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Python网络安全实战(7/10):Scapy数据包捕获与分析

  • 2026-06-29 22:22:48
Python网络安全实战(7/10):Scapy数据包捕获与分析

## 引言

Scapy是一个强大的Python网络数据包操纵库。它可以构造、发送、捕获和分析网络数据包,是网络安全工程师和网络管理员的必备工具。

本文将教你如何使用Scapy进行网络流量分析和数据包处理。

>**法律声明**:捕获和分析网络流量仅应用于你自己的网络或获得书面授权的网络。未经授权的监听可能违反《网络安全法》。

## 第一部分:Scapy基础

```python

# 安装: pip install scapy

from scapy.all import *

import time

import struct

classPacketAnalyzer:

"""

    网络数据包分析器

    Scapy支持解析数百种协议,这里演示最基础的用法。

    """

def__init__(selfinterfacestr = None):

"""

        初始化分析器

        Args:

            interface: 网络接口名称(如 'eth0', 'Wi-Fi')

        """

self.interface = interface or conf.iface

self.packet_count = 0

self.protocol_stats = {}

defhello_scapy(self):

"""Scapy的Hello World —— 发送一个ping包"""

print("[*] 发送ICMP Ping包...")

        answer, unanswered = sr(IP(dst="127.0.0.1") / ICMP(),

timeout=2verbose=False)

for sent, recv in answer:

print(f"  响应: {recv[IP].src} 延迟: "

f"{recv.time - sent.time:.4f}s")

defcapture_packets(selfcountint = 10,

filter_expstr = None) -> list:

"""

        抓包

        Args:

            count: 捕获的包数量

            filter_exp: pcap过滤器表达式(如 "tcp port 80")

        Returns:

            捕获的Packet列表

        """

print(f"[*] 正在捕获 {count} 个数据包...")

print(f"[*] 网络接口: {self.interface}")

if filter_exp:

print(f"[*] 过滤器: {filter_exp}")

        packets = sniff(count=count,

iface=self.interface,

prn=self._display_packet,

filter=filter_exp)

print(f"\n[*] 共捕获 {len(packets)} 个数据包")

returnlist(packets)

def_display_packet(selfpacket):

"""

        显示单个包的简要信息

        这是sniff回调函数的典型用法——

        每收到一个包就调用此函数。

        """

self.packet_count += 1

self._count_protocol(packet)

# 提取基本信息

ifIPin packet:

            src = packet[IP].src

            dst = packet[IP].dst

            proto = packet[IP].proto

            ttl = packet[IP].ttl

            proto_names = {

1"ICMP"6"TCP"17"UDP",

50"ESP"51"AH"89"OSPF"

            }

            proto_name = proto_names.get(proto, f"未知({proto})")

# 获取层信息

            layer_info = ""

ifTCPin packet:

                layer_info = (f"TCP {src}:{packet[TCP].sport} "

f"-> {dst}:{packet[TCP].dport}")

                flags = ""

if packet[TCP].flags.S: flags += "S"

if packet[TCP].flags.A: flags += "A"

if packet[TCP].flags.P: flags += "P"

if packet[TCP].flags.F: flags += "F"

if flags:

                    layer_info += f" [{flags}]"

elifUDPin packet:

                layer_info = (f"UDP {src}:{packet[UDP].sport} "

f"-> {dst}:{packet[UDP].dport}")

elifICMPin packet:

                layer_info = (f"ICMP {src} -> {dst} "

f"type={packet[ICMP].type} "

f"code={packet[ICMP].code}")

print(f"  #{self.packet_count}: "

f"{proto_name:<6} "

f"{layer_info}")

def_count_protocol(selfpacket):

"""统计各协议出现的次数"""

ifIPin packet:

            proto = packet[IP].proto

            proto_names = {

1"ICMP"6"TCP"17"UDP",

50"ESP"51"AH"89"OSPF"

            }

            name = proto_names.get(proto, f"Proto-{proto}")

self.protocol_stats[name] = self.protocol_stats.get(name, 0) + 1

defshow_protocol_stats(self):

"""显示协议统计结果"""

print("\n" + "=" * 60)

print("协议统计")

print("=" * 60)

for proto, count insorted(self.protocol_stats.items(),

key=lambdax: x[1], reverse=True):

print(f"  {proto:<12}{count:>5} 包")

defanalyze_tcp_handshake(selfpacketslist):

"""

        分析TCP三次握手

        TCP三次握手是网络连接的基础:

        1. Client -> Server: SYN (synchronize)

        2. Server -> Client: SYN-ACK (synchronize-acknowledge)

        3. Client -> Server: ACK (acknowledge)

        """

print("\n" + "=" * 60)

print("TCP握手分析")

print("=" * 60)

        handshake_sequences = {}

for packet in packets:

ifTCPin packet andIPin packet:

                src = packet[IP].src

                dst = packet[IP].dst

                sport = packet[TCP].sport

                dport = packet[TCP].dport

                flags = str(packet[TCP].flags)

# 识别SYN包

if'S'in flags and'A'notin flags:

                    seq_key = f"{src}:{sport} -> {dst}:{dport}"

                    handshake_sequences[seq_key] = {

"syn": packet.time,

"syn_ack"None,

"ack"None

                    }

# 识别SYN-ACK包

if'SA'in flags:

# 查找对应的SYN方向

for seq_key, sequence in handshake_sequences.items():

if seq_key.endswith(f"->{src}:{dport}"):

                            reverse = f"{dst}:{dport} -> {src}:{sport}"

if reverse in handshake_sequences:

                                handshake_sequences[reverse]["syn_ack"] = packet.time

break

# 识别ACK包(仅第三次)

if'A'in flags and'S'notin flags:

for seq_key, sequence in handshake_sequences.items():

if seq_key.endswith(f"->{dst}:{dport}"):

                            handshake_sequences[seq_key]["ack"] = packet.time

break

for seq_key, sequence in handshake_sequences.items():

if sequence["syn"]:

                syn_time = sequence["syn"]

                syn_ack_time = sequence.get("syn_ack"or syn_time

                ack_time = sequence.get("ack"or syn_time

                latency1 = syn_ack_time - syn_time

                latency2 = ack_time - syn_ack_time

                total = latency2 + latency1

print(f"\n  连接: {seq_key}")

print(f"    SYN     -> {latency1*1000:.1f}ms")

print(f"    SYN-ACK -> {latency2*1000:.1f}ms")

print(f"    总握手延迟: {total*1000:.1f}ms")

defanalyze_http_traffic(selfpacketslist):

"""

        分析HTTP流量

        识别HTTP请求和响应,提取关键信息

        """

print("\n" + "=" * 60)

print("HTTP流量分析")

print("=" * 60)

        http_requests = {}

        http_responses = {}

for packet in packets:

if Raw in packet andIPin packet:

                payload = packet[Raw].load.decode("utf-8"errors="ignore")

                src = packet[IP].src

                dst = packet[IP].dst

if payload.startswith(("GET ""POST ""PUT ""DELETE ",

"HEAD ""OPTIONS ""PATCH ")):

                    parts = payload.split("\r\n")

                    first_line = parts[0]

                    method, path, protocol = first_line.split(" "2)

                    key = f"{src}:{packet[TCP].sport} -> {dst}:{packet[TCP].dport}"

                    http_requests[key] = {

"method": method,

"path": path,

"protocol": protocol,

"raw": first_line,

"headers": {}

                    }

# 提取头部

for line in parts[1:]:

if": "in line:

                            h_name, h_value = line.split(": "1)

                            http_requests[key]["headers"][h_name] = h_value

elif payload.startswith(("HTTP/1.""HTTP/2.")):

                    parts = payload.split("\r\n")

                    first_line = parts[0]

                    protocol, status_code, status_msg = first_line.split(" "2)

                    key = f"{src}:{packet[TCP].sport} -> {dst}:{packet[TCP].dport}"

                    http_responses[key] = {

"protocol": protocol,

"status": status_code,

"message": status_msg,

                    }

print("\n【HTTP请求】")

for key, req in http_requests.items():

print(f"  {req['method']:7s}{req['path'][:50]:50s} "

f"-> {req['headers'].get('Host''?')[:30]}")

print("\n【HTTP响应】")

for key, resp in http_responses.items():

print(f"  {resp['protocol']}{resp['status']}{resp['message']}")

# ===== 数据包构造示例 =====

classPacketBuilder:

"""

    自定义数据包构造器

    展示了如何使用Scapy构建各种网络数据包

    """

@staticmethod

defconstruct_ping():

"""构造一个简单的ICMP Ping包"""

print("[*] 构造ICMP Ping包")

        ping = IP(dst="127.0.0.1") / ICMP()

print(f"  数据包: {ping.summary()}")

# print(f"  完整内容:\n{ping.show()}")

@staticmethod

defconstruct_tcp_syn(ipstrportint):

"""构造TCP SYN包(半开放扫描的基础)"""

print(f"[*] 构造TCP SYN包 -> {ip}:{port}")

        syn = IP(src="192.168.1.100"dst=ip) / \

              TCP(sport=RandShort(), dport=port, flags="S")

print(f"  数据包: {syn.summary()}")

print(f"  源IP: {syn[IP].src}")

print(f"  目标IP: {syn[IP].dst}")

print(f"  源端口: {syn[TCP].sport}")

print(f"  目标端口: {syn[TCP].dport}")

print(f"  标志: {syn[TCP].flags}")

@staticmethod

defconstruct_dns_query(domainstr = "example.com"):

"""构造DNS查询包"""

print(f"[*] 构造DNS查询: {domain}")

        dns_pkt = IP(dst="8.8.8.8") / UDP() / \

                  DNS(rd=1qd=DNSQR(qname=domain, qtype="A"))

print(f"  数据包: {dns_pkt.summary()}")

# 发送并等待响应

        ans, unans = sr(dns_pkt, timeout=2verbose=False)

for sent, recv in ans:

ifDNSin recv and pkt[RR]:

                answers = recv[DNS].an

if answers:

print(f"  响应: {answers.rdata}")

@staticmethod

defconstruct_arp_request(networkstr = "192.168.1.0/24"):

"""构造ARP请求包"""

print(f"[*] 构造ARP请求: 查询 {network}")

        arp = ARP(pdst=network)

        ether = Ether(bcast="ff:ff:ff:ff:ff:ff")

        arp_pkt = ether / arp

print(f"  数据包: {arp_pkt.summary()}")

# ===== 主程序演示 =====

if__name__ == "__main__":

# 1. Hello Scapy

    analyzer = PacketAnalyzer()

    analyzer.hello_scapy()

# 2. 构造数据包

    builder = PacketBuilder()

    builder.construct_ping()

    builder.construct_tcp_syn("192.168.1.1"80)

    builder.construct_dns_query("example.com")

# 3. 抓包分析

print("\n" + "=" * 60)

print("抓包分析")

print("=" * 60)

    packets = analyzer.capture_packets(count=5,

filter_exp="tcp or udp")

    analyzer.show_protocol_stats()

```

## 第二部分:进阶用法

### 网络扫描器(基于Scapy)

```python

classScapyPortScanner:

"""

    使用Scapy实现的轻量级端口扫描器

    比Socket方式更灵活,可以自定义标志位

    """

def__init__(selftargetstrinterfacestr = None):

self.target = target

self.interface = interface or conf.iface

defscan_port(selfportinttimeoutfloat = 1.0) -> str:

"""扫描单个端口"""

        pkt = IP(dst=self.target) / TCP(dport=port, flags="S")

        ans = sr1(pkt, timeout=timeout, verbose=False)

if ans isNone:

return"FILTERED"

elif ans.haslayer(TCP):

if ans[TCP].flags == 0x12:  # SYN-ACK

# 发送RST重置连接

                rsto = IP(dst=self.target) / \

                       TCP(dport=port, flags="RA")

                send(rsto, verbose=False)

return"OPEN"

elif ans[TCP].flags == 0x14:  # RST-ACK

return"CLOSED"

return"UNKNOWN"

defscan_ports(selfportslist) -> dict:

"""批量扫描端口"""

        results = {}

for port in ports:

            status = self.scan_port(port)

            results[port] = status

if status == "OPEN":

print(f"  [+] OPEN:  {port}")

elif status == "CLOSED":

print(f"  [-] CLOSED: {port}")

else:

print(f"  [?] {status}{port}")

return results

```

## 实战练习

### 练习1:ARP欺骗检测器

编写一个程序检测网络中的ARP欺骗:

- 监控ARP响应包

- 检测同一IP是否有多个MAC地址

- 记录可疑活动的详细信息

### 练习2:自定义协议解析器

编写一个工具解析特定协议(如DNS、HTTP、SSH握手):

- 从捕获的包中提取协议特征

- 展示每个字段的含义

- 标注异常情况

### 练习3:流量可视化仪表板

使用Scapy捕获数据,结合Matplotlib绘制流量图表:

- 每小时/每天的流量趋势

- Top 10通信对(谁在和谁聊天)

- 协议分布饼图

## 总结

本篇教程涵盖了:

- ✅ Scapy基础用法

- ✅ 数据包捕获和分析

- ✅ TCP握手分析

- ✅ HTTP流量提取

- ✅ 自定义数据包构造

- ✅ Scapy端口扫描

掌握了数据包分析后,下一节我们将学习:**DNS信息收集工具**——利用DNS协议进行域名信息收集和技术栈识别。

---

> ⚖️ **版权声明**:本教程仅供学习和研究用途。

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  1. CONNECT:[ UseTime:0.001076s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001687s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.011010s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000723s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001374s ]
  6. SELECT * FROM `set` [ RunTime:0.000624s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001867s ]
  8. SELECT * FROM `article` WHERE `id` = 501575 LIMIT 1 [ RunTime:0.001320s ]
  9. UPDATE `article` SET `lasttime` = 1783006086 WHERE `id` = 501575 [ RunTime:0.005086s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.019867s ]
  11. SELECT * FROM `article` WHERE `id` < 501575 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007441s ]
  12. SELECT * FROM `article` WHERE `id` > 501575 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001718s ]
  13. SELECT * FROM `article` WHERE `id` < 501575 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001717s ]
  14. SELECT * FROM `article` WHERE `id` < 501575 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009774s ]
  15. SELECT * FROM `article` WHERE `id` < 501575 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009959s ]
0.246461s