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dtls_prng_posix.c: Fix random() only support

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Use of random() requires that _GNU_SOURCE is defined.
Cannot use variables named rand.

Make sure that dtls_prng.o is rebuilt whenever any of the
platform-specific/dtls_prng_*.c files are updated.

Signed-off-by: Jon Shallow <supjps-libcoap@jpshallow.com>
This commit is contained in:
Jon Shallow 2023-04-15 19:17:57 +01:00 committed by Achim Kraus
parent 11c8e7d612
commit a5fa982aa5
2 changed files with 12 additions and 4 deletions
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2
Makefile.in
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@ -85,6 +85,8 @@ dirs: $(SUBDIRS)
$(MAKE) -C $$dir ; \
done
dtls_prng.o:: $(wildcard platform-specific/dtls_prng_*.c)
$(SUB_OBJECTS)::
$(MAKE) -C $(@D) $(@F)

14
platform-specific/dtls_prng_posix.c
View File

@ -18,6 +18,12 @@
*
*******************************************************************************/
#ifdef HAVE_RANDOM
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif /* _GNU_SOURCE */
#endif /* HAVE_RANDOM */
#include "tinydtls.h"
#include "dtls_prng.h"
#include "dtls_debug.h"
@ -44,16 +50,16 @@ dtls_prng(unsigned char *buf, size_t len) {
if (len) {
size_t klen = len;
uint8_t byte_counter = RAND_BYTES;
uint32_t rand = random();
uint32_t rand_val = random();
while (1) {
*buf++ = rand & 0xFF;
*buf++ = rand_val & 0xFF;
if (!--klen) {
break;
}
if (--byte_counter) {
rand >>= 8;
rand_val >>= 8;
} else {
rand = random();
rand_val = random();
byte_counter = RAND_BYTES;
}
}