> > > You need to pass a pointer to the actual (binary) value - not a
> > > printable version of it.
>
> > > snmp_add_var(pdu, auth_OID, auth_OID_len, 'i', &value);
>
>
> > Thanks but:
> >
> > x.c:1022: warning: passing arg 5 of `snmp_add_var' from
> > incompatible pointer
> type
> OK - so cast it to the expected type:
>
> snmp_add_var(pdu, auth_OID, auth_OID_len, 'i', (u_char *)&value);
>
>
>
> > value is
> >
> > char value[20]
> >
> > so it already _was_ a pointer.
>
>
> Yes - but a pointer to the wrong value.
> "snmp_add_var" is expecting a pointer to the *binary* value,
> not to a printable representation of it.
>
> For example, if value has the value 255,
> then snmp_add_var would expect a single byte containing 0xff,
> not three bytes containing the ascii characters '2', '5', '5'.
> (Well, actually it'd expect the 4-octet value 0x000000ff,
> but you get the idea).
>
> The Net-SNMP suite invariably handles MIB value parameters as
> u_char*, but this doesn't mean a printable string. It's best
> thought of as a generic pointer - i.e. similar to void*
>
> OK?
Well, no. I really appreciate your quick feedback and explanation but now I'm worse
off than I was. Before, my set routine got called n times for port 1, now it doesn't
get called at all!
Now I've got:
int SetTrapsEnabled(int links[])
{
struct snmp_pdu *pdu;
struct snmp_pdu *response;
size_t port;
int status;
int retval;
pdu = snmp_pdu_create(SNMP_MSG_SET);
for (port = 0; port < NUM_IF; ++port) {
link_OID[link_OID_len-1] = port+1;
snmp_add_var(pdu, link_OID, link_OID_len, 'i',
(u_char*)&(links[port]));
}
status = snmp_synch_response(ss, pdu, &response);
...
And nothing happens!
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