freebsd-dev/usr.sbin/rpc.lockd/lockd.c

/*	$NetBSD: lockd.c,v 1.7 2000/08/12 18:08:44 thorpej Exp $	*/
/*	$FreeBSD$ */

/*
 * Copyright (c) 1995
 *	A.R. Gordon (andrew.gordon@net-tel.co.uk).  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed for the FreeBSD project
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY ANDREW GORDON AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: lockd.c,v 1.7 2000/08/12 18:08:44 thorpej Exp $");
#endif

/*
 * main() function for NFS lock daemon.  Most of the code in this
 * file was generated by running rpcgen /usr/include/rpcsvc/nlm_prot.x.
 *
 * The actual program logic is in the file lock_proc.c
 */

#include <sys/types.h>
#include <sys/socket.h>

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <syslog.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include <libutil.h>
#include <netconfig.h>

#include <rpc/rpc.h>
#include <rpcsvc/sm_inter.h>

#include "lockd.h"
#include <rpcsvc/nlm_prot.h>

int		debug_level = 0;	/* 0 = no debugging syslog() calls */
int		_rpcsvcdirty = 0;

int grace_expired;
int nsm_state;
pid_t client_pid;
struct mon mon_host;

void	init_nsm(void);
int	main __P((int, char **));
void	nlm_prog_0 __P((struct svc_req *, SVCXPRT *));
void	nlm_prog_1 __P((struct svc_req *, SVCXPRT *));
void	nlm_prog_3 __P((struct svc_req *, SVCXPRT *));
void	nlm_prog_4 __P((struct svc_req *, SVCXPRT *));
void	usage __P((void));

void sigalarm_handler __P((int));

char *transports[] = { "udp", "tcp", "udp6", "tcp6" };

int
main(argc, argv)
	int argc;
	char **argv;
{
	SVCXPRT *transp;
	int ch, i, maxindex, s;
	struct sigaction sigchild, sigalarm;
	int grace_period = 30;
	struct netconfig *nconf;

	while ((ch = getopt(argc, argv, "d:g:")) != (-1)) {
		switch (ch) {
		case 'd':
			debug_level = atoi(optarg);
			if (!debug_level) {
				usage();
				/* NOTREACHED */
			}
			break;
		case 'g':
			grace_period = atoi(optarg);
			if (!grace_period) {
				usage();
				/* NOTREACHED */
			}
			break;
		default:
		case '?':
			usage();
			/* NOTREACHED */
		}
	}
	if (geteuid()) { /* This command allowed only to root */
		fprintf(stderr, "Sorry. You are not superuser\n");
		exit(1);
        }

	(void)rpcb_unset(NLM_PROG, NLM_SM, NULL);
	(void)rpcb_unset(NLM_PROG, NLM_VERS, NULL);
	(void)rpcb_unset(NLM_PROG, NLM_VERSX, NULL);
	(void)rpcb_unset(NLM_PROG, NLM_VERS4, NULL);

	/*
	 * Check if IPv6 support is present.
	 */
	s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
	if (s < 0)
		maxindex = 2;
	else {
		close(s);
		maxindex = 4;
	}

	for (i = 0; i < maxindex; i++) {
		nconf = getnetconfigent(transports[i]);
		if (nconf == NULL)
			errx(1, "cannot get udp netconf.");

		transp = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
		if (transp == NULL) {
			errx(1, "cannot create %s service.", transports[i]);
			/* NOTREACHED */
		}
		if (!svc_reg(transp, NLM_PROG, NLM_SM, nlm_prog_0, nconf)) {
			errx(1, "unable to register (NLM_PROG, NLM_SM, %s)",
			    transports[i]);
			/* NOTREACHED */
		}
		if (!svc_reg(transp, NLM_PROG, NLM_VERS, nlm_prog_1, nconf)) {
			errx(1, "unable to register (NLM_PROG, NLM_VERS, %s)",
			    transports[i]);
			/* NOTREACHED */
		}
		if (!svc_reg(transp, NLM_PROG, NLM_VERSX, nlm_prog_3, nconf)) {
			errx(1, "unable to register (NLM_PROG, NLM_VERSX, %s)",
			    transports[i]);
			/* NOTREACHED */
		}
		if (!svc_reg(transp, NLM_PROG, NLM_VERS4, nlm_prog_4, nconf)) {
			errx(1, "unable to register (NLM_PROG, NLM_VERS4, %s)",
			    transports[i]);
			/* NOTREACHED */
		}
		freenetconfigent(nconf);
	}

	/*
	 * Note that it is NOT sensible to run this program from inetd - the
	 * protocol assumes that it will run immediately at boot time.
	 */
	if (daemon(0, 0)) {
		err(1, "cannot fork");
		/* NOTREACHED */
	}

	openlog("rpc.lockd", 0, LOG_DAEMON);
	if (debug_level)
		syslog(LOG_INFO, "Starting, debug level %d", debug_level);
	else
		syslog(LOG_INFO, "Starting");

	sigchild.sa_handler = sigchild_handler;
	sigemptyset(&sigchild.sa_mask);
	sigchild.sa_flags = SA_RESTART;
	if (sigaction(SIGCHLD, &sigchild, NULL) != 0) {
		syslog(LOG_WARNING, "sigaction(SIGCHLD) failed: %s",
		    strerror(errno));
		exit(1);
	}
	sigalarm.sa_handler = sigalarm_handler;
	sigemptyset(&sigalarm.sa_mask);
	sigalarm.sa_flags = SA_RESETHAND; /* should only happen once */
	sigalarm.sa_flags |= SA_RESTART;
	if (sigaction(SIGALRM, &sigalarm, NULL) != 0) {
		syslog(LOG_WARNING, "sigaction(SIGALRM) failed: %s",
		    strerror(errno));
		exit(1);
	}
	grace_expired = 0;
	if (alarm(10) < 0) {
		syslog(LOG_WARNING, "alarm failed: %s",
		    strerror(errno));
		exit(1);
	}

	init_nsm();

	client_pid = client_request();

	svc_run();		/* Should never return */
	exit(1);
}

void
sigalarm_handler(s)
	int s;
{
	grace_expired = 1;
}

void
usage()
{
	errx(1, "usage: rpc.lockd [-d <debuglevel>] [-g <grace period>]");
}

/*
 * init_nsm --
 *	Reset the NSM state-of-the-world and acquire its state.
 */
void
init_nsm(void)
{
	enum clnt_stat ret;
	my_id id;
	sm_stat stat;

	/*
	 * !!!
	 * The my_id structure isn't used by the SM_UNMON_ALL call, as far
	 * as I know.  Leave it empty for now.
	 */
	memset(&id, 0, sizeof(id));
	id.my_name = "NFS NLM";

	/*
	 * !!!
	 * The statd program must already be registered when lockd runs.
	 */
	do {
		ret = callrpc("localhost", SM_PROG, SM_VERS, SM_UNMON_ALL,
		    xdr_my_id, &id, xdr_sm_stat, &stat);
		if (ret == RPC_PROGUNAVAIL) {
			warnx("%lu %s", SM_PROG, clnt_sperrno(ret));
			sleep(2);
			continue;
		}
		break;
	} while (0);

	if (ret != 0) {
		errx(1, "%lu %s", SM_PROG, clnt_sperrno(ret));
	}

	nsm_state = stat.state;

	/* setup constant data for SM_MON calls */
	mon_host.mon_id.my_id.my_name = "localhost";
	mon_host.mon_id.my_id.my_prog = NLM_PROG;
	mon_host.mon_id.my_id.my_vers = NLM_SM;
	mon_host.mon_id.my_id.my_proc = NLM_SM_NOTIFY;  /* bsdi addition */
}