parser/parse_from.c
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 /*
  * $Id$
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  *
  * 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
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  */
 
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 #include "parse_from.h"
 #include "parse_to.h"
 #include <stdlib.h>
 #include <string.h>
 #include "../dprint.h"
 #include "msg_parser.h"
 #include "../ut.h"
 #include "../mem/mem.h"
 
 /*
  * This method is used to parse the from header. It was decided not to parse
  * anything in core that is not *needed* so this method gets called by 
  * rad_acc module and any other modules that needs the FROM header.
  *
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  * params: msg : sip msg
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  * returns 0 on success,
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  *        -1 on failure.
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  */
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 int parse_from_header( struct sip_msg *msg)
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 {
 	struct to_body* from_b;
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 	if ( !msg->from && ( parse_headers(msg,HDR_FROM,0)==-1 || !msg->from)) {
 		LOG(L_ERR,"ERROR:parse_from_header: bad msg or missing FROM header\n");
 		goto error;
 	}
 
 	/* maybe the header is already parsed! */
 	if (msg->from->parsed)
 		return 0;
 
 	/* bad luck! :-( - we have to parse it */
 	/* first, get some memory */
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 	from_b = pkg_malloc(sizeof(struct to_body));
 	if (from_b == 0) {
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 		LOG(L_ERR, "ERROR:parse_from_header: out of pkg_memory\n");
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 		goto error;
 	}
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 	/* now parse it!! */
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 	memset(from_b, 0, sizeof(struct to_body));
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 	parse_to(msg->from->body.s,msg->from->body.s+msg->from->body.len+1,from_b);
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 	if (from_b->error == PARSE_ERROR) {
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 		LOG(L_ERR, "ERROR:parse_from_header: bad from header\n");
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 		pkg_free(from_b);
 		goto error;
 	}
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 	msg->from->parsed = from_b;
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 	return 0;
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 error:
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 	return -1;
 }