104 lines
2.6 KiB
Bash
Executable File
104 lines
2.6 KiB
Bash
Executable File
#!/bin/bash
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#
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# contrary to ttcn3-tcpdump-start.sh, this version is dumpcap-only and
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# needed when we want to capture from interfaces of different link
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# types. It will also store the results as pcap-ng, not plain old pcap.
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PIDFILE_PCAP=/tmp/pcap.pid
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DUMPCAP=/usr/bin/dumpcap
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PIDFILE_NETCAT=/tmp/netcat.pid
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NETCAT=/bin/nc
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GSMTAP_PORT=4729
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TESTCASE=$1
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kill_rm_pidfile() {
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if [ -e $1 ]; then
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kill "$(cat "$1")"
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rm $1
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fi
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}
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echo "------ $TESTCASE ------"
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date
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if [ "z$TTCN3_PCAP_PATH" = "z" ]; then
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TTCN3_PCAP_PATH=/tmp
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fi
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kill_rm_pidfile $PIDFILE_NETCAT
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kill_rm_pidfile $PIDFILE_PCAP
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if [ ! -x $DUMPCAP ]; then
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echo "Missing required dumpcap binary at ${DUMPCAP}"
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exit 31
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fi
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if [ "$(id -u)" = "0" ]; then
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CMD="$DUMPCAP -q"
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else
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CAP_ERR="1"
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if [ -x /sbin/setcap ]; then
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# N. B: this check requires libcap2-bin package
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/sbin/setcap -q -v 'cap_net_admin,cap_net_raw=pie' $DUMPCAP
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CAP_ERR="$?"
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fi
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if [ -u $DUMPCAP -o "$CAP_ERR" = "0" ]; then
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CMD="$DUMPCAP -q"
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else
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echo "NOTE: unable to use dumpcap due to missing capabilities or suid bit"
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exit 32
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fi
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fi
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# Create a dummy sink for GSMTAP packets
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$NETCAT -l -u -k -p $GSMTAP_PORT >/dev/null 2>$TESTCASE.netcat.stderr &
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PID=$!
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echo $PID > $PIDFILE_NETCAT
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# generate the list of interface arguments. For capturing from
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# interfaces of different link-layer types, we cannot use "-i all"
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# but must use dumpcap with each individual interface name. We also
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# must write pcapng files, as only those can record the interface of
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# each packet
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ADDL_ARGS="-i lo"
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for f in /sys/class/net/*; do
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DEV=`basename $f`
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if [[ "$DEV" == "hdlcnet"* ]]; then
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# skip these as we only want the hdlcX devices, avoid capturing twice on both sides
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continue
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elif [[ "$DEV" == "hdlc"* ]]; then
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# these are the user-side of the FR links, which is
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# what we interface with from our test suite, emulating
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# a BSS.
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ADDL_ARGS="${ADDL_ARGS} -i ${DEV}"
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elif [[ "$DEV" == "eth"* ]]; then
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# we blindly assume that "normal" docker network devices
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# are called ethXXX
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ADDL_ARGS="${ADDL_ARGS} -i ${DEV}"
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fi
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done
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$CMD -s 1500 -n ${ADDL_ARGS} -w "$TTCN3_PCAP_PATH/$TESTCASE.pcapng" >$TTCN3_PCAP_PATH/$TESTCASE.pcapng.stdout 2>&1 &
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PID=$!
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echo $PID > $PIDFILE_PCAP
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# Wait until packet dumper creates the pcap file and starts recording.
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# We generate some traffic until we see packet dumper catches it.
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# Timeout is 10 seconds.
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ping 127.0.0.1 >/dev/null 2>&1 &
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PID=$!
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i=0
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while [ ! -f "$TTCN3_PCAP_PATH/$TESTCASE.pcapng" ] ||
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[ "$(stat -c '%s' "$TTCN3_PCAP_PATH/$TESTCASE.pcapng")" -eq 32 ]
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do
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echo "Waiting for packet dumper to start... $i"
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sleep 1
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i=$((i+1))
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if [ $i -eq 10 ]; then
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break
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fi
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done
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kill $PID
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