/* $NetBSD: lock_proc.c,v 1.9 2007/11/04 23:12:50 christos 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 #ifndef lint __RCSID("$NetBSD: lock_proc.c,v 1.9 2007/11/04 23:12:50 christos Exp $"); #endif #include #include #include #include #include #include #include #include #include #include #include #include "lockd.h" #include #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 int addrcmp(const struct sockaddr *, const struct sockaddr *); static void nlmtonlm4(struct nlm_lock *, struct nlm4_lock *); /* 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(const char *fun_name, struct svc_req *req) { struct sockaddr *addr; char hostname_buf[NI_MAXHOST]; addr = svc_getrpccaller(req->rq_xprt)->buf; if (getnameinfo(addr, (socklen_t)addr->sa_len, hostname_buf, sizeof(hostname_buf), NULL, 0, 0) != 0) return; syslog(LOG_DEBUG, "%s from %s", fun_name, hostname_buf); } /* 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 int clnt_cache_next_to_use = 0; static int addrcmp(const struct sockaddr *sa1, const struct sockaddr *sa2) { size_t len; const void *p1, *p2; if (sa1->sa_family != sa2->sa_family) return -1; switch (sa1->sa_family) { case AF_INET: p1 = &((const struct sockaddr_in *)(const void *)sa1)->sin_addr; p2 = &((const struct sockaddr_in *)(const void *)sa2)->sin_addr; len = 4; break; case AF_INET6: p1 = &((const struct sockaddr_in6 *)(const void *)sa1)->sin6_addr; p2 = &((const struct sockaddr_in6 *)(const void *)sa2)->sin6_addr; len = 16; break; default: return -1; } return memcmp(p1, p2, len); } CLIENT * get_client(struct sockaddr *host_addr, rpcvers_t vers) { CLIENT *client; struct timeval retry_time, time_now; int i; const char *netid; struct netconfig *nconf; char host[NI_MAXHOST]; (void)gettimeofday(&time_now, NULL); /* * Search for the given client in the cache, zapping any expired * entries that we happen to notice in passing. */ for (i = 0; i < CLIENT_CACHE_SIZE; i++) { client = clnt_cache_ptr[i]; if (client && ((clnt_cache_time[i] + CLIENT_CACHE_LIFETIME) < time_now.tv_sec)) { /* Cache entry has expired. */ if (debug_level > 3) syslog(LOG_DEBUG, "Expired CLIENT* in cache"); clnt_cache_time[i] = 0L; clnt_destroy(client); clnt_cache_ptr[i] = NULL; client = NULL; } if (client && !addrcmp((const struct sockaddr *)(const void *) &clnt_cache_addr[i], host_addr)) { /* Found it! */ if (debug_level > 3) syslog(LOG_DEBUG, "Found CLIENT* in cache"); return client; } } /* Not 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; } /* * Need a host string for clnt_tp_create. Use NI_NUMERICHOST * to avoid DNS lookups. */ if (getnameinfo(host_addr, (socklen_t)host_addr->sa_len, host, sizeof(host), NULL, 0, NI_NUMERICHOST) != 0) { syslog(LOG_ERR, "unable to get name string for caller"); return NULL; } #if 1 if (host_addr->sa_family == AF_INET6) netid = "udp6"; else netid = "udp"; #else if (host_addr->sa_family == AF_INET6) netid = "tcp6"; else netid = "tcp"; #endif nconf = getnetconfigent(netid); if (nconf == NULL) { syslog(LOG_ERR, "could not get netconfig info for '%s': " "no /etc/netconfig file?", netid); return NULL; } client = clnt_tp_create(host, NLM_PROG, vers, nconf); freenetconfigent(nconf); if (!client) { syslog(LOG_ERR, "%s", clnt_spcreateerror("clntudp_create")); syslog(LOG_ERR, "Unable to return result to %s", host); return NULL; } /* Success - update the cache entry */ clnt_cache_ptr[clnt_cache_next_to_use] = client; (void)memcpy(&clnt_cache_addr[clnt_cache_next_to_use], host_addr, (size_t)host_addr->sa_len); clnt_cache_time[clnt_cache_next_to_use] = time_now.tv_sec; if (++clnt_cache_next_to_use >= CLIENT_CACHE_SIZE) clnt_cache_next_to_use = 0; /* * 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 *)(void *)&retry_time); if (debug_level > 3) syslog(LOG_DEBUG, "Created CLIENT* for %s", host); return client; } /* transmit_result --------------------------------------------------------- */ /* * Purpose: Transmit result for nlm_xxx_msg pseudo-RPCs * Returns: Nothing - we have no idea if the datagram got there * 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 */ void transmit_result(int opcode, nlm_res *result, struct sockaddr *addr) { static char dummy; CLIENT *cli; struct timeval timeo; int success; if ((cli = get_client(addr, NLM_VERS)) != NULL) { timeo.tv_sec = 0; /* No timeout - not expecting response */ timeo.tv_usec = 0; success = clnt_call(cli, (rpcproc_t)opcode, xdr_nlm_res, result, xdr_void, &dummy, timeo); if (debug_level > 2) syslog(LOG_DEBUG, "clnt_call returns %d(%s)", success, clnt_sperrno(success)); } } /* transmit4_result --------------------------------------------------------- */ /* * Purpose: Transmit result for nlm4_xxx_msg pseudo-RPCs * Returns: Nothing - we have no idea if the datagram got there * 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 */ void transmit4_result(int opcode, nlm4_res *result, struct sockaddr *addr) { static char dummy; CLIENT *cli; struct timeval timeo; int success; 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, (rpcproc_t)opcode, xdr_nlm4_res, result, xdr_void, &dummy, timeo); if (debug_level > 2) syslog(LOG_DEBUG, "clnt_call returns %d(%s)", success, clnt_sperrno(success)); } } /* * converts a struct nlm_lock to struct nlm4_lock */ static void nlmtonlm4(struct nlm_lock *arg, struct nlm4_lock *arg4) { (void)memcpy(arg4, arg, sizeof(nlm_lock)); 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(nlm_testargs *arg, struct svc_req *rqstp) { static nlm_testres result; struct nlm4_lock arg4; struct nlm4_holder *holder; nlmtonlm4(&arg->alock, &arg4); if (debug_level) log_from_addr("nlm_test", rqstp); holder = testlock(&arg4, 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. */ result.cookie = arg->cookie; if (holder == NULL) { result.stat.stat = nlm_granted; } else { result.stat.stat = nlm_denied; (void)memcpy(&result.stat.nlm_testrply_u.holder, holder, sizeof(struct nlm_holder)); result.stat.nlm_testrply_u.holder.l_offset = (unsigned int)holder->l_offset; result.stat.nlm_testrply_u.holder.l_len = (unsigned int)holder->l_len; } return &result; } void * nlm_test_msg_1_svc(nlm_testargs *arg, struct svc_req *rqstp) { nlm_testres result; 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 (debug_level) log_from_addr("nlm_test_msg", rqstp); holder = testlock(&arg4, 0); result.cookie = arg->cookie; if (holder == NULL) { result.stat.stat = nlm_granted; } else { result.stat.stat = nlm_denied; (void)memcpy(&result.stat.nlm_testrply_u.holder, holder, sizeof(struct nlm_holder)); result.stat.nlm_testrply_u.holder.l_offset = (unsigned int)holder->l_offset; result.stat.nlm_testrply_u.holder.l_len = (unsigned int)holder->l_len; } /* * nlm_test has different result type to the other operations, so * can't use transmit_result() in this case */ addr = svc_getrpccaller(rqstp->rq_xprt)->buf; if ((cli = get_client(addr, NLM_VERS)) != NULL) { timeo.tv_sec = 0; /* No timeout - not expecting response */ timeo.tv_usec = 0; success = clnt_call(cli, NLM_TEST_RES, xdr_nlm_testres, &result, 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 */ nlm_res * nlm_lock_1_svc(nlm_lockargs *arg, struct svc_req *rqstp) { static nlm_res result; 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 (debug_level) log_from_addr("nlm_lock", rqstp); /* copy cookie from arg to result. See comment in nlm_test_1() */ result.cookie = arg->cookie; result.stat.stat = getlock(&arg4, rqstp, LOCK_MON); return &result; } void * nlm_lock_msg_1_svc(nlm_lockargs *arg, struct svc_req *rqstp) { static nlm_res result; 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 (debug_level) log_from_addr("nlm_lock_msg", rqstp); result.cookie = arg->cookie; result.stat.stat = getlock(&arg4, rqstp, LOCK_ASYNC | LOCK_MON); transmit_result(NLM_LOCK_RES, &result, (struct sockaddr *)(void *)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(nlm_cancargs *arg, struct svc_req *rqstp) { static nlm_res result; 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() */ result.cookie = arg->cookie; /* * Since at present we never return 'nlm_blocked', there can never be * a lock to cancel, so this call always fails. */ result.stat.stat = unlock(&arg4, LOCK_CANCEL); return &result; } void * nlm_cancel_msg_1_svc(nlm_cancargs *arg, struct svc_req *rqstp) { static nlm_res result; struct nlm4_lock arg4; nlmtonlm4(&arg->alock, &arg4); if (debug_level) log_from_addr("nlm_cancel_msg", rqstp); result.cookie = arg->cookie; /* * Since at present we never return 'nlm_blocked', there can never be * a lock to cancel, so this call always fails. */ result.stat.stat = unlock(&arg4, LOCK_CANCEL); transmit_result(NLM_CANCEL_RES, &result, (struct sockaddr *)(void *)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(nlm_unlockargs *arg, struct svc_req *rqstp) { static nlm_res result; struct nlm4_lock arg4; nlmtonlm4(&arg->alock, &arg4); if (debug_level) log_from_addr("nlm_unlock", rqstp); result.stat.stat = unlock(&arg4, 0); result.cookie = arg->cookie; return &result; } void * nlm_unlock_msg_1_svc(nlm_unlockargs *arg, struct svc_req *rqstp) { static nlm_res result; struct nlm4_lock arg4; nlmtonlm4(&arg->alock, &arg4); if (debug_level) log_from_addr("nlm_unlock_msg", rqstp); result.stat.stat = unlock(&arg4, 0); result.cookie = arg->cookie; transmit_result(NLM_UNLOCK_RES, &result, (struct sockaddr *)(void *)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(nlm_testargs *arg, struct svc_req *rqstp) { static nlm_res result; if (debug_level) log_from_addr("nlm_granted", rqstp); /* copy cookie from arg to result. See comment in nlm_test_1() */ result.cookie = arg->cookie; result.stat.stat = nlm_granted; return &result; } void * nlm_granted_msg_1_svc(nlm_testargs *arg, struct svc_req *rqstp) { static nlm_res result; if (debug_level) log_from_addr("nlm_granted_msg", rqstp); result.cookie = arg->cookie; result.stat.stat = nlm_granted; transmit_result(NLM_GRANTED_RES, &result, (struct sockaddr *)(void *)svc_getcaller(rqstp->rq_xprt)); return NULL; } /* nlm_test_res ------------------------------------------------------------ */ /* * Purpose: Accept result from earlier nlm_test_msg() call * Returns: Nothing */ void * /*ARGSUSED*/ nlm_test_res_1_svc(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 * /*ARGSUSED*/ nlm_lock_res_1_svc(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 * /*ARGSUSED*/ nlm_cancel_res_1_svc(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 * /*ARGSUSED*/ nlm_unlock_res_1_svc(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 * /*ARGSUSED*/ nlm_granted_res_1_svc(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(nlm_shareargs *arg, struct svc_req *rqstp) { static nlm_shareres result; if (debug_level) log_from_addr("nlm_share", rqstp); result.cookie = arg->cookie; result.stat = nlm_granted; result.sequence = 1234356; /* X/Open says this field is ignored? */ return &result; } /* nlm_unshare ------------------------------------------------------------ */ /* * Purpose: Release a DOS-style lock * Returns: nlm_granted, unless in grace period * Notes: */ nlm_shareres * nlm_unshare_3_svc(nlm_shareargs *arg, struct svc_req *rqstp) { static nlm_shareres result; if (debug_level) log_from_addr("nlm_unshare", rqstp); result.cookie = arg->cookie; result.stat = nlm_granted; result.sequence = 1234356; /* X/Open says this field is ignored? */ return &result; } /* 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(nlm_lockargs *arg, struct svc_req *rqstp) { static nlm_res result; if (debug_level) log_from_addr("nlm_nm_lock", rqstp); /* copy cookie from arg to result. See comment in nlm_test_1() */ result.cookie = arg->cookie; result.stat.stat = nlm_granted; return &result; } /* 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 * /*ARGSUSED*/ nlm_free_all_3_svc(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(nlm4_testargs *arg, struct svc_req *rqstp) { static nlm4_testres result; 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. */ result.cookie = arg->cookie; if (holder == NULL) { result.stat.stat = nlm4_granted; } else { result.stat.stat = nlm4_denied; (void)memcpy(&result.stat.nlm4_testrply_u.holder, holder, sizeof(struct nlm4_holder)); } return &result; } void * nlm4_test_msg_4_svc(nlm4_testargs *arg, struct svc_req *rqstp) { nlm4_testres result; 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); result.cookie = arg->cookie; if (holder == NULL) { result.stat.stat = nlm4_granted; } else { result.stat.stat = nlm4_denied; (void)memcpy(&result.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, &result, 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(nlm4_lockargs *arg, struct svc_req *rqstp) { static nlm4_res result; if (debug_level) log_from_addr("nlm4_lock", rqstp); /* copy cookie from arg to result. See comment in nlm_test_4() */ result.cookie = arg->cookie; result.stat.stat = (enum nlm4_stats)getlock(arg, rqstp, LOCK_MON | LOCK_V4); return &result; } void * nlm4_lock_msg_4_svc(nlm4_lockargs *arg, struct svc_req *rqstp) { static nlm4_res result; if (debug_level) log_from_addr("nlm4_lock_msg", rqstp); result.cookie = arg->cookie; result.stat.stat = (enum nlm4_stats)getlock(arg, rqstp, LOCK_MON | LOCK_ASYNC | LOCK_V4); transmit4_result(NLM4_LOCK_RES, &result, (struct sockaddr *)(void *)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(nlm4_cancargs *arg, struct svc_req *rqstp) { static nlm4_res result; if (debug_level) log_from_addr("nlm4_cancel", rqstp); /* copy cookie from arg to result. See comment in nlm_test_1() */ result.cookie = arg->cookie; /* * Since at present we never return 'nlm_blocked', there can never be * a lock to cancel, so this call always fails. */ result.stat.stat = (enum nlm4_stats)unlock(&arg->alock, LOCK_CANCEL); return &result; } void * nlm4_cancel_msg_4_svc(nlm4_cancargs *arg, struct svc_req *rqstp) { static nlm4_res result; if (debug_level) log_from_addr("nlm4_cancel_msg", rqstp); result.cookie = arg->cookie; /* * Since at present we never return 'nlm_blocked', there can never be * a lock to cancel, so this call always fails. */ result.stat.stat = (enum nlm4_stats)unlock(&arg->alock, LOCK_CANCEL | LOCK_V4); transmit4_result(NLM4_CANCEL_RES, &result, (struct sockaddr *)(void *)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(nlm4_unlockargs *arg, struct svc_req *rqstp) { static nlm4_res result; if (debug_level) log_from_addr("nlm4_unlock", rqstp); result.stat.stat = (enum nlm4_stats)unlock(&arg->alock, LOCK_V4); result.cookie = arg->cookie; return &result; } void * nlm4_unlock_msg_4_svc(nlm4_unlockargs *arg, struct svc_req *rqstp) { static nlm4_res result; if (debug_level) log_from_addr("nlm4_unlock_msg", rqstp); result.stat.stat = (enum nlm4_stats)unlock(&arg->alock, LOCK_V4); result.cookie = arg->cookie; transmit4_result(NLM4_UNLOCK_RES, &result, (struct sockaddr *)(void *)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(nlm4_testargs *arg, struct svc_req *rqstp) { static nlm4_res result; if (debug_level) log_from_addr("nlm4_granted", rqstp); /* copy cookie from arg to result. See comment in nlm_test_1() */ result.cookie = arg->cookie; result.stat.stat = nlm4_granted; return &result; } void * nlm4_granted_msg_4_svc(nlm4_testargs *arg, struct svc_req *rqstp) { static nlm4_res result; if (debug_level) log_from_addr("nlm4_granted_msg", rqstp); result.cookie = arg->cookie; result.stat.stat = nlm4_granted; transmit4_result(NLM4_GRANTED_RES, &result, (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 * /*ARGSUSED*/ nlm4_test_res_4_svc(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 * /*ARGSUSED*/ nlm4_lock_res_4_svc(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 * /*ARGSUSED*/ nlm4_cancel_res_4_svc(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 * /*ARGSUSED*/ nlm4_unlock_res_4_svc(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 * /*ARGSUSED*/ nlm4_granted_res_4_svc(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(nlm4_shareargs *arg, struct svc_req *rqstp) { static nlm4_shareres result; if (debug_level) log_from_addr("nlm4_share", rqstp); result.cookie = arg->cookie; result.stat = nlm4_granted; result.sequence = 1234356; /* X/Open says this field is ignored? */ return &result; } /* nlm4_unshare ------------------------------------------------------------ */ /* * Purpose: Release a DOS-style lock * Returns: nlm_granted, unless in grace period * Notes: */ nlm4_shareres * nlm4_unshare_4_svc(nlm4_shareargs *arg, struct svc_req *rqstp) { static nlm4_shareres result; if (debug_level) log_from_addr("nlm_unshare", rqstp); result.cookie = arg->cookie; result.stat = nlm4_granted; result.sequence = 1234356; /* X/Open says this field is ignored? */ return &result; } /* 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(nlm4_lockargs *arg, struct svc_req *rqstp) { static nlm4_res result; if (debug_level) log_from_addr("nlm4_nm_lock", rqstp); /* copy cookie from arg to result. See comment in nlm4_test_1() */ result.cookie = arg->cookie; result.stat.stat = nlm4_granted; return &result; } /* 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 * /*ARGSUSED*/ nlm4_free_all_4_svc(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 * /*ARGSUSED*/ nlm_sm_notify_0_svc(struct nlm_sm_status *arg, struct svc_req *rqstp) { static char dummy; notify(arg->mon_name, arg->state); return &dummy; }