Re: sending raw packet using pcap

["Chris sun" <lei_sun () comcast net>]

Here is the function I added for sending packet through pcap :
int pcap_write_linux(pcap_t *pd, unsigned char *buf, int count)
{
        int i;
        struct sockaddr_ll sa;
        sa.sll_family = PF_PACKET;
        sa.sll_protocol = htons(ETH_P_ALL);
        sa.sll_ifindex =  iface_get_id(pd->fd, pd->md.device, pd->errbuf);

        i = sendto(pd->fd, buf, count, 0, &sa, (socklen_t)sizeof(struct
sockaddr_ll));
        if (i != count){
                perror(pd->errbuf);
                return -1;
        }
        return i;
}

It did worked if i send packet slowly. But if i keep sending it without
putting some sleep code, error occured,
the error message is :
  No Buffer space available.
The man page of sendto() tells me that linux will never return ENOBUFS ,
packets are just
 silently dropped when a device queue overflows.
Besides, I think the pd-> fd is  a blocking socket, it will block if buffer
is full instead of returnning error, right ?

Any idea ?
Thank you
chris

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