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dns_client: retry when upstream result is empty.

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This commit is contained in:
Nick Peng
2023-12-19 22:29:44 +08:00
parent a19ac7eb07
commit 1d46fa6208
8 changed files with 209 additions and 9 deletions
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55
test/cases/test-dualstack.cc
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@@ -134,7 +134,7 @@ cache-persist no)""");
EXPECT_EQ(client.GetAnswer()[1].GetData(), "2001:db8::2");
}
TEST_F(DualStack, ipv6_prefer_must_exist_ipv4)
TEST_F(DualStack, ipv6_prefer_without_ipv4)
{
smartdns::MockServer server_upstream;
smartdns::Server server;
@@ -232,4 +232,55 @@ cache-persist no)""");
EXPECT_EQ(client.GetAuthority()[0].GetName(), "a.com");
EXPECT_GT(client.GetAuthority()[0].GetTTL(), 597);
EXPECT_EQ(client.GetAuthority()[0].GetType(), "SOA");
}
}
TEST_F(DualStack, ipv4_no_response)
{
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) {
smartdns::MockServer::AddIP(request, request->domain.c_str(), "1.2.3.4");
smartdns::MockServer::AddIP(request, request->domain.c_str(), "5.6.7.8");
return smartdns::SERVER_REQUEST_NO_RESPONSE;
} else if (request->qtype == DNS_T_AAAA) {
smartdns::MockServer::AddIP(request, request->domain.c_str(), "2001:db8::1");
smartdns::MockServer::AddIP(request, request->domain.c_str(), "2001:db8::2");
return smartdns::SERVER_REQUEST_OK;
}
return smartdns::SERVER_REQUEST_SOA;
});
server.MockPing(PING_TYPE_ICMP, "1.2.3.4", 60, 10000);
server.MockPing(PING_TYPE_ICMP, "5.6.7.8", 60, 10000);
server.MockPing(PING_TYPE_ICMP, "2001:db8::1", 60, 100);
server.MockPing(PING_TYPE_ICMP, "2001:db8::2", 60, 110);
server.Start(R"""(bind [::]:60053
server 127.0.0.1:61053
log-num 0
log-console yes
dualstack-ip-selection yes
speed-check-mode ping
log-level debug
cache-persist no)""");
smartdns::Client client;
ASSERT_TRUE(client.Query("a.com A", 60053));
std::cout << client.GetResult() << std::endl;
ASSERT_EQ(client.GetAnswerNum(), 0);
EXPECT_EQ(client.GetStatus(), "SERVFAIL");
usleep(220 * 1000);
ASSERT_TRUE(client.Query("a.com AAAA", 60053));
std::cout << client.GetResult() << std::endl;
ASSERT_EQ(client.GetAnswerNum(), 2);
EXPECT_EQ(client.GetStatus(), "NOERROR");
EXPECT_LT(client.GetQueryTime(), 20);
EXPECT_EQ(client.GetAnswer()[0].GetName(), "a.com");
EXPECT_GT(client.GetAnswer()[0].GetTTL(), 590);
EXPECT_EQ(client.GetAnswer()[0].GetData(), "2001:db8::1");
EXPECT_EQ(client.GetAnswer()[1].GetName(), "a.com");
EXPECT_GT(client.GetAnswer()[1].GetTTL(), 590);
EXPECT_EQ(client.GetAnswer()[1].GetData(), "2001:db8::2");
}