app_privacy.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <markster@digium.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 Block all calls without Caller*ID, require phone # to be entered
 *
 * \author Mark Spencer <markster@digium.com>
 *
 * \ingroup applications
 */
 
/*** MODULEINFO
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include "asterisk/lock.h"
#include "asterisk/file.h"
#include "asterisk/utils.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/translate.h"
#include "asterisk/callerid.h"
#include "asterisk/app.h"
#include "asterisk/config.h"
 
/*** DOCUMENTATION
    <application name="PrivacyManager" language="en_US">
        <synopsis>
            Require phone number to be entered, if no CallerID sent
        </synopsis>
        <syntax>
            <parameter name="maxretries">
                <para>Total tries caller is allowed to input a callerid. Defaults to <literal>3</literal>.</para>
            </parameter>
            <parameter name="minlength">
                <para>Minimum allowable digits in the input callerid number. Defaults to <literal>10</literal>.</para>
            </parameter>
            <parameter name="options">
                <para>Position reserved for options.</para>
            </parameter>
            <parameter name="context">
                <para>Context to check the given callerid against patterns.</para>
            </parameter>
        </syntax>
        <description>
            <para>If no Caller*ID is sent, PrivacyManager answers the channel and asks
            the caller to enter their phone number. The caller is given
            <replaceable>maxretries</replaceable> attempts to do so. The application does
            <emphasis>nothing</emphasis> if Caller*ID was received on the channel.</para>
            <para>The application sets the following channel variable upon completion:</para>
            <variablelist>
                <variable name="PRIVACYMGRSTATUS">
                    <para>The status of the privacy manager's attempt to collect a phone number from the user.</para>
                    <value name="SUCCESS"/>
                    <value name="FAILED"/>
                </variable>
            </variablelist>
        </description>
        <see-also>
            <ref type="application">Zapateller</ref>
        </see-also>
    </application>
 ***/
 
 
static char *app = "PrivacyManager";
 
static int privacy_exec(struct ast_channel *chan, const char *data)
{
    int res=0;
    int retries;
    int maxretries = 3;
    int minlength = 10;
    int x = 0;
    char phone[30];
    char *parse = NULL;
    AST_DECLARE_APP_ARGS(args,
        AST_APP_ARG(maxretries);
        AST_APP_ARG(minlength);
        AST_APP_ARG(options);
        AST_APP_ARG(checkcontext);
    );
 
    if (ast_channel_caller(chan)->id.number.valid
        && !ast_strlen_zero(ast_channel_caller(chan)->id.number.str)) {
        ast_verb(3, "CallerID number present: Skipping\n");
    } else {
        /*Answer the channel if it is not already*/
        if (ast_channel_state(chan) != AST_STATE_UP) {
            if ((res = ast_answer(chan))) {
                return -1;
            }
        }
 
        parse = ast_strdupa(data);
 
        AST_STANDARD_APP_ARGS(args, parse);
 
        if (!ast_strlen_zero(args.maxretries)) {
            if (sscanf(args.maxretries, "%30d", &x) == 1 && x > 0) {
                maxretries = x;
            } else {
                ast_log(LOG_WARNING, "Invalid max retries argument: '%s'\n", args.maxretries);
            }
        }
        if (!ast_strlen_zero(args.minlength)) {
            if (sscanf(args.minlength, "%30d", &x) == 1 && x > 0) {
                minlength = x;
            } else {
                ast_log(LOG_WARNING, "Invalid min length argument: '%s'\n", args.minlength);
            }
        }
 
        /* Play unidentified call */
        res = ast_safe_sleep(chan, 1000);
        if (!res) {
            res = ast_streamfile(chan, "privacy-unident", ast_channel_language(chan));
        }
        if (!res) {
            res = ast_waitstream(chan, "");
        }
 
        /* Ask for 10 digit number, give 3 attempts */
        for (retries = 0; retries < maxretries; retries++) {
            if (!res) {
                res = ast_streamfile(chan, "privacy-prompt", ast_channel_language(chan));
            }
            if (!res) {
                res = ast_waitstream(chan, "");
            }
 
            if (!res) {
                res = ast_readstring(chan, phone, sizeof(phone) - 1, /* digit timeout ms */ 3200, /* first digit timeout */ 5000, "#");
            }
 
            if (res < 0) {
                break;
            }
 
            /* Make sure we get at least digits */
            if (strlen(phone) >= minlength ) {
                /* if we have a checkcontext argument, do pattern matching */
                if (!ast_strlen_zero(args.checkcontext)) {
                    if (!ast_exists_extension(NULL, args.checkcontext, phone, 1, NULL)) {
                        res = ast_streamfile(chan, "privacy-incorrect", ast_channel_language(chan));
                        if (!res) {
                            res = ast_waitstream(chan, "");
                        }
                    } else {
                        break;
                    }
                } else {
                    break;
                }
            } else {
                res = ast_streamfile(chan, "privacy-incorrect", ast_channel_language(chan));
                if (!res) {
                    res = ast_waitstream(chan, "");
                }
            }
        }
 
        /* Got a number, play sounds and send them on their way */
        if ((retries < maxretries) && res >= 0) {
            res = ast_streamfile(chan, "privacy-thankyou", ast_channel_language(chan));
            if (!res) {
                res = ast_waitstream(chan, "");
            }
 
            /*
             * This is a caller entered number that is going to be used locally.
             * Therefore, the given number presentation is allowed and should
             * be passed out to other channels.  This is the point of the
             * privacy application.
             */
            ast_channel_caller(chan)->id.name.presentation = AST_PRES_ALLOWED_USER_NUMBER_NOT_SCREENED;
            ast_channel_caller(chan)->id.number.presentation = AST_PRES_ALLOWED_USER_NUMBER_NOT_SCREENED;
            ast_channel_caller(chan)->id.number.plan = 0;/* Unknown */
 
            ast_set_callerid(chan, phone, "Privacy Manager", NULL);
 
            ast_verb(3, "Changed Caller*ID number to '%s'\n", phone);
 
            pbx_builtin_setvar_helper(chan, "PRIVACYMGRSTATUS", "SUCCESS");
        } else {
            pbx_builtin_setvar_helper(chan, "PRIVACYMGRSTATUS", "FAILED");
        }
    }
 
    return 0;
}
 
static int unload_module(void)
{
    return ast_unregister_application(app);
}
 
static int load_module(void)
{
    return ast_register_application_xml(app, privacy_exec);
}
 
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Require phone number to be entered, if no CallerID sent");