Tweets of October 31 2011

So for my next RFC (if ever!) I decided I wanted to use Pandoc. As xml2rfc uses XML I thought the easiest way would be to create docbook XML and transform that using XSLT.

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color me, color you

2011-09-18 :: miek

#zsh @linux

In the xoria256m post, I introduced my xoria256 like color scheme. Again, inspired by solarized, I extended this to other applications. So now I use this in the following apps:

vim (see that previous post);
mutt (idem);
zsh;
dircolors;
git (a bit).

zsh

See this file to setup the colors. Then in my prompt I have stuff like:

PS1=$'${vcs_info_msg_0_}$FG[067]%(1j.$myjobs% $FX[reset].$FX[reset])$FG[179]%#$FX[reset] '
RPS1="$RPSL%$MAXMID<...<$mypath$RPSR$FG[239]$FX[bold]$__ZH$FX[reset]${vcs_info_msg_1_}"
RPSR=$'$FX[reset]$FG[009]%(0?.$FG[reset]. $E)$FX[reset]'

For zsh I have two files that make up my prompt:

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Xoria256m color scheme

2011-09-11 :: miek

# @linux

I recently came across solarized. I started to use it immediately for vim and mutt, but after a few days the low contrast of the color scheme started to annoy me. Oh and btw, I’m red/green color blind.

I went searching and found “xoria256” a color scheme suited for 256 color terminal and a dark background. There is even a Ubuntu/Debian package for it: vim-scripts. Unlike solarized it doesn’t come with a custom palette, just use Tango in gnome-terminal (or whatever your favorite is).

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Tweets of August 31 2011

2011-08-31 :: miek

#twitter @twitter

Cacert kan de deuren ook wel sluiten. SSL certs zijn dood. Lang leve #dane

Wed Aug 31 07:05:29 +0000 2011

Wat!? Is DigiNotar gekraakt door het DataCrime virus? #1989 #datwarennogeenstijden

Wed Aug 31 07:08:52 +0000 2011

Replying to @hj8rs

even the ietf cannot handle ssl it seems. #fail #ssl #ietf

Wed Aug 31 07:18:40 +0000 2011

RT @DEVOPS_BORAT: If forget root password, not need of boot in single user mode. Is sufficient of install Joomla and get root access imm ...

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Learning Go for E-readers

2011-08-28 :: miek

#golang @programming

Thanks to a patch from Thomas Kappler I can now offer two types of PDFs, one for A4 pages and one for E-readers, like the kindle.

The E-reader variant is suffixed with -kindle:

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Opposite of J

2011-08-13 :: miek

# @linux

In VIM you can use the command J to join to lines:

hello       -> J ->  hello goodday
goodday

Where the cursor is positioned somewhere on the ‘hello’ line.

But I often find myself wanting to use the opposite, I want ‘hello’ to be put after ‘goodday’. The cursor is now positioned on the ‘goodday’ line.

hello
goodday    -> K -> goodday hello

The following mapping does that:

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VIM setup

2011-08-12 :: miek

#golang @programming

After several years I decided to use a different color scheme for VIM. Also I’m going for force myself to use VIM’s folding abilities and use make from within VIM.

For good measure I also want to use Omni-completion when writing Go code:

Btw, this screenshots also shows the solarized (dark) colorscheme.

Coloring

Google for solarized. In my .vimrc:

let g:solarized_termcolors=256
colorscheme solarized

Make from VIM

Use :make inside the editor and jump through the errors with:

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Project page for Learning Go

2011-08-11 :: miek

# @docs

I added a shiny project page for the “Learning Go” book I’m writing.

Errata, new releases and other stuff will get a place there.

For good measure I even added a “Donate” button - we’ll see how to that plays out.

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Chaining proxies

2011-08-01 :: miek

#golang @programming

Online signing is cool, but slow. Caching queries in a reverse proxy is nice, but useless for something like NSD. But what if you want to do online signing in a fast way?

Enter: proxy chaining.

I already showed FunkenSign (example code is quite old though) and yesterday FunkenShield.

What if you combine the two? That gives the best of both worlds:

Online signing;
Caching;
And it adheres to the true Unix philosophy: do one thing, and do one thing well.

So lets get some figures again.

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Reverse DNS proxy

2011-07-31 :: miek

#golang @programming

Have a slow nameserver and want to spice things up? How about a reverse DNS proxy? For lack of a cool name I chose the name FunkenShield. It’s (of course) in the early stages, but it works quite nicely already.

This is done with the framework of FunkenSturm. Which is part of GoDNS.

How it works:

You place FunkenShield in front of your nameserver and it will cache the binary packets coming from your server in a local cache.

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Tweets of July 31 2011

2011-07-31 :: miek

#twitter @twitter

From 3000 to 27000+ qps http://www.miek.nl/blog/archives/2011/07/31/reverse_dns_proxy/index.html #Golang #DNS #ReverseProxy

Sun Jul 31 14:21:41 +0000 2011

Replying to @bketelsen

not sure what you mean...godns implements dns. So everything you can do with the dns you can access via godns $if implemented$

Sun Jul 31 14:56:40 +0000 2011

Replying to @bketelsen

that’s easy. But how do you take into account client caching? You can also use bind and dynamic updates.

Sun Jul 31 15:07:32 +0000 2011

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OpenSSH and Kerberos

2011-07-25 :: miek

# @linux

[Personal note to self:]

I’m assuming LDAP en Kerberos completely setup and configured and working. You get your TGT after a kinit, etc. And then you want to utilize Kerberos to password-less login using ssh.

I have a client machine foton.atoom.net, from this machine you want to login to the server. The server is elektron.atoom.net.

On the client the command, hostname -f should return the fqdn of your host, in my case:

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On programming languages and programmers

2011-07-18 :: miek

#golang @programming

Very well written email message from Geoff Teale on the golang mailing list on programmers and progamming languages (thread).

To summarise a long presentation I gave to non-programmers:

There are 12 million programmers in the world

The majority of those programmers are scarcely qualified

Most technology decisions are made by a combination of following the crowd and a false understanding of risk.

The high cost and failure rate in software development is no coincidence.

Remember the Stevie Wonder rule - “When you believe in something you don’t understand then you suffer”. In this case that means “Perhaps making programming language decisions based on what 12 million powerless idiots are doing isn’t the golden road to glory and great hacks.”

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Go DNS (update)

2011-07-06 :: miek

#golang @programming

I’m finally back to coding Go DNS and making it work with the latest Go releases. Also the API has changed quite significantly since the last time I blogged about it.

So this I will detail key2ds which is small utility that queries a zone and print any DNSKEY records as DS records on the fly, to show the new API and some sample usage.

% ./key2ds sidn.nl
sidn.nl.    0   IN  DS  42033 8 1 343F74674D36C9B5BE2CEB2C401AC4EDEB2A05B2
sidn.nl.    0   IN  DS  42033 8 2 BF985EC0738FACC89EE0B12FBD9261827C59191D9EA6A9BDFF55F9BDF3DBBFF3
sidn.nl.    0   IN  DS  39274 8 1 E79E031DFDE8E68EF1E2C6CA0943C2CC0DED1889
sidn.nl.    0   IN  DS  39274 8 2 8E8A8CFB40FD0C30BFA82E53752E1C257DAFB7B6206D12B9EDA43AF3EAB2157D

This util uses synchronous queries. I will explain the main-function:

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Tweets of June 30 2011

2011-06-30 :: miek

#twitter @twitter

RT @danielaukes: Mag ik zeggen dat ik dat gentechvrijegemeente geneuzel in nijmegen grote onzin vind?

Thu Jun 30 07:15:33 +0000 2011

For those wanting/asking: I can not send out google+ invites

Thu Jun 30 08:05:45 +0000 2011

Learning Go $http://miek\.nl/files/go/$ is book of the week at root.cz: http://www.root.cz/knihy/learning-go/ #nice :-)

Thu Jun 30 08:17:58 +0000 2011

Replying to @Emiel2punt0

Dank je

Thu Jun 30 08:23:36 +0000 2011

Replying to @hj8rs

ah, ff proberen

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Tweets of May 31 2011

2011-05-31 :: miek

#twitter @twitter

@PowerDNS_Bert Thank you for: http://powerdnssec.org/downloads/packages/ !

Tue May 31 07:09:39 +0000 2011

Useless renaming of variables: CUR="${PWD}" #actual #code #bash

Tue May 31 10:35:17 +0000 2011

svn should support the -a flag $as a noop$

Tue May 31 12:23:04 +0000 2011

Whenever I see a screenshot of Ubuntu 10.10 I can’t help to think: Remember those go’old days?

Tue May 31 12:51:11 +0000 2011

Replying to @sspans

Dat moet helemaal een mooie tijd zijn geweest!

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Axfr to Git

2011-05-15 :: miek

# @dns

The problem: you want to keep a historical reference of zone changes. This little script helps you do that, it:

AXFRs the zone you want;
Cleans the zone a bit, sorts it and feeds it through named-compilezone to make it look “nice”;
Puts it in a git repository;
Checks it in with a date tag (date -u '+%Y-%m-%d_%H%M%S').

You do need to define the directory where the git repository is located in the script ($gitdir).

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Tweets of April 30 2011

2011-04-30 :: miek

#twitter @twitter

Lovely time in Rome. Tomorrow back to NL

Sat Apr 30 10:38:46 +0000 2011

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GNOME 3.2 Wishlist

2011-04-17 :: miek

# @linux

Zeitgeist integration;
Focus follows mouse working. As in ‘alt-tab’ obeys this too. See bug 597190;
Easier workspace switching;
Themes;
Much smaller window titlebars;
An easier way to find your windows, maybe a windowlist in the panel.

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Stay out of my windows

2011-04-09 :: miek

# @linux

It’s called a resize grip, you can’t disable it (seems to be a common theme nowadays…) and it sucks.

Stay the FUCK out of my windows with this crap!

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DNS reflector server in GO

2011-04-04 :: miek

#golang @programming

I’m (again) rewriting the API of godns. I’ve now taking a cue from the http package in Go, the result seems very nice. A reflector (returns your query in the answer) in Go becomes:

package main

import (
        "dns"
        "log"
)

func ReflectServer(w dns.ResponseWriter, req *dns.Msg) {
        m := new(dns.Msg)
        m.SetReply(req)

        m.Extra = make([]dns.RR, 1)
        m.Extra[0] = &dns.RR_TXT{Hdr: dns.RR_Header{Name: m.Question[0].Name, Rrtype: dns.TypeTXT, 
                Class: dns.ClassINET, Ttl: 0}, Txt: "Hello world"}
        buf, _ := m.Pack()
        w.Write(buf)
}

func main() {
        dns.HandleFunc(".", ReflectServer)
        err := dns.ListenAndServe(":8053", "udp", nil)
        if err != nil {
                log.Fatal("ListenAndServe: ", err.String())
        }
}

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