[apple/libc.git] / uuid / gen_uuid-uuid.c

/*
 * 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%
 */

/*
 * Force inclusion of SVID stuff since we need it if we're compiling in
 * gcc-wall wall mode
 */
#define _SVID_SOURCE

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/file.h>
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#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"

/*
 * Generate a series of random bytes, using arc4random
 */
static void get_random_bytes(void *buf, int nbytes)
{
	unsigned char *cp = (unsigned char *) buf;
	u_int32_t u;
	int n = nbytes / sizeof(u);

	while (n-- > 0) {
		u = arc4random();
		memcpy(cp, &u, sizeof(u));
		cp += sizeof(u);
	}
	if ((n = nbytes % sizeof(u)) > 0) {
		u = arc4random();
		memcpy(cp, &u, n);
	}
	return;
}

/*
 * 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 AF_LINK
	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(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
#ifdef AF_LINK
		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 /* AF_LINK */
#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
 */
void uuid_generate(uuid_t out)
{
	uuid_generate_random(out);
}
Commit	Line	Data
224c7076 A	1	/*
	2	* gen_uuid.c --- generate a DCE-compatible uuid
	3	*
	4	* Copyright (C) 1996, 1997, 1998, 1999 Theodore Ts'o.
	5	*
	6	* %Begin-Header%
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	* 1. Redistributions of source code must retain the above copyright
	11	* notice, and the entire permission notice in its entirety,
	12	* including the disclaimer of warranties.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. The name of the author may not be used to endorse or promote
	17	* products derived from this software without specific prior
	18	* written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
	21	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	22	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
	23	* WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
	24	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	25	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
	26	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	27	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	28	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	29	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
	30	* USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
	31	* DAMAGE.
	32	* %End-Header%
	33	*/
	34
	35	/*
	36	* Force inclusion of SVID stuff since we need it if we're compiling in
	37	* gcc-wall wall mode
	38	*/
	39	#define _SVID_SOURCE
	40
	41	#ifdef HAVE_UNISTD_H
	42	#include <unistd.h>
	43	#endif
	44	#ifdef HAVE_STDLIB_H
	45	#include <stdlib.h>
	46	#endif
	47	#include <string.h>
	48	#include <fcntl.h>
	49	#include <errno.h>
	50	#include <sys/types.h>
	51	#include <sys/time.h>
	52	#include <sys/stat.h>
	53	#include <sys/file.h>
	54	#ifdef HAVE_SYS_IOCTL_H
	55	#include <sys/ioctl.h>
	56	#endif
	57	#ifdef HAVE_SYS_SOCKET_H
	58	#include <sys/socket.h>
	59	#endif
	60	#ifdef HAVE_SYS_SOCKIO_H
	61	#include <sys/sockio.h>
	62	#endif
	63	#ifdef HAVE_NET_IF_H
	64	#include <net/if.h>
65	#endif
66	#ifdef HAVE_NETINET_IN_H
67	#include <netinet/in.h>
68	#endif
69	#ifdef HAVE_NET_IF_DL_H
70	#include <net/if_dl.h>
71	#endif
72
73	#include "uuidP.h"
74
75	/*
76	* Generate a series of random bytes, using arc4random
77	*/
78	static void get_random_bytes(void *buf, int nbytes)
79	{
80	unsigned char cp = (unsigned char ) buf;
81	u_int32_t u;
82	int n = nbytes / sizeof(u);
83
84	while (n-- > 0) {
85	u = arc4random();
86	memcpy(cp, &u, sizeof(u));
87	cp += sizeof(u);
88	}
89	if ((n = nbytes % sizeof(u)) > 0) {
90	u = arc4random();
91	memcpy(cp, &u, n);
92	}
93	return;
94	}
95
96	/*
97	* Get the ethernet hardware address, if we can find it...
98	*/
99	static int get_node_id(unsigned char *node_id)
100	{
101	#ifdef HAVE_NET_IF_H
102	int sd;
103	struct ifreq ifr, *ifrp;
104	struct ifconf ifc;
105	char buf[1024];
106	int n, i;
107	unsigned char *a;
108	#ifdef AF_LINK
109	struct sockaddr_dl *sdlp;
110	#endif
111
112	/*
113	* BSD 4.4 defines the size of an ifreq to be
114	* max(sizeof(ifreq), sizeof(ifreq.ifr_name)+ifreq.ifr_addr.sa_len
115	* However, under earlier systems, sa_len isn't present, so the size is
116	* just sizeof(struct ifreq)
117	*/
118	#ifdef HAVE_SA_LEN
119	#ifndef max
120	#define max(a,b) ((a) > (b) ? (a) : (b))
121	#endif
122	#define ifreq_size(i) max(sizeof(struct ifreq),\
123	sizeof((i).ifr_name)+(i).ifr_addr.sa_len)
124	#else
125	#define ifreq_size(i) sizeof(struct ifreq)
126	#endif /* HAVE_SA_LEN*/
127
128	sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
129	if (sd < 0) {
130	return -1;
131	}
132	memset(buf, 0, sizeof(buf));
133	ifc.ifc_len = sizeof(buf);
134	ifc.ifc_buf = buf;
135	if (ioctl (sd, SIOCGIFCONF, (char *)&ifc) < 0) {
136	close(sd);
137	return -1;
138	}
139	n = ifc.ifc_len;
140	for (i = 0; i < n; i+= ifreq_size(*ifrp) ) {
141	ifrp = (struct ifreq )((char ) ifc.ifc_buf+i);
142	strncpy(ifr.ifr_name, ifrp->ifr_name, IFNAMSIZ);
143	#ifdef SIOCGIFHWADDR
144	if (ioctl(sd, SIOCGIFHWADDR, &ifr) < 0)
145	continue;
146	a = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
147	#else
148	#ifdef SIOCGENADDR
149	if (ioctl(sd, SIOCGENADDR, &ifr) < 0)
150	continue;
151	a = (unsigned char *) ifr.ifr_enaddr;
152	#else
153	#ifdef AF_LINK
154	sdlp = (struct sockaddr_dl *) &ifrp->ifr_addr;
155	if ((sdlp->sdl_family != AF_LINK) \|\| (sdlp->sdl_alen != 6))
156	continue;
157	a = (unsigned char *) &sdlp->sdl_data[sdlp->sdl_nlen];
158	#else
159	/*
160	* XXX we don't have a way of getting the hardware
161	* address
162	*/
163	close(sd);
164	return 0;
165	#endif /* AF_LINK */
166	#endif /* SIOCGENADDR */
167	#endif /* SIOCGIFHWADDR */
168	if (!a[0] && !a[1] && !a[2] && !a[3] && !a[4] && !a[5])
169	continue;
170	if (node_id) {
171	memcpy(node_id, a, 6);
172	close(sd);
173	return 1;
174	}
175	}
176	close(sd);
177	#endif
178	return 0;
179	}
180
181	/* Assume that the gettimeofday() has microsecond granularity */
182	#define MAX_ADJUSTMENT 10
183
184	static int get_clock(uint32_t clock_high, uint32_t clock_low, uint16_t *ret_clock_seq)
185	{
186	static int adjustment = 0;
187	static struct timeval last = {0, 0};
188	static uint16_t clock_seq;
189	struct timeval tv;
190	unsigned long long clock_reg;
191
192	try_again:
193	gettimeofday(&tv, 0);
194	if ((last.tv_sec == 0) && (last.tv_usec == 0)) {
195	get_random_bytes(&clock_seq, sizeof(clock_seq));
196	clock_seq &= 0x3FFF;
197	last = tv;
198	last.tv_sec--;
199	}
200	if ((tv.tv_sec < last.tv_sec) \|\|
201	((tv.tv_sec == last.tv_sec) &&
202	(tv.tv_usec < last.tv_usec))) {
203	clock_seq = (clock_seq+1) & 0x3FFF;
204	adjustment = 0;
205	last = tv;
206	} else if ((tv.tv_sec == last.tv_sec) &&
207	(tv.tv_usec == last.tv_usec)) {
208	if (adjustment >= MAX_ADJUSTMENT)
209	goto try_again;
210	adjustment++;
211	} else {
212	adjustment = 0;
213	last = tv;
214	}
215
216	clock_reg = tv.tv_usec*10 + adjustment;
217	clock_reg += ((unsigned long long) tv.tv_sec)*10000000;
218	clock_reg += (((unsigned long long) 0x01B21DD2) << 32) + 0x13814000;
219
220	*clock_high = clock_reg >> 32;
221	*clock_low = clock_reg;
222	*ret_clock_seq = clock_seq;
223	return 0;
224	}
225
226	void uuid_generate_time(uuid_t out)
227	{
228	static unsigned char node_id[6];
229	static int has_init = 0;
230	struct uuid uu;
231	uint32_t clock_mid;
232
233	if (!has_init) {
234	if (get_node_id(node_id) <= 0) {
235	get_random_bytes(node_id, 6);
236	/*
237	* Set multicast bit, to prevent conflicts
238	* with IEEE 802 addresses obtained from
239	* network cards
240	*/
241	node_id[0] \|= 0x01;
242	}
243	has_init = 1;
244	}
245	get_clock(&clock_mid, &uu.time_low, &uu.clock_seq);
246	uu.clock_seq \|= 0x8000;
247	uu.time_mid = (uint16_t) clock_mid;
248	uu.time_hi_and_version = ((clock_mid >> 16) & 0x0FFF) \| 0x1000;
249	memcpy(uu.node, node_id, 6);
250	uuid_pack(&uu, out);
251	}
252
253	void uuid_generate_random(uuid_t out)
254	{
255	uuid_t buf;
256	struct uuid uu;
257
258	get_random_bytes(buf, sizeof(buf));
259	uuid_unpack(buf, &uu);
260
261	uu.clock_seq = (uu.clock_seq & 0x3FFF) \| 0x8000;
262	uu.time_hi_and_version = (uu.time_hi_and_version & 0x0FFF) \| 0x4000;
263	uuid_pack(&uu, out);
264	}
265
266	/*
267	* This is the generic front-end
268	*/
269	void uuid_generate(uuid_t out)
270	{
271	uuid_generate_random(out);
272	}