b2264be812
yp_dblookup.c: - Implement database handle caching. What this means is that instead of opening and closing map databases for each request, we open a database and save the handle (and, if requested, the key index) in an array. This saves a bit of overhead on things like repeated YPPROC_NEXT calls, such as you'd get from getpwent(). Normally, each YPPROC_NEXT would require open()ing the database, seeking to the location supplied by the caller (which is time consuming with hash databases as the R_CURSOR flag doesn't work), reading the data, close()ing the database and then shipping the data off to the caller. The system call overhead is prohibitive, especially with very large maps. By caching the handle to an open database, we elimitate at least the open()/close() system calls, as well as the associated DB setup and tear-down operations, for a large percentage of the time. This improves performance substantially at the cost of consuming a little more memory than before. Note that all the caching support is surrounded by #ifdef DB_CACHE so that this same source module can still be used by other programs that don't need it. - Make yp_open_db() call yp_validdomain(). Doing it here saves cycles when caching is enabled since a hit on the map cache list by definition means that the domain being referenced is valid. - Also make yp_open_db() check for exhaustion of file descriptors, just in case. yp_server.c: - Reorganize things a little to take advantage of the database handle caching. Add a call to yp_flush_all() in ypproc_clear_2_svc(). - Remove calls to yp_validdomain() from some of the service procedures. yp_validdomain() is called inside yp_open_db() now, so procedures that call into the database package don't need to use yp_validdomain() themselves. - Fix a bogosity in ypproc_maplist_2_svc(): don't summarily initiallize the result.maps pointer to NULL. This causes yp_maplist_free() to fail and leaks memory. - Make ypproc_master_2_svc() copy the string it gets from the database package into a private static buffer before trying to NUL terminate it. This is necessary with the DB handle caching: stuffing a NUL into the data returned by DB package will goof it up internally. yp_main.c: - Stuff for DB handle caching: call yp_init_dbs() to clear the handle array and add call to yp_flush_all() to the SIGHUP signal handler. Makefile.yp: - Reorganize to deal with database caching. yp_mkdb(8) can now be used to send a YPPROC_CLEAR signal to ypserv(8). Call it after each map is created to refresh ypserv's cache. - Add support for mail.alias map. Contributed by Mike Murphy (mrm@sceard.com). - Make default location for the netgroups source file be /var/yp/netgroup instead of /etc/netgroup. mkaliases: - New file: script to generate mail.alias map. Contributed by Mike Murphy (mrm@sceard.com). Makefile: - Install Makefile.yp as /var/yp/Makefile.dist and link it to /var/yp/Makefile only if /var/yp/Makefile doesn't already exist. Suggested by Peter Wemm. - Install new mkaliases script in /usr/libexec along with mknetid. - Use somewhat saner approach to generating rpcgen-dependent files as suggested by Garrett Wollman.
79 lines
3.0 KiB
C
79 lines
3.0 KiB
C
/*
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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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* $Id: yp_extern.h,v 1.2 1996/04/21 21:34:02 wpaul Exp wpaul $
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <limits.h>
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#include <db.h>
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#include <rpc/rpc.h>
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#ifndef _PATH_YP
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#define _PATH_YP "/var/yp/"
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#endif
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#ifndef _PATH_LIBEXEC
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#define _PATH_LIBEXEC "/usr/libexec/"
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#endif
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#ifndef MAX_CHILDREN
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#define MAX_CHILDREN 20
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#endif
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/*
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* External functions and variables.
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*/
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extern int debug;
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extern int ypdb_debug;
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extern int do_dns;
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extern int children;
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extern char *progname;
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extern char *yp_dir;
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extern int yp_errno;
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extern void yp_error __P((const char *, ...));
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extern int yp_get_record __P(( const char *, const char *, const DBT *, DBT *, int));
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extern int yp_first_record __P((const DB *, DBT *, DBT *, int));
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extern int yp_next_record __P((const DB *, DBT *, DBT *, int, int));
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extern char *yp_dnsname __P(( char * ));
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extern char *yp_dnsaddr __P(( const char * ));
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extern int yp_access __P((const char *, const struct svc_req * ));
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extern int yp_validdomain __P((const char * ));
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extern DB *yp_open_db __P(( const char *, const char *));
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extern DB *yp_open_db_cache __P(( const char *, const char *, const char *, int ));
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extern void yp_flush_all __P(( void ));
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extern void yp_init_dbs __P(( void ));
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extern void load_securenets __P(( void ));
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