telnet.c revision 1.26
1 /* $NetBSD: telnet.c,v 1.26 2003/08/07 11:16:11 agc 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 1.26 2003/08/07 11:16:11 agc 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 jmp_buf peerdied; 152 153 int flushline; 154 int linemode; 155 156 #ifdef KLUDGELINEMODE 157 int kludgelinemode = 1; 158 #endif 159 160 static void dooption(int); 161 static void dontoption(int); 162 static void suboption(void); 163 static int telsnd(void); 164 static void netclear(void); 165 static void doflush(void); 166 167 /* 168 * The following are some clocks used to decide how to interpret 169 * the relationship between various variables. 170 */ 171 172 Clocks clocks; 173 174 #ifdef notdef 176 Modelist modelist[] = { 177 { "telnet command mode", COMMAND_LINE }, 178 { "character-at-a-time mode", 0 }, 179 { "character-at-a-time mode (local echo)", LOCAL_ECHO|LOCAL_CHARS }, 180 { "line-by-line mode (remote echo)", LINE | LOCAL_CHARS }, 181 { "line-by-line mode", LINE | LOCAL_ECHO | LOCAL_CHARS }, 182 { "line-by-line mode (local echoing suppressed)", LINE | LOCAL_CHARS }, 183 { "3270 mode", 0 }, 184 }; 185 #endif 186 187 188 /* 190 * Initialize telnet environment. 191 */ 192 193 void 194 init_telnet(void) 195 { 196 env_init(); 197 198 SB_CLEAR(); 199 ClearArray(options); 200 201 connected = In3270 = ISend = localflow = donebinarytoggle = 0; 202 #if defined(AUTHENTICATION) || defined(ENCRYPTION) 203 auth_encrypt_connect(connected); 204 #endif /* defined(AUTHENTICATION) || defined(ENCRYPTION) */ 205 restartany = -1; 206 207 SYNCHing = 0; 208 209 /* Don't change NetTrace */ 210 211 escape = CONTROL(']'); 212 rlogin = _POSIX_VDISABLE; 213 #ifdef KLUDGELINEMODE 214 echoc = CONTROL('E'); 215 #endif 216 217 flushline = 1; 218 telrcv_state = TS_DATA; 219 } 220 221 223 #ifdef notdef 224 #include <stdarg.h> 225 226 /*VARARGS*/ 227 static void 228 printring(Ring *ring, char *format, ...) 229 va_dcl 230 { 231 va_list ap; 232 char buffer[100]; /* where things go */ 233 char *ptr; 234 char *string; 235 int i; 236 237 va_start(ap, format); 238 239 ptr = buffer; 240 241 while ((i = *format++) != 0) { 242 if (i == '%') { 243 i = *format++; 244 switch (i) { 245 case 'c': 246 *ptr++ = va_arg(ap, int); 247 break; 248 case 's': 249 string = va_arg(ap, char *); 250 ring_supply_data(ring, buffer, ptr-buffer); 251 ring_supply_data(ring, string, strlen(string)); 252 ptr = buffer; 253 break; 254 case 0: 255 ExitString("printring: trailing %%.\n", 1); 256 /*NOTREACHED*/ 257 default: 258 ExitString("printring: unknown format character.\n", 1); 259 /*NOTREACHED*/ 260 } 261 } else { 262 *ptr++ = i; 263 } 264 } 265 va_end(ap); 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(int c, int init) 280 { 281 if (init) { 282 if (((do_dont_resp[c] == 0) && my_state_is_do(c)) || 283 my_want_state_is_do(c)) 284 return; 285 set_my_want_state_do(c); 286 do_dont_resp[c]++; 287 } 288 NET2ADD(IAC, DO); 289 NETADD(c); 290 printoption("SENT", DO, c); 291 } 292 293 void 294 send_dont(int c, int init) 295 { 296 if (init) { 297 if (((do_dont_resp[c] == 0) && my_state_is_dont(c)) || 298 my_want_state_is_dont(c)) 299 return; 300 set_my_want_state_dont(c); 301 do_dont_resp[c]++; 302 } 303 NET2ADD(IAC, DONT); 304 NETADD(c); 305 printoption("SENT", DONT, c); 306 } 307 308 void 309 send_will(int c, int init) 310 { 311 if (init) { 312 if (((will_wont_resp[c] == 0) && my_state_is_will(c)) || 313 my_want_state_is_will(c)) 314 return; 315 set_my_want_state_will(c); 316 will_wont_resp[c]++; 317 } 318 NET2ADD(IAC, WILL); 319 NETADD(c); 320 printoption("SENT", WILL, c); 321 } 322 323 void 324 send_wont(int c, int init) 325 { 326 if (init) { 327 if (((will_wont_resp[c] == 0) && my_state_is_wont(c)) || 328 my_want_state_is_wont(c)) 329 return; 330 set_my_want_state_wont(c); 331 will_wont_resp[c]++; 332 } 333 NET2ADD(IAC, WONT); 334 NETADD(c); 335 printoption("SENT", WONT, c); 336 } 337 338 339 void 340 willoption(int option) 341 { 342 int new_state_ok = 0; 343 344 if (do_dont_resp[option]) { 345 --do_dont_resp[option]; 346 if (do_dont_resp[option] && my_state_is_do(option)) 347 --do_dont_resp[option]; 348 } 349 350 if ((do_dont_resp[option] == 0) && my_want_state_is_dont(option)) { 351 352 switch (option) { 353 354 case TELOPT_ECHO: 355 # if defined(TN3270) 356 /* 357 * The following is a pain in the rear-end. 358 * Various IBM servers (some versions of Wiscnet, 359 * possibly Fibronics/Spartacus, and who knows who 360 * else) will NOT allow us to send "DO SGA" too early 361 * in the setup proceedings. On the other hand, 362 * 4.2 servers (telnetd) won't set SGA correctly. 363 * So, we are stuck. Empirically (but, based on 364 * a VERY small sample), the IBM servers don't send 365 * out anything about ECHO, so we postpone our sending 366 * "DO SGA" until we see "WILL ECHO" (which 4.2 servers 367 * DO send). 368 */ 369 { 370 if (askedSGA == 0) { 371 askedSGA = 1; 372 if (my_want_state_is_dont(TELOPT_SGA)) 373 send_do(TELOPT_SGA, 1); 374 } 375 } 376 /* Fall through */ 377 case TELOPT_EOR: 378 #endif /* defined(TN3270) */ 379 case TELOPT_BINARY: 380 case TELOPT_SGA: 381 settimer(modenegotiated); 382 /* FALL THROUGH */ 383 case TELOPT_STATUS: 384 #ifdef AUTHENTICATION 385 case TELOPT_AUTHENTICATION: 386 #ifdef ENCRYPTION 387 case TELOPT_ENCRYPT: 388 #endif /* ENCRYPTION */ 389 #endif 390 new_state_ok = 1; 391 break; 392 393 case TELOPT_TM: 394 if (flushout) 395 flushout = 0; 396 /* 397 * Special case for TM. If we get back a WILL, 398 * pretend we got back a WONT. 399 */ 400 set_my_want_state_dont(option); 401 set_my_state_dont(option); 402 return; /* Never reply to TM will's/wont's */ 403 404 case TELOPT_LINEMODE: 405 default: 406 break; 407 } 408 409 if (new_state_ok) { 410 set_my_want_state_do(option); 411 send_do(option, 0); 412 setconnmode(0); /* possibly set new tty mode */ 413 } else { 414 do_dont_resp[option]++; 415 send_dont(option, 0); 416 } 417 } 418 set_my_state_do(option); 419 #ifdef ENCRYPTION 420 if (option == TELOPT_ENCRYPT) 421 encrypt_send_support(); 422 #endif /* ENCRYPTION */ 423 } 424 425 void 426 wontoption(int option) 427 { 428 if (do_dont_resp[option]) { 429 --do_dont_resp[option]; 430 if (do_dont_resp[option] && my_state_is_dont(option)) 431 --do_dont_resp[option]; 432 } 433 434 if ((do_dont_resp[option] == 0) && my_want_state_is_do(option)) { 435 436 switch (option) { 437 438 #ifdef KLUDGELINEMODE 439 case TELOPT_SGA: 440 if (!kludgelinemode) 441 break; 442 /* FALL THROUGH */ 443 #endif 444 case TELOPT_ECHO: 445 settimer(modenegotiated); 446 break; 447 448 case TELOPT_TM: 449 if (flushout) 450 flushout = 0; 451 set_my_want_state_dont(option); 452 set_my_state_dont(option); 453 return; /* Never reply to TM will's/wont's */ 454 455 default: 456 break; 457 } 458 set_my_want_state_dont(option); 459 if (my_state_is_do(option)) 460 send_dont(option, 0); 461 setconnmode(0); /* Set new tty mode */ 462 } else if (option == TELOPT_TM) { 463 /* 464 * Special case for TM. 465 */ 466 if (flushout) 467 flushout = 0; 468 set_my_want_state_dont(option); 469 } 470 set_my_state_dont(option); 471 } 472 473 static void 474 dooption(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 #ifdef ENCRYPTION 509 case TELOPT_ENCRYPT: /* encryption variable option */ 510 #endif /* ENCRYPTION */ 511 new_state_ok = 1; 512 break; 513 514 case TELOPT_NEW_ENVIRON: /* New environment variable option */ 515 #ifdef OLD_ENVIRON 516 if (my_state_is_will(TELOPT_OLD_ENVIRON)) 517 send_wont(TELOPT_OLD_ENVIRON, 1); /* turn off the old */ 518 goto env_common; 519 case TELOPT_OLD_ENVIRON: /* Old environment variable option */ 520 if (my_state_is_will(TELOPT_NEW_ENVIRON)) 521 break; /* Don't enable if new one is in use! */ 522 env_common: 523 telopt_environ = option; 524 #endif 525 new_state_ok = 1; 526 break; 527 528 #ifdef AUTHENTICATION 529 case TELOPT_AUTHENTICATION: 530 if (autologin) 531 new_state_ok = 1; 532 break; 533 #endif 534 535 case TELOPT_XDISPLOC: /* X Display location */ 536 if (env_getvalue((unsigned char *)"DISPLAY")) 537 new_state_ok = 1; 538 break; 539 540 case TELOPT_LINEMODE: 541 #ifdef KLUDGELINEMODE 542 kludgelinemode = 0; 543 send_do(TELOPT_SGA, 1); 544 #endif 545 set_my_want_state_will(TELOPT_LINEMODE); 546 send_will(option, 0); 547 set_my_state_will(TELOPT_LINEMODE); 548 slc_init(); 549 return; 550 551 case TELOPT_ECHO: /* We're never going to echo... */ 552 default: 553 break; 554 } 555 556 if (new_state_ok) { 557 set_my_want_state_will(option); 558 send_will(option, 0); 559 setconnmode(0); /* Set new tty mode */ 560 } else { 561 will_wont_resp[option]++; 562 send_wont(option, 0); 563 } 564 } else { 565 /* 566 * Handle options that need more things done after the 567 * other side has acknowledged the option. 568 */ 569 switch (option) { 570 case TELOPT_LINEMODE: 571 #ifdef KLUDGELINEMODE 572 kludgelinemode = 0; 573 send_do(TELOPT_SGA, 1); 574 #endif 575 set_my_state_will(option); 576 slc_init(); 577 send_do(TELOPT_SGA, 0); 578 return; 579 } 580 } 581 } 582 set_my_state_will(option); 583 } 584 585 static void 586 dontoption(int option) 587 { 588 589 if (will_wont_resp[option]) { 590 --will_wont_resp[option]; 591 if (will_wont_resp[option] && my_state_is_wont(option)) 592 --will_wont_resp[option]; 593 } 594 595 if ((will_wont_resp[option] == 0) && my_want_state_is_will(option)) { 596 switch (option) { 597 case TELOPT_LINEMODE: 598 linemode = 0; /* put us back to the default state */ 599 break; 600 #ifdef OLD_ENVIRON 601 case TELOPT_NEW_ENVIRON: 602 /* 603 * The new environ option wasn't recognized, try 604 * the old one. 605 */ 606 send_will(TELOPT_OLD_ENVIRON, 1); 607 telopt_environ = TELOPT_OLD_ENVIRON; 608 break; 609 #endif 610 } 611 /* we always accept a DONT */ 612 set_my_want_state_wont(option); 613 if (my_state_is_will(option)) 614 send_wont(option, 0); 615 setconnmode(0); /* Set new tty mode */ 616 } 617 set_my_state_wont(option); 618 } 619 620 /* 621 * Given a buffer returned by tgetent(), this routine will turn 622 * the pipe separated list of names in the buffer into an array 623 * of pointers to null terminated names. We toss out any bad, 624 * duplicate, or verbose names (names with spaces). 625 */ 626 627 static char *name_unknown = "UNKNOWN"; 628 static char *unknown[] = { 0, 0 }; 629 630 char ** 631 mklist(char *buf, char *name) 632 { 633 int n; 634 char c, *cp, **argvp, *cp2, **argv, **avt; 635 636 if (name) { 637 if ((int)strlen(name) > 40) { 638 name = 0; 639 unknown[0] = name_unknown; 640 } else { 641 unknown[0] = name; 642 upcase(name); 643 } 644 } else 645 unknown[0] = name_unknown; 646 /* 647 * Count up the number of names. 648 */ 649 for (n = 1, cp = buf; *cp && *cp != ':'; cp++) { 650 if (*cp == '|') 651 n++; 652 } 653 /* 654 * Allocate an array to put the name pointers into 655 */ 656 argv = (char **)malloc((n+3)*sizeof(char *)); 657 if (argv == 0) 658 return(unknown); 659 660 /* 661 * Fill up the array of pointers to names. 662 */ 663 *argv = 0; 664 argvp = argv+1; 665 n = 0; 666 for (cp = cp2 = buf; (c = *cp); cp++) { 667 if (c == '|' || c == ':') { 668 *cp++ = '\0'; 669 /* 670 * Skip entries that have spaces or are over 40 671 * characters long. If this is our environment 672 * name, then put it up front. Otherwise, as 673 * long as this is not a duplicate name (case 674 * insensitive) add it to the list. 675 */ 676 if (n || (cp - cp2 > 41)) 677 ; 678 else if (name && (strncasecmp(name, cp2, cp-cp2) == 0)) 679 *argv = cp2; 680 else if (is_unique(cp2, argv+1, argvp)) 681 *argvp++ = cp2; 682 if (c == ':') 683 break; 684 /* 685 * Skip multiple delimiters. Reset cp2 to 686 * the beginning of the next name. Reset n, 687 * the flag for names with spaces. 688 */ 689 while ((c = *cp) == '|') 690 cp++; 691 cp2 = cp; 692 n = 0; 693 } 694 /* 695 * Skip entries with spaces or non-ascii values. 696 * Convert lower case letters to upper case. 697 */ 698 if ((c == ' ') || !isascii(c)) 699 n = 1; 700 else if (islower((unsigned char)c)) 701 *cp = toupper(c); 702 } 703 704 /* 705 * Check for an old V6 2 character name. If the second 706 * name points to the beginning of the buffer, and is 707 * only 2 characters long, move it to the end of the array. 708 */ 709 if ((argv[1] == buf) && (strlen(argv[1]) == 2)) { 710 --argvp; 711 for (avt = &argv[1]; avt < argvp; avt++) 712 *avt = *(avt+1); 713 *argvp++ = buf; 714 } 715 716 /* 717 * Duplicate last name, for TTYPE option, and null 718 * terminate the array. If we didn't find a match on 719 * our terminal name, put that name at the beginning. 720 */ 721 cp = *(argvp-1); 722 *argvp++ = cp; 723 *argvp = 0; 724 725 if (*argv == 0) { 726 if (name) 727 *argv = name; 728 else { 729 --argvp; 730 for (avt = argv; avt < argvp; avt++) 731 *avt = *(avt+1); 732 } 733 } 734 if (*argv) 735 return(argv); 736 else 737 return(unknown); 738 } 739 740 int 741 is_unique(char *name, char **as, char **ae) 742 { 743 char **ap; 744 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; 755 756 /*ARGSUSED*/ 757 int 758 setup_term(char *tname, int fd, int *errp) 759 { 760 char zz[1024], *zz_ptr; 761 char *ext_tc, *newptr; 762 763 if ((termbuf = (char *) malloc(1024)) == NULL) 764 goto error; 765 766 if (tgetent(termbuf, tname) == 1) { 767 /* check for ZZ capability, which indicates termcap truncated */ 768 zz_ptr = zz; 769 if (tgetstr("ZZ", &zz_ptr) != NULL) { 770 /* it was, fish back the full termcap */ 771 sscanf(zz, "%p", &ext_tc); 772 if ((newptr = (char *) realloc(termbuf, 773 strlen(ext_tc) + 1)) 774 == NULL) { 775 goto error; 776 } 777 778 strlcpy(newptr, ext_tc, strlen(ext_tc) + 1); 779 termbuf = newptr; 780 } 781 782 if (errp) 783 *errp = 1; 784 return(0); 785 } 786 error: 787 if (errp) 788 *errp = 0; 789 return(-1); 790 } 791 #else 792 #define termbuf ttytype 793 extern char ttytype[]; 794 #endif 795 796 int resettermname = 1; 797 798 char * 799 gettermname(void) 800 { 801 char *tname; 802 static char **tnamep = 0; 803 static char **next; 804 int err; 805 806 if (resettermname) { 807 resettermname = 0; 808 if (tnamep && tnamep != unknown) 809 free(tnamep); 810 if ((tname = (char *)env_getvalue((unsigned char *)"TERM")) && 811 (setup_term(tname, 1, &err) == 0)) { 812 tnamep = mklist(termbuf, tname); 813 } else { 814 if (tname && ((int)strlen(tname) <= 40)) { 815 unknown[0] = tname; 816 upcase(tname); 817 } else 818 unknown[0] = name_unknown; 819 tnamep = unknown; 820 } 821 next = tnamep; 822 } 823 if (*next == 0) 824 next = tnamep; 825 return(*next++); 826 } 827 /* 828 * suboption() 829 * 830 * Look at the sub-option buffer, and try to be helpful to the other 831 * side. 832 * 833 * Currently we recognize: 834 * 835 * Terminal type, send request. 836 * Terminal speed (send request). 837 * Local flow control (is request). 838 * Linemode 839 */ 840 841 static void 842 suboption(void) 843 { 844 unsigned char subchar; 845 846 printsub('<', subbuffer, SB_LEN()+2); 847 switch (subchar = SB_GET()) { 848 case TELOPT_TTYPE: 849 if (my_want_state_is_wont(TELOPT_TTYPE)) 850 return; 851 if (SB_EOF() || SB_GET() != TELQUAL_SEND) { 852 return; 853 } else { 854 char *name; 855 unsigned char temp[50]; 856 int len; 857 858 #ifdef TN3270 859 if (tn3270_ttype()) { 860 return; 861 } 862 #endif /* defined(TN3270) */ 863 name = gettermname(); 864 len = strlen(name) + 4 + 2; 865 if (len < NETROOM()) { 866 sprintf((char *)temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE, 867 TELQUAL_IS, name, IAC, SE); 868 ring_supply_data(&netoring, temp, len); 869 printsub('>', &temp[2], len-2); 870 } else { 871 ExitString("No room in buffer for terminal type.\n", 1); 872 /*NOTREACHED*/ 873 } 874 } 875 break; 876 case TELOPT_TSPEED: 877 if (my_want_state_is_wont(TELOPT_TSPEED)) 878 return; 879 if (SB_EOF()) 880 return; 881 if (SB_GET() == TELQUAL_SEND) { 882 long ospeed, ispeed; 883 unsigned char temp[50]; 884 int len; 885 886 TerminalSpeeds(&ispeed, &ospeed); 887 888 sprintf((char *)temp, "%c%c%c%c%ld,%ld%c%c", IAC, SB, TELOPT_TSPEED, 889 TELQUAL_IS, (long)ospeed, (long)ispeed, IAC, SE); 890 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 891 892 if (len < NETROOM()) { 893 ring_supply_data(&netoring, temp, len); 894 printsub('>', temp+2, len - 2); 895 } 896 /*@*/ else printf("lm_will: not enough room in buffer\n"); 897 } 898 break; 899 case TELOPT_LFLOW: 900 if (my_want_state_is_wont(TELOPT_LFLOW)) 901 return; 902 if (SB_EOF()) 903 return; 904 switch(SB_GET()) { 905 case LFLOW_RESTART_ANY: 906 restartany = 1; 907 break; 908 case LFLOW_RESTART_XON: 909 restartany = 0; 910 break; 911 case LFLOW_ON: 912 localflow = 1; 913 break; 914 case LFLOW_OFF: 915 localflow = 0; 916 break; 917 default: 918 return; 919 } 920 setcommandmode(); 921 setconnmode(0); 922 break; 923 924 case TELOPT_LINEMODE: 925 if (my_want_state_is_wont(TELOPT_LINEMODE)) 926 return; 927 if (SB_EOF()) 928 return; 929 switch (SB_GET()) { 930 case WILL: 931 lm_will(subpointer, SB_LEN()); 932 break; 933 case WONT: 934 lm_wont(subpointer, SB_LEN()); 935 break; 936 case DO: 937 lm_do(subpointer, SB_LEN()); 938 break; 939 case DONT: 940 lm_dont(subpointer, SB_LEN()); 941 break; 942 case LM_SLC: 943 slc(subpointer, SB_LEN()); 944 break; 945 case LM_MODE: 946 lm_mode(subpointer, SB_LEN(), 0); 947 break; 948 default: 949 break; 950 } 951 break; 952 953 #ifdef OLD_ENVIRON 954 case TELOPT_OLD_ENVIRON: 955 #endif 956 case TELOPT_NEW_ENVIRON: 957 if (SB_EOF()) 958 return; 959 switch(SB_PEEK()) { 960 case TELQUAL_IS: 961 case TELQUAL_INFO: 962 if (my_want_state_is_dont(subchar)) 963 return; 964 break; 965 case TELQUAL_SEND: 966 if (my_want_state_is_wont(subchar)) { 967 return; 968 } 969 break; 970 default: 971 return; 972 } 973 env_opt(subpointer, SB_LEN()); 974 break; 975 976 case TELOPT_XDISPLOC: 977 if (my_want_state_is_wont(TELOPT_XDISPLOC)) 978 return; 979 if (SB_EOF()) 980 return; 981 if (SB_GET() == TELQUAL_SEND) { 982 unsigned char temp[50], *dp; 983 int len; 984 985 if ((dp = env_getvalue((unsigned char *)"DISPLAY")) == NULL) { 986 /* 987 * Something happened, we no longer have a DISPLAY 988 * variable. So, turn off the option. 989 */ 990 send_wont(TELOPT_XDISPLOC, 1); 991 break; 992 } 993 sprintf((char *)temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_XDISPLOC, 994 TELQUAL_IS, dp, IAC, SE); 995 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 996 997 if (len < NETROOM()) { 998 ring_supply_data(&netoring, temp, len); 999 printsub('>', temp+2, len - 2); 1000 } 1001 /*@*/ else printf("lm_will: not enough room in buffer\n"); 1002 } 1003 break; 1004 1005 #ifdef AUTHENTICATION 1006 case TELOPT_AUTHENTICATION: { 1007 if (!autologin) 1008 break; 1009 if (SB_EOF()) 1010 return; 1011 switch(SB_GET()) { 1012 case TELQUAL_IS: 1013 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 1014 return; 1015 auth_is(subpointer, SB_LEN()); 1016 break; 1017 case TELQUAL_SEND: 1018 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 1019 return; 1020 auth_send(subpointer, SB_LEN()); 1021 break; 1022 case TELQUAL_REPLY: 1023 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 1024 return; 1025 auth_reply(subpointer, SB_LEN()); 1026 break; 1027 case TELQUAL_NAME: 1028 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 1029 return; 1030 auth_name(subpointer, SB_LEN()); 1031 break; 1032 } 1033 } 1034 break; 1035 #endif 1036 #ifdef ENCRYPTION 1037 case TELOPT_ENCRYPT: 1038 if (SB_EOF()) 1039 return; 1040 switch(SB_GET()) { 1041 case ENCRYPT_START: 1042 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 1043 return; 1044 encrypt_start(subpointer, SB_LEN()); 1045 break; 1046 case ENCRYPT_END: 1047 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 1048 return; 1049 encrypt_end(); 1050 break; 1051 case ENCRYPT_SUPPORT: 1052 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1053 return; 1054 encrypt_support(subpointer, SB_LEN()); 1055 break; 1056 case ENCRYPT_REQSTART: 1057 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1058 return; 1059 encrypt_request_start(subpointer, SB_LEN()); 1060 break; 1061 case ENCRYPT_REQEND: 1062 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1063 return; 1064 /* 1065 * We can always send an REQEND so that we cannot 1066 * get stuck encrypting. We should only get this 1067 * if we have been able to get in the correct mode 1068 * anyhow. 1069 */ 1070 encrypt_request_end(); 1071 break; 1072 case ENCRYPT_IS: 1073 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 1074 return; 1075 encrypt_is(subpointer, SB_LEN()); 1076 break; 1077 case ENCRYPT_REPLY: 1078 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1079 return; 1080 encrypt_reply(subpointer, SB_LEN()); 1081 break; 1082 case ENCRYPT_ENC_KEYID: 1083 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 1084 return; 1085 encrypt_enc_keyid(subpointer, SB_LEN()); 1086 break; 1087 case ENCRYPT_DEC_KEYID: 1088 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1089 return; 1090 encrypt_dec_keyid(subpointer, SB_LEN()); 1091 break; 1092 default: 1093 break; 1094 } 1095 break; 1096 #endif /* ENCRYPTION */ 1097 default: 1098 break; 1099 } 1100 } 1101 1102 static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE }; 1103 1104 void 1105 lm_will(unsigned char *cmd, int len) 1106 { 1107 if (len < 1) { 1108 /*@*/ printf("lm_will: no command!!!\n"); /* Should not happen... */ 1109 return; 1110 } 1111 switch(cmd[0]) { 1112 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 1113 default: 1114 str_lm[3] = DONT; 1115 str_lm[4] = cmd[0]; 1116 if (NETROOM() > sizeof(str_lm)) { 1117 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 1118 printsub('>', &str_lm[2], sizeof(str_lm)-2); 1119 } 1120 /*@*/ else printf("lm_will: not enough room in buffer\n"); 1121 break; 1122 } 1123 } 1124 1125 void 1126 lm_wont(unsigned char *cmd, int len) 1127 { 1128 if (len < 1) { 1129 /*@*/ printf("lm_wont: no command!!!\n"); /* Should not happen... */ 1130 return; 1131 } 1132 switch(cmd[0]) { 1133 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 1134 default: 1135 /* We are always DONT, so don't respond */ 1136 return; 1137 } 1138 } 1139 1140 void 1141 lm_do(unsigned char *cmd, int len) 1142 { 1143 if (len < 1) { 1144 /*@*/ printf("lm_do: no command!!!\n"); /* Should not happen... */ 1145 return; 1146 } 1147 switch(cmd[0]) { 1148 case LM_FORWARDMASK: 1149 default: 1150 str_lm[3] = WONT; 1151 str_lm[4] = cmd[0]; 1152 if (NETROOM() > sizeof(str_lm)) { 1153 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 1154 printsub('>', &str_lm[2], sizeof(str_lm)-2); 1155 } 1156 /*@*/ else printf("lm_do: not enough room in buffer\n"); 1157 break; 1158 } 1159 } 1160 1161 void 1162 lm_dont(unsigned char *cmd, int len) 1163 { 1164 if (len < 1) { 1165 /*@*/ printf("lm_dont: no command!!!\n"); /* Should not happen... */ 1166 return; 1167 } 1168 switch(cmd[0]) { 1169 case LM_FORWARDMASK: 1170 default: 1171 /* we are always WONT, so don't respond */ 1172 break; 1173 } 1174 } 1175 1176 static unsigned char str_lm_mode[] = { 1177 IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE 1178 }; 1179 1180 void 1181 lm_mode(unsigned char *cmd, int len, int init) 1182 { 1183 if (len != 1) 1184 return; 1185 if ((linemode&MODE_MASK&~MODE_ACK) == *cmd) 1186 return; 1187 if (*cmd&MODE_ACK) 1188 return; 1189 linemode = *cmd&(MODE_MASK&~MODE_ACK); 1190 str_lm_mode[4] = linemode; 1191 if (!init) 1192 str_lm_mode[4] |= MODE_ACK; 1193 if (NETROOM() > sizeof(str_lm_mode)) { 1194 ring_supply_data(&netoring, str_lm_mode, sizeof(str_lm_mode)); 1195 printsub('>', &str_lm_mode[2], sizeof(str_lm_mode)-2); 1196 } 1197 /*@*/ else printf("lm_mode: not enough room in buffer\n"); 1198 setconnmode(0); /* set changed mode */ 1199 } 1200 1201 1202 1204 /* 1205 * slc() 1206 * Handle special character suboption of LINEMODE. 1207 */ 1208 1209 struct spc { 1210 cc_t val; 1211 cc_t *valp; 1212 char flags; /* Current flags & level */ 1213 char mylevel; /* Maximum level & flags */ 1214 } spc_data[NSLC+1]; 1215 1216 #define SLC_IMPORT 0 1217 #define SLC_EXPORT 1 1218 #define SLC_RVALUE 2 1219 static int slc_mode = SLC_EXPORT; 1220 1221 void 1222 slc_init(void) 1223 { 1224 struct spc *spcp; 1225 1226 localchars = 1; 1227 for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) { 1228 spcp->val = 0; 1229 spcp->valp = 0; 1230 spcp->flags = spcp->mylevel = SLC_NOSUPPORT; 1231 } 1232 1233 #define initfunc(func, flags) { \ 1234 spcp = &spc_data[func]; \ 1235 if ((spcp->valp = tcval(func)) != NULL){ \ 1236 spcp->val = *spcp->valp; \ 1237 spcp->mylevel = SLC_VARIABLE|flags; \ 1238 } else { \ 1239 spcp->val = 0; \ 1240 spcp->mylevel = SLC_DEFAULT; \ 1241 } \ 1242 } 1243 1244 initfunc(SLC_SYNCH, 0); 1245 /* No BRK */ 1246 initfunc(SLC_AO, 0); 1247 initfunc(SLC_AYT, 0); 1248 /* No EOR */ 1249 initfunc(SLC_ABORT, SLC_FLUSHIN|SLC_FLUSHOUT); 1250 initfunc(SLC_EOF, 0); 1251 initfunc(SLC_SUSP, SLC_FLUSHIN); 1252 initfunc(SLC_EC, 0); 1253 initfunc(SLC_EL, 0); 1254 initfunc(SLC_EW, 0); 1255 initfunc(SLC_RP, 0); 1256 initfunc(SLC_LNEXT, 0); 1257 initfunc(SLC_XON, 0); 1258 initfunc(SLC_XOFF, 0); 1259 initfunc(SLC_FORW1, 0); 1260 initfunc(SLC_FORW2, 0); 1261 /* No FORW2 */ 1262 1263 initfunc(SLC_IP, SLC_FLUSHIN|SLC_FLUSHOUT); 1264 #undef initfunc 1265 1266 if (slc_mode == SLC_EXPORT) 1267 slc_export(); 1268 else 1269 slc_import(1); 1270 1271 } 1272 1273 void 1274 slcstate(void) 1275 { 1276 printf("Special characters are %s values\n", 1277 slc_mode == SLC_IMPORT ? "remote default" : 1278 slc_mode == SLC_EXPORT ? "local" : 1279 "remote"); 1280 } 1281 1282 void 1283 slc_mode_export(int n) 1284 { 1285 slc_mode = SLC_EXPORT; 1286 if (my_state_is_will(TELOPT_LINEMODE)) 1287 slc_export(); 1288 } 1289 1290 void 1291 slc_mode_import(int def) 1292 { 1293 slc_mode = def ? SLC_IMPORT : SLC_RVALUE; 1294 if (my_state_is_will(TELOPT_LINEMODE)) 1295 slc_import(def); 1296 } 1297 1298 unsigned char slc_import_val[] = { 1299 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE 1300 }; 1301 unsigned char slc_import_def[] = { 1302 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE 1303 }; 1304 1305 void 1306 slc_import(int def) 1307 { 1308 if (NETROOM() > sizeof(slc_import_val)) { 1309 if (def) { 1310 ring_supply_data(&netoring, slc_import_def, sizeof(slc_import_def)); 1311 printsub('>', &slc_import_def[2], sizeof(slc_import_def)-2); 1312 } else { 1313 ring_supply_data(&netoring, slc_import_val, sizeof(slc_import_val)); 1314 printsub('>', &slc_import_val[2], sizeof(slc_import_val)-2); 1315 } 1316 } 1317 /*@*/ else printf("slc_import: not enough room\n"); 1318 } 1319 1320 void 1321 slc_export(void) 1322 { 1323 struct spc *spcp; 1324 1325 TerminalDefaultChars(); 1326 1327 slc_start_reply(); 1328 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1329 if (spcp->mylevel != SLC_NOSUPPORT) { 1330 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1331 spcp->flags = SLC_NOSUPPORT; 1332 else 1333 spcp->flags = spcp->mylevel; 1334 if (spcp->valp) 1335 spcp->val = *spcp->valp; 1336 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1337 } 1338 } 1339 slc_end_reply(); 1340 (void)slc_update(); 1341 setconnmode(1); /* Make sure the character values are set */ 1342 } 1343 1344 void 1345 slc(unsigned char *cp, int len) 1346 { 1347 struct spc *spcp; 1348 int func,level; 1349 1350 slc_start_reply(); 1351 1352 for (; len >= 3; len -=3, cp +=3) { 1353 1354 func = cp[SLC_FUNC]; 1355 1356 if (func == 0) { 1357 /* 1358 * Client side: always ignore 0 function. 1359 */ 1360 continue; 1361 } 1362 if (func > NSLC) { 1363 if ((cp[SLC_FLAGS] & SLC_LEVELBITS) != SLC_NOSUPPORT) 1364 slc_add_reply(func, SLC_NOSUPPORT, 0); 1365 continue; 1366 } 1367 1368 spcp = &spc_data[func]; 1369 1370 level = cp[SLC_FLAGS]&(SLC_LEVELBITS|SLC_ACK); 1371 1372 if ((cp[SLC_VALUE] == (unsigned char)spcp->val) && 1373 ((level&SLC_LEVELBITS) == (spcp->flags&SLC_LEVELBITS))) { 1374 continue; 1375 } 1376 1377 if (level == (SLC_DEFAULT|SLC_ACK)) { 1378 /* 1379 * This is an error condition, the SLC_ACK 1380 * bit should never be set for the SLC_DEFAULT 1381 * level. Our best guess to recover is to 1382 * ignore the SLC_ACK bit. 1383 */ 1384 cp[SLC_FLAGS] &= ~SLC_ACK; 1385 } 1386 1387 if (level == ((spcp->flags&SLC_LEVELBITS)|SLC_ACK)) { 1388 spcp->val = (cc_t)cp[SLC_VALUE]; 1389 spcp->flags = cp[SLC_FLAGS]; /* include SLC_ACK */ 1390 continue; 1391 } 1392 1393 level &= ~SLC_ACK; 1394 1395 if (level <= (spcp->mylevel&SLC_LEVELBITS)) { 1396 spcp->flags = cp[SLC_FLAGS]|SLC_ACK; 1397 spcp->val = (cc_t)cp[SLC_VALUE]; 1398 } 1399 if (level == SLC_DEFAULT) { 1400 if ((spcp->mylevel&SLC_LEVELBITS) != SLC_DEFAULT) 1401 spcp->flags = spcp->mylevel; 1402 else 1403 spcp->flags = SLC_NOSUPPORT; 1404 } 1405 slc_add_reply(func, spcp->flags, spcp->val); 1406 } 1407 slc_end_reply(); 1408 if (slc_update()) 1409 setconnmode(1); /* set the new character values */ 1410 } 1411 1412 void 1413 slc_check(void) 1414 { 1415 struct spc *spcp; 1416 1417 slc_start_reply(); 1418 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1419 if (spcp->valp && spcp->val != *spcp->valp) { 1420 spcp->val = *spcp->valp; 1421 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1422 spcp->flags = SLC_NOSUPPORT; 1423 else 1424 spcp->flags = spcp->mylevel; 1425 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1426 } 1427 } 1428 slc_end_reply(); 1429 setconnmode(1); 1430 } 1431 1432 1433 unsigned char slc_reply[128]; 1434 unsigned char *slc_replyp; 1435 1436 void 1437 slc_start_reply(void) 1438 { 1439 slc_replyp = slc_reply; 1440 *slc_replyp++ = IAC; 1441 *slc_replyp++ = SB; 1442 *slc_replyp++ = TELOPT_LINEMODE; 1443 *slc_replyp++ = LM_SLC; 1444 } 1445 1446 void 1447 slc_add_reply(unsigned int func, unsigned int flags, cc_t value) 1448 { 1449 if ((*slc_replyp++ = func) == IAC) 1450 *slc_replyp++ = IAC; 1451 if ((*slc_replyp++ = flags) == IAC) 1452 *slc_replyp++ = IAC; 1453 if ((*slc_replyp++ = (unsigned char)value) == IAC) 1454 *slc_replyp++ = IAC; 1455 } 1456 1457 void 1458 slc_end_reply(void) 1459 { 1460 int len; 1461 1462 *slc_replyp++ = IAC; 1463 *slc_replyp++ = SE; 1464 len = slc_replyp - slc_reply; 1465 if (len <= 6) 1466 return; 1467 if (NETROOM() > len) { 1468 ring_supply_data(&netoring, slc_reply, slc_replyp - slc_reply); 1469 printsub('>', &slc_reply[2], slc_replyp - slc_reply - 2); 1470 } 1471 /*@*/else printf("slc_end_reply: not enough room\n"); 1472 } 1473 1474 int 1475 slc_update(void) 1476 { 1477 struct spc *spcp; 1478 int need_update = 0; 1479 1480 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1481 if (!(spcp->flags&SLC_ACK)) 1482 continue; 1483 spcp->flags &= ~SLC_ACK; 1484 if (spcp->valp && (*spcp->valp != spcp->val)) { 1485 *spcp->valp = spcp->val; 1486 need_update = 1; 1487 } 1488 } 1489 return(need_update); 1490 } 1491 1492 #ifdef OLD_ENVIRON 1493 # ifdef ENV_HACK 1494 /* 1495 * Earlier version of telnet/telnetd from the BSD code had 1496 * the definitions of VALUE and VAR reversed. To ensure 1497 * maximum interoperability, we assume that the server is 1498 * an older BSD server, until proven otherwise. The newer 1499 * BSD servers should be able to handle either definition, 1500 * so it is better to use the wrong values if we don't 1501 * know what type of server it is. 1502 */ 1503 int env_auto = 1; 1504 int old_env_var = OLD_ENV_VAR; 1505 int old_env_value = OLD_ENV_VALUE; 1506 # else 1507 # define old_env_var OLD_ENV_VAR 1508 # define old_env_value OLD_ENV_VALUE 1509 # endif 1510 #endif 1511 1512 void 1513 env_opt(unsigned char *buf, int len) 1514 { 1515 unsigned char *ep = 0, *epc = 0; 1516 int i; 1517 1518 switch(buf[0]&0xff) { 1519 case TELQUAL_SEND: 1520 env_opt_start(); 1521 if (len == 1) { 1522 env_opt_add(NULL); 1523 } else for (i = 1; i < len; i++) { 1524 switch (buf[i]&0xff) { 1525 #ifdef OLD_ENVIRON 1526 case OLD_ENV_VAR: 1527 # ifdef ENV_HACK 1528 if (telopt_environ == TELOPT_OLD_ENVIRON 1529 && env_auto) { 1530 /* Server has the same definitions */ 1531 old_env_var = OLD_ENV_VAR; 1532 old_env_value = OLD_ENV_VALUE; 1533 } 1534 /* FALL THROUGH */ 1535 # endif 1536 case OLD_ENV_VALUE: 1537 /* 1538 * Although OLD_ENV_VALUE is not legal, we will 1539 * still recognize it, just in case it is an 1540 * old server that has VAR & VALUE mixed up... 1541 */ 1542 /* FALL THROUGH */ 1543 #else 1544 case NEW_ENV_VAR: 1545 #endif 1546 case ENV_USERVAR: 1547 if (ep) { 1548 *epc = 0; 1549 env_opt_add(ep); 1550 } 1551 ep = epc = &buf[i+1]; 1552 break; 1553 case ENV_ESC: 1554 i++; 1555 /*FALL THROUGH*/ 1556 default: 1557 if (epc) 1558 *epc++ = buf[i]; 1559 break; 1560 } 1561 } 1562 if (ep) { 1563 *epc = 0; 1564 env_opt_add(ep); 1565 } 1566 env_opt_end(1); 1567 break; 1568 1569 case TELQUAL_IS: 1570 case TELQUAL_INFO: 1571 /* Ignore for now. We shouldn't get it anyway. */ 1572 break; 1573 1574 default: 1575 break; 1576 } 1577 } 1578 1579 #define OPT_REPLY_SIZE 256 1580 unsigned char *opt_reply; 1581 unsigned char *opt_replyp; 1582 unsigned char *opt_replyend; 1583 1584 void 1585 env_opt_start(void) 1586 { 1587 unsigned char *p; 1588 1589 if (opt_reply) { 1590 p = (unsigned char *)realloc(opt_reply, OPT_REPLY_SIZE); 1591 if (p == NULL) 1592 free(opt_reply); 1593 } else 1594 p = (unsigned char *)malloc(OPT_REPLY_SIZE); 1595 opt_reply = p; 1596 if (opt_reply == NULL) { 1597 /*@*/ printf("env_opt_start: malloc()/realloc() failed!!!\n"); 1598 opt_reply = opt_replyp = opt_replyend = NULL; 1599 return; 1600 } 1601 opt_replyp = opt_reply; 1602 opt_replyend = opt_reply + OPT_REPLY_SIZE; 1603 *opt_replyp++ = IAC; 1604 *opt_replyp++ = SB; 1605 *opt_replyp++ = telopt_environ; 1606 *opt_replyp++ = TELQUAL_IS; 1607 } 1608 1609 void 1610 env_opt_start_info(void) 1611 { 1612 env_opt_start(); 1613 if (opt_replyp) 1614 opt_replyp[-1] = TELQUAL_INFO; 1615 } 1616 1617 void 1618 env_opt_add(unsigned char *ep) 1619 { 1620 unsigned char *vp, c; 1621 1622 if (opt_reply == NULL) /*XXX*/ 1623 return; /*XXX*/ 1624 1625 if (ep == NULL || *ep == '\0') { 1626 /* Send user defined variables first. */ 1627 env_default(1, 0); 1628 while ((ep = env_default(0, 0)) != NULL) 1629 env_opt_add(ep); 1630 1631 /* Now add the list of well know variables. */ 1632 env_default(1, 1); 1633 while ((ep = env_default(0, 1)) != NULL) 1634 env_opt_add(ep); 1635 return; 1636 } 1637 vp = env_getvalue(ep); 1638 if (opt_replyp + (vp ? strlen((char *)vp) : 0) + 1639 strlen((char *)ep) + 6 > opt_replyend) 1640 { 1641 int len; 1642 unsigned char *p; 1643 opt_replyend += OPT_REPLY_SIZE; 1644 len = opt_replyend - opt_reply; 1645 p = (unsigned char *)realloc(opt_reply, len); 1646 if (p == NULL) 1647 free(opt_reply); 1648 opt_reply = p; 1649 if (opt_reply == NULL) { 1650 /*@*/ printf("env_opt_add: realloc() failed!!!\n"); 1651 opt_reply = opt_replyp = opt_replyend = NULL; 1652 return; 1653 } 1654 opt_replyp = opt_reply + len - (opt_replyend - opt_replyp); 1655 opt_replyend = opt_reply + len; 1656 } 1657 if (opt_welldefined(ep)) 1658 #ifdef OLD_ENVIRON 1659 if (telopt_environ == TELOPT_OLD_ENVIRON) 1660 *opt_replyp++ = old_env_var; 1661 else 1662 #endif 1663 *opt_replyp++ = NEW_ENV_VAR; 1664 else 1665 *opt_replyp++ = ENV_USERVAR; 1666 for (;;) { 1667 while ((c = *ep++) != '\0') { 1668 switch(c&0xff) { 1669 case IAC: 1670 *opt_replyp++ = IAC; 1671 break; 1672 case NEW_ENV_VAR: 1673 case NEW_ENV_VALUE: 1674 case ENV_ESC: 1675 case ENV_USERVAR: 1676 *opt_replyp++ = ENV_ESC; 1677 break; 1678 } 1679 *opt_replyp++ = c; 1680 } 1681 if ((ep = vp) != NULL) { 1682 #ifdef OLD_ENVIRON 1683 if (telopt_environ == TELOPT_OLD_ENVIRON) 1684 *opt_replyp++ = old_env_value; 1685 else 1686 #endif 1687 *opt_replyp++ = NEW_ENV_VALUE; 1688 vp = NULL; 1689 } else 1690 break; 1691 } 1692 } 1693 1694 int 1695 opt_welldefined(char *ep) 1696 { 1697 if ((strcmp(ep, "USER") == 0) || 1698 (strcmp(ep, "DISPLAY") == 0) || 1699 (strcmp(ep, "PRINTER") == 0) || 1700 (strcmp(ep, "SYSTEMTYPE") == 0) || 1701 (strcmp(ep, "JOB") == 0) || 1702 (strcmp(ep, "ACCT") == 0)) 1703 return(1); 1704 return(0); 1705 } 1706 void 1707 env_opt_end(int emptyok) 1708 { 1709 int len; 1710 1711 len = opt_replyp - opt_reply + 2; 1712 if (emptyok || len > 6) { 1713 *opt_replyp++ = IAC; 1714 *opt_replyp++ = SE; 1715 if (NETROOM() > len) { 1716 ring_supply_data(&netoring, opt_reply, len); 1717 printsub('>', &opt_reply[2], len - 2); 1718 } 1719 /*@*/ else printf("slc_end_reply: not enough room\n"); 1720 } 1721 if (opt_reply) { 1722 free(opt_reply); 1723 opt_reply = opt_replyp = opt_replyend = NULL; 1724 } 1725 } 1726 1727 1728 1730 int 1731 telrcv(void) 1732 { 1733 int c; 1734 int scc; 1735 unsigned char *sbp = NULL; 1736 int count; 1737 int returnValue = 0; 1738 1739 scc = 0; 1740 count = 0; 1741 while (TTYROOM() > 2) { 1742 if (scc == 0) { 1743 if (count) { 1744 ring_consumed(&netiring, count); 1745 returnValue = 1; 1746 count = 0; 1747 } 1748 sbp = netiring.consume; 1749 scc = ring_full_consecutive(&netiring); 1750 if (scc == 0) { 1751 /* No more data coming in */ 1752 break; 1753 } 1754 } 1755 1756 c = *sbp++ & 0xff, scc--; count++; 1757 #ifdef ENCRYPTION 1758 if (decrypt_input) 1759 c = (*decrypt_input)(c); 1760 #endif /* ENCRYPTION */ 1761 1762 switch (telrcv_state) { 1763 1764 case TS_CR: 1765 telrcv_state = TS_DATA; 1766 if (c == '\0') { 1767 break; /* Ignore \0 after CR */ 1768 } 1769 else if ((c == '\n') && my_want_state_is_dont(TELOPT_ECHO) && !crmod) { 1770 TTYADD(c); 1771 break; 1772 } 1773 /* Else, fall through */ 1774 1775 case TS_DATA: 1776 if (c == IAC) { 1777 telrcv_state = TS_IAC; 1778 break; 1779 } 1780 # if defined(TN3270) 1781 if (In3270) { 1782 *Ifrontp++ = c; 1783 while (scc > 0) { 1784 c = *sbp++ & 0377, scc--; count++; 1785 #ifdef ENCRYPTION 1786 if (decrypt_input) 1787 c = (*decrypt_input)(c); 1788 #endif /* ENCRYPTION */ 1789 if (c == IAC) { 1790 telrcv_state = TS_IAC; 1791 break; 1792 } 1793 *Ifrontp++ = c; 1794 } 1795 } else 1796 # endif /* defined(TN3270) */ 1797 /* 1798 * The 'crmod' hack (see following) is needed 1799 * since we can't * set CRMOD on output only. 1800 * Machines like MULTICS like to send \r without 1801 * \n; since we must turn off CRMOD to get proper 1802 * input, the mapping is done here (sigh). 1803 */ 1804 if ((c == '\r') && my_want_state_is_dont(TELOPT_BINARY)) { 1805 if (scc > 0) { 1806 c = *sbp&0xff; 1807 #ifdef ENCRYPTION 1808 if (decrypt_input) 1809 c = (*decrypt_input)(c); 1810 #endif /* ENCRYPTION */ 1811 if (c == 0) { 1812 sbp++, scc--; count++; 1813 /* a "true" CR */ 1814 TTYADD('\r'); 1815 } else if (my_want_state_is_dont(TELOPT_ECHO) && 1816 (c == '\n')) { 1817 sbp++, scc--; count++; 1818 TTYADD('\n'); 1819 } else { 1820 #ifdef ENCRYPTION 1821 if (decrypt_input) 1822 (*decrypt_input)(-1); 1823 #endif /* ENCRYPTION */ 1824 1825 TTYADD('\r'); 1826 if (crmod) { 1827 TTYADD('\n'); 1828 } 1829 } 1830 } else { 1831 telrcv_state = TS_CR; 1832 TTYADD('\r'); 1833 if (crmod) { 1834 TTYADD('\n'); 1835 } 1836 } 1837 } else { 1838 TTYADD(c); 1839 } 1840 continue; 1841 1842 case TS_IAC: 1843 process_iac: 1844 switch (c) { 1845 1846 case WILL: 1847 telrcv_state = TS_WILL; 1848 continue; 1849 1850 case WONT: 1851 telrcv_state = TS_WONT; 1852 continue; 1853 1854 case DO: 1855 telrcv_state = TS_DO; 1856 continue; 1857 1858 case DONT: 1859 telrcv_state = TS_DONT; 1860 continue; 1861 1862 case DM: 1863 /* 1864 * We may have missed an urgent notification, 1865 * so make sure we flush whatever is in the 1866 * buffer currently. 1867 */ 1868 printoption("RCVD", IAC, DM); 1869 SYNCHing = 1; 1870 (void) ttyflush(1); 1871 SYNCHing = stilloob(); 1872 settimer(gotDM); 1873 break; 1874 1875 case SB: 1876 SB_CLEAR(); 1877 telrcv_state = TS_SB; 1878 continue; 1879 1880 # if defined(TN3270) 1881 case EOR: 1882 if (In3270) { 1883 if (Ibackp == Ifrontp) { 1884 Ibackp = Ifrontp = Ibuf; 1885 ISend = 0; /* should have been! */ 1886 } else { 1887 Ibackp += DataFromNetwork(Ibackp, Ifrontp-Ibackp, 1); 1888 ISend = 1; 1889 } 1890 } 1891 printoption("RCVD", IAC, EOR); 1892 break; 1893 # endif /* defined(TN3270) */ 1894 1895 case IAC: 1896 # if !defined(TN3270) 1897 TTYADD(IAC); 1898 # else /* !defined(TN3270) */ 1899 if (In3270) { 1900 *Ifrontp++ = IAC; 1901 } else { 1902 TTYADD(IAC); 1903 } 1904 # endif /* !defined(TN3270) */ 1905 break; 1906 1907 case NOP: 1908 case GA: 1909 default: 1910 printoption("RCVD", IAC, c); 1911 break; 1912 } 1913 telrcv_state = TS_DATA; 1914 continue; 1915 1916 case TS_WILL: 1917 printoption("RCVD", WILL, c); 1918 willoption(c); 1919 SetIn3270(); 1920 telrcv_state = TS_DATA; 1921 continue; 1922 1923 case TS_WONT: 1924 printoption("RCVD", WONT, c); 1925 wontoption(c); 1926 SetIn3270(); 1927 telrcv_state = TS_DATA; 1928 continue; 1929 1930 case TS_DO: 1931 printoption("RCVD", DO, c); 1932 dooption(c); 1933 SetIn3270(); 1934 if (c == TELOPT_NAWS) { 1935 sendnaws(); 1936 } else if (c == TELOPT_LFLOW) { 1937 localflow = 1; 1938 setcommandmode(); 1939 setconnmode(0); 1940 } 1941 telrcv_state = TS_DATA; 1942 continue; 1943 1944 case TS_DONT: 1945 printoption("RCVD", DONT, c); 1946 dontoption(c); 1947 flushline = 1; 1948 setconnmode(0); /* set new tty mode (maybe) */ 1949 SetIn3270(); 1950 telrcv_state = TS_DATA; 1951 continue; 1952 1953 case TS_SB: 1954 if (c == IAC) { 1955 telrcv_state = TS_SE; 1956 } else { 1957 SB_ACCUM(c); 1958 } 1959 continue; 1960 1961 case TS_SE: 1962 if (c != SE) { 1963 if (c != IAC) { 1964 /* 1965 * This is an error. We only expect to get 1966 * "IAC IAC" or "IAC SE". Several things may 1967 * have happend. An IAC was not doubled, the 1968 * IAC SE was left off, or another option got 1969 * inserted into the suboption are all possibilities. 1970 * If we assume that the IAC was not doubled, 1971 * and really the IAC SE was left off, we could 1972 * get into an infinite loop here. So, instead, 1973 * we terminate the suboption, and process the 1974 * partial suboption if we can. 1975 */ 1976 SB_ACCUM(IAC); 1977 SB_ACCUM(c); 1978 subpointer -= 2; 1979 SB_TERM(); 1980 1981 printoption("In SUBOPTION processing, RCVD", IAC, c); 1982 suboption(); /* handle sub-option */ 1983 SetIn3270(); 1984 telrcv_state = TS_IAC; 1985 goto process_iac; 1986 } 1987 SB_ACCUM(c); 1988 telrcv_state = TS_SB; 1989 } else { 1990 SB_ACCUM(IAC); 1991 SB_ACCUM(SE); 1992 subpointer -= 2; 1993 SB_TERM(); 1994 suboption(); /* handle sub-option */ 1995 SetIn3270(); 1996 telrcv_state = TS_DATA; 1997 } 1998 } 1999 } 2000 if (count) 2001 ring_consumed(&netiring, count); 2002 return returnValue||count; 2003 } 2004 2005 static int bol = 1, local = 0; 2006 2007 int 2008 rlogin_susp(void) 2009 { 2010 if (local) { 2011 local = 0; 2012 bol = 1; 2013 command(0, "z\n", 2); 2014 return(1); 2015 } 2016 return(0); 2017 } 2018 2019 static int 2020 telsnd(void) 2021 { 2022 int tcc; 2023 int count; 2024 int returnValue = 0; 2025 unsigned char *tbp = NULL; 2026 2027 tcc = 0; 2028 count = 0; 2029 while (NETROOM() > 2) { 2030 int sc; 2031 int c; 2032 2033 if (tcc == 0) { 2034 if (count) { 2035 ring_consumed(&ttyiring, count); 2036 returnValue = 1; 2037 count = 0; 2038 } 2039 tbp = ttyiring.consume; 2040 tcc = ring_full_consecutive(&ttyiring); 2041 if (tcc == 0) { 2042 break; 2043 } 2044 } 2045 c = *tbp++ & 0xff, sc = strip(c), tcc--; count++; 2046 if (rlogin != _POSIX_VDISABLE) { 2047 if (bol) { 2048 bol = 0; 2049 if (sc == rlogin) { 2050 local = 1; 2051 continue; 2052 } 2053 } else if (local) { 2054 local = 0; 2055 if (sc == '.' || c == termEofChar) { 2056 bol = 1; 2057 command(0, "close\n", 6); 2058 continue; 2059 } 2060 if (sc == termSuspChar) { 2061 bol = 1; 2062 command(0, "z\n", 2); 2063 continue; 2064 } 2065 if (sc == escape) { 2066 command(0, (char *)tbp, tcc); 2067 bol = 1; 2068 count += tcc; 2069 tcc = 0; 2070 flushline = 1; 2071 break; 2072 } 2073 if (sc != rlogin) { 2074 ++tcc; 2075 --tbp; 2076 --count; 2077 c = sc = rlogin; 2078 } 2079 } 2080 if ((sc == '\n') || (sc == '\r')) 2081 bol = 1; 2082 } else if (sc == escape && escape != _POSIX_VDISABLE) { 2083 /* 2084 * Double escape is a pass through of a single escape character. 2085 */ 2086 if (tcc && strip(*tbp) == escape) { 2087 tbp++; 2088 tcc--; 2089 count++; 2090 bol = 0; 2091 } else { 2092 command(0, (char *)tbp, tcc); 2093 bol = 1; 2094 count += tcc; 2095 tcc = 0; 2096 flushline = 1; 2097 break; 2098 } 2099 } else 2100 bol = 0; 2101 #ifdef KLUDGELINEMODE 2102 if (kludgelinemode && (globalmode&MODE_EDIT) && (sc == echoc)) { 2103 if (tcc > 0 && strip(*tbp) == echoc) { 2104 tcc--; tbp++; count++; 2105 } else { 2106 dontlecho = !dontlecho; 2107 settimer(echotoggle); 2108 setconnmode(0); 2109 flushline = 1; 2110 break; 2111 } 2112 } 2113 #endif 2114 if (sc != _POSIX_VDISABLE && MODE_LOCAL_CHARS(globalmode)) { 2115 if (TerminalSpecialChars(sc) == 0) { 2116 bol = 1; 2117 break; 2118 } 2119 } 2120 if (my_want_state_is_wont(TELOPT_BINARY)) { 2121 switch (c) { 2122 case '\n': 2123 /* 2124 * If we are in CRMOD mode (\r ==> \n) 2125 * on our local machine, then probably 2126 * a newline (unix) is CRLF (TELNET). 2127 */ 2128 if (MODE_LOCAL_CHARS(globalmode)) { 2129 NETADD('\r'); 2130 } 2131 NETADD('\n'); 2132 bol = flushline = 1; 2133 break; 2134 case '\r': 2135 if (!crlf) { 2136 NET2ADD('\r', '\0'); 2137 } else { 2138 NET2ADD('\r', '\n'); 2139 } 2140 bol = flushline = 1; 2141 break; 2142 case IAC: 2143 NET2ADD(IAC, IAC); 2144 break; 2145 default: 2146 NETADD(c); 2147 break; 2148 } 2149 } else if (c == IAC) { 2150 NET2ADD(IAC, IAC); 2151 } else { 2152 NETADD(c); 2153 } 2154 } 2155 if (count) 2156 ring_consumed(&ttyiring, count); 2157 return returnValue||count; /* Non-zero if we did anything */ 2158 } 2159 2160 /* 2162 * Scheduler() 2163 * 2164 * Try to do something. 2165 * 2166 * If we do something useful, return 1; else return 0. 2167 * 2168 */ 2169 2170 2171 int 2172 Scheduler(int block) /* should we block in the select ? */ 2173 { 2174 /* One wants to be a bit careful about setting returnValue 2175 * to one, since a one implies we did some useful work, 2176 * and therefore probably won't be called to block next 2177 * time (TN3270 mode only). 2178 */ 2179 int returnValue; 2180 int netin, netout, netex, ttyin, ttyout; 2181 2182 /* Decide which rings should be processed */ 2183 2184 netout = ring_full_count(&netoring) && 2185 (flushline || 2186 (my_want_state_is_wont(TELOPT_LINEMODE) 2187 #ifdef KLUDGELINEMODE 2188 && (!kludgelinemode || my_want_state_is_do(TELOPT_SGA)) 2189 #endif 2190 ) || 2191 my_want_state_is_will(TELOPT_BINARY)); 2192 ttyout = ring_full_count(&ttyoring); 2193 2194 #ifdef TN3270 2195 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0) && (shell_active == 0); 2196 #else /* defined(TN3270) */ 2197 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0); 2198 #endif /* defined(TN3270) */ 2199 2200 #ifdef TN3270 2201 netin = ring_empty_count(&netiring); 2202 # else /* !defined(TN3270) */ 2203 netin = !ISend && ring_empty_count(&netiring); 2204 # endif /* !defined(TN3270) */ 2205 2206 netex = !SYNCHing; 2207 2208 /* If we have seen a signal recently, reset things */ 2209 # ifdef TN3270 2210 if (HaveInput) { 2211 HaveInput = 0; 2212 (void) signal(SIGIO, inputAvailable); 2213 } 2214 #endif /* defined(TN3270) */ 2215 2216 /* Call to system code to process rings */ 2217 2218 returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block); 2219 2220 /* Now, look at the input rings, looking for work to do. */ 2221 2222 if (ring_full_count(&ttyiring)) { 2223 # if defined(TN3270) 2224 if (In3270) { 2225 int c; 2226 2227 c = DataFromTerminal(ttyiring.consume, 2228 ring_full_consecutive(&ttyiring)); 2229 if (c) { 2230 returnValue = 1; 2231 ring_consumed(&ttyiring, c); 2232 } 2233 } else { 2234 # endif /* defined(TN3270) */ 2235 returnValue |= telsnd(); 2236 # if defined(TN3270) 2237 } 2238 # endif /* defined(TN3270) */ 2239 } 2240 2241 if (ring_full_count(&netiring)) { 2242 # if !defined(TN3270) 2243 returnValue |= telrcv(); 2244 # else /* !defined(TN3270) */ 2245 returnValue = Push3270(); 2246 # endif /* !defined(TN3270) */ 2247 } 2248 return returnValue; 2249 } 2250 2251 /* 2253 * Select from tty and network... 2254 */ 2255 void 2256 telnet(const char *user) 2257 { 2258 sys_telnet_init(); 2259 2260 #if defined(AUTHENTICATION) || defined(ENCRYPTION) 2261 { 2262 static char local_host[MAXHOSTNAMELEN + 1] = { 0 }; 2263 2264 if (!local_host[0]) { 2265 gethostname(local_host, sizeof(local_host)); 2266 local_host[sizeof(local_host)-1] = 0; 2267 } 2268 auth_encrypt_init(local_host, hostname, "TELNET", 0); 2269 auth_encrypt_user(user); 2270 } 2271 #endif /* defined(AUTHENTICATION) || defined(ENCRYPTION) */ 2272 # if !defined(TN3270) 2273 if (telnetport) { 2274 #ifdef AUTHENTICATION 2275 if (autologin) 2276 send_will(TELOPT_AUTHENTICATION, 1); 2277 #endif 2278 #ifdef ENCRYPTION 2279 send_do(TELOPT_ENCRYPT, 1); 2280 send_will(TELOPT_ENCRYPT, 1); 2281 #endif /* ENCRYPTION */ 2282 send_do(TELOPT_SGA, 1); 2283 send_will(TELOPT_TTYPE, 1); 2284 send_will(TELOPT_NAWS, 1); 2285 send_will(TELOPT_TSPEED, 1); 2286 send_will(TELOPT_LFLOW, 1); 2287 send_will(TELOPT_LINEMODE, 1); 2288 send_will(TELOPT_NEW_ENVIRON, 1); 2289 send_do(TELOPT_STATUS, 1); 2290 if (env_getvalue((unsigned char *)"DISPLAY")) 2291 send_will(TELOPT_XDISPLOC, 1); 2292 if (eight) 2293 tel_enter_binary(eight); 2294 } 2295 # endif /* !defined(TN3270) */ 2296 2297 # if !defined(TN3270) 2298 for (;;) { 2299 int schedValue; 2300 2301 while ((schedValue = Scheduler(0)) != 0) { 2302 if (schedValue == -1) { 2303 setcommandmode(); 2304 return; 2305 } 2306 } 2307 2308 if (Scheduler(1) == -1) { 2309 setcommandmode(); 2310 return; 2311 } 2312 } 2313 # else /* !defined(TN3270) */ 2314 for (;;) { 2315 int schedValue; 2316 2317 while (!In3270 && !shell_active) { 2318 if (Scheduler(1) == -1) { 2319 setcommandmode(); 2320 return; 2321 } 2322 } 2323 2324 while ((schedValue = Scheduler(0)) != 0) { 2325 if (schedValue == -1) { 2326 setcommandmode(); 2327 return; 2328 } 2329 } 2330 /* If there is data waiting to go out to terminal, don't 2331 * schedule any more data for the terminal. 2332 */ 2333 if (ring_full_count(&ttyoring)) { 2334 schedValue = 1; 2335 } else { 2336 if (shell_active) { 2337 if (shell_continue() == 0) { 2338 ConnectScreen(); 2339 } 2340 } else if (In3270) { 2341 schedValue = DoTerminalOutput(); 2342 } 2343 } 2344 if (schedValue && (shell_active == 0)) { 2345 if (Scheduler(1) == -1) { 2346 setcommandmode(); 2347 return; 2348 } 2349 } 2350 } 2351 # endif /* !defined(TN3270) */ 2352 } 2353 2354 #if 0 /* XXX - this not being in is a bug */ 2356 /* 2357 * nextitem() 2358 * 2359 * Return the address of the next "item" in the TELNET data 2360 * stream. This will be the address of the next character if 2361 * the current address is a user data character, or it will 2362 * be the address of the character following the TELNET command 2363 * if the current address is a TELNET IAC ("I Am a Command") 2364 * character. 2365 */ 2366 2367 static char * 2368 nextitem(char *current) 2369 { 2370 if ((*current&0xff) != IAC) { 2371 return current+1; 2372 } 2373 switch (*(current+1)&0xff) { 2374 case DO: 2375 case DONT: 2376 case WILL: 2377 case WONT: 2378 return current+3; 2379 case SB: /* loop forever looking for the SE */ 2380 { 2381 char *look = current+2; 2382 2383 for (;;) { 2384 if ((*look++&0xff) == IAC) { 2385 if ((*look++&0xff) == SE) { 2386 return look; 2387 } 2388 } 2389 } 2390 } 2391 default: 2392 return current+2; 2393 } 2394 } 2395 #endif /* 0 */ 2396 2397 /* 2398 * netclear() 2399 * 2400 * We are about to do a TELNET SYNCH operation. Clear 2401 * the path to the network. 2402 * 2403 * Things are a bit tricky since we may have sent the first 2404 * byte or so of a previous TELNET command into the network. 2405 * So, we have to scan the network buffer from the beginning 2406 * until we are up to where we want to be. 2407 * 2408 * A side effect of what we do, just to keep things 2409 * simple, is to clear the urgent data pointer. The principal 2410 * caller should be setting the urgent data pointer AFTER calling 2411 * us in any case. 2412 */ 2413 2414 static void 2415 netclear(void) 2416 { 2417 #if 0 /* XXX */ 2418 char *thisitem, *next; 2419 char *good; 2420 #define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \ 2421 ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL)) 2422 2423 thisitem = netobuf; 2424 2425 while ((next = nextitem(thisitem)) <= netobuf.send) { 2426 thisitem = next; 2427 } 2428 2429 /* Now, thisitem is first before/at boundary. */ 2430 2431 good = netobuf; /* where the good bytes go */ 2432 2433 while (netoring.add > thisitem) { 2434 if (wewant(thisitem)) { 2435 int length; 2436 2437 next = thisitem; 2438 do { 2439 next = nextitem(next); 2440 } while (wewant(next) && (nfrontp > next)); 2441 length = next-thisitem; 2442 memmove(good, thisitem, length); 2443 good += length; 2444 thisitem = next; 2445 } else { 2446 thisitem = nextitem(thisitem); 2447 } 2448 } 2449 2450 #endif /* 0 */ 2451 } 2452 2453 /* 2455 * These routines add various telnet commands to the data stream. 2456 */ 2457 2458 static void 2459 doflush(void) 2460 { 2461 NET2ADD(IAC, DO); 2462 NETADD(TELOPT_TM); 2463 flushline = 1; 2464 flushout = 1; 2465 (void) ttyflush(1); /* Flush/drop output */ 2466 /* do printoption AFTER flush, otherwise the output gets tossed... */ 2467 printoption("SENT", DO, TELOPT_TM); 2468 } 2469 2470 void 2471 xmitAO(void) 2472 { 2473 NET2ADD(IAC, AO); 2474 printoption("SENT", IAC, AO); 2475 if (autoflush) { 2476 doflush(); 2477 } 2478 } 2479 2480 2481 void 2482 xmitEL(void) 2483 { 2484 NET2ADD(IAC, EL); 2485 printoption("SENT", IAC, EL); 2486 } 2487 2488 void 2489 xmitEC(void) 2490 { 2491 NET2ADD(IAC, EC); 2492 printoption("SENT", IAC, EC); 2493 } 2494 2495 2496 int 2497 dosynch(char *s) 2498 { 2499 netclear(); /* clear the path to the network */ 2500 NETADD(IAC); 2501 setneturg(); 2502 NETADD(DM); 2503 printoption("SENT", IAC, DM); 2504 return 1; 2505 } 2506 2507 int want_status_response = 0; 2508 2509 int 2510 get_status(char *s) 2511 { 2512 unsigned char tmp[16]; 2513 unsigned char *cp; 2514 2515 if (my_want_state_is_dont(TELOPT_STATUS)) { 2516 printf("Remote side does not support STATUS option\n"); 2517 return 0; 2518 } 2519 cp = tmp; 2520 2521 *cp++ = IAC; 2522 *cp++ = SB; 2523 *cp++ = TELOPT_STATUS; 2524 *cp++ = TELQUAL_SEND; 2525 *cp++ = IAC; 2526 *cp++ = SE; 2527 if (NETROOM() >= cp - tmp) { 2528 ring_supply_data(&netoring, tmp, cp-tmp); 2529 printsub('>', tmp+2, cp - tmp - 2); 2530 } 2531 ++want_status_response; 2532 return 1; 2533 } 2534 2535 void 2536 intp(void) 2537 { 2538 NET2ADD(IAC, IP); 2539 printoption("SENT", IAC, IP); 2540 flushline = 1; 2541 if (autoflush) { 2542 doflush(); 2543 } 2544 if (autosynch) { 2545 dosynch(NULL); 2546 } 2547 } 2548 2549 void 2550 sendbrk(void) 2551 { 2552 NET2ADD(IAC, BREAK); 2553 printoption("SENT", IAC, BREAK); 2554 flushline = 1; 2555 if (autoflush) { 2556 doflush(); 2557 } 2558 if (autosynch) { 2559 dosynch(NULL); 2560 } 2561 } 2562 2563 void 2564 sendabort(void) 2565 { 2566 NET2ADD(IAC, ABORT); 2567 printoption("SENT", IAC, ABORT); 2568 flushline = 1; 2569 if (autoflush) { 2570 doflush(); 2571 } 2572 if (autosynch) { 2573 dosynch(NULL); 2574 } 2575 } 2576 2577 void 2578 sendsusp(void) 2579 { 2580 NET2ADD(IAC, SUSP); 2581 printoption("SENT", IAC, SUSP); 2582 flushline = 1; 2583 if (autoflush) { 2584 doflush(); 2585 } 2586 if (autosynch) { 2587 dosynch(NULL); 2588 } 2589 } 2590 2591 void 2592 sendeof(void) 2593 { 2594 NET2ADD(IAC, xEOF); 2595 printoption("SENT", IAC, xEOF); 2596 } 2597 2598 void 2599 sendayt(void) 2600 { 2601 NET2ADD(IAC, AYT); 2602 printoption("SENT", IAC, AYT); 2603 } 2604 2605 /* 2606 * Send a window size update to the remote system. 2607 */ 2608 2609 void 2610 sendnaws(void) 2611 { 2612 long rows, cols; 2613 unsigned char tmp[16]; 2614 unsigned char *cp; 2615 2616 if (my_state_is_wont(TELOPT_NAWS)) 2617 return; 2618 2619 #define PUTSHORT(cp, x) { if ((*cp++ = ((x)>>8)&0xff) == IAC) *cp++ = IAC; \ 2620 if ((*cp++ = ((x))&0xff) == IAC) *cp++ = IAC; } 2621 2622 if (TerminalWindowSize(&rows, &cols) == 0) { /* Failed */ 2623 return; 2624 } 2625 2626 cp = tmp; 2627 2628 *cp++ = IAC; 2629 *cp++ = SB; 2630 *cp++ = TELOPT_NAWS; 2631 PUTSHORT(cp, cols); 2632 PUTSHORT(cp, rows); 2633 *cp++ = IAC; 2634 *cp++ = SE; 2635 if (NETROOM() >= cp - tmp) { 2636 ring_supply_data(&netoring, tmp, cp-tmp); 2637 printsub('>', tmp+2, cp - tmp - 2); 2638 } 2639 } 2640 2641 void 2642 tel_enter_binary(int rw) 2643 { 2644 if (rw&1) 2645 send_do(TELOPT_BINARY, 1); 2646 if (rw&2) 2647 send_will(TELOPT_BINARY, 1); 2648 } 2649 2650 void 2651 tel_leave_binary(int rw) 2652 { 2653 if (rw&1) 2654 send_dont(TELOPT_BINARY, 1); 2655 if (rw&2) 2656 send_wont(TELOPT_BINARY, 1); 2657 } 2658
Indexes created Sun Oct 26 13:09:57 GMT 2025