102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
|
/*
|
||
|
|
* (CAPI*)
|
||
|
|
*
|
||
|
|
* An implementation of Common ISDN API 2.0 for
|
||
|
|
* Asterisk / OpenPBX.org
|
||
|
|
*
|
||
|
|
* Copyright (C) 2005-2007 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 name-operations from asn1-97
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#include <asterisk/channel.h>
|
||
|
|
#include <asterisk/options.h>
|
||
|
|
#include "chan_capi20.h"
|
||
|
|
#include "chan_capi.h"
|
||
|
|
#include "chan_capi_qsig.h"
|
||
|
|
#include "chan_capi_qsig_asn197no.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Returns an "Name" from an string, encoded as in name-operations-asn1-97
|
||
|
|
* data should be a buffer with max. 50 bytes, according to spec
|
||
|
|
* bufds returns size of name in "buf"
|
||
|
|
* return:
|
||
|
|
* index counter
|
||
|
|
*/
|
||
|
|
|
||
|
|
unsigned int cc_qsig_asn197no_get_name(unsigned char *buf, int buflen, unsigned int *bufds, int *idx, unsigned char *data)
|
||
|
|
{
|
||
|
|
unsigned int myidx = *idx;
|
||
|
|
unsigned int nametag;
|
||
|
|
unsigned int namelength = 0;
|
||
|
|
unsigned int nametype;
|
||
|
|
unsigned int namesetlength = 0;
|
||
|
|
unsigned int namepres;
|
||
|
|
unsigned int charset = 1;
|
||
|
|
unsigned int seqlength = 0;
|
||
|
|
|
||
|
|
nametag = data[myidx++];
|
||
|
|
if (nametag == (ASN1_SEQUENCE | ASN1_TC_UNIVERSAL | ASN1_TF_CONSTRUCTED)) { /* 0x30 */
|
||
|
|
/* This facility is encoded as SEQUENCE */
|
||
|
|
seqlength = data[++myidx];
|
||
|
|
myidx++;
|
||
|
|
cc_verbose(1, 1, VERBOSE_PREFIX_4 " Got name sequence (Length= %i)\n", seqlength);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (nametag < 0x80) { /* Tag shows an simple String */
|
||
|
|
namelength = cc_qsig_asn1_get_string((unsigned char *)buf, buflen, &data[myidx]);
|
||
|
|
} else { /* Tag shows an context specific String */
|
||
|
|
nametype = (nametag & 0x0F); /* Type of Name-Struct */
|
||
|
|
namepres = nametype; /* Name Presentation or Restriction */
|
||
|
|
|
||
|
|
switch (nametype) {
|
||
|
|
case 0: /* Simple Name */
|
||
|
|
case 2: /* [LENGTH] [STRING] */
|
||
|
|
namelength = cc_qsig_asn1_get_string((unsigned char *)buf, buflen, &data[myidx]);
|
||
|
|
break;
|
||
|
|
case 1: /* Nameset */
|
||
|
|
case 3: /* [LENGTH] [BIT-STRING] [LENGTH] [STRING] [INTEGER] [LENGTH] [VALUE] */
|
||
|
|
namesetlength = data[myidx++];
|
||
|
|
if (data[myidx++] == ASN1_OCTETSTRING) {
|
||
|
|
/* should be so */
|
||
|
|
namelength = cc_qsig_asn1_get_string((unsigned char *)buf, buflen, &data[myidx]);
|
||
|
|
myidx += data[myidx-1]; /* is this safe? */
|
||
|
|
} else {
|
||
|
|
cc_verbose(1, 1, VERBOSE_PREFIX_4 " Namestruct not ECMA conform (String expected)\n");
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (data[myidx++] == ASN1_INTEGER) {
|
||
|
|
charset=cc_qsig_asn1_get_integer(data, &myidx);
|
||
|
|
} else {
|
||
|
|
cc_verbose(1, 1, VERBOSE_PREFIX_4 " Namestruct not ECMA conform (Integer expected)\n");
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 4: /* Name not available */
|
||
|
|
break;
|
||
|
|
case 7: /* Namepres. restricted NULL - don't understand ECMA-164, Page 5 */
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (namelength > 0) {
|
||
|
|
myidx += namelength + 1;
|
||
|
|
*bufds = namelength;
|
||
|
|
return myidx - *idx;
|
||
|
|
} else {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|