On systems with 32 bit time_t the engineID produced in setup_engineID
(snmpv3.c) with ENGINEID_TYPE_NETSNMP_RND is 13 bytes long.
Systems with a time_t, that is 64 bits wide, will produce an engineID with a
length of 17 bytes. The additional 4 bytes are all 0 and will be for approx.
the next 90 years, if I understand what the code does.
If this is the intent, please let me know and forget about the rest of the mail.
I came across this because I took a look at the snmp traffic with Wireshark
(1.6.7), which had the following to say about such an 17 byte long engineID:
Engine ID Format: Reserved/Enterprise-specific (128): Net-SNMP Random
<Data not conforming to RFC3411>
So at least the protocol analyser in Wireshark doesn't think it should be that
way..
As far as I know, time_t is 64 bits wide on Windows with newer runtime libs
than vc98 :-) and 64 bit *ix systems, at least on 64 bit Linux. If it was not
the intent to pad the engineID with 4 more bytes on such platforms, I would
suggest the following change in setup_engineID:
Replace
tmptime = time(NULL);
memcpy(bufp + 5 + sizeof(tmpint), &tmptime, sizeof(tmptime));
with
tmptime = time(NULL);
tmpint = (int) tmptime; /* wraps around approx. every 135 years,
even on systems with sizeof(time_t)>4 */
memcpy(bufp + 5 + sizeof(tmpint), & tmpint, sizeof(tmpint));
But that is just a suggestion.
I checked the source code of net_snmp 5.4.4 and 5.7.2, the above lines are in
both.
Have a nice day!
Walter
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