hi, i've a code shown like this..
#include <stdlib.h>
#include <stdio.h>
#include <winsock2.h>
#include <pcap.h>
#include <remote-ext.h>
#define ETH_IP 0x0800 // type: IP
#define ETH_ARP 0x0806 // type: ARP
#define ETH_ICMP 0x0800 // type: ICMP = IP
#define ARP_HARDWARE 0x0001 // type for 802.3 frames
#define ARP_REQUEST 0x0001 // ARP request
#define ARP_REPLY 0x0002 // ARP reply
typedef struct eth_header{
u_char eth_dst[6];
u_char eth_src[6];
u_short eth_type;
}ETH_HEADER;
typedef struct arp_header{
u_short arp_htype;
u_short arp_ptype;
u_char arp_hlen;
u_char arp_plen;
u_short arp_oper;
u_char arp_sha[6];
u_long arp_spa;
u_char arp_tha[6];
u_long arp_tpa;
}ARP_HEADER;
int main(){
pcap_if_t *alldevs;
pcap_if_t *d;
pcap_t *adhandle;
ETH_HEADER eth_header;
ARP_HEADER arp_header;
char errbuf[PCAP_ERRBUF_SIZE];
int inum;
int i = 0;
unsigned char src_mac[6] = {0x10,0x11, 0x11, 0x11, 0x11, 0x11};
unsigned char dst_mac[6] = {0x00,0xff, 0xff, 0x00, 0x00, 0x00};
u_char sendbuf[1024];
/* Retrieve the device list */
if (pcap_findalldevs(&alldevs, errbuf) == -1){
fprintf(stderr,"Error in pcap_findalldevs: %s\n", errbuf);
return -1;
}
/* Print the list */
for(d=alldevs; d; d=d->next){
printf("%d. %s", ++i, d->name);
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;
}
printf("Enter the interface number (1-%d):",i);
scanf("%d", &inum);
//inum = 3;
if(inum < 1 || inum > i){
printf("\nInterface number out of range.\n");
/* Free the device list */
pcap_freealldevs(alldevs);
return -1;
}
/* Jump to the selected adapter */
for(d=alldevs, i=0; i< inum-1 ;d=d->next, i++);
/* Open the adapter */
if ( (adhandle= pcap_open_live(d->name, // name of the device
65536, // portion of the packet to capture.
1, // promiscuous mode
1000, // read timeout
errbuf // error buffer
) ) == NULL){
fprintf(stderr,"\nUnable to open the adapter. %s is not supported by WinPcap\n");
/* Free the device list */
pcap_freealldevs(alldevs);
return -1;
}
// ARP
/* Fill in eth hdr */
memcpy(eth_header.eth_dst, dst_mac, 6);
memcpy(eth_header.eth_src, src_mac, 6);
eth_header.eth_type = htons(ETH_ARP);
/* Fill in arp hdr */
arp_header.arp_htype = htons(ARP_HARDWARE);
arp_header.arp_ptype = htons(ETH_IP);
arp_header.arp_hlen = 6;
arp_header.arp_plen = 4;
arp_header.arp_oper = htons(ARP_REQUEST);
memcpy(arp_header.arp_sha, src_mac, 6);
arp_header.arp_spa = htonl(inet_addr("192.168.0.1"));
memcpy(arp_header.arp_tha, dst_mac, 6);
arp_header.arp_tpa = htonl(inet_addr("192.168.0.2"));
memset(sendbuf,0,sizeof(sendbuf));
memcpy(sendbuf, ð_header, sizeof(eth_header));
memcpy(sendbuf + sizeof(eth_header), &arp_header, sizeof(arp_header));
/* Send down the packet */
if (pcap_sendpacket(adhandle, sendbuf,sizeof(eth_header)+sizeof(arp_header)) != 0){
fprintf(stderr,"\nError sending the packet: \n", pcap_geterr(adhandle));
return 0;
}
printf("\nSent ARP request\n");
return 0;
}Can anybody tell me why it keeps sending wrong ip address..
Any help will be greatly appreciated.. Thx..
