b9cf7d31ab
They implement a space efficent write-once database with fast access path. Switch the services(5) database to use cdb. The size of the database file decreases from 2.1MB disk space to 307KB. Access performance is about the same if setservent(0) is used and about an order of magnitude faster otherwise. services_mkdb defaults to the new format, but can optionally create the old db(3) format as well for statically linked legacy applications.
124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
/* $NetBSD: getservbyport_r.c,v 1.7 2010/04/25 00:54:46 joerg Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. 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. Neither the name of the University nor the names of its 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 THE REGENTS 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 THE REGENTS 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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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)getservbyport.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: getservbyport_r.c,v 1.7 2010/04/25 00:54:46 joerg Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <cdbr.h>
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#include <netdb.h>
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#include <string.h>
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#include <stdlib.h>
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#include "servent.h"
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#ifdef __weak_alias
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__weak_alias(getservbyport_r,_getservbyport_r)
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#endif
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static struct servent *
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_servent_getbyport(struct servent_data *sd, struct servent *sp, int port,
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const char *proto)
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{
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if ((sd->flags & (_SV_CDB | _SV_PLAINFILE)) == 0)
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return NULL;
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if (sd->flags & _SV_CDB) {
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uint8_t buf[255 + 4];
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size_t protolen;
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const uint8_t *data;
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const void *data_ptr;
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size_t datalen;
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port = be16toh(port);
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if (proto != NULL && *proto == '\0')
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return NULL;
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if (proto != NULL)
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protolen = strlen(proto);
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else
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protolen = 0;
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if (port < 0 || port > 65536)
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return NULL;
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buf[0] = 0;
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buf[1] = protolen;
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be16enc(buf + 2, port);
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memcpy(buf + 4, proto, protolen);
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if (cdbr_find(sd->cdb, buf, 4 + protolen,
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&data_ptr, &datalen))
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return NULL;
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if (datalen < protolen + 4)
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return NULL;
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data = data_ptr;
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if (be16dec(data) != port)
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return NULL;
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if (protolen) {
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if (data[2] != protolen)
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return NULL;
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if (memcmp(data + 3, proto, protolen + 1))
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return NULL;
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}
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return _servent_parsedb(sd, sp, data, datalen);
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} else {
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while (_servent_getline(sd) != -1) {
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if (_servent_parseline(sd, sp) == NULL)
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continue;
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if (sp->s_port != port)
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continue;
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if (proto == NULL || strcmp(sp->s_proto, proto) == 0)
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return sp;
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}
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return NULL;
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}
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}
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struct servent *
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getservbyport_r(int port, const char *proto, struct servent *sp,
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struct servent_data *sd)
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{
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setservent_r(sd->flags & _SV_STAYOPEN, sd);
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sp = _servent_getbyport(sd, sp, port, proto);
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if (!(sd->flags & _SV_STAYOPEN))
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_servent_close(sd);
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return sp;
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}
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