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    <title>Stop Talking, Start Doing - 停止空想，开始行动</title>
    <description>My personal blog, with some boring research staff and some tricks I was fancy to. I&#39;ll try my best to make this blog fun and useful. Not just a place I complain about all happens in my Lab.
</description>
    <link>https://codersherlock.github.com//</link>
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    <pubDate>Thu, 24 Nov 2016 00:06:21 -0500</pubDate>
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      <item>
        <title>Freshman from china ~ 人生修复者</title>
        <description>
</description>
        <pubDate>Wed, 23 Nov 2016 22:58:00 -0500</pubDate>
        <link>https://codersherlock.github.com//archivers/freshman-from-china</link>
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        <category>Nonsense</category>
        
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      <item>
        <title>Some of my previews experiment works</title>
        <description>&lt;h1 id=&quot;time-series&quot;&gt;Time series&lt;/h1&gt;

&lt;h2 id=&quot;section&quot;&gt;2016-10&lt;/h2&gt;

&lt;h3 id=&quot;time-experiment-of-rsync&quot;&gt;Time Experiment of rsync&lt;/h3&gt;

&lt;p&gt;Patch is based on rsync with version 3.1.2. [&lt;a href=&quot;https://download.samba.org/pub/rsync/rsync-3.1.2.tar.gz&quot;&gt;Rsync&lt;/a&gt;|&lt;a href=&quot;/static/2016-10/rsync/rsync-3.1.2-time.patch&quot;&gt;Patch&lt;/a&gt;]&lt;/p&gt;

&lt;h4 id=&quot;how-to-collect-data&quot;&gt;How to collect data&lt;/h4&gt;

&lt;p&gt;Basically, everything of transmission time and computation time will be output with overall time will be printed on the console.&lt;br /&gt;
But we also need some bash script to collect data through different size of random size and with different modification through them.&lt;/p&gt;

&lt;ul&gt;
  &lt;li&gt;Start from 8K to 64M, modify at beginning, [&lt;a href=&quot;/static/2016-10/rsync/small2Big_change_at_begin.sh&quot;&gt;Bash script&lt;/a&gt;]&lt;/li&gt;
  &lt;li&gt;Start from 8K to 64M, modify at last, [&lt;a href=&quot;/static/2016-10/rsync/small2Big_change_at_last.sh&quot;&gt;Bash script&lt;/a&gt;]&lt;/li&gt;
  &lt;li&gt;Start from 8K to 64M, modify at random place with a (slow) python script, [&lt;a href=&quot;/static/2016-10/rsync/small2Big_change_at_anyplace.sh&quot;&gt;Bash script&lt;/a&gt;|&lt;a href=&quot;/static/2016-10/rsync/addbyte.py&quot;&gt;Python program&lt;/a&gt;]&lt;/li&gt;
&lt;/ul&gt;

&lt;h3 id=&quot;time-experiment-of-seafile&quot;&gt;Time Experiment of seafile&lt;/h3&gt;

&lt;p&gt;Patch is based on seafile 5.1.4. You can find the release from &lt;a href=&quot;https://github.com/haiwen/seafile/releases&quot;&gt;seafile official repo&lt;/a&gt;. You may follow official compile instructions from &lt;a href=&quot;https://manual.seafile.com/build_seafile/linux.html&quot;&gt;here&lt;/a&gt;. [&lt;a href=&quot;&quot;&gt;Patch &lt;strong&gt;no longer avaiable, new version at following sections&lt;/strong&gt;&lt;/a&gt;]&lt;/p&gt;

&lt;h4 id=&quot;how-to-collect-data-1&quot;&gt;How to collect data&lt;/h4&gt;

&lt;p&gt;We also need everything be done using scripting. But this time I only design added some distance between two increasing files’ sizes.&lt;/p&gt;

&lt;ul&gt;
  &lt;li&gt;Start from 8K to 16M, 4 times increasing, modify at beginning/ at 1024 different places with python script. [&lt;a href=&quot;/static/2016-11/seafile/trans.sh&quot;&gt;Bash Script&lt;/a&gt;|&lt;a href=&quot;/static/2016-11/seafile/addbyte.py&quot;&gt;Python program&lt;/a&gt;]&lt;/li&gt;
  &lt;li&gt;After using this auto testing script, everything of output will be marked in log files of seafile, which located in &lt;strong&gt;~/.ccnet/log/seafile.log&lt;/strong&gt;&lt;/li&gt;
  &lt;li&gt;We need to use this simple awk code and vim operation to extract data.&lt;/li&gt;
&lt;/ul&gt;

&lt;div class=&quot;highlighter-rouge&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;&lt;span class=&quot;c&quot;&gt;# CDC: content defined chucks&lt;/span&gt;
&lt;span class=&quot;c&quot;&gt;# HUT: Http upload traffic&lt;/span&gt;
&lt;span class=&quot;c&quot;&gt;# ALL: overall time of one commit &amp;amp; upload&lt;/span&gt;
awk &lt;span class=&quot;s1&quot;&gt;&#39;/CDC|HUT|ALL/ {print $4,$5}&#39;&lt;/span&gt; ~/.ccnet/log/seafile.log &amp;gt; results.stat
&lt;/code&gt;&lt;/pre&gt;
&lt;/div&gt;

&lt;h4 id=&quot;install-seafile-on-odroid-xu&quot;&gt;Install Seafile on odroid xu&lt;/h4&gt;

&lt;p&gt;Due to failure of my cross-compile to seafile on android. I used develop board as a replacement experiment platform for ARM-seafile testing. I used a &lt;a href=&quot;http://www.hardkernel.com/main/products/prdt_info.php?g_code=G137510300620&quot;&gt;odroid xu&lt;/a&gt; as hardware standard. Because all I need is an ARM platform, only an ARM-Ubuntu is enough for me. But develop prototype on a board is much fun than coding, I won’t address much this time. But I’ll start a blog telling some really cool stuff I made for a strange aim.&lt;/p&gt;

&lt;p&gt;To install a ubuntu with GUI is my all preparation work. I found to way to do this.&lt;/p&gt;

&lt;ul&gt;
  &lt;li&gt;
    &lt;p&gt;&lt;a href=&quot;http://www.armhf.com/boards/odroid-xu/&quot;&gt;armhf&lt;/a&gt; is a website for arm-based ubuntu. It has a detailed instruction to follow at &lt;a href=&quot;http://www.armhf.com/boards/odroid-xu/odroid-sd-install/&quot;&gt;here&lt;/a&gt;. They also provide ubuntu 12.04/ 14.04 and debian 7.5 to choose. But unfortunately odroid xu’s hdmi output doesn’t supported by ubuntu native firmware. So install ubuntu-desktop might can’t be boot up for video output.&lt;/p&gt;
  &lt;/li&gt;
  &lt;li&gt;
    &lt;p&gt;Burn images is much easy to install a pre-complied ubuntu system. I found this on odroid xu’s forum, which contains xubuntu image [&lt;a href=&quot;http://odroid.in/ubuntu_14.04lts/ubuntu-14.04lts-xubuntu-odroid-xu-20140714.img.xz&quot;&gt;download&lt;/a&gt;] for odroid xu. With this image, you just need to use dd command to write whole system mirror into sdcard.&lt;/p&gt;
  &lt;/li&gt;
&lt;/ul&gt;

&lt;div class=&quot;highlighter-rouge&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;&lt;span class=&quot;c&quot;&gt;# If .img end with xz, use this command to uncompress first&lt;/span&gt;
unxz ubuntu-14.04lts-xubuntu-odroid-xu-20140714.img.xz    
&lt;span class=&quot;c&quot;&gt;# Burn image into SD-card&lt;/span&gt;
sudo dd &lt;span class=&quot;k&quot;&gt;if&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;=&lt;/span&gt;ubuntu-14.04lts-xubuntu-odroid-xu-20140714.img &lt;span class=&quot;nv&quot;&gt;of&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;=&lt;/span&gt;/dev/sdb &lt;span class=&quot;nv&quot;&gt;bs&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;=&lt;/span&gt;1M &lt;span class=&quot;nv&quot;&gt;conv&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;=&lt;/span&gt;fsync
sync
&lt;/code&gt;&lt;/pre&gt;
&lt;/div&gt;

&lt;h2 id=&quot;section-1&quot;&gt;2016-11&lt;/h2&gt;

&lt;h3 id=&quot;android-kernel&quot;&gt;Android Kernel&lt;/h3&gt;

&lt;h4 id=&quot;how-to-build-an-android-kernel&quot;&gt;How to build an Android Kernel?&lt;/h4&gt;

&lt;p&gt;Generally, I won’t tell anything in this parts, just mark some related links, and point out some mistakes or error solutions.&lt;/p&gt;

&lt;ul&gt;
  &lt;li&gt;
    &lt;p&gt;&lt;a href=&quot;http://source.android.com/source/building-kernels.html#figuring-out-which-kernel-to-build&quot;&gt;Google Official Guide&lt;/a&gt;&lt;br /&gt;
– If you don’t have AOSP sources, you have to download prebuilt toolchains which recommended in this guide might not be correct. Use following links to choose your fitting tools.&lt;br /&gt;
— &lt;a href=&quot;https://android.googlesource.com/?format=HTML&quot;&gt;ASOP git root&lt;/a&gt;, under sub class “/platform/prebuilts/gcc”&lt;/p&gt;
  &lt;/li&gt;
  &lt;li&gt;
    &lt;p&gt;&lt;a href=&quot;https://softwarebakery.com/building-the-android-kernel-on-linux&quot;&gt;Packing and Flashing a Boot.img&lt;/a&gt; &lt;strong&gt;[highly recommend]&lt;/strong&gt;&lt;/p&gt;
  &lt;/li&gt;
&lt;/ul&gt;

</description>
        <pubDate>Fri, 28 Oct 2016 12:27:33 -0400</pubDate>
        <link>https://codersherlock.github.com//archivers/some-of-my-previews-exper-work</link>
        <guid isPermaLink="true">https://codersherlock.github.com//archivers/some-of-my-previews-exper-work</guid>
        
        
        <category>Research</category>
        
      </item>
    
      <item>
        <title>Using charles proxy to monitor mobile SSL traffics</title>
        <description>&lt;p&gt;In this blog, I will generally talk about how to use proper tools to monitor SSL traffics of a mobile devices. Currently, I only can dealing with those SSL traffics which use an obviously certification. Some applications may not using system root cert or they doesn’t provide us a method to modify their own certs. For these situation, I still didn’t find a good solutions for it. But I’ll keep updating this if I get one.  &lt;br /&gt;
My current solution is using AP to forward all SSL traffic to a proxy, &lt;a href=&quot;https://www.charlesproxy.com/&quot;&gt;charles proxy&lt;/a&gt; is my first choice (Prof asked). It’s a non-free software which still update new versions now. So mainly, I’ll talk about how to charles SSL proxy.&lt;/p&gt;

&lt;h3 id=&quot;preparations&quot;&gt;Preparations&lt;/h3&gt;
&lt;ul&gt;
  &lt;li&gt;Monitor device situation: Linux Machine with wireless adapter&lt;/li&gt;
  &lt;li&gt;Download the newest version(4.0.1) of charles&lt;/li&gt;
  &lt;li&gt;Target android devices with root privilege&lt;/li&gt;
&lt;/ul&gt;

&lt;h3 id=&quot;install-charles-and-configuration&quot;&gt;Install Charles and Configuration&lt;/h3&gt;

&lt;ul&gt;
  &lt;li&gt;You have to install charles first. After downloading the charles proxy, you have to unzip it and configure some basic settings.&lt;/li&gt;
&lt;/ul&gt;

&lt;div class=&quot;highlighter-rouge&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;&lt;span class=&quot;c&quot;&gt;# open charles first&lt;/span&gt;
./bin/charles  
&lt;/code&gt;&lt;/pre&gt;
&lt;/div&gt;
&lt;ul&gt;
  &lt;li&gt;Save charles’ private key and public key&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;In Help -&amp;gt; SSL Proxying -&amp;gt; Export Charles Root Certificate and Private Key, enter a password and save the public and private key in *.p12 format.  &lt;br /&gt;
You also need to save charles Root Certificate, it also contains in the same menu. For convience, save it as *.pem format.&lt;/p&gt;

&lt;ul&gt;
  &lt;li&gt;Set Proxy and SSL Proxy&lt;/li&gt;
&lt;/ul&gt;
</description>
        <pubDate>Thu, 27 Oct 2016 22:50:33 -0400</pubDate>
        <link>https://codersherlock.github.com//archivers/charles-is-not-a-good-tool</link>
        <guid isPermaLink="true">https://codersherlock.github.com//archivers/charles-is-not-a-good-tool</guid>
        
        
        <category>Network</category>
        
      </item>
    
      <item>
        <title>Stop Talking is the worst title of one blog</title>
        <description>
</description>
        <pubDate>Wed, 26 Oct 2016 22:50:33 -0400</pubDate>
        <link>https://codersherlock.github.com//archivers/hello</link>
        <guid isPermaLink="true">https://codersherlock.github.com//archivers/hello</guid>
        
        
        <category>Nonsense</category>
        
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