main/pbx: Move dialplan application management routines to pbx_app.c.

This is the sixth patch in a series meant to reduce the bulk of pbx.c.
This moves dialplan application management functions to their own source.

Change-Id: I444c10fb90a3cdf9f3047605d6a8aad49c22c44c

4 files changed, 523 insertions, 448 deletions

diff --git a/main/asterisk.c b/main/asterisk.c
index 86e224080..448d627df 100644
--- a/main/asterisk.c
+++ b/main/asterisk.c
@@ -4615,6 +4615,11 @@ static void asterisk_daemon(int isroot, const char *runuser, const char *rungrou
 		exit(1);
 	}
 
+	if (load_pbx_app()) {
+		printf("Failed: load_pbx_app\n%s", term_quit());
+		exit(1);
+	}
+
 	if (ast_local_init()) {
 		printf("Failed: ast_local_init\n%s", term_quit());
 		exit(1);
diff --git a/main/pbx.c b/main/pbx.c
index 8a7528315..3c9d04b12 100644
--- a/main/pbx.c
+++ b/main/pbx.c
@@ -322,24 +322,6 @@ struct ast_context {
 	char name[0];				/*!< Name of the context */
 };
 
-/*! \brief ast_app: A registered application */
-struct ast_app {
-	int (*execute)(struct ast_channel *chan, const char *data);
-	AST_DECLARE_STRING_FIELDS(
-		AST_STRING_FIELD(synopsis);     /*!< Synopsis text for 'show applications' */
-		AST_STRING_FIELD(description);  /*!< Description (help text) for 'show application &lt;name&gt;' */
-		AST_STRING_FIELD(syntax);       /*!< Syntax text for 'core show applications' */
-		AST_STRING_FIELD(arguments);    /*!< Arguments description */
-		AST_STRING_FIELD(seealso);      /*!< See also */
-	);
-#ifdef AST_XML_DOCS
-	enum ast_doc_src docsrc;		/*!< Where the documentation come from. */
-#endif
-	AST_RWLIST_ENTRY(ast_app) list;		/*!< Next app in list */
-	struct ast_module *module;		/*!< Module this app belongs to */
-	char name[0];				/*!< Name of the application */
-};
-
 /*! \brief ast_state_cb: An extension state notify register item */
 struct ast_state_cb {
 	/*! Watcher ID returned when registered. */
@@ -760,13 +742,6 @@ AST_MUTEX_DEFINE_STATIC(conlock);
  */
 AST_MUTEX_DEFINE_STATIC(context_merge_lock);
 
-/*!
- * \brief Registered applications container.
- *
- * It is sorted by application name.
- */
-static AST_RWLIST_HEAD_STATIC(apps, ast_app);
-
 static int stateid = 1;
 /*!
  * \note When holding this container's lock, do _not_ do
@@ -956,72 +931,6 @@ int check_contexts(char *file, int line )
 }
 #endif
 
-/*
-   \note This function is special. It saves the stack so that no matter
-   how many times it is called, it returns to the same place */
-int pbx_exec(struct ast_channel *c,	/*!< Channel */
-	     struct ast_app *app,	/*!< Application */
-	     const char *data)		/*!< Data for execution */
-{
-	int res;
-	struct ast_module_user *u = NULL;
-	const char *saved_c_appl;
-	const char *saved_c_data;
-
-	/* save channel values */
-	saved_c_appl= ast_channel_appl(c);
-	saved_c_data= ast_channel_data(c);
-
-	ast_channel_lock(c);
-	ast_channel_appl_set(c, app->name);
-	ast_channel_data_set(c, data);
-	ast_channel_publish_snapshot(c);
-	ast_channel_unlock(c);
-
-	if (app->module)
-		u = __ast_module_user_add(app->module, c);
-	res = app->execute(c, S_OR(data, ""));
-	if (app->module && u)
-		__ast_module_user_remove(app->module, u);
-	/* restore channel values */
-	ast_channel_appl_set(c, saved_c_appl);
-	ast_channel_data_set(c, saved_c_data);
-	return res;
-}
-
-static struct ast_app *pbx_findapp_nolock(const char *name)
-{
-	struct ast_app *cur;
-	int cmp;
-
-	AST_RWLIST_TRAVERSE(&apps, cur, list) {
-		cmp = strcasecmp(name, cur->name);
-		if (cmp > 0) {
-			continue;
-		}
-		if (!cmp) {
-			/* Found it. */
-			break;
-		}
-		/* Not in container. */
-		cur = NULL;
-		break;
-	}
-
-	return cur;
-}
-
-struct ast_app *pbx_findapp(const char *app)
-{
-	struct ast_app *ret;
-
-	AST_RWLIST_RDLOCK(&apps);
-	ret = pbx_findapp_nolock(app);
-	AST_RWLIST_UNLOCK(&apps);
-
-	return ret;
-}
-
 static inline int include_valid(struct ast_include *i)
 {
 	if (!i->hastime)
@@ -2911,11 +2820,11 @@ static int pbx_extension_helper(struct ast_channel *c, struct ast_context *con,
 			if (substitute) {
 				pbx_substitute_variables_helper(c, substitute, passdata, sizeof(passdata)-1);
 			}
-			ast_debug(1, "Launching '%s'\n", app->name);
+			ast_debug(1, "Launching '%s'\n", app_name(app));
 			if (VERBOSITY_ATLEAST(3)) {
 				ast_verb(3, "Executing [%s@%s:%d] " COLORIZE_FMT "(\"" COLORIZE_FMT "\", \"" COLORIZE_FMT "\") %s\n",
 					exten, context, priority,
-					COLORIZE(COLOR_BRCYAN, 0, app->name),
+					COLORIZE(COLOR_BRCYAN, 0, app_name(app)),
 					COLORIZE(COLOR_BRMAGENTA, 0, ast_channel_name(c)),
 					COLORIZE(COLOR_BRMAGENTA, 0, passdata),
 					"in new stack");
@@ -5298,218 +5207,10 @@ int ast_context_unlockmacro(const char *context)
 	return ret;
 }
 
-/*! \brief Dynamically register a new dial plan application */
-int ast_register_application2(const char *app, int (*execute)(struct ast_channel *, const char *), const char *synopsis, const char *description, void *mod)
-{
-	struct ast_app *tmp;
-	struct ast_app *cur;
-	int length;
-#ifdef AST_XML_DOCS
-	char *tmpxml;
-#endif
-
-	AST_RWLIST_WRLOCK(&apps);
-	cur = pbx_findapp_nolock(app);
-	if (cur) {
-		ast_log(LOG_WARNING, "Already have an application '%s'\n", app);
-		AST_RWLIST_UNLOCK(&apps);
-		return -1;
-	}
-
-	length = sizeof(*tmp) + strlen(app) + 1;
-
-	if (!(tmp = ast_calloc(1, length))) {
-		AST_RWLIST_UNLOCK(&apps);
-		return -1;
-	}
-
-	if (ast_string_field_init(tmp, 128)) {
-		AST_RWLIST_UNLOCK(&apps);
-		ast_free(tmp);
-		return -1;
-	}
-
-	strcpy(tmp->name, app);
-	tmp->execute = execute;
-	tmp->module = mod;
-
-#ifdef AST_XML_DOCS
-	/* Try to lookup the docs in our XML documentation database */
-	if (ast_strlen_zero(synopsis) && ast_strlen_zero(description)) {
-		/* load synopsis */
-		tmpxml = ast_xmldoc_build_synopsis("application", app, ast_module_name(tmp->module));
-		ast_string_field_set(tmp, synopsis, tmpxml);
-		ast_free(tmpxml);
-
-		/* load description */
-		tmpxml = ast_xmldoc_build_description("application", app, ast_module_name(tmp->module));
-		ast_string_field_set(tmp, description, tmpxml);
-		ast_free(tmpxml);
-
-		/* load syntax */
-		tmpxml = ast_xmldoc_build_syntax("application", app, ast_module_name(tmp->module));
-		ast_string_field_set(tmp, syntax, tmpxml);
-		ast_free(tmpxml);
-
-		/* load arguments */
-		tmpxml = ast_xmldoc_build_arguments("application", app, ast_module_name(tmp->module));
-		ast_string_field_set(tmp, arguments, tmpxml);
-		ast_free(tmpxml);
-
-		/* load seealso */
-		tmpxml = ast_xmldoc_build_seealso("application", app, ast_module_name(tmp->module));
-		ast_string_field_set(tmp, seealso, tmpxml);
-		ast_free(tmpxml);
-		tmp->docsrc = AST_XML_DOC;
-	} else {
-#endif
-		ast_string_field_set(tmp, synopsis, synopsis);
-		ast_string_field_set(tmp, description, description);
-#ifdef AST_XML_DOCS
-		tmp->docsrc = AST_STATIC_DOC;
-	}
-#endif
-
-	/* Store in alphabetical order */
-	AST_RWLIST_TRAVERSE_SAFE_BEGIN(&apps, cur, list) {
-		if (strcasecmp(tmp->name, cur->name) < 0) {
-			AST_RWLIST_INSERT_BEFORE_CURRENT(tmp, list);
-			break;
-		}
-	}
-	AST_RWLIST_TRAVERSE_SAFE_END;
-	if (!cur)
-		AST_RWLIST_INSERT_TAIL(&apps, tmp, list);
-
-	ast_verb(2, "Registered application '" COLORIZE_FMT "'\n", COLORIZE(COLOR_BRCYAN, 0, tmp->name));
-
-	AST_RWLIST_UNLOCK(&apps);
-
-	return 0;
-}
-
 /*
  * Help for CLI commands ...
  */
 
-static void print_app_docs(struct ast_app *aa, int fd)
-{
-#ifdef AST_XML_DOCS
-	char *synopsis = NULL, *description = NULL, *arguments = NULL, *seealso = NULL;
-	if (aa->docsrc == AST_XML_DOC) {
-		synopsis = ast_xmldoc_printable(S_OR(aa->synopsis, "Not available"), 1);
-		description = ast_xmldoc_printable(S_OR(aa->description, "Not available"), 1);
-		arguments = ast_xmldoc_printable(S_OR(aa->arguments, "Not available"), 1);
-		seealso = ast_xmldoc_printable(S_OR(aa->seealso, "Not available"), 1);
-		if (!synopsis || !description || !arguments || !seealso) {
-			goto free_docs;
-		}
-		ast_cli(fd, "\n"
-			"%s  -= Info about application '%s' =- %s\n\n"
-			COLORIZE_FMT "\n"
-			"%s\n\n"
-			COLORIZE_FMT "\n"
-			"%s\n\n"
-			COLORIZE_FMT "\n"
-			"%s%s%s\n\n"
-			COLORIZE_FMT "\n"
-			"%s\n\n"
-			COLORIZE_FMT "\n"
-			"%s\n",
-			ast_term_color(COLOR_MAGENTA, 0), aa->name, ast_term_reset(),
-			COLORIZE(COLOR_MAGENTA, 0, "[Synopsis]"), synopsis,
-			COLORIZE(COLOR_MAGENTA, 0, "[Description]"), description,
-			COLORIZE(COLOR_MAGENTA, 0, "[Syntax]"),
-				ast_term_color(COLOR_CYAN, 0), S_OR(aa->syntax, "Not available"), ast_term_reset(),
-			COLORIZE(COLOR_MAGENTA, 0, "[Arguments]"), arguments,
-			COLORIZE(COLOR_MAGENTA, 0, "[See Also]"), seealso);
-free_docs:
-		ast_free(synopsis);
-		ast_free(description);
-		ast_free(arguments);
-		ast_free(seealso);
-	} else
-#endif
-	{
-		ast_cli(fd, "\n"
-			"%s  -= Info about application '%s' =- %s\n\n"
-			COLORIZE_FMT "\n"
-			COLORIZE_FMT "\n\n"
-			COLORIZE_FMT "\n"
-			COLORIZE_FMT "\n\n"
-			COLORIZE_FMT "\n"
-			COLORIZE_FMT "\n\n"
-			COLORIZE_FMT "\n"
-			COLORIZE_FMT "\n\n"
-			COLORIZE_FMT "\n"
-			COLORIZE_FMT "\n",
-			ast_term_color(COLOR_MAGENTA, 0), aa->name, ast_term_reset(),
-			COLORIZE(COLOR_MAGENTA, 0, "[Synopsis]"),
-			COLORIZE(COLOR_CYAN, 0, S_OR(aa->synopsis, "Not available")),
-			COLORIZE(COLOR_MAGENTA, 0, "[Description]"),
-			COLORIZE(COLOR_CYAN, 0, S_OR(aa->description, "Not available")),
-			COLORIZE(COLOR_MAGENTA, 0, "[Syntax]"),
-			COLORIZE(COLOR_CYAN, 0, S_OR(aa->syntax, "Not available")),
-			COLORIZE(COLOR_MAGENTA, 0, "[Arguments]"),
-			COLORIZE(COLOR_CYAN, 0, S_OR(aa->arguments, "Not available")),
-			COLORIZE(COLOR_MAGENTA, 0, "[See Also]"),
-			COLORIZE(COLOR_CYAN, 0, S_OR(aa->seealso, "Not available")));
-	}
-}
-
-/*
- * \brief 'show application' CLI command implementation function...
- */
-static char *handle_show_application(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
-{
-	struct ast_app *aa;
-	int app, no_registered_app = 1;
-
-	switch (cmd) {
-	case CLI_INIT:
-		e->command = "core show application";
-		e->usage =
-			"Usage: core show application <application> [<application> [<application> [...]]]\n"
-			"       Describes a particular application.\n";
-		return NULL;
-	case CLI_GENERATE:
-		/*
-		 * There is a possibility to show informations about more than one
-		 * application at one time. You can type 'show application Dial Echo' and
-		 * you will see informations about these two applications ...
-		 */
-		return ast_complete_applications(a->line, a->word, a->n);
-	}
-
-	if (a->argc < 4) {
-		return CLI_SHOWUSAGE;
-	}
-
-	AST_RWLIST_RDLOCK(&apps);
-	AST_RWLIST_TRAVERSE(&apps, aa, list) {
-		/* Check for each app that was supplied as an argument */
-		for (app = 3; app < a->argc; app++) {
-			if (strcasecmp(aa->name, a->argv[app])) {
-				continue;
-			}
-
-			/* We found it! */
-			no_registered_app = 0;
-
-			print_app_docs(aa, a->fd);
-		}
-	}
-	AST_RWLIST_UNLOCK(&apps);
-
-	/* we found at least one app? no? */
-	if (no_registered_app) {
-		ast_cli(a->fd, "Your application(s) is (are) not registered\n");
-		return CLI_FAILURE;
-	}
-
-	return CLI_SUCCESS;
-}
-
 /*! \brief  handle_show_hints: CLI support for listing registered dial plan hints */
 static char *handle_show_hints(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
 {
@@ -5750,89 +5451,6 @@ static char *handle_eat_memory(struct ast_cli_entry *e, int cmd, struct ast_cli_
 }
 #endif
 
-static char *handle_show_applications(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
-{
-	struct ast_app *aa;
-	int like = 0, describing = 0;
-	int total_match = 0;    /* Number of matches in like clause */
-	int total_apps = 0;     /* Number of apps registered */
-	static const char * const choices[] = { "like", "describing", NULL };
-
-	switch (cmd) {
-	case CLI_INIT:
-		e->command = "core show applications [like|describing]";
-		e->usage =
-			"Usage: core show applications [{like|describing} <text>]\n"
-			"       List applications which are currently available.\n"
-			"       If 'like', <text> will be a substring of the app name\n"
-			"       If 'describing', <text> will be a substring of the description\n";
-		return NULL;
-	case CLI_GENERATE:
-		return (a->pos != 3) ? NULL : ast_cli_complete(a->word, choices, a->n);
-	}
-
-	AST_RWLIST_RDLOCK(&apps);
-
-	if (AST_RWLIST_EMPTY(&apps)) {
-		ast_cli(a->fd, "There are no registered applications\n");
-		AST_RWLIST_UNLOCK(&apps);
-		return CLI_SUCCESS;
-	}
-
-	/* core list applications like <keyword> */
-	if ((a->argc == 5) && (!strcmp(a->argv[3], "like"))) {
-		like = 1;
-	} else if ((a->argc > 4) && (!strcmp(a->argv[3], "describing"))) {
-		describing = 1;
-	}
-
-	/* core list applications describing <keyword1> [<keyword2>] [...] */
-	if ((!like) && (!describing)) {
-		ast_cli(a->fd, "    -= Registered Asterisk Applications =-\n");
-	} else {
-		ast_cli(a->fd, "    -= Matching Asterisk Applications =-\n");
-	}
-
-	AST_RWLIST_TRAVERSE(&apps, aa, list) {
-		int printapp = 0;
-		total_apps++;
-		if (like) {
-			if (strcasestr(aa->name, a->argv[4])) {
-				printapp = 1;
-				total_match++;
-			}
-		} else if (describing) {
-			if (aa->description) {
-				/* Match all words on command line */
-				int i;
-				printapp = 1;
-				for (i = 4; i < a->argc; i++) {
-					if (!strcasestr(aa->description, a->argv[i])) {
-						printapp = 0;
-					} else {
-						total_match++;
-					}
-				}
-			}
-		} else {
-			printapp = 1;
-		}
-
-		if (printapp) {
-			ast_cli(a->fd,"  %20s: %s\n", aa->name, aa->synopsis ? aa->synopsis : "<Synopsis not available>");
-		}
-	}
-	if ((!like) && (!describing)) {
-		ast_cli(a->fd, "    -= %d Applications Registered =-\n",total_apps);
-	} else {
-		ast_cli(a->fd, "    -= %d Applications Matching =-\n",total_match);
-	}
-
-	AST_RWLIST_UNLOCK(&apps);
-
-	return CLI_SUCCESS;
-}
-
 /*
  * 'show dialplan' CLI command implementation functions ...
  */
@@ -6516,7 +6134,6 @@ static struct ast_cli_entry pbx_cli[] = {
 #if 0
 	AST_CLI_DEFINE(handle_eat_memory, "Eats all available memory"),
 #endif
-	AST_CLI_DEFINE(handle_show_applications, "Shows registered dialplan applications"),
 	AST_CLI_DEFINE(handle_show_hints, "Show dialplan hints"),
 	AST_CLI_DEFINE(handle_show_hint, "Show dialplan hint"),
 #ifdef AST_DEVMODE
@@ -6524,14 +6141,13 @@ static struct ast_cli_entry pbx_cli[] = {
 #endif
 	AST_CLI_DEFINE(handle_show_hangup_all, "Show hangup handlers of all channels"),
 	AST_CLI_DEFINE(handle_show_hangup_channel, "Show hangup handlers of a specified channel"),
-	AST_CLI_DEFINE(handle_show_application, "Describe a specific dialplan application"),
 	AST_CLI_DEFINE(handle_show_dialplan, "Show dialplan"),
 	AST_CLI_DEFINE(handle_debug_dialplan, "Show fast extension pattern matching data structures"),
 	AST_CLI_DEFINE(handle_unset_extenpatternmatchnew, "Use the Old extension pattern matching algorithm."),
 	AST_CLI_DEFINE(handle_set_extenpatternmatchnew, "Use the New extension pattern matching algorithm."),
 };
 
-static void unreference_cached_app(struct ast_app *app)
+void unreference_cached_app(struct ast_app *app)
 {
 	struct ast_context *context = NULL;
 	struct ast_exten *eroot = NULL, *e = NULL;
@@ -6550,36 +6166,6 @@ static void unreference_cached_app(struct ast_app *app)
 	return;
 }
 
-int ast_unregister_application(const char *app)
-{
-	struct ast_app *cur;
-	int cmp;
-
-	AST_RWLIST_WRLOCK(&apps);
-	AST_RWLIST_TRAVERSE_SAFE_BEGIN(&apps, cur, list) {
-		cmp = strcasecmp(app, cur->name);
-		if (cmp > 0) {
-			continue;
-		}
-		if (!cmp) {
-			/* Found it. */
-			unreference_cached_app(cur);
-			AST_RWLIST_REMOVE_CURRENT(list);
-			ast_verb(2, "Unregistered application '%s'\n", cur->name);
-			ast_string_field_free_memory(cur);
-			ast_free(cur);
-			break;
-		}
-		/* Not in container. */
-		cur = NULL;
-		break;
-	}
-	AST_RWLIST_TRAVERSE_SAFE_END;
-	AST_RWLIST_UNLOCK(&apps);
-
-	return cur ? 0 : -1;
-}
-
 struct ast_context *ast_context_find_or_create(struct ast_context **extcontexts, struct ast_hashtab *exttable, const char *name, const char *registrar)
 {
 	struct ast_context *tmp, **local_contexts;
@@ -9179,37 +8765,6 @@ int ast_async_parseable_goto(struct ast_channel *chan, const char *goto_string)
 	return pbx_parseable_goto(chan, goto_string, 1);
 }
 
-char *ast_complete_applications(const char *line, const char *word, int state)
-{
-	struct ast_app *app;
-	int which = 0;
-	int cmp;
-	char *ret = NULL;
-	size_t wordlen = strlen(word);
-
-	AST_RWLIST_RDLOCK(&apps);
-	AST_RWLIST_TRAVERSE(&apps, app, list) {
-		cmp = strncasecmp(word, app->name, wordlen);
-		if (cmp > 0) {
-			continue;
-		}
-		if (!cmp) {
-			/* Found match. */
-			if (++which <= state) {
-				/* Not enough matches. */
-				continue;
-			}
-			ret = ast_strdup(app->name);
-			break;
-		}
-		/* Not in container. */
-		break;
-	}
-	AST_RWLIST_UNLOCK(&apps);
-
-	return ret;
-}
-
 static int hint_hash(const void *obj, const int flags)
 {
 	const struct ast_hint *hint = obj;
diff --git a/main/pbx_app.c b/main/pbx_app.c
new file mode 100644
index 000000000..b7e797d88
--- /dev/null
+++ b/main/pbx_app.c
@@ -0,0 +1,510 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2016, CFWare, LLC
+ *
+ * Corey Farrell <git@cfware.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief Custom function management routines.
+ *
+ * \author Corey Farrell <git@cfware.com>
+ */
+
+/*** MODULEINFO
+	<support_level>core</support_level>
+ ***/
+
+#include "asterisk.h"
+
+ASTERISK_REGISTER_FILE()
+
+#include "asterisk/_private.h"
+#include "asterisk/cli.h"
+#include "asterisk/linkedlists.h"
+#include "asterisk/module.h"
+#include "asterisk/pbx.h"
+#include "asterisk/stasis_channels.h"
+#include "asterisk/strings.h"
+#include "asterisk/term.h"
+#include "asterisk/utils.h"
+#include "asterisk/xmldoc.h"
+#include "pbx_private.h"
+
+/*! \brief ast_app: A registered application */
+struct ast_app {
+	int (*execute)(struct ast_channel *chan, const char *data);
+	AST_DECLARE_STRING_FIELDS(
+		AST_STRING_FIELD(synopsis);     /*!< Synopsis text for 'show applications' */
+		AST_STRING_FIELD(description);  /*!< Description (help text) for 'show application &lt;name&gt;' */
+		AST_STRING_FIELD(syntax);       /*!< Syntax text for 'core show applications' */
+		AST_STRING_FIELD(arguments);    /*!< Arguments description */
+		AST_STRING_FIELD(seealso);      /*!< See also */
+	);
+#ifdef AST_XML_DOCS
+	enum ast_doc_src docsrc;		/*!< Where the documentation come from. */
+#endif
+	AST_RWLIST_ENTRY(ast_app) list;		/*!< Next app in list */
+	struct ast_module *module;		/*!< Module this app belongs to */
+	char name[0];				/*!< Name of the application */
+};
+
+/*!
+ * \brief Registered applications container.
+ *
+ * It is sorted by application name.
+ */
+static AST_RWLIST_HEAD_STATIC(apps, ast_app);
+
+static struct ast_app *pbx_findapp_nolock(const char *name)
+{
+	struct ast_app *cur;
+	int cmp;
+
+	AST_RWLIST_TRAVERSE(&apps, cur, list) {
+		cmp = strcasecmp(name, cur->name);
+		if (cmp > 0) {
+			continue;
+		}
+		if (!cmp) {
+			/* Found it. */
+			break;
+		}
+		/* Not in container. */
+		cur = NULL;
+		break;
+	}
+
+	return cur;
+}
+
+struct ast_app *pbx_findapp(const char *app)
+{
+	struct ast_app *ret;
+
+	AST_RWLIST_RDLOCK(&apps);
+	ret = pbx_findapp_nolock(app);
+	AST_RWLIST_UNLOCK(&apps);
+
+	return ret;
+}
+
+/*! \brief Dynamically register a new dial plan application */
+int ast_register_application2(const char *app, int (*execute)(struct ast_channel *, const char *), const char *synopsis, const char *description, void *mod)
+{
+	struct ast_app *tmp;
+	struct ast_app *cur;
+	int length;
+#ifdef AST_XML_DOCS
+	char *tmpxml;
+#endif
+
+	AST_RWLIST_WRLOCK(&apps);
+	cur = pbx_findapp_nolock(app);
+	if (cur) {
+		ast_log(LOG_WARNING, "Already have an application '%s'\n", app);
+		AST_RWLIST_UNLOCK(&apps);
+		return -1;
+	}
+
+	length = sizeof(*tmp) + strlen(app) + 1;
+
+	if (!(tmp = ast_calloc(1, length))) {
+		AST_RWLIST_UNLOCK(&apps);
+		return -1;
+	}
+
+	if (ast_string_field_init(tmp, 128)) {
+		AST_RWLIST_UNLOCK(&apps);
+		ast_free(tmp);
+		return -1;
+	}
+
+	strcpy(tmp->name, app);
+	tmp->execute = execute;
+	tmp->module = mod;
+
+#ifdef AST_XML_DOCS
+	/* Try to lookup the docs in our XML documentation database */
+	if (ast_strlen_zero(synopsis) && ast_strlen_zero(description)) {
+		/* load synopsis */
+		tmpxml = ast_xmldoc_build_synopsis("application", app, ast_module_name(tmp->module));
+		ast_string_field_set(tmp, synopsis, tmpxml);
+		ast_free(tmpxml);
+
+		/* load description */
+		tmpxml = ast_xmldoc_build_description("application", app, ast_module_name(tmp->module));
+		ast_string_field_set(tmp, description, tmpxml);
+		ast_free(tmpxml);
+
+		/* load syntax */
+		tmpxml = ast_xmldoc_build_syntax("application", app, ast_module_name(tmp->module));
+		ast_string_field_set(tmp, syntax, tmpxml);
+		ast_free(tmpxml);
+
+		/* load arguments */
+		tmpxml = ast_xmldoc_build_arguments("application", app, ast_module_name(tmp->module));
+		ast_string_field_set(tmp, arguments, tmpxml);
+		ast_free(tmpxml);
+
+		/* load seealso */
+		tmpxml = ast_xmldoc_build_seealso("application", app, ast_module_name(tmp->module));
+		ast_string_field_set(tmp, seealso, tmpxml);
+		ast_free(tmpxml);
+		tmp->docsrc = AST_XML_DOC;
+	} else {
+#endif
+		ast_string_field_set(tmp, synopsis, synopsis);
+		ast_string_field_set(tmp, description, description);
+#ifdef AST_XML_DOCS
+		tmp->docsrc = AST_STATIC_DOC;
+	}
+#endif
+
+	/* Store in alphabetical order */
+	AST_RWLIST_TRAVERSE_SAFE_BEGIN(&apps, cur, list) {
+		if (strcasecmp(tmp->name, cur->name) < 0) {
+			AST_RWLIST_INSERT_BEFORE_CURRENT(tmp, list);
+			break;
+		}
+	}
+	AST_RWLIST_TRAVERSE_SAFE_END;
+	if (!cur)
+		AST_RWLIST_INSERT_TAIL(&apps, tmp, list);
+
+	ast_verb(2, "Registered application '" COLORIZE_FMT "'\n", COLORIZE(COLOR_BRCYAN, 0, tmp->name));
+
+	AST_RWLIST_UNLOCK(&apps);
+
+	return 0;
+}
+
+static void print_app_docs(struct ast_app *aa, int fd)
+{
+#ifdef AST_XML_DOCS
+	char *synopsis = NULL, *description = NULL, *arguments = NULL, *seealso = NULL;
+	if (aa->docsrc == AST_XML_DOC) {
+		synopsis = ast_xmldoc_printable(S_OR(aa->synopsis, "Not available"), 1);
+		description = ast_xmldoc_printable(S_OR(aa->description, "Not available"), 1);
+		arguments = ast_xmldoc_printable(S_OR(aa->arguments, "Not available"), 1);
+		seealso = ast_xmldoc_printable(S_OR(aa->seealso, "Not available"), 1);
+		if (!synopsis || !description || !arguments || !seealso) {
+			goto free_docs;
+		}
+		ast_cli(fd, "\n"
+			"%s  -= Info about application '%s' =- %s\n\n"
+			COLORIZE_FMT "\n"
+			"%s\n\n"
+			COLORIZE_FMT "\n"
+			"%s\n\n"
+			COLORIZE_FMT "\n"
+			"%s%s%s\n\n"
+			COLORIZE_FMT "\n"
+			"%s\n\n"
+			COLORIZE_FMT "\n"
+			"%s\n",
+			ast_term_color(COLOR_MAGENTA, 0), aa->name, ast_term_reset(),
+			COLORIZE(COLOR_MAGENTA, 0, "[Synopsis]"), synopsis,
+			COLORIZE(COLOR_MAGENTA, 0, "[Description]"), description,
+			COLORIZE(COLOR_MAGENTA, 0, "[Syntax]"),
+				ast_term_color(COLOR_CYAN, 0), S_OR(aa->syntax, "Not available"), ast_term_reset(),
+			COLORIZE(COLOR_MAGENTA, 0, "[Arguments]"), arguments,
+			COLORIZE(COLOR_MAGENTA, 0, "[See Also]"), seealso);
+free_docs:
+		ast_free(synopsis);
+		ast_free(description);
+		ast_free(arguments);
+		ast_free(seealso);
+	} else
+#endif
+	{
+		ast_cli(fd, "\n"
+			"%s  -= Info about application '%s' =- %s\n\n"
+			COLORIZE_FMT "\n"
+			COLORIZE_FMT "\n\n"
+			COLORIZE_FMT "\n"
+			COLORIZE_FMT "\n\n"
+			COLORIZE_FMT "\n"
+			COLORIZE_FMT "\n\n"
+			COLORIZE_FMT "\n"
+			COLORIZE_FMT "\n\n"
+			COLORIZE_FMT "\n"
+			COLORIZE_FMT "\n",
+			ast_term_color(COLOR_MAGENTA, 0), aa->name, ast_term_reset(),
+			COLORIZE(COLOR_MAGENTA, 0, "[Synopsis]"),
+			COLORIZE(COLOR_CYAN, 0, S_OR(aa->synopsis, "Not available")),
+			COLORIZE(COLOR_MAGENTA, 0, "[Description]"),
+			COLORIZE(COLOR_CYAN, 0, S_OR(aa->description, "Not available")),
+			COLORIZE(COLOR_MAGENTA, 0, "[Syntax]"),
+			COLORIZE(COLOR_CYAN, 0, S_OR(aa->syntax, "Not available")),
+			COLORIZE(COLOR_MAGENTA, 0, "[Arguments]"),
+			COLORIZE(COLOR_CYAN, 0, S_OR(aa->arguments, "Not available")),
+			COLORIZE(COLOR_MAGENTA, 0, "[See Also]"),
+			COLORIZE(COLOR_CYAN, 0, S_OR(aa->seealso, "Not available")));
+	}
+}
+
+/*
+ * \brief 'show application' CLI command implementation function...
+ */
+static char *handle_show_application(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
+{
+	struct ast_app *aa;
+	int app, no_registered_app = 1;
+
+	switch (cmd) {
+	case CLI_INIT:
+		e->command = "core show application";
+		e->usage =
+			"Usage: core show application <application> [<application> [<application> [...]]]\n"
+			"       Describes a particular application.\n";
+		return NULL;
+	case CLI_GENERATE:
+		/*
+		 * There is a possibility to show informations about more than one
+		 * application at one time. You can type 'show application Dial Echo' and
+		 * you will see informations about these two applications ...
+		 */
+		return ast_complete_applications(a->line, a->word, a->n);
+	}
+
+	if (a->argc < 4) {
+		return CLI_SHOWUSAGE;
+	}
+
+	AST_RWLIST_RDLOCK(&apps);
+	AST_RWLIST_TRAVERSE(&apps, aa, list) {
+		/* Check for each app that was supplied as an argument */
+		for (app = 3; app < a->argc; app++) {
+			if (strcasecmp(aa->name, a->argv[app])) {
+				continue;
+			}
+
+			/* We found it! */
+			no_registered_app = 0;
+
+			print_app_docs(aa, a->fd);
+		}
+	}
+	AST_RWLIST_UNLOCK(&apps);
+
+	/* we found at least one app? no? */
+	if (no_registered_app) {
+		ast_cli(a->fd, "Your application(s) is (are) not registered\n");
+		return CLI_FAILURE;
+	}
+
+	return CLI_SUCCESS;
+}
+
+static char *handle_show_applications(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
+{
+	struct ast_app *aa;
+	int like = 0, describing = 0;
+	int total_match = 0;    /* Number of matches in like clause */
+	int total_apps = 0;     /* Number of apps registered */
+	static const char * const choices[] = { "like", "describing", NULL };
+
+	switch (cmd) {
+	case CLI_INIT:
+		e->command = "core show applications [like|describing]";
+		e->usage =
+			"Usage: core show applications [{like|describing} <text>]\n"
+			"       List applications which are currently available.\n"
+			"       If 'like', <text> will be a substring of the app name\n"
+			"       If 'describing', <text> will be a substring of the description\n";
+		return NULL;
+	case CLI_GENERATE:
+		return (a->pos != 3) ? NULL : ast_cli_complete(a->word, choices, a->n);
+	}
+
+	AST_RWLIST_RDLOCK(&apps);
+
+	if (AST_RWLIST_EMPTY(&apps)) {
+		ast_cli(a->fd, "There are no registered applications\n");
+		AST_RWLIST_UNLOCK(&apps);
+		return CLI_SUCCESS;
+	}
+
+	/* core list applications like <keyword> */
+	if ((a->argc == 5) && (!strcmp(a->argv[3], "like"))) {
+		like = 1;
+	} else if ((a->argc > 4) && (!strcmp(a->argv[3], "describing"))) {
+		describing = 1;
+	}
+
+	/* core list applications describing <keyword1> [<keyword2>] [...] */
+	if ((!like) && (!describing)) {
+		ast_cli(a->fd, "    -= Registered Asterisk Applications =-\n");
+	} else {
+		ast_cli(a->fd, "    -= Matching Asterisk Applications =-\n");
+	}
+
+	AST_RWLIST_TRAVERSE(&apps, aa, list) {
+		int printapp = 0;
+		total_apps++;
+		if (like) {
+			if (strcasestr(aa->name, a->argv[4])) {
+				printapp = 1;
+				total_match++;
+			}
+		} else if (describing) {
+			if (aa->description) {
+				/* Match all words on command line */
+				int i;
+				printapp = 1;
+				for (i = 4; i < a->argc; i++) {
+					if (!strcasestr(aa->description, a->argv[i])) {
+						printapp = 0;
+					} else {
+						total_match++;
+					}
+				}
+			}
+		} else {
+			printapp = 1;
+		}
+
+		if (printapp) {
+			ast_cli(a->fd,"  %20s: %s\n", aa->name, aa->synopsis ? aa->synopsis : "<Synopsis not available>");
+		}
+	}
+	if ((!like) && (!describing)) {
+		ast_cli(a->fd, "    -= %d Applications Registered =-\n",total_apps);
+	} else {
+		ast_cli(a->fd, "    -= %d Applications Matching =-\n",total_match);
+	}
+
+	AST_RWLIST_UNLOCK(&apps);
+
+	return CLI_SUCCESS;
+}
+
+int ast_unregister_application(const char *app)
+{
+	struct ast_app *cur;
+	int cmp;
+
+	AST_RWLIST_WRLOCK(&apps);
+	AST_RWLIST_TRAVERSE_SAFE_BEGIN(&apps, cur, list) {
+		cmp = strcasecmp(app, cur->name);
+		if (cmp > 0) {
+			continue;
+		}
+		if (!cmp) {
+			/* Found it. */
+			unreference_cached_app(cur);
+			AST_RWLIST_REMOVE_CURRENT(list);
+			ast_verb(2, "Unregistered application '%s'\n", cur->name);
+			ast_string_field_free_memory(cur);
+			ast_free(cur);
+			break;
+		}
+		/* Not in container. */
+		cur = NULL;
+		break;
+	}
+	AST_RWLIST_TRAVERSE_SAFE_END;
+	AST_RWLIST_UNLOCK(&apps);
+
+	return cur ? 0 : -1;
+}
+
+char *ast_complete_applications(const char *line, const char *word, int state)
+{
+	struct ast_app *app;
+	int which = 0;
+	int cmp;
+	char *ret = NULL;
+	size_t wordlen = strlen(word);
+
+	AST_RWLIST_RDLOCK(&apps);
+	AST_RWLIST_TRAVERSE(&apps, app, list) {
+		cmp = strncasecmp(word, app->name, wordlen);
+		if (cmp > 0) {
+			continue;
+		}
+		if (!cmp) {
+			/* Found match. */
+			if (++which <= state) {
+				/* Not enough matches. */
+				continue;
+			}
+			ret = ast_strdup(app->name);
+			break;
+		}
+		/* Not in container. */
+		break;
+	}
+	AST_RWLIST_UNLOCK(&apps);
+
+	return ret;
+}
+
+const char *app_name(struct ast_app *app)
+{
+	return app->name;
+}
+
+/*
+   \note This function is special. It saves the stack so that no matter
+   how many times it is called, it returns to the same place */
+int pbx_exec(struct ast_channel *c,	/*!< Channel */
+	     struct ast_app *app,	/*!< Application */
+	     const char *data)		/*!< Data for execution */
+{
+	int res;
+	struct ast_module_user *u = NULL;
+	const char *saved_c_appl;
+	const char *saved_c_data;
+
+	/* save channel values */
+	saved_c_appl= ast_channel_appl(c);
+	saved_c_data= ast_channel_data(c);
+
+	ast_channel_lock(c);
+	ast_channel_appl_set(c, app->name);
+	ast_channel_data_set(c, data);
+	ast_channel_publish_snapshot(c);
+	ast_channel_unlock(c);
+
+	if (app->module)
+		u = __ast_module_user_add(app->module, c);
+	res = app->execute(c, S_OR(data, ""));
+	if (app->module && u)
+		__ast_module_user_remove(app->module, u);
+	/* restore channel values */
+	ast_channel_appl_set(c, saved_c_appl);
+	ast_channel_data_set(c, saved_c_data);
+	return res;
+}
+
+static struct ast_cli_entry app_cli[] = {
+	AST_CLI_DEFINE(handle_show_applications, "Shows registered dialplan applications"),
+	AST_CLI_DEFINE(handle_show_application, "Describe a specific dialplan application"),
+};
+
+static void unload_pbx_app(void)
+{
+	ast_cli_unregister_multiple(app_cli, ARRAY_LEN(app_cli));
+}
+
+int load_pbx_app(void)
+{
+	ast_cli_register_multiple(app_cli, ARRAY_LEN(app_cli));
+	ast_register_cleanup(unload_pbx_app);
+
+	return 0;
+}
diff --git a/main/pbx_private.h b/main/pbx_private.h
index 87abefafa..e09194188 100644
--- a/main/pbx_private.h
+++ b/main/pbx_private.h
@@ -28,6 +28,9 @@ int raise_exception(struct ast_channel *chan, const char *reason, int priority);
 void wait_for_hangup(struct ast_channel *chan, const void *data);
 void set_ext_pri(struct ast_channel *c, const char *exten, int pri);
 
+/*! pbx.c function needed by pbx_app.c */
+void unreference_cached_app(struct ast_app *app);
+
 /*! pbx_builtins.c functions needed by pbx.c */
 int indicate_congestion(struct ast_channel *, const char *);
 int indicate_busy(struct ast_channel *, const char *);
@@ -35,6 +38,8 @@ int indicate_busy(struct ast_channel *, const char *);
 /*! pbx_switch.c functions needed by pbx.c */
 struct ast_switch *pbx_findswitch(const char *sw);
 
+/*! pbx_app.c functions needed by pbx.c */
+const char *app_name(struct ast_app *app);
 
 #define VAR_BUF_SIZE 4096