[ARP Spoofing] 1-2. Find victims (updated)

/***************
*    Author : 5kyc1ad
*    2016.03.20 : 01:30
*    Update
*       - 2016.03.22 : Input Bcast & Expand IP Range to send ARP
****************/
 
#include <tins/tins.h>
#include <thread>
#include <unistd.h>
#include <stdio.h>
#include <iostream>
#include <map>
#include <string>
#include <time.h>
 
using namespace std;
using namespace Tins;
 
void ARPsniffing(char *);
void sendARP(char *, char *);
 
int main(int argc, char *argv[])
{
    if(argc!=3) {
        cout << "[*] Usage : " << argv[0] << " [MY_IP] [BCAST]" << endl;
        return 1;
    }
    thread sniffThread(ARPsniffing, argv[1]);
    sleep(1);
    thread sendingARPThread(sendARP, argv[1], argv[2]);
 
    sendingARPThread.join();
    sniffThread.join();
    return 0;
}
 
void ARPsniffing(char *my_ip){
    map<IPv4Address, HWAddress<6>> mac_list;
    int TIMEOUT = 20;
    char config[256] = {0,};
    Sniffer sniff("wlan0");
    sprintf(config, "arp dest %s", my_ip);
    cout << "[*] Configure : Filtering=" << config << ", TIMEOUT="<< TIMEOUT << endl;
    sniff.set_filter(config);
    int cur = time(NULL);
    while(time(NULL) < cur + TIMEOUT) {
        Packet p = sniff.next_packet();
        if(p.pdu()->find_pdu<ARP>() && p.pdu()->rfind_pdu<ARP>().opcode() == 2) {
            mac_list.insert(pair<IPv4Address, HWAddress<6>>(p.pdu()->rfind_pdu<ARP>().sender_ip_addr(), p.pdu()->rfind_pdu<ARP>().sender_hw_addr()));
        }
    }
    clog << "[*][*] Saved ip-mac Table [*][*]" << endl;
    for(map<IPv4Address, HWAddress<6>>::iterator i=mac_list.begin(); i != mac_list.end() ; i++) {
        clog << i->first << " : " << i->second << endl;
    }
}
 
void sendARP(char *my_ip, char *bcast){
    char tmp[30] = {0,};
    int ip1, ip2, ip3, ip4, net;
    PacketSender sender;
    sscanf(bcast, "%d.%d.%d.%d", &ip1, &ip2, &net, &ip4);
    sscanf(my_ip, "%d.%d.%d.%d", &ip1, &ip2, &ip3, &ip4);
    ip4 = 0;
 
    for(int j=0; j<=net; j++){
        for(int i=0; i<=255; i++){
            sprintf(tmp, "%d.%d.%d.%d", ip1, ip2, j, i);
            IPv4Address to_resolve(tmp);
            NetworkInterface iface(to_resolve);
            auto info = iface.addresses();
            EthernetII eth = ARP::make_arp_request(to_resolve, info.ip_addr, info.hw_addr);
            sender.send(eth, iface);
            usleep(10000);
            clog << "[*] ARP Request to " << tmp << endl;
        }
    }
}