{"id":2934,"date":"2011-06-09T16:21:48","date_gmt":"2011-06-09T08:21:48","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=2934"},"modified":"2011-06-13T11:59:43","modified_gmt":"2011-06-13T03:59:43","slug":"tcp%e8%bf%9e%e6%8e%a5%e7%9a%84%e5%bb%ba%e7%ab%8b%e5%92%8c%e7%bb%88%e6%ad%a2","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/2934","title":{"rendered":"TCP\u8fde\u63a5\u7684\u5efa\u7acb\u548c\u7ec8\u6b62"},"content":{"rendered":"

\u5728\u57fa\u4e8eTCP\u7684\u5ba2\u6237\/\u670d\u52a1\u5668\u6a21\u578b\u4e2d\uff0c\u670d\u52a1\u5668\u548c\u5ba2\u6237\u7a0b\u5e8f\u4e4b\u95f4\u901a\u8fc7\u4e00\u7cfb\u5217\u7684socket\u63a5\u53e3\u5f62\u6210TCP\u8fde\u63a5\u3002\u670d\u52a1\u5668\u542f\u52a8\u540e\u7684\u9996\u8981\u5de5\u4f5c\u5c31\u662f\u521b\u5efa\u76d1\u542c\u5957\u63a5\u5b57\uff0c\u76d1\u542c\u5957\u63a5\u5b57\u662f\u901a\u8fc7socket\u3001bind\u548clisten\u4e09\u4e2a\u51fd\u6570\u5b8c\u6210\u7684\u3002\u5728\u8fd9\u4e4b\u540e\uff0c\u76d1\u542c\u5957\u63a5\u5b57\u901a\u8fc7accept\u51fd\u6570\u4e00\u76f4\u5904\u4e8e\u963b\u585e\u72b6\u6001\uff0c\u7b49\u5f85\u5ba2\u6237\u7a0b\u5e8f\u7684\u8fde\u63a5\u8bf7\u6c42\u3002\u5ba2\u6237\u7a0b\u5e8f\u5728\u8fde\u63a5\u81f3\u670d\u52a1\u5668\u4e4b\u524d\uff0c\u5fc5\u987b\u5148\u521b\u5efa\u81ea\u5df1\u7684\u5957\u63a5\u5b57\uff0c\u518d\u901a\u8fc7connect\u51fd\u6570\u8fde\u63a5\u5230\u670d\u52a1\u5668\u3002\u5982\u679c\u4e00\u5207\u987a\u5229\uff0c\u90a3\u4e48\u670d\u52a1\u5668\u548c\u5ba2\u6237\u4e4b\u95f4\u5c31\u5f62\u6210\u4e86\u4e00\u6761TCP\u8fde\u63a5\u3002<\/p>\n

\u4e0a\u8ff0TCP\u8fde\u63a5\u7684\u8fc7\u7a0b\u662f\u4ece\u7f16\u7a0b\u89d2\u5ea6\u89e6\u53d1\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u5c06\u4ece\u7f51\u7edc\u901a\u4fe1\u7684\u89d2\u5ea6\u5206\u6790TCP\u7684\u5efa\u7acb\u548c\u7ec8\u6b62\u8fc7\u7a0b\uff0c\u5e76\u4e14\u7ed3\u5408\u76f8\u5173\u7684socket\u51fd\u6570\u63a5\u53e3\u5206\u6790\u5176\u5efa\u7acb\u548c\u7ec8\u6b62\u8fc7\u7a0b\u4e2d\u5ba2\u6237\u7a0b\u5e8f\u548c\u670d\u52a1\u5668\u72b6\u6001\u7684\u53d8\u5316\u3002<\/p>\n

1.TCP\u7684\u5efa\u7acb<\/h3>\n

TCP\u8fde\u63a5\u5efa\u7acb\u8fc7\u7a0b\u5373\u901a\u5e38\u6211\u4eec\u6240\u8bf4\u7684\u201c\u4e09\u8def\u63e1\u624b\u201d\u3002\u6574\u4e2a\u8fde\u63a5\u8fc7\u7a0b\u662f\u7531\u5ba2\u6237\u7aef\u7684connect\u51fd\u6570\u53d1\u8d77\u7684\uff0c\u5176\u5177\u4f53\u7684\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n

1.\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u5668\u53d1\u9001\u4e00\u4e2aSYN\uff08\u540c\u6b65\uff09\u62a5\u6587\u6bb5\uff0c\u8fd9\u4e2a\u62a5\u6587\u6bb5\u5305\u542b\u4e86\u5ba2\u6237\u7aef\u5c06\u8981\u53d1\u9001\u6570\u636e\u7684\u521d\u59cb\u5e8f\u5217\u53f7\uff0c\u5047\u8bbe\u8be5\u5e8f\u53f7\u4e3aJ\u3002\u8be5SYN\u6bb5\u4e3a\u6574\u4e2aTCP\u8fde\u63a5\u8fc7\u7a0b\u7684\u62a5\u6587\u6bb51\u3002<\/p>\n

2.\u670d\u52a1\u5668\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u4e00\u4e2aSYN\u6bb5\u4f5c\u4e3a\u5bf9\u5ba2\u6237\u7aef\u7684\u5e94\u7b54\uff0c\u8be5\u62a5\u6587\u6bb5\u5305\u542b\u670d\u52a1\u5668\u5728\u6b64\u8fde\u63a5\u4e2d\u5c06\u8981\u53d1\u9001\u6570\u636e\u7684\u8d77\u59cb\u5e8f\u5217\u53f7K\u3002\u8be5SYN\u6bb5\u4e3a\u6574\u4e2aTCP\u8fde\u63a5\u8fc7\u7a0b\u7684\u62a5\u6587\u6bb52\uff1b\u5728\u8be5\u62a5\u6587\u6bb5\u4e2d\u8fd8\u5305\u542b\u670d\u52a1\u5668\u5bf9\u5ba2\u6237\u7aefSYN\u6bb5\u7684\u786e\u8ba4\uff08ACK\uff09\uff0c\u8be5\u786e\u8ba4\u5305\u542b\u7684\u5e8f\u53f7\u4e3aJ+1\uff0c\u8868\u660e\u670d\u52a1\u5668\u671f\u671b\u5ba2\u6237\u7aef\u4e0b\u6b21\u53d1\u9001\u7684\u6570\u636e\u5e8f\u53f7\u662f\u4eceJ+1\u5f00\u59cb\u7684\u3002\u4e5f\u5c31\u662f\u8bf4\u62a5\u6587\u6bb52\u5305\u542b\u670d\u52a1\u5668\u53d1\u9001\u7684SYN\u548c\u670d\u52a1\u5668\u5bf9\u5ba2\u6237SYN\u7684ACK\u3002<\/p>\n

3.\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u5668\u53d1\u9001ACK\u4ee5\u5bf9\u670d\u52a1\u5668SYN\u8fdb\u884c\u786e\u8ba4\uff0c\u8be5\u62a5\u6587\u6bb5\u7684\u5e8f\u53f7\u4e3aK+1\u3002\u8fd9\u662f\u62a5\u6587\u6bb53\u3002<\/p>\n

\u7531\u4e8e\u670d\u52a1\u5668\u5728\u63a5\u6536\u5230\u5ba2\u6237\u7aef\u7684TCP\u8fde\u63a5\u8bf7\u6c42\u4e4b\u524d\u8c03\u7528\u4e86accpet\u51fd\u6570\uff0c\u6240\u4ee5\u4e00\u76f4\u5904\u4e8e\u963b\u585e\u72b6\u6001\u3002\u5f53\u5ba2\u6237\u901a\u8fc7connect\u51fd\u6570\u5411\u670d\u52a1\u5668\u53d1\u9001\u7b2c\u4e00\u4e2aSYN\u6bb5\u65f6\uff0c\u5b83\u6267\u884c\u4e86\u4e3b\u52a8\u6253\u5f00TCP\u8fde\u63a5\u8fd9\u4e2a\u52a8\u4f5c\u3002\u800c\u63a5\u53d7\u8fd9\u4e2aSYN\u7684\u670d\u52a1\u5668\u5219\u6267\u884c\u88ab\u52a8\u6253\u5f00\u52a8\u4f5c\uff0c\u5b83\u5411\u5ba2\u6237\u53d1\u9001SYN\u4ee5\u53caACK\u786e\u8ba4\u3002<\/p>\n

\u63a5\u4e0b\u6765\u6211\u4eec\u4ee5\u4e0a\u6587\u6240\u4e3e\u4f8b\u7684\u56de\u5c04\u5ba2\u6237\/\u670d\u52a1\u5668\u7a0b\u5e8f\u4e3a\u4f8b\uff0c\u8bf4\u660eTCP\u8fde\u63a5\u8fc7\u7a0b\u4e2d\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7684\u72b6\u6001\u53d8\u5316\u3002<\/p>\n

1.\u4ece\u540e\u53f0\u542f\u52a8\u670d\u52a1\u5668\u7a0b\u5e8f\u3002\u901a\u8fc7netstat\u547d\u4ee4\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u5f53\u524d\u670d\u52a1\u5668\u5904\u4e8e\u76d1\u542c\u72b6\u6001\uff0c\u56e0\u6b64\u6b64\u523b\u8fd8\u6ca1\u6709\u4efb\u4f55\u5ba2\u6237\u8bf7\u6c42\u3002
\n\"\"<\/a>
\n\u5728\u672c\u5730\u5730\u5740\u4e00\u680f\u4e2d\uff0cIP\u5730\u5740\u4e3a*\u662f\u56e0\u4e3a\u6211\u4eec\u5728\u7ed1\u5b9a(bind)\u670d\u52a1\u5668\u5957\u63a5\u5b57\u65f6\u4f7f\u7528\u4e86INADDR_ANY\u53c2\u6570\u3002\u7531\u4e8e\u6b64\u523b\u6ca1\u6709\u4efb\u4f55\u5ba2\u6237\u8bf7\u6c42\uff0c\u6240\u4ee5\u5916\u6765\u5730\u5740\u5904\u5747\u4e3a*\u3002<\/p>\n

2\u3002\u8fd0\u884c\u5ba2\u6237\u7a0b\u5e8f\uff0cTCP\u8fde\u63a5\u5efa\u7acb\u3002\u7b2c\u4e00\u6761\u4fe1\u606f\u4e3a\u4e3b\u670d\u52a1\u5668\u8fdb\u7a0b\uff0c\u5b83\u6b64\u523b\u4ecd\u7136\u5904\u4e8e\u76d1\u542c\u72b6\u6001\uff0c\u7b49\u5f85\u5176\u4ed6\u5ba2\u6237\u7a0b\u5e8f\u7684\u8fde\u63a5\u8bf7\u6c42\uff1b\u7b2c\u4e8c\u6761\u4fe1\u606f\u4e3a\u5b50\u670d\u52a1\u5668\u8fdb\u7a0b\uff0c\u5b83\u6b64\u523b\u5df2\u7ecf\u5efa\u7acb\u4e86TCP\u8fde\u63a5\uff0c\u672c\u5730\u7aef\u53e3\u4e3a6666\uff0c\u800c\u5916\u6765\u8fde\u63a5\u7aef\u53e3\u4e3a54260\u3002\u7b2c\u4e09\u6761\u4fe1\u606f\u4e3a\u5ba2\u6237\u5ba2\u6237\u8fdb\u7a0b\uff0c\u4ed6\u6b64\u523b\u4e5f\u5904\u4e8e\u5df2\u5efa\u7acb\u8fde\u63a5\u7684\u72b6\u6001\uff0c\u672c\u5730\u7aef\u53e3\u4e3a54260\uff0c\u800c\u5916\u6765\u7aef\u53e3\u6b63\u597d\u4e3a6666\u3002
\n\"\"<\/a>
\n\u6b64\u523b\uff0c\u6211\u4eec\u5728\u5ba2\u6237\u7aef\u5e76\u6ca1\u6709\u8f93\u5165\u4efb\u4f55\u6570\u636e\uff0c\u56e0\u6b64\u6b64\u523b\u4e3b\u670d\u52a1\u5668\u8fdb\u7a0b\u3001\u5b50\u670d\u52a1\u5668\u8fdb\u7a0b\u548c\u5ba2\u6237\u8fdb\u7a0b\u5747\u5904\u4e8e\u963b\u585e\u72b6\u6001\uff0c\u4f46\u662f\u5176\u963b\u585e\u539f\u56e0\u5374\u4e0d\u540c\u3002\u4e3b\u670d\u52a1\u5668\u8fdb\u7a0b\u662f\u56e0\u4e3a\u7b49\u5f85\uff08accept\uff09\u5176\u4ed6\u5ba2\u6237\u8bf7\u6c42\u800c\u963b\u585e\uff1b\u5b50\u670d\u52a1\u5668\u8fdb\u7a0b\u662f\u56e0\u4e3a\u7b49\u5f85\uff08read()\uff09\u5ba2\u6237\u8fdb\u7a0b\u53d1\u9001\u7684\u6570\u636e\u800c\u963b\u585e\uff1b\u5ba2\u6237\u8fdb\u7a0b\u5219\u662f\u56e0\u4e3a\u7b49\u5f85\u4ece\u6807\u51c6\u8f93\u5165\u8bfb\u53d6\uff08fgets()\uff09\u6570\u636e\u800c\u963b\u585e\u3002\u6211\u4eec\u53ef\u4ee5\u8fdb\u4e00\u6b65\u4f7f\u7528ps\u547d\u4ee4\u67e5\u770b\u4e09\u4e2a\u8fdb\u7a0b\u4e4b\u95f4\u7684\u72b6\u6001\u3002\u5982\u4e0b\uff1a
\n\"\"<\/a>
\n\u5bf9ps\u4f7f\u7528-t\u9009\u9879\u53ef\u4ee5\u67e5\u770b\u6307\u5b9a\u4f2a\u7ec8\u7aef\u4e0b\u7684\u8fdb\u7a0b\uff0c\u800c\u901a\u8fc7-o\u9009\u9879\u5219\u53ef\u4ee5\u8f93\u5165\u6307\u5b9a\u7684\u8fdb\u7a0b\u72b6\u6001\u4fe1\u606f\uff0cWCHAN\u53c2\u6570\u53ef\u4ee5\u8fdb\u7a0b\u7761\u7720\u7684\u539f\u56e0\u3002ps\u7684\u8f93\u51fa\u7ed3\u679c\u548c\u6211\u4eec\u4e0a\u9762\u7684\u5206\u6790\u7684\u7ed3\u679c\u4e00\u81f4\uff0c\u4e09\u4e2a\u8fdb\u7a0b\u786e\u5b9e\u5904\u4e8e\u7761\u7720\u72b6\u6001\uff08S\uff09\u3002\u5f53\u8fdb\u7a0b\u963b\u585e\u4e8eaccept\u6216connect\u65f6\uff0c\u5176\u7761\u7720\u6761\u4ef6\u4e3ainet_csk_wait_for_connect\uff1b\u5f53\u8fdb\u7a0b\u963b\u585e\u4e8e\u5957\u63a5\u5b57\u8f93\u5165\u6216\u8f93\u51fa\u65f6\uff0c\u5176\u7761\u7720\u6761\u4ef6\u4e3ask_wait_data\uff1b\u5f53\u8fdb\u7a0b\u963b\u585e\u4e8e\u7ec8\u7aef\u7684\u8bfb\u64cd\u4f5c\u65f6\uff0c\u5176\u7761\u7720\u6761\u4ef6\u4e3an_tty_read\u3002<\/p>\n

2.TCP\u7684\u7ec8\u6b62<\/h3>\n

\u7531\u4e8eTCP\u8fde\u63a5\u662f\u5168\u53cc\u5de5\u7684\uff0c\u56e0\u6b64\u5fc5\u987b\u5206\u522b\u5173\u95ed\u4e24\u4e2a\u65b9\u5411\u4e0a\u7684\u8fde\u63a5\u3002\u901a\u5e38\u4e00\u4e2aTCP\u8fde\u63a5\u7684\u7ec8\u6b62\u9700\u89814\u4e2a\u5206\u8282\u3002\u6574\u4e2aTCP\u7684\u7ec8\u6b62\u8fc7\u7a0b\u901a\u5e38\u662f\u7531\u5ba2\u6237\u7aef\u7684close\u51fd\u6570\u53d1\u8d77\u7684\u3002<\/p>\n

1.\u5ba2\u6237\u7aef\u8fdb\u7a0b\u8c03\u7528close\u51fd\u6570\u5173\u95ed\u5957\u63a5\u5b57\uff0c\u5b83\u6267\u884c\u4e86\u4e3b\u52a8\u5173\u95edTCP\u8fde\u63a5\uff0c\u8be5\u7aefTCP\u5411\u670d\u52a1\u5668\u53d1\u9001\u4e00\u4e2aFIN\u62a5\u6587\u6bb5\uff08\u62a5\u6587\u6bb51\uff09\uff0c\u8868\u793a\u8be5\u7aef\u7684\u6570\u636e\u5df2\u7ecf\u53d1\u9001\u5b8c\u6bd5\u3002\u5047\u8bbe\u8be5\u62a5\u6587\u6bb5\u7684\u5e8f\u53f7\u4e3aM\u3002<\/p>\n

2.\u670d\u52a1\u5668\u63a5\u6536\u5230\u8fd9\u4e2aFIN\u6bb5\u540e\u6267\u884c\u88ab\u52a8\u5173\u95ed\u3002\u4e3a\u4e86\u786e\u8ba4\u53d7\u5230\u8fd9\u4e2aFIN\uff0c\u670d\u52a1\u5668\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u4e00\u4e2aACK\uff08\u62a5\u6587\u6bb52\uff09\uff0c\u8be5\u786e\u8ba4\u62a5\u6587\u7684\u5e8f\u53f7\u4e3aM+1\u3002\u670d\u52a1\u5668\u63a5\u6536\u4e86\u5ba2\u6237\u7aef\u53d1\u9001\u6765\u7684FIN\u8bf4\u660e\u670d\u52a1\u5668\u5728\u8be5TCP\u8fde\u63a5\u4e0a\u518d\u65e0\u6570\u636e\u53ef\u63a5\u6536\u3002<\/p>\n

3.\u670d\u52a1\u5668\u7a0b\u5e8f\u8c03\u7528close\u5173\u95ed\u5957\u63a5\u5b57\uff0c\u8fd9\u5c06\u5bfc\u81f4\u670d\u52a1\u5668\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u4e00\u4e2aFIN\u62a5\u6587\uff08\u62a5\u6587\u6bb53\uff09\uff0c\u5047\u8bbe\u8be5\u62a5\u6587\u7684\u5e8f\u53f7\u4e3aN\u3002<\/p>\n

4.\u5ba2\u6237\u7aef\u4e3a\u4e86\u786e\u8ba4\u670d\u52a1\u5668\u53d1\u9001\u6765\u7684FIN\u62a5\u6587\uff0c\u5b83\u5411\u670d\u52a1\u5668\u53d1\u9001\u4e00\u4e2aACK\uff08\u62a5\u65874\uff09\uff0c\u8be5\u62a5\u6587\u7684\u5e8f\u53f7\u4e3aN+1\u3002<\/p>\n

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