LCOV - code coverage report
Current view: directory - nsprpub/pr/src/md/unix - uxrng.c (source / functions) Found Hit Coverage
Test: app.info Lines: 29 19 65.5 %
Date: 2012-06-02 Functions: 4 4 100.0 %

       1                 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is the Netscape Portable Runtime (NSPR).
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 1999-2000
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : 
      39                 : #include "primpl.h"
      40                 : 
      41                 : #include <string.h>
      42                 : #include <unistd.h>
      43                 : #include <errno.h>
      44                 : #include <sys/time.h>
      45                 : 
      46                 : 
      47                 : #if defined(SOLARIS)
      48                 : 
      49                 : static size_t
      50                 : GetHighResClock(void *buf, size_t maxbytes)
      51                 : {
      52                 :     hrtime_t t;
      53                 :     t = gethrtime();
      54                 :     if (t) {
      55                 :             return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
      56                 :     }
      57                 :     return 0;
      58                 : }
      59                 : 
      60                 : #elif defined(SUNOS4)
      61                 : 
      62                 : static size_t
      63                 : GetHighResClock(void *buf, size_t maxbytes)
      64                 : {
      65                 :     return 0;
      66                 : }
      67                 : 
      68                 : #elif defined(HPUX)
      69                 : 
      70                 : #ifdef __ia64
      71                 : #include <ia64/sys/inline.h>
      72                 : 
      73                 : static size_t
      74                 : GetHighResClock(void *buf, size_t maxbytes)
      75                 : {
      76                 :     PRUint64 t;
      77                 : 
      78                 : #ifdef __GNUC__
      79                 :     __asm__ __volatile__("mov %0 = ar.itc" : "=r" (t));
      80                 : #else
      81                 :     t = _Asm_mov_from_ar(_AREG44);
      82                 : #endif
      83                 :     return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
      84                 : }
      85                 : #else
      86                 : static size_t
      87                 : GetHighResClock(void *buf, size_t maxbytes)
      88                 : {
      89                 :     extern int ret_cr16();
      90                 :     int cr16val;
      91                 : 
      92                 :     cr16val = ret_cr16();
      93                 :     return(_pr_CopyLowBits(buf, maxbytes, &cr16val, sizeof(cr16val)));
      94                 : }
      95                 : #endif
      96                 : 
      97                 : #elif defined(OSF1)
      98                 : 
      99                 : #include <c_asm.h>
     100                 : 
     101                 : /*
     102                 :  * Use the "get the cycle counter" instruction on the alpha.
     103                 :  * The low 32 bits completely turn over in less than a minute.
     104                 :  * The high 32 bits are some non-counter gunk that changes sometimes.
     105                 :  */
     106                 : static size_t
     107                 : GetHighResClock(void *buf, size_t maxbytes)
     108                 : {
     109                 :     unsigned long t;
     110                 : 
     111                 : #ifdef __GNUC__
     112                 :     __asm__("rpcc %0" : "=r" (t));
     113                 : #else
     114                 :     t = asm("rpcc %v0");
     115                 : #endif
     116                 :     return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
     117                 : }
     118                 : 
     119                 : #elif defined(AIX)
     120                 : 
     121                 : static size_t
     122                 : GetHighResClock(void *buf, size_t maxbytes)
     123                 : {
     124                 :     return 0;
     125                 : }
     126                 : 
     127                 : #elif (defined(LINUX) || defined(FREEBSD) || defined(__FreeBSD_kernel__) \
     128                 :     || defined(NETBSD) || defined(__NetBSD_kernel__) || defined(OPENBSD) \
     129                 :     || defined(SYMBIAN))
     130                 : #include <sys/types.h>
     131                 : #include <sys/stat.h>
     132                 : #include <fcntl.h>
     133                 : 
     134                 : static int      fdDevURandom;
     135                 : static PRCallOnceType coOpenDevURandom;
     136                 : 
     137            1404 : static PRStatus OpenDevURandom( void )
     138                 : {
     139            1404 :     fdDevURandom = open( "/dev/urandom", O_RDONLY );
     140            1404 :     return((-1 == fdDevURandom)? PR_FAILURE : PR_SUCCESS );
     141                 : } /* end OpenDevURandom() */
     142                 : 
     143            1404 : static size_t GetDevURandom( void *buf, size_t size )
     144                 : {
     145                 :     int bytesIn;
     146                 :     int rc;
     147                 : 
     148            1404 :     rc = PR_CallOnce( &coOpenDevURandom, OpenDevURandom );
     149            1404 :     if ( PR_FAILURE == rc ) {
     150               0 :         _PR_MD_MAP_OPEN_ERROR( errno );
     151               0 :         return(0);
     152                 :     }
     153                 : 
     154            1404 :     bytesIn = read( fdDevURandom, buf, size );
     155            1404 :     if ( -1 == bytesIn ) {
     156               0 :         _PR_MD_MAP_READ_ERROR( errno );
     157               0 :         return(0);
     158                 :     }
     159                 : 
     160            1404 :     return( bytesIn );
     161                 : } /* end GetDevURandom() */
     162                 : 
     163                 : static size_t
     164            1404 : GetHighResClock(void *buf, size_t maxbytes)
     165                 : {             
     166            1404 :     return(GetDevURandom( buf, maxbytes ));
     167                 : }
     168                 : 
     169                 : #elif defined(NCR)
     170                 : 
     171                 : static size_t
     172                 : GetHighResClock(void *buf, size_t maxbytes)
     173                 : {
     174                 :     return 0;
     175                 : }
     176                 : 
     177                 : #elif defined(IRIX)
     178                 : #include <fcntl.h>
     179                 : #undef PRIVATE
     180                 : #include <sys/mman.h>
     181                 : #include <sys/syssgi.h>
     182                 : #include <sys/immu.h>
     183                 : #include <sys/systeminfo.h>
     184                 : #include <sys/utsname.h>
     185                 : 
     186                 : static size_t GetHighResClock(void *buf, size_t maxbuf)
     187                 : {
     188                 :     unsigned phys_addr, raddr, cycleval;
     189                 :     static volatile unsigned *iotimer_addr = NULL;
     190                 :     static int tries = 0;
     191                 :     static int cntr_size;
     192                 :     int mfd;
     193                 :     unsigned s0[2];
     194                 : 
     195                 : #ifndef SGI_CYCLECNTR_SIZE
     196                 : #define SGI_CYCLECNTR_SIZE      165     /* Size user needs to use to read CC */
     197                 : #endif
     198                 : 
     199                 :     if (iotimer_addr == NULL) {
     200                 :             if (tries++ > 1) {
     201                 :                 /* Don't keep trying if it didn't work */
     202                 :                 return 0;
     203                 :             }
     204                 : 
     205                 :             /*
     206                 :             ** For SGI machines we can use the cycle counter, if it has one,
     207                 :             ** to generate some truly random numbers
     208                 :             */
     209                 :             phys_addr = syssgi(SGI_QUERY_CYCLECNTR, &cycleval);
     210                 :             if (phys_addr) {
     211                 :                 int pgsz = getpagesize();
     212                 :                 int pgoffmask = pgsz - 1;
     213                 : 
     214                 :                 raddr = phys_addr & ~pgoffmask;
     215                 :                 mfd = open("/dev/mmem", O_RDONLY);
     216                 :                 if (mfd < 0) {
     217                 :                     return 0;
     218                 :                 }
     219                 :                 iotimer_addr = (unsigned *)
     220                 :                     mmap(0, pgoffmask, PROT_READ, MAP_PRIVATE, mfd, (int)raddr);
     221                 :                 if (iotimer_addr == (unsigned*)-1) {
     222                 :                     close(mfd);
     223                 :                         iotimer_addr = NULL;
     224                 :                         return 0;
     225                 :                 }
     226                 :                 iotimer_addr = (unsigned*)
     227                 :                     ((__psint_t)iotimer_addr | (phys_addr & pgoffmask));
     228                 :                 /*
     229                 :                  * The file 'mfd' is purposefully not closed.
     230                 :                  */
     231                 :                 cntr_size = syssgi(SGI_CYCLECNTR_SIZE);
     232                 :                 if (cntr_size < 0) {
     233                 :                     struct utsname utsinfo;
     234                 : 
     235                 :                         /* 
     236                 :                          * We must be executing on a 6.0 or earlier system, since the
     237                 :                          * SGI_CYCLECNTR_SIZE call is not supported.
     238                 :                          * 
     239                 :                          * The only pre-6.1 platforms with 64-bit counters are
     240                 :                          * IP19 and IP21 (Challenge, PowerChallenge, Onyx).
     241                 :                          */
     242                 :                         uname(&utsinfo);
     243                 :                         if (!strncmp(utsinfo.machine, "IP19", 4) ||
     244                 :                             !strncmp(utsinfo.machine, "IP21", 4))
     245                 :                                 cntr_size = 64;
     246                 :                         else
     247                 :                                 cntr_size = 32;
     248                 :                 }
     249                 :                 cntr_size /= 8; /* Convert from bits to bytes */
     250                 :             }
     251                 :     }
     252                 : 
     253                 :     s0[0] = *iotimer_addr;
     254                 :     if (cntr_size > 4)
     255                 :         s0[1] = *(iotimer_addr + 1);
     256                 :     memcpy(buf, (char *)&s0[0], cntr_size);
     257                 :     return _pr_CopyLowBits(buf, maxbuf, &s0, cntr_size);
     258                 : }
     259                 : 
     260                 : #elif defined(SONY)
     261                 : 
     262                 : static size_t
     263                 : GetHighResClock(void *buf, size_t maxbytes)
     264                 : {
     265                 :     return 0;
     266                 : }
     267                 : 
     268                 : #elif defined(SNI)
     269                 : #include <sys/times.h>
     270                 : 
     271                 : static size_t
     272                 : GetHighResClock(void *buf, size_t maxbytes)
     273                 : {
     274                 :     int ticks;
     275                 :     struct tms buffer;
     276                 : 
     277                 :     ticks=times(&buffer);
     278                 :     return _pr_CopyLowBits(buf, maxbytes, &ticks, sizeof(ticks));
     279                 : }
     280                 : 
     281                 : #elif defined(NEC)
     282                 : 
     283                 : static size_t
     284                 : GetHighResClock(void *buf, size_t maxbytes)
     285                 : {
     286                 :     return 0;
     287                 : }
     288                 : #elif defined(SCO) || defined(UNIXWARE) || defined(BSDI) || defined(NTO) \
     289                 :     || defined(QNX) || defined(DARWIN) || defined(RISCOS)
     290                 : #include <sys/times.h>
     291                 : 
     292                 : static size_t
     293                 : GetHighResClock(void *buf, size_t maxbytes)
     294                 : {
     295                 :     int ticks;
     296                 :     struct tms buffer;
     297                 : 
     298                 :     ticks=times(&buffer);
     299                 :     return _pr_CopyLowBits(buf, maxbytes, &ticks, sizeof(ticks));
     300                 : }
     301                 : #else
     302                 : #error! Platform undefined
     303                 : #endif /* defined(SOLARIS) */
     304                 : 
     305            1404 : extern PRSize _PR_MD_GetRandomNoise( void *buf, PRSize size )
     306                 : {
     307                 :     struct timeval tv;
     308            1404 :     int n = 0;
     309                 :     int s;
     310                 : 
     311            1404 :     n += GetHighResClock(buf, size);
     312            1404 :     size -= n;
     313                 : 
     314            1404 :     GETTIMEOFDAY(&tv);
     315                 : 
     316            1404 :     if ( size > 0 ) {
     317               0 :         s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_usec, sizeof(tv.tv_usec));
     318               0 :         size -= s;
     319               0 :         n += s;
     320                 :     }
     321            1404 :     if ( size > 0 ) {
     322               0 :         s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_sec, sizeof(tv.tv_usec));
     323               0 :         size -= s;
     324               0 :         n += s;
     325                 :     }
     326                 : 
     327            1404 :     return n;
     328                 : } /* end _PR_MD_GetRandomNoise() */

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