git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@77808 65c4cc65-6c06-0410-ace0-fbb531ad65f3
426 lines
12 KiB
C
426 lines
12 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (c) 2004-2006 Tilghman Lesher <app_stack_v003@the-tilghman.com>.
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*
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* This code is released by the author with no restrictions on usage.
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Stack applications Gosub, Return, etc.
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*
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* \author Tilghman Lesher <app_stack_v003@the-tilghman.com>
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*
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* \ingroup applications
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*/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include "asterisk/options.h"
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#include "asterisk/logger.h"
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#include "asterisk/channel.h"
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#include "asterisk/chanvars.h"
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#include "asterisk/pbx.h"
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#include "asterisk/module.h"
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#include "asterisk/config.h"
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#include "asterisk/app.h"
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#include "asterisk/manager.h"
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static const char *app_gosub = "Gosub";
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static const char *app_gosubif = "GosubIf";
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static const char *app_return = "Return";
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static const char *app_pop = "StackPop";
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static const char *gosub_synopsis = "Jump to label, saving return address";
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static const char *gosubif_synopsis = "Conditionally jump to label, saving return address";
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static const char *return_synopsis = "Return from gosub routine";
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static const char *pop_synopsis = "Remove one address from gosub stack";
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static const char *gosub_descrip =
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"Gosub([[context,]exten,]priority[(arg1[,...][,argN])])\n"
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" Jumps to the label specified, saving the return address.\n";
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static const char *gosubif_descrip =
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"GosubIf(condition?labeliftrue[(arg1[,...])][:labeliffalse[(arg1[,...])]])\n"
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" If the condition is true, then jump to labeliftrue. If false, jumps to\n"
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"labeliffalse, if specified. In either case, a jump saves the return point\n"
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"in the dialplan, to be returned to with a Return.\n";
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static const char *return_descrip =
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"Return([return-value])\n"
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" Jumps to the last label on the stack, removing it. The return value, if\n"
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"any, is saved in the channel variable GOSUB_RETVAL.\n";
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static const char *pop_descrip =
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"StackPop()\n"
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" Removes last label on the stack, discarding it.\n";
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static void gosub_free(void *data);
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static struct ast_datastore_info stack_info = {
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.type = "GOSUB",
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.destroy = gosub_free,
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};
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struct gosub_stack_frame {
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AST_LIST_ENTRY(gosub_stack_frame) entries;
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/* 100 arguments is all that we support anyway, but this will handle up to 255 */
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unsigned char arguments;
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struct varshead varshead;
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int priority;
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char *context;
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char extension[0];
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};
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static int frame_set_var(struct ast_channel *chan, struct gosub_stack_frame *frame, const char *var, const char *value)
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{
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struct ast_var_t *variables;
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int found = 0;
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/* Does this variable already exist? */
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AST_LIST_TRAVERSE(&frame->varshead, variables, entries) {
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if (!strcmp(var, ast_var_name(variables))) {
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found = 1;
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break;
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}
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}
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if (!ast_strlen_zero(value)) {
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if (!found) {
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variables = ast_var_assign(var, "");
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AST_LIST_INSERT_HEAD(&frame->varshead, variables, entries);
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pbx_builtin_pushvar_helper(chan, var, value);
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} else
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pbx_builtin_setvar_helper(chan, var, value);
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manager_event(EVENT_FLAG_CALL, "VarSet",
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"Channel: %s\r\n"
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"Variable: LOCAL(%s)\r\n"
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"Value: %s\r\n"
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"Uniqueid: %s\r\n",
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chan->name, var, value, chan->uniqueid);
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}
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return 0;
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}
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static void gosub_release_frame(struct ast_channel *chan, struct gosub_stack_frame *frame)
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{
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unsigned char i;
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char argname[15];
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struct ast_var_t *vardata;
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/* If chan is not defined, then we're calling it as part of gosub_free,
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* and the channel variables will be deallocated anyway. Otherwise, we're
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* just releasing a single frame, so we need to clean up the arguments for
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* that frame, so that we re-expose the variables from the previous frame
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* that were hidden by this one.
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*/
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if (chan) {
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for (i = 1; i <= frame->arguments && i != 0; i++) {
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snprintf(argname, sizeof(argname), "ARG%hhd", i);
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pbx_builtin_setvar_helper(chan, argname, NULL);
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}
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}
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/* Delete local variables */
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while ((vardata = AST_LIST_REMOVE_HEAD(&frame->varshead, entries))) {
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if (chan)
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pbx_builtin_setvar_helper(chan, ast_var_name(vardata), NULL);
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ast_var_delete(vardata);
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}
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ast_free(frame);
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}
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static struct gosub_stack_frame *gosub_allocate_frame(const char *context, const char *extension, int priority, unsigned char arguments)
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{
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struct gosub_stack_frame *new = NULL;
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int len_extension = strlen(extension), len_context = strlen(context);
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if ((new = ast_calloc(1, sizeof(*new) + 2 + len_extension + len_context))) {
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AST_LIST_HEAD_INIT_NOLOCK(&new->varshead);
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strcpy(new->extension, extension);
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new->context = new->extension + len_extension + 1;
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strcpy(new->context, context);
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new->priority = priority;
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new->arguments = arguments;
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}
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return new;
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}
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static void gosub_free(void *data)
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{
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AST_LIST_HEAD(, gosub_stack_frame) *oldlist = data;
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struct gosub_stack_frame *oldframe;
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AST_LIST_LOCK(oldlist);
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while ((oldframe = AST_LIST_REMOVE_HEAD(oldlist, entries))) {
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gosub_release_frame(NULL, oldframe);
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}
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AST_LIST_UNLOCK(oldlist);
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AST_LIST_HEAD_DESTROY(oldlist);
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ast_free(oldlist);
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}
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static int pop_exec(struct ast_channel *chan, void *data)
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{
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struct ast_datastore *stack_store = ast_channel_datastore_find(chan, &stack_info, NULL);
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struct gosub_stack_frame *oldframe;
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AST_LIST_HEAD(, gosub_stack_frame) *oldlist;
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if (!stack_store) {
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ast_log(LOG_WARNING, "%s called with no gosub stack allocated.\n", app_pop);
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return 0;
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}
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oldlist = stack_store->data;
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AST_LIST_LOCK(oldlist);
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oldframe = AST_LIST_REMOVE_HEAD(oldlist, entries);
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AST_LIST_UNLOCK(oldlist);
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if (oldframe) {
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gosub_release_frame(chan, oldframe);
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} else {
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ast_debug(1, "%s called with an empty gosub stack\n", app_pop);
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}
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return 0;
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}
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static int return_exec(struct ast_channel *chan, void *data)
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{
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struct ast_datastore *stack_store = ast_channel_datastore_find(chan, &stack_info, NULL);
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struct gosub_stack_frame *oldframe;
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AST_LIST_HEAD(, gosub_stack_frame) *oldlist;
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char *retval = data;
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if (!stack_store) {
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ast_log(LOG_ERROR, "Return without Gosub: stack is unallocated\n");
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return -1;
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}
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oldlist = stack_store->data;
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AST_LIST_LOCK(oldlist);
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oldframe = AST_LIST_REMOVE_HEAD(oldlist, entries);
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AST_LIST_UNLOCK(oldlist);
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if (!oldframe) {
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ast_log(LOG_ERROR, "Return without Gosub: stack is empty\n");
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return -1;
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}
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ast_explicit_goto(chan, oldframe->context, oldframe->extension, oldframe->priority);
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gosub_release_frame(chan, oldframe);
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/* Set a return value, if any */
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pbx_builtin_setvar_helper(chan, "GOSUB_RETVAL", S_OR(retval, ""));
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return 0;
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}
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static int gosub_exec(struct ast_channel *chan, void *data)
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{
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struct ast_datastore *stack_store = ast_channel_datastore_find(chan, &stack_info, NULL);
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AST_LIST_HEAD(, gosub_stack_frame) *oldlist;
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struct gosub_stack_frame *newframe;
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char argname[15], *tmp = ast_strdupa(data), *label, *endparen;
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int i;
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AST_DECLARE_APP_ARGS(args2,
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AST_APP_ARG(argval)[100];
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);
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if (ast_strlen_zero(data)) {
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ast_log(LOG_ERROR, "%s requires an argument: %s([[context|]exten|]priority[(arg1[|...][|argN])])\n", app_gosub, app_gosub);
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return -1;
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}
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if (!stack_store) {
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ast_debug(1, "Channel %s has no datastore, so we're allocating one.\n", chan->name);
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stack_store = ast_channel_datastore_alloc(&stack_info, NULL);
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if (!stack_store) {
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ast_log(LOG_ERROR, "Unable to allocate new datastore. Gosub will fail.\n");
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return -1;
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}
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oldlist = ast_calloc(1, sizeof(*oldlist));
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if (!oldlist) {
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ast_log(LOG_ERROR, "Unable to allocate datastore list head. Gosub will fail.\n");
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ast_channel_datastore_free(stack_store);
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return -1;
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}
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stack_store->data = oldlist;
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AST_LIST_HEAD_INIT(oldlist);
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ast_channel_datastore_add(chan, stack_store);
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}
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/* Separate the arguments from the label */
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/* NOTE: you cannot use ast_app_separate_args for this, because '(' cannot be used as a delimiter. */
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label = strsep(&tmp, "(");
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if (tmp) {
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endparen = strrchr(tmp, ')');
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if (endparen)
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*endparen = '\0';
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else
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ast_log(LOG_WARNING, "Ouch. No closing paren: '%s'?\n", (char *)data);
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AST_STANDARD_APP_ARGS(args2, tmp);
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} else
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args2.argc = 0;
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/* Create the return address, but don't save it until we know that the Gosub destination exists */
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newframe = gosub_allocate_frame(chan->context, chan->exten, chan->priority + 1, args2.argc);
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if (!newframe)
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return -1;
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if (ast_parseable_goto(chan, label)) {
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ast_log(LOG_ERROR, "Gosub address is invalid: '%s'\n", (char *)data);
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ast_free(newframe);
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return -1;
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}
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/* Now that we know for certain that we're going to a new location, set our arguments */
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for (i = 0; i < args2.argc; i++) {
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snprintf(argname, sizeof(argname), "ARG%d", i + 1);
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frame_set_var(chan, newframe, argname, args2.argval[i]);
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ast_debug(1, "Setting '%s' to '%s'\n", argname, args2.argval[i]);
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}
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/* And finally, save our return address */
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oldlist = stack_store->data;
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AST_LIST_LOCK(oldlist);
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AST_LIST_INSERT_HEAD(oldlist, newframe, entries);
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AST_LIST_UNLOCK(oldlist);
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return 0;
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}
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static int gosubif_exec(struct ast_channel *chan, void *data)
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{
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char *args;
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int res=0;
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AST_DECLARE_APP_ARGS(cond,
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AST_APP_ARG(ition);
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AST_APP_ARG(labels);
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);
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AST_DECLARE_APP_ARGS(label,
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AST_APP_ARG(iftrue);
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AST_APP_ARG(iffalse);
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);
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if (ast_strlen_zero(data)) {
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ast_log(LOG_WARNING, "GosubIf requires an argument: GosubIf(cond?label1(args):label2(args)\n");
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return 0;
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}
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args = ast_strdupa(data);
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AST_NONSTANDARD_APP_ARGS(cond, args, '?');
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if (cond.argc != 2) {
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ast_log(LOG_WARNING, "GosubIf requires an argument: GosubIf(cond?label1(args):label2(args)\n");
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return 0;
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}
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AST_NONSTANDARD_APP_ARGS(label, cond.labels, ':');
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if (pbx_checkcondition(cond.ition)) {
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if (!ast_strlen_zero(label.iftrue))
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res = gosub_exec(chan, label.iftrue);
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} else if (!ast_strlen_zero(label.iffalse)) {
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res = gosub_exec(chan, label.iffalse);
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}
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return res;
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}
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static int local_read(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
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{
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struct ast_datastore *stack_store = ast_channel_datastore_find(chan, &stack_info, NULL);
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AST_LIST_HEAD(, gosub_stack_frame) *oldlist;
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struct gosub_stack_frame *frame;
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struct ast_var_t *variables;
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if (!stack_store)
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return -1;
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oldlist = stack_store->data;
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AST_LIST_LOCK(oldlist);
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frame = AST_LIST_FIRST(oldlist);
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AST_LIST_TRAVERSE(&frame->varshead, variables, entries) {
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if (!strcmp(data, ast_var_name(variables))) {
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const char *tmp = pbx_builtin_getvar_helper(chan, data);
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ast_copy_string(buf, S_OR(tmp, ""), len);
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break;
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}
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}
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AST_LIST_UNLOCK(oldlist);
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return 0;
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}
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static int local_write(struct ast_channel *chan, const char *cmd, char *var, const char *value)
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{
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struct ast_datastore *stack_store = ast_channel_datastore_find(chan, &stack_info, NULL);
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AST_LIST_HEAD(, gosub_stack_frame) *oldlist;
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struct gosub_stack_frame *frame;
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if (!stack_store) {
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ast_log(LOG_ERROR, "Tried to set LOCAL(%s), but we aren't within a Gosub routine\n", var);
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return -1;
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}
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oldlist = stack_store->data;
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AST_LIST_LOCK(oldlist);
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frame = AST_LIST_FIRST(oldlist);
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if (frame)
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frame_set_var(chan, frame, var, value);
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AST_LIST_UNLOCK(oldlist);
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return 0;
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}
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static struct ast_custom_function local_function = {
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.name = "LOCAL",
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.synopsis = "Variables local to the gosub stack frame",
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.syntax = "LOCAL(<varname>)",
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.write = local_write,
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.read = local_read,
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};
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static int unload_module(void)
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{
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ast_unregister_application(app_return);
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ast_unregister_application(app_pop);
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ast_unregister_application(app_gosubif);
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ast_unregister_application(app_gosub);
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ast_custom_function_unregister(&local_function);
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return 0;
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}
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static int load_module(void)
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{
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ast_register_application(app_pop, pop_exec, pop_synopsis, pop_descrip);
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ast_register_application(app_return, return_exec, return_synopsis, return_descrip);
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ast_register_application(app_gosubif, gosubif_exec, gosubif_synopsis, gosubif_descrip);
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ast_register_application(app_gosub, gosub_exec, gosub_synopsis, gosub_descrip);
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ast_custom_function_register(&local_function);
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return 0;
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Dialplan subroutines (Gosub, Return, etc)");
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