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/*-
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "lua_common.h"
#include "lua_dns_resolver.h"
#include "lua_thread_pool.h"
LUA_FUNCTION_DEF (dns, request);
static const struct luaL_reg dns_f[] = {
LUA_INTERFACE_DEF (dns, request),
{"__tostring", rspamd_lua_class_tostring},
{NULL, NULL}
};
static const gchar *M = "rspamd lua dns";
void lua_dns_callback (struct rdns_reply *reply, void *arg);
struct lua_rspamd_dns_cbdata {
struct thread_entry *thread;
struct rspamd_task *task;
struct rspamd_dns_resolver *resolver;
struct rspamd_symcache_dynamic_item *item;
struct rspamd_async_session *s;
};
static gint
lua_dns_request (lua_State *L)
{
GError *err = NULL;
struct rspamd_async_session *session = NULL;
struct rspamd_config *cfg = NULL;
struct lua_rspamd_dns_cbdata *cbdata = NULL;
const gchar *to_resolve = NULL;
const gchar *type_str = NULL;
struct rspamd_task *task = NULL;
rspamd_mempool_t *pool = NULL;
gint ret = 0;
gboolean forced = FALSE;
/* Check arguments */
if (!rspamd_lua_parse_table_arguments (L, 1, &err,
RSPAMD_LUA_PARSE_ARGUMENTS_DEFAULT,
"*name=S;task=U{task};*type=S;forced=B;session=U{session};config=U{config}",
&to_resolve,
&task,
&type_str,
&forced,
&session,
&cfg)) {
if (err) {
ret = luaL_error (L, "invalid arguments: %s", err->message);
g_error_free (err);
return ret;
}
return luaL_error (L, "invalid arguments");
}
if (task) {
session = task->s;
pool = task->task_pool;
cfg = task->cfg;
}
else if (session && cfg) {
pool = cfg->cfg_pool;
}
else {
return luaL_error (L, "invalid arguments: either task or session/config should be set");
}
enum rdns_request_type type = rdns_type_fromstr (type_str);
if (type == RDNS_REQUEST_INVALID) {
return luaL_error (L, "invalid arguments: this record type is not supported");
}
cbdata = rspamd_mempool_alloc0 (pool, sizeof (*cbdata));
cbdata->task = task;
if (type == RDNS_REQUEST_PTR) {
char *ptr_str;
ptr_str = rdns_generate_ptr_from_str (to_resolve);
if (ptr_str == NULL) {
msg_err_task_check ("wrong resolve string to PTR request: %s",
to_resolve);
lua_pushnil (L);
return 1;
}
to_resolve = rspamd_mempool_strdup (pool, ptr_str);
free (ptr_str);
}
if (task == NULL) {
ret = (rspamd_dns_resolver_request (cfg->dns_resolver,
session,
pool,
lua_dns_callback,
cbdata,
type,
to_resolve) != NULL);
}
else {
if (forced) {
ret = rspamd_dns_resolver_request_task_forced (task,
lua_dns_callback,
cbdata,
type,
to_resolve);
}
else {
ret = rspamd_dns_resolver_request_task (task,
lua_dns_callback,
cbdata,
type,
to_resolve);
}
}
if (ret) {
cbdata->thread = lua_thread_pool_get_running_entry (cfg->lua_thread_pool);
cbdata->s = session;
if (task) {
cbdata->item = rspamd_symcache_get_cur_item (task);
rspamd_symcache_item_async_inc (task, cbdata->item, M);
}
return lua_thread_yield (cbdata->thread, 0);
}
else {
lua_pushnil (L);
return 1;
}
}
void
lua_dns_callback (struct rdns_reply *reply, void *arg)
{
struct lua_rspamd_dns_cbdata *cbdata = arg;
lua_State *L = cbdata->thread->lua_state;
if (reply->code != RDNS_RC_NOERROR) {
lua_pushboolean (L, false);
lua_pushstring (L, rdns_strerror (reply->code));
}
else {
lua_push_dns_reply (L, reply);
lua_pushboolean (L, reply->flags & RDNS_AUTH);
lua_setfield (L, -3, "authenticated");
lua_pushboolean (L, reply->flags & RDNS_TRUNCATED);
lua_setfield (L, -3, "truncated");
/* result 1 - not and error */
lua_pushboolean (L, true);
/* push table into stack, result 2 - results itself */
lua_pushvalue (L, -3);
}
lua_thread_resume (cbdata->thread, 2);
if (cbdata->item) {
rspamd_symcache_item_async_dec_check (cbdata->task, cbdata->item, M);
}
}
static gint
lua_load_dns (lua_State *L)
{
lua_newtable (L);
luaL_register (L, NULL, dns_f);
return 1;
}
void
luaopen_dns (lua_State *L)
{
rspamd_lua_add_preload (L, "rspamd_dns", lua_load_dns);
}
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