linux C编程获取指定网卡网络数据包并分析(附C语言源码)

[cpp]
#include <stdio.h>
#include <pcap.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main(){
    char *net_dev;
    char *ip_addr;
    char *net_mask;
    char errbuf[PCAP_ERRBUF_SIZE];

    bpf_u_int32 netp;
    bpf_u_int32 mask;
    struct in_addr addr;

    net_dev = pcap_lookupdev(errbuf);
    if(net_dev == NULL){
        printf("cannot get the network device info: %s\n", errbuf);
        return 1;
    }

    printf("the network device is : %s\n", net_dev);
    if(pcap_lookupnet("any", &netp, &mask, errbuf) == -1){
        printf("error\n");
        return 1;
    }

    addr.s_addr = netp;
    ip_addr = inet_ntoa(addr);

    if(ip_addr == NULL){
        printf("inet_ntoa()\n");
        return 1;
    }

    printf("ip is %s\n", ip_addr);

    addr.s_addr = mask;
    net_mask = inet_ntoa(addr);
    if(net_mask == NULL){
        perror("inet_ntoa();\n");
        return 1;
    }

    printf("mask is %s\n", net_mask);

    return 0;
}
#include <stdio.h>
#include <pcap.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main(){
char *net_dev;
char *ip_addr;
char *net_mask;
char errbuf[PCAP_ERRBUF_SIZE];

bpf_u_int32 netp;
bpf_u_int32 mask;
struct in_addr addr;

net_dev = pcap_lookupdev(errbuf);
if(net_dev == NULL){
  printf("cannot get the network device info: %s\n", errbuf);
  return 1;
}

printf("the network device is : %s\n", net_dev);
if(pcap_lookupnet("any", &netp, &mask, errbuf) == -1){
  printf("error\n");
  return 1;
}

addr.s_addr = netp;
ip_addr = inet_ntoa(addr);

if(ip_addr == NULL){
printf("inet_ntoa()\n");
return 1;
}

printf("ip is %s\n", ip_addr);

addr.s_addr = mask;
net_mask = inet_ntoa(addr);
if(net_mask == NULL){
perror("inet_ntoa();\n");
return 1;
}

printf("mask is %s\n", net_mask);

return 0;
}

本程序可以自动获取电脑上面的网卡名称，然后可以得到所获取网卡的ip地址以及mask掩码。

[cpp]
#include <stdio.h>
#include <pcap.h>
#include <netinet/if_ether.h>

int main(){
    pcap_t *sniffer_des;
    char errbuf[PCAP_ERRBUF_SIZE];
    char *net_dev;
    bpf_u_int32 net, mask;
    struct bpf_program fp;
    const u_char *packet;
    struct pcap_pkthdr hdr;
    struct ether_header *eth_header;
    u_char *ptr;

    char filter[] = "port 80";

    net_dev = pcap_lookupdev(errbuf);
    if(net_dev == NULL){
        printf("get device error:%s\n", errbuf);
        return 1;
    }
    net_dev = "p3p1";
    if(pcap_lookupnet(net_dev, &net, &mask, errbuf) == -1){
        printf("get net error:%s\n", errbuf);
        return 1;
    }

    sniffer_des = pcap_open_live(net_dev, 65535, 1, 5000, errbuf);
    if(sniffer_des == NULL){
        printf("pcap_open_live%s\n", errbuf);
        return 1;
    }

    if(pcap_compile(sniffer_des, &fp, filter, 0, mask) == -1){
        printf("pcap_compile error\n");
        return 1;
    }

    if(pcap_setfilter(sniffer_des, &fp) == -1){
        printf("pcap_setfilter() error\n");
        return 1;
    }

    packet = pcap_next(sniffer_des, &hdr);
    if(packet == NULL){
        printf("pacap_next() failed\n");
        return 1;
    }

    printf("Packet length %d\n", hdr.len);
    printf("Sniffer time: %s\n", ctime((const time_t*)&hdr.ts.tv_sec));
    printf("length of portion present: %d\n", hdr.caplen);

    eth_header = (struct ether_header*)packet;
    if(ntohs(eth_header->ether_type) != ETHERTYPE_IP){
        printf("not ethernet packet\n");
        return 1;
    }

    ptr = eth_header->ether_dhost;
    int i = 0;
    printf("destination address(MAC):");
    while(i < ETHER_ADDR_LEN){
        printf(" %x", *ptr++);
        i++;
    }

    printf("\nsource address(MAC):");
    ptr = eth_header-&

补充：综合编程 , 其他综合 ,