parser/parse_from.c
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 /*
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  * Copyright (C) 2001-2003 FhG Fokus
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  *
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  * This file is part of Kamailio, a free SIP server.
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  *
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  * Kamailio is free software; you can redistribute it and/or modify
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  * 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
  *
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  * Kamailio is distributed in the hope that it will be useful,
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  * 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 
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  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
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  */
 
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 /*! \file
  * \brief Parser :: SIP From header parsing
  *
  * \ingroup parser
  */
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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"
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 #include "parse_uri.h"
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 #include "../ut.h"
 #include "../mem/mem.h"
 
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 /*! \brief
  * This method is used to parse the from header.
  *
  * \note It was decided not to parse
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  * 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_F,0)==-1 || !msg->from)) {
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 		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 [%.*s]\n",
 				msg->from->body.len, msg->from->body.s);
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 		free_to(from_b);
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 		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;
 }
 
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 sip_uri_t *parse_from_uri(sip_msg_t *msg)
 {
 	to_body_t *tb = NULL;
         
 	if(msg==NULL)
 		return NULL;
 
 	if(parse_from_header(msg)<0)
 	{
 		LM_ERR("cannot parse FROM header\n");
 		return NULL;
 	}
 	
 	if(msg->from==NULL || get_from(msg)==NULL)
 		return NULL;
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 	tb = get_from(msg);
 	
 	if(tb->parsed_uri.user.s!=NULL || tb->parsed_uri.host.s!=NULL)
 		return &tb->parsed_uri;
 	
 	if (parse_uri(tb->uri.s, tb->uri.len , &tb->parsed_uri)<0)
 	{
 		LM_ERR("failed to parse From uri\n");
 		memset(&tb->parsed_uri, 0, sizeof(struct sip_uri));
 		return NULL;
 	}
 	return &tb->parsed_uri;
 }