1 /* $NetBSD: startdaemon.c,v 1.15 2007/05/16 20:45:45 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
35 static char sccsid[] = "@(#)startdaemon.c 8.2 (Berkeley) 4/17/94";
36 #else
37 __RCSID("$NetBSD: startdaemon.c,v 1.15 2007/05/16 20:45:45 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
55 extern uid_t uid, euid;
56
57 /*
58 * Tell the printer daemon that there are new files in the spool directory.
59 */
60
61 int
startdaemon(const char * pname)62 startdaemon(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