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net: switch to dummy internal ip for dns seed source

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This addresss the TODO to avoid resolving twice.
This commit is contained in:
Cory Fields 2017-05-23 20:48:08 -04:00
parent 6d0bd5b73d
commit 6cdc488e36
3 changed files with 19 additions and 25 deletions
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20
src/chainparams.cpp
View File

@ -124,12 +124,12 @@ public:
assert(genesis.hashMerkleRoot == uint256S("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));
// Note that of those with the service bits flag, most only support a subset of possible options
vSeeds.push_back(CDNSSeedData("bitcoin.sipa.be", "seed.bitcoin.sipa.be", true)); // Pieter Wuille, only supports x1, x5, x9, and xd
vSeeds.push_back(CDNSSeedData("bluematt.me", "dnsseed.bluematt.me", true)); // Matt Corallo, only supports x9
vSeeds.push_back(CDNSSeedData("dashjr.org", "dnsseed.bitcoin.dashjr.org")); // Luke Dashjr
vSeeds.push_back(CDNSSeedData("bitcoinstats.com", "seed.bitcoinstats.com", true)); // Christian Decker, supports x1 - xf
vSeeds.push_back(CDNSSeedData("bitcoin.jonasschnelli.ch", "seed.bitcoin.jonasschnelli.ch", true)); // Jonas Schnelli, only supports x1, x5, x9, and xd
vSeeds.push_back(CDNSSeedData("petertodd.org", "seed.btc.petertodd.org", true)); // Peter Todd, only supports x1, x5, x9, and xd
vSeeds.emplace_back("seed.bitcoin.sipa.be", true); // Pieter Wuille, only supports x1, x5, x9, and xd
vSeeds.emplace_back("dnsseed.bluematt.me", true); // Matt Corallo, only supports x9
vSeeds.emplace_back("dnsseed.bitcoin.dashjr.org"); // Luke Dashjr
vSeeds.emplace_back("seed.bitcoinstats.com", true); // Christian Decker, supports x1 - xf
vSeeds.emplace_back("seed.bitcoin.jonasschnelli.ch", true); // Jonas Schnelli, only supports x1, x5, x9, and xd
vSeeds.emplace_back("seed.btc.petertodd.org", true); // Peter Todd, only supports x1, x5, x9, and xd
base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,0);
base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,5);
@ -225,10 +225,10 @@ public:
vFixedSeeds.clear();
vSeeds.clear();
// nodes with support for servicebits filtering should be at the top
vSeeds.push_back(CDNSSeedData("testnetbitcoin.jonasschnelli.ch", "testnet-seed.bitcoin.jonasschnelli.ch", true));
vSeeds.push_back(CDNSSeedData("petertodd.org", "seed.tbtc.petertodd.org", true));
vSeeds.push_back(CDNSSeedData("bluematt.me", "testnet-seed.bluematt.me"));
vSeeds.push_back(CDNSSeedData("bitcoin.schildbach.de", "testnet-seed.bitcoin.schildbach.de"));
vSeeds.emplace_back("testnet-seed.bitcoin.jonasschnelli.ch", true);
vSeeds.emplace_back("seed.tbtc.petertodd.org", true);
vSeeds.emplace_back("testnet-seed.bluematt.me");
vSeeds.emplace_back("testnet-seed.bitcoin.schildbach.de");
base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,111);
base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,196);

4
src/chainparams.h
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@ -15,9 +15,9 @@
#include <vector>
struct CDNSSeedData {
std::string name, host;
std::string host;
bool supportsServiceBitsFiltering;
CDNSSeedData(const std::string &strName, const std::string &strHost, bool supportsServiceBitsFilteringIn = false) : name(strName), host(strHost), supportsServiceBitsFiltering(supportsServiceBitsFilteringIn) {}
CDNSSeedData(const std::string &strHost, bool supportsServiceBitsFilteringIn = false) : host(strHost), supportsServiceBitsFiltering(supportsServiceBitsFilteringIn) {}
};
struct SeedSpec6 {

20
src/net.cpp
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@ -1604,7 +1604,12 @@ void CConnman::ThreadDNSAddressSeed()
std::vector<CNetAddr> vIPs;
std::vector<CAddress> vAdd;
ServiceFlags requiredServiceBits = nRelevantServices;
if (LookupHost(GetDNSHost(seed, &requiredServiceBits).c_str(), vIPs, 0, true))
std::string host = GetDNSHost(seed, &requiredServiceBits);
CNetAddr resolveSource;
if (!resolveSource.SetInternal(host)) {
continue;
}
if (LookupHost(host.c_str(), vIPs, 0, true))
{
BOOST_FOREACH(const CNetAddr& ip, vIPs)
{
@ -1614,18 +1619,7 @@ void CConnman::ThreadDNSAddressSeed()
vAdd.push_back(addr);
found++;
}
}
if (interruptNet) {
return;
}
// TODO: The seed name resolve may fail, yielding an IP of [::], which results in
// addrman assigning the same source to results from different seeds.
// This should switch to a hard-coded stable dummy IP for each seed name, so that the
// resolve is not required at all.
if (!vIPs.empty()) {
CService seedSource;
Lookup(seed.name.c_str(), seedSource, 0, true);
addrman.Add(vAdd, seedSource);
addrman.Add(vAdd, resolveSource);
}
}
}