65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
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#include "cw.h"
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#include "dbg.h"
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/**
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* @brief Process a CAPWAP message element
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* @param conn
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* @param msgdata
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* @param handler
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* @param elems_ptr
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* @param elems_len
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* @return Result Code as defined in RFC5415
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*/
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int cw_process_element(struct cw_ElemHandlerParams *params, int proto, int vendor,int elem_id,
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uint8_t * data, int len){
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struct cw_ElemHandler * handler;
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struct cw_ElemData * elem_data, elem_data_search;
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/* try to retrieve a handler for this message element */
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handler = cw_msgset_get_elemhandler(params->conn->msgset,0, 0, elem_id);
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if (!handler) {
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cw_dbg(DBG_ELEM_ERR, "Unrecognized message element: %d, ignoring",
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elem_id);
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return CAPWAP_RESULT_UNRECOGNIZED_MESSAGE_ELEMENT;
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}
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/* check if this message element in the current message allowed */
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elem_data_search.id=elem_id;
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elem_data_search.proto=0;
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elem_data_search.vendor=0;
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elem_data = mavl_find(params->msgdata->elements_tree,&elem_data_search);
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if (!elem_data){
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cw_dbg(DBG_ELEM_ERR, "Element %d - %s, not allowed here",
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elem_id, handler->name);
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return CAPWAP_RESULT_UNRECOGNIZED_MESSAGE_ELEMENT;
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}
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if (elem_data->mand){
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mavl_add_str(params->mand_found,handler->key);
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}
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/* check the length of the message */
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if (len < handler->min_len) {
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cw_dbg(DBG_ELEM_ERR,
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"%d (%s) message element too short, len=%d, min len=%d",
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handler->id, handler->name, len,
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handler->min_len);
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return -1;
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}
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if (len > handler->max_len && handler->max_len) {
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cw_dbg(DBG_ELEM_ERR,
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"%d (%s) message element too big, len=%d, max len=%d", handler->id,
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handler->name, len, handler->max_len);
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/* TODO XXX truncate the element instead of return */
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return -1;
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}
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cw_dbg_elem(DBG_ELEM, params->conn, params->msgdata->type, handler,
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data,len);
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return handler->get(handler, params, data, len);
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}
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