Hallo,
I write a small program in order to catch all packet
at the physical layer (see below). I have the problem
that i cannot see the contain of packet that i caugth.
The printf() function returns the same Hex data.
Can someone tell me how can i catch all the all packet
and how can i examine the contain of the packet i've
caugth ?
include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <linux/if_packet.h>
#include <linux/if_ether.h>
#include <features.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
int main(int argc, char **argv)
{
int sockfd;
char buffer[1024];
struct sockaddr_in from;
int length, recv_ret;
if ((sockfd = socket(PF_PACKET, SOCK_DGRAM,
htons(ETH_P_ALL))) < 0)
{
perror("socket");
exit(-1);
}
while ((recv_ret = recvfrom(sockfd, (void *)buffer,
sizeof(buffer), 0, (struct sockaddr *)0, 0)) >= 0)
{
if (recv_ret == 0)
printf("The last packet \n");
printf("recv_ret = %d\n", recv_ret) ;
printf("%x\n", (char *)buffer);
}
if (recv_ret < 0) {
perror("recvfrom");
exit(-1);
}
return 0;
}
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