diff options
Diffstat (limited to 'nsprpub/pr/src/md/unix/uxrng.c')
| -rw-r--r-- | nsprpub/pr/src/md/unix/uxrng.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/nsprpub/pr/src/md/unix/uxrng.c b/nsprpub/pr/src/md/unix/uxrng.c new file mode 100644 index 000000000..da2f7e9fe --- /dev/null +++ b/nsprpub/pr/src/md/unix/uxrng.c @@ -0,0 +1,252 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + + +#include "primpl.h" + +#include <string.h> +#include <unistd.h> +#include <errno.h> +#include <sys/time.h> + + +#if defined(SOLARIS) + +static size_t +GetHighResClock(void *buf, size_t maxbytes) +{ + hrtime_t t; + t = gethrtime(); + if (t) { + return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t)); + } + return 0; +} + +#elif defined(HPUX) + +#ifdef __ia64 +#include <ia64/sys/inline.h> + +static size_t +GetHighResClock(void *buf, size_t maxbytes) +{ + PRUint64 t; + +#ifdef __GNUC__ + __asm__ __volatile__("mov %0 = ar.itc" : "=r" (t)); +#else + t = _Asm_mov_from_ar(_AREG44); +#endif + return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t)); +} +#else +static size_t +GetHighResClock(void *buf, size_t maxbytes) +{ + extern int ret_cr16(); + int cr16val; + + cr16val = ret_cr16(); + return(_pr_CopyLowBits(buf, maxbytes, &cr16val, sizeof(cr16val))); +} +#endif + +#elif defined(OSF1) + +#include <c_asm.h> + +/* + * Use the "get the cycle counter" instruction on the alpha. + * The low 32 bits completely turn over in less than a minute. + * The high 32 bits are some non-counter gunk that changes sometimes. + */ +static size_t +GetHighResClock(void *buf, size_t maxbytes) +{ + unsigned long t; + +#ifdef __GNUC__ + __asm__("rpcc %0" : "=r" (t)); +#else + t = asm("rpcc %v0"); +#endif + return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t)); +} + +#elif defined(AIX) + +static size_t +GetHighResClock(void *buf, size_t maxbytes) +{ + return 0; +} + +#elif (defined(LINUX) || defined(FREEBSD) || defined(__FreeBSD_kernel__) \ + || defined(NETBSD) || defined(__NetBSD_kernel__) || defined(OPENBSD) \ + || defined(SYMBIAN) || defined(__GNU__)) +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> + +static int fdDevURandom; +static PRCallOnceType coOpenDevURandom; + +static PRStatus OpenDevURandom( void ) +{ + fdDevURandom = open( "/dev/urandom", O_RDONLY ); + return((-1 == fdDevURandom)? PR_FAILURE : PR_SUCCESS ); +} /* end OpenDevURandom() */ + +static size_t GetDevURandom( void *buf, size_t size ) +{ + int bytesIn; + int rc; + + rc = PR_CallOnce( &coOpenDevURandom, OpenDevURandom ); + if ( PR_FAILURE == rc ) { + _PR_MD_MAP_OPEN_ERROR( errno ); + return(0); + } + + bytesIn = read( fdDevURandom, buf, size ); + if ( -1 == bytesIn ) { + _PR_MD_MAP_READ_ERROR( errno ); + return(0); + } + + return( bytesIn ); +} /* end GetDevURandom() */ + +static size_t +GetHighResClock(void *buf, size_t maxbytes) +{ + return(GetDevURandom( buf, maxbytes )); +} + +#elif defined(IRIX) +#include <fcntl.h> +#undef PRIVATE +#include <sys/mman.h> +#include <sys/syssgi.h> +#include <sys/immu.h> +#include <sys/systeminfo.h> +#include <sys/utsname.h> + +static size_t GetHighResClock(void *buf, size_t maxbuf) +{ + unsigned phys_addr, raddr, cycleval; + static volatile unsigned *iotimer_addr = NULL; + static int tries = 0; + static int cntr_size; + int mfd; + unsigned s0[2]; + +#ifndef SGI_CYCLECNTR_SIZE +#define SGI_CYCLECNTR_SIZE 165 /* Size user needs to use to read CC */ +#endif + + if (iotimer_addr == NULL) { + if (tries++ > 1) { + /* Don't keep trying if it didn't work */ + return 0; + } + + /* + ** For SGI machines we can use the cycle counter, if it has one, + ** to generate some truly random numbers + */ + phys_addr = syssgi(SGI_QUERY_CYCLECNTR, &cycleval); + if (phys_addr) { + int pgsz = getpagesize(); + int pgoffmask = pgsz - 1; + + raddr = phys_addr & ~pgoffmask; + mfd = open("/dev/mmem", O_RDONLY); + if (mfd < 0) { + return 0; + } + iotimer_addr = (unsigned *) + mmap(0, pgoffmask, PROT_READ, MAP_PRIVATE, mfd, (int)raddr); + if (iotimer_addr == (unsigned*)-1) { + close(mfd); + iotimer_addr = NULL; + return 0; + } + iotimer_addr = (unsigned*) + ((__psint_t)iotimer_addr | (phys_addr & pgoffmask)); + /* + * The file 'mfd' is purposefully not closed. + */ + cntr_size = syssgi(SGI_CYCLECNTR_SIZE); + if (cntr_size < 0) { + struct utsname utsinfo; + + /* + * We must be executing on a 6.0 or earlier system, since the + * SGI_CYCLECNTR_SIZE call is not supported. + * + * The only pre-6.1 platforms with 64-bit counters are + * IP19 and IP21 (Challenge, PowerChallenge, Onyx). + */ + uname(&utsinfo); + if (!strncmp(utsinfo.machine, "IP19", 4) || + !strncmp(utsinfo.machine, "IP21", 4)) + cntr_size = 64; + else + cntr_size = 32; + } + cntr_size /= 8; /* Convert from bits to bytes */ + } + } + + s0[0] = *iotimer_addr; + if (cntr_size > 4) + s0[1] = *(iotimer_addr + 1); + memcpy(buf, (char *)&s0[0], cntr_size); + return _pr_CopyLowBits(buf, maxbuf, &s0, cntr_size); +} + +#elif defined(SCO) || defined(UNIXWARE) || defined(BSDI) || defined(NTO) \ + || defined(QNX) || defined(DARWIN) || defined(RISCOS) +#include <sys/times.h> + +static size_t +GetHighResClock(void *buf, size_t maxbytes) +{ + int ticks; + struct tms buffer; + + ticks=times(&buffer); + return _pr_CopyLowBits(buf, maxbytes, &ticks, sizeof(ticks)); +} +#else +#error! Platform undefined +#endif /* defined(SOLARIS) */ + +extern PRSize _PR_MD_GetRandomNoise( void *buf, PRSize size ) +{ + struct timeval tv; + int n = 0; + int s; + + n += GetHighResClock(buf, size); + size -= n; + + GETTIMEOFDAY(&tv); + + if ( size > 0 ) { + s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_usec, sizeof(tv.tv_usec)); + size -= s; + n += s; + } + if ( size > 0 ) { + s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_sec, sizeof(tv.tv_usec)); + size -= s; + n += s; + } + + return n; +} /* end _PR_MD_GetRandomNoise() */ |