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path: root/cleopatre/devkit/plcd/src/plcd_daemon.c
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/* Cleopatre project {{{
 *
 * Copyright (C) 2013 MStar Semiconductor
 *
 * <<<Licence>>>
 *
 * }}} */
/**
 * \file    devkit/plcd/src/plcd_daemon.c
 * \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 "plcd_daemon.h"
#include "plcd_stack.h"
#include "plcd_autoswitch.h"
#include "plcd_files.h"
#include "plcd_ctx.h"

#include "libspid.h"

#include <net/if.h> /* for ifreq */
#include <syslog.h>
#include <sys/ioctl.h>
#include <unistd.h> /* for getpid() */
#include <errno.h>

#include "ioctl.h"
#include "nvram_utils.h"

/* "utest_override" include must be the last include. */
#include "utest_override.h"

/* Interface name */
#define PLC_IFNAME  "plc0"


static plcd_nvram_t g_nvram;
volatile sig_atomic_t is_process_signal_needed;
volatile sig_atomic_t exit_requested;

static int
nvram_init (plcd_nvram_t *nvram)
{
    int status = libspid_get_plc_address (&(nvram->plc_address), 6);
    status |= libspid_get_device_password (&(nvram->device_password), 32);
    status |= libspid_get_product_name (&(nvram->product_name), 64);
    status |= libspid_get_tonemask (&(nvram->tonemask), 192);

    return status;
}

/**
 * Handle signals reception.
 *
 * \param  signal_nb  signal identifier
 */
static void
plcd_daemon_signal_handler (int signal_nb)
{
    /* Check received signal. */
    if (SIGHUP == signal_nb)
        is_process_signal_needed = 1;
    else if (SIGTERM == signal_nb)
        exit_requested = 1;
}

/**
 * Opposite function of plcd_daemon_open
 *
 * This function is called after a successful open, or not.
 *
 * \param  ctx  plcd context
 */
static void
plcd_daemon_close (plcd_ctx_t *ctx)
{
    PLCD_ASSERT (ctx);

    /* TODO: Unregister PID into plcdrv. */

    /* Close the socket if opened. */
    if (0 < ctx->plc_sock)
    {
        close (ctx->plc_sock);
        ctx->plc_sock = 0;
    }

    /* Ignore SIGTERM now. */
    signal (SIGTERM, SIG_IGN);
}

/**
 * Open socket to plcdrv, set signals, etc...
 *
 * \param  ctx  plcd context
 * \return -1 on error, 0 otherwise
 */
static int
plcd_daemon_open (plcd_ctx_t *ctx)
{
    struct plcdrv_setpid user_data;
    struct ifreq ifr;
    enum {
        PLCD_DAEMON_OPEN__SUCCESS,
        PLCD_DAEMON_OPEN__SOCKET_FAIL,
        PLCD_DAEMON_OPEN__BIND_FAIL,
        PLCD_DAEMON_OPEN__IOCTL_FAIL,
        PLCD_DAEMON_OPEN__NVRAM_FAIL,
    } result;

    PLCD_ASSERT (ctx);

    /* Bind signal before send PID to plcdrv. */
    signal (SIGTERM, plcd_daemon_signal_handler);

    memset (&user_data, 0, sizeof (struct plcdrv_setpid));
    memset (&ifr, 0, sizeof (struct ifreq));
    result = PLCD_DAEMON_OPEN__SUCCESS;

    /* open netlink socket */
    ctx->plc_sock = socket (PF_NETLINK, SOCK_RAW, NETLINK_PLC_DRV);

    if (0 < ctx->plc_sock)
    {
        ctx->plcd_addr.nl_family = AF_NETLINK;
        ctx->plcd_addr.nl_pid = ctx->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)))
        {
            /* Set plcd pid for reception on drv netlink */
            user_data.nl = NETLINK_PLC_DRV;
            user_data.pid = ctx->pid;

            ifr.ifr_data = (void *) &user_data;
            strncpy (ifr.ifr_name, PLC_IFNAME, IFNAMSIZ);
            if (0 <= ioctl (ctx->plc_sock, PLCDRV_IOCTL_SETPID, &ifr))
            {
                ctx->nvram = &g_nvram;
                if (nvram_init (ctx->nvram))
                {
                    syslog (LOG_ERR, "libspid system get nvram failed");
                    result = PLCD_DAEMON_OPEN__NVRAM_FAIL;
                }
            }
            else
            {
                syslog (LOG_ERR,
                        "ioctl set PID failed (%s)", strerror (errno));
                result = PLCD_DAEMON_OPEN__IOCTL_FAIL;
            }
        }
        else
        {
            syslog (LOG_ERR, "socket bind failed");
            result = PLCD_DAEMON_OPEN__BIND_FAIL;
        }
    }
    else
    {
        syslog (LOG_ERR, "socket open failed");
        result = PLCD_DAEMON_OPEN__SOCKET_FAIL;
    }

    if (result == PLCD_DAEMON_OPEN__SUCCESS)
        return 0;
    else
    {
        if (result > PLCD_DAEMON_OPEN__IOCTL_FAIL)
        {
            /* TODO: Unregister the plcd into plcdrv */
        }

        if (result > PLCD_DAEMON_OPEN__SOCKET_FAIL)
        {
            close (ctx->plc_sock);
            ctx->plc_sock = 0;
        }

        return -1;
    }
}

/**
 * PLC daemon.
 *
 * \param  ctx  plcd context
 */
void
plcd_daemon_main (plcd_ctx_t *ctx)
{
    PLCD_ASSERT (ctx);

    if (0 > plcd_files_read_hpavconf (ctx)
        || 0 > plcd_files_write_default_hpavinfo (ctx))
        return;

    int init_nb, init_ret = -1;
    is_process_signal_needed = 0;

    if (0 <= plcd_daemon_open (ctx))
    {
        /* Show PLCD version. */
        syslog (LOG_NOTICE, "PLC Daemon (%s) Running\n",
                VERSION);

        /* 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_ERR, "stack init failed\n");
        else
        {
            if (LIBSPID_SUCCESS != libspid_system_file_update_register (
                    ctx->pid, LIBSPID_HPAV_CONF_PATH,
                    plcd_daemon_signal_handler))
                syslog (LOG_ERR, "libspid register hpav.conf failed\n");
            else
            {
                if (LIBSPID_SUCCESS != libspid_system_file_update_register (
                        ctx->pid, LIBSPID_HPAV_INFO_PATH,
                        plcd_daemon_signal_handler))
                    syslog (LOG_ERR, "libspid register hpav.info failed\n");
                else
                {
                    if (LIBSPID_SUCCESS != libspid_system_file_update_register (
                            ctx->pid, LIBSPID_MULTICAST_INFO_PATH,
                            plcd_daemon_signal_handler))
                        syslog (LOG_ERR, "libspid register multicast.info failed\n");
                    else
                    {
                        /* Initialize autoswitch timer. */
                        plcd_autoswitch_timer_init ();

                        /* now get all events from plcdrv (i.e. DRV MME-s) */
                        while (!exit_requested)
                        {
                            if (0 > plcd_stack_event_dispatch (ctx))
                            {
                                syslog (LOG_ERR, "plcd_stack_event_dispatch failed\n");
                                break;
                            }
                        }

                        libspid_system_file_update_unregister (
                            ctx->pid, LIBSPID_MULTICAST_INFO_PATH);
                    }
                    libspid_system_file_update_unregister (
                        ctx->pid, LIBSPID_HPAV_CONF_PATH);
                }
                libspid_system_file_update_unregister (
                    ctx->pid, LIBSPID_HPAV_INFO_PATH);
            }
            /* XXX no plcd_stack_unit. */
        }
        plcd_daemon_close (ctx);
    }
}