diff options
Diffstat (limited to '')
| -rw-r--r-- | lib/dns/sdb.c | 1593 |
1 files changed, 1593 insertions, 0 deletions
diff --git a/lib/dns/sdb.c b/lib/dns/sdb.c new file mode 100644 index 0000000..cabda7f --- /dev/null +++ b/lib/dns/sdb.c @@ -0,0 +1,1593 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + +/*! \file */ + +#include <config.h> + +#include <inttypes.h> +#include <stdbool.h> +#include <string.h> + +#include <isc/buffer.h> +#include <isc/lex.h> +#include <isc/log.h> +#include <isc/magic.h> +#include <isc/mem.h> +#include <isc/once.h> +#include <isc/print.h> +#include <isc/region.h> +#include <isc/util.h> + +#include <dns/callbacks.h> +#include <dns/db.h> +#include <dns/dbiterator.h> +#include <dns/fixedname.h> +#include <dns/log.h> +#include <dns/rdata.h> +#include <dns/rdatalist.h> +#include <dns/rdataset.h> +#include <dns/rdatasetiter.h> +#include <dns/rdatatype.h> +#include <dns/result.h> +#include <dns/sdb.h> +#include <dns/types.h> + +#include "rdatalist_p.h" + +struct dns_sdbimplementation { + const dns_sdbmethods_t *methods; + void *driverdata; + unsigned int flags; + isc_mem_t *mctx; + isc_mutex_t driverlock; + dns_dbimplementation_t *dbimp; +}; + +struct dns_sdb { + /* Unlocked */ + dns_db_t common; + char *zone; + dns_sdbimplementation_t *implementation; + void *dbdata; + isc_mutex_t lock; + /* Locked */ + unsigned int references; +}; + +struct dns_sdblookup { + /* Unlocked */ + unsigned int magic; + dns_sdb_t *sdb; + ISC_LIST(dns_rdatalist_t) lists; + ISC_LIST(isc_buffer_t) buffers; + dns_name_t *name; + ISC_LINK(dns_sdblookup_t) link; + isc_mutex_t lock; + dns_rdatacallbacks_t callbacks; + /* Locked */ + unsigned int references; +}; + +typedef struct dns_sdblookup dns_sdbnode_t; + +struct dns_sdballnodes { + dns_dbiterator_t common; + ISC_LIST(dns_sdbnode_t) nodelist; + dns_sdbnode_t *current; + dns_sdbnode_t *origin; +}; + +typedef dns_sdballnodes_t sdb_dbiterator_t; + +typedef struct sdb_rdatasetiter { + dns_rdatasetiter_t common; + dns_rdatalist_t *current; +} sdb_rdatasetiter_t; + +#define SDB_MAGIC ISC_MAGIC('S', 'D', 'B', '-') + +/*% + * Note that "impmagic" is not the first four bytes of the struct, so + * ISC_MAGIC_VALID cannot be used. + */ +#define VALID_SDB(sdb) ((sdb) != NULL && \ + (sdb)->common.impmagic == SDB_MAGIC) + +#define SDBLOOKUP_MAGIC ISC_MAGIC('S','D','B','L') +#define VALID_SDBLOOKUP(sdbl) ISC_MAGIC_VALID(sdbl, SDBLOOKUP_MAGIC) +#define VALID_SDBNODE(sdbn) VALID_SDBLOOKUP(sdbn) + +/* These values are taken from RFC1537 */ +#define SDB_DEFAULT_REFRESH 28800U /* 8 hours */ +#define SDB_DEFAULT_RETRY 7200U /* 2 hours */ +#define SDB_DEFAULT_EXPIRE 604800U /* 7 days */ +#define SDB_DEFAULT_MINIMUM 86400U /* 1 day */ + +/* This is a reasonable value */ +#define SDB_DEFAULT_TTL (60 * 60 * 24) + +#ifdef __COVERITY__ +#define MAYBE_LOCK(sdb) LOCK(&sdb->implementation->driverlock) +#define MAYBE_UNLOCK(sdb) UNLOCK(&sdb->implementation->driverlock) +#else +#define MAYBE_LOCK(sdb) \ + do { \ + unsigned int flags = sdb->implementation->flags; \ + if ((flags & DNS_SDBFLAG_THREADSAFE) == 0) \ + LOCK(&sdb->implementation->driverlock); \ + } while (0) + +#define MAYBE_UNLOCK(sdb) \ + do { \ + unsigned int flags = sdb->implementation->flags; \ + if ((flags & DNS_SDBFLAG_THREADSAFE) == 0) \ + UNLOCK(&sdb->implementation->driverlock); \ + } while (0) +#endif + +static int dummy; + +static isc_result_t dns_sdb_create(isc_mem_t *mctx, dns_name_t *origin, + dns_dbtype_t type, dns_rdataclass_t rdclass, + unsigned int argc, char *argv[], + void *driverarg, dns_db_t **dbp); + +static isc_result_t findrdataset(dns_db_t *db, dns_dbnode_t *node, + dns_dbversion_t *version, + dns_rdatatype_t type, dns_rdatatype_t covers, + isc_stdtime_t now, dns_rdataset_t *rdataset, + dns_rdataset_t *sigrdataset); + +static isc_result_t createnode(dns_sdb_t *sdb, dns_sdbnode_t **nodep); + +static void destroynode(dns_sdbnode_t *node); + +static void detachnode(dns_db_t *db, dns_dbnode_t **targetp); + + +static void list_tordataset(dns_rdatalist_t *rdatalist, + dns_db_t *db, dns_dbnode_t *node, + dns_rdataset_t *rdataset); + +static void dbiterator_destroy(dns_dbiterator_t **iteratorp); +static isc_result_t dbiterator_first(dns_dbiterator_t *iterator); +static isc_result_t dbiterator_last(dns_dbiterator_t *iterator); +static isc_result_t dbiterator_seek(dns_dbiterator_t *iterator, + dns_name_t *name); +static isc_result_t dbiterator_prev(dns_dbiterator_t *iterator); +static isc_result_t dbiterator_next(dns_dbiterator_t *iterator); +static isc_result_t dbiterator_current(dns_dbiterator_t *iterator, + dns_dbnode_t **nodep, + dns_name_t *name); +static isc_result_t dbiterator_pause(dns_dbiterator_t *iterator); +static isc_result_t dbiterator_origin(dns_dbiterator_t *iterator, + dns_name_t *name); + +static dns_dbiteratormethods_t dbiterator_methods = { + dbiterator_destroy, + dbiterator_first, + dbiterator_last, + dbiterator_seek, + dbiterator_prev, + dbiterator_next, + dbiterator_current, + dbiterator_pause, + dbiterator_origin +}; + +static void rdatasetiter_destroy(dns_rdatasetiter_t **iteratorp); +static isc_result_t rdatasetiter_first(dns_rdatasetiter_t *iterator); +static isc_result_t rdatasetiter_next(dns_rdatasetiter_t *iterator); +static void rdatasetiter_current(dns_rdatasetiter_t *iterator, + dns_rdataset_t *rdataset); + +static dns_rdatasetitermethods_t rdatasetiter_methods = { + rdatasetiter_destroy, + rdatasetiter_first, + rdatasetiter_next, + rdatasetiter_current +}; + +/* + * Functions used by implementors of simple databases + */ +isc_result_t +dns_sdb_register(const char *drivername, const dns_sdbmethods_t *methods, + void *driverdata, unsigned int flags, isc_mem_t *mctx, + dns_sdbimplementation_t **sdbimp) +{ + dns_sdbimplementation_t *imp; + isc_result_t result; + + REQUIRE(drivername != NULL); + REQUIRE(methods != NULL); + REQUIRE(methods->lookup != NULL || methods->lookup2 != NULL); + REQUIRE(mctx != NULL); + REQUIRE(sdbimp != NULL && *sdbimp == NULL); + REQUIRE((flags & ~(DNS_SDBFLAG_RELATIVEOWNER | + DNS_SDBFLAG_RELATIVERDATA | + DNS_SDBFLAG_THREADSAFE| + DNS_SDBFLAG_DNS64)) == 0); + + imp = isc_mem_get(mctx, sizeof(dns_sdbimplementation_t)); + if (imp == NULL) + return (ISC_R_NOMEMORY); + imp->methods = methods; + imp->driverdata = driverdata; + imp->flags = flags; + imp->mctx = NULL; + isc_mem_attach(mctx, &imp->mctx); + result = isc_mutex_init(&imp->driverlock); + if (result != ISC_R_SUCCESS) + goto cleanup_mctx; + + imp->dbimp = NULL; + result = dns_db_register(drivername, dns_sdb_create, imp, mctx, + &imp->dbimp); + if (result != ISC_R_SUCCESS) + goto cleanup_mutex; + *sdbimp = imp; + + return (ISC_R_SUCCESS); + + cleanup_mutex: + DESTROYLOCK(&imp->driverlock); + cleanup_mctx: + isc_mem_put(mctx, imp, sizeof(dns_sdbimplementation_t)); + return (result); +} + +void +dns_sdb_unregister(dns_sdbimplementation_t **sdbimp) { + dns_sdbimplementation_t *imp; + isc_mem_t *mctx; + + REQUIRE(sdbimp != NULL && *sdbimp != NULL); + + imp = *sdbimp; + dns_db_unregister(&imp->dbimp); + DESTROYLOCK(&imp->driverlock); + + mctx = imp->mctx; + isc_mem_put(mctx, imp, sizeof(dns_sdbimplementation_t)); + isc_mem_detach(&mctx); + + *sdbimp = NULL; +} + +static inline unsigned int +initial_size(unsigned int len) { + unsigned int size; + + for (size = 1024; size < (64 * 1024); size *= 2) + if (len < size) + return (size); + return (65535); +} + +isc_result_t +dns_sdb_putrdata(dns_sdblookup_t *lookup, dns_rdatatype_t typeval, + dns_ttl_t ttl, const unsigned char *rdatap, + unsigned int rdlen) +{ + dns_rdatalist_t *rdatalist; + dns_rdata_t *rdata; + isc_buffer_t *rdatabuf = NULL; + isc_result_t result; + isc_mem_t *mctx; + isc_region_t region; + + mctx = lookup->sdb->common.mctx; + + rdatalist = ISC_LIST_HEAD(lookup->lists); + while (rdatalist != NULL) { + if (rdatalist->type == typeval) + break; + rdatalist = ISC_LIST_NEXT(rdatalist, link); + } + + if (rdatalist == NULL) { + rdatalist = isc_mem_get(mctx, sizeof(dns_rdatalist_t)); + if (rdatalist == NULL) + return (ISC_R_NOMEMORY); + dns_rdatalist_init(rdatalist); + rdatalist->rdclass = lookup->sdb->common.rdclass; + rdatalist->type = typeval; + rdatalist->ttl = ttl; + ISC_LIST_APPEND(lookup->lists, rdatalist, link); + } else + if (rdatalist->ttl != ttl) + return (DNS_R_BADTTL); + + rdata = isc_mem_get(mctx, sizeof(dns_rdata_t)); + if (rdata == NULL) + return (ISC_R_NOMEMORY); + + result = isc_buffer_allocate(mctx, &rdatabuf, rdlen); + if (result != ISC_R_SUCCESS) + goto failure; + DE_CONST(rdatap, region.base); + region.length = rdlen; + isc_buffer_copyregion(rdatabuf, ®ion); + isc_buffer_usedregion(rdatabuf, ®ion); + dns_rdata_init(rdata); + dns_rdata_fromregion(rdata, rdatalist->rdclass, rdatalist->type, + ®ion); + ISC_LIST_APPEND(rdatalist->rdata, rdata, link); + ISC_LIST_APPEND(lookup->buffers, rdatabuf, link); + rdata = NULL; + + failure: + if (rdata != NULL) + isc_mem_put(mctx, rdata, sizeof(dns_rdata_t)); + return (result); +} + +isc_result_t +dns_sdb_putrr(dns_sdblookup_t *lookup, const char *type, dns_ttl_t ttl, + const char *data) +{ + unsigned int datalen; + dns_rdatatype_t typeval; + isc_textregion_t r; + isc_lex_t *lex = NULL; + isc_result_t result; + unsigned char *p = NULL; + unsigned int size = 0; /* Init to suppress compiler warning */ + isc_mem_t *mctx; + dns_sdbimplementation_t *imp; + dns_name_t *origin; + isc_buffer_t b; + isc_buffer_t rb; + + REQUIRE(VALID_SDBLOOKUP(lookup)); + REQUIRE(type != NULL); + REQUIRE(data != NULL); + + mctx = lookup->sdb->common.mctx; + + DE_CONST(type, r.base); + r.length = strlen(type); + result = dns_rdatatype_fromtext(&typeval, &r); + if (result != ISC_R_SUCCESS) + return (result); + + imp = lookup->sdb->implementation; + if ((imp->flags & DNS_SDBFLAG_RELATIVERDATA) != 0) + origin = &lookup->sdb->common.origin; + else + origin = dns_rootname; + + result = isc_lex_create(mctx, 64, &lex); + if (result != ISC_R_SUCCESS) + goto failure; + + datalen = strlen(data); + size = initial_size(datalen); + do { + isc_buffer_constinit(&b, data, datalen); + isc_buffer_add(&b, datalen); + result = isc_lex_openbuffer(lex, &b); + if (result != ISC_R_SUCCESS) + goto failure; + + if (size >= 65535) + size = 65535; + p = isc_mem_get(mctx, size); + if (p == NULL) { + result = ISC_R_NOMEMORY; + goto failure; + } + isc_buffer_init(&rb, p, size); + result = dns_rdata_fromtext(NULL, + lookup->sdb->common.rdclass, + typeval, lex, + origin, 0, + mctx, &rb, + &lookup->callbacks); + if (result != ISC_R_NOSPACE) + break; + + /* + * Is the RR too big? + */ + if (size >= 65535) + break; + isc_mem_put(mctx, p, size); + p = NULL; + size *= 2; + } while (result == ISC_R_NOSPACE); + + if (result != ISC_R_SUCCESS) + goto failure; + + result = dns_sdb_putrdata(lookup, typeval, ttl, + isc_buffer_base(&rb), + isc_buffer_usedlength(&rb)); + failure: + if (p != NULL) + isc_mem_put(mctx, p, size); + if (lex != NULL) + isc_lex_destroy(&lex); + + return (result); +} + +static isc_result_t +getnode(dns_sdballnodes_t *allnodes, const char *name, dns_sdbnode_t **nodep) { + dns_name_t *newname, *origin; + dns_fixedname_t fnewname; + dns_sdb_t *sdb = (dns_sdb_t *)allnodes->common.db; + dns_sdbimplementation_t *imp = sdb->implementation; + dns_sdbnode_t *sdbnode; + isc_mem_t *mctx = sdb->common.mctx; + isc_buffer_t b; + isc_result_t result; + + newname = dns_fixedname_initname(&fnewname); + + if ((imp->flags & DNS_SDBFLAG_RELATIVERDATA) != 0) + origin = &sdb->common.origin; + else + origin = dns_rootname; + isc_buffer_constinit(&b, name, strlen(name)); + isc_buffer_add(&b, strlen(name)); + + result = dns_name_fromtext(newname, &b, origin, 0, NULL); + if (result != ISC_R_SUCCESS) + return (result); + + if (allnodes->common.relative_names) { + /* All names are relative to the root */ + unsigned int nlabels = dns_name_countlabels(newname); + dns_name_getlabelsequence(newname, 0, nlabels - 1, newname); + } + + sdbnode = ISC_LIST_HEAD(allnodes->nodelist); + if (sdbnode == NULL || !dns_name_equal(sdbnode->name, newname)) { + sdbnode = NULL; + result = createnode(sdb, &sdbnode); + if (result != ISC_R_SUCCESS) + return (result); + sdbnode->name = isc_mem_get(mctx, sizeof(dns_name_t)); + if (sdbnode->name == NULL) { + destroynode(sdbnode); + return (ISC_R_NOMEMORY); + } + dns_name_init(sdbnode->name, NULL); + result = dns_name_dup(newname, mctx, sdbnode->name); + if (result != ISC_R_SUCCESS) { + isc_mem_put(mctx, sdbnode->name, sizeof(dns_name_t)); + destroynode(sdbnode); + return (result); + } + ISC_LIST_PREPEND(allnodes->nodelist, sdbnode, link); + if (allnodes->origin == NULL && + dns_name_equal(newname, &sdb->common.origin)) + allnodes->origin = sdbnode; + } + *nodep = sdbnode; + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_sdb_putnamedrr(dns_sdballnodes_t *allnodes, const char *name, + const char *type, dns_ttl_t ttl, const char *data) +{ + isc_result_t result; + dns_sdbnode_t *sdbnode = NULL; + result = getnode(allnodes, name, &sdbnode); + if (result != ISC_R_SUCCESS) + return (result); + return (dns_sdb_putrr(sdbnode, type, ttl, data)); +} + +isc_result_t +dns_sdb_putnamedrdata(dns_sdballnodes_t *allnodes, const char *name, + dns_rdatatype_t type, dns_ttl_t ttl, + const void *rdata, unsigned int rdlen) +{ + isc_result_t result; + dns_sdbnode_t *sdbnode = NULL; + result = getnode(allnodes, name, &sdbnode); + if (result != ISC_R_SUCCESS) + return (result); + return (dns_sdb_putrdata(sdbnode, type, ttl, rdata, rdlen)); +} + +isc_result_t +dns_sdb_putsoa(dns_sdblookup_t *lookup, const char *mname, const char *rname, + uint32_t serial) +{ + char str[2 * DNS_NAME_MAXTEXT + 5 * (sizeof("2147483647")) + 7]; + int n; + + REQUIRE(mname != NULL); + REQUIRE(rname != NULL); + + n = snprintf(str, sizeof(str), "%s %s %u %u %u %u %u", + mname, rname, serial, + SDB_DEFAULT_REFRESH, SDB_DEFAULT_RETRY, + SDB_DEFAULT_EXPIRE, SDB_DEFAULT_MINIMUM); + if (n >= (int)sizeof(str) || n < 0) + return (ISC_R_NOSPACE); + return (dns_sdb_putrr(lookup, "SOA", SDB_DEFAULT_TTL, str)); +} + +/* + * DB routines + */ + +static void +attach(dns_db_t *source, dns_db_t **targetp) { + dns_sdb_t *sdb = (dns_sdb_t *) source; + + REQUIRE(VALID_SDB(sdb)); + + LOCK(&sdb->lock); + REQUIRE(sdb->references > 0); + sdb->references++; + UNLOCK(&sdb->lock); + + *targetp = source; +} + +static void +destroy(dns_sdb_t *sdb) { + isc_mem_t *mctx; + dns_sdbimplementation_t *imp = sdb->implementation; + + mctx = sdb->common.mctx; + + if (imp->methods->destroy != NULL) { + MAYBE_LOCK(sdb); + imp->methods->destroy(sdb->zone, imp->driverdata, + &sdb->dbdata); + MAYBE_UNLOCK(sdb); + } + + isc_mem_free(mctx, sdb->zone); + DESTROYLOCK(&sdb->lock); + + sdb->common.magic = 0; + sdb->common.impmagic = 0; + + dns_name_free(&sdb->common.origin, mctx); + + isc_mem_put(mctx, sdb, sizeof(dns_sdb_t)); + isc_mem_detach(&mctx); +} + +static void +detach(dns_db_t **dbp) { + dns_sdb_t *sdb = (dns_sdb_t *)(*dbp); + bool need_destroy = false; + + REQUIRE(VALID_SDB(sdb)); + LOCK(&sdb->lock); + REQUIRE(sdb->references > 0); + sdb->references--; + if (sdb->references == 0) + need_destroy = true; + UNLOCK(&sdb->lock); + + if (need_destroy) + destroy(sdb); + + *dbp = NULL; +} + +static isc_result_t +beginload(dns_db_t *db, dns_rdatacallbacks_t *callbacks) { + UNUSED(db); + UNUSED(callbacks); + return (ISC_R_NOTIMPLEMENTED); +} + +static isc_result_t +endload(dns_db_t *db, dns_rdatacallbacks_t *callbacks) { + UNUSED(db); + UNUSED(callbacks); + return (ISC_R_NOTIMPLEMENTED); +} + +static isc_result_t +dump(dns_db_t *db, dns_dbversion_t *version, const char *filename, + dns_masterformat_t masterformat) { + UNUSED(db); + UNUSED(version); + UNUSED(filename); + UNUSED(masterformat); + return (ISC_R_NOTIMPLEMENTED); +} + +static void +currentversion(dns_db_t *db, dns_dbversion_t **versionp) { + REQUIRE(versionp != NULL && *versionp == NULL); + + UNUSED(db); + + *versionp = (void *) &dummy; + return; +} + +static isc_result_t +newversion(dns_db_t *db, dns_dbversion_t **versionp) { + UNUSED(db); + UNUSED(versionp); + + return (ISC_R_NOTIMPLEMENTED); +} + +static void +attachversion(dns_db_t *db, dns_dbversion_t *source, + dns_dbversion_t **targetp) +{ + REQUIRE(source != NULL && source == (void *) &dummy); + REQUIRE(targetp != NULL && *targetp == NULL); + + UNUSED(db); + *targetp = source; + return; +} + +static void +closeversion(dns_db_t *db, dns_dbversion_t **versionp, bool commit) { + REQUIRE(versionp != NULL && *versionp == (void *) &dummy); + REQUIRE(commit == false); + + UNUSED(db); + UNUSED(commit); + + *versionp = NULL; +} + +static isc_result_t +createnode(dns_sdb_t *sdb, dns_sdbnode_t **nodep) { + dns_sdbnode_t *node; + isc_result_t result; + + node = isc_mem_get(sdb->common.mctx, sizeof(dns_sdbnode_t)); + if (node == NULL) + return (ISC_R_NOMEMORY); + + node->sdb = NULL; + attach((dns_db_t *)sdb, (dns_db_t **)&node->sdb); + ISC_LIST_INIT(node->lists); + ISC_LIST_INIT(node->buffers); + ISC_LINK_INIT(node, link); + node->name = NULL; + result = isc_mutex_init(&node->lock); + if (result != ISC_R_SUCCESS) { + isc_mem_put(sdb->common.mctx, node, sizeof(dns_sdbnode_t)); + return (result); + } + dns_rdatacallbacks_init(&node->callbacks); + node->references = 1; + node->magic = SDBLOOKUP_MAGIC; + + *nodep = node; + return (ISC_R_SUCCESS); +} + +static void +destroynode(dns_sdbnode_t *node) { + dns_rdatalist_t *list; + dns_rdata_t *rdata; + isc_buffer_t *b; + dns_sdb_t *sdb; + isc_mem_t *mctx; + + sdb = node->sdb; + mctx = sdb->common.mctx; + + while (!ISC_LIST_EMPTY(node->lists)) { + list = ISC_LIST_HEAD(node->lists); + while (!ISC_LIST_EMPTY(list->rdata)) { + rdata = ISC_LIST_HEAD(list->rdata); + ISC_LIST_UNLINK(list->rdata, rdata, link); + isc_mem_put(mctx, rdata, sizeof(dns_rdata_t)); + } + ISC_LIST_UNLINK(node->lists, list, link); + isc_mem_put(mctx, list, sizeof(dns_rdatalist_t)); + } + + while (!ISC_LIST_EMPTY(node->buffers)) { + b = ISC_LIST_HEAD(node->buffers); + ISC_LIST_UNLINK(node->buffers, b, link); + isc_buffer_free(&b); + } + + if (node->name != NULL) { + dns_name_free(node->name, mctx); + isc_mem_put(mctx, node->name, sizeof(dns_name_t)); + } + DESTROYLOCK(&node->lock); + node->magic = 0; + isc_mem_put(mctx, node, sizeof(dns_sdbnode_t)); + detach((dns_db_t **) (void *)&sdb); +} + +static isc_result_t +findnodeext(dns_db_t *db, dns_name_t *name, bool create, + dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo, + dns_dbnode_t **nodep) +{ + dns_sdb_t *sdb = (dns_sdb_t *)db; + dns_sdbnode_t *node = NULL; + isc_result_t result; + isc_buffer_t b; + char namestr[DNS_NAME_MAXTEXT + 1]; + bool isorigin; + dns_sdbimplementation_t *imp; + dns_name_t relname; + unsigned int labels; + + REQUIRE(VALID_SDB(sdb)); + REQUIRE(create == false); + REQUIRE(nodep != NULL && *nodep == NULL); + + UNUSED(name); + UNUSED(create); + + imp = sdb->implementation; + + isorigin = dns_name_equal(name, &sdb->common.origin); + + if (imp->methods->lookup2 != NULL) { + if ((imp->flags & DNS_SDBFLAG_RELATIVEOWNER) != 0) { + labels = dns_name_countlabels(name) - + dns_name_countlabels(&db->origin); + dns_name_init(&relname, NULL); + dns_name_getlabelsequence(name, 0, labels, &relname); + name = &relname; + } + } else { + isc_buffer_init(&b, namestr, sizeof(namestr)); + if ((imp->flags & DNS_SDBFLAG_RELATIVEOWNER) != 0) { + + labels = dns_name_countlabels(name) - + dns_name_countlabels(&db->origin); + dns_name_init(&relname, NULL); + dns_name_getlabelsequence(name, 0, labels, &relname); + result = dns_name_totext(&relname, true, &b); + if (result != ISC_R_SUCCESS) + return (result); + } else { + result = dns_name_totext(name, true, &b); + if (result != ISC_R_SUCCESS) + return (result); + } + isc_buffer_putuint8(&b, 0); + } + + result = createnode(sdb, &node); + if (result != ISC_R_SUCCESS) + return (result); + + MAYBE_LOCK(sdb); + if (imp->methods->lookup2 != NULL) + result = imp->methods->lookup2(&sdb->common.origin, name, + sdb->dbdata, node, methods, + clientinfo); + else + result = imp->methods->lookup(sdb->zone, namestr, sdb->dbdata, + node, methods, clientinfo); + MAYBE_UNLOCK(sdb); + if (result != ISC_R_SUCCESS && + !(result == ISC_R_NOTFOUND && + isorigin && imp->methods->authority != NULL)) + { + destroynode(node); + return (result); + } + + if (isorigin && imp->methods->authority != NULL) { + MAYBE_LOCK(sdb); + result = imp->methods->authority(sdb->zone, sdb->dbdata, node); + MAYBE_UNLOCK(sdb); + if (result != ISC_R_SUCCESS) { + destroynode(node); + return (result); + } + } + + *nodep = node; + return (ISC_R_SUCCESS); +} + +static isc_result_t +findext(dns_db_t *db, dns_name_t *name, dns_dbversion_t *version, + dns_rdatatype_t type, unsigned int options, isc_stdtime_t now, + dns_dbnode_t **nodep, dns_name_t *foundname, + dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo, + dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) +{ + dns_sdb_t *sdb = (dns_sdb_t *)db; + dns_dbnode_t *node = NULL; + dns_fixedname_t fname; + dns_rdataset_t xrdataset; + dns_name_t *xname; + unsigned int nlabels, olabels; + isc_result_t result; + unsigned int i; + unsigned int flags; + + REQUIRE(VALID_SDB(sdb)); + REQUIRE(nodep == NULL || *nodep == NULL); + REQUIRE(version == NULL || version == (void *) &dummy); + + UNUSED(options); + + if (!dns_name_issubdomain(name, &db->origin)) + return (DNS_R_NXDOMAIN); + + olabels = dns_name_countlabels(&db->origin); + nlabels = dns_name_countlabels(name); + + xname = dns_fixedname_initname(&fname); + + if (rdataset == NULL) { + dns_rdataset_init(&xrdataset); + rdataset = &xrdataset; + } + + result = DNS_R_NXDOMAIN; + flags = sdb->implementation->flags; + i = (flags & DNS_SDBFLAG_DNS64) != 0 ? nlabels : olabels; + for (; i <= nlabels; i++) { + /* + * Look up the next label. + */ + dns_name_getlabelsequence(name, nlabels - i, i, xname); + result = findnodeext(db, xname, false, methods, + clientinfo, &node); + if (result == ISC_R_NOTFOUND) { + /* + * No data at zone apex? + */ + if (i == olabels) + return (DNS_R_BADDB); + result = DNS_R_NXDOMAIN; + continue; + } + if (result != ISC_R_SUCCESS) + return (result); + + /* + * DNS64 zone's don't have DNAME or NS records. + */ + if ((flags & DNS_SDBFLAG_DNS64) != 0) + goto skip; + + /* + * DNS64 zone's don't have DNAME or NS records. + */ + if ((flags & DNS_SDBFLAG_DNS64) != 0) + goto skip; + + /* + * Look for a DNAME at the current label, unless this is + * the qname. + */ + if (i < nlabels) { + result = findrdataset(db, node, version, + dns_rdatatype_dname, + 0, now, rdataset, sigrdataset); + if (result == ISC_R_SUCCESS) { + result = DNS_R_DNAME; + break; + } + } + + /* + * Look for an NS at the current label, unless this is the + * origin or glue is ok. + */ + if (i != olabels && (options & DNS_DBFIND_GLUEOK) == 0) { + result = findrdataset(db, node, version, + dns_rdatatype_ns, + 0, now, rdataset, sigrdataset); + if (result == ISC_R_SUCCESS) { + if (i == nlabels && type == dns_rdatatype_any) + { + result = DNS_R_ZONECUT; + dns_rdataset_disassociate(rdataset); + if (sigrdataset != NULL && + dns_rdataset_isassociated + (sigrdataset)) { + dns_rdataset_disassociate + (sigrdataset); + } + } else + result = DNS_R_DELEGATION; + break; + } + } + + /* + * If the current name is not the qname, add another label + * and try again. + */ + if (i < nlabels) { + destroynode(node); + node = NULL; + continue; + } + + skip: + /* + * If we're looking for ANY, we're done. + */ + if (type == dns_rdatatype_any) { + result = ISC_R_SUCCESS; + break; + } + + /* + * Look for the qtype. + */ + result = findrdataset(db, node, version, type, + 0, now, rdataset, sigrdataset); + if (result == ISC_R_SUCCESS) + break; + + /* + * Look for a CNAME + */ + if (type != dns_rdatatype_cname) { + result = findrdataset(db, node, version, + dns_rdatatype_cname, + 0, now, rdataset, sigrdataset); + if (result == ISC_R_SUCCESS) { + result = DNS_R_CNAME; + break; + } + } + + result = DNS_R_NXRRSET; + break; + } + + if (rdataset == &xrdataset && dns_rdataset_isassociated(rdataset)) + dns_rdataset_disassociate(rdataset); + + if (foundname != NULL) { + isc_result_t xresult; + + xresult = dns_name_copy(xname, foundname, NULL); + if (xresult != ISC_R_SUCCESS) { + if (node != NULL) + destroynode(node); + if (dns_rdataset_isassociated(rdataset)) + dns_rdataset_disassociate(rdataset); + return (DNS_R_BADDB); + } + } + + if (nodep != NULL) + *nodep = node; + else if (node != NULL) + detachnode(db, &node); + + return (result); +} + +static isc_result_t +findzonecut(dns_db_t *db, dns_name_t *name, unsigned int options, + isc_stdtime_t now, dns_dbnode_t **nodep, dns_name_t *foundname, + dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) +{ + UNUSED(db); + UNUSED(name); + UNUSED(options); + UNUSED(now); + UNUSED(nodep); + UNUSED(foundname); + UNUSED(rdataset); + UNUSED(sigrdataset); + + return (ISC_R_NOTIMPLEMENTED); +} + +static void +attachnode(dns_db_t *db, dns_dbnode_t *source, dns_dbnode_t **targetp) { + dns_sdb_t *sdb = (dns_sdb_t *)db; + dns_sdbnode_t *node = (dns_sdbnode_t *)source; + + REQUIRE(VALID_SDB(sdb)); + + UNUSED(sdb); + + LOCK(&node->lock); + INSIST(node->references > 0); + node->references++; + INSIST(node->references != 0); /* Catch overflow. */ + UNLOCK(&node->lock); + + *targetp = source; +} + +static void +detachnode(dns_db_t *db, dns_dbnode_t **targetp) { + dns_sdb_t *sdb = (dns_sdb_t *)db; + dns_sdbnode_t *node; + bool need_destroy = false; + + REQUIRE(VALID_SDB(sdb)); + REQUIRE(targetp != NULL && *targetp != NULL); + + UNUSED(sdb); + + node = (dns_sdbnode_t *)(*targetp); + + LOCK(&node->lock); + INSIST(node->references > 0); + node->references--; + if (node->references == 0) + need_destroy = true; + UNLOCK(&node->lock); + + if (need_destroy) + destroynode(node); + + *targetp = NULL; +} + +static isc_result_t +expirenode(dns_db_t *db, dns_dbnode_t *node, isc_stdtime_t now) { + UNUSED(db); + UNUSED(node); + UNUSED(now); + INSIST(0); + return (ISC_R_UNEXPECTED); +} + +static void +printnode(dns_db_t *db, dns_dbnode_t *node, FILE *out) { + UNUSED(db); + UNUSED(node); + UNUSED(out); + return; +} + +static isc_result_t +createiterator(dns_db_t *db, unsigned int options, dns_dbiterator_t **iteratorp) +{ + dns_sdb_t *sdb = (dns_sdb_t *)db; + sdb_dbiterator_t *sdbiter; + dns_sdbimplementation_t *imp = sdb->implementation; + isc_result_t result; + + REQUIRE(VALID_SDB(sdb)); + + if (imp->methods->allnodes == NULL) + return (ISC_R_NOTIMPLEMENTED); + + if ((options & DNS_DB_NSEC3ONLY) != 0 || + (options & DNS_DB_NONSEC3) != 0) + return (ISC_R_NOTIMPLEMENTED); + + sdbiter = isc_mem_get(sdb->common.mctx, sizeof(sdb_dbiterator_t)); + if (sdbiter == NULL) + return (ISC_R_NOMEMORY); + + sdbiter->common.methods = &dbiterator_methods; + sdbiter->common.db = NULL; + dns_db_attach(db, &sdbiter->common.db); + sdbiter->common.relative_names = (options & DNS_DB_RELATIVENAMES); + sdbiter->common.magic = DNS_DBITERATOR_MAGIC; + ISC_LIST_INIT(sdbiter->nodelist); + sdbiter->current = NULL; + sdbiter->origin = NULL; + + MAYBE_LOCK(sdb); + result = imp->methods->allnodes(sdb->zone, sdb->dbdata, sdbiter); + MAYBE_UNLOCK(sdb); + if (result != ISC_R_SUCCESS) { + dbiterator_destroy((dns_dbiterator_t **) (void *)&sdbiter); + return (result); + } + + if (sdbiter->origin != NULL) { + ISC_LIST_UNLINK(sdbiter->nodelist, sdbiter->origin, link); + ISC_LIST_PREPEND(sdbiter->nodelist, sdbiter->origin, link); + } + + *iteratorp = (dns_dbiterator_t *)sdbiter; + + return (ISC_R_SUCCESS); +} + +static isc_result_t +findrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, + dns_rdatatype_t type, dns_rdatatype_t covers, + isc_stdtime_t now, dns_rdataset_t *rdataset, + dns_rdataset_t *sigrdataset) +{ + dns_rdatalist_t *list; + dns_sdbnode_t *sdbnode = (dns_sdbnode_t *)node; + + REQUIRE(VALID_SDBNODE(node)); + + UNUSED(db); + UNUSED(version); + UNUSED(covers); + UNUSED(now); + UNUSED(sigrdataset); + + if (type == dns_rdatatype_rrsig) + return (ISC_R_NOTIMPLEMENTED); + + list = ISC_LIST_HEAD(sdbnode->lists); + while (list != NULL) { + if (list->type == type) + break; + list = ISC_LIST_NEXT(list, link); + } + if (list == NULL) + return (ISC_R_NOTFOUND); + + list_tordataset(list, db, node, rdataset); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +allrdatasets(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, + isc_stdtime_t now, dns_rdatasetiter_t **iteratorp) +{ + sdb_rdatasetiter_t *iterator; + + REQUIRE(version == NULL || version == &dummy); + + UNUSED(version); + UNUSED(now); + + iterator = isc_mem_get(db->mctx, sizeof(sdb_rdatasetiter_t)); + if (iterator == NULL) + return (ISC_R_NOMEMORY); + + iterator->common.magic = DNS_RDATASETITER_MAGIC; + iterator->common.methods = &rdatasetiter_methods; + iterator->common.db = db; + iterator->common.node = NULL; + attachnode(db, node, &iterator->common.node); + iterator->common.version = version; + iterator->common.now = now; + + *iteratorp = (dns_rdatasetiter_t *)iterator; + + return (ISC_R_SUCCESS); +} + +static isc_result_t +addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, + isc_stdtime_t now, dns_rdataset_t *rdataset, unsigned int options, + dns_rdataset_t *addedrdataset) +{ + UNUSED(db); + UNUSED(node); + UNUSED(version); + UNUSED(now); + UNUSED(rdataset); + UNUSED(options); + UNUSED(addedrdataset); + + return (ISC_R_NOTIMPLEMENTED); +} + +static isc_result_t +subtractrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, + dns_rdataset_t *rdataset, unsigned int options, + dns_rdataset_t *newrdataset) +{ + UNUSED(db); + UNUSED(node); + UNUSED(version); + UNUSED(rdataset); + UNUSED(options); + UNUSED(newrdataset); + + return (ISC_R_NOTIMPLEMENTED); +} + +static isc_result_t +deleterdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, + dns_rdatatype_t type, dns_rdatatype_t covers) +{ + UNUSED(db); + UNUSED(node); + UNUSED(version); + UNUSED(type); + UNUSED(covers); + + return (ISC_R_NOTIMPLEMENTED); +} + +static bool +issecure(dns_db_t *db) { + UNUSED(db); + + return (false); +} + +static unsigned int +nodecount(dns_db_t *db) { + UNUSED(db); + + return (0); +} + +static bool +ispersistent(dns_db_t *db) { + UNUSED(db); + return (true); +} + +static void +overmem(dns_db_t *db, bool over) { + UNUSED(db); + UNUSED(over); +} + +static void +settask(dns_db_t *db, isc_task_t *task) { + UNUSED(db); + UNUSED(task); +} + + +static dns_dbmethods_t sdb_methods = { + attach, + detach, + beginload, + endload, + NULL, + dump, + currentversion, + newversion, + attachversion, + closeversion, + NULL, + NULL, + findzonecut, + attachnode, + detachnode, + expirenode, + printnode, + createiterator, + findrdataset, + allrdatasets, + addrdataset, + subtractrdataset, + deleterdataset, + issecure, + nodecount, + ispersistent, + overmem, + settask, + NULL, /* getoriginnode */ + NULL, /* transfernode */ + NULL, /* getnsec3parameters */ + NULL, /* findnsec3node */ + NULL, /* setsigningtime */ + NULL, /* getsigningtime */ + NULL, /* resigned */ + NULL, /* isdnssec */ + NULL, /* getrrsetstats */ + NULL, /* rpz_attach */ + NULL, /* rpz_ready */ + findnodeext, + findext, + NULL, /* setcachestats */ + NULL, /* hashsize */ + NULL, /* nodefullname */ + NULL /* getsize */ +}; + +static isc_result_t +dns_sdb_create(isc_mem_t *mctx, dns_name_t *origin, dns_dbtype_t type, + dns_rdataclass_t rdclass, unsigned int argc, char *argv[], + void *driverarg, dns_db_t **dbp) +{ + dns_sdb_t *sdb; + isc_result_t result; + char zonestr[DNS_NAME_MAXTEXT + 1]; + isc_buffer_t b; + dns_sdbimplementation_t *imp; + + REQUIRE(driverarg != NULL); + + imp = driverarg; + + if (type != dns_dbtype_zone) + return (ISC_R_NOTIMPLEMENTED); + + sdb = isc_mem_get(mctx, sizeof(dns_sdb_t)); + if (sdb == NULL) + return (ISC_R_NOMEMORY); + memset(sdb, 0, sizeof(dns_sdb_t)); + + dns_name_init(&sdb->common.origin, NULL); + sdb->common.attributes = 0; + sdb->common.methods = &sdb_methods; + sdb->common.rdclass = rdclass; + sdb->common.mctx = NULL; + sdb->implementation = imp; + + isc_mem_attach(mctx, &sdb->common.mctx); + + result = isc_mutex_init(&sdb->lock); + if (result != ISC_R_SUCCESS) + goto cleanup_mctx; + + result = dns_name_dupwithoffsets(origin, mctx, &sdb->common.origin); + if (result != ISC_R_SUCCESS) + goto cleanup_lock; + + isc_buffer_init(&b, zonestr, sizeof(zonestr)); + result = dns_name_totext(origin, true, &b); + if (result != ISC_R_SUCCESS) + goto cleanup_origin; + isc_buffer_putuint8(&b, 0); + + sdb->zone = isc_mem_strdup(mctx, zonestr); + if (sdb->zone == NULL) { + result = ISC_R_NOMEMORY; + goto cleanup_origin; + } + + sdb->dbdata = NULL; + if (imp->methods->create != NULL) { + MAYBE_LOCK(sdb); + result = imp->methods->create(sdb->zone, argc, argv, + imp->driverdata, &sdb->dbdata); + MAYBE_UNLOCK(sdb); + if (result != ISC_R_SUCCESS) + goto cleanup_zonestr; + } + + sdb->references = 1; + + sdb->common.magic = DNS_DB_MAGIC; + sdb->common.impmagic = SDB_MAGIC; + + *dbp = (dns_db_t *)sdb; + + return (ISC_R_SUCCESS); + + cleanup_zonestr: + isc_mem_free(mctx, sdb->zone); + cleanup_origin: + dns_name_free(&sdb->common.origin, mctx); + cleanup_lock: + (void)isc_mutex_destroy(&sdb->lock); + cleanup_mctx: + isc_mem_put(mctx, sdb, sizeof(dns_sdb_t)); + isc_mem_detach(&mctx); + + return (result); +} + + +/* + * Rdataset Methods + */ + +static void +disassociate(dns_rdataset_t *rdataset) { + dns_dbnode_t *node = rdataset->private5; + dns_sdbnode_t *sdbnode = (dns_sdbnode_t *) node; + dns_db_t *db = (dns_db_t *) sdbnode->sdb; + + detachnode(db, &node); + isc__rdatalist_disassociate(rdataset); +} + +static void +rdataset_clone(dns_rdataset_t *source, dns_rdataset_t *target) { + dns_dbnode_t *node = source->private5; + dns_sdbnode_t *sdbnode = (dns_sdbnode_t *) node; + dns_db_t *db = (dns_db_t *) sdbnode->sdb; + dns_dbnode_t *tempdb = NULL; + + isc__rdatalist_clone(source, target); + attachnode(db, node, &tempdb); + source->private5 = tempdb; +} + +static dns_rdatasetmethods_t sdb_rdataset_methods = { + disassociate, + isc__rdatalist_first, + isc__rdatalist_next, + isc__rdatalist_current, + rdataset_clone, + isc__rdatalist_count, + isc__rdatalist_addnoqname, + isc__rdatalist_getnoqname, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL +}; + +static void +list_tordataset(dns_rdatalist_t *rdatalist, + dns_db_t *db, dns_dbnode_t *node, + dns_rdataset_t *rdataset) +{ + /* + * The sdb rdataset is an rdatalist with some additions. + * - private1 & private2 are used by the rdatalist. + * - private3 & private 4 are unused. + * - private5 is the node. + */ + + /* This should never fail. */ + RUNTIME_CHECK(dns_rdatalist_tordataset(rdatalist, rdataset) == + ISC_R_SUCCESS); + + rdataset->methods = &sdb_rdataset_methods; + dns_db_attachnode(db, node, &rdataset->private5); +} + +/* + * Database Iterator Methods + */ +static void +dbiterator_destroy(dns_dbiterator_t **iteratorp) { + sdb_dbiterator_t *sdbiter = (sdb_dbiterator_t *)(*iteratorp); + dns_sdb_t *sdb = (dns_sdb_t *)sdbiter->common.db; + + while (!ISC_LIST_EMPTY(sdbiter->nodelist)) { + dns_sdbnode_t *node; + node = ISC_LIST_HEAD(sdbiter->nodelist); + ISC_LIST_UNLINK(sdbiter->nodelist, node, link); + destroynode(node); + } + + dns_db_detach(&sdbiter->common.db); + isc_mem_put(sdb->common.mctx, sdbiter, sizeof(sdb_dbiterator_t)); + + *iteratorp = NULL; +} + +static isc_result_t +dbiterator_first(dns_dbiterator_t *iterator) { + sdb_dbiterator_t *sdbiter = (sdb_dbiterator_t *)iterator; + + sdbiter->current = ISC_LIST_HEAD(sdbiter->nodelist); + if (sdbiter->current == NULL) + return (ISC_R_NOMORE); + else + return (ISC_R_SUCCESS); +} + +static isc_result_t +dbiterator_last(dns_dbiterator_t *iterator) { + sdb_dbiterator_t *sdbiter = (sdb_dbiterator_t *)iterator; + + sdbiter->current = ISC_LIST_TAIL(sdbiter->nodelist); + if (sdbiter->current == NULL) + return (ISC_R_NOMORE); + else + return (ISC_R_SUCCESS); +} + +static isc_result_t +dbiterator_seek(dns_dbiterator_t *iterator, dns_name_t *name) { + sdb_dbiterator_t *sdbiter = (sdb_dbiterator_t *)iterator; + + sdbiter->current = ISC_LIST_HEAD(sdbiter->nodelist); + while (sdbiter->current != NULL) { + if (dns_name_equal(sdbiter->current->name, name)) + return (ISC_R_SUCCESS); + sdbiter->current = ISC_LIST_NEXT(sdbiter->current, link); + } + return (ISC_R_NOTFOUND); +} + +static isc_result_t +dbiterator_prev(dns_dbiterator_t *iterator) { + sdb_dbiterator_t *sdbiter = (sdb_dbiterator_t *)iterator; + + sdbiter->current = ISC_LIST_PREV(sdbiter->current, link); + if (sdbiter->current == NULL) + return (ISC_R_NOMORE); + else + return (ISC_R_SUCCESS); +} + +static isc_result_t +dbiterator_next(dns_dbiterator_t *iterator) { + sdb_dbiterator_t *sdbiter = (sdb_dbiterator_t *)iterator; + + sdbiter->current = ISC_LIST_NEXT(sdbiter->current, link); + if (sdbiter->current == NULL) + return (ISC_R_NOMORE); + else + return (ISC_R_SUCCESS); +} + +static isc_result_t +dbiterator_current(dns_dbiterator_t *iterator, dns_dbnode_t **nodep, + dns_name_t *name) +{ + sdb_dbiterator_t *sdbiter = (sdb_dbiterator_t *)iterator; + + attachnode(iterator->db, sdbiter->current, nodep); + if (name != NULL) + return (dns_name_copy(sdbiter->current->name, name, NULL)); + return (ISC_R_SUCCESS); +} + +static isc_result_t +dbiterator_pause(dns_dbiterator_t *iterator) { + UNUSED(iterator); + return (ISC_R_SUCCESS); +} + +static isc_result_t +dbiterator_origin(dns_dbiterator_t *iterator, dns_name_t *name) { + UNUSED(iterator); + return (dns_name_copy(dns_rootname, name, NULL)); +} + +/* + * Rdataset Iterator Methods + */ + +static void +rdatasetiter_destroy(dns_rdatasetiter_t **iteratorp) { + sdb_rdatasetiter_t *sdbiterator = (sdb_rdatasetiter_t *)(*iteratorp); + detachnode(sdbiterator->common.db, &sdbiterator->common.node); + isc_mem_put(sdbiterator->common.db->mctx, sdbiterator, + sizeof(sdb_rdatasetiter_t)); + *iteratorp = NULL; +} + +static isc_result_t +rdatasetiter_first(dns_rdatasetiter_t *iterator) { + sdb_rdatasetiter_t *sdbiterator = (sdb_rdatasetiter_t *)iterator; + dns_sdbnode_t *sdbnode = (dns_sdbnode_t *)iterator->node; + + if (ISC_LIST_EMPTY(sdbnode->lists)) + return (ISC_R_NOMORE); + sdbiterator->current = ISC_LIST_HEAD(sdbnode->lists); + return (ISC_R_SUCCESS); +} + +static isc_result_t +rdatasetiter_next(dns_rdatasetiter_t *iterator) { + sdb_rdatasetiter_t *sdbiterator = (sdb_rdatasetiter_t *)iterator; + + sdbiterator->current = ISC_LIST_NEXT(sdbiterator->current, link); + if (sdbiterator->current == NULL) + return (ISC_R_NOMORE); + else + return (ISC_R_SUCCESS); +} + +static void +rdatasetiter_current(dns_rdatasetiter_t *iterator, dns_rdataset_t *rdataset) { + sdb_rdatasetiter_t *sdbiterator = (sdb_rdatasetiter_t *)iterator; + + list_tordataset(sdbiterator->current, iterator->db, iterator->node, + rdataset); +} |