| /** |
| * @file |
| * DNS - host name to IP address resolver. |
| */ |
| |
| /* |
| * Port to lwIP from uIP |
| * by Jim Pettinato April 2007 |
| * |
| * security fixes and more by Simon Goldschmidt |
| * |
| * uIP version Copyright (c) 2002-2003, Adam Dunkels. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * 3. The name of the author may not be used to endorse or promote |
| * products derived from this software without specific prior |
| * written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE 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 THE 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 LWIP_HDR_PROT_DNS_H |
| #define LWIP_HDR_PROT_DNS_H |
| |
| #include "lwip/arch.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** DNS server port address */ |
| #ifndef DNS_SERVER_PORT |
| #define DNS_SERVER_PORT 53 |
| #endif |
| |
| /* DNS field TYPE used for "Resource Records" */ |
| #define DNS_RRTYPE_A 1 /* a host address */ |
| #define DNS_RRTYPE_NS 2 /* an authoritative name server */ |
| #define DNS_RRTYPE_MD 3 /* a mail destination (Obsolete - use MX) */ |
| #define DNS_RRTYPE_MF 4 /* a mail forwarder (Obsolete - use MX) */ |
| #define DNS_RRTYPE_CNAME 5 /* the canonical name for an alias */ |
| #define DNS_RRTYPE_SOA 6 /* marks the start of a zone of authority */ |
| #define DNS_RRTYPE_MB 7 /* a mailbox domain name (EXPERIMENTAL) */ |
| #define DNS_RRTYPE_MG 8 /* a mail group member (EXPERIMENTAL) */ |
| #define DNS_RRTYPE_MR 9 /* a mail rename domain name (EXPERIMENTAL) */ |
| #define DNS_RRTYPE_NULL 10 /* a null RR (EXPERIMENTAL) */ |
| #define DNS_RRTYPE_WKS 11 /* a well known service description */ |
| #define DNS_RRTYPE_PTR 12 /* a domain name pointer */ |
| #define DNS_RRTYPE_HINFO 13 /* host information */ |
| #define DNS_RRTYPE_MINFO 14 /* mailbox or mail list information */ |
| #define DNS_RRTYPE_MX 15 /* mail exchange */ |
| #define DNS_RRTYPE_TXT 16 /* text strings */ |
| #define DNS_RRTYPE_AAAA 28 /* IPv6 address */ |
| #define DNS_RRTYPE_SRV 33 /* service location */ |
| #define DNS_RRTYPE_ANY 255 /* any type */ |
| |
| /* DNS field CLASS used for "Resource Records" */ |
| #define DNS_RRCLASS_IN 1 /* the Internet */ |
| #define DNS_RRCLASS_CS 2 /* the CSNET class (Obsolete - used only for examples in some obsolete RFCs) */ |
| #define DNS_RRCLASS_CH 3 /* the CHAOS class */ |
| #define DNS_RRCLASS_HS 4 /* Hesiod [Dyer 87] */ |
| #define DNS_RRCLASS_ANY 255 /* any class */ |
| #define DNS_RRCLASS_FLUSH 0x800 /* Flush bit */ |
| |
| /* DNS protocol flags */ |
| #define DNS_FLAG1_RESPONSE 0x80 |
| #define DNS_FLAG1_OPCODE_STATUS 0x10 |
| #define DNS_FLAG1_OPCODE_INVERSE 0x08 |
| #define DNS_FLAG1_OPCODE_STANDARD 0x00 |
| #define DNS_FLAG1_AUTHORATIVE 0x04 |
| #define DNS_FLAG1_TRUNC 0x02 |
| #define DNS_FLAG1_RD 0x01 |
| #define DNS_FLAG2_RA 0x80 |
| #define DNS_FLAG2_ERR_MASK 0x0f |
| #define DNS_FLAG2_ERR_NONE 0x00 |
| #define DNS_FLAG2_ERR_NAME 0x03 |
| |
| #define DNS_HDR_GET_OPCODE(hdr) ((((hdr)->flags1) >> 3) & 0xF) |
| |
| #ifdef PACK_STRUCT_USE_INCLUDES |
| # include "arch/bpstruct.h" |
| #endif |
| PACK_STRUCT_BEGIN |
| /** DNS message header */ |
| struct dns_hdr { |
| PACK_STRUCT_FIELD(u16_t id); |
| PACK_STRUCT_FLD_8(u8_t flags1); |
| PACK_STRUCT_FLD_8(u8_t flags2); |
| PACK_STRUCT_FIELD(u16_t numquestions); |
| PACK_STRUCT_FIELD(u16_t numanswers); |
| PACK_STRUCT_FIELD(u16_t numauthrr); |
| PACK_STRUCT_FIELD(u16_t numextrarr); |
| } PACK_STRUCT_STRUCT; |
| PACK_STRUCT_END |
| #ifdef PACK_STRUCT_USE_INCLUDES |
| # include "arch/epstruct.h" |
| #endif |
| #define SIZEOF_DNS_HDR 12 |
| |
| |
| /* Multicast DNS definitions */ |
| |
| /** UDP port for multicast DNS queries */ |
| #ifndef DNS_MQUERY_PORT |
| #define DNS_MQUERY_PORT 5353 |
| #endif |
| |
| /* IPv4 group for multicast DNS queries: 224.0.0.251 */ |
| #ifndef DNS_MQUERY_IPV4_GROUP_INIT |
| #define DNS_MQUERY_IPV4_GROUP_INIT IPADDR4_INIT_BYTES(224,0,0,251) |
| #endif |
| |
| /* IPv6 group for multicast DNS queries: FF02::FB */ |
| #ifndef DNS_MQUERY_IPV6_GROUP_INIT |
| #define DNS_MQUERY_IPV6_GROUP_INIT IPADDR6_INIT_HOST(0xFF020000,0,0,0xFB) |
| #endif |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* LWIP_HDR_PROT_DNS_H */ |
