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In the first part of the libpcap series a rudimentry packet reader (or sniffer) was built which could read and print tcp/ip traffic on a particular interface. In the second text a look at some simple checks of the data itself, adding options like interface selection, libpcap filter options and verbosity levels. Some of the checks included are:
IP Packet Truncation
IP Header Length
Ethernet Header Length
The filter options are eventually passed exactly like tcpdump using the tcpdumpargv vector copy.
In the first part of the
libpcap series a rudimentry packet reader (or sniffer) was
built which could read and print tcp/ip traffic on a particular interface.
In the second text a look at some simple checks of the data itself, adding
options like interface selection, libpcap filter options
and verbosity levels. Some of the checks included are:
IP Packet Truncation
IP Header Length
Ethernet Header Length
The filter options are eventually passed exactly like tcpdump
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