1 /* dtls -- a very basic DTLS implementation
2 *
3 * Copyright (C) 2011--2014 Olaf Bergmann <bergmann@tzi.org>
4 *
5 * Permission is hereby granted, free of charge, to any person
6 * obtaining a copy of this software and associated documentation
7 * files (the "Software"), to deal in the Software without
8 * restriction, including without limitation the rights to use, copy,
9 * modify, merge, publish, distribute, sublicense, and/or sell copies
10 * of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
20 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
21 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 */
25
26 #include "dtls_config.h"
27 #include "session.h"
28
29 #ifdef HAVE_ASSERT_H
30 #include <assert.h>
31 #else
32 #ifndef assert
33 #warning "assertions are disabled"
34 # define assert(x)
35 #endif
36 #endif
37
38 #ifdef WITH_CONTIKI
39 #define _dtls_address_equals_impl(A,B) \
40 ((A)->size == (B)->size \
41 && (A)->port == (B)->port \
42 && uip_ipaddr_cmp(&((A)->addr),&((B)->addr)) \
43 && (A)->ifindex == (B)->ifindex)
44
45 #else /* WITH_CONTIKI */
46
47 static inline int
_dtls_address_equals_impl(const session_t * a,const session_t * b)48 _dtls_address_equals_impl(const session_t *a,
49 const session_t *b) {
50 if (a->ifindex != b->ifindex ||
51 a->size != b->size || a->addr.sa.sa_family != b->addr.sa.sa_family)
52 return 0;
53
54 /* need to compare only relevant parts of sockaddr_in6 */
55 switch (a->addr.sa.sa_family) {
56 case AF_INET:
57 return
58 a->addr.sin.sin_port == b->addr.sin.sin_port &&
59 memcmp(&a->addr.sin.sin_addr, &b->addr.sin.sin_addr,
60 sizeof(struct in_addr)) == 0;
61 case AF_INET6:
62 return a->addr.sin6.sin6_port == b->addr.sin6.sin6_port &&
63 memcmp(&a->addr.sin6.sin6_addr, &b->addr.sin6.sin6_addr,
64 sizeof(struct in6_addr)) == 0;
65 default: /* fall through and signal error */
66 ;
67 }
68 return 0;
69 }
70 #endif /* WITH_CONTIKI */
71
72 void
dtls_session_init(session_t * sess)73 dtls_session_init(session_t *sess) {
74 assert(sess);
75 memset(sess, 0, sizeof(session_t));
76 sess->size = sizeof(sess->addr);
77 }
78
79 int
dtls_session_equals(const session_t * a,const session_t * b)80 dtls_session_equals(const session_t *a, const session_t *b) {
81 assert(a); assert(b);
82 return _dtls_address_equals_impl(a, b);
83 }
84
