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Apache-2.0

pcap2vec-base-dpdk

介绍

基于dpdk的pcap文件解析程序

软件架构

  1. 项目任务名称:PCAP2VEC程序开发

  2. 项目概要设计:

    1)项目背景:

    • 报文分析基本情况如下:

      60个文件,492M,基础协议:tcp udp icmp; 上层应用复杂多样:http , https, ftp, dns... ...

    • 目前信大要求提供的信息:流级统计信息共计66个 ;

    综合上述两点,本次开发仅支持TCP/UDP, icmp暂不开发待信大方明确特征后进行;

    任务:输入样本数据pcap文件中提取66维特征,输出csv形式文件。

    2)项目概要设计与说明:

workflow 上图为程序workflow,说明如下:

​ i) 任务分发模块:创建线程,线程数目暂定10个线程;根据pcap文件名字,将任务分发给各个线程;

​ ii) workflow:

​ (1)读取pcap文件;

​ (2)解析获取的数据包码流;从目前数据样例来看,解析MAC-------解析IPV4------解析TCP/UDP;

​ (3)查找/建立五元组流表;

​ (4)计算特征值;根据相关性将66维特征值分成3组(见文末);

​ (5)输出csv文件;基于简化开发工作的目的,每个线程输出一个csv文件;文件格式,特征维度顺序按照与信大方约定的接口方式组织;

安装教程

  1. git clone git@gitee.com:putty_git/pcap2vec-base-dpdk.git

  2. 目前环境已经在249上,创建了容器(84836e5197d6)主程序:/home/pcap2vec/nidps;dpdk:/home/pcap2vec/dpdk-stable-18.02.2 (大家创建自己的程序目录只要修改makefile文件中APP_DIR = /home/pcap2vec/nidps即可)

  3. 请按照nidps下面的makefile文件添加自己的代码。

协作说明

  1. 各位务必保证在容器环境下创建自己主程序目录nidps编译通过,且可以正常运行后在提交代码。
  2. 每天晚6点后,不要提交代码。
  3. 有问题请及时联系,务必保证在8.12号之前完成任务。

研发任务安排:

  • 建立项目工程,以gitee方式托管代码;
  • 程序workflow流程开发、任务分发模块开发;
  • pcap文件读取模块开发;
  • 五元组流表开发;
  • 数据包解析模块开发;
  • 特征组1开发;
  • 特征组2开发;
  • 特征组3开发;
  • 输出模块开发;
  • 程序集成测试;
  • 程序部署,暂以docker容器形式部署;制作image文件;

集成测试:

  1. 60个数据样例,分成四组,每人15个文件;
  2. 要求:1.15个文件跑完程序没有运行异常;2.从15个文件里面选5个文件,5个文件每个文件选择一个小流,验证输出数据准确性;

安装使用方法:

1)本项目提供docker image文件,下载地址:链接:https://pan.baidu.com/s/1SS_Fq2QXYzPD8_E6O8yInw 提取码:rzoq

2)装载镜像文件,启动容器,设置环境变量。

  i) 装载镜像:
docker load < pcap2vec-1.0.tar
  ii) 启动容器:
docker run -it --privileged -v /sys/bus/pci/drivers:/sys/bus/pci/drivers -v /sys/kernel/mm/hugepages:/sys/kernel/mm/hugepages -v /sys/devices/system/node:/sys/devices/system/node -v /dev:/dev pcap2vec:1.1
  iii) 设置环境变量
      export RTE_SDK=/home/dpdk/dpdk-stable-18.02.2
      export RTE_TARGET=x86_64-native-linuxapp-gcc
      export EXTRA_CFLAGS='-O0 -g'

3)执行命令启动数据包分析解析功能

      cd /home/pcap2vec/nidps
      ./build/nidps -c 0x1 -n 4 -- -i /home/pcap2vec/nidps/pcaps/ -o ./rst.csv
  -c 指定线程 16进制那一位置1表示那一位cpu启用;
  -n 内存通道不管;
  -i  输入pcap文件的所在目录,以'/'结尾;
  -o   结果输出csv文件

异常处理:

  1. 针对pcap数据包长度异常处理如下:
    1)int ParseL2ToL4LayerProtoInfo(const uint8_t *pkt, const struct pcap_pkthdr *pkthdr, FIVE_TUPLE_KEY *tuple_info, PKT_STATS_INFO *pkt_stats_info)
    解析接口增加一个入参:本次实际buffer长度reallen,即
   从 struct pcap_pkthdr *pkthdr 结构体中读取的长度超过reallen,则判断为当前报文被截断,需要从mac协议解析,修正一些协议字段;
   如果reallen== 读取的长度,认为报文没有截断; mbuf 增加保护超过1500长度截断;
    2)特征值计算时除了pktlen计算使用pktlen以外,其余协议长度计算包括(mac\ip\tcp\udp头部 segment)不要使用pktlen,使用具体的协议字段;
    3)尽快完成自查自改;

项目更改记录

1. ===8.4==== :
    - 增加数据包解析;
    - 增加tcp流表建立、查询、正常4次拆链删除;
    - 增加报文方向信息;
    - 增加特征组二;
2. ===8.5==== : 
    - 增加流表老化机制;
    - 修复hash table bug;
    - 修改dpdk18.02版本hash table 增加计算表中有效记录函数;
    - 整合特征组2;
    - 增加整合输出模块;
    - 合入特征组1,未整合;
3. ===8.6==== :
    - 整合特征组1;
    - 合入特征组3,整合特征组3
    - 集成测试:修正mbuf下标错误越界问题;修正数据包异常导致程序异常问题;修正时间戳精度问题;
4. ===8.7===== : 
    - 集成测试:
    - 修改多线程分别写文件导致Program terminated with signal 11, Segmentation fault问题---->修改为多线程写同一个文件;
    - 修改特征组1,流上单包统计问题;
5. ===8.8==== :
    - 打包docker镜像;
6. ===8.9==== :
    - 根据需求方提出需要在结果文件中增加最后一列标注每个流所属pcap文件
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