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mem_dbg.c

/* crypto/mem_dbg.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <stdlib.h>
#include <time.h> 
#include "cryptlib.h"
#include <openssl/crypto.h>
#include <openssl/buffer.h>
#include <openssl/bio.h>
#include <openssl/lhash.h>

static int mh_mode=CRYPTO_MEM_CHECK_OFF;
/* The state changes to CRYPTO_MEM_CHECK_ON | CRYPTO_MEM_CHECK_ENABLE
 * when the application asks for it (usually after library initialisation
 * for which no book-keeping is desired).
 *
 * State CRYPTO_MEM_CHECK_ON exists only temporarily when the library
 * thinks that certain allocations should not be checked (e.g. the data
 * structures used for memory checking).  It is not suitable as an initial
 * state: the library will unexpectedly enable memory checking when it
 * executes one of those sections that want to disable checking
 * temporarily.
 *
 * State CRYPTO_MEM_CHECK_ENABLE without ..._ON makes no sense whatsoever.
 */

static unsigned long order = 0; /* number of memory requests */
static LHASH *mh=NULL; /* hash-table of memory requests (address as key);
                        * access requires MALLOC2 lock */


typedef struct app_mem_info_st
/* For application-defined information (static C-string `info')
 * to be displayed in memory leak list.
 * Each thread has its own stack.  For applications, there is
 *   CRYPTO_push_info("...")     to push an entry,
 *   CRYPTO_pop_info()           to pop an entry,
 *   CRYPTO_remove_all_info()    to pop all entries.
 */
      {     
      unsigned long thread;
      const char *file;
      int line;
      const char *info;
      struct app_mem_info_st *next; /* tail of thread's stack */
      int references;
      } APP_INFO;

static void app_info_free(APP_INFO *);

static LHASH *amih=NULL; /* hash-table with those app_mem_info_st's
                          * that are at the top of their thread's stack
                          * (with `thread' as key);
                          * access requires MALLOC2 lock */

typedef struct mem_st
/* memory-block description */
      {
      void *addr;
      int num;
      const char *file;
      int line;
      unsigned long thread;
      unsigned long order;
      time_t time;
      APP_INFO *app_info;
      } MEM;

static long options =             /* extra information to be recorded */
#if defined(CRYPTO_MDEBUG_TIME) || defined(CRYPTO_MDEBUG_ALL)
      V_CRYPTO_MDEBUG_TIME |
#endif
#if defined(CRYPTO_MDEBUG_THREAD) || defined(CRYPTO_MDEBUG_ALL)
      V_CRYPTO_MDEBUG_THREAD |
#endif
      0;


static unsigned int num_disable = 0; /* num_disable > 0
                                      *     iff
                                      * mh_mode == CRYPTO_MEM_CHECK_ON (w/o ..._ENABLE)
                                      */
static unsigned long disabling_thread = 0; /* Valid iff num_disable > 0.
                                            * CRYPTO_LOCK_MALLOC2 is locked
                                            * exactly in this case (by the
                                            * thread named in disabling_thread).
                                            */

static void app_info_free(APP_INFO *inf)
      {
      if (--(inf->references) <= 0)
            {
            if (inf->next != NULL)
                  {
                  app_info_free(inf->next);
                  }
            OPENSSL_free(inf);
            }
      }

int CRYPTO_mem_ctrl(int mode)
      {
      int ret=mh_mode;

      CRYPTO_w_lock(CRYPTO_LOCK_MALLOC);
      switch (mode)
            {
      /* for applications (not to be called while multiple threads
       * use the library): */
      case CRYPTO_MEM_CHECK_ON: /* aka MemCheck_start() */
            mh_mode = CRYPTO_MEM_CHECK_ON|CRYPTO_MEM_CHECK_ENABLE;
            num_disable = 0;
            break;
      case CRYPTO_MEM_CHECK_OFF: /* aka MemCheck_stop() */
            mh_mode = 0;
            num_disable = 0; /* should be true *before* MemCheck_stop is used,
                                or there'll be a lot of confusion */
            break;

      /* switch off temporarily (for library-internal use): */
      case CRYPTO_MEM_CHECK_DISABLE: /* aka MemCheck_off() */
            if (mh_mode & CRYPTO_MEM_CHECK_ON)
                  {
                  if (!num_disable || (disabling_thread != CRYPTO_thread_id())) /* otherwise we already have the MALLOC2 lock */
                        {
                        /* Long-time lock CRYPTO_LOCK_MALLOC2 must not be claimed while
                         * we're holding CRYPTO_LOCK_MALLOC, or we'll deadlock if
                         * somebody else holds CRYPTO_LOCK_MALLOC2 (and cannot release
                         * it because we block entry to this function).
                         * Give them a chance, first, and then claim the locks in
                         * appropriate order (long-time lock first).
                         */
                        CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC);
                        /* Note that after we have waited for CRYPTO_LOCK_MALLOC2
                         * and CRYPTO_LOCK_MALLOC, we'll still be in the right
                         * "case" and "if" branch because MemCheck_start and
                         * MemCheck_stop may never be used while there are multiple
                         * OpenSSL threads. */
                        CRYPTO_w_lock(CRYPTO_LOCK_MALLOC2);
                        CRYPTO_w_lock(CRYPTO_LOCK_MALLOC);
                        mh_mode &= ~CRYPTO_MEM_CHECK_ENABLE;
                        disabling_thread=CRYPTO_thread_id();
                        }
                  num_disable++;
                  }
            break;
      case CRYPTO_MEM_CHECK_ENABLE: /* aka MemCheck_on() */
            if (mh_mode & CRYPTO_MEM_CHECK_ON)
                  {
                  if (num_disable) /* always true, or something is going wrong */
                        {
                        num_disable--;
                        if (num_disable == 0)
                              {
                              mh_mode|=CRYPTO_MEM_CHECK_ENABLE;
                              CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC2);
                              }
                        }
                  }
            break;

      default:
            break;
            }
      CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC);
      return(ret);
      }

int CRYPTO_is_mem_check_on(void)
      {
      int ret = 0;

      if (mh_mode & CRYPTO_MEM_CHECK_ON)
            {
            CRYPTO_r_lock(CRYPTO_LOCK_MALLOC);

            ret = (mh_mode & CRYPTO_MEM_CHECK_ENABLE)
                  || (disabling_thread != CRYPTO_thread_id());

            CRYPTO_r_unlock(CRYPTO_LOCK_MALLOC);
            }
      return(ret);
      }     


void CRYPTO_dbg_set_options(long bits)
      {
      options = bits;
      }

long CRYPTO_dbg_get_options(void)
      {
      return options;
      }

/* static int mem_cmp(MEM *a, MEM *b) */
static int mem_cmp(const void *a_void, const void *b_void)
      {
#ifdef _WIN64
      const char *a=(const char *)((const MEM *)a_void)->addr,
               *b=(const char *)((const MEM *)b_void)->addr;
      if (a==b)   return 0;
      else if (a>b)     return 1;
      else        return -1;
#else
      return((const char *)((const MEM *)a_void)->addr
            - (const char *)((const MEM *)b_void)->addr);
#endif
      }

/* static unsigned long mem_hash(MEM *a) */
static unsigned long mem_hash(const void *a_void)
      {
      unsigned long ret;

      ret=(unsigned long)((const MEM *)a_void)->addr;

      ret=ret*17851+(ret>>14)*7+(ret>>4)*251;
      return(ret);
      }

/* static int app_info_cmp(APP_INFO *a, APP_INFO *b) */
static int app_info_cmp(const void *a_void, const void *b_void)
      {
      return(((const APP_INFO *)a_void)->thread
            != ((const APP_INFO *)b_void)->thread);
      }

/* static unsigned long app_info_hash(APP_INFO *a) */
static unsigned long app_info_hash(const void *a_void)
      {
      unsigned long ret;

      ret=(unsigned long)((const APP_INFO *)a_void)->thread;

      ret=ret*17851+(ret>>14)*7+(ret>>4)*251;
      return(ret);
      }

static APP_INFO *pop_info(void)
      {
      APP_INFO tmp;
      APP_INFO *ret = NULL;

      if (amih != NULL)
            {
            tmp.thread=CRYPTO_thread_id();
            if ((ret=(APP_INFO *)lh_delete(amih,&tmp)) != NULL)
                  {
                  APP_INFO *next=ret->next;

                  if (next != NULL)
                        {
                        next->references++;
                        lh_insert(amih,(char *)next);
                        }
#ifdef LEVITTE_DEBUG_MEM
                  if (ret->thread != tmp.thread)
                        {
                        fprintf(stderr, "pop_info(): deleted info has other thread ID (%lu) than the current thread (%lu)!!!!\n",
                              ret->thread, tmp.thread);
                        abort();
                        }
#endif
                  if (--(ret->references) <= 0)
                        {
                        ret->next = NULL;
                        if (next != NULL)
                              next->references--;
                        OPENSSL_free(ret);
                        }
                  }
            }
      return(ret);
      }

int CRYPTO_dbg_push_info(const char *info, const char *file, int line)
      {
      APP_INFO *ami, *amim;
      int ret=0;

      if (is_MemCheck_on())
            {
            MemCheck_off(); /* obtain MALLOC2 lock */

            if ((ami = (APP_INFO *)OPENSSL_malloc(sizeof(APP_INFO))) == NULL)
                  {
                  ret=0;
                  goto err;
                  }
            if (amih == NULL)
                  {
                  if ((amih=lh_new(app_info_hash, app_info_cmp)) == NULL)
                        {
                        OPENSSL_free(ami);
                        ret=0;
                        goto err;
                        }
                  }

            ami->thread=CRYPTO_thread_id();
            ami->file=file;
            ami->line=line;
            ami->info=info;
            ami->references=1;
            ami->next=NULL;

            if ((amim=(APP_INFO *)lh_insert(amih,(char *)ami)) != NULL)
                  {
#ifdef LEVITTE_DEBUG_MEM
                  if (ami->thread != amim->thread)
                        {
                        fprintf(stderr, "CRYPTO_push_info(): previous info has other thread ID (%lu) than the current thread (%lu)!!!!\n",
                              amim->thread, ami->thread);
                        abort();
                        }
#endif
                  ami->next=amim;
                  }
 err:
            MemCheck_on(); /* release MALLOC2 lock */
            }

      return(ret);
      }

int CRYPTO_dbg_pop_info(void)
      {
      int ret=0;

      if (is_MemCheck_on()) /* _must_ be true, or something went severely wrong */
            {
            MemCheck_off(); /* obtain MALLOC2 lock */

            ret=(pop_info() != NULL);

            MemCheck_on(); /* release MALLOC2 lock */
            }
      return(ret);
      }

int CRYPTO_dbg_remove_all_info(void)
      {
      int ret=0;

      if (is_MemCheck_on()) /* _must_ be true */
            {
            MemCheck_off(); /* obtain MALLOC2 lock */

            while(pop_info() != NULL)
                  ret++;

            MemCheck_on(); /* release MALLOC2 lock */
            }
      return(ret);
      }


static unsigned long break_order_num=0;
void CRYPTO_dbg_malloc(void *addr, int num, const char *file, int line,
      int before_p)
      {
      MEM *m,*mm;
      APP_INFO tmp,*amim;

      switch(before_p & 127)
            {
      case 0:
            break;
      case 1:
            if (addr == NULL)
                  break;

            if (is_MemCheck_on())
                  {
                  MemCheck_off(); /* make sure we hold MALLOC2 lock */
                  if ((m=(MEM *)OPENSSL_malloc(sizeof(MEM))) == NULL)
                        {
                        OPENSSL_free(addr);
                        MemCheck_on(); /* release MALLOC2 lock
                                        * if num_disabled drops to 0 */
                        return;
                        }
                  if (mh == NULL)
                        {
                        if ((mh=lh_new(mem_hash, mem_cmp)) == NULL)
                              {
                              OPENSSL_free(addr);
                              OPENSSL_free(m);
                              addr=NULL;
                              goto err;
                              }
                        }

                  m->addr=addr;
                  m->file=file;
                  m->line=line;
                  m->num=num;
                  if (options & V_CRYPTO_MDEBUG_THREAD)
                        m->thread=CRYPTO_thread_id();
                  else
                        m->thread=0;

                  if (order == break_order_num)
                        {
                        /* BREAK HERE */
                        m->order=order;
                        }
                  m->order=order++;
#ifdef LEVITTE_DEBUG_MEM
                  fprintf(stderr, "LEVITTE_DEBUG_MEM: [%5d] %c 0x%p (%d)\n",
                        m->order,
                        (before_p & 128) ? '*' : '+',
                        m->addr, m->num);
#endif
                  if (options & V_CRYPTO_MDEBUG_TIME)
                        m->time=time(NULL);
                  else
                        m->time=0;

                  tmp.thread=CRYPTO_thread_id();
                  m->app_info=NULL;
                  if (amih != NULL
                        && (amim=(APP_INFO *)lh_retrieve(amih,(char *)&tmp)) != NULL)
                        {
                        m->app_info = amim;
                        amim->references++;
                        }

                  if ((mm=(MEM *)lh_insert(mh,(char *)m)) != NULL)
                        {
                        /* Not good, but don't sweat it */
                        if (mm->app_info != NULL)
                              {
                              mm->app_info->references--;
                              }
                        OPENSSL_free(mm);
                        }
            err:
                  MemCheck_on(); /* release MALLOC2 lock
                                  * if num_disabled drops to 0 */
                  }
            break;
            }
      return;
      }

void CRYPTO_dbg_free(void *addr, int before_p)
      {
      MEM m,*mp;

      switch(before_p)
            {
      case 0:
            if (addr == NULL)
                  break;

            if (is_MemCheck_on() && (mh != NULL))
                  {
                  MemCheck_off(); /* make sure we hold MALLOC2 lock */

                  m.addr=addr;
                  mp=(MEM *)lh_delete(mh,(char *)&m);
                  if (mp != NULL)
                        {
#ifdef LEVITTE_DEBUG_MEM
                  fprintf(stderr, "LEVITTE_DEBUG_MEM: [%5d] - 0x%p (%d)\n",
                        mp->order, mp->addr, mp->num);
#endif
                        if (mp->app_info != NULL)
                              app_info_free(mp->app_info);
                        OPENSSL_free(mp);
                        }

                  MemCheck_on(); /* release MALLOC2 lock
                                  * if num_disabled drops to 0 */
                  }
            break;
      case 1:
            break;
            }
      }

void CRYPTO_dbg_realloc(void *addr1, void *addr2, int num,
      const char *file, int line, int before_p)
      {
      MEM m,*mp;

#ifdef LEVITTE_DEBUG_MEM
      fprintf(stderr, "LEVITTE_DEBUG_MEM: --> CRYPTO_dbg_malloc(addr1 = %p, addr2 = %p, num = %d, file = \"%s\", line = %d, before_p = %d)\n",
            addr1, addr2, num, file, line, before_p);
#endif

      switch(before_p)
            {
      case 0:
            break;
      case 1:
            if (addr2 == NULL)
                  break;

            if (addr1 == NULL)
                  {
                  CRYPTO_dbg_malloc(addr2, num, file, line, 128 | before_p);
                  break;
                  }

            if (is_MemCheck_on())
                  {
                  MemCheck_off(); /* make sure we hold MALLOC2 lock */

                  m.addr=addr1;
                  mp=(MEM *)lh_delete(mh,(char *)&m);
                  if (mp != NULL)
                        {
#ifdef LEVITTE_DEBUG_MEM
                        fprintf(stderr, "LEVITTE_DEBUG_MEM: [%5d] * 0x%p (%d) -> 0x%p (%d)\n",
                              mp->order,
                              mp->addr, mp->num,
                              addr2, num);
#endif
                        mp->addr=addr2;
                        mp->num=num;
                        lh_insert(mh,(char *)mp);
                        }

                  MemCheck_on(); /* release MALLOC2 lock
                                  * if num_disabled drops to 0 */
                  }
            break;
            }
      return;
      }


typedef struct mem_leak_st
      {
      BIO *bio;
      int chunks;
      long bytes;
      } MEM_LEAK;

static void print_leak(const MEM *m, MEM_LEAK *l)
      {
      char buf[1024];
      char *bufp = buf;
      APP_INFO *amip;
      int ami_cnt;
      struct tm *lcl = NULL;
      unsigned long ti;

#define BUF_REMAIN (sizeof buf - (size_t)(bufp - buf))

      if(m->addr == (char *)l->bio)
          return;

      if (options & V_CRYPTO_MDEBUG_TIME)
            {
            lcl = localtime(&m->time);
      
            BIO_snprintf(bufp, BUF_REMAIN, "[%02d:%02d:%02d] ",
                  lcl->tm_hour,lcl->tm_min,lcl->tm_sec);
            bufp += strlen(bufp);
            }

      BIO_snprintf(bufp, BUF_REMAIN, "%5lu file=%s, line=%d, ",
            m->order,m->file,m->line);
      bufp += strlen(bufp);

      if (options & V_CRYPTO_MDEBUG_THREAD)
            {
            BIO_snprintf(bufp, BUF_REMAIN, "thread=%lu, ", m->thread);
            bufp += strlen(bufp);
            }

      BIO_snprintf(bufp, BUF_REMAIN, "number=%d, address=%08lX\n",
            m->num,(unsigned long)m->addr);
      bufp += strlen(bufp);

      BIO_puts(l->bio,buf);
      
      l->chunks++;
      l->bytes+=m->num;

      amip=m->app_info;
      ami_cnt=0;
      if (!amip)
            return;
      ti=amip->thread;
      
      do
            {
            int buf_len;
            int info_len;

            ami_cnt++;
            memset(buf,'>',ami_cnt);
            BIO_snprintf(buf + ami_cnt, sizeof buf - ami_cnt,
                  " thread=%lu, file=%s, line=%d, info=\"",
                  amip->thread, amip->file, amip->line);
            buf_len=strlen(buf);
            info_len=strlen(amip->info);
            if (128 - buf_len - 3 < info_len)
                  {
                  memcpy(buf + buf_len, amip->info, 128 - buf_len - 3);
                  buf_len = 128 - 3;
                  }
            else
                  {
                  BUF_strlcpy(buf + buf_len, amip->info,
                            sizeof buf - buf_len);
                  buf_len = strlen(buf);
                  }
            BIO_snprintf(buf + buf_len, sizeof buf - buf_len, "\"\n");
            
            BIO_puts(l->bio,buf);

            amip = amip->next;
            }
      while(amip && amip->thread == ti);
            
#ifdef LEVITTE_DEBUG_MEM
      if (amip)
            {
            fprintf(stderr, "Thread switch detected in backtrace!!!!\n");
            abort();
            }
#endif
      }

static IMPLEMENT_LHASH_DOALL_ARG_FN(print_leak, const MEM *, MEM_LEAK *)

void CRYPTO_mem_leaks(BIO *b)
      {
      MEM_LEAK ml;

      if (mh == NULL && amih == NULL)
            return;

      MemCheck_off(); /* obtain MALLOC2 lock */

      ml.bio=b;
      ml.bytes=0;
      ml.chunks=0;
      if (mh != NULL)
            lh_doall_arg(mh, LHASH_DOALL_ARG_FN(print_leak),
                        (char *)&ml);
      if (ml.chunks != 0)
            {
            BIO_printf(b,"%ld bytes leaked in %d chunks\n",
                     ml.bytes,ml.chunks);
            }
      else
            {
            /* Make sure that, if we found no leaks, memory-leak debugging itself
             * does not introduce memory leaks (which might irritate
             * external debugging tools).
             * (When someone enables leak checking, but does not call
             * this function, we declare it to be their fault.)
             *
             * XXX    This should be in CRYPTO_mem_leaks_cb,
             * and CRYPTO_mem_leaks should be implemented by
             * using CRYPTO_mem_leaks_cb.
             * (Also their should be a variant of lh_doall_arg
             * that takes a function pointer instead of a void *;
             * this would obviate the ugly and illegal
             * void_fn_to_char kludge in CRYPTO_mem_leaks_cb.
             * Otherwise the code police will come and get us.)
             */
            int old_mh_mode;

            CRYPTO_w_lock(CRYPTO_LOCK_MALLOC);

            /* avoid deadlock when lh_free() uses CRYPTO_dbg_free(),
             * which uses CRYPTO_is_mem_check_on */
            old_mh_mode = mh_mode;
            mh_mode = CRYPTO_MEM_CHECK_OFF;

            if (mh != NULL)
                  {
                  lh_free(mh);
                  mh = NULL;
                  }
            if (amih != NULL)
                  {
                  if (lh_num_items(amih) == 0) 
                        {
                        lh_free(amih);
                        amih = NULL;
                        }
                  }

            mh_mode = old_mh_mode;
            CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC);
            }
      MemCheck_on(); /* release MALLOC2 lock */
      }

#ifndef OPENSSL_NO_FP_API
void CRYPTO_mem_leaks_fp(FILE *fp)
      {
      BIO *b;

      if (mh == NULL) return;
      /* Need to turn off memory checking when allocated BIOs ... especially
       * as we're creating them at a time when we're trying to check we've not
       * left anything un-free()'d!! */
      MemCheck_off();
      b = BIO_new(BIO_s_file());
      MemCheck_on();
      if(!b) return;
      BIO_set_fp(b,fp,BIO_NOCLOSE);
      CRYPTO_mem_leaks(b);
      BIO_free(b);
      }
#endif



/* FIXME: We really don't allow much to the callback.  For example, it has
   no chance of reaching the info stack for the item it processes.  Should
   it really be this way?  -- Richard Levitte */
/* NB: The prototypes have been typedef'd to CRYPTO_MEM_LEAK_CB inside crypto.h
 * If this code is restructured, remove the callback type if it is no longer
 * needed. -- Geoff Thorpe */
static void cb_leak(const MEM *m, CRYPTO_MEM_LEAK_CB **cb)
      {
      (**cb)(m->order,m->file,m->line,m->num,m->addr);
      }

static IMPLEMENT_LHASH_DOALL_ARG_FN(cb_leak, const MEM *, CRYPTO_MEM_LEAK_CB **)

void CRYPTO_mem_leaks_cb(CRYPTO_MEM_LEAK_CB *cb)
      {
      if (mh == NULL) return;
      CRYPTO_w_lock(CRYPTO_LOCK_MALLOC2);
      lh_doall_arg(mh, LHASH_DOALL_ARG_FN(cb_leak), &cb);
      CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC2);
      }

void CRYPTO_malloc_debug_init(void)
      {
      CRYPTO_set_mem_debug_functions(
            CRYPTO_dbg_malloc,
            CRYPTO_dbg_realloc,
            CRYPTO_dbg_free,
            CRYPTO_dbg_set_options,
            CRYPTO_dbg_get_options);
      CRYPTO_set_mem_info_functions(
            CRYPTO_dbg_push_info,
            CRYPTO_dbg_pop_info,
            CRYPTO_dbg_remove_all_info);
      }

char *CRYPTO_strdup(const char *str, const char *file, int line)
      {
      char *ret = CRYPTO_malloc(strlen(str)+1, file, line);

      strcpy(ret, str);
      return ret;
      }

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