mirror of https://github.com/vitalif/e2fsprogs
213 lines
4.6 KiB
C
213 lines
4.6 KiB
C
/*
|
|
* gen_uuid.c --- generate a DCE-compatible uuid
|
|
*
|
|
* Copyright (C) 1996, 1997 Theodore Ts'o.
|
|
*
|
|
* %Begin-Header%
|
|
* This file may be redistributed under the terms of the GNU Public
|
|
* License.
|
|
* %End-Header%
|
|
*/
|
|
|
|
#ifdef HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
#ifdef HAVE_STDLIB_H
|
|
#include <stdlib.h>
|
|
#endif
|
|
#include <string.h>
|
|
#include <fcntl.h>
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/file.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
#ifdef HAVE_SYS_SOCKIO_H
|
|
#include <sys/sockio.h>
|
|
#endif
|
|
#ifdef HAVE_NET_IF_H
|
|
#include <net/if.h>
|
|
#endif
|
|
#ifdef HAVE_NETINET_IN_H
|
|
#include <netinet/in.h>
|
|
#endif
|
|
|
|
#include "uuidP.h"
|
|
|
|
#ifdef HAVE_SRANDOM
|
|
#define srand(x) srandom(x)
|
|
#define rand() random()
|
|
#endif
|
|
|
|
/*
|
|
* Generate a series of random bytes. Use /dev/urandom if possible,
|
|
* and if not, use srandom/random.
|
|
*/
|
|
static void get_random_bytes(void *buf, int nbytes)
|
|
{
|
|
static int fd = -2;
|
|
int i;
|
|
char *cp = (char *) buf;
|
|
|
|
if (fd == -2) {
|
|
fd = open("/dev/urandom", O_RDONLY);
|
|
srand((getpid() << 16) ^ getuid() ^ time(0));
|
|
}
|
|
if (fd > 0) {
|
|
i = read(fd, cp, nbytes);
|
|
if (i == nbytes)
|
|
return;
|
|
if (i > 0) {
|
|
nbytes -= i;
|
|
cp += i;
|
|
}
|
|
}
|
|
for (i=0; i < nbytes; i++)
|
|
*cp++ = rand() & 0xFF;
|
|
}
|
|
|
|
/*
|
|
* Get the ethernet hardware address, if we can find it...
|
|
*/
|
|
static int get_node_id(unsigned char *node_id)
|
|
{
|
|
#ifdef HAVE_NET_IF_H
|
|
int sd;
|
|
struct ifreq ifr, *ifrp;
|
|
struct ifconf ifc;
|
|
char buf[1024];
|
|
int n, i;
|
|
unsigned char *a;
|
|
|
|
/*
|
|
* BSD 4.4 defines the size of an ifreq to be
|
|
* max(sizeof(ifreq), sizeof(ifreq.ifr_name)+ifreq.ifr_addr.sa_len
|
|
* However, under earlier systems, sa_len isn't present, so the size is
|
|
* just sizeof(struct ifreq)
|
|
*/
|
|
#ifdef HAVE_SA_LEN
|
|
#ifndef max
|
|
#define max(a,b) ((a) > (b) ? (a) : (b))
|
|
#endif
|
|
#define ifreq_size(i) max(sizeof(struct ifreq),\
|
|
sizeof((i).ifr_name)+(i).ifr_addr.sa_len)
|
|
#else
|
|
#define ifreq_size(i) sizeof(struct ifreq)
|
|
#endif /* HAVE_SA_LEN*/
|
|
|
|
sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
|
|
if (sd < 0) {
|
|
return -1;
|
|
}
|
|
memset(buf, 0, sizeof(buf));
|
|
ifc.ifc_len = sizeof(buf);
|
|
ifc.ifc_buf = buf;
|
|
if (ioctl (sd, SIOCGIFCONF, (char *)&ifc) < 0) {
|
|
close(sd);
|
|
return -1;
|
|
}
|
|
n = ifc.ifc_len;
|
|
for (i = 0; i < n; i+= ifreq_size(*ifr) ) {
|
|
ifrp = (struct ifreq *)((caddr_t) ifc.ifc_buf+i);
|
|
strncpy(ifr.ifr_name, ifrp->ifr_name, IFNAMSIZ);
|
|
#ifdef SIOCGIFHWADDR
|
|
if (ioctl(sd, SIOCGIFHWADDR, &ifr) < 0)
|
|
continue;
|
|
a = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
|
|
#else
|
|
#ifdef SIOCGENADDR
|
|
if (ioctl(sd, SIOCGENADDR, &ifr) < 0)
|
|
continue;
|
|
a = (unsigned char *) ifr.ifr_enaddr;
|
|
#else
|
|
/*
|
|
* XXX we don't have a way of getting the hardware
|
|
* address
|
|
*/
|
|
close(sd);
|
|
return 0;
|
|
#endif /* SIOCGENADDR */
|
|
#endif /* SIOCGIFHWADDR */
|
|
if (!a[0] && !a[1] && !a[2] && !a[3] && !a[4] && !a[5])
|
|
continue;
|
|
if (node_id) {
|
|
memcpy(node_id, a, 6);
|
|
close(sd);
|
|
return 1;
|
|
}
|
|
}
|
|
close(sd);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/* Assume that the gettimeofday() has microsecond granularity */
|
|
#define MAX_ADJUSTMENT 10
|
|
|
|
static int get_clock(__u32 *clock_high, __u32 *clock_low, __u16 *ret_clock_seq)
|
|
{
|
|
static int adjustment = 0;
|
|
static struct timeval last = {0, 0};
|
|
static __u16 clock_seq;
|
|
struct timeval tv;
|
|
unsigned long long clock;
|
|
|
|
try_again:
|
|
gettimeofday(&tv, 0);
|
|
if ((last.tv_sec == 0) && (last.tv_usec == 0)) {
|
|
get_random_bytes(&clock_seq, sizeof(clock_seq));
|
|
clock_seq &= 0x1FFF;
|
|
last = tv;
|
|
last.tv_sec--;
|
|
}
|
|
if ((tv.tv_sec < last.tv_sec) ||
|
|
((tv.tv_sec == last.tv_sec) &&
|
|
(tv.tv_usec < last.tv_usec))) {
|
|
clock_seq = (clock_seq+1) & 0x1FFF;
|
|
adjustment = 0;
|
|
} else if ((tv.tv_sec == last.tv_sec) &&
|
|
(tv.tv_usec == last.tv_usec)) {
|
|
if (adjustment >= MAX_ADJUSTMENT)
|
|
goto try_again;
|
|
adjustment++;
|
|
} else
|
|
adjustment = 0;
|
|
|
|
clock = tv.tv_usec*10 + adjustment;
|
|
clock += ((unsigned long long) tv.tv_sec)*10000000;
|
|
clock += (((unsigned long long) 0x01B21DD2) << 32) + 0x13814000;
|
|
|
|
*clock_high = clock >> 32;
|
|
*clock_low = clock;
|
|
*ret_clock_seq = clock_seq;
|
|
return 0;
|
|
}
|
|
|
|
void uuid_generate(uuid_t out)
|
|
{
|
|
static unsigned char node_id[6];
|
|
static int has_init = 0;
|
|
struct uuid uu;
|
|
__u32 clock_mid;
|
|
|
|
if (!has_init) {
|
|
if (get_node_id(node_id) <= 0) {
|
|
get_random_bytes(node_id, 6);
|
|
/*
|
|
* Set multicast bit, to prevent conflicts
|
|
* with IEEE 802 addresses obtained from
|
|
* network cards
|
|
*/
|
|
node_id[0] |= 0x80;
|
|
}
|
|
has_init = 1;
|
|
}
|
|
get_clock(&clock_mid, &uu.time_low, &uu.clock_seq);
|
|
uu.clock_seq |= 0x8000;
|
|
uu.time_mid = (__u16) clock_mid;
|
|
uu.time_hi_and_version = (clock_mid >> 16) | 0x1000;
|
|
memcpy(uu.node, node_id, 6);
|
|
uuid_pack(&uu, out);
|
|
}
|