/* dso_dlfcn.c *//* 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). * */#ifdef __linux#define _GNU_SOURCE#endif#include <stdio.h>#include "cryptlib.h"#include <openssl/dso.h>#ifndef DSO_DLFCNDSO_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 256static 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 0static 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);#endifstatic char *dlfcn_name_converter(DSO *dso, const char *filename);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,	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);	if(filename == NULL)		{		DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);		goto err;		}	ptr = dlopen(filename, DLOPEN_FLAG);	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_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);	}#ifdef OPENSSL_FIPSstatic void dlfcn_ref_point(){}int DSO_pathbyaddr(void *addr,char *path,int sz)	{	Dl_info dli;	int len;	if (addr == NULL)		{		union { void(*f)(void); void *p; } t = { dlfcn_ref_point };		addr = t.p;		}	if (dladdr(addr,&dli))		{		len = (int)strlen(dli.dli_fname);		if (sz <= 0) return len+1;		if (len >= sz) len=sz-1;		memcpy(path,dli.dli_fname,len);		path[len++]=0;		return len;		}	ERR_add_error_data(4, "dlfcn_pathbyaddr(): ", dlerror());	return -1;	}#endif#endif /* DSO_DLFCN */