/*
 * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
 * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
 *
 * This program 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.
 *
 * This program 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
 */
#ifndef __PJ_IP_ROUTE_H__
#define __PJ_IP_ROUTE_H__

/**
 * @file ip_helper.h
 * @brief IP helper API
 */

#include <pj/sock.h>
#include <pj/string.h>

PJ_BEGIN_DECL

/**
 * @defgroup pj_ip_helper IP Interface and Routing Helper
 * @ingroup PJ_IO
 * @{
 *
 * This module provides functions to query local host's IP interface and
 * routing table.
 */

/**
 * This structure describes IP routing entry.
 */
typedef union pj_ip_route_entry {
    /** IP routing entry for IP version 4 routing */
    struct {
        pj_in_addr if_addr;  /**< Local interface IP address.    */
        pj_in_addr dst_addr; /**< Destination IP address.        */
        pj_in_addr mask;     /**< Destination mask.              */
    } ipv4;
} pj_ip_route_entry;

/**
 * This structure describes options for pj_enum_ip_interface2().
 */
typedef struct pj_enum_ip_option {
    /**
     * Family of the address to be retrieved. Application may specify
     * pj_AF_UNSPEC() to retrieve all addresses, or pj_AF_INET() or
     * pj_AF_INET6() to retrieve interfaces with specific address family.
     *
     * Default: pj_AF_UNSPEC().
     */
    int af;

    /**
     * IPv6 addresses can have a DEPRECATED flag, if this flag is set, any
     * DEPRECATED IPv6 address will be omitted. Currently this is only
     * available for Linux, on other platforms, if this flag is set,
     * pj_enum_ip_interface2() will return PJ_ENOTSUP.
     *
     * Default: PJ_FALSE.
     */
    pj_bool_t omit_deprecated_ipv6;

} pj_enum_ip_option;

/**
 * Get default values of IP enumeration option.
 *
 * @param opt       The IP enumeration option.
 */
PJ_INLINE(void) pj_enum_ip_option_default(pj_enum_ip_option *opt)
{
    pj_bzero(opt, sizeof(*opt));
}

/**
 * Enumerate the local IP interfaces currently active in the host.
 *
 * @param af        Family of the address to be retrieved. Application
 *                  may specify pj_AF_UNSPEC() to retrieve all addresses,
 *                  or pj_AF_INET() or pj_AF_INET6() to retrieve interfaces
 *                  with specific address family.
 * @param count     On input, specify the number of entries. On output,
 *                  it will be filled with the actual number of entries.
 * @param ifs       Array of socket addresses, which address part will
 *                  be filled with the interface address. The address
 *                  family part will be initialized with the address
 *                  family of the IP address.
 *
 * @return          PJ_SUCCESS on success, or the appropriate error code.
 */
PJ_DECL(pj_status_t) pj_enum_ip_interface(int af, unsigned *count, pj_sockaddr ifs[]);

/**
 * Enumerate the local IP interfaces currently active in the host with
 * capability to filter DEPRECATED IPv6 addresses (currently only for Linux).
 *
 * @param opt       The option, default option will be used if NULL.
 * @param count     On input, specify the number of entries. On output,
 *                  it will be filled with the actual number of entries.
 * @param ifs       Array of socket (with flags) addresses, which address part
 *                  will be filled with the interface address. The address
 *                  family part will be initialized with the address
 *                  family of the IP address.
 *
 * @return          PJ_SUCCESS on success, or the appropriate error code.
 */
PJ_DECL(pj_status_t) pj_enum_ip_interface2(const pj_enum_ip_option *opt, unsigned *count, pj_sockaddr ifs[]);

/**
 * Enumerate the IP routing table for this host.
 *
 * @param count     On input, specify the number of routes entries. On output,
 *                  it will be filled with the actual number of route entries.
 * @param routes    Array of IP routing entries.
 *
 * @return          PJ_SUCCESS on success, or the appropriate error code.
 */
PJ_DECL(pj_status_t) pj_enum_ip_route(unsigned *count, pj_ip_route_entry routes[]);

/** @} */

PJ_END_DECL

#endif /* __PJ_IP_ROUTE_H__ */