1995-12-16 20:54:17 +00:00
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/*
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* Copyright (c) 1995
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* Bill Paul <wpaul@ctr.columbia.edu>. 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 by Bill Paul.
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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 Bill Paul 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 Bill Paul 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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1995-12-23 21:35:35 +00:00
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* $Id: yp_dblookup.c,v 1.1.1.1 1995/12/16 20:54:17 wpaul Exp $
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1995-12-16 20:54:17 +00:00
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <string.h>
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#include <limits.h>
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#include <unistd.h>
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#include <db.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <paths.h>
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#include "yp.h"
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#include "yp_extern.h"
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1995-12-23 21:35:35 +00:00
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int ypdb_debug = 0;
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1995-12-16 20:54:17 +00:00
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int yp_errno = YP_TRUE;
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#define PERM_SECURE (S_IRUSR|S_IWUSR)
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HASHINFO openinfo = {
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4096, /* bsize */
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32, /* ffactor */
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256, /* nelem */
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2048 * 1024, /* cachesize */
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NULL, /* hash */
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0, /* lorder */
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};
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/*
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* Open a DB database
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*/
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DB *yp_open_db(domain, map)
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const char *domain;
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const char *map;
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{
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DB *dbp;
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char buf[1025];
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yp_errno = YP_TRUE;
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if (map[0] == '.' || strchr(map, '/')) {
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yp_errno = YP_BADARGS;
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return (NULL);
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}
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snprintf(buf, sizeof(buf), "%s/%s/%s", yp_dir, domain, map);
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dbp = dbopen(buf,O_RDONLY|O_EXCL, PERM_SECURE, DB_HASH, &openinfo);
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if (dbp == NULL) {
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switch(errno) {
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case ENOENT:
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yp_errno = YP_NOMAP;
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break;
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case EFTYPE:
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yp_errno = YP_BADDB;
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break;
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default:
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yp_errno = YP_YPERR;
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break;
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}
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}
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return (dbp);
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}
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/*
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* Database access routines.
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*
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* - yp_get_record(): retrieve an arbitrary key/data pair given one key
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* to match against.
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*
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* - yp_first_record(): retrieve first key/data base in a database.
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*
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* - yp_next_record(): retrieve key/data pair that sequentially follows
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* the supplied key value in the database.
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*/
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int yp_get_record(domain,map,key,data,allow)
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const char *domain;
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const char *map;
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const DBT *key;
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DBT *data;
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int allow;
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{
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DB *dbp;
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1995-12-23 21:35:35 +00:00
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if (ypdb_debug)
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1995-12-16 20:54:17 +00:00
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yp_error("Looking up key [%.*s] in map [%s]",
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key->size, key->data, map);
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/*
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* Avoid passing back magic "YP_*" entries unless
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* the caller specifically requested them by setting
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* the 'allow' flag.
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*/
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if (!allow && !strncmp(key->data, "YP_", 3))
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return(YP_NOKEY);
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if ((dbp = yp_open_db(domain, map)) == NULL) {
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return(yp_errno);
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}
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if ((dbp->get)(dbp,key,data,0)) {
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(void)(dbp->close)(dbp);
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return(YP_NOKEY);
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}
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(void)(dbp->close)(dbp);
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1995-12-23 21:35:35 +00:00
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if (ypdb_debug)
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1995-12-16 20:54:17 +00:00
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yp_error("Result of lookup: key: [%.*s] data: [%.*s]",
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key->size, key->data, data->size, data->data);
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return(YP_TRUE);
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}
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int yp_first_record(dbp,key,data)
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const DB *dbp;
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DBT *key;
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DBT *data;
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{
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1995-12-23 21:35:35 +00:00
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if (ypdb_debug)
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1995-12-16 20:54:17 +00:00
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yp_error("Retrieving first key in map.");
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if ((dbp->seq)(dbp,key,data,R_FIRST))
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return(YP_BADDB);
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/* Avoid passing back magic "YP_*" records. */
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while (!strncmp(key->data, "YP_", 3)) {
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if ((dbp->seq)(dbp,key,data,R_NEXT))
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return(YP_BADDB);
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}
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1995-12-23 21:35:35 +00:00
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if (ypdb_debug)
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1995-12-16 20:54:17 +00:00
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yp_error("Result of lookup: key: [%.*s] data: [%.*s]",
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key->size, key->data, data->size, data->data);
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return(YP_TRUE);
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}
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int yp_next_record(dbp,key,data,all)
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const DB *dbp;
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DBT *key;
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DBT *data;
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int all;
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{
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DBT lkey, ldata;
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if (key == NULL || key->data == NULL)
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return(yp_first_record(dbp,key,data));
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1995-12-23 21:35:35 +00:00
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if (ypdb_debug)
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1995-12-16 20:54:17 +00:00
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yp_error("Retreiving next key, previous was: [%.*s]",
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key->size, key->data);
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if (!all) {
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(dbp->seq)(dbp,&lkey,&ldata,R_FIRST);
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while(strncmp((char *)key->data,lkey.data,(int)key->size) ||
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key->size != lkey.size)
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(dbp->seq)(dbp,&lkey,&ldata,R_NEXT);
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}
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if ((dbp->seq)(dbp,&lkey,&ldata,R_NEXT))
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return(YP_NOMORE);
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/* Avoid passing back magic "YP_*" records. */
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while (!strncmp(lkey.data, "YP_", 3))
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if ((dbp->seq)(dbp,&lkey,&ldata,R_NEXT))
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return(YP_NOMORE);
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if ((dbp->get)(dbp,&lkey,&ldata,0))
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return(YP_FALSE);
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*key = lkey;
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*data = ldata;
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1995-12-23 21:35:35 +00:00
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if (ypdb_debug)
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1995-12-16 20:54:17 +00:00
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yp_error("Result of lookup: key: [%.*s] data: [%.*s]",
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key->size, key->data, data->size, data->data);
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return(YP_TRUE);
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}
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