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diff --git a/lib/dns/dlz.c b/lib/dns/dlz.c
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+/*
+ * Portions Copyright (C) 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
+ * Portions Copyright (C) 1999-2001 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.
+ */
+
+/*
+ * Copyright (C) 2002 Stichting NLnet, Netherlands, stichting@nlnet.nl.
+ *
+ * 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 STICHTING NLNET
+ * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+ * STICHTING NLNET 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.
+ *
+ * The development of Dynamically Loadable Zones (DLZ) for Bind 9 was
+ * conceived and contributed by Rob Butler.
+ *
+ * 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 ROB BUTLER
+ * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+ * ROB BUTLER 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: dlz.c,v 1.5 2007/06/19 23:47:16 tbox Exp $ */
+
+/*! \file */
+
+/***
+ *** Imports
+ ***/
+
+#include <config.h>
+
+#include <dns/fixedname.h>
+#include <dns/log.h>
+#include <dns/master.h>
+#include <dns/dlz.h>
+
+
+#include <isc/buffer.h>
+#include <isc/magic.h>
+#include <isc/mem.h>
+#include <isc/once.h>
+#include <isc/rwlock.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+/***
+ *** Supported DLZ DB Implementations Registry
+ ***/
+
+static ISC_LIST(dns_dlzimplementation_t) dlz_implementations;
+static isc_rwlock_t dlz_implock;
+static isc_once_t once = ISC_ONCE_INIT;
+
+static void
+dlz_initialize(void) {
+ RUNTIME_CHECK(isc_rwlock_init(&dlz_implock, 0, 0) == ISC_R_SUCCESS);
+ ISC_LIST_INIT(dlz_implementations);
+}
+
+/*%
+ * Searches the dlz_implementations list for a driver matching name.
+ */
+static inline dns_dlzimplementation_t *
+dlz_impfind(const char *name) {
+ dns_dlzimplementation_t *imp;
+
+ for (imp = ISC_LIST_HEAD(dlz_implementations);
+ imp != NULL;
+ imp = ISC_LIST_NEXT(imp, link))
+ if (strcasecmp(name, imp->name) == 0)
+ return (imp);
+ return (NULL);
+}
+
+/***
+ *** Basic DLZ Methods
+ ***/
+
+isc_result_t
+dns_dlzallowzonexfr(dns_view_t *view, dns_name_t *name,
+ isc_sockaddr_t *clientaddr, dns_db_t **dbp)
+{
+ isc_result_t result;
+ dns_dlzallowzonexfr_t allowzonexfr;
+ dns_dlzdb_t *dlzdatabase;
+
+ /*
+ * Performs checks to make sure data is as we expect it to be.
+ */
+ REQUIRE(DNS_DLZ_VALID(view->dlzdatabase));
+ REQUIRE(name != NULL);
+ REQUIRE(dbp != NULL && *dbp == NULL);
+
+ /* ask driver if the zone is supported */
+ dlzdatabase = view->dlzdatabase;
+ allowzonexfr = dlzdatabase->implementation->methods->allowzonexfr;
+ result = (*allowzonexfr)(dlzdatabase->implementation->driverarg,
+ dlzdatabase->dbdata, dlzdatabase->mctx,
+ view->rdclass, name, clientaddr, dbp);
+
+ if (result == ISC_R_NOTIMPLEMENTED)
+ return (ISC_R_NOTFOUND);
+ return (result);
+}
+
+isc_result_t
+dns_dlzcreate(isc_mem_t *mctx, const char *dlzname, const char *drivername,
+ unsigned int argc, char *argv[], dns_dlzdb_t **dbp)
+{
+ dns_dlzimplementation_t *impinfo;
+ isc_result_t result;
+
+ /*
+ * initialize the dlz_implementations list, this is guaranteed
+ * to only really happen once.
+ */
+ RUNTIME_CHECK(isc_once_do(&once, dlz_initialize) == ISC_R_SUCCESS);
+
+ /*
+ * Performs checks to make sure data is as we expect it to be.
+ */
+ REQUIRE(dbp != NULL && *dbp == NULL);
+ REQUIRE(dlzname != NULL);
+ REQUIRE(drivername != NULL);
+ REQUIRE(mctx != NULL);
+
+ /* write log message */
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_DLZ, ISC_LOG_INFO,
+ "Loading '%s' using driver %s", dlzname, drivername);
+
+ /* lock the dlz_implementations list so we can search it. */
+ RWLOCK(&dlz_implock, isc_rwlocktype_read);
+
+ /* search for the driver implementation */
+ impinfo = dlz_impfind(drivername);
+ if (impinfo == NULL) {
+ RWUNLOCK(&dlz_implock, isc_rwlocktype_read);
+
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
+ "unsupported DLZ database driver '%s'."
+ " %s not loaded.",
+ drivername, dlzname);
+
+ return (ISC_R_NOTFOUND);
+ }
+
+ /* Allocate memory to hold the DLZ database driver */
+ (*dbp) = isc_mem_get(mctx, sizeof(dns_dlzdb_t));
+ if ((*dbp) == NULL) {
+ RWUNLOCK(&dlz_implock, isc_rwlocktype_read);
+ return (ISC_R_NOMEMORY);
+ }
+
+ /* Make sure memory region is set to all 0's */
+ memset((*dbp), 0, sizeof(dns_dlzdb_t));
+
+ (*dbp)->implementation = impinfo;
+
+ /* Create a new database using implementation 'drivername'. */
+ result = ((impinfo->methods->create)(mctx, dlzname, argc, argv,
+ impinfo->driverarg,
+ &(*dbp)->dbdata));
+
+ /* mark the DLZ driver as valid */
+ if (result == ISC_R_SUCCESS) {
+ RWUNLOCK(&dlz_implock, isc_rwlocktype_read);
+ (*dbp)->magic = DNS_DLZ_MAGIC;
+ isc_mem_attach(mctx, &(*dbp)->mctx);
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(2),
+ "DLZ driver loaded successfully.");
+ return (ISC_R_SUCCESS);
+ } else {
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
+ "DLZ driver failed to load.");
+ }
+
+ /* impinfo->methods->create failed. */
+ RWUNLOCK(&dlz_implock, isc_rwlocktype_read);
+ isc_mem_put(mctx, (*dbp), sizeof(dns_dlzdb_t));
+ return (result);
+}
+
+void
+dns_dlzdestroy(dns_dlzdb_t **dbp) {
+ isc_mem_t *mctx;
+ dns_dlzdestroy_t destroy;
+
+ /* Write debugging message to log */
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(2),
+ "Unloading DLZ driver.");
+
+ /*
+ * Perform checks to make sure data is as we expect it to be.
+ */
+ REQUIRE(dbp != NULL && DNS_DLZ_VALID(*dbp));
+
+ /* call the drivers destroy method */
+ if ((*dbp) != NULL) {
+ mctx = (*dbp)->mctx;
+ destroy = (*dbp)->implementation->methods->destroy;
+ (*destroy)((*dbp)->implementation->driverarg,(*dbp)->dbdata);
+ /* return memory */
+ isc_mem_put(mctx, (*dbp), sizeof(dns_dlzdb_t));
+ isc_mem_detach(&mctx);
+ }
+
+ *dbp = NULL;
+}
+
+
+isc_result_t
+dns_dlzfindzone(dns_view_t *view, dns_name_t *name, unsigned int minlabels,
+ dns_db_t **dbp)
+{
+ dns_fixedname_t fname;
+ dns_name_t *zonename;
+ unsigned int namelabels;
+ unsigned int i;
+ isc_result_t result;
+ dns_dlzfindzone_t findzone;
+ dns_dlzdb_t *dlzdatabase;
+
+ /*
+ * Performs checks to make sure data is as we expect it to be.
+ */
+ REQUIRE(DNS_DLZ_VALID(view->dlzdatabase));
+ REQUIRE(name != NULL);
+ REQUIRE(dbp != NULL && *dbp == NULL);
+
+ /* setup a "fixed" dns name */
+ dns_fixedname_init(&fname);
+ zonename = dns_fixedname_name(&fname);
+
+ /* count the number of labels in the name */
+ namelabels = dns_name_countlabels(name);
+
+ /*
+ * loop through starting with the longest domain name and
+ * trying shorter names portions of the name until we find a
+ * match, have an error, or are below the 'minlabels'
+ * threshold. minlabels is 0, if the standard database didn't
+ * have a zone name match. Otherwise minlables is the number
+ * of labels in that name. We need to beat that for a
+ * "better" match for the DLZ database to be authoritative
+ * instead of the standard database.
+ */
+ for (i = namelabels; i > minlabels && i > 1; i--) {
+ if (i == namelabels) {
+ result = dns_name_copy(name, zonename, NULL);
+ if (result != ISC_R_SUCCESS)
+ return (result);
+ } else
+ dns_name_split(name, i, NULL, zonename);
+
+ /* ask SDLZ driver if the zone is supported */
+ dlzdatabase = view->dlzdatabase;
+ findzone = dlzdatabase->implementation->methods->findzone;
+ result = (*findzone)(dlzdatabase->implementation->driverarg,
+ dlzdatabase->dbdata, dlzdatabase->mctx,
+ view->rdclass, zonename, dbp);
+ if (result != ISC_R_NOTFOUND)
+ return (result);
+ }
+ return (ISC_R_NOTFOUND);
+}
+
+/*%
+ * Registers a DLZ driver. This basically just adds the dlz
+ * driver to the list of available drivers in the dlz_implementations list.
+ */
+isc_result_t
+dns_dlzregister(const char *drivername, const dns_dlzmethods_t *methods,
+ void *driverarg, isc_mem_t *mctx,
+ dns_dlzimplementation_t **dlzimp)
+{
+
+ dns_dlzimplementation_t *dlz_imp;
+
+ /* Write debugging message to log */
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(2),
+ "Registering DLZ driver '%s'", drivername);
+
+ /*
+ * Performs checks to make sure data is as we expect it to be.
+ */
+ REQUIRE(drivername != NULL);
+ REQUIRE(methods != NULL);
+ REQUIRE(methods->create != NULL);
+ REQUIRE(methods->destroy != NULL);
+ REQUIRE(methods->findzone != NULL);
+ REQUIRE(mctx != NULL);
+ REQUIRE(dlzimp != NULL && *dlzimp == NULL);
+
+ /*
+ * initialize the dlz_implementations list, this is guaranteed
+ * to only really happen once.
+ */
+ RUNTIME_CHECK(isc_once_do(&once, dlz_initialize) == ISC_R_SUCCESS);
+
+ /* lock the dlz_implementations list so we can modify it. */
+ RWLOCK(&dlz_implock, isc_rwlocktype_write);
+
+ /*
+ * check that another already registered driver isn't using
+ * the same name
+ */
+ dlz_imp = dlz_impfind(drivername);
+ if (dlz_imp != NULL) {
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(2),
+ "DLZ Driver '%s' already registered",
+ drivername);
+ RWUNLOCK(&dlz_implock, isc_rwlocktype_write);
+ return (ISC_R_EXISTS);
+ }
+
+ /*
+ * Allocate memory for a dlz_implementation object. Error if
+ * we cannot.
+ */
+ dlz_imp = isc_mem_get(mctx, sizeof(dns_dlzimplementation_t));
+ if (dlz_imp == NULL) {
+ RWUNLOCK(&dlz_implock, isc_rwlocktype_write);
+ return (ISC_R_NOMEMORY);
+ }
+
+ /* Make sure memory region is set to all 0's */
+ memset(dlz_imp, 0, sizeof(dns_dlzimplementation_t));
+
+ /* Store the data passed into this method */
+ dlz_imp->name = drivername;
+ dlz_imp->methods = methods;
+ dlz_imp->mctx = NULL;
+ dlz_imp->driverarg = driverarg;
+
+ /* attach the new dlz_implementation object to a memory context */
+ isc_mem_attach(mctx, &dlz_imp->mctx);
+
+ /*
+ * prepare the dlz_implementation object to be put in a list,
+ * and append it to the list
+ */
+ ISC_LINK_INIT(dlz_imp, link);
+ ISC_LIST_APPEND(dlz_implementations, dlz_imp, link);
+
+ /* Unlock the dlz_implementations list. */
+ RWUNLOCK(&dlz_implock, isc_rwlocktype_write);
+
+ /* Pass back the dlz_implementation that we created. */
+ *dlzimp = dlz_imp;
+
+ return (ISC_R_SUCCESS);
+}
+
+/*%
+ * Helper function for dns_dlzstrtoargv().
+ * Pardon the gratuitous recursion.
+ */
+static isc_result_t
+dns_dlzstrtoargvsub(isc_mem_t *mctx, char *s, unsigned int *argcp,
+ char ***argvp, unsigned int n)
+{
+ isc_result_t result;
+
+ restart:
+ /* Discard leading whitespace. */
+ while (*s == ' ' || *s == '\t')
+ s++;
+
+ if (*s == '\0') {
+ /* We have reached the end of the string. */
+ *argcp = n;
+ *argvp = isc_mem_get(mctx, n * sizeof(char *));
+ if (*argvp == NULL)
+ return (ISC_R_NOMEMORY);
+ } else {
+ char *p = s;
+ while (*p != ' ' && *p != '\t' && *p != '\0' && *p != '{') {
+ if (*p == '\n') {
+ *p = ' ';
+ goto restart;
+ }
+ p++;
+ }
+
+ /* do "grouping", items between { and } are one arg */
+ if (*p == '{') {
+ char *t = p;
+ /*
+ * shift all characters to left by 1 to get rid of '{'
+ */
+ while (*t != '\0') {
+ t++;
+ *(t-1) = *t;
+ }
+ while (*p != '\0' && *p != '}') {
+ p++;
+ }
+ /* get rid of '}' character */
+ if (*p == '}') {
+ *p = '\0';
+ p++;
+ }
+ /* normal case, no "grouping" */
+ } else if (*p != '\0')
+ *p++ = '\0';
+
+ result = dns_dlzstrtoargvsub(mctx, p, argcp, argvp, n + 1);
+ if (result != ISC_R_SUCCESS)
+ return (result);
+ (*argvp)[n] = s;
+ }
+ return (ISC_R_SUCCESS);
+}
+
+/*%
+ * Tokenize the string "s" into whitespace-separated words,
+ * return the number of words in '*argcp' and an array
+ * of pointers to the words in '*argvp'. The caller
+ * must free the array using isc_mem_put(). The string
+ * is modified in-place.
+ */
+isc_result_t
+dns_dlzstrtoargv(isc_mem_t *mctx, char *s,
+ unsigned int *argcp, char ***argvp)
+{
+ return(dns_dlzstrtoargvsub(mctx, s, argcp, argvp, 0));
+}
+
+/*%
+ * Unregisters a DLZ driver. This basically just removes the dlz
+ * driver from the list of available drivers in the dlz_implementations list.
+ */
+void
+dns_dlzunregister(dns_dlzimplementation_t **dlzimp) {
+ dns_dlzimplementation_t *dlz_imp;
+ isc_mem_t *mctx;
+
+ /* Write debugging message to log */
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(2),
+ "Unregistering DLZ driver.");
+
+ /*
+ * Performs checks to make sure data is as we expect it to be.
+ */
+ REQUIRE(dlzimp != NULL && *dlzimp != NULL);
+
+ /*
+ * initialize the dlz_implementations list, this is guaranteed
+ * to only really happen once.
+ */
+ RUNTIME_CHECK(isc_once_do(&once, dlz_initialize) == ISC_R_SUCCESS);
+
+ dlz_imp = *dlzimp;
+
+ /* lock the dlz_implementations list so we can modify it. */
+ RWLOCK(&dlz_implock, isc_rwlocktype_write);
+
+ /* remove the dlz_implementation object from the list */
+ ISC_LIST_UNLINK(dlz_implementations, dlz_imp, link);
+ mctx = dlz_imp->mctx;
+
+ /*
+ * return the memory back to the available memory pool and
+ * remove it from the memory context.
+ */
+ isc_mem_put(mctx, dlz_imp, sizeof(dns_dlzimplementation_t));
+ isc_mem_detach(&mctx);
+
+ /* Unlock the dlz_implementations list. */
+ RWUNLOCK(&dlz_implock, isc_rwlocktype_write);
+}
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