usr.sbin/rpc.statd/statd.c

   1 /*
   2  * Copyright (c) 1995
   3  *      A.R. Gordon (andrew.gordon@net-tel.co.uk).  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed for the FreeBSD project
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY ANDREW GORDON AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/usr.sbin/rpc.statd/statd.c,v 1.6 1999/10/05 14:40:38 marcel Exp $
  33  */
  34
  35 /* main() function for status monitor daemon.  Some of the code in this */
  36 /* file was generated by running rpcgen /usr/include/rpcsvc/sm_inter.x  */
  37 /* The actual program logic is in the file procs.c                      */
  38
  39 #include <err.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <rpc/rpc.h>
  43 #include <rpc/rpc_com.h>
  44 #include <string.h>
  45 #include <syslog.h>
  46 #include <sys/types.h>
  47 #include <sys/wait.h>
  48 #include <signal.h>
  49 #include "statd.h"
  50
  51 int debug = 0;          /* Controls syslog() calls for debug messages   */
  52
  53 static void handle_sigchld(int);
  54 static void usage(void);
  55
  56 int
  57 main(int argc, char **argv)
  58 {
  59   struct sigaction sa;
  60   int maxrec = RPC_MAXDATASIZE;
  61
  62   if (argc > 1)
  63   {
  64     if (strcmp(argv[1], "-d"))
  65         usage();
  66     debug = 1;
  67   }
  68
  69   rpcb_unset(SM_PROG, SM_VERS, NULL);
  70
  71   rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
  72
  73   if (!svc_create(sm_prog_1, SM_PROG, SM_VERS, "udp"))
  74           errx(1, "cannot create udp service");
  75   if (!svc_create(sm_prog_1, SM_PROG, SM_VERS, "tcp"))
  76     errx(1, "cannot create tcp service");
  77   init_file("/var/db/statd.status");
  78
  79   /* Note that it is NOT sensible to run this program from inetd - the  */
  80   /* protocol assumes that it will run immediately at boot time.        */
  81   daemon(0, 0);
  82   openlog("rpc.statd", 0, LOG_DAEMON);
  83   if (debug) syslog(LOG_INFO, "Starting - debug enabled");
  84   else syslog(LOG_INFO, "Starting");
  85
  86   /* Install signal handler to collect exit status of child processes   */
  87   sa.sa_handler = handle_sigchld;
  88   sigemptyset(&sa.sa_mask);
  89   sigaddset(&sa.sa_mask, SIGCHLD);
  90   sa.sa_flags = SA_RESTART;
  91   sigaction(SIGCHLD, &sa, NULL);
  92
  93   /* Initialisation now complete - start operating                      */
  94   notify_hosts();       /* Forks a process (if necessary) to do the     */
  95                         /* SM_NOTIFY calls, which may be slow.          */
  96
  97   svc_run();    /* Should never return                                  */
  98   exit(1);
  99 }
 100
 101 static void
 102 usage(void)
 103 {
 104       fprintf(stderr, "usage: rpc.statd [-d]\n");
 105       exit(1);
 106 }
 107
 108 /* handle_sigchld ---------------------------------------------------------- */
 109 /*
 110    Purpose:     Catch SIGCHLD and collect process status
 111    Retruns:     Nothing.
 112    Notes:       No special action required, other than to collect the
 113                 process status and hence allow the child to die:
 114                 we only use child processes for asynchronous transmission
 115                 of SM_NOTIFY to other systems, so it is normal for the
 116                 children to exit when they have done their work.
 117 */
 118
 119 static void
 120 handle_sigchld(__unused int sig)
 121 {
 122   int pid, status;
 123   pid = wait4(-1, &status, WNOHANG, NULL);
 124   if (!pid) syslog(LOG_ERR, "Phantom SIGCHLD??");
 125   else if (status == 0)
 126   {
 127     if (debug) syslog(LOG_DEBUG, "Child %d exited OK", pid);
 128   }
 129   else syslog(LOG_ERR, "Child %d failed with status %d", pid,
 130     WEXITSTATUS(status));
 131 }