Annotation of src/libexec/talkd/talkd.c, Revision 1.20.6.1
1.20.6.1! jym 1: /* $NetBSD: talkd.c,v 1.21 2009/03/16 01:04:32 lukem 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.
1.17 agc 15: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
31:
1.5 christos 32: #include <sys/cdefs.h>
1.1 cgd 33: #ifndef lint
1.20 lukem 34: __COPYRIGHT("@(#) Copyright (c) 1983, 1993\
35: The Regents of the University of California. All rights reserved.");
1.1 cgd 36: #endif /* not lint */
37:
38: #ifndef lint
1.5 christos 39: #if 0
40: static char sccsid[] = "@(#)talkd.c 8.1 (Berkeley) 6/4/93";
41: #else
1.20.6.1! jym 42: __RCSID("$NetBSD: talkd.c,v 1.21 2009/03/16 01:04:32 lukem Exp $");
1.5 christos 43: #endif
1.1 cgd 44: #endif /* not lint */
45:
46: /*
47: * The top level of the daemon, the format is heavily borrowed
48: * from rwhod.c. Basically: find out who and where you are;
49: * disconnect all descriptors and ttys, and then endless
50: * loop on waiting for and processing requests
51: */
52: #include <sys/types.h>
53: #include <sys/socket.h>
1.4 explorer 54: #include <sys/param.h>
55:
1.1 cgd 56: #include <protocols/talkd.h>
1.8 mrg 57:
58: #include <errno.h>
59: #include <paths.h>
1.1 cgd 60: #include <signal.h>
1.8 mrg 61: #include <stdio.h>
62: #include <stdlib.h>
63: #include <string.h>
1.1 cgd 64: #include <syslog.h>
65: #include <time.h>
66: #include <unistd.h>
1.8 mrg 67:
1.6 christos 68: #include "extern.h"
1.1 cgd 69:
70: CTL_MSG request;
71: CTL_RESPONSE response;
72:
1.6 christos 73: int sockt = STDIN_FILENO;
1.1 cgd 74: int debug = 0;
1.9 mrg 75: int logging = 0;
1.19 dholland 76: time_t lastmsgtime;
1.1 cgd 77:
1.4 explorer 78: char hostname[MAXHOSTNAMELEN + 1];
1.1 cgd 79:
80: #define TIMEOUT 30
81: #define MAXIDLE 120
82:
1.20.6.1! jym 83: static void timeout(int);
! 84: int main(int, char *[]);
1.6 christos 85:
86: int
1.20.6.1! jym 87: main(int argc, char *argv[])
1.1 cgd 88: {
1.6 christos 89: CTL_MSG *mp = &request;
1.9 mrg 90: int cc, ch;
1.13 christos 91: struct sockaddr ctl_addr;
1.1 cgd 92:
93: openlog("talkd", LOG_PID, LOG_DAEMON);
1.9 mrg 94: while ((ch = getopt(argc, argv, "dl")) != -1)
95: switch (ch) {
96: case 'd':
97: debug = 1;
98: break;
99: case 'l':
100: logging = 1;
101: break;
102: default:
1.12 cgd 103: syslog(LOG_ERR, "Usage: %s [-dl]", getprogname());
1.9 mrg 104: exit(1);
105: }
106:
1.10 mrg 107: if (gethostname(hostname, sizeof hostname) < 0) {
1.1 cgd 108: syslog(LOG_ERR, "gethostname: %m");
109: _exit(1);
110: }
1.5 christos 111: hostname[MAXHOSTNAMELEN] = '\0'; /* ensure null termination */
1.1 cgd 112: if (chdir(_PATH_DEV) < 0) {
113: syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV);
114: _exit(1);
115: }
116: signal(SIGALRM, timeout);
117: alarm(TIMEOUT);
118: for (;;) {
1.14 itojun 119: memset(&response, 0, sizeof(response));
1.1 cgd 120: cc = recv(0, (char *)mp, sizeof (*mp), 0);
121: if (cc != sizeof (*mp)) {
122: if (cc < 0 && errno != EINTR)
123: syslog(LOG_WARNING, "recv: %m");
124: continue;
125: }
1.13 christos 126:
1.14 itojun 127: mp->l_name[sizeof(mp->l_name) - 1] = '\0';
128: mp->r_name[sizeof(mp->r_name) - 1] = '\0';
129: mp->r_tty[sizeof(mp->r_tty) - 1] = '\0';
130:
1.16 itojun 131: lastmsgtime = time(0);
132: process_request(mp, &response);
133:
1.18 christos 134: tsa2sa(&ctl_addr, &mp->ctl_addr);
1.14 itojun 135: if (ctl_addr.sa_family != AF_INET)
136: continue;
1.13 christos 137:
1.1 cgd 138: /* can block here, is this what I want? */
1.13 christos 139: cc = sendto(sockt, (char *)&response, sizeof (response), 0,
140: &ctl_addr, sizeof (ctl_addr));
1.1 cgd 141: if (cc != sizeof (response))
142: syslog(LOG_WARNING, "sendto: %m");
143: }
144: }
145:
146: void
1.20.6.1! jym 147: timeout(int n)
1.1 cgd 148: {
1.14 itojun 149: int save_errno = errno;
1.1 cgd 150:
151: if (time(0) - lastmsgtime >= MAXIDLE)
152: _exit(0);
153: alarm(TIMEOUT);
1.14 itojun 154: errno = save_errno;
1.1 cgd 155: }
1.18 christos 156:
157: void
158: tsa2sa(struct sockaddr *sa, const struct talkd_sockaddr *tsa)
159: {
160: (void)memcpy(sa, tsa, sizeof(*tsa));
161: sa->sa_len = sizeof(*tsa);
162: sa->sa_family = tsa->sa_family;
163: }
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