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/* sysdep.c
* UUID system dependent routines
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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.
*/
/*
** Copyright (c) 1990- 1993, 1996 Open Software Foundation, Inc.
** Copyright (c) 1989 by Hewlett-Packard Company, Palo Alto, Ca. &
** Digital Equipment Corporation, Maynard, Mass.
** Copyright (c) 1998 Microsoft.
** To anyone who acknowledges that this file is provided "AS IS"
** without any express or implied warranty: permission to use, copy,
** modify, and distribute this file for any purpose is hereby
** granted without fee, provided that the above copyright notices and
** this notice appears in all source code copies, and that none of
** the names of Open Software Foundation, Inc., Hewlett-Packard
** Company, Microsoft, or Digital Equipment Corporation be used in
** advertising or publicity pertaining to distribution of the software
** without specific, written prior permission. Neither Open Software
** Foundation, Inc., Hewlett-Packard Company, Microsoft, nor Digital
** Equipment Corporation makes any representations about the
** suitability of this software for any purpose.
*/
#include <stdio.h>
#include "sysdep.h"
/* system dependent call to get IEEE node ID.
This sample implementation generates a random node ID. */
void get_ieee_node_identifier(uuid_node_t *node)
{
static inited = 0;
static uuid_node_t saved_node;
char seed[16];
FILE *fp;
if (!inited) {
fp = fopen("nodeid", "rb");
if (fp) {
fread(&saved_node, sizeof saved_node, 1, fp);
fclose(fp);
}
else {
get_random_info(seed);
seed[0] |= 0x01;
memcpy(&saved_node, seed, sizeof saved_node);
fp = fopen("nodeid", "wb");
if (fp) {
fwrite(&saved_node, sizeof saved_node, 1, fp);
fclose(fp);
}
}
inited = 1;
}
*node = saved_node;
}
/* system dependent call to get the current system time. Returned as
100ns ticks since UUID epoch, but resolution may be less than
100ns. */
#ifdef _WINDOWS_
void get_system_time(uuid_time_t *uuid_time)
{
ULARGE_INTEGER time;
/* NT keeps time in FILETIME format which is 100ns ticks since
Jan 1, 1601. UUIDs use time in 100ns ticks since Oct 15, 1582.
The difference is 17 Days in Oct + 30 (Nov) + 31 (Dec)
+ 18 years and 5 leap days. */
GetSystemTimeAsFileTime((FILETIME *)&time);
time.QuadPart +=
(unsigned __int64) (1000*1000*10) /* seconds */
* (unsigned __int64) (60 * 60 * 24) /* days */
* (unsigned __int64) (17+30+31+365*18+5); /* # of days */
*uuid_time = time.QuadPart;
}
/* Sample code, not for use in production; see RFC 1750 */
void get_random_info(char seed[16])
{
MD5_CTX c;
struct {
MEMORYSTATUS m;
SYSTEM_INFO s;
FILETIME t;
LARGE_INTEGER pc;
DWORD tc;
DWORD l;
char hostname[MAX_COMPUTERNAME_LENGTH + 1];
} r;
MD5Init(&c);
GlobalMemoryStatus(&r.m);
GetSystemInfo(&r.s);
GetSystemTimeAsFileTime(&r.t);
QueryPerformanceCounter(&r.pc);
r.tc = GetTickCount();
r.l = MAX_COMPUTERNAME_LENGTH + 1;
GetComputerNameA(r.hostname, &r.l);
MD5Update(&c, &r, sizeof r);
MD5Final(seed, &c);
}
#else
void get_system_time(uuid_time_t *uuid_time)
{
struct timeval tp;
gettimeofday(&tp, (struct timezone *)0);
/* Offset between UUID formatted times and Unix formatted times.
UUID UTC base time is October 15, 1582.
Unix base time is January 1, 1970.*/
*uuid_time = ((unsigned64)tp.tv_sec * 10000000)
+ ((unsigned64)tp.tv_usec * 10)
+ I64(0x01B21DD213814000);
}
/* Sample code, not for use in production; see RFC 1750 */
void get_random_info(char seed[16])
{
MD5_CTX c;
struct {
struct sysinfo s;
struct timeval t;
char hostname[257];
} r;
MD5Init(&c);
sysinfo(&r.s);
gettimeofday(&r.t, (struct timezone *)0);
gethostname(r.hostname, 256);
MD5Update(&c, &r, sizeof r);
MD5Final(seed, &c);
}
#endif
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