72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#include "DnsQueryLog.h"
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#include "util.h"
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namespace android::net {
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namespace {
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std::string maskHostname(const std::string& hostname) {
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// Boundary issue is handled in substr().
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return hostname.substr(0, 1) + "***";
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}
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// Return the string of masked addresses of the first v4 address and the first v6 address.
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std::string maskIps(const std::vector<std::string>& ips) {
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std::string ret;
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bool v4Found = false, v6Found = false;
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for (const auto& ip : ips) {
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if (auto pos = ip.find_first_of(':'); pos != ip.npos && !v6Found) {
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ret += ip.substr(0, pos + 1) + "***, ";
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v6Found = true;
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} else if (auto pos = ip.find_first_of('.'); pos != ip.npos && !v4Found) {
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ret += ip.substr(0, pos + 1) + "***, ";
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v4Found = true;
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}
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if (v6Found && v4Found) break;
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}
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return ret.empty() ? "" : ret.substr(0, ret.length() - 2);
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}
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} // namespace
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void DnsQueryLog::push(Record&& record) {
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mQueue.push(std::move(record));
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}
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void DnsQueryLog::dump(netdutils::DumpWriter& dw) const {
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dw.println("DNS query log (last %lld minutes):", (mValidityTimeMs / 60000).count());
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netdutils::ScopedIndent indentStats(dw);
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const auto now = std::chrono::system_clock::now();
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for (const auto& record : mQueue.copy()) {
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if (now - record.timestamp > mValidityTimeMs) continue;
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const std::string maskedHostname = maskHostname(record.hostname);
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const std::string maskedIpsStr = maskIps(record.addrs);
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const std::string time = timestampToString(record.timestamp);
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dw.println("time=%s netId=%u uid=%u pid=%d hostname=%s answer=[%s] (%dms)", time.c_str(),
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record.netId, record.uid, record.pid, maskedHostname.c_str(),
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maskedIpsStr.c_str(), record.timeTaken);
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}
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}
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} // namespace android::net
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