@lay:4471l1

Listing 1. Establishing an X.25 Connection: Call set up

/* Secure socket is created using a standard socket call. */
sock = socket( AF_WANPIPE, SOCK_RAW, 0);
if( sock < 0 ) {
perror("Socket");
return 1;
}

/* Fill in the binding information:
* - Socket type = AF_WANPIPE  (default)
* - Socket protocol = X25_PROT (default)
* - Connect device = svc_connect (default)
* - Card Name = wanpipe#  (#=1,2,3...): obtained from command line
* arguments.
*/
sa.sll_family = AF_WANPIPE;
sa.sll_protocol = htons(X25_PROT);
strcpy(sa.sll_device, "svc_connect");
strcpy(sa.sll_card, i_name);

/* Bind a sock to the WANPIPE driver using the above address structure
 * */
if(bind(sock, (struct sockaddr *)&sa, sizeof(struct wan_sockaddr_ll)) ==
-1){
perror("bind");
printf("Failed to bind socket to %s interface\n",i_name);
close(sock);
exit(0);
}

        /* Reset the API command structure: used to pass commands and
         * protocol specific
*  information to the socket */
        memset(&api_cmd, 0, sizeof(x25api_t));

/* Initialize the command structure with x,25 call data.  The call data
 * will be used to establish an x25 connection with the remote server.
 * Note: -u  data must be have even number of characters.
 *           -f  field cannot be set to zero (i.e. -f0)
 *           Refer to x.25.pdf hardware manual.
 */
        sprintf(api_cmd.data,"-d4172625101970 -s41101190 -uC700000054999400");
        api_cmd.hdr.length = strlen(api_cmd.data);

/* Send the call data to the socket.   This must be done before
 * the connect system call is performed to establish connection  */
        if ((err=ioctl(sock,SIOC_WANPIPE_SET_CALL_DATA,&api_cmd)) != 0){
                printf ("Setting call data Failed\n");
                close(sock);                             
                exit(1);
        }else{
                printf("Set Call Data OK\n");
        }

/* We are ready to place a call. The address
 * structure is optional. The sa structure will contain
 * a network interface name on which the connection was established */

        if (connect(sock, (struct sockaddr *)&sa, len) == 0){
                printf("Connection Successful\n");
        }else{
                printf("Connection Failed\n");
                close(sock);
                return 0;
        }

/* Determine the lcn/ channel, through which we established connection.
 * Data will be returned in the API command structure */

        if ((err=ioctl(sock,SIOC_WANPIPE_GET_CALL_DATA,&api_cmd)) != 0){
                printf ("Failed to obtain connection information\n");
                exit(1);
        }else{
                printf("Call Established on LCN %i\n",api_cmd.hdr.lcn);
        }