1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
/* $OpenBSD: talkd.c,v 1.2 1996/04/28 23:56:22 mickey Exp $ */
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
/*static char sccsid[] = "from: @(#)talkd.c 5.8 (Berkeley) 2/26/91";*/
static char rcsid[] = "$Id: talkd.c,v 1.2 1996/04/28 23:56:22 mickey Exp $";
#endif /* not lint */
/*
* The top level of the daemon, the format is heavily borrowed
* from rwhod.c. Basically: find out who and where you are;
* disconnect all descriptors and ttys, and then endless
* loop on waiting for and processing requests
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <protocols/talkd.h>
#include <signal.h>
#include <syslog.h>
#include <time.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <paths.h>
#include "talkd.h"
int sockt;
int debug = 0;
void timeout();
long lastmsgtime;
char hostname[32];
#define TIMEOUT 30
#define MAXIDLE 120
main(argc, argv)
int argc;
char *argv[];
{
if (getuid()) {
fprintf(stderr, "%s: getuid: not super-user", argv[0]);
exit(1);
}
openlog("talkd", LOG_PID, LOG_DAEMON);
if (gethostname(hostname, sizeof (hostname) - 1) < 0) {
syslog(LOG_ERR, "gethostname: %m");
_exit(1);
}
if (chdir(_PATH_DEV) < 0) {
syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV);
_exit(1);
}
if (argc > 1 && strcmp(argv[1], "-d") == 0)
debug = 1;
signal(SIGALRM, timeout);
alarm(TIMEOUT);
for (;;) {
CTL_MSG request;
CTL_RESPONSE response;
int cc;
int len = sizeof(response.addr);
cc = recvfrom(0, (char *)&request, sizeof (request), 0,
(struct sockaddr *)&response.addr, &len);
if (cc != sizeof (request)) {
if (cc < 0 && errno != EINTR)
syslog(LOG_WARNING, "recv: %m");
continue;
}
lastmsgtime = time(0);
process_request(&request, &response);
/* can block here, is this what I want? */
cc = sendto(sockt, (char *)&response,
sizeof (response), 0, (struct sockaddr *)&request.ctl_addr,
sizeof (request.ctl_addr));
if (cc != sizeof (response))
syslog(LOG_WARNING, "sendto: %m");
}
}
void
timeout()
{
if (time(0) - lastmsgtime >= MAXIDLE)
_exit(0);
alarm(TIMEOUT);
}
|
