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README
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absolute-seeder
==============
Absolute-seeder is a crawler for the Absolute 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 v0.12.2.3 to request new IP addresses from,
but only reports good post-v0.12.2.4 nodes (currently v0.12.2.5 only).
* 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).
REQUIREMENTS
------------
$ sudo apt-get install build-essential libboost-all-dev libssl-dev
USAGE
-----
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 dnsseed:
./dnsseed -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.
OPTIONS
-------
"-h <host> Hostname of the DNS seed\n"
"-n <ns> Hostname of the nameserver\n"
"-m <mbox> E-Mail address reported in SOA records\n"
"-s <seconds> Number of seconds to sleep before printing stats (default 1)\n"
"-t <threads> Number of crawlers to run in parallel (default 96)\n"
"-d <threads> Number of DNS server threads (default 4)\n"
"-p <port> UDP port to listen on (default 53)\n"
"-o <ip:port> Tor proxy IP/Port\n"
"-i <ip:port> IPV4 SOCKS5 proxy IP/Port\n"
"-k <ip:port> IPV6 SOCKS5 proxy IP/Port\n"
"-w f1,f2,... Allow these flag combinations as filters\n"
"--simplelog Do not use advanced stats output, use simple log-like one instead\n"
"--testnet Use testnet\n"
"--wipeban Wipe list of banned nodes\n"
"--wipeignore Wipe list of ignored nodes\n"
COMPILING
---------
Compiling will require boost and ssl. On debian systems, these are provided
by `libboost-dev` and `libssl-dev` respectively.
$ make
This will produce the `dnsseed` binary.
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.