248 lines
9.7 KiB
C++
248 lines
9.7 KiB
C++
/*
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* Copyright (C) 2011 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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#define LOG_TAG "ResolverController"
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#define DBG 0
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#include <algorithm>
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#include <cstdlib>
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#include <string>
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#include <vector>
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#include <cutils/log.h>
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#include <net/if.h>
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#include <sys/socket.h>
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#include <netdb.h>
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// NOTE: <resolv_netid.h> is a private C library header that provides
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// declarations for _resolv_set_nameservers_for_net and
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// _resolv_flush_cache_for_net
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#include <resolv_netid.h>
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#include <resolv_params.h>
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#include <resolv_stats.h>
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#include <android-base/strings.h>
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#include <android/net/INetd.h>
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#include "DumpWriter.h"
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#include "ResolverController.h"
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#include "ResolverStats.h"
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int ResolverController::setDnsServers(unsigned netId, const char* searchDomains,
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const char** servers, int numservers, const __res_params* params) {
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if (DBG) {
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ALOGD("setDnsServers netId = %u\n", netId);
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}
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return -_resolv_set_nameservers_for_net(netId, servers, numservers, searchDomains, params);
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}
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int ResolverController::clearDnsServers(unsigned netId) {
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_resolv_set_nameservers_for_net(netId, NULL, 0, "", NULL);
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if (DBG) {
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ALOGD("clearDnsServers netId = %u\n", netId);
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}
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return 0;
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}
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int ResolverController::flushDnsCache(unsigned netId) {
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if (DBG) {
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ALOGD("flushDnsCache netId = %u\n", netId);
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}
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_resolv_flush_cache_for_net(netId);
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return 0;
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}
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int ResolverController::getDnsInfo(unsigned netId, std::vector<std::string>* servers,
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std::vector<std::string>* domains, __res_params* params,
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std::vector<android::net::ResolverStats>* stats) {
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using android::net::ResolverStats;
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using android::net::INetd;
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static_assert(ResolverStats::STATS_SUCCESSES == INetd::RESOLVER_STATS_SUCCESSES &&
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ResolverStats::STATS_ERRORS == INetd::RESOLVER_STATS_ERRORS &&
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ResolverStats::STATS_TIMEOUTS == INetd::RESOLVER_STATS_TIMEOUTS &&
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ResolverStats::STATS_INTERNAL_ERRORS == INetd::RESOLVER_STATS_INTERNAL_ERRORS &&
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ResolverStats::STATS_RTT_AVG == INetd::RESOLVER_STATS_RTT_AVG &&
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ResolverStats::STATS_LAST_SAMPLE_TIME == INetd::RESOLVER_STATS_LAST_SAMPLE_TIME &&
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ResolverStats::STATS_USABLE == INetd::RESOLVER_STATS_USABLE &&
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ResolverStats::STATS_COUNT == INetd::RESOLVER_STATS_COUNT,
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"AIDL and ResolverStats.h out of sync");
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int nscount = -1;
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sockaddr_storage res_servers[MAXNS];
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int dcount = -1;
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char res_domains[MAXDNSRCH][MAXDNSRCHPATH];
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__res_stats res_stats[MAXNS];
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servers->clear();
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domains->clear();
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*params = __res_params{};
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stats->clear();
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int revision_id = android_net_res_stats_get_info_for_net(netId, &nscount, res_servers, &dcount,
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res_domains, params, res_stats);
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// If the netId is unknown (which can happen for valid net IDs for which no DNS servers have
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// yet been configured), there is no revision ID. In this case there is no data to return.
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if (revision_id < 0) {
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return 0;
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}
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// Verify that the returned data is sane.
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if (nscount < 0 || nscount > MAXNS || dcount < 0 || dcount > MAXDNSRCH) {
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ALOGE("%s: nscount=%d, dcount=%d", __FUNCTION__, nscount, dcount);
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return -ENOTRECOVERABLE;
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}
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// Determine which servers are considered usable by the resolver.
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bool valid_servers[MAXNS];
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std::fill_n(valid_servers, MAXNS, false);
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android_net_res_stats_get_usable_servers(params, res_stats, nscount, valid_servers);
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// Convert the server sockaddr structures to std::string.
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stats->resize(nscount);
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for (int i = 0 ; i < nscount ; ++i) {
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char hbuf[NI_MAXHOST];
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int rv = getnameinfo(reinterpret_cast<const sockaddr*>(&res_servers[i]),
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sizeof(res_servers[i]), hbuf, sizeof(hbuf), nullptr, 0, NI_NUMERICHOST);
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std::string server_str;
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if (rv == 0) {
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server_str.assign(hbuf);
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} else {
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ALOGE("getnameinfo() failed for server #%d: %s", i, gai_strerror(rv));
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server_str.assign("<invalid>");
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}
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servers->push_back(std::move(server_str));
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android::net::ResolverStats& cur_stats = (*stats)[i];
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android_net_res_stats_aggregate(&res_stats[i], &cur_stats.successes, &cur_stats.errors,
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&cur_stats.timeouts, &cur_stats.internal_errors, &cur_stats.rtt_avg,
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&cur_stats.last_sample_time);
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cur_stats.usable = valid_servers[i];
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}
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// Convert the stack-allocated search domain strings to std::string.
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for (int i = 0 ; i < dcount ; ++i) {
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domains->push_back(res_domains[i]);
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}
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return 0;
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}
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int ResolverController::setResolverConfiguration(int32_t netId,
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const std::vector<std::string>& servers, const std::vector<std::string>& domains,
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const std::vector<int32_t>& params) {
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using android::net::INetd;
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if (params.size() != INetd::RESOLVER_PARAMS_COUNT) {
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ALOGE("%s: params.size()=%zu", __FUNCTION__, params.size());
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return -EINVAL;
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}
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auto server_count = std::min<size_t>(MAXNS, servers.size());
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std::vector<const char*> server_ptrs;
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for (size_t i = 0 ; i < server_count ; ++i) {
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server_ptrs.push_back(servers[i].c_str());
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}
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std::string domains_str;
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if (!domains.empty()) {
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domains_str = domains[0];
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for (size_t i = 1 ; i < domains.size() ; ++i) {
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domains_str += " " + domains[i];
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}
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}
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__res_params res_params;
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res_params.sample_validity = params[INetd::RESOLVER_PARAMS_SAMPLE_VALIDITY];
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res_params.success_threshold = params[INetd::RESOLVER_PARAMS_SUCCESS_THRESHOLD];
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res_params.min_samples = params[INetd::RESOLVER_PARAMS_MIN_SAMPLES];
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res_params.max_samples = params[INetd::RESOLVER_PARAMS_MAX_SAMPLES];
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return setDnsServers(netId, domains_str.c_str(), server_ptrs.data(), server_ptrs.size(),
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&res_params);
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}
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int ResolverController::getResolverInfo(int32_t netId, std::vector<std::string>* servers,
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std::vector<std::string>* domains, std::vector<int32_t>* params,
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std::vector<int32_t>* stats) {
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using android::net::ResolverStats;
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using android::net::INetd;
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__res_params res_params;
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std::vector<ResolverStats> res_stats;
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int ret = getDnsInfo(netId, servers, domains, &res_params, &res_stats);
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if (ret != 0) {
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return ret;
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}
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// Serialize the information for binder.
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ResolverStats::encodeAll(res_stats, stats);
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params->resize(INetd::RESOLVER_PARAMS_COUNT);
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(*params)[INetd::RESOLVER_PARAMS_SAMPLE_VALIDITY] = res_params.sample_validity;
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(*params)[INetd::RESOLVER_PARAMS_SUCCESS_THRESHOLD] = res_params.success_threshold;
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(*params)[INetd::RESOLVER_PARAMS_MIN_SAMPLES] = res_params.min_samples;
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(*params)[INetd::RESOLVER_PARAMS_MAX_SAMPLES] = res_params.max_samples;
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return 0;
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}
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void ResolverController::dump(DumpWriter& dw, unsigned netId) {
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// No lock needed since Bionic's resolver locks all accessed data structures internally.
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using android::net::ResolverStats;
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std::vector<std::string> servers;
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std::vector<std::string> domains;
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__res_params params;
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std::vector<ResolverStats> stats;
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time_t now = time(nullptr);
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int rv = getDnsInfo(netId, &servers, &domains, ¶ms, &stats);
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dw.incIndent();
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if (rv != 0) {
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dw.println("getDnsInfo() failed for netid %u", netId);
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} else {
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if (servers.empty()) {
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dw.println("No DNS servers defined");
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} else {
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dw.println("DNS servers: # IP (total, successes, errors, timeouts, internal errors, "
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"RTT avg, last sample)");
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dw.incIndent();
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for (size_t i = 0 ; i < servers.size() ; ++i) {
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if (i < stats.size()) {
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const ResolverStats& s = stats[i];
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int total = s.successes + s.errors + s.timeouts + s.internal_errors;
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if (total > 0) {
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int time_delta = (s.last_sample_time > 0) ? now - s.last_sample_time : -1;
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dw.println("%s (%d, %d, %d, %d, %d, %dms, %ds)%s", servers[i].c_str(),
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total, s.successes, s.errors, s.timeouts, s.internal_errors,
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s.rtt_avg, time_delta, s.usable ? "" : " BROKEN");
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} else {
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dw.println("%s <no data>", servers[i].c_str());
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}
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} else {
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dw.println("%s <no stats>", servers[i].c_str());
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}
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}
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dw.decIndent();
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}
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if (domains.empty()) {
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dw.println("No search domains defined");
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} else {
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std::string domains_str = android::base::Join(domains, ", ");
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dw.println("search domains: %s", domains_str.c_str());
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}
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if (params.sample_validity != 0) {
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dw.println("DNS parameters: sample validity = %us, success threshold = %u%%, "
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"samples (min, max) = (%u, %u)", params.sample_validity,
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static_cast<unsigned>(params.success_threshold),
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static_cast<unsigned>(params.min_samples),
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static_cast<unsigned>(params.max_samples));
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}
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}
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dw.decIndent();
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}
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