private UsmConfig FindPeer(string engineId, string securityName)
{
if (engineId != null)
{
foreach (UsmConfig current in this.usmConfigs)
{
if (current.IsMatch(engineId, securityName))
{
UsmConfig result = current;
return(result);
}
}
}
foreach (UsmConfig current2 in this.usmConfigs)
{
if (current2.IsMatch(securityName))
{
UsmConfig result = current2;
return(result);
}
}
return(null);
}
public TrapMessage Handler(AbstractSocketData socketData)
{
if (socketData == null)
{
return(null);
}
TrapMessage result;
try
{
int dataLenth = socketData.DataLenth;
byte[] dataBytes = socketData.DataBytes;
int protocolVersion = SnmpPacket.GetProtocolVersion(dataBytes, dataLenth);
TrapMessage trapMessage;
SnmpPacket snmpPacket;
if (protocolVersion == 0)
{
trapMessage = new TrapV1Message();
snmpPacket = new SnmpV1TrapPacket();
((SnmpV1TrapPacket)snmpPacket).decode(dataBytes, dataLenth);
}
else
{
if (protocolVersion == 1)
{
trapMessage = new TrapV2Message();
snmpPacket = new SnmpV2Packet();
((SnmpV2Packet)snmpPacket).decode(dataBytes, dataLenth);
if (snmpPacket.Pdu.Type != PduType.V2Trap)
{
throw new SnmpException("Invalid SNMP version 2 packet type received.");
}
}
else
{
trapMessage = new TrapV3Message();
snmpPacket = new SnmpV3Packet();
UserSecurityModel uSM = ((SnmpV3Packet)snmpPacket).GetUSM(dataBytes, dataLenth);
if (uSM.EngineId.Length <= 0)
{
throw new SnmpException("Invalid packet. Authoritative engine id is not set.");
}
if (uSM.SecurityName.Length <= 0)
{
throw new SnmpException("Invalid packet. Security name is not set.");
}
if (this.usmConfigs.Count > 0)
{
UsmConfig usmConfig = this.FindPeer(uSM.EngineId.ToString(), uSM.SecurityName.ToString());
if (usmConfig == null)
{
throw new SnmpException("SNMP packet from unknown peer.");
}
((SnmpV3Packet)snmpPacket).USM.Authentication = (AuthenticationDigests)usmConfig.Authentication;
((SnmpV3Packet)snmpPacket).USM.Privacy = (PrivacyProtocols)usmConfig.Privacy;
if (usmConfig.Privacy != Privacy.None)
{
((SnmpV3Packet)snmpPacket).USM.PrivacySecret.Set(usmConfig.PrivacySecret);
}
if (usmConfig.Authentication != Authentication.None)
{
((SnmpV3Packet)snmpPacket).USM.AuthenticationSecret.Set(usmConfig.AuthenticationSecret);
}
}
((SnmpV3Packet)snmpPacket).decode(dataBytes, dataLenth);
if (snmpPacket.Pdu.Type != PduType.V2Trap)
{
throw new SnmpException("Invalid SNMP version 3 packet type received.");
}
}
}
trapMessage.AgentIpAddress = socketData.Target;
trapMessage.Port = socketData.Port;
SnmpTrapHandler.configTrap(trapMessage, protocolVersion, snmpPacket);
this.configVb(trapMessage, protocolVersion, snmpPacket);
result = trapMessage;
}
catch (System.Exception ex)
{
System.Console.WriteLine(ex.Message);
result = null;
}
return(result);
}
