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📄 Make.tags.inc(2.13 KB)
📄 Makefile(302 B)
📄 bus_if.m(26.31 KB)
📄 capabilities.conf(13.67 KB)
📄 clock_if.m(1.7 KB)
📄 cpufreq_if.m(2.27 KB)
📄 device_if.m(10.41 KB)
📄 firmw.S(2.15 KB)
📄 genassym.sh(1.11 KB)
📄 genoffset.c(1.68 KB)
📄 genoffset.sh(3.58 KB)
📄 imgact_aout.c(9.45 KB)
📄 imgact_binmisc.c(18.64 KB)
📄 imgact_elf.c(76.32 KB)
📄 imgact_elf32.c(1.47 KB)
📄 imgact_elf64.c(1.47 KB)
📄 imgact_shell.c(8.41 KB)
📄 init_main.c(24.31 KB)
📄 init_sysent.c(95.3 KB)
📄 kern_acct.c(19.03 KB)
📄 kern_alq.c(24.97 KB)
📄 kern_clock.c(21.12 KB)
📄 kern_clocksource.c(23.34 KB)
📄 kern_condvar.c(11.28 KB)
📄 kern_conf.c(36.14 KB)
📄 kern_cons.c(15.75 KB)
📄 kern_context.c(3.59 KB)
📄 kern_cpu.c(30.77 KB)
📄 kern_cpuset.c(59.78 KB)
📄 kern_ctf.c(8.73 KB)
📄 kern_descrip.c(112.87 KB)
📄 kern_dtrace.c(2.94 KB)
📄 kern_dump.c(8.51 KB)
📄 kern_environment.c(22.75 KB)
📄 kern_et.c(7.1 KB)
📄 kern_event.c(62.49 KB)
📄 kern_exec.c(46.67 KB)
📄 kern_exit.c(34.61 KB)
📄 kern_fail.c(29.32 KB)
📄 kern_ffclock.c(12.66 KB)
📄 kern_fork.c(28.29 KB)
📄 kern_hhook.c(13.58 KB)
📄 kern_idle.c(2.74 KB)
📄 kern_intr.c(40.44 KB)
📄 kern_jail.c(112.67 KB)
📄 kern_kcov.c(15.32 KB)
📄 kern_khelp.c(9.45 KB)
📄 kern_kthread.c(11.8 KB)
📄 kern_ktr.c(11.93 KB)
📄 kern_ktrace.c(31.41 KB)
📄 kern_linker.c(54.3 KB)
📄 kern_lock.c(46.99 KB)
📄 kern_lockf.c(64.46 KB)
📄 kern_lockstat.c(3.8 KB)
📄 kern_loginclass.c(6.69 KB)
📄 kern_malloc.c(37.09 KB)
📄 kern_mbuf.c(43.16 KB)
📄 kern_mib.c(24.26 KB)
📄 kern_module.c(11.05 KB)
📄 kern_mtxpool.c(5.82 KB)
📄 kern_mutex.c(33.62 KB)
📄 kern_ntptime.c(32.49 KB)
📄 kern_osd.c(12.37 KB)
📄 kern_physio.c(5.74 KB)
📄 kern_pmc.c(8.89 KB)
📄 kern_poll.c(15.86 KB)
📄 kern_priv.c(9.14 KB)
📄 kern_proc.c(80.01 KB)
📄 kern_procctl.c(19.48 KB)
📄 kern_prot.c(57.94 KB)
📄 kern_racct.c(34.01 KB)
📄 kern_rangelock.c(8.67 KB)
📄 kern_rctl.c(53.87 KB)
📄 kern_resource.c(36.66 KB)
📄 kern_rmlock.c(28.27 KB)
📄 kern_rwlock.c(40.72 KB)
📄 kern_sdt.c(2.05 KB)
📄 kern_sema.c(4.85 KB)
📄 kern_sendfile.c(33.97 KB)
📄 kern_sharedpage.c(10.37 KB)
📄 kern_shutdown.c(43.34 KB)
📄 kern_sig.c(101.89 KB)
📄 kern_switch.c(13.85 KB)
📄 kern_sx.c(40.27 KB)
📄 kern_synch.c(18.17 KB)
📄 kern_syscalls.c(6.74 KB)
📄 kern_sysctl.c(67.24 KB)
📄 kern_tc.c(55.73 KB)
📄 kern_thr.c(14.14 KB)
📄 kern_thread.c(41.75 KB)
📄 kern_time.c(40.89 KB)
📄 kern_timeout.c(43.08 KB)
📄 kern_tslog.c(3.44 KB)
📄 kern_ubsan.c(50.74 KB)
📄 kern_umtx.c(107.14 KB)
📄 kern_uuid.c(11.68 KB)
📄 kern_xxx.c(10.44 KB)
📄 ksched.c(6.56 KB)
📄 link_elf.c(47.99 KB)
📄 link_elf_obj.c(44.41 KB)
📄 linker_if.m(3.96 KB)
📄 makesyscalls.sh(23.57 KB)
📄 md4c.c(7.89 KB)
📄 md5c.c(9.56 KB)
📄 msi_if.m(2.48 KB)
📄 p1003_1b.c(8.84 KB)
📄 pic_if.m(3.9 KB)
📄 posix4_mib.c(5.59 KB)
📄 sched_4bsd.c(45.03 KB)
📄 sched_ule.c(82.65 KB)
📄 serdev_if.m(3.49 KB)
📄 stack_protector.c(613 B)
📄 subr_acl_nfs4.c(37.42 KB)
📄 subr_acl_posix1e.c(17.71 KB)
📄 subr_atomic64.c(3.97 KB)
📄 subr_autoconf.c(7.7 KB)
📄 subr_blist.c(31.88 KB)
📄 subr_boot.c(5.8 KB)
📄 subr_bufring.c(2.21 KB)
📄 subr_bus.c(145.4 KB)
📄 subr_bus_dma.c(19.67 KB)
📄 subr_busdma_bufalloc.c(5.24 KB)
📄 subr_capability.c(11.93 KB)
📄 subr_clock.c(10.61 KB)
📄 subr_compressor.c(13.11 KB)
📄 subr_counter.c(4.44 KB)
📄 subr_coverage.c(6.17 KB)
📄 subr_csan.c(25.39 KB)
📄 subr_devmap.c(9.8 KB)
📄 subr_devstat.c(16.21 KB)
📄 subr_disk.c(8.54 KB)
📄 subr_dummy_vdso_tc.c(1.7 KB)
📄 subr_early.c(2.26 KB)
📄 subr_epoch.c(25.02 KB)
📄 subr_eventhandler.c(9.17 KB)
📄 subr_fattime.c(9.98 KB)
📄 subr_filter.c(12.2 KB)
📄 subr_firmware.c(13.88 KB)
📄 subr_gtaskqueue.c(20.19 KB)
📄 subr_hash.c(4.8 KB)
📄 subr_hints.c(12.87 KB)
📄 subr_intr.c(40.61 KB)
📄 subr_kdb.c(16.13 KB)
📄 subr_kobj.c(7.1 KB)
📄 subr_lock.c(18.81 KB)
📄 subr_log.c(7.64 KB)
📄 subr_mchain.c(11.06 KB)
📄 subr_module.c(12.98 KB)
📄 subr_msgbuf.c(10.6 KB)
📄 subr_param.c(10.93 KB)
📄 subr_pcpu.c(10.18 KB)
📄 subr_pctrie.c(20.99 KB)
📄 subr_physmem.c(11.52 KB)
📄 subr_pidctrl.c(5.43 KB)
📄 subr_power.c(3.13 KB)
📄 subr_prf.c(27.42 KB)
📄 subr_prng.c(3.36 KB)
📄 subr_prof.c(15.43 KB)
📄 subr_rangeset.c(8.5 KB)
📄 subr_rman.c(27.61 KB)
📄 subr_rtc.c(11.42 KB)
📄 subr_sbuf.c(20.53 KB)
📄 subr_scanf.c(15.59 KB)
📄 subr_sfbuf.c(6.17 KB)
📄 subr_sglist.c(22.83 KB)
📄 subr_sleepqueue.c(39.43 KB)
📄 subr_smp.c(31.62 KB)
📄 subr_smr.c(20.17 KB)
📄 subr_stack.c(6.47 KB)
📄 subr_stats.c(103.01 KB)
📄 subr_syscall.c(7.98 KB)
📄 subr_taskqueue.c(21.1 KB)
📄 subr_terminal.c(15.52 KB)
📄 subr_trap.c(10.87 KB)
📄 subr_turnstile.c(35.58 KB)
📄 subr_uio.c(11.38 KB)
📄 subr_unit.c(22.97 KB)
📄 subr_vmem.c(43.25 KB)
📄 subr_witness.c(84.59 KB)
📄 sys_capability.c(15.06 KB)
📄 sys_eventfd.c(8.42 KB)
📄 sys_generic.c(44.22 KB)
📄 sys_getrandom.c(4.21 KB)
📄 sys_pipe.c(45.14 KB)
📄 sys_procdesc.c(14.57 KB)
📄 sys_process.c(30.73 KB)
📄 sys_socket.c(20.11 KB)
📄 syscalls.c(22.73 KB)
📄 syscalls.master(60.26 KB)
📄 systrace_args.c(178.49 KB)
📄 sysv_ipc.c(6.53 KB)
📄 sysv_msg.c(48.65 KB)
📄 sysv_sem.c(49.85 KB)
📄 sysv_shm.c(43.93 KB)
📄 tty.c(55.14 KB)
📄 tty_compat.c(11.46 KB)
📄 tty_info.c(9.93 KB)
📄 tty_inq.c(12.22 KB)
📄 tty_outq.c(8.74 KB)
📄 tty_pts.c(19.74 KB)
📄 tty_tty.c(2.83 KB)
📄 tty_ttydisc.c(28.6 KB)
📄 uipc_accf.c(8.07 KB)
📄 uipc_debug.c(12.42 KB)
📄 uipc_domain.c(13.13 KB)
📄 uipc_ktls.c(55.7 KB)
📄 uipc_mbuf.c(52.45 KB)
📄 uipc_mbuf2.c(12.64 KB)
📄 uipc_mbufhash.c(4.9 KB)
📄 uipc_mqueue.c(64.64 KB)
📄 uipc_sem.c(25.18 KB)
📄 uipc_shm.c(50.47 KB)
📄 uipc_sockbuf.c(42.9 KB)
📄 uipc_socket.c(110.61 KB)
📄 uipc_syscalls.c(35.94 KB)
📄 uipc_usrreq.c(75.11 KB)
📄 vfs_acl.c(14.5 KB)
📄 vfs_aio.c(76.32 KB)
📄 vfs_bio.c(145.39 KB)
📄 vfs_cache.c(143.09 KB)
📄 vfs_cluster.c(28.36 KB)
📄 vfs_default.c(33.16 KB)
📄 vfs_export.c(14.55 KB)
📄 vfs_extattr.c(17.91 KB)
📄 vfs_hash.c(6 KB)
📄 vfs_init.c(15.86 KB)
📄 vfs_lookup.c(45.48 KB)
📄 vfs_mount.c(62.58 KB)
📄 vfs_mountroot.c(26.23 KB)
📄 vfs_subr.c(167.52 KB)
📄 vfs_syscalls.c(106.86 KB)
📄 vfs_vnops.c(86.28 KB)
📄 vnode_if.src(13.66 KB)

Editing: kern_uuid.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2002 Marcel Moolenaar
 * All rights reserved.
 *
 * 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, this list of conditions and the following disclaimer.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 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 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sbuf.h>
#include <sys/socket.h>
#include <sys/sysproto.h>
#include <sys/systm.h>
#include <sys/jail.h>
#include <sys/uuid.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/vnet.h>

/*
 * See also:
 *	http://www.opengroup.org/dce/info/draft-leach-uuids-guids-01.txt
 *	http://www.opengroup.org/onlinepubs/009629399/apdxa.htm
 *
 * Note that the generator state is itself an UUID, but the time and clock
 * sequence fields are written in the native byte order.
 */

CTASSERT(sizeof(struct uuid) == 16);

/* We use an alternative, more convenient representation in the generator. */
struct uuid_private {
	union {
		uint64_t	ll;	/* internal, for uuid_last only */
		struct {
			uint32_t	low;
			uint16_t	mid;
			uint16_t	hi;
		} x;
	} time;
	uint16_t	seq;			/* Big-endian. */
	uint16_t	node[UUID_NODE_LEN>>1];
};

CTASSERT(sizeof(struct uuid_private) == 16);

struct uuid_macaddr {
	uint16_t	state;
#define	UUID_ETHER_EMPTY	0
#define	UUID_ETHER_RANDOM	1
#define	UUID_ETHER_UNIQUE	2
	uint16_t	node[UUID_NODE_LEN>>1];
};

static struct uuid_private uuid_last;

#define UUID_NETHER	4
static struct uuid_macaddr uuid_ether[UUID_NETHER];

static struct mtx uuid_mutex;
MTX_SYSINIT(uuid_lock, &uuid_mutex, "UUID generator mutex lock", MTX_DEF);

/*
 * Return the first MAC address added in the array. If it's empty, then
 * construct a sufficiently random multicast MAC address first. Any
 * addresses added later will bump the random MAC address up tp the next
 * index.
 */
static void
uuid_node(uint16_t *node)
{
	int i;

if (uuid_ether[0].state == UUID_ETHER_EMPTY) {
		for (i = 0; i < (UUID_NODE_LEN>>1); i++)
			uuid_ether[0].node[i] = (uint16_t)arc4random();
		*((uint8_t*)uuid_ether[0].node) |= 0x01;
		uuid_ether[0].state = UUID_ETHER_RANDOM;
	}
	for (i = 0; i < (UUID_NODE_LEN>>1); i++)
		node[i] = uuid_ether[0].node[i];
}

/*
 * Get the current time as a 60 bit count of 100-nanosecond intervals
 * since 00:00:00.00, October 15,1582. We apply a magic offset to convert
 * the Unix time since 00:00:00.00, January 1, 1970 to the date of the
 * Gregorian reform to the Christian calendar.
 */
static uint64_t
uuid_time(void)
{
	struct bintime bt;
	uint64_t time = 0x01B21DD213814000LL;

bintime(&bt);
	time += (uint64_t)bt.sec * 10000000LL;
	time += (10000000LL * (uint32_t)(bt.frac >> 32)) >> 32;
	return (time & ((1LL << 60) - 1LL));
}

struct uuid *
kern_uuidgen(struct uuid *store, size_t count)
{
	struct uuid_private uuid;
	uint64_t time;
	size_t n;

mtx_lock(&uuid_mutex);

uuid_node(uuid.node);
	time = uuid_time();

if (uuid_last.time.ll == 0LL || uuid_last.node[0] != uuid.node[0] ||
	    uuid_last.node[1] != uuid.node[1] ||
	    uuid_last.node[2] != uuid.node[2])
		uuid.seq = (uint16_t)arc4random() & 0x3fff;
	else if (uuid_last.time.ll >= time)
		uuid.seq = (uuid_last.seq + 1) & 0x3fff;
	else
		uuid.seq = uuid_last.seq;

uuid_last = uuid;
	uuid_last.time.ll = (time + count - 1) & ((1LL << 60) - 1LL);

mtx_unlock(&uuid_mutex);

/* Set sequence and variant and deal with byte order. */
	uuid.seq = htobe16(uuid.seq | 0x8000);

for (n = 0; n < count; n++) {
		/* Set time and version (=1). */
		uuid.time.x.low = (uint32_t)time;
		uuid.time.x.mid = (uint16_t)(time >> 32);
		uuid.time.x.hi = ((uint16_t)(time >> 48) & 0xfff) | (1 << 12);
		store[n] = *(struct uuid *)&uuid;
		time++;
	}

return (store);
}

#ifndef _SYS_SYSPROTO_H_
struct uuidgen_args {
	struct uuid *store;
	int	count;
};
#endif
int
sys_uuidgen(struct thread *td, struct uuidgen_args *uap)
{
	struct uuid *store;
	size_t count;
	int error;

/*
	 * Limit the number of UUIDs that can be created at the same time
	 * to some arbitrary number. This isn't really necessary, but I
	 * like to have some sort of upper-bound that's less than 2G :-)
	 * XXX probably needs to be tunable.
	 */
	if (uap->count < 1 || uap->count > 2048)
		return (EINVAL);

count = uap->count;
	store = malloc(count * sizeof(struct uuid), M_TEMP, M_WAITOK);
	kern_uuidgen(store, count);
	error = copyout(store, uap->store, count * sizeof(struct uuid));
	free(store, M_TEMP);
	return (error);
}

int
uuid_ether_add(const uint8_t *addr)
{
	int i, sum;

/*
	 * Validate input. No multicast (flag 0x1), no locally administered
	 * (flag 0x2) and no 'all-zeroes' addresses.
	 */
	if (addr[0] & 0x03)
		return (EINVAL);
	sum = 0;
	for (i = 0; i < UUID_NODE_LEN; i++)
		sum += addr[i];
	if (sum == 0)
		return (EINVAL);

mtx_lock(&uuid_mutex);

/* Make sure the MAC isn't known already and that there's space. */
	i = 0;
	while (i < UUID_NETHER && uuid_ether[i].state == UUID_ETHER_UNIQUE) {
		if (!bcmp(addr, uuid_ether[i].node, UUID_NODE_LEN)) {
			mtx_unlock(&uuid_mutex);
			return (EEXIST);
		}
		i++;
	}
	if (i == UUID_NETHER) {
		mtx_unlock(&uuid_mutex);
		return (ENOSPC);
	}

/* Insert MAC at index, moving the non-empty entry if possible. */
	if (uuid_ether[i].state == UUID_ETHER_RANDOM && i < UUID_NETHER - 1)
		uuid_ether[i + 1] = uuid_ether[i];
	uuid_ether[i].state = UUID_ETHER_UNIQUE;
	bcopy(addr, uuid_ether[i].node, UUID_NODE_LEN);
	mtx_unlock(&uuid_mutex);
	return (0);
}

int
uuid_ether_del(const uint8_t *addr)
{
	int i;

mtx_lock(&uuid_mutex);
	i = 0;
	while (i < UUID_NETHER && uuid_ether[i].state == UUID_ETHER_UNIQUE &&
	    bcmp(addr, uuid_ether[i].node, UUID_NODE_LEN))
		i++;
	if (i == UUID_NETHER || uuid_ether[i].state != UUID_ETHER_UNIQUE) {
		mtx_unlock(&uuid_mutex);
		return (ENOENT);
	}

/* Remove it by shifting higher index entries down. */
	while (i < UUID_NETHER - 1 && uuid_ether[i].state != UUID_ETHER_EMPTY) {
		uuid_ether[i] = uuid_ether[i + 1];
		i++;
	}
	if (uuid_ether[i].state != UUID_ETHER_EMPTY) {
		uuid_ether[i].state = UUID_ETHER_EMPTY;
		bzero(uuid_ether[i].node, UUID_NODE_LEN);
	}
	mtx_unlock(&uuid_mutex);
	return (0);
}

int
snprintf_uuid(char *buf, size_t sz, struct uuid *uuid)
{
	struct uuid_private *id;
	int cnt;

id = (struct uuid_private *)uuid;
	cnt = snprintf(buf, sz, "%08x-%04x-%04x-%04x-%04x%04x%04x",
	    id->time.x.low, id->time.x.mid, id->time.x.hi, be16toh(id->seq),
	    be16toh(id->node[0]), be16toh(id->node[1]), be16toh(id->node[2]));
	return (cnt);
}

int
printf_uuid(struct uuid *uuid)
{
	char buf[38];

snprintf_uuid(buf, sizeof(buf), uuid);
	return (printf("%s", buf));
}

int
sbuf_printf_uuid(struct sbuf *sb, struct uuid *uuid)
{
	char buf[38];

snprintf_uuid(buf, sizeof(buf), uuid);
	return (sbuf_cat(sb, buf));
}

/*
 * Encode/Decode UUID into byte-stream.
 *   http://www.opengroup.org/dce/info/draft-leach-uuids-guids-01.txt
 *
 * 0                   1                   2                   3
 *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *  |                          time_low                             |
 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *  |       time_mid                |         time_hi_and_version   |
 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *  |clk_seq_hi_res |  clk_seq_low  |         node (0-1)            |
 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *  |                         node (2-5)                            |
 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 */

void
le_uuid_enc(void *buf, struct uuid const *uuid)
{
	u_char *p;
	int i;

p = buf;
	le32enc(p, uuid->time_low);
	le16enc(p + 4, uuid->time_mid);
	le16enc(p + 6, uuid->time_hi_and_version);
	p[8] = uuid->clock_seq_hi_and_reserved;
	p[9] = uuid->clock_seq_low;
	for (i = 0; i < _UUID_NODE_LEN; i++)
		p[10 + i] = uuid->node[i];
}

void
le_uuid_dec(void const *buf, struct uuid *uuid)
{
	u_char const *p;
	int i;

p = buf;
	uuid->time_low = le32dec(p);
	uuid->time_mid = le16dec(p + 4);
	uuid->time_hi_and_version = le16dec(p + 6);
	uuid->clock_seq_hi_and_reserved = p[8];
	uuid->clock_seq_low = p[9];
	for (i = 0; i < _UUID_NODE_LEN; i++)
		uuid->node[i] = p[10 + i];
}

void
be_uuid_enc(void *buf, struct uuid const *uuid)
{
	u_char *p;
	int i;

p = buf;
	be32enc(p, uuid->time_low);
	be16enc(p + 4, uuid->time_mid);
	be16enc(p + 6, uuid->time_hi_and_version);
	p[8] = uuid->clock_seq_hi_and_reserved;
	p[9] = uuid->clock_seq_low;
	for (i = 0; i < _UUID_NODE_LEN; i++)
		p[10 + i] = uuid->node[i];
}

void
be_uuid_dec(void const *buf, struct uuid *uuid)
{
	u_char const *p;
	int i;

p = buf;
	uuid->time_low = be32dec(p);
	uuid->time_mid = be16dec(p + 4);
	uuid->time_hi_and_version = be16dec(p + 6);
	uuid->clock_seq_hi_and_reserved = p[8];
	uuid->clock_seq_low = p[9];
	for (i = 0; i < _UUID_NODE_LEN; i++)
		uuid->node[i] = p[10 + i];
}

int
validate_uuid(const char *str, size_t size, struct uuid *uuid, int flags)
{
	u_int c[11];
	int n;

if (size == 0 || *str == '\0') {
		/* An empty string may represent a nil UUID. */
		if ((flags & VUUIDF_EMPTYOK) != 0) {
			if (uuid != NULL)
				bzero(uuid, sizeof(*uuid));
			return (0);
		}

return (EINVAL);
	}

/* The UUID string representation has a fixed length. */
	if (size != 36)
		return (EINVAL);

/*
	 * We only work with "new" UUIDs. New UUIDs have the form:
	 *      01234567-89ab-cdef-0123-456789abcdef
	 * The so called "old" UUIDs, which we don't support, have the form:
	 *      0123456789ab.cd.ef.01.23.45.67.89.ab
	 */
	if (str[8] != '-')
		return (EINVAL);

/* Now check the format. */
	n = sscanf(str, "%8x-%4x-%4x-%2x%2x-%2x%2x%2x%2x%2x%2x", c + 0, c + 1,
	    c + 2, c + 3, c + 4, c + 5, c + 6, c + 7, c + 8, c + 9, c + 10);
	/* Make sure we have all conversions. */
	if (n != 11)
		return (EINVAL);

/* Successful scan. Build the UUID if requested. */
	if (uuid != NULL) {
		uuid->time_low = c[0];
		uuid->time_mid = c[1];
		uuid->time_hi_and_version = c[2];
		uuid->clock_seq_hi_and_reserved = c[3];
		uuid->clock_seq_low = c[4];
		for (n = 0; n < 6; n++)
			uuid->node[n] = c[n + 5];
	}

if ((flags & VUUIDF_CHECKSEMANTICS) == 0)
		return (0);

return (((c[3] & 0x80) != 0x00 &&		/* variant 0? */
	    (c[3] & 0xc0) != 0x80 &&			/* variant 1? */
	    (c[3] & 0xe0) != 0xc0) ? EINVAL : 0);	/* variant 2? */
}

#define	VUUIDF_PARSEFLAGS	(VUUIDF_EMPTYOK | VUUIDF_CHECKSEMANTICS)

int
parse_uuid(const char *str, struct uuid *uuid)
{

return (validate_uuid(str, strlen(str), uuid, VUUIDF_PARSEFLAGS));
}

int
uuidcmp(const struct uuid *uuid1, const struct uuid *uuid2)
{

return (memcmp(uuid1, uuid2, sizeof(struct uuid)));
}

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