Mike Yu | e655b1d | 2019-08-28 17:49:59 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | * |
| 16 | */ |
| 17 | |
| 18 | #define LOG_TAG "resolv" |
| 19 | |
| 20 | #include "DnsStats.h" |
| 21 | |
| 22 | #include <android-base/logging.h> |
| 23 | #include <android-base/stringprintf.h> |
| 24 | |
| 25 | namespace android::net { |
| 26 | |
| 27 | using base::StringPrintf; |
| 28 | using netdutils::DumpWriter; |
| 29 | using netdutils::IPAddress; |
| 30 | using netdutils::IPSockAddr; |
| 31 | using netdutils::ScopedIndent; |
| 32 | using std::chrono::duration_cast; |
| 33 | using std::chrono::microseconds; |
| 34 | using std::chrono::milliseconds; |
| 35 | using std::chrono::seconds; |
| 36 | |
| 37 | namespace { |
| 38 | |
| 39 | static constexpr IPAddress INVALID_IPADDRESS = IPAddress(); |
| 40 | |
| 41 | std::string rcodeToName(int rcode) { |
| 42 | // clang-format off |
| 43 | switch (rcode) { |
| 44 | case NS_R_NO_ERROR: return "NOERROR"; |
| 45 | case NS_R_FORMERR: return "FORMERR"; |
| 46 | case NS_R_SERVFAIL: return "SERVFAIL"; |
| 47 | case NS_R_NXDOMAIN: return "NXDOMAIN"; |
| 48 | case NS_R_NOTIMPL: return "NOTIMP"; |
| 49 | case NS_R_REFUSED: return "REFUSED"; |
| 50 | case NS_R_YXDOMAIN: return "YXDOMAIN"; |
| 51 | case NS_R_YXRRSET: return "YXRRSET"; |
| 52 | case NS_R_NXRRSET: return "NXRRSET"; |
| 53 | case NS_R_NOTAUTH: return "NOTAUTH"; |
| 54 | case NS_R_NOTZONE: return "NOTZONE"; |
| 55 | case NS_R_INTERNAL_ERROR: return "INTERNAL_ERROR"; |
| 56 | case NS_R_TIMEOUT: return "TIMEOUT"; |
| 57 | default: return StringPrintf("UNKNOWN(%d)", rcode); |
| 58 | } |
| 59 | // clang-format on |
| 60 | } |
| 61 | |
| 62 | bool ensureNoInvalidIp(const std::vector<IPSockAddr>& servers) { |
| 63 | for (const auto& server : servers) { |
| 64 | if (server.ip() == INVALID_IPADDRESS || server.port() == 0) { |
| 65 | LOG(WARNING) << "Invalid server: " << server; |
| 66 | return false; |
| 67 | } |
| 68 | } |
| 69 | return true; |
| 70 | } |
| 71 | |
| 72 | } // namespace |
| 73 | |
| 74 | // The comparison ignores the last update time. |
| 75 | bool StatsData::operator==(const StatsData& o) const { |
| 76 | return std::tie(serverSockAddr, total, rcodeCounts, latencyUs) == |
| 77 | std::tie(o.serverSockAddr, o.total, o.rcodeCounts, o.latencyUs); |
| 78 | } |
| 79 | |
| 80 | std::string StatsData::toString() const { |
| 81 | if (total == 0) return StringPrintf("%s <no data>", serverSockAddr.ip().toString().c_str()); |
| 82 | |
| 83 | const auto now = std::chrono::steady_clock::now(); |
| 84 | const int meanLatencyMs = duration_cast<milliseconds>(latencyUs).count() / total; |
| 85 | const int lastUpdateSec = duration_cast<seconds>(now - lastUpdate).count(); |
| 86 | std::string buf; |
| 87 | for (const auto& [rcode, counts] : rcodeCounts) { |
| 88 | if (counts != 0) { |
| 89 | buf += StringPrintf("%s:%d ", rcodeToName(rcode).c_str(), counts); |
| 90 | } |
| 91 | } |
| 92 | return StringPrintf("%s (%d, %dms, [%s], %ds)", serverSockAddr.ip().toString().c_str(), total, |
| 93 | meanLatencyMs, buf.c_str(), lastUpdateSec); |
| 94 | } |
| 95 | |
| 96 | StatsRecords::StatsRecords(const IPSockAddr& ipSockAddr, size_t size) |
| 97 | : mCapacity(size), mStatsData(ipSockAddr) {} |
| 98 | |
| 99 | void StatsRecords::push(const Record& record) { |
| 100 | updateStatsData(record, true); |
| 101 | mRecords.push_back(record); |
| 102 | |
| 103 | if (mRecords.size() > mCapacity) { |
| 104 | updateStatsData(mRecords.front(), false); |
| 105 | mRecords.pop_front(); |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | void StatsRecords::updateStatsData(const Record& record, const bool add) { |
| 110 | const int rcode = record.rcode; |
| 111 | if (add) { |
| 112 | mStatsData.total += 1; |
| 113 | mStatsData.rcodeCounts[rcode] += 1; |
| 114 | mStatsData.latencyUs += record.latencyUs; |
| 115 | } else { |
| 116 | mStatsData.total -= 1; |
| 117 | mStatsData.rcodeCounts[rcode] -= 1; |
| 118 | mStatsData.latencyUs -= record.latencyUs; |
| 119 | } |
| 120 | mStatsData.lastUpdate = std::chrono::steady_clock::now(); |
| 121 | } |
| 122 | |
| 123 | bool DnsStats::setServers(const std::vector<netdutils::IPSockAddr>& servers, Protocol protocol) { |
| 124 | if (!ensureNoInvalidIp(servers)) return false; |
| 125 | |
| 126 | ServerStatsMap& statsMap = mStats[protocol]; |
| 127 | for (const auto& server : servers) { |
| 128 | statsMap.try_emplace(server, StatsRecords(server, kLogSize)); |
| 129 | } |
| 130 | |
| 131 | // Clean up the map to eliminate the nodes not belonging to the given list of servers. |
| 132 | const auto cleanup = [&](ServerStatsMap* statsMap) { |
| 133 | ServerStatsMap tmp; |
| 134 | for (const auto& server : servers) { |
| 135 | if (statsMap->find(server) != statsMap->end()) { |
| 136 | tmp.insert(statsMap->extract(server)); |
| 137 | } |
| 138 | } |
| 139 | statsMap->swap(tmp); |
| 140 | }; |
| 141 | |
| 142 | cleanup(&statsMap); |
| 143 | |
| 144 | return true; |
| 145 | } |
| 146 | |
| 147 | bool DnsStats::addStats(const IPSockAddr& ipSockAddr, const DnsQueryEvent& record) { |
| 148 | if (ipSockAddr.ip() == INVALID_IPADDRESS) return false; |
| 149 | |
| 150 | for (auto& [serverSockAddr, statsRecords] : mStats[record.protocol()]) { |
| 151 | if (serverSockAddr == ipSockAddr) { |
| 152 | const StatsRecords::Record rec = { |
| 153 | .rcode = record.rcode(), |
| 154 | .latencyUs = microseconds(record.latency_micros()), |
| 155 | }; |
| 156 | statsRecords.push(rec); |
| 157 | return true; |
| 158 | } |
| 159 | } |
| 160 | return false; |
| 161 | } |
| 162 | |
| 163 | std::vector<StatsData> DnsStats::getStats(Protocol protocol) const { |
| 164 | std::vector<StatsData> ret; |
| 165 | |
| 166 | if (mStats.find(protocol) != mStats.end()) { |
| 167 | for (const auto& [_, statsRecords] : mStats.at(protocol)) { |
| 168 | ret.push_back(statsRecords.getStatsData()); |
| 169 | } |
| 170 | } |
| 171 | return ret; |
| 172 | } |
| 173 | |
| 174 | void DnsStats::dump(DumpWriter& dw) { |
| 175 | const auto dumpStatsMap = [&](ServerStatsMap& statsMap) { |
| 176 | ScopedIndent indentLog(dw); |
| 177 | if (statsMap.size() == 0) { |
| 178 | dw.println("<no server>"); |
| 179 | return; |
| 180 | } |
| 181 | for (const auto& [_, statsRecords] : statsMap) { |
| 182 | dw.println("%s", statsRecords.getStatsData().toString().c_str()); |
| 183 | } |
| 184 | }; |
| 185 | |
| 186 | dw.println("Server statistics: (total, RTT avg, {rcode:counts}, last update)"); |
| 187 | ScopedIndent indentStats(dw); |
| 188 | |
| 189 | dw.println("over UDP"); |
| 190 | dumpStatsMap(mStats[PROTO_UDP]); |
| 191 | |
| 192 | dw.println("over TLS"); |
| 193 | dumpStatsMap(mStats[PROTO_DOT]); |
| 194 | |
| 195 | dw.println("over TCP"); |
| 196 | dumpStatsMap(mStats[PROTO_TCP]); |
| 197 | } |
| 198 | |
| 199 | } // namespace android::net |