/*
* 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);
#ifdef HAVE_DLCLOSE
if (cd->dl_handle)
dlclose(cd->dl_handle);
#endif
(void) isc_mutex_destroy(&cd->lock);
mctx = cd->mctx;
isc_mem_put(mctx, cd, sizeof(*cd));
isc_mem_destroy(&mctx);
}
/*
* 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);
DESTROYLOCK(&cd->lock);
mctx = cd->mctx;
isc_mem_put(mctx, cd, sizeof(*cd));
isc_mem_destroy(&mctx);
}
static isc_result_t
dlopen_dlz_findzonedb(void *driverarg, void *dbdata, const char *name)
{
dlopen_data_t *cd = (dlopen_data_t *) dbdata;
isc_result_t result;
UNUSED(driverarg);
MAYBE_LOCK(cd);
result = cd->dlz_findzonedb(cd->dbdata, name);
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)
{
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);
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);
}
/*
* Called to end a transaction
*/
static void
dlopen_dlz_closeversion(const char *zone, isc_boolean_t 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 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);
}
/*
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 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);
}
/*
* Called on startup to configure any writeable zones
*/
static isc_result_t
dlopen_dlz_configure(dns_view_t *view, 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 = ISC_TRUE;
result = cd->dlz_configure(view, cd->dbdata);
cd->in_configure = ISC_FALSE;
MAYBE_UNLOCK(cd);
return (result);
}
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);
}
/*
* Check for authority to change a name
*/
static isc_boolean_t
dlopen_dlz_ssumatch(const char *signer, const char *name, const char *tcpaddr,
const char *type, const char *key, isc_uint32_t keydatalen,
unsigned char *keydata, void *driverarg, void *dbdata)
{
dlopen_data_t *cd = (dlopen_data_t *) dbdata;
isc_boolean_t ret;
UNUSED(driverarg);
if (cd->dlz_ssumatch == NULL)
return (ISC_FALSE);
MAYBE_LOCK(cd);
ret = cd->dlz_ssumatch(signer, name, tcpaddr, type, key, keydatalen,
keydata, cd->dbdata);
MAYBE_UNLOCK(cd);
return (ret);
}
/*
* 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;
int dlopen_flags = 0;
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);
}
result = isc_mem_create(0, 0, &mctx);
if (result != ISC_R_SUCCESS)
return (result);
cd = isc_mem_get(mctx, sizeof(*cd));
if (cd == NULL) {
isc_mem_destroy(&mctx);
return (ISC_R_NOMEMORY);
}
memset(cd, 0, sizeof(*cd));
cd->mctx = mctx;
cd->dl_path = isc_mem_strdup(cd->mctx, argv[1]);
if (cd->dl_path == NULL) {
result = ISC_R_NOMEMORY;
goto failed;
}
cd->dlzname = isc_mem_strdup(cd->mctx, dlzname);
if (cd->dlzname == NULL) {
result = ISC_R_NOMEMORY;
goto failed;
}
/* Initialize the lock */
result = isc_mutex_init(&cd->lock);
if (result != ISC_R_SUCCESS)
goto failed;
/* Open the library */
dlopen_flags = RTLD_NOW|RTLD_GLOBAL;
#ifdef RTLD_DEEPBIND
/*
* If RTLD_DEEPBIND is available then use it. This can avoid
* issues with a module using a different version of a system
* library than one that bind9 uses. For example, bind9 may link
* to MIT kerberos, but the module may use Heimdal. If we don't
* use RTLD_DEEPBIND then we could end up with Heimdal functions
* calling MIT functions, which leads to bizarre results (usually
* a segfault).
*/
dlopen_flags |= RTLD_DEEPBIND;
#endif
cd->dl_handle = dlopen(cd->dl_path, dlopen_flags);
if (cd->dl_handle == NULL) {
dlopen_log(ISC_LOG_ERROR,
"dlz_dlopen failed to open library '%s' - %s",
cd->dl_path, dlerror());
result = ISC_R_FAILURE;
goto failed;
}
/* Find the symbols */
cd->dlz_version = (dlz_dlopen_version_t *)
dl_load_symbol(cd, "dlz_version", ISC_TRUE);
cd->dlz_create = (dlz_dlopen_create_t *)
dl_load_symbol(cd, "dlz_create", ISC_TRUE);
cd->dlz_lookup = (dlz_dlopen_lookup_t *)
dl_load_symbol(cd, "dlz_lookup", ISC_TRUE);
cd->dlz_findzonedb = (dlz_dlopen_findzonedb_t *)
dl_load_symbol(cd, "dlz_findzonedb", ISC_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 failed;
}
cd->dlz_allowzonexfr = (dlz_dlopen_allowzonexfr_t *)
dl_load_symbol(cd, "dlz_allowzonexfr", ISC_FALSE);
cd->dlz_allnodes = (dlz_dlopen_allnodes_t *)
dl_load_symbol(cd, "dlz_allnodes",
ISC_TF(cd->dlz_allowzonexfr != NULL));
cd->dlz_authority = (dlz_dlopen_authority_t *)
dl_load_symbol(cd, "dlz_authority", ISC_FALSE);
cd->dlz_newversion = (dlz_dlopen_newversion_t *)
dl_load_symbol(cd, "dlz_newversion", ISC_FALSE);
cd->dlz_closeversion = (dlz_dlopen_closeversion_t *)
dl_load_symbol(cd, "dlz_closeversion",
ISC_TF(cd->dlz_newversion != NULL));
cd->dlz_configure = (dlz_dlopen_configure_t *)
dl_load_symbol(cd, "dlz_configure", ISC_FALSE);
cd->dlz_ssumatch = (dlz_dlopen_ssumatch_t *)
dl_load_symbol(cd, "dlz_ssumatch", ISC_FALSE);
cd->dlz_addrdataset = (dlz_dlopen_addrdataset_t *)
dl_load_symbol(cd, "dlz_addrdataset", ISC_FALSE);
cd->dlz_subrdataset = (dlz_dlopen_subrdataset_t *)
dl_load_symbol(cd, "dlz_subrdataset", ISC_FALSE);
cd->dlz_delrdataset = (dlz_dlopen_delrdataset_t *)
dl_load_symbol(cd, "dlz_delrdataset", ISC_FALSE);
cd->dlz_destroy = (dlz_dlopen_destroy_t *)
dl_load_symbol(cd, "dlz_destroy", ISC_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 failed;
}
/*
* 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 failed;
*dbdata = cd;
return (ISC_R_SUCCESS);
failed:
dlopen_log(ISC_LOG_ERROR, "dlz_dlopen of '%s' failed", dlzname);
if (cd->dl_path != NULL)
isc_mem_free(mctx, cd->dl_path);
if (cd->dlzname != NULL)
isc_mem_free(mctx, cd->dlzname);
if (dlopen_flags != 0)
(void) isc_mutex_destroy(&cd->lock);
#ifdef HAVE_DLCLOSE
if (cd->dl_handle)
dlclose(cd->dl_handle);
#endif
isc_mem_put(mctx, cd, sizeof(*cd));
isc_mem_destroy(&mctx);
return (result);
}
/*
* 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;
isc_boolean_t triedload = ISC_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(0, 0, &mctx);
cd = isc_mem_get(mctx, sizeof(*cd));
if (cd == NULL) {
isc_mem_destroy(&mctx);
return (ISC_R_NOMEMORY);
}
memset(cd, 0, sizeof(*cd));
cd->mctx = mctx;
cd->dl_path = isc_mem_strdup(cd->mctx, argv[1]);
if (cd->dl_path == NULL) {
goto failed;
}
cd->dlzname = isc_mem_strdup(cd->mctx, dlzname);
if (cd->dlzname == NULL) {
goto failed;
}
triedload = ISC_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);
goto failed;
}
/* Find the symbols */
cd->dlz_version = (dlz_dlopen_version_t *)
dl_load_symbol(cd, "dlz_version", ISC_TRUE);
cd->dlz_create = (dlz_dlopen_create_t *)
dl_load_symbol(cd, "dlz_create", ISC_TRUE);
cd->dlz_lookup = (dlz_dlopen_lookup_t *)
dl_load_symbol(cd, "dlz_lookup", ISC_TRUE);
cd->dlz_findzonedb = (dlz_dlopen_findzonedb_t *)
dl_load_symbol(cd, "dlz_findzonedb", ISC_TRUE);
if (cd->dlz_create == NULL ||
cd->dlz_lookup == NULL ||
cd->dlz_findzonedb == NULL)
{
/* We're missing a required symbol */
goto failed;
}
cd->dlz_allowzonexfr = (dlz_dlopen_allowzonexfr_t *)
dl_load_symbol(cd, "dlz_allowzonexfr", ISC_FALSE);
cd->dlz_allnodes = (dlz_dlopen_allnodes_t *)
dl_load_symbol(cd, "dlz_allnodes",
ISC_TF(cd->dlz_allowzonexfr != NULL));
cd->dlz_authority = (dlz_dlopen_authority_t *)
dl_load_symbol(cd, "dlz_authority", ISC_FALSE);
cd->dlz_newversion = (dlz_dlopen_newversion_t *)
dl_load_symbol(cd, "dlz_newversion", ISC_FALSE);
cd->dlz_closeversion = (dlz_dlopen_closeversion_t *)
dl_load_symbol(cd, "dlz_closeversion",
ISC_TF(cd->dlz_newversion != NULL));
cd->dlz_configure = (dlz_dlopen_configure_t *)
dl_load_symbol(cd, "dlz_configure", ISC_FALSE);
cd->dlz_ssumatch = (dlz_dlopen_ssumatch_t *)
dl_load_symbol(cd, "dlz_ssumatch", ISC_FALSE);
cd->dlz_addrdataset = (dlz_dlopen_addrdataset_t *)
dl_load_symbol(cd, "dlz_addrdataset", ISC_FALSE);
cd->dlz_subrdataset = (dlz_dlopen_subrdataset_t *)
dl_load_symbol(cd, "dlz_subrdataset", ISC_FALSE);
cd->dlz_delrdataset = (dlz_dlopen_delrdataset_t *)
dl_load_symbol(cd, "dlz_delrdataset", ISC_FALSE);
/* Check the version of the API is the same */
cd->version = cd->dlz_version(&cd->flags);
if (cd->version != DLZ_DLOPEN_VERSION) {
dlopen_log(ISC_LOG_ERROR,
"dlz_dlopen: incorrect version %d "
"should be %d in '%s'",
cd->version, DLZ_DLOPEN_VERSION, cd->dl_path);
goto failed;
}
/*
* 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 failed;
*dbdata = cd;
return (ISC_R_SUCCESS);
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)
(void) 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);
}
