path: root/embed/mozilla/mozilla-notifiers.cpp

/*
 *  Copyright (C) 2000 Nate Case 
 *
 *  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, 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.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "ephy-embed-shell.h"
#include "ephy-embed-single.h"
#include "mozilla-notifiers.h"
#include "eel-gconf-extensions.h"
#include "MozRegisterComponents.h"
#include "ephy-prefs.h"
#include "ephy-embed-prefs.h"
#include "ephy-langs.h"
#include "ephy-debug.h"

#include <stdio.h>
#include <string.h>
#include <locale.h>
#include <glib/gi18n.h>
#include <stdlib.h>
#include <gdk/gdkx.h>
#include <nsCOMPtr.h>
#include <nsIPrefService.h>
#include <nsIServiceManager.h>
#include <libgnome/gnome-i18n.h>

#define MOZILLA_PREF_NO_PROXIES "network.proxy.no_proxies_on"
#define MIGRATE_PIXEL_SIZE

static void
mozilla_cache_size_notifier (GConfClient *client,
                     guint cnxn_id,
                     GConfEntry *entry,
                     char *pref);
static void
mozilla_own_colors_notifier(GConfClient *client,
                guint cnxn_id,
                GConfEntry *entry,
                EphyEmbedSingle *single);
static void
mozilla_own_fonts_notifier(GConfClient *client,
               guint cnxn_id,
               GConfEntry *entry,
               EphyEmbedSingle *single);

static void
generic_mozilla_string_notifier(GConfClient *client,
                guint cnxn_id,
                GConfEntry *entry,
                const char *pref_name);
static void
generic_mozilla_int_notifier(GConfClient *client,
                 guint cnxn_id,
                 GConfEntry *entry,
                 const char *pref_name);
static void
generic_mozilla_bool_notifier(GConfClient *client,
                  guint cnxn_id,
                  GConfEntry *entry,
                  const char *pref_name);
static void
mozilla_allow_popups_notifier(GConfClient *client,
                  guint cnxn_id,
                  GConfEntry *entry,
                  EphyEmbedSingle *single);

static void
mozilla_language_notifier(GConfClient *client,
              guint cnxn_id,
              GConfEntry *entry,
              EphyEmbedSingle *single);

static void
mozilla_proxy_mode_notifier (GConfClient *client,
                 guint cnxn_id,
                 GConfEntry *entry,
                 EphyEmbedSingle *single);
static void
mozilla_proxy_autoconfig_notifier (GConfClient *client,
                       guint cnxn_id,
                       GConfEntry *entry,
                       EphyEmbedSingle *single);
static void
mozilla_proxy_mode_notifier (GConfClient *client,
                     guint cnxn_id,
                     GConfEntry *entry,
                     EphyEmbedSingle *single);
static void
mozilla_cookies_accept_notifier (GConfClient *client,
                         guint cnxn_id,
                         GConfEntry *entry,
                         char *pref);
static void
mozilla_proxy_ignore_notifier (GConfClient *client,
                       guint cnxn_id,
                       GConfEntry *entry,
                       EphyEmbedSingle *single);

/* Keeps the list of the notifiers we installed for mozilla prefs */
/* to be able to remove them when exiting */
GList *mozilla_notifiers = NULL;
GList *font_infos = NULL;

enum
{
    BOOL_PREF,
    INT_PREF,
    STRING_PREF
};

static const struct 
{
    char *gconf_key;
    guint pref_type;
    const char *mozilla_key;
}
conversion_table [] =
{
    { CONF_SECURITY_JAVA_ENABLED, BOOL_PREF, "security.enable_java"},
    { CONF_SECURITY_JAVASCRIPT_ENABLED, BOOL_PREF, "javascript.enabled"},
    { CONF_NETWORK_PROXY_AUTO_URL, STRING_PREF, "network.proxy.autoconfig_url"},
    { CONF_NETWORK_HTTP_PROXY, STRING_PREF, "network.proxy.http"},
    { CONF_NETWORK_FTP_PROXY, STRING_PREF, "network.proxy.ftp"},
    { CONF_NETWORK_SSL_PROXY, STRING_PREF, "network.proxy.ssl"},
    { CONF_NETWORK_HTTP_PROXY_PORT, INT_PREF, "network.proxy.http_port"},
    { CONF_NETWORK_FTP_PROXY_PORT, INT_PREF, "network.proxy.ftp_port"},
    { CONF_NETWORK_SSL_PROXY_PORT, INT_PREF, "network.proxy.ssl_port"},
    { CONF_LANGUAGE_DEFAULT_ENCODING, STRING_PREF, "intl.charset.default" },
    { CONF_LANGUAGE_AUTODETECT_ENCODING, STRING_PREF, "intl.charset.detector" },
    { CONF_RENDERING_DEFAULT_FONT, STRING_PREF, "font.default" },

    { NULL, 0, NULL }
};
 
static const struct 
{
    const char *gconf_key;
    GConfClientNotifyFunc func;
}
custom_notifiers [] =
{
    { CONF_RENDERING_USE_OWN_COLORS, 
      (GConfClientNotifyFunc) mozilla_own_colors_notifier },
    { CONF_RENDERING_USE_OWN_FONTS, 
      (GConfClientNotifyFunc) mozilla_own_fonts_notifier },
    { CONF_SECURITY_ALLOW_POPUPS, 
      (GConfClientNotifyFunc) mozilla_allow_popups_notifier },
    { CONF_RENDERING_LANGUAGE, 
      (GConfClientNotifyFunc) mozilla_language_notifier },
    { CONF_NETWORK_PROXY_MODE,
      (GConfClientNotifyFunc) mozilla_proxy_mode_notifier },
    { CONF_NETWORK_PROXY_AUTO_URL,
      (GConfClientNotifyFunc) mozilla_proxy_autoconfig_notifier },
    { CONF_NETWORK_CACHE_SIZE,
          (GConfClientNotifyFunc) mozilla_cache_size_notifier },
    { CONF_SECURITY_COOKIES_ACCEPT,
      (GConfClientNotifyFunc) mozilla_cookies_accept_notifier },
    { CONF_NETWORK_PROXY_IGNORE_HOSTS,
      (GConfClientNotifyFunc) mozilla_proxy_ignore_notifier },

    { NULL, NULL }
};

static gboolean
mozilla_prefs_set_string(const char *preference_name, const char *new_value)
{
        g_return_val_if_fail (preference_name != NULL, FALSE);
        g_return_val_if_fail (new_value != NULL, FALSE);
        nsCOMPtr<nsIPrefService> prefService = 
                                do_GetService (NS_PREFSERVICE_CONTRACTID);
        nsCOMPtr<nsIPrefBranch> pref;
        prefService->GetBranch ("", getter_AddRefs(pref));

        if (pref)
        {
        nsresult rv = pref->SetCharPref (preference_name, new_value);            
                return NS_SUCCEEDED (rv) ? TRUE : FALSE;
        }

        return FALSE;
}

static gboolean
mozilla_prefs_set_boolean (const char *preference_name,
                           gboolean new_boolean_value)
{
        g_return_val_if_fail (preference_name != NULL, FALSE);
  
        nsCOMPtr<nsIPrefService> prefService = 
                                do_GetService (NS_PREFSERVICE_CONTRACTID);
        nsCOMPtr<nsIPrefBranch> pref;
        prefService->GetBranch ("", getter_AddRefs(pref));
  
        if (pref)
        {
                nsresult rv = pref->SetBoolPref (preference_name,
                                new_boolean_value ? PR_TRUE : PR_FALSE);
                return NS_SUCCEEDED (rv) ? TRUE : FALSE;
        }
        return FALSE;
}

static gboolean
mozilla_prefs_set_int (const char *preference_name, int new_int_value)
{
        g_return_val_if_fail (preference_name != NULL, FALSE);

        nsCOMPtr<nsIPrefService> prefService = 
                                do_GetService (NS_PREFSERVICE_CONTRACTID);
        nsCOMPtr<nsIPrefBranch> pref;
        prefService->GetBranch ("", getter_AddRefs(pref));

        if (pref)
        {
                nsresult rv = pref->SetIntPref (preference_name, new_int_value);
                return NS_SUCCEEDED (rv) ? TRUE : FALSE;
        }

        return FALSE;
}

static void
mozilla_cache_size_notifier (GConfClient *client,
                     guint cnxn_id,
                     GConfEntry *entry,
                     char *pref)
{
    int cache_size;

    cache_size = eel_gconf_get_integer (entry->key) * 1024;

    mozilla_prefs_set_int ("browser.cache.disk.capacity", cache_size);
}

static void
mozilla_font_size_notifier (GConfClient *client,
                    guint cnxn_id,
                    GConfEntry *entry,
                    char *pref)
{
    char key[255];
    
    if (entry->value == NULL) return;

    sprintf (key, "font.%s", pref);

    mozilla_prefs_set_int (key, eel_gconf_get_integer (entry->key));
}

static void
mozilla_proxy_mode_notifier (GConfClient *client,
                     guint cnxn_id,
                     GConfEntry *entry,
                     EphyEmbedSingle *single)
{
    char *mode;
    int mozilla_mode = 0;
    
    mode = eel_gconf_get_string (entry->key);
    if (mode == NULL) return;
    
    if (strcmp (mode, "manual") == 0)
    {
        mozilla_mode = 1;
    }
    else if (strcmp (mode, "auto") == 0)
    {
        mozilla_mode = 2;
    }

    mozilla_prefs_set_int ("network.proxy.type", mozilla_mode);

    g_free (mode);
}

static void
mozilla_cookies_accept_notifier (GConfClient *client,
                         guint cnxn_id,
                         GConfEntry *entry,
                         char *pref)
{
    char *mode;
    int mozilla_mode = 0;
    
    mode = eel_gconf_get_string (entry->key);
    if (mode == NULL) return;
    
    if (strcmp (mode, "anywhere") == 0)
    {
        mozilla_mode = 0;
    }
    else if (strcmp (mode, "current site") == 0)
    {
        mozilla_mode = 1;
    }
    else if (strcmp (mode, "nowhere") == 0)
    {
        mozilla_mode = 2;
    }

    mozilla_prefs_set_int ("network.cookie.cookieBehavior", mozilla_mode);

    g_free (mode);
}

static void
mozilla_font_notifier (GConfClient *client,
               guint cnxn_id,
               GConfEntry *entry,
               char *pref)
{
    char key[255];
    char *name;

    if (entry->value == NULL) return;
    
    sprintf (key, "font.name.%s", pref);

    name = eel_gconf_get_string (entry->key);
    if (name)
    {
        mozilla_prefs_set_string (key, name);
        g_free (name);
    }
}

static void
mozilla_proxy_autoconfig_notifier (GConfClient *client,
                           guint cnxn_id,
                       GConfEntry *entry,
                       EphyEmbedSingle *single)
{
    char *url;

    url = eel_gconf_get_string (entry->key);

    if (url)
    {
        ephy_embed_single_load_proxy_autoconf (single, url);
    }

    g_free (url);
}

static void
add_notification_and_notify (GConfClient        *client,
                 const char         *key,
                 GConfClientNotifyFunc   func,
                 gpointer            user_data)
{
    GConfEntry *entry;
    GError *error = NULL;
    guint cnxn_id;

    cnxn_id = gconf_client_notify_add (client, key, func, user_data, NULL, &error);
    if (eel_gconf_handle_error (&error))
    {
        if (cnxn_id != EEL_GCONF_UNDEFINED_CONNECTION)
        {
            gconf_client_notify_remove (client, cnxn_id);
        }
        return;
    }

    mozilla_notifiers = g_list_append (mozilla_notifiers,
                               GUINT_TO_POINTER (cnxn_id));

    gconf_client_notify (client, key);
}

#ifdef MIGRATE_PIXEL_SIZE

#define INT_ROUND(a) gint((a) + 0.5f)

/**
 *  This function gets the dpi in the same way that mozilla gets the dpi, 
 *  this allows us to convert from pixels to points easily
 */
static gint
mozilla_get_dpi ()
{
    GtkSettings* settings = gtk_settings_get_default ();
    gint dpi = 0;
 
    /* Use the gdk-xft-dpi setting if it is set */
    if (g_object_class_find_property (G_OBJECT_GET_CLASS (G_OBJECT (settings)),
                      "gtk-xft-dpi"))
    {
        g_object_get (G_OBJECT (settings), "gtk-xft-dpi", &dpi, NULL);
        if (dpi) return INT_ROUND (dpi / PANGO_SCALE);
    }

    /* Fall back to what xft thinks it is */
    char *val = XGetDefault (GDK_DISPLAY (), "Xft", "dpi");
    if (val)
    {
        char *e;
        double d = strtod(val, &e);
        if (e != val) return INT_ROUND (d);
    }
    
    /* Fall back to calculating manually from the gdk screen settings */
    float screenWidthIn = float (gdk_screen_width_mm()) / 25.4f;
    return INT_ROUND (gdk_screen_width() / screenWidthIn);
}

static void
mozilla_migrate_font_gconf_key (const char *pixel_key, const char *point_key)
{
    int size;

    size = eel_gconf_get_integer (pixel_key);

    if (size > 0)
    {
        /* Use doubles to get more accurate arithmetic */
        double dpi   = (double)mozilla_get_dpi ();
        double value = (double)eel_gconf_get_integer (pixel_key);
        gint point = INT_ROUND ((value * 72) / dpi);

        eel_gconf_set_integer (point_key, point);
    }
}

#endif

void 
mozilla_notifiers_init (EphyEmbedSingle *single) 
{
    GConfClient *client = eel_gconf_client_get_global ();
    guint i;
    const EphyFontsLanguageInfo *font_languages;
    guint n_font_languages;

    eel_gconf_monitor_add ("/apps/epiphany/web");
    eel_gconf_monitor_add ("/system/proxy");

#ifdef MIGRATE_PIXEL_SIZE
    gboolean migrate_size;

    migrate_size = (eel_gconf_get_integer (CONF_SCHEMA_VERSION)
            < EPIPHANY_SCHEMA_VERSION);
    if (migrate_size)
    {
        eel_gconf_set_integer (CONF_SCHEMA_VERSION, EPIPHANY_SCHEMA_VERSION);
    }
#endif

    for (i = 0; conversion_table[i].gconf_key != NULL; i++)
    {
        GConfClientNotifyFunc func = NULL;

        switch (conversion_table[i].pref_type)
        {
        case INT_PREF:
            func = (GConfClientNotifyFunc) generic_mozilla_int_notifier;
            break;
        case BOOL_PREF:
            func = (GConfClientNotifyFunc) generic_mozilla_bool_notifier;
            break;
        case STRING_PREF:
            func = (GConfClientNotifyFunc) generic_mozilla_string_notifier;
            break;
        }

        g_assert (func != NULL);
        
        add_notification_and_notify
            (client,
             conversion_table[i].gconf_key,
             func,
             (gpointer)conversion_table[i].mozilla_key);
    }

    for (i = 0; custom_notifiers[i].gconf_key != NULL; i++)
    {
        add_notification_and_notify
            (client,
             custom_notifiers[i].gconf_key,
             custom_notifiers[i].func,
             (gpointer)single);
    }

    /* fonts notifiers */
    font_languages = ephy_font_languages ();
    n_font_languages = ephy_font_n_languages ();

    for (i=0; i < n_font_languages; i++)
    {
        const char *code = font_languages[i].code;
        guint k;
        char *types [] = { "variable", "monospace" };
        char key[255];
        char *info;
#ifdef MIGRATE_PIXEL_SIZE
        char old_key[255];
#endif
        
        for (k = 0; k < G_N_ELEMENTS (types); k++)
        {
            info = g_strconcat (types[k], ".", code, NULL);
            
            g_snprintf (key, 255, "%s_%s_%s", CONF_RENDERING_FONT, 
                    types[k], code);
            add_notification_and_notify (client, key,
                             (GConfClientNotifyFunc)mozilla_font_notifier,
                             info);
            font_infos = g_list_prepend (font_infos, info);
        }

#ifdef MIGRATE_PIXEL_SIZE
                if (migrate_size)
                {
            char *type;

            type = eel_gconf_get_string (CONF_RENDERING_FONT_TYPE_OLD);
            if (type && (strcmp (type, "serif") == 0 ||
                     strcmp (type, "sans-serif") == 0))
            {
                char *family;

                g_snprintf (old_key, 255, "%s_%s_%s",
                        CONF_RENDERING_FONT, type, code);
                g_snprintf (key, 255, "%s_%s_%s",
                        CONF_RENDERING_FONT, "variable", code);

                family = eel_gconf_get_string (old_key);
                if (family)
                {
                    eel_gconf_set_string (key, family);
                    g_free (family);
                }
            }

            g_free (type);
        }
#endif

        g_snprintf (key, 255, "%s_%s", CONF_RENDERING_FONT_MIN_SIZE, code);
        info = g_strconcat ("minimum-size", ".", code, NULL);
        add_notification_and_notify (client, key,
                         (GConfClientNotifyFunc)mozilla_font_size_notifier,
                         info);
        font_infos = g_list_prepend (font_infos, info);

#ifdef MIGRATE_PIXEL_SIZE
        if (migrate_size)
        {
            g_snprintf (old_key, 255, "%s_%s",
                    CONF_RENDERING_FONT_MIN_SIZE_OLD, code);
            mozilla_migrate_font_gconf_key (old_key, key);
        }
#endif

        g_snprintf (key, 255, "%s_%s", CONF_RENDERING_FONT_FIXED_SIZE, code);
        info = g_strconcat ("size.fixed", ".", code, NULL);
        add_notification_and_notify (client, key,
                         (GConfClientNotifyFunc)mozilla_font_size_notifier,
                         info);
        font_infos = g_list_prepend (font_infos, info);

#ifdef MIGRATE_PIXEL_SIZE
        if (migrate_size)
        {
            g_snprintf (old_key, 255, "%s_%s",
                    CONF_RENDERING_FONT_FIXED_SIZE_OLD, code);
            mozilla_migrate_font_gconf_key (old_key, key);
        }
#endif

        g_snprintf (key, 255, "%s_%s", CONF_RENDERING_FONT_VAR_SIZE, code);
        info = g_strconcat ("size.variable", ".", code, NULL);
        add_notification_and_notify (client, key,
                         (GConfClientNotifyFunc)mozilla_font_size_notifier,
                         info);
        font_infos = g_list_prepend (font_infos, info);

#ifdef MIGRATE_PIXEL_SIZE
        if (migrate_size)
        {
            g_snprintf (old_key, 255, "%s_%s",
                    CONF_RENDERING_FONT_VAR_SIZE_OLD, code);
            mozilla_migrate_font_gconf_key (old_key, key);
        }
#endif
    }
}

void 
mozilla_notifiers_free (void)
{
    eel_gconf_monitor_remove ("/apps/epiphany/web");
    eel_gconf_monitor_remove ("/system/proxy");

    g_list_foreach (mozilla_notifiers, 
                (GFunc)eel_gconf_notification_remove, 
                NULL);
    g_list_free(mozilla_notifiers);

    g_list_foreach (font_infos, (GFunc) g_free, NULL);
    g_list_free (font_infos);
}

/**
 * generic_mozilla_string_notify: update mozilla pref to match epiphany prefs.
 *  user_data should match the mozilla key
 */
static void
generic_mozilla_string_notifier(GConfClient *client,
                guint cnxn_id,
                GConfEntry *entry,
                const char *pref_name)
{
    char *value;

    value = eel_gconf_get_string (entry->key);
    if (value)
    {
        mozilla_prefs_set_string (pref_name, value);
        g_free (value);
    }
}


/**
 * generic_mozilla_int_notify: update mozilla pref to match epiphany prefs.
 *  user_data should match the mozilla key
 */
static void
generic_mozilla_int_notifier(GConfClient *client,
                 guint cnxn_id,
                 GConfEntry *entry,
                 const char *pref_name)
{
    int value;

    value = eel_gconf_get_integer (entry->key);
    mozilla_prefs_set_int (pref_name, value);
}


/**
 * generic_mozilla_bool_notify: update mozilla pref to match epiphany prefs.
 *  user_data should match the mozilla key
 */
static void
generic_mozilla_bool_notifier(GConfClient *client,
                  guint cnxn_id,
                  GConfEntry *entry,
                  const char *pref_name)
{
    gboolean value;

    value = eel_gconf_get_boolean (entry->key);
    mozilla_prefs_set_boolean (pref_name, value);
}

static void
mozilla_own_colors_notifier(GConfClient *client,
                guint cnxn_id,
                GConfEntry *entry,
                EphyEmbedSingle *single)
{
    gboolean value;

    value = eel_gconf_get_boolean (entry->key);
    mozilla_prefs_set_boolean ("browser.display.use_document_colors", !value);
}

static void
mozilla_own_fonts_notifier(GConfClient *client,
               guint cnxn_id,
               GConfEntry *entry,
               EphyEmbedSingle *single)
{
    int value;

    value = eel_gconf_get_boolean (entry->key) ? 0 : 1;
    mozilla_prefs_set_int("browser.display.use_document_fonts", value);
}

static void
mozilla_allow_popups_notifier(GConfClient *client,
                  guint cnxn_id,
                  GConfEntry *entry,
                  EphyEmbedSingle *single)
{
    gboolean value;

    value = eel_gconf_get_boolean (entry->key);
    mozilla_prefs_set_boolean ("dom.disable_open_during_load", !value);
}

static char *
get_system_language ()
{
    const GList *sys_langs;
    const char *lang;

    /**
     * This is a comma separated list of language ranges, as specified
     * by RFC 2616, 14.4.
     * Always include the basic language code last.
     *
     * Examples:
     * "pt"    translation: "pt"
     * "pt_BR" translation: "pt-br,pt"
     * "zh_CN" translation: "zh-cn,zh"
     * "zh_HK" translation: "zh-hk,zh" or maybe "zh-hk,zh-tw,zh"
     */
    lang = _("system-language");
    
    if (strncmp (lang, "system-language", 15) != 0)
    {
        /* the l10n has it */
        return g_strdup (lang);
    }
    
    sys_langs = gnome_i18n_get_language_list ("LC_MESSAGES");

    if (sys_langs)
    {
        char *lang = (char *)sys_langs->data;

        /* FIXME this probably need to be smarter */
        if (strcmp (lang, "C") != 0)
        {
            return g_strndup (lang, 2);
        }
    }

    return g_strdup ("en");
}

static void
mozilla_language_notifier(GConfClient *client,
              guint cnxn_id,
              GConfEntry *entry,
              EphyEmbedSingle *single)
{
    GSList *languages, *l;
    GString *result;

    languages = eel_gconf_get_string_list (CONF_RENDERING_LANGUAGE);
    if (languages == NULL) return;

    result = g_string_new ("");

    for (l = languages; l != NULL; l = l->next)
    {
        char *lang = (char *)l->data;

        if (strcmp (lang, "system") == 0)
        {
            char *sys_lang;
            
            sys_lang = get_system_language ();
            if (sys_lang)
            {
                g_string_append (result, sys_lang);
                g_free (sys_lang);
            }
        }
        else
        {
            g_string_append (result, (char *)l->data);
        }

        if (l->next) g_string_append (result, ",");
    }
    
    mozilla_prefs_set_string ("intl.accept_languages", result->str);

    g_string_free (result, TRUE);
    
    g_slist_foreach (languages, (GFunc) g_free, NULL);
    g_slist_free (languages);
}

static void
mozilla_proxy_ignore_notifier (GConfClient *client,
                       guint cnxn_id,
                       GConfEntry *entry,
                       EphyEmbedSingle *single)
{
    GSList *hosts, *l;
    char **strings, *mozilla_ignore_list;
    int i = 0;

    hosts = eel_gconf_get_string_list (entry->key);

    strings = g_new (gchar*, g_slist_length (hosts) + 1);
    for (l = hosts; l != NULL; l = l->next)
    {
        char *item = (char *) l->data;

        if (item && item[0] != '\0')
        {
            strings[i] = item;
            i++;
        }
    }
    strings[i] = NULL;

    mozilla_ignore_list = g_strjoinv (", ", strings);
    mozilla_prefs_set_string (MOZILLA_PREF_NO_PROXIES,
                  mozilla_ignore_list);

    g_free (mozilla_ignore_list);
    g_free (strings);
    g_slist_foreach (hosts, (GFunc) g_free, NULL);
    g_slist_free (hosts);
}