Send and receive IP packets.

[Israel P�rez]

If I want to send (and receive) a packet through IP (without TCP or UDP),

  1. Is good to use SOCK_RAW?

 

Code example I use (send):

{

   s = socket(AF_INET, SOCK_RAW,255);

   ip = (struct iphdr *) buf;
   ip->ihl=5; ip->version=4;
   ip->tos=0; ip->frag_off=0;
   ip->tot_len=(pLen+20)*16;
   ip->ttl=64; ip->protocol=255;
 
   dpdir = gethostbyname( daddr );          /* Remote IP address */
   bcopy(dpdir->h_addr,  &ip->daddr, dpdir->h_length);
   Dir.sin_family=AF_INET;
   Dir.sin_port=0;
   bcopy(dpdir->h_addr,  &Dir.sin_addr, dpdir->h_length); 
   sendto(s, buf,pLen+20,0,(struct sockaddr *)&Dir,sizeof(Dir));

}

 

Example Code (receive):

{

 s = socket(AF_INET, SOCK_RAW,255);

 recv(s,pack,*pLen,0);:

}

 

The problem of using SOCK_RAW is the necessity of put a protocol number (I use 255), and when I want to receive any IP packet, only the packets with this protocol number are received.

 

Anyone knows a solution for receive all IP packets?

 

Thanks for all,

   Isra