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openldap/libraries/liblutil/uuid.c
Kurt Zeilenga 327880b984 Notice updates
2003-11-25 23:17:08 +00:00

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/* uuid.c -- Universally Unique Identifier routines */
/* $OpenLDAP$
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2000-2003 The OpenLDAP Foundation.
* Portions Copyright 2000-2003 Kurt D. Zeilenga.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
/* Portions Copyright 2000, John E. Schimmel, All rights reserved.
* This software is not subject to any license of Mirapoint, Inc.
*
* This is free software; you can redistribute and use it
* under the same terms as OpenLDAP itself.
*/
/* This work was initially developed by John E. Schimmel and adapted
* for inclusion in OpenLDAP Software by Kurt D. Zeilenga.
*/
/*
* Sorry this file is so scary, but it needs to run on a wide range of
* platforms. The only exported routine is lutil_uuidstr() which is all
* that LDAP cares about. It generates a new uuid and returns it in
* in string form.
*/
#include "portable.h"
#include <limits.h>
#include <stdio.h>
#include <sys/types.h>
#include <ac/stdlib.h>
#include <ac/string.h> /* get memcmp() */
#ifdef HAVE_UUID_TO_STR
# include <sys/uuid.h>
#elif defined( _WIN32 )
# include <rpc.h>
#else
# include <ac/socket.h>
# include <ac/time.h>
# ifdef HAVE_SYS_SYSCTL_H
# include <net/if.h>
# include <sys/sysctl.h>
# include <net/route.h>
# endif
#endif
#include <lutil.h>
/* not needed for Windows */
#if !defined(HAVE_UUID_TO_STR) && !defined(_WIN32)
static unsigned char *
lutil_eaddr( void )
{
static unsigned char zero[6];
static unsigned char eaddr[6];
#ifdef HAVE_SYS_SYSCTL_H
size_t needed;
int mib[6];
char *buf, *next, *lim;
struct if_msghdr *ifm;
struct sockaddr_dl *sdl;
if (memcmp(eaddr, zero, sizeof(eaddr))) {
return eaddr;
}
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[3] = 0;
mib[3] = 0;
mib[4] = NET_RT_IFLIST;
mib[5] = 0;
if (sysctl(mib, sizeof(mib), NULL, &needed, NULL, 0) < 0) {
return NULL;
}
buf = malloc(needed);
if( buf == NULL ) return NULL;
if (sysctl(mib, sizeof(mib), buf, &needed, NULL, 0) < 0) {
free(buf);
return NULL;
}
lim = buf + needed;
for (next = buf; next < lim; next += ifm->ifm_msglen) {
ifm = (struct if_msghdr *)next;
sdl = (struct sockaddr_dl *)(ifm + 1);
if ( sdl->sdl_family != AF_LINK || sdl->sdl_alen == 6 ) {
AC_MEMCPY(eaddr,
(unsigned char *)sdl->sdl_data + sdl->sdl_nlen,
sizeof(eaddr));
free(buf);
return eaddr;
}
}
free(buf);
return NULL;
#elif defined( SIOCGIFADDR ) && defined( AFLINK )
char buf[sizeof(struct ifreq) * 32];
struct ifconf ifc;
struct ifreq *ifr;
struct sockaddr *sa;
struct sockaddr_dl *sdl;
unsigned char *p;
int s, i;
if (memcmp(eaddr, zero, sizeof(eaddr))) {
return eaddr;
}
s = socket( AF_INET, SOCK_DGRAM, 0 );
if ( s < 0 ) {
return NULL;
}
ifc.ifc_len = sizeof( buf );
ifc.ifc_buf = buf;
memset( buf, 0, sizeof( buf ) );
i = ioctl( s, SIOCGIFCONF, (char *)&ifc );
close( s );
if( i < 0 ) {
return NULL;
}
for ( i = 0; i < ifc.ifc_len; ) {
ifr = (struct ifreq *)&ifc.ifc_buf[i];
sa = &ifr->ifr_addr;
if ( sa->sa_len > sizeof( ifr->ifr_addr ) ) {
i += sizeof( ifr->ifr_name ) + sa->sa_len;
} else {
i += sizeof( *ifr );
}
if ( sa->sa_family != AF_LINK ) {
continue;
}
sdl = (struct sockaddr_dl *)sa;
if ( sdl->sdl_alen == 6 ) {
AC_MEMCPY(eaddr,
(unsigned char *)sdl->sdl_data + sdl->sdl_nlen,
sizeof(eaddr));
return eaddr;
}
}
return NULL;
#else
if (memcmp(eaddr, zero, sizeof(eaddr)) == 0) {
/* XXX - who knows? */
lutil_entropy( eaddr, sizeof(eaddr) );
eaddr[0] |= 0x80; /* turn it into a multicast address */
}
return eaddr;
#endif
}
#if (ULONG_MAX >> 31 >> 31) > 1 || defined HAVE_LONG_LONG
#if (ULONG_MAX >> 31 >> 31) > 1
typedef unsigned long UI64;
/* 100 usec intervals from 10/10/1582 to 1/1/1970 */
# define UUID_TPLUS 0x01B21DD2138140ul
#else
typedef unsigned long long UI64;
# define UUID_TPLUS 0x01B21DD2138140ull
#endif
#define high32(i) ((unsigned long) ((i) >> 32))
#define low32(i) ((unsigned long) (i) & 0xFFFFFFFFul)
#define set_add64(res, i) ((res) += (i))
#define set_add64l(res, i) ((res) += (i))
#define mul64ll(i1, i2) ((UI64) (i1) * (i2))
#else /* ! (ULONG_MAX >= 64 bits || HAVE_LONG_LONG) */
typedef struct {
unsigned long high, low;
} UI64;
static const UI64 UUID_TPLUS = { 0x01B21Dul, 0xD2138140ul };
#define high32(i) ((i).high)
#define low32(i) ((i).low)
/* res += ui64 */
#define set_add64(res, ui64) \
{ \
res.high += ui64.high; \
res.low = (res.low + ui64.low) & 0xFFFFFFFFul; \
if (res.low < ui64.low) res.high++; \
}
/* res += ul32 */
#define set_add64l(res, ul32) \
{ \
res.low = (res.low + ul32) & 0xFFFFFFFFul; \
if (res.low < ul32) res.high++; \
}
/* compute i1 * i2 */
static UI64
mul64ll(unsigned long i1, unsigned long i2)
{
const unsigned int high1 = (i1 >> 16), low1 = (i1 & 0xffff);
const unsigned int high2 = (i2 >> 16), low2 = (i2 & 0xffff);
UI64 res;
unsigned long tmp;
res.high = (unsigned long) high1 * high2;
res.low = (unsigned long) low1 * low2;
tmp = (unsigned long) low1 * high2;
res.high += (tmp >> 16);
tmp = (tmp << 16) & 0xFFFFFFFFul;
res.low = (res.low + tmp) & 0xFFFFFFFFul;
if (res.low < tmp)
res.high++;
tmp = (unsigned long) low2 * high1;
res.high += (tmp >> 16);
tmp = (tmp << 16) & 0xFFFFFFFFul;
res.low = (res.low + tmp) & 0xFFFFFFFFul;
if (res.low < tmp)
res.high++;
return res;
}
#endif /* ULONG_MAX >= 64 bits || HAVE_LONG_LONG */
#endif /* !HAVE_UUID_TO_STR && !_WIN32 */
/*
** All we really care about is an ISO UUID string. The format of a UUID is:
** field octet note
** time_low 0-3 low field of the timestamp
** time_mid 4-5 middle field of timestamp
** time_hi_and_version 6-7 high field of timestamp and
** version number
** clock_seq_hi_and_resv 8 high field of clock sequence
** and variant
** clock_seq_low 9 low field of clock sequence
** node 10-15 spacially unique identifier
**
** We use DCE version one, and the DCE variant. Our unique identifier is
** the first ethernet address on the system.
*/
size_t
lutil_uuidstr( char *buf, size_t len )
{
#ifdef HAVE_UUID_TO_STR
uuid_t uu = {0};
unsigned rc;
char *s;
size_t l;
uuid_create( &uu, &rc );
if ( rc != uuid_s_ok ) {
return 0;
}
uuid_to_str( &uu, &s, &rc );
if ( rc != uuid_s_ok ) {
return 0;
}
l = strlen( s );
if ( l >= len ) {
free( s );
return 0;
}
strncpy( buf, s, len );
free( s );
return l;
#elif defined( _WIN32 )
UUID uuid;
unsigned char *uuidstr;
size_t uuidlen;
if( UuidCreate( &uuid ) != RPC_S_OK ) {
return 0;
}
if( UuidToString( &uuid, &uuidstr ) != RPC_S_OK ) {
return 0;
}
uuidlen = strlen( uuidstr );
if( uuidlen >= len ) {
return 0;
}
strncpy( buf, uuidstr, len );
RpcStringFree( &uuidstr );
return uuidlen;
#else
struct timeval tv;
UI64 tl;
unsigned char *nl;
unsigned short t2, t3, s1;
unsigned long t1, tl_high;
unsigned int rc;
/*
* Theoretically we should delay if seq wraps within 100usec but for now
* systems are not fast enough to worry about it.
*/
static int inited = 0;
static unsigned short seq;
if (!inited) {
lutil_entropy( (unsigned char *) &seq, sizeof(seq) );
inited++;
}
#ifdef HAVE_GETTIMEOFDAY
gettimeofday( &tv, 0 );
#else
time( &tv.tv_sec );
tv.tv_usec = 0;
#endif
tl = mul64ll(tv.tv_sec, 10000000UL);
set_add64l(tl, tv.tv_usec * 10UL);
set_add64(tl, UUID_TPLUS);
nl = lutil_eaddr();
t1 = low32(tl); /* time_low */
tl_high = high32(tl);
t2 = tl_high & 0xffff; /* time_mid */
t3 = ((tl_high >> 16) & 0x0fff) | 0x1000; /* time_hi_and_version */
s1 = ( ++seq & 0x1fff ) | 0x8000; /* clock_seq_and_reserved */
rc = snprintf( buf, len,
"%08lx-%04x-%04x-%04x-%02x%02x%02x%02x%02x%02x",
t1, (unsigned) t2, (unsigned) t3, (unsigned) s1,
(unsigned) nl[0], (unsigned) nl[1],
(unsigned) nl[2], (unsigned) nl[3],
(unsigned) nl[4], (unsigned) nl[5] );
return rc < len ? rc : 0;
#endif
}
#ifdef TEST
int
main(int argc, char **argv)
{
char buf1[8], buf2[64];
#ifndef HAVE_UUID_TO_STR
unsigned char *p = lutil_eaddr();
if( p ) {
printf( "Ethernet Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
(unsigned) p[0], (unsigned) p[1], (unsigned) p[2],
(unsigned) p[3], (unsigned) p[4], (unsigned) p[5]);
}
#endif
if ( lutil_uuidstr( buf1, sizeof( buf1 ) ) ) {
printf( "UUID: %s\n", buf1 );
} else {
fprintf( stderr, "too short: %ld\n", (long) sizeof( buf1 ) );
}
if ( lutil_uuidstr( buf2, sizeof( buf2 ) ) ) {
printf( "UUID: %s\n", buf2 );
} else {
fprintf( stderr, "too short: %ld\n", (long) sizeof( buf2 ) );
}
if ( lutil_uuidstr( buf2, sizeof( buf2 ) ) ) {
printf( "UUID: %s\n", buf2 );
} else {
fprintf( stderr, "too short: %ld\n", (long) sizeof( buf2 ) );
}
return 0;
}
#endif
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