genpcap.py 文件源码

def add_layers(nb_fields, nb_headers):
    class P4Bench(Packet):
        name = "P4Bench Message"
        fields_desc =  []
        for i in range(nb_fields):
            fields_desc.append(ShortField('field_%d' %i , 0))
    layers = ''
    for i in range(nb_headers):
        if i < (nb_headers - 1):
            layers = layers / P4Bench(field_0=1)
        else:
            layers = layers / P4Bench(field_0=0)
    return layers