statd.c revision 14982 
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
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 <stdio.h>
40#include <rpc/rpc.h>
41#include <syslog.h>
42#include <sys/types.h>
43#include <sys/wait.h>
44#include <signal.h>
45#include "statd.h"
46
47#ifndef lint
48static char rcsid[] = "$id: $";
49#endif /* not lint */
50
51int debug = 0;		/* Controls syslog() calls for debug messages	*/
52
53extern void sm_prog_1(struct svc_req *rqstp, SVCXPRT *transp);
54static void handle_sigchld();
55
56main(int argc, char **argv)
57{
58  SVCXPRT *transp;
59  struct sigaction sa;
60
61  if (argc > 1)
62  {
63    if (strcmp(argv[1], "-d"))
64    {
65      fprintf(stderr, "Usage: rpc.statd [-d]\n");
66      exit(1);
67    }
68    debug = 1;
69  }
70
71  (void)pmap_unset(SM_PROG, SM_VERS);
72
73  transp = svcudp_create(RPC_ANYSOCK);
74  if (transp == NULL)
75  {
76    fprintf(stderr, "cannot create udp service.\n");
77    exit(1);
78  }
79  if (!svc_register(transp, SM_PROG, SM_VERS, sm_prog_1, IPPROTO_UDP))
80  {
81    fprintf(stderr, "unable to register (SM_PROG, SM_VERS, udp).\n");
82    exit(1);
83  }
84
85  transp = svctcp_create(RPC_ANYSOCK, 0, 0);
86  if (transp == NULL)
87  {
88    fprintf(stderr, "cannot create tcp service.\n");
89    exit(1);
90  }
91  if (!svc_register(transp, SM_PROG, SM_VERS, sm_prog_1, IPPROTO_TCP)) {
92    fprintf(stderr, "unable to register (SM_PROG, SM_VERS, tcp).\n");
93    exit(1);
94  }
95  init_file("/var/db/statd.status");
96
97  /* Note that it is NOT sensible to run this program from inetd - the 	*/
98  /* protocol assumes that it will run immediately at boot time.	*/
99  daemon(0, 0);
100  openlog("rpc.statd", 0, LOG_DAEMON);
101  if (debug) syslog(LOG_INFO, "Starting - debug enabled");
102  else syslog(LOG_INFO, "Starting");
103
104  /* Install signal handler to collect exit status of child processes	*/
105  sa.sa_handler = handle_sigchld;
106  sigemptyset(&sa.sa_mask);
107  sigaddset(&sa.sa_mask, SIGCHLD);
108  sa.sa_flags = SA_RESTART;
109  sigaction(SIGCHLD, &sa, NULL);
110
111  /* Initialisation now complete - start operating			*/
112  notify_hosts();	/* Forks a process (if necessary) to do the	*/
113			/* SM_NOTIFY calls, which may be slow.		*/
114
115  svc_run();	/* Should never return					*/
116  exit(1);
117}
118
119
120/* handle_sigchld ---------------------------------------------------------- */
121/*
122   Purpose:	Catch SIGCHLD and collect process status
123   Retruns:	Nothing.
124   Notes:	No special action required, other than to collect the
125		process status and hence allow the child to die:
126		we only use child processes for asynchronous transmission
127		of SM_NOTIFY to other systems, so it is normal for the
128		children to exit when they have done their work.
129*/
130
131static void handle_sigchld(int sig, int code, struct sigcontext *scp)
132{
133  int pid, status;
134  pid = wait4(-1, &status, WNOHANG, (struct rusage*)0);
135  if (!pid) syslog(LOG_ERR, "Phantom SIGCHLD??");
136  else if (status == 0)
137  {
138    if (debug) syslog(LOG_DEBUG, "Child %d exited OK", pid);
139  }
140  else syslog(LOG_ERR, "Child %d failed with status %d", pid,
141    WEXITSTATUS(status));
142}
143
144