[PATCH] SNMPsysdesr.nse Uptime Fix

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Hey everyone,

I turned on SNMP on a newer piece of equipment I have on my LAN so I
could play with it and use the SNMPsysdesr NSE script.

I used the script against it, and it told me the uptime was about 5
days, which is reasonable (I don't remember when it rebooted last).
However, later on, the script then told me the uptime was 130 days, so I
knew something was up. It usually hovered at 5:

161/udp open snmp script-set
| SNMPv1: Prestige 2302R
|_ System uptime: 5 days, 20:0:47.48 (50404748 timeticks)

Watching the exchange with Wireshark, I saw that the bytes holding the
uptime were preceded by a byte which held that length (so the amount of
bytes for the uptime can vary from 2-4 [or I guess technically 1, but
that's really small so I've never seen it]).

So, I've attached a patch which fixes the uptime reporting. It all
works great for me. Wireshark confirms the calculated uptime that the
script now prints and uses (with 2-3 byte uptimes, I haven't waited long
enough for 4 because I've rebooted it several times while testing).

161/udp open snmp script-set
| SNMPv1: Prestige 2302R
|_ System uptime: 0 days, 0:12:25 (74500 timeticks)

If you can test it and verify that this works correctly, I'd appreciate
it. I'll commit it soon if there are no issues.

Thanks,
Kris Katterjohn

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