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/*
* Copyright (c) 2013, Vsevolod Stakhov
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef RSPAMD_DNS_H
#define RSPAMD_DNS_H
#include "config.h"
#include "mem_pool.h"
#include "events.h"
#include "upstream.h"
struct rspamd_dns_reply;
struct config_file;
typedef void (*dns_callback_type) (struct rspamd_dns_reply *reply, gpointer arg);
enum rspamd_request_type {
DNS_REQUEST_A = 0,
DNS_REQUEST_PTR,
DNS_REQUEST_MX,
DNS_REQUEST_TXT,
DNS_REQUEST_SRV,
DNS_REQUEST_SPF,
DNS_REQUEST_AAA
};
struct rspamd_dns_request {
memory_pool_t *pool; /**< pool associated with request */
struct rspamd_dns_resolver *resolver;
struct rspamd_dns_io_channel *io;
dns_callback_type func;
gpointer arg;
struct event timer_event;
struct event io_event;
struct timeval tv;
guint retransmits;
guint16 id;
struct rspamd_async_session *session;
struct rspamd_dns_reply *reply;
guint8 *packet;
const gchar *requested_name;
off_t pos;
guint packet_len;
gint sock;
enum rspamd_request_type type;
time_t time;
struct rspamd_dns_request *next;
};
union rspamd_reply_element_un {
struct {
struct in_addr addr;
guint16 addrcount;
} a;
#ifdef HAVE_INET_PTON
struct {
struct in6_addr addr;
} aaa;
#endif
struct {
gchar *name;
} ptr;
struct {
gchar *name;
guint16 priority;
} mx;
struct {
gchar *data;
} txt;
struct {
guint16 priority;
guint16 weight;
guint16 port;
gchar *target;
} srv;
};
struct rspamd_reply_entry {
union rspamd_reply_element_un content;
guint16 type;
guint16 ttl;
struct rspamd_reply_entry *prev, *next;
};
enum dns_rcode {
DNS_RC_NOERROR = 0,
DNS_RC_FORMERR = 1,
DNS_RC_SERVFAIL = 2,
DNS_RC_NXDOMAIN = 3,
DNS_RC_NOTIMP = 4,
DNS_RC_REFUSED = 5,
DNS_RC_YXDOMAIN = 6,
DNS_RC_YXRRSET = 7,
DNS_RC_NXRRSET = 8,
DNS_RC_NOTAUTH = 9,
DNS_RC_NOTZONE = 10,
};
struct rspamd_dns_reply {
struct rspamd_dns_request *request;
enum dns_rcode code;
struct rspamd_reply_entry *entries;
};
/* Rspamd DNS API */
/**
* Init DNS resolver, params are obtained from a config file or system file /etc/resolv.conf
*/
struct rspamd_dns_resolver *dns_resolver_init (struct event_base *ev_base, struct config_file *cfg);
/**
* Make a DNS request
* @param resolver resolver object
* @param session async session to register event
* @param pool memory pool for storage
* @param cb callback to call on resolve completing
* @param ud user data for callback
* @param type request type
* @param ... string or ip address based on a request type
* @return TRUE if request was sent.
*/
gboolean make_dns_request (struct rspamd_dns_resolver *resolver,
struct rspamd_async_session *session, memory_pool_t *pool, dns_callback_type cb,
gpointer ud, enum rspamd_request_type type, ...);
/**
* Get textual presentation of DNS error code
*/
const gchar *dns_strerror (enum dns_rcode rcode);
/**
* Get textual presentation of DNS request type
*/
const gchar *dns_strtype (enum rspamd_request_type type);
#endif
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