'flags' should only be set inside DSO_load() if constructing a new DSO

[openssl.git] / crypto / dso / dso.h

diff --git a/crypto/dso/dso.h b/crypto/dso/dso.h
index bed7c464a647eccc1a9a880494f1ebd6606a019e..a1678454a5ad6f6d0bacb498e367f53a83d05c26 100644 (file)
--- a/crypto/dso/dso.h
+++ b/crypto/dso/dso.h
@@ -70,31 +70,51 @@ extern "C" {
 #define DSO_CTRL_SET_FLAGS     2
 #define DSO_CTRL_OR_FLAGS      3
 
 #define DSO_CTRL_SET_FLAGS     2
 #define DSO_CTRL_OR_FLAGS      3
 

-/* These flags control the translation of file-names from canonical to
- * native. Eg. in the CryptoSwift support, the "dl" and "dlfcn"
- * methods will translate "swift" -> "libswift.so" whereas the "win32"
- * method will translate "swift" -> "swift.dll". NB: Until I can figure
- * out how to be more "conventional" with this, the methods will only
- * honour this flag if it looks like it was passed a file without any
- * path and if the filename is small enough.
- */
-#define DSO_FLAG_NAME_TRANSLATION 0x01
+/* By default, DSO_load() will translate the provided filename into a form
+ * typical for the platform (more specifically the DSO_METHOD) using the
+ * dso_name_converter function of the method. Eg. win32 will transform "blah"
+ * into "blah.dll", and dlfcn will transform it into "libblah.so". The
+ * behaviour can be overriden by setting the name_converter callback in the DSO
+ * object (using DSO_set_name_converter()). This callback could even utilise
+ * the DSO_METHOD's converter too if it only wants to override behaviour for
+ * one or two possible DSO methods. However, the following flag can be set in a
+ * DSO to prevent *any* native name-translation at all - eg. if the caller has
+ * prompted the user for a path to a driver library so the filename should be
+ * interpreted as-is. */
+#define DSO_FLAG_NO_NAME_TRANSLATION           0x01
+/* An extra flag to give if only the extension should be added as
+ * translation.  This is obviously only of importance on Unix and
+ * other operating systems where the translation also may prefix
+ * the name with something, like 'lib', and ignored everywhere else.
+ * This flag is also ignored if DSO_FLAG_NO_NAME_TRANSLATION is used
+ * at the same time. */
+#define DSO_FLAG_NAME_TRANSLATION_EXT_ONLY     0x02

 
 /* The following flag controls the translation of symbol names to upper
  * case.  This is currently only being implemented for OpenVMS.
  */
 
 /* The following flag controls the translation of symbol names to upper
  * case.  This is currently only being implemented for OpenVMS.
  */

-#define DSO_FLAG_UPCASE_SYMBOL    0x02
+#define DSO_FLAG_UPCASE_SYMBOL                 0x10

 
 
 typedef void (*DSO_FUNC_TYPE)(void);
 
 typedef struct dso_st DSO;
 
 
 
 typedef void (*DSO_FUNC_TYPE)(void);
 
 typedef struct dso_st DSO;
 

+/* The function prototype used for method functions (or caller-provided
+ * callbacks) that transform filenames. They are passed a DSO structure pointer
+ * (or NULL if they are to be used independantly of a DSO object) and a
+ * filename to transform. They should either return NULL (if there is an error
+ * condition) or a newly allocated string containing the transformed form that
+ * the caller will need to free with OPENSSL_free() when done. */
+typedef char* (*DSO_NAME_CONVERTER_FUNC)(DSO *, const char *);
+

 typedef struct dso_meth_st
        {
        const char *name;
 typedef struct dso_meth_st
        {
        const char *name;

-       /* Loads a shared library */
-       int (*dso_load)(DSO *dso, const char *filename);
+       /* 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 variable */
        /* Unloads a shared library */
        int (*dso_unload)(DSO *dso);
        /* Binds a variable */


@@ -117,6 +137,9 @@ typedef struct dso_meth_st
        /* 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 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;

 
        /* [De]Initialisation handlers. */
        int (*init)(DSO *dso);
 
        /* [De]Initialisation handlers. */
        int (*init)(DSO *dso);


@@ -140,6 +163,23 @@ struct dso_st
        /* For use by applications etc ... use this for your bits'n'pieces,
         * don't touch meth_data! */
        CRYPTO_EX_DATA ex_data;
        /* 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 on 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;
+       /* This is populated with (a copy of) the platform-independant
+        * 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;

        };
 
 
        };
 
 


@@ -147,10 +187,38 @@ DSO *     DSO_new(void);
 DSO *  DSO_new_method(DSO_METHOD *method);
 int    DSO_free(DSO *dso);
 int    DSO_flags(DSO *dso);
 DSO *  DSO_new_method(DSO_METHOD *method);
 int    DSO_free(DSO *dso);
 int    DSO_flags(DSO *dso);

-int    DSO_up(DSO *dso);
+int    DSO_up_ref(DSO *dso);

 long   DSO_ctrl(DSO *dso, int cmd, long larg, void *parg);
 
 long   DSO_ctrl(DSO *dso, int cmd, long larg, void *parg);
 

-void DSO_set_default_method(DSO_METHOD *meth);
+/* This function sets the DSO's name_converter callback. If it is non-NULL,
+ * then it will be used instead of the associated DSO_METHOD's function. If
+ * oldcb is non-NULL then it is set to the function pointer value being
+ * replaced. Return value is non-zero for success. */
+int    DSO_set_name_converter(DSO *dso, DSO_NAME_CONVERTER_FUNC cb,
+                               DSO_NAME_CONVERTER_FUNC *oldcb);
+/* These functions can be used to get/set the platform-independant filename
+ * used for a DSO. NB: set will fail if the DSO is already loaded. */
+const char *DSO_get_filename(DSO *dso);
+int    DSO_set_filename(DSO *dso, const char *filename);
+/* This function will invoke the DSO's name_converter callback to translate a
+ * filename, or if the callback isn't set it will instead use the DSO_METHOD's
+ * converter. If "filename" is NULL, the "filename" in the DSO itself will be
+ * used. If the DSO_FLAG_NO_NAME_TRANSLATION flag is set, then the filename is
+ * simply duplicated. NB: This function is usually called from within a
+ * DSO_METHOD during the processing of a DSO_load() call, and is exposed so that
+ * caller-created DSO_METHODs can do the same thing. A non-NULL return value
+ * will need to be OPENSSL_free()'d. */
+char   *DSO_convert_filename(DSO *dso, const char *filename);
+/* If the DSO is currently loaded, this returns the filename that it was loaded
+ * under, otherwise it returns NULL. So it is also useful as a test as to
+ * whether the DSO is currently loaded. NB: This will not necessarily return
+ * the same value as DSO_convert_filename(dso, dso->filename), because the
+ * DSO_METHOD's load function may have tried a variety of filenames (with
+ * and/or without the aid of the converters) before settling on the one it
+ * actually loaded. */
+const char *DSO_get_loaded_filename(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);
 DSO_METHOD *DSO_get_default_method(void);
 DSO_METHOD *DSO_get_method(DSO *dso);
 DSO_METHOD *DSO_set_method(DSO *dso, DSO_METHOD *meth);


@@ -159,8 +227,7 @@ DSO_METHOD *DSO_set_method(DSO *dso, DSO_METHOD *meth);
  * for the first and third parameters. Use DSO_up and DSO_free for
  * subsequent reference count handling. Any flags passed in will be set
  * in the constructed DSO after its init() function but before the
  * for the first and third parameters. Use DSO_up and DSO_free for
  * subsequent reference count handling. Any flags passed in will be set
  * in the constructed DSO after its init() function but before the

- * load operation. This will be done with;
- *    DSO_ctrl(dso, DSO_CTRL_SET_FLAGS, flags, NULL); */
+ * load operation. If 'dso' is non-NULL, 'flags' is ignored. */

 DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags);
 
 /* This function binds to a variable inside a shared library. */
 DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags);
 
 /* This function binds to a variable inside a shared library. */


@@ -200,46 +267,54 @@ void ERR_load_DSO_strings(void);
 /* 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.
  */
 /* 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.
  */

+void ERR_load_DSO_strings(void);

 
 /* Error codes for the DSO functions. */
 
 /* Function codes. */
 #define DSO_F_DLFCN_BIND_FUNC                           100
 #define DSO_F_DLFCN_BIND_VAR                            101
 
 /* Error codes for the DSO functions. */
 
 /* Function codes. */
 #define DSO_F_DLFCN_BIND_FUNC                           100
 #define DSO_F_DLFCN_BIND_VAR                            101

-#define DSO_F_DLFCN_CTRL                                102
-#define DSO_F_DLFCN_LOAD                                103
-#define DSO_F_DLFCN_UNLOAD                              104
-#define DSO_F_DL_BIND_FUNC                              105
-#define DSO_F_DL_BIND_VAR                               106
-#define DSO_F_DL_CTRL                                   107
-#define DSO_F_DL_LOAD                                   108
-#define DSO_F_DL_UNLOAD                                         109
-#define DSO_F_DSO_BIND_FUNC                             110
-#define DSO_F_DSO_BIND_VAR                              111
-#define DSO_F_DSO_CTRL                                  112
-#define DSO_F_DSO_FREE                                  113
-#define DSO_F_DSO_LOAD                                  114
-#define DSO_F_DSO_NEW_METHOD                            115
-#define DSO_F_DSO_UP                                    116
-#define DSO_F_VMS_BIND_VAR                              122
-#define DSO_F_VMS_CTRL                                  123
-#define DSO_F_VMS_LOAD                                  124
-#define DSO_F_VMS_UNLOAD                                125
-#define DSO_F_WIN32_BIND_FUNC                           117
-#define DSO_F_WIN32_BIND_VAR                            118
-#define DSO_F_WIN32_CTRL                                119
+#define DSO_F_DLFCN_LOAD                                102
+#define DSO_F_DLFCN_NAME_CONVERTER                      123
+#define DSO_F_DLFCN_UNLOAD                              103
+#define DSO_F_DL_BIND_FUNC                              104
+#define DSO_F_DL_BIND_VAR                               105
+#define DSO_F_DL_LOAD                                   106
+#define DSO_F_DL_NAME_CONVERTER                                 124
+#define DSO_F_DL_UNLOAD                                         107
+#define DSO_F_DSO_BIND_FUNC                             108
+#define DSO_F_DSO_BIND_VAR                              109
+#define DSO_F_DSO_CONVERT_FILENAME                      126
+#define DSO_F_DSO_CTRL                                  110
+#define DSO_F_DSO_FREE                                  111
+#define DSO_F_DSO_GET_FILENAME                          127
+#define DSO_F_DSO_GET_LOADED_FILENAME                   128
+#define DSO_F_DSO_LOAD                                  112
+#define DSO_F_DSO_NEW_METHOD                            113
+#define DSO_F_DSO_SET_FILENAME                          129
+#define DSO_F_DSO_SET_NAME_CONVERTER                    122
+#define DSO_F_DSO_UP_REF                                114
+#define DSO_F_VMS_BIND_VAR                              115
+#define DSO_F_VMS_LOAD                                  116
+#define DSO_F_VMS_UNLOAD                                117
+#define DSO_F_WIN32_BIND_FUNC                           118
+#define DSO_F_WIN32_BIND_VAR                            119

 #define DSO_F_WIN32_LOAD                                120
 #define DSO_F_WIN32_LOAD                                120

+#define DSO_F_WIN32_NAME_CONVERTER                      125

 #define DSO_F_WIN32_UNLOAD                              121
 
 /* Reason codes. */
 #define DSO_R_CTRL_FAILED                               100
 #define DSO_F_WIN32_UNLOAD                              121
 
 /* Reason codes. */
 #define DSO_R_CTRL_FAILED                               100

-#define DSO_R_FILENAME_TOO_BIG                          109
-#define DSO_R_FINISH_FAILED                             101
-#define DSO_R_LOAD_FAILED                               102
-#define DSO_R_NULL_HANDLE                               103
-#define DSO_R_STACK_ERROR                               104
-#define DSO_R_SYM_FAILURE                               105
-#define DSO_R_UNKNOWN_COMMAND                           106
+#define DSO_R_DSO_ALREADY_LOADED                        110
+#define DSO_R_FILENAME_TOO_BIG                          101
+#define DSO_R_FINISH_FAILED                             102
+#define DSO_R_LOAD_FAILED                               103
+#define DSO_R_NAME_TRANSLATION_FAILED                   109
+#define DSO_R_NO_FILENAME                               111
+#define DSO_R_NULL_HANDLE                               104
+#define DSO_R_SET_FILENAME_FAILED                       112
+#define DSO_R_STACK_ERROR                               105
+#define DSO_R_SYM_FAILURE                               106

 #define DSO_R_UNLOAD_FAILED                             107
 #define DSO_R_UNSUPPORTED                               108
 
 #define DSO_R_UNLOAD_FAILED                             107
 #define DSO_R_UNSUPPORTED                               108
 


@@ -247,4 +322,3 @@ void ERR_load_DSO_strings(void);
 }
 #endif
 #endif
 }
 #endif
 #endif

-