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
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14 * must display the following acknowledgement:
15 * This product includes software developed for the FreeBSD project
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18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY ANDREW GORDON AND CONTRIBUTORS ``AS IS'' AND
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32 * $FreeBSD: src/usr.sbin/rpc.statd/procs.c,v 1.4.2.2 2002/07/11 17:41:28 alfred Exp $
33 * $DragonFly: src/usr.sbin/rpc.statd/procs.c,v 1.2 2003/06/17 04:30:02 dillon Exp $
43 #include <netdb.h> /* for gethostbyname() */
47 /* sm_stat_1 --------------------------------------------------------------- */
49 Purpose: RPC call to enquire if a host can be monitored
50 Returns: TRUE for any hostname that can be looked up to give
54 struct sm_stat_res *sm_stat_1_svc(sm_name *arg, 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())
80 struct sm_stat_res *sm_mon_1_svc(mon *arg, struct svc_req *req)
82 static sm_stat_res res;
88 syslog(LOG_DEBUG, "monitor request for host %s", arg->mon_id.mon_name);
89 syslog(LOG_DEBUG, "recall host: %s prog: %d ver: %d proc: %d",
90 arg->mon_id.mon_name, arg->mon_id.my_id.my_name,
91 arg->mon_id.my_id.my_prog, arg->mon_id.my_id.my_vers,
92 arg->mon_id.my_id.my_proc);
95 res.res_stat = stat_fail; /* Assume fail until set otherwise */
96 res.state = status_info->ourState;
98 /* Find existing host entry, or create one if not found */
99 /* If find_host() fails, it will have logged the error already. */
100 if (!gethostbyname(arg->mon_id.mon_name))
102 syslog(LOG_ERR, "Invalid hostname to sm_mon: %s", arg->mon_id.mon_name);
104 else if ((hp = find_host(arg->mon_id.mon_name, TRUE)))
106 lp = (MonList *)malloc(sizeof(MonList));
109 syslog(LOG_ERR, "Out of memory");
113 strncpy(lp->notifyHost, arg->mon_id.my_id.my_name, SM_MAXSTRLEN);
114 lp->notifyProg = arg->mon_id.my_id.my_prog;
115 lp->notifyVers = arg->mon_id.my_id.my_vers;
116 lp->notifyProc = arg->mon_id.my_id.my_proc;
117 memcpy(lp->notifyData, arg->priv, sizeof(lp->notifyData));
119 lp->next = hp->monList;
123 res.res_stat = stat_succ; /* Report success */
130 /* do_unmon ---------------------------------------------------------------- */
132 Purpose: Remove a monitor request from a host
133 Returns: TRUE if found, FALSE if not found.
134 Notes: Common code from sm_unmon_1_svc and sm_unmon_all_1_svc
135 In the unlikely event of more than one identical monitor
136 request, all are removed.
139 static int do_unmon(HostInfo *hp, my_id *idp)
142 MonList *last = NULL;
148 if (!strncasecmp(idp->my_name, lp->notifyHost, SM_MAXSTRLEN)
149 && (idp->my_prog == lp->notifyProg) && (idp->my_proc == lp->notifyProc)
150 && (idp->my_vers == lp->notifyVers))
152 /* found one. Unhook from chain and free. */
154 if (last) last->next = next;
155 else hp->monList = next;
169 /* sm_unmon_1 -------------------------------------------------------------- */
171 Purpose: RPC procedure to release a monitor request.
172 Returns: Local machine's status number
173 Notes: The supplied mon_id should match the value passed in an
174 earlier call to sm_mon_1
177 struct sm_stat *sm_unmon_1_svc(mon_id *arg, struct svc_req *req)
184 syslog(LOG_DEBUG, "un-monitor request for host %s", arg->mon_name);
185 syslog(LOG_DEBUG, "recall host: %s prog: %d ver: %d proc: %d",
186 arg->mon_name, arg->my_id.my_name, arg->my_id.my_prog,
187 arg->my_id.my_vers, arg->my_id.my_proc);
190 if ((hp = find_host(arg->mon_name, FALSE)))
192 if (do_unmon(hp, &arg->my_id)) sync_file();
195 syslog(LOG_ERR, "unmon request from %s, no matching monitor",
199 else syslog(LOG_ERR, "unmon request from %s for unknown host %s",
200 arg->my_id.my_name, arg->mon_name);
202 res.state = status_info->ourState;
207 /* sm_unmon_all_1 ---------------------------------------------------------- */
209 Purpose: RPC procedure to release monitor requests.
210 Returns: Local machine's status number
211 Notes: Releases all monitor requests (if any) from the specified
212 host and program number.
215 struct sm_stat *sm_unmon_all_1_svc(my_id *arg, struct svc_req *req)
223 syslog(LOG_DEBUG, "unmon_all for host: %s prog: %d ver: %d proc: %d",
224 arg->my_name, arg->my_prog, arg->my_vers, arg->my_proc);
227 for (i = status_info->noOfHosts, hp = status_info->hosts; i; i--, hp++)
233 res.state = status_info->ourState;
238 /* sm_simu_crash_1 --------------------------------------------------------- */
240 Purpose: RPC procedure to simulate a crash
242 Notes: Standardised mechanism for debug purposes
243 The specification says that we should drop all of our
244 status information (apart from the list of monitored hosts
245 on disc). However, this would confuse the rpc.lockd
246 which would be unaware that all of its monitor requests
247 had been silently junked. Hence we in fact retain all
248 current requests and simply increment the status counter
249 and inform all hosts on the monitor list.
252 void *sm_simu_crash_1_svc(void *v, struct svc_req *req)
259 if (debug) syslog(LOG_DEBUG, "simu_crash called!!");
261 /* Simulate crash by setting notify-required flag on all monitored */
262 /* hosts, and incrementing our status number. notify_hosts() is */
263 /* then called to fork a process to do the notifications. */
265 for (i = status_info->noOfHosts, hp = status_info->hosts; i ; i--, hp++)
270 hp->notifyReqd = TRUE;
273 status_info->ourState += 2; /* always even numbers if not crashed */
275 if (work_to_do) notify_hosts();
280 /* sm_notify_1 ------------------------------------------------------------- */
282 Purpose: RPC procedure notifying local statd of the crash of another
284 Notes: There is danger of deadlock, since it is quite likely that
285 the client procedure that we call will in turn call us
286 to remove or adjust the monitor request.
287 We therefore fork() a process to do the notifications.
288 Note that the main HostInfo structure is in a mmap()
289 region and so will be shared with the child, but the
290 monList pointed to by the HostInfo is in normal memory.
291 Hence if we read the monList before forking, we are
292 protected from the parent servicing other requests
293 that modify the list.
296 void *sm_notify_1_svc(stat_chge *arg, struct svc_req *req)
298 struct timeval timeout = { 20, 0 }; /* 20 secs timeout */
301 sm_status tx_arg; /* arg sent to callback procedure */
306 if (debug) syslog(LOG_DEBUG, "notify from host %s, new state %d",
307 arg->mon_name, arg->state);
309 hp = find_host(arg->mon_name, FALSE);
312 /* Never heard of this host - why is it notifying us? */
313 syslog(LOG_ERR, "Unsolicited notification from host %s", arg->mon_name);
317 if (!lp) return (&dummy); /* We know this host, but have no */
318 /* outstanding requests. */
322 syslog(LOG_ERR, "Unable to fork notify process - %s", strerror(errno));
325 if (pid) return (&dummy); /* Parent returns */
329 tx_arg.mon_name = arg->mon_name;
330 tx_arg.state = arg->state;
331 memcpy(tx_arg.priv, lp->notifyData, sizeof(tx_arg.priv));
332 cli = clnt_create(lp->notifyHost, lp->notifyProg, lp->notifyVers, "udp");
335 syslog(LOG_ERR, "Failed to contact host %s%s", lp->notifyHost,
336 clnt_spcreateerror(""));
340 if (clnt_call(cli, lp->notifyProc, xdr_sm_status, &tx_arg, xdr_void, &dummy,
341 timeout) != RPC_SUCCESS)
343 syslog(LOG_ERR, "Failed to call rpc.statd client at host %s",
351 exit (0); /* Child quits */