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/*
* Copyright (c) 2002 Marcel Moolenaar
* Copyright (c) 2022 Tobias C. Berner
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
#include <sys/capsicum.h>
#include <capsicum_helpers.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <uuid.h>
static void
usage(void)
{
(void)fprintf(stderr,
"usage: uuidgen [-1] [-r] [-n count] [-o filename]\n");
exit(1);
}
static void
uuid_to_compact_string(const uuid_t *u, char **s, uint32_t *status)
{
uuid_t nil;
if (status != NULL)
*status = uuid_s_ok;
if (s == NULL)
return;
if (u == NULL) {
u = &nil;
uuid_create_nil(&nil, NULL);
}
asprintf(s, "%08x%04x%04x%02x%02x%02x%02x%02x%02x%02x%02x",
u->time_low, u->time_mid, u->time_hi_and_version,
u->clock_seq_hi_and_reserved, u->clock_seq_low, u->node[0],
u->node[1], u->node[2], u->node[3], u->node[4], u->node[5]);
if (*s == NULL && status != NULL)
*status = uuid_s_no_memory;
}
static int
uuidgen_v4(struct uuid *store, int count)
{
int size;
struct uuid *item;
if (count < 1) {
errno = EINVAL;
return (-1);
}
size = sizeof(struct uuid) * count;
arc4random_buf(store, size);
item = store;
for (int i = 0; i < count; ++i) {
/*
* Set the two most significant bits (bits 6 and 7) of the
* clock_seq_hi_and_reserved to zero and one, respectively.
*/
item->clock_seq_hi_and_reserved &= ~(3 << 6);
item->clock_seq_hi_and_reserved |= (2 << 6);
/*
* Set the four most significant bits (bits 12 through 15) of
* the time_hi_and_version field to the 4-bit version number
* from Section 4.1.3.
*/
item->time_hi_and_version &= ~(15 << 12);
item->time_hi_and_version |= (4 << 12);
item++;
};
return (0);
}
int
main(int argc, char *argv[])
{
FILE *fp;
uuid_t *store, *uuid;
char *p;
int ch, count, i, iterate, status, version;
void (*tostring)(const uuid_t *, char **, uint32_t *) = uuid_to_string;
count = -1; /* no count yet */
fp = stdout; /* default output file */
iterate = 0; /* not one at a time */
version = 1; /* create uuid v1 by default */
while ((ch = getopt(argc, argv, "1crn:o:")) != -1)
switch (ch) {
case '1':
iterate = 1;
break;
case 'c':
tostring = uuid_to_compact_string;
break;
case 'r':
version = 4;
break;
case 'n':
if (count > 0)
usage();
count = strtol(optarg, &p, 10);
if (*p != 0 || count < 1)
usage();
break;
case 'o':
if (fp != stdout)
errx(1, "multiple output files not allowed");
fp = fopen(optarg, "w");
if (fp == NULL)
err(1, "fopen");
break;
default:
usage();
}
argv += optind;
argc -= optind;
if (argc)
usage();
caph_cache_catpages();
if (caph_limit_stdio() < 0)
err(1, "Unable to limit stdio");
if (caph_enter() < 0)
err(1, "Unable to enter capability mode");
if (count == -1)
count = 1;
store = (uuid_t *)malloc(sizeof(uuid_t) * count);
if (store == NULL)
err(1, "malloc()");
if (!iterate) {
/* Get them all in a single batch */
if (version == 1) {
if (uuidgen(store, count) != 0)
err(1, "uuidgen()");
} else if (version == 4) {
if (uuidgen_v4(store, count) != 0)
err(1, "uuidgen_v4()");
} else {
err(1, "unsupported version");
}
} else {
uuid = store;
for (i = 0; i < count; i++) {
if (version == 1) {
if (uuidgen(uuid++, 1) != 0)
err(1, "uuidgen()");
} else if (version == 4) {
if (uuidgen_v4(uuid++, 1) != 0)
err(1, "uuidgen_v4()");
} else {
err(1, "unsupported version");
}
}
}
uuid = store;
while (count--) {
tostring(uuid++, &p, &status);
if (status != uuid_s_ok)
err(1, "cannot stringify a UUID");
fprintf(fp, "%s\n", p);
free(p);
}
free(store);
if (fp != stdout)
fclose(fp);
return (0);
}
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