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Ringbuf pcap reading and "bogus savefile header" error


From: Tugrul Erdogan <h.tugrul.erdogan () gmail com>
Date: Wed, 7 Dec 2016 09:12:40 +0300

Hi all,

I have a problem about reading circular ringbuf pcap records.

There is a pcap file which stores last X seconds of packets. And with each
X seconds of a period, a new pcap file is created.

I can successfully read the initial pcap file for X seconds with "tail -n+o
-F <filename> | tcpdump -r - -nn". But when the pcap file is rotated, the
new pcap file causes to "bogus savefile header" from libpcap. I think that
the new pcap file's header section is being tried to parse as packet data.

How can I adapt the libpcap for my needs? I kindly want to take your
opinions.

Best regards,
Tugrul,
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