Imported Upstream version 1.24
[platform/upstream/connman.git] / vpn / vpn-provider.c
index 513d926..c39ebf9 100644 (file)
@@ -2,7 +2,7 @@
  *
  *  ConnMan VPN daemon
  *
- *  Copyright (C) 2012  Intel Corporation. All rights reserved.
+ *  Copyright (C) 2012-2013  Intel Corporation. All rights reserved.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as
@@ -42,7 +42,7 @@ static DBusConnection *connection;
 static GHashTable *provider_hash;
 static GSList *driver_list;
 static int configuration_count;
-static gboolean handle_routes;
+static bool handle_routes;
 
 struct vpn_route {
        int family;
@@ -52,8 +52,8 @@ struct vpn_route {
 };
 
 struct vpn_setting {
-       gboolean hide_value;
-       gboolean immutable;
+       bool hide_value;
+       bool immutable;
        char *value;
 };
 
@@ -83,7 +83,7 @@ struct vpn_provider {
        guint notify_id;
        char *config_file;
        char *config_entry;
-       connman_bool_t immutable;
+       bool immutable;
 };
 
 static void append_properties(DBusMessageIter *iter,
@@ -116,7 +116,7 @@ static void append_route(DBusMessageIter *iter, void *user_data)
 
        connman_dbus_dict_open(iter, &item);
 
-       if (route == NULL)
+       if (!route)
                goto empty_dict;
 
        if (route->family == AF_INET)
@@ -128,15 +128,15 @@ static void append_route(DBusMessageIter *iter, void *user_data)
                connman_dbus_dict_append_basic(&item, "ProtocolFamily",
                                        DBUS_TYPE_INT32, &family);
 
-       if (route->network != NULL)
+       if (route->network)
                connman_dbus_dict_append_basic(&item, "Network",
                                        DBUS_TYPE_STRING, &route->network);
 
-       if (route->netmask != NULL)
+       if (route->netmask)
                connman_dbus_dict_append_basic(&item, "Netmask",
                                        DBUS_TYPE_STRING, &route->netmask);
 
-       if (route->gateway != NULL)
+       if (route->gateway)
                connman_dbus_dict_append_basic(&item, "Gateway",
                                        DBUS_TYPE_STRING, &route->gateway);
 
@@ -150,14 +150,14 @@ static void append_routes(DBusMessageIter *iter, void *user_data)
        GHashTableIter hash;
        gpointer value, key;
 
-       if (routes == NULL) {
+       if (!routes) {
                append_route(iter, NULL);
                return;
        }
 
        g_hash_table_iter_init(&hash, routes);
 
-       while (g_hash_table_iter_next(&hash, &key, &value) == TRUE) {
+       while (g_hash_table_iter_next(&hash, &key, &value)) {
                DBusMessageIter dict;
 
                dbus_message_iter_open_container(iter, DBUS_TYPE_STRUCT, NULL,
@@ -211,14 +211,17 @@ static GSList *read_route_dict(GSList *routes, DBusMessageIter *dicts)
                type = dbus_message_iter_get_arg_type(&value);
 
                switch (type) {
-               case DBUS_TYPE_STRING:
-                       if (g_str_equal(key, "ProtocolFamily") == TRUE)
+               case DBUS_TYPE_INT32:
+                       if (g_str_equal(key, "ProtocolFamily"))
                                dbus_message_iter_get_basic(&value, &family);
-                       else if (g_str_equal(key, "Network") == TRUE)
+                       break;
+
+               case DBUS_TYPE_STRING:
+                       if (g_str_equal(key, "Network"))
                                dbus_message_iter_get_basic(&value, &network);
-                       else if (g_str_equal(key, "Netmask") == TRUE)
+                       else if (g_str_equal(key, "Netmask"))
                                dbus_message_iter_get_basic(&value, &netmask);
-                       else if (g_str_equal(key, "Gateway") == TRUE)
+                       else if (g_str_equal(key, "Gateway"))
                                dbus_message_iter_get_basic(&value, &gateway);
                        break;
                }
@@ -229,13 +232,13 @@ static GSList *read_route_dict(GSList *routes, DBusMessageIter *dicts)
        DBG("family %d network %s netmask %s gateway %s", family,
                network, netmask, gateway);
 
-       if (network == NULL || netmask == NULL) {
+       if (!network || !netmask) {
                DBG("Ignoring route as network/netmask is missing");
                return routes;
        }
 
        route = g_try_new(struct vpn_route, 1);
-       if (route == NULL) {
+       if (!route) {
                g_slist_free_full(routes, free_route);
                return NULL;
        }
@@ -307,7 +310,7 @@ static void set_user_networks(struct vpn_provider *provider, GSList *networks)
 {
        GSList *list;
 
-       for (list = networks; list != NULL; list = g_slist_next(list)) {
+       for (list = networks; list; list = g_slist_next(list)) {
                struct vpn_route *route = list->data;
 
                if (__vpn_provider_append_user_route(provider,
@@ -323,8 +326,8 @@ static void del_routes(struct vpn_provider *provider)
        gpointer value, key;
 
        g_hash_table_iter_init(&hash, provider->user_routes);
-       while (handle_routes == TRUE && g_hash_table_iter_next(&hash,
-                                               &key, &value) == TRUE) {
+       while (handle_routes && g_hash_table_iter_next(&hash,
+                                               &key, &value)) {
                struct vpn_route *route = value;
                if (route->family == AF_INET6) {
                        unsigned char prefixlen = atoi(route->netmask);
@@ -346,7 +349,7 @@ static void send_value(const char *path, const char *key, const char *value)
        const char *empty = "";
        const char *str;
 
-       if (value != NULL)
+       if (value)
                str = value;
        else
                str = empty;
@@ -388,7 +391,7 @@ static DBusMessage *get_properties(DBusConnection *conn,
        DBG("provider %p", provider);
 
        reply = dbus_message_new_method_return(msg);
-       if (reply == NULL)
+       if (!reply)
                return NULL;
 
        dbus_message_iter_init_append(reply, &array);
@@ -408,10 +411,10 @@ static DBusMessage *set_property(DBusConnection *conn, DBusMessage *msg,
 
        DBG("conn %p", conn);
 
-       if (provider->immutable == TRUE)
+       if (provider->immutable)
                return __connman_error_not_supported(msg);
 
-       if (dbus_message_iter_init(msg, &iter) == FALSE)
+       if (!dbus_message_iter_init(msg, &iter))
                return __connman_error_invalid_arguments(msg);
 
        if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
@@ -427,19 +430,19 @@ static DBusMessage *set_property(DBusConnection *conn, DBusMessage *msg,
 
        type = dbus_message_iter_get_arg_type(&value);
 
-       if (g_str_equal(name, "UserRoutes") == TRUE) {
+       if (g_str_equal(name, "UserRoutes")) {
                GSList *networks;
 
                if (type != DBUS_TYPE_ARRAY)
                        return __connman_error_invalid_arguments(msg);
 
                networks = get_user_networks(&value);
-               if (networks != NULL) {
+               if (networks) {
                        del_routes(provider);
                        provider->user_networks = networks;
                        set_user_networks(provider, provider->user_networks);
 
-                       if (handle_routes == FALSE)
+                       if (!handle_routes)
                                send_routes(provider, provider->user_routes,
                                                                "UserRoutes");
                }
@@ -461,18 +464,18 @@ static DBusMessage *clear_property(DBusConnection *conn, DBusMessage *msg,
 
        DBG("conn %p", conn);
 
-       if (provider->immutable == TRUE)
+       if (provider->immutable)
                return __connman_error_not_supported(msg);
 
        dbus_message_get_args(msg, NULL, DBUS_TYPE_STRING, &name,
                                                        DBUS_TYPE_INVALID);
 
-       if (g_str_equal(name, "UserRoutes") == TRUE) {
+       if (g_str_equal(name, "UserRoutes")) {
                del_routes(provider);
 
-               if (handle_routes == FALSE)
+               if (!handle_routes)
                        send_routes(provider, provider->user_routes, name);
-       } else if (vpn_provider_get_string(provider, name) != NULL) {
+       } else if (vpn_provider_get_string(provider, name)) {
                vpn_provider_set_string(provider, name, NULL);
        } else {
                return __connman_error_invalid_property(msg);
@@ -539,7 +542,7 @@ static void resolv_result(GResolvResultStatus status,
 
        DBG("status %d", status);
 
-       if (status == G_RESOLV_RESULT_STATUS_SUCCESS && results != NULL &&
+       if (status == G_RESOLV_RESULT_STATUS_SUCCESS && results &&
                                                g_strv_length(results) > 0)
                provider->host_ip = g_strdupv(results);
 
@@ -548,13 +551,13 @@ static void resolv_result(GResolvResultStatus status,
 
 static void provider_resolv_host_addr(struct vpn_provider *provider)
 {
-       if (provider->host == NULL)
+       if (!provider->host)
                return;
 
        if (connman_inet_check_ipaddress(provider->host) > 0)
                return;
 
-       if (provider->host_ip != NULL)
+       if (provider->host_ip)
                return;
 
        /*
@@ -564,7 +567,7 @@ static void provider_resolv_host_addr(struct vpn_provider *provider)
         * the IP address also before VPN connection can be established.
         */
        provider->resolv = g_resolv_new(0);
-       if (provider->resolv == NULL) {
+       if (!provider->resolv) {
                DBG("Cannot resolv %s", provider->host);
                return;
        }
@@ -580,15 +583,15 @@ static void provider_resolv_host_addr(struct vpn_provider *provider)
 void __vpn_provider_append_properties(struct vpn_provider *provider,
                                                        DBusMessageIter *iter)
 {
-       if (provider->host != NULL)
+       if (provider->host)
                connman_dbus_dict_append_basic(iter, "Host",
                                        DBUS_TYPE_STRING, &provider->host);
 
-       if (provider->domain != NULL)
+       if (provider->domain)
                connman_dbus_dict_append_basic(iter, "Domain",
                                        DBUS_TYPE_STRING, &provider->domain);
 
-       if (provider->type != NULL)
+       if (provider->type)
                connman_dbus_dict_append_basic(iter, "Type", DBUS_TYPE_STRING,
                                                 &provider->type);
 }
@@ -599,15 +602,15 @@ int __vpn_provider_append_user_route(struct vpn_provider *provider,
 {
        struct vpn_route *route;
        char *key = g_strdup_printf("%d/%s/%s/%s", family, network,
-                               netmask, gateway != NULL ? gateway : "");
+                               netmask, gateway ? gateway : "");
 
        DBG("family %d network %s netmask %s gw %s", family, network,
                                                        netmask, gateway);
 
        route = g_hash_table_lookup(provider->user_routes, key);
-       if (route == NULL) {
+       if (!route) {
                route = g_try_new0(struct vpn_route, 1);
-               if (route == NULL) {
+               if (!route) {
                        connman_error("out of memory");
                        return -ENOMEM;
                }
@@ -631,23 +634,23 @@ static struct vpn_route *get_route(char *route_str)
        int family = PF_UNSPEC;
        struct vpn_route *route = NULL;
 
-       if (elems == NULL)
+       if (!elems)
                return NULL;
 
        family_str = elems[0];
 
        network = elems[1];
-       if (network == NULL || network[0] == '\0')
+       if (!network || network[0] == '\0')
                goto out;
 
        netmask = elems[2];
-       if (netmask == NULL || netmask[0] == '\0')
+       if (!netmask || netmask[0] == '\0')
                goto out;
 
        gateway = elems[3];
 
        route = g_try_new0(struct vpn_route, 1);
-       if (route == NULL)
+       if (!route)
                goto out;
 
        if (family_str[0] == '\0' || atoi(family_str) == 0) {
@@ -663,20 +666,20 @@ static struct vpn_route *get_route(char *route_str)
                }
        }
 
-       if (g_strrstr(network, ":") != NULL) {
+       if (g_strrstr(network, ":")) {
                if (family != PF_UNSPEC && family != AF_INET6)
                        DBG("You have IPv6 address but you have non IPv6 route");
-       } else if (g_strrstr(network, ".") != NULL) {
+       } else if (g_strrstr(network, ".")) {
                if (family != PF_UNSPEC && family != AF_INET)
                        DBG("You have IPv4 address but you have non IPv4 route");
 
-               if (g_strrstr(netmask, ".") == NULL) {
+               if (!g_strrstr(netmask, ".")) {
                        /* We have netmask length */
                        in_addr_t addr;
                        struct in_addr netmask_in;
                        unsigned char prefix_len = 32;
 
-                       if (netmask != NULL) {
+                       if (netmask) {
                                char *ptr;
                                long int value = strtol(netmask, &ptr, 10);
                                if (ptr != netmask && *ptr == '\0' &&
@@ -714,9 +717,9 @@ static GSList *get_routes(gchar **networks)
        GSList *routes = NULL;
        int i;
 
-       for (i = 0; networks[i] != NULL; i++) {
+       for (i = 0; networks[i]; i++) {
                route = get_route(networks[i]);
-               if (route != NULL)
+               if (route)
                        routes = g_slist_prepend(routes, route);
        }
 
@@ -734,16 +737,16 @@ static int provider_load_from_keyfile(struct vpn_provider *provider,
 
        settings = g_key_file_get_keys(keyfile, provider->identifier, &length,
                                NULL);
-       if (settings == NULL) {
+       if (!settings) {
                g_key_file_free(keyfile);
                return -ENOENT;
        }
 
        while (idx < length) {
                key = settings[idx];
-               if (key != NULL) {
-                       if (g_str_equal(key, "Networks") == TRUE) {
-                               networks = g_key_file_get_string_list(keyfile,
+               if (key) {
+                       if (g_str_equal(key, "Networks")) {
+                               networks = __vpn_config_get_string_list(keyfile,
                                                provider->identifier,
                                                key,
                                                &num_user_networks,
@@ -751,7 +754,7 @@ static int provider_load_from_keyfile(struct vpn_provider *provider,
                                provider->user_networks = get_routes(networks);
 
                        } else {
-                               value = g_key_file_get_string(keyfile,
+                               value = __vpn_config_get_string(keyfile,
                                                        provider->identifier,
                                                        key, NULL);
                                vpn_provider_set_string(provider, key,
@@ -764,7 +767,7 @@ static int provider_load_from_keyfile(struct vpn_provider *provider,
        g_strfreev(settings);
        g_strfreev(networks);
 
-       if (provider->user_networks != NULL)
+       if (provider->user_networks)
                set_user_networks(provider, provider->user_networks);
 
        return 0;
@@ -778,7 +781,7 @@ static int vpn_provider_load(struct vpn_provider *provider)
        DBG("provider %p", provider);
 
        keyfile = __connman_storage_load_provider(provider->identifier);
-       if (keyfile == NULL)
+       if (!keyfile)
                return -ENOENT;
 
        provider_load_from_keyfile(provider, keyfile);
@@ -793,13 +796,13 @@ static gchar **create_network_list(GSList *networks, gsize *count)
        gchar **result = NULL;
        unsigned int num_elems = 0;
 
-       for (list = networks; list != NULL; list = g_slist_next(list)) {
+       for (list = networks; list; list = g_slist_next(list)) {
                struct vpn_route *route = list->data;
                int family;
 
                result = g_try_realloc(result,
                                (num_elems + 1) * sizeof(gchar *));
-               if (result == NULL)
+               if (!result)
                        return NULL;
 
                switch (route->family) {
@@ -816,13 +819,13 @@ static gchar **create_network_list(GSList *networks, gsize *count)
 
                result[num_elems] = g_strdup_printf("%d/%s/%s/%s",
                                family, route->network, route->netmask,
-                               route->gateway == NULL ? "" : route->gateway);
+                               !route->gateway ? "" : route->gateway);
 
                num_elems++;
        }
 
        result = g_try_realloc(result, (num_elems + 1) * sizeof(gchar *));
-       if (result == NULL)
+       if (!result)
                return NULL;
 
        result[num_elems] = NULL;
@@ -837,7 +840,7 @@ static int vpn_provider_save(struct vpn_provider *provider)
        DBG("provider %p immutable %s", provider,
                                        provider->immutable ? "yes" : "no");
 
-       if (provider->immutable == TRUE) {
+       if (provider->immutable) {
                /*
                 * Do not save providers that are provisioned via .config
                 * file.
@@ -846,7 +849,7 @@ static int vpn_provider_save(struct vpn_provider *provider)
        }
 
        keyfile = g_key_file_new();
-       if (keyfile == NULL)
+       if (!keyfile)
                return -ENOMEM;
 
        g_key_file_set_string(keyfile, provider->identifier,
@@ -857,13 +860,13 @@ static int vpn_provider_save(struct vpn_provider *provider)
                        "Host", provider->host);
        g_key_file_set_string(keyfile, provider->identifier,
                        "VPN.Domain", provider->domain);
-       if (provider->user_networks != NULL) {
+       if (provider->user_networks) {
                gchar **networks;
                gsize network_count;
 
                networks = create_network_list(provider->user_networks,
                                                        &network_count);
-               if (networks != NULL) {
+               if (networks) {
                        g_key_file_set_string_list(keyfile,
                                                provider->identifier,
                                                "Networks",
@@ -873,20 +876,20 @@ static int vpn_provider_save(struct vpn_provider *provider)
                }
        }
 
-       if (provider->config_file != NULL && strlen(provider->config_file) > 0)
+       if (provider->config_file && strlen(provider->config_file) > 0)
                g_key_file_set_string(keyfile, provider->identifier,
                                "Config.file", provider->config_file);
 
-       if (provider->config_entry != NULL &&
+       if (provider->config_entry &&
                                        strlen(provider->config_entry) > 0)
                g_key_file_set_string(keyfile, provider->identifier,
                                "Config.ident", provider->config_entry);
 
-       if (provider->driver != NULL && provider->driver->save != NULL)
+       if (provider->driver && provider->driver->save)
                provider->driver->save(provider, keyfile);
 
        __connman_storage_save_provider(keyfile, provider->identifier);
-        g_key_file_free(keyfile);
+       g_key_file_free(keyfile);
 
        return 0;
 }
@@ -900,13 +903,13 @@ struct vpn_provider *__vpn_provider_lookup(const char *identifier)
        return provider;
 }
 
-static gboolean match_driver(struct vpn_provider *provider,
+static bool match_driver(struct vpn_provider *provider,
                                struct vpn_provider_driver *driver)
 {
        if (g_strcmp0(driver->name, provider->type) == 0)
-               return TRUE;
+               return true;
 
-       return FALSE;
+       return false;
 }
 
 static int provider_probe(struct vpn_provider *provider)
@@ -916,24 +919,24 @@ static int provider_probe(struct vpn_provider *provider)
        DBG("provider %p driver %p name %s", provider, provider->driver,
                                                provider->name);
 
-       if (provider->driver != NULL)
+       if (provider->driver)
                return -EALREADY;
 
        for (list = driver_list; list; list = list->next) {
                struct vpn_provider_driver *driver = list->data;
 
-               if (match_driver(provider, driver) == FALSE)
+               if (!match_driver(provider, driver))
                        continue;
 
                DBG("driver %p name %s", driver, driver->name);
 
-               if (driver->probe != NULL && driver->probe(provider) == 0) {
+               if (driver->probe && driver->probe(provider) == 0) {
                        provider->driver = driver;
                        break;
                }
        }
 
-       if (provider->driver == NULL)
+       if (!provider->driver)
                return -ENODEV;
 
        return 0;
@@ -941,7 +944,7 @@ static int provider_probe(struct vpn_provider *provider)
 
 static void provider_remove(struct vpn_provider *provider)
 {
-       if (provider->driver != NULL) {
+       if (provider->driver) {
                provider->driver->remove(provider);
                provider->driver = NULL;
        }
@@ -987,7 +990,7 @@ static void provider_destruct(struct vpn_provider *provider)
        g_hash_table_destroy(provider->routes);
        g_hash_table_destroy(provider->user_routes);
        g_hash_table_destroy(provider->setting_strings);
-       if (provider->resolv != NULL) {
+       if (provider->resolv) {
                g_resolv_unref(provider->resolv);
                provider->resolv = NULL;
        }
@@ -1035,7 +1038,7 @@ int __vpn_provider_disconnect(struct vpn_provider *provider)
 
        DBG("provider %p", provider);
 
-       if (provider->driver != NULL && provider->driver->disconnect != NULL)
+       if (provider->driver && provider->driver->disconnect)
                err = provider->driver->disconnect(provider);
        else
                return -EOPNOTSUPP;
@@ -1055,7 +1058,7 @@ static void connect_cb(struct vpn_provider *provider, void *user_data,
 
        if (error != 0) {
                DBusMessage *reply = __connman_error_failed(pending, error);
-               if (reply != NULL)
+               if (reply)
                        g_dbus_send_message(connection, reply);
 
                vpn_provider_indicate_error(provider,
@@ -1073,9 +1076,11 @@ int __vpn_provider_connect(struct vpn_provider *provider, DBusMessage *msg)
 
        DBG("provider %p", provider);
 
-       if (provider->driver != NULL && provider->driver->connect != NULL) {
+       if (provider->driver && provider->driver->connect) {
                dbus_message_ref(msg);
-               err = provider->driver->connect(provider, connect_cb, msg);
+               err = provider->driver->connect(provider, connect_cb,
+                                               dbus_message_get_sender(msg),
+                                               msg);
        } else
                return -EOPNOTSUPP;
 
@@ -1092,7 +1097,7 @@ static void connection_removed_signal(struct vpn_provider *provider)
 
        signal = dbus_message_new_signal(VPN_MANAGER_PATH,
                        VPN_MANAGER_INTERFACE, "ConnectionRemoved");
-       if (signal == NULL)
+       if (!signal)
                return;
 
        dbus_message_iter_init_append(signal, &iter);
@@ -1110,7 +1115,7 @@ static char *get_ident(const char *path)
                return NULL;
 
        pos = strrchr(path, '/');
-       if (pos == NULL)
+       if (!pos)
                return NULL;
 
        return pos + 1;
@@ -1126,7 +1131,7 @@ int __vpn_provider_remove(const char *path)
        ident = get_ident(path);
 
        provider = __vpn_provider_lookup(ident);
-       if (provider != NULL)
+       if (provider)
                return __vpn_provider_delete(provider);
 
        return -ENXIO;
@@ -1153,7 +1158,7 @@ static void append_ipv4(DBusMessageIter *iter, void *user_data)
        const char *address, *gateway, *peer;
 
        address = __vpn_ipconfig_get_local(provider->ipconfig_ipv4);
-       if (address != NULL) {
+       if (address) {
                in_addr_t addr;
                struct in_addr netmask;
                char *mask;
@@ -1174,12 +1179,12 @@ static void append_ipv4(DBusMessageIter *iter, void *user_data)
        }
 
        gateway = __vpn_ipconfig_get_gateway(provider->ipconfig_ipv4);
-       if (gateway != NULL)
+       if (gateway)
                connman_dbus_dict_append_basic(iter, "Gateway",
                                                DBUS_TYPE_STRING, &gateway);
 
        peer = __vpn_ipconfig_get_peer(provider->ipconfig_ipv4);
-       if (peer != NULL)
+       if (peer)
                connman_dbus_dict_append_basic(iter, "Peer",
                                                DBUS_TYPE_STRING, &peer);
 }
@@ -1190,7 +1195,7 @@ static void append_ipv6(DBusMessageIter *iter, void *user_data)
        const char *address, *gateway, *peer;
 
        address = __vpn_ipconfig_get_local(provider->ipconfig_ipv6);
-       if (address != NULL) {
+       if (address) {
                unsigned char prefixlen;
 
                connman_dbus_dict_append_basic(iter, "Address",
@@ -1204,12 +1209,12 @@ static void append_ipv6(DBusMessageIter *iter, void *user_data)
        }
 
        gateway = __vpn_ipconfig_get_gateway(provider->ipconfig_ipv6);
-       if (gateway != NULL)
+       if (gateway)
                connman_dbus_dict_append_basic(iter, "Gateway",
                                                DBUS_TYPE_STRING, &gateway);
 
        peer = __vpn_ipconfig_get_peer(provider->ipconfig_ipv6);
-       if (peer != NULL)
+       if (peer)
                connman_dbus_dict_append_basic(iter, "Peer",
                                                DBUS_TYPE_STRING, &peer);
 }
@@ -1240,7 +1245,7 @@ static void append_nameservers(DBusMessageIter *iter, char **servers)
 
        DBG("%p", servers);
 
-       for (i = 0; servers[i] != NULL; i++) {
+       for (i = 0; servers[i]; i++) {
                DBG("servers[%d] %s", i, servers[i]);
                dbus_message_iter_append_basic(iter,
                                        DBUS_TYPE_STRING, &servers[i]);
@@ -1251,7 +1256,7 @@ static void append_dns(DBusMessageIter *iter, void *user_data)
 {
        struct vpn_provider *provider = user_data;
 
-       if (provider->nameservers != NULL)
+       if (provider->nameservers)
                append_nameservers(iter, provider->nameservers);
 }
 
@@ -1263,7 +1268,7 @@ static int provider_indicate_state(struct vpn_provider *provider,
 
        str = state2string(state);
        DBG("provider %p state %s/%d", provider, str, state);
-       if (str == NULL)
+       if (!str)
                return -EINVAL;
 
        old_state = provider->state;
@@ -1289,7 +1294,7 @@ static int provider_indicate_state(struct vpn_provider *provider,
                                                DBUS_TYPE_STRING,
                                                append_dns, provider);
 
-               if (provider->domain != NULL)
+               if (provider->domain)
                        connman_dbus_property_changed_basic(provider->path,
                                                VPN_CONNECTION_INTERFACE,
                                                "Domain",
@@ -1346,31 +1351,33 @@ static void append_properties(DBusMessageIter *iter,
        DBusMessageIter dict;
        GHashTableIter hash;
        gpointer value, key;
+       dbus_bool_t immutable;
 
        connman_dbus_dict_open(iter, &dict);
 
        append_state(&dict, provider);
 
-       if (provider->type != NULL)
+       if (provider->type)
                connman_dbus_dict_append_basic(&dict, "Type",
                                        DBUS_TYPE_STRING, &provider->type);
 
-       if (provider->name != NULL)
+       if (provider->name)
                connman_dbus_dict_append_basic(&dict, "Name",
                                        DBUS_TYPE_STRING, &provider->name);
 
-       if (provider->host != NULL)
+       if (provider->host)
                connman_dbus_dict_append_basic(&dict, "Host",
                                        DBUS_TYPE_STRING, &provider->host);
        if (provider->index >= 0)
                connman_dbus_dict_append_basic(&dict, "Index",
                                        DBUS_TYPE_INT32, &provider->index);
-       if (provider->domain != NULL)
+       if (provider->domain)
                connman_dbus_dict_append_basic(&dict, "Domain",
                                        DBUS_TYPE_STRING, &provider->domain);
 
+       immutable = provider->immutable;
        connman_dbus_dict_append_basic(&dict, "Immutable", DBUS_TYPE_BOOLEAN,
-                                       &provider->immutable);
+                                       &immutable);
 
        if (provider->family == AF_INET)
                connman_dbus_dict_append_dict(&dict, "IPv4", append_ipv4,
@@ -1390,14 +1397,14 @@ static void append_properties(DBusMessageIter *iter,
                                DBUS_TYPE_DICT_ENTRY, append_routes,
                                provider->routes);
 
-       if (provider->setting_strings != NULL) {
+       if (provider->setting_strings) {
                g_hash_table_iter_init(&hash, provider->setting_strings);
 
-               while (g_hash_table_iter_next(&hash, &key, &value) == TRUE) {
+               while (g_hash_table_iter_next(&hash, &key, &value)) {
                        struct vpn_setting *setting = value;
 
-                       if (setting->hide_value == FALSE &&
-                                                       setting->value != NULL)
+                       if (!setting->hide_value &&
+                                                       setting->value)
                                connman_dbus_dict_append_basic(&dict, key,
                                                        DBUS_TYPE_STRING,
                                                        &setting->value);
@@ -1414,7 +1421,7 @@ static void connection_added_signal(struct vpn_provider *provider)
 
        signal = dbus_message_new_signal(VPN_MANAGER_PATH,
                        VPN_MANAGER_INTERFACE, "ConnectionAdded");
-       if (signal == NULL)
+       if (!signal)
                return;
 
        dbus_message_iter_init_append(signal, &iter);
@@ -1426,19 +1433,19 @@ static void connection_added_signal(struct vpn_provider *provider)
        dbus_message_unref(signal);
 }
 
-static connman_bool_t check_host(char **hosts, char *host)
+static bool check_host(char **hosts, char *host)
 {
        int i;
 
-       if (hosts == NULL)
-               return FALSE;
+       if (!hosts)
+               return false;
 
-       for (i = 0; hosts[i] != NULL; i++) {
+       for (i = 0; hosts[i]; i++) {
                if (g_strcmp0(hosts[i], host) == 0)
-                       return TRUE;
+                       return true;
        }
 
-       return FALSE;
+       return false;
 }
 
 static void provider_append_routes(gpointer key, gpointer value,
@@ -1448,7 +1455,7 @@ static void provider_append_routes(gpointer key, gpointer value,
        struct vpn_provider *provider = user_data;
        int index = provider->index;
 
-       if (handle_routes == FALSE)
+       if (!handle_routes)
                return;
 
        /*
@@ -1456,7 +1463,7 @@ static void provider_append_routes(gpointer key, gpointer value,
         * VPN server, then we must discard that because the
         * server cannot be contacted via VPN tunnel.
         */
-       if (check_host(provider->host_ip, route->network) == TRUE) {
+       if (check_host(provider->host_ip, route->network)) {
                DBG("Discarding VPN route to %s via %s at index %d",
                        route->network, route->gateway, index);
                return;
@@ -1476,14 +1483,14 @@ static void provider_append_routes(gpointer key, gpointer value,
 }
 
 static int set_connected(struct vpn_provider *provider,
-                                       connman_bool_t connected)
+                                       bool connected)
 {
        struct vpn_ipconfig *ipconfig;
 
        DBG("provider %p id %s connected %d", provider,
                                        provider->identifier, connected);
 
-       if (connected == TRUE) {
+       if (connected) {
                if (provider->family == AF_INET6)
                        ipconfig = provider->ipconfig_ipv6;
                else
@@ -1491,7 +1498,7 @@ static int set_connected(struct vpn_provider *provider,
 
                __vpn_ipconfig_address_add(ipconfig, provider->family);
 
-               if (handle_routes == TRUE)
+               if (handle_routes)
                        __vpn_ipconfig_gateway_add(ipconfig, provider->family);
 
                provider_indicate_state(provider,
@@ -1517,18 +1524,18 @@ static int set_connected(struct vpn_provider *provider,
 int vpn_provider_set_state(struct vpn_provider *provider,
                                        enum vpn_provider_state state)
 {
-       if (provider == NULL)
+       if (!provider)
                return -EINVAL;
 
        switch (state) {
        case VPN_PROVIDER_STATE_UNKNOWN:
                return -EINVAL;
        case VPN_PROVIDER_STATE_IDLE:
-               return set_connected(provider, FALSE);
+               return set_connected(provider, false);
        case VPN_PROVIDER_STATE_CONNECT:
                return provider_indicate_state(provider, state);
        case VPN_PROVIDER_STATE_READY:
-               return set_connected(provider, TRUE);
+               return set_connected(provider, true);
        case VPN_PROVIDER_STATE_DISCONNECT:
                return provider_indicate_state(provider, state);
        case VPN_PROVIDER_STATE_FAILURE:
@@ -1562,7 +1569,7 @@ static int connection_unregister(struct vpn_provider *provider)
 {
        DBG("provider %p path %s", provider, provider->path);
 
-       if (provider->path == NULL)
+       if (!provider->path)
                return -EALREADY;
 
        g_dbus_unregister_interface(connection, provider->path,
@@ -1578,7 +1585,7 @@ static int connection_register(struct vpn_provider *provider)
 {
        DBG("provider %p path %s", provider, provider->path);
 
-       if (provider->path != NULL)
+       if (provider->path)
                return -EALREADY;
 
        provider->path = g_strdup_printf("%s/connection/%s", VPN_PATH,
@@ -1613,7 +1620,7 @@ static void provider_initialize(struct vpn_provider *provider)
        provider->type = NULL;
        provider->domain = NULL;
        provider->identifier = NULL;
-       provider->immutable = FALSE;
+       provider->immutable = false;
        provider->user_networks = NULL;
        provider->routes = g_hash_table_new_full(g_direct_hash, g_direct_equal,
                                        NULL, free_route);
@@ -1628,7 +1635,7 @@ static struct vpn_provider *vpn_provider_new(void)
        struct vpn_provider *provider;
 
        provider = g_try_new0(struct vpn_provider, 1);
-       if (provider == NULL)
+       if (!provider)
                return NULL;
 
        provider->refcount = 1;
@@ -1644,11 +1651,11 @@ static struct vpn_provider *vpn_provider_get(const char *identifier)
        struct vpn_provider *provider;
 
        provider = g_hash_table_lookup(provider_hash, identifier);
-       if (provider != NULL)
+       if (provider)
                return provider;
 
        provider = vpn_provider_new();
-       if (provider == NULL)
+       if (!provider)
                return NULL;
 
        DBG("provider %p", provider);
@@ -1682,21 +1689,21 @@ static struct vpn_provider *provider_create_from_keyfile(GKeyFile *keyfile,
 {
        struct vpn_provider *provider;
 
-       if (keyfile == NULL || ident == NULL)
+       if (!keyfile || !ident)
                return NULL;
 
        provider = __vpn_provider_lookup(ident);
-       if (provider == NULL) {
+       if (!provider) {
                provider = vpn_provider_get(ident);
-               if (provider == NULL) {
+               if (!provider) {
                        DBG("can not create provider");
                        return NULL;
                }
 
                provider_load_from_keyfile(provider, keyfile);
 
-               if (provider->name == NULL || provider->host == NULL ||
-                               provider->domain == NULL) {
+               if (!provider->name || !provider->host ||
+                               !provider->domain) {
                        DBG("cannot get name, host or domain");
                        vpn_provider_unref(provider);
                        return NULL;
@@ -1719,10 +1726,10 @@ static void provider_create_all_from_type(const char *provider_type)
 
        providers = __connman_storage_get_providers();
 
-       if (providers == NULL)
+       if (!providers)
                return;
 
-       for (i = 0; providers[i] != NULL; i+=1) {
+       for (i = 0; providers[i]; i += 1) {
 
                if (strncmp(providers[i], "provider_", 9) != 0)
                        continue;
@@ -1730,10 +1737,10 @@ static void provider_create_all_from_type(const char *provider_type)
                id = providers[i] + 9;
                keyfile = __connman_storage_load_provider(id);
 
-               if (keyfile == NULL)
+               if (!keyfile)
                        continue;
 
-               type = g_key_file_get_string(keyfile, id, "Type", NULL);
+               type = __vpn_config_get_string(keyfile, id, "Type", NULL);
 
                DBG("keyfile %p id %s type %s", keyfile, id, type);
 
@@ -1743,7 +1750,7 @@ static void provider_create_all_from_type(const char *provider_type)
                        continue;
                }
 
-               if (provider_create_from_keyfile(keyfile, id) == NULL)
+               if (!provider_create_from_keyfile(keyfile, id))
                        DBG("could not create provider");
 
                g_free(type);
@@ -1757,7 +1764,7 @@ char *__vpn_provider_create_identifier(const char *host, const char *domain)
        char *ident;
 
        ident = g_strdup_printf("%s_%s", host, domain);
-       if (ident == NULL)
+       if (!ident)
                return NULL;
 
        provider_dbus_ident(ident);
@@ -1790,18 +1797,18 @@ int __vpn_provider_create(DBusMessage *msg)
 
                switch (dbus_message_iter_get_arg_type(&value)) {
                case DBUS_TYPE_STRING:
-                       if (g_str_equal(key, "Type") == TRUE)
+                       if (g_str_equal(key, "Type"))
                                dbus_message_iter_get_basic(&value, &type);
-                       else if (g_str_equal(key, "Name") == TRUE)
+                       else if (g_str_equal(key, "Name"))
                                dbus_message_iter_get_basic(&value, &name);
-                       else if (g_str_equal(key, "Host") == TRUE)
+                       else if (g_str_equal(key, "Host"))
                                dbus_message_iter_get_basic(&value, &host);
-                       else if (g_str_equal(key, "VPN.Domain") == TRUE ||
-                                       g_str_equal(key, "Domain") == TRUE)
+                       else if (g_str_equal(key, "VPN.Domain") ||
+                                       g_str_equal(key, "Domain"))
                                dbus_message_iter_get_basic(&value, &domain);
                        break;
                case DBUS_TYPE_ARRAY:
-                       if (g_str_equal(key, "UserRoutes") == TRUE)
+                       if (g_str_equal(key, "UserRoutes"))
                                networks = get_user_networks(&value);
                        break;
                }
@@ -1809,21 +1816,21 @@ int __vpn_provider_create(DBusMessage *msg)
                dbus_message_iter_next(&array);
        }
 
-       if (host == NULL || domain == NULL)
+       if (!host || !domain)
                return -EINVAL;
 
        DBG("Type %s name %s networks %p", type, name, networks);
 
-       if (type == NULL || name == NULL)
+       if (!type || !name)
                return -EOPNOTSUPP;
 
        ident = __vpn_provider_create_identifier(host, domain);
        DBG("ident %s", ident);
 
        provider = __vpn_provider_lookup(ident);
-       if (provider == NULL) {
+       if (!provider) {
                provider = vpn_provider_get(ident);
-               if (provider == NULL) {
+               if (!provider) {
                        DBG("can not create provider");
                        g_free(ident);
                        return -EOPNOTSUPP;
@@ -1840,7 +1847,7 @@ int __vpn_provider_create(DBusMessage *msg)
                provider_resolv_host_addr(provider);
        }
 
-       if (networks != NULL) {
+       if (networks) {
                g_slist_free_full(provider->user_networks, free_route);
                provider->user_networks = networks;
                set_user_networks(provider, provider->user_networks);
@@ -1904,25 +1911,25 @@ static GSList *parse_user_networks(const char *network_str)
        char **elems;
        int i = 0;
 
-       if (network_str == NULL)
+       if (!network_str)
                return NULL;
 
        elems = g_strsplit(network_str, ",", 0);
-       if (elems == NULL)
+       if (!elems)
                return NULL;
 
-       while (elems[i] != NULL) {
+       while (elems[i]) {
                struct vpn_route *vpn_route;
                char *network, *netmask, *gateway;
                int family;
                char **route;
 
                route = g_strsplit(elems[i], "/", 0);
-               if (route == NULL)
+               if (!route)
                        goto next;
 
                network = route[0];
-               if (network == NULL || network[0] == '\0')
+               if (!network || network[0] == '\0')
                        goto next;
 
                family = connman_inet_check_ipaddress(network);
@@ -1944,13 +1951,13 @@ static GSList *parse_user_networks(const char *network_str)
                }
 
                netmask = route[1];
-               if (netmask == NULL || netmask[0] == '\0')
+               if (!netmask || netmask[0] == '\0')
                        goto next;
 
                gateway = route[2];
 
                vpn_route = g_try_new0(struct vpn_route, 1);
-               if (vpn_route == NULL) {
+               if (!vpn_route) {
                        g_strfreev(route);
                        break;
                }
@@ -1994,14 +2001,14 @@ int __vpn_provider_create_from_config(GHashTable *settings,
        networks_str = get_string(settings, "Networks");
        networks = parse_user_networks(networks_str);
 
-       if (host == NULL || domain == NULL) {
+       if (!host || !domain) {
                err = -EINVAL;
                goto fail;
        }
 
        DBG("type %s name %s networks %s", type, name, networks_str);
 
-       if (type == NULL || name == NULL) {
+       if (!type || !name) {
                err = -EOPNOTSUPP;
                goto fail;
        }
@@ -2010,9 +2017,9 @@ int __vpn_provider_create_from_config(GHashTable *settings,
        DBG("ident %s", ident);
 
        provider = __vpn_provider_lookup(ident);
-       if (provider == NULL) {
+       if (!provider) {
                provider = vpn_provider_get(ident);
-               if (provider == NULL) {
+               if (!provider) {
                        DBG("can not create provider");
                        err = -EOPNOTSUPP;
                        goto fail;
@@ -2031,7 +2038,7 @@ int __vpn_provider_create_from_config(GHashTable *settings,
                provider_resolv_host_addr(provider);
        }
 
-       if (networks != NULL) {
+       if (networks) {
                g_slist_free_full(provider->user_networks, free_route);
                provider->user_networks = networks;
                set_user_networks(provider, provider->user_networks);
@@ -2039,10 +2046,10 @@ int __vpn_provider_create_from_config(GHashTable *settings,
 
        g_hash_table_iter_init(&hash, settings);
 
-       while (g_hash_table_iter_next(&hash, &key, &value) == TRUE)
+       while (g_hash_table_iter_next(&hash, &key, &value))
                __vpn_provider_set_string_immutable(provider, key, value);
 
-       provider->immutable = TRUE;
+       provider->immutable = true;
 
        vpn_provider_save(provider);
 
@@ -2076,12 +2083,12 @@ static void append_connection_structs(DBusMessageIter *iter, void *user_data)
 
        g_hash_table_iter_init(&hash, provider_hash);
 
-       while (g_hash_table_iter_next(&hash, &key, &value) == TRUE) {
+       while (g_hash_table_iter_next(&hash, &key, &value)) {
                struct vpn_provider *provider = value;
 
                DBG("path %s", provider->path);
 
-               if (provider->identifier == NULL)
+               if (!provider->identifier)
                        continue;
 
                dbus_message_iter_open_container(iter, DBUS_TYPE_STRUCT,
@@ -2100,7 +2107,7 @@ DBusMessage *__vpn_provider_get_connections(DBusMessage *msg)
        DBG("");
 
        reply = dbus_message_new_method_return(msg);
-       if (reply == NULL)
+       if (!reply)
                return NULL;
 
        __connman_dbus_append_objpath_dict_array(reply,
@@ -2109,9 +2116,9 @@ DBusMessage *__vpn_provider_get_connections(DBusMessage *msg)
        return reply;
 }
 
-const char * __vpn_provider_get_ident(struct vpn_provider *provider)
+const char *__vpn_provider_get_ident(struct vpn_provider *provider)
 {
-       if (provider == NULL)
+       if (!provider)
                return NULL;
 
        return provider->identifier;
@@ -2119,26 +2126,26 @@ const char * __vpn_provider_get_ident(struct vpn_provider *provider)
 
 static int set_string(struct vpn_provider *provider,
                        const char *key, const char *value,
-                       gboolean hide_value, gboolean immutable)
+                       bool hide_value, bool immutable)
 {
        DBG("provider %p key %s immutable %s value %s", provider, key,
                immutable ? "yes" : "no",
                hide_value ? "<not printed>" : value);
 
-       if (g_str_equal(key, "Type") == TRUE) {
+       if (g_str_equal(key, "Type")) {
                g_free(provider->type);
                provider->type = g_ascii_strdown(value, -1);
                send_value(provider->path, "Type", provider->type);
-       } else if (g_str_equal(key, "Name") == TRUE) {
+       } else if (g_str_equal(key, "Name")) {
                g_free(provider->name);
                provider->name = g_strdup(value);
                send_value(provider->path, "Name", provider->name);
-       } else if (g_str_equal(key, "Host") == TRUE) {
+       } else if (g_str_equal(key, "Host")) {
                g_free(provider->host);
                provider->host = g_strdup(value);
                send_value(provider->path, "Host", provider->host);
-       } else if (g_str_equal(key, "VPN.Domain") == TRUE ||
-                       g_str_equal(key, "Domain") == TRUE) {
+       } else if (g_str_equal(key, "VPN.Domain") ||
+                       g_str_equal(key, "Domain")) {
                g_free(provider->domain);
                provider->domain = g_strdup(value);
                send_value(provider->path, "Domain", provider->domain);
@@ -2146,23 +2153,23 @@ static int set_string(struct vpn_provider *provider,
                struct vpn_setting *setting;
 
                setting = g_hash_table_lookup(provider->setting_strings, key);
-               if (setting != NULL && immutable == FALSE &&
-                                               setting->immutable == TRUE) {
+               if (setting && !immutable &&
+                                               setting->immutable) {
                        DBG("Trying to set immutable variable %s", key);
                        return -EPERM;
                }
 
                setting = g_try_new0(struct vpn_setting, 1);
-               if (setting == NULL)
+               if (!setting)
                        return -ENOMEM;
 
                setting->value = g_strdup(value);
                setting->hide_value = hide_value;
 
-               if (immutable == TRUE)
-                       setting->immutable = TRUE;
+               if (immutable)
+                       setting->immutable = true;
 
-               if (hide_value == FALSE)
+               if (!hide_value)
                        send_value(provider->path, key, setting->value);
 
                g_hash_table_replace(provider->setting_strings,
@@ -2175,19 +2182,19 @@ static int set_string(struct vpn_provider *provider,
 int vpn_provider_set_string(struct vpn_provider *provider,
                                        const char *key, const char *value)
 {
-       return set_string(provider, key, value, FALSE, FALSE);
+       return set_string(provider, key, value, false, false);
 }
 
 int vpn_provider_set_string_hide_value(struct vpn_provider *provider,
                                        const char *key, const char *value)
 {
-       return set_string(provider, key, value, TRUE, FALSE);
+       return set_string(provider, key, value, true, false);
 }
 
 int __vpn_provider_set_string_immutable(struct vpn_provider *provider,
                                        const char *key, const char *value)
 {
-       return set_string(provider, key, value, FALSE, TRUE);
+       return set_string(provider, key, value, false, true);
 }
 
 const char *vpn_provider_get_string(struct vpn_provider *provider,
@@ -2197,43 +2204,43 @@ const char *vpn_provider_get_string(struct vpn_provider *provider,
 
        DBG("provider %p key %s", provider, key);
 
-       if (g_str_equal(key, "Type") == TRUE)
+       if (g_str_equal(key, "Type"))
                return provider->type;
-       else if (g_str_equal(key, "Name") == TRUE)
+       else if (g_str_equal(key, "Name"))
                return provider->name;
-       else if (g_str_equal(key, "Host") == TRUE)
+       else if (g_str_equal(key, "Host"))
                return provider->host;
-       else if (g_str_equal(key, "HostIP") == TRUE) {
-               if (provider->host_ip == NULL ||
-                               provider->host_ip[0] == NULL)
+       else if (g_str_equal(key, "HostIP")) {
+               if (!provider->host_ip ||
+                               !provider->host_ip[0])
                        return provider->host;
                else
                        return provider->host_ip[0];
-       } else if (g_str_equal(key, "VPN.Domain") == TRUE ||
-                       g_str_equal(key, "Domain") == TRUE)
+       } else if (g_str_equal(key, "VPN.Domain") ||
+                       g_str_equal(key, "Domain"))
                return provider->domain;
 
        setting = g_hash_table_lookup(provider->setting_strings, key);
-       if (setting == NULL)
+       if (!setting)
                return NULL;
 
        return setting->value;
 }
 
-connman_bool_t __vpn_provider_check_routes(struct vpn_provider *provider)
+bool __vpn_provider_check_routes(struct vpn_provider *provider)
 {
-       if (provider == NULL)
-               return FALSE;
+       if (!provider)
+               return false;
 
-       if (provider->user_routes != NULL &&
+       if (provider->user_routes &&
                        g_hash_table_size(provider->user_routes) > 0)
-               return TRUE;
+               return true;
 
-       if (provider->routes != NULL &&
+       if (provider->routes &&
                        g_hash_table_size(provider->routes) > 0)
-               return TRUE;
+               return true;
 
-       return FALSE;
+       return false;
 }
 
 void *vpn_provider_get_data(struct vpn_provider *provider)
@@ -2250,10 +2257,10 @@ void vpn_provider_set_index(struct vpn_provider *provider, int index)
 {
        DBG("index %d provider %p", index, provider);
 
-       if (provider->ipconfig_ipv4 == NULL) {
+       if (!provider->ipconfig_ipv4) {
                provider->ipconfig_ipv4 = __vpn_ipconfig_create(index,
                                                                AF_INET);
-               if (provider->ipconfig_ipv4 == NULL) {
+               if (!provider->ipconfig_ipv4) {
                        DBG("Couldnt create ipconfig for IPv4");
                        goto done;
                }
@@ -2261,10 +2268,10 @@ void vpn_provider_set_index(struct vpn_provider *provider, int index)
 
        __vpn_ipconfig_set_index(provider->ipconfig_ipv4, index);
 
-       if (provider->ipconfig_ipv6 == NULL) {
+       if (!provider->ipconfig_ipv6) {
                provider->ipconfig_ipv6 = __vpn_ipconfig_create(index,
                                                                AF_INET6);
-               if (provider->ipconfig_ipv6 == NULL) {
+               if (!provider->ipconfig_ipv6) {
                        DBG("Couldnt create ipconfig for IPv6");
                        goto done;
                }
@@ -2300,7 +2307,7 @@ int vpn_provider_set_ipaddress(struct vpn_provider *provider,
        DBG("provider %p ipconfig %p family %d", provider, ipconfig,
                                                        ipaddress->family);
 
-       if (ipconfig == NULL)
+       if (!ipconfig)
                return -EINVAL;
 
        provider->family = ipaddress->family;
@@ -2342,7 +2349,7 @@ int vpn_provider_set_nameservers(struct vpn_provider *provider,
        g_strfreev(provider->nameservers);
        provider->nameservers = NULL;
 
-       if (nameservers == NULL)
+       if (!nameservers)
                return 0;
 
        provider->nameservers = g_strsplit(nameservers, " ", 0);
@@ -2367,13 +2374,13 @@ static int route_env_parse(struct vpn_provider *provider, const char *key,
        DBG("name %s", provider->name);
 
        if (!strcmp(provider->type, "openvpn")) {
-               if (g_str_has_prefix(key, "route_network_") == TRUE) {
+               if (g_str_has_prefix(key, "route_network_")) {
                        start = key + strlen("route_network_");
                        *type = PROVIDER_ROUTE_TYPE_ADDR;
-               } else if (g_str_has_prefix(key, "route_netmask_") == TRUE) {
+               } else if (g_str_has_prefix(key, "route_netmask_")) {
                        start = key + strlen("route_netmask_");
                        *type = PROVIDER_ROUTE_TYPE_MASK;
-               } else if (g_str_has_prefix(key, "route_gateway_") == TRUE) {
+               } else if (g_str_has_prefix(key, "route_gateway_")) {
                        start = key + strlen("route_gateway_");
                        *type = PROVIDER_ROUTE_TYPE_GW;
                } else
@@ -2383,11 +2390,11 @@ static int route_env_parse(struct vpn_provider *provider, const char *key,
                *idx = g_ascii_strtoull(start, &end, 10);
 
        } else if (!strcmp(provider->type, "openconnect")) {
-               if (g_str_has_prefix(key, "CISCO_SPLIT_INC_") == TRUE) {
+               if (g_str_has_prefix(key, "CISCO_SPLIT_INC_")) {
                        *family = AF_INET;
                        start = key + strlen("CISCO_SPLIT_INC_");
                } else if (g_str_has_prefix(key,
-                                       "CISCO_IPV6_SPLIT_INC_") == TRUE) {
+                                       "CISCO_IPV6_SPLIT_INC_")) {
                        *family = AF_INET6;
                        start = key + strlen("CISCO_IPV6_SPLIT_INC_");
                } else
@@ -2426,9 +2433,9 @@ int vpn_provider_append_route(struct vpn_provider *provider,
        DBG("idx %lu family %d type %d", idx, family, type);
 
        route = g_hash_table_lookup(provider->routes, GINT_TO_POINTER(idx));
-       if (route == NULL) {
+       if (!route) {
                route = g_try_new0(struct vpn_route, 1);
-               if (route == NULL) {
+               if (!route) {
                        connman_error("out of memory");
                        return -ENOMEM;
                }
@@ -2453,9 +2460,9 @@ int vpn_provider_append_route(struct vpn_provider *provider,
                break;
        }
 
-       if (handle_routes == FALSE) {
-               if (route->netmask != NULL && route->gateway != NULL &&
-                                                       route->network != NULL)
+       if (!handle_routes) {
+               if (route->netmask && route->gateway &&
+                                                       route->network)
                        provider_schedule_changed(provider);
        }
 
@@ -2464,7 +2471,7 @@ int vpn_provider_append_route(struct vpn_provider *provider,
 
 const char *vpn_provider_get_driver_name(struct vpn_provider *provider)
 {
-       if (provider->driver == NULL)
+       if (!provider->driver)
                return NULL;
 
        return provider->driver->name;
@@ -2484,7 +2491,7 @@ static void clean_provider(gpointer key, gpointer value, gpointer user_data)
 {
        struct vpn_provider *provider = value;
 
-       if (provider->driver != NULL && provider->driver->remove)
+       if (provider->driver && provider->driver->remove)
                provider->driver->remove(provider);
 
        connection_unregister(provider);
@@ -2510,10 +2517,10 @@ void vpn_provider_driver_unregister(struct vpn_provider_driver *driver)
        driver_list = g_slist_remove(driver_list, driver);
 
        g_hash_table_iter_init(&iter, provider_hash);
-       while (g_hash_table_iter_next(&iter, &key, &value) == TRUE) {
+       while (g_hash_table_iter_next(&iter, &key, &value)) {
                struct vpn_provider *provider = value;
 
-               if (provider != NULL && provider->driver != NULL &&
+               if (provider && provider->driver &&
                                provider->driver->type == driver->type &&
                                g_strcmp0(provider->driver->name,
                                                        driver->name) == 0) {
@@ -2555,7 +2562,7 @@ static struct connman_agent_driver agent_driver = {
        .remove         = agent_remove,
 };
 
-static void remove_unprovisioned_providers()
+static void remove_unprovisioned_providers(void)
 {
        gchar **providers;
        GKeyFile *keyfile, *configkeyfile;
@@ -2563,30 +2570,30 @@ static void remove_unprovisioned_providers()
        int i = 0;
 
        providers = __connman_storage_get_providers();
-       if (providers == NULL)
+       if (!providers)
                return;
 
-       for (; providers[i] != NULL; i++) {
+       for (; providers[i]; i++) {
                char *group = providers[i] + sizeof("provider_") - 1;
                file = section = NULL;
                keyfile = configkeyfile = NULL;
 
                keyfile = __connman_storage_load_provider(group);
-               if (keyfile == NULL)
+               if (!keyfile)
                        continue;
 
-               file = g_key_file_get_string(keyfile, group,
+               file = __vpn_config_get_string(keyfile, group,
                                        "Config.file", NULL);
-               if (file == NULL)
+               if (!file)
                        goto next;
 
-               section = g_key_file_get_string(keyfile, group,
+               section = __vpn_config_get_string(keyfile, group,
                                        "Config.ident", NULL);
-               if (section == NULL)
+               if (!section)
                        goto next;
 
                configkeyfile = __connman_storage_load_provider_config(file);
-               if (configkeyfile == NULL) {
+               if (!configkeyfile) {
                        /*
                         * Config file is missing, remove the provisioned
                         * service.
@@ -2595,7 +2602,7 @@ static void remove_unprovisioned_providers()
                        goto next;
                }
 
-               if (g_key_file_has_group(configkeyfile, section) == FALSE)
+               if (!g_key_file_has_group(configkeyfile, section))
                        /*
                         * Config section is missing, remove the provisioned
                         * service.
@@ -2603,10 +2610,10 @@ static void remove_unprovisioned_providers()
                        __connman_storage_remove_provider(group);
 
        next:
-               if (keyfile != NULL)
+               if (keyfile)
                        g_key_file_free(keyfile);
 
-               if (configkeyfile != NULL)
+               if (configkeyfile)
                        g_key_file_free(configkeyfile);
 
                g_free(section);
@@ -2616,7 +2623,7 @@ static void remove_unprovisioned_providers()
        g_strfreev(providers);
 }
 
-int __vpn_provider_init(gboolean do_routes)
+int __vpn_provider_init(bool do_routes)
 {
        int err;
 
@@ -2644,12 +2651,12 @@ void __vpn_provider_cleanup(void)
 {
        DBG("");
 
+       connman_agent_driver_unregister(&agent_driver);
+
        g_hash_table_foreach(provider_hash, clean_provider, NULL);
 
        g_hash_table_destroy(provider_hash);
        provider_hash = NULL;
 
-       connman_agent_driver_unregister(&agent_driver);
-
        dbus_connection_unref(connection);
 }