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optr.c revision 1.1.1.1 
      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[] = "@(#)optr.c	8.2 (Berkeley) 1/6/94";
     36 #endif /* not lint */
     37 
     38 #include <sys/param.h>
     39 #include <sys/wait.h>
     40 #include <sys/time.h>
     41 
     42 #include <errno.h>
     43 #include <fstab.h>
     44 #include <grp.h>
     45 #include <signal.h>
     46 #include <stdio.h>
     47 #ifdef __STDC__
     48 #include <stdlib.h>
     49 #include <string.h>
     50 #include <stdarg.h>
     51 #endif
     52 #include <tzfile.h>
     53 #ifdef __STDC__
     54 #include <unistd.h>
     55 #endif
     56 #include <utmp.h>
     57 #ifndef __STDC__
     58 #include <varargs.h>
     59 #endif
     60 
     61 #include "dump.h"
     62 #include "pathnames.h"
     63 
     64 void	alarmcatch __P((/* int, int */));
     65 int	datesort __P((const void *, const void *));
     66 static	void sendmes __P((char *, char *));
     67 
     68 /*
     69  *	Query the operator; This previously-fascist piece of code
     70  *	no longer requires an exact response.
     71  *	It is intended to protect dump aborting by inquisitive
     72  *	people banging on the console terminal to see what is
     73  *	happening which might cause dump to croak, destroying
     74  *	a large number of hours of work.
     75  *
     76  *	Every 2 minutes we reprint the message, alerting others
     77  *	that dump needs attention.
     78  */
     79 static	int timeout;
     80 static	char *attnmessage;		/* attention message */
     81 
     82 int
     83 query(question)
     84 	char	*question;
     85 {
     86 	char	replybuffer[64];
     87 	int	back, errcount;
     88 	FILE	*mytty;
     89 
     90 	if ((mytty = fopen(_PATH_TTY, "r")) == NULL)
     91 		quit("fopen on %s fails: %s\n", _PATH_TTY, strerror(errno));
     92 	attnmessage = question;
     93 	timeout = 0;
     94 	alarmcatch();
     95 	back = -1;
     96 	errcount = 0;
     97 	do {
     98 		if (fgets(replybuffer, 63, mytty) == NULL) {
     99 			clearerr(mytty);
    100 			if (++errcount > 30)	/* XXX	ugly */
    101 				quit("excessive operator query failures\n");
    102 		} else if (replybuffer[0] == 'y' || replybuffer[0] == 'Y') {
    103 			back = 1;
    104 		} else if (replybuffer[0] == 'n' || replybuffer[0] == 'N') {
    105 			back = 0;
    106 		} else {
    107 			(void) fprintf(stderr,
    108 			    "  DUMP: \"Yes\" or \"No\"?\n");
    109 			(void) fprintf(stderr,
    110 			    "  DUMP: %s: (\"yes\" or \"no\") ", question);
    111 		}
    112 	} while (back < 0);
    113 
    114 	/*
    115 	 *	Turn off the alarm, and reset the signal to trap out..
    116 	 */
    117 	(void) alarm(0);
    118 	if (signal(SIGALRM, sig) == SIG_IGN)
    119 		signal(SIGALRM, SIG_IGN);
    120 	(void) fclose(mytty);
    121 	return(back);
    122 }
    123 
    124 char lastmsg[100];
    125 
    126 /*
    127  *	Alert the console operator, and enable the alarm clock to
    128  *	sleep for 2 minutes in case nobody comes to satisfy dump
    129  */
    130 void
    131 alarmcatch()
    132 {
    133 	if (notify == 0) {
    134 		if (timeout == 0)
    135 			(void) fprintf(stderr,
    136 			    "  DUMP: %s: (\"yes\" or \"no\") ",
    137 			    attnmessage);
    138 		else
    139 			msgtail("\7\7");
    140 	} else {
    141 		if (timeout) {
    142 			msgtail("\n");
    143 			broadcast("");		/* just print last msg */
    144 		}
    145 		(void) fprintf(stderr,"  DUMP: %s: (\"yes\" or \"no\") ",
    146 		    attnmessage);
    147 	}
    148 	signal(SIGALRM, alarmcatch);
    149 	(void) alarm(120);
    150 	timeout = 1;
    151 }
    152 
    153 /*
    154  *	Here if an inquisitive operator interrupts the dump program
    155  */
    156 void
    157 interrupt(signo)
    158 	int signo;
    159 {
    160 	msg("Interrupt received.\n");
    161 	if (query("Do you want to abort dump?"))
    162 		dumpabort(0);
    163 }
    164 
    165 /*
    166  *	The following variables and routines manage alerting
    167  *	operators to the status of dump.
    168  *	This works much like wall(1) does.
    169  */
    170 struct	group *gp;
    171 
    172 /*
    173  *	Get the names from the group entry "operator" to notify.
    174  */
    175 void
    176 set_operators()
    177 {
    178 	if (!notify)		/*not going to notify*/
    179 		return;
    180 	gp = getgrnam(OPGRENT);
    181 	(void) endgrent();
    182 	if (gp == NULL) {
    183 		msg("No group entry for %s.\n", OPGRENT);
    184 		notify = 0;
    185 		return;
    186 	}
    187 }
    188 
    189 struct tm *localclock;
    190 
    191 /*
    192  *	We fork a child to do the actual broadcasting, so
    193  *	that the process control groups are not messed up
    194  */
    195 void
    196 broadcast(message)
    197 	char	*message;
    198 {
    199 	time_t		clock;
    200 	FILE	*f_utmp;
    201 	struct	utmp	utmp;
    202 	char	**np;
    203 	int	pid, s;
    204 
    205 	if (!notify || gp == NULL)
    206 		return;
    207 
    208 	switch (pid = fork()) {
    209 	case -1:
    210 		return;
    211 	case 0:
    212 		break;
    213 	default:
    214 		while (wait(&s) != pid)
    215 			continue;
    216 		return;
    217 	}
    218 
    219 	clock = time((time_t *)0);
    220 	localclock = localtime(&clock);
    221 
    222 	if ((f_utmp = fopen(_PATH_UTMP, "r")) == NULL) {
    223 		msg("Cannot open %s: %s\n", _PATH_UTMP, strerror(errno));
    224 		return;
    225 	}
    226 
    227 	while (!feof(f_utmp)) {
    228 		if (fread((char *) &utmp, sizeof (struct utmp), 1, f_utmp) != 1)
    229 			break;
    230 		if (utmp.ut_name[0] == 0)
    231 			continue;
    232 		for (np = gp->gr_mem; *np; np++) {
    233 			if (strncmp(*np, utmp.ut_name, sizeof(utmp.ut_name)) != 0)
    234 				continue;
    235 			/*
    236 			 *	Do not send messages to operators on dialups
    237 			 */
    238 			if (strncmp(utmp.ut_line, DIALUP, strlen(DIALUP)) == 0)
    239 				continue;
    240 #ifdef DEBUG
    241 			msg("Message to %s at %s\n", *np, utmp.ut_line);
    242 #endif
    243 			sendmes(utmp.ut_line, message);
    244 		}
    245 	}
    246 	(void) fclose(f_utmp);
    247 	Exit(0);	/* the wait in this same routine will catch this */
    248 	/* NOTREACHED */
    249 }
    250 
    251 static void
    252 sendmes(tty, message)
    253 	char *tty, *message;
    254 {
    255 	char t[50], buf[BUFSIZ];
    256 	register char *cp;
    257 	int lmsg = 1;
    258 	FILE *f_tty;
    259 
    260 	(void) strcpy(t, _PATH_DEV);
    261 	(void) strcat(t, tty);
    262 
    263 	if ((f_tty = fopen(t, "w")) != NULL) {
    264 		setbuf(f_tty, buf);
    265 		(void) fprintf(f_tty,
    266 		    "\n\
    267 \7\7\7Message from the dump program to all operators at %d:%02d ...\r\n\n\
    268 DUMP: NEEDS ATTENTION: ",
    269 		    localclock->tm_hour, localclock->tm_min);
    270 		for (cp = lastmsg; ; cp++) {
    271 			if (*cp == '\0') {
    272 				if (lmsg) {
    273 					cp = message;
    274 					if (*cp == '\0')
    275 						break;
    276 					lmsg = 0;
    277 				} else
    278 					break;
    279 			}
    280 			if (*cp == '\n')
    281 				(void) putc('\r', f_tty);
    282 			(void) putc(*cp, f_tty);
    283 		}
    284 		(void) fclose(f_tty);
    285 	}
    286 }
    287 
    288 /*
    289  *	print out an estimate of the amount of time left to do the dump
    290  */
    291 
    292 time_t	tschedule = 0;
    293 
    294 void
    295 timeest()
    296 {
    297 	time_t	tnow, deltat;
    298 
    299 	(void) time((time_t *) &tnow);
    300 	if (tnow >= tschedule) {
    301 		tschedule = tnow + 300;
    302 		if (blockswritten < 500)
    303 			return;
    304 		deltat = tstart_writing - tnow +
    305 			(1.0 * (tnow - tstart_writing))
    306 			/ blockswritten * tapesize;
    307 		msg("%3.2f%% done, finished in %d:%02d\n",
    308 			(blockswritten * 100.0) / tapesize,
    309 			deltat / 3600, (deltat % 3600) / 60);
    310 	}
    311 }
    312 
    313 void
    314 #if __STDC__
    315 msg(const char *fmt, ...)
    316 #else
    317 msg(fmt, va_alist)
    318 	char *fmt;
    319 	va_dcl
    320 #endif
    321 {
    322 	va_list ap;
    323 
    324 	(void) fprintf(stderr,"  DUMP: ");
    325 #ifdef TDEBUG
    326 	(void) fprintf(stderr, "pid=%d ", getpid());
    327 #endif
    328 #if __STDC__
    329 	va_start(ap, fmt);
    330 #else
    331 	va_start(ap);
    332 #endif
    333 	(void) vfprintf(stderr, fmt, ap);
    334 	(void) fflush(stdout);
    335 	(void) fflush(stderr);
    336 	(void) vsprintf(lastmsg, fmt, ap);
    337 	va_end(ap);
    338 }
    339 
    340 void
    341 #if __STDC__
    342 msgtail(const char *fmt, ...)
    343 #else
    344 msgtail(fmt, va_alist)
    345 	char *fmt;
    346 	va_dcl
    347 #endif
    348 {
    349 	va_list ap;
    350 #if __STDC__
    351 	va_start(ap, fmt);
    352 #else
    353 	va_start(ap);
    354 #endif
    355 	(void) vfprintf(stderr, fmt, ap);
    356 	va_end(ap);
    357 }
    358 
    359 void
    360 #if __STDC__
    361 quit(const char *fmt, ...)
    362 #else
    363 quit(fmt, va_alist)
    364 	char *fmt;
    365 	va_dcl
    366 #endif
    367 {
    368 	va_list ap;
    369 
    370 	(void) fprintf(stderr,"  DUMP: ");
    371 #ifdef TDEBUG
    372 	(void) fprintf(stderr, "pid=%d ", getpid());
    373 #endif
    374 #if __STDC__
    375 	va_start(ap, fmt);
    376 #else
    377 	va_start(ap);
    378 #endif
    379 	(void) vfprintf(stderr, fmt, ap);
    380 	va_end(ap);
    381 	(void) fflush(stdout);
    382 	(void) fflush(stderr);
    383 	dumpabort(0);
    384 }
    385 
    386 /*
    387  *	Tell the operator what has to be done;
    388  *	we don't actually do it
    389  */
    390 
    391 struct fstab *
    392 allocfsent(fs)
    393 	register struct fstab *fs;
    394 {
    395 	register struct fstab *new;
    396 
    397 	new = (struct fstab *)malloc(sizeof (*fs));
    398 	if (new == NULL ||
    399 	    (new->fs_file = strdup(fs->fs_file)) == NULL ||
    400 	    (new->fs_type = strdup(fs->fs_type)) == NULL ||
    401 	    (new->fs_spec = strdup(fs->fs_spec)) == NULL)
    402 		quit("%s\n", strerror(errno));
    403 	new->fs_passno = fs->fs_passno;
    404 	new->fs_freq = fs->fs_freq;
    405 	return (new);
    406 }
    407 
    408 struct	pfstab {
    409 	struct	pfstab *pf_next;
    410 	struct	fstab *pf_fstab;
    411 };
    412 
    413 static	struct pfstab *table;
    414 
    415 void
    416 getfstab()
    417 {
    418 	register struct fstab *fs;
    419 	register struct pfstab *pf;
    420 
    421 	if (setfsent() == 0) {
    422 		msg("Can't open %s for dump table information: %s\n",
    423 		    _PATH_FSTAB, strerror(errno));
    424 		return;
    425 	}
    426 	while ((fs = getfsent()) != NULL) {
    427 		if (strcmp(fs->fs_type, FSTAB_RW) &&
    428 		    strcmp(fs->fs_type, FSTAB_RO) &&
    429 		    strcmp(fs->fs_type, FSTAB_RQ))
    430 			continue;
    431 		fs = allocfsent(fs);
    432 		if ((pf = (struct pfstab *)malloc(sizeof (*pf))) == NULL)
    433 			quit("%s\n", strerror(errno));
    434 		pf->pf_fstab = fs;
    435 		pf->pf_next = table;
    436 		table = pf;
    437 	}
    438 	(void) endfsent();
    439 }
    440 
    441 /*
    442  * Search in the fstab for a file name.
    443  * This file name can be either the special or the path file name.
    444  *
    445  * The entries in the fstab are the BLOCK special names, not the
    446  * character special names.
    447  * The caller of fstabsearch assures that the character device
    448  * is dumped (that is much faster)
    449  *
    450  * The file name can omit the leading '/'.
    451  */
    452 struct fstab *
    453 fstabsearch(key)
    454 	char *key;
    455 {
    456 	register struct pfstab *pf;
    457 	register struct fstab *fs;
    458 	char *rn;
    459 
    460 	for (pf = table; pf != NULL; pf = pf->pf_next) {
    461 		fs = pf->pf_fstab;
    462 		if (strcmp(fs->fs_file, key) == 0 ||
    463 		    strcmp(fs->fs_spec, key) == 0)
    464 			return (fs);
    465 		rn = rawname(fs->fs_spec);
    466 		if (rn != NULL && strcmp(rn, key) == 0)
    467 			return (fs);
    468 		if (key[0] != '/') {
    469 			if (*fs->fs_spec == '/' &&
    470 			    strcmp(fs->fs_spec + 1, key) == 0)
    471 				return (fs);
    472 			if (*fs->fs_file == '/' &&
    473 			    strcmp(fs->fs_file + 1, key) == 0)
    474 				return (fs);
    475 		}
    476 	}
    477 	return (NULL);
    478 }
    479 
    480 /*
    481  *	Tell the operator what to do
    482  */
    483 void
    484 lastdump(arg)
    485 	char	arg;	/* w ==> just what to do; W ==> most recent dumps */
    486 {
    487 	register int i;
    488 	register struct fstab *dt;
    489 	register struct dumpdates *dtwalk;
    490 	char *lastname, *date;
    491 	int dumpme;
    492 	time_t tnow;
    493 
    494 	(void) time(&tnow);
    495 	getfstab();		/* /etc/fstab input */
    496 	initdumptimes();	/* /etc/dumpdates input */
    497 	qsort((char *) ddatev, nddates, sizeof(struct dumpdates *), datesort);
    498 
    499 	if (arg == 'w')
    500 		(void) printf("Dump these file systems:\n");
    501 	else
    502 		(void) printf("Last dump(s) done (Dump '>' file systems):\n");
    503 	lastname = "??";
    504 	ITITERATE(i, dtwalk) {
    505 		if (strncmp(lastname, dtwalk->dd_name,
    506 		    sizeof(dtwalk->dd_name)) == 0)
    507 			continue;
    508 		date = (char *)ctime(&dtwalk->dd_ddate);
    509 		date[16] = '\0';	/* blast away seconds and year */
    510 		lastname = dtwalk->dd_name;
    511 		dt = fstabsearch(dtwalk->dd_name);
    512 		dumpme = (dt != NULL &&
    513 		    dt->fs_freq != 0 &&
    514 		    dtwalk->dd_ddate < tnow - (dt->fs_freq * SECSPERDAY));
    515 		if (arg != 'w' || dumpme)
    516 			(void) printf(
    517 			    "%c %8s\t(%6s) Last dump: Level %c, Date %s\n",
    518 			    dumpme && (arg != 'w') ? '>' : ' ',
    519 			    dtwalk->dd_name,
    520 			    dt ? dt->fs_file : "",
    521 			    dtwalk->dd_level,
    522 			    date);
    523 	}
    524 }
    525 
    526 int
    527 datesort(a1, a2)
    528 	const void *a1, *a2;
    529 {
    530 	struct dumpdates *d1 = *(struct dumpdates **)a1;
    531 	struct dumpdates *d2 = *(struct dumpdates **)a2;
    532 	int diff;
    533 
    534 	diff = strncmp(d1->dd_name, d2->dd_name, sizeof(d1->dd_name));
    535 	if (diff == 0)
    536 		return (d2->dd_ddate - d1->dd_ddate);
    537 	return (diff);
    538 }
    539