parse_hname2.c

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/*
 * $Id$
 *
 * Fast 32-bit Header Field Name Parser
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of ser, a free SIP server.
 *
 * ser 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
 *
 * For a license to use the ser software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact iptel.org by e-mail at the following addresses:
 *    info@iptel.org
 *
 * ser 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
 *
 * History:
 * --------
 * 2003-02-28 scratchpad compatibility abandoned (jiri)
 * 2003-01-27 next baby-step to removing ZT - PRESERVE_ZT (jiri)
 * 2003-05-01 added support for Accept HF (janakj)
 * 2007-01-26 Date, Identity, Identity_info HF support added (gergo)
 * 2007-07-27 added support for Retry-After (andrei)
 */

#include "../comp_defs.h"
#include "parse_hname2.h"
#include "keys.h"
#include "../ut.h"  /* q_memchr */

#define LOWER_BYTE(b) ((b) | 0x20)
#define LOWER_DWORD(d) ((d) | 0x20202020)

static inline char* skip_ws(char* p, unsigned int size)
{
        char* end;

        end = p + size;
        for(; p < end; p++) {
                if ((*p != ' ') && (*p != '\t')) return p;
        }
        return p;
}


#include "case_via.h"      /* Via */
#include "case_from.h"     /* From */
#include "case_to.h"       /* To */
#include "case_cseq.h"     /* CSeq */
#include "case_call.h"     /* Call-ID */
#include "case_cont.h"     /* Contact, Content-Type, Content-Length, Content-Purpose,
                            * Content-Action, Content-Disposition */
#include "case_rout.h"     /* Route */
#include "case_max.h"      /* Max-Forwards */
#include "case_reco.h"     /* Record-Route */
#include "case_auth.h"     /* Authorization */
#include "case_expi.h"     /* Expires */
#include "case_prox.h"     /* Proxy-Authorization, Proxy-Require */
#include "case_allo.h"     /* Allow */
#include "case_unsu.h"     /* Unsupported */
#include "case_even.h"     /* Event */
#include "case_sip.h"      /* Sip-If-Match */
#include "case_acce.h"     /* Accept, Accept-Language */
#include "case_orga.h"     /* Organization */
#include "case_prio.h"     /* Priority */
#include "case_subj.h"     /* Subject */
#include "case_user.h"     /* User-Agent */
#include "case_serv.h"     /* Server */
#include "case_supp.h"     /* Supported */
#include "case_dive.h"     /* Diversion */
#include "case_remo.h"     /* Remote-Party-ID */
#include "case_refe.h"     /* Refer-To */
#include "case_sess.h"     /* Session-Expires */
#include "case_reje.h"     /* Reject-Contact */
#include "case_min.h"      /* Min-SE */
#include "case_subs.h"     /* Subscription-State */
#include "case_requ.h"     /* Require */
#include "case_www.h"      /* WWW-Authenticate */
#include "case_date.h"     /* Date */
#include "case_iden.h"     /* Identity, Identity-info */
#include "case_retr.h"     /* Retry-After */
#include "case_path.h"     /* Path */
#include "case_priv.h"
#include "case_reas.h"     /* Reason */
#include "case_p_as.h"     /* P-Asserted-Identity */
#include "case_p_pr.h"     /* P-Preferred-Identity */

#define READ(val) \
(*(val + 0) + (*(val + 1) << 8) + (*(val + 2) << 16) + (*(val + 3) << 24))

#define READ3(val) \
(*(val + 0) + (*(val + 1) << 8) + (*(val + 2) << 16))

#define FIRST_QUATERNIONS       \
        case _via1_: via1_CASE; \
        case _from_: from_CASE; \
        case _to12_: to12_CASE; \
        case _cseq_: cseq_CASE; \
        case _call_: call_CASE; \
        case _cont_: cont_CASE; \
        case _rout_: rout_CASE; \
        case _max__: max_CASE;  \
        case _reco_: reco_CASE; \
        case _via2_: via2_CASE; \
        case _auth_: auth_CASE; \
        case _supp_: supp_CASE; \
        case _expi_: expi_CASE; \
        case _prox_: prox_CASE; \
        case _allo_: allo_CASE; \
        case _unsu_: unsu_CASE; \
        case _even_: even_CASE; \
        case _sip_ : sip_CASE;  \
        case _acce_: acce_CASE; \
        case _orga_: orga_CASE; \
        case _prio_: prio_CASE; \
        case _subj_: subj_CASE; \
        case _subs_: subs_CASE; \
        case _user_: user_CASE; \
        case _serv_: serv_CASE; \
        case _dive_: dive_CASE; \
        case _remo_: remo_CASE; \
        case _refe_: refe_CASE; \
        case _sess_: sess_CASE; \
        case _reje_: reje_CASE; \
        case _min__: min_CASE;  \
        case _requ_: requ_CASE;  \
        case _www__: www_CASE; \
        case _date_: date_CASE; \
        case _iden_: iden_CASE; \
        case _retr_: retr_CASE; \
        case _path_: path_CASE; \
        case _priv_: priv_CASE; \
        case _reas_: reas_CASE; \
        case _p_as_: p_as_CASE; \
        case _p_pr_: p_pr_CASE;


#define PARSE_COMPACT(id)          \
        switch(*(p + 1)) {         \
        case ' ':                  \
                hdr->type = id;    \
                p += 2;            \
                goto dc_end;       \
                                   \
        case ':':                  \
                hdr->type = id;    \
                hdr->name.len = 1; \
                return (p + 2);    \
        }

#if 0
int hdr_update_type(struct hdr_field* hdr)
{
        if(hdr==0 || hdr->name.s==0)
                return -1;
        switch(hdr->name.len) {
                case 19:
                        if(strncasecmp(hdr->name.s, "P-Asserted-Identity", 19)==0)
                                hdr->type = HDR_PAI_T;
                break;
                case 20:
                        if(strncasecmp(hdr->name.s, "P-Preferred-Identity", 20)==0)
                                hdr->type = HDR_PPI_T;
                break;
        }

        return 0;
}
#endif

char* parse_hname2(char* begin, char* end, struct hdr_field* hdr)
{
        register char* p;
        register unsigned int val;

        if ((end - begin) < 4) {
                hdr->type = HDR_ERROR_T;
                return begin;
        }

        p = begin;

        val = LOWER_DWORD(READ(p));
        hdr->name.s = begin;

        switch(val) {
        FIRST_QUATERNIONS;

        default:
                switch(LOWER_BYTE(*p)) {
                case 't':
                        switch(LOWER_BYTE(*(p + 1))) {
                        case 'o':
                        case ' ':
                                hdr->type = HDR_TO_T;
                                p += 2;
                                goto dc_end;

                        case ':':
                                hdr->type = HDR_TO_T;
                                hdr->name.len = 1;
                                return (p + 2);
                        }
                        break;

                case 'v': PARSE_COMPACT(HDR_VIA_T);           break;
                case 'f': PARSE_COMPACT(HDR_FROM_T);          break;
                case 'i': PARSE_COMPACT(HDR_CALLID_T);        break;
                case 'm': PARSE_COMPACT(HDR_CONTACT_T);       break;
                case 'l': PARSE_COMPACT(HDR_CONTENTLENGTH_T); break;
                case 'k': PARSE_COMPACT(HDR_SUPPORTED_T);     break;
                case 'c': PARSE_COMPACT(HDR_CONTENTTYPE_T);   break;
                case 'o': PARSE_COMPACT(HDR_EVENT_T);         break;
                case 'x': PARSE_COMPACT(HDR_SESSIONEXPIRES_T);break;
                case 'a': PARSE_COMPACT(HDR_ACCEPTCONTACT_T); break;
                case 'u': PARSE_COMPACT(HDR_ALLOWEVENTS_T);   break;
                case 'e': PARSE_COMPACT(HDR_CONTENTENCODING_T); break;
                case 'b': PARSE_COMPACT(HDR_REFERREDBY_T);    break;
                case 'j': PARSE_COMPACT(HDR_REJECTCONTACT_T); break;
                case 'd': PARSE_COMPACT(HDR_REQUESTDISPOSITION_T); break;
                case 's': PARSE_COMPACT(HDR_SUBJECT_T);       break;
                case 'r': PARSE_COMPACT(HDR_REFER_TO_T);      break;
                case 'y': PARSE_COMPACT(HDR_IDENTITY_T);      break;
                case 'n': PARSE_COMPACT(HDR_IDENTITY_INFO_T); break;
                }
                goto other;
        }

             /* Double colon hasn't been found yet */
 dc_end:
        p = skip_ws(p, end - p);
        if (*p != ':') {
                goto other;
        } else {
                hdr->name.len = p - hdr->name.s;
                return (p + 1);
        }

             /* Unknown header type */
 other:
        p = q_memchr(p, ':', end - p);
        if (!p) {        /* No double colon found, error.. */
                hdr->type = HDR_ERROR_T;
                hdr->name.s = 0;
                hdr->name.len = 0;
                return 0;
        } else {
                hdr->type = HDR_OTHER_T;
                hdr->name.len = p - hdr->name.s;
                /*hdr_update_type(hdr);*/
                return (p + 1);
        }
}