static	char *sccsid = "@(#)dumpoptr.c	1.4 (Berkeley) 12/17/80";
#include "dump.h"

/*
 *	This is from /usr/include/grp.h
 *	That defined struct group, which conflicts
 *	with the struct group defined in param.h
 */
struct	Group { /* see getgrent(3) */
	char	*gr_name;
	char	*gr_passwd;
	int	gr_gid;
	char	**gr_mem;
};
struct	Group *getgrnam();
/*
 *	Query the operator; This fascist piece of code requires
 *	an exact response.
 *	It is intended to protect dump aborting by inquisitive
 *	people banging on the console terminal to see what is
 *	happening which might cause dump to croak, destroying
 *	a large number of hours of work.
 *
 *	Every 2 minutes we reprint the message, alerting others
 *	that dump needs attention.
 */
int	timeout;
char	*attnmessage;		/* attemtion message */
query(question)
	char	*question;
{
	char	replybuffer[64];
	int	back;
	FILE	*mytty;

	if ( (mytty = fopen("/dev/tty", "r")) == NULL){
		msg("fopen on /dev/tty fails\n");
		abort();
	}
	attnmessage = question;
	timeout = 0;
	alarmcatch();
	for(;;){
		if ( fgets(replybuffer, 63, mytty) == NULL){
			if (ferror(mytty)){
				clearerr(mytty);
				continue;
			}
		} else if ( (strcmp(replybuffer, "yes\n") == 0) ||
			    (strcmp(replybuffer, "Yes\n") == 0)){
				back = 1;
				goto done;
		} else if ( (strcmp(replybuffer, "no\n") == 0) ||
			    (strcmp(replybuffer, "No\n") == 0)){
				back = 0;
				goto done;
		} else {
			msg("\"Yes\" or \"No\" ONLY!\n");
			alarmcatch();
		}
	}
    done:
	/*
	 *	Turn off the alarm, and reset the signal to trap out..
	 */
	alarm(0);
	if (signal(SIGALRM, sigalrm) == SIG_IGN)
		signal(SIGALRM, SIG_IGN);
	fclose(mytty);
	return(back);
}
/*
 *	Alert the console operator, and enable the alarm clock to
 *	sleep for 2 minutes in case nobody comes to satisfy dump
 */
alarmcatch()
{
	if (timeout)
		msgtail("\n");
	msg("NEEDS ATTENTION: %s: (\"yes\" or \"no\") ",
		attnmessage);
	signal(SIGALRM, alarmcatch);
	alarm(120);
	timeout = 1;
}
/*
 *	Here if an inquisitive operator interrupts the dump program
 */
interrupt()
{
	msg("Interrupt received. Do >>>YOU<<< know what are you doing?\n");
	if (query("Do you really want to abort dump?"))
		dumpabort();
	signal(SIGINT, interrupt);
}

/*
 *	The following variables and routines manage alerting
 *	operators to the status of dump.
 *	This works much like wall(1) does.
 */
struct	Group *gp;

/*
 *	Get the names from the group entry "operator" to notify.
 */	
set_operators()
{
	if (!notify)		/*not going to notify*/
		return;
	gp = getgrnam(OPGRENT);
	endgrent();
	if (gp == (struct Group *)0){
		msg("No entry in /etc/group for %s.\n",
			OPGRENT);
		notify = 0;
		return;
	}
}

struct tm *localtime();
struct tm *localclock;

/*
 *	We fork a child to do the actual broadcasting, so
 *	that the process control groups are not messed up
 */
broadcast(message)
	char	*message;
{
	time_t		clock;
	FILE	*f_utmp;
	struct	utmp	utmp;
	char	**np;
	int	pid, s;

	switch (pid = fork()) {
	case -1:
		return;
	case 0:
		break;
	default:
		while (wait(&s) != pid)
			continue;
		return;
	}

	if (!notify || gp == 0)
		exit(0);
	clock = time((time_t *) 0);
	localclock = localtime(&clock);

	if((f_utmp = fopen("/etc/utmp", "r")) == NULL) {
		msg("Cannot open /etc/utmp\n");
		return;
	}

	while (!feof(f_utmp)){
		if (fread((char *) &utmp, sizeof (struct utmp), 1, f_utmp) != 1)
			break;
		if (utmp.ut_name[0] == 0)
			continue;
		for (np = gp->gr_mem; *np; np++){
			if (strncmp(*np, utmp.ut_name, sizeof(utmp.ut_name)) != 0)
				continue;
			/*
			 *	Do not send messages to operators on dialups
			 */
			if (strncmp(utmp.ut_line, DIALUP, strlen(DIALUP)) == 0)
				continue;
#ifdef DEBUG
			msg("Message to %s at %s\n",
				utmp.ut_name, utmp.ut_line);
#endif DEBUG
			sendmes(utmp.ut_line, message);
		}
	}
	fclose(f_utmp);
	Exit(0);	/* the wait in this same routine will catch this */
	/* NOTREACHED */
}

sendmes(tty, message)
char *tty, *message;
{
	char t[50], buf[BUFSIZ];
	register char *cp;
	register int c, ch;
	int	msize;
	FILE *f_tty;

	msize = strlen(message);
	strcpy(t, "/dev/");
	strcat(t, tty);

	if((f_tty = fopen(t, "w")) != NULL) {
		setbuf(f_tty, buf);
		fprintf(f_tty, "\nMessage from the dump program to all operators at %d:%02d ...\r\n\n"
		       ,localclock->tm_hour
		       ,localclock->tm_min);
		for (cp = message, c = msize; c-- > 0; cp++) {
			ch = *cp;
			if (ch == '\n')
				putc('\r', f_tty);
			putc(ch, f_tty);
		}
		fclose(f_tty);
	}
}

/*
 *	print out an estimate of the amount of time left to do the dump
 */

time_t	tschedule = 0;

timeest()
{
	time_t	tnow, deltat;

	time (&tnow);
	if (tnow >= tschedule){
		tschedule = tnow + 300;
		if (blockswritten < 500L)
			return;	
		deltat = tstart_writing - tnow +
			(time_t) (((1.0*(tnow - tstart_writing))/blockswritten) * esize);
		msg("%3.2f%% done, finished in %ld:%02ld\n",
			(double) ((((double) blockswritten)*100.0)/(double) esize),
			(deltat/3600L), (deltat%3600L)/60L);
	}
}

	/* VARARGS1 */
	/* ARGSUSED */
msg(fmt, a1, a2, a3, a4, a5)
	char	*fmt;
{
	fprintf(stderr,"  DUMP: ");
#ifdef TDEBUG
	fprintf(stderr,"pid=%d ", getpid());
#endif
	_doprnt (fmt, &a1, stderr);
	fflush(stdout);
	fflush(stderr);
}

	/* VARARGS1 */
	/* ARGSUSED */
msgtail(fmt, a1, a2, a3, a4, a5)
	char	*fmt;
{
	fprintf(stderr, fmt, a1, a2, a3, a4, a5);
}
/*
 *	Tell the operator what has to be done;
 *	we don't actually do it
 */

getfstab()
{
	register	struct	fstab	*dt;
			struct	fstab	*fsp;

	nfstab = 0;
	if (setfsent() == 0) {
		msg("Can't open %s for dump table information.\n", FSTAB);
	} else {
		for (nfstab = 0, dt = fstab; nfstab < MAXFSTAB;){
			if ( (fsp = getfsent()) == 0)
				break;
			if (   (strcmp(fsp->fs_type, FSTAB_RW) == 0)
			    || (strcmp(fsp->fs_type, FSTAB_RO) == 0) ){
				*dt = *fsp;
				nfstab++; 
				dt++;
			}
		}
		endfsent();
	}
}

/*
 *	Search in the fstab for a file name.
 *	This file name can be either the special or the path file name.
 *
 *	The entries in the fstab are the BLOCK special names, not the
 *	character special names.
 *	The caller of fstabsearch assures that the character device
 *	is dumped (that is much faster)
 *
 *	The file name can omit the leading '/'.
 */
struct	fstab	*fstabsearch(key)
	char	*key;
{
	register	struct	fstab *dt;
			int	i;
			int	keylength;
			char	*rawname();

	keylength = min(strlen(key) + 1, sizeof (dt->fs_file));
	for (i = 0, dt = fstab; i < nfstab; i++, dt++){
		if (strncmp(dt->fs_file, key, keylength) == 0)
			return(dt);
		if (strncmp(dt->fs_spec, key, keylength) == 0)
			return(dt);
		if (strncmp(rawname(dt->fs_spec), key, keylength) == 0)
			return(dt);

		if (key[0] != '/'){
			if (   (dt->fs_spec[0] == '/')
			    && (strncmp(dt->fs_spec+1, key, keylength) == 0))
				return(dt);
			if (   (dt->fs_file[0] == '/')
			    && (strncmp(dt->fs_file+1, key, keylength) == 0))
				return(dt);
		}
	}
	return(0);
}

/*
 *	Tell the operator what to do
 */
lastdump(arg)
	char	arg;		/* w ==> just what to do; W ==> most recent dumps */
{
			char	*lastname;
			char	*date;
	register	int	i;
			time_t	tnow;
	register	struct	fstab	*dt;
			int	dumpme;
	register	struct	idates	*itwalk;

	int	idatesort();

	time(&tnow);
	getfstab();		/* /etc/fstab input */
	inititimes();		/* /etc/dumpdates input */
	qsort(idatev, nidates, sizeof(struct idates *), idatesort);

	if (arg == 'w')
		fprintf(stdout, "Dump these file systems:\n");
	else
		fprintf(stdout, "Last dump(s) done (Dump '>' file systems):\n");
	lastname = "??";
	ITITERATE(i, itwalk){
		if (strncmp(lastname, itwalk->id_name, sizeof(itwalk->id_name)) == 0)
			continue;
		date = (char *)ctime(&itwalk->id_ddate);
		date[16] = '\0';		/* blast away seconds and year */
		lastname = itwalk->id_name;
		dt = fstabsearch(itwalk->id_name);
		dumpme = (  (dt != 0)
			 && (dt->fs_freq != 0)
			 && (itwalk->id_ddate < tnow - (dt->fs_freq*DAY)));
		if ( (arg != 'w') || dumpme)
		  fprintf(stdout,"%c %8s\t(%6s) Last dump: Level %c, Date %s\n",
			dumpme && (arg != 'w') ? '>' : ' ',
			itwalk->id_name,
			dt ? dt->fs_file : 0,
			itwalk->id_incno,
			date
		    );
	}
}

int	idatesort(p1, p2)
	struct	idates	**p1, **p2;
{
	int	diff;

	diff = strncmp((*p1)->id_name, (*p2)->id_name, sizeof((*p1)->id_name));
	if (diff == 0)
		/*
		 *	This won't work.  Must use the second form.
		return ((*p2)->id_ddate - (*p1)->id_ddate);
		*/
		if ((*p2)->id_ddate > (*p1)->id_ddate)
			return (1);
		else	if ((*p2)->id_ddate == (*p1)->id_ddate)
				return (0);
			else	return (-1);
	else
		return (diff);
}

int max(a,b)
{
	return(a>b?a:b);
}
int min(a,b)
{
	return(a<b?a:b);
}