From 9dcd19548b57e80726d53ec4f9253f1809a2d04a Mon Sep 17 00:00:00 2001
From: Robin Krahl <guskraro@student.gu.se>
Date: Sat, 14 Oct 2017 04:16:44 +0000
Subject: script: measure-packets: Adapt for usage over SSH

---
 broccoli/script/measure-packets.sh | 45 +++++++++++++++++---------------------
 1 file changed, 20 insertions(+), 25 deletions(-)

diff --git a/broccoli/script/measure-packets.sh b/broccoli/script/measure-packets.sh
index af38624..a141885 100644
--- a/broccoli/script/measure-packets.sh
+++ b/broccoli/script/measure-packets.sh
@@ -1,11 +1,21 @@
 #!/bin/bash
 
+# This function has to execute the given arguments on the target machine.
+# For local execution, this could look like:
+#     sudo bash -c "$@"
+# Or for remote execution:
+#     ssh -i ~/.ssh/id_rsa root@remote "$@"
+# Make sure that the command is executed by root.
+
+function execute_command {
+	bash -c "$@"
+}
+
 function measure_packets {
 	TCPREPLAY_SPEED=$1
 	TCPREPLAY_COUNT=$2
 
-	bro -i "${BRO_INTERFACE}" -C -b Log::default_writer=Log::WRITER_NONE "${BRO_SCRIPT}" 2> bro-err.txt &
-	BRO_PID=$!
+	BRO_PID=$(execute_command "bro -i \"${BRO_INTERFACE}\" -C -b Log::default_writer=Log::WRITER_NONE \"${BRO_SCRIPT}\" > ${BRO_DIR}/bro-out.txt 2> ${BRO_DIR}/bro-err.txt & echo \$!")
 
 	tcpreplay -i "${BRO_INTERFACE}" -M "${TCPREPLAY_SPEED}" -L "${TCPREPLAY_COUNT}" "${TCPREPLAY_DUMP}" > /dev/null 2> /dev/null
 
@@ -13,13 +23,13 @@ function measure_packets {
 	while [[ $(echo "${PCPU}>50" | bc) -eq 1 ]]
 	do
 		sleep 1
-		PCPU=$(ps -q ${BRO_PID} -o pcpu --no-headers)
+		PCPU=$(execute_command "ps -q ${BRO_PID} -o pcpu --no-headers")
 	done
 
-	kill -SIGINT "${BRO_PID}"
-	sleep 1
+	execute_command "kill -SIGINT \"${BRO_PID}\""
+	execute_command "while kill -0 ${BRO_PID} 2>/dev/null ; do sleep 0.1 ; done"
 
-	tail -1 bro-err.txt | awk -F' ' '{print $5}'
+	execute_command "tail -1 ${BRO_DIR}/bro-err.txt" | sed 's/.* \([0-9]\+\) packets received.*/\1/'
 }
 
 if [[ $# -ne 3 ]]
@@ -36,24 +46,12 @@ then
 	exit 1
 fi
 
-if [[ $(id -u) -ne 0 ]]
-then
-	echo "Must be run as root. Aborting."
-	exit 1
-fi
-
 BRO_SCRIPT=$1
 BRO_INTERFACE=$2
 TCPREPLAY_DUMP=$3
 
-SPEEDS=(400 200 100 50 25)
-COUNTS=($(seq 400000 100000 2600000))
-
-if [[ ! -r "${BRO_SCRIPT}" ]]
-then
-	echo "The Bro script '${BRO_SCRIPT}' does not exist. Aborting."
-	exit 1
-fi
+SPEEDS=(100 50 25)
+COUNTS=(1000000 2000000 4000000)
 
 if [[ ! -r "${TCPREPLAY_DUMP}" ]]
 then
@@ -61,12 +59,9 @@ then
 	exit 1
 fi
 
-BRO_SCRIPT=$(realpath "${BRO_SCRIPT}")
 TCPREPLAY_DUMP=$(realpath "${TCPREPLAY_DUMP}")
 
-BRO_DIR=$(mktemp --directory --tmpdir bro.XXX)
-
-cd "${BRO_DIR}"
+BRO_DIR=$(execute_command "mktemp --directory --tmpdir bro.XXX")
 
 echo -ne "sent\t"
 for SPEED in ${SPEEDS[@]}
@@ -86,4 +81,4 @@ do
 	echo
 done
 
-rm -rf "${BRO_DIR}"
+execute_command "rm -rf \"${BRO_DIR}\""
-- 
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