356 lines
10 KiB
C
356 lines
10 KiB
C
/*
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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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#ifndef lint
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static const char rcsid[] =
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"$Id$";
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#endif /* not lint */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <rpc/rpc.h>
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#include <syslog.h>
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#include <netdb.h> /* for gethostbyname() */
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#include "statd.h"
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/* sm_stat_1 --------------------------------------------------------------- */
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/*
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Purpose: RPC call to enquire if a host can be monitored
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Returns: TRUE for any hostname that can be looked up to give
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an address.
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*/
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struct sm_stat_res *sm_stat_1_svc(sm_name *arg, struct svc_req *req)
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{
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static sm_stat_res res;
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if (debug) syslog(LOG_DEBUG, "stat called for host %s", arg->mon_name);
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if (gethostbyname(arg->mon_name)) res.res_stat = stat_succ;
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else
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{
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syslog(LOG_ERR, "invalid hostname to sm_stat: %s", arg->mon_name);
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res.res_stat = stat_fail;
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}
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res.state = status_info->ourState;
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return (&res);
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}
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/* sm_mon_1 ---------------------------------------------------------------- */
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/*
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Purpose: RPC procedure to establish a monitor request
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Returns: Success, unless lack of resources prevents
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the necessary structures from being set up
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to record the request, or if the hostname is not
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valid (as judged by gethostbyname())
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*/
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struct sm_stat_res *sm_mon_1_svc(mon *arg, struct svc_req *req)
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{
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static sm_stat_res res;
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HostInfo *hp;
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MonList *lp;
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if (debug)
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{
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syslog(LOG_DEBUG, "monitor request for host %s", arg->mon_id.mon_name);
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syslog(LOG_DEBUG, "recall host: %s prog: %d ver: %d proc: %d",
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arg->mon_id.mon_name, arg->mon_id.my_id.my_name,
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arg->mon_id.my_id.my_prog, arg->mon_id.my_id.my_vers,
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arg->mon_id.my_id.my_proc);
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}
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res.res_stat = stat_fail; /* Assume fail until set otherwise */
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res.state = status_info->ourState;
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/* Find existing host entry, or create one if not found */
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/* If find_host() fails, it will have logged the error already. */
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if (!gethostbyname(arg->mon_id.mon_name))
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{
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syslog(LOG_ERR, "Invalid hostname to sm_mon: %s", arg->mon_id.mon_name);
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}
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else if ((hp = find_host(arg->mon_id.mon_name, TRUE)))
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{
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lp = (MonList *)malloc(sizeof(MonList));
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if (!lp)
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{
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syslog(LOG_ERR, "Out of memory");
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}
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else
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{
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strncpy(lp->notifyHost, arg->mon_id.my_id.my_name, SM_MAXSTRLEN);
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lp->notifyProg = arg->mon_id.my_id.my_prog;
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lp->notifyVers = arg->mon_id.my_id.my_vers;
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lp->notifyProc = arg->mon_id.my_id.my_proc;
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memcpy(lp->notifyData, arg->priv, sizeof(lp->notifyData));
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lp->next = hp->monList;
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hp->monList = lp;
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sync_file();
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res.res_stat = stat_succ; /* Report success */
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}
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}
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return (&res);
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}
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/* do_unmon ---------------------------------------------------------------- */
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/*
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Purpose: Remove a monitor request from a host
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Returns: TRUE if found, FALSE if not found.
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Notes: Common code from sm_unmon_1_svc and sm_unmon_all_1_svc
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In the unlikely event of more than one identical monitor
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request, all are removed.
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*/
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static int do_unmon(HostInfo *hp, my_id *idp)
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{
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MonList *lp, *next;
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MonList *last = NULL;
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int result = FALSE;
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lp = hp->monList;
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while (lp)
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{
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if (!strncasecmp(idp->my_name, lp->notifyHost, SM_MAXSTRLEN)
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&& (idp->my_prog == lp->notifyProg) && (idp->my_proc == lp->notifyProc)
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&& (idp->my_vers == lp->notifyVers))
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{
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/* found one. Unhook from chain and free. */
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next = lp->next;
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if (last) last->next = next;
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else hp->monList = next;
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free(lp);
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lp = next;
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result = TRUE;
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}
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else
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{
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last = lp;
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lp = lp->next;
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}
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}
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return (result);
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}
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/* sm_unmon_1 -------------------------------------------------------------- */
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/*
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Purpose: RPC procedure to release a monitor request.
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Returns: Local machine's status number
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Notes: The supplied mon_id should match the value passed in an
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earlier call to sm_mon_1
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*/
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struct sm_stat *sm_unmon_1_svc(mon_id *arg, struct svc_req *req)
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{
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static sm_stat res;
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HostInfo *hp;
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if (debug)
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{
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syslog(LOG_DEBUG, "un-monitor request for host %s", arg->mon_name);
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syslog(LOG_DEBUG, "recall host: %s prog: %d ver: %d proc: %d",
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arg->mon_name, arg->my_id.my_name, arg->my_id.my_prog,
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arg->my_id.my_vers, arg->my_id.my_proc);
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}
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if ((hp = find_host(arg->mon_name, FALSE)))
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{
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if (do_unmon(hp, &arg->my_id)) sync_file();
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else
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{
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syslog(LOG_ERR, "unmon request from %s, no matching monitor",
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arg->my_id.my_name);
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}
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}
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else syslog(LOG_ERR, "unmon request from %s for unknown host %s",
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arg->my_id.my_name, arg->mon_name);
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res.state = status_info->ourState;
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return (&res);
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}
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/* sm_unmon_all_1 ---------------------------------------------------------- */
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/*
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Purpose: RPC procedure to release monitor requests.
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Returns: Local machine's status number
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Notes: Releases all monitor requests (if any) from the specified
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host and program number.
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*/
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struct sm_stat *sm_unmon_all_1_svc(my_id *arg, struct svc_req *req)
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{
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static sm_stat res;
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HostInfo *hp;
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int i;
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if (debug)
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{
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syslog(LOG_DEBUG, "unmon_all for host: %s prog: %d ver: %d proc: %d",
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arg->my_name, arg->my_prog, arg->my_vers, arg->my_proc);
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}
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for (i = status_info->noOfHosts, hp = status_info->hosts; i; i--, hp++)
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{
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do_unmon(hp, arg);
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}
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sync_file();
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res.state = status_info->ourState;
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return (&res);
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}
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/* sm_simu_crash_1 --------------------------------------------------------- */
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/*
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Purpose: RPC procedure to simulate a crash
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Returns: Nothing
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Notes: Standardised mechanism for debug purposes
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The specification says that we should drop all of our
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status information (apart from the list of monitored hosts
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on disc). However, this would confuse the rpc.lockd
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which would be unaware that all of its monitor requests
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had been silently junked. Hence we in fact retain all
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current requests and simply increment the status counter
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and inform all hosts on the monitor list.
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*/
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void *sm_simu_crash_1_svc(void *v, struct svc_req *req)
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{
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static char dummy;
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int work_to_do;
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HostInfo *hp;
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int i;
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if (debug) syslog(LOG_DEBUG, "simu_crash called!!");
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/* Simulate crash by setting notify-required flag on all monitored */
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/* hosts, and incrementing our status number. notify_hosts() is */
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/* then called to fork a process to do the notifications. */
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for (i = status_info->noOfHosts, hp = status_info->hosts; i ; i--, hp++)
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{
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if (hp->monList)
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{
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work_to_do = TRUE;
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hp->notifyReqd = TRUE;
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}
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}
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status_info->ourState += 2; /* always even numbers if not crashed */
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if (work_to_do) notify_hosts();
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return (&dummy);
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}
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/* sm_notify_1 ------------------------------------------------------------- */
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/*
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Purpose: RPC procedure notifying local statd of the crash of another
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Returns: Nothing
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Notes: There is danger of deadlock, since it is quite likely that
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the client procedure that we call will in turn call us
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to remove or adjust the monitor request.
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We therefore fork() a process to do the notifications.
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Note that the main HostInfo structure is in a mmap()
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region and so will be shared with the child, but the
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monList pointed to by the HostInfo is in normal memory.
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Hence if we read the monList before forking, we are
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protected from the parent servicing other requests
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that modify the list.
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*/
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void *sm_notify_1_svc(stat_chge *arg, struct svc_req *req)
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{
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struct timeval timeout = { 20, 0 }; /* 20 secs timeout */
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CLIENT *cli;
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static char dummy;
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status tx_arg; /* arg sent to callback procedure */
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MonList *lp;
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HostInfo *hp;
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pid_t pid;
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if (debug) syslog(LOG_DEBUG, "notify from host %s, new state %d",
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arg->mon_name, arg->state);
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hp = find_host(arg->mon_name, FALSE);
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if (!hp)
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{
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/* Never heard of this host - why is it notifying us? */
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syslog(LOG_ERR, "Unsolicited notification from host %s", arg->mon_name);
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return;
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}
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lp = hp->monList;
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if (!lp) return (FALSE); /* We know this host, but have no */
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/* outstanding requests. */
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pid = fork();
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if (pid == -1)
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{
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syslog(LOG_ERR, "Unable to fork notify process - %s", strerror(errno));
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return;
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}
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if (pid) return (&dummy); /* Parent returns */
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while (lp)
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{
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tx_arg.mon_name = arg->mon_name;
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tx_arg.state = arg->state;
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memcpy(tx_arg.priv, lp->notifyData, sizeof(tx_arg.priv));
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cli = clnt_create(lp->notifyHost, lp->notifyProg, lp->notifyVers, "udp");
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if (!cli)
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{
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syslog(LOG_ERR, "Failed to contact host %s%s", lp->notifyHost,
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clnt_spcreateerror(""));
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}
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else
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{
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if (clnt_call(cli, lp->notifyProc, xdr_status, &tx_arg, xdr_void, &dummy,
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timeout) != RPC_SUCCESS)
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{
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syslog(LOG_ERR, "Failed to call rpc.statd client at host %s",
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lp->notifyHost);
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}
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clnt_destroy(cli);
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}
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lp = lp->next;
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}
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exit (0); /* Child quits */
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}
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