telnet.c revision 1.34.2.1
1 /* $NetBSD: telnet.c,v 1.34.2.1 2012/04/17 00:09:40 yamt 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 1.34.2.1 2012/04/17 00:09:40 yamt Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/param.h> 42 43 #include <signal.h> 44 #include <term.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 #define strip(x) ((my_want_state_is_wont(TELOPT_BINARY)) ? ((x)&0x7f) : (x)) 70 71 static unsigned char subbuffer[SUBBUFSIZE], 72 *subpointer, *subend; /* buffer for sub-options */ 73 #define SB_CLEAR() subpointer = subbuffer; 74 #define SB_TERM() { subend = subpointer; SB_CLEAR(); } 75 #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \ 76 *subpointer++ = (c); \ 77 } 78 79 #define SB_GET() ((*subpointer++)&0xff) 80 #define SB_PEEK() ((*subpointer)&0xff) 81 #define SB_EOF() (subpointer >= subend) 82 #define SB_LEN() (subend - subpointer) 83 84 char options[256]; /* The combined options */ 85 char do_dont_resp[256]; 86 char will_wont_resp[256]; 87 88 int 89 eight = 0, 90 autologin = 0, /* Autologin anyone? */ 91 skiprc = 0, 92 connected, 93 showoptions, 94 In3270, /* Are we in 3270 mode? */ 95 ISend, /* trying to send network data in */ 96 telnet_debug = 0, 97 crmod, 98 netdata, /* Print out network data flow */ 99 crlf, /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */ 100 #ifdef TN3270 101 noasynchtty = 0,/* User specified "-noasynch" on command line */ 102 noasynchnet = 0,/* User specified "-noasynch" on command line */ 103 askedSGA = 0, /* We have talked about suppress go ahead */ 104 #endif /* defined(TN3270) */ 105 telnetport, 106 SYNCHing, /* we are in TELNET SYNCH mode */ 107 flushout, /* flush output */ 108 autoflush = 0, /* flush output when interrupting? */ 109 autosynch, /* send interrupt characters with SYNCH? */ 110 localflow, /* we handle flow control locally */ 111 restartany, /* if flow control enabled, restart on any character */ 112 localchars, /* we recognize interrupt/quit */ 113 donelclchars, /* the user has set "localchars" */ 114 donebinarytoggle, /* the user has put us in binary */ 115 dontlecho, /* do we suppress local echoing right now? */ 116 globalmode, 117 doaddrlookup = 1, /* do a reverse address lookup? */ 118 clienteof = 0; 119 120 char *prompt = 0; 121 122 cc_t escape; 123 cc_t rlogin; 124 #ifdef KLUDGELINEMODE 125 cc_t echoc; 126 #endif 127 128 /* 129 * Telnet receiver states for fsm 130 */ 131 #define TS_DATA 0 132 #define TS_IAC 1 133 #define TS_WILL 2 134 #define TS_WONT 3 135 #define TS_DO 4 136 #define TS_DONT 5 137 #define TS_CR 6 138 #define TS_SB 7 /* sub-option collection */ 139 #define TS_SE 8 /* looking for sub-option end */ 140 141 static int telrcv_state; 142 #ifdef OLD_ENVIRON 143 unsigned char telopt_environ = TELOPT_NEW_ENVIRON; 144 #else 145 # define telopt_environ TELOPT_NEW_ENVIRON 146 #endif 147 148 jmp_buf toplevel = { 0 }; 149 150 int flushline; 151 int linemode; 152 153 #ifdef KLUDGELINEMODE 154 int kludgelinemode = 1; 155 #endif 156 157 static void dooption(int); 158 static void dontoption(int); 159 static void suboption(void); 160 static int telsnd(void); 161 static void netclear(void); 162 static void doflush(void); 163 164 /* 165 * The following are some clocks used to decide how to interpret 166 * the relationship between various variables. 167 */ 168 169 Clocks clocks; 170 171 #ifdef notdef 173 Modelist modelist[] = { 174 { "telnet command mode", COMMAND_LINE }, 175 { "character-at-a-time mode", 0 }, 176 { "character-at-a-time mode (local echo)", LOCAL_ECHO|LOCAL_CHARS }, 177 { "line-by-line mode (remote echo)", LINE | LOCAL_CHARS }, 178 { "line-by-line mode", LINE | LOCAL_ECHO | LOCAL_CHARS }, 179 { "line-by-line mode (local echoing suppressed)", LINE | LOCAL_CHARS }, 180 { "3270 mode", 0 }, 181 }; 182 #endif 183 184 185 /* 187 * Initialize telnet environment. 188 */ 189 190 void 191 init_telnet(void) 192 { 193 env_init(); 194 195 SB_CLEAR(); 196 ClearArray(options); 197 198 connected = In3270 = ISend = localflow = donebinarytoggle = 0; 199 #if defined(AUTHENTICATION) || defined(ENCRYPTION) 200 auth_encrypt_connect(connected); 201 #endif /* defined(AUTHENTICATION) || defined(ENCRYPTION) */ 202 restartany = -1; 203 204 SYNCHing = 0; 205 206 /* Don't change NetTrace */ 207 208 escape = CONTROL(']'); 209 rlogin = _POSIX_VDISABLE; 210 #ifdef KLUDGELINEMODE 211 echoc = CONTROL('E'); 212 #endif 213 214 flushline = 1; 215 telrcv_state = TS_DATA; 216 } 217 218 220 #ifdef notdef 221 #include <stdarg.h> 222 223 /*VARARGS*/ 224 static void 225 printring(Ring *ring, char *format, ...) 226 va_dcl 227 { 228 va_list ap; 229 char buffer[100]; /* where things go */ 230 char *ptr; 231 char *string; 232 int i; 233 234 va_start(ap, format); 235 236 ptr = buffer; 237 238 while ((i = *format++) != 0) { 239 if (i == '%') { 240 i = *format++; 241 switch (i) { 242 case 'c': 243 *ptr++ = va_arg(ap, int); 244 break; 245 case 's': 246 string = va_arg(ap, char *); 247 ring_supply_data(ring, buffer, ptr-buffer); 248 ring_supply_data(ring, string, strlen(string)); 249 ptr = buffer; 250 break; 251 case 0: 252 ExitString("printring: trailing %%.\n", 1); 253 /*NOTREACHED*/ 254 default: 255 ExitString("printring: unknown format character.\n", 1); 256 /*NOTREACHED*/ 257 } 258 } else { 259 *ptr++ = i; 260 } 261 } 262 va_end(ap); 263 ring_supply_data(ring, buffer, ptr-buffer); 264 } 265 #endif 266 267 /* 268 * These routines are in charge of sending option negotiations 269 * to the other side. 270 * 271 * The basic idea is that we send the negotiation if either side 272 * is in disagreement as to what the current state should be. 273 */ 274 275 void 276 send_do(int c, int init) 277 { 278 if (init) { 279 if (((do_dont_resp[c] == 0) && my_state_is_do(c)) || 280 my_want_state_is_do(c)) 281 return; 282 set_my_want_state_do(c); 283 do_dont_resp[c]++; 284 } 285 NET2ADD(IAC, DO); 286 NETADD(c); 287 printoption("SENT", DO, c); 288 } 289 290 void 291 send_dont(int c, int init) 292 { 293 if (init) { 294 if (((do_dont_resp[c] == 0) && my_state_is_dont(c)) || 295 my_want_state_is_dont(c)) 296 return; 297 set_my_want_state_dont(c); 298 do_dont_resp[c]++; 299 } 300 NET2ADD(IAC, DONT); 301 NETADD(c); 302 printoption("SENT", DONT, c); 303 } 304 305 void 306 send_will(int c, int init) 307 { 308 if (init) { 309 if (((will_wont_resp[c] == 0) && my_state_is_will(c)) || 310 my_want_state_is_will(c)) 311 return; 312 set_my_want_state_will(c); 313 will_wont_resp[c]++; 314 } 315 NET2ADD(IAC, WILL); 316 NETADD(c); 317 printoption("SENT", WILL, c); 318 } 319 320 void 321 send_wont(int c, int init) 322 { 323 if (init) { 324 if (((will_wont_resp[c] == 0) && my_state_is_wont(c)) || 325 my_want_state_is_wont(c)) 326 return; 327 set_my_want_state_wont(c); 328 will_wont_resp[c]++; 329 } 330 NET2ADD(IAC, WONT); 331 NETADD(c); 332 printoption("SENT", WONT, c); 333 } 334 335 336 void 337 willoption(int option) 338 { 339 int new_state_ok = 0; 340 341 if (do_dont_resp[option]) { 342 --do_dont_resp[option]; 343 if (do_dont_resp[option] && my_state_is_do(option)) 344 --do_dont_resp[option]; 345 } 346 347 if ((do_dont_resp[option] == 0) && my_want_state_is_dont(option)) { 348 349 switch (option) { 350 351 case TELOPT_ECHO: 352 # if defined(TN3270) 353 /* 354 * The following is a pain in the rear-end. 355 * Various IBM servers (some versions of Wiscnet, 356 * possibly Fibronics/Spartacus, and who knows who 357 * else) will NOT allow us to send "DO SGA" too early 358 * in the setup proceedings. On the other hand, 359 * 4.2 servers (telnetd) won't set SGA correctly. 360 * So, we are stuck. Empirically (but, based on 361 * a VERY small sample), the IBM servers don't send 362 * out anything about ECHO, so we postpone our sending 363 * "DO SGA" until we see "WILL ECHO" (which 4.2 servers 364 * DO send). 365 */ 366 { 367 if (askedSGA == 0) { 368 askedSGA = 1; 369 if (my_want_state_is_dont(TELOPT_SGA)) 370 send_do(TELOPT_SGA, 1); 371 } 372 } 373 /* Fall through */ 374 case TELOPT_EOR: 375 #endif /* defined(TN3270) */ 376 case TELOPT_BINARY: 377 case TELOPT_SGA: 378 settimer(modenegotiated); 379 /* FALL THROUGH */ 380 case TELOPT_STATUS: 381 #ifdef AUTHENTICATION 382 case TELOPT_AUTHENTICATION: 383 #ifdef ENCRYPTION 384 case TELOPT_ENCRYPT: 385 #endif /* ENCRYPTION */ 386 #endif 387 new_state_ok = 1; 388 break; 389 390 case TELOPT_TM: 391 if (flushout) 392 flushout = 0; 393 /* 394 * Special case for TM. If we get back a WILL, 395 * pretend we got back a WONT. 396 */ 397 set_my_want_state_dont(option); 398 set_my_state_dont(option); 399 return; /* Never reply to TM will's/wont's */ 400 401 case TELOPT_LINEMODE: 402 default: 403 break; 404 } 405 406 if (new_state_ok) { 407 set_my_want_state_do(option); 408 send_do(option, 0); 409 setconnmode(0); /* possibly set new tty mode */ 410 } else { 411 do_dont_resp[option]++; 412 send_dont(option, 0); 413 } 414 } 415 set_my_state_do(option); 416 #ifdef ENCRYPTION 417 if (option == TELOPT_ENCRYPT) 418 encrypt_send_support(); 419 #endif /* ENCRYPTION */ 420 } 421 422 void 423 wontoption(int option) 424 { 425 if (do_dont_resp[option]) { 426 --do_dont_resp[option]; 427 if (do_dont_resp[option] && my_state_is_dont(option)) 428 --do_dont_resp[option]; 429 } 430 431 if ((do_dont_resp[option] == 0) && my_want_state_is_do(option)) { 432 433 switch (option) { 434 435 #ifdef KLUDGELINEMODE 436 case TELOPT_SGA: 437 if (!kludgelinemode) 438 break; 439 /* FALL THROUGH */ 440 #endif 441 case TELOPT_ECHO: 442 settimer(modenegotiated); 443 break; 444 445 case TELOPT_TM: 446 if (flushout) 447 flushout = 0; 448 set_my_want_state_dont(option); 449 set_my_state_dont(option); 450 return; /* Never reply to TM will's/wont's */ 451 452 default: 453 break; 454 } 455 set_my_want_state_dont(option); 456 if (my_state_is_do(option)) 457 send_dont(option, 0); 458 setconnmode(0); /* Set new tty mode */ 459 } else if (option == TELOPT_TM) { 460 /* 461 * Special case for TM. 462 */ 463 if (flushout) 464 flushout = 0; 465 set_my_want_state_dont(option); 466 } 467 set_my_state_dont(option); 468 } 469 470 static void 471 dooption(int option) 472 { 473 int new_state_ok = 0; 474 475 if (will_wont_resp[option]) { 476 --will_wont_resp[option]; 477 if (will_wont_resp[option] && my_state_is_will(option)) 478 --will_wont_resp[option]; 479 } 480 481 if (will_wont_resp[option] == 0) { 482 if (my_want_state_is_wont(option)) { 483 484 switch (option) { 485 486 case TELOPT_TM: 487 /* 488 * Special case for TM. We send a WILL, but pretend 489 * we sent WONT. 490 */ 491 send_will(option, 0); 492 set_my_want_state_wont(TELOPT_TM); 493 set_my_state_wont(TELOPT_TM); 494 return; 495 496 # if defined(TN3270) 497 case TELOPT_EOR: /* end of record */ 498 # endif /* defined(TN3270) */ 499 case TELOPT_BINARY: /* binary mode */ 500 case TELOPT_NAWS: /* window size */ 501 case TELOPT_TSPEED: /* terminal speed */ 502 case TELOPT_LFLOW: /* local flow control */ 503 case TELOPT_TTYPE: /* terminal type option */ 504 case TELOPT_SGA: /* no big deal */ 505 #ifdef ENCRYPTION 506 case TELOPT_ENCRYPT: /* encryption variable option */ 507 #endif /* ENCRYPTION */ 508 new_state_ok = 1; 509 break; 510 511 case TELOPT_NEW_ENVIRON: /* New environment variable option */ 512 #ifdef OLD_ENVIRON 513 if (my_state_is_will(TELOPT_OLD_ENVIRON)) 514 send_wont(TELOPT_OLD_ENVIRON, 1); /* turn off the old */ 515 goto env_common; 516 case TELOPT_OLD_ENVIRON: /* Old environment variable option */ 517 if (my_state_is_will(TELOPT_NEW_ENVIRON)) 518 break; /* Don't enable if new one is in use! */ 519 env_common: 520 telopt_environ = option; 521 #endif 522 new_state_ok = 1; 523 break; 524 525 #ifdef AUTHENTICATION 526 case TELOPT_AUTHENTICATION: 527 if (autologin) 528 new_state_ok = 1; 529 break; 530 #endif 531 532 case TELOPT_XDISPLOC: /* X Display location */ 533 if (env_getvalue((const unsigned char *)"DISPLAY")) 534 new_state_ok = 1; 535 break; 536 537 case TELOPT_LINEMODE: 538 #ifdef KLUDGELINEMODE 539 kludgelinemode = 0; 540 send_do(TELOPT_SGA, 1); 541 #endif 542 set_my_want_state_will(TELOPT_LINEMODE); 543 send_will(option, 0); 544 set_my_state_will(TELOPT_LINEMODE); 545 slc_init(); 546 return; 547 548 case TELOPT_ECHO: /* We're never going to echo... */ 549 default: 550 break; 551 } 552 553 if (new_state_ok) { 554 set_my_want_state_will(option); 555 send_will(option, 0); 556 setconnmode(0); /* Set new tty mode */ 557 } else { 558 will_wont_resp[option]++; 559 send_wont(option, 0); 560 } 561 } else { 562 /* 563 * Handle options that need more things done after the 564 * other side has acknowledged the option. 565 */ 566 switch (option) { 567 case TELOPT_LINEMODE: 568 #ifdef KLUDGELINEMODE 569 kludgelinemode = 0; 570 send_do(TELOPT_SGA, 1); 571 #endif 572 set_my_state_will(option); 573 slc_init(); 574 send_do(TELOPT_SGA, 0); 575 return; 576 } 577 } 578 } 579 set_my_state_will(option); 580 } 581 582 static void 583 dontoption(int option) 584 { 585 586 if (will_wont_resp[option]) { 587 --will_wont_resp[option]; 588 if (will_wont_resp[option] && my_state_is_wont(option)) 589 --will_wont_resp[option]; 590 } 591 592 if ((will_wont_resp[option] == 0) && my_want_state_is_will(option)) { 593 switch (option) { 594 case TELOPT_LINEMODE: 595 linemode = 0; /* put us back to the default state */ 596 break; 597 #ifdef OLD_ENVIRON 598 case TELOPT_NEW_ENVIRON: 599 /* 600 * The new environ option wasn't recognized, try 601 * the old one. 602 */ 603 send_will(TELOPT_OLD_ENVIRON, 1); 604 telopt_environ = TELOPT_OLD_ENVIRON; 605 break; 606 #endif 607 } 608 /* we always accept a DONT */ 609 set_my_want_state_wont(option); 610 if (my_state_is_will(option)) 611 send_wont(option, 0); 612 setconnmode(0); /* Set new tty mode */ 613 } 614 set_my_state_wont(option); 615 } 616 617 /* 618 * Given a buffer returned by tgetent(), this routine will turn 619 * the pipe separated list of names in the buffer into an array 620 * of pointers to null terminated names. We toss out any bad, 621 * duplicate, or verbose names (names with spaces). 622 */ 623 624 static char name_unknown[] = "UNKNOWN"; 625 static char *unknown[] = { 0, 0 }; 626 627 char ** 628 mklist(char *buf, char *name) 629 { 630 int n; 631 char c, *cp, **argvp, *cp2, **argv, **avt; 632 633 if (name) { 634 if ((int)strlen(name) > 40) { 635 name = 0; 636 unknown[0] = name_unknown; 637 } else { 638 unknown[0] = name; 639 upcase(name); 640 } 641 } else 642 unknown[0] = name_unknown; 643 /* 644 * Count up the number of names. 645 */ 646 for (n = 1, cp = buf; *cp && *cp != ':'; cp++) { 647 if (*cp == '|') 648 n++; 649 } 650 /* 651 * Allocate an array to put the name pointers into 652 */ 653 argv = (char **)malloc((n+3)*sizeof(char *)); 654 if (argv == 0) 655 return(unknown); 656 657 /* 658 * Fill up the array of pointers to names. 659 */ 660 *argv = 0; 661 argvp = argv+1; 662 n = 0; 663 for (cp = cp2 = buf; (c = *cp); cp++) { 664 if (c == '|' || c == ':') { 665 *cp++ = '\0'; 666 /* 667 * Skip entries that have spaces or are over 40 668 * characters long. If this is our environment 669 * name, then put it up front. Otherwise, as 670 * long as this is not a duplicate name (case 671 * insensitive) add it to the list. 672 */ 673 if (n || (cp - cp2 > 41)) 674 ; 675 else if (name && (strncasecmp(name, cp2, cp-cp2) == 0)) 676 *argv = cp2; 677 else if (is_unique(cp2, argv+1, argvp)) 678 *argvp++ = cp2; 679 if (c == ':') 680 break; 681 /* 682 * Skip multiple delimiters. Reset cp2 to 683 * the beginning of the next name. Reset n, 684 * the flag for names with spaces. 685 */ 686 while ((c = *cp) == '|') 687 cp++; 688 cp2 = cp; 689 n = 0; 690 } 691 /* 692 * Skip entries with spaces or non-ascii values. 693 * Convert lower case letters to upper case. 694 */ 695 if ((c == ' ') || !isascii(c)) 696 n = 1; 697 else if (islower((unsigned char)c)) 698 *cp = toupper((unsigned char)c); 699 } 700 701 /* 702 * Check for an old V6 2 character name. If the second 703 * name points to the beginning of the buffer, and is 704 * only 2 characters long, move it to the end of the array. 705 */ 706 if ((argv[1] == buf) && (strlen(argv[1]) == 2)) { 707 --argvp; 708 for (avt = &argv[1]; avt < argvp; avt++) 709 *avt = *(avt+1); 710 *argvp++ = buf; 711 } 712 713 /* 714 * Duplicate last name, for TTYPE option, and null 715 * terminate the array. If we didn't find a match on 716 * our terminal name, put that name at the beginning. 717 */ 718 cp = *(argvp-1); 719 *argvp++ = cp; 720 *argvp = 0; 721 722 if (*argv == 0) { 723 if (name) 724 *argv = name; 725 else { 726 --argvp; 727 for (avt = argv; avt < argvp; avt++) 728 *avt = *(avt+1); 729 } 730 } 731 if (*argv) 732 return(argv); 733 else 734 return(unknown); 735 } 736 737 int 738 is_unique(char *name, char **as, char **ae) 739 { 740 char **ap; 741 int n; 742 743 n = strlen(name) + 1; 744 for (ap = as; ap < ae; ap++) 745 if (strncasecmp(*ap, name, n) == 0) 746 return(0); 747 return (1); 748 } 749 750 #ifdef TERMCAP 751 char *termbuf; 752 753 /*ARGSUSED*/ 754 int 755 setupterm(char *tname, int fd, int *errp) 756 { 757 char zz[1024], *zz_ptr; 758 char *ext_tc, *newptr; 759 size_t len; 760 761 if ((termbuf = malloc(1024)) == NULL) 762 goto error; 763 764 if (tgetent(termbuf, tname) == 1) { 765 /* check for ZZ capability, indicating termcap truncated */ 766 zz_ptr = zz; 767 if (tgetstr("ZZ", &zz_ptr) != NULL) { 768 /* it was, fish back the full termcap */ 769 sscanf(zz, "%p", &ext_tc); 770 len = strlen(ext_tc) + 1; 771 if ((newptr = realloc(termbuf, len)) == NULL) 772 goto error; 773 774 memcpy(newptr, ext_tc, len); 775 termbuf = newptr; 776 } 777 778 if (errp) 779 *errp = 1; 780 return(0); 781 } 782 error: 783 if (errp) 784 *errp = 0; 785 return(-1); 786 } 787 #else 788 #define termbuf ttytype 789 extern char ttytype[]; 790 #endif 791 792 int resettermname = 1; 793 794 char * 795 gettermname(void) 796 { 797 char *tname; 798 static char **tnamep = 0; 799 static char **next; 800 int err; 801 802 if (resettermname) { 803 resettermname = 0; 804 if (tnamep && tnamep != unknown) 805 free(tnamep); 806 if ((tname = (char *)env_getvalue((const unsigned char *)"TERM")) && 807 (setupterm(tname, 1, &err) == 0)) { 808 tnamep = mklist(termbuf, tname); 809 } else { 810 if (tname && ((int)strlen(tname) <= 40)) { 811 unknown[0] = tname; 812 upcase(tname); 813 } else 814 unknown[0] = name_unknown; 815 tnamep = unknown; 816 } 817 next = tnamep; 818 } 819 if (*next == 0) 820 next = tnamep; 821 return(*next++); 822 } 823 /* 824 * suboption() 825 * 826 * Look at the sub-option buffer, and try to be helpful to the other 827 * side. 828 * 829 * Currently we recognize: 830 * 831 * Terminal type, send request. 832 * Terminal speed (send request). 833 * Local flow control (is request). 834 * Linemode 835 */ 836 837 static void 838 suboption(void) 839 { 840 unsigned char subchar; 841 842 printsub('<', subbuffer, SB_LEN()+2); 843 switch (subchar = SB_GET()) { 844 case TELOPT_TTYPE: 845 if (my_want_state_is_wont(TELOPT_TTYPE)) 846 return; 847 if (SB_EOF() || SB_GET() != TELQUAL_SEND) { 848 return; 849 } else { 850 char *name; 851 unsigned char temp[50]; 852 int len; 853 854 #ifdef TN3270 855 if (tn3270_ttype()) { 856 return; 857 } 858 #endif /* defined(TN3270) */ 859 name = gettermname(); 860 len = strlen(name) + 4 + 2; 861 if (len < NETROOM()) { 862 sprintf((char *)temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE, 863 TELQUAL_IS, name, IAC, SE); 864 ring_supply_data(&netoring, temp, len); 865 printsub('>', &temp[2], len-2); 866 } else { 867 ExitString("No room in buffer for terminal type.\n", 1); 868 /*NOTREACHED*/ 869 } 870 } 871 break; 872 case TELOPT_TSPEED: 873 if (my_want_state_is_wont(TELOPT_TSPEED)) 874 return; 875 if (SB_EOF()) 876 return; 877 if (SB_GET() == TELQUAL_SEND) { 878 long osp, isp; 879 unsigned char temp[50]; 880 int len; 881 882 TerminalSpeeds(&isp, &osp); 883 884 sprintf((char *)temp, "%c%c%c%c%ld,%ld%c%c", IAC, SB, TELOPT_TSPEED, 885 TELQUAL_IS, osp, isp, IAC, SE); 886 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 887 888 if (len < NETROOM()) { 889 ring_supply_data(&netoring, temp, len); 890 printsub('>', temp+2, len - 2); 891 } 892 /*@*/ else printf("lm_will: not enough room in buffer\n"); 893 } 894 break; 895 case TELOPT_LFLOW: 896 if (my_want_state_is_wont(TELOPT_LFLOW)) 897 return; 898 if (SB_EOF()) 899 return; 900 switch(SB_GET()) { 901 case LFLOW_RESTART_ANY: 902 restartany = 1; 903 break; 904 case LFLOW_RESTART_XON: 905 restartany = 0; 906 break; 907 case LFLOW_ON: 908 localflow = 1; 909 break; 910 case LFLOW_OFF: 911 localflow = 0; 912 break; 913 default: 914 return; 915 } 916 setcommandmode(); 917 setconnmode(0); 918 break; 919 920 case TELOPT_LINEMODE: 921 if (my_want_state_is_wont(TELOPT_LINEMODE)) 922 return; 923 if (SB_EOF()) 924 return; 925 switch (SB_GET()) { 926 case WILL: 927 lm_will(subpointer, SB_LEN()); 928 break; 929 case WONT: 930 lm_wont(subpointer, SB_LEN()); 931 break; 932 case DO: 933 lm_do(subpointer, SB_LEN()); 934 break; 935 case DONT: 936 lm_dont(subpointer, SB_LEN()); 937 break; 938 case LM_SLC: 939 slc(subpointer, SB_LEN()); 940 break; 941 case LM_MODE: 942 lm_mode(subpointer, SB_LEN(), 0); 943 break; 944 default: 945 break; 946 } 947 break; 948 949 #ifdef OLD_ENVIRON 950 case TELOPT_OLD_ENVIRON: 951 #endif 952 case TELOPT_NEW_ENVIRON: 953 if (SB_EOF()) 954 return; 955 switch(SB_PEEK()) { 956 case TELQUAL_IS: 957 case TELQUAL_INFO: 958 if (my_want_state_is_dont(subchar)) 959 return; 960 break; 961 case TELQUAL_SEND: 962 if (my_want_state_is_wont(subchar)) { 963 return; 964 } 965 break; 966 default: 967 return; 968 } 969 env_opt(subpointer, SB_LEN()); 970 break; 971 972 case TELOPT_XDISPLOC: 973 if (my_want_state_is_wont(TELOPT_XDISPLOC)) 974 return; 975 if (SB_EOF()) 976 return; 977 if (SB_GET() == TELQUAL_SEND) { 978 unsigned char temp[50], *dp; 979 int len; 980 981 if ((dp = env_getvalue((const unsigned char *)"DISPLAY")) == NULL) { 982 /* 983 * Something happened, we no longer have a DISPLAY 984 * variable. So, turn off the option. 985 */ 986 send_wont(TELOPT_XDISPLOC, 1); 987 break; 988 } 989 sprintf((char *)temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_XDISPLOC, 990 TELQUAL_IS, dp, IAC, SE); 991 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */ 992 993 if (len < NETROOM()) { 994 ring_supply_data(&netoring, temp, len); 995 printsub('>', temp+2, len - 2); 996 } 997 /*@*/ else printf("lm_will: not enough room in buffer\n"); 998 } 999 break; 1000 1001 #ifdef AUTHENTICATION 1002 case TELOPT_AUTHENTICATION: { 1003 if (!autologin) 1004 break; 1005 if (SB_EOF()) 1006 return; 1007 switch(SB_GET()) { 1008 case TELQUAL_IS: 1009 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 1010 return; 1011 auth_is(subpointer, SB_LEN()); 1012 break; 1013 case TELQUAL_SEND: 1014 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 1015 return; 1016 auth_send(subpointer, SB_LEN()); 1017 break; 1018 case TELQUAL_REPLY: 1019 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) 1020 return; 1021 auth_reply(subpointer, SB_LEN()); 1022 break; 1023 case TELQUAL_NAME: 1024 if (my_want_state_is_dont(TELOPT_AUTHENTICATION)) 1025 return; 1026 auth_name(subpointer, SB_LEN()); 1027 break; 1028 } 1029 } 1030 break; 1031 #endif 1032 #ifdef ENCRYPTION 1033 case TELOPT_ENCRYPT: 1034 if (SB_EOF()) 1035 return; 1036 switch(SB_GET()) { 1037 case ENCRYPT_START: 1038 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 1039 return; 1040 encrypt_start(subpointer, SB_LEN()); 1041 break; 1042 case ENCRYPT_END: 1043 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 1044 return; 1045 encrypt_end(); 1046 break; 1047 case ENCRYPT_SUPPORT: 1048 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1049 return; 1050 encrypt_support(subpointer, SB_LEN()); 1051 break; 1052 case ENCRYPT_REQSTART: 1053 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1054 return; 1055 encrypt_request_start(subpointer, SB_LEN()); 1056 break; 1057 case ENCRYPT_REQEND: 1058 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1059 return; 1060 /* 1061 * We can always send an REQEND so that we cannot 1062 * get stuck encrypting. We should only get this 1063 * if we have been able to get in the correct mode 1064 * anyhow. 1065 */ 1066 encrypt_request_end(); 1067 break; 1068 case ENCRYPT_IS: 1069 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 1070 return; 1071 encrypt_is(subpointer, SB_LEN()); 1072 break; 1073 case ENCRYPT_REPLY: 1074 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1075 return; 1076 encrypt_reply(subpointer, SB_LEN()); 1077 break; 1078 case ENCRYPT_ENC_KEYID: 1079 if (my_want_state_is_dont(TELOPT_ENCRYPT)) 1080 return; 1081 encrypt_enc_keyid(subpointer, SB_LEN()); 1082 break; 1083 case ENCRYPT_DEC_KEYID: 1084 if (my_want_state_is_wont(TELOPT_ENCRYPT)) 1085 return; 1086 encrypt_dec_keyid(subpointer, SB_LEN()); 1087 break; 1088 default: 1089 break; 1090 } 1091 break; 1092 #endif /* ENCRYPTION */ 1093 default: 1094 break; 1095 } 1096 } 1097 1098 static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE }; 1099 1100 void 1101 lm_will(unsigned char *cmd, int len) 1102 { 1103 if (len < 1) { 1104 /*@*/ printf("lm_will: no command!!!\n"); /* Should not happen... */ 1105 return; 1106 } 1107 switch(cmd[0]) { 1108 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 1109 default: 1110 str_lm[3] = DONT; 1111 str_lm[4] = cmd[0]; 1112 if ((size_t)NETROOM() > sizeof(str_lm)) { 1113 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 1114 printsub('>', &str_lm[2], sizeof(str_lm)-2); 1115 } 1116 /*@*/ else printf("lm_will: not enough room in buffer\n"); 1117 break; 1118 } 1119 } 1120 1121 void 1122 lm_wont(unsigned char *cmd, int len) 1123 { 1124 if (len < 1) { 1125 /*@*/ printf("lm_wont: no command!!!\n"); /* Should not happen... */ 1126 return; 1127 } 1128 switch(cmd[0]) { 1129 case LM_FORWARDMASK: /* We shouldn't ever get this... */ 1130 default: 1131 /* We are always DONT, so don't respond */ 1132 return; 1133 } 1134 } 1135 1136 void 1137 lm_do(unsigned char *cmd, int len) 1138 { 1139 if (len < 1) { 1140 /*@*/ printf("lm_do: no command!!!\n"); /* Should not happen... */ 1141 return; 1142 } 1143 switch(cmd[0]) { 1144 case LM_FORWARDMASK: 1145 default: 1146 str_lm[3] = WONT; 1147 str_lm[4] = cmd[0]; 1148 if ((size_t)NETROOM() > sizeof(str_lm)) { 1149 ring_supply_data(&netoring, str_lm, sizeof(str_lm)); 1150 printsub('>', &str_lm[2], sizeof(str_lm)-2); 1151 } 1152 /*@*/ else printf("lm_do: not enough room in buffer\n"); 1153 break; 1154 } 1155 } 1156 1157 void 1158 lm_dont(unsigned char *cmd, int len) 1159 { 1160 if (len < 1) { 1161 /*@*/ printf("lm_dont: no command!!!\n"); /* Should not happen... */ 1162 return; 1163 } 1164 switch(cmd[0]) { 1165 case LM_FORWARDMASK: 1166 default: 1167 /* we are always WONT, so don't respond */ 1168 break; 1169 } 1170 } 1171 1172 static unsigned char str_lm_mode[] = { 1173 IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE 1174 }; 1175 1176 void 1177 lm_mode(unsigned char *cmd, int len, int init) 1178 { 1179 if (len != 1) 1180 return; 1181 if ((linemode&MODE_MASK&~MODE_ACK) == *cmd) 1182 return; 1183 if (*cmd&MODE_ACK) 1184 return; 1185 linemode = *cmd&(MODE_MASK&~MODE_ACK); 1186 str_lm_mode[4] = linemode; 1187 if (!init) 1188 str_lm_mode[4] |= MODE_ACK; 1189 if ((size_t)NETROOM() > sizeof(str_lm_mode)) { 1190 ring_supply_data(&netoring, str_lm_mode, sizeof(str_lm_mode)); 1191 printsub('>', &str_lm_mode[2], sizeof(str_lm_mode)-2); 1192 } 1193 /*@*/ else printf("lm_mode: not enough room in buffer\n"); 1194 setconnmode(0); /* set changed mode */ 1195 } 1196 1197 1198 1200 /* 1201 * slc() 1202 * Handle special character suboption of LINEMODE. 1203 */ 1204 1205 struct spc { 1206 cc_t val; 1207 cc_t *valp; 1208 char flags; /* Current flags & level */ 1209 char mylevel; /* Maximum level & flags */ 1210 } spc_data[NSLC+1]; 1211 1212 #define SLC_IMPORT 0 1213 #define SLC_EXPORT 1 1214 #define SLC_RVALUE 2 1215 static int slc_mode = SLC_EXPORT; 1216 1217 void 1218 slc_init(void) 1219 { 1220 struct spc *spcp; 1221 1222 localchars = 1; 1223 for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) { 1224 spcp->val = 0; 1225 spcp->valp = 0; 1226 spcp->flags = spcp->mylevel = SLC_NOSUPPORT; 1227 } 1228 1229 #define initfunc(func, flags) { \ 1230 spcp = &spc_data[func]; \ 1231 if ((spcp->valp = tcval(func)) != NULL){ \ 1232 spcp->val = *spcp->valp; \ 1233 spcp->mylevel = SLC_VARIABLE|flags; \ 1234 } else { \ 1235 spcp->val = 0; \ 1236 spcp->mylevel = SLC_DEFAULT; \ 1237 } \ 1238 } 1239 1240 initfunc(SLC_SYNCH, 0); 1241 /* No BRK */ 1242 initfunc(SLC_AO, 0); 1243 initfunc(SLC_AYT, 0); 1244 /* No EOR */ 1245 initfunc(SLC_ABORT, SLC_FLUSHIN|SLC_FLUSHOUT); 1246 initfunc(SLC_EOF, 0); 1247 initfunc(SLC_SUSP, SLC_FLUSHIN); 1248 initfunc(SLC_EC, 0); 1249 initfunc(SLC_EL, 0); 1250 initfunc(SLC_EW, 0); 1251 initfunc(SLC_RP, 0); 1252 initfunc(SLC_LNEXT, 0); 1253 initfunc(SLC_XON, 0); 1254 initfunc(SLC_XOFF, 0); 1255 initfunc(SLC_FORW1, 0); 1256 initfunc(SLC_FORW2, 0); 1257 /* No FORW2 */ 1258 1259 initfunc(SLC_IP, SLC_FLUSHIN|SLC_FLUSHOUT); 1260 #undef initfunc 1261 1262 if (slc_mode == SLC_EXPORT) 1263 slc_export(); 1264 else 1265 slc_import(1); 1266 1267 } 1268 1269 void 1270 slcstate(void) 1271 { 1272 printf("Special characters are %s values\n", 1273 slc_mode == SLC_IMPORT ? "remote default" : 1274 slc_mode == SLC_EXPORT ? "local" : 1275 "remote"); 1276 } 1277 1278 void 1279 slc_mode_export(int n) 1280 { 1281 slc_mode = SLC_EXPORT; 1282 if (my_state_is_will(TELOPT_LINEMODE)) 1283 slc_export(); 1284 } 1285 1286 void 1287 slc_mode_import(int def) 1288 { 1289 slc_mode = def ? SLC_IMPORT : SLC_RVALUE; 1290 if (my_state_is_will(TELOPT_LINEMODE)) 1291 slc_import(def); 1292 } 1293 1294 unsigned char slc_import_val[] = { 1295 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE 1296 }; 1297 unsigned char slc_import_def[] = { 1298 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE 1299 }; 1300 1301 void 1302 slc_import(int def) 1303 { 1304 if ((size_t)NETROOM() > sizeof(slc_import_val)) { 1305 if (def) { 1306 ring_supply_data(&netoring, slc_import_def, sizeof(slc_import_def)); 1307 printsub('>', &slc_import_def[2], sizeof(slc_import_def)-2); 1308 } else { 1309 ring_supply_data(&netoring, slc_import_val, sizeof(slc_import_val)); 1310 printsub('>', &slc_import_val[2], sizeof(slc_import_val)-2); 1311 } 1312 } 1313 /*@*/ else printf("slc_import: not enough room\n"); 1314 } 1315 1316 void 1317 slc_export(void) 1318 { 1319 struct spc *spcp; 1320 1321 TerminalDefaultChars(); 1322 1323 slc_start_reply(); 1324 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1325 if (spcp->mylevel != SLC_NOSUPPORT) { 1326 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1327 spcp->flags = SLC_NOSUPPORT; 1328 else 1329 spcp->flags = spcp->mylevel; 1330 if (spcp->valp) 1331 spcp->val = *spcp->valp; 1332 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1333 } 1334 } 1335 slc_end_reply(); 1336 (void)slc_update(); 1337 setconnmode(1); /* Make sure the character values are set */ 1338 } 1339 1340 void 1341 slc(unsigned char *cp, int len) 1342 { 1343 struct spc *spcp; 1344 int func,level; 1345 1346 slc_start_reply(); 1347 1348 for (; len >= 3; len -=3, cp +=3) { 1349 1350 func = cp[SLC_FUNC]; 1351 1352 if (func == 0) { 1353 /* 1354 * Client side: always ignore 0 function. 1355 */ 1356 continue; 1357 } 1358 if (func > NSLC) { 1359 if ((cp[SLC_FLAGS] & SLC_LEVELBITS) != SLC_NOSUPPORT) 1360 slc_add_reply(func, SLC_NOSUPPORT, 0); 1361 continue; 1362 } 1363 1364 spcp = &spc_data[func]; 1365 1366 level = cp[SLC_FLAGS]&(SLC_LEVELBITS|SLC_ACK); 1367 1368 if ((cp[SLC_VALUE] == (unsigned char)spcp->val) && 1369 ((level&SLC_LEVELBITS) == (spcp->flags&SLC_LEVELBITS))) { 1370 continue; 1371 } 1372 1373 if (level == (SLC_DEFAULT|SLC_ACK)) { 1374 /* 1375 * This is an error condition, the SLC_ACK 1376 * bit should never be set for the SLC_DEFAULT 1377 * level. Our best guess to recover is to 1378 * ignore the SLC_ACK bit. 1379 */ 1380 cp[SLC_FLAGS] &= ~SLC_ACK; 1381 } 1382 1383 if (level == ((spcp->flags&SLC_LEVELBITS)|SLC_ACK)) { 1384 spcp->val = (cc_t)cp[SLC_VALUE]; 1385 spcp->flags = cp[SLC_FLAGS]; /* include SLC_ACK */ 1386 continue; 1387 } 1388 1389 level &= ~SLC_ACK; 1390 1391 if (level <= (spcp->mylevel&SLC_LEVELBITS)) { 1392 spcp->flags = cp[SLC_FLAGS]|SLC_ACK; 1393 spcp->val = (cc_t)cp[SLC_VALUE]; 1394 } 1395 if (level == SLC_DEFAULT) { 1396 if ((spcp->mylevel&SLC_LEVELBITS) != SLC_DEFAULT) 1397 spcp->flags = spcp->mylevel; 1398 else 1399 spcp->flags = SLC_NOSUPPORT; 1400 } 1401 slc_add_reply(func, spcp->flags, spcp->val); 1402 } 1403 slc_end_reply(); 1404 if (slc_update()) 1405 setconnmode(1); /* set the new character values */ 1406 } 1407 1408 void 1409 slc_check(void) 1410 { 1411 struct spc *spcp; 1412 1413 slc_start_reply(); 1414 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) { 1415 if (spcp->valp && spcp->val != *spcp->valp) { 1416 spcp->val = *spcp->valp; 1417 if (spcp->val == (cc_t)(_POSIX_VDISABLE)) 1418 spcp->flags = SLC_NOSUPPORT; 1419 else 1420 spcp->flags = spcp->mylevel; 1421 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val); 1422 } 1423 } 1424 slc_end_reply(); 1425 setconnmode(1); 1426 } 1427 1428 1429 unsigned char slc_reply[128]; 1430 unsigned char *slc_replyp; 1431 1432 void 1433 slc_start_reply(void) 1434 { 1435 slc_replyp = slc_reply; 1436 *slc_replyp++ = IAC; 1437 *slc_replyp++ = SB; 1438 *slc_replyp++ = TELOPT_LINEMODE; 1439 *slc_replyp++ = LM_SLC; 1440 } 1441 1442 void 1443 slc_add_reply(unsigned int func, unsigned int flags, cc_t value) 1444 { 1445 if ((size_t)(slc_replyp - slc_reply) + 6 > sizeof(slc_reply)) 1446 return; 1447 if ((*slc_replyp++ = func) == IAC) 1448 *slc_replyp++ = IAC; 1449 if ((*slc_replyp++ = flags) == IAC) 1450 *slc_replyp++ = IAC; 1451 if ((*slc_replyp++ = (unsigned char)value) == IAC) 1452 *slc_replyp++ = IAC; 1453 } 1454 1455 void 1456 slc_end_reply(void) 1457 { 1458 int len; 1459 1460 len = slc_replyp - slc_reply; 1461 if (len <= 4 || ((size_t)len + 2 > sizeof(slc_reply))) 1462 return; 1463 *slc_replyp++ = IAC; 1464 *slc_replyp++ = SE; 1465 len += 2; 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 unsigned int len, olen, elen; 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 elen = 2 * (vp ? strlen((char *)vp) : 0) + 1639 2 * strlen((char *)ep) + 6; 1640 if ((unsigned int)(opt_replyend - opt_replyp) < elen) 1641 { 1642 unsigned char *p; 1643 len = opt_replyend - opt_reply + elen; 1644 olen = opt_replyp - 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 + olen; 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(const 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 happened. 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((const 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 Thu Oct 30 03:10:01 GMT 2025