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  * $DragonFly: src/usr.sbin/rpc.statd/statd.c,v 1.5 2005/11/25 00:32:49 swildner Exp $
  34  */
  35
  36 /* main() function for status monitor daemon.  Some of the code in this */
  37 /* file was generated by running rpcgen /usr/include/rpcsvc/sm_inter.x  */
  38 /* The actual program logic is in the file procs.c                      */
  39
  40 #include <err.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <rpc/rpc.h>
  44 #include <rpc/pmap_clnt.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 extern void sm_prog_1(struct svc_req *rqstp, SVCXPRT *transp);
  54 static void handle_sigchld();
  55 static void usage(void);
  56
  57 int
  58 main(int argc, char **argv)
  59 {
  60   SVCXPRT *transp;
  61   struct sigaction sa;
  62
  63   if (argc > 1)
  64   {
  65     if (strcmp(argv[1], "-d"))
  66         usage();
  67     debug = 1;
  68   }
  69
  70   pmap_unset(SM_PROG, SM_VERS);
  71
  72   transp = svcudp_create(RPC_ANYSOCK);
  73   if (transp == NULL)
  74     errx(1, "cannot create udp service");
  75   if (!svc_register(transp, SM_PROG, SM_VERS, sm_prog_1, IPPROTO_UDP))
  76     errx(1, "unable to register (SM_PROG, SM_VERS, udp)");
  77
  78   transp = svctcp_create(RPC_ANYSOCK, 0, 0);
  79   if (transp == NULL)
  80     errx(1, "cannot create tcp service");
  81   if (!svc_register(transp, SM_PROG, SM_VERS, sm_prog_1, IPPROTO_TCP))
  82     errx(1, "unable to register (SM_PROG, SM_VERS, tcp)");
  83   init_file("/var/db/statd.status");
  84
  85   /* Note that it is NOT sensible to run this program from inetd - the  */
  86   /* protocol assumes that it will run immediately at boot time.        */
  87   daemon(0, 0);
  88   openlog("rpc.statd", 0, LOG_DAEMON);
  89   if (debug) syslog(LOG_INFO, "Starting - debug enabled");
  90   else syslog(LOG_INFO, "Starting");
  91
  92   /* Install signal handler to collect exit status of child processes   */
  93   sa.sa_handler = handle_sigchld;
  94   sigemptyset(&sa.sa_mask);
  95   sigaddset(&sa.sa_mask, SIGCHLD);
  96   sa.sa_flags = SA_RESTART;
  97   sigaction(SIGCHLD, &sa, NULL);
  98
  99   /* Initialisation now complete - start operating                      */
 100   notify_hosts();       /* Forks a process (if necessary) to do the     */
 101                         /* SM_NOTIFY calls, which may be slow.          */
 102
 103   svc_run();    /* Should never return                                  */
 104   exit(1);
 105 }
 106
 107 static void
 108 usage(void)
 109 {
 110       fprintf(stderr, "usage: rpc.statd [-d]\n");
 111       exit(1);
 112 }
 113
 114 /* handle_sigchld ---------------------------------------------------------- */
 115 /*
 116    Purpose:     Catch SIGCHLD and collect process status
 117    Retruns:     Nothing.
 118    Notes:       No special action required, other than to collect the
 119                 process status and hence allow the child to die:
 120                 we only use child processes for asynchronous transmission
 121                 of SM_NOTIFY to other systems, so it is normal for the
 122                 children to exit when they have done their work.
 123 */
 124
 125 static void
 126 handle_sigchld(int sig, int code, struct sigcontext *scp)
 127 {
 128   int pid, status;
 129   pid = wait4(-1, &status, WNOHANG, NULL);
 130   if (!pid) syslog(LOG_ERR, "Phantom SIGCHLD??");
 131   else if (status == 0)
 132   {
 133     if (debug) syslog(LOG_DEBUG, "Child %d exited OK", pid);
 134   }
 135   else syslog(LOG_ERR, "Child %d failed with status %d", pid,
 136     WEXITSTATUS(status));
 137 }
 138