Merge from vendor branch GROFF:
[dragonfly.git] / libexec / talkd / talkd.c
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1/*
2 * Copyright (c) 1983, 1993
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.
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32 *
33 * @(#) Copyright (c) 1983, 1993 The Regents of the University of California. All rights reserved.
34 * @(#)talkd.c 8.1 (Berkeley) 6/4/93
35 * $FreeBSD: src/libexec/talkd/talkd.c,v 1.11.2.1 2001/10/18 12:30:42 des Exp $
3eefb696 36 * $DragonFly: src/libexec/talkd/talkd.c,v 1.3 2003/11/14 03:54:31 dillon Exp $
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37 */
38
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39/*
40 * The top level of the daemon, the format is heavily borrowed
41 * from rwhod.c. Basically: find out who and where you are;
42 * disconnect all descriptors and ttys, and then endless
43 * loop on waiting for and processing requests
44 */
45#include <sys/types.h>
46#include <sys/socket.h>
47#include <sys/param.h>
48#include <protocols/talkd.h>
49#include <err.h>
50#include <errno.h>
51#include <paths.h>
52#include <signal.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <string.h>
56#include <syslog.h>
57#include <time.h>
58#include <unistd.h>
59
60CTL_MSG request;
61CTL_RESPONSE response;
62
63int sockt;
64int debug = 0;
65long lastmsgtime;
66
67char hostname[MAXHOSTNAMELEN];
68
69#define TIMEOUT 30
70#define MAXIDLE 120
71
3eefb696 72void process_request (CTL_MSG *, CTL_RESPONSE *);
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73void timeout();
74
75int
76main(argc, argv)
77 int argc;
78 char *argv[];
79{
80 register CTL_MSG *mp = &request;
81 int cc;
82
83#ifdef NOTDEF
84 /*
85 * removed so ntalkd can run in tty sandbox
86 */
87 if (getuid())
88 errx(1, "getuid: not super-user");
89#endif
90 openlog("talkd", LOG_PID, LOG_DAEMON);
91 if (gethostname(hostname, sizeof(hostname) - 1) < 0) {
92 syslog(LOG_ERR, "gethostname: %m");
93 _exit(1);
94 }
95 hostname[sizeof(hostname) - 1] = '\0';
96 if (chdir(_PATH_DEV) < 0) {
97 syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV);
98 _exit(1);
99 }
100 if (argc > 1 && strcmp(argv[1], "-d") == 0)
101 debug = 1;
102 signal(SIGALRM, timeout);
103 alarm(TIMEOUT);
104 for (;;) {
105 cc = recv(0, (char *)mp, sizeof (*mp), 0);
106 if (cc != sizeof (*mp)) {
107 if (cc < 0 && errno != EINTR)
108 syslog(LOG_WARNING, "recv: %m");
109 continue;
110 }
111 lastmsgtime = time(0);
112 process_request(mp, &response);
113 /* can block here, is this what I want? */
114 mp->ctl_addr.sa_family = htons(mp->ctl_addr.sa_family);
115 cc = sendto(sockt, (char *)&response,
116 sizeof (response), 0, (struct sockaddr *)&mp->ctl_addr,
117 sizeof (mp->ctl_addr));
118 if (cc != sizeof (response))
119 syslog(LOG_WARNING, "sendto: %m");
120 }
121}
122
123void
124timeout()
125{
126 int save_errno = errno;
127
128 if (time(0) - lastmsgtime >= MAXIDLE)
129 _exit(0);
130 alarm(TIMEOUT);
131 errno = save_errno;
132}