minix/lib/libc/yp/yp_match.c

252 lines
6 KiB
C
Raw Normal View History

/* $NetBSD: yp_match.c,v 1.19 2012/03/20 16:30:26 matt Exp $ */
/*
* Copyright (c) 1992, 1993 Theo de Raadt <deraadt@fsa.ca>
* All rights reserved.
*
* 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.
*
* 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>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: yp_match.c,v 1.19 2012/03/20 16:30:26 matt Exp $");
#endif
#include "namespace.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <rpc/rpc.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#include "local.h"
#define YPMATCHCACHE
extern struct timeval _yplib_timeout;
extern int _yplib_nerrs;
extern int _yplib_bindtries;
extern char _yp_domain[];
#ifdef __weak_alias
__weak_alias(yp_match,_yp_match)
#endif
#ifdef YPMATCHCACHE
int _yplib_cache = 5;
static struct ypmatch_ent {
struct ypmatch_ent *next;
char *map, *key;
char *val;
int keylen, vallen;
time_t expire_t;
} *ypmc;
static bool_t ypmatch_add(const char *, const char *, int, char *, int);
static bool_t ypmatch_find(const char *, const char *, int, const char **,
int *);
static bool_t
ypmatch_add(const char *map, const char *key, int keylen, char *val, int vallen)
{
struct ypmatch_ent *ep;
time_t t;
_DIAGASSERT(map != NULL);
_DIAGASSERT(key != NULL);
_DIAGASSERT(val != NULL);
(void)time(&t);
for (ep = ypmc; ep; ep = ep->next)
if (ep->expire_t < t)
break;
if (ep == NULL) {
if ((ep = malloc(sizeof *ep)) == NULL)
return 0;
(void)memset(ep, 0, sizeof *ep);
if (ypmc)
ep->next = ypmc;
ypmc = ep;
}
if (ep->key) {
free(ep->key);
ep->key = NULL;
}
if (ep->val) {
free(ep->val);
ep->val = NULL;
}
if ((ep->key = malloc((size_t)keylen)) == NULL)
return 0;
if ((ep->val = malloc((size_t)vallen)) == NULL) {
free(ep->key);
ep->key = NULL;
return 0;
}
ep->keylen = keylen;
ep->vallen = vallen;
(void)memcpy(ep->key, key, (size_t)ep->keylen);
(void)memcpy(ep->val, val, (size_t)ep->vallen);
if (ep->map) {
if (strcmp(ep->map, map)) {
free(ep->map);
if ((ep->map = strdup(map)) == NULL)
return 0;
}
} else {
if ((ep->map = strdup(map)) == NULL)
return 0;
}
ep->expire_t = t + _yplib_cache;
return 1;
}
static bool_t
ypmatch_find(const char *map, const char *key, int keylen, const char **val,
int *vallen)
{
struct ypmatch_ent *ep;
time_t t;
_DIAGASSERT(map != NULL);
_DIAGASSERT(key != NULL);
_DIAGASSERT(val != NULL);
if (ypmc == NULL)
return 0;
(void) time(&t);
for (ep = ypmc; ep; ep = ep->next) {
if (ep->keylen != keylen)
continue;
if (strcmp(ep->map, map))
continue;
if (memcmp(ep->key, key, (size_t)keylen))
continue;
if (t > ep->expire_t)
continue;
*val = ep->val;
*vallen = ep->vallen;
return 1;
}
return 0;
}
#endif
int
yp_match(const char *indomain, const char *inmap, const char *inkey,
int inkeylen, char **outval, int *outvallen)
{
struct dom_binding *ysd;
struct ypresp_val yprv;
struct ypreq_key yprk;
int r, nerrs = 0;
if (outval == NULL || outvallen == NULL)
return YPERR_BADARGS;
*outval = NULL;
*outvallen = 0;
if (_yp_invalid_domain(indomain))
return YPERR_BADARGS;
if (inmap == NULL || *inmap == '\0'
|| strlen(inmap) > YPMAXMAP)
return YPERR_BADARGS;
if (inkey == NULL || inkeylen == 0)
return YPERR_BADARGS;
again:
if (_yp_dobind(indomain, &ysd) != 0)
return YPERR_DOMAIN;
#ifdef YPMATCHCACHE
if (!strcmp(_yp_domain, indomain) && ypmatch_find(inmap, inkey,
inkeylen, &yprv.valdat.dptr, &yprv.valdat.dsize)) {
*outvallen = yprv.valdat.dsize;
if ((*outval = malloc((size_t)(*outvallen + 1))) == NULL)
return YPERR_YPERR;
(void)memcpy(*outval, yprv.valdat.dptr, (size_t)*outvallen);
(*outval)[*outvallen] = '\0';
return 0;
}
#endif
yprk.domain = indomain;
yprk.map = inmap;
yprk.keydat.dptr = __UNCONST(inkey);
yprk.keydat.dsize = inkeylen;
memset(&yprv, 0, sizeof yprv);
r = clnt_call(ysd->dom_client, (rpcproc_t)YPPROC_MATCH,
(xdrproc_t)xdr_ypreq_key, &yprk,
(xdrproc_t)xdr_ypresp_val, &yprv,
_yplib_timeout);
if (r != RPC_SUCCESS) {
if (_yplib_bindtries <= 0 && ++nerrs == _yplib_nerrs) {
clnt_perror(ysd->dom_client, "yp_match: clnt_call");
nerrs = 0;
}
else if (_yplib_bindtries > 0 && ++nerrs == _yplib_bindtries) {
return YPERR_YPSERV;
}
ysd->dom_vers = -1;
goto again;
}
if (!(r = ypprot_err(yprv.status))) {
*outvallen = yprv.valdat.dsize;
if ((*outval = malloc((size_t)(*outvallen + 1))) == NULL)
return YPERR_YPERR;
(void)memcpy(*outval, yprv.valdat.dptr, (size_t)*outvallen);
(*outval)[*outvallen] = '\0';
#ifdef YPMATCHCACHE
if (strcmp(_yp_domain, indomain) == 0)
if (!ypmatch_add(inmap, inkey, inkeylen,
*outval, *outvallen))
r = YPERR_RESRC;
#endif
}
xdr_free((xdrproc_t)xdr_ypresp_val, (char *)(void *)&yprv);
__yp_unbind(ysd);
if (r != 0) {
if (*outval) {
free(*outval);
*outval = NULL;
}
}
return r;
}