Wondering if anyone has faced a similar problem and/or
knows the reason:
I've implemented code to integrate a custom MIB with the
SNMP agent, and everything in general works fine. The code
reads/writes objects from/to an external database.
All SNMP commands generally work correctly.
The problem arises when one of two specific objects are
included and I try to do a snmpwalk on the MIB. snmpwalk
works correctly the first time. However, attempting to do
a snmpwalk a second time invariably causes the agent to
crash.
Would very much appreciate any opinions/suggestions on
this.
I am appending relevant sections of code/MIB below.
Thanks in advance,
Ayan
1. MIB file header:
IPCompanion-MIB DEFINITIONS ::= BEGIN
IMPORTS
mgmt, internet
FROM RFC1155-SMI
OBJECT-TYPE
FROM RFC-1212;
-- This MIB module uses the extended
OBJECT-TYPE macro as
-- defined in [14];
-- MIB-II (same prefix as MIB-I)
mib-2 OBJECT IDENTIFIER ::= { mgmt 1 }
-- textual conventions
DisplayString ::=
OCTET STRING
-- This data type is used to model textual
information taken
-- from the NVT ASCII character set. By
convention, objects
-- with this syntax are declared as having
--
-- SIZE (0..255)
-- PhysAddress ::=
-- OCTET STRING
-- This data type is used to model media
addresses. For many
-- types of media, this will be in a binary
representation.
-- For example, an ethernet address would be
represented as
-- a string of 6 octets.
-- groups in MIB-II
system OBJECT IDENTIFIER
--DEFAULT test-function-async
null_test_async
::= { mib-2 1 }
-- the System group
-- Implementation of the System group is
mandatory for all
-- systems. If an agent is not configured to
have a value
-- for any of these variables, a string of
length 0 is
-- returned.
interfaces OBJECT IDENTIFIER ::= { mib-2 2 }
at OBJECT IDENTIFIER ::= { mib-2 3 }
ip OBJECT IDENTIFIER ::= { mib-2 4 }
icmp OBJECT IDENTIFIER ::= { mib-2 5 }
tcp OBJECT IDENTIFIER ::= { mib-2 6 }
udp OBJECT IDENTIFIER ::= { mib-2 7 }
egp OBJECT IDENTIFIER ::= { mib-2 8 }
-- historical (some say hysterical)
-- cmot OBJECT IDENTIFIER ::= { mib-2 9 }
transmission OBJECT IDENTIFIER ::= { mib-2 10 }
snmp OBJECT IDENTIFIER ::= { mib-2 11 }
experimental OBJECT IDENTIFIER ::= { internet 3
}
private OBJECT IDENTIFIER ::= { internet 4
}
enterprises OBJECT IDENTIFIER ::= { private 1
}
viacast OBJECT IDENTIFIER
--DEFAULT test-function-async
null_test_async
::= { enterprises 5014 }
viacastLband OBJECT IDENTIFIER ::= { viacast 1
}
viacastTsd OBJECT IDENTIFIER ::= { viacast 2
}
viacastStats OBJECT IDENTIFIER ::= { viacast 3
}
viacastLan OBJECT IDENTIFIER ::= { viacast 4
}
viacastMisc OBJECT IDENTIFIER ::= { viacast 5
}
viacastUnit OBJECT IDENTIFIER ::= { viacast 6
}
viacastLicn OBJECT IDENTIFIER ::= { viacast 7
}
-- the viacast group
2. Offending MIB object:
pmibLbandDVBSPilot OBJECT-TYPE
SYNTAX DisplayString
ACCESS read-write
STATUS mandatory
DESCRIPTION "Enable DVBS Pilot"
::= { viacastLband 7 }
3. Handler code for the object:
void
init_viacastLband(void)
{
/***other init code***/
netsnmp_register_scalar(netsnmp_create_handler_registration
("pmibLbandDVBSPilot",
handle_pmibLbandDVBSPilot,
pmibLbandDVBSPilot_oid,
OID_LENGTH(pmibLbandDVBSPilot_oid),
HANDLER_CAN_RWRITE));
}
int
handle_pmibLbandDVBSPilot(netsnmp_mib_handler *handler,
netsnmp_handler_registration
*reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests)
{
int ret;
static char szbuf_tmp_decode[128];
int nbytes_decoded;
static char szbuf_tmp[128];
char mybuf[SPRINT_MAX_LEN];
switch (reqinfo->mode) {
case MODE_GET:
dboper_decode( szbuf_tmp_decode, sizeof(
szbuf_tmp_decode ),
&nbytes_decoded,
DBPARAM_LBAND_DVBS2_PILOT,
&gst_db_engine, 0 );
snmp_set_var_typed_value(requests->requestvb,
ASN_OCTET_STR,
(u_char
*)szbuf_tmp_decode,
nbytes_decoded);
break;
case MODE_SET_RESERVE1:
ret = netsnmp_check_vb_type(requests->requestvb,
ASN_OCTET_STR);
if (ret != SNMP_ERR_NOERROR)
netsnmp_set_request_error(reqinfo, requests,
ret);
break;
case MODE_SET_RESERVE2:
break;
case MODE_SET_FREE:
break;
case MODE_SET_ACTION:
strncpy(mybuf, requests->requestvb->val.string,
requests->requestvb->val_len);
mybuf[SNMP_MIN(requests->requestvb->val_len,
SPRINT_MAX_LEN-1)] = '\0';
snmp_log(LOG_INFO, "pmibLbandDVBSPilot:
string_value: %s\n", mybuf);
ret = dboper_proc_usr_input( szbuf_tmp,
sizeof(szbuf_tmp),
DBPARAM_LBAND_DVBS2_PILOT,
&gst_db_engine, 0,
mybuf );
save_params(&gst_db_engine);
if ( ret < 0 )
netsnmp_set_request_error(reqinfo, requests,
SNMP_ERR_WRONGVALUE);
break;
case MODE_SET_COMMIT:
break;
case MODE_SET_UNDO:
break;
default:
snmp_log(LOG_ERR, "unknown mode (%d) in
handle_pmibLbandDVBSPilot\n", reqinfo->mode);
return SNMP_ERR_GENERR;
}
return SNMP_ERR_NOERROR;
}
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