225 lines
6.2 KiB
C
225 lines
6.2 KiB
C
/*
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* Copyright (c) 2002 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/endian.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sbuf.h>
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#include <sys/socket.h>
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#include <sys/sysproto.h>
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#include <sys/systm.h>
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#include <sys/uuid.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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/*
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* See also:
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* http://www.opengroup.org/dce/info/draft-leach-uuids-guids-01.txt
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* http://www.opengroup.org/onlinepubs/009629399/apdxa.htm
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*
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* Note that the generator state is itself an UUID, but the time and clock
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* sequence fields are written in the native byte order.
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*/
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CTASSERT(sizeof(struct uuid) == 16);
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/* We use an alternative, more convenient representation in the generator. */
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struct uuid_private {
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union {
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uint64_t ll; /* internal. */
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struct {
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uint32_t low;
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uint16_t mid;
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uint16_t hi;
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} x;
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} time;
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uint16_t seq; /* Big-endian. */
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uint16_t node[UUID_NODE_LEN>>1];
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};
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CTASSERT(sizeof(struct uuid_private) == 16);
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static struct uuid_private uuid_last;
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static struct mtx uuid_mutex;
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MTX_SYSINIT(uuid_lock, &uuid_mutex, "UUID generator mutex lock", MTX_DEF);
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/*
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* Return the first MAC address we encounter or, if none was found,
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* construct a sufficiently random multicast address. We don't try
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* to return the same MAC address as previously returned. We always
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* generate a new multicast address if no MAC address exists in the
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* system.
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* It would be nice to know if 'ifnet' or any of its sub-structures
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* has been changed in any way. If not, we could simply skip the
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* scan and safely return the MAC address we returned before.
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*/
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static void
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uuid_node(uint16_t *node)
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{
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struct ifnet *ifp;
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struct ifaddr *ifa;
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struct sockaddr_dl *sdl;
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int i;
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/* XXX: lock ifnet. */
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TAILQ_FOREACH(ifp, &ifnet, if_link) {
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/* Walk the address list */
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TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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sdl = (struct sockaddr_dl*)ifa->ifa_addr;
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if (sdl != NULL && sdl->sdl_family == AF_LINK &&
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sdl->sdl_type == IFT_ETHER) {
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/* Got a MAC address. */
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bcopy(LLADDR(sdl), node, UUID_NODE_LEN);
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/* XXX: unlock ifnet. */
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return;
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}
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}
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}
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/* XXX: unlock ifnet. */
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for (i = 0; i < (UUID_NODE_LEN>>1); i++)
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node[i] = (uint16_t)arc4random();
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*((uint8_t*)node) |= 0x80;
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}
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/*
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* Get the current time as a 60 bit count of 100-nanosecond intervals
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* since 00:00:00.00, October 15,1582. We apply a magic offset to convert
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* the Unix time since 00:00:00.00, Januari 1, 1970 to the date of the
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* Gregorian reform to the Christian calendar.
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*/
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static uint64_t
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uuid_time(void)
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{
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struct bintime bt;
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uint64_t time = 0x01B21DD213814000LL;
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bintime(&bt);
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time += (uint64_t)bt.sec * 10000000LL;
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time += (10000000LL * (uint32_t)(bt.frac >> 32)) >> 32;
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return (time & ((1LL << 60) - 1LL));
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}
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#ifndef _SYS_SYSPROTO_H_
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struct uuidgen_args {
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struct uuid *store;
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int count;
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};
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#endif
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int
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uuidgen(struct thread *td, struct uuidgen_args *uap)
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{
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struct uuid_private uuid;
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uint64_t time;
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int error;
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/*
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* Limit the number of UUIDs that can be created at the same time
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* to some arbitrary number. This isn't really necessary, but I
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* like to have some sort of upper-bound that's less than 2G :-)
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* XXX needs to be tunable.
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*/
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if (uap->count < 1 || uap->count > 2048)
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return (EINVAL);
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/* XXX: pre-validate accessibility to the whole of the UUID store? */
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mtx_lock(&uuid_mutex);
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uuid_node(uuid.node);
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time = uuid_time();
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if (uuid_last.time.ll == 0LL || uuid_last.node[0] != uuid.node[0] ||
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uuid_last.node[1] != uuid.node[1] ||
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uuid_last.node[2] != uuid.node[2])
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uuid.seq = (uint16_t)arc4random() & 0x3fff;
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else if (uuid_last.time.ll >= time)
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uuid.seq = (uuid_last.seq + 1) & 0x3fff;
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else
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uuid.seq = uuid_last.seq;
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uuid_last = uuid;
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uuid_last.time.ll = (time + uap->count - 1) & ((1LL << 60) - 1LL);
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mtx_unlock(&uuid_mutex);
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/* Set sequence and variant and deal with byte order. */
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uuid.seq = htobe16(uuid.seq | 0x8000);
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/* XXX: this should copyout larger chunks at a time. */
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do {
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/* Set time and version (=1) and deal with byte order. */
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uuid.time.x.low = (uint32_t)time;
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uuid.time.x.mid = (uint16_t)(time >> 32);
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uuid.time.x.hi = ((uint16_t)(time >> 48) & 0xfff) | (1 << 12);
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error = copyout(&uuid, uap->store, sizeof(uuid));
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uap->store++;
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uap->count--;
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time++;
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} while (uap->count > 0 && !error);
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return (error);
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}
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int
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snprintf_uuid(char *buf, size_t sz, struct uuid *uuid)
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{
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struct uuid_private *id;
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int cnt;
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id = (struct uuid_private *)uuid;
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cnt = snprintf(buf, sz, "%08x-%04x-%04x-%04x-%04x%04x%04x",
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id->time.x.low, id->time.x.mid, id->time.x.hi, be16toh(id->seq),
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be16toh(id->node[0]), be16toh(id->node[1]), be16toh(id->node[2]));
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return (cnt);
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}
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int
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printf_uuid(struct uuid *uuid)
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{
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char buf[38];
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snprintf_uuid(buf, sizeof(buf), uuid);
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return (printf("%s", buf));
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}
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int
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sbuf_printf_uuid(struct sbuf *sb, struct uuid *uuid)
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{
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char buf[38];
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snprintf_uuid(buf, sizeof(buf), uuid);
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return (sbuf_printf(sb, "%s", buf));
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}
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