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/*
This file is part of GNUnet
(C) 2010, 2011, 2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file dns/dnsparser.h
* @brief helper library to parse DNS packets.
* @author Philipp Toelke
* @author Christian Grothoff
* @author Martin Schanzenbach
*/
GNUNET_NETWORK_STRUCT_BEGIN
/* FIXME: replace this one with the one from tcpip_tun.h!? */
/**
* Head of a any DNS message.
*/
struct GNUNET_TUN_DnsHeader
{
/**
* Request/response ID. (NBO)
*/
uint16_t id GNUNET_PACKED;
/**
* Flags for the operation.
*/
struct GNUNET_DNSPARSER_Flags flags;
/**
* number of questions (NBO)
*/
uint16_t query_count GNUNET_PACKED;
/**
* number of answers (NBO)
*/
uint16_t answer_rcount GNUNET_PACKED;
/**
* number of authority-records (NBO)
*/
uint16_t authority_rcount GNUNET_PACKED;
/**
* number of additional records (NBO)
*/
uint16_t additional_rcount GNUNET_PACKED;
};
/**
* DNS query prefix.
*/
struct query_line
{
/**
* Desired type (GNUNET_DNSPARSER_TYPE_XXX). (NBO)
*/
uint16_t type GNUNET_PACKED;
/**
* Desired class (usually GNUNET_DNSPARSER_CLASS_INTERNET). (NBO)
*/
uint16_t class GNUNET_PACKED;
};
/**
* General DNS record prefix.
*/
struct record_line
{
/**
* Record type (GNUNET_DNSPARSER_TYPE_XXX). (NBO)
*/
uint16_t type GNUNET_PACKED;
/**
* Record class (usually GNUNET_DNSPARSER_CLASS_INTERNET). (NBO)
*/
uint16_t class GNUNET_PACKED;
/**
* Expiration for the record (in seconds). (NBO)
*/
uint32_t ttl GNUNET_PACKED;
/**
* Number of bytes of data that follow. (NBO)
*/
uint16_t data_len GNUNET_PACKED;
};
/**
* Payload of DNS SOA record (header).
*/
struct soa_data
{
/**
* The version number of the original copy of the zone. (NBO)
*/
uint32_t serial GNUNET_PACKED;
/**
* Time interval before the zone should be refreshed. (NBO)
*/
uint32_t refresh GNUNET_PACKED;
/**
* Time interval that should elapse before a failed refresh should
* be retried. (NBO)
*/
uint32_t retry GNUNET_PACKED;
/**
* Time value that specifies the upper limit on the time interval
* that can elapse before the zone is no longer authoritative. (NBO)
*/
uint32_t expire GNUNET_PACKED;
/**
* The bit minimum TTL field that should be exported with any RR
* from this zone. (NBO)
*/
uint32_t minimum GNUNET_PACKED;
};
/**
* Payload of DNS SRV record (header).
*/
struct srv_data
{
/**
* Preference for this entry (lower value is higher preference). Clients
* will contact hosts from the lowest-priority group first and fall back
* to higher priorities if the low-priority entries are unavailable. (NBO)
*/
uint16_t prio GNUNET_PACKED;
/**
* Relative weight for records with the same priority. Clients will use
* the hosts of the same (lowest) priority with a probability proportional
* to the weight given. (NBO)
*/
uint16_t weight GNUNET_PACKED;
/**
* TCP or UDP port of the service. (NBO)
*/
uint16_t port GNUNET_PACKED;
/* followed by 'target' name */
};
/**
* Payload of GNS VPN record
*/
struct vpn_data
{
/**
* The peer to contact
*/
struct GNUNET_HashCode peer;
/**
* The protocol to use
*/
uint16_t proto GNUNET_PACKED;
/* followed by the servicename / identifier / password (0-terminated) */
};
GNUNET_NETWORK_STRUCT_END
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