8_5_modify_ip_in_a_packet.py 文件源码

def send_packet(protocol=None, src_ip=None, src_port=None, flags=None, dst_ip=None, dst_port=None, iface=None):
    """Modify and send an IP packet."""
    if protocol == 'tcp':
        packet = IP(src=src_ip, dst=dst_ip)/TCP(flags=flags, sport=src_port, dport=dst_port)
    elif protocol == 'udp':
        if flags: raise Exception(" Flags are not supported for udp")
        packet = IP(src=src_ip, dst=dst_ip)/UDP(sport=src_port, dport=dst_port)
    else:
        raise Exception("Unknown protocol %s" % protocol)

    send(packet, iface=iface)