/// <summary>
/// Stops the service immediately, terminating any user activity.
/// </summary>
public void Stop()
{
lock (syncLock)
{
if (state == ServiceState.Stopped)
{
return;
}
SysLog.LogInformation("Dynamic DNS Service Stop");
SysLog.Flush();
base.Close();
state = ServiceState.Stopped;
}
if (handler != null)
{
handler.Stop();
handler = null;
}
if (router != null)
{
router.Stop();
router = null;
}
Program.PerfCounters.Zero();
}
public void DynDnsHandler_Udp_ADDRESSLIST()
{
// Start a Dynamic DNS service handler and a client, register two ADDRESSLIST
// records for TEST1.COM and confirm that A queries return both entries.
// I'm also going to add an ADDRESS record for TEST2.COM and verify that this address
// is never returned.
DynDnsClientSettings clientSettings;
DynDnsHandler handler = null;
DynDnsClient client = null;
DnsResponse response;
try
{
handler = new DynDnsHandler();
handler.Start(router, null, null, null);
clientSettings = new DynDnsClientSettings()
{
Mode = DynDnsMode.Udp,
NameServers = new NetworkBinding[] { new NetworkBinding("127.0.0.1:DYNAMIC-DNS") },
UdpRegisterInterval = TimeSpan.FromSeconds(1)
};
client = new DynDnsClient();
client.Register(new DynDnsHostEntry("test1.com,10.0.0.1,1000,ADDRESSLIST"));
client.Register(new DynDnsHostEntry("test1.com,10.0.0.2,1000,ADDRESSLIST"));
client.Register(new DynDnsHostEntry("test2.com,10.0.0.3,1000,ADDRESSLIST"));
client.Open(router, clientSettings);
// Wait for everything to spin up.
Thread.Sleep(3000);
// Perform an A query and verify that we get both addresses in response.
response = DnsResolver.Query(IPAddress.Loopback, new DnsRequest(DnsFlag.NONE, "test1.com.", DnsQType.A), TimeSpan.FromSeconds(2));
Assert.AreEqual("test1.com.", response.QName);
Assert.AreEqual(DnsQType.A, response.QType);
Assert.AreEqual(2, response.Answers.Count);
Assert.IsNotNull(response.Answers.SingleOrDefault(r => ((A_RR)r).Address.Equals(IPAddress.Parse("10.0.0.1"))));
Assert.IsNotNull(response.Answers.SingleOrDefault(r => ((A_RR)r).Address.Equals(IPAddress.Parse("10.0.0.2"))));
}
finally
{
if (client != null)
{
client.Close();
}
if (handler != null)
{
handler.Stop();
}
}
}
private ServiceState state; // Current service state
/// <summary>
/// Constructor.
/// </summary>
public AppService()
{
this.router = null;
this.handler = null;
this.state = ServiceState.Stopped;
// Prepare the service to accept remote ServiceControl commands.
base.Open();
}
public void DynDnsHandler_Cluster_ADDRESSLIST()
{
// Start a Dynamic DNS service handler and a client, register two ADDRESSLIST
// records for TEST1.COM and confirm that A queries return both entries.
// I'm also going to add an ADDRESS record for TEST2.COM and verify that this address
// is never returned.
DynDnsHandler handler = null;
DynDnsClient client = null;
DnsResponse response;
try
{
handler = new DynDnsHandler();
handler.Start(router, null, null, null);
client = new DynDnsClient();
client.Register(new DynDnsHostEntry("test1.com,10.0.0.1,1000,ADDRESSLIST"));
client.Register(new DynDnsHostEntry("test1.com,10.0.0.2,1000,ADDRESSLIST"));
client.Register(new DynDnsHostEntry("test2.com,10.0.0.3,1000,ADDRESSLIST"));
client.Open(router, new DynDnsClientSettings("DynDnsClient"));
// Wait for all cluster members to come online and for
// the host registrations to be replicated.
WaitForOnline(handler.Cluster, waitTime);
WaitForOnline(client.Cluster, waitTime);
Thread.Sleep(2000);
// Perform an A query and verify that we get both addresses in response.
response = DnsResolver.Query(IPAddress.Loopback, new DnsRequest(DnsFlag.NONE, "test1.com.", DnsQType.A), TimeSpan.FromSeconds(2));
Assert.AreEqual("test1.com.", response.QName);
Assert.AreEqual(DnsQType.A, response.QType);
Assert.AreEqual(2, response.Answers.Count);
Assert.IsNotNull(response.Answers.SingleOrDefault(r => ((A_RR)r).Address.Equals(IPAddress.Parse("10.0.0.1"))));
Assert.IsNotNull(response.Answers.SingleOrDefault(r => ((A_RR)r).Address.Equals(IPAddress.Parse("10.0.0.2"))));
}
finally
{
if (client != null)
{
client.Close();
}
if (handler != null)
{
handler.Stop();
}
}
}
/// <summary>
/// Starts the service, associating it with an <see cref="IServiceHost" /> instance.
/// </summary>
/// <param name="serviceHost">The service user interface.</param>
/// <param name="args">Command line arguments.</param>
public void Start(IServiceHost serviceHost, string[] args)
{
lock (syncLock)
{
if (router != null)
{
return; // Already started
}
// Global initialization
NetTrace.Start();
Program.Config = new Config("LillTek.Datacenter.DynDNS");
Program.InstallPerfCounters();
// Service initialization
this.serviceHost = serviceHost;
SysLog.LogInformation("Dynamic DNS Service v{0} Start", Helper.GetVersionString());
try
{
router = new LeafRouter();
router.Start();
handler = new DynDnsHandler();
handler.Start(router, null, Program.PerfCounters, null);
state = ServiceState.Running;
}
catch (Exception e)
{
if (handler != null)
{
handler.Stop();
handler = null;
}
if (router != null)
{
router.Stop();
router = null;
}
SysLog.LogException(e);
throw;
}
}
}
/// <summary>
/// Handles the performance counter installation if they don't
/// already exist.
/// </summary>
/// <returns>The application's <see cref="PerfCounterSet" />.</returns>
public static PerfCounterSet InstallPerfCounters()
{
bool exists = PerformanceCounterCategory.Exists(Const.DynDnsPerf);
PerfCounterSet perfCounters;
perfCounters = new PerfCounterSet(false, true, Const.DynDnsPerf, Const.DynDnsName);
if (!exists)
{
DynDnsHandler.InstallPerfCounters(perfCounters, null);
perfCounters.Install();
}
return(perfCounters);
}
public void DynDnsHandler_Udp_CNAME()
{
// Start a Dynamic DNS service handler and a client, register CNAME
// records and confirm that CNAME queries return the proper results.
DynDnsClientSettings clientSettings;
DynDnsHandler handler = null;
DynDnsClient client = null;
DnsResponse response;
CNAME_RR record;
try
{
handler = new DynDnsHandler();
handler.Start(router, null, null, null);
clientSettings = new DynDnsClientSettings()
{
Mode = DynDnsMode.Udp,
NameServers = new NetworkBinding[] { new NetworkBinding("127.0.0.1:DYNAMIC-DNS") },
UdpRegisterInterval = TimeSpan.FromSeconds(1)
};
client = new DynDnsClient();
client.Register(new DynDnsHostEntry("test1.com,server.test1.com,1000,CNAME"));
client.Register(new DynDnsHostEntry("test2.com,server.test2.com,2000,CNAME"));
client.Open(router, clientSettings);
// Wait for everything to spin up.
Thread.Sleep(3000);
// Verify the single result for a CNAME query on test1.com
response = DnsResolver.Query(IPAddress.Loopback, new DnsRequest(DnsFlag.NONE, "test1.com.", DnsQType.CNAME), TimeSpan.FromSeconds(2));
Assert.AreEqual("test1.com.", response.QName);
Assert.AreEqual(DnsQType.CNAME, response.QType);
Assert.AreEqual(1, response.Answers.Count);
record = (CNAME_RR)response.Answers[0];
Assert.AreEqual("test1.com.", record.RName);
Assert.AreEqual("server.test1.com.", record.CName);
Assert.AreEqual(1000, record.TTL);
Thread.Sleep(2000);
// Verify the single result for a CNAME query on test2.com
response = DnsResolver.Query(IPAddress.Loopback, new DnsRequest(DnsFlag.NONE, "test2.com.", DnsQType.CNAME), TimeSpan.FromSeconds(2));
Assert.AreEqual("test2.com.", response.QName);
Assert.AreEqual(DnsQType.CNAME, response.QType);
Assert.AreEqual(1, response.Answers.Count);
record = (CNAME_RR)response.Answers[0];
Assert.AreEqual("test2.com.", record.RName);
Assert.AreEqual("server.test2.com.", record.CName);
Assert.AreEqual(2000, record.TTL);
}
finally
{
if (client != null)
{
client.Close();
}
if (handler != null)
{
handler.Stop();
}
}
}
public void DynDnsHandler_Udp_ADDRESS()
{
// Start a Dynamic DNS service handler and a client, register two ADDRESS
// records for TEST1.COM and confirm that A queries load balance across the two entries.
// I'm also going to add an ADDRESS record for TEST2.COM and verify that this address
// is never returned.
DynDnsClientSettings clientSettings;
DynDnsHandler handler = null;
DynDnsClient client = null;
DnsResponse response;
A_RR record;
bool found1;
bool found2;
try
{
handler = new DynDnsHandler();
handler.Start(router, null, null, null);
clientSettings = new DynDnsClientSettings()
{
Mode = DynDnsMode.Udp,
NameServers = new NetworkBinding[] { new NetworkBinding("127.0.0.1:DYNAMIC-DNS") },
UdpRegisterInterval = TimeSpan.FromSeconds(1)
};
client = new DynDnsClient();
client.Register(new DynDnsHostEntry("test1.com,10.0.0.1,1000,ADDRESS"));
client.Register(new DynDnsHostEntry("test1.com,10.0.0.2,1000,ADDRESS"));
client.Register(new DynDnsHostEntry("test2.com,10.0.0.3,1000,ADDRESS"));
client.Open(router, clientSettings);
// Wait for everything to spin up.
Thread.Sleep(3000);
// Loop 1000 times or until we got responses for both entry IP addresses. Note
// that there's a 1000:1 chance that this could be working properly and the test
// still fail.
found1 = false;
found2 = false;
for (int i = 0; i < 1000; i++)
{
response = DnsResolver.Query(IPAddress.Loopback, new DnsRequest(DnsFlag.NONE, "test1.com.", DnsQType.A), TimeSpan.FromSeconds(2));
Assert.AreEqual("test1.com.", response.QName);
Assert.AreEqual(DnsQType.A, response.QType);
Assert.AreEqual(1, response.Answers.Count);
record = (A_RR)response.Answers[0];
Assert.AreNotEqual(IPAddress.Parse("10.0.0.3"), record.Address);
if (IPAddress.Parse("10.0.0.1").Equals(record.Address))
{
found1 = true;
}
else if (IPAddress.Parse("10.0.0.2").Equals(record.Address))
{
found2 = true;
}
else
{
Assert.Fail();
}
if (found1 && found2)
{
break;
}
}
Assert.IsTrue(found1);
Assert.IsTrue(found2);
}
finally
{
if (client != null)
{
client.Close();
}
if (handler != null)
{
handler.Stop();
}
}
}
public void DynDnsHandler_Cluster_MX()
{
// Start a Dynamic DNS service handler and a client, register MX
// records and confirm that MX queries return the proper results.
DynDnsHandler handler = null;
DynDnsClient client = null;
DnsResponse response;
MX_RR record;
try
{
handler = new DynDnsHandler();
handler.Start(router, null, null, null);
client = new DynDnsClient();
client.Register(new DynDnsHostEntry("test1.com,mail1.test1.com,1000,MX"));
client.Register(new DynDnsHostEntry("test2.com,mail1.test2.com,2000,MX"));
client.Register(new DynDnsHostEntry("test2.com,mail2.test2.com,3000,MX"));
client.Open(router, new DynDnsClientSettings("DynDnsClient"));
// Wait for all cluster members to come online and for
// the host registrations to be replicated.
WaitForOnline(handler.Cluster, waitTime);
WaitForOnline(client.Cluster, waitTime);
Thread.Sleep(2000);
// Verify the single result for a MX query on test1.com
response = DnsResolver.Query(IPAddress.Loopback, new DnsRequest(DnsFlag.NONE, "test1.com.", DnsQType.MX), TimeSpan.FromSeconds(2));
Assert.AreEqual("test1.com.", response.QName);
Assert.AreEqual(DnsQType.MX, response.QType);
Assert.AreEqual(1, response.Answers.Count);
record = (MX_RR)response.Answers[0];
Assert.AreEqual("test1.com.", record.RName);
Assert.AreEqual("mail1.test1.com.", record.Exchange);
Assert.AreEqual(0, record.Preference);
Assert.AreEqual(1000, record.TTL);
Thread.Sleep(2000);
// Verify the two results for a MX query on test2.com
response = DnsResolver.Query(IPAddress.Loopback, new DnsRequest(DnsFlag.NONE, "test2.com.", DnsQType.MX), TimeSpan.FromSeconds(2));
Assert.AreEqual("test2.com.", response.QName);
Assert.AreEqual(DnsQType.MX, response.QType);
Assert.AreEqual(2, response.Answers.Count);
record = (MX_RR)response.Answers.Single(r => ((MX_RR)r).Exchange == "mail1.test2.com.");
Assert.AreEqual("test2.com.", record.RName);
Assert.AreEqual("mail1.test2.com.", record.Exchange);
Assert.AreEqual(0, record.Preference);
Assert.AreEqual(2000, record.TTL);
record = (MX_RR)response.Answers.Single(r => ((MX_RR)r).Exchange == "mail2.test2.com.");
Assert.AreEqual("test2.com.", record.RName);
Assert.AreEqual("mail2.test2.com.", record.Exchange);
Assert.AreEqual(0, record.Preference);
Assert.AreEqual(3000, record.TTL);
}
finally
{
if (client != null)
{
client.Close();
}
if (handler != null)
{
handler.Stop();
}
}
}
public void DynDnsHandler_Cluster_Basic()
{
// Start a Dynamic DNS service handler and then two enabled dynamic DNS
// clients and one disabled client.
//
// Register 2 hosts with different IP addresses on each client and
// then query the DNS several times for each host to verify that
// everything worked.
//
// Then stop one of the clients and verify that its host registrations
// are no longer returned in DNS responses.
DynDnsHandler handler = null;
DynDnsClient client1 = null;
DynDnsClient client2 = null;
DynDnsClient client3 = null;
try
{
handler = new DynDnsHandler();
handler.Start(router, null, null, null);
client1 = new DynDnsClient();
client1.Register(new DynDnsHostEntry("test1.com", IPAddress.Parse("10.0.0.1")));
client1.Register(new DynDnsHostEntry("test2.com", IPAddress.Parse("10.0.0.2")));
client1.Open(router, new DynDnsClientSettings("DynDnsClient"));
client2 = new DynDnsClient();
client2.Open(router, new DynDnsClientSettings("DynDnsClient"));
client2.Register(new DynDnsHostEntry("test1.com", IPAddress.Parse("10.0.1.1")));
client2.Register(new DynDnsHostEntry("test2.com", IPAddress.Parse("10.0.1.2")));
client3 = new DynDnsClient();
client3.Open(router, new DynDnsClientSettings("DynDnsClient.Disabled"));
client3.Register(new DynDnsHostEntry("test1.com", IPAddress.Parse("10.0.3.1")));
client3.Register(new DynDnsHostEntry("test2.com", IPAddress.Parse("10.0.3.2")));
// Wait for all cluster members to come online and for
// the host registrations to be replicated.
WaitForOnline(handler.Cluster, waitTime);
WaitForOnline(client1.Cluster, waitTime);
WaitForOnline(client2.Cluster, waitTime);
Thread.Sleep(2000);
// Perform the DNS lookups
bool found;
// Test1.com: 10.0.0.1
found = false;
for (int i = 0; i < 100; i++)
{
if (IPAddress.Parse("10.0.0.1").Equals(DnsLookup("test1.com")))
{
found = true;
break;
}
}
Assert.IsTrue(found);
// Test1.com: 10.0.1.1
found = false;
for (int i = 0; i < 100; i++)
{
if (IPAddress.Parse("10.0.1.1").Equals(DnsLookup("test1.com")))
{
found = true;
break;
}
}
Assert.IsTrue(found);
// Test2.com: 10.0.0.2
found = false;
for (int i = 0; i < 100; i++)
{
if (IPAddress.Parse("10.0.0.2").Equals(DnsLookup("test2.com")))
{
found = true;
break;
}
}
Assert.IsTrue(found);
// Test2.com: 10.0.1.2
found = false;
for (int i = 0; i < 100; i++)
{
if (IPAddress.Parse("10.0.1.2").Equals(DnsLookup("test2.com")))
{
found = true;
break;
}
}
Assert.IsTrue(found);
// Test case insensitivity
found = false;
for (int i = 0; i < 100; i++)
{
if (IPAddress.Parse("10.0.1.2").Equals(DnsLookup("TEST2.COM")))
{
found = true;
break;
}
}
Assert.IsTrue(found);
// Test for name not found.
try
{
Assert.IsNull(DnsLookup("error.com"));
Assert.Fail("Expected a DnsException");
}
catch (Exception e)
{
Assert.IsInstanceOfType(e, typeof(DnsException));
}
// Make sure that we don't see hosts from client3 since it
// is disabled.
// Test1.com: 10.0.3.1
found = false;
for (int i = 0; i < 100; i++)
{
if (IPAddress.Parse("10.0.3.1").Equals(DnsLookup("test1.com")))
{
found = true;
break;
}
}
Assert.IsFalse(found);
// Close client1 and verify that its registrations are no
// longer returned but that client2's still are.
client1.Close();
client1 = null;
Thread.Sleep(2000);
// Test1.com: 10.0.0.1
found = false;
for (int i = 0; i < 100; i++)
{
if (IPAddress.Parse("10.0.0.1").Equals(DnsLookup("test1.com")))
{
found = true;
break;
}
}
Assert.IsFalse(found);
// Test1.com: 10.0.1.1
found = false;
for (int i = 0; i < 100; i++)
{
if (IPAddress.Parse("10.0.1.1").Equals(DnsLookup("test1.com")))
{
found = true;
break;
}
}
Assert.IsTrue(found);
// Test2.com: 10.0.0.2
found = false;
for (int i = 0; i < 100; i++)
{
if (IPAddress.Parse("10.0.0.2").Equals(DnsLookup("test2.com")))
{
found = true;
break;
}
}
Assert.IsFalse(found);
// Test2.com: 10.0.1.2
found = false;
for (int i = 0; i < 100; i++)
{
if (IPAddress.Parse("10.0.1.2").Equals(DnsLookup("test2.com")))
{
found = true;
break;
}
}
Assert.IsTrue(found);
}
finally
{
if (client1 != null)
{
client1.Close();
}
if (client2 != null)
{
client2.Close();
}
if (handler != null)
{
handler.Stop();
}
}
}
public void DynDnsHandler_AddressCache()
{
// Verify that the server properly maintains a cache of specified hosts.
DynDnsHandler handler = null;
try
{
handler = new DynDnsHandler();
handler.Start(router, "LillTek.Datacenter.DynDNS.AddressCache", null, null);
// Wait for everything to spin up.
Thread.Sleep(10000);
// Verify that we have cached addresses for www.lilltek.com and www.google.com.
var addressCache = handler.GetCachedAddresses();
bool foundLillTek = false;
bool foundGoogle = false;
foreach (var entry in addressCache)
{
switch (entry.HostName.ToLower())
{
case "www.lilltek.com.":
foundLillTek = entry.Addresses != null && entry.Addresses.Length > 0;
break;
case "www.google.com.":
foundGoogle = entry.Addresses != null && entry.Addresses.Length > 0;
break;
}
}
Assert.IsTrue(foundLillTek);
Assert.IsTrue(foundGoogle);
// Now verify that CNAME lookups that alias to these hosts include A records.
DnsResponse response;
bool hasARecords;
// test1.lilltek.com is an alias for www.lilltek.com
response = DnsResolver.Query(IPAddress.Loopback, new DnsRequest(DnsFlag.NONE, "test1.lilltek.com.", DnsQType.CNAME), TimeSpan.FromSeconds(2));
hasARecords = false;
foreach (var record in response.Additional)
{
if (record.RRType == DnsRRType.A)
{
hasARecords = true;
break;
}
}
Assert.IsTrue(hasARecords);
// test1.lilltek.com is an alias for www.google.com
response = DnsResolver.Query(IPAddress.Loopback, new DnsRequest(DnsFlag.NONE, "test2.lilltek.com.", DnsQType.CNAME), TimeSpan.FromSeconds(2));
hasARecords = false;
foreach (var record in response.Additional)
{
if (record.RRType == DnsRRType.A)
{
hasARecords = true;
break;
}
}
Assert.IsTrue(hasARecords);
}
finally
{
if (handler != null)
{
handler.Stop();
}
}
}
