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java.lang.Objectorg.apache.log4j.ext.NetSnmpCommandLineTrapSender
public class NetSnmpCommandLineTrapSender
Title: NetSnmpCommandLineTrapSender
Description: This class makes use of the NetSNMP snmptrap utility to
send traps that implement the underlying SNMP protocol(s).
NOTE: this class is intended primarily as a "proof-of-concept", and to serve
as an example of a possible usage of a command line trap sending utility with
the appender. This class is not intended for production-grade environments!
You can get a copy of NetSNMP here.
You will need a copy of the library (e.g. "snmptrap.exe" and "libsnmp.dll" on Win32
platforms, at a minimum) to use this class.
This sender launches a separate process, calling the NetSnmp utility "snmptrap" to
send a trap. Because this sender's job is to start an operating system process,
it needs to know things that are not readily available to it via the normal avenues
open to a Log4J Appender. In particular, it needs to know the location of
the NetSnmp binaries (the file system path), and the path to the MIB files used
by NetSnmp. You communicate this information to the sender using Java System
Properties.
The path to the NetSnmp binaries is set via the property
"log4j.ext.snmpTrapAppender.netSnmp.binPath". If not set, the sender defaults to a value
of "/usr/local/bin/".
The path to the NetSnmp MIBs is set via the property
"log4j.ext.snmpTrapAppender.netSnmp.mibsPath". If not set, the sender defaults to a value
of "/usr/local/share/mibs".
You can also get the sender to emit some diagnostic/debugging information by setting the
value of the "log4j.ext.snmpTrapAppender.netSnmp.diagnostic" property to "true".
Thus, as an example, the following options to the "java" command line set the binary path,
the MIB path and the diagnostic flag for this sender:
-Dlog4j.ext.snmpTrapAppender.netSnmp.binPath="D:\\apps\\ucd-snmp-4.2.3-win32\\usr\\bin\\"
-Dlog4j.ext.snmpTrapAppender.netSnmp.mibsPath="D:\\apps\\ucd-snmp-4.2.3-win32\\usr\\mibs"
-Dlog4j.ext.snmpTrapAppender.netSnmp.diagnostic="true"
Constructor Summary | |
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NetSnmpCommandLineTrapSender()
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Method Summary | |
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void |
addTrapMessageVariable(java.lang.String applicationTrapOIDValue,
java.lang.String value)
Adds a new Varbind to the SNMP PDU. |
void |
initialize(java.lang.String managementHostValue,
int managementHostTrapListenPortValue,
java.lang.String enterpriseOIDValue,
java.lang.String localIPAddressValue,
int localTrapSendPortValue,
int genericTrapTypeValue,
int specificTrapTypeValue,
java.lang.String communityStringValue,
long sysUpTimeValue)
This method is called to set the values of all of the class fields used as parameters to the underlying SNMP API. |
void |
sendTrap()
Sends the PDU defined by the variables of the fields of this class. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public NetSnmpCommandLineTrapSender()
Method Detail |
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public void initialize(java.lang.String managementHostValue, int managementHostTrapListenPortValue, java.lang.String enterpriseOIDValue, java.lang.String localIPAddressValue, int localTrapSendPortValue, int genericTrapTypeValue, int specificTrapTypeValue, java.lang.String communityStringValue, long sysUpTimeValue)
SnmpTrapSenderFacade
initialize
in interface SnmpTrapSenderFacade
managementHostValue
- - the numeric IP address of the host
to which traps should be sent, e.g. "10.255.255.1".
managementHostTrapListenPortValue
- - any valid TCP/IP port
number. This is the port that the host specified in the
"managementHostValue" variable will listen on for SNMP traps.
enterpriseOIDValue
- - formatted as an OID
E.g. "1.3.6.1.2.1.1.2.0" -- this OID would point to the standard
sysObjectID of the "systemName" node of the standard "system" MIB.
localIPAddressValue
- - an IP address, as a String, in
numeric, dotted decimal format. E.g. "10.255.255.2". This is the IP
address of the host that is using this appender to send SNMP traps.
This address will be encoded in the SNMP PDU, and used to provide
things like the "agent"'s IP address.
localTrapSendPortValue
- - the port that should be used on the
local host by the appender to send the trap.
genericTrapTypeValue
- - generic trap type for this SNMP PDU.
One of the following values (from the SNMP standard):specificTrapTypeValue
- - any value within the range defined
for an INTEGER in the ASN.1/BER notation; i.e. -128 to 127.
communityStringValue
- - E.g. "public".
sysUpTimeValue
- - this is meant to be the amount of time, in
seconds, elapsed since the last re-start or re-initialization of the
calling application. Of course, to set this, your application needs
to keep track of the value.public void addTrapMessageVariable(java.lang.String applicationTrapOIDValue, java.lang.String value)
SnmpTrapSenderFacade
addTrapMessageVariable
in interface SnmpTrapSenderFacade
applicationTrapOIDValue
- - formatted as an OID
E.g. "1.3.6.1.2.1.1.2.0.0.0.0" -- this OID would point to the standard
sysObjectID of the "systemName" node of the standard "system" MIB.
value
- - the text to append to the Varbind that will be added to
the SNMP PDU.public void sendTrap()
SnmpTrapSenderFacade
sendTrap
in interface SnmpTrapSenderFacade
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