telnet.c revision 1.29
1 /* $NetBSD: telnet.c,v 1.29 2004/11/04 07:22:47 dsl 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)telnet.c 8.4 (Berkeley) 5/30/95"; 36 #else 37 __RCSID("$NetBSD: telnet.c,v 1.29 2004/11/04 07:22:47 dsl Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/param.h> 42 43 #include <signal.h> 44 #include <termcap.h> 45 #include <unistd.h> 46 /* By the way, we need to include curses.h before telnet.h since, 47 * among other things, telnet.h #defines 'DO', which is a variable 48 * declared in curses.h. 49 */ 50 51 #include <arpa/telnet.h> 52 53 #include <ctype.h> 54 55 #include "ring.h" 56 #include "defines.h" 57 #include "externs.h" 58 #include "types.h" 59 #include "general.h" 60 61 #include <libtelnet/misc.h> 62 #ifdef AUTHENTICATION 63 #include <libtelnet/auth.h> 64 #endif 65 #ifdef ENCRYPTION 66 #include <libtelnet/encrypt.h> 67 #endif 68 69 70 #define strip(x) ((my_want_state_is_wont(TELOPT_BINARY)) ? ((x)&0x7f) : (x)) 72 73 static unsigned char subbuffer[SUBBUFSIZE], 74 *subpointer, *subend; /* buffer for sub-options */ 75 #define SB_CLEAR() subpointer = subbuffer; 76 #define SB_TERM() { subend = subpointer; SB_CLEAR(); } 77 #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \ 78 *subpointer++ = (c); \ 79 } 80 81 #define SB_GET() ((*subpointer++)&0xff) 82 #define SB_PEEK() ((*subpointer)&0xff) 83 #define SB_EOF() (subpointer >= subend) 84 #define SB_LEN() (subend - subpointer) 85 86 char options[256]; /* The combined options */ 87 char do_dont_resp[256]; 88 char will_wont_resp[256]; 89 90 int 91 eight = 0, 92 autologin = 0, /* Autologin anyone? */ 93 skiprc = 0, 94 connected, 95 showoptions, 96 In3270, /* Are we in 3270 mode? */ 97 ISend, /* trying to send network data in */ 98 debug = 0, 99 crmod, 100 netdata, /* Print out network data flow */ 101 crlf, /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */ 102 #ifdef TN3270 103 noasynchtty = 0,/* User specified "-noasynch" on command line */ 104 noasynchnet = 0,/* User specified "-noasynch" on command line */ 105 askedSGA = 0, /* We have talked about suppress go ahead */ 106 #endif /* defined(TN3270) */ 107 telnetport, 108 SYNCHing, /* we are in TELNET SYNCH mode */ 109 flushout, /* flush output */ 110 autoflush = 0, /* flush output when interrupting? */ 111 autosynch, /* send interrupt characters with SYNCH? */ 112 localflow, /* we handle flow control locally */ 113 restartany, /* if flow control enabled, restart on any character */ 114 localchars, /* we recognize interrupt/quit */ 115 donelclchars, /* the user has set "localchars" */ 116 donebinarytoggle, /* the user has put us in binary */ 117 dontlecho, /* do we suppress local echoing right now? */ 118 globalmode, 119 doaddrlookup = 1, /* do a reverse address lookup? */ 120 clienteof = 0; 121 122 char *prompt = 0; 123 124 cc_t escape; 125 cc_t rlogin; 126 #ifdef KLUDGELINEMODE 127 cc_t echoc; 128 #endif 129 130 /* 131 * Telnet receiver states for fsm 132 */ 133 #define TS_DATA 0 134 #define TS_IAC 1 135 #define TS_WILL 2 136 #define TS_WONT 3 137 #define TS_DO 4 138 #define TS_DONT 5 139 #define TS_CR 6 140 #define TS_SB 7 /* sub-option collection */ 141 #define TS_SE 8 /* looking for sub-option end */ 142 143 static int telrcv_state; 144 #ifdef OLD_ENVIRON 145 unsigned char telopt_environ = TELOPT_NEW_ENVIRON; 146 #else 147 # define telopt_environ TELOPT_NEW_ENVIRON 148 #endif 149 150 jmp_buf toplevel = { 0 }; 151 152 int flushline; 153 int linemode; 154 155 #ifdef KLUDGELINEMODE 156 int kludgelinemode = 1; 157 #endif 158 159 static void dooption(int); 160 static void dontoption(int); 161 static void suboption(void); 162 static int telsnd(void); 163 static void netclear(void); 164 static void doflush(void); 165 166 /* 167 * The following are some clocks used to decide how to interpret 168 * the relationship between various variables. 169 */ 170 171 Clocks clocks; 172 173 #ifdef notdef 175 Modelist modelist[] = { 176 { "telnet command mode", COMMAND_LINE }, 177 { "character-at-a-time mode", 0 }, 178 { "character-at-a-time mode (local echo)", LOCAL_ECHO|LOCAL_CHARS }, 179 { "line-by-line mode (remote echo)", LINE | LOCAL_CHARS }, 180 { "line-by-line mode", LINE | LOCAL_ECHO | LOCAL_CHARS }, 181 { "line-by-line mode (local echoing suppressed)", LINE | LOCAL_CHARS }, 182 { "3270 mode", 0 }, 183 }; 184 #endif 185 186 187 /* 189 * Initialize telnet environment. 190 */ 191 192 void 193 init_telnet(void) 194 { 195 env_init(); 196 197 SB_CLEAR(); 198 ClearArray(options); 199 200 connected = In3270 = ISend = localflow = donebinarytoggle = 0; 201 #if defined(AUTHENTICATION) || defined(ENCRYPTION) 202 auth_encrypt_connect(connected); 203 #endif /* defined(AUTHENTICATION) || defined(ENCRYPTION) */ 204 restartany = -1; 205 206 SYNCHing = 0; 207 208 /* Don't change NetTrace */ 209 210 escape = CONTROL(']'); 211 rlogin = _POSIX_VDISABLE; 212 #ifdef KLUDGELINEMODE 213 echoc = CONTROL('E'); 214 #endif 215 216 flushline = 1; 217 telrcv_state = TS_DATA; 218 } 219 220 222 #ifdef notdef 223 #include <stdarg.h> 224 225 /*VARARGS*/ 226 static void 227 printring(Ring *ring, char *format, ...) 228 va_dcl 229 { 230 va_list ap; 231 char buffer[100]; /* where things go */ 232 char *ptr; 233 char *string; 234 int i; 235 236 va_start(ap, format); 237 238 ptr = buffer; 239 240 while ((i = *format++) != 0) { 241 if (i == '%') { 242 i = *format++; 243 switch (i) { 244 case 'c': 245 *ptr++ = va_arg(ap, int); 246 break; 247 case 's': 248 string = va_arg(ap, char *); 249 ring_supply_data(ring, buffer, ptr-buffer); 250 ring_supply_data(ring, string, strlen(string)); 251 ptr = buffer; 252 break; 253 case 0: 254 ExitString("printring: trailing %%.\n", 1); 255 /*NOTREACHED*/ 256 default: 257 ExitString("printring: unknown format character.\n", 1); 258 /*NOTREACHED*/ 259 } 260 } else { 261 *ptr++ = i; 262 } 263 } 264 va_end(ap); 265 ring_supply_data(ring, buffer, ptr-buffer); 266 } 267 #endif 268 269 /* 270 * These routines are in charge of sending option negotiations 271 * to the other side. 272 * 273 * The basic idea is that we send the negotiation if either side 274 * is in disagreement as to what the current state should be. 275 */ 276 277 void 278 send_do(int c, int init) 279 { 280 if (init) { 281 if (((do_dont_resp[c] == 0) && my_state_is_do(c)) || 282 my_want_state_is_do(c)) 283 return; 284 set_my_want_state_do(c); 285 do_dont_resp[c]++; 286 } 287 NET2ADD(IAC, DO); 288 NETADD(c); 289 printoption("SENT", DO, c); 290 } 291 292 void 293 send_dont(int c, int init) 294 { 295 if (init) { 296 if (((do_dont_resp[c] == 0) && my_state_is_dont(c)) || 297 my_want_state_is_dont(c)) 298 return; 299 set_my_want_state_dont(c); 300 do_dont_resp[c]++; 301 } 302 NET2ADD(IAC, DONT); 303 NETADD(c); 304 printoption("SENT", DONT, c); 305 } 306 307 void 308 send_will(int c, int init) 309 { 310 if (init) { 311 if (((will_wont_resp[c] == 0) && my_state_is_will(c)) || 312 my_want_state_is_will(c)) 313 return; 314 set_my_want_state_will(c); 315 will_wont_resp[c]++; 316 } 317 NET2ADD(IAC, WILL); 318 NETADD(c); 319 printoption("SENT", WILL, c); 320 } 321 322 void 323 send_wont(int c, int init) 324 { 325 if (init) { 326 if (((will_wont_resp[c] == 0) && my_state_is_wont(c)) || 327 my_want_state_is_wont(c)) 328 return; 329 set_my_want_state_wont(c); 330 will_wont_resp[c]++; 331 } 332 NET2ADD(IAC, WONT); 333 NETADD(c); 334 printoption("SENT", WONT, c); 335 } 336 337 338 void 339 willoption(int option) 340 { 341 int new_state_ok = 0; 342 343 if (do_dont_resp[option]) { 344 --do_dont_resp[option]; 345 if (do_dont_resp[option] && my_state_is_do(option)) 346 --do_dont_resp[option]; 347 } 348 349 if ((do_dont_resp[option] == 0) && my_want_state_is_dont(option)) { 350 351 switch (option) { 352 353 case TELOPT_ECHO: 354 # if defined(TN3270) 355 /* 356 * The following is a pain in the rear-end. 357 * Various IBM servers (some versions of Wiscnet, 358 * possibly Fibronics/Spartacus, and who knows who 359 * else) will NOT allow us to send "DO SGA" too early 360 * in the setup proceedings. On the other hand, 361 * 4.2 servers (telnetd) won't set SGA correctly. 362 * So, we are stuck. Empirically (but, based on 363 * a VERY small sample), the IBM servers don't send 364 * out anything about ECHO, so we postpone our sending 365 * "DO SGA" until we see "WILL ECHO" (which 4.2 servers 366 * DO send). 367 */ 368 { 369 if (askedSGA == 0) { 370 askedSGA = 1; 371 if (my_want_state_is_dont(TELOPT_SGA)) 372 send_do(TELOPT_SGA, 1); 373 } 374 } 375 /* Fall through */ 376 case TELOPT_EOR: 377 #endif /* defined(TN3270) */ 378 case TELOPT_BINARY: 379 case TELOPT_SGA: 380 settimer(modenegotiated); 381 /* FALL THROUGH */ 382 case TELOPT_STATUS: 383 #ifdef AUTHENTICATION 384 case TELOPT_AUTHENTICATION: 385 #ifdef ENCRYPTION 386 case TELOPT_ENCRYPT: 387 #endif /* ENCRYPTION */ 388 #endif 389 new_state_ok = 1; 390 break; 391 392 case TELOPT_TM: 393 if (flushout) 394 flushout = 0; 395 /* 396 * Special case for TM. If we get back a WILL, 397 * pretend we got back a WONT. 398 */ 399 set_my_want_state_dont(option); 400 set_my_state_dont(option); 401 return; /* Never reply to TM will's/wont's */ 402 403 case TELOPT_LINEMODE: 404 default: 405 break; 406 } 407 408 if (new_state_ok) { 409 set_my_want_state_do(option); 410 send_do(option, 0); 411 setconnmode(0); /* possibly set new tty mode */ 412 } else { 413 do_dont_resp[option]++; 414 send_dont(option, 0); 415 } 416 } 417 set_my_state_do(option); 418 #ifdef ENCRYPTION 419 if (option == TELOPT_ENCRYPT) 420 encrypt_send_support(); 421 #endif /* ENCRYPTION */ 422 } 423 424 void 425 wontoption(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(int option) 474 { 475 int new_state_ok = 0; 476 477 if (will_wont_resp[option]) { 478 --will_wont_resp[option]; 479 if (will_wont_resp[option] && my_state_is_will(option)) 480 --will_wont_resp[option]; 481 } 482 483 if (will_wont_resp[option] == 0) { 484 if (my_want_state_is_wont(option)) { 485 486 switch (option) { 487 488 case TELOPT_TM: 489 /* 490 * Special case for TM. We send a WILL, but pretend 491 * we sent WONT. 492 */ 493 send_will(option, 0); 494 set_my_want_state_wont(TELOPT_TM); 495 set_my_state_wont(TELOPT_TM); 496 return; 497 498 # if defined(TN3270) 499 case TELOPT_EOR: /* end of record */ 500 # endif /* defined(TN3270) */ 501 case TELOPT_BINARY: /* binary mode */ 502 case TELOPT_NAWS: /* window size */ 503 case TELOPT_TSPEED: /* terminal speed */ 504 case TELOPT_LFLOW: /* local flow control */ 505 case TELOPT_TTYPE: /* terminal type option */ 506 case TELOPT_SGA: /* no big deal */ 507 #ifdef ENCRYPTION 508 case TELOPT_ENCRYPT: /* encryption variable option */ 509 #endif /* ENCRYPTION */ 510 new_state_ok = 1; 511 break; 512 513 case TELOPT_NEW_ENVIRON: /* New environment variable option */ 514 #ifdef OLD_ENVIRON 515 if (my_state_is_will(TELOPT_OLD_ENVIRON)) 516 send_wont(TELOPT_OLD_ENVIRON, 1); /* turn off the old */ 517 goto env_common; 518 case TELOPT_OLD_ENVIRON: /* Old environment variable option */ 519 if (my_state_is_will(TELOPT_NEW_ENVIRON)) 520 break; /* Don't enable if new one is in use! */ 521 env_common: 522 telopt_environ = option; 523 #endif 524 new_state_ok = 1; 525 break; 526 527 #ifdef AUTHENTICATION 528 case TELOPT_AUTHENTICATION: 529 if (autologin) 530 new_state_ok = 1; 531 break; 532 #endif 533 534 case TELOPT_XDISPLOC: /* X Display location */ 535 if (env_getvalue((unsigned char *)"DISPLAY")) 536 new_state_ok = 1; 537 break; 538 539 case TELOPT_LINEMODE: 540 #ifdef KLUDGELINEMODE 541 kludgelinemode = 0; 542 send_do(TELOPT_SGA, 1); 543 #endif 544 set_my_want_state_will(TELOPT_LINEMODE); 545 send_will(option, 0); 546 set_my_state_will(TELOPT_LINEMODE); 547 slc_init(); 548 return; 549 550 case TELOPT_ECHO: /* We're never going to echo... */ 551 default: 552 break; 553 } 554 555 if (new_state_ok) { 556 set_my_want_state_will(option); 557 send_will(option, 0); 558 setconnmode(0); /* Set new tty mode */ 559 } else { 560 will_wont_resp[option]++; 561 send_wont(option, 0); 562 } 563 } else { 564 /* 565 * Handle options that need more things done after the 566 * other side has acknowledged the option. 567 */ 568 switch (option) { 569 case TELOPT_LINEMODE: 570 #ifdef KLUDGELINEMODE 571 kludgelinemode = 0; 572 send_do(TELOPT_SGA, 1); 573 #endif 574 set_my_state_will(option); 575 slc_init(); 576 send_do(TELOPT_SGA, 0); 577 return; 578 } 579 } 580 } 581 set_my_state_will(option); 582 } 583 584 static void 585 dontoption(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 separated 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(char *buf, char *name) 631 { 632 int n; 633 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((unsigned char)c)) 700 *cp = toupper((unsigned char)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(char *name, char **as, char **ae) 741 { 742 char **ap; 743 int n; 744 745 n = strlen(name) + 1; 746 for (ap = as; ap < ae; ap++) 747 if (strncasecmp(*ap, name, n) == 0) 748 return(0); 749 return (1); 750 } 751 752 #ifdef TERMCAP 753 char *termbuf; 754 755 /*ARGSUSED*/ 756 int 757 setup_term(char *tname, int fd, int *errp) 758 { 759 char zz[1024], *zz_ptr; 760 char *ext_tc, *newptr; 761 762 if ((termbuf = (char *) malloc(1024)) == NULL) 763 goto error; 764 765 if (tgetent(termbuf, tname) == 1) { 766 /* check for ZZ capability, which indicates termcap truncated */ 767 zz_ptr = zz; 768 if (tgetstr("ZZ", &zz_ptr) != NULL) { 769 /* it was, fish back the full termcap */ 770 sscanf(zz, "%p", &ext_tc); 771 if ((newptr = (char *) realloc(termbuf, 772 strlen(ext_tc) + 1)) 773 == NULL) { 774 goto error; 775 } 776 777 strlcpy(newptr, ext_tc, strlen(ext_tc) + 1); 778 termbuf = newptr; 779 } 780 781 if (errp) 782 *errp = 1; 783 return(0); 784 } 785 error: 786 if (errp) 787 *errp = 0; 788 return(-1); 789 } 790 #else 791 #define termbuf ttytype 792 extern char ttytype[]; 793 #endif 794 795 int resettermname = 1; 796 797 char * 798 gettermname(void) 799 { 800 char *tname; 801 static char **tnamep = 0; 802 static char **next; 803 int err; 804 805 if (resettermname) { 806 resettermname = 0; 807 if (tnamep && tnamep != unknown) 808 free(tnamep); 809 if ((tname = (char *)env_getvalue((unsigned char *)"TERM")) && 810 (setup_term(tname, 1, &err) == 0)) { 811 tnamep = mklist(termbuf, tname); 812 } else { 813 if (tname && ((int)strlen(tname) <= 40)) { 814 unknown[0] = tname; 815 upcase(tname); 816 } else 817 unknown[0] = name_unknown; 818 tnamep = unknown; 819 } 820 next = tnamep; 821 } 822 if (*next == 0) 823 next = tnamep; 824 return(*next++); 825 } 826 /* 827 * suboption() 828 * 829 * Look at the sub-option buffer, and try to be helpful to the other 830 * side. 831 * 832 * Currently we recognize: 833 * 834 * Terminal type, send request. 835 * Terminal speed (send request). 836 * Local flow control (is request). 837 * Linemode 838 */ 839 840 static void 841 suboption(void) 842 { 843 unsigned char subchar; 844 845 printsub('<', subbuffer, SB_LEN()+2); 846 switch (subchar = SB_GET()) { 847 case TELOPT_TTYPE: 848 if (my_want_state_is_wont(TELOPT_TTYPE)) 849 return; 850 if (SB_EOF() || SB_GET() != TELQUAL_SEND) { 851 return; 852 } else { 853 char *name; 854 unsigned char temp[50]; 855 int len; 856 857 #ifdef TN3270 858 if (tn3270_ttype()) { 859 return; 860 } 861 #endif /* defined(TN3270) */ 862 name = gettermname(); 863 len = strlen(name) + 4 + 2; 864 if (len < NETROOM()) { 865 sprintf((char *)temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE, 866 TELQUAL_IS, name, IAC, SE); 867 ring_supply_data(&netoring, temp, len); 868 printsub('>', &temp[2], len-2); 869 } else { 870 ExitString("No room in buffer for terminal type.\n", 1); 871 /*NOTREACHED*/ 872 } 873 } 874 break; 875 case TELOPT_TSPEED: 876 if (my_want_state_is_wont(TELOPT_TSPEED)) 877 return; 878 if (SB_EOF()) 879 return; 880 if (SB_GET() == TELQUAL_SEND) { 881 long ospeed, ispeed; 882 unsigned char temp[50]; 883 int len; 884 885 TerminalSpeeds(&ispeed, &ospeed); 886 887 sprintf((char *)temp, "%c%c%c%c%ld,%ld%c%c", IAC, SB, TELOPT_TSPEED, 888 TELQUAL_IS, (long)ospeed, (long)ispeed, IAC, SE); 889 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 890 891 if (len < NETROOM()) { 892 ring_supply_data(&netoring, temp, len); 893 printsub('>', temp+2, len - 2); 894 } 895 /*@*/ else printf("lm_will: not enough room in buffer\n"); 896 } 897 break; 898 case TELOPT_LFLOW: 899 if (my_want_state_is_wont(TELOPT_LFLOW)) 900 return; 901 if (SB_EOF()) 902 return; 903 switch(SB_GET()) { 904 case LFLOW_RESTART_ANY: 905 restartany = 1; 906 break; 907 case LFLOW_RESTART_XON: 908 restartany = 0; 909 break; 910 case LFLOW_ON: 911 localflow = 1; 912 break; 913 case LFLOW_OFF: 914 localflow = 0; 915 break; 916 default: 917 return; 918 } 919 setcommandmode(); 920 setconnmode(0); 921 break; 922 923 case TELOPT_LINEMODE: 924 if (my_want_state_is_wont(TELOPT_LINEMODE)) 925 return; 926 if (SB_EOF()) 927 return; 928 switch (SB_GET()) { 929 case WILL: 930 lm_will(subpointer, SB_LEN()); 931 break; 932 case WONT: 933 lm_wont(subpointer, SB_LEN()); 934 break; 935 case DO: 936 lm_do(subpointer, SB_LEN()); 937 break; 938 case DONT: 939 lm_dont(subpointer, SB_LEN()); 940 break; 941 case LM_SLC: 942 slc(subpointer, SB_LEN()); 943 break; 944 case LM_MODE: 945 lm_mode(subpointer, SB_LEN(), 0); 946 break; 947 default: 948 break; 949 } 950 break; 951 952 #ifdef OLD_ENVIRON 953 case TELOPT_OLD_ENVIRON: 954 #endif 955 case TELOPT_NEW_ENVIRON: 956 if (SB_EOF()) 957 return; 958 switch(SB_PEEK()) { 959 case TELQUAL_IS: 960 case TELQUAL_INFO: 961 if (my_want_state_is_dont(subchar)) 962 return; 963 break; 964 case TELQUAL_SEND: 965 if (my_want_state_is_wont(subchar)) { 966 return; 967 } 968 break; 969 default: 970 return; 971 } 972 env_opt(subpointer, SB_LEN()); 973 break; 974 975 case TELOPT_XDISPLOC: 976 if (my_want_state_is_wont(TELOPT_XDISPLOC)) 977 return; 978 if (SB_EOF()) 979 return; 980 if (SB_GET() == TELQUAL_SEND) { 981 unsigned char temp[50], *dp; 982 int len; 983 984 if ((dp = env_getvalue((unsigned char *)"DISPLAY")) == NULL) { 985 /* 986 * Something happened, we no longer have a DISPLAY 987 * variable. So, turn off the option. 988 */ 989 send_wont(TELOPT_XDISPLOC, 1); 990 break; 991 } 992 sprintf((char *)temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_XDISPLOC, 993 TELQUAL_IS, dp, IAC, SE); 994 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 995 996 if (len < NETROOM()) { 997 ring_supply_data(&netoring, temp, len); 998 printsub('>', temp+2, len - 2); 999 } 1000 /*@*/ else printf("lm_will: not enough room in buffer\n"); 1001 } 1002 break; 1003 1004 #ifdef AUTHENTICATION 1005 case TELOPT_AUTHENTICATION: { 1006 if (!autologin) 1007 break; 1008 if (SB_EOF()) 1009 return; 1010 switch(SB_GET()) { 1011 case TELQUAL_IS: 1012 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 1013 return; 1014 auth_is(subpointer, SB_LEN()); 1015 break; 1016 case TELQUAL_SEND: 1017 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 1018 return; 1019 auth_send(subpointer, SB_LEN()); 1020 break; 1021 case TELQUAL_REPLY: 1022 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 1023 return; 1024 auth_reply(subpointer, SB_LEN()); 1025 break; 1026 case TELQUAL_NAME: 1027 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 1028 return; 1029 auth_name(subpointer, SB_LEN()); 1030 break; 1031 } 1032 } 1033 break; 1034 #endif 1035 #ifdef ENCRYPTION 1036 case TELOPT_ENCRYPT: 1037 if (SB_EOF()) 1038 return; 1039 switch(SB_GET()) { 1040 case ENCRYPT_START: 1041 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 1042 return; 1043 encrypt_start(subpointer, SB_LEN()); 1044 break; 1045 case ENCRYPT_END: 1046 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 1047 return; 1048 encrypt_end(); 1049 break; 1050 case ENCRYPT_SUPPORT: 1051 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1052 return; 1053 encrypt_support(subpointer, SB_LEN()); 1054 break; 1055 case ENCRYPT_REQSTART: 1056 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1057 return; 1058 encrypt_request_start(subpointer, SB_LEN()); 1059 break; 1060 case ENCRYPT_REQEND: 1061 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1062 return; 1063 /* 1064 * We can always send an REQEND so that we cannot 1065 * get stuck encrypting. We should only get this 1066 * if we have been able to get in the correct mode 1067 * anyhow. 1068 */ 1069 encrypt_request_end(); 1070 break; 1071 case ENCRYPT_IS: 1072 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 1073 return; 1074 encrypt_is(subpointer, SB_LEN()); 1075 break; 1076 case ENCRYPT_REPLY: 1077 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1078 return; 1079 encrypt_reply(subpointer, SB_LEN()); 1080 break; 1081 case ENCRYPT_ENC_KEYID: 1082 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 1083 return; 1084 encrypt_enc_keyid(subpointer, SB_LEN()); 1085 break; 1086 case ENCRYPT_DEC_KEYID: 1087 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1088 return; 1089 encrypt_dec_keyid(subpointer, SB_LEN()); 1090 break; 1091 default: 1092 break; 1093 } 1094 break; 1095 #endif /* ENCRYPTION */ 1096 default: 1097 break; 1098 } 1099 } 1100 1101 static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE }; 1102 1103 void 1104 lm_will(unsigned char *cmd, int len) 1105 { 1106 if (len < 1) { 1107 /*@*/ printf("lm_will: no command!!!\n"); /* Should not happen... */ 1108 return; 1109 } 1110 switch(cmd[0]) { 1111 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 1112 default: 1113 str_lm[3] = DONT; 1114 str_lm[4] = cmd[0]; 1115 if (NETROOM() > sizeof(str_lm)) { 1116 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 1117 printsub('>', &str_lm[2], sizeof(str_lm)-2); 1118 } 1119 /*@*/ else printf("lm_will: not enough room in buffer\n"); 1120 break; 1121 } 1122 } 1123 1124 void 1125 lm_wont(unsigned char *cmd, int len) 1126 { 1127 if (len < 1) { 1128 /*@*/ printf("lm_wont: no command!!!\n"); /* Should not happen... */ 1129 return; 1130 } 1131 switch(cmd[0]) { 1132 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 1133 default: 1134 /* We are always DONT, so don't respond */ 1135 return; 1136 } 1137 } 1138 1139 void 1140 lm_do(unsigned char *cmd, int len) 1141 { 1142 if (len < 1) { 1143 /*@*/ printf("lm_do: no command!!!\n"); /* Should not happen... */ 1144 return; 1145 } 1146 switch(cmd[0]) { 1147 case LM_FORWARDMASK: 1148 default: 1149 str_lm[3] = WONT; 1150 str_lm[4] = cmd[0]; 1151 if (NETROOM() > sizeof(str_lm)) { 1152 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 1153 printsub('>', &str_lm[2], sizeof(str_lm)-2); 1154 } 1155 /*@*/ else printf("lm_do: not enough room in buffer\n"); 1156 break; 1157 } 1158 } 1159 1160 void 1161 lm_dont(unsigned char *cmd, int len) 1162 { 1163 if (len < 1) { 1164 /*@*/ printf("lm_dont: no command!!!\n"); /* Should not happen... */ 1165 return; 1166 } 1167 switch(cmd[0]) { 1168 case LM_FORWARDMASK: 1169 default: 1170 /* we are always WONT, so don't respond */ 1171 break; 1172 } 1173 } 1174 1175 static unsigned char str_lm_mode[] = { 1176 IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE 1177 }; 1178 1179 void 1180 lm_mode(unsigned char *cmd, int len, int init) 1181 { 1182 if (len != 1) 1183 return; 1184 if ((linemode&MODE_MASK&~MODE_ACK) == *cmd) 1185 return; 1186 if (*cmd&MODE_ACK) 1187 return; 1188 linemode = *cmd&(MODE_MASK&~MODE_ACK); 1189 str_lm_mode[4] = linemode; 1190 if (!init) 1191 str_lm_mode[4] |= MODE_ACK; 1192 if (NETROOM() > sizeof(str_lm_mode)) { 1193 ring_supply_data(&netoring, str_lm_mode, sizeof(str_lm_mode)); 1194 printsub('>', &str_lm_mode[2], sizeof(str_lm_mode)-2); 1195 } 1196 /*@*/ else printf("lm_mode: not enough room in buffer\n"); 1197 setconnmode(0); /* set changed mode */ 1198 } 1199 1200 1201 1203 /* 1204 * slc() 1205 * Handle special character suboption of LINEMODE. 1206 */ 1207 1208 struct spc { 1209 cc_t val; 1210 cc_t *valp; 1211 char flags; /* Current flags & level */ 1212 char mylevel; /* Maximum level & flags */ 1213 } spc_data[NSLC+1]; 1214 1215 #define SLC_IMPORT 0 1216 #define SLC_EXPORT 1 1217 #define SLC_RVALUE 2 1218 static int slc_mode = SLC_EXPORT; 1219 1220 void 1221 slc_init(void) 1222 { 1223 struct spc *spcp; 1224 1225 localchars = 1; 1226 for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) { 1227 spcp->val = 0; 1228 spcp->valp = 0; 1229 spcp->flags = spcp->mylevel = SLC_NOSUPPORT; 1230 } 1231 1232 #define initfunc(func, flags) { \ 1233 spcp = &spc_data[func]; \ 1234 if ((spcp->valp = tcval(func)) != NULL){ \ 1235 spcp->val = *spcp->valp; \ 1236 spcp->mylevel = SLC_VARIABLE|flags; \ 1237 } else { \ 1238 spcp->val = 0; \ 1239 spcp->mylevel = SLC_DEFAULT; \ 1240 } \ 1241 } 1242 1243 initfunc(SLC_SYNCH, 0); 1244 /* No BRK */ 1245 initfunc(SLC_AO, 0); 1246 initfunc(SLC_AYT, 0); 1247 /* No EOR */ 1248 initfunc(SLC_ABORT, SLC_FLUSHIN|SLC_FLUSHOUT); 1249 initfunc(SLC_EOF, 0); 1250 initfunc(SLC_SUSP, SLC_FLUSHIN); 1251 initfunc(SLC_EC, 0); 1252 initfunc(SLC_EL, 0); 1253 initfunc(SLC_EW, 0); 1254 initfunc(SLC_RP, 0); 1255 initfunc(SLC_LNEXT, 0); 1256 initfunc(SLC_XON, 0); 1257 initfunc(SLC_XOFF, 0); 1258 initfunc(SLC_FORW1, 0); 1259 initfunc(SLC_FORW2, 0); 1260 /* No FORW2 */ 1261 1262 initfunc(SLC_IP, SLC_FLUSHIN|SLC_FLUSHOUT); 1263 #undef initfunc 1264 1265 if (slc_mode == SLC_EXPORT) 1266 slc_export(); 1267 else 1268 slc_import(1); 1269 1270 } 1271 1272 void 1273 slcstate(void) 1274 { 1275 printf("Special characters are %s values\n", 1276 slc_mode == SLC_IMPORT ? "remote default" : 1277 slc_mode == SLC_EXPORT ? "local" : 1278 "remote"); 1279 } 1280 1281 void 1282 slc_mode_export(int n) 1283 { 1284 slc_mode = SLC_EXPORT; 1285 if (my_state_is_will(TELOPT_LINEMODE)) 1286 slc_export(); 1287 } 1288 1289 void 1290 slc_mode_import(int def) 1291 { 1292 slc_mode = def ? SLC_IMPORT : SLC_RVALUE; 1293 if (my_state_is_will(TELOPT_LINEMODE)) 1294 slc_import(def); 1295 } 1296 1297 unsigned char slc_import_val[] = { 1298 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE 1299 }; 1300 unsigned char slc_import_def[] = { 1301 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE 1302 }; 1303 1304 void 1305 slc_import(int def) 1306 { 1307 if (NETROOM() > sizeof(slc_import_val)) { 1308 if (def) { 1309 ring_supply_data(&netoring, slc_import_def, sizeof(slc_import_def)); 1310 printsub('>', &slc_import_def[2], sizeof(slc_import_def)-2); 1311 } else { 1312 ring_supply_data(&netoring, slc_import_val, sizeof(slc_import_val)); 1313 printsub('>', &slc_import_val[2], sizeof(slc_import_val)-2); 1314 } 1315 } 1316 /*@*/ else printf("slc_import: not enough room\n"); 1317 } 1318 1319 void 1320 slc_export(void) 1321 { 1322 struct spc *spcp; 1323 1324 TerminalDefaultChars(); 1325 1326 slc_start_reply(); 1327 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1328 if (spcp->mylevel != SLC_NOSUPPORT) { 1329 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1330 spcp->flags = SLC_NOSUPPORT; 1331 else 1332 spcp->flags = spcp->mylevel; 1333 if (spcp->valp) 1334 spcp->val = *spcp->valp; 1335 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1336 } 1337 } 1338 slc_end_reply(); 1339 (void)slc_update(); 1340 setconnmode(1); /* Make sure the character values are set */ 1341 } 1342 1343 void 1344 slc(unsigned char *cp, int len) 1345 { 1346 struct spc *spcp; 1347 int func,level; 1348 1349 slc_start_reply(); 1350 1351 for (; len >= 3; len -=3, cp +=3) { 1352 1353 func = cp[SLC_FUNC]; 1354 1355 if (func == 0) { 1356 /* 1357 * Client side: always ignore 0 function. 1358 */ 1359 continue; 1360 } 1361 if (func > NSLC) { 1362 if ((cp[SLC_FLAGS] & SLC_LEVELBITS) != SLC_NOSUPPORT) 1363 slc_add_reply(func, SLC_NOSUPPORT, 0); 1364 continue; 1365 } 1366 1367 spcp = &spc_data[func]; 1368 1369 level = cp[SLC_FLAGS]&(SLC_LEVELBITS|SLC_ACK); 1370 1371 if ((cp[SLC_VALUE] == (unsigned char)spcp->val) && 1372 ((level&SLC_LEVELBITS) == (spcp->flags&SLC_LEVELBITS))) { 1373 continue; 1374 } 1375 1376 if (level == (SLC_DEFAULT|SLC_ACK)) { 1377 /* 1378 * This is an error condition, the SLC_ACK 1379 * bit should never be set for the SLC_DEFAULT 1380 * level. Our best guess to recover is to 1381 * ignore the SLC_ACK bit. 1382 */ 1383 cp[SLC_FLAGS] &= ~SLC_ACK; 1384 } 1385 1386 if (level == ((spcp->flags&SLC_LEVELBITS)|SLC_ACK)) { 1387 spcp->val = (cc_t)cp[SLC_VALUE]; 1388 spcp->flags = cp[SLC_FLAGS]; /* include SLC_ACK */ 1389 continue; 1390 } 1391 1392 level &= ~SLC_ACK; 1393 1394 if (level <= (spcp->mylevel&SLC_LEVELBITS)) { 1395 spcp->flags = cp[SLC_FLAGS]|SLC_ACK; 1396 spcp->val = (cc_t)cp[SLC_VALUE]; 1397 } 1398 if (level == SLC_DEFAULT) { 1399 if ((spcp->mylevel&SLC_LEVELBITS) != SLC_DEFAULT) 1400 spcp->flags = spcp->mylevel; 1401 else 1402 spcp->flags = SLC_NOSUPPORT; 1403 } 1404 slc_add_reply(func, spcp->flags, spcp->val); 1405 } 1406 slc_end_reply(); 1407 if (slc_update()) 1408 setconnmode(1); /* set the new character values */ 1409 } 1410 1411 void 1412 slc_check(void) 1413 { 1414 struct spc *spcp; 1415 1416 slc_start_reply(); 1417 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1418 if (spcp->valp && spcp->val != *spcp->valp) { 1419 spcp->val = *spcp->valp; 1420 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1421 spcp->flags = SLC_NOSUPPORT; 1422 else 1423 spcp->flags = spcp->mylevel; 1424 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1425 } 1426 } 1427 slc_end_reply(); 1428 setconnmode(1); 1429 } 1430 1431 1432 unsigned char slc_reply[128]; 1433 unsigned char *slc_replyp; 1434 1435 void 1436 slc_start_reply(void) 1437 { 1438 slc_replyp = slc_reply; 1439 *slc_replyp++ = IAC; 1440 *slc_replyp++ = SB; 1441 *slc_replyp++ = TELOPT_LINEMODE; 1442 *slc_replyp++ = LM_SLC; 1443 } 1444 1445 void 1446 slc_add_reply(unsigned int func, unsigned int flags, cc_t value) 1447 { 1448 if ((*slc_replyp++ = func) == IAC) 1449 *slc_replyp++ = IAC; 1450 if ((*slc_replyp++ = flags) == IAC) 1451 *slc_replyp++ = IAC; 1452 if ((*slc_replyp++ = (unsigned char)value) == IAC) 1453 *slc_replyp++ = IAC; 1454 } 1455 1456 void 1457 slc_end_reply(void) 1458 { 1459 int len; 1460 1461 *slc_replyp++ = IAC; 1462 *slc_replyp++ = SE; 1463 len = slc_replyp - slc_reply; 1464 if (len <= 6) 1465 return; 1466 if (NETROOM() > len) { 1467 ring_supply_data(&netoring, slc_reply, slc_replyp - slc_reply); 1468 printsub('>', &slc_reply[2], slc_replyp - slc_reply - 2); 1469 } 1470 /*@*/else printf("slc_end_reply: not enough room\n"); 1471 } 1472 1473 int 1474 slc_update(void) 1475 { 1476 struct spc *spcp; 1477 int need_update = 0; 1478 1479 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1480 if (!(spcp->flags&SLC_ACK)) 1481 continue; 1482 spcp->flags &= ~SLC_ACK; 1483 if (spcp->valp && (*spcp->valp != spcp->val)) { 1484 *spcp->valp = spcp->val; 1485 need_update = 1; 1486 } 1487 } 1488 return(need_update); 1489 } 1490 1491 #ifdef OLD_ENVIRON 1492 # ifdef ENV_HACK 1493 /* 1494 * Earlier version of telnet/telnetd from the BSD code had 1495 * the definitions of VALUE and VAR reversed. To ensure 1496 * maximum interoperability, we assume that the server is 1497 * an older BSD server, until proven otherwise. The newer 1498 * BSD servers should be able to handle either definition, 1499 * so it is better to use the wrong values if we don't 1500 * know what type of server it is. 1501 */ 1502 int env_auto = 1; 1503 int old_env_var = OLD_ENV_VAR; 1504 int old_env_value = OLD_ENV_VALUE; 1505 # else 1506 # define old_env_var OLD_ENV_VAR 1507 # define old_env_value OLD_ENV_VALUE 1508 # endif 1509 #endif 1510 1511 void 1512 env_opt(unsigned char *buf, int len) 1513 { 1514 unsigned char *ep = 0, *epc = 0; 1515 int i; 1516 1517 switch(buf[0]&0xff) { 1518 case TELQUAL_SEND: 1519 env_opt_start(); 1520 if (len == 1) { 1521 env_opt_add(NULL); 1522 } else for (i = 1; i < len; i++) { 1523 switch (buf[i]&0xff) { 1524 #ifdef OLD_ENVIRON 1525 case OLD_ENV_VAR: 1526 # ifdef ENV_HACK 1527 if (telopt_environ == TELOPT_OLD_ENVIRON 1528 && env_auto) { 1529 /* Server has the same definitions */ 1530 old_env_var = OLD_ENV_VAR; 1531 old_env_value = OLD_ENV_VALUE; 1532 } 1533 /* FALL THROUGH */ 1534 # endif 1535 case OLD_ENV_VALUE: 1536 /* 1537 * Although OLD_ENV_VALUE is not legal, we will 1538 * still recognize it, just in case it is an 1539 * old server that has VAR & VALUE mixed up... 1540 */ 1541 /* FALL THROUGH */ 1542 #else 1543 case NEW_ENV_VAR: 1544 #endif 1545 case ENV_USERVAR: 1546 if (ep) { 1547 *epc = 0; 1548 env_opt_add(ep); 1549 } 1550 ep = epc = &buf[i+1]; 1551 break; 1552 case ENV_ESC: 1553 i++; 1554 /*FALL THROUGH*/ 1555 default: 1556 if (epc) 1557 *epc++ = buf[i]; 1558 break; 1559 } 1560 } 1561 if (ep) { 1562 *epc = 0; 1563 env_opt_add(ep); 1564 } 1565 env_opt_end(1); 1566 break; 1567 1568 case TELQUAL_IS: 1569 case TELQUAL_INFO: 1570 /* Ignore for now. We shouldn't get it anyway. */ 1571 break; 1572 1573 default: 1574 break; 1575 } 1576 } 1577 1578 #define OPT_REPLY_SIZE 256 1579 unsigned char *opt_reply; 1580 unsigned char *opt_replyp; 1581 unsigned char *opt_replyend; 1582 1583 void 1584 env_opt_start(void) 1585 { 1586 unsigned char *p; 1587 1588 if (opt_reply) { 1589 p = (unsigned char *)realloc(opt_reply, OPT_REPLY_SIZE); 1590 if (p == NULL) 1591 free(opt_reply); 1592 } else 1593 p = (unsigned char *)malloc(OPT_REPLY_SIZE); 1594 opt_reply = p; 1595 if (opt_reply == NULL) { 1596 /*@*/ printf("env_opt_start: malloc()/realloc() failed!!!\n"); 1597 opt_reply = opt_replyp = opt_replyend = NULL; 1598 return; 1599 } 1600 opt_replyp = opt_reply; 1601 opt_replyend = opt_reply + OPT_REPLY_SIZE; 1602 *opt_replyp++ = IAC; 1603 *opt_replyp++ = SB; 1604 *opt_replyp++ = telopt_environ; 1605 *opt_replyp++ = TELQUAL_IS; 1606 } 1607 1608 void 1609 env_opt_start_info(void) 1610 { 1611 env_opt_start(); 1612 if (opt_replyp) 1613 opt_replyp[-1] = TELQUAL_INFO; 1614 } 1615 1616 void 1617 env_opt_add(unsigned char *ep) 1618 { 1619 unsigned char *vp, c; 1620 1621 if (opt_reply == NULL) /*XXX*/ 1622 return; /*XXX*/ 1623 1624 if (ep == NULL || *ep == '\0') { 1625 /* Send user defined variables first. */ 1626 env_default(1, 0); 1627 while ((ep = env_default(0, 0)) != NULL) 1628 env_opt_add(ep); 1629 1630 /* Now add the list of well know variables. */ 1631 env_default(1, 1); 1632 while ((ep = env_default(0, 1)) != NULL) 1633 env_opt_add(ep); 1634 return; 1635 } 1636 vp = env_getvalue(ep); 1637 if (opt_replyp + (vp ? strlen((char *)vp) : 0) + 1638 strlen((char *)ep) + 6 > opt_replyend) 1639 { 1640 int len; 1641 unsigned char *p; 1642 opt_replyend += OPT_REPLY_SIZE; 1643 len = opt_replyend - opt_reply; 1644 p = (unsigned char *)realloc(opt_reply, len); 1645 if (p == NULL) 1646 free(opt_reply); 1647 opt_reply = p; 1648 if (opt_reply == NULL) { 1649 /*@*/ printf("env_opt_add: realloc() failed!!!\n"); 1650 opt_reply = opt_replyp = opt_replyend = NULL; 1651 return; 1652 } 1653 opt_replyp = opt_reply + len - (opt_replyend - opt_replyp); 1654 opt_replyend = opt_reply + len; 1655 } 1656 if (opt_welldefined(ep)) 1657 #ifdef OLD_ENVIRON 1658 if (telopt_environ == TELOPT_OLD_ENVIRON) 1659 *opt_replyp++ = old_env_var; 1660 else 1661 #endif 1662 *opt_replyp++ = NEW_ENV_VAR; 1663 else 1664 *opt_replyp++ = ENV_USERVAR; 1665 for (;;) { 1666 while ((c = *ep++) != '\0') { 1667 switch(c&0xff) { 1668 case IAC: 1669 *opt_replyp++ = IAC; 1670 break; 1671 case NEW_ENV_VAR: 1672 case NEW_ENV_VALUE: 1673 case ENV_ESC: 1674 case ENV_USERVAR: 1675 *opt_replyp++ = ENV_ESC; 1676 break; 1677 } 1678 *opt_replyp++ = c; 1679 } 1680 if ((ep = vp) != NULL) { 1681 #ifdef OLD_ENVIRON 1682 if (telopt_environ == TELOPT_OLD_ENVIRON) 1683 *opt_replyp++ = old_env_value; 1684 else 1685 #endif 1686 *opt_replyp++ = NEW_ENV_VALUE; 1687 vp = NULL; 1688 } else 1689 break; 1690 } 1691 } 1692 1693 int 1694 opt_welldefined(char *ep) 1695 { 1696 if ((strcmp(ep, "USER") == 0) || 1697 (strcmp(ep, "DISPLAY") == 0) || 1698 (strcmp(ep, "PRINTER") == 0) || 1699 (strcmp(ep, "SYSTEMTYPE") == 0) || 1700 (strcmp(ep, "JOB") == 0) || 1701 (strcmp(ep, "ACCT") == 0)) 1702 return(1); 1703 return(0); 1704 } 1705 void 1706 env_opt_end(int emptyok) 1707 { 1708 int len; 1709 1710 len = opt_replyp - opt_reply + 2; 1711 if (emptyok || len > 6) { 1712 *opt_replyp++ = IAC; 1713 *opt_replyp++ = SE; 1714 if (NETROOM() > len) { 1715 ring_supply_data(&netoring, opt_reply, len); 1716 printsub('>', &opt_reply[2], len - 2); 1717 } 1718 /*@*/ else printf("slc_end_reply: not enough room\n"); 1719 } 1720 if (opt_reply) { 1721 free(opt_reply); 1722 opt_reply = opt_replyp = opt_replyend = NULL; 1723 } 1724 } 1725 1726 1727 1729 int 1730 telrcv(void) 1731 { 1732 int c; 1733 int scc; 1734 unsigned char *sbp = NULL; 1735 int count; 1736 int returnValue = 0; 1737 1738 scc = 0; 1739 count = 0; 1740 while (TTYROOM() > 2) { 1741 if (scc == 0) { 1742 if (count) { 1743 ring_consumed(&netiring, count); 1744 returnValue = 1; 1745 count = 0; 1746 } 1747 sbp = netiring.consume; 1748 scc = ring_full_consecutive(&netiring); 1749 if (scc == 0) { 1750 /* No more data coming in */ 1751 break; 1752 } 1753 } 1754 1755 c = *sbp++ & 0xff, scc--; count++; 1756 #ifdef ENCRYPTION 1757 if (decrypt_input) 1758 c = (*decrypt_input)(c); 1759 #endif /* ENCRYPTION */ 1760 1761 switch (telrcv_state) { 1762 1763 case TS_CR: 1764 telrcv_state = TS_DATA; 1765 if (c == '\0') { 1766 break; /* Ignore \0 after CR */ 1767 } 1768 else if ((c == '\n') && my_want_state_is_dont(TELOPT_ECHO) && !crmod) { 1769 TTYADD(c); 1770 break; 1771 } 1772 /* Else, fall through */ 1773 1774 case TS_DATA: 1775 if (c == IAC) { 1776 telrcv_state = TS_IAC; 1777 break; 1778 } 1779 # if defined(TN3270) 1780 if (In3270) { 1781 *Ifrontp++ = c; 1782 while (scc > 0) { 1783 c = *sbp++ & 0377, scc--; count++; 1784 #ifdef ENCRYPTION 1785 if (decrypt_input) 1786 c = (*decrypt_input)(c); 1787 #endif /* ENCRYPTION */ 1788 if (c == IAC) { 1789 telrcv_state = TS_IAC; 1790 break; 1791 } 1792 *Ifrontp++ = c; 1793 } 1794 } else 1795 # endif /* defined(TN3270) */ 1796 /* 1797 * The 'crmod' hack (see following) is needed 1798 * since we can't * set CRMOD on output only. 1799 * Machines like MULTICS like to send \r without 1800 * \n; since we must turn off CRMOD to get proper 1801 * input, the mapping is done here (sigh). 1802 */ 1803 if ((c == '\r') && my_want_state_is_dont(TELOPT_BINARY)) { 1804 if (scc > 0) { 1805 c = *sbp&0xff; 1806 #ifdef ENCRYPTION 1807 if (decrypt_input) 1808 c = (*decrypt_input)(c); 1809 #endif /* ENCRYPTION */ 1810 if (c == 0) { 1811 sbp++, scc--; count++; 1812 /* a "true" CR */ 1813 TTYADD('\r'); 1814 } else if (my_want_state_is_dont(TELOPT_ECHO) && 1815 (c == '\n')) { 1816 sbp++, scc--; count++; 1817 TTYADD('\n'); 1818 } else { 1819 #ifdef ENCRYPTION 1820 if (decrypt_input) 1821 (*decrypt_input)(-1); 1822 #endif /* ENCRYPTION */ 1823 1824 TTYADD('\r'); 1825 if (crmod) { 1826 TTYADD('\n'); 1827 } 1828 } 1829 } else { 1830 telrcv_state = TS_CR; 1831 TTYADD('\r'); 1832 if (crmod) { 1833 TTYADD('\n'); 1834 } 1835 } 1836 } else { 1837 TTYADD(c); 1838 } 1839 continue; 1840 1841 case TS_IAC: 1842 process_iac: 1843 switch (c) { 1844 1845 case WILL: 1846 telrcv_state = TS_WILL; 1847 continue; 1848 1849 case WONT: 1850 telrcv_state = TS_WONT; 1851 continue; 1852 1853 case DO: 1854 telrcv_state = TS_DO; 1855 continue; 1856 1857 case DONT: 1858 telrcv_state = TS_DONT; 1859 continue; 1860 1861 case DM: 1862 /* 1863 * We may have missed an urgent notification, 1864 * so make sure we flush whatever is in the 1865 * buffer currently. 1866 */ 1867 printoption("RCVD", IAC, DM); 1868 SYNCHing = 1; 1869 (void) ttyflush(1); 1870 SYNCHing = stilloob(); 1871 settimer(gotDM); 1872 break; 1873 1874 case SB: 1875 SB_CLEAR(); 1876 telrcv_state = TS_SB; 1877 continue; 1878 1879 # if defined(TN3270) 1880 case EOR: 1881 if (In3270) { 1882 if (Ibackp == Ifrontp) { 1883 Ibackp = Ifrontp = Ibuf; 1884 ISend = 0; /* should have been! */ 1885 } else { 1886 Ibackp += DataFromNetwork(Ibackp, Ifrontp-Ibackp, 1); 1887 ISend = 1; 1888 } 1889 } 1890 printoption("RCVD", IAC, EOR); 1891 break; 1892 # endif /* defined(TN3270) */ 1893 1894 case IAC: 1895 # if !defined(TN3270) 1896 TTYADD(IAC); 1897 # else /* !defined(TN3270) */ 1898 if (In3270) { 1899 *Ifrontp++ = IAC; 1900 } else { 1901 TTYADD(IAC); 1902 } 1903 # endif /* !defined(TN3270) */ 1904 break; 1905 1906 case NOP: 1907 case GA: 1908 default: 1909 printoption("RCVD", IAC, c); 1910 break; 1911 } 1912 telrcv_state = TS_DATA; 1913 continue; 1914 1915 case TS_WILL: 1916 printoption("RCVD", WILL, c); 1917 willoption(c); 1918 SetIn3270(); 1919 telrcv_state = TS_DATA; 1920 continue; 1921 1922 case TS_WONT: 1923 printoption("RCVD", WONT, c); 1924 wontoption(c); 1925 SetIn3270(); 1926 telrcv_state = TS_DATA; 1927 continue; 1928 1929 case TS_DO: 1930 printoption("RCVD", DO, c); 1931 dooption(c); 1932 SetIn3270(); 1933 if (c == TELOPT_NAWS) { 1934 sendnaws(); 1935 } else if (c == TELOPT_LFLOW) { 1936 localflow = 1; 1937 setcommandmode(); 1938 setconnmode(0); 1939 } 1940 telrcv_state = TS_DATA; 1941 continue; 1942 1943 case TS_DONT: 1944 printoption("RCVD", DONT, c); 1945 dontoption(c); 1946 flushline = 1; 1947 setconnmode(0); /* set new tty mode (maybe) */ 1948 SetIn3270(); 1949 telrcv_state = TS_DATA; 1950 continue; 1951 1952 case TS_SB: 1953 if (c == IAC) { 1954 telrcv_state = TS_SE; 1955 } else { 1956 SB_ACCUM(c); 1957 } 1958 continue; 1959 1960 case TS_SE: 1961 if (c != SE) { 1962 if (c != IAC) { 1963 /* 1964 * This is an error. We only expect to get 1965 * "IAC IAC" or "IAC SE". Several things may 1966 * have happened. An IAC was not doubled, the 1967 * IAC SE was left off, or another option got 1968 * inserted into the suboption are all possibilities. 1969 * If we assume that the IAC was not doubled, 1970 * and really the IAC SE was left off, we could 1971 * get into an infinite loop here. So, instead, 1972 * we terminate the suboption, and process the 1973 * partial suboption if we can. 1974 */ 1975 SB_ACCUM(IAC); 1976 SB_ACCUM(c); 1977 subpointer -= 2; 1978 SB_TERM(); 1979 1980 printoption("In SUBOPTION processing, RCVD", IAC, c); 1981 suboption(); /* handle sub-option */ 1982 SetIn3270(); 1983 telrcv_state = TS_IAC; 1984 goto process_iac; 1985 } 1986 SB_ACCUM(c); 1987 telrcv_state = TS_SB; 1988 } else { 1989 SB_ACCUM(IAC); 1990 SB_ACCUM(SE); 1991 subpointer -= 2; 1992 SB_TERM(); 1993 suboption(); /* handle sub-option */ 1994 SetIn3270(); 1995 telrcv_state = TS_DATA; 1996 } 1997 } 1998 } 1999 if (count) 2000 ring_consumed(&netiring, count); 2001 return returnValue||count; 2002 } 2003 2004 static int bol = 1, local = 0; 2005 2006 int 2007 rlogin_susp(void) 2008 { 2009 if (local) { 2010 local = 0; 2011 bol = 1; 2012 command(0, "z\n", 2); 2013 return(1); 2014 } 2015 return(0); 2016 } 2017 2018 static int 2019 telsnd(void) 2020 { 2021 int tcc; 2022 int count; 2023 int returnValue = 0; 2024 unsigned char *tbp = NULL; 2025 2026 tcc = 0; 2027 count = 0; 2028 while (NETROOM() > 2) { 2029 int sc; 2030 int c; 2031 2032 if (tcc == 0) { 2033 if (count) { 2034 ring_consumed(&ttyiring, count); 2035 returnValue = 1; 2036 count = 0; 2037 } 2038 tbp = ttyiring.consume; 2039 tcc = ring_full_consecutive(&ttyiring); 2040 if (tcc == 0) { 2041 break; 2042 } 2043 } 2044 c = *tbp++ & 0xff, sc = strip(c), tcc--; count++; 2045 if (rlogin != _POSIX_VDISABLE) { 2046 if (bol) { 2047 bol = 0; 2048 if (sc == rlogin) { 2049 local = 1; 2050 continue; 2051 } 2052 } else if (local) { 2053 local = 0; 2054 if (sc == '.' || c == termEofChar) { 2055 bol = 1; 2056 command(0, "close\n", 6); 2057 continue; 2058 } 2059 if (sc == termSuspChar) { 2060 bol = 1; 2061 command(0, "z\n", 2); 2062 continue; 2063 } 2064 if (sc == escape) { 2065 command(0, (char *)tbp, tcc); 2066 bol = 1; 2067 count += tcc; 2068 tcc = 0; 2069 flushline = 1; 2070 break; 2071 } 2072 if (sc != rlogin) { 2073 ++tcc; 2074 --tbp; 2075 --count; 2076 c = sc = rlogin; 2077 } 2078 } 2079 if ((sc == '\n') || (sc == '\r')) 2080 bol = 1; 2081 } else if (sc == escape && escape != _POSIX_VDISABLE) { 2082 /* 2083 * Double escape is a pass through of a single escape character. 2084 */ 2085 if (tcc && strip(*tbp) == escape) { 2086 tbp++; 2087 tcc--; 2088 count++; 2089 bol = 0; 2090 } else { 2091 command(0, (char *)tbp, tcc); 2092 bol = 1; 2093 count += tcc; 2094 tcc = 0; 2095 flushline = 1; 2096 break; 2097 } 2098 } else 2099 bol = 0; 2100 #ifdef KLUDGELINEMODE 2101 if (kludgelinemode && (globalmode&MODE_EDIT) && (sc == echoc)) { 2102 if (tcc > 0 && strip(*tbp) == echoc) { 2103 tcc--; tbp++; count++; 2104 } else { 2105 dontlecho = !dontlecho; 2106 settimer(echotoggle); 2107 setconnmode(0); 2108 flushline = 1; 2109 break; 2110 } 2111 } 2112 #endif 2113 if (sc != _POSIX_VDISABLE && MODE_LOCAL_CHARS(globalmode)) { 2114 if (TerminalSpecialChars(sc) == 0) { 2115 bol = 1; 2116 break; 2117 } 2118 } 2119 if (my_want_state_is_wont(TELOPT_BINARY)) { 2120 switch (c) { 2121 case '\n': 2122 /* 2123 * If we are in CRMOD mode (\r ==> \n) 2124 * on our local machine, then probably 2125 * a newline (unix) is CRLF (TELNET). 2126 */ 2127 if (MODE_LOCAL_CHARS(globalmode)) { 2128 NETADD('\r'); 2129 } 2130 NETADD('\n'); 2131 bol = flushline = 1; 2132 break; 2133 case '\r': 2134 if (!crlf) { 2135 NET2ADD('\r', '\0'); 2136 } else { 2137 NET2ADD('\r', '\n'); 2138 } 2139 bol = flushline = 1; 2140 break; 2141 case IAC: 2142 NET2ADD(IAC, IAC); 2143 break; 2144 default: 2145 NETADD(c); 2146 break; 2147 } 2148 } else if (c == IAC) { 2149 NET2ADD(IAC, IAC); 2150 } else { 2151 NETADD(c); 2152 } 2153 } 2154 if (count) 2155 ring_consumed(&ttyiring, count); 2156 return returnValue||count; /* Non-zero if we did anything */ 2157 } 2158 2159 /* 2161 * Scheduler() 2162 * 2163 * Try to do something. 2164 * 2165 * If we do something useful, return 1; else return 0. 2166 * 2167 */ 2168 2169 2170 int 2171 Scheduler(int block) /* should we block in the select ? */ 2172 { 2173 /* One wants to be a bit careful about setting returnValue 2174 * to one, since a one implies we did some useful work, 2175 * and therefore probably won't be called to block next 2176 * time (TN3270 mode only). 2177 */ 2178 int returnValue; 2179 int netin, netout, netex, ttyin, ttyout; 2180 2181 /* Decide which rings should be processed */ 2182 2183 netout = ring_full_count(&netoring) && 2184 (flushline || 2185 (my_want_state_is_wont(TELOPT_LINEMODE) 2186 #ifdef KLUDGELINEMODE 2187 && (!kludgelinemode || my_want_state_is_do(TELOPT_SGA)) 2188 #endif 2189 ) || 2190 my_want_state_is_will(TELOPT_BINARY)); 2191 ttyout = ring_full_count(&ttyoring); 2192 2193 #ifdef TN3270 2194 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0) && (shell_active == 0); 2195 #else /* defined(TN3270) */ 2196 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0); 2197 #endif /* defined(TN3270) */ 2198 2199 #ifdef TN3270 2200 netin = ring_empty_count(&netiring); 2201 # else /* !defined(TN3270) */ 2202 netin = !ISend && ring_empty_count(&netiring); 2203 # endif /* !defined(TN3270) */ 2204 2205 netex = !SYNCHing; 2206 2207 /* If we have seen a signal recently, reset things */ 2208 # ifdef TN3270 2209 if (HaveInput) { 2210 HaveInput = 0; 2211 (void) signal(SIGIO, inputAvailable); 2212 } 2213 #endif /* defined(TN3270) */ 2214 2215 /* Call to system code to process rings */ 2216 2217 returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block); 2218 2219 /* Now, look at the input rings, looking for work to do. */ 2220 2221 if (ring_full_count(&ttyiring)) { 2222 # if defined(TN3270) 2223 if (In3270) { 2224 int c; 2225 2226 c = DataFromTerminal(ttyiring.consume, 2227 ring_full_consecutive(&ttyiring)); 2228 if (c) { 2229 returnValue = 1; 2230 ring_consumed(&ttyiring, c); 2231 } 2232 } else { 2233 # endif /* defined(TN3270) */ 2234 returnValue |= telsnd(); 2235 # if defined(TN3270) 2236 } 2237 # endif /* defined(TN3270) */ 2238 } 2239 2240 if (ring_full_count(&netiring)) { 2241 # if !defined(TN3270) 2242 returnValue |= telrcv(); 2243 # else /* !defined(TN3270) */ 2244 returnValue = Push3270(); 2245 # endif /* !defined(TN3270) */ 2246 } 2247 return returnValue; 2248 } 2249 2250 /* 2252 * Select from tty and network... 2253 */ 2254 void 2255 telnet(const char *user) 2256 { 2257 sys_telnet_init(); 2258 2259 #if defined(AUTHENTICATION) || defined(ENCRYPTION) 2260 { 2261 static char local_host[MAXHOSTNAMELEN + 1] = { 0 }; 2262 2263 if (!local_host[0]) { 2264 gethostname(local_host, sizeof(local_host)); 2265 local_host[sizeof(local_host)-1] = 0; 2266 } 2267 auth_encrypt_init(local_host, hostname, "TELNET", 0); 2268 auth_encrypt_user(user); 2269 } 2270 #endif /* defined(AUTHENTICATION) || defined(ENCRYPTION) */ 2271 # if !defined(TN3270) 2272 if (telnetport) { 2273 #ifdef AUTHENTICATION 2274 if (autologin) 2275 send_will(TELOPT_AUTHENTICATION, 1); 2276 #endif 2277 #ifdef ENCRYPTION 2278 send_do(TELOPT_ENCRYPT, 1); 2279 send_will(TELOPT_ENCRYPT, 1); 2280 #endif /* ENCRYPTION */ 2281 send_do(TELOPT_SGA, 1); 2282 send_will(TELOPT_TTYPE, 1); 2283 send_will(TELOPT_NAWS, 1); 2284 send_will(TELOPT_TSPEED, 1); 2285 send_will(TELOPT_LFLOW, 1); 2286 send_will(TELOPT_LINEMODE, 1); 2287 send_will(TELOPT_NEW_ENVIRON, 1); 2288 send_do(TELOPT_STATUS, 1); 2289 if (env_getvalue((unsigned char *)"DISPLAY")) 2290 send_will(TELOPT_XDISPLOC, 1); 2291 if (eight) 2292 tel_enter_binary(eight); 2293 } 2294 # endif /* !defined(TN3270) */ 2295 2296 # if !defined(TN3270) 2297 for (;;) { 2298 int schedValue; 2299 2300 while ((schedValue = Scheduler(0)) != 0) { 2301 if (schedValue == -1) { 2302 setcommandmode(); 2303 return; 2304 } 2305 } 2306 2307 if (Scheduler(1) == -1) { 2308 setcommandmode(); 2309 return; 2310 } 2311 } 2312 # else /* !defined(TN3270) */ 2313 for (;;) { 2314 int schedValue; 2315 2316 while (!In3270 && !shell_active) { 2317 if (Scheduler(1) == -1) { 2318 setcommandmode(); 2319 return; 2320 } 2321 } 2322 2323 while ((schedValue = Scheduler(0)) != 0) { 2324 if (schedValue == -1) { 2325 setcommandmode(); 2326 return; 2327 } 2328 } 2329 /* If there is data waiting to go out to terminal, don't 2330 * schedule any more data for the terminal. 2331 */ 2332 if (ring_full_count(&ttyoring)) { 2333 schedValue = 1; 2334 } else { 2335 if (shell_active) { 2336 if (shell_continue() == 0) { 2337 ConnectScreen(); 2338 } 2339 } else if (In3270) { 2340 schedValue = DoTerminalOutput(); 2341 } 2342 } 2343 if (schedValue && (shell_active == 0)) { 2344 if (Scheduler(1) == -1) { 2345 setcommandmode(); 2346 return; 2347 } 2348 } 2349 } 2350 # endif /* !defined(TN3270) */ 2351 } 2352 2353 #if 0 /* XXX - this not being in is a bug */ 2355 /* 2356 * nextitem() 2357 * 2358 * Return the address of the next "item" in the TELNET data 2359 * stream. This will be the address of the next character if 2360 * the current address is a user data character, or it will 2361 * be the address of the character following the TELNET command 2362 * if the current address is a TELNET IAC ("I Am a Command") 2363 * character. 2364 */ 2365 2366 static char * 2367 nextitem(char *current) 2368 { 2369 if ((*current&0xff) != IAC) { 2370 return current+1; 2371 } 2372 switch (*(current+1)&0xff) { 2373 case DO: 2374 case DONT: 2375 case WILL: 2376 case WONT: 2377 return current+3; 2378 case SB: /* loop forever looking for the SE */ 2379 { 2380 char *look = current+2; 2381 2382 for (;;) { 2383 if ((*look++&0xff) == IAC) { 2384 if ((*look++&0xff) == SE) { 2385 return look; 2386 } 2387 } 2388 } 2389 } 2390 default: 2391 return current+2; 2392 } 2393 } 2394 #endif /* 0 */ 2395 2396 /* 2397 * netclear() 2398 * 2399 * We are about to do a TELNET SYNCH operation. Clear 2400 * the path to the network. 2401 * 2402 * Things are a bit tricky since we may have sent the first 2403 * byte or so of a previous TELNET command into the network. 2404 * So, we have to scan the network buffer from the beginning 2405 * until we are up to where we want to be. 2406 * 2407 * A side effect of what we do, just to keep things 2408 * simple, is to clear the urgent data pointer. The principal 2409 * caller should be setting the urgent data pointer AFTER calling 2410 * us in any case. 2411 */ 2412 2413 static void 2414 netclear(void) 2415 { 2416 #if 0 /* XXX */ 2417 char *thisitem, *next; 2418 char *good; 2419 #define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \ 2420 ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL)) 2421 2422 thisitem = netobuf; 2423 2424 while ((next = nextitem(thisitem)) <= netobuf.send) { 2425 thisitem = next; 2426 } 2427 2428 /* Now, thisitem is first before/at boundary. */ 2429 2430 good = netobuf; /* where the good bytes go */ 2431 2432 while (netoring.add > thisitem) { 2433 if (wewant(thisitem)) { 2434 int length; 2435 2436 next = thisitem; 2437 do { 2438 next = nextitem(next); 2439 } while (wewant(next) && (nfrontp > next)); 2440 length = next-thisitem; 2441 memmove(good, thisitem, length); 2442 good += length; 2443 thisitem = next; 2444 } else { 2445 thisitem = nextitem(thisitem); 2446 } 2447 } 2448 2449 #endif /* 0 */ 2450 } 2451 2452 /* 2454 * These routines add various telnet commands to the data stream. 2455 */ 2456 2457 static void 2458 doflush(void) 2459 { 2460 NET2ADD(IAC, DO); 2461 NETADD(TELOPT_TM); 2462 flushline = 1; 2463 flushout = 1; 2464 (void) ttyflush(1); /* Flush/drop output */ 2465 /* do printoption AFTER flush, otherwise the output gets tossed... */ 2466 printoption("SENT", DO, TELOPT_TM); 2467 } 2468 2469 void 2470 xmitAO(void) 2471 { 2472 NET2ADD(IAC, AO); 2473 printoption("SENT", IAC, AO); 2474 if (autoflush) { 2475 doflush(); 2476 } 2477 } 2478 2479 2480 void 2481 xmitEL(void) 2482 { 2483 NET2ADD(IAC, EL); 2484 printoption("SENT", IAC, EL); 2485 } 2486 2487 void 2488 xmitEC(void) 2489 { 2490 NET2ADD(IAC, EC); 2491 printoption("SENT", IAC, EC); 2492 } 2493 2494 2495 int 2496 dosynch(char *s) 2497 { 2498 netclear(); /* clear the path to the network */ 2499 NETADD(IAC); 2500 setneturg(); 2501 NETADD(DM); 2502 printoption("SENT", IAC, DM); 2503 return 1; 2504 } 2505 2506 int want_status_response = 0; 2507 2508 int 2509 get_status(char *s) 2510 { 2511 unsigned char tmp[16]; 2512 unsigned char *cp; 2513 2514 if (my_want_state_is_dont(TELOPT_STATUS)) { 2515 printf("Remote side does not support STATUS option\n"); 2516 return 0; 2517 } 2518 cp = tmp; 2519 2520 *cp++ = IAC; 2521 *cp++ = SB; 2522 *cp++ = TELOPT_STATUS; 2523 *cp++ = TELQUAL_SEND; 2524 *cp++ = IAC; 2525 *cp++ = SE; 2526 if (NETROOM() >= cp - tmp) { 2527 ring_supply_data(&netoring, tmp, cp-tmp); 2528 printsub('>', tmp+2, cp - tmp - 2); 2529 } 2530 ++want_status_response; 2531 return 1; 2532 } 2533 2534 void 2535 intp(void) 2536 { 2537 NET2ADD(IAC, IP); 2538 printoption("SENT", IAC, IP); 2539 flushline = 1; 2540 if (autoflush) { 2541 doflush(); 2542 } 2543 if (autosynch) { 2544 dosynch(NULL); 2545 } 2546 } 2547 2548 void 2549 sendbrk(void) 2550 { 2551 NET2ADD(IAC, BREAK); 2552 printoption("SENT", IAC, BREAK); 2553 flushline = 1; 2554 if (autoflush) { 2555 doflush(); 2556 } 2557 if (autosynch) { 2558 dosynch(NULL); 2559 } 2560 } 2561 2562 void 2563 sendabort(void) 2564 { 2565 NET2ADD(IAC, ABORT); 2566 printoption("SENT", IAC, ABORT); 2567 flushline = 1; 2568 if (autoflush) { 2569 doflush(); 2570 } 2571 if (autosynch) { 2572 dosynch(NULL); 2573 } 2574 } 2575 2576 void 2577 sendsusp(void) 2578 { 2579 NET2ADD(IAC, SUSP); 2580 printoption("SENT", IAC, SUSP); 2581 flushline = 1; 2582 if (autoflush) { 2583 doflush(); 2584 } 2585 if (autosynch) { 2586 dosynch(NULL); 2587 } 2588 } 2589 2590 void 2591 sendeof(void) 2592 { 2593 NET2ADD(IAC, xEOF); 2594 printoption("SENT", IAC, xEOF); 2595 } 2596 2597 void 2598 sendayt(void) 2599 { 2600 NET2ADD(IAC, AYT); 2601 printoption("SENT", IAC, AYT); 2602 } 2603 2604 /* 2605 * Send a window size update to the remote system. 2606 */ 2607 2608 void 2609 sendnaws(void) 2610 { 2611 long rows, cols; 2612 unsigned char tmp[16]; 2613 unsigned char *cp; 2614 2615 if (my_state_is_wont(TELOPT_NAWS)) 2616 return; 2617 2618 #define PUTSHORT(cp, x) { if ((*cp++ = ((x)>>8)&0xff) == IAC) *cp++ = IAC; \ 2619 if ((*cp++ = ((x))&0xff) == IAC) *cp++ = IAC; } 2620 2621 if (TerminalWindowSize(&rows, &cols) == 0) { /* Failed */ 2622 return; 2623 } 2624 2625 cp = tmp; 2626 2627 *cp++ = IAC; 2628 *cp++ = SB; 2629 *cp++ = TELOPT_NAWS; 2630 PUTSHORT(cp, cols); 2631 PUTSHORT(cp, rows); 2632 *cp++ = IAC; 2633 *cp++ = SE; 2634 if (NETROOM() >= cp - tmp) { 2635 ring_supply_data(&netoring, tmp, cp-tmp); 2636 printsub('>', tmp+2, cp - tmp - 2); 2637 } 2638 } 2639 2640 void 2641 tel_enter_binary(int rw) 2642 { 2643 if (rw&1) 2644 send_do(TELOPT_BINARY, 1); 2645 if (rw&2) 2646 send_will(TELOPT_BINARY, 1); 2647 } 2648 2649 void 2650 tel_leave_binary(int rw) 2651 { 2652 if (rw&1) 2653 send_dont(TELOPT_BINARY, 1); 2654 if (rw&2) 2655 send_wont(TELOPT_BINARY, 1); 2656 } 2657
Indexes created Sat Oct 25 16:10:12 GMT 2025