statd.c revision 100125 
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 */
33
34#ifndef lint
35static const char rcsid[] =
36  "$FreeBSD: head/usr.sbin/rpc.statd/statd.c 100125 2002-07-15 19:00:34Z alfred $";
37#endif /* not lint */
38
39/* main() function for status monitor daemon.  Some of the code in this	*/
40/* file was generated by running rpcgen /usr/include/rpcsvc/sm_inter.x	*/
41/* The actual program logic is in the file procs.c			*/
42
43#include <err.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <rpc/rpc.h>
47#include <string.h>
48#include <syslog.h>
49#include <sys/types.h>
50#include <sys/wait.h>
51#include <signal.h>
52#include "statd.h"
53
54int debug = 0;		/* Controls syslog() calls for debug messages	*/
55
56extern void sm_prog_1(struct svc_req *rqstp, SVCXPRT *transp);
57static void handle_sigchld(int sig);
58static void usage(void);
59
60int
61main(int argc, char **argv)
62{
63  struct sigaction sa;
64
65  if (argc > 1)
66  {
67    if (strcmp(argv[1], "-d"))
68	usage();
69    debug = 1;
70  }
71
72  (void)rpcb_unset(SM_PROG, SM_VERS, NULL);
73
74  if (!svc_create(sm_prog_1, SM_PROG, SM_VERS, "udp"))
75    errx(1, "cannot create udp service");
76  if (!svc_create(sm_prog_1, SM_PROG, SM_VERS, "tcp"))
77    errx(1, "cannot create tcp service");
78  init_file("/var/db/statd.status");
79
80  /* Note that it is NOT sensible to run this program from inetd - the 	*/
81  /* protocol assumes that it will run immediately at boot time.	*/
82  daemon(0, 0);
83  openlog("rpc.statd", 0, LOG_DAEMON);
84  if (debug) syslog(LOG_INFO, "Starting - debug enabled");
85  else syslog(LOG_INFO, "Starting");
86
87  /* Install signal handler to collect exit status of child processes	*/
88  sa.sa_handler = handle_sigchld;
89  sigemptyset(&sa.sa_mask);
90  sigaddset(&sa.sa_mask, SIGCHLD);
91  sa.sa_flags = SA_RESTART;
92  sigaction(SIGCHLD, &sa, NULL);
93
94  /* Initialisation now complete - start operating			*/
95  notify_hosts();	/* Forks a process (if necessary) to do the	*/
96			/* SM_NOTIFY calls, which may be slow.		*/
97
98  svc_run();	/* Should never return					*/
99  exit(1);
100}
101
102static void
103usage()
104{
105      fprintf(stderr, "usage: rpc.statd [-d]\n");
106      exit(1);
107}
108
109/* handle_sigchld ---------------------------------------------------------- */
110/*
111   Purpose:	Catch SIGCHLD and collect process status
112   Retruns:	Nothing.
113   Notes:	No special action required, other than to collect the
114		process status and hence allow the child to die:
115		we only use child processes for asynchronous transmission
116		of SM_NOTIFY to other systems, so it is normal for the
117		children to exit when they have done their work.
118*/
119
120static void handle_sigchld(int sig __unused)
121{
122  int pid, status;
123  pid = wait4(-1, &status, WNOHANG, (struct rusage*)0);
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}
132
133