crypto/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  * @(#)sys_term.c       8.4+1 (Berkeley) 5/30/95
  34  * $FreeBSD: src/crypto/telnet/telnetd/sys_term.c,v 1.7.2.5 2002/06/17 02:48:02 jmallett Exp $
  35  * $DragonFly: src/crypto/telnet/telnetd/sys_term.c,v 1.2 2003/06/17 04:24:37 dillon Exp $
  36  */
  37
  38 #include <sys/types.h>
  39 #include <sys/tty.h>
  40 #include <libutil.h>
  41 #include <stdlib.h>
  42 #include <utmp.h>
  43
  44 #include "telnetd.h"
  45 #include "pathnames.h"
  46
  47 #ifdef  AUTHENTICATION
  48 #include <libtelnet/auth.h>
  49 #endif
  50
  51 int cleanopen(char *);
  52 void scrub_env(void);
  53
  54 struct  utmp wtmp;
  55
  56 #ifdef _PATH_WTMP
  57 char    wtmpf[] = _PATH_WTMP;
  58 #else
  59 char    wtmpf[] = "/var/log/wtmp";
  60 #endif
  61 #ifdef _PATH_UTMP
  62 char    utmpf[] = _PATH_UTMP;
  63 #else
  64 char    utmpf[] = "/var/run/utmp";
  65 #endif
  66
  67 char    *envinit[3];
  68 extern char **environ;
  69
  70 #define SCPYN(a, b)     (void) strncpy(a, b, sizeof(a))
  71 #define SCMPN(a, b)     strncmp(a, b, sizeof(a))
  72
  73 #ifdef  t_erase
  74 #undef  t_erase
  75 #undef  t_kill
  76 #undef  t_intrc
  77 #undef  t_quitc
  78 #undef  t_startc
  79 #undef  t_stopc
  80 #undef  t_eofc
  81 #undef  t_brkc
  82 #undef  t_suspc
  83 #undef  t_dsuspc
  84 #undef  t_rprntc
  85 #undef  t_flushc
  86 #undef  t_werasc
  87 #undef  t_lnextc
  88 #endif
  89
  90 #ifndef USE_TERMIO
  91 struct termbuf {
  92         struct sgttyb sg;
  93         struct tchars tc;
  94         struct ltchars ltc;
  95         int state;
  96         int lflags;
  97 } termbuf, termbuf2;
  98 # define        cfsetospeed(tp, val)    (tp)->sg.sg_ospeed = (val)
  99 # define        cfsetispeed(tp, val)    (tp)->sg.sg_ispeed = (val)
 100 # define        cfgetospeed(tp)         (tp)->sg.sg_ospeed
 101 # define        cfgetispeed(tp)         (tp)->sg.sg_ispeed
 102 #else   /* USE_TERMIO */
 103 # ifndef        TCSANOW
 104 #  ifdef TCSETS
 105 #   define      TCSANOW         TCSETS
 106 #   define      TCSADRAIN       TCSETSW
 107 #   define      tcgetattr(f, t) ioctl(f, TCGETS, (char *)t)
 108 #  else
 109 #   ifdef TCSETA
 110 #    define     TCSANOW         TCSETA
 111 #    define     TCSADRAIN       TCSETAW
 112 #    define     tcgetattr(f, t) ioctl(f, TCGETA, (char *)t)
 113 #   else
 114 #    define     TCSANOW         TIOCSETA
 115 #    define     TCSADRAIN       TIOCSETAW
 116 #    define     tcgetattr(f, t) ioctl(f, TIOCGETA, (char *)t)
 117 #   endif
 118 #  endif
 119 #  define       tcsetattr(f, a, t)      ioctl(f, a, t)
 120 #  define       cfsetospeed(tp, val)    (tp)->c_cflag &= ~CBAUD; \
 121                                         (tp)->c_cflag |= (val)
 122 #  define       cfgetospeed(tp)         ((tp)->c_cflag & CBAUD)
 123 #  ifdef CIBAUD
 124 #   define      cfsetispeed(tp, val)    (tp)->c_cflag &= ~CIBAUD; \
 125                                         (tp)->c_cflag |= ((val)<<IBSHIFT)
 126 #   define      cfgetispeed(tp)         (((tp)->c_cflag & CIBAUD)>>IBSHIFT)
 127 #  else
 128 #   define      cfsetispeed(tp, val)    (tp)->c_cflag &= ~CBAUD; \
 129                                         (tp)->c_cflag |= (val)
 130 #   define      cfgetispeed(tp)         ((tp)->c_cflag & CBAUD)
 131 #  endif
 132 # endif /* TCSANOW */
 133 struct termios termbuf, termbuf2;       /* pty control structure */
 134 #endif  /* USE_TERMIO */
 135
 136 #include <sys/types.h>
 137 #include <libutil.h>
 138
 139 int cleanopen(char *);
 140 void scrub_env(void);
 141 static char **addarg(char **, const char *);
 142
 143 /*
 144  * init_termbuf()
 145  * copy_termbuf(cp)
 146  * set_termbuf()
 147  *
 148  * These three routines are used to get and set the "termbuf" structure
 149  * to and from the kernel.  init_termbuf() gets the current settings.
 150  * copy_termbuf() hands in a new "termbuf" to write to the kernel, and
 151  * set_termbuf() writes the structure into the kernel.
 152  */
 153
 154 void
 155 init_termbuf(void)
 156 {
 157 #ifndef USE_TERMIO
 158         (void) ioctl(pty, TIOCGETP, (char *)&termbuf.sg);
 159         (void) ioctl(pty, TIOCGETC, (char *)&termbuf.tc);
 160         (void) ioctl(pty, TIOCGLTC, (char *)&termbuf.ltc);
 161 # ifdef TIOCGSTATE
 162         (void) ioctl(pty, TIOCGSTATE, (char *)&termbuf.state);
 163 # endif
 164 #else
 165         (void) tcgetattr(pty, &termbuf);
 166 #endif
 167         termbuf2 = termbuf;
 168 }
 169
 170 #if     defined(LINEMODE) && defined(TIOCPKT_IOCTL)
 171 void
 172 copy_termbuf(char *cp, size_t len)
 173 {
 174         if (len > sizeof(termbuf))
 175                 len = sizeof(termbuf);
 176         memmove((char *)&termbuf, cp, len);
 177         termbuf2 = termbuf;
 178 }
 179 #endif  /* defined(LINEMODE) && defined(TIOCPKT_IOCTL) */
 180
 181 void
 182 set_termbuf(void)
 183 {
 184         /*
 185          * Only make the necessary changes.
 186          */
 187 #ifndef USE_TERMIO
 188         if (memcmp((char *)&termbuf.sg, (char *)&termbuf2.sg,
 189                                                         sizeof(termbuf.sg)))
 190                 (void) ioctl(pty, TIOCSETN, (char *)&termbuf.sg);
 191         if (memcmp((char *)&termbuf.tc, (char *)&termbuf2.tc,
 192                                                         sizeof(termbuf.tc)))
 193                 (void) ioctl(pty, TIOCSETC, (char *)&termbuf.tc);
 194         if (memcmp((char *)&termbuf.ltc, (char *)&termbuf2.ltc,
 195                                                         sizeof(termbuf.ltc)))
 196                 (void) ioctl(pty, TIOCSLTC, (char *)&termbuf.ltc);
 197         if (termbuf.lflags != termbuf2.lflags)
 198                 (void) ioctl(pty, TIOCLSET, (char *)&termbuf.lflags);
 199 #else   /* USE_TERMIO */
 200         if (memcmp((char *)&termbuf, (char *)&termbuf2, sizeof(termbuf)))
 201                 (void) tcsetattr(pty, TCSANOW, &termbuf);
 202 #endif  /* USE_TERMIO */
 203 }
 204
 205
 206 /*
 207  * spcset(func, valp, valpp)
 208  *
 209  * This function takes various special characters (func), and
 210  * sets *valp to the current value of that character, and
 211  * *valpp to point to where in the "termbuf" structure that
 212  * value is kept.
 213  *
 214  * It returns the SLC_ level of support for this function.
 215  */
 216
 217 #ifndef USE_TERMIO
 218 int
 219 spcset(int func, cc_t *valp, cc_t **valpp)
 220 {
 221         switch(func) {
 222         case SLC_EOF:
 223                 *valp = termbuf.tc.t_eofc;
 224                 *valpp = (cc_t *)&termbuf.tc.t_eofc;
 225                 return(SLC_VARIABLE);
 226         case SLC_EC:
 227                 *valp = termbuf.sg.sg_erase;
 228                 *valpp = (cc_t *)&termbuf.sg.sg_erase;
 229                 return(SLC_VARIABLE);
 230         case SLC_EL:
 231                 *valp = termbuf.sg.sg_kill;
 232                 *valpp = (cc_t *)&termbuf.sg.sg_kill;
 233                 return(SLC_VARIABLE);
 234         case SLC_IP:
 235                 *valp = termbuf.tc.t_intrc;
 236                 *valpp = (cc_t *)&termbuf.tc.t_intrc;
 237                 return(SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
 238         case SLC_ABORT:
 239                 *valp = termbuf.tc.t_quitc;
 240                 *valpp = (cc_t *)&termbuf.tc.t_quitc;
 241                 return(SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
 242         case SLC_XON:
 243                 *valp = termbuf.tc.t_startc;
 244                 *valpp = (cc_t *)&termbuf.tc.t_startc;
 245                 return(SLC_VARIABLE);
 246         case SLC_XOFF:
 247                 *valp = termbuf.tc.t_stopc;
 248                 *valpp = (cc_t *)&termbuf.tc.t_stopc;
 249                 return(SLC_VARIABLE);
 250         case SLC_AO:
 251                 *valp = termbuf.ltc.t_flushc;
 252                 *valpp = (cc_t *)&termbuf.ltc.t_flushc;
 253                 return(SLC_VARIABLE);
 254         case SLC_SUSP:
 255                 *valp = termbuf.ltc.t_suspc;
 256                 *valpp = (cc_t *)&termbuf.ltc.t_suspc;
 257                 return(SLC_VARIABLE);
 258         case SLC_EW:
 259                 *valp = termbuf.ltc.t_werasc;
 260                 *valpp = (cc_t *)&termbuf.ltc.t_werasc;
 261                 return(SLC_VARIABLE);
 262         case SLC_RP:
 263                 *valp = termbuf.ltc.t_rprntc;
 264                 *valpp = (cc_t *)&termbuf.ltc.t_rprntc;
 265                 return(SLC_VARIABLE);
 266         case SLC_LNEXT:
 267                 *valp = termbuf.ltc.t_lnextc;
 268                 *valpp = (cc_t *)&termbuf.ltc.t_lnextc;
 269                 return(SLC_VARIABLE);
 270         case SLC_FORW1:
 271                 *valp = termbuf.tc.t_brkc;
 272                 *valpp = (cc_t *)&termbuf.ltc.t_lnextc;
 273                 return(SLC_VARIABLE);
 274         case SLC_BRK:
 275         case SLC_SYNCH:
 276         case SLC_AYT:
 277         case SLC_EOR:
 278                 *valp = (cc_t)0;
 279                 *valpp = (cc_t *)0;
 280                 return(SLC_DEFAULT);
 281         default:
 282                 *valp = (cc_t)0;
 283                 *valpp = (cc_t *)0;
 284                 return(SLC_NOSUPPORT);
 285         }
 286 }
 287
 288 #else   /* USE_TERMIO */
 289
 290
 291 #define setval(a, b)    *valp = termbuf.c_cc[a]; \
 292                         *valpp = &termbuf.c_cc[a]; \
 293                         return(b);
 294 #define defval(a) *valp = ((cc_t)a); *valpp = (cc_t *)0; return(SLC_DEFAULT);
 295
 296 int
 297 spcset(int func, cc_t *valp, cc_t **valpp)
 298 {
 299         switch(func) {
 300         case SLC_EOF:
 301                 setval(VEOF, SLC_VARIABLE);
 302         case SLC_EC:
 303                 setval(VERASE, SLC_VARIABLE);
 304         case SLC_EL:
 305                 setval(VKILL, SLC_VARIABLE);
 306         case SLC_IP:
 307                 setval(VINTR, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
 308         case SLC_ABORT:
 309                 setval(VQUIT, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
 310         case SLC_XON:
 311 #ifdef  VSTART
 312                 setval(VSTART, SLC_VARIABLE);
 313 #else
 314                 defval(0x13);
 315 #endif
 316         case SLC_XOFF:
 317 #ifdef  VSTOP
 318                 setval(VSTOP, SLC_VARIABLE);
 319 #else
 320                 defval(0x11);
 321 #endif
 322         case SLC_EW:
 323 #ifdef  VWERASE
 324                 setval(VWERASE, SLC_VARIABLE);
 325 #else
 326                 defval(0);
 327 #endif
 328         case SLC_RP:
 329 #ifdef  VREPRINT
 330                 setval(VREPRINT, SLC_VARIABLE);
 331 #else
 332                 defval(0);
 333 #endif
 334         case SLC_LNEXT:
 335 #ifdef  VLNEXT
 336                 setval(VLNEXT, SLC_VARIABLE);
 337 #else
 338                 defval(0);
 339 #endif
 340         case SLC_AO:
 341 #if     !defined(VDISCARD) && defined(VFLUSHO)
 342 # define VDISCARD VFLUSHO
 343 #endif
 344 #ifdef  VDISCARD
 345                 setval(VDISCARD, SLC_VARIABLE|SLC_FLUSHOUT);
 346 #else
 347                 defval(0);
 348 #endif
 349         case SLC_SUSP:
 350 #ifdef  VSUSP
 351                 setval(VSUSP, SLC_VARIABLE|SLC_FLUSHIN);
 352 #else
 353                 defval(0);
 354 #endif
 355 #ifdef  VEOL
 356         case SLC_FORW1:
 357                 setval(VEOL, SLC_VARIABLE);
 358 #endif
 359 #ifdef  VEOL2
 360         case SLC_FORW2:
 361                 setval(VEOL2, SLC_VARIABLE);
 362 #endif
 363         case SLC_AYT:
 364 #ifdef  VSTATUS
 365                 setval(VSTATUS, SLC_VARIABLE);
 366 #else
 367                 defval(0);
 368 #endif
 369
 370         case SLC_BRK:
 371         case SLC_SYNCH:
 372         case SLC_EOR:
 373                 defval(0);
 374
 375         default:
 376                 *valp = 0;
 377                 *valpp = 0;
 378                 return(SLC_NOSUPPORT);
 379         }
 380 }
 381 #endif  /* USE_TERMIO */
 382
 383 /*
 384  * getpty()
 385  *
 386  * Allocate a pty.  As a side effect, the external character
 387  * array "line" contains the name of the slave side.
 388  *
 389  * Returns the file descriptor of the opened pty.
 390  */
 391 char alpha[] = "0123456789abcdefghijklmnopqrstuv";
 392 char line[16];
 393
 394 int
 395 getpty(int *ptynum __unused)
 396 {
 397         int p;
 398         const char *cp;
 399         char *p1, *p2;
 400         int i;
 401
 402         (void) strcpy(line, _PATH_DEV);
 403         (void) strcat(line, "ptyXX");
 404         p1 = &line[8];
 405         p2 = &line[9];
 406
 407         for (cp = "pqrsPQRS"; *cp; cp++) {
 408                 struct stat stb;
 409
 410                 *p1 = *cp;
 411                 *p2 = '0';
 412                 /*
 413                  * This stat() check is just to keep us from
 414                  * looping through all 256 combinations if there
 415                  * aren't that many ptys available.
 416                  */
 417                 if (stat(line, &stb) < 0)
 418                         break;
 419                 for (i = 0; i < 32; i++) {
 420                         *p2 = alpha[i];
 421                         p = open(line, 2);
 422                         if (p > 0) {
 423                                 line[5] = 't';
 424                                 chown(line, 0, 0);
 425                                 chmod(line, 0600);
 426                                         return(p);
 427                         }
 428                 }
 429         }
 430         return(-1);
 431 }
 432
 433 #ifdef  LINEMODE
 434 /*
 435  * tty_flowmode()       Find out if flow control is enabled or disabled.
 436  * tty_linemode()       Find out if linemode (external processing) is enabled.
 437  * tty_setlinemod(on)   Turn on/off linemode.
 438  * tty_isecho()         Find out if echoing is turned on.
 439  * tty_setecho(on)      Enable/disable character echoing.
 440  * tty_israw()          Find out if terminal is in RAW mode.
 441  * tty_binaryin(on)     Turn on/off BINARY on input.
 442  * tty_binaryout(on)    Turn on/off BINARY on output.
 443  * tty_isediting()      Find out if line editing is enabled.
 444  * tty_istrapsig()      Find out if signal trapping is enabled.
 445  * tty_setedit(on)      Turn on/off line editing.
 446  * tty_setsig(on)       Turn on/off signal trapping.
 447  * tty_issofttab()      Find out if tab expansion is enabled.
 448  * tty_setsofttab(on)   Turn on/off soft tab expansion.
 449  * tty_islitecho()      Find out if typed control chars are echoed literally
 450  * tty_setlitecho()     Turn on/off literal echo of control chars
 451  * tty_tspeed(val)      Set transmit speed to val.
 452  * tty_rspeed(val)      Set receive speed to val.
 453  */
 454
 455
 456 int
 457 tty_linemode(void)
 458 {
 459 #ifndef USE_TERMIO
 460         return(termbuf.state & TS_EXTPROC);
 461 #else
 462         return(termbuf.c_lflag & EXTPROC);
 463 #endif
 464 }
 465
 466 void
 467 tty_setlinemode(int on)
 468 {
 469 #ifdef  TIOCEXT
 470         set_termbuf();
 471         (void) ioctl(pty, TIOCEXT, (char *)&on);
 472         init_termbuf();
 473 #else   /* !TIOCEXT */
 474 # ifdef EXTPROC
 475         if (on)
 476                 termbuf.c_lflag |= EXTPROC;
 477         else
 478                 termbuf.c_lflag &= ~EXTPROC;
 479 # endif
 480 #endif  /* TIOCEXT */
 481 }
 482 #endif  /* LINEMODE */
 483
 484 int
 485 tty_isecho(void)
 486 {
 487 #ifndef USE_TERMIO
 488         return (termbuf.sg.sg_flags & ECHO);
 489 #else
 490         return (termbuf.c_lflag & ECHO);
 491 #endif
 492 }
 493
 494 int
 495 tty_flowmode(void)
 496 {
 497 #ifndef USE_TERMIO
 498         return(((termbuf.tc.t_startc) > 0 && (termbuf.tc.t_stopc) > 0) ? 1 : 0);
 499 #else
 500         return((termbuf.c_iflag & IXON) ? 1 : 0);
 501 #endif
 502 }
 503
 504 int
 505 tty_restartany(void)
 506 {
 507 #ifndef USE_TERMIO
 508 # ifdef DECCTQ
 509         return((termbuf.lflags & DECCTQ) ? 0 : 1);
 510 # else
 511         return(-1);
 512 # endif
 513 #else
 514         return((termbuf.c_iflag & IXANY) ? 1 : 0);
 515 #endif
 516 }
 517
 518 void
 519 tty_setecho(int on)
 520 {
 521 #ifndef USE_TERMIO
 522         if (on)
 523                 termbuf.sg.sg_flags |= ECHO|CRMOD;
 524         else
 525                 termbuf.sg.sg_flags &= ~(ECHO|CRMOD);
 526 #else
 527         if (on)
 528                 termbuf.c_lflag |= ECHO;
 529         else
 530                 termbuf.c_lflag &= ~ECHO;
 531 #endif
 532 }
 533
 534 int
 535 tty_israw(void)
 536 {
 537 #ifndef USE_TERMIO
 538         return(termbuf.sg.sg_flags & RAW);
 539 #else
 540         return(!(termbuf.c_lflag & ICANON));
 541 #endif
 542 }
 543
 544 #ifdef  AUTHENTICATION
 545 #if     defined(NO_LOGIN_F) && defined(LOGIN_R)
 546 int
 547 tty_setraw(int on)
 548 {
 549 #  ifndef USE_TERMIO
 550         if (on)
 551                 termbuf.sg.sg_flags |= RAW;
 552         else
 553                 termbuf.sg.sg_flags &= ~RAW;
 554 #  else
 555         if (on)
 556                 termbuf.c_lflag &= ~ICANON;
 557         else
 558                 termbuf.c_lflag |= ICANON;
 559 #  endif
 560 }
 561 #endif
 562 #endif /* AUTHENTICATION */
 563
 564 void
 565 tty_binaryin(int on)
 566 {
 567 #ifndef USE_TERMIO
 568         if (on)
 569                 termbuf.lflags |= LPASS8;
 570         else
 571                 termbuf.lflags &= ~LPASS8;
 572 #else
 573         if (on) {
 574                 termbuf.c_iflag &= ~ISTRIP;
 575         } else {
 576                 termbuf.c_iflag |= ISTRIP;
 577         }
 578 #endif
 579 }
 580
 581 void
 582 tty_binaryout(int on)
 583 {
 584 #ifndef USE_TERMIO
 585         if (on)
 586                 termbuf.lflags |= LLITOUT;
 587         else
 588                 termbuf.lflags &= ~LLITOUT;
 589 #else
 590         if (on) {
 591                 termbuf.c_cflag &= ~(CSIZE|PARENB);
 592                 termbuf.c_cflag |= CS8;
 593                 termbuf.c_oflag &= ~OPOST;
 594         } else {
 595                 termbuf.c_cflag &= ~CSIZE;
 596                 termbuf.c_cflag |= CS7|PARENB;
 597                 termbuf.c_oflag |= OPOST;
 598         }
 599 #endif
 600 }
 601
 602 int
 603 tty_isbinaryin(void)
 604 {
 605 #ifndef USE_TERMIO
 606         return(termbuf.lflags & LPASS8);
 607 #else
 608         return(!(termbuf.c_iflag & ISTRIP));
 609 #endif
 610 }
 611
 612 int
 613 tty_isbinaryout(void)
 614 {
 615 #ifndef USE_TERMIO
 616         return(termbuf.lflags & LLITOUT);
 617 #else
 618         return(!(termbuf.c_oflag&OPOST));
 619 #endif
 620 }
 621
 622 #ifdef  LINEMODE
 623 int
 624 tty_isediting(void)
 625 {
 626 #ifndef USE_TERMIO
 627         return(!(termbuf.sg.sg_flags & (CBREAK|RAW)));
 628 #else
 629         return(termbuf.c_lflag & ICANON);
 630 #endif
 631 }
 632
 633 int
 634 tty_istrapsig(void)
 635 {
 636 #ifndef USE_TERMIO
 637         return(!(termbuf.sg.sg_flags&RAW));
 638 #else
 639         return(termbuf.c_lflag & ISIG);
 640 #endif
 641 }
 642
 643 void
 644 tty_setedit(int on)
 645 {
 646 #ifndef USE_TERMIO
 647         if (on)
 648                 termbuf.sg.sg_flags &= ~CBREAK;
 649         else
 650                 termbuf.sg.sg_flags |= CBREAK;
 651 #else
 652         if (on)
 653                 termbuf.c_lflag |= ICANON;
 654         else
 655                 termbuf.c_lflag &= ~ICANON;
 656 #endif
 657 }
 658
 659 void
 660 tty_setsig(int on)
 661 {
 662 #ifndef USE_TERMIO
 663         if (on)
 664                 ;
 665 #else
 666         if (on)
 667                 termbuf.c_lflag |= ISIG;
 668         else
 669                 termbuf.c_lflag &= ~ISIG;
 670 #endif
 671 }
 672 #endif  /* LINEMODE */
 673
 674 int
 675 tty_issofttab(void)
 676 {
 677 #ifndef USE_TERMIO
 678         return (termbuf.sg.sg_flags & XTABS);
 679 #else
 680 # ifdef OXTABS
 681         return (termbuf.c_oflag & OXTABS);
 682 # endif
 683 # ifdef TABDLY
 684         return ((termbuf.c_oflag & TABDLY) == TAB3);
 685 # endif
 686 #endif
 687 }
 688
 689 void
 690 tty_setsofttab(int on)
 691 {
 692 #ifndef USE_TERMIO
 693         if (on)
 694                 termbuf.sg.sg_flags |= XTABS;
 695         else
 696                 termbuf.sg.sg_flags &= ~XTABS;
 697 #else
 698         if (on) {
 699 # ifdef OXTABS
 700                 termbuf.c_oflag |= OXTABS;
 701 # endif
 702 # ifdef TABDLY
 703                 termbuf.c_oflag &= ~TABDLY;
 704                 termbuf.c_oflag |= TAB3;
 705 # endif
 706         } else {
 707 # ifdef OXTABS
 708                 termbuf.c_oflag &= ~OXTABS;
 709 # endif
 710 # ifdef TABDLY
 711                 termbuf.c_oflag &= ~TABDLY;
 712                 termbuf.c_oflag |= TAB0;
 713 # endif
 714         }
 715 #endif
 716 }
 717
 718 int
 719 tty_islitecho(void)
 720 {
 721 #ifndef USE_TERMIO
 722         return (!(termbuf.lflags & LCTLECH));
 723 #else
 724 # ifdef ECHOCTL
 725         return (!(termbuf.c_lflag & ECHOCTL));
 726 # endif
 727 # ifdef TCTLECH
 728         return (!(termbuf.c_lflag & TCTLECH));
 729 # endif
 730 # if    !defined(ECHOCTL) && !defined(TCTLECH)
 731         return (0);     /* assumes ctl chars are echoed '^x' */
 732 # endif
 733 #endif
 734 }
 735
 736 void
 737 tty_setlitecho(int on)
 738 {
 739 #ifndef USE_TERMIO
 740         if (on)
 741                 termbuf.lflags &= ~LCTLECH;
 742         else
 743                 termbuf.lflags |= LCTLECH;
 744 #else
 745 # ifdef ECHOCTL
 746         if (on)
 747                 termbuf.c_lflag &= ~ECHOCTL;
 748         else
 749                 termbuf.c_lflag |= ECHOCTL;
 750 # endif
 751 # ifdef TCTLECH
 752         if (on)
 753                 termbuf.c_lflag &= ~TCTLECH;
 754         else
 755                 termbuf.c_lflag |= TCTLECH;
 756 # endif
 757 #endif
 758 }
 759
 760 int
 761 tty_iscrnl(void)
 762 {
 763 #ifndef USE_TERMIO
 764         return (termbuf.sg.sg_flags & CRMOD);
 765 #else
 766         return (termbuf.c_iflag & ICRNL);
 767 #endif
 768 }
 769
 770 /*
 771  * Try to guess whether speeds are "encoded" (4.2BSD) or just numeric (4.4BSD).
 772  */
 773 #if B4800 != 4800
 774 #define DECODE_BAUD
 775 #endif
 776
 777 #ifdef  DECODE_BAUD
 778
 779 /*
 780  * A table of available terminal speeds
 781  */
 782 struct termspeeds {
 783         int     speed;
 784         int     value;
 785 } termspeeds[] = {
 786         { 0,      B0 },      { 50,    B50 },    { 75,     B75 },
 787         { 110,    B110 },    { 134,   B134 },   { 150,    B150 },
 788         { 200,    B200 },    { 300,   B300 },   { 600,    B600 },
 789         { 1200,   B1200 },   { 1800,  B1800 },  { 2400,   B2400 },
 790         { 4800,   B4800 },
 791 #ifdef  B7200
 792         { 7200,  B7200 },
 793 #endif
 794         { 9600,   B9600 },
 795 #ifdef  B14400
 796         { 14400,  B14400 },
 797 #endif
 798 #ifdef  B19200
 799         { 19200,  B19200 },
 800 #endif
 801 #ifdef  B28800
 802         { 28800,  B28800 },
 803 #endif
 804 #ifdef  B38400
 805         { 38400,  B38400 },
 806 #endif
 807 #ifdef  B57600
 808         { 57600,  B57600 },
 809 #endif
 810 #ifdef  B115200
 811         { 115200, B115200 },
 812 #endif
 813 #ifdef  B230400
 814         { 230400, B230400 },
 815 #endif
 816         { -1,     0 }
 817 };
 818 #endif  /* DECODE_BAUD */
 819
 820 void
 821 tty_tspeed(int val)
 822 {
 823 #ifdef  DECODE_BAUD
 824         struct termspeeds *tp;
 825
 826         for (tp = termspeeds; (tp->speed != -1) && (val > tp->speed); tp++)
 827                 ;
 828         if (tp->speed == -1)    /* back up to last valid value */
 829                 --tp;
 830         cfsetospeed(&termbuf, tp->value);
 831 #else   /* DECODE_BAUD */
 832         cfsetospeed(&termbuf, val);
 833 #endif  /* DECODE_BAUD */
 834 }
 835
 836 void
 837 tty_rspeed(int val)
 838 {
 839 #ifdef  DECODE_BAUD
 840         struct termspeeds *tp;
 841
 842         for (tp = termspeeds; (tp->speed != -1) && (val > tp->speed); tp++)
 843                 ;
 844         if (tp->speed == -1)    /* back up to last valid value */
 845                 --tp;
 846         cfsetispeed(&termbuf, tp->value);
 847 #else   /* DECODE_BAUD */
 848         cfsetispeed(&termbuf, val);
 849 #endif  /* DECODE_BAUD */
 850 }
 851
 852 /*
 853  * getptyslave()
 854  *
 855  * Open the slave side of the pty, and do any initialization
 856  * that is necessary.
 857  */
 858 static void
 859 getptyslave(void)
 860 {
 861         int t = -1;
 862         char erase;
 863
 864 # ifdef LINEMODE
 865         int waslm;
 866 # endif
 867 # ifdef TIOCGWINSZ
 868         struct winsize ws;
 869         extern int def_row, def_col;
 870 # endif
 871         extern int def_tspeed, def_rspeed;
 872         /*
 873          * Opening the slave side may cause initilization of the
 874          * kernel tty structure.  We need remember the state of
 875          *      if linemode was turned on
 876          *      terminal window size
 877          *      terminal speed
 878          *      erase character
 879          * so that we can re-set them if we need to.
 880          */
 881 # ifdef LINEMODE
 882         waslm = tty_linemode();
 883 # endif
 884         erase = termbuf.c_cc[VERASE];
 885
 886         /*
 887          * Make sure that we don't have a controlling tty, and
 888          * that we are the session (process group) leader.
 889          */
 890 # ifdef TIOCNOTTY
 891         t = open(_PATH_TTY, O_RDWR);
 892         if (t >= 0) {
 893                 (void) ioctl(t, TIOCNOTTY, (char *)0);
 894                 (void) close(t);
 895         }
 896 # endif
 897
 898         t = cleanopen(line);
 899         if (t < 0)
 900                 fatalperror(net, line);
 901
 902
 903         /*
 904          * set up the tty modes as we like them to be.
 905          */
 906         init_termbuf();
 907 # ifdef TIOCGWINSZ
 908         if (def_row || def_col) {
 909                 memset((char *)&ws, 0, sizeof(ws));
 910                 ws.ws_col = def_col;
 911                 ws.ws_row = def_row;
 912                 (void)ioctl(t, TIOCSWINSZ, (char *)&ws);
 913         }
 914 # endif
 915
 916         /*
 917          * Settings for sgtty based systems
 918          */
 919 # ifndef        USE_TERMIO
 920         termbuf.sg.sg_flags |= CRMOD|ANYP|ECHO|XTABS;
 921 # endif /* USE_TERMIO */
 922
 923         /*
 924          * Settings for all other termios/termio based
 925          * systems, other than 4.4BSD.  In 4.4BSD the
 926          * kernel does the initial terminal setup.
 927          */
 928         tty_rspeed((def_rspeed > 0) ? def_rspeed : 9600);
 929         tty_tspeed((def_tspeed > 0) ? def_tspeed : 9600);
 930         if (erase)
 931                 termbuf.c_cc[VERASE] = erase;
 932 # ifdef LINEMODE
 933         if (waslm)
 934                 tty_setlinemode(1);
 935 # endif /* LINEMODE */
 936
 937         /*
 938          * Set the tty modes, and make this our controlling tty.
 939          */
 940         set_termbuf();
 941         if (login_tty(t) == -1)
 942                 fatalperror(net, "login_tty");
 943         if (net > 2)
 944                 (void) close(net);
 945 #ifdef  AUTHENTICATION
 946 #if     defined(NO_LOGIN_F) && defined(LOGIN_R)
 947         /*
 948          * Leave the pty open so that we can write out the rlogin
 949          * protocol for /bin/login, if the authentication works.
 950          */
 951 #else
 952         if (pty > 2) {
 953                 (void) close(pty);
 954                 pty = -1;
 955         }
 956 #endif
 957 #endif /* AUTHENTICATION */
 958 }
 959
 960 #ifndef O_NOCTTY
 961 #define O_NOCTTY        0
 962 #endif
 963 /*
 964  * Open the specified slave side of the pty,
 965  * making sure that we have a clean tty.
 966  */
 967 int
 968 cleanopen(char *li)
 969 {
 970         int t;
 971
 972         /*
 973          * Make sure that other people can't open the
 974          * slave side of the connection.
 975          */
 976         (void) chown(li, 0, 0);
 977         (void) chmod(li, 0600);
 978
 979         (void) revoke(li);
 980
 981         t = open(line, O_RDWR|O_NOCTTY);
 982
 983         if (t < 0)
 984                 return(-1);
 985
 986         return(t);
 987 }
 988
 989 /*
 990  * startslave(host)
 991  *
 992  * Given a hostname, do whatever
 993  * is necessary to startup the login process on the slave side of the pty.
 994  */
 995
 996 /* ARGSUSED */
 997 void
 998 startslave(char *host, int autologin, char *autoname)
 999 {
1000         int i;
1001
1002 #ifdef  AUTHENTICATION
1003         if (!autoname || !autoname[0])
1004                 autologin = 0;
1005
1006         if (autologin < auth_level) {
1007                 fatal(net, "Authorization failed");
1008                 exit(1);
1009         }
1010 #endif
1011
1012
1013         if ((i = fork()) < 0)
1014                 fatalperror(net, "fork");
1015         if (i) {
1016         } else {
1017                 getptyslave();
1018                 start_login(host, autologin, autoname);
1019                 /*NOTREACHED*/
1020         }
1021 }
1022
1023 void
1024 init_env(void)
1025 {
1026         char **envp;
1027
1028         envp = envinit;
1029         if ((*envp = getenv("TZ")))
1030                 *envp++ -= 3;
1031         *envp = 0;
1032         environ = envinit;
1033 }
1034
1035
1036 /*
1037  * start_login(host)
1038  *
1039  * Assuming that we are now running as a child processes, this
1040  * function will turn us into the login process.
1041  */
1042
1043 #ifndef AUTHENTICATION
1044 #define undef1 __unused
1045 #else
1046 #define undef1
1047 #endif
1048
1049 void
1050 start_login(char *host undef1, int autologin undef1, char *name undef1)
1051 {
1052         char **argv;
1053
1054         scrub_env();
1055
1056         /*
1057          * -h : pass on name of host.
1058          *              WARNING:  -h is accepted by login if and only if
1059          *                      getuid() == 0.
1060          * -p : don't clobber the environment (so terminal type stays set).
1061          *
1062          * -f : force this login, he has already been authenticated
1063          */
1064         argv = addarg(0, "login");
1065
1066 #if     !defined(NO_LOGIN_H)
1067 #ifdef  AUTHENTICATION
1068 # if    defined(NO_LOGIN_F) && defined(LOGIN_R)
1069         /*
1070          * Don't add the "-h host" option if we are going
1071          * to be adding the "-r host" option down below...
1072          */
1073         if ((auth_level < 0) || (autologin != AUTH_VALID))
1074 # endif
1075         {
1076                 argv = addarg(argv, "-h");
1077                 argv = addarg(argv, host);
1078         }
1079 #endif /* AUTHENTICATION */
1080 #endif
1081 #if     !defined(NO_LOGIN_P)
1082         argv = addarg(argv, "-p");
1083 #endif
1084 #ifdef  LINEMODE
1085         /*
1086          * Set the environment variable "LINEMODE" to either
1087          * "real" or "kludge" if we are operating in either
1088          * real or kludge linemode.
1089          */
1090         if (lmodetype == REAL_LINEMODE)
1091                 setenv("LINEMODE", "real", 1);
1092 # ifdef KLUDGELINEMODE
1093         else if (lmodetype == KLUDGE_LINEMODE || lmodetype == KLUDGE_OK)
1094                 setenv("LINEMODE", "kludge", 1);
1095 # endif
1096 #endif
1097 #ifdef  BFTPDAEMON
1098         /*
1099          * Are we working as the bftp daemon?  If so, then ask login
1100          * to start bftp instead of shell.
1101          */
1102         if (bftpd) {
1103                 argv = addarg(argv, "-e");
1104                 argv = addarg(argv, BFTPPATH);
1105         } else
1106 #endif
1107 #ifdef  AUTHENTICATION
1108         if (auth_level >= 0 && autologin == AUTH_VALID) {
1109 # if    !defined(NO_LOGIN_F)
1110                 argv = addarg(argv, "-f");
1111                 argv = addarg(argv, "--");
1112                 argv = addarg(argv, name);
1113 # else
1114 #  if defined(LOGIN_R)
1115                 /*
1116                  * We don't have support for "login -f", but we
1117                  * can fool /bin/login into thinking that we are
1118                  * rlogind, and allow us to log in without a
1119                  * password.  The rlogin protocol expects
1120                  *      local-user\0remote-user\0term/speed\0
1121                  */
1122
1123                 if (pty > 2) {
1124                         char *cp;
1125                         char speed[128];
1126                         int isecho, israw, xpty, len;
1127                         extern int def_rspeed;
1128 #  ifndef LOGIN_HOST
1129                         /*
1130                          * Tell login that we are coming from "localhost".
1131                          * If we passed in the real host name, then the
1132                          * user would have to allow .rhost access from
1133                          * every machine that they want authenticated
1134                          * access to work from, which sort of defeats
1135                          * the purpose of an authenticated login...
1136                          * So, we tell login that the session is coming
1137                          * from "localhost", and the user will only have
1138                          * to have "localhost" in their .rhost file.
1139                          */
1140 #                       define LOGIN_HOST "localhost"
1141 #  endif
1142                         argv = addarg(argv, "-r");
1143                         argv = addarg(argv, LOGIN_HOST);
1144
1145                         xpty = pty;
1146                         pty = 0;
1147                         init_termbuf();
1148                         isecho = tty_isecho();
1149                         israw = tty_israw();
1150                         if (isecho || !israw) {
1151                                 tty_setecho(0);         /* Turn off echo */
1152                                 tty_setraw(1);          /* Turn on raw */
1153                                 set_termbuf();
1154                         }
1155                         len = strlen(name)+1;
1156                         write(xpty, name, len);
1157                         write(xpty, name, len);
1158                         snprintf(speed, sizeof(speed),
1159                                 "%s/%d", (cp = getenv("TERM")) ? cp : "",
1160                                 (def_rspeed > 0) ? def_rspeed : 9600);
1161                         len = strlen(speed)+1;
1162                         write(xpty, speed, len);
1163
1164                         if (isecho || !israw) {
1165                                 init_termbuf();
1166                                 tty_setecho(isecho);
1167                                 tty_setraw(israw);
1168                                 set_termbuf();
1169                                 if (!israw) {
1170                                         /*
1171                                          * Write a newline to ensure
1172                                          * that login will be able to
1173                                          * read the line...
1174                                          */
1175                                         write(xpty, "\n", 1);
1176                                 }
1177                         }
1178                         pty = xpty;
1179                 }
1180 #  else
1181                 argv = addarg(argv, "--");
1182                 argv = addarg(argv, name);
1183 #  endif
1184 # endif
1185         } else
1186 #endif
1187         if (getenv("USER")) {
1188                 argv = addarg(argv, "--");
1189                 argv = addarg(argv, getenv("USER"));
1190 #if     defined(LOGIN_ARGS) && defined(NO_LOGIN_P)
1191                 {
1192                         char **cpp;
1193                         for (cpp = environ; *cpp; cpp++)
1194                                 argv = addarg(argv, *cpp);
1195                 }
1196 #endif
1197                 /*
1198                  * Assume that login will set the USER variable
1199                  * correctly.  For SysV systems, this means that
1200                  * USER will no longer be set, just LOGNAME by
1201                  * login.  (The problem is that if the auto-login
1202                  * fails, and the user then specifies a different
1203                  * account name, he can get logged in with both
1204                  * LOGNAME and USER in his environment, but the
1205                  * USER value will be wrong.
1206                  */
1207                 unsetenv("USER");
1208         }
1209 #ifdef  AUTHENTICATION
1210 #if     defined(NO_LOGIN_F) && defined(LOGIN_R)
1211         if (pty > 2)
1212                 close(pty);
1213 #endif
1214 #endif /* AUTHENTICATION */
1215         closelog();
1216
1217         if (altlogin == NULL) {
1218                 altlogin = _PATH_LOGIN;
1219         }
1220         execv(altlogin, argv);
1221
1222         syslog(LOG_ERR, "%s: %m", altlogin);
1223         fatalperror(net, altlogin);
1224         /*NOTREACHED*/
1225 }
1226
1227 static char **
1228 addarg(char **argv, const char *val)
1229 {
1230         char **cpp;
1231
1232         if (argv == NULL) {
1233                 /*
1234                  * 10 entries, a leading length, and a null
1235                  */
1236                 argv = (char **)malloc(sizeof(*argv) * 12);
1237                 if (argv == NULL)
1238                         return(NULL);
1239                 *argv++ = (char *)10;
1240                 *argv = (char *)0;
1241         }
1242         for (cpp = argv; *cpp; cpp++)
1243                 ;
1244         if (cpp == &argv[(long)argv[-1]]) {
1245                 --argv;
1246                 *argv = (char *)((long)(*argv) + 10);
1247                 argv = (char **)realloc(argv, sizeof(*argv)*((long)(*argv) + 2));
1248                 if (argv == NULL)
1249                         return(NULL);
1250                 argv++;
1251                 cpp = &argv[(long)argv[-1] - 10];
1252         }
1253         *cpp++ = strdup(val);
1254         *cpp = 0;
1255         return(argv);
1256 }
1257
1258 /*
1259  * scrub_env()
1260  *
1261  * We only accept the environment variables listed below.
1262  */
1263 void
1264 scrub_env(void)
1265 {
1266         static const char *rej[] = {
1267                 "TERMCAP=/",
1268                 NULL
1269         };
1270
1271         static const char *acc[] = {
1272                 "XAUTH=", "XAUTHORITY=", "DISPLAY=",
1273                 "TERM=",
1274                 "EDITOR=",
1275                 "PAGER=",
1276                 "LOGNAME=",
1277                 "POSIXLY_CORRECT=",
1278                 "PRINTER=",
1279                 NULL
1280         };
1281
1282         char **cpp, **cpp2;
1283         const char **p;
1284         char ** new_environ;
1285         size_t count;
1286
1287         /* Allocate space for scrubbed environment. */
1288         for (count = 1, cpp = environ; *cpp; count++, cpp++)
1289                 continue;
1290         if ((new_environ = malloc(count * sizeof(char *))) == NULL) {
1291                 environ = NULL;
1292                 return;
1293         }
1294
1295         for (cpp2 = new_environ, cpp = environ; *cpp; cpp++) {
1296                 int reject_it = 0;
1297
1298                 for(p = rej; *p; p++)
1299                         if(strncmp(*cpp, *p, strlen(*p)) == 0) {
1300                                 reject_it = 1;
1301                                 break;
1302                         }
1303                 if (reject_it)
1304                         continue;
1305
1306                 for(p = acc; *p; p++)
1307                         if(strncmp(*cpp, *p, strlen(*p)) == 0)
1308                                 break;
1309                 if(*p != NULL) {
1310                         if ((*cpp2++ = strdup(*cpp)) == NULL) {
1311                                 environ = new_environ;
1312                                 return;
1313                         }
1314                 }
1315         }
1316         *cpp2 = NULL;
1317         environ = new_environ;
1318 }
1319
1320 /*
1321  * cleanup()
1322  *
1323  * This is the routine to call when we are all through, to
1324  * clean up anything that needs to be cleaned up.
1325  */
1326 /* ARGSUSED */
1327 void
1328 cleanup(int sig __unused)
1329 {
1330         char *p;
1331         sigset_t mask;
1332
1333         p = line + sizeof(_PATH_DEV) - 1;
1334         /*
1335          * Block all signals before clearing the utmp entry.  We don't want to
1336          * be called again after calling logout() and then not add the wtmp
1337          * entry because of not finding the corresponding entry in utmp.
1338          */
1339         sigfillset(&mask);
1340         sigprocmask(SIG_SETMASK, &mask, NULL);
1341         if (logout(p))
1342                 logwtmp(p, "", "");
1343         (void)chmod(line, 0666);
1344         (void)chown(line, 0, 0);
1345         *p = 'p';
1346         (void)chmod(line, 0666);
1347         (void)chown(line, 0, 0);
1348         (void) shutdown(net, 2);
1349         _exit(1);
1350 }