[unix-history] / usr / src / usr.sbin / lpr / lpd / lpd.c

#ifndef lint
static char sccsid[] = "@(#)lpd.c	4.12 (Berkeley) %G%";
#endif

/*
 * lpd -- line printer daemon.
 *
 * Listen for a connection and perform the requested operation.
 * Operations are:
 *	\1printer\n
 *		check the queue for jobs and print any found.
 *	\2printer\n
 *		receive a job from another machine and queue it.
 *	\3printer [users ...] [jobs ...]\n
 *		return the current state of the queue (short form).
 *	\4printer [users ...] [jobs ...]\n
 *		return the current state of the queue (long form).
 *	\5printer person [users ...] [jobs ...]\n
 *		remove jobs from the queue.
 *
 * Strategy to maintain protected spooling area:
 *	1. Spooling area is writable only by daemon and spooling group
 *	2. lpr runs setuid root and setgrp spooling group; it uses
 *	   root to access any file it wants (verifying things before
 *	   with an access call) and group id to know how it should
 *	   set up ownership of files in the spooling area.
 *	3. Files in spooling area are owned by root, group spooling
 *	   group, with mode 660.
 *	4. lpd, lpq and lprm run setuid daemon and setgrp spooling group to
 *	   access files and printer.  Users can't get to anything
 *	   w/o help of lpq and lprm programs.
 */

#include "lp.h"

int	lflag;				/* log requests flag */

int	reapchild();
int	mcleanup();

main(argc, argv)
	int argc;
	char **argv;
{
	int f, funix, finet, options, defreadfds, fromlen;
	struct sockaddr_un sun, fromunix;
	struct sockaddr_in sin, frominet;
	int omask, lfd;

	gethostname(host, sizeof(host));
	name = argv[0];

	while (--argc > 0) {
		argv++;
		if (argv[0][0] == '-')
			switch (argv[0][1]) {
			case 'd':
				options |= SO_DEBUG;
				break;
			case 'l':
				lflag++;
				break;
			}
	}

#ifndef DEBUG
	/*
	 * Set up standard environment by detaching from the parent.
	 */
	if (fork())
		exit(0);
	for (f = 0; f < 5; f++)
		(void) close(f);
	(void) open("/dev/null", O_RDONLY);
	(void) open("/dev/null", O_WRONLY);
	(void) dup(1);
	f = open("/dev/tty", O_RDWR);
	if (f > 0) {
		ioctl(f, TIOCNOTTY, 0);
		(void) close(f);
	}
#endif

	openlog("lpd", LOG_PID, 0);
	(void) umask(0);
	lfd = open(MASTERLOCK, O_WRONLY|O_CREAT, 0644);
	if (lfd < 0) {
		syslog(LOG_ERR, "%s: %m", MASTERLOCK);
		exit(1);
	}
	if (flock(lfd, LOCK_EX|LOCK_NB) < 0) {
		if (errno == EWOULDBLOCK)	/* active deamon present */
			exit(0);
		syslog(LOG_ERR, "%s: %m", MASTERLOCK);
		exit(1);
	}
	ftruncate(lfd, 0);
	/*
	 * write process id for others to know
	 */
	sprintf(line, "%u\n", getpid());
	f = strlen(line);
	if (write(lfd, line, f) != f) {
		syslog(LOG_ERR, "%s: %m", MASTERLOCK);
		exit(1);
	}
	signal(SIGCHLD, reapchild);
	/*
	 * Restart all the printers.
	 */
	startup();
	(void) unlink(SOCKETNAME);
	funix = socket(AF_UNIX, SOCK_STREAM, 0);
	if (funix < 0) {
		syslog(LOG_ERR, "socket: %m");
		exit(1);
	}
#define	mask(s)	(1 << ((s) - 1))
	omask = sigblock(mask(SIGHUP)|mask(SIGINT)|mask(SIGQUIT)|mask(SIGTERM));
	signal(SIGHUP, mcleanup);
	signal(SIGINT, mcleanup);
	signal(SIGQUIT, mcleanup);
	signal(SIGTERM, mcleanup);
	sun.sun_family = AF_UNIX;
	strcpy(sun.sun_path, SOCKETNAME);
	if (bind(funix, &sun, strlen(sun.sun_path) + 2) < 0) {
		syslog(LOG_ERR, "ubind: %m");
		exit(1);
	}
	sigsetmask(omask);
	defreadfds = 1 << funix;
	listen(funix, 5);
	finet = socket(AF_INET, SOCK_STREAM, 0);
	if (finet >= 0) {
		struct servent *sp;

		if (options & SO_DEBUG)
			if (setsockopt(finet, SOL_SOCKET, SO_DEBUG, 0, 0) < 0) {
				syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
				mcleanup();
			}
		sp = getservbyname("printer", "tcp");
		if (sp == NULL) {
			syslog(LOG_ERR, "printer/tcp: unknown service");
			mcleanup();
		}
		sin.sin_family = AF_INET;
		sin.sin_port = sp->s_port;
		if (bind(finet, &sin, sizeof(sin), 0) < 0) {
			syslog(LOG_ERR, "bind: %m");
			mcleanup();
		}
		defreadfds |= 1 << finet;
		listen(finet, 5);
	}
	/*
	 * Main loop: accept, do a request, continue.
	 */
	for (;;) {
		int domain, nfds, s, readfds = defreadfds;

		nfds = select(20, &readfds, 0, 0, 0);
		if (nfds <= 0) {
			if (nfds < 0 && errno != EINTR)
				syslog(LOG_WARNING, "select: %m");
			continue;
		}
		if (readfds & (1 << funix)) {
			domain = AF_UNIX, fromlen = sizeof(fromunix);
			s = accept(funix, &fromunix, &fromlen);
		} else if (readfds & (1 << finet)) {
			domain = AF_INET, fromlen = sizeof(frominet);
			s = accept(finet, &frominet, &fromlen);
		}
		if (s < 0) {
			if (errno != EINTR)
				syslog(LOG_WARNING, "accept: %m");
			continue;
		}
		if (fork() == 0) {
			signal(SIGCHLD, SIG_IGN);
			signal(SIGHUP, SIG_IGN);
			signal(SIGINT, SIG_IGN);
			signal(SIGQUIT, SIG_IGN);
			signal(SIGTERM, SIG_IGN);
			(void) close(funix);
			(void) close(finet);
			dup2(s, 1);
			(void) close(s);
			if (domain == AF_INET)
				chkhost(&frominet);
			doit();
			exit(0);
		}
		(void) close(s);
	}
}

reapchild()
{
	union wait status;

	while (wait3(&status, WNOHANG, 0) > 0)
		;
}

mcleanup()
{
	if (lflag)
		syslog(LOG_INFO, "exiting");
	unlink(SOCKETNAME);
	exit(0);
}

/*
 * Stuff for handling job specifications
 */
char	*user[MAXUSERS];	/* users to process */
int	users;			/* # of users in user array */
int	requ[MAXREQUESTS];	/* job number of spool entries */
int	requests;		/* # of spool requests */
char	*person;		/* name of person doing lprm */

char	fromb[32];	/* buffer for client's machine name */
char	cbuf[BUFSIZ];	/* command line buffer */
char	*cmdnames[] = {
	"null",
	"printjob",
	"recvjob",
	"displayq short",
	"displayq long",
	"rmjob"
};

doit()
{
	register char *cp;
	register int n;

	for (;;) {
		cp = cbuf;
		do {
			if (cp >= &cbuf[sizeof(cbuf) - 1])
				fatal("Command line too long");
			if ((n = read(1, cp, 1)) != 1) {
				if (n < 0)
					fatal("Lost connection");
				return;
			}
		} while (*cp++ != '\n');
		*--cp = '\0';
		cp = cbuf;
		if (lflag) {
			if (*cp >= '\1' && *cp <= '\5')
				syslog(LOG_INFO, "%s requests %s %s",
					from, cmdnames[*cp], cp+1);
			else
				syslog(LOG_INFO, "bad request (%d) from %s",
					*cp, from);
		}
		switch (*cp++) {
		case '\1':	/* check the queue and print any jobs there */
			printer = cp;
			printjob();
			break;
		case '\2':	/* receive files to be queued */
			printer = cp;
			recvjob();
			break;
		case '\3':	/* display the queue (short form) */
		case '\4':	/* display the queue (long form) */
			printer = cp;
			while (*cp) {
				if (*cp != ' ') {
					cp++;
					continue;
				}
				*cp++ = '\0';
				while (isspace(*cp))
					cp++;
				if (*cp == '\0')
					break;
				if (isdigit(*cp)) {
					if (requests >= MAXREQUESTS)
						fatal("Too many requests");
					requ[requests++] = atoi(cp);
				} else {
					if (users >= MAXUSERS)
						fatal("Too many users");
					user[users++] = cp;
				}
			}
			displayq(cbuf[0] - '\3');
			exit(0);
		case '\5':	/* remove a job from the queue */
			printer = cp;
			while (*cp && *cp != ' ')
				cp++;
			if (!*cp)
				break;
			*cp++ = '\0';
			person = cp;
			while (*cp) {
				if (*cp != ' ') {
					cp++;
					continue;
				}
				*cp++ = '\0';
				while (isspace(*cp))
					cp++;
				if (*cp == '\0')
					break;
				if (isdigit(*cp)) {
					if (requests >= MAXREQUESTS)
						fatal("Too many requests");
					requ[requests++] = atoi(cp);
				} else {
					if (users >= MAXUSERS)
						fatal("Too many users");
					user[users++] = cp;
				}
			}
			rmjob();
			break;
		}
		fatal("Illegal service request");
	}
}

/*
 * Make a pass through the printcap database and start printing any
 * files left from the last time the machine went down.
 */
startup()
{
	char buf[BUFSIZ];
	register char *cp;
	int pid;

	printer = buf;

	/*
	 * Restart the daemons.
	 */
	while (getprent(buf) > 0) {
		for (cp = buf; *cp; cp++)
			if (*cp == '|' || *cp == ':') {
				*cp = '\0';
				break;
			}
		if ((pid = fork()) < 0) {
			syslog(LOG_WARNING, "startup: cannot fork");
			mcleanup();
		}
		if (!pid) {
			endprent();
			printjob();
		}
	}
}

/*
 * Check to see if the from host has access to the line printer.
 */
chkhost(f)
	struct sockaddr_in *f;
{
	register struct hostent *hp;
	register FILE *hostf;
	register char *cp;
	char ahost[50];
	int first = 1;
	extern char *inet_ntoa();

	f->sin_port = ntohs(f->sin_port);
	if (f->sin_family != AF_INET || f->sin_port >= IPPORT_RESERVED)
		fatal("Malformed from address");
	hp = gethostbyaddr(&f->sin_addr, sizeof(struct in_addr), f->sin_family);
	if (hp == 0)
		fatal("Host name for your address (%s) unknown",
			inet_ntoa(f->sin_addr));

	strcpy(fromb, hp->h_name);
	from = fromb;
	if (!strcmp(from, host))
		return;

	hostf = fopen("/etc/hosts.equiv", "r");
again:
	if (hostf) {
		while (fgets(ahost, sizeof (ahost), hostf)) {
			if (cp = index(ahost, '\n'))
				*cp = '\0';
			cp = index(ahost, ' ');
			if (!strcmp(from, ahost) && cp == NULL) {
				(void) fclose(hostf);
				return;
			}
		}
		(void) fclose(hostf);
	}
	if (first == 1) {
		first = 0;
		hostf = fopen("/etc/hosts.lpd", "r");
		goto again;
	}
	fatal("Your host does not have line printer access");
}
Commit	Line	Data
3a7f30af	1	#ifndef lint
82bca8f8	2	static char sccsid[] = "@(#)lpd.c 4.12 (Berkeley) %G%";
3a7f30af SL	3	#endif
3a7f30af SL	4
7245937a RC	5	/*
	6	* lpd -- line printer daemon.
	7	*
	8	* Listen for a connection and perform the requested operation.
	9	* Operations are:
	10	* \1printer\n
	11	* check the queue for jobs and print any found.
	12	* \2printer\n
	13	* receive a job from another machine and queue it.
	14	* \3printer [users ...] [jobs ...]\n
	15	* return the current state of the queue (short form).
	16	* \4printer [users ...] [jobs ...]\n
	17	* return the current state of the queue (long form).
	18	* \5printer person [users ...] [jobs ...]\n
	19	* remove jobs from the queue.
	20	*
	21	* Strategy to maintain protected spooling area:
	22	* 1. Spooling area is writable only by daemon and spooling group
	23	* 2. lpr runs setuid root and setgrp spooling group; it uses
	24	* root to access any file it wants (verifying things before
	25	* with an access call) and group id to know how it should
	26	* set up ownership of files in the spooling area.
4d4caa50	27	* 3. Files in spooling area are owned by root, group spooling
7245937a RC	28	* group, with mode 660.
	29	* 4. lpd, lpq and lprm run setuid daemon and setgrp spooling group to
	30	* access files and printer. Users can't get to anything
	31	* w/o help of lpq and lprm programs.
	32	*/
	33
	34	#include "lp.h"
	35
82bca8f8	36	int lflag; /* log requests flag */
54266d1f	37
7245937a	38	int reapchild();
82bca8f8	39	int mcleanup();
7245937a RC	40
	41	main(argc, argv)
	42	int argc;
	43	char **argv;
	44	{
8c4b7b45 SL	45	int f, funix, finet, options, defreadfds, fromlen;
	46	struct sockaddr_un sun, fromunix;
	47	struct sockaddr_in sin, frominet;
c0297f12	48	int omask, lfd;
7245937a RC	49
	50	gethostname(host, sizeof(host));
	51	name = argv[0];
	52
7245937a RC	53	while (--argc > 0) {
	54	argv++;
	55	if (argv[0][0] == '-')
	56	switch (argv[0][1]) {
	57	case 'd':
	58	options \|= SO_DEBUG;
	59	break;
	60	case 'l':
4d4caa50 RC	61	lflag++;
4d4caa50 RC	62	break;
7245937a	63	}
7245937a	64	}
c0297f12	65
7245937a RC	66	#ifndef DEBUG
	67	/*
	68	* Set up standard environment by detaching from the parent.
	69	*/
	70	if (fork())
	71	exit(0);
82bca8f8	72	for (f = 0; f < 5; f++)
7245937a	73	(void) close(f);
adec4d9e SL	74	(void) open("/dev/null", O_RDONLY);
adec4d9e SL	75	(void) open("/dev/null", O_WRONLY);
82bca8f8	76	(void) dup(1);
adec4d9e	77	f = open("/dev/tty", O_RDWR);
7245937a RC	78	if (f > 0) {
	79	ioctl(f, TIOCNOTTY, 0);
	80	(void) close(f);
	81	}
	82	#endif
c0297f12	83
82bca8f8	84	openlog("lpd", LOG_PID, 0);
7245937a	85	(void) umask(0);
c0297f12 RC	86	lfd = open(MASTERLOCK, O_WRONLY\|O_CREAT, 0644);
c0297f12 RC	87	if (lfd < 0) {
82bca8f8	88	syslog(LOG_ERR, "%s: %m", MASTERLOCK);
c0297f12 RC	89	exit(1);
	90	}
	91	if (flock(lfd, LOCK_EX\|LOCK_NB) < 0) {
	92	if (errno == EWOULDBLOCK) /* active deamon present */
	93	exit(0);
82bca8f8	94	syslog(LOG_ERR, "%s: %m", MASTERLOCK);
c0297f12 RC	95	exit(1);
	96	}
	97	ftruncate(lfd, 0);
	98	/*
	99	* write process id for others to know
	100	*/
	101	sprintf(line, "%u\n", getpid());
	102	f = strlen(line);
	103	if (write(lfd, line, f) != f) {
82bca8f8	104	syslog(LOG_ERR, "%s: %m", MASTERLOCK);
c0297f12 RC	105	exit(1);
	106	}
	107	signal(SIGCHLD, reapchild);
54266d1f RC	108	/*
	109	* Restart all the printers.
	110	*/
	111	startup();
c0297f12	112	(void) unlink(SOCKETNAME);
8c4b7b45 SL	113	funix = socket(AF_UNIX, SOCK_STREAM, 0);
8c4b7b45 SL	114	if (funix < 0) {
82bca8f8	115	syslog(LOG_ERR, "socket: %m");
7245937a RC	116	exit(1);
7245937a RC	117	}
845f1693 RC	118	#define mask(s) (1 << ((s) - 1))
845f1693 RC	119	omask = sigblock(mask(SIGHUP)\|mask(SIGINT)\|mask(SIGQUIT)\|mask(SIGTERM));
82bca8f8 RC	120	signal(SIGHUP, mcleanup);
	121	signal(SIGINT, mcleanup);
	122	signal(SIGQUIT, mcleanup);
	123	signal(SIGTERM, mcleanup);
8c4b7b45 SL	124	sun.sun_family = AF_UNIX;
	125	strcpy(sun.sun_path, SOCKETNAME);
	126	if (bind(funix, &sun, strlen(sun.sun_path) + 2) < 0) {
82bca8f8	127	syslog(LOG_ERR, "ubind: %m");
7245937a RC	128	exit(1);
7245937a RC	129	}
8c4b7b45	130	sigsetmask(omask);
845f1693 RC	131	defreadfds = 1 << funix;
845f1693 RC	132	listen(funix, 5);
8c4b7b45 SL	133	finet = socket(AF_INET, SOCK_STREAM, 0);
	134	if (finet >= 0) {
	135	struct servent *sp;
	136
	137	if (options & SO_DEBUG)
	138	if (setsockopt(finet, SOL_SOCKET, SO_DEBUG, 0, 0) < 0) {
82bca8f8 RC	139	syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
82bca8f8 RC	140	mcleanup();
8c4b7b45 SL	141	}
	142	sp = getservbyname("printer", "tcp");
	143	if (sp == NULL) {
82bca8f8 RC	144	syslog(LOG_ERR, "printer/tcp: unknown service");
82bca8f8 RC	145	mcleanup();
8c4b7b45 SL	146	}
	147	sin.sin_family = AF_INET;
	148	sin.sin_port = sp->s_port;
	149	if (bind(finet, &sin, sizeof(sin), 0) < 0) {
82bca8f8 RC	150	syslog(LOG_ERR, "bind: %m");
82bca8f8 RC	151	mcleanup();
8c4b7b45	152	}
8c4b7b45 SL	153	defreadfds \|= 1 << finet;
	154	listen(finet, 5);
	155	}
845f1693 RC	156	/*
	157	* Main loop: accept, do a request, continue.
	158	*/
7245937a	159	for (;;) {
3a7f30af	160	int domain, nfds, s, readfds = defreadfds;
7245937a	161
3a7f30af SL	162	nfds = select(20, &readfds, 0, 0, 0);
3a7f30af SL	163	if (nfds <= 0) {
82bca8f8 RC	164	if (nfds < 0 && errno != EINTR)
82bca8f8 RC	165	syslog(LOG_WARNING, "select: %m");
3a7f30af SL	166	continue;
3a7f30af SL	167	}
8c4b7b45	168	if (readfds & (1 << funix)) {
3a7f30af	169	domain = AF_UNIX, fromlen = sizeof(fromunix);
8c4b7b45	170	s = accept(funix, &fromunix, &fromlen);
3a7f30af SL	171	} else if (readfds & (1 << finet)) {
3a7f30af SL	172	domain = AF_INET, fromlen = sizeof(frominet);
8c4b7b45 SL	173	s = accept(finet, &frominet, &fromlen);
8c4b7b45 SL	174	}
7245937a	175	if (s < 0) {
82bca8f8 RC	176	if (errno != EINTR)
	177	syslog(LOG_WARNING, "accept: %m");
	178	continue;
7245937a RC	179	}
7245937a RC	180	if (fork() == 0) {
adec4d9e	181	signal(SIGCHLD, SIG_IGN);
f0b73bd5 RC	182	signal(SIGHUP, SIG_IGN);
	183	signal(SIGINT, SIG_IGN);
	184	signal(SIGQUIT, SIG_IGN);
	185	signal(SIGTERM, SIG_IGN);
8c4b7b45 SL	186	(void) close(funix);
	187	(void) close(finet);
	188	dup2(s, 1);
	189	(void) close(s);
	190	if (domain == AF_INET)
	191	chkhost(&frominet);
	192	doit();
7245937a RC	193	exit(0);
	194	}
	195	(void) close(s);
	196	}
	197	}
	198
	199	reapchild()
	200	{
	201	union wait status;
	202
	203	while (wait3(&status, WNOHANG, 0) > 0)
	204	;
	205	}
	206
82bca8f8	207	mcleanup()
8c4b7b45	208	{
845f1693	209	if (lflag)
82bca8f8	210	syslog(LOG_INFO, "exiting");
8c4b7b45 SL	211	unlink(SOCKETNAME);
	212	exit(0);
	213	}
	214
7245937a RC	215	/*
	216	* Stuff for handling job specifications
	217	*/
	218	char user[MAXUSERS]; / users to process */
	219	int users; /* # of users in user array */
	220	int requ[MAXREQUESTS]; /* job number of spool entries */
	221	int requests; /* # of spool requests */
54266d1f	222	char person; / name of person doing lprm */
7245937a	223
82bca8f8 RC	224	char fromb[32]; /* buffer for client's machine name */
	225	char cbuf[BUFSIZ]; /* command line buffer */
	226	char *cmdnames[] = {
4d4caa50 RC	227	"null",
	228	"printjob",
	229	"recvjob",
	230	"displayq short",
	231	"displayq long",
	232	"rmjob"
	233	};
7245937a	234
8c4b7b45	235	doit()
7245937a RC	236	{
7245937a RC	237	register char *cp;
7245937a	238	register int n;
7245937a	239
7245937a RC	240	for (;;) {
	241	cp = cbuf;
	242	do {
8c4b7b45 SL	243	if (cp >= &cbuf[sizeof(cbuf) - 1])
	244	fatal("Command line too long");
	245	if ((n = read(1, cp, 1)) != 1) {
7245937a RC	246	if (n < 0)
	247	fatal("Lost connection");
	248	return;
	249	}
8c4b7b45	250	} while (*cp++ != '\n');
7245937a RC	251	*--cp = '\0';
7245937a RC	252	cp = cbuf;
82bca8f8 RC	253	if (lflag) {
	254	if (cp >= '\1' && cp <= '\5')
	255	syslog(LOG_INFO, "%s requests %s %s",
	256	from, cmdnames[*cp], cp+1);
	257	else
	258	syslog(LOG_INFO, "bad request (%d) from %s",
	259	*cp, from);
4d4caa50	260	}
7245937a RC	261	switch (*cp++) {
	262	case '\1': /* check the queue and print any jobs there */
	263	printer = cp;
	264	printjob();
	265	break;
	266	case '\2': /* receive files to be queued */
	267	printer = cp;
	268	recvjob();
	269	break;
4d4caa50 RC	270	case '\3': /* display the queue (short form) */
4d4caa50 RC	271	case '\4': /* display the queue (long form) */
7245937a RC	272	printer = cp;
	273	while (*cp) {
	274	if (*cp != ' ') {
	275	cp++;
	276	continue;
	277	}
	278	*cp++ = '\0';
	279	while (isspace(*cp))
	280	cp++;
	281	if (*cp == '\0')
	282	break;
	283	if (isdigit(*cp)) {
	284	if (requests >= MAXREQUESTS)
	285	fatal("Too many requests");
	286	requ[requests++] = atoi(cp);
	287	} else {
	288	if (users >= MAXUSERS)
	289	fatal("Too many users");
	290	user[users++] = cp;
	291	}
	292	}
	293	displayq(cbuf[0] - '\3');
	294	exit(0);
	295	case '\5': /* remove a job from the queue */
	296	printer = cp;
	297	while (cp && cp != ' ')
	298	cp++;
	299	if (!*cp)
	300	break;
	301	*cp++ = '\0';
	302	person = cp;
	303	while (*cp) {
	304	if (*cp != ' ') {
	305	cp++;
	306	continue;
	307	}
	308	*cp++ = '\0';
	309	while (isspace(*cp))
	310	cp++;
	311	if (*cp == '\0')
	312	break;
	313	if (isdigit(*cp)) {
	314	if (requests >= MAXREQUESTS)
	315	fatal("Too many requests");
	316	requ[requests++] = atoi(cp);
	317	} else {
	318	if (users >= MAXUSERS)
	319	fatal("Too many users");
	320	user[users++] = cp;
	321	}
	322	}
	323	rmjob();
	324	break;
	325	}
	326	fatal("Illegal service request");
7245937a RC	327	}
	328	}
	329
4d4caa50 RC	330	/*
	331	* Make a pass through the printcap database and start printing any
	332	* files left from the last time the machine went down.
	333	*/
	334	startup()
	335	{
	336	char buf[BUFSIZ];
	337	register char *cp;
	338	int pid;
	339
	340	printer = buf;
	341
	342	/*
	343	* Restart the daemons.
	344	*/
	345	while (getprent(buf) > 0) {
	346	for (cp = buf; *cp; cp++)
	347	if (cp == '\|' \|\| cp == ':') {
	348	*cp = '\0';
	349	break;
	350	}
	351	if ((pid = fork()) < 0) {
82bca8f8 RC	352	syslog(LOG_WARNING, "startup: cannot fork");
82bca8f8 RC	353	mcleanup();
4d4caa50 RC	354	}
	355	if (!pid) {
	356	endprent();
	357	printjob();
	358	}
	359	}
	360	}
	361
	362	/*
	363	* Check to see if the from host has access to the line printer.
	364	*/
8c4b7b45 SL	365	chkhost(f)
8c4b7b45 SL	366	struct sockaddr_in *f;
4d4caa50	367	{
8c4b7b45	368	register struct hostent *hp;
4d4caa50 RC	369	register FILE *hostf;
	370	register char *cp;
	371	char ahost[50];
24c04811	372	int first = 1;
8c4b7b45	373	extern char *inet_ntoa();
4d4caa50	374
8c4b7b45 SL	375	f->sin_port = ntohs(f->sin_port);
	376	if (f->sin_family != AF_INET \|\| f->sin_port >= IPPORT_RESERVED)
	377	fatal("Malformed from address");
	378	hp = gethostbyaddr(&f->sin_addr, sizeof(struct in_addr), f->sin_family);
	379	if (hp == 0)
	380	fatal("Host name for your address (%s) unknown",
	381	inet_ntoa(f->sin_addr));
	382
	383	strcpy(fromb, hp->h_name);
	384	from = fromb;
219e8551	385	if (!strcmp(from, host))
8c4b7b45	386	return;
219e8551	387
4d4caa50	388	hostf = fopen("/etc/hosts.equiv", "r");
24c04811 RC	389	again:
	390	if (hostf) {
	391	while (fgets(ahost, sizeof (ahost), hostf)) {
	392	if (cp = index(ahost, '\n'))
	393	*cp = '\0';
	394	cp = index(ahost, ' ');
	395	if (!strcmp(from, ahost) && cp == NULL) {
	396	(void) fclose(hostf);
	397	return;
	398	}
4d4caa50	399	}
24c04811 RC	400	(void) fclose(hostf);
	401	}
	402	if (first == 1) {
	403	first = 0;
	404	hostf = fopen("/etc/hosts.lpd", "r");
	405	goto again;
4d4caa50	406	}
8c4b7b45	407	fatal("Your host does not have line printer access");
4d4caa50	408	}