from scapy.all import rdpcap, UDP

def parser_hw_binary_detail(s):
    len_list = [i * 2 for i in [1, 1, 2, 4, 4, 2, 1, 1]]
    head_s = s[0:sum(len_list)]
    head = []
    start = 0
    for l in len_list:
        head.append(head_s[start:start + l])
        start += l
    [Version, LogType, Count, Second, FlowSequence, DeviceId, Slot, Reserved] = head
    print(head)

    body_start = sum(len_list)
    len_list = [i * 2 for i in [1, 1, 1, 1, 4, 4, 4, 4, 2, 2, 2, 2, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 2, 4]]
    bodys = []
    for i in range(int(Count, 16)):
        body_s = s[body_start:body_start+sum(len_list)]
        body = []
        start = 0
        for l in len_list:
            body.append(body_s[start:start + l])
            start += l
        [Prot, Operator, IpVersion, TosIPv4, SourceIP, SrcNatIP, DestIP, DestNatIP, SrcPort, SrcNatPort, DestPort, DestNatPort, StartTime, EndTime, InTotalPkg, InTotalByte, OutTotalPkg, OutTotalByte, SourVpnIndex, DestVpnIndex, Reserved1, EventTrend, Reserved2, Reserved3] = body
        print(body)

def parser_hw_binary(s):
    sum_ = 0
    counts = [0, 0, 0, 0, 0]

    len_list = [i * 2 for i in [1, 1, 2, 4, 4, 2, 1, 1]]
    head_s = s[0:sum(len_list)]
    Count = head_s[4:8]
    sum_ += int(Count, 16)

    body_start = sum(len_list)
    len_list = [i * 2 for i in [1, 1, 1, 1, 4, 4, 4, 4, 2, 2, 2, 2, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 2, 4]]
    for i in range(int(Count, 16)):
        body_s = s[body_start:body_start+sum(len_list)]
        EventTrend = min(int(body_s[114:116]), 4)
        counts[EventTrend] += 1
        body_start += sum(len_list)
    return (sum_, counts)

def parser_nat(s):
    counts = [0, 0, 0]
    for i in range(20):
        body_s = s[i*46*2:(i+1)*46*2]
        EventTrend = body_s[36:38]
        EventTrend = min(int(body_s[36:38]), 2)
        counts[EventTrend] += 1
    return counts

def read_and_filter_pcap_hw(pcap_file, protocol="UDP"):
    nat_num = 0
    count_nums = [0, 0, 0, 0, 0]
    
    packets = rdpcap(pcap_file)
    for pkt in packets:
        if protocol in pkt:
            # print(packet.show())  # 显示每个符合条件的数据包详情
            udp_payload = bytes(pkt[UDP].payload)
            hex_payload = ''.join(f'{byte:02x}' for byte in udp_payload)
            (sum_, counts) = parser_hw_binary(hex_payload)
            nat_num += sum_
            for i in range(5):
                count_nums[i] += counts[i]
        
    print(f"Total {len(packets)} {protocol} packets in hw_binary found.")
    print(f"unknown(00) log:\t{count_nums[0]}/{nat_num}({count_nums[0]/nat_num:.2f}%)")
    print(f"build(01) log:\t{count_nums[1]}/{nat_num}({count_nums[1]/nat_num:.2f}%)")
    print(f"aged(02) log:\t{count_nums[2]}/{nat_num}({count_nums[2]/nat_num:.2f}%)")
    print(f"period(03) log:\t{count_nums[3]}/{nat_num}({count_nums[3]/nat_num:.2f}%)")
    print(f"unknown(>03) log:\t{count_nums[4]}/{nat_num}({count_nums[4]/nat_num:.2f}%)")

def read_and_filter_pcap_nat(pcap_file, protocol="UDP"):
    nat_num = 0
    count_nums = [0, 0, 0]
    
    packets = rdpcap(pcap_file)
    for pkt in packets:
        if protocol in pkt:
            # print(packet.show())  # 显示每个符合条件的数据包详情
            udp_payload = bytes(pkt[UDP].payload)
            hex_payload = ''.join(f'{byte:02x}' for byte in udp_payload)
            counts = parser_nat(hex_payload)
            for i in range(3):
                count_nums[i] += counts[i]
        
    print(f"Total {len(packets)} {protocol} packets in nat_format found.")
    nat_num = len(packets)*20
    print(f"add(00) log:\t{count_nums[0]}/{nat_num}({count_nums[0]/nat_num:.2f}%)")
    print(f"del(01) log:\t{count_nums[1]}/{nat_num}({count_nums[1]/nat_num:.2f}%)")
    print(f"unknown(>01) log:\t{count_nums[2]}/{nat_num}({count_nums[2]/nat_num:.2f}%)")
    
 
if __name__ == "__main__":
    pcap_file_path = "D://MESA//搞点项目//NAT//nat-pcap//hw_binary_1021.pcap"
    read_and_filter_pcap_hw(pcap_file_path)
    pcap_file_path = "D://MESA//搞点项目//NAT//nat-pcap//nat_1021.pcap"
    read_and_filter_pcap_nat(pcap_file_path)
    # print('ok!')