![markster](/assets/img/avatar_default.png)
git-svn-id: http://svn.digium.com/svn/asterisk/trunk@3874 f38db490-d61c-443f-a65b-d21fe96a405b
366 lines
10 KiB
C
Executable file
366 lines
10 KiB
C
Executable file
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* DISA -- Direct Inward System Access Application 6/20/2001
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*
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* Copyright (C) 2001-2004, 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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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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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/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 <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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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 (Direct Inward System Access) -- Allows someone from outside\n"
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"the telephone switch (PBX) to obtain an \"internal\" system dialtone\n"
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"and to place calls from it as if they were placing a call from within\n"
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"the switch. A user calls a number that connects to the DISA application\n"
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"and is given dialtone. The user enters their passcode, followed by the\n"
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"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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"but be aware of using this for your security compromising.\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 password (that everyone uses), or\n"
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"individual passwords 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 that 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. The arguments are\n"
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"one of the following:\n\n"
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" numeric-passcode\n"
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" numeric-passcode|context\n"
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" full-pathname-of-file-that-contains-passcodes\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>. 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 parses the dialed number in\n"
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"the specified (or default) context, and returns 0 with the new extension\n"
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"context filled-in and the priority set to 1, so that the PBX may\n"
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"re-apply the routing tables to it and complete the call normally.";
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STANDARD_LOCAL_USER;
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LOCAL_USER_DECL;
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static int firstdigittimeout = 20000; /* 20 seconds first digit timeout */
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static int digittimeout = 10000; /* 10 seconds subsequent digit timeout */
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static int ms_diff(struct timeval *tv1, struct timeval *tv2)
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{
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int ms;
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ms = (tv1->tv_sec - tv2->tv_sec) * 1000;
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ms += (tv1->tv_usec - tv2->tv_usec) / 1000;
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return(ms);
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}
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static void play_dialtone(struct ast_channel *chan)
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{
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const struct tone_zone_sound *ts = NULL;
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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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struct localuser *u;
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char tmp[256],arg2[256]="",exten[AST_MAX_EXTENSION],acctcode[20]="";
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char *ourcontext,*ourcallerid;
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struct ast_frame *f;
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struct timeval lastout, now, 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_set_write_format(chan,AST_FORMAT_ULAW))
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{
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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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return -1;
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}
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if (ast_set_read_format(chan,AST_FORMAT_ULAW))
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{
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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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return -1;
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}
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lastout.tv_sec = lastout.tv_usec = 0;
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if (!data || !strlen((char *)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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strncpy(tmp, (char *)data, sizeof(tmp)-1);
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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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strncpy(arg2,ourcontext, sizeof(arg2) - 1);
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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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LOCAL_USER_ADD(u);
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if (chan->_state != AST_STATE_UP)
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{
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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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{;
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k = 1;
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ast_log(LOG_DEBUG, "DISA no-password login success\n");
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}
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gettimeofday(&lastdigittime,NULL);
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play_dialtone(chan);
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for(;;)
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{
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gettimeofday(&now,NULL);
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/* if outa time, give em reorder */
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if (ms_diff(&now,&lastdigittime) >
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((k) ? 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) ? "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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ast_playtones_stop(chan);
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gettimeofday(&lastdigittime,NULL);
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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) /* 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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/* 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);
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k = 1;
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i = 0; /* re-set buffer pointer */
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exten[sizeof(acctcode)] = 0;
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strncpy(acctcode,exten, sizeof(acctcode) - 1);
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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) 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 && ast_exists_extension(chan,ourcontext,exten,1, chan->cid.cid_num))
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{
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ast_playtones_stop(chan);
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/* We're authenticated and have a valid extension */
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if (ourcallerid && *ourcallerid)
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{
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if (chan->cid.cid_num) free(chan->cid.cid_num);
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chan->cid.cid_num = strdup(ourcallerid);
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}
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strncpy(chan->exten, exten, sizeof(chan->exten) - 1);
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strncpy(chan->context, ourcontext, sizeof(chan->context) - 1);
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strncpy(chan->accountcode, acctcode, sizeof(chan->accountcode) - 1);
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chan->priority = 0;
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ast_cdr_init(chan->cdr,chan);
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LOCAL_USER_REMOVE(u);
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return 0;
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}
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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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STANDARD_HANGUP_LOCALUSERS;
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return ast_unregister_application(app);
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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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