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path: root/cleopatre/devkit/plcd/src/plcd_main.c
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/* SPC300 bundle {{{
 *
 * Copyright (C) 2010 Spidcom
 *
 * <<<Licence>>>
 *
 * }}} */
/**
 * \file    devkit/plcd/src/plcd_main.c
 * \brief   PLC daemon for AV / EoC stack management
 * \ingroup plcd
 *
 * This PLC daemon is responsible for the initialization of
 * the AV / EoC stack: start, parameter sending, status watching.
 * It is also responsible for any configuration change from
 * the ethernet / plc sides through MME-s.
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <syslog.h>
#include <sys/types.h>
#include <unistd.h> /* for getpid() */

#include "libmme.h"
#include "libspid.h"
#include "plcd.h"

#ifdef __UTESTS__
#  include "plcd_utests.h"
#endif /* __UTESTS__ */


static spc300_nvram_t g_nvram;

volatile sig_atomic_t is_process_signal_needed;


/******************************************************************************/
/* DEBUG FUNCTION                                                             */
/******************************************************************************/

/**
 * Print help for plcd usage.
 *
 * \param  cmd  command
 */
static void
plcd_print_usage (const char *cmd)
{
    fprintf (stderr, "Usage : %s " \
             "[ -c --conf_file hpav_conf_file ]" \
             "[ -i --info_file hpav_info_file ]" \
             "[ -v --version show version number ]\n",
             cmd);
}


/******************************************************************************/
/* SIGNAL HANDLER FOR THIS PROCESS                                            */
/******************************************************************************/

/**
 * Handle signals reception.
 *
 * \param  signal_nb  signal identifier
 */
void
plcd_signal_handler (int signal_nb)
{
    /* check that we received a SIGHUP signal (other signals must be ignored) */
    if (SIGHUP == signal_nb)
    {
        is_process_signal_needed = 1;
    }
}


/******************************************************************************/
/* (UN)INITIALIZATION FUNCTIONS                                               */
/******************************************************************************/

/**
 * Initialize PLC daemon.
 *
 * \param  ctx  plcd context
 * \return -1 on error, 0 otherwise
 */
int
plcd_init (plcd_ctx_t *ctx)
{
    char is_cco_preferred_str[LIBSPID_BOOLEAN_STR_MAX_LEN] = {0};
    char was_cco_str[LIBSPID_BOOLEAN_STR_MAX_LEN] = {0};

    PLCD_ASSERT (NULL != ctx);

    is_process_signal_needed = 0;
    memset (ctx, 0, sizeof (plcd_ctx_t));
    ctx->hpav_info_path = LIBSPID_HPAV_INFO_PATH;
    ctx->hpav_conf_path = LIBSPID_HPAV_CONF_PATH;
    ctx->internal_conf_path = LIBSPID_INTERNAL_CONF_PATH;

    /* create an empty hpav.info file for writing default values */
    if ((LIBSPID_SUCCESS != libspid_config_write_item (ctx->hpav_info_path,
        LIBSPID_HPAV_INFO_LABEL_STATUS, LIBSPID_HPAV_INFO_VALUE_STATUS_UNASSOCIATED))
        || (LIBSPID_SUCCESS != libspid_config_write_item (ctx->hpav_info_path,
        LIBSPID_HPAV_INFO_LABEL_CCO, LIBSPID_HPAV_INFO_VALUE_CCO_STATION))
        || (LIBSPID_SUCCESS != libspid_config_write_item (ctx->hpav_info_path,
        LIBSPID_HPAV_INFO_LABEL_BACKUP_CCO, LIBSPID_VALUE_BOOLEAN_FALSE))
        || (LIBSPID_SUCCESS != libspid_config_write_item (ctx->hpav_info_path,
        LIBSPID_HPAV_INFO_LABEL_SC, LIBSPID_VALUE_BOOLEAN_FALSE))
        || (LIBSPID_SUCCESS != libspid_config_write_item (ctx->hpav_info_path,
        LIBSPID_HPAV_INFO_LABEL_SC_BUTTON, LIBSPID_VALUE_BOOLEAN_FALSE)))
    {
        syslog (LOG_WARNING, "libspid config write item failed");
        return -1;
    }

    /* save these values into PLCD context */
    strcpy (ctx->hpav_info.status, LIBSPID_HPAV_INFO_VALUE_STATUS_UNASSOCIATED);
    strcpy (ctx->hpav_info.cco, LIBSPID_HPAV_INFO_VALUE_CCO_STATION);
    ctx->hpav_info.is_backup_cco = LIBSPID_FALSE;
    ctx->hpav_info.is_sc = LIBSPID_FALSE;
    ctx->hpav_info.is_sc_button = LIBSPID_FALSE;

    /* open netlink socket */
    if (0 > (ctx->plc_sock = socket (PF_NETLINK, SOCK_RAW, NETLINK_PLC_DRV)))
    {
        syslog (LOG_WARNING, "socket open failed");
        return -1;
    }
    memset (&ctx->plcd_addr, 0, sizeof (ctx->plcd_addr));
    ctx->plcd_addr.nl_family = AF_NETLINK;
    ctx->plcd_addr.nl_pid = getpid(); /* self pid */
    ctx->plcd_addr.nl_groups = 0; /* not in mcast group */
    if (0 > bind (ctx->plc_sock, (struct sockaddr *) &ctx->plcd_addr,
                  sizeof (ctx->plcd_addr)))
    {
        syslog (LOG_WARNING, "socket bind failed");
        return -1;
    }

    /* get NVRAM data */
    ctx->nvram = &g_nvram;
#ifdef __UTESTS__
    if (LIBSPID_SUCCESS != utests_libspid_system_get_nvram (ctx->nvram))
#else
    if (LIBSPID_SUCCESS != libspid_system_get_nvram (ctx->nvram))
#endif /* __UTESTS__ */
    {
        syslog (LOG_WARNING, "libspid system get nvram failed");
        return -1;
    }

    /* read and save hpav.conf file contents */
    if ((LIBSPID_SUCCESS != libspid_config_read_item (ctx->hpav_conf_path,
        LIBSPID_HPAV_CONF_LABEL_CCO_PREFERRED, is_cco_preferred_str,
        LIBSPID_BOOLEAN_STR_MAX_LEN))
        || (LIBSPID_SUCCESS != libspid_config_read_item (ctx->hpav_conf_path,
        LIBSPID_HPAV_CONF_LABEL_WAS_CCO, was_cco_str, LIBSPID_BOOLEAN_STR_MAX_LEN))
        || (LIBSPID_SUCCESS != libspid_config_read_item (ctx->hpav_conf_path,
        LIBSPID_HPAV_CONF_LABEL_NMK, ctx->hpav_conf.nmk_str,
        LIBSPID_HPAV_CONF_NMK_STR_LEN))
        || (LIBSPID_SUCCESS != libspid_config_read_item (ctx->hpav_conf_path,
        LIBSPID_HPAV_CONF_LABEL_NID, ctx->hpav_conf.nid_str,
        LIBSPID_HPAV_CONF_NID_STR_LEN))
        || (LIBSPID_SUCCESS != libspid_config_read_item (ctx->hpav_conf_path,
        LIBSPID_HPAV_CONF_LABEL_SL, ctx->hpav_conf.sl_str,
        LIBSPID_HPAV_CONF_SL_STR_MAX_LEN))
        || (LIBSPID_SUCCESS != libspid_config_read_item (ctx->hpav_conf_path,
        LIBSPID_HPAV_CONF_LABEL_USER_HFID, ctx->hpav_conf.user_hfid,
        LIBSPID_HPAV_CONF_HFID_MAX_LEN))
        || (LIBSPID_SUCCESS != libspid_config_read_item (ctx->hpav_conf_path,
        LIBSPID_HPAV_CONF_LABEL_AVLN_HFID, ctx->hpav_conf.avln_hfid,
        LIBSPID_HPAV_CONF_HFID_MAX_LEN)))
    {
        syslog (LOG_WARNING, "libspid config read item failed");
        return -1;
    }
    ctx->hpav_conf.is_cco_preferred = LIBSPID_GET_BOOLEAN (is_cco_preferred_str);
    ctx->hpav_conf.was_cco = LIBSPID_GET_BOOLEAN (was_cco_str);

    return 0;
}

/**
 * Un-initialize PLC daemon.
 *
 * \param  ctx  plcd context
 */
void
plcd_uninit (plcd_ctx_t *ctx)
{
    close (ctx->plc_sock);
}


/******************************************************************************/
/* MAIN FUNCTION                                                              */
/******************************************************************************/

/**
 * Program entry.
 *
 * \param  argc  number of program arguments
 * \param  argv  table of (argc) program arguments
 * \return  EXIT_FAILURE on error, EXIT_SUCCESS otherwise
 */
int
#ifdef __UTESTS__
utests_main (int argc, char **argv)
#else
main (int argc, char **argv)
#endif /* __UTESTS__ */
{
    int c = 0, opt_index = 0, init_nb = 0, init_ret = -1;

    /* main context */
    plcd_ctx_t ctx;

    /* input program arguments */
    struct option long_opts[] = {{"conf_file", required_argument, NULL, 'c'},
        {"info_file", required_argument, NULL, 'i'},
        {"version", no_argument, NULL, 'v'}};

    /* init context */
    if (0 > plcd_init (&ctx))
    {
        exit (EXIT_FAILURE);
    }

    /* show PLCD version */
    syslog (LOG_NOTICE, "PLC Daemon (%s) Running\n", VERSION);

    /* open log process */
    openlog (argv[0], 0, LOG_DAEMON);

    /* process options */
    while (-1 != (c = getopt_long_only (argc, argv, "c:i:v:", long_opts,
                                        &opt_index)))
    {
        switch(c)
        {
            case 'c':
                /* HPAV config file */
                ctx.hpav_conf_path = optarg;
                break;
            case 'i':
                /* HPAV info file */
                ctx.hpav_info_path = optarg;
                break;
            case 'v':
                /* version number */
                fprintf (stdout, "%s\n", VERSION);
                exit (EXIT_SUCCESS);
            default:
                plcd_print_usage (argv[0]);
                exit (EXIT_SUCCESS);
        }
    }

    /* initialize the AV / EoC stack
     * and loop (PLCD_INIT_RETRIES maximum) until successful init */
    for (init_nb = 0; init_nb < PLCD_INIT_RETRIES; init_nb++)
    {
        if (0 == (init_ret = plcd_stack_init (&ctx)))
        {
            break;
        }
    }
    if (0 != init_ret)
    {
        syslog (LOG_WARNING, "stack init failed\n");
        exit (EXIT_FAILURE);
    }

    pid_t pid = getpid ();

    /* register to hpav.conf and hpav.info files update */
    if ((LIBSPID_SUCCESS != libspid_system_file_update_register (pid,
        LIBSPID_HPAV_CONF_PATH, plcd_signal_handler))
        || (LIBSPID_SUCCESS != libspid_system_file_update_register (pid,
        LIBSPID_HPAV_INFO_PATH, plcd_signal_handler)))
    {
        exit (EXIT_FAILURE);
    }

    /* register to mcast.info file update */
    if (libspid_system_file_update_register (pid,
                                             LIBSPID_MCAST_INFO_PATH,
                                             plcd_signal_handler)
        != LIBSPID_SUCCESS)
    {
        exit (EXIT_FAILURE);
    }

    /* now get all events from plcdrv (i.e. DRV MME-s) */
    while (1)
    {
        if (0 > plcd_stack_event_dispatch (&ctx))
        {
            exit (EXIT_FAILURE);
        }
    }

    plcd_uninit (&ctx);
    exit (EXIT_SUCCESS);
}