{"id":12986,"date":"2025-04-18T20:07:20","date_gmt":"2025-04-18T12:07:20","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/12986.html"},"modified":"2025-04-18T20:07:20","modified_gmt":"2025-04-18T12:07:20","slug":"udp%e7%bc%96%e7%a8%8b%e6%b5%81%e7%a8%8b%ef%bc%88udp%e5%ae%a2%e6%88%b7%e7%ab%af%e3%80%81%e6%9c%8d%e5%8a%a1%e5%99%a8%e4%ba%92%e5%8f%91%e6%b6%88%e6%81%af%e6%b5%81%e7%a8%8b%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/12986.html","title":{"rendered":"UDP\u7f16\u7a0b\u6d41\u7a0b\uff08UDP\u5ba2\u6237\u7aef\u3001\u670d\u52a1\u5668\u4e92\u53d1\u6d88\u606f\u6d41\u7a0b\uff09"},"content":{"rendered":"<h2>\u4e00\u3001UDP\u7f16\u7a0b\u6d41\u7a0b<\/h2>\n<h3>1.1\u3001 UDP\u6982\u8ff0<\/h3>\n<p>UDP\uff0c\u5373\u7528\u6237\u6570\u636e\u62a5\u534f\u8bae\uff0c\u662f\u4e00\u79cd\u9762\u5411\u65e0\u8fde\u63a5\u7684\u4f20\u8f93\u5c42\u534f\u8bae\u3002\u76f8\u6bd4\u4e8eTCP\u534f\u8bae\uff0cUDP\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\uff1a<\/p>\n<li>\u901f\u5ea6\u8f83\u5feb\uff1a\u7531\u4e8eUDP\u4e0d\u9700\u8981\u5efa\u7acb\u8fde\u63a5\u548c\u8fdb\u884c\u590d\u6742\u7684\u63e1\u624b\u8fc7\u7a0b\uff0c\u56e0\u6b64\u5728\u4f20\u8f93\u6570\u636e\u65f6\u901f\u5ea6\u7a0d\u5feb\u4e8eTCP\u534f\u8bae\u3002<\/li>\n<li>\u9002\u7528\u4e8e\u7b80\u5355\u7684\u8bf7\u6c42\/\u5e94\u7b54\u5e94\u7528\u7a0b\u5e8f\uff1a\u5bf9\u4e8e\u4e00\u4e9b\u7b80\u5355\u7684\u3001\u5bf9\u53ef\u9760\u6027\u8981\u6c42\u4e0d\u9ad8\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u5982DNS\u67e5\u8be2\u548cSNMP\u8bf7\u6c42\uff0cUDP\u80fd\u591f\u63d0\u4f9b\u9ad8\u6548\u7684\u4f20\u8f93\u670d\u52a1\u3002<\/li>\n<li>\u4e0d\u9002\u7528\u4e8e\u6d77\u91cf\u6570\u636e\u4f20\u8f93\uff1a\u7531\u4e8eUDP\u4e0d\u63d0\u4f9b\u53ef\u9760\u7684\u6570\u636e\u4f20\u8f93\u673a\u5236\uff0c\u56e0\u6b64\u5728\u8fdb\u884c\u5927\u6570\u636e\u4f20\u8f93\u65f6\u5bb9\u6613\u51fa\u73b0\u4e22\u5305\u548c\u4e71\u5e8f\u7684\u60c5\u51b5\uff0c\u4e0d\u5efa\u8bae\u4f7f\u7528UDP\u8fdb\u884c\u6b64\u7c7b\u4f20\u8f93\u3002<\/li>\n<li>\u5e7f\u64ad\u548c\u591a\u64ad\u5e94\u7528\u5fc5\u987b\u4f7f\u7528UDP\uff1aUDP\u652f\u6301\u5e7f\u64ad\u548c\u591a\u64ad\u4f20\u8f93\uff0c\u56e0\u6b64\u5bf9\u4e8e\u9700\u8981\u8fdb\u884c\u5e7f\u64ad\u548c\u591a\u64ad\u7684\u5e94\u7528\uff0c\u5982\u89c6\u9891\u76f4\u64ad\u548c\u7ec4\u64ad\u901a\u4fe1\uff0c\u5fc5\u987b\u4f7f\u7528UDP\u534f\u8bae\u3002<\/li>\n<p>UDP\u5e94\u7528\uff1a<\/p>\n<p>UDP\u534f\u8bae\u88ab\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5404\u79cd\u7f51\u7edc\u5e94\u7528\u4e2d\uff0c\u5305\u62ec\u4f46\u4e0d\u9650\u4e8e\u4ee5\u4e0b\u51e0\u79cd\uff1a<\/p>\n<ul>\n<li>DNS\uff08\u57df\u540d\u89e3\u6790\uff09\uff1aDNS\u4f7f\u7528UDP\u8fdb\u884c\u57df\u540d\u89e3\u6790\u8bf7\u6c42\u548c\u54cd\u5e94\u7684\u4f20\u8f93\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8be2\u901f\u5ea6\u3002<\/li>\n<li>NFS\uff08\u7f51\u7edc\u6587\u4ef6\u7cfb\u7edf\uff09\uff1aNFS\u4f7f\u7528UDP\u8fdb\u884c\u6587\u4ef6\u64cd\u4f5c\u8bf7\u6c42\u548c\u54cd\u5e94\u7684\u4f20\u8f93\uff0c\u4ee5\u63d0\u9ad8\u6587\u4ef6\u8bbf\u95ee\u901f\u5ea6\u3002<\/li>\n<li>RTP\uff08\u5b9e\u65f6\u4f20\u8f93\u534f\u8bae\uff09\uff1aRTP\u4f7f\u7528UDP\u8fdb\u884c\u5b9e\u65f6\u97f3\u89c6\u9891\u6570\u636e\u7684\u4f20\u8f93\uff0c\u4ee5\u51cf\u5c11\u5ef6\u8fdf\u3002<\/li>\n<\/ul>\n<p>\u6b64\u5916\uff0c\u4e00\u4e9b\u5b9e\u65f6\u6027\u8981\u6c42\u8f83\u9ad8\u7684\u5e94\u7528\uff0c\u5982\u5728\u7ebf\u6e38\u620f\u548cVoIP\u901a\u8bdd\uff0c\u4e5f\u4f1a\u9009\u62e9\u4f7f\u7528UDP\u534f\u8bae\u6765\u51cf\u5c11\u5ef6\u8fdf\uff0c\u63d0\u9ad8\u7528\u6237\u4f53\u9a8c<\/p>\n<h3>1.2\u3001\u7f51\u7edc\u7f16\u7a0b\u63a5\u53e3socket<\/h3>\n<p>Socket\uff0c\u4e5f\u88ab\u79f0\u4e3a\\&#8221;\u5957\u63a5\u5b57\\&#8221;\uff0c\u662f\u7f51\u7edc\u7f16\u7a0b\u4e2d\u7528\u4e8e\u5b9e\u73b0\u4e0d\u540c\u4e3b\u673a\u4e0a\u8fdb\u7a0b\u95f4\u901a\u4fe1\u7684\u4e00\u79cd\u6280\u672f\u3002\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u5c06\u7f51\u7edc\u901a\u4fe1\u62bd\u8c61\u4e3a\u6587\u4ef6\u64cd\u4f5c\u7684\u63a5\u53e3\uff0c\u4f7f\u5f97\u7a0b\u5e8f\u5458\u53ef\u4ee5\u901a\u8fc7\u7b80\u5355\u7684\u51fd\u6570\u8c03\u7528\u6765\u5b9e\u73b0\u590d\u6742\u7684\u7f51\u7edc\u901a\u4fe1\u529f\u80fd\u3002<\/p>\n<p>Socket\u7684\u7279\u70b9<\/p>\n<li>\u6587\u4ef6\u63cf\u8ff0\u7b26\uff1aSocket\u662f\u4e00\u79cd\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5b83\u4ee3\u8868\u4e86\u4e00\u4e2a\u901a\u4fe1\u7ba1\u9053\u7684\u7aef\u70b9\u3002\u901a\u8fc7Socket\uff0c\u6211\u4eec\u53ef\u4ee5\u50cf\u64cd\u4f5c\u6587\u4ef6\u4e00\u6837\uff0c\u4f7f\u7528read\u3001write\u3001close\u7b49\u51fd\u6570\u6765\u53d1\u9001\u548c\u63a5\u6536\u7f51\u7edc\u6570\u636e\u3002<\/li>\n<li>\u901a\u4fe1\u7aef\u70b9\uff1aSocket\u662f\u7f51\u7edc\u901a\u4fe1\u7684\u7aef\u70b9\uff0c\u6bcf\u4e2aSocket\u90fd\u6709\u4e00\u4e2a\u552f\u4e00\u7684\u5730\u5740\uff0c\u901a\u8fc7\u8fd9\u4e2a\u5730\u5740\uff0c\u6211\u4eec\u53ef\u4ee5\u4e0e\u8fdc\u7a0b\u4e3b\u673a\u4e0a\u7684Socket\u8fdb\u884c\u901a\u4fe1\u3002<\/li>\n<li>\u7f51\u7edc\u6570\u636e\u64cd\u4f5c\uff1a\u901a\u8fc7Socket\uff0c\u6211\u4eec\u53ef\u4ee5\u65b9\u4fbf\u5730\u8fdb\u884c\u7f51\u7edc\u6570\u636e\u7684\u53d1\u9001\u548c\u63a5\u6536\u3002Socket\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u51fd\u6570\u63a5\u53e3\uff0c\u5982send\u3001recv\u3001sendto\u3001recvfrom\u7b49\uff0c\u7528\u4e8e\u5404\u79cd\u7f51\u7edc\u6570\u636e\u64cd\u4f5c\u3002<\/li>\n<li>Socket\u51fd\u6570\uff1a\u8981\u83b7\u5f97\u4e00\u4e2aSocket\uff0c\u6211\u4eec\u9700\u8981\u8c03\u7528socket()\u51fd\u6570\u3002\u8be5\u51fd\u6570\u8fd4\u56de\u4e00\u4e2aSocket\u63cf\u8ff0\u7b26\uff0c\u7528\u4e8e\u540e\u7eed\u7684\u7f51\u7edc\u901a\u4fe1\u64cd\u4f5c\u3002<\/li>\n<p>Socket\u7684\u5206\u7c7b<\/p>\n<p>\u6839\u636e\u4f7f\u7528\u7684\u534f\u8bae\u548c\u901a\u4fe1\u65b9\u5f0f\u7684\u4e0d\u540c\uff0cSocket\u53ef\u4ee5\u5206\u4e3a\u4ee5\u4e0b\u51e0\u79cd\u7c7b\u578b\uff1a<\/p>\n<ul>\n<li>SOCK_STREAM\uff1a\u6d41\u5f0f\u5957\u63a5\u5b57\uff0c\u7528\u4e8eTCP\u534f\u8bae\u3002\u5b83\u63d0\u4f9b\u4e86\u53ef\u9760\u7684\u3001\u9762\u5411\u8fde\u63a5\u7684\u901a\u4fe1\u65b9\u5f0f\uff0c\u6570\u636e\u4ee5\u6d41\u7684\u5f62\u5f0f\u4f20\u8f93\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u6570\u636e\u7684\u53ef\u9760\u6027\u548c\u987a\u5e8f\u6027\u3002<\/li>\n<li>SOCK_DGRAM\uff1a\u6570\u636e\u62a5\u5957\u63a5\u5b57\uff0c\u7528\u4e8eUDP\u534f\u8bae\u3002\u5b83\u63d0\u4f9b\u4e86\u4e0d\u53ef\u9760\u3001\u65e0\u8fde\u63a5\u7684\u901a\u4fe1\u65b9\u5f0f\uff0c\u6570\u636e\u4ee5\u6570\u636e\u62a5\u7684\u5f62\u5f0f\u4f20\u8f93\uff0c\u4e0d\u4fdd\u8bc1\u6570\u636e\u7684\u53ef\u9760\u6027\u548c\u987a\u5e8f\u6027\u3002<\/li>\n<li>SOCK_RAW\uff1a\u539f\u59cb\u5957\u63a5\u5b57\uff0c\u7528\u4e8e\u5176\u4ed6\u5c42\u6b21\u7684\u534f\u8bae\u64cd\u4f5c\u3002\u5b83\u5141\u8bb8\u76f4\u63a5\u8bbf\u95ee\u7f51\u7edc\u5c42\u6570\u636e\uff0c\u53ef\u4ee5\u7528\u4e8e\u5b9e\u73b0\u81ea\u5b9a\u4e49\u7684\u7f51\u7edc\u534f\u8bae\u3002<\/li>\n<\/ul>\n<h3>1.3&nbsp;UDP\u7f16\u7a0bC\/S\u67b6\u6784<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"524\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418120719-680240770a10d.png\" width=\"612\"><\/p>\n<p>UDP\u7f51\u7edc\u7f16\u7a0b\u6d41\u7a0b\uff1a<\/p>\n<p>\u670d\u52a1\u5668\uff1a \u521b\u5efa\u5957\u63a5\u5b57&nbsp;socket(&nbsp;)<\/p>\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; \u5c06\u670d\u52a1\u5668\u7684ip\u5730\u5740\u3001\u7aef\u53e3\u53f7\u4e0e\u5957\u63a5\u5b57\u8fdb\u884c\u7ed1\u5b9a&nbsp;bind(&nbsp;)<\/p>\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; \u63a5\u6536\u6570\u636e&nbsp;recvfrom()<\/p>\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\u53d1\u9001\u6570\u636e&nbsp;sendto()<\/p>\n<p>\u5ba2\u6237\u7aef\uff1a&nbsp; \u521b\u5efa\u5957\u63a5\u5b57&nbsp;socket()<\/p>\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; \u53d1\u9001\u6570\u636e&nbsp;sendto()<\/p>\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; \u63a5\u6536\u6570\u636e&nbsp;recvfrom()<\/p>\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; \u5173\u95ed\u5957\u63a5\u5b57&nbsp;close()&nbsp;<\/p>\n<h2>\u4e8c\u3001UDP\u7f16\u7a0b-\u521b\u5efa\u5957\u63a5\u5b57&nbsp;<\/h2>\n<h3>2.1&nbsp;\u521b\u5efasocket\u5957\u63a5\u5b57<\/h3>\n<p>#include &lt;sys\/types.h&gt;<br \/>\n#include &lt;sys\/socket.h&gt;<br \/>\nint socket(int domain, int type, int protocol);<br \/>\n\u529f\u80fd\uff1a<br \/>\n    \u521b\u5efa\u4e00\u4e2a\u5957\u63a5\u5b57\uff0c\u8fd4\u56de\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26<br \/>\n\u53c2\u6570\uff1a<br \/>\n    domain\uff1a\u901a\u4fe1\u57df\uff0c\u534f\u8bae\u65cf<br \/>\n    AF_UNIX \u672c\u5730\u901a\u4fe1<br \/>\n    AF_INET ipv4\u7f51\u7edc\u534f\u8bae<br \/>\n    AF_INET6 ipv6\u7f51\u7edc\u534f\u8bae<br \/>\n    AF_PACKET \u5e95\u5c42\u63a5\u53e3<br \/>\ntype\uff1a<br \/>\n  \u5957\u63a5\u5b57\u7684\u7c7b\u578b<br \/>\n    SOCK_STREAM \u6d41\u5f0f\u5957\u63a5\u5b57\uff08tcp\uff09<br \/>\n    SOCK_DGRAM \u6570\u636e\u62a5\u5957\u63a5\u5b57\uff08udp\uff09<br \/>\n    SOCK_RAW \u539f\u59cb\u5957\u63a5\u5b57\uff08\u7528\u4e8e\u94fe\u8def\u5c42\uff09<br \/>\nprotocol\uff1a<br \/>\n    \u9644\u52a0\u534f\u8bae\uff0c\u5982\u679c\u4e0d\u9700\u8981\uff0c\u5219\u8bbe\u7f6e\u4e3a0<br \/>\n\u8fd4\u56de\u503c\uff1a<br \/>\n    \u6210\u529f\uff1a\u6587\u4ef6\u63cf\u8ff0\u7b26<br \/>\n    \u5931\u8d25\uff1a-1 <\/p>\n<p><span style=\"color:#fe2c24\">\u7279\u70b9<\/span>&nbsp;<\/p>\n<ul>\n<li>&nbsp;\u521b\u5efa\u5957\u63a5\u5b57\u65f6\uff0c\u7cfb\u7edf\u4e0d\u4f1a\u5206\u914d\u7aef\u53e3 <\/li>\n<li>&nbsp;\u521b\u5efa\u7684\u5957\u63a5\u5b57\u9ed8\u8ba4\u5c5e\u6027\u662f\u4e3b\u52a8\u7684\uff0c\u5373\u4e3b\u52a8\u53d1\u8d77\u670d\u52a1\u7684\u8bf7\u6c42;\u5f53\u4f5c\u4e3a\u670d\u52a1\u5668\u65f6\uff0c\u5f80\u5f80\u9700\u8981\u4fee\u6539\u4e3a\u88ab\u52a8\u7684<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb1w\u6b21\uff0c\u70b9\u8d5e66\u6b21\uff0c\u6536\u85cf87\u6b21\u3002UDP\u7f16\u7a0b-\u521b\u5efa\u5957\u63a5\u5b57\u3001\u53d1\u9001\u3001\u7ed1\u5b9a\u3001\u63a5\u6536\u6570\u636e\uff0cUDP\u5ba2\u6237\u7aef\u548c 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