lock_proc.c   [plain text]


/*
 * Copyright (c) 2002-2008 Apple Inc.  All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*	$NetBSD: lock_proc.c,v 1.7 2000/10/11 20:23:56 is Exp $	*/
/*	$FreeBSD: src/usr.sbin/rpc.lockd/lock_proc.c,v 1.10 2002/03/22 20:00:10 alfred Exp $ */
/*
 * 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: lock_proc.c,v 1.7 2000/10/11 20:23:56 is Exp $");
#endif

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

#include <netinet/in.h>
#include <arpa/inet.h>

#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <stdlib.h>
#include <sys/queue.h>

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

#include "lockd.h"
#include "lockd_lock.h"


#define	CLIENT_CACHE_SIZE	64	/* No. of client sockets cached */
#define	CLIENT_CACHE_LIFETIME	120	/* In seconds */

static void	log_from_addr(const char *, struct svc_req *);
static void	log_netobj(netobj *obj);

/* log_from_addr ----------------------------------------------------------- */
/*
 * Purpose:	Log name of function called and source address
 * Returns:	Nothing
 * Notes:	Extracts the source address from the transport handle
 *		passed in as part of the called procedure specification
 */
static void
log_from_addr(fun_name, req)
	const char *fun_name;
	struct svc_req *req;
{
	struct sockaddr_in *addr;
	char hostname_buf[NI_MAXHOST];

	addr = svc_getcaller(req->rq_xprt);
	if (getnameinfo((struct sockaddr *)addr, sizeof(*addr), hostname_buf, sizeof hostname_buf,
	    NULL, 0, 0) != 0)
		return;

	syslog(LOG_DEBUG, "%s from %s", fun_name, hostname_buf);
}

/* log_netobj ----------------------------------------------------------- */
/*
 * Purpose:	Log a netobj
 * Returns:	Nothing
 * Notes:	This function should only really be called as part of
 *  		a debug subsystem.
*/
static void
log_netobj(obj)
	netobj *obj;
{
	char objvalbuffer[(sizeof(char)*2)*MAX_NETOBJ_SZ+2];
	char objascbuffer[sizeof(char)*MAX_NETOBJ_SZ+1];
	unsigned int i, maxlen;
	char *tmp1, *tmp2;

	/* Notify of potential security attacks */
	if (obj->n_len > MAX_NETOBJ_SZ)	{
		syslog(LOG_DEBUG, "SOMEONE IS TRYING TO DO SOMETHING NASTY!\n");
		syslog(LOG_DEBUG, "netobj too large! Should be %d was %d\n",
		    MAX_NETOBJ_SZ, obj->n_len);
	}
	/* Prevent the security hazard from the buffer overflow */
	maxlen = (obj->n_len < MAX_NETOBJ_SZ ? obj->n_len : MAX_NETOBJ_SZ);
	for (i=0, tmp1 = objvalbuffer, tmp2 = objascbuffer; i < maxlen;
	    i++, tmp1 +=2, tmp2 +=1) {
		snprintf(tmp1, 2+1, "%02X", *(obj->n_bytes+i));
		snprintf(tmp2, 1+1, "%c", *(obj->n_bytes+i));
	}
	*tmp1 = '\0';
	*tmp2 = '\0';
	syslog(LOG_DEBUG,"netobjvals: %s\n",objvalbuffer);
	syslog(LOG_DEBUG,"netobjascs: %s\n",objascbuffer);
}
/* get_client -------------------------------------------------------------- */
/*
 * Purpose:	Get a CLIENT* for making RPC calls to lockd on given host
 * Returns:	CLIENT* pointer, from clnt_udp_create, or NULL if error
 * Notes:	Creating a CLIENT* is quite expensive, involving a
 *		conversation with the remote portmapper to get the
 *		port number.  Since a given client is quite likely
 *		to make several locking requests in succession, it is
 *		desirable to cache the created CLIENT*.
 *
 *		Since we are using UDP rather than TCP, there is no cost
 *		to the remote system in keeping these cached indefinitely.
 *		Unfortunately there is a snag: if the remote system
 *		reboots, the cached portmapper results will be invalid,
 *		and we will never detect this since all of the xxx_msg()
 *		calls return no result - we just fire off a udp packet
 *		and hope for the best.
 *
 *		We solve this by discarding cached values after two
 *		minutes, regardless of whether they have been used
 *		in the meanwhile (since a bad one might have been used
 *		plenty of times, as the host keeps retrying the request
 *		and we keep sending the reply back to the wrong port).
 *
 *		Given that the entries will always expire in the order
 *		that they were created, there is no point in a LRU
 *		algorithm for when the cache gets full - entries are
 *		always re-used in sequence.
 */
static CLIENT *clnt_cache_ptr[CLIENT_CACHE_SIZE];
static long clnt_cache_time[CLIENT_CACHE_SIZE];	/* time entry created */
static struct sockaddr_storage clnt_cache_addr[CLIENT_CACHE_SIZE];
static rpcvers_t clnt_cache_vers[CLIENT_CACHE_SIZE];
static int clnt_cache_next_to_use = 0;

/*
 * Because lockd is single-threaded, slow/unresponsive portmappers on
 * clients can cause serious performance issues.  So, we keep a list of
 * these bad hosts, and limit how often we try to get_client() for those hosts.
 */
struct badhost {
	TAILQ_ENTRY(badhost) list;
	struct sockaddr_storage addr;	/* host address */
	int count;			/* # of occurences */
	time_t timelast;		/* last attempted */
	time_t timenext;		/* next allowed */
};
TAILQ_HEAD(badhostlist_head, badhost);
static struct badhostlist_head badhostlist_head = TAILQ_HEAD_INITIALIZER(badhostlist_head);
#define	BADHOST_CLIENT_TOOK_TOO_LONG	5	/* In seconds */
#define	BADHOST_NFS_CLIENT_SIDE_DELAY	60	/* In seconds */
#define	BADHOST_INITIAL_DELAY		120	/* In seconds */
#define	BADHOST_MAXIMUM_DELAY		3600	/* In seconds */
#define	BADHOST_DELAY_INCREMENT		300	/* In seconds */

int
addrcmp(const struct sockaddr *sa1, const struct sockaddr *sa2)
{
	int len;
	void *p1, *p2;

	if (sa1->sa_family != sa2->sa_family)
		return -1;

	switch (sa1->sa_family) {
	case AF_INET:
		p1 = &((struct sockaddr_in *)sa1)->sin_addr;
		p2 = &((struct sockaddr_in *)sa2)->sin_addr;
		len = 4;
		break;
	case AF_INET6:
		p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
		p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
		len = 16;
		break;
	default:
		return -1;
	}

	return memcmp(p1, p2, len);
}

CLIENT *
get_client(host_addr, vers, client_request)
	struct sockaddr *host_addr;
	rpcvers_t vers;
	int client_request;
{
	CLIENT *client, *cached_client;
	struct timeval retry_time, time_now;
	int i;
	int sock_no;
	time_t time_start, cache_time = 0;
	struct badhost *badhost, *nextbadhost;

	gettimeofday(&time_now, NULL);

	/*
	 * Search for the given client in the cache.
	 */
	cached_client = NULL;
	for (i = 0; i < CLIENT_CACHE_SIZE; i++) {
		client = clnt_cache_ptr[i];
		if (!client)
			continue;
		if (clnt_cache_vers[i] != vers)
			continue;
		if (addrcmp((struct sockaddr *)&clnt_cache_addr[i], host_addr))
			continue;
		/* Found it! */
		if (((clnt_cache_time[i] + CLIENT_CACHE_LIFETIME) > time_now.tv_sec)) {
			if (config.verbose > 3)
				syslog(LOG_DEBUG, "Found CLIENT* in cache");
			return (client);
		}
		if (config.verbose)
			syslog(LOG_DEBUG, "Found expired CLIENT* in cache");
		cached_client = client;
		/* if we end up reusing this guy, make sure we keep the same timestamp */
		cache_time = clnt_cache_time[i];
		clnt_cache_time[i] = 0L;
		clnt_cache_ptr[i] = NULL;
		client = NULL;
		break;
	}

	/*
	 * Search for the given client in the badhost list.
	 */
	badhost = TAILQ_FIRST(&badhostlist_head);
	while (badhost) {
		nextbadhost = TAILQ_NEXT(badhost, list);
		if (!addrcmp(host_addr, (struct sockaddr *)&badhost->addr))
			break;
		if ((badhost->timelast + BADHOST_MAXIMUM_DELAY) < time_now.tv_sec) {
			/* cleanup entries we haven't heard from in a while */
			TAILQ_REMOVE(&badhostlist_head, badhost, list);
			free(badhost);
		}
		badhost = nextbadhost;
	}

	/*
	 * If we're getting this "CLIENT*" to send an NFS client side message to
	 * an NFS server's lockd, then limit the badhost delay to 60 seconds.
	 */
	if (badhost && client_request && ((time_now.tv_sec - badhost->timelast) >= BADHOST_NFS_CLIENT_SIDE_DELAY))
		badhost->timenext = time_now.tv_sec;
	if (badhost && (time_now.tv_sec < badhost->timenext)) {
		/*
		 * We've got a badhost, and we don't want to try
		 * consulting it again yet.  If we've got a stale
		 * cached CLIENT*, go ahead and try to use that.
		 */
		if (cached_client) {
			if (config.verbose)
				syslog(LOG_DEBUG, "badhost delayed: stale CLIENT* found in cache");
			/* Free the next entry if it is in use. */
			if (clnt_cache_ptr[clnt_cache_next_to_use]) {
				clnt_destroy(clnt_cache_ptr[clnt_cache_next_to_use]);
				clnt_cache_ptr[clnt_cache_next_to_use] = NULL;
			}
			client = cached_client;
			goto update_cache_entry;
		}
		if (config.verbose)
			syslog(LOG_DEBUG, "badhost delayed: valid CLIENT* not found in cache");
		return NULL;
	}

	if (config.verbose > 3) {
		if (!cached_client)
			syslog(LOG_DEBUG, "CLIENT* not found in cache, creating");
		else
			syslog(LOG_DEBUG, "stale CLIENT* found in cache, updating");
	}

	/* Free the next entry if it is in use. */
	if (clnt_cache_ptr[clnt_cache_next_to_use]) {
		clnt_destroy(clnt_cache_ptr[clnt_cache_next_to_use]);
		clnt_cache_ptr[clnt_cache_next_to_use] = NULL;
	}

	/* Create the new client handle                                       */
	time_start = time_now.tv_sec;

	sock_no = RPC_ANYSOCK;
	retry_time.tv_sec = 5;
	retry_time.tv_usec = 0;
	((struct sockaddr_in *)host_addr)->sin_port = 0;      /* Force consultation with portmapper   */
	client = clntudp_create((struct sockaddr_in *)host_addr, NLM_PROG, vers, retry_time, &sock_no);

	gettimeofday(&time_now, NULL);
	if (time_now.tv_sec - time_start >= BADHOST_CLIENT_TOOK_TOO_LONG) {
		/*
		 * The client create took a long time!  (slow/unresponsive portmapper?)
		 * Add/update an entry in the badhost list.
		 */
		if (!badhost && (badhost = malloc(sizeof(struct badhost)))) {
			/* allocate new badhost */
			memcpy(&badhost->addr, host_addr, host_addr->sa_len);
			badhost->count = 0;
			TAILQ_INSERT_TAIL(&badhostlist_head, badhost, list);
		}
		if (badhost) {
			/* update count and times */
			badhost->count++;
			badhost->timelast = time_now.tv_sec;
			if (client_request) {
				/* limit NFS client side badhost delay */
				badhost->timenext = time_now.tv_sec + BADHOST_NFS_CLIENT_SIDE_DELAY;
			} else if (badhost->count == 1) {
				/* first timers get a shorter initial delay */
				badhost->timenext = time_now.tv_sec + BADHOST_INITIAL_DELAY;
			} else {
				/* multiple offenders get an increasingly larger delay */
				int delay = (badhost->count - 1) * BADHOST_DELAY_INCREMENT;
				if (delay > BADHOST_MAXIMUM_DELAY)
					delay = BADHOST_MAXIMUM_DELAY;
				badhost->timenext = time_now.tv_sec + delay;
			}
			/* move to end of list */
			TAILQ_REMOVE(&badhostlist_head, badhost, list);
			TAILQ_INSERT_TAIL(&badhostlist_head, badhost, list);
		}
	} else if (badhost) {
		/* host seems good now, remove it from list */
		TAILQ_REMOVE(&badhostlist_head, badhost, list);
		free(badhost);
		badhost = NULL;
	}

	if (!client) { 
		/* We couldn't get a new CLIENT* */
		if (!cached_client) {
			syslog(LOG_WARNING, "Unable to contact %s: %s",
				inet_ntoa(((struct sockaddr_in *)host_addr)->sin_addr),
				clnt_spcreateerror("clntudp_create"));
			return NULL;
		}
		/*
		 * We couldn't get updated info from portmapper, but we did
		 * still have the stale cached data.  So we might as well try
		 * to use it.
		 */
		client = cached_client;
		syslog(LOG_WARNING, "Unable to update contact info for %s: %s",
			inet_ntoa(((struct sockaddr_in *)host_addr)->sin_addr),
			clnt_spcreateerror("clntudp_create"));
	} else {
		/*
		 * We've got a new/updated CLIENT* for this host.
		 * So, destroy any previously cached CLIENT*.
		 */
		if (cached_client)
			clnt_destroy(cached_client);

		/*
		 * Disable the default timeout, so we can specify our own in calls
		 * to clnt_call().  (Note that the timeout is a different concept
		 * from the retry period set in clnt_udp_create() above.)
		 */
		retry_time.tv_sec = -1;
		retry_time.tv_usec = -1;
		clnt_control(client, CLSET_TIMEOUT, (char *)&retry_time);

		if (config.verbose > 3)
			syslog(LOG_DEBUG, "Created CLIENT* for %s",
			    inet_ntoa(((struct sockaddr_in *)host_addr)->sin_addr));

		/* make sure the new entry gets the current timestamp */
		cache_time = time_now.tv_sec;
	}

update_cache_entry:
	/* Success (of some sort) - update the cache entry */
	clnt_cache_ptr[clnt_cache_next_to_use] = client;
	memcpy(&clnt_cache_addr[clnt_cache_next_to_use], host_addr,
	    host_addr->sa_len);
	clnt_cache_vers[clnt_cache_next_to_use] = vers;
	clnt_cache_time[clnt_cache_next_to_use] = cache_time;
	if (++clnt_cache_next_to_use >= CLIENT_CACHE_SIZE)
		clnt_cache_next_to_use = 0;

	return client;
}


/* transmit_result --------------------------------------------------------- */
/*
 * Purpose:	Transmit result for nlm_xxx_msg pseudo-RPCs
 * Returns:	success (0) or failure (-1) at sending the datagram
 * Notes:	clnt_call() will always fail (with timeout) as we are
 *		calling it with timeout 0 as a hack to just issue a datagram
 *		without expecting a result
 */
int
transmit_result(opcode, result, addr, client_request)
	int opcode;
	nlm_res *result;
	struct sockaddr *addr;
	int client_request;
{
	static char dummy;
	CLIENT *cli;
	struct timeval timeo;
	int success;

	if ((cli = get_client(addr, NLM_VERS, client_request)) != NULL) {
		timeo.tv_sec = 0; /* No timeout - not expecting response */
		timeo.tv_usec = 0;

		success = clnt_call(cli, opcode, (xdrproc_t)xdr_nlm_res, result, (xdrproc_t)xdr_void,
		    &dummy, timeo);

		if (config.verbose > 2)
			syslog(LOG_DEBUG, "clnt_call returns %d(%s)",
			    success, clnt_sperrno(success));
		return (0);
	}
	return (-1);
}
/* transmit4_result --------------------------------------------------------- */
/*
 * Purpose:	Transmit result for nlm4_xxx_msg pseudo-RPCs
 * Returns:	success (0) or failure (-1) at sending the datagram
 * Notes:	clnt_call() will always fail (with timeout) as we are
 *		calling it with timeout 0 as a hack to just issue a datagram
 *		without expecting a result
 */
int
transmit4_result(opcode, result, addr, client_request)
	int opcode;
	nlm4_res *result;
	struct sockaddr *addr;
	int client_request;
{
	static char dummy;
	CLIENT *cli;
	struct timeval timeo;
	int success;

	if ((cli = get_client(addr, NLM_VERS4, client_request)) != NULL) {
		timeo.tv_sec = 0; /* No timeout - not expecting response */
		timeo.tv_usec = 0;

		success = clnt_call(cli, opcode, (xdrproc_t)xdr_nlm4_res, result, (xdrproc_t)xdr_void,
		    &dummy, timeo);

		if (config.verbose > 2)
			syslog(LOG_DEBUG, "clnt_call returns %d(%s)",
			    success, clnt_sperrno(success));
		return (0);
	}
	return (-1);
}

/*
 * converts a struct nlm_lock to struct nlm4_lock
 */
static void nlmtonlm4(struct nlm_lock *, struct nlm4_lock *);
static void
nlmtonlm4(arg, arg4)
	struct nlm_lock *arg;
	struct nlm4_lock *arg4;
{
	arg4->caller_name = arg->caller_name;
	arg4->fh = arg->fh;
	arg4->oh = arg->oh;
	arg4->svid = arg->svid;
	arg4->l_offset = arg->l_offset;
	arg4->l_len = arg->l_len;
}
/* ------------------------------------------------------------------------- */
/*
 * Functions for Unix<->Unix locking (ie. monitored locking, with rpc.statd
 * involved to ensure reclaim of locks after a crash of the "stateless"
 * server.
 *
 * These all come in two flavours - nlm_xxx() and nlm_xxx_msg().
 * The first are standard RPCs with argument and result.
 * The nlm_xxx_msg() calls implement exactly the same functions, but
 * use two pseudo-RPCs (one in each direction).  These calls are NOT
 * standard use of the RPC protocol in that they do not return a result
 * at all (NB. this is quite different from returning a void result).
 * The effect of this is to make the nlm_xxx_msg() calls simple unacknowledged
 * datagrams, requiring higher-level code to perform retries.
 *
 * Despite the disadvantages of the nlm_xxx_msg() approach (some of which
 * are documented in the comments to get_client() above), this is the
 * interface used by all current commercial NFS implementations
 * [Solaris, SCO, AIX etc.].  This is presumed to be because these allow
 * implementations to continue using the standard RPC libraries, while
 * avoiding the block-until-result nature of the library interface.
 *
 * No client implementations have been identified so far that make use
 * of the true RPC version (early SunOS releases would be a likely candidate
 * for testing).
 */

/* nlm_test ---------------------------------------------------------------- */
/*
 * Purpose:	Test whether a specified lock would be granted if requested
 * Returns:	nlm_granted (or error code)
 * Notes:
 */
nlm_testres *
nlm_test_1_svc(arg, rqstp)
	nlm_testargs *arg;
	struct svc_req *rqstp;
{
	static nlm_testres res;
	struct nlm4_lock arg4;
	struct nlm4_holder *holder;
	nlmtonlm4(&arg->alock, &arg4);

	if (config.verbose)
		log_from_addr("nlm_test", rqstp);

	holder = testlock(&arg4, arg->exclusive, 0);
	/*
	 * Copy the cookie from the argument into the result.  Note that this
	 * is slightly hazardous, as the structure contains a pointer to a
	 * malloc()ed buffer that will get freed by the caller.  However, the
	 * main function transmits the result before freeing the argument
	 * so it is in fact safe.
	 */
	res.cookie = arg->cookie;
	if (holder == NULL) {
		res.stat.stat = nlm_granted;
	} else {
		res.stat.stat = nlm_denied;
		memcpy(&res.stat.nlm_testrply_u.holder, holder,
		    sizeof(struct nlm_holder));
		res.stat.nlm_testrply_u.holder.l_offset = holder->l_offset;
		res.stat.nlm_testrply_u.holder.l_len = holder->l_len;
	}
	return (&res);
}

void *
nlm_test_msg_1_svc(arg, rqstp)
	nlm_testargs *arg;
	struct svc_req *rqstp;
{
	nlm_testres res;
	static char dummy;
	struct sockaddr *addr;
	CLIENT *cli;
	int success;
	struct timeval timeo;
	struct nlm4_lock arg4;
	struct nlm4_holder *holder;

	nlmtonlm4(&arg->alock, &arg4);

	if (config.verbose)
		log_from_addr("nlm_test_msg", rqstp);

	holder = testlock(&arg4, arg->exclusive, 0);

	res.cookie = arg->cookie;
	if (holder == NULL) {
		res.stat.stat = nlm_granted;
	} else {
		res.stat.stat = nlm_denied;
		memcpy(&res.stat.nlm_testrply_u.holder, holder,
		    sizeof(struct nlm_holder));
		res.stat.nlm_testrply_u.holder.l_offset = holder->l_offset;
		res.stat.nlm_testrply_u.holder.l_len = holder->l_len;
	}

	/*
	 * nlm_test has different result type to the other operations, so
	 * can't use transmit_result() in this case
	 */
	addr = (struct sockaddr *)svc_getcaller(rqstp->rq_xprt);
	if ((cli = get_client(addr, NLM_VERS, 0)) != NULL) {
		timeo.tv_sec = 0; /* No timeout - not expecting response */
		timeo.tv_usec = 0;

		success = clnt_call(cli, NLM_TEST_RES, (xdrproc_t)xdr_nlm_testres,
		    &res, (xdrproc_t)xdr_void, &dummy, timeo);

		if (config.verbose > 2)
			syslog(LOG_DEBUG, "clnt_call returns %d", success);
	}
	return (NULL);
}

/* nlm_lock ---------------------------------------------------------------- */
/*
 * Purposes:	Establish a lock
 * Returns:	granted, denied or blocked
 * Notes:	*** grace period support missing
 */
nlm_res *
nlm_lock_1_svc(arg, rqstp)
	nlm_lockargs *arg;
	struct svc_req *rqstp;
{
	static nlm_res res;
	struct nlm4_lockargs arg4;
	nlmtonlm4(&arg->alock, &arg4.alock);
	arg4.cookie = arg->cookie;
	arg4.block = arg->block;
	arg4.exclusive = arg->exclusive;
	arg4.reclaim = arg->reclaim;
	arg4.state = arg->state;

	if (config.verbose)
		log_from_addr("nlm_lock", rqstp);

	/* copy cookie from arg to result.  See comment in nlm_test_1() */
	res.cookie = arg->cookie;

	res.stat.stat = getlock(&arg4, rqstp, LOCK_MON);
	return (&res);
}

void *
nlm_lock_msg_1_svc(arg, rqstp)
	nlm_lockargs *arg;
	struct svc_req *rqstp;
{
	static nlm_res res;
	struct nlm4_lockargs arg4;

	nlmtonlm4(&arg->alock, &arg4.alock);
	arg4.cookie = arg->cookie;
	arg4.block = arg->block;
	arg4.exclusive = arg->exclusive;
	arg4.reclaim = arg->reclaim;
	arg4.state = arg->state;

	if (config.verbose)
		log_from_addr("nlm_lock_msg", rqstp);

	res.cookie = arg->cookie;
	res.stat.stat = getlock(&arg4, rqstp, LOCK_ASYNC | LOCK_MON);
	if (transmit_result(NLM_LOCK_RES, &res,
	    (struct sockaddr *)svc_getcaller(rqstp->rq_xprt), 0) < 0) {
		/* if res.stat.stat was success/blocked, then unlock/cancel */
		if (res.stat.stat == nlm_granted)
			unlock(&arg4.alock, LOCK_V4);
		else if (res.stat.stat == nlm_blocked) {
			nlm4_cancargs carg;
			carg.cookie = arg4.cookie;
			carg.block = arg4.block;
			carg.exclusive = arg4.exclusive;
			carg.alock = arg4.alock;
			cancellock(&carg, 0);
		}
	}

	return (NULL);
}

/* nlm_cancel -------------------------------------------------------------- */
/*
 * Purpose:	Cancel a blocked lock request
 * Returns:	granted or denied
 * Notes:
 */
nlm_res *
nlm_cancel_1_svc(arg, rqstp)
	nlm_cancargs *arg;
	struct svc_req *rqstp;
{
	static nlm_res res;
	struct nlm4_cancargs arg4;

	arg4.cookie = arg->cookie;
	arg4.block = arg->block;
	arg4.exclusive = arg->exclusive;
	nlmtonlm4(&arg->alock, &arg4.alock);

	if (config.verbose)
		log_from_addr("nlm_cancel", rqstp);

	/* copy cookie from arg to result.  See comment in nlm_test_1() */
	res.cookie = arg->cookie;

	res.stat.stat = cancellock(&arg4, 0);
	return (&res);
}

void *
nlm_cancel_msg_1_svc(arg, rqstp)
	nlm_cancargs *arg;
	struct svc_req *rqstp;
{
	static nlm_res res;
	struct nlm4_cancargs arg4;

	arg4.cookie = arg->cookie;
	arg4.block = arg->block;
	arg4.exclusive = arg->exclusive;
	nlmtonlm4(&arg->alock, &arg4.alock);

	if (config.verbose)
		log_from_addr("nlm_cancel_msg", rqstp);

	res.cookie = arg->cookie;
	res.stat.stat = cancellock(&arg4, 0);
	if (transmit_result(NLM_CANCEL_RES, &res,
	    (struct sockaddr *)svc_getcaller(rqstp->rq_xprt), 0) < 0) {
		/* XXX do we need to (un)do anything if this fails? */
	}
	return (NULL);
}

/* nlm_unlock -------------------------------------------------------------- */
/*
 * Purpose:	Release an existing lock
 * Returns:	Always granted, unless during grace period
 * Notes:	"no such lock" error condition is ignored, as the
 *		protocol uses unreliable UDP datagrams, and may well
 *		re-try an unlock that has already succeeded.
 */
nlm_res *
nlm_unlock_1_svc(arg, rqstp)
	nlm_unlockargs *arg;
	struct svc_req *rqstp;
{
	static nlm_res res;
	struct nlm4_lock arg4;

	nlmtonlm4(&arg->alock, &arg4);

	if (config.verbose)
		log_from_addr("nlm_unlock", rqstp);

	res.stat.stat = unlock(&arg4, 0);
	res.cookie = arg->cookie;

	return (&res);
}

void *
nlm_unlock_msg_1_svc(arg, rqstp)
	nlm_unlockargs *arg;
	struct svc_req *rqstp;
{
	static nlm_res res;
	struct nlm4_lock arg4;

	nlmtonlm4(&arg->alock, &arg4);

	if (config.verbose)
		log_from_addr("nlm_unlock_msg", rqstp);

	res.stat.stat = unlock(&arg4, 0);
	res.cookie = arg->cookie;

	if (transmit_result(NLM_UNLOCK_RES, &res,
	    (struct sockaddr *)svc_getcaller(rqstp->rq_xprt), 0) < 0) {
		/* XXX do we need to (un)do anything if this fails? */
	}
	return (NULL);
}

/* ------------------------------------------------------------------------- */
/*
 * Client-side pseudo-RPCs for results.  Note that for the client there
 * are only nlm_xxx_msg() versions of each call, since the 'real RPC'
 * version returns the results in the RPC result, and so the client
 * does not normally receive incoming RPCs.
 *
 * The exception to this is nlm_granted(), which is genuinely an RPC
 * call from the server to the client - a 'call-back' in normal procedure
 * call terms.
 */

/* nlm_granted ------------------------------------------------------------- */
/*
 * Purpose:	Receive notification that formerly blocked lock now granted
 * Returns:	always success ('granted')
 * Notes:
 */
nlm_res *
nlm_granted_1_svc(arg, rqstp)
	nlm_testargs *arg;
	struct svc_req *rqstp;
{
	static nlm_res res;
	nlm4_lock lock4;
	int flags;

	if (config.verbose)
		log_from_addr("nlm_granted", rqstp);

	lock4.fh = arg->alock.fh;
	lock4.svid = arg->alock.svid;
	lock4.l_offset = arg->alock.l_offset;
	lock4.l_len = arg->alock.l_len;

	flags = LOCK_ANSWER_GRANTED;
	if (arg->exclusive)
		flags |= LOCK_ANSWER_LOCK_EXCL;

	if (lock_answer(NLM_VERS, &arg->cookie, &lock4, flags, nlm_granted))
		res.stat.stat = nlm_denied;
	else
		res.stat.stat = nlm_granted;

	/* copy cookie from arg to result.  See comment in nlm_test_1() */
	res.cookie = arg->cookie;

	return (&res);
}

void *
nlm_granted_msg_1_svc(arg, rqstp)
	nlm_testargs *arg;
	struct svc_req *rqstp;
{
	static nlm_res res;
	nlm4_lock lock4;
	int flags;

	if (config.verbose)
		log_from_addr("nlm_granted_msg", rqstp);

	lock4.fh = arg->alock.fh;
	lock4.svid = arg->alock.svid;
	lock4.l_offset = arg->alock.l_offset;
	lock4.l_len = arg->alock.l_len;

	flags = LOCK_ANSWER_GRANTED;
	if (arg->exclusive)
		flags |= LOCK_ANSWER_LOCK_EXCL;

	if (lock_answer(NLM_VERS, &arg->cookie, &lock4, flags, nlm_granted))
		res.stat.stat = nlm_denied;
	else
		res.stat.stat = nlm_granted;

	res.cookie = arg->cookie;

	if (transmit_result(NLM_GRANTED_RES, &res,
	    (struct sockaddr *)svc_getcaller(rqstp->rq_xprt), 1) < 0) {
		/* XXX do we need to (un)do anything if this fails? */
	}
	return (NULL);
}

/* nlm_test_res ------------------------------------------------------------ */
/*
 * Purpose:	Accept result from earlier nlm_test_msg() call
 * Returns:	Nothing
 */
void *
nlm_test_res_1_svc(arg, rqstp)
	nlm_testres *arg;
	struct svc_req *rqstp;
{
	nlm4_lock lock4;
	int flags = 0;

	if (config.verbose)
		log_from_addr("nlm_test_res", rqstp);

	if (arg->stat.stat == nlm_denied) {
		lock4.fh.n_len = 0;
		lock4.svid = arg->stat.nlm_testrply_u.holder.svid;
		lock4.l_offset = arg->stat.nlm_testrply_u.holder.l_offset;
		lock4.l_len = arg->stat.nlm_testrply_u.holder.l_len;
		if (arg->stat.nlm_testrply_u.holder.exclusive)
			flags |= LOCK_ANSWER_LOCK_EXCL;
		lock_answer(NLM_VERS, &arg->cookie, &lock4, flags, arg->stat.stat);
	} else
		lock_answer(NLM_VERS, &arg->cookie, NULL, 0, arg->stat.stat);

	return (NULL);
}

/* nlm_lock_res ------------------------------------------------------------ */
/*
 * Purpose:	Accept result from earlier nlm_lock_msg() call
 * Returns:	Nothing
 */
void *
nlm_lock_res_1_svc(arg, rqstp)
	nlm_res *arg;
	struct svc_req *rqstp;
{
	if (config.verbose)
		log_from_addr("nlm_lock_res", rqstp);

	lock_answer(NLM_VERS, &arg->cookie, NULL, 0, arg->stat.stat);

	return (NULL);
}

/* nlm_cancel_res ---------------------------------------------------------- */
/*
 * Purpose:	Accept result from earlier nlm_cancel_msg() call
 * Returns:	Nothing
 */
void *
nlm_cancel_res_1_svc(arg, rqstp)
	nlm_res *arg;
	struct svc_req *rqstp;
{
	if (config.verbose)
		log_from_addr("nlm_cancel_res", rqstp);

	lock_answer(NLM_VERS, &arg->cookie, NULL, 0, arg->stat.stat);

	return (NULL);
}

/* nlm_unlock_res ---------------------------------------------------------- */
/*
 * Purpose:	Accept result from earlier nlm_unlock_msg() call
 * Returns:	Nothing
 */
void *
nlm_unlock_res_1_svc(arg, rqstp)
	nlm_res *arg;
	struct svc_req *rqstp;
{
	if (config.verbose)
		log_from_addr("nlm_unlock_res", rqstp);

	lock_answer(NLM_VERS, &arg->cookie, NULL, 0, arg->stat.stat);

	return (NULL);
}

/* nlm_granted_res --------------------------------------------------------- */
/*
 * Purpose:	Accept result from earlier nlm_granted_msg() call
 * Returns:	Nothing
 */
void *
nlm_granted_res_1_svc(arg, rqstp)
	nlm_res *arg;
	struct svc_req *rqstp;
{
	if (config.verbose)
		log_from_addr("nlm_granted_res", rqstp);
	/* need to undo lock if granted msg wasn't accepted! */
	if (arg->stat.stat != nlm_granted) {
		nlm4_res arg4;
		arg4.cookie = arg->cookie;
		arg4.stat.stat = arg->stat.stat;
		granted_failed(&arg4);
	}
	return (NULL);
}

/* ------------------------------------------------------------------------- */
/*
 * Calls for PCNFS locking (aka non-monitored locking, no involvement
 * of rpc.statd).
 *
 * These are all genuine RPCs - no nlm_xxx_msg() nonsense here.
 */

/* nlm_share --------------------------------------------------------------- */
/*
 * Purpose:	Establish a DOS-style lock
 * Returns:	success or failure
 * Notes:	Blocking locks are not supported - client is expected
 *		to retry if required.
 */
nlm_shareres *
nlm_share_3_svc(arg, rqstp)
	nlm_shareargs *arg;
	struct svc_req *rqstp;
{
	static nlm_shareres res;

	if (config.verbose)
		log_from_addr("nlm_share", rqstp);

	/* copy cookie from arg to result.  See comment in nlm_test_1() */
	res.cookie = arg->cookie;
	res.sequence = 0;	/* X/Open says this field is ignored? */

	res.stat = getshare(arg, rqstp, 0);
	return (&res);
}

/* nlm_unshare ------------------------------------------------------------ */
/*
 * Purpose:	Release a DOS-style lock
 * Returns:	nlm_granted, unless in grace period
 * Notes:
 */
nlm_shareres *
nlm_unshare_3_svc(arg, rqstp)
	nlm_shareargs *arg;
	struct svc_req *rqstp;
{
	static nlm_shareres res;

	if (config.verbose)
		log_from_addr("nlm_unshare", rqstp);

	res.cookie = arg->cookie;
	res.sequence = 0;	/* X/Open says this field is ignored? */

	res.stat = unshare(arg, rqstp, 0);
	return (&res);
}

/* nlm_nm_lock ------------------------------------------------------------ */
/*
 * Purpose:	non-monitored version of nlm_lock()
 * Returns:	as for nlm_lock()
 * Notes:	These locks are in the same style as the standard nlm_lock,
 *		but the rpc.statd should not be called to establish a
 *		monitor for the client machine, since that machine is
 *		declared not to be running a rpc.statd, and so would not
 *		respond to the statd protocol.
 */
nlm_res *
nlm_nm_lock_3_svc(arg, rqstp)
	nlm_lockargs *arg;
	struct svc_req *rqstp;
{
	static nlm_res res;
	struct nlm4_lockargs arg4;
	nlmtonlm4(&arg->alock, &arg4.alock);
	arg4.cookie = arg->cookie;
	arg4.block = arg->block;
	arg4.exclusive = arg->exclusive;
	arg4.reclaim = arg->reclaim;
	arg4.state = arg->state;

	if (config.verbose)
		log_from_addr("nlm_nm_lock", rqstp);

	/* copy cookie from arg to result.  See comment in nlm_test_1() */
	res.cookie = arg->cookie;

	res.stat.stat = getlock(&arg4, rqstp, 0);
	return (&res);
}

/* nlm_free_all ------------------------------------------------------------ */
/*
 * Purpose:	Release all locks held by a named client
 * Returns:	Nothing
 * Notes:	Potential denial of service security problem here - the
 *		locks to be released are specified by a host name, independent
 *		of the address from which the request has arrived.
 *		Should probably be rejected if the named host has been
 *		using monitored locks.
 */
void *
nlm_free_all_3_svc(arg, rqstp)
	nlm_notify *arg;
	struct svc_req *rqstp;
{
	static char dummy;

	if (config.verbose)
		log_from_addr("nlm_free_all", rqstp);

	/* free all non-monitored locks/shares for specified host */
	do_free_all(arg->name);

	return (&dummy);
}

/* calls for nlm version 4 (NFSv3) */
/* nlm_test ---------------------------------------------------------------- */
/*
 * Purpose:	Test whether a specified lock would be granted if requested
 * Returns:	nlm_granted (or error code)
 * Notes:
 */
nlm4_testres *
nlm4_test_4_svc(arg, rqstp)
	nlm4_testargs *arg;
	struct svc_req *rqstp;
{
	static nlm4_testres res;
	struct nlm4_holder *holder;

	if (config.verbose)
		log_from_addr("nlm4_test", rqstp);
	if (config.verbose > 5) {
		syslog(LOG_DEBUG, "Locking arguments:\n");
		log_netobj(&(arg->cookie));
		syslog(LOG_DEBUG, "Alock arguments:\n");
		syslog(LOG_DEBUG, "Caller Name: %s\n",arg->alock.caller_name);
		syslog(LOG_DEBUG, "File Handle:\n");
		log_netobj(&(arg->alock.fh));
		syslog(LOG_DEBUG, "Owner Handle:\n");
		log_netobj(&(arg->alock.oh));
		syslog(LOG_DEBUG, "SVID:        %d\n", arg->alock.svid);
		syslog(LOG_DEBUG, "Lock Offset: %llu\n",
		    (unsigned long long)arg->alock.l_offset);
		syslog(LOG_DEBUG, "Lock Length: %llu\n",
		    (unsigned long long)arg->alock.l_len);
		syslog(LOG_DEBUG, "Exclusive:   %s\n",
		    (arg->exclusive ? "true" : "false"));
	}

	holder = testlock(&arg->alock, arg->exclusive, LOCK_V4);

	/*
	 * Copy the cookie from the argument into the result.  Note that this
	 * is slightly hazardous, as the structure contains a pointer to a
	 * malloc()ed buffer that will get freed by the caller.  However, the
	 * main function transmits the result before freeing the argument
	 * so it is in fact safe.
	 */
	res.cookie = arg->cookie;
	if (holder == NULL) {
		res.stat.stat = nlm4_granted;
	} else {
		res.stat.stat = nlm4_denied;
		memcpy(&res.stat.nlm4_testrply_u.holder, holder,
		    sizeof(struct nlm4_holder));
	}
	return (&res);
}

void *
nlm4_test_msg_4_svc(arg, rqstp)
	nlm4_testargs *arg;
	struct svc_req *rqstp;
{
	nlm4_testres res;
	static char dummy;
	struct sockaddr *addr;
	CLIENT *cli;
	int success;
	struct timeval timeo;
	struct nlm4_holder *holder;

	if (config.verbose)
		log_from_addr("nlm4_test_msg", rqstp);

	holder = testlock(&arg->alock, arg->exclusive, LOCK_V4);

	res.cookie = arg->cookie;
	if (holder == NULL) {
		res.stat.stat = nlm4_granted;
	} else {
		res.stat.stat = nlm4_denied;
		memcpy(&res.stat.nlm4_testrply_u.holder, holder,
		    sizeof(struct nlm4_holder));
	}

	/*
	 * nlm_test has different result type to the other operations, so
	 * can't use transmit4_result() in this case
	 */
	addr = (struct sockaddr *)svc_getcaller(rqstp->rq_xprt);
	if ((cli = get_client(addr, NLM_VERS4, 0)) != NULL) {
		timeo.tv_sec = 0; /* No timeout - not expecting response */
		timeo.tv_usec = 0;

		success = clnt_call(cli, NLM4_TEST_RES, (xdrproc_t)xdr_nlm4_testres,
		    &res, (xdrproc_t)xdr_void, &dummy, timeo);

		if (config.verbose > 2)
			syslog(LOG_DEBUG, "clnt_call returns %d", success);
	}
	return (NULL);
}

/* nlm_lock ---------------------------------------------------------------- */
/*
 * Purposes:	Establish a lock
 * Returns:	granted, denied or blocked
 * Notes:	*** grace period support missing
 */
nlm4_res *
nlm4_lock_4_svc(arg, rqstp)
	nlm4_lockargs *arg;
	struct svc_req *rqstp;
{
	static nlm4_res res;

	if (config.verbose)
		log_from_addr("nlm4_lock", rqstp);
	if (config.verbose > 5) {
		syslog(LOG_DEBUG, "Locking arguments:\n");
		log_netobj(&(arg->cookie));
		syslog(LOG_DEBUG, "Alock arguments:\n");
		syslog(LOG_DEBUG, "Caller Name: %s\n",arg->alock.caller_name);
		syslog(LOG_DEBUG, "File Handle:\n");
		log_netobj(&(arg->alock.fh));
		syslog(LOG_DEBUG, "Owner Handle:\n");
		log_netobj(&(arg->alock.oh));
		syslog(LOG_DEBUG, "SVID:        %d\n", arg->alock.svid);
		syslog(LOG_DEBUG, "Lock Offset: %llu\n",
		    (unsigned long long)arg->alock.l_offset);
		syslog(LOG_DEBUG, "Lock Length: %llu\n", 
		    (unsigned long long)arg->alock.l_len);
		syslog(LOG_DEBUG, "Block:       %s\n", (arg->block ? "true" : "false"));
		syslog(LOG_DEBUG, "Exclusive:   %s\n", (arg->exclusive ? "true" : "false"));
		syslog(LOG_DEBUG, "Reclaim:     %s\n", (arg->reclaim ? "true" : "false"));
		syslog(LOG_DEBUG, "State num:   %d\n", arg->state);
	}

	/* copy cookie from arg to result.  See comment in nlm_test_4() */
	res.cookie = arg->cookie;

	res.stat.stat = getlock(arg, rqstp, LOCK_MON | LOCK_V4);
	return (&res);
}

void *
nlm4_lock_msg_4_svc(arg, rqstp)
	nlm4_lockargs *arg;
	struct svc_req *rqstp;
{
	static nlm4_res res;

	if (config.verbose)
		log_from_addr("nlm4_lock_msg", rqstp);

	res.cookie = arg->cookie;
	res.stat.stat = getlock(arg, rqstp, LOCK_MON | LOCK_ASYNC | LOCK_V4);
	if (transmit4_result(NLM4_LOCK_RES, &res,
	    (struct sockaddr *)svc_getcaller(rqstp->rq_xprt), 0) < 0) {
		/* if res.stat.stat was success/blocked, then unlock/cancel */
		if (res.stat.stat == nlm4_granted)
			unlock(&arg->alock, LOCK_V4);
		else if (res.stat.stat == nlm4_blocked) {
			nlm4_cancargs carg;
			carg.cookie = arg->cookie;
			carg.block = arg->block;
			carg.exclusive = arg->exclusive;
			carg.alock = arg->alock;
			cancellock(&carg, LOCK_V4);
		}
	}

	return (NULL);
}

/* nlm_cancel -------------------------------------------------------------- */
/*
 * Purpose:	Cancel a blocked lock request
 * Returns:	granted or denied
 * Notes:
 */
nlm4_res *
nlm4_cancel_4_svc(arg, rqstp)
	nlm4_cancargs *arg;
	struct svc_req *rqstp;
{
	static nlm4_res res;

	if (config.verbose)
		log_from_addr("nlm4_cancel", rqstp);

	/* copy cookie from arg to result.  See comment in nlm_test_1() */
	res.cookie = arg->cookie;

	res.stat.stat = cancellock(arg, LOCK_V4);
	return (&res);
}

void *
nlm4_cancel_msg_4_svc(arg, rqstp)
	nlm4_cancargs *arg;
	struct svc_req *rqstp;
{
	static nlm4_res res;

	if (config.verbose)
		log_from_addr("nlm4_cancel_msg", rqstp);

	res.cookie = arg->cookie;
	res.stat.stat = cancellock(arg, LOCK_V4);
	if (transmit4_result(NLM4_CANCEL_RES, &res,
	    (struct sockaddr *)svc_getcaller(rqstp->rq_xprt), 0) < 0) {
		/* XXX do we need to (un)do anything if this fails? */
	}
	return (NULL);
}

/* nlm_unlock -------------------------------------------------------------- */
/*
 * Purpose:	Release an existing lock
 * Returns:	Always granted, unless during grace period
 * Notes:	"no such lock" error condition is ignored, as the
 *		protocol uses unreliable UDP datagrams, and may well
 *		re-try an unlock that has already succeeded.
 */
nlm4_res *
nlm4_unlock_4_svc(arg, rqstp)
	nlm4_unlockargs *arg;
	struct svc_req *rqstp;
{
	static nlm4_res res;

	if (config.verbose)
		log_from_addr("nlm4_unlock", rqstp);

	res.stat.stat = unlock(&arg->alock, LOCK_V4);
	res.cookie = arg->cookie;

	return (&res);
}

void *
nlm4_unlock_msg_4_svc(arg, rqstp)
	nlm4_unlockargs *arg;
	struct svc_req *rqstp;
{
	static nlm4_res res;

	if (config.verbose)
		log_from_addr("nlm4_unlock_msg", rqstp);

	res.stat.stat = unlock(&arg->alock, LOCK_V4);
	res.cookie = arg->cookie;

	if (transmit4_result(NLM4_UNLOCK_RES, &res,
	    (struct sockaddr *)svc_getcaller(rqstp->rq_xprt), 0) < 0) {
		/* XXX do we need to (un)do anything if this fails? */
	}
	return (NULL);
}

/* ------------------------------------------------------------------------- */
/*
 * Client-side pseudo-RPCs for results.  Note that for the client there
 * are only nlm_xxx_msg() versions of each call, since the 'real RPC'
 * version returns the results in the RPC result, and so the client
 * does not normally receive incoming RPCs.
 *
 * The exception to this is nlm_granted(), which is genuinely an RPC
 * call from the server to the client - a 'call-back' in normal procedure
 * call terms.
 */

/* nlm_granted ------------------------------------------------------------- */
/*
 * Purpose:	Receive notification that formerly blocked lock now granted
 * Returns:	always success ('granted')
 * Notes:
 */
nlm4_res *
nlm4_granted_4_svc(arg, rqstp)
	nlm4_testargs *arg;
	struct svc_req *rqstp;
{
	static nlm4_res res;
	int flags;

	if (config.verbose)
		log_from_addr("nlm4_granted", rqstp);

	flags = LOCK_ANSWER_GRANTED;
	if (arg->exclusive)
		flags |= LOCK_ANSWER_LOCK_EXCL;

	if (lock_answer(NLM_VERS4, &arg->cookie, &arg->alock, flags, nlm4_granted))
		res.stat.stat = nlm4_denied;
	else
		res.stat.stat = nlm4_granted;

	/* copy cookie from arg to result.  See comment in nlm_test_1() */
	res.cookie = arg->cookie;

	return (&res);
}

void *
nlm4_granted_msg_4_svc(arg, rqstp)
	nlm4_testargs *arg;
	struct svc_req *rqstp;
{
	static nlm4_res res;
	int flags;

	if (config.verbose)
		log_from_addr("nlm4_granted_msg", rqstp);

	flags = LOCK_ANSWER_GRANTED;
	if (arg->exclusive)
		flags |= LOCK_ANSWER_LOCK_EXCL;

	if (lock_answer(NLM_VERS4, &arg->cookie, &arg->alock, flags, nlm4_granted))
		res.stat.stat = nlm4_denied;
	else
		res.stat.stat = nlm4_granted;

	res.cookie = arg->cookie;

	if (transmit4_result(NLM4_GRANTED_RES, &res,
	    (struct sockaddr *)svc_getcaller(rqstp->rq_xprt), 1) < 0) {
		/* XXX do we need to (un)do anything if this fails? */
	}
	return (NULL);
}

/* nlm_test_res ------------------------------------------------------------ */
/*
 * Purpose:	Accept result from earlier nlm_test_msg() call
 * Returns:	Nothing
 */
void *
nlm4_test_res_4_svc(arg, rqstp)
	nlm4_testres *arg;
	struct svc_req *rqstp;
{
	nlm4_lock lock4;
	int flags = 0;

	if (config.verbose)
		log_from_addr("nlm4_test_res", rqstp);

	if (arg->stat.stat == nlm4_denied) {
		lock4.fh.n_len = 0;
		lock4.svid = arg->stat.nlm4_testrply_u.holder.svid;
		lock4.l_offset = arg->stat.nlm4_testrply_u.holder.l_offset;
		lock4.l_len = arg->stat.nlm4_testrply_u.holder.l_len;
		if (arg->stat.nlm4_testrply_u.holder.exclusive)
			flags |= LOCK_ANSWER_LOCK_EXCL;
		lock_answer(NLM_VERS4, &arg->cookie, &lock4, flags, arg->stat.stat);
	} else
		lock_answer(NLM_VERS4, &arg->cookie, NULL, 0, arg->stat.stat);

	return (NULL);
}

/* nlm_lock_res ------------------------------------------------------------ */
/*
 * Purpose:	Accept result from earlier nlm_lock_msg() call
 * Returns:	Nothing
 */
void *
nlm4_lock_res_4_svc(arg, rqstp)
	nlm4_res *arg;
	struct svc_req *rqstp;
{
	if (config.verbose)
		log_from_addr("nlm4_lock_res", rqstp);

	lock_answer(NLM_VERS4, &arg->cookie, NULL, 0, arg->stat.stat);

	return (NULL);
}

/* nlm_cancel_res ---------------------------------------------------------- */
/*
 * Purpose:	Accept result from earlier nlm_cancel_msg() call
 * Returns:	Nothing
 */
void *
nlm4_cancel_res_4_svc(arg, rqstp)
	nlm4_res *arg;
	struct svc_req *rqstp;
{
	if (config.verbose)
		log_from_addr("nlm4_cancel_res", rqstp);

	lock_answer(NLM_VERS4, &arg->cookie, NULL, 0, arg->stat.stat);

	return (NULL);
}

/* nlm_unlock_res ---------------------------------------------------------- */
/*
 * Purpose:	Accept result from earlier nlm_unlock_msg() call
 * Returns:	Nothing
 */
void *
nlm4_unlock_res_4_svc(arg, rqstp)
	nlm4_res *arg __unused;
	struct svc_req *rqstp;
{
	if (config.verbose)
		log_from_addr("nlm4_unlock_res", rqstp);

	lock_answer(NLM_VERS4, &arg->cookie, NULL, 0, arg->stat.stat);

	return (NULL);
}

/* nlm_granted_res --------------------------------------------------------- */
/*
 * Purpose:	Accept result from earlier nlm_granted_msg() call
 * Returns:	Nothing
 */
void *
nlm4_granted_res_4_svc(arg, rqstp)
	nlm4_res *arg __unused;
	struct svc_req *rqstp;
{
	if (config.verbose)
		log_from_addr("nlm4_granted_res", rqstp);
	/* need to undo lock if granted msg wasn't accepted! */
	if (arg->stat.stat != nlm4_granted)
		granted_failed(arg);
	return (NULL);
}

/* ------------------------------------------------------------------------- */
/*
 * Calls for PCNFS locking (aka non-monitored locking, no involvement
 * of rpc.statd).
 *
 * These are all genuine RPCs - no nlm_xxx_msg() nonsense here.
 */

/* nlm_share --------------------------------------------------------------- */
/*
 * Purpose:	Establish a DOS-style lock
 * Returns:	success or failure
 * Notes:	Blocking locks are not supported - client is expected
 *		to retry if required.
 */
nlm4_shareres *
nlm4_share_4_svc(arg, rqstp)
	nlm4_shareargs *arg;
	struct svc_req *rqstp;
{
	static nlm4_shareres res;

	if (config.verbose)
		log_from_addr("nlm4_share", rqstp);

	res.cookie = arg->cookie;
	res.sequence = 0;	/* X/Open says this field is ignored? */

	res.stat = getshare((nlm_shareargs*)arg, rqstp, LOCK_V4);
	return (&res);
}

/* nlm4_unshare ------------------------------------------------------------ */
/*
 * Purpose:	Release a DOS-style lock
 * Returns:	nlm_granted, unless in grace period
 * Notes:
 */
nlm4_shareres *
nlm4_unshare_4_svc(arg, rqstp)
	nlm4_shareargs *arg;
	struct svc_req *rqstp;
{
	static nlm4_shareres res;

	if (config.verbose)
		log_from_addr("nlm4_unshare", rqstp);

	res.cookie = arg->cookie;
	res.sequence = 0;	/* X/Open says this field is ignored? */

	res.stat = unshare((nlm_shareargs*)arg, rqstp, LOCK_V4);
	return (&res);
}

/* nlm4_nm_lock ------------------------------------------------------------ */
/*
 * Purpose:	non-monitored version of nlm4_lock()
 * Returns:	as for nlm4_lock()
 * Notes:	These locks are in the same style as the standard nlm4_lock,
 *		but the rpc.statd should not be called to establish a
 *		monitor for the client machine, since that machine is
 *		declared not to be running a rpc.statd, and so would not
 *		respond to the statd protocol.
 */
nlm4_res *
nlm4_nm_lock_4_svc(arg, rqstp)
	nlm4_lockargs *arg;
	struct svc_req *rqstp;
{
	static nlm4_res res;

	if (config.verbose)
		log_from_addr("nlm4_nm_lock", rqstp);

	/* copy cookie from arg to result.  See comment in nlm_test_4() */
	res.cookie = arg->cookie;

	res.stat.stat = getlock(arg, rqstp, LOCK_V4);
	return (&res);
}

/* nlm4_free_all ------------------------------------------------------------ */
/*
 * Purpose:	Release all locks held by a named client
 * Returns:	Nothing
 * Notes:	Potential denial of service security problem here - the
 *		locks to be released are specified by a host name, independent
 *		of the address from which the request has arrived.
 *		Should probably be rejected if the named host has been
 *		using monitored locks.
 */
void *
nlm4_free_all_4_svc(arg, rqstp)
	struct nlm4_notify *arg;
	struct svc_req *rqstp;
{
	static char dummy;

	if (config.verbose)
		log_from_addr("nlm4_free_all", rqstp);

	/* free all non-monitored locks/shares for specified host */
	do_free_all(arg->name);

	return (&dummy);
}

/* nlm_sm_notify --------------------------------------------------------- */
/*
 * Purpose:	called by rpc.statd when a monitored host state changes.
 * Returns:	Nothing
 */
void *
nlm_sm_notify_0_svc(arg, rqstp)
	struct nlm_sm_status *arg;
	struct svc_req *rqstp __unused;
{
	static char dummy;
	notify(arg->mon_name, arg->state);
	return (&dummy);
}