Version 0.1.9 from FTP

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@354 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_disa.c

@@ -0,0 +1,401 @@
+/*
+ * 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,&notime) < 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,&notime) < 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;
+}