// Create a new session
// FIXME - This is currently open to a DoS attack.
// but since we have a session limit, just for opendias.
char *create_session() {
char *session_id;
// Check upper session count limit
int current_session_count = sll_count( sll_findFirstElement( sessions ) );
o_log( DEBUGM, "There are currently %d active sessions", current_session_count);
if( current_session_count > MAX_SESSIONS ) {
return NULL;
}
// Generate session key
uuid_t uu;
char *sid = malloc(36+1);
uuid_generate(uu);
uuid_unparse(uu, sid);
session_id = o_strdup(sid);
free(sid);
o_log(DEBUGM, "Generated new session: %s", session_id );
// Create new session structure
struct session_data *session_element = malloc( sizeof(struct session_data) );
session_element->last_accessed = time(NULL);
session_element->session_container = sll_init();
// Save and return
sll_insert( sessions, o_strdup(session_id), session_element );
return session_id;
}
// Delete session that have not been accessed since 'oldest_allowed'
void clear_sessions_older_than( time_t oldest_allowed ) {
struct simpleLinkedList *session = NULL;
struct simpleLinkedList *sess_data = NULL;
int session_expiration_count = 0;
session = sll_findFirstElement( sessions );
while( session != NULL ) {
struct simpleLinkedList *this_session = session;
session = sll_getNext( session );
if( 0 == strcmp( this_session->key, "placeholder" ) )
continue;
struct session_data *sessions_element = (struct session_data *)this_session->data;
if( sessions_element->last_accessed < oldest_allowed ) {
for( sess_data = sll_findFirstElement( sessions_element->session_container ) ; sess_data != NULL ; sess_data = sll_getNext( sess_data ) ) {
free( sess_data->key );
free( sess_data->data );
}
sll_destroy( sll_findFirstElement( sessions_element->session_container ) );
sessions_element->session_container = NULL;
free( sessions_element );
this_session->data = NULL;
o_log( DEBUGM, "Deleting session: %s", this_session->key );
free( this_session->key );
this_session->key = NULL;
sll_delete( this_session );
session_expiration_count++;
}
}
if( session_expiration_count >= 1 ) {
o_log( DEBUGM, "Expired %d sessions", session_expiration_count);
}
}
struct simpleLinkedList *sll_findFirstElement( struct simpleLinkedList *element ) {
if( !element || element->prev == NULL ) {
return element;
}
return sll_findFirstElement( element->prev );
}
