I'm using net-snmp-5.7.2.
And I met an issue when I tried to set IP-MIB::ipv4InterfaceEnableStatus
I got the following error when I set it to 2(stop):
Error in packet.
Reason: wrongLength (The set value has an illegal length from what the agent
expects)
I reviewed the code, and found the it failed at the following code:
rc = netsnmp_check_vb_type_and_size(var, ASN_INTEGER,
sizeof(rowreq_ctx->data.
ipv4InterfaceEnableStatus));
It is in function _ipv4InterfaceTable_check_column() in file
"agent/mibgroup/ip-mib/ipv4InterfaceTable/ipv4InterfaceTable_interface.c"
The rowreq_ctx->data.ipv4InterfaceEnableStatus is refer to admin_status in
struct netsnmp_interface_entry:
typedef struct netsnmp_interface_entry_s {
......
char admin_status;
.......
} netsnmp_interface_entry;
But in ipMIB, it is defined as an INTEGER:
ifAdminStatus OBJECT-TYPE
SYNTAX INTEGER {
up(1), -- ready to pass packets
down(2),
testing(3) -- in some test mode
}
I also found _ifTable_check_column() in file
"agent/mibgroup/if-mib/ifTable/ifTable_interface.c" has another different
method to handle it:
case COLUMN_IFADMINSTATUS:
/** special case: we are using exernal storage w/smaller data size
** for storage, so we can't use sizeof on data context. So we
** just check that it's the expected size. The enum tests below
** will ensure that there is no data overflow. */
rc = netsnmp_check_vb_type_and_size(var, ASN_INTEGER,
sizeof(u_long))
So I think the admin_status in netsnmp_interface_entry should be defined u_int
to avoid the column check problem.
Thanks,
Peilong
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