Archive for the ‘libssh2’ Category

My previous libssh2 talk on video

Saturday, November 14th, 2009

Remember how I mentioned back in August thatI held a libssh2 talk at Slackathon? The other day I recalled that I never saw that video recording so I tracked it down and found it. So while you’re waiting to see the video of my libssh2 or Rockbox talks I did today at FSCONS, you can enjoy a slightly shorter version:

libssh2 Slackathon 2009

My Nordic Free Software Awards 2009 nominees

Friday, September 25th, 2009

Hey, it’s really about time to nominate your favourite Free Software persons and projects from the nordic region for the 2009 awards before the time runs out.

This year, I decided to nominate the following “nordic” heroes:

Simon Josefsson

For his excellent work in GnuTLS, libssh2 and a bunch of other projects.

Henrik Nordström

For his work in the Squid project, and his efforts within IETF and its HTTP related struggles and more.

Björn Stenberg

As the primary founder of the Rockbox project. He started somehting special back in 2001 that now is a huge, thriving and succesful Free Software project.

As you might spot, I favor “doers”. I don’t believe in the concept of “nordic projects” when it comes to free or open software – the entire concept of open and free should mean that projects cross borders and regions.

In fact, it feels so out of the ordinary to think about open source people in a geographical context I find it hard to come up with a lot of names. It would be cool if ohloh had some ways to list people and projects based on where people live.

Then again, if a person from a nordic country moves somewhere else, is he or she still a nordic person? Does it depend on where the person lived during the actual act? Is Linus Torvalds a nordic person since he was born, lived many years and started his big project in Finland?

(yeah I already blogged about this subject but hey, it can’t hurt can it?)

50 hours offline

Wednesday, August 26th, 2009

Several sites in the haxx.se domain and other stuff related to me and my fellows were completely offline for almost 50 hours between August 24th 19:00 UTC and August 26th 20:30 UTC.

The sites affected included the main web sites for the following projects: curl, c-ares, trio, libssh2 and Rockbox. It also affected mailing lists and CVS repositories etc for some of those.

The reason for the outage has been explained by the ISP (Black Internet) to be because of some kind of sabotage. Their explanation given so far (first in Swedish):

Strax efter kl 20 i måndags drabbades Black Internet och Black Internets kunder av ett mycket allvarligt sabotage. Sabotaget gjordes mot flera av våra core-switchar, våra knutpunkter. Detta resulterade i ett mer eller mindre totalt avbrott för oss och våra kunder. Vi har polisanmält händelsen och har ett bra samarbete med dem.

Translated to English (by me) it becomes:

Soon after 8pm on Monday, Black Internet and its customers were struck by a very serious act of sabotage. The sabotage was made against several of our core switches. This resulted in a more or less total disruption of service for us and our customers. We have reported the incident to the police and we have a good cooperation with them.

Do note that you could keep track of this situation by following me on twitter.

It’s good to be back. Let’s hope it’ll take ages until we go away like that again!

Update: according to my sources, someone erased/cleared Black Internet’s core routers and then they learned that they had no working backups so they had to restore everything by hand.

Slacka-fun!

Tuesday, August 18th, 2009

A bunch of the local OpenBSD fans here in Stockholm run this one-day event every year, called Slackathon. I missed it last year, but in 2007 I was there (and I did a little talk about open source management) and this year I was eager to participate again.

This year, the event was scheduled to take place immediately after a bunch of core OpenBSD developers had had their “hackathon f2k9″ in Stockholm, so they could now boast with a series of very well known and very knowledgeable OpenBSD kernel hackers. As I am really not more than a distant observer of the OpenBSD project this of course put the lights on a lot of dusty corners I had no previous idea about. I’m not really a stranger to kernels and kernel hacking in general, and I must confess I had a great time and the team who spoke of various very detailed kernel topics are charismatic and put on a great show.

So I learned about the terrors of the VFS layer and hacking it (and how they’re working on making all the involved caches dynamically sized). I learned how to do active-active syncing  of pf-based firewalls (basically using two independent firewalls in front of something), or at least how the guys made it work fairly well. Or how the pf firewall was optimized to double its forwarding performance. And I got to hear a few wise words from Theo de Raadt and learn not only about their 6 month release schedules but also their plans and ideas around solving problems with livelocking and more. Not to mention the talk about managing physical memory, or the work to get OpenBSD ported to sparc64s with hardware-based virtualization support.

Taken all the hardcore kernel talks into account, I think my own talk on libssh2 (just before dinner) felt like a very light snack to chew and possibly a tiny bit out of the general topic… Anyway, I gave a quick overview of the project, how it started, why it was started, what it is and a bit how it works etc.

The slides from my slackathon talk. I expect to re-use a fair bunch of that, with some improvements and additions, in my libssh2 talk at FSCONS later this year.

Looking forward to Slackathon 2010!

Pictures from Slackathon 2009 by Vladimir Bogodist.

Me in front of the projector screen doing libssh2 talk

libssh2 1.2 near you!

Monday, August 10th, 2009

After what feels like ages (roughly four months), we’ve managed to cram out yet another release from the libssh2 project. This time the primary new features are around the known host support but as usual we’ve also squashed a bunch of bugs along the way.

Get your own piece of the action from www.libssh2.org.

libssh2

libssh2 at Slackathon 2009

Monday, August 3rd, 2009

I’m scheduled to do a talk about libssh2 on the Slackathon 2009 meeting at Stockholm University, August 15th 2009. The talk will be held in English. See you!

libssh2

I host www.libssh2.org

Friday, July 31st, 2009

Sara Golemon, the founder and former maintainer of libssh2, pointed over the main site www.libssh2.org to my server the other day and now my previously unofficial libssh2 web site suddenly turned out to be the only and official one.

The plan is now to get the web contents push into a separate git repo to allow all libssh2′ers to modify it.

I’m also open and interested in feedback and ideas on how to improve the web site in whatever kind of way you think. Consider the current site mostly a placeholder for the info we have. How can we make it better?

libssh2

libssh2 vs libssh

Sunday, June 14th, 2009

There are only two open source libraries for SSH that I am aware of. At least that are at the fundamental layer, written in C.

I researched the SSH library market years ago when I stuck with libssh2 as the one I thought was most promising, and since then I and others have taken it much further. The lib that I didn’t go with at that time, confusingly enough named libssh, recently came out with a new release.

Since there is now clearly two active open source SSH libraries it feels like we should help our users and potential newcomers by explaining how our projects and libraries differ. As a little teaser: one of the libraries turned out more than twice as fast as the other in my test…

While I admit to not having actually used libssh for real, I’ve read the docs and I’ve tried it a little bit. My take at a comparison is now online at:

http://www.libssh2.org/libssh2-vs-libssh.html

I will highly appreciate your feedback and additional things that differ between the two! The list isn’t really much to boast about as it currently looks!

Adding known hosts support

Monday, May 4th, 2009

… to libcurl and libssh2!

I’m about to start this little mini adventure, so if you’re one of the guys out there who’s been looking forward to be able to do even more (Open)SSH-like things with curl and libcurl when we use SCP and SFTP then consider this a little notification to start listening!

This will require improvements and changes in both projects, and funnily enough I’m already involved knee-deep in both so that shouldn’t cause any problems. I do however greatly appreciate feedback and reviews of my pending implementation proposals! I want this done in a way that benefits many and that isn’t too likely to break at least within the nearest future.

Ok, enough of that. Stand by for posts to the mailing lists. I’ll start off with the libcurl one which will thus be a slightly higher level API for all this. I’ll update this blog post later on to feature direct links to my proposals. Please consider posting responses to the suggestions to the appropriate mailing list!

The libcurl proposal

The first mail to libssh2-devel

libssh2 1.1

Thursday, April 2nd, 2009

I’m happy to announce that we now have a version 1.1 of libssh2 released! Noticeable changes this time include:

  • Downloads using SCP or SFTP are now significantly faster
  • Added a Libtool -export-symbols-regex flag to reduce the number of exported symbols in shared libraries.
  • Added a bunch of new man pages and renamed some of the previous ones
  • Enhanced download performance
  • Made libssh2_scp_recv() and libssh2_scp_send() deal with spaces in filenames
  • Fixed the bad randomness and off-by-one in libssh2_channel_x11_req_ex()
  • Added libssh2_version()
  • Fixed libssh2_channel_direct_tcpip_ex() to not fail when called a second time
  • Fixed libssh2_channel_write_ex problems in blocking situations
  • ‘make check’ runs fine on cygwin
  • Added libssh2_channel_receive_window_adjust2() and deprecated  libssh2_channel_receive_window_adjust()
  • better socket error handling internally on win32
  • libssh2 now always set the socket non-blocking internally and deals with the interface as blocking or non-blocking set by libssh2_session_set_blocking.

The library is rapidly maturing and is getting really usable. I’m happy to see that there’s a community slowly building up around this and I’m also grateful for my sponsor paying for parts of the fixes that contribute to make this release the best ever in libssh2’s history.

libssh2