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dso_dlfcn.c

/* dso_dlfcn.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 "cryptlib.h"
#include <openssl/dso.h>

#ifndef DSO_DLFCN
DSO_METHOD *DSO_METHOD_dlfcn(void)
      {
      return NULL;
      }
#else

#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif

/* Part of the hack in "dlfcn_load" ... */
#define DSO_MAX_TRANSLATED_SIZE 256

static int dlfcn_load(DSO *dso);
static int dlfcn_unload(DSO *dso);
static void *dlfcn_bind_var(DSO *dso, const char *symname);
static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
#if 0
static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
static int dlfcn_init(DSO *dso);
static int dlfcn_finish(DSO *dso);
static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
#endif
static char *dlfcn_name_converter(DSO *dso, const char *filename);
static char *dlfcn_merger(DSO *dso, const char *filespec1,
      const char *filespec2);

static DSO_METHOD dso_meth_dlfcn = {
      "OpenSSL 'dlfcn' shared library method",
      dlfcn_load,
      dlfcn_unload,
      dlfcn_bind_var,
      dlfcn_bind_func,
/* For now, "unbind" doesn't exist */
#if 0
      NULL, /* unbind_var */
      NULL, /* unbind_func */
#endif
      NULL, /* ctrl */
      dlfcn_name_converter,
      dlfcn_merger,
      NULL, /* init */
      NULL  /* finish */
      };

DSO_METHOD *DSO_METHOD_dlfcn(void)
      {
      return(&dso_meth_dlfcn);
      }

/* Prior to using the dlopen() function, we should decide on the flag
 * we send. There's a few different ways of doing this and it's a
 * messy venn-diagram to match up which platforms support what. So
 * as we don't have autoconf yet, I'm implementing a hack that could
 * be hacked further relatively easily to deal with cases as we find
 * them. Initially this is to cope with OpenBSD. */
#if defined(__OpenBSD__) || defined(__NetBSD__)
#     ifdef DL_LAZY
#           define DLOPEN_FLAG DL_LAZY
#     else
#           ifdef RTLD_NOW
#                 define DLOPEN_FLAG RTLD_NOW
#           else
#                 define DLOPEN_FLAG 0
#           endif
#     endif
#else
#     ifdef OPENSSL_SYS_SUNOS
#           define DLOPEN_FLAG 1
#     else
#           define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
#     endif
#endif

/* For this DSO_METHOD, our meth_data STACK will contain;
 * (i) the handle (void*) returned from dlopen().
 */

static int dlfcn_load(DSO *dso)
      {
      void *ptr = NULL;
      /* See applicable comments in dso_dl.c */
      char *filename = DSO_convert_filename(dso, NULL);
      int flags = DLOPEN_FLAG;

      if(filename == NULL)
            {
            DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
            goto err;
            }

#ifdef RTLD_GLOBAL
      if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
            flags |= RTLD_GLOBAL;
#endif
      ptr = dlopen(filename, flags);
      if(ptr == NULL)
            {
            DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
            ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
            goto err;
            }
      if(!sk_push(dso->meth_data, (char *)ptr))
            {
            DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR);
            goto err;
            }
      /* Success */
      dso->loaded_filename = filename;
      return(1);
err:
      /* Cleanup! */
      if(filename != NULL)
            OPENSSL_free(filename);
      if(ptr != NULL)
            dlclose(ptr);
      return(0);
}

static int dlfcn_unload(DSO *dso)
      {
      void *ptr;
      if(dso == NULL)
            {
            DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
            return(0);
            }
      if(sk_num(dso->meth_data) < 1)
            return(1);
      ptr = (void *)sk_pop(dso->meth_data);
      if(ptr == NULL)
            {
            DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE);
            /* Should push the value back onto the stack in
             * case of a retry. */
            sk_push(dso->meth_data, (char *)ptr);
            return(0);
            }
      /* For now I'm not aware of any errors associated with dlclose() */
      dlclose(ptr);
      return(1);
      }

static void *dlfcn_bind_var(DSO *dso, const char *symname)
      {
      void *ptr, *sym;

      if((dso == NULL) || (symname == NULL))
            {
            DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
            return(NULL);
            }
      if(sk_num(dso->meth_data) < 1)
            {
            DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR);
            return(NULL);
            }
      ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
      if(ptr == NULL)
            {
            DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE);
            return(NULL);
            }
      sym = dlsym(ptr, symname);
      if(sym == NULL)
            {
            DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE);
            ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
            return(NULL);
            }
      return(sym);
      }

static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
      {
      void *ptr;
      DSO_FUNC_TYPE sym, *tsym = &sym;

      if((dso == NULL) || (symname == NULL))
            {
            DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
            return(NULL);
            }
      if(sk_num(dso->meth_data) < 1)
            {
            DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR);
            return(NULL);
            }
      ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
      if(ptr == NULL)
            {
            DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE);
            return(NULL);
            }
      *(void **)(tsym) = dlsym(ptr, symname);
      if(sym == NULL)
            {
            DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE);
            ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
            return(NULL);
            }
      return(sym);
      }

static char *dlfcn_merger(DSO *dso, const char *filespec1,
      const char *filespec2)
      {
      char *merged;

      if(!filespec1 && !filespec2)
            {
            DSOerr(DSO_F_DLFCN_MERGER,
                        ERR_R_PASSED_NULL_PARAMETER);
            return(NULL);
            }
      /* If the first file specification is a rooted path, it rules.
         same goes if the second file specification is missing. */
      if (!filespec2 || filespec1[0] == '/')
            {
            merged = OPENSSL_malloc(strlen(filespec1) + 1);
            if(!merged)
                  {
                  DSOerr(DSO_F_DLFCN_MERGER,
                        ERR_R_MALLOC_FAILURE);
                  return(NULL);
                  }
            strcpy(merged, filespec1);
            }
      /* If the first file specification is missing, the second one rules. */
      else if (!filespec1)
            {
            merged = OPENSSL_malloc(strlen(filespec2) + 1);
            if(!merged)
                  {
                  DSOerr(DSO_F_DLFCN_MERGER,
                        ERR_R_MALLOC_FAILURE);
                  return(NULL);
                  }
            strcpy(merged, filespec2);
            }
      else
            /* This part isn't as trivial as it looks.  It assumes that
               the second file specification really is a directory, and
               makes no checks whatsoever.  Therefore, the result becomes
               the concatenation of filespec2 followed by a slash followed
               by filespec1. */
            {
            int spec2len, len;

            spec2len = (filespec2 ? strlen(filespec2) : 0);
            len = spec2len + (filespec1 ? strlen(filespec1) : 0);

            if(filespec2 && filespec2[spec2len - 1] == '/')
                  {
                  spec2len--;
                  len--;
                  }
            merged = OPENSSL_malloc(len + 2);
            if(!merged)
                  {
                  DSOerr(DSO_F_DLFCN_MERGER,
                        ERR_R_MALLOC_FAILURE);
                  return(NULL);
                  }
            strcpy(merged, filespec2);
            merged[spec2len] = '/';
            strcpy(&merged[spec2len + 1], filespec1);
            }
      return(merged);
      }

static char *dlfcn_name_converter(DSO *dso, const char *filename)
      {
      char *translated;
      int len, rsize, transform;

      len = strlen(filename);
      rsize = len + 1;
      transform = (strstr(filename, "/") == NULL);
      if(transform)
            {
            /* We will convert this to "%s.so" or "lib%s.so" */
            rsize += 3; /* The length of ".so" */
            if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
                  rsize += 3; /* The length of "lib" */
            }
      translated = OPENSSL_malloc(rsize);
      if(translated == NULL)
            {
            DSOerr(DSO_F_DLFCN_NAME_CONVERTER,
                        DSO_R_NAME_TRANSLATION_FAILED);
            return(NULL);
            }
      if(transform)
            {
            if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
                  sprintf(translated, "lib%s.so", filename);
            else
                  sprintf(translated, "%s.so", filename);
            }
      else
            sprintf(translated, "%s", filename);
      return(translated);
      }

#endif /* DSO_DLFCN */

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