1/*	$NetBSD: startdaemon.c,v 1.14 2005/11/28 03:26:06 christos Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34#if 0
35static char sccsid[] = "@(#)startdaemon.c	8.2 (Berkeley) 4/17/94";
36#else
37__RCSID("$NetBSD: startdaemon.c,v 1.14 2005/11/28 03:26:06 christos Exp $");
38#endif
39#endif /* not lint */
40
41
42#include <sys/param.h>
43#include <sys/socket.h>
44#include <sys/un.h>
45
46#include <dirent.h>
47#include <errno.h>
48#include <stdio.h>
49#include <unistd.h>
50#include <string.h>
51#include <err.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(const char *pname)
63{
64	struct sockaddr_un un;
65	int s;
66	int n;
67	char buf[BUFSIZ];
68
69	s = socket(AF_LOCAL, 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_LOCAL;
76	strncpy(un.sun_path, _PATH_SOCKETNAME, sizeof(un.sun_path) - 1);
77#ifndef SUN_LEN
78#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
79#endif
80	seteuid(euid);
81	if (connect(s, (const struct sockaddr *)&un,
82	    (int)SUN_LEN(&un)) < 0) {
83		seteuid(uid);
84		warn("connect");
85		(void)close(s);
86		return(0);
87	}
88	seteuid(uid);
89	n = snprintf(buf, sizeof(buf), "\1%s\n", pname);
90	if (write(s, buf, n) != n) {
91		warn("write");
92		(void)close(s);
93		return(0);
94	}
95	if (read(s, buf, 1) == 1) {
96		if (buf[0] == '\0') {		/* everything is OK */
97			(void)close(s);
98			return(1);
99		}
100		putchar(buf[0]);
101	}
102	while ((n = read(s, buf, sizeof(buf))) > 0)
103		fwrite(buf, 1, n, stdout);
104	(void)close(s);
105	return(0);
106}
107