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 | /*
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52 | * ãã¹ãåââIP ã¢ãã¬ã¹å¤æ
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53 | */
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54 |
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55 | #ifndef RESOLVER_H
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56 | #define RESOLVER_H
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57 |
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58 | #include <netapp/dns.h>
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59 |
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60 | /*
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61 | * ã³ã³ãã¤ã«æã³ã³ãã£ã®ã¥ã¬ã¼ã·ã§ã³ã®æå®
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62 | */
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63 |
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64 | /* ãã¼ãçªå· */
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65 |
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66 | #define RSLV_CFG_DNS_PORTNO 53
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67 |
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68 | /*
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69 | * ã¿ã¤ã ã¢ã¦ãå¤
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70 | */
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71 |
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72 | #define TMO_DNS_UDP_SND ULONG_C(1*1000*1000) /* [us]ãDNS ãµã¼ãã¸ã® UDP éä¿¡ã¿ã¤ã ã¢ã¦ã */
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73 | #define TMO_DNS_UDP_RCV ULONG_C(5*1000*1000) /* [us]ãDNS ãµã¼ãããã® UDP åä¿¡ã¿ã¤ã ã¢ã¦ã */
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74 | #define NUM_DNS_UDP_RETRY 1 /* ãªãã©ã¤åæ° */
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75 |
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76 | /*
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77 | * ãã¡ã¤ã³å
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78 | */
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79 |
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80 |
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81 | #if !defined(RSLV_CFG_DNS_DOMAIN_NAME_STR)
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82 | #define RSLV_CFG_DNS_DOMAIN_NAME_STR ""
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83 | #endif
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84 |
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85 | /*
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86 | * DNS ãµã¼ãã¼ã® IPã¢ãã¬ã¹
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87 | */
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88 |
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89 | #if !defined(IPV6_ADDR_DNS_INIT)
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90 | #define IPV6_ADDR_DNS_INIT IPV6_ADDR_UNSPECIFIED_INIT
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91 | #endif
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92 |
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93 | #if !defined(IPV4_ADDR_DNS)
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94 | #define IPV4_ADDR_DNS IPV4_ADDRANY
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95 | #endif
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96 |
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97 | /*
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98 | * éåä¿¡ãããã¡æ°
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99 | */
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100 |
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101 | #define NUM_MPF_RSLV_SRBUF 1
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102 |
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103 | /*
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104 | * ããã°ã©ã ã§ä½¿ç¨ããæ
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105 | å ±ã®å®ç¾©
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106 | */
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107 |
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108 | /*
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109 | * ããã°ã©ã ã§ä½¿ç¨ãã DNS ããã
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110 | *
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111 | * 注æ: ã¡ã³ãã¯ãã¹ããã¤ããªã¼ãã¼
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112 | *
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113 | * 0 7 8 15
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114 | * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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115 | * | ID |
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116 | * +--+-----------+--+--+--+--+--------+-----------+
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117 | * |QR| Opcode |AA|TC|RD|RA| Z | RCODE |
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118 | * +--+--------+--+--+--+--+--+--------+-----------+
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119 | * | QDCOUNT |
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120 | * +-----------------------------------------------+
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121 | * | ANCOUNT |
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122 | * +-----------------------------------------------+
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123 | * | NSCOUNT |
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124 | * +-----------------------------------------------+
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125 | * | ARCOUNT |
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126 | * +-----------------------------------------------+
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127 | */
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128 |
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129 | typedef struct rslv_dns_hdr {
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130 | uint16_t id; /* ID */
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131 | uint16_t code; /* QR: 1
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132 | Opcode: 4
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133 | AA: 1
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134 | TC: 1
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135 | RD: 1
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136 | RA: 1
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137 | Z: 3
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138 | RCODE: 4
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139 | */
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140 | uint16_t qdcount; /* question section */
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141 | uint16_t ancount; /* answer section */
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142 | uint16_t nscount; /* authority section */
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143 | uint16_t arcount; /* additional section */
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144 | } __attribute__((packed))T_RSLV_DNS_HDR;
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145 |
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146 | /*
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147 | * DNS message data
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148 | *
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149 | * 注æ: ã¡ã³ãã¯ãã¹ããã¤ããªã¼ãã¼
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150 | */
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151 |
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152 | typedef struct rslv_dns_msg {
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153 | T_RSLV_DNS_HDR dns_hdr; /* DNS heder */
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154 | uint_t qd_offset; /* offset of question section */
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155 | uint_t an_offset; /* offset of answer section */
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156 | uint_t ns_offset; /* offset of authority records section */
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157 | uint_t ar_offset; /* offset of additional records section */
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158 | } __attribute__((packed))T_RSLV_DNS_MSG;
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159 |
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160 | /*
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161 | * RR (Resouce Record) å½¢å¼
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162 | *
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163 | * 0 7 8 15
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164 | * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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165 | * | . |
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166 | * +----------------- . -----------------+
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167 | * | NAME |
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168 | * +----------------- . -----------------+
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169 | * | . |
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170 | * +-----------------------------------------------+
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171 | * | TYPE |
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172 | * +-----------------------------------------------+
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173 | * | CLASS |
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174 | * +-----------------------------------------------+
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175 | * | TTL |
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176 | * | |
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177 | * +-----------------------------------------------+
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178 | * | RDLENGTH |
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179 | * +-----------------------------------------------+
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180 | * | . |
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181 | * +----------------- . -----------------+
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182 | * | RDATA |
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183 | * +----------------- . -----------------+
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184 | * | . |
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185 | * +-----------------------------------------------+
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186 | *
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187 | * 注æ: offset ã®åç¹ã¯ DNS message ã®å
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188 | é
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189 | * ã¡ã³ãã¯ãã¹ããã¤ããªã¼ãã¼
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190 | */
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191 |
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192 | typedef struct rslv_rr {
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193 | uint16_t type; /* TYPE */
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194 | uint16_t class; /* CLASS */
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195 | uint32_t ttl; /* TTL */
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196 | uint16_t rdlength; /* RDATA length */
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197 | uint_t rdata_offset; /* offset of RDATA */
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198 | } __attribute__((packed))T_RSLV_RR;
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199 |
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200 | /*
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201 | * Question section å½¢å¼
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202 | *
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203 | * 0 7 8 15
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204 | * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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205 | * | . |
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206 | * +----------------- . -----------------+
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207 | * | QNAME |
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208 | * +----------------- . -----------------+
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209 | * | . |
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210 | * +-----------------------------------------------+
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211 | * | QTYPE |
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212 | * +-----------------------------------------------+
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213 | * | QCLASS |
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214 | * +-----------------------------------------------+
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215 | *
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216 | * 注æ: ã¡ã³ãã¯ãã¹ããã¤ããªã¼ãã¼
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217 | */
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218 |
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219 | typedef struct rslv_qd {
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220 | uint16_t type; /* TYPE */
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221 | uint16_t class; /* CLASS */
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222 | } __attribute__((packed))T_RSLV_QD;
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223 |
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224 | /*
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225 | * SOA RDATA å½¢å¼
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226 | *
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227 | * 0 7 8 15
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228 | * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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229 | * | . |
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230 | * +----------------- . -----------------+
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231 | * | MNAME |
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232 | * +----------------- . -----------------+
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233 | * | . |
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234 | * +-----------------------------------------------+
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235 | * | . |
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236 | * +----------------- . -----------------+
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237 | * | RNAME |
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238 | * +----------------- . -----------------+
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239 | * | . |
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240 | * +-----------------------------------------------+
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241 | * | SERIAL |
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242 | * | |
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243 | * +-----------------------------------------------+
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244 | * | REFRESH |
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245 | * | |
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246 | * +-----------------------------------------------+
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247 | * | RETRY |
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248 | * | |
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249 | * +-----------------------------------------------+
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250 | * | EXPIRE |
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251 | * | |
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252 | * +-----------------------------------------------+
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253 | * | MINIMUM |
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254 | * | |
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255 | * +-----------------------------------------------+
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256 | *
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257 | * 注æ: offset ã®åç¹ã¯ DNS message ã®å
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258 | é
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259 | * ã¡ã³ãã¯ãã¹ããã¤ããªã¼ãã¼
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260 | */
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261 |
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262 | typedef struct rslv_soa {
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263 | uint32_t serial; /* SERIAL */
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264 | uint32_t refresh; /* REFRESH */
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265 | uint32_t retry; /* RETRY */
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266 | uint32_t expire; /* EXPIRE */
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267 | uint32_t minimum; /* MINIMUM */
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268 | } __attribute__((packed))T_RSLV_SOA;
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269 |
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270 | /*
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271 | * dns_lookup_host ã® flags ã®å®ç¾©
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272 | *
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273 | * 注æ:
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274 | * dns.h ã§å®ç¾©ããã¦ãã DNS_OPCODE ã¨éãªããªããã¨ã
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275 | * #define DNS_OPCODE_MASK 0x7800U
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276 | */
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277 |
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278 | #define DNS_LUP_FLAGS_NAME_IPV4 0x0004U
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279 | #define DNS_LUP_FLAGS_NAME_IPV6 0x0006U
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280 | #define DNS_LUP_FLAGS_NAME_HOST 0x0010U
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281 | #define DNS_LUP_FLAGS_NAME_FQDN 0x0011U
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282 | #define DNS_LUP_FLAGS_NAME_MASK 0x001fU
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283 |
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284 | #define DNS_LUP_OPCODE_FORWARD DNS_OPCODE_FORWARD
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285 | #define DNS_LUP_OPCODE_REVERSE DNS_OPCODE_REVERSE
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286 | #define DNS_LUP_OPCODE_STATUS DNS_OPCODE_STATUS
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287 | #define DNS_LUP_OPCODE_MASK DNS_OPCODE_MASK
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288 |
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289 | #define DNS_LUP_FLAGS_PROTO_IPV4 0x0040U
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290 | #define DNS_LUP_FLAGS_PROTO_IPV6 0x0080U
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291 | #define DNS_LUP_FLAGS_PROTO_MASK 0x00c0U
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292 |
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293 | #define DNS_LUP_FLAGS_QTYPE_A 0x0100U
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294 | #define DNS_LUP_FLAGS_QTYPE_AAAA 0x0200U
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295 | #define DNS_LUP_FLAGS_QTYPE_PTR 0x0400U
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296 | #define DNS_LUP_FLAGS_QTYPE_MASK 0x0700U
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297 |
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298 | #define DNS_LUP_FLAGS_MSG 0x0020U
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299 |
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300 | /*
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301 | * ãããã¯ã¼ã¯ã¨ã©ã¼ã³ã¼ã
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302 | */
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303 |
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304 | #define EV_RSLV_ESIZE (-100) /* DNSã¡ãã»ã¼ã¸ã®ååé·ç°å¸¸ */
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305 | #define EV_RSLV_UNEXPCT (-101) /* äºæããªãDNSã¡ãã»ã¼ã¸ */
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306 |
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307 | /*
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308 | * é¢æ°
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309 | */
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310 |
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311 | extern ER_UINT dns_lookup_host (uint16_t flags, char *hostname, uint8_t *msg, uint_t msg_len, T_RSLV_DNS_MSG *rslv);
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312 | extern ER dns_host_addr (uint16_t flags, char *hostname, T_IN_ADDR *addr);
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313 | extern ER_UINT dns_analyze_qd (T_RSLV_QD *qd, uint_t offset, uint8_t *msg, uint_t length);
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314 | extern ER_UINT dns_analyze_rr (T_RSLV_RR *rr, uint_t offset, uint8_t *msg, uint_t length);
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315 | extern ER_UINT dns_analyze_soa (T_RSLV_SOA *soa, uint_t offset, uint8_t *msg, uint_t length);
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316 |
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317 | /*
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318 | * 注æ: dns_in6_set_dnameãdns_in4_set_dnameã
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319 | * dns_in6_set_addrã dns_in4_set_addr ã§ã
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320 | * new ã« NULL ãæå®ããã¨ãåæå¤ã«æ»ãã
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321 | */
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322 |
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323 | extern const uint8_t *dns_in6_set_dname (const uint8_t *new, uint_t len);
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324 | extern const uint8_t *dns_in6_get_dname (void);
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325 | extern const uint8_t *dns_in4_set_dname (const uint8_t *new, uint_t len);
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326 | extern const uint8_t *dns_in4_get_dname (void);
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327 | extern T_IN6_ADDR *dns_in6_set_addr (T_IN6_ADDR *new);
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328 | extern T_IN6_ADDR *dns_in6_get_addr (T_IN6_ADDR *dst);
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329 | extern T_IN4_ADDR *dns_in4_set_addr (T_IN4_ADDR *new);
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330 | extern T_IN4_ADDR *dns_in4_get_addr (T_IN4_ADDR *dst);
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331 |
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332 | #endif /* of #ifndef RESOLVER_H */
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