03_07_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 spefifying 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(s, 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)