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/*************************************************************************
*
* Copyright (C) 2018-2024 Ruilin Peng (Nick) <pymumu@gmail.com>.
*
* smartdns is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* smartdns is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "client.h"
#include "dns.h"
#include "include/utils.h"
#include "server.h"
#include "gtest/gtest.h"
class Server : public ::testing::Test
{
protected:
virtual void SetUp() {}
virtual void TearDown() {}
};
TEST_F(Server, all_unreach)
{
smartdns::MockServer server_upstream;
smartdns::Server server;
server_upstream.Start("udp://0.0.0.0:61053", [](struct smartdns::ServerRequestContext *request) {
if (request->qtype != DNS_T_A) {
return smartdns::SERVER_REQUEST_SOA;
}
smartdns::MockServer::AddIP(request, request->domain.c_str(), "1.2.3.4", 611);
EXPECT_EQ(request->domain, "e.com");
return smartdns::SERVER_REQUEST_OK;
});
server.MockPing(PING_TYPE_ICMP, "2001::", 128, 10000);
server.Start(R"""(bind [::]:60053
bind-tcp [::]:60053
server tls://255.255.255.255
server https://255.255.255.255
server tcp://255.255.255.255
)""");
smartdns::Client client;
ASSERT_TRUE(client.Query("a.com", 60053));
std::cout << client.GetResult() << std::endl;
EXPECT_EQ(client.GetStatus(), "SERVFAIL");
EXPECT_EQ(client.GetAnswerNum(), 0);
/* server should not crash */
ASSERT_TRUE(client.Query("a.com +tcp", 60053));
std::cout << client.GetResult() << std::endl;
EXPECT_EQ(client.GetStatus(), "SERVFAIL");
EXPECT_EQ(client.GetAnswerNum(), 0);
}
TEST_F(Server, one_nxdomain)
{
smartdns::MockServer server_upstream;
smartdns::MockServer server_upstream1;
smartdns::Server server;
server_upstream.Start("udp://0.0.0.0:61053", [](struct smartdns::ServerRequestContext *request) {
if (request->qtype != DNS_T_A) {
return smartdns::SERVER_REQUEST_SOA;
}
usleep(50000);
smartdns::MockServer::AddIP(request, request->domain.c_str(), "1.2.3.4", 611);
return smartdns::SERVER_REQUEST_OK;
});
server_upstream1.Start("udp://0.0.0.0:62053",
[](struct smartdns::ServerRequestContext *request) { return smartdns::SERVER_REQUEST_SOA; });
server.MockPing(PING_TYPE_ICMP, "2001::", 128, 10000);
server.Start(R"""(bind [::]:60053
bind-tcp [::]:60053
server 127.0.0.1:61053
server 127.0.0.1:62053
)""");
smartdns::Client client;
ASSERT_TRUE(client.Query("a.com", 60053));
std::cout << client.GetResult() << std::endl;
ASSERT_EQ(client.GetAnswerNum(), 1);
EXPECT_EQ(client.GetStatus(), "NOERROR");
EXPECT_EQ(client.GetAnswer()[0].GetName(), "a.com");
EXPECT_EQ(client.GetAnswer()[0].GetData(), "1.2.3.4");
}
TEST_F(Server, retry_no_result_with_NOERROR)
{
smartdns::MockServer server_upstream;
smartdns::MockServer server_upstream1;
smartdns::Server server;
int count = 0;
server_upstream.Start("udp://0.0.0.0:61053", [&](struct smartdns::ServerRequestContext *request) {
if (request->qtype != DNS_T_A) {
return smartdns::SERVER_REQUEST_SOA;
}
if (count++ < 2) {
dns_add_domain(request->response_packet, request->domain.c_str(), request->qtype, request->qclass);
request->response_packet->head.tc = 1;
return smartdns::SERVER_REQUEST_OK;
}
smartdns::MockServer::AddIP(request, request->domain.c_str(), "1.2.3.4", 611);
return smartdns::SERVER_REQUEST_OK;
});
server.Start(R"""(bind [::]:60053
bind-tcp [::]:60053
server 127.0.0.1:61053
dualstack-ip-selection no
)""");
smartdns::Client client;
ASSERT_TRUE(client.Query("a.com", 60053));
std::cout << client.GetResult() << std::endl;
ASSERT_EQ(client.GetAnswerNum(), 1);
EXPECT_EQ(client.GetStatus(), "NOERROR");
EXPECT_EQ(client.GetAnswer()[0].GetName(), "a.com");
EXPECT_EQ(client.GetAnswer()[0].GetData(), "1.2.3.4");
}
TEST_F(Server, retry_no_response)
{
smartdns::MockServer server_upstream;
smartdns::MockServer server_upstream1;
smartdns::Server server;
int count = 0;
server_upstream.Start("udp://0.0.0.0:61053", [&](struct smartdns::ServerRequestContext *request) {
count++;
return smartdns::SERVER_REQUEST_NO_RESPONSE;
});
server.Start(R"""(bind [::]:60053
bind-tcp [::]:60053
server 127.0.0.1:61053
)""");
smartdns::Client client;
ASSERT_TRUE(client.Query("a.com", 60053));
std::cout << client.GetResult() << std::endl;
ASSERT_EQ(client.GetAnswerNum(), 0);
EXPECT_EQ(client.GetStatus(), "SERVFAIL");
EXPECT_GE(client.GetQueryTime(), 1500);
EXPECT_GE(count, 4);
}
TEST_F(Server, max_queries)
{
smartdns::MockServer server_upstream;
smartdns::MockServer server_upstream1;
smartdns::Server server;
int count = 0;
server_upstream.Start("udp://0.0.0.0:61053", [&](struct smartdns::ServerRequestContext *request) {
smartdns::MockServer::AddIP(request, request->domain.c_str(), "1.2.3.4", 611);
sleep(1);
return smartdns::SERVER_REQUEST_OK;
});
server.MockPing(PING_TYPE_ICMP, "1.2.3.4", 128, 10);
server.Start(R"""(bind [::]:60053
bind-tcp [::]:60053
server 127.0.0.1:61053
dualstack-ip-selection no
max-query-limit 2
)""");
std::vector<std::thread> threads;
int success_num = 0;
int refused_num = 0;
for (int i = 0; i < 5; i++) {
auto t = std::thread([&]() {
smartdns::Client client;
ASSERT_TRUE(client.Query("a.com", 60053));
if (client.GetStatus() == "NOERROR") {
success_num++;
EXPECT_EQ(client.GetStatus(), "NOERROR");
ASSERT_EQ(client.GetAnswerNum(), 1);
EXPECT_EQ(client.GetAnswer()[0].GetName(), "a.com");
EXPECT_EQ(client.GetAnswer()[0].GetData(), "1.2.3.4");
} else if (client.GetStatus() == "REFUSED") {
refused_num++;
} else {
FAIL();
}
});
threads.push_back(std::move(t));
}
for (auto &t : threads) {
t.join();
}
EXPECT_EQ(success_num, 2);
EXPECT_EQ(refused_num, 3);
for (int i = 0; i < 5; i++) {
smartdns::Client client;
ASSERT_TRUE(client.Query("a.com", 60053));
EXPECT_EQ(client.GetStatus(), "NOERROR");
ASSERT_EQ(client.GetAnswerNum(), 1);
EXPECT_EQ(client.GetAnswer()[0].GetName(), "a.com");
EXPECT_EQ(client.GetAnswer()[0].GetData(), "1.2.3.4");
}
}
TEST_F(Server, interface)
{
smartdns::MockServer server_upstream;
smartdns::Server server;
server_upstream.Start("udp://0.0.0.0:61053", [](struct smartdns::ServerRequestContext *request) {
if (request->qtype != DNS_T_A) {
return smartdns::SERVER_REQUEST_SOA;
}
smartdns::MockServer::AddIP(request, request->domain.c_str(), "1.2.3.4", 611);
return smartdns::SERVER_REQUEST_OK;
});
server.MockPing(PING_TYPE_ICMP, "2001::", 128, 10000);
server.Start(R"""(bind [::]:60053
bind-tcp [::]:60053
server 127.0.0.1:61053 -interface lo
)""");
smartdns::Client client;
ASSERT_TRUE(client.Query("a.com", 60053));
std::cout << client.GetResult() << std::endl;
ASSERT_EQ(client.GetAnswerNum(), 1);
EXPECT_EQ(client.GetStatus(), "NOERROR");
EXPECT_EQ(client.GetAnswer()[0].GetName(), "a.com");
EXPECT_EQ(client.GetAnswer()[0].GetData(), "1.2.3.4");
}
TEST_F(Server, refused)
{
smartdns::MockServer server_upstream;
smartdns::MockServer server_upstream1;
smartdns::Server server;
int count = 0;
server_upstream.Start("udp://0.0.0.0:61053", [&](struct smartdns::ServerRequestContext *request) {
request->response_packet->head.rcode = DNS_RC_REFUSED;
dns_add_domain(request->response_packet, request->domain.c_str(), request->qtype, request->qclass);
return smartdns::SERVER_REQUEST_OK;
});
server.Start(R"""(bind [::]:60053
bind-tcp [::]:60053
server 127.0.0.1:61053
dualstack-ip-selection no
)""");
smartdns::Client client;
ASSERT_TRUE(client.Query("a.com", 60053));
std::cout << client.GetResult() << std::endl;
ASSERT_EQ(client.GetAnswerNum(), 0);
EXPECT_EQ(client.GetStatus(), "REFUSED");
EXPECT_LT(client.GetQueryTime(), 100);
}
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