[SNMP4J] Sending V3 Informs
Elise Atkins
eatkins at tavve.com
Mon Jun 28 19:08:39 CEST 2010
Anybody tried sending a V3 inform? A V3 inform requires the target's
engine id, engine reboots and time. This information is not
automatically discovered for informs. I have tried using
Snmp.discoverAuthoritativeEngineID which does discover the engine id and
it is put into the inform pdu. But the engine reboots and engine time
are both set to 0, not the values returned from the
discoverAuthoritativeEngineID response PDU.
The code looks like:
MessageDispatcherImpl dispatcher = new MessageDispatcherImpl();
_snmp = new Snmp(dispatcher, new DefaultUdpTransportMapping());
USM usm = new USM(SecurityProtocols.getInstance(),
new OctetString(MPv3.createLocalEngineID()), 0);
SecurityModels.getInstance().addSecurityModel(usm);
MPv3 mp3 = new MPv3(usm);
dispatcher.addMessageProcessingModel(new MPv1());
dispatcher.addMessageProcessingModel(new MPv2c());
dispatcher.addMessageProcessingModel(mp3);
_snmp.listen();
UdpAddress address = new UdpAddress("10.254.1.45" + "/162");
UserTarget target = new UserTarget();
target.setTimeout(2000);
target.setAddress(address);
target.setSecurityLevel(SecurityLevel.NOAUTH_NOPRIV);
OctetString user = new OctetString("user1");
_snmp.getUSM().addUser(user,
new UsmUser(user, null, null, null, null));
((UserTarget)target).setSecurityName(user);
ScopedPDU pdu = new ScopedPDU();
pdu.setType(PDU.INFORM);
ResponseEvent response = _snmp.send(pdu, target);
_snmp.close();
The wireshark looks like:
No. Time Source Destination Protocol
Info
1 0.000000 10.254.1.64 10.254.1.45 SNMP
get-request
Frame 1 (103 bytes on wire, 103 bytes captured)
Ethernet II, Src: HewlettP_cd:2f:42 (00:24:81:cd:2f:42), Dst:
Supermic_43:f4:88 (00:30:48:43:f4:88)
Internet Protocol, Src: 10.254.1.64 (10.254.1.64), Dst: 10.254.1.45
(10.254.1.45)
User Datagram Protocol, Src Port: 53112 (53112), Dst Port: snmptrap (162)
Simple Network Management Protocol
msgVersion: snmpv3 (3)
msgGlobalData
msgAuthoritativeEngineID: <MISSING>
msgAuthoritativeEngineBoots: 0
msgAuthoritativeEngineTime: 0
msgUserName:
msgAuthenticationParameters: <MISSING>
msgPrivacyParameters: <MISSING>
msgData: plaintext (0)
plaintext
contextEngineID: <MISSING>
contextName: <MISSING>
data: get-request (0)
get-request
request-id: 0
error-status: noError (0)
error-index: 0
variable-bindings: 0 items
No. Time Source Destination Protocol
Info
2 0.000685 10.254.1.45 10.254.1.64 SNMP
report SNMP-USER-BASED-SM-MIB::usmStatsUnknownEngineIDs.0
Frame 2 (147 bytes on wire, 147 bytes captured)
Ethernet II, Src: Supermic_43:f4:88 (00:30:48:43:f4:88), Dst:
HewlettP_cd:2f:42 (00:24:81:cd:2f:42)
Internet Protocol, Src: 10.254.1.45 (10.254.1.45), Dst: 10.254.1.64
(10.254.1.64)
User Datagram Protocol, Src Port: snmptrap (162), Dst Port: 53112 (53112)
Simple Network Management Protocol
msgVersion: snmpv3 (3)
msgGlobalData
msgAuthoritativeEngineID: 80001F8880EF44283BEFC8284C
msgAuthoritativeEngineBoots: 1
msgAuthoritativeEngineTime: 3322
msgUserName:
msgAuthenticationParameters: <MISSING>
msgPrivacyParameters: <MISSING>
msgData: plaintext (0)
plaintext
contextEngineID: 80001F8880EF44283BEFC8284C
contextName: <MISSING>
data: report (8)
report
request-id: 0
error-status: noError (0)
error-index: 0
variable-bindings: 1 item
SNMP-USER-BASED-SM-MIB::usmStatsUnknownEngineIDs.0
(1.3.6.1.6.3.15.1.1.4.0): 11
Object Name: 1.3.6.1.6.3.15.1.1.4.0
(SNMP-USER-BASED-SM-MIB::usmStatsUnknownEngineIDs.0)
Scalar Instance Index: 0
SNMP-USER-BASED-SM-MIB::usmStatsUnknownEngineIDs: 11
No. Time Source Destination Protocol
Info
3 0.016482 10.254.1.64 10.254.1.45 SNMP
informRequest
Frame 3 (137 bytes on wire, 137 bytes captured)
Ethernet II, Src: HewlettP_cd:2f:42 (00:24:81:cd:2f:42), Dst:
Supermic_43:f4:88 (00:30:48:43:f4:88)
Internet Protocol, Src: 10.254.1.64 (10.254.1.64), Dst: 10.254.1.45
(10.254.1.45)
User Datagram Protocol, Src Port: 53112 (53112), Dst Port: snmptrap (162)
Simple Network Management Protocol
msgVersion: snmpv3 (3)
msgGlobalData
msgAuthoritativeEngineID: 80001F8880EF44283BEFC8284C
msgAuthoritativeEngineBoots: 0
msgAuthoritativeEngineTime: 0
msgUserName: user1
msgAuthenticationParameters: <MISSING>
msgPrivacyParameters: <MISSING>
msgData: plaintext (0)
plaintext
contextEngineID: 80001F8880EF44283BEFC8284C
contextName: <MISSING>
data: informRequest (6)
informRequest
request-id: 550721570
error-status: noError (0)
error-index: 0
variable-bindings: 0 items
No. Time Source Destination Protocol
Info
4 0.017038 10.254.1.45 10.254.1.64 SNMP
report SNMP-USER-BASED-SM-MIB::usmStatsUnknownUserNames.0
Frame 4 (155 bytes on wire, 155 bytes captured)
Ethernet II, Src: Supermic_43:f4:88 (00:30:48:43:f4:88), Dst:
HewlettP_cd:2f:42 (00:24:81:cd:2f:42)
Internet Protocol, Src: 10.254.1.45 (10.254.1.45), Dst: 10.254.1.64
(10.254.1.64)
User Datagram Protocol, Src Port: snmptrap (162), Dst Port: 53112 (53112)
Simple Network Management Protocol
msgVersion: snmpv3 (3)
msgGlobalData
msgAuthoritativeEngineID: 80001F8880EF44283BEFC8284C
msgAuthoritativeEngineBoots: 1
msgAuthoritativeEngineTime: 3322
msgUserName: user1
msgAuthenticationParameters: <MISSING>
msgPrivacyParameters: <MISSING>
msgData: plaintext (0)
plaintext
contextEngineID: 80001F8880EF44283BEFC8284C
contextName: <MISSING>
data: report (8)
report
request-id: 550721570
error-status: noError (0)
error-index: 0
variable-bindings: 1 item
SNMP-USER-BASED-SM-MIB::usmStatsUnknownUserNames.0
(1.3.6.1.6.3.15.1.1.3.0): 8
Object Name: 1.3.6.1.6.3.15.1.1.3.0
(SNMP-USER-BASED-SM-MIB::usmStatsUnknownUserNames.0)
Scalar Instance Index: 0
SNMP-USER-BASED-SM-MIB::usmStatsUnknownUserNames: 8
Elise Atkins
--
ZoneRanger "Management Through Firewalls" <http://www.tavve.com/?leadlander>
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