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/*
* Copyright (C) 2004-2009 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1996-2003 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.
*/
#include <isc/result.h>
#include <isc/types.h>
#include <isc/util.h>
#include <dns/dynamic_db.h>
#include <dns/log.h>
#include <dns/types.h>
/* TODO: Adjust configure.ac accordingly. */
#define HAVE_DLOPEN 1
#if HAVE_DLOPEN
#include <dlfcn.h>
#endif
#define CHECK(op) \
do { result = (op); \
if (result != ISC_R_SUCCESS) goto cleanup; \
} while (0)
typedef isc_result_t (*register_func_t)(isc_mem_t *mctx, const char *name,
const char * const *argv, dns_view_t *view);
#if HAVE_DLOPEN
static isc_result_t
load_library(const char *filename, register_func_t *register_function)
{
isc_result_t result;
void *handle; /* XXX: We don't keep the handle around. Should we? */
const char *errmsg;
REQUIRE(register_function != NULL && *register_function == NULL);
handle = dlopen(filename, RTLD_LAZY);
if (handle == NULL) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DYNDB, ISC_LOG_ERROR,
"Failed to dynamically load driver '%s': %s",
filename, dlerror());
CHECK(ISC_R_FAILURE);
}
dlerror();
*register_function = dlsym(handle, "dynamic_driver_init");
if (*register_function == NULL) {
errmsg = dlerror();
if (errmsg == NULL)
errmsg = "returned function pointer is NULL";
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DYNDB, ISC_LOG_ERROR,
"Failed to lookup symbol dynamic_driver_init from %s: %s",
filename, errmsg);
CHECK(ISC_R_FAILURE);
}
dlerror();
return ISC_R_SUCCESS;
cleanup:
if (handle != NULL)
dlclose(handle);
*register_function = NULL;
return result;
}
#else
static isc_result_t
load_library(const char *filename, register_func_t *register_function)
{
UNUSED(filename);
UNUSED(register_function);
return ISC_R_NOTIMPLEMENTED;
}
#endif
isc_result_t
dns_dynamic_db_load(const char *libname, const char *name, isc_mem_t *mctx,
const char * const *argv, dns_view_t *view)
{
isc_result_t result;
register_func_t register_func = NULL;
CHECK(load_library(libname, ®ister_func));
CHECK(register_func(mctx, name, argv, view));
cleanup:
return result;
}
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