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202101_no_
9 changed files with 109 additions and 168 deletions
66
README
Normal file
66
README
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@ -0,0 +1,66 @@
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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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@ -80,7 +80,7 @@ class CNode {
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CAddress me(CService("0.0.0.0"));
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BeginMessage("version");
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int nBestHeight = GetRequireHeight();
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string ver = "/lbry-seeder:0.01/";
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string ver = "/bitcoin-seeder:0.01/";
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uint8_t fRelayTxs = 0;
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vSend << PROTOCOL_VERSION << nLocalServices << nTime << you << me << nLocalNonce << ver << nBestHeight << fRelayTxs;
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EndMessage();
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@ -314,3 +314,4 @@ int main(void) {
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printf("ret=%s ban=%i vAddr.size()=%i\n", ret ? "good" : "bad", ban, (int)vAddr.size());
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}
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*/
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@ -58,7 +58,7 @@ for my $file (@ARGV) {
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}
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for my $addr (sort { $res->{$b} <=> $res->{$a} } (keys %{$res})) {
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if ($addr =~ /\A(\d+)\.(\d+)\.(\d+)\.(\d+):9246/) {
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if ($addr =~ /\A(\d+)\.(\d+)\.(\d+)\.(\d+):8333/) {
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my $a = $1*0x1000000 + $2*0x10000 + $3*0x100 + $4;
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printf "0x%08x %s %g%%\n",$a,$addr,(1-((1-$res->{$addr}) ** (1/$n)))*100;
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}
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6
db.h
6
db.h
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@ -12,11 +12,11 @@
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#define MIN_RETRY 1000
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#define REQUIRE_VERSION 70015
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#define REQUIRE_VERSION 70001
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static inline int GetRequireHeight(const bool testnet = fTestNet)
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{
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return testnet ? 1000 : 940000;
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return testnet ? 500000 : 350000;
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}
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std::string static inline ToString(const CService &ip) {
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@ -119,7 +119,7 @@ public:
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}
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int GetBanTime() const {
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if (IsGood()) return 0;
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if (clientVersion && clientVersion < 31800) { return 604800; }
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if (clientVersion && clientVersion < 31900) { return 604800; }
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if (stat1M.reliability - stat1M.weight + 1.0 < 0.15 && stat1M.count > 32) { return 30*86400; }
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if (stat1W.reliability - stat1W.weight + 1.0 < 0.10 && stat1W.count > 16) { return 7*86400; }
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if (stat1D.reliability - stat1D.weight + 1.0 < 0.05 && stat1D.count > 8) { return 1*86400; }
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20
main.cpp
20
main.cpp
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@ -36,7 +36,7 @@ public:
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CDnsSeedOpts() : nThreads(96), nDnsThreads(4), ip_addr("::"), nPort(53), mbox(NULL), ns(NULL), host(NULL), tor(NULL), fUseTestNet(false), fWipeBan(false), fWipeIgnore(false), ipv4_proxy(NULL), ipv6_proxy(NULL) {}
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void ParseCommandLine(int argc, char **argv) {
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static const char *help = "LBRY-seeder\n"
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static const char *help = "Bitcoin-seeder\n"
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"Usage: %s -h <host> -n <ns> [-m <mbox>] [-t <threads>] [-p <port>]\n"
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"\n"
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"Options:\n"
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@ -78,7 +78,7 @@ public:
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{0, 0, 0, 0}
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};
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int option_index = 0;
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int c = getopt_long(argc, argv, "h:n:m:t:a:p:d:o:i:k:w:?", long_options, &option_index);
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int c = getopt_long(argc, argv, "h:n:m:t:a:p:d:o:i:k:w:", long_options, &option_index);
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if (c == -1) break;
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switch (c) {
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case 'h': {
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@ -418,9 +418,11 @@ extern "C" void* ThreadStats(void*) {
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return nullptr;
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}
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static const string mainnet_seeds[] = {"dnsseed1.lbry.io", "dnsseed2.lbry.io", "dnsseed3.lbry.io", ""};
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static const string testnet_seeds[] = {"testdnsseed1.lbry.io",
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"testdnsseed2.lbry.io",
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static const string mainnet_seeds[] = {"dnsseed.bluematt.me", "bitseed.xf2.org", "dnsseed.bitcoin.dashjr.org", "seed.bitcoin.sipa.be", ""};
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static const string testnet_seeds[] = {"testnet-seed.alexykot.me",
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"testnet-seed.bitcoin.petertodd.org",
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"testnet-seed.bluematt.me",
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"testnet-seed.bitcoin.schildbach.de",
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""};
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static const string *seeds = mainnet_seeds;
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@ -478,10 +480,10 @@ int main(int argc, char **argv) {
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bool fDNS = true;
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if (opts.fUseTestNet) {
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printf("Using testnet.\n");
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pchMessageStart[0] = 0xfa;
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pchMessageStart[1] = 0xe4;
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pchMessageStart[2] = 0xaa;
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pchMessageStart[3] = 0xe1;
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pchMessageStart[0] = 0x0b;
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pchMessageStart[1] = 0x11;
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pchMessageStart[2] = 0x09;
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pchMessageStart[3] = 0x07;
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seeds = testnet_seeds;
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fTestNet = true;
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}
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@ -22,7 +22,7 @@ static const char* ppszTypeName[] =
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"block",
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};
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unsigned char pchMessageStart[4] = { 0xfa, 0xe4, 0xaa, 0xf1 };
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unsigned char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };
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CMessageHeader::CMessageHeader()
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{
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@ -18,7 +18,7 @@
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extern bool fTestNet;
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static inline unsigned short GetDefaultPort(const bool testnet = fTestNet)
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{
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return testnet ? 19246 : 9246;
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return testnet ? 18333 : 8333;
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}
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//
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@ -44,7 +44,7 @@ class CMessageHeader
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READWRITE(FLATDATA(pchMessageStart));
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READWRITE(FLATDATA(pchCommand));
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READWRITE(nMessageSize);
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if (nVersion >= 1)
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if (nVersion >= 209)
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READWRITE(nChecksum);
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)
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128
readme.md
128
readme.md
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@ -1,128 +0,0 @@
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# seeder
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seeder is a crawler for the LBRY 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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## Build
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```
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sudo apt-get install build-essential libboost-dev libssl-dev
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make
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```
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## Use
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Assumptions:
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- lbrycrd will use the domain `seed.example.com` to find peer nodes
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- you will be running this seeder on a server at domain `vps.example.com`
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### Configure DNS
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You will need two DNS records:
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type | name | value
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-----|------------------| ---------------
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NS | seed.example.com | vps.example.com
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A | vps.example.com | 1.2.3.4
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Test your DNS records
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```
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$ dig -t NS seed.example.com
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;; ANSWER SECTION
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seed.example.com. 86400 IN NS vps.example.com.
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```
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### Disable systemd resolver (Ubuntu 18.04+)
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You only need this if you want to run the seeder on port 53 and it's taken by
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Ubuntu's resolved. Run the following to turn the resolver off and prevent
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it from starting on reboot
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```
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sudo systemctl stop systemd-resolved.service
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sudo systemctl disable systemd-resolved.service
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```
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### Open firewall port
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For example, if using UFW, run `ufw allow 53`. Some VPS providers also
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have their own firewall that you'll need to configure.
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### Run the seeder
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On the system vps.example.com, you can now run dnsseed:
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```
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./dnsseed -h seed.example.com -n vps.example.com
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```
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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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### Running as non-root
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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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```
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iptables -t nat -A PREROUTING -p udp --dport 53 -j REDIRECT --to-port 5353
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```
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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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```
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setcap 'cap_net_bind_service=+ep' /path/to/dnsseed
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```
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## Debugging
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### Server-side
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On the server, run `sudo tcpdump port 53`. This will show you all traffic on port 53. As
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you send DNS queries, you should see `A` requests come in and response IPs go out.
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- no incoming responses: DNS or firewall issues, or DNS request is cached client-side
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- no responses: seeder is not running, or running on the wrong port, or broken
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- empty responses: requested domain doesn't match configured domain in seeder
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You can also look at the output of the running seeder. It looks like this
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```
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[21-04-12 19:30:49] 28/104 available (104 tried in 994s, 1 new, 30 active), 0 banned; 38 DNS requests, 1 db queries
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```
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- if # of DNS requests is not going up as you send them, then seeder is not getting your requests
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- if DNS requests are increasing but db queries are not, then the -h domain doesn't match
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- if seeder didn't find any nodes, then it can't contact the nodes it itself is seeded with
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### Client-side
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Try `dig +short seed.example.com`. If you get node IPs, your setup is working.
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Other things to try
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- `dig @1.2.3.4 seed.example.com` to bypass local DNS cache or incorrect DNS records
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- `dig +trace seed.example.com` for detailed routing info
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@ -60,7 +60,7 @@ class CDataStream;
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class CAutoFile;
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static const unsigned int MAX_SIZE = 0x02000000;
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static const int PROTOCOL_VERSION = 70015;
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static const int PROTOCOL_VERSION = 60000;
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// Used to bypass the rule against non-const reference to temporary
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// where it makes sense with wrappers such as CFlatData or CTxDB
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Loading…
Reference in a new issue