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Made some changes for better use in a shared environment #2

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Made some changes for better use in a shared environment #2

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18 changes: 12 additions & 6 deletions percent-retransmissions.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -75,30 +75,33 @@ echo percent-retransmissions.sh "$FILE"
# Find all data segments and display the TCP Stream, source IP, source port,
# TTL, destination IP and destination port and retransmission flag
# -- NOTE -- that this will not find SYN or FIN segments without data
# sort and then count them and write the results to a temporary file -1
# sort and then count them and write the results to a temporary file -1 (and
# change permissions to 666)

tshark -r $FILE -Y "tcp.len > 0" -T fields -e tcp.stream \
-e ip.src -e tcp.srcport -e ip.ttl -e ip.dst -e tcp.dstport \
-e tcp.analysis.retransmission | sort | uniq -c \
> /tmp/percent-retransmissions-1
> /tmp/percent-retransmissions-1 ; chmod 666 /tmp/percent-retransmissions-1

# scan temporary file for retransmissions (column 8 > 0) and write those lines
# to temporary file -2
# to temporary file -2 (and change permissions to 666)


awk '($8 > 0) {print $0}' /tmp/percent-retransmissions-1 > \
/tmp/percent-retransmissions-2
/tmp/percent-retransmissions-2 ; chmod 666 /tmp/percent-retransmissions-2


# For each line in temporary file -2 find the lines in temporary file -1 that
# match all the fields except the count and retransmission flag. There will
# always be two lines since there has to be at least 1 un-retransmitted line.
# combine those two lines into 1 line and write temporary file -3
# combine those two lines into 1 line and write temporary file -3 (and
# change permissions to 666)

cat /tmp/percent-retransmissions-2 | \
while read count stream sip sp ttl dip dp retran; do
egrep "$stream\s*$sip\s*$sp\s*$ttl\s*$dip\s*$dp" \
/tmp/percent-retransmissions-1 | tr "\n" " "; echo; done > \
/tmp/percent-retransmissions-3
/tmp/percent-retransmissions-3 ; chmod 666 /tmp/percent-retransmissions-3

# Finally, for each line in temporary file -3 extract out the not-retransmitted
# count, the TCP stream source IP/port and destination IP/port, the TTL and the
Expand All @@ -108,5 +111,8 @@ cat /tmp/percent-retransmissions-2 | \
awk '{print "Stream: " $2 " " $3 ":" $4 " -> " $6 ":" $7 " TTL: " $5 " " \
$8 "/" $1 "*100 = " $8/$1*100}' /tmp/percent-retransmissions-3

# Afer the script runs, let's clean up /tmp/
rm /tmp/percent-retransmissions*

#
# percent-retransmissions.sh ends here