openldap/servers/slurpd/replog.c

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/* $OpenLDAP$ */
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/*
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* Copyright 1998-2002 The OpenLDAP Foundation, All Rights Reserved.
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* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
*/
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/*
* Copyright (c) 1996 Regents of the University of Michigan.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of Michigan at Ann Arbor. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/
/*
* replog.c - routines which read and write replication log files.
*/
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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/errno.h>
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#include <ac/param.h>
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#include <ac/string.h>
#include <ac/syslog.h>
#include <ac/time.h>
#include <ac/unistd.h>
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#include <sys/stat.h>
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#include <fcntl.h>
#include "slurp.h"
#include "globals.h"
/*
* Copy the replication log. Returns 0 on success, 1 if a temporary
* error occurs, and -1 if a fatal error occurs.
*/
int
copy_replog(
char *src,
char *dst
)
{
int rc = 0;
FILE *rfp; /* replog fp */
FILE *lfp; /* replog lockfile fp */
FILE *dfp; /* duplicate replog fp */
FILE *dlfp; /* duplicate replog lockfile fp */
static char buf[ MAXPATHLEN ];
static char rbuf[ 1024 ];
char *p;
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#ifdef NEW_LOGGING
LDAP_LOG ( SLURPD, ARGS, "copy_replog: "
"copy replog \"%s\" to \"%s\"\n", src, dst, 0 );
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#else
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Debug( LDAP_DEBUG_ARGS,
"copy replog \"%s\" to \"%s\"\n",
src, dst, 0 );
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#endif
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/*
* Make sure the destination directory is writable. If not, exit
* with a fatal error.
*/
strcpy( buf, src );
if (( p = strrchr( buf, LDAP_DIRSEP[0] )) == NULL ) {
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strcpy( buf, "." );
} else {
*p = '\0';
}
if ( access( buf, W_OK ) < 0 ) {
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#ifdef NEW_LOGGING
LDAP_LOG ( SLURPD, ERR, "copy_replog: "
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"Error: (%ld): Directory %s is not writable\n",
(long) getpid(), buf, 0 );
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#else
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Debug( LDAP_DEBUG_ANY,
"Error: copy_replog (%ld): Directory %s is not writable\n",
(long) getpid(), buf, 0 );
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#endif
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return( -1 );
}
strcpy( buf, dst );
if (( p = strrchr( buf, LDAP_DIRSEP[0] )) == NULL ) {
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strcpy( buf, "." );
} else {
*p = '\0';
}
if ( access( buf, W_OK ) < 0 ) {
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#ifdef NEW_LOGGING
LDAP_LOG ( SLURPD, ERR, "copy_replog: "
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"Error: (%ld): Directory %s is not writable\n",
(long) getpid(), buf, 0 );
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#else
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Debug( LDAP_DEBUG_ANY,
"Error: copy_replog (%ld): Directory %s is not writable\n",
(long) getpid(), buf, 0 );
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#endif
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return( -1 );
}
/* lock src */
rfp = lock_fopen( src, "r", &lfp );
if ( rfp == NULL ) {
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#ifdef NEW_LOGGING
LDAP_LOG ( SLURPD, ERR, "copy_replog: "
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"Error: Can't lock replog \"%s\" for read: %s\n",
src, sys_errlist[ errno ], 0 );
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#else
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Debug( LDAP_DEBUG_ANY,
"Error: copy_replog: Can't lock replog \"%s\" for read: %s\n",
src, sys_errlist[ errno ], 0 );
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#endif
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return( 1 );
}
/* lock dst */
dfp = lock_fopen( dst, "a", &dlfp );
if ( dfp == NULL ) {
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#ifdef NEW_LOGGING
LDAP_LOG ( SLURPD, ERR, "copy_replog: "
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"Error: Can't lock replog \"%s\" for write: %s\n",
src, sys_errlist[ errno ], 0 );
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#else
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Debug( LDAP_DEBUG_ANY,
"Error: copy_replog: Can't lock replog \"%s\" for write: %s\n",
src, sys_errlist[ errno ], 0 );
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#endif
lock_fclose( rfp, lfp );
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return( 1 );
}
/*
* Make our own private copy of the replication log.
*/
while (( p = fgets( rbuf, sizeof( buf ), rfp )) != NULL ) {
fputs( rbuf, dfp );
}
/* Only truncate the source file if we're not in one-shot mode */
if ( !sglob->one_shot_mode ) {
/* truncate replication log */
truncate( src, (off_t) 0 );
}
if ( lock_fclose( dfp, dlfp ) == EOF ) {
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#ifdef NEW_LOGGING
LDAP_LOG ( SLURPD, ERR, "copy_replog: "
"Error: Error closing \"%s\"\n", src, 0, 0 );
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#else
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Debug( LDAP_DEBUG_ANY,
"Error: copy_replog: Error closing \"%s\"\n",
src, 0, 0 );
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#endif
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}
if ( lock_fclose( rfp, lfp ) == EOF ) {
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#ifdef NEW_LOGGING
LDAP_LOG ( SLURPD, ERR, "copy_replog: "
"Error: Error closing \"%s\"\n", src, 0, 0 );
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#else
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Debug( LDAP_DEBUG_ANY,
"Error: copy_replog: Error closing \"%s\"\n",
src, 0, 0 );
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#endif
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}
return( rc );
}
/*
* Return 1 if the given file exists and has a nonzero size,
* 0 if it is empty or nonexistent.
*/
int
file_nonempty(
char *filename
)
{
static struct stat stbuf;
if ( stat( filename, &stbuf ) < 0 ) {
return( 0 );
} else {
return( stbuf.st_size > (off_t ) 0 );
}
}