appl/telnet/telnetd/telnetd.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "telnetd.h"
  35
  36 RCSID("$Id$");
  37
  38 #ifdef _SC_CRAY_SECURE_SYS
  39 #include <sys/sysv.h>
  40 #include <sys/secdev.h>
  41 #include <sys/secparm.h>
  42 #include <sys/usrv.h>
  43 int     secflag;
  44 char    tty_dev[16];
  45 struct  secdev dv;
  46 struct  sysv sysv;
  47 struct  socksec ss;
  48 #endif  /* _SC_CRAY_SECURE_SYS */
  49
  50 #ifdef AUTHENTICATION
  51 int     auth_level = 0;
  52 #endif
  53
  54 extern  int utmp_len;
  55 int     registerd_host_only = 0;
  56
  57 #ifdef  STREAMSPTY
  58 # include <stropts.h>
  59 # include <termios.h>
  60 #ifdef HAVE_SYS_UIO_H
  61 #include <sys/uio.h>
  62 #endif /* HAVE_SYS_UIO_H */
  63 #ifdef HAVE_SYS_STREAM_H
  64 #include <sys/stream.h>
  65 #endif
  66 #ifdef _AIX
  67 #include <sys/termio.h>
  68 #endif
  69 # ifdef HAVE_SYS_STRTTY_H
  70 # include <sys/strtty.h>
  71 # endif
  72 # ifdef HAVE_SYS_STR_TTY_H
  73 # include <sys/str_tty.h>
  74 # endif
  75 /* make sure we don't get the bsd version */
  76 /* what is this here for? solaris? /joda */
  77 # ifdef HAVE_SYS_TTY_H
  78 # include "/usr/include/sys/tty.h"
  79 # endif
  80 # ifdef HAVE_SYS_PTYVAR_H
  81 # include <sys/ptyvar.h>
  82 # endif
  83
  84 /*
  85  * Because of the way ptyibuf is used with streams messages, we need
  86  * ptyibuf+1 to be on a full-word boundary.  The following wierdness
  87  * is simply to make that happen.
  88  */
  89 long    ptyibufbuf[BUFSIZ/sizeof(long)+1];
  90 char    *ptyibuf = ((char *)&ptyibufbuf[1])-1;
  91 char    *ptyip = ((char *)&ptyibufbuf[1])-1;
  92 char    ptyibuf2[BUFSIZ];
  93 unsigned char ctlbuf[BUFSIZ];
  94 struct  strbuf strbufc, strbufd;
  95
  96 int readstream(int, char*, int);
  97
  98 #else   /* ! STREAMPTY */
  99
 100 /*
 101  * I/O data buffers,
 102  * pointers, and counters.
 103  */
 104 char    ptyibuf[BUFSIZ], *ptyip = ptyibuf;
 105 char    ptyibuf2[BUFSIZ];
 106
 107 #endif /* ! STREAMPTY */
 108
 109 int     hostinfo = 1;                   /* do we print login banner? */
 110
 111 #ifdef  _CRAY
 112 extern int      newmap; /* nonzero if \n maps to ^M^J */
 113 int     lowpty = 0, highpty;    /* low, high pty numbers */
 114 #endif /* CRAY */
 115
 116 int debug = 0;
 117 int keepalive = 1;
 118 char *progname;
 119
 120 extern void usage (void);
 121
 122 /*
 123  * The string to pass to getopt().  We do it this way so
 124  * that only the actual options that we support will be
 125  * passed off to getopt().
 126  */
 127 char valid_opts[] = "Bd:hklnS:u:UL:y"
 128 #ifdef AUTHENTICATION
 129                     "a:X:z"
 130 #endif
 131 #ifdef DIAGNOSTICS
 132                     "D:"
 133 #endif
 134 #ifdef _CRAY
 135                     "r:"
 136 #endif
 137                     ;
 138
 139 void doit(struct sockaddr_in*);
 140
 141 int main(int argc, char **argv)
 142 {
 143     struct sockaddr_in from;
 144     int on = 1, fromlen;
 145     int ch;
 146 #if     defined(IPPROTO_IP) && defined(IP_TOS)
 147     int tos = -1;
 148 #endif
 149 #ifdef ENCRYPTION
 150     extern int des_check_key;
 151     des_check_key = 1;  /* Kludge for Mac NCSA telnet 2.6 /bg */
 152 #endif
 153     pfrontp = pbackp = ptyobuf;
 154     netip = netibuf;
 155     nfrontp = nbackp = netobuf;
 156
 157     progname = *argv;
 158 #ifdef ENCRYPTION
 159     nclearto = 0;
 160 #endif
 161
 162 #ifdef _CRAY
 163     /*
 164      * Get number of pty's before trying to process options,
 165      * which may include changing pty range.
 166      */
 167     highpty = getnpty();
 168 #endif /* CRAY */
 169
 170     while ((ch = getopt(argc, argv, valid_opts)) != EOF) {
 171         switch(ch) {
 172
 173 #ifdef  AUTHENTICATION
 174         case 'a':
 175             /*
 176              * Check for required authentication level
 177              */
 178             if (strcmp(optarg, "debug") == 0) {
 179                 auth_debug_mode = 1;
 180             } else if (strcasecmp(optarg, "none") == 0) {
 181                 auth_level = 0;
 182             } else if (strcasecmp(optarg, "otp") == 0) {
 183                 auth_level = 0;
 184                 require_otp = 1;
 185             } else if (strcasecmp(optarg, "other") == 0) {
 186                 auth_level = AUTH_OTHER;
 187             } else if (strcasecmp(optarg, "user") == 0) {
 188                 auth_level = AUTH_USER;
 189             } else if (strcasecmp(optarg, "valid") == 0) {
 190                 auth_level = AUTH_VALID;
 191             } else if (strcasecmp(optarg, "off") == 0) {
 192                 /*
 193                  * This hack turns off authentication
 194                  */
 195                 auth_level = -1;
 196             } else {
 197                 fprintf(stderr,
 198                         "telnetd: unknown authorization level for -a\n");
 199             }
 200             break;
 201 #endif  /* AUTHENTICATION */
 202
 203         case 'B': /* BFTP mode is not supported any more */
 204             break;
 205         case 'd':
 206             if (strcmp(optarg, "ebug") == 0) {
 207                 debug++;
 208                 break;
 209             }
 210             usage();
 211             /* NOTREACHED */
 212             break;
 213
 214 #ifdef DIAGNOSTICS
 215         case 'D':
 216             /*
 217              * Check for desired diagnostics capabilities.
 218              */
 219             if (!strcmp(optarg, "report")) {
 220                 diagnostic |= TD_REPORT|TD_OPTIONS;
 221             } else if (!strcmp(optarg, "exercise")) {
 222                 diagnostic |= TD_EXERCISE;
 223             } else if (!strcmp(optarg, "netdata")) {
 224                 diagnostic |= TD_NETDATA;
 225             } else if (!strcmp(optarg, "ptydata")) {
 226                 diagnostic |= TD_PTYDATA;
 227             } else if (!strcmp(optarg, "options")) {
 228                 diagnostic |= TD_OPTIONS;
 229             } else {
 230                 usage();
 231                 /* NOT REACHED */
 232             }
 233             break;
 234 #endif /* DIAGNOSTICS */
 235
 236
 237         case 'h':
 238             hostinfo = 0;
 239             break;
 240
 241         case 'k': /* Linemode is not supported any more */
 242         case 'l':
 243             break;
 244
 245         case 'n':
 246             keepalive = 0;
 247             break;
 248
 249 #ifdef _CRAY
 250         case 'r':
 251             {
 252                 char *strchr();
 253                 char *c;
 254
 255                 /*
 256                  * Allow the specification of alterations
 257                  * to the pty search range.  It is legal to
 258                  * specify only one, and not change the
 259                  * other from its default.
 260                  */
 261                 c = strchr(optarg, '-');
 262                 if (c) {
 263                     *c++ = '\0';
 264                     highpty = atoi(c);
 265                 }
 266                 if (*optarg != '\0')
 267                     lowpty = atoi(optarg);
 268                 if ((lowpty > highpty) || (lowpty < 0) ||
 269                     (highpty > 32767)) {
 270                     usage();
 271                     /* NOT REACHED */
 272                 }
 273                 break;
 274             }
 275 #endif  /* CRAY */
 276
 277         case 'S':
 278 #ifdef  HAVE_PARSETOS
 279             if ((tos = parsetos(optarg, "tcp")) < 0)
 280                 fprintf(stderr, "%s%s%s\n",
 281                         "telnetd: Bad TOS argument '", optarg,
 282                         "'; will try to use default TOS");
 283 #else
 284             fprintf(stderr, "%s%s\n", "TOS option unavailable; ",
 285                     "-S flag not supported\n");
 286 #endif
 287             break;
 288
 289         case 'u':
 290             utmp_len = atoi(optarg);
 291             break;
 292
 293         case 'U':
 294             registerd_host_only = 1;
 295             break;
 296
 297 #ifdef  AUTHENTICATION
 298         case 'X':
 299             /*
 300              * Check for invalid authentication types
 301              */
 302             auth_disable_name(optarg);
 303             break;
 304 #endif
 305         case 'y':
 306             no_warn = 1;
 307             break;
 308 #ifdef AUTHENTICATION
 309         case 'z':
 310             log_unauth = 1;
 311             break;
 312
 313 #endif  /* AUTHENTICATION */
 314
 315         case 'L':
 316             new_login = optarg;
 317             break;
 318
 319         default:
 320             fprintf(stderr, "telnetd: %c: unknown option\n", ch);
 321             /* FALLTHROUGH */
 322         case '?':
 323             usage();
 324             /* NOTREACHED */
 325         }
 326     }
 327
 328     argc -= optind;
 329     argv += optind;
 330
 331     if (debug) {
 332         int port = 0;
 333         struct servent *sp;
 334
 335         if (argc > 1) {
 336             usage ();
 337         } else if (argc == 1) {
 338             sp = roken_getservbyname (*argv, "tcp");
 339             if (sp)
 340                 port = sp->s_port;
 341             else
 342                 port = htons(atoi(*argv));
 343         } else {
 344 #ifdef KRB5
 345             port = krb5_getportbyname (NULL, "telnet", "tcp", 23);
 346 #else
 347             port = k_getportbyname("telnet", "tcp", htons(23));
 348 #endif
 349         }
 350         mini_inetd (port);
 351     } else if (argc > 0) {
 352         usage();
 353         /* NOT REACHED */
 354     }
 355
 356 #ifdef _SC_CRAY_SECURE_SYS
 357     secflag = sysconf(_SC_CRAY_SECURE_SYS);
 358
 359     /*
 360      *  Get socket's security label
 361      */
 362     if (secflag)  {
 363         int szss = sizeof(ss);
 364         int sock_multi;
 365         int szi = sizeof(int);
 366
 367         memset(&dv, 0, sizeof(dv));
 368
 369         if (getsysv(&sysv, sizeof(struct sysv)) != 0)
 370             fatalperror(net, "getsysv");
 371
 372         /*
 373          *      Get socket security label and set device values
 374          *         {security label to be set on ttyp device}
 375          */
 376 #ifdef SO_SEC_MULTI                     /* 8.0 code */
 377         if ((getsockopt(0, SOL_SOCKET, SO_SECURITY,
 378                         (void *)&ss, &szss) < 0) ||
 379             (getsockopt(0, SOL_SOCKET, SO_SEC_MULTI,
 380                         (void *)&sock_multi, &szi) < 0))
 381             fatalperror(net, "getsockopt");
 382         else {
 383             dv.dv_actlvl = ss.ss_actlabel.lt_level;
 384             dv.dv_actcmp = ss.ss_actlabel.lt_compart;
 385             if (!sock_multi) {
 386                 dv.dv_minlvl = dv.dv_maxlvl = dv.dv_actlvl;
 387                 dv.dv_valcmp = dv.dv_actcmp;
 388             } else {
 389                 dv.dv_minlvl = ss.ss_minlabel.lt_level;
 390                 dv.dv_maxlvl = ss.ss_maxlabel.lt_level;
 391                 dv.dv_valcmp = ss.ss_maxlabel.lt_compart;
 392             }
 393             dv.dv_devflg = 0;
 394         }
 395 #else /* SO_SEC_MULTI */                /* 7.0 code */
 396         if (getsockopt(0, SOL_SOCKET, SO_SECURITY,
 397                        (void *)&ss, &szss) >= 0) {
 398             dv.dv_actlvl = ss.ss_slevel;
 399             dv.dv_actcmp = ss.ss_compart;
 400             dv.dv_minlvl = ss.ss_minlvl;
 401             dv.dv_maxlvl = ss.ss_maxlvl;
 402             dv.dv_valcmp = ss.ss_maxcmp;
 403         }
 404 #endif /* SO_SEC_MULTI */
 405     }
 406 #endif  /* _SC_CRAY_SECURE_SYS */
 407
 408     roken_openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON);
 409     fromlen = sizeof (from);
 410     if (getpeername(STDIN_FILENO, (struct sockaddr *)&from, &fromlen) < 0) {
 411         fprintf(stderr, "%s: ", progname);
 412         perror("getpeername");
 413         _exit(1);
 414     }
 415     if (keepalive &&
 416         setsockopt(0, SOL_SOCKET, SO_KEEPALIVE,
 417                    (void *)&on, sizeof (on)) < 0) {
 418         syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
 419     }
 420
 421 #if     defined(IPPROTO_IP) && defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
 422     {
 423 # ifdef HAVE_GETTOSBYNAME
 424         struct tosent *tp;
 425         if (tos < 0 && (tp = gettosbyname("telnet", "tcp")))
 426             tos = tp->t_tos;
 427 # endif
 428         if (tos < 0)
 429             tos = 020;  /* Low Delay bit */
 430         if (tos
 431             && (setsockopt(0, IPPROTO_IP, IP_TOS,
 432                            (void *)&tos, sizeof(tos)) < 0)
 433             && (errno != ENOPROTOOPT) )
 434             syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
 435     }
 436 #endif  /* defined(IPPROTO_IP) && defined(IP_TOS) */
 437     net = 0;
 438     doit(&from);
 439     /* NOTREACHED */
 440     return 0;
 441 }  /* end of main */
 442
 443 void
 444 usage()
 445 {
 446     fprintf(stderr, "Usage: telnetd");
 447 #ifdef  AUTHENTICATION
 448     fprintf(stderr, " [-a (debug|other|otp|user|valid|off|none)]\n\t");
 449 #endif
 450     fprintf(stderr, " [-debug]");
 451 #ifdef DIAGNOSTICS
 452     fprintf(stderr, " [-D (options|report|exercise|netdata|ptydata)]\n\t");
 453 #endif
 454 #ifdef  AUTHENTICATION
 455     fprintf(stderr, " [-edebug]");
 456 #endif
 457     fprintf(stderr, " [-h]");
 458     fprintf(stderr, " [-L login]");
 459     fprintf(stderr, " [-n]");
 460 #ifdef  _CRAY
 461     fprintf(stderr, " [-r[lowpty]-[highpty]]");
 462 #endif
 463     fprintf(stderr, "\n\t");
 464 #ifdef  HAVE_GETTOSBYNAME
 465     fprintf(stderr, " [-S tos]");
 466 #endif
 467 #ifdef  AUTHENTICATION
 468     fprintf(stderr, " [-X auth-type] [-y] [-z]");
 469 #endif
 470     fprintf(stderr, " [-u utmp_hostname_length] [-U]");
 471     fprintf(stderr, " [port]\n");
 472     exit(1);
 473 }
 474
 475 /*
 476  * getterminaltype
 477  *
 478  *      Ask the other end to send along its terminal type and speed.
 479  * Output is the variable terminaltype filled in.
 480  */
 481 static unsigned char ttytype_sbbuf[] = {
 482     IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE
 483 };
 484
 485 int
 486 getterminaltype(char *name, size_t name_sz)
 487 {
 488     int retval = -1;
 489     void _gettermname();
 490
 491     settimer(baseline);
 492 #ifdef AUTHENTICATION
 493     /*
 494      * Handle the Authentication option before we do anything else.
 495      */
 496     send_do(TELOPT_AUTHENTICATION, 1);
 497     while (his_will_wont_is_changing(TELOPT_AUTHENTICATION))
 498         ttloop();
 499     if (his_state_is_will(TELOPT_AUTHENTICATION)) {
 500         retval = auth_wait(name, name_sz);
 501     }
 502 #endif
 503
 504 #ifdef ENCRYPTION
 505     send_will(TELOPT_ENCRYPT, 1);
 506     send_do(TELOPT_ENCRYPT, 1); /* esc@magic.fi */
 507 #endif
 508     send_do(TELOPT_TTYPE, 1);
 509     send_do(TELOPT_TSPEED, 1);
 510     send_do(TELOPT_XDISPLOC, 1);
 511     send_do(TELOPT_NEW_ENVIRON, 1);
 512     send_do(TELOPT_OLD_ENVIRON, 1);
 513     while (
 514 #ifdef ENCRYPTION
 515            his_do_dont_is_changing(TELOPT_ENCRYPT) ||
 516 #endif
 517            his_will_wont_is_changing(TELOPT_TTYPE) ||
 518            his_will_wont_is_changing(TELOPT_TSPEED) ||
 519            his_will_wont_is_changing(TELOPT_XDISPLOC) ||
 520            his_will_wont_is_changing(TELOPT_NEW_ENVIRON) ||
 521            his_will_wont_is_changing(TELOPT_OLD_ENVIRON)) {
 522         ttloop();
 523     }
 524 #ifdef ENCRYPTION
 525     /*
 526      * Wait for the negotiation of what type of encryption we can
 527      * send with.  If autoencrypt is not set, this will just return.
 528      */
 529     if (his_state_is_will(TELOPT_ENCRYPT)) {
 530         encrypt_wait();
 531     }
 532 #endif
 533     if (his_state_is_will(TELOPT_TSPEED)) {
 534         static unsigned char sb[] =
 535         { IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE };
 536
 537         telnet_net_write (sb, sizeof sb);
 538         DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
 539     }
 540     if (his_state_is_will(TELOPT_XDISPLOC)) {
 541         static unsigned char sb[] =
 542         { IAC, SB, TELOPT_XDISPLOC, TELQUAL_SEND, IAC, SE };
 543
 544         telnet_net_write (sb, sizeof sb);
 545         DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
 546     }
 547     if (his_state_is_will(TELOPT_NEW_ENVIRON)) {
 548         static unsigned char sb[] =
 549         { IAC, SB, TELOPT_NEW_ENVIRON, TELQUAL_SEND, IAC, SE };
 550
 551         telnet_net_write (sb, sizeof sb);
 552         DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
 553     }
 554     else if (his_state_is_will(TELOPT_OLD_ENVIRON)) {
 555         static unsigned char sb[] =
 556         { IAC, SB, TELOPT_OLD_ENVIRON, TELQUAL_SEND, IAC, SE };
 557
 558         telnet_net_write (sb, sizeof sb);
 559         DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
 560     }
 561     if (his_state_is_will(TELOPT_TTYPE)) {
 562
 563         telnet_net_write (ttytype_sbbuf, sizeof ttytype_sbbuf);
 564         DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2,
 565                                   sizeof ttytype_sbbuf - 2););
 566     }
 567     if (his_state_is_will(TELOPT_TSPEED)) {
 568         while (sequenceIs(tspeedsubopt, baseline))
 569             ttloop();
 570     }
 571     if (his_state_is_will(TELOPT_XDISPLOC)) {
 572         while (sequenceIs(xdisplocsubopt, baseline))
 573             ttloop();
 574     }
 575     if (his_state_is_will(TELOPT_NEW_ENVIRON)) {
 576         while (sequenceIs(environsubopt, baseline))
 577             ttloop();
 578     }
 579     if (his_state_is_will(TELOPT_OLD_ENVIRON)) {
 580         while (sequenceIs(oenvironsubopt, baseline))
 581             ttloop();
 582     }
 583     if (his_state_is_will(TELOPT_TTYPE)) {
 584         char first[256], last[256];
 585
 586         while (sequenceIs(ttypesubopt, baseline))
 587             ttloop();
 588
 589         /*
 590          * If the other side has already disabled the option, then
 591          * we have to just go with what we (might) have already gotten.
 592          */
 593         if (his_state_is_will(TELOPT_TTYPE) && !terminaltypeok(terminaltype)) {
 594             strcpy_truncate(first, terminaltype, sizeof(first));
 595             for(;;) {
 596                 /*
 597                  * Save the unknown name, and request the next name.
 598                  */
 599                 strcpy_truncate(last, terminaltype, sizeof(last));
 600                 _gettermname();
 601                 if (terminaltypeok(terminaltype))
 602                     break;
 603                 if ((strncmp(last, terminaltype, sizeof(last)) == 0) ||
 604                     his_state_is_wont(TELOPT_TTYPE)) {
 605                     /*
 606                      * We've hit the end.  If this is the same as
 607                      * the first name, just go with it.
 608                      */
 609                     if (strncmp(first, terminaltype, sizeof(first)) == 0)
 610                         break;
 611                     /*
 612                      * Get the terminal name one more time, so that
 613                      * RFC1091 compliant telnets will cycle back to
 614                      * the start of the list.
 615                      */
 616                     _gettermname();
 617                     if (strncmp(first, terminaltype, sizeof(first)) != 0)
 618                         strcpy(terminaltype, first);
 619                     break;
 620                 }
 621             }
 622         }
 623     }
 624     return(retval);
 625 }  /* end of getterminaltype */
 626
 627 void
 628 _gettermname()
 629 {
 630     /*
 631      * If the client turned off the option,
 632      * we can't send another request, so we
 633      * just return.
 634      */
 635     if (his_state_is_wont(TELOPT_TTYPE))
 636         return;
 637     settimer(baseline);
 638     telnet_net_write (ttytype_sbbuf, sizeof ttytype_sbbuf);
 639     DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2,
 640                               sizeof ttytype_sbbuf - 2););
 641     while (sequenceIs(ttypesubopt, baseline))
 642         ttloop();
 643 }
 644
 645 int
 646 terminaltypeok(char *s)
 647 {
 648     return 1;
 649 }
 650
 651
 652 char *hostname;
 653 char host_name[MaxHostNameLen];
 654 char remote_host_name[MaxHostNameLen];
 655
 656 /*
 657  * Get a pty, scan input lines.
 658  */
 659 void
 660 doit(struct sockaddr_in *who)
 661 {
 662     char *host = NULL;
 663     struct hostent *hp;
 664     int level;
 665     int ptynum;
 666     char user_name[256];
 667
 668     /*
 669      * Find an available pty to use.
 670      */
 671     ourpty = getpty(&ptynum);
 672     if (ourpty < 0)
 673         fatal(net, "All network ports in use");
 674
 675 #ifdef _SC_CRAY_SECURE_SYS
 676     /*
 677      *  set ttyp line security label
 678      */
 679     if (secflag) {
 680         char slave_dev[16];
 681
 682         snprintf(tty_dev, sizeof(tty_dev), "/dev/pty/%03d", ptynum);
 683         if (setdevs(tty_dev, &dv) < 0)
 684             fatal(net, "cannot set pty security");
 685         snprintf(slave_dev, sizeof(slave_dev), "/dev/ttyp%03d", ptynum);
 686         if (setdevs(slave_dev, &dv) < 0)
 687             fatal(net, "cannot set tty security");
 688     }
 689 #endif  /* _SC_CRAY_SECURE_SYS */
 690
 691     /* get name of connected client */
 692     hp = roken_gethostbyaddr((const char *)&who->sin_addr,
 693                        sizeof (struct in_addr),
 694                        who->sin_family);
 695
 696     if (hp == NULL && registerd_host_only) {
 697         fatal(net, "Couldn't resolve your address into a host name.\r\n\
 698 Please contact your net administrator");
 699     } else if (hp) {
 700         host = hp->h_name;
 701     } else {
 702         host = inet_ntoa(who->sin_addr);
 703     }
 704     /*
 705      * We must make a copy because Kerberos is probably going
 706      * to also do a gethost* and overwrite the static data...
 707      */
 708     strcpy_truncate(remote_host_name, host, sizeof(remote_host_name));
 709     host = remote_host_name;
 710
 711     /* XXX - should be k_gethostname? */
 712     gethostname(host_name, sizeof (host_name));
 713     hostname = host_name;
 714
 715     /* Only trim if too long (and possible) */
 716     if (strlen(remote_host_name) > abs(utmp_len)) {
 717         char *domain = strchr(host_name, '.');
 718         char *p = strchr(remote_host_name, '.');
 719         if (domain && p && (strcmp(p, domain) == 0))
 720             *p = 0; /* remove domain part */
 721     }
 722
 723
 724     /*
 725      * If hostname still doesn't fit utmp, use ipaddr.
 726      */
 727     if (strlen(remote_host_name) > abs(utmp_len))
 728         strcpy_truncate(remote_host_name,
 729                 inet_ntoa(who->sin_addr),
 730                 sizeof(remote_host_name));
 731
 732 #ifdef AUTHENTICATION
 733     auth_encrypt_init(hostname, host, "TELNETD", 1);
 734 #endif
 735
 736     init_env();
 737     /*
 738      * get terminal type.
 739      */
 740     *user_name = 0;
 741     level = getterminaltype(user_name, sizeof(user_name));
 742     setenv("TERM", terminaltype ? terminaltype : "network", 1);
 743
 744 #ifdef _SC_CRAY_SECURE_SYS
 745     if (secflag) {
 746         if (setulvl(dv.dv_actlvl) < 0)
 747             fatal(net,"cannot setulvl()");
 748         if (setucmp(dv.dv_actcmp) < 0)
 749             fatal(net, "cannot setucmp()");
 750     }
 751 #endif  /* _SC_CRAY_SECURE_SYS */
 752
 753     /* begin server processing */
 754     my_telnet(net, ourpty, host, level, user_name);
 755     /*NOTREACHED*/
 756 }  /* end of doit */
 757
 758 /* output contents of /etc/issue.net, or /etc/issue */
 759 static void
 760 show_issue(void)
 761 {
 762     FILE *f;
 763     char buf[128];
 764     f = fopen("/etc/issue.net", "r");
 765     if(f == NULL)
 766         f = fopen("/etc/issue", "r");
 767     if(f){
 768         while(fgets(buf, sizeof(buf)-2, f)){
 769             strcpy(buf + strcspn(buf, "\r\n"), "\r\n");
 770             writenet((unsigned char*)buf, strlen(buf));
 771         }
 772         fclose(f);
 773     }
 774 }
 775
 776 /*
 777  * Main loop.  Select from pty and network, and
 778  * hand data to telnet receiver finite state machine.
 779  */
 780 void
 781 my_telnet(int f, int p, char *host, int level, char *autoname)
 782 {
 783     int on = 1;
 784     char *he;
 785     char *IM;
 786     int nfd;
 787     int startslave_called = 0;
 788     time_t timeout;
 789
 790     /*
 791      * Initialize the slc mapping table.
 792      */
 793     get_slc_defaults();
 794
 795     /*
 796      * Do some tests where it is desireable to wait for a response.
 797      * Rather than doing them slowly, one at a time, do them all
 798      * at once.
 799      */
 800     if (my_state_is_wont(TELOPT_SGA))
 801         send_will(TELOPT_SGA, 1);
 802     /*
 803      * Is the client side a 4.2 (NOT 4.3) system?  We need to know this
 804      * because 4.2 clients are unable to deal with TCP urgent data.
 805      *
 806      * To find out, we send out a "DO ECHO".  If the remote system
 807      * answers "WILL ECHO" it is probably a 4.2 client, and we note
 808      * that fact ("WILL ECHO" ==> that the client will echo what
 809      * WE, the server, sends it; it does NOT mean that the client will
 810      * echo the terminal input).
 811      */
 812     send_do(TELOPT_ECHO, 1);
 813
 814     /*
 815      * Send along a couple of other options that we wish to negotiate.
 816      */
 817     send_do(TELOPT_NAWS, 1);
 818     send_will(TELOPT_STATUS, 1);
 819     flowmode = 1;               /* default flow control state */
 820     restartany = -1;    /* uninitialized... */
 821     send_do(TELOPT_LFLOW, 1);
 822
 823     /*
 824      * Spin, waiting for a response from the DO ECHO.  However,
 825      * some REALLY DUMB telnets out there might not respond
 826      * to the DO ECHO.  So, we spin looking for NAWS, (most dumb
 827      * telnets so far seem to respond with WONT for a DO that
 828      * they don't understand...) because by the time we get the
 829      * response, it will already have processed the DO ECHO.
 830      * Kludge upon kludge.
 831      */
 832     while (his_will_wont_is_changing(TELOPT_NAWS))
 833         ttloop();
 834
 835     /*
 836      * But...
 837      * The client might have sent a WILL NAWS as part of its
 838      * startup code; if so, we'll be here before we get the
 839      * response to the DO ECHO.  We'll make the assumption
 840      * that any implementation that understands about NAWS
 841      * is a modern enough implementation that it will respond
 842      * to our DO ECHO request; hence we'll do another spin
 843      * waiting for the ECHO option to settle down, which is
 844      * what we wanted to do in the first place...
 845      */
 846     if (his_want_state_is_will(TELOPT_ECHO) &&
 847         his_state_is_will(TELOPT_NAWS)) {
 848         while (his_will_wont_is_changing(TELOPT_ECHO))
 849             ttloop();
 850     }
 851     /*
 852      * On the off chance that the telnet client is broken and does not
 853      * respond to the DO ECHO we sent, (after all, we did send the
 854      * DO NAWS negotiation after the DO ECHO, and we won't get here
 855      * until a response to the DO NAWS comes back) simulate the
 856      * receipt of a will echo.  This will also send a WONT ECHO
 857      * to the client, since we assume that the client failed to
 858      * respond because it believes that it is already in DO ECHO
 859      * mode, which we do not want.
 860      */
 861     if (his_want_state_is_will(TELOPT_ECHO)) {
 862         DIAG(TD_OPTIONS,
 863              {output_data("td: simulating recv\r\n");
 864              });
 865         willoption(TELOPT_ECHO);
 866     }
 867
 868     /*
 869      * Finally, to clean things up, we turn on our echo.  This
 870      * will break stupid 4.2 telnets out of local terminal echo.
 871      */
 872
 873     if (my_state_is_wont(TELOPT_ECHO))
 874         send_will(TELOPT_ECHO, 1);
 875
 876 #ifdef TIOCPKT
 877 #ifdef  STREAMSPTY
 878     if (!really_stream)
 879 #endif
 880         /*
 881          * Turn on packet mode
 882          */
 883         ioctl(p, TIOCPKT, (char *)&on);
 884 #endif
 885
 886
 887     /*
 888      * Call telrcv() once to pick up anything received during
 889      * terminal type negotiation, 4.2/4.3 determination, and
 890      * linemode negotiation.
 891      */
 892     telrcv();
 893
 894     ioctl(f, FIONBIO, (char *)&on);
 895     ioctl(p, FIONBIO, (char *)&on);
 896
 897 #if     defined(SO_OOBINLINE) && defined(HAVE_SETSOCKOPT)
 898     setsockopt(net, SOL_SOCKET, SO_OOBINLINE,
 899                (void *)&on, sizeof on);
 900 #endif  /* defined(SO_OOBINLINE) */
 901
 902 #ifdef  SIGTSTP
 903     signal(SIGTSTP, SIG_IGN);
 904 #endif
 905 #ifdef  SIGTTOU
 906     /*
 907      * Ignoring SIGTTOU keeps the kernel from blocking us
 908      * in ttioct() in /sys/tty.c.
 909      */
 910     signal(SIGTTOU, SIG_IGN);
 911 #endif
 912
 913     signal(SIGCHLD, cleanup);
 914
 915 #ifdef  TIOCNOTTY
 916     {
 917         int t;
 918         t = open(_PATH_TTY, O_RDWR);
 919         if (t >= 0) {
 920             ioctl(t, TIOCNOTTY, (char *)0);
 921             close(t);
 922         }
 923     }
 924 #endif
 925
 926     show_issue();
 927     /*
 928      * Show banner that getty never gave.
 929      *
 930      * We put the banner in the pty input buffer.  This way, it
 931      * gets carriage return null processing, etc., just like all
 932      * other pty --> client data.
 933      */
 934
 935     if (getenv("USER"))
 936         hostinfo = 0;
 937
 938     IM = DEFAULT_IM;
 939     he = 0;
 940     edithost(he, host_name);
 941     if (hostinfo && *IM)
 942         putf(IM, ptyibuf2);
 943
 944     if (pcc)
 945         strncat(ptyibuf2, ptyip, pcc+1);
 946     ptyip = ptyibuf2;
 947     pcc = strlen(ptyip);
 948
 949     DIAG(TD_REPORT, {
 950         output_data("td: Entering processing loop\r\n");
 951     });
 952
 953
 954     nfd = ((f > p) ? f : p) + 1;
 955     timeout = time(NULL) + 5;
 956     for (;;) {
 957         fd_set ibits, obits, xbits;
 958         int c;
 959
 960         /* wait for encryption to be turned on, but don't wait
 961            indefinitely */
 962         if(!startslave_called && (!encrypt_delay() || timeout > time(NULL))){
 963             startslave_called = 1;
 964             startslave(host, level, autoname);
 965         }
 966
 967         if (ncc < 0 && pcc < 0)
 968             break;
 969
 970         FD_ZERO(&ibits);
 971         FD_ZERO(&obits);
 972         FD_ZERO(&xbits);
 973         /*
 974          * Never look for input if there's still
 975          * stuff in the corresponding output buffer
 976          */
 977         if (nfrontp - nbackp || pcc > 0) {
 978             FD_SET(f, &obits);
 979         } else {
 980             FD_SET(p, &ibits);
 981         }
 982         if (pfrontp - pbackp || ncc > 0) {
 983             FD_SET(p, &obits);
 984         } else {
 985             FD_SET(f, &ibits);
 986         }
 987         if (!SYNCHing) {
 988             FD_SET(f, &xbits);
 989         }
 990         if ((c = select(nfd, &ibits, &obits, &xbits,
 991                         (struct timeval *)0)) < 1) {
 992             if (c == -1) {
 993                 if (errno == EINTR) {
 994                     continue;
 995                 }
 996             }
 997             sleep(5);
 998             continue;
 999         }
1000
1001         /*
1002          * Any urgent data?
1003          */
1004         if (FD_ISSET(net, &xbits)) {
1005             SYNCHing = 1;
1006         }
1007
1008         /*
1009          * Something to read from the network...
1010          */
1011         if (FD_ISSET(net, &ibits)) {
1012 #ifndef SO_OOBINLINE
1013             /*
1014              * In 4.2 (and 4.3 beta) systems, the
1015              * OOB indication and data handling in the kernel
1016              * is such that if two separate TCP Urgent requests
1017              * come in, one byte of TCP data will be overlaid.
1018              * This is fatal for Telnet, but we try to live
1019              * with it.
1020              *
1021              * In addition, in 4.2 (and...), a special protocol
1022              * is needed to pick up the TCP Urgent data in
1023              * the correct sequence.
1024              *
1025              * What we do is:  if we think we are in urgent
1026              * mode, we look to see if we are "at the mark".
1027              * If we are, we do an OOB receive.  If we run
1028              * this twice, we will do the OOB receive twice,
1029              * but the second will fail, since the second
1030              * time we were "at the mark", but there wasn't
1031              * any data there (the kernel doesn't reset
1032              * "at the mark" until we do a normal read).
1033              * Once we've read the OOB data, we go ahead
1034              * and do normal reads.
1035              *
1036              * There is also another problem, which is that
1037              * since the OOB byte we read doesn't put us
1038              * out of OOB state, and since that byte is most
1039              * likely the TELNET DM (data mark), we would
1040              * stay in the TELNET SYNCH (SYNCHing) state.
1041              * So, clocks to the rescue.  If we've "just"
1042              * received a DM, then we test for the
1043              * presence of OOB data when the receive OOB
1044              * fails (and AFTER we did the normal mode read
1045              * to clear "at the mark").
1046              */
1047             if (SYNCHing) {
1048                 int atmark;
1049
1050                 ioctl(net, SIOCATMARK, (char *)&atmark);
1051                 if (atmark) {
1052                     ncc = recv(net, netibuf, sizeof (netibuf), MSG_OOB);
1053                     if ((ncc == -1) && (errno == EINVAL)) {
1054                         ncc = read(net, netibuf, sizeof (netibuf));
1055                         if (sequenceIs(didnetreceive, gotDM)) {
1056                             SYNCHing = stilloob(net);
1057                         }
1058                     }
1059                 } else {
1060                     ncc = read(net, netibuf, sizeof (netibuf));
1061                 }
1062             } else {
1063                 ncc = read(net, netibuf, sizeof (netibuf));
1064             }
1065             settimer(didnetreceive);
1066 #else   /* !defined(SO_OOBINLINE)) */
1067             ncc = read(net, netibuf, sizeof (netibuf));
1068 #endif  /* !defined(SO_OOBINLINE)) */
1069             if (ncc < 0 && errno == EWOULDBLOCK)
1070                 ncc = 0;
1071             else {
1072                 if (ncc <= 0) {
1073                     break;
1074                 }
1075                 netip = netibuf;
1076             }
1077             DIAG((TD_REPORT | TD_NETDATA), {
1078                 output_data("td: netread %d chars\r\n", ncc);
1079                 });
1080             DIAG(TD_NETDATA, printdata("nd", netip, ncc));
1081         }
1082
1083         /*
1084          * Something to read from the pty...
1085          */
1086         if (FD_ISSET(p, &ibits)) {
1087 #ifdef STREAMSPTY
1088             if (really_stream)
1089                 pcc = readstream(p, ptyibuf, BUFSIZ);
1090             else
1091 #endif
1092                 pcc = read(p, ptyibuf, BUFSIZ);
1093
1094             /*
1095              * On some systems, if we try to read something
1096              * off the master side before the slave side is
1097              * opened, we get EIO.
1098              */
1099             if (pcc < 0 && (errno == EWOULDBLOCK ||
1100 #ifdef  EAGAIN
1101                             errno == EAGAIN ||
1102 #endif
1103                             errno == EIO)) {
1104                 pcc = 0;
1105             } else {
1106                 if (pcc <= 0)
1107                     break;
1108                 if (ptyibuf[0] & TIOCPKT_FLUSHWRITE) {
1109                     netclear(); /* clear buffer back */
1110 #ifndef NO_URGENT
1111                     /*
1112                      * There are client telnets on some
1113                      * operating systems get screwed up
1114                      * royally if we send them urgent
1115                      * mode data.
1116                      */
1117                     output_data ("%c%c", IAC, DM);
1118
1119                     neturg = nfrontp-1; /* off by one XXX */
1120                     DIAG(TD_OPTIONS,
1121                          printoption("td: send IAC", DM));
1122
1123 #endif
1124                 }
1125                 if (his_state_is_will(TELOPT_LFLOW) &&
1126                     (ptyibuf[0] &
1127                      (TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) {
1128                     int newflow =
1129                         ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0;
1130                     if (newflow != flowmode) {
1131                         flowmode = newflow;
1132                         output_data("%c%c%c%c%c%c",
1133                                     IAC, SB, TELOPT_LFLOW,
1134                                     flowmode ? LFLOW_ON
1135                                     : LFLOW_OFF,
1136                                     IAC, SE);
1137                         DIAG(TD_OPTIONS, printsub('>',
1138                                                   (unsigned char *)nfrontp-4,
1139                                                   4););
1140                     }
1141                 }
1142                 pcc--;
1143                 ptyip = ptyibuf+1;
1144             }
1145         }
1146
1147         while (pcc > 0) {
1148             if ((&netobuf[BUFSIZ] - nfrontp) < 3)
1149                 break;
1150             c = *ptyip++ & 0377, pcc--;
1151             if (c == IAC)
1152                 *nfrontp++ = c;
1153             *nfrontp++ = c;
1154             if ((c == '\r') && (my_state_is_wont(TELOPT_BINARY))) {
1155                 if (pcc > 0 && ((*ptyip & 0377) == '\n')) {
1156                     *nfrontp++ = *ptyip++ & 0377;
1157                     pcc--;
1158                 } else
1159                     *nfrontp++ = '\0';
1160             }
1161         }
1162
1163         if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0)
1164             netflush();
1165         if (ncc > 0)
1166             telrcv();
1167         if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0)
1168             ptyflush();
1169     }
1170     cleanup(0);
1171 }
1172
1173 #ifndef TCSIG
1174 # ifdef TIOCSIG
1175 #  define TCSIG TIOCSIG
1176 # endif
1177 #endif
1178
1179 #ifdef  STREAMSPTY
1180
1181     int flowison = -1;  /* current state of flow: -1 is unknown */
1182
1183 int
1184 readstream(int p, char *ibuf, int bufsize)
1185 {
1186     int flags = 0;
1187     int ret = 0;
1188     struct termios *tsp;
1189 #if 0
1190     struct termio *tp;
1191 #endif
1192     struct iocblk *ip;
1193     char vstop, vstart;
1194     int ixon;
1195     int newflow;
1196
1197     strbufc.maxlen = BUFSIZ;
1198     strbufc.buf = (char *)ctlbuf;
1199     strbufd.maxlen = bufsize-1;
1200     strbufd.len = 0;
1201     strbufd.buf = ibuf+1;
1202     ibuf[0] = 0;
1203
1204     ret = getmsg(p, &strbufc, &strbufd, &flags);
1205     if (ret < 0)  /* error of some sort -- probably EAGAIN */
1206         return(-1);
1207
1208     if (strbufc.len <= 0 || ctlbuf[0] == M_DATA) {
1209         /* data message */
1210         if (strbufd.len > 0) {                  /* real data */
1211             return(strbufd.len + 1);    /* count header char */
1212         } else {
1213             /* nothing there */
1214             errno = EAGAIN;
1215             return(-1);
1216         }
1217     }
1218
1219     /*
1220      * It's a control message.  Return 1, to look at the flag we set
1221      */
1222
1223     switch (ctlbuf[0]) {
1224     case M_FLUSH:
1225         if (ibuf[1] & FLUSHW)
1226             ibuf[0] = TIOCPKT_FLUSHWRITE;
1227         return(1);
1228
1229     case M_IOCTL:
1230         ip = (struct iocblk *) (ibuf+1);
1231
1232         switch (ip->ioc_cmd) {
1233 #ifdef TCSETS
1234         case TCSETS:
1235         case TCSETSW:
1236         case TCSETSF:
1237             tsp = (struct termios *)
1238                 (ibuf+1 + sizeof(struct iocblk));
1239             vstop = tsp->c_cc[VSTOP];
1240             vstart = tsp->c_cc[VSTART];
1241             ixon = tsp->c_iflag & IXON;
1242             break;
1243 #endif
1244 #if 0
1245         case TCSETA:
1246         case TCSETAW:
1247         case TCSETAF:
1248             tp = (struct termio *) (ibuf+1 + sizeof(struct iocblk));
1249             vstop = tp->c_cc[VSTOP];
1250             vstart = tp->c_cc[VSTART];
1251             ixon = tp->c_iflag & IXON;
1252             break;
1253 #endif
1254         default:
1255             errno = EAGAIN;
1256             return(-1);
1257         }
1258
1259         newflow =  (ixon && (vstart == 021) && (vstop == 023)) ? 1 : 0;
1260         if (newflow != flowison) {  /* it's a change */
1261             flowison = newflow;
1262             ibuf[0] = newflow ? TIOCPKT_DOSTOP : TIOCPKT_NOSTOP;
1263             return(1);
1264         }
1265     }
1266
1267     /* nothing worth doing anything about */
1268     errno = EAGAIN;
1269     return(-1);
1270 }
1271 #endif /* STREAMSPTY */
1272
1273 /*
1274  * Send interrupt to process on other side of pty.
1275  * If it is in raw mode, just write NULL;
1276  * otherwise, write intr char.
1277  */
1278 void
1279 interrupt()
1280 {
1281     ptyflush(); /* half-hearted */
1282
1283 #if defined(STREAMSPTY) && defined(TIOCSIGNAL)
1284     /* Streams PTY style ioctl to post a signal */
1285     if (really_stream)
1286         {
1287             int sig = SIGINT;
1288             ioctl(ourpty, TIOCSIGNAL, &sig);
1289             ioctl(ourpty, I_FLUSH, FLUSHR);
1290         }
1291 #else
1292 #ifdef  TCSIG
1293     ioctl(ourpty, TCSIG, (char *)SIGINT);
1294 #else   /* TCSIG */
1295     init_termbuf();
1296     *pfrontp++ = slctab[SLC_IP].sptr ?
1297         (unsigned char)*slctab[SLC_IP].sptr : '\177';
1298 #endif  /* TCSIG */
1299 #endif
1300 }
1301
1302 /*
1303  * Send quit to process on other side of pty.
1304  * If it is in raw mode, just write NULL;
1305  * otherwise, write quit char.
1306  */
1307 void
1308 sendbrk()
1309 {
1310     ptyflush(); /* half-hearted */
1311 #ifdef  TCSIG
1312     ioctl(ourpty, TCSIG, (char *)SIGQUIT);
1313 #else   /* TCSIG */
1314     init_termbuf();
1315     *pfrontp++ = slctab[SLC_ABORT].sptr ?
1316         (unsigned char)*slctab[SLC_ABORT].sptr : '\034';
1317 #endif  /* TCSIG */
1318 }
1319
1320 void
1321 sendsusp()
1322 {
1323 #ifdef  SIGTSTP
1324     ptyflush(); /* half-hearted */
1325 # ifdef TCSIG
1326     ioctl(ourpty, TCSIG, (char *)SIGTSTP);
1327 # else  /* TCSIG */
1328     *pfrontp++ = slctab[SLC_SUSP].sptr ?
1329         (unsigned char)*slctab[SLC_SUSP].sptr : '\032';
1330 # endif /* TCSIG */
1331 #endif  /* SIGTSTP */
1332 }
1333
1334 /*
1335  * When we get an AYT, if ^T is enabled, use that.  Otherwise,
1336  * just send back "[Yes]".
1337  */
1338 void
1339 recv_ayt()
1340 {
1341 #if     defined(SIGINFO) && defined(TCSIG)
1342     if (slctab[SLC_AYT].sptr && *slctab[SLC_AYT].sptr != _POSIX_VDISABLE) {
1343         ioctl(ourpty, TCSIG, (char *)SIGINFO);
1344         return;
1345     }
1346 #endif
1347     output_data("\r\n[Yes]\r\n");
1348 }
1349
1350 void
1351 doeof()
1352 {
1353     init_termbuf();
1354
1355     *pfrontp++ = slctab[SLC_EOF].sptr ?
1356         (unsigned char)*slctab[SLC_EOF].sptr : '\004';
1357 }