This is a set of startup code for the DSO support, it's not yet linked into

the build process (an upcoming commit no doubt), and is very much *new*
code - what that means is that it compiles ok - usually. It certainly
doesn't mean it runs well or even properly yet. Please don't muck round
with this unless you're looking to help out and hunt bugs. :-)

Currently this code doesn't have any support for controlling the "load"
behaviour (eg. paths, filename translations, etc). That'll be handled
using DSO_ctrl() and various flags, once we work out a sensible set of
flags.

1 files changed, 191 insertions, 0 deletions

diff --git a/crypto/dso/dso.h b/crypto/dso/dso.h
new file mode 100644
index 0000000000..5f86eb3ff8
--- /dev/null
+++ b/crypto/dso/dso.h
@@ -0,0 +1,191 @@
+/* dso.h */
+/* 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).
+ *
+ */
+
+#ifndef HEADER_DSO_H
+#define HEADER_DSO_H
+
+#include <openssl/crypto.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+typedef struct dso_st DSO;
+
+typedef struct dso_meth_st
+	{
+	const char *name;
+	/* Loads a shared library */
+	int (*dso_load)(DSO *dso, char *filename);
+	/* Unloads a shared library */
+	int (*dso_unload)(DSO *dso);
+	/* Binds a function, variable, or whatever */
+	int (*dso_bind)(DSO *dso, char *symname, void **symptr);
+
+/* I don't think this would actually be used in any circumstances. */
+#if 0
+	/* Unbinds a symbol */
+	int (*dso_unbind)(DSO *dso, char *symname, void *symptr);
+#endif
+
+	int (*init)(DSO *dso);
+	int (*finish)(DSO *dso);
+	} DSO_METHOD;
+
+/**********************************************************************/
+/* The low-level handle type used to refer to a loaded shared library */
+
+struct dso_st
+	{
+	DSO_METHOD *meth;
+	/* Standard dlopen uses a (void *). Win32 uses a HANDLE. VMS
+	 * doesn't use anything but will need to cache the filename
+	 * for use in the dso_bind handler. All in all, let each
+	 * method control its own destiny. "Handles" and such go in
+	 * a STACK. */
+	STACK *meth_data;
+	int references;
+	int flags;
+	/* For use by applications etc ... use this for your bits'n'pieces,
+	 * don't touch meth_data! */
+	CRYPTO_EX_DATA ex_data;
+	};
+
+
+DSO *	DSO_new(void);
+DSO *	DSO_new_method(DSO_METHOD *method);
+int	DSO_free(DSO *dso);
+int	DSO_flags(DSO *dso);
+int	DSO_up(DSO *dso);
+
+void DSO_set_default_method(DSO_METHOD *meth);
+DSO_METHOD *DSO_get_default_method(void);
+DSO_METHOD *DSO_get_method(DSO *dso);
+DSO_METHOD *DSO_set_method(DSO *dso, DSO_METHOD *meth);
+
+/* The all-singing all-dancing load function, you normally pass NULL
+ * for the last two parameters. Use DSO_up and DSO_free for reference
+ * count handling. */
+DSO *DSO_load(DSO *dso, char *filename, DSO_METHOD *meth);
+
+/* This function binds to a function, variable, whatever inside a
+ * shared library. */
+void *DSO_bind(DSO *dso, char *symname);
+
+/* This method is the default, but will beg, borrow, or steal whatever
+ * method should be the default on any particular platform (including
+ * DSO_METH_null() if necessary). */
+DSO_METHOD *DSO_METHOD_openssl(void);
+
+/* This method is defined for all platforms - if a platform has no
+ * DSO support then this will be the only method! */
+DSO_METHOD *DSO_METHOD_null(void);
+
+/* If DSO_DLFCN is defined, the standard dlfcn.h-style functions
+ * (dlopen, dlclose, dlsym, etc) will be used and incorporated into
+ * this method. If not, this method will return NULL. */
+DSO_METHOD *DSO_METHOD_dlfcn(void);
+
+/* If DSO_DL is defined, the standard dl.h-style functions (shl_load, 
+ * shl_unload, shl_findsym, etc) will be used and incorporated into
+ * this method. If not, this method will return NULL. */
+DSO_METHOD *DSO_METHOD_dl(void);
+
+/* If WIN32 is defined, use DLLs. If not, return NULL. */
+DSO_METHOD *DSO_METHOD_win32(void);
+
+void ERR_load_DSO_strings(void);
+
+/* BEGIN ERROR CODES */
+/* The following lines are auto generated by the script mkerr.pl. Any changes
+ * made after this point may be overwritten when the script is next run.
+ */
+
+/* Error codes for the DSO functions. */
+
+/* Function codes. */
+#define DSO_F_DLFCN_BIND				 100
+#define DSO_F_DLFCN_LOAD				 101
+#define DSO_F_DLFCN_UNLOAD				 102
+#define DSO_F_DL_BIND					 103
+#define DSO_F_DL_LOAD					 104
+#define DSO_F_DL_UNLOAD					 105
+#define DSO_F_DSO_BIND					 106
+#define DSO_F_DSO_FREE					 107
+#define DSO_F_DSO_LOAD					 108
+#define DSO_F_DSO_NEW_METHOD				 109
+#define DSO_F_DSO_UP					 110
+#define DSO_F_WIN32_BIND				 111
+#define DSO_F_WIN32_LOAD				 112
+#define DSO_F_WIN32_UNLOAD				 113
+
+/* Reason codes. */
+#define DSO_R_FINISH_FAILED				 100
+#define DSO_R_LOAD_FAILED				 101
+#define DSO_R_NULL_HANDLE				 102
+#define DSO_R_STACK_ERROR				 103
+#define DSO_R_SYM_FAILURE				 104
+#define DSO_R_UNLOAD_FAILED				 105
+#define DSO_R_UNSUPPORTED				 106
+
+#ifdef  __cplusplus
+}
+#endif
+#endif
+