318 lines
6.2 KiB
C
318 lines
6.2 KiB
C
/* $NetBSD: ypdb.c,v 1.12 2017/01/10 21:06:17 christos Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Margo Seltzer.
|
|
*
|
|
* This code is derived from ndbm module of BSD4.4 db (hash) by
|
|
* Mats O Jansson
|
|
*
|
|
* 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. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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: ypdb.c,v 1.12 2017/01/10 21:06:17 christos Exp $");
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <db.h>
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include <rpcsvc/yp.h>
|
|
|
|
#include "ypdb.h"
|
|
|
|
static DBM *_ypdb_dbopen(const char *, int, mode_t);
|
|
|
|
/*
|
|
* ypdb_open --
|
|
* dbopen(3) file, read-only.
|
|
* First ensure that file has a suffix of YPDB_SUFFIX.
|
|
* Try opening as a DB_BTREE first, then DB_HASH.
|
|
*
|
|
* Returns:
|
|
* *DBM on success
|
|
* NULL on failure
|
|
*/
|
|
|
|
DBM *
|
|
ypdb_open(const char *file)
|
|
{
|
|
char path[MAXPATHLEN];
|
|
const char *cp, *suffix;
|
|
|
|
cp = strrchr(file, '.');
|
|
if (cp != NULL && strcmp(cp, YPDB_SUFFIX) == 0)
|
|
suffix = "";
|
|
else
|
|
suffix = YPDB_SUFFIX;
|
|
if (strlen(file) + strlen(suffix) > (sizeof(path) - 1)) {
|
|
warnx("File name `%s' is too long", file);
|
|
return (NULL);
|
|
}
|
|
snprintf(path, sizeof(path), "%s%s", file, suffix);
|
|
return _ypdb_dbopen(path, O_RDONLY, 0444);
|
|
}
|
|
|
|
/*
|
|
* ypdb_mktemp --
|
|
* Create a temporary file using mkstemp(3) based on the
|
|
* template provided in file.
|
|
* dbopen(3) file, read-write, 0644 (modified by umask(2)).
|
|
* Try opening as a DB_BTREE first, then DB_HASH.
|
|
* file won't have YPDB_SUFFIX.
|
|
*
|
|
* Returns:
|
|
* *DBM on success; file now exists.
|
|
* NULL on failure
|
|
*/
|
|
|
|
DBM *
|
|
ypdb_mktemp(char *file)
|
|
{
|
|
int fd = -1;
|
|
DBM *db = NULL;
|
|
mode_t myumask;
|
|
int save_errno;
|
|
|
|
if ((fd = mkstemp(file)) == -1)
|
|
return NULL;
|
|
|
|
myumask = umask(0);
|
|
(void)umask(myumask);
|
|
if (fchmod(fd, 0644 & ~myumask) == -1)
|
|
goto bad;
|
|
|
|
(void) close(fd);
|
|
fd = -1;
|
|
|
|
if ((db = _ypdb_dbopen(file, O_RDWR, 0644)) == NULL)
|
|
goto bad;
|
|
|
|
return db;
|
|
|
|
bad:
|
|
save_errno = errno;
|
|
if (fd != 1)
|
|
(void) close(fd);
|
|
(void) unlink(file);
|
|
errno = save_errno;
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* _ypdb_dbopen --
|
|
* dbopen(3) path with the flags & mode.
|
|
* Try opening as a DB_BTREE first, then DB_HASH.
|
|
*/
|
|
|
|
static DBM *
|
|
_ypdb_dbopen(const char *path, int flags, mode_t mode)
|
|
{
|
|
DBM *db;
|
|
BTREEINFO info;
|
|
|
|
/* try our btree format first */
|
|
info.flags = 0;
|
|
info.cachesize = 0;
|
|
info.maxkeypage = 0;
|
|
info.minkeypage = 0;
|
|
info.psize = 0;
|
|
info.compare = NULL;
|
|
info.prefix = NULL;
|
|
info.lorder = 0;
|
|
db = (DBM *)dbopen(path, flags, mode, DB_BTREE, (void *)&info);
|
|
if (db != NULL || errno != EFTYPE)
|
|
return (db);
|
|
|
|
/* fallback to standard hash (for sendmail's aliases.db) */
|
|
db = (DBM *)dbopen(path, flags, mode, DB_HASH, NULL);
|
|
return (db);
|
|
}
|
|
|
|
/*
|
|
* ypdb_close --
|
|
* Close the db
|
|
*/
|
|
|
|
void
|
|
ypdb_close(DBM *db)
|
|
{
|
|
(void)(db->close)(db);
|
|
}
|
|
|
|
/*
|
|
* Returns:
|
|
* DATUM on success
|
|
* NULL on failure
|
|
*/
|
|
|
|
datum
|
|
ypdb_fetch(DBM *db, datum key)
|
|
{
|
|
datum retkey;
|
|
DBT nk, nd;
|
|
int status;
|
|
|
|
nk.data = key.dptr;
|
|
nk.size = key.dsize;
|
|
status = (db->get)(db, &nk, &nd, 0);
|
|
if (status) {
|
|
retkey.dptr = NULL;
|
|
retkey.dsize = 0;
|
|
} else {
|
|
retkey.dptr = nd.data;
|
|
retkey.dsize = nd.size;
|
|
}
|
|
return (retkey);
|
|
}
|
|
|
|
/*
|
|
* Returns:
|
|
* DATUM on success
|
|
* NULL on failure
|
|
*/
|
|
|
|
datum
|
|
ypdb_firstkey(DBM *db)
|
|
{
|
|
int status;
|
|
datum retkey;
|
|
DBT nk, nd;
|
|
|
|
status = (db->seq)(db, &nk, &nd, R_FIRST);
|
|
if (status) {
|
|
retkey.dptr = NULL;
|
|
retkey.dsize = 0;
|
|
} else {
|
|
retkey.dptr = nk.data;
|
|
retkey.dsize = nk.size;
|
|
}
|
|
return (retkey);
|
|
}
|
|
|
|
/*
|
|
* Returns:
|
|
* DATUM on success
|
|
* NULL on failure
|
|
*/
|
|
|
|
datum
|
|
ypdb_nextkey(DBM *db)
|
|
{
|
|
int status;
|
|
datum retkey;
|
|
DBT nk, nd;
|
|
|
|
status = (db->seq)(db, &nk, &nd, R_NEXT);
|
|
if (status) {
|
|
retkey.dptr = NULL;
|
|
retkey.dsize = 0;
|
|
} else {
|
|
retkey.dptr = nk.data;
|
|
retkey.dsize = nk.size;
|
|
}
|
|
return (retkey);
|
|
}
|
|
|
|
/*
|
|
* Returns:
|
|
* DATUM on success
|
|
* NULL on failure
|
|
*/
|
|
|
|
datum
|
|
ypdb_setkey(DBM *db, datum key)
|
|
{
|
|
int status;
|
|
DBT nk, nd;
|
|
|
|
nk.data = key.dptr;
|
|
nk.size = key.dsize;
|
|
status = (db->seq)(db, &nk, &nd, R_CURSOR);
|
|
if (status) {
|
|
key.dptr = NULL;
|
|
key.dsize = 0;
|
|
}
|
|
return (key);
|
|
}
|
|
|
|
/*
|
|
* Returns:
|
|
* 0 on success
|
|
* <0 failure
|
|
*/
|
|
|
|
int
|
|
ypdb_delete(DBM *db, datum key)
|
|
{
|
|
int status;
|
|
DBT nk;
|
|
|
|
nk.data = key.dptr;
|
|
nk.size = key.dsize;
|
|
status = (db->del)(db, &nk, 0);
|
|
if (status)
|
|
return (-1);
|
|
else
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Returns:
|
|
* 0 on success
|
|
* <0 failure
|
|
* 1 if YPDB_INSERT and entry exists
|
|
*/
|
|
|
|
int
|
|
ypdb_store(DBM *db, datum key, datum content, int flags)
|
|
{
|
|
DBT nk, nd;
|
|
|
|
if (key.dsize > YPMAXRECORD || content.dsize > YPMAXRECORD)
|
|
return -1;
|
|
nk.data = key.dptr;
|
|
nk.size = key.dsize;
|
|
nd.data = content.dptr;
|
|
nd.size = content.dsize;
|
|
return ((db->put)(db, &nk, &nd,
|
|
(flags == YPDB_INSERT) ? R_NOOVERWRITE : 0));
|
|
}
|