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main.c revision 1.17 
      1 /*-
      2  * Copyright (c) 1980, 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 #ifndef lint
     35 static char copyright[] =
     36 "@(#) Copyright (c) 1980, 1993\n\
     37 	The Regents of the University of California.  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 /*static char sccsid[] = "from: @(#)main.c	8.1 (Berkeley) 6/20/93";*/
     42 static char rcsid[] = "$Id: main.c,v 1.17 1996/05/15 23:46:52 jtc Exp $";
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 #include <sys/stat.h>
     47 #include <termios.h>
     48 #include <sys/ioctl.h>
     49 #include <sys/resource.h>
     50 #include <sys/utsname.h>
     51 #include <errno.h>
     52 #include <signal.h>
     53 #include <fcntl.h>
     54 #include <time.h>
     55 #include <ctype.h>
     56 #include <fcntl.h>
     57 #include <setjmp.h>
     58 #include <signal.h>
     59 #include <stdlib.h>
     60 #include <string.h>
     61 #include <syslog.h>
     62 #include <time.h>
     63 #include <unistd.h>
     64 #include <util.h>
     65 
     66 #include "gettytab.h"
     67 #include "pathnames.h"
     68 #include "extern.h"
     69 
     70 /*
     71  * Set the amount of running time that getty should accumulate
     72  * before deciding that something is wrong and exit.
     73  */
     74 #define GETTY_TIMEOUT	60 /* seconds */
     75 
     76 struct termios tmode, omode;
     77 
     78 int crmod, digit, lower, upper;
     79 
     80 char	hostname[MAXHOSTNAMELEN];
     81 struct	utsname kerninfo;
     82 char	name[16];
     83 char	dev[] = _PATH_DEV;
     84 char	ttyn[32];
     85 char	*portselector();
     86 char	*ttyname();
     87 
     88 #define	OBUFSIZ		128
     89 #define	TABBUFSIZ	512
     90 
     91 char	defent[TABBUFSIZ];
     92 char	tabent[TABBUFSIZ];
     93 
     94 char	*env[128];
     95 
     96 char partab[] = {
     97 	0001,0201,0201,0001,0201,0001,0001,0201,
     98 	0202,0004,0003,0205,0005,0206,0201,0001,
     99 	0201,0001,0001,0201,0001,0201,0201,0001,
    100 	0001,0201,0201,0001,0201,0001,0001,0201,
    101 	0200,0000,0000,0200,0000,0200,0200,0000,
    102 	0000,0200,0200,0000,0200,0000,0000,0200,
    103 	0000,0200,0200,0000,0200,0000,0000,0200,
    104 	0200,0000,0000,0200,0000,0200,0200,0000,
    105 	0200,0000,0000,0200,0000,0200,0200,0000,
    106 	0000,0200,0200,0000,0200,0000,0000,0200,
    107 	0000,0200,0200,0000,0200,0000,0000,0200,
    108 	0200,0000,0000,0200,0000,0200,0200,0000,
    109 	0000,0200,0200,0000,0200,0000,0000,0200,
    110 	0200,0000,0000,0200,0000,0200,0200,0000,
    111 	0200,0000,0000,0200,0000,0200,0200,0000,
    112 	0000,0200,0200,0000,0200,0000,0000,0201
    113 };
    114 
    115 #define	ERASE	tmode.c_cc[VERASE]
    116 #define	KILL	tmode.c_cc[VKILL]
    117 #define	EOT	tmode.c_cc[VEOF]
    118 
    119 jmp_buf timeout;
    120 
    121 static void
    122 dingdong()
    123 {
    124 
    125 	alarm(0);
    126 	signal(SIGALRM, SIG_DFL);
    127 	longjmp(timeout, 1);
    128 }
    129 
    130 jmp_buf	intrupt;
    131 
    132 static void
    133 interrupt()
    134 {
    135 
    136 	signal(SIGINT, interrupt);
    137 	longjmp(intrupt, 1);
    138 }
    139 
    140 /*
    141  * Action to take when getty is running too long.
    142  */
    143 void
    144 timeoverrun(signo)
    145 	int signo;
    146 {
    147 
    148 	syslog(LOG_ERR, "getty exiting due to excessive running time\n");
    149 	exit(1);
    150 }
    151 
    152 static int	getname __P((void));
    153 static void	oflush __P((void));
    154 static void	prompt __P((void));
    155 static void	putchr __P((int));
    156 static void	putf __P((char *));
    157 static void	putpad __P((char *));
    158 static void	puts __P((char *));
    159 
    160 int
    161 main(argc, argv)
    162 	int argc;
    163 	char *argv[];
    164 {
    165 	extern char **environ;
    166 	char *tname;
    167 	long allflags;
    168 	int repcnt = 0, failopenlogged = 0;
    169 	struct rlimit limit;
    170 
    171 	signal(SIGINT, SIG_IGN);
    172 /*
    173 	signal(SIGQUIT, SIG_DFL);
    174 */
    175 	openlog("getty", LOG_ODELAY|LOG_CONS|LOG_PID, LOG_AUTH);
    176 	gethostname(hostname, sizeof(hostname));
    177 	if (hostname[0] == '\0')
    178 		strcpy(hostname, "Amnesiac");
    179 	uname(&kerninfo);
    180 
    181 	/*
    182 	 * Limit running time to deal with broken or dead lines.
    183 	 */
    184 	(void)signal(SIGXCPU, timeoverrun);
    185 	limit.rlim_max = RLIM_INFINITY;
    186 	limit.rlim_cur = GETTY_TIMEOUT;
    187 	(void)setrlimit(RLIMIT_CPU, &limit);
    188 
    189 	/*
    190 	 * The following is a work around for vhangup interactions
    191 	 * which cause great problems getting window systems started.
    192 	 * If the tty line is "-", we do the old style getty presuming
    193 	 * that the file descriptors are already set up for us.
    194 	 * J. Gettys - MIT Project Athena.
    195 	 */
    196 	if (argc <= 2 || strcmp(argv[2], "-") == 0)
    197 	    strcpy(ttyn, ttyname(0));
    198 	else {
    199 	    int i;
    200 
    201 	    strcpy(ttyn, dev);
    202 	    strncat(ttyn, argv[2], sizeof(ttyn)-sizeof(dev));
    203 	    if (strcmp(argv[0], "+") != 0) {
    204 		chown(ttyn, 0, 0);
    205 		chmod(ttyn, 0600);
    206 		revoke(ttyn);
    207 		/*
    208 		 * Delay the open so DTR stays down long enough to be detected.
    209 		 */
    210 		sleep(2);
    211 		while ((i = open(ttyn, O_RDWR)) == -1) {
    212 			if ((repcnt % 10 == 0) &&
    213 			    (errno != ENXIO || !failopenlogged)) {
    214 				syslog(LOG_ERR, "%s: %m", ttyn);
    215 				closelog();
    216 				failopenlogged = 1;
    217 			}
    218 			repcnt++;
    219 			sleep(60);
    220 		}
    221 		login_tty(i);
    222 	    }
    223 	}
    224 
    225 	/* Start with default tty settings */
    226 	if (tcgetattr(0, &tmode) < 0) {
    227 		syslog(LOG_ERR, "%s: %m", ttyn);
    228 		exit(1);
    229 	}
    230 	omode = tmode;
    231 
    232 	gettable("default", defent);
    233 	gendefaults();
    234 	tname = "default";
    235 	if (argc > 1)
    236 		tname = argv[1];
    237 	for (;;) {
    238 		int off;
    239 
    240 		gettable(tname, tabent);
    241 		if (OPset || EPset || APset)
    242 			APset++, OPset++, EPset++;
    243 		setdefaults();
    244 		off = 0;
    245 		(void)tcflush(0, TCIOFLUSH);	/* clear out the crap */
    246 		ioctl(0, FIONBIO, &off);	/* turn off non-blocking mode */
    247 		ioctl(0, FIOASYNC, &off);	/* ditto for async mode */
    248 
    249 		if (IS)
    250 			cfsetispeed(&tmode, IS);
    251 		else if (SP)
    252 			cfsetispeed(&tmode, SP);
    253 		if (OS)
    254 			cfsetospeed(&tmode, OS);
    255 		else if (SP)
    256 			cfsetospeed(&tmode, SP);
    257 		setflags(0);
    258 		setchars();
    259 		if (tcsetattr(0, TCSANOW, &tmode) < 0) {
    260 			syslog(LOG_ERR, "%s: %m", ttyn);
    261 			exit(1);
    262 		}
    263 		if (AB) {
    264 			extern char *autobaud();
    265 
    266 			tname = autobaud();
    267 			continue;
    268 		}
    269 		if (PS) {
    270 			tname = portselector();
    271 			continue;
    272 		}
    273 		if (CL && *CL)
    274 			putpad(CL);
    275 		edithost(HE);
    276 		if (IM && *IM)
    277 			putf(IM);
    278 		if (setjmp(timeout)) {
    279 			tmode.c_ispeed = tmode.c_ospeed = 0;
    280 			(void)tcsetattr(0, TCSANOW, &tmode);
    281 			exit(1);
    282 		}
    283 		if (TO) {
    284 			signal(SIGALRM, dingdong);
    285 			alarm(TO);
    286 		}
    287 		if (getname()) {
    288 			register int i;
    289 
    290 			oflush();
    291 			alarm(0);
    292 			signal(SIGALRM, SIG_DFL);
    293 			if (name[0] == '-') {
    294 				puts("user names may not start with '-'.");
    295 				continue;
    296 			}
    297 			if (!(upper || lower || digit))
    298 				continue;
    299 			setflags(2);
    300 			if (crmod) {
    301 				tmode.c_iflag |= ICRNL;
    302 				tmode.c_oflag |= ONLCR;
    303 			}
    304 #if XXX
    305 			if (upper || UC)
    306 				tmode.sg_flags |= LCASE;
    307 			if (lower || LC)
    308 				tmode.sg_flags &= ~LCASE;
    309 #endif
    310 			if (tcsetattr(0, TCSANOW, &tmode) < 0) {
    311 				syslog(LOG_ERR, "%s: %m", ttyn);
    312 				exit(1);
    313 			}
    314 			signal(SIGINT, SIG_DFL);
    315 			for (i = 0; environ[i] != (char *)0; i++)
    316 				env[i] = environ[i];
    317 			makeenv(&env[i]);
    318 
    319 			limit.rlim_max = RLIM_INFINITY;
    320 			limit.rlim_cur = RLIM_INFINITY;
    321 			(void)setrlimit(RLIMIT_CPU, &limit);
    322 			execle(LO, "login", "-p", "--", name, (char *)0, env);
    323 			syslog(LOG_ERR, "%s: %m", LO);
    324 			exit(1);
    325 		}
    326 		alarm(0);
    327 		signal(SIGALRM, SIG_DFL);
    328 		signal(SIGINT, SIG_IGN);
    329 		if (NX && *NX)
    330 			tname = NX;
    331 	}
    332 }
    333 
    334 static int
    335 getname()
    336 {
    337 	register int c;
    338 	register char *np;
    339 	char cs;
    340 
    341 	/*
    342 	 * Interrupt may happen if we use CBREAK mode
    343 	 */
    344 	if (setjmp(intrupt)) {
    345 		signal(SIGINT, SIG_IGN);
    346 		return (0);
    347 	}
    348 	signal(SIGINT, interrupt);
    349 	setflags(1);
    350 	prompt();
    351 	if (PF > 0) {
    352 		oflush();
    353 		sleep(PF);
    354 		PF = 0;
    355 	}
    356 	if (tcsetattr(0, TCSANOW, &tmode) < 0) {
    357 		syslog(LOG_ERR, "%s: %m", ttyn);
    358 		exit(1);
    359 	}
    360 	crmod = digit = lower = upper = 0;
    361 	np = name;
    362 	for (;;) {
    363 		oflush();
    364 		if (read(STDIN_FILENO, &cs, 1) <= 0)
    365 			exit(0);
    366 		if ((c = cs&0177) == 0)
    367 			return (0);
    368 		if (c == EOT)
    369 			exit(1);
    370 		if (c == '\r' || c == '\n' || np >= &name[sizeof name]) {
    371 			putf("\r\n");
    372 			break;
    373 		}
    374 		if (islower(c))
    375 			lower = 1;
    376 		else if (isupper(c))
    377 			upper = 1;
    378 		else if (c == ERASE || c == '#' || c == '\b') {
    379 			if (np > name) {
    380 				np--;
    381 				if (cfgetospeed(&tmode) >= 1200)
    382 					puts("\b \b");
    383 				else
    384 					putchr(cs);
    385 			}
    386 			continue;
    387 		} else if (c == KILL || c == '@') {
    388 			putchr(cs);
    389 			putchr('\r');
    390 			if (cfgetospeed(&tmode) < 1200)
    391 				putchr('\n');
    392 			/* this is the way they do it down under ... */
    393 			else if (np > name)
    394 				puts("                                     \r");
    395 			prompt();
    396 			np = name;
    397 			continue;
    398 		} else if (isdigit(c))
    399 			digit++;
    400 		if (IG && (c <= ' ' || c > 0176))
    401 			continue;
    402 		*np++ = c;
    403 		putchr(cs);
    404 	}
    405 	signal(SIGINT, SIG_IGN);
    406 	*np = 0;
    407 	if (c == '\r')
    408 		crmod = 1;
    409 	if (upper && !lower && !LC || UC)
    410 		for (np = name; *np; np++)
    411 			if (isupper(*np))
    412 				*np = tolower(*np);
    413 	return (1);
    414 }
    415 
    416 static void
    417 putpad(s)
    418 	register char *s;
    419 {
    420 	register pad = 0;
    421 	speed_t ospeed = cfgetospeed(&tmode);
    422 
    423 	if (isdigit(*s)) {
    424 		while (isdigit(*s)) {
    425 			pad *= 10;
    426 			pad += *s++ - '0';
    427 		}
    428 		pad *= 10;
    429 		if (*s == '.' && isdigit(s[1])) {
    430 			pad += s[1] - '0';
    431 			s += 2;
    432 		}
    433 	}
    434 
    435 	puts(s);
    436 	/*
    437 	 * If no delay needed, or output speed is
    438 	 * not comprehensible, then don't try to delay.
    439 	 */
    440 	if (pad == 0 || ospeed <= 0)
    441 		return;
    442 
    443 	/*
    444 	 * Round up by a half a character frame, and then do the delay.
    445 	 * Too bad there are no user program accessible programmed delays.
    446 	 * Transmitting pad characters slows many terminals down and also
    447 	 * loads the system.
    448 	 */
    449 	pad = (pad * ospeed + 50000) / 100000;
    450 	while (pad--)
    451 		putchr(*PC);
    452 }
    453 
    454 static void
    455 puts(s)
    456 	register char *s;
    457 {
    458 	while (*s)
    459 		putchr(*s++);
    460 }
    461 
    462 char	outbuf[OBUFSIZ];
    463 int	obufcnt = 0;
    464 
    465 static void
    466 putchr(cc)
    467 	int cc;
    468 {
    469 	char c;
    470 
    471 	c = cc;
    472 	if (!NP) {
    473 		c |= partab[c&0177] & 0200;
    474 		if (OP)
    475 			c ^= 0200;
    476 	}
    477 	if (!UB) {
    478 		outbuf[obufcnt++] = c;
    479 		if (obufcnt >= OBUFSIZ)
    480 			oflush();
    481 	} else
    482 		write(STDOUT_FILENO, &c, 1);
    483 }
    484 
    485 static void
    486 oflush()
    487 {
    488 	if (obufcnt)
    489 		write(STDOUT_FILENO, outbuf, obufcnt);
    490 	obufcnt = 0;
    491 }
    492 
    493 static void
    494 prompt()
    495 {
    496 
    497 	putf(LM);
    498 	if (CO)
    499 		putchr('\n');
    500 }
    501 
    502 static void
    503 putf(cp)
    504 	register char *cp;
    505 {
    506 	extern char editedhost[];
    507 	time_t t;
    508 	char *slash, db[100];
    509 
    510 	while (*cp) {
    511 		if (*cp != '%') {
    512 			putchr(*cp++);
    513 			continue;
    514 		}
    515 		switch (*++cp) {
    516 
    517 		case 't':
    518 			slash = strrchr(ttyn, '/');
    519 			if (slash == (char *) 0)
    520 				puts(ttyn);
    521 			else
    522 				puts(&slash[1]);
    523 			break;
    524 
    525 		case 'h':
    526 			puts(editedhost);
    527 			break;
    528 
    529 		case 'd': {
    530 			static char fmt[] = "%l:% %p on %A, %d %B %Y";
    531 
    532 			fmt[4] = 'M';		/* I *hate* SCCS... */
    533 			(void)time(&t);
    534 			(void)strftime(db, sizeof(db), fmt, localtime(&t));
    535 			puts(db);
    536 			break;
    537 
    538 		case 's':
    539 			puts(kerninfo.sysname);
    540 			break;
    541 
    542 		case 'm':
    543 			puts(kerninfo.machine);
    544 			break;
    545 
    546 		case 'r':
    547 			puts(kerninfo.release);
    548 			break;
    549 
    550 		case 'v':
    551 			puts(kerninfo.version);
    552 			break;
    553 		}
    554 
    555 		case '%':
    556 			putchr('%');
    557 			break;
    558 		}
    559 		cp++;
    560 	}
    561 }
    562