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/*
* Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 2000, 2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: lwsearch.c,v 1.13 2007/06/19 23:46:59 tbox Exp $ */
/*! \file */
#include <config.h>
#include <isc/magic.h>
#include <isc/mem.h>
#include <isc/mutex.h>
#include <isc/result.h>
#include <isc/types.h>
#include <isc/util.h>
#include <dns/name.h>
#include <dns/types.h>
#include <named/lwsearch.h>
#include <named/types.h>
#define LWSEARCHLIST_MAGIC ISC_MAGIC('L', 'W', 'S', 'L')
#define VALID_LWSEARCHLIST(l) ISC_MAGIC_VALID(l, LWSEARCHLIST_MAGIC)
isc_result_t
ns_lwsearchlist_create(isc_mem_t *mctx, ns_lwsearchlist_t **listp) {
ns_lwsearchlist_t *list;
isc_result_t result;
REQUIRE(mctx != NULL);
REQUIRE(listp != NULL && *listp == NULL);
list = isc_mem_get(mctx, sizeof(ns_lwsearchlist_t));
if (list == NULL)
return (ISC_R_NOMEMORY);
result = isc_mutex_init(&list->lock);
if (result != ISC_R_SUCCESS) {
isc_mem_put(mctx, list, sizeof(ns_lwsearchlist_t));
return (result);
}
list->mctx = NULL;
isc_mem_attach(mctx, &list->mctx);
list->refs = 1;
ISC_LIST_INIT(list->names);
list->magic = LWSEARCHLIST_MAGIC;
*listp = list;
return (ISC_R_SUCCESS);
}
void
ns_lwsearchlist_attach(ns_lwsearchlist_t *source, ns_lwsearchlist_t **target) {
REQUIRE(VALID_LWSEARCHLIST(source));
REQUIRE(target != NULL && *target == NULL);
LOCK(&source->lock);
INSIST(source->refs > 0);
source->refs++;
INSIST(source->refs != 0);
UNLOCK(&source->lock);
*target = source;
}
void
ns_lwsearchlist_detach(ns_lwsearchlist_t **listp) {
ns_lwsearchlist_t *list;
isc_mem_t *mctx;
REQUIRE(listp != NULL);
list = *listp;
REQUIRE(VALID_LWSEARCHLIST(list));
LOCK(&list->lock);
INSIST(list->refs > 0);
list->refs--;
UNLOCK(&list->lock);
*listp = NULL;
if (list->refs != 0)
return;
mctx = list->mctx;
while (!ISC_LIST_EMPTY(list->names)) {
dns_name_t *name = ISC_LIST_HEAD(list->names);
ISC_LIST_UNLINK(list->names, name, link);
dns_name_free(name, list->mctx);
isc_mem_put(list->mctx, name, sizeof(dns_name_t));
}
list->magic = 0;
isc_mem_put(mctx, list, sizeof(ns_lwsearchlist_t));
isc_mem_detach(&mctx);
}
isc_result_t
ns_lwsearchlist_append(ns_lwsearchlist_t *list, dns_name_t *name) {
dns_name_t *newname;
isc_result_t result;
REQUIRE(VALID_LWSEARCHLIST(list));
REQUIRE(name != NULL);
newname = isc_mem_get(list->mctx, sizeof(dns_name_t));
if (newname == NULL)
return (ISC_R_NOMEMORY);
dns_name_init(newname, NULL);
result = dns_name_dup(name, list->mctx, newname);
if (result != ISC_R_SUCCESS) {
isc_mem_put(list->mctx, newname, sizeof(dns_name_t));
return (result);
}
ISC_LINK_INIT(newname, link);
ISC_LIST_APPEND(list->names, newname, link);
return (ISC_R_SUCCESS);
}
void
ns_lwsearchctx_init(ns_lwsearchctx_t *sctx, ns_lwsearchlist_t *list,
dns_name_t *name, unsigned int ndots)
{
INSIST(sctx != NULL);
sctx->relname = name;
sctx->searchname = NULL;
sctx->doneexact = ISC_FALSE;
sctx->exactfirst = ISC_FALSE;
sctx->ndots = ndots;
if (dns_name_isabsolute(name) || list == NULL) {
sctx->list = NULL;
return;
}
sctx->list = list;
sctx->searchname = ISC_LIST_HEAD(sctx->list->names);
if (dns_name_countlabels(name) > ndots)
sctx->exactfirst = ISC_TRUE;
}
void
ns_lwsearchctx_first(ns_lwsearchctx_t *sctx) {
REQUIRE(sctx != NULL);
UNUSED(sctx);
}
isc_result_t
ns_lwsearchctx_next(ns_lwsearchctx_t *sctx) {
REQUIRE(sctx != NULL);
if (sctx->list == NULL)
return (ISC_R_NOMORE);
if (sctx->searchname == NULL) {
INSIST (!sctx->exactfirst || sctx->doneexact);
if (sctx->exactfirst || sctx->doneexact)
return (ISC_R_NOMORE);
sctx->doneexact = ISC_TRUE;
} else {
if (sctx->exactfirst && !sctx->doneexact)
sctx->doneexact = ISC_TRUE;
else {
sctx->searchname = ISC_LIST_NEXT(sctx->searchname,
link);
if (sctx->searchname == NULL && sctx->doneexact)
return (ISC_R_NOMORE);
}
}
return (ISC_R_SUCCESS);
}
isc_result_t
ns_lwsearchctx_current(ns_lwsearchctx_t *sctx, dns_name_t *absname) {
dns_name_t *tname;
isc_boolean_t useexact = ISC_FALSE;
REQUIRE(sctx != NULL);
if (sctx->list == NULL ||
sctx->searchname == NULL ||
(sctx->exactfirst && !sctx->doneexact))
useexact = ISC_TRUE;
if (useexact) {
if (dns_name_isabsolute(sctx->relname))
tname = NULL;
else
tname = dns_rootname;
} else
tname = sctx->searchname;
return (dns_name_concatenate(sctx->relname, tname, absname, NULL));
}
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