233 lines
6.7 KiB
C
233 lines
6.7 KiB
C
/*
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* Copyright (c) 1995
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* A.R. Gordon (andrew.gordon@net-tel.co.uk). All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the FreeBSD project
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY ANDREW GORDON AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/* main() function for status monitor daemon. Some of the code in this */
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/* file was generated by running rpcgen /usr/include/rpcsvc/sm_inter.x */
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/* The actual program logic is in the file procs.c */
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#include <stdio.h>
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#include <rpc/rpc.h>
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#include <syslog.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include "statd.h"
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#ifndef lint
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static char rcsid[] = "$id: $";
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#endif /* not lint */
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int debug = 0; /* Controls syslog() calls for debug messages */
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static void sm_prog_1();
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static void handle_sigchld();
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main(int argc, char **argv)
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{
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SVCXPRT *transp;
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struct sigaction sa;
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if (argc > 1)
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{
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if (strcmp(argv[1], "-d"))
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{
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fprintf(stderr, "Usage: rpc.statd [-d]\n");
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exit(1);
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}
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debug = 1;
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}
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(void)pmap_unset(SM_PROG, SM_VERS);
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transp = svcudp_create(RPC_ANYSOCK);
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if (transp == NULL)
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{
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fprintf(stderr, "cannot create udp service.\n");
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exit(1);
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}
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if (!svc_register(transp, SM_PROG, SM_VERS, sm_prog_1, IPPROTO_UDP))
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{
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fprintf(stderr, "unable to register (SM_PROG, SM_VERS, udp).\n");
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exit(1);
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}
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transp = svctcp_create(RPC_ANYSOCK, 0, 0);
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if (transp == NULL)
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{
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fprintf(stderr, "cannot create tcp service.\n");
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exit(1);
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}
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if (!svc_register(transp, SM_PROG, SM_VERS, sm_prog_1, IPPROTO_TCP)) {
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fprintf(stderr, "unable to register (SM_PROG, SM_VERS, tcp).\n");
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exit(1);
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}
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init_file("/var/db/statd.status");
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/* Note that it is NOT sensible to run this program from inetd - the */
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/* protocol assumes that it will run immediately at boot time. */
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daemon(0, 0);
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openlog("rpc.statd", 0, LOG_DAEMON);
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if (debug) syslog(LOG_INFO, "Starting - debug enabled");
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else syslog(LOG_INFO, "Starting");
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/* Install signal handler to collect exit status of child processes */
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sa.sa_handler = handle_sigchld;
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sigemptyset(&sa.sa_mask);
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sigaddset(&sa.sa_mask, SIGCHLD);
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sa.sa_flags = SA_RESTART;
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sigaction(SIGCHLD, &sa, NULL);
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/* Initialisation now complete - start operating */
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notify_hosts(); /* Forks a process (if necessary) to do the */
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/* SM_NOTIFY calls, which may be slow. */
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svc_run(); /* Should never return */
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exit(1);
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}
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/* handle_sigchld ---------------------------------------------------------- */
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/*
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Purpose: Catch SIGCHLD and collect process status
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Retruns: Nothing.
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Notes: No special action required, other than to collect the
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process status and hence allow the child to die:
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we only use child processes for asynchronous transmission
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of SM_NOTIFY to other systems, so it is normal for the
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children to exit when they have done their work.
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*/
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static void handle_sigchld(int sig, int code, struct sigcontext *scp)
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{
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int pid, status;
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pid = wait4(-1, &status, WNOHANG, (struct rusage*)0);
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if (!pid) syslog(LOG_ERR, "Phantom SIGCHLD??");
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else if (status == 0)
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{
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if (debug) syslog(LOG_DEBUG, "Child %d exited OK", pid);
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}
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else syslog(LOG_ERR, "Child %d failed with status %d", pid,
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WEXITSTATUS(status));
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}
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/* sm_prog1 ---------------------------------------------------------------- */
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/*
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Purpose: Handle one RPC request
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Returns: Nothing
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Notes: Called from RPC libraray on receipt of a request.
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Code for this function was auto-generated by rpcgen.
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*/
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static void
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sm_prog_1(struct svc_req *rqstp, SVCXPRT *transp)
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{
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union
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{
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struct sm_name sm_stat_1_arg;
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struct mon sm_mon_1_arg;
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struct mon_id sm_unmon_1_arg;
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struct my_id sm_unmon_all_1_arg;
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struct stat_chge sm_notify_1_arg;
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} argument;
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char *result;
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bool_t (*xdr_argument)(), (*xdr_result)();
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char *(*local)();
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switch (rqstp->rq_proc)
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{
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case NULLPROC:
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(void)svc_sendreply(transp, xdr_void, (char *)NULL);
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return;
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case SM_STAT:
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xdr_argument = xdr_sm_name;
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xdr_result = xdr_sm_stat_res;
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local = (char *(*)()) sm_stat_1;
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break;
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case SM_MON:
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xdr_argument = xdr_mon;
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xdr_result = xdr_sm_stat_res;
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local = (char *(*)()) sm_mon_1;
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break;
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case SM_UNMON:
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xdr_argument = xdr_mon_id;
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xdr_result = xdr_sm_stat;
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local = (char *(*)()) sm_unmon_1;
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break;
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case SM_UNMON_ALL:
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xdr_argument = xdr_my_id;
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xdr_result = xdr_sm_stat;
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local = (char *(*)()) sm_unmon_all_1;
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break;
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case SM_SIMU_CRASH:
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xdr_argument = xdr_void;
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xdr_result = xdr_void;
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local = (char *(*)()) sm_simu_crash_1;
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break;
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case SM_NOTIFY:
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xdr_argument = xdr_stat_chge;
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xdr_result = xdr_void;
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local = (char *(*)()) sm_notify_1;
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break;
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default:
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svcerr_noproc(transp);
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return;
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}
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bzero((char *)&argument, sizeof(argument));
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if (!svc_getargs(transp, xdr_argument, (caddr_t)&argument))
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{
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svcerr_decode(transp);
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return;
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}
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result = (*local)(&argument, rqstp);
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if (result != NULL && !svc_sendreply(transp, xdr_result, result))
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{
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svcerr_systemerr(transp);
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}
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if (!svc_freeargs(transp, xdr_argument, (caddr_t)&argument))
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{
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syslog(LOG_ERR, "unable to free arguments");
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exit(1);
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}
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}
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