GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/rpc.statd/procs.c Lines: 0 126 0.0 %
Date: 2017-11-07 Branches: 0 68 0.0 %

Line Branch Exec Source
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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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}