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optr.c revision 1.2 
      1 /*-
      2  * Copyright (c) 1980, 1988, 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 sccsid[] = "from: @(#)optr.c	8.2 (Berkeley) 1/6/94";*/
     36 static char *rcsid = "$Id: optr.c,v 1.2 1994/06/08 18:57:37 mycroft Exp $";
     37 #endif /* not lint */
     38 
     39 #include <sys/param.h>
     40 #include <sys/wait.h>
     41 #include <sys/time.h>
     42 
     43 #include <errno.h>
     44 #include <fstab.h>
     45 #include <grp.h>
     46 #include <signal.h>
     47 #include <stdio.h>
     48 #ifdef __STDC__
     49 #include <stdlib.h>
     50 #include <string.h>
     51 #include <stdarg.h>
     52 #endif
     53 #include <tzfile.h>
     54 #ifdef __STDC__
     55 #include <unistd.h>
     56 #endif
     57 #include <utmp.h>
     58 #ifndef __STDC__
     59 #include <varargs.h>
     60 #endif
     61 
     62 #include "dump.h"
     63 #include "pathnames.h"
     64 
     65 void	alarmcatch __P((/* int, int */));
     66 int	datesort __P((const void *, const void *));
     67 static	void sendmes __P((char *, char *));
     68 
     69 /*
     70  *	Query the operator; This previously-fascist piece of code
     71  *	no longer requires an exact response.
     72  *	It is intended to protect dump aborting by inquisitive
     73  *	people banging on the console terminal to see what is
     74  *	happening which might cause dump to croak, destroying
     75  *	a large number of hours of work.
     76  *
     77  *	Every 2 minutes we reprint the message, alerting others
     78  *	that dump needs attention.
     79  */
     80 static	int timeout;
     81 static	char *attnmessage;		/* attention message */
     82 
     83 int
     84 query(question)
     85 	char	*question;
     86 {
     87 	char	replybuffer[64];
     88 	int	back, errcount;
     89 	FILE	*mytty;
     90 
     91 	if ((mytty = fopen(_PATH_TTY, "r")) == NULL)
     92 		quit("fopen on %s fails: %s\n", _PATH_TTY, strerror(errno));
     93 	attnmessage = question;
     94 	timeout = 0;
     95 	alarmcatch();
     96 	back = -1;
     97 	errcount = 0;
     98 	do {
     99 		if (fgets(replybuffer, 63, mytty) == NULL) {
    100 			clearerr(mytty);
    101 			if (++errcount > 30)	/* XXX	ugly */
    102 				quit("excessive operator query failures\n");
    103 		} else if (replybuffer[0] == 'y' || replybuffer[0] == 'Y') {
    104 			back = 1;
    105 		} else if (replybuffer[0] == 'n' || replybuffer[0] == 'N') {
    106 			back = 0;
    107 		} else {
    108 			(void) fprintf(stderr,
    109 			    "  DUMP: \"Yes\" or \"No\"?\n");
    110 			(void) fprintf(stderr,
    111 			    "  DUMP: %s: (\"yes\" or \"no\") ", question);
    112 		}
    113 	} while (back < 0);
    114 
    115 	/*
    116 	 *	Turn off the alarm, and reset the signal to trap out..
    117 	 */
    118 	(void) alarm(0);
    119 	if (signal(SIGALRM, sig) == SIG_IGN)
    120 		signal(SIGALRM, SIG_IGN);
    121 	(void) fclose(mytty);
    122 	return(back);
    123 }
    124 
    125 char lastmsg[100];
    126 
    127 /*
    128  *	Alert the console operator, and enable the alarm clock to
    129  *	sleep for 2 minutes in case nobody comes to satisfy dump
    130  */
    131 void
    132 alarmcatch()
    133 {
    134 	if (notify == 0) {
    135 		if (timeout == 0)
    136 			(void) fprintf(stderr,
    137 			    "  DUMP: %s: (\"yes\" or \"no\") ",
    138 			    attnmessage);
    139 		else
    140 			msgtail("\7\7");
    141 	} else {
    142 		if (timeout) {
    143 			msgtail("\n");
    144 			broadcast("");		/* just print last msg */
    145 		}
    146 		(void) fprintf(stderr,"  DUMP: %s: (\"yes\" or \"no\") ",
    147 		    attnmessage);
    148 	}
    149 	signal(SIGALRM, alarmcatch);
    150 	(void) alarm(120);
    151 	timeout = 1;
    152 }
    153 
    154 /*
    155  *	Here if an inquisitive operator interrupts the dump program
    156  */
    157 void
    158 interrupt(signo)
    159 	int signo;
    160 {
    161 	msg("Interrupt received.\n");
    162 	if (query("Do you want to abort dump?"))
    163 		dumpabort(0);
    164 }
    165 
    166 /*
    167  *	The following variables and routines manage alerting
    168  *	operators to the status of dump.
    169  *	This works much like wall(1) does.
    170  */
    171 struct	group *gp;
    172 
    173 /*
    174  *	Get the names from the group entry "operator" to notify.
    175  */
    176 void
    177 set_operators()
    178 {
    179 	if (!notify)		/*not going to notify*/
    180 		return;
    181 	gp = getgrnam(OPGRENT);
    182 	(void) endgrent();
    183 	if (gp == NULL) {
    184 		msg("No group entry for %s.\n", OPGRENT);
    185 		notify = 0;
    186 		return;
    187 	}
    188 }
    189 
    190 struct tm *localclock;
    191 
    192 /*
    193  *	We fork a child to do the actual broadcasting, so
    194  *	that the process control groups are not messed up
    195  */
    196 void
    197 broadcast(message)
    198 	char	*message;
    199 {
    200 	time_t		clock;
    201 	FILE	*f_utmp;
    202 	struct	utmp	utmp;
    203 	char	**np;
    204 	int	pid, s;
    205 
    206 	if (!notify || gp == NULL)
    207 		return;
    208 
    209 	switch (pid = fork()) {
    210 	case -1:
    211 		return;
    212 	case 0:
    213 		break;
    214 	default:
    215 		while (wait(&s) != pid)
    216 			continue;
    217 		return;
    218 	}
    219 
    220 	clock = time((time_t *)0);
    221 	localclock = localtime(&clock);
    222 
    223 	if ((f_utmp = fopen(_PATH_UTMP, "r")) == NULL) {
    224 		msg("Cannot open %s: %s\n", _PATH_UTMP, strerror(errno));
    225 		return;
    226 	}
    227 
    228 	while (!feof(f_utmp)) {
    229 		if (fread((char *) &utmp, sizeof (struct utmp), 1, f_utmp) != 1)
    230 			break;
    231 		if (utmp.ut_name[0] == 0)
    232 			continue;
    233 		for (np = gp->gr_mem; *np; np++) {
    234 			if (strncmp(*np, utmp.ut_name, sizeof(utmp.ut_name)) != 0)
    235 				continue;
    236 			/*
    237 			 *	Do not send messages to operators on dialups
    238 			 */
    239 			if (strncmp(utmp.ut_line, DIALUP, strlen(DIALUP)) == 0)
    240 				continue;
    241 #ifdef DEBUG
    242 			msg("Message to %s at %s\n", *np, utmp.ut_line);
    243 #endif
    244 			sendmes(utmp.ut_line, message);
    245 		}
    246 	}
    247 	(void) fclose(f_utmp);
    248 	Exit(0);	/* the wait in this same routine will catch this */
    249 	/* NOTREACHED */
    250 }
    251 
    252 static void
    253 sendmes(tty, message)
    254 	char *tty, *message;
    255 {
    256 	char t[50], buf[BUFSIZ];
    257 	register char *cp;
    258 	int lmsg = 1;
    259 	FILE *f_tty;
    260 
    261 	(void) strcpy(t, _PATH_DEV);
    262 	(void) strcat(t, tty);
    263 
    264 	if ((f_tty = fopen(t, "w")) != NULL) {
    265 		setbuf(f_tty, buf);
    266 		(void) fprintf(f_tty,
    267 		    "\n\
    268 \7\7\7Message from the dump program to all operators at %d:%02d ...\r\n\n\
    269 DUMP: NEEDS ATTENTION: ",
    270 		    localclock->tm_hour, localclock->tm_min);
    271 		for (cp = lastmsg; ; cp++) {
    272 			if (*cp == '\0') {
    273 				if (lmsg) {
    274 					cp = message;
    275 					if (*cp == '\0')
    276 						break;
    277 					lmsg = 0;
    278 				} else
    279 					break;
    280 			}
    281 			if (*cp == '\n')
    282 				(void) putc('\r', f_tty);
    283 			(void) putc(*cp, f_tty);
    284 		}
    285 		(void) fclose(f_tty);
    286 	}
    287 }
    288 
    289 /*
    290  *	print out an estimate of the amount of time left to do the dump
    291  */
    292 
    293 time_t	tschedule = 0;
    294 
    295 void
    296 timeest()
    297 {
    298 	time_t	tnow, deltat;
    299 
    300 	(void) time((time_t *) &tnow);
    301 	if (tnow >= tschedule) {
    302 		tschedule = tnow + 300;
    303 		if (blockswritten < 500)
    304 			return;
    305 		deltat = tstart_writing - tnow +
    306 			(1.0 * (tnow - tstart_writing))
    307 			/ blockswritten * tapesize;
    308 		msg("%3.2f%% done, finished in %d:%02d\n",
    309 			(blockswritten * 100.0) / tapesize,
    310 			deltat / 3600, (deltat % 3600) / 60);
    311 	}
    312 }
    313 
    314 void
    315 #if __STDC__
    316 msg(const char *fmt, ...)
    317 #else
    318 msg(fmt, va_alist)
    319 	char *fmt;
    320 	va_dcl
    321 #endif
    322 {
    323 	va_list ap;
    324 
    325 	(void) fprintf(stderr,"  DUMP: ");
    326 #ifdef TDEBUG
    327 	(void) fprintf(stderr, "pid=%d ", getpid());
    328 #endif
    329 #if __STDC__
    330 	va_start(ap, fmt);
    331 #else
    332 	va_start(ap);
    333 #endif
    334 	(void) vfprintf(stderr, fmt, ap);
    335 	(void) fflush(stdout);
    336 	(void) fflush(stderr);
    337 	(void) vsprintf(lastmsg, fmt, ap);
    338 	va_end(ap);
    339 }
    340 
    341 void
    342 #if __STDC__
    343 msgtail(const char *fmt, ...)
    344 #else
    345 msgtail(fmt, va_alist)
    346 	char *fmt;
    347 	va_dcl
    348 #endif
    349 {
    350 	va_list ap;
    351 #if __STDC__
    352 	va_start(ap, fmt);
    353 #else
    354 	va_start(ap);
    355 #endif
    356 	(void) vfprintf(stderr, fmt, ap);
    357 	va_end(ap);
    358 }
    359 
    360 void
    361 #if __STDC__
    362 quit(const char *fmt, ...)
    363 #else
    364 quit(fmt, va_alist)
    365 	char *fmt;
    366 	va_dcl
    367 #endif
    368 {
    369 	va_list ap;
    370 
    371 	(void) fprintf(stderr,"  DUMP: ");
    372 #ifdef TDEBUG
    373 	(void) fprintf(stderr, "pid=%d ", getpid());
    374 #endif
    375 #if __STDC__
    376 	va_start(ap, fmt);
    377 #else
    378 	va_start(ap);
    379 #endif
    380 	(void) vfprintf(stderr, fmt, ap);
    381 	va_end(ap);
    382 	(void) fflush(stdout);
    383 	(void) fflush(stderr);
    384 	dumpabort(0);
    385 }
    386 
    387 /*
    388  *	Tell the operator what has to be done;
    389  *	we don't actually do it
    390  */
    391 
    392 struct fstab *
    393 allocfsent(fs)
    394 	register struct fstab *fs;
    395 {
    396 	register struct fstab *new;
    397 
    398 	new = (struct fstab *)malloc(sizeof (*fs));
    399 	if (new == NULL ||
    400 	    (new->fs_file = strdup(fs->fs_file)) == NULL ||
    401 	    (new->fs_type = strdup(fs->fs_type)) == NULL ||
    402 	    (new->fs_spec = strdup(fs->fs_spec)) == NULL)
    403 		quit("%s\n", strerror(errno));
    404 	new->fs_passno = fs->fs_passno;
    405 	new->fs_freq = fs->fs_freq;
    406 	return (new);
    407 }
    408 
    409 struct	pfstab {
    410 	struct	pfstab *pf_next;
    411 	struct	fstab *pf_fstab;
    412 };
    413 
    414 static	struct pfstab *table;
    415 
    416 void
    417 getfstab()
    418 {
    419 	register struct fstab *fs;
    420 	register struct pfstab *pf;
    421 
    422 	if (setfsent() == 0) {
    423 		msg("Can't open %s for dump table information: %s\n",
    424 		    _PATH_FSTAB, strerror(errno));
    425 		return;
    426 	}
    427 	while ((fs = getfsent()) != NULL) {
    428 		if (strcmp(fs->fs_type, FSTAB_RW) &&
    429 		    strcmp(fs->fs_type, FSTAB_RO) &&
    430 		    strcmp(fs->fs_type, FSTAB_RQ))
    431 			continue;
    432 		fs = allocfsent(fs);
    433 		if ((pf = (struct pfstab *)malloc(sizeof (*pf))) == NULL)
    434 			quit("%s\n", strerror(errno));
    435 		pf->pf_fstab = fs;
    436 		pf->pf_next = table;
    437 		table = pf;
    438 	}
    439 	(void) endfsent();
    440 }
    441 
    442 /*
    443  * Search in the fstab for a file name.
    444  * This file name can be either the special or the path file name.
    445  *
    446  * The entries in the fstab are the BLOCK special names, not the
    447  * character special names.
    448  * The caller of fstabsearch assures that the character device
    449  * is dumped (that is much faster)
    450  *
    451  * The file name can omit the leading '/'.
    452  */
    453 struct fstab *
    454 fstabsearch(key)
    455 	char *key;
    456 {
    457 	register struct pfstab *pf;
    458 	register struct fstab *fs;
    459 	char *rn;
    460 
    461 	for (pf = table; pf != NULL; pf = pf->pf_next) {
    462 		fs = pf->pf_fstab;
    463 		if (strcmp(fs->fs_file, key) == 0 ||
    464 		    strcmp(fs->fs_spec, key) == 0)
    465 			return (fs);
    466 		rn = rawname(fs->fs_spec);
    467 		if (rn != NULL && strcmp(rn, key) == 0)
    468 			return (fs);
    469 		if (key[0] != '/') {
    470 			if (*fs->fs_spec == '/' &&
    471 			    strcmp(fs->fs_spec + 1, key) == 0)
    472 				return (fs);
    473 			if (*fs->fs_file == '/' &&
    474 			    strcmp(fs->fs_file + 1, key) == 0)
    475 				return (fs);
    476 		}
    477 	}
    478 	return (NULL);
    479 }
    480 
    481 /*
    482  *	Tell the operator what to do
    483  */
    484 void
    485 lastdump(arg)
    486 	char	arg;	/* w ==> just what to do; W ==> most recent dumps */
    487 {
    488 	register int i;
    489 	register struct fstab *dt;
    490 	register struct dumpdates *dtwalk;
    491 	char *lastname, *date;
    492 	int dumpme;
    493 	time_t tnow;
    494 
    495 	(void) time(&tnow);
    496 	getfstab();		/* /etc/fstab input */
    497 	initdumptimes();	/* /etc/dumpdates input */
    498 	qsort((char *) ddatev, nddates, sizeof(struct dumpdates *), datesort);
    499 
    500 	if (arg == 'w')
    501 		(void) printf("Dump these file systems:\n");
    502 	else
    503 		(void) printf("Last dump(s) done (Dump '>' file systems):\n");
    504 	lastname = "??";
    505 	ITITERATE(i, dtwalk) {
    506 		if (strncmp(lastname, dtwalk->dd_name,
    507 		    sizeof(dtwalk->dd_name)) == 0)
    508 			continue;
    509 		date = (char *)ctime(&dtwalk->dd_ddate);
    510 		date[16] = '\0';	/* blast away seconds and year */
    511 		lastname = dtwalk->dd_name;
    512 		dt = fstabsearch(dtwalk->dd_name);
    513 		dumpme = (dt != NULL &&
    514 		    dt->fs_freq != 0 &&
    515 		    dtwalk->dd_ddate < tnow - (dt->fs_freq * SECSPERDAY));
    516 		if (arg != 'w' || dumpme)
    517 			(void) printf(
    518 			    "%c %8s\t(%6s) Last dump: Level %c, Date %s\n",
    519 			    dumpme && (arg != 'w') ? '>' : ' ',
    520 			    dtwalk->dd_name,
    521 			    dt ? dt->fs_file : "",
    522 			    dtwalk->dd_level,
    523 			    date);
    524 	}
    525 }
    526 
    527 int
    528 datesort(a1, a2)
    529 	const void *a1, *a2;
    530 {
    531 	struct dumpdates *d1 = *(struct dumpdates **)a1;
    532 	struct dumpdates *d2 = *(struct dumpdates **)a2;
    533 	int diff;
    534 
    535 	diff = strncmp(d1->dd_name, d2->dd_name, sizeof(d1->dd_name));
    536 	if (diff == 0)
    537 		return (d2->dd_ddate - d1->dd_ddate);
    538 	return (diff);
    539 }
    540