telnet.c revision 1.15
1 /* $NetBSD: telnet.c,v 1.15 2000/05/25 12:25:15 blymn Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)telnet.c 8.4 (Berkeley) 5/30/95"; 40 #else 41 __RCSID("$NetBSD: telnet.c,v 1.15 2000/05/25 12:25:15 blymn Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <sys/types.h> 46 47 #if defined(unix) 48 #include <signal.h> 49 #include <termcap.h> 50 /* By the way, we need to include curses.h before telnet.h since, 51 * among other things, telnet.h #defines 'DO', which is a variable 52 * declared in curses.h. 53 */ 54 #endif /* defined(unix) */ 55 56 #include <arpa/telnet.h> 57 58 #include <ctype.h> 59 60 #include "ring.h" 61 62 #include "defines.h" 63 #include "externs.h" 64 #include "types.h" 65 #include "general.h" 66 67 68 #define strip(x) ((my_want_state_is_wont(TELOPT_BINARY)) ? ((x)&0x7f) : (x)) 70 71 static unsigned char subbuffer[SUBBUFSIZE], 72 *subpointer, *subend; /* buffer for sub-options */ 73 #define SB_CLEAR() subpointer = subbuffer; 74 #define SB_TERM() { subend = subpointer; SB_CLEAR(); } 75 #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \ 76 *subpointer++ = (c); \ 77 } 78 79 #define SB_GET() ((*subpointer++)&0xff) 80 #define SB_PEEK() ((*subpointer)&0xff) 81 #define SB_EOF() (subpointer >= subend) 82 #define SB_LEN() (subend - subpointer) 83 84 char options[256]; /* The combined options */ 85 char do_dont_resp[256]; 86 char will_wont_resp[256]; 87 88 int 89 eight = 0, 90 autologin = 0, /* Autologin anyone? */ 91 skiprc = 0, 92 connected, 93 showoptions, 94 In3270, /* Are we in 3270 mode? */ 95 ISend, /* trying to send network data in */ 96 debug = 0, 97 crmod, 98 netdata, /* Print out network data flow */ 99 crlf, /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */ 100 #if defined(TN3270) 101 noasynchtty = 0,/* User specified "-noasynch" on command line */ 102 noasynchnet = 0,/* User specified "-noasynch" on command line */ 103 askedSGA = 0, /* We have talked about suppress go ahead */ 104 #endif /* defined(TN3270) */ 105 telnetport, 106 SYNCHing, /* we are in TELNET SYNCH mode */ 107 flushout, /* flush output */ 108 autoflush = 0, /* flush output when interrupting? */ 109 autosynch, /* send interrupt characters with SYNCH? */ 110 localflow, /* we handle flow control locally */ 111 restartany, /* if flow control enabled, restart on any character */ 112 localchars, /* we recognize interrupt/quit */ 113 donelclchars, /* the user has set "localchars" */ 114 donebinarytoggle, /* the user has put us in binary */ 115 dontlecho, /* do we suppress local echoing right now? */ 116 globalmode, 117 doaddrlookup = 1, /* do a reverse address lookup? */ 118 clienteof = 0; 119 120 char *prompt = 0; 121 122 cc_t escape; 123 cc_t rlogin; 124 #ifdef KLUDGELINEMODE 125 cc_t echoc; 126 #endif 127 128 /* 129 * Telnet receiver states for fsm 130 */ 131 #define TS_DATA 0 132 #define TS_IAC 1 133 #define TS_WILL 2 134 #define TS_WONT 3 135 #define TS_DO 4 136 #define TS_DONT 5 137 #define TS_CR 6 138 #define TS_SB 7 /* sub-option collection */ 139 #define TS_SE 8 /* looking for sub-option end */ 140 141 static int telrcv_state; 142 #ifdef OLD_ENVIRON 143 unsigned char telopt_environ = TELOPT_NEW_ENVIRON; 144 #else 145 # define telopt_environ TELOPT_NEW_ENVIRON 146 #endif 147 148 jmp_buf toplevel = { 0 }; 149 jmp_buf peerdied; 150 151 int flushline; 152 int linemode; 153 154 #ifdef KLUDGELINEMODE 155 int kludgelinemode = 1; 156 #endif 157 158 static void dooption P((int)); 159 static void dontoption P((int)); 160 static void suboption P((void)); 161 static int telsnd P((void)); 162 static void netclear P((void)); 163 static void doflush P((void)); 164 165 /* 166 * The following are some clocks used to decide how to interpret 167 * the relationship between various variables. 168 */ 169 170 Clocks clocks; 171 172 #ifdef notdef 174 Modelist modelist[] = { 175 { "telnet command mode", COMMAND_LINE }, 176 { "character-at-a-time mode", 0 }, 177 { "character-at-a-time mode (local echo)", LOCAL_ECHO|LOCAL_CHARS }, 178 { "line-by-line mode (remote echo)", LINE | LOCAL_CHARS }, 179 { "line-by-line mode", LINE | LOCAL_ECHO | LOCAL_CHARS }, 180 { "line-by-line mode (local echoing suppressed)", LINE | LOCAL_CHARS }, 181 { "3270 mode", 0 }, 182 }; 183 #endif 184 185 186 /* 188 * Initialize telnet environment. 189 */ 190 191 void 192 init_telnet() 193 { 194 env_init(); 195 196 SB_CLEAR(); 197 ClearArray(options); 198 199 connected = In3270 = ISend = localflow = donebinarytoggle = 0; 200 #if defined(AUTHENTICATION) 201 auth_encrypt_connect(connected); 202 #endif /* defined(AUTHENTICATION) */ 203 restartany = -1; 204 205 SYNCHing = 0; 206 207 /* Don't change NetTrace */ 208 209 escape = CONTROL(']'); 210 rlogin = _POSIX_VDISABLE; 211 #ifdef KLUDGELINEMODE 212 echoc = CONTROL('E'); 213 #endif 214 215 flushline = 1; 216 telrcv_state = TS_DATA; 217 } 218 219 221 #ifdef notdef 222 #include <varargs.h> 223 224 /*VARARGS*/ 225 static void 226 printring(va_alist) 227 va_dcl 228 { 229 va_list ap; 230 char buffer[100]; /* where things go */ 231 char *ptr; 232 char *format; 233 char *string; 234 Ring *ring; 235 int i; 236 237 va_start(ap); 238 239 ring = va_arg(ap, Ring *); 240 format = va_arg(ap, char *); 241 ptr = buffer; 242 243 while ((i = *format++) != 0) { 244 if (i == '%') { 245 i = *format++; 246 switch (i) { 247 case 'c': 248 *ptr++ = va_arg(ap, int); 249 break; 250 case 's': 251 string = va_arg(ap, char *); 252 ring_supply_data(ring, buffer, ptr-buffer); 253 ring_supply_data(ring, string, strlen(string)); 254 ptr = buffer; 255 break; 256 case 0: 257 ExitString("printring: trailing %%.\n", 1); 258 /*NOTREACHED*/ 259 default: 260 ExitString("printring: unknown format character.\n", 1); 261 /*NOTREACHED*/ 262 } 263 } else { 264 *ptr++ = i; 265 } 266 } 267 ring_supply_data(ring, buffer, ptr-buffer); 268 } 269 #endif 270 271 /* 272 * These routines are in charge of sending option negotiations 273 * to the other side. 274 * 275 * The basic idea is that we send the negotiation if either side 276 * is in disagreement as to what the current state should be. 277 */ 278 279 void 280 send_do(c, init) 281 register int c, init; 282 { 283 if (init) { 284 if (((do_dont_resp[c] == 0) && my_state_is_do(c)) || 285 my_want_state_is_do(c)) 286 return; 287 set_my_want_state_do(c); 288 do_dont_resp[c]++; 289 } 290 NET2ADD(IAC, DO); 291 NETADD(c); 292 printoption("SENT", DO, c); 293 } 294 295 void 296 send_dont(c, init) 297 register int c, init; 298 { 299 if (init) { 300 if (((do_dont_resp[c] == 0) && my_state_is_dont(c)) || 301 my_want_state_is_dont(c)) 302 return; 303 set_my_want_state_dont(c); 304 do_dont_resp[c]++; 305 } 306 NET2ADD(IAC, DONT); 307 NETADD(c); 308 printoption("SENT", DONT, c); 309 } 310 311 void 312 send_will(c, init) 313 register int c, init; 314 { 315 if (init) { 316 if (((will_wont_resp[c] == 0) && my_state_is_will(c)) || 317 my_want_state_is_will(c)) 318 return; 319 set_my_want_state_will(c); 320 will_wont_resp[c]++; 321 } 322 NET2ADD(IAC, WILL); 323 NETADD(c); 324 printoption("SENT", WILL, c); 325 } 326 327 void 328 send_wont(c, init) 329 register int c, init; 330 { 331 if (init) { 332 if (((will_wont_resp[c] == 0) && my_state_is_wont(c)) || 333 my_want_state_is_wont(c)) 334 return; 335 set_my_want_state_wont(c); 336 will_wont_resp[c]++; 337 } 338 NET2ADD(IAC, WONT); 339 NETADD(c); 340 printoption("SENT", WONT, c); 341 } 342 343 344 void 345 willoption(option) 346 int option; 347 { 348 int new_state_ok = 0; 349 350 if (do_dont_resp[option]) { 351 --do_dont_resp[option]; 352 if (do_dont_resp[option] && my_state_is_do(option)) 353 --do_dont_resp[option]; 354 } 355 356 if ((do_dont_resp[option] == 0) && my_want_state_is_dont(option)) { 357 358 switch (option) { 359 360 case TELOPT_ECHO: 361 # if defined(TN3270) 362 /* 363 * The following is a pain in the rear-end. 364 * Various IBM servers (some versions of Wiscnet, 365 * possibly Fibronics/Spartacus, and who knows who 366 * else) will NOT allow us to send "DO SGA" too early 367 * in the setup proceedings. On the other hand, 368 * 4.2 servers (telnetd) won't set SGA correctly. 369 * So, we are stuck. Empirically (but, based on 370 * a VERY small sample), the IBM servers don't send 371 * out anything about ECHO, so we postpone our sending 372 * "DO SGA" until we see "WILL ECHO" (which 4.2 servers 373 * DO send). 374 */ 375 { 376 if (askedSGA == 0) { 377 askedSGA = 1; 378 if (my_want_state_is_dont(TELOPT_SGA)) 379 send_do(TELOPT_SGA, 1); 380 } 381 } 382 /* Fall through */ 383 case TELOPT_EOR: 384 #endif /* defined(TN3270) */ 385 case TELOPT_BINARY: 386 case TELOPT_SGA: 387 settimer(modenegotiated); 388 /* FALL THROUGH */ 389 case TELOPT_STATUS: 390 #if defined(AUTHENTICATION) 391 case TELOPT_AUTHENTICATION: 392 #endif 393 new_state_ok = 1; 394 break; 395 396 case TELOPT_TM: 397 if (flushout) 398 flushout = 0; 399 /* 400 * Special case for TM. If we get back a WILL, 401 * pretend we got back a WONT. 402 */ 403 set_my_want_state_dont(option); 404 set_my_state_dont(option); 405 return; /* Never reply to TM will's/wont's */ 406 407 case TELOPT_LINEMODE: 408 default: 409 break; 410 } 411 412 if (new_state_ok) { 413 set_my_want_state_do(option); 414 send_do(option, 0); 415 setconnmode(0); /* possibly set new tty mode */ 416 } else { 417 do_dont_resp[option]++; 418 send_dont(option, 0); 419 } 420 } 421 set_my_state_do(option); 422 } 423 424 void 425 wontoption(option) 426 int option; 427 { 428 if (do_dont_resp[option]) { 429 --do_dont_resp[option]; 430 if (do_dont_resp[option] && my_state_is_dont(option)) 431 --do_dont_resp[option]; 432 } 433 434 if ((do_dont_resp[option] == 0) && my_want_state_is_do(option)) { 435 436 switch (option) { 437 438 #ifdef KLUDGELINEMODE 439 case TELOPT_SGA: 440 if (!kludgelinemode) 441 break; 442 /* FALL THROUGH */ 443 #endif 444 case TELOPT_ECHO: 445 settimer(modenegotiated); 446 break; 447 448 case TELOPT_TM: 449 if (flushout) 450 flushout = 0; 451 set_my_want_state_dont(option); 452 set_my_state_dont(option); 453 return; /* Never reply to TM will's/wont's */ 454 455 default: 456 break; 457 } 458 set_my_want_state_dont(option); 459 if (my_state_is_do(option)) 460 send_dont(option, 0); 461 setconnmode(0); /* Set new tty mode */ 462 } else if (option == TELOPT_TM) { 463 /* 464 * Special case for TM. 465 */ 466 if (flushout) 467 flushout = 0; 468 set_my_want_state_dont(option); 469 } 470 set_my_state_dont(option); 471 } 472 473 static void 474 dooption(option) 475 int option; 476 { 477 int new_state_ok = 0; 478 479 if (will_wont_resp[option]) { 480 --will_wont_resp[option]; 481 if (will_wont_resp[option] && my_state_is_will(option)) 482 --will_wont_resp[option]; 483 } 484 485 if (will_wont_resp[option] == 0) { 486 if (my_want_state_is_wont(option)) { 487 488 switch (option) { 489 490 case TELOPT_TM: 491 /* 492 * Special case for TM. We send a WILL, but pretend 493 * we sent WONT. 494 */ 495 send_will(option, 0); 496 set_my_want_state_wont(TELOPT_TM); 497 set_my_state_wont(TELOPT_TM); 498 return; 499 500 # if defined(TN3270) 501 case TELOPT_EOR: /* end of record */ 502 # endif /* defined(TN3270) */ 503 case TELOPT_BINARY: /* binary mode */ 504 case TELOPT_NAWS: /* window size */ 505 case TELOPT_TSPEED: /* terminal speed */ 506 case TELOPT_LFLOW: /* local flow control */ 507 case TELOPT_TTYPE: /* terminal type option */ 508 case TELOPT_SGA: /* no big deal */ 509 new_state_ok = 1; 510 break; 511 512 case TELOPT_NEW_ENVIRON: /* New environment variable option */ 513 #ifdef OLD_ENVIRON 514 if (my_state_is_will(TELOPT_OLD_ENVIRON)) 515 send_wont(TELOPT_OLD_ENVIRON, 1); /* turn off the old */ 516 goto env_common; 517 case TELOPT_OLD_ENVIRON: /* Old environment variable option */ 518 if (my_state_is_will(TELOPT_NEW_ENVIRON)) 519 break; /* Don't enable if new one is in use! */ 520 env_common: 521 telopt_environ = option; 522 #endif 523 new_state_ok = 1; 524 break; 525 526 #if defined(AUTHENTICATION) 527 case TELOPT_AUTHENTICATION: 528 if (autologin) 529 new_state_ok = 1; 530 break; 531 #endif 532 533 case TELOPT_XDISPLOC: /* X Display location */ 534 if (env_getvalue((unsigned char *)"DISPLAY")) 535 new_state_ok = 1; 536 break; 537 538 case TELOPT_LINEMODE: 539 #ifdef KLUDGELINEMODE 540 kludgelinemode = 0; 541 send_do(TELOPT_SGA, 1); 542 #endif 543 set_my_want_state_will(TELOPT_LINEMODE); 544 send_will(option, 0); 545 set_my_state_will(TELOPT_LINEMODE); 546 slc_init(); 547 return; 548 549 case TELOPT_ECHO: /* We're never going to echo... */ 550 default: 551 break; 552 } 553 554 if (new_state_ok) { 555 set_my_want_state_will(option); 556 send_will(option, 0); 557 setconnmode(0); /* Set new tty mode */ 558 } else { 559 will_wont_resp[option]++; 560 send_wont(option, 0); 561 } 562 } else { 563 /* 564 * Handle options that need more things done after the 565 * other side has acknowledged the option. 566 */ 567 switch (option) { 568 case TELOPT_LINEMODE: 569 #ifdef KLUDGELINEMODE 570 kludgelinemode = 0; 571 send_do(TELOPT_SGA, 1); 572 #endif 573 set_my_state_will(option); 574 slc_init(); 575 send_do(TELOPT_SGA, 0); 576 return; 577 } 578 } 579 } 580 set_my_state_will(option); 581 } 582 583 static void 584 dontoption(option) 585 int option; 586 { 587 588 if (will_wont_resp[option]) { 589 --will_wont_resp[option]; 590 if (will_wont_resp[option] && my_state_is_wont(option)) 591 --will_wont_resp[option]; 592 } 593 594 if ((will_wont_resp[option] == 0) && my_want_state_is_will(option)) { 595 switch (option) { 596 case TELOPT_LINEMODE: 597 linemode = 0; /* put us back to the default state */ 598 break; 599 #ifdef OLD_ENVIRON 600 case TELOPT_NEW_ENVIRON: 601 /* 602 * The new environ option wasn't recognized, try 603 * the old one. 604 */ 605 send_will(TELOPT_OLD_ENVIRON, 1); 606 telopt_environ = TELOPT_OLD_ENVIRON; 607 break; 608 #endif 609 } 610 /* we always accept a DONT */ 611 set_my_want_state_wont(option); 612 if (my_state_is_will(option)) 613 send_wont(option, 0); 614 setconnmode(0); /* Set new tty mode */ 615 } 616 set_my_state_wont(option); 617 } 618 619 /* 620 * Given a buffer returned by tgetent(), this routine will turn 621 * the pipe seperated list of names in the buffer into an array 622 * of pointers to null terminated names. We toss out any bad, 623 * duplicate, or verbose names (names with spaces). 624 */ 625 626 static char *name_unknown = "UNKNOWN"; 627 static char *unknown[] = { 0, 0 }; 628 629 char ** 630 mklist(buf, name) 631 char *buf, *name; 632 { 633 register int n; 634 register char c, *cp, **argvp, *cp2, **argv, **avt; 635 636 if (name) { 637 if ((int)strlen(name) > 40) { 638 name = 0; 639 unknown[0] = name_unknown; 640 } else { 641 unknown[0] = name; 642 upcase(name); 643 } 644 } else 645 unknown[0] = name_unknown; 646 /* 647 * Count up the number of names. 648 */ 649 for (n = 1, cp = buf; *cp && *cp != ':'; cp++) { 650 if (*cp == '|') 651 n++; 652 } 653 /* 654 * Allocate an array to put the name pointers into 655 */ 656 argv = (char **)malloc((n+3)*sizeof(char *)); 657 if (argv == 0) 658 return(unknown); 659 660 /* 661 * Fill up the array of pointers to names. 662 */ 663 *argv = 0; 664 argvp = argv+1; 665 n = 0; 666 for (cp = cp2 = buf; (c = *cp); cp++) { 667 if (c == '|' || c == ':') { 668 *cp++ = '\0'; 669 /* 670 * Skip entries that have spaces or are over 40 671 * characters long. If this is our environment 672 * name, then put it up front. Otherwise, as 673 * long as this is not a duplicate name (case 674 * insensitive) add it to the list. 675 */ 676 if (n || (cp - cp2 > 41)) 677 ; 678 else if (name && (strncasecmp(name, cp2, cp-cp2) == 0)) 679 *argv = cp2; 680 else if (is_unique(cp2, argv+1, argvp)) 681 *argvp++ = cp2; 682 if (c == ':') 683 break; 684 /* 685 * Skip multiple delimiters. Reset cp2 to 686 * the beginning of the next name. Reset n, 687 * the flag for names with spaces. 688 */ 689 while ((c = *cp) == '|') 690 cp++; 691 cp2 = cp; 692 n = 0; 693 } 694 /* 695 * Skip entries with spaces or non-ascii values. 696 * Convert lower case letters to upper case. 697 */ 698 if ((c == ' ') || !isascii(c)) 699 n = 1; 700 else if (islower((unsigned char)c)) 701 *cp = toupper(c); 702 } 703 704 /* 705 * Check for an old V6 2 character name. If the second 706 * name points to the beginning of the buffer, and is 707 * only 2 characters long, move it to the end of the array. 708 */ 709 if ((argv[1] == buf) && (strlen(argv[1]) == 2)) { 710 --argvp; 711 for (avt = &argv[1]; avt < argvp; avt++) 712 *avt = *(avt+1); 713 *argvp++ = buf; 714 } 715 716 /* 717 * Duplicate last name, for TTYPE option, and null 718 * terminate the array. If we didn't find a match on 719 * our terminal name, put that name at the beginning. 720 */ 721 cp = *(argvp-1); 722 *argvp++ = cp; 723 *argvp = 0; 724 725 if (*argv == 0) { 726 if (name) 727 *argv = name; 728 else { 729 --argvp; 730 for (avt = argv; avt < argvp; avt++) 731 *avt = *(avt+1); 732 } 733 } 734 if (*argv) 735 return(argv); 736 else 737 return(unknown); 738 } 739 740 int 741 is_unique(name, as, ae) 742 register char *name, **as, **ae; 743 { 744 register char **ap; 745 register int n; 746 747 n = strlen(name) + 1; 748 for (ap = as; ap < ae; ap++) 749 if (strncasecmp(*ap, name, n) == 0) 750 return(0); 751 return (1); 752 } 753 754 #ifdef TERMCAP 755 char *termbuf; 756 757 /*ARGSUSED*/ 758 int 759 setup_term(tname, fd, errp) 760 char *tname; 761 int fd, *errp; 762 { 763 char zz[1024], *zz_ptr; 764 char *ext_tc, *newptr; 765 766 if ((termbuf = (char *) malloc(1024)) == NULL) 767 goto error; 768 769 if (tgetent(termbuf, tname) == 1) { 770 /* check for ZZ capability, which indicates termcap truncated */ 771 zz_ptr = zz; 772 if (tgetstr("ZZ", &zz_ptr) != NULL) { 773 /* it was, fish back the full termcap */ 774 sscanf(zz, "%p", &ext_tc); 775 if ((newptr = (char *) realloc(termbuf, 776 strlen(ext_tc) + 1)) 777 == NULL) { 778 goto error; 779 } 780 781 strcpy(newptr, ext_tc); 782 termbuf = newptr; 783 } 784 785 if (errp) 786 *errp = 1; 787 return(0); 788 } 789 error: 790 if (errp) 791 *errp = 0; 792 return(-1); 793 } 794 #else 795 #define termbuf ttytype 796 extern char ttytype[]; 797 #endif 798 799 int resettermname = 1; 800 801 char * 802 gettermname() 803 { 804 char *tname; 805 static char **tnamep = 0; 806 static char **next; 807 int err; 808 809 if (resettermname) { 810 resettermname = 0; 811 if (tnamep && tnamep != unknown) 812 free(tnamep); 813 if ((tname = (char *)env_getvalue((unsigned char *)"TERM")) && 814 (setup_term(tname, 1, &err) == 0)) { 815 tnamep = mklist(termbuf, tname); 816 } else { 817 if (tname && ((int)strlen(tname) <= 40)) { 818 unknown[0] = tname; 819 upcase(tname); 820 } else 821 unknown[0] = name_unknown; 822 tnamep = unknown; 823 } 824 next = tnamep; 825 } 826 if (*next == 0) 827 next = tnamep; 828 return(*next++); 829 } 830 /* 831 * suboption() 832 * 833 * Look at the sub-option buffer, and try to be helpful to the other 834 * side. 835 * 836 * Currently we recognize: 837 * 838 * Terminal type, send request. 839 * Terminal speed (send request). 840 * Local flow control (is request). 841 * Linemode 842 */ 843 844 static void 845 suboption() 846 { 847 unsigned char subchar; 848 849 printsub('<', subbuffer, SB_LEN()+2); 850 switch (subchar = SB_GET()) { 851 case TELOPT_TTYPE: 852 if (my_want_state_is_wont(TELOPT_TTYPE)) 853 return; 854 if (SB_EOF() || SB_GET() != TELQUAL_SEND) { 855 return; 856 } else { 857 char *name; 858 unsigned char temp[50]; 859 int len; 860 861 #if defined(TN3270) 862 if (tn3270_ttype()) { 863 return; 864 } 865 #endif /* defined(TN3270) */ 866 name = gettermname(); 867 len = strlen(name) + 4 + 2; 868 if (len < NETROOM()) { 869 sprintf((char *)temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE, 870 TELQUAL_IS, name, IAC, SE); 871 ring_supply_data(&netoring, temp, len); 872 printsub('>', &temp[2], len-2); 873 } else { 874 ExitString("No room in buffer for terminal type.\n", 1); 875 /*NOTREACHED*/ 876 } 877 } 878 break; 879 case TELOPT_TSPEED: 880 if (my_want_state_is_wont(TELOPT_TSPEED)) 881 return; 882 if (SB_EOF()) 883 return; 884 if (SB_GET() == TELQUAL_SEND) { 885 long ospeed, ispeed; 886 unsigned char temp[50]; 887 int len; 888 889 TerminalSpeeds(&ispeed, &ospeed); 890 891 sprintf((char *)temp, "%c%c%c%c%ld,%ld%c%c", IAC, SB, TELOPT_TSPEED, 892 TELQUAL_IS, (long)ospeed, (long)ispeed, IAC, SE); 893 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 894 895 if (len < NETROOM()) { 896 ring_supply_data(&netoring, temp, len); 897 printsub('>', temp+2, len - 2); 898 } 899 /*@*/ else printf("lm_will: not enough room in buffer\n"); 900 } 901 break; 902 case TELOPT_LFLOW: 903 if (my_want_state_is_wont(TELOPT_LFLOW)) 904 return; 905 if (SB_EOF()) 906 return; 907 switch(SB_GET()) { 908 case LFLOW_RESTART_ANY: 909 restartany = 1; 910 break; 911 case LFLOW_RESTART_XON: 912 restartany = 0; 913 break; 914 case LFLOW_ON: 915 localflow = 1; 916 break; 917 case LFLOW_OFF: 918 localflow = 0; 919 break; 920 default: 921 return; 922 } 923 setcommandmode(); 924 setconnmode(0); 925 break; 926 927 case TELOPT_LINEMODE: 928 if (my_want_state_is_wont(TELOPT_LINEMODE)) 929 return; 930 if (SB_EOF()) 931 return; 932 switch (SB_GET()) { 933 case WILL: 934 lm_will(subpointer, SB_LEN()); 935 break; 936 case WONT: 937 lm_wont(subpointer, SB_LEN()); 938 break; 939 case DO: 940 lm_do(subpointer, SB_LEN()); 941 break; 942 case DONT: 943 lm_dont(subpointer, SB_LEN()); 944 break; 945 case LM_SLC: 946 slc(subpointer, SB_LEN()); 947 break; 948 case LM_MODE: 949 lm_mode(subpointer, SB_LEN(), 0); 950 break; 951 default: 952 break; 953 } 954 break; 955 956 #ifdef OLD_ENVIRON 957 case TELOPT_OLD_ENVIRON: 958 #endif 959 case TELOPT_NEW_ENVIRON: 960 if (SB_EOF()) 961 return; 962 switch(SB_PEEK()) { 963 case TELQUAL_IS: 964 case TELQUAL_INFO: 965 if (my_want_state_is_dont(subchar)) 966 return; 967 break; 968 case TELQUAL_SEND: 969 if (my_want_state_is_wont(subchar)) { 970 return; 971 } 972 break; 973 default: 974 return; 975 } 976 env_opt(subpointer, SB_LEN()); 977 break; 978 979 case TELOPT_XDISPLOC: 980 if (my_want_state_is_wont(TELOPT_XDISPLOC)) 981 return; 982 if (SB_EOF()) 983 return; 984 if (SB_GET() == TELQUAL_SEND) { 985 unsigned char temp[50], *dp; 986 int len; 987 988 if ((dp = env_getvalue((unsigned char *)"DISPLAY")) == NULL) { 989 /* 990 * Something happened, we no longer have a DISPLAY 991 * variable. So, turn off the option. 992 */ 993 send_wont(TELOPT_XDISPLOC, 1); 994 break; 995 } 996 sprintf((char *)temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_XDISPLOC, 997 TELQUAL_IS, dp, IAC, SE); 998 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 999 1000 if (len < NETROOM()) { 1001 ring_supply_data(&netoring, temp, len); 1002 printsub('>', temp+2, len - 2); 1003 } 1004 /*@*/ else printf("lm_will: not enough room in buffer\n"); 1005 } 1006 break; 1007 1008 #if defined(AUTHENTICATION) 1009 case TELOPT_AUTHENTICATION: { 1010 if (!autologin) 1011 break; 1012 if (SB_EOF()) 1013 return; 1014 switch(SB_GET()) { 1015 case TELQUAL_IS: 1016 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 1017 return; 1018 auth_is(subpointer, SB_LEN()); 1019 break; 1020 case TELQUAL_SEND: 1021 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 1022 return; 1023 auth_send(subpointer, SB_LEN()); 1024 break; 1025 case TELQUAL_REPLY: 1026 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 1027 return; 1028 auth_reply(subpointer, SB_LEN()); 1029 break; 1030 case TELQUAL_NAME: 1031 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 1032 return; 1033 auth_name(subpointer, SB_LEN()); 1034 break; 1035 } 1036 } 1037 break; 1038 #endif 1039 default: 1040 break; 1041 } 1042 } 1043 1044 static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE }; 1045 1046 void 1047 lm_will(cmd, len) 1048 unsigned char *cmd; 1049 int len; 1050 { 1051 if (len < 1) { 1052 /*@*/ printf("lm_will: no command!!!\n"); /* Should not happen... */ 1053 return; 1054 } 1055 switch(cmd[0]) { 1056 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 1057 default: 1058 str_lm[3] = DONT; 1059 str_lm[4] = cmd[0]; 1060 if (NETROOM() > sizeof(str_lm)) { 1061 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 1062 printsub('>', &str_lm[2], sizeof(str_lm)-2); 1063 } 1064 /*@*/ else printf("lm_will: not enough room in buffer\n"); 1065 break; 1066 } 1067 } 1068 1069 void 1070 lm_wont(cmd, len) 1071 unsigned char *cmd; 1072 int len; 1073 { 1074 if (len < 1) { 1075 /*@*/ printf("lm_wont: no command!!!\n"); /* Should not happen... */ 1076 return; 1077 } 1078 switch(cmd[0]) { 1079 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 1080 default: 1081 /* We are always DONT, so don't respond */ 1082 return; 1083 } 1084 } 1085 1086 void 1087 lm_do(cmd, len) 1088 unsigned char *cmd; 1089 int len; 1090 { 1091 if (len < 1) { 1092 /*@*/ printf("lm_do: no command!!!\n"); /* Should not happen... */ 1093 return; 1094 } 1095 switch(cmd[0]) { 1096 case LM_FORWARDMASK: 1097 default: 1098 str_lm[3] = WONT; 1099 str_lm[4] = cmd[0]; 1100 if (NETROOM() > sizeof(str_lm)) { 1101 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 1102 printsub('>', &str_lm[2], sizeof(str_lm)-2); 1103 } 1104 /*@*/ else printf("lm_do: not enough room in buffer\n"); 1105 break; 1106 } 1107 } 1108 1109 void 1110 lm_dont(cmd, len) 1111 unsigned char *cmd; 1112 int len; 1113 { 1114 if (len < 1) { 1115 /*@*/ printf("lm_dont: no command!!!\n"); /* Should not happen... */ 1116 return; 1117 } 1118 switch(cmd[0]) { 1119 case LM_FORWARDMASK: 1120 default: 1121 /* we are always WONT, so don't respond */ 1122 break; 1123 } 1124 } 1125 1126 static unsigned char str_lm_mode[] = { 1127 IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE 1128 }; 1129 1130 void 1131 lm_mode(cmd, len, init) 1132 unsigned char *cmd; 1133 int len, init; 1134 { 1135 if (len != 1) 1136 return; 1137 if ((linemode&MODE_MASK&~MODE_ACK) == *cmd) 1138 return; 1139 if (*cmd&MODE_ACK) 1140 return; 1141 linemode = *cmd&(MODE_MASK&~MODE_ACK); 1142 str_lm_mode[4] = linemode; 1143 if (!init) 1144 str_lm_mode[4] |= MODE_ACK; 1145 if (NETROOM() > sizeof(str_lm_mode)) { 1146 ring_supply_data(&netoring, str_lm_mode, sizeof(str_lm_mode)); 1147 printsub('>', &str_lm_mode[2], sizeof(str_lm_mode)-2); 1148 } 1149 /*@*/ else printf("lm_mode: not enough room in buffer\n"); 1150 setconnmode(0); /* set changed mode */ 1151 } 1152 1153 1154 1156 /* 1157 * slc() 1158 * Handle special character suboption of LINEMODE. 1159 */ 1160 1161 struct spc { 1162 cc_t val; 1163 cc_t *valp; 1164 char flags; /* Current flags & level */ 1165 char mylevel; /* Maximum level & flags */ 1166 } spc_data[NSLC+1]; 1167 1168 #define SLC_IMPORT 0 1169 #define SLC_EXPORT 1 1170 #define SLC_RVALUE 2 1171 static int slc_mode = SLC_EXPORT; 1172 1173 void 1174 slc_init() 1175 { 1176 register struct spc *spcp; 1177 1178 localchars = 1; 1179 for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) { 1180 spcp->val = 0; 1181 spcp->valp = 0; 1182 spcp->flags = spcp->mylevel = SLC_NOSUPPORT; 1183 } 1184 1185 #define initfunc(func, flags) { \ 1186 spcp = &spc_data[func]; \ 1187 if ((spcp->valp = tcval(func)) != NULL){ \ 1188 spcp->val = *spcp->valp; \ 1189 spcp->mylevel = SLC_VARIABLE|flags; \ 1190 } else { \ 1191 spcp->val = 0; \ 1192 spcp->mylevel = SLC_DEFAULT; \ 1193 } \ 1194 } 1195 1196 initfunc(SLC_SYNCH, 0); 1197 /* No BRK */ 1198 initfunc(SLC_AO, 0); 1199 initfunc(SLC_AYT, 0); 1200 /* No EOR */ 1201 initfunc(SLC_ABORT, SLC_FLUSHIN|SLC_FLUSHOUT); 1202 initfunc(SLC_EOF, 0); 1203 #ifndef SYSV_TERMIO 1204 initfunc(SLC_SUSP, SLC_FLUSHIN); 1205 #endif 1206 initfunc(SLC_EC, 0); 1207 initfunc(SLC_EL, 0); 1208 #ifndef SYSV_TERMIO 1209 initfunc(SLC_EW, 0); 1210 initfunc(SLC_RP, 0); 1211 initfunc(SLC_LNEXT, 0); 1212 #endif 1213 initfunc(SLC_XON, 0); 1214 initfunc(SLC_XOFF, 0); 1215 #ifdef SYSV_TERMIO 1216 spc_data[SLC_XON].mylevel = SLC_CANTCHANGE; 1217 spc_data[SLC_XOFF].mylevel = SLC_CANTCHANGE; 1218 #endif 1219 initfunc(SLC_FORW1, 0); 1220 #ifdef USE_TERMIO 1221 initfunc(SLC_FORW2, 0); 1222 /* No FORW2 */ 1223 #endif 1224 1225 initfunc(SLC_IP, SLC_FLUSHIN|SLC_FLUSHOUT); 1226 #undef initfunc 1227 1228 if (slc_mode == SLC_EXPORT) 1229 slc_export(); 1230 else 1231 slc_import(1); 1232 1233 } 1234 1235 void 1236 slcstate() 1237 { 1238 printf("Special characters are %s values\n", 1239 slc_mode == SLC_IMPORT ? "remote default" : 1240 slc_mode == SLC_EXPORT ? "local" : 1241 "remote"); 1242 } 1243 1244 void 1245 slc_mode_export(n) 1246 int n; 1247 { 1248 slc_mode = SLC_EXPORT; 1249 if (my_state_is_will(TELOPT_LINEMODE)) 1250 slc_export(); 1251 } 1252 1253 void 1254 slc_mode_import(def) 1255 int def; 1256 { 1257 slc_mode = def ? SLC_IMPORT : SLC_RVALUE; 1258 if (my_state_is_will(TELOPT_LINEMODE)) 1259 slc_import(def); 1260 } 1261 1262 unsigned char slc_import_val[] = { 1263 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE 1264 }; 1265 unsigned char slc_import_def[] = { 1266 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE 1267 }; 1268 1269 void 1270 slc_import(def) 1271 int def; 1272 { 1273 if (NETROOM() > sizeof(slc_import_val)) { 1274 if (def) { 1275 ring_supply_data(&netoring, slc_import_def, sizeof(slc_import_def)); 1276 printsub('>', &slc_import_def[2], sizeof(slc_import_def)-2); 1277 } else { 1278 ring_supply_data(&netoring, slc_import_val, sizeof(slc_import_val)); 1279 printsub('>', &slc_import_val[2], sizeof(slc_import_val)-2); 1280 } 1281 } 1282 /*@*/ else printf("slc_import: not enough room\n"); 1283 } 1284 1285 void 1286 slc_export() 1287 { 1288 register struct spc *spcp; 1289 1290 TerminalDefaultChars(); 1291 1292 slc_start_reply(); 1293 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1294 if (spcp->mylevel != SLC_NOSUPPORT) { 1295 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1296 spcp->flags = SLC_NOSUPPORT; 1297 else 1298 spcp->flags = spcp->mylevel; 1299 if (spcp->valp) 1300 spcp->val = *spcp->valp; 1301 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1302 } 1303 } 1304 slc_end_reply(); 1305 (void)slc_update(); 1306 setconnmode(1); /* Make sure the character values are set */ 1307 } 1308 1309 void 1310 slc(cp, len) 1311 register unsigned char *cp; 1312 int len; 1313 { 1314 register struct spc *spcp; 1315 register int func,level; 1316 1317 slc_start_reply(); 1318 1319 for (; len >= 3; len -=3, cp +=3) { 1320 1321 func = cp[SLC_FUNC]; 1322 1323 if (func == 0) { 1324 /* 1325 * Client side: always ignore 0 function. 1326 */ 1327 continue; 1328 } 1329 if (func > NSLC) { 1330 if ((cp[SLC_FLAGS] & SLC_LEVELBITS) != SLC_NOSUPPORT) 1331 slc_add_reply(func, SLC_NOSUPPORT, 0); 1332 continue; 1333 } 1334 1335 spcp = &spc_data[func]; 1336 1337 level = cp[SLC_FLAGS]&(SLC_LEVELBITS|SLC_ACK); 1338 1339 if ((cp[SLC_VALUE] == (unsigned char)spcp->val) && 1340 ((level&SLC_LEVELBITS) == (spcp->flags&SLC_LEVELBITS))) { 1341 continue; 1342 } 1343 1344 if (level == (SLC_DEFAULT|SLC_ACK)) { 1345 /* 1346 * This is an error condition, the SLC_ACK 1347 * bit should never be set for the SLC_DEFAULT 1348 * level. Our best guess to recover is to 1349 * ignore the SLC_ACK bit. 1350 */ 1351 cp[SLC_FLAGS] &= ~SLC_ACK; 1352 } 1353 1354 if (level == ((spcp->flags&SLC_LEVELBITS)|SLC_ACK)) { 1355 spcp->val = (cc_t)cp[SLC_VALUE]; 1356 spcp->flags = cp[SLC_FLAGS]; /* include SLC_ACK */ 1357 continue; 1358 } 1359 1360 level &= ~SLC_ACK; 1361 1362 if (level <= (spcp->mylevel&SLC_LEVELBITS)) { 1363 spcp->flags = cp[SLC_FLAGS]|SLC_ACK; 1364 spcp->val = (cc_t)cp[SLC_VALUE]; 1365 } 1366 if (level == SLC_DEFAULT) { 1367 if ((spcp->mylevel&SLC_LEVELBITS) != SLC_DEFAULT) 1368 spcp->flags = spcp->mylevel; 1369 else 1370 spcp->flags = SLC_NOSUPPORT; 1371 } 1372 slc_add_reply(func, spcp->flags, spcp->val); 1373 } 1374 slc_end_reply(); 1375 if (slc_update()) 1376 setconnmode(1); /* set the new character values */ 1377 } 1378 1379 void 1380 slc_check() 1381 { 1382 register struct spc *spcp; 1383 1384 slc_start_reply(); 1385 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1386 if (spcp->valp && spcp->val != *spcp->valp) { 1387 spcp->val = *spcp->valp; 1388 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1389 spcp->flags = SLC_NOSUPPORT; 1390 else 1391 spcp->flags = spcp->mylevel; 1392 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1393 } 1394 } 1395 slc_end_reply(); 1396 setconnmode(1); 1397 } 1398 1399 1400 unsigned char slc_reply[128]; 1401 unsigned char *slc_replyp; 1402 1403 void 1404 slc_start_reply() 1405 { 1406 slc_replyp = slc_reply; 1407 *slc_replyp++ = IAC; 1408 *slc_replyp++ = SB; 1409 *slc_replyp++ = TELOPT_LINEMODE; 1410 *slc_replyp++ = LM_SLC; 1411 } 1412 1413 void 1414 slc_add_reply(func, flags, value) 1415 unsigned int func; 1416 unsigned int flags; 1417 cc_t value; 1418 { 1419 if ((*slc_replyp++ = func) == IAC) 1420 *slc_replyp++ = IAC; 1421 if ((*slc_replyp++ = flags) == IAC) 1422 *slc_replyp++ = IAC; 1423 if ((*slc_replyp++ = (unsigned char)value) == IAC) 1424 *slc_replyp++ = IAC; 1425 } 1426 1427 void 1428 slc_end_reply() 1429 { 1430 register int len; 1431 1432 *slc_replyp++ = IAC; 1433 *slc_replyp++ = SE; 1434 len = slc_replyp - slc_reply; 1435 if (len <= 6) 1436 return; 1437 if (NETROOM() > len) { 1438 ring_supply_data(&netoring, slc_reply, slc_replyp - slc_reply); 1439 printsub('>', &slc_reply[2], slc_replyp - slc_reply - 2); 1440 } 1441 /*@*/else printf("slc_end_reply: not enough room\n"); 1442 } 1443 1444 int 1445 slc_update() 1446 { 1447 register struct spc *spcp; 1448 int need_update = 0; 1449 1450 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1451 if (!(spcp->flags&SLC_ACK)) 1452 continue; 1453 spcp->flags &= ~SLC_ACK; 1454 if (spcp->valp && (*spcp->valp != spcp->val)) { 1455 *spcp->valp = spcp->val; 1456 need_update = 1; 1457 } 1458 } 1459 return(need_update); 1460 } 1461 1462 #ifdef OLD_ENVIRON 1463 # ifdef ENV_HACK 1464 /* 1465 * Earlier version of telnet/telnetd from the BSD code had 1466 * the definitions of VALUE and VAR reversed. To ensure 1467 * maximum interoperability, we assume that the server is 1468 * an older BSD server, until proven otherwise. The newer 1469 * BSD servers should be able to handle either definition, 1470 * so it is better to use the wrong values if we don't 1471 * know what type of server it is. 1472 */ 1473 int env_auto = 1; 1474 int old_env_var = OLD_ENV_VAR; 1475 int old_env_value = OLD_ENV_VALUE; 1476 # else 1477 # define old_env_var OLD_ENV_VAR 1478 # define old_env_value OLD_ENV_VALUE 1479 # endif 1480 #endif 1481 1482 void 1483 env_opt(buf, len) 1484 register unsigned char *buf; 1485 register int len; 1486 { 1487 register unsigned char *ep = 0, *epc = 0; 1488 register int i; 1489 1490 switch(buf[0]&0xff) { 1491 case TELQUAL_SEND: 1492 env_opt_start(); 1493 if (len == 1) { 1494 env_opt_add(NULL); 1495 } else for (i = 1; i < len; i++) { 1496 switch (buf[i]&0xff) { 1497 #ifdef OLD_ENVIRON 1498 case OLD_ENV_VAR: 1499 # ifdef ENV_HACK 1500 if (telopt_environ == TELOPT_OLD_ENVIRON 1501 && env_auto) { 1502 /* Server has the same definitions */ 1503 old_env_var = OLD_ENV_VAR; 1504 old_env_value = OLD_ENV_VALUE; 1505 } 1506 /* FALL THROUGH */ 1507 # endif 1508 case OLD_ENV_VALUE: 1509 /* 1510 * Although OLD_ENV_VALUE is not legal, we will 1511 * still recognize it, just in case it is an 1512 * old server that has VAR & VALUE mixed up... 1513 */ 1514 /* FALL THROUGH */ 1515 #else 1516 case NEW_ENV_VAR: 1517 #endif 1518 case ENV_USERVAR: 1519 if (ep) { 1520 *epc = 0; 1521 env_opt_add(ep); 1522 } 1523 ep = epc = &buf[i+1]; 1524 break; 1525 case ENV_ESC: 1526 i++; 1527 /*FALL THROUGH*/ 1528 default: 1529 if (epc) 1530 *epc++ = buf[i]; 1531 break; 1532 } 1533 } 1534 if (ep) { 1535 *epc = 0; 1536 env_opt_add(ep); 1537 } 1538 env_opt_end(1); 1539 break; 1540 1541 case TELQUAL_IS: 1542 case TELQUAL_INFO: 1543 /* Ignore for now. We shouldn't get it anyway. */ 1544 break; 1545 1546 default: 1547 break; 1548 } 1549 } 1550 1551 #define OPT_REPLY_SIZE 256 1552 unsigned char *opt_reply; 1553 unsigned char *opt_replyp; 1554 unsigned char *opt_replyend; 1555 1556 void 1557 env_opt_start() 1558 { 1559 unsigned char *p; 1560 1561 if (opt_reply) { 1562 p = (unsigned char *)realloc(opt_reply, OPT_REPLY_SIZE); 1563 if (p == NULL) 1564 free(opt_reply); 1565 } else 1566 p = (unsigned char *)malloc(OPT_REPLY_SIZE); 1567 opt_reply = p; 1568 if (opt_reply == NULL) { 1569 /*@*/ printf("env_opt_start: malloc()/realloc() failed!!!\n"); 1570 opt_reply = opt_replyp = opt_replyend = NULL; 1571 return; 1572 } 1573 opt_replyp = opt_reply; 1574 opt_replyend = opt_reply + OPT_REPLY_SIZE; 1575 *opt_replyp++ = IAC; 1576 *opt_replyp++ = SB; 1577 *opt_replyp++ = telopt_environ; 1578 *opt_replyp++ = TELQUAL_IS; 1579 } 1580 1581 void 1582 env_opt_start_info() 1583 { 1584 env_opt_start(); 1585 if (opt_replyp) 1586 opt_replyp[-1] = TELQUAL_INFO; 1587 } 1588 1589 void 1590 env_opt_add(ep) 1591 register unsigned char *ep; 1592 { 1593 register unsigned char *vp, c; 1594 1595 if (opt_reply == NULL) /*XXX*/ 1596 return; /*XXX*/ 1597 1598 if (ep == NULL || *ep == '\0') { 1599 /* Send user defined variables first. */ 1600 env_default(1, 0); 1601 while ((ep = env_default(0, 0)) != NULL) 1602 env_opt_add(ep); 1603 1604 /* Now add the list of well know variables. */ 1605 env_default(1, 1); 1606 while ((ep = env_default(0, 1)) != NULL) 1607 env_opt_add(ep); 1608 return; 1609 } 1610 vp = env_getvalue(ep); 1611 if (opt_replyp + (vp ? strlen((char *)vp) : 0) + 1612 strlen((char *)ep) + 6 > opt_replyend) 1613 { 1614 register int len; 1615 unsigned char *p; 1616 opt_replyend += OPT_REPLY_SIZE; 1617 len = opt_replyend - opt_reply; 1618 p = (unsigned char *)realloc(opt_reply, len); 1619 if (p == NULL) 1620 free(opt_reply); 1621 opt_reply = p; 1622 if (opt_reply == NULL) { 1623 /*@*/ printf("env_opt_add: realloc() failed!!!\n"); 1624 opt_reply = opt_replyp = opt_replyend = NULL; 1625 return; 1626 } 1627 opt_replyp = opt_reply + len - (opt_replyend - opt_replyp); 1628 opt_replyend = opt_reply + len; 1629 } 1630 if (opt_welldefined(ep)) 1631 #ifdef OLD_ENVIRON 1632 if (telopt_environ == TELOPT_OLD_ENVIRON) 1633 *opt_replyp++ = old_env_var; 1634 else 1635 #endif 1636 *opt_replyp++ = NEW_ENV_VAR; 1637 else 1638 *opt_replyp++ = ENV_USERVAR; 1639 for (;;) { 1640 while ((c = *ep++) != '\0') { 1641 switch(c&0xff) { 1642 case IAC: 1643 *opt_replyp++ = IAC; 1644 break; 1645 case NEW_ENV_VAR: 1646 case NEW_ENV_VALUE: 1647 case ENV_ESC: 1648 case ENV_USERVAR: 1649 *opt_replyp++ = ENV_ESC; 1650 break; 1651 } 1652 *opt_replyp++ = c; 1653 } 1654 if ((ep = vp) != NULL) { 1655 #ifdef OLD_ENVIRON 1656 if (telopt_environ == TELOPT_OLD_ENVIRON) 1657 *opt_replyp++ = old_env_value; 1658 else 1659 #endif 1660 *opt_replyp++ = NEW_ENV_VALUE; 1661 vp = NULL; 1662 } else 1663 break; 1664 } 1665 } 1666 1667 int 1668 opt_welldefined(ep) 1669 char *ep; 1670 { 1671 if ((strcmp(ep, "USER") == 0) || 1672 (strcmp(ep, "DISPLAY") == 0) || 1673 (strcmp(ep, "PRINTER") == 0) || 1674 (strcmp(ep, "SYSTEMTYPE") == 0) || 1675 (strcmp(ep, "JOB") == 0) || 1676 (strcmp(ep, "ACCT") == 0)) 1677 return(1); 1678 return(0); 1679 } 1680 void 1681 env_opt_end(emptyok) 1682 register int emptyok; 1683 { 1684 register int len; 1685 1686 len = opt_replyp - opt_reply + 2; 1687 if (emptyok || len > 6) { 1688 *opt_replyp++ = IAC; 1689 *opt_replyp++ = SE; 1690 if (NETROOM() > len) { 1691 ring_supply_data(&netoring, opt_reply, len); 1692 printsub('>', &opt_reply[2], len - 2); 1693 } 1694 /*@*/ else printf("slc_end_reply: not enough room\n"); 1695 } 1696 if (opt_reply) { 1697 free(opt_reply); 1698 opt_reply = opt_replyp = opt_replyend = NULL; 1699 } 1700 } 1701 1702 1703 1705 int 1706 telrcv() 1707 { 1708 register int c; 1709 register int scc; 1710 register unsigned char *sbp = NULL; 1711 int count; 1712 int returnValue = 0; 1713 1714 scc = 0; 1715 count = 0; 1716 while (TTYROOM() > 2) { 1717 if (scc == 0) { 1718 if (count) { 1719 ring_consumed(&netiring, count); 1720 returnValue = 1; 1721 count = 0; 1722 } 1723 sbp = netiring.consume; 1724 scc = ring_full_consecutive(&netiring); 1725 if (scc == 0) { 1726 /* No more data coming in */ 1727 break; 1728 } 1729 } 1730 1731 c = *sbp++ & 0xff, scc--; count++; 1732 1733 switch (telrcv_state) { 1734 1735 case TS_CR: 1736 telrcv_state = TS_DATA; 1737 if (c == '\0') { 1738 break; /* Ignore \0 after CR */ 1739 } 1740 else if ((c == '\n') && my_want_state_is_dont(TELOPT_ECHO) && !crmod) { 1741 TTYADD(c); 1742 break; 1743 } 1744 /* Else, fall through */ 1745 1746 case TS_DATA: 1747 if (c == IAC) { 1748 telrcv_state = TS_IAC; 1749 break; 1750 } 1751 # if defined(TN3270) 1752 if (In3270) { 1753 *Ifrontp++ = c; 1754 while (scc > 0) { 1755 c = *sbp++ & 0377, scc--; count++; 1756 if (c == IAC) { 1757 telrcv_state = TS_IAC; 1758 break; 1759 } 1760 *Ifrontp++ = c; 1761 } 1762 } else 1763 # endif /* defined(TN3270) */ 1764 /* 1765 * The 'crmod' hack (see following) is needed 1766 * since we can't * set CRMOD on output only. 1767 * Machines like MULTICS like to send \r without 1768 * \n; since we must turn off CRMOD to get proper 1769 * input, the mapping is done here (sigh). 1770 */ 1771 if ((c == '\r') && my_want_state_is_dont(TELOPT_BINARY)) { 1772 if (scc > 0) { 1773 c = *sbp&0xff; 1774 if (c == 0) { 1775 sbp++, scc--; count++; 1776 /* a "true" CR */ 1777 TTYADD('\r'); 1778 } else if (my_want_state_is_dont(TELOPT_ECHO) && 1779 (c == '\n')) { 1780 sbp++, scc--; count++; 1781 TTYADD('\n'); 1782 } else { 1783 1784 TTYADD('\r'); 1785 if (crmod) { 1786 TTYADD('\n'); 1787 } 1788 } 1789 } else { 1790 telrcv_state = TS_CR; 1791 TTYADD('\r'); 1792 if (crmod) { 1793 TTYADD('\n'); 1794 } 1795 } 1796 } else { 1797 TTYADD(c); 1798 } 1799 continue; 1800 1801 case TS_IAC: 1802 process_iac: 1803 switch (c) { 1804 1805 case WILL: 1806 telrcv_state = TS_WILL; 1807 continue; 1808 1809 case WONT: 1810 telrcv_state = TS_WONT; 1811 continue; 1812 1813 case DO: 1814 telrcv_state = TS_DO; 1815 continue; 1816 1817 case DONT: 1818 telrcv_state = TS_DONT; 1819 continue; 1820 1821 case DM: 1822 /* 1823 * We may have missed an urgent notification, 1824 * so make sure we flush whatever is in the 1825 * buffer currently. 1826 */ 1827 printoption("RCVD", IAC, DM); 1828 SYNCHing = 1; 1829 (void) ttyflush(1); 1830 SYNCHing = stilloob(); 1831 settimer(gotDM); 1832 break; 1833 1834 case SB: 1835 SB_CLEAR(); 1836 telrcv_state = TS_SB; 1837 continue; 1838 1839 # if defined(TN3270) 1840 case EOR: 1841 if (In3270) { 1842 if (Ibackp == Ifrontp) { 1843 Ibackp = Ifrontp = Ibuf; 1844 ISend = 0; /* should have been! */ 1845 } else { 1846 Ibackp += DataFromNetwork(Ibackp, Ifrontp-Ibackp, 1); 1847 ISend = 1; 1848 } 1849 } 1850 printoption("RCVD", IAC, EOR); 1851 break; 1852 # endif /* defined(TN3270) */ 1853 1854 case IAC: 1855 # if !defined(TN3270) 1856 TTYADD(IAC); 1857 # else /* !defined(TN3270) */ 1858 if (In3270) { 1859 *Ifrontp++ = IAC; 1860 } else { 1861 TTYADD(IAC); 1862 } 1863 # endif /* !defined(TN3270) */ 1864 break; 1865 1866 case NOP: 1867 case GA: 1868 default: 1869 printoption("RCVD", IAC, c); 1870 break; 1871 } 1872 telrcv_state = TS_DATA; 1873 continue; 1874 1875 case TS_WILL: 1876 printoption("RCVD", WILL, c); 1877 willoption(c); 1878 SetIn3270(); 1879 telrcv_state = TS_DATA; 1880 continue; 1881 1882 case TS_WONT: 1883 printoption("RCVD", WONT, c); 1884 wontoption(c); 1885 SetIn3270(); 1886 telrcv_state = TS_DATA; 1887 continue; 1888 1889 case TS_DO: 1890 printoption("RCVD", DO, c); 1891 dooption(c); 1892 SetIn3270(); 1893 if (c == TELOPT_NAWS) { 1894 sendnaws(); 1895 } else if (c == TELOPT_LFLOW) { 1896 localflow = 1; 1897 setcommandmode(); 1898 setconnmode(0); 1899 } 1900 telrcv_state = TS_DATA; 1901 continue; 1902 1903 case TS_DONT: 1904 printoption("RCVD", DONT, c); 1905 dontoption(c); 1906 flushline = 1; 1907 setconnmode(0); /* set new tty mode (maybe) */ 1908 SetIn3270(); 1909 telrcv_state = TS_DATA; 1910 continue; 1911 1912 case TS_SB: 1913 if (c == IAC) { 1914 telrcv_state = TS_SE; 1915 } else { 1916 SB_ACCUM(c); 1917 } 1918 continue; 1919 1920 case TS_SE: 1921 if (c != SE) { 1922 if (c != IAC) { 1923 /* 1924 * This is an error. We only expect to get 1925 * "IAC IAC" or "IAC SE". Several things may 1926 * have happend. An IAC was not doubled, the 1927 * IAC SE was left off, or another option got 1928 * inserted into the suboption are all possibilities. 1929 * If we assume that the IAC was not doubled, 1930 * and really the IAC SE was left off, we could 1931 * get into an infinate loop here. So, instead, 1932 * we terminate the suboption, and process the 1933 * partial suboption if we can. 1934 */ 1935 SB_ACCUM(IAC); 1936 SB_ACCUM(c); 1937 subpointer -= 2; 1938 SB_TERM(); 1939 1940 printoption("In SUBOPTION processing, RCVD", IAC, c); 1941 suboption(); /* handle sub-option */ 1942 SetIn3270(); 1943 telrcv_state = TS_IAC; 1944 goto process_iac; 1945 } 1946 SB_ACCUM(c); 1947 telrcv_state = TS_SB; 1948 } else { 1949 SB_ACCUM(IAC); 1950 SB_ACCUM(SE); 1951 subpointer -= 2; 1952 SB_TERM(); 1953 suboption(); /* handle sub-option */ 1954 SetIn3270(); 1955 telrcv_state = TS_DATA; 1956 } 1957 } 1958 } 1959 if (count) 1960 ring_consumed(&netiring, count); 1961 return returnValue||count; 1962 } 1963 1964 static int bol = 1, local = 0; 1965 1966 int 1967 rlogin_susp() 1968 { 1969 if (local) { 1970 local = 0; 1971 bol = 1; 1972 command(0, "z\n", 2); 1973 return(1); 1974 } 1975 return(0); 1976 } 1977 1978 static int 1979 telsnd() 1980 { 1981 int tcc; 1982 int count; 1983 int returnValue = 0; 1984 unsigned char *tbp = NULL; 1985 1986 tcc = 0; 1987 count = 0; 1988 while (NETROOM() > 2) { 1989 register int sc; 1990 register int c; 1991 1992 if (tcc == 0) { 1993 if (count) { 1994 ring_consumed(&ttyiring, count); 1995 returnValue = 1; 1996 count = 0; 1997 } 1998 tbp = ttyiring.consume; 1999 tcc = ring_full_consecutive(&ttyiring); 2000 if (tcc == 0) { 2001 break; 2002 } 2003 } 2004 c = *tbp++ & 0xff, sc = strip(c), tcc--; count++; 2005 if (rlogin != _POSIX_VDISABLE) { 2006 if (bol) { 2007 bol = 0; 2008 if (sc == rlogin) { 2009 local = 1; 2010 continue; 2011 } 2012 } else if (local) { 2013 local = 0; 2014 if (sc == '.' || c == termEofChar) { 2015 bol = 1; 2016 command(0, "close\n", 6); 2017 continue; 2018 } 2019 if (sc == termSuspChar) { 2020 bol = 1; 2021 command(0, "z\n", 2); 2022 continue; 2023 } 2024 if (sc == escape) { 2025 command(0, (char *)tbp, tcc); 2026 bol = 1; 2027 count += tcc; 2028 tcc = 0; 2029 flushline = 1; 2030 break; 2031 } 2032 if (sc != rlogin) { 2033 ++tcc; 2034 --tbp; 2035 --count; 2036 c = sc = rlogin; 2037 } 2038 } 2039 if ((sc == '\n') || (sc == '\r')) 2040 bol = 1; 2041 } else if (sc == escape && escape != _POSIX_VDISABLE) { 2042 /* 2043 * Double escape is a pass through of a single escape character. 2044 */ 2045 if (tcc && strip(*tbp) == escape) { 2046 tbp++; 2047 tcc--; 2048 count++; 2049 bol = 0; 2050 } else { 2051 command(0, (char *)tbp, tcc); 2052 bol = 1; 2053 count += tcc; 2054 tcc = 0; 2055 flushline = 1; 2056 break; 2057 } 2058 } else 2059 bol = 0; 2060 #ifdef KLUDGELINEMODE 2061 if (kludgelinemode && (globalmode&MODE_EDIT) && (sc == echoc)) { 2062 if (tcc > 0 && strip(*tbp) == echoc) { 2063 tcc--; tbp++; count++; 2064 } else { 2065 dontlecho = !dontlecho; 2066 settimer(echotoggle); 2067 setconnmode(0); 2068 flushline = 1; 2069 break; 2070 } 2071 } 2072 #endif 2073 if (sc != _POSIX_VDISABLE && MODE_LOCAL_CHARS(globalmode)) { 2074 if (TerminalSpecialChars(sc) == 0) { 2075 bol = 1; 2076 break; 2077 } 2078 } 2079 if (my_want_state_is_wont(TELOPT_BINARY)) { 2080 switch (c) { 2081 case '\n': 2082 /* 2083 * If we are in CRMOD mode (\r ==> \n) 2084 * on our local machine, then probably 2085 * a newline (unix) is CRLF (TELNET). 2086 */ 2087 if (MODE_LOCAL_CHARS(globalmode)) { 2088 NETADD('\r'); 2089 } 2090 NETADD('\n'); 2091 bol = flushline = 1; 2092 break; 2093 case '\r': 2094 if (!crlf) { 2095 NET2ADD('\r', '\0'); 2096 } else { 2097 NET2ADD('\r', '\n'); 2098 } 2099 bol = flushline = 1; 2100 break; 2101 case IAC: 2102 NET2ADD(IAC, IAC); 2103 break; 2104 default: 2105 NETADD(c); 2106 break; 2107 } 2108 } else if (c == IAC) { 2109 NET2ADD(IAC, IAC); 2110 } else { 2111 NETADD(c); 2112 } 2113 } 2114 if (count) 2115 ring_consumed(&ttyiring, count); 2116 return returnValue||count; /* Non-zero if we did anything */ 2117 } 2118 2119 /* 2121 * Scheduler() 2122 * 2123 * Try to do something. 2124 * 2125 * If we do something useful, return 1; else return 0. 2126 * 2127 */ 2128 2129 2130 int 2131 Scheduler(block) 2132 int block; /* should we block in the select ? */ 2133 { 2134 /* One wants to be a bit careful about setting returnValue 2135 * to one, since a one implies we did some useful work, 2136 * and therefore probably won't be called to block next 2137 * time (TN3270 mode only). 2138 */ 2139 int returnValue; 2140 int netin, netout, netex, ttyin, ttyout; 2141 2142 /* Decide which rings should be processed */ 2143 2144 netout = ring_full_count(&netoring) && 2145 (flushline || 2146 (my_want_state_is_wont(TELOPT_LINEMODE) 2147 #ifdef KLUDGELINEMODE 2148 && (!kludgelinemode || my_want_state_is_do(TELOPT_SGA)) 2149 #endif 2150 ) || 2151 my_want_state_is_will(TELOPT_BINARY)); 2152 ttyout = ring_full_count(&ttyoring); 2153 2154 #if defined(TN3270) 2155 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0) && (shell_active == 0); 2156 #else /* defined(TN3270) */ 2157 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0); 2158 #endif /* defined(TN3270) */ 2159 2160 #if defined(TN3270) 2161 netin = ring_empty_count(&netiring); 2162 # else /* !defined(TN3270) */ 2163 netin = !ISend && ring_empty_count(&netiring); 2164 # endif /* !defined(TN3270) */ 2165 2166 netex = !SYNCHing; 2167 2168 /* If we have seen a signal recently, reset things */ 2169 # if defined(TN3270) && defined(unix) 2170 if (HaveInput) { 2171 HaveInput = 0; 2172 (void) signal(SIGIO, inputAvailable); 2173 } 2174 #endif /* defined(TN3270) && defined(unix) */ 2175 2176 /* Call to system code to process rings */ 2177 2178 returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block); 2179 2180 /* Now, look at the input rings, looking for work to do. */ 2181 2182 if (ring_full_count(&ttyiring)) { 2183 # if defined(TN3270) 2184 if (In3270) { 2185 int c; 2186 2187 c = DataFromTerminal(ttyiring.consume, 2188 ring_full_consecutive(&ttyiring)); 2189 if (c) { 2190 returnValue = 1; 2191 ring_consumed(&ttyiring, c); 2192 } 2193 } else { 2194 # endif /* defined(TN3270) */ 2195 returnValue |= telsnd(); 2196 # if defined(TN3270) 2197 } 2198 # endif /* defined(TN3270) */ 2199 } 2200 2201 if (ring_full_count(&netiring)) { 2202 # if !defined(TN3270) 2203 returnValue |= telrcv(); 2204 # else /* !defined(TN3270) */ 2205 returnValue = Push3270(); 2206 # endif /* !defined(TN3270) */ 2207 } 2208 return returnValue; 2209 } 2210 2211 /* 2213 * Select from tty and network... 2214 */ 2215 void 2216 telnet(user) 2217 const char *user; 2218 { 2219 sys_telnet_init(); 2220 2221 #if defined(AUTHENTICATION) 2222 { 2223 static char local_host[MAXHOSTNAMELEN + 1] = { 0 }; 2224 2225 if (!local_host[0]) { 2226 gethostname(local_host, sizeof(local_host)); 2227 local_host[sizeof(local_host)-1] = 0; 2228 } 2229 auth_encrypt_init(local_host, hostname, "TELNET", 0); 2230 auth_encrypt_user(user); 2231 } 2232 #endif /* defined(AUTHENTICATION) */ 2233 # if !defined(TN3270) 2234 if (telnetport) { 2235 #if defined(AUTHENTICATION) 2236 if (autologin) 2237 send_will(TELOPT_AUTHENTICATION, 1); 2238 #endif 2239 send_do(TELOPT_SGA, 1); 2240 send_will(TELOPT_TTYPE, 1); 2241 send_will(TELOPT_NAWS, 1); 2242 send_will(TELOPT_TSPEED, 1); 2243 send_will(TELOPT_LFLOW, 1); 2244 send_will(TELOPT_LINEMODE, 1); 2245 send_will(TELOPT_NEW_ENVIRON, 1); 2246 send_do(TELOPT_STATUS, 1); 2247 if (env_getvalue((unsigned char *)"DISPLAY")) 2248 send_will(TELOPT_XDISPLOC, 1); 2249 if (eight) 2250 tel_enter_binary(eight); 2251 } 2252 # endif /* !defined(TN3270) */ 2253 2254 # if !defined(TN3270) 2255 for (;;) { 2256 int schedValue; 2257 2258 while ((schedValue = Scheduler(0)) != 0) { 2259 if (schedValue == -1) { 2260 setcommandmode(); 2261 return; 2262 } 2263 } 2264 2265 if (Scheduler(1) == -1) { 2266 setcommandmode(); 2267 return; 2268 } 2269 } 2270 # else /* !defined(TN3270) */ 2271 for (;;) { 2272 int schedValue; 2273 2274 while (!In3270 && !shell_active) { 2275 if (Scheduler(1) == -1) { 2276 setcommandmode(); 2277 return; 2278 } 2279 } 2280 2281 while ((schedValue = Scheduler(0)) != 0) { 2282 if (schedValue == -1) { 2283 setcommandmode(); 2284 return; 2285 } 2286 } 2287 /* If there is data waiting to go out to terminal, don't 2288 * schedule any more data for the terminal. 2289 */ 2290 if (ring_full_count(&ttyoring)) { 2291 schedValue = 1; 2292 } else { 2293 if (shell_active) { 2294 if (shell_continue() == 0) { 2295 ConnectScreen(); 2296 } 2297 } else if (In3270) { 2298 schedValue = DoTerminalOutput(); 2299 } 2300 } 2301 if (schedValue && (shell_active == 0)) { 2302 if (Scheduler(1) == -1) { 2303 setcommandmode(); 2304 return; 2305 } 2306 } 2307 } 2308 # endif /* !defined(TN3270) */ 2309 } 2310 2311 #if 0 /* XXX - this not being in is a bug */ 2313 /* 2314 * nextitem() 2315 * 2316 * Return the address of the next "item" in the TELNET data 2317 * stream. This will be the address of the next character if 2318 * the current address is a user data character, or it will 2319 * be the address of the character following the TELNET command 2320 * if the current address is a TELNET IAC ("I Am a Command") 2321 * character. 2322 */ 2323 2324 static char * 2325 nextitem(current) 2326 char *current; 2327 { 2328 if ((*current&0xff) != IAC) { 2329 return current+1; 2330 } 2331 switch (*(current+1)&0xff) { 2332 case DO: 2333 case DONT: 2334 case WILL: 2335 case WONT: 2336 return current+3; 2337 case SB: /* loop forever looking for the SE */ 2338 { 2339 register char *look = current+2; 2340 2341 for (;;) { 2342 if ((*look++&0xff) == IAC) { 2343 if ((*look++&0xff) == SE) { 2344 return look; 2345 } 2346 } 2347 } 2348 } 2349 default: 2350 return current+2; 2351 } 2352 } 2353 #endif /* 0 */ 2354 2355 /* 2356 * netclear() 2357 * 2358 * We are about to do a TELNET SYNCH operation. Clear 2359 * the path to the network. 2360 * 2361 * Things are a bit tricky since we may have sent the first 2362 * byte or so of a previous TELNET command into the network. 2363 * So, we have to scan the network buffer from the beginning 2364 * until we are up to where we want to be. 2365 * 2366 * A side effect of what we do, just to keep things 2367 * simple, is to clear the urgent data pointer. The principal 2368 * caller should be setting the urgent data pointer AFTER calling 2369 * us in any case. 2370 */ 2371 2372 static void 2373 netclear() 2374 { 2375 #if 0 /* XXX */ 2376 register char *thisitem, *next; 2377 char *good; 2378 #define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \ 2379 ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL)) 2380 2381 thisitem = netobuf; 2382 2383 while ((next = nextitem(thisitem)) <= netobuf.send) { 2384 thisitem = next; 2385 } 2386 2387 /* Now, thisitem is first before/at boundary. */ 2388 2389 good = netobuf; /* where the good bytes go */ 2390 2391 while (netoring.add > thisitem) { 2392 if (wewant(thisitem)) { 2393 int length; 2394 2395 next = thisitem; 2396 do { 2397 next = nextitem(next); 2398 } while (wewant(next) && (nfrontp > next)); 2399 length = next-thisitem; 2400 memmove(good, thisitem, length); 2401 good += length; 2402 thisitem = next; 2403 } else { 2404 thisitem = nextitem(thisitem); 2405 } 2406 } 2407 2408 #endif /* 0 */ 2409 } 2410 2411 /* 2413 * These routines add various telnet commands to the data stream. 2414 */ 2415 2416 static void 2417 doflush() 2418 { 2419 NET2ADD(IAC, DO); 2420 NETADD(TELOPT_TM); 2421 flushline = 1; 2422 flushout = 1; 2423 (void) ttyflush(1); /* Flush/drop output */ 2424 /* do printoption AFTER flush, otherwise the output gets tossed... */ 2425 printoption("SENT", DO, TELOPT_TM); 2426 } 2427 2428 void 2429 xmitAO() 2430 { 2431 NET2ADD(IAC, AO); 2432 printoption("SENT", IAC, AO); 2433 if (autoflush) { 2434 doflush(); 2435 } 2436 } 2437 2438 2439 void 2440 xmitEL() 2441 { 2442 NET2ADD(IAC, EL); 2443 printoption("SENT", IAC, EL); 2444 } 2445 2446 void 2447 xmitEC() 2448 { 2449 NET2ADD(IAC, EC); 2450 printoption("SENT", IAC, EC); 2451 } 2452 2453 2454 int 2455 dosynch(s) 2456 char *s; 2457 { 2458 netclear(); /* clear the path to the network */ 2459 NETADD(IAC); 2460 setneturg(); 2461 NETADD(DM); 2462 printoption("SENT", IAC, DM); 2463 return 1; 2464 } 2465 2466 int want_status_response = 0; 2467 2468 int 2469 get_status(s) 2470 char *s; 2471 { 2472 unsigned char tmp[16]; 2473 register unsigned char *cp; 2474 2475 if (my_want_state_is_dont(TELOPT_STATUS)) { 2476 printf("Remote side does not support STATUS option\n"); 2477 return 0; 2478 } 2479 cp = tmp; 2480 2481 *cp++ = IAC; 2482 *cp++ = SB; 2483 *cp++ = TELOPT_STATUS; 2484 *cp++ = TELQUAL_SEND; 2485 *cp++ = IAC; 2486 *cp++ = SE; 2487 if (NETROOM() >= cp - tmp) { 2488 ring_supply_data(&netoring, tmp, cp-tmp); 2489 printsub('>', tmp+2, cp - tmp - 2); 2490 } 2491 ++want_status_response; 2492 return 1; 2493 } 2494 2495 void 2496 intp() 2497 { 2498 NET2ADD(IAC, IP); 2499 printoption("SENT", IAC, IP); 2500 flushline = 1; 2501 if (autoflush) { 2502 doflush(); 2503 } 2504 if (autosynch) { 2505 dosynch(NULL); 2506 } 2507 } 2508 2509 void 2510 sendbrk() 2511 { 2512 NET2ADD(IAC, BREAK); 2513 printoption("SENT", IAC, BREAK); 2514 flushline = 1; 2515 if (autoflush) { 2516 doflush(); 2517 } 2518 if (autosynch) { 2519 dosynch(NULL); 2520 } 2521 } 2522 2523 void 2524 sendabort() 2525 { 2526 NET2ADD(IAC, ABORT); 2527 printoption("SENT", IAC, ABORT); 2528 flushline = 1; 2529 if (autoflush) { 2530 doflush(); 2531 } 2532 if (autosynch) { 2533 dosynch(NULL); 2534 } 2535 } 2536 2537 void 2538 sendsusp() 2539 { 2540 NET2ADD(IAC, SUSP); 2541 printoption("SENT", IAC, SUSP); 2542 flushline = 1; 2543 if (autoflush) { 2544 doflush(); 2545 } 2546 if (autosynch) { 2547 dosynch(NULL); 2548 } 2549 } 2550 2551 void 2552 sendeof() 2553 { 2554 NET2ADD(IAC, xEOF); 2555 printoption("SENT", IAC, xEOF); 2556 } 2557 2558 void 2559 sendayt() 2560 { 2561 NET2ADD(IAC, AYT); 2562 printoption("SENT", IAC, AYT); 2563 } 2564 2565 /* 2566 * Send a window size update to the remote system. 2567 */ 2568 2569 void 2570 sendnaws() 2571 { 2572 long rows, cols; 2573 unsigned char tmp[16]; 2574 register unsigned char *cp; 2575 2576 if (my_state_is_wont(TELOPT_NAWS)) 2577 return; 2578 2579 #define PUTSHORT(cp, x) { if ((*cp++ = ((x)>>8)&0xff) == IAC) *cp++ = IAC; \ 2580 if ((*cp++ = ((x))&0xff) == IAC) *cp++ = IAC; } 2581 2582 if (TerminalWindowSize(&rows, &cols) == 0) { /* Failed */ 2583 return; 2584 } 2585 2586 cp = tmp; 2587 2588 *cp++ = IAC; 2589 *cp++ = SB; 2590 *cp++ = TELOPT_NAWS; 2591 PUTSHORT(cp, cols); 2592 PUTSHORT(cp, rows); 2593 *cp++ = IAC; 2594 *cp++ = SE; 2595 if (NETROOM() >= cp - tmp) { 2596 ring_supply_data(&netoring, tmp, cp-tmp); 2597 printsub('>', tmp+2, cp - tmp - 2); 2598 } 2599 } 2600 2601 void 2602 tel_enter_binary(rw) 2603 int rw; 2604 { 2605 if (rw&1) 2606 send_do(TELOPT_BINARY, 1); 2607 if (rw&2) 2608 send_will(TELOPT_BINARY, 1); 2609 } 2610 2611 void 2612 tel_leave_binary(rw) 2613 int rw; 2614 { 2615 if (rw&1) 2616 send_dont(TELOPT_BINARY, 1); 2617 if (rw&2) 2618 send_wont(TELOPT_BINARY, 1); 2619 } 2620
Indexes created Mon Oct 27 04:09:48 GMT 2025