Dlpi Example Program

LLA and DLPI Example Programs

char *rdlsap;

int msg_res;

msg_res = get_msg(fd); check_ctrl(DL_UNITDATA_IND); if(msg_res != GOT_BOTH) {

printf(”error: did not receive data part of message\n”); exit(1);

}

return(data_buf.len);

}

/********************************************************************* send a data packet; assumes data_area has already been filled in

*********************************************************************/

void

send_data(fd, rdlsap, rdlsap_len, len)

int	fd;	/* file descriptor */
u_char*	rdlsap;/* remote dlsap */
int	rdlsap_len;/* length		of rdlsap */
int	len;/* length of the		packet to send */
{
dl_unitdata_req_t *data_req =			(dl_unitdata_req_t *)ctrl_area;
u_char*out_dlsap;

/* fill in data_req */

data_req->dl_primitive = DL_UNITDATA_REQ; data_req->dl_dest_addr_length = rdlsap_len; data_req->dl_dest_addr_offset = sizeof(dl_unitdata_req_t); /* copy dlsap */

out_dlsap = (u_char *)ctrl_area + sizeof(dl_unitdata_req_t); memcpy(out_dlsap, rdlsap, rdlsap_len);

put_both(fd, sizeof(dl_unitdata_req_t) + rdlsap_len, len, 0);

}

/********************************************************************* print a string followed by a DLSAP

*********************************************************************/

void

print_dlsap(string, dlsap, dlsap_len)

char	*string;	/* label */
u_char	*dlsap;	/* the DLSAP */
int	dlsap_len;	/* length of dlsap */
{
int	i;

printf(”%s”, string);

for(i = 0; i < dlsap_len; i++) { printf(”%02x”, dlsap[i]);

}

printf(”\n”);

}

Chapter 2