从pcap文件中读数据并组播

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已于 2022-05-12 16:44:27 修改

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分类专栏：网络 Linux C++ 文章标签： udp pcap 组播

于 2021-09-03 09:49:22 首次发布

本文链接：https://blog.youkuaiyun.com/photon222/article/details/120074973

本文介绍如何从pcap文件中提取数据，并详细阐述了如何利用这些数据进行UDP组播操作，参考了https://www.tenouk.com/Module41c.html的相关教程。

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>

#define UDP_DEST_PORT 30000
#define UDP_LOCAL_PORT 30000
#define MAX_LINE 1024
//#define SEND_NUM            10
unsigned match_udp(FILE*, int, unsigned char*, long*);
int      dataSend(unsigned char*, long, const char*, int);

const char* ipDst = "239.100.0.100";
typedef struct pcap_pkt_header_t
{
   
   
    // struct   time_val   ts;           /* time stamp */
    int          wSecond;       /* seconds ????? time_t ?????? */
    int          wMicroseconds; /* and microseconds */
    unsigned int uwcaplen;      /* length of portion present */
    unsigned int uwlen;         /* length this packet (off wire) */
} __attribute__((packed)) pcap_pkt_header_t;
// MAC_HEAD_STRUCT
typedef struct mac_header_t
{
   
   
    unsigned char  ucaDstMAC[6]; //
    unsigned char  ucaSrcMAC[6]; //
    unsigned short usFrameType;  //
} __attribute__((packed)) mac_header_t;

// IP_PACKET_HEAD
typedef struct ip_header_t
{
   
   
    unsigned char  ucVer_HLen;     //
    unsigned char  ucTOS;          //
    unsigned short usTotalLen;     //
    unsigned short usID;           //
    unsigned short usFlag_Segment; //
    unsigned char  ucTTL;          //
    unsigned char  ucProtocol;     //
    unsigned short usChecksum;     //
    unsigned int   uwSrcIP;        //
    unsigned int   uwDstIP;        //
} __attribute__((packed)) ip_header_t;

// UDP HEADER
typedef struct udp_header_t
{
   
                                 // UDP
    unsigned short usSrcPort;  //
    unsigned short usDstPort;  //
    unsigned short usDataLen;  //
    unsigned short usChecksum; //