bindp revision

int bind (int fd, const struct sockaddr *sk, socklen_t sl){
    int debug_enabled = 1 ;
    /*
        As defined in linux/socket.h ,__kernel_sa_family_t is 2 bytes wide.
        We read the first two bytes of sk without using cast to protocol families

    */

    unsigned short _pf = *((unsigned short*) sk);
    switch (_pf){
    case AF_INET:
    {
        static struct sockaddr_in *lsk_in;

        lsk_in = (struct sockaddr_in *)sk;

        if (debug_enabled){
            char original_ip [INET_ADDRSTRLEN];
            inet_ntop(AF_INET,&(lsk_in->sin_addr),original_ip,INET_ADDRSTRLEN);
            int original_port = ntohs(lsk_in->sin_port);
            char *l_bind_addr = getenv ("BIND_ADDR");
            char *l_bind_port = getenv ("BIND_PORT");
            printf("[-] LIB received AF_INET bind request\n");
            if (l_bind_addr && l_bind_port){
                printf("[-] Changing %s:%d to %s:%s\n" , original_ip,original_port,l_bind_addr,l_bind_port);
            }else{
                printf("[!] AF_INET: Leaving request unchanged\n");
            }
        }


        if(bind_addr_saddr)
            lsk_in->sin_addr.s_addr = bind_addr_saddr;

        if (bind_port_saddr)
            lsk_in->sin_port = htons (bind_port_saddr);

    }
        break;
    case AF_UNIX:
        printf("[-] LIB received AF_UNIX bind request\n");
        printf("[-] AF_UNIX: Leaving request unchanged\n");
        break;

    /*
        Other families handling

    */

    default:

        break;

    }



    /*
        FIXME: Be careful when using setsockopt
        Is it valid to use these options for AF_UNIX?
        Must be checked

    */
    if (reuse_addr){
        setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse_addr, sizeof(reuse_addr));
    }

#ifdef SO_REUSEPORT
    if (reuse_port){
        setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &reuse_port, sizeof(reuse_port));
    }
#endif

    if (ip_transparent){
        int opt =1;
        setsockopt(fd, SOL_IP, IP_TRANSPARENT, &ip_transparent, sizeof(ip_transparent));
    }

    return real_bind (fd, sk, sl);
}