I have a C++ program built around glibmm Main Event Loop and need to create an
SNMP AgentX in it to be used along Net-SNMP own snmpd. I can't find any
information how to integrate it other than the Tutorial "Instrumenting your own
code with agentx subagent support" which I find a little shortcoming.
How do I tie an Net-SNMP AgentX into my the glibmm Main Event Loop ? Perhaps it
would be easier to use SNMP++/Agent++/AgentX++ instead of net-snmp.
All communication to the device happens with sending/receiving XML messages.
The program operates in stages, when receiving signals from various
parts/managers. I first query the device for all information it has available.
When it is received and processed I send a signal that is picked up by
my_client so that it can begin to create the MIB file from this information,
and then register the scalars. Another one of these signals indicate that the
data for SNMP request have been received from device. When I get incoming SNMP
requests I need to wait for this signal before I send the response to the SNMP
manager/requester.
Some of my Code:
main.cpp
int main(int argc, char **argv) {
//Needs some code here for SNMP initialization.
http://www.net-snmp.org/tutorial/tutorial-5/toolkit/demon/example-demon.c
my_client client();
client.run(); //The Main Event Loop executing within this call to client.run().
return (1);
}
my_client.cpp
my_client::my_client( ) :
_mainloop(Glib::MainLoop::create()) {
//Define signals
_manager1.signal_finished().connect(sigc::mem_fun(*this,
&my_client::manager1_finished));
Glib::signal_idle().connect(sigc::bind_return(sigc::mem_fun(*this,
&my_client::connection), false));
}
void
my_client::run() {
_mainloop->run();
}
bool
my_client::connection() {
//Getting information from device using manager1.
...
}
void
my_client::manager1_finished(bool finished) {
//...Creating MIB file
//...Register all scalars
for (All Scalars) {
netsnmp_register_scalar_group(
netsnmp_create_handler_registration( text,
handle_snmp,
group_oid,
OID_LENGTH(group_oid),
HANDLER_CAN_RONLY
), 1, scalars_total);
}
}
int
handle_snmp(netsnmp_mib_handler *handler,
netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests) {
//Sending SNMP request to client....
//THIS MUST BE DONE WHEN I RECEIVE SIGNAL FROM ONE OF MY MANAGERS
//THAT THE DATA IS READY/RETRIEVED FROM DEVICE. AND NOT BEFORE.
snmp_set_var_typed_value(requests->requestvb,
type,
datapointer,
length);
}
What I need is to bake this handle_snmp into my Main Event Loop so that
snmp_set_var_typed_value is called when I receive a signal that I have gotten
the value from the device.
This is what I have for now:
1. C++ program running a Main Event Loop. Functions/Routines for querying
the device and creating a MIB definition file.
2. Standalone C MIB module, And an snmp-deamon.c containing "main" and
net-snmp initialization(instead of using net-snmp-config --compile-subagent).
An example agent made from the Net-SNMP tutorials.
I am not sure how to tie these two parts together. The class my_client is
responsible for communicating with the device, handles all the signals, create
the MIB definition, registers the scalars, and retrieves the information needed
from the device.
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