[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 | /*
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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 | #include <string.h>
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| 56 |
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| 57 | #ifdef TARGET_KERNEL_ASP
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| 58 |
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| 59 | #include <kernel.h>
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| 60 | #include <t_syslog.h>
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| 61 | #include <syssvc/logtask.h>
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| 62 | #include "kernel_cfg.h"
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| 63 | #include "tinet_cfg.h"
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| 64 |
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| 65 | #endif /* of #ifdef TARGET_KERNEL_ASP */
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| 66 |
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| 67 | #ifdef TARGET_KERNEL_JSP
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| 68 |
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| 69 | #include <s_services.h>
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| 70 | #include <t_services.h>
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| 71 | #include "kernel_id.h"
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| 72 | #include "tinet_id.h"
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| 73 |
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| 74 | #endif /* of #ifdef TARGET_KERNEL_JSP */
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| 75 |
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| 76 | #include <tinet_config.h>
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| 77 |
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| 78 | #include <netinet/in.h>
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| 79 | #include <netinet/in_itron.h>
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| 80 |
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| 81 | #include <netapp/netapp.h>
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| 82 | #include <netapp/netapp_var.h>
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| 83 | #include <netapp/resolver.h>
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| 84 |
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| 85 | #if defined(USE_RESOLVER)
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| 86 |
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| 87 | /*
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| 88 | * å±æå¤æ°
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| 89 | */
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| 90 |
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| 91 | static uint8_t dns_domain_name[DNS_NAME_LENGTH + 1] = RSLV_CFG_DNS_DOMAIN_NAME_STR;
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| 92 |
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| 93 | #if defined(SUPPORT_INET6)
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| 94 | static T_IN6_ADDR in6_addr_dns = IPV6_ADDR_DNS_INIT;
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| 95 | static T_IN6_ADDR in6_addr_dns_init = IPV6_ADDR_DNS_INIT;
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| 96 | #endif
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| 97 |
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| 98 | #if defined(SUPPORT_INET4)
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| 99 | static T_IN4_ADDR in4_addr_dns = IPV4_ADDR_DNS;
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| 100 | #endif
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| 101 |
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| 102 | static uint16_t dns_msg_id = 0;
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| 103 |
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| 104 | /*
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| 105 | * get_dns_header -- DNS ã¡ãã»ã¼ã¸ãã DNS ããããåãåºãã
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| 106 | */
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| 107 |
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| 108 | static ER_UINT
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| 109 | get_dns_header (uint8_t *msg, uint_t length, T_RSLV_DNS_MSG *rslv)
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| 110 | {
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| 111 | T_DNS_HDR *dns_hdr;
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| 112 |
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| 113 | /* DNS ããããåãåºãã*/
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| 114 | if (length < sizeof(rslv->dns_hdr))
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| 115 | return EV_RSLV_ESIZE;
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| 116 | dns_hdr = (T_DNS_HDR*)msg;
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| 117 | rslv->dns_hdr.id = MSG2HOST16(dns_hdr->id);
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| 118 | rslv->dns_hdr.code = MSG2HOST16(dns_hdr->code);
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| 119 | rslv->dns_hdr.qdcount = MSG2HOST16(dns_hdr->qdcount);
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| 120 | rslv->dns_hdr.ancount = MSG2HOST16(dns_hdr->ancount);
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| 121 | rslv->dns_hdr.nscount = MSG2HOST16(dns_hdr->nscount);
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| 122 | rslv->dns_hdr.arcount = MSG2HOST16(dns_hdr->arcount);
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| 123 | return sizeof(rslv->dns_hdr);
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| 124 | }
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| 125 |
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| 126 | /*
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| 127 | * dns_strtype -- DNS ã® type ã®æååãè¿ãã
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| 128 | */
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| 129 |
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| 130 | static const char *
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| 131 | dns_flag_qtype (uint16_t flags)
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| 132 | {
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| 133 | if (flags & DNS_LUP_FLAGS_QTYPE_AAAA)
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| 134 | return "AAAA";
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| 135 | else if (flags & DNS_LUP_FLAGS_QTYPE_A)
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| 136 | return " A";
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| 137 | else if (flags & DNS_LUP_FLAGS_QTYPE_PTR)
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| 138 | return " PTR";
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| 139 | else
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| 140 | return "unknown type";
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| 141 | }
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| 142 |
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| 143 | #if defined(SUPPORT_INET6)
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| 144 |
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| 145 | /*
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| 146 | * udp6_dns -- UDP/IPv6 ã«ãã DNS ãµã¼ãããã¡ãã»ã¼ã¸ãåä¿¡ããã
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| 147 | */
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| 148 |
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| 149 | static ER
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| 150 | udp6_dns (uint16_t flags, T_IN6_ADDR *addr, uint8_t *msg, uint_t msg_size, uint_t length)
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| 151 | {
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| 152 | T_IPV6EP ep_dns;
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| 153 | ER_UINT len = E_OK;
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| 154 | int retry;
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| 155 |
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| 156 | /* DNS ãµã¼ãã® IPv6 ã¢ãã¬ã¹ãæªå®ç¾©ã®æã¯ãã©ã¡ã¼ã¿ã¨ã©ã¼ */
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| 157 | if (IN6_IS_ADDR_UNSPECIFIED(addr) || (in6_is_addr_ipv4mapped(addr) && addr->s6_addr32[3] == IPV4_ADDRANY)) {
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| 158 | syslog(LOG_NOTICE, "[RSLV] undefined IPv6 DNS server address.");
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| 159 | return E_PAR;
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| 160 | }
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| 161 |
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| 162 | memcpy(&ep_dns.ipaddr, addr, sizeof(*addr));
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| 163 | ep_dns.portno = RSLV_CFG_DNS_PORTNO;
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| 164 | for (retry = NUM_DNS_UDP_RETRY + 1; retry -- > 0; ) {
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| 165 | if ((len = udp6_snd_dat(UDP6_RESOLVER_CEPID, &ep_dns, msg, length, TMO_DNS_UDP_SND)) >= 0) {
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| 166 | if ((len = udp6_rcv_dat(UDP6_RESOLVER_CEPID, &ep_dns, msg, msg_size, TMO_DNS_UDP_RCV)) >= 0)
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| 167 | return len;
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| 168 | }
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| 169 | if (flags & DNS_LUP_FLAGS_MSG) {
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| 170 | if (len == E_TMOUT)
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| 171 | syslog(LOG_NOTICE, "[RSLV] TMOUT: %d, type: %s, server: %s.%d.",
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| 172 | NUM_DNS_UDP_RETRY + 1 - retry,
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| 173 | dns_flag_qtype(flags),
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| 174 | ipv62str(NULL, &ep_dns.ipaddr), ep_dns.portno);
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| 175 | else {
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| 176 | syslog(LOG_NOTICE, "[RSLV] error: %s, type: %s,\n server: %s.%d.",
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| 177 | itron_strerror(len),
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| 178 | dns_flag_qtype(flags),
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| 179 | ipv62str(NULL, &ep_dns.ipaddr), ep_dns.portno);
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| 180 | return len;
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| 181 | }
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| 182 | }
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| 183 | }
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| 184 | return E_TMOUT;
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| 185 | }
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| 186 |
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| 187 | #endif /* of #if defined(SUPPORT_INET6) */
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| 188 |
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| 189 | #if defined(SUPPORT_INET4)
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| 190 |
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| 191 | /*
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| 192 | * udp4_dns -- UDP/IPv4 ã«ãã DNS ãµã¼ãããã¡ãã»ã¼ã¸ãåä¿¡ããã
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| 193 | */
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| 194 |
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| 195 | static ER
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| 196 | udp4_dns (uint16_t flags, T_IN4_ADDR *addr, uint8_t *msg, uint_t msg_size, uint_t length)
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| 197 | {
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| 198 | T_IPV4EP ep_dns;
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| 199 | ER_UINT len = E_OK;
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| 200 | int retry;
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| 201 |
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| 202 | /* DNS ãµã¼ãã® IPv4 ã¢ãã¬ã¹ãæªå®ç¾©ã®æã¯ãã©ã¡ã¼ã¿ã¨ã©ã¼ */
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| 203 | if (*addr == IPV4_ADDRANY) {
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| 204 | syslog(LOG_NOTICE, "[RSLV] undefined IPv4 DNS server address.");
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| 205 | return E_PAR;
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| 206 | }
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| 207 |
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| 208 | memcpy(&ep_dns.ipaddr, addr, sizeof(*addr));
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| 209 | ep_dns.portno = RSLV_CFG_DNS_PORTNO;
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| 210 | for (retry = NUM_DNS_UDP_RETRY + 1; retry -- > 0; ) {
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| 211 | if ((len = udp_snd_dat(UDP4_RESOLVER_CEPID, &ep_dns, msg, length, TMO_DNS_UDP_SND)) >= 0) {
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| 212 | if ((len = udp_rcv_dat(UDP4_RESOLVER_CEPID, &ep_dns, msg, msg_size, TMO_DNS_UDP_RCV)) >= 0)
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| 213 | return len;
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| 214 | }
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| 215 | if (flags & DNS_LUP_FLAGS_MSG) {
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| 216 | if (len == E_TMOUT)
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| 217 | syslog(LOG_NOTICE, "[RSLV] TMOUT: %d, type: %s, server: %s.%d.",
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| 218 | NUM_DNS_UDP_RETRY + 1 - retry,
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| 219 | dns_flag_qtype(flags),
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| 220 | ip2str(NULL, &ep_dns.ipaddr), ep_dns.portno);
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| 221 | else {
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| 222 | syslog(LOG_NOTICE, "[RSLV] error: %s, type: %s, server: %s.%d.",
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| 223 | itron_strerror(len),
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| 224 | dns_flag_qtype(flags),
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| 225 | ip2str(NULL, &ep_dns.ipaddr), ep_dns.portno);
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| 226 | return len;
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| 227 | }
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| 228 | }
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| 229 | }
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| 230 | return E_TMOUT;
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| 231 | }
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| 232 |
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| 233 | #endif /* of #if defined(SUPPORT_INET4) */
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| 234 |
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| 235 | /*
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| 236 | * skip_label -- ã©ãã«ãèªã¿é£ã°ãã
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| 237 | */
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| 238 |
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| 239 | static char *
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| 240 | skip_label (char *name)
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| 241 | {
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| 242 | while (!(*name == '\0' || *name == '.'))
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| 243 | name ++;
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| 244 | return name;
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| 245 | }
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| 246 |
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| 247 | /*
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| 248 | * add_name -- ã¡ãã»ã¼ã¸ã«ååã追å ããã
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| 249 | */
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| 250 |
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| 251 | static ER_UINT
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| 252 | add_name (uint8_t *msg, uint_t size, uint_t offset, char *name)
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| 253 | {
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| 254 | uint_t label_len;
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| 255 | uint8_t *tail;
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| 256 |
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| 257 | while (*name != '\0') {
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| 258 |
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| 259 | /* ã¡ãã»ã¼ã¸ãµã¤ãºã«éãã¦ãããã¨ã©ã¼ */
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| 260 | if (offset + 1 > size)
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| 261 | return E_BOVR;
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| 262 |
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| 263 | /* ã©ãã«ã®çµãããè¦ã¤ããã*/
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| 264 | tail = skip_label(name);
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| 265 |
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| 266 | /* ã©ãã«é·ãè¨å®ããã*/
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| 267 | label_len = tail - (uint8_t*)name;
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| 268 | if (label_len > DNS_LABEL_LENGTH) { /* 63 ãªã¯ããããè¶
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| 269 | ããã¨ã¨ã©ã¼ */
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| 270 | syslog(LOG_NOTICE, "[RSLV] label length(%d) too long > %d.",
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| 271 | label_len, DNS_LABEL_LENGTH);
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| 272 | return E_PAR;
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| 273 | }
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| 274 |
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| 275 | *(msg + offset) = (uint8_t)label_len;
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| 276 | offset ++;
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| 277 |
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| 278 | /* ã©ãã«åãè¨å®ããã*/
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| 279 | if (offset + label_len > size) { /* ã¡ãã»ã¼ã¸ãµã¤ãºãè¶
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| 280 | ããã¨ã¨ã©ã¼ */
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| 281 | syslog(LOG_NOTICE, "[RSLV] message length(%d) too long > %d.",
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| 282 | offset + label_len, size);
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| 283 | return E_BOVR;
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| 284 | }
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| 285 |
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| 286 | memcpy((void*)(msg + offset), (void*)name, label_len);
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| 287 | offset += label_len;
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| 288 |
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| 289 | /* 次ã®ã©ãã«ã«ç§»åããã*/
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| 290 | if (*tail == '\0')
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| 291 | name = tail;
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| 292 | else
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| 293 | name = tail + 1; /* '.' ãã¹ãããããã*/
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| 294 | }
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| 295 |
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| 296 | return offset;
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| 297 | }
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| 298 |
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| 299 | /*
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| 300 | * add_ipv6addr -- ã¡ãã»ã¼ã¸ã« IPv6 ã¢ãã¬ã¹ã追å ããã
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| 301 | */
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| 302 |
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| 303 | static ER_UINT
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| 304 | add_ipv6addr (uint8_t *msg, uint_t size, uint_t offset, char *name)
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| 305 | {
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| 306 | T_IN6_ADDR addr;
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| 307 | ER_UINT error;
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| 308 | uint_t len;
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| 309 | int col;
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| 310 | char digit[2];
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| 311 |
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| 312 | len = strlen(name);
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| 313 | if (len == 0)
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| 314 | return E_PAR;
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| 315 |
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| 316 | digit[1] = '\0';
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| 317 | get_ipv6addr(&addr, name);
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| 318 | for (col = sizeof(T_IN6_ADDR) * 2; -- col >= 0; ) {
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| 319 |
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| 320 | /* 16é²æ° 1æ¡ã®å¤ããååã¨ãã¦è¿½å ããã*/
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| 321 | digit[0] = (addr.s6_addr8[col / 2] >> ((1 - (col % 2)) << 2)) & 0x0f;
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| 322 | if (digit[0] >= 10)
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| 323 | digit[0] += 'a' - 10;
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| 324 | else
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| 325 | digit[0] += '0';
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| 326 | if ((error = add_name(msg, size, offset, digit)) < 0)
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| 327 | return error;
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| 328 | offset = error;
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| 329 | }
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| 330 |
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| 331 | /* "ip6" ã追å ããã*/
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| 332 | if ((error = add_name(msg, size, offset, "ip6")) < 0)
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| 333 | return error;
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| 334 |
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| 335 | /* "arpa" ã追å ããã*/
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| 336 | return add_name(msg, size, error, "arpa");
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| 337 | }
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| 338 |
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| 339 | /*
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| 340 | * add_ipv4addr -- ã¡ãã»ã¼ã¸ã« IPv4 ã¢ãã¬ã¹ã追å ããã
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| 341 | */
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| 342 |
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| 343 | static ER_UINT
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| 344 | add_ipv4addr (uint8_t *msg, uint_t size, uint_t offset, char *name)
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| 345 | {
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| 346 | T_IN4_ADDR addr;
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| 347 | ER_UINT error;
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| 348 | uint_t len, octet;
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| 349 | int col;
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| 350 | char *op, ostr[4];
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| 351 |
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| 352 | len = strlen(name);
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| 353 | if (len == 0)
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| 354 | return E_PAR;
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| 355 |
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| 356 | ostr[3] = '\0';
|
---|
| 357 | get_ipv4addr(&addr, name);
|
---|
| 358 | for (col = 0; col < sizeof(T_IN4_ADDR); col ++) {
|
---|
| 359 |
|
---|
| 360 | /* 1ãªã¯ãããã®å¤ããæ´æ°å¤ãããªãã©ã«ã«å¤æããã*/
|
---|
| 361 | octet = (addr >> (col << 3)) & 0xff;
|
---|
| 362 | op = &ostr[3];
|
---|
| 363 | while (octet > 0) {
|
---|
| 364 | *(-- op) = octet % 10 + '0';
|
---|
| 365 | octet /= 10;
|
---|
| 366 | }
|
---|
| 367 |
|
---|
| 368 | /* 1ãªã¯ãããã®å¤ããååã¨ãã¦è¿½å ããã*/
|
---|
| 369 | if ((error = add_name(msg, size, offset, op)) < 0)
|
---|
| 370 | return error;
|
---|
| 371 | offset = error;
|
---|
| 372 | }
|
---|
| 373 |
|
---|
| 374 | /* "in-addr" ã追å ããã*/
|
---|
| 375 | if ((error = add_name(msg, size, offset, "in-addr")) < 0)
|
---|
| 376 | return error;
|
---|
| 377 |
|
---|
| 378 | /* "arpa" ã追å ããã*/
|
---|
| 379 | return add_name(msg, size, error, "arpa");
|
---|
| 380 | }
|
---|
| 381 |
|
---|
| 382 | /*
|
---|
| 383 | * setup_dns_msg -- DNS ã¡ãã»ã¼ã¸ãä½æããã
|
---|
| 384 | */
|
---|
| 385 |
|
---|
| 386 | static ER
|
---|
| 387 | setup_dns_msg (uint16_t flags, char *name, uint8_t *msg, uint_t msg_size)
|
---|
| 388 | {
|
---|
| 389 | T_DNS_HDR dns_hdr;
|
---|
| 390 | ER_UINT offset;
|
---|
| 391 |
|
---|
| 392 | memset((void*)&dns_hdr, 0, sizeof(dns_hdr));
|
---|
| 393 |
|
---|
| 394 | dns_msg_id++;
|
---|
| 395 | HOST2MSG16(dns_hdr.id, dns_msg_id);
|
---|
| 396 | HOST2MSG16(dns_hdr.code, (flags & DNS_OPCODE_MASK) | DNS_RECURSION_DESIRED);
|
---|
| 397 | HOST2MSG16(dns_hdr.qdcount, 1);
|
---|
| 398 |
|
---|
| 399 | memcpy((void*)msg, (void*)&dns_hdr, sizeof(dns_hdr));
|
---|
| 400 | offset = sizeof(dns_hdr);
|
---|
| 401 |
|
---|
| 402 | switch (flags & DNS_LUP_FLAGS_NAME_MASK) {
|
---|
| 403 |
|
---|
| 404 | case DNS_LUP_FLAGS_NAME_HOST:
|
---|
| 405 | case DNS_LUP_FLAGS_NAME_FQDN:
|
---|
| 406 |
|
---|
| 407 | /* ãã¹ãåãã¾ã㯠FQDN ã®æã®å¦çã*/
|
---|
| 408 | /* ãã¹ãåã追å ããã*/
|
---|
| 409 | if ((offset = add_name(msg, msg_size, offset, name)) < 0)
|
---|
| 410 | return offset;
|
---|
| 411 |
|
---|
| 412 | if (offset - sizeof(dns_hdr) > DNS_NAME_LENGTH) { /* ååã 255 ãªã¯ããããè¶
|
---|
| 413 | ããã¨ã¨ã©ã¼ */
|
---|
| 414 | syslog(LOG_NOTICE, "[RSLV] name length(%d) too long > %d.",
|
---|
| 415 | offset - sizeof(dns_hdr), DNS_NAME_LENGTH);
|
---|
| 416 | return E_PAR;
|
---|
| 417 | }
|
---|
| 418 |
|
---|
| 419 | /* ãã¹ãåã ãã®æã¯ããã¡ã¤ã³åã追å ããã*/
|
---|
| 420 | if ((flags & DNS_LUP_FLAGS_NAME_MASK) == DNS_LUP_FLAGS_NAME_HOST) {
|
---|
| 421 |
|
---|
| 422 | /* ãã¡ã¤ã³åã追å ããã*/
|
---|
| 423 | if ((offset = add_name(msg, msg_size, offset, dns_domain_name)) < 0)
|
---|
| 424 | return offset;
|
---|
| 425 |
|
---|
| 426 | if (offset - sizeof(dns_hdr) > DNS_NAME_LENGTH) { /* ååã 255 ãªã¯ããããè¶
|
---|
| 427 | ããã¨ã¨ã©ã¼ */
|
---|
| 428 | syslog(LOG_NOTICE, "[RSLV] name length(%d) too long > %d.",
|
---|
| 429 | offset - sizeof(dns_hdr), DNS_NAME_LENGTH);
|
---|
| 430 | return E_PAR;
|
---|
| 431 | }
|
---|
| 432 | }
|
---|
| 433 | break;
|
---|
| 434 |
|
---|
| 435 | case DNS_LUP_FLAGS_NAME_IPV4:
|
---|
| 436 | if ((offset = add_ipv4addr(msg, msg_size, offset, name)) < 0)
|
---|
| 437 | return offset;
|
---|
| 438 | break;
|
---|
| 439 |
|
---|
| 440 | case DNS_LUP_FLAGS_NAME_IPV6:
|
---|
| 441 | if ((offset = add_ipv6addr(msg, msg_size, offset, name)) < 0)
|
---|
| 442 | return offset;
|
---|
| 443 | break;
|
---|
| 444 |
|
---|
| 445 | default:
|
---|
| 446 | syslog(LOG_NOTICE, "[RSLV] unknown name type: %04x.", flags & DNS_LUP_FLAGS_NAME_MASK);
|
---|
| 447 | return E_PAR;
|
---|
| 448 | break;
|
---|
| 449 |
|
---|
| 450 | }
|
---|
| 451 |
|
---|
| 452 | /* ååã®çµäºã³ã¼ããTYPEãCLASS ã追å ãã¦ãã¡ãã»ã¼ã¸é·ãè¶
|
---|
| 453 | ããªããã¨ã確èªããã*/
|
---|
| 454 | if (offset + sizeof(uint16_t) * 2 + 1 > msg_size) {
|
---|
| 455 | syslog(LOG_NOTICE, "[RSLV] message length(%d) too long > %d.",
|
---|
| 456 | offset + sizeof(uint16_t) * 2 + 1, msg_size);
|
---|
| 457 | return E_BOVR;
|
---|
| 458 | }
|
---|
| 459 |
|
---|
| 460 | /* ååã®çµäºã³ã¼ããè¨å®ããã*/
|
---|
| 461 | *(msg + offset) = '\0';
|
---|
| 462 | offset ++;
|
---|
| 463 |
|
---|
| 464 | /* DNS ã® TYPE ãè¨å®ããã*/
|
---|
| 465 | if (flags & DNS_LUP_FLAGS_QTYPE_PTR)
|
---|
| 466 | host2msg16(msg + offset, DNS_TYPE_PTR);
|
---|
| 467 | else if (flags & DNS_LUP_FLAGS_QTYPE_AAAA)
|
---|
| 468 | host2msg16(msg + offset, DNS_TYPE_AAAA);
|
---|
| 469 | else if (flags & DNS_LUP_FLAGS_QTYPE_A)
|
---|
| 470 | host2msg16(msg + offset, DNS_TYPE_A);
|
---|
| 471 | else {
|
---|
| 472 | syslog(LOG_NOTICE, "[RSLV] unknown query type: %04x.", flags & DNS_LUP_FLAGS_QTYPE_MASK);
|
---|
| 473 | return E_PAR;
|
---|
| 474 | }
|
---|
| 475 | offset += sizeof(uint16_t);
|
---|
| 476 |
|
---|
| 477 | /* DNS ã® CLASS ãè¨å®ããã*/
|
---|
| 478 | host2msg16(msg + offset, DNS_CLASS_IN);
|
---|
| 479 |
|
---|
| 480 | return offset + sizeof(uint16_t);
|
---|
| 481 | }
|
---|
| 482 |
|
---|
| 483 | /*
|
---|
| 484 | * skip_dns_name -- DNS ã¡ãã»ã¼ã¸ã®ååãèªã¿é£ã°ãã
|
---|
| 485 | *
|
---|
| 486 | * 注æ: å§ç¸®å½¢å¼ãèæ
|
---|
| 487 | ®ãããä¸ä½ 2ãããã 11ãªãå§ç¸®å½¢å¼ã
|
---|
| 488 | */
|
---|
| 489 |
|
---|
| 490 | static ER_UINT
|
---|
| 491 | skip_dns_name (uint8_t *name, uint_t offset, uint_t length)
|
---|
| 492 | {
|
---|
| 493 | while (*(name + offset)) {
|
---|
| 494 | if ((*(name + offset) & 0xc0) == 0xc0) {
|
---|
| 495 | if (offset + 2 > length)
|
---|
| 496 | return EV_RSLV_ESIZE;
|
---|
| 497 | else
|
---|
| 498 | return offset + 2;
|
---|
| 499 | }
|
---|
| 500 | else if (offset + *name + 1 > length)
|
---|
| 501 | return EV_RSLV_ESIZE;
|
---|
| 502 | else
|
---|
| 503 | offset += *name + 1;
|
---|
| 504 | }
|
---|
| 505 | return offset + 1;
|
---|
| 506 | }
|
---|
| 507 |
|
---|
| 508 | /*
|
---|
| 509 | * skip_dns_qd -- DNS Question section ãèªã¿é£ã°ãã
|
---|
| 510 | */
|
---|
| 511 |
|
---|
| 512 | static ER_UINT
|
---|
| 513 | skip_dns_qd (uint8_t *msg, uint_t offset, uint_t length, uint_t count)
|
---|
| 514 | {
|
---|
| 515 | ER_UINT next;
|
---|
| 516 |
|
---|
| 517 | while (count != 0) {
|
---|
| 518 | /* name ãèªã¿é£ã°ãã*/
|
---|
| 519 | if ((next = skip_dns_name(msg, offset, length)) < 0)
|
---|
| 520 | return next;
|
---|
| 521 | offset = next;
|
---|
| 522 |
|
---|
| 523 | /* typeãclass ãèªã¿é£ã°ãã*/
|
---|
| 524 | if ((offset + sizeof(uint16_t) + sizeof(uint16_t)) > length)
|
---|
| 525 | return EV_RSLV_ESIZE;
|
---|
| 526 | offset += sizeof(uint16_t) + sizeof(uint16_t);
|
---|
| 527 |
|
---|
| 528 | count --;
|
---|
| 529 | }
|
---|
| 530 |
|
---|
| 531 | return offset;
|
---|
| 532 | }
|
---|
| 533 |
|
---|
| 534 | /*
|
---|
| 535 | * skip_dns_rr -- DNS RR ãèªã¿é£ã°ãã
|
---|
| 536 | */
|
---|
| 537 |
|
---|
| 538 | static ER_UINT
|
---|
| 539 | skip_dns_rr (uint8_t *msg, uint_t offset, uint_t length, uint_t count)
|
---|
| 540 | {
|
---|
| 541 | ER_UINT next;
|
---|
| 542 | uint16_t len = 0;
|
---|
| 543 |
|
---|
| 544 | while (count != 0) {
|
---|
| 545 | /* name ãèªã¿é£ã°ãã*/
|
---|
| 546 | if ((next = skip_dns_name(msg, offset, length)) < 0)
|
---|
| 547 | return next;
|
---|
| 548 | offset = next;
|
---|
| 549 |
|
---|
| 550 | /* typeãclassãTTL ãèªã¿é£ã°ãã*/
|
---|
| 551 | if (offset + sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t) > length)
|
---|
| 552 | return EV_RSLV_ESIZE;
|
---|
| 553 | offset += sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t);
|
---|
| 554 |
|
---|
| 555 | /* RD length 㨠RDATA ãèªã¿é£ã°ãã*/
|
---|
| 556 | if (offset + sizeof(uint16_t) > length)
|
---|
| 557 | return EV_RSLV_ESIZE;
|
---|
| 558 | len = msg2host16(msg + offset);
|
---|
| 559 |
|
---|
| 560 | if (offset + sizeof(uint16_t) + len > length)
|
---|
| 561 | return EV_RSLV_ESIZE;
|
---|
| 562 | offset += sizeof(uint16_t) + len;
|
---|
| 563 |
|
---|
| 564 | count --;
|
---|
| 565 | }
|
---|
| 566 |
|
---|
| 567 | return offset;
|
---|
| 568 | }
|
---|
| 569 |
|
---|
| 570 | /*
|
---|
| 571 | * dns_analyze_qd -- DNS ã¡ãã»ã¼ã¸ã® question section ã解æããã
|
---|
| 572 | */
|
---|
| 573 |
|
---|
| 574 | ER_UINT
|
---|
| 575 | dns_analyze_qd (T_RSLV_QD *qd, uint_t offset, uint8_t *msg, uint_t length)
|
---|
| 576 | {
|
---|
| 577 | ER_UINT error;
|
---|
| 578 | T_DNS_QD *dns_qd;
|
---|
| 579 |
|
---|
| 580 | if ((error = skip_dns_name(msg, offset, length)) < 0)
|
---|
| 581 | return error;
|
---|
| 582 | offset = error;
|
---|
| 583 |
|
---|
| 584 | /* DNS ã¡ãã»ã¼ã¸å
|
---|
| 585 | ã®å½¢å¼ã®ãµã¤ãºã§ãã§ãã¯ããã*/
|
---|
| 586 | if (offset + T_DNS_QD_SIZE > length)
|
---|
| 587 | return EV_RSLV_ESIZE;
|
---|
| 588 |
|
---|
| 589 | /*
|
---|
| 590 | * DNS ã¡ãã»ã¼ã¸å
|
---|
| 591 | ã® SOA RDATA ããã¤ããªã¼ãã¼ã調æ´ãã¦
|
---|
| 592 | * å
|
---|
| 593 | é¨æ§é ä½ã«ã³ãã¼ããã
|
---|
| 594 | */
|
---|
| 595 | dns_qd = (T_DNS_QD*)(msg + offset);
|
---|
| 596 | qd->type = MSG2HOST16(dns_qd->type);
|
---|
| 597 | qd->class = MSG2HOST16(dns_qd->class);
|
---|
| 598 |
|
---|
| 599 | return offset + T_DNS_QD_SIZE;
|
---|
| 600 | }
|
---|
| 601 |
|
---|
| 602 | /*
|
---|
| 603 | * dns_analyze_soa -- DNS ã¡ãã»ã¼ã¸ã® SOA RDATA ã解æããã
|
---|
| 604 | */
|
---|
| 605 |
|
---|
| 606 | ER_UINT
|
---|
| 607 | dns_analyze_soa (T_RSLV_SOA *soa, uint_t offset, uint8_t *msg, uint_t length)
|
---|
| 608 | {
|
---|
| 609 | ER_UINT error;
|
---|
| 610 | T_DNS_SOA *dns_soa;
|
---|
| 611 |
|
---|
| 612 | /* MNAME ãã¹ãããããã*/
|
---|
| 613 | if ((error = skip_dns_name(msg, offset, length)) < 0)
|
---|
| 614 | return error;
|
---|
| 615 | offset = error;
|
---|
| 616 |
|
---|
| 617 | /* RNAME ãã¹ãããããã*/
|
---|
| 618 | if ((error = skip_dns_name(msg, offset, length)) < 0)
|
---|
| 619 | return error;
|
---|
| 620 | offset = error;
|
---|
| 621 |
|
---|
| 622 | /* DNS ã¡ãã»ã¼ã¸å
|
---|
| 623 | ã®å½¢å¼ã®ãµã¤ãºã§ãã§ãã¯ããã*/
|
---|
| 624 | if (offset + T_DNS_SOA_SIZE > length)
|
---|
| 625 | return EV_RSLV_ESIZE;
|
---|
| 626 |
|
---|
| 627 | /*
|
---|
| 628 | * DNS ã¡ãã»ã¼ã¸å
|
---|
| 629 | ã® SOA RDATA ããã¤ããªã¼ãã¼ã調æ´ãã¦
|
---|
| 630 | * å
|
---|
| 631 | é¨æ§é ä½ã«ã³ãã¼ããã
|
---|
| 632 | */
|
---|
| 633 | dns_soa = (T_DNS_SOA*)(msg + offset);
|
---|
| 634 | soa->serial = MSG2HOST32(dns_soa->serial);
|
---|
| 635 | soa->refresh = MSG2HOST32(dns_soa->refresh);
|
---|
| 636 | soa->retry = MSG2HOST32(dns_soa->retry);
|
---|
| 637 | soa->expire = MSG2HOST32(dns_soa->expire);
|
---|
| 638 | soa->minimum = MSG2HOST32(dns_soa->minimum);
|
---|
| 639 |
|
---|
| 640 | return offset + T_DNS_SOA_SIZE;
|
---|
| 641 | }
|
---|
| 642 |
|
---|
| 643 | /*
|
---|
| 644 | * dns_analyze_rr -- DNS ã¡ãã»ã¼ã¸ã® AN/NS/AR section ã解æããã
|
---|
| 645 | */
|
---|
| 646 |
|
---|
| 647 | ER_UINT
|
---|
| 648 | dns_analyze_rr (T_RSLV_RR *rr, uint_t offset, uint8_t *msg, uint_t length)
|
---|
| 649 | {
|
---|
| 650 | ER_UINT error;
|
---|
| 651 | T_DNS_RR *dns_rr;
|
---|
| 652 |
|
---|
| 653 | if ((error = skip_dns_name(msg, offset, length)) < 0)
|
---|
| 654 | return error;
|
---|
| 655 | offset = error;
|
---|
| 656 |
|
---|
| 657 | /* DNS ã¡ãã»ã¼ã¸å
|
---|
| 658 | ã®å½¢å¼ã®ãµã¤ãºã§ãã§ãã¯ããã*/
|
---|
| 659 | if (offset + T_DNS_RR_SIZE > length)
|
---|
| 660 | return EV_RSLV_ESIZE;
|
---|
| 661 |
|
---|
| 662 | /*
|
---|
| 663 | * DNS ã¡ãã»ã¼ã¸å
|
---|
| 664 | ã® SOA RDATA ããã¤ããªã¼ãã¼ã調æ´ãã¦
|
---|
| 665 | * å
|
---|
| 666 | é¨æ§é ä½ã«ã³ãã¼ããã
|
---|
| 667 | */
|
---|
| 668 | dns_rr = (T_DNS_RR*)(msg + offset);
|
---|
| 669 | rr->type = MSG2HOST16(dns_rr->type);
|
---|
| 670 | rr->class = MSG2HOST16(dns_rr->class);
|
---|
| 671 | rr->ttl = MSG2HOST32(dns_rr->ttl);
|
---|
| 672 | rr->rdlength = MSG2HOST16(dns_rr->rdlength);
|
---|
| 673 | rr->rdata_offset= offset + sizeof(rr->type) + sizeof(rr->class)
|
---|
| 674 | + sizeof(rr->ttl) + sizeof(rr->rdlength);
|
---|
| 675 |
|
---|
| 676 | return offset + T_DNS_RR_SIZE + rr->rdlength;
|
---|
| 677 | }
|
---|
| 678 |
|
---|
| 679 | /*
|
---|
| 680 | * analyze_dns_msg -- DNS ã¡ãã»ã¼ã¸ã解æããã
|
---|
| 681 | */
|
---|
| 682 |
|
---|
| 683 | static ER_UINT
|
---|
| 684 | analyze_dns_msg (uint8_t *msg, uint_t length, T_RSLV_DNS_MSG *rslv)
|
---|
| 685 | {
|
---|
| 686 | ER_UINT offset;
|
---|
| 687 |
|
---|
| 688 | /* DNS ããããåãåºãã*/
|
---|
| 689 | if ((offset = get_dns_header(msg, length, rslv)) < 0)
|
---|
| 690 | return offset;
|
---|
| 691 |
|
---|
| 692 | /* question section ãèªã¿é£ã°ãã*/
|
---|
| 693 | rslv->qd_offset = offset;
|
---|
| 694 | if ((offset = skip_dns_qd(msg, offset, length, rslv->dns_hdr.qdcount)) < 0)
|
---|
| 695 | return offset;
|
---|
| 696 |
|
---|
| 697 | /* answer section ãèªã¿é£ã°ãã*/
|
---|
| 698 | rslv->an_offset = offset;
|
---|
| 699 | if ((offset = skip_dns_rr(msg, offset, length, rslv->dns_hdr.ancount)) < 0)
|
---|
| 700 | return offset;
|
---|
| 701 |
|
---|
| 702 | /* authority records section ãèªã¿é£ã°ãã*/
|
---|
| 703 | rslv->ns_offset = offset;
|
---|
| 704 | if ((offset = skip_dns_rr(msg, offset, length, rslv->dns_hdr.nscount)) < 0)
|
---|
| 705 | return offset;
|
---|
| 706 |
|
---|
| 707 | /* additional records section ãèªã¿é£ã°ãã*/
|
---|
| 708 | rslv->ar_offset = offset;
|
---|
| 709 | if ((offset = skip_dns_rr(msg, offset, length, rslv->dns_hdr.arcount)) < 0)
|
---|
| 710 | return offset;
|
---|
| 711 |
|
---|
| 712 | return E_OK;
|
---|
| 713 | }
|
---|
| 714 |
|
---|
| 715 | /*
|
---|
| 716 | * dns_lookup_host_sub -- DNS ã«ãããã¹ãã®æ
|
---|
| 717 | å ±ãåå¾ããï¼è£å©é¢æ°ï¼ã
|
---|
| 718 | */
|
---|
| 719 |
|
---|
| 720 | static ER_UINT
|
---|
| 721 | dns_lookup_host_sub (uint16_t flags, char *hostname, uint8_t *msg,
|
---|
| 722 | uint_t msg_size, T_RSLV_DNS_MSG *rslv)
|
---|
| 723 | {
|
---|
| 724 | #if defined(SUPPORT_INET6) && defined(SUPPORT_INET4)
|
---|
| 725 | uint16_t proto;
|
---|
| 726 | #endif
|
---|
| 727 | ER_UINT length;
|
---|
| 728 | ER error;
|
---|
| 729 |
|
---|
| 730 | if ((length = setup_dns_msg(flags, hostname, msg, msg_size)) < 0)
|
---|
| 731 | return length;
|
---|
| 732 |
|
---|
| 733 | #if defined(SUPPORT_INET6)
|
---|
| 734 |
|
---|
| 735 | #if defined(SUPPORT_INET4)
|
---|
| 736 |
|
---|
| 737 | if (flags & DNS_LUP_FLAGS_PROTO_IPV6) {
|
---|
| 738 | proto = DNS_LUP_FLAGS_PROTO_IPV6;
|
---|
| 739 | if ((length = udp6_dns(flags, &in6_addr_dns, msg, msg_size, length)) < 0)
|
---|
| 740 | return length;
|
---|
| 741 | }
|
---|
| 742 | else if (flags & DNS_LUP_FLAGS_PROTO_IPV4) {
|
---|
| 743 | proto = DNS_LUP_FLAGS_PROTO_IPV4;
|
---|
| 744 | if ((length = udp4_dns(flags, &in4_addr_dns, msg, msg_size, length)) < 0)
|
---|
| 745 | return length;
|
---|
| 746 | }
|
---|
| 747 | else {
|
---|
| 748 | syslog(LOG_NOTICE, "[RSLV] unknown lookup protocol: %04x.", flags & DNS_LUP_FLAGS_PROTO_MASK);
|
---|
| 749 | return E_PAR;
|
---|
| 750 | }
|
---|
| 751 |
|
---|
| 752 | #else /* of #if defined(SUPPORT_INET4) */
|
---|
| 753 |
|
---|
| 754 | if (flags & DNS_LUP_FLAGS_PROTO_IPV6) {
|
---|
| 755 | if ((length = udp6_dns(flags, &in6_addr_dns, msg, msg_size, length)) < 0)
|
---|
| 756 | return length;
|
---|
| 757 | }
|
---|
| 758 | else {
|
---|
| 759 | syslog(LOG_NOTICE, "[RSLV] unknown lookup protocol: %04x.", flags & DNS_LUP_FLAGS_PROTO_MASK);
|
---|
| 760 | return E_PAR;
|
---|
| 761 | }
|
---|
| 762 |
|
---|
| 763 | #endif /* of #if defined(SUPPORT_INET4) */
|
---|
| 764 |
|
---|
| 765 | #else /* of #if defined(SUPPORT_INET6) */
|
---|
| 766 |
|
---|
| 767 | #if defined(SUPPORT_INET4)
|
---|
| 768 |
|
---|
| 769 | if (flags & DNS_LUP_FLAGS_PROTO_IPV4) {
|
---|
| 770 | if ((length = udp4_dns(flags, &in4_addr_dns, msg, msg_size, length)) < 0)
|
---|
| 771 | return length;
|
---|
| 772 | }
|
---|
| 773 | else {
|
---|
| 774 | syslog(LOG_NOTICE, "[RSLV] unknown lookup protocol: %04x.", flags & DNS_LUP_FLAGS_PROTO_MASK);
|
---|
| 775 | return E_PAR;
|
---|
| 776 | }
|
---|
| 777 |
|
---|
| 778 | #endif /* of #if defined(SUPPORT_INET4) */
|
---|
| 779 |
|
---|
| 780 | #endif /* of #if defined(SUPPORT_INET6) */
|
---|
| 781 |
|
---|
| 782 | if ((error = analyze_dns_msg(msg, length, rslv)) != E_OK)
|
---|
| 783 | return error;
|
---|
| 784 | else {
|
---|
| 785 | if ((rslv->dns_hdr.ancount > 0) && (flags & DNS_LUP_FLAGS_MSG)) {
|
---|
| 786 |
|
---|
| 787 | #if defined(SUPPORT_INET6)
|
---|
| 788 |
|
---|
| 789 | #if defined(SUPPORT_INET4)
|
---|
| 790 |
|
---|
| 791 | if (proto & DNS_LUP_FLAGS_PROTO_IPV6) {
|
---|
| 792 | syslog(LOG_NOTICE, "[RSLV] reslv: type: %s, server: %s.%d.",
|
---|
| 793 | dns_flag_qtype(flags),
|
---|
| 794 | ipv62str(NULL, &in6_addr_dns),
|
---|
| 795 | RSLV_CFG_DNS_PORTNO);
|
---|
| 796 | }
|
---|
| 797 | else {
|
---|
| 798 | syslog(LOG_NOTICE, "[RSLV] reslv: type: %s, server: %s.%d.",
|
---|
| 799 | dns_flag_qtype(flags),
|
---|
| 800 | ip2str(NULL, &in4_addr_dns),
|
---|
| 801 | RSLV_CFG_DNS_PORTNO);
|
---|
| 802 | }
|
---|
| 803 |
|
---|
| 804 | #else /* of #if defined(SUPPORT_INET4) */
|
---|
| 805 |
|
---|
| 806 | syslog(LOG_NOTICE, "[RSLV] reslv: type: %s, server: %s.%d.",
|
---|
| 807 | dns_flag_qtype(flags),
|
---|
| 808 | ipv62str(NULL, &in6_addr_dns),
|
---|
| 809 | RSLV_CFG_DNS_PORTNO);
|
---|
| 810 |
|
---|
| 811 | #endif /* of #if defined(SUPPORT_INET4) */
|
---|
| 812 |
|
---|
| 813 | #else /* of #if defined(SUPPORT_INET6) */
|
---|
| 814 |
|
---|
| 815 | #if defined(SUPPORT_INET4)
|
---|
| 816 |
|
---|
| 817 | syslog(LOG_NOTICE, "[RSLV] reslv: type: %s, server: %s.%d.",
|
---|
| 818 | dns_flag_qtype(flags),
|
---|
| 819 | ip2str(NULL, &in4_addr_dns),
|
---|
| 820 | RSLV_CFG_DNS_PORTNO);
|
---|
| 821 |
|
---|
| 822 | #endif /* of #if defined(SUPPORT_INET4) */
|
---|
| 823 |
|
---|
| 824 | #endif /* of #if defined(SUPPORT_INET6) */
|
---|
| 825 |
|
---|
| 826 | }
|
---|
| 827 | return length;
|
---|
| 828 | }
|
---|
| 829 | }
|
---|
| 830 |
|
---|
| 831 | #if defined(SUPPORT_INET6) && defined(SUPPORT_INET4)
|
---|
| 832 |
|
---|
| 833 | /*
|
---|
| 834 | * udp64_dns -- DNS/IPv6ãDNS/IPv4 ã«ãã DNS ãµã¼ãããã¡ãã»ã¼ã¸ãåä¿¡ããã
|
---|
| 835 | */
|
---|
| 836 |
|
---|
| 837 | static ER_UINT
|
---|
| 838 | udp64_dns (uint16_t flags, char *hostname, uint8_t *msg,
|
---|
| 839 | uint_t msg_size, T_RSLV_DNS_MSG *rslv)
|
---|
| 840 | {
|
---|
| 841 | ER_UINT length;
|
---|
| 842 | ER error;
|
---|
| 843 | uint16_t proto;
|
---|
| 844 |
|
---|
| 845 | /* DNS ã¡ãã»ã¼ã¸ãä½æããã*/
|
---|
| 846 | if ((length = setup_dns_msg(flags, hostname, msg, msg_size)) < 0)
|
---|
| 847 | return length;
|
---|
| 848 |
|
---|
| 849 | /* UDP/IPv6 ã® DNS ãµã¼ãã«ç
|
---|
| 850 | §ä¼ããã*/
|
---|
| 851 | proto = DNS_LUP_FLAGS_PROTO_IPV6;
|
---|
| 852 | if ((length = udp6_dns(flags, &in6_addr_dns, msg, msg_size, length)) < 0) {
|
---|
| 853 | /* UDP/IPv6 ã® DNS ãµã¼ãã¸ã®ç
|
---|
| 854 | §ä¼ãã¨ã©ã¼ã«ãªã£ãæã¯ãUDP/IPv4 ã® DNS ãµã¼ãã«ç
|
---|
| 855 | §ä¼ããã*/
|
---|
| 856 | if ((length = setup_dns_msg(flags, hostname, msg, msg_size)) < 0)
|
---|
| 857 | return length;
|
---|
| 858 |
|
---|
| 859 | /* UDP/IPv4 ã® DNS ãµã¼ãã«ç
|
---|
| 860 | §ä¼ããã*/
|
---|
| 861 | proto = DNS_LUP_FLAGS_PROTO_IPV4;
|
---|
| 862 | if ((length = udp4_dns(flags, &in4_addr_dns, msg, msg_size, length)) < 0)
|
---|
| 863 | return length;
|
---|
| 864 | }
|
---|
| 865 |
|
---|
| 866 | /* DNS ã¡ãã»ã¼ã¸ã解æããã*/
|
---|
| 867 | if ((error = analyze_dns_msg(msg, length, rslv)) != E_OK)
|
---|
| 868 | return error;
|
---|
| 869 | else {
|
---|
| 870 | if ((rslv->dns_hdr.ancount > 0) && (flags & DNS_LUP_FLAGS_MSG)) {
|
---|
| 871 | if (proto & DNS_LUP_FLAGS_PROTO_IPV6) {
|
---|
| 872 | syslog(LOG_NOTICE, "[RSLV] reslv: type: %s, server: %s.%d.",
|
---|
| 873 | dns_flag_qtype(flags),
|
---|
| 874 | ipv62str(NULL, &in6_addr_dns),
|
---|
| 875 | RSLV_CFG_DNS_PORTNO);
|
---|
| 876 | }
|
---|
| 877 | else {
|
---|
| 878 | syslog(LOG_NOTICE, "[RSLV] reslv: type: %s, server: %s.%d.",
|
---|
| 879 | dns_flag_qtype(flags),
|
---|
| 880 | ip2str(NULL, &in4_addr_dns),
|
---|
| 881 | RSLV_CFG_DNS_PORTNO);
|
---|
| 882 | }
|
---|
| 883 | }
|
---|
| 884 | return length;
|
---|
| 885 | }
|
---|
| 886 | }
|
---|
| 887 |
|
---|
| 888 | #endif /* of #if defined(SUPPORT_INET6) && defined(SUPPORT_INET4) */
|
---|
| 889 |
|
---|
| 890 | /*
|
---|
| 891 | * dns_lookup_host -- DNS ã«ãããã¹ãã®æ
|
---|
| 892 | å ±ãåå¾ããã
|
---|
| 893 | */
|
---|
| 894 |
|
---|
| 895 | ER_UINT
|
---|
| 896 | dns_lookup_host (uint16_t flags, char *hostname, uint8_t *msg,
|
---|
| 897 | uint_t msg_size, T_RSLV_DNS_MSG *rslv)
|
---|
| 898 | {
|
---|
| 899 | ER error;
|
---|
| 900 |
|
---|
| 901 | #if defined(SUPPORT_INET6) && defined(SUPPORT_INET4)
|
---|
| 902 |
|
---|
| 903 | if ((flags & DNS_LUP_FLAGS_PROTO_MASK) == (DNS_LUP_FLAGS_PROTO_IPV6 | DNS_LUP_FLAGS_PROTO_IPV4)) {
|
---|
| 904 |
|
---|
| 905 | /*
|
---|
| 906 | * IPv6/IPv4 ã®ä¸¡æ¹ãæå®ãããæã®å¦ç
|
---|
| 907 | * ã¾ã type == AAAA 㧠DNS ãµã¼ãã«ç
|
---|
| 908 | §ä¼ããã
|
---|
| 909 | */
|
---|
| 910 | if (flags & DNS_LUP_FLAGS_QTYPE_PTR) {
|
---|
| 911 | if ((error = udp64_dns(flags, hostname, msg, msg_size, rslv)) < 0)
|
---|
| 912 | return error;
|
---|
| 913 | }
|
---|
| 914 | else if (flags & DNS_LUP_FLAGS_QTYPE_AAAA) {
|
---|
| 915 | if ((error = udp64_dns(flags & ~DNS_LUP_FLAGS_QTYPE_A, hostname, msg, msg_size, rslv)) < 0)
|
---|
| 916 | return error;
|
---|
| 917 | }
|
---|
| 918 | else {
|
---|
| 919 | HOST2MSG16(rslv->dns_hdr.ancount, 0);
|
---|
| 920 | error = E_OK;
|
---|
| 921 | }
|
---|
| 922 |
|
---|
| 923 | if (rslv->dns_hdr.ancount == 0) {
|
---|
| 924 |
|
---|
| 925 | /*
|
---|
| 926 | * type == AAAA ã§ã¢ãã¬ã¹è§£æ±ºãã§ããªãã£ãæã®å¦ç
|
---|
| 927 | * type == A 㧠DNS ãµã¼ãã«ç
|
---|
| 928 | §ä¼ããã
|
---|
| 929 | */
|
---|
| 930 | if (flags & DNS_LUP_FLAGS_QTYPE_A)
|
---|
| 931 | return udp64_dns(flags & ~DNS_LUP_FLAGS_QTYPE_AAAA, hostname, msg, msg_size, rslv);
|
---|
| 932 | else {
|
---|
| 933 | syslog(LOG_NOTICE, "[RSLV] unknown query type: %04x.", flags & DNS_LUP_FLAGS_QTYPE_MASK);
|
---|
| 934 | return E_PAR;
|
---|
| 935 | }
|
---|
| 936 | }
|
---|
| 937 | else
|
---|
| 938 | return error;
|
---|
| 939 | }
|
---|
| 940 |
|
---|
| 941 | if ((flags & DNS_LUP_FLAGS_QTYPE_MASK) == (DNS_LUP_FLAGS_QTYPE_AAAA | DNS_LUP_FLAGS_QTYPE_A)) {
|
---|
| 942 |
|
---|
| 943 | /*
|
---|
| 944 | * type == AAAA 㨠A ã®ä¸¡æ¹ãæå®ãããæã®å¦ç
|
---|
| 945 | * ã¾ã type == AAAA 㧠DNS ãµã¼ãã«ç
|
---|
| 946 | §ä¼ããã
|
---|
| 947 | */
|
---|
| 948 | if ((error = dns_lookup_host_sub(flags & ~DNS_LUP_FLAGS_QTYPE_A, hostname, msg, msg_size, rslv)) < 0)
|
---|
| 949 | return error;
|
---|
| 950 |
|
---|
| 951 | if (rslv->dns_hdr.ancount == 0) {
|
---|
| 952 |
|
---|
| 953 | /*
|
---|
| 954 | * type == AAAA ã§ã¢ãã¬ã¹è§£æ±ºãã§ããªãã£ãæã®å¦ç
|
---|
| 955 | * type == A 㧠DNS ãµã¼ãã«ç
|
---|
| 956 | §ä¼ããã
|
---|
| 957 | */
|
---|
| 958 | return dns_lookup_host_sub(flags & ~DNS_LUP_FLAGS_QTYPE_AAAA, hostname, msg, msg_size, rslv);
|
---|
| 959 | }
|
---|
| 960 | #if 0
|
---|
| 961 | else {
|
---|
| 962 | syslog(LOG_NOTICE, "[RSLV] unknown query type: %04x.", flags & DNS_LUP_FLAGS_QTYPE_MASK);
|
---|
| 963 | return E_PAR;
|
---|
| 964 | }
|
---|
| 965 | #endif
|
---|
| 966 | }
|
---|
| 967 |
|
---|
| 968 | else {
|
---|
| 969 | /* IPv6/IPv4 ã®ã©ã¡ããä¸æ¹ãæå®ãããæã®å¦ç */
|
---|
| 970 | error = dns_lookup_host_sub(flags, hostname, msg, msg_size, rslv);
|
---|
| 971 | }
|
---|
| 972 |
|
---|
| 973 | #else /* of #if defined(SUPPORT_INET6) && defined(SUPPORT_INET4) */
|
---|
| 974 |
|
---|
| 975 | error = dns_lookup_host_sub(flags, hostname, msg, msg_size, rslv);
|
---|
| 976 |
|
---|
| 977 | #endif /* of #if defined(SUPPORT_INET6) && defined(SUPPORT_INET4) */
|
---|
| 978 |
|
---|
| 979 | return error;
|
---|
| 980 | }
|
---|
| 981 |
|
---|
| 982 | #if defined(SUPPORT_INET6)
|
---|
| 983 |
|
---|
| 984 | /*
|
---|
| 985 | * dns_in6_set_dname -- DNS ã® ãã¡ã¤ã³åãè¨å®ããï¼DHCPv6ç¨ï¼ã
|
---|
| 986 | *
|
---|
| 987 | * 注æ: new ã« NULL ãæå®ããã¨ãåæå¤ã«æ»ãã
|
---|
| 988 | */
|
---|
| 989 |
|
---|
| 990 | const uint8_t *
|
---|
| 991 | dns_in6_set_dname (const uint8_t *new, uint_t len)
|
---|
| 992 | {
|
---|
| 993 | uint8_t *dst;
|
---|
| 994 | int label_len, name_len = DNS_NAME_LENGTH;
|
---|
| 995 |
|
---|
| 996 | if (new == NULL)
|
---|
| 997 | strcpy(dns_domain_name, RSLV_CFG_DNS_DOMAIN_NAME_STR);
|
---|
| 998 | else {
|
---|
| 999 | dst = dns_domain_name;
|
---|
| 1000 | while ((*new != 0) && (name_len > 0) && (len > 0)) {
|
---|
| 1001 | label_len = *new ++;
|
---|
| 1002 | len --;
|
---|
| 1003 | while ((name_len > 0) && (len > 0) && (label_len > 0)) {
|
---|
| 1004 | *dst ++ = *new ++;
|
---|
| 1005 | name_len --;
|
---|
| 1006 | len --;
|
---|
| 1007 | label_len --;
|
---|
| 1008 | }
|
---|
| 1009 | if ((*new != 0) && (name_len > 0)) {
|
---|
| 1010 | *dst ++ = '.';
|
---|
| 1011 | name_len --;
|
---|
| 1012 | }
|
---|
| 1013 | }
|
---|
| 1014 | *dst = '\0';
|
---|
| 1015 | }
|
---|
| 1016 | return dns_domain_name;
|
---|
| 1017 | }
|
---|
| 1018 |
|
---|
| 1019 | /*
|
---|
| 1020 | * dns_in6_get_dname -- DNS ã® ãã¡ã¤ã³åãå¾ãã
|
---|
| 1021 | */
|
---|
| 1022 |
|
---|
| 1023 | const uint8_t *
|
---|
| 1024 | dns_in6_get_dname (void)
|
---|
| 1025 | {
|
---|
| 1026 | return dns_domain_name;
|
---|
| 1027 | }
|
---|
| 1028 |
|
---|
| 1029 | /*
|
---|
| 1030 | * dns_in6_set_addr -- DNS ãµã¼ãã® IPv6 ã¢ãã¬ã¹ãè¨å®ããï¼DHCPv6ç¨ï¼ã
|
---|
| 1031 | *
|
---|
| 1032 | * 注æ: new ã« NULL ãæå®ããã¨ãåæå¤ã«æ»ãã
|
---|
| 1033 | */
|
---|
| 1034 |
|
---|
| 1035 | T_IN6_ADDR *
|
---|
| 1036 | dns_in6_set_addr (T_IN6_ADDR *new)
|
---|
| 1037 | {
|
---|
| 1038 | if (new == NULL)
|
---|
| 1039 | in6_addr_dns = in6_addr_dns_init;
|
---|
| 1040 | else
|
---|
| 1041 | in6_addr_dns = *new;
|
---|
| 1042 | return &in6_addr_dns;
|
---|
| 1043 | }
|
---|
| 1044 |
|
---|
| 1045 | /*
|
---|
| 1046 | * dns_in6_get_addr -- DNS ãµã¼ãã® IPv6 ã¢ãã¬ã¹ãå¾ãã
|
---|
| 1047 | */
|
---|
| 1048 |
|
---|
| 1049 | T_IN6_ADDR *
|
---|
| 1050 | dns_in6_get_addr (T_IN6_ADDR *dst)
|
---|
| 1051 | {
|
---|
| 1052 | if (dst == NULL)
|
---|
| 1053 | return NULL;
|
---|
| 1054 | else {
|
---|
| 1055 | *dst = in6_addr_dns;
|
---|
| 1056 | return dst;
|
---|
| 1057 | }
|
---|
| 1058 | }
|
---|
| 1059 |
|
---|
| 1060 | #endif /* of #if defined(SUPPORT_INET6) */
|
---|
| 1061 |
|
---|
| 1062 | #if defined(SUPPORT_INET4)
|
---|
| 1063 |
|
---|
| 1064 | /*
|
---|
| 1065 | * dns_in4_set_dname -- DNS ã® ãã¡ã¤ã³åãè¨å®ããï¼DHCPv4ç¨ï¼ã
|
---|
| 1066 | *
|
---|
| 1067 | * 注æ: new ã« NULL ãæå®ããã¨ãåæå¤ã«æ»ãã
|
---|
| 1068 | */
|
---|
| 1069 |
|
---|
| 1070 | const uint8_t *
|
---|
| 1071 | dns_in4_set_dname (const uint8_t *new, uint_t len)
|
---|
| 1072 | {
|
---|
| 1073 | uint8_t *dst;
|
---|
| 1074 | int name_len = DNS_NAME_LENGTH;
|
---|
| 1075 |
|
---|
| 1076 | if (new == NULL)
|
---|
| 1077 | strcpy(dns_domain_name, RSLV_CFG_DNS_DOMAIN_NAME_STR);
|
---|
| 1078 | else {
|
---|
| 1079 | dst = dns_domain_name;
|
---|
| 1080 | while ((name_len -- > 0) && (len -- > 0) && *new)
|
---|
| 1081 | *dst ++ = *new ++;
|
---|
| 1082 | *dst = '\0';
|
---|
| 1083 | }
|
---|
| 1084 | return dns_domain_name;
|
---|
| 1085 | }
|
---|
| 1086 |
|
---|
| 1087 | /*
|
---|
| 1088 | * dns_in4_get_dname -- DNS ã® ãã¡ã¤ã³åãå¾ãã
|
---|
| 1089 | */
|
---|
| 1090 |
|
---|
| 1091 | const uint8_t *
|
---|
| 1092 | dns_in4_get_dname (void)
|
---|
| 1093 | {
|
---|
| 1094 | return dns_domain_name;
|
---|
| 1095 | }
|
---|
| 1096 |
|
---|
| 1097 | /*
|
---|
| 1098 | * dns_in4_set_addr -- DNS ãµã¼ãã® IPv4 ã¢ãã¬ã¹ãè¨å®ããï¼DHCPv4ç¨ï¼ã
|
---|
| 1099 | *
|
---|
| 1100 | * 注æ: new ã« NULL ãæå®ããã¨ãåæå¤ã«æ»ãã
|
---|
| 1101 | */
|
---|
| 1102 |
|
---|
| 1103 | T_IN4_ADDR *
|
---|
| 1104 | dns_in4_set_addr (T_IN4_ADDR *new)
|
---|
| 1105 | {
|
---|
| 1106 | if (new == NULL)
|
---|
| 1107 | in4_addr_dns = IPV4_ADDR_DNS;
|
---|
| 1108 | else
|
---|
| 1109 | in4_addr_dns = *new;
|
---|
| 1110 | return &in4_addr_dns;
|
---|
| 1111 | }
|
---|
| 1112 |
|
---|
| 1113 | /*
|
---|
| 1114 | * dns_in4_get_addr -- DNS ãµã¼ãã® IPv4 ã¢ãã¬ã¹ãå¾ãã
|
---|
| 1115 | */
|
---|
| 1116 |
|
---|
| 1117 | T_IN4_ADDR *
|
---|
| 1118 | dns_in4_get_addr (T_IN4_ADDR *dst)
|
---|
| 1119 | {
|
---|
| 1120 | if (dst == NULL)
|
---|
| 1121 | return NULL;
|
---|
| 1122 | else {
|
---|
| 1123 | *dst = in4_addr_dns;
|
---|
| 1124 | return dst;
|
---|
| 1125 | }
|
---|
| 1126 | }
|
---|
| 1127 |
|
---|
| 1128 | #endif /* of #if defined(SUPPORT_INET4) */
|
---|
| 1129 |
|
---|
| 1130 | /*
|
---|
| 1131 | * dns_host_addr -- ãã¹ãåã IP ã¢ãã¬ã¹ã«å¤æããã
|
---|
| 1132 | */
|
---|
| 1133 |
|
---|
| 1134 | ER
|
---|
| 1135 | dns_host_addr (uint16_t flags, char *hostname, T_IN_ADDR *addr)
|
---|
| 1136 | {
|
---|
| 1137 | T_RSLV_DNS_MSG rslv;
|
---|
| 1138 | T_RSLV_RR rr;
|
---|
| 1139 | ER_UINT length, offset;
|
---|
| 1140 | ER error = E_OK;
|
---|
| 1141 | int scount;
|
---|
| 1142 | uint8_t *msg;
|
---|
| 1143 |
|
---|
| 1144 | #if defined(SUPPORT_INET6) && defined(SUPPORT_INET4)
|
---|
| 1145 |
|
---|
| 1146 | T_IN4_ADDR addr4;
|
---|
| 1147 |
|
---|
| 1148 | #endif /* of #if defined(SUPPORT_INET6) && defined(SUPPORT_INET4) */
|
---|
| 1149 |
|
---|
| 1150 | if ((error = tget_mpf(MPF_RSLV_SRBUF, (void*)&msg, TMO_FEVR)) != E_OK)
|
---|
| 1151 | return error;
|
---|
| 1152 |
|
---|
| 1153 | if ((length = dns_lookup_host(flags, hostname, msg, DNS_UDP_MSG_LENGTH, &rslv)) < 0) {
|
---|
| 1154 | error = length;
|
---|
| 1155 | goto err_ret;
|
---|
| 1156 | }
|
---|
| 1157 |
|
---|
| 1158 | offset = rslv.an_offset;
|
---|
| 1159 | for (scount = 1; scount <= rslv.dns_hdr.ancount; scount ++) {
|
---|
| 1160 | if ((offset = dns_analyze_rr(&rr, offset, msg, length)) < 0) {
|
---|
| 1161 | error = offset;
|
---|
| 1162 | goto err_ret;
|
---|
| 1163 | }
|
---|
| 1164 |
|
---|
| 1165 | #if defined(SUPPORT_INET6)
|
---|
| 1166 |
|
---|
| 1167 | if (rr.type == DNS_TYPE_AAAA && rr.class == DNS_CLASS_IN && rr.rdlength == sizeof(*addr)) {
|
---|
| 1168 | memcpy((void*)addr, (void*)(msg + rr.rdata_offset), sizeof(*addr));
|
---|
| 1169 | break;
|
---|
| 1170 | }
|
---|
| 1171 |
|
---|
| 1172 | #if defined(SUPPORT_INET4)
|
---|
| 1173 |
|
---|
| 1174 | if (rr.type == DNS_TYPE_A && rr.class == DNS_CLASS_IN && rr.rdlength == sizeof(addr4)) {
|
---|
| 1175 | addr4 = msg2host32(msg + rr.rdata_offset);
|
---|
| 1176 | in6_make_ipv4mapped(addr, addr4);
|
---|
| 1177 | break;
|
---|
| 1178 | }
|
---|
| 1179 |
|
---|
| 1180 | #endif /* of #if defined(SUPPORT_INET4) */
|
---|
| 1181 |
|
---|
| 1182 | #else /* of #if defined(SUPPORT_INET6) */
|
---|
| 1183 |
|
---|
| 1184 | #if defined(SUPPORT_INET4)
|
---|
| 1185 |
|
---|
| 1186 | if (rr.type == DNS_TYPE_A && rr.class == DNS_CLASS_IN && rr.rdlength == sizeof(*addr)) {
|
---|
| 1187 | *addr = msg2host32((msg + rr.rdata_offset));
|
---|
| 1188 | break;
|
---|
| 1189 | }
|
---|
| 1190 |
|
---|
| 1191 | #endif /* of #if defined(SUPPORT_INET4) */
|
---|
| 1192 |
|
---|
| 1193 | #endif /* of #if defined(SUPPORT_INET6) */
|
---|
| 1194 |
|
---|
| 1195 | }
|
---|
| 1196 | if (scount > rslv.dns_hdr.ancount)
|
---|
| 1197 | error = EV_RSLV_UNEXPCT;
|
---|
| 1198 |
|
---|
| 1199 | err_ret:
|
---|
| 1200 | rel_mpf(MPF_RSLV_SRBUF, (void*)msg);
|
---|
| 1201 | return error;
|
---|
| 1202 | }
|
---|
| 1203 |
|
---|
| 1204 | #endif /* of #if defined(USE_RESOLVER) */
|
---|