registrar/path.c

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/*
 * $Id$
 *
 * Helper functions for Path support.
 *
 * 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 "../../data_lump.h"
#include "../../parser/parse_rr.h"
#include "../../parser/parse_uri.h"
#include "path.h"
#include "reg_mod.h"

int build_path_vector(struct sip_msg *_m, str *path, str *received)
{
        static char buf[MAX_PATH_SIZE];
        char *p;
        struct hdr_field *hdr;
        struct sip_uri puri;

        rr_t *route = 0;

        path->len = 0;
        path->s = 0;
        received->s = 0;
        received->len = 0;

        if(parse_headers(_m, HDR_EOH_F, 0) < 0) {
                LM_ERR("failed to parse the message\n");
                goto error;
        }

        for( hdr=_m->path,p=buf ; hdr ; hdr = next_sibling_hdr(hdr)) {
                /* check for max. Path length */
                if( p-buf+hdr->body.len+1 >= MAX_PATH_SIZE) {
                        LM_ERR("Overall Path body exceeds max. length of %d\n",
                                        MAX_PATH_SIZE);
                        goto error;
                }
                if(p!=buf)
                        *(p++) = ',';
                memcpy( p, hdr->body.s, hdr->body.len);
                p +=  hdr->body.len;
        }

        if (p!=buf) {
                /* check if next hop is a loose router */
                if (parse_rr_body( buf, p-buf, &route) < 0) {
                        LM_ERR("failed to parse Path body, no head found\n");
                        goto error;
                }
                if (parse_uri(route->nameaddr.uri.s,route->nameaddr.uri.len,&puri)<0){
                        LM_ERR("failed to parse the first Path URI\n");
                        goto error;
                }
                if (!puri.lr.s) {
                        LM_ERR("first Path URI is not a loose-router, not supported\n");
                        goto error;
                }
                if (path_use_params) {
                        param_hooks_t hooks;
                        param_t *params;

                        if (parse_params(&(puri.params),CLASS_CONTACT,&hooks,&params)!=0){
                                LM_ERR("failed to parse parameters of first hop\n");
                                goto error;
                        }
                        if (hooks.contact.received)
                                *received = hooks.contact.received->body;
                        /*for (;params; params = params->next) {
                                if (params->type == P_RECEIVED) {
                                        *received = hooks.contact.received->body;
                                        break;
                                }
                        }*/
                        free_params(params);
                }
                free_rr(&route);
        }

        path->s = buf;
        path->len = p-buf;
        return 0;
error:
        if(route) free_rr(&route);
        return -1;
}