wtp_tid.h

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/*
 * wtp_tid.h - tid verification implementation header
 *
 * By Aarno Syvänen for WapIT Ltd
 */

#ifndef WTP_TID_H
#define WTP_TID_H

typedef struct WTPCached_tid WTPCached_tid;

#include <math.h>
#include <stdlib.h>

#include "gwlib/gwlib.h"
#include "wap_events.h"
#include "wtp_resp.h"

#define WTP_TID_WINDOW_SIZE (1L << 14)

/*
 * Constants defining the result of tid validation
 */
enum {
    no_cached_tid,
    ok,
    fail
};

/*
 * Tid cache item consists of initiator identifier and cached tid.
 */
struct WTPCached_tid {
    WAPAddrTuple *addr_tuple;
    long tid;
};

/* 
 * Initialize tid cache. MUST be called before calling other functions in this 
 * module.
 */

void wtp_tid_cache_init(void);

/*
 * Shut down the tid cache. MUST be called after tid cache isn't used anymore.
 */
void wtp_tid_cache_shutdown(void);

/*
 * Does the tid validation test, by using a simple window mechanism
 *
 * Returns: no_cached_tid, if the peer has no cached last tid, or the result
 * of the test (ok, fail);
 */

int wtp_tid_is_valid(WAPEvent *event, WTPRespMachine *machine);

/*
 * Changes the tid value belonging to an existing initiator
 */
void wtp_tid_set_by_machine(WTPRespMachine *machine, long tid);

#endif