Very Computer

Hi,
    I have one question about RAW socket in Suse Linux 2.2.11. In
following my C program code I want reading TCP message with RAW socket
(I now it is not correct)

/*-------  serv.c ---------*/
int main(void)
{
    int sockfd, n, servlen;
    char buf]1028];
    struct sockaddr_in serv;

    if((sockfd=socket(AF_INET, RAW_SOCK, IPPROTO_TCP))<0) {
        perror("Open socket error\n");
        return -1;
    }

    while(1) {
        if((n=recvfrom(sockfd, buf, 1028, 0, (struct sockaddr *) &serv,
servlen))<0) {
            perror("recvfrom error\n");
            return -2;
        }
    }

    if(sockfd) close(sockfd);
    return 0;

Quote:}

Now, the my question is, if IP layer (in /net/ipv4/ip_input.c file
ip_local_deliver() function) receive packet from Ethernet, and check all

RAW socket before deliver packet to highter layer. If the function check

RAW socket, return value is not NULL, but I don't read anything with
socket, and with TCP socket I can read it.
How do "ip_local_deliver" function work? How do I know read TCP message
with RAW socket?
    I did it with FreeBSD OS, but in Linux it is difficult, because I
have not any books (not TCP/IP Illustrataed by R. Stevens).

Thank very much.
    Hung