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main.c revision 1.5 
      1 /*-
      2  * Copyright (c) 1980 The Regents of the University of California.
      3  * 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 char copyright[] =
     36 "@(#) Copyright (c) 1980 The Regents of the University of California.\n\
     37  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 /*static char sccsid[] = "from: @(#)main.c	5.16 (Berkeley) 3/27/91";*/
     42 static char rcsid[] = "$Id: main.c,v 1.5 1994/03/09 04:59:59 cgd Exp $";
     43 #endif /* not lint */
     44 
     45 #define USE_OLD_TTY
     46 
     47 #include <sys/param.h>
     48 #include <sys/stat.h>
     49 #include <sys/utsname.h>
     50 #include <signal.h>
     51 #include <fcntl.h>
     52 #include <sgtty.h>
     53 #include <time.h>
     54 #include <ctype.h>
     55 #include <setjmp.h>
     56 #include <syslog.h>
     57 #include <unistd.h>
     58 #include <ctype.h>
     59 #include <stdlib.h>
     60 #include <string.h>
     61 #include "gettytab.h"
     62 #include "pathnames.h"
     63 
     64 struct	sgttyb tmode = {
     65 	0, 0, CERASE, CKILL, 0
     66 };
     67 struct	tchars tc = {
     68 	CINTR, CQUIT, CSTART,
     69 	CSTOP, CEOF, CBRK,
     70 };
     71 struct	ltchars ltc = {
     72 	CSUSP, CDSUSP, CRPRNT,
     73 	CFLUSH, CWERASE, CLNEXT
     74 };
     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.sg_erase
    114 #define	KILL	tmode.sg_kill
    115 #define	EOT	tc.t_eofc
    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 main(argc, argv)
    139 	int argc;
    140 	char **argv;
    141 {
    142 	extern	char **environ;
    143 	char *tname;
    144 	long allflags;
    145 	int repcnt = 0;
    146 
    147 	signal(SIGINT, SIG_IGN);
    148 /*
    149 	signal(SIGQUIT, SIG_DFL);
    150 */
    151 	openlog("getty", LOG_ODELAY|LOG_CONS, LOG_AUTH);
    152 	gethostname(hostname, sizeof(hostname));
    153 	if (hostname[0] == '\0')
    154 		strcpy(hostname, "Amnesiac");
    155 	uname(&kerninfo);
    156 	/*
    157 	 * The following is a work around for vhangup interactions
    158 	 * which cause great problems getting window systems started.
    159 	 * If the tty line is "-", we do the old style getty presuming
    160 	 * that the file descriptors are already set up for us.
    161 	 * J. Gettys - MIT Project Athena.
    162 	 */
    163 	if (argc <= 2 || strcmp(argv[2], "-") == 0)
    164 	    strcpy(ttyn, ttyname(0));
    165 	else {
    166 	    int i;
    167 
    168 	    strcpy(ttyn, dev);
    169 	    strncat(ttyn, argv[2], sizeof(ttyn)-sizeof(dev));
    170 	    if (strcmp(argv[0], "+") != 0) {
    171 		chown(ttyn, 0, 0);
    172 		chmod(ttyn, 0600);
    173 		revoke(ttyn);
    174 		/*
    175 		 * Delay the open so DTR stays down long enough to be detected.
    176 		 */
    177 		sleep(2);
    178 		while ((i = open(ttyn, O_RDWR)) == -1) {
    179 			if (repcnt % 10 == 0) {
    180 				syslog(LOG_ERR, "%s: %m", ttyn);
    181 				closelog();
    182 			}
    183 			repcnt++;
    184 			sleep(60);
    185 		}
    186 		login_tty(i);
    187 	    }
    188 	}
    189 
    190 	gettable("default", defent);
    191 	gendefaults();
    192 	tname = "default";
    193 	if (argc > 1)
    194 		tname = argv[1];
    195 	for (;;) {
    196 		int ldisp = OTTYDISC;
    197 		int off = 0;
    198 
    199 		gettable(tname, tabent);
    200 		if (OPset || EPset || APset)
    201 			APset++, OPset++, EPset++;
    202 		setdefaults();
    203 		ioctl(0, TIOCFLUSH, 0);		/* clear out the crap */
    204 		ioctl(0, FIONBIO, &off);	/* turn off non-blocking mode */
    205 		ioctl(0, FIOASYNC, &off);	/* ditto for async mode */
    206 		if (IS)
    207 			tmode.sg_ispeed = speed(IS);
    208 		else if (SP)
    209 			tmode.sg_ispeed = speed(SP);
    210 		if (OS)
    211 			tmode.sg_ospeed = speed(OS);
    212 		else if (SP)
    213 			tmode.sg_ospeed = speed(SP);
    214 		tmode.sg_flags = setflags(0);
    215 		ioctl(0, TIOCSETP, &tmode);
    216 		setchars();
    217 		ioctl(0, TIOCSETC, &tc);
    218 		if (HC)
    219 			ioctl(0, TIOCHPCL, 0);
    220 		if (AB) {
    221 			extern char *autobaud();
    222 
    223 			tname = autobaud();
    224 			continue;
    225 		}
    226 		if (PS) {
    227 			tname = portselector();
    228 			continue;
    229 		}
    230 		if (CL && *CL)
    231 			putpad(CL);
    232 		edithost(HE);
    233 		if (IM && *IM)
    234 			putf(IM);
    235 		if (setjmp(timeout)) {
    236 			tmode.sg_ispeed = tmode.sg_ospeed = 0;
    237 			ioctl(0, TIOCSETP, &tmode);
    238 			exit(1);
    239 		}
    240 		if (TO) {
    241 			signal(SIGALRM, dingdong);
    242 			alarm(TO);
    243 		}
    244 		if (getname()) {
    245 			register int i;
    246 
    247 			oflush();
    248 			alarm(0);
    249 			signal(SIGALRM, SIG_DFL);
    250 			if (name[0] == '-') {
    251 				puts("user names may not start with '-'.");
    252 				continue;
    253 			}
    254 			if (!(upper || lower || digit))
    255 				continue;
    256 			allflags = setflags(2);
    257 			tmode.sg_flags = allflags & 0xffff;
    258 			allflags >>= 16;
    259 			if (crmod || NL)
    260 				tmode.sg_flags |= CRMOD;
    261 			if (upper || UC)
    262 				tmode.sg_flags |= LCASE;
    263 			if (lower || LC)
    264 				tmode.sg_flags &= ~LCASE;
    265 			ioctl(0, TIOCSETP, &tmode);
    266 			ioctl(0, TIOCSLTC, &ltc);
    267 			ioctl(0, TIOCLSET, &allflags);
    268 			signal(SIGINT, SIG_DFL);
    269 			for (i = 0; environ[i] != (char *)0; i++)
    270 				env[i] = environ[i];
    271 			makeenv(&env[i]);
    272 			execle(LO, "login", "-p", name, (char *) 0, env);
    273 			syslog(LOG_ERR, "%s: %m", LO);
    274 			exit(1);
    275 		}
    276 		alarm(0);
    277 		signal(SIGALRM, SIG_DFL);
    278 		signal(SIGINT, SIG_IGN);
    279 		if (NX && *NX)
    280 			tname = NX;
    281 	}
    282 }
    283 
    284 getname()
    285 {
    286 	register int c;
    287 	register char *np;
    288 	char cs;
    289 
    290 	/*
    291 	 * Interrupt may happen if we use CBREAK mode
    292 	 */
    293 	if (setjmp(intrupt)) {
    294 		signal(SIGINT, SIG_IGN);
    295 		return (0);
    296 	}
    297 	signal(SIGINT, interrupt);
    298 	tmode.sg_flags = setflags(0);
    299 	ioctl(0, TIOCSETP, &tmode);
    300 	tmode.sg_flags = setflags(1);
    301 	prompt();
    302 	if (PF > 0) {
    303 		oflush();
    304 		sleep(PF);
    305 		PF = 0;
    306 	}
    307 	ioctl(0, TIOCSETP, &tmode);
    308 	crmod = digit = lower = upper = 0;
    309 	np = name;
    310 	for (;;) {
    311 		oflush();
    312 		if (read(STDIN_FILENO, &cs, 1) <= 0)
    313 			exit(0);
    314 		if ((c = cs&0177) == 0)
    315 			return (0);
    316 		if (c == EOT)
    317 			exit(1);
    318 		if (c == '\r' || c == '\n' || np >= &name[sizeof name]) {
    319 			putf("\r\n");
    320 			break;
    321 		}
    322 		if (islower(c))
    323 			lower = 1;
    324 		else if (isupper(c))
    325 			upper = 1;
    326 		else if (c == ERASE || c == '#' || c == '\b') {
    327 			if (np > name) {
    328 				np--;
    329 				if (tmode.sg_ospeed >= B1200)
    330 					puts("\b \b");
    331 				else
    332 					putchr(cs);
    333 			}
    334 			continue;
    335 		} else if (c == KILL || c == '@') {
    336 			putchr(cs);
    337 			putchr('\r');
    338 			if (tmode.sg_ospeed < B1200)
    339 				putchr('\n');
    340 			/* this is the way they do it down under ... */
    341 			else if (np > name)
    342 				puts("                                     \r");
    343 			prompt();
    344 			np = name;
    345 			continue;
    346 		} else if (isdigit(c))
    347 			digit++;
    348 		if (IG && (c <= ' ' || c > 0176))
    349 			continue;
    350 		*np++ = c;
    351 		putchr(cs);
    352 	}
    353 	signal(SIGINT, SIG_IGN);
    354 	*np = 0;
    355 	if (c == '\r')
    356 		crmod = 1;
    357 	if (upper && !lower && !LC || UC)
    358 		for (np = name; *np; np++)
    359 			if (isupper(*np))
    360 				*np = tolower(*np);
    361 	return (1);
    362 }
    363 
    364 static
    365 short	tmspc10[] = {
    366 	0, 2000, 1333, 909, 743, 666, 500, 333, 166, 83, 55, 41, 20, 10, 5, 15
    367 };
    368 
    369 putpad(s)
    370 	register char *s;
    371 {
    372 	register pad = 0;
    373 	register mspc10;
    374 
    375 	if (isdigit(*s)) {
    376 		while (isdigit(*s)) {
    377 			pad *= 10;
    378 			pad += *s++ - '0';
    379 		}
    380 		pad *= 10;
    381 		if (*s == '.' && isdigit(s[1])) {
    382 			pad += s[1] - '0';
    383 			s += 2;
    384 		}
    385 	}
    386 
    387 	puts(s);
    388 	/*
    389 	 * If no delay needed, or output speed is
    390 	 * not comprehensible, then don't try to delay.
    391 	 */
    392 	if (pad == 0)
    393 		return;
    394 	if (tmode.sg_ospeed <= 0 ||
    395 	    tmode.sg_ospeed >= (sizeof tmspc10 / sizeof tmspc10[0]))
    396 		return;
    397 
    398 	/*
    399 	 * Round up by a half a character frame, and then do the delay.
    400 	 * Too bad there are no user program accessible programmed delays.
    401 	 * Transmitting pad characters slows many terminals down and also
    402 	 * loads the system.
    403 	 */
    404 	mspc10 = tmspc10[tmode.sg_ospeed];
    405 	pad += mspc10 / 2;
    406 	for (pad /= mspc10; pad > 0; pad--)
    407 		putchr(*PC);
    408 }
    409 
    410 puts(s)
    411 	register char *s;
    412 {
    413 	while (*s)
    414 		putchr(*s++);
    415 }
    416 
    417 char	outbuf[OBUFSIZ];
    418 int	obufcnt = 0;
    419 
    420 putchr(cc)
    421 {
    422 	char c;
    423 
    424 	c = cc;
    425 	if (!NP) {
    426 		c |= partab[c&0177] & 0200;
    427 		if (OP)
    428 			c ^= 0200;
    429 	}
    430 	if (!UB) {
    431 		outbuf[obufcnt++] = c;
    432 		if (obufcnt >= OBUFSIZ)
    433 			oflush();
    434 	} else
    435 		write(STDOUT_FILENO, &c, 1);
    436 }
    437 
    438 oflush()
    439 {
    440 	if (obufcnt)
    441 		write(STDOUT_FILENO, outbuf, obufcnt);
    442 	obufcnt = 0;
    443 }
    444 
    445 prompt()
    446 {
    447 
    448 	putf(LM);
    449 	if (CO)
    450 		putchr('\n');
    451 }
    452 
    453 putf(cp)
    454 	register char *cp;
    455 {
    456 	extern char editedhost[];
    457 	time_t t;
    458 	char *slash, db[100];
    459 
    460 	while (*cp) {
    461 		if (*cp != '%') {
    462 			putchr(*cp++);
    463 			continue;
    464 		}
    465 		switch (*++cp) {
    466 
    467 		case 't':
    468 			slash = rindex(ttyn, '/');
    469 			if (slash == (char *) 0)
    470 				puts(ttyn);
    471 			else
    472 				puts(&slash[1]);
    473 			break;
    474 
    475 		case 'h':
    476 			puts(editedhost);
    477 			break;
    478 
    479 		case 'd': {
    480 			static char fmt[] = "%l:% %P on %A, %d %B %Y";
    481 
    482 			fmt[4] = 'M';		/* I *hate* SCCS... */
    483 			(void)time(&t);
    484 			(void)strftime(db, sizeof(db), fmt, localtime(&t));
    485 			puts(db);
    486 			break;
    487 
    488 		case 's':
    489 			puts(kerninfo.sysname);
    490 			break;
    491 
    492 		case 'm':
    493 			puts(kerninfo.machine);
    494 			break;
    495 
    496 		case 'r':
    497 			puts(kerninfo.release);
    498 			break;
    499 
    500 		case 'v':
    501 			puts(kerninfo.version);
    502 			break;
    503 		}
    504 
    505 		case '%':
    506 			putchr('%');
    507 			break;
    508 		}
    509 		cp++;
    510 	}
    511 }
    512