xref: /freebsd/usr.sbin/lpr/common_source/startdaemon.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*
2  * Copyright (c) 1983, 1993, 1994
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 #if 0
35 #ifndef lint
36 static char sccsid[] = "@(#)startdaemon.c	8.2 (Berkeley) 4/17/94";
37 #endif /* not lint */
38 #endif
39 
40 #include "lp.cdefs.h"		/* A cross-platform version of <sys/cdefs.h> */
41 __FBSDID("$FreeBSD$");
42 
43 #include <sys/param.h>
44 #include <sys/socket.h>
45 #include <sys/uio.h>
46 #include <sys/un.h>
47 
48 #include <dirent.h>
49 #include <err.h>
50 #include <stdio.h>
51 #include <string.h>
52 #include <unistd.h>
53 #include "lp.h"
54 #include "pathnames.h"
55 
56 extern uid_t	uid, euid;
57 
58 /*
59  * Tell the printer daemon that there are new files in the spool directory.
60  */
61 
62 int
63 startdaemon(const struct printer *pp)
64 {
65 	struct sockaddr_un un;
66 	register int s, n;
67 	int connectres;
68 	char c;
69 
70 	s = socket(PF_LOCAL, SOCK_STREAM, 0);
71 	if (s < 0) {
72 		warn("socket");
73 		return(0);
74 	}
75 	memset(&un, 0, sizeof(un));
76 	un.sun_family = AF_LOCAL;
77 	strcpy(un.sun_path, _PATH_SOCKETNAME);
78 #ifndef SUN_LEN
79 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
80 #endif
81 	seteuid(euid);
82 	connectres = connect(s, (struct sockaddr *)&un, SUN_LEN(&un));
83 	seteuid(uid);
84 	if (connectres < 0) {
85 		warn("Unable to connect to %s", _PATH_SOCKETNAME);
86 		warnx("Check to see if the master 'lpd' process is running.");
87 		(void) close(s);
88 		return(0);
89 	}
90 
91 	/*
92 	 * Avoid overruns without putting artificial limitations on
93 	 * the length.
94 	 */
95 	if (writel(s, "\1", pp->printer, "\n", (char *)0) <= 0) {
96 		warn("write");
97 		(void) close(s);
98 		return(0);
99 	}
100 	if (read(s, &c, 1) == 1) {
101 		if (c == '\0') {		/* everything is OK */
102 			(void) close(s);
103 			return(1);
104 		}
105 		putchar(c);
106 	}
107 	while ((n = read(s, &c, 1)) > 0)
108 		putchar(c);
109 	(void) close(s);
110 	return(0);
111 }
112