contrib/telnet/telnetd/sys_term.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 #if 0
  35 #ifndef lint
  36 static const char sccsid[] = "@(#)sys_term.c    8.4+1 (Berkeley) 5/30/95";
  37 #endif
  38 #endif
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD$");
  41
  42 #include <sys/types.h>
  43 #include <sys/tty.h>
  44 #include <libutil.h>
  45 #include <stdlib.h>
  46 #include <utmp.h>
  47
  48 #include "telnetd.h"
  49 #include "pathnames.h"
  50
  51 #ifdef  AUTHENTICATION
  52 #include <libtelnet/auth.h>
  53 #endif
  54
  55 int cleanopen(char *);
  56 void scrub_env(void);
  57
  58 struct  utmp wtmp;
  59
  60 #ifdef _PATH_WTMP
  61 char    wtmpf[] = _PATH_WTMP;
  62 #else
  63 char    wtmpf[] = "/var/log/wtmp";
  64 #endif
  65 #ifdef _PATH_UTMP
  66 char    utmpf[] = _PATH_UTMP;
  67 #else
  68 char    utmpf[] = "/var/run/utmp";
  69 #endif
  70
  71 char    *envinit[3];
  72 extern char **environ;
  73
  74 #define SCPYN(a, b)     (void) strncpy(a, b, sizeof(a))
  75 #define SCMPN(a, b)     strncmp(a, b, sizeof(a))
  76
  77 #ifdef  t_erase
  78 #undef  t_erase
  79 #undef  t_kill
  80 #undef  t_intrc
  81 #undef  t_quitc
  82 #undef  t_startc
  83 #undef  t_stopc
  84 #undef  t_eofc
  85 #undef  t_brkc
  86 #undef  t_suspc
  87 #undef  t_dsuspc
  88 #undef  t_rprntc
  89 #undef  t_flushc
  90 #undef  t_werasc
  91 #undef  t_lnextc
  92 #endif
  93
  94 #ifndef USE_TERMIO
  95 struct termbuf {
  96         struct sgttyb sg;
  97         struct tchars tc;
  98         struct ltchars ltc;
  99         int state;
 100         int lflags;
 101 } termbuf, termbuf2;
 102 # define        cfsetospeed(tp, val)    (tp)->sg.sg_ospeed = (val)
 103 # define        cfsetispeed(tp, val)    (tp)->sg.sg_ispeed = (val)
 104 # define        cfgetospeed(tp)         (tp)->sg.sg_ospeed
 105 # define        cfgetispeed(tp)         (tp)->sg.sg_ispeed
 106 #else   /* USE_TERMIO */
 107 # ifndef        TCSANOW
 108 #  ifdef TCSETS
 109 #   define      TCSANOW         TCSETS
 110 #   define      TCSADRAIN       TCSETSW
 111 #   define      tcgetattr(f, t) ioctl(f, TCGETS, (char *)t)
 112 #  else
 113 #   ifdef TCSETA
 114 #    define     TCSANOW         TCSETA
 115 #    define     TCSADRAIN       TCSETAW
 116 #    define     tcgetattr(f, t) ioctl(f, TCGETA, (char *)t)
 117 #   else
 118 #    define     TCSANOW         TIOCSETA
 119 #    define     TCSADRAIN       TIOCSETAW
 120 #    define     tcgetattr(f, t) ioctl(f, TIOCGETA, (char *)t)
 121 #   endif
 122 #  endif
 123 #  define       tcsetattr(f, a, t)      ioctl(f, a, t)
 124 #  define       cfsetospeed(tp, val)    (tp)->c_cflag &= ~CBAUD; \
 125                                         (tp)->c_cflag |= (val)
 126 #  define       cfgetospeed(tp)         ((tp)->c_cflag & CBAUD)
 127 #  ifdef CIBAUD
 128 #   define      cfsetispeed(tp, val)    (tp)->c_cflag &= ~CIBAUD; \
 129                                         (tp)->c_cflag |= ((val)<<IBSHIFT)
 130 #   define      cfgetispeed(tp)         (((tp)->c_cflag & CIBAUD)>>IBSHIFT)
 131 #  else
 132 #   define      cfsetispeed(tp, val)    (tp)->c_cflag &= ~CBAUD; \
 133                                         (tp)->c_cflag |= (val)
 134 #   define      cfgetispeed(tp)         ((tp)->c_cflag & CBAUD)
 135 #  endif
 136 # endif /* TCSANOW */
 137 struct termios termbuf, termbuf2;       /* pty control structure */
 138 #endif  /* USE_TERMIO */
 139
 140 #include <sys/types.h>
 141 #include <libutil.h>
 142
 143 int cleanopen(char *);
 144 void scrub_env(void);
 145 static char **addarg(char **, const char *);
 146
 147 /*
 148  * init_termbuf()
 149  * copy_termbuf(cp)
 150  * set_termbuf()
 151  *
 152  * These three routines are used to get and set the "termbuf" structure
 153  * to and from the kernel.  init_termbuf() gets the current settings.
 154  * copy_termbuf() hands in a new "termbuf" to write to the kernel, and
 155  * set_termbuf() writes the structure into the kernel.
 156  */
 157
 158 void
 159 init_termbuf(void)
 160 {
 161 #ifndef USE_TERMIO
 162         (void) ioctl(pty, TIOCGETP, (char *)&termbuf.sg);
 163         (void) ioctl(pty, TIOCGETC, (char *)&termbuf.tc);
 164         (void) ioctl(pty, TIOCGLTC, (char *)&termbuf.ltc);
 165 # ifdef TIOCGSTATE
 166         (void) ioctl(pty, TIOCGSTATE, (char *)&termbuf.state);
 167 # endif
 168 #else
 169         (void) tcgetattr(pty, &termbuf);
 170 #endif
 171         termbuf2 = termbuf;
 172 }
 173
 174 #if     defined(LINEMODE) && defined(TIOCPKT_IOCTL)
 175 void
 176 copy_termbuf(char *cp, size_t len)
 177 {
 178         if (len > sizeof(termbuf))
 179                 len = sizeof(termbuf);
 180         memmove((char *)&termbuf, cp, len);
 181         termbuf2 = termbuf;
 182 }
 183 #endif  /* defined(LINEMODE) && defined(TIOCPKT_IOCTL) */
 184
 185 void
 186 set_termbuf(void)
 187 {
 188         /*
 189          * Only make the necessary changes.
 190          */
 191 #ifndef USE_TERMIO
 192         if (memcmp((char *)&termbuf.sg, (char *)&termbuf2.sg,
 193                                                         sizeof(termbuf.sg)))
 194                 (void) ioctl(pty, TIOCSETN, (char *)&termbuf.sg);
 195         if (memcmp((char *)&termbuf.tc, (char *)&termbuf2.tc,
 196                                                         sizeof(termbuf.tc)))
 197                 (void) ioctl(pty, TIOCSETC, (char *)&termbuf.tc);
 198         if (memcmp((char *)&termbuf.ltc, (char *)&termbuf2.ltc,
 199                                                         sizeof(termbuf.ltc)))
 200                 (void) ioctl(pty, TIOCSLTC, (char *)&termbuf.ltc);
 201         if (termbuf.lflags != termbuf2.lflags)
 202                 (void) ioctl(pty, TIOCLSET, (char *)&termbuf.lflags);
 203 #else   /* USE_TERMIO */
 204         if (memcmp((char *)&termbuf, (char *)&termbuf2, sizeof(termbuf)))
 205                 (void) tcsetattr(pty, TCSANOW, &termbuf);
 206 #endif  /* USE_TERMIO */
 207 }
 208
 209
 210 /*
 211  * spcset(func, valp, valpp)
 212  *
 213  * This function takes various special characters (func), and
 214  * sets *valp to the current value of that character, and
 215  * *valpp to point to where in the "termbuf" structure that
 216  * value is kept.
 217  *
 218  * It returns the SLC_ level of support for this function.
 219  */
 220
 221 #ifndef USE_TERMIO
 222 int
 223 spcset(int func, cc_t *valp, cc_t **valpp)
 224 {
 225         switch(func) {
 226         case SLC_EOF:
 227                 *valp = termbuf.tc.t_eofc;
 228                 *valpp = (cc_t *)&termbuf.tc.t_eofc;
 229                 return(SLC_VARIABLE);
 230         case SLC_EC:
 231                 *valp = termbuf.sg.sg_erase;
 232                 *valpp = (cc_t *)&termbuf.sg.sg_erase;
 233                 return(SLC_VARIABLE);
 234         case SLC_EL:
 235                 *valp = termbuf.sg.sg_kill;
 236                 *valpp = (cc_t *)&termbuf.sg.sg_kill;
 237                 return(SLC_VARIABLE);
 238         case SLC_IP:
 239                 *valp = termbuf.tc.t_intrc;
 240                 *valpp = (cc_t *)&termbuf.tc.t_intrc;
 241                 return(SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
 242         case SLC_ABORT:
 243                 *valp = termbuf.tc.t_quitc;
 244                 *valpp = (cc_t *)&termbuf.tc.t_quitc;
 245                 return(SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
 246         case SLC_XON:
 247                 *valp = termbuf.tc.t_startc;
 248                 *valpp = (cc_t *)&termbuf.tc.t_startc;
 249                 return(SLC_VARIABLE);
 250         case SLC_XOFF:
 251                 *valp = termbuf.tc.t_stopc;
 252                 *valpp = (cc_t *)&termbuf.tc.t_stopc;
 253                 return(SLC_VARIABLE);
 254         case SLC_AO:
 255                 *valp = termbuf.ltc.t_flushc;
 256                 *valpp = (cc_t *)&termbuf.ltc.t_flushc;
 257                 return(SLC_VARIABLE);
 258         case SLC_SUSP:
 259                 *valp = termbuf.ltc.t_suspc;
 260                 *valpp = (cc_t *)&termbuf.ltc.t_suspc;
 261                 return(SLC_VARIABLE);
 262         case SLC_EW:
 263                 *valp = termbuf.ltc.t_werasc;
 264                 *valpp = (cc_t *)&termbuf.ltc.t_werasc;
 265                 return(SLC_VARIABLE);
 266         case SLC_RP:
 267                 *valp = termbuf.ltc.t_rprntc;
 268                 *valpp = (cc_t *)&termbuf.ltc.t_rprntc;
 269                 return(SLC_VARIABLE);
 270         case SLC_LNEXT:
 271                 *valp = termbuf.ltc.t_lnextc;
 272                 *valpp = (cc_t *)&termbuf.ltc.t_lnextc;
 273                 return(SLC_VARIABLE);
 274         case SLC_FORW1:
 275                 *valp = termbuf.tc.t_brkc;
 276                 *valpp = (cc_t *)&termbuf.ltc.t_lnextc;
 277                 return(SLC_VARIABLE);
 278         case SLC_BRK:
 279         case SLC_SYNCH:
 280         case SLC_AYT:
 281         case SLC_EOR:
 282                 *valp = (cc_t)0;
 283                 *valpp = (cc_t *)0;
 284                 return(SLC_DEFAULT);
 285         default:
 286                 *valp = (cc_t)0;
 287                 *valpp = (cc_t *)0;
 288                 return(SLC_NOSUPPORT);
 289         }
 290 }
 291
 292 #else   /* USE_TERMIO */
 293
 294
 295 #define setval(a, b)    *valp = termbuf.c_cc[a]; \
 296                         *valpp = &termbuf.c_cc[a]; \
 297                         return(b);
 298 #define defval(a) *valp = ((cc_t)a); *valpp = (cc_t *)0; return(SLC_DEFAULT);
 299
 300 int
 301 spcset(int func, cc_t *valp, cc_t **valpp)
 302 {
 303         switch(func) {
 304         case SLC_EOF:
 305                 setval(VEOF, SLC_VARIABLE);
 306         case SLC_EC:
 307                 setval(VERASE, SLC_VARIABLE);
 308         case SLC_EL:
 309                 setval(VKILL, SLC_VARIABLE);
 310         case SLC_IP:
 311                 setval(VINTR, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
 312         case SLC_ABORT:
 313                 setval(VQUIT, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
 314         case SLC_XON:
 315 #ifdef  VSTART
 316                 setval(VSTART, SLC_VARIABLE);
 317 #else
 318                 defval(0x13);
 319 #endif
 320         case SLC_XOFF:
 321 #ifdef  VSTOP
 322                 setval(VSTOP, SLC_VARIABLE);
 323 #else
 324                 defval(0x11);
 325 #endif
 326         case SLC_EW:
 327 #ifdef  VWERASE
 328                 setval(VWERASE, SLC_VARIABLE);
 329 #else
 330                 defval(0);
 331 #endif
 332         case SLC_RP:
 333 #ifdef  VREPRINT
 334                 setval(VREPRINT, SLC_VARIABLE);
 335 #else
 336                 defval(0);
 337 #endif
 338         case SLC_LNEXT:
 339 #ifdef  VLNEXT
 340                 setval(VLNEXT, SLC_VARIABLE);
 341 #else
 342                 defval(0);
 343 #endif
 344         case SLC_AO:
 345 #if     !defined(VDISCARD) && defined(VFLUSHO)
 346 # define VDISCARD VFLUSHO
 347 #endif
 348 #ifdef  VDISCARD
 349                 setval(VDISCARD, SLC_VARIABLE|SLC_FLUSHOUT);
 350 #else
 351                 defval(0);
 352 #endif
 353         case SLC_SUSP:
 354 #ifdef  VSUSP
 355                 setval(VSUSP, SLC_VARIABLE|SLC_FLUSHIN);
 356 #else
 357                 defval(0);
 358 #endif
 359 #ifdef  VEOL
 360         case SLC_FORW1:
 361                 setval(VEOL, SLC_VARIABLE);
 362 #endif
 363 #ifdef  VEOL2
 364         case SLC_FORW2:
 365                 setval(VEOL2, SLC_VARIABLE);
 366 #endif
 367         case SLC_AYT:
 368 #ifdef  VSTATUS
 369                 setval(VSTATUS, SLC_VARIABLE);
 370 #else
 371                 defval(0);
 372 #endif
 373
 374         case SLC_BRK:
 375         case SLC_SYNCH:
 376         case SLC_EOR:
 377                 defval(0);
 378
 379         default:
 380                 *valp = 0;
 381                 *valpp = 0;
 382                 return(SLC_NOSUPPORT);
 383         }
 384 }
 385 #endif  /* USE_TERMIO */
 386
 387 /*
 388  * getpty()
 389  *
 390  * Allocate a pty.  As a side effect, the external character
 391  * array "line" contains the name of the slave side.
 392  *
 393  * Returns the file descriptor of the opened pty.
 394  */
 395 char alpha[] = "0123456789abcdefghijklmnopqrstuv";
 396 char line[16];
 397
 398 int
 399 getpty(int *ptynum __unused)
 400 {
 401         int p;
 402         const char *cp;
 403         char *p1, *p2;
 404         int i;
 405
 406         (void) strcpy(line, _PATH_DEV);
 407         (void) strcat(line, "ptyXX");
 408         p1 = &line[8];
 409         p2 = &line[9];
 410
 411         for (cp = "pqrsPQRS"; *cp; cp++) {
 412                 struct stat stb;
 413
 414                 *p1 = *cp;
 415                 *p2 = '0';
 416                 /*
 417                  * This stat() check is just to keep us from
 418                  * looping through all 256 combinations if there
 419                  * aren't that many ptys available.
 420                  */
 421                 if (stat(line, &stb) < 0)
 422                         break;
 423                 for (i = 0; i < 32; i++) {
 424                         *p2 = alpha[i];
 425                         p = open(line, 2);
 426                         if (p > 0) {
 427                                 line[5] = 't';
 428                                 chown(line, 0, 0);
 429                                 chmod(line, 0600);
 430                                         return(p);
 431                         }
 432                 }
 433         }
 434         return(-1);
 435 }
 436
 437 #ifdef  LINEMODE
 438 /*
 439  * tty_flowmode()       Find out if flow control is enabled or disabled.
 440  * tty_linemode()       Find out if linemode (external processing) is enabled.
 441  * tty_setlinemod(on)   Turn on/off linemode.
 442  * tty_isecho()         Find out if echoing is turned on.
 443  * tty_setecho(on)      Enable/disable character echoing.
 444  * tty_israw()          Find out if terminal is in RAW mode.
 445  * tty_binaryin(on)     Turn on/off BINARY on input.
 446  * tty_binaryout(on)    Turn on/off BINARY on output.
 447  * tty_isediting()      Find out if line editing is enabled.
 448  * tty_istrapsig()      Find out if signal trapping is enabled.
 449  * tty_setedit(on)      Turn on/off line editing.
 450  * tty_setsig(on)       Turn on/off signal trapping.
 451  * tty_issofttab()      Find out if tab expansion is enabled.
 452  * tty_setsofttab(on)   Turn on/off soft tab expansion.
 453  * tty_islitecho()      Find out if typed control chars are echoed literally
 454  * tty_setlitecho()     Turn on/off literal echo of control chars
 455  * tty_tspeed(val)      Set transmit speed to val.
 456  * tty_rspeed(val)      Set receive speed to val.
 457  */
 458
 459
 460 int
 461 tty_linemode(void)
 462 {
 463 #ifndef USE_TERMIO
 464         return(termbuf.state & TS_EXTPROC);
 465 #else
 466         return(termbuf.c_lflag & EXTPROC);
 467 #endif
 468 }
 469
 470 void
 471 tty_setlinemode(int on)
 472 {
 473 #ifdef  TIOCEXT
 474         set_termbuf();
 475         (void) ioctl(pty, TIOCEXT, (char *)&on);
 476         init_termbuf();
 477 #else   /* !TIOCEXT */
 478 # ifdef EXTPROC
 479         if (on)
 480                 termbuf.c_lflag |= EXTPROC;
 481         else
 482                 termbuf.c_lflag &= ~EXTPROC;
 483 # endif
 484 #endif  /* TIOCEXT */
 485 }
 486 #endif  /* LINEMODE */
 487
 488 int
 489 tty_isecho(void)
 490 {
 491 #ifndef USE_TERMIO
 492         return (termbuf.sg.sg_flags & ECHO);
 493 #else
 494         return (termbuf.c_lflag & ECHO);
 495 #endif
 496 }
 497
 498 int
 499 tty_flowmode(void)
 500 {
 501 #ifndef USE_TERMIO
 502         return(((termbuf.tc.t_startc) > 0 && (termbuf.tc.t_stopc) > 0) ? 1 : 0);
 503 #else
 504         return((termbuf.c_iflag & IXON) ? 1 : 0);
 505 #endif
 506 }
 507
 508 int
 509 tty_restartany(void)
 510 {
 511 #ifndef USE_TERMIO
 512 # ifdef DECCTQ
 513         return((termbuf.lflags & DECCTQ) ? 0 : 1);
 514 # else
 515         return(-1);
 516 # endif
 517 #else
 518         return((termbuf.c_iflag & IXANY) ? 1 : 0);
 519 #endif
 520 }
 521
 522 void
 523 tty_setecho(int on)
 524 {
 525 #ifndef USE_TERMIO
 526         if (on)
 527                 termbuf.sg.sg_flags |= ECHO|CRMOD;
 528         else
 529                 termbuf.sg.sg_flags &= ~(ECHO|CRMOD);
 530 #else
 531         if (on)
 532                 termbuf.c_lflag |= ECHO;
 533         else
 534                 termbuf.c_lflag &= ~ECHO;
 535 #endif
 536 }
 537
 538 int
 539 tty_israw(void)
 540 {
 541 #ifndef USE_TERMIO
 542         return(termbuf.sg.sg_flags & RAW);
 543 #else
 544         return(!(termbuf.c_lflag & ICANON));
 545 #endif
 546 }
 547
 548 #ifdef  AUTHENTICATION
 549 #if     defined(NO_LOGIN_F) && defined(LOGIN_R)
 550 int
 551 tty_setraw(int on)
 552 {
 553 #  ifndef USE_TERMIO
 554         if (on)
 555                 termbuf.sg.sg_flags |= RAW;
 556         else
 557                 termbuf.sg.sg_flags &= ~RAW;
 558 #  else
 559         if (on)
 560                 termbuf.c_lflag &= ~ICANON;
 561         else
 562                 termbuf.c_lflag |= ICANON;
 563 #  endif
 564 }
 565 #endif
 566 #endif /* AUTHENTICATION */
 567
 568 void
 569 tty_binaryin(int on)
 570 {
 571 #ifndef USE_TERMIO
 572         if (on)
 573                 termbuf.lflags |= LPASS8;
 574         else
 575                 termbuf.lflags &= ~LPASS8;
 576 #else
 577         if (on) {
 578                 termbuf.c_iflag &= ~ISTRIP;
 579         } else {
 580                 termbuf.c_iflag |= ISTRIP;
 581         }
 582 #endif
 583 }
 584
 585 void
 586 tty_binaryout(int on)
 587 {
 588 #ifndef USE_TERMIO
 589         if (on)
 590                 termbuf.lflags |= LLITOUT;
 591         else
 592                 termbuf.lflags &= ~LLITOUT;
 593 #else
 594         if (on) {
 595                 termbuf.c_cflag &= ~(CSIZE|PARENB);
 596                 termbuf.c_cflag |= CS8;
 597                 termbuf.c_oflag &= ~OPOST;
 598         } else {
 599                 termbuf.c_cflag &= ~CSIZE;
 600                 termbuf.c_cflag |= CS7|PARENB;
 601                 termbuf.c_oflag |= OPOST;
 602         }
 603 #endif
 604 }
 605
 606 int
 607 tty_isbinaryin(void)
 608 {
 609 #ifndef USE_TERMIO
 610         return(termbuf.lflags & LPASS8);
 611 #else
 612         return(!(termbuf.c_iflag & ISTRIP));
 613 #endif
 614 }
 615
 616 int
 617 tty_isbinaryout(void)
 618 {
 619 #ifndef USE_TERMIO
 620         return(termbuf.lflags & LLITOUT);
 621 #else
 622         return(!(termbuf.c_oflag&OPOST));
 623 #endif
 624 }
 625
 626 #ifdef  LINEMODE
 627 int
 628 tty_isediting(void)
 629 {
 630 #ifndef USE_TERMIO
 631         return(!(termbuf.sg.sg_flags & (CBREAK|RAW)));
 632 #else
 633         return(termbuf.c_lflag & ICANON);
 634 #endif
 635 }
 636
 637 int
 638 tty_istrapsig(void)
 639 {
 640 #ifndef USE_TERMIO
 641         return(!(termbuf.sg.sg_flags&RAW));
 642 #else
 643         return(termbuf.c_lflag & ISIG);
 644 #endif
 645 }
 646
 647 void
 648 tty_setedit(int on)
 649 {
 650 #ifndef USE_TERMIO
 651         if (on)
 652                 termbuf.sg.sg_flags &= ~CBREAK;
 653         else
 654                 termbuf.sg.sg_flags |= CBREAK;
 655 #else
 656         if (on)
 657                 termbuf.c_lflag |= ICANON;
 658         else
 659                 termbuf.c_lflag &= ~ICANON;
 660 #endif
 661 }
 662
 663 void
 664 tty_setsig(int on)
 665 {
 666 #ifndef USE_TERMIO
 667         if (on)
 668                 ;
 669 #else
 670         if (on)
 671                 termbuf.c_lflag |= ISIG;
 672         else
 673                 termbuf.c_lflag &= ~ISIG;
 674 #endif
 675 }
 676 #endif  /* LINEMODE */
 677
 678 int
 679 tty_issofttab(void)
 680 {
 681 #ifndef USE_TERMIO
 682         return (termbuf.sg.sg_flags & XTABS);
 683 #else
 684 # ifdef OXTABS
 685         return (termbuf.c_oflag & OXTABS);
 686 # endif
 687 # ifdef TABDLY
 688         return ((termbuf.c_oflag & TABDLY) == TAB3);
 689 # endif
 690 #endif
 691 }
 692
 693 void
 694 tty_setsofttab(int on)
 695 {
 696 #ifndef USE_TERMIO
 697         if (on)
 698                 termbuf.sg.sg_flags |= XTABS;
 699         else
 700                 termbuf.sg.sg_flags &= ~XTABS;
 701 #else
 702         if (on) {
 703 # ifdef OXTABS
 704                 termbuf.c_oflag |= OXTABS;
 705 # endif
 706 # ifdef TABDLY
 707                 termbuf.c_oflag &= ~TABDLY;
 708                 termbuf.c_oflag |= TAB3;
 709 # endif
 710         } else {
 711 # ifdef OXTABS
 712                 termbuf.c_oflag &= ~OXTABS;
 713 # endif
 714 # ifdef TABDLY
 715                 termbuf.c_oflag &= ~TABDLY;
 716                 termbuf.c_oflag |= TAB0;
 717 # endif
 718         }
 719 #endif
 720 }
 721
 722 int
 723 tty_islitecho(void)
 724 {
 725 #ifndef USE_TERMIO
 726         return (!(termbuf.lflags & LCTLECH));
 727 #else
 728 # ifdef ECHOCTL
 729         return (!(termbuf.c_lflag & ECHOCTL));
 730 # endif
 731 # ifdef TCTLECH
 732         return (!(termbuf.c_lflag & TCTLECH));
 733 # endif
 734 # if    !defined(ECHOCTL) && !defined(TCTLECH)
 735         return (0);     /* assumes ctl chars are echoed '^x' */
 736 # endif
 737 #endif
 738 }
 739
 740 void
 741 tty_setlitecho(int on)
 742 {
 743 #ifndef USE_TERMIO
 744         if (on)
 745                 termbuf.lflags &= ~LCTLECH;
 746         else
 747                 termbuf.lflags |= LCTLECH;
 748 #else
 749 # ifdef ECHOCTL
 750         if (on)
 751                 termbuf.c_lflag &= ~ECHOCTL;
 752         else
 753                 termbuf.c_lflag |= ECHOCTL;
 754 # endif
 755 # ifdef TCTLECH
 756         if (on)
 757                 termbuf.c_lflag &= ~TCTLECH;
 758         else
 759                 termbuf.c_lflag |= TCTLECH;
 760 # endif
 761 #endif
 762 }
 763
 764 int
 765 tty_iscrnl(void)
 766 {
 767 #ifndef USE_TERMIO
 768         return (termbuf.sg.sg_flags & CRMOD);
 769 #else
 770         return (termbuf.c_iflag & ICRNL);
 771 #endif
 772 }
 773
 774 /*
 775  * Try to guess whether speeds are "encoded" (4.2BSD) or just numeric (4.4BSD).
 776  */
 777 #if B4800 != 4800
 778 #define DECODE_BAUD
 779 #endif
 780
 781 #ifdef  DECODE_BAUD
 782
 783 /*
 784  * A table of available terminal speeds
 785  */
 786 struct termspeeds {
 787         int     speed;
 788         int     value;
 789 } termspeeds[] = {
 790         { 0,      B0 },      { 50,    B50 },    { 75,     B75 },
 791         { 110,    B110 },    { 134,   B134 },   { 150,    B150 },
 792         { 200,    B200 },    { 300,   B300 },   { 600,    B600 },
 793         { 1200,   B1200 },   { 1800,  B1800 },  { 2400,   B2400 },
 794         { 4800,   B4800 },
 795 #ifdef  B7200
 796         { 7200,  B7200 },
 797 #endif
 798         { 9600,   B9600 },
 799 #ifdef  B14400
 800         { 14400,  B14400 },
 801 #endif
 802 #ifdef  B19200
 803         { 19200,  B19200 },
 804 #endif
 805 #ifdef  B28800
 806         { 28800,  B28800 },
 807 #endif
 808 #ifdef  B38400
 809         { 38400,  B38400 },
 810 #endif
 811 #ifdef  B57600
 812         { 57600,  B57600 },
 813 #endif
 814 #ifdef  B115200
 815         { 115200, B115200 },
 816 #endif
 817 #ifdef  B230400
 818         { 230400, B230400 },
 819 #endif
 820         { -1,     0 }
 821 };
 822 #endif  /* DECODE_BAUD */
 823
 824 void
 825 tty_tspeed(int val)
 826 {
 827 #ifdef  DECODE_BAUD
 828         struct termspeeds *tp;
 829
 830         for (tp = termspeeds; (tp->speed != -1) && (val > tp->speed); tp++)
 831                 ;
 832         if (tp->speed == -1)    /* back up to last valid value */
 833                 --tp;
 834         cfsetospeed(&termbuf, tp->value);
 835 #else   /* DECODE_BAUD */
 836         cfsetospeed(&termbuf, val);
 837 #endif  /* DECODE_BAUD */
 838 }
 839
 840 void
 841 tty_rspeed(int val)
 842 {
 843 #ifdef  DECODE_BAUD
 844         struct termspeeds *tp;
 845
 846         for (tp = termspeeds; (tp->speed != -1) && (val > tp->speed); tp++)
 847                 ;
 848         if (tp->speed == -1)    /* back up to last valid value */
 849                 --tp;
 850         cfsetispeed(&termbuf, tp->value);
 851 #else   /* DECODE_BAUD */
 852         cfsetispeed(&termbuf, val);
 853 #endif  /* DECODE_BAUD */
 854 }
 855
 856 /*
 857  * getptyslave()
 858  *
 859  * Open the slave side of the pty, and do any initialization
 860  * that is necessary.
 861  */
 862 static void
 863 getptyslave(void)
 864 {
 865         int t = -1;
 866         char erase;
 867
 868 # ifdef LINEMODE
 869         int waslm;
 870 # endif
 871 # ifdef TIOCGWINSZ
 872         struct winsize ws;
 873         extern int def_row, def_col;
 874 # endif
 875         extern int def_tspeed, def_rspeed;
 876         /*
 877          * Opening the slave side may cause initilization of the
 878          * kernel tty structure.  We need remember the state of
 879          *      if linemode was turned on
 880          *      terminal window size
 881          *      terminal speed
 882          *      erase character
 883          * so that we can re-set them if we need to.
 884          */
 885 # ifdef LINEMODE
 886         waslm = tty_linemode();
 887 # endif
 888         erase = termbuf.c_cc[VERASE];
 889
 890         /*
 891          * Make sure that we don't have a controlling tty, and
 892          * that we are the session (process group) leader.
 893          */
 894 # ifdef TIOCNOTTY
 895         t = open(_PATH_TTY, O_RDWR);
 896         if (t >= 0) {
 897                 (void) ioctl(t, TIOCNOTTY, (char *)0);
 898                 (void) close(t);
 899         }
 900 # endif
 901
 902         t = cleanopen(line);
 903         if (t < 0)
 904                 fatalperror(net, line);
 905
 906
 907         /*
 908          * set up the tty modes as we like them to be.
 909          */
 910         init_termbuf();
 911 # ifdef TIOCGWINSZ
 912         if (def_row || def_col) {
 913                 memset((char *)&ws, 0, sizeof(ws));
 914                 ws.ws_col = def_col;
 915                 ws.ws_row = def_row;
 916                 (void)ioctl(t, TIOCSWINSZ, (char *)&ws);
 917         }
 918 # endif
 919
 920         /*
 921          * Settings for sgtty based systems
 922          */
 923 # ifndef        USE_TERMIO
 924         termbuf.sg.sg_flags |= CRMOD|ANYP|ECHO|XTABS;
 925 # endif /* USE_TERMIO */
 926
 927         /*
 928          * Settings for all other termios/termio based
 929          * systems, other than 4.4BSD.  In 4.4BSD the
 930          * kernel does the initial terminal setup.
 931          */
 932         tty_rspeed((def_rspeed > 0) ? def_rspeed : 9600);
 933         tty_tspeed((def_tspeed > 0) ? def_tspeed : 9600);
 934         if (erase)
 935                 termbuf.c_cc[VERASE] = erase;
 936 # ifdef LINEMODE
 937         if (waslm)
 938                 tty_setlinemode(1);
 939 # endif /* LINEMODE */
 940
 941         /*
 942          * Set the tty modes, and make this our controlling tty.
 943          */
 944         set_termbuf();
 945         if (login_tty(t) == -1)
 946                 fatalperror(net, "login_tty");
 947         if (net > 2)
 948                 (void) close(net);
 949 #ifdef  AUTHENTICATION
 950 #if     defined(NO_LOGIN_F) && defined(LOGIN_R)
 951         /*
 952          * Leave the pty open so that we can write out the rlogin
 953          * protocol for /bin/login, if the authentication works.
 954          */
 955 #else
 956         if (pty > 2) {
 957                 (void) close(pty);
 958                 pty = -1;
 959         }
 960 #endif
 961 #endif /* AUTHENTICATION */
 962 }
 963
 964 #ifndef O_NOCTTY
 965 #define O_NOCTTY        0
 966 #endif
 967 /*
 968  * Open the specified slave side of the pty,
 969  * making sure that we have a clean tty.
 970  */
 971 int
 972 cleanopen(char *li)
 973 {
 974         int t;
 975
 976         /*
 977          * Make sure that other people can't open the
 978          * slave side of the connection.
 979          */
 980         (void) chown(li, 0, 0);
 981         (void) chmod(li, 0600);
 982
 983         (void) revoke(li);
 984
 985         t = open(line, O_RDWR|O_NOCTTY);
 986
 987         if (t < 0)
 988                 return(-1);
 989
 990         return(t);
 991 }
 992
 993 /*
 994  * startslave(host)
 995  *
 996  * Given a hostname, do whatever
 997  * is necessary to startup the login process on the slave side of the pty.
 998  */
 999
1000 /* ARGSUSED */
1001 void
1002 startslave(char *host, int autologin, char *autoname)
1003 {
1004         int i;
1005
1006 #ifdef  AUTHENTICATION
1007         if (!autoname || !autoname[0])
1008                 autologin = 0;
1009
1010         if (autologin < auth_level) {
1011                 fatal(net, "Authorization failed");
1012                 exit(1);
1013         }
1014 #endif
1015
1016
1017         if ((i = fork()) < 0)
1018                 fatalperror(net, "fork");
1019         if (i) {
1020         } else {
1021                 getptyslave();
1022                 start_login(host, autologin, autoname);
1023                 /*NOTREACHED*/
1024         }
1025 }
1026
1027 void
1028 init_env(void)
1029 {
1030         char **envp;
1031
1032         envp = envinit;
1033         if ((*envp = getenv("TZ")))
1034                 *envp++ -= 3;
1035         *envp = 0;
1036         environ = envinit;
1037 }
1038
1039
1040 /*
1041  * start_login(host)
1042  *
1043  * Assuming that we are now running as a child processes, this
1044  * function will turn us into the login process.
1045  */
1046
1047 #ifndef AUTHENTICATION
1048 #define undef1 __unused
1049 #else
1050 #define undef1
1051 #endif
1052
1053 void
1054 start_login(char *host undef1, int autologin undef1, char *name undef1)
1055 {
1056         char **argv;
1057
1058         scrub_env();
1059
1060         /*
1061          * -h : pass on name of host.
1062          *              WARNING:  -h is accepted by login if and only if
1063          *                      getuid() == 0.
1064          * -p : don't clobber the environment (so terminal type stays set).
1065          *
1066          * -f : force this login, he has already been authenticated
1067          */
1068         argv = addarg(0, "login");
1069
1070 #if     !defined(NO_LOGIN_H)
1071 #ifdef  AUTHENTICATION
1072 # if    defined(NO_LOGIN_F) && defined(LOGIN_R)
1073         /*
1074          * Don't add the "-h host" option if we are going
1075          * to be adding the "-r host" option down below...
1076          */
1077         if ((auth_level < 0) || (autologin != AUTH_VALID))
1078 # endif
1079         {
1080                 argv = addarg(argv, "-h");
1081                 argv = addarg(argv, host);
1082         }
1083 #endif /* AUTHENTICATION */
1084 #endif
1085 #if     !defined(NO_LOGIN_P)
1086         argv = addarg(argv, "-p");
1087 #endif
1088 #ifdef  LINEMODE
1089         /*
1090          * Set the environment variable "LINEMODE" to either
1091          * "real" or "kludge" if we are operating in either
1092          * real or kludge linemode.
1093          */
1094         if (lmodetype == REAL_LINEMODE)
1095                 setenv("LINEMODE", "real", 1);
1096 # ifdef KLUDGELINEMODE
1097         else if (lmodetype == KLUDGE_LINEMODE || lmodetype == KLUDGE_OK)
1098                 setenv("LINEMODE", "kludge", 1);
1099 # endif
1100 #endif
1101 #ifdef  BFTPDAEMON
1102         /*
1103          * Are we working as the bftp daemon?  If so, then ask login
1104          * to start bftp instead of shell.
1105          */
1106         if (bftpd) {
1107                 argv = addarg(argv, "-e");
1108                 argv = addarg(argv, BFTPPATH);
1109         } else
1110 #endif
1111 #ifdef  AUTHENTICATION
1112         if (auth_level >= 0 && autologin == AUTH_VALID) {
1113 # if    !defined(NO_LOGIN_F)
1114                 argv = addarg(argv, "-f");
1115                 argv = addarg(argv, "--");
1116                 argv = addarg(argv, name);
1117 # else
1118 #  if defined(LOGIN_R)
1119                 /*
1120                  * We don't have support for "login -f", but we
1121                  * can fool /bin/login into thinking that we are
1122                  * rlogind, and allow us to log in without a
1123                  * password.  The rlogin protocol expects
1124                  *      local-user\0remote-user\0term/speed\0
1125                  */
1126
1127                 if (pty > 2) {
1128                         char *cp;
1129                         char speed[128];
1130                         int isecho, israw, xpty, len;
1131                         extern int def_rspeed;
1132 #  ifndef LOGIN_HOST
1133                         /*
1134                          * Tell login that we are coming from "localhost".
1135                          * If we passed in the real host name, then the
1136                          * user would have to allow .rhost access from
1137                          * every machine that they want authenticated
1138                          * access to work from, which sort of defeats
1139                          * the purpose of an authenticated login...
1140                          * So, we tell login that the session is coming
1141                          * from "localhost", and the user will only have
1142                          * to have "localhost" in their .rhost file.
1143                          */
1144 #                       define LOGIN_HOST "localhost"
1145 #  endif
1146                         argv = addarg(argv, "-r");
1147                         argv = addarg(argv, LOGIN_HOST);
1148
1149                         xpty = pty;
1150                         pty = 0;
1151                         init_termbuf();
1152                         isecho = tty_isecho();
1153                         israw = tty_israw();
1154                         if (isecho || !israw) {
1155                                 tty_setecho(0);         /* Turn off echo */
1156                                 tty_setraw(1);          /* Turn on raw */
1157                                 set_termbuf();
1158                         }
1159                         len = strlen(name)+1;
1160                         write(xpty, name, len);
1161                         write(xpty, name, len);
1162                         snprintf(speed, sizeof(speed),
1163                                 "%s/%d", (cp = getenv("TERM")) ? cp : "",
1164                                 (def_rspeed > 0) ? def_rspeed : 9600);
1165                         len = strlen(speed)+1;
1166                         write(xpty, speed, len);
1167
1168                         if (isecho || !israw) {
1169                                 init_termbuf();
1170                                 tty_setecho(isecho);
1171                                 tty_setraw(israw);
1172                                 set_termbuf();
1173                                 if (!israw) {
1174                                         /*
1175                                          * Write a newline to ensure
1176                                          * that login will be able to
1177                                          * read the line...
1178                                          */
1179                                         write(xpty, "\n", 1);
1180                                 }
1181                         }
1182                         pty = xpty;
1183                 }
1184 #  else
1185                 argv = addarg(argv, "--");
1186                 argv = addarg(argv, name);
1187 #  endif
1188 # endif
1189         } else
1190 #endif
1191         if (getenv("USER")) {
1192                 argv = addarg(argv, "--");
1193                 argv = addarg(argv, getenv("USER"));
1194 #if     defined(LOGIN_ARGS) && defined(NO_LOGIN_P)
1195                 {
1196                         char **cpp;
1197                         for (cpp = environ; *cpp; cpp++)
1198                                 argv = addarg(argv, *cpp);
1199                 }
1200 #endif
1201                 /*
1202                  * Assume that login will set the USER variable
1203                  * correctly.  For SysV systems, this means that
1204                  * USER will no longer be set, just LOGNAME by
1205                  * login.  (The problem is that if the auto-login
1206                  * fails, and the user then specifies a different
1207                  * account name, he can get logged in with both
1208                  * LOGNAME and USER in his environment, but the
1209                  * USER value will be wrong.
1210                  */
1211                 unsetenv("USER");
1212         }
1213 #ifdef  AUTHENTICATION
1214 #if     defined(NO_LOGIN_F) && defined(LOGIN_R)
1215         if (pty > 2)
1216                 close(pty);
1217 #endif
1218 #endif /* AUTHENTICATION */
1219         closelog();
1220
1221         if (altlogin == NULL) {
1222                 altlogin = _PATH_LOGIN;
1223         }
1224         execv(altlogin, argv);
1225
1226         syslog(LOG_ERR, "%s: %m", altlogin);
1227         fatalperror(net, altlogin);
1228         /*NOTREACHED*/
1229 }
1230
1231 static char **
1232 addarg(char **argv, const char *val)
1233 {
1234         char **cpp;
1235
1236         if (argv == NULL) {
1237                 /*
1238                  * 10 entries, a leading length, and a null
1239                  */
1240                 argv = (char **)malloc(sizeof(*argv) * 12);
1241                 if (argv == NULL)
1242                         return(NULL);
1243                 *argv++ = (char *)10;
1244                 *argv = (char *)0;
1245         }
1246         for (cpp = argv; *cpp; cpp++)
1247                 ;
1248         if (cpp == &argv[(long)argv[-1]]) {
1249                 --argv;
1250                 *argv = (char *)((long)(*argv) + 10);
1251                 argv = (char **)realloc(argv, sizeof(*argv)*((long)(*argv) + 2));
1252                 if (argv == NULL)
1253                         return(NULL);
1254                 argv++;
1255                 cpp = &argv[(long)argv[-1] - 10];
1256         }
1257         *cpp++ = strdup(val);
1258         *cpp = 0;
1259         return(argv);
1260 }
1261
1262 /*
1263  * scrub_env()
1264  *
1265  * We only accept the environment variables listed below.
1266  */
1267 void
1268 scrub_env(void)
1269 {
1270         static const char *rej[] = {
1271                 "TERMCAP=/",
1272                 NULL
1273         };
1274
1275         static const char *acc[] = {
1276                 "XAUTH=", "XAUTHORITY=", "DISPLAY=",
1277                 "TERM=",
1278                 "EDITOR=",
1279                 "PAGER=",
1280                 "LOGNAME=",
1281                 "POSIXLY_CORRECT=",
1282                 "PRINTER=",
1283                 NULL
1284         };
1285
1286         char **cpp, **cpp2;
1287         const char **p;
1288
1289         for (cpp2 = cpp = environ; *cpp; cpp++) {
1290                 int reject_it = 0;
1291
1292                 for(p = rej; *p; p++)
1293                         if(strncmp(*cpp, *p, strlen(*p)) == 0) {
1294                                 reject_it = 1;
1295                                 break;
1296                         }
1297                 if (reject_it)
1298                         continue;
1299
1300                 for(p = acc; *p; p++)
1301                         if(strncmp(*cpp, *p, strlen(*p)) == 0)
1302                                 break;
1303                 if(*p != NULL)
1304                         *cpp2++ = *cpp;
1305         }
1306         *cpp2 = NULL;
1307 }
1308
1309 /*
1310  * cleanup()
1311  *
1312  * This is the routine to call when we are all through, to
1313  * clean up anything that needs to be cleaned up.
1314  */
1315 /* ARGSUSED */
1316 void
1317 cleanup(int sig __unused)
1318 {
1319         char *p;
1320         sigset_t mask;
1321
1322         p = line + sizeof(_PATH_DEV) - 1;
1323         /*
1324          * Block all signals before clearing the utmp entry.  We don't want to
1325          * be called again after calling logout() and then not add the wtmp
1326          * entry because of not finding the corresponding entry in utmp.
1327          */
1328         sigfillset(&mask);
1329         sigprocmask(SIG_SETMASK, &mask, NULL);
1330         if (logout(p))
1331                 logwtmp(p, "", "");
1332         (void)chmod(line, 0666);
1333         (void)chown(line, 0, 0);
1334         *p = 'p';
1335         (void)chmod(line, 0666);
1336         (void)chown(line, 0, 0);
1337         (void) shutdown(net, 2);
1338         _exit(1);
1339 }