Switch to an internal implementation of uuid generation, so we can use the randomness pool.

adsbus/uuid.c

@@ -0,0 +1,21 @@
+#include <stdint.h>
+
+#include "rand.h"
+#include "common.h"
+
+#include "uuid.h"
+
+void uuid_gen(char *out) {
+	uint8_t uuid[16];
+	rand_fill(uuid, 16);
+	uuid[6] = (uuid[6] & 0x0F) | 0x40;
+	uuid[8] = (uuid[8] & 0x3F) | 0x80;
+
+	out[8] = out[13] = out[18] = out[23] = '-';
+	out[36] = '\0';
+	hex_from_bin_lower(&out[0], &uuid[0], 4);
+	hex_from_bin_lower(&out[9], &uuid[4], 2);
+	hex_from_bin_lower(&out[14], &uuid[6], 2);
+	hex_from_bin_lower(&out[19], &uuid[8], 2);
+	hex_from_bin_lower(&out[24], &uuid[10], 6);
+}