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July 3rd, 2010
The RH for this week is Password.
This seems fitting since I just changed my passwords myself.
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The Korean incident: tcpwrappers
July 3rd, 2010
I was checking my logs yesterday when I noticed that someone from an IP in
Korea was trying to brute force my pop3 daemon. I noticed after they got
about 6000 attempts in. So I looked at wrapping them with tcpwrappers. The
pop3 daemon on the outside of solarscale.de is Dovecot and they by default
don't have tcp wrappers support. But there is a patch. So I applied it and
noticed that some hunks of the patch failed. Particularely near the configure
scripts so I ended up editing config.h myself and added the define for tcp
wrappers in it. Then I built it and noticed that it would bomb out in 2
spots, all it needed was an edit in the Makefile to add "-lwrap" in the LIBS=
line. Then it built. When it was installed I noticed that my changes to
/etc/hosts.{allow,deny} were not effective. So I did a bit of googling and
read that Dovecot is chrooted. So it was just a matter of finding the chroot
and putting its own hosts.deny in there. It worked. So now only a select
number of hosts can use the pop3 service.
goldflipper% telnet solarscale.de 110
Trying 62.75.160.180...
Connected to solarscale.de.
Escape character is '^]'.
Connection closed by foreign host.
The patch is found here.
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Doing Docking@Home
June 29th, 2010
I was doing setiathome and einstein at home, but setiathome usually has no
work to give and einstein at home always produced calculation errors with
my boinc client. So now I've replaced einstein@home with
Docking@home.
Docking@Home is a project which uses Internet-connected computers to perform scientific calculations that aid in the creation of new and improved medicines. The project aims to help cure diseases such as Human Immunodeficiency Virus (HIV).
When there is
seti work one out of the two cpu threads work on it, and currently I have
two threads working away at it (two is equivalent to one core).
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The Summer Triangle
June 28th, 2010
Yesterday we were blessed with clear skies and I took the opportunity to take
photos of the summer triangle. Which consists of the stars Deneb, Vega (shown)
and Altair at the vertices. We were lucky to get them all into one shot.
There is a large version found here.
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The Arecibo Message
June 27th, 2010
Given the chart in the article below then, here is the approximate path
the Arecibo message is taking through our Galaxy. The Arecibo message
was an attempt at seeing if making contact with another world was possible.
Here is the wikipedia
article on it.
As you can see the message will travel through a pretty big chunk of our
Galaxy. It will probably have countless opportunities to be picked up. So
far the message is probably 36 light years away from our planet. Also the
message won't be travelling in a straight line either as einstein's theory
tells us that even light (or radio waves) will bend with influence of
gravity from stars. This graphic is just an approximation.
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The Milky Way Galaxy
June 26th, 2010
I came across this image on wikipedia...
I couldn't help but notice that the constellations were marked into it so
that you have somewhat of an idea where the earth is (in relation to the sun)
. If you've been reading this blog continuously you might have seen pictures
of Orion which was in the southern sky around midnight in winter.
Now it's summer and almost in the southern sky at 12 midnight is Sagittarius.
So then we're looking at the galactic center when it's summer, from our arm of
Orion-Cygnus. This is really cool IMO, so then we're going to look at
Cygnus constellation in Autumn and back to Orion in winter again. The
southern sky around the eliptic is a giant rotating window and it's fun
to see the constellations. (The program xephem helped me a lot as well).
I'm going to try to give these abbreviations names for you:
More abbreviations of constellations are here. I've added the names of the month when the constellation is best seen at mid night looking south.
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What does the future hold?
June 14th, 2010
I have 4 sourceforge projects. Natally, Wildcarddnsd, Cryologd and twh. What
is the future for them? Well I've given it a bit of thought on my summer
break and here is the rough outline of the coding that I want to do.
Natally does tunneling real well. And it's encrypted however what I'd
like to see from it is that it does address management as well so that clients
connecting to it can connect to each other through the tunnels. Also when
IPv6 comes along on my VPS I'd like to do a NAT feature for IPv6 because the
addresses given to my VPS are going to be finite and I want to make use of
them with the tunnels somewhat.
Wildcarddnsd is growing. The next big change planned for it is going
to be a recursive server that allows me to change all my nameserver settings
in resolv.conf be changed to my wildcarddnsd servers. The complexity is quite
high so this may drag on. In my planning I've included an ascii drawing in
the code for the code execution flow on how I think it should be done.
cryologd has been doing pretty well. Other than a condition where it
exited for no reason (I think I got that fixed) there is not too much that
needs to be done. One thing that the crypto code needs is an HMAC at the
end of each frame for authentication which gets rid of the password exchange
which may make this code a bit more robust and fluent. Changes going into
cryologd can also be ported to natally as that's where it originated.
twh has been considered for removal on sourceforge. I don't plan to
do development on it anymore but having the code resource on how to do the
Berkeley DB stuff for example may be a good thing to have. Wish I had the
time for it.
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