{"id":844,"date":"2012-06-28T02:45:53","date_gmt":"2012-06-27T18:45:53","guid":{"rendered":"http:\/\/blog.dynox.cn\/?p=844"},"modified":"2017-10-19T00:08:16","modified_gmt":"2017-10-18T16:08:16","slug":"%e7%a6%bb%e5%a5%87%e4%ba%8b%e4%bb%b6%e8%96%84%e4%b9%8birp%e6%ad%bb%e4%ba%a1%e6%9c%aa%e9%81%82","status":"publish","type":"post","link":"https:\/\/blog.dynox.cn\/?p=844","title":{"rendered":"\u79bb\u5947\u4e8b\u4ef6\u8584\u4e4bIrp\u6b7b\u4ea1\u672a\u9042"},"content":{"rendered":"

\u767d\u5929\u5728\u5916\u9762\u8017\u4e86\u4e00\u6574\u5929\uff0c\u548c\u5404\u8272\u670b\u53cb\u4eec\u8ba8\u8bba\u4e86\u4e00\u6574\u5929\u7684\u65b0\u516c\u53f8\u521d\u521b\u3001\u7ecf\u8425\u3001\u8d26\u52a1\u3001\u7a0e\u6536\u7b49\u76f8\u5173\u7684\u95ee\u9898\uff0c\u7adf\u4e5f\u86ee\u6709\u5174\u81f4\uff0c\u4e5f\u8d39\u4e86\u76f8\u5f53\u7684\u53e3\u6c34\uff0c\u7b49\u56de\u5230\u5bb6\u65f6\u95f4\u5df2\u5f88\u665a\u4e86\uff0c\u53ef\u7cbe\u795e\u5374\u8fd8\u662f\u5f02\u5e38\u5174\u594b\uff0c\u53ea\u5f97\u722c\u8d77\u6765\u627e\u70b9\u4e8b\u6253\u53d1\u4e00\u4e0b\u8fc7\u5269\u7684\u7cbe\u529b\uff0c\u7b2c\u4e00\u76f4\u89c9\u4e0a\u4fbf\u60f3\u5230\u4e86\u524d\u9635\u5b50\u66fe\u9047\u5230\u7684\u4e00\u4e2a\u7a0d\u8bb8\u79bb\u5947\u7684\u95ee\u9898\u3002<\/font><\/p>

\u5185\u5bb9\u4e0a\u53ef\u63a5\u627f\u4ee5\u524d\u7684\u4e00\u7bc7\u65e5\u5fd7\u300a<\/font>\u79bb\u5947\u6b7b\u4ea1\u4e8b\u4ef6\u8584\u4e4bCoCreate\u7bc7<\/font><\/a>\u300b\uff0c\u4e8e\u662f\u7ee7\u7eed\u53d6\u9898\u300a\u79bb\u5947\u4e8b\u4ef6\u8584\u300b\u3002\u7ec6\u8282\u5982\u4e0b\uff1a<\/font><\/p>

\u9a71\u52a8\u7a0b\u5e8f\u4e2d\u8981\u8f6c\u5411IRP_MJ_DIRECTORY_CONTROL\/IRP_MN_QUERY_DIRECTORY\uff0c\u5373Directory Enumeration\u64cd\u4f5c\uff0c\u4ee5\u65b9\u4fbf\u5904\u7406\u6b64\u76ee\u5f55\u4e0b\u6240\u6709\u7684\u6587\u4ef6\u9879\u3002<\/font><\/p>

\u7531\u4e8e\u4f1a\u6d89\u53ca\u6587\u4ef6I\/O\u64cd\u4f5c\uff0c\u4e0d\u5f97\u4e0d\u5c06\u64cd\u4f5c\u79fb\u81f3\u7cfb\u7edf\u7ebf\u7a0b\u4e2d\u6765\u505a\uff08\u81f3\u4e8e\u4e3a\u4ec0\u4e48\uff0c\u8bf7\u8bfb\u8005\u81ea\u5df1\u601d\u8003\uff09\uff0c\u6240\u4ee5\u5728\u7528\u6237\u8bf7\u6c42\u7ebf\u7a0b\u4e2d\u4e0d\u5f97\u4e0d\u5c06\u539fIrp\u8bf7\u6c42\u7684\u5b8c\u6210\u5ef6\u540e\uff08pending\uff09\uff0c\u51fd\u6570\u539f\u578b\u53ef\u7b80\u5316\u6210\u5982\u4e0b\u4e8c\u4e2a\u51fd\u6570\uff1a<\/font><\/p>

\/* \u7528\u6237\u7ebf\u7a0b\u73af\u5883\uff1a\u76f4\u63a5\u5904\u7406 IRP_MJ_DIR_CTRL \/ IRP_MN_QUERY_DIRECTORY *\/ NTSTATUS MyQueryDirectory(DevObj, Irp)<\/font><\/p>

{<\/font><\/p>

        \u2026\u2026
        MyQueueToSystemThread(DevObj, Irp);
        return STATUS_PENDING:<\/font><\/p>

}<\/font><\/p>

\/* \u7cfb\u7edf\u7ebf\u7a0b\uff0c\u7528\u4ee5\u5904\u7406\u9762\u5411\u65b0\u8def\u5f84(Dcb)\u7684IRP_MN_QUEYR_DIRECTORY\u64cd\u4f5c *\/
<\/font>NTSTATUS MySystemThreadHandler(DevObj, Irp)<\/p>

{
        PIRP newIrp = IoAllocateIrp(newDevObj);
        \u2026\u2026
        IoCallDriver(newDevObj, newIrp);
        KeWaitForSingleObject(\u2026):<\/p>

        \/* \u5904\u7406\u8fd4\u56de\u7684\u76ee\u5f55\u9879 *\/
        \u2026\u2026
        \/* \u5b8c\u6210\u539f\u7528\u6237\u7684IRP\u8bf7\u6c42 *\/
       IoCompleteRequest(irp, IO_NO_INCREMENT);<\/p>

}<\/p>

\u4ee3\u7801\u5728\u903b\u8f91\u4e0a\u5e76\u6ca1\u6709\u95ee\u9898\uff0cMySystemThreadHandler()\u6b63\u786e\u83b7\u53d6\u76ee\u5f55\u9879\u5185\u5bb9\u5e76\u5b9e\u65bd\u5bf9\u76ee\u6807\u9879\u7684\u9010\u4e00\u68c0\u67e5\uff0c\u4e4b\u540e\u518d\u5b8c\u6210\u7528\u6237\u6240\u53d1\u7684Irp\u8bf7\u6c42\uff0cIrp\u7684\u72b6\u6001\u88ab\u7cfb\u7edf(I\/O Manager)\u4fee\u6539\u4e3a\u5b8c\u6210\u72b6\u6001\uff0c\u6b64\u8fc7\u7a0b\u4e2d\u5e76\u6ca1\u6709\u5f02\u5e38\u3002\u4f46\u6700\u65e9\u53d1\u51faIRP_MJ_DIR_CTRL \/ IRP_MN_QUERY_DIRECTORY\u8bf7\u6c42\u7684\u7528\u6237\u7ebf\u7a0b\u5374\u88ab\u6c38\u8fdc\u5730\u6302\u8d77\u6765\u4e86\uff0c\u539fIrp\u5185\u5bb9\u4f9d\u7136\u6709\u6548\uff0c\u867d\u7136\u5176\u72b6\u6001\u5df2\u88ab\u6807\u8bb0\u4e3a\u201c\u5b8c\u6210\u201d\u3002<\/font><\/p>

\u8c03\u8bd5\u53d1\u73b0\uff0c\u7531\u4e8e\u7cfb\u7edf\u7ebf\u7a0b\u4f18\u5148\u7ea7\u7a0d\u9ad8\uff0cMySystemThreadHandler()\u5b8c\u6210Irp\u7684\u64cd\u4f5c\u7adf\u7136\u5148\u4e8eMyQueryDirectory()\u8fd4\u56de\u81f3I\/O Manager\u3002<\/font><\/p>

\u6267\u884c\u987a\u5e8f\u5982\u4e0b\uff1a
<\/font>\u65f6\u95f41\uff1aMyQueryDirectory() \u6dfb\u52a0\u4e00\u4e2a\u65b0\u4efb\u52a1\u81f3\u7cfb\u7edf\u7ebf\u7a0b\u961f\u5217
\u65f6\u95f42\uff1aMyQueryDirectory() \u88ab\u7cfb\u7edf\u6302\u8d77\u4e86
\u65f6\u95f43\uff1a\u7cfb\u7edf\u7ebf\u7a0b\u6267\u884cMySystemThreadHandler()\u6765\u5904\u7406\u65f6\u523b\u65f6\u95f41\u6240\u6dfb\u52a0\u7684\u4efb\u52a1
\u65f6\u95f44\uff1aMySystemThreadHandler()\u6267\u884c\u5b8c\u6bd5
\u65f6\u95f45\uff1a\u539f\u7528\u6237\u7ebf\u7a0bMyQueryDirectory()\u88ab\u5524\u9192\uff0c\u5e76\u8fd4\u56deSTATUS_PENDING\u7ed9I\/O Manager<\/font><\/p>

\u770b\u5230\u6b64\u5e8f\u5217\uff0c\u5bf9\u4e8e\u719f\u6089Irp\u64cd\u4f5c\u89c4\u5219\u7684\u5f00\u53d1\u8005\u6765\u8bf4\uff0c\u95ee\u9898\u5df2\u7ecf\u660e\u4e86\uff1a\u663e\u7136\u662f\u5bf9\u6b64Irp\u7684\u7b2c\u4e8c\u9636\u6bb5\u7528\u6237\u7ebf\u7a0b\u73af\u5883\u76f8\u5173\u7684\u5904\u7406\u6ca1\u6709\u8fdb\u884c(Stage 2)\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u6dfb\u52a0Kernel Apc\u7684\u90e8\u5206\u88ab\u8df3\u8fc7\u4e86\u3002<\/font><\/p>

\u4e00\u822cIrp\u7684\u5b8c\u6210\u8981\u7ecf\u8fc7\u4e24\u4e2a\u8fc7\u7a0b\uff08\u53ef\u53c2\u89c1\u672c\u6587\u672b\u6240\u9644\u6587\u6863\u94fe\u63a5\uff09\uff1a
Stage 1: IofCompleteRequest(): \u5b8c\u6210\u4e0e\u8bf7\u6c42\u7ebf\u7a0b\u73af\u5883\u65e0\u5173\u7684\u64cd\u4f5c
Stage 2: IopCompleteRequest(): \u4e0eKernel Apc\u4e2d\u6267\u884c\uff0c\u7528\u4ee5\u5b8c\u6210\u4e0e\u8bf7\u6c42\u7ebf\u7a0b\u76f8\u5173\u7684\u64cd\u4f5c<\/font><\/p>

\u4e4b\u6240\u4ee5Stage 2\u7684IopCompleteRequest\u4f1a\u88ab\u8df3\u8fc7\uff0c\u6709\u4e24\u65b9\u9762\u7684\u539f\u56e0\uff1a<\/font><\/p>

  1. Windows\u5185\u6838\u5728\u5904\u7406IRP_MJ_DIR_CTRL\/IRP_MN_QUERY_DIRECTORY\u8bf7\u6c42\u65f6\u4f1a\u9ed8\u8ba4\u52a0\u4e0a\u6807\u5fd7\u4f4dIRP_DEFER_IO_COMPLETION\u3002\u636e\u6211\u6240\u77e5\uff0c\u4ec5\u5bf9DeviceIoControl\u64cd\u4f5c\u4e0d\u52a0\u6b64\u6807\u5fd7\u3002\u5f53\u6b64\u6807\u5fd7\u4f4d\u88ab\u8bbe\u7f6e\u7684\u540c\u65f6\uff0c\u5982\u679cIrp\u7684Pending\u4f4d\u6ca1\u6709\u8bbe\u7f6e\uff0cIoCompleteRequest()(\u6b64\u51fd\u6570\u4f1a\u8c03\u7528IofCompleteRequest())\u5219\u4f1a\u76f4\u63a5\u8fd4\u56de\uff0c\u4ece\u9762\u4e0d\u5728\u7ee7\u7eed\u5904\u7406\u7b2c\u4e8c\u9636\u6bb5\uff08stage 2\uff09\u3002<\/font><\/li>
  2. \u539f\u7528\u6237\u7ebf\u7a0bIoCallDriver()\u8fd4\u56de\u4e4b\u540e\uff0c\u7531\u4e8e\u8fd4\u56de\u503c\u4e3aSTATUS_PENDING\uff0cI\/O Manager\u5c06\u4e0d\u5728\u8c03\u7528IopCompleteRequest()<\/font><\/li> <\/ol>

    \u6240\u4ee5\u4e8c\u8005\u540c\u65f6\u8df3\u8fc7Stage 2\uff0c\u5bfc\u81f4Irp\u7684Stage 2\u5904\u7406\u4e0d\u4f1a\u518d\u6709\u673a\u4f1a\u6267\u884c\uff0c\u4ece\u800c\u539f\u7528\u6237\u7ebf\u7a0b\u4e5f\u5f97\u4e0d\u5230\u88ab\u5524\u9192\u7684\u673a\u4f1a\u4e86\u3002<\/font><\/p>

    \u89e3\u51b3\u529e\u6cd5\u5374\u662f\u5f02\u5e38\u7b80\u5355\uff0c\u5728MyQueryDirectory()\u8c03\u7528IoCallDriver()\u4e4b\u524d\uff0c\u6216MySystemThreadHandler()\u8c03\u7528IoCompleteRequest()\u4e4b\u524d\u5c06Irp\u8bbe\u4e3aPendingReturened\u975e\u72b6\u6001\u5373\u53ef\uff0c\u6b64\u64cd\u4f5c\u7531\u7cfb\u7edf\u652f\u6301\u51fd\u6570IoMarkIrpPending()\u6765\u505a\u7684\u3002<\/font><\/p>

    \u6700\u540e\uff0c\u4e0d\u59a8\u518d\u590d\u4e60\u4e00\u4e0bOSR\u4ecb\u7ecdIrp\u64cd\u4f5c\u7684\u7ecf\u5178\u4e4b\u4f5c\u5427\uff1a\u300a<\/font>Secrets of the Universe Revealed! - How NT Handles I\/O Completion<\/a> <\/b>\u300b<\/font><\/p><\/div>","protected":false},"excerpt":{"rendered":"

    \u767d\u5929\u5728\u5916\u9762\u8017\u4e86\u4e00\u6574\u5929\uff0c\u548c\u5404\u8272\u670b\u53cb\u4eec\u8ba8\u8bba\u4e86\u4e00\u6574\u5929\u7684\u65b0\u516c\u53f8\u521d\u521b\u3001\u7ecf\u8425\u3001\u8d26\u52a1\u3001\u7a0e\u6536\u7b49\u76f8\u5173\u7684\u95ee\u9898\uff0c\u7adf\u4e5f\u86ee\u6709\u5174\u81f4\uff0c\u4e5f\u8d39\u4e86 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[9],"tags":[399,400,401,398,394],"views":3251,"_links":{"self":[{"href":"https:\/\/blog.dynox.cn\/index.php?rest_route=\/wp\/v2\/posts\/844"}],"collection":[{"href":"https:\/\/blog.dynox.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.dynox.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.dynox.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.dynox.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=844"}],"version-history":[{"count":2,"href":"https:\/\/blog.dynox.cn\/index.php?rest_route=\/wp\/v2\/posts\/844\/revisions"}],"predecessor-version":[{"id":1627,"href":"https:\/\/blog.dynox.cn\/index.php?rest_route=\/wp\/v2\/posts\/844\/revisions\/1627"}],"wp:attachment":[{"href":"https:\/\/blog.dynox.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=844"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.dynox.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=844"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.dynox.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}