DelphinusDNS Blog
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January 31st, 2020
What tools did I use? What experience did I have to have?
When I started writing wildcarddnsd/delphinusdnsd I had 10 years of experience
with the UN*X Operating System. I had a lot of sysadmin experience and some
C programming experience. I started in 2005 (it was autumn) originally
the source code was checked in at sourceforge I believe. I personally felt
I was "ready" to lay down this code.
UNIX tools I used to write and debug delphinusdnsd
- vi - to enter the code from scratch (lots of fun!)
- tcpdump - to debug answers that delphinusdnsd gives
- hexdump - to debug dddctl's signing functions
- less/more - to paginate outputs and to look at zonefiles and code
- gdb - to debug crashes
- irssi - to share my enjoyment of writing on a DNS server on IRC and to get
support from people who have already done so.
- BSD - what I started using to write delphinusdnsd, up to this day
- Linux - what I ported delphinusdnsd to, up to this day
- make - to execute the makefiles which executed the compiler, assembler and
linker.
- dig - used mostly to query the server
- drill - used on FreeBSD instead of dig
- ldns-tools - helped a lot finding problems with the DNSSEC code
- Other DNS servers (BIND,nsd) - to compare their output from mine.
Literature used
Countless books about DNS, Unix network programming and YACC guided me
along the way, 10 years experience with UN*X OS's in 2005 started me on
this journey.
It's 2020 now, why did I decide to keep doing this?
I have put 15 years under my belt with this, I intend to do another 15
(god willing). It is a lot of fun steering my own project.
If I could turn back time would I do it again?
Yes.
0 comments
January 31st, 2020
1.3.0 was an oddball release because I applied to funding from the federal
german government in a program called Prototypefund.de, shifting the release
date early by half a year. I didn't get selected with delphinusdnsd.
Meaning, I paid out of my own pocket to work on version
1.4.0 and 1.4.1 (January 2019 through February 2020). In 2018 between
summer and christmas I had another project (OpenBSD powerpc64 port which
ultimately failed) while waiting on the selection results of prototypefund.
All releases before 1.3.0 were also constructed from my spare time as I could
find it. I'm glad 1.4.X is out and I'm looking forward to programming on
1.5.0 (expected to be released in late December). Someone I met is working
on an OpenBSD port for me and I'm looking forward to featuring him on the
Credits section of the delphinusdns.org site once the work is committed at
OpenBSD. The porting work is no easy feat and I'm glad someone is doing this
for me.
0 comments
January 26th, 2020
I believe the fixes I made to delphinusdnsd (on linux) were good. I'm going
to backport the code to the STABLE_1_4 branch soon and then tag it
RELEASE_1_4_1. I'm gonna run the code as it is now for another week on the
particular Linux computer that had problems throughout december and early
january and if I don't see any more crashes then it's a done deal. Sorry
for inconveniences. This I believe did not affect BSD versions of this
code, only Linux although and off-by-one was fixed (I think), that should
have impact on all platforms.
0 comments
January 9th, 2020
Sorry to bring these bad news...
I have noticed segfaults on Linux but not on OpenBSD, in the TCP engine
(tcploop()). I have for the time being reinstalled nsd on the linux replicant
and I'll have to see what's causing this. I know of one possible off-by-one
buffer overflow but I couldn't exploit it with my test program. I'm still
looking. I suspect that the problem may be with the linux TAILQ macros as I
remove a member from the tailq and it wasn't _SAFE (which is only found in
libbsd) so there is some room for corruption there. I'll look at replacing
the TAILQ macros with their libbsd equivalents for 1.5.0 and possibly backport
it to 1.4.1. Still deciding what to do and how to it correctly. I haven't
seen the OpenBSD delphinusdnsd with this behaviour, and that is what I care
most about.
2 comments
January 2nd, 2020
I have released delphinusdnsd 1.4.0. More info is found in the
news.html entry. I'd like to thank everyone that
contributed to this release (special thanks to FreeLogic and PiRATA).
0 comments
December 27th, 2019
Revision 1.98 of reply.c does more reply length checks and truncates when
appropriate. Before it gave weird answers because it excluded RRSIG's and
fit NSEC3's which was bogus. PowerDNS recursor noticed this as bogus and would
mark all zones on those nameserver as bogus (as tested). Of course PowerDNS
was right in this, and my code was wrong. Much thanks to Peng_ in #dns on
freenode who helped me debug this problem.
0 comments
December 26th, 2019
I found some problems with delphinusdnsd and I'd like a week of testing before
tagging it a release. I'm hoping for a release around or on January 2nd, 2020.
0 comments
December 22th, 2019
Sorry to bother you again, the last patch was wrong, I had edited the article
directly but you wouldn't see it if you didn't reload it. Here it is
again.
1 comment
December 22nd, 2019
Here is a patch,
if you're using the daemon. Unfortunately this won't be available until the
release day. I'm mindsearching if I'm going to put this release off until
next year (2020).
3 comments
December 20th, 2019
I'd like to wish you a happy december solstice and a merry christmas. I'm
going away for 6 days from my work setup until the 26th when I'll be back
in my apartment and doing the final check for delphinusdnsd and then
releasing it.
0 comments
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