twister dns seeder
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ghost 81b74ef4ec add seed.twisterarmy.dedyn.io 10 months ago
Makefile Use more standard CXXFLAGS 12 years ago
README.md add some shine for README 10 years ago
bitcoin.cpp optimizations until we grow older and bigger: getaddr always and return all known ips per dns thread. 11 years ago
bitcoin.h Only poll nodes once a week for new addresses 12 years ago
combine.pl Better combination formula 13 years ago
compat.h Add missing files 13 years ago
db.cpp hack in support for dns querying non standard ports (nonstd. host alias) 9 years ago
db.h fix segmentation fault 4 years ago
dns.c hack in support for dns querying non standard ports (nonstd. host alias) 9 years ago
dns.h hack in support for dns querying non standard ports (nonstd. host alias) 9 years ago
main.cpp add seed.twisterarmy.dedyn.io 10 months ago
netbase.cpp Updated netbase from upstream bitcoin 12 years ago
netbase.h Updated netbase from upstream bitcoin 12 years ago
protocol.cpp now twister-seeder 11 years ago
protocol.h now twister-seeder 11 years ago
serialize.h working 13 years ago
strlcpy.h Add missing files 13 years ago
test.pl IPv6/AAAA record support 13 years ago
uint256.h working 13 years ago
util.cpp Add missing files 13 years ago
util.h fix logging 13 years ago

README.md

Twister-seeder

Twister-seeder is a crawler for the Twister (github) network, which exposes a list of reliable nodes via a built-in DNS server.

Code based on Bitcoin-seeder.

Features:

  • regularly revisits known nodes to check their availability
  • bans nodes after enough failures, or bad behaviour
  • accepts nodes down to v0.3.19 to request new IP addresses from, but only reports good post-v0.3.24 nodes.
  • keeps statistics over (exponential) windows of 2 hours, 8 hours, 1 day and 1 week, to base decisions on.
  • very low memory (a few tens of megabytes) and cpu requirements.
  • crawlers run in parallel (by default 96 threads simultaneously).

USAGE

Using of it is highly appreciated. If you have a 24×7 machine and you are able to add an special NS record to your domain, please consider running twister-seeder. Then let @miguelfreitas know and he will add your domain to the code base.

Assuming you want to run a dns seed on dnsseed.example.com, you will need an authorative NS record in example.com's domain record, pointing to for example vps.example.com:

dig -t NS dnsseed.example.com

As answer you should get something like this:

dnsseed.example.com. 86400 IN NS vps.example.com.

On the system vps.example.com, you can now run dnsseed:

./dnsseed -h dnsseed.example.com -n vps.example.com

If you want the DNS server to report SOA records, please provide an e-mailadres (with the @ part replaced by .) using -m.

RUNNING AS NON-ROOT

Typically, you'll need root privileges to listen to port 53 (name service).

One solution is using an iptables rule (Linux only) to redirect it to a non-privileged port:

iptables -t nat -A PREROUTING -p udp --dport 53 -j REDIRECT --to-port 5353

If properly configured, this will allow you to run dnsseed in userspace, using the -p 5353 option.