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277 lines
6.0 KiB
277 lines
6.0 KiB
/*
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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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* This file may be redistributed under the terms of the GNU
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* Library General Public License.
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* %End-Header%
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*/
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#define _DEFAULT_SOURCE
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/*jowenn: #ifdef HAVE_UNISTD_H*/
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#include <unistd.h>
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/*jowenn: #endif*/
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/*jowenn: #ifdef HAVE_STDLIB_H*/
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#include <stdlib.h>
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/*jowenn: #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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#include <sys/time.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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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_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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#include "uuidP.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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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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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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srand((getpid() << 16) ^ getuid() ^ tv.tv_sec ^ tv.tv_usec);
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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 = (unsigned char *) 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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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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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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/*
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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(*ifr) ) {
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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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/*
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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 /* 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(__u32 *clock_high, __u32 *clock_low, __u16 *ret_clock_seq)
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{
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static int adjustment = 0;
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static struct timeval last = {0, 0};
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static __u16 clock_seq;
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struct timeval tv;
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unsigned longlong clock_reg;
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try_again:
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gettimeofday(&tv, 0);
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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 &= 0x1FFF;
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last = tv;
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last.tv_sec--;
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}
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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) & 0x1FFF;
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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 += ((unsigned longlong) tv.tv_sec)*10000000;
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clock_reg += (((unsigned longlong) 0x01B21DD2) << 32) + 0x13814000;
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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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void uuid_generate_time(uuid_t out)
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{
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static unsigned char node_id[6];
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static int has_init = 0;
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struct uuid uu;
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__u32 clock_mid;
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if (!has_init) {
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if (get_node_id(node_id) <= 0) {
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get_random_bytes(node_id, 6);
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/*
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* Set multicast bit, to prevent conflicts
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* with IEEE 802 addresses obtained from
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* network cards
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*/
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node_id[0] |= 0x80;
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}
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has_init = 1;
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}
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get_clock(&clock_mid, &uu.time_low, &uu.clock_seq);
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uu.clock_seq |= 0x8000;
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uu.time_mid = (__u16) clock_mid;
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uu.time_hi_and_version = (clock_mid >> 16) | 0x1000;
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memcpy(uu.node, node_id, 6);
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uuid_pack(&uu, out);
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}
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void uuid_generate_random(uuid_t out)
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{
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uuid_t buf;
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struct uuid uu;
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get_random_bytes(buf, sizeof(buf));
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uuid_unpack(buf, &uu);
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uu.clock_seq = (uu.clock_seq & 0x3FFF) | 0x8000;
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uu.time_hi_and_version = (uu.time_hi_and_version & 0x0FFF) | 0x4000;
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uuid_pack(&uu, out);
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}
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/*
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* This is the generic front-end to uuid_generate_random and
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* uuid_generate_time. It uses uuid_generate_random only if
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* /dev/urandom is available, since otherwise we won't have
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* high-quality randomness.
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*/
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void uuid_generate(uuid_t out)
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{
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if (get_random_fd() >= 0)
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uuid_generate_random(out);
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else
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uuid_generate_time(out);
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}
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