Description: Libpcap library using the LAN IP packet capture, asked: Print packet source and destination physical addresses print the source IP address of IP and purpose print out the upper layer protocol type If the upper layer protocol is TCP or UDP protocol, source port printing purposes information If the upper layer protocol is TCP or UDP protocol, the 16 hex and ASCII data to the two ways to print out the same time, non-printable characters with ' .' instead
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sniffer.c
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