/*
 * $Id$
 *
 * Copyright (C) 2001-2004 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
 *
 * 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
 */

/*!
 * \file
 * \brief SIP-router core :: Destination set handling
 * \ingroup core
 * Module: \ref core
 */

#ifndef _DSET_H
#define _DSET_H

#include "ip_addr.h"
#include "qvalue.h"
#include "flags.h"
#include "parser/msg_parser.h"


extern unsigned int nr_branches;
extern int ruri_is_new;

/*! \brief
 * Structure for storing branch attributes
 */
struct branch
{
    char uri[MAX_URI_SIZE];
    unsigned int len;

         /* Real destination of the request */
    char dst_uri[MAX_URI_SIZE];
    unsigned int dst_uri_len;

    /* Path set */
    char path[MAX_PATH_SIZE];
    unsigned int path_len;

    int q; /* Preference of the contact among
        * contact within the array */
    struct socket_info* force_send_socket;

    /* +sip.instance contact header param value */
    char instance[MAX_INSTANCE_SIZE];
    unsigned int instance_len;

    /* reg-id contact header param value */
    unsigned int reg_id;

    /* Branch flags */
    flag_t flags;
};

typedef struct branch branch_t;

/*! \brief
 * Return pointer to branch[idx] structure
 */
branch_t *get_sip_branch(int idx);

/*! \brief
 * Drop branch[idx]
 */
int drop_sip_branch(int idx);

/*! \brief
 * Add a new branch to current transaction 
 */
int append_branch(struct sip_msg* msg, str* uri, str* dst_uri, str* path,
		  qvalue_t q, unsigned int flags,
		  struct socket_info* force_socket,
		  str* instance, unsigned int reg_id);

/*! \brief kamailio compatible version */
#define km_append_branch(msg, uri, dst_uri, path, q, flags, force_socket) \
    append_branch(msg, uri, dst_uri, path, q, flags, force_socket, 0, 0)

/*! \brief ser compatible append_branch version.
 *  append_branch version compatible with ser: no path or branch flags support
 *  and no str parameters.
 */
static inline int ser_append_branch(struct sip_msg* msg,
				    char* uri, int uri_len,
				    char* dst_uri, int dst_uri_len,
				    qvalue_t q,
				    struct socket_info* force_socket)
{
    str s_uri, s_dst_uri;
    s_uri.s=uri;
    s_uri.len=uri_len;
    s_dst_uri.s=dst_uri;
    s_dst_uri.len=dst_uri_len;
    return append_branch(msg, &s_uri, &s_dst_uri, 0, q, 0, force_socket, 0, 0);
}



/*! \brief
 * Init the index to iterate through the list of transaction branches
 */
void init_branch_iterator(void);

/*! \brief
 * Return branch iterator position
 */
int get_branch_iterator(void);

/*! \brief
 * Set branch iterator position
 */
void set_branch_iterator(int n);

/*! \brief Get the next branch in the current transaction.
 * @return pointer to the uri of the next branch (which the length written in
 *  *len) or 0 if there are no more branches.
 */
char* next_branch(int* len, qvalue_t* q, str* dst_uri, str* path,
		  unsigned int* flags, struct socket_info** force_socket);

char* get_branch( unsigned int i, int* len, qvalue_t* q, str* dst_uri,
		  str* path, unsigned int *flags,
		  struct socket_info** force_socket);

/*! \brief
 * Empty the array of branches
 */
void clear_branches(void);


/*! \brief
 * Create a Contact header field from the
 * list of current branches
 */
char* print_dset(struct sip_msg* msg, int* len);


/*! \brief
 * Set the q value of the Request-URI
 */
void set_ruri_q(qvalue_t q);


/*! \brief
 * Get the q value of the Request-URI
 */
qvalue_t get_ruri_q(void);



/*
 * Get actual Request-URI
 */
inline static int get_request_uri(struct sip_msg* _m, str* _u)
{
	*_u=*GET_RURI(_m);
	return 0;
}


#define ruri_mark_new() (ruri_is_new = 1)

#define ruri_mark_consumed()  (ruri_is_new = 0)

/** returns whether or not ruri should be used when forking.
  * (usefull for serial forking)
  * @return 0 if already marked as consumed, 1 if not.
 */
#define ruri_get_forking_state() (ruri_is_new)

int rewrite_uri(struct sip_msg* _m, str* _s);

/*! \brief
 * Set a per-branch flag to 1.
 *
 * This function sets the value of one particular branch flag to 1.
 * @param branch Number of the branch (0 for the main Request-URI branch)
 * @param flag Number of the flag to be set (starting with 0)
 * @return 1 on success, -1 on failure.
 */
int setbflag(unsigned int branch, flag_t flag);

/*! \brief
 * Reset a per-branch flag value to 0.
 *
 * This function resets the value of one particular branch flag to 0.
 * @param branch Number of the branch (0 for the main Request-URI branch)
 * @param flag Number of the flag to be reset (starting with 0)
 * @return 1 on success, -1 on failure.
 */
int resetbflag(unsigned int branch, flag_t flag);

/*! \brief
 * Determine if a branch flag is set.
 *
 * This function tests the value of one particular per-branch flag.
 * @param branch Number of the branch (0 for the main Request-URI branch)
 * @param flag Number of the flag to be tested (starting with 0)
 * @return 1 if the branch flag is set, -1 if not or on failure.
 */
int isbflagset(unsigned int branch, flag_t flag);

/*! \brief
 * Get the value of all branch flags for a branch
 *
 * This function returns the value of all branch flags
 * combined in a single variable.
 * @param branch Number of the branch (0 for the main Request-URI branch)
 * @param res A pointer to a variable to store the result
 * @return 1 on success, -1 on failure
 */
int getbflagsval(unsigned int branch, flag_t* res);

/*! \brief
 * Set the value of all branch flags at once for a given branch.
 *
 * This function sets the value of all branch flags for a given
 * branch at once.
 * @param branch Number of the branch (0 for the main Request-URI branch)
 * @param val All branch flags combined into a single variable
 * @return 1 on success, -1 on failure
 */
int setbflagsval(unsigned int branch, flag_t val);

#endif /* _DSET_H */