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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* nm-dhcp-dhcpcd.c - dhcpcd specific hooks for NetworkManager
*
* Copyright (C) 2008 Roy Marples
* Copyright (C) 2010 Dan Williams <dcbw@redhat.com>
*
* 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.
*
*/
#include <config.h>
#include <glib.h>
#include <glib/gi18n.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "nm-dhcp-dhcpcd.h"
#include "nm-dhcp-manager.h"
#include "nm-utils.h"
#include "nm-logging.h"
#include "nm-posix-signals.h"
#include "NetworkManagerUtils.h"
#include "nm-dhcp-listener.h"
G_DEFINE_TYPE (NMDhcpDhcpcd, nm_dhcp_dhcpcd, NM_TYPE_DHCP_CLIENT)
#define NM_DHCP_DHCPCD_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), NM_TYPE_DHCP_DHCPCD, NMDhcpDhcpcdPrivate))
typedef struct {
char *pid_file;
} NMDhcpDhcpcdPrivate;
static const char *
nm_dhcp_dhcpcd_get_path (void)
{
const char *path = NULL;
if (WITH_DHCPCD)
path = nm_utils_find_helper ("dhcpcd", DHCPCD_PATH, NULL);
return path;
}
static void
dhcpcd_child_setup (gpointer user_data G_GNUC_UNUSED)
{
/* We are in the child process at this point */
pid_t pid = getpid ();
setpgid (pid, pid);
/*
* We blocked signals in main(). We need to restore original signal
* mask for dhcpcd here so that it can receive signals.
*/
nm_unblock_posix_signals (NULL);
}
static gboolean
ip4_start (NMDhcpClient *client,
const char *dhcp_client_id,
const char *dhcp_anycast_addr,
const char *hostname)
{
NMDhcpDhcpcdPrivate *priv = NM_DHCP_DHCPCD_GET_PRIVATE (client);
GPtrArray *argv = NULL;
pid_t pid = -1;
GError *error = NULL;
char *pid_contents = NULL, *binary_name, *cmd_str;
const char *iface, *dhcpcd_path = NULL;
g_return_val_if_fail (priv->pid_file == NULL, FALSE);
iface = nm_dhcp_client_get_iface (client);
/* dhcpcd does not allow custom pidfiles; the pidfile is always
* RUNDIR "dhcpcd-<ifname>.pid".
*/
priv->pid_file = g_strdup_printf (RUNDIR "/dhcpcd-%s.pid", iface);
dhcpcd_path = nm_dhcp_dhcpcd_get_path ();
if (!dhcpcd_path) {
nm_log_warn (LOGD_DHCP4, "dhcpcd could not be found");
return FALSE;
}
/* Kill any existing dhcpcd from the pidfile */
binary_name = g_path_get_basename (dhcpcd_path);
nm_dhcp_client_stop_existing (priv->pid_file, binary_name);
g_free (binary_name);
argv = g_ptr_array_new ();
g_ptr_array_add (argv, (gpointer) dhcpcd_path);
g_ptr_array_add (argv, (gpointer) "-B"); /* Don't background on lease (disable fork()) */
g_ptr_array_add (argv, (gpointer) "-K"); /* Disable built-in carrier detection */
g_ptr_array_add (argv, (gpointer) "-L"); /* Disable built-in IPv4LL since we use avahi-autoipd */
/* --noarp. Don't request or claim the address by ARP; this also disables IPv4LL. */
g_ptr_array_add (argv, (gpointer) "-A");
g_ptr_array_add (argv, (gpointer) "-G"); /* Let NM handle routing */
g_ptr_array_add (argv, (gpointer) "-c"); /* Set script file */
g_ptr_array_add (argv, (gpointer) nm_dhcp_helper_path);
#ifdef DHCPCD_SUPPORTS_IPV6
/* IPv4-only for now. NetworkManager knows better than dhcpcd when to
* run IPv6, and dhcpcd's automatic Router Solicitations cause problems
* with devices that don't expect them.
*/
g_ptr_array_add (argv, (gpointer) "-4");
#endif
if (hostname && strlen (hostname)) {
g_ptr_array_add (argv, (gpointer) "-h"); /* Send hostname to DHCP server */
g_ptr_array_add (argv, (gpointer) hostname );
}
g_ptr_array_add (argv, (gpointer) iface);
g_ptr_array_add (argv, NULL);
cmd_str = g_strjoinv (" ", (gchar **) argv->pdata);
nm_log_dbg (LOGD_DHCP4, "running: %s", cmd_str);
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,
&dhcpcd_child_setup, NULL, &pid, &error)) {
g_assert (pid > 0);
nm_log_info (LOGD_DHCP4, "dhcpcd started with pid %d", pid);
nm_dhcp_client_watch_child (client, pid);
} else {
nm_log_warn (LOGD_DHCP4, "dhcpcd failed to start. error: '%s'", error->message);
g_error_free (error);
}
g_free (pid_contents);
g_ptr_array_free (argv, TRUE);
return pid > 0 ? TRUE : FALSE;
}
static gboolean
ip6_start (NMDhcpClient *client,
const char *dhcp_anycast_addr,
const char *hostname,
gboolean info_only,
NMSettingIP6ConfigPrivacy privacy,
const GByteArray *duid)
{
nm_log_warn (LOGD_DHCP6, "the dhcpcd backend does not support IPv6.");
return FALSE;
}
static void
stop (NMDhcpClient *client, gboolean release, const GByteArray *duid)
{
NMDhcpDhcpcdPrivate *priv = NM_DHCP_DHCPCD_GET_PRIVATE (client);
/* Chain up to parent */
NM_DHCP_CLIENT_CLASS (nm_dhcp_dhcpcd_parent_class)->stop (client, release, duid);
if (priv->pid_file) {
if (remove (priv->pid_file) == -1)
nm_log_dbg (LOGD_DHCP, "Could not remove dhcp pid file \"%s\": %d (%s)", priv->pid_file, errno, g_strerror (errno));
}
/* FIXME: implement release... */
}
/***************************************************/
static void
nm_dhcp_dhcpcd_init (NMDhcpDhcpcd *self)
{
g_signal_connect (nm_dhcp_listener_get (),
NM_DHCP_LISTENER_EVENT,
G_CALLBACK (nm_dhcp_client_handle_event),
self);
}
static void
dispose (GObject *object)
{
NMDhcpDhcpcdPrivate *priv = NM_DHCP_DHCPCD_GET_PRIVATE (object);
g_signal_handlers_disconnect_by_func (nm_dhcp_listener_get (),
G_CALLBACK (nm_dhcp_client_handle_event),
NM_DHCP_DHCPCD (object));
g_free (priv->pid_file);
G_OBJECT_CLASS (nm_dhcp_dhcpcd_parent_class)->dispose (object);
}
static void
nm_dhcp_dhcpcd_class_init (NMDhcpDhcpcdClass *dhcpcd_class)
{
NMDhcpClientClass *client_class = NM_DHCP_CLIENT_CLASS (dhcpcd_class);
GObjectClass *object_class = G_OBJECT_CLASS (dhcpcd_class);
g_type_class_add_private (dhcpcd_class, sizeof (NMDhcpDhcpcdPrivate));
/* virtual methods */
object_class->dispose = dispose;
client_class->ip4_start = ip4_start;
client_class->ip6_start = ip6_start;
client_class->stop = stop;
}
static void __attribute__((constructor))
register_dhcp_dhclient (void)
{
g_type_init ();
_nm_dhcp_client_register (NM_TYPE_DHCP_DHCPCD,
"dhcpcd",
nm_dhcp_dhcpcd_get_path,
NULL);
}
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