Annotation of src/libexec/talkd/talkd.c, Revision 1.14
1.14 ! itojun 1: /* $NetBSD: talkd.c,v 1.13 2001/09/27 14:38:58 christos Exp $ */
1.5 christos 2:
1.1 cgd 3: /*
1.5 christos 4: * Copyright (c) 1983, 1993
5: * The Regents of the University of California. All rights reserved.
1.1 cgd 6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
1.5 christos 36: #include <sys/cdefs.h>
1.1 cgd 37: #ifndef lint
1.5 christos 38: __COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\
39: The Regents of the University of California. All rights reserved.\n");
1.1 cgd 40: #endif /* not lint */
41:
42: #ifndef lint
1.5 christos 43: #if 0
44: static char sccsid[] = "@(#)talkd.c 8.1 (Berkeley) 6/4/93";
45: #else
1.14 ! itojun 46: __RCSID("$NetBSD: talkd.c,v 1.13 2001/09/27 14:38:58 christos Exp $");
1.5 christos 47: #endif
1.1 cgd 48: #endif /* not lint */
49:
50: /*
51: * The top level of the daemon, the format is heavily borrowed
52: * from rwhod.c. Basically: find out who and where you are;
53: * disconnect all descriptors and ttys, and then endless
54: * loop on waiting for and processing requests
55: */
56: #include <sys/types.h>
57: #include <sys/socket.h>
1.4 explorer 58: #include <sys/param.h>
59:
1.1 cgd 60: #include <protocols/talkd.h>
1.8 mrg 61:
62: #include <errno.h>
63: #include <paths.h>
1.1 cgd 64: #include <signal.h>
1.8 mrg 65: #include <stdio.h>
66: #include <stdlib.h>
67: #include <string.h>
1.1 cgd 68: #include <syslog.h>
69: #include <time.h>
70: #include <unistd.h>
1.8 mrg 71:
1.6 christos 72: #include "extern.h"
1.1 cgd 73:
74: CTL_MSG request;
75: CTL_RESPONSE response;
76:
1.6 christos 77: int sockt = STDIN_FILENO;
1.1 cgd 78: int debug = 0;
1.9 mrg 79: int logging = 0;
1.1 cgd 80: long lastmsgtime;
81:
1.4 explorer 82: char hostname[MAXHOSTNAMELEN + 1];
1.1 cgd 83:
84: #define TIMEOUT 30
85: #define MAXIDLE 120
86:
1.6 christos 87: static void timeout __P((int));
88: int main __P((int, char *[]));
89:
90: int
1.1 cgd 91: main(argc, argv)
92: int argc;
93: char *argv[];
94: {
1.6 christos 95: CTL_MSG *mp = &request;
1.9 mrg 96: int cc, ch;
1.13 christos 97: struct sockaddr ctl_addr;
1.1 cgd 98:
99: openlog("talkd", LOG_PID, LOG_DAEMON);
1.9 mrg 100: while ((ch = getopt(argc, argv, "dl")) != -1)
101: switch (ch) {
102: case 'd':
103: debug = 1;
104: break;
105: case 'l':
106: logging = 1;
107: break;
108: default:
1.12 cgd 109: syslog(LOG_ERR, "Usage: %s [-dl]", getprogname());
1.9 mrg 110: exit(1);
111: }
112:
1.10 mrg 113: if (gethostname(hostname, sizeof hostname) < 0) {
1.1 cgd 114: syslog(LOG_ERR, "gethostname: %m");
115: _exit(1);
116: }
1.5 christos 117: hostname[MAXHOSTNAMELEN] = '\0'; /* ensure null termination */
1.1 cgd 118: if (chdir(_PATH_DEV) < 0) {
119: syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV);
120: _exit(1);
121: }
122: signal(SIGALRM, timeout);
123: alarm(TIMEOUT);
124: for (;;) {
1.14 ! itojun 125: memset(&response, 0, sizeof(response));
1.1 cgd 126: cc = recv(0, (char *)mp, sizeof (*mp), 0);
127: if (cc != sizeof (*mp)) {
128: if (cc < 0 && errno != EINTR)
129: syslog(LOG_WARNING, "recv: %m");
130: continue;
131: }
132: lastmsgtime = time(0);
133: process_request(mp, &response);
1.13 christos 134:
1.14 ! itojun 135: mp->l_name[sizeof(mp->l_name) - 1] = '\0';
! 136: mp->r_name[sizeof(mp->r_name) - 1] = '\0';
! 137: mp->r_tty[sizeof(mp->r_tty) - 1] = '\0';
! 138:
1.13 christos 139: (void)memcpy(&ctl_addr, &mp->ctl_addr, sizeof(ctl_addr));
140: ctl_addr.sa_family = mp->ctl_addr.sa_family;
141: ctl_addr.sa_len = sizeof(ctl_addr);
1.14 ! itojun 142: if (ctl_addr.sa_family != AF_INET)
! 143: continue;
1.13 christos 144:
1.1 cgd 145: /* can block here, is this what I want? */
1.13 christos 146: cc = sendto(sockt, (char *)&response, sizeof (response), 0,
147: &ctl_addr, sizeof (ctl_addr));
1.1 cgd 148: if (cc != sizeof (response))
149: syslog(LOG_WARNING, "sendto: %m");
150: }
151: }
152:
153: void
1.6 christos 154: timeout(n)
155: int n;
1.1 cgd 156: {
1.14 ! itojun 157: int save_errno = errno;
1.1 cgd 158:
159: if (time(0) - lastmsgtime >= MAXIDLE)
160: _exit(0);
161: alarm(TIMEOUT);
1.14 ! itojun 162: errno = save_errno;
1.1 cgd 163: }
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