diff options
Diffstat (limited to 'contrib/bind9/lib/dns/cache.c')
| -rw-r--r-- | contrib/bind9/lib/dns/cache.c | 143 |
1 files changed, 108 insertions, 35 deletions
diff --git a/contrib/bind9/lib/dns/cache.c b/contrib/bind9/lib/dns/cache.c index 56bff8d9d8d7..d0f05b9a09ab 100644 --- a/contrib/bind9/lib/dns/cache.c +++ b/contrib/bind9/lib/dns/cache.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2004-2009, 2011, 2012 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 2004-2009, 2011, 2013 Internet Systems Consortium, Inc. ("ISC") * Copyright (C) 1999-2003 Internet Software Consortium. * * Permission to use, copy, modify, and/or distribute this software for any @@ -15,7 +15,7 @@ * PERFORMANCE OF THIS SOFTWARE. */ -/* $Id$ */ +/* $Id: cache.c,v 1.91 2011/08/26 05:12:56 marka Exp $ */ /*! \file */ @@ -50,7 +50,7 @@ * DNS_CACHE_MINSIZE is how many bytes is the floor for dns_cache_setcachesize(). * See also DNS_CACHE_CLEANERINCREMENT */ -#define DNS_CACHE_MINSIZE 2097152 /*%< Bytes. 2097152 = 2 MB */ +#define DNS_CACHE_MINSIZE 2097152U /*%< Bytes. 2097152 = 2 MB */ /*! * Control incremental cleaning. * CLEANERINCREMENT is how many nodes are examined in one pass. @@ -136,7 +136,7 @@ struct dns_cache { char *db_type; int db_argc; char **db_argv; - isc_uint32_t size; + size_t size; /* Locked by 'filelock'. */ char *filename; @@ -1028,9 +1028,8 @@ water(void *arg, int mark) { } void -dns_cache_setcachesize(dns_cache_t *cache, isc_uint32_t size) { - isc_uint32_t lowater; - isc_uint32_t hiwater; +dns_cache_setcachesize(dns_cache_t *cache, size_t size) { + size_t hiwater, lowater; REQUIRE(VALID_CACHE(cache)); @@ -1038,7 +1037,7 @@ dns_cache_setcachesize(dns_cache_t *cache, isc_uint32_t size) { * Impose a minimum cache size; pathological things happen if there * is too little room. */ - if (size != 0 && size < DNS_CACHE_MINSIZE) + if (size != 0U && size < DNS_CACHE_MINSIZE) size = DNS_CACHE_MINSIZE; LOCK(&cache->lock); @@ -1055,7 +1054,7 @@ dns_cache_setcachesize(dns_cache_t *cache, isc_uint32_t size) { * water(). */ - if (size == 0 || hiwater == 0 || lowater == 0) + if (size == 0U || hiwater == 0U || lowater == 0U) /* * Disable cache memory limiting. */ @@ -1068,9 +1067,9 @@ dns_cache_setcachesize(dns_cache_t *cache, isc_uint32_t size) { isc_mem_setwater(cache->mctx, water, cache, hiwater, lowater); } -isc_uint32_t +size_t dns_cache_getcachesize(dns_cache_t *cache) { - isc_uint32_t size; + size_t size; REQUIRE(VALID_CACHE(cache)); @@ -1153,31 +1152,14 @@ dns_cache_flush(dns_cache_t *cache) { return (ISC_R_SUCCESS); } -isc_result_t -dns_cache_flushname(dns_cache_t *cache, dns_name_t *name) { +static isc_result_t +clearnode(dns_db_t *db, dns_dbnode_t *node) { isc_result_t result; dns_rdatasetiter_t *iter = NULL; - dns_dbnode_t *node = NULL; - dns_db_t *db = NULL; - - LOCK(&cache->lock); - if (cache->db != NULL) - dns_db_attach(cache->db, &db); - UNLOCK(&cache->lock); - if (db == NULL) - return (ISC_R_SUCCESS); - result = dns_db_findnode(cache->db, name, ISC_FALSE, &node); - if (result == ISC_R_NOTFOUND) { - result = ISC_R_SUCCESS; - goto cleanup_db; - } - if (result != ISC_R_SUCCESS) - goto cleanup_db; - result = dns_db_allrdatasets(cache->db, node, NULL, - (isc_stdtime_t)0, &iter); + result = dns_db_allrdatasets(db, node, NULL, (isc_stdtime_t)0, &iter); if (result != ISC_R_SUCCESS) - goto cleanup_node; + return (result); for (result = dns_rdatasetiter_first(iter); result == ISC_R_SUCCESS; @@ -1187,19 +1169,110 @@ dns_cache_flushname(dns_cache_t *cache, dns_name_t *name) { dns_rdataset_init(&rdataset); dns_rdatasetiter_current(iter, &rdataset); - result = dns_db_deleterdataset(cache->db, node, NULL, + result = dns_db_deleterdataset(db, node, NULL, rdataset.type, rdataset.covers); dns_rdataset_disassociate(&rdataset); if (result != ISC_R_SUCCESS && result != DNS_R_UNCHANGED) break; } + if (result == ISC_R_NOMORE) result = ISC_R_SUCCESS; dns_rdatasetiter_destroy(&iter); + return (result); +} + +static isc_result_t +cleartree(dns_db_t *db, dns_name_t *name) { + isc_result_t result, answer = ISC_R_SUCCESS; + dns_dbiterator_t *iter = NULL; + dns_dbnode_t *node = NULL; + dns_fixedname_t fnodename; + dns_name_t *nodename; + + dns_fixedname_init(&fnodename); + nodename = dns_fixedname_name(&fnodename); + + result = dns_db_createiterator(db, 0, &iter); + if (result != ISC_R_SUCCESS) + goto cleanup; - cleanup_node: - dns_db_detachnode(cache->db, &node); + result = dns_dbiterator_seek(iter, name); + if (result != ISC_R_SUCCESS) + goto cleanup; + + while (result == ISC_R_SUCCESS) { + result = dns_dbiterator_current(iter, &node, nodename); + if (result == DNS_R_NEWORIGIN) + result = ISC_R_SUCCESS; + if (result != ISC_R_SUCCESS) + goto cleanup; + /* + * Are we done? + */ + if (! dns_name_issubdomain(nodename, name)) + goto cleanup; + + /* + * If clearnode fails record and move onto the next node. + */ + result = clearnode(db, node); + if (result != ISC_R_SUCCESS && answer == ISC_R_SUCCESS) + answer = result; + dns_db_detachnode(db, &node); + result = dns_dbiterator_next(iter); + } + + cleanup: + if (result == ISC_R_NOMORE || result == ISC_R_NOTFOUND) + result = ISC_R_SUCCESS; + if (result != ISC_R_SUCCESS && answer == ISC_R_SUCCESS) + answer = result; + if (node != NULL) + dns_db_detachnode(db, &node); + if (iter != NULL) + dns_dbiterator_destroy(&iter); + + return (answer); +} + +isc_result_t +dns_cache_flushname(dns_cache_t *cache, dns_name_t *name) { + return (dns_cache_flushnode(cache, name, ISC_FALSE)); +} + +isc_result_t +dns_cache_flushnode(dns_cache_t *cache, dns_name_t *name, + isc_boolean_t tree) +{ + isc_result_t result; + dns_dbnode_t *node = NULL; + dns_db_t *db = NULL; + + if (dns_name_equal(name, dns_rootname)) + return (dns_cache_flush(cache)); + + LOCK(&cache->lock); + if (cache->db != NULL) + dns_db_attach(cache->db, &db); + UNLOCK(&cache->lock); + if (db == NULL) + return (ISC_R_SUCCESS); + + if (tree) { + result = cleartree(cache->db, name); + } else { + result = dns_db_findnode(cache->db, name, ISC_FALSE, &node); + if (result == ISC_R_NOTFOUND) { + result = ISC_R_SUCCESS; + goto cleanup_db; + } + if (result != ISC_R_SUCCESS) + goto cleanup_db; + result = clearnode(cache->db, node); + dns_db_detachnode(cache->db, &node); + } cleanup_db: dns_db_detach(&db); |