Mike,
I don't know what kind of MIB are you trying to develop. It would be nice if
you could post it. I had a similar problem and I decided to implement a so
called command line MIB like this:
+--CommandLineMib(5)
+--CommandLineModule(1)
| +--CommandLineGroup(1)
|
+-- -RW- String CommandLine(2)
| Textual Convention: DisplayString
| Size: 0..255
+-- -R-- EnumVal CommandProgress(3)
| Values: ok(1), error(2), pending(3)
+-- -R-- String CommandResult(4)
Textual Convention: DisplayString
Size: 0..255
With mib2c I generated the corresponding .c and .h files, then I added extra
code to do a system(CommandLine) when doing an snmpset to CommandLine and to
get the command result in CommandResult. I compiled it as an standalone
subagent application with net-snmp-config --compile-subagent spdCommandLineMib
spdCommandLineMib.c
When I execute the obtained standalone subagent (./CommandLine), it registers
with the master SNMP agent and then I can do things like this:
$ snmpset -v 2c -c private localhost CommandLine.0 = "pwd"
COMMAND-LINE-MIB::CommandLine.0 = STRING: pwd
$ snmpget -v 2c -c public localhost CommandResult.0
COMMAND-LINE-MIB::CommandResult.0 = STRING: /
References I followed and read (in order of access):
http://www.net-snmp.org/docs/readmefiles.html
http://www.net-snmp.org/wiki/index.php/Tutorials
http://www.net-snmp.org/wiki/index.php/FAQ:Coding_01
http://www.net-snmp.org/wiki/index.php/TUT:Writing_a_Subagent
http://www.net-snmp.org/tutorial/tutorial-5/toolkit/mib_module/
http://www.net-snmp.org/tutorial/tutorial-5/toolkit/demon/example-demon.c
HTH,
David
De: Mike Smith [mailto:msm...@cellwatch.com]
Enviado el: miércoles, 27 de enero de 2016 21:19
Para: net-snmp-users@lists.sourceforge.net
Asunto: unsorted-external data access model
I'm a complete novice to SNMP, and have had to assume responsibility on a
development abandoned by a former associate. I want to develop a subagent to
handle data requests, and my data is accessible from another
process/application that communicates via a private messaging API. Thus, I
believe the "unsorted-external" model is a best-fit. However, I'm very
confused by the data flow required. Using the mib2c generator, I got a couple
of ReadMe text files describing parts of the process, but now I'm more confused
than ever!
The ReadMe describing the generated code refers several times to
"<...>_loop_init_context()" function, but no such function exists anywhere else
except in a comment within <...>_data_access.c. Is this a function I'm meant
to create? If so, why isn't there at least a place-holder indicating where it
should be or when to call it?
=mike smith
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