[331] | 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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