') { 563 *cp++ = '\0'; 564 /* 565 * Skip entries that have spaces or are over 40 566 * characters long. If this is our environment 567 * name, then put it up front. Otherwise, as 568 * long as this is not a duplicate name (case 569 * insensitive) add it to the list. 570 */ 571 if (n || (cp - cp2 > 41)) 572 ; 573 else if (name && (strncasecmp(name, cp2, cp-cp2) == 0)) 574 *argv = cp2; 575 else if (is_unique(cp2, argv+1, argvp)) 576 *argvp++ = cp2; 577 if (c == ':') 578 break; 579 /* 580 * Skip multiple delimiters. Reset cp2 to 581 * the beginning of the next name. Reset n, 582 * the flag for names with spaces. 583 */ 584 while ((c = *cp) == '|') 585 cp++; 586 cp2 = cp; 587 n = 0; 588 } 589 /* 590 * Skip entries with spaces or non-ascii values. 591 * Convert lower case letters to upper case. 592 */ 593 if ((c == ' ') || !isascii(c)) 594 n = 1; 595 else if (islower(c)) 596 *cp = toupper(c); 597 } 598 599 /* 600 * Check for an old V6 2 character name. If the second 601 * name points to the beginning of the buffer, and is 602 * only 2 characters long, move it to the end of the array. 603 */ 604 if ((argv[1] == buf) && (strlen(argv[1]) == 2)) { 605 --argvp; 606 for (avt = &argv[1]; avt < argvp; avt++) 607 *avt = *(avt+1); 608 *argvp++ = buf; 609 } 610 611 /* 612 * Duplicate last name, for TTYPE option, and null 613 * terminate the array. If we didn't find a match on 614 * our terminal name, put that name at the beginning. 615 */ 616 cp = *(argvp-1); 617 *argvp++ = cp; 618 *argvp = NULL; 619 620 if (*argv == NULL) { 621 if (name) 622 *argv = name; 623 else { 624 --argvp; 625 for (avt = argv; avt < argvp; avt++) 626 *avt = *(avt+1); 627 } 628 } 629 if (*argv) 630 return((const char **)argv); 631 else 632 return(unknown); 633 } 634 635 static int 636 is_unique(char *name, char **as, char **ae) 637 { 638 char **ap; 639 int n; 640 641 n = strlen(name) + 1; 642 for (ap = as; ap < ae; ap++) 643 if (strncasecmp(*ap, name, n) == 0) 644 return(0); 645 return (1); 646 } 647 648 #ifdef TERMCAP 649 char termbuf[1024]; 650 651 /*ARGSUSED*/ 652 static int 653 setupterm(char *tname, int fd, int *errp) 654 { 655 if (tgetent(termbuf, tname) == 1) { 656 termbuf[1023] = '\0'; 657 if (errp) 658 *errp = 1; 659 return(0); 660 } 661 if (errp) 662 *errp = 0; 663 return(-1); 664 } 665 #else 666 #define termbuf ttytype 667 extern char ttytype[]; 668 #endif 669 670 int resettermname = 1; 671 672 static const char * 673 gettermname(void) 674 { 675 char *tname; 676 static const char **tnamep = NULL; 677 static const char **next; 678 int err; 679 680 if (resettermname) { 681 resettermname = 0; 682 if (tnamep && tnamep != unknown) 683 free(tnamep); 684 if ((tname = env_getvalue("TERM")) && 685 (setupterm(tname, 1, &err) == 0)) { 686 tnamep = mklist(termbuf, tname); 687 } else { 688 if (tname && (strlen(tname) <= 40)) { 689 unknown[0] = tname; 690 upcase(tname); 691 } else 692 unknown[0] = name_unknown; 693 tnamep = unknown; 694 } 695 next = tnamep; 696 } 697 if (*next == NULL) 698 next = tnamep; 699 return(*next++); 700 } 701 /* 702 * suboption() 703 * 704 * Look at the sub-option buffer, and try to be helpful to the other 705 * side. 706 * 707 * Currently we recognize: 708 * 709 * Terminal type, send request. 710 * Terminal speed (send request). 711 * Local flow control (is request). 712 * Linemode 713 */ 714 715 static void 716 suboption(void) 717 { 718 unsigned char subchar; 719 720 printsub('<', subbuffer, SB_LEN()+2); 721 switch (subchar = SB_GET()) { 722 case TELOPT_TTYPE: 723 if (my_want_state_is_wont(TELOPT_TTYPE)) 724 return; 725 if (SB_EOF() || SB_GET() != TELQUAL_SEND) { 726 return; 727 } else { 728 const char *name; 729 unsigned char temp[50]; 730 int len; 731 732 name = gettermname(); 733 len = strlen(name) + 4 + 2; 734 if (len < NETROOM()) { 735 snprintf(temp, sizeof(temp), "%c%c%c%c%s%c%c", 736 IAC, SB, TELOPT_TTYPE, TELQUAL_IS, name, IAC, SE); 737 ring_supply_data(&netoring, temp, len); 738 printsub('>', &temp[2], len-2); 739 } else { 740 ExitString("No room in buffer for terminal type.\n", 1); 741 /*NOTREACHED*/ 742 } 743 } 744 break; 745 case TELOPT_TSPEED: 746 if (my_want_state_is_wont(TELOPT_TSPEED)) 747 return; 748 if (SB_EOF()) 749 return; 750 if (SB_GET() == TELQUAL_SEND) { 751 long ospeed, ispeed; 752 unsigned char temp[50]; 753 int len; 754 755 TerminalSpeeds(&ispeed, &ospeed); 756 757 snprintf((char *)temp, sizeof(temp), "%c%c%c%c%ld,%ld%c%c", 758 IAC, SB, TELOPT_TSPEED, TELQUAL_IS, 759 ospeed, ispeed, IAC, SE); 760 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 761 762 if (len < NETROOM()) { 763 ring_supply_data(&netoring, temp, len); 764 printsub('>', temp+2, len - 2); 765 } 766 /*@*/ else printf("lm_will: not enough room in buffer\n"); 767 } 768 break; 769 case TELOPT_LFLOW: 770 if (my_want_state_is_wont(TELOPT_LFLOW)) 771 return; 772 if (SB_EOF()) 773 return; 774 switch(SB_GET()) { 775 case LFLOW_RESTART_ANY: 776 restartany = 1; 777 break; 778 case LFLOW_RESTART_XON: 779 restartany = 0; 780 break; 781 case LFLOW_ON: 782 localflow = 1; 783 break; 784 case LFLOW_OFF: 785 localflow = 0; 786 break; 787 default: 788 return; 789 } 790 setcommandmode(); 791 setconnmode(0); 792 break; 793 794 case TELOPT_LINEMODE: 795 if (my_want_state_is_wont(TELOPT_LINEMODE)) 796 return; 797 if (SB_EOF()) 798 return; 799 switch (SB_GET()) { 800 case WILL: 801 lm_will(subpointer, SB_LEN()); 802 break; 803 case WONT: 804 lm_wont(subpointer, SB_LEN()); 805 break; 806 case DO: 807 lm_do(subpointer, SB_LEN()); 808 break; 809 case DONT: 810 lm_dont(subpointer, SB_LEN()); 811 break; 812 case LM_SLC: 813 slc(subpointer, SB_LEN()); 814 break; 815 case LM_MODE: 816 lm_mode(subpointer, SB_LEN(), 0); 817 break; 818 default: 819 break; 820 } 821 break; 822 823 #ifdef OLD_ENVIRON 824 case TELOPT_OLD_ENVIRON: 825 #endif 826 case TELOPT_NEW_ENVIRON: 827 if (SB_EOF()) 828 return; 829 switch(SB_PEEK()) { 830 case TELQUAL_IS: 831 case TELQUAL_INFO: 832 if (my_want_state_is_dont(subchar)) 833 return; 834 break; 835 case TELQUAL_SEND: 836 if (my_want_state_is_wont(subchar)) { 837 return; 838 } 839 break; 840 default: 841 return; 842 } 843 env_opt(subpointer, SB_LEN()); 844 break; 845 846 case TELOPT_XDISPLOC: 847 if (my_want_state_is_wont(TELOPT_XDISPLOC)) 848 return; 849 if (SB_EOF()) 850 return; 851 if (SB_GET() == TELQUAL_SEND) { 852 unsigned char temp[50], *dp; 853 int len; 854 855 if ((dp = env_getvalue("DISPLAY")) == NULL || 856 strlen(dp) > sizeof(temp) - 7) { 857 /* 858 * Something happened, we no longer have a DISPLAY 859 * variable. Or it is too long. So, turn off the option. 860 */ 861 send_wont(TELOPT_XDISPLOC, 1); 862 break; 863 } 864 snprintf(temp, sizeof(temp), "%c%c%c%c%s%c%c", IAC, SB, 865 TELOPT_XDISPLOC, TELQUAL_IS, dp, IAC, SE); 866 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 867 868 if (len < NETROOM()) { 869 ring_supply_data(&netoring, temp, len); 870 printsub('>', temp+2, len - 2); 871 } 872 /*@*/ else printf("lm_will: not enough room in buffer\n"); 873 } 874 break; 875 876 #ifdef AUTHENTICATION 877 case TELOPT_AUTHENTICATION: { 878 if (!autologin) 879 break; 880 if (SB_EOF()) 881 return; 882 switch(SB_GET()) { 883 case TELQUAL_IS: 884 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 885 return; 886 auth_is(subpointer, SB_LEN()); 887 break; 888 case TELQUAL_SEND: 889 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 890 return; 891 auth_send(subpointer, SB_LEN()); 892 break; 893 case TELQUAL_REPLY: 894 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 895 return; 896 auth_reply(subpointer, SB_LEN()); 897 break; 898 case TELQUAL_NAME: 899 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 900 return; 901 auth_name(subpointer, SB_LEN()); 902 break; 903 } 904 } 905 break; 906 #endif 907 #ifdef ENCRYPTION 908 case TELOPT_ENCRYPT: 909 if (SB_EOF()) 910 return; 911 switch(SB_GET()) { 912 case ENCRYPT_START: 913 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 914 return; 915 encrypt_start(subpointer, SB_LEN()); 916 break; 917 case ENCRYPT_END: 918 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 919 return; 920 encrypt_end(); 921 break; 922 case ENCRYPT_SUPPORT: 923 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 924 return; 925 encrypt_support(subpointer, SB_LEN()); 926 break; 927 case ENCRYPT_REQSTART: 928 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 929 return; 930 encrypt_request_start(subpointer, SB_LEN()); 931 break; 932 case ENCRYPT_REQEND: 933 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 934 return; 935 /* 936 * We can always send an REQEND so that we cannot 937 * get stuck encrypting. We should only get this 938 * if we have been able to get in the correct mode 939 * anyhow. 940 */ 941 encrypt_request_end(); 942 break; 943 case ENCRYPT_IS: 944 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 945 return; 946 encrypt_is(subpointer, SB_LEN()); 947 break; 948 case ENCRYPT_REPLY: 949 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 950 return; 951 encrypt_reply(subpointer, SB_LEN()); 952 break; 953 case ENCRYPT_ENC_KEYID: 954 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 955 return; 956 encrypt_enc_keyid(subpointer, SB_LEN()); 957 break; 958 case ENCRYPT_DEC_KEYID: 959 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 960 return; 961 encrypt_dec_keyid(subpointer, SB_LEN()); 962 break; 963 default: 964 break; 965 } 966 break; 967 #endif /* ENCRYPTION */ 968 default: 969 break; 970 } 971 } 972 973 static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE }; 974 975 void 976 lm_will(unsigned char *cmd, int len) 977 { 978 if (len < 1) { 979 /*@*/ printf("lm_will: no command!!!\n"); /* Should not happen... */ 980 return; 981 } 982 switch(cmd[0]) { 983 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 984 default: 985 str_lm[3] = DONT; 986 str_lm[4] = cmd[0]; 987 if (NETROOM() > (int)sizeof(str_lm)) { 988 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 989 printsub('>', &str_lm[2], sizeof(str_lm)-2); 990 } 991 /*@*/ else printf("lm_will: not enough room in buffer\n"); 992 break; 993 } 994 } 995 996 void 997 lm_wont(unsigned char *cmd, int len) 998 { 999 if (len < 1) { 1000 /*@*/ printf("lm_wont: no command!!!\n"); /* Should not happen... */ 1001 return; 1002 } 1003 switch(cmd[0]) { 1004 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 1005 default: 1006 /* We are always DONT, so don't respond */ 1007 return; 1008 } 1009 } 1010 1011 void 1012 lm_do(unsigned char *cmd, int len) 1013 { 1014 if (len < 1) { 1015 /*@*/ printf("lm_do: no command!!!\n"); /* Should not happen... */ 1016 return; 1017 } 1018 switch(cmd[0]) { 1019 case LM_FORWARDMASK: 1020 default: 1021 str_lm[3] = WONT; 1022 str_lm[4] = cmd[0]; 1023 if (NETROOM() > (int)sizeof(str_lm)) { 1024 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 1025 printsub('>', &str_lm[2], sizeof(str_lm)-2); 1026 } 1027 /*@*/ else printf("lm_do: not enough room in buffer\n"); 1028 break; 1029 } 1030 } 1031 1032 void 1033 lm_dont(unsigned char *cmd, int len) 1034 { 1035 if (len < 1) { 1036 /*@*/ printf("lm_dont: no command!!!\n"); /* Should not happen... */ 1037 return; 1038 } 1039 switch(cmd[0]) { 1040 case LM_FORWARDMASK: 1041 default: 1042 /* we are always WONT, so don't respond */ 1043 break; 1044 } 1045 } 1046 1047 static unsigned char str_lm_mode[] = { 1048 IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE 1049 }; 1050 1051 void 1052 lm_mode(unsigned char *cmd, int len, int init) 1053 { 1054 if (len != 1) 1055 return; 1056 if ((linemode&MODE_MASK&~MODE_ACK) == *cmd) 1057 return; 1058 if (*cmd&MODE_ACK) 1059 return; 1060 linemode = *cmd&(MODE_MASK&~MODE_ACK); 1061 str_lm_mode[4] = linemode; 1062 if (!init) 1063 str_lm_mode[4] |= MODE_ACK; 1064 if (NETROOM() > (int)sizeof(str_lm_mode)) { 1065 ring_supply_data(&netoring, str_lm_mode, sizeof(str_lm_mode)); 1066 printsub('>', &str_lm_mode[2], sizeof(str_lm_mode)-2); 1067 } 1068 /*@*/ else printf("lm_mode: not enough room in buffer\n"); 1069 setconnmode(0); /* set changed mode */ 1070 } 1071 1072 1073 1074 /* 1075 * slc() 1076 * Handle special character suboption of LINEMODE. 1077 */ 1078 1079 struct spc { 1080 cc_t val; 1081 cc_t *valp; 1082 char flags; /* Current flags & level */ 1083 char mylevel; /* Maximum level & flags */ 1084 } spc_data[NSLC+1]; 1085 1086 #define SLC_IMPORT 0 1087 #define SLC_EXPORT 1 1088 #define SLC_RVALUE 2 1089 static int slc_mode = SLC_EXPORT; 1090 1091 void 1092 slc_init(void) 1093 { 1094 struct spc *spcp; 1095 1096 localchars = 1; 1097 for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) { 1098 spcp->val = 0; 1099 spcp->valp = NULL; 1100 spcp->flags = spcp->mylevel = SLC_NOSUPPORT; 1101 } 1102 1103 #define initfunc(func, flags) { \ 1104 spcp = &spc_data[func]; \ 1105 if ((spcp->valp = tcval(func))) { \ 1106 spcp->val = *spcp->valp; \ 1107 spcp->mylevel = SLC_VARIABLE|flags; \ 1108 } else { \ 1109 spcp->val = 0; \ 1110 spcp->mylevel = SLC_DEFAULT; \ 1111 } \ 1112 } 1113 1114 initfunc(SLC_SYNCH, 0); 1115 /* No BRK */ 1116 initfunc(SLC_AO, 0); 1117 initfunc(SLC_AYT, 0); 1118 /* No EOR */ 1119 initfunc(SLC_ABORT, SLC_FLUSHIN|SLC_FLUSHOUT); 1120 initfunc(SLC_EOF, 0); 1121 #ifndef SYSV_TERMIO 1122 initfunc(SLC_SUSP, SLC_FLUSHIN); 1123 #endif 1124 initfunc(SLC_EC, 0); 1125 initfunc(SLC_EL, 0); 1126 #ifndef SYSV_TERMIO 1127 initfunc(SLC_EW, 0); 1128 initfunc(SLC_RP, 0); 1129 initfunc(SLC_LNEXT, 0); 1130 #endif 1131 initfunc(SLC_XON, 0); 1132 initfunc(SLC_XOFF, 0); 1133 #ifdef SYSV_TERMIO 1134 spc_data[SLC_XON].mylevel = SLC_CANTCHANGE; 1135 spc_data[SLC_XOFF].mylevel = SLC_CANTCHANGE; 1136 #endif 1137 initfunc(SLC_FORW1, 0); 1138 #ifdef USE_TERMIO 1139 initfunc(SLC_FORW2, 0); 1140 /* No FORW2 */ 1141 #endif 1142 1143 initfunc(SLC_IP, SLC_FLUSHIN|SLC_FLUSHOUT); 1144 #undef initfunc 1145 1146 if (slc_mode == SLC_EXPORT) 1147 slc_export(); 1148 else 1149 slc_import(1); 1150 1151 } 1152 1153 void 1154 slcstate(void) 1155 { 1156 printf("Special characters are %s values\n", 1157 slc_mode == SLC_IMPORT ? "remote default" : 1158 slc_mode == SLC_EXPORT ? "local" : 1159 "remote"); 1160 } 1161 1162 void 1163 slc_mode_export(void) 1164 { 1165 slc_mode = SLC_EXPORT; 1166 if (my_state_is_will(TELOPT_LINEMODE)) 1167 slc_export(); 1168 } 1169 1170 void 1171 slc_mode_import(int def) 1172 { 1173 slc_mode = def ? SLC_IMPORT : SLC_RVALUE; 1174 if (my_state_is_will(TELOPT_LINEMODE)) 1175 slc_import(def); 1176 } 1177 1178 unsigned char slc_import_val[] = { 1179 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE 1180 }; 1181 unsigned char slc_import_def[] = { 1182 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE 1183 }; 1184 1185 void 1186 slc_import(int def) 1187 { 1188 if (NETROOM() > (int)sizeof(slc_import_val)) { 1189 if (def) { 1190 ring_supply_data(&netoring, slc_import_def, sizeof(slc_import_def)); 1191 printsub('>', &slc_import_def[2], sizeof(slc_import_def)-2); 1192 } else { 1193 ring_supply_data(&netoring, slc_import_val, sizeof(slc_import_val)); 1194 printsub('>', &slc_import_val[2], sizeof(slc_import_val)-2); 1195 } 1196 } 1197 /*@*/ else printf("slc_import: not enough room\n"); 1198 } 1199 1200 void 1201 slc_export(void) 1202 { 1203 struct spc *spcp; 1204 1205 TerminalDefaultChars(); 1206 1207 slc_start_reply(); 1208 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1209 if (spcp->mylevel != SLC_NOSUPPORT) { 1210 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1211 spcp->flags = SLC_NOSUPPORT; 1212 else 1213 spcp->flags = spcp->mylevel; 1214 if (spcp->valp) 1215 spcp->val = *spcp->valp; 1216 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1217 } 1218 } 1219 slc_end_reply(); 1220 (void)slc_update(); 1221 setconnmode(1); /* Make sure the character values are set */ 1222 } 1223 1224 void 1225 slc(unsigned char *cp, int len) 1226 { 1227 struct spc *spcp; 1228 int func,level; 1229 1230 slc_start_reply(); 1231 1232 for (; len >= 3; len -=3, cp +=3) { 1233 1234 func = cp[SLC_FUNC]; 1235 1236 if (func == 0) { 1237 /* 1238 * Client side: always ignore 0 function. 1239 */ 1240 continue; 1241 } 1242 if (func > NSLC) { 1243 if ((cp[SLC_FLAGS] & SLC_LEVELBITS) != SLC_NOSUPPORT) 1244 slc_add_reply(func, SLC_NOSUPPORT, 0); 1245 continue; 1246 } 1247 1248 spcp = &spc_data[func]; 1249 1250 level = cp[SLC_FLAGS]&(SLC_LEVELBITS|SLC_ACK); 1251 1252 if ((cp[SLC_VALUE] == (unsigned char)spcp->val) && 1253 ((level&SLC_LEVELBITS) == (spcp->flags&SLC_LEVELBITS))) { 1254 continue; 1255 } 1256 1257 if (level == (SLC_DEFAULT|SLC_ACK)) { 1258 /* 1259 * This is an error condition, the SLC_ACK 1260 * bit should never be set for the SLC_DEFAULT 1261 * level. Our best guess to recover is to 1262 * ignore the SLC_ACK bit. 1263 */ 1264 cp[SLC_FLAGS] &= ~SLC_ACK; 1265 } 1266 1267 if (level == ((spcp->flags&SLC_LEVELBITS)|SLC_ACK)) { 1268 spcp->val = (cc_t)cp[SLC_VALUE]; 1269 spcp->flags = cp[SLC_FLAGS]; /* include SLC_ACK */ 1270 continue; 1271 } 1272 1273 level &= ~SLC_ACK; 1274 1275 if (level <= (spcp->mylevel&SLC_LEVELBITS)) { 1276 spcp->flags = cp[SLC_FLAGS]|SLC_ACK; 1277 spcp->val = (cc_t)cp[SLC_VALUE]; 1278 } 1279 if (level == SLC_DEFAULT) { 1280 if ((spcp->mylevel&SLC_LEVELBITS) != SLC_DEFAULT) 1281 spcp->flags = spcp->mylevel; 1282 else 1283 spcp->flags = SLC_NOSUPPORT; 1284 } 1285 slc_add_reply(func, spcp->flags, spcp->val); 1286 } 1287 slc_end_reply(); 1288 if (slc_update()) 1289 setconnmode(1); /* set the new character values */ 1290 } 1291 1292 void 1293 slc_check(void) 1294 { 1295 struct spc *spcp; 1296 1297 slc_start_reply(); 1298 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1299 if (spcp->valp && spcp->val != *spcp->valp) { 1300 spcp->val = *spcp->valp; 1301 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1302 spcp->flags = SLC_NOSUPPORT; 1303 else 1304 spcp->flags = spcp->mylevel; 1305 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1306 } 1307 } 1308 slc_end_reply(); 1309 setconnmode(1); 1310 } 1311 1312 unsigned char slc_reply[128]; 1313 unsigned char const * const slc_reply_eom = &slc_reply[sizeof(slc_reply)]; 1314 unsigned char *slc_replyp; 1315 1316 void 1317 slc_start_reply(void) 1318 { 1319 slc_replyp = slc_reply; 1320 *slc_replyp++ = IAC; 1321 *slc_replyp++ = SB; 1322 *slc_replyp++ = TELOPT_LINEMODE; 1323 *slc_replyp++ = LM_SLC; 1324 } 1325 1326 void 1327 slc_add_reply(unsigned char func, unsigned char flags, cc_t value) 1328 { 1329 /* A sequence of up to 6 bytes my be written for this member of the SLC 1330 * suboption list by this function. The end of negotiation command, 1331 * which is written by slc_end_reply(), will require 2 additional 1332 * bytes. Do not proceed unless there is sufficient space for these 1333 * items. 1334 */ 1335 if (&slc_replyp[6+2] > slc_reply_eom) 1336 return; 1337 if ((*slc_replyp++ = func) == IAC) 1338 *slc_replyp++ = IAC; 1339 if ((*slc_replyp++ = flags) == IAC) 1340 *slc_replyp++ = IAC; 1341 if ((*slc_replyp++ = (unsigned char)value) == IAC) 1342 *slc_replyp++ = IAC; 1343 } 1344 1345 void 1346 slc_end_reply(void) 1347 { 1348 int len; 1349 /* The end of negotiation command requires 2 bytes. */ 1350 if (&slc_replyp[2] > slc_reply_eom) 1351 return; 1352 *slc_replyp++ = IAC; 1353 *slc_replyp++ = SE; 1354 len = slc_replyp - slc_reply; 1355 if (len <= 6) 1356 return; 1357 if (NETROOM() > len) { 1358 ring_supply_data(&netoring, slc_reply, slc_replyp - slc_reply); 1359 printsub('>', &slc_reply[2], slc_replyp - slc_reply - 2); 1360 } 1361 /*@*/else printf("slc_end_reply: not enough room\n"); 1362 } 1363 1364 int 1365 slc_update(void) 1366 { 1367 struct spc *spcp; 1368 int need_update = 0; 1369 1370 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1371 if (!(spcp->flags&SLC_ACK)) 1372 continue; 1373 spcp->flags &= ~SLC_ACK; 1374 if (spcp->valp && (*spcp->valp != spcp->val)) { 1375 *spcp->valp = spcp->val; 1376 need_update = 1; 1377 } 1378 } 1379 return(need_update); 1380 } 1381 1382 #ifdef OLD_ENVIRON 1383 # ifdef ENV_HACK 1384 /* 1385 * Earlier version of telnet/telnetd from the BSD code had 1386 * the definitions of VALUE and VAR reversed. To ensure 1387 * maximum interoperability, we assume that the server is 1388 * an older BSD server, until proven otherwise. The newer 1389 * BSD servers should be able to handle either definition, 1390 * so it is better to use the wrong values if we don't 1391 * know what type of server it is. 1392 */ 1393 int env_auto = 1; 1394 int old_env_var = OLD_ENV_VAR; 1395 int old_env_value = OLD_ENV_VALUE; 1396 # else 1397 # define old_env_var OLD_ENV_VAR 1398 # define old_env_value OLD_ENV_VALUE 1399 # endif 1400 #endif 1401 1402 void 1403 env_opt(unsigned char *buf, int len) 1404 { 1405 unsigned char *ep = NULL, *epc = NULL; 1406 int i; 1407 1408 switch(buf[0]&0xff) { 1409 case TELQUAL_SEND: 1410 env_opt_start(); 1411 if (len == 1) { 1412 env_opt_add(NULL); 1413 } else for (i = 1; i < len; i++) { 1414 switch (buf[i]&0xff) { 1415 #ifdef OLD_ENVIRON 1416 case OLD_ENV_VAR: 1417 # ifdef ENV_HACK 1418 if (telopt_environ == TELOPT_OLD_ENVIRON 1419 && env_auto) { 1420 /* Server has the same definitions */ 1421 old_env_var = OLD_ENV_VAR; 1422 old_env_value = OLD_ENV_VALUE; 1423 } 1424 /* FALL THROUGH */ 1425 # endif 1426 case OLD_ENV_VALUE: 1427 /* 1428 * Although OLD_ENV_VALUE is not legal, we will 1429 * still recognize it, just in case it is an 1430 * old server that has VAR & VALUE mixed up... 1431 */ 1432 /* FALL THROUGH */ 1433 #else 1434 case NEW_ENV_VAR: 1435 #endif 1436 case ENV_USERVAR: 1437 if (ep) { 1438 *epc = 0; 1439 env_opt_add(ep); 1440 } 1441 ep = epc = &buf[i+1]; 1442 break; 1443 case ENV_ESC: 1444 i++; 1445 /*FALL THROUGH*/ 1446 default: 1447 if (epc) 1448 *epc++ = buf[i]; 1449 break; 1450 } 1451 } 1452 if (ep) { 1453 *epc = 0; 1454 env_opt_add(ep); 1455 } 1456 env_opt_end(1); 1457 break; 1458 1459 case TELQUAL_IS: 1460 case TELQUAL_INFO: 1461 /* Ignore for now. We shouldn't get it anyway. */ 1462 break; 1463 1464 default: 1465 break; 1466 } 1467 } 1468 1469 #define OPT_REPLY_SIZE (2 * SUBBUFSIZE) 1470 unsigned char *opt_reply = NULL; 1471 unsigned char *opt_replyp; 1472 unsigned char *opt_replyend; 1473 1474 void 1475 env_opt_start(void) 1476 { 1477 if (opt_reply) 1478 opt_reply = (unsigned char *)realloc(opt_reply, OPT_REPLY_SIZE); 1479 else 1480 opt_reply = (unsigned char *)malloc(OPT_REPLY_SIZE); 1481 if (opt_reply == NULL) { 1482 /*@*/ printf("env_opt_start: malloc()/realloc() failed!!!\n"); 1483 opt_reply = opt_replyp = opt_replyend = NULL; 1484 return; 1485 } 1486 opt_replyp = opt_reply; 1487 opt_replyend = opt_reply + OPT_REPLY_SIZE; 1488 *opt_replyp++ = IAC; 1489 *opt_replyp++ = SB; 1490 *opt_replyp++ = telopt_environ; 1491 *opt_replyp++ = TELQUAL_IS; 1492 } 1493 1494 void 1495 env_opt_start_info(void) 1496 { 1497 env_opt_start(); 1498 if (opt_replyp) 1499 opt_replyp[-1] = TELQUAL_INFO; 1500 } 1501 1502 void 1503 env_opt_add(unsigned char *ep) 1504 { 1505 unsigned char *vp, c; 1506 1507 if (opt_reply == NULL) /*XXX*/ 1508 return; /*XXX*/ 1509 1510 if (ep == NULL || *ep == '\0') { 1511 /* Send user defined variables first. */ 1512 env_default(1, 0); 1513 while ((ep = env_default(0, 0))) 1514 env_opt_add(ep); 1515 1516 /* Now add the list of well know variables. */ 1517 env_default(1, 1); 1518 while ((ep = env_default(0, 1))) 1519 env_opt_add(ep); 1520 return; 1521 } 1522 vp = env_getvalue(ep); 1523 if (opt_replyp + (vp ? 2 * strlen((char *)vp) : 0) + 1524 2 * strlen((char *)ep) + 6 > opt_replyend) 1525 { 1526 1527 int len; 1528 opt_replyend += OPT_REPLY_SIZE; 1529 len = opt_replyend - opt_reply; 1530 opt_reply = (unsigned char *)realloc(opt_reply, len); 1531 if (opt_reply == NULL) { 1532 /*@*/ printf("env_opt_add: realloc() failed!!!\n"); 1533 opt_reply = opt_replyp = opt_replyend = NULL; 1534 return; 1535 } 1536 opt_replyp = opt_reply + len - (opt_replyend - opt_replyp); 1537 opt_replyend = opt_reply + len; 1538 } 1539 if (opt_welldefined(ep)) 1540 #ifdef OLD_ENVIRON 1541 if (telopt_environ == TELOPT_OLD_ENVIRON) 1542 *opt_replyp++ = old_env_var; 1543 else 1544 #endif 1545 *opt_replyp++ = NEW_ENV_VAR; 1546 else 1547 *opt_replyp++ = ENV_USERVAR; 1548 for (;;) { 1549 while ((c = *ep++)) { 1550 if (opt_replyp + (2 + 2) > opt_replyend) 1551 return; 1552 switch(c&0xff) { 1553 case IAC: 1554 *opt_replyp++ = IAC; 1555 break; 1556 case NEW_ENV_VAR: 1557 case NEW_ENV_VALUE: 1558 case ENV_ESC: 1559 case ENV_USERVAR: 1560 *opt_replyp++ = ENV_ESC; 1561 break; 1562 } 1563 *opt_replyp++ = c; 1564 } 1565 if ((ep = vp)) { 1566 if (opt_replyp + (1 + 2 + 2) > opt_replyend) 1567 return; 1568 #ifdef OLD_ENVIRON 1569 if (telopt_environ == TELOPT_OLD_ENVIRON) 1570 *opt_replyp++ = old_env_value; 1571 else 1572 #endif 1573 *opt_replyp++ = NEW_ENV_VALUE; 1574 vp = NULL; 1575 } else 1576 break; 1577 } 1578 } 1579 1580 int 1581 opt_welldefined(const char *ep) 1582 { 1583 if ((strcmp(ep, "USER") == 0) || 1584 (strcmp(ep, "DISPLAY") == 0) || 1585 (strcmp(ep, "PRINTER") == 0) || 1586 (strcmp(ep, "SYSTEMTYPE") == 0) || 1587 (strcmp(ep, "JOB") == 0) || 1588 (strcmp(ep, "ACCT") == 0)) 1589 return(1); 1590 return(0); 1591 } 1592 1593 void 1594 env_opt_end(int emptyok) 1595 { 1596 int len; 1597 1598 if (opt_replyp + 2 > opt_replyend) 1599 return; 1600 len = opt_replyp + 2 - opt_reply; 1601 if (emptyok || len > 6) { 1602 *opt_replyp++ = IAC; 1603 *opt_replyp++ = SE; 1604 if (NETROOM() > len) { 1605 ring_supply_data(&netoring, opt_reply, len); 1606 printsub('>', &opt_reply[2], len - 2); 1607 } 1608 /*@*/ else printf("slc_end_reply: not enough room\n"); 1609 } 1610 if (opt_reply) { 1611 free(opt_reply); 1612 opt_reply = opt_replyp = opt_replyend = NULL; 1613 } 1614 } 1615 1616 1617 1618 int 1619 telrcv(void) 1620 { 1621 int c; 1622 int scc; 1623 unsigned char *sbp; 1624 int count; 1625 int returnValue = 0; 1626 1627 scc = 0; 1628 count = 0; 1629 while (TTYROOM() > 2) { 1630 if (scc == 0) { 1631 if (count) { 1632 ring_consumed(&netiring, count); 1633 returnValue = 1; 1634 count = 0; 1635 } 1636 sbp = netiring.consume; 1637 scc = ring_full_consecutive(&netiring); 1638 if (scc == 0) { 1639 /* No more data coming in */ 1640 break; 1641 } 1642 } 1643 1644 c = *sbp++ & 0xff, scc--; count++; 1645 #ifdef ENCRYPTION 1646 if (decrypt_input) 1647 c = (*decrypt_input)(c); 1648 #endif /* ENCRYPTION */ 1649 1650 switch (telrcv_state) { 1651 1652 case TS_CR: 1653 telrcv_state = TS_DATA; 1654 if (c == '\0') { 1655 break; /* Ignore \0 after CR */ 1656 } 1657 else if ((c == '\n') && my_want_state_is_dont(TELOPT_ECHO) && !crmod) { 1658 TTYADD(c); 1659 break; 1660 } 1661 /* Else, fall through */ 1662 1663 case TS_DATA: 1664 if (c == IAC) { 1665 telrcv_state = TS_IAC; 1666 break; 1667 } 1668 /* 1669 * The 'crmod' hack (see following) is needed 1670 * since we can't * set CRMOD on output only. 1671 * Machines like MULTICS like to send \r without 1672 * \n; since we must turn off CRMOD to get proper 1673 * input, the mapping is done here (sigh). 1674 */ 1675 if ((c == '\r') && my_want_state_is_dont(TELOPT_BINARY)) { 1676 if (scc > 0) { 1677 c = *sbp&0xff; 1678 #ifdef ENCRYPTION 1679 if (decrypt_input) 1680 c = (*decrypt_input)(c); 1681 #endif /* ENCRYPTION */ 1682 if (c == 0) { 1683 sbp++, scc--; count++; 1684 /* a "true" CR */ 1685 TTYADD('\r'); 1686 } else if (my_want_state_is_dont(TELOPT_ECHO) && 1687 (c == '\n')) { 1688 sbp++, scc--; count++; 1689 TTYADD('\n'); 1690 } else { 1691 #ifdef ENCRYPTION 1692 if (decrypt_input) 1693 (*decrypt_input)(-1); 1694 #endif /* ENCRYPTION */ 1695 1696 TTYADD('\r'); 1697 if (crmod) { 1698 TTYADD('\n'); 1699 } 1700 } 1701 } else { 1702 telrcv_state = TS_CR; 1703 TTYADD('\r'); 1704 if (crmod) { 1705 TTYADD('\n'); 1706 } 1707 } 1708 } else { 1709 TTYADD(c); 1710 } 1711 continue; 1712 1713 case TS_IAC: 1714 process_iac: 1715 switch (c) { 1716 1717 case WILL: 1718 telrcv_state = TS_WILL; 1719 continue; 1720 1721 case WONT: 1722 telrcv_state = TS_WONT; 1723 continue; 1724 1725 case DO: 1726 telrcv_state = TS_DO; 1727 continue; 1728 1729 case DONT: 1730 telrcv_state = TS_DONT; 1731 continue; 1732 1733 case DM: 1734 /* 1735 * We may have missed an urgent notification, 1736 * so make sure we flush whatever is in the 1737 * buffer currently. 1738 */ 1739 printoption("RCVD", IAC, DM); 1740 SYNCHing = 1; 1741 (void) ttyflush(1); 1742 SYNCHing = stilloob(); 1743 settimer(gotDM); 1744 break; 1745 1746 case SB: 1747 SB_CLEAR(); 1748 telrcv_state = TS_SB; 1749 continue; 1750 1751 case IAC: 1752 TTYADD(IAC); 1753 break; 1754 1755 case NOP: 1756 case GA: 1757 default: 1758 printoption("RCVD", IAC, c); 1759 break; 1760 } 1761 telrcv_state = TS_DATA; 1762 continue; 1763 1764 case TS_WILL: 1765 printoption("RCVD", WILL, c); 1766 willoption(c); 1767 telrcv_state = TS_DATA; 1768 continue; 1769 1770 case TS_WONT: 1771 printoption("RCVD", WONT, c); 1772 wontoption(c); 1773 telrcv_state = TS_DATA; 1774 continue; 1775 1776 case TS_DO: 1777 printoption("RCVD", DO, c); 1778 dooption(c); 1779 if (c == TELOPT_NAWS) { 1780 sendnaws(); 1781 } else if (c == TELOPT_LFLOW) { 1782 localflow = 1; 1783 setcommandmode(); 1784 setconnmode(0); 1785 } 1786 telrcv_state = TS_DATA; 1787 continue; 1788 1789 case TS_DONT: 1790 printoption("RCVD", DONT, c); 1791 dontoption(c); 1792 flushline = 1; 1793 setconnmode(0); /* set new tty mode (maybe) */ 1794 telrcv_state = TS_DATA; 1795 continue; 1796 1797 case TS_SB: 1798 if (c == IAC) { 1799 telrcv_state = TS_SE; 1800 } else { 1801 SB_ACCUM(c); 1802 } 1803 continue; 1804 1805 case TS_SE: 1806 if (c != SE) { 1807 if (c != IAC) { 1808 /* 1809 * This is an error. We only expect to get 1810 * "IAC IAC" or "IAC SE". Several things may 1811 * have happend. An IAC was not doubled, the 1812 * IAC SE was left off, or another option got 1813 * inserted into the suboption are all possibilities. 1814 * If we assume that the IAC was not doubled, 1815 * and really the IAC SE was left off, we could 1816 * get into an infinate loop here. So, instead, 1817 * we terminate the suboption, and process the 1818 * partial suboption if we can. 1819 */ 1820 SB_ACCUM(IAC); 1821 SB_ACCUM(c); 1822 subpointer -= 2; 1823 SB_TERM(); 1824 1825 printoption("In SUBOPTION processing, RCVD", IAC, c); 1826 suboption(); /* handle sub-option */ 1827 telrcv_state = TS_IAC; 1828 goto process_iac; 1829 } 1830 SB_ACCUM(c); 1831 telrcv_state = TS_SB; 1832 } else { 1833 SB_ACCUM(IAC); 1834 SB_ACCUM(SE); 1835 subpointer -= 2; 1836 SB_TERM(); 1837 suboption(); /* handle sub-option */ 1838 telrcv_state = TS_DATA; 1839 } 1840 } 1841 } 1842 if (count) 1843 ring_consumed(&netiring, count); 1844 return returnValue||count; 1845 } 1846 1847 static int bol = 1, local = 0; 1848 1849 int 1850 rlogin_susp(void) 1851 { 1852 if (local) { 1853 local = 0; 1854 bol = 1; 1855 command(0, "z\n", 2); 1856 return(1); 1857 } 1858 return(0); 1859 } 1860 1861 static int 1862 telsnd(void) 1863 { 1864 int tcc; 1865 int count; 1866 int returnValue = 0; 1867 unsigned char *tbp; 1868 1869 tcc = 0; 1870 count = 0; 1871 while (NETROOM() > 2) { 1872 int sc; 1873 int c; 1874 1875 if (tcc == 0) { 1876 if (count) { 1877 ring_consumed(&ttyiring, count); 1878 returnValue = 1; 1879 count = 0; 1880 } 1881 tbp = ttyiring.consume; 1882 tcc = ring_full_consecutive(&ttyiring); 1883 if (tcc == 0) { 1884 break; 1885 } 1886 } 1887 c = *tbp++ & 0xff, sc = strip(c), tcc--; count++; 1888 if (rlogin != _POSIX_VDISABLE) { 1889 if (bol) { 1890 bol = 0; 1891 if (sc == rlogin) { 1892 local = 1; 1893 continue; 1894 } 1895 } else if (local) { 1896 local = 0; 1897 if (sc == '.' || c == termEofChar) { 1898 bol = 1; 1899 command(0, "close\n", 6); 1900 continue; 1901 } 1902 if (sc == termSuspChar) { 1903 bol = 1; 1904 command(0, "z\n", 2); 1905 continue; 1906 } 1907 if (sc == escape) { 1908 command(0, tbp, tcc); 1909 bol = 1; 1910 count += tcc; 1911 tcc = 0; 1912 flushline = 1; 1913 break; 1914 } 1915 if (sc != rlogin) { 1916 ++tcc; 1917 --tbp; 1918 --count; 1919 c = sc = rlogin; 1920 } 1921 } 1922 if ((sc == '\n') || (sc == '\r')) 1923 bol = 1; 1924 } else if (escape != _POSIX_VDISABLE && sc == escape) { 1925 /* 1926 * Double escape is a pass through of a single escape character. 1927 */ 1928 if (tcc && strip(*tbp) == escape) { 1929 tbp++; 1930 tcc--; 1931 count++; 1932 bol = 0; 1933 } else { 1934 command(0, (char *)tbp, tcc); 1935 bol = 1; 1936 count += tcc; 1937 tcc = 0; 1938 flushline = 1; 1939 break; 1940 } 1941 } else 1942 bol = 0; 1943 #ifdef KLUDGELINEMODE 1944 if (kludgelinemode && (globalmode&MODE_EDIT) && (sc == echoc)) { 1945 if (tcc > 0 && strip(*tbp) == echoc) { 1946 tcc--; tbp++; count++; 1947 } else { 1948 dontlecho = !dontlecho; 1949 settimer(echotoggle); 1950 setconnmode(0); 1951 flushline = 1; 1952 break; 1953 } 1954 } 1955 #endif 1956 if (MODE_LOCAL_CHARS(globalmode)) { 1957 if (TerminalSpecialChars(sc) == 0) { 1958 bol = 1; 1959 break; 1960 } 1961 } 1962 if (my_want_state_is_wont(TELOPT_BINARY)) { 1963 switch (c) { 1964 case '\n': 1965 /* 1966 * If we are in CRMOD mode (\r ==> \n) 1967 * on our local machine, then probably 1968 * a newline (unix) is CRLF (TELNET). 1969 */ 1970 if (MODE_LOCAL_CHARS(globalmode)) { 1971 NETADD('\r'); 1972 } 1973 NETADD('\n'); 1974 bol = flushline = 1; 1975 break; 1976 case '\r': 1977 if (!crlf) { 1978 NET2ADD('\r', '\0'); 1979 } else { 1980 NET2ADD('\r', '\n'); 1981 } 1982 bol = flushline = 1; 1983 break; 1984 case IAC: 1985 NET2ADD(IAC, IAC); 1986 break; 1987 default: 1988 NETADD(c); 1989 break; 1990 } 1991 } else if (c == IAC) { 1992 NET2ADD(IAC, IAC); 1993 } else { 1994 NETADD(c); 1995 } 1996 } 1997 if (count) 1998 ring_consumed(&ttyiring, count); 1999 return returnValue||count; /* Non-zero if we did anything */ 2000 } 2001 2002 /* 2003 * Scheduler() 2004 * 2005 * Try to do something. 2006 * 2007 * If we do something useful, return 1; else return 0. 2008 * 2009 */ 2010 2011 static int 2012 Scheduler(int block) 2013 { 2014 /* One wants to be a bit careful about setting returnValue 2015 * to one, since a one implies we did some useful work, 2016 * and therefore probably won't be called to block next 2017 */ 2018 int returnValue; 2019 int netin, netout, netex, ttyin, ttyout; 2020 2021 /* Decide which rings should be processed */ 2022 2023 netout = ring_full_count(&netoring) && 2024 (flushline || 2025 (my_want_state_is_wont(TELOPT_LINEMODE) 2026 #ifdef KLUDGELINEMODE 2027 && (!kludgelinemode || my_want_state_is_do(TELOPT_SGA)) 2028 #endif 2029 ) || 2030 my_want_state_is_will(TELOPT_BINARY)); 2031 ttyout = ring_full_count(&ttyoring); 2032 2033 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0); 2034 2035 netin = !ISend && ring_empty_count(&netiring); 2036 2037 netex = !SYNCHing; 2038 2039 /* Call to system code to process rings */ 2040 2041 returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block); 2042 2043 /* Now, look at the input rings, looking for work to do. */ 2044 2045 if (ring_full_count(&ttyiring)) { 2046 returnValue |= telsnd(); 2047 } 2048 2049 if (ring_full_count(&netiring)) { 2050 returnValue |= telrcv(); 2051 } 2052 return returnValue; 2053 } 2054 2055 #ifdef AUTHENTICATION 2056 #define __unusedhere 2057 #else 2058 #define __unusedhere __unused 2059 #endif 2060 /* 2061 * Select from tty and network... 2062 */ 2063 void 2064 telnet(char *user __unusedhere) 2065 { 2066 sys_telnet_init(); 2067 2068 #ifdef AUTHENTICATION 2069 #ifdef ENCRYPTION 2070 { 2071 static char local_host[256] = { 0 }; 2072 2073 if (!local_host[0]) { 2074 gethostname(local_host, sizeof(local_host)); 2075 local_host[sizeof(local_host)-1] = 0; 2076 } 2077 auth_encrypt_init(local_host, hostname, "TELNET", 0); 2078 auth_encrypt_user(user); 2079 } 2080 #endif 2081 #endif 2082 if (telnetport) { 2083 #ifdef AUTHENTICATION 2084 if (autologin) 2085 send_will(TELOPT_AUTHENTICATION, 1); 2086 #endif 2087 #ifdef ENCRYPTION 2088 send_do(TELOPT_ENCRYPT, 1); 2089 send_will(TELOPT_ENCRYPT, 1); 2090 #endif /* ENCRYPTION */ 2091 send_do(TELOPT_SGA, 1); 2092 send_will(TELOPT_TTYPE, 1); 2093 send_will(TELOPT_NAWS, 1); 2094 send_will(TELOPT_TSPEED, 1); 2095 send_will(TELOPT_LFLOW, 1); 2096 send_will(TELOPT_LINEMODE, 1); 2097 send_will(TELOPT_NEW_ENVIRON, 1); 2098 send_do(TELOPT_STATUS, 1); 2099 if (env_getvalue("DISPLAY")) 2100 send_will(TELOPT_XDISPLOC, 1); 2101 if (eight) 2102 tel_enter_binary(eight); 2103 } 2104 2105 for (;;) { 2106 int schedValue; 2107 2108 while ((schedValue = Scheduler(0)) != 0) { 2109 if (schedValue == -1) { 2110 setcommandmode(); 2111 return; 2112 } 2113 } 2114 2115 if (Scheduler(1) == -1) { 2116 setcommandmode(); 2117 return; 2118 } 2119 } 2120 } 2121 2122 #if 0 /* XXX - this not being in is a bug */ 2123 /* 2124 * nextitem() 2125 * 2126 * Return the address of the next "item" in the TELNET data 2127 * stream. This will be the address of the next character if 2128 * the current address is a user data character, or it will 2129 * be the address of the character following the TELNET command 2130 * if the current address is a TELNET IAC ("I Am a Command") 2131 * character. 2132 */ 2133 2134 static char * 2135 nextitem(char *current) 2136 { 2137 if ((*current&0xff) != IAC) { 2138 return current+1; 2139 } 2140 switch (*(current+1)&0xff) { 2141 case DO: 2142 case DONT: 2143 case WILL: 2144 case WONT: 2145 return current+3; 2146 case SB: /* loop forever looking for the SE */ 2147 { 2148 char *look = current+2; 2149 2150 for (;;) { 2151 if ((*look++&0xff) == IAC) { 2152 if ((*look++&0xff) == SE) { 2153 return look; 2154 } 2155 } 2156 } 2157 } 2158 default: 2159 return current+2; 2160 } 2161 } 2162 #endif /* 0 */ 2163 2164 /* 2165 * netclear() 2166 * 2167 * We are about to do a TELNET SYNCH operation. Clear 2168 * the path to the network. 2169 * 2170 * Things are a bit tricky since we may have sent the first 2171 * byte or so of a previous TELNET command into the network. 2172 * So, we have to scan the network buffer from the beginning 2173 * until we are up to where we want to be. 2174 * 2175 * A side effect of what we do, just to keep things 2176 * simple, is to clear the urgent data pointer. The principal 2177 * caller should be setting the urgent data pointer AFTER calling 2178 * us in any case. 2179 */ 2180 2181 static void 2182 netclear(void) 2183 { 2184 /* Deleted */ 2185 } 2186 2187 /* 2188 * These routines add various telnet commands to the data stream. 2189 */ 2190 2191 static void 2192 doflush(void) 2193 { 2194 NET2ADD(IAC, DO); 2195 NETADD(TELOPT_TM); 2196 flushline = 1; 2197 flushout = 1; 2198 (void) ttyflush(1); /* Flush/drop output */ 2199 /* do printoption AFTER flush, otherwise the output gets tossed... */ 2200 printoption("SENT", DO, TELOPT_TM); 2201 } 2202 2203 void 2204 xmitAO(void) 2205 { 2206 NET2ADD(IAC, AO); 2207 printoption("SENT", IAC, AO); 2208 if (autoflush) { 2209 doflush(); 2210 } 2211 } 2212 2213 void 2214 xmitEL(void) 2215 { 2216 NET2ADD(IAC, EL); 2217 printoption("SENT", IAC, EL); 2218 } 2219 2220 void 2221 xmitEC(void) 2222 { 2223 NET2ADD(IAC, EC); 2224 printoption("SENT", IAC, EC); 2225 } 2226 2227 int 2228 dosynch(char *ch __unused) 2229 { 2230 netclear(); /* clear the path to the network */ 2231 NETADD(IAC); 2232 setneturg(); 2233 NETADD(DM); 2234 printoption("SENT", IAC, DM); 2235 return 1; 2236 } 2237 2238 int want_status_response = 0; 2239 2240 int 2241 get_status(char *ch __unused) 2242 { 2243 unsigned char tmp[16]; 2244 unsigned char *cp; 2245 2246 if (my_want_state_is_dont(TELOPT_STATUS)) { 2247 printf("Remote side does not support STATUS option\n"); 2248 return 0; 2249 } 2250 cp = tmp; 2251 2252 *cp++ = IAC; 2253 *cp++ = SB; 2254 *cp++ = TELOPT_STATUS; 2255 *cp++ = TELQUAL_SEND; 2256 *cp++ = IAC; 2257 *cp++ = SE; 2258 if (NETROOM() >= cp - tmp) { 2259 ring_supply_data(&netoring, tmp, cp-tmp); 2260 printsub('>', tmp+2, cp - tmp - 2); 2261 } 2262 ++want_status_response; 2263 return 1; 2264 } 2265 2266 void 2267 intp(void) 2268 { 2269 NET2ADD(IAC, IP); 2270 printoption("SENT", IAC, IP); 2271 flushline = 1; 2272 if (autoflush) { 2273 doflush(); 2274 } 2275 if (autosynch) { 2276 dosynch(NULL); 2277 } 2278 } 2279 2280 void 2281 sendbrk(void) 2282 { 2283 NET2ADD(IAC, BREAK); 2284 printoption("SENT", IAC, BREAK); 2285 flushline = 1; 2286 if (autoflush) { 2287 doflush(); 2288 } 2289 if (autosynch) { 2290 dosynch(NULL); 2291 } 2292 } 2293 2294 void 2295 sendabort(void) 2296 { 2297 NET2ADD(IAC, ABORT); 2298 printoption("SENT", IAC, ABORT); 2299 flushline = 1; 2300 if (autoflush) { 2301 doflush(); 2302 } 2303 if (autosynch) { 2304 dosynch(NULL); 2305 } 2306 } 2307 2308 void 2309 sendsusp(void) 2310 { 2311 NET2ADD(IAC, SUSP); 2312 printoption("SENT", IAC, SUSP); 2313 flushline = 1; 2314 if (autoflush) { 2315 doflush(); 2316 } 2317 if (autosynch) { 2318 dosynch(NULL); 2319 } 2320 } 2321 2322 void 2323 sendeof(void) 2324 { 2325 NET2ADD(IAC, xEOF); 2326 printoption("SENT", IAC, xEOF); 2327 } 2328 2329 void 2330 sendayt(void) 2331 { 2332 NET2ADD(IAC, AYT); 2333 printoption("SENT", IAC, AYT); 2334 } 2335 2336 /* 2337 * Send a window size update to the remote system. 2338 */ 2339 2340 void 2341 sendnaws(void) 2342 { 2343 long rows, cols; 2344 unsigned char tmp[16]; 2345 unsigned char *cp; 2346 2347 if (my_state_is_wont(TELOPT_NAWS)) 2348 return; 2349 2350 #define PUTSHORT(cp, x) { if ((*cp++ = ((x)>>8)&0xff) == IAC) *cp++ = IAC; \ 2351 if ((*cp++ = ((x))&0xff) == IAC) *cp++ = IAC; } 2352 2353 if (TerminalWindowSize(&rows, &cols) == 0) { /* Failed */ 2354 return; 2355 } 2356 2357 cp = tmp; 2358 2359 *cp++ = IAC; 2360 *cp++ = SB; 2361 *cp++ = TELOPT_NAWS; 2362 PUTSHORT(cp, cols); 2363 PUTSHORT(cp, rows); 2364 *cp++ = IAC; 2365 *cp++ = SE; 2366 if (NETROOM() >= cp - tmp) { 2367 ring_supply_data(&netoring, tmp, cp-tmp); 2368 printsub('>', tmp+2, cp - tmp - 2); 2369 } 2370 } 2371 2372 void 2373 tel_enter_binary(int rw) 2374 { 2375 if (rw&1) 2376 send_do(TELOPT_BINARY, 1); 2377 if (rw&2) 2378 send_will(TELOPT_BINARY, 1); 2379 } 2380 2381 void 2382 tel_leave_binary(int rw) 2383 { 2384 if (rw&1) 2385 send_dont(TELOPT_BINARY, 1); 2386 if (rw&2) 2387 send_wont(TELOPT_BINARY, 1); 2388 } 2389