67 lines
1.9 KiB
Plaintext
67 lines
1.9 KiB
Plaintext
bitcoin-seeder
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==============
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Bitcoin-seeder is a crawler for the Bitcoin network, which exposes a list
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of reliable nodes via a built-in DNS server.
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Features:
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* regularly revisits known nodes to check their availability
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* bans nodes after enough failures, or bad behaviour
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* accepts nodes down to v0.3.19 to request new IP addresses from,
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but only reports good post-v0.3.24 nodes.
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* keeps statistics over (exponential) windows of 2 hours, 8 hours,
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1 day and 1 week, to base decisions on.
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* very low memory (a few tens of megabytes) and cpu requirements.
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* crawlers run in parallel (by default 24 threads simultaneously).
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REQUIREMENTS
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------------
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$ sudo apt-get install build-essential libboost-all-dev libssl-dev
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USAGE
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-----
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Assuming you want to run a dns seed on dnsseed.example.com, you will
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need an authorative NS record in example.com's domain record, pointing
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to for example vps.example.com:
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$ dig -t NS dnsseed.example.com
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;; ANSWER SECTION
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dnsseed.example.com. 86400 IN NS vps.example.com.
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On the system vps.example.com, you can now run dnsseed:
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./dnsseed -h dnsseed.example.com -n vps.example.com
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If you want the DNS server to report SOA records, please provide an
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e-mail address (with the @ part replaced by .) using -m.
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COMPILING
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---------
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Compiling will require boost and ssl. On debian systems, these are provided
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by `libboost-dev` and `libssl-dev` respectively.
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$ make
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This will produce the `dnsseed` binary.
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RUNNING AS NON-ROOT
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-------------------
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Typically, you'll need root privileges to listen to port 53 (name service).
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One solution is using an iptables rule (Linux only) to redirect it to
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a non-privileged port:
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$ iptables -t nat -A PREROUTING -p udp --dport 53 -j REDIRECT --to-port 5353
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If properly configured, this will allow you to run dnsseed in userspace, using
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the -p 5353 option.
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Another solution is allowing a binary to bind to ports < 1024 with setcap (IPv6 access-safe)
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$ setcap 'cap_net_bind_service=+ep' /path/to/dnsseed
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