/* 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).

  *

  */

  /*

  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

  */

 #include <stdio.h>

 #include "cryptlib.h"

 #include <openssl/dso.h>

 #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

 #include "libcrypto_wsd_macros.h"

 #include "libcrypto_wsd.h"

 #endif

 #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);

 #ifndef EMULATOR

 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 */

 	};

 #else

 GET_STATIC_VAR_FROM_TLS(dso_meth_dlfcn,dso_dlfcn,DSO_METHOD)

 #define dso_meth_dlfcn (*GET_WSD_VAR_NAME(dso_meth_dlfcn,dso_dlfcn, s)())

 const DSO_METHOD temp_s_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 */

 	};

 #endif

 EXPORT_C 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)

 		{

 #ifndef SYMBIAN		

 		/* 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" */

 #else

 	/* We will convert this to "%s.dll" or "lib%s.dll" */

 		rsize += 4;	/* The length of ".dll" */

 		if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)

 			rsize += 3; /* The length of "lib" */

 #endif			

 		}

 	translated = OPENSSL_malloc(rsize);

 	if(translated == NULL)

 		{

 		DSOerr(DSO_F_DLFCN_NAME_CONVERTER,

 				DSO_R_NAME_TRANSLATION_FAILED);

 		return(NULL);

 		}

 	if(transform)

 		{

 #ifndef SYMBIAN		

 		if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)

 			sprintf(translated, "lib%s.so", filename);

 		else

 			sprintf(translated, "%s.so", filename);

 #else

 		if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)

 			sprintf(translated, "lib%s.dll", filename);

 		else

 			sprintf(translated, "%s.dll", filename);

 #endif		

 		}

 	else

 		sprintf(translated, "%s", filename);

 	return(translated);

 	}

 #endif /* DSO_DLFCN */