On Wed, 28 Nov 2001 17:49:54 +0530
"chakri" <chakraa@future.futsoft.com> wrote:
> Hi,
>
> I have a machine with multiple NICs supported.
> I am trying to capture packets using the PACKET_SOCKET directly on the
> Ethernet.
> It is observed that recvfrom () captures packets received on all the
NICs
> supported in the host.
> I do have a mechanism of sorting the packets based on NIC (using sa_addr
> member of sockaddr structure). But how do I capture only those packets
> coming on a specific NIC (say eth1). Is there a way wherein I specify to
> receive packets coming at a particular interface only?
int openintf(char *d)
{
int fd;
struct ifreq ifr;
int s;
fd=socket(AF_INET, SOCK_PACKET, htons(0x800));
if(fd < 0)
{
perror("cant get SOCK_PACKET socket");
exit(0);
}
strcpy(ifr.ifr_name, d);
s=ioctl(fd, SIOCGIFFLAGS, &ifr);
if(s < 0)
{
close(fd);
perror("cant get
flags");
exit(0);
}
ifr.ifr_flags |= IFF_PROMISC;
s=ioctl(fd, SIOCSIFFLAGS, &ifr);
if(s < 0)
perror("cant set promiscuous mode");
return fd;
}
May be it is what you want?
Parameter for openintf() must be the name of an interface to open, t.e.
for example "eth1".
And after it you can read()/write() from/to obtained socket.
>
> Re,
> Chuks
---
WBR. //s0mbre
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