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-rw-r--r--bin/named/win32/dlz_dlopen_driver.c578
1 files changed, 578 insertions, 0 deletions
diff --git a/bin/named/win32/dlz_dlopen_driver.c b/bin/named/win32/dlz_dlopen_driver.c
new file mode 100644
index 0000000..7e41e9c
--- /dev/null
+++ b/bin/named/win32/dlz_dlopen_driver.c
@@ -0,0 +1,578 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * 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 https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <windows.h>
+
+#include <isc/mem.h>
+#include <isc/print.h>
+#include <isc/result.h>
+#include <isc/util.h>
+
+#include <dns/dlz_dlopen.h>
+#include <dns/log.h>
+#include <dns/result.h>
+
+#include <dlz/dlz_dlopen_driver.h>
+#include <named/globals.h>
+
+#ifdef ISC_DLZ_DLOPEN
+static dns_sdlzimplementation_t *dlz_dlopen = NULL;
+
+typedef struct dlopen_data {
+ isc_mem_t *mctx;
+ char *dl_path;
+ char *dlzname;
+ HMODULE dl_handle;
+ void *dbdata;
+ unsigned int flags;
+ isc_mutex_t lock;
+ int version;
+ bool in_configure;
+
+ dlz_dlopen_version_t *dlz_version;
+ dlz_dlopen_create_t *dlz_create;
+ dlz_dlopen_findzonedb_t *dlz_findzonedb;
+ dlz_dlopen_lookup_t *dlz_lookup;
+ dlz_dlopen_authority_t *dlz_authority;
+ dlz_dlopen_allnodes_t *dlz_allnodes;
+ dlz_dlopen_allowzonexfr_t *dlz_allowzonexfr;
+ dlz_dlopen_newversion_t *dlz_newversion;
+ dlz_dlopen_closeversion_t *dlz_closeversion;
+ dlz_dlopen_configure_t *dlz_configure;
+ dlz_dlopen_ssumatch_t *dlz_ssumatch;
+ dlz_dlopen_addrdataset_t *dlz_addrdataset;
+ dlz_dlopen_subrdataset_t *dlz_subrdataset;
+ dlz_dlopen_delrdataset_t *dlz_delrdataset;
+ dlz_dlopen_destroy_t *dlz_destroy;
+} dlopen_data_t;
+
+/* Modules can choose whether they are lock-safe or not. */
+#define MAYBE_LOCK(cd) \
+ do { \
+ if ((cd->flags & DNS_SDLZFLAG_THREADSAFE) == 0 && \
+ !cd->in_configure) \
+ LOCK(&cd->lock); \
+ } while (0)
+
+#define MAYBE_UNLOCK(cd) \
+ do { \
+ if ((cd->flags & DNS_SDLZFLAG_THREADSAFE) == 0 && \
+ !cd->in_configure) \
+ UNLOCK(&cd->lock); \
+ } while (0)
+
+/*
+ * Log a message at the given level.
+ */
+static void
+dlopen_log(int level, const char *fmt, ...) {
+ va_list ap;
+ va_start(ap, fmt);
+ isc_log_vwrite(dns_lctx, DNS_LOGCATEGORY_DATABASE, DNS_LOGMODULE_DLZ,
+ ISC_LOG_DEBUG(level), fmt, ap);
+ va_end(ap);
+}
+
+/*
+ * SDLZ methods
+ */
+
+static isc_result_t
+dlopen_dlz_allnodes(const char *zone, void *driverarg, void *dbdata,
+ dns_sdlzallnodes_t *allnodes) {
+ dlopen_data_t *cd = (dlopen_data_t *)dbdata;
+ isc_result_t result;
+
+ UNUSED(driverarg);
+
+ if (cd->dlz_allnodes == NULL) {
+ return (ISC_R_NOPERM);
+ }
+
+ MAYBE_LOCK(cd);
+ result = cd->dlz_allnodes(zone, cd->dbdata, allnodes);
+ MAYBE_UNLOCK(cd);
+ return (result);
+}
+
+static isc_result_t
+dlopen_dlz_allowzonexfr(void *driverarg, void *dbdata, const char *name,
+ const char *client) {
+ dlopen_data_t *cd = (dlopen_data_t *)dbdata;
+ isc_result_t result;
+
+ UNUSED(driverarg);
+
+ if (cd->dlz_allowzonexfr == NULL) {
+ return (ISC_R_NOPERM);
+ }
+
+ MAYBE_LOCK(cd);
+ result = cd->dlz_allowzonexfr(cd->dbdata, name, client);
+ MAYBE_UNLOCK(cd);
+ return (result);
+}
+
+static isc_result_t
+dlopen_dlz_authority(const char *zone, void *driverarg, void *dbdata,
+ dns_sdlzlookup_t *lookup) {
+ dlopen_data_t *cd = (dlopen_data_t *)dbdata;
+ isc_result_t result;
+
+ UNUSED(driverarg);
+
+ if (cd->dlz_authority == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ MAYBE_LOCK(cd);
+ result = cd->dlz_authority(zone, cd->dbdata, lookup);
+ MAYBE_UNLOCK(cd);
+ return (result);
+}
+
+static isc_result_t
+dlopen_dlz_findzonedb(void *driverarg, void *dbdata, const char *name,
+ dns_clientinfomethods_t *methods,
+ dns_clientinfo_t *clientinfo) {
+ dlopen_data_t *cd = (dlopen_data_t *)dbdata;
+ isc_result_t result;
+
+ UNUSED(driverarg);
+
+ MAYBE_LOCK(cd);
+ result = cd->dlz_findzonedb(cd->dbdata, name, methods, clientinfo);
+ MAYBE_UNLOCK(cd);
+ return (result);
+}
+
+static isc_result_t
+dlopen_dlz_lookup(const char *zone, const char *name, void *driverarg,
+ void *dbdata, dns_sdlzlookup_t *lookup,
+ dns_clientinfomethods_t *methods,
+ dns_clientinfo_t *clientinfo) {
+ dlopen_data_t *cd = (dlopen_data_t *)dbdata;
+ isc_result_t result;
+
+ UNUSED(driverarg);
+
+ MAYBE_LOCK(cd);
+ result = cd->dlz_lookup(zone, name, cd->dbdata, lookup, methods,
+ clientinfo);
+ MAYBE_UNLOCK(cd);
+ return (result);
+}
+
+/*
+ * Load a symbol from the library
+ */
+static void *
+dl_load_symbol(dlopen_data_t *cd, const char *symbol, bool mandatory) {
+ void *ptr = GetProcAddress(cd->dl_handle, symbol);
+ if (ptr == NULL && mandatory) {
+ dlopen_log(ISC_LOG_ERROR,
+ "dlz_dlopen: library '%s' is missing "
+ "required symbol '%s'",
+ cd->dl_path, symbol);
+ }
+ return (ptr);
+}
+
+/*
+ * Called at startup for each dlopen zone in named.conf
+ */
+static isc_result_t
+dlopen_dlz_create(const char *dlzname, unsigned int argc, char *argv[],
+ void *driverarg, void **dbdata) {
+ dlopen_data_t *cd;
+ isc_mem_t *mctx = NULL;
+ isc_result_t result = ISC_R_FAILURE;
+ bool triedload = false;
+
+ UNUSED(driverarg);
+
+ if (argc < 2) {
+ dlopen_log(ISC_LOG_ERROR,
+ "dlz_dlopen driver for '%s' needs a path to "
+ "the shared library",
+ dlzname);
+ return (ISC_R_FAILURE);
+ }
+
+ isc_mem_create(&mctx);
+
+ cd = isc_mem_get(mctx, sizeof(*cd));
+ memset(cd, 0, sizeof(*cd));
+
+ cd->mctx = mctx;
+
+ cd->dl_path = isc_mem_strdup(cd->mctx, argv[1]);
+
+ cd->dlzname = isc_mem_strdup(cd->mctx, dlzname);
+
+ triedload = true;
+
+ /* Initialize the lock */
+ isc_mutex_init(&cd->lock);
+
+ /* Open the library */
+ cd->dl_handle = LoadLibraryA(cd->dl_path);
+ if (cd->dl_handle == NULL) {
+ unsigned int error = GetLastError();
+
+ dlopen_log(ISC_LOG_ERROR,
+ "dlz_dlopen failed to open library '%s' - %u",
+ cd->dl_path, error);
+ result = ISC_R_FAILURE;
+ goto cleanup_lock;
+ }
+
+ /* Find the symbols */
+ cd->dlz_version =
+ (dlz_dlopen_version_t *)dl_load_symbol(cd, "dlz_version", true);
+ cd->dlz_create = (dlz_dlopen_create_t *)dl_load_symbol(cd, "dlz_create",
+ true);
+ cd->dlz_lookup = (dlz_dlopen_lookup_t *)dl_load_symbol(cd, "dlz_lookup",
+ true);
+ cd->dlz_findzonedb = (dlz_dlopen_findzonedb_t *)dl_load_symbol(
+ cd, "dlz_findzonedb", true);
+
+ if (cd->dlz_create == NULL || cd->dlz_version == NULL ||
+ cd->dlz_lookup == NULL || cd->dlz_findzonedb == NULL)
+ {
+ /* We're missing a required symbol */
+ result = ISC_R_FAILURE;
+ goto cleanup_lock;
+ }
+
+ cd->dlz_allowzonexfr = (dlz_dlopen_allowzonexfr_t *)dl_load_symbol(
+ cd, "dlz_allowzonexfr", false);
+ cd->dlz_allnodes = (dlz_dlopen_allnodes_t *)dl_load_symbol(
+ cd, "dlz_allnodes", (cd->dlz_allowzonexfr != NULL));
+ cd->dlz_authority = (dlz_dlopen_authority_t *)dl_load_symbol(
+ cd, "dlz_authority", false);
+ cd->dlz_newversion = (dlz_dlopen_newversion_t *)dl_load_symbol(
+ cd, "dlz_newversion", false);
+ cd->dlz_closeversion = (dlz_dlopen_closeversion_t *)dl_load_symbol(
+ cd, "dlz_closeversion", (cd->dlz_newversion != NULL));
+ cd->dlz_configure = (dlz_dlopen_configure_t *)dl_load_symbol(
+ cd, "dlz_configure", false);
+ cd->dlz_ssumatch = (dlz_dlopen_ssumatch_t *)dl_load_symbol(
+ cd, "dlz_ssumatch", false);
+ cd->dlz_addrdataset = (dlz_dlopen_addrdataset_t *)dl_load_symbol(
+ cd, "dlz_addrdataset", false);
+ cd->dlz_subrdataset = (dlz_dlopen_subrdataset_t *)dl_load_symbol(
+ cd, "dlz_subrdataset", false);
+ cd->dlz_delrdataset = (dlz_dlopen_delrdataset_t *)dl_load_symbol(
+ cd, "dlz_delrdataset", false);
+
+ /* Check the version of the API is the same */
+ cd->version = cd->dlz_version(&cd->flags);
+ if (cd->version < (DLZ_DLOPEN_VERSION - DLZ_DLOPEN_AGE) ||
+ cd->version > DLZ_DLOPEN_VERSION)
+ {
+ dlopen_log(ISC_LOG_ERROR,
+ "dlz_dlopen: %s: incorrect driver API version %d, "
+ "requires %d",
+ cd->dl_path, cd->version, DLZ_DLOPEN_VERSION);
+ result = ISC_R_FAILURE;
+ goto cleanup_lock;
+ }
+
+ /*
+ * Call the library's create function. Note that this is an
+ * extended version of dlz create, with the addition of
+ * named function pointers for helper functions that the
+ * driver will need. This avoids the need for the backend to
+ * link the BIND9 libraries
+ */
+ MAYBE_LOCK(cd);
+ result = cd->dlz_create(dlzname, argc - 1, argv + 1, &cd->dbdata, "log",
+ dlopen_log, "putrr", dns_sdlz_putrr,
+ "putnamedrr", dns_sdlz_putnamedrr,
+ "writeable_zone", dns_dlz_writeablezone, NULL);
+ MAYBE_UNLOCK(cd);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup_lock;
+ }
+
+ *dbdata = cd;
+
+ return (ISC_R_SUCCESS);
+
+cleanup_lock:
+ isc_mutex_destroy(&cd->lock);
+failed:
+ dlopen_log(ISC_LOG_ERROR, "dlz_dlopen of '%s' failed", dlzname);
+ if (cd->dl_path) {
+ isc_mem_free(mctx, cd->dl_path);
+ }
+ if (cd->dlzname) {
+ isc_mem_free(mctx, cd->dlzname);
+ }
+ if (triedload) {
+ isc_mutex_destroy(&cd->lock);
+ }
+ if (cd->dl_handle) {
+ FreeLibrary(cd->dl_handle);
+ }
+ isc_mem_put(mctx, cd, sizeof(*cd));
+ isc_mem_destroy(&mctx);
+ return (result);
+}
+
+/*
+ * Called when bind is shutting down
+ */
+static void
+dlopen_dlz_destroy(void *driverarg, void *dbdata) {
+ dlopen_data_t *cd = (dlopen_data_t *)dbdata;
+ isc_mem_t *mctx;
+
+ UNUSED(driverarg);
+
+ if (cd->dlz_destroy) {
+ MAYBE_LOCK(cd);
+ cd->dlz_destroy(cd->dbdata);
+ MAYBE_UNLOCK(cd);
+ }
+
+ if (cd->dl_path) {
+ isc_mem_free(cd->mctx, cd->dl_path);
+ }
+ if (cd->dlzname) {
+ isc_mem_free(cd->mctx, cd->dlzname);
+ }
+
+ if (cd->dl_handle) {
+ FreeLibrary(cd->dl_handle);
+ }
+
+ isc_mutex_destroy(&cd->lock);
+
+ mctx = cd->mctx;
+ isc_mem_put(mctx, cd, sizeof(*cd));
+ isc_mem_destroy(&mctx);
+}
+
+/*
+ * Called to start a transaction
+ */
+static isc_result_t
+dlopen_dlz_newversion(const char *zone, void *driverarg, void *dbdata,
+ void **versionp) {
+ dlopen_data_t *cd = (dlopen_data_t *)dbdata;
+ isc_result_t result;
+
+ UNUSED(driverarg);
+
+ if (cd->dlz_newversion == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ MAYBE_LOCK(cd);
+ result = cd->dlz_newversion(zone, cd->dbdata, versionp);
+ MAYBE_UNLOCK(cd);
+ return (result);
+}
+
+/*
+ * Called to end a transaction
+ */
+static void
+dlopen_dlz_closeversion(const char *zone, bool commit, void *driverarg,
+ void *dbdata, void **versionp) {
+ dlopen_data_t *cd = (dlopen_data_t *)dbdata;
+
+ UNUSED(driverarg);
+
+ if (cd->dlz_newversion == NULL) {
+ *versionp = NULL;
+ return;
+ }
+
+ MAYBE_LOCK(cd);
+ cd->dlz_closeversion(zone, commit, cd->dbdata, versionp);
+ MAYBE_UNLOCK(cd);
+}
+
+/*
+ * Called on startup to configure any writeable zones
+ */
+static isc_result_t
+dlopen_dlz_configure(dns_view_t *view, dns_dlzdb_t *dlzdb, void *driverarg,
+ void *dbdata) {
+ dlopen_data_t *cd = (dlopen_data_t *)dbdata;
+ isc_result_t result;
+
+ UNUSED(driverarg);
+
+ if (cd->dlz_configure == NULL) {
+ return (ISC_R_SUCCESS);
+ }
+
+ MAYBE_LOCK(cd);
+ cd->in_configure = true;
+ result = cd->dlz_configure(view, dlzdb, cd->dbdata);
+ cd->in_configure = false;
+ MAYBE_UNLOCK(cd);
+
+ return (result);
+}
+
+/*
+ * Check for authority to change a name
+ */
+static bool
+dlopen_dlz_ssumatch(const char *signer, const char *name, const char *tcpaddr,
+ const char *type, const char *key, uint32_t keydatalen,
+ unsigned char *keydata, void *driverarg, void *dbdata) {
+ dlopen_data_t *cd = (dlopen_data_t *)dbdata;
+ bool ret;
+
+ UNUSED(driverarg);
+
+ if (cd->dlz_ssumatch == NULL) {
+ return (false);
+ }
+
+ MAYBE_LOCK(cd);
+ ret = cd->dlz_ssumatch(signer, name, tcpaddr, type, key, keydatalen,
+ keydata, cd->dbdata);
+ MAYBE_UNLOCK(cd);
+
+ return (ret);
+}
+
+/*
+ * Add an rdataset
+ */
+static isc_result_t
+dlopen_dlz_addrdataset(const char *name, const char *rdatastr, void *driverarg,
+ void *dbdata, void *version) {
+ dlopen_data_t *cd = (dlopen_data_t *)dbdata;
+ isc_result_t result;
+
+ UNUSED(driverarg);
+
+ if (cd->dlz_addrdataset == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ MAYBE_LOCK(cd);
+ result = cd->dlz_addrdataset(name, rdatastr, cd->dbdata, version);
+ MAYBE_UNLOCK(cd);
+
+ return (result);
+}
+
+/*
+ * Subtract an rdataset
+ */
+static isc_result_t
+dlopen_dlz_subrdataset(const char *name, const char *rdatastr, void *driverarg,
+ void *dbdata, void *version) {
+ dlopen_data_t *cd = (dlopen_data_t *)dbdata;
+ isc_result_t result;
+
+ UNUSED(driverarg);
+
+ if (cd->dlz_subrdataset == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ MAYBE_LOCK(cd);
+ result = cd->dlz_subrdataset(name, rdatastr, cd->dbdata, version);
+ MAYBE_UNLOCK(cd);
+
+ return (result);
+}
+
+/*
+ * delete a rdataset
+ */
+static isc_result_t
+dlopen_dlz_delrdataset(const char *name, const char *type, void *driverarg,
+ void *dbdata, void *version) {
+ dlopen_data_t *cd = (dlopen_data_t *)dbdata;
+ isc_result_t result;
+
+ UNUSED(driverarg);
+
+ if (cd->dlz_delrdataset == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ MAYBE_LOCK(cd);
+ result = cd->dlz_delrdataset(name, type, cd->dbdata, version);
+ MAYBE_UNLOCK(cd);
+
+ return (result);
+}
+
+static dns_sdlzmethods_t dlz_dlopen_methods = {
+ dlopen_dlz_create, dlopen_dlz_destroy, dlopen_dlz_findzonedb,
+ dlopen_dlz_lookup, dlopen_dlz_authority, dlopen_dlz_allnodes,
+ dlopen_dlz_allowzonexfr, dlopen_dlz_newversion, dlopen_dlz_closeversion,
+ dlopen_dlz_configure, dlopen_dlz_ssumatch, dlopen_dlz_addrdataset,
+ dlopen_dlz_subrdataset, dlopen_dlz_delrdataset
+};
+#endif /* ifdef ISC_DLZ_DLOPEN */
+
+/*
+ * Register driver with BIND
+ */
+isc_result_t
+dlz_dlopen_init(isc_mem_t *mctx) {
+#ifndef ISC_DLZ_DLOPEN
+ UNUSED(mctx);
+ return (ISC_R_NOTIMPLEMENTED);
+#else /* ifndef ISC_DLZ_DLOPEN */
+ isc_result_t result;
+
+ dlopen_log(2, "Registering DLZ_dlopen driver");
+
+ result = dns_sdlzregister("dlopen", &dlz_dlopen_methods, NULL,
+ DNS_SDLZFLAG_RELATIVEOWNER |
+ DNS_SDLZFLAG_RELATIVERDATA |
+ DNS_SDLZFLAG_THREADSAFE,
+ mctx, &dlz_dlopen);
+
+ if (result != ISC_R_SUCCESS) {
+ UNEXPECTED_ERROR(__FILE__, __LINE__,
+ "dns_sdlzregister() failed: %s",
+ isc_result_totext(result));
+ result = ISC_R_UNEXPECTED;
+ }
+
+ return (result);
+#endif /* ifndef ISC_DLZ_DLOPEN */
+}
+
+/*
+ * Unregister the driver
+ */
+void
+dlz_dlopen_clear(void) {
+#ifdef ISC_DLZ_DLOPEN
+ dlopen_log(2, "Unregistering DLZ_dlopen driver");
+ if (dlz_dlopen != NULL) {
+ dns_sdlzunregister(&dlz_dlopen);
+ }
+#endif /* ifdef ISC_DLZ_DLOPEN */
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 09:26:25 +0000