Ashley Mills / tinydtls_0_4_0

mbed port of tinydtls

global.h@1:bc8a649bad13, 2013-10-11 (annotated)

Committer:
ashleymills
Date:
Fri Oct 11 08:46:21 2013 +0000
Revision:
1:bc8a649bad13
Parent:
0:04990d454f45 
Cleaned up all the debug stuff I added finding the hash table bug.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ashleymills 0:04990d454f45 1 /* dtls -- a very basic DTLS implementation
ashleymills 0:04990d454f45 2 *
ashleymills 0:04990d454f45 3 * Copyright (C) 2011--2012 Olaf Bergmann <bergmann@tzi.org>
ashleymills 0:04990d454f45 4 *
ashleymills 0:04990d454f45 5 * Permission is hereby granted, free of charge, to any person
ashleymills 0:04990d454f45 6 * obtaining a copy of this software and associated documentation
ashleymills 0:04990d454f45 7 * files (the "Software"), to deal in the Software without
ashleymills 0:04990d454f45 8 * restriction, including without limitation the rights to use, copy,
ashleymills 0:04990d454f45 9 * modify, merge, publish, distribute, sublicense, and/or sell copies
ashleymills 0:04990d454f45 10 * of the Software, and to permit persons to whom the Software is
ashleymills 0:04990d454f45 11 * furnished to do so, subject to the following conditions:
ashleymills 0:04990d454f45 12 *
ashleymills 0:04990d454f45 13 * The above copyright notice and this permission notice shall be
ashleymills 0:04990d454f45 14 * included in all copies or substantial portions of the Software.
ashleymills 0:04990d454f45 15 *
ashleymills 0:04990d454f45 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
ashleymills 0:04990d454f45 17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
ashleymills 0:04990d454f45 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
ashleymills 0:04990d454f45 19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
ashleymills 0:04990d454f45 20 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ashleymills 0:04990d454f45 21 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
ashleymills 0:04990d454f45 22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
ashleymills 0:04990d454f45 23 * SOFTWARE.
ashleymills 0:04990d454f45 24 */
ashleymills 0:04990d454f45 25
ashleymills 0:04990d454f45 26 #ifndef _GLOBAL_H_
ashleymills 0:04990d454f45 27 #define _GLOBAL_H_
ashleymills 0:04990d454f45 28
ashleymills 0:04990d454f45 29 #include "config.h"
ashleymills 0:04990d454f45 30
ashleymills 0:04990d454f45 31 #ifdef HAVE_ASSERT_H
ashleymills 0:04990d454f45 32 #include <assert.h>
ashleymills 0:04990d454f45 33 #else
ashleymills 0:04990d454f45 34 #ifndef assert
ashleymills 0:04990d454f45 35 #warning "assertions are disabled"
ashleymills 0:04990d454f45 36 # define assert(x)
ashleymills 0:04990d454f45 37 #endif
ashleymills 0:04990d454f45 38 #endif
ashleymills 0:04990d454f45 39
ashleymills 0:04990d454f45 40 #include <string.h>
ashleymills 0:04990d454f45 41 #ifdef HAVE_SYS_SOCKET_H
ashleymills 0:04990d454f45 42 #include <sys/socket.h>
ashleymills 0:04990d454f45 43 #endif
ashleymills 0:04990d454f45 44 #ifdef HAVE_SYS_TYPES_H
ashleymills 0:04990d454f45 45 #include <sys/types.h>
ashleymills 0:04990d454f45 46 #endif
ashleymills 0:04990d454f45 47 #ifdef HAVE_NETINET_IN_H
ashleymills 0:04990d454f45 48 #include <netinet/in.h>
ashleymills 0:04990d454f45 49 #endif
ashleymills 0:04990d454f45 50 #ifdef HAVE_ARPA_INET_H
ashleymills 0:04990d454f45 51 #include <arpa/inet.h>
ashleymills 0:04990d454f45 52 #endif
ashleymills 0:04990d454f45 53
ashleymills 0:04990d454f45 54 #ifdef MBED
ashleymills 0:04990d454f45 55 //#include "lwip/inet.h"
ashleymills 0:04990d454f45 56 #include "lwip/sockets.h"
ashleymills 0:04990d454f45 57 #include "lwip/netdb.h"
ashleymills 0:04990d454f45 58 #endif
ashleymills 0:04990d454f45 59
ashleymills 0:04990d454f45 60 #ifndef DTLSv12
ashleymills 0:04990d454f45 61 /* The current version of tinyDTLS supports DTLSv1.2 only. */
ashleymills 0:04990d454f45 62 #define DTLSv12 1
ashleymills 0:04990d454f45 63 #endif
ashleymills 0:04990d454f45 64
ashleymills 0:04990d454f45 65 #ifndef WITH_SHA256
ashleymills 0:04990d454f45 66 /* The current version of tinyDTLS supports DTLSv1.2 with SHA256 PRF
ashleymills 0:04990d454f45 67 only. */
ashleymills 0:04990d454f45 68 #define WITH_SHA256 1
ashleymills 0:04990d454f45 69 #endif
ashleymills 0:04990d454f45 70
ashleymills 0:04990d454f45 71 #ifndef WITH_CONTIKI
ashleymills 0:04990d454f45 72 typedef unsigned int clock_time_t;
ashleymills 0:04990d454f45 73 #else /* WITH_CONTIKI */
ashleymills 0:04990d454f45 74 #include "uip.h"
ashleymills 0:04990d454f45 75 typedef struct {
ashleymills 0:04990d454f45 76 unsigned char size;
ashleymills 0:04990d454f45 77 uip_ipaddr_t addr;
ashleymills 0:04990d454f45 78 unsigned short port;
ashleymills 0:04990d454f45 79 int ifindex;
ashleymills 0:04990d454f45 80 } __uip_session_t;
ashleymills 0:04990d454f45 81 #define session_t __uip_session_t
ashleymills 0:04990d454f45 82
ashleymills 0:04990d454f45 83 #define _dtls_address_equals_impl(A,B) \
ashleymills 0:04990d454f45 84 ((A)->size == (B)->size \
ashleymills 0:04990d454f45 85 && (A)->port == (B)->port \
ashleymills 0:04990d454f45 86 && uip_ipaddr_cmp(&((A)->addr),&((B)->addr)) \
ashleymills 0:04990d454f45 87 && (A)->ifindex == (B)->ifindex)
ashleymills 0:04990d454f45 88
ashleymills 0:04990d454f45 89 #endif /* WITH_CONTIKI */
ashleymills 0:04990d454f45 90
ashleymills 0:04990d454f45 91 /** multi-purpose address abstraction */
ashleymills 0:04990d454f45 92 #ifndef session_t
ashleymills 0:04990d454f45 93 typedef struct __session_t {
ashleymills 0:04990d454f45 94 socklen_t size; /**< size of addr */
ashleymills 0:04990d454f45 95 union {
ashleymills 0:04990d454f45 96 struct sockaddr sa;
ashleymills 0:04990d454f45 97 //struct sockaddr_storage st;
ashleymills 0:04990d454f45 98 struct sockaddr_in sin;
ashleymills 0:04990d454f45 99 //struct sockaddr_in6 sin6;
ashleymills 0:04990d454f45 100 } addr;
ashleymills 0:04990d454f45 101 int ifindex;
ashleymills 0:04990d454f45 102 } __session_t;
ashleymills 0:04990d454f45 103
ashleymills 0:04990d454f45 104 #define session_t __session_t
ashleymills 0:04990d454f45 105
ashleymills 0:04990d454f45 106
ashleymills 0:04990d454f45 107
ashleymills 0:04990d454f45 108 static inline int
ashleymills 0:04990d454f45 109 _dtls_address_equals_impl(const session_t *a,
ashleymills 0:04990d454f45 110 const session_t *b) {
ashleymills 0:04990d454f45 111 if (a->ifindex != b->ifindex ||
ashleymills 0:04990d454f45 112 a->size != b->size || a->addr.sa.sa_family != b->addr.sa.sa_family)
ashleymills 0:04990d454f45 113 return 0;
ashleymills 0:04990d454f45 114
ashleymills 0:04990d454f45 115 /* need to compare only relevant parts of sockaddr_in6 */
ashleymills 0:04990d454f45 116 switch (a->addr.sa.sa_family) {
ashleymills 0:04990d454f45 117 case AF_INET:
ashleymills 0:04990d454f45 118 return
ashleymills 0:04990d454f45 119 a->addr.sin.sin_port == b->addr.sin.sin_port &&
ashleymills 0:04990d454f45 120 memcmp(&a->addr.sin.sin_addr, &b->addr.sin.sin_addr,
ashleymills 0:04990d454f45 121 sizeof(struct in_addr)) == 0;
ashleymills 0:04990d454f45 122 /*
ashleymills 0:04990d454f45 123 case AF_INET6:
ashleymills 0:04990d454f45 124 return a->addr.sin6.sin6_port == b->addr.sin6.sin6_port &&
ashleymills 0:04990d454f45 125 memcmp(&a->addr.sin6.sin6_addr, &b->addr.sin6.sin6_addr,
ashleymills 0:04990d454f45 126 sizeof(struct in6_addr)) == 0;
ashleymills 0:04990d454f45 127 */
ashleymills 0:04990d454f45 128 default: /* fall through and signal error */
ashleymills 0:04990d454f45 129 ;
ashleymills 0:04990d454f45 130 }
ashleymills 0:04990d454f45 131 return 0;
ashleymills 0:04990d454f45 132 }
ashleymills 0:04990d454f45 133 #endif /* session_t */
ashleymills 0:04990d454f45 134
ashleymills 0:04990d454f45 135 /* Define our own types as at least uint32_t does not work on my amd64. */
ashleymills 0:04990d454f45 136
ashleymills 0:04990d454f45 137 typedef unsigned char uint8;
ashleymills 0:04990d454f45 138 typedef unsigned char uint16[2];
ashleymills 0:04990d454f45 139 typedef unsigned char uint24[3];
ashleymills 0:04990d454f45 140 typedef unsigned char uint32[4];
ashleymills 0:04990d454f45 141 typedef unsigned char uint48[6];
ashleymills 0:04990d454f45 142
ashleymills 0:04990d454f45 143 #ifndef HAVE_STR
ashleymills 0:04990d454f45 144 typedef struct {
ashleymills 0:04990d454f45 145 size_t length; /* length of string */
ashleymills 0:04990d454f45 146 unsigned char *s; /* string data */
ashleymills 0:04990d454f45 147 } str;
ashleymills 0:04990d454f45 148 #endif
ashleymills 0:04990d454f45 149
ashleymills 0:04990d454f45 150 #ifndef DTLS_MAX_BUF
ashleymills 0:04990d454f45 151 /** Maximum size of DTLS message. */
ashleymills 0:04990d454f45 152 #define DTLS_MAX_BUF 256
ashleymills 0:04990d454f45 153 #endif
ashleymills 0:04990d454f45 154
ashleymills 0:04990d454f45 155 #ifndef DTLS_DEFAULT_MAX_RETRANSMIT
ashleymills 0:04990d454f45 156 /** Number of message retransmissions. */
ashleymills 0:04990d454f45 157 #define DTLS_DEFAULT_MAX_RETRANSMIT 5
ashleymills 0:04990d454f45 158 #endif
ashleymills 0:04990d454f45 159
ashleymills 0:04990d454f45 160 /** Known cipher suites.*/
ashleymills 0:04990d454f45 161 typedef enum {
ashleymills 0:04990d454f45 162 TLS_NULL_WITH_NULL_NULL = 0x0000, /**< NULL cipher */
ashleymills 0:04990d454f45 163 TLS_PSK_WITH_AES_128_CCM_8 = 0xC0A8 /**< see RFC 6655 */
ashleymills 0:04990d454f45 164 } dtls_cipher_t;
ashleymills 0:04990d454f45 165
ashleymills 0:04990d454f45 166 /**
ashleymills 0:04990d454f45 167 * XORs \p n bytes byte-by-byte starting at \p y to the memory area
ashleymills 0:04990d454f45 168 * starting at \p x. */
ashleymills 0:04990d454f45 169 static inline void
ashleymills 0:04990d454f45 170 memxor(unsigned char *x, const unsigned char *y, size_t n) {
ashleymills 0:04990d454f45 171 while(n--) {
ashleymills 0:04990d454f45 172 *x ^= *y;
ashleymills 0:04990d454f45 173 x++; y++;
ashleymills 0:04990d454f45 174 }
ashleymills 0:04990d454f45 175 }
ashleymills 0:04990d454f45 176
ashleymills 0:04990d454f45 177 #ifdef HAVE_FLS
ashleymills 0:04990d454f45 178 #define dtls_fls(i) fls(i)
ashleymills 0:04990d454f45 179 #else
ashleymills 0:04990d454f45 180 static inline int
ashleymills 0:04990d454f45 181 dtls_fls(unsigned int i) {
ashleymills 0:04990d454f45 182 int n;
ashleymills 0:04990d454f45 183 for (n = 0; i; n++)
ashleymills 0:04990d454f45 184 i >>= 1;
ashleymills 0:04990d454f45 185 return n;
ashleymills 0:04990d454f45 186 }
ashleymills 0:04990d454f45 187 #endif /* HAVE_FLS */
ashleymills 0:04990d454f45 188
ashleymills 0:04990d454f45 189 /**
ashleymills 0:04990d454f45 190 * Resets the given session_t object @p sess to its default
ashleymills 0:04990d454f45 191 * values. In particular, the member rlen must be initialized to the
ashleymills 0:04990d454f45 192 * available size for storing addresses.
ashleymills 0:04990d454f45 193 *
ashleymills 0:04990d454f45 194 * @param sess The session_t object to initialize.
ashleymills 0:04990d454f45 195 */
ashleymills 0:04990d454f45 196 static inline void
ashleymills 0:04990d454f45 197 dtls_session_init(session_t *sess) {
ashleymills 0:04990d454f45 198 assert(sess);
ashleymills 0:04990d454f45 199 memset(sess, 0, sizeof(session_t));
ashleymills 0:04990d454f45 200 sess->size = sizeof(sess->addr);
ashleymills 0:04990d454f45 201 }
ashleymills 0:04990d454f45 202
ashleymills 0:04990d454f45 203 static inline int
ashleymills 0:04990d454f45 204 dtls_session_equals(const session_t *a, const session_t *b) {
ashleymills 0:04990d454f45 205 assert(a); assert(b);
ashleymills 0:04990d454f45 206 return _dtls_address_equals_impl(a, b);
ashleymills 0:04990d454f45 207 }
ashleymills 0:04990d454f45 208 #endif /* _GLOBAL_H_ */