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: src/contrib/telnet/telnetd/sys_term.c,v 1.18 2003/05/04 02:54:49 obrien Exp $"); 41 42 #include <sys/types.h> 43 #include <libutil.h> 44 #include <stdlib.h> 45 #if (!defined(__BEOS__) && !defined(__HAIKU__)) 46 # include <sys/tty.h> 47 # include <utmp.h> 48 #endif 49 50 #include "telnetd.h" 51 #include "pathnames.h" 52 53 #ifdef AUTHENTICATION 54 #include <libtelnet/auth.h> 55 #endif 56 57 int cleanopen(char *); 58 void scrub_env(void); 59 60 #if (!defined(__BEOS__) && !defined(__HAIKU__)) 61 62 struct utmp wtmp; 63 64 # ifdef _PATH_WTMP 65 char wtmpf[] = _PATH_WTMP; 66 # else 67 char wtmpf[] = "/var/log/wtmp"; 68 # endif 69 # ifdef _PATH_UTMP 70 char utmpf[] = _PATH_UTMP; 71 # else 72 char utmpf[] = "/var/run/utmp"; 73 # endif 74 #endif 75 76 char *envinit[3]; 77 extern char **environ; 78 79 #define SCPYN(a, b) (void) strncpy(a, b, sizeof(a)) 80 #define SCMPN(a, b) strncmp(a, b, sizeof(a)) 81 82 #ifdef t_erase 83 #undef t_erase 84 #undef t_kill 85 #undef t_intrc 86 #undef t_quitc 87 #undef t_startc 88 #undef t_stopc 89 #undef t_eofc 90 #undef t_brkc 91 #undef t_suspc 92 #undef t_dsuspc 93 #undef t_rprntc 94 #undef t_flushc 95 #undef t_werasc 96 #undef t_lnextc 97 #endif 98 99 #ifndef USE_TERMIO 100 struct termbuf { 101 struct sgttyb sg; 102 struct tchars tc; 103 struct ltchars ltc; 104 int state; 105 int lflags; 106 } termbuf, termbuf2; 107 # define cfsetospeed(tp, val) (tp)->sg.sg_ospeed = (val) 108 # define cfsetispeed(tp, val) (tp)->sg.sg_ispeed = (val) 109 # define cfgetospeed(tp) (tp)->sg.sg_ospeed 110 # define cfgetispeed(tp) (tp)->sg.sg_ispeed 111 #else /* USE_TERMIO */ 112 # ifndef TCSANOW 113 # ifdef TCSETS 114 # define TCSANOW TCSETS 115 # define TCSADRAIN TCSETSW 116 # define tcgetattr(f, t) ioctl(f, TCGETS, (char *)t) 117 # else 118 # ifdef TCSETA 119 # define TCSANOW TCSETA 120 # define TCSADRAIN TCSETAW 121 # define tcgetattr(f, t) ioctl(f, TCGETA, (char *)t) 122 # else 123 # define TCSANOW TIOCSETA 124 # define TCSADRAIN TIOCSETAW 125 # define tcgetattr(f, t) ioctl(f, TIOCGETA, (char *)t) 126 # endif 127 # endif 128 # define tcsetattr(f, a, t) ioctl(f, a, t) 129 # define cfsetospeed(tp, val) (tp)->c_cflag &= ~CBAUD; \ 130 (tp)->c_cflag |= (val) 131 # define cfgetospeed(tp) ((tp)->c_cflag & CBAUD) 132 # ifdef CIBAUD 133 # define cfsetispeed(tp, val) (tp)->c_cflag &= ~CIBAUD; \ 134 (tp)->c_cflag |= ((val)<<IBSHIFT) 135 # define cfgetispeed(tp) (((tp)->c_cflag & CIBAUD)>>IBSHIFT) 136 # else 137 # define cfsetispeed(tp, val) (tp)->c_cflag &= ~CBAUD; \ 138 (tp)->c_cflag |= (val) 139 # define cfgetispeed(tp) ((tp)->c_cflag & CBAUD) 140 # endif 141 # endif /* TCSANOW */ 142 struct termios termbuf, termbuf2; /* pty control structure */ 143 #endif /* USE_TERMIO */ 144 145 #include <sys/types.h> 146 #include <libutil.h> 147 148 int cleanopen(char *); 149 void scrub_env(void); 150 static char **addarg(char **, const char *); 151 152 /* 153 * init_termbuf() 154 * copy_termbuf(cp) 155 * set_termbuf() 156 * 157 * These three routines are used to get and set the "termbuf" structure 158 * to and from the kernel. init_termbuf() gets the current settings. 159 * copy_termbuf() hands in a new "termbuf" to write to the kernel, and 160 * set_termbuf() writes the structure into the kernel. 161 */ 162 163 void 164 init_termbuf(void) 165 { 166 #ifndef USE_TERMIO 167 (void) ioctl(pty, TIOCGETP, (char *)&termbuf.sg); 168 (void) ioctl(pty, TIOCGETC, (char *)&termbuf.tc); 169 (void) ioctl(pty, TIOCGLTC, (char *)&termbuf.ltc); 170 # ifdef TIOCGSTATE 171 (void) ioctl(pty, TIOCGSTATE, (char *)&termbuf.state); 172 # endif 173 #else 174 (void) tcgetattr(pty, &termbuf); 175 #endif 176 termbuf2 = termbuf; 177 } 178 179 #if defined(LINEMODE) && defined(TIOCPKT_IOCTL) 180 void 181 copy_termbuf(char *cp, size_t len) 182 { 183 if (len > sizeof(termbuf)) 184 len = sizeof(termbuf); 185 memmove((char *)&termbuf, cp, len); 186 termbuf2 = termbuf; 187 } 188 #endif /* defined(LINEMODE) && defined(TIOCPKT_IOCTL) */ 189 190 void 191 set_termbuf(void) 192 { 193 /* 194 * Only make the necessary changes. 195 */ 196 #ifndef USE_TERMIO 197 if (memcmp((char *)&termbuf.sg, (char *)&termbuf2.sg, 198 sizeof(termbuf.sg))) 199 (void) ioctl(pty, TIOCSETN, (char *)&termbuf.sg); 200 if (memcmp((char *)&termbuf.tc, (char *)&termbuf2.tc, 201 sizeof(termbuf.tc))) 202 (void) ioctl(pty, TIOCSETC, (char *)&termbuf.tc); 203 if (memcmp((char *)&termbuf.ltc, (char *)&termbuf2.ltc, 204 sizeof(termbuf.ltc))) 205 (void) ioctl(pty, TIOCSLTC, (char *)&termbuf.ltc); 206 if (termbuf.lflags != termbuf2.lflags) 207 (void) ioctl(pty, TIOCLSET, (char *)&termbuf.lflags); 208 #else /* USE_TERMIO */ 209 if (memcmp((char *)&termbuf, (char *)&termbuf2, sizeof(termbuf))) 210 (void) tcsetattr(pty, TCSANOW, &termbuf); 211 #endif /* USE_TERMIO */ 212 } 213 214 215 /* 216 * spcset(func, valp, valpp) 217 * 218 * This function takes various special characters (func), and 219 * sets *valp to the current value of that character, and 220 * *valpp to point to where in the "termbuf" structure that 221 * value is kept. 222 * 223 * It returns the SLC_ level of support for this function. 224 */ 225 226 #ifndef USE_TERMIO 227 int 228 spcset(int func, cc_t *valp, cc_t **valpp) 229 { 230 switch(func) { 231 case SLC_EOF: 232 *valp = termbuf.tc.t_eofc; 233 *valpp = (cc_t *)&termbuf.tc.t_eofc; 234 return(SLC_VARIABLE); 235 case SLC_EC: 236 *valp = termbuf.sg.sg_erase; 237 *valpp = (cc_t *)&termbuf.sg.sg_erase; 238 return(SLC_VARIABLE); 239 case SLC_EL: 240 *valp = termbuf.sg.sg_kill; 241 *valpp = (cc_t *)&termbuf.sg.sg_kill; 242 return(SLC_VARIABLE); 243 case SLC_IP: 244 *valp = termbuf.tc.t_intrc; 245 *valpp = (cc_t *)&termbuf.tc.t_intrc; 246 return(SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT); 247 case SLC_ABORT: 248 *valp = termbuf.tc.t_quitc; 249 *valpp = (cc_t *)&termbuf.tc.t_quitc; 250 return(SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT); 251 case SLC_XON: 252 *valp = termbuf.tc.t_startc; 253 *valpp = (cc_t *)&termbuf.tc.t_startc; 254 return(SLC_VARIABLE); 255 case SLC_XOFF: 256 *valp = termbuf.tc.t_stopc; 257 *valpp = (cc_t *)&termbuf.tc.t_stopc; 258 return(SLC_VARIABLE); 259 case SLC_AO: 260 *valp = termbuf.ltc.t_flushc; 261 *valpp = (cc_t *)&termbuf.ltc.t_flushc; 262 return(SLC_VARIABLE); 263 case SLC_SUSP: 264 *valp = termbuf.ltc.t_suspc; 265 *valpp = (cc_t *)&termbuf.ltc.t_suspc; 266 return(SLC_VARIABLE); 267 case SLC_EW: 268 *valp = termbuf.ltc.t_werasc; 269 *valpp = (cc_t *)&termbuf.ltc.t_werasc; 270 return(SLC_VARIABLE); 271 case SLC_RP: 272 *valp = termbuf.ltc.t_rprntc; 273 *valpp = (cc_t *)&termbuf.ltc.t_rprntc; 274 return(SLC_VARIABLE); 275 case SLC_LNEXT: 276 *valp = termbuf.ltc.t_lnextc; 277 *valpp = (cc_t *)&termbuf.ltc.t_lnextc; 278 return(SLC_VARIABLE); 279 case SLC_FORW1: 280 *valp = termbuf.tc.t_brkc; 281 *valpp = (cc_t *)&termbuf.ltc.t_lnextc; 282 return(SLC_VARIABLE); 283 case SLC_BRK: 284 case SLC_SYNCH: 285 case SLC_AYT: 286 case SLC_EOR: 287 *valp = (cc_t)0; 288 *valpp = (cc_t *)0; 289 return(SLC_DEFAULT); 290 default: 291 *valp = (cc_t)0; 292 *valpp = (cc_t *)0; 293 return(SLC_NOSUPPORT); 294 } 295 } 296 297 #else /* USE_TERMIO */ 298 299 300 #define setval(a, b) *valp = termbuf.c_cc[a]; \ 301 *valpp = &termbuf.c_cc[a]; \ 302 return(b); 303 #define defval(a) *valp = ((cc_t)a); *valpp = (cc_t *)0; return(SLC_DEFAULT); 304 305 int 306 spcset(int func, cc_t *valp, cc_t **valpp) 307 { 308 switch(func) { 309 case SLC_EOF: 310 setval(VEOF, SLC_VARIABLE); 311 case SLC_EC: 312 setval(VERASE, SLC_VARIABLE); 313 case SLC_EL: 314 setval(VKILL, SLC_VARIABLE); 315 case SLC_IP: 316 setval(VINTR, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT); 317 case SLC_ABORT: 318 setval(VQUIT, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT); 319 case SLC_XON: 320 #ifdef VSTART 321 setval(VSTART, SLC_VARIABLE); 322 #else 323 defval(0x13); 324 #endif 325 case SLC_XOFF: 326 #ifdef VSTOP 327 setval(VSTOP, SLC_VARIABLE); 328 #else 329 defval(0x11); 330 #endif 331 case SLC_EW: 332 #ifdef VWERASE 333 setval(VWERASE, SLC_VARIABLE); 334 #else 335 defval(0); 336 #endif 337 case SLC_RP: 338 #ifdef VREPRINT 339 setval(VREPRINT, SLC_VARIABLE); 340 #else 341 defval(0); 342 #endif 343 case SLC_LNEXT: 344 #ifdef VLNEXT 345 setval(VLNEXT, SLC_VARIABLE); 346 #else 347 defval(0); 348 #endif 349 case SLC_AO: 350 #if !defined(VDISCARD) && defined(VFLUSHO) 351 # define VDISCARD VFLUSHO 352 #endif 353 #ifdef VDISCARD 354 setval(VDISCARD, SLC_VARIABLE|SLC_FLUSHOUT); 355 #else 356 defval(0); 357 #endif 358 case SLC_SUSP: 359 #ifdef VSUSP 360 setval(VSUSP, SLC_VARIABLE|SLC_FLUSHIN); 361 #else 362 defval(0); 363 #endif 364 #ifdef VEOL 365 case SLC_FORW1: 366 setval(VEOL, SLC_VARIABLE); 367 #endif 368 #ifdef VEOL2 369 case SLC_FORW2: 370 setval(VEOL2, SLC_VARIABLE); 371 #endif 372 case SLC_AYT: 373 #ifdef VSTATUS 374 setval(VSTATUS, SLC_VARIABLE); 375 #else 376 defval(0); 377 #endif 378 379 case SLC_BRK: 380 case SLC_SYNCH: 381 case SLC_EOR: 382 defval(0); 383 384 default: 385 *valp = 0; 386 *valpp = 0; 387 return(SLC_NOSUPPORT); 388 } 389 } 390 #endif /* USE_TERMIO */ 391 392 /* 393 * getpty() 394 * 395 * Allocate a pty. As a side effect, the external character 396 * array "line" contains the name of the slave side. 397 * 398 * Returns the file descriptor of the opened pty. 399 */ 400 char alpha[] = "0123456789abcdefghijklmnopqrstuv"; 401 402 int 403 getpty(int *ptynum __unused) 404 { 405 int p; 406 const char *cp; 407 char *p1, *p2; 408 int i; 409 410 #if (defined(__BEOS__) || defined(__HAIKU__)) 411 (void) strcpy(line, "/dev/pt/XX"); 412 #else 413 (void) strcpy(line, _PATH_DEV); 414 (void) strcat(line, "ptyXX"); 415 #endif 416 p1 = &line[8]; 417 p2 = &line[9]; 418 419 for (cp = "pqrsPQRS"; *cp; cp++) { 420 struct stat stb; 421 422 *p1 = *cp; 423 *p2 = '0'; 424 /* 425 * This stat() check is just to keep us from 426 * looping through all 256 combinations if there 427 * aren't that many ptys available. 428 */ 429 if (stat(line, &stb) < 0) 430 break; 431 for (i = 0; i < 32; i++) { 432 *p2 = alpha[i]; 433 p = open(line, 2); 434 if (p > 0) { 435 line[5] = 't'; 436 chown(line, 0, 0); 437 chmod(line, 0600); 438 return(p); 439 } 440 } 441 } 442 return(-1); 443 } 444 445 #ifdef LINEMODE 446 /* 447 * tty_flowmode() Find out if flow control is enabled or disabled. 448 * tty_linemode() Find out if linemode (external processing) is enabled. 449 * tty_setlinemod(on) Turn on/off linemode. 450 * tty_isecho() Find out if echoing is turned on. 451 * tty_setecho(on) Enable/disable character echoing. 452 * tty_israw() Find out if terminal is in RAW mode. 453 * tty_binaryin(on) Turn on/off BINARY on input. 454 * tty_binaryout(on) Turn on/off BINARY on output. 455 * tty_isediting() Find out if line editing is enabled. 456 * tty_istrapsig() Find out if signal trapping is enabled. 457 * tty_setedit(on) Turn on/off line editing. 458 * tty_setsig(on) Turn on/off signal trapping. 459 * tty_issofttab() Find out if tab expansion is enabled. 460 * tty_setsofttab(on) Turn on/off soft tab expansion. 461 * tty_islitecho() Find out if typed control chars are echoed literally 462 * tty_setlitecho() Turn on/off literal echo of control chars 463 * tty_tspeed(val) Set transmit speed to val. 464 * tty_rspeed(val) Set receive speed to val. 465 */ 466 467 468 int 469 tty_linemode(void) 470 { 471 #ifndef USE_TERMIO 472 return(termbuf.state & TS_EXTPROC); 473 #else 474 return(termbuf.c_lflag & EXTPROC); 475 #endif 476 } 477 478 void 479 tty_setlinemode(int on) 480 { 481 #ifdef TIOCEXT 482 set_termbuf(); 483 (void) ioctl(pty, TIOCEXT, (char *)&on); 484 init_termbuf(); 485 #else /* !TIOCEXT */ 486 # ifdef EXTPROC 487 if (on) 488 termbuf.c_lflag |= EXTPROC; 489 else 490 termbuf.c_lflag &= ~EXTPROC; 491 # endif 492 #endif /* TIOCEXT */ 493 } 494 #endif /* LINEMODE */ 495 496 int 497 tty_isecho(void) 498 { 499 #ifndef USE_TERMIO 500 return (termbuf.sg.sg_flags & ECHO); 501 #else 502 return (termbuf.c_lflag & ECHO); 503 #endif 504 } 505 506 int 507 tty_flowmode(void) 508 { 509 #ifndef USE_TERMIO 510 return(((termbuf.tc.t_startc) > 0 && (termbuf.tc.t_stopc) > 0) ? 1 : 0); 511 #else 512 return((termbuf.c_iflag & IXON) ? 1 : 0); 513 #endif 514 } 515 516 int 517 tty_restartany(void) 518 { 519 #ifndef USE_TERMIO 520 # ifdef DECCTQ 521 return((termbuf.lflags & DECCTQ) ? 0 : 1); 522 # else 523 return(-1); 524 # endif 525 #else 526 return((termbuf.c_iflag & IXANY) ? 1 : 0); 527 #endif 528 } 529 530 void 531 tty_setecho(int on) 532 { 533 #ifndef USE_TERMIO 534 if (on) 535 termbuf.sg.sg_flags |= ECHO|CRMOD; 536 else 537 termbuf.sg.sg_flags &= ~(ECHO|CRMOD); 538 #else 539 if (on) 540 termbuf.c_lflag |= ECHO; 541 else 542 termbuf.c_lflag &= ~ECHO; 543 #endif 544 } 545 546 int 547 tty_israw(void) 548 { 549 #ifndef USE_TERMIO 550 return(termbuf.sg.sg_flags & RAW); 551 #else 552 return(!(termbuf.c_lflag & ICANON)); 553 #endif 554 } 555 556 #ifdef AUTHENTICATION 557 #if defined(NO_LOGIN_F) && defined(LOGIN_R) 558 int 559 tty_setraw(int on) 560 { 561 # ifndef USE_TERMIO 562 if (on) 563 termbuf.sg.sg_flags |= RAW; 564 else 565 termbuf.sg.sg_flags &= ~RAW; 566 # else 567 if (on) 568 termbuf.c_lflag &= ~ICANON; 569 else 570 termbuf.c_lflag |= ICANON; 571 # endif 572 } 573 #endif 574 #endif /* AUTHENTICATION */ 575 576 void 577 tty_binaryin(int on) 578 { 579 #ifndef USE_TERMIO 580 if (on) 581 termbuf.lflags |= LPASS8; 582 else 583 termbuf.lflags &= ~LPASS8; 584 #else 585 if (on) { 586 termbuf.c_iflag &= ~ISTRIP; 587 } else { 588 termbuf.c_iflag |= ISTRIP; 589 } 590 #endif 591 } 592 593 void 594 tty_binaryout(int on) 595 { 596 #ifndef USE_TERMIO 597 if (on) 598 termbuf.lflags |= LLITOUT; 599 else 600 termbuf.lflags &= ~LLITOUT; 601 #else 602 if (on) { 603 termbuf.c_cflag &= ~(CSIZE|PARENB); 604 termbuf.c_cflag |= CS8; 605 termbuf.c_oflag &= ~OPOST; 606 } else { 607 termbuf.c_cflag &= ~CSIZE; 608 termbuf.c_cflag |= CS7|PARENB; 609 termbuf.c_oflag |= OPOST; 610 } 611 #endif 612 } 613 614 int 615 tty_isbinaryin(void) 616 { 617 #ifndef USE_TERMIO 618 return(termbuf.lflags & LPASS8); 619 #else 620 return(!(termbuf.c_iflag & ISTRIP)); 621 #endif 622 } 623 624 int 625 tty_isbinaryout(void) 626 { 627 #ifndef USE_TERMIO 628 return(termbuf.lflags & LLITOUT); 629 #else 630 return(!(termbuf.c_oflag&OPOST)); 631 #endif 632 } 633 634 #ifdef LINEMODE 635 int 636 tty_isediting(void) 637 { 638 #ifndef USE_TERMIO 639 return(!(termbuf.sg.sg_flags & (CBREAK|RAW))); 640 #else 641 return(termbuf.c_lflag & ICANON); 642 #endif 643 } 644 645 int 646 tty_istrapsig(void) 647 { 648 #ifndef USE_TERMIO 649 return(!(termbuf.sg.sg_flags&RAW)); 650 #else 651 return(termbuf.c_lflag & ISIG); 652 #endif 653 } 654 655 void 656 tty_setedit(int on) 657 { 658 #ifndef USE_TERMIO 659 if (on) 660 termbuf.sg.sg_flags &= ~CBREAK; 661 else 662 termbuf.sg.sg_flags |= CBREAK; 663 #else 664 if (on) 665 termbuf.c_lflag |= ICANON; 666 else 667 termbuf.c_lflag &= ~ICANON; 668 #endif 669 } 670 671 void 672 tty_setsig(int on) 673 { 674 #ifndef USE_TERMIO 675 if (on) 676 ; 677 #else 678 if (on) 679 termbuf.c_lflag |= ISIG; 680 else 681 termbuf.c_lflag &= ~ISIG; 682 #endif 683 } 684 #endif /* LINEMODE */ 685 686 int 687 tty_issofttab(void) 688 { 689 #ifndef USE_TERMIO 690 return (termbuf.sg.sg_flags & XTABS); 691 #else 692 # ifdef OXTABS 693 return (termbuf.c_oflag & OXTABS); 694 # endif 695 # ifdef TABDLY 696 return ((termbuf.c_oflag & TABDLY) == TAB3); 697 # endif 698 #endif 699 } 700 701 void 702 tty_setsofttab(int on) 703 { 704 #ifndef USE_TERMIO 705 if (on) 706 termbuf.sg.sg_flags |= XTABS; 707 else 708 termbuf.sg.sg_flags &= ~XTABS; 709 #else 710 if (on) { 711 # ifdef OXTABS 712 termbuf.c_oflag |= OXTABS; 713 # endif 714 # ifdef TABDLY 715 termbuf.c_oflag &= ~TABDLY; 716 termbuf.c_oflag |= TAB3; 717 # endif 718 } else { 719 # ifdef OXTABS 720 termbuf.c_oflag &= ~OXTABS; 721 # endif 722 # ifdef TABDLY 723 termbuf.c_oflag &= ~TABDLY; 724 termbuf.c_oflag |= TAB0; 725 # endif 726 } 727 #endif 728 } 729 730 int 731 tty_islitecho(void) 732 { 733 #ifndef USE_TERMIO 734 return (!(termbuf.lflags & LCTLECH)); 735 #else 736 # ifdef ECHOCTL 737 return (!(termbuf.c_lflag & ECHOCTL)); 738 # endif 739 # ifdef TCTLECH 740 return (!(termbuf.c_lflag & TCTLECH)); 741 # endif 742 # if !defined(ECHOCTL) && !defined(TCTLECH) 743 return (0); /* assumes ctl chars are echoed '^x' */ 744 # endif 745 #endif 746 } 747 748 void 749 tty_setlitecho(int on) 750 { 751 #ifndef USE_TERMIO 752 if (on) 753 termbuf.lflags &= ~LCTLECH; 754 else 755 termbuf.lflags |= LCTLECH; 756 #else 757 # ifdef ECHOCTL 758 if (on) 759 termbuf.c_lflag &= ~ECHOCTL; 760 else 761 termbuf.c_lflag |= ECHOCTL; 762 # endif 763 # ifdef TCTLECH 764 if (on) 765 termbuf.c_lflag &= ~TCTLECH; 766 else 767 termbuf.c_lflag |= TCTLECH; 768 # endif 769 #endif 770 } 771 772 int 773 tty_iscrnl(void) 774 { 775 #ifndef USE_TERMIO 776 return (termbuf.sg.sg_flags & CRMOD); 777 #else 778 return (termbuf.c_iflag & ICRNL); 779 #endif 780 } 781 782 /* 783 * Try to guess whether speeds are "encoded" (4.2BSD) or just numeric (4.4BSD). 784 */ 785 #if B4800 != 4800 786 #define DECODE_BAUD 787 #endif 788 789 #ifdef DECODE_BAUD 790 791 /* 792 * A table of available terminal speeds 793 */ 794 struct termspeeds { 795 int speed; 796 int value; 797 } termspeeds[] = { 798 { 0, B0 }, { 50, B50 }, { 75, B75 }, 799 { 110, B110 }, { 134, B134 }, { 150, B150 }, 800 { 200, B200 }, { 300, B300 }, { 600, B600 }, 801 { 1200, B1200 }, { 1800, B1800 }, { 2400, B2400 }, 802 { 4800, B4800 }, 803 #ifdef B7200 804 { 7200, B7200 }, 805 #endif 806 { 9600, B9600 }, 807 #ifdef B14400 808 { 14400, B14400 }, 809 #endif 810 #ifdef B19200 811 { 19200, B19200 }, 812 #endif 813 #ifdef B28800 814 { 28800, B28800 }, 815 #endif 816 #ifdef B38400 817 { 38400, B38400 }, 818 #endif 819 #ifdef B57600 820 { 57600, B57600 }, 821 #endif 822 #ifdef B115200 823 { 115200, B115200 }, 824 #endif 825 #ifdef B230400 826 { 230400, B230400 }, 827 #endif 828 { -1, 0 } 829 }; 830 #endif /* DECODE_BAUD */ 831 832 void 833 tty_tspeed(int val) 834 { 835 #ifdef DECODE_BAUD 836 struct termspeeds *tp; 837 838 for (tp = termspeeds; (tp->speed != -1) && (val > tp->speed); tp++) 839 ; 840 if (tp->speed == -1) /* back up to last valid value */ 841 --tp; 842 cfsetospeed(&termbuf, tp->value); 843 #else /* DECODE_BAUD */ 844 cfsetospeed(&termbuf, val); 845 #endif /* DECODE_BAUD */ 846 } 847 848 void 849 tty_rspeed(int val) 850 { 851 #ifdef DECODE_BAUD 852 struct termspeeds *tp; 853 854 for (tp = termspeeds; (tp->speed != -1) && (val > tp->speed); tp++) 855 ; 856 if (tp->speed == -1) /* back up to last valid value */ 857 --tp; 858 cfsetispeed(&termbuf, tp->value); 859 #else /* DECODE_BAUD */ 860 cfsetispeed(&termbuf, val); 861 #endif /* DECODE_BAUD */ 862 } 863 864 /* 865 * getptyslave() 866 * 867 * Open the slave side of the pty, and do any initialization 868 * that is necessary. 869 */ 870 static void 871 getptyslave(void) 872 { 873 int t = -1; 874 char erase; 875 876 # ifdef LINEMODE 877 int waslm; 878 # endif 879 # ifdef TIOCGWINSZ 880 struct winsize ws; 881 extern int def_row, def_col; 882 # endif 883 extern int def_tspeed, def_rspeed; 884 /* 885 * Opening the slave side may cause initilization of the 886 * kernel tty structure. We need remember the state of 887 * if linemode was turned on 888 * terminal window size 889 * terminal speed 890 * erase character 891 * so that we can re-set them if we need to. 892 */ 893 # ifdef LINEMODE 894 waslm = tty_linemode(); 895 # endif 896 erase = termbuf.c_cc[VERASE]; 897 898 /* 899 * Make sure that we don't have a controlling tty, and 900 * that we are the session (process group) leader. 901 */ 902 # ifdef TIOCNOTTY 903 t = open(_PATH_TTY, O_RDWR); 904 if (t >= 0) { 905 (void) ioctl(t, TIOCNOTTY, (char *)0); 906 (void) close(t); 907 } 908 # endif 909 910 t = cleanopen(line); 911 if (t < 0) 912 fatalperror(net, line); 913 914 915 /* 916 * set up the tty modes as we like them to be. 917 */ 918 init_termbuf(); 919 # ifdef TIOCGWINSZ 920 if (def_row || def_col) { 921 memset((char *)&ws, 0, sizeof(ws)); 922 ws.ws_col = def_col; 923 ws.ws_row = def_row; 924 (void)ioctl(t, TIOCSWINSZ, (char *)&ws); 925 } 926 # endif 927 928 /* 929 * Settings for sgtty based systems 930 */ 931 # ifndef USE_TERMIO 932 termbuf.sg.sg_flags |= CRMOD|ANYP|ECHO|XTABS; 933 # endif /* USE_TERMIO */ 934 935 /* 936 * Settings for all other termios/termio based 937 * systems, other than 4.4BSD. In 4.4BSD the 938 * kernel does the initial terminal setup. 939 */ 940 tty_rspeed((def_rspeed > 0) ? def_rspeed : 9600); 941 tty_tspeed((def_tspeed > 0) ? def_tspeed : 9600); 942 if (erase) 943 termbuf.c_cc[VERASE] = erase; 944 # ifdef LINEMODE 945 if (waslm) 946 tty_setlinemode(1); 947 # endif /* LINEMODE */ 948 949 /* 950 * Set the tty modes, and make this our controlling tty. 951 */ 952 set_termbuf(); 953 if (login_tty(t) == -1) 954 fatalperror(net, "login_tty"); 955 if (net > 2) 956 (void) close(net); 957 #ifdef AUTHENTICATION 958 #if defined(NO_LOGIN_F) && defined(LOGIN_R) 959 /* 960 * Leave the pty open so that we can write out the rlogin 961 * protocol for /bin/login, if the authentication works. 962 */ 963 #else 964 if (pty > 2) { 965 (void) close(pty); 966 pty = -1; 967 } 968 #endif 969 #endif /* AUTHENTICATION */ 970 } 971 972 #ifndef O_NOCTTY 973 #define O_NOCTTY 0 974 #endif 975 /* 976 * Open the specified slave side of the pty, 977 * making sure that we have a clean tty. 978 */ 979 int 980 cleanopen(char *li) 981 { 982 int t; 983 984 /* 985 * Make sure that other people can't open the 986 * slave side of the connection. 987 */ 988 (void) chown(li, 0, 0); 989 (void) chmod(li, 0600); 990 991 #if (!defined(__BEOS__) && !defined(__HAIKU__)) 992 (void) revoke(li); 993 #endif 994 995 t = open(line, O_RDWR|O_NOCTTY); 996 997 if (t < 0) 998 return(-1); 999 1000 return(t); 1001 } 1002 1003 1004 #if (defined(__BEOS__) || defined(__HAIKU__)) 1005 /* taken from DragonFly's telnetd */ 1006 int 1007 login_tty(int t) 1008 { 1009 if (setsid() < 0) { 1010 fatalperror(net, "setsid()"); 1011 } 1012 1013 /* 1014 * We get our controlling tty assigned as a side-effect 1015 * of opening up a tty device. But on BSD based systems, 1016 * this only happens if our process group is zero. The 1017 * setsid() call above may have set our pgrp, so clear 1018 * it out before opening the tty... 1019 */ 1020 setpgid(0, 0); 1021 close(open(line, O_RDWR)); 1022 1023 setenv("TTY", line, 1); 1024 1025 if (t != 0) 1026 (void) dup2(t, 0); 1027 if (t != 1) 1028 (void) dup2(t, 1); 1029 if (t != 2) 1030 (void) dup2(t, 2); 1031 if (t > 2) 1032 close(t); 1033 return(0); 1034 } 1035 #endif /* __BEOS__ */ 1036 1037 /* 1038 * startslave(host) 1039 * 1040 * Given a hostname, do whatever 1041 * is necessary to startup the login process on the slave side of the pty. 1042 */ 1043 1044 /* ARGSUSED */ 1045 void 1046 startslave(char *host, int autologin, char *autoname) 1047 { 1048 int i; 1049 1050 #ifdef AUTHENTICATION 1051 if (!autoname || !autoname[0]) 1052 autologin = 0; 1053 1054 if (autologin < auth_level) { 1055 fatal(net, "Authorization failed"); 1056 exit(1); 1057 } 1058 #endif 1059 1060 1061 if ((i = fork()) < 0) 1062 fatalperror(net, "fork"); 1063 if (i) { 1064 } else { 1065 getptyslave(); 1066 start_login(host, autologin, autoname); 1067 /*NOTREACHED*/ 1068 } 1069 } 1070 1071 void 1072 init_env(void) 1073 { 1074 char **envp; 1075 1076 envp = envinit; 1077 if ((*envp = getenv("TZ"))) 1078 *envp++ -= 3; 1079 *envp = 0; 1080 environ = envinit; 1081 } 1082 1083 1084 /* 1085 * start_login(host) 1086 * 1087 * Assuming that we are now running as a child processes, this 1088 * function will turn us into the login process. 1089 */ 1090 1091 #ifndef AUTHENTICATION 1092 #define undef1 __unused 1093 #else 1094 #define undef1 1095 #endif 1096 1097 void 1098 start_login(char *host undef1, int autologin undef1, char *name undef1) 1099 { 1100 char **argv; 1101 1102 scrub_env(); 1103 1104 /* 1105 * -h : pass on name of host. 1106 * WARNING: -h is accepted by login if and only if 1107 * getuid() == 0. 1108 * -p : don't clobber the environment (so terminal type stays set). 1109 * 1110 * -f : force this login, he has already been authenticated 1111 */ 1112 argv = addarg(0, "login"); 1113 1114 #if !defined(NO_LOGIN_H) 1115 #ifdef AUTHENTICATION 1116 # if defined(NO_LOGIN_F) && defined(LOGIN_R) 1117 /* 1118 * Don't add the "-h host" option if we are going 1119 * to be adding the "-r host" option down below... 1120 */ 1121 if ((auth_level < 0) || (autologin != AUTH_VALID)) 1122 # endif 1123 { 1124 argv = addarg(argv, "-h"); 1125 argv = addarg(argv, host); 1126 } 1127 #endif /* AUTHENTICATION */ 1128 #endif 1129 #if !defined(NO_LOGIN_P) 1130 argv = addarg(argv, "-p"); 1131 #endif 1132 #ifdef LINEMODE 1133 /* 1134 * Set the environment variable "LINEMODE" to either 1135 * "real" or "kludge" if we are operating in either 1136 * real or kludge linemode. 1137 */ 1138 if (lmodetype == REAL_LINEMODE) 1139 setenv("LINEMODE", "real", 1); 1140 # ifdef KLUDGELINEMODE 1141 else if (lmodetype == KLUDGE_LINEMODE || lmodetype == KLUDGE_OK) 1142 setenv("LINEMODE", "kludge", 1); 1143 # endif 1144 #endif 1145 #ifdef BFTPDAEMON 1146 /* 1147 * Are we working as the bftp daemon? If so, then ask login 1148 * to start bftp instead of shell. 1149 */ 1150 if (bftpd) { 1151 argv = addarg(argv, "-e"); 1152 argv = addarg(argv, BFTPPATH); 1153 } else 1154 #endif 1155 #ifdef AUTHENTICATION 1156 if (auth_level >= 0 && autologin == AUTH_VALID) { 1157 # if !defined(NO_LOGIN_F) 1158 argv = addarg(argv, "-f"); 1159 argv = addarg(argv, "--"); 1160 argv = addarg(argv, name); 1161 # else 1162 # if defined(LOGIN_R) 1163 /* 1164 * We don't have support for "login -f", but we 1165 * can fool /bin/login into thinking that we are 1166 * rlogind, and allow us to log in without a 1167 * password. The rlogin protocol expects 1168 * local-user\0remote-user\0term/speed\0 1169 */ 1170 1171 if (pty > 2) { 1172 char *cp; 1173 char speed[128]; 1174 int isecho, israw, xpty, len; 1175 extern int def_rspeed; 1176 # ifndef LOGIN_HOST 1177 /* 1178 * Tell login that we are coming from "localhost". 1179 * If we passed in the real host name, then the 1180 * user would have to allow .rhost access from 1181 * every machine that they want authenticated 1182 * access to work from, which sort of defeats 1183 * the purpose of an authenticated login... 1184 * So, we tell login that the session is coming 1185 * from "localhost", and the user will only have 1186 * to have "localhost" in their .rhost file. 1187 */ 1188 # define LOGIN_HOST "localhost" 1189 # endif 1190 argv = addarg(argv, "-r"); 1191 argv = addarg(argv, LOGIN_HOST); 1192 1193 xpty = pty; 1194 pty = 0; 1195 init_termbuf(); 1196 isecho = tty_isecho(); 1197 israw = tty_israw(); 1198 if (isecho || !israw) { 1199 tty_setecho(0); /* Turn off echo */ 1200 tty_setraw(1); /* Turn on raw */ 1201 set_termbuf(); 1202 } 1203 len = strlen(name)+1; 1204 write(xpty, name, len); 1205 write(xpty, name, len); 1206 snprintf(speed, sizeof(speed), 1207 "%s/%d", (cp = getenv("TERM")) ? cp : "", 1208 (def_rspeed > 0) ? def_rspeed : 9600); 1209 len = strlen(speed)+1; 1210 write(xpty, speed, len); 1211 1212 if (isecho || !israw) { 1213 init_termbuf(); 1214 tty_setecho(isecho); 1215 tty_setraw(israw); 1216 set_termbuf(); 1217 if (!israw) { 1218 /* 1219 * Write a newline to ensure 1220 * that login will be able to 1221 * read the line... 1222 */ 1223 write(xpty, "\n", 1); 1224 } 1225 } 1226 pty = xpty; 1227 } 1228 # else 1229 argv = addarg(argv, "--"); 1230 argv = addarg(argv, name); 1231 # endif 1232 # endif 1233 } else 1234 #endif 1235 if (getenv("USER")) { 1236 argv = addarg(argv, "--"); 1237 argv = addarg(argv, getenv("USER")); 1238 #if defined(LOGIN_ARGS) && defined(NO_LOGIN_P) 1239 { 1240 char **cpp; 1241 for (cpp = environ; *cpp; cpp++) 1242 argv = addarg(argv, *cpp); 1243 } 1244 #endif 1245 /* 1246 * Assume that login will set the USER variable 1247 * correctly. For SysV systems, this means that 1248 * USER will no longer be set, just LOGNAME by 1249 * login. (The problem is that if the auto-login 1250 * fails, and the user then specifies a different 1251 * account name, he can get logged in with both 1252 * LOGNAME and USER in his environment, but the 1253 * USER value will be wrong. 1254 */ 1255 unsetenv("USER"); 1256 } 1257 #ifdef AUTHENTICATION 1258 #if defined(NO_LOGIN_F) && defined(LOGIN_R) 1259 if (pty > 2) 1260 close(pty); 1261 #endif 1262 #endif /* AUTHENTICATION */ 1263 closelog(); 1264 1265 if (altlogin == NULL) { 1266 altlogin = _PATH_LOGIN; 1267 } 1268 execv(altlogin, argv); 1269 1270 syslog(LOG_ERR, "%s: %m", altlogin); 1271 fatalperror(net, altlogin); 1272 /*NOTREACHED*/ 1273 } 1274 1275 static char ** 1276 addarg(char **argv, const char *val) 1277 { 1278 char **cpp; 1279 1280 if (argv == NULL) { 1281 /* 1282 * 10 entries, a leading length, and a null 1283 */ 1284 argv = (char **)malloc(sizeof(*argv) * 12); 1285 if (argv == NULL) 1286 return(NULL); 1287 *argv++ = (char *)10; 1288 *argv = (char *)0; 1289 } 1290 for (cpp = argv; *cpp; cpp++) 1291 ; 1292 if (cpp == &argv[(long)argv[-1]]) { 1293 --argv; 1294 *argv = (char *)((long)(*argv) + 10); 1295 argv = (char **)realloc(argv, sizeof(*argv)*((long)(*argv) + 2)); 1296 if (argv == NULL) 1297 return(NULL); 1298 argv++; 1299 cpp = &argv[(long)argv[-1] - 10]; 1300 } 1301 *cpp++ = strdup(val); 1302 *cpp = 0; 1303 return(argv); 1304 } 1305 1306 /* 1307 * scrub_env() 1308 * 1309 * We only accept the environment variables listed below. 1310 */ 1311 void 1312 scrub_env(void) 1313 { 1314 static const char *rej[] = { 1315 "TERMCAP=/", 1316 NULL 1317 }; 1318 1319 static const char *acc[] = { 1320 "XAUTH=", "XAUTHORITY=", "DISPLAY=", 1321 "TERM=", 1322 "EDITOR=", 1323 "PAGER=", 1324 "LOGNAME=", 1325 "POSIXLY_CORRECT=", 1326 "PRINTER=", 1327 NULL 1328 }; 1329 1330 char **cpp, **cpp2; 1331 const char **p; 1332 1333 for (cpp2 = cpp = environ; *cpp; cpp++) { 1334 int reject_it = 0; 1335 1336 for(p = rej; *p; p++) 1337 if(strncmp(*cpp, *p, strlen(*p)) == 0) { 1338 reject_it = 1; 1339 break; 1340 } 1341 if (reject_it) 1342 continue; 1343 1344 for(p = acc; *p; p++) 1345 if(strncmp(*cpp, *p, strlen(*p)) == 0) 1346 break; 1347 if(*p != NULL) 1348 *cpp2++ = *cpp; 1349 } 1350 *cpp2 = NULL; 1351 } 1352 1353 /* 1354 * cleanup() 1355 * 1356 * This is the routine to call when we are all through, to 1357 * clean up anything that needs to be cleaned up. 1358 */ 1359 /* ARGSUSED */ 1360 void 1361 cleanup(int sig __unused) 1362 { 1363 char *p; 1364 sigset_t mask; 1365 1366 p = line + sizeof(_PATH_DEV) - 1; 1367 /* 1368 * Block all signals before clearing the utmp entry. We don't want to 1369 * be called again after calling logout() and then not add the wtmp 1370 * entry because of not finding the corresponding entry in utmp. 1371 */ 1372 sigfillset(&mask); 1373 sigprocmask(SIG_SETMASK, &mask, NULL); 1374 #if (!defined(__BEOS__) && !defined(__HAIKU__)) 1375 if (logout(p)) 1376 logwtmp(p, "", ""); 1377 (void)chmod(line, 0666); 1378 (void)chown(line, 0, 0); 1379 *p = 'p'; 1380 (void)chmod(line, 0666); 1381 (void)chown(line, 0, 0); 1382 #endif 1383 (void) shutdown(net, 2); 1384 _exit(1); 1385 } 1386