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/*-
* Copyright 2016 Vsevolod Stakhov
*
* 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 "config.h"
#include "dns.h"
#include "rspamd.h"
#include "utlist.h"
#include "uthash.h"
#include "rdns_event.h"
struct rspamd_dns_request_ud {
struct rspamd_async_session *session;
dns_callback_type cb;
gpointer ud;
rspamd_mempool_t *pool;
struct rdns_request *req;
};
static void
rspamd_dns_fin_cb (gpointer arg)
{
struct rspamd_dns_request_ud *reqdata = (struct rspamd_dns_request_ud *)arg;
rdns_request_release (reqdata->req);
if (reqdata->pool == NULL) {
g_slice_free1 (sizeof (struct rspamd_dns_request_ud), reqdata);
}
}
static void
rspamd_dns_callback (struct rdns_reply *reply, gpointer ud)
{
struct rspamd_dns_request_ud *reqdata = ud;
reqdata->cb (reply, reqdata->ud);
if (reqdata->session) {
/*
* Ref event to avoid double unref by
* event removing
*/
rdns_request_retain (reply->request);
rspamd_session_remove_event (reqdata->session, rspamd_dns_fin_cb, reqdata);
}
else if (reqdata->pool == NULL) {
g_slice_free1 (sizeof (struct rspamd_dns_request_ud), reqdata);
}
}
gboolean
make_dns_request (struct rspamd_dns_resolver *resolver,
struct rspamd_async_session *session,
rspamd_mempool_t *pool,
dns_callback_type cb,
gpointer ud,
enum rdns_request_type type,
const char *name)
{
struct rdns_request *req;
struct rspamd_dns_request_ud *reqdata = NULL;
g_assert (resolver != NULL);
if (resolver->r == NULL) {
return FALSE;
}
if (pool != NULL) {
reqdata =
rspamd_mempool_alloc (pool, sizeof (struct rspamd_dns_request_ud));
}
else {
reqdata = g_slice_alloc (sizeof (struct rspamd_dns_request_ud));
}
reqdata->pool = pool;
reqdata->session = session;
reqdata->cb = cb;
reqdata->ud = ud;
req = rdns_make_request_full (resolver->r, rspamd_dns_callback, reqdata,
resolver->request_timeout, resolver->max_retransmits, 1, name,
type);
reqdata->req = req;
if (session) {
if (req != NULL) {
rspamd_session_add_event (session,
(event_finalizer_t)rspamd_dns_fin_cb,
reqdata,
g_quark_from_static_string ("dns resolver"));
}
}
if (req == NULL) {
if (pool == NULL) {
g_slice_free1 (sizeof (struct rspamd_dns_request_ud), reqdata);
}
return FALSE;
}
return TRUE;
}
gboolean make_dns_request_task (struct rspamd_task *task,
dns_callback_type cb,
gpointer ud,
enum rdns_request_type type,
const char *name)
{
gboolean ret;
if (task->dns_requests >= task->cfg->dns_max_requests) {
return FALSE;
}
ret = make_dns_request (task->resolver, task->s, task->task_pool, cb, ud,
type, name);
if (ret) {
task->dns_requests ++;
if (task->dns_requests >= task->cfg->dns_max_requests) {
msg_info_task ("<%s> stop resolving on reaching %ud requests",
task->message_id, task->dns_requests);
}
}
return ret;
}
static void rspamd_rnds_log_bridge (
void *log_data,
enum rdns_log_level level,
const char *function,
const char *format,
va_list args)
{
rspamd_logger_t *logger = log_data;
rspamd_common_logv (logger, (GLogLevelFlags)level, "rdns", NULL,
function, format, args);
}
struct rspamd_dns_resolver *
dns_resolver_init (rspamd_logger_t *logger,
struct event_base *ev_base,
struct rspamd_config *cfg)
{
GList *cur;
struct rspamd_dns_resolver *new;
gchar *begin, *p, *err;
gint priority;
new = g_slice_alloc0 (sizeof (struct rspamd_dns_resolver));
new->ev_base = ev_base;
if (cfg != NULL) {
new->request_timeout = cfg->dns_timeout;
new->max_retransmits = cfg->dns_retransmits;
}
else {
new->request_timeout = 1;
new->max_retransmits = 2;
}
new->r = rdns_resolver_new ();
rdns_bind_libevent (new->r, new->ev_base);
if (cfg != NULL) {
rdns_resolver_set_log_level (new->r, cfg->log_level);
}
rdns_resolver_set_logger (new->r, rspamd_rnds_log_bridge, logger);
if (cfg == NULL || cfg->nameservers == NULL) {
/* Parse resolv.conf */
if (!rdns_resolver_parse_resolv_conf (new->r, "/etc/resolv.conf")) {
msg_err_config (
"cannot parse resolv.conf and no nameservers defined, so no ways to resolve addresses");
rdns_resolver_release (new->r);
new->r = NULL;
return new;
}
}
else {
cur = cfg->nameservers;
while (cur) {
begin = cur->data;
p = strchr (begin, ':');
if (p != NULL) {
*p = '\0';
p++;
priority = strtoul (p, &err, 10);
if (err != NULL && *err != '\0') {
msg_info_config (
"bad character '%xc', must be 'm' or 's' or a numeric priority",
*err);
}
}
else {
priority = 0;
}
if (!rdns_resolver_add_server (new->r, begin, 53, priority,
cfg->dns_io_per_server)) {
msg_warn_config ("cannot parse ip address of nameserver: %s", begin);
cur = g_list_next (cur);
continue;
}
cur = g_list_next (cur);
}
}
rdns_resolver_init (new->r);
return new;
}
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