3 * A.R. Gordon (andrew.gordon@net-tel.co.uk). All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed for the FreeBSD project
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY ANDREW GORDON AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * $FreeBSD: src/usr.sbin/rpc.statd/procs.c,v 1.4.2.2 2002/07/11 17:41:28 alfred Exp $
42 #include <netdb.h> /* for gethostbyname() */
46 /* sm_stat_1 --------------------------------------------------------------- */
48 Purpose: RPC call to enquire if a host can be monitored
49 Returns: TRUE for any hostname that can be looked up to give
54 sm_stat_1_svc(sm_name
*arg
, __unused
struct svc_req
*req
)
56 static sm_stat_res res
;
58 if (debug
) syslog(LOG_DEBUG
, "stat called for host %s", arg
->mon_name
);
60 if (gethostbyname(arg
->mon_name
)) res
.res_stat
= stat_succ
;
63 syslog(LOG_ERR
, "invalid hostname to sm_stat: %s", arg
->mon_name
);
64 res
.res_stat
= stat_fail
;
67 res
.state
= status_info
->ourState
;
71 /* sm_mon_1 ---------------------------------------------------------------- */
73 Purpose: RPC procedure to establish a monitor request
74 Returns: Success, unless lack of resources prevents
75 the necessary structures from being set up
76 to record the request, or if the hostname is not
77 valid (as judged by gethostbyname())
81 sm_mon_1_svc(mon
*arg
, __unused
struct svc_req
*req
)
83 static sm_stat_res res
;
89 syslog(LOG_DEBUG
, "monitor request for host %s", arg
->mon_id
.mon_name
);
90 syslog(LOG_DEBUG
, "recall host: %s prog: %d ver: %d proc: %d",
91 arg
->mon_id
.my_id
.my_name
,
92 arg
->mon_id
.my_id
.my_prog
, arg
->mon_id
.my_id
.my_vers
,
93 arg
->mon_id
.my_id
.my_proc
);
96 res
.res_stat
= stat_fail
; /* Assume fail until set otherwise */
97 res
.state
= status_info
->ourState
;
99 /* Find existing host entry, or create one if not found */
100 /* If find_host() fails, it will have logged the error already. */
101 if (!gethostbyname(arg
->mon_id
.mon_name
))
103 syslog(LOG_ERR
, "Invalid hostname to sm_mon: %s", arg
->mon_id
.mon_name
);
105 else if ((hp
= find_host(arg
->mon_id
.mon_name
, TRUE
)))
107 lp
= (MonList
*)malloc(sizeof(MonList
));
110 syslog(LOG_ERR
, "Out of memory");
114 strncpy(lp
->notifyHost
, arg
->mon_id
.my_id
.my_name
, SM_MAXSTRLEN
);
115 lp
->notifyProg
= arg
->mon_id
.my_id
.my_prog
;
116 lp
->notifyVers
= arg
->mon_id
.my_id
.my_vers
;
117 lp
->notifyProc
= arg
->mon_id
.my_id
.my_proc
;
118 memcpy(lp
->notifyData
, arg
->priv
, sizeof(lp
->notifyData
));
120 lp
->next
= hp
->monList
;
124 res
.res_stat
= stat_succ
; /* Report success */
131 /* do_unmon ---------------------------------------------------------------- */
133 Purpose: Remove a monitor request from a host
134 Returns: TRUE if found, FALSE if not found.
135 Notes: Common code from sm_unmon_1_svc and sm_unmon_all_1_svc
136 In the unlikely event of more than one identical monitor
137 request, all are removed.
141 do_unmon(HostInfo
*hp
, my_id
*idp
)
144 MonList
*last
= NULL
;
150 if (!strncasecmp(idp
->my_name
, lp
->notifyHost
, SM_MAXSTRLEN
)
151 && (idp
->my_prog
== lp
->notifyProg
) && (idp
->my_proc
== lp
->notifyProc
)
152 && (idp
->my_vers
== lp
->notifyVers
))
154 /* found one. Unhook from chain and free. */
156 if (last
) last
->next
= next
;
157 else hp
->monList
= next
;
171 /* sm_unmon_1 -------------------------------------------------------------- */
173 Purpose: RPC procedure to release a monitor request.
174 Returns: Local machine's status number
175 Notes: The supplied mon_id should match the value passed in an
176 earlier call to sm_mon_1
180 sm_unmon_1_svc(mon_id
*arg
, __unused
struct svc_req
*req
)
187 syslog(LOG_DEBUG
, "un-monitor request for host %s", arg
->mon_name
);
188 syslog(LOG_DEBUG
, "recall host: %s prog: %d ver: %d proc: %d",
189 arg
->my_id
.my_name
, arg
->my_id
.my_prog
,
190 arg
->my_id
.my_vers
, arg
->my_id
.my_proc
);
193 if ((hp
= find_host(arg
->mon_name
, FALSE
)))
195 if (do_unmon(hp
, &arg
->my_id
)) sync_file();
198 syslog(LOG_ERR
, "unmon request from %s, no matching monitor",
202 else syslog(LOG_ERR
, "unmon request from %s for unknown host %s",
203 arg
->my_id
.my_name
, arg
->mon_name
);
205 res
.state
= status_info
->ourState
;
210 /* sm_unmon_all_1 ---------------------------------------------------------- */
212 Purpose: RPC procedure to release monitor requests.
213 Returns: Local machine's status number
214 Notes: Releases all monitor requests (if any) from the specified
215 host and program number.
219 sm_unmon_all_1_svc(my_id
*arg
, __unused
struct svc_req
*req
)
227 syslog(LOG_DEBUG
, "unmon_all for host: %s prog: %d ver: %d proc: %d",
228 arg
->my_name
, arg
->my_prog
, arg
->my_vers
, arg
->my_proc
);
231 for (i
= status_info
->noOfHosts
, hp
= status_info
->hosts
; i
; i
--, hp
++)
237 res
.state
= status_info
->ourState
;
242 /* sm_simu_crash_1 --------------------------------------------------------- */
244 Purpose: RPC procedure to simulate a crash
246 Notes: Standardised mechanism for debug purposes
247 The specification says that we should drop all of our
248 status information (apart from the list of monitored hosts
249 on disc). However, this would confuse the rpc.lockd
250 which would be unaware that all of its monitor requests
251 had been silently junked. Hence we in fact retain all
252 current requests and simply increment the status counter
253 and inform all hosts on the monitor list.
257 sm_simu_crash_1_svc(__unused
void *v
, __unused
struct svc_req
*req
)
264 if (debug
) syslog(LOG_DEBUG
, "simu_crash called!!");
266 /* Simulate crash by setting notify-required flag on all monitored */
267 /* hosts, and incrementing our status number. notify_hosts() is */
268 /* then called to fork a process to do the notifications. */
270 for (i
= status_info
->noOfHosts
, hp
= status_info
->hosts
; i
; i
--, hp
++)
275 hp
->notifyReqd
= TRUE
;
278 status_info
->ourState
+= 2; /* always even numbers if not crashed */
280 if (work_to_do
) notify_hosts();
285 /* sm_notify_1 ------------------------------------------------------------- */
287 Purpose: RPC procedure notifying local statd of the crash of another
289 Notes: There is danger of deadlock, since it is quite likely that
290 the client procedure that we call will in turn call us
291 to remove or adjust the monitor request.
292 We therefore fork() a process to do the notifications.
293 Note that the main HostInfo structure is in a mmap()
294 region and so will be shared with the child, but the
295 monList pointed to by the HostInfo is in normal memory.
296 Hence if we read the monList before forking, we are
297 protected from the parent servicing other requests
298 that modify the list.
302 sm_notify_1_svc(stat_chge
*arg
, __unused
struct svc_req
*req
)
304 struct timeval timeout
= { 20, 0 }; /* 20 secs timeout */
307 sm_status tx_arg
; /* arg sent to callback procedure */
312 if (debug
) syslog(LOG_DEBUG
, "notify from host %s, new state %d",
313 arg
->mon_name
, arg
->state
);
315 hp
= find_host(arg
->mon_name
, FALSE
);
318 /* Never heard of this host - why is it notifying us? */
319 syslog(LOG_ERR
, "Unsolicited notification from host %s", arg
->mon_name
);
323 if (!lp
) return (&dummy
); /* We know this host, but have no */
324 /* outstanding requests. */
328 syslog(LOG_ERR
, "Unable to fork notify process - %s", strerror(errno
));
331 if (pid
) return (&dummy
); /* Parent returns */
335 tx_arg
.mon_name
= arg
->mon_name
;
336 tx_arg
.state
= arg
->state
;
337 memcpy(tx_arg
.priv
, lp
->notifyData
, sizeof(tx_arg
.priv
));
338 cli
= clnt_create(lp
->notifyHost
, lp
->notifyProg
, lp
->notifyVers
, "udp");
341 syslog(LOG_ERR
, "Failed to contact host %s%s", lp
->notifyHost
,
342 clnt_spcreateerror(""));
346 if (clnt_call(cli
, lp
->notifyProc
, (xdrproc_t
)xdr_sm_status
, &tx_arg
,
347 (xdrproc_t
)xdr_void
, &dummy
, timeout
) != RPC_SUCCESS
)
349 syslog(LOG_ERR
, "Failed to call rpc.statd client at host %s",
357 exit (0); /* Child quits */