import commands, re, json, urllib2, binascii
PREFIX = "192.168.1" #Network prefix
MIN = "0" #Starting network address, eg 192.168.1.0
MAX = "12" #Closing network address, e.g. 192.168.1.55
results = []
def escapeMe(message): #Escape characters (using ASCII value) not allowed in JSON
    new = ""
    for num in range(len(message)):
        char_code = ord(message[num])
        if char_code < 32 or char_code == 39 or char_code == 34 or char_code == 92:
            new = new + "%" + binascii.hexlify(message[num])
        else:
            new = new + message[num]
    return new

def sendDevice(gotcha): #Send the device report to the server as a POST
    try:
        url = "http://127.0.0.1:3707/new/" #Server address
        gotcha = escapeMe(gotcha)
        values = json.dumps({'device' : str(gotcha)})
        req = urllib2.Request(url)
        req.add_header('Content-Type', 'application/json')
        rsp = urllib2.urlopen(req, values)
        code = rsp.getcode()
    except Exception, e:
        print e

def removeDevice(ip): #Send request to remove device
    try:
        ip = ip.replace('.','-')
        url = "http://127.0.0.1:3707/remove/"+ip+"/"
        rsp = urllib2.urlopen(url)
        code = rsp.getcode()
    except Exception, e:
        print e

def main():
    global results
    while 1:
        new = commands.getoutput('for i in {'+MIN+'..'+MAX+'}; do ping -c 1 -t 1 '+PREFIX+'.$i | grep "from"; done') #Ping sweep the network to find connected devices
        tmp = re.findall(PREFIX+".(d+)", str(new)) #Pull out IP addresses from the ping results
        if tmp != results:
            for ip in tmp:
                if ip not in results:
                    gotcha = commands.getoutput('nmap -v -A -Pn '+PREFIX+'.'+ip) #nmap new devices found on the network
                    sendDevice(gotcha) #send device record to server
            for r in results:
                if r not in tmp:
                    removeDevice(PREFIX+'.'+r) #remove device if it wasn't found in the latest ping
            results = tmp

if __name__ == "__main__":
    main()