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/*
* 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 "resolv_callback_unit_test"
#include <sys/stat.h>
#include <android-base/file.h>
#include <android-base/properties.h>
#include <gtest/gtest.h>
#include <netdutils/NetNativeTestBase.h>
#include <private/android_filesystem_config.h> // AID_DNS
#include "DnsResolver.h"
#include "getaddrinfo.h"
#include "resolv_cache.h"
#include "resolv_private.h"
#include "tests/resolv_test_utils.h"
namespace android::net {
using android::base::unique_fd;
using android::net::NetworkDnsEventReported;
using android::netdutils::ScopedAddrinfo;
// Use maximum reserved appId for applications to avoid conflict with existing uids.
const uid_t TEST_UID = 99999;
// Use testUid to make sure TagSocketCallback is called.
static uid_t testUid = 0;
// gApiLevel would be initialized in resolv_init().
#define SKIP_IF_APILEVEL_LESS_THAN(version) \
do { \
if (android::net::gApiLevel < (version)) { \
GTEST_LOG_(INFO) << "Skip. Required API version: " << (version) << "\n"; \
return; \
} \
} while (0)
void getNetworkContextCallback(uint32_t, uint32_t, android_net_context*) {
// No-op
}
bool checkCallingPermissionCallback(const char*) {
// No-op
return true;
}
void logCallback(const char*) {
// No-op
}
int tagSocketCallback(int, uint32_t, uid_t uid, pid_t) {
testUid = uid;
return true;
}
bool evaluateDomainNameCallback(const android_net_context&, const char*) {
// No-op
return true;
}
void initDnsResolverCallbacks() {
ResolverNetdCallbacks callbacks = {
.check_calling_permission = &checkCallingPermissionCallback,
.get_network_context = &getNetworkContextCallback,
.log = &logCallback,
.tagSocket = &tagSocketCallback,
.evaluate_domain_name = &evaluateDomainNameCallback,
};
// It returns fail since socket 'dnsproxyd' has been occupied.
// But the callback funtions is configured successfully and can
// be tested when running unit test cases.
resolv_init(&callbacks);
}
void resetDnsResolverCallbacks() {
ResolverNetdCallbacks callbacks = {
.check_calling_permission = nullptr,
.get_network_context = nullptr,
.log = nullptr,
.tagSocket = nullptr,
.evaluate_domain_name = nullptr,
};
resolv_init(&callbacks);
}
void resetCallbackParams() {
testUid = 0;
}
class CallbackTest : public NetNativeTestBase {
protected:
void SetUp() override {
initDnsResolverCallbacks();
// Create cache for test
android::net::gDnsResolv->resolverCtrl.createNetworkCache(TEST_NETID);
AllowNetworkInBackground(TEST_UID, true);
}
void TearDown() override {
// Reset related parameters and callback functions.
resetCallbackParams();
resetDnsResolverCallbacks();
// Delete cache for test
android::net::gDnsResolv->resolverCtrl.destroyNetworkCache(TEST_NETID);
AllowNetworkInBackground(TEST_UID, false);
}
int SetResolvers() {
const std::vector<std::string> servers = {test::kDefaultListenAddr};
const std::vector<std::string> domains = {"example.com"};
const res_params params = {
.sample_validity = 300,
.success_threshold = 25,
.min_samples = 8,
.max_samples = 8,
.base_timeout_msec = 1000,
.retry_count = 2,
};
return resolv_set_nameservers(TEST_NETID, servers, domains, params, std::nullopt);
}
const android_net_context mNetcontext = {
.app_netid = TEST_NETID,
.app_mark = MARK_UNSET,
.dns_netid = TEST_NETID,
.dns_mark = MARK_UNSET,
.uid = TEST_UID,
};
};
TEST_F(CallbackTest, tagSocketCallback) {
// tagSocketCallback is used when supported sdk version >=30.
SKIP_IF_APILEVEL_LESS_THAN(30);
test::DNSResponder dns;
dns.addMapping(kHelloExampleCom, ns_type::ns_t_a, kHelloExampleComAddrV4);
ASSERT_TRUE(dns.startServer());
EXPECT_EQ(SetResolvers(), 0);
addrinfo* result = nullptr;
const addrinfo hints = {.ai_family = AF_INET};
NetworkDnsEventReported event;
// tagSocketCallback will be called.
const int rv = resolv_getaddrinfo("hello", nullptr, &hints, &mNetcontext, &result, &event);
ScopedAddrinfo result_cleanup(result);
EXPECT_EQ(testUid, TEST_UID);
EXPECT_EQ(rv, 0);
}
TEST_F(CallbackTest, tagSocketFchown) {
const uint64_t tmpApiLevel = gApiLevel;
// Expect the given socket will be fchown() with given uid.
gApiLevel = 30; // R
unique_fd sk(socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0));
EXPECT_GE(sk, 3);
resolv_tag_socket(sk, TEST_UID, -1);
struct stat sb;
EXPECT_EQ(fstat(sk, &sb), 0);
EXPECT_EQ(sb.st_uid, TEST_UID);
// Expect the given socket will be fchown() with AID_DNS.
gApiLevel = 29; // Q
resolv_tag_socket(sk, TEST_UID, -1);
EXPECT_EQ(fstat(sk, &sb), 0);
EXPECT_EQ(sb.st_uid, static_cast<uid_t>(AID_DNS));
// restore API level.
gApiLevel = tmpApiLevel;
}
} // end of namespace android::net
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