sniffer to tcp
2016-08-23
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Sniffer to capture packets tcp udp,
filters are based on a declarative predicate syntax. A filter is an ASCII string containing a filtering expression. pcap_compile() takes the expression and translates it in a program for the kernel-level packet filter.
The expression selects which packets will be dumped. If no expression is given, all packets on the net will be accepted by the kernel-level filtering engine. Otherwise, only packets for which expression is `true' will be accepted.
The expression consists of one or more primitives. Primitives usually consist of an id (name or number) preceded by one or more qualifiers. There are three different kinds of qualifier:
- type
- qualifiers say what kind of thing the id name or number refers to. Possible types are host, net and port. E.g., `host foo', `net 128.
c
tcp
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