old_e2fsprogs/uuid/gen_uuid.c

/* vi: set sw=4 ts=4: */
/*
 * gen_uuid.c --- generate a DCE-compatible uuid
 *
 * Copyright (C) 1996, 1997, 1998, 1999 Theodore Ts'o.
 *
 * %Begin-Header%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, and the entire permission notice in its entirety,
 *    including the disclaimer of warranties.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
 * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 * %End-Header%
 */

#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/time.h>
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#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
#ifdef HAVE_NET_IF_DL_H
#include <net/if_dl.h>
#endif

#include "uuidP.h"

#ifdef HAVE_SRANDOM
#define srand(x)	srandom(x)
#define rand()		random()
#endif

static int get_random_fd(void)
{
	struct timeval	tv;
	static int	fd = -2;
	int		i;

	if (fd == -2) {
		gettimeofday(&tv, 0);
		fd = open("/dev/urandom", O_RDONLY);
		if (fd == -1)
			fd = open("/dev/random", O_RDONLY | O_NONBLOCK);
		srand((getpid() << 16) ^ getuid() ^ tv.tv_sec ^ tv.tv_usec);
	}
	/* Crank the random number generator a few times */
	gettimeofday(&tv, 0);
	for (i = (tv.tv_sec ^ tv.tv_usec) & 0x1F; i > 0; i--)
		rand();
	return fd;
}


/*
 * 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)
{
	int i, n = nbytes, fd = get_random_fd();
	int lose_counter = 0;
	unsigned char *cp = (unsigned char *) buf;

	if (fd >= 0) {
		while (n > 0) {
			i = read(fd, cp, n);
			if (i <= 0) {
				if (lose_counter++ > 16)
					break;
				continue;
			}
			n -= i;
			cp += i;
			lose_counter = 0;
		}
	}

	/*
	 * We do this all the time, but this is the only source of
	 * randomness if /dev/random/urandom is out to lunch.
	 */
	for (cp = buf, i = 0; i < nbytes; i++)
		*cp++ ^= (rand() >> 7) & 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;
#ifdef HAVE_NET_IF_DL_H
	struct sockaddr_dl *sdlp;
#endif

/*
 * 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(*ifrp) ) {
		ifrp = (struct ifreq *)((char *) ifc.ifc_buf+i);
		strncpy_IFNAMSIZ(ifr.ifr_name, ifrp->ifr_name);
#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
#ifdef HAVE_NET_IF_DL_H
		sdlp = (struct sockaddr_dl *) &ifrp->ifr_addr;
		if ((sdlp->sdl_family != AF_LINK) || (sdlp->sdl_alen != 6))
			continue;
		a = (unsigned char *) &sdlp->sdl_data[sdlp->sdl_nlen];
#else
		/*
		 * XXX we don't have a way of getting the hardware
		 * address
		 */
		close(sd);
		return 0;
#endif /* HAVE_NET_IF_DL_H */
#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(uint32_t *clock_high, uint32_t *clock_low, uint16_t *ret_clock_seq)
{
	static int			adjustment = 0;
	static struct timeval		last = {0, 0};
	static uint16_t			clock_seq;
	struct timeval			tv;
	unsigned long long		clock_reg;

try_again:
	gettimeofday(&tv, 0);
	if ((last.tv_sec == 0) && (last.tv_usec == 0)) {
		get_random_bytes(&clock_seq, sizeof(clock_seq));
		clock_seq &= 0x3FFF;
		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) & 0x3FFF;
		adjustment = 0;
		last = tv;
	} 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;
		last = tv;
	}

	clock_reg = tv.tv_usec*10 + adjustment;
	clock_reg += ((unsigned long long) tv.tv_sec)*10000000;
	clock_reg += (((unsigned long long) 0x01B21DD2) << 32) + 0x13814000;

	*clock_high = clock_reg >> 32;
	*clock_low = clock_reg;
	*ret_clock_seq = clock_seq;
	return 0;
}

void uuid_generate_time(uuid_t out)
{
	static unsigned char node_id[6];
	static int has_init = 0;
	struct uuid uu;
	uint32_t	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] |= 0x01;
		}
		has_init = 1;
	}
	get_clock(&clock_mid, &uu.time_low, &uu.clock_seq);
	uu.clock_seq |= 0x8000;
	uu.time_mid = (uint16_t) clock_mid;
	uu.time_hi_and_version = ((clock_mid >> 16) & 0x0FFF) | 0x1000;
	memcpy(uu.node, node_id, 6);
	uuid_pack(&uu, out);
}

void uuid_generate_random(uuid_t out)
{
	uuid_t	buf;
	struct uuid uu;

	get_random_bytes(buf, sizeof(buf));
	uuid_unpack(buf, &uu);

	uu.clock_seq = (uu.clock_seq & 0x3FFF) | 0x8000;
	uu.time_hi_and_version = (uu.time_hi_and_version & 0x0FFF) | 0x4000;
	uuid_pack(&uu, out);
}

/*
 * This is the generic front-end to uuid_generate_random and
 * uuid_generate_time.  It uses uuid_generate_random only if
 * /dev/urandom is available, since otherwise we won't have
 * high-quality randomness.
 */
void uuid_generate(uuid_t out)
{
	if (get_random_fd() >= 0)
		uuid_generate_random(out);
	else
		uuid_generate_time(out);
}
1	niro	532	/* vi: set sw=4 ts=4: */
2			/*
3			* gen_uuid.c --- generate a DCE-compatible uuid
4			*
5			* Copyright (C) 1996, 1997, 1998, 1999 Theodore Ts'o.
6			*
7			* %Begin-Header%
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			* 1. Redistributions of source code must retain the above copyright
12			* notice, and the entire permission notice in its entirety,
13			* including the disclaimer of warranties.
14			* 2. Redistributions in binary form must reproduce the above copyright
15			* notice, this list of conditions and the following disclaimer in the
16			* documentation and/or other materials provided with the distribution.
17			* 3. The name of the author may not be used to endorse or promote
18			* products derived from this software without specific prior
19			* written permission.
20			*
21			* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22			* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
24			* WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
25			* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26			* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
27			* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28			* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29			* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
31			* USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
32			* DAMAGE.
33			* %End-Header%
34			*/
35
36			#include <unistd.h>
37			#include <stdlib.h>
38			#include <string.h>
39			#include <fcntl.h>
40			#include <errno.h>
41			#include <sys/types.h>
42			#include <sys/stat.h>
43			#include <sys/file.h>
44			#include <sys/time.h>
45			#ifdef HAVE_SYS_IOCTL_H
46			#include <sys/ioctl.h>
47			#endif
48			#include <sys/socket.h>
49			#ifdef HAVE_SYS_SOCKIO_H
50			#include <sys/sockio.h>
51			#endif
52			#ifdef HAVE_NET_IF_H
53			#include <net/if.h>
54			#endif
55			#ifdef HAVE_NETINET_IN_H
56			#include <netinet/in.h>
57			#endif
58			#ifdef HAVE_NET_IF_DL_H
59			#include <net/if_dl.h>
60			#endif
61
62			#include "uuidP.h"
63
64			#ifdef HAVE_SRANDOM
65			#define srand(x) srandom(x)
66			#define rand() random()
67			#endif
68
69			static int get_random_fd(void)
70			{
71			struct timeval tv;
72			static int fd = -2;
73			int i;
74
75			if (fd == -2) {
76			gettimeofday(&tv, 0);
77			fd = open("/dev/urandom", O_RDONLY);
78			if (fd == -1)
79			fd = open("/dev/random", O_RDONLY \| O_NONBLOCK);
80			srand((getpid() << 16) ^ getuid() ^ tv.tv_sec ^ tv.tv_usec);
81			}
82			/* Crank the random number generator a few times */
83			gettimeofday(&tv, 0);
84			for (i = (tv.tv_sec ^ tv.tv_usec) & 0x1F; i > 0; i--)
85			rand();
86			return fd;
87			}
88
89
90			/*
91			* Generate a series of random bytes. Use /dev/urandom if possible,
92			* and if not, use srandom/random.
93			*/
94			static void get_random_bytes(void *buf, int nbytes)
95			{
96			int i, n = nbytes, fd = get_random_fd();
97			int lose_counter = 0;
98			unsigned char cp = (unsigned char ) buf;
99
100			if (fd >= 0) {
101			while (n > 0) {
102			i = read(fd, cp, n);
103			if (i <= 0) {
104			if (lose_counter++ > 16)
105			break;
106			continue;
107			}
108			n -= i;
109			cp += i;
110			lose_counter = 0;
111			}
112			}
113
114			/*
115			* We do this all the time, but this is the only source of
116			* randomness if /dev/random/urandom is out to lunch.
117			*/
118			for (cp = buf, i = 0; i < nbytes; i++)
119			*cp++ ^= (rand() >> 7) & 0xFF;
120			}
121
122			/*
123			* Get the ethernet hardware address, if we can find it...
124			*/
125			static int get_node_id(unsigned char *node_id)
126			{
127			#ifdef HAVE_NET_IF_H
128			int sd;
129			struct ifreq ifr, *ifrp;
130			struct ifconf ifc;
131			char buf[1024];
132			int n, i;
133			unsigned char *a;
134			#ifdef HAVE_NET_IF_DL_H
135			struct sockaddr_dl *sdlp;
136			#endif
137
138			/*
139			* BSD 4.4 defines the size of an ifreq to be
140			* max(sizeof(ifreq), sizeof(ifreq.ifr_name)+ifreq.ifr_addr.sa_len
141			* However, under earlier systems, sa_len isn't present, so the size is
142			* just sizeof(struct ifreq)
143			*/
144			#ifdef HAVE_SA_LEN
145			#ifndef max
146			#define max(a,b) ((a) > (b) ? (a) : (b))
147			#endif
148			#define ifreq_size(i) max(sizeof(struct ifreq),\
149			sizeof((i).ifr_name)+(i).ifr_addr.sa_len)
150			#else
151			#define ifreq_size(i) sizeof(struct ifreq)
152			#endif /* HAVE_SA_LEN*/
153
154			sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
155			if (sd < 0) {
156			return -1;
157			}
158			memset(buf, 0, sizeof(buf));
159			ifc.ifc_len = sizeof(buf);
160			ifc.ifc_buf = buf;
161			if (ioctl (sd, SIOCGIFCONF, (char *)&ifc) < 0) {
162			close(sd);
163			return -1;
164			}
165			n = ifc.ifc_len;
166			for (i = 0; i < n; i+= ifreq_size(*ifrp) ) {
167			ifrp = (struct ifreq )((char ) ifc.ifc_buf+i);
168	niro	984	strncpy_IFNAMSIZ(ifr.ifr_name, ifrp->ifr_name);
169	niro	532	#ifdef SIOCGIFHWADDR
170			if (ioctl(sd, SIOCGIFHWADDR, &ifr) < 0)
171			continue;
172			a = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
173			#else
174			#ifdef SIOCGENADDR
175			if (ioctl(sd, SIOCGENADDR, &ifr) < 0)
176			continue;
177			a = (unsigned char *) ifr.ifr_enaddr;
178			#else
179			#ifdef HAVE_NET_IF_DL_H
180			sdlp = (struct sockaddr_dl *) &ifrp->ifr_addr;
181			if ((sdlp->sdl_family != AF_LINK) \|\| (sdlp->sdl_alen != 6))
182			continue;
183			a = (unsigned char *) &sdlp->sdl_data[sdlp->sdl_nlen];
184			#else
185			/*
186			* XXX we don't have a way of getting the hardware
187			* address
188			*/
189			close(sd);
190			return 0;
191			#endif /* HAVE_NET_IF_DL_H */
192			#endif /* SIOCGENADDR */
193			#endif /* SIOCGIFHWADDR */
194			if (!a[0] && !a[1] && !a[2] && !a[3] && !a[4] && !a[5])
195			continue;
196			if (node_id) {
197			memcpy(node_id, a, 6);
198			close(sd);
199			return 1;
200			}
201			}
202			close(sd);
203			#endif
204			return 0;
205			}
206
207			/* Assume that the gettimeofday() has microsecond granularity */
208			#define MAX_ADJUSTMENT 10
209
210			static int get_clock(uint32_t clock_high, uint32_t clock_low, uint16_t *ret_clock_seq)
211			{
212			static int adjustment = 0;
213			static struct timeval last = {0, 0};
214			static uint16_t clock_seq;
215			struct timeval tv;
216			unsigned long long clock_reg;
217
218			try_again:
219			gettimeofday(&tv, 0);
220			if ((last.tv_sec == 0) && (last.tv_usec == 0)) {
221			get_random_bytes(&clock_seq, sizeof(clock_seq));
222			clock_seq &= 0x3FFF;
223			last = tv;
224			last.tv_sec--;
225			}
226			if ((tv.tv_sec < last.tv_sec) \|\|
227			((tv.tv_sec == last.tv_sec) &&
228			(tv.tv_usec < last.tv_usec))) {
229			clock_seq = (clock_seq+1) & 0x3FFF;
230			adjustment = 0;
231			last = tv;
232			} else if ((tv.tv_sec == last.tv_sec) &&
233			(tv.tv_usec == last.tv_usec)) {
234			if (adjustment >= MAX_ADJUSTMENT)
235			goto try_again;
236			adjustment++;
237			} else {
238			adjustment = 0;
239			last = tv;
240			}
241
242			clock_reg = tv.tv_usec*10 + adjustment;
243			clock_reg += ((unsigned long long) tv.tv_sec)*10000000;
244			clock_reg += (((unsigned long long) 0x01B21DD2) << 32) + 0x13814000;
245
246			*clock_high = clock_reg >> 32;
247			*clock_low = clock_reg;
248			*ret_clock_seq = clock_seq;
249			return 0;
250			}
251
252			void uuid_generate_time(uuid_t out)
253			{
254			static unsigned char node_id[6];
255			static int has_init = 0;
256			struct uuid uu;
257			uint32_t clock_mid;
258
259			if (!has_init) {
260			if (get_node_id(node_id) <= 0) {
261			get_random_bytes(node_id, 6);
262			/*
263			* Set multicast bit, to prevent conflicts
264			* with IEEE 802 addresses obtained from
265			* network cards
266			*/
267			node_id[0] \|= 0x01;
268			}
269			has_init = 1;
270			}
271			get_clock(&clock_mid, &uu.time_low, &uu.clock_seq);
272			uu.clock_seq \|= 0x8000;
273			uu.time_mid = (uint16_t) clock_mid;
274			uu.time_hi_and_version = ((clock_mid >> 16) & 0x0FFF) \| 0x1000;
275			memcpy(uu.node, node_id, 6);
276			uuid_pack(&uu, out);
277			}
278
279			void uuid_generate_random(uuid_t out)
280			{
281			uuid_t buf;
282			struct uuid uu;
283
284			get_random_bytes(buf, sizeof(buf));
285			uuid_unpack(buf, &uu);
286
287			uu.clock_seq = (uu.clock_seq & 0x3FFF) \| 0x8000;
288			uu.time_hi_and_version = (uu.time_hi_and_version & 0x0FFF) \| 0x4000;
289			uuid_pack(&uu, out);
290			}
291
292			/*
293			* This is the generic front-end to uuid_generate_random and
294			* uuid_generate_time. It uses uuid_generate_random only if
295			* /dev/urandom is available, since otherwise we won't have
296			* high-quality randomness.
297			*/
298			void uuid_generate(uuid_t out)
299			{
300			if (get_random_fd() >= 0)
301			uuid_generate_random(out);
302			else
303			uuid_generate_time(out);
304			}