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/*
* $Id: parse_supported.c,v 1.4 2006/03/02 15:56:12 bogdan_iancu Exp $
*
* Supported parser.
*
* Copyright (C) 2006 Andreas Granig <agranig@linguin.org>
*
* 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 "../mem/mem.h"
#include "keys.h"
#include "parse_supported.h"
#define IS_DELIM(c) (*(c) == ' ' || *(c) == '\t' || *(c) == '\r' || *(c) == '\n' || *(c) == ',')
/* from parser/parse_hname2.c: */
#define LOWER_BYTE(b) ((b) | 0x20)
#define LOWER_DWORD(d) ((d) | 0x20202020)
#define READ(val) \
(*(val + 0) + (*(val + 1) << 8) + (*(val + 2) << 16) + (*(val + 3) << 24))
/*
* Parse Supported HF body.
*/
static inline int parse_supported_body(str *body, unsigned int *sup)
{
register char* p;
register unsigned int val;
int len, pos = 0;
*sup = 0;
p = body->s;
len = body->len;
while (pos < len) {
/* skip spaces and commas */
for (; pos < len && IS_DELIM(p); ++pos, ++p);
val = LOWER_DWORD(READ(p));
switch (val) {
/* "path" */
case _path_:
if(pos + 4 <= len && IS_DELIM(p+4)) {
*sup |= F_SUPPORTED_PATH;
pos += 5; p += 5;
}
break;
/* "100rel" */
case _100r_:
if ( pos+6 <= len
&& LOWER_BYTE(*(p+4))=='e' && LOWER_BYTE(*(p+5))=='l'
&& IS_DELIM(p+6)) {
*sup |= F_SUPPORTED_100REL;
pos += SUPPORTED_100REL_LEN + 1;
p += SUPPORTED_100REL_LEN + 1;
}
break;
/* "timer" */
case _time_:
if ( pos+5 <= len && LOWER_BYTE(*(p+4))=='r'
&& IS_DELIM(p+5) ) {
*sup |= F_SUPPORTED_TIMER;
pos += SUPPORTED_TIMER_LEN + 1;
p += SUPPORTED_TIMER_LEN + 1;
}
break;
/* unknown */
default:
/* skip element */
for (; pos < len && !IS_DELIM(p); ++pos, ++p);
break;
}
}
return 0;
}
/*
* Parse all Supported headers
*/
int parse_supported( struct sip_msg *msg)
{
unsigned int supported;
struct hdr_field *hdr;
struct supported_body *sb;
/* maybe the header is already parsed! */
if (msg->supported && msg->supported->parsed)
return 0;
/* parse to the end in order to get all SUPPORTED headers */
if (parse_headers(msg,HDR_EOH_F,0)==-1 || !msg->supported)
return -1;
/* bad luck! :-( - we have to parse them */
supported = 0;
for( hdr=msg->supported ; hdr ; hdr=hdr->sibling) {
if (hdr->parsed) {
supported |= ((struct supported_body*)hdr->parsed)->supported;
continue;
}
sb = (struct supported_body*)pkg_malloc(sizeof(struct supported_body));
if (sb == 0) {
LOG(L_ERR, "ERROR:parse_supported: Out of pkg_memory\n");
return -1;
}
parse_supported_body(&(hdr->body), &(sb->supported));
sb->supported_all = 0;
hdr->parsed = (void*)sb;
supported |= sb->supported;
}
((struct supported_body*)msg->supported->parsed)->supported_all =
supported;
return 0;
}
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