Return to talkd.c CVS log

Up to [cvs.NetBSD.org] / src / libexec / talkd

Annotation of src/libexec/talkd/talkd.c, Revision 1.8

1.8     ! mrg         1: /*     $NetBSD: talkd.c,v 1.7 1997/06/29 19:19:15 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
1.8     ! mrg        46: __RCSID("$NetBSD: talkd.c,v 1.7 1997/06/29 19:19:15 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;
                     79: long   lastmsgtime;
                     80:
1.4       explorer   81: char   hostname[MAXHOSTNAMELEN + 1];
1.1       cgd        82:
                     83: #define TIMEOUT 30
                     84: #define MAXIDLE 120
                     85:
1.6       christos   86: static void timeout __P((int));
                     87: int    main __P((int, char *[]));
                     88:
                     89: int
1.1       cgd        90: main(argc, argv)
                     91:        int argc;
                     92:        char *argv[];
                     93: {
1.6       christos   94:        CTL_MSG *mp = &request;
1.1       cgd        95:        int cc;
                     96:
                     97:        openlog("talkd", LOG_PID, LOG_DAEMON);
                     98:        if (gethostname(hostname, sizeof (hostname) - 1) < 0) {
                     99:                syslog(LOG_ERR, "gethostname: %m");
                    100:                _exit(1);
                    101:        }
1.5       christos  102:        hostname[MAXHOSTNAMELEN] = '\0';  /* ensure null termination */
1.1       cgd       103:        if (chdir(_PATH_DEV) < 0) {
                    104:                syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV);
                    105:                _exit(1);
                    106:        }
                    107:        if (argc > 1 && strcmp(argv[1], "-d") == 0)
                    108:                debug = 1;
                    109:        signal(SIGALRM, timeout);
                    110:        alarm(TIMEOUT);
                    111:        for (;;) {
                    112:                extern int errno;
                    113:
                    114:                cc = recv(0, (char *)mp, sizeof (*mp), 0);
                    115:                if (cc != sizeof (*mp)) {
                    116:                        if (cc < 0 && errno != EINTR)
                    117:                                syslog(LOG_WARNING, "recv: %m");
                    118:                        continue;
                    119:                }
                    120:                lastmsgtime = time(0);
                    121:                process_request(mp, &response);
                    122:                /* can block here, is this what I want? */
                    123:                cc = sendto(sockt, (char *)&response,
                    124:                    sizeof (response), 0, (struct sockaddr *)&mp->ctl_addr,
                    125:                    sizeof (mp->ctl_addr));
                    126:                if (cc != sizeof (response))
                    127:                        syslog(LOG_WARNING, "sendto: %m");
                    128:        }
                    129: }
                    130:
                    131: void
1.6       christos  132: timeout(n)
                    133:        int n;
1.1       cgd       134: {
                    135:
                    136:        if (time(0) - lastmsgtime >= MAXIDLE)
                    137:                _exit(0);
                    138:        alarm(TIMEOUT);
                    139: }