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/* $OpenBSD: procs.c,v 1.3 2017/01/21 08:33:51 krw 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 <errno.h> |
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#include <netdb.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 <syslog.h> |
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#include <signal.h> |
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#include <unistd.h> |
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#include <rpc/rpc.h> |
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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 * |
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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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NO_ALARM; |
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if (debug) |
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syslog(LOG_DEBUG, "stat called for host %s", arg->mon_name); |
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if (gethostbyname(arg->mon_name)) |
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res.res_stat = stat_succ; |
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else { |
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syslog(LOG_ERR, "invalid hostname to sm_stat: %s", |
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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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ALARM; |
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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 * |
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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, h; |
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MonList *lp; |
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NO_ALARM; |
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if (debug) { |
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syslog(LOG_DEBUG, "monitor request for host %s", |
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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.my_id.my_name, arg->mon_id.my_id.my_prog, |
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arg->mon_id.my_id.my_vers, 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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/* |
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* Find existing host entry, or create one if not found. If |
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* find_host() fails, it will have logged the error already. |
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*/ |
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if (!gethostbyname(arg->mon_id.mon_name)) { |
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syslog(LOG_ERR, "Invalid hostname to sm_mon: %s", |
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arg->mon_id.mon_name); |
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return &res; |
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} |
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if ((hp = find_host(arg->mon_id.mon_name, &h)) == NULL) |
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memset(hp = &h, 0, sizeof(h)); |
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lp = malloc(sizeof(MonList)); |
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if (!lp) |
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syslog(LOG_ERR, "Out of memory"); |
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else { |
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strncpy(lp->notifyHost, arg->mon_id.my_id.my_name, |
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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, |
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sizeof(lp->notifyData)); |
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lp->next = hp->monList; |
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hp->monList = lp; |
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change_host(arg->mon_id.mon_name, hp); |
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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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ALARM; |
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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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int |
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do_unmon(char *name, HostInfo *hp, void *ptr) |
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{ |
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my_id *idp = ptr; |
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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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if (!strncasecmp(idp->my_name, lp->notifyHost, SM_MAXSTRLEN) |
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&& (idp->my_prog == lp->notifyProg) |
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&& (idp->my_proc == lp->notifyProc) |
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&& (idp->my_vers == lp->notifyVers)) { |
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/* found one. Unhook from chain and free. */ |
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next = lp->next; |
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if (last) |
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last->next = next; |
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else |
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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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} else { |
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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 * |
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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, h; |
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NO_ALARM; |
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if (debug) { |
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syslog(LOG_DEBUG, "un-monitor request for host %s", |
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arg->mon_name); |
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syslog(LOG_DEBUG, "recall host: %s prog: %d ver: %d proc: %d", |
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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, &h)) != NULL) { |
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if (do_unmon(arg->mon_name, hp, &arg->my_id)) { |
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change_host(arg->mon_name, hp); |
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sync_file(); |
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} else |
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syslog(LOG_ERR, |
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"unmon request from %s, no matching monitor", |
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arg->my_id.my_name); |
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} else |
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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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ALARM; |
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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 * |
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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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NO_ALARM; |
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if (debug) { |
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syslog(LOG_DEBUG, |
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"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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unmon_hosts(); |
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sync_file(); |
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res.state = status_info.ourState; |
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ALARM; |
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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 * |
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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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NO_ALARM; |
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if (debug) |
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syslog(LOG_DEBUG, "simu_crash called!!"); |
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reset_database(); |
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ALARM; |
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notify_handler(0); |
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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 * |
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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, h; |
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pid_t pid; |
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if (debug) |
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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, &h); |
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if (!hp) { |
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/* Never heard of this host - why is it notifying us? */ |
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syslog(LOG_DEBUG, "Unsolicited notification from host %s", |
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arg->mon_name); |
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return (&dummy); |
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} |
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lp = hp->monList; |
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if (!lp) /* We know this host, but have no outstanding requests. */ |
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return (&dummy); |
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sync_file(); |
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pid = fork(); |
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if (pid == -1) { |
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syslog(LOG_ERR, "Unable to fork notify process - %s", |
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strerror(errno)); |
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return (FALSE); |
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} |
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if (pid) |
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return (&dummy); /* Parent returns */ |
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while (lp) { |
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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, |
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lp->notifyVers, "udp"); |
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if (!cli) |
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syslog(LOG_ERR, "Failed to contact host %s%s", |
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lp->notifyHost, clnt_spcreateerror("")); |
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else { |
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if (clnt_call(cli, lp->notifyProc, xdr_status, &tx_arg, |
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xdr_void, &dummy, timeout) != RPC_SUCCESS) |
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syslog(LOG_ERR, |
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"Failed to call rpc.statd client at host %s", |
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lp->notifyHost); |
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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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} |