Mercurial > trustbridge > nss-cmake-static

annotate nspr/pr/src/md/unix/uxrng.c @ 3:150b72113545

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Add DBM and legacydb support
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:32:02 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6
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7 #include "primpl.h"
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8
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9 #include <string.h>
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10 #include <unistd.h>
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11 #include <errno.h>
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12 #include <sys/time.h>
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13
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14
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15 #if defined(SOLARIS)
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16
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17 static size_t
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18 GetHighResClock(void *buf, size_t maxbytes)
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19 {
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20 hrtime_t t;
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21 t = gethrtime();
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22 if (t) {
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23 return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
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24 }
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25 return 0;
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26 }
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27
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28 #elif defined(HPUX)
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29
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30 #ifdef __ia64
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31 #include <ia64/sys/inline.h>
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32
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33 static size_t
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34 GetHighResClock(void *buf, size_t maxbytes)
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35 {
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36 PRUint64 t;
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37
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38 #ifdef __GNUC__
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39 __asm__ __volatile__("mov %0 = ar.itc" : "=r" (t));
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40 #else
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41 t = _Asm_mov_from_ar(_AREG44);
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42 #endif
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43 return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
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44 }
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45 #else
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46 static size_t
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47 GetHighResClock(void *buf, size_t maxbytes)
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48 {
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49 extern int ret_cr16();
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50 int cr16val;
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51
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52 cr16val = ret_cr16();
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53 return(_pr_CopyLowBits(buf, maxbytes, &cr16val, sizeof(cr16val)));
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54 }
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55 #endif
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56
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57 #elif defined(OSF1)
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58
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59 #include <c_asm.h>
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60
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61 /*
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62 * Use the "get the cycle counter" instruction on the alpha.
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63 * The low 32 bits completely turn over in less than a minute.
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64 * The high 32 bits are some non-counter gunk that changes sometimes.
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65 */
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66 static size_t
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67 GetHighResClock(void *buf, size_t maxbytes)
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68 {
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69 unsigned long t;
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70
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71 #ifdef __GNUC__
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72 __asm__("rpcc %0" : "=r" (t));
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73 #else
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74 t = asm("rpcc %v0");
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75 #endif
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76 return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
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77 }
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78
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79 #elif defined(AIX)
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80
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81 static size_t
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82 GetHighResClock(void *buf, size_t maxbytes)
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83 {
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84 return 0;
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85 }
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86
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87 #elif (defined(LINUX) || defined(FREEBSD) || defined(__FreeBSD_kernel__) \
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88 || defined(NETBSD) || defined(__NetBSD_kernel__) || defined(OPENBSD) \
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89 || defined(SYMBIAN) || defined(__GNU__))
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90 #include <sys/types.h>
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91 #include <sys/stat.h>
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92 #include <fcntl.h>
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93
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94 static int fdDevURandom;
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95 static PRCallOnceType coOpenDevURandom;
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96
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97 static PRStatus OpenDevURandom( void )
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98 {
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99 fdDevURandom = open( "/dev/urandom", O_RDONLY );
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100 return((-1 == fdDevURandom)? PR_FAILURE : PR_SUCCESS );
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101 } /* end OpenDevURandom() */
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102
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103 static size_t GetDevURandom( void *buf, size_t size )
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104 {
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105 int bytesIn;
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106 int rc;
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107
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108 rc = PR_CallOnce( &coOpenDevURandom, OpenDevURandom );
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109 if ( PR_FAILURE == rc ) {
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110 _PR_MD_MAP_OPEN_ERROR( errno );
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111 return(0);
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112 }
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113
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114 bytesIn = read( fdDevURandom, buf, size );
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115 if ( -1 == bytesIn ) {
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116 _PR_MD_MAP_READ_ERROR( errno );
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117 return(0);
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118 }
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119
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120 return( bytesIn );
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121 } /* end GetDevURandom() */
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122
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123 static size_t
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124 GetHighResClock(void *buf, size_t maxbytes)
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125 {
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126 return(GetDevURandom( buf, maxbytes ));
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127 }
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128
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129 #elif defined(IRIX)
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130 #include <fcntl.h>
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131 #undef PRIVATE
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132 #include <sys/mman.h>
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133 #include <sys/syssgi.h>
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134 #include <sys/immu.h>
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135 #include <sys/systeminfo.h>
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136 #include <sys/utsname.h>
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137
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138 static size_t GetHighResClock(void *buf, size_t maxbuf)
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139 {
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140 unsigned phys_addr, raddr, cycleval;
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141 static volatile unsigned *iotimer_addr = NULL;
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142 static int tries = 0;
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143 static int cntr_size;
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144 int mfd;
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145 unsigned s0[2];
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146
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147 #ifndef SGI_CYCLECNTR_SIZE
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148 #define SGI_CYCLECNTR_SIZE 165 /* Size user needs to use to read CC */
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149 #endif
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150
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151 if (iotimer_addr == NULL) {
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152 if (tries++ > 1) {
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153 /* Don't keep trying if it didn't work */
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154 return 0;
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155 }
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156
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157 /*
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158 ** For SGI machines we can use the cycle counter, if it has one,
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159 ** to generate some truly random numbers
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160 */
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161 phys_addr = syssgi(SGI_QUERY_CYCLECNTR, &cycleval);
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162 if (phys_addr) {
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163 int pgsz = getpagesize();
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164 int pgoffmask = pgsz - 1;
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165
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166 raddr = phys_addr & ~pgoffmask;
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167 mfd = open("/dev/mmem", O_RDONLY);
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168 if (mfd < 0) {
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169 return 0;
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170 }
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171 iotimer_addr = (unsigned *)
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172 mmap(0, pgoffmask, PROT_READ, MAP_PRIVATE, mfd, (int)raddr);
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173 if (iotimer_addr == (unsigned*)-1) {
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174 close(mfd);
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175 iotimer_addr = NULL;
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176 return 0;
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177 }
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178 iotimer_addr = (unsigned*)
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179 ((__psint_t)iotimer_addr | (phys_addr & pgoffmask));
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180 /*
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181 * The file 'mfd' is purposefully not closed.
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182 */
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183 cntr_size = syssgi(SGI_CYCLECNTR_SIZE);
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184 if (cntr_size < 0) {
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185 struct utsname utsinfo;
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186
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187 /*
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188 * We must be executing on a 6.0 or earlier system, since the
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189 * SGI_CYCLECNTR_SIZE call is not supported.
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190 *
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191 * The only pre-6.1 platforms with 64-bit counters are
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192 * IP19 and IP21 (Challenge, PowerChallenge, Onyx).
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193 */
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194 uname(&utsinfo);
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195 if (!strncmp(utsinfo.machine, "IP19", 4) ||
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196 !strncmp(utsinfo.machine, "IP21", 4))
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197 cntr_size = 64;
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198 else
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199 cntr_size = 32;
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200 }
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201 cntr_size /= 8; /* Convert from bits to bytes */
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202 }
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203 }
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204
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205 s0[0] = *iotimer_addr;
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206 if (cntr_size > 4)
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207 s0[1] = *(iotimer_addr + 1);
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208 memcpy(buf, (char *)&s0[0], cntr_size);
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209 return _pr_CopyLowBits(buf, maxbuf, &s0, cntr_size);
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210 }
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211
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212 #elif defined(SCO) || defined(UNIXWARE) || defined(BSDI) || defined(NTO) \
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213 || defined(QNX) || defined(DARWIN) || defined(RISCOS)
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214 #include <sys/times.h>
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215
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216 static size_t
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217 GetHighResClock(void *buf, size_t maxbytes)
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218 {
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219 int ticks;
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220 struct tms buffer;
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221
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222 ticks=times(&buffer);
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223 return _pr_CopyLowBits(buf, maxbytes, &ticks, sizeof(ticks));
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224 }
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225 #else
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226 #error! Platform undefined
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227 #endif /* defined(SOLARIS) */
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228
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229 extern PRSize _PR_MD_GetRandomNoise( void *buf, PRSize size )
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230 {
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231 struct timeval tv;
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232 int n = 0;
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233 int s;
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234
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235 n += GetHighResClock(buf, size);
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236 size -= n;
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237
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238 GETTIMEOFDAY(&tv);
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239
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240 if ( size > 0 ) {
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241 s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_usec, sizeof(tv.tv_usec));
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242 size -= s;
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243 n += s;
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244 }
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245 if ( size > 0 ) {
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246 s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_sec, sizeof(tv.tv_usec));
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247 size -= s;
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248 n += s;
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249 }
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250
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251 return n;
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252 } /* end _PR_MD_GetRandomNoise() */
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