/* OpenIDA - Outil d'analyse de fichiers binaires
 * core.c - prototypes pour les informations de base pour tout élément ajouté
 *
 * Copyright (C) 2014 Cyrille Bagard
 *
 *  This file is part of OpenIDA.
 *
 *  OpenIDA 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  OpenIDA 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 Foobar.  If not, see <http://www.gnu.org/licenses/>.
 */


#include "core.h"


#include <endian.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>


#include "../../common/io.h"



/******************************************************************************
*                                                                             *
*  Paramètres  : -                                                            *
*                                                                             *
*  Description : Détermine une fois pour toute la désignation de l'usager.    *
*                                                                             *
*  Retour      : Nom statique déterminé.                                      *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

const char *get_local_author_name(void)
{
    static char result[MAX_DB_AUTHOR_LEN];  /* Désignation à retourner     */
    char *chrysalide_user;                  /* Eventuel nom spécifique     */
    char *logname;                          /* Nom depuis l'environnement  */
    char hostname[HOST_NAME_MAX];           /* Nom de la machine courante  */
    int ret;                                /* Bilan d'un appel            */

    if (result[0] == '\0')
    {
        chrysalide_user = getenv("CHRYSALIDE_USER");

        if (chrysalide_user != NULL)
        {
            strncpy(result, chrysalide_user, MAX_DB_AUTHOR_LEN - 1);
            result[MAX_DB_AUTHOR_LEN - 1] = '\0';
        }
        else
        {
            logname = getenv("LOGNAME");
            if (logname == NULL)
                logname = "";

            ret = gethostname(hostname, HOST_NAME_MAX);
            if (ret != 0)
                hostname[0] = '\0';

            if (logname != NULL && hostname[0] != '\0')
                snprintf(result, MAX_DB_AUTHOR_LEN, "%s@%s", logname, hostname);

            else if (logname != NULL && hostname[0] == '\0')
                snprintf(result, MAX_DB_AUTHOR_LEN, "%s", logname);

            else if (logname == NULL && hostname[0] != '\0')
                snprintf(result, MAX_DB_AUTHOR_LEN, "@%s", hostname);

            else
                snprintf(result, MAX_DB_AUTHOR_LEN, "anonymous");

        }

    }

    return result;

}


/******************************************************************************
*                                                                             *
*  Paramètres  : info = informations à constituer. [OUT]                      *
*                type = type de l'élément à mettre en place.                  *
*                user = provenance des informations ou NULL si machine.       *
*                                                                             *
*  Description : Initialise le coeur des informations d'un élément ajouté.    *
*                                                                             *
*  Retour      : -                                                            *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

void init_core_db_info(core_db_info *info, uint64_t type, const char *user)
{
    info->type = type;

    strncpy(info->user, user, MAX_DB_AUTHOR_LEN - 1);
    info->user[MAX_DB_AUTHOR_LEN - 1] = '\0';

    info->created = time(NULL);
    info->modified = info->created;

    info->saved = 0;

}


/******************************************************************************
*                                                                             *
*  Paramètres  : info = informations à constituer. [OUT]                      *
*                type = type de l'élément, lu en avance de phase.             *
*                fd   = flux ouvert en lecture pour l'importation.            *
*                                                                             *
*  Description : Importe le coeur des informations d'un élément ajouté.       *
*                                                                             *
*  Retour      : Bilan de l'opération.                                        *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

bool load_core_db_info(core_db_info *info, uint64_t type, int fd)
{
    ssize_t got;                            /* Quantité de données reçues  */
    uint64_t val64;                         /* Valeur sur 64 bits          */

    info->type = type;

    got = safe_recv(fd, info->user, MAX_DB_AUTHOR_LEN, MSG_WAITALL);
    if (got != MAX_DB_AUTHOR_LEN) return false;

    info->user[MAX_DB_AUTHOR_LEN - 1] = '\0';

    got = safe_recv(fd, &val64, sizeof(uint64_t), MSG_WAITALL);
    if (got != sizeof(uint64_t)) return false;

    info->created = be64toh(val64);

    got = safe_recv(fd, &val64, sizeof(uint64_t), MSG_WAITALL);
    if (got != sizeof(uint64_t)) return false;

    info->modified = be64toh(val64);

    info->saved = info->modified;

    return true;

}


/******************************************************************************
*                                                                             *
*  Paramètres  : info = informations à sauvegarer.                            *
*                fd   = flux ouvert en écriture pour l'exportation.           *
*                                                                             *
*  Description : Exporte le coeur des informations d'un élément ajouté.       *
*                                                                             *
*  Retour      : Bilan de l'opération.                                        *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

bool store_core_db_info(core_db_info *info, int fd)
{
    ssize_t got;                            /* Quantité de données reçues  */

    got = safe_send(fd, (uint64_t []) { htobe64(info->type) }, sizeof(uint64_t), MSG_WAITALL);
    if (got != sizeof(uint64_t)) return false;

    got = safe_send(fd, info->user, MAX_DB_AUTHOR_LEN, MSG_WAITALL);
    if (got != MAX_DB_AUTHOR_LEN) return false;

    got = safe_send(fd, (uint64_t []) { htobe64(info->created) }, sizeof(uint64_t), MSG_WAITALL);
    if (got != sizeof(uint64_t)) return false;

    got = safe_send(fd, (uint64_t []) { htobe64(info->modified) }, sizeof(uint64_t), MSG_WAITALL);
    if (got != sizeof(uint64_t)) return false;

    info->saved = time(NULL);

    return true;

}