Dear sir:
I am redeveloping a SNMP agent using net-snmp 5.2.3 package under
linux.After nearly 2 moth's using ,I've met several problems i can't resolve
which will be listed below.I will really appreciate your help.
1.About scalar variable's handler function
I have a scalar variable in my mib.When it is being GET,it will return
the source ip of this GET request(the soruce ip of the UDP packet).Then, I use
the parameters "requests->agent_req_info->asp->session->peername" or
"reqinfo->asp->session->peername" of the handler function:
handle_peername(netsnmp_mib_handler *handler,
netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests)
to get it,but failed.It just returns null string.It seems like that these
parameters did not get the value I want and just had their system-initial
values.
So,how can i get the ip of the requesting pc?
2.About SNMPV2 trap
My old agent was developed under vxwoks.It send trap2 messages,but don't
contain the varbind: sysTimeUp.0 and sysTrapOid.0. So the manager parse trap2
pdu in this simpler format.It can't parse standard trap2 pdu sent by net-snmp
API.Can net-snmp send or parse trap2 messages in this simpler format?
3.About general net-snmp apps' executing
I've downloaded all the source files of NET-SNMP-TUTORAIL 5,including the
makefile.When making,it succeed.But when executing,1 error occurs:"error while
loading shared libraries: libnetsnmp.so.9: cannot open shared object file: No
such file or directory".However,the file libnetsnmp.so.9 does exist in the
directroy /usr/local/lib.WHY?
4.About table variable's implement
I use the module mib2c.iterate.conf to build C files for the table
variable, and modify the codes according to agent/mibgroup/mibII/udptable.c.
When using a linked list to store table datas,it is all right.But when using a
array to store these datas,it will automatically add an empty row to the
beginning when requested.If using snmptable to get the table datas,i will see
an empty row with system-initialized values,then there are my correct
datas,while the array datas is correct.WHY?
These questions really have puzzled me for a long time.Thank you very much
for your help or other useful suggestions!
Best reagards,
zhou
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