Add luci-app-packet-capture

luci-app-packet-capture/root/usr/libexec/packet_capture_start

@@ -0,0 +1,69 @@
+#!/bin/sh
+
+. /usr/share/libubox/jshn.sh
+
+PIDFILE="/var/run/packet_capture.pid"
+
+if [ -f "$PIDFILE"];then
+    echo "error: Packet capture is running"
+    exit 1
+fi
+
+json_load "$1"
+json_get_var interface interface
+json_get_var filter filter
+json_get_var duration duration
+json_get_var packets packets
+json_get_var verbose verbose
+json_get_var domains domains
+json_get_var file file
+
+args="-n"
+
+if [ "$domains" == "1" ];then
+	args=""
+fi
+
+if  [ -n "$interface" ];then
+	ip a show "$interface" > /dev/null 2>&1
+	if [ "$?" == "1" ]; then
+        echo "error: Incorrect format of an interface"
+        exit 1
+    fi
+
+	args="$args -i $interface"
+fi
+
+if [ -n "$packets" ];then
+    echo "$packets" | egrep  '^[0-9]*$'
+    if [ "$?" -eq 0 ];then
+        args="$args -c $packets"
+    else
+        echo "error: Incorrect packets argument"
+        exit 1
+    fi
+fi
+
+if [ "$verbose" == "1"  ];then
+	args="$args  -e"
+fi
+
+if [ "$file" == "1" ];then
+	mem=$(awk '/MemTotal/ {print $2}' /proc/meminfo)
+	args="$args -W 2 -C $((mem/(1024 * 10))) -w /tmp/capture.pcap -z /usr/libexec/packet_capture_stop"
+fi
+
+if [ -n "$filter" ];then
+    tcpdump -i lo -d "$filter" >/dev/null 2>/dev/null
+	if [ $? -eq 1 ];then
+		echo "error: Incorrect filter argument"
+		exit 1
+	fi
+	echo "$filter" > /tmp/tcpdump_filter
+fi
+
+(/usr/libexec/packet_capture "$args" "$duration")&
+
+echo $! > /var/run/packet_capture.pid
+
+exit 0