1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #ifndef lint
9 static char copyright[] =
10 "@(#) Copyright (c) 1983, 1993\n\
11 The Regents of the University of California. All rights reserved.\n";
12 #endif /* not lint */
13
14 #ifndef lint
15 static char sccsid[] = "@(#)talkd.c 8.1 (Berkeley) 06/04/93";
16 #endif /* not lint */
17
18 /*
19 * The top level of the daemon, the format is heavily borrowed
20 * from rwhod.c. Basically: find out who and where you are;
21 * disconnect all descriptors and ttys, and then endless
22 * loop on waiting for and processing requests
23 */
24 #include <sys/types.h>
25 #include <sys/socket.h>
26 #include <protocols/talkd.h>
27 #include <signal.h>
28 #include <syslog.h>
29 #include <time.h>
30 #include <errno.h>
31 #include <unistd.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <paths.h>
36
37 CTL_MSG request;
38 CTL_RESPONSE response;
39
40 int sockt;
41 int debug = 0;
42 void timeout();
43 long lastmsgtime;
44
45 char hostname[32];
46
47 #define TIMEOUT 30
48 #define MAXIDLE 120
49
main(argc,argv)50 main(argc, argv)
51 int argc;
52 char *argv[];
53 {
54 register CTL_MSG *mp = &request;
55 int cc;
56
57 if (getuid()) {
58 fprintf(stderr, "%s: getuid: not super-user\n", argv[0]);
59 exit(1);
60 }
61 openlog("talkd", LOG_PID, LOG_DAEMON);
62 if (gethostname(hostname, sizeof (hostname) - 1) < 0) {
63 syslog(LOG_ERR, "gethostname: %m");
64 _exit(1);
65 }
66 if (chdir(_PATH_DEV) < 0) {
67 syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV);
68 _exit(1);
69 }
70 if (argc > 1 && strcmp(argv[1], "-d") == 0)
71 debug = 1;
72 signal(SIGALRM, timeout);
73 alarm(TIMEOUT);
74 for (;;) {
75 extern int errno;
76
77 cc = recv(0, (char *)mp, sizeof (*mp), 0);
78 if (cc != sizeof (*mp)) {
79 if (cc < 0 && errno != EINTR)
80 syslog(LOG_WARNING, "recv: %m");
81 continue;
82 }
83 lastmsgtime = time(0);
84 process_request(mp, &response);
85 /* can block here, is this what I want? */
86 cc = sendto(sockt, (char *)&response,
87 sizeof (response), 0, (struct sockaddr *)&mp->ctl_addr,
88 sizeof (mp->ctl_addr));
89 if (cc != sizeof (response))
90 syslog(LOG_WARNING, "sendto: %m");
91 }
92 }
93
94 void
timeout()95 timeout()
96 {
97
98 if (time(0) - lastmsgtime >= MAXIDLE)
99 _exit(0);
100 alarm(TIMEOUT);
101 }
102