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/*
* LLMNR (RFC 4795) packet format definitions
*
* Copyright (C) 2015-2016 Tobias Klauser <tklauser@distanz.ch>
*
* This file is part of llmnrd.
*
* llmnrd 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, version 2 of the License.
*
* llmnrd 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 llmnrd. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef LLMNR_PACKET_H
#define LLMNR_PACKET_H
#include <stdint.h>
#include "compiler.h"
#define LLMNR_IPV4_MCAST_ADDR "224.0.0.252"
#define LLMNR_IPV6_MCAST_ADDR "ff02:0:0:0:0:0:1:3"
#define LLMNR_UDP_PORT 5355
/*
* LLMNR packet header (RFC 4795, section 2.1.1)
*/
struct llmnr_hdr {
uint16_t id;
uint16_t flags;
#define LLMNR_F_QR 0x8000
#define LLMNR_F_OPCODE 0x7800
#define LLMNR_F_C 0x0400
#define LLMNR_F_TC 0x0200
#define LLMNR_F_T 0x0100
#define LLMNR_F_RCODE 0x000f
uint16_t qdcount;
uint16_t ancount;
uint16_t nscount;
uint16_t arcount;
} __packed;
/* Maximum label length according to RFC 1035 */
#define LLMNR_LABEL_MAX_SIZE 63
/* TYPE values according to RFC 1035, section 3.2.2 */
#define LLMNR_TYPE_A 1
#define LLMNR_TYPE_NS 2
#define LLMNR_TYPE_CNAME 5
#define LLMNR_TYPE_SOA 6
#define LLMNR_TYPE_PTR 12
#define LLMNR_TYPE_HINFO 13
#define LLMNR_TYPE_MINFO 14
#define LLMNR_TYPE_MX 15
#define LLMNR_TYPE_TXT 16
#define LLMNR_TYPE_AAAA 28 /* RFC 3596 */
/* QTYPE values according to RFC 1035, section 3.2.3 */
#define LLMNR_QTYPE_A LLMNR_TYPE_A
#define LLMNR_QTYPE_AAAA LLMNR_TYPE_AAAA
#define LLMNR_QTYPE_ANY 255
/* CLASS values */
#define LLMNR_CLASS_IN 1
/* QCLASS values */
#define LLMNR_QCLASS_IN LLMNR_CLASS_IN
/* Default RR TTL in seconds (RFC 4795, section 2.8) */
#define LLMNR_TTL_DEFAULT 30
#endif /* LLMNR_PACKET_H */
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