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dso_lib.c

/* dso_lib.c -*- mode:C; c-file-style: "eay" -*- */
/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
 *
 * 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 above 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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include <openssl/crypto.h>
#include "cryptlib.h"
#include <openssl/dso.h>

static DSO_METHOD *default_DSO_meth = NULL;

DSO *DSO_new(void)
      {
      return(DSO_new_method(NULL));
      }

void DSO_set_default_method(DSO_METHOD *meth)
      {
      default_DSO_meth = meth;
      }

DSO_METHOD *DSO_get_default_method(void)
      {
      return(default_DSO_meth);
      }

DSO_METHOD *DSO_get_method(DSO *dso)
      {
      return(dso->meth);
      }

DSO_METHOD *DSO_set_method(DSO *dso, DSO_METHOD *meth)
      {
      DSO_METHOD *mtmp;
      mtmp = dso->meth;
      dso->meth = meth;
      return(mtmp);
      }

DSO *DSO_new_method(DSO_METHOD *meth)
      {
      DSO *ret;

      if(default_DSO_meth == NULL)
            /* We default to DSO_METH_openssl() which in turn defaults
             * to stealing the "best available" method. Will fallback
             * to DSO_METH_null() in the worst case. */
            default_DSO_meth = DSO_METHOD_openssl();
      ret = (DSO *)OPENSSL_malloc(sizeof(DSO));
      if(ret == NULL)
            {
            DSOerr(DSO_F_DSO_NEW_METHOD,ERR_R_MALLOC_FAILURE);
            return(NULL);
            }
      memset(ret, 0, sizeof(DSO));
      ret->meth_data = sk_void_new_null();
      if(ret->meth_data == NULL)
            {
            /* sk_new doesn't generate any errors so we do */
            DSOerr(DSO_F_DSO_NEW_METHOD,ERR_R_MALLOC_FAILURE);
            OPENSSL_free(ret);
            return(NULL);
            }
      if(meth == NULL)
            ret->meth = default_DSO_meth;
      else
            ret->meth = meth;
      ret->references = 1;
      if((ret->meth->init != NULL) && !ret->meth->init(ret))
            {
            OPENSSL_free(ret);
            ret=NULL;
            }
      return(ret);
      }

int DSO_free(DSO *dso)
      {
        int i;
 
      if(dso == NULL)
            {
            DSOerr(DSO_F_DSO_FREE,ERR_R_PASSED_NULL_PARAMETER);
            return(0);
            }
 
      i=CRYPTO_add(&dso->references,-1,CRYPTO_LOCK_DSO);
#ifdef REF_PRINT
      REF_PRINT("DSO",dso);
#endif
      if(i > 0) return(1);
#ifdef REF_CHECK
      if(i < 0)
            {
            fprintf(stderr,"DSO_free, bad reference count\n");
            abort();
            }
#endif

      if((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso))
            {
            DSOerr(DSO_F_DSO_FREE,DSO_R_UNLOAD_FAILED);
            return(0);
            }
 
      if((dso->meth->finish != NULL) && !dso->meth->finish(dso))
            {
            DSOerr(DSO_F_DSO_FREE,DSO_R_FINISH_FAILED);
            return(0);
            }
      
      sk_void_free(dso->meth_data);
      if(dso->filename != NULL)
            OPENSSL_free(dso->filename);
      if(dso->loaded_filename != NULL)
            OPENSSL_free(dso->loaded_filename);
 
      OPENSSL_free(dso);
      return(1);
      }

int DSO_flags(DSO *dso)
      {
      return((dso == NULL) ? 0 : dso->flags);
      }


int DSO_up_ref(DSO *dso)
      {
      if (dso == NULL)
            {
            DSOerr(DSO_F_DSO_UP_REF,ERR_R_PASSED_NULL_PARAMETER);
            return(0);
            }

      CRYPTO_add(&dso->references,1,CRYPTO_LOCK_DSO);
      return(1);
      }

DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags)
      {
      DSO *ret;
      int allocated = 0;

      if(dso == NULL)
            {
            ret = DSO_new_method(meth);
            if(ret == NULL)
                  {
                  DSOerr(DSO_F_DSO_LOAD,ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            allocated = 1;
            /* Pass the provided flags to the new DSO object */
            if(DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0)
                  {
                  DSOerr(DSO_F_DSO_LOAD,DSO_R_CTRL_FAILED);
                  goto err;
                  }
            }
      else
            ret = dso;
      /* Don't load if we're currently already loaded */
      if(ret->filename != NULL)
            {
            DSOerr(DSO_F_DSO_LOAD,DSO_R_DSO_ALREADY_LOADED);
            goto err;
            }
      /* filename can only be NULL if we were passed a dso that already has
       * one set. */
      if(filename != NULL)
            if(!DSO_set_filename(ret, filename))
                  {
                  DSOerr(DSO_F_DSO_LOAD,DSO_R_SET_FILENAME_FAILED);
                  goto err;
                  }
      filename = ret->filename;
      if(filename == NULL)
            {
            DSOerr(DSO_F_DSO_LOAD,DSO_R_NO_FILENAME);
            goto err;
            }
      if(ret->meth->dso_load == NULL)
            {
            DSOerr(DSO_F_DSO_LOAD,DSO_R_UNSUPPORTED);
            goto err;
            }
      if(!ret->meth->dso_load(ret))
            {
            DSOerr(DSO_F_DSO_LOAD,DSO_R_LOAD_FAILED);
            goto err;
            }
      /* Load succeeded */
      return(ret);
err:
      if(allocated)
            DSO_free(ret);
      return(NULL);
      }

void *DSO_bind_var(DSO *dso, const char *symname)
      {
      void *ret = NULL;

      if((dso == NULL) || (symname == NULL))
            {
            DSOerr(DSO_F_DSO_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
            return(NULL);
            }
      if(dso->meth->dso_bind_var == NULL)
            {
            DSOerr(DSO_F_DSO_BIND_VAR,DSO_R_UNSUPPORTED);
            return(NULL);
            }
      if((ret = dso->meth->dso_bind_var(dso, symname)) == NULL)
            {
            DSOerr(DSO_F_DSO_BIND_VAR,DSO_R_SYM_FAILURE);
            return(NULL);
            }
      /* Success */
      return(ret);
      }

DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname)
      {
      DSO_FUNC_TYPE ret = NULL;

      if((dso == NULL) || (symname == NULL))
            {
            DSOerr(DSO_F_DSO_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
            return(NULL);
            }
      if(dso->meth->dso_bind_func == NULL)
            {
            DSOerr(DSO_F_DSO_BIND_FUNC,DSO_R_UNSUPPORTED);
            return(NULL);
            }
      if((ret = dso->meth->dso_bind_func(dso, symname)) == NULL)
            {
            DSOerr(DSO_F_DSO_BIND_FUNC,DSO_R_SYM_FAILURE);
            return(NULL);
            }
      /* Success */
      return(ret);
      }

/* I don't really like these *_ctrl functions very much to be perfectly
 * honest. For one thing, I think I have to return a negative value for
 * any error because possible DSO_ctrl() commands may return values
 * such as "size"s that can legitimately be zero (making the standard
 * "if(DSO_cmd(...))" form that works almost everywhere else fail at
 * odd times. I'd prefer "output" values to be passed by reference and
 * the return value as success/failure like usual ... but we conform
 * when we must... :-) */
long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg)
      {
      if(dso == NULL)
            {
            DSOerr(DSO_F_DSO_CTRL,ERR_R_PASSED_NULL_PARAMETER);
            return(-1);
            }
      /* We should intercept certain generic commands and only pass control
       * to the method-specific ctrl() function if it's something we don't
       * handle. */
      switch(cmd)
            {
      case DSO_CTRL_GET_FLAGS:
            return dso->flags;
      case DSO_CTRL_SET_FLAGS:
            dso->flags = (int)larg;
            return(0);
      case DSO_CTRL_OR_FLAGS:
            dso->flags |= (int)larg;
            return(0);
      default:
            break;
            }
      if((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL))
            {
            DSOerr(DSO_F_DSO_CTRL,DSO_R_UNSUPPORTED);
            return(-1);
            }
      return(dso->meth->dso_ctrl(dso,cmd,larg,parg));
      }

int DSO_set_name_converter(DSO *dso, DSO_NAME_CONVERTER_FUNC cb,
                  DSO_NAME_CONVERTER_FUNC *oldcb)
      {
      if(dso == NULL)
            {
            DSOerr(DSO_F_DSO_SET_NAME_CONVERTER,
                        ERR_R_PASSED_NULL_PARAMETER);
            return(0);
            }
      if(oldcb)
            *oldcb = dso->name_converter;
      dso->name_converter = cb;
      return(1);
      }

const char *DSO_get_filename(DSO *dso)
      {
      if(dso == NULL)
            {
            DSOerr(DSO_F_DSO_GET_FILENAME,ERR_R_PASSED_NULL_PARAMETER);
            return(NULL);
            }
      return(dso->filename);
      }

int DSO_set_filename(DSO *dso, const char *filename)
      {
      char *copied;

      if((dso == NULL) || (filename == NULL))
            {
            DSOerr(DSO_F_DSO_SET_FILENAME,ERR_R_PASSED_NULL_PARAMETER);
            return(0);
            }
      if(dso->loaded_filename)
            {
            DSOerr(DSO_F_DSO_SET_FILENAME,DSO_R_DSO_ALREADY_LOADED);
            return(0);
            }
      /* We'll duplicate filename */
      copied = OPENSSL_malloc(strlen(filename) + 1);
      if(copied == NULL)
            {
            DSOerr(DSO_F_DSO_SET_FILENAME,ERR_R_MALLOC_FAILURE);
            return(0);
            }
      BUF_strlcpy(copied, filename, strlen(filename) + 1);
      if(dso->filename)
            OPENSSL_free(dso->filename);
      dso->filename = copied;
      return(1);
      }

char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2)
      {
      char *result = NULL;

      if(dso == NULL || filespec1 == NULL)
            {
            DSOerr(DSO_F_DSO_MERGE,ERR_R_PASSED_NULL_PARAMETER);
            return(NULL);
            }
      if((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0)
            {
            if(dso->merger != NULL)
                  result = dso->merger(dso, filespec1, filespec2);
            else if(dso->meth->dso_merger != NULL)
                  result = dso->meth->dso_merger(dso,
                        filespec1, filespec2);
            }
      return(result);
      }

char *DSO_convert_filename(DSO *dso, const char *filename)
      {
      char *result = NULL;

      if(dso == NULL)
            {
            DSOerr(DSO_F_DSO_CONVERT_FILENAME,ERR_R_PASSED_NULL_PARAMETER);
            return(NULL);
            }
      if(filename == NULL)
            filename = dso->filename;
      if(filename == NULL)
            {
            DSOerr(DSO_F_DSO_CONVERT_FILENAME,DSO_R_NO_FILENAME);
            return(NULL);
            }
      if((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0)
            {
            if(dso->name_converter != NULL)
                  result = dso->name_converter(dso, filename);
            else if(dso->meth->dso_name_converter != NULL)
                  result = dso->meth->dso_name_converter(dso, filename);
            }
      if(result == NULL)
            {
            result = OPENSSL_malloc(strlen(filename) + 1);
            if(result == NULL)
                  {
                  DSOerr(DSO_F_DSO_CONVERT_FILENAME,
                              ERR_R_MALLOC_FAILURE);
                  return(NULL);
                  }
            BUF_strlcpy(result, filename, strlen(filename) + 1);
            }
      return(result);
      }

const char *DSO_get_loaded_filename(DSO *dso)
      {
      if(dso == NULL)
            {
            DSOerr(DSO_F_DSO_GET_LOADED_FILENAME,
                        ERR_R_PASSED_NULL_PARAMETER);
            return(NULL);
            }
      return(dso->loaded_filename);
      }

int DSO_pathbyaddr(void *addr,char *path,int sz)
      {
      DSO_METHOD *meth = default_DSO_meth;
      if (meth == NULL) meth = DSO_METHOD_openssl();
      if (meth->pathbyaddr == NULL)
            {
            DSOerr(DSO_F_DSO_PATHBYADDR,DSO_R_UNSUPPORTED);
            return -1;
            }
      return (*meth->pathbyaddr)(addr,path,sz);
      }

void *DSO_global_lookup(const char *name)
      {
      DSO_METHOD *meth = default_DSO_meth;
      if (meth == NULL) meth = DSO_METHOD_openssl();
      if (meth->globallookup == NULL)
            {
            DSOerr(DSO_F_DSO_GLOBAL_LOOKUP,DSO_R_UNSUPPORTED);
            return NULL;
            }
      return (*meth->globallookup)(name);
      }

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