366 lines
10 KiB
C
366 lines
10 KiB
C
/* $NetBSD: stat_proc.c,v 1.4 1997/10/21 20:38:03 christos Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1995
|
|
* A.R. Gordon (andrew.gordon@net-tel.co.uk). All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed for the FreeBSD project
|
|
* 4. Neither the name of the author nor the names of any co-contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY ANDREW GORDON AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
__RCSID("$NetBSD: stat_proc.c,v 1.4 1997/10/21 20:38:03 christos Exp $");
|
|
#endif
|
|
|
|
#include <errno.h>
|
|
#include <netdb.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <syslog.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
|
|
#include <rpc/rpc.h>
|
|
|
|
#include "statd.h"
|
|
|
|
/* sm_stat_1 --------------------------------------------------------------- */
|
|
/*
|
|
* Purpose: RPC call to enquire if a host can be monitored
|
|
* Returns: TRUE for any hostname that can be looked up to give
|
|
* an address.
|
|
*/
|
|
struct sm_stat_res *
|
|
sm_stat_1_svc(arg, req)
|
|
sm_name *arg;
|
|
struct svc_req *req;
|
|
{
|
|
static sm_stat_res res;
|
|
|
|
NO_ALARM;
|
|
if (debug)
|
|
syslog(LOG_DEBUG, "stat called for host %s", arg->mon_name);
|
|
|
|
if (gethostbyname(arg->mon_name))
|
|
res.res_stat = stat_succ;
|
|
else {
|
|
syslog(LOG_ERR, "invalid hostname to sm_stat: %s",
|
|
arg->mon_name);
|
|
res.res_stat = stat_fail;
|
|
}
|
|
|
|
res.state = status_info.ourState;
|
|
ALARM;
|
|
return (&res);
|
|
}
|
|
|
|
/* sm_mon_1 ---------------------------------------------------------------- */
|
|
/*
|
|
* Purpose: RPC procedure to establish a monitor request
|
|
* Returns: Success, unless lack of resources prevents
|
|
* the necessary structures from being set up
|
|
* to record the request, or if the hostname is not
|
|
* valid (as judged by gethostbyname())
|
|
*/
|
|
struct sm_stat_res *
|
|
sm_mon_1_svc(arg, req)
|
|
mon *arg;
|
|
struct svc_req *req;
|
|
{
|
|
static sm_stat_res res;
|
|
HostInfo *hp, h;
|
|
MonList *lp;
|
|
|
|
NO_ALARM;
|
|
if (debug) {
|
|
syslog(LOG_DEBUG, "monitor request for host %s",
|
|
arg->mon_id.mon_name);
|
|
syslog(LOG_DEBUG, "recall host: %s prog: %d ver: %d proc: %d",
|
|
arg->mon_id.my_id.my_name, arg->mon_id.my_id.my_prog,
|
|
arg->mon_id.my_id.my_vers, arg->mon_id.my_id.my_proc);
|
|
}
|
|
res.res_stat = stat_fail; /* Assume fail until set otherwise */
|
|
res.state = status_info.ourState;
|
|
|
|
/*
|
|
* Find existing host entry, or create one if not found. If
|
|
* find_host() fails, it will have logged the error already.
|
|
*/
|
|
if (!gethostbyname(arg->mon_id.mon_name)) {
|
|
syslog(LOG_ERR, "Invalid hostname to sm_mon: %s",
|
|
arg->mon_id.mon_name);
|
|
return &res;
|
|
}
|
|
|
|
if ((hp = find_host(arg->mon_id.mon_name, &h)) == NULL)
|
|
memset(hp = &h, 0, sizeof(h));
|
|
|
|
lp = (MonList *)malloc(sizeof(MonList));
|
|
if (!lp)
|
|
syslog(LOG_ERR, "Out of memory");
|
|
else {
|
|
strncpy(lp->notifyHost, arg->mon_id.my_id.my_name,
|
|
SM_MAXSTRLEN);
|
|
lp->notifyProg = arg->mon_id.my_id.my_prog;
|
|
lp->notifyVers = arg->mon_id.my_id.my_vers;
|
|
lp->notifyProc = arg->mon_id.my_id.my_proc;
|
|
memcpy(lp->notifyData, arg->priv,
|
|
sizeof(lp->notifyData));
|
|
|
|
lp->next = hp->monList;
|
|
hp->monList = lp;
|
|
change_host(arg->mon_id.mon_name, hp);
|
|
sync_file();
|
|
res.res_stat = stat_succ; /* Report success */
|
|
}
|
|
ALARM;
|
|
return (&res);
|
|
}
|
|
|
|
/* do_unmon ---------------------------------------------------------------- */
|
|
/*
|
|
* Purpose: Remove a monitor request from a host
|
|
* Returns: TRUE if found, FALSE if not found.
|
|
* Notes: Common code from sm_unmon_1_svc and sm_unmon_all_1_svc
|
|
* In the unlikely event of more than one identical monitor
|
|
* request, all are removed.
|
|
*/
|
|
int
|
|
do_unmon(name, hp, ptr)
|
|
char *name;
|
|
HostInfo *hp;
|
|
void *ptr;
|
|
{
|
|
my_id *idp = ptr;
|
|
MonList *lp, *next;
|
|
MonList *last = NULL;
|
|
int result = FALSE;
|
|
|
|
lp = hp->monList;
|
|
while (lp) {
|
|
if (!strncasecmp(idp->my_name, lp->notifyHost, SM_MAXSTRLEN)
|
|
&& (idp->my_prog == lp->notifyProg)
|
|
&& (idp->my_proc == lp->notifyProc)
|
|
&& (idp->my_vers == lp->notifyVers)) {
|
|
/* found one. Unhook from chain and free. */
|
|
next = lp->next;
|
|
if (last)
|
|
last->next = next;
|
|
else
|
|
hp->monList = next;
|
|
free(lp);
|
|
lp = next;
|
|
result = TRUE;
|
|
} else {
|
|
last = lp;
|
|
lp = lp->next;
|
|
}
|
|
}
|
|
return (result);
|
|
}
|
|
|
|
/* sm_unmon_1 -------------------------------------------------------------- */
|
|
/*
|
|
* Purpose: RPC procedure to release a monitor request.
|
|
* Returns: Local machine's status number
|
|
* Notes: The supplied mon_id should match the value passed in an
|
|
* earlier call to sm_mon_1
|
|
*/
|
|
struct sm_stat *
|
|
sm_unmon_1_svc(arg, req)
|
|
mon_id *arg;
|
|
struct svc_req *req;
|
|
{
|
|
static sm_stat res;
|
|
HostInfo *hp, h;
|
|
|
|
NO_ALARM;
|
|
if (debug) {
|
|
syslog(LOG_DEBUG, "un-monitor request for host %s",
|
|
arg->mon_name);
|
|
syslog(LOG_DEBUG, "recall host: %s prog: %d ver: %d proc: %d",
|
|
arg->my_id.my_name, arg->my_id.my_prog,
|
|
arg->my_id.my_vers, arg->my_id.my_proc);
|
|
}
|
|
if ((hp = find_host(arg->mon_name, &h)) != NULL) {
|
|
if (do_unmon(arg->mon_name, hp, &arg->my_id)) {
|
|
change_host(arg->mon_name, hp);
|
|
sync_file();
|
|
}
|
|
else
|
|
syslog(LOG_ERR,
|
|
"unmon request from %s, no matching monitor",
|
|
arg->my_id.my_name);
|
|
} else
|
|
syslog(LOG_ERR, "unmon request from %s for unknown host %s",
|
|
arg->my_id.my_name, arg->mon_name);
|
|
|
|
res.state = status_info.ourState;
|
|
ALARM;
|
|
|
|
return (&res);
|
|
}
|
|
|
|
/* sm_unmon_all_1 ---------------------------------------------------------- */
|
|
/*
|
|
* Purpose: RPC procedure to release monitor requests.
|
|
* Returns: Local machine's status number
|
|
* Notes: Releases all monitor requests (if any) from the specified
|
|
* host and program number.
|
|
*/
|
|
struct sm_stat *
|
|
sm_unmon_all_1_svc(arg, req)
|
|
my_id *arg;
|
|
struct svc_req *req;
|
|
{
|
|
static sm_stat res;
|
|
|
|
NO_ALARM;
|
|
if (debug) {
|
|
syslog(LOG_DEBUG,
|
|
"unmon_all for host: %s prog: %d ver: %d proc: %d",
|
|
arg->my_name, arg->my_prog, arg->my_vers, arg->my_proc);
|
|
}
|
|
|
|
unmon_hosts();
|
|
sync_file();
|
|
|
|
res.state = status_info.ourState;
|
|
ALARM;
|
|
|
|
return (&res);
|
|
}
|
|
|
|
/* sm_simu_crash_1 --------------------------------------------------------- */
|
|
/*
|
|
* Purpose: RPC procedure to simulate a crash
|
|
* Returns: Nothing
|
|
* Notes: Standardised mechanism for debug purposes
|
|
* The specification says that we should drop all of our
|
|
* status information (apart from the list of monitored hosts
|
|
* on disc). However, this would confuse the rpc.lockd
|
|
* which would be unaware that all of its monitor requests
|
|
* had been silently junked. Hence we in fact retain all
|
|
* current requests and simply increment the status counter
|
|
* and inform all hosts on the monitor list.
|
|
*/
|
|
void *
|
|
sm_simu_crash_1_svc(v, req)
|
|
void *v;
|
|
struct svc_req *req;
|
|
{
|
|
static char dummy;
|
|
|
|
NO_ALARM;
|
|
if (debug)
|
|
syslog(LOG_DEBUG, "simu_crash called!!");
|
|
|
|
reset_database();
|
|
ALARM;
|
|
notify_handler(0);
|
|
|
|
return (&dummy);
|
|
}
|
|
|
|
/* sm_notify_1 ------------------------------------------------------------- */
|
|
/*
|
|
* Purpose: RPC procedure notifying local statd of the crash of another
|
|
* Returns: Nothing
|
|
* Notes: There is danger of deadlock, since it is quite likely that
|
|
* the client procedure that we call will in turn call us
|
|
* to remove or adjust the monitor request.
|
|
* We therefore fork() a process to do the notifications.
|
|
* Note that the main HostInfo structure is in a mmap()
|
|
* region and so will be shared with the child, but the
|
|
* monList pointed to by the HostInfo is in normal memory.
|
|
* Hence if we read the monList before forking, we are
|
|
* protected from the parent servicing other requests
|
|
* that modify the list.
|
|
*/
|
|
void *
|
|
sm_notify_1_svc(arg, req)
|
|
stat_chge *arg;
|
|
struct svc_req *req;
|
|
{
|
|
struct timeval timeout = {20, 0}; /* 20 secs timeout */
|
|
CLIENT *cli;
|
|
static char dummy;
|
|
status tx_arg; /* arg sent to callback procedure */
|
|
MonList *lp;
|
|
HostInfo *hp, h;
|
|
pid_t pid;
|
|
|
|
if (debug)
|
|
syslog(LOG_DEBUG, "notify from host %s, new state %d",
|
|
arg->mon_name, arg->state);
|
|
|
|
hp = find_host(arg->mon_name, &h);
|
|
if (!hp) {
|
|
/* Never heard of this host - why is it notifying us? */
|
|
syslog(LOG_ERR, "Unsolicited notification from host %s",
|
|
arg->mon_name);
|
|
return (FALSE);
|
|
}
|
|
lp = hp->monList;
|
|
if (!lp) /* We know this host, but have no outstanding requests. */
|
|
return (FALSE);
|
|
|
|
pid = fork();
|
|
if (pid == -1) {
|
|
syslog(LOG_ERR, "Unable to fork notify process - %s",
|
|
strerror(errno));
|
|
return (FALSE);
|
|
}
|
|
if (pid)
|
|
return (&dummy); /* Parent returns */
|
|
|
|
while (lp) {
|
|
tx_arg.mon_name = arg->mon_name;
|
|
tx_arg.state = arg->state;
|
|
memcpy(tx_arg.priv, lp->notifyData, sizeof(tx_arg.priv));
|
|
cli = clnt_create(lp->notifyHost, lp->notifyProg,
|
|
lp->notifyVers, "udp");
|
|
if (!cli)
|
|
syslog(LOG_ERR, "Failed to contact host %s%s",
|
|
lp->notifyHost, clnt_spcreateerror(""));
|
|
else {
|
|
if (clnt_call(cli, lp->notifyProc, xdr_status, &tx_arg,
|
|
xdr_void, &dummy, timeout) != RPC_SUCCESS)
|
|
syslog(LOG_ERR,
|
|
"Failed to call rpc.statd client at host %s",
|
|
lp->notifyHost);
|
|
clnt_destroy(cli);
|
|
}
|
|
lp = lp->next;
|
|
}
|
|
|
|
exit(0); /* Child quits */
|
|
}
|