hi list,
i'm using kernel 2.2.14 and configured the bridge into the kernel.
i wrote a piece of code to detect any packets send out by the
bridge. every second, the bridge would send out a packet. however, my code
could not detect these packets. however, if i run tcpdump on the same
machine on which my code is ran, the code works fine. attached below is
the code. did i miss out anything?
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/if_packet.h>
#include <linux/supplicant.h>
#include<linux/if_ether.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <linux/sockios.h>
#include <arpa/inet.h>
#include <errno.h>
unsigned char buf[10002]={128};
void print_head (void)
{
printf("HW-ADDR: %.2x:%.2x:%.2x:%.2x:%.2x:%.2x -----> %.2x:%.2x:%.2x:%.2x:%.2x:%.2x
\n",
buf[6],buf[7],buf[8],buf[9],buf[10],buf[11],
buf[0],buf[1],buf[2],buf[3],buf[4],buf[5]);
}
main(int argc, char **argv)
{
int sockid;
int counter = 0;
if ( (sockid = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)) ) < 0)
{
printf("%s: socket failed: %d\n", argv[0], errno);
exit(-1);
} else printf("sock is %d\n",sockid);
for(;;)
{
printf("i'm waiting...\n");
recv(sockid,buf,10000,0);
printf("message %d: ", counter);
print_head();
counter++;
printf("\n\n");
}
close(sockid);
}
Nelson
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"You will never walk alone"
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