Commit | Line | Data |
---|---|---|
cac73339 WJ |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
3 | * 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. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | char copyright[] = | |
36 | "@(#) Copyright (c) 1983 Regents of the University of California.\n\ | |
37 | All rights reserved.\n"; | |
38 | #endif /* not lint */ | |
39 | ||
40 | #ifndef lint | |
41 | static char sccsid[] = "@(#)talkd.c 5.8 (Berkeley) 2/26/91"; | |
42 | #endif /* not lint */ | |
43 | ||
44 | /* | |
45 | * The top level of the daemon, the format is heavily borrowed | |
46 | * from rwhod.c. Basically: find out who and where you are; | |
47 | * disconnect all descriptors and ttys, and then endless | |
48 | * loop on waiting for and processing requests | |
49 | */ | |
50 | #include <sys/types.h> | |
51 | #include <sys/socket.h> | |
52 | #include <protocols/talkd.h> | |
53 | #include <signal.h> | |
54 | #include <syslog.h> | |
55 | #include <time.h> | |
56 | #include <errno.h> | |
57 | #include <unistd.h> | |
58 | #include <stdio.h> | |
59 | #include <stdlib.h> | |
60 | #include <string.h> | |
61 | #include <paths.h> | |
62 | ||
63 | CTL_MSG request; | |
64 | CTL_RESPONSE response; | |
65 | ||
66 | int sockt; | |
67 | int debug = 0; | |
68 | void timeout(); | |
69 | long lastmsgtime; | |
70 | ||
71 | char hostname[32]; | |
72 | ||
73 | #define TIMEOUT 30 | |
74 | #define MAXIDLE 120 | |
75 | ||
76 | main(argc, argv) | |
77 | int argc; | |
78 | char *argv[]; | |
79 | { | |
80 | register CTL_MSG *mp = &request; | |
81 | int cc; | |
82 | ||
83 | if (getuid()) { | |
84 | fprintf(stderr, "%s: getuid: not super-user", argv[0]); | |
85 | exit(1); | |
86 | } | |
87 | openlog("talkd", LOG_PID, LOG_DAEMON); | |
88 | if (gethostname(hostname, sizeof (hostname) - 1) < 0) { | |
89 | syslog(LOG_ERR, "gethostname: %m"); | |
90 | _exit(1); | |
91 | } | |
92 | if (chdir(_PATH_DEV) < 0) { | |
93 | syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV); | |
94 | _exit(1); | |
95 | } | |
96 | if (argc > 1 && strcmp(argv[1], "-d") == 0) | |
97 | debug = 1; | |
98 | signal(SIGALRM, timeout); | |
99 | alarm(TIMEOUT); | |
100 | for (;;) { | |
101 | extern int errno; | |
102 | ||
103 | cc = recv(0, (char *)mp, sizeof (*mp), 0); | |
104 | if (cc != sizeof (*mp)) { | |
105 | if (cc < 0 && errno != EINTR) | |
106 | syslog(LOG_WARNING, "recv: %m"); | |
107 | continue; | |
108 | } | |
109 | lastmsgtime = time(0); | |
110 | process_request(mp, &response); | |
111 | /* can block here, is this what I want? */ | |
112 | cc = sendto(sockt, (char *)&response, | |
113 | sizeof (response), 0, (struct sockaddr *)&mp->ctl_addr, | |
114 | sizeof (mp->ctl_addr)); | |
115 | if (cc != sizeof (response)) | |
116 | syslog(LOG_WARNING, "sendto: %m"); | |
117 | } | |
118 | } | |
119 | ||
120 | void | |
121 | timeout() | |
122 | { | |
123 | ||
124 | if (time(0) - lastmsgtime >= MAXIDLE) | |
125 | _exit(0); | |
126 | alarm(TIMEOUT); | |
127 | } |