/* dtls -- a very basic DTLS implementation
 *
 * Copyright (C) 2011--2014 Olaf Bergmann <bergmann@tzi.org>
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "dtls_config.h"
#include "session.h"

#ifdef HAVE_ASSERT_H
#include <assert.h>
#else
#ifndef assert
#warning "assertions are disabled"
#  define assert(x)
#endif
#endif

#ifdef WITH_CONTIKI
#define _dtls_address_equals_impl(A,B)				\
  ((A)->size == (B)->size					\
   && (A)->addr.port == (B)->addr.port				\
   && uip_ipaddr_cmp(&((A)->addr.ipaddr),&((B)->addr.ipaddr))	\
   && (A)->ifindex == (B)->ifindex)

#else /* WITH_CONTIKI */

static inline int 
_dtls_address_equals_impl(const session_t *a,
			  const session_t *b) {
  if (a->ifindex != b->ifindex ||
      a->size != b->size || a->addr.sa.sa_family != b->addr.sa.sa_family)
    return 0;
  
  /* need to compare only relevant parts of sockaddr_in6 */
 switch (a->addr.sa.sa_family) {
 case AF_INET:
   return 
     a->addr.sin.sin_port == b->addr.sin.sin_port && 
     memcmp(&a->addr.sin.sin_addr, &b->addr.sin.sin_addr, 
	    sizeof(struct in_addr)) == 0;
 case AF_INET6:
   return a->addr.sin6.sin6_port == b->addr.sin6.sin6_port && 
     memcmp(&a->addr.sin6.sin6_addr, &b->addr.sin6.sin6_addr, 
	    sizeof(struct in6_addr)) == 0;
 default: /* fall through and signal error */
   ;
 }
 return 0;
}
#endif /* WITH_CONTIKI */

void
dtls_session_init(session_t *sess) {
  assert(sess);
  memset(sess, 0, sizeof(session_t));
  sess->size = sizeof(sess->addr);
}

int
dtls_session_equals(const session_t *a, const session_t *b) {
  assert(a); assert(b);
  return _dtls_address_equals_impl(a, b);
}