116 lines
3.0 KiB
Bash
Executable File
116 lines
3.0 KiB
Bash
Executable File
#!/bin/sh
|
|
|
|
PIDFILE_PCAP=/tmp/pcap.pid
|
|
TCPDUMP=$(command -v tcpdump)
|
|
DUMPCAP=$(command -v dumpcap)
|
|
|
|
PIDFILE_NETCAT=/tmp/netcat.pid
|
|
NETCAT=$(command -v nc)
|
|
GSMTAP_PORT=4729
|
|
|
|
TESTCASE=$1
|
|
|
|
|
|
SUDOSTR=""
|
|
if ! [ "$(id -u)" = "0" ]; then
|
|
SUDOSTR="sudo -n"
|
|
# Otherwise, if sudo /usr/bin/kill, sudo /usr/bin/tcpdump cannot be run without a password prompt,
|
|
# and this script will hang indefinitely
|
|
fi
|
|
|
|
kill_rm_pidfile() {
|
|
# NOTE: This requires you to be root or something like
|
|
# "laforge ALL=NOPASSWD: /usr/sbin/tcpdump, /bin/kill" in your sudoers file
|
|
if [ -e "$1" ]; then
|
|
if [ -s "$1" ]; then
|
|
$SUDOSTR kill "$(cat "$1")" 2>&1 | grep -v "No such process"
|
|
fi
|
|
rm $1
|
|
fi
|
|
}
|
|
|
|
echo "------ $TESTCASE ------"
|
|
date
|
|
|
|
if [ "z$TTCN3_PCAP_PATH" = "z" ]; then
|
|
TTCN3_PCAP_PATH=/tmp
|
|
fi
|
|
|
|
kill_rm_pidfile $PIDFILE_NETCAT
|
|
kill_rm_pidfile $PIDFILE_PCAP
|
|
|
|
CMD="$SUDOSTR $TCPDUMP -U"
|
|
|
|
if [ -x "$DUMPCAP" ]; then
|
|
CAP_ERR="1"
|
|
if [ -x /sbin/setcap ]; then
|
|
# N. B: this check requires libcap2-bin package
|
|
/sbin/setcap -q -v 'cap_net_admin,cap_net_raw=pie' $DUMPCAP
|
|
CAP_ERR="$?"
|
|
fi
|
|
|
|
# did we implicitly inherit all those caps because we're root in a netns?
|
|
if [ -u $DUMPCAP -o "$CAP_ERR" = "1" ]; then
|
|
getpcaps 0 2>&1 | grep -e cap_net_admin | grep -q -e cap_net_raw
|
|
CAP_ERR="$?"
|
|
fi
|
|
|
|
# did we implicitly inherit all those caps because we're root in a netns?
|
|
if [ -u $DUMPCAP -o "$CAP_ERR" = "1" ]; then
|
|
getpcaps 0 2>&1 | grep -q -e " =ep" # all perms
|
|
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
|
|
|
|
# Create a dummy sink for GSMTAP packets
|
|
$NETCAT -l -u -k -p $GSMTAP_PORT >/dev/null 2>$TESTCASE.netcat.stderr &
|
|
PID=$!
|
|
echo $PID > $PIDFILE_NETCAT
|
|
|
|
CMD_OUTFILE=$TTCN3_PCAP_PATH/$TESTCASE.pcap.stdout
|
|
CMD_OUTFILE_ERR=$TTCN3_PCAP_PATH/$TESTCASE.pcap.stderr
|
|
FIFO=/tmp/cmderr
|
|
if ! [ -e $FIFO ]; then
|
|
mkfifo $FIFO
|
|
else
|
|
echo "Warning: Named pipe already exists: $FIFO"
|
|
fi
|
|
|
|
# Log stderr to CMD_OUTFILE and a dedicated error log file
|
|
tee $CMD_OUTFILE < $FIFO > $CMD_OUTFILE_ERR &
|
|
CMD_STR="$CMD -s 1520 -n -i any -w \"$TTCN3_PCAP_PATH/$TESTCASE.pcap\" >$CMD_OUTFILE 2>$FIFO &"
|
|
eval $CMD_STR
|
|
# $CMD -s 1520 -n -i any -w \"$TTCN3_PCAP_PATH/$TESTCASE.pcap\" >$CMD_OUTFILE &
|
|
PID=$!
|
|
echo $PID > $PIDFILE_PCAP
|
|
if [ -f $CMD_OUTFILE_ERR ] && [ $(wc -l $CMD_OUTFILE_ERR | awk '{print $1}') -ne 0 ]; then
|
|
echo "Warnings or error messages from command:" >&2
|
|
echo " $CMD_STR" >&2
|
|
echo "Message:" >&2
|
|
echo "$(cat $CMD_OUTFILE_ERR)" | sed 's/^/\t/' >&2
|
|
fi
|
|
|
|
# Wait until packet dumper creates the pcap file and starts recording.
|
|
# We generate some traffic until we see packet dumper catches it.
|
|
# Timeout is 10 seconds.
|
|
ping 127.0.0.1 >/dev/null 2>&1 &
|
|
PID=$!
|
|
i=0
|
|
while [ ! -f "$TTCN3_PCAP_PATH/$TESTCASE.pcap" ] ||
|
|
[ "$(stat -c '%s' "$TTCN3_PCAP_PATH/$TESTCASE.pcap")" -eq 32 ]
|
|
do
|
|
echo "Waiting for packet dumper to start... $i"
|
|
sleep 1
|
|
i=$((i+1))
|
|
if [ $i -eq 10 ]; then
|
|
break
|
|
fi
|
|
done
|
|
kill $PID
|