For POSIX platforms, ticks have been absolute which caused an
overflow on 32-bit architectures. This modification makes values
returned by coap_ticks() relative to a global offset stored
internally in coap_clock_offset.
is_local_if() checks if a message's destination address matches
a local interface. As multicast requests are allowed on either
interface, this function now returns true when the destination
address is a multicast address.
coap_network_send() uses the address given by local_interface as
source address of outgoing IP packets. For responses to requests
that have been received via IP multicast, this address is a
multicast group and thus must not be set as source in the IP header.
As a workaround, this change clears the address and ifindex so that
the kernel selects a suitable outbound interface.
When a request has been received via IP multicast, negative
responses including RST should not be sent. This modification
uses the new result code COAP_DROPPED_RESPONSE to indicate that
the response was intentionally suppressed. As the error handling
code only checks for COAP_INVALID_TID, no error messages will
be emitted due to this new behavior.
The calculation of transaction ids did not ensure that the result
is always greater or equal zero. To avoid conflicts with the error
codes returned by coap_send(), the calculation now masks out the
lower half.
With this change, the new No-Response option is recognized by the
helper function msg_option_string() called from coap_show_pdu() for
pretty-printing CoAP messages.
The implementation of option filters based on coap_opt_filter_t
has changed to improve support for long option numbers. An option
filter is now a sparse field of a fixed size that can hold up to
COAP_OPT_FILTER_LONG options with a number larger than 255, and
up to COAP_OPT_FILTER_SHORT options with a number of 255 or less.
The space taken by coap_opt_filter_t is
2 * ((((COAP_OPT_FILTER_SHORT + 1) >> 1) + COAP_OPT_FILTER_LONG) + 1),
or 12 bytes with the default settings for COAP_OPT_FILTER_SHORT == 6
and COAP_OPT_FILTER_LONG == 2.
Three new functions have been added to the option filter API:
* coap_option_filter_set() to store an option number in a filter,
* coap_option_filter_get() to check if a filter contains a given
option number, and
* coap_option_filter_unset() to remove an option number from a
filter.
The previously existing functions coap_option_setb(), coap_option_getb(),
and coap_option_clrb() continue to work on the new option filter
unchanged but now are deprecated.
The function print_readable() did not add a terminating zero in case
len == 0. Now, the output buffer will always have a terminating '\0'
when buf has at least one byte free (i. e. buflen > 0). Note that the
function result does not include the trailing zero-byte.
The new format[0] was inspired by the discussion[1] on the IETF CoRE
mailing list. Changes include:
* Print human-readable message type and method/response code
* Output token included in {...} even if token is empty
* Print human-readable option types
* Print human-readable option values where possible
* Print human-readable Content-Format and Block options
* Print hex string included in <<...>> for binary content,
human-readable string included in '...' for text content
* Use '::' as payload delimiter if message contains a payload
[0] http://www.ietf.org/mail-archive/web/core/current/msg06069.html
[1] http://www.ietf.org/mail-archive/web/core/current/msg06062.html
coap_malloc_type() and coap_free_type() provide an abstract API for
dynamic memory management on different platforms. resource.c still
is in transition and needs more cleanup.
The CoAP resource management is based on uthash and utlist for
platform POSIX but used a custom list implementation for Contiki.
This modification replaces the list handling by utlist macros
entirely. A set of convenience macros has been defined to access
the resources stored in a CoAP context with respect to the
preprocessor symbol COAP_RESOURCES_NOHASH.
The parser iterator did not break up URIs correctly. As this
cannot be fixed easily, the parser iterator has been removed.
coap_split_path_impl() now operates directly on the message
buffer instead of the iterator abstraction.
This bug also caused t_parse_uri12() in the URI test suite
to fail.
* Removed tne preprocessor defines for coap_tick() and coap_clock_init() --
this made the code less readable and seemed to be of little use.
* Introduced the new type coap_time_t to represent wall clock time. On POSIX,
this is the number of seconds since the epoch, while on embedded systems
without a real time clock, this could be the number of seconds since the
last reboot. The new function coap_ticks_to_rt() is used to convert
coap_tick_t to coap_time.h. Currently, this is a division by COAP_TICKS_PER_SECOND
on all platforms.
* POSIX: coap_tick_t is now defined as unsigned long to avoid overflows in
coap_ticks().
On some systems we must the struct in_pktinfo and in6_pktinfo defining
by ourself. But on POSIX systems the definition is made by the header
netinet/in.h, so check if there is a flag HAVE_NETINET_IN_H been set and
skip the self made definition.
In preparation for changing the make buildsystem to a fully autotools
controlled system moving the core libcoap source files to a better logical
place.
All the library related header files moving to include/coap/ to get
all the public and local header files in a separate place. Also moving
the C source files of the libcoap library to the folder src/.
Olaf Bergmann