Wireshark-dev: Re: [Wireshark-dev] pcap-ng support
From: Ulf Lamping <[email protected]>
Date: Fri, 18 Jan 2008 08:01:50 +0100
Gianluca Varenni schrieb:
FYI today I tried opening a pcap-ng file with wireshark rev 24118, and it sort of worked.
What works:
- the first file I opened was a 50+MB file generated with NTAR. Real ethernet packets coming from a custom board. Wireshark opened the trace without any problem, and the decoded packets made perfectly sense. YAY!
What doesn't work:
- timestamps are wrong. There are two problems here:
1. the IDB option for the timestamp precision is not decoded, and I was generating timestamps with nanosecond precision.
No wonder, the corresponding line in the code says: /* XXX - convert timestamps into nsecs */ ;-)
2. timestamps are not in the libpcap fashion (seconds and microseconds, or seconds and nanoseconds). It's a single 64bit quantity that is split into high and low 32bits.
The timestamps currently won't work, but shouldn't be too hard to fix.

I'll have a look ...

Regards, ULFL

P.S: The FCS is also not decoded, Wireshark will internally always handle pcapng as: "don't know if FCS is there"