BadVPN – Blame information for rev 1
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1 | office | 1 | /** |
2 | * @file |
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3 | * DNS - host name to IP address resolver. |
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4 | */ |
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5 | |||
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 | |||
40 | #ifndef LWIP_HDR_PROT_DNS_H |
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41 | #define LWIP_HDR_PROT_DNS_H |
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42 | |||
43 | #include "lwip/arch.h" |
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44 | |||
45 | #ifdef __cplusplus |
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46 | extern "C" { |
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47 | #endif |
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48 | |||
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 | |||
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 | |||
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 | |||
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 | |||
96 | #define DNS_HDR_GET_OPCODE(hdr) ((((hdr)->flags1) >> 3) & 0xF) |
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97 | |||
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 | |||
118 | |||
119 | /* Multicast DNS definitions */ |
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120 | |||
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 | |||
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 | |||
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 | |||
136 | #ifdef __cplusplus |
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137 | } |
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138 | #endif |
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139 | |||
140 | #endif /* LWIP_HDR_PROT_DNS_H */ |