{"id":875,"date":"2022-02-22T15:29:56","date_gmt":"2022-02-22T07:29:56","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=875"},"modified":"2022-06-11T02:45:07","modified_gmt":"2022-06-10T18:45:07","slug":"%e5%ad%97%e8%8a%82%e5%ba%8f-2","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=875","title":{"rendered":"\u7f51\u7edc\u901a\u4fe1\u4e2d\u7684\u5b57\u8282\u5e8f"},"content":{"rendered":"\n<p>\u672c\u4e66 \u300a\u7f51\u7edc\u534f\u8bae\u6808\u5165\u95e8\u300b \u91c7\u7528\u7684\u4ee3\u7801\u662f \u57fa\u4e8e linux \u5185\u6838 4.4.4 \u7248\u672c\u7684\u3002linux \u5185\u6838\u6e90\u7801\u4e0b\u8f7d\u5730\u5740\uff1a <a href=\"https:\/\/mirrors.edge.kernel.org\/pub\/linux\/kernel\/v4.x\/linux-4.4.4.tar.gz\">mirrors.edge.kernel.org<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u9996\u5148\u8bb2\u89e3\u4e00\u4e0b\u4ec0\u4e48\u662f\u5b57\u8282\u5e8f\uff0c\u4e00\u822c\u6559\u79d1\u4e66\u4f1a\u8bf4\uff1a\u5b57\u8282\u5e8f\u662f\u6307\u6570\u636e\u5728\u786c\u4ef6\u4e2d\u7684\u6392\u5e8f\u65b9\u5f0f\u3002<\/p>\n\n\n\n<p>\u4e0a\u9762\u8fd9\u4e2a\u7b54\u6848\uff0c\u5f88\u5168\u9762\uff0c\u5f88\u6b63\u786e\uff0c\u4f46\u662f\u65b0\u4eba\u4f1a\u770b\u5f97\u4e91\u91cc\u96fe\u91cc\u3002<\/p>\n\n\n\n<p>\u6211\u7528\u7b80\u6d01\u7684\u8bed\u8a00\u63cf\u8ff0\u4e00\u4e0b\uff0c\u505a\u5e94\u7528\u5c42\u5f00\u53d1\u7684\u65f6\u5019\uff0c\u7ecf\u5e38\u9047\u5230\u7684\u60c5\u51b5\u662f\uff0c\u4e00\u4e2a\u6570\u636e\u7c7b\u578b\uff0c\u4e00\u4e2a\u53d8\u91cf\uff0c\u5728\u5185\u5b58\u4e2d\u7684\u6392\u5217\u65b9\u5f0f\u3002<\/p>\n\n\n\n<p>\u5185\u5b58\u4e2d\u7684\u6392\u5217\u65b9\u5f0f\u5c31\u662f\u5b57\u8282\u5e8f\uff0c\u5185\u5b58\u662f\u5176\u4e2d\u4e00\u79cd\u786c\u4ef6\uff0c\u8fd8\u6709CPU\uff0cGPU \u4e5f\u662f\u786c\u4ef6\u3002<\/p>\n\n\n\n<p>\u5b57\u8282\u5e8f\u6709\u4e24\u79cd\uff1a<\/p>\n\n\n\n<p>1\uff0c\u5c0f\u7aef\u5b57\u8282\u5e8f\uff0c\u89e3\u6790\u4e00\u4e2a <code class=\"prettyprint\" >int<\/code> \u662f\u4ece\u5185\u5b58 \u7684 end \u5730\u5740 \u5f80 start \u5730\u5740\uff0c\u9006\u5411\u56de\u6765\u89e3\u91ca\u7684\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\u4e00\u4e2a \u53d8\u91cf <code class=\"prettyprint\" >int num<\/code> = 0x11223344 \u5360 4\u4e2a\u5b57\u8282\uff0c\u5185\u5b58\u5730\u5740\u662f\uff1a0xcd9f37f7f0\uff0c\u6240\u4ee5 0xcd9f37f7f0 ~ 0xcd9f37f7f3 \u662f <code>num<\/code> \u53d8\u91cf\u7684\u5185\u5b58\u3002<\/p>\n\n\n\n<p>\u90a3\u8fd9\u4e2a4 \u5b57\u8282\u7684\u5185\u5b58\u5b58\u7684\u662f\u4ec0\u4e48\u4fe1\u606f\u5462\uff0c0xcd9f37f7f0 \u662f 0x44\uff0c0xcd9f37f7f1 \u662f 0x33 \uff0c0xcd9f37f7f2 \u662f 0x22 \uff0c0xcd9f37f7f3 \u662f 0x11\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >num<\/code> \u53d8\u91cf\u5728\u5185\u5b58\u91cc\u9762\u662f\u9006\u5411\u5b58\u50a8\u7684\u3002CPU \u8bfb\u53d6 \u5185\u5b58\u6570\u636e\u80af\u5b9a\u662f\u4ece 0xcd9f37f7f0 \u5f00\u59cb\uff0c\u4ece\u5de6\u5f80\u53f3\u8bfb\uff0c\u4f46\u662f\u89e3\u6790\u7684\u65f6\u5019\uff0cCPU \u77e5\u9053 <code>num<\/code> \u662f\u4e00\u4e2a <code>int<\/code>\uff0c\u800c\u4e14\u6392\u5217\u65b9\u5f0f\u662f\u9006\u5411\u7684\uff0cCPU \u5c31\u4f1a\u7528\u9006\u5411\u7684\u65b9\u5f0f\u89e3\u6790\u8fd9\u4e2a <code>int<\/code>\u3002\u5c0f\u7aef\u6bd4\u8f83\u7b26\u5408\u8ba1\u7b97\u673a\u7684\u7535\u8def\u8bbe\u8ba1\u3002<\/p>\n\n\n\n<p>PS: \u56e0\u4e3a\u6211\u4eec\u7ecf\u5e38\u7528\u7684 memory \u5185\u5b58\u67e5\u770b\u5668\uff0c\u90fd\u662f16\u8fdb\u5236\u7684\uff0c\u6240\u4ee5\u4e0a\u9762\u6211\u7684 <code class=\"prettyprint\" >num<\/code> \u91c7\u683716\u8fdb\u5236\u8d4b\u503c\u6cd5\u3002<\/p>\n\n\n\n<p>2\uff0c\u5927\u7aef\u5b57\u8282\u5e8f\uff0c\u89e3\u6790\u4e00\u4e2a <code class=\"prettyprint\" >int<\/code> \u662f\u4ece\u5185\u5b58 \u7684 start \u5730\u5740 \u5f80 end\u5730\u5740\uff0c\u987a\u7740\u89e3\u91ca\u7684\u3002\u7b26\u5408\u4eba\u7c7b\u7684\u9605\u8bfb\u4e60\u60ef\uff0c\u4ece\u5de6\u5f80\u53f3\u770b\u3002<\/p>\n\n\n\n<p>\u81f3\u4e8e\u4e3a\u4ec0\u4e48\u8981\u8bbe\u8ba1\u51fa\u5927\u7aef\u5c0f\u7aef\uff0c\u4e0d\u7edf\u4e00\u7528\u5927\u7aef\uff0c\u63a8\u8350\u770b\u8fd9\u7bc7\u6587\u7ae0 <a href=\"https:\/\/blog.erratasec.com\/2016\/11\/how-to-teach-endian.html#.YhSFjL1ByUk\">\u300aHow to teach endian\u300b<\/a>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u90a3\u5982\u4f55\u67e5\u770b\u81ea\u5df1\u7684\u7535\u8111\u662f \u5927\u7aef\u8fd8\u662f\u5c0f\u7aef\u5b57\u8282\u5e8f\u3002\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"981\" height=\"649\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/02\/zijie-1-1.png\" alt=\"\" class=\"wp-image-879\"\/><\/figure>\n\n\n\n<p>\u4e0a\u56fe \uff0c\u6211\u5b9a\u4e49\u4e86\u4e00\u4e2a <code class=\"prettyprint\" >int num<\/code>\uff0c<code>int<\/code> \u53604\u4e2a\u5b57\u8282\uff0c0x \u662f16\u8fdb\u5236\u5199\u6cd5\uff0c\u6240\u4ee5 11 \u4f1a\u5360\u4e00\u4e2a\u5b57\u8282\uff0c22\uff0c\u5360\u4e00\u4e2a\u5b57\u8282\uff0c\u7c7b\u63a8\u3002<\/p>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u51fa\uff0c<code class=\"prettyprint\" >num<\/code> \u5728\u5185\u5b58\u7684\u5b58\u50a8 \u662f\u9006\u5411\u7684\uff0c\u6240\u4ee5\u6211\u7684 window10 \u7535\u8111\u662f \u5c0f\u7aef\u5b57\u8282\u5e8f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u7136\u540e \u518d\u770b \u6211\u53e6\u4e00\u53f0\u7535\u8111 ubuntu\u7cfb\u7edf\u7684\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1134\" height=\"669\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/02\/zijie-1-2.png\" alt=\"\" class=\"wp-image-876\"\/><\/figure>\n\n\n\n<p>\u5982\u4e0a\u56fe\uff0c\u5f88\u9057\u61be\uff0c\u6211\u7684ubuntu\u4e5f\u662f\u5c0f\u7aef\u5b57\u8282\uff0c\u73b0\u5728\u7684\u7f51\u7edc\u73af\u5883\uff0c\u771f\u4e0d\u597d\u627e\u51fa\u4e00\u53f0\u5927\u7aef\u5b57\u8282\u5e8f\u7684\u673a\u5668\u7ed9\u5927\u5bb6\u6f14\u793a\u3002<\/p>\n\n\n\n<p>\u5224\u65ad\u673a\u5668\u7684\u5b57\u8282\u5e8f\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >#include &lt;stdio.h&gt;\n\u200b\nint main() {\n    int x = 0x1020304;\n    char* p = (char*)&amp;x;\n    puts(p&#091;0] == 1 ? &quot;Big endian&quot; : &quot;Little endian&quot;);\n    return 0;\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u57fa\u4e8e\u4ee5\u4e0a\u80cc\u666f\uff0c\u7535\u8111\u8bbe\u5907\u5206\u4e3a \u5927\u7aef \u5c0f\u7aef\u5b57\u8282\u5e8f\u3002\u6240\u4ee5\u5728\u4e0d\u540c\u4e3b\u673a\u4e4b\u95f4\u7684 \u7f51\u7edc\u901a\u4fe1 \u4e2d\uff0c\u89c4\u5b9a\u4f7f\u7528\u54ea\u79cd\u5b57\u8282\u5e8f\u5c31\u975e\u5e38\u91cd\u8981\u7684\u3002\u8fd9\u4e2a\u7f51\u7edc\u5b57\u8282\u5e8f\u5c31\u662f\u5927\u7aef\u5b57\u8282\u5e8f\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u4f60\u901a\u8fc7 <code class=\"prettyprint\" >wireshark<\/code> \u53ef\u4ee5\u770b\u5230 UDP header\uff0c TCP header\uff0cIP header\uff0c\u91cc\u9762\u7684\u5b57\u6bb5\u90fd\u662f\u5927\u7aef\u6392\u5e8f\u7684\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >servAddr.sin_addr.s_addr = inet_addr(&quot;192.168.0.123&quot;);\nint port = 0x1122;\n\/\/\u6ce8\u610f\u8fd9\u91cc\nservAddr.sin_port = htons(port);<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u662f <a href=\"https:\/\/pan.baidu.com\/s\/1OqFQpAimIZDwmv1ciTTATQ\">udp client<\/a> \u7684\u90e8\u5206\u4ee3\u7801\uff0c\u5b9a\u4e49\u4e86 \u7aef\u53e3\u662f 0x1122\uff0c\u56e0\u4e3a\u6211\u7535\u8111\u662f\u5c0f\u7aef\u5e8f\uff0c\u6240\u4ee5\u5185\u5b58\u6392\u5217\u662f 0x2211\u3002\u4f46\u662f\u7ecf\u8fc7 <code class=\"prettyprint\" >htons()<\/code> \u51fd\u6570\u8f6c\u6362\u4e4b\u540e\uff0c\u5185\u5b58\u6392\u5217\u5c31\u53d8\u6210\u4e86 0x1122\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1098\" height=\"716\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/02\/zijie-1-3.png\" alt=\"\" class=\"wp-image-877\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"822\" height=\"467\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/02\/zijie-1-4.png\" alt=\"\" class=\"wp-image-878\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\uff0c\u6293\u5305\u53ef\u4ee5\u770b\u5230\uff0c\u7aef\u53e3\u53f7\u5b57\u6bb5 \u7684\u5b57\u8282\u6d41\u6392\u5e8f\uff0c\u5c31\u662f 0x11 22\u3002<\/p>\n\n\n\n<p><strong>UDP client \u9879\u76ee\u4e0b\u8f7d\uff1a<a href=\"https:\/\/pan.baidu.com\/s\/1OqFQpAimIZDwmv1ciTTATQ\">\u767e\u5ea6\u7f51\u76d8<\/a>\uff0c\u63d0\u53d6\u7801\uff1a46p0<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u8fd9\u91cc\u6ce8\u610f\uff0c\u867d\u7136 UDP \u8ddf TCP header\uff0c RFC\u6807\u51c6\u89c4\u5b9a\u5fc5\u987b\u662f\u5927\u7aef\u6392\u5217\uff0c\u4f46\u662f TCP body \u91cc\u9762\u7684\u6570\u636e\u662f\u6ca1\u6709\u89c4\u5b9a\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u4f60\u5982\u679c\u57fa\u4e8eTCP \u8bbe\u8ba1\u4e00\u4e2a\u534f\u8bae\uff0c\u4f8b\u5982\u53eb TXP\uff0cTXP \u7684\u6570\u636e\u662f\u5957\u5728 TCP body \u91cc\u7684\uff0cTXP \u5404\u4e2a\u5b57\u6bb5\u7684\u5185\u5b58\u6392\u5217\uff0c\u5230\u5e95\u662f\u5927\u7aef\u8fd8\u662f\u5c0f\u7aef\uff0c\u8fd9\u4e2a\u662f\u7531\u4f60\u81ea\u5df1\u51b3\u5b9a\u7684\uff0c\u901a\u4fe1\u53cc\u65b9\u7ea6\u5b9a\u597d\u4f7f\u7528\u5927\u7aef\u5c31\u7528\u5927\u7aef\uff0c\u7528\u5c0f\u7aef\u5c31\u7528\u5c0f\u7aef\u3002<\/p>\n\n\n\n<p>\u5047\u8bbe \u89c4\u5b9a TXP \u4f7f\u7528\u5c0f\u7aef\uff0c\u524d\u97622\u4e2a\u5b57\u8282\u662f TXP \u534f\u8bae\u7684version\u7248\u672c\u53f7\u3002\u90a3\u4e48\u5927\u7aef\u5e8f\u7684\u673a\u5668 \u5728\u53d1\u9001TXP \u7684 version \u7684\u65f6\u5019\uff0c\u5c31\u9700\u8981\u5148\u628a TXP \u7684 version \u8f6c\u6210\u5c0f\u7aef\uff0c\u518d\u53d1\u9001\u5230\u7f51\u7edc\u91cc\u9762\uff0c\u5c31\u662f\u8bf4 \u8981\u8f6c\u6210\u5c0f\u7aef\u5957\u8fdb\u53bb tcp body\u91cc\u9762\u3002<\/p>\n\n\n\n<p>\u53d1\u9001\u6570\u636e\u7684\u65f6\u5019\u90fd\u662f\u53d1\u9001\u5b57\u8282\u6d41\uff0c\u4ed6\u4e0d\u7ba1\u4ec0\u4e48\u5927\u7aef\u5c0f\u7aef\uff0c\u53d1\u9001\u53ea\u662f\u4ece\u5185\u5b58\u5730\u5740 \u4ece\u5de6\u5f80\u53f3 \u987a\u5e8f\u53d1\uff0c\u53d1\u7684\u7b2c\u4e00\u4e2a\u5b57\u8282\u662f 0xcd9f37f7f0 \u7684\u5185\u5bb9\uff0c\u7b2c\u4e8c\u4e2a\u5b57\u8282\u662f 0xcd9f37f7f1\u3002<\/p>\n\n\n\n<p>\u7136\u540e\u5bf9\u9762\u673a\u5668\u63a5\u53d7\u7f51\u7edc\u5b57\u8282\u6d41\uff0c\u4e5f\u662f\u4ece\u524d\u5230\u540e\u6536\uff0c\u4e5f\u4e0d\u7ba1\u5927\u7aef\u5c0f\u7aef\uff0c\u7b2c\u4e00\u4e2a\u6536\u5230\u7684\u5b57\u8282\u662f 0xcd9f37f7f0 \u7684\u5185\u5bb9\uff0c\u7c7b\u63a8\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\uff0c\u5927\u5c0f\u7aef\u5b57\u8282\u5e8f\uff0c\u53ea\u6709\u5728\u89e3\u6790\u6570\u636e\u7684\u65f6\u5019\u624d\u53c8\u7528\u5230\uff0c\u5982\u679c\u4e0d\u89e3\u6790\u6570\u636e\uff0c\u90a3\u6bb5\u6570\u636e\u5c31\u662f\u4e00\u6bb5\u5b57\u8282\u6d41\uff0c\u4e0d\u77e5\u9053\u6bcf\u4e2a\u5b57\u6bb5\u662f\u4ec0\u4e48\u7c7b\u578b\uff0c\u5360\u591a\u5c11\u5b57\u8282\uff0c\u600e\u4e48\u6392\u5217\uff0c\u8fd9\u4e9b\u4e8b\u60c5\u90fd\u662f\u89e3\u6790\u7684\u65f6\u5019\u505a\u7684\u3002<\/p>\n\n\n\n<p>\u5047\u8bbe\u5bf9\u9762\u673a\u5668\u662f\u5927\u7aef\uff0c\u5c31\u9700\u8981\u628a version \u7684 2 \u5b57\u8282\u5185\u5b58\uff0c\u91cd\u65b0\u6392\u5e8f\u6210\u5927\u7aef\uff0c\u5728\u8d4b\u503c\u6216\u8005\u62f7\u8d1d\u5185\u5b58\u7ed9 <code class=\"prettyprint\" >int version<\/code>\uff0c\u56e0\u4e3a\u7f51\u7edc\u4f20\u8f93\u662f\u5c0f\u7aef\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u5bf9\u9762\u673a\u5668\u662f\u5c0f\u7aef\uff0c\u7f51\u7edc\u4f20\u8f93\u89c4\u5b9a\u4e86 TXP \u534f\u8bae\u662f\u5c0f\u7aef\uff0c\u90a3 2 \u5b57\u8282\u7684\u5185\u5b58\u53ef\u4ee5\u76f4\u63a5\u8d4b\u503c \u7ed9 <code class=\"prettyprint\" >int version<\/code> \uff0c\u4e0d\u9700\u8981\u8f6c\u6362\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u518d\u6269\u5c55\u4e00\u4e2a\u77e5\u8bc6\uff0c\u5982\u679c\u4f60\u57fa\u4e8e IP \u534f\u8bae\uff0c\u5f00\u53d1\u4e86\u4e00\u4e2a IXP \u534f\u8bae \u5957\u5728 IP body \u91cc\u9762\uff0c\u8fd9\u4e2a IXP \u534f\u8bae\u662f\u5927\u7aef\u8fd8\u662f\u5c0f\u7aef\uff0c\u4e5f\u662f\u4f60\u81ea\u5df1\u51b3\u5b9a\u7684\uff0cRFC \u6807\u51c6\u53ea\u662f\u89c4\u5b9a\u4e86 IP header \u5fc5\u987b\u662f\u5927\u7aef\u5b57\u8282\uff0c\u6ca1\u89c4\u5b9a IP body \u662f\u4ec0\u4e48\u6392\u5e8f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u7efc\u4e0a\u6240\u8ff0\uff0c\u6211\u4eec\u7f16\u7a0b\u65f6\u5019\u7ecf\u5e38\u7528\u7684 <code class=\"prettyprint\" >inet_addr()<\/code> , <code>htons()<\/code>\uff0c\u5e72\u7684\u6d3b\uff0c\u5c31\u662f\u628a TCP \u7684header \uff0cUDP \u7684header \u8f6c\u6210\u5927\u7aef\u5b57\u8282\u5e8f\uff0c\u518d\u53d1\u9001\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >struct sockaddr_in servaddr;\nmemset(&amp;servaddr,0,sizeof(servaddr));\nservaddr.sin_family = AF_INET;\nservaddr.sin_port = htons(5188);\nservaddr.sin_addr.s_addr = inet_addr(&quot;192.168.0.123&quot;);<\/code><\/pre>\n\n\n\n<p>\u4f46\u662f\u5927\u5bb6\u6709\u6ca1\u6ce8\u610f\u5230 \u5728\u505a UDP\uff0cTCP \u7f16\u7a0b\u7684\u65f6\u5019\uff0c\u7ecf\u5e38\u7528\u7684 <code class=\"prettyprint\" >recvfrom()<\/code>\uff0c<code>recv()<\/code>\uff0c<code>send()<\/code>\uff0c<code>write()<\/code> \u51fd\u6570\u5c31\u6ca1\u6709\u5b57\u8282\u5e8f\u8f6c\u6362\u7684\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p>\u662f\u4e0d\u662f <code class=\"prettyprint\" >send()<\/code> \u5185\u90e8\u5c01\u88c5\u4e86\u5b57\u8282\u5e8f\u8f6c\u6362\u903b\u8f91\uff1f<\/p>\n\n\n\n<p>\u5176\u5b9e\u4e0d\u662f\uff0c\u4e0a\u9762\u8bf4\u4e86\uff0cRFC \u53ea\u662f\u89c4\u5b9a\u4e86 TCP header \u662f\u5927\u7aef\uff0c\u6ca1\u89c4\u5b9a TCP body \u662f\u5927\u7aef\u8fd8\u662f\u5c0f\u7aef\uff0c\u800c <code class=\"prettyprint\" >send()<\/code> \u5e72\u7684\u6d3b\uff0c\u5c31\u662f\u586b\u5145\u5185\u5b58\u6570\u636e\u8fdb\u53bb TCP \u7684body\u91cc\u9762\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5 <code class=\"prettyprint\" >send()<\/code> \u4e0d\u9700\u8981\u505a\u5b57\u8282\u5e8f\u8f6c\u6362\u3002<\/p>\n\n\n\n<p>\u518d\u91cd\u590d\u4e00\u4e2a\u91cd\u70b9\u3002<\/p>\n\n\n\n<p>\u53d1\u9001\u6570\u636e\u53ea\u7ba1\u53d1\u9001\uff0c\u4ed6\u4e0d\u7ba1\u4ec0\u4e48\u5927\u7aef\u5c0f\u7aef\uff0c\u76f4\u63a5\u4ece\u5185\u5b58\u5730\u5740 \u4ece\u5de6\u5f80\u53f3 \u987a\u5e8f\u53d1\uff0c\u53d1\u7684\u7b2c\u4e00\u4e2a\u5b57\u8282\u662f 0xcd9f37f7f0 \u7684\u5185\u5bb9\uff0c\u7b2c\u4e8c\u4e2a\u5b57\u8282\u662f 0xcd9f37f7f1\uff0c\u7c7b\u63a8\u3002<\/p>\n\n\n\n<p>\u63a5\u53d7\u6570\u636e\u53ea\u7ba1\u63a5\u53d7\uff0c\u4ed6\u4e5f\u4e0d\u7ba1\u4ec0\u4e48\u5927\u7aef\u5c0f\u7aef\uff0c\u76f4\u63a5\u4ece\u524d\u5230\u540e\u6536\u6570\u636e\uff0c\u4e00\u4e2a\u6536\u5230\u7684\u5b57\u8282\u662f 0xcd9f37f7f0 \u7684\u5185\u5bb9\uff0c\u7b2c\u4e8c\u4e2a\u5b57\u8282\u662f 0xcd9f37f7f1\uff0c\u7c7b\u63a8\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >recvfrom()<\/code> \u62ff\u5230 body \u7684\u5b57\u8282\u6d41\u5185\u5b58\u6570\u636e\u4e4b\u540e\uff0c\u600e\u4e48\u89e3\u6790\u662f\u4e0a\u5c42\u5e94\u7528\u81ea\u5df1\u7684\u4e8b\u60c5\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>TCP header\uff0cUDP header\uff0cIP header \u7684\u5b57\u8282\u5e8f\u8f6c\u6362\uff0c\u89e3\u6790\uff0c\u662f\u5185\u6838\u5e2e\u4f60\u505a\u4e86\uff0c\u6240\u4ee5\u4e0d\u592a\u5bb9\u6613\u6ce8\u610f\u5230\uff0c\u4f46\u662f body \u91cc\u9762\u7684\u89e3\u6790\u8981\u4f60\u81ea\u5df1\u641e\u3002<\/p>\n\n\n\n<p>\u76f8\u5173\u9605\u8bfb\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li><a href=\"http:\/\/c.biancheng.net\/cpp\/html\/3047.html\">\u300asocket\u7f51\u7edc\u5b57\u8282\u5e8f\u4ee5\u53ca\u5927\u7aef\u5e8f\u5c0f\u7aef\u5e8f\u300b<\/a><\/li><li><a href=\"https:\/\/www.ruanyifeng.com\/blog\/2016\/11\/byte-order.html\">\u300a\u7406\u89e3\u5b57\u8282\u5e8f\u300b<\/a><\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u7531\u4e8e\u7b14\u8005\u7684\u6c34\u5e73\u6709\u9650\uff0c \u52a0\u4e4b\u7f16\u5199\u7684\u540c\u65f6\u8fd8\u8981\u53c2\u4e0e\u5f00\u53d1\u5de5\u4f5c\uff0c\u6587\u4e2d\u96be\u514d\u4f1a\u51fa\u73b0\u4e00\u4e9b\u9519\u8bef\u6216\u8005\u4e0d\u51c6\u786e\u7684\u5730\u65b9\uff0c\u6073\u8bf7\u8bfb\u8005\u6279\u8bc4\u6307\u6b63\u3002\u5982\u679c\u8bfb\u8005\u6709\u4efb\u4f55\u5b9d\u8d35\u610f\u89c1\uff0c\u53ef\u4ee5\u52a0\u6211\u5fae\u4fe1 Loken1\u3002QQ\uff1a2338195090\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u4e66 \u300a\u7f51\u7edc\u534f\u8bae\u6808\u5165\u95e8\u300b \u91c7\u7528\u7684\u4ee3\u7801\u662f \u57fa\u4e8e linux \u5185\u6838 4.4.4 \u7248\u672c\u7684\u3002linux \u5185\u6838\u6e90\u7801\u4e0b\u8f7d\u5730 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-875","post","type-post","status-publish","format-standard","hentry","category-protocol-primer"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u7f51\u7edc\u901a\u4fe1\u4e2d\u7684\u5b57\u8282\u5e8f - \u5f26\u5916\u4e4b\u97f3<\/title>\n<meta name=\"description\" content=\"\u7f51\u7edc\u901a\u4fe1\u4e2d\u7684\u5b57\u8282\u5e8f\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.xianwaizhiyin.net\/?p=875\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u7f51\u7edc\u901a\u4fe1\u4e2d\u7684\u5b57\u8282\u5e8f - \u5f26\u5916\u4e4b\u97f3\" \/>\n<meta property=\"og:description\" content=\"\u7f51\u7edc\u901a\u4fe1\u4e2d\u7684\u5b57\u8282\u5e8f\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.xianwaizhiyin.net\/?p=875\" \/>\n<meta property=\"og:site_name\" content=\"\u5f26\u5916\u4e4b\u97f3\" \/>\n<meta property=\"article:published_time\" content=\"2022-02-22T07:29:56+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-06-10T18:45:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/02\/zijie-1-1.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"loken\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 \u5206\" \/>\n<script 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