{"id":213,"date":"2018-04-21T10:07:50","date_gmt":"2018-04-21T02:07:50","guid":{"rendered":"http:\/\/www.kejidana.com\/?p=213"},"modified":"2018-04-21T10:07:50","modified_gmt":"2018-04-21T02:07:50","slug":"node-js%ef%bc%9adgram%e6%a8%a1%e5%9d%97%e5%ae%9e%e7%8e%b0udp%e9%80%9a%e4%bf%a1","status":"publish","type":"post","link":"http:\/\/www.kejidana.com\/?p=213","title":{"rendered":"Node.js\uff1adgram\u6a21\u5757\u5b9e\u73b0UDP\u901a\u4fe1"},"content":{"rendered":"<div id=\"cnblogs_post_body\" class=\"blogpost-body cnblogs-markdown\">\n<h3 id=\"\u4ec0\u4e48\u662fudp\">1\u3001\u4ec0\u4e48\u662fUDP?<\/h3>\n<p>\u8fd9\u91cc\u7b80\u5355\u4ecb\u7ecd\u4e0b\uff0cUDP\uff0c\u5373\u7528\u6237\u6570\u636e\u62a5\u534f\u8bae\uff0c\u4e00\u79cd\u9762\u5411\u65e0\u8fde\u63a5\u7684\u4f20\u8f93\u5c42\u534f\u8bae\uff0c\u63d0\u4f9b\u4e0d\u53ef\u9760\u7684\u6d88\u606f\u4f20\u9001\u670d\u52a1\u3002UDP\u534f\u8bae\u4f7f\u7528\u7aef\u53e3\u53f7\u4e3a\u4e0d\u540c\u7684\u5e94\u7528\u4fdd\u7559\u5176\u5404\u81ea\u7684\u6570\u636e\u4f20\u8f93\u901a\u9053\uff0c\u8fd9\u4e00\u70b9\u975e\u5e38\u91cd\u8981\u3002\u4e0eTCP\u76f8\u6bd4\uff0c\u5360\u7528\u8d44\u6e90\u66f4\u5c11\uff0c\u4f20\u8f93\u901f\u5ea6\u66f4\u5feb\u3002<\/p>\n<h3 id=\"\u4e86\u89e3udp\u5355\u64ad\u5e7f\u64ad\u548c\u7ec4\u64ad\">2\u3001\u4e86\u89e3UDP\u5355\u64ad\u3001\u5e7f\u64ad\u548c\u7ec4\u64ad<\/h3>\n<p><strong>\u5355\u64ad<\/strong>\uff1a\u5411\u4e00\u4e2a\u5355\u64ad\u5730\u5740\u53d1\u9001UDP\u6570\u636e\u62a5\u65f6\uff0c\u6570\u636e\u62a5\u53ea\u80fd\u88ab\u6307\u5b9a\u7684IP\u4e3b\u673a\u63a5\u6536\uff0c\u540c\u4e00\u5b50\u7f51\u4e0b\u7684\u5176\u5b83\u4e3b\u673a\u90fd\u4e0d\u4f1a\u63a5\u6536\u8be5\u6570\u636e\u62a5\u3002\u5355\u64ad\u8fc7\u7a0b\uff08\u5047\u8bbe\u5b50\u7f51\u5730\u5740\uff1a192.168.10\uff0c\u8be5\u5b50\u7f51\u4e0b\u6709\u4e24\u53f0\u4e3b\u673a\uff1a192.168.10.2\uff0c192.168.10.3\uff0c\u5411192.168.10.2\u53d1\u9001\u6570\u636e\u62a5\uff09<\/p>\n<ol>\n<li>\u5411\u4e3b\u673a192.168.10.2\u76848060\u7aef\u53e3\u53d1\u9001\u6570\u636e\u62a5\uff0c\u8be5IP\u6570\u636e\u62a5\u76ee\u6807IP\u5728\u4ee5\u592a\u7f51\u4e2d\u88abARP\u89e3\u6790\u6210MAC\u5730\u5740\uff0c\u7136\u540e\u5c06\u6b64MAC\u5730\u5740\u8bbe\u7f6e\u4e3a\u76ee\u6807\u5730\u5740\u53d1\u51fa\u53bb\u3002<\/li>\n<li>\u8be5\u5b50\u7f51\u4e0b\u7684\u4e3b\u673a\u4ee5\u592a\u7f51\u63a5\u53e3\u770b\u5230\u8be5\u6570\u636e\u5e27\u65f6\uff0c\u5bf9\u6bd4\u81ea\u5df1\u7684MAC\u5730\u5740\uff0c\u5982\u679c\u4e0d\u4e00\u6837\uff0c\u5219\u5ffd\u7565\u8be5\u6570\u636e\u5e27\u3002<\/li>\n<li>\u76f4\u5230192.168.10.2\u4e3b\u673a\u770b\u5230\u8be5\u6570\u636e\u5e27\u65f6\uff0c\u53d1\u73b0MAC\u4e00\u81f4\uff0c\u5219\u8bfb\u5165\u8be5\u6570\u636e\u5e27\uff0c\u7136\u540e\u5728IP\u5c42\u5bf9\u6bd4\u76ee\u6807IP\u548c\u672c\u673aIP\uff0c\u5728UDP\u5c42\u5bf9\u6bd4\u7aef\u53e3\u53f7\u662f\u5426\u4e00\u81f4\uff0c\u6700\u540e\u63a5\u6536\u8be5\u6570\u636e\u5e27\u3002<\/li>\n<\/ol>\n<p><strong>\u5e7f\u64ad<\/strong>\uff1a\u5411\u4e00\u4e2a\u5e7f\u64ad\u5730\u5740\u53d1\u9001UDP\u6570\u636e\u62a5\uff0c\u8be5\u5e7f\u64ad\u7f51\u7edc\u4e0b\u7684\u6240\u6709\u4e3b\u673a\u90fd\u4f1a\u53d7\u5230\u5f71\u54cd\uff0c\u4e3b\u673a\u6839\u636e\u7aef\u53e3\u53f7\u6765\u5224\u65ad\u662f\u5426\u4e22\u5f03\u8be5\u6570\u636e\u3002\u5e7f\u64ad\u8fc7\u7a0b\uff08\u5047\u8bbe\u5b50\u7f51\u5730\u5740\uff1a192.168.10\uff0c\u5219\u8be5\u7f51\u7edc\u7684\u5e7f\u64ad\u5730\u5740\u4e3a\uff1a192.168.10.255\uff0c\u8be5\u5b50\u7f51\u4e0b\u6709\u4e24\u53f0\u4e3b\u673a\uff1a192.168.10.2\uff0c192.168.10.3\uff0c\u5411192.168.10.255\u53d1\u9001\u6570\u636e\u62a5\uff09\uff1a<\/p>\n<ol>\n<li>\u5411192.168.10.255\u4e3b\u673a\u7aef\u53e3\u4e3a8060\u53d1\u9001\u6570\u636e\u62a5\uff0c\uff0c\u8be5IP\u6570\u636e\u62a5\u76ee\u6807IP\u5728\u4ee5\u592a\u7f51\u4e2d\u88abARP\u89e3\u6790\u6210MAC\u5730\u5740\uff0c\u7136\u540e\u5c06\u6b64MAC\u5730\u5740\u8bbe\u7f6e\u4e3a\u76ee\u6807\u5730\u5740\u53d1\u51fa\u53bb\u3002<\/li>\n<li>192.168.10.2\u548c192.168.10.3\u7684\u4e3b\u673a\u63a5\u53e3\u90fd\u4f1a\u548c\u6b64\u5e7f\u64ad\u5730\u5740\u5339\u914d\u6210\u529f\uff0c\u76f4\u5230\u8be5\u6570\u636e\u62a5\u8fdb\u5165\u4f20\u8f93\u5c42\u65f6\u6839\u636e\u7aef\u53e3\u662f\u5426\u5339\u914d\u5224\u65ad\u662f\u5426\u4e22\u5f03\u8be5\u6570\u636e,\u7aef\u53e3\u4e3a8060\u7684\u4f1a\u4fdd\u7559\u8be5\u6570\u636e\uff0c\u5426\u5219\u5c06\u6570\u636e\u4e22\u5f03\u3002<\/li>\n<\/ol>\n<p><strong>\u5e7f\u64ad<\/strong>\uff1a\u5411\u4e00\u4e2a\u7ec4\u64ad\u5730\u5740\u53d1\u9001UDP\u6570\u636e\u62a5\uff0c\u8be5\u7ec4\u7f51\u7edc\u4e0b\u7684\u6240\u6709\u4e3b\u673a\u90fd\u4f1a\u53d7\u5230\u5f71\u54cd\uff0c\u4e3b\u673a\u6839\u636e\u7aef\u53e3\u53f7\u6765\u5224\u65ad\u662f\u5426\u4e22\u5f03\u8be5\u6570\u636e\u3002\u7ec4\u64ad\u8fc7\u7a0b\u539f\u7406\u4e0e\u5e7f\u64ad\u7c7b\u4f3c\u3002<\/p>\n<h3 id=\"dgram\u6a21\u5757api\u4ecb\u7ecd\">3\u3001<code>dgram<\/code>\u6a21\u5757API\u4ecb\u7ecd<\/h3>\n<p>\u8be5\u6a21\u5757\u7528\u6765\u521b\u5efaUDP\u6570\u636e\u62a5socket\uff0c\u7ee7\u627f\u4e86EventEmitter\uff0c\u8be5\u6a21\u5757\u7684API\u5982\u4e0b\u6240\u793a\uff1a<br \/>\n<a href=\"http:\/\/www.kejidana.com\/wp-content\/uploads\/2018\/04\/udp.png\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.kejidana.com\/wp-content\/uploads\/2018\/04\/udp.png\" alt=\"\" class=\"alignnone size-full wp-image-214\" width=\"615\" height=\"478\" \/><\/a><\/p>\n<h3 id=\"udp\u5355\u64ad\u5b9e\u73b0\">3\u3001UDP\u5355\u64ad\u5b9e\u73b0<\/h3>\n<p>\u5355\u64ad\u7684\u539f\u7406\u4e0a\u9762\u5df2\u7ecf\u8bf4\u4e86\uff0c\u8fd9\u91cc\u4fbf\u4e0d\u518d\u53d9\u8ff0\u3002<br \/>\n\u670d\u52a1\u7aef\uff1a<\/p>\n<pre class=\"lang:default decode:true \">const dgram = require('dgram');\nconst server = dgram.createSocket('udp4');\n\nserver.on('close',()=&gt;{\n    console.log('socket\u5df2\u5173\u95ed');\n});\n\nserver.on('error',(err)=&gt;{\n    console.log(err);\n});\n\nserver.on('listening',()=&gt;{\n    console.log('socket\u6b63\u5728\u76d1\u542c\u4e2d...');\n});\n\nserver.on('message',(msg,rinfo)=&gt;{\n    console.log(`receive message from ${rinfo.address}:${rinfo.port}`);\n    server.send('exit',rinfo.port,rinfo.address)\n});\n\nserver.bind('8060');<\/pre>\n<p>\u5ba2\u6237\u7aef\uff1a<\/p>\n<pre class=\"lang:default decode:true \">const dgram = require('dgram');\nconst client = dgram.createSocket('udp4');\n\nclient.on('close',()=&gt;{\n    console.log('socket\u5df2\u5173\u95ed');\n});\n\nclient.on('error',(err)=&gt;{\n    console.log(err);\n});\nclient.on('message',(msg,rinfo)=&gt;{\n    if(msg=='exit') client.close();\n    console.log(`receive message from ${rinfo.address}:${rinfo.port}`);\n});\nclient.send(`hello`,8060,'1.1.1.69');<\/pre>\n<p>&nbsp;<\/p>\n<h3 id=\"udp\u5e7f\u64ad\u5b9e\u73b0\">3\u3001UDP\u5e7f\u64ad\u5b9e\u73b0<\/h3>\n<p>\u8981\u5b9e\u73b0UDP\u5e7f\u64ad\uff0c\u5c31\u5fc5\u987b\u77e5\u9053\u5e7f\u64ad\u5730\u5740\uff0c\u5e7f\u64ad\u5730\u5740\u5982\u4f55\u8ba1\u7b97\u5462\uff1f\u53ef\u4ee5\u5229\u7528<code>ipconfig(windows)<\/code>\u6216<code>ifconfig(*unix)<\/code>\u5f97\u5230ip\u5730\u5740\u548cmask\u63a9\u7801\u5730\u5740\uff0c\u7136\u540e\u5229\u7528ip\u5730\u5740\u4e0emask\u5b50\u7f51\u63a9\u7801\u505a\u4e0e\u64cd\u4f5c\u5f97\u5230\u7f51\u7edc\u5730\u5740\uff0c\u7f51\u7edc\u5730\u5740\u4e2d\u4e3b\u673a\u4f4d\u90fd\u4e3a1\u5c31\u662f\u5e7f\u64ad\u5730\u5740\uff0c\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<div class=\"sourceCode\">\n<pre class=\"lang:default decode:true \">IP:149.88.160.58\nmask:11111111.11111111.11000000.00000000\nIP&amp;MASK\u5f97\u5230\u7f51\u7edc\u5730\u5740\uff1a149.88.128.0\/18\n\u7f51\u7edc\u53f7\u5c31\u662f\u4e3b\u673a\u4f4d\u5168\u4e3a0,\u5373149.88.10000000.00000000 \u5373149.88.128.0\n\u5e7f\u64ad\u5730\u5740\u5c31\u662f\u4e3b\u673a\u4f4d\u5168\u4e3a1,\u5373149.88.10111111.11111111\u5373149.88.191.255<\/pre>\n<p>&nbsp;<\/p>\n<\/div>\n<p>\u63a5\u7740\u5b9e\u73b0UDP\u5e7f\u64ad\uff0c\u6211\u673a\u5b50\u7684IP\u4e3a1.1.1.69\uff0c\u63a9\u7801\u4e3a255.255.255.0\uff0c\u56e0\u6b64\u5e7f\u64ad\u5730\u5740\u4e3a1.1.1.255\uff0c\u670d\u52a1\u7aef\u5411\u5e7f\u64ad\u5730\u5740\u76848061\u7aef\u53e3\u53d1\u9001\u6570\u636e\u62a5\uff0c\u5ba2\u6237\u7aef\u7ed1\u5b9a\u672c\u673a\u76848061\u7aef\u53e3\uff0c\u5982\u4e0b\u6240\u793a\uff1a<br \/>\n\u670d\u52a1\u7aef\uff1a<\/p>\n<pre class=\"lang:default decode:true \">const dgram = require('dgram');\nconst server = dgram.createSocket('udp4');\n\nserver.on('close',()=&gt;{\n    console.log('socket\u5df2\u5173\u95ed');\n});\n\nserver.on('error',(err)=&gt;{\n    console.log(err);\n});\n\nserver.on('listening',()=&gt;{\n    console.log('socket\u6b63\u5728\u76d1\u542c\u4e2d...');\n    server.setBroadcast(!0);\/\/\u5f00\u542f\u5e7f\u64ad\n    server.setTTL(128);\n    server.send('\u5927\u5bb6\u597d\u554a\uff0c\u6211\u662f\u670d\u52a1\u7aef.',8061,'1.1.1.255');\n});\n\nserver.on('message',(msg,rinfo)=&gt;{\n    console.log(`receive message from ${rinfo.address}:${rinfo.port}`);\n});\n\nserver.bind('8060','1.1.1.69');<\/pre>\n<p>&nbsp;<\/p>\n<p>\u5ba2\u6237\u7aef\uff1a<\/p>\n<pre class=\"lang:default decode:true \">const dgram = require('dgram');\nconst client = dgram.createSocket('udp4');\n\nclient.on('close',()=&gt;{\n    console.log('socket\u5df2\u5173\u95ed');\n});\n\nclient.on('error',(err)=&gt;{\n    console.log(err);\n});\nclient.on('listening',()=&gt;{\n    console.log('socket\u6b63\u5728\u76d1\u542c\u4e2d...');\n});\nclient.on('message',(msg,rinfo)=&gt;{\n    console.log(`receive message from ${rinfo.address}:${rinfo.port}\uff1a${msg}`);\n});\nclient.bind(8061,'1.1.1.69');<\/pre>\n<p>&nbsp;<\/p>\n<h3 id=\"udp\u7ec4\u64ad\u5b9e\u73b0\">3\u3001UDP\u7ec4\u64ad\u5b9e\u73b0<\/h3>\n<p>\u7ec4\u64ad\u5730\u5740\u662f\u5b9e\u73b0UDP\u7ec4\u64ad\u7684\u5173\u952e\uff0c\u56e0\u6b64\u4e86\u89e3\u7ec4\u64ad\u5730\u5740\u662f\u91cd\u70b9\u3002\u4ec0\u4e48\u662f\u7ec4\u64ad\u5730\u5740\uff1fIANA\u5c06D\u7c7b\u5730\u5740(224.0.0.0-239.255.255.255)\u5206\u914d\u7ed9IP\u7ec4\u64ad\uff0c\u7528\u6765\u6807\u8bc6\u4e00\u4e2aIP\u7ec4\u64ad\u7ec4\uff0c\u7531IGMP(\u7ec4\u7ba1\u7406\u534f\u8bae)\u534f\u8bae\u7ef4\u62a4\u7ec4\u6210\u5458\u5173\u7cfb\uff0c\u5176\u4e2d\uff1a<br \/>\n224.0.0.0\uff5e224.0.0.255\u4e3a\u6c38\u4e45\u7ec4\u5730\u5740\uff0c\u5730\u5740224.0.0.0\u4fdd\u7559\u4e0d\u505a\u5206\u914d\uff0c\u5176\u5b83\u5730\u5740\u4f9b\u8def\u7531\u534f\u8bae\u4f7f\u7528\uff1b<br \/>\n224.0.1.0\uff5e224.0.1.255\u662f\u516c\u7528\u7ec4\u64ad\u5730\u5740\uff0c\u53ef\u4ee5\u7528\u4e8eInternet\uff1b<br \/>\n224.0.2.0\uff5e238.255.255.255\u4e3a\u7528\u6237\u53ef\u7528\u7684\u7ec4\u64ad\u5730\u5740\uff08\u4e34\u65f6\u7ec4\u5730\u5740\uff09\uff0c\u5168\u7f51\u8303\u56f4\u5185\u6709\u6548\uff1b<br \/>\n239.0.0.0\uff5e239.255.255.255\u4e3a\u672c\u5730\u7ba1\u7406\u7ec4\u64ad\u5730\u5740\uff0c\u4ec5\u5728\u7279\u5b9a\u7684\u672c\u5730\u8303\u56f4\u5185\u6709\u6548\u3002<br \/>\n\u5411\u7ec4\u64ad\u5730\u5740\u53d1\u9001\u6570\u636e\u62a5\uff0c\u53ea\u6709\u8be5\u7ec4\u6210\u5458\u624d\u4f1a\u63a5\u6536\u6b64\u6570\u636e\u62a5\u3002<br \/>\ndgram\u6a21\u5757\u7684<code>addMembership()<\/code>\u65b9\u6cd5\u5c06socket\u52a0\u5165\u7ec4\u64ad\u7ec4\u4e2d\uff0c<code>dropMembership()<\/code>\u65b9\u6cd5\u9000\u51fa\u7ec4\u64ad\u7ec4\u3002\u4e0b\u9762\u4ee5\u7ec4\u64ad\u5730\u5740224.100.100.100\u6765\u5b9e\u73b0UDP\u7ec4\u64ad\uff0c\u5982\u4e0b\u6240\u793a\uff1a<br \/>\n\u670d\u52a1\u7aef\uff1a<\/p>\n<pre class=\"lang:default decode:true \">const dgram = require('dgram');\nconst server = dgram.createSocket('udp4');\nconst multicastAddr = '224.100.100.100';\n\nserver.on('close',()=&gt;{\n    console.log('socket\u5df2\u5173\u95ed');\n});\n\nserver.on('error',(err)=&gt;{\n    console.log(err);\n});\n\nserver.on('listening',()=&gt;{\n    console.log('socket\u6b63\u5728\u76d1\u542c\u4e2d...');\n    server.addMembership(multicastAddr);\n    server.setMulticastTTL(128);\n    setInterval(()=&gt;{\n        sendMsg();\n    },1500);\n});\n\nserver.on('message',(msg,rinfo)=&gt;{\n    console.log(`receive message from ${rinfo.address}:${rinfo.port}`);\n});\n\nfunction sendMsg(){\n    server.send('\u5927\u5bb6\u597d\u554a\uff0c\u6211\u662f\u670d\u52a1\u7aef.',8061,multicastAddr);\n}\n\nserver.bind('8060','1.1.1.69');<\/pre>\n<p>&nbsp;<\/p>\n<p><code class=\"sourceCode javascript hljs\"><span class=\"kw\"><span class=\"hljs-keyword\"><\/span><\/span><span class=\"op\"><\/span><\/code><\/p>\n<p>\u5ba2\u6237\u7aef\uff1a<\/p>\n<pre class=\"lang:default decode:true \">const dgram = require('dgram');\nconst client = dgram.createSocket('udp4');\nconst multicastAddr = '224.100.100.100';\n\nclient.on('close',()=&gt;{\n    console.log('socket\u5df2\u5173\u95ed');\n});\n\nclient.on('error',(err)=&gt;{\n    console.log(err);\n});\nclient.on('listening',()=&gt;{\n    console.log('socket\u6b63\u5728\u76d1\u542c\u4e2d...');\n    client.addMembership(multicastAddr);\n});\nclient.on('message',(msg,rinfo)=&gt;{\n    console.log(`receive message from ${rinfo.address}:${rinfo.port}\uff1a${msg}`);\n});\nclient.bind(8061,'1.1.1.69');<\/pre>\n<p>&nbsp;<\/p>\n<p><code class=\"sourceCode javascript hljs\"><span class=\"op\"><\/span><\/code><\/p>\n<p>\u53e6\u5916UDP\u5185\u7f51\u7a7f\u900f\u76f8\u5173\u7684\u5185\u5bb9\uff0c\u5927\u5bb6\u4e5f\u53ef\u81ea\u884c\u4e86\u89e3\u4e00\u4e0b\u3002<\/p>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001\u4ec0\u4e48\u662fUDP? \u8fd9\u91cc\u7b80\u5355\u4ecb\u7ecd\u4e0b\uff0cUDP\uff0c\u5373\u7528\u6237\u6570\u636e\u62a5\u534f\u8bae\uff0c\u4e00\u79cd\u9762\u5411\u65e0\u8fde\u63a5\u7684\u4f20\u8f93\u5c42\u534f\u8bae\uff0c\u63d0\u4f9b\u4e0d\u53ef\u9760 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,28],"tags":[],"class_list":["post-213","post","type-post","status-publish","format-standard","hentry","category-nodejs","category-udp"],"_links":{"self":[{"href":"http:\/\/www.kejidana.com\/index.php?rest_route=\/wp\/v2\/posts\/213","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.kejidana.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.kejidana.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.kejidana.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.kejidana.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=213"}],"version-history":[{"count":0,"href":"http:\/\/www.kejidana.com\/index.php?rest_route=\/wp\/v2\/posts\/213\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.kejidana.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=213"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.kejidana.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=213"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.kejidana.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}