dhcp: add support for dhcpcanon client

https://github.com/NetworkManager/NetworkManager/pull/31

8 files changed, 304 insertions, 5 deletions

diff --git a/Makefile.am b/Makefile.am
index ed455746f5..83fe9de83d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1092,6 +1092,7 @@ src_cppflags = \
 	-DNMSTATEDIR=\"$(nmstatedir)\" \
 	-DNMLIBDIR=\"$(nmlibdir)\" \
 	\
+	-DDHCPCANON_PATH=\"$(DHCPCANON_PATH)\" \
 	-DDHCLIENT_PATH=\"$(DHCLIENT_PATH)\" \
 	-DDHCPCD_PATH=\"$(DHCPCD_PATH)\" \
 	\
@@ -1411,6 +1412,7 @@ src_libNetworkManager_la_SOURCES = \
 	src/devices/nm-device-vxlan.c \
 	src/devices/nm-device-vxlan.h \
 	\
+	src/dhcp/nm-dhcp-dhcpcanon.c \
 	src/dhcp/nm-dhcp-dhclient.c \
 	src/dhcp/nm-dhcp-dhcpcd.c \
 	src/dhcp/nm-dhcp-helper-api.h \
diff --git a/configure.ac b/configure.ac
index 314890a26a..a4353760a4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -852,6 +852,25 @@ else
 fi
 AM_CONDITIONAL(WITH_OFONO, test "${with_ofono}" = "yes")
 
+# DHCP client support with dhcpcanon
+AC_ARG_WITH([dhcpcanon],
+            AS_HELP_STRING([--with-dhcpcanon=yes|no|path], [Enable dhcpcanon support (experimental)]))
+if test "$with_dhcpcanon" != "no"; then
+    with_dhcpcanon_="$with_dhcpcanon"
+    AC_PATH_PROGS(with_dhcpcanon, dhcpcanon, no, /sbin:/usr/sbin:/usr/local/sbin:/usr/bin:/usr/local/bin)
+    if test "$with_dhcpcanon" == "no"; then
+        if test "$with_dhcpcanon_" == yes; then
+            AC_MSG_WARN([dhcpcanon not found, assume path /sbin/dhcpcanon])
+            with_dhcpcanon=/sbin/dhcpcanon
+        fi
+    fi
+fi
+if test "$with_dhcpcanon" != "no"; then
+    AC_DEFINE(WITH_DHCPCANON, 1, [Define if you have dhcpcanon])
+    AC_SUBST(DHCPCANON_PATH, $with_dhcpcanon)
+else
+    AC_DEFINE(WITH_DHCPCANON, 0, [Define if you have dhcpcanon])
+fi
 # DHCP client support
 AC_ARG_WITH([dhclient],
             AS_HELP_STRING([--with-dhclient=yes|no|path], [Enable dhclient 4.x support]))
@@ -933,6 +952,7 @@ AC_ARG_WITH(config-dhcp-default,
 if test "$config_dhcp_default" = yes -o "$config_dhcp_default" = no; then
 	config_dhcp_default=''
 fi
+test -z "$config_dhcp_default" -a "$with_dhcpcanon" != "no" && config_dhcp_default='dhcpcanon'
 test -z "$config_dhcp_default" -a "$with_dhclient" != "no" && config_dhcp_default='dhclient'
 test -z "$config_dhcp_default" -a "$with_dhcpcd"   != "no" && config_dhcp_default='dhcpcd'
 test -z "$config_dhcp_default"                             && config_dhcp_default='internal'
@@ -1019,7 +1039,7 @@ AC_SUBST(DNSSEC_TRIGGER_SCRIPT)
 
 # system CA certificates path
 AC_ARG_WITH(system-ca-path,
-            AS_HELP_STRING([--with-system-ca-path=/path/to/ssl/certs], [path to system CA certificates])) 
+            AS_HELP_STRING([--with-system-ca-path=/path/to/ssl/certs], [path to system CA certificates]))
 if test "x${with_system_ca_path}" = x; then
 	SYSTEM_CA_PATH=/etc/ssl/certs
 else
@@ -1358,6 +1378,7 @@ echo "  config-dns-rc-manager-default: ${config_dns_rc_manager_default}"
 echo
 
 echo "DHCP clients (default $config_dhcp_default):"
+echo "  dhcpcanon: $with_dhcpcanon"
 echo "  dhclient: $with_dhclient"
 echo "  dhcpcd: $with_dhcpcd"
 echo "  dhcpcd-supports-ipv6: $with_dhcpcd_supports_ipv6"
diff --git a/contrib/fedora/rpm/NetworkManager.spec b/contrib/fedora/rpm/NetworkManager.spec
index 3ee068d350..64393526c4 100644
--- a/contrib/fedora/rpm/NetworkManager.spec
+++ b/contrib/fedora/rpm/NetworkManager.spec
@@ -373,6 +373,7 @@ intltoolize --automake --copy --force
 	--disable-static \
 	--with-dhclient=yes \
 	--with-dhcpcd=no \
+	--with-dhcpcanon=no \
 	--with-config-dhcp-default=dhclient \
 	--with-crypto=nss \
 %if %{with test}
@@ -694,4 +695,3 @@ fi
 
 %changelog
 __CHANGELOG__
-
diff --git a/src/dhcp/nm-dhcp-client.h b/src/dhcp/nm-dhcp-client.h
index 9c9be1605c..02804002f3 100644
--- a/src/dhcp/nm-dhcp-client.h
+++ b/src/dhcp/nm-dhcp-client.h
@@ -192,6 +192,7 @@ typedef struct {
 	                                 guint32 route_metric);
 } NMDhcpClientFactory;
 
+extern const NMDhcpClientFactory _nm_dhcp_client_factory_dhcpcanon;
 extern const NMDhcpClientFactory _nm_dhcp_client_factory_dhclient;
 extern const NMDhcpClientFactory _nm_dhcp_client_factory_dhcpcd;
 extern const NMDhcpClientFactory _nm_dhcp_client_factory_internal;
diff --git a/src/dhcp/nm-dhcp-dhcpcanon.c b/src/dhcp/nm-dhcp-dhcpcanon.c
new file mode 100644
index 0000000000..d7ddd1943a
--- /dev/null
+++ b/src/dhcp/nm-dhcp-dhcpcanon.c
@@ -0,0 +1,272 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
+/* nm-dhcp-dhcpcanon.c - dhcpcanon specific hooks for NetworkManager
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Copyright (C) 2017 juga <juga at riseup dot net>
+ */
+
+#include "nm-default.h"
+
+#if WITH_DHCPCANON
+
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include "nm-utils.h"
+#include "nm-dhcp-manager.h"
+#include "NetworkManagerUtils.h"
+#include "nm-dhcp-listener.h"
+#include "nm-dhcp-client-logging.h"
+
+#define NM_TYPE_DHCP_DHCPCANON            (nm_dhcp_dhcpcanon_get_type ())
+#define NM_DHCP_DHCPCANON(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), NM_TYPE_DHCP_DHCPCANON, NMDhcpDhcpcanon))
+#define NM_DHCP_DHCPCANON_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), NM_TYPE_DHCP_DHCPCANON, NMDhcpDhcpcanonClass))
+#define NM_IS_DHCP_DHCPCANON(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), NM_TYPE_DHCP_DHCPCANON))
+#define NM_IS_DHCP_DHCPCANON_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), NM_TYPE_DHCP_DHCPCANON))
+#define NM_DHCP_DHCPCANON_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), NM_TYPE_DHCP_DHCPCANON, NMDhcpDhcpcanonClass))
+
+typedef struct _NMDhcpDhcpcanon NMDhcpDhcpcanon;
+typedef struct _NMDhcpDhcpcanonClass NMDhcpDhcpcanonClass;
+
+static GType nm_dhcp_dhcpcanon_get_type (void);
+
+/*****************************************************************************/
+
+typedef struct {
+	char *conf_file;
+	const char *def_leasefile;
+	char *lease_file;
+	char *pid_file;
+	NMDhcpListener *dhcp_listener;
+} NMDhcpDhcpcanonPrivate;
+
+struct _NMDhcpDhcpcanon {
+	NMDhcpClient parent;
+	NMDhcpDhcpcanonPrivate _priv;
+};
+
+struct _NMDhcpDhcpcanonClass {
+	NMDhcpClientClass parent;
+};
+
+G_DEFINE_TYPE (NMDhcpDhcpcanon, nm_dhcp_dhcpcanon, NM_TYPE_DHCP_CLIENT)
+
+#define NM_DHCP_DHCPCANON_GET_PRIVATE(self) _NM_GET_PRIVATE (self, NMDhcpDhcpcanon, NM_IS_DHCP_DHCPCANON)
+
+/*****************************************************************************/
+
+static const char *
+nm_dhcp_dhcpcanon_get_path (void)
+{
+	return nm_utils_find_helper ("dhcpcanon", DHCPCANON_PATH, NULL);
+}
+
+
+static gboolean
+dhcpcanon_start (NMDhcpClient *client,
+                const char *mode_opt,
+                const GByteArray *duid,
+                gboolean release,
+                pid_t *out_pid,
+                int prefixes)
+{
+	NMDhcpDhcpcanon *self = NM_DHCP_DHCPCANON (client);
+	NMDhcpDhcpcanonPrivate *priv = NM_DHCP_DHCPCANON_GET_PRIVATE (self);
+	GPtrArray *argv = NULL;
+	pid_t pid;
+	GError *error = NULL;
+	const char *iface, *system_bus_address, *dhcpcanon_path = NULL;
+	char *binary_name, *cmd_str, *pid_file = NULL, *system_bus_address_env = NULL;
+	int addr_family;
+
+	g_return_val_if_fail (priv->pid_file == NULL, FALSE);
+
+	iface = nm_dhcp_client_get_iface (client);
+	addr_family = nm_dhcp_client_get_addr_family (client);
+	dhcpcanon_path = nm_dhcp_dhcpcanon_get_path ();
+	_LOGD ("dhcpcanon_path: %s", dhcpcanon_path);
+	if (!dhcpcanon_path) {
+		_LOGW ("dhcpcanon could not be found");
+		return FALSE;
+	}
+
+	pid_file = g_strdup_printf (RUNSTATEDIR "/dhcpcanon%c-%s.pid",
+	                            nm_utils_addr_family_to_char (addr_family),
+	                            iface);
+	_LOGD ("pid_file: %s", pid_file);
+
+	/* Kill any existing dhcpcanon from the pidfile */
+	binary_name = g_path_get_basename (dhcpcanon_path);
+	nm_dhcp_client_stop_existing (pid_file, binary_name);
+	g_free (binary_name);
+
+	argv = g_ptr_array_new ();
+	g_ptr_array_add (argv, (gpointer) dhcpcanon_path);
+
+	g_ptr_array_add (argv, (gpointer) "-sf");	/* Set script file */
+	g_ptr_array_add (argv, (gpointer) nm_dhcp_helper_path);
+
+	if (pid_file) {
+		g_ptr_array_add (argv, (gpointer) "-pf");	/* Set pid file */
+		g_ptr_array_add (argv, (gpointer) pid_file);
+	}
+
+	if (priv->conf_file) {
+		g_ptr_array_add (argv, (gpointer) "-cf");	/* Set interface config file */
+		g_ptr_array_add (argv, (gpointer) priv->conf_file);
+	}
+
+	/* Usually the system bus address is well-known; but if it's supposed
+	 * to be something else, we need to push it to dhcpcanon, since dhcpcanon
+	 * sanitizes the environment it gives the action scripts.
+	 */
+	system_bus_address = getenv ("DBUS_SYSTEM_BUS_ADDRESS");
+	if (system_bus_address) {
+		system_bus_address_env = g_strdup_printf ("DBUS_SYSTEM_BUS_ADDRESS=%s", system_bus_address);
+		g_ptr_array_add (argv, (gpointer) "-e");
+		g_ptr_array_add (argv, (gpointer) system_bus_address_env);
+	}
+
+
+	g_ptr_array_add (argv, (gpointer) iface);
+	g_ptr_array_add (argv, NULL);
+
+	cmd_str = g_strjoinv (" ", (gchar **) argv->pdata);
+	g_free (cmd_str);
+
+	if (g_spawn_async (NULL, (char **) argv->pdata, NULL,
+	                   G_SPAWN_DO_NOT_REAP_CHILD | G_SPAWN_STDOUT_TO_DEV_NULL | G_SPAWN_STDERR_TO_DEV_NULL,
+	                   nm_utils_setpgid, NULL, &pid, &error)) {
+		 g_assert (pid > 0);
+		_LOGI ("dhcpcanon started with pid %d", pid);
+		nm_dhcp_client_watch_child (client, pid);
+		priv->pid_file = pid_file;
+	} else {
+		_LOGW ("dhcpcanon failed to start: '%s'", error->message);
+		g_error_free (error);
+		g_free (pid_file);
+	}
+
+	g_ptr_array_free (argv, TRUE);
+	g_free (system_bus_address_env);
+	return pid > 0 ? TRUE : FALSE;
+}
+
+static gboolean
+ip4_start (NMDhcpClient *client, const char *dhcp_anycast_addr, const char *last_ip4_address)
+{
+	gboolean success = FALSE;
+	success = dhcpcanon_start (client, NULL, NULL, FALSE, NULL, 0);
+	return success;
+}
+
+static gboolean
+ip6_start (NMDhcpClient *client,
+           const char *dhcp_anycast_addr,
+           const struct in6_addr *ll_addr,
+           gboolean info_only,
+           NMSettingIP6ConfigPrivacy privacy,
+           const GByteArray *duid,
+           guint needed_prefixes)
+{
+	NMDhcpDhcpcanon *self = NM_DHCP_DHCPCANON (client);
+
+	_LOGW ("the dhcpcd backend does not support IPv6");
+	return FALSE;
+}
+static void
+stop (NMDhcpClient *client, gboolean release, const GByteArray *duid)
+{
+	NMDhcpDhcpcanon *self = NM_DHCP_DHCPCANON (client);
+	NMDhcpDhcpcanonPrivate *priv = NM_DHCP_DHCPCANON_GET_PRIVATE (self);
+
+	NM_DHCP_CLIENT_CLASS (nm_dhcp_dhcpcanon_parent_class)->stop (client, release, duid);
+
+	if (priv->pid_file) {
+		if (remove (priv->pid_file) == -1)
+			_LOGD ("could not remove dhcp pid file \"%s\": %d (%s)", priv->pid_file, errno, g_strerror (errno));
+		g_free (priv->pid_file);
+		priv->pid_file = NULL;
+	}
+}
+
+static void
+state_changed (NMDhcpClient *client,
+               NMDhcpState state,
+               GObject *ip_config,
+               GHashTable *options)
+{
+	if (nm_dhcp_client_get_client_id (client))
+		return;
+	if (state != NM_DHCP_STATE_BOUND)
+		return;
+}
+
+/*****************************************************************************/
+
+static void
+nm_dhcp_dhcpcanon_init (NMDhcpDhcpcanon *self)
+{
+	NMDhcpDhcpcanonPrivate *priv = NM_DHCP_DHCPCANON_GET_PRIVATE (self);
+
+	priv->dhcp_listener = g_object_ref (nm_dhcp_listener_get ());
+	g_signal_connect (priv->dhcp_listener,
+	                  NM_DHCP_LISTENER_EVENT,
+	                  G_CALLBACK (nm_dhcp_client_handle_event),
+	                  self);
+}
+
+static void
+dispose (GObject *object)
+{
+	NMDhcpDhcpcanonPrivate *priv = NM_DHCP_DHCPCANON_GET_PRIVATE ((NMDhcpDhcpcanon *) object);
+
+	if (priv->dhcp_listener) {
+		g_signal_handlers_disconnect_by_func (priv->dhcp_listener,
+		                                      G_CALLBACK (nm_dhcp_client_handle_event),
+		                                      NM_DHCP_DHCPCANON (object));
+		g_clear_object (&priv->dhcp_listener);
+	}
+
+	nm_clear_g_free (&priv->pid_file);
+
+	G_OBJECT_CLASS (nm_dhcp_dhcpcanon_parent_class)->dispose (object);
+}
+
+static void
+nm_dhcp_dhcpcanon_class_init (NMDhcpDhcpcanonClass *dhcpcanon_class)
+{
+	NMDhcpClientClass *client_class = NM_DHCP_CLIENT_CLASS (dhcpcanon_class);
+	GObjectClass *object_class = G_OBJECT_CLASS (dhcpcanon_class);
+
+	object_class->dispose = dispose;
+
+	client_class->ip4_start = ip4_start;
+	client_class->ip6_start = ip6_start;
+	client_class->stop = stop;
+	client_class->state_changed = state_changed;
+}
+
+const NMDhcpClientFactory _nm_dhcp_client_factory_dhcpcanon = {
+	.name = "dhcpcanon",
+	.get_type = nm_dhcp_dhcpcanon_get_type,
+	.get_path = nm_dhcp_dhcpcanon_get_path,
+	.get_lease_ip_configs = NULL,
+};
+
+#endif /* WITH_DHCPCANON */
diff --git a/src/dhcp/nm-dhcp-listener.c b/src/dhcp/nm-dhcp-listener.c
index 3385415733..a0449816cd 100644
--- a/src/dhcp/nm-dhcp-listener.c
+++ b/src/dhcp/nm-dhcp-listener.c
@@ -41,10 +41,13 @@
 
 /*****************************************************************************/
 
-const NMDhcpClientFactory *const _nm_dhcp_manager_factories[3] = {
+const NMDhcpClientFactory *const _nm_dhcp_manager_factories[4] = {
 	/* the order here matters, as we will try the plugins in this order to find
 	 * the first available plugin. */
 
+#if WITH_DHCPCANON
+	&_nm_dhcp_client_factory_dhcpcanon,
+#endif
 #if WITH_DHCLIENT
 	&_nm_dhcp_client_factory_dhclient,
 #endif
diff --git a/src/dhcp/nm-dhcp-manager.h b/src/dhcp/nm-dhcp-manager.h
index 6e9bcaf6e8..078117ffab 100644
--- a/src/dhcp/nm-dhcp-manager.h
+++ b/src/dhcp/nm-dhcp-manager.h
@@ -90,6 +90,6 @@ GSList *       nm_dhcp_manager_get_lease_ip_configs (NMDhcpManager *self,
 /* For testing only */
 extern const char* nm_dhcp_helper_path;
 
-extern const NMDhcpClientFactory *const _nm_dhcp_manager_factories[3];
+extern const NMDhcpClientFactory *const _nm_dhcp_manager_factories[4];
 
 #endif /* __NETWORKMANAGER_DHCP_MANAGER_H__ */
diff --git a/src/nm-iface-helper.c b/src/nm-iface-helper.c
index 5a68713a5b..1493ef1974 100644
--- a/src/nm-iface-helper.c
+++ b/src/nm-iface-helper.c
@@ -537,7 +537,7 @@ main (int argc, char *argv[])
 
 /*****************************************************************************/
 
-const NMDhcpClientFactory *const _nm_dhcp_manager_factories[3] = {
+const NMDhcpClientFactory *const _nm_dhcp_manager_factories[4] = {
 	&_nm_dhcp_client_factory_internal,
 };