365 lines
16 KiB
C++
365 lines
16 KiB
C++
/*
|
|
* Copyright (C) 2019 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#define LOG_TAG "ResolverController"
|
|
|
|
#include "ResolverController.h"
|
|
|
|
#include <set>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
#include <aidl/android/net/IDnsResolver.h>
|
|
#include <android-base/logging.h>
|
|
#include <android-base/strings.h>
|
|
|
|
#include "Dns64Configuration.h"
|
|
#include "DnsResolver.h"
|
|
#include "DnsTlsDispatcher.h"
|
|
#include "PrivateDnsConfiguration.h"
|
|
#include "ResolverEventReporter.h"
|
|
#include "ResolverStats.h"
|
|
#include "resolv_cache.h"
|
|
#include "stats.h"
|
|
|
|
using aidl::android::net::ResolverParamsParcel;
|
|
using aidl::android::net::resolv::aidl::IDnsResolverUnsolicitedEventListener;
|
|
using aidl::android::net::resolv::aidl::Nat64PrefixEventParcel;
|
|
|
|
namespace android {
|
|
|
|
using netdutils::DumpWriter;
|
|
|
|
namespace net {
|
|
|
|
namespace {
|
|
|
|
void sendNat64PrefixEvent(const Dns64Configuration::Nat64PrefixInfo& args) {
|
|
LOG(DEBUG) << "Sending Nat64Prefix " << (args.added ? "added" : "removed") << " event on netId "
|
|
<< args.netId << " with prefix " << args.prefixString << "/"
|
|
<< (int)(args.prefixLength);
|
|
// Send a nat64 prefix event to NetdEventListenerService.
|
|
const auto& listeners = ResolverEventReporter::getInstance().getListeners();
|
|
if (listeners.empty()) {
|
|
LOG(ERROR) << __func__ << ": No available listener. Skipping NAT64 prefix event";
|
|
}
|
|
for (const auto& it : listeners) {
|
|
it->onNat64PrefixEvent(args.netId, args.added, args.prefixString, args.prefixLength);
|
|
}
|
|
|
|
const auto& unsolEventListeners = ResolverEventReporter::getInstance().getUnsolEventListeners();
|
|
const Nat64PrefixEventParcel nat64PrefixEvent = {
|
|
.netId = static_cast<int32_t>(args.netId),
|
|
.prefixOperation =
|
|
args.added ? IDnsResolverUnsolicitedEventListener::PREFIX_OPERATION_ADDED
|
|
: IDnsResolverUnsolicitedEventListener::PREFIX_OPERATION_REMOVED,
|
|
.prefixAddress = args.prefixString,
|
|
.prefixLength = args.prefixLength,
|
|
};
|
|
for (const auto& it : unsolEventListeners) {
|
|
it->onNat64PrefixEvent(nat64PrefixEvent);
|
|
}
|
|
}
|
|
|
|
int getDnsInfo(unsigned netId, std::vector<std::string>* servers, std::vector<std::string>* domains,
|
|
res_params* params, std::vector<android::net::ResolverStats>* stats,
|
|
std::vector<int32_t>* wait_for_pending_req_timeout_count) {
|
|
using aidl::android::net::IDnsResolver;
|
|
using android::net::ResolverStats;
|
|
static_assert(ResolverStats::STATS_SUCCESSES == IDnsResolver::RESOLVER_STATS_SUCCESSES &&
|
|
ResolverStats::STATS_ERRORS == IDnsResolver::RESOLVER_STATS_ERRORS &&
|
|
ResolverStats::STATS_TIMEOUTS == IDnsResolver::RESOLVER_STATS_TIMEOUTS &&
|
|
ResolverStats::STATS_INTERNAL_ERRORS ==
|
|
IDnsResolver::RESOLVER_STATS_INTERNAL_ERRORS &&
|
|
ResolverStats::STATS_RTT_AVG == IDnsResolver::RESOLVER_STATS_RTT_AVG &&
|
|
ResolverStats::STATS_LAST_SAMPLE_TIME ==
|
|
IDnsResolver::RESOLVER_STATS_LAST_SAMPLE_TIME &&
|
|
ResolverStats::STATS_USABLE == IDnsResolver::RESOLVER_STATS_USABLE &&
|
|
ResolverStats::STATS_COUNT == IDnsResolver::RESOLVER_STATS_COUNT,
|
|
"AIDL and ResolverStats.h out of sync");
|
|
int nscount = -1;
|
|
sockaddr_storage res_servers[MAXNS];
|
|
int dcount = -1;
|
|
char res_domains[MAXDNSRCH][MAXDNSRCHPATH];
|
|
res_stats res_stats[MAXNS];
|
|
servers->clear();
|
|
domains->clear();
|
|
*params = res_params{};
|
|
stats->clear();
|
|
int res_wait_for_pending_req_timeout_count;
|
|
int revision_id = android_net_res_stats_get_info_for_net(
|
|
netId, &nscount, res_servers, &dcount, res_domains, params, res_stats,
|
|
&res_wait_for_pending_req_timeout_count);
|
|
|
|
// If the netId is unknown (which can happen for valid net IDs for which no DNS servers have
|
|
// yet been configured), there is no revision ID. In this case there is no data to return.
|
|
if (revision_id < 0) {
|
|
return 0;
|
|
}
|
|
|
|
// Verify that the returned data is sane.
|
|
if (nscount < 0 || nscount > MAXNS || dcount < 0 || dcount > MAXDNSRCH) {
|
|
LOG(ERROR) << __func__ << ": nscount = " << nscount << ", dcount = " << dcount;
|
|
return -ENOTRECOVERABLE;
|
|
}
|
|
|
|
// Determine which servers are considered usable by the resolver.
|
|
bool valid_servers[MAXNS];
|
|
std::fill_n(valid_servers, MAXNS, false);
|
|
android_net_res_stats_get_usable_servers(params, res_stats, nscount, valid_servers);
|
|
|
|
// Convert the server sockaddr structures to std::string.
|
|
stats->resize(nscount);
|
|
for (int i = 0; i < nscount; ++i) {
|
|
char hbuf[NI_MAXHOST];
|
|
int rv =
|
|
getnameinfo(reinterpret_cast<const sockaddr*>(&res_servers[i]),
|
|
sizeof(res_servers[i]), hbuf, sizeof(hbuf), nullptr, 0, NI_NUMERICHOST);
|
|
std::string server_str;
|
|
if (rv == 0) {
|
|
server_str.assign(hbuf);
|
|
} else {
|
|
LOG(ERROR) << "getnameinfo() failed for server #" << i << ": " << gai_strerror(rv);
|
|
server_str.assign("<invalid>");
|
|
}
|
|
servers->push_back(std::move(server_str));
|
|
android::net::ResolverStats& cur_stats = (*stats)[i];
|
|
android_net_res_stats_aggregate(&res_stats[i], &cur_stats.successes, &cur_stats.errors,
|
|
&cur_stats.timeouts, &cur_stats.internal_errors,
|
|
&cur_stats.rtt_avg, &cur_stats.last_sample_time);
|
|
cur_stats.usable = valid_servers[i];
|
|
}
|
|
|
|
// Convert the stack-allocated search domain strings to std::string.
|
|
for (int i = 0; i < dcount; ++i) {
|
|
domains->push_back(res_domains[i]);
|
|
}
|
|
|
|
(*wait_for_pending_req_timeout_count)[0] = res_wait_for_pending_req_timeout_count;
|
|
return 0;
|
|
}
|
|
|
|
} // namespace
|
|
|
|
ResolverController::ResolverController()
|
|
: mDns64Configuration(
|
|
[](uint32_t netId, uint32_t uid, android_net_context* netcontext) {
|
|
gResNetdCallbacks.get_network_context(netId, uid, netcontext);
|
|
},
|
|
std::bind(sendNat64PrefixEvent, std::placeholders::_1)) {}
|
|
|
|
void ResolverController::destroyNetworkCache(unsigned netId) {
|
|
LOG(VERBOSE) << __func__ << ": netId = " << netId;
|
|
|
|
resolv_delete_cache_for_net(netId);
|
|
mDns64Configuration.stopPrefixDiscovery(netId);
|
|
PrivateDnsConfiguration::getInstance().clear(netId);
|
|
|
|
// Don't get this instance in PrivateDnsConfiguration. It's probe to deadlock.
|
|
DnsTlsDispatcher::getInstance().forceCleanup(netId);
|
|
}
|
|
|
|
int ResolverController::createNetworkCache(unsigned netId) {
|
|
LOG(VERBOSE) << __func__ << ": netId = " << netId;
|
|
|
|
return resolv_create_cache_for_net(netId);
|
|
}
|
|
|
|
int ResolverController::flushNetworkCache(unsigned netId) {
|
|
LOG(VERBOSE) << __func__ << ": netId = " << netId;
|
|
return resolv_flush_cache_for_net(netId);
|
|
}
|
|
|
|
int ResolverController::setResolverConfiguration(const ResolverParamsParcel& resolverParams) {
|
|
using aidl::android::net::IDnsResolver;
|
|
|
|
if (!has_named_cache(resolverParams.netId)) {
|
|
return -ENOENT;
|
|
}
|
|
|
|
// Expect to get the mark with system permission.
|
|
android_net_context netcontext;
|
|
gResNetdCallbacks.get_network_context(resolverParams.netId, 0 /* uid */, &netcontext);
|
|
|
|
// Allow at most MAXNS private DNS servers in a network to prevent too many broken servers.
|
|
std::vector<std::string> tlsServers = resolverParams.tlsServers;
|
|
if (tlsServers.size() > MAXNS) {
|
|
tlsServers.resize(MAXNS);
|
|
}
|
|
|
|
// Use app_mark for DoT connection. Using dns_mark might result in reaching the DoT servers
|
|
// through a different network. For example, on a VPN with no DNS servers (Do53), if the VPN
|
|
// applies to UID 0, dns_mark is assigned for default network rathan the VPN. (note that it's
|
|
// possible that a VPN doesn't have any DNS servers but DoT servers in DNS strict mode)
|
|
const int err = PrivateDnsConfiguration::getInstance().set(
|
|
resolverParams.netId, netcontext.app_mark, tlsServers, resolverParams.tlsName,
|
|
resolverParams.caCertificate);
|
|
|
|
if (err != 0) {
|
|
return err;
|
|
}
|
|
|
|
if (int err = resolv_stats_set_servers_for_dot(resolverParams.netId, tlsServers); err != 0) {
|
|
return err;
|
|
}
|
|
|
|
res_params res_params = {};
|
|
res_params.sample_validity = resolverParams.sampleValiditySeconds;
|
|
res_params.success_threshold = resolverParams.successThreshold;
|
|
res_params.min_samples = resolverParams.minSamples;
|
|
res_params.max_samples = resolverParams.maxSamples;
|
|
res_params.base_timeout_msec = resolverParams.baseTimeoutMsec;
|
|
res_params.retry_count = resolverParams.retryCount;
|
|
|
|
return resolv_set_nameservers(resolverParams.netId, resolverParams.servers,
|
|
resolverParams.domains, res_params,
|
|
resolverParams.resolverOptions, resolverParams.transportTypes);
|
|
}
|
|
|
|
int ResolverController::getResolverInfo(int32_t netId, std::vector<std::string>* servers,
|
|
std::vector<std::string>* domains,
|
|
std::vector<std::string>* tlsServers,
|
|
std::vector<int32_t>* params, std::vector<int32_t>* stats,
|
|
std::vector<int32_t>* wait_for_pending_req_timeout_count) {
|
|
using aidl::android::net::IDnsResolver;
|
|
using android::net::ResolverStats;
|
|
res_params res_params;
|
|
std::vector<ResolverStats> res_stats;
|
|
int ret = getDnsInfo(netId, servers, domains, &res_params, &res_stats,
|
|
wait_for_pending_req_timeout_count);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
|
|
// Serialize the information for binder.
|
|
ResolverStats::encodeAll(res_stats, stats);
|
|
|
|
const auto privateDnsStatus = PrivateDnsConfiguration::getInstance().getStatus(netId);
|
|
for (const auto& [server, _] : privateDnsStatus.serversMap) {
|
|
tlsServers->push_back(server.toIpString());
|
|
}
|
|
|
|
params->resize(IDnsResolver::RESOLVER_PARAMS_COUNT);
|
|
(*params)[IDnsResolver::RESOLVER_PARAMS_SAMPLE_VALIDITY] = res_params.sample_validity;
|
|
(*params)[IDnsResolver::RESOLVER_PARAMS_SUCCESS_THRESHOLD] = res_params.success_threshold;
|
|
(*params)[IDnsResolver::RESOLVER_PARAMS_MIN_SAMPLES] = res_params.min_samples;
|
|
(*params)[IDnsResolver::RESOLVER_PARAMS_MAX_SAMPLES] = res_params.max_samples;
|
|
(*params)[IDnsResolver::RESOLVER_PARAMS_BASE_TIMEOUT_MSEC] = res_params.base_timeout_msec;
|
|
(*params)[IDnsResolver::RESOLVER_PARAMS_RETRY_COUNT] = res_params.retry_count;
|
|
return 0;
|
|
}
|
|
|
|
void ResolverController::startPrefix64Discovery(int32_t netId) {
|
|
mDns64Configuration.startPrefixDiscovery(netId);
|
|
}
|
|
|
|
void ResolverController::stopPrefix64Discovery(int32_t netId) {
|
|
return mDns64Configuration.stopPrefixDiscovery(netId);
|
|
}
|
|
|
|
// TODO: use StatusOr<T> to wrap the result.
|
|
int ResolverController::getPrefix64(unsigned netId, netdutils::IPPrefix* prefix) {
|
|
netdutils::IPPrefix p = mDns64Configuration.getPrefix64(netId);
|
|
if (p.family() != AF_INET6 || p.length() == 0) {
|
|
LOG(INFO) << "No valid NAT64 prefix (" << netId << ", " << p.toString().c_str() << ")";
|
|
|
|
return -ENOENT;
|
|
}
|
|
*prefix = p;
|
|
return 0;
|
|
}
|
|
|
|
void ResolverController::dump(DumpWriter& dw, unsigned netId) {
|
|
// No lock needed since Bionic's resolver locks all accessed data structures internally.
|
|
using android::net::ResolverStats;
|
|
std::vector<std::string> servers;
|
|
std::vector<std::string> domains;
|
|
res_params params = {};
|
|
std::vector<ResolverStats> stats;
|
|
std::vector<int32_t> wait_for_pending_req_timeout_count(1, 0);
|
|
time_t now = time(nullptr);
|
|
int rv = getDnsInfo(netId, &servers, &domains, ¶ms, &stats,
|
|
&wait_for_pending_req_timeout_count);
|
|
dw.incIndent();
|
|
if (rv != 0) {
|
|
dw.println("getDnsInfo() failed for netid %u", netId);
|
|
} else {
|
|
if (servers.empty()) {
|
|
dw.println("No DNS servers defined");
|
|
} else {
|
|
dw.println("DnsEvent subsampling map: " +
|
|
android::base::Join(resolv_cache_dump_subsampling_map(netId), ' '));
|
|
dw.println(
|
|
"DNS servers: # IP (total, successes, errors, timeouts, internal errors, "
|
|
"RTT avg, last sample)");
|
|
dw.incIndent();
|
|
for (size_t i = 0; i < servers.size(); ++i) {
|
|
if (i < stats.size()) {
|
|
const ResolverStats& s = stats[i];
|
|
int total = s.successes + s.errors + s.timeouts + s.internal_errors;
|
|
if (total > 0) {
|
|
int time_delta = (s.last_sample_time > 0) ? now - s.last_sample_time : -1;
|
|
dw.println("%s (%d, %d, %d, %d, %d, %dms, %ds)%s", servers[i].c_str(),
|
|
total, s.successes, s.errors, s.timeouts, s.internal_errors,
|
|
s.rtt_avg, time_delta, s.usable ? "" : " BROKEN");
|
|
} else {
|
|
dw.println("%s <no data>", servers[i].c_str());
|
|
}
|
|
} else {
|
|
dw.println("%s <no stats>", servers[i].c_str());
|
|
}
|
|
}
|
|
dw.decIndent();
|
|
}
|
|
if (domains.empty()) {
|
|
dw.println("No search domains defined");
|
|
} else {
|
|
std::string domains_str = android::base::Join(domains, ", ");
|
|
dw.println("search domains: %s", domains_str.c_str());
|
|
}
|
|
if (params.sample_validity != 0) {
|
|
dw.println(
|
|
"DNS parameters: sample validity = %us, success threshold = %u%%, "
|
|
"samples (min, max) = (%u, %u), base_timeout = %dmsec, retry count = "
|
|
"%dtimes",
|
|
params.sample_validity, params.success_threshold, params.min_samples,
|
|
params.max_samples, params.base_timeout_msec, params.retry_count);
|
|
}
|
|
|
|
mDns64Configuration.dump(dw, netId);
|
|
const auto privateDnsStatus = PrivateDnsConfiguration::getInstance().getStatus(netId);
|
|
dw.println("Private DNS mode: %s", getPrivateDnsModeString(privateDnsStatus.mode));
|
|
if (privateDnsStatus.serversMap.size() == 0) {
|
|
dw.println("No Private DNS servers configured");
|
|
} else {
|
|
dw.println("Private DNS configuration (%u entries)",
|
|
static_cast<uint32_t>(privateDnsStatus.serversMap.size()));
|
|
dw.incIndent();
|
|
for (const auto& [server, validation] : privateDnsStatus.serversMap) {
|
|
dw.println("%s name{%s} status{%s}", server.toIpString().c_str(),
|
|
server.name.c_str(), validationStatusToString(validation));
|
|
}
|
|
dw.decIndent();
|
|
}
|
|
dw.println("Concurrent DNS query timeout: %d", wait_for_pending_req_timeout_count[0]);
|
|
resolv_netconfig_dump(dw, netId);
|
|
}
|
|
dw.decIndent();
|
|
}
|
|
|
|
} // namespace net
|
|
} // namespace android
|