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clip.c
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clip.c
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/*
* clip.c -- clip decoder and packet dump
*
* Copyright (C) 2007
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* ---------------------------------------------------------------------- */
#include "multimon.h"
#include <string.h>
/* ---------------------------------------------------------------------- */
static inline int check_sum256(const unsigned char *buf, int cnt)
{
unsigned int sum = 0;
for (; cnt > 0; cnt--)
sum += *buf++;
return (sum % 256);
}
/* ---------------------------------------------------------------------- */
unsigned char disp_parm(unsigned char *bp, unsigned char param_len)
{
unsigned char i, len;
len=param_len;
while (len) {
i = *bp++;
if ((i >= 32) && (i < 128))
verbprintf(0, "%c",i);
else
verbprintf(0, ".");
len--;
}
return param_len;
}
/*
* As specified in ETSI EN 300 659-3
*/
static void clip_disp_packet(struct demod_state *s, unsigned char *bp, unsigned int len)
{
unsigned char i;
unsigned char msg_len, param_len;
unsigned char *ptr;
if (!bp || len < 5)
return;
#if 1
i=check_sum256(bp, len);
// if (i != 0 && i != 0xf6) {
if (i != 0) {
// verbprintf(0, " CHKSUM=0x%02X SUM=0x%02X PLEN=%d\n", i, *(bp+len-1), len);
return;
}
#endif
len -= 1;
i = *bp++;
switch(i) {
case 0x80: /* Call Setup */
verbprintf(0, "%s: CS", s->dem_par->name);
break;
case 0x82: /* Message Waiting Indicator */
verbprintf(0, "%s: MWI", s->dem_par->name);
break;
case 0x04: /* Reserved */
case 0x84: /* Reserved */
case 0x85: /* Reserved */
verbprintf(0, "%s: RVD len=%d", s->dem_par->name, len+1);
break;
case 0x86: /* Advice of Charge */
verbprintf(0, "%s: AOC len=%d", s->dem_par->name, len+1);
break;
case 0x89: /* Short Message Service */
verbprintf(0, "%s: AOC len=%d", s->dem_par->name, len+1);
break;
default:
verbprintf(0, "%s: UNKNOWN Message type (0x%02x) len=%d ", s->dem_par->name, i, len+1);
// verbprintf(0, "\n");
return;
}
if(!len)
return;
msg_len = *bp++;
if (msg_len > len)
verbprintf(0, " broken packet len=%d\n", msg_len);
while (msg_len > 2) {
i = *bp++;
msg_len--;
switch (i) {
case 0x01: /* Date and Time */
param_len = *bp++;
msg_len -= param_len + 1;
verbprintf(0, " DATE=");
bp += disp_parm(bp, param_len);
break;
case 0x02: /* Calling Line Identity */
param_len = *bp++;
msg_len -= param_len + 1;
verbprintf(0, " CID=");
bp += disp_parm(bp, param_len);
break;
case 0x03: /* Called Line Identity */
param_len = *bp++;
msg_len -= param_len + 1;
verbprintf(0, " CDN=");
bp += disp_parm(bp, param_len);
break;
case 0x04: /* Reason for Absence of Calling Line Identity */
param_len = *bp++;
msg_len -= param_len + 1;
verbprintf(0, " RACLI=");
i = *bp;
bp += disp_parm(bp, param_len);
switch (i) {
case 'O':
verbprintf(0, " Unavailable");
break;
case 'P':
verbprintf(0, " Private (CLIR involved)");
break;
default:
verbprintf(0, " (0x%02x indicator unknown)", i);
break;
}
break;
case 0x07: /* Calling Party Name */
param_len = *bp++;
msg_len -= param_len + 1;
verbprintf(0, " CNT=");
bp += disp_parm(bp, param_len);
break;
case 0x08: /* Reason for Absence of Calling Line Identity */
param_len = *bp++;
msg_len -= param_len + 1;
verbprintf(0, " RACNT=");
i = *bp;
bp += disp_parm(bp, param_len);
switch (i) {
case 'O':
verbprintf(0, " Unavailable");
break;
case 'P':
verbprintf(0, " Private (CLIR involved)");
break;
default:
verbprintf(0, " (0x%02x indicator unknown)", i);
break;
}
break;
case 0x0B: /* Visual Indicator parameter type */
param_len = *bp++;
msg_len -= param_len + 1;
verbprintf(0, " VI=");
i = *bp;
bp += disp_parm(bp, param_len);
switch (i) {
case 0:
verbprintf(0, " Deactivation (indicator off)");
break;
case 0xff:
verbprintf(0, " Activation (indicator on)");
break;
default:
verbprintf(0, " (0x%02x indicator unknown)", i);
break;
}
break;
case 0x0D: /* Message Identification */
ptr = bp;
param_len = *bp++;
msg_len -= param_len + 1;
verbprintf(0, " MI=");
i = *bp;
bp += disp_parm(bp, param_len);
switch (i) {
case 0:
verbprintf(0, " Removed Message");
break;
case 0x55:
verbprintf(0, " Message Reference only");
break;
case 0xff:
verbprintf(0, " Added Message");
break;
default:
verbprintf(0, " (0x%02x unknown)", i);
break;
}
verbprintf(0, " Message Reference:", *(ptr+3) * 0x100 + *(ptr+4));
break;
case 0x11: /* Call type */
param_len = *bp++;
msg_len -= param_len + 1;
verbprintf(0, " CT=");
i = *bp;
bp += disp_parm(bp, param_len);
switch (i) {
case 0:
verbprintf(0, " Voice call");
break;
case 0x02:
verbprintf(0, " Ring-back-when-free call");
break;
case 0x81:
verbprintf(0, " Message waiting call");
break;
default:
verbprintf(0, " (0x%02x indicator unknown)", i);
break;
}
break;
case 0x13: /* Number of Messages (Network Message System Status parameter type) */
param_len = *bp++;
msg_len -= param_len + 1;
verbprintf(0, " NMSS=");
i = *bp++;
verbprintf(0, "%d Number of message waiting in message system",i);
param_len--;
break;
case 0x20: /* Charge */
ptr = bp;
param_len = *bp++;
msg_len -= param_len + 1;
verbprintf(0, " CH=");
i = *(ptr+6);
bp += disp_parm(bp, param_len);
verbprintf(0, " CUR=%c%c%c", *ptr, *(ptr+3), *(ptr+4) );
verbprintf(0, (i & 1)?" Free of Charge":" Normal charge" );
verbprintf(0, (i & 2)?" Subtotal (AOC-D)":" Total (AOC-E)" );
verbprintf(0, (i & 4)?" Credit/Debit Card Charging":" Normal charging" );
verbprintf(0, (i & 8)?" Charging information not available":" Charging information available" );
verbprintf(0, (i & 0x10)?" Charged units or, charged units and price per unit":" Currency amount" );
if ( (i & 0x60) == 0 ) {
verbprintf(0, " Current call charge");
}
else if ( (i & 0x60) == 0x20 ) {
verbprintf(0, " Accumulated charge (last call included)");
}
else if ( (i & 0x60) == 0x40 ) {
verbprintf(0, " Extra charge cumulated charging, e.g. call forwarded calls.");
}
else {
verbprintf(0, " (for future use)");
}
/* byte 7-16: Cost (10 digits): Digit 1 (most significant digit) or Units (5 digits): Digit 1 (most significant digit) */
break;
case 0x21: /* Additional Charge */
ptr = bp;
param_len = *bp++;
msg_len -= param_len + 1;
verbprintf(0, " ACH=");
i = *(ptr+6);
bp += disp_parm(bp, param_len);
verbprintf(0, " CUR=%c%c%c", *ptr, *(ptr+3), *(ptr+4) );
verbprintf(0, (i & 1)?" Free of Charge":" Normal charging" );
verbprintf(0, (i & 2)?" Subtotal (AOC-D)":" Total (AOC-E)" );
verbprintf(0, (i & 4)?" Credit/Debit Card Charging":" Normal billing" );
verbprintf(0, (i & 8)?" Charging information not available":" Charging information available" );
verbprintf(0, (i & 0x10)?" Charged units or, charged units and price per unit":" Currency amount" );
if ( (i & 0x60) == 0 ) {
verbprintf(0, " Current call charge");
}
else if ( (i & 0x60) == 0x20 ) {
verbprintf(0, " Accumulated charge (last call included)");
}
else if ( (i & 0x60) == 0x40 ) {
verbprintf(0, " Extra charge cumulated charging, e.g. call forwarded calls.");
}
else {
verbprintf(0, " (for future use)");
}
/* byte 7-16: Cost (10 digits): Digit 1 (most significant digit) or Units (5 digits): Digit 1 (most significant digit) */
break;
case 0x50: /* Display Information */
ptr = bp;
param_len = *bp++;
msg_len -= param_len + 1;
i = *bp++;
if ( (i & 0x70) == 0) {
switch ( i & 0xf ) {
case 0:
verbprintf(0, " Unknown or other");
break;
case 1:
verbprintf(0, " Positive acknowledgement");
break;
case 3:
verbprintf(0, " Negative acknowledgement");
break;
case 4:
verbprintf(0, " Advertisement");
break;
case 5:
verbprintf(0, " Network Provider Information");
break;
case 6:
verbprintf(0, " Remote User Provided information");
break;
default:
verbprintf(0, " unknown (0x%02x)", i);
break;
}
}
else if ( (i & 0x70) == 0x70) {
verbprintf(0, " Reserved for network operator use");
}
else {
verbprintf(0, " unknown (0x%02x)", i);
}
verbprintf(0, (i & 0x80)?" Stored information":" No stored information" );
verbprintf(0, " SMS=");
bp += disp_parm(bp, param_len-1);
break;
case 0x55: /* Service Information */
msg_len--;
break; /* This has a problem because on msg errors displays the sync burst as SI messages */
param_len = *bp++;
msg_len -= param_len + 1;
verbprintf(0, " SI=");
i = *bp;
bp += disp_parm(bp, param_len);
switch (i) {
case 0:
verbprintf(0, " Service not active");
break;
case 0xff:
verbprintf(0, " Service active");
break;
default:
verbprintf(0, " (0x%02x unknown)", i);
break;
}
break;
default:
msg_len--;
verbprintf(0, " unknown (0x%x)%c",i);
break;
}
}
if (!len) {
// verbprintf(0, "\n");
return;
}
verbprintf(0, "\n");
}
/* ---------------------------------------------------------------------- */
void clip_init(struct demod_state *s)
{
memset(&s->l2.uart, 0, sizeof(s->l2.uart));
s->l2.uart.rxptr = s->l2.uart.rxbuf;
}
/* ---------------------------------------------------------------------- */
void clip_rxbit(struct demod_state *s, int bit)
{
s->l2.uart.rxbitstream <<= 1;
s->l2.uart.rxbitstream |= !!bit;
if (!s->l2.uart.rxstate) {
switch (s->l2.uart.rxbitstream & 0x03) {
case 0x02: /* start bit */
s->l2.uart.rxstate = 1;
s->l2.uart.rxbitbuf = 0x100;
break;
case 0x00: /* no start bit */
case 0x03: /* consecutive stop bits*/
if ((s->l2.uart.rxptr - s->l2.uart.rxbuf) >= 1)
clip_disp_packet(s, s->l2.uart.rxbuf, s->l2.uart.rxptr - s->l2.uart.rxbuf);
s->l2.uart.rxptr = s->l2.uart.rxbuf;
break;
}
return;
}
if (s->l2.uart.rxbitstream & 1)
s->l2.uart.rxbitbuf |= 0x200;
// verbprintf(7, "b=%c", '0'+(s->l2.uart.rxbitstream & 1));
if (s->l2.uart.rxbitbuf & 1) {
if (s->l2.uart.rxptr >= s->l2.uart.rxbuf+sizeof(s->l2.uart.rxbuf)) {
s->l2.uart.rxstate = 0;
clip_disp_packet(s, s->l2.uart.rxbuf, s->l2.uart.rxptr - s->l2.uart.rxbuf);
verbprintf(1, "Error: packet size too large\n");
return;
}
if ( !(s->l2.uart.rxbitstream & 1) ) {
s->l2.uart.rxstate = 0;
verbprintf(1, "Error: stop bit is 0. Bad framing\n");
return;
}
*s->l2.uart.rxptr++ = s->l2.uart.rxbitbuf >> 1;
// verbprintf(6, "B=%02X ", (s->l2.uart.rxbitbuf >> 1) & 0xff);
// verbprintf(5, "%c", (s->l2.uart.rxbitbuf >> 1) & 0xff);
s->l2.uart.rxbitbuf = 0x100;
s->l2.uart.rxstate = 0;
return;
}
s->l2.uart.rxbitbuf >>= 1;
}
/* ---------------------------------------------------------------------- */