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