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https://git.openldap.org/openldap/openldap.git
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354 lines
7.6 KiB
C
354 lines
7.6 KiB
C
/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 1998-2004 The OpenLDAP Foundation.
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* 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 only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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/* Portions Copyright (c) 1996 Regents of the University of Michigan.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and that due credit is given
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* to the University of Michigan at Ann Arbor. The name of the University
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* may not be used to endorse or promote products derived from this
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* software without specific prior written permission. This software
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* is provided ``as is'' without express or implied warranty.
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*/
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/* ACKNOWLEDGEMENTS:
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* This work was originally developed by the University of Michigan
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* (as part of U-MICH LDAP).
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*/
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/*
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* st.c - routines for managing the status structure, and for reading and
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* writing status information to disk.
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/stdlib.h>
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#include <ac/string.h>
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#include <ac/unistd.h>
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#include "slurp.h"
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#include "globals.h"
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/*
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* Add information about replica host specified by Ri to list
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* of hosts.
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*/
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static Stel *
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St_add(
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St *st,
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Ri *ri
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)
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{
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int ind;
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if ( st == NULL || ri == NULL ) {
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return NULL;
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}
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/* Serialize access to the St struct */
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ldap_pvt_thread_mutex_lock( &(st->st_mutex ));
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st->st_nreplicas++;
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ind = st->st_nreplicas - 1;
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st->st_data = ( Stel ** ) ch_realloc( st->st_data,
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( st->st_nreplicas * sizeof( Stel * )));
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if ( st->st_data == NULL ) {
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ldap_pvt_thread_mutex_unlock( &(st->st_mutex ));
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return NULL;
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}
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st->st_data[ ind ] = ( Stel * ) ch_malloc( sizeof( Stel ) );
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if ( st->st_data[ ind ] == NULL ) {
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ldap_pvt_thread_mutex_unlock( &(st->st_mutex ));
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return NULL;
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}
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st->st_data[ ind ]->hostname = strdup( ri->ri_hostname );
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st->st_data[ ind ]->port = ri->ri_port;
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st->st_data[ ind ]->last = 0;
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st->st_data[ ind ]->seq = 0;
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ldap_pvt_thread_mutex_unlock( &(st->st_mutex ));
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return st->st_data[ ind ];
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}
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/*
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* Write the contents of an St to disk.
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*/
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static int
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St_write (
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St *st
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)
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{
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int rc;
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Stel *stel;
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int i;
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if ( st == NULL ) {
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return -1;
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}
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ldap_pvt_thread_mutex_lock( &(st->st_mutex ));
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if ( st->st_fp == NULL ) {
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/* Open file */
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if (( rc = acquire_lock( sglob->slurpd_status_file, &(st->st_fp),
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&(st->st_lfp))) < 0 ) {
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if ( !st->st_err_logged ) {
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#ifdef NEW_LOGGING
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LDAP_LOG ( SLURPD, ERR, "St_write: "
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"Error: cannot open status file \"%s\":%s\n",
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sglob->slurpd_status_file, sys_errlist[ errno ], 0 );
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#else
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Debug( LDAP_DEBUG_ANY,
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"Error: cannot open status file \"%s\": %s\n",
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sglob->slurpd_status_file, sys_errlist[ errno ], 0 );
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#endif
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st->st_err_logged = 1;
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ldap_pvt_thread_mutex_unlock( &(st->st_mutex ));
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return -1;
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}
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} else {
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st->st_err_logged = 0;
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}
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}
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/* Write data to the file */
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truncate( sglob->slurpd_status_file, 0L );
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fseek( st->st_fp, 0L, 0 );
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for ( i = 0; i < st->st_nreplicas; i++ ) {
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stel = st->st_data[ i ];
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fprintf( st->st_fp, "%s:%d:%ld:%d\n",
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stel->hostname, stel->port,
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(long) stel->last, stel->seq );
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}
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fflush( st->st_fp );
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ldap_pvt_thread_mutex_unlock( &(st->st_mutex ));
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return 0;
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}
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/*
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* Update the entry for a given host.
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*/
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static int
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St_update(
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St *st,
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Stel *stel,
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Re *re
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)
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{
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if ( stel == NULL || re == NULL ) {
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return -1;
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}
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ldap_pvt_thread_mutex_lock( &(st->st_mutex ));
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stel->last = re->re_timestamp;
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stel->seq = re->re_seq;
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ldap_pvt_thread_mutex_unlock( &(st->st_mutex ));
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return 0;
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}
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/*
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* Read status information from disk file.
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*/
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static int
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St_read(
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St *st
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)
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{
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FILE *fp;
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FILE *lfp;
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char buf[ 255 ];
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int i;
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int rc;
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char *hostname, *port, *timestamp, *seq, *p, *t;
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int found;
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if ( st == NULL ) {
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return -1;
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}
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ldap_pvt_thread_mutex_lock( &(st->st_mutex ));
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if ( access( sglob->slurpd_status_file, F_OK ) < 0 ) {
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/*
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* File doesn't exist, so create it and return.
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*/
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if (( fp = fopen( sglob->slurpd_status_file, "w" )) == NULL ) {
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#ifdef NEW_LOGGING
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LDAP_LOG ( SLURPD, ERR, "St_write: "
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"Error: cannot create status file \"%s\"\n",
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sglob->slurpd_status_file, 0, 0 );
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#else
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Debug( LDAP_DEBUG_ANY, "Error: cannot create status file \"%s\"\n",
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sglob->slurpd_status_file, 0, 0 );
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#endif
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ldap_pvt_thread_mutex_unlock( &(st->st_mutex ));
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return -1;
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}
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(void) fclose( fp );
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ldap_pvt_thread_mutex_unlock( &(st->st_mutex ));
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#ifdef NEW_LOGGING
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LDAP_LOG ( SLURPD, DETAIL1, "St_write: "
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"No status file found, defaulting values\n", 0, 0, 0 );
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#else
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Debug( LDAP_DEBUG_ARGS, "No status file found, defaulting values\n",
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0, 0, 0 );
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#endif
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return 0;
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}
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if (( rc = acquire_lock( sglob->slurpd_status_file, &fp, &lfp)) < 0 ) {
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ldap_pvt_thread_mutex_unlock( &(st->st_mutex ));
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return 0;
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}
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while ( fgets( buf, sizeof( buf ), fp ) != NULL ) {
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p = buf;
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hostname = p;
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if (( t = strchr( p, ':' )) == NULL ) {
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goto bad;
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}
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*t++ = '\0';
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p = t;
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port = p;
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if (( t = strchr( p, ':' )) == NULL ) {
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goto bad;
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}
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*t++ = '\0';
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p = t;
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timestamp = p;
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if (( t = strchr( p, ':' )) == NULL ) {
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goto bad;
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}
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*t++ = '\0';
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seq = t;
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if (( t = strchr( seq, '\n' )) != NULL ) {
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*t = '\0';
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}
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found = 0;
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for ( i = 0; i < sglob->st->st_nreplicas; i++ ) {
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if ( !strcmp( hostname, sglob->st->st_data[ i ]->hostname ) &&
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atoi( port ) == sglob->st->st_data[ i ]->port ) {
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found = 1;
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sglob->st->st_data[ i ]->last = atol( timestamp );
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sglob->st->st_data[ i ]->seq = atoi( seq );
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break;
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}
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}
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if ( found ) {
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char tbuf[ 255 ];
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sprintf( tbuf, "%s:%s (timestamp %s.%s)", hostname, port,
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timestamp, seq );
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#ifdef NEW_LOGGING
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LDAP_LOG ( SLURPD, DETAIL1, "St_write: "
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"Retrieved state information for %s\n", tbuf, 0, 0 );
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#else
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Debug( LDAP_DEBUG_ARGS,
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"Retrieved state information for %s\n", tbuf, 0, 0 );
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#endif
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} else {
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#ifdef NEW_LOGGING
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LDAP_LOG ( SLURPD, WARNING, "St_write: "
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"Warning: saved state for %s:%s, not a known replica\n",
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hostname, port, 0 );
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#else
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Debug( LDAP_DEBUG_ANY,
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"Warning: saved state for %s:%s, not a known replica\n",
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hostname, port, 0 );
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#endif
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}
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}
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(void) relinquish_lock( sglob->slurpd_status_file, fp, lfp);
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ldap_pvt_thread_mutex_unlock( &(st->st_mutex ));
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return 0;
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bad:
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(void) relinquish_lock( sglob->slurpd_status_file, fp, lfp);
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ldap_pvt_thread_mutex_unlock( &(st->st_mutex ));
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return -1;
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}
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/*
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* Lock an St struct.
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*/
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static int
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St_lock(
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St *st
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)
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{
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return( ldap_pvt_thread_mutex_lock( &st->st_mutex ));
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}
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/*
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* Lock an St struct.
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*/
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static int
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St_unlock(
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St *st
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)
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{
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return( ldap_pvt_thread_mutex_unlock( &st->st_mutex ));
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}
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/*
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* Allocate and initialize an St struct.
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*/
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int
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St_init(
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St **st
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)
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{
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if ( st == NULL ) {
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return -1;
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}
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(*st) = (St *) malloc( sizeof( St ));
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if ( *st == NULL ) {
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return -1;
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}
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ldap_pvt_thread_mutex_init( &((*st)->st_mutex) );
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(*st)->st_data = NULL;
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(*st)->st_fp = NULL;
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(*st)->st_lfp = NULL;
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(*st)->st_nreplicas = 0;
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(*st)->st_err_logged = 0;
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(*st)->st_update = St_update;
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(*st)->st_add = St_add;
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(*st)->st_write = St_write;
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(*st)->st_read = St_read;
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(*st)->st_lock = St_lock;
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(*st)->st_unlock = St_unlock;
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return 0;
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}
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