Function ThreadDNSAddressSeed

src/net.cpp:888–926

#endif

void ThreadDNSAddressSeed() {
    // goal: only query DNS seeds if address need is acute
    if ((addrman.size() > 0) && (!SysCfg().GetBoolArg("-forcednsseed", false))) {
        MilliSleep(11 * 1000);

        LOCK(cs_vNodes);
        if (vNodes.size() >= 2) {
            LogPrint(BCLog::INFO, "P2P peers available. Skipped DNS seeding.\n");
            return;
        }
    }

    const vector<CDNSSeedData>& vSeeds = SysCfg().DNSSeeds();
    int32_t found                          = 0;

    LogPrint(BCLog::INFO, "Loading addresses from DNS seeds (could take a while)\n");

    for (const auto& seed : vSeeds) {
        if (HaveNameProxy()) {
            AddOneShot(seed.host);
        } else {
            vector<CNetAddr> vIPs;
            vector<CAddress> vAdd;
            if (LookupHost(seed.host.c_str(), vIPs)) {
                for (auto& ip : vIPs) {
                    int32_t nOneDay   = 24 * 3600;
                    CAddress addr = CAddress(CService(ip, SysCfg().GetDefaultPort()));
                    addr.nTime =
                        GetTime() - 3 * nOneDay - GetRand(4 * nOneDay);  // use a random age between 3 and 7 days old
                    vAdd.push_back(addr);
                    found++;
                }
            }
            addrman.Add(vAdd, CNetAddr(seed.name, true));
        }
    }

    LogPrint(BCLog::INFO, "%d addresses found from DNS seeds\n", found);
}

void DumpAddresses() {
    int64_t nStart = GetTimeMillis();