{"id":29465,"date":"2025-04-20T09:30:56","date_gmt":"2025-04-20T01:30:56","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/29465.html"},"modified":"2025-04-20T09:30:56","modified_gmt":"2025-04-20T01:30:56","slug":"linux%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b4-websocket%e5%8d%8f%e8%ae%ae%e5%8f%8a%e6%9c%8d%e5%8a%a1%e5%99%a8%e7%9a%84%e7%ae%80%e6%98%93%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/29465.html","title":{"rendered":"linux\u7f51\u7edc\u7f16\u7a0b4\u2014\u2014WebSocket\u534f\u8bae\u53ca\u670d\u52a1\u5668\u7684\u7b80\u6613\u5b9e\u73b0"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\n<ul>\n<li>1. WebSocket\u670d\u52a1\u5668\u4ecb\u7ecd<\/li>\n<li>\n<ul>\n<li>\n<ul>\n<li>1.1 WebSocket \u534f\u8bae\u7684\u7279\u70b9<\/li>\n<li>1.2 WebSocket \u4e0e HTTP \u7684\u533a\u522b&#xff1a;<\/li>\n<li>1.3 WebSocket \u7684\u5e94\u7528\u573a\u666f&#xff1a;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>2. WebSocket\u63e1\u624b\u534f\u8bae\u8be6\u89e3<\/li>\n<li>3. \u53ef\u80fd\u51fa\u73b0\u7684\u9519\u8bef<\/li>\n<li>4. \u63e1\u624b\u534f\u8bae\u7f16\u7801\u5b9e\u73b0<\/li>\n<li>5. websocket\u4f20\u8f93\u534f\u8bae\u5b9e\u73b0<\/li>\n<li>\n<ul>\n<li>\n<ul>\n<li>5.1 websocket\u5e27\u683c\u5f0f<\/li>\n<li>5.2 \u89e3\u5305\u5ba2\u6237\u7aef\u6570\u636e<\/li>\n<li>5.3 \u670d\u52a1\u7aef\u53d1\u5305<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u5b66\u4e60\u53c2\u8003<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>1. WebSocket\u670d\u52a1\u5668\u4ecb\u7ecd<\/h3>\n<p>\u672c\u6587\u8be6\u7ec6\u4ecb\u7ecd\u4e86WebSocket\u534f\u8bae\u7684\u7279\u70b9\u3001\u4e0eHTTP\u7684\u533a\u522b\u4ee5\u53ca\u5e94\u7528\u573a\u666f&#xff1b;\u7136\u540e\u5206\u6790\u4e86WebSocket\u534f\u8bae\u7684\u4e3b\u8981\u5185\u5bb9&#xff1b;\u6700\u540e\u501f\u52a9\u524d\u9762\u7684\u5e95\u5c42reactor\u7684\u4ee3\u7801\u5b9e\u73b0\u4e86\u4e00\u4e2aWebSocket\u534f\u8bae\u7684Web\u670d\u52a1\u5668\u3002<\/p>\n<p>\u5b8c\u6574\u9879\u76ee\u4ee3\u7801\u53c2\u8003:\u6211\u7684github\u9879\u76ee<\/p>\n<p>WebSocket \u662f\u4e00\u79cd\u5728\u5ba2\u6237\u7aef&#xff08;\u901a\u5e38\u662f\u6d4f\u89c8\u5668&#xff09;\u548c\u670d\u52a1\u5668\u4e4b\u95f4\u5efa\u7acb\u53cc\u5411\u901a\u4fe1\u901a\u9053\u7684\u534f\u8bae&#xff0c;\u5141\u8bb8\u5b83\u4eec\u901a\u8fc7\u4e00\u4e2a\u6301\u4e45\u7684 TCP \u8fde\u63a5\u8fdb\u884c\u5b9e\u65f6\u6570\u636e\u4ea4\u6362\u3002\u4e0e\u4f20\u7edf\u7684 HTTP \u8bf7\u6c42-\u54cd\u5e94\u6a21\u578b\u4e0d\u540c&#xff0c;WebSocket \u63d0\u4f9b\u4e86\u5168\u53cc\u5de5&#xff08;full-duplex&#xff09;\u7684\u901a\u4fe1&#xff0c;\u5373\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u90fd\u53ef\u4ee5\u5728\u4efb\u4f55\u65f6\u95f4\u5411\u5bf9\u65b9\u53d1\u9001\u6d88\u606f&#xff0c;\u800c\u65e0\u9700\u7b49\u5f85\u54cd\u5e94\u3002<\/p>\n<h5>1.1 WebSocket \u534f\u8bae\u7684\u7279\u70b9<\/h5>\n<li>\u6301\u4e45\u8fde\u63a5&#xff1a;WebSocket \u5efa\u7acb\u8fde\u63a5\u540e&#xff0c;\u5b83\u4fdd\u6301\u6253\u5f00\u72b6\u6001&#xff0c;\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u4e4b\u95f4\u53ef\u4ee5\u6301\u7eed\u4ea4\u6362\u6570\u636e&#xff0c;\u76f4\u5230\u8fde\u63a5\u88ab\u4e00\u65b9\u4e3b\u52a8\u5173\u95ed\u3002<\/li>\n<li>\u5168\u53cc\u5de5\u901a\u4fe1&#xff1a;\u53cc\u5411\u901a\u4fe1\u901a\u9053\u53ef\u4ee5\u540c\u65f6\u53d1\u9001\u548c\u63a5\u6536\u6570\u636e\u3002\u670d\u52a1\u5668\u53ef\u4ee5\u5728\u4e0d\u4f9d\u8d56\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\u60c5\u51b5\u4e0b\u63a8\u9001\u6570\u636e\u3002<\/li>\n<li>\u51cf\u5c11\u7f51\u7edc\u5f00\u9500&#xff1a;WebSocket \u901a\u8fc7\u5347\u7ea7\u4e00\u6b21 HTTP \u8bf7\u6c42\u6765\u5efa\u7acb\u8fde\u63a5&#xff0c;\u4e4b\u540e\u7684\u6570\u636e\u4ea4\u6362\u53ea\u901a\u8fc7\u8f7b\u91cf\u7684 WebSocket \u5e27\u683c\u5f0f&#xff0c;\u800c\u4e0d\u50cf HTTP \u9700\u8981\u989d\u5916\u7684\u8bf7\u6c42\u5934\u90e8\u4fe1\u606f&#xff0c;\u56e0\u800c\u5927\u5927\u51cf\u5c11\u4e86\u7f51\u7edc\u5f00\u9500\u3002<\/li>\n<li>\u5b9e\u65f6\u6570\u636e\u4f20\u8f93&#xff1a;\u9002\u5408\u5b9e\u65f6\u5e94\u7528&#xff0c;\u5982\u5728\u7ebf\u804a\u5929\u3001\u80a1\u7968\u884c\u60c5\u3001\u6e38\u620f\u3001\u7269\u8054\u7f51\u6570\u636e\u4f20\u8f93\u7b49\u3002<\/li>\n<p>WebSocket\u534f\u8bae\u662f\u901a\u8fc7HTTP1.1\u534f\u8bae\u7684\u63e1\u624b\u8fc7\u7a0b\u5efa\u7acb\u7684&#xff0c;\u4f46\u8fde\u63a5\u5efa\u7acb\u540e\u4e24\u8005\u7684\u901a\u4fe1\u673a\u5236\u5b8c\u5168\u4e0d\u540c\u3002<\/p>\n<p>WebSocket\u63e1\u624b\u5934\u90e8&#xff1a;<\/p>\n<p>GET \/chat HTTP\/1.1<br \/>\nHost: example.com<br \/>\nUpgrade: websocket<br \/>\nConnection: Upgrade<br \/>\nSec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ&#061;&#061;<br \/>\nSec-WebSocket-Version: 13<\/p>\n<p>WebSocket\u63e1\u624b\u6210\u529f\u540e\u5347\u7ea7\u8fde\u63a5&#xff1a;<\/p>\n<p>HTTP\/1.1 101 Switching Protocols<br \/>\nUpgrade: websocket<br \/>\nConnection: Upgrade<br \/>\nSec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK&#043;xOo&#061;<\/p>\n<h5>1.2 WebSocket \u4e0e HTTP \u7684\u533a\u522b&#xff1a;<\/h5>\n<ul>\n<li>\u53cc\u5411\u901a\u4fe1 vs \u5355\u5411\u8bf7\u6c42\u54cd\u5e94&#xff1a;HTTP \u662f\u5355\u5411\u7684\u8bf7\u6c42-\u54cd\u5e94\u6a21\u578b&#xff0c;\u5ba2\u6237\u7aef\u5fc5\u987b\u53d1\u8d77\u8bf7\u6c42&#xff0c;\u670d\u52a1\u5668\u54cd\u5e94\u3002\u800c WebSocket \u662f\u53cc\u5411\u7684&#xff0c;\u53cc\u65b9\u53ef\u4ee5\u968f\u65f6\u53d1\u9001\u6570\u636e\u3002<\/li>\n<li>\u6301\u4e45\u8fde\u63a5&#xff1a;HTTP \u9700\u8981\u6bcf\u6b21\u53d1\u8d77\u65b0\u7684\u8fde\u63a5\u8bf7\u6c42&#xff08;\u5373\u4f7f\u662f HTTP\/1.1&#xff0c;\u4e5f\u9700\u8981\u4fdd\u6301\u8fde\u63a5&#xff09;&#xff0c;\u800c WebSocket \u5728\u5efa\u7acb\u8fde\u63a5\u540e&#xff0c;\u8fde\u63a5\u662f\u6301\u4e45\u7684&#xff0c;\u76f4\u5230\u4e3b\u52a8\u5173\u95ed\u3002<\/li>\n<li>\u534f\u8bae\u5934\u90e8\u5927\u5c0f&#xff1a;HTTP \u8bf7\u6c42\u548c\u54cd\u5e94\u5934\u90e8\u4fe1\u606f\u8f83\u591a&#xff0c;\u800c WebSocket \u5e27\u7684\u534f\u8bae\u5934\u90e8\u76f8\u5bf9\u8f83\u5c11&#xff0c;\u51cf\u5c11\u4e86\u6570\u636e\u4f20\u8f93\u7684\u5f00\u9500\u3002<\/li>\n<\/ul>\n<h5>1.3 WebSocket \u7684\u5e94\u7528\u573a\u666f&#xff1a;<\/h5>\n<p>Http\u534f\u8bae\u548cWebSocket\u534f\u8bae\u5e38\u5e38\u7ed3\u5408\u4f7f\u7528&#xff0c;\u4f8b\u5982HTTP\u7528\u4e8e\u521d\u59cb\u7684\u9875\u9762\u52a0\u8f7d\u548c\u9759\u6001\u8d44\u6e90\u83b7\u53d6&#xff0c;WebSocket\u7528\u4e8e\u9700\u8981\u957f\u65f6\u95f4\u5b9e\u65f6\u4ea4\u4e92\u7684\u573a\u666f\u3002<\/p>\n<li>\u5b9e\u65f6\u804a\u5929&#xff1a;\u50cf Slack\u3001\u5fae\u4fe1\u3001Facebook Messenger \u8fd9\u6837\u9700\u8981\u5b9e\u65f6\u901a\u4fe1\u7684\u5e94\u7528\u3002<\/li>\n<li>\u5b9e\u65f6\u80a1\u7968\u884c\u60c5&#xff1a;\u80a1\u7968\u4ea4\u6613\u5e73\u53f0\u3001\u52a0\u5bc6\u8d27\u5e01\u4ea4\u6613\u6240\u7b49&#xff0c;\u9700\u8981\u4e0d\u65ad\u63a8\u9001\u6700\u65b0\u7684\u5e02\u573a\u6570\u636e\u3002<\/li>\n<li>\u591a\u4eba\u5728\u7ebf\u6e38\u620f&#xff1a;\u6e38\u620f\u670d\u52a1\u5668\u9700\u8981\u4e0e\u6bcf\u4e2a\u5ba2\u6237\u7aef\u9891\u7e41\u3001\u5b9e\u65f6\u4ea4\u6362\u6570\u636e\u3002<\/li>\n<li>\u5b9e\u65f6\u901a\u77e5\u7cfb\u7edf&#xff1a;\u4f8b\u5982\u793e\u4ea4\u7f51\u7edc\u4e2d\u7684\u901a\u77e5&#xff0c;\u6216\u7535\u5b50\u5546\u52a1\u4e2d\u7684\u8ba2\u5355\u66f4\u65b0\u3002<\/li>\n<li>IoT \u8bbe\u5907\u7ba1\u7406&#xff1a;\u7269\u8054\u7f51\u5e94\u7528\u53ef\u4ee5\u4f7f\u7528 WebSocket \u5b9e\u65f6\u7ba1\u7406\u548c\u76d1\u63a7\u8bbe\u5907\u7684\u72b6\u6001\u3002<\/li>\n<h3>2. WebSocket\u63e1\u624b\u534f\u8bae\u8be6\u89e3<\/h3>\n<p>\u4e3b\u8981\u4ecb\u7ecd\u63e1\u624b\u534f\u8bae&#xff0c;\u5728\u63e1\u624b\u9636\u6bb5&#xff0c;\u5ba2\u6237\u7aef\u4f1a\u5728\u8bf7\u6c42\u5934\u4e2d\u53d1\u9001\u4e00\u4e2asec-websocket-key<\/p>\n<p>sec-websocket-key: <span class=\"token assign-left variable\">e3bLzpFK7Li8RHh8DZL87A<\/span><span class=\"token operator\">&#061;&#061;<\/span><\/p>\n<p>\u670d\u52a1\u5668\u9700\u8981\u62ff\u5230\u8fd9\u4e2akey\u503c&#xff0c;\u7136\u540e\u8fdb\u884c\u5982\u4e0b\u8ba1\u7b97<\/p>\n<ul>\n<li>\u5c06key\u4e0e\u4e00\u4e2aGUID\u8fde\u7ed3&#xff0c;\u8be5GUID\u503c\u4e3a258EAFA5-E914-47DA-95CA-C5AB0DC85B11&#xff0c;\u5f97\u5230input<\/li>\n<li>\u4f7f\u7528SHA-1\u7b97\u6cd5\u8ba1\u7b97input\u5f97\u5230input2<\/li>\n<li>\u4f7f\u7528base64\u7b97\u6cd5\u8ba1\u7b97input2\u5f97\u5230ouput<\/li>\n<\/ul>\n<p>\u6700\u540e\u5728\u54cd\u5e94\u5934\u4e2d\u53d1\u9001sec-websocket-Accpet\u5934\u5373\u53ef<\/p>\n<p>Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK&#043;xOo<span class=\"token operator\">&#061;<\/span><\/p>\n<p>\u4e4b\u540e&#xff0c;\u53cc\u65b9\u53ef\u4ee5\u4fdd\u6301\u8fde\u63a5&#xff0c;\u8fdb\u884c\u5b9e\u65f6\u7684\u5168\u53cc\u5de5\u7684\u4ea4\u4e92\u3002<\/p>\n<h3>3. \u53ef\u80fd\u51fa\u73b0\u7684\u9519\u8bef<\/h3>\n<li>\n<p>\u7f16\u8bd1\u65f6\u94fe\u63a5\u5668\u663e\u793a\u627e\u4e0d\u5230\u4e00\u4e9b\u7b26\u53f7\u7684\u5b9a\u4e49<\/p>\n<p>\u8bb0\u5f97\u94fe\u63a5ssl\u5e93\u548ccrypto\u5e93<\/p>\n<p> gcc -o xxx xxx1.c xxx2.c -lssl -lcrypto\n <\/li>\n<li>\n<p>\u5ba2\u6237\u7aef\u53d1\u9001\u201dunknown opcode&#034;&#xff0c;\u5e76\u4e3b\u52a8\u5173\u95ed\u8fde\u63a5<\/p>\n<\/li>\n<p>\u200b \u4e00\u5b9a\u662f\u670d\u52a1\u7aef\u53d1\u9001\u7684\u6570\u636e\u4e0d\u7b26\u5408\u534f\u8bae&#xff0c;\u6216\u8005Sec-WebSocket-Accept\u503c\u6709\u8bef\u3002<\/p>\n<h3>4. \u63e1\u624b\u534f\u8bae\u7f16\u7801\u5b9e\u73b0<\/h3>\n<p>\u8fd9\u91cc\u53ea\u5b9e\u73b0\u4e86\u5efa\u7acb\u63e1\u624b\u534f\u8bae\u8fd9\u4e00\u73af\u8282&#xff0c;\u8fde\u63a5\u5efa\u7acb\u540e\u53d1\u9001\u7684\u6d88\u606f\u90fd\u5e94\u8be5\u9075\u5b88websocket\u534f\u8bae\u7684\u683c\u5f0f\u3002\u5b8c\u6574\u7684websocket\u56de\u58f0\u670d\u52a1\u5668\u4ee3\u7801\u53ef\u53c2\u8003\u5b8c\u6574\u9879\u76ee\u4ee3\u7801\u53c2\u8003:\u6211\u7684github\u9879\u76ee\u3002<\/p>\n<p>\u5b8c\u6574\u7684websocket\u534f\u8bae\u8bf7\u53c2\u8003rfc6455\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;fcntl.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/epoll.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/stat.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;openssl\/sha.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;openssl\/bio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;openssl\/evp.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;openssl\/buffer.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;webserver.h&#034;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;websocket.h&#034;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">DEBUG<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">WEBSOCKET_KEY_LENGTH<\/span> <span class=\"token expression\"><span class=\"token number\">256<\/span><\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8d1f\u8d23\u6309\u7167rfc6455\u7684\u89c4\u5b9a\u8f93\u51faSec-WebSocket-Accept\u7684\u503c<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">encode_key<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>key<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> n<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>output<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> hash<span class=\"token punctuation\">[<\/span>SHA_DIGEST_LENGTH<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">SHA1<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> n<span class=\"token punctuation\">,<\/span> hash<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    BIO <span class=\"token operator\">*<\/span>bmem<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span>b64<span class=\"token punctuation\">;<\/span><br \/>\n    BUF_MEM <span class=\"token operator\">*<\/span>bptr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    b64 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">BIO_new<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">BIO_f_base64<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    bmem <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">BIO_new<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">BIO_s_mem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    b64 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">BIO_push<\/span><span class=\"token punctuation\">(<\/span>b64<span class=\"token punctuation\">,<\/span> bmem<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">BIO_write<\/span><span class=\"token punctuation\">(<\/span>b64<span class=\"token punctuation\">,<\/span> hash<span class=\"token punctuation\">,<\/span> SHA_DIGEST_LENGTH<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">BIO_flush<\/span><span class=\"token punctuation\">(<\/span>b64<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">BIO_get_mem_ptr<\/span><span class=\"token punctuation\">(<\/span>b64<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>bptr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">memcpy<\/span><span class=\"token punctuation\">(<\/span>output<span class=\"token punctuation\">,<\/span> bptr<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span> bptr<span class=\"token operator\">-&gt;<\/span>length<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8fd9\u91cc\u5207\u8bb0\u662fbptr-&gt;length\u5b57\u7b26\u6570\u7ec4\u7684\u957f\u5ea6<\/span><br \/>\n    output<span class=\"token punctuation\">[<\/span>bptr<span class=\"token operator\">-&gt;<\/span>length <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">BIO_free_all<\/span><span class=\"token punctuation\">(<\/span>b64<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">handshake<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Conn<\/span> <span class=\"token operator\">*<\/span>conn<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ handshake<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> output<span class=\"token punctuation\">[<\/span>WEBSOCKET_KEY_LENGTH<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> input<span class=\"token punctuation\">[<\/span>WEBSOCKET_KEY_LENGTH<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>key <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">strstr<\/span><span class=\"token punctuation\">(<\/span>conn<span class=\"token operator\">-&gt;<\/span>rbuffer<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Sec-WebSocket-Key:&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>key<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        conn<span class=\"token operator\">-&gt;<\/span>wlength <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    key <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">19<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>key <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">*<\/span>key <span class=\"token operator\">!&#061;<\/span> <span class=\"token string\">&#039; &#039;<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">*<\/span>key <span class=\"token operator\">!&#061;<\/span> <span class=\"token string\">&#039;\\\\r&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        input<span class=\"token punctuation\">[<\/span>i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span>key<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">strcpy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>input<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;258EAFA5-E914-47DA-95CA-C5AB0DC85B11&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">encode_key<\/span><span class=\"token punctuation\">(<\/span>input<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>input<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> output<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">stat<\/span> filestat <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> sended <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">snprintf<\/span><span class=\"token punctuation\">(<\/span>conn<span class=\"token operator\">-&gt;<\/span>wbuffer<span class=\"token punctuation\">,<\/span> BUFFER_LENGTH<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token string\">&#034;HTTP\/1.1 101 Switching Protocols\\\\r\\\\n&#034;<\/span><br \/>\n        <span class=\"token string\">&#034;Upgrade: websocket\\\\r\\\\n&#034;<\/span><br \/>\n        <span class=\"token string\">&#034;Connection: Upgrade\\\\r\\\\n&#034;<\/span><br \/>\n        <span class=\"token string\">&#034;Sec-WebSocket-Accept: %s\\\\r\\\\n\\\\r\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>output<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%s|||\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> output<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    conn<span class=\"token operator\">-&gt;<\/span>wlength <span class=\"token operator\">&#061;<\/span> sended<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">ws_request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Conn<\/span> <span class=\"token operator\">*<\/span>conn<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&lt;&lt;&lt;&lt;&lt;input&lt;&lt;&lt;&lt;&lt;\\\\n %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> conn<span class=\"token operator\">-&gt;<\/span>rbuffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>conn<span class=\"token operator\">-&gt;<\/span>status <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">handshake<\/span><span class=\"token punctuation\">(<\/span>conn<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        conn<span class=\"token operator\">-&gt;<\/span>status <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>conn<span class=\"token operator\">-&gt;<\/span>status <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        conn<span class=\"token operator\">-&gt;<\/span>payload <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">decode_packet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>conn<span class=\"token operator\">-&gt;<\/span>rbuffer<span class=\"token punctuation\">,<\/span> conn<span class=\"token operator\">-&gt;<\/span>mask<span class=\"token punctuation\">,<\/span> conn<span class=\"token operator\">-&gt;<\/span>rlength<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;data: %s, length: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> conn<span class=\"token operator\">-&gt;<\/span>payload<span class=\"token punctuation\">,<\/span> ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        conn<span class=\"token operator\">-&gt;<\/span>wlength <span class=\"token operator\">&#061;<\/span> ret<span class=\"token punctuation\">;<\/span><br \/>\n        conn<span class=\"token operator\">-&gt;<\/span>status <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">ws_response<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Conn<\/span> <span class=\"token operator\">*<\/span>conn<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>conn<span class=\"token operator\">-&gt;<\/span>status <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        conn<span class=\"token operator\">-&gt;<\/span>wlength <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">encode_packet<\/span><span class=\"token punctuation\">(<\/span>conn<span class=\"token operator\">-&gt;<\/span>wbuffer<span class=\"token punctuation\">,<\/span> conn<span class=\"token operator\">-&gt;<\/span>mask<span class=\"token punctuation\">,<\/span> conn<span class=\"token operator\">-&gt;<\/span>payload<span class=\"token punctuation\">,<\/span> conn<span class=\"token operator\">-&gt;<\/span>wlength<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        conn<span class=\"token operator\">-&gt;<\/span>status <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    conn<span class=\"token operator\">-&gt;<\/span>wbuffer<span class=\"token punctuation\">[<\/span>conn<span class=\"token operator\">-&gt;<\/span>wlength<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&gt;&gt;&gt;&gt;output&gt;&gt;&gt;&gt;\\\\n%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> conn<span class=\"token operator\">-&gt;<\/span>wbuffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>5. websocket\u4f20\u8f93\u534f\u8bae\u5b9e\u73b0<\/h3>\n<h5>5.1 websocket\u5e27\u683c\u5f0f<\/h5>\n<p>  0                   1                   2                   3<br \/>\n      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1<br \/>\n     &#043;-&#043;-&#043;-&#043;-&#043;&#8212;&#8212;-&#043;-&#043;&#8212;&#8212;&#8212;&#8212;-&#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;<br \/>\n     |F|R|R|R| opcode|M| Payload len |    Extended payload length    |<br \/>\n     |I|S|S|S|  (4)  |A|     (7)     |             (16\/64)           |<br \/>\n     |N|V|V|V|       |S|             |   (if payload len&#061;&#061;126\/127)   |<br \/>\n     | |1|2|3|       |K|             |                               |<br \/>\n     &#043;-&#043;-&#043;-&#043;-&#043;&#8212;&#8212;-&#043;-&#043;&#8212;&#8212;&#8212;&#8212;-&#043; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#043;<br \/>\n     |     Extended payload length continued, if payload len &#061;&#061; 127  |<br \/>\n     &#043; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;<br \/>\n     |                               |Masking-key, if MASK set to 1  |<br \/>\n     &#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;<br \/>\n     | Masking-key (continued)       |          Payload Data         |<br \/>\n     &#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#043;<br \/>\n     :                     Payload Data continued &#8230;                :<br \/>\n     &#043; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#043;<br \/>\n     |                     Payload Data continued &#8230;                |<br \/>\n     &#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/p>\n<p>rfc6455 5.2\u4ecb\u7ecd\u4e86\u5404\u4e2a\u57df\u7684\u4f5c\u7528&#xff0c;\u5bf9\u5e94\u7684\u5982\u679c\u8981\u5b9e\u73b0\u8be5\u534f\u8bae\u5c31\u8981\u5b9a\u4e49\u76f8\u5173\u7684\u7ed3\u6784\u4f53<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">_nty_ophdr<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> opcode<span class=\"token operator\">:<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><br \/>\n rsv3<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\n rsv2<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\n rsv1<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\n fin<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> payload_length<span class=\"token operator\">:<\/span><span class=\"token number\">7<\/span><span class=\"token punctuation\">,<\/span><br \/>\nmask<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">__attribute__<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>packed<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">_nty_websocket_head_126<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">short<\/span> payload_length<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">char<\/span> mask_key<span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> data<span class=\"token punctuation\">[<\/span><span class=\"token number\">8<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">__attribute__<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>packed<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">_nty_websocket_head_127<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token keyword\">long<\/span> payload_length<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">char<\/span> mask_key<span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> data<span class=\"token punctuation\">[<\/span><span class=\"token number\">8<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">__attribute__<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>packed<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">_nty_websocket_head_127<\/span> nty_websocket_head_127<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">_nty_websocket_head_126<\/span> nty_websocket_head_126<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">_nty_ophdr<\/span> nty_ophdr<span class=\"token punctuation\">;<\/span><\/p>\n<p>__attribute__ ((packed)) \u662f GNU C \u7f16\u8bd1\u5668&#xff08;GCC&#xff09;\u7684\u4e00\u4e2a\u6269\u5c55&#xff0c;\u7528\u4e8e\u544a\u8bc9\u7f16\u8bd1\u5668\u4e0d\u5bf9\u7ed3\u6784\u4f53\u7684\u6210\u5458\u8fdb\u884c\u5185\u5b58\u5bf9\u9f50\u3002\u901a\u5e38&#xff0c;\u7f16\u8bd1\u5668\u4e3a\u4e86\u63d0\u9ad8\u8bbf\u95ee\u6548\u7387&#xff0c;\u4f1a\u6309\u7167\u7279\u5b9a\u7684\u5b57\u8282\u5bf9\u9f50\u89c4\u5219\u6765\u653e\u7f6e\u7ed3\u6784\u4f53\u6210\u5458\u3002\u4f7f\u7528 packed \u5c5e\u6027\u540e&#xff0c;\u7f16\u8bd1\u5668\u4e0d\u4f1a\u5bf9\u9f50\u5b57\u6bb5&#xff0c;\u800c\u662f\u6309\u7167\u5b9a\u4e49\u7684\u987a\u5e8f\u7d27\u51d1\u5730\u5b58\u50a8\u5b83\u4eec&#xff0c;\u8282\u7701\u5185\u5b58\u7a7a\u95f4\u3002<\/p>\n<h5>5.2 \u89e3\u5305\u5ba2\u6237\u7aef\u6570\u636e<\/h5>\n<p>rfc6455 5.3\u89c4\u5b9a\u4e86\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u7aef\u53d1\u9001\u7684\u6570\u636e\u5fc5\u987b\u7ecf\u8fc7\u63a9\u7801\u52a0\u5bc6&#xff0c;\u5176\u539f\u7406\u662f\u75288\u4f4d\u7684mask-key\u5bf9\u539f\u6570\u636e\u4e00\u6b21\u9010\u5b57\u8282\u8fdb\u884c\u5f02\u6216\u64cd\u4f5c&#xff0c;\u8fd9\u6837\u52a0\u5bc6\u548c\u89e3\u5bc6\u7684\u8fc7\u7a0b\u662f\u5b8c\u5168\u4e00\u6837\u7684\u3002<\/p>\n<p>\u5728\u534f\u8bae\u5e27\u4e2dmasking-key\u67094\u5b57\u8282&#xff0c;\u534f\u8bae\u89c4\u5b9a&#xff0c;\u5bf9payload[i]\u5bf9\u5e94\u7684maskkey\u4e3amasking-key[i mod 4]&#xff0c;\u8fd9\u6837\u5c31\u53ef\u4ee5\u5199\u51fa\u5176\u52a0\u89e3\u5bc6\u7b97\u6cd5\u4e86&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">demask<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>data<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">int<\/span> len<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>mask<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>i <span class=\"token operator\">&lt;<\/span> len<span class=\"token punctuation\">;<\/span>i <span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token operator\">&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">^&#061;<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span>mask<span class=\"token operator\">&#043;<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token operator\">%<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u6837\u5bf9\u4e8e\u670d\u52a1\u7aef\u7684\u89e3\u5305\u64cd\u4f5c&#xff0c;\u5c31\u662f\u89e3\u5bc6payload&#xff0c;\u62ff\u5230\u539f\u6570\u636e\u3002<\/p>\n<p><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">decode_packet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>stream<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>mask<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> length<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>nty_ophdr <span class=\"token operator\">*<\/span>hdr <span class=\"token operator\">&#061;<\/span>  <span class=\"token punctuation\">(<\/span>nty_ophdr<span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>stream<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>data <span class=\"token operator\">&#061;<\/span> stream <span class=\"token operator\">&#043;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>nty_ophdr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> size <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> start <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/char mask[4] &#061; {0};<\/span><br \/>\n<span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>hdr<span class=\"token operator\">-&gt;<\/span>payload_length <span class=\"token operator\">&amp;<\/span> <span class=\"token number\">0x7F<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">126<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>nty_websocket_head_126 <span class=\"token operator\">*<\/span>hdr126 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>nty_websocket_head_126<span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>data<span class=\"token punctuation\">;<\/span><br \/>\nsize <span class=\"token operator\">&#061;<\/span> hdr126<span class=\"token operator\">-&gt;<\/span>payload_length<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">;<\/span>i <span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nmask<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> hdr126<span class=\"token operator\">-&gt;<\/span>mask_key<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>start <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>hdr<span class=\"token operator\">-&gt;<\/span>payload_length <span class=\"token operator\">&amp;<\/span> <span class=\"token number\">0x7F<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">127<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>nty_websocket_head_127 <span class=\"token operator\">*<\/span>hdr127 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>nty_websocket_head_127<span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>data<span class=\"token punctuation\">;<\/span><br \/>\nsize <span class=\"token operator\">&#061;<\/span> hdr127<span class=\"token operator\">-&gt;<\/span>payload_length<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">;<\/span>i <span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nmask<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> hdr127<span class=\"token operator\">-&gt;<\/span>mask_key<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>start <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">14<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nsize <span class=\"token operator\">&#061;<\/span> hdr<span class=\"token operator\">-&gt;<\/span>payload_length<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">memcpy<\/span><span class=\"token punctuation\">(<\/span>mask<span class=\"token punctuation\">,<\/span> data<span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nstart <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token operator\">*<\/span>ret <span class=\"token operator\">&#061;<\/span> size<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">demask<\/span><span class=\"token punctuation\">(<\/span>stream<span class=\"token operator\">&#043;<\/span>start<span class=\"token punctuation\">,<\/span> size<span class=\"token punctuation\">,<\/span> mask<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">return<\/span> stream <span class=\"token operator\">&#043;<\/span> start<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>5.3 \u670d\u52a1\u7aef\u53d1\u5305<\/h5>\n<p>\u5bf9\u4e8e\u670d\u52a1\u7aef\u7684\u53d1\u5305\u64cd\u4f5c&#xff0c;\u53ea\u9700\u8981\u586b\u5145\u76f8\u5e94\u7684\u534f\u8bae\u5b57\u6bb5\u5373\u53ef&#xff0c;\u4e0d\u9700\u8981\u63a9\u7801\u52a0\u5bc6\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">encode_packet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>buffer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>mask<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>stream<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> length<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>nty_ophdr head <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\nhead<span class=\"token punctuation\">.<\/span>fin <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\nhead<span class=\"token punctuation\">.<\/span>opcode <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> size <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>length <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">126<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nhead<span class=\"token punctuation\">.<\/span>payload_length <span class=\"token operator\">&#061;<\/span> length<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">memcpy<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>head<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>nty_ophdr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nsize <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>length <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0xffff<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nnty_websocket_head_126 hdr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\nhdr<span class=\"token punctuation\">.<\/span>payload_length <span class=\"token operator\">&#061;<\/span> length<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">memcpy<\/span><span class=\"token punctuation\">(<\/span>hdr<span class=\"token punctuation\">.<\/span>mask_key<span class=\"token punctuation\">,<\/span> mask<span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">memcpy<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>head<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>nty_ophdr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">memcpy<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token operator\">&#043;<\/span><span class=\"token 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