3_7_detect_inactive_machines.py 文件源码

def detect_inactive_hosts(scan_hosts):
    """ 
    Scans the network to find scan_hosts are live or dead
    scan_hosts can be like 10.0.2.2-4 to cover range. 
    See Scapy docs for specifying targets.   
    """
    global scheduler
    scheduler.enter(RUN_FREQUENCY, 1, detect_inactive_hosts, (scan_hosts, ))
    inactive_hosts = []
    try:
        ans, unans = sr(IP(dst=scan_hosts)/ICMP(), retry=0, timeout=1)
        ans.summary(lambda r : r.sprintf("%IP.src% is alive"))
        for inactive in unans:
            print ("%s is inactive" %inactive.dst)
            inactive_hosts.append(inactive.dst)

        print ("Total %d hosts are inactive" %(len(inactive_hosts)))


    except KeyboardInterrupt:
        exit(0)