695 lines
16 KiB
C
695 lines
16 KiB
C
/*
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* gen_uuid.c --- generate a DCE-compatible uuid
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*
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* Copyright (C) 1996, 1997, 1998, 1999 Theodore Ts'o.
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*
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* %Begin-Header%
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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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* 1. Redistributions of source code must retain the above copyright
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* notice, and the entire permission notice in its entirety,
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* including the disclaimer of warranties.
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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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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
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* WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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* %End-Header%
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*/
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/*
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* Force inclusion of SVID stuff since we need it if we're compiling in
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* gcc-wall wall mode
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*/
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#define _SVID_SOURCE
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#define _DEFAULT_SOURCE /* since glibc 2.20 _SVID_SOURCE is deprecated */
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#include "config.h"
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#ifdef _WIN32
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#define _WIN32_WINNT 0x0500
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#include <windows.h>
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#define UUID MYUUID
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#endif
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#include <stdio.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#include <sys/stat.h>
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#ifdef HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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#ifdef HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_SYS_UN_H
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#include <sys/un.h>
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#endif
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#ifdef HAVE_SYS_SOCKIO_H
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#include <sys/sockio.h>
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#endif
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#ifdef HAVE_NET_IF_H
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#include <net/if.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_NET_IF_DL_H
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#include <net/if_dl.h>
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#endif
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#if defined(__linux__) && defined(HAVE_SYS_SYSCALL_H)
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#include <sys/syscall.h>
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#endif
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#ifdef HAVE_SYS_RESOURCE_H
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#include <sys/resource.h>
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#endif
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#include "uuidP.h"
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#include "uuidd.h"
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#ifdef HAVE_SRANDOM
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#define srand(x) srandom(x)
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#define rand() random()
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#endif
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#ifdef TLS
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#define THREAD_LOCAL static TLS
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#else
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#define THREAD_LOCAL static
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#endif
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#if defined(__linux__) && defined(__NR_gettid) && defined(HAVE_JRAND48)
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#define DO_JRAND_MIX
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THREAD_LOCAL unsigned short jrand_seed[3];
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#endif
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#ifdef _WIN32
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#ifndef USE_MINGW
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static void gettimeofday (struct timeval *tv, void *dummy)
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{
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FILETIME ftime;
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uint64_t n;
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GetSystemTimeAsFileTime (&ftime);
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n = (((uint64_t) ftime.dwHighDateTime << 32)
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+ (uint64_t) ftime.dwLowDateTime);
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if (n) {
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n /= 10;
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n -= ((369 * 365 + 89) * (uint64_t) 86400) * 1000000;
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}
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tv->tv_sec = n / 1000000;
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tv->tv_usec = n % 1000000;
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}
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#endif
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#endif
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static int get_random_fd(void)
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{
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struct timeval tv;
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static int fd = -2;
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int i;
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if (fd == -2) {
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gettimeofday(&tv, 0);
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#ifndef _WIN32
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fd = open("/dev/urandom", O_RDONLY);
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if (fd == -1)
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fd = open("/dev/random", O_RDONLY | O_NONBLOCK);
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if (fd >= 0) {
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i = fcntl(fd, F_GETFD);
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if (i >= 0)
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fcntl(fd, F_SETFD, i | FD_CLOEXEC);
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}
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#endif
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srand(((unsigned)getpid() << 16) ^ getuid() ^ tv.tv_sec ^ tv.tv_usec);
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#ifdef DO_JRAND_MIX
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jrand_seed[0] = getpid() ^ (tv.tv_sec & 0xFFFF);
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jrand_seed[1] = getppid() ^ (tv.tv_usec & 0xFFFF);
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jrand_seed[2] = (tv.tv_sec ^ tv.tv_usec) >> 16;
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#endif
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}
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/* Crank the random number generator a few times */
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gettimeofday(&tv, 0);
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for (i = (tv.tv_sec ^ tv.tv_usec) & 0x1F; i > 0; i--)
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rand();
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return fd;
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}
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/*
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* Generate a series of random bytes. Use /dev/urandom if possible,
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* and if not, use srandom/random.
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*/
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static void get_random_bytes(void *buf, int nbytes)
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{
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int i, n = nbytes, fd = get_random_fd();
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int lose_counter = 0;
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unsigned char *cp = buf;
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if (fd >= 0) {
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while (n > 0) {
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i = read(fd, cp, n);
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if (i <= 0) {
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if (lose_counter++ > 16)
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break;
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continue;
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}
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n -= i;
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cp += i;
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lose_counter = 0;
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}
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}
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/*
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* We do this all the time, but this is the only source of
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* randomness if /dev/random/urandom is out to lunch.
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*/
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for (cp = buf, i = 0; i < nbytes; i++)
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*cp++ ^= (rand() >> 7) & 0xFF;
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#ifdef DO_JRAND_MIX
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{
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unsigned short tmp_seed[3];
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memcpy(tmp_seed, jrand_seed, sizeof(tmp_seed));
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jrand_seed[2] = jrand_seed[2] ^ syscall(__NR_gettid);
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for (cp = buf, i = 0; i < nbytes; i++)
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*cp++ ^= (jrand48(tmp_seed) >> 7) & 0xFF;
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memcpy(jrand_seed, tmp_seed,
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sizeof(jrand_seed) - sizeof(unsigned short));
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}
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#endif
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return;
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}
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/*
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* Get the ethernet hardware address, if we can find it...
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*
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* XXX for a windows version, probably should use GetAdaptersInfo:
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* http://www.codeguru.com/cpp/i-n/network/networkinformation/article.php/c5451
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* commenting out get_node_id just to get gen_uuid to compile under windows
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* is not the right way to go!
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*/
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static int get_node_id(unsigned char *node_id)
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{
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#ifdef HAVE_NET_IF_H
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int sd;
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struct ifreq ifr, *ifrp;
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struct ifconf ifc;
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char buf[1024];
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int n, i;
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unsigned char *a;
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#ifdef HAVE_NET_IF_DL_H
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struct sockaddr_dl *sdlp;
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#endif
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/*
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* BSD 4.4 defines the size of an ifreq to be
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* max(sizeof(ifreq), sizeof(ifreq.ifr_name)+ifreq.ifr_addr.sa_len
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* However, under earlier systems, sa_len isn't present, so the size is
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* just sizeof(struct ifreq)
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*/
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#ifdef HAVE_SA_LEN
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#ifndef max
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#define max(a,b) ((a) > (b) ? (a) : (b))
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#endif
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#define ifreq_size(i) max(sizeof(struct ifreq),\
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sizeof((i).ifr_name)+(i).ifr_addr.sa_len)
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#else
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#define ifreq_size(i) sizeof(struct ifreq)
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#endif /* HAVE_SA_LEN*/
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sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
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if (sd < 0) {
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return -1;
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}
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memset(buf, 0, sizeof(buf));
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ifc.ifc_len = sizeof(buf);
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ifc.ifc_buf = buf;
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if (ioctl (sd, SIOCGIFCONF, (char *)&ifc) < 0) {
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close(sd);
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return -1;
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}
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n = ifc.ifc_len;
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for (i = 0; i < n; i+= ifreq_size(*ifrp) ) {
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ifrp = (struct ifreq *)((char *) ifc.ifc_buf+i);
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strncpy(ifr.ifr_name, ifrp->ifr_name, IFNAMSIZ);
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#ifdef SIOCGIFHWADDR
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if (ioctl(sd, SIOCGIFHWADDR, &ifr) < 0)
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continue;
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a = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
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#else
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#ifdef SIOCGENADDR
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if (ioctl(sd, SIOCGENADDR, &ifr) < 0)
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continue;
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a = (unsigned char *) ifr.ifr_enaddr;
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#else
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#ifdef HAVE_NET_IF_DL_H
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sdlp = (struct sockaddr_dl *) &ifrp->ifr_addr;
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if ((sdlp->sdl_family != AF_LINK) || (sdlp->sdl_alen != 6))
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continue;
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a = (unsigned char *) &sdlp->sdl_data[sdlp->sdl_nlen];
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#else
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/*
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* XXX we don't have a way of getting the hardware
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* address
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*/
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close(sd);
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return 0;
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#endif /* HAVE_NET_IF_DL_H */
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#endif /* SIOCGENADDR */
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#endif /* SIOCGIFHWADDR */
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if (!a[0] && !a[1] && !a[2] && !a[3] && !a[4] && !a[5])
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continue;
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if (node_id) {
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memcpy(node_id, a, 6);
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close(sd);
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return 1;
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}
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}
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close(sd);
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#endif
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return 0;
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}
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/* Assume that the gettimeofday() has microsecond granularity */
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#define MAX_ADJUSTMENT 10
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static int get_clock(uint32_t *clock_high, uint32_t *clock_low,
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uint16_t *ret_clock_seq, int *num)
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{
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THREAD_LOCAL int adjustment = 0;
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THREAD_LOCAL struct timeval last = {0, 0};
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THREAD_LOCAL int state_fd = -2;
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THREAD_LOCAL FILE *state_f;
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THREAD_LOCAL uint16_t clock_seq;
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struct timeval tv;
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#ifndef _WIN32
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struct flock fl;
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#endif
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uint64_t clock_reg;
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mode_t save_umask;
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int len;
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if (state_fd == -2) {
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save_umask = umask(0);
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state_fd = open("/var/lib/libuuid/clock.txt",
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O_RDWR|O_CREAT, 0660);
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(void) umask(save_umask);
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if (state_fd >= 0) {
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state_f = fdopen(state_fd, "r+");
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if (!state_f) {
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close(state_fd);
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state_fd = -1;
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}
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}
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}
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#ifndef _WIN32
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fl.l_type = F_WRLCK;
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fl.l_whence = SEEK_SET;
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fl.l_start = 0;
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fl.l_len = 0;
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fl.l_pid = 0;
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if (state_fd >= 0) {
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rewind(state_f);
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while (fcntl(state_fd, F_SETLKW, &fl) < 0) {
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if ((errno == EAGAIN) || (errno == EINTR))
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continue;
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fclose(state_f);
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state_fd = -1;
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break;
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}
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}
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#endif
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if (state_fd >= 0) {
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unsigned int cl;
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unsigned long tv1, tv2;
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int a;
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if (fscanf(state_f, "clock: %04x tv: %lu %lu adj: %d\n",
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&cl, &tv1, &tv2, &a) == 4) {
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clock_seq = cl & 0x3FFF;
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last.tv_sec = tv1;
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last.tv_usec = tv2;
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adjustment = a;
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}
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}
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if ((last.tv_sec == 0) && (last.tv_usec == 0)) {
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get_random_bytes(&clock_seq, sizeof(clock_seq));
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clock_seq &= 0x3FFF;
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gettimeofday(&last, 0);
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last.tv_sec--;
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}
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try_again:
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gettimeofday(&tv, 0);
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if ((tv.tv_sec < last.tv_sec) ||
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((tv.tv_sec == last.tv_sec) &&
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(tv.tv_usec < last.tv_usec))) {
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clock_seq = (clock_seq+1) & 0x3FFF;
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adjustment = 0;
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last = tv;
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} else if ((tv.tv_sec == last.tv_sec) &&
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(tv.tv_usec == last.tv_usec)) {
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if (adjustment >= MAX_ADJUSTMENT)
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goto try_again;
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adjustment++;
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} else {
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adjustment = 0;
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last = tv;
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}
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clock_reg = tv.tv_usec*10 + adjustment;
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clock_reg += ((uint64_t) tv.tv_sec)*10000000;
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clock_reg += (((uint64_t) 0x01B21DD2) << 32) + 0x13814000;
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if (num && (*num > 1)) {
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adjustment += *num - 1;
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last.tv_usec += adjustment / 10;
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adjustment = adjustment % 10;
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last.tv_sec += last.tv_usec / 1000000;
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last.tv_usec = last.tv_usec % 1000000;
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}
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if (state_fd > 0) {
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rewind(state_f);
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len = fprintf(state_f,
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"clock: %04x tv: %016lu %08lu adj: %08d\n",
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clock_seq, (unsigned long)last.tv_sec,
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(unsigned long)last.tv_usec, adjustment);
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fflush(state_f);
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if (ftruncate(state_fd, len) < 0) {
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fprintf(state_f, " \n");
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fflush(state_f);
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}
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rewind(state_f);
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#ifndef _WIN32
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fl.l_type = F_UNLCK;
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if (fcntl(state_fd, F_SETLK, &fl) < 0) {
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fclose(state_f);
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state_fd = -1;
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}
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#endif
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}
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*clock_high = clock_reg >> 32;
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*clock_low = clock_reg;
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*ret_clock_seq = clock_seq;
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return 0;
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}
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#if defined(USE_UUIDD) && defined(HAVE_SYS_UN_H)
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static ssize_t read_all(int fd, char *buf, size_t count)
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{
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ssize_t ret;
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ssize_t c = 0;
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int tries = 0;
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memset(buf, 0, count);
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while (count > 0) {
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ret = read(fd, buf, count);
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if (ret <= 0) {
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if ((errno == EAGAIN || errno == EINTR || ret == 0) &&
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(tries++ < 5))
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continue;
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return c ? c : -1;
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}
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if (ret > 0)
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tries = 0;
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count -= ret;
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buf += ret;
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c += ret;
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}
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return c;
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}
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/*
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* Close all file descriptors
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*/
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static void close_all_fds(void)
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{
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int i, max;
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#if defined(HAVE_SYSCONF) && defined(_SC_OPEN_MAX)
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max = sysconf(_SC_OPEN_MAX);
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#elif defined(HAVE_GETDTABLESIZE)
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max = getdtablesize();
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#elif defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
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struct rlimit rl;
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getrlimit(RLIMIT_NOFILE, &rl);
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max = rl.rlim_cur;
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#else
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max = OPEN_MAX;
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#endif
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for (i=0; i < max; i++) {
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close(i);
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if (i <= 2)
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open("/dev/null", O_RDWR);
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}
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}
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#endif /* defined(USE_UUIDD) && defined(HAVE_SYS_UN_H) */
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#if __GNUC_PREREQ (4, 6)
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#pragma GCC diagnostic push
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#if !defined(USE_UUIDD) || !defined(HAVE_SYS_UN_H)
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#pragma GCC diagnostic ignored "-Wunused-parameter"
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#endif
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#endif
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/*
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* Try using the uuidd daemon to generate the UUID
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*
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* Returns 0 on success, non-zero on failure.
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*/
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static int get_uuid_via_daemon(int op, uuid_t out, int *num)
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{
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#if defined(USE_UUIDD) && defined(HAVE_SYS_UN_H)
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char op_buf[64];
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int op_len;
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int s;
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ssize_t ret;
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int32_t reply_len = 0, expected = 16;
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struct sockaddr_un srv_addr;
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struct stat st;
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pid_t pid;
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static const char *uuidd_path = UUIDD_PATH;
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static int access_ret = -2;
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static int start_attempts = 0;
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|
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
|
|
return -1;
|
|
|
|
srv_addr.sun_family = AF_UNIX;
|
|
strcpy(srv_addr.sun_path, UUIDD_SOCKET_PATH);
|
|
|
|
if (connect(s, (const struct sockaddr *) &srv_addr,
|
|
sizeof(struct sockaddr_un)) < 0) {
|
|
if (access_ret == -2)
|
|
access_ret = access(uuidd_path, X_OK);
|
|
if (access_ret == 0)
|
|
access_ret = stat(uuidd_path, &st);
|
|
if (access_ret == 0 && (st.st_mode & (S_ISUID | S_ISGID)) == 0)
|
|
access_ret = access(UUIDD_DIR, W_OK);
|
|
if (access_ret == 0 && start_attempts++ < 5) {
|
|
if ((pid = fork()) == 0) {
|
|
close_all_fds();
|
|
execl(uuidd_path, "uuidd", "-qT", "300",
|
|
(char *) NULL);
|
|
exit(1);
|
|
}
|
|
(void) waitpid(pid, 0, 0);
|
|
if (connect(s, (const struct sockaddr *) &srv_addr,
|
|
sizeof(struct sockaddr_un)) < 0)
|
|
goto fail;
|
|
} else
|
|
goto fail;
|
|
}
|
|
op_buf[0] = op;
|
|
op_len = 1;
|
|
if (op == UUIDD_OP_BULK_TIME_UUID) {
|
|
memcpy(op_buf+1, num, sizeof(*num));
|
|
op_len += sizeof(*num);
|
|
expected += sizeof(*num);
|
|
}
|
|
|
|
ret = write(s, op_buf, op_len);
|
|
if (ret < 1)
|
|
goto fail;
|
|
|
|
ret = read_all(s, (char *) &reply_len, sizeof(reply_len));
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
if (reply_len != expected)
|
|
goto fail;
|
|
|
|
ret = read_all(s, op_buf, reply_len);
|
|
|
|
if (op == UUIDD_OP_BULK_TIME_UUID)
|
|
memcpy(op_buf+16, num, sizeof(int));
|
|
|
|
memcpy(out, op_buf, 16);
|
|
|
|
close(s);
|
|
return ((ret == expected) ? 0 : -1);
|
|
|
|
fail:
|
|
close(s);
|
|
#endif
|
|
return -1;
|
|
}
|
|
#if __GNUC_PREREQ (4, 6)
|
|
#pragma GCC diagnostic pop
|
|
#endif
|
|
|
|
void uuid__generate_time(uuid_t out, int *num)
|
|
{
|
|
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, num);
|
|
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_time(uuid_t out)
|
|
{
|
|
#ifdef TLS
|
|
THREAD_LOCAL int num = 0;
|
|
THREAD_LOCAL struct uuid uu;
|
|
THREAD_LOCAL time_t last_time = 0;
|
|
time_t now;
|
|
|
|
if (num > 0) {
|
|
now = time(0);
|
|
if (now > last_time+1)
|
|
num = 0;
|
|
}
|
|
if (num <= 0) {
|
|
num = 1000;
|
|
if (get_uuid_via_daemon(UUIDD_OP_BULK_TIME_UUID,
|
|
out, &num) == 0) {
|
|
last_time = time(0);
|
|
uuid_unpack(out, &uu);
|
|
num--;
|
|
return;
|
|
}
|
|
num = 0;
|
|
}
|
|
if (num > 0) {
|
|
uu.time_low++;
|
|
if (uu.time_low == 0) {
|
|
uu.time_mid++;
|
|
if (uu.time_mid == 0)
|
|
uu.time_hi_and_version++;
|
|
}
|
|
num--;
|
|
uuid_pack(&uu, out);
|
|
return;
|
|
}
|
|
#else
|
|
if (get_uuid_via_daemon(UUIDD_OP_TIME_UUID, out, 0) == 0)
|
|
return;
|
|
#endif
|
|
|
|
uuid__generate_time(out, 0);
|
|
}
|
|
|
|
|
|
void uuid__generate_random(uuid_t out, int *num)
|
|
{
|
|
uuid_t buf;
|
|
struct uuid uu;
|
|
int i, n;
|
|
|
|
if (!num || !*num)
|
|
n = 1;
|
|
else
|
|
n = *num;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
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);
|
|
out += sizeof(uuid_t);
|
|
}
|
|
}
|
|
|
|
void uuid_generate_random(uuid_t out)
|
|
{
|
|
int num = 1;
|
|
/* No real reason to use the daemon for random uuid's -- yet */
|
|
|
|
uuid__generate_random(out, &num);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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);
|
|
}
|