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MINOR: Add ha_generate_uuid_v7

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This function generates a version 7 UUID as per
draft-ietf-uuidrev-rfc4122bis-14.
This commit is contained in:
Tim Duesterhus 2024-04-19 21:01:26 +02:00 committed by Willy Tarreau
parent c6cea750a9
commit aab6477b67
2 changed files with 26 additions and 0 deletions
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1
include/haproxy/tools.h
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@ -1057,6 +1057,7 @@ int parse_dotted_uints(const char *s, unsigned int **nums, size_t *sz);
/* PRNG */
void ha_generate_uuid_v4(struct buffer *output);
void ha_generate_uuid_v7(struct buffer *output);
void ha_random_seed(const unsigned char *seed, size_t len);
void ha_random_jump96(uint32_t dist);
uint64_t ha_random64(void);

25
src/tools.c
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@ -5605,6 +5605,31 @@ void ha_generate_uuid_v4(struct buffer *output)
(long long)((rnd[2] >> 14u) | ((uint64_t) rnd[3] << 18u)) & 0xFFFFFFFFFFFFull);
}
/* Generates a draft-ietf-uuidrev-rfc4122bis-14 version 7 UUID into chunk
* <output> which must be at least 37 bytes large.
*/
void ha_generate_uuid_v7(struct buffer *output)
{
uint32_t rnd[3];
uint64_t last;
uint64_t time;
time = (date.tv_sec * 1000) + (date.tv_usec / 1000);
last = ha_random64();
rnd[0] = last;
rnd[1] = last >> 32;
last = ha_random64();
rnd[2] = last;
chunk_printf(output, "%8.8x-%4.4x-%4.4x-%4.4x-%12.12llx",
(uint)(time >> 16u),
(uint)(time & 0xFFFF),
((rnd[0] >> 16u) & 0xFFF) | 0x7000, // highest 4 bits indicate the uuid version
(rnd[1] & 0x3FFF) | 0x8000, // the highest 2 bits indicate the UUID variant (10),
(long long)((rnd[1] >> 14u) | ((uint64_t) rnd[2] << 18u)) & 0xFFFFFFFFFFFFull);
}
/* only used by parse_line() below. It supports writing in place provided that
* <in> is updated to the next location before calling it. In that case, the