LCOV - app.info - nsprpub/pr/src/md/unix/uxrng.c

LCOV - code coverage report
| Current view: | directory - nsprpub/pr/src/md/unix - uxrng.c (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 29 | 0 | 0.0 %
| Date: | 2012-04-07 | Functions: | 4 | 0 | 0.0 %

           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               0 : static PRStatus OpenDevURandom( void )
         138                 : {
         139               0 :     fdDevURandom = open( "/dev/urandom", O_RDONLY );
         140               0 :     return((-1 == fdDevURandom)? PR_FAILURE : PR_SUCCESS );
         141                 : } /* end OpenDevURandom() */
         142                 :
         143               0 : static size_t GetDevURandom( void *buf, size_t size )
         144                 : {
         145                 :     int bytesIn;
         146                 :     int rc;
         147                 :
         148               0 :     rc = PR_CallOnce( &coOpenDevURandom, OpenDevURandom );
         149               0 :     if ( PR_FAILURE == rc ) {
         150               0 :         _PR_MD_MAP_OPEN_ERROR( errno );
         151               0 :         return(0);
         152                 :     }
         153                 :
         154               0 :     bytesIn = read( fdDevURandom, buf, size );
         155               0 :     if ( -1 == bytesIn ) {
         156               0 :         _PR_MD_MAP_READ_ERROR( errno );
         157               0 :         return(0);
         158                 :     }
         159                 :
         160               0 :     return( bytesIn );
         161                 : } /* end GetDevURandom() */
         162                 :
         163                 : static size_t
         164               0 : GetHighResClock(void *buf, size_t maxbytes)
         165                 : {
         166               0 :     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               0 : extern PRSize _PR_MD_GetRandomNoise( void *buf, PRSize size )
         306                 : {
         307                 :     struct timeval tv;
         308               0 :     int n = 0;
         309                 :     int s;
         310                 :
         311               0 :     n += GetHighResClock(buf, size);
         312               0 :     size -= n;
         313                 :
         314               0 :     GETTIMEOFDAY(&tv);
         315                 :
         316               0 :     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               0 :     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               0 :     return n;
         328                 : } /* end _PR_MD_GetRandomNoise() */

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