mirror of
https://github.com/CoderSherlock/CoderSherlock.github.io.git
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Optimized UX and fixed bugs
- Added temp logo
- Added favicon
- Enabled Disqus (jekyll.env)
- Changed Home layout
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I"ˆ{"source"=>"/home/pengzhan/Github/CoderSherlock.github.io", "destination"=>"/home/pengzhan/Github/CoderSherlock.github.io/_site", "collections_dir"=>"", "cache_dir"=>".jekyll-cache", "plugins_dir"=>"_plugins", "layouts_dir"=>"_layouts", "data_dir"=>"_data", "includes_dir"=>"_includes", "collections"=>{"posts"=>{"output"=>true, "permalink"=>"/posts/:title"}}, "safe"=>false, "include"=>[".htaccess"], "exclude"=>["CHANGELOG.md", "HOW_TO_RELEASE.md", "Gemfile", "Gemfile.lock", "LICENSE", "README-*.md", "README.md", "gulpfile.js", "jekyll-text-theme.gemspec", "package-lock.json", "package.json", "/docs", "/node_modules", "/screenshots", "/test", "/vendor", ".sass-cache", ".jekyll-cache", "gemfiles", "node_modules", "vendor/bundle/", "vendor/cache/", "vendor/gems/", "vendor/ruby/"], "keep_files"=>[".git", ".svn"], "encoding"=>"utf-8", "markdown_ext"=>"markdown,mkdown,mkdn,mkd,md", "strict_front_matter"=>false, "show_drafts"=>nil, "limit_posts"=>0, "future"=>false, "unpublished"=>false, "whitelist"=>[], "plugins"=>["jekyll-feed", "jekyll-paginate", "jekyll-sitemap", "jemoji"], "markdown"=>"kramdown", "highlighter"=>"rouge", "lsi"=>false, "excerpt_separator"=>"<!--more-->", "incremental"=>false, "detach"=>false, "port"=>"4000", "host"=>"127.0.0.1", "baseurl"=>"", "show_dir_listing"=>false, "permalink"=>"/posts/:title", "paginate_path"=>"/page:num", "timezone"=>"America/New_York", "quiet"=>false, "verbose"=>false, "defaults"=>[{"scope"=>{"path"=>"", "type"=>"posts"}, "values"=>{"layout"=>"article", "sharing"=>true, "license"=>true, "aside"=>{"toc"=>true}, "show_edit_on_github"=>true, "show_subscribe"=>true, "pageview"=>true}}], "liquid"=>{"error_mode"=>"warn", "strict_filters"=>false, "strict_variables"=>false}, "kramdown"=>{"auto_ids"=>true, "toc_levels"=>[1, 2, 3, 4, 5, 6], "entity_output"=>"as_char", "smart_quotes"=>"lsquo,rsquo,ldquo,rdquo", "input"=>"GFM", "hard_wrap"=>false, "guess_lang"=>true, "footnote_nr"=>1, "show_warnings"=>false, "syntax_highlighter"=>"rouge", "syntax_highlighter_opts"=>{:default_lang=>"plaintext", :guess_lang=>true}, "coderay"=>{}}, "text_skin"=>"default", "highlight_theme"=>"default", "url"=>"http://localhost:4000", "title"=>"Stop Talking, Start Doing", "description"=>"My personal blog, with some boring research staff and some tricks I was fancy to. I'll try my best to make this blog fun and useful. Not just a place I complain about all happens in my Lab.\n", "lang"=>"en", "author"=>{"type"=>nil, "name"=>"Pengzhan Hao", "url"=>nil, "avatar"=>"/static/avatar.jpg", "bio"=>nil, "email"=>"haopengzhan@gmail.com", "facebook"=>nil, "twitter"=>nil, "weibo"=>nil, "googleplus"=>nil, "telegram"=>nil, "medium"=>nil, "zhihu"=>nil, "douban"=>nil, "linkedin"=>nil, "github"=>"codersherlock", "npm"=>nil}, "repository"=>"CoderSherlock/CoderSherlock.github.io", "repository_tree"=>"master", "paths"=>{"root"=>nil, "home"=>nil, "archive"=>nil, "rss"=>nil}, "license"=>nil, "toc"=>{"selectors"=>nil}, "mathjax"=>nil, "mathjax_autoNumber"=>nil, "mermaid"=>nil, "chart"=>nil, "paginate"=>8, "sources"=>nil, "sharing"=>{"provider"=>false, "addthis"=>{"id"=>nil}}, "comments"=>{"provider"=>"disqus", "disqus"=>{"shortname"=>"codersherlockblog"}, "gitalk"=>{"clientID"=>nil, "clientSecret"=>nil, "repository"=>nil, "owner"=>nil, "admin"=>nil}, "valine"=>{"app_id"=>nil, "app_key"=>nil, "placeholder"=>nil, "visitor"=>nil, "meta"=>nil}}, "pageview"=>{"provider"=>false, "leancloud"=>{"app_id"=>nil, "app_key"=>nil, "app_class"=>nil}}, "search"=>{"provider"=>"default", "google"=>{"custom_search_engine_id"=>nil}}, "analytics"=>{"provider"=>"google", "google"=>{"tracking_id"=>"UA-82637164-1", "anonymize_ip"=>false}}, "livereload_port"=>35729, "serving"=>true, "watch"=>true}:ET
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I"ý
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I"æ <p>This blog contains only some basic record of my works. For some details, I will write a unique blog just for some specific topics.</p>
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<h1 id="2016-10">2016-10</h1>
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<h2 id="time-experiment-of-rsync">Time Experiment of rsync</h2>
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<p>Patch is based on rsync with version 3.1.2. [<a href="https://download.samba.org/pub/rsync/rsync-3.1.2.tar.gz">Rsync</a>|<a href="/static/2016-10/rsync/rsync-3.1.2-time.patch">Patch</a>]</p>
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<h3 id="how-to-collect-data">How to collect data</h3>
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<p>Basically, everything of transmission time and computation time will be output with overall time will be printed on the console.
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But we also need some bash script to collect data through different size of random size and with different modification through them.</p>
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<ul>
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<li>Start from 8K to 64M, modify at beginning, [<a href="/static/2016-10/rsync/small2Big_change_at_begin.sh">Bash script</a>]</li>
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<li>Start from 8K to 64M, modify at last, [<a href="/static/2016-10/rsync/small2Big_change_at_last.sh">Bash script</a>]</li>
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<li>Start from 8K to 64M, modify at random place with a (slow) python script, [<a href="/static/2016-10/rsync/small2Big_change_at_anyplace.sh">Bash script</a>|<a href="/static/2016-10/rsync/addbyte.py">Python program</a>]</li>
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</ul>
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<h2 id="time-experiment-of-seafile">Time Experiment of seafile</h2>
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<p>Patch is based on seafile 5.1.4. You can find the release from <a href="https://github.com/haiwen/seafile/releases">seafile official repo</a>. You may follow official compile instructions from <a href="https://manual.seafile.com/build_seafile/linux.html">here</a>. [<a href="">Patch <strong>no longer avaiable, new version at following sections</strong></a>]</p>
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<h3 id="how-to-collect-data-1">How to collect data</h3>
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<p>We also need everything be done using scripting. But this time I only design added some distance between two increasing files’ sizes.</p>
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<ul>
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<li>Start from 8K to 16M, 4 times increasing, modify at beginning/ at 1024 different places with python script. [<a href="/static/2016-11/seafile/trans.sh">Bash Script</a>|<a href="/static/2016-11/seafile/addbyte.py">Python program</a>]</li>
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<li>After using this auto testing script, everything of output will be marked in log files of seafile, which located in <strong>~/.ccnet/log/seafile.log</strong></li>
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<li>We need to use this simple awk code and vim operation to extract data.</li>
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</ul>
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<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c"># CDC: content defined chucks</span>
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<span class="c"># HUT: Http upload traffic</span>
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<span class="c"># ALL: overall time of one commit & upload</span>
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<span class="nb">awk</span> <span class="s1">'/CDC|HUT|ALL/ {print $4,$5}'</span> ~/.ccnet/log/seafile.log <span class="o">></span> results.stat
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</code></pre></div></div>
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<h3 id="install-seafile-on-odroid-xu">Install Seafile on odroid xu</h3>
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<p>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 <a href="http://www.hardkernel.com/main/products/prdt_info.php?g_code=G137510300620">odroid xu</a> 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.</p>
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<p>To install a ubuntu with GUI is my all preparation work. I found to way to do this.</p>
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<ul>
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<li>
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<p><a href="http://www.armhf.com/boards/odroid-xu/">armhf</a> is a website for arm-based ubuntu. It has a detailed instruction to follow at <a href="http://www.armhf.com/boards/odroid-xu/odroid-sd-install/">here</a>. 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.</p>
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</li>
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<li>
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<p>Burn images is much easy to install a pre-complied ubuntu system. I found this on odroid xu’s forum, which contains xubuntu image [<a href="http://odroid.in/ubuntu_14.04lts/ubuntu-14.04lts-xubuntu-odroid-xu-20140714.img.xz">download</a>] for odroid xu. With this image, you just need to use dd command to write whole system mirror into sdcard.</p>
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</li>
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</ul>
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<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c"># If .img end with xz, use this command to uncompress first</span>
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unxz ubuntu-14.04lts-xubuntu-odroid-xu-20140714.img.xz
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<span class="c"># Burn image into SD-card</span>
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<span class="nb">sudo dd </span><span class="k">if</span><span class="o">=</span>ubuntu-14.04lts-xubuntu-odroid-xu-20140714.img <span class="nv">of</span><span class="o">=</span>/dev/sdb <span class="nv">bs</span><span class="o">=</span>1M <span class="nv">conv</span><span class="o">=</span>fsync
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<span class="nb">sync</span>
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</code></pre></div></div>
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<h1 id="2016-11">2016-11</h1>
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<h2 id="android-kernel">Android Kernel</h2>
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<h3 id="how-to-build-an-android-kernel">How to build an Android Kernel?</h3>
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<p>Generally, I won’t tell anything in this parts, just mark some related links, and point out some mistakes or error solutions.</p>
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<ul>
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<li>
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<p><a href="http://source.android.com/source/building-kernels.html#figuring-out-which-kernel-to-build">Google Official Guide</a>
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– 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.
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— <a href="https://android.googlesource.com/?format=HTML">ASOP git root</a>, under sub class “/platform/prebuilts/gcc�</p>
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</li>
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<li>
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<p><a href="https://softwarebakery.com/building-the-android-kernel-on-linux">Packing and Flashing a Boot.img</a> <strong>[highly recommend]</strong></p>
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</li>
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</ul>
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<h1 id="2016-12">2016-12</h1>
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<h2 id="android-kernel-1">Android Kernel</h2>
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<h3 id="how-to-compile-with-ftrace">How to compile with ftrace?</h3>
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<p>If we want to debug under android, ftrace is a great tool for working. But, ftrace is not available in android if we used default configure file. Android kernel configuration is in <strong>arch/arm64/kernel/configs</strong>. We need to add few lines under that.</p>
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<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">CONFIG_STRICT_MEMORY_RWX</span><span class="o">=</span>y
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<span class="nv">CONFIG_FUNCTION_TRACER</span><span class="o">=</span>y
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<span class="nv">CONFIG_FUNCTION_GRAPH_TRACER</span><span class="o">=</span>y
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<span class="nv">CONFIG_DYNAMIC_FTRACE</span><span class="o">=</span>y
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<span class="nv">CONFIG_PERSISTENT_TRACER</span><span class="o">=</span>y
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<span class="nv">CONFIG_IRQSOFF_TRACER</span><span class="o">=</span>y
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<span class="nv">CONFIG_PREEMPT_TRACER</span><span class="o">=</span>y
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<span class="nv">CONFIG_SCHED_TRACER</span><span class="o">=</span>y
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<span class="nv">CONFIG_STACK_TRACER</span><span class="o">=</span>y
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</code></pre></div></div>
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<h3 id="how-to-extract-android-images-dump-an-image">How to extract android images: Dump an image</h3>
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<p>If we want to hold a rooted status after flashing boot, we need to extract an image from android devices. We can first use following command to find which blocks belongs to. According to some references, <a href="http://forum.xda-developers.com/showthread.php?t=2450045">this article</a> provide three ways to dump an image, I picked one for easy using.</p>
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<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>adb shell
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<span class="nb">ls</span> <span class="nt">-al</span> /dev/block/platform/<span class="nv">$SOME</span><span class="se">\_</span>DEVICE../../by-name <span class="c"># {Partitions} -> {Device Block}</span>
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<span class="c"># dump file</span>
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su
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<span class="nb">dd </span><span class="k">if</span><span class="o">=</span>/dev/block/mmcblk0p37 <span class="nv">of</span><span class="o">=</span>/sdcard/boot.img
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</code></pre></div></div>
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:ET
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I"ò<p>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.<br />
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My current solution is using AP to forward all SSL traffic to a proxy, <a href="https://www.charlesproxy.com/">charles proxy</a> 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.</p>
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<h3 id="preparations">Preparations</h3>
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<ul>
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<li>Monitor device situation: Linux Machine with wireless adapter</li>
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<li>Download the newest version(4.0.1) of charles</li>
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<li>Target android devices with root privilege</li>
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</ul>
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<h3 id="install-charles-and-configuration">Install Charles and Configuration</h3>
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<ul>
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<li>You have to install charles first. After downloading the charles proxy, you have to unzip it and configure some basic settings.</li>
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</ul>
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<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c"># open charles first</span>
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./bin/charles
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</code></pre></div></div>
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<ul>
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<li>Save charles’ private key and public key</li>
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</ul>
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<p>In Help -> SSL Proxying -> Export Charles Root Certificate and Private Key, enter a password and save the public and private key in *.p12 format.<br />
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You also need to save charles Root Certificate, it also contains in the same menu. For convience, save it as *.pem format.</p>
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<ul>
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<li>Set Proxy and SSL Proxy</li>
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</ul>
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:ET
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