serval-dna/serval_uuid.c

122 lines
3.7 KiB
C
Raw Normal View History

/*
Serval DNA Universally Unique Identifier support
Copyright (C) 2013 Serval Project Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "lang.h" // for FALLTHROUGH
#define __SERVAL_DNA__SERVAL_UUID_H_INLINE
#include "serval_uuid.h"
#include "os.h"
#include "str.h"
#include <sodium.h>
#include <assert.h>
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
enum serval_uuid_version serval_uuid_get_version(const serval_uuid_t *uuid)
{
assert(serval_uuid_is_valid(uuid));
switch (ntohs(uuid->u.record.time_hi_and_version) & 0xf000) {
case 0x1000: return UUID_VERSION_TIME_BASED;
case 0x2000: return UUID_VERSION_DCE_SECURITY;
case 0x3000: return UUID_VERSION_NAME_MD5;
case 0x4000: return UUID_VERSION_RANDOM;
case 0x5000: return UUID_VERSION_NAME_SHA1;
}
return UUID_VERSION_UNSUPPORTED;
}
void serval_uuid_set_version(serval_uuid_t *uuid, enum serval_uuid_version version)
{
uint16_t version_bits;
switch (version) {
case UUID_VERSION_TIME_BASED: version_bits = 0x1000; break;
case UUID_VERSION_DCE_SECURITY: version_bits = 0x2000; break;
case UUID_VERSION_NAME_MD5: version_bits = 0x3000; break;
case UUID_VERSION_RANDOM: version_bits = 0x4000; break;
case UUID_VERSION_NAME_SHA1: version_bits = 0x5000; break;
default: abort();
}
assert(serval_uuid_is_valid(uuid));
uuid->u.record.time_hi_and_version = htons((ntohs(uuid->u.record.time_hi_and_version) & 0xfff) | version_bits);
}
int serval_uuid_generate_random(serval_uuid_t *uuid)
{
randombytes_buf(uuid->u.binary, sizeof uuid->u.binary);
// The following discards 6 random bits.
uuid->u.record.clock_seq_hi_and_reserved &= 0x3f;
uuid->u.record.clock_seq_hi_and_reserved |= 0x80;
serval_uuid_set_version(uuid, UUID_VERSION_RANDOM);
return 0;
}
strbuf strbuf_uuid(strbuf sb, const serval_uuid_t *uuid)
{
assert(serval_uuid_is_valid(uuid));
unsigned i;
for (i = 0; i != sizeof uuid->u.binary; ++i) {
switch (i) {
case 4: case 6: case 8: case 10:
strbuf_putc(sb, '-');
FALLTHROUGH;
default:
strbuf_putc(sb, hexdigit_lower[uuid->u.binary[i] >> 4]);
strbuf_putc(sb, hexdigit_lower[uuid->u.binary[i] & 0xf]);
}
}
return sb;
}
char *serval_uuid_to_str(const serval_uuid_t *uuid, char *const dst)
{
strbuf b = strbuf_local(dst, SERVAL_UUID_STRLEN + 1);
strbuf_uuid(b, uuid);
assert(!strbuf_overrun(b));
2013-11-12 07:44:14 +00:00
return dst;
}
int str_to_serval_uuid(const char *const str, serval_uuid_t *uuid, const char **afterp)
{
const char *end = str;
int ret = 0;
if ( strn_fromhex(uuid->u.binary, 4, end, &end) == 4
&& *end == '-'
&& strn_fromhex(uuid->u.binary + 4, 2, end + 1, &end) == 2
&& *end == '-'
&& strn_fromhex(uuid->u.binary + 6, 2, end + 1, &end) == 2
&& *end == '-'
&& strn_fromhex(uuid->u.binary + 8, 2, end + 1, &end) == 2
&& *end == '-'
&& strn_fromhex(uuid->u.binary + 10, 6, end + 1, &end) == 6
) {
assert(end == str + SERVAL_UUID_STRLEN);
ret = serval_uuid_is_valid(uuid);
}
if (afterp)
*afterp = end;
if (ret == 0 || (!afterp && *end))
return 0;
return 1;
}