RE: When there is "no instance" object in a table,

#1 (**permalink**) 09-06-2007

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Thanks for the patch information, it seems that patch is already added =
in 5.3.1, but the problem still exists.=20

=20

The following is the "snmpgetnext 10.1 nlmLogEngineID.0.1" GDB back =
trace:

=20

Breakpoint 2, table_helper_handler (handler=3D0x10063978, =
reginfo=3D0x100633d8,

reqinfo=3D0x100dd5f8, requests=3D0x1012ce88) at table.c:154

warning: Source file is more recent than executable.

154 int incomplete, out_of_range, cleaned_up =3D 0;

(gdb) p *reginfo

$1 =3D {handlerName =3D 0x10063410 "nlmLogTable", contextName =3D 0x0, =
rootoid =3D 0x10063420,

rootoid_len =3D 10, handler =3D 0x100639a8, modes =3D 3, priority =3D =
127, range_subid =3D 0,

range_ubound =3D 0, timeout =3D 0, global_cacheid =3D 0, my_reg_void =
=3D 0x0}

(gdb) bt

#0 table_helper_handler (handler=3D0x10063978, reginfo=3D0x100633d8, =
reqinfo=3D0x100dd5f8,

requests=3D0x1012ce88) at table.c:154

#1 0x0fe648c8 in netsnmp_call_handler (next_handler=3D0x10063978, =
reginfo=3D0x100633d8,

reqinfo=3D0x100dd5f8, requests=3D0x1012ce88) at agent_handler.c:434

#2 0x0fe64c6c in netsnmp_call_handlers (reginfo=3D0x100633d8, =
reqinfo=3D0x100dd5f8,

requests=3D0x1012ce88) at agent_handler.c:515

#3 0x0fe56918 in handle_var_requests (asp=3D0x1012bc50) at =
snmp_agent.c:2485

#4 0x0fe58090 in handle_pdu (asp=3D0x1012bc50) at snmp_agent.c:3262

#5 0x0fe57be8 in netsnmp_handle_request (asp=3D0x1012bc50, status=3D0) =
at snmp_agent.c:3058

#6 0x0fe54ea8 in handle_snmp_packet (op=3D1, session=3D0x100fa508, =
reqid=3D1940079301,

pdu=3D0x100fdee8, magic=3D0x0) at snmp_agent.c:1833

#7 0x0fd60ee4 in _sess_process_packet (sessp=3D0x100df158, =
sp=3D0x100fa508,

isp=3D0x10120448, transport=3D0x100f4570, opaque=3D0x100edce8, =
olength=3D16,

packetptr=3D0x10144128 =
"0/\002\001\001\004\aprivate=A1!\002\004s=A3B=C5\002\ 001", length=3D49)

at snmp_api.c:5340

#8 0x0fd62294 in _sess_read (sessp=3D0x100df158, fdset=3D0x7f9a98b0) at =
snmp_api.c:5753

#9 0x0fd6232c in snmp_sess_read (sessp=3D0x100df158, =
fdset=3D0x7f9a98b0) at snmp_api.c:5772

#10 0x0fd61088 in snmp_read (fdset=3D0x7f9a98b0) at snmp_api.c:5392

#11 0x100048e4 in receive () at snmpd.c:1167

#12 0x1000420c in main (argc=3D6, argv=3D0x7f9a9db4) at snmpd.c:1011

(gdb) c

=20

Breakpoint 2, table_helper_handler (handler=3D0x100628d0, =
reginfo=3D0x100620e8,

reqinfo=3D0x100dd5f8, requests=3D0x1012ce88) at table.c:154

154 int incomplete, out_of_range, cleaned_up =3D 0;

(gdb) p *reginfo

$2 =3D {handlerName =3D 0x10062120 "nlmLogVariableTable", contextName =
=3D 0x0,

rootoid =3D 0x10062138, rootoid_len =3D 10, handler =3D 0x10062900, =
modes =3D 3,

priority =3D 127, range_subid =3D 0, range_ubound =3D 0, timeout =3D =
0, global_cacheid =3D 0,

my_reg_void =3D 0x0}

(gdb) bt

#0 table_helper_handler (handler=3D0x100628d0, reginfo=3D0x100620e8, =
reqinfo=3D0x100dd5f8,

requests=3D0x1012ce88) at table.c:154

#1 0x0fe648c8 in netsnmp_call_handler (next_handler=3D0x100628d0, =
reginfo=3D0x100620e8,

reqinfo=3D0x100dd5f8, requests=3D0x1012ce88) at agent_handler.c:434

#2 0x0fe64c6c in netsnmp_call_handlers (reginfo=3D0x100620e8, =
reqinfo=3D0x100dd5f8,

requests=3D0x1012ce88) at agent_handler.c:515

#3 0x0fe56918 in handle_var_requests (asp=3D0x1012bc50) at =
snmp_agent.c:2485

#4 0x0fe57628 in handle_getnext_loop (asp=3D0x1012bc50) at =
snmp_agent.c:2906

#5 0x0fe580d0 in handle_pdu (asp=3D0x1012bc50) at snmp_agent.c:3275

#6 0x0fe57be8 in netsnmp_handle_request (asp=3D0x1012bc50, status=3D0) =
at snmp_agent.c:3058

#7 0x0fe54ea8 in handle_snmp_packet (op=3D1, session=3D0x100fa508, =
reqid=3D1940079301,

pdu=3D0x100fdee8, magic=3D0x0) at snmp_agent.c:1833

#8 0x0fd60ee4 in _sess_process_packet (sessp=3D0x100df158, =
sp=3D0x100fa508,

isp=3D0x10120448, transport=3D0x100f4570, opaque=3D0x100edce8, =
olength=3D16,

packetptr=3D0x10144128 =
"0/\002\001\001\004\aprivate=A1!\002\004s=A3B=C5\002\ 001", length=3D49)

at snmp_api.c:5340

#9 0x0fd62294 in _sess_read (sessp=3D0x100df158, fdset=3D0x7f9a98b0) at =
snmp_api.c:5753

#10 0x0fd6232c in snmp_sess_read (sessp=3D0x100df158, =
fdset=3D0x7f9a98b0) at snmp_api.c:5772

#11 0x0fd61088 in snmp_read (fdset=3D0x7f9a98b0) at snmp_api.c:5392

#12 0x100048e4 in receive () at snmpd.c:1167

#13 0x1000420c in main (argc=3D6, argv=3D0x7f9a9db4) at snmpd.c:1011

(gdb)

=20

Thanks

Emi

________________________________

From: Jayaprakasha Guddenahalli Naganna [mailto:jnaganna@nexthop.com]=20
Sent: Thursday, September 06, 2007 2:19 AM
To: Emi Yanagi; net-snmp-coders@lists.sourceforge.net
Subject: RE: When there is "no instance" object in a table,snmpgetnext =
skip the rest of the objects in the table and search forthe next table

=20

Problem is in "sparse_table_helper_handler" function,=20

- if (request->requestvb->type =3D=3D ASN_NULL ||

- request->requestvb->type =3D=3D SNMP_NOSUCHINSTANCE) {

+ if (request->requestvb->type =3D=3D SNMP_NOSUCHINSTANCE) {

=20

When ' request->requestvb->type' is ASN_NULL this function is not =
assigning ASN_PRIV_RETRY and get next will move to next table instead of =
moving to next accessible column/instance.

Please refer to the attached mail thread...

Thanks

-JP

=20

________________________________

From: net-snmp-coders-bounces@lists.sourceforge.net =
[mailto:net-snmp-coders-bounces@lists.sourceforge.net] On Behalf Of Emi =
Yanagi
Sent: Wednesday, September 05, 2007 9:21 PM
To: net-snmp-coders@lists.sourceforge.net
Subject: When there is "no instance" object in a table,snmpgetnext skip =
the rest of the objects in the table and search forthe next table

=20

I am reporting a bug in snmpgetnext. Here is how to reproduce the =
problem with nlmLogTable.

=20

NlmLogEntry ::=3D SEQUENCE {

nlmLogIndex Unsigned32,

nlmLogTime TimeStamp,

nlmLogDateAndTime DateAndTime,

nlmLogEngineID SnmpEngineID,

nlmLogEngineTAddress TAddress,

nlmLogEngineTDomain TDomain,

nlmLogContextEngineID SnmpEngineID,

nlmLogContextName SnmpAdminString,

nlmLogNotificationID OBJECT IDENTIFIER

}

=20

$ snmpget 10.1 nlmLogTime.0.3

NOTIFICATION-LOG-MIB::nlmLogTime."".3 =3D Timeticks: (15125) 0:02:31.25

$ snmpgetnext 10.1 nlmLogTime.0.3

NOTIFICATION-LOG-MIB::nlmLogDateAndTime."".3 =3D STRING: =
2007-9-5,15:9:29.0,+0:0

$ snmpgetnext 10.1 nlmLogDateAndTime.0.3

NOTIFICATION-LOG-MIB::nlmLogEngineID."".3 =3D ""

$ snmpget 10.1 nlmLogEngineTAddress.0.3

NOTIFICATION-LOG-MIB::nlmLogEngineTAddress."".3 =3D No Such Instance =
currently exists at this OID

$ snmpget 10.1 nlmLogNotificationID.0.3

NOTIFICATION-LOG-MIB::nlmLogNotificationID."".3 =3D OID: =
IF-MIB::linkDown

=20

Now since nlmLogEngineTAddress has no instance, although the last object =
nlmLogNotificationID in nlmLogTable exists, snmpgetnext of =
nlmLogEngineID will return nlmLogVariableID of the next table =
nlmLogVariableTable instead of nlmLogNotificationID in the current table =
nlmLogTable.

=20

$ snmpgetnext 10.1 nlmLogEngineID.0.3

NOTIFICATION-LOG-MIB::nlmLogVariableID."".3.1 =3D OID: =
SNMPv2-MIB::sysUpTime.0

=20

Any idea how to improve snmpgetnext in this case?

Emi Yanagi

=20

=20

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<div class=3DSection1>

Thanks for the patch information, =
it seems
that patch is already added in 5.3.1, but the problem still exists. =
<o:p></o:p>

<o:p> </o:p>

The following is the "snmpgetnext 10.1
nlmLogEngineID.0.1" GDB back trace:<o:p></o:p>

<o:p> </o:p>

Breakpoint 2,
table_helper_handler (handler=3D0x10063978, =
reginfo=3D0x100633d8,<o:p></o:p>

=A0=A0=A0 =
reqinfo=3D0x100dd5f8,
requests=3D0x1012ce88) at table.c:154<o:p></o:p>

warning: Source =
file is
more recent than executable.<o:p></o:p>

154=A0=A0=A0=A0=A0=
=A0=A0=A0
int=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 incomplete, out_of_range, =
cleaned_up =3D 0;<o:p></o:p>

(gdb) p =
*reginfo<o:p></o:p>

$1 =3D =
{handlerName =3D
0x10063410 "nlmLogTable", contextName =3D 0x0, rootoid =3D =
0x10063420,<o:p></o:p>

=A0 rootoid_len =
=3D 10,
handler =3D 0x100639a8, modes =3D 3, priority =3D 127, range_subid =3D =
0,<o:p></o:p>

=A0 range_ubound =
=3D 0,
timeout =3D 0, global_cacheid =3D 0, my_reg_void =3D =
0x0}<o:p></o:p>

(gdb) =
bt<o:p></o:p>

#0=A0 =
table_helper_handler
(handler=3D0x10063978, reginfo=3D0x100633d8, =
reqinfo=3D0x100dd5f8,<o:p></o:p>

=A0=A0=A0 =
requests=3D0x1012ce88)
at table.c:154<o:p></o:p>

#1=A0 0x0fe648c8 =
in
netsnmp_call_handler (next_handler=3D0x10063978, =
reginfo=3D0x100633d8,<o:p></o:p>

=A0=A0=A0 =
reqinfo=3D0x100dd5f8,
requests=3D0x1012ce88) at =
agent_handler.c:434<o:p></o:p>

#2=A0 0x0fe64c6c =
in
netsnmp_call_handlers (reginfo=3D0x100633d8, =
reqinfo=3D0x100dd5f8,<o:p></o:p>

=A0=A0=A0 =
requests=3D0x1012ce88)
at agent_handler.c:515<o:p></o:p>

#3=A0 0x0fe56918 =
in
handle_var_requests (asp=3D0x1012bc50) at =
snmp_agent.c:2485<o:p></o:p>

#4=A0 0x0fe58090 =
in
handle_pdu (asp=3D0x1012bc50) at =
snmp_agent.c:3262<o:p></o:p>

#5=A0 0x0fe57be8 =
in
netsnmp_handle_request (asp=3D0x1012bc50, status=3D0) at =
snmp_agent.c:3058<o:p></o:p>

#6=A0 0x0fe54ea8 =
in
handle_snmp_packet (op=3D1, session=3D0x100fa508, =
reqid=3D1940079301,<o:p></o:p>

=A0=A0=A0 =
pdu=3D0x100fdee8,
magic=3D0x0) at snmp_agent.c:1833<o:p></o:p>

#7=A0 0x0fd60ee4 =
in
_sess_process_packet (sessp=3D0x100df158, =
sp=3D0x100fa508,<o:p></o:p>

=A0=A0=A0 =
isp=3D0x10120448,
transport=3D0x100f4570, opaque=3D0x100edce8, =
olength=3D16,<o:p></o:p>

=A0=A0=A0 =
packetptr=3D0x10144128
"0/\002\001\001\004\aprivate=A1!\002\004s=A3B=C5\002\ 001", =
length=3D49)<o:p></o:p>

=A0=A0=A0 at =
snmp_api.c:5340<o:p></o:p>

#8=A0 0x0fd62294 =
in
_sess_read (sessp=3D0x100df158, fdset=3D0x7f9a98b0) at =
snmp_api.c:5753<o:p></o:p>

#9=A0 0x0fd6232c =
in
snmp_sess_read (sessp=3D0x100df158, fdset=3D0x7f9a98b0) at =
snmp_api.c:5772<o:p></o:p>

#10 0x0fd61088 =
in
snmp_read (fdset=3D0x7f9a98b0) at =
snmp_api.c:5392<o:p></o:p>

#11 0x100048e4 =
in receive
() at snmpd.c:1167<o:p></o:p>

#12 0x1000420c =
in main
(argc=3D6, argv=3D0x7f9a9db4) at =
snmpd.c:1011<o:p></o:p>

(gdb) =
c<o:p></o:p>

<o:p> </o:p>=


Breakpoint 2,
table_helper_handler (handler=3D0x100628d0, =
reginfo=3D0x100620e8,<o:p></o:p>

=A0=A0=A0 =
reqinfo=3D0x100dd5f8,
requests=3D0x1012ce88) at table.c:154<o:p></o:p>

154=A0=A0=A0=A0=A0=
=A0=A0=A0
int=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 incomplete, out_of_range, =
cleaned_up =3D 0;<o:p></o:p>

(gdb) p =
*reginfo<o:p></o:p>

$2 =3D =
{handlerName =3D
0x10062120 "nlmLogVariableTable", contextName =3D =
0x0,<o:p></o:p>

=A0 rootoid =3D =
0x10062138,
rootoid_len =3D 10, handler =3D 0x10062900, modes =3D =
3,<o:p></o:p>

=A0 priority =3D =
127, range_subid
=3D 0, range_ubound =3D 0, timeout =3D 0, global_cacheid =3D =
0,<o:p></o:p>

=A0 my_reg_void =
=3D 0x0}<o:p></o:p>

(gdb) =
bt<o:p></o:p>

#0=A0 =
table_helper_handler
(handler=3D0x100628d0, reginfo=3D0x100620e8, =
reqinfo=3D0x100dd5f8,<o:p></o:p>

=A0=A0=A0 =
requests=3D0x1012ce88)
at table.c:154<o:p></o:p>

#1=A0 0x0fe648c8 =
in
netsnmp_call_handler (next_handler=3D0x100628d0, =
reginfo=3D0x100620e8,<o:p></o:p>

=A0=A0=A0 =
reqinfo=3D0x100dd5f8,
requests=3D0x1012ce88) at =
agent_handler.c:434<o:p></o:p>

#2=A0 0x0fe64c6c =
in
netsnmp_call_handlers (reginfo=3D0x100620e8, =
reqinfo=3D0x100dd5f8,<o:p></o:p>

=A0=A0=A0 =
requests=3D0x1012ce88)
at agent_handler.c:515<o:p></o:p>

#3=A0 0x0fe56918 =
in
handle_var_requests (asp=3D0x1012bc50) at =
snmp_agent.c:2485<o:p></o:p>

#4=A0 0x0fe57628 =
in
handle_getnext_loop (asp=3D0x1012bc50) at =
snmp_agent.c:2906<o:p></o:p>

#5=A0 0x0fe580d0 =
in
handle_pdu (asp=3D0x1012bc50) at =
snmp_agent.c:3275<o:p></o:p>

#6=A0 0x0fe57be8 =
in
netsnmp_handle_request (asp=3D0x1012bc50, status=3D0) at =
snmp_agent.c:3058<o:p></o:p>

#7=A0 0x0fe54ea8 =
in
handle_snmp_packet (op=3D1, session=3D0x100fa508, =
reqid=3D1940079301,<o:p></o:p>

=A0=A0=A0 =
pdu=3D0x100fdee8,
magic=3D0x0) at snmp_agent.c:1833<o:p></o:p>

#8=A0 0x0fd60ee4 =
in
_sess_process_packet (sessp=3D0x100df158, =
sp=3D0x100fa508,<o:p></o:p>

=A0=A0=A0 =
isp=3D0x10120448,
transport=3D0x100f4570, opaque=3D0x100edce8, =
olength=3D16,<o:p></o:p>

=A0=A0=A0 =
packetptr=3D0x10144128
"0/\002\001\001\004\aprivate=A1!\002\004s=A3B=C5\002\ 001", =
length=3D49)<o:p></o:p>

=A0=A0=A0 at =
snmp_api.c:5340<o:p></o:p>

#9=A0 0x0fd62294 =
in
_sess_read (sessp=3D0x100df158, fdset=3D0x7f9a98b0) at =
snmp_api.c:5753<o:p></o:p>

#10 0x0fd6232c =
in
snmp_sess_read (sessp=3D0x100df158, fdset=3D0x7f9a98b0) at =
snmp_api.c:5772<o:p></o:p>

#11 0x0fd61088 =
in
snmp_read (fdset=3D0x7f9a98b0) at =
snmp_api.c:5392<o:p></o:p>

#12 0x100048e4 =
in receive
() at snmpd.c:1167<o:p></o:p>

#13 0x1000420c =
in main
(argc=3D6, argv=3D0x7f9a9db4) at =
snmpd.c:1011<o:p></o:p>

(gdb)<o:p></o:p><=
/span>

<o:p> </o:p>

Thanks<o:p></o:p>

Emi<o:p></o:p>

<div>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'>

<hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1>

</div>

From: =
Jayaprakasha
Guddenahalli Naganna [mailto:jnaganna@nexthop.com] 
Sent: Thursday, September =
06, 2007
2:19 AM 
To: Emi Yanagi; =
net-snmp-coders@lists.sourceforge.net 
Subject: RE: When there =
is
"no instance" object in a table,snmpgetnext skip the rest of =
the
objects in the table and search forthe next =
table<o:p></o:p>

</div>

<o:p> </o:p>

Problem is in
"sparse_table_helper_handler" function, =
<o:p></o:p>

-        &n bsp;  =

if (request->requestvb->type =3D=3D ASN_NULL =
||<o:p></o:p>

-        &n bsp;  =
    
request->requestvb->type =3D=3D SNMP_NOSUCHINSTANCE) =
{<o:p></o:p>

+       & nbsp;   =

if (request->requestvb->type =3D=3D SNMP_NOSUCHINSTANCE) =
{<o:p></o:p>

<o:p> </o:p>

When ' =
request->requestvb->type'
is ASN_NULL this function is not assigning ASN_PRIV_RETRY and get next =
will
move to next table instead of moving to next accessible =
column/instance.<o:p></o:p>

Please refer to the =
attached
mail thread…<o:p></o:p>

Thanks<o:p></o:p>

-JP<o:p></o:p>

<o:p> </o:p>

<div>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'>

<hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1>

</div>

From: =
net-snmp-coders-bounces@lists.sourceforge.net
[mailto:net-snmp-coders-bounces@lists.sourceforge.net] On Behalf Of Emi Yanagi 
Sent: Wednesday, =
September 05,
2007 9:21 PM 
To:
net-snmp-coders@lists.sourceforge.net 
Subject: When there is =
"no
instance" object in a table,snmpgetnext skip the rest of the =
objects in
the table and search forthe next table<o:p></o:p>

</div>

<o:p> </o:p>

I am reporting a bug in snmpgetnext. Here is how to
reproduce the problem with nlmLogTable.<o:p></o:p>

<o:p> </o:p>

NlmLogEntry ::=3D SEQUENCE =
{<o:p></o:p>

   
nlmLogIndex      &nb sp;   &n=
bsp;    
Unsigned32,<o:p></o:p>

   
nlmLogTime      &nbs p;   &nb=
sp;     
TimeStamp,<o:p></o:p>

   
nlmLogDateAndTime     &nb sp;   
DateAndTime,<o:p></o:p>

   
nlmLogEngineID          &nbsp=
;  
SnmpEngineID,<o:p></o:p>

   
nlmLogEngineTAddress        =
TAddress,<o:p></o:p>

   
nlmLogEngineTDomain     & nbsp;  =
TDomain,<o:p></o:p>

   
nlmLogContextEngineID    &nbsp ; =
SnmpEngineID,<o:p></o:p>

   
nlmLogContextName     &nb sp;   
SnmpAdminString,<o:p></o:p>

   
nlmLogNotificationID        OBJECT =
IDENTIFIER<o:p></o:p>

}<o:p></o:p>

<o:p> </o:p>

$ snmpget 10.1 =
nlmLogTime.0.3<o:p></o:p>

NOTIFICATION-LOG-MIB::nlmLogTime."".3 =3D =
Timeticks:
(15125) 0:02:31.25<o:p></o:p>

$ snmpgetnext 10.1 =
nlmLogTime.0.3<o:p></o:p>

NOTIFICATION-LOG-MIB::nlmLogDateAndTime."".3=
=3D
STRING: 2007-9-5,15:9:29.0,+0:0<o:p></o:p>

$ snmpgetnext 10.1 =
nlmLogDateAndTime.0.3<o:p></o:p>

NOTIFICATION-LOG-MIB::nlmLogEngineID."".3 =
=3D
""<o:p></o:p>

$ snmpget 10.1 =
nlmLogEngineTAddress.0.3<o:p></o:p>

NOTIFICATION-LOG-MIB::nlmLogEngineTAddress."&quot=
;.3 =3D
No Such Instance currently exists at this =
OID<o:p></o:p>

$ snmpget 10.1 =
nlmLogNotificationID.0.3<o:p></o:p>

NOTIFICATION-LOG-MIB::nlmLogNotificationID."&quot=
;.3 =3D
OID: IF-MIB::linkDown<o:p></o:p>

<o:p> </o:p>

Now since nlmLogEngineTAddress has no instance, =
although the
last object nlmLogNotificationID in nlmLogTable exists, snmpgetnext of
nlmLogEngineID will return nlmLogVariableID of the next table
nlmLogVariableTable instead of nlmLogNotificationID in the current table
nlmLogTable.<o:p></o:p>

<o:p> </o:p>

$ snmpgetnext 10.1 =
nlmLogEngineID.0.3<o:p></o:p>

NOTIFICATION-LOG-MIB::nlmLogVariableID."".3.=
1 =3D
OID: SNMPv2-MIB::sysUpTime.0<o:p></o:p>

<o:p> </o:p>

Any idea how to improve snmpgetnext in this =
case?<o:p></o:p>

Emi Yanagi<o:p></o:p>

<o:p> </o:p>

<o:p> </o:p>

</div>

</body>

</html>

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