telnet.c revision 1.11
1 /* $NetBSD: telnet.c,v 1.11 1998/07/26 22:35:49 mycroft 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 1.11 1998/07/26 22:35:49 mycroft 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 clienteof = 0; 118 119 char *prompt = 0; 120 121 cc_t escape; 122 cc_t rlogin; 123 #ifdef KLUDGELINEMODE 124 cc_t echoc; 125 #endif 126 127 /* 128 * Telnet receiver states for fsm 129 */ 130 #define TS_DATA 0 131 #define TS_IAC 1 132 #define TS_WILL 2 133 #define TS_WONT 3 134 #define TS_DO 4 135 #define TS_DONT 5 136 #define TS_CR 6 137 #define TS_SB 7 /* sub-option collection */ 138 #define TS_SE 8 /* looking for sub-option end */ 139 140 static int telrcv_state; 141 #ifdef OLD_ENVIRON 142 unsigned char telopt_environ = TELOPT_NEW_ENVIRON; 143 #else 144 # define telopt_environ TELOPT_NEW_ENVIRON 145 #endif 146 147 jmp_buf toplevel = { 0 }; 148 jmp_buf peerdied; 149 150 int flushline; 151 int linemode; 152 153 #ifdef KLUDGELINEMODE 154 int kludgelinemode = 1; 155 #endif 156 157 static void dooption P((int)); 158 static void dontoption P((int)); 159 static void suboption P((void)); 160 static int telsnd P((void)); 161 static void netclear P((void)); 162 static void doflush P((void)); 163 164 /* 165 * The following are some clocks used to decide how to interpret 166 * the relationship between various variables. 167 */ 168 169 Clocks clocks; 170 171 #ifdef notdef 173 Modelist modelist[] = { 174 { "telnet command mode", COMMAND_LINE }, 175 { "character-at-a-time mode", 0 }, 176 { "character-at-a-time mode (local echo)", LOCAL_ECHO|LOCAL_CHARS }, 177 { "line-by-line mode (remote echo)", LINE | LOCAL_CHARS }, 178 { "line-by-line mode", LINE | LOCAL_ECHO | LOCAL_CHARS }, 179 { "line-by-line mode (local echoing suppressed)", LINE | LOCAL_CHARS }, 180 { "3270 mode", 0 }, 181 }; 182 #endif 183 184 185 /* 187 * Initialize telnet environment. 188 */ 189 190 void 191 init_telnet() 192 { 193 env_init(); 194 195 SB_CLEAR(); 196 ClearArray(options); 197 198 connected = In3270 = ISend = localflow = donebinarytoggle = 0; 199 #if defined(AUTHENTICATION) 200 auth_encrypt_connect(connected); 201 #endif /* defined(AUTHENTICATION) */ 202 restartany = -1; 203 204 SYNCHing = 0; 205 206 /* Don't change NetTrace */ 207 208 escape = CONTROL(']'); 209 rlogin = _POSIX_VDISABLE; 210 #ifdef KLUDGELINEMODE 211 echoc = CONTROL('E'); 212 #endif 213 214 flushline = 1; 215 telrcv_state = TS_DATA; 216 } 217 218 220 #ifdef notdef 221 #include <varargs.h> 222 223 /*VARARGS*/ 224 static void 225 printring(va_alist) 226 va_dcl 227 { 228 va_list ap; 229 char buffer[100]; /* where things go */ 230 char *ptr; 231 char *format; 232 char *string; 233 Ring *ring; 234 int i; 235 236 va_start(ap); 237 238 ring = va_arg(ap, Ring *); 239 format = va_arg(ap, char *); 240 ptr = buffer; 241 242 while ((i = *format++) != 0) { 243 if (i == '%') { 244 i = *format++; 245 switch (i) { 246 case 'c': 247 *ptr++ = va_arg(ap, int); 248 break; 249 case 's': 250 string = va_arg(ap, char *); 251 ring_supply_data(ring, buffer, ptr-buffer); 252 ring_supply_data(ring, string, strlen(string)); 253 ptr = buffer; 254 break; 255 case 0: 256 ExitString("printring: trailing %%.\n", 1); 257 /*NOTREACHED*/ 258 default: 259 ExitString("printring: unknown format character.\n", 1); 260 /*NOTREACHED*/ 261 } 262 } else { 263 *ptr++ = i; 264 } 265 } 266 ring_supply_data(ring, buffer, ptr-buffer); 267 } 268 #endif 269 270 /* 271 * These routines are in charge of sending option negotiations 272 * to the other side. 273 * 274 * The basic idea is that we send the negotiation if either side 275 * is in disagreement as to what the current state should be. 276 */ 277 278 void 279 send_do(c, init) 280 register int c, init; 281 { 282 if (init) { 283 if (((do_dont_resp[c] == 0) && my_state_is_do(c)) || 284 my_want_state_is_do(c)) 285 return; 286 set_my_want_state_do(c); 287 do_dont_resp[c]++; 288 } 289 NET2ADD(IAC, DO); 290 NETADD(c); 291 printoption("SENT", DO, c); 292 } 293 294 void 295 send_dont(c, init) 296 register int c, init; 297 { 298 if (init) { 299 if (((do_dont_resp[c] == 0) && my_state_is_dont(c)) || 300 my_want_state_is_dont(c)) 301 return; 302 set_my_want_state_dont(c); 303 do_dont_resp[c]++; 304 } 305 NET2ADD(IAC, DONT); 306 NETADD(c); 307 printoption("SENT", DONT, c); 308 } 309 310 void 311 send_will(c, init) 312 register int c, init; 313 { 314 if (init) { 315 if (((will_wont_resp[c] == 0) && my_state_is_will(c)) || 316 my_want_state_is_will(c)) 317 return; 318 set_my_want_state_will(c); 319 will_wont_resp[c]++; 320 } 321 NET2ADD(IAC, WILL); 322 NETADD(c); 323 printoption("SENT", WILL, c); 324 } 325 326 void 327 send_wont(c, init) 328 register int c, init; 329 { 330 if (init) { 331 if (((will_wont_resp[c] == 0) && my_state_is_wont(c)) || 332 my_want_state_is_wont(c)) 333 return; 334 set_my_want_state_wont(c); 335 will_wont_resp[c]++; 336 } 337 NET2ADD(IAC, WONT); 338 NETADD(c); 339 printoption("SENT", WONT, c); 340 } 341 342 343 void 344 willoption(option) 345 int option; 346 { 347 int new_state_ok = 0; 348 349 if (do_dont_resp[option]) { 350 --do_dont_resp[option]; 351 if (do_dont_resp[option] && my_state_is_do(option)) 352 --do_dont_resp[option]; 353 } 354 355 if ((do_dont_resp[option] == 0) && my_want_state_is_dont(option)) { 356 357 switch (option) { 358 359 case TELOPT_ECHO: 360 # if defined(TN3270) 361 /* 362 * The following is a pain in the rear-end. 363 * Various IBM servers (some versions of Wiscnet, 364 * possibly Fibronics/Spartacus, and who knows who 365 * else) will NOT allow us to send "DO SGA" too early 366 * in the setup proceedings. On the other hand, 367 * 4.2 servers (telnetd) won't set SGA correctly. 368 * So, we are stuck. Empirically (but, based on 369 * a VERY small sample), the IBM servers don't send 370 * out anything about ECHO, so we postpone our sending 371 * "DO SGA" until we see "WILL ECHO" (which 4.2 servers 372 * DO send). 373 */ 374 { 375 if (askedSGA == 0) { 376 askedSGA = 1; 377 if (my_want_state_is_dont(TELOPT_SGA)) 378 send_do(TELOPT_SGA, 1); 379 } 380 } 381 /* Fall through */ 382 case TELOPT_EOR: 383 #endif /* defined(TN3270) */ 384 case TELOPT_BINARY: 385 case TELOPT_SGA: 386 settimer(modenegotiated); 387 /* FALL THROUGH */ 388 case TELOPT_STATUS: 389 #if defined(AUTHENTICATION) 390 case TELOPT_AUTHENTICATION: 391 #endif 392 new_state_ok = 1; 393 break; 394 395 case TELOPT_TM: 396 if (flushout) 397 flushout = 0; 398 /* 399 * Special case for TM. If we get back a WILL, 400 * pretend we got back a WONT. 401 */ 402 set_my_want_state_dont(option); 403 set_my_state_dont(option); 404 return; /* Never reply to TM will's/wont's */ 405 406 case TELOPT_LINEMODE: 407 default: 408 break; 409 } 410 411 if (new_state_ok) { 412 set_my_want_state_do(option); 413 send_do(option, 0); 414 setconnmode(0); /* possibly set new tty mode */ 415 } else { 416 do_dont_resp[option]++; 417 send_dont(option, 0); 418 } 419 } 420 set_my_state_do(option); 421 } 422 423 void 424 wontoption(option) 425 int option; 426 { 427 if (do_dont_resp[option]) { 428 --do_dont_resp[option]; 429 if (do_dont_resp[option] && my_state_is_dont(option)) 430 --do_dont_resp[option]; 431 } 432 433 if ((do_dont_resp[option] == 0) && my_want_state_is_do(option)) { 434 435 switch (option) { 436 437 #ifdef KLUDGELINEMODE 438 case TELOPT_SGA: 439 if (!kludgelinemode) 440 break; 441 /* FALL THROUGH */ 442 #endif 443 case TELOPT_ECHO: 444 settimer(modenegotiated); 445 break; 446 447 case TELOPT_TM: 448 if (flushout) 449 flushout = 0; 450 set_my_want_state_dont(option); 451 set_my_state_dont(option); 452 return; /* Never reply to TM will's/wont's */ 453 454 default: 455 break; 456 } 457 set_my_want_state_dont(option); 458 if (my_state_is_do(option)) 459 send_dont(option, 0); 460 setconnmode(0); /* Set new tty mode */ 461 } else if (option == TELOPT_TM) { 462 /* 463 * Special case for TM. 464 */ 465 if (flushout) 466 flushout = 0; 467 set_my_want_state_dont(option); 468 } 469 set_my_state_dont(option); 470 } 471 472 static void 473 dooption(option) 474 int option; 475 { 476 int new_state_ok = 0; 477 478 if (will_wont_resp[option]) { 479 --will_wont_resp[option]; 480 if (will_wont_resp[option] && my_state_is_will(option)) 481 --will_wont_resp[option]; 482 } 483 484 if (will_wont_resp[option] == 0) { 485 if (my_want_state_is_wont(option)) { 486 487 switch (option) { 488 489 case TELOPT_TM: 490 /* 491 * Special case for TM. We send a WILL, but pretend 492 * we sent WONT. 493 */ 494 send_will(option, 0); 495 set_my_want_state_wont(TELOPT_TM); 496 set_my_state_wont(TELOPT_TM); 497 return; 498 499 # if defined(TN3270) 500 case TELOPT_EOR: /* end of record */ 501 # endif /* defined(TN3270) */ 502 case TELOPT_BINARY: /* binary mode */ 503 case TELOPT_NAWS: /* window size */ 504 case TELOPT_TSPEED: /* terminal speed */ 505 case TELOPT_LFLOW: /* local flow control */ 506 case TELOPT_TTYPE: /* terminal type option */ 507 case TELOPT_SGA: /* no big deal */ 508 new_state_ok = 1; 509 break; 510 511 case TELOPT_NEW_ENVIRON: /* New environment variable option */ 512 #ifdef OLD_ENVIRON 513 if (my_state_is_will(TELOPT_OLD_ENVIRON)) 514 send_wont(TELOPT_OLD_ENVIRON, 1); /* turn off the old */ 515 goto env_common; 516 case TELOPT_OLD_ENVIRON: /* Old environment variable option */ 517 if (my_state_is_will(TELOPT_NEW_ENVIRON)) 518 break; /* Don't enable if new one is in use! */ 519 env_common: 520 telopt_environ = option; 521 #endif 522 new_state_ok = 1; 523 break; 524 525 #if defined(AUTHENTICATION) 526 case TELOPT_AUTHENTICATION: 527 if (autologin) 528 new_state_ok = 1; 529 break; 530 #endif 531 532 case TELOPT_XDISPLOC: /* X Display location */ 533 if (env_getvalue((unsigned char *)"DISPLAY")) 534 new_state_ok = 1; 535 break; 536 537 case TELOPT_LINEMODE: 538 #ifdef KLUDGELINEMODE 539 kludgelinemode = 0; 540 send_do(TELOPT_SGA, 1); 541 #endif 542 set_my_want_state_will(TELOPT_LINEMODE); 543 send_will(option, 0); 544 set_my_state_will(TELOPT_LINEMODE); 545 slc_init(); 546 return; 547 548 case TELOPT_ECHO: /* We're never going to echo... */ 549 default: 550 break; 551 } 552 553 if (new_state_ok) { 554 set_my_want_state_will(option); 555 send_will(option, 0); 556 setconnmode(0); /* Set new tty mode */ 557 } else { 558 will_wont_resp[option]++; 559 send_wont(option, 0); 560 } 561 } else { 562 /* 563 * Handle options that need more things done after the 564 * other side has acknowledged the option. 565 */ 566 switch (option) { 567 case TELOPT_LINEMODE: 568 #ifdef KLUDGELINEMODE 569 kludgelinemode = 0; 570 send_do(TELOPT_SGA, 1); 571 #endif 572 set_my_state_will(option); 573 slc_init(); 574 send_do(TELOPT_SGA, 0); 575 return; 576 } 577 } 578 } 579 set_my_state_will(option); 580 } 581 582 static void 583 dontoption(option) 584 int option; 585 { 586 587 if (will_wont_resp[option]) { 588 --will_wont_resp[option]; 589 if (will_wont_resp[option] && my_state_is_wont(option)) 590 --will_wont_resp[option]; 591 } 592 593 if ((will_wont_resp[option] == 0) && my_want_state_is_will(option)) { 594 switch (option) { 595 case TELOPT_LINEMODE: 596 linemode = 0; /* put us back to the default state */ 597 break; 598 #ifdef OLD_ENVIRON 599 case TELOPT_NEW_ENVIRON: 600 /* 601 * The new environ option wasn't recognized, try 602 * the old one. 603 */ 604 send_will(TELOPT_OLD_ENVIRON, 1); 605 telopt_environ = TELOPT_OLD_ENVIRON; 606 break; 607 #endif 608 } 609 /* we always accept a DONT */ 610 set_my_want_state_wont(option); 611 if (my_state_is_will(option)) 612 send_wont(option, 0); 613 setconnmode(0); /* Set new tty mode */ 614 } 615 set_my_state_wont(option); 616 } 617 618 /* 619 * Given a buffer returned by tgetent(), this routine will turn 620 * the pipe seperated list of names in the buffer into an array 621 * of pointers to null terminated names. We toss out any bad, 622 * duplicate, or verbose names (names with spaces). 623 */ 624 625 static char *name_unknown = "UNKNOWN"; 626 static char *unknown[] = { 0, 0 }; 627 628 char ** 629 mklist(buf, name) 630 char *buf, *name; 631 { 632 register int n; 633 register char c, *cp, **argvp, *cp2, **argv, **avt; 634 635 if (name) { 636 if ((int)strlen(name) > 40) { 637 name = 0; 638 unknown[0] = name_unknown; 639 } else { 640 unknown[0] = name; 641 upcase(name); 642 } 643 } else 644 unknown[0] = name_unknown; 645 /* 646 * Count up the number of names. 647 */ 648 for (n = 1, cp = buf; *cp && *cp != ':'; cp++) { 649 if (*cp == '|') 650 n++; 651 } 652 /* 653 * Allocate an array to put the name pointers into 654 */ 655 argv = (char **)malloc((n+3)*sizeof(char *)); 656 if (argv == 0) 657 return(unknown); 658 659 /* 660 * Fill up the array of pointers to names. 661 */ 662 *argv = 0; 663 argvp = argv+1; 664 n = 0; 665 for (cp = cp2 = buf; (c = *cp); cp++) { 666 if (c == '|' || c == ':') { 667 *cp++ = '\0'; 668 /* 669 * Skip entries that have spaces or are over 40 670 * characters long. If this is our environment 671 * name, then put it up front. Otherwise, as 672 * long as this is not a duplicate name (case 673 * insensitive) add it to the list. 674 */ 675 if (n || (cp - cp2 > 41)) 676 ; 677 else if (name && (strncasecmp(name, cp2, cp-cp2) == 0)) 678 *argv = cp2; 679 else if (is_unique(cp2, argv+1, argvp)) 680 *argvp++ = cp2; 681 if (c == ':') 682 break; 683 /* 684 * Skip multiple delimiters. Reset cp2 to 685 * the beginning of the next name. Reset n, 686 * the flag for names with spaces. 687 */ 688 while ((c = *cp) == '|') 689 cp++; 690 cp2 = cp; 691 n = 0; 692 } 693 /* 694 * Skip entries with spaces or non-ascii values. 695 * Convert lower case letters to upper case. 696 */ 697 if ((c == ' ') || !isascii(c)) 698 n = 1; 699 else if (islower(c)) 700 *cp = toupper(c); 701 } 702 703 /* 704 * Check for an old V6 2 character name. If the second 705 * name points to the beginning of the buffer, and is 706 * only 2 characters long, move it to the end of the array. 707 */ 708 if ((argv[1] == buf) && (strlen(argv[1]) == 2)) { 709 --argvp; 710 for (avt = &argv[1]; avt < argvp; avt++) 711 *avt = *(avt+1); 712 *argvp++ = buf; 713 } 714 715 /* 716 * Duplicate last name, for TTYPE option, and null 717 * terminate the array. If we didn't find a match on 718 * our terminal name, put that name at the beginning. 719 */ 720 cp = *(argvp-1); 721 *argvp++ = cp; 722 *argvp = 0; 723 724 if (*argv == 0) { 725 if (name) 726 *argv = name; 727 else { 728 --argvp; 729 for (avt = argv; avt < argvp; avt++) 730 *avt = *(avt+1); 731 } 732 } 733 if (*argv) 734 return(argv); 735 else 736 return(unknown); 737 } 738 739 int 740 is_unique(name, as, ae) 741 register char *name, **as, **ae; 742 { 743 register char **ap; 744 register int n; 745 746 n = strlen(name) + 1; 747 for (ap = as; ap < ae; ap++) 748 if (strncasecmp(*ap, name, n) == 0) 749 return(0); 750 return (1); 751 } 752 753 #ifdef TERMCAP 754 char termbuf[1024]; 755 756 /*ARGSUSED*/ 757 int 758 setupterm(tname, fd, errp) 759 char *tname; 760 int fd, *errp; 761 { 762 if (tgetent(termbuf, tname) == 1) { 763 termbuf[1023] = '\0'; 764 if (errp) 765 *errp = 1; 766 return(0); 767 } 768 if (errp) 769 *errp = 0; 770 return(-1); 771 } 772 #else 773 #define termbuf ttytype 774 extern char ttytype[]; 775 #endif 776 777 int resettermname = 1; 778 779 char * 780 gettermname() 781 { 782 char *tname; 783 static char **tnamep = 0; 784 static char **next; 785 int err; 786 787 if (resettermname) { 788 resettermname = 0; 789 if (tnamep && tnamep != unknown) 790 free(tnamep); 791 if ((tname = (char *)env_getvalue((unsigned char *)"TERM")) && 792 (setupterm(tname, 1, &err) == 0)) { 793 tnamep = mklist(termbuf, tname); 794 } else { 795 if (tname && ((int)strlen(tname) <= 40)) { 796 unknown[0] = tname; 797 upcase(tname); 798 } else 799 unknown[0] = name_unknown; 800 tnamep = unknown; 801 } 802 next = tnamep; 803 } 804 if (*next == 0) 805 next = tnamep; 806 return(*next++); 807 } 808 /* 809 * suboption() 810 * 811 * Look at the sub-option buffer, and try to be helpful to the other 812 * side. 813 * 814 * Currently we recognize: 815 * 816 * Terminal type, send request. 817 * Terminal speed (send request). 818 * Local flow control (is request). 819 * Linemode 820 */ 821 822 static void 823 suboption() 824 { 825 unsigned char subchar; 826 827 printsub('<', subbuffer, SB_LEN()+2); 828 switch (subchar = SB_GET()) { 829 case TELOPT_TTYPE: 830 if (my_want_state_is_wont(TELOPT_TTYPE)) 831 return; 832 if (SB_EOF() || SB_GET() != TELQUAL_SEND) { 833 return; 834 } else { 835 char *name; 836 unsigned char temp[50]; 837 int len; 838 839 #if defined(TN3270) 840 if (tn3270_ttype()) { 841 return; 842 } 843 #endif /* defined(TN3270) */ 844 name = gettermname(); 845 len = strlen(name) + 4 + 2; 846 if (len < NETROOM()) { 847 sprintf((char *)temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE, 848 TELQUAL_IS, name, IAC, SE); 849 ring_supply_data(&netoring, temp, len); 850 printsub('>', &temp[2], len-2); 851 } else { 852 ExitString("No room in buffer for terminal type.\n", 1); 853 /*NOTREACHED*/ 854 } 855 } 856 break; 857 case TELOPT_TSPEED: 858 if (my_want_state_is_wont(TELOPT_TSPEED)) 859 return; 860 if (SB_EOF()) 861 return; 862 if (SB_GET() == TELQUAL_SEND) { 863 long ospeed, ispeed; 864 unsigned char temp[50]; 865 int len; 866 867 TerminalSpeeds(&ispeed, &ospeed); 868 869 sprintf((char *)temp, "%c%c%c%c%ld,%ld%c%c", IAC, SB, TELOPT_TSPEED, 870 TELQUAL_IS, (long)ospeed, (long)ispeed, IAC, SE); 871 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 872 873 if (len < NETROOM()) { 874 ring_supply_data(&netoring, temp, len); 875 printsub('>', temp+2, len - 2); 876 } 877 /*@*/ else printf("lm_will: not enough room in buffer\n"); 878 } 879 break; 880 case TELOPT_LFLOW: 881 if (my_want_state_is_wont(TELOPT_LFLOW)) 882 return; 883 if (SB_EOF()) 884 return; 885 switch(SB_GET()) { 886 case LFLOW_RESTART_ANY: 887 restartany = 1; 888 break; 889 case LFLOW_RESTART_XON: 890 restartany = 0; 891 break; 892 case LFLOW_ON: 893 localflow = 1; 894 break; 895 case LFLOW_OFF: 896 localflow = 0; 897 break; 898 default: 899 return; 900 } 901 setcommandmode(); 902 setconnmode(0); 903 break; 904 905 case TELOPT_LINEMODE: 906 if (my_want_state_is_wont(TELOPT_LINEMODE)) 907 return; 908 if (SB_EOF()) 909 return; 910 switch (SB_GET()) { 911 case WILL: 912 lm_will(subpointer, SB_LEN()); 913 break; 914 case WONT: 915 lm_wont(subpointer, SB_LEN()); 916 break; 917 case DO: 918 lm_do(subpointer, SB_LEN()); 919 break; 920 case DONT: 921 lm_dont(subpointer, SB_LEN()); 922 break; 923 case LM_SLC: 924 slc(subpointer, SB_LEN()); 925 break; 926 case LM_MODE: 927 lm_mode(subpointer, SB_LEN(), 0); 928 break; 929 default: 930 break; 931 } 932 break; 933 934 #ifdef OLD_ENVIRON 935 case TELOPT_OLD_ENVIRON: 936 #endif 937 case TELOPT_NEW_ENVIRON: 938 if (SB_EOF()) 939 return; 940 switch(SB_PEEK()) { 941 case TELQUAL_IS: 942 case TELQUAL_INFO: 943 if (my_want_state_is_dont(subchar)) 944 return; 945 break; 946 case TELQUAL_SEND: 947 if (my_want_state_is_wont(subchar)) { 948 return; 949 } 950 break; 951 default: 952 return; 953 } 954 env_opt(subpointer, SB_LEN()); 955 break; 956 957 case TELOPT_XDISPLOC: 958 if (my_want_state_is_wont(TELOPT_XDISPLOC)) 959 return; 960 if (SB_EOF()) 961 return; 962 if (SB_GET() == TELQUAL_SEND) { 963 unsigned char temp[50], *dp; 964 int len; 965 966 if ((dp = env_getvalue((unsigned char *)"DISPLAY")) == NULL) { 967 /* 968 * Something happened, we no longer have a DISPLAY 969 * variable. So, turn off the option. 970 */ 971 send_wont(TELOPT_XDISPLOC, 1); 972 break; 973 } 974 sprintf((char *)temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_XDISPLOC, 975 TELQUAL_IS, dp, IAC, SE); 976 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 977 978 if (len < NETROOM()) { 979 ring_supply_data(&netoring, temp, len); 980 printsub('>', temp+2, len - 2); 981 } 982 /*@*/ else printf("lm_will: not enough room in buffer\n"); 983 } 984 break; 985 986 #if defined(AUTHENTICATION) 987 case TELOPT_AUTHENTICATION: { 988 if (!autologin) 989 break; 990 if (SB_EOF()) 991 return; 992 switch(SB_GET()) { 993 case TELQUAL_IS: 994 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 995 return; 996 auth_is(subpointer, SB_LEN()); 997 break; 998 case TELQUAL_SEND: 999 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 1000 return; 1001 auth_send(subpointer, SB_LEN()); 1002 break; 1003 case TELQUAL_REPLY: 1004 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 1005 return; 1006 auth_reply(subpointer, SB_LEN()); 1007 break; 1008 case TELQUAL_NAME: 1009 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 1010 return; 1011 auth_name(subpointer, SB_LEN()); 1012 break; 1013 } 1014 } 1015 break; 1016 #endif 1017 default: 1018 break; 1019 } 1020 } 1021 1022 static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE }; 1023 1024 void 1025 lm_will(cmd, len) 1026 unsigned char *cmd; 1027 int len; 1028 { 1029 if (len < 1) { 1030 /*@*/ printf("lm_will: no command!!!\n"); /* Should not happen... */ 1031 return; 1032 } 1033 switch(cmd[0]) { 1034 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 1035 default: 1036 str_lm[3] = DONT; 1037 str_lm[4] = cmd[0]; 1038 if (NETROOM() > sizeof(str_lm)) { 1039 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 1040 printsub('>', &str_lm[2], sizeof(str_lm)-2); 1041 } 1042 /*@*/ else printf("lm_will: not enough room in buffer\n"); 1043 break; 1044 } 1045 } 1046 1047 void 1048 lm_wont(cmd, len) 1049 unsigned char *cmd; 1050 int len; 1051 { 1052 if (len < 1) { 1053 /*@*/ printf("lm_wont: no command!!!\n"); /* Should not happen... */ 1054 return; 1055 } 1056 switch(cmd[0]) { 1057 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 1058 default: 1059 /* We are always DONT, so don't respond */ 1060 return; 1061 } 1062 } 1063 1064 void 1065 lm_do(cmd, len) 1066 unsigned char *cmd; 1067 int len; 1068 { 1069 if (len < 1) { 1070 /*@*/ printf("lm_do: no command!!!\n"); /* Should not happen... */ 1071 return; 1072 } 1073 switch(cmd[0]) { 1074 case LM_FORWARDMASK: 1075 default: 1076 str_lm[3] = WONT; 1077 str_lm[4] = cmd[0]; 1078 if (NETROOM() > sizeof(str_lm)) { 1079 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 1080 printsub('>', &str_lm[2], sizeof(str_lm)-2); 1081 } 1082 /*@*/ else printf("lm_do: not enough room in buffer\n"); 1083 break; 1084 } 1085 } 1086 1087 void 1088 lm_dont(cmd, len) 1089 unsigned char *cmd; 1090 int len; 1091 { 1092 if (len < 1) { 1093 /*@*/ printf("lm_dont: no command!!!\n"); /* Should not happen... */ 1094 return; 1095 } 1096 switch(cmd[0]) { 1097 case LM_FORWARDMASK: 1098 default: 1099 /* we are always WONT, so don't respond */ 1100 break; 1101 } 1102 } 1103 1104 static unsigned char str_lm_mode[] = { 1105 IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE 1106 }; 1107 1108 void 1109 lm_mode(cmd, len, init) 1110 unsigned char *cmd; 1111 int len, init; 1112 { 1113 if (len != 1) 1114 return; 1115 if ((linemode&MODE_MASK&~MODE_ACK) == *cmd) 1116 return; 1117 if (*cmd&MODE_ACK) 1118 return; 1119 linemode = *cmd&(MODE_MASK&~MODE_ACK); 1120 str_lm_mode[4] = linemode; 1121 if (!init) 1122 str_lm_mode[4] |= MODE_ACK; 1123 if (NETROOM() > sizeof(str_lm_mode)) { 1124 ring_supply_data(&netoring, str_lm_mode, sizeof(str_lm_mode)); 1125 printsub('>', &str_lm_mode[2], sizeof(str_lm_mode)-2); 1126 } 1127 /*@*/ else printf("lm_mode: not enough room in buffer\n"); 1128 setconnmode(0); /* set changed mode */ 1129 } 1130 1131 1132 1134 /* 1135 * slc() 1136 * Handle special character suboption of LINEMODE. 1137 */ 1138 1139 struct spc { 1140 cc_t val; 1141 cc_t *valp; 1142 char flags; /* Current flags & level */ 1143 char mylevel; /* Maximum level & flags */ 1144 } spc_data[NSLC+1]; 1145 1146 #define SLC_IMPORT 0 1147 #define SLC_EXPORT 1 1148 #define SLC_RVALUE 2 1149 static int slc_mode = SLC_EXPORT; 1150 1151 void 1152 slc_init() 1153 { 1154 register struct spc *spcp; 1155 1156 localchars = 1; 1157 for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) { 1158 spcp->val = 0; 1159 spcp->valp = 0; 1160 spcp->flags = spcp->mylevel = SLC_NOSUPPORT; 1161 } 1162 1163 #define initfunc(func, flags) { \ 1164 spcp = &spc_data[func]; \ 1165 if ((spcp->valp = tcval(func)) != NULL){ \ 1166 spcp->val = *spcp->valp; \ 1167 spcp->mylevel = SLC_VARIABLE|flags; \ 1168 } else { \ 1169 spcp->val = 0; \ 1170 spcp->mylevel = SLC_DEFAULT; \ 1171 } \ 1172 } 1173 1174 initfunc(SLC_SYNCH, 0); 1175 /* No BRK */ 1176 initfunc(SLC_AO, 0); 1177 initfunc(SLC_AYT, 0); 1178 /* No EOR */ 1179 initfunc(SLC_ABORT, SLC_FLUSHIN|SLC_FLUSHOUT); 1180 initfunc(SLC_EOF, 0); 1181 #ifndef SYSV_TERMIO 1182 initfunc(SLC_SUSP, SLC_FLUSHIN); 1183 #endif 1184 initfunc(SLC_EC, 0); 1185 initfunc(SLC_EL, 0); 1186 #ifndef SYSV_TERMIO 1187 initfunc(SLC_EW, 0); 1188 initfunc(SLC_RP, 0); 1189 initfunc(SLC_LNEXT, 0); 1190 #endif 1191 initfunc(SLC_XON, 0); 1192 initfunc(SLC_XOFF, 0); 1193 #ifdef SYSV_TERMIO 1194 spc_data[SLC_XON].mylevel = SLC_CANTCHANGE; 1195 spc_data[SLC_XOFF].mylevel = SLC_CANTCHANGE; 1196 #endif 1197 initfunc(SLC_FORW1, 0); 1198 #ifdef USE_TERMIO 1199 initfunc(SLC_FORW2, 0); 1200 /* No FORW2 */ 1201 #endif 1202 1203 initfunc(SLC_IP, SLC_FLUSHIN|SLC_FLUSHOUT); 1204 #undef initfunc 1205 1206 if (slc_mode == SLC_EXPORT) 1207 slc_export(); 1208 else 1209 slc_import(1); 1210 1211 } 1212 1213 void 1214 slcstate() 1215 { 1216 printf("Special characters are %s values\n", 1217 slc_mode == SLC_IMPORT ? "remote default" : 1218 slc_mode == SLC_EXPORT ? "local" : 1219 "remote"); 1220 } 1221 1222 void 1223 slc_mode_export(n) 1224 int n; 1225 { 1226 slc_mode = SLC_EXPORT; 1227 if (my_state_is_will(TELOPT_LINEMODE)) 1228 slc_export(); 1229 } 1230 1231 void 1232 slc_mode_import(def) 1233 int def; 1234 { 1235 slc_mode = def ? SLC_IMPORT : SLC_RVALUE; 1236 if (my_state_is_will(TELOPT_LINEMODE)) 1237 slc_import(def); 1238 } 1239 1240 unsigned char slc_import_val[] = { 1241 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE 1242 }; 1243 unsigned char slc_import_def[] = { 1244 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE 1245 }; 1246 1247 void 1248 slc_import(def) 1249 int def; 1250 { 1251 if (NETROOM() > sizeof(slc_import_val)) { 1252 if (def) { 1253 ring_supply_data(&netoring, slc_import_def, sizeof(slc_import_def)); 1254 printsub('>', &slc_import_def[2], sizeof(slc_import_def)-2); 1255 } else { 1256 ring_supply_data(&netoring, slc_import_val, sizeof(slc_import_val)); 1257 printsub('>', &slc_import_val[2], sizeof(slc_import_val)-2); 1258 } 1259 } 1260 /*@*/ else printf("slc_import: not enough room\n"); 1261 } 1262 1263 void 1264 slc_export() 1265 { 1266 register struct spc *spcp; 1267 1268 TerminalDefaultChars(); 1269 1270 slc_start_reply(); 1271 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1272 if (spcp->mylevel != SLC_NOSUPPORT) { 1273 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1274 spcp->flags = SLC_NOSUPPORT; 1275 else 1276 spcp->flags = spcp->mylevel; 1277 if (spcp->valp) 1278 spcp->val = *spcp->valp; 1279 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1280 } 1281 } 1282 slc_end_reply(); 1283 (void)slc_update(); 1284 setconnmode(1); /* Make sure the character values are set */ 1285 } 1286 1287 void 1288 slc(cp, len) 1289 register unsigned char *cp; 1290 int len; 1291 { 1292 register struct spc *spcp; 1293 register int func,level; 1294 1295 slc_start_reply(); 1296 1297 for (; len >= 3; len -=3, cp +=3) { 1298 1299 func = cp[SLC_FUNC]; 1300 1301 if (func == 0) { 1302 /* 1303 * Client side: always ignore 0 function. 1304 */ 1305 continue; 1306 } 1307 if (func > NSLC) { 1308 if ((cp[SLC_FLAGS] & SLC_LEVELBITS) != SLC_NOSUPPORT) 1309 slc_add_reply(func, SLC_NOSUPPORT, 0); 1310 continue; 1311 } 1312 1313 spcp = &spc_data[func]; 1314 1315 level = cp[SLC_FLAGS]&(SLC_LEVELBITS|SLC_ACK); 1316 1317 if ((cp[SLC_VALUE] == (unsigned char)spcp->val) && 1318 ((level&SLC_LEVELBITS) == (spcp->flags&SLC_LEVELBITS))) { 1319 continue; 1320 } 1321 1322 if (level == (SLC_DEFAULT|SLC_ACK)) { 1323 /* 1324 * This is an error condition, the SLC_ACK 1325 * bit should never be set for the SLC_DEFAULT 1326 * level. Our best guess to recover is to 1327 * ignore the SLC_ACK bit. 1328 */ 1329 cp[SLC_FLAGS] &= ~SLC_ACK; 1330 } 1331 1332 if (level == ((spcp->flags&SLC_LEVELBITS)|SLC_ACK)) { 1333 spcp->val = (cc_t)cp[SLC_VALUE]; 1334 spcp->flags = cp[SLC_FLAGS]; /* include SLC_ACK */ 1335 continue; 1336 } 1337 1338 level &= ~SLC_ACK; 1339 1340 if (level <= (spcp->mylevel&SLC_LEVELBITS)) { 1341 spcp->flags = cp[SLC_FLAGS]|SLC_ACK; 1342 spcp->val = (cc_t)cp[SLC_VALUE]; 1343 } 1344 if (level == SLC_DEFAULT) { 1345 if ((spcp->mylevel&SLC_LEVELBITS) != SLC_DEFAULT) 1346 spcp->flags = spcp->mylevel; 1347 else 1348 spcp->flags = SLC_NOSUPPORT; 1349 } 1350 slc_add_reply(func, spcp->flags, spcp->val); 1351 } 1352 slc_end_reply(); 1353 if (slc_update()) 1354 setconnmode(1); /* set the new character values */ 1355 } 1356 1357 void 1358 slc_check() 1359 { 1360 register struct spc *spcp; 1361 1362 slc_start_reply(); 1363 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1364 if (spcp->valp && spcp->val != *spcp->valp) { 1365 spcp->val = *spcp->valp; 1366 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1367 spcp->flags = SLC_NOSUPPORT; 1368 else 1369 spcp->flags = spcp->mylevel; 1370 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1371 } 1372 } 1373 slc_end_reply(); 1374 setconnmode(1); 1375 } 1376 1377 1378 unsigned char slc_reply[128]; 1379 unsigned char *slc_replyp; 1380 1381 void 1382 slc_start_reply() 1383 { 1384 slc_replyp = slc_reply; 1385 *slc_replyp++ = IAC; 1386 *slc_replyp++ = SB; 1387 *slc_replyp++ = TELOPT_LINEMODE; 1388 *slc_replyp++ = LM_SLC; 1389 } 1390 1391 void 1392 slc_add_reply(func, flags, value) 1393 unsigned int func; 1394 unsigned int flags; 1395 cc_t value; 1396 { 1397 if ((*slc_replyp++ = func) == IAC) 1398 *slc_replyp++ = IAC; 1399 if ((*slc_replyp++ = flags) == IAC) 1400 *slc_replyp++ = IAC; 1401 if ((*slc_replyp++ = (unsigned char)value) == IAC) 1402 *slc_replyp++ = IAC; 1403 } 1404 1405 void 1406 slc_end_reply() 1407 { 1408 register int len; 1409 1410 *slc_replyp++ = IAC; 1411 *slc_replyp++ = SE; 1412 len = slc_replyp - slc_reply; 1413 if (len <= 6) 1414 return; 1415 if (NETROOM() > len) { 1416 ring_supply_data(&netoring, slc_reply, slc_replyp - slc_reply); 1417 printsub('>', &slc_reply[2], slc_replyp - slc_reply - 2); 1418 } 1419 /*@*/else printf("slc_end_reply: not enough room\n"); 1420 } 1421 1422 int 1423 slc_update() 1424 { 1425 register struct spc *spcp; 1426 int need_update = 0; 1427 1428 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1429 if (!(spcp->flags&SLC_ACK)) 1430 continue; 1431 spcp->flags &= ~SLC_ACK; 1432 if (spcp->valp && (*spcp->valp != spcp->val)) { 1433 *spcp->valp = spcp->val; 1434 need_update = 1; 1435 } 1436 } 1437 return(need_update); 1438 } 1439 1440 #ifdef OLD_ENVIRON 1441 # ifdef ENV_HACK 1442 /* 1443 * Earlier version of telnet/telnetd from the BSD code had 1444 * the definitions of VALUE and VAR reversed. To ensure 1445 * maximum interoperability, we assume that the server is 1446 * an older BSD server, until proven otherwise. The newer 1447 * BSD servers should be able to handle either definition, 1448 * so it is better to use the wrong values if we don't 1449 * know what type of server it is. 1450 */ 1451 int env_auto = 1; 1452 int old_env_var = OLD_ENV_VAR; 1453 int old_env_value = OLD_ENV_VALUE; 1454 # else 1455 # define old_env_var OLD_ENV_VAR 1456 # define old_env_value OLD_ENV_VALUE 1457 # endif 1458 #endif 1459 1460 void 1461 env_opt(buf, len) 1462 register unsigned char *buf; 1463 register int len; 1464 { 1465 register unsigned char *ep = 0, *epc = 0; 1466 register int i; 1467 1468 switch(buf[0]&0xff) { 1469 case TELQUAL_SEND: 1470 env_opt_start(); 1471 if (len == 1) { 1472 env_opt_add(NULL); 1473 } else for (i = 1; i < len; i++) { 1474 switch (buf[i]&0xff) { 1475 #ifdef OLD_ENVIRON 1476 case OLD_ENV_VAR: 1477 # ifdef ENV_HACK 1478 if (telopt_environ == TELOPT_OLD_ENVIRON 1479 && env_auto) { 1480 /* Server has the same definitions */ 1481 old_env_var = OLD_ENV_VAR; 1482 old_env_value = OLD_ENV_VALUE; 1483 } 1484 /* FALL THROUGH */ 1485 # endif 1486 case OLD_ENV_VALUE: 1487 /* 1488 * Although OLD_ENV_VALUE is not legal, we will 1489 * still recognize it, just in case it is an 1490 * old server that has VAR & VALUE mixed up... 1491 */ 1492 /* FALL THROUGH */ 1493 #else 1494 case NEW_ENV_VAR: 1495 #endif 1496 case ENV_USERVAR: 1497 if (ep) { 1498 *epc = 0; 1499 env_opt_add(ep); 1500 } 1501 ep = epc = &buf[i+1]; 1502 break; 1503 case ENV_ESC: 1504 i++; 1505 /*FALL THROUGH*/ 1506 default: 1507 if (epc) 1508 *epc++ = buf[i]; 1509 break; 1510 } 1511 } 1512 if (ep) { 1513 *epc = 0; 1514 env_opt_add(ep); 1515 } 1516 env_opt_end(1); 1517 break; 1518 1519 case TELQUAL_IS: 1520 case TELQUAL_INFO: 1521 /* Ignore for now. We shouldn't get it anyway. */ 1522 break; 1523 1524 default: 1525 break; 1526 } 1527 } 1528 1529 #define OPT_REPLY_SIZE 256 1530 unsigned char *opt_reply; 1531 unsigned char *opt_replyp; 1532 unsigned char *opt_replyend; 1533 1534 void 1535 env_opt_start() 1536 { 1537 if (opt_reply) 1538 opt_reply = (unsigned char *)realloc(opt_reply, OPT_REPLY_SIZE); 1539 else 1540 opt_reply = (unsigned char *)malloc(OPT_REPLY_SIZE); 1541 if (opt_reply == NULL) { 1542 /*@*/ printf("env_opt_start: malloc()/realloc() failed!!!\n"); 1543 opt_reply = opt_replyp = opt_replyend = NULL; 1544 return; 1545 } 1546 opt_replyp = opt_reply; 1547 opt_replyend = opt_reply + OPT_REPLY_SIZE; 1548 *opt_replyp++ = IAC; 1549 *opt_replyp++ = SB; 1550 *opt_replyp++ = telopt_environ; 1551 *opt_replyp++ = TELQUAL_IS; 1552 } 1553 1554 void 1555 env_opt_start_info() 1556 { 1557 env_opt_start(); 1558 if (opt_replyp) 1559 opt_replyp[-1] = TELQUAL_INFO; 1560 } 1561 1562 void 1563 env_opt_add(ep) 1564 register unsigned char *ep; 1565 { 1566 register unsigned char *vp, c; 1567 1568 if (opt_reply == NULL) /*XXX*/ 1569 return; /*XXX*/ 1570 1571 if (ep == NULL || *ep == '\0') { 1572 /* Send user defined variables first. */ 1573 env_default(1, 0); 1574 while ((ep = env_default(0, 0)) != NULL) 1575 env_opt_add(ep); 1576 1577 /* Now add the list of well know variables. */ 1578 env_default(1, 1); 1579 while ((ep = env_default(0, 1)) != NULL) 1580 env_opt_add(ep); 1581 return; 1582 } 1583 vp = env_getvalue(ep); 1584 if (opt_replyp + (vp ? strlen((char *)vp) : 0) + 1585 strlen((char *)ep) + 6 > opt_replyend) 1586 { 1587 register int len; 1588 opt_replyend += OPT_REPLY_SIZE; 1589 len = opt_replyend - opt_reply; 1590 opt_reply = (unsigned char *)realloc(opt_reply, len); 1591 if (opt_reply == NULL) { 1592 /*@*/ printf("env_opt_add: realloc() failed!!!\n"); 1593 opt_reply = opt_replyp = opt_replyend = NULL; 1594 return; 1595 } 1596 opt_replyp = opt_reply + len - (opt_replyend - opt_replyp); 1597 opt_replyend = opt_reply + len; 1598 } 1599 if (opt_welldefined(ep)) 1600 #ifdef OLD_ENVIRON 1601 if (telopt_environ == TELOPT_OLD_ENVIRON) 1602 *opt_replyp++ = old_env_var; 1603 else 1604 #endif 1605 *opt_replyp++ = NEW_ENV_VAR; 1606 else 1607 *opt_replyp++ = ENV_USERVAR; 1608 for (;;) { 1609 while ((c = *ep++) != '\0') { 1610 switch(c&0xff) { 1611 case IAC: 1612 *opt_replyp++ = IAC; 1613 break; 1614 case NEW_ENV_VAR: 1615 case NEW_ENV_VALUE: 1616 case ENV_ESC: 1617 case ENV_USERVAR: 1618 *opt_replyp++ = ENV_ESC; 1619 break; 1620 } 1621 *opt_replyp++ = c; 1622 } 1623 if ((ep = vp) != NULL) { 1624 #ifdef OLD_ENVIRON 1625 if (telopt_environ == TELOPT_OLD_ENVIRON) 1626 *opt_replyp++ = old_env_value; 1627 else 1628 #endif 1629 *opt_replyp++ = NEW_ENV_VALUE; 1630 vp = NULL; 1631 } else 1632 break; 1633 } 1634 } 1635 1636 int 1637 opt_welldefined(ep) 1638 char *ep; 1639 { 1640 if ((strcmp(ep, "USER") == 0) || 1641 (strcmp(ep, "DISPLAY") == 0) || 1642 (strcmp(ep, "PRINTER") == 0) || 1643 (strcmp(ep, "SYSTEMTYPE") == 0) || 1644 (strcmp(ep, "JOB") == 0) || 1645 (strcmp(ep, "ACCT") == 0)) 1646 return(1); 1647 return(0); 1648 } 1649 void 1650 env_opt_end(emptyok) 1651 register int emptyok; 1652 { 1653 register int len; 1654 1655 len = opt_replyp - opt_reply + 2; 1656 if (emptyok || len > 6) { 1657 *opt_replyp++ = IAC; 1658 *opt_replyp++ = SE; 1659 if (NETROOM() > len) { 1660 ring_supply_data(&netoring, opt_reply, len); 1661 printsub('>', &opt_reply[2], len - 2); 1662 } 1663 /*@*/ else printf("slc_end_reply: not enough room\n"); 1664 } 1665 if (opt_reply) { 1666 free(opt_reply); 1667 opt_reply = opt_replyp = opt_replyend = NULL; 1668 } 1669 } 1670 1671 1672 1674 int 1675 telrcv() 1676 { 1677 register int c; 1678 register int scc; 1679 register unsigned char *sbp = NULL; 1680 int count; 1681 int returnValue = 0; 1682 1683 scc = 0; 1684 count = 0; 1685 while (TTYROOM() > 2) { 1686 if (scc == 0) { 1687 if (count) { 1688 ring_consumed(&netiring, count); 1689 returnValue = 1; 1690 count = 0; 1691 } 1692 sbp = netiring.consume; 1693 scc = ring_full_consecutive(&netiring); 1694 if (scc == 0) { 1695 /* No more data coming in */ 1696 break; 1697 } 1698 } 1699 1700 c = *sbp++ & 0xff, scc--; count++; 1701 1702 switch (telrcv_state) { 1703 1704 case TS_CR: 1705 telrcv_state = TS_DATA; 1706 if (c == '\0') { 1707 break; /* Ignore \0 after CR */ 1708 } 1709 else if ((c == '\n') && my_want_state_is_dont(TELOPT_ECHO) && !crmod) { 1710 TTYADD(c); 1711 break; 1712 } 1713 /* Else, fall through */ 1714 1715 case TS_DATA: 1716 if (c == IAC) { 1717 telrcv_state = TS_IAC; 1718 break; 1719 } 1720 # if defined(TN3270) 1721 if (In3270) { 1722 *Ifrontp++ = c; 1723 while (scc > 0) { 1724 c = *sbp++ & 0377, scc--; count++; 1725 if (c == IAC) { 1726 telrcv_state = TS_IAC; 1727 break; 1728 } 1729 *Ifrontp++ = c; 1730 } 1731 } else 1732 # endif /* defined(TN3270) */ 1733 /* 1734 * The 'crmod' hack (see following) is needed 1735 * since we can't * set CRMOD on output only. 1736 * Machines like MULTICS like to send \r without 1737 * \n; since we must turn off CRMOD to get proper 1738 * input, the mapping is done here (sigh). 1739 */ 1740 if ((c == '\r') && my_want_state_is_dont(TELOPT_BINARY)) { 1741 if (scc > 0) { 1742 c = *sbp&0xff; 1743 if (c == 0) { 1744 sbp++, scc--; count++; 1745 /* a "true" CR */ 1746 TTYADD('\r'); 1747 } else if (my_want_state_is_dont(TELOPT_ECHO) && 1748 (c == '\n')) { 1749 sbp++, scc--; count++; 1750 TTYADD('\n'); 1751 } else { 1752 1753 TTYADD('\r'); 1754 if (crmod) { 1755 TTYADD('\n'); 1756 } 1757 } 1758 } else { 1759 telrcv_state = TS_CR; 1760 TTYADD('\r'); 1761 if (crmod) { 1762 TTYADD('\n'); 1763 } 1764 } 1765 } else { 1766 TTYADD(c); 1767 } 1768 continue; 1769 1770 case TS_IAC: 1771 process_iac: 1772 switch (c) { 1773 1774 case WILL: 1775 telrcv_state = TS_WILL; 1776 continue; 1777 1778 case WONT: 1779 telrcv_state = TS_WONT; 1780 continue; 1781 1782 case DO: 1783 telrcv_state = TS_DO; 1784 continue; 1785 1786 case DONT: 1787 telrcv_state = TS_DONT; 1788 continue; 1789 1790 case DM: 1791 /* 1792 * We may have missed an urgent notification, 1793 * so make sure we flush whatever is in the 1794 * buffer currently. 1795 */ 1796 printoption("RCVD", IAC, DM); 1797 SYNCHing = 1; 1798 (void) ttyflush(1); 1799 SYNCHing = stilloob(); 1800 settimer(gotDM); 1801 break; 1802 1803 case SB: 1804 SB_CLEAR(); 1805 telrcv_state = TS_SB; 1806 continue; 1807 1808 # if defined(TN3270) 1809 case EOR: 1810 if (In3270) { 1811 if (Ibackp == Ifrontp) { 1812 Ibackp = Ifrontp = Ibuf; 1813 ISend = 0; /* should have been! */ 1814 } else { 1815 Ibackp += DataFromNetwork(Ibackp, Ifrontp-Ibackp, 1); 1816 ISend = 1; 1817 } 1818 } 1819 printoption("RCVD", IAC, EOR); 1820 break; 1821 # endif /* defined(TN3270) */ 1822 1823 case IAC: 1824 # if !defined(TN3270) 1825 TTYADD(IAC); 1826 # else /* !defined(TN3270) */ 1827 if (In3270) { 1828 *Ifrontp++ = IAC; 1829 } else { 1830 TTYADD(IAC); 1831 } 1832 # endif /* !defined(TN3270) */ 1833 break; 1834 1835 case NOP: 1836 case GA: 1837 default: 1838 printoption("RCVD", IAC, c); 1839 break; 1840 } 1841 telrcv_state = TS_DATA; 1842 continue; 1843 1844 case TS_WILL: 1845 printoption("RCVD", WILL, c); 1846 willoption(c); 1847 SetIn3270(); 1848 telrcv_state = TS_DATA; 1849 continue; 1850 1851 case TS_WONT: 1852 printoption("RCVD", WONT, c); 1853 wontoption(c); 1854 SetIn3270(); 1855 telrcv_state = TS_DATA; 1856 continue; 1857 1858 case TS_DO: 1859 printoption("RCVD", DO, c); 1860 dooption(c); 1861 SetIn3270(); 1862 if (c == TELOPT_NAWS) { 1863 sendnaws(); 1864 } else if (c == TELOPT_LFLOW) { 1865 localflow = 1; 1866 setcommandmode(); 1867 setconnmode(0); 1868 } 1869 telrcv_state = TS_DATA; 1870 continue; 1871 1872 case TS_DONT: 1873 printoption("RCVD", DONT, c); 1874 dontoption(c); 1875 flushline = 1; 1876 setconnmode(0); /* set new tty mode (maybe) */ 1877 SetIn3270(); 1878 telrcv_state = TS_DATA; 1879 continue; 1880 1881 case TS_SB: 1882 if (c == IAC) { 1883 telrcv_state = TS_SE; 1884 } else { 1885 SB_ACCUM(c); 1886 } 1887 continue; 1888 1889 case TS_SE: 1890 if (c != SE) { 1891 if (c != IAC) { 1892 /* 1893 * This is an error. We only expect to get 1894 * "IAC IAC" or "IAC SE". Several things may 1895 * have happend. An IAC was not doubled, the 1896 * IAC SE was left off, or another option got 1897 * inserted into the suboption are all possibilities. 1898 * If we assume that the IAC was not doubled, 1899 * and really the IAC SE was left off, we could 1900 * get into an infinate loop here. So, instead, 1901 * we terminate the suboption, and process the 1902 * partial suboption if we can. 1903 */ 1904 SB_ACCUM(IAC); 1905 SB_ACCUM(c); 1906 subpointer -= 2; 1907 SB_TERM(); 1908 1909 printoption("In SUBOPTION processing, RCVD", IAC, c); 1910 suboption(); /* handle sub-option */ 1911 SetIn3270(); 1912 telrcv_state = TS_IAC; 1913 goto process_iac; 1914 } 1915 SB_ACCUM(c); 1916 telrcv_state = TS_SB; 1917 } else { 1918 SB_ACCUM(IAC); 1919 SB_ACCUM(SE); 1920 subpointer -= 2; 1921 SB_TERM(); 1922 suboption(); /* handle sub-option */ 1923 SetIn3270(); 1924 telrcv_state = TS_DATA; 1925 } 1926 } 1927 } 1928 if (count) 1929 ring_consumed(&netiring, count); 1930 return returnValue||count; 1931 } 1932 1933 static int bol = 1, local = 0; 1934 1935 int 1936 rlogin_susp() 1937 { 1938 if (local) { 1939 local = 0; 1940 bol = 1; 1941 command(0, "z\n", 2); 1942 return(1); 1943 } 1944 return(0); 1945 } 1946 1947 static int 1948 telsnd() 1949 { 1950 int tcc; 1951 int count; 1952 int returnValue = 0; 1953 unsigned char *tbp = NULL; 1954 1955 tcc = 0; 1956 count = 0; 1957 while (NETROOM() > 2) { 1958 register int sc; 1959 register int c; 1960 1961 if (tcc == 0) { 1962 if (count) { 1963 ring_consumed(&ttyiring, count); 1964 returnValue = 1; 1965 count = 0; 1966 } 1967 tbp = ttyiring.consume; 1968 tcc = ring_full_consecutive(&ttyiring); 1969 if (tcc == 0) { 1970 break; 1971 } 1972 } 1973 c = *tbp++ & 0xff, sc = strip(c), tcc--; count++; 1974 if (rlogin != _POSIX_VDISABLE) { 1975 if (bol) { 1976 bol = 0; 1977 if (sc == rlogin) { 1978 local = 1; 1979 continue; 1980 } 1981 } else if (local) { 1982 local = 0; 1983 if (sc == '.' || c == termEofChar) { 1984 bol = 1; 1985 command(0, "close\n", 6); 1986 continue; 1987 } 1988 if (sc == termSuspChar) { 1989 bol = 1; 1990 command(0, "z\n", 2); 1991 continue; 1992 } 1993 if (sc == escape) { 1994 command(0, (char *)tbp, tcc); 1995 bol = 1; 1996 count += tcc; 1997 tcc = 0; 1998 flushline = 1; 1999 break; 2000 } 2001 if (sc != rlogin) { 2002 ++tcc; 2003 --tbp; 2004 --count; 2005 c = sc = rlogin; 2006 } 2007 } 2008 if ((sc == '\n') || (sc == '\r')) 2009 bol = 1; 2010 } else if (sc == escape) { 2011 /* 2012 * Double escape is a pass through of a single escape character. 2013 */ 2014 if (tcc && strip(*tbp) == escape) { 2015 tbp++; 2016 tcc--; 2017 count++; 2018 bol = 0; 2019 } else { 2020 command(0, (char *)tbp, tcc); 2021 bol = 1; 2022 count += tcc; 2023 tcc = 0; 2024 flushline = 1; 2025 break; 2026 } 2027 } else 2028 bol = 0; 2029 #ifdef KLUDGELINEMODE 2030 if (kludgelinemode && (globalmode&MODE_EDIT) && (sc == echoc)) { 2031 if (tcc > 0 && strip(*tbp) == echoc) { 2032 tcc--; tbp++; count++; 2033 } else { 2034 dontlecho = !dontlecho; 2035 settimer(echotoggle); 2036 setconnmode(0); 2037 flushline = 1; 2038 break; 2039 } 2040 } 2041 #endif 2042 if (sc != _POSIX_VDISABLE && MODE_LOCAL_CHARS(globalmode)) { 2043 if (TerminalSpecialChars(sc) == 0) { 2044 bol = 1; 2045 break; 2046 } 2047 } 2048 if (my_want_state_is_wont(TELOPT_BINARY)) { 2049 switch (c) { 2050 case '\n': 2051 /* 2052 * If we are in CRMOD mode (\r ==> \n) 2053 * on our local machine, then probably 2054 * a newline (unix) is CRLF (TELNET). 2055 */ 2056 if (MODE_LOCAL_CHARS(globalmode)) { 2057 NETADD('\r'); 2058 } 2059 NETADD('\n'); 2060 bol = flushline = 1; 2061 break; 2062 case '\r': 2063 if (!crlf) { 2064 NET2ADD('\r', '\0'); 2065 } else { 2066 NET2ADD('\r', '\n'); 2067 } 2068 bol = flushline = 1; 2069 break; 2070 case IAC: 2071 NET2ADD(IAC, IAC); 2072 break; 2073 default: 2074 NETADD(c); 2075 break; 2076 } 2077 } else if (c == IAC) { 2078 NET2ADD(IAC, IAC); 2079 } else { 2080 NETADD(c); 2081 } 2082 } 2083 if (count) 2084 ring_consumed(&ttyiring, count); 2085 return returnValue||count; /* Non-zero if we did anything */ 2086 } 2087 2088 /* 2090 * Scheduler() 2091 * 2092 * Try to do something. 2093 * 2094 * If we do something useful, return 1; else return 0. 2095 * 2096 */ 2097 2098 2099 int 2100 Scheduler(block) 2101 int block; /* should we block in the select ? */ 2102 { 2103 /* One wants to be a bit careful about setting returnValue 2104 * to one, since a one implies we did some useful work, 2105 * and therefore probably won't be called to block next 2106 * time (TN3270 mode only). 2107 */ 2108 int returnValue; 2109 int netin, netout, netex, ttyin, ttyout; 2110 2111 /* Decide which rings should be processed */ 2112 2113 netout = ring_full_count(&netoring) && 2114 (flushline || 2115 (my_want_state_is_wont(TELOPT_LINEMODE) 2116 #ifdef KLUDGELINEMODE 2117 && (!kludgelinemode || my_want_state_is_do(TELOPT_SGA)) 2118 #endif 2119 ) || 2120 my_want_state_is_will(TELOPT_BINARY)); 2121 ttyout = ring_full_count(&ttyoring); 2122 2123 #if defined(TN3270) 2124 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0) && (shell_active == 0); 2125 #else /* defined(TN3270) */ 2126 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0); 2127 #endif /* defined(TN3270) */ 2128 2129 #if defined(TN3270) 2130 netin = ring_empty_count(&netiring); 2131 # else /* !defined(TN3270) */ 2132 netin = !ISend && ring_empty_count(&netiring); 2133 # endif /* !defined(TN3270) */ 2134 2135 netex = !SYNCHing; 2136 2137 /* If we have seen a signal recently, reset things */ 2138 # if defined(TN3270) && defined(unix) 2139 if (HaveInput) { 2140 HaveInput = 0; 2141 (void) signal(SIGIO, inputAvailable); 2142 } 2143 #endif /* defined(TN3270) && defined(unix) */ 2144 2145 /* Call to system code to process rings */ 2146 2147 returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block); 2148 2149 /* Now, look at the input rings, looking for work to do. */ 2150 2151 if (ring_full_count(&ttyiring)) { 2152 # if defined(TN3270) 2153 if (In3270) { 2154 int c; 2155 2156 c = DataFromTerminal(ttyiring.consume, 2157 ring_full_consecutive(&ttyiring)); 2158 if (c) { 2159 returnValue = 1; 2160 ring_consumed(&ttyiring, c); 2161 } 2162 } else { 2163 # endif /* defined(TN3270) */ 2164 returnValue |= telsnd(); 2165 # if defined(TN3270) 2166 } 2167 # endif /* defined(TN3270) */ 2168 } 2169 2170 if (ring_full_count(&netiring)) { 2171 # if !defined(TN3270) 2172 returnValue |= telrcv(); 2173 # else /* !defined(TN3270) */ 2174 returnValue = Push3270(); 2175 # endif /* !defined(TN3270) */ 2176 } 2177 return returnValue; 2178 } 2179 2180 /* 2182 * Select from tty and network... 2183 */ 2184 void 2185 telnet(user) 2186 const char *user; 2187 { 2188 sys_telnet_init(); 2189 2190 #if defined(AUTHENTICATION) 2191 { 2192 static char local_host[MAXHOSTNAMELEN + 1] = { 0 }; 2193 2194 if (!local_host[0]) { 2195 gethostname(local_host, sizeof(local_host)); 2196 local_host[sizeof(local_host)-1] = 0; 2197 } 2198 auth_encrypt_init(local_host, hostname, "TELNET", 0); 2199 auth_encrypt_user(user); 2200 } 2201 #endif /* defined(AUTHENTICATION) */ 2202 # if !defined(TN3270) 2203 if (telnetport) { 2204 #if defined(AUTHENTICATION) 2205 if (autologin) 2206 send_will(TELOPT_AUTHENTICATION, 1); 2207 #endif 2208 send_do(TELOPT_SGA, 1); 2209 send_will(TELOPT_TTYPE, 1); 2210 send_will(TELOPT_NAWS, 1); 2211 send_will(TELOPT_TSPEED, 1); 2212 send_will(TELOPT_LFLOW, 1); 2213 send_will(TELOPT_LINEMODE, 1); 2214 send_will(TELOPT_NEW_ENVIRON, 1); 2215 send_do(TELOPT_STATUS, 1); 2216 if (env_getvalue((unsigned char *)"DISPLAY")) 2217 send_will(TELOPT_XDISPLOC, 1); 2218 if (eight) 2219 tel_enter_binary(eight); 2220 } 2221 # endif /* !defined(TN3270) */ 2222 2223 # if !defined(TN3270) 2224 for (;;) { 2225 int schedValue; 2226 2227 while ((schedValue = Scheduler(0)) != 0) { 2228 if (schedValue == -1) { 2229 setcommandmode(); 2230 return; 2231 } 2232 } 2233 2234 if (Scheduler(1) == -1) { 2235 setcommandmode(); 2236 return; 2237 } 2238 } 2239 # else /* !defined(TN3270) */ 2240 for (;;) { 2241 int schedValue; 2242 2243 while (!In3270 && !shell_active) { 2244 if (Scheduler(1) == -1) { 2245 setcommandmode(); 2246 return; 2247 } 2248 } 2249 2250 while ((schedValue = Scheduler(0)) != 0) { 2251 if (schedValue == -1) { 2252 setcommandmode(); 2253 return; 2254 } 2255 } 2256 /* If there is data waiting to go out to terminal, don't 2257 * schedule any more data for the terminal. 2258 */ 2259 if (ring_full_count(&ttyoring)) { 2260 schedValue = 1; 2261 } else { 2262 if (shell_active) { 2263 if (shell_continue() == 0) { 2264 ConnectScreen(); 2265 } 2266 } else if (In3270) { 2267 schedValue = DoTerminalOutput(); 2268 } 2269 } 2270 if (schedValue && (shell_active == 0)) { 2271 if (Scheduler(1) == -1) { 2272 setcommandmode(); 2273 return; 2274 } 2275 } 2276 } 2277 # endif /* !defined(TN3270) */ 2278 } 2279 2280 #if 0 /* XXX - this not being in is a bug */ 2282 /* 2283 * nextitem() 2284 * 2285 * Return the address of the next "item" in the TELNET data 2286 * stream. This will be the address of the next character if 2287 * the current address is a user data character, or it will 2288 * be the address of the character following the TELNET command 2289 * if the current address is a TELNET IAC ("I Am a Command") 2290 * character. 2291 */ 2292 2293 static char * 2294 nextitem(current) 2295 char *current; 2296 { 2297 if ((*current&0xff) != IAC) { 2298 return current+1; 2299 } 2300 switch (*(current+1)&0xff) { 2301 case DO: 2302 case DONT: 2303 case WILL: 2304 case WONT: 2305 return current+3; 2306 case SB: /* loop forever looking for the SE */ 2307 { 2308 register char *look = current+2; 2309 2310 for (;;) { 2311 if ((*look++&0xff) == IAC) { 2312 if ((*look++&0xff) == SE) { 2313 return look; 2314 } 2315 } 2316 } 2317 } 2318 default: 2319 return current+2; 2320 } 2321 } 2322 #endif /* 0 */ 2323 2324 /* 2325 * netclear() 2326 * 2327 * We are about to do a TELNET SYNCH operation. Clear 2328 * the path to the network. 2329 * 2330 * Things are a bit tricky since we may have sent the first 2331 * byte or so of a previous TELNET command into the network. 2332 * So, we have to scan the network buffer from the beginning 2333 * until we are up to where we want to be. 2334 * 2335 * A side effect of what we do, just to keep things 2336 * simple, is to clear the urgent data pointer. The principal 2337 * caller should be setting the urgent data pointer AFTER calling 2338 * us in any case. 2339 */ 2340 2341 static void 2342 netclear() 2343 { 2344 #if 0 /* XXX */ 2345 register char *thisitem, *next; 2346 char *good; 2347 #define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \ 2348 ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL)) 2349 2350 thisitem = netobuf; 2351 2352 while ((next = nextitem(thisitem)) <= netobuf.send) { 2353 thisitem = next; 2354 } 2355 2356 /* Now, thisitem is first before/at boundary. */ 2357 2358 good = netobuf; /* where the good bytes go */ 2359 2360 while (netoring.add > thisitem) { 2361 if (wewant(thisitem)) { 2362 int length; 2363 2364 next = thisitem; 2365 do { 2366 next = nextitem(next); 2367 } while (wewant(next) && (nfrontp > next)); 2368 length = next-thisitem; 2369 memmove(good, thisitem, length); 2370 good += length; 2371 thisitem = next; 2372 } else { 2373 thisitem = nextitem(thisitem); 2374 } 2375 } 2376 2377 #endif /* 0 */ 2378 } 2379 2380 /* 2382 * These routines add various telnet commands to the data stream. 2383 */ 2384 2385 static void 2386 doflush() 2387 { 2388 NET2ADD(IAC, DO); 2389 NETADD(TELOPT_TM); 2390 flushline = 1; 2391 flushout = 1; 2392 (void) ttyflush(1); /* Flush/drop output */ 2393 /* do printoption AFTER flush, otherwise the output gets tossed... */ 2394 printoption("SENT", DO, TELOPT_TM); 2395 } 2396 2397 void 2398 xmitAO() 2399 { 2400 NET2ADD(IAC, AO); 2401 printoption("SENT", IAC, AO); 2402 if (autoflush) { 2403 doflush(); 2404 } 2405 } 2406 2407 2408 void 2409 xmitEL() 2410 { 2411 NET2ADD(IAC, EL); 2412 printoption("SENT", IAC, EL); 2413 } 2414 2415 void 2416 xmitEC() 2417 { 2418 NET2ADD(IAC, EC); 2419 printoption("SENT", IAC, EC); 2420 } 2421 2422 2423 int 2424 dosynch(s) 2425 char *s; 2426 { 2427 netclear(); /* clear the path to the network */ 2428 NETADD(IAC); 2429 setneturg(); 2430 NETADD(DM); 2431 printoption("SENT", IAC, DM); 2432 return 1; 2433 } 2434 2435 int want_status_response = 0; 2436 2437 int 2438 get_status(s) 2439 char *s; 2440 { 2441 unsigned char tmp[16]; 2442 register unsigned char *cp; 2443 2444 if (my_want_state_is_dont(TELOPT_STATUS)) { 2445 printf("Remote side does not support STATUS option\n"); 2446 return 0; 2447 } 2448 cp = tmp; 2449 2450 *cp++ = IAC; 2451 *cp++ = SB; 2452 *cp++ = TELOPT_STATUS; 2453 *cp++ = TELQUAL_SEND; 2454 *cp++ = IAC; 2455 *cp++ = SE; 2456 if (NETROOM() >= cp - tmp) { 2457 ring_supply_data(&netoring, tmp, cp-tmp); 2458 printsub('>', tmp+2, cp - tmp - 2); 2459 } 2460 ++want_status_response; 2461 return 1; 2462 } 2463 2464 void 2465 intp() 2466 { 2467 NET2ADD(IAC, IP); 2468 printoption("SENT", IAC, IP); 2469 flushline = 1; 2470 if (autoflush) { 2471 doflush(); 2472 } 2473 if (autosynch) { 2474 dosynch(NULL); 2475 } 2476 } 2477 2478 void 2479 sendbrk() 2480 { 2481 NET2ADD(IAC, BREAK); 2482 printoption("SENT", IAC, BREAK); 2483 flushline = 1; 2484 if (autoflush) { 2485 doflush(); 2486 } 2487 if (autosynch) { 2488 dosynch(NULL); 2489 } 2490 } 2491 2492 void 2493 sendabort() 2494 { 2495 NET2ADD(IAC, ABORT); 2496 printoption("SENT", IAC, ABORT); 2497 flushline = 1; 2498 if (autoflush) { 2499 doflush(); 2500 } 2501 if (autosynch) { 2502 dosynch(NULL); 2503 } 2504 } 2505 2506 void 2507 sendsusp() 2508 { 2509 NET2ADD(IAC, SUSP); 2510 printoption("SENT", IAC, SUSP); 2511 flushline = 1; 2512 if (autoflush) { 2513 doflush(); 2514 } 2515 if (autosynch) { 2516 dosynch(NULL); 2517 } 2518 } 2519 2520 void 2521 sendeof() 2522 { 2523 NET2ADD(IAC, xEOF); 2524 printoption("SENT", IAC, xEOF); 2525 } 2526 2527 void 2528 sendayt() 2529 { 2530 NET2ADD(IAC, AYT); 2531 printoption("SENT", IAC, AYT); 2532 } 2533 2534 /* 2535 * Send a window size update to the remote system. 2536 */ 2537 2538 void 2539 sendnaws() 2540 { 2541 long rows, cols; 2542 unsigned char tmp[16]; 2543 register unsigned char *cp; 2544 2545 if (my_state_is_wont(TELOPT_NAWS)) 2546 return; 2547 2548 #define PUTSHORT(cp, x) { if ((*cp++ = ((x)>>8)&0xff) == IAC) *cp++ = IAC; \ 2549 if ((*cp++ = ((x))&0xff) == IAC) *cp++ = IAC; } 2550 2551 if (TerminalWindowSize(&rows, &cols) == 0) { /* Failed */ 2552 return; 2553 } 2554 2555 cp = tmp; 2556 2557 *cp++ = IAC; 2558 *cp++ = SB; 2559 *cp++ = TELOPT_NAWS; 2560 PUTSHORT(cp, cols); 2561 PUTSHORT(cp, rows); 2562 *cp++ = IAC; 2563 *cp++ = SE; 2564 if (NETROOM() >= cp - tmp) { 2565 ring_supply_data(&netoring, tmp, cp-tmp); 2566 printsub('>', tmp+2, cp - tmp - 2); 2567 } 2568 } 2569 2570 void 2571 tel_enter_binary(rw) 2572 int rw; 2573 { 2574 if (rw&1) 2575 send_do(TELOPT_BINARY, 1); 2576 if (rw&2) 2577 send_will(TELOPT_BINARY, 1); 2578 } 2579 2580 void 2581 tel_leave_binary(rw) 2582 int rw; 2583 { 2584 if (rw&1) 2585 send_dont(TELOPT_BINARY, 1); 2586 if (rw&2) 2587 send_wont(TELOPT_BINARY, 1); 2588 } 2589
Indexes created Sat Oct 25 16:10:12 GMT 2025