Ashley Mills / tinydtls_0_4_0

mbed port of tinydtls

peer.h@0:04990d454f45, 2013-10-10 (annotated)

Committer:
ashleymills
Date:
Thu Oct 10 21:38:07 2013 +0000
Revision:
0:04990d454f45
It now works. Found nasty gotcha with non-std sockaddr_in

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--2013 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 /**
ashleymills 0:04990d454f45 27 * @file peer.h
ashleymills 0:04990d454f45 28 * @brief information about peers in a DTLS session
ashleymills 0:04990d454f45 29 */
ashleymills 0:04990d454f45 30
ashleymills 0:04990d454f45 31 #ifndef _PEER_H_
ashleymills 0:04990d454f45 32 #define _PEER_H_
ashleymills 0:04990d454f45 33
ashleymills 0:04990d454f45 34 #include "config.h"
ashleymills 0:04990d454f45 35 #include "global.h"
ashleymills 0:04990d454f45 36
ashleymills 0:04990d454f45 37 #include "state.h"
ashleymills 0:04990d454f45 38 #include "crypto.h"
ashleymills 0:04990d454f45 39
ashleymills 0:04990d454f45 40 #ifndef WITH_CONTIKI
ashleymills 0:04990d454f45 41 #include "uthash.h"
ashleymills 0:04990d454f45 42 #endif /* WITH_CONTIKI */
ashleymills 0:04990d454f45 43
ashleymills 0:04990d454f45 44 /**
ashleymills 0:04990d454f45 45 * Holds security parameters, local state and the transport address
ashleymills 0:04990d454f45 46 * for each peer. */
ashleymills 0:04990d454f45 47 typedef struct dtls_peer_t {
ashleymills 0:04990d454f45 48 #ifndef WITH_CONTIKI
ashleymills 0:04990d454f45 49 UT_hash_handle hh;
ashleymills 0:04990d454f45 50 #else /* WITH_CONTIKI */
ashleymills 0:04990d454f45 51 struct dtls_peer_t *next;
ashleymills 0:04990d454f45 52 #endif /* WITH_CONTIKI */
ashleymills 0:04990d454f45 53
ashleymills 0:04990d454f45 54 session_t session; /**< peer address and local interface */
ashleymills 0:04990d454f45 55
ashleymills 0:04990d454f45 56 dtls_state_t state; /**< DTLS engine state */
ashleymills 0:04990d454f45 57 uint16 epoch; /**< counter for cipher state changes*/
ashleymills 0:04990d454f45 58 uint48 rseq; /**< sequence number of last record sent */
ashleymills 0:04990d454f45 59
ashleymills 0:04990d454f45 60 dtls_hs_state_t hs_state; /**< handshake protocol status */
ashleymills 0:04990d454f45 61
ashleymills 0:04990d454f45 62 dtls_security_parameters_t security_params[2];
ashleymills 0:04990d454f45 63 int config; /**< denotes which security params are in effect */
ashleymills 0:04990d454f45 64 /* FIXME: check if we can use epoch for this */
ashleymills 0:04990d454f45 65 } dtls_peer_t;
ashleymills 0:04990d454f45 66
ashleymills 0:04990d454f45 67 /**
ashleymills 0:04990d454f45 68 * Creates a new peer for given @p session. The current configuration
ashleymills 0:04990d454f45 69 * is initialized with the cipher suite TLS_NULL_WITH_NULL_NULL (i.e.
ashleymills 0:04990d454f45 70 * no security at all). This function returns a pointer to the new
ashleymills 0:04990d454f45 71 * peer or NULL on error. The caller is responsible for releasing the
ashleymills 0:04990d454f45 72 * storage allocated for this peer using dtls_free_peer().
ashleymills 0:04990d454f45 73 *
ashleymills 0:04990d454f45 74 * @param session The remote peer's address and local interface index.
ashleymills 0:04990d454f45 75 * @return A pointer to a newly created and initialized peer object
ashleymills 0:04990d454f45 76 * or NULL on error.
ashleymills 0:04990d454f45 77 */
ashleymills 0:04990d454f45 78 dtls_peer_t *dtls_new_peer(const session_t *session);
ashleymills 0:04990d454f45 79
ashleymills 0:04990d454f45 80 /** Releases the storage allocated to @p peer. */
ashleymills 0:04990d454f45 81 void dtls_free_peer(dtls_peer_t *peer);
ashleymills 0:04990d454f45 82
ashleymills 0:04990d454f45 83 /** Returns the current state of @p peer. */
ashleymills 0:04990d454f45 84 static inline dtls_state_t dtls_peer_state(const dtls_peer_t *peer) {
ashleymills 0:04990d454f45 85 return peer->state;
ashleymills 0:04990d454f45 86 }
ashleymills 0:04990d454f45 87
ashleymills 0:04990d454f45 88 /**
ashleymills 0:04990d454f45 89 * Checks if given @p peer is connected. This function returns
ashleymills 0:04990d454f45 90 * @c 1 if connected, or @c 0 otherwise.
ashleymills 0:04990d454f45 91 */
ashleymills 0:04990d454f45 92 static inline int dtls_peer_is_connected(const dtls_peer_t *peer) {
ashleymills 0:04990d454f45 93 return peer->state == DTLS_STATE_CONNECTED;
ashleymills 0:04990d454f45 94 }
ashleymills 0:04990d454f45 95
ashleymills 0:04990d454f45 96 #define CURRENT_CONFIG(Peer) (&(Peer)->security_params[(Peer)->config])
ashleymills 0:04990d454f45 97 #define OTHER_CONFIG(Peer) (&(Peer)->security_params[!((Peer)->config & 0x01)])
ashleymills 0:04990d454f45 98
ashleymills 0:04990d454f45 99 #define SWITCH_CONFIG(Peer) ((Peer)->config = !((Peer)->config & 0x01))
ashleymills 0:04990d454f45 100
ashleymills 0:04990d454f45 101 #endif /* _PEER_H_ */