Difference between pages "Google Chrome" and "File:5-Nexus4-RemoveScrews.jpg"

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Google Chrome is a [[Web Browser|web browser]] developed by Google Inc.
 
  
== Configuration ==
 
The Google Chrome configuration can be found in the '''Preferences''' file.
 
 
On Linux
 
<pre>
 
/home/$USER/.config/google-chrome/Default/Preferences
 
</pre>
 
 
On MacOS-X
 
<pre>
 
/Users/$USER/Library/Application Support/Google/Chrome/Default/Preferences
 
</pre>
 
 
On Windows XP
 
<pre>
 
C:\Documents and Settings\%USERNAME%\Local Settings\Application Data\Google\Chrome\User Data\Default\Preferences
 
</pre>
 
 
On Windows Vista and later
 
<pre>
 
C:\Users\%USERNAME%\AppData\Local\Google\Chrome\User Data\Default\Preferences
 
</pre>
 
 
Or for '''Chromium'''
 
 
On Linux
 
<pre>
 
/home/$USER/.config/chromium/Default/Preferences
 
</pre>
 
 
On MacOS-X
 
<pre>
 
/Users/$USER/Library/Application Support/Chromium/Default/Preferences
 
</pre>
 
 
On Windows XP
 
<pre>
 
C:\Documents and Settings\%USERNAME%\Local Settings\Application Data\Chromium\User Data\Default\Preferences
 
</pre>
 
 
On Windows Vista and later
 
<pre>
 
C:\Users\%USERNAME%\AppData\Local\Chromium\User Data\Default\Preferences
 
</pre>
 
 
=== Plugins ===
 
 
Information about plugins can be found under the "plugins section" of the Preferences file.
 
 
=== DNS Prefetching ===
 
 
DNS is prefetched for related sites, e.g. links on the page.
 
This behavior is controlled by the setting "Predict network actions to improve page load performance", which is enabled by default.
 
 
If enabled the Preferences file contains:
 
<pre>
 
  "dns_prefetching": {
 
      "enabled": true,
 
</pre>
 
 
If disabled the Preferences file contains:
 
<pre>
 
  "dns_prefetching": {
 
      "enabled": false,
 
</pre>
 
 
== Start-up DNS queries ==
 
 
When Chrome starts it queries for several non-existing hostnames that consists of a 10 random characters, E.g.
 
<pre>
 
ttrgoiknff.mydomain.com
 
bxjhgftsyu.mydomain.com
 
yokjbjiagd.mydomain.com
 
</pre>
 
 
This is used to determine if your ISP is hijacking NXDOMAIN results [http://www.google.com/support/forum/p/Chrome/thread?tid=3511015c72a7b314&hl=en].
 
 
== Disk Cache ==
 
The Google Chrome disk cache can be found in:
 
 
On Linux
 
<pre>
 
/home/$USER/.config/google-chrome/Default/Application Cache/Cache/
 
</pre>
 
 
On MacOS-X
 
<pre>
 
/Users/$USER/Caches/Google/Chrome/Default/Cache/
 
</pre>
 
 
On Windows XP
 
<pre>
 
C:\Documents and Settings\%USERNAME%\Local Settings\Application Data\Google\Chrome\User Data\Cache\
 
</pre>
 
 
On Windows Vista and later
 
<pre>
 
C:\Users\%USERNAME%\AppData\Local\Google\Chrome\User Data\Default\Cache\
 
</pre>
 
 
The Chrome Cache contains different files with the following file names:
 
* index
 
* data_#; where # contains a decimal digit.
 
* f_######; where # contains a hexadecimal digit.
 
 
For more info see Chrome developers site [http://www.chromium.org/developers/design-documents/network-stack/disk-cache].
 
 
== History ==
 
Chrome stores the history of visited sites in a file named '''History'''. This file uses the [[SQLite database format]].
 
 
The '''History''' file can be found in same location as the '''Preferences''' file.
 
 
There is also '''Archived History''' that predates information in the '''History''' file.
 
Note that the '''Archived History''' only contains visits.
 
 
=== Timestamps ===
 
The '''History''' file uses the different timestamps.
 
 
==== visits.visit_time ====
 
 
The '''visits.visit_time''' is in (the number of) microseconds since January 1, 1601 UTC
 
 
Some Python code to do the conversion into human readable format:
 
<pre>
 
date_string = datetime.datetime( 1601, 1, 1 )
 
            + datetime.timedelta( microseconds=timestamp )
 
</pre>
 
 
Note that this timestamp is not the same as a Windows filetime which is (the number of) 100 nanoseconds since January 1, 1601 UTC
 
 
==== downloads.start_time ====
 
 
The '''downloads.start_time''' is in (the number of) seconds since January 1, 1970 UTC
 
 
Some Python code to do the conversion into human readable format:
 
<pre>
 
date_string = datetime.datetime( 1970, 1, 1 )
 
            + datetime.timedelta( seconds=timestamp )
 
</pre>
 
 
=== Example queries ===
 
Some example queries:
 
 
To get an overview of the visited sites:
 
<pre>
 
SELECT datetime(((visits.visit_time/1000000)-11644473600), "unixepoch"), urls.url, urls.title FROM urls, visits WHERE urls.id = visits.url;
 
</pre>
 
 
Note that the visit_time conversion looses precision.
 
 
To get an overview of the downloaded files:
 
<pre>
 
SELECT datetime(downloads.start_time, "unixepoch"), downloads.url, downloads.full_path, downloads.received_bytes, downloads.total_bytes FROM downloads;
 
</pre>
 
 
How the information of the downloaded files is stored in the database can vary per version of Chrome as of version 26:
 
<pre>
 
SELECT datetime(((downloads.start_time/1000000)-11644473600), "unixepoch"), downloads.target_path, downloads_url_chains.url, downloads.received_bytes, downloads.total_bytes \
 
FROM downloads, downloads_url_chains WHERE downloads.id = downloads_url_chains.id;
 
</pre>
 
 
== See Also ==
 
 
* [[SQLite database format]]
 
 
== External Links ==
 
* [http://en.wikipedia.org/wiki/Google_Chrome Wikipedia article on Google Chrome]
 
* [http://www.chromium.org/user-experience/user-data-directory The Chromium Projects - User Data Directory]
 
* [http://www.chromium.org/developers/design-documents/network-stack/disk-cache Chrome Disk Cache]
 
* [http://www.google.com/support/forum/p/Chrome/thread?tid=3511015c72a7b314&hl=en Chrome support forum article random 10 character hostnames on startup]
 
* [http://www.useragentstring.com/pages/Chrome/ Chrome User Agent strings]
 
* [http://computer-forensics.sans.org/blog/2010/01/21/google-chrome-forensics/ Google Chrome Forensics] by [[Kristinn Guðjónsson]], January 21, 2010
 
* [http://linuxsleuthing.blogspot.ch/2013/02/cashing-in-on-google-chrome-cache.html?m=1 Cashing in on the Google Chrome Cache], [[John Lehr]], February 24, 2013
 
* [http://www.obsidianforensics.com/blog/history-index-files-removed-from-chrome/ History Index files removed from Chrome v30], by Ryan Benson, October 2, 2013
 
* [https://hindsight-internet-history.googlecode.com/files/Evolution_of_Chrome_Databases.png Evolution of Chrome Databases], by Ryan Benson, November 12, 2013
 
 
== Tools ==
 
=== Open Source ===
 
* [https://code.google.com/p/hindsight-internet-history/ hindsight-internet-history]
 
 
[[Category:Applications]]
 
[[Category:Web Browsers]]
 

Latest revision as of 14:09, 6 December 2013