telnetd.c revision 1.20
1 /* $NetBSD: telnetd.c,v 1.20 2000/01/13 13:11:31 ad Exp $ */ 2 3 /* 4 * Copyright (C) 1997 and 1998 WIDE Project. 5 * 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 project 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 PROJECT 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 PROJECT 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 /* 33 * Copyright (c) 1989, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. All advertising materials mentioning features or use of this software 45 * must display the following acknowledgement: 46 * This product includes software developed by the University of 47 * California, Berkeley and its contributors. 48 * 4. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 */ 64 65 #include <sys/cdefs.h> 66 #ifndef lint 67 __COPYRIGHT("@(#) Copyright (c) 1989, 1993\n\ 68 The Regents of the University of California. All rights reserved.\n"); 69 #if 0 70 static char sccsid[] = "@(#)telnetd.c 8.4 (Berkeley) 5/30/95"; 71 #else 72 __RCSID("$NetBSD: telnetd.c,v 1.20 2000/01/13 13:11:31 ad Exp $"); 73 #endif 74 #endif /* not lint */ 75 76 #include "telnetd.h" 77 #include "pathnames.h" 78 79 #include <arpa/inet.h> 80 81 #include <err.h> 82 #include <termcap.h> 83 84 #include <limits.h> 85 86 #define P __P 87 88 #if defined(_SC_CRAY_SECURE_SYS) && !defined(SCM_SECURITY) 89 /* 90 * UNICOS 6.0/6.1 do not have SCM_SECURITY defined, so we can 91 * use it to tell us to turn off all the socket security code, 92 * since that is only used in UNICOS 7.0 and later. 93 */ 94 # undef _SC_CRAY_SECURE_SYS 95 #endif 96 97 #if defined(_SC_CRAY_SECURE_SYS) 98 #include <sys/sysv.h> 99 #include <sys/secdev.h> 100 # ifdef SO_SEC_MULTI /* 8.0 code */ 101 #include <sys/secparm.h> 102 #include <sys/usrv.h> 103 # endif /* SO_SEC_MULTI */ 104 int secflag; 105 char tty_dev[16]; 106 struct secdev dv; 107 struct sysv sysv; 108 # ifdef SO_SEC_MULTI /* 8.0 code */ 109 struct socksec ss; 110 # else /* SO_SEC_MULTI */ /* 7.0 code */ 111 struct socket_security ss; 112 # endif /* SO_SEC_MULTI */ 113 #endif /* _SC_CRAY_SECURE_SYS */ 114 115 #if defined(AUTHENTICATION) 116 #include <libtelnet/auth.h> 117 int auth_level = 0; 118 #endif 119 #if defined(SECURELOGIN) 120 int require_secure_login = 0; 121 #endif 122 123 extern int utmp_len; 124 int registerd_host_only = 0; 125 126 #ifdef STREAMSPTY 127 # include <stropts.h> 128 # include <termio.h> 129 /* make sure we don't get the bsd version */ 130 # include "/usr/include/sys/tty.h" 131 # include <sys/ptyvar.h> 132 133 /* 134 * Because of the way ptyibuf is used with streams messages, we need 135 * ptyibuf+1 to be on a full-word boundary. The following wierdness 136 * is simply to make that happen. 137 */ 138 long ptyibufbuf[BUFSIZ/sizeof(long)+1]; 139 char *ptyibuf = ((char *)&ptyibufbuf[1])-1; 140 char *ptyip = ((char *)&ptyibufbuf[1])-1; 141 char ptyibuf2[BUFSIZ*4]; 142 unsigned char ctlbuf[BUFSIZ]; 143 struct strbuf strbufc, strbufd; 144 145 int readstream(); 146 147 #else /* ! STREAMPTY */ 148 149 /* 150 * I/O data buffers, 151 * pointers, and counters. 152 */ 153 char ptyibuf[BUFSIZ], *ptyip = ptyibuf; 154 char ptyibuf2[BUFSIZ]; 155 156 #endif /* ! STREAMPTY */ 157 158 int hostinfo = 1; /* do we print login banner? */ 159 160 #ifdef CRAY 161 extern int newmap; /* nonzero if \n maps to ^M^J */ 162 int lowpty = 0, highpty; /* low, high pty numbers */ 163 #endif /* CRAY */ 164 165 int debug = 0; 166 int keepalive = 1; 167 char *gettyname = "default"; 168 char *progname; 169 170 extern void usage P((void)); 171 int main __P((int, char *[])); 172 void usage __P((void)); 173 int getterminaltype __P((char *)); 174 int getent __P((char *, char *)); 175 void doit __P((struct sockaddr *)); 176 void _gettermname __P((void)); 177 int terminaltypeok __P((char *)); 178 char *getstr __P((char *, char **)); 179 180 /* 181 * The string to pass to getopt(). We do it this way so 182 * that only the actual options that we support will be 183 * passed off to getopt(). 184 */ 185 char valid_opts[] = { 186 'd', ':', 'g', ':', 'h', 'k', 'n', 'S', ':', 'u', ':', 'U', 187 '4', '6', 188 #ifdef AUTHENTICATION 189 'a', ':', 'X', ':', 190 #endif 191 #ifdef BFTPDAEMON 192 'B', 193 #endif 194 #ifdef DIAGNOSTICS 195 'D', ':', 196 #endif 197 #if defined(CRAY) && defined(NEWINIT) 198 'I', ':', 199 #endif 200 #ifdef LINEMODE 201 'l', 202 #endif 203 #ifdef CRAY 204 'r', ':', 205 #endif 206 #ifdef SECURELOGIN 207 's', 208 #endif 209 '\0' 210 }; 211 212 int family = AF_INET; 213 214 int 215 main(argc, argv) 216 int argc; 217 char *argv[]; 218 { 219 struct sockaddr_storage from; 220 int on = 1, fromlen; 221 register int ch; 222 #if defined(IPPROTO_IP) && defined(IP_TOS) 223 int tos = -1; 224 #endif 225 226 pfrontp = pbackp = ptyobuf; 227 netip = netibuf; 228 nfrontp = nbackp = netobuf; 229 230 progname = *argv; 231 232 #ifdef CRAY 233 /* 234 * Get number of pty's before trying to process options, 235 * which may include changing pty range. 236 */ 237 highpty = getnpty(); 238 #endif /* CRAY */ 239 240 while ((ch = getopt(argc, argv, valid_opts)) != -1) { 241 switch (ch) { 242 243 #ifdef AUTHENTICATION 244 case 'a': 245 /* 246 * Check for required authentication level 247 */ 248 if (strcmp(optarg, "debug") == 0) { 249 extern int auth_debug_mode; 250 auth_debug_mode = 1; 251 } else if (strcasecmp(optarg, "none") == 0) { 252 auth_level = 0; 253 } else if (strcasecmp(optarg, "other") == 0) { 254 auth_level = AUTH_OTHER; 255 } else if (strcasecmp(optarg, "user") == 0) { 256 auth_level = AUTH_USER; 257 } else if (strcasecmp(optarg, "valid") == 0) { 258 auth_level = AUTH_VALID; 259 } else if (strcasecmp(optarg, "off") == 0) { 260 /* 261 * This hack turns off authentication 262 */ 263 auth_level = -1; 264 } else { 265 fprintf(stderr, 266 "telnetd: unknown authorization level for -a\n"); 267 } 268 break; 269 #endif /* AUTHENTICATION */ 270 271 #ifdef BFTPDAEMON 272 case 'B': 273 bftpd++; 274 break; 275 #endif /* BFTPDAEMON */ 276 277 case 'd': 278 if (strcmp(optarg, "ebug") == 0) { 279 debug++; 280 break; 281 } 282 usage(); 283 /* NOTREACHED */ 284 break; 285 286 #ifdef DIAGNOSTICS 287 case 'D': 288 /* 289 * Check for desired diagnostics capabilities. 290 */ 291 if (!strcmp(optarg, "report")) { 292 diagnostic |= TD_REPORT|TD_OPTIONS; 293 } else if (!strcmp(optarg, "exercise")) { 294 diagnostic |= TD_EXERCISE; 295 } else if (!strcmp(optarg, "netdata")) { 296 diagnostic |= TD_NETDATA; 297 } else if (!strcmp(optarg, "ptydata")) { 298 diagnostic |= TD_PTYDATA; 299 } else if (!strcmp(optarg, "options")) { 300 diagnostic |= TD_OPTIONS; 301 } else { 302 usage(); 303 /* NOT REACHED */ 304 } 305 break; 306 #endif /* DIAGNOSTICS */ 307 308 case 'g': 309 gettyname = optarg; 310 break; 311 312 case 'h': 313 hostinfo = 0; 314 break; 315 316 #if defined(CRAY) && defined(NEWINIT) 317 case 'I': 318 { 319 extern char *gen_id; 320 gen_id = optarg; 321 break; 322 } 323 #endif /* defined(CRAY) && defined(NEWINIT) */ 324 325 #ifdef LINEMODE 326 case 'l': 327 alwayslinemode = 1; 328 break; 329 #endif /* LINEMODE */ 330 331 case 'k': 332 #if defined(LINEMODE) && defined(KLUDGELINEMODE) 333 lmodetype = NO_AUTOKLUDGE; 334 #else 335 /* ignore -k option if built without kludge linemode */ 336 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */ 337 break; 338 339 case 'n': 340 keepalive = 0; 341 break; 342 343 #ifdef CRAY 344 case 'r': 345 { 346 char *strchr(); 347 char *c; 348 349 /* 350 * Allow the specification of alterations 351 * to the pty search range. It is legal to 352 * specify only one, and not change the 353 * other from its default. 354 */ 355 c = strchr(optarg, '-'); 356 if (c) { 357 *c++ = '\0'; 358 highpty = atoi(c); 359 } 360 if (*optarg != '\0') 361 lowpty = atoi(optarg); 362 if ((lowpty > highpty) || (lowpty < 0) || 363 (highpty > 32767)) { 364 usage(); 365 /* NOT REACHED */ 366 } 367 break; 368 } 369 #endif /* CRAY */ 370 371 #ifdef SECURELOGIN 372 case 's': 373 /* Secure login required */ 374 require_secure_login = 1; 375 break; 376 #endif /* SECURELOGIN */ 377 case 'S': 378 #ifdef HAS_GETTOS 379 if ((tos = parsetos(optarg, "tcp")) < 0) 380 fprintf(stderr, "%s%s%s\n", 381 "telnetd: Bad TOS argument '", optarg, 382 "'; will try to use default TOS"); 383 #else 384 fprintf(stderr, "%s%s\n", "TOS option unavailable; ", 385 "-S flag not supported\n"); 386 #endif 387 break; 388 389 case 'u': 390 utmp_len = atoi(optarg); 391 break; 392 393 case 'U': 394 registerd_host_only = 1; 395 break; 396 397 #ifdef AUTHENTICATION 398 case 'X': 399 /* 400 * Check for invalid authentication types 401 */ 402 auth_disable_name(optarg); 403 break; 404 #endif /* AUTHENTICATION */ 405 406 case '4': 407 family = AF_INET; 408 break; 409 410 case '6': 411 family = AF_INET6; 412 break; 413 414 default: 415 fprintf(stderr, "telnetd: %c: unknown option\n", ch); 416 /* FALLTHROUGH */ 417 case '?': 418 usage(); 419 /* NOTREACHED */ 420 } 421 } 422 423 argc -= optind; 424 argv += optind; 425 426 if (debug) { 427 int s, ns, foo, error; 428 char *service = "telnet"; 429 struct addrinfo hints, *res; 430 431 if (argc > 1) { 432 usage(); 433 /* NOT REACHED */ 434 } else if (argc == 1) 435 service = *argv; 436 437 memset(&hints, 0, sizeof(hints)); 438 hints.ai_flags = AI_PASSIVE; 439 hints.ai_family = family; 440 hints.ai_socktype = SOCK_STREAM; 441 hints.ai_protocol = 0; 442 error = getaddrinfo(NULL, service, &hints, &res); 443 444 if (error) { 445 errx(1, "tcp/%s: %s\n", service, gai_strerror(error)); 446 usage(); 447 } 448 449 s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); 450 if (s < 0) { 451 perror("telnetd: socket");; 452 exit(1); 453 } 454 (void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 455 (char *)&on, sizeof(on)); 456 if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { 457 perror("bind"); 458 exit(1); 459 } 460 if (listen(s, 1) < 0) { 461 perror("listen"); 462 exit(1); 463 } 464 foo = res->ai_addrlen; 465 ns = accept(s, res->ai_addr, &foo); 466 if (ns < 0) { 467 perror("accept"); 468 exit(1); 469 } 470 (void) dup2(ns, 0); 471 (void) close(ns); 472 (void) close(s); 473 #ifdef convex 474 } else if (argc == 1) { 475 ; /* VOID*/ /* Just ignore the host/port name */ 476 #endif 477 } else if (argc > 0) { 478 usage(); 479 /* NOT REACHED */ 480 } 481 482 #if defined(_SC_CRAY_SECURE_SYS) 483 secflag = sysconf(_SC_CRAY_SECURE_SYS); 484 485 /* 486 * Get socket's security label 487 */ 488 if (secflag) { 489 int szss = sizeof(ss); 490 #ifdef SO_SEC_MULTI /* 8.0 code */ 491 int sock_multi; 492 int szi = sizeof(int); 493 #endif /* SO_SEC_MULTI */ 494 495 memset((char *)&dv, 0, sizeof(dv)); 496 497 if (getsysv(&sysv, sizeof(struct sysv)) != 0) { 498 perror("getsysv"); 499 exit(1); 500 } 501 502 /* 503 * Get socket security label and set device values 504 * {security label to be set on ttyp device} 505 */ 506 #ifdef SO_SEC_MULTI /* 8.0 code */ 507 if ((getsockopt(0, SOL_SOCKET, SO_SECURITY, 508 (char *)&ss, &szss) < 0) || 509 (getsockopt(0, SOL_SOCKET, SO_SEC_MULTI, 510 (char *)&sock_multi, &szi) < 0)) { 511 perror("getsockopt"); 512 exit(1); 513 } else { 514 dv.dv_actlvl = ss.ss_actlabel.lt_level; 515 dv.dv_actcmp = ss.ss_actlabel.lt_compart; 516 if (!sock_multi) { 517 dv.dv_minlvl = dv.dv_maxlvl = dv.dv_actlvl; 518 dv.dv_valcmp = dv.dv_actcmp; 519 } else { 520 dv.dv_minlvl = ss.ss_minlabel.lt_level; 521 dv.dv_maxlvl = ss.ss_maxlabel.lt_level; 522 dv.dv_valcmp = ss.ss_maxlabel.lt_compart; 523 } 524 dv.dv_devflg = 0; 525 } 526 #else /* SO_SEC_MULTI */ /* 7.0 code */ 527 if (getsockopt(0, SOL_SOCKET, SO_SECURITY, 528 (char *)&ss, &szss) >= 0) { 529 dv.dv_actlvl = ss.ss_slevel; 530 dv.dv_actcmp = ss.ss_compart; 531 dv.dv_minlvl = ss.ss_minlvl; 532 dv.dv_maxlvl = ss.ss_maxlvl; 533 dv.dv_valcmp = ss.ss_maxcmp; 534 } 535 #endif /* SO_SEC_MULTI */ 536 } 537 #endif /* _SC_CRAY_SECURE_SYS */ 538 539 openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON); 540 fromlen = sizeof (from); 541 if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) { 542 fprintf(stderr, "%s: ", progname); 543 perror("getpeername"); 544 _exit(1); 545 } 546 if (keepalive && 547 setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, 548 (char *)&on, sizeof (on)) < 0) { 549 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 550 } 551 552 #if defined(IPPROTO_IP) && defined(IP_TOS) 553 if (((struct sockaddr *)&from)->sa_family == AF_INET) { 554 # if defined(HAS_GETTOS) 555 struct tosent *tp; 556 if (tos < 0 && (tp = gettosbyname("telnet", "tcp"))) 557 tos = tp->t_tos; 558 # endif 559 if (tos < 0) 560 tos = 020; /* Low Delay bit */ 561 if (tos 562 && (setsockopt(0, IPPROTO_IP, IP_TOS, 563 (char *)&tos, sizeof(tos)) < 0) 564 && (errno != ENOPROTOOPT) ) 565 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 566 } 567 #endif /* defined(IPPROTO_IP) && defined(IP_TOS) */ 568 569 net = 0; 570 doit((struct sockaddr *)&from); 571 /* NOTREACHED */ 572 #ifdef __GNUC__ 573 exit(0); 574 #endif 575 } /* end of main */ 576 577 void 578 usage() 579 { 580 fprintf(stderr, "Usage: telnetd"); 581 #ifdef AUTHENTICATION 582 fprintf(stderr, " [-a (debug|other|user|valid|off|none)]\n\t"); 583 #endif 584 #ifdef BFTPDAEMON 585 fprintf(stderr, " [-B]"); 586 #endif 587 fprintf(stderr, " [-debug]"); 588 #ifdef DIAGNOSTICS 589 fprintf(stderr, " [-D (options|report|exercise|netdata|ptydata)]\n\t"); 590 #endif 591 #ifdef AUTHENTICATION 592 fprintf(stderr, " [-edebug]"); 593 #endif 594 fprintf(stderr, " [-h]"); 595 #if defined(CRAY) && defined(NEWINIT) 596 fprintf(stderr, " [-Iinitid]"); 597 #endif 598 #if defined(LINEMODE) && defined(KLUDGELINEMODE) 599 fprintf(stderr, " [-k]"); 600 #endif 601 #ifdef LINEMODE 602 fprintf(stderr, " [-l]"); 603 #endif 604 fprintf(stderr, " [-n]"); 605 #ifdef CRAY 606 fprintf(stderr, " [-r[lowpty]-[highpty]]"); 607 #endif 608 fprintf(stderr, "\n\t"); 609 #ifdef SECURELOGIN 610 fprintf(stderr, " [-s]"); 611 #endif 612 #ifdef HAS_GETTOS 613 fprintf(stderr, " [-S tos]"); 614 #endif 615 #ifdef AUTHENTICATION 616 fprintf(stderr, " [-X auth-type]"); 617 #endif 618 fprintf(stderr, " [-u utmp_hostname_length] [-U]"); 619 fprintf(stderr, " [port]\n"); 620 exit(1); 621 } 622 623 /* 624 * getterminaltype 625 * 626 * Ask the other end to send along its terminal type and speed. 627 * Output is the variable terminaltype filled in. 628 */ 629 static unsigned char ttytype_sbbuf[] = { 630 IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE 631 }; 632 633 int 634 getterminaltype(name) 635 char *name; 636 { 637 int retval = -1; 638 639 settimer(baseline); 640 #if defined(AUTHENTICATION) 641 /* 642 * Handle the Authentication option before we do anything else. 643 */ 644 send_do(TELOPT_AUTHENTICATION, 1); 645 while (his_will_wont_is_changing(TELOPT_AUTHENTICATION)) 646 ttloop(); 647 if (his_state_is_will(TELOPT_AUTHENTICATION)) { 648 retval = auth_wait(name); 649 } 650 #endif 651 652 send_do(TELOPT_TTYPE, 1); 653 send_do(TELOPT_TSPEED, 1); 654 send_do(TELOPT_XDISPLOC, 1); 655 send_do(TELOPT_NEW_ENVIRON, 1); 656 send_do(TELOPT_OLD_ENVIRON, 1); 657 while ( 658 his_will_wont_is_changing(TELOPT_TTYPE) || 659 his_will_wont_is_changing(TELOPT_TSPEED) || 660 his_will_wont_is_changing(TELOPT_XDISPLOC) || 661 his_will_wont_is_changing(TELOPT_NEW_ENVIRON) || 662 his_will_wont_is_changing(TELOPT_OLD_ENVIRON)) { 663 ttloop(); 664 } 665 if (his_state_is_will(TELOPT_TSPEED)) { 666 static unsigned char sb[] = 667 { IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE }; 668 669 memmove(nfrontp, sb, sizeof sb); 670 nfrontp += sizeof sb; 671 DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); 672 } 673 if (his_state_is_will(TELOPT_XDISPLOC)) { 674 static unsigned char sb[] = 675 { IAC, SB, TELOPT_XDISPLOC, TELQUAL_SEND, IAC, SE }; 676 677 memmove(nfrontp, sb, sizeof sb); 678 nfrontp += sizeof sb; 679 DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); 680 } 681 if (his_state_is_will(TELOPT_NEW_ENVIRON)) { 682 static unsigned char sb[] = 683 { IAC, SB, TELOPT_NEW_ENVIRON, TELQUAL_SEND, IAC, SE }; 684 685 memmove(nfrontp, sb, sizeof sb); 686 nfrontp += sizeof sb; 687 DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); 688 } 689 else if (his_state_is_will(TELOPT_OLD_ENVIRON)) { 690 static unsigned char sb[] = 691 { IAC, SB, TELOPT_OLD_ENVIRON, TELQUAL_SEND, IAC, SE }; 692 693 memmove(nfrontp, sb, sizeof sb); 694 nfrontp += sizeof sb; 695 DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); 696 } 697 if (his_state_is_will(TELOPT_TTYPE)) { 698 699 memmove(nfrontp, ttytype_sbbuf, sizeof ttytype_sbbuf); 700 nfrontp += sizeof ttytype_sbbuf; 701 DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2, 702 sizeof ttytype_sbbuf - 2);); 703 } 704 if (his_state_is_will(TELOPT_TSPEED)) { 705 while (sequenceIs(tspeedsubopt, baseline)) 706 ttloop(); 707 } 708 if (his_state_is_will(TELOPT_XDISPLOC)) { 709 while (sequenceIs(xdisplocsubopt, baseline)) 710 ttloop(); 711 } 712 if (his_state_is_will(TELOPT_NEW_ENVIRON)) { 713 while (sequenceIs(environsubopt, baseline)) 714 ttloop(); 715 } 716 if (his_state_is_will(TELOPT_OLD_ENVIRON)) { 717 while (sequenceIs(oenvironsubopt, baseline)) 718 ttloop(); 719 } 720 if (his_state_is_will(TELOPT_TTYPE)) { 721 char first[256], last[256]; 722 723 while (sequenceIs(ttypesubopt, baseline)) 724 ttloop(); 725 726 /* 727 * If the other side has already disabled the option, then 728 * we have to just go with what we (might) have already gotten. 729 */ 730 if (his_state_is_will(TELOPT_TTYPE) && !terminaltypeok(terminaltype)) { 731 (void) strncpy(first, terminaltype, sizeof(first)); 732 for(;;) { 733 /* 734 * Save the unknown name, and request the next name. 735 */ 736 (void) strncpy(last, terminaltype, sizeof(last)); 737 _gettermname(); 738 if (terminaltypeok(terminaltype)) 739 break; 740 if ((strncmp(last, terminaltype, sizeof(last)) == 0) || 741 his_state_is_wont(TELOPT_TTYPE)) { 742 /* 743 * We've hit the end. If this is the same as 744 * the first name, just go with it. 745 */ 746 if (strncmp(first, terminaltype, sizeof(first)) == 0) 747 break; 748 /* 749 * Get the terminal name one more time, so that 750 * RFC1091 compliant telnets will cycle back to 751 * the start of the list. 752 */ 753 _gettermname(); 754 if (strncmp(first, terminaltype, sizeof(first)) != 0) 755 (void) strncpy(terminaltype, first, sizeof(first)); 756 break; 757 } 758 } 759 } 760 } 761 return(retval); 762 } /* end of getterminaltype */ 763 764 void 765 _gettermname() 766 { 767 /* 768 * If the client turned off the option, 769 * we can't send another request, so we 770 * just return. 771 */ 772 if (his_state_is_wont(TELOPT_TTYPE)) 773 return; 774 settimer(baseline); 775 memmove(nfrontp, ttytype_sbbuf, sizeof ttytype_sbbuf); 776 nfrontp += sizeof ttytype_sbbuf; 777 DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2, 778 sizeof ttytype_sbbuf - 2);); 779 while (sequenceIs(ttypesubopt, baseline)) 780 ttloop(); 781 } 782 783 int 784 terminaltypeok(s) 785 char *s; 786 { 787 char buf[1024]; 788 789 if (terminaltype == NULL) 790 return(1); 791 792 /* 793 * tgetent() will return 1 if the type is known, and 794 * 0 if it is not known. If it returns -1, it couldn't 795 * open the database. But if we can't open the database, 796 * it won't help to say we failed, because we won't be 797 * able to verify anything else. So, we treat -1 like 1. 798 */ 799 if (tgetent(buf, s) == 0) 800 return(0); 801 return(1); 802 } 803 804 #ifndef MAXHOSTNAMELEN 805 #define MAXHOSTNAMELEN 64 806 #endif /* MAXHOSTNAMELEN */ 807 808 char *hostname; 809 char host_name[MAXHOSTNAMELEN + 1]; 810 char remote_host_name[MAXHOSTNAMELEN + 1]; 811 812 #ifndef convex 813 extern void telnet P((int, int)); 814 #else 815 extern void telnet P((int, int, char *)); 816 #endif 817 818 /* 819 * Get a pty, scan input lines. 820 */ 821 void 822 doit(who) 823 struct sockaddr *who; 824 { 825 char *host; 826 int error; 827 int level; 828 int ptynum; 829 char user_name[256]; 830 831 /* 832 * Find an available pty to use. 833 */ 834 #ifndef convex 835 pty = getpty(&ptynum); 836 if (pty < 0) 837 fatal(net, "All network ports in use"); 838 #else 839 for (;;) { 840 char *lp; 841 extern char *line; 842 843 if ((lp = getpty()) == NULL) 844 fatal(net, "Out of ptys"); 845 846 if ((pty = open(lp, 2)) >= 0) { 847 strcpy(line,lp); 848 line[5] = 't'; 849 break; 850 } 851 } 852 #endif 853 854 #if defined(_SC_CRAY_SECURE_SYS) 855 /* 856 * set ttyp line security label 857 */ 858 if (secflag) { 859 char slave_dev[16]; 860 861 sprintf(tty_dev, "/dev/pty/%03d", ptynum); 862 if (setdevs(tty_dev, &dv) < 0) 863 fatal(net, "cannot set pty security"); 864 sprintf(slave_dev, "/dev/ttyp%03d", ptynum); 865 if (setdevs(slave_dev, &dv) < 0) 866 fatal(net, "cannot set tty security"); 867 } 868 #endif /* _SC_CRAY_SECURE_SYS */ 869 870 /* get name of connected client */ 871 error = getnameinfo(who, who->sa_len, remote_host_name, 872 sizeof(remote_host_name), NULL, 0, 0); 873 874 if (error) { 875 fatal(net, "Couldn't resolve your address into a host name.\r\n\ 876 Please contact your net administrator"); 877 #ifdef __GNUC__ 878 host = NULL; /* XXX gcc */ 879 #endif 880 } 881 882 remote_host_name[sizeof(remote_host_name)-1] = 0; 883 host = remote_host_name; 884 885 (void)gethostname(host_name, sizeof (host_name)); 886 host_name[sizeof(host_name) - 1] = '\0'; 887 hostname = host_name; 888 889 #if defined(AUTHENTICATION) 890 auth_encrypt_init(hostname, host, "TELNETD", 1); 891 #endif 892 893 init_env(); 894 /* 895 * get terminal type. 896 */ 897 *user_name = 0; 898 level = getterminaltype(user_name); 899 setenv("TERM", terminaltype ? terminaltype : "network", 1); 900 901 /* 902 * Start up the login process on the slave side of the terminal 903 */ 904 #ifndef convex 905 startslave(host, level, user_name); 906 907 #if defined(_SC_CRAY_SECURE_SYS) 908 if (secflag) { 909 if (setulvl(dv.dv_actlvl) < 0) 910 fatal(net,"cannot setulvl()"); 911 if (setucmp(dv.dv_actcmp) < 0) 912 fatal(net, "cannot setucmp()"); 913 } 914 #endif /* _SC_CRAY_SECURE_SYS */ 915 916 telnet(net, pty); /* begin server processing */ 917 #else 918 telnet(net, pty, host); 919 #endif 920 /*NOTREACHED*/ 921 } /* end of doit */ 922 923 #if defined(CRAY2) && defined(UNICOS5) && defined(UNICOS50) 924 int 925 Xterm_output(ibufp, obuf, icountp, ocount) 926 char **ibufp, *obuf; 927 int *icountp, ocount; 928 { 929 int ret; 930 ret = term_output(*ibufp, obuf, *icountp, ocount); 931 *ibufp += *icountp; 932 *icountp = 0; 933 return(ret); 934 } 935 #define term_output Xterm_output 936 #endif /* defined(CRAY2) && defined(UNICOS5) && defined(UNICOS50) */ 937 938 /* 939 * Main loop. Select from pty and network, and 940 * hand data to telnet receiver finite state machine. 941 */ 942 void 943 #ifndef convex 944 telnet(f, p) 945 #else 946 telnet(f, p, host) 947 #endif 948 int f, p; 949 #ifdef convex 950 char *host; 951 #endif 952 { 953 int on = 1; 954 #define TABBUFSIZ 512 955 char defent[TABBUFSIZ]; 956 char defstrs[TABBUFSIZ]; 957 #undef TABBUFSIZ 958 char *HE, *HN, *IM, *IF, *ptyibuf2ptr; 959 int nfd; 960 961 /* 962 * Initialize the slc mapping table. 963 */ 964 get_slc_defaults(); 965 966 /* 967 * Do some tests where it is desireable to wait for a response. 968 * Rather than doing them slowly, one at a time, do them all 969 * at once. 970 */ 971 if (my_state_is_wont(TELOPT_SGA)) 972 send_will(TELOPT_SGA, 1); 973 /* 974 * Is the client side a 4.2 (NOT 4.3) system? We need to know this 975 * because 4.2 clients are unable to deal with TCP urgent data. 976 * 977 * To find out, we send out a "DO ECHO". If the remote system 978 * answers "WILL ECHO" it is probably a 4.2 client, and we note 979 * that fact ("WILL ECHO" ==> that the client will echo what 980 * WE, the server, sends it; it does NOT mean that the client will 981 * echo the terminal input). 982 */ 983 send_do(TELOPT_ECHO, 1); 984 985 #ifdef LINEMODE 986 if (his_state_is_wont(TELOPT_LINEMODE)) { 987 /* Query the peer for linemode support by trying to negotiate 988 * the linemode option. 989 */ 990 linemode = 0; 991 editmode = 0; 992 send_do(TELOPT_LINEMODE, 1); /* send do linemode */ 993 } 994 #endif /* LINEMODE */ 995 996 /* 997 * Send along a couple of other options that we wish to negotiate. 998 */ 999 send_do(TELOPT_NAWS, 1); 1000 send_will(TELOPT_STATUS, 1); 1001 flowmode = 1; /* default flow control state */ 1002 restartany = -1; /* uninitialized... */ 1003 send_do(TELOPT_LFLOW, 1); 1004 1005 /* 1006 * Spin, waiting for a response from the DO ECHO. However, 1007 * some REALLY DUMB telnets out there might not respond 1008 * to the DO ECHO. So, we spin looking for NAWS, (most dumb 1009 * telnets so far seem to respond with WONT for a DO that 1010 * they don't understand...) because by the time we get the 1011 * response, it will already have processed the DO ECHO. 1012 * Kludge upon kludge. 1013 */ 1014 while (his_will_wont_is_changing(TELOPT_NAWS)) 1015 ttloop(); 1016 1017 /* 1018 * But... 1019 * The client might have sent a WILL NAWS as part of its 1020 * startup code; if so, we'll be here before we get the 1021 * response to the DO ECHO. We'll make the assumption 1022 * that any implementation that understands about NAWS 1023 * is a modern enough implementation that it will respond 1024 * to our DO ECHO request; hence we'll do another spin 1025 * waiting for the ECHO option to settle down, which is 1026 * what we wanted to do in the first place... 1027 */ 1028 if (his_want_state_is_will(TELOPT_ECHO) && 1029 his_state_is_will(TELOPT_NAWS)) { 1030 while (his_will_wont_is_changing(TELOPT_ECHO)) 1031 ttloop(); 1032 } 1033 /* 1034 * On the off chance that the telnet client is broken and does not 1035 * respond to the DO ECHO we sent, (after all, we did send the 1036 * DO NAWS negotiation after the DO ECHO, and we won't get here 1037 * until a response to the DO NAWS comes back) simulate the 1038 * receipt of a will echo. This will also send a WONT ECHO 1039 * to the client, since we assume that the client failed to 1040 * respond because it believes that it is already in DO ECHO 1041 * mode, which we do not want. 1042 */ 1043 if (his_want_state_is_will(TELOPT_ECHO)) { 1044 DIAG(TD_OPTIONS, 1045 {sprintf(nfrontp, "td: simulating recv\r\n"); 1046 nfrontp += strlen(nfrontp);}); 1047 willoption(TELOPT_ECHO); 1048 } 1049 1050 /* 1051 * Finally, to clean things up, we turn on our echo. This 1052 * will break stupid 4.2 telnets out of local terminal echo. 1053 */ 1054 1055 if (my_state_is_wont(TELOPT_ECHO)) 1056 send_will(TELOPT_ECHO, 1); 1057 1058 #ifndef STREAMSPTY 1059 /* 1060 * Turn on packet mode 1061 */ 1062 (void) ioctl(p, TIOCPKT, (char *)&on); 1063 #endif 1064 1065 #if defined(LINEMODE) && defined(KLUDGELINEMODE) 1066 /* 1067 * Continuing line mode support. If client does not support 1068 * real linemode, attempt to negotiate kludge linemode by sending 1069 * the do timing mark sequence. 1070 */ 1071 if (lmodetype < REAL_LINEMODE) 1072 send_do(TELOPT_TM, 1); 1073 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */ 1074 1075 /* 1076 * Call telrcv() once to pick up anything received during 1077 * terminal type negotiation, 4.2/4.3 determination, and 1078 * linemode negotiation. 1079 */ 1080 telrcv(); 1081 1082 (void) ioctl(f, FIONBIO, (char *)&on); 1083 (void) ioctl(p, FIONBIO, (char *)&on); 1084 #if defined(CRAY2) && defined(UNICOS5) 1085 init_termdriver(f, p, interrupt, sendbrk); 1086 #endif 1087 1088 #if defined(SO_OOBINLINE) 1089 (void) setsockopt(net, SOL_SOCKET, SO_OOBINLINE, 1090 (char *)&on, sizeof on); 1091 #endif /* defined(SO_OOBINLINE) */ 1092 1093 #ifdef SIGTSTP 1094 (void) signal(SIGTSTP, SIG_IGN); 1095 #endif 1096 #ifdef SIGTTOU 1097 /* 1098 * Ignoring SIGTTOU keeps the kernel from blocking us 1099 * in ttioct() in /sys/tty.c. 1100 */ 1101 (void) signal(SIGTTOU, SIG_IGN); 1102 #endif 1103 1104 (void) signal(SIGCHLD, cleanup); 1105 1106 #if defined(CRAY2) && defined(UNICOS5) 1107 /* 1108 * Cray-2 will send a signal when pty modes are changed by slave 1109 * side. Set up signal handler now. 1110 */ 1111 if ((int)signal(SIGUSR1, termstat) < 0) 1112 perror("signal"); 1113 else if (ioctl(p, TCSIGME, (char *)SIGUSR1) < 0) 1114 perror("ioctl:TCSIGME"); 1115 /* 1116 * Make processing loop check terminal characteristics early on. 1117 */ 1118 termstat(); 1119 #endif 1120 1121 #ifdef TIOCNOTTY 1122 { 1123 register int t; 1124 t = open(_PATH_TTY, O_RDWR); 1125 if (t >= 0) { 1126 (void) ioctl(t, TIOCNOTTY, (char *)0); 1127 (void) close(t); 1128 } 1129 } 1130 #endif 1131 1132 #if defined(CRAY) && defined(NEWINIT) && defined(TIOCSCTTY) 1133 (void) setsid(); 1134 ioctl(p, TIOCSCTTY, 0); 1135 #endif 1136 1137 /* 1138 * Show banner that getty never gave. 1139 * 1140 * We put the banner in the pty input buffer. This way, it 1141 * gets carriage return null processing, etc., just like all 1142 * other pty --> client data. 1143 */ 1144 1145 #if !defined(CRAY) || !defined(NEWINIT) 1146 if (getenv("USER")) 1147 hostinfo = 0; 1148 #endif 1149 1150 if (getent(defent, gettyname) == 1) { 1151 char *cp=defstrs; 1152 1153 HE = getstr("he", &cp); 1154 HN = getstr("hn", &cp); 1155 IM = getstr("im", &cp); 1156 IF = getstr("if", &cp); 1157 if (HN && *HN) 1158 (void) strcpy(host_name, HN); 1159 if (IM == 0) 1160 IM = ""; 1161 } else { 1162 IM = DEFAULT_IM; 1163 HE = 0; 1164 } 1165 edithost(HE, host_name); 1166 ptyibuf2ptr = ptyibuf2; 1167 if (hostinfo) { 1168 if (IF) { 1169 char buf[_POSIX2_LINE_MAX]; 1170 FILE *fd; 1171 1172 if ((fd = fopen(IF, "r")) != NULL) { 1173 while (fgets(buf, sizeof(buf) - 1, fd) != NULL) 1174 ptyibuf2ptr = putf(buf, ptyibuf2ptr); 1175 fclose(fd); 1176 } 1177 } 1178 if (*IM) 1179 ptyibuf2ptr = putf(IM, ptyibuf2ptr); 1180 } 1181 1182 if (pcc) 1183 strncpy(ptyibuf2ptr, ptyip, pcc+1); 1184 ptyip = ptyibuf2; 1185 pcc = strlen(ptyip); 1186 #ifdef LINEMODE 1187 /* 1188 * Last check to make sure all our states are correct. 1189 */ 1190 init_termbuf(); 1191 localstat(); 1192 #endif /* LINEMODE */ 1193 1194 DIAG(TD_REPORT, 1195 {sprintf(nfrontp, "td: Entering processing loop\r\n"); 1196 nfrontp += strlen(nfrontp);}); 1197 1198 #ifdef convex 1199 startslave(host); 1200 #endif 1201 1202 nfd = ((f > p) ? f : p) + 1; 1203 for (;;) { 1204 fd_set ibits, obits, xbits; 1205 register int c; 1206 1207 if (ncc < 0 && pcc < 0) 1208 break; 1209 1210 #if defined(CRAY2) && defined(UNICOS5) 1211 if (needtermstat) 1212 _termstat(); 1213 #endif /* defined(CRAY2) && defined(UNICOS5) */ 1214 FD_ZERO(&ibits); 1215 FD_ZERO(&obits); 1216 FD_ZERO(&xbits); 1217 /* 1218 * Never look for input if there's still 1219 * stuff in the corresponding output buffer 1220 */ 1221 if (nfrontp - nbackp || pcc > 0) { 1222 FD_SET(f, &obits); 1223 } else { 1224 FD_SET(p, &ibits); 1225 } 1226 if (pfrontp - pbackp || ncc > 0) { 1227 FD_SET(p, &obits); 1228 } else { 1229 FD_SET(f, &ibits); 1230 } 1231 if (!SYNCHing) { 1232 FD_SET(f, &xbits); 1233 } 1234 if ((c = select(nfd, &ibits, &obits, &xbits, 1235 (struct timeval *)0)) < 1) { 1236 if (c == -1) { 1237 if (errno == EINTR) { 1238 continue; 1239 } 1240 } 1241 sleep(5); 1242 continue; 1243 } 1244 1245 /* 1246 * Any urgent data? 1247 */ 1248 if (FD_ISSET(net, &xbits)) { 1249 SYNCHing = 1; 1250 } 1251 1252 /* 1253 * Something to read from the network... 1254 */ 1255 if (FD_ISSET(net, &ibits)) { 1256 #if !defined(SO_OOBINLINE) 1257 /* 1258 * In 4.2 (and 4.3 beta) systems, the 1259 * OOB indication and data handling in the kernel 1260 * is such that if two separate TCP Urgent requests 1261 * come in, one byte of TCP data will be overlaid. 1262 * This is fatal for Telnet, but we try to live 1263 * with it. 1264 * 1265 * In addition, in 4.2 (and...), a special protocol 1266 * is needed to pick up the TCP Urgent data in 1267 * the correct sequence. 1268 * 1269 * What we do is: if we think we are in urgent 1270 * mode, we look to see if we are "at the mark". 1271 * If we are, we do an OOB receive. If we run 1272 * this twice, we will do the OOB receive twice, 1273 * but the second will fail, since the second 1274 * time we were "at the mark", but there wasn't 1275 * any data there (the kernel doesn't reset 1276 * "at the mark" until we do a normal read). 1277 * Once we've read the OOB data, we go ahead 1278 * and do normal reads. 1279 * 1280 * There is also another problem, which is that 1281 * since the OOB byte we read doesn't put us 1282 * out of OOB state, and since that byte is most 1283 * likely the TELNET DM (data mark), we would 1284 * stay in the TELNET SYNCH (SYNCHing) state. 1285 * So, clocks to the rescue. If we've "just" 1286 * received a DM, then we test for the 1287 * presence of OOB data when the receive OOB 1288 * fails (and AFTER we did the normal mode read 1289 * to clear "at the mark"). 1290 */ 1291 if (SYNCHing) { 1292 int atmark; 1293 1294 (void) ioctl(net, SIOCATMARK, (char *)&atmark); 1295 if (atmark) { 1296 ncc = recv(net, netibuf, sizeof (netibuf), MSG_OOB); 1297 if ((ncc == -1) && (errno == EINVAL)) { 1298 ncc = read(net, netibuf, sizeof (netibuf)); 1299 if (sequenceIs(didnetreceive, gotDM)) { 1300 SYNCHing = stilloob(net); 1301 } 1302 } 1303 } else { 1304 ncc = read(net, netibuf, sizeof (netibuf)); 1305 } 1306 } else { 1307 ncc = read(net, netibuf, sizeof (netibuf)); 1308 } 1309 settimer(didnetreceive); 1310 #else /* !defined(SO_OOBINLINE)) */ 1311 ncc = read(net, netibuf, sizeof (netibuf)); 1312 #endif /* !defined(SO_OOBINLINE)) */ 1313 if (ncc < 0 && errno == EWOULDBLOCK) 1314 ncc = 0; 1315 else { 1316 if (ncc <= 0) { 1317 break; 1318 } 1319 netip = netibuf; 1320 } 1321 DIAG((TD_REPORT | TD_NETDATA), 1322 {sprintf(nfrontp, "td: netread %d chars\r\n", ncc); 1323 nfrontp += strlen(nfrontp);}); 1324 DIAG(TD_NETDATA, printdata("nd", netip, ncc)); 1325 } 1326 1327 /* 1328 * Something to read from the pty... 1329 */ 1330 if (FD_ISSET(p, &ibits)) { 1331 #ifndef STREAMSPTY 1332 pcc = read(p, ptyibuf, BUFSIZ); 1333 #else 1334 pcc = readstream(p, ptyibuf, BUFSIZ); 1335 #endif 1336 /* 1337 * On some systems, if we try to read something 1338 * off the master side before the slave side is 1339 * opened, we get EIO. 1340 */ 1341 if (pcc < 0 && (errno == EWOULDBLOCK || 1342 #ifdef EAGAIN 1343 errno == EAGAIN || 1344 #endif 1345 errno == EIO)) { 1346 pcc = 0; 1347 } else { 1348 if (pcc <= 0) 1349 break; 1350 #if !defined(CRAY2) || !defined(UNICOS5) 1351 #ifdef LINEMODE 1352 /* 1353 * If ioctl from pty, pass it through net 1354 */ 1355 if (ptyibuf[0] & TIOCPKT_IOCTL) { 1356 copy_termbuf(ptyibuf+1, pcc-1); 1357 localstat(); 1358 pcc = 1; 1359 } 1360 #endif /* LINEMODE */ 1361 if (ptyibuf[0] & TIOCPKT_FLUSHWRITE) { 1362 netclear(); /* clear buffer back */ 1363 #ifndef NO_URGENT 1364 /* 1365 * There are client telnets on some 1366 * operating systems get screwed up 1367 * royally if we send them urgent 1368 * mode data. 1369 */ 1370 *nfrontp++ = IAC; 1371 *nfrontp++ = DM; 1372 neturg = nfrontp-1; /* off by one XXX */ 1373 DIAG(TD_OPTIONS, 1374 printoption("td: send IAC", DM)); 1375 1376 #endif 1377 } 1378 if (his_state_is_will(TELOPT_LFLOW) && 1379 (ptyibuf[0] & 1380 (TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) { 1381 int newflow = 1382 ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0; 1383 if (newflow != flowmode) { 1384 flowmode = newflow; 1385 (void) sprintf(nfrontp, 1386 "%c%c%c%c%c%c", 1387 IAC, SB, TELOPT_LFLOW, 1388 flowmode ? LFLOW_ON 1389 : LFLOW_OFF, 1390 IAC, SE); 1391 nfrontp += 6; 1392 DIAG(TD_OPTIONS, printsub('>', 1393 (unsigned char *)nfrontp-4, 1394 4);); 1395 } 1396 } 1397 pcc--; 1398 ptyip = ptyibuf+1; 1399 #else /* defined(CRAY2) && defined(UNICOS5) */ 1400 if (!uselinemode) { 1401 unpcc = pcc; 1402 unptyip = ptyibuf; 1403 pcc = term_output(&unptyip, ptyibuf2, 1404 &unpcc, BUFSIZ); 1405 ptyip = ptyibuf2; 1406 } else 1407 ptyip = ptyibuf; 1408 #endif /* defined(CRAY2) && defined(UNICOS5) */ 1409 } 1410 } 1411 1412 while (pcc > 0) { 1413 if ((&netobuf[BUFSIZ] - nfrontp) < 2) 1414 break; 1415 c = *ptyip++ & 0377, pcc--; 1416 if (c == IAC) 1417 *nfrontp++ = c; 1418 #if defined(CRAY2) && defined(UNICOS5) 1419 else if (c == '\n' && 1420 my_state_is_wont(TELOPT_BINARY) && newmap) 1421 *nfrontp++ = '\r'; 1422 #endif /* defined(CRAY2) && defined(UNICOS5) */ 1423 *nfrontp++ = c; 1424 if ((c == '\r') && (my_state_is_wont(TELOPT_BINARY))) { 1425 if (pcc > 0 && ((*ptyip & 0377) == '\n')) { 1426 *nfrontp++ = *ptyip++ & 0377; 1427 pcc--; 1428 } else 1429 *nfrontp++ = '\0'; 1430 } 1431 } 1432 #if defined(CRAY2) && defined(UNICOS5) 1433 /* 1434 * If chars were left over from the terminal driver, 1435 * note their existence. 1436 */ 1437 if (!uselinemode && unpcc) { 1438 pcc = unpcc; 1439 unpcc = 0; 1440 ptyip = unptyip; 1441 } 1442 #endif /* defined(CRAY2) && defined(UNICOS5) */ 1443 1444 if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0) 1445 netflush(); 1446 if (ncc > 0) 1447 telrcv(); 1448 if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0) 1449 ptyflush(); 1450 } 1451 cleanup(0); 1452 } /* end of telnet */ 1453 1454 #ifndef TCSIG 1455 # ifdef TIOCSIG 1456 # define TCSIG TIOCSIG 1457 # endif 1458 #endif 1459 1460 #ifdef STREAMSPTY 1461 1462 int flowison = -1; /* current state of flow: -1 is unknown */ 1463 1464 int readstream(p, ibuf, bufsize) 1465 int p; 1466 char *ibuf; 1467 int bufsize; 1468 { 1469 int flags = 0; 1470 int ret = 0; 1471 struct termios *tsp; 1472 struct termio *tp; 1473 struct iocblk *ip; 1474 char vstop, vstart; 1475 int ixon; 1476 int newflow; 1477 1478 strbufc.maxlen = BUFSIZ; 1479 strbufc.buf = (char *)ctlbuf; 1480 strbufd.maxlen = bufsize-1; 1481 strbufd.len = 0; 1482 strbufd.buf = ibuf+1; 1483 ibuf[0] = 0; 1484 1485 ret = getmsg(p, &strbufc, &strbufd, &flags); 1486 if (ret < 0) /* error of some sort -- probably EAGAIN */ 1487 return(-1); 1488 1489 if (strbufc.len <= 0 || ctlbuf[0] == M_DATA) { 1490 /* data message */ 1491 if (strbufd.len > 0) { /* real data */ 1492 return(strbufd.len + 1); /* count header char */ 1493 } else { 1494 /* nothing there */ 1495 errno = EAGAIN; 1496 return(-1); 1497 } 1498 } 1499 1500 /* 1501 * It's a control message. Return 1, to look at the flag we set 1502 */ 1503 1504 switch (ctlbuf[0]) { 1505 case M_FLUSH: 1506 if (ibuf[1] & FLUSHW) 1507 ibuf[0] = TIOCPKT_FLUSHWRITE; 1508 return(1); 1509 1510 case M_IOCTL: 1511 ip = (struct iocblk *) (ibuf+1); 1512 1513 switch (ip->ioc_cmd) { 1514 case TCSETS: 1515 case TCSETSW: 1516 case TCSETSF: 1517 tsp = (struct termios *) 1518 (ibuf+1 + sizeof(struct iocblk)); 1519 vstop = tsp->c_cc[VSTOP]; 1520 vstart = tsp->c_cc[VSTART]; 1521 ixon = tsp->c_iflag & IXON; 1522 break; 1523 case TCSETA: 1524 case TCSETAW: 1525 case TCSETAF: 1526 tp = (struct termio *) (ibuf+1 + sizeof(struct iocblk)); 1527 vstop = tp->c_cc[VSTOP]; 1528 vstart = tp->c_cc[VSTART]; 1529 ixon = tp->c_iflag & IXON; 1530 break; 1531 default: 1532 errno = EAGAIN; 1533 return(-1); 1534 } 1535 1536 newflow = (ixon && (vstart == 021) && (vstop == 023)) ? 1 : 0; 1537 if (newflow != flowison) { /* it's a change */ 1538 flowison = newflow; 1539 ibuf[0] = newflow ? TIOCPKT_DOSTOP : TIOCPKT_NOSTOP; 1540 return(1); 1541 } 1542 } 1543 1544 /* nothing worth doing anything about */ 1545 errno = EAGAIN; 1546 return(-1); 1547 } 1548 #endif /* STREAMSPTY */ 1549 1550 /* 1551 * Send interrupt to process on other side of pty. 1552 * If it is in raw mode, just write NULL; 1553 * otherwise, write intr char. 1554 */ 1555 void 1556 interrupt() 1557 { 1558 ptyflush(); /* half-hearted */ 1559 1560 #if defined(STREAMSPTY) && defined(TIOCSIGNAL) 1561 /* Streams PTY style ioctl to post a signal */ 1562 { 1563 int sig = SIGINT; 1564 (void) ioctl(pty, TIOCSIGNAL, &sig); 1565 (void) ioctl(pty, I_FLUSH, FLUSHR); 1566 } 1567 #else 1568 #ifdef TCSIG 1569 (void) ioctl(pty, TCSIG, (char *)SIGINT); 1570 #else /* TCSIG */ 1571 init_termbuf(); 1572 *pfrontp++ = slctab[SLC_IP].sptr ? 1573 (unsigned char)*slctab[SLC_IP].sptr : '\177'; 1574 #endif /* TCSIG */ 1575 #endif 1576 } 1577 1578 /* 1579 * Send quit to process on other side of pty. 1580 * If it is in raw mode, just write NULL; 1581 * otherwise, write quit char. 1582 */ 1583 void 1584 sendbrk() 1585 { 1586 ptyflush(); /* half-hearted */ 1587 #ifdef TCSIG 1588 (void) ioctl(pty, TCSIG, (char *)SIGQUIT); 1589 #else /* TCSIG */ 1590 init_termbuf(); 1591 *pfrontp++ = slctab[SLC_ABORT].sptr ? 1592 (unsigned char)*slctab[SLC_ABORT].sptr : '\034'; 1593 #endif /* TCSIG */ 1594 } 1595 1596 void 1597 sendsusp() 1598 { 1599 #ifdef SIGTSTP 1600 ptyflush(); /* half-hearted */ 1601 # ifdef TCSIG 1602 (void) ioctl(pty, TCSIG, (char *)SIGTSTP); 1603 # else /* TCSIG */ 1604 *pfrontp++ = slctab[SLC_SUSP].sptr ? 1605 (unsigned char)*slctab[SLC_SUSP].sptr : '\032'; 1606 # endif /* TCSIG */ 1607 #endif /* SIGTSTP */ 1608 } 1609 1610 /* 1611 * When we get an AYT, if ^T is enabled, use that. Otherwise, 1612 * just send back "[Yes]". 1613 */ 1614 void 1615 recv_ayt() 1616 { 1617 #if defined(SIGINFO) && defined(TCSIG) 1618 if (slctab[SLC_AYT].sptr && *slctab[SLC_AYT].sptr != _POSIX_VDISABLE) { 1619 (void) ioctl(pty, TCSIG, (char *)SIGINFO); 1620 return; 1621 } 1622 #endif 1623 (void) strcpy(nfrontp, "\r\n[Yes]\r\n"); 1624 nfrontp += 9; 1625 } 1626 1627 void 1628 doeof() 1629 { 1630 init_termbuf(); 1631 1632 #if defined(LINEMODE) && defined(USE_TERMIO) && (VEOF == VMIN) 1633 if (!tty_isediting()) { 1634 extern char oldeofc; 1635 *pfrontp++ = oldeofc; 1636 return; 1637 } 1638 #endif 1639 *pfrontp++ = slctab[SLC_EOF].sptr ? 1640 (unsigned char)*slctab[SLC_EOF].sptr : '\004'; 1641 } 1642
Indexes created Wed Oct 01 07:09:59 GMT 2025