startdaemon.c revision 29780 
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#ifndef lint
35#if 0
36static char sccsid[] = "@(#)startdaemon.c	8.2 (Berkeley) 4/17/94";
37#endif
38static const char rcsid[] =
39	"$Id$";
40#endif /* not lint */
41
42
43#include <sys/param.h>
44#include <sys/socket.h>
45#include <sys/un.h>
46
47#include <dirent.h>
48#include <err.h>
49#include <stdio.h>
50#include <string.h>
51#include <unistd.h>
52#include "lp.h"
53#include "pathnames.h"
54
55extern uid_t	uid, euid;
56
57/*
58 * Tell the printer daemon that there are new files in the spool directory.
59 */
60
61int
62startdaemon(printer)
63	char *printer;
64{
65	struct sockaddr_un un;
66	register int s, n;
67	char buf[BUFSIZ];
68
69	s = socket(AF_UNIX, SOCK_STREAM, 0);
70	if (s < 0) {
71		warn("socket");
72		return(0);
73	}
74	memset(&un, 0, sizeof(un));
75	un.sun_family = AF_UNIX;
76	strcpy(un.sun_path, _PATH_SOCKETNAME);
77#ifndef SUN_LEN
78#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
79#endif
80	seteuid(euid);
81	if (connect(s, (struct sockaddr *)&un, SUN_LEN(&un)) < 0) {
82		seteuid(uid);
83		warn("connect");
84		(void) close(s);
85		return(0);
86	}
87	seteuid(uid);
88	if (snprintf(buf, sizeof(buf), "\1%s\n", printer) > sizeof(buf) - 1) {
89		close(s);
90		return (0);
91	}
92	n = strlen(buf);
93	if (write(s, buf, n) != n) {
94		warn("write");
95		(void) close(s);
96		return(0);
97	}
98	if (read(s, buf, 1) == 1) {
99		if (buf[0] == '\0') {		/* everything is OK */
100			(void) close(s);
101			return(1);
102		}
103		putchar(buf[0]);
104	}
105	while ((n = read(s, buf, sizeof(buf))) > 0)
106		fwrite(buf, 1, n, stdout);
107	(void) close(s);
108	return(0);
109}
110