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139 lines
2.8 KiB
139 lines
2.8 KiB
/*
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* uuid_time.c --- Interpret the time field from a uuid. This program
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* violates the UUID abstraction barrier by reaching into the guts
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* of a UUID and interpreting it.
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*
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* Copyright (C) 1998, 1999 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU
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* Library General Public License.
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* %End-Header%
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <time.h>
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#include "uuidP.h"
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time_t uuid_time(const uuid_t uu, struct timeval *ret_tv)
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{
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struct uuid uuid;
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__u32 high;
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struct timeval tv;
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unsigned longlong clock_reg;
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uuid_unpack(uu, &uuid);
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high = uuid.time_mid | ((uuid.time_hi_and_version & 0xFFF) << 16);
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clock_reg = uuid.time_low | ((unsigned longlong) high << 32);
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clock_reg -= (((unsigned longlong) 0x01B21DD2) << 32) + 0x13814000;
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tv.tv_sec = clock_reg / 10000000;
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tv.tv_usec = (clock_reg % 10000000) / 10;
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if (ret_tv)
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*ret_tv = tv;
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return tv.tv_sec;
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}
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int uuid_type(const uuid_t uu)
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{
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struct uuid uuid;
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uuid_unpack(uu, &uuid);
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return ((uuid.time_hi_and_version >> 12) & 0xF);
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}
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int uuid_variant(const uuid_t uu)
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{
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struct uuid uuid;
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int var;
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uuid_unpack(uu, &uuid);
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var = uuid.clock_seq;
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if ((var & 0x8000) == 0)
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return UUID_VARIANT_NCS;
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if ((var & 0x4000) == 0)
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return UUID_VARIANT_DCE;
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if ((var & 0x2000) == 0)
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return UUID_VARIANT_MICROSOFT;
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return UUID_VARIANT_OTHER;
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}
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#ifdef DEBUG
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static const char *variant_string(int variant)
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{
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switch (variant) {
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case UUID_VARIANT_NCS:
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return "NCS";
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case UUID_VARIANT_DCE:
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return "DCE";
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case UUID_VARIANT_MICROSOFT:
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return "Microsoft";
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default:
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return "Other";
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}
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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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uuid_t buf;
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time_t time_reg;
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struct timeval tv;
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int type, variant;
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if (argc != 2) {
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fprintf(stderr, "Usage: %s uuid\n", argv[0]);
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exit(1);
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}
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if (uuid_parse(argv[1], buf)) {
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fprintf(stderr, "Invalid UUID: %s\n", argv[1]);
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exit(1);
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}
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variant = uuid_variant(buf);
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type = uuid_type(buf);
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time_reg = uuid_time(buf, &tv);
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printf("UUID variant is %d (%s)\n", variant, variant_string(variant));
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if (variant != UUID_VARIANT_DCE) {
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printf("Warning: This program only knows how to interpret "
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"DCE UUIDs.\n\tThe rest of the output is likely "
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"to be incorrect!!\n");
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}
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printf("UUID type is %d", type);
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switch (type) {
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case 1:
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printf(" (time based)\n");
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break;
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case 2:
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printf(" (DCE)\n");
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break;
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case 3:
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printf(" (name-based)\n");
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break;
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case 4:
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printf(" (random)\n");
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break;
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default:
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printf("\n");
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}
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if (type != 1) {
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printf("Warning: not a time-based UUID, so UUID time "
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"decoding will likely not work!\n");
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}
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printf("UUID time is: (%ld, %ld): %s\n", tv.tv_sec, tv.tv_usec,
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ctime(&time_reg));
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return 0;
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}
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#endif
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