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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)startdaemon.c 8.2 (Berkeley) 4/17/94
30 * $FreeBSD: src/usr.sbin/lpr/common_source/startdaemon.c,v 1.8.2.2 2002/04/26 18:24:40 gad Exp $
31 * $DragonFly: src/usr.sbin/lpr/common_source/startdaemon.c,v 1.4 2004/12/18 22:48:03 swildner Exp $
32 */
33
34 #include <sys/param.h>
35 #include <sys/socket.h>
36 #include <sys/uio.h>
37 #include <sys/un.h>
38
39 #include <dirent.h>
40 #include <err.h>
41 #include <stdio.h>
42 #include <string.h>
43 #include <unistd.h>
44 #include "lp.h"
45 #include "pathnames.h"
46
47 extern uid_t uid, euid;
48
49 /*
50 * Tell the printer daemon that there are new files in the spool directory.
51 */
52
53 int
startdaemon(const struct printer * pp)54 startdaemon(const struct printer *pp)
55 {
56 struct sockaddr_un un;
57 int s, n;
58 int connectres;
59 char c;
60
61 s = socket(PF_LOCAL, SOCK_STREAM, 0);
62 if (s < 0) {
63 warn("socket");
64 return(0);
65 }
66 memset(&un, 0, sizeof(un));
67 un.sun_family = AF_LOCAL;
68 strcpy(un.sun_path, _PATH_SOCKETNAME);
69 #ifndef SUN_LEN
70 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
71 #endif
72 seteuid(euid);
73 connectres = connect(s, (struct sockaddr *)&un, SUN_LEN(&un));
74 seteuid(uid);
75 if (connectres < 0) {
76 warn("Unable to connect to %s", _PATH_SOCKETNAME);
77 warnx("Check to see if the master 'lpd' process is running.");
78 close(s);
79 return(0);
80 }
81
82 /*
83 * Avoid overruns without putting artificial limitations on
84 * the length.
85 */
86 if (writel(s, "\1", pp->printer, "\n", NULL) <= 0) {
87 warn("write");
88 close(s);
89 return(0);
90 }
91 if (read(s, &c, 1) == 1) {
92 if (c == '\0') { /* everything is OK */
93 close(s);
94 return(1);
95 }
96 putchar(c);
97 }
98 while ((n = read(s, &c, 1)) > 0)
99 putchar(c);
100 close(s);
101 return(0);
102 }
103