/* * Copyright (C) 2000, 2001, 2003 Internet Software Consortium. * * Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL * INTERNET SOFTWARE CONSORTIUM 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. */ /* $ISC: sdb.c,v 1.35.2.2 2003/10/09 07:32:38 marka Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 RFC 1537 */ #define SDB_DEFAULT_REFRESH (60 * 60 * 8) #define SDB_DEFAULT_RETRY (60 * 60 * 2) #define SDB_DEFAULT_EXPIRE (60 * 60 * 24 * 7) #define SDB_DEFAULT_MINIMUM (60 * 60 * 24) /* This is a reasonable value */ #define SDB_DEFAULT_TTL (60 * 60 * 24) #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) 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); REQUIRE(mctx != NULL); REQUIRE(sdbimp != NULL && *sdbimp == NULL); REQUIRE((flags & ~(DNS_SDBFLAG_RELATIVEOWNER | DNS_SDBFLAG_RELATIVERDATA | DNS_SDBFLAG_THREADSAFE)) == 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) { UNEXPECTED_ERROR(__FILE__, __LINE__, "isc_mutex_init() failed: %s", isc_result_totext(result)); 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(const char *data) { unsigned int len = strlen(data); unsigned int size; for (size = 64; size < (64 * 1024); size *= 2) if (len < size) return (size); return (64 * 1024); } isc_result_t dns_sdb_putrr(dns_sdblookup_t *lookup, const char *type, dns_ttl_t ttl, const char *data) { dns_rdatalist_t *rdatalist; dns_rdata_t *rdata; dns_rdatatype_t typeval; isc_consttextregion_t r; isc_buffer_t b; isc_buffer_t *rdatabuf; isc_lex_t *lex; isc_result_t result; unsigned int size; isc_mem_t *mctx; dns_sdbimplementation_t *imp; dns_name_t *origin; REQUIRE(VALID_SDBLOOKUP(lookup)); REQUIRE(type != NULL); REQUIRE(data != NULL); mctx = lookup->sdb->common.mctx; r.base = type; r.length = strlen(type); result = dns_rdatatype_fromtext(&typeval, (isc_textregion_t *)&r); if (result != ISC_R_SUCCESS) return (result); 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); rdatalist->rdclass = lookup->sdb->common.rdclass; rdatalist->type = typeval; rdatalist->covers = 0; rdatalist->ttl = ttl; ISC_LIST_INIT(rdatalist->rdata); ISC_LINK_INIT(rdatalist, link); 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); dns_rdata_init(rdata); imp = lookup->sdb->implementation; if ((imp->flags & DNS_SDBFLAG_RELATIVERDATA) != 0) origin = &lookup->sdb->common.origin; else origin = dns_rootname; lex = NULL; result = isc_lex_create(mctx, 64, &lex); if (result != ISC_R_SUCCESS) goto failure; size = initial_size(data); do { isc_buffer_init(&b, data, strlen(data)); isc_buffer_add(&b, strlen(data)); result = isc_lex_openbuffer(lex, &b); if (result != ISC_R_SUCCESS) goto failure; rdatabuf = NULL; result = isc_buffer_allocate(mctx, &rdatabuf, size); if (result != ISC_R_SUCCESS) goto failure; result = dns_rdata_fromtext(rdata, rdatalist->rdclass, rdatalist->type, lex, origin, ISC_FALSE, mctx, rdatabuf, &lookup->callbacks); if (result != ISC_R_SUCCESS) isc_buffer_free(&rdatabuf); size *= 2; } while (result == ISC_R_NOSPACE); if (result != ISC_R_SUCCESS) goto failure; ISC_LIST_APPEND(rdatalist->rdata, rdata, link); ISC_LIST_APPEND(lookup->buffers, rdatabuf, link); if (lex != NULL) isc_lex_destroy(&lex); return (ISC_R_SUCCESS); failure: if (rdatabuf != NULL) isc_buffer_free(&rdatabuf); if (lex != NULL) isc_lex_destroy(&lex); isc_mem_put(mctx, rdata, sizeof(dns_rdata_t)); return (result); } isc_result_t dns_sdb_putnamedrr(dns_sdballnodes_t *allnodes, const char *name, const char *type, dns_ttl_t ttl, const char *data) { 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; dns_fixedname_init(&fnewname); newname = dns_fixedname_name(&fnewname); if ((imp->flags & DNS_SDBFLAG_RELATIVERDATA) != 0) origin = &sdb->common.origin; else origin = dns_rootname; isc_buffer_init(&b, name, strlen(name)); isc_buffer_add(&b, strlen(name)); result = dns_name_fromtext(newname, &b, origin, ISC_FALSE, 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; } return (dns_sdb_putrr(sdbnode, type, ttl, data)); } isc_result_t dns_sdb_putsoa(dns_sdblookup_t *lookup, const char *mname, const char *rname, isc_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); isc_boolean_t need_destroy = ISC_FALSE; REQUIRE(VALID_SDB(sdb)); LOCK(&sdb->lock); REQUIRE(sdb->references > 0); sdb->references--; if (sdb->references == 0) need_destroy = ISC_TRUE; UNLOCK(&sdb->lock); if (need_destroy) destroy(sdb); *dbp = NULL; } static isc_result_t beginload(dns_db_t *db, dns_addrdatasetfunc_t *addp, dns_dbload_t **dbloadp) { UNUSED(db); UNUSED(addp); UNUSED(dbloadp); return (ISC_R_NOTIMPLEMENTED); } static isc_result_t endload(dns_db_t *db, dns_dbload_t **dbloadp) { UNUSED(db); UNUSED(dbloadp); return (ISC_R_NOTIMPLEMENTED); } static isc_result_t dump(dns_db_t *db, dns_dbversion_t *version, const char *filename) { UNUSED(db); UNUSED(version); UNUSED(filename); 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); UNUSED(db); UNUSED(source); UNUSED(targetp); return; } static void closeversion(dns_db_t *db, dns_dbversion_t **versionp, isc_boolean_t commit) { REQUIRE(versionp != NULL && *versionp == (void *) &dummy); REQUIRE(commit == ISC_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) { UNEXPECTED_ERROR(__FILE__, __LINE__, "isc_mutex_init() failed: %s", isc_result_totext(result)); isc_mem_put(sdb->common.mctx, node, sizeof(dns_sdbnode_t)); return (ISC_R_UNEXPECTED); } 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 **)&sdb); } static isc_result_t findnode(dns_db_t *db, dns_name_t *name, isc_boolean_t create, 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]; isc_boolean_t isorigin; dns_sdbimplementation_t *imp; REQUIRE(VALID_SDB(sdb)); REQUIRE(create == ISC_FALSE); REQUIRE(nodep != NULL && *nodep == NULL); UNUSED(name); UNUSED(create); imp = sdb->implementation; isc_buffer_init(&b, namestr, sizeof(namestr)); if ((imp->flags & DNS_SDBFLAG_RELATIVEOWNER) != 0) { dns_name_t relname; unsigned int labels; 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, ISC_TRUE, &b); if (result != ISC_R_SUCCESS) return (result); } else { result = dns_name_totext(name, ISC_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); isorigin = dns_name_equal(name, &sdb->common.origin); MAYBE_LOCK(sdb); result = imp->methods->lookup(sdb->zone, namestr, sdb->dbdata, node); MAYBE_UNLOCK(sdb); if (result != ISC_R_SUCCESS && !isorigin) { 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 find(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_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; REQUIRE(VALID_SDB(sdb)); REQUIRE(nodep == NULL || *nodep == NULL); REQUIRE(version == NULL || version == (void *) &dummy); UNUSED(options); UNUSED(sdb); if (!dns_name_issubdomain(name, &db->origin)) return (DNS_R_NXDOMAIN); olabels = dns_name_countlabels(&db->origin); nlabels = dns_name_countlabels(name); dns_fixedname_init(&fname); xname = dns_fixedname_name(&fname); if (rdataset == NULL) { dns_rdataset_init(&xrdataset); rdataset = &xrdataset; } result = DNS_R_NXDOMAIN; for (i = olabels; i <= nlabels; i++) { /* * Unless this is an explicit lookup at the origin, don't * look at the origin. */ if (i == olabels && i != nlabels) continue; /* * Look up the next label. */ dns_name_getlabelsequence(name, nlabels - i, i, xname); result = findnode(db, xname, ISC_FALSE, &node); if (result != ISC_R_SUCCESS) { result = DNS_R_NXDOMAIN; continue; } /* * 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_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; } /* * 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) { 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; isc_boolean_t need_destroy = ISC_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 = ISC_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, isc_boolean_t relative_names, 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); 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 = relative_names; 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 **)&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_sig) 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 isc_boolean_t issecure(dns_db_t *db) { UNUSED(db); return (ISC_FALSE); } static unsigned int nodecount(dns_db_t *db) { UNUSED(db); return (0); } static isc_boolean_t ispersistent(dns_db_t *db) { UNUSED(db); return (ISC_TRUE); } static void overmem(dns_db_t *db, isc_boolean_t overmem) { UNUSED(db); UNUSED(overmem); } static dns_dbmethods_t sdb_methods = { attach, detach, beginload, endload, dump, currentversion, newversion, attachversion, closeversion, findnode, find, findzonecut, attachnode, detachnode, expirenode, printnode, createiterator, findrdataset, allrdatasets, addrdataset, subtractrdataset, deleterdataset, issecure, nodecount, ispersistent, overmem }; 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) { UNEXPECTED_ERROR(__FILE__, __LINE__, "isc_mutex_init() failed: %s", isc_result_totext(result)); result = ISC_R_UNEXPECTED; 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, ISC_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: 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 methods = { disassociate, isc__rdatalist_first, isc__rdatalist_next, isc__rdatalist_current, rdataset_clone, isc__rdatalist_count }; 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 = &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); 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); }