--- /dev/null
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * DISA -- Direct Inward System Access Application 6/20/2001
+ *
+ * Copyright (C) 2001, Linux Support Services, Inc.
+ *
+ * Jim Dixon <jim@lambdatel.com>
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+
+#include <asterisk/file.h>
+#include <asterisk/logger.h>
+#include <asterisk/channel.h>
+#include <asterisk/pbx.h>
+#include <asterisk/module.h>
+#include <asterisk/translate.h>
+#include <asterisk/ulaw.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <pthread.h>
+#include <sys/time.h>
+
+#define TONE_BLOCK_SIZE 200
+
+static char *tdesc = "DISA (Direct Inward System Access) Application";
+
+static char *app = "DISA";
+
+static char *synopsis = "DISA (Direct Inward System Access)";
+
+static char *descrip =
+ "DISA (Direct Inward System Access) -- Allows someone from outside\n"
+ "the telephone switch (PBX) to obtain an \"internal\" system dialtone\n"
+ "and to place calls from it as if they were placing a call from within\n"
+ "the switch. A user calls a number that connects to the DISA application\n"
+ "and is given dialtone. The user enters their passcode, followed by the\n"
+ "pound sign (#). If the passcode is correct, the user is then given\n"
+ "system dialtone on which a call may be placed. Obviously, this type\n"
+ "of access has SERIOUS security implications, and GREAT care must be\n"
+ "taken NOT to compromise your security.\n\n"
+ "There is a possibility of accessing DISA without password. Simply\n"
+ "exchange your password with no-password.\n\n"
+ " Example: exten => s,1,DISA,no-password|local\n\n"
+ "but be aware of using this for your security compromising.\n\n"
+ "The arguments to this application (in extensions.conf) allow either\n"
+ "specification of a single global password (that everyone uses), or\n"
+ "individual passwords contained in a file. It also allow specification\n"
+ "of the context on which the user will be dialing. If no context is\n"
+ "specified, the DISA application defaults the context to \"disa\"\n"
+ "presumably that a normal system will have a special context set up\n"
+ "for DISA use with some or a lot of restrictions. The arguments are\n"
+ "one of the following:\n\n"
+ " numeric-passcode\n"
+ " numeric-passcode|context\n"
+ " full-pathname-of-file-that-contains-passcodes\n\n"
+ "The file that contains the passcodes (if used) allows specification\n"
+ "of either just a passcode (defaulting to the \"disa\" context, or\n"
+ "passcode|context on each line of the file. The file may contain blank\n"
+ "lines, or comments starting with \"#\" or \";\".\n\n"
+ "If login is successful, the application parses the dialed number in\n"
+ "the specified (or default) context, and returns 0 with the new extension\n"
+ "context filled-in and the priority set to 1, so that the PBX may\n"
+ "re-apply the routing tables to it and complete the call normally.";
+
+
+STANDARD_LOCAL_USER;
+
+LOCAL_USER_DECL;
+
+static float loudness=8192.0;
+
+int firstdigittimeout = 10000; /* 10 seconds first digit timeout */
+int digittimeout = 5000; /* 5 seconds subsequent digit timeout */
+
+static void make_tone_block(unsigned char *data, float f1, float f2, int *x);
+
+static void make_tone_block(unsigned char *data, float f1, float f2, int *x)
+{
+int i;
+float val;
+
+ for(i = 0; i < TONE_BLOCK_SIZE; i++)
+ {
+ val = loudness * sin((f1 * 2.0 * M_PI * (*x))/8000.0);
+ val += loudness * sin((f2 * 2.0 * M_PI * (*x)++)/8000.0);
+ data[i] = ast_lin2mu[(int)val + 32768];
+ }
+ /* wrap back around from 8000 */
+ if (*x >= 8000) *x = 0;
+ return;
+}
+
+static int ms_diff(struct timeval *tv1, struct timeval *tv2)
+{
+int ms;
+
+ ms = (tv1->tv_sec - tv2->tv_sec) * 1000;
+ ms += (tv1->tv_usec - tv2->tv_usec) / 1000;
+ return(ms);
+}
+
+static int disa_exec(struct ast_channel *chan, void *data)
+{
+ int i,j,k,x;
+ struct localuser *u;
+ char tmp[256],exten[AST_MAX_EXTENSION];
+ unsigned char tone_block[TONE_BLOCK_SIZE],sil_block[TONE_BLOCK_SIZE];
+ char *ourcontext;
+ struct ast_frame *f,wf;
+ fd_set readfds;
+ int waitfor_notime;
+ struct timeval notime = { 0,0 }, lastout, now, lastdigittime;
+ FILE *fp;
+
+ if (ast_set_write_format(chan,AST_FORMAT_ULAW))
+ {
+ ast_log(LOG_WARNING, "Unable to set write format to Mu-law on %s\n",chan->name);
+ return -1;
+ }
+ if (ast_set_read_format(chan,AST_FORMAT_ULAW))
+ {
+ ast_log(LOG_WARNING, "Unable to set read format to Mu-law on %s\n",chan->name);
+ return -1;
+ }
+ lastout.tv_sec = lastout.tv_usec = 0;
+ /* make block of silence */
+ memset(sil_block,0x7f,TONE_BLOCK_SIZE);
+ if (!data || !strlen((char *)data)) {
+ ast_log(LOG_WARNING, "disa requires an argument (passcode/passcode file)\n");
+ return -1;
+ }
+ strncpy(tmp, (char *)data, sizeof(tmp));
+ strtok(tmp, "|");
+ ourcontext = strtok(NULL, "|");
+ /* if context not specified, use "disa" */
+ if (!ourcontext) ourcontext = "disa";
+ LOCAL_USER_ADD(u);
+ if (chan->state != AST_STATE_UP)
+ {
+ /* answer */
+ ast_answer(chan);
+ }
+ i = k = x = 0; /* k is 0 for pswd entry, 1 for ext entry */
+ exten[0] = 0;
+ /* can we access DISA without password? */
+ if (!strcasecmp(tmp, "no-password"))
+ {
+ k = 1;
+ ast_log(LOG_DEBUG, "DISA no-password login success\n");
+ }
+ gettimeofday(&lastdigittime,NULL);
+ for(;;)
+ {
+ gettimeofday(&now,NULL);
+ /* if outa time, give em reorder */
+ if (ms_diff(&now,&lastdigittime) >
+ ((k) ? digittimeout : firstdigittimeout))
+ {
+ ast_log(LOG_DEBUG,"DISA %s entry timeout on chan %s\n",
+ ((k) ? "extension" : "password"),chan->name);
+ goto reorder;
+ }
+ /* if first digit or ignore, send dialtone */
+ if ((!i) || (ast_ignore_pattern(ourcontext,exten) && k))
+ {
+ gettimeofday(&now,NULL);
+ if (lastout.tv_sec &&
+ (ms_diff(&now,&lastout) < 25)) continue;
+ lastout.tv_sec = now.tv_sec;
+ lastout.tv_usec = now.tv_usec;
+ wf.frametype = AST_FRAME_VOICE;
+ wf.subclass = AST_FORMAT_ULAW;
+ wf.offset = AST_FRIENDLY_OFFSET;
+ wf.mallocd = 0;
+ wf.data = tone_block;
+ wf.datalen = TONE_BLOCK_SIZE;
+ /* make this tone block */
+ make_tone_block(tone_block,350.0,440.0,&x);
+ wf.timelen = wf.datalen / 8;
+ if (ast_write(chan, &wf))
+ {
+ ast_log(LOG_WARNING, "DISA Failed to write frame on %s\n",chan->name);
+ LOCAL_USER_REMOVE(u);
+ return -1;
+ }
+ }
+ waitfor_notime = notime.tv_usec + notime.tv_sec * 1000;
+ if (!ast_waitfor_nandfds(&chan, 1, &(chan->fds[0]), 1, NULL, NULL,
+ &waitfor_notime)) continue;
+ f = ast_read(chan);
+ if (f == NULL)
+ {
+ LOCAL_USER_REMOVE(u);
+ return -1;
+ }
+ if ((f->frametype == AST_FRAME_CONTROL) &&
+ (f->subclass == AST_CONTROL_HANGUP))
+ {
+ ast_frfree(f);
+ LOCAL_USER_REMOVE(u);
+ return -1;
+ }
+ /* if not DTMF, just do it again */
+ if (f->frametype != AST_FRAME_DTMF)
+ {
+ ast_frfree(f);
+ continue;
+ }
+ j = f->subclass; /* save digit */
+ ast_frfree(f);
+ gettimeofday(&lastdigittime,NULL);
+ /* got a DTMF tone */
+ if (i < AST_MAX_EXTENSION) /* if still valid number of digits */
+ {
+ if (!k) /* if in password state */
+ {
+ if (j == '#') /* end of password */
+ {
+ /* see if this is an integer */
+ if (sscanf(tmp,"%d",&j) < 1)
+ { /* nope, it must be a filename */
+ fp = fopen(tmp,"r");
+ if (!fp)
+ {
+ ast_log(LOG_WARNING,"DISA password file %s not found on chan %s\n",tmp,chan->name);
+ LOCAL_USER_REMOVE(u);
+ return -1;
+ }
+ tmp[0] = 0;
+ while(fgets(tmp,sizeof(tmp) - 1,fp))
+ {
+ if (!tmp[0]) continue;
+ if (tmp[strlen(tmp) - 1] == '\n')
+ tmp[strlen(tmp) - 1] = 0;
+ if (!tmp[0]) continue;
+ /* skip comments */
+ if (tmp[0] == '#') continue;
+ if (tmp[0] == ';') continue;
+ strtok(tmp, "|");
+ ourcontext = strtok(NULL, "|");
+ /* password must be in valid format (numeric) */
+ if (sscanf(tmp,"%d",&j) < 1) continue;
+ /* if we got it */
+ if (!strcmp(exten,tmp)) break;
+ }
+ fclose(fp);
+ }
+ /* compare the two */
+ if (strcmp(exten,tmp))
+ {
+ ast_log(LOG_WARNING,"DISA on chan %s got bad password %s\n",chan->name,exten);
+ goto reorder;
+ }
+ /* password good, set to dial state */
+ k = 1;
+ i = 0; /* re-set buffer pointer */
+ exten[0] = 0;
+ ast_log(LOG_DEBUG,"Successful DISA log-in on chan %s\n",chan->name);
+ continue;
+ }
+ }
+ exten[i++] = j; /* save digit */
+ exten[i] = 0;
+ if (!k) continue; /* if getting password, continue doing it */
+ /* if this exists */
+ if (ast_exists_extension(chan,ourcontext,exten,1, chan->callerid))
+ {
+ strcpy(chan->exten,exten);
+ strcpy(chan->context,ourcontext);
+ chan->priority = 0;
+ LOCAL_USER_REMOVE(u);
+ return 0;
+ }
+ /* if can do some more, do it */
+ if (ast_canmatch_extension(chan,ourcontext,exten,1, chan->callerid)) continue;
+ }
+reorder:
+ /* something is invalid, give em reorder forever */
+ x = 0;
+ for(;;)
+ {
+ for(i = 0; i < 10; i++)
+ {
+ do gettimeofday(&now,NULL);
+ while (lastout.tv_sec &&
+ (ms_diff(&now,&lastout) < 25)) ;
+ lastout.tv_sec = now.tv_sec;
+ lastout.tv_usec = now.tv_usec;
+ wf.frametype = AST_FRAME_VOICE;
+ wf.subclass = AST_FORMAT_ULAW;
+ wf.offset = AST_FRIENDLY_OFFSET;
+ wf.mallocd = 0;
+ wf.data = tone_block;
+ wf.datalen = TONE_BLOCK_SIZE;
+ /* make this tone block */
+ make_tone_block(tone_block,480.0,620.0,&x);
+ wf.timelen = wf.datalen / 8;
+ if (ast_write(chan, &wf))
+ {
+ ast_log(LOG_WARNING, "DISA Failed to write frame on %s\n",chan->name);
+ LOCAL_USER_REMOVE(u);
+ return -1;
+ }
+ FD_ZERO(&readfds);
+ FD_SET(chan->fds[0],&readfds);
+ /* if no read avail, do send again */
+ if (select(chan->fds[0] + 1,&readfds,NULL,
+ NULL,¬ime) < 1) continue;
+ /* read frame */
+ f = ast_read(chan);
+ if (f == NULL)
+ {
+ LOCAL_USER_REMOVE(u);
+ return -1;
+ }
+ if ((f->frametype == AST_FRAME_CONTROL) &&
+ (f->subclass == AST_CONTROL_HANGUP))
+ {
+ ast_frfree(f);
+ LOCAL_USER_REMOVE(u);
+ return -1;
+ }
+ ast_frfree(f);
+ }
+ for(i = 0; i < 10; i++)
+ {
+ do gettimeofday(&now,NULL);
+ while (lastout.tv_sec &&
+ (ms_diff(&now,&lastout) < 25)) ;
+ lastout.tv_sec = now.tv_sec;
+ lastout.tv_usec = now.tv_usec;
+ wf.frametype = AST_FRAME_VOICE;
+ wf.subclass = AST_FORMAT_ULAW;
+ wf.offset = AST_FRIENDLY_OFFSET;
+ wf.mallocd = 0;
+ wf.data = sil_block;
+ wf.datalen = TONE_BLOCK_SIZE;
+ wf.timelen = wf.datalen / 8;
+ if (ast_write(chan, &wf))
+ {
+ ast_log(LOG_WARNING, "DISA Failed to write frame on %s\n",chan->name);
+ LOCAL_USER_REMOVE(u);
+ return -1;
+ }
+ FD_ZERO(&readfds);
+ FD_SET(chan->fds[0],&readfds);
+ /* if no read avail, do send again */
+ if (select(chan->fds[0] + 1,&readfds,NULL,
+ NULL,¬ime) < 1) continue;
+ /* read frame */
+ f = ast_read(chan);
+ if (f == NULL)
+ {
+ LOCAL_USER_REMOVE(u);
+ return -1;
+ }
+ if ((f->frametype == AST_FRAME_CONTROL) &&
+ (f->subclass == AST_CONTROL_HANGUP))
+ {
+ ast_frfree(f);
+ LOCAL_USER_REMOVE(u);
+ return -1;
+ }
+ ast_frfree(f);
+ }
+ }
+ }
+}
+
+int unload_module(void)
+{
+ STANDARD_HANGUP_LOCALUSERS;
+ return ast_unregister_application(app);
+}
+
+int load_module(void)
+{
+ return ast_register_application(app, disa_exec, synopsis, descrip);
+}
+
+char *description(void)
+{
+ return tdesc;
+}
+
+int usecount(void)
+{
+ int res;
+ STANDARD_USECOUNT(res);
+ return res;
+}
+
+char *key()
+{
+ return ASTERISK_GPL_KEY;
+}
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