Hello,
For a school project I am currently delving deep into the
tcpdump (and
libpcap) source code. The goal is to create a program that
uses the
same expression language as tcpdump but using a different
backend.
I have examined the scanner.l and grammer.y files. The
grammer rules
are clear, but I do not quite understand the abstract syntax
tree that
is built in the actions of the grammar rules.
Could someone explain (or point me in the right direction
on) how
those blocks contain the information that is supplied in
the
command-line expression?
Especially the backpatching and merging of the
block-structures and
thus forming 'and' or 'or' conditions seems like black magic
so far.
Can anyone enlighten me please?
Any help is greatly appreciated!
With kind regards,
--
Auke Folkerts
Computer Science Student
Vrije Universiteit Amsterdam
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