I am having trouble using the Single API to perform asynchronous walks
with Net-SNMP version 5.4.3. Any help would be great. I have two
main issues:
1. Does the Single API really use the same callback function
signature as the Traditional API (snmp_callback at snmp_api.h:180)?
I would expect the second parameter, the session pointer, to be a
(void *) or a (struct session_list *) instead of a (netsnmp_session *)
because the Single API uses opaque session pointers. If the second
parameter of the callback must be a (netsnmp_session *), how can I
make this work?
2. What is the proper way to perform an asynchronous bulk walk to get
all subtree OIDs?
When sending subsequent asynchronous SNMP_MSG_GETBULK APDUs in my
callback function, my program segmentation faults when
_sess_async_send() dereferences its session pointer at
snmp_api.c:4696. The session pointer points to an invalid non-null
address; I think the issue may be related to possible misuse described
in item 1. If I should not make additional asynchronous calls from
the callback function, what is the proper procedure? Here is a
backtrace, and I can provide my code if needed.
#0 0x00007ff1c6ea31c1 in _sess_async_send (sessp=0x13dbc60, pdu=0x1478570,
callback=0x401a9e <response_h>, cb_data=0x7fffbb24ffe0) at snmp_api.c:4696
#1 0x00007ff1c6ea3dc1 in snmp_sess_async_send (sessp=0x13dbc60,
pdu=0x1478570, callback=0x401a9e <response_h>, cb_data=0x7fffbb24ffe0)
at snmp_api.c:4973
#2 0x000000000040210b in response_h (operation=1, sp=0x13dbc60,
reqid=163334208, cb_pdu=0x1477140, cb_data=0x7fffbb24ffe0)
at walktest_async_multireq.c:261
#3 0x00007ff1c6ea49fc in _sess_process_packet (sessp=0x1418c50, sp=0x13dbc60,
isp=0x14631f0, transport=0x1463430, opaque=0x1459a10, olength=20,
packetptr=0x1467130
"0\201\322\002\001\003\060\021\002\004\066\336\207\066\002\003",
length=213) at snmp_api.c:5263
#4 0x00007ff1c6ea6359 in _sess_read (sessp=0x1418c50, fdset=0x7fffbb251050)
at snmp_api.c:5764
#5 0x00007ff1c6ea63a7 in snmp_sess_read (sessp=0x1418c50,
fdset=0x7fffbb251050) at snmp_api.c:5783
#6 0x0000000000401a57 in main (argc=1, argv=0x7fffbb251398)
at walktest_async_multireq.c:148
Thank you for your time.
Brendan
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