winpcap学习（三）

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//发送数据包
 bool SendPacket()    {        pcap_if_t* allAdapters = NULL; // 适配器列表        pcap_if_t* pAdapter = NULL;        pcap_t* adapterHandle = NULL;        u_char packet[20]; //发送数据包        char errorBuffer[PCAP_ERRBUF_SIZE+1] = {"0"};                if(pcap_findalldevs_ex(PCAP_SRC_IF_STRING,NULL,&allAdapters,errorBuffer) == -1)        {            fprintf(stderr,"non't excute pcap_findalldevs_ex，errorInfo:%s",errorBuffer);            return -1;        }        if(allAdapters == NULL)        {            fprintf(stderr," not find the adapter for use!");            pcap_freealldevs(allAdapters);            return 0;        }        int crtAdapter = 0;        for(pAdapter = allAdapters; pAdapter;pAdapter = pAdapter->next)        {            printf("\nthe interface %d:%s",++crtAdapter,pAdapter->name);            printf("\n---%s",pAdapter->description);        }        // 选择适配器        int nadapterNum = 0;        printf(" Enter the number of adapter which you want to send packet!");        scanf("%d",&nadapterNum);        // 搜索接口        if( nadapterNum < 1 || nadapterNum > crtAdapter )        {            printf( "\nAdapter number out of range.\n" );            // 释放适配器列表            pcap_freealldevs( allAdapters );            return -1;        }        pAdapter = allAdapters;        for( crtAdapter = 0; crtAdapter < nadapterNum - 1; crtAdapter++ )            pAdapter = pAdapter->next;        // 打开指定适配器        adapterHandle = pcap_open( pAdapter->name, // name of the adapter            65536,         // portion of the packet to capture            // 65536 guarantees that the whole             // packet will be captured            PCAP_OPENFLAG_PROMISCUOUS, // promiscuous mode            1000,             // read timeout - 1 millisecond            NULL,          // authentication on the remote machine            errorBuffer    // error buffer            );        if( adapterHandle == NULL )        {//指定适配器打开失败            fprintf( stderr, "\nUnable to open the adapter\n", pAdapter->name );            // 释放适配器列表            pcap_freealldevs( allAdapters );            return -1;        }        pcap_freealldevs( allAdapters );//释放适配器列表        //创建数据封包        // 设置目标的MAC地址为01 : 01 : 01 : 01 : 01 : 01        packet[0] = 0x01;        packet[1] = 0x01;        packet[2] = 0x01;        packet[3] = 0x01;        packet[4] = 0x01;        packet[5] = 0x01;        // 设置源的MAC地址为02 : 02 : 02 : 02 : 02 : 02        packet[6]  = 0x02;        packet[7]  = 0x02;        packet[8]  = 0x02;        packet[9]  = 0x02;        packet[10] = 0x02;        packet[11] = 0x02;        // 设置封包其他部分内容        for( int index = 12; index < 20; index++ )        {            packet[index] = 0xC4;        }        //发送数据封包        if( pcap_sendpacket( adapterHandle, // the adapter handle            packet, // the packet            20 // the length of the packet            ) != 0 )        {            fprintf( stderr,"\nError sending the packet: \n", pcap_geterr( adapterHandle ) );            return -1;        }       return 0;    }
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