parse_supported.c

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/*
 * $Id$
 *
 * Copyright (C) 2006 Andreas Granig <agranig@linguin.org>
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio 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
 *
 * Kamailio 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 "../../parser/keys.h"
#include "parse_supported.h"

#define _100r_ 0x72303031   /* "100r" for "100rel" */
#define _time_ 0x656d6974   
#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))


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;

                        /* extra supported or unknown */
                        default:
                                if(pos+SUPPORTED_EVENTLIST_LEN<=len
                                                && strncasecmp(p, SUPPORTED_EVENTLIST_STR,
                                                        SUPPORTED_EVENTLIST_LEN)==0
                                                && IS_DELIM(p+SUPPORTED_EVENTLIST_LEN) ) {
                                        *sup |= F_SUPPORTED_EVENTLIST;
                                        pos += SUPPORTED_EVENTLIST_LEN + 1;
                                        p   += SUPPORTED_EVENTLIST_LEN + 1;
                                } else if(pos+SUPPORTED_GRUU_LEN<=len
                                                && strncasecmp(p, SUPPORTED_GRUU_STR,
                                                        SUPPORTED_GRUU_LEN)==0
                                                && IS_DELIM(p+SUPPORTED_GRUU_LEN)) {
                                        *sup |= F_SUPPORTED_GRUU;
                                        pos += SUPPORTED_GRUU_LEN + 1;
                                        p   += SUPPORTED_GRUU_LEN + 1;
                                } else if(pos+SUPPORTED_OUTBOUND_LEN<=len
                                                && strncasecmp(p, SUPPORTED_OUTBOUND_STR,
                                                        SUPPORTED_OUTBOUND_LEN)==0
                                                && IS_DELIM(p+SUPPORTED_OUTBOUND_LEN)) {
                                        *sup |= F_SUPPORTED_OUTBOUND;
                                        pos += SUPPORTED_OUTBOUND_LEN + 1;
                                        p   += SUPPORTED_OUTBOUND_LEN + 1;
                                } else {
                                        /* skip element */
                                        for (; pos < len && !IS_DELIM(p); ++pos, ++p);
                                }
                                break;
                }
        }
        
        return 0;
}


void hf_free_supported(void *parsed)
{
        struct supported_body *sb;
        sb = (struct supported_body*)parsed;
        free_supported(&sb);
}

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=next_sibling_hdr(hdr)) {
                if (hdr->parsed) {
                        supported |= ((struct supported_body*)hdr->parsed)->supported;
                        continue;
                }

                sb = (struct supported_body*)pkg_malloc(sizeof(struct supported_body));
                if (sb == 0) {
                        LM_ERR("out of pkg_memory\n");
                        return -1;
                }

                parse_supported_body(&(hdr->body), &(sb->supported));
                sb->hfree = hf_free_supported;
                sb->supported_all = 0;
                hdr->parsed = (void*)sb;
                supported |= sb->supported;
        }

        ((struct supported_body*)msg->supported->parsed)->supported_all = 
                supported;
        return 0;
}

/* free supported header structure */
void free_supported(struct supported_body **sb)
{
        if (sb && *sb) {
                pkg_free(*sb);
                *sb = 0;
        }
}