mirror of
https://gitlab.com/wgp/dougal/software.git
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43 lines
1.5 KiB
Bash
43 lines
1.5 KiB
Bash
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#!/bin/bash
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#
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# Rewrite packet captures in order to be able to replay them.
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#
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# SINET: Rewrite all packets with this source IP address
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# SETHER: Rewrite all packets with this MAC
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#
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# DINET: Rewrite all packets with this destination IP address
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# DETHER: Rewrite all packets with this destination MAC address
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#
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# The resulting files have the original name with "-rewritten.pcap"
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# appended as a suffix. Those packets may then be replayed from a
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# different computer or virtual container, for instance with:
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#
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# sudo bittwist -i 1 -v -m10 capture-rewritten.pcap
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#
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# Where -i n is the interface name (use bittwist -d to list available
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# interfaces), -v is the verbose flag and -m10 replays at 10× speed.
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#
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SINET=${SINET:-$(ip -o -4 addr |grep -v " lo " |head -n 1 |sed -r 's/^.*inet\s([0-9.]+).*$/\1/')}
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SETHER=${SETHER:-$(ip -o link |grep -v " lo" |head -n 1 |sed -r 's/^.*ether\s([0-9a-fA-F:]+).*$/\1/')}
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DINET=${DINET:-$(ip -o -4 addr |grep -v " lo " |head -n 1 |sed -r 's/^.*inet\s([0-9.]+).*$/\1/')}
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DETHER=${DETHER:-$(ip -o link |grep -v " lo" |head -n 1 |sed -r 's/^.*ether\s([0-9a-fA-F:]+).*$/\1/')}
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for f in $*; do
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OUTFNAME=$f-rewritten.pcap
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echo $f → $OUTFNAME
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if [[ -n "$SINET" && -n "$SETHER" ]]; then
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tcprewrite -S 0.0.0.0/0:$SINET --enet-smac=$SETHER \
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-D 0.0.0.0/0:$DINET --enet-dmac=$DETHER \
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--infile "$f" \
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--outfile "$OUTFNAME"
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else
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tcprewrite -D 0.0.0.0/0:$DINET --enet-dmac=$DETHER \
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--infile "$f" \
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--outfile "$OUTFNAME"
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fi
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done
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