1 /** 2 * @file 3 * DNS - host name to IP address resolver. 4 */ 5 6 /* 7 * Port to lwIP from uIP 8 * by Jim Pettinato April 2007 9 * 10 * security fixes and more by Simon Goldschmidt 11 * 12 * uIP version Copyright (c) 2002-2003, Adam Dunkels. 13 * All rights reserved. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. The name of the author may not be used to endorse or promote 24 * products derived from this software without specific prior 25 * written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 28 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 29 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 31 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 33 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 35 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 36 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 37 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 #ifndef LWIP_HDR_PROT_DNS_H 41 #define LWIP_HDR_PROT_DNS_H 42 43 #include "lwip/arch.h" 44 45 #ifdef __cplusplus 46 extern "C" { 47 #endif 48 49 /** DNS server port address */ 50 #ifndef DNS_SERVER_PORT 51 #define DNS_SERVER_PORT 53 52 #endif 53 54 /* DNS field TYPE used for "Resource Records" */ 55 #define DNS_RRTYPE_A 1 /* a host address */ 56 #define DNS_RRTYPE_NS 2 /* an authoritative name server */ 57 #define DNS_RRTYPE_MD 3 /* a mail destination (Obsolete - use MX) */ 58 #define DNS_RRTYPE_MF 4 /* a mail forwarder (Obsolete - use MX) */ 59 #define DNS_RRTYPE_CNAME 5 /* the canonical name for an alias */ 60 #define DNS_RRTYPE_SOA 6 /* marks the start of a zone of authority */ 61 #define DNS_RRTYPE_MB 7 /* a mailbox domain name (EXPERIMENTAL) */ 62 #define DNS_RRTYPE_MG 8 /* a mail group member (EXPERIMENTAL) */ 63 #define DNS_RRTYPE_MR 9 /* a mail rename domain name (EXPERIMENTAL) */ 64 #define DNS_RRTYPE_NULL 10 /* a null RR (EXPERIMENTAL) */ 65 #define DNS_RRTYPE_WKS 11 /* a well known service description */ 66 #define DNS_RRTYPE_PTR 12 /* a domain name pointer */ 67 #define DNS_RRTYPE_HINFO 13 /* host information */ 68 #define DNS_RRTYPE_MINFO 14 /* mailbox or mail list information */ 69 #define DNS_RRTYPE_MX 15 /* mail exchange */ 70 #define DNS_RRTYPE_TXT 16 /* text strings */ 71 #define DNS_RRTYPE_AAAA 28 /* IPv6 address */ 72 #define DNS_RRTYPE_SRV 33 /* service location */ 73 #define DNS_RRTYPE_ANY 255 /* any type */ 74 75 /* DNS field CLASS used for "Resource Records" */ 76 #define DNS_RRCLASS_IN 1 /* the Internet */ 77 #define DNS_RRCLASS_CS 2 /* the CSNET class (Obsolete - used only for examples in some obsolete RFCs) */ 78 #define DNS_RRCLASS_CH 3 /* the CHAOS class */ 79 #define DNS_RRCLASS_HS 4 /* Hesiod [Dyer 87] */ 80 #define DNS_RRCLASS_ANY 255 /* any class */ 81 #define DNS_RRCLASS_FLUSH 0x800 /* Flush bit */ 82 83 /* DNS protocol flags */ 84 #define DNS_FLAG1_RESPONSE 0x80 85 #define DNS_FLAG1_OPCODE_STATUS 0x10 86 #define DNS_FLAG1_OPCODE_INVERSE 0x08 87 #define DNS_FLAG1_OPCODE_STANDARD 0x00 88 #define DNS_FLAG1_AUTHORATIVE 0x04 89 #define DNS_FLAG1_TRUNC 0x02 90 #define DNS_FLAG1_RD 0x01 91 #define DNS_FLAG2_RA 0x80 92 #define DNS_FLAG2_ERR_MASK 0x0f 93 #define DNS_FLAG2_ERR_NONE 0x00 94 #define DNS_FLAG2_ERR_NAME 0x03 95 96 #define DNS_HDR_GET_OPCODE(hdr) ((((hdr)->flags1) >> 3) & 0xF) 97 98 #ifdef PACK_STRUCT_USE_INCLUDES 99 # include "arch/bpstruct.h" 100 #endif 101 PACK_STRUCT_BEGIN 102 /** DNS message header */ 103 struct dns_hdr { 104 PACK_STRUCT_FIELD(u16_t id); 105 PACK_STRUCT_FLD_8(u8_t flags1); 106 PACK_STRUCT_FLD_8(u8_t flags2); 107 PACK_STRUCT_FIELD(u16_t numquestions); 108 PACK_STRUCT_FIELD(u16_t numanswers); 109 PACK_STRUCT_FIELD(u16_t numauthrr); 110 PACK_STRUCT_FIELD(u16_t numextrarr); 111 } PACK_STRUCT_STRUCT; 112 PACK_STRUCT_END 113 #ifdef PACK_STRUCT_USE_INCLUDES 114 # include "arch/epstruct.h" 115 #endif 116 #define SIZEOF_DNS_HDR 12 117 118 119 /* Multicast DNS definitions */ 120 121 /** UDP port for multicast DNS queries */ 122 #ifndef DNS_MQUERY_PORT 123 #define DNS_MQUERY_PORT 5353 124 #endif 125 126 /* IPv4 group for multicast DNS queries: 224.0.0.251 */ 127 #ifndef DNS_MQUERY_IPV4_GROUP_INIT 128 #define DNS_MQUERY_IPV4_GROUP_INIT IPADDR4_INIT_BYTES(224,0,0,251) 129 #endif 130 131 /* IPv6 group for multicast DNS queries: FF02::FB */ 132 #ifndef DNS_MQUERY_IPV6_GROUP_INIT 133 #define DNS_MQUERY_IPV6_GROUP_INIT IPADDR6_INIT_HOST(0xFF020000,0,0,0xFB) 134 #endif 135 136 #ifdef __cplusplus 137 } 138 #endif 139 140 #endif /* LWIP_HDR_PROT_DNS_H */ 141