1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char copyright[] = 10 "@(#) Copyright (c) 1989, 1993\n\ 11 The Regents of the University of California. All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)telnetd.c 8.4 (Berkeley) 05/30/95"; 16 #endif /* not lint */ 17 18 #include "telnetd.h" 19 #include "pathnames.h" 20 21 #if defined(_SC_CRAY_SECURE_SYS) && !defined(SCM_SECURITY) 22 /* 23 * UNICOS 6.0/6.1 do not have SCM_SECURITY defined, so we can 24 * use it to tell us to turn off all the socket security code, 25 * since that is only used in UNICOS 7.0 and later. 26 */ 27 # undef _SC_CRAY_SECURE_SYS 28 #endif 29 30 #if defined(_SC_CRAY_SECURE_SYS) 31 #include <sys/sysv.h> 32 #include <sys/secdev.h> 33 # ifdef SO_SEC_MULTI /* 8.0 code */ 34 #include <sys/secparm.h> 35 #include <sys/usrv.h> 36 # endif /* SO_SEC_MULTI */ 37 int secflag; 38 char tty_dev[16]; 39 struct secdev dv; 40 struct sysv sysv; 41 # ifdef SO_SEC_MULTI /* 8.0 code */ 42 struct socksec ss; 43 # else /* SO_SEC_MULTI */ /* 7.0 code */ 44 struct socket_security ss; 45 # endif /* SO_SEC_MULTI */ 46 #endif /* _SC_CRAY_SECURE_SYS */ 47 48 #if defined(AUTHENTICATION) 49 #include <libtelnet/auth.h> 50 int auth_level = 0; 51 #endif 52 #if defined(SecurID) 53 int require_SecurID = 0; 54 #endif 55 56 extern int utmp_len; 57 int registerd_host_only = 0; 58 59 #ifdef STREAMSPTY 60 # include <stropts.h> 61 # include <termio.h> 62 /* make sure we don't get the bsd version */ 63 # include "/usr/include/sys/tty.h" 64 # include <sys/ptyvar.h> 65 66 /* 67 * Because of the way ptyibuf is used with streams messages, we need 68 * ptyibuf+1 to be on a full-word boundary. The following wierdness 69 * is simply to make that happen. 70 */ 71 long ptyibufbuf[BUFSIZ/sizeof(long)+1]; 72 char *ptyibuf = ((char *)&ptyibufbuf[1])-1; 73 char *ptyip = ((char *)&ptyibufbuf[1])-1; 74 char ptyibuf2[BUFSIZ]; 75 unsigned char ctlbuf[BUFSIZ]; 76 struct strbuf strbufc, strbufd; 77 78 int readstream(); 79 80 #else /* ! STREAMPTY */ 81 82 /* 83 * I/O data buffers, 84 * pointers, and counters. 85 */ 86 char ptyibuf[BUFSIZ], *ptyip = ptyibuf; 87 char ptyibuf2[BUFSIZ]; 88 89 #endif /* ! STREAMPTY */ 90 91 int hostinfo = 1; /* do we print login banner? */ 92 93 #ifdef CRAY 94 extern int newmap; /* nonzero if \n maps to ^M^J */ 95 int lowpty = 0, highpty; /* low, high pty numbers */ 96 #endif /* CRAY */ 97 98 int debug = 0; 99 int keepalive = 1; 100 char *progname; 101 102 extern void usage P((void)); 103 104 /* 105 * The string to pass to getopt(). We do it this way so 106 * that only the actual options that we support will be 107 * passed off to getopt(). 108 */ 109 char valid_opts[] = { 110 'd', ':', 'h', 'k', 'n', 'S', ':', 'u', ':', 'U', 111 #ifdef AUTHENTICATION 112 'a', ':', 'X', ':', 113 #endif 114 #ifdef BFTPDAEMON 115 'B', 116 #endif 117 #ifdef DIAGNOSTICS 118 'D', ':', 119 #endif 120 #ifdef ENCRYPTION 121 'e', ':', 122 #endif 123 #if defined(CRAY) && defined(NEWINIT) 124 'I', ':', 125 #endif 126 #ifdef LINEMODE 127 'l', 128 #endif 129 #ifdef CRAY 130 'r', ':', 131 #endif 132 #ifdef SecurID 133 's', 134 #endif 135 '\0' 136 }; 137 138 main(argc, argv) 139 char *argv[]; 140 { 141 struct sockaddr_in from; 142 int on = 1, fromlen; 143 register int ch; 144 extern char *optarg; 145 extern int optind; 146 #if defined(IPPROTO_IP) && defined(IP_TOS) 147 int tos = -1; 148 #endif 149 150 pfrontp = pbackp = ptyobuf; 151 netip = netibuf; 152 nfrontp = nbackp = netobuf; 153 #ifdef ENCRYPTION 154 nclearto = 0; 155 #endif /* ENCRYPTION */ 156 157 progname = *argv; 158 159 #ifdef CRAY 160 /* 161 * Get number of pty's before trying to process options, 162 * which may include changing pty range. 163 */ 164 highpty = getnpty(); 165 #endif /* CRAY */ 166 167 while ((ch = getopt(argc, argv, valid_opts)) != EOF) { 168 switch(ch) { 169 170 #ifdef AUTHENTICATION 171 case 'a': 172 /* 173 * Check for required authentication level 174 */ 175 if (strcmp(optarg, "debug") == 0) { 176 extern int auth_debug_mode; 177 auth_debug_mode = 1; 178 } else if (strcasecmp(optarg, "none") == 0) { 179 auth_level = 0; 180 } else if (strcasecmp(optarg, "other") == 0) { 181 auth_level = AUTH_OTHER; 182 } else if (strcasecmp(optarg, "user") == 0) { 183 auth_level = AUTH_USER; 184 } else if (strcasecmp(optarg, "valid") == 0) { 185 auth_level = AUTH_VALID; 186 } else if (strcasecmp(optarg, "off") == 0) { 187 /* 188 * This hack turns off authentication 189 */ 190 auth_level = -1; 191 } else { 192 fprintf(stderr, 193 "telnetd: unknown authorization level for -a\n"); 194 } 195 break; 196 #endif /* AUTHENTICATION */ 197 198 #ifdef BFTPDAEMON 199 case 'B': 200 bftpd++; 201 break; 202 #endif /* BFTPDAEMON */ 203 204 case 'd': 205 if (strcmp(optarg, "ebug") == 0) { 206 debug++; 207 break; 208 } 209 usage(); 210 /* NOTREACHED */ 211 break; 212 213 #ifdef DIAGNOSTICS 214 case 'D': 215 /* 216 * Check for desired diagnostics capabilities. 217 */ 218 if (!strcmp(optarg, "report")) { 219 diagnostic |= TD_REPORT|TD_OPTIONS; 220 } else if (!strcmp(optarg, "exercise")) { 221 diagnostic |= TD_EXERCISE; 222 } else if (!strcmp(optarg, "netdata")) { 223 diagnostic |= TD_NETDATA; 224 } else if (!strcmp(optarg, "ptydata")) { 225 diagnostic |= TD_PTYDATA; 226 } else if (!strcmp(optarg, "options")) { 227 diagnostic |= TD_OPTIONS; 228 } else { 229 usage(); 230 /* NOT REACHED */ 231 } 232 break; 233 #endif /* DIAGNOSTICS */ 234 235 #ifdef ENCRYPTION 236 case 'e': 237 if (strcmp(optarg, "debug") == 0) { 238 extern int encrypt_debug_mode; 239 encrypt_debug_mode = 1; 240 break; 241 } 242 usage(); 243 /* NOTREACHED */ 244 break; 245 #endif /* ENCRYPTION */ 246 247 case 'h': 248 hostinfo = 0; 249 break; 250 251 #if defined(CRAY) && defined(NEWINIT) 252 case 'I': 253 { 254 extern char *gen_id; 255 gen_id = optarg; 256 break; 257 } 258 #endif /* defined(CRAY) && defined(NEWINIT) */ 259 260 #ifdef LINEMODE 261 case 'l': 262 alwayslinemode = 1; 263 break; 264 #endif /* LINEMODE */ 265 266 case 'k': 267 #if defined(LINEMODE) && defined(KLUDGELINEMODE) 268 lmodetype = NO_AUTOKLUDGE; 269 #else 270 /* ignore -k option if built without kludge linemode */ 271 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */ 272 break; 273 274 case 'n': 275 keepalive = 0; 276 break; 277 278 #ifdef CRAY 279 case 'r': 280 { 281 char *strchr(); 282 char *c; 283 284 /* 285 * Allow the specification of alterations 286 * to the pty search range. It is legal to 287 * specify only one, and not change the 288 * other from its default. 289 */ 290 c = strchr(optarg, '-'); 291 if (c) { 292 *c++ = '\0'; 293 highpty = atoi(c); 294 } 295 if (*optarg != '\0') 296 lowpty = atoi(optarg); 297 if ((lowpty > highpty) || (lowpty < 0) || 298 (highpty > 32767)) { 299 usage(); 300 /* NOT REACHED */ 301 } 302 break; 303 } 304 #endif /* CRAY */ 305 306 #ifdef SecurID 307 case 's': 308 /* SecurID required */ 309 require_SecurID = 1; 310 break; 311 #endif /* SecurID */ 312 case 'S': 313 #ifdef HAS_GETTOS 314 if ((tos = parsetos(optarg, "tcp")) < 0) 315 fprintf(stderr, "%s%s%s\n", 316 "telnetd: Bad TOS argument '", optarg, 317 "'; will try to use default TOS"); 318 #else 319 fprintf(stderr, "%s%s\n", "TOS option unavailable; ", 320 "-S flag not supported\n"); 321 #endif 322 break; 323 324 case 'u': 325 utmp_len = atoi(optarg); 326 break; 327 328 case 'U': 329 registerd_host_only = 1; 330 break; 331 332 #ifdef AUTHENTICATION 333 case 'X': 334 /* 335 * Check for invalid authentication types 336 */ 337 auth_disable_name(optarg); 338 break; 339 #endif /* AUTHENTICATION */ 340 341 default: 342 fprintf(stderr, "telnetd: %c: unknown option\n", ch); 343 /* FALLTHROUGH */ 344 case '?': 345 usage(); 346 /* NOTREACHED */ 347 } 348 } 349 350 argc -= optind; 351 argv += optind; 352 353 if (debug) { 354 int s, ns, foo; 355 struct servent *sp; 356 static struct sockaddr_in sin = { AF_INET }; 357 358 if (argc > 1) { 359 usage(); 360 /* NOT REACHED */ 361 } else if (argc == 1) { 362 if (sp = getservbyname(*argv, "tcp")) { 363 sin.sin_port = sp->s_port; 364 } else { 365 sin.sin_port = atoi(*argv); 366 if ((int)sin.sin_port <= 0) { 367 fprintf(stderr, "telnetd: %s: bad port #\n", *argv); 368 usage(); 369 /* NOT REACHED */ 370 } 371 sin.sin_port = htons((u_short)sin.sin_port); 372 } 373 } else { 374 sp = getservbyname("telnet", "tcp"); 375 if (sp == 0) { 376 fprintf(stderr, "telnetd: tcp/telnet: unknown service\n"); 377 exit(1); 378 } 379 sin.sin_port = sp->s_port; 380 } 381 382 s = socket(AF_INET, SOCK_STREAM, 0); 383 if (s < 0) { 384 perror("telnetd: socket");; 385 exit(1); 386 } 387 (void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 388 (char *)&on, sizeof(on)); 389 if (bind(s, (struct sockaddr *)&sin, sizeof sin) < 0) { 390 perror("bind"); 391 exit(1); 392 } 393 if (listen(s, 1) < 0) { 394 perror("listen"); 395 exit(1); 396 } 397 foo = sizeof sin; 398 ns = accept(s, (struct sockaddr *)&sin, &foo); 399 if (ns < 0) { 400 perror("accept"); 401 exit(1); 402 } 403 (void) dup2(ns, 0); 404 (void) close(ns); 405 (void) close(s); 406 #ifdef convex 407 } else if (argc == 1) { 408 ; /* VOID*/ /* Just ignore the host/port name */ 409 #endif 410 } else if (argc > 0) { 411 usage(); 412 /* NOT REACHED */ 413 } 414 415 #if defined(_SC_CRAY_SECURE_SYS) 416 secflag = sysconf(_SC_CRAY_SECURE_SYS); 417 418 /* 419 * Get socket's security label 420 */ 421 if (secflag) { 422 int szss = sizeof(ss); 423 #ifdef SO_SEC_MULTI /* 8.0 code */ 424 int sock_multi; 425 int szi = sizeof(int); 426 #endif /* SO_SEC_MULTI */ 427 428 memset((char *)&dv, 0, sizeof(dv)); 429 430 if (getsysv(&sysv, sizeof(struct sysv)) != 0) { 431 perror("getsysv"); 432 exit(1); 433 } 434 435 /* 436 * Get socket security label and set device values 437 * {security label to be set on ttyp device} 438 */ 439 #ifdef SO_SEC_MULTI /* 8.0 code */ 440 if ((getsockopt(0, SOL_SOCKET, SO_SECURITY, 441 (char *)&ss, &szss) < 0) || 442 (getsockopt(0, SOL_SOCKET, SO_SEC_MULTI, 443 (char *)&sock_multi, &szi) < 0)) { 444 perror("getsockopt"); 445 exit(1); 446 } else { 447 dv.dv_actlvl = ss.ss_actlabel.lt_level; 448 dv.dv_actcmp = ss.ss_actlabel.lt_compart; 449 if (!sock_multi) { 450 dv.dv_minlvl = dv.dv_maxlvl = dv.dv_actlvl; 451 dv.dv_valcmp = dv.dv_actcmp; 452 } else { 453 dv.dv_minlvl = ss.ss_minlabel.lt_level; 454 dv.dv_maxlvl = ss.ss_maxlabel.lt_level; 455 dv.dv_valcmp = ss.ss_maxlabel.lt_compart; 456 } 457 dv.dv_devflg = 0; 458 } 459 #else /* SO_SEC_MULTI */ /* 7.0 code */ 460 if (getsockopt(0, SOL_SOCKET, SO_SECURITY, 461 (char *)&ss, &szss) >= 0) { 462 dv.dv_actlvl = ss.ss_slevel; 463 dv.dv_actcmp = ss.ss_compart; 464 dv.dv_minlvl = ss.ss_minlvl; 465 dv.dv_maxlvl = ss.ss_maxlvl; 466 dv.dv_valcmp = ss.ss_maxcmp; 467 } 468 #endif /* SO_SEC_MULTI */ 469 } 470 #endif /* _SC_CRAY_SECURE_SYS */ 471 472 openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON); 473 fromlen = sizeof (from); 474 if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) { 475 fprintf(stderr, "%s: ", progname); 476 perror("getpeername"); 477 _exit(1); 478 } 479 if (keepalive && 480 setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, 481 (char *)&on, sizeof (on)) < 0) { 482 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 483 } 484 485 #if defined(IPPROTO_IP) && defined(IP_TOS) 486 { 487 # if defined(HAS_GETTOS) 488 struct tosent *tp; 489 if (tos < 0 && (tp = gettosbyname("telnet", "tcp"))) 490 tos = tp->t_tos; 491 # endif 492 if (tos < 0) 493 tos = 020; /* Low Delay bit */ 494 if (tos 495 && (setsockopt(0, IPPROTO_IP, IP_TOS, 496 (char *)&tos, sizeof(tos)) < 0) 497 && (errno != ENOPROTOOPT) ) 498 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 499 } 500 #endif /* defined(IPPROTO_IP) && defined(IP_TOS) */ 501 net = 0; 502 doit(&from); 503 /* NOTREACHED */ 504 } /* end of main */ 505 506 void 507 usage() 508 { 509 fprintf(stderr, "Usage: telnetd"); 510 #ifdef AUTHENTICATION 511 fprintf(stderr, " [-a (debug|other|user|valid|off|none)]\n\t"); 512 #endif 513 #ifdef BFTPDAEMON 514 fprintf(stderr, " [-B]"); 515 #endif 516 fprintf(stderr, " [-debug]"); 517 #ifdef DIAGNOSTICS 518 fprintf(stderr, " [-D (options|report|exercise|netdata|ptydata)]\n\t"); 519 #endif 520 #ifdef AUTHENTICATION 521 fprintf(stderr, " [-edebug]"); 522 #endif 523 fprintf(stderr, " [-h]"); 524 #if defined(CRAY) && defined(NEWINIT) 525 fprintf(stderr, " [-Iinitid]"); 526 #endif 527 #if defined(LINEMODE) && defined(KLUDGELINEMODE) 528 fprintf(stderr, " [-k]"); 529 #endif 530 #ifdef LINEMODE 531 fprintf(stderr, " [-l]"); 532 #endif 533 fprintf(stderr, " [-n]"); 534 #ifdef CRAY 535 fprintf(stderr, " [-r[lowpty]-[highpty]]"); 536 #endif 537 fprintf(stderr, "\n\t"); 538 #ifdef SecurID 539 fprintf(stderr, " [-s]"); 540 #endif 541 #ifdef HAS_GETTOS 542 fprintf(stderr, " [-S tos]"); 543 #endif 544 #ifdef AUTHENTICATION 545 fprintf(stderr, " [-X auth-type]"); 546 #endif 547 fprintf(stderr, " [-u utmp_hostname_length] [-U]"); 548 fprintf(stderr, " [port]\n"); 549 exit(1); 550 } 551 552 /* 553 * getterminaltype 554 * 555 * Ask the other end to send along its terminal type and speed. 556 * Output is the variable terminaltype filled in. 557 */ 558 static unsigned char ttytype_sbbuf[] = { 559 IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE 560 }; 561 562 int 563 getterminaltype(name) 564 char *name; 565 { 566 int retval = -1; 567 void _gettermname(); 568 569 settimer(baseline); 570 #if defined(AUTHENTICATION) 571 /* 572 * Handle the Authentication option before we do anything else. 573 */ 574 send_do(TELOPT_AUTHENTICATION, 1); 575 while (his_will_wont_is_changing(TELOPT_AUTHENTICATION)) 576 ttloop(); 577 if (his_state_is_will(TELOPT_AUTHENTICATION)) { 578 retval = auth_wait(name); 579 } 580 #endif 581 582 #ifdef ENCRYPTION 583 send_will(TELOPT_ENCRYPT, 1); 584 #endif /* ENCRYPTION */ 585 send_do(TELOPT_TTYPE, 1); 586 send_do(TELOPT_TSPEED, 1); 587 send_do(TELOPT_XDISPLOC, 1); 588 send_do(TELOPT_NEW_ENVIRON, 1); 589 send_do(TELOPT_OLD_ENVIRON, 1); 590 while ( 591 #ifdef ENCRYPTION 592 his_do_dont_is_changing(TELOPT_ENCRYPT) || 593 #endif /* ENCRYPTION */ 594 his_will_wont_is_changing(TELOPT_TTYPE) || 595 his_will_wont_is_changing(TELOPT_TSPEED) || 596 his_will_wont_is_changing(TELOPT_XDISPLOC) || 597 his_will_wont_is_changing(TELOPT_NEW_ENVIRON) || 598 his_will_wont_is_changing(TELOPT_OLD_ENVIRON)) { 599 ttloop(); 600 } 601 #ifdef ENCRYPTION 602 /* 603 * Wait for the negotiation of what type of encryption we can 604 * send with. If autoencrypt is not set, this will just return. 605 */ 606 if (his_state_is_will(TELOPT_ENCRYPT)) { 607 encrypt_wait(); 608 } 609 #endif /* ENCRYPTION */ 610 if (his_state_is_will(TELOPT_TSPEED)) { 611 static unsigned char sb[] = 612 { IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE }; 613 614 memmove(nfrontp, sb, sizeof sb); 615 nfrontp += sizeof sb; 616 DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); 617 } 618 if (his_state_is_will(TELOPT_XDISPLOC)) { 619 static unsigned char sb[] = 620 { IAC, SB, TELOPT_XDISPLOC, TELQUAL_SEND, IAC, SE }; 621 622 memmove(nfrontp, sb, sizeof sb); 623 nfrontp += sizeof sb; 624 DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); 625 } 626 if (his_state_is_will(TELOPT_NEW_ENVIRON)) { 627 static unsigned char sb[] = 628 { IAC, SB, TELOPT_NEW_ENVIRON, TELQUAL_SEND, IAC, SE }; 629 630 memmove(nfrontp, sb, sizeof sb); 631 nfrontp += sizeof sb; 632 DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); 633 } 634 else if (his_state_is_will(TELOPT_OLD_ENVIRON)) { 635 static unsigned char sb[] = 636 { IAC, SB, TELOPT_OLD_ENVIRON, TELQUAL_SEND, IAC, SE }; 637 638 memmove(nfrontp, sb, sizeof sb); 639 nfrontp += sizeof sb; 640 DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); 641 } 642 if (his_state_is_will(TELOPT_TTYPE)) { 643 644 memmove(nfrontp, ttytype_sbbuf, sizeof ttytype_sbbuf); 645 nfrontp += sizeof ttytype_sbbuf; 646 DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2, 647 sizeof ttytype_sbbuf - 2);); 648 } 649 if (his_state_is_will(TELOPT_TSPEED)) { 650 while (sequenceIs(tspeedsubopt, baseline)) 651 ttloop(); 652 } 653 if (his_state_is_will(TELOPT_XDISPLOC)) { 654 while (sequenceIs(xdisplocsubopt, baseline)) 655 ttloop(); 656 } 657 if (his_state_is_will(TELOPT_NEW_ENVIRON)) { 658 while (sequenceIs(environsubopt, baseline)) 659 ttloop(); 660 } 661 if (his_state_is_will(TELOPT_OLD_ENVIRON)) { 662 while (sequenceIs(oenvironsubopt, baseline)) 663 ttloop(); 664 } 665 if (his_state_is_will(TELOPT_TTYPE)) { 666 char first[256], last[256]; 667 668 while (sequenceIs(ttypesubopt, baseline)) 669 ttloop(); 670 671 /* 672 * If the other side has already disabled the option, then 673 * we have to just go with what we (might) have already gotten. 674 */ 675 if (his_state_is_will(TELOPT_TTYPE) && !terminaltypeok(terminaltype)) { 676 (void) strncpy(first, terminaltype, sizeof(first)); 677 for(;;) { 678 /* 679 * Save the unknown name, and request the next name. 680 */ 681 (void) strncpy(last, terminaltype, sizeof(last)); 682 _gettermname(); 683 if (terminaltypeok(terminaltype)) 684 break; 685 if ((strncmp(last, terminaltype, sizeof(last)) == 0) || 686 his_state_is_wont(TELOPT_TTYPE)) { 687 /* 688 * We've hit the end. If this is the same as 689 * the first name, just go with it. 690 */ 691 if (strncmp(first, terminaltype, sizeof(first)) == 0) 692 break; 693 /* 694 * Get the terminal name one more time, so that 695 * RFC1091 compliant telnets will cycle back to 696 * the start of the list. 697 */ 698 _gettermname(); 699 if (strncmp(first, terminaltype, sizeof(first)) != 0) 700 (void) strncpy(terminaltype, first, sizeof(first)); 701 break; 702 } 703 } 704 } 705 } 706 return(retval); 707 } /* end of getterminaltype */ 708 709 void 710 _gettermname() 711 { 712 /* 713 * If the client turned off the option, 714 * we can't send another request, so we 715 * just return. 716 */ 717 if (his_state_is_wont(TELOPT_TTYPE)) 718 return; 719 settimer(baseline); 720 memmove(nfrontp, ttytype_sbbuf, sizeof ttytype_sbbuf); 721 nfrontp += sizeof ttytype_sbbuf; 722 DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2, 723 sizeof ttytype_sbbuf - 2);); 724 while (sequenceIs(ttypesubopt, baseline)) 725 ttloop(); 726 } 727 728 int 729 terminaltypeok(s) 730 char *s; 731 { 732 char buf[1024]; 733 734 if (terminaltype == NULL) 735 return(1); 736 737 /* 738 * tgetent() will return 1 if the type is known, and 739 * 0 if it is not known. If it returns -1, it couldn't 740 * open the database. But if we can't open the database, 741 * it won't help to say we failed, because we won't be 742 * able to verify anything else. So, we treat -1 like 1. 743 */ 744 if (tgetent(buf, s) == 0) 745 return(0); 746 return(1); 747 } 748 749 #ifndef MAXHOSTNAMELEN 750 #define MAXHOSTNAMELEN 64 751 #endif /* MAXHOSTNAMELEN */ 752 753 char *hostname; 754 char host_name[MAXHOSTNAMELEN]; 755 char remote_host_name[MAXHOSTNAMELEN]; 756 757 #ifndef convex 758 extern void telnet P((int, int)); 759 #else 760 extern void telnet P((int, int, char *)); 761 #endif 762 763 /* 764 * Get a pty, scan input lines. 765 */ 766 doit(who) 767 struct sockaddr_in *who; 768 { 769 char *host, *inet_ntoa(); 770 int t; 771 struct hostent *hp; 772 int level; 773 int ptynum; 774 char user_name[256]; 775 776 /* 777 * Find an available pty to use. 778 */ 779 #ifndef convex 780 pty = getpty(&ptynum); 781 if (pty < 0) 782 fatal(net, "All network ports in use"); 783 #else 784 for (;;) { 785 char *lp; 786 extern char *line, *getpty(); 787 788 if ((lp = getpty()) == NULL) 789 fatal(net, "Out of ptys"); 790 791 if ((pty = open(lp, 2)) >= 0) { 792 strcpy(line,lp); 793 line[5] = 't'; 794 break; 795 } 796 } 797 #endif 798 799 #if defined(_SC_CRAY_SECURE_SYS) 800 /* 801 * set ttyp line security label 802 */ 803 if (secflag) { 804 char slave_dev[16]; 805 806 sprintf(tty_dev, "/dev/pty/%03d", ptynum); 807 if (setdevs(tty_dev, &dv) < 0) 808 fatal(net, "cannot set pty security"); 809 sprintf(slave_dev, "/dev/ttyp%03d", ptynum); 810 if (setdevs(slave_dev, &dv) < 0) 811 fatal(net, "cannot set tty security"); 812 } 813 #endif /* _SC_CRAY_SECURE_SYS */ 814 815 /* get name of connected client */ 816 hp = gethostbyaddr((char *)&who->sin_addr, sizeof (struct in_addr), 817 who->sin_family); 818 819 if (hp == NULL && registerd_host_only) { 820 fatal(net, "Couldn't resolve your address into a host name.\r\n\ 821 Please contact your net administrator"); 822 } else if (hp && 823 (strlen(hp->h_name) <= (unsigned int)((utmp_len < 0) ? -utmp_len 824 : utmp_len))) { 825 host = hp->h_name; 826 } else { 827 host = inet_ntoa(who->sin_addr); 828 } 829 /* 830 * We must make a copy because Kerberos is probably going 831 * to also do a gethost* and overwrite the static data... 832 */ 833 strncpy(remote_host_name, host, sizeof(remote_host_name)-1); 834 remote_host_name[sizeof(remote_host_name)-1] = 0; 835 host = remote_host_name; 836 837 (void) gethostname(host_name, sizeof (host_name)); 838 hostname = host_name; 839 840 #if defined(AUTHENTICATION) || defined(ENCRYPTION) 841 auth_encrypt_init(hostname, host, "TELNETD", 1); 842 #endif 843 844 init_env(); 845 /* 846 * get terminal type. 847 */ 848 *user_name = 0; 849 level = getterminaltype(user_name); 850 setenv("TERM", terminaltype ? terminaltype : "network", 1); 851 852 /* 853 * Start up the login process on the slave side of the terminal 854 */ 855 #ifndef convex 856 startslave(host, level, user_name); 857 858 #if defined(_SC_CRAY_SECURE_SYS) 859 if (secflag) { 860 if (setulvl(dv.dv_actlvl) < 0) 861 fatal(net,"cannot setulvl()"); 862 if (setucmp(dv.dv_actcmp) < 0) 863 fatal(net, "cannot setucmp()"); 864 } 865 #endif /* _SC_CRAY_SECURE_SYS */ 866 867 telnet(net, pty); /* begin server processing */ 868 #else 869 telnet(net, pty, host); 870 #endif 871 /*NOTREACHED*/ 872 } /* end of doit */ 873 874 #if defined(CRAY2) && defined(UNICOS5) && defined(UNICOS50) 875 int 876 Xterm_output(ibufp, obuf, icountp, ocount) 877 char **ibufp, *obuf; 878 int *icountp, ocount; 879 { 880 int ret; 881 ret = term_output(*ibufp, obuf, *icountp, ocount); 882 *ibufp += *icountp; 883 *icountp = 0; 884 return(ret); 885 } 886 #define term_output Xterm_output 887 #endif /* defined(CRAY2) && defined(UNICOS5) && defined(UNICOS50) */ 888 889 /* 890 * Main loop. Select from pty and network, and 891 * hand data to telnet receiver finite state machine. 892 */ 893 void 894 #ifndef convex 895 telnet(f, p) 896 #else 897 telnet(f, p, host) 898 #endif 899 int f, p; 900 #ifdef convex 901 char *host; 902 #endif 903 { 904 int on = 1; 905 #define TABBUFSIZ 512 906 char defent[TABBUFSIZ]; 907 char defstrs[TABBUFSIZ]; 908 #undef TABBUFSIZ 909 char *HE; 910 char *HN; 911 char *IM; 912 void netflush(); 913 int nfd; 914 915 /* 916 * Initialize the slc mapping table. 917 */ 918 get_slc_defaults(); 919 920 /* 921 * Do some tests where it is desireable to wait for a response. 922 * Rather than doing them slowly, one at a time, do them all 923 * at once. 924 */ 925 if (my_state_is_wont(TELOPT_SGA)) 926 send_will(TELOPT_SGA, 1); 927 /* 928 * Is the client side a 4.2 (NOT 4.3) system? We need to know this 929 * because 4.2 clients are unable to deal with TCP urgent data. 930 * 931 * To find out, we send out a "DO ECHO". If the remote system 932 * answers "WILL ECHO" it is probably a 4.2 client, and we note 933 * that fact ("WILL ECHO" ==> that the client will echo what 934 * WE, the server, sends it; it does NOT mean that the client will 935 * echo the terminal input). 936 */ 937 send_do(TELOPT_ECHO, 1); 938 939 #ifdef LINEMODE 940 if (his_state_is_wont(TELOPT_LINEMODE)) { 941 /* Query the peer for linemode support by trying to negotiate 942 * the linemode option. 943 */ 944 linemode = 0; 945 editmode = 0; 946 send_do(TELOPT_LINEMODE, 1); /* send do linemode */ 947 } 948 #endif /* LINEMODE */ 949 950 /* 951 * Send along a couple of other options that we wish to negotiate. 952 */ 953 send_do(TELOPT_NAWS, 1); 954 send_will(TELOPT_STATUS, 1); 955 flowmode = 1; /* default flow control state */ 956 restartany = -1; /* uninitialized... */ 957 send_do(TELOPT_LFLOW, 1); 958 959 /* 960 * Spin, waiting for a response from the DO ECHO. However, 961 * some REALLY DUMB telnets out there might not respond 962 * to the DO ECHO. So, we spin looking for NAWS, (most dumb 963 * telnets so far seem to respond with WONT for a DO that 964 * they don't understand...) because by the time we get the 965 * response, it will already have processed the DO ECHO. 966 * Kludge upon kludge. 967 */ 968 while (his_will_wont_is_changing(TELOPT_NAWS)) 969 ttloop(); 970 971 /* 972 * But... 973 * The client might have sent a WILL NAWS as part of its 974 * startup code; if so, we'll be here before we get the 975 * response to the DO ECHO. We'll make the assumption 976 * that any implementation that understands about NAWS 977 * is a modern enough implementation that it will respond 978 * to our DO ECHO request; hence we'll do another spin 979 * waiting for the ECHO option to settle down, which is 980 * what we wanted to do in the first place... 981 */ 982 if (his_want_state_is_will(TELOPT_ECHO) && 983 his_state_is_will(TELOPT_NAWS)) { 984 while (his_will_wont_is_changing(TELOPT_ECHO)) 985 ttloop(); 986 } 987 /* 988 * On the off chance that the telnet client is broken and does not 989 * respond to the DO ECHO we sent, (after all, we did send the 990 * DO NAWS negotiation after the DO ECHO, and we won't get here 991 * until a response to the DO NAWS comes back) simulate the 992 * receipt of a will echo. This will also send a WONT ECHO 993 * to the client, since we assume that the client failed to 994 * respond because it believes that it is already in DO ECHO 995 * mode, which we do not want. 996 */ 997 if (his_want_state_is_will(TELOPT_ECHO)) { 998 DIAG(TD_OPTIONS, 999 {sprintf(nfrontp, "td: simulating recv\r\n"); 1000 nfrontp += strlen(nfrontp);}); 1001 willoption(TELOPT_ECHO); 1002 } 1003 1004 /* 1005 * Finally, to clean things up, we turn on our echo. This 1006 * will break stupid 4.2 telnets out of local terminal echo. 1007 */ 1008 1009 if (my_state_is_wont(TELOPT_ECHO)) 1010 send_will(TELOPT_ECHO, 1); 1011 1012 #ifndef STREAMSPTY 1013 /* 1014 * Turn on packet mode 1015 */ 1016 (void) ioctl(p, TIOCPKT, (char *)&on); 1017 #endif 1018 1019 #if defined(LINEMODE) && defined(KLUDGELINEMODE) 1020 /* 1021 * Continuing line mode support. If client does not support 1022 * real linemode, attempt to negotiate kludge linemode by sending 1023 * the do timing mark sequence. 1024 */ 1025 if (lmodetype < REAL_LINEMODE) 1026 send_do(TELOPT_TM, 1); 1027 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */ 1028 1029 /* 1030 * Call telrcv() once to pick up anything received during 1031 * terminal type negotiation, 4.2/4.3 determination, and 1032 * linemode negotiation. 1033 */ 1034 telrcv(); 1035 1036 (void) ioctl(f, FIONBIO, (char *)&on); 1037 (void) ioctl(p, FIONBIO, (char *)&on); 1038 #if defined(CRAY2) && defined(UNICOS5) 1039 init_termdriver(f, p, interrupt, sendbrk); 1040 #endif 1041 1042 #if defined(SO_OOBINLINE) 1043 (void) setsockopt(net, SOL_SOCKET, SO_OOBINLINE, 1044 (char *)&on, sizeof on); 1045 #endif /* defined(SO_OOBINLINE) */ 1046 1047 #ifdef SIGTSTP 1048 (void) signal(SIGTSTP, SIG_IGN); 1049 #endif 1050 #ifdef SIGTTOU 1051 /* 1052 * Ignoring SIGTTOU keeps the kernel from blocking us 1053 * in ttioct() in /sys/tty.c. 1054 */ 1055 (void) signal(SIGTTOU, SIG_IGN); 1056 #endif 1057 1058 (void) signal(SIGCHLD, cleanup); 1059 1060 #if defined(CRAY2) && defined(UNICOS5) 1061 /* 1062 * Cray-2 will send a signal when pty modes are changed by slave 1063 * side. Set up signal handler now. 1064 */ 1065 if ((int)signal(SIGUSR1, termstat) < 0) 1066 perror("signal"); 1067 else if (ioctl(p, TCSIGME, (char *)SIGUSR1) < 0) 1068 perror("ioctl:TCSIGME"); 1069 /* 1070 * Make processing loop check terminal characteristics early on. 1071 */ 1072 termstat(); 1073 #endif 1074 1075 #ifdef TIOCNOTTY 1076 { 1077 register int t; 1078 t = open(_PATH_TTY, O_RDWR); 1079 if (t >= 0) { 1080 (void) ioctl(t, TIOCNOTTY, (char *)0); 1081 (void) close(t); 1082 } 1083 } 1084 #endif 1085 1086 #if defined(CRAY) && defined(NEWINIT) && defined(TIOCSCTTY) 1087 (void) setsid(); 1088 ioctl(p, TIOCSCTTY, 0); 1089 #endif 1090 1091 /* 1092 * Show banner that getty never gave. 1093 * 1094 * We put the banner in the pty input buffer. This way, it 1095 * gets carriage return null processing, etc., just like all 1096 * other pty --> client data. 1097 */ 1098 1099 #if !defined(CRAY) || !defined(NEWINIT) 1100 if (getenv("USER")) 1101 hostinfo = 0; 1102 #endif 1103 1104 if (getent(defent, "default") == 1) { 1105 char *getstr(); 1106 char *cp=defstrs; 1107 1108 HE = getstr("he", &cp); 1109 HN = getstr("hn", &cp); 1110 IM = getstr("im", &cp); 1111 if (HN && *HN) 1112 (void) strcpy(host_name, HN); 1113 if (IM == 0) 1114 IM = ""; 1115 } else { 1116 IM = DEFAULT_IM; 1117 HE = 0; 1118 } 1119 edithost(HE, host_name); 1120 if (hostinfo && *IM) 1121 putf(IM, ptyibuf2); 1122 1123 if (pcc) 1124 (void) strncat(ptyibuf2, ptyip, pcc+1); 1125 ptyip = ptyibuf2; 1126 pcc = strlen(ptyip); 1127 #ifdef LINEMODE 1128 /* 1129 * Last check to make sure all our states are correct. 1130 */ 1131 init_termbuf(); 1132 localstat(); 1133 #endif /* LINEMODE */ 1134 1135 DIAG(TD_REPORT, 1136 {sprintf(nfrontp, "td: Entering processing loop\r\n"); 1137 nfrontp += strlen(nfrontp);}); 1138 1139 #ifdef convex 1140 startslave(host); 1141 #endif 1142 1143 nfd = ((f > p) ? f : p) + 1; 1144 for (;;) { 1145 fd_set ibits, obits, xbits; 1146 register int c; 1147 1148 if (ncc < 0 && pcc < 0) 1149 break; 1150 1151 #if defined(CRAY2) && defined(UNICOS5) 1152 if (needtermstat) 1153 _termstat(); 1154 #endif /* defined(CRAY2) && defined(UNICOS5) */ 1155 FD_ZERO(&ibits); 1156 FD_ZERO(&obits); 1157 FD_ZERO(&xbits); 1158 /* 1159 * Never look for input if there's still 1160 * stuff in the corresponding output buffer 1161 */ 1162 if (nfrontp - nbackp || pcc > 0) { 1163 FD_SET(f, &obits); 1164 } else { 1165 FD_SET(p, &ibits); 1166 } 1167 if (pfrontp - pbackp || ncc > 0) { 1168 FD_SET(p, &obits); 1169 } else { 1170 FD_SET(f, &ibits); 1171 } 1172 if (!SYNCHing) { 1173 FD_SET(f, &xbits); 1174 } 1175 if ((c = select(nfd, &ibits, &obits, &xbits, 1176 (struct timeval *)0)) < 1) { 1177 if (c == -1) { 1178 if (errno == EINTR) { 1179 continue; 1180 } 1181 } 1182 sleep(5); 1183 continue; 1184 } 1185 1186 /* 1187 * Any urgent data? 1188 */ 1189 if (FD_ISSET(net, &xbits)) { 1190 SYNCHing = 1; 1191 } 1192 1193 /* 1194 * Something to read from the network... 1195 */ 1196 if (FD_ISSET(net, &ibits)) { 1197 #if !defined(SO_OOBINLINE) 1198 /* 1199 * In 4.2 (and 4.3 beta) systems, the 1200 * OOB indication and data handling in the kernel 1201 * is such that if two separate TCP Urgent requests 1202 * come in, one byte of TCP data will be overlaid. 1203 * This is fatal for Telnet, but we try to live 1204 * with it. 1205 * 1206 * In addition, in 4.2 (and...), a special protocol 1207 * is needed to pick up the TCP Urgent data in 1208 * the correct sequence. 1209 * 1210 * What we do is: if we think we are in urgent 1211 * mode, we look to see if we are "at the mark". 1212 * If we are, we do an OOB receive. If we run 1213 * this twice, we will do the OOB receive twice, 1214 * but the second will fail, since the second 1215 * time we were "at the mark", but there wasn't 1216 * any data there (the kernel doesn't reset 1217 * "at the mark" until we do a normal read). 1218 * Once we've read the OOB data, we go ahead 1219 * and do normal reads. 1220 * 1221 * There is also another problem, which is that 1222 * since the OOB byte we read doesn't put us 1223 * out of OOB state, and since that byte is most 1224 * likely the TELNET DM (data mark), we would 1225 * stay in the TELNET SYNCH (SYNCHing) state. 1226 * So, clocks to the rescue. If we've "just" 1227 * received a DM, then we test for the 1228 * presence of OOB data when the receive OOB 1229 * fails (and AFTER we did the normal mode read 1230 * to clear "at the mark"). 1231 */ 1232 if (SYNCHing) { 1233 int atmark; 1234 1235 (void) ioctl(net, SIOCATMARK, (char *)&atmark); 1236 if (atmark) { 1237 ncc = recv(net, netibuf, sizeof (netibuf), MSG_OOB); 1238 if ((ncc == -1) && (errno == EINVAL)) { 1239 ncc = read(net, netibuf, sizeof (netibuf)); 1240 if (sequenceIs(didnetreceive, gotDM)) { 1241 SYNCHing = stilloob(net); 1242 } 1243 } 1244 } else { 1245 ncc = read(net, netibuf, sizeof (netibuf)); 1246 } 1247 } else { 1248 ncc = read(net, netibuf, sizeof (netibuf)); 1249 } 1250 settimer(didnetreceive); 1251 #else /* !defined(SO_OOBINLINE)) */ 1252 ncc = read(net, netibuf, sizeof (netibuf)); 1253 #endif /* !defined(SO_OOBINLINE)) */ 1254 if (ncc < 0 && errno == EWOULDBLOCK) 1255 ncc = 0; 1256 else { 1257 if (ncc <= 0) { 1258 break; 1259 } 1260 netip = netibuf; 1261 } 1262 DIAG((TD_REPORT | TD_NETDATA), 1263 {sprintf(nfrontp, "td: netread %d chars\r\n", ncc); 1264 nfrontp += strlen(nfrontp);}); 1265 DIAG(TD_NETDATA, printdata("nd", netip, ncc)); 1266 } 1267 1268 /* 1269 * Something to read from the pty... 1270 */ 1271 if (FD_ISSET(p, &ibits)) { 1272 #ifndef STREAMSPTY 1273 pcc = read(p, ptyibuf, BUFSIZ); 1274 #else 1275 pcc = readstream(p, ptyibuf, BUFSIZ); 1276 #endif 1277 /* 1278 * On some systems, if we try to read something 1279 * off the master side before the slave side is 1280 * opened, we get EIO. 1281 */ 1282 if (pcc < 0 && (errno == EWOULDBLOCK || 1283 #ifdef EAGAIN 1284 errno == EAGAIN || 1285 #endif 1286 errno == EIO)) { 1287 pcc = 0; 1288 } else { 1289 if (pcc <= 0) 1290 break; 1291 #if !defined(CRAY2) || !defined(UNICOS5) 1292 #ifdef LINEMODE 1293 /* 1294 * If ioctl from pty, pass it through net 1295 */ 1296 if (ptyibuf[0] & TIOCPKT_IOCTL) { 1297 copy_termbuf(ptyibuf+1, pcc-1); 1298 localstat(); 1299 pcc = 1; 1300 } 1301 #endif /* LINEMODE */ 1302 if (ptyibuf[0] & TIOCPKT_FLUSHWRITE) { 1303 netclear(); /* clear buffer back */ 1304 #ifndef NO_URGENT 1305 /* 1306 * There are client telnets on some 1307 * operating systems get screwed up 1308 * royally if we send them urgent 1309 * mode data. 1310 */ 1311 *nfrontp++ = IAC; 1312 *nfrontp++ = DM; 1313 neturg = nfrontp-1; /* off by one XXX */ 1314 DIAG(TD_OPTIONS, 1315 printoption("td: send IAC", DM)); 1316 1317 #endif 1318 } 1319 if (his_state_is_will(TELOPT_LFLOW) && 1320 (ptyibuf[0] & 1321 (TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) { 1322 int newflow = 1323 ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0; 1324 if (newflow != flowmode) { 1325 flowmode = newflow; 1326 (void) sprintf(nfrontp, 1327 "%c%c%c%c%c%c", 1328 IAC, SB, TELOPT_LFLOW, 1329 flowmode ? LFLOW_ON 1330 : LFLOW_OFF, 1331 IAC, SE); 1332 nfrontp += 6; 1333 DIAG(TD_OPTIONS, printsub('>', 1334 (unsigned char *)nfrontp-4, 1335 4);); 1336 } 1337 } 1338 pcc--; 1339 ptyip = ptyibuf+1; 1340 #else /* defined(CRAY2) && defined(UNICOS5) */ 1341 if (!uselinemode) { 1342 unpcc = pcc; 1343 unptyip = ptyibuf; 1344 pcc = term_output(&unptyip, ptyibuf2, 1345 &unpcc, BUFSIZ); 1346 ptyip = ptyibuf2; 1347 } else 1348 ptyip = ptyibuf; 1349 #endif /* defined(CRAY2) && defined(UNICOS5) */ 1350 } 1351 } 1352 1353 while (pcc > 0) { 1354 if ((&netobuf[BUFSIZ] - nfrontp) < 2) 1355 break; 1356 c = *ptyip++ & 0377, pcc--; 1357 if (c == IAC) 1358 *nfrontp++ = c; 1359 #if defined(CRAY2) && defined(UNICOS5) 1360 else if (c == '\n' && 1361 my_state_is_wont(TELOPT_BINARY) && newmap) 1362 *nfrontp++ = '\r'; 1363 #endif /* defined(CRAY2) && defined(UNICOS5) */ 1364 *nfrontp++ = c; 1365 if ((c == '\r') && (my_state_is_wont(TELOPT_BINARY))) { 1366 if (pcc > 0 && ((*ptyip & 0377) == '\n')) { 1367 *nfrontp++ = *ptyip++ & 0377; 1368 pcc--; 1369 } else 1370 *nfrontp++ = '\0'; 1371 } 1372 } 1373 #if defined(CRAY2) && defined(UNICOS5) 1374 /* 1375 * If chars were left over from the terminal driver, 1376 * note their existence. 1377 */ 1378 if (!uselinemode && unpcc) { 1379 pcc = unpcc; 1380 unpcc = 0; 1381 ptyip = unptyip; 1382 } 1383 #endif /* defined(CRAY2) && defined(UNICOS5) */ 1384 1385 if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0) 1386 netflush(); 1387 if (ncc > 0) 1388 telrcv(); 1389 if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0) 1390 ptyflush(); 1391 } 1392 cleanup(0); 1393 } /* end of telnet */ 1394 1395 #ifndef TCSIG 1396 # ifdef TIOCSIG 1397 # define TCSIG TIOCSIG 1398 # endif 1399 #endif 1400 1401 #ifdef STREAMSPTY 1402 1403 int flowison = -1; /* current state of flow: -1 is unknown */ 1404 1405 int readstream(p, ibuf, bufsize) 1406 int p; 1407 char *ibuf; 1408 int bufsize; 1409 { 1410 int flags = 0; 1411 int ret = 0; 1412 struct termios *tsp; 1413 struct termio *tp; 1414 struct iocblk *ip; 1415 char vstop, vstart; 1416 int ixon; 1417 int newflow; 1418 1419 strbufc.maxlen = BUFSIZ; 1420 strbufc.buf = (char *)ctlbuf; 1421 strbufd.maxlen = bufsize-1; 1422 strbufd.len = 0; 1423 strbufd.buf = ibuf+1; 1424 ibuf[0] = 0; 1425 1426 ret = getmsg(p, &strbufc, &strbufd, &flags); 1427 if (ret < 0) /* error of some sort -- probably EAGAIN */ 1428 return(-1); 1429 1430 if (strbufc.len <= 0 || ctlbuf[0] == M_DATA) { 1431 /* data message */ 1432 if (strbufd.len > 0) { /* real data */ 1433 return(strbufd.len + 1); /* count header char */ 1434 } else { 1435 /* nothing there */ 1436 errno = EAGAIN; 1437 return(-1); 1438 } 1439 } 1440 1441 /* 1442 * It's a control message. Return 1, to look at the flag we set 1443 */ 1444 1445 switch (ctlbuf[0]) { 1446 case M_FLUSH: 1447 if (ibuf[1] & FLUSHW) 1448 ibuf[0] = TIOCPKT_FLUSHWRITE; 1449 return(1); 1450 1451 case M_IOCTL: 1452 ip = (struct iocblk *) (ibuf+1); 1453 1454 switch (ip->ioc_cmd) { 1455 case TCSETS: 1456 case TCSETSW: 1457 case TCSETSF: 1458 tsp = (struct termios *) 1459 (ibuf+1 + sizeof(struct iocblk)); 1460 vstop = tsp->c_cc[VSTOP]; 1461 vstart = tsp->c_cc[VSTART]; 1462 ixon = tsp->c_iflag & IXON; 1463 break; 1464 case TCSETA: 1465 case TCSETAW: 1466 case TCSETAF: 1467 tp = (struct termio *) (ibuf+1 + sizeof(struct iocblk)); 1468 vstop = tp->c_cc[VSTOP]; 1469 vstart = tp->c_cc[VSTART]; 1470 ixon = tp->c_iflag & IXON; 1471 break; 1472 default: 1473 errno = EAGAIN; 1474 return(-1); 1475 } 1476 1477 newflow = (ixon && (vstart == 021) && (vstop == 023)) ? 1 : 0; 1478 if (newflow != flowison) { /* it's a change */ 1479 flowison = newflow; 1480 ibuf[0] = newflow ? TIOCPKT_DOSTOP : TIOCPKT_NOSTOP; 1481 return(1); 1482 } 1483 } 1484 1485 /* nothing worth doing anything about */ 1486 errno = EAGAIN; 1487 return(-1); 1488 } 1489 #endif /* STREAMSPTY */ 1490 1491 /* 1492 * Send interrupt to process on other side of pty. 1493 * If it is in raw mode, just write NULL; 1494 * otherwise, write intr char. 1495 */ 1496 void 1497 interrupt() 1498 { 1499 ptyflush(); /* half-hearted */ 1500 1501 #if defined(STREAMSPTY) && defined(TIOCSIGNAL) 1502 /* Streams PTY style ioctl to post a signal */ 1503 { 1504 int sig = SIGINT; 1505 (void) ioctl(pty, TIOCSIGNAL, &sig); 1506 (void) ioctl(pty, I_FLUSH, FLUSHR); 1507 } 1508 #else 1509 #ifdef TCSIG 1510 (void) ioctl(pty, TCSIG, (char *)SIGINT); 1511 #else /* TCSIG */ 1512 init_termbuf(); 1513 *pfrontp++ = slctab[SLC_IP].sptr ? 1514 (unsigned char)*slctab[SLC_IP].sptr : '\177'; 1515 #endif /* TCSIG */ 1516 #endif 1517 } 1518 1519 /* 1520 * Send quit to process on other side of pty. 1521 * If it is in raw mode, just write NULL; 1522 * otherwise, write quit char. 1523 */ 1524 void 1525 sendbrk() 1526 { 1527 ptyflush(); /* half-hearted */ 1528 #ifdef TCSIG 1529 (void) ioctl(pty, TCSIG, (char *)SIGQUIT); 1530 #else /* TCSIG */ 1531 init_termbuf(); 1532 *pfrontp++ = slctab[SLC_ABORT].sptr ? 1533 (unsigned char)*slctab[SLC_ABORT].sptr : '\034'; 1534 #endif /* TCSIG */ 1535 } 1536 1537 void 1538 sendsusp() 1539 { 1540 #ifdef SIGTSTP 1541 ptyflush(); /* half-hearted */ 1542 # ifdef TCSIG 1543 (void) ioctl(pty, TCSIG, (char *)SIGTSTP); 1544 # else /* TCSIG */ 1545 *pfrontp++ = slctab[SLC_SUSP].sptr ? 1546 (unsigned char)*slctab[SLC_SUSP].sptr : '\032'; 1547 # endif /* TCSIG */ 1548 #endif /* SIGTSTP */ 1549 } 1550 1551 /* 1552 * When we get an AYT, if ^T is enabled, use that. Otherwise, 1553 * just send back "[Yes]". 1554 */ 1555 void 1556 recv_ayt() 1557 { 1558 #if defined(SIGINFO) && defined(TCSIG) 1559 if (slctab[SLC_AYT].sptr && *slctab[SLC_AYT].sptr != _POSIX_VDISABLE) { 1560 (void) ioctl(pty, TCSIG, (char *)SIGINFO); 1561 return; 1562 } 1563 #endif 1564 (void) strcpy(nfrontp, "\r\n[Yes]\r\n"); 1565 nfrontp += 9; 1566 } 1567 1568 void 1569 doeof() 1570 { 1571 init_termbuf(); 1572 1573 #if defined(LINEMODE) && defined(USE_TERMIO) && (VEOF == VMIN) 1574 if (!tty_isediting()) { 1575 extern char oldeofc; 1576 *pfrontp++ = oldeofc; 1577 return; 1578 } 1579 #endif 1580 *pfrontp++ = slctab[SLC_EOF].sptr ? 1581 (unsigned char)*slctab[SLC_EOF].sptr : '\004'; 1582 } 1583