{"id":120875,"date":"2024-03-24T00:21:44","date_gmt":"2024-03-23T15:21:44","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%ab%e3%81%a6dht%e3%82%af%e3%83%ad%e3%83%bc%e3%83%a9%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%97%e3%80%81dht%e3%83%8d%e3%83%83%e3%83%88%e3%83%af%e3%83%bc%e3%82%af%e3%82%88%e3%82%8abt%e3%82%b7%e3%83%bc\/"},"modified":"2024-04-04T06:23:00","modified_gmt":"2024-04-03T21:23:00","slug":"c%e3%81%ab%e3%81%a6dht%e3%82%af%e3%83%ad%e3%83%bc%e3%83%a9%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%97%e3%80%81dht%e3%83%8d%e3%83%83%e3%83%88%e3%83%af%e3%83%bc%e3%82%af%e3%82%88%e3%82%8abt%e3%82%b7%e3%83%bc","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%ab%e3%81%a6dht%e3%82%af%e3%83%ad%e3%83%bc%e3%83%a9%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%97%e3%80%81dht%e3%83%8d%e3%83%83%e3%83%88%e3%83%af%e3%83%bc%e3%82%af%e3%82%88%e3%82%8abt%e3%82%b7%e3%83%bc\/","title":{"rendered":"C++\u306b\u3066DHT\u30af\u30ed\u30fc\u30e9\u3092\u5b9f\u88c5\u3057\u3001DHT\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3088\u308aBT\u30b7\u30fc\u30c9\u3092\u53ce\u96c6\u3059\u308b"},"content":{"rendered":"<p>\u4ee5\u4e0b\u306bC++\u3067\u66f8\u304b\u308c\u305f\u30b7\u30f3\u30d7\u30eb\u306aDHT\u30af\u30ed\u30fc\u30e9\u3092\u793a\u3057\u307e\u3059\u3002\u3053\u308c\u306fDHT\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304b\u3089BT\u30b7\u30fc\u30c9\u3092\u30af\u30ed\u30fc\u30eb\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;iostream&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;cstring&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;cstdlib&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;unistd.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;sys\/socket.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;netinet\/in.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;arpa\/inet.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;fcntl.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;vector&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">define<\/span> MAX_NODES 1000<\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">define<\/span> MAX_INFOHASHES 1000<\/span>\r\n<span class=\"hljs-comment\">\/\/ DHT\u8282\u70b9\u7ed3\u6784<\/span>\r\n<span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title class_\">Node<\/span> {\r\nstd::string ip;\r\n<span class=\"hljs-type\">int<\/span> port;\r\n};\r\n<span class=\"hljs-comment\">\/\/ \u4fe1\u606f\u6563\u5217\u503c\u7ed3\u6784<\/span>\r\n<span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title class_\">InfoHash<\/span> {\r\nstd::string hash;\r\n};\r\nstd::vector&lt;Node&gt; nodes;\r\nstd::vector&lt;InfoHash&gt; infoHashes;\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span> <\/span>{\r\n<span class=\"hljs-type\">int<\/span> sock = <span class=\"hljs-built_in\">socket<\/span>(AF_INET, SOCK_DGRAM, IPPROTO_UDP);\r\n<span class=\"hljs-keyword\">if<\/span> (sock &lt; <span class=\"hljs-number\">0<\/span>) {\r\nstd::cerr &lt;&lt; <span class=\"hljs-string\">\"Could not create socket.\"<\/span> &lt;&lt; std::endl;\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n}\r\nsockaddr_in bindAddr{};\r\nbindAddr.sin_family = AF_INET;\r\nbindAddr.sin_port = <span class=\"hljs-built_in\">htons<\/span>(<span class=\"hljs-number\">6881<\/span>);\r\nbindAddr.sin_addr.s_addr = <span class=\"hljs-built_in\">htonl<\/span>(INADDR_ANY);\r\n<span class=\"hljs-keyword\">if<\/span> (<span class=\"hljs-built_in\">bind<\/span>(sock, (<span class=\"hljs-keyword\">struct<\/span> sockaddr *) &amp;bindAddr, <span class=\"hljs-built_in\">sizeof<\/span>(bindAddr)) &lt; <span class=\"hljs-number\">0<\/span>) {\r\nstd::cerr &lt;&lt; <span class=\"hljs-string\">\"Could not bind socket.\"<\/span> &lt;&lt; std::endl;\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u52a0\u5165DHT\u7f51\u7edc<\/span>\r\nsockaddr_in dhtAddr{};\r\ndhtAddr.sin_family = AF_INET;\r\ndhtAddr.sin_port = <span class=\"hljs-built_in\">htons<\/span>(<span class=\"hljs-number\">6881<\/span>);\r\n<span class=\"hljs-built_in\">inet_pton<\/span>(AF_INET, <span class=\"hljs-string\">\"router.bittorrent.com\"<\/span>, &amp;(dhtAddr.sin_addr));\r\n<span class=\"hljs-type\">char<\/span> joinMsg[] = <span class=\"hljs-string\">\"d1:ad2:id20:abcdefghij01234567896:target20:mnopqrstuvwxyz123456e1:q4:ping1:t2:aa1:y1:qe\"<\/span>;\r\n<span class=\"hljs-built_in\">sendto<\/span>(sock, joinMsg, <span class=\"hljs-built_in\">strlen<\/span>(joinMsg), <span class=\"hljs-number\">0<\/span>, (<span class=\"hljs-keyword\">struct<\/span> sockaddr *) &amp;dhtAddr, <span class=\"hljs-built_in\">sizeof<\/span>(dhtAddr));\r\n<span class=\"hljs-type\">char<\/span> buffer[<span class=\"hljs-number\">4096<\/span>];\r\n<span class=\"hljs-keyword\">while<\/span> (<span class=\"hljs-literal\">true<\/span>) {\r\n<span class=\"hljs-type\">ssize_t<\/span> len = <span class=\"hljs-built_in\">recv<\/span>(sock, buffer, <span class=\"hljs-built_in\">sizeof<\/span>(buffer) - <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">0<\/span>);\r\n<span class=\"hljs-keyword\">if<\/span> (len &lt;= <span class=\"hljs-number\">0<\/span>) {\r\n<span class=\"hljs-keyword\">break<\/span>;\r\n}\r\nbuffer[len] = <span class=\"hljs-string\">'\\0'<\/span>;\r\n<span class=\"hljs-comment\">\/\/ \u5904\u7406\u63a5\u6536\u5230\u7684\u6570\u636e<\/span>\r\n<span class=\"hljs-comment\">\/\/ \u63d0\u53d6\u8282\u70b9\u4fe1\u606f<\/span>\r\n<span class=\"hljs-type\">char<\/span> *token = <span class=\"hljs-built_in\">strtok<\/span>(buffer, <span class=\"hljs-string\">\"d1:rd2:id20:\"<\/span>);\r\n<span class=\"hljs-keyword\">if<\/span> (token != <span class=\"hljs-literal\">nullptr<\/span>) {\r\ntoken += <span class=\"hljs-number\">20<\/span>;\r\nnodes.<span class=\"hljs-built_in\">push_back<\/span>({std::<span class=\"hljs-built_in\">string<\/span>(token, token + <span class=\"hljs-number\">20<\/span>), <span class=\"hljs-built_in\">ntohs<\/span>(dhtAddr.sin_port)});\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u63d0\u53d6\u79cd\u5b50\u4fe1\u606f\u6563\u5217\u503c<\/span>\r\ntoken = <span class=\"hljs-built_in\">strtok<\/span>(<span class=\"hljs-literal\">nullptr<\/span>, <span class=\"hljs-string\">\"5:token\"<\/span>);\r\n<span class=\"hljs-keyword\">if<\/span> (token != <span class=\"hljs-literal\">nullptr<\/span>) {\r\ntoken += <span class=\"hljs-number\">6<\/span>;\r\n<span class=\"hljs-type\">char<\/span> *end = <span class=\"hljs-built_in\">strchr<\/span>(token, <span class=\"hljs-string\">':'<\/span>);\r\n<span class=\"hljs-keyword\">if<\/span> (end != <span class=\"hljs-literal\">nullptr<\/span>) {\r\ninfoHashes.<span class=\"hljs-built_in\">push_back<\/span>({std::<span class=\"hljs-built_in\">string<\/span>(token, end)});\r\n}\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u53d1\u9001PING\u6d88\u606f\u4ee5\u4fdd\u6301\u8fde\u63a5<\/span>\r\n<span class=\"hljs-type\">char<\/span> pingMsg[] = <span class=\"hljs-string\">\"d1:ad2:id20:abcdefghij01234567896:target20:mnopqrstuvwxyz123456e1:q4:ping1:t2:aa1:y1:qe\"<\/span>;\r\n<span class=\"hljs-built_in\">sendto<\/span>(sock, pingMsg, <span class=\"hljs-built_in\">strlen<\/span>(pingMsg), <span class=\"hljs-number\">0<\/span>, (<span class=\"hljs-keyword\">struct<\/span> sockaddr *) &amp;dhtAddr, <span class=\"hljs-built_in\">sizeof<\/span>(dhtAddr));\r\n}\r\n<span class=\"hljs-built_in\">close<\/span>(sock);\r\n<span class=\"hljs-comment\">\/\/ \u8f93\u51fa\u83b7\u53d6\u5230\u7684\u8282\u70b9\u4fe1\u606f\u548c\u79cd\u5b50\u4fe1\u606f\u6563\u5217\u503c<\/span>\r\nstd::cout &lt;&lt; <span class=\"hljs-string\">\"Nodes:\"<\/span> &lt;&lt; std::endl;\r\n<span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">const<\/span> <span class=\"hljs-keyword\">auto<\/span> &amp;node : nodes) {\r\nstd::cout &lt;&lt; node.ip &lt;&lt; <span class=\"hljs-string\">\":\"<\/span> &lt;&lt; node.port &lt;&lt; std::endl;\r\n}\r\nstd::cout &lt;&lt; <span class=\"hljs-string\">\"Info Hashes:\"<\/span> &lt;&lt; std::endl;\r\n<span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">const<\/span> <span class=\"hljs-keyword\">auto<\/span> &amp;infoHash : infoHashes) {\r\nstd::cout &lt;&lt; infoHash.hash &lt;&lt; std::endl;\r\n}\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u30b9\u30cb\u30da\u30c3\u30c8\u3067\u306f\u3001\u57fa\u790e\u7684\u306a UDP \u30bd\u30b1\u30c3\u30c8\u64cd\u4f5c\u3092\u7528\u3044\u3066 DHT \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3068\u306e\u901a\u4fe1\u3092\u884c\u3044\u307e\u3059\u3002\u6700\u521d\u306b\u3001\u30bd\u30b1\u30c3\u30c8\u3092\u4f5c\u6210\u3057\u3066\u30ed\u30fc\u30ab\u30eb\u30dd\u30fc\u30c8 6881 \u306b\u30d0\u30a4\u30f3\u30c9\u3057\u307e\u3059\u3002\u6b21\u306b\u3001DHT \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u65e2\u77e5\u306e\u30eb\u30fc\u30bf\u30fc\u306b\u3001DHT \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u53c2\u52a0\u3059\u308b\u305f\u3081\u306e JOIN \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001DHT \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304b\u3089\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u7d99\u7d9a\u7684\u306b\u53d7\u4fe1\u3057\u3001\u3053\u308c\u3089\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u89e3\u6790\u3057\u3066\u30ce\u30fc\u30c9\u60c5\u5831\u3068\u30b7\u30fc\u30c9\u60c5\u5831\u30cf\u30c3\u30b7\u30e5\u5024\u3092\u62bd\u51fa\u3057\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001\u30bd\u30b1\u30c3\u30c8\u3092\u9589\u3058\u3066\u3001\u53d6\u5f97\u3057\u305f\u30ce\u30fc\u30c9\u60c5\u5831\u3068\u30b7\u30fc\u30c9\u60c5\u5831\u30cf\u30c3\u30b7\u30e5\u5024\u3092\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n<p>\u3042\u304f\u307e\u3067\u30b5\u30f3\u30d7\u30eb\u306a\u306e\u3067\u3001\u5927\u91cf\u306eBT\u79cd\u5b50\u3092\u53d6\u5f97\u3059\u308b\u306b\u306f\u3001\u5b9f\u969b\u306b\u306f\u3082\u3063\u3068\u8907\u96d1\u306a\u51e6\u7406\u304c\u5fc5\u8981\u3068\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ee5\u4e0b\u306bC++\u3067\u66f8\u304b\u308c\u305f\u30b7\u30f3\u30d7\u30eb\u306aDHT\u30af\u30ed\u30fc\u30e9\u3092\u793a\u3057\u307e\u3059\u3002\u3053\u308c\u306fDHT\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304b\u3089BT\u30b7\u30fc\u30c9\u3092\u30af\u30ed\u30fc\u30eb\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3059\u3002 #include &lt;iostream&gt; #include &lt;cstring [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-120875","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C++\u306b\u3066DHT\u30af\u30ed\u30fc\u30e9\u3092\u5b9f\u88c5\u3057\u3001DHT\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3088\u308aBT\u30b7\u30fc\u30c9\u3092\u53ce\u96c6\u3059\u308b - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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