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/*
* $Id: param_parser.c,v 1.1.1.1 2005/06/13 16:47:51 bogdan_iancu Exp $
*
* 32-bit Digest parameter name parser
*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of openser, a free SIP server.
*
* openser 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
*
* openser 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "param_parser.h"
#include "digest_keys.h"
#include "../../trim.h"
#include "../../ut.h"
#define LOWER_BYTE(b) ((b) | 0x20)
#define LOWER_DWORD(d) ((d) | 0x20202020)
/*
* Parse short (less than 4 bytes) parameter names
*/
#define PARSE_SHORT \
switch(LOWER_BYTE(*p)) { \
case 'u': \
if (LOWER_BYTE(*(p + 1)) == 'r') { \
if (LOWER_BYTE(*(p + 2)) == 'i') { \
*_type = PAR_URI; \
p += 3; \
goto end; \
} \
} \
break; \
\
case 'q': \
if (LOWER_BYTE(*(p + 1)) == 'o') { \
if (LOWER_BYTE(*(p + 2)) == 'p') { \
*_type = PAR_QOP; \
p += 3; \
goto end; \
} \
} \
break; \
\
case 'n': \
if (LOWER_BYTE(*(p + 1)) == 'c') { \
*_type = PAR_NC; \
p += 2; \
goto end; \
} \
break; \
}
/*
* Read 4-bytes from memory and store them in an integer variable
* Reading byte by byte ensures, that the code works also on HW which
* does not allow reading 4-bytes at once from unaligned memory position
* (Sparc for example)
*/
#define READ(val) \
(*(val + 0) + (*(val + 1) << 8) + (*(val + 2) << 16) + (*(val + 3) << 24))
#define name_CASE \
switch(LOWER_DWORD(val)) { \
case _name_: \
*_type = PAR_USERNAME; \
p += 4; \
goto end; \
}
#define user_CASE \
p += 4; \
val = READ(p); \
name_CASE; \
goto other;
#define real_CASE \
p += 4; \
if (LOWER_BYTE(*p) == 'm') { \
*_type = PAR_REALM; \
p++; \
goto end; \
}
#define nonc_CASE \
p += 4; \
if (LOWER_BYTE(*p) == 'e') { \
*_type = PAR_NONCE; \
p++; \
goto end; \
}
#define onse_CASE \
switch(LOWER_DWORD(val)) { \
case _onse_: \
*_type = PAR_RESPONSE; \
p += 4; \
goto end; \
}
#define resp_CASE \
p += 4; \
val = READ(p); \
onse_CASE; \
goto other;
#define cnon_CASE \
p += 4; \
if (LOWER_BYTE(*p) == 'c') { \
p++; \
if (LOWER_BYTE(*p) == 'e') { \
*_type = PAR_CNONCE; \
p++; \
goto end; \
} \
} \
goto other;
#define opaq_CASE \
p += 4; \
if (LOWER_BYTE(*p) == 'u') { \
p++; \
if (LOWER_BYTE(*p) == 'e') { \
*_type = PAR_OPAQUE; \
p++; \
goto end; \
} \
} \
goto other;
#define rith_CASE \
switch(LOWER_DWORD(val)) { \
case _rith_: \
p += 4; \
if (LOWER_BYTE(*p) == 'm') { \
*_type = PAR_ALGORITHM; \
p++; \
goto end; \
} \
goto other; \
}
#define algo_CASE \
p += 4; \
val = READ(p); \
rith_CASE; \
goto other
#define FIRST_QUATERNIONS \
case _user_: user_CASE; \
case _real_: real_CASE; \
case _nonc_: nonc_CASE; \
case _resp_: resp_CASE; \
case _cnon_: cnon_CASE; \
case _opaq_: opaq_CASE; \
case _algo_: algo_CASE;
int parse_param_name(str* _s, dig_par_t* _type)
{
register char* p;
register int val;
char* end;
end = _s->s + _s->len;
p = _s->s;
val = READ(p);
if (_s->len < 4) {
goto other;
}
switch(LOWER_DWORD(val)) {
FIRST_QUATERNIONS;
default:
PARSE_SHORT;
goto other;
}
end:
_s->len -= p - _s->s;
_s->s = p;
trim_leading(_s);
if (_s->s[0] == '=') {
return 0;
}
other:
p = q_memchr(p, '=', end - p);
if (!p) {
return -1; /* Parse error */
} else {
*_type = PAR_OTHER;
_s->len -= p - _s->s;
_s->s = p;
return 0;
}
}
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