blog/index.html

   1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
   2           "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
   3 <html xmlns="http://www.w3.org/1999/xhtml" dir="ltr">
   4   <head>
   5     <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
   6     <title>Petter Reinholdtsen</title>
   7     <link rel="stylesheet" type="text/css" media="screen" href="http://people.skolelinux.org/pere/blog/style.css" />
   8     <link rel="stylesheet" type="text/css" media="screen" href="http://people.skolelinux.org/pere/blog/vim.css" />
   9     <link rel="alternate" title="RSS Feed" href="http://people.skolelinux.org/pere/blog/index.rss" type="application/rss+xml" />
  10   </head>
  11   <body>
  12     <div class="title">
  13  <h1>
  14      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  15
  16  </h1>
  17
  18 </div>
  19
  20
  21
  22     <div class="entry">
  23       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Why_is_your_site_not_using_Content_Security_Policy___CSP_.html">Why is your site not using Content Security Policy / CSP?</a></div>
  24       <div class="date"> 9th December 2018</div>
  25       <div class="body"><p>Yesterday, I had the pleasure of watching on Frikanalen the OWASP
  26 talk by Scott Helme titled
  27 "<a href="https://frikanalen.no/video/626080/">What We’ve Learned From
  28 Billions of Security Reports</a>".  I had not heard of the
  29 <a href="https://en.wikipedia.org/wiki/Content_Security_Policy">Content
  30 Security Policy standard</a> nor its ability to "call home" when a
  31 browser detect a policy breach (I do not follow web page design
  32 development much these days), and found the talk very illuminating.</p>
  33
  34 <p>The mechanism allow a web site owner to use HTTP headers to tell
  35 visitors web browser which sources (internal and external) are allowed to
  36 be used on the web site.  Thus it become possible to enforce a "only
  37 local content" policy despite web designers urge to fetch programs
  38 from random sites on the Internet, like the one
  39 <a href="https://securityaffairs.co/wordpress/68966/hacking/browsealoud-plugin-hack.html">enabling
  40 the attack</a> reported by Scott Helme earlier this year.</p>
  41
  42 <p>Using CSP seem like an obvious thing for a site admin to implement
  43 to take some control over the information leak that occur when
  44 external sources are used to render web pages, it is a mystery more
  45 sites are not using CSP?  It is being
  46 <a href="https://www.w3.org/TR/CSP/">standardized under W3C</a> these
  47 days, and is supposed by most web browsers</p>
  48
  49 <p>I managed to find <a href="https://github.com/mozilla/django-csp">a
  50 Django middleware for implementing CSP</a> and was happy to discover
  51 it was already in Debian.  I plan to use it to add CSP support to the
  52 Frikanalen web site soon.</p>
  53
  54 <p>As usual, if you use Bitcoin and want to show your support of my
  55 activities, please send Bitcoin donations to my address
  56 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
  57 </div>
  58       <div class="tags">
  59
  60
  61         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/standard">standard</a>, <a href="http://people.skolelinux.org/pere/blog/tags/web">web</a>.
  62
  63
  64       </div>
  65     </div>
  66     <div class="padding"></div>
  67
  68     <div class="entry">
  69       <div class="title"><a href="http://people.skolelinux.org/pere/blog/New_and_improved_Frikanalen_Kodi_addon_version_0_0_3.html">New and improved Frikanalen Kodi addon version 0.0.3</a></div>
  70       <div class="date"> 8th November 2018</div>
  71       <div class="body"><p>If you read my blog regularly, you probably know I am involved in
  72 running and developing the <a href="https://frikanalen.no/">Norwegian
  73 TV channel Frikanalen</a>.  It is an open channel, allowing everyone
  74 in Norway to publish videos on a TV channel with national coverage.
  75 You can think of it as Youtube for national television.
  76 In addition to distribution on RiksTV and Uninett, Frikanalen is also
  77 available as a Kodi addon.  The last few days I have updated the code
  78 to add more features.  A
  79 <a href="https://kodi.tv/addon/plugins-video-add-ons/frikanalen-nett-tv">new
  80 and improved version 0.0.3 Frikanalen addon</a> was just made
  81 available via the Kodi repositories.  This new version include a
  82 option to browse videos by category, as well as free text search
  83 in the video archive.  It will now also show the video duration in the
  84 video lists, which were missing earlier.  A new and experimental
  85 link to the HD video stream currently being worked on is provided, for
  86 those that want to see what the <a href="https://casparcg.com/">CasparCG</a>
  87 output look like.  The alternative is the SD video stream, generated
  88 using MLT.  CasparCG is controlled by our
  89 <a href="https://github.com/Frikanalen/mltplayout/">mltplayout
  90 server</a> which instead of talking to mlt is giving PLAY instructions
  91 to the CasparCG server when it is time to start a new program.</p>
  92
  93 <p>By now, you are probably wondering what kind of content is being
  94 played on the channel.  These days, it is filled with technical
  95 presentations like those from <a href="https://www.nuug.no/">NUUG</a>,
  96 <a href="https://www.debconf.org/">Debconf</a>, Makercon, and TED,
  97 but there are also some periods with
  98 <a href="https://www.empo.no/">EMPT TV</a> and
  99 <a href="https://www.p7.no/">P7</a>.
 100
 101 <p>As usual, if you use Bitcoin and want to show your support of my
 102 activities, please send Bitcoin donations to my address
 103 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 104 </div>
 105       <div class="tags">
 106
 107
 108         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen</a>, <a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
 109
 110
 111       </div>
 112     </div>
 113     <div class="padding"></div>
 114
 115     <div class="entry">
 116       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Time_for_an_official_MIME_type_for_patches_.html">Time for an official MIME type for patches?</a></div>
 117       <div class="date"> 1st November 2018</div>
 118       <div class="body"><p>As part of my involvement in
 119 <a href="https://gitlab.com/OsloMet-ABI/nikita-noark5-core">the Nikita
 120 archive API project</a>, I've been importing a fairly large lump of
 121 emails into a test instance of the archive to see how well this would
 122 go.  I picked a subset of <a href="https://notmuchmail.org/">my
 123 notmuch email database</a>, all public emails sent to me via
 124 @lists.debian.org, giving me a set of around 216 000 emails to import.
 125 In the process, I had a look at the various attachments included in
 126 these emails, to figure out what to do with attachments, and noticed
 127 that one of the most common attachment formats do not have
 128 <a href="https://www.iana.org/assignments/media-types/media-types.xhtml">an
 129 official MIME type</a> registered with IANA/IETF.  The output from
 130 diff, ie the input for patch, is on the top 10 list of formats
 131 included in these emails.  At the moment people seem to use either
 132 text/x-patch or text/x-diff, but neither is officially registered.  It
 133 would be better if one official MIME type were registered and used
 134 everywhere.</p>
 135
 136 <p>To try to get one official MIME type for these files, I've brought
 137 up the topic on
 138 <a href="https://www.ietf.org/mailman/listinfo/media-types">the
 139 media-types mailing list</a>.  If you are interested in discussion
 140 which MIME type to use as the official for patch files, or involved in
 141 making software using a MIME type for patches, perhaps you would like
 142 to join the discussion?</p>
 143
 144 <p>As usual, if you use Bitcoin and want to show your support of my
 145 activities, please send Bitcoin donations to my address
 146 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 147 </div>
 148       <div class="tags">
 149
 150
 151         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/standard">standard</a>.
 152
 153
 154       </div>
 155     </div>
 156     <div class="padding"></div>
 157
 158     <div class="entry">
 159       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Measuring_the_speaker_frequency_response_using_the_AUDMES_free_software_GUI___nice_free_software.html">Measuring the speaker frequency response using the AUDMES free software GUI - nice free software</a></div>
 160       <div class="date">22nd October 2018</div>
 161       <div class="body"><p><img src="http://people.skolelinux.org/pere/blog/images/2018-10-22-audmes-measure-speakers.png" align="right" width="40%"/></p>
 162
 163 <p>My current home stereo is a patchwork of various pieces I got on
 164 flee markeds over the years.  It is amazing what kind of equipment
 165 show up there.  I've been wondering for a while if it was possible to
 166 measure how well this equipment is working together, and decided to
 167 see how far I could get using free software.  After trawling the web I
 168 came across an article from DIY Audio and Video on
 169 <a href="https://www.diyaudioandvideo.com/Tutorial/SpeakerResponseTesting/">Speaker
 170 Testing and Analysis</a> describing how to test speakers, and it listing
 171 several software options, among them
 172 <a href="https://sourceforge.net/projects/audmes/">AUDio MEasurement
 173 System (AUDMES)</a>.  It is the only free software system I could find
 174 focusing on measuring speakers and audio frequency response.  In the
 175 process I also found an interesting article from NOVO on
 176 <a href="http://novo.press/understanding-speaker-specifications-and-frequency-response/">Understanding
 177 Speaker Specifications and Frequency Response</a> and an article from
 178 ecoustics on
 179 <a href="https://www.ecoustics.com/articles/understanding-speaker-frequency-response/">Understanding
 180 Speaker Frequency Response</a>, with a lot of information on what to
 181 look for and how to interpret the graphs.  Armed with this knowledge,
 182 I set out to measure the state of my speakers.</p>
 183
 184 <p>The first hurdle was that AUDMES hadn't seen a commit for 10 years
 185 and did not build with current compilers and libraries.  I got in
 186 touch with its author, who no longer was spending time on the program
 187 but gave me write access to the subversion repository on Sourceforge.
 188 The end result is that now the code build on Linux and is capable of
 189 saving and loading the collected frequency response data in CSV
 190 format.  The application is quite nice and flexible, and I was able to
 191 select the input and output audio interfaces independently.  This made
 192 it possible to use a USB mixer as the input source, while sending
 193 output via my laptop headphone connection.  I lacked the hardware and
 194 cabling to figure out a different way to get independent cabling to
 195 speakers and microphone.</p>
 196
 197 <p>Using this setup I could see how a large range of high frequencies
 198 apparently were not making it out of my speakers.  The picture show
 199 the frequency response measurement of one of the speakers.  Note the
 200 frequency lines seem to be slightly misaligned, compared to the CSV
 201 output from the program.  I can not hear several of these are high
 202 frequencies, according to measurement from
 203 <a href="http://freehearingtestsoftware.com">Free Hearing Test
 204 Software</a>, an freeware system to measure your hearing (still
 205 looking for a free software alternative), so I do not know if they are
 206 coming out out the speakers.  I thus do not quite know how to figure
 207 out if the missing frequencies is a problem with the microphone, the
 208 amplifier or the speakers, but I managed to rule out the audio card in my
 209 PC by measuring my Bose noise canceling headset using its own
 210 microphone.  This setup was able to see the high frequency tones, so
 211 the problem with my stereo had to be in the amplifier or speakers.</p>
 212
 213 <p>Anyway, to try to role out one factor I ended up picking up a new
 214 set of speakers at a flee marked, and these work a lot better than the
 215 old speakers, so I guess the microphone and amplifier is OK.  If you
 216 need to measure your own speakers, check out AUDMES.  If more people
 217 get involved, perhaps the project could become good enough to
 218 <a href="https://bugs.debian.org/910876">include in Debian</a>?  And if
 219 you know of some other free software to measure speakers and amplifier
 220 performance, please let me know.  I am aware of the freeware option
 221 <a href="https://www.roomeqwizard.com/">REW</a>, but I want something
 222 that can be developed also when the vendor looses interest.</p>
 223
 224 <p>As usual, if you use Bitcoin and want to show your support of my
 225 activities, please send Bitcoin donations to my address
 226 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 227 </div>
 228       <div class="tags">
 229
 230
 231         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software</a>.
 232
 233
 234       </div>
 235     </div>
 236     <div class="padding"></div>
 237
 238     <div class="entry">
 239       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Web_browser_integration_of_VLC_with_Bittorrent_support.html">Web browser integration of VLC with Bittorrent support</a></div>
 240       <div class="date">21st October 2018</div>
 241       <div class="body"><p>Bittorrent is as far as I know, currently the most efficient way to
 242 distribute content on the Internet.  It is used all by all sorts of
 243 content providers, from national TV stations like
 244 <a href="https://www.nrk.no/">NRK</a>, Linux distributors like
 245 <a href="https://www.debian.org/">Debian</a> and
 246 <a href="https://www.ubuntu.com/">Ubuntu</a>, and of course the
 247 <a href="https://archive.org/">Internet archive</A>.
 248
 249 <p>Almost a month ago
 250 <a href="https://tracker.debian.org/pkg/vlc-plugin-bittorrent">a new
 251 package adding Bittorrent support to VLC</a> became available in
 252 Debian testing and unstable.  To test it, simply install it like
 253 this:</p>
 254
 255 <p><pre>
 256 apt install vlc-plugin-bittorrent
 257 </pre></p>
 258
 259 <p>Since the plugin was made available for the first time in Debian,
 260 several improvements have been made to it.  In version 2.2-4, now
 261 available in both testing and unstable, a desktop file is provided to
 262 teach browsers to start VLC when the user click on torrent files or
 263 magnet links.  The last part is thanks to me finally understanding
 264 what the strange x-scheme-handler style MIME types in desktop files
 265 are used for.  By adding x-scheme-handler/magnet to the MimeType entry
 266 in the desktop file, at least the browsers Firefox and Chromium will
 267 suggest to start VLC when selecting a magnet URI on a web page.  The
 268 end result is that now, with the plugin installed in Buster and Sid,
 269 one can visit any
 270 <a href="https://archive.org/details/CopyingIsNotTheft1080p">Internet
 271 Archive page with movies</a> using a web browser and click on the
 272 torrent link to start streaming the movie.</p>
 273
 274 <p>Note, there is still some misfeatures in the plugin.  One is the
 275 fact that it will hang and
 276 <a href="https://github.com/johang/vlc-bittorrent/issues/13">block VLC
 277 from exiting until the torrent streaming starts</a>.  Another is the
 278 fact that it
 279 <a href="https://github.com/johang/vlc-bittorrent/issues/9">will pick
 280 and play a random file in a multi file torrent</a>.  This is not
 281 always the video file you want.  Combined with the first it can be a
 282 bit hard to get the video streaming going.  But when it work, it seem
 283 to do a good job.</p>
 284
 285 <p>For the Debian packaging, I would love to find a good way to test
 286 if the plugin work with VLC using autopkgtest.  I tried, but do not
 287 know enough of the inner workings of VLC to get it working.  For now
 288 the autopkgtest script is only checking if the .so file was
 289 successfully loaded by VLC.  If you have any suggestions, please
 290 submit a patch to the Debian bug tracking system.</p>
 291
 292 <p>As usual, if you use Bitcoin and want to show your support of my
 293 activities, please send Bitcoin donations to my address
 294 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 295 </div>
 296       <div class="tags">
 297
 298
 299         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
 300
 301
 302       </div>
 303     </div>
 304     <div class="padding"></div>
 305
 306     <div class="entry">
 307       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Release_0_2_of_free_software_archive_system_Nikita_announced.html">Release 0.2 of free software archive system Nikita announced</a></div>
 308       <div class="date">18th October 2018</div>
 309       <div class="body"><p>This morning, the new release of the
 310 <a href="https://gitlab.com/OsloMet-ABI/nikita-noark5-core/">Nikita
 311 Noark 5 core project</a> was
 312 <a href="https://lists.nuug.no/pipermail/nikita-noark/2018-October/000406.html">announced
 313 on the project mailing list</a>.  The free software solution is an
 314 implementation of the Norwegian archive standard Noark 5 used by
 315 government offices in Norway.  These were the changes in version 0.2
 316 since version 0.1.1 (from NEWS.md):
 317
 318 <ul>
 319   <li>Fix typos in REL names</li>
 320   <li>Tidy up error message reporting</li>
 321   <li>Fix issue where we used Integer.valueOf(), not Integer.getInteger()</li>
 322   <li>Change some String handling to StringBuffer</li>
 323   <li>Fix error reporting</li>
 324   <li>Code tidy-up</li>
 325   <li>Fix issue using static non-synchronized SimpleDateFormat to avoid
 326       race conditions</li>
 327   <li>Fix problem where deserialisers were treating integers as strings</li>
 328   <li>Update methods to make them null-safe</li>
 329   <li>Fix many issues reported by coverity</li>
 330   <li>Improve equals(), compareTo() and hash() in domain model</li>
 331   <li>Improvements to the domain model for metadata classes</li>
 332   <li>Fix CORS issues when downloading document</li>
 333   <li>Implementation of case-handling with registryEntry and document upload</li>
 334   <li>Better support in Javascript for OPTIONS</li>
 335   <li>Adding concept description of mail integration</li>
 336   <li>Improve setting of default values for GET on ny-journalpost</li>
 337   <li>Better handling of required values during deserialisation </li>
 338   <li>Changed tilknyttetDato (M620) from date to dateTime</li>
 339   <li>Corrected some opprettetDato (M600) (de)serialisation errors.</li>
 340   <li>Improve parse error reporting.</li>
 341   <li>Started on OData search and filtering.</li>
 342   <li>Added Contributor Covenant Code of Conduct to project.</li>
 343   <li>Moved repository and project from Github to Gitlab.</li>
 344   <li>Restructured repository, moved code into src/ and web/.</li>
 345   <li>Updated code to use Spring Boot version 2.</li>
 346   <li>Added support for OAuth2 authentication.</li>
 347   <li>Fixed several bugs discovered by Coverity.</li>
 348   <li>Corrected handling of date/datetime fields.</li>
 349   <li>Improved error reporting when rejecting during deserializatoin.</li>
 350   <li>Adjusted default values provided for ny-arkivdel, ny-mappe,
 351    ny-saksmappe, ny-journalpost and ny-dokumentbeskrivelse.</li>
 352   <li>Several fixes for korrespondansepart*.</li>
 353   <li>Updated web GUI:
 354      <ul>
 355        <li>Now handle both file upload and download.</li>
 356        <li>Uses new OAuth2 authentication for login.</li>
 357        <li>Forms now fetches default values from API using GET.</li>
 358        <li>Added RFC 822 (email), TIFF and JPEG to list of possible file formats.</li>
 359      </ul></li>
 360 </ul>
 361
 362 <p>The changes and improvements are extensive.  Running diffstat on
 363 the changes between git tab 0.1.1 and 0.2 show 1098 files changed,
 364 108666 insertions(+), 54066 deletions(-).</p>
 365
 366 <p>If free and open standardized archiving API sound interesting to
 367 you, please contact us on IRC
 368 (<a href="irc://irc.freenode.net/%23nikita">#nikita on
 369 irc.freenode.net</a>) or email
 370 (<a href="https://lists.nuug.no/mailman/listinfo/nikita-noark">nikita-noark
 371 mailing list</a>).</p>
 372
 373 <p>As usual, if you use Bitcoin and want to show your support of my
 374 activities, please send Bitcoin donations to my address
 375 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 376 </div>
 377       <div class="tags">
 378
 379
 380         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug</a>, <a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn</a>, <a href="http://people.skolelinux.org/pere/blog/tags/standard">standard</a>.
 381
 382
 383       </div>
 384     </div>
 385     <div class="padding"></div>
 386
 387     <div class="entry">
 388       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Fetching_trusted_timestamps_using_the_rfc3161ng_python_module.html">Fetching trusted timestamps using the rfc3161ng python module</a></div>
 389       <div class="date"> 8th October 2018</div>
 390       <div class="body"><p>I have  earlier covered the basics of trusted timestamping using the
 391 'openssl ts' client.  See blog post for
 392 <a href="http://people.skolelinux.org/pere/blog/Public_Trusted_Timestamping_services_for_everyone.html">2014</a>,
 393 <a href="http://people.skolelinux.org/pere/blog/syslog_trusted_timestamp___chain_of_trusted_timestamps_for_your_syslog.html">2016</a>
 394 and
 395 <a href="http://people.skolelinux.org/pere/blog/Idea_for_storing_trusted_timestamps_in_a_Noark_5_archive.html">2017</a>
 396 for those stories.  But some times I want to integrate the timestamping
 397 in other code, and recently I needed to integrate it into Python.
 398 After searching a bit, I found
 399 <a href="https://dev.entrouvert.org/projects/python-rfc3161">the
 400 rfc3161 library</a> which seemed like a good fit, but I soon
 401 discovered it only worked for python version 2, and I needed something
 402 that work with python version 3.  Luckily I next came across
 403 <a href="https://github.com/trbs/rfc3161ng/">the rfc3161ng library</a>,
 404 a fork of the original rfc3161 library.  Not only is it working with
 405 python 3, it have fixed a few of the bugs in the original library, and
 406 it has an active maintainer.  I decided to wrap it up and make it
 407 <a href="https://tracker.debian.org/pkg/python-rfc3161ng">available in
 408 Debian</a>, and a few days ago it entered Debian unstable and testing.</p>
 409
 410 <p>Using the library is fairly straight forward.  The only slightly
 411 problematic step is to fetch the required certificates to verify the
 412 timestamp.  For some services it is straight forward, while for others
 413 I have not yet figured out how to do it.  Here is a small standalone
 414 code example based on of the integration tests in the library code:</p>
 415
 416 <pre>
 417 #!/usr/bin/python3
 418
 419 """
 420
 421 Python 3 script demonstrating how to use the rfc3161ng module to
 422 get trusted timestamps.
 423
 424 The license of this code is the same as the license of the rfc3161ng
 425 library, ie MIT/BSD.
 426
 427 """
 428
 429 import os
 430 import pyasn1.codec.der
 431 import rfc3161ng
 432 import subprocess
 433 import tempfile
 434 import urllib.request
 435
 436 def store(f, data):
 437     f.write(data)
 438     f.flush()
 439     f.seek(0)
 440
 441 def fetch(url, f=None):
 442     response = urllib.request.urlopen(url)
 443     data = response.read()
 444     if f:
 445         store(f, data)
 446     return data
 447
 448 def main():
 449     with tempfile.NamedTemporaryFile() as cert_f,\
 450          tempfile.NamedTemporaryFile() as ca_f,\
 451          tempfile.NamedTemporaryFile() as msg_f,\
 452          tempfile.NamedTemporaryFile() as tsr_f:
 453
 454         # First fetch certificates used by service
 455         certificate_data = fetch('https://freetsa.org/files/tsa.crt', cert_f)
 456         ca_data_data = fetch('https://freetsa.org/files/cacert.pem', ca_f)
 457
 458         # Then timestamp the message
 459         timestamper = \
 460             rfc3161ng.RemoteTimestamper('http://freetsa.org/tsr',
 461                                         certificate=certificate_data)
 462         data = b"Python forever!\n"
 463         tsr = timestamper(data=data, return_tsr=True)
 464
 465         # Finally, convert message and response to something 'openssl ts' can verify
 466         store(msg_f, data)
 467         store(tsr_f, pyasn1.codec.der.encoder.encode(tsr))
 468         args = ["openssl", "ts", "-verify",
 469                 "-data", msg_f.name,
 470                 "-in", tsr_f.name,
 471                 "-CAfile", ca_f.name,
 472                 "-untrusted", cert_f.name]
 473         subprocess.check_call(args)
 474
 475 if '__main__' == __name__:
 476    main()
 477 </pre>
 478
 479 <p>The code fetches the required certificates, store them as temporary
 480 files, timestamp a simple message, store the message and timestamp to
 481 disk and ask 'openssl ts' to verify the timestamp.  A timestamp is
 482 around 1.5 kiB in size, and should be fairly easy to store for future
 483 use.</p>
 484
 485 <p>As usual, if you use Bitcoin and want to show your support of my
 486 activities, please send Bitcoin donations to my address
 487 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 488 </div>
 489       <div class="tags">
 490
 491
 492         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet</a>.
 493
 494
 495       </div>
 496     </div>
 497     <div class="padding"></div>
 498
 499     <div class="entry">
 500       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Automatic_Google_Drive_sync_using_grive_in_Debian.html">Automatic Google Drive sync using grive in Debian</a></div>
 501       <div class="date"> 4th October 2018</div>
 502       <div class="body"><p>A few days, I rescued a Windows victim over to Debian.  To try to
 503 rescue the remains, I helped set up automatic sync with Google Drive.
 504 I did not find any sensible Debian package handling this
 505 automatically, so I rebuild the grive2 source from
 506 <a href="http://www.webupd8.org/">the Ubuntu UPD8 PPA</a> to do the
 507 task and added a autostart desktop entry and a small shell script to
 508 run in the background while the user is logged in to do the sync.
 509 Here is a sketch of the setup for future reference.</p>
 510
 511 <p>I first created <tt>~/googledrive</tt>, entered the directory and
 512 ran '<tt>grive -a</tt>' to authenticate the machine/user.  Next, I
 513 created a autostart hook in <tt>~/.config/autostart/grive.desktop</tt>
 514 to start the sync when the user log in:</p>
 515
 516 <p><blockquote><pre>
 517 [Desktop Entry]
 518 Name=Google drive autosync
 519 Type=Application
 520 Exec=/home/user/bin/grive-sync
 521 </pre></blockquote></p>
 522
 523 <p>Finally, I wrote the <tt>~/bin/grive-sync</tt> script to sync
 524 ~/googledrive/ with the files in Google Drive.</p>
 525
 526 <p><blockquote><pre>
 527 #!/bin/sh
 528 set -e
 529 cd ~/
 530 cleanup() {
 531     if [ "$syncpid" ] ; then
 532         kill $syncpid
 533     fi
 534 }
 535 trap cleanup EXIT INT QUIT
 536 /usr/lib/grive/grive-sync.sh listen googledrive 2>&1 | sed "s%^%$0:%" &
 537 syncpdi=$!
 538 while true; do
 539     if ! xhost >/dev/null 2>&1 ; then
 540         echo "no DISPLAY, exiting as the user probably logged out"
 541         exit 1
 542     fi
 543     if [ ! -e /run/user/1000/grive-sync.sh_googledrive ] ; then
 544         /usr/lib/grive/grive-sync.sh sync googledrive
 545     fi
 546     sleep 300
 547 done 2>&1 | sed "s%^%$0:%"
 548 </pre></blockquote></p>
 549
 550 <p>Feel free to use the setup if you want.  It can be assumed to be
 551 GNU GPL v2 licensed (or any later version, at your leisure), but I
 552 doubt this code is possible to claim copyright on.</p>
 553
 554 <p>As usual, if you use Bitcoin and want to show your support of my
 555 activities, please send Bitcoin donations to my address
 556 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 557 </div>
 558       <div class="tags">
 559
 560
 561         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.
 562
 563
 564       </div>
 565     </div>
 566     <div class="padding"></div>
 567
 568     <div class="entry">
 569       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Valutakrambod___A_python_and_bitcoin_love_story.html">Valutakrambod - A python and bitcoin love story</a></div>
 570       <div class="date">29th September 2018</div>
 571       <div class="body"><p>It would come as no surprise to anyone that I am interested in
 572 bitcoins and virtual currencies.  I've been keeping an eye on virtual
 573 currencies for many years, and it is part of the reason a few months
 574 ago, I started writing a python library for collecting currency
 575 exchange rates and trade on virtual currency exchanges.  I decided to
 576 name the end result valutakrambod, which perhaps can be translated to
 577 small currency shop.</p>
 578
 579 <p>The library uses the tornado python library to handle HTTP and
 580 websocket connections, and provide a asynchronous system for
 581 connecting to and tracking several services.  The code is available
 582 from
 583 <a href="http://github.com/petterreinholdtsen/valutakrambod">github</a>.</p>
 584
 585 </p>There are two example clients of the library.  One is very simple and
 586 list every updated buy/sell price received from the various services.
 587 This code is started by running bin/btc-rates and call the client code
 588 in valutakrambod/client.py.  The simple client look like this:</p>
 589
 590 <p><blockquote><pre>
 591 import functools
 592 import tornado.ioloop
 593 import valutakrambod
 594 class SimpleClient(object):
 595     def __init__(self):
 596         self.services = []
 597         self.streams = []
 598         pass
 599     def newdata(self, service, pair, changed):
 600         print("%-15s %s-%s: %8.3f %8.3f" % (
 601             service.servicename(),
 602             pair[0],
 603             pair[1],
 604             service.rates[pair]['ask'],
 605             service.rates[pair]['bid'])
 606         )
 607     async def refresh(self, service):
 608         await service.fetchRates(service.wantedpairs)
 609     def run(self):
 610         self.ioloop = tornado.ioloop.IOLoop.current()
 611         self.services = valutakrambod.service.knownServices()
 612         for e in self.services:
 613             service = e()
 614             service.subscribe(self.newdata)
 615             stream = service.websocket()
 616             if stream:
 617                 self.streams.append(stream)
 618             else:
 619                 # Fetch information from non-streaming services immediately
 620                 self.ioloop.call_later(len(self.services),
 621                                        functools.partial(self.refresh, service))
 622                 # as well as regularly
 623                 service.periodicUpdate(60)
 624         for stream in self.streams:
 625             stream.connect()
 626         try:
 627             self.ioloop.start()
 628         except KeyboardInterrupt:
 629             print("Interrupted by keyboard, closing all connections.")
 630             pass
 631         for stream in self.streams:
 632             stream.close()
 633 </pre></blockquote></p>
 634
 635 <p>The library client loops over all known "public" services,
 636 initialises it, subscribes to any updates from the service, checks and
 637 activates websocket streaming if the service provide it, and if no
 638 streaming is supported, fetches information from the service and sets
 639 up a periodic update every 60 seconds.  The output from this client
 640 can look like this:</p>
 641
 642 <p><blockquote><pre>
 643 Bl3p            BTC-EUR: 5687.110 5653.690
 644 Bl3p            BTC-EUR: 5687.110 5653.690
 645 Bl3p            BTC-EUR: 5687.110 5653.690
 646 Hitbtc          BTC-USD: 6594.560 6593.690
 647 Hitbtc          BTC-USD: 6594.560 6593.690
 648 Bl3p            BTC-EUR: 5687.110 5653.690
 649 Hitbtc          BTC-USD: 6594.570 6593.690
 650 Bitstamp        EUR-USD:    1.159    1.154
 651 Hitbtc          BTC-USD: 6594.570 6593.690
 652 Hitbtc          BTC-USD: 6594.580 6593.690
 653 Hitbtc          BTC-USD: 6594.580 6593.690
 654 Hitbtc          BTC-USD: 6594.580 6593.690
 655 Bl3p            BTC-EUR: 5687.110 5653.690
 656 Paymium         BTC-EUR: 5680.000 5620.240
 657 </pre></blockquote></p>
 658
 659 <p>The exchange order book is tracked in addition to the best buy/sell
 660 price, for those that need to know the details.</p>
 661
 662 <p>The other example client is focusing on providing a curses view
 663 with updated buy/sell prices as soon as they are received from the
 664 services.  This code is located in bin/btc-rates-curses and activated
 665 by using the '-c' argument.  Without the argument the "curses" output
 666 is printed without using curses, which is useful for debugging.  The
 667 curses view look like this:</p>
 668
 669 <p><blockquote><pre>
 670            Name Pair   Bid         Ask         Spr    Ftcd    Age
 671  BitcoinsNorway BTCEUR   5591.8400   5711.0800   2.1%   16    nan     60
 672        Bitfinex BTCEUR   5671.0000   5671.2000   0.0%   16     22     59
 673         Bitmynt BTCEUR   5580.8000   5807.5200   3.9%   16     41     60
 674          Bitpay BTCEUR   5663.2700         nan   nan%   15    nan     60
 675        Bitstamp BTCEUR   5664.8400   5676.5300   0.2%    0      1      1
 676            Bl3p BTCEUR   5653.6900   5684.9400   0.5%    0    nan     19
 677        Coinbase BTCEUR   5600.8200   5714.9000   2.0%   15    nan    nan
 678          Kraken BTCEUR   5670.1000   5670.2000   0.0%   14     17     60
 679         Paymium BTCEUR   5620.0600   5680.0000   1.1%    1   7515    nan
 680  BitcoinsNorway BTCNOK  52898.9700  54034.6100   2.1%   16    nan     60
 681         Bitmynt BTCNOK  52960.3200  54031.1900   2.0%   16     41     60
 682          Bitpay BTCNOK  53477.7833         nan   nan%   16    nan     60
 683        Coinbase BTCNOK  52990.3500  54063.0600   2.0%   15    nan    nan
 684         MiraiEx BTCNOK  52856.5300  54100.6000   2.3%   16    nan    nan
 685  BitcoinsNorway BTCUSD   6495.5300   6631.5400   2.1%   16    nan     60
 686        Bitfinex BTCUSD   6590.6000   6590.7000   0.0%   16     23     57
 687          Bitpay BTCUSD   6564.1300         nan   nan%   15    nan     60
 688        Bitstamp BTCUSD   6561.1400   6565.6200   0.1%    0      2      1
 689        Coinbase BTCUSD   6504.0600   6635.9700   2.0%   14    nan    117
 690          Gemini BTCUSD   6567.1300   6573.0700   0.1%   16     89    nan
 691          Hitbtc+BTCUSD   6592.6200   6594.2100   0.0%    0      0      0
 692          Kraken BTCUSD   6565.2000   6570.9000   0.1%   15     17     58
 693   Exchangerates EURNOK      9.4665      9.4665   0.0%   16 107789    nan
 694      Norgesbank EURNOK      9.4665      9.4665   0.0%   16 107789    nan
 695        Bitstamp EURUSD      1.1537      1.1593   0.5%    4      5      1
 696   Exchangerates EURUSD      1.1576      1.1576   0.0%   16 107789    nan
 697  BitcoinsNorway LTCEUR      1.0000     49.0000  98.0%   16    nan    nan
 698  BitcoinsNorway LTCNOK    492.4800    503.7500   2.2%   16    nan     60
 699  BitcoinsNorway LTCUSD      1.0221     49.0000  97.9%   15    nan    nan
 700      Norgesbank USDNOK      8.1777      8.1777   0.0%   16 107789    nan
 701 </pre></blockquote></p>
 702
 703 <p>The code for this client is too complex for a simple blog post, so
 704 you will have to check out the git repository to figure out how it
 705 work.  What I can tell is how the three last numbers on each line
 706 should be interpreted.  The first is how many seconds ago information
 707 was received from the service.  The second is how long ago, according
 708 to the service, the provided information was updated.  The last is an
 709 estimate on how often the buy/sell values change.</p>
 710
 711 <p>If you find this library useful, or would like to improve it, I
 712 would love to hear from you.  Note that for some of the services I've
 713 implemented a trading API.  It might be the topic of a future blog
 714 post.</p>
 715
 716 <p>As usual, if you use Bitcoin and want to show your support of my
 717 activities, please send Bitcoin donations to my address
 718 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 719 </div>
 720       <div class="tags">
 721
 722
 723         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.
 724
 725
 726       </div>
 727     </div>
 728     <div class="padding"></div>
 729
 730     <div class="entry">
 731       <div class="title"><a href="http://people.skolelinux.org/pere/blog/VLC_in_Debian_now_can_do_bittorrent_streaming.html">VLC in Debian now can do bittorrent streaming</a></div>
 732       <div class="date">24th September 2018</div>
 733       <div class="body"><p>Back in February, I got curious to see
 734 <a href="http://people.skolelinux.org/pere/blog/Using_VLC_to_stream_bittorrent_sources.html">if
 735 VLC now supported Bittorrent streaming</a>.  It did not, despite the
 736 fact that the idea and code to handle such streaming had been floating
 737 around for years.  I did however find
 738 <a href="https://github.com/johang/vlc-bittorrent">a standalone plugin
 739 for VLC</a> to do it, and half a year later I decided to wrap up the
 740 plugin and get it into Debian.  I uploaded it to NEW a few days ago,
 741 and am very happy to report that it
 742 <a href="https://tracker.debian.org/pkg/vlc-plugin-bittorrent">entered
 743 Debian</a> a few hours ago, and should be available in Debian/Unstable
 744 tomorrow, and Debian/Testing in a few days.</p>
 745
 746 <p>With the vlc-plugin-bittorrent package installed you should be able
 747 to stream videos using a simple call to</p>
 748
 749 <p><blockquote><pre>
 750 vlc https://archive.org/download/TheGoat/TheGoat_archive.torrent
 751 </pre></blockquote></p>
 752
 753 </p>It can handle magnet links too.  Now if only native vlc had
 754 bittorrent support.  Then a lot more would be helping each other to
 755 share public domain and creative commons movies.  The plugin need some
 756 stability work with seeking and picking the right file in a torrent
 757 with many files, but is already usable.  Please note that the plugin
 758 is not removing downloaded files when vlc is stopped, so it can fill
 759 up your disk if you are not careful.  Have fun. :)</p>
 760
 761 <p>I would love to get help maintaining this package.  Get in touch if
 762 you are interested.</p>
 763
 764 <p>As usual, if you use Bitcoin and want to show your support of my
 765 activities, please send Bitcoin donations to my address
 766 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 767 </div>
 768       <div class="tags">
 769
 770
 771         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
 772
 773
 774       </div>
 775     </div>
 776     <div class="padding"></div>
 777
 778     <p style="text-align: right;"><a href="index.rss"><img src="http://people.skolelinux.org/pere/blog/xml.gif" alt="RSS feed" width="36" height="14" /></a></p>
 779     <div id="sidebar">
 780
 781
 782
 783 <h2>Archive</h2>
 784 <ul>
 785
 786 <li>2018
 787 <ul>
 788
 789 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/01/">January (1)</a></li>
 790
 791 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/02/">February (5)</a></li>
 792
 793 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/03/">March (5)</a></li>
 794
 795 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/04/">April (3)</a></li>
 796
 797 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/06/">June (2)</a></li>
 798
 799 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/07/">July (5)</a></li>
 800
 801 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/08/">August (3)</a></li>
 802
 803 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/09/">September (3)</a></li>
 804
 805 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/10/">October (5)</a></li>
 806
 807 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/11/">November (2)</a></li>
 808
 809 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/12/">December (1)</a></li>
 810
 811 </ul></li>
 812
 813 <li>2017
 814 <ul>
 815
 816 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
 817
 818 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/02/">February (3)</a></li>
 819
 820 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/03/">March (5)</a></li>
 821
 822 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/04/">April (2)</a></li>
 823
 824 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/06/">June (5)</a></li>
 825
 826 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/07/">July (1)</a></li>
 827
 828 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/08/">August (1)</a></li>
 829
 830 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/09/">September (3)</a></li>
 831
 832 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/10/">October (5)</a></li>
 833
 834 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/11/">November (3)</a></li>
 835
 836 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
 837
 838 </ul></li>
 839
 840 <li>2016
 841 <ul>
 842
 843 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 844
 845 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
 846
 847 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/03/">March (3)</a></li>
 848
 849 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/04/">April (8)</a></li>
 850
 851 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/05/">May (8)</a></li>
 852
 853 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/06/">June (2)</a></li>
 854
 855 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/07/">July (2)</a></li>
 856
 857 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/08/">August (5)</a></li>
 858
 859 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/09/">September (2)</a></li>
 860
 861 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
 862
 863 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 864
 865 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 866
 867 </ul></li>
 868
 869 <li>2015
 870 <ul>
 871
 872 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 873
 874 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 875
 876 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/03/">March (1)</a></li>
 877
 878 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/04/">April (4)</a></li>
 879
 880 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
 881
 882 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/06/">June (4)</a></li>
 883
 884 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
 885
 886 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 887
 888 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 889
 890 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 891
 892 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 893
 894 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 895
 896 </ul></li>
 897
 898 <li>2014
 899 <ul>
 900
 901 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 902
 903 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 904
 905 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 906
 907 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 908
 909 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 910
 911 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 912
 913 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 914
 915 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 916
 917 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 918
 919 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 920
 921 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 922
 923 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 924
 925 </ul></li>
 926
 927 <li>2013
 928 <ul>
 929
 930 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 931
 932 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 933
 934 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 935
 936 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 937
 938 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 939
 940 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 941
 942 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 943
 944 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 945
 946 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 947
 948 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 949
 950 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 951
 952 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 953
 954 </ul></li>
 955
 956 <li>2012
 957 <ul>
 958
 959 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 960
 961 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 962
 963 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 964
 965 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 966
 967 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 968
 969 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 970
 971 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 972
 973 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 974
 975 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 976
 977 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 978
 979 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 980
 981 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 982
 983 </ul></li>
 984
 985 <li>2011
 986 <ul>
 987
 988 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 989
 990 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 991
 992 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 993
 994 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 995
 996 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 997
 998 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 999
1000 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
1001
1002 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
1003
1004 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
1005
1006 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
1007
1008 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
1009
1010 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
1011
1012 </ul></li>
1013
1014 <li>2010
1015 <ul>
1016
1017 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
1018
1019 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
1020
1021 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
1022
1023 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
1024
1025 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
1026
1027 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
1028
1029 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
1030
1031 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
1032
1033 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
1034
1035 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
1036
1037 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
1038
1039 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
1040
1041 </ul></li>
1042
1043 <li>2009
1044 <ul>
1045
1046 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
1047
1048 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
1049
1050 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
1051
1052 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
1053
1054 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
1055
1056 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
1057
1058 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
1059
1060 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
1061
1062 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
1063
1064 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
1065
1066 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
1067
1068 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
1069
1070 </ul></li>
1071
1072 <li>2008
1073 <ul>
1074
1075 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
1076
1077 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
1078
1079 </ul></li>
1080
1081 </ul>
1082
1083
1084
1085 <h2>Tags</h2>
1086 <ul>
1087
1088  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
1089
1090  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
1091
1092  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
1093
1094  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
1095
1096  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (10)</a></li>
1097
1098  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
1099
1100  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
1101
1102  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
1103
1104  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (164)</a></li>
1105
1106  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
1107
1108  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
1109
1110  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
1111
1112  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
1113
1114  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (25)</a></li>
1115
1116  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
1117
1118  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (393)</a></li>
1119
1120  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
1121
1122  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (13)</a></li>
1123
1124  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (32)</a></li>
1125
1126  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
1127
1128  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (19)</a></li>
1129
1130  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
1131
1132  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
1133
1134  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
1135
1136  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (20)</a></li>
1137
1138  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
1139
1140  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
1141
1142  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
1143
1144  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
1145
1146  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
1147
1148  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
1149
1150  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
1151
1152  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (41)</a></li>
1153
1154  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (11)</a></li>
1155
1156  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (299)</a></li>
1157
1158  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (191)</a></li>
1159
1160  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (34)</a></li>
1161
1162  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
1163
1164  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (72)</a></li>
1165
1166  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (107)</a></li>
1167
1168  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
1169
1170  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
1171
1172  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
1173
1174  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
1175
1176  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (10)</a></li>
1177
1178  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
1179
1180  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (6)</a></li>
1181
1182  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
1183
1184  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (55)</a></li>
1185
1186  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
1187
1188  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
1189
1190  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (58)</a></li>
1191
1192  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
1193
1194  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
1195
1196  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (55)</a></li>
1197
1198  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
1199
1200  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
1201
1202  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
1203
1204  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (13)</a></li>
1205
1206  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (70)</a></li>
1207
1208  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
1209
1210  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
1211
1212 </ul>
1213
1214
1215     </div>
1216     <p style="text-align: right">
1217  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
1218 </p>
1219
1220   </body>
1221 </html>