winpcap ARP请求代码

#include "network.h"
#include <iostream>
#include <string>
#include <vector>
#include "pcap.h"
#include <ntddndis.h>
#include "packet32.h"
using namespace std;
struct packet_t{
	ethhdr eth;
	arphdr arp;
	u_char pad[18];
};
int
	main(int argc, char **argv)
{
	pcap_t *fp;
	char errbuf[PCAP_ERRBUF_SIZE];
	string str;
	vector<string> v;
	packet_t packet;
	int i = 0;
	pcap_if_t *alldevs;
	pcap_if_t *d;
	/* Retrieve the device list from the local machine */
	if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL /* auth is not needed */, &alldevs, errbuf) == -1)
	{
		fprintf(stderr,"Error in pcap_findalldevs_ex: %s\n", errbuf);
		exit(1);
	}
	cout<<sizeof(packet_t)<<endl;
	/* Print the list */
	for(d= alldevs; d != NULL; d= d->next)
	{
		printf("%d. %s", ++i, d->name);
		str = d->name;
		v.push_back(str);
		if(d->description)
			printf(" (%s)\n", d->description);
		else
			printf(" (No description available)\n");
	}

	if (i == 0)
	{
		printf("\nNo interfaces found! Make sure WinPcap is installed.\n");
		return 1;
	}

	/* We don't need any more the device list. Free it */
	pcap_freealldevs(alldevs);
	
	printf("%s..\n",mac_to_string(get_dev_mac(v[0].c_str()),errbuf));
	/* Open the output device */
	if ( (fp= pcap_open(v[0].c_str(),         
		100,                // portion of the packet to capture (only the first 100 bytes)
		PCAP_OPENFLAG_PROMISCUOUS,  // promiscuous mode
		1000,               // read timeout
		NULL,               // authentication on the remote machine
		errbuf              // error buffer
		) ) == NULL)
	{
		fprintf(stderr,"\nUnable to open the adapter. %s is not supported by WinPcap\n", argv[1]);
		return 1;
	}
	/* Send down the packet */
	memset(&packet,0,sizeof packet_t);
	memset(&packet.eth.h_dest,0xFF,ETH_ALEN);
	memcpy(&packet.eth.h_source,get_dev_mac(v[0].c_str()),ETH_ALEN);
	//上层协议为ARP协议，0x0806
	packet.eth.h_proto = htons(ETH_P_ARP);

	//硬件类型，Ethernet是0x0001
	packet.arp.ar_hrd = htons(ARPHRD_ETHER);
	//上层协议类型，IP为0x0800
	packet.arp.ar_pro = htons(ETH_P_IP);
	//硬件地址长度：MAC地址长度为0x06
	packet.arp.ar_hln = 6;
	//协议地址长度：IP地址长度为0x04
	packet.arp.ar_pln = 4;
	//操作：ARP请求为1
	packet.arp.ar_op = htons(ARPOP_REQUEST);
	//源端
	memcpy(packet.arp.ar_sha,get_dev_mac(v[0].c_str()),ETH_ALEN);
	u_long sip = inet_addr("125.217.40.219");
	memcpy(packet.arp.ar_sip,&sip,sizeof(u_long));
	//目标
	memset(packet.arp.ar_tha,0,ETH_ALEN);
	u_long tip = inet_addr("125.217.40.254");
	memcpy(packet.arp.ar_tip,&tip,sizeof(u_long));
	L:
	if (pcap_sendpacket(fp, (u_char*)&packet, sizeof packet_t /* size */) != 0)
	{
		fprintf(stderr,"\nError sending the packet: %s\n", pcap_geterr(fp));
		
		return 1;
	}
	goto L;
	return 0;
}