CLI: Enable automatic references to modules.

* Pass module to ast_cli_register and ast_cli_register_multiple.
* Add a module reference before executing any CLI callback, remove
  the reference when complete.

ASTERISK-25049 #close
Reported by: Corey Farrell

Change-Id: I7aafc7c9f2b912918f28fe51d51e9e8a755750e3

include/asterisk/cli.h

@@ -177,7 +177,7 @@ struct ast_cli_entry {
 	const char * usage; 				/*!< Detailed usage information */
 
 	int inuse; 				/*!< For keeping track of usage */
-	struct module *module;			/*!< module this belongs to */
+	struct ast_module *module;			/*!< module this belongs to */
 	char *_full_cmd;			/*!< built at load time from cmda[] */
 	int cmdlen;				/*!< len up to the first invalid char [<{% */
 	/*! \brief This gets set in ast_cli_register()
@@ -253,14 +253,19 @@ int ast_cli_command_multiple_full(int uid, int gid, int fd, size_t size, const c
  * \retval 0 on success
  * \retval -1 on failure
  */
-int ast_cli_register(struct ast_cli_entry *e);
+#define ast_cli_register(e) __ast_cli_register(e, AST_MODULE_SELF)
+
+int __ast_cli_register(struct ast_cli_entry *e, struct ast_module *mod);
 
 /*!
  * \brief Register multiple commands
  * \param e pointer to first cli entry to register
  * \param len number of entries to register
  */
-int ast_cli_register_multiple(struct ast_cli_entry *e, int len);
+#define ast_cli_register_multiple(e, len) \
+	__ast_cli_register_multiple(e, len, AST_MODULE_SELF)
+
+int __ast_cli_register_multiple(struct ast_cli_entry *e, int len, struct ast_module *mod);
 
 /*! 
  * \brief Unregisters a command or an array of commands

main/cli.c

@@ -2203,7 +2203,7 @@ static int cli_is_registered(struct ast_cli_entry *e)
 	return 0;
 }
 
-static int __ast_cli_unregister(struct ast_cli_entry *e, struct ast_cli_entry *ed)
+int ast_cli_unregister(struct ast_cli_entry *e)
 {
 	if (e->inuse) {
 		ast_log(LOG_WARNING, "Can't remove command that is in use\n");
@@ -2225,7 +2225,7 @@ static int __ast_cli_unregister(struct ast_cli_entry *e, struct ast_cli_entry *e
 	return 0;
 }
 
-static int __ast_cli_register(struct ast_cli_entry *e, struct ast_cli_entry *ed)
+int __ast_cli_register(struct ast_cli_entry *e, struct ast_module *module)
 {
 	struct ast_cli_entry *cur;
 	int i, lf, ret = -1;
@@ -2244,7 +2244,11 @@ static int __ast_cli_register(struct ast_cli_entry *e, struct ast_cli_entry *ed)
 	}
 
 	memset(&a, '\0', sizeof(a));
+
+	e->module = module;
+	/* No module reference needed here, the module called us. */
 	e->handler(e, CLI_INIT, &a);
+
 	/* XXX check that usage and command are filled up */
 	s = ast_skip_blanks(e->command);
 	s = e->command = ast_strdup(s);
@@ -2295,27 +2299,16 @@ done:
 	return ret;
 }
 
-/* wrapper function, so we can unregister deprecated commands recursively */
-int ast_cli_unregister(struct ast_cli_entry *e)
-{
-	return __ast_cli_unregister(e, NULL);
-}
-
-/* wrapper function, so we can register deprecated commands recursively */
-int ast_cli_register(struct ast_cli_entry *e)
-{
-	return __ast_cli_register(e, NULL);
-}
-
 /*
  * register/unregister an array of entries.
  */
-int ast_cli_register_multiple(struct ast_cli_entry *e, int len)
+int __ast_cli_register_multiple(struct ast_cli_entry *e, int len, struct ast_module *module)
 {
 	int i, res = 0;
 
-	for (i = 0; i < len; i++)
+	for (i = 0; i < len; i++) {
-		res |= ast_cli_register(e + i);
+		res |= __ast_cli_register(e + i, module);
+	}
 
 	return res;
 }
@@ -2657,7 +2650,9 @@ static char *__ast_cli_generator(const char *text, const char *word, int state,
 					.n = state - matchnum,
 					.argv = argv,
 					.argc = x};
+				ast_module_ref(e->module);
 				ret = e->handler(e, CLI_GENERATE, &a);
+				ast_module_unref(e->module);
 			}
 			if (ret)
 				break;
@@ -2714,7 +2709,9 @@ int ast_cli_command_full(int uid, int gid, int fd, const char *s)
 	 */
 	args[0] = (char *)e;
 
+	ast_module_ref(e->module);
 	retval = e->handler(e, CLI_HANDLER, &a);
+	ast_module_unref(e->module);
 
 	if (retval == CLI_SHOWUSAGE) {
 		ast_cli(fd, "%s", S_OR(e->usage, "Invalid usage, but no usage information available.\n"));

res/res_clioriginate.c

@@ -156,8 +156,6 @@ static char *handle_orig(struct ast_cli_entry *e, int cmd, struct ast_cli_args *
 			"used. If no extension is given, the 's' extension will be used.\n";
 		return NULL;
 	case CLI_GENERATE:
-		/* ugly, can be removed when CLI entries have ast_module pointers */
-		ast_module_ref(ast_module_info->self);
 		if (a->pos == 3) {
 			res = ast_cli_complete(a->word, choices, a->n);
 		} else if (a->pos == 4) {
@@ -165,16 +163,12 @@ static char *handle_orig(struct ast_cli_entry *e, int cmd, struct ast_cli_args *
 				res = ast_complete_applications(a->line, a->word, a->n);
 			}
 		}
-		ast_module_unref(ast_module_info->self);
 		return res;
 	}
 
 	if (ast_strlen_zero(a->argv[2]) || ast_strlen_zero(a->argv[3]))
 		return CLI_SHOWUSAGE;
 
-	/* ugly, can be removed when CLI entries have ast_module pointers */
-	ast_module_ref(ast_module_info->self);
-
 	if (!strcasecmp("application", a->argv[3])) {
 		res = orig_app(a->fd, a->argv[2], a->argv[4], a->argv[5]);
 	} else if (!strcasecmp("extension", a->argv[3])) {
@@ -183,8 +177,6 @@ static char *handle_orig(struct ast_cli_entry *e, int cmd, struct ast_cli_args *
 		res = CLI_SHOWUSAGE;
 	}
 
-	ast_module_unref(ast_module_info->self);
-
 	return res;
 }
 

res/res_convert.c

@@ -88,9 +88,6 @@ static char *handle_cli_file_convert(struct ast_cli_entry *e, int cmd, struct as
 		return NULL;
 	}
 	
-	/* ugly, can be removed when CLI entries have ast_module pointers */
-	ast_module_ref(ast_module_info->self);
-
 	if (a->argc != 4 || ast_strlen_zero(a->argv[2]) || ast_strlen_zero(a->argv[3])) {
 		ret = CLI_SHOWUSAGE;
 		goto fail_out;	
@@ -142,8 +139,6 @@ fail_out:
 	if (fs_in) 
 		ast_closestream(fs_in);
 
-	ast_module_unref(ast_module_info->self);
-
 	return ret;
 }
 

utils/ael_main.c

@@ -103,7 +103,7 @@ static char var_dir[PATH_MAX];
 const char *ast_config_AST_CONFIG_DIR = config_dir;
 const char *ast_config_AST_VAR_DIR = var_dir;
 
-void ast_cli_register_multiple(void);
+void __ast_cli_register_multiple(void);
 int ast_add_extension2(struct ast_context *con,
 					   int replace, const char *extension, int priority, const char *label, const char *callerid,
 						const char *application, void *data, void (*datad)(void *),
@@ -208,7 +208,7 @@ void ast_module_unregister(const struct ast_module_info *x)
 }
 
 
-void ast_cli_register_multiple(void)
+void __ast_cli_register_multiple(void)
 {
 	if(!no_comp)
         	printf("Executed ast_cli_register_multiple();\n");

utils/clicompat.c

@@ -21,8 +21,8 @@ int ast_register_cleanup(void (*func)(void))
 	return 0;
 }
 
-int ast_cli_register_multiple(struct ast_cli_entry *e, int len);
+int __ast_cli_register_multiple(struct ast_cli_entry *e, int len);
-int ast_cli_register_multiple(struct ast_cli_entry *e, int len)
+int __ast_cli_register_multiple(struct ast_cli_entry *e, int len)
 {
 	return 0;
 }

utils/conf2ael.c

@@ -605,9 +605,9 @@ struct ast_context *ast_context_find_or_create(struct ast_context **extcontexts,
 	return localized_context_find_or_create(extcontexts, exttable, name, registrar);
 }
 
-void ast_cli_register_multiple(void);
+void __ast_cli_register_multiple(void);
 
-void ast_cli_register_multiple(void)
+void __ast_cli_register_multiple(void)
 {
 }