Litecoinz-seeder is a crawler for the LitecoinZ network, which exposes a list of reliable nodes via a built-in DNS server.
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 24 threads simultaneously).
$ sudo apt-get install build-essential libboost-all-dev libssl-dev
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
;; ANSWER SECTION dnsseed.example.com. 86400 IN NS vps.example.com.
On the system vps.example.com, you can now run litecoinz-seeder:
./litecoinz-seeder -h dnsseed.example.com -n vps.example.com
If you want the DNS server to report SOA records, please provide an e-mail address (with the @ part replaced by .) using -m.
Compiling will require boost and ssl. On debian systems, these are provided
by libboost-dev and libssl-dev respectively.
$ make
This will produce the litecoinz-seeder binary.
Note: on Raspberry Pi 4 compile using:
$ make LDFLAGS="-latomic"
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 litecoinz-seeder in userspace, using the -p 5353 option.
Alternatively, you can use the CAP_NET_BIND_SERVICE capability on Linux kernel versions greater than 2.6.24.
$ setcap 'cap_net_bind_service=+ep' /path/to/litecoinz-seeder
setcap usually comes pre-installed on most modern distributions, but is
available in the libcap2-bin package on debian and libcap2 on RedHat.