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 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; /* 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 sprintf(temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE, 736 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 sprintf((char *)temp, "%c%c%c%c%ld,%ld%c%c", IAC, SB, TELOPT_TSPEED, 758 TELQUAL_IS, ospeed, ispeed, IAC, SE); 759 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 760 761 if (len < NETROOM()) { 762 ring_supply_data(&netoring, temp, len); 763 printsub('>', temp+2, len - 2); 764 } 765 /*@*/ else printf("lm_will: not enough room in buffer\n"); 766 } 767 break; 768 case TELOPT_LFLOW: 769 if (my_want_state_is_wont(TELOPT_LFLOW)) 770 return; 771 if (SB_EOF()) 772 return; 773 switch(SB_GET()) { 774 case LFLOW_RESTART_ANY: 775 restartany = 1; 776 break; 777 case LFLOW_RESTART_XON: 778 restartany = 0; 779 break; 780 case LFLOW_ON: 781 localflow = 1; 782 break; 783 case LFLOW_OFF: 784 localflow = 0; 785 break; 786 default: 787 return; 788 } 789 setcommandmode(); 790 setconnmode(0); 791 break; 792 793 case TELOPT_LINEMODE: 794 if (my_want_state_is_wont(TELOPT_LINEMODE)) 795 return; 796 if (SB_EOF()) 797 return; 798 switch (SB_GET()) { 799 case WILL: 800 lm_will(subpointer, SB_LEN()); 801 break; 802 case WONT: 803 lm_wont(subpointer, SB_LEN()); 804 break; 805 case DO: 806 lm_do(subpointer, SB_LEN()); 807 break; 808 case DONT: 809 lm_dont(subpointer, SB_LEN()); 810 break; 811 case LM_SLC: 812 slc(subpointer, SB_LEN()); 813 break; 814 case LM_MODE: 815 lm_mode(subpointer, SB_LEN(), 0); 816 break; 817 default: 818 break; 819 } 820 break; 821 822 #ifdef OLD_ENVIRON 823 case TELOPT_OLD_ENVIRON: 824 #endif 825 case TELOPT_NEW_ENVIRON: 826 if (SB_EOF()) 827 return; 828 switch(SB_PEEK()) { 829 case TELQUAL_IS: 830 case TELQUAL_INFO: 831 if (my_want_state_is_dont(subchar)) 832 return; 833 break; 834 case TELQUAL_SEND: 835 if (my_want_state_is_wont(subchar)) { 836 return; 837 } 838 break; 839 default: 840 return; 841 } 842 env_opt(subpointer, SB_LEN()); 843 break; 844 845 case TELOPT_XDISPLOC: 846 if (my_want_state_is_wont(TELOPT_XDISPLOC)) 847 return; 848 if (SB_EOF()) 849 return; 850 if (SB_GET() == TELQUAL_SEND) { 851 unsigned char temp[50], *dp; 852 int len; 853 854 if ((dp = env_getvalue("DISPLAY")) == NULL || 855 strlen(dp) > sizeof(temp) - 7) { 856 /* 857 * Something happened, we no longer have a DISPLAY 858 * variable. Or it is too long. So, turn off the option. 859 */ 860 send_wont(TELOPT_XDISPLOC, 1); 861 break; 862 } 863 snprintf(temp, sizeof(temp), "%c%c%c%c%s%c%c", IAC, SB, 864 TELOPT_XDISPLOC, TELQUAL_IS, dp, IAC, SE); 865 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 866 867 if (len < NETROOM()) { 868 ring_supply_data(&netoring, temp, len); 869 printsub('>', temp+2, len - 2); 870 } 871 /*@*/ else printf("lm_will: not enough room in buffer\n"); 872 } 873 break; 874 875 #ifdef AUTHENTICATION 876 case TELOPT_AUTHENTICATION: { 877 if (!autologin) 878 break; 879 if (SB_EOF()) 880 return; 881 switch(SB_GET()) { 882 case TELQUAL_IS: 883 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 884 return; 885 auth_is(subpointer, SB_LEN()); 886 break; 887 case TELQUAL_SEND: 888 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 889 return; 890 auth_send(subpointer, SB_LEN()); 891 break; 892 case TELQUAL_REPLY: 893 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 894 return; 895 auth_reply(subpointer, SB_LEN()); 896 break; 897 case TELQUAL_NAME: 898 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 899 return; 900 auth_name(subpointer, SB_LEN()); 901 break; 902 } 903 } 904 break; 905 #endif 906 #ifdef ENCRYPTION 907 case TELOPT_ENCRYPT: 908 if (SB_EOF()) 909 return; 910 switch(SB_GET()) { 911 case ENCRYPT_START: 912 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 913 return; 914 encrypt_start(subpointer, SB_LEN()); 915 break; 916 case ENCRYPT_END: 917 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 918 return; 919 encrypt_end(); 920 break; 921 case ENCRYPT_SUPPORT: 922 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 923 return; 924 encrypt_support(subpointer, SB_LEN()); 925 break; 926 case ENCRYPT_REQSTART: 927 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 928 return; 929 encrypt_request_start(subpointer, SB_LEN()); 930 break; 931 case ENCRYPT_REQEND: 932 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 933 return; 934 /* 935 * We can always send an REQEND so that we cannot 936 * get stuck encrypting. We should only get this 937 * if we have been able to get in the correct mode 938 * anyhow. 939 */ 940 encrypt_request_end(); 941 break; 942 case ENCRYPT_IS: 943 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 944 return; 945 encrypt_is(subpointer, SB_LEN()); 946 break; 947 case ENCRYPT_REPLY: 948 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 949 return; 950 encrypt_reply(subpointer, SB_LEN()); 951 break; 952 case ENCRYPT_ENC_KEYID: 953 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 954 return; 955 encrypt_enc_keyid(subpointer, SB_LEN()); 956 break; 957 case ENCRYPT_DEC_KEYID: 958 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 959 return; 960 encrypt_dec_keyid(subpointer, SB_LEN()); 961 break; 962 default: 963 break; 964 } 965 break; 966 #endif /* ENCRYPTION */ 967 default: 968 break; 969 } 970 } 971 972 static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE }; 973 974 void 975 lm_will(unsigned char *cmd, int len) 976 { 977 if (len < 1) { 978 /*@*/ printf("lm_will: no command!!!\n"); /* Should not happen... */ 979 return; 980 } 981 switch(cmd[0]) { 982 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 983 default: 984 str_lm[3] = DONT; 985 str_lm[4] = cmd[0]; 986 if (NETROOM() > (int)sizeof(str_lm)) { 987 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 988 printsub('>', &str_lm[2], sizeof(str_lm)-2); 989 } 990 /*@*/ else printf("lm_will: not enough room in buffer\n"); 991 break; 992 } 993 } 994 995 void 996 lm_wont(unsigned char *cmd, int len) 997 { 998 if (len < 1) { 999 /*@*/ printf("lm_wont: no command!!!\n"); /* Should not happen... */ 1000 return; 1001 } 1002 switch(cmd[0]) { 1003 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 1004 default: 1005 /* We are always DONT, so don't respond */ 1006 return; 1007 } 1008 } 1009 1010 void 1011 lm_do(unsigned char *cmd, int len) 1012 { 1013 if (len < 1) { 1014 /*@*/ printf("lm_do: no command!!!\n"); /* Should not happen... */ 1015 return; 1016 } 1017 switch(cmd[0]) { 1018 case LM_FORWARDMASK: 1019 default: 1020 str_lm[3] = WONT; 1021 str_lm[4] = cmd[0]; 1022 if (NETROOM() > (int)sizeof(str_lm)) { 1023 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 1024 printsub('>', &str_lm[2], sizeof(str_lm)-2); 1025 } 1026 /*@*/ else printf("lm_do: not enough room in buffer\n"); 1027 break; 1028 } 1029 } 1030 1031 void 1032 lm_dont(unsigned char *cmd, int len) 1033 { 1034 if (len < 1) { 1035 /*@*/ printf("lm_dont: no command!!!\n"); /* Should not happen... */ 1036 return; 1037 } 1038 switch(cmd[0]) { 1039 case LM_FORWARDMASK: 1040 default: 1041 /* we are always WONT, so don't respond */ 1042 break; 1043 } 1044 } 1045 1046 static unsigned char str_lm_mode[] = { 1047 IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE 1048 }; 1049 1050 void 1051 lm_mode(unsigned char *cmd, int len, int init) 1052 { 1053 if (len != 1) 1054 return; 1055 if ((linemode&MODE_MASK&~MODE_ACK) == *cmd) 1056 return; 1057 if (*cmd&MODE_ACK) 1058 return; 1059 linemode = *cmd&(MODE_MASK&~MODE_ACK); 1060 str_lm_mode[4] = linemode; 1061 if (!init) 1062 str_lm_mode[4] |= MODE_ACK; 1063 if (NETROOM() > (int)sizeof(str_lm_mode)) { 1064 ring_supply_data(&netoring, str_lm_mode, sizeof(str_lm_mode)); 1065 printsub('>', &str_lm_mode[2], sizeof(str_lm_mode)-2); 1066 } 1067 /*@*/ else printf("lm_mode: not enough room in buffer\n"); 1068 setconnmode(0); /* set changed mode */ 1069 } 1070 1071 1072 1073 /* 1074 * slc() 1075 * Handle special character suboption of LINEMODE. 1076 */ 1077 1078 struct spc { 1079 cc_t val; 1080 cc_t *valp; 1081 char flags; /* Current flags & level */ 1082 char mylevel; /* Maximum level & flags */ 1083 } spc_data[NSLC+1]; 1084 1085 #define SLC_IMPORT 0 1086 #define SLC_EXPORT 1 1087 #define SLC_RVALUE 2 1088 static int slc_mode = SLC_EXPORT; 1089 1090 void 1091 slc_init(void) 1092 { 1093 struct spc *spcp; 1094 1095 localchars = 1; 1096 for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) { 1097 spcp->val = 0; 1098 spcp->valp = NULL; 1099 spcp->flags = spcp->mylevel = SLC_NOSUPPORT; 1100 } 1101 1102 #define initfunc(func, flags) { \ 1103 spcp = &spc_data[func]; \ 1104 if ((spcp->valp = tcval(func))) { \ 1105 spcp->val = *spcp->valp; \ 1106 spcp->mylevel = SLC_VARIABLE|flags; \ 1107 } else { \ 1108 spcp->val = 0; \ 1109 spcp->mylevel = SLC_DEFAULT; \ 1110 } \ 1111 } 1112 1113 initfunc(SLC_SYNCH, 0); 1114 /* No BRK */ 1115 initfunc(SLC_AO, 0); 1116 initfunc(SLC_AYT, 0); 1117 /* No EOR */ 1118 initfunc(SLC_ABORT, SLC_FLUSHIN|SLC_FLUSHOUT); 1119 initfunc(SLC_EOF, 0); 1120 #ifndef SYSV_TERMIO 1121 initfunc(SLC_SUSP, SLC_FLUSHIN); 1122 #endif 1123 initfunc(SLC_EC, 0); 1124 initfunc(SLC_EL, 0); 1125 #ifndef SYSV_TERMIO 1126 initfunc(SLC_EW, 0); 1127 initfunc(SLC_RP, 0); 1128 initfunc(SLC_LNEXT, 0); 1129 #endif 1130 initfunc(SLC_XON, 0); 1131 initfunc(SLC_XOFF, 0); 1132 #ifdef SYSV_TERMIO 1133 spc_data[SLC_XON].mylevel = SLC_CANTCHANGE; 1134 spc_data[SLC_XOFF].mylevel = SLC_CANTCHANGE; 1135 #endif 1136 initfunc(SLC_FORW1, 0); 1137 #ifdef USE_TERMIO 1138 initfunc(SLC_FORW2, 0); 1139 /* No FORW2 */ 1140 #endif 1141 1142 initfunc(SLC_IP, SLC_FLUSHIN|SLC_FLUSHOUT); 1143 #undef initfunc 1144 1145 if (slc_mode == SLC_EXPORT) 1146 slc_export(); 1147 else 1148 slc_import(1); 1149 1150 } 1151 1152 void 1153 slcstate(void) 1154 { 1155 printf("Special characters are %s values\n", 1156 slc_mode == SLC_IMPORT ? "remote default" : 1157 slc_mode == SLC_EXPORT ? "local" : 1158 "remote"); 1159 } 1160 1161 void 1162 slc_mode_export(void) 1163 { 1164 slc_mode = SLC_EXPORT; 1165 if (my_state_is_will(TELOPT_LINEMODE)) 1166 slc_export(); 1167 } 1168 1169 void 1170 slc_mode_import(int def) 1171 { 1172 slc_mode = def ? SLC_IMPORT : SLC_RVALUE; 1173 if (my_state_is_will(TELOPT_LINEMODE)) 1174 slc_import(def); 1175 } 1176 1177 unsigned char slc_import_val[] = { 1178 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE 1179 }; 1180 unsigned char slc_import_def[] = { 1181 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE 1182 }; 1183 1184 void 1185 slc_import(int def) 1186 { 1187 if (NETROOM() > (int)sizeof(slc_import_val)) { 1188 if (def) { 1189 ring_supply_data(&netoring, slc_import_def, sizeof(slc_import_def)); 1190 printsub('>', &slc_import_def[2], sizeof(slc_import_def)-2); 1191 } else { 1192 ring_supply_data(&netoring, slc_import_val, sizeof(slc_import_val)); 1193 printsub('>', &slc_import_val[2], sizeof(slc_import_val)-2); 1194 } 1195 } 1196 /*@*/ else printf("slc_import: not enough room\n"); 1197 } 1198 1199 void 1200 slc_export(void) 1201 { 1202 struct spc *spcp; 1203 1204 TerminalDefaultChars(); 1205 1206 slc_start_reply(); 1207 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1208 if (spcp->mylevel != SLC_NOSUPPORT) { 1209 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1210 spcp->flags = SLC_NOSUPPORT; 1211 else 1212 spcp->flags = spcp->mylevel; 1213 if (spcp->valp) 1214 spcp->val = *spcp->valp; 1215 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1216 } 1217 } 1218 slc_end_reply(); 1219 (void)slc_update(); 1220 setconnmode(1); /* Make sure the character values are set */ 1221 } 1222 1223 void 1224 slc(unsigned char *cp, int len) 1225 { 1226 struct spc *spcp; 1227 int func,level; 1228 1229 slc_start_reply(); 1230 1231 for (; len >= 3; len -=3, cp +=3) { 1232 1233 func = cp[SLC_FUNC]; 1234 1235 if (func == 0) { 1236 /* 1237 * Client side: always ignore 0 function. 1238 */ 1239 continue; 1240 } 1241 if (func > NSLC) { 1242 if ((cp[SLC_FLAGS] & SLC_LEVELBITS) != SLC_NOSUPPORT) 1243 slc_add_reply(func, SLC_NOSUPPORT, 0); 1244 continue; 1245 } 1246 1247 spcp = &spc_data[func]; 1248 1249 level = cp[SLC_FLAGS]&(SLC_LEVELBITS|SLC_ACK); 1250 1251 if ((cp[SLC_VALUE] == (unsigned char)spcp->val) && 1252 ((level&SLC_LEVELBITS) == (spcp->flags&SLC_LEVELBITS))) { 1253 continue; 1254 } 1255 1256 if (level == (SLC_DEFAULT|SLC_ACK)) { 1257 /* 1258 * This is an error condition, the SLC_ACK 1259 * bit should never be set for the SLC_DEFAULT 1260 * level. Our best guess to recover is to 1261 * ignore the SLC_ACK bit. 1262 */ 1263 cp[SLC_FLAGS] &= ~SLC_ACK; 1264 } 1265 1266 if (level == ((spcp->flags&SLC_LEVELBITS)|SLC_ACK)) { 1267 spcp->val = (cc_t)cp[SLC_VALUE]; 1268 spcp->flags = cp[SLC_FLAGS]; /* include SLC_ACK */ 1269 continue; 1270 } 1271 1272 level &= ~SLC_ACK; 1273 1274 if (level <= (spcp->mylevel&SLC_LEVELBITS)) { 1275 spcp->flags = cp[SLC_FLAGS]|SLC_ACK; 1276 spcp->val = (cc_t)cp[SLC_VALUE]; 1277 } 1278 if (level == SLC_DEFAULT) { 1279 if ((spcp->mylevel&SLC_LEVELBITS) != SLC_DEFAULT) 1280 spcp->flags = spcp->mylevel; 1281 else 1282 spcp->flags = SLC_NOSUPPORT; 1283 } 1284 slc_add_reply(func, spcp->flags, spcp->val); 1285 } 1286 slc_end_reply(); 1287 if (slc_update()) 1288 setconnmode(1); /* set the new character values */ 1289 } 1290 1291 void 1292 slc_check(void) 1293 { 1294 struct spc *spcp; 1295 1296 slc_start_reply(); 1297 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1298 if (spcp->valp && spcp->val != *spcp->valp) { 1299 spcp->val = *spcp->valp; 1300 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1301 spcp->flags = SLC_NOSUPPORT; 1302 else 1303 spcp->flags = spcp->mylevel; 1304 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1305 } 1306 } 1307 slc_end_reply(); 1308 setconnmode(1); 1309 } 1310 1311 unsigned char slc_reply[128]; 1312 unsigned char const * const slc_reply_eom = &slc_reply[sizeof(slc_reply)]; 1313 unsigned char *slc_replyp; 1314 1315 void 1316 slc_start_reply(void) 1317 { 1318 slc_replyp = slc_reply; 1319 *slc_replyp++ = IAC; 1320 *slc_replyp++ = SB; 1321 *slc_replyp++ = TELOPT_LINEMODE; 1322 *slc_replyp++ = LM_SLC; 1323 } 1324 1325 void 1326 slc_add_reply(unsigned char func, unsigned char flags, cc_t value) 1327 { 1328 /* A sequence of up to 6 bytes my be written for this member of the SLC 1329 * suboption list by this function. The end of negotiation command, 1330 * which is written by slc_end_reply(), will require 2 additional 1331 * bytes. Do not proceed unless there is sufficient space for these 1332 * items. 1333 */ 1334 if (&slc_replyp[6+2] > slc_reply_eom) 1335 return; 1336 if ((*slc_replyp++ = func) == IAC) 1337 *slc_replyp++ = IAC; 1338 if ((*slc_replyp++ = flags) == IAC) 1339 *slc_replyp++ = IAC; 1340 if ((*slc_replyp++ = (unsigned char)value) == IAC) 1341 *slc_replyp++ = IAC; 1342 } 1343 1344 void 1345 slc_end_reply(void) 1346 { 1347 int len; 1348 /* The end of negotiation command requires 2 bytes. */ 1349 if (&slc_replyp[2] > slc_reply_eom) 1350 return; 1351 *slc_replyp++ = IAC; 1352 *slc_replyp++ = SE; 1353 len = slc_replyp - slc_reply; 1354 if (len <= 6) 1355 return; 1356 if (NETROOM() > len) { 1357 ring_supply_data(&netoring, slc_reply, slc_replyp - slc_reply); 1358 printsub('>', &slc_reply[2], slc_replyp - slc_reply - 2); 1359 } 1360 /*@*/else printf("slc_end_reply: not enough room\n"); 1361 } 1362 1363 int 1364 slc_update(void) 1365 { 1366 struct spc *spcp; 1367 int need_update = 0; 1368 1369 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1370 if (!(spcp->flags&SLC_ACK)) 1371 continue; 1372 spcp->flags &= ~SLC_ACK; 1373 if (spcp->valp && (*spcp->valp != spcp->val)) { 1374 *spcp->valp = spcp->val; 1375 need_update = 1; 1376 } 1377 } 1378 return(need_update); 1379 } 1380 1381 #ifdef OLD_ENVIRON 1382 # ifdef ENV_HACK 1383 /* 1384 * Earlier version of telnet/telnetd from the BSD code had 1385 * the definitions of VALUE and VAR reversed. To ensure 1386 * maximum interoperability, we assume that the server is 1387 * an older BSD server, until proven otherwise. The newer 1388 * BSD servers should be able to handle either definition, 1389 * so it is better to use the wrong values if we don't 1390 * know what type of server it is. 1391 */ 1392 int env_auto = 1; 1393 int old_env_var = OLD_ENV_VAR; 1394 int old_env_value = OLD_ENV_VALUE; 1395 # else 1396 # define old_env_var OLD_ENV_VAR 1397 # define old_env_value OLD_ENV_VALUE 1398 # endif 1399 #endif 1400 1401 void 1402 env_opt(unsigned char *buf, int len) 1403 { 1404 unsigned char *ep = NULL, *epc = NULL; 1405 int i; 1406 1407 switch(buf[0]&0xff) { 1408 case TELQUAL_SEND: 1409 env_opt_start(); 1410 if (len == 1) { 1411 env_opt_add(NULL); 1412 } else for (i = 1; i < len; i++) { 1413 switch (buf[i]&0xff) { 1414 #ifdef OLD_ENVIRON 1415 case OLD_ENV_VAR: 1416 # ifdef ENV_HACK 1417 if (telopt_environ == TELOPT_OLD_ENVIRON 1418 && env_auto) { 1419 /* Server has the same definitions */ 1420 old_env_var = OLD_ENV_VAR; 1421 old_env_value = OLD_ENV_VALUE; 1422 } 1423 /* FALL THROUGH */ 1424 # endif 1425 case OLD_ENV_VALUE: 1426 /* 1427 * Although OLD_ENV_VALUE is not legal, we will 1428 * still recognize it, just in case it is an 1429 * old server that has VAR & VALUE mixed up... 1430 */ 1431 /* FALL THROUGH */ 1432 #else 1433 case NEW_ENV_VAR: 1434 #endif 1435 case ENV_USERVAR: 1436 if (ep) { 1437 *epc = 0; 1438 env_opt_add(ep); 1439 } 1440 ep = epc = &buf[i+1]; 1441 break; 1442 case ENV_ESC: 1443 i++; 1444 /*FALL THROUGH*/ 1445 default: 1446 if (epc) 1447 *epc++ = buf[i]; 1448 break; 1449 } 1450 } 1451 if (ep) { 1452 *epc = 0; 1453 env_opt_add(ep); 1454 } 1455 env_opt_end(1); 1456 break; 1457 1458 case TELQUAL_IS: 1459 case TELQUAL_INFO: 1460 /* Ignore for now. We shouldn't get it anyway. */ 1461 break; 1462 1463 default: 1464 break; 1465 } 1466 } 1467 1468 #define OPT_REPLY_SIZE (2 * SUBBUFSIZE) 1469 unsigned char *opt_reply = NULL; 1470 unsigned char *opt_replyp; 1471 unsigned char *opt_replyend; 1472 1473 void 1474 env_opt_start(void) 1475 { 1476 if (opt_reply) 1477 opt_reply = (unsigned char *)realloc(opt_reply, OPT_REPLY_SIZE); 1478 else 1479 opt_reply = (unsigned char *)malloc(OPT_REPLY_SIZE); 1480 if (opt_reply == NULL) { 1481 /*@*/ printf("env_opt_start: malloc()/realloc() failed!!!\n"); 1482 opt_reply = opt_replyp = opt_replyend = NULL; 1483 return; 1484 } 1485 opt_replyp = opt_reply; 1486 opt_replyend = opt_reply + OPT_REPLY_SIZE; 1487 *opt_replyp++ = IAC; 1488 *opt_replyp++ = SB; 1489 *opt_replyp++ = telopt_environ; 1490 *opt_replyp++ = TELQUAL_IS; 1491 } 1492 1493 void 1494 env_opt_start_info(void) 1495 { 1496 env_opt_start(); 1497 if (opt_replyp) 1498 opt_replyp[-1] = TELQUAL_INFO; 1499 } 1500 1501 void 1502 env_opt_add(unsigned char *ep) 1503 { 1504 unsigned char *vp, c; 1505 1506 if (opt_reply == NULL) /*XXX*/ 1507 return; /*XXX*/ 1508 1509 if (ep == NULL || *ep == '\0') { 1510 /* Send user defined variables first. */ 1511 env_default(1, 0); 1512 while ((ep = env_default(0, 0))) 1513 env_opt_add(ep); 1514 1515 /* Now add the list of well know variables. */ 1516 env_default(1, 1); 1517 while ((ep = env_default(0, 1))) 1518 env_opt_add(ep); 1519 return; 1520 } 1521 vp = env_getvalue(ep); 1522 if (opt_replyp + (vp ? 2 * strlen((char *)vp) : 0) + 1523 2 * strlen((char *)ep) + 6 > opt_replyend) 1524 { 1525 1526 int len; 1527 opt_replyend += OPT_REPLY_SIZE; 1528 len = opt_replyend - opt_reply; 1529 opt_reply = (unsigned char *)realloc(opt_reply, len); 1530 if (opt_reply == NULL) { 1531 /*@*/ printf("env_opt_add: realloc() failed!!!\n"); 1532 opt_reply = opt_replyp = opt_replyend = NULL; 1533 return; 1534 } 1535 opt_replyp = opt_reply + len - (opt_replyend - opt_replyp); 1536 opt_replyend = opt_reply + len; 1537 } 1538 if (opt_welldefined(ep)) 1539 #ifdef OLD_ENVIRON 1540 if (telopt_environ == TELOPT_OLD_ENVIRON) 1541 *opt_replyp++ = old_env_var; 1542 else 1543 #endif 1544 *opt_replyp++ = NEW_ENV_VAR; 1545 else 1546 *opt_replyp++ = ENV_USERVAR; 1547 for (;;) { 1548 while ((c = *ep++)) { 1549 if (opt_replyp + (2 + 2) > opt_replyend) 1550 return; 1551 switch(c&0xff) { 1552 case IAC: 1553 *opt_replyp++ = IAC; 1554 break; 1555 case NEW_ENV_VAR: 1556 case NEW_ENV_VALUE: 1557 case ENV_ESC: 1558 case ENV_USERVAR: 1559 *opt_replyp++ = ENV_ESC; 1560 break; 1561 } 1562 *opt_replyp++ = c; 1563 } 1564 if ((ep = vp)) { 1565 if (opt_replyp + (1 + 2 + 2) > opt_replyend) 1566 return; 1567 #ifdef OLD_ENVIRON 1568 if (telopt_environ == TELOPT_OLD_ENVIRON) 1569 *opt_replyp++ = old_env_value; 1570 else 1571 #endif 1572 *opt_replyp++ = NEW_ENV_VALUE; 1573 vp = NULL; 1574 } else 1575 break; 1576 } 1577 } 1578 1579 int 1580 opt_welldefined(const char *ep) 1581 { 1582 if ((strcmp(ep, "USER") == 0) || 1583 (strcmp(ep, "DISPLAY") == 0) || 1584 (strcmp(ep, "PRINTER") == 0) || 1585 (strcmp(ep, "SYSTEMTYPE") == 0) || 1586 (strcmp(ep, "JOB") == 0) || 1587 (strcmp(ep, "ACCT") == 0)) 1588 return(1); 1589 return(0); 1590 } 1591 1592 void 1593 env_opt_end(int emptyok) 1594 { 1595 int len; 1596 1597 if (opt_replyp + 2 > opt_replyend) 1598 return; 1599 len = opt_replyp + 2 - opt_reply; 1600 if (emptyok || len > 6) { 1601 *opt_replyp++ = IAC; 1602 *opt_replyp++ = SE; 1603 if (NETROOM() > len) { 1604 ring_supply_data(&netoring, opt_reply, len); 1605 printsub('>', &opt_reply[2], len - 2); 1606 } 1607 /*@*/ else printf("slc_end_reply: not enough room\n"); 1608 } 1609 if (opt_reply) { 1610 free(opt_reply); 1611 opt_reply = opt_replyp = opt_replyend = NULL; 1612 } 1613 } 1614 1615 1616 1617 int 1618 telrcv(void) 1619 { 1620 int c; 1621 int scc; 1622 unsigned char *sbp; 1623 int count; 1624 int returnValue = 0; 1625 1626 scc = 0; 1627 count = 0; 1628 while (TTYROOM() > 2) { 1629 if (scc == 0) { 1630 if (count) { 1631 ring_consumed(&netiring, count); 1632 returnValue = 1; 1633 count = 0; 1634 } 1635 sbp = netiring.consume; 1636 scc = ring_full_consecutive(&netiring); 1637 if (scc == 0) { 1638 /* No more data coming in */ 1639 break; 1640 } 1641 } 1642 1643 c = *sbp++ & 0xff, scc--; count++; 1644 #ifdef ENCRYPTION 1645 if (decrypt_input) 1646 c = (*decrypt_input)(c); 1647 #endif /* ENCRYPTION */ 1648 1649 switch (telrcv_state) { 1650 1651 case TS_CR: 1652 telrcv_state = TS_DATA; 1653 if (c == '\0') { 1654 break; /* Ignore \0 after CR */ 1655 } 1656 else if ((c == '\n') && my_want_state_is_dont(TELOPT_ECHO) && !crmod) { 1657 TTYADD(c); 1658 break; 1659 } 1660 /* Else, fall through */ 1661 1662 case TS_DATA: 1663 if (c == IAC) { 1664 telrcv_state = TS_IAC; 1665 break; 1666 } 1667 /* 1668 * The 'crmod' hack (see following) is needed 1669 * since we can't * set CRMOD on output only. 1670 * Machines like MULTICS like to send \r without 1671 * \n; since we must turn off CRMOD to get proper 1672 * input, the mapping is done here (sigh). 1673 */ 1674 if ((c == '\r') && my_want_state_is_dont(TELOPT_BINARY)) { 1675 if (scc > 0) { 1676 c = *sbp&0xff; 1677 #ifdef ENCRYPTION 1678 if (decrypt_input) 1679 c = (*decrypt_input)(c); 1680 #endif /* ENCRYPTION */ 1681 if (c == 0) { 1682 sbp++, scc--; count++; 1683 /* a "true" CR */ 1684 TTYADD('\r'); 1685 } else if (my_want_state_is_dont(TELOPT_ECHO) && 1686 (c == '\n')) { 1687 sbp++, scc--; count++; 1688 TTYADD('\n'); 1689 } else { 1690 #ifdef ENCRYPTION 1691 if (decrypt_input) 1692 (*decrypt_input)(-1); 1693 #endif /* ENCRYPTION */ 1694 1695 TTYADD('\r'); 1696 if (crmod) { 1697 TTYADD('\n'); 1698 } 1699 } 1700 } else { 1701 telrcv_state = TS_CR; 1702 TTYADD('\r'); 1703 if (crmod) { 1704 TTYADD('\n'); 1705 } 1706 } 1707 } else { 1708 TTYADD(c); 1709 } 1710 continue; 1711 1712 case TS_IAC: 1713 process_iac: 1714 switch (c) { 1715 1716 case WILL: 1717 telrcv_state = TS_WILL; 1718 continue; 1719 1720 case WONT: 1721 telrcv_state = TS_WONT; 1722 continue; 1723 1724 case DO: 1725 telrcv_state = TS_DO; 1726 continue; 1727 1728 case DONT: 1729 telrcv_state = TS_DONT; 1730 continue; 1731 1732 case DM: 1733 /* 1734 * We may have missed an urgent notification, 1735 * so make sure we flush whatever is in the 1736 * buffer currently. 1737 */ 1738 printoption("RCVD", IAC, DM); 1739 SYNCHing = 1; 1740 (void) ttyflush(1); 1741 SYNCHing = stilloob(); 1742 settimer(gotDM); 1743 break; 1744 1745 case SB: 1746 SB_CLEAR(); 1747 telrcv_state = TS_SB; 1748 continue; 1749 1750 case IAC: 1751 TTYADD(IAC); 1752 break; 1753 1754 case NOP: 1755 case GA: 1756 default: 1757 printoption("RCVD", IAC, c); 1758 break; 1759 } 1760 telrcv_state = TS_DATA; 1761 continue; 1762 1763 case TS_WILL: 1764 printoption("RCVD", WILL, c); 1765 willoption(c); 1766 telrcv_state = TS_DATA; 1767 continue; 1768 1769 case TS_WONT: 1770 printoption("RCVD", WONT, c); 1771 wontoption(c); 1772 telrcv_state = TS_DATA; 1773 continue; 1774 1775 case TS_DO: 1776 printoption("RCVD", DO, c); 1777 dooption(c); 1778 if (c == TELOPT_NAWS) { 1779 sendnaws(); 1780 } else if (c == TELOPT_LFLOW) { 1781 localflow = 1; 1782 setcommandmode(); 1783 setconnmode(0); 1784 } 1785 telrcv_state = TS_DATA; 1786 continue; 1787 1788 case TS_DONT: 1789 printoption("RCVD", DONT, c); 1790 dontoption(c); 1791 flushline = 1; 1792 setconnmode(0); /* set new tty mode (maybe) */ 1793 telrcv_state = TS_DATA; 1794 continue; 1795 1796 case TS_SB: 1797 if (c == IAC) { 1798 telrcv_state = TS_SE; 1799 } else { 1800 SB_ACCUM(c); 1801 } 1802 continue; 1803 1804 case TS_SE: 1805 if (c != SE) { 1806 if (c != IAC) { 1807 /* 1808 * This is an error. We only expect to get 1809 * "IAC IAC" or "IAC SE". Several things may 1810 * have happend. An IAC was not doubled, the 1811 * IAC SE was left off, or another option got 1812 * inserted into the suboption are all possibilities. 1813 * If we assume that the IAC was not doubled, 1814 * and really the IAC SE was left off, we could 1815 * get into an infinate loop here. So, instead, 1816 * we terminate the suboption, and process the 1817 * partial suboption if we can. 1818 */ 1819 SB_ACCUM(IAC); 1820 SB_ACCUM(c); 1821 subpointer -= 2; 1822 SB_TERM(); 1823 1824 printoption("In SUBOPTION processing, RCVD", IAC, c); 1825 suboption(); /* handle sub-option */ 1826 telrcv_state = TS_IAC; 1827 goto process_iac; 1828 } 1829 SB_ACCUM(c); 1830 telrcv_state = TS_SB; 1831 } else { 1832 SB_ACCUM(IAC); 1833 SB_ACCUM(SE); 1834 subpointer -= 2; 1835 SB_TERM(); 1836 suboption(); /* handle sub-option */ 1837 telrcv_state = TS_DATA; 1838 } 1839 } 1840 } 1841 if (count) 1842 ring_consumed(&netiring, count); 1843 return returnValue||count; 1844 } 1845 1846 static int bol = 1, local = 0; 1847 1848 int 1849 rlogin_susp(void) 1850 { 1851 if (local) { 1852 local = 0; 1853 bol = 1; 1854 command(0, "z\n", 2); 1855 return(1); 1856 } 1857 return(0); 1858 } 1859 1860 static int 1861 telsnd(void) 1862 { 1863 int tcc; 1864 int count; 1865 int returnValue = 0; 1866 unsigned char *tbp; 1867 1868 tcc = 0; 1869 count = 0; 1870 while (NETROOM() > 2) { 1871 int sc; 1872 int c; 1873 1874 if (tcc == 0) { 1875 if (count) { 1876 ring_consumed(&ttyiring, count); 1877 returnValue = 1; 1878 count = 0; 1879 } 1880 tbp = ttyiring.consume; 1881 tcc = ring_full_consecutive(&ttyiring); 1882 if (tcc == 0) { 1883 break; 1884 } 1885 } 1886 c = *tbp++ & 0xff, sc = strip(c), tcc--; count++; 1887 if (rlogin != _POSIX_VDISABLE) { 1888 if (bol) { 1889 bol = 0; 1890 if (sc == rlogin) { 1891 local = 1; 1892 continue; 1893 } 1894 } else if (local) { 1895 local = 0; 1896 if (sc == '.' || c == termEofChar) { 1897 bol = 1; 1898 command(0, "close\n", 6); 1899 continue; 1900 } 1901 if (sc == termSuspChar) { 1902 bol = 1; 1903 command(0, "z\n", 2); 1904 continue; 1905 } 1906 if (sc == escape) { 1907 command(0, tbp, tcc); 1908 bol = 1; 1909 count += tcc; 1910 tcc = 0; 1911 flushline = 1; 1912 break; 1913 } 1914 if (sc != rlogin) { 1915 ++tcc; 1916 --tbp; 1917 --count; 1918 c = sc = rlogin; 1919 } 1920 } 1921 if ((sc == '\n') || (sc == '\r')) 1922 bol = 1; 1923 } else if (escape != _POSIX_VDISABLE && sc == escape) { 1924 /* 1925 * Double escape is a pass through of a single escape character. 1926 */ 1927 if (tcc && strip(*tbp) == escape) { 1928 tbp++; 1929 tcc--; 1930 count++; 1931 bol = 0; 1932 } else { 1933 command(0, (char *)tbp, tcc); 1934 bol = 1; 1935 count += tcc; 1936 tcc = 0; 1937 flushline = 1; 1938 break; 1939 } 1940 } else 1941 bol = 0; 1942 #ifdef KLUDGELINEMODE 1943 if (kludgelinemode && (globalmode&MODE_EDIT) && (sc == echoc)) { 1944 if (tcc > 0 && strip(*tbp) == echoc) { 1945 tcc--; tbp++; count++; 1946 } else { 1947 dontlecho = !dontlecho; 1948 settimer(echotoggle); 1949 setconnmode(0); 1950 flushline = 1; 1951 break; 1952 } 1953 } 1954 #endif 1955 if (MODE_LOCAL_CHARS(globalmode)) { 1956 if (TerminalSpecialChars(sc) == 0) { 1957 bol = 1; 1958 break; 1959 } 1960 } 1961 if (my_want_state_is_wont(TELOPT_BINARY)) { 1962 switch (c) { 1963 case '\n': 1964 /* 1965 * If we are in CRMOD mode (\r ==> \n) 1966 * on our local machine, then probably 1967 * a newline (unix) is CRLF (TELNET). 1968 */ 1969 if (MODE_LOCAL_CHARS(globalmode)) { 1970 NETADD('\r'); 1971 } 1972 NETADD('\n'); 1973 bol = flushline = 1; 1974 break; 1975 case '\r': 1976 if (!crlf) { 1977 NET2ADD('\r', '\0'); 1978 } else { 1979 NET2ADD('\r', '\n'); 1980 } 1981 bol = flushline = 1; 1982 break; 1983 case IAC: 1984 NET2ADD(IAC, IAC); 1985 break; 1986 default: 1987 NETADD(c); 1988 break; 1989 } 1990 } else if (c == IAC) { 1991 NET2ADD(IAC, IAC); 1992 } else { 1993 NETADD(c); 1994 } 1995 } 1996 if (count) 1997 ring_consumed(&ttyiring, count); 1998 return returnValue||count; /* Non-zero if we did anything */ 1999 } 2000 2001 /* 2002 * Scheduler() 2003 * 2004 * Try to do something. 2005 * 2006 * If we do something useful, return 1; else return 0. 2007 * 2008 */ 2009 2010 static int 2011 Scheduler(int block) 2012 { 2013 /* One wants to be a bit careful about setting returnValue 2014 * to one, since a one implies we did some useful work, 2015 * and therefore probably won't be called to block next 2016 */ 2017 int returnValue; 2018 int netin, netout, netex, ttyin, ttyout; 2019 2020 /* Decide which rings should be processed */ 2021 2022 netout = ring_full_count(&netoring) && 2023 (flushline || 2024 (my_want_state_is_wont(TELOPT_LINEMODE) 2025 #ifdef KLUDGELINEMODE 2026 && (!kludgelinemode || my_want_state_is_do(TELOPT_SGA)) 2027 #endif 2028 ) || 2029 my_want_state_is_will(TELOPT_BINARY)); 2030 ttyout = ring_full_count(&ttyoring); 2031 2032 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0); 2033 2034 netin = !ISend && ring_empty_count(&netiring); 2035 2036 netex = !SYNCHing; 2037 2038 /* Call to system code to process rings */ 2039 2040 returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block); 2041 2042 /* Now, look at the input rings, looking for work to do. */ 2043 2044 if (ring_full_count(&ttyiring)) { 2045 returnValue |= telsnd(); 2046 } 2047 2048 if (ring_full_count(&netiring)) { 2049 returnValue |= telrcv(); 2050 } 2051 return returnValue; 2052 } 2053 2054 #ifdef AUTHENTICATION 2055 #define __unusedhere 2056 #else 2057 #define __unusedhere __unused 2058 #endif 2059 /* 2060 * Select from tty and network... 2061 */ 2062 void 2063 telnet(char *user __unusedhere) 2064 { 2065 sys_telnet_init(); 2066 2067 #ifdef AUTHENTICATION 2068 #ifdef ENCRYPTION 2069 { 2070 static char local_host[256] = { 0 }; 2071 2072 if (!local_host[0]) { 2073 gethostname(local_host, sizeof(local_host)); 2074 local_host[sizeof(local_host)-1] = 0; 2075 } 2076 auth_encrypt_init(local_host, hostname, "TELNET", 0); 2077 auth_encrypt_user(user); 2078 } 2079 #endif 2080 #endif 2081 if (telnetport) { 2082 #ifdef AUTHENTICATION 2083 if (autologin) 2084 send_will(TELOPT_AUTHENTICATION, 1); 2085 #endif 2086 #ifdef ENCRYPTION 2087 send_do(TELOPT_ENCRYPT, 1); 2088 send_will(TELOPT_ENCRYPT, 1); 2089 #endif /* ENCRYPTION */ 2090 send_do(TELOPT_SGA, 1); 2091 send_will(TELOPT_TTYPE, 1); 2092 send_will(TELOPT_NAWS, 1); 2093 send_will(TELOPT_TSPEED, 1); 2094 send_will(TELOPT_LFLOW, 1); 2095 send_will(TELOPT_LINEMODE, 1); 2096 send_will(TELOPT_NEW_ENVIRON, 1); 2097 send_do(TELOPT_STATUS, 1); 2098 if (env_getvalue("DISPLAY")) 2099 send_will(TELOPT_XDISPLOC, 1); 2100 if (eight) 2101 tel_enter_binary(eight); 2102 } 2103 2104 for (;;) { 2105 int schedValue; 2106 2107 while ((schedValue = Scheduler(0)) != 0) { 2108 if (schedValue == -1) { 2109 setcommandmode(); 2110 return; 2111 } 2112 } 2113 2114 if (Scheduler(1) == -1) { 2115 setcommandmode(); 2116 return; 2117 } 2118 } 2119 } 2120 2121 #if 0 /* XXX - this not being in is a bug */ 2122 /* 2123 * nextitem() 2124 * 2125 * Return the address of the next "item" in the TELNET data 2126 * stream. This will be the address of the next character if 2127 * the current address is a user data character, or it will 2128 * be the address of the character following the TELNET command 2129 * if the current address is a TELNET IAC ("I Am a Command") 2130 * character. 2131 */ 2132 2133 static char * 2134 nextitem(char *current) 2135 { 2136 if ((*current&0xff) != IAC) { 2137 return current+1; 2138 } 2139 switch (*(current+1)&0xff) { 2140 case DO: 2141 case DONT: 2142 case WILL: 2143 case WONT: 2144 return current+3; 2145 case SB: /* loop forever looking for the SE */ 2146 { 2147 char *look = current+2; 2148 2149 for (;;) { 2150 if ((*look++&0xff) == IAC) { 2151 if ((*look++&0xff) == SE) { 2152 return look; 2153 } 2154 } 2155 } 2156 } 2157 default: 2158 return current+2; 2159 } 2160 } 2161 #endif /* 0 */ 2162 2163 /* 2164 * netclear() 2165 * 2166 * We are about to do a TELNET SYNCH operation. Clear 2167 * the path to the network. 2168 * 2169 * Things are a bit tricky since we may have sent the first 2170 * byte or so of a previous TELNET command into the network. 2171 * So, we have to scan the network buffer from the beginning 2172 * until we are up to where we want to be. 2173 * 2174 * A side effect of what we do, just to keep things 2175 * simple, is to clear the urgent data pointer. The principal 2176 * caller should be setting the urgent data pointer AFTER calling 2177 * us in any case. 2178 */ 2179 2180 static void 2181 netclear(void) 2182 { 2183 /* Deleted */ 2184 } 2185 2186 /* 2187 * These routines add various telnet commands to the data stream. 2188 */ 2189 2190 static void 2191 doflush(void) 2192 { 2193 NET2ADD(IAC, DO); 2194 NETADD(TELOPT_TM); 2195 flushline = 1; 2196 flushout = 1; 2197 (void) ttyflush(1); /* Flush/drop output */ 2198 /* do printoption AFTER flush, otherwise the output gets tossed... */ 2199 printoption("SENT", DO, TELOPT_TM); 2200 } 2201 2202 void 2203 xmitAO(void) 2204 { 2205 NET2ADD(IAC, AO); 2206 printoption("SENT", IAC, AO); 2207 if (autoflush) { 2208 doflush(); 2209 } 2210 } 2211 2212 void 2213 xmitEL(void) 2214 { 2215 NET2ADD(IAC, EL); 2216 printoption("SENT", IAC, EL); 2217 } 2218 2219 void 2220 xmitEC(void) 2221 { 2222 NET2ADD(IAC, EC); 2223 printoption("SENT", IAC, EC); 2224 } 2225 2226 int 2227 dosynch(char *ch __unused) 2228 { 2229 netclear(); /* clear the path to the network */ 2230 NETADD(IAC); 2231 setneturg(); 2232 NETADD(DM); 2233 printoption("SENT", IAC, DM); 2234 return 1; 2235 } 2236 2237 int want_status_response = 0; 2238 2239 int 2240 get_status(char *ch __unused) 2241 { 2242 unsigned char tmp[16]; 2243 unsigned char *cp; 2244 2245 if (my_want_state_is_dont(TELOPT_STATUS)) { 2246 printf("Remote side does not support STATUS option\n"); 2247 return 0; 2248 } 2249 cp = tmp; 2250 2251 *cp++ = IAC; 2252 *cp++ = SB; 2253 *cp++ = TELOPT_STATUS; 2254 *cp++ = TELQUAL_SEND; 2255 *cp++ = IAC; 2256 *cp++ = SE; 2257 if (NETROOM() >= cp - tmp) { 2258 ring_supply_data(&netoring, tmp, cp-tmp); 2259 printsub('>', tmp+2, cp - tmp - 2); 2260 } 2261 ++want_status_response; 2262 return 1; 2263 } 2264 2265 void 2266 intp(void) 2267 { 2268 NET2ADD(IAC, IP); 2269 printoption("SENT", IAC, IP); 2270 flushline = 1; 2271 if (autoflush) { 2272 doflush(); 2273 } 2274 if (autosynch) { 2275 dosynch(NULL); 2276 } 2277 } 2278 2279 void 2280 sendbrk(void) 2281 { 2282 NET2ADD(IAC, BREAK); 2283 printoption("SENT", IAC, BREAK); 2284 flushline = 1; 2285 if (autoflush) { 2286 doflush(); 2287 } 2288 if (autosynch) { 2289 dosynch(NULL); 2290 } 2291 } 2292 2293 void 2294 sendabort(void) 2295 { 2296 NET2ADD(IAC, ABORT); 2297 printoption("SENT", IAC, ABORT); 2298 flushline = 1; 2299 if (autoflush) { 2300 doflush(); 2301 } 2302 if (autosynch) { 2303 dosynch(NULL); 2304 } 2305 } 2306 2307 void 2308 sendsusp(void) 2309 { 2310 NET2ADD(IAC, SUSP); 2311 printoption("SENT", IAC, SUSP); 2312 flushline = 1; 2313 if (autoflush) { 2314 doflush(); 2315 } 2316 if (autosynch) { 2317 dosynch(NULL); 2318 } 2319 } 2320 2321 void 2322 sendeof(void) 2323 { 2324 NET2ADD(IAC, xEOF); 2325 printoption("SENT", IAC, xEOF); 2326 } 2327 2328 void 2329 sendayt(void) 2330 { 2331 NET2ADD(IAC, AYT); 2332 printoption("SENT", IAC, AYT); 2333 } 2334 2335 /* 2336 * Send a window size update to the remote system. 2337 */ 2338 2339 void 2340 sendnaws(void) 2341 { 2342 long rows, cols; 2343 unsigned char tmp[16]; 2344 unsigned char *cp; 2345 2346 if (my_state_is_wont(TELOPT_NAWS)) 2347 return; 2348 2349 #define PUTSHORT(cp, x) { if ((*cp++ = ((x)>>8)&0xff) == IAC) *cp++ = IAC; \ 2350 if ((*cp++ = ((x))&0xff) == IAC) *cp++ = IAC; } 2351 2352 if (TerminalWindowSize(&rows, &cols) == 0) { /* Failed */ 2353 return; 2354 } 2355 2356 cp = tmp; 2357 2358 *cp++ = IAC; 2359 *cp++ = SB; 2360 *cp++ = TELOPT_NAWS; 2361 PUTSHORT(cp, cols); 2362 PUTSHORT(cp, rows); 2363 *cp++ = IAC; 2364 *cp++ = SE; 2365 if (NETROOM() >= cp - tmp) { 2366 ring_supply_data(&netoring, tmp, cp-tmp); 2367 printsub('>', tmp+2, cp - tmp - 2); 2368 } 2369 } 2370 2371 void 2372 tel_enter_binary(int rw) 2373 { 2374 if (rw&1) 2375 send_do(TELOPT_BINARY, 1); 2376 if (rw&2) 2377 send_will(TELOPT_BINARY, 1); 2378 } 2379 2380 void 2381 tel_leave_binary(int rw) 2382 { 2383 if (rw&1) 2384 send_dont(TELOPT_BINARY, 1); 2385 if (rw&2) 2386 send_wont(TELOPT_BINARY, 1); 2387 } 2388