13 十二章分布式数据包抓取系统 libpcap的安装与使用

1. libpcap 的下载



  解压： ywx@ywx:~/yu$ tar zxfv libpcap-1.1.1.tar.gz

2. ./configure 配置文件
   make
   make install
  注意在./configure 过程中有错误，安装
    apt-get install flex

  默认安装在了/usr/下
  最后安装在了 /usr/local/lib/libpcap.so


3. 代码编写：

  代码附件： testlibcap.rar  

#include <stdio.h>
#include <stdlib.h>
#include <pcap.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main(int argc, char *argv[])
{
    char *dev;
    char *net;
    char *mask;
    int ret;
    char errbuf[PCAP_ERRBUF_SIZE];
    bpf_u_int32 netp;
    bpf_u_int32 maskp;
    struct in_addr addr;
    dev = pcap_lookupdev(errbuf);
    if(dev == NULL)
    {
        printf("%s\n",errbuf);
        exit(1);
    }
    printf("device name is :%s\n",dev);
    ret =pcap_lookupnet(dev, &netp, &maskp, errbuf);
    if(ret == -1)
    {
        printf("%s\n",errbuf);
        exit(1);
    }
    addr.s_addr =netp;
    net = inet_ntoa(addr);
    if(net == NULL)
    {
        perror("inet_ntoa");
        exit(1);
    }

    printf("IP address:%s\n",net);
    addr.s_addr = maskp;
    mask = inet_ntoa(addr);
    if(mask ==NULL)
    {
        perror("inet_ntoa");
        exit(1);
    }
    printf("wangluo yanma:%s\n",mask);

    exit(EXIT_SUCCESS);

}

4.编译运行

应该需要设置环境变量，
root@ywx:/home/ywx/yu/libpcap# ln -s /usr/local/lib/libpcap.so.1 /usr/lib/

root@ywx:/home/ywx/yu/libpcap# gcc -o testlibcap testlibcap.c -lpcap
root@ywx:/home/ywx/yu/libpcap# ./testlibcap
device name is :eth0
IP address:192.168.244.0
wangluo yanma:255.255.255.0