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/*
* $Id: dlg.h,v 1.2 2005/11/28 19:47:28 bogdan_iancu Exp $
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of openser, a free SIP server.
*
* openser 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
*
* openser 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:
* -------
* 2003-03-29 Created by janakj
*/
#ifndef DLG_H
#define DLG_H
#include <stdio.h>
#include "../../str.h"
#include "../../parser/parse_rr.h"
#include "../../parser/msg_parser.h"
/*
* Dialog sequence
*/
typedef struct dlg_seq {
unsigned int value; /* Sequence value */
unsigned char is_set; /* is_set flag */
} dlg_seq_t;
/*
* Dialog state
*/
typedef enum dlg_state {
DLG_NEW = 0, /* New dialog, no reply received yet */
DLG_EARLY, /* Early dialog, provisional response received */
DLG_CONFIRMED, /* Confirmed dialog, 2xx received */
DLG_DESTROYED /* Destroyed dialog */
} dlg_state_t;
/*
* Structure describing a dialog identifier
*/
typedef struct dlg_id {
str call_id; /* Call-ID */
str rem_tag; /* Remote tag of the dialog */
str loc_tag; /* Local tag of the dialog */
} dlg_id_t;
/*
* It is necessary to analyze the dialog data to find out
* what URI put into the Record-Route, where the message
* should be really sent and how to construct the route
* set of the message. This structure stores this information
* so we don't have to calculate each time we want to send a
* message within dialog
*/
typedef struct dlg_hooks {
str ru;
str nh;
str* request_uri; /* This should be put into Request-URI */
str* next_hop; /* Where the message should be really sent */
rr_t* first_route; /* First route to be printed into the message */
str* last_route; /* If not zero add this as the last route */
} dlg_hooks_t;
/*
* Structure representing dialog state
*/
typedef struct dlg {
dlg_id_t id; /* Dialog identifier */
dlg_seq_t loc_seq; /* Local sequence number */
dlg_seq_t rem_seq; /* Remote sequence number */
str loc_uri; /* Local URI */
str rem_uri; /* Remote URI */
str rem_target; /* Remote target URI */
unsigned char secure; /* Secure flag -- currently not used */
dlg_state_t state; /* State of the dialog */
rr_t* route_set; /* Route set */
dlg_hooks_t hooks; /* Various hooks used to store information that
* can be reused when building a message (to
* prevent repeated analyzing of the dialog data
*/
struct socket_info* send_sock;
} dlg_t;
/*
* Create a new dialog
*/
int new_dlg_uac(str* _cid, str* _ltag, unsigned int _lseq, str* _luri, str* _ruri, dlg_t** _d);
typedef int (*new_dlg_uac_f)(str* _cid, str* _ltag, unsigned int _lseq, str* _luri, str* _ruri, dlg_t** _d);
/*
* A response arrived, update dialog
*/
int dlg_response_uac(dlg_t* _d, struct sip_msg* _m);
typedef int (*dlg_response_uac_f)(dlg_t* _d, struct sip_msg* _m);
/*
* Establishing a new dialog, UAS side
*/
int new_dlg_uas(struct sip_msg* _req, int _code, /*str* _tag,*/ dlg_t** _d);
typedef int (*new_dlg_uas_f)(struct sip_msg* _req, int _code, dlg_t** _d);
/*
* UAS side - update a dialog from a request
*/
int dlg_request_uas(dlg_t* _d, struct sip_msg* _m);
typedef int (*dlg_request_uas_f)(dlg_t* _d, struct sip_msg* _m);
/*
* Destroy a dialog state
*/
void free_dlg(dlg_t* _d);
typedef void (*free_dlg_f)(dlg_t* _d);
/*
* Print a dialog structure, just for debugging
*/
void print_dlg(FILE* out, dlg_t* _d);
typedef void (*print_dlg_f)(FILE* out, dlg_t* _d);
/*
* Calculate length of the route set
*/
int calculate_routeset_length(dlg_t* _d);
/*
*
* Print the route set
*/
char* print_routeset(char* buf, dlg_t* _d);
/*
* wrapper to calculate_hooks
* added by dcm
*/
int w_calculate_hooks(dlg_t* _d);
#endif /* DLG_H */
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