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345 lines
8.8 KiB
345 lines
8.8 KiB
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2005, Digium, Inc.
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* Portions Copyright (C) 2005, Tilghman Lesher. All rights reserved.
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* Portions Copyright (C) 2005, Anthony Minessale II
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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 String manipulation dialplan functions
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*
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* \author Tilghman Lesher
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* \author Anothony Minessale II
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <regex.h>
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#include "asterisk.h"
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/* ASTERISK_FILE_VERSION(__FILE__, "$Revision$") */
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#include "asterisk/channel.h"
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#include "asterisk/pbx.h"
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#include "asterisk/logger.h"
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#include "asterisk/utils.h"
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#include "asterisk/app.h"
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#include "asterisk/localtime.h"
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static char *function_fieldqty(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
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{
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char *varval, workspace[4096];
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int fieldcount = 0;
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char *parse;
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AST_DECLARE_APP_ARGS(args,
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AST_APP_ARG(varname);
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AST_APP_ARG(delim);
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);
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parse = ast_strdupa(data);
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if (!parse) {
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ast_log(LOG_ERROR, "Out of memory\n");
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ast_copy_string(buf, "0", len);
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return buf;
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}
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AST_STANDARD_APP_ARGS(args, parse);
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if (args.delim) {
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pbx_retrieve_variable(chan, args.varname, &varval, workspace, sizeof(workspace), NULL);
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while (strsep(&varval, args.delim))
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fieldcount++;
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} else {
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fieldcount = 1;
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}
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snprintf(buf, len, "%d", fieldcount);
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return buf;
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}
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#ifndef BUILTIN_FUNC
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static
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#endif
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struct ast_custom_function fieldqty_function = {
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.name = "FIELDQTY",
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.synopsis = "Count the fields, with an arbitrary delimiter",
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.syntax = "FIELDQTY(<varname>,<delim>)",
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.read = function_fieldqty,
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};
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static char *builtin_function_filter(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
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{
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char *parse;
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AST_DECLARE_APP_ARGS(args,
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AST_APP_ARG(allowed);
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AST_APP_ARG(string);
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);
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char *outbuf=buf;
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parse = ast_strdupa(data);
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if (!parse) {
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ast_log(LOG_ERROR, "Out of memory");
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return "";
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}
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AST_STANDARD_APP_ARGS(args, parse);
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if (!args.string ) {
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ast_log(LOG_ERROR, "Usage: FILTER(<allowed-chars>,<string>)\n");
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return "";
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}
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for ( ; *(args.string) && (buf + len - 1 > outbuf); (args.string)++) {
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if (strchr(args.allowed, *(args.string))) {
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*outbuf = *(args.string);
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outbuf++;
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}
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}
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*outbuf = '\0';
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return buf;
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}
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#ifndef BUILTIN_FUNC
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static
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#endif
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struct ast_custom_function filter_function = {
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.name = "FILTER",
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.synopsis = "Filter the string to include only the allowed characters",
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.syntax = "FILTER(<allowed-chars>,<string>)",
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.read = builtin_function_filter,
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};
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static char *builtin_function_regex(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
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{
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char *parse;
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AST_DECLARE_APP_ARGS(args,
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AST_APP_ARG(null);
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AST_APP_ARG(reg);
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AST_APP_ARG(str);
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);
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char errstr[256] = "";
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int errcode;
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regex_t regexbuf;
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ast_copy_string(buf, "0", len);
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parse = ast_strdupa(data);
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if (!parse) {
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ast_log(LOG_ERROR, "Out of memory in %s(%s)\n", cmd, data);
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return buf;
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}
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AST_NONSTANDARD_APP_ARGS(args, parse, '"');
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ast_log(LOG_DEBUG, "FUNCTION REGEX (%s)(%s)\n", args.reg, args.str);
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if ((errcode = regcomp(®exbuf, args.reg, REG_EXTENDED | REG_NOSUB))) {
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regerror(errcode, ®exbuf, errstr, sizeof(errstr));
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ast_log(LOG_WARNING, "Malformed input %s(%s): %s\n", cmd, data, errstr);
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} else {
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if (!regexec(®exbuf, args.str, 0, NULL, 0))
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ast_copy_string(buf, "1", len);
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}
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regfree(®exbuf);
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return buf;
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}
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#ifndef BUILTIN_FUNC
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static
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#endif
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struct ast_custom_function regex_function = {
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.name = "REGEX",
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.synopsis = "Regular Expression: Returns 1 if data matches regular expression.",
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.syntax = "REGEX(\"<regular expression>\" <data>)",
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.read = builtin_function_regex,
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};
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static void builtin_function_array(struct ast_channel *chan, char *cmd, char *data, const char *value)
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{
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AST_DECLARE_APP_ARGS(arg1,
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AST_APP_ARG(var)[100];
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);
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AST_DECLARE_APP_ARGS(arg2,
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AST_APP_ARG(val)[100];
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);
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char *var, *value2;
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int i;
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var = ast_strdupa(data);
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value2 = ast_strdupa(value);
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if (!var || !value2) {
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ast_log(LOG_ERROR, "Out of memory\n");
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return;
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}
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/* The functions this will generally be used with are SORT and ODBC_*, which
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* both return comma-delimited lists. However, if somebody uses literal lists,
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* their commas will be translated to vertical bars by the load, and I don't
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* want them to be surprised by the result. Hence, we prefer commas as the
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* delimiter, but we'll fall back to vertical bars if commas aren't found.
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*/
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ast_log(LOG_DEBUG, "array (%s=%s)\n", var, value2);
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if (strchr(var, ',')) {
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AST_NONSTANDARD_APP_ARGS(arg1, var, ',');
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} else {
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AST_STANDARD_APP_ARGS(arg1, var);
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}
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if (strchr(value2, ',')) {
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AST_NONSTANDARD_APP_ARGS(arg2, value2, ',');
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} else {
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AST_STANDARD_APP_ARGS(arg2, value2);
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}
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for (i = 0; i < arg1.argc; i++) {
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ast_log(LOG_DEBUG, "array set value (%s=%s)\n", arg1.var[i], arg2.val[i]);
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if (i < arg2.argc) {
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pbx_builtin_setvar_helper(chan, arg1.var[i], arg2.val[i]);
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} else {
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/* We could unset the variable, by passing a NULL, but due to
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* pushvar semantics, that could create some undesired behavior. */
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pbx_builtin_setvar_helper(chan, arg1.var[i], "");
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}
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}
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}
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#ifndef BUILTIN_FUNC
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static
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#endif
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struct ast_custom_function array_function = {
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.name = "ARRAY",
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.synopsis = "Allows setting multiple variables at once",
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.syntax = "ARRAY(var1[,var2[...][,varN]])",
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.write = builtin_function_array,
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.desc =
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"The comma-separated list passed as a value to which the function is set will\n"
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"be interpreted as a set of values to which the comma-separated list of\n"
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"variable names in the argument should be set.\n"
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"Hence, Set(ARRAY(var1,var2)=1,2) will set var1 to 1 and var2 to 2\n"
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"Note: remember to either backslash your commas in extensions.conf or quote the\n"
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"entire argument, since Set can take multiple arguments itself.\n",
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};
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static char *builtin_function_len(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
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{
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int length = 0;
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if (data) {
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length = strlen(data);
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}
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snprintf(buf, len, "%d", length);
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return buf;
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}
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#ifndef BUILTIN_FUNC
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static
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#endif
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struct ast_custom_function len_function = {
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.name = "LEN",
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.synopsis = "Returns the length of the argument given",
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.syntax = "LEN(<string>)",
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.read = builtin_function_len,
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};
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static char *acf_strftime(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
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{
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char *parse;
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AST_DECLARE_APP_ARGS(args,
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AST_APP_ARG(epoch);
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AST_APP_ARG(timezone);
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AST_APP_ARG(format);
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);
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long epochi;
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struct tm time;
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buf[0] = '\0';
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if (ast_strlen_zero(data)) {
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ast_log(LOG_ERROR, "Asterisk function STRFTIME() requires an argument.\n");
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return buf;
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}
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parse = ast_strdupa(data);
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if (!parse) {
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ast_log(LOG_ERROR, "Out of memory\n");
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return buf;
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}
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AST_STANDARD_APP_ARGS(args, parse);
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if (ast_strlen_zero(args.epoch) || !sscanf(args.epoch, "%ld", &epochi)) {
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struct timeval tv = ast_tvnow();
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epochi = tv.tv_sec;
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}
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ast_localtime(&epochi, &time, args.timezone);
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if (!strftime(buf, len, args.format?args.format:"%c", &time)) {
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ast_log(LOG_WARNING, "C function strftime() output nothing?!!\n");
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}
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buf[len - 1] = '\0';
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return buf;
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}
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#ifndef BUILTIN_FUNC
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static
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#endif
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struct ast_custom_function strftime_function = {
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.name = "STRFTIME",
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.synopsis = "Returns the current date/time in a specified format.",
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.syntax = "STRFTIME([<epoch>][,[timezone][,format]])",
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.read = acf_strftime,
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};
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static char *function_eval(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
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{
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memset(buf, 0, len);
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if (ast_strlen_zero(data)) {
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ast_log(LOG_WARNING, "EVAL requires an argument: EVAL(<string>)\n");
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return buf;
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}
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pbx_substitute_variables_helper(chan, data, buf, len - 1);
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return buf;
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}
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#ifndef BUILTIN_FUNC
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static
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#endif
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struct ast_custom_function eval_function = {
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.name = "EVAL",
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.synopsis = "Evaluate stored variables.",
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.syntax = "EVAL(<variable>)",
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.desc = "Using EVAL basically causes a string to be evaluated twice.\n"
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"When a variable or expression is in the dialplan, it will be\n"
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"evaluated at runtime. However, if the result of the evaluation\n"
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"is in fact a variable or expression, using EVAL will have it\n"
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"evaluated a second time. For example, if the variable ${MYVAR}\n"
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"contains \"${OTHERVAR}\", then the result of putting ${EVAL(${MYVAR})}\n"
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"in the dialplan will be the contents of the variable, OTHERVAR.\n"
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"Normally, by just putting ${MYVAR} in the dialplan, you would be\n"
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"left with \"${OTHERVAR}\".\n",
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.read = function_eval,
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};
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