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-rw-r--r--crypto/dso/dso_locl.h107
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diff --git a/crypto/dso/dso_locl.h b/crypto/dso/dso_locl.h
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+/*
+ * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <stdio.h>
+#include "internal/cryptlib.h"
+#include "internal/dso.h"
+#include "internal/dso_conf.h"
+#include "internal/refcount.h"
+
+/**********************************************************************/
+/* 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_OF(void) *meth_data;
+ CRYPTO_REF_COUNT 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;
+ /*
+ * If this callback function pointer is set to non-NULL, then it will be
+ * used in DSO_load() in place of meth->dso_name_converter. NB: This
+ * should normally set using DSO_set_name_converter().
+ */
+ DSO_NAME_CONVERTER_FUNC name_converter;
+ /*
+ * If this callback function pointer is set to non-NULL, then it will be
+ * used in DSO_load() in place of meth->dso_merger. NB: This should
+ * normally set using DSO_set_merger().
+ */
+ DSO_MERGER_FUNC merger;
+ /*
+ * This is populated with (a copy of) the platform-independent filename
+ * used for this DSO.
+ */
+ char *filename;
+ /*
+ * This is populated with (a copy of) the translated filename by which
+ * the DSO was actually loaded. It is NULL iff the DSO is not currently
+ * loaded. NB: This is here because the filename translation process may
+ * involve a callback being invoked more than once not only to convert to
+ * a platform-specific form, but also to try different filenames in the
+ * process of trying to perform a load. As such, this variable can be
+ * used to indicate (a) whether this DSO structure corresponds to a
+ * loaded library or not, and (b) the filename with which it was actually
+ * loaded.
+ */
+ char *loaded_filename;
+ CRYPTO_RWLOCK *lock;
+};
+
+struct dso_meth_st {
+ const char *name;
+ /*
+ * Loads a shared library, NB: new DSO_METHODs must ensure that a
+ * successful load populates the loaded_filename field, and likewise a
+ * successful unload OPENSSL_frees and NULLs it out.
+ */
+ int (*dso_load) (DSO *dso);
+ /* Unloads a shared library */
+ int (*dso_unload) (DSO *dso);
+ /*
+ * Binds a function - assumes a return type of DSO_FUNC_TYPE. This should
+ * be cast to the real function prototype by the caller. Platforms that
+ * don't have compatible representations for different prototypes (this
+ * is possible within ANSI C) are highly unlikely to have shared
+ * libraries at all, let alone a DSO_METHOD implemented for them.
+ */
+ DSO_FUNC_TYPE (*dso_bind_func) (DSO *dso, const char *symname);
+ /*
+ * The generic (yuck) "ctrl()" function. NB: Negative return values
+ * (rather than zero) indicate errors.
+ */
+ long (*dso_ctrl) (DSO *dso, int cmd, long larg, void *parg);
+ /*
+ * The default DSO_METHOD-specific function for converting filenames to a
+ * canonical native form.
+ */
+ DSO_NAME_CONVERTER_FUNC dso_name_converter;
+ /*
+ * The default DSO_METHOD-specific function for converting filenames to a
+ * canonical native form.
+ */
+ DSO_MERGER_FUNC dso_merger;
+ /* [De]Initialisation handlers. */
+ int (*init) (DSO *dso);
+ int (*finish) (DSO *dso);
+ /* Return pathname of the module containing location */
+ int (*pathbyaddr) (void *addr, char *path, int sz);
+ /* Perform global symbol lookup, i.e. among *all* modules */
+ void *(*globallookup) (const char *symname);
+};