/**

 * GMyth Library

 *

 * @file gmyth/gmyth_socket.c

 * 

 * @brief <p> MythTV socket implementation, according to the MythTV Project

 * (www.mythtv.org). 

 * 

 * This component provides basic socket functionalities to interact with

 * the Mythtv backend.

 * <p>

 *

 * Copyright (C) 2006 INdT - Instituto Nokia de Tecnologia.

 * @author Rosfran Lins Borges <rosfran.borges@indt.org.br> 

 *

 *//*

 * 

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU Lesser 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 Lesser 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

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "gmyth_socket.h"

#include <glib.h> 

#include <glib/gprintf.h>

#include <arpa/inet.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <sys/param.h>

#include <netdb.h>

#include <net/if.h>

#include <errno.h>

#include <stdlib.h>

#include <unistd.h>

#include <netinet/in.h>

#include <fcntl.h>

#include <signal.h>

#include <sys/ioctl.h>

#include "gmyth_stringlist.h"

#include "gmyth_uri.h"

#include "gmyth_debug.h"

#define BUFLEN 				   	512

#define MYTH_SEPARATOR 			    	"[]:[]"

#define MYTH_PROTOCOL_FIELD_SIZE		8

/* max number of iterations */

#define MYTHTV_MAX_VERSION_CHECKS		40

// FIXME: put this in the right place

#define  MYTHTV_VERSION_DEFAULT			30

static GStaticMutex mutex = G_STATIC_MUTEX_INIT;

static gchar* local_hostname = NULL;

static void gmyth_socket_class_init          (GMythSocketClass *klass);

static void gmyth_socket_init                (GMythSocket *object);

static void gmyth_socket_dispose  (GObject *object);

static void gmyth_socket_finalize (GObject *object);

G_DEFINE_TYPE(GMythSocket, gmyth_socket, G_TYPE_OBJECT)

static void

gmyth_socket_class_init (GMythSocketClass *klass)

{

    GObjectClass *gobject_class;

    gobject_class = (GObjectClass *) klass;

    gobject_class->dispose  = gmyth_socket_dispose;

    gobject_class->finalize = gmyth_socket_finalize;	

}

static void

gmyth_socket_init (GMythSocket *gmyth_socket)

{

	/* gmyth_socket->local_hostname = NULL; */

}

/** Gets the some important address translation info, from the client socket

 * that will open a connection.

 * 

 * @return gint that represents the error number from getaddrinfo(). 

 */

static gint

gmyth_socket_toaddrinfo (const gchar *addr, gint port, struct addrinfo **addrInfo )

{

    struct addrinfo hints;

    gchar *portStr = NULL;

    gint errorn = EADDRNOTAVAIL;

    g_return_val_if_fail ( addr != NULL, -1 );

    g_debug ("Calling %s\n", __FUNCTION__);

    /* hints = g_malloc0 ( sizeof(struct addrinfo) ); */

    memset ( &hints, 0, sizeof(struct addrinfo) );

    hints.ai_family = AF_INET;

    hints.ai_socktype = SOCK_STREAM;

    /* hints.ai_flags = AI_NUMERICHOST; */

    if ( port != -1 )	

        portStr = g_strdup_printf ( "%d", port );

    else

	portStr = NULL;

    gmyth_debug ("Getting name resolution for: %s, %d\n", addr, port);

    if ( ( errorn = getaddrinfo(addr, portStr, &hints, addrInfo) ) != 0 ) {

		g_printerr( "[%s] Socket ERROR: %s\n", __FUNCTION__, gai_strerror(errorn) );

    }

    g_free (portStr);

    /* g_free (hints); */

    return errorn;

}

static gint

gmyth_socket_find_match_address_uri( GMythURI* uri, gchar *address ) {

        if ( g_ascii_strcasecmp( gmyth_uri_get_host( uri ), address ) == 0 ) {

                //g_printerr( "Found URI: %s !!!\n", rui_uri_getvalue(uri) );

                return 0;

        } else {

                return -1;

        }

}

static const gchar *PATH_PROC_NET_DEV = "/proc/net/dev";

/** Gets the list of all local network interfaces (using the /proc/net/dev directory).

 * 

 * @param current_connections	A list with all the network interfaces are valid, 

 * 		to be applied just like a filter.

 * @return List with all the local net interfaces. 

 */

static GList *

gmyth_socket_get_local_addrs( GList *current_connections )

{

	GList *local_addrs = NULL;

	FILE *fd;

	gint s;

	gchar buffer[256+1];

	gchar ifaddr[20+1];

	gchar *ifname;

	gchar *sep;

	s = socket(AF_INET, SOCK_DGRAM, 0);

	if (s < 0)

		return 0;

	fd = fopen(PATH_PROC_NET_DEV, "r");

	fgets(buffer, sizeof(buffer)-1, fd);

	fgets(buffer, sizeof(buffer)-1, fd);

	while (!feof(fd)) {

		ifname = buffer;

		sep;

		if (fgets(buffer, sizeof(buffer)-1, fd) == NULL)

			break;

		sep = strrchr(buffer, ':');

		if (sep)

			*sep = 0;

		while (*ifname == ' ')

			ifname++;

		struct ifreq req;

		strcpy(req.ifr_name, ifname);

		if (ioctl(s, SIOCGIFFLAGS, &req) < 0)

			continue;

		if (!(req.ifr_flags & IFF_UP))

			continue;

		if (req.ifr_flags & IFF_LOOPBACK)

			continue;

		if (ioctl(s, SIOCGIFADDR, &req) < 0)

			continue;

		g_strlcpy( ifaddr, inet_ntoa(((struct sockaddr_in*)&req.ifr_addr)->sin_addr), sizeof(struct ifaddr)-1 );

		local_addrs = g_list_append( local_addrs, g_strdup( ifaddr ) );

		gmyth_debug( "( from the /proc/net/dev) Interface name: %s, address: %s\n", 

								ifname, ifaddr );

	}

	fclose(fd);

	close(s);

	return local_addrs;

}

/**

 * Get only the local addresses from the primary interface

 */

static gchar *

gmyth_socket_get_primary_addr()

{

	gchar *if_eth0 = g_new0( gchar, sizeof(struct ifaddr)-1 );

	GList *if_tmp = NULL;

	GList *interfs = gmyth_socket_get_local_addrs( NULL );

	if ( interfs != NULL && ( g_list_length( interfs ) > 0 ) ) 

	{

		/* get the first occurrence (primary interface) */

		if_tmp = g_list_first( interfs );

		if ( if_tmp != NULL )

			g_strlcpy (if_eth0, (gchar *)if_tmp->data, sizeof(struct ifaddr)-1 );

	}

	if ( interfs != NULL )

		g_list_free( interfs );

	return if_eth0;

}

/** This function retrieves the local hostname of the 

 * client machine.

 *

 * @return GString* get local hostname.

 */

GString *

gmyth_socket_get_local_hostname  ()

{

    char hname[50];

    gint res = gethostname (hname, 50);

    if (res == -1) {

	g_debug ("Error while getting hostname");

	return NULL;

    }

    return g_string_new (hname);

#if 0	

    GString *str = NULL;

    if ( local_hostname != NULL && strlen(local_hostname) > 0 )

    	return g_string_new( local_hostname );

    gchar *localaddr = NULL; 

    gboolean found_addr = FALSE;

    struct addrinfo* addr_info_data = NULL, *addr_info0 = NULL;

    struct sockaddr_in* sa = NULL;

    gchar localhostname[MAXHOSTNAMELEN];

    if (gethostname (localhostname, MAXHOSTNAMELEN) != 0 ) {

    	gmyth_debug ( "Error on gethostname" );

    }

    localhostname[MAXHOSTNAMELEN-1] = 0;

    gint err = gmyth_socket_toaddrinfo (localhostname, -1,  &addr_info_data );

    if ( err == EADDRNOTAVAIL )

    {

    	g_warning( "[%s] Address (%s) not available. (reason = %d)\n", __FUNCTION__, localhostname, err );

    	return str;

    }

    g_static_mutex_lock( &mutex );    	

    addr_info0 = addr_info_data;

    while( addr_info0 != NULL && addr_info0->ai_addr != NULL && 

	    ( sa = (struct sockaddr_in*)addr_info0->ai_addr ) != NULL && !found_addr ) {

    	localaddr = inet_ntoa( sa->sin_addr );

	    if ( localaddr != NULL && ( g_strrstr( localaddr, "127" ) == NULL ) ) {

	        str = g_string_new (localaddr);

	        found_addr = TRUE;

		g_free (localaddr);

	        break;

	    }

/*

	    if (localaddr != NULL) {

		g_free (localaddr);

		localaddr = NULL;

	    }

	    */

	    addr_info0 = addr_info0->ai_next;

    };

    freeaddrinfo (addr_info_data);

    addr_info_data = NULL;

    if ( found_addr == FALSE ) {

        gchar *prim_addr = gmyth_socket_get_primary_addr();

    	if ( prim_addr != NULL ) {

		g_warning("[%s] Could not determine the local alphanumerical hostname. Setting to %s\n",

    	        __FUNCTION__, prim_addr );

	        str = g_string_new (prim_addr);

	        g_free (prim_addr);

    	} else {

        	str = g_string_new (localhostname);

    	}

    }

    g_static_mutex_unlock (&mutex);

    if ( str != NULL && str->str != NULL )

    	local_hostname = g_strdup( str->str );

    return str;

#endif    

}

static void

gmyth_socket_dispose  (GObject *object)

{

    GMythSocket *gmyth_socket = GMYTH_SOCKET(object);

    /* disconnect socket */

    gmyth_socket_close_connection (gmyth_socket);

    g_free (gmyth_socket->hostname);

    gmyth_socket->hostname = NULL;

    g_free (local_hostname);

    local_hostname = NULL;

    G_OBJECT_CLASS (gmyth_socket_parent_class)->dispose (object);

}

static void

gmyth_socket_finalize (GObject *object)

{

    g_signal_handlers_destroy (object);

    G_OBJECT_CLASS (gmyth_socket_parent_class)->finalize (object);

}

/** Creates a new instance of GMythSocket.

 * 

 * @return a new instance of GMythSocket.

 */

GMythSocket*

gmyth_socket_new ()

{

    GMythSocket *gmyth_socket = GMYTH_SOCKET (g_object_new(GMYTH_SOCKET_TYPE, NULL));

    gmyth_socket->mythtv_version = MYTHTV_VERSION_DEFAULT;

    return gmyth_socket;

}

/** Try to open an asynchronous connection to the MythTV backend.

 * 

 * @param fd 			Socket descriptor.

 * @param remote 	Remote address.

 * @param len 		Newly created socket length field.

 * @param timeout	Timeval argument with the time interval to timeout before closing.

 * @param err			Error message number.

 * @return Any numerical value below 0, if an error had been found.

 */

static gint 

gmyth_socket_try_connect ( gint fd, struct sockaddr *remote, gint len,

               struct timeval *timeout, gint *err)

{

	  /*g_return_val_if_fail( timeout != NULL, 0 );*/	  

	  gint saveflags, ret, back_err;

	  fd_set fd_w;

	  saveflags = fcntl( fd, F_GETFL, 0 );

	  if( saveflags < 0 ) {

	    g_warning( "[%s] Problems when getting socket flags on fcntl.\n", __FUNCTION__ );

	    *err=errno;

	    return -1;

	  }

	  /* Set non blocking */

	  if( fcntl( fd, F_SETFL, saveflags | O_NONBLOCK ) < 0) {

	  	g_warning( "[%s] Problems when setting non-blocking using fcntl.\n", __FUNCTION__ );

	    *err=errno;

	    return -1;

	  }

	  /* This will return immediately */

	  *err= connect ( fd, remote, len );

		back_err=errno;

		/* restore flags */

	  if( fcntl( fd, F_SETFL, saveflags ) < 0) {

	    g_warning( "[%s] Problems when trying to restore flags with fcntl.\n", __FUNCTION__ );

	    *err=errno;

	    return -1;

	  }

	  /* return unless the connection was successful or the connect is

	     still in progress. */

	  if( *err < 0 && back_err != EINPROGRESS) {

	    g_warning( "[%s] Connection unsucessfully (it is not in progress).\n", __FUNCTION__ );

	    *err = errno;

	    return -1;

	  }

	  FD_ZERO( &fd_w );

	  FD_SET( fd, &fd_w );

	  *err = select( FD_SETSIZE, NULL, &fd_w, NULL, timeout);

	  if ( *err < 0 ) {

	    g_warning( "[%s] Connection unsucessfull (timed out).\n", __FUNCTION__ );

	    *err=errno;

	    return -1;

	  }

	  /* 0 means it timeout out & no fds changed */

	  if(*err==0) {

	    close(fd);

	    *err=ETIMEDOUT;

	    return -1;

	  }

	  /* Get the return code from the connect */

	  len = sizeof( ret );

	  *err=getsockopt( fd, SOL_SOCKET, SO_ERROR, &ret, (socklen_t *) &len);

	  if( *err < 0 ) {

	    g_warning( "[%s] Connection usnsucessfull.\n", __FUNCTION__ );

	    *err=errno;

	    return -1;

	  }

	  /* ret=0 means success, otherwise it contains the errno */

	  if (ret) {

	    *err=ret;

	    return -1;

	  }

	  *err=0;

	  return 0;

}

/** Connects to the backend.

 * 

 * @param gmyth_socket The GMythSocket instance.

 * @param hostname The backend hostname or IP address.

 * @param port The backend port.

 * @return TRUE if success, FALSE if error.

 */

gboolean

gmyth_socket_connect (GMythSocket *gmyth_socket,

	const gchar *hostname, gint port)

{

    return gmyth_socket_connect_with_timeout (gmyth_socket,

		    hostname, port, 0);

}

gboolean

gmyth_socket_connect_with_timeout (GMythSocket *gmyth_socket,

	const gchar *hostname, gint port, guint timeout)

{

    struct addrinfo *addr_info_data = NULL, *addr_info0 = NULL;

    gint ret_code = -1;

    gint errno;

    gboolean ret = TRUE;

    gmyth_debug ("CONNECTING %s:%d", hostname, port);

    if ( hostname == NULL )

        gmyth_debug ( "Invalid hostname parameter!\n");

    /* store hostname and port number */

    if (gmyth_socket->hostname != NULL) {

        //g_free (gmyth_socket->hostname);

        gmyth_socket->hostname = NULL;

    }

    errno = gmyth_socket_toaddrinfo ( hostname, port, &addr_info_data );

    g_return_val_if_fail( addr_info_data != NULL && hostname != NULL, FALSE );

    gmyth_socket->hostname = g_strdup( hostname );

    gmyth_socket->port = port;

    for ( addr_info0 = addr_info_data; addr_info0; addr_info0 = addr_info_data->ai_next ) {

        /* init socket descriptor */

        gmyth_socket->sd = socket( addr_info0->ai_family, addr_info0->ai_socktype,

                         addr_info0->ai_protocol );

        if ( gmyth_socket->sd < 0 )

            continue;

        struct timeval *timeout_val = g_new0 (struct timeval, 1);

	if (timeout != 0) {

	    /*timeout_val = g_new0 (struct timeval, 1);*/

            timeout_val->tv_sec = timeout;

            timeout_val->tv_usec = 0;

	} else {

            timeout_val->tv_sec = 5;

            timeout_val->tv_usec = 100;

	}

        if (gmyth_socket_try_connect (gmyth_socket->sd, (struct sockaddr *)addr_info0->ai_addr,

                addr_info0->ai_addrlen, timeout_val, &ret_code ) < 0 )

        {

            g_printerr( "[%s] Error connecting to backend!\n", __FUNCTION__ );

            if (ret_code == ETIMEDOUT)

                g_printerr( "[%s]\tBackend host unreachable!\n", __FUNCTION__ );

            close (gmyth_socket->sd);

            gmyth_socket->sd = -1;

            g_printerr ("ERROR: %s\n", gai_strerror(ret_code));

	    g_free (timeout_val);

            continue;

        }

	g_free (timeout_val);

        /* only will be reached if none of the error above occurred */

        break;

    }

    freeaddrinfo (addr_info_data);

    addr_info_data = NULL;

    if (gmyth_socket->sd_io_ch != NULL) {

        g_io_channel_unref (gmyth_socket->sd_io_ch);

        gmyth_socket->sd_io_ch = NULL;

    }

    gmyth_socket->sd_io_ch = g_io_channel_unix_new (gmyth_socket->sd);

    //GIOFlags flags = g_io_channel_get_flags (gmyth_socket->sd_io_ch);

		/* unset the nonblock flag */

		//flags &= ~G_IO_FLAG_NONBLOCK;

		/* unset the nonblocking stuff for some time, because GNUTLS doesn't like

		 * that */

		//g_io_channel_set_flags (gmyth_socket->sd_io_ch, flags, NULL);

    ret = ( ret_code == 0 ) ? TRUE : FALSE ;

    return ret;

}

/** Gets the GIOChannel associated to the given GMythSocket.

 * 

 * @param gmyth_socket The GMythSocket instance.

 */

GIOChannel *

gmyth_socket_get_io_channel( GMythSocket *gmyth_socket )

{

    g_return_val_if_fail( gmyth_socket != NULL, NULL );

    return gmyth_socket->sd_io_ch;

}

/** Verifies if the socket is able to read.

 * 

 * @param gmyth_socket The GMythSocket instance.

 * @return TRUE if the socket is able to read, FALSE if not.

 */

gboolean

gmyth_socket_is_able_to_read( GMythSocket *gmyth_socket )

{

    gboolean ret = TRUE;

    /* verify if the input (read) buffer is ready to receive data */

    GIOCondition io_cond = g_io_channel_get_buffer_condition( gmyth_socket->sd_io_ch );

    if ( ( io_cond & G_IO_IN ) == 0 ) {

	g_warning ("[%s] IO channel is not able to send data!\n", __FUNCTION__);

	ret = FALSE;

    }

    return ret;

}

/** Verifies if the socket is able to write.

 * 

 * @param gmyth_socket The GMythSocket instance.

 * @return TRUE if the socket is able to write, FALSE if not.

 */

gboolean

gmyth_socket_is_able_to_write( GMythSocket *gmyth_socket )

{

    gboolean ret = TRUE;

    /* verify if the input (read) buffer is ready to receive data */

    GIOCondition io_cond = g_io_channel_get_buffer_condition( gmyth_socket->sd_io_ch );

    if ( ( ( io_cond & G_IO_OUT ) == 0 ) || ( ( io_cond & G_IO_HUP ) == 0 ) ) {

	g_warning ("[%s] IO channel is not able to send data!\n", __FUNCTION__);

	ret = FALSE;

    }

    return ret;

}

/** Sends a command to the backend.

 * 

 * @param gmyth_socket the GMythSocket instance.

 * @param command The string command to be sent.

 */

gboolean

gmyth_socket_send_command(GMythSocket *gmyth_socket, GString *command) 

{

    gboolean ret = TRUE;

    GIOStatus io_status = G_IO_STATUS_NORMAL;

    //GIOCondition io_cond;

    GError* error = NULL;

    gchar *buffer = NULL;

    gsize bytes_written = 0;

    if( command == NULL || ( command->len <= 0 ) || command->str == NULL ) {

		g_warning ("[%s] Invalid NULL command parameter!\n", __FUNCTION__);

		ret = FALSE;

		goto done;

    }

    //g_static_mutex_lock( &mutex );

    gmyth_debug ("Sending command to backend: %s\n", command->str);

    buffer = g_strnfill( BUFLEN, ' ' );

    g_snprintf( buffer, MYTH_PROTOCOL_FIELD_SIZE+1, "%-8d", command->len);

    command = g_string_prepend(command, buffer);

    /* write bytes to socket */    

    io_status = g_io_channel_write_chars( gmyth_socket->sd_io_ch, command->str, 

	    command->len, &bytes_written, &error );

    if( (io_status == G_IO_STATUS_ERROR) || ( bytes_written <= 0 ) ) {

		g_warning ("[%s] Error while writing to socket", __FUNCTION__);

		ret = FALSE;

    } else if ( bytes_written < command->len ) {

		g_warning ("[%s] Not all data was written socket", __FUNCTION__);

		ret = FALSE;

    }

    io_status = g_io_channel_flush( gmyth_socket->sd_io_ch, &error );

    if ( ( bytes_written != command->len ) || ( io_status == G_IO_STATUS_ERROR ) )

    {

		g_warning ("[%s] Some problem occurred when sending data to the socket\n", __FUNCTION__);

		ret = TRUE;

    }

    //g_static_mutex_unlock( &mutex );

done:

    if ( error != NULL ) {

		g_printerr( "[%s] Error found reading data from IO channel: (%d, %s)\n", __FUNCTION__, error->code, error->message );

		ret = FALSE;

		g_error_free( error );

    }

    if ( buffer!= NULL )

		g_free( buffer );

    return ret;

}

/** Starts Mythtv protocol level connection. Checks Mythtv protocol version

 * supported by the backend and send the "ANN" command.

 * 

 * @param gmyth_socket the GMythSocket instance.

 * @param hostname_backend The backend hostname or IP address.

 * @param port The backend port to connect.

 * @param blocking_client A flag to choose between blocking and non-blocking

 * @param with_events	Sets the connection flag to receive events.

 * 										backend connection. 

 */

static gboolean

gmyth_socket_connect_to_backend_and_events (GMythSocket *gmyth_socket, 

	const gchar *hostname_backend, gint port, gboolean blocking_client,

	gboolean with_events)

{

    if (!gmyth_socket_connect (gmyth_socket, hostname_backend, port)) {

		g_warning ("[%s] Could not open socket to backend machine [%s]\n", __FUNCTION__,

					hostname_backend );

		return FALSE;

    }

    if ( gmyth_socket_check_protocol_version (gmyth_socket) ) {

	GString *result;

	GString *base_str = g_string_new("");

	GString *hostname = NULL;

	hostname = gmyth_socket_get_local_hostname();

	if (hostname == NULL) {

	    g_debug ("Hostname not available, setting to n800frontend\n");

	    hostname = g_strdup ("n800frontend");

	}

	g_string_printf(base_str, "ANN %s %s %u", 

		(blocking_client ? "Playback" : "Monitor"),

		hostname->str, with_events);

	gmyth_socket_send_command (gmyth_socket, base_str);

	result = gmyth_socket_receive_response (gmyth_socket);

	if (result != NULL) {

	    gmyth_debug ("Response received from backend: %s", result->str);

	    g_string_free (result, TRUE);

	}

	g_string_free (hostname, TRUE);

	g_string_free (base_str, TRUE);

	return TRUE;

    } else {

	g_warning ("[%s] GMythSocket could not connect to the backend", __FUNCTION__);	

	return FALSE;

    }

}

/** Starts Mythtv protocol level connection. Checks Mythtv protocol version

 * supported by the backend and send the "ANN" command.

 * 

 * @param gmyth_socket the GMythSocket instance.

 * @param hostname_backend The backend hostname or IP address.

 * @param port The backend port to connect.

 * @param blocking_client A flag to choose between blocking and non-blocking 

 */

gboolean

gmyth_socket_connect_to_backend (GMythSocket *gmyth_socket, 

	const gchar *hostname_backend, gint port, gboolean blocking_client)

{

    if (!gmyth_socket_connect_to_backend_and_events ( gmyth_socket, hostname_backend, port,

    		blocking_client, FALSE) ) {

		gmyth_debug ("Could not open socket to backend machine [%s]\n",

					hostname_backend );

		return FALSE;

    }

    return TRUE;

}

/** Starts Mythtv protocol level connection. Checks Mythtv protocol version

 * supported by the backend and send the "ANN" command.

 * 

 * @param gmyth_socket the GMythSocket instance.

 * @param hostname_backend The backend hostname or IP address.

 * @param port The backend port to connect.

 * @param blocking_client A flag to choose between blocking and non-blocking 

 */

gboolean

gmyth_socket_connect_to_backend_events (GMythSocket *gmyth_socket, 

	const gchar *hostname_backend, gint port, gboolean blocking_client)

{

    if (!gmyth_socket_connect_to_backend_and_events ( gmyth_socket, hostname_backend, port,

    		blocking_client, TRUE) ) {

		gmyth_debug ("Could not open socket to backend machine in order to receive events [%s]\n",

					hostname_backend );

		return FALSE;

    }

    return TRUE;

}

/** Closes the socket connection to the backend.

 * 

 * @param gmyth_socket The GMythSocket instance.

 */

void

gmyth_socket_close_connection (GMythSocket *gmyth_socket)

{

    close (gmyth_socket->sd);	

    gmyth_socket->sd = -1;

    if (gmyth_socket->sd_io_ch != NULL) {

        g_io_channel_unref (gmyth_socket->sd_io_ch);

        gmyth_socket->sd_io_ch = NULL;

    }

}

/** Try the MythTV version numbers, and get the version returned by

 * the possible REJECT message, in order to contruct a new

 * MythTV version request.

 * 

 * @param gmyth_socket The GMythSocket instance.

 * @param mythtv_version The Mythtv protocol version to be tested

 * 

 * @return The actual MythTV the client is connected to.

 */

gint

gmyth_socket_check_protocol_version_number (GMythSocket *gmyth_socket, gint mythtv_version)

{

    GString *response = NULL;

    GString *payload = NULL;

    gboolean res = TRUE;

    gint mythtv_new_version = MYTHTV_CANNOT_NEGOTIATE_VERSION;

    guint max_iterations = MYTHTV_MAX_VERSION_CHECKS;

try_new_version:

    payload = g_string_new ("MYTH_PROTO_VERSION");

    g_string_append_printf( payload, " %d", mythtv_version );

    gmyth_socket_send_command(gmyth_socket, payload);

    response = gmyth_socket_receive_response(gmyth_socket);

    if (response == NULL) {

		g_warning ("[%s] Check protocol version error! Not answered!", __FUNCTION__);

		res = FALSE;	

		goto done;

    }

    res = g_str_has_prefix (response->str, "ACCEPT");

    if (!res) {

		g_warning ("[%s] Protocol version request error: %s", __FUNCTION__, response->str);

	/* get the version number returned by the REJECT message */

	if ( ( res = g_str_has_prefix (response->str, "REJECT") ) == TRUE ) {

        gchar *new_version = NULL;

	    new_version = g_strrstr( response->str, "]" );

	    if (new_version!=NULL) {

		++new_version; /* skip ']' character */

		if ( new_version != NULL ) {

		    gmyth_debug ( "[%s] got MythTV version = %s.\n", __FUNCTION__, new_version );

		    mythtv_version = (gint)g_ascii_strtoull (new_version, NULL, 10 );

		    /* do reconnection to the socket (socket is closed if the MythTV version was wrong) */

		    gmyth_socket_connect( gmyth_socket, gmyth_socket->hostname, gmyth_socket->port );

            new_version =NULL;

		    if ( --max_iterations > 0 ) 

		    	goto try_new_version;

		    else

		    	goto done;

		}

	    }

	}

    }

    /* change the return value to a valid one */

    if ( res ) {

    	mythtv_new_version = mythtv_version;

    	gmyth_socket->mythtv_version = mythtv_new_version;

    }

done:

    if ( payload != NULL )

		g_string_free (payload, TRUE);

    if ( response != NULL )

		g_string_free (response, TRUE);

    return mythtv_new_version;

}

/** Verifies if the Mythtv backend supported the GMyth supported version.

 * 

 * @param gmyth_socket The GMythSocket instance.

 * @return TRUE if supports, FALSE if not.

 */

gboolean

gmyth_socket_check_protocol_version (GMythSocket *gmyth_socket)

{

    return ( ( gmyth_socket->mythtv_version = 

    		gmyth_socket_check_protocol_version_number ( gmyth_socket, 

    							MYTHTV_VERSION_DEFAULT ) ) != MYTHTV_CANNOT_NEGOTIATE_VERSION );

}

/** Returns the Mythtv backend supported version.

 * 

 * @param gmyth_socket The GMythSocket instance.

 * @return The actual MythTV version number.

 */

gint

gmyth_socket_get_protocol_version (GMythSocket *gmyth_socket) 

{

	return gmyth_socket->mythtv_version;

}

/** Receives a backend answer after a gmyth_socket_send_command_call ().

 * 

 * @param gmyth_socket The GMythSocket instance.

 * @return The response received, or NULL if error or nothing was received.

 */

GString*

gmyth_socket_receive_response(GMythSocket *gmyth_socket)

{

    GIOStatus io_status = G_IO_STATUS_NORMAL;

    GError* error = NULL;

    gchar *buffer;

    GString *str = NULL;

    gsize bytes_read = 0;

    gint  len = 0;

    GIOCondition io_cond = g_io_channel_get_buffer_condition (gmyth_socket->sd_io_ch);

    g_return_val_if_fail( gmyth_socket != NULL, NULL );

    /* verify if the input (read) buffer is ready to receive data */

    //g_static_mutex_lock( &mutex );

    //buffer = g_new0 (gchar, MYTH_PROTOCOL_FIELD_SIZE);

    buffer = g_strnfill (MYTH_PROTOCOL_FIELD_SIZE, ' ');

    io_status = g_io_channel_read_chars (gmyth_socket->sd_io_ch, buffer, MYTH_PROTOCOL_FIELD_SIZE, &bytes_read, &error);

    /* verify if the input (read) buffer is ready to receive data */

    io_cond = g_io_channel_get_buffer_condition (gmyth_socket->sd_io_ch);

    gmyth_debug ( "[%s] Bytes read = %d\n", __FUNCTION__, bytes_read );

    if( (io_status == G_IO_STATUS_ERROR) || (bytes_read <= 0) ) {

		g_warning ("[%s] Error in mythprotocol response from backend\n", __FUNCTION__);

		str = NULL;

		//return NULL;

    } else {

		io_status = g_io_channel_flush( gmyth_socket->sd_io_ch, &error );

		/* verify if the input (read) buffer is ready to receive data */

		io_cond = g_io_channel_get_buffer_condition( gmyth_socket->sd_io_ch );

		//if ( ( io_cond & G_IO_IN ) != 0 ) {

            //gchar *buffer_aux = NULL;

		    /* removes trailing whitespace */

		    //buffer_aux = g_strstrip (buffer);

		    len = (gint)g_ascii_strtoull ( g_strstrip (buffer), NULL, 10 );

            if (buffer != NULL) {

                g_free (buffer);

                buffer = NULL;

            }

            /*            

            if (buffer_aux != NULL) {

                g_free (buffer_aux);

                buffer_aux = NULL;

            }

            */

            buffer = g_new0 (gchar, len+1);

		    bytes_read = 0;

		    io_status = g_io_channel_read_chars( gmyth_socket->sd_io_ch, buffer, len, &bytes_read, &error);

		    buffer[bytes_read] = '\0';

		//}

    }  

    //g_static_mutex_unlock( &mutex );

    gmyth_debug ("Response received from backend: {%s}\n", buffer);

    if ( ( bytes_read != len ) || ( io_status == G_IO_STATUS_ERROR ) )

		str = NULL;

    else

		str = g_string_new (buffer);

    if ( error != NULL ) {

		g_printerr( "[%s] Error found receiving response from the IO channel: (%d, %s)\n", __FUNCTION__, error->code, error->message );

		str = NULL;

		g_error_free (error);

    }

    g_free (buffer);

    return str;

}

/** Format a Mythtv command from the str_list entries and send it to backend.

 * 

 * @param gmyth_socket The GMythSocket instance.

 * @param str_list The string list to form the command

 * @return TRUE if command was sent, FALSE if any error happens.