bin/uuidgen: add support for v4 uuids
The version 4 UUID is meant for generating UUIDs from truly-random or pseudo-random numbers. [1] bin/uuidgen gained the new flag '-r' to create version 4 UUID. [1] RFC 4122, https://www.rfc-editor.org/rfc/rfc4122#section-4.4 Reviewed by: pstef Approved by: bapt MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D37695
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@ -33,6 +33,7 @@
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.Sh SYNOPSIS
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.Nm
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.Op Fl 1
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.Op Fl r
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.Op Fl n Ar count
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.Op Fl o Ar filename
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.Sh DESCRIPTION
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@ -50,6 +51,8 @@ This option only has effect if multiple identifiers are to be generated and
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instructs
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.Nm
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to not generate them in batch, but one at a time.
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.It Fl r
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This option controls creation of random UUID (version 4).
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.It Fl n
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This option controls the number of identifiers generated.
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By default, multiple identifiers are generated in batch.
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@ -1,5 +1,6 @@
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/*
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* Copyright (c) 2002 Marcel Moolenaar
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* Copyright (c) 2022 Tobias C. Berner
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -40,26 +41,63 @@ __FBSDID("$FreeBSD$");
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: uuidgen [-1] [-n count] [-o filename]\n");
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(void)fprintf(stderr,
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"usage: uuidgen [-1] [-r] [-n count] [-o filename]\n");
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exit(1);
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}
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static int
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uuidgen_v4(struct uuid *store, int count)
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{
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int size;
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struct uuid *item;
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if (count < 1) {
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errno = EINVAL;
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return (-1);
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}
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size = sizeof(struct uuid) * count;
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arc4random_buf(store, size);
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item = store;
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for (int i = 0; i < count; ++i) {
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/*
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* Set the two most significant bits (bits 6 and 7) of the
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* clock_seq_hi_and_reserved to zero and one, respectively.
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*/
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item->clock_seq_hi_and_reserved &= ~(3 << 6);
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item->clock_seq_hi_and_reserved |= (2 << 6);
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/*
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* Set the four most significant bits (bits 12 through 15) of
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* the time_hi_and_version field to the 4-bit version number
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* from Section 4.1.3.
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*/
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item->time_hi_and_version &= ~(15 << 12);
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item->time_hi_and_version |= (4 << 12);
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item++;
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};
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return (0);
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}
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int
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main(int argc, char *argv[])
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{
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FILE *fp;
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uuid_t *store, *uuid;
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char *p;
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int ch, count, i, iterate, status;
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int ch, count, i, iterate, status, version;
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count = -1; /* no count yet */
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fp = stdout; /* default output file */
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iterate = 0; /* not one at a time */
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while ((ch = getopt(argc, argv, "1n:o:")) != -1)
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count = -1; /* no count yet */
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fp = stdout; /* default output file */
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iterate = 0; /* not one at a time */
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version = 1; /* create uuid v1 by default */
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while ((ch = getopt(argc, argv, "1rn:o:")) != -1)
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switch (ch) {
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case '1':
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iterate = 1;
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break;
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case 'r':
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version = 4;
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break;
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case 'n':
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if (count > 0)
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usage();
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@ -92,19 +130,33 @@ main(int argc, char *argv[])
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if (count == -1)
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count = 1;
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store = (uuid_t*)malloc(sizeof(uuid_t) * count);
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store = (uuid_t *)malloc(sizeof(uuid_t) * count);
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if (store == NULL)
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err(1, "malloc()");
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if (!iterate) {
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/* Get them all in a single batch */
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if (uuidgen(store, count) != 0)
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err(1, "uuidgen()");
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if (version == 1) {
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if (uuidgen(store, count) != 0)
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err(1, "uuidgen()");
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} else if (version == 4) {
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if (uuidgen_v4(store, count) != 0)
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err(1, "uuidgen_v4()");
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} else {
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err(1, "unsupported version");
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}
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} else {
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uuid = store;
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for (i = 0; i < count; i++) {
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if (uuidgen(uuid++, 1) != 0)
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err(1, "uuidgen()");
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if (version == 1) {
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if (uuidgen(uuid++, 1) != 0)
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err(1, "uuidgen()");
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} else if (version == 4) {
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if (uuidgen_v4(uuid++, 1) != 0)
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err(1, "uuidgen_v4()");
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} else {
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err(1, "unsupported version");
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}
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}
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}
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@ -112,7 +164,7 @@ main(int argc, char *argv[])
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while (count--) {
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uuid_to_string(uuid++, &p, &status);
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if (status != uuid_s_ok)
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err(1, "cannot stringify a UUID");
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err(1, "cannot stringify a UUID");
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fprintf(fp, "%s\n", p);
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free(p);
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}
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