git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6868 65c4cc65-6c06-0410-ace0-fbb531ad65f3
418 lines
12 KiB
C
Executable file
418 lines
12 KiB
C
Executable file
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Jim Dixon <jim@lambdatel.com>
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*
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* Made only slightly more sane by Mark Spencer <markster@digium.com>
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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 DISA -- Direct Inward System Access Application
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*
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#include <sys/time.h>
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/lock.h"
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#include "asterisk/file.h"
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#include "asterisk/logger.h"
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#include "asterisk/channel.h"
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#include "asterisk/app.h"
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#include "asterisk/indications.h"
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#include "asterisk/pbx.h"
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#include "asterisk/module.h"
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#include "asterisk/translate.h"
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#include "asterisk/ulaw.h"
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#include "asterisk/callerid.h"
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static char *tdesc = "DISA (Direct Inward System Access) Application";
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static char *app = "DISA";
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static char *synopsis = "DISA (Direct Inward System Access)";
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static char *descrip =
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"DISA(<numeric passcode>[|<context>]) or disa(<filename>)\n"
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"The DISA, Direct Inward System Access, application allows someone from \n"
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"outside the telephone switch (PBX) to obtain an \"internal\" system \n"
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"dialtone and to place calls from it as if they were placing a call from \n"
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"within the switch.\n"
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"DISA plays a dialtone. The user enters their numeric passcode, followed by\n"
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"the pound sign (#). If the passcode is correct, the user is then given\n"
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"system dialtone on which a call may be placed. Obviously, this type\n"
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"of access has SERIOUS security implications, and GREAT care must be\n"
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"taken NOT to compromise your security.\n\n"
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"There is a possibility of accessing DISA without password. Simply\n"
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"exchange your password with \"no-password\".\n\n"
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" Example: exten => s,1,DISA(no-password|local)\n\n"
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"Be aware that using this compromises the security of your PBX.\n\n"
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"The arguments to this application (in extensions.conf) allow either\n"
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"specification of a single global passcode (that everyone uses), or\n"
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"individual passcodes contained in a file. It also allow specification\n"
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"of the context on which the user will be dialing. If no context is\n"
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"specified, the DISA application defaults the context to \"disa\".\n"
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"Presumably a normal system will have a special context set up\n"
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"for DISA use with some or a lot of restrictions. \n\n"
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"The file that contains the passcodes (if used) allows specification\n"
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"of either just a passcode (defaulting to the \"disa\" context, or\n"
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"passcode|context on each line of the file. The file may contain blank\n"
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"lines, or comments starting with \"#\" or \";\". In addition, the\n"
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"above arguments may have |new-callerid-string appended to them, to\n"
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"specify a new (different) callerid to be used for this call, for\n"
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"example: numeric-passcode|context|\"My Phone\" <(234) 123-4567> or \n"
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"full-pathname-of-passcode-file|\"My Phone\" <(234) 123-4567>. Last\n"
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"but not least, |mailbox[@context] may be appended, which will cause\n"
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"a stutter-dialtone (indication \"dialrecall\") to be used, if the\n"
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"specified mailbox contains any new messages, for example:\n"
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"numeric-passcode|context||1234 (w/a changing callerid). Note that\n"
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"in the case of specifying the numeric-passcode, the context must be\n"
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"specified if the callerid is specified also.\n\n"
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"If login is successful, the application looks up the dialed number in\n"
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"the specified (or default) context, and executes it if found.\n"
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"If the user enters an invalid extension and extension \"i\" (invalid) \n"
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"exists in the context, it will be used.\n";
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STANDARD_LOCAL_USER;
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LOCAL_USER_DECL;
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static void play_dialtone(struct ast_channel *chan, char *mailbox)
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{
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const struct tone_zone_sound *ts = NULL;
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if(ast_app_has_voicemail(mailbox, NULL))
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ts = ast_get_indication_tone(chan->zone, "dialrecall");
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else
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ts = ast_get_indication_tone(chan->zone, "dial");
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if (ts)
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ast_playtones_start(chan, 0, ts->data, 0);
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else
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ast_tonepair_start(chan, 350, 440, 0, 0);
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}
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static int disa_exec(struct ast_channel *chan, void *data)
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{
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int i,j,k,x,did_ignore;
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int firstdigittimeout = 20000;
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int digittimeout = 10000;
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struct localuser *u;
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char *tmp, arg2[256]="",exten[AST_MAX_EXTENSION],acctcode[20]="";
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char *ourcontext,*ourcallerid,ourcidname[256],ourcidnum[256],*mailbox;
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struct ast_frame *f;
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struct timeval lastdigittime;
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int res;
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time_t rstart;
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FILE *fp;
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char *stringp=NULL;
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if (ast_strlen_zero(data)) {
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ast_log(LOG_WARNING, "disa requires an argument (passcode/passcode file)\n");
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return -1;
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}
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LOCAL_USER_ADD(u);
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if (chan->pbx) {
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firstdigittimeout = chan->pbx->rtimeout*1000;
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digittimeout = chan->pbx->dtimeout*1000;
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}
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if (ast_set_write_format(chan,AST_FORMAT_ULAW)) {
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ast_log(LOG_WARNING, "Unable to set write format to Mu-law on %s\n",chan->name);
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LOCAL_USER_REMOVE(u);
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return -1;
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}
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if (ast_set_read_format(chan,AST_FORMAT_ULAW)) {
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ast_log(LOG_WARNING, "Unable to set read format to Mu-law on %s\n",chan->name);
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LOCAL_USER_REMOVE(u);
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return -1;
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}
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ast_log(LOG_DEBUG, "Digittimeout: %d\n", digittimeout);
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ast_log(LOG_DEBUG, "Responsetimeout: %d\n", firstdigittimeout);
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tmp = ast_strdupa(data);
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if (!tmp) {
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ast_log(LOG_ERROR, "Out of memory\n");
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LOCAL_USER_REMOVE(u);
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return -1;
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}
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stringp=tmp;
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strsep(&stringp, "|");
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ourcontext = strsep(&stringp, "|");
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/* if context specified, save 2nd arg and parse third */
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if (ourcontext) {
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ast_copy_string(arg2, ourcontext, sizeof(arg2));
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ourcallerid = strsep(&stringp,"|");
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}
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/* if context not specified, use "disa" */
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else {
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arg2[0] = 0;
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ourcallerid = NULL;
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ourcontext = "disa";
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}
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mailbox = strsep(&stringp, "|");
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if (!mailbox)
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mailbox = "";
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ast_log(LOG_DEBUG, "Mailbox: %s\n",mailbox);
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if (chan->_state != AST_STATE_UP) {
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/* answer */
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ast_answer(chan);
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}
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i = k = x = 0; /* k is 0 for pswd entry, 1 for ext entry */
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did_ignore = 0;
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exten[0] = 0;
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acctcode[0] = 0;
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/* can we access DISA without password? */
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ast_log(LOG_DEBUG, "Context: %s\n",ourcontext);
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if (!strcasecmp(tmp, "no-password")) {
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k |= 1; /* We have the password */
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ast_log(LOG_DEBUG, "DISA no-password login success\n");
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}
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lastdigittime = ast_tvnow();
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play_dialtone(chan, mailbox);
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for (;;) {
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/* if outa time, give em reorder */
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if (ast_tvdiff_ms(ast_tvnow(), lastdigittime) >
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((k&2) ? digittimeout : firstdigittimeout))
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{
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ast_log(LOG_DEBUG,"DISA %s entry timeout on chan %s\n",
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((k&1) ? "extension" : "password"),chan->name);
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break;
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}
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if ((res = ast_waitfor(chan, -1) < 0)) {
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ast_log(LOG_DEBUG, "Waitfor returned %d\n", res);
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continue;
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}
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f = ast_read(chan);
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if (f == NULL)
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{
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LOCAL_USER_REMOVE(u);
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return -1;
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}
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if ((f->frametype == AST_FRAME_CONTROL) &&
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(f->subclass == AST_CONTROL_HANGUP))
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{
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ast_frfree(f);
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LOCAL_USER_REMOVE(u);
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return -1;
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}
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if (f->frametype == AST_FRAME_VOICE) {
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ast_frfree(f);
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continue;
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}
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/* if not DTMF, just do it again */
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if (f->frametype != AST_FRAME_DTMF)
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{
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ast_frfree(f);
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continue;
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}
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j = f->subclass; /* save digit */
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ast_frfree(f);
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if (i == 0)
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{
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k|=2; /* We have the first digit */
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ast_playtones_stop(chan);
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}
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lastdigittime = ast_tvnow();
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/* got a DTMF tone */
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if (i < AST_MAX_EXTENSION) /* if still valid number of digits */
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{
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if (!(k&1)) /* if in password state */
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{
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if (j == '#') /* end of password */
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{
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/* see if this is an integer */
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if (sscanf(tmp,"%d",&j) < 1)
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{ /* nope, it must be a filename */
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fp = fopen(tmp,"r");
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if (!fp)
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{
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ast_log(LOG_WARNING,"DISA password file %s not found on chan %s\n",tmp,chan->name);
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LOCAL_USER_REMOVE(u);
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return -1;
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}
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tmp[0] = 0;
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while(fgets(tmp,sizeof(tmp) - 1,fp))
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{
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char *stringp=NULL,*stringp2;
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if (!tmp[0]) continue;
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if (tmp[strlen(tmp) - 1] == '\n')
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tmp[strlen(tmp) - 1] = 0;
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if (!tmp[0]) continue;
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/* skip comments */
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if (tmp[0] == '#') continue;
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if (tmp[0] == ';') continue;
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stringp=tmp;
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strsep(&stringp, "|");
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stringp2=strsep(&stringp, "|");
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if (stringp2) {
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ourcontext=stringp2;
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stringp2=strsep(&stringp, "|");
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if (stringp2) ourcallerid=stringp2;
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}
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mailbox = strsep(&stringp, "|");
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if (!mailbox)
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mailbox = "";
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ast_log(LOG_DEBUG, "Mailbox: %s\n",mailbox);
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/* password must be in valid format (numeric) */
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if (sscanf(tmp,"%d",&j) < 1) continue;
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/* if we got it */
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if (!strcmp(exten,tmp)) break;
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}
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fclose(fp);
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}
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/* compare the two */
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if (strcmp(exten,tmp))
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{
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ast_log(LOG_WARNING,"DISA on chan %s got bad password %s\n",chan->name,exten);
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goto reorder;
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}
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/* password good, set to dial state */
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ast_log(LOG_DEBUG,"DISA on chan %s password is good\n",chan->name);
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play_dialtone(chan, mailbox);
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k|=1; /* In number mode */
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i = 0; /* re-set buffer pointer */
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exten[sizeof(acctcode)] = 0;
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ast_copy_string(acctcode, exten, sizeof(acctcode));
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exten[0] = 0;
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ast_log(LOG_DEBUG,"Successful DISA log-in on chan %s\n",chan->name);
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continue;
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}
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}
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exten[i++] = j; /* save digit */
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exten[i] = 0;
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if (!(k&1)) continue; /* if getting password, continue doing it */
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/* if this exists */
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if (ast_ignore_pattern(ourcontext, exten)) {
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play_dialtone(chan, "");
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did_ignore = 1;
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} else
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if (did_ignore) {
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ast_playtones_stop(chan);
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did_ignore = 0;
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}
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/* if can do some more, do it */
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if (!ast_matchmore_extension(chan,ourcontext,exten,1, chan->cid.cid_num)) {
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break;
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}
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}
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}
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if (k == 3) {
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int recheck = 0;
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if (!ast_exists_extension(chan, ourcontext, exten, 1, chan->cid.cid_num)) {
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pbx_builtin_setvar_helper(chan, "INVALID_EXTEN", exten);
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exten[0] = 'i';
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exten[1] = '\0';
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recheck = 1;
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}
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if (!recheck || ast_exists_extension(chan, ourcontext, exten, 1, chan->cid.cid_num)) {
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ast_playtones_stop(chan);
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/* We're authenticated and have a target extension */
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if (ourcallerid && *ourcallerid)
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{
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ast_callerid_split(ourcallerid, ourcidname, sizeof(ourcidname), ourcidnum, sizeof(ourcidnum));
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ast_set_callerid(chan, ourcidnum, ourcidname, ourcidnum);
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}
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if (!ast_strlen_zero(acctcode))
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ast_copy_string(chan->accountcode, acctcode, sizeof(chan->accountcode));
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ast_cdr_reset(chan->cdr, AST_CDR_FLAG_POSTED);
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ast_explicit_goto(chan, ourcontext, exten, 1);
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LOCAL_USER_REMOVE(u);
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return 0;
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}
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}
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/* Received invalid, but no "i" extension exists in the given context */
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reorder:
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ast_indicate(chan,AST_CONTROL_CONGESTION);
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/* something is invalid, give em reorder for several seconds */
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time(&rstart);
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while(time(NULL) < rstart + 10)
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{
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if (ast_waitfor(chan, -1) < 0)
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break;
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f = ast_read(chan);
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if (!f)
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break;
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ast_frfree(f);
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}
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ast_playtones_stop(chan);
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LOCAL_USER_REMOVE(u);
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return -1;
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}
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int unload_module(void)
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{
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int res;
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res = ast_unregister_application(app);
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STANDARD_HANGUP_LOCALUSERS;
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return res;
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}
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int load_module(void)
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{
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return ast_register_application(app, disa_exec, synopsis, descrip);
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}
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char *description(void)
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{
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return tdesc;
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}
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int usecount(void)
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{
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int res;
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STANDARD_USECOUNT(res);
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return res;
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}
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char *key(void)
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{
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return ASTERISK_GPL_KEY;
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}
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