In order to learn how to use NetSNMP I was reading through the MFD ifTable
tutorial. Part of the code generated for the "ifTable" table (when using the
"mib2c" command with the MFD configuration file) is the following:
if ((rowreq_ctx->data.ifDescr == NULL) ||
(rowreq_ctx->data.ifDescr_len < (ifDescr_len * sizeof(ifDescr[0])))) {
snmp_log(LOG_ERR, "not enough space for value\n");
return MFD_ERROR;
}
rowreq_ctx->data.ifDescr_len = ifDescr_len * sizeof(ifDescr[0]);
memcpy(rowreq_ctx->data.ifDescr, ifDescr, ifDescr_len * sizeof(ifDescr[0]));
When runnnig this code I get the "not enough space for value" error being
produced. The reason why it fails is due to the length check which is being
performed (shown below):
(rowreq_ctx->data.ifDescr_len < (ifDescr_len * sizeof(ifDescr[0])))
It seems to me that this will always fail since the
"rowreq_ctx->data.ifDescr_len" variable does not get populated until "after"
the "If" check is performed (see code snipet above).
Question:
What am I missing? How can this check (which is generated for me automatically
using mib2c) actually ever work?
PS: Keep in mind that before the code supplied above, I am populating the
"ifDescr_len" variable with a valid length value.
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