public static SnmpDatagram GetSnmpDatagram(IpPacket ipPacket)
{
var udpDatagram = ipPacket.ToUdpDatagram();
if (udpDatagram == default(UdpDatagram))
{
return(default(SnmpDatagram));
}
try
{
SnmpDatagram snmpDatagram;
var result = udpDatagram.TryParseSnmpDatagram(out snmpDatagram);
if (result)
{
return(snmpDatagram);
}
}
catch
{
// Ignored.
}
return(default(SnmpDatagram));
}
protected override bool TryParse(IpPacket packet, out IEnvelope envelope)
{
envelope = null;
if (!packet.PacketHeader.DestinationIpAddress.Equals(this.ListenEndPoint.Address))
{
return(false);
}
var upacket = packet.ToUdpDatagram(false);
var isValid = upacket.UdpDatagramHeader.DestinationPort == this.ListenEndPoint.Port;
if (isValid)
{
Syslog syslog;
try
{
syslog = SyslogParser.Parse(
upacket.UdpData,
upacket.ReceivedTime,
upacket.PacketHeader.SourceIpAddress.ToString());
}
catch (Exception)
{
return(false);
}
envelope = new SyslogEnvelope
{
OccurrenceTime = packet.ReceivedTime,
ReceivedTime = packet.ReceivedTime,
Payload = upacket.UdpData.Array,
PayloadInstance = syslog,
};
}
return(isValid);
}
protected override bool TryParse(IpPacket packet, out IEnvelope envelope)
{
envelope = null;
if (!packet.PacketHeader.DestinationIpAddress.Equals(this.ListenEndPoint.Address))
{
return(false);
}
var upacket = packet.ToUdpDatagram(false);
var isValid = upacket.UdpDatagramHeader.DestinationPort == this.ListenEndPoint.Port;
if (isValid)
{
SnmpDatagram datagram;
if (upacket.TryParseSnmpDatagram(out datagram))
{
isValid = datagram.Header.Version == SnmpVersion.V1 || datagram.Header.Version == SnmpVersion.V2C;
if (isValid)
{
envelope = new SnmpTrapEnvelope
{
OccurrenceTime = packet.ReceivedTime,
ReceivedTime = packet.ReceivedTime,
Payload = upacket.UdpData.Array,
PayloadInstance = new SnmpDatagram(
packet.ReceivedTime,
packet.PacketHeader.SourceIpAddress.ToString(),
datagram.Header,
datagram.VarBinds),
};
}
}
}
return(isValid);
}
