Use dumpcap for ttcn3-tcpdump-*.sh if available
Check if dumpcap is installed (either as suid or with appropriate
capabilities) and use it for packet capture instead of
'sudo tcpdump' if available. This makes it easier to use TTCN-3
testsuite as regular user without altering sudoers.
Change-Id: I77df04d51a469c924cf727f0596cc33565909746
diff --git a/ttcn3-tcpdump-start.sh b/ttcn3-tcpdump-start.sh
index b8ad01a..9bf3c0a 100755
--- a/ttcn3-tcpdump-start.sh
+++ b/ttcn3-tcpdump-start.sh
@@ -2,6 +2,7 @@
PIDFILE=/tmp/dumper.pid
TCPDUMP=/usr/sbin/tcpdump
+DUMPCAP=/usr/bin/dumpcap
TESTCASE=$1
echo "------ $TESTCASE ------"
@@ -23,6 +24,21 @@
# "laforge ALL=NOPASSWD: /usr/sbin/tcpdump, /bin/kill" in your sudoers file
CMD="sudo $TCPDUMP -U"
fi
+
+if [ -x $DUMPCAP ]; then
+ CAP_ERR="1"
+ if [ -x /sbin/setcap ]; then
+ # N. B: this check requires libcap2-bin package
+ setcap -q -v 'cap_net_admin,cap_net_raw=pie' $DUMPCAP
+ CAP_ERR="$?"
+ fi
+ if [ -u $DUMPCAP -o "$CAP_ERR" = "0" ]; then
+ CMD="$DUMPCAP -q"
+ else
+ echo "NOTE: unable to use dumpcap due to missing capabilities or suid bit"
+ fi
+fi
+
$CMD -s 1500 -n -i any -w "$TTCN3_PCAP_PATH/$TESTCASE.pcap" >$TTCN3_PCAP_PATH/$TESTCASE.pcap.stdout 2>&1 &
PID=$!
echo $PID > $PIDFILE