actube/src/cw/cw_process_element.c

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#include "cw.h"
#include "dbg.h"
#include "log.h"
/**
* @brief Process a CAPWAP message element
* @param conn
* @param msgdata
* @param handler
* @param elems_ptr
* @param elems_len
* @return Result Code as defined in RFC5415
*/
int cw_process_element(struct cw_ElemHandlerParams *params, int proto, int vendor,int elem_id,
uint8_t * data, int len){
struct cw_ElemHandler * handler;
struct cw_ElemData * elem_data, elem_data_search;
int rc;
params->elem=NULL;
/* try to retrieve a handler for this message element */
handler = cw_msgset_get_elemhandler(params->conn->msgset,proto, vendor, elem_id);
if (!handler) {
cw_dbg(DBG_ELEM_ERR, "Unrecognized message element: %d, ignoring",
elem_id);
return CAPWAP_RESULT_UNRECOGNIZED_MESSAGE_ELEMENT;
}
/* check if this message element in the current message allowed */
elem_data_search.id=elem_id;
elem_data_search.proto=proto;
elem_data_search.vendor=vendor;
elem_data = mavl_find(params->msgdata->elements_tree,&elem_data_search);
if (!elem_data){
cw_dbg(DBG_ELEM_ERR, "Element %d - %s, not allowed here",
elem_id, handler->name);
return CAPWAP_RESULT_UNRECOGNIZED_MESSAGE_ELEMENT;
}
/* check the length of the message */
if (len < handler->min_len) {
cw_dbg(DBG_ELEM_ERR,
"%d (%s) message element too short, len=%d, min len=%d",
handler->id, handler->name, len,
handler->min_len);
return -1;
}
if (elem_data->mand){
mavl_add_str(params->mand_found,handler->key);
}
if (len > handler->max_len && handler->max_len) {
cw_dbg(DBG_ELEM_ERR,
"%d (%s) message element too big, len=%d, max len=%d", handler->id,
handler->name, len, handler->max_len);
/* TODO XXX truncate the element instead of return */
return -1;
}
cw_dbg_elem(DBG_ELEM_IN, params->conn, params->msgdata->type, handler,
data,len);
if (handler->get == NULL){
cw_log(LOG_ERR,"No get method defined for %d %s",handler->id,handler->name);
return CAPWAP_RESULT_UNRECOGNIZED_MESSAGE_ELEMENT;
}
rc = handler->get(handler, params, data, len);
return rc;
}