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Diffstat (limited to 'llmnr-packet.h')
| -rw-r--r-- | llmnr-packet.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/llmnr-packet.h b/llmnr-packet.h new file mode 100644 index 0000000..8b26bb9 --- /dev/null +++ b/llmnr-packet.h @@ -0,0 +1,80 @@ +/* + * LLMNR (RFC 4705) packet format definitions + * + * Copyright (C) 2015 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 RFC1035, 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 RFC1035, 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 */ |