1 | /*
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2 | * TINET (TCP/IP Protocol Stack)
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3 | *
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4 | * Copyright (C) 2001-2017 by Dep. of Computer Science and Engineering
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5 | * Tomakomai National College of Technology, JAPAN
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6 | *
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7 | * ä¸è¨èä½æ¨©è
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8 | ã¯ï¼ä»¥ä¸ã® (1)ï½(4) ã®æ¡ä»¶ãï¼Free Software Foundation
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9 | * ã«ãã£ã¦å
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10 | ¬è¡¨ããã¦ãã GNU General Public License ã® Version 2 ã«è¨
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11 | * è¿°ããã¦ããæ¡ä»¶ãæºããå ´åã«éãï¼æ¬ã½ããã¦ã§ã¢ï¼æ¬ã½ããã¦ã§ã¢
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12 | * ãæ¹å¤ãããã®ãå«ãï¼ä»¥ä¸åãï¼ã使ç¨ã»è¤è£½ã»æ¹å¤ã»åé
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13 | å¸ï¼ä»¥ä¸ï¼
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14 | * å©ç¨ã¨å¼ã¶ï¼ãããã¨ãç¡åã§è¨±è«¾ããï¼
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15 | * (1) æ¬ã½ããã¦ã§ã¢ãã½ã¼ã¹ã³ã¼ãã®å½¢ã§å©ç¨ããå ´åã«ã¯ï¼ä¸è¨ã®èä½
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16 | * 権表示ï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨ã®ç¡ä¿è¨¼è¦å®ãï¼ãã®ã¾ã¾ã®å½¢ã§ã½ã¼
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17 | * ã¹ã³ã¼ãä¸ã«å«ã¾ãã¦ãããã¨ï¼
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18 | * (2) æ¬ã½ããã¦ã§ã¢ãï¼ã©ã¤ãã©ãªå½¢å¼ãªã©ï¼ä»ã®ã½ããã¦ã§ã¢éçºã«ä½¿
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19 | * ç¨ã§ããå½¢ã§åé
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20 | å¸ããå ´åã«ã¯ï¼åé
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21 | å¸ã«ä¼´ãããã¥ã¡ã³ãï¼å©ç¨
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22 | * è
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23 | ããã¥ã¢ã«ãªã©ï¼ã«ï¼ä¸è¨ã®èä½æ¨©è¡¨ç¤ºï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨
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24 | * ã®ç¡ä¿è¨¼è¦å®ãæ²è¼ãããã¨ï¼
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25 | * (3) æ¬ã½ããã¦ã§ã¢ãï¼æ©å¨ã«çµã¿è¾¼ããªã©ï¼ä»ã®ã½ããã¦ã§ã¢éçºã«ä½¿
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26 | * ç¨ã§ããªãå½¢ã§åé
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27 | å¸ããå ´åã«ã¯ï¼æ¬¡ã®ããããã®æ¡ä»¶ãæºããã
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28 | * ã¨ï¼
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29 | * (a) åé
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30 | å¸ã«ä¼´ãããã¥ã¡ã³ãï¼å©ç¨è
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31 | ããã¥ã¢ã«ãªã©ï¼ã«ï¼ä¸è¨ã®è
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32 | * ä½æ¨©è¡¨ç¤ºï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨ã®ç¡ä¿è¨¼è¦å®ãæ²è¼ãããã¨ï¼
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33 | * (b) åé
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34 | å¸ã®å½¢æ
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35 | ãï¼å¥ã«å®ããæ¹æ³ã«ãã£ã¦ï¼TOPPERSããã¸ã§ã¯ãã«
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36 | * å ±åãããã¨ï¼
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37 | * (4) æ¬ã½ããã¦ã§ã¢ã®å©ç¨ã«ããç´æ¥çã¾ãã¯éæ¥çã«çãããããªãæ
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38 | * 害ãããï¼ä¸è¨èä½æ¨©è
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39 | ããã³TOPPERSããã¸ã§ã¯ããå
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40 | 責ãããã¨ï¼
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41 | *
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42 | * æ¬ã½ããã¦ã§ã¢ã¯ï¼ç¡ä¿è¨¼ã§æä¾ããã¦ãããã®ã§ããï¼ä¸è¨èä½æ¨©è
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43 | ã
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44 | * ãã³TOPPERSããã¸ã§ã¯ãã¯ï¼æ¬ã½ããã¦ã§ã¢ã«é¢ãã¦ï¼ãã®é©ç¨å¯è½æ§ã
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45 | * å«ãã¦ï¼ãããªãä¿è¨¼ãè¡ããªãï¼ã¾ãï¼æ¬ã½ããã¦ã§ã¢ã®å©ç¨ã«ããç´
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46 | * æ¥çã¾ãã¯éæ¥çã«çãããããªãæ害ã«é¢ãã¦ãï¼ãã®è²¬ä»»ãè² ããªãï¼
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47 | *
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48 | * @(#) $Id$
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49 | */
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50 |
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51 | #ifndef DNS_H
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52 | #define DNS_H
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53 |
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54 | /*
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55 | * DNS ã¡ãã»ã¼ã¸ã«é¢ããå®ç¾©
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56 | *
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57 | * RFC1034ãRFC1035ãRFC1886ãRFC2136ã
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58 | * RFC2671ãRFC2845ãRFC2930ãRFC3596
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59 | *
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60 | * DNS ã¡ãã»ã¼ã¸
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61 | *
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62 | * +---------------------+
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63 | * | Header |
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64 | * +---------------------+
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65 | * | Question | Question section å½¢å¼
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66 | * +---------------------+
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67 | * | Answer | RR (Resouce Record) å½¢å¼
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68 | * +---------------------+
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69 | * | Authority | RR (Resouce Record) å½¢å¼
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70 | * +---------------------+
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71 | * | Additional | RR (Resouce Record) å½¢å¼
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72 | * +---------------------+
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73 | *
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74 | * DNS ããã
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75 | *
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76 | * 0 7 8 15
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77 | * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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78 | * | ID |
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79 | * +--+-----------+--+--+--+--+--------+-----------+
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80 | * |QR| Opcode |AA|TC|RD|RA| Z | RCODE |
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81 | * +--+--------+--+--+--+--+--+--------+-----------+
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82 | * | QDCOUNT |
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83 | * +-----------------------------------------------+
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84 | * | ANCOUNT |
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85 | * +-----------------------------------------------+
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86 | * | NSCOUNT |
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87 | * +-----------------------------------------------+
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88 | * | ARCOUNT |
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89 | * +-----------------------------------------------+
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90 | */
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91 |
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92 | typedef struct dns_hdr {
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93 | uint16_t id; /* ID */
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94 | uint16_t code; /* QR: 1
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95 | Opcode: 4
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96 | AA: 1
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97 | TC: 1
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98 | RD: 1
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99 | RA: 1
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100 | Z: 3
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101 | RCODE: 4
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102 | */
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103 | uint16_t qdcount; /* question section */
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104 | uint16_t ancount; /* answer section */
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105 | uint16_t nscount; /* authority section */
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106 | uint16_t arcount; /* additional section */
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107 | } T_DNS_HDR;
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108 |
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109 | /*
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110 | * code ã®å®ç¾©
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111 | */
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112 |
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113 | /* QR ã®å®ç¾© */
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114 |
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115 | #define DNS_QR_QUERY 0x0000U
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116 | #define DNS_QR_RESPONSE 0x8000U
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117 |
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118 | /* Opcode ã®å®ç¾© */
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119 |
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120 | #define DNS_OPCODE_MASK 0x7800U
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121 | #define DNS_OPCODE_FORWARD 0x0000U
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122 | #define DNS_OPCODE_REVERSE 0x0800U
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123 | #define DNS_OPCODE_STATUS 0x1000U
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124 |
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125 | /* AA ã®å®ç¾© */
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126 |
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127 | #define DNS_AUTHORITATIVE 0x0400U
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128 |
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129 | /* TC ã®å®ç¾© */
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130 |
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131 | #define DNS_TRUN_CATION 0x0200U
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132 |
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133 | /* RD ã®å®ç¾© */
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134 |
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135 | #define DNS_RECURSION_DESIRED 0x0100U
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136 |
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137 | /* RA ã®å®ç¾© */
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138 |
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139 | #define DNS_RECURSION_AVAILABLE 0x0080U
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140 |
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141 | /* RCODE ã®å®ç¾© */
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142 |
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143 | #define DNS_RCODE_MASK 0x000fU
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144 | #define DNS_RCODE_NO_ERROR 0x0000U
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145 | #define DNS_RCODE_FORMAT_ERROR 0x0001U
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146 | #define DNS_RCODE_SERVER_ERROR 0x0002U
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147 | #define DNS_RCODE_NAME_ERROR 0x0003U
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148 | #define DNS_RCODE_NOT_IMPLEMENT 0x0004U
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149 | #define DNS_RCODE_REFUSED 0x0005U
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150 |
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151 | /*
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152 | * DNS TYPE ã®å®ç¾©
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153 | */
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154 |
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155 | #define DNS_TYPE_A (uint16_t)1U
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156 | #define DNS_TYPE_NS (uint16_t)2U
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157 | #define DNS_TYPE_CNAME (uint16_t)5U
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158 | #define DNS_TYPE_SOA (uint16_t)6U
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159 | #define DNS_TYPE_PTR (uint16_t)12U
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160 | #define DNS_TYPE_AAAA (uint16_t)28U
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161 |
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162 | /*
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163 | * DNS CLASS ã®å®ç¾©
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164 | */
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165 |
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166 | #define DNS_CLASS_IN (uint16_t)1U
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167 |
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168 | /*
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169 | * RR (Resouce Record) å½¢å¼
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170 | *
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171 | * 0 7 8 15
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172 | * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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173 | * | . |
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174 | * +----------------- . -----------------+
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175 | * | NAME |
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176 | * +----------------- . -----------------+
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177 | * | . |
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178 | * +-----------------------------------------------+
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179 | * | TYPE |
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180 | * +-----------------------------------------------+
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181 | * | CLASS |
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182 | * +-----------------------------------------------+
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183 | * | TTL |
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184 | * | |
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185 | * +-----------------------------------------------+
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186 | * | RDLENGTH |
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187 | * +-----------------------------------------------+
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188 | * | . |
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189 | * +----------------- . -----------------+
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190 | * | RDATA |
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191 | * +----------------- . -----------------+
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192 | * | . |
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193 | * +-----------------------------------------------+
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194 | *
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195 | * 注æ: offset ã®åç¹ã¯ DNS message ã®å
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196 | é
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197 | */
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198 |
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199 | typedef struct dns_rr {
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200 | /* NAME */
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201 | uint16_t type; /* TYPE */
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202 | uint16_t class; /* CLASS */
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203 | uint32_t ttl; /* TTL */
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204 | uint16_t rdlength; /* RDATA length */
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205 | /* RDATA */
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206 | } T_DNS_RR;
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207 |
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208 | #define T_DNS_RR_SIZE (sizeof(uint16_t)*3+sizeof(uint32_t))
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209 |
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210 | /*
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211 | * Question section å½¢å¼
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212 | *
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213 | * 0 7 8 15
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214 | * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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215 | * | . |
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216 | * +----------------- . -----------------+
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217 | * | QNAME |
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218 | * +----------------- . -----------------+
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219 | * | . |
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220 | * +-----------------------------------------------+
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221 | * | QTYPE |
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222 | * +-----------------------------------------------+
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223 | * | QCLASS |
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224 | * +-----------------------------------------------+
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225 | */
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226 |
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227 | typedef struct dns_qd {
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228 | /* QNAME */
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229 | uint16_t type; /* TYPE */
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230 | uint16_t class; /* CLASS */
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231 | } T_DNS_QD;
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232 |
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233 | #define T_DNS_QD_SIZE (sizeof(uint16_t)*2)
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234 |
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235 | /*
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236 | * SOA RDATA å½¢å¼
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237 | *
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238 | * 0 7 8 15
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239 | * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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240 | * | . |
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241 | * +----------------- . -----------------+
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242 | * | MNAME |
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243 | * +----------------- . -----------------+
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244 | * | . |
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245 | * +-----------------------------------------------+
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246 | * | . |
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247 | * +----------------- . -----------------+
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248 | * | RNAME |
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249 | * +----------------- . -----------------+
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250 | * | . |
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251 | * +-----------------------------------------------+
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252 | * | SERIAL |
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253 | * | |
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254 | * +-----------------------------------------------+
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255 | * | REFRESH |
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256 | * | |
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257 | * +-----------------------------------------------+
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258 | * | RETRY |
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259 | * | |
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260 | * +-----------------------------------------------+
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261 | * | EXPIRE |
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262 | * | |
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263 | * +-----------------------------------------------+
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264 | * | MINIMUM |
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265 | * | |
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266 | * +-----------------------------------------------+
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267 | *
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268 | * 注æ: offset ã®åç¹ã¯ DNS message ã®å
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269 | é
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270 | */
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271 |
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272 | typedef struct dns_soa {
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273 | /* MNAME */
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274 | /* RNAME */
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275 | uint32_t serial; /* SERIAL */
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276 | uint32_t refresh; /* REFRESH */
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277 | uint32_t retry; /* RETRY */
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278 | uint32_t expire; /* EXPIRE */
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279 | uint32_t minimum; /* MINIMUM */
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280 | } T_DNS_SOA;
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281 |
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282 | #define T_DNS_SOA_SIZE (sizeof(uint32_t)*5)
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283 |
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284 | /*
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285 | * DNS ã®å®æ°ã®å®ç¾©
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286 | */
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287 |
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288 | #define DNS_LABEL_LENGTH 63
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289 | #define DNS_NAME_LENGTH 255
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290 | #define DNS_UDP_MSG_LENGTH 512
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291 |
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292 | #define DNS_MSG_COMP_MARK 0xc0
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293 |
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294 | #endif /* of #ifndef DNS_H */
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