/* dso_vms.c */
/* Written by Richard Levitte (richard@levitte.org) 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 <string.h>
#include <errno.h>
#ifdef VMS
#pragma message disable DOLLARID
#include <lib$routines.h>
#include <libfisdef.h>
#include <stsdef.h>
#include <descrip.h>
#include <starlet.h>
#endif
#include "cryptlib.h"
#include <openssl/dso.h>

#ifndef VMS
DSO_METHOD *DSO_METHOD_vms(void)
	{
	return NULL;
	}
#else
#pragma message disable DOLLARID

static int vms_load(DSO *dso);
static int vms_unload(DSO *dso);
static void *vms_bind_var(DSO *dso, const char *symname);
static DSO_FUNC_TYPE vms_bind_func(DSO *dso, const char *symname);
#if 0
static int vms_unbind_var(DSO *dso, char *symname, void *symptr);
static int vms_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
static int vms_init(DSO *dso);
static int vms_finish(DSO *dso);
static long vms_ctrl(DSO *dso, int cmd, long larg, void *parg);
#endif
static char *vms_name_converter(DSO *dso);

static DSO_METHOD dso_meth_vms = {
	"OpenSSL 'VMS' shared library method",
	vms_load,
	NULL, /* unload */
	vms_bind_var,
	vms_bind_func,
/* For now, "unbind" doesn't exist */
#if 0
	NULL, /* unbind_var */
	NULL, /* unbind_func */
#endif
	NULL, /* ctrl */
	vms_name_converter,
	NULL, /* init */
	NULL  /* finish */
	};

/* On VMS, the only "handle" is the file name.  LIB$FIND_IMAGE_SYMBOL depends
 * on the reference to the file name being the same for all calls regarding
 * one shared image, so we'll just store it in an instance of the following
 * structure and put a pointer to that instance in the meth_data stack.
 */
typedef struct dso_internal_st
	{
	/* This should contain the name only, no directory,
	 * no extension, nothing but a name. */
	struct dsc$descriptor_s filename_dsc;
	char filename[FILENAME_MAX+1];
	/* This contains whatever is not in filename, if needed.
	 * Normally not defined. */
	struct dsc$descriptor_s imagename_dsc;
	char imagename[FILENAME_MAX+1];
	} DSO_VMS_INTERNAL;


DSO_METHOD *DSO_METHOD_vms(void)
	{
	return(&dso_meth_vms);
	}

static int vms_load(DSO *dso)
	{
#if 0
	DSO_VMS_INTERNAL *p;
	const char *sp1, *sp2;	/* Search result */

	/* A file specification may look like this:
	 *
	 *	node::dev:[dir-spec]name.type;ver
	 *
	 * or (for compatibility with TOPS-20):
	 *
	 *	node::dev:<dir-spec>name.type;ver
	 *
	 * and the dir-spec uses '.' as separator.  Also, a dir-spec
	 * may consist of several parts, with mixed use of [] and <>:
	 *
	 *	[dir1.]<dir2>
	 *
	 * We need to split the file specification into the name and
	 * the rest (both before and after the name itself).
	 */
	/* Start with trying to find the end of a dir-spec, and save the
	   position of the byte after in sp1 */
	sp1 = strrchr(filename, ']');
	sp2 = strrchr(filename, '>');
	if (sp1 == NULL) sp1 = sp2;
	if (sp2 != NULL && sp2 > sp1) sp1 = sp2;
	if (sp1 == NULL) sp1 = strrchr(filename, ':');
	if (sp1 == NULL)
		sp1 = filename;
	else
		sp1++;		/* The byte after the found character */
	/* Now, let's see if there's a type, and save the position in sp2 */
	sp2 = strchr(sp1, '.');
	/* If we found it, that's where we'll cut.  Otherwise, look for a
	   version number and save the position in sp2 */
	if (sp2 == NULL) sp2 = strchr(sp1, ';');
	/* If there was still nothing to find, set sp2 to point at the end of
	   the string */
	if (sp2 == NULL) sp2 = sp1 + strlen(sp1);

	/* Check that we won't get buffer overflows */
	if (sp2 - sp1 > FILENAME_MAX
		|| (sp1 - filename) + strlen(sp2) > FILENAME_MAX)
		{
		DSOerr(DSO_F_VMS_LOAD,DSO_R_FILENAME_TOO_BIG);
		return(0);
		}

	p = (DSO_VMS_INTERNAL *)OPENSSL_malloc(sizeof(DSO_VMS_INTERNAL));
	if(p == NULL)
		{
		DSOerr(DSO_F_VMS_LOAD,ERR_R_MALLOC_FAILURE);
		return(0);
		}

	strncpy(p->filename, sp1, sp2-sp1);
	p->filename[sp2-sp1] = '\0';

	strncpy(p->imagename, filename, sp1-filename);
	p->imagename[sp1-filename] = '\0';
	strcat(p->imagename, sp2);

	p->filename_dsc.dsc$w_length = strlen(p->filename);
	p->filename_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
	p->filename_dsc.dsc$b_class = DSC$K_CLASS_S;
	p->filename_dsc.dsc$a_pointer = p->filename;
	p->imagename_dsc.dsc$w_length = strlen(p->imagename);
	p->imagename_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
	p->imagename_dsc.dsc$b_class = DSC$K_CLASS_S;
	p->imagename_dsc.dsc$a_pointer = p->imagename;

	if(!sk_push(dso->meth_data, (char *)p))
		{
		DSOerr(DSO_F_VMS_LOAD,DSO_R_STACK_ERROR);
		OPENSSL_free(p);
		return(0);
		}
	return(1);
#else
	/* See the comments lower down in the vms_name_converter
	 * "implementation" :-) */
	please_break_compilation();
	return(bother_richard);
#endif
	}

/* Note that this doesn't actually unload the shared image, as there is no
 * such thing in VMS.  Next time it get loaded again, a new copy will
 * actually be loaded.
 */
static int vms_unload(DSO *dso)
	{
	DSO_VMS_INTERNAL *p;
	if(dso == NULL)
		{
		DSOerr(DSO_F_VMS_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
		return(0);
		}
	if(sk_num(dso->meth_data) < 1)
		return(1);
	p = (DSO_VMS_INTERNAL *)sk_pop(dso->meth_data);
	if(p == NULL)
		{
		DSOerr(DSO_F_VMS_UNLOAD,DSO_R_NULL_HANDLE);
		return(0);
		}
	/* Cleanup */
	OPENSSL_free(p);
	return(1);
	}

/* We must do this in a separate function because of the way the exception
   handler works (it makes this function return */
static int do_find_symbol(DSO_VMS_INTERNAL *ptr,
	struct dsc$descriptor_s *symname_dsc, void **sym,
	unsigned long flags)
	{
	/* Make sure that signals are caught and returned instead of
	   aborting the program.  The exception handler gets unestablished
	   automatically on return from this function.  */
	lib$establish(lib$sig_to_ret);

	if(ptr->imagename_dsc.dsc$w_length)
		return lib$find_image_symbol(&ptr->filename_dsc,
			symname_dsc, sym,
			&ptr->imagename_dsc, flags);
	else
		return lib$find_image_symbol(&ptr->filename_dsc,
			symname_dsc, sym,
			0, flags);
	}

void vms_bind_sym(DSO *dso, const char *symname, void **sym)
	{
	DSO_VMS_INTERNAL *ptr;
	int status;
	int flags = LIB$M_FIS_MIXEDCASE;
	struct dsc$descriptor_s symname_dsc;
	*sym = NULL;

	symname_dsc.dsc$w_length = strlen(symname);
	symname_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
	symname_dsc.dsc$b_class = DSC$K_CLASS_S;
	symname_dsc.dsc$a_pointer = (char *)symname; /* The cast is needed */

	if((dso == NULL) || (symname == NULL))
		{
		DSOerr(DSO_F_VMS_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
		return;
		}
	if(sk_num(dso->meth_data) < 1)
		{
		DSOerr(DSO_F_VMS_BIND_VAR,DSO_R_STACK_ERROR);
		return;
		}
	ptr = (DSO_VMS_INTERNAL *)sk_value(dso->meth_data,
		sk_num(dso->meth_data) - 1);
	if(ptr == NULL)
		{
		DSOerr(DSO_F_VMS_BIND_VAR,DSO_R_NULL_HANDLE);
		return;
		}

	if(dso->flags & DSO_FLAG_UPCASE_SYMBOL) flags = 0;

	status = do_find_symbol(ptr, &symname_dsc, sym, flags);

	if(!$VMS_STATUS_SUCCESS(status))
		{
		unsigned short length;
		char errstring[257];
		struct dsc$descriptor_s errstring_dsc;

		errstring_dsc.dsc$w_length = sizeof(errstring);
		errstring_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
		errstring_dsc.dsc$b_class = DSC$K_CLASS_S;
		errstring_dsc.dsc$a_pointer = errstring;

		*sym = NULL;

		status = sys$getmsg(status, &length, &errstring_dsc, 1, 0);

		if (!$VMS_STATUS_SUCCESS(status))
			lib$signal(status); /* This is really bad.  Abort!  */
		else
			{
			errstring[length] = '\0';

			DSOerr(DSO_F_VMS_BIND_VAR,DSO_R_SYM_FAILURE);
			if (ptr->imagename_dsc.dsc$w_length)
				ERR_add_error_data(9,
					"Symbol ", symname,
					" in ", ptr->filename,
					" (", ptr->imagename, ")",
					": ", errstring);
			else
				ERR_add_error_data(6,
					"Symbol ", symname,
					" in ", ptr->filename,
					": ", errstring);
			}
		return;
		}
	return;
	}

static void *vms_bind_var(DSO *dso, const char *symname)
	{
	void *sym = 0;
	vms_bind_sym(dso, symname, &sym);
	return sym;
	}

static DSO_FUNC_TYPE vms_bind_func(DSO *dso, const char *symname)
	{
	DSO_FUNC_TYPE sym = 0;
	vms_bind_sym(dso, symname, (void **)&sym);
	return sym;
	}

static char *vms_name_converter(DSO *dso)
	{
	/* Implementation note: on VMS is it preferable to do real conversions
	 * here, or to actually have it performed in-line with the bind calls
	 * (given that VMS never actually does a load except implicitly within
	 * the bind functions). Another note: normally (eg. dlfcn), the
	 * DSO_load call will either load, put the loaded filename into the DSO
	 * (which marks it effectively as "read-only"), and return success - or
	 * it will fail. VMS needs to work out what to do - otherwise DSO_load
	 * will always succeed, but leave the DSO looking unloaded (because the
	 * loaded_filename will be NULL still) and then real loading (and
	 * setting of loaded_filename) will only happen during the first bind
	 * call (which should have error checking anyway to prevent you calling
	 * it on an "unloaded" DSO - thus giving VMS *serious* grief). Richard,
	 * what do you think? Is it worth having DSO_load() try to find and pin
	 * itself to a library file (and populate loaded_filename) even though
	 * it's unecessary to actually do a load prior to the first bind call?
	 * I leave it to you ... :-) */
	deliberately_break_compilation_here();
	return(1);
	}

#endif /* VMS */
