crypto/thr_id.c

   1 /* crypto/cryptlib.c */
   2 /* ====================================================================
   3  * Copyright (c) 1998-2006 The OpenSSL Project.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the
  15  *    distribution.
  16  *
  17  * 3. All advertising materials mentioning features or use of this
  18  *    software must display the following acknowledgment:
  19  *    "This product includes software developed by the OpenSSL Project
  20  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  21  *
  22  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  23  *    endorse or promote products derived from this software without
  24  *    prior written permission. For written permission, please contact
  25  *    openssl-core@openssl.org.
  26  *
  27  * 5. Products derived from this software may not be called "OpenSSL"
  28  *    nor may "OpenSSL" appear in their names without prior written
  29  *    permission of the OpenSSL Project.
  30  *
  31  * 6. Redistributions of any form whatsoever must retain the following
  32  *    acknowledgment:
  33  *    "This product includes software developed by the OpenSSL Project
  34  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  35  *
  36  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  37  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  39  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  42  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  43  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  45  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  46  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  47  * OF THE POSSIBILITY OF SUCH DAMAGE.
  48  * ====================================================================
  49  *
  50  * This product includes cryptographic software written by Eric Young
  51  * (eay@cryptsoft.com).  This product includes software written by Tim
  52  * Hudson (tjh@cryptsoft.com).
  53  *
  54  */
  55 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  56  * All rights reserved.
  57  *
  58  * This package is an SSL implementation written
  59  * by Eric Young (eay@cryptsoft.com).
  60  * The implementation was written so as to conform with Netscapes SSL.
  61  *
  62  * This library is free for commercial and non-commercial use as long as
  63  * the following conditions are aheared to.  The following conditions
  64  * apply to all code found in this distribution, be it the RC4, RSA,
  65  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  66  * included with this distribution is covered by the same copyright terms
  67  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  68  *
  69  * Copyright remains Eric Young's, and as such any Copyright notices in
  70  * the code are not to be removed.
  71  * If this package is used in a product, Eric Young should be given attribution
  72  * as the author of the parts of the library used.
  73  * This can be in the form of a textual message at program startup or
  74  * in documentation (online or textual) provided with the package.
  75  *
  76  * Redistribution and use in source and binary forms, with or without
  77  * modification, are permitted provided that the following conditions
  78  * are met:
  79  * 1. Redistributions of source code must retain the copyright
  80  *    notice, this list of conditions and the following disclaimer.
  81  * 2. Redistributions in binary form must reproduce the above copyright
  82  *    notice, this list of conditions and the following disclaimer in the
  83  *    documentation and/or other materials provided with the distribution.
  84  * 3. All advertising materials mentioning features or use of this software
  85  *    must display the following acknowledgement:
  86  *    "This product includes cryptographic software written by
  87  *     Eric Young (eay@cryptsoft.com)"
  88  *    The word 'cryptographic' can be left out if the rouines from the library
  89  *    being used are not cryptographic related :-).
  90  * 4. If you include any Windows specific code (or a derivative thereof) from
  91  *    the apps directory (application code) you must include an acknowledgement:
  92  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  93  *
  94  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  95  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  96  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  97  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  98  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  99  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 100  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 101  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 102  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 103  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 104  * SUCH DAMAGE.
 105  *
 106  * The licence and distribution terms for any publically available version or
 107  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 108  * copied and put under another distribution licence
 109  * [including the GNU Public Licence.]
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  * ECDH support in OpenSSL originally developed by
 114  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
 115  */
 116
 117 #include "cryptlib.h"
 118
 119 #ifndef OPENSSL_NO_DEPRECATED
 120 static unsigned long (*id_callback) (void) = 0;
 121 #endif
 122 static void (*threadid_callback) (CRYPTO_THREADID *) = 0;
 123
 124 /*
 125  * the memset() here and in set_pointer() seem overkill, but for the sake of
 126  * CRYPTO_THREADID_cmp() this avoids any platform silliness that might cause
 127  * two "equal" THREADID structs to not be memcmp()-identical.
 128  */
 129 void CRYPTO_THREADID_set_numeric(CRYPTO_THREADID *id, unsigned long val)
 130 {
 131     memset(id, 0, sizeof(*id));
 132     id->val = val;
 133 }
 134
 135 static const unsigned char hash_coeffs[] = { 3, 5, 7, 11, 13, 17, 19, 23 };
 136
 137 void CRYPTO_THREADID_set_pointer(CRYPTO_THREADID *id, void *ptr)
 138 {
 139     unsigned char *dest = (void *)&id->val;
 140     unsigned int accum = 0;
 141     unsigned char dnum = sizeof(id->val);
 142
 143     memset(id, 0, sizeof(*id));
 144     id->ptr = ptr;
 145     if (sizeof(id->val) >= sizeof(id->ptr)) {
 146         /*
 147          * 'ptr' can be embedded in 'val' without loss of uniqueness
 148          */
 149         id->val = (unsigned long)id->ptr;
 150         return;
 151     }
 152     /*
 153      * hash ptr ==> val. Each byte of 'val' gets the mod-256 total of a
 154      * linear function over the bytes in 'ptr', the co-efficients of which
 155      * are a sequence of low-primes (hash_coeffs is an 8-element cycle) - the
 156      * starting prime for the sequence varies for each byte of 'val' (unique
 157      * polynomials unless pointers are >64-bit). For added spice, the totals
 158      * accumulate rather than restarting from zero, and the index of the
 159      * 'val' byte is added each time (position dependence). If I was a
 160      * black-belt, I'd scan big-endian pointers in reverse to give low-order
 161      * bits more play, but this isn't crypto and I'd prefer nobody mistake it
 162      * as such. Plus I'm lazy.
 163      */
 164     while (dnum--) {
 165         const unsigned char *src = (void *)&id->ptr;
 166         unsigned char snum = sizeof(id->ptr);
 167         while (snum--)
 168             accum += *(src++) * hash_coeffs[(snum + dnum) & 7];
 169         accum += dnum;
 170         *(dest++) = accum & 255;
 171     }
 172 }
 173
 174 int CRYPTO_THREADID_set_callback(void (*func) (CRYPTO_THREADID *))
 175 {
 176     if (threadid_callback)
 177         return 0;
 178     threadid_callback = func;
 179     return 1;
 180 }
 181
 182 void (*CRYPTO_THREADID_get_callback(void)) (CRYPTO_THREADID *) {
 183     return threadid_callback;
 184 }
 185
 186 void CRYPTO_THREADID_current(CRYPTO_THREADID *id)
 187 {
 188     if (threadid_callback) {
 189         threadid_callback(id);
 190         return;
 191     }
 192 #ifndef OPENSSL_NO_DEPRECATED
 193     /* If the deprecated callback was set, fall back to that */
 194     if (id_callback) {
 195         CRYPTO_THREADID_set_numeric(id, id_callback());
 196         return;
 197     }
 198 #endif
 199     /* Else pick a backup */
 200 #if defined(OPENSSL_SYS_WIN32)
 201     CRYPTO_THREADID_set_numeric(id, (unsigned long)GetCurrentThreadId());
 202 #else
 203     /* For everything else, default to using the address of 'errno' */
 204     CRYPTO_THREADID_set_pointer(id, (void *)&errno);
 205 #endif
 206 }
 207
 208 int CRYPTO_THREADID_cmp(const CRYPTO_THREADID *a, const CRYPTO_THREADID *b)
 209 {
 210     return memcmp(a, b, sizeof(*a));
 211 }
 212
 213 void CRYPTO_THREADID_cpy(CRYPTO_THREADID *dest, const CRYPTO_THREADID *src)
 214 {
 215     memcpy(dest, src, sizeof(*src));
 216 }
 217
 218 unsigned long CRYPTO_THREADID_hash(const CRYPTO_THREADID *id)
 219 {
 220     return id->val;
 221 }
 222
 223 #ifndef OPENSSL_NO_DEPRECATED
 224 unsigned long (*CRYPTO_get_id_callback(void)) (void) {
 225     return (id_callback);
 226 }
 227
 228 void CRYPTO_set_id_callback(unsigned long (*func) (void))
 229 {
 230     id_callback = func;
 231 }
 232
 233 unsigned long CRYPTO_thread_id(void)
 234 {
 235     unsigned long ret = 0;
 236
 237     if (id_callback == NULL) {
 238 # if defined(OPENSSL_SYS_WIN32)
 239         ret = (unsigned long)GetCurrentThreadId();
 240 # elif defined(GETPID_IS_MEANINGLESS)
 241         ret = 1L;
 242 # else
 243         ret = (unsigned long)getpid();
 244 # endif
 245     } else
 246         ret = id_callback();
 247     return (ret);
 248 }
 249 #endif