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141 lines
5.2 KiB
C
141 lines
5.2 KiB
C
/**
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* @file
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* DNS - host name to IP address resolver.
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*/
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/*
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* Port to lwIP from uIP
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* by Jim Pettinato April 2007
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*
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* security fixes and more by Simon Goldschmidt
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*
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* uIP version Copyright (c) 2002-2003, Adam Dunkels.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef LWIP_HDR_PROT_DNS_H
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#define LWIP_HDR_PROT_DNS_H
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#include "lwip/arch.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** DNS server port address */
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#ifndef DNS_SERVER_PORT
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#define DNS_SERVER_PORT 53
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#endif
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/* DNS field TYPE used for "Resource Records" */
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#define DNS_RRTYPE_A 1 /* a host address */
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#define DNS_RRTYPE_NS 2 /* an authoritative name server */
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#define DNS_RRTYPE_MD 3 /* a mail destination (Obsolete - use MX) */
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#define DNS_RRTYPE_MF 4 /* a mail forwarder (Obsolete - use MX) */
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#define DNS_RRTYPE_CNAME 5 /* the canonical name for an alias */
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#define DNS_RRTYPE_SOA 6 /* marks the start of a zone of authority */
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#define DNS_RRTYPE_MB 7 /* a mailbox domain name (EXPERIMENTAL) */
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#define DNS_RRTYPE_MG 8 /* a mail group member (EXPERIMENTAL) */
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#define DNS_RRTYPE_MR 9 /* a mail rename domain name (EXPERIMENTAL) */
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#define DNS_RRTYPE_NULL 10 /* a null RR (EXPERIMENTAL) */
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#define DNS_RRTYPE_WKS 11 /* a well known service description */
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#define DNS_RRTYPE_PTR 12 /* a domain name pointer */
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#define DNS_RRTYPE_HINFO 13 /* host information */
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#define DNS_RRTYPE_MINFO 14 /* mailbox or mail list information */
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#define DNS_RRTYPE_MX 15 /* mail exchange */
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#define DNS_RRTYPE_TXT 16 /* text strings */
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#define DNS_RRTYPE_AAAA 28 /* IPv6 address */
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#define DNS_RRTYPE_SRV 33 /* service location */
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#define DNS_RRTYPE_ANY 255 /* any type */
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/* DNS field CLASS used for "Resource Records" */
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#define DNS_RRCLASS_IN 1 /* the Internet */
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#define DNS_RRCLASS_CS 2 /* the CSNET class (Obsolete - used only for examples in some obsolete RFCs) */
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#define DNS_RRCLASS_CH 3 /* the CHAOS class */
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#define DNS_RRCLASS_HS 4 /* Hesiod [Dyer 87] */
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#define DNS_RRCLASS_ANY 255 /* any class */
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#define DNS_RRCLASS_FLUSH 0x800 /* Flush bit */
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/* DNS protocol flags */
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#define DNS_FLAG1_RESPONSE 0x80
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#define DNS_FLAG1_OPCODE_STATUS 0x10
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#define DNS_FLAG1_OPCODE_INVERSE 0x08
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#define DNS_FLAG1_OPCODE_STANDARD 0x00
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#define DNS_FLAG1_AUTHORATIVE 0x04
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#define DNS_FLAG1_TRUNC 0x02
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#define DNS_FLAG1_RD 0x01
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#define DNS_FLAG2_RA 0x80
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#define DNS_FLAG2_ERR_MASK 0x0f
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#define DNS_FLAG2_ERR_NONE 0x00
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#define DNS_FLAG2_ERR_NAME 0x03
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#define DNS_HDR_GET_OPCODE(hdr) ((((hdr)->flags1) >> 3) & 0xF)
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/bpstruct.h"
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#endif
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PACK_STRUCT_BEGIN
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/** DNS message header */
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struct dns_hdr {
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PACK_STRUCT_FIELD(u16_t id);
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PACK_STRUCT_FLD_8(u8_t flags1);
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PACK_STRUCT_FLD_8(u8_t flags2);
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PACK_STRUCT_FIELD(u16_t numquestions);
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PACK_STRUCT_FIELD(u16_t numanswers);
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PACK_STRUCT_FIELD(u16_t numauthrr);
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PACK_STRUCT_FIELD(u16_t numextrarr);
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} PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/epstruct.h"
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#endif
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#define SIZEOF_DNS_HDR 12
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/* Multicast DNS definitions */
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/** UDP port for multicast DNS queries */
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#ifndef DNS_MQUERY_PORT
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#define DNS_MQUERY_PORT 5353
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#endif
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/* IPv4 group for multicast DNS queries: 224.0.0.251 */
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#ifndef DNS_MQUERY_IPV4_GROUP_INIT
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#define DNS_MQUERY_IPV4_GROUP_INIT IPADDR4_INIT_BYTES(224,0,0,251)
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#endif
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/* IPv6 group for multicast DNS queries: FF02::FB */
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#ifndef DNS_MQUERY_IPV6_GROUP_INIT
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#define DNS_MQUERY_IPV6_GROUP_INIT IPADDR6_INIT_HOST(0xFF020000,0,0,0xFB)
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* LWIP_HDR_PROT_DNS_H */
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