1295 lines
34 KiB
C
1295 lines
34 KiB
C
/* $NetBSD: lock_proc.c,v 1.7 2000/10/11 20:23:56 is Exp $ */
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/*
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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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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: lock_proc.c,v 1.7 2000/10/11 20:23:56 is Exp $");
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#endif
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <netconfig.h>
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#include <rpc/rpc.h>
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#include <rpcsvc/sm_inter.h>
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#include "lockd.h"
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#include <rpcsvc/nlm_prot.h>
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#include "lockd_lock.h"
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#define CLIENT_CACHE_SIZE 64 /* No. of client sockets cached */
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#define CLIENT_CACHE_LIFETIME 120 /* In seconds */
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static void log_from_addr __P((char *, struct svc_req *));
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static int addrcmp __P((struct sockaddr *, struct sockaddr *));
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/* log_from_addr ----------------------------------------------------------- */
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/*
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* Purpose: Log name of function called and source address
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* Returns: Nothing
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* Notes: Extracts the source address from the transport handle
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* passed in as part of the called procedure specification
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*/
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static void
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log_from_addr(fun_name, req)
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char *fun_name;
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struct svc_req *req;
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{
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struct sockaddr *addr;
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char hostname_buf[NI_MAXHOST];
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addr = svc_getrpccaller(req->rq_xprt)->buf;
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if (getnameinfo(addr , addr->sa_len, hostname_buf, sizeof hostname_buf,
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NULL, 0, 0) != 0)
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return;
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syslog(LOG_DEBUG, "%s from %s", fun_name, hostname_buf);
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}
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/* get_client -------------------------------------------------------------- */
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/*
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* Purpose: Get a CLIENT* for making RPC calls to lockd on given host
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* Returns: CLIENT* pointer, from clnt_udp_create, or NULL if error
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* Notes: Creating a CLIENT* is quite expensive, involving a
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* conversation with the remote portmapper to get the
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* port number. Since a given client is quite likely
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* to make several locking requests in succession, it is
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* desirable to cache the created CLIENT*.
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*
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* Since we are using UDP rather than TCP, there is no cost
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* to the remote system in keeping these cached indefinitely.
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* Unfortunately there is a snag: if the remote system
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* reboots, the cached portmapper results will be invalid,
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* and we will never detect this since all of the xxx_msg()
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* calls return no result - we just fire off a udp packet
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* and hope for the best.
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*
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* We solve this by discarding cached values after two
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* minutes, regardless of whether they have been used
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* in the meanwhile (since a bad one might have been used
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* plenty of times, as the host keeps retrying the request
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* and we keep sending the reply back to the wrong port).
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*
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* Given that the entries will always expire in the order
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* that they were created, there is no point in a LRU
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* algorithm for when the cache gets full - entries are
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* always re-used in sequence.
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*/
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static CLIENT *clnt_cache_ptr[CLIENT_CACHE_SIZE];
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static long clnt_cache_time[CLIENT_CACHE_SIZE]; /* time entry created */
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static struct sockaddr_storage clnt_cache_addr[CLIENT_CACHE_SIZE];
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static int clnt_cache_next_to_use = 0;
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static int
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addrcmp(sa1, sa2)
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struct sockaddr *sa1;
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struct sockaddr *sa2;
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{
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int len;
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void *p1, *p2;
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if (sa1->sa_family != sa2->sa_family)
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return -1;
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switch (sa1->sa_family) {
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case AF_INET:
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p1 = &((struct sockaddr_in *)sa1)->sin_addr;
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p2 = &((struct sockaddr_in *)sa2)->sin_addr;
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len = 4;
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break;
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case AF_INET6:
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p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
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p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
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len = 16;
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break;
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default:
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return -1;
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}
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return memcmp(p1, p2, len);
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}
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CLIENT *
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get_client(host_addr, vers)
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struct sockaddr *host_addr;
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rpcvers_t vers;
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{
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CLIENT *client;
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struct timeval retry_time, time_now;
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int i;
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char *netid;
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struct netconfig *nconf;
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char host[NI_MAXHOST];
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gettimeofday(&time_now, NULL);
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/*
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* Search for the given client in the cache, zapping any expired
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* entries that we happen to notice in passing.
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*/
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for (i = 0; i < CLIENT_CACHE_SIZE; i++) {
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client = clnt_cache_ptr[i];
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if (client && ((clnt_cache_time[i] + CLIENT_CACHE_LIFETIME)
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< time_now.tv_sec)) {
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/* Cache entry has expired. */
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if (debug_level > 3)
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syslog(LOG_DEBUG, "Expired CLIENT* in cache");
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clnt_cache_time[i] = 0L;
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clnt_destroy(client);
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clnt_cache_ptr[i] = NULL;
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client = NULL;
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}
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if (client && !addrcmp((struct sockaddr *)&clnt_cache_addr[i],
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host_addr)) {
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/* Found it! */
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if (debug_level > 3)
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syslog(LOG_DEBUG, "Found CLIENT* in cache");
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return (client);
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}
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}
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/* Not found in cache. Free the next entry if it is in use. */
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if (clnt_cache_ptr[clnt_cache_next_to_use]) {
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clnt_destroy(clnt_cache_ptr[clnt_cache_next_to_use]);
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clnt_cache_ptr[clnt_cache_next_to_use] = NULL;
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}
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/*
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* Need a host string for clnt_tp_create. Use NI_NUMERICHOST
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* to avoid DNS lookups.
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*/
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if (getnameinfo(host_addr, host_addr->sa_len, host, sizeof host,
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NULL, 0, NI_NUMERICHOST) != 0) {
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syslog(LOG_ERR, "unable to get name string for caller");
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return NULL;
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}
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#if 1
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if (host_addr->sa_family == AF_INET6)
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netid = "udp6";
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else
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netid = "udp";
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#else
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if (host_addr->sa_family == AF_INET6)
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netid = "tcp6";
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else
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netid = "tcp";
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#endif
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nconf = getnetconfigent(netid);
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if (nconf == NULL) {
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syslog(LOG_ERR, "could not get netconfig info for '%s': "
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"no /etc/netconfig file?", netid);
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return NULL;
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}
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client = clnt_tp_create(host, NLM_PROG, vers, nconf);
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freenetconfigent(nconf);
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if (!client) {
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syslog(LOG_ERR, "%s", clnt_spcreateerror("clntudp_create"));
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syslog(LOG_ERR, "Unable to return result to %s", host);
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return NULL;
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}
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/* Success - update the cache entry */
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clnt_cache_ptr[clnt_cache_next_to_use] = client;
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memcpy(&clnt_cache_addr[clnt_cache_next_to_use], host_addr,
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host_addr->sa_len);
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clnt_cache_time[clnt_cache_next_to_use] = time_now.tv_sec;
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if (++clnt_cache_next_to_use > CLIENT_CACHE_SIZE)
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clnt_cache_next_to_use = 0;
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/*
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* Disable the default timeout, so we can specify our own in calls
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* to clnt_call(). (Note that the timeout is a different concept
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* from the retry period set in clnt_udp_create() above.)
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*/
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retry_time.tv_sec = -1;
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retry_time.tv_usec = -1;
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clnt_control(client, CLSET_TIMEOUT, (char *)&retry_time);
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if (debug_level > 3)
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syslog(LOG_DEBUG, "Created CLIENT* for %s", host);
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return client;
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}
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/* transmit_result --------------------------------------------------------- */
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/*
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* Purpose: Transmit result for nlm_xxx_msg pseudo-RPCs
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* Returns: Nothing - we have no idea if the datagram got there
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* Notes: clnt_call() will always fail (with timeout) as we are
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* calling it with timeout 0 as a hack to just issue a datagram
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* without expecting a result
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*/
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void
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transmit_result(opcode, result, addr)
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int opcode;
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nlm_res *result;
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struct sockaddr *addr;
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{
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static char dummy;
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CLIENT *cli;
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struct timeval timeo;
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int success;
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if ((cli = get_client(addr, NLM_VERS)) != NULL) {
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timeo.tv_sec = 0; /* No timeout - not expecting response */
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timeo.tv_usec = 0;
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success = clnt_call(cli, opcode, xdr_nlm_res, result, xdr_void,
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&dummy, timeo);
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if (debug_level > 2)
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syslog(LOG_DEBUG, "clnt_call returns %d(%s)",
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success, clnt_sperrno(success));
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}
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}
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/* transmit4_result --------------------------------------------------------- */
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/*
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* Purpose: Transmit result for nlm4_xxx_msg pseudo-RPCs
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* Returns: Nothing - we have no idea if the datagram got there
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* Notes: clnt_call() will always fail (with timeout) as we are
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* calling it with timeout 0 as a hack to just issue a datagram
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* without expecting a result
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*/
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void
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transmit4_result(opcode, result, addr)
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int opcode;
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nlm4_res *result;
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struct sockaddr *addr;
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{
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static char dummy;
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CLIENT *cli;
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struct timeval timeo;
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int success;
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if ((cli = get_client(addr, NLM_VERS4)) != NULL) {
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timeo.tv_sec = 0; /* No timeout - not expecting response */
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timeo.tv_usec = 0;
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success = clnt_call(cli, opcode, xdr_nlm4_res, result, xdr_void,
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&dummy, timeo);
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if (debug_level > 2)
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syslog(LOG_DEBUG, "clnt_call returns %d(%s)",
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success, clnt_sperrno(success));
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}
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}
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/*
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* converts a struct nlm_lock to struct nlm4_lock
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*/
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static void nlmtonlm4 __P((struct nlm_lock *, struct nlm4_lock *));
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static void
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nlmtonlm4(arg, arg4)
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struct nlm_lock *arg;
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struct nlm4_lock *arg4;
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{
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memcpy(arg4, arg, sizeof(nlm_lock));
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arg4->l_offset = arg->l_offset;
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arg4->l_len = arg->l_len;
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}
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/* ------------------------------------------------------------------------- */
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/*
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* Functions for Unix<->Unix locking (ie. monitored locking, with rpc.statd
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* involved to ensure reclaim of locks after a crash of the "stateless"
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* server.
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*
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* These all come in two flavours - nlm_xxx() and nlm_xxx_msg().
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* The first are standard RPCs with argument and result.
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* The nlm_xxx_msg() calls implement exactly the same functions, but
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* use two pseudo-RPCs (one in each direction). These calls are NOT
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* standard use of the RPC protocol in that they do not return a result
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* at all (NB. this is quite different from returning a void result).
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* The effect of this is to make the nlm_xxx_msg() calls simple unacknowledged
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* datagrams, requiring higher-level code to perform retries.
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*
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* Despite the disadvantages of the nlm_xxx_msg() approach (some of which
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* are documented in the comments to get_client() above), this is the
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* interface used by all current commercial NFS implementations
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* [Solaris, SCO, AIX etc.]. This is presumed to be because these allow
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* implementations to continue using the standard RPC libraries, while
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* avoiding the block-until-result nature of the library interface.
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*
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* No client implementations have been identified so far that make use
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* of the true RPC version (early SunOS releases would be a likely candidate
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* for testing).
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*/
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/* nlm_test ---------------------------------------------------------------- */
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/*
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* Purpose: Test whether a specified lock would be granted if requested
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* Returns: nlm_granted (or error code)
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* Notes:
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*/
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nlm_testres *
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nlm_test_1_svc(arg, rqstp)
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nlm_testargs *arg;
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struct svc_req *rqstp;
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{
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static nlm_testres res;
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struct nlm4_lock arg4;
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struct nlm4_holder *holder;
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nlmtonlm4(&arg->alock, &arg4);
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if (debug_level)
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log_from_addr("nlm_test", rqstp);
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holder = testlock(&arg4, 0);
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/*
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* Copy the cookie from the argument into the result. Note that this
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* is slightly hazardous, as the structure contains a pointer to a
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* malloc()ed buffer that will get freed by the caller. However, the
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* main function transmits the result before freeing the argument
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* so it is in fact safe.
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*/
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res.cookie = arg->cookie;
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if (holder == NULL) {
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res.stat.stat = nlm_granted;
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} else {
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res.stat.stat = nlm_denied;
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memcpy(&res.stat.nlm_testrply_u.holder, holder,
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sizeof(struct nlm_holder));
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res.stat.nlm_testrply_u.holder.l_offset = holder->l_offset;
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res.stat.nlm_testrply_u.holder.l_len = holder->l_len;
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}
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return (&res);
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}
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void *
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nlm_test_msg_1_svc(arg, rqstp)
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nlm_testargs *arg;
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struct svc_req *rqstp;
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{
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nlm_testres res;
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static char dummy;
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struct sockaddr *addr;
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CLIENT *cli;
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int success;
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struct timeval timeo;
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struct nlm4_lock arg4;
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struct nlm4_holder *holder;
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nlmtonlm4(&arg->alock, &arg4);
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if (debug_level)
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log_from_addr("nlm_test_msg", rqstp);
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holder = testlock(&arg4, 0);
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res.cookie = arg->cookie;
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if (holder == NULL) {
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res.stat.stat = nlm_granted;
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} else {
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res.stat.stat = nlm_denied;
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memcpy(&res.stat.nlm_testrply_u.holder, holder,
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sizeof(struct nlm_holder));
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res.stat.nlm_testrply_u.holder.l_offset = holder->l_offset;
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res.stat.nlm_testrply_u.holder.l_len = holder->l_len;
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}
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/*
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* nlm_test has different result type to the other operations, so
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* can't use transmit_result() in this case
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*/
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addr = svc_getrpccaller(rqstp->rq_xprt)->buf;
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if ((cli = get_client(addr, NLM_VERS)) != NULL) {
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timeo.tv_sec = 0; /* No timeout - not expecting response */
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timeo.tv_usec = 0;
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success = clnt_call(cli, NLM_TEST_RES, xdr_nlm_testres,
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&res, xdr_void, &dummy, timeo);
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if (debug_level > 2)
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syslog(LOG_DEBUG, "clnt_call returns %d", success);
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}
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return (NULL);
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}
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/* nlm_lock ---------------------------------------------------------------- */
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/*
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* Purposes: Establish a lock
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* Returns: granted, denied or blocked
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* Notes: *** grace period support missing
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*/
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nlm_res *
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nlm_lock_1_svc(arg, rqstp)
|
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nlm_lockargs *arg;
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struct svc_req *rqstp;
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{
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static nlm_res res;
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struct nlm4_lockargs arg4;
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nlmtonlm4(&arg->alock, &arg4.alock);
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arg4.cookie = arg->cookie;
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arg4.block = arg->block;
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arg4.exclusive = arg->exclusive;
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arg4.reclaim = arg->reclaim;
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arg4.state = arg->state;
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if (debug_level)
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log_from_addr("nlm_lock", rqstp);
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/* copy cookie from arg to result. See comment in nlm_test_1() */
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res.cookie = arg->cookie;
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res.stat.stat = getlock(&arg4, rqstp, LOCK_MON);
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return (&res);
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}
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void *
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nlm_lock_msg_1_svc(arg, rqstp)
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nlm_lockargs *arg;
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struct svc_req *rqstp;
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{
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static nlm_res res;
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struct nlm4_lockargs arg4;
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nlmtonlm4(&arg->alock, &arg4.alock);
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arg4.cookie = arg->cookie;
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arg4.block = arg->block;
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arg4.exclusive = arg->exclusive;
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arg4.reclaim = arg->reclaim;
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arg4.state = arg->state;
|
|
|
|
if (debug_level)
|
|
log_from_addr("nlm_lock_msg", rqstp);
|
|
|
|
res.cookie = arg->cookie;
|
|
res.stat.stat = getlock(&arg4, rqstp, LOCK_ASYNC | LOCK_MON);
|
|
transmit_result(NLM_LOCK_RES, &res,
|
|
(struct sockaddr *)svc_getcaller(rqstp->rq_xprt));
|
|
|
|
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_lock arg4;
|
|
|
|
nlmtonlm4(&arg->alock, &arg4);
|
|
|
|
if (debug_level)
|
|
log_from_addr("nlm_cancel", rqstp);
|
|
|
|
/* copy cookie from arg to result. See comment in nlm_test_1() */
|
|
res.cookie = arg->cookie;
|
|
|
|
/*
|
|
* Since at present we never return 'nlm_blocked', there can never be
|
|
* a lock to cancel, so this call always fails.
|
|
*/
|
|
res.stat.stat = unlock(&arg4, LOCK_CANCEL);
|
|
return (&res);
|
|
}
|
|
|
|
void *
|
|
nlm_cancel_msg_1_svc(arg, rqstp)
|
|
nlm_cancargs *arg;
|
|
struct svc_req *rqstp;
|
|
{
|
|
static nlm_res res;
|
|
struct nlm4_lock arg4;
|
|
|
|
nlmtonlm4(&arg->alock, &arg4);
|
|
|
|
if (debug_level)
|
|
log_from_addr("nlm_cancel_msg", rqstp);
|
|
|
|
res.cookie = arg->cookie;
|
|
/*
|
|
* Since at present we never return 'nlm_blocked', there can never be
|
|
* a lock to cancel, so this call always fails.
|
|
*/
|
|
res.stat.stat = unlock(&arg4, LOCK_CANCEL);
|
|
transmit_result(NLM_CANCEL_RES, &res,
|
|
(struct sockaddr *)svc_getcaller(rqstp->rq_xprt));
|
|
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 (debug_level)
|
|
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 (debug_level)
|
|
log_from_addr("nlm_unlock_msg", rqstp);
|
|
|
|
res.stat.stat = unlock(&arg4, 0);
|
|
res.cookie = arg->cookie;
|
|
|
|
transmit_result(NLM_UNLOCK_RES, &res,
|
|
(struct sockaddr *)svc_getcaller(rqstp->rq_xprt));
|
|
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;
|
|
|
|
if (debug_level)
|
|
log_from_addr("nlm_granted", rqstp);
|
|
|
|
/* copy cookie from arg to result. See comment in nlm_test_1() */
|
|
res.cookie = arg->cookie;
|
|
|
|
res.stat.stat = nlm_granted;
|
|
return (&res);
|
|
}
|
|
|
|
void *
|
|
nlm_granted_msg_1_svc(arg, rqstp)
|
|
nlm_testargs *arg;
|
|
struct svc_req *rqstp;
|
|
{
|
|
static nlm_res res;
|
|
|
|
if (debug_level)
|
|
log_from_addr("nlm_granted_msg", rqstp);
|
|
|
|
res.cookie = arg->cookie;
|
|
res.stat.stat = nlm_granted;
|
|
transmit_result(NLM_GRANTED_RES, &res,
|
|
(struct sockaddr *)svc_getcaller(rqstp->rq_xprt));
|
|
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;
|
|
{
|
|
if (debug_level)
|
|
log_from_addr("nlm_test_res", rqstp);
|
|
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 (debug_level)
|
|
log_from_addr("nlm_lock_res", rqstp);
|
|
|
|
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 (debug_level)
|
|
log_from_addr("nlm_cancel_res", rqstp);
|
|
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 (debug_level)
|
|
log_from_addr("nlm_unlock_res", rqstp);
|
|
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 (debug_level)
|
|
log_from_addr("nlm_granted_res", rqstp);
|
|
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 (debug_level)
|
|
log_from_addr("nlm_share", rqstp);
|
|
|
|
res.cookie = arg->cookie;
|
|
res.stat = nlm_granted;
|
|
res.sequence = 1234356; /* X/Open says this field is ignored? */
|
|
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 (debug_level)
|
|
log_from_addr("nlm_unshare", rqstp);
|
|
|
|
res.cookie = arg->cookie;
|
|
res.stat = nlm_granted;
|
|
res.sequence = 1234356; /* X/Open says this field is ignored? */
|
|
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;
|
|
|
|
if (debug_level)
|
|
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 = nlm_granted;
|
|
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 (debug_level)
|
|
log_from_addr("nlm_free_all", rqstp);
|
|
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 (debug_level)
|
|
log_from_addr("nlm4_test", rqstp);
|
|
|
|
holder = testlock(&arg->alock, 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 (debug_level)
|
|
log_from_addr("nlm4_test_msg", rqstp);
|
|
|
|
holder = testlock(&arg->alock, 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 = svc_getrpccaller(rqstp->rq_xprt)->buf;
|
|
if ((cli = get_client(addr, NLM_VERS4)) != NULL) {
|
|
timeo.tv_sec = 0; /* No timeout - not expecting response */
|
|
timeo.tv_usec = 0;
|
|
|
|
success = clnt_call(cli, NLM4_TEST_RES, xdr_nlm4_testres,
|
|
&res, xdr_void, &dummy, timeo);
|
|
|
|
if (debug_level > 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 (debug_level)
|
|
log_from_addr("nlm4_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_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 (debug_level)
|
|
log_from_addr("nlm4_lock_msg", rqstp);
|
|
|
|
res.cookie = arg->cookie;
|
|
res.stat.stat = getlock(arg, rqstp, LOCK_MON | LOCK_ASYNC | LOCK_V4);
|
|
transmit4_result(NLM4_LOCK_RES, &res,
|
|
(struct sockaddr *)svc_getcaller(rqstp->rq_xprt));
|
|
|
|
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 (debug_level)
|
|
log_from_addr("nlm4_cancel", rqstp);
|
|
|
|
/* copy cookie from arg to result. See comment in nlm_test_1() */
|
|
res.cookie = arg->cookie;
|
|
|
|
/*
|
|
* Since at present we never return 'nlm_blocked', there can never be
|
|
* a lock to cancel, so this call always fails.
|
|
*/
|
|
res.stat.stat = unlock(&arg->alock, LOCK_CANCEL);
|
|
return (&res);
|
|
}
|
|
|
|
void *
|
|
nlm4_cancel_msg_4_svc(arg, rqstp)
|
|
nlm4_cancargs *arg;
|
|
struct svc_req *rqstp;
|
|
{
|
|
static nlm4_res res;
|
|
|
|
if (debug_level)
|
|
log_from_addr("nlm4_cancel_msg", rqstp);
|
|
|
|
res.cookie = arg->cookie;
|
|
/*
|
|
* Since at present we never return 'nlm_blocked', there can never be
|
|
* a lock to cancel, so this call always fails.
|
|
*/
|
|
res.stat.stat = unlock(&arg->alock, LOCK_CANCEL | LOCK_V4);
|
|
transmit4_result(NLM4_CANCEL_RES, &res,
|
|
(struct sockaddr *)svc_getcaller(rqstp->rq_xprt));
|
|
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 (debug_level)
|
|
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 (debug_level)
|
|
log_from_addr("nlm4_unlock_msg", rqstp);
|
|
|
|
res.stat.stat = unlock(&arg->alock, LOCK_V4);
|
|
res.cookie = arg->cookie;
|
|
|
|
transmit4_result(NLM4_UNLOCK_RES, &res,
|
|
(struct sockaddr *)svc_getcaller(rqstp->rq_xprt));
|
|
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;
|
|
|
|
if (debug_level)
|
|
log_from_addr("nlm4_granted", rqstp);
|
|
|
|
/* copy cookie from arg to result. See comment in nlm_test_1() */
|
|
res.cookie = arg->cookie;
|
|
|
|
res.stat.stat = nlm4_granted;
|
|
return (&res);
|
|
}
|
|
|
|
void *
|
|
nlm4_granted_msg_4_svc(arg, rqstp)
|
|
nlm4_testargs *arg;
|
|
struct svc_req *rqstp;
|
|
{
|
|
static nlm4_res res;
|
|
|
|
if (debug_level)
|
|
log_from_addr("nlm4_granted_msg", rqstp);
|
|
|
|
res.cookie = arg->cookie;
|
|
res.stat.stat = nlm4_granted;
|
|
transmit4_result(NLM4_GRANTED_RES, &res,
|
|
(struct sockaddr *)svc_getrpccaller(rqstp->rq_xprt)->buf);
|
|
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;
|
|
{
|
|
if (debug_level)
|
|
log_from_addr("nlm4_test_res", rqstp);
|
|
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 (debug_level)
|
|
log_from_addr("nlm4_lock_res", rqstp);
|
|
|
|
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 (debug_level)
|
|
log_from_addr("nlm4_cancel_res", rqstp);
|
|
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;
|
|
struct svc_req *rqstp;
|
|
{
|
|
if (debug_level)
|
|
log_from_addr("nlm4_unlock_res", rqstp);
|
|
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;
|
|
struct svc_req *rqstp;
|
|
{
|
|
if (debug_level)
|
|
log_from_addr("nlm4_granted_res", rqstp);
|
|
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 (debug_level)
|
|
log_from_addr("nlm4_share", rqstp);
|
|
|
|
res.cookie = arg->cookie;
|
|
res.stat = nlm4_granted;
|
|
res.sequence = 1234356; /* X/Open says this field is ignored? */
|
|
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 (debug_level)
|
|
log_from_addr("nlm_unshare", rqstp);
|
|
|
|
res.cookie = arg->cookie;
|
|
res.stat = nlm4_granted;
|
|
res.sequence = 1234356; /* X/Open says this field is ignored? */
|
|
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 (debug_level)
|
|
log_from_addr("nlm4_nm_lock", rqstp);
|
|
|
|
/* copy cookie from arg to result. See comment in nlm4_test_1() */
|
|
res.cookie = arg->cookie;
|
|
res.stat.stat = nlm4_granted;
|
|
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)
|
|
nlm_notify *arg;
|
|
struct svc_req *rqstp;
|
|
{
|
|
static char dummy;
|
|
|
|
if (debug_level)
|
|
log_from_addr("nlm4_free_all", rqstp);
|
|
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;
|
|
{
|
|
static char dummy;
|
|
notify(arg->mon_name, arg->state);
|
|
return (&dummy);
|
|
}
|