-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 After readings some more blogs and documentation I've learned how to convert an index string to a dotted-decimal, numeric OID. Looking up this OID works flawlessly.
I took the nsExtendOutput1Line OID and tacked on the length of the index string, followed by the decoded ASCII values for each letter, as documented in the FAQ (http://www.net-snmp.org/FAQ.html). The following two functions are how I implemented it in python. import netsnmp def snmp(thing, host): """ Perform an SNMP lookup of an index string on a host, return the result. """ var = netsnmp.Varbind(string_to_oid(thing)) result = netsnmp.snmpget(var, Version=2, DestHost=host, Community="public") return result[0] def string_to_oid(name): """ Convert an net-snmp string index to an OID. The OID starts with nsExtendOutput1Line, followed by the length of the string index, followed by the ASCII values for the individual characters. Returns a fully qualified, dotted-decimal, numeric OID. """ oid_prefix = "1.3.6.1.4.1.8072.1.3.2.3.1.1" ascii_values = [str(ord(element)) for element in list(name)] return ".".join(["", oid_prefix, str(len(name))]+ascii_values) I hope it might prove useful to someone. Kenny Rasschaert +32 497 72 27 69 | Open Source consultant - Inuits.eu On 12/03/2014 06:06 PM, Kenny Rasschaert wrote: > Hi, > > I'm using net-snmp 5.7.2 and the python bindings on CentOS 6. I've > added some extensions to my local net-snmp agent with the extend > keyword. They look like this: > > extend galera-seqno /usr/local/sbin/galera-status.sh seqno extend > galera-status /usr/local/sbin/galera-status.sh short > > With the snmp command line tools, they work as expected: [root@db01 > ~]# snmpwalk -v 2c -c public localhost > 'NET-SNMP-EXTEND-MIB::nsExtendObjects' > NET-SNMP-EXTEND-MIB::nsExtendNumEntries.0 = INTEGER: 2 > NET-SNMP-EXTEND-MIB::nsExtendCommand."galera-seqno" = STRING: > /usr/local/sbin/galera-status.sh > NET-SNMP-EXTEND-MIB::nsExtendCommand."galera-status" = STRING: > /usr/local/sbin/galera-status.sh > NET-SNMP-EXTEND-MIB::nsExtendArgs."galera-seqno" = STRING: seqno > NET-SNMP-EXTEND-MIB::nsExtendArgs."galera-status" = STRING: short > NET-SNMP-EXTEND-MIB::nsExtendInput."galera-seqno" = STRING: > NET-SNMP-EXTEND-MIB::nsExtendInput."galera-status" = STRING: > NET-SNMP-EXTEND-MIB::nsExtendCacheTime."galera-seqno" = INTEGER: 5 > NET-SNMP-EXTEND-MIB::nsExtendCacheTime."galera-status" = INTEGER: > 5 NET-SNMP-EXTEND-MIB::nsExtendExecType."galera-seqno" = INTEGER: > exec(1) NET-SNMP-EXTEND-MIB::nsExtendExecType."galera-status" = > INTEGER: exec(1) > NET-SNMP-EXTEND-MIB::nsExtendRunType."galera-seqno" = INTEGER: > run-on-read(1) NET-SNMP-EXTEND-MIB::nsExtendRunType."galera-status" > = INTEGER: run-on-read(1) > NET-SNMP-EXTEND-MIB::nsExtendStorage."galera-seqno" = INTEGER: > permanent(4) NET-SNMP-EXTEND-MIB::nsExtendStorage."galera-status" = > INTEGER: permanent(4) > NET-SNMP-EXTEND-MIB::nsExtendStatus."galera-seqno" = INTEGER: > active(1) NET-SNMP-EXTEND-MIB::nsExtendStatus."galera-status" = > INTEGER: active(1) > NET-SNMP-EXTEND-MIB::nsExtendOutput1Line."galera-seqno" = STRING: > -1 NET-SNMP-EXTEND-MIB::nsExtendOutput1Line."galera-status" = > STRING: stopped > NET-SNMP-EXTEND-MIB::nsExtendOutputFull."galera-seqno" = STRING: > -1 NET-SNMP-EXTEND-MIB::nsExtendOutputFull."galera-status" = > STRING: stopped > NET-SNMP-EXTEND-MIB::nsExtendOutNumLines."galera-seqno" = INTEGER: > 1 NET-SNMP-EXTEND-MIB::nsExtendOutNumLines."galera-status" = > INTEGER: 1 NET-SNMP-EXTEND-MIB::nsExtendResult."galera-seqno" = > INTEGER: 0 NET-SNMP-EXTEND-MIB::nsExtendResult."galera-status" = > INTEGER: 1 NET-SNMP-EXTEND-MIB::nsExtendOutLine."galera-seqno".1 = > STRING: -1 NET-SNMP-EXTEND-MIB::nsExtendOutLine."galera-status".1 = > STRING: stopped > > and: [root@db01 ~]# snmpget -v 2c -c public localhost > 'NET-SNMP-EXTEND-MIB::nsExtendOutLine."galera-status".1' > NET-SNMP-EXTEND-MIB::nsExtendOutLine."galera-status".1 = STRING: > stopped > > I'm doing some python scripting where I would love to get this > data over snmp, I was very pleased to discover that net-snmp comes > with python bindings. > > Walking over 'NET-SNMP-EXTEND-MIB::nsExtendObjects' works: >>>> import netsnmp session = netsnmp.Session(Version = 2, >>>> DestHost="localhost", > Community="public") >>>> > session.walk(netsnmp.VarList(netsnmp.Varbind("NET-SNMP-EXTEND-MIB::nsExtendObjects"))) > > ('2', '/usr/local/sbin/galera-status.sh', > '/usr/local/sbin/galera-status.sh', 'seqno', 'short', None, None, > '5', '5', '1', '1', '1', '1', '4', '4', '1', '1', '-1', 'stopped', > '-1', 'stopped', '1', '1', '0', '1', '-1', 'stopped') > > Getting the output for both my extensions has also worked: >>>> > session.walk(netsnmp.VarList(netsnmp.Varbind("NET-SNMP-EXTEND-MIB::nsExtendOutLine"))) > > ('-1', 'stopped') > > I can not, however, seem to get just the output for a specific > extension: >>>> > session.walk(netsnmp.VarList(netsnmp.Varbind('NET-SNMP-EXTEND-MIB::nsExtendOutLine."galera-short"'))) > > () >>>> > session.walk(netsnmp.VarList(netsnmp.Varbind('NET-SNMP-EXTEND-MIB::nsExtendOutLine."galera-short".1'))) > > () >>>> > session.get(netsnmp.VarList(netsnmp.Varbind('NET-SNMP-EXTEND-MIB::nsExtendOutLine."galera-short".1'))) > > ('',) > > I have tried about 500 variations and have furiously googled and > read documentation, blogs, guides and tutorials... without > success. > > And now, in my hour of desperation, I turn to the mailing list. Can > you please point me in the right direction? > > Humbly yours, > > ------------------------------------------------------------------------------ > > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! Instantly Supercharge Your Business Reports and > Dashboards with Interactivity, Sharing, Native Excel Exports, App > Integration & more Get technology previously reserved for > billion-dollar corporations, FREE > http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk > > _______________________________________________ > Net-snmp-users mailing list Net-snmp-users@lists.sourceforge.net > Please see the following page to unsubscribe or change other > options: > https://lists.sourceforge.net/lists/listinfo/net-snmp-users > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJUgF9NAAoJEB9wRUEh5BQZ0r4QAJZn6CSux+gMnKXl4R8zPt18 CeTObXDQgwQFMr9AB3TH/2/NcmFkeUfoStVu1MfhQgbDFD4gSRNw5ThEa/Q5DgVj w/0LA8V68ke6zPgyEvh8+uSpcK7SHQLP7xcHRx5EjQRXrEukwbWe+LsKBz2VxoEt MK60DCU7gr70YgNpIpnWr2EXlV3I1SB26+Cvk287+NRa0spjGKMoGtiyeSQ/f3pi enGTk6frepCnzJmszaPRSsJP1wUlmW+eXUOBWy54VovorFne7afW10yP3b3iOWcT oGgzMoRQ4upglOL9zIxFPE9WOm1XF2+rs22yRSLuxrYG1mewDKjFvAVuGu7qccmB FnClm6aluZSEHtjbqOaqUzJhd/CbGqvmSswmWLJWn3k+8k51p0HEvNB+IhlpWPrD Lfxn2C9lu+iuLtYjDaC9hbRKzPK5DeFpB2PqCj2sDHPFl5UYhks+tZZYtZz+gLjN 17YTMbcaTSFdVDTMGufCjTtQUNOIiyLgg405gvKaox/V8XaP7YZ8FdGEl5ywB0yD Gi4WaGCb7gyMQJb8BEDqdPs39oHcm+OUunpW8TZpeBwbUS0HtCQ8UAe+VrWCxtZu 07BzKriezcBg801T1j4Y0sypeyvn7h32CI5xTtucK6XQGEQHtNtjpUXObQSIyVTO QqzbnG2uki15ANrqxFZU =6t61 -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk _______________________________________________ Net-snmp-users mailing list Net-snmp-users@lists.sourceforge.net Please see the following page to unsubscribe or change other options: https://lists.sourceforge.net/lists/listinfo/net-snmp-users
