private async Task BackgroundProcessing(CancellationToken stoppingToken)
{
while (!stoppingToken.IsCancellationRequested)
{
using (var scope = _serviceProvider.CreateScope())
{
var repository = scope.ServiceProvider.GetRequiredService <ITrapUsersRepository>();
if (await repository.HasNewUsers(_activeTrapUsers, stoppingToken))
{
_activeTrapUsers = await repository.GetUsers();
var ports = _activeTrapUsers.Select(usr => usr.Port).Distinct();
var users = new UserRegistry();
users.Add(new OctetString("neither"), DefaultPrivacyProvider.DefaultPair);
foreach (var trapUser in _activeTrapUsers)
{
IPrivacyProvider provider;
if (trapUser.EncryptionType == EncryptionType.DES)
{
provider = new DESPrivacyProvider(
new OctetString(trapUser.Encryption),
new MD5AuthenticationProvider(new OctetString(trapUser.Password)))
{
EngineIds = new List <OctetString> {
new OctetString(ByteTool.Convert(trapUser.EngineId))
}
};
}
else
{
provider = new AESPrivacyProvider(
new OctetString(trapUser.Encryption),
new MD5AuthenticationProvider(new OctetString(trapUser.Password)))
{
EngineIds = new List <OctetString> {
new OctetString(ByteTool.Convert(trapUser.EngineId))
}
};
}
users.Add(new OctetString(trapUser.UserName), provider);
}
var trap = new TrapV2MessageHandler();
trap.MessageReceived += TrapMessageReceived;
var trapv2Mapping = new HandlerMapping("v2,v3", "TRAPV2", trap);
//sudo snmptrap -v3 -e 0x090807060504030201 -l authPriv -u snmpro -a MD5 -A STrP@SSWRD -x DES -X STr0ngP@SSWRD 192.168.0.110:162 '' 1.3.6.1.4.1.8072.2.3.0.1 1.3.6.1.4.1.8072.2.3.2.1 s "Example Message"
var inform = new InformRequestMessageHandler();
inform.MessageReceived += InformMessageReceived;
var informMapping = new HandlerMapping("v2,v3", "INFORM", inform);
var membership = new ComposedMembershipProvider(new IMembershipProvider[]
{
new Version1MembershipProvider(new OctetString("public"), new OctetString("public")),
new Version2MembershipProvider(new OctetString("public"), new OctetString("public")),
new Version3MembershipProvider()
});
var handlerFactory = new MessageHandlerFactory(new[] { trapv2Mapping, informMapping });
var pipelineFactory = new SnmpApplicationFactory(new ObjectStore(), membership, handlerFactory);
if (_engine?.Active ?? false)
{
_engine.Stop();
_engine.Dispose();
}
_engine = new SnmpEngine(pipelineFactory, new Listener {
Users = users
}, new EngineGroup());
foreach (var port in ports)
{
_engine.Listener.AddBinding(new IPEndPoint(IPAddress.Any, port));
}
_engine.Start();
}
}
await Task.Delay(5000, stoppingToken);
}
}
public void Close()
{
_engine.Stop();
_engine.Dispose();
}