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chan-capi/chan_capi_qsig_asn197ade.c

186 lines
4.9 KiB

/*
* An implementation of Common ISDN API 2.0 for Asterisk
*
* Copyright (C) 2005-2008 Cytronics & Melware
* Copyright (C) 2007 Mario Goegel
*
* Armin Schindler <armin@melware.de>
* Mario Goegel <m.goegel@gmx.de>
*
* This program is free software and may be modified and
* distributed under the terms of the GNU Public License.
*/
/*
* Decoding of addressing-data-elements from asn1-97
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "chan_capi_platform.h"
#include "chan_capi20.h"
#include "chan_capi.h"
#include "chan_capi_utils.h"
#include "chan_capi_qsig.h"
#include "chan_capi_qsig_ecma.h"
#include "chan_capi_qsig_asn197ade.h"
/*
* Returns an "Party Number" from an string, encoded as in addressing-data-elements-asn1-97
* data should be a buffer with max. 20 bytes, according to spec
* return:
* index counter
*/
unsigned int cc_qsig_asn197ade_get_partynumber(char *buf, int buflen, int *idx, unsigned char *data)
{
int myidx = *idx;
int datalength;
int numtype;
datalength = data[myidx++];
if (!datalength) {
return 0;
}
numtype = (data[myidx++] & 0x0F); /* defines type of Number: numDigits, publicPartyNum, nsapEncNum, dataNumDigits */
/* cc_qsig_verbose( 1, VERBOSE_PREFIX_4 " * num type %i,%i\n", numtype, myidx); */
switch (numtype){
case 0:
if (data[myidx] > 0) { /* length of this context data */
if (data[myidx+1] == ASN1_TC_CONTEXTSPEC) {
myidx += 2;
myidx += cc_qsig_asn197ade_get_numdigits(buf, buflen, &myidx, data);
} else {
myidx += cc_qsig_asn197ade_get_numdigits(buf, buflen, &myidx, data);
}
}
break;
case 1: /* publicPartyNumber (E.164) not supported yet */
return 0;
break;
case 2: /* NsapEncodedNumber (some ATM stuff) not supported yet */
return 0;
break;
case 3:
if (data[myidx++] > 0) { /* length of this context data */
if (data[myidx+1] == ASN1_TC_CONTEXTSPEC) {
myidx += 2;
myidx += cc_qsig_asn197ade_get_numdigits(buf, buflen, &myidx, data);
} else {
myidx += cc_qsig_asn197ade_get_numdigits(buf, buflen, &myidx, data);
}
}
break;
};
/* cc_qsig_verbose( 1, VERBOSE_PREFIX_4 " * num type %i,%i\n", numtype, myidx); */
return myidx - *idx;
}
/*
* Returns an string from ASN.1 encoded string
*/
unsigned int cc_qsig_asn197ade_get_numdigits(char *buf, int buflen, int *idx, unsigned char *data)
{
int strsize;
int myidx = *idx;
strsize = data[myidx++];
if (strsize > buflen)
strsize = buflen;
memcpy(buf, &data[myidx], strsize);
buf[strsize] = 0;
/* cc_qsig_verbose( 1, VERBOSE_PREFIX_4 " * string length %i,%i\n", strsize, *idx); */
return strsize;
}
/*
* Returns an string from ASN.1 encoded string
*/
unsigned int cc_qsig_asn197ade_add_numdigits(char *buf, int buflen, int *idx, unsigned char *data)
{
int myidx=0;
if ((1 + buflen) > sizeof(*buf)) {
/* String exceeds buffer size */
return 0;
}
buf[myidx++] = buflen;
memcpy(&buf[myidx], data, buflen);
myidx = 1 + strlen(buf);
return myidx;
}
/*
* Returns an "PresentedNumberScreened" from an string, encoded as in addressing-data-elements-asn1-97
* data is pointer to PresentedNumberScreened struct
* return:
* index counter
*/
unsigned int cc_qsig_asn197ade_get_pns(unsigned char *data, int *idx, struct asn197ade_numberscreened *ns)
{ /* sample data: a0 08 80 03>513<0a 01 00 */
int myidx = *idx;
char buf[ASN197ADE_NUMDIGITS_STRSIZE+1];
unsigned int buflen = sizeof(buf);
unsigned res;
int numtype;
ns->partyNumber = NULL;
ns->screeningInd = userProvidedNotScreened;
numtype = (data[myidx++] & 0x0F); /* defines type of Number */
/* cc_qsig_verbose( 1, VERBOSE_PREFIX_4 " * num type %i,%i\n", numtype, myidx); */
switch (numtype){
case 0:
/* myidx points now to length */
res = cc_qsig_asn197ade_get_partynumber(buf, buflen, &myidx, data);
/* cc_qsig_verbose( 1, VERBOSE_PREFIX_4 " * res %i\n", numtype); */
if (!res)
return 0;
myidx += res;
if (strlen(buf)) {
ns->partyNumber = ast_strdup(buf);
}
/* get screening indicator */
if (data[myidx] == ASN1_ENUMERATED) { /* HACK: this is not safe - check length of this parameter */
myidx++;
ns->screeningInd = cc_qsig_asn1_get_integer(data, &myidx);
}
break;
case 1: /* presentation restricted */
myidx += data[myidx] + 1; /* this val should be zero */
break;
case 2: /* number not available due to interworking */
myidx += data[myidx] + 1; /* this val should be zero */
break;
case 3:
/* myidx points now to length */
res = cc_qsig_asn197ade_get_partynumber(buf, buflen, &myidx, data);
if (!res)
return 0;
myidx += res;
if (strlen(buf)) {
ns->partyNumber = ast_strdup(buf);
}
/* get screening indicator */
if (data[myidx] == ASN1_ENUMERATED) { /* HACK: this is not safe - check length of this parameter */
myidx++;
ns->screeningInd = cc_qsig_asn1_get_integer(data, &myidx);
}
break;
};
return myidx - *idx;
}