On Thu, 28 Mar 2024 at 00:13, Bart Van Assche <bvanass...@acm.org> wrote:
> Thanks for the background information. I'm not sure the Net-SNMP API needs > to be modified to realize this. How about the following approach: > > - Use netsnmp_register_handler() in MIB implementations to associate > OIDs with callback functions. > - In the handler callback function, use the > reqinfo->asp->session->local_port information. > - Make sure that session->local_port is set correctly. This may > require a code change in Net-SNMP. > > > Hi Bart, I have gone through the above very helpful steps, as follows: A snmpd was set to listen on 10 ports through multiple entries like “agentaddress tcp:<port>” in the snmpd.conf file. It was verified through snmpget that the snmpd listens on all 10 ports. Function “netsnmp_callback_open” in file snmplib/transports/snmpCallbackDomain.c was patched to write a few debug messages. It appears that the function “netsnmp_callback_open” is called once. It sets the “callback_ss->local_port” to “((netsnmp_callback_info *) callback_tr->data)->callback_num”, which is 1. In the handler callback function, the reqinfo->asp->session->local_port is 0 while processing each snmpget. You wrote "Make sure that session->local_port is set correctly." I studied the code to set this properly, but didn't manage to get the port number set correctly. Any help or hints for setting session->local_port would be greatly appreciated :) With kind regards, Teus.
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