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main.c revision 1.12 
      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 1.12 1994/09/05 09:09:43 pk Exp $";
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 #include <sys/stat.h>
     47 #include <sys/termios.h>
     48 #include <sys/ioctl.h>
     49 #include <sys/resource.h>
     50 #include <sys/utsname.h>
     51 #include <signal.h>
     52 #include <fcntl.h>
     53 #include <time.h>
     54 #include <ctype.h>
     55 #include <fcntl.h>
     56 #include <setjmp.h>
     57 #include <signal.h>
     58 #include <stdlib.h>
     59 #include <string.h>
     60 #include <syslog.h>
     61 #include <time.h>
     62 #include <unistd.h>
     63 
     64 #include "gettytab.h"
     65 #include "pathnames.h"
     66 #include "extern.h"
     67 
     68 /*
     69  * Set the amount of running time that getty should accumulate
     70  * before deciding that something is wrong and exit.
     71  */
     72 #define GETTY_TIMEOUT	60 /* seconds */
     73 
     74 struct termios tmode, omode;
     75 
     76 int crmod, digit, lower, upper;
     77 
     78 char	hostname[MAXHOSTNAMELEN];
     79 struct	utsname kerninfo;
     80 char	name[16];
     81 char	dev[] = _PATH_DEV;
     82 char	ttyn[32];
     83 char	*portselector();
     84 char	*ttyname();
     85 
     86 #define	OBUFSIZ		128
     87 #define	TABBUFSIZ	512
     88 
     89 char	defent[TABBUFSIZ];
     90 char	tabent[TABBUFSIZ];
     91 
     92 char	*env[128];
     93 
     94 char partab[] = {
     95 	0001,0201,0201,0001,0201,0001,0001,0201,
     96 	0202,0004,0003,0205,0005,0206,0201,0001,
     97 	0201,0001,0001,0201,0001,0201,0201,0001,
     98 	0001,0201,0201,0001,0201,0001,0001,0201,
     99 	0200,0000,0000,0200,0000,0200,0200,0000,
    100 	0000,0200,0200,0000,0200,0000,0000,0200,
    101 	0000,0200,0200,0000,0200,0000,0000,0200,
    102 	0200,0000,0000,0200,0000,0200,0200,0000,
    103 	0200,0000,0000,0200,0000,0200,0200,0000,
    104 	0000,0200,0200,0000,0200,0000,0000,0200,
    105 	0000,0200,0200,0000,0200,0000,0000,0200,
    106 	0200,0000,0000,0200,0000,0200,0200,0000,
    107 	0000,0200,0200,0000,0200,0000,0000,0200,
    108 	0200,0000,0000,0200,0000,0200,0200,0000,
    109 	0200,0000,0000,0200,0000,0200,0200,0000,
    110 	0000,0200,0200,0000,0200,0000,0000,0201
    111 };
    112 
    113 #define	ERASE	tmode.c_cc[VERASE]
    114 #define	KILL	tmode.c_cc[VKILL]
    115 #define	EOT	tmode.c_cc[VEOF]
    116 
    117 jmp_buf timeout;
    118 
    119 static void
    120 dingdong()
    121 {
    122 
    123 	alarm(0);
    124 	signal(SIGALRM, SIG_DFL);
    125 	longjmp(timeout, 1);
    126 }
    127 
    128 jmp_buf	intrupt;
    129 
    130 static void
    131 interrupt()
    132 {
    133 
    134 	signal(SIGINT, interrupt);
    135 	longjmp(intrupt, 1);
    136 }
    137 
    138 /*
    139  * Action to take when getty is running too long.
    140  */
    141 void
    142 timeoverrun(signo)
    143 	int signo;
    144 {
    145 
    146 	syslog(LOG_ERR, "getty exiting due to excessive running time\n");
    147 	exit(1);
    148 }
    149 
    150 static int	getname __P((void));
    151 static void	oflush __P((void));
    152 static void	prompt __P((void));
    153 static void	putchr __P((int));
    154 static void	putf __P((char *));
    155 static void	putpad __P((char *));
    156 static void	puts __P((char *));
    157 
    158 int
    159 main(argc, argv)
    160 	int argc;
    161 	char *argv[];
    162 {
    163 	extern char **environ;
    164 	char *tname;
    165 	long allflags;
    166 	int repcnt = 0;
    167 	struct rlimit limit;
    168 
    169 	signal(SIGINT, SIG_IGN);
    170 /*
    171 	signal(SIGQUIT, SIG_DFL);
    172 */
    173 	openlog("getty", LOG_ODELAY|LOG_CONS|LOG_PID, LOG_AUTH);
    174 	gethostname(hostname, sizeof(hostname));
    175 	if (hostname[0] == '\0')
    176 		strcpy(hostname, "Amnesiac");
    177 	uname(&kerninfo);
    178 
    179 	/*
    180 	 * Limit running time to deal with broken or dead lines.
    181 	 */
    182 	(void)signal(SIGXCPU, timeoverrun);
    183 	limit.rlim_max = RLIM_INFINITY;
    184 	limit.rlim_cur = GETTY_TIMEOUT;
    185 	(void)setrlimit(RLIMIT_CPU, &limit);
    186 
    187 	/*
    188 	 * The following is a work around for vhangup interactions
    189 	 * which cause great problems getting window systems started.
    190 	 * If the tty line is "-", we do the old style getty presuming
    191 	 * that the file descriptors are already set up for us.
    192 	 * J. Gettys - MIT Project Athena.
    193 	 */
    194 	if (argc <= 2 || strcmp(argv[2], "-") == 0)
    195 	    strcpy(ttyn, ttyname(0));
    196 	else {
    197 	    int i;
    198 
    199 	    strcpy(ttyn, dev);
    200 	    strncat(ttyn, argv[2], sizeof(ttyn)-sizeof(dev));
    201 	    if (strcmp(argv[0], "+") != 0) {
    202 		chown(ttyn, 0, 0);
    203 		chmod(ttyn, 0600);
    204 		revoke(ttyn);
    205 		/*
    206 		 * Delay the open so DTR stays down long enough to be detected.
    207 		 */
    208 		sleep(2);
    209 		while ((i = open(ttyn, O_RDWR)) == -1) {
    210 			if (repcnt % 10 == 0) {
    211 				syslog(LOG_ERR, "%s: %m", ttyn);
    212 				closelog();
    213 			}
    214 			repcnt++;
    215 			sleep(60);
    216 		}
    217 		login_tty(i);
    218 	    }
    219 	}
    220 
    221 	/* Start with default tty settings */
    222 	if (tcgetattr(0, &tmode) < 0) {
    223 		syslog(LOG_ERR, "%s: %m", ttyn);
    224 		exit(1);
    225 	}
    226 	omode = tmode;
    227 
    228 	gettable("default", defent);
    229 	gendefaults();
    230 	tname = "default";
    231 	if (argc > 1)
    232 		tname = argv[1];
    233 	for (;;) {
    234 		int off;
    235 
    236 		gettable(tname, tabent);
    237 		if (OPset || EPset || APset)
    238 			APset++, OPset++, EPset++;
    239 		setdefaults();
    240 		off = 0;
    241 		(void)tcflush(0, TCIOFLUSH);	/* clear out the crap */
    242 		ioctl(0, FIONBIO, &off);	/* turn off non-blocking mode */
    243 		ioctl(0, FIOASYNC, &off);	/* ditto for async mode */
    244 
    245 		if (IS)
    246 			cfsetispeed(&tmode, IS);
    247 		else if (SP)
    248 			cfsetispeed(&tmode, SP);
    249 		if (OS)
    250 			cfsetospeed(&tmode, OS);
    251 		else if (SP)
    252 			cfsetospeed(&tmode, SP);
    253 		setflags(0);
    254 		setchars();
    255 		if (tcsetattr(0, TCSANOW, &tmode) < 0) {
    256 			syslog(LOG_ERR, "%s: %m", ttyn);
    257 			exit(1);
    258 		}
    259 		if (AB) {
    260 			extern char *autobaud();
    261 
    262 			tname = autobaud();
    263 			continue;
    264 		}
    265 		if (PS) {
    266 			tname = portselector();
    267 			continue;
    268 		}
    269 		if (CL && *CL)
    270 			putpad(CL);
    271 		edithost(HE);
    272 		if (IM && *IM)
    273 			putf(IM);
    274 		if (setjmp(timeout)) {
    275 			tmode.c_ispeed = tmode.c_ospeed = 0;
    276 			(void)tcsetattr(0, TCSANOW, &tmode);
    277 			exit(1);
    278 		}
    279 		if (TO) {
    280 			signal(SIGALRM, dingdong);
    281 			alarm(TO);
    282 		}
    283 		if (getname()) {
    284 			register int i;
    285 
    286 			oflush();
    287 			alarm(0);
    288 			signal(SIGALRM, SIG_DFL);
    289 			if (name[0] == '-') {
    290 				puts("user names may not start with '-'.");
    291 				continue;
    292 			}
    293 			if (!(upper || lower || digit))
    294 				continue;
    295 			setflags(2);
    296 			if (crmod) {
    297 				tmode.c_iflag |= ICRNL;
    298 				tmode.c_oflag |= ONLCR;
    299 			}
    300 #if XXX
    301 			if (upper || UC)
    302 				tmode.sg_flags |= LCASE;
    303 			if (lower || LC)
    304 				tmode.sg_flags &= ~LCASE;
    305 #endif
    306 			if (tcsetattr(0, TCSANOW, &tmode) < 0) {
    307 				syslog(LOG_ERR, "%s: %m", ttyn);
    308 				exit(1);
    309 			}
    310 			signal(SIGINT, SIG_DFL);
    311 			for (i = 0; environ[i] != (char *)0; i++)
    312 				env[i] = environ[i];
    313 			makeenv(&env[i]);
    314 
    315 			limit.rlim_max = RLIM_INFINITY;
    316 			limit.rlim_cur = RLIM_INFINITY;
    317 			(void)setrlimit(RLIMIT_CPU, &limit);
    318 			execle(LO, "login", "-p", name, (char *) 0, env);
    319 			syslog(LOG_ERR, "%s: %m", LO);
    320 			exit(1);
    321 		}
    322 		alarm(0);
    323 		signal(SIGALRM, SIG_DFL);
    324 		signal(SIGINT, SIG_IGN);
    325 		if (NX && *NX)
    326 			tname = NX;
    327 	}
    328 }
    329 
    330 static int
    331 getname()
    332 {
    333 	register int c;
    334 	register char *np;
    335 	char cs;
    336 
    337 	/*
    338 	 * Interrupt may happen if we use CBREAK mode
    339 	 */
    340 	if (setjmp(intrupt)) {
    341 		signal(SIGINT, SIG_IGN);
    342 		return (0);
    343 	}
    344 	signal(SIGINT, interrupt);
    345 	setflags(1);
    346 	prompt();
    347 	if (PF > 0) {
    348 		oflush();
    349 		sleep(PF);
    350 		PF = 0;
    351 	}
    352 	if (tcsetattr(0, TCSANOW, &tmode) < 0) {
    353 		syslog(LOG_ERR, "%s: %m", ttyn);
    354 		exit(1);
    355 	}
    356 	crmod = digit = lower = upper = 0;
    357 	np = name;
    358 	for (;;) {
    359 		oflush();
    360 		if (read(STDIN_FILENO, &cs, 1) <= 0)
    361 			exit(0);
    362 		if ((c = cs&0177) == 0)
    363 			return (0);
    364 		if (c == EOT)
    365 			exit(1);
    366 		if (c == '\r' || c == '\n' || np >= &name[sizeof name]) {
    367 			putf("\r\n");
    368 			break;
    369 		}
    370 		if (islower(c))
    371 			lower = 1;
    372 		else if (isupper(c))
    373 			upper = 1;
    374 		else if (c == ERASE || c == '#' || c == '\b') {
    375 			if (np > name) {
    376 				np--;
    377 				if (cfgetospeed(&tmode) >= 1200)
    378 					puts("\b \b");
    379 				else
    380 					putchr(cs);
    381 			}
    382 			continue;
    383 		} else if (c == KILL || c == '@') {
    384 			putchr(cs);
    385 			putchr('\r');
    386 			if (cfgetospeed(&tmode) < 1200)
    387 				putchr('\n');
    388 			/* this is the way they do it down under ... */
    389 			else if (np > name)
    390 				puts("                                     \r");
    391 			prompt();
    392 			np = name;
    393 			continue;
    394 		} else if (isdigit(c))
    395 			digit++;
    396 		if (IG && (c <= ' ' || c > 0176))
    397 			continue;
    398 		*np++ = c;
    399 		putchr(cs);
    400 	}
    401 	signal(SIGINT, SIG_IGN);
    402 	*np = 0;
    403 	if (c == '\r')
    404 		crmod = 1;
    405 	if (upper && !lower && !LC || UC)
    406 		for (np = name; *np; np++)
    407 			if (isupper(*np))
    408 				*np = tolower(*np);
    409 	return (1);
    410 }
    411 
    412 static void
    413 putpad(s)
    414 	register char *s;
    415 {
    416 	register pad = 0;
    417 	speed_t ospeed = cfgetospeed(&tmode);
    418 
    419 	if (isdigit(*s)) {
    420 		while (isdigit(*s)) {
    421 			pad *= 10;
    422 			pad += *s++ - '0';
    423 		}
    424 		pad *= 10;
    425 		if (*s == '.' && isdigit(s[1])) {
    426 			pad += s[1] - '0';
    427 			s += 2;
    428 		}
    429 	}
    430 
    431 	puts(s);
    432 	/*
    433 	 * If no delay needed, or output speed is
    434 	 * not comprehensible, then don't try to delay.
    435 	 */
    436 	if (pad == 0 || ospeed <= 0)
    437 		return;
    438 
    439 	/*
    440 	 * Round up by a half a character frame, and then do the delay.
    441 	 * Too bad there are no user program accessible programmed delays.
    442 	 * Transmitting pad characters slows many terminals down and also
    443 	 * loads the system.
    444 	 */
    445 	pad = (pad * ospeed + 50000) / 100000;
    446 	while (pad--)
    447 		putchr(*PC);
    448 }
    449 
    450 static void
    451 puts(s)
    452 	register char *s;
    453 {
    454 	while (*s)
    455 		putchr(*s++);
    456 }
    457 
    458 char	outbuf[OBUFSIZ];
    459 int	obufcnt = 0;
    460 
    461 static void
    462 putchr(cc)
    463 	int cc;
    464 {
    465 	char c;
    466 
    467 	c = cc;
    468 	if (!NP) {
    469 		c |= partab[c&0177] & 0200;
    470 		if (OP)
    471 			c ^= 0200;
    472 	}
    473 	if (!UB) {
    474 		outbuf[obufcnt++] = c;
    475 		if (obufcnt >= OBUFSIZ)
    476 			oflush();
    477 	} else
    478 		write(STDOUT_FILENO, &c, 1);
    479 }
    480 
    481 static void
    482 oflush()
    483 {
    484 	if (obufcnt)
    485 		write(STDOUT_FILENO, outbuf, obufcnt);
    486 	obufcnt = 0;
    487 }
    488 
    489 static void
    490 prompt()
    491 {
    492 
    493 	putf(LM);
    494 	if (CO)
    495 		putchr('\n');
    496 }
    497 
    498 static void
    499 putf(cp)
    500 	register char *cp;
    501 {
    502 	extern char editedhost[];
    503 	time_t t;
    504 	char *slash, db[100];
    505 
    506 	while (*cp) {
    507 		if (*cp != '%') {
    508 			putchr(*cp++);
    509 			continue;
    510 		}
    511 		switch (*++cp) {
    512 
    513 		case 't':
    514 			slash = strrchr(ttyn, '/');
    515 			if (slash == (char *) 0)
    516 				puts(ttyn);
    517 			else
    518 				puts(&slash[1]);
    519 			break;
    520 
    521 		case 'h':
    522 			puts(editedhost);
    523 			break;
    524 
    525 		case 'd': {
    526 			static char fmt[] = "%l:% %P on %A, %d %B %Y";
    527 
    528 			fmt[4] = 'M';		/* I *hate* SCCS... */
    529 			(void)time(&t);
    530 			(void)strftime(db, sizeof(db), fmt, localtime(&t));
    531 			puts(db);
    532 			break;
    533 
    534 		case 's':
    535 			puts(kerninfo.sysname);
    536 			break;
    537 
    538 		case 'm':
    539 			puts(kerninfo.machine);
    540 			break;
    541 
    542 		case 'r':
    543 			puts(kerninfo.release);
    544 			break;
    545 
    546 		case 'v':
    547 			puts(kerninfo.version);
    548 			break;
    549 		}
    550 
    551 		case '%':
    552 			putchr('%');
    553 			break;
    554 		}
    555 		cp++;
    556 	}
    557 }
    558