talkd.tproj/talkd.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1983, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57 #ifndef lint
  58 static char copyright[] =
  59 "@(#) Copyright (c) 1983, 1993\n\
  60         The Regents of the University of California.  All rights reserved.\n";
  61 #endif /* not lint */
  62
  63 #ifndef lint
  64 static char sccsid[] = "@(#)talkd.c     8.1 (Berkeley) 6/4/93";
  65 #endif /* not lint */
  66
  67 /*
  68  * The top level of the daemon, the format is heavily borrowed
  69  * from rwhod.c. Basically: find out who and where you are;
  70  * disconnect all descriptors and ttys, and then endless
  71  * loop on waiting for and processing requests
  72  */
  73 #include <sys/types.h>
  74 #include <sys/socket.h>
  75 #include <protocols/talkd.h>
  76 #include <signal.h>
  77 #include <syslog.h>
  78 #include <time.h>
  79 #include <errno.h>
  80 #include <unistd.h>
  81 #include <stdio.h>
  82 #include <stdlib.h>
  83 #include <string.h>
  84 #include <paths.h>
  85 #include <sys/param.h>
  86 #include "talkd.h"
  87
  88 CTL_MSG         request;
  89 CTL_RESPONSE    response;
  90
  91 int     sockt;
  92 int     debug = 0;
  93 void    timeout();
  94 long    lastmsgtime;
  95
  96 char    hostname[MAXHOSTNAMELEN + 1];
  97
  98 #define TIMEOUT 30
  99 #define MAXIDLE 120
 100
 101 void
 102 main(argc, argv)
 103         int argc;
 104         char *argv[];
 105 {
 106         register CTL_MSG *mp = &request;
 107         int cc;
 108
 109         if (getuid()) {
 110                 fprintf(stderr, "%s: getuid: not super-user\n", argv[0]);
 111                 exit(1);
 112         }
 113         openlog("talkd", LOG_PID, LOG_DAEMON);
 114         if (gethostname(hostname, sizeof (hostname) - 1) < 0) {
 115                 syslog(LOG_ERR, "gethostname: %m");
 116                 _exit(1);
 117         }
 118         if (chdir(_PATH_DEV) < 0) {
 119                 syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV);
 120                 _exit(1);
 121         }
 122         if (argc > 1 && strcmp(argv[1], "-d") == 0)
 123                 debug = 1;
 124         signal(SIGALRM, timeout);
 125         alarm(TIMEOUT);
 126         for (;;) {
 127                 extern int errno;
 128
 129                 cc = recv(0, (char *)mp, sizeof (*mp), 0);
 130                 if (cc != sizeof (*mp)) {
 131                         if (cc < 0 && errno != EINTR)
 132                                 syslog(LOG_WARNING, "recv: %m");
 133                         continue;
 134                 }
 135                 lastmsgtime = time(0);
 136                 process_request(mp, &response);
 137                 /* can block here, is this what I want? */
 138                 cc = sendto(sockt, (char *)&response,
 139                     sizeof (response), 0, (struct sockaddr *)&mp->ctl_addr,
 140                     sizeof (mp->ctl_addr));
 141                 if (cc != sizeof (response))
 142                         syslog(LOG_WARNING, "sendto: %m");
 143         }
 144 }
 145
 146 void
 147 timeout()
 148 {
 149
 150         if (time(0) - lastmsgtime >= MAXIDLE)
 151                 _exit(0);
 152         alarm(TIMEOUT);
 153 }