Python使用DPKT实现分析数据包

>>> from scapy.all import *
>>>
>>> packets = sniff(count=2)                            # 动态抓取2个数据包
>>>
>>> wrpcap("d://lyshark.pcap",packets)                  # 保存数据包
>>> pcap_packets = rdpcap("d://lyshark.pcap")           # 读取数据包
>>>
>>> pcap_packets
<lyshark.pcap: TCP:2 UDP:0 ICMP:0 Other:0>
>>>
>>> pcap_packets.show()
0000 Ether / IP / TCP 192.168.1.101:63995 > 172.217.24.10:https S
0001 Ether / IP / TCP 192.168.1.101:63907 > 103.235.46.191:https A / Raw
>>>
>>> pcap_packets.summary()
Ether / IP / TCP 192.168.1.101:63995 > 172.217.24.10:https S
Ether / IP / TCP 192.168.1.101:63907 > 103.235.46.191:https A / Raw
>>>
>>> pcap_packets[0].dst
'FF:2d:1e:0f:1e:a1'
>>>
>>> pcap_packets[0].src
'a4:7e:33:ee:cc:b3'
>>>
# 如下分别代表: 链路层 [Ethernet]、网络层[IP]、传输层[TCP/UDP]、应用层[RAW]
>>> pcap_packets[0].show()
>>>
# 抓包后直接输出
>>> sniff(prn=lambda x: x.show(), count=1)

from scapy.all import *
import scapy.all as scapy

# 数据包回调函数
def packet_callback(packet):
    if packet[TCP].payload:
        m_packet = str(packet[TCP].payload)
        print("主机地址: {} ---> 数据包内容: {}".format(packet[IP].dst,packet[TCP].payload))

if __name__ == "__main__":
    # 抓取80端口的数据包并输出到屏幕
    # sniff(filter="tcp port 80", prn=packet_callback, store=0)

    # 抓取 过滤出tcp协议 抓取1分钟后保存到文件中
    package=sniff(filter="tcp", timeout=60, prn=packet_callback, store=1)
    wrpcap("d://lyshark.pcap", package)

from scapy.all import *
import scapy.all as scapy

# 解析获取到的数据包
def get_http_pcap(pcap_path):
    pcap_infos = list()
    packets = scapy.rdpcap(pcap_path)
    for p in packets:
        if p.haslayer("IP"):
            src_ip = p["IP"].src
            dst_ip = p["IP"].dst
        if p.haslayer("TCP"):
            raw_http = p["TCP"].payload.original
            sport = p["TCP"].sport
            dport = p["TCP"].dport
        if p.haslayer("HTTPRequest"):
            host = p["HTTPRequest"].Host
            uri = p["HTTPRequest"].Path
            http_fields = p["HTTPRequest"].fields
            # print("主机地址: {} --> URI: {}".format(host,uri))
        print("原IP地址: {}:{} --> 目标IP地址: {}:{}".format(src_ip,sport,dst_ip,dport))

if __name__ == "__main__":
    get_http_pcap("d://lyshark.pcap")

import dpkt
import socket

def GetDpkt(pcap):
    for timestamp,packet in pcap:
        try:
            eth = dpkt.ethernet.Ethernet(packet)
            ip = eth.data
            tcp = ip.data

            src = socket.inet_ntoa(ip.src)
            dst = socket.inet_ntoa(ip.dst)
            sport = tcp.sport
            dport = tcp.dport
            print("[+] 源地址: {}:{} --> 目标地址:{}:{}".format(src,sport,dst,dport))
        except Exception:
            pass

# 检测主机是否被DDOS攻击了
def FindDDosAttack(pcap):
    pktCount = {}
    for timestamp,packet in pcap:
        try:
            eth = dpkt.ethernet.Ethernet(packet)
            ip = eth.data
            tcp = ip.data
            src = socket.inet_ntoa(ip.src)
            dst = socket.inet_ntoa(ip.dst)
            sport = tcp.sport
            # 累计判断各个src地址对目标地址80端口访问次数
            if dport == 80:
                stream = src + ":" + dst
                if pktCount.has_key(stream):
                    pktCount[stream] = pktCount[stream] + 1
                else:
                    pktCount[stream] = 1
        except Exception:
            pass
    for stream in pktCount:
        pktSent = pktCount[stream]
        # 如果超过设置的检测阈值500,则判断为DDOS攻击行为
        if pktSent > 500:
            src = stream.split(":")[0]
            dst = stream.split(":")[1]
            print("[+] 源地址: {} 攻击: {} 流量: {} pkts.".format(src,dst,str(pktSent)))

# FindPcapURL 监控提取数据包中的所有URL
def FindPcapURL(pcap):
    Url = []
    for timestamp,packet in pcap:
        try:
            eth = dpkt.ethernet.Ethernet(packet)
            ip = eth.data
            src = socket.inet_ntoa(ip.src)
            tcp = ip.data
            http = dpkt.http.Request(tcp.data)
            if(http.method == "GET"):
                UrlHead = http.headers
                for key,value in UrlHead.items():
                    url = re.findall('^https*://.*',str(value))
                    if url:
                        print("[+] 源地址: %10s --> 访问URL: %-80s"%(src, url[0]))
        except Exception:
            pass
    return set(Url)

# 动态保存pcap文件(每1024字节保存一次pcap文件),并读取出其中的网址解析出来
def write_cap(pkt):
    global pkts
    global count
    pkts.append(pkt)
    count += 1
    if count == 1024:
        wrpcap("data.pcap",pkts)
        fp = open("./data.pcap","rb")
        pcap = dpkt.pcap.Reader(fp)
        FindPcapURL(pcap)
        fp.close()
        pkts,count = [],0

if __name__ == "__main__":
    fp = open("d://lyshark.pcap","rb")
    pcap = dpkt.pcap.Reader(fp)
    GetDpkt(pcap)