ifcfg-rh: allow handling complex routing rules via dispatcher (rh #1160013)

If a connection has an associated "rule-NAME" or "rule6-NAME" file,
don't try to read in the routes, since NetworkManager won't be able to
parse them correctly. Instead, log a warning that they will need to be
applied via a dispatcher script, and provide a script that would do
that in examples/dispatcher/.

contrib/fedora/rpm/NetworkManager.spec

@@ -450,6 +450,12 @@ mkdir -p $RPM_BUILD_ROOT%{_sysconfdir}/%{name}/conf.d
 # create a dnsmasq.d directory
 %{__mkdir_p} $RPM_BUILD_ROOT%{_sysconfdir}/NetworkManager/dnsmasq.d
 
+# create dispatcher directories
+mkdir -p $RPM_BUILD_ROOT%{_sysconfdir}/%{name}/dispatcher.d
+mkdir -p $RPM_BUILD_ROOT%{_sysconfdir}/%{name}/dispatcher.d/pre-up.d
+mkdir -p $RPM_BUILD_ROOT%{_sysconfdir}/%{name}/dispatcher.d/pre-down.d
+%{__cp} examples/dispatcher/10-ifcfg-rh-routes.sh $RPM_BUILD_ROOT%{_sysconfdir}/%{name}/dispatcher.d/pre-up.d
+
 %{__mkdir_p} $RPM_BUILD_ROOT%{_datadir}/gnome-vpn-properties
 
 %{__mkdir_p} $RPM_BUILD_ROOT%{_localstatedir}/lib/NetworkManager
@@ -509,6 +515,7 @@ fi
 %dir %{_sysconfdir}/%{name}/dispatcher.d
 %dir %{_sysconfdir}/%{name}/dispatcher.d/pre-down.d
 %dir %{_sysconfdir}/%{name}/dispatcher.d/pre-up.d
+%{_sysconfdir}/%{name}/dispatcher.d/pre-up.d/10-ifcfg-rh-routes.sh
 %dir %{_sysconfdir}/%{name}/dnsmasq.d
 %dir %{_sysconfdir}/%{name}/VPN
 %config(noreplace) %{_sysconfdir}/%{name}/NetworkManager.conf

examples/dispatcher/10-ifcfg-rh-routes.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+# This ifcfg-rh-specific script runs
+# /etc/sysconfig/network-scripts/ifup-routes when bringing up
+# interfaces that have routing rules associated with them that can't
+# be expressed by NMSettingIPConfig. (Eg, policy-based routing.)
+
+# This should be installed in dispatcher.d/pre-up.d/
+
+dir=$(dirname "$CONNECTION_FILENAME")
+if [ "$dir" != "/etc/sysconfig/network-scripts" ]; then
+    exit 0
+fi
+profile=$(basename "$CONNECTION_FILENAME" | sed -ne 's/^ifcfg-//p')
+if [ -z "$profile" ]; then
+    exit 0
+fi
+
+if [ -f "$dir/rule-$profile" -o -f "$dir/rule6-$profile" ]; then
+    /etc/sysconfig/network-scripts/ifup-routes "$DEVICE_IP_IFACE" "$profile"
+fi

examples/dispatcher/Makefile.am

@@ -1,3 +1,4 @@
 EXTRA_DIST = \
+	10-ifcfg-rh-routes.sh \
 	70-wifi-wired-exclusive.sh
 

src/settings/plugins/ifcfg-rh/common.h

@@ -26,7 +26,9 @@
 #define IFCFG_TAG "ifcfg-"
 #define KEYS_TAG "keys-"
 #define ROUTE_TAG "route-"
+#define RULE_TAG "rule-"
 #define ROUTE6_TAG "route6-"
+#define RULE6_TAG "rule6-"
 
 #define BAK_TAG ".bak"
 #define TILDE_TAG "~"

src/settings/plugins/ifcfg-rh/nm-ifcfg-connection.c

@@ -331,6 +331,28 @@ nm_ifcfg_connection_get_unrecognized_spec (NMIfcfgConnection *self)
 	return NM_IFCFG_CONNECTION_GET_PRIVATE (self)->unrecognized_spec;
 }
 
+static void
+replace_and_commit (NMSettingsConnection *connection,
+                    NMConnection *new_connection,
+                    NMSettingsConnectionCommitFunc callback,
+                    gpointer user_data)
+{
+	const char *filename;
+	GError *error = NULL;
+
+	filename = nm_settings_connection_get_filename (connection);
+	if (filename && utils_has_complex_routes (filename)) {
+		if (callback) {
+			error = g_error_new_literal (NM_SETTINGS_ERROR, NM_SETTINGS_ERROR_FAILED,
+			                             "Cannot modify a connection that has an associated 'rule-' or 'rule6-' file");
+			callback (connection, error, user_data);
+			g_clear_error (&error);
+		}
+	}
+
+	NM_SETTINGS_CONNECTION_CLASS (nm_ifcfg_connection_parent_class)->replace_and_commit (connection, new_connection, callback, user_data);
+}
+
 static void
 commit_changes (NMSettingsConnection *connection,
                 NMSettingsConnectionCommitFunc callback,
@@ -493,6 +515,7 @@ nm_ifcfg_connection_class_init (NMIfcfgConnectionClass *ifcfg_connection_class)
 	object_class->get_property = get_property;
 	object_class->dispose      = dispose;
 	settings_class->delete = do_delete;
+	settings_class->replace_and_commit = replace_and_commit;
 	settings_class->commit_changes = commit_changes;
 
 	/* Properties */

src/settings/plugins/ifcfg-rh/reader.c

@@ -1071,14 +1071,10 @@ make_ip4_setting (shvarFile *ifcfg,
 
 	/* Static routes  - route-<name> file */
 	route_path = utils_get_route_path (ifcfg->fileName);
-	if (!route_path) {
-		g_set_error (error, NM_SETTINGS_ERROR, NM_SETTINGS_ERROR_INVALID_CONNECTION,
-		             "Could not get route file path for '%s'", ifcfg->fileName);
-		goto done;
-	}
 
-	/* First test new/legacy syntax */
-	if (utils_has_route_file_new_syntax (route_path)) {
+	if (utils_has_complex_routes (route_path)) {
+		PARSE_WARNING ("'rule-' or 'rule6-' file is present; you will need to use a dispatcher script to apply these routes");
+	} else if (utils_has_route_file_new_syntax (route_path)) {
 		/* Parse route file in new syntax */
 		route_ifcfg = utils_get_route_ifcfg (ifcfg->fileName, FALSE);
 		if (route_ifcfg) {
@@ -1465,18 +1461,15 @@ make_ip6_setting (shvarFile *ifcfg,
 
 	/* DNS searches ('DOMAIN' key) are read by make_ip4_setting() and included in NMSettingIPConfig */
 
-	/* Read static routes from route6-<interface> file */
-	route6_path = utils_get_route6_path (ifcfg->fileName);
-	if (!route6_path) {
-		g_set_error (error, NM_SETTINGS_ERROR, NM_SETTINGS_ERROR_INVALID_CONNECTION,
-		             "Could not get route6 file path for '%s'", ifcfg->fileName);
-		goto error;
+	if (!utils_has_complex_routes (ifcfg->fileName)) {
+		/* Read static routes from route6-<interface> file */
+		route6_path = utils_get_route6_path (ifcfg->fileName);
+		if (!read_route6_file (route6_path, s_ip6, error))
+			goto error;
+
+		g_free (route6_path);
 	}
 
-	if (!read_route6_file (route6_path, s_ip6, error))
-		goto error;
-
-	g_free (route6_path);
 	return NM_SETTING (s_ip6);
 
 error:

src/settings/plugins/ifcfg-rh/utils.c

@@ -360,6 +360,30 @@ gone:
 	return ret;
 }
 
+gboolean
+utils_has_complex_routes (const char *filename)
+{
+	char *rules;
+
+	g_return_val_if_fail (filename != NULL, TRUE);
+
+	rules = utils_get_extra_path (filename, RULE_TAG);
+	if (g_file_test (rules, G_FILE_TEST_EXISTS)) {
+		g_free (rules);
+		return TRUE;
+	}
+	g_free (rules);
+
+	rules = utils_get_extra_path (filename, RULE6_TAG);
+	if (g_file_test (rules, G_FILE_TEST_EXISTS)) {
+		g_free (rules);
+		return TRUE;
+	}
+	g_free (rules);
+
+	return FALSE;
+}
+
 gboolean
 utils_ignore_ip_config (NMConnection *connection)
 {

src/settings/plugins/ifcfg-rh/utils.h

@@ -47,6 +47,7 @@ shvarFile *utils_get_route_ifcfg (const char *parent, gboolean should_create);
 shvarFile *utils_get_route6_ifcfg (const char *parent, gboolean should_create);
 
 gboolean utils_has_route_file_new_syntax (const char *filename);
+gboolean utils_has_complex_routes (const char *filename);
 
 gboolean utils_ignore_ip_config (NMConnection *connection);
 

src/settings/plugins/ifcfg-rh/writer.c

@@ -2638,6 +2638,12 @@ writer_update_connection (NMConnection *connection,
                           const char *keyfile,
                           GError **error)
 {
+	if (utils_has_complex_routes (filename)) {
+		g_set_error (error, NM_SETTINGS_ERROR, NM_SETTINGS_ERROR_FAILED,
+		             "Cannot modify a connection that has an associated 'rule-' or 'rule6-' file");
+		return FALSE;
+	}
+
 	return write_connection (connection, ifcfg_dir, filename, keyfile, NULL, error);
 }