hi
I am trying to route the packets comming to any of my
interfaces according to their destination(ip
forwarding)using C on linux. What i am doing is
creating a socket, binding it to all interfaces and
then reading the pkt destination ip and accordingly
forwarding the pkt to the appropriate interface using
sendto().
What is happening is: when i ping from one
machine(151.2.123.85) to another (192.168.1.1), it
shows requyest timed out. The application is showing
me that the pkt has been sent to 192 interface. I
assume that somehow pkt is not sent from interface to
the destination machine as i am not getting any reply
pkt from 192.168.1.1.
What can be the problem?? What can be the
solution???How shall i proceed???
The code is below:
s1=socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
bzero((char *)&sock_add,sizeof(sock_add));
sock_add.sin_family=AF_INET;
sock_add.sin_addr.s_addr= htonl(INADDR_ANY);
sock_add.sin_port=htons(0);
if(bind(s1,(struct sockaddr *)&sock_add,
sizeof(sock_add)) < 0)
printf("Could not bind");
bzero((char *)&so_ad,sizeof(so_ad));
so_ad.sin_family=AF_INET;
so_ad.sin_port=htons(0);
if(check_ip("151.2.*.*",dest)==1){
inet_aton("151.2.123.75", &(so_ad.sin_addr));
i=1;
}
else if(check_ip("192.168.1.*",dest)==1)
{
inet_aton("192.168.1.2", &(so_ad.sin_addr));
printf("\n interface 2 matched");
i=2;
}
sendto(s1, buffer, sizeof(buffer),0,(struct sockaddr
*) &so_ad , sizeof(so_ad));
regrds,
Paridhi
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