4.3BSD - /usr/src/etc/talkd/talkd.c

   1: /*
   2:  * Copyright (c) 1983 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #ifndef lint
   8: char copyright[] =
   9: "@(#) Copyright (c) 1983 Regents of the University of California.\n\
  10:  All rights reserved.\n";
  11: #endif not lint
  12: 
  13: #ifndef lint
  14: static char sccsid[] = "@(#)talkd.c	5.2 (Berkeley) 3/13/86";
  15: #endif not lint
  16: 
  17: /*
  18:  * The top level of the daemon, the format is heavily borrowed
  19:  * from rwhod.c. Basically: find out who and where you are;
  20:  * disconnect all descriptors and ttys, and then endless
  21:  * loop on waiting for and processing requests
  22:  */
  23: #include <stdio.h>
  24: #include <errno.h>
  25: #include <signal.h>
  26: #include <syslog.h>
  27: 
  28: #include <protocols/talkd.h>
  29: 
  30: CTL_MSG     request;
  31: CTL_RESPONSE    response;
  32: 
  33: int sockt;
  34: int debug = 0;
  35: int timeout();
  36: long    lastmsgtime;
  37: 
  38: char    hostname[32];
  39: 
  40: #define TIMEOUT 30
  41: #define MAXIDLE 120
  42: 
  43: main(argc, argv)
  44:     int argc;
  45:     char *argv[];
  46: {
  47:     register CTL_MSG *mp = &request;
  48:     int cc;
  49: 
  50:     if (getuid()) {
  51:         fprintf(stderr, "%s: getuid: not super-user", argv[0]);
  52:         exit(1);
  53:     }
  54:     openlog("talkd", LOG_PID, LOG_DAEMON);
  55:     if (gethostname(hostname, sizeof (hostname) - 1) < 0) {
  56:         syslog(LOG_ERR, "gethostname: %m");
  57:         _exit(1);
  58:     }
  59:     if (chdir("/dev") < 0) {
  60:         syslog(LOG_ERR, "chdir: /dev: %m");
  61:         _exit(1);
  62:     }
  63:     if (argc > 1 && strcmp(argv[1], "-d") == 0)
  64:         debug = 1;
  65:     signal(SIGALRM, timeout);
  66:     alarm(TIMEOUT);
  67:     for (;;) {
  68:         extern int errno;
  69: 
  70:         cc = recv(0, (char *)mp, sizeof (*mp), 0);
  71:         if (cc != sizeof (*mp)) {
  72:             if (cc < 0 && errno != EINTR)
  73:                 syslog(LOG_WARNING, "recv: %m");
  74:             continue;
  75:         }
  76:         lastmsgtime = time(0);
  77:         process_request(mp, &response);
  78:         /* can block here, is this what I want? */
  79:         cc = sendto(sockt, (char *)&response,
  80:             sizeof (response), 0, &mp->ctl_addr, sizeof (mp->ctl_addr));
  81:         if (cc != sizeof (response))
  82:             syslog(LOG_WARNING, "sendto: %m");
  83:     }
  84: }
  85: 
  86: timeout()
  87: {
  88: 
  89:     if (time(0) - lastmsgtime >= MAXIDLE)
  90:         _exit(0);
  91:     alarm(TIMEOUT);
  92: }

Defined functions

Defined variables

Defined macros