public override bool HandleMembership()
{
var request = Request;
var parameters = request.Parameters;
var typeCode = Request.TypeCode();
if (typeCode == SnmpType.Unknown)
{
HandleFailure(Group.DecryptionError);
return(false);
}
if (typeCode != SnmpType.TrapV2Pdu && parameters.EngineId != Group.EngineId)
{
HandleDiscovery();
return(true);
}
var user = Users.Find(parameters.UserName);
if (user == null)
{
HandleFailure(Group.UnknownSecurityName);
return(false);
}
if (typeCode == SnmpType.TrapV2Pdu && (user.EngineIds == null || !user.EngineIds.Contains(parameters.EngineId)))
{
HandleFailure(Group.UnknownEngineId);
return(false);
}
if (parameters.IsInvalid)
{
HandleFailure(Group.AuthenticationFailure);
return(false);
}
if (typeCode == SnmpType.TrapV2Pdu)
{
return(true);
}
if ((user.ToSecurityLevel() | Levels.Reportable) != request.Header.SecurityLevel)
{
HandleFailure(Group.UnsupportedSecurityLevel);
return(false);
}
var inTime = EngineGroup.IsInTime(Group.EngineTimeData, parameters.EngineBoots.ToInt32(), parameters.EngineTime.ToInt32());
if (!inTime)
{
HandleFailure(Group.NotInTimeWindow);
return(false);
}
return(true);
}
/// <summary>
/// Initializes a new instance of the <see cref="SnmpContextBase"/> class.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="sender">The sender.</param>
/// <param name="users">The users.</param>
/// <param name="group">The engine core group.</param>
/// <param name="binding">The binding.</param>
protected SnmpContextBase(ISnmpMessage request, IPEndPoint sender, UserRegistry users, EngineGroup group, IListenerBinding binding)
{
Request = request;
Binding = binding;
Users = users;
Sender = sender;
CreatedTime = DateTime.Now;
Group = group;
}
/// <summary>
/// Initializes a new instance of the <see cref="SnmpContextBase"/> class.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="sender">The sender.</param>
/// <param name="users">The users.</param>
/// <param name="group">The engine core group.</param>
/// <param name="binding">The binding.</param>
protected SnmpContextBase(ISnmpMessage request, IPEndPoint sender, UserRegistry users, EngineGroup group, IListenerBinding binding)
{
Request = request;
Binding = binding;
Users = users;
Sender = sender;
CreatedTime = DateTime.Now;
Group = group;
}
/// <summary>
/// Creates the specified request.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="sender">The sender.</param>
/// <param name="users">The users.</param>
/// <param name="group">The engine group.</param>
/// <param name="binding">The binding.</param>
/// <returns></returns>
public static SnmpContext Create(ISnmpMessage request, IPEndPoint sender, UserRegistry users, EngineGroup group, IListenerBinding binding)
{
if (request.Version == VersionCode.V3)
{
return new SecureSnmpContext(request, sender, users, group, binding);
}
return new NormalSnmpContext(request, sender, users, binding);
}
/// <summary>
/// Handles the membership.
/// </summary>
/// <returns></returns>
public override bool HandleMembership()
{
var request = Request;
var parameters = request.Parameters;
var typeCode = Request.TypeCode();
if (parameters.EngineId != Group.EngineId && typeCode != SnmpType.Unknown)
{
HandleDiscovery();
return true;
}
var user = Users.Find(parameters.UserName);
if (user == null)
{
HandleFailure(Group.UnknownSecurityName);
return false;
}
if (typeCode == SnmpType.Unknown)
{
HandleFailure(Group.DecryptionError);
return false;
}
if (parameters.IsInvalid)
{
HandleFailure(Group.AuthenticationFailure);
return false;
}
if ((user.ToSecurityLevel() | Levels.Reportable) != request.Header.SecurityLevel)
{
HandleFailure(Group.UnsupportedSecurityLevel);
return false;
}
// TODO: improve here, so if request's EngineBoots = agent's EngineBoots - 1 we can calculate if it is in time.
if (parameters.EngineBoots.ToInt32() != Group.EngineBoots)
{
HandleFailure(Group.NotInTimeWindow);
return false;
}
var inTime = EngineGroup.IsInTime(Group.EngineTime, parameters.EngineTime.ToInt32());
if (!inTime)
{
HandleFailure(Group.NotInTimeWindow);
return false;
}
return true;
}
/// <summary>
/// Creates the specified request.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="sender">The sender.</param>
/// <param name="users">The users.</param>
/// <param name="group">The engine group.</param>
/// <param name="binding">The binding.</param>
/// <returns></returns>
public static ISnmpContext Create(ISnmpMessage request, IPEndPoint sender, UserRegistry users, EngineGroup group, IListenerBinding binding)
{
if (request.Version == VersionCode.V3)
{
return new SecureSnmpContext(request, sender, users, group, binding);
}
return new NormalSnmpContext(request, sender, users, binding);
}
/// <summary>
/// Initializes a new instance of the <see cref="SnmpEngine"/> class.
/// </summary>
/// <param name="factory">The factory.</param>
/// <param name="listener">The listener.</param>
/// <param name="group">Engine core @group.</param>
public SnmpEngine(SnmpApplicationFactory factory, Listener listener, EngineGroup @group)
{
_factory = factory;
Listener = listener;
_group = group;
}
/// <summary>
/// Initializes a new instance of the <see cref="SecureSnmpContext"/> class.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="sender">The sender.</param>
/// <param name="users">The users.</param>
/// <param name="group">The engine core group.</param>
/// <param name="binding">The binding.</param>
public SecureSnmpContext(ISnmpMessage request, IPEndPoint sender, UserRegistry users, EngineGroup group, IListenerBinding binding)
: base(request, sender, users, group, binding)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="SecureSnmpContext"/> class.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="sender">The sender.</param>
/// <param name="users">The users.</param>
/// <param name="group">The engine core group.</param>
/// <param name="binding">The binding.</param>
public SecureSnmpContext(ISnmpMessage request, IPEndPoint sender, UserRegistry users, EngineGroup group, IListenerBinding binding)
: base(request, sender, users, group, binding)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="SnmpEngine"/> class.
/// </summary>
/// <param name="factory">The factory.</param>
/// <param name="listener">The listener.</param>
/// <param name="group">Engine core group.</param>
public SnmpEngine(SnmpApplicationFactory factory, Listener listener, EngineGroup group)
{
_factory = factory;
Listener = listener;
_group = group;
}