fluffy/dumbdecode

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#! /bin/sh
# Emulate dumbdecode.py from python netarch
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# What this script does:
# * pmerge takes multiple pcap files and outputs a single pcap stream,
# with everything in time order
# * pcat outputs a line with six fields for each input packet:
# * timestamp (in seconds, with millisecond precison)
# * protocol (like `UDP` or `TCP`)
# * source address
# * destination address
# * protocol options (like SYN or PSH)
# * payload, hex-encoded
# * For each pcat output line:
# * Convert timestamp to RFC3339 format, so humans can read it
# * Print a bit of header with the protocol, using python netarch formatting
# * Print the source, destination, and formatted time
# * Write out a hex dump of the paylaod
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pmerge "$@" | pcat | while read ts proto src dst opts payload; do
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when=$(TZ=Z date -d @${ts%.*} "+%Y-%m-%d %H:%M:%S") # Format time as human-readable
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printf "Packet %s None: None\n" $proto
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printf " %s -> %s (%s)\n" ${src%,*} ${dst%,*} "$when"
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echo $payload | unhex | hd
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echo
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done