Wed Apr 6 11:29:38 2011

Asterisk developer's documentation


app_privacy.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2005, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  *
00021  * \brief Block all calls without Caller*ID, require phone # to be entered
00022  *
00023  * \author Mark Spencer <markster@digium.com>
00024  *
00025  * \ingroup applications
00026  */
00027 
00028 #include "asterisk.h"
00029 
00030 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 276347 $")
00031 
00032 #include "asterisk/lock.h"
00033 #include "asterisk/file.h"
00034 #include "asterisk/utils.h"
00035 #include "asterisk/channel.h"
00036 #include "asterisk/pbx.h"
00037 #include "asterisk/module.h"
00038 #include "asterisk/translate.h"
00039 #include "asterisk/image.h"
00040 #include "asterisk/callerid.h"
00041 #include "asterisk/app.h"
00042 #include "asterisk/config.h"
00043 
00044 /*** DOCUMENTATION
00045    <application name="PrivacyManager" language="en_US">
00046       <synopsis>
00047          Require phone number to be entered, if no CallerID sent
00048       </synopsis>
00049       <syntax>
00050          <parameter name="maxretries">
00051             <para>Total tries caller is allowed to input a callerid. Defaults to <literal>3</literal>.</para>
00052          </parameter>
00053          <parameter name="minlength">
00054             <para>Minimum allowable digits in the input callerid number. Defaults to <literal>10</literal>.</para>
00055          </parameter>
00056          <parameter name="context">
00057             <para>Context to check the given callerid against patterns.</para>
00058          </parameter>
00059       </syntax>
00060       <description>
00061          <para>If no Caller*ID is sent, PrivacyManager answers the channel and asks
00062          the caller to enter their phone number. The caller is given
00063          <replaceable>maxretries</replaceable> attempts to do so. The application does
00064          <emphasis>nothing</emphasis> if Caller*ID was received on the channel.</para>
00065          <para>The application sets the following channel variable upon completion:</para>
00066          <variablelist>
00067             <variable name="PRIVACYMGRSTATUS">
00068                <para>The status of the privacy manager's attempt to collect a phone number from the user.</para>
00069                <value name="SUCCESS"/>
00070                <value name="FAILED"/>
00071             </variable>
00072          </variablelist>
00073       </description>
00074       <see-also>
00075          <ref type="application">Zapateller</ref>
00076       </see-also>
00077    </application>
00078  ***/
00079 
00080 
00081 static char *app = "PrivacyManager";
00082 
00083 static int privacy_exec(struct ast_channel *chan, const char *data)
00084 {
00085    int res=0;
00086    int retries;
00087    int maxretries = 3;
00088    int minlength = 10;
00089    int x = 0;
00090    char phone[30];
00091    char *parse = NULL;
00092    AST_DECLARE_APP_ARGS(args,
00093       AST_APP_ARG(maxretries);
00094       AST_APP_ARG(minlength);
00095       AST_APP_ARG(options);
00096       AST_APP_ARG(checkcontext);
00097    );
00098 
00099    if (chan->caller.id.number.valid
00100       && !ast_strlen_zero(chan->caller.id.number.str)) {
00101       ast_verb(3, "CallerID number present: Skipping\n");
00102    } else {
00103       /*Answer the channel if it is not already*/
00104       if (chan->_state != AST_STATE_UP) {
00105          if ((res = ast_answer(chan))) {
00106             return -1;
00107          }
00108       }
00109 
00110       parse = ast_strdupa(S_OR(data, ""));
00111 
00112       AST_STANDARD_APP_ARGS(args, parse);
00113 
00114       if (!ast_strlen_zero(args.maxretries)) {
00115          if (sscanf(args.maxretries, "%30d", &x) == 1 && x > 0) {
00116             maxretries = x;
00117          } else {
00118             ast_log(LOG_WARNING, "Invalid max retries argument: '%s'\n", args.maxretries);
00119          }
00120       }
00121       if (!ast_strlen_zero(args.minlength)) {
00122          if (sscanf(args.minlength, "%30d", &x) == 1 && x > 0) {
00123             minlength = x;
00124          } else {
00125             ast_log(LOG_WARNING, "Invalid min length argument: '%s'\n", args.minlength);
00126          }
00127       }
00128 
00129       /* Play unidentified call */
00130       res = ast_safe_sleep(chan, 1000);
00131       if (!res) {
00132          res = ast_streamfile(chan, "privacy-unident", chan->language);
00133       }
00134       if (!res) {
00135          res = ast_waitstream(chan, "");
00136       }
00137 
00138       /* Ask for 10 digit number, give 3 attempts */
00139       for (retries = 0; retries < maxretries; retries++) {
00140          if (!res) {
00141             res = ast_streamfile(chan, "privacy-prompt", chan->language);
00142          }
00143          if (!res) {
00144             res = ast_waitstream(chan, "");
00145          }
00146 
00147          if (!res) {
00148             res = ast_readstring(chan, phone, sizeof(phone) - 1, /* digit timeout ms */ 3200, /* first digit timeout */ 5000, "#");
00149          }
00150 
00151          if (res < 0) {
00152             break;
00153          }
00154 
00155          /* Make sure we get at least digits */
00156          if (strlen(phone) >= minlength ) {
00157             /* if we have a checkcontext argument, do pattern matching */
00158             if (!ast_strlen_zero(args.checkcontext)) {
00159                if (!ast_exists_extension(NULL, args.checkcontext, phone, 1, NULL)) {
00160                   res = ast_streamfile(chan, "privacy-incorrect", chan->language);
00161                   if (!res) {
00162                      res = ast_waitstream(chan, "");
00163                   }
00164                } else {
00165                   break;
00166                }
00167             } else {
00168                break;
00169             }
00170          } else {
00171             res = ast_streamfile(chan, "privacy-incorrect", chan->language);
00172             if (!res) {
00173                res = ast_waitstream(chan, "");
00174             }
00175          }
00176       }
00177 
00178       /* Got a number, play sounds and send them on their way */
00179       if ((retries < maxretries) && res >= 0) {
00180          res = ast_streamfile(chan, "privacy-thankyou", chan->language);
00181          if (!res) {
00182             res = ast_waitstream(chan, "");
00183          }
00184 
00185          /*
00186           * This is a caller entered number that is going to be used locally.
00187           * Therefore, the given number presentation is allowed and should
00188           * be passed out to other channels.  This is the point of the
00189           * privacy application.
00190           */
00191          chan->caller.id.name.presentation = AST_PRES_ALLOWED_USER_NUMBER_NOT_SCREENED;
00192          chan->caller.id.number.presentation = AST_PRES_ALLOWED_USER_NUMBER_NOT_SCREENED;
00193          chan->caller.id.number.plan = 0;/* Unknown */
00194 
00195          ast_set_callerid(chan, phone, "Privacy Manager", NULL);
00196 
00197          ast_verb(3, "Changed Caller*ID number to '%s'\n", phone);
00198 
00199          pbx_builtin_setvar_helper(chan, "PRIVACYMGRSTATUS", "SUCCESS");
00200       } else {
00201          pbx_builtin_setvar_helper(chan, "PRIVACYMGRSTATUS", "FAILED");
00202       }
00203    }
00204 
00205    return 0;
00206 }
00207 
00208 static int unload_module(void)
00209 {
00210    return ast_unregister_application(app);
00211 }
00212 
00213 static int load_module(void)
00214 {
00215    return ast_register_application_xml(app, privacy_exec);
00216 }
00217 
00218 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Require phone number to be entered, if no CallerID sent");

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