openvpn: Add OpenVPN support

1 files changed, 239 insertions, 0 deletions

diff --git a/plugins/openvpn.c b/plugins/openvpn.c
new file mode 100644
index 00000000..0da6c740
--- /dev/null
+++ b/plugins/openvpn.c
@@ -0,0 +1,239 @@
+/*
+ *
+ *  Connection Manager
+ *
+ *  Copyright (C) 2010  BMW Car IT GmbH. 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
+ *  published by the Free Software Foundation.
+ *
+ *  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <net/if.h>
+
+#include <glib.h>
+
+#define CONNMAN_API_SUBJECT_TO_CHANGE
+#include <connman/plugin.h>
+#include <connman/provider.h>
+#include <connman/log.h>
+#include <connman/task.h>
+#include <connman/dbus.h>
+
+#include "vpn.h"
+
+static DBusConnection *connection;
+
+static int ov_notify(DBusMessage *msg, struct connman_provider *provider)
+{
+	DBusMessageIter iter, dict;
+	const char *reason, *key, *value;
+	const char *domain = NULL;
+	char *dns_entries = NULL;
+
+	dbus_message_iter_init(msg, &iter);
+
+	dbus_message_iter_get_basic(&iter, &reason);
+	dbus_message_iter_next(&iter);
+
+	dbus_message_iter_init(msg, &iter);
+
+	dbus_message_iter_get_basic(&iter, &reason);
+	dbus_message_iter_next(&iter);
+
+	if (!provider) {
+		connman_error("No provider found");
+		return VPN_STATE_FAILURE;
+	}
+
+	if (strcmp(reason, "up"))
+		return VPN_STATE_DISCONNECT;
+
+	domain = connman_provider_get_string(provider, "VPN.Domain");
+
+	dbus_message_iter_recurse(&iter, &dict);
+
+	while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
+		DBusMessageIter entry;
+
+		dbus_message_iter_recurse(&dict, &entry);
+		dbus_message_iter_get_basic(&entry, &key);
+		dbus_message_iter_next(&entry);
+		dbus_message_iter_get_basic(&entry, &value);
+
+		DBG("%s = %s", key, value);
+
+		if (!strcmp(key, "trusted_ip"))
+			connman_provider_set_string(provider, "Gateway", value);
+
+		if (!strcmp(key, "ifconfig_local"))
+			connman_provider_set_string(provider, "Address", value);
+
+		if (!strcmp(key, "route_vpn_gateway"))
+			connman_provider_set_string(provider, "Peer", value);
+
+		if (g_str_has_prefix(key, "foreign_option_")) {
+			gchar **options;
+
+			options = g_strsplit(value, " ", 3);
+			if (options[0] != NULL &&
+					!strcmp(options[0], "dhcp-option") &&
+					options[1] != NULL &&
+					!strcmp(options[1], "DNS") &&
+					options[2] != NULL) {
+
+				if (dns_entries != NULL) {
+					char *tmp;
+
+					tmp = g_strjoin(" ", dns_entries,
+							options[2], NULL);
+					g_free(dns_entries);
+					dns_entries = tmp;
+				} else {
+					dns_entries = g_strdup(options[2]);
+				}
+			}
+
+			g_strfreev(options);
+		}
+
+		dbus_message_iter_next(&dict);
+	}
+
+	if (dns_entries != NULL) {
+		connman_provider_set_string(provider, "DNS", dns_entries);
+		g_free(dns_entries);
+	}
+
+	return VPN_STATE_CONNECT;
+}
+
+static int ov_connect(struct connman_provider *provider,
+		struct connman_task *task, const char *if_name)
+{
+	const char *vpnhost, *cafile, *mtu, *certfile, *keyfile;
+	int err, fd;
+
+	vpnhost = connman_provider_get_string(provider, "Host");
+	if (!vpnhost) {
+		connman_error("Host not set; cannot enable VPN");
+		return -EINVAL;
+	}
+
+	cafile = connman_provider_get_string(provider, "OpenVPN.CACert");
+	certfile = connman_provider_get_string(provider, "OpenVPN.Cert");
+	keyfile = connman_provider_get_string(provider, "OpenVPN.Key");
+	mtu = connman_provider_get_string(provider, "VPN.MTU");
+
+	if (mtu)
+		connman_task_add_argument(task, "--mtu", (char *)mtu);
+
+	connman_task_add_argument(task, "--syslog", NULL);
+
+	connman_task_add_argument(task, "--script-security", "2");
+
+	connman_task_add_argument(task, "--up",
+					SCRIPTDIR "/openvpn-script");
+	connman_task_add_argument(task, "--up-restart", NULL);
+
+	connman_task_add_argument(task, "--setenv", NULL);
+	connman_task_add_argument(task, "CONNMAN_BUSNAME",
+					dbus_bus_get_unique_name(connection));
+
+	connman_task_add_argument(task, "--setenv", NULL);
+	connman_task_add_argument(task, "CONNMAN_INTERFACE",
+					CONNMAN_TASK_INTERFACE);
+
+	connman_task_add_argument(task, "--setenv", NULL);
+	connman_task_add_argument(task, "CONNMAN_PATH",
+					connman_task_get_path(task));
+
+	connman_task_add_argument(task, "--dev", if_name);
+	connman_task_add_argument(task, "--dev-type", "tun");
+
+	connman_task_add_argument(task, "--tls-client", NULL);
+	connman_task_add_argument(task, "--remote", (char *)vpnhost);
+	connman_task_add_argument(task, "--nobind", NULL);
+	connman_task_add_argument(task, "--persist-key", NULL);
+	connman_task_add_argument(task, "--persist-tun", NULL);
+
+	connman_task_add_argument(task, "--route-noexec", NULL);
+	connman_task_add_argument(task, "--ifconfig-noexec", NULL);
+
+	/*
+	 * Disable client restarts because we can't handle this at the
+	 * moment. The problem is that when OpenVPN decides to switch
+	 * from CONNECTED state to RECONNECTING and then to RESOLVE,
+	 * it is not possible to do a DNS lookup. The DNS server is
+	 * not accessable through the tunnel anymore and so we end up
+	 * trying to resolve the OpenVPN servers address.
+	 */
+	connman_task_add_argument(task, "--ping-restart", "0");
+
+	connman_task_add_argument(task, "--client", NULL);
+
+	if (cafile) {
+		connman_task_add_argument(task, "--ca",
+						(char *)cafile);
+	}
+
+	if (certfile) {
+		connman_task_add_argument(task, "--cert",
+						(char *)certfile);
+	}
+
+	if (keyfile) {
+		connman_task_add_argument(task, "--key",
+						(char *)keyfile);
+	}
+
+	fd = fileno(stderr);
+	err = connman_task_run(task, vpn_died, provider,
+			NULL, &fd, &fd);
+	if (err < 0) {
+		connman_error("openvpn failed to start");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static struct vpn_driver vpn_driver = {
+	.notify	= ov_notify,
+	.connect	= ov_connect,
+};
+
+static int openvpn_init(void)
+{
+	connection = connman_dbus_get_connection();
+
+	return vpn_register("openvpn", &vpn_driver, OPENVPN);
+}
+
+static void openvpn_exit(void)
+{
+	vpn_unregister("openvpn");
+
+	dbus_connection_unref(connection);
+}
+
+CONNMAN_PLUGIN_DEFINE(openvpn, "OpenVPN plugin", VERSION,
+	CONNMAN_PLUGIN_PRIORITY_DEFAULT, openvpn_init, openvpn_exit)