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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2008 Roy Marples
* Copyright (C) 2010 Dan Williams <dcbw@redhat.com>
*/
#include "nm-default.h"
#if WITH_DHCPCD
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "nm-dhcp-manager.h"
#include "nm-utils.h"
#include "NetworkManagerUtils.h"
#include "nm-dhcp-listener.h"
#include "nm-dhcp-client-logging.h"
/*****************************************************************************/
#define NM_TYPE_DHCP_DHCPCD (nm_dhcp_dhcpcd_get_type ())
#define NM_DHCP_DHCPCD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), NM_TYPE_DHCP_DHCPCD, NMDhcpDhcpcd))
#define NM_DHCP_DHCPCD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), NM_TYPE_DHCP_DHCPCD, NMDhcpDhcpcdClass))
#define NM_IS_DHCP_DHCPCD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), NM_TYPE_DHCP_DHCPCD))
#define NM_IS_DHCP_DHCPCD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), NM_TYPE_DHCP_DHCPCD))
#define NM_DHCP_DHCPCD_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), NM_TYPE_DHCP_DHCPCD, NMDhcpDhcpcdClass))
typedef struct _NMDhcpDhcpcd NMDhcpDhcpcd;
typedef struct _NMDhcpDhcpcdClass NMDhcpDhcpcdClass;
static GType nm_dhcp_dhcpcd_get_type (void);
/*****************************************************************************/
typedef struct {
char *pid_file;
NMDhcpListener *dhcp_listener;
} NMDhcpDhcpcdPrivate;
struct _NMDhcpDhcpcd {
NMDhcpClient parent;
NMDhcpDhcpcdPrivate _priv;
};
struct _NMDhcpDhcpcdClass {
NMDhcpClientClass parent;
};
G_DEFINE_TYPE (NMDhcpDhcpcd, nm_dhcp_dhcpcd, NM_TYPE_DHCP_CLIENT)
#define NM_DHCP_DHCPCD_GET_PRIVATE(self) _NM_GET_PRIVATE (self, NMDhcpDhcpcd, NM_IS_DHCP_DHCPCD)
/*****************************************************************************/
static const char *
nm_dhcp_dhcpcd_get_path (void)
{
return nm_utils_find_helper ("dhcpcd", DHCPCD_PATH, NULL);
}
static gboolean
ip4_start (NMDhcpClient *client,
const char *dhcp_anycast_addr,
const char *last_ip4_address,
GError **error)
{
NMDhcpDhcpcd *self = NM_DHCP_DHCPCD (client);
NMDhcpDhcpcdPrivate *priv = NM_DHCP_DHCPCD_GET_PRIVATE (self);
gs_unref_ptrarray GPtrArray *argv = NULL;
pid_t pid = -1;
GError *local = NULL;
gs_free char *cmd_str = NULL;
gs_free char *binary_name = NULL;
const char *iface;
const char *dhcpcd_path;
const char *hostname;
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
* RUNSTATEDIR "dhcpcd-<ifname>.pid".
*/
priv->pid_file = g_strdup_printf (RUNSTATEDIR "/dhcpcd-%s.pid", iface);
dhcpcd_path = nm_dhcp_dhcpcd_get_path ();
if (!dhcpcd_path) {
nm_utils_error_set_literal (error, NM_UTILS_ERROR_UNKNOWN, "dhcpcd binary not 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);
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 */
/* --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);
/* 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");
hostname = nm_dhcp_client_get_hostname (client);
if (hostname) {
if (nm_dhcp_client_get_use_fqdn (client)) {
g_ptr_array_add (argv, (gpointer) "-h");
g_ptr_array_add (argv, (gpointer) hostname);
g_ptr_array_add (argv, (gpointer) "-F");
g_ptr_array_add (argv, (gpointer) "both");
} else {
g_ptr_array_add (argv, (gpointer) "-h");
g_ptr_array_add (argv, (gpointer) hostname);
}
}
g_ptr_array_add (argv, (gpointer) iface);
g_ptr_array_add (argv, NULL);
_LOGD ("running: %s",
(cmd_str = g_strjoinv (" ", (char **) argv->pdata)));
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,
&local)) {
nm_utils_error_set (error,
NM_UTILS_ERROR_UNKNOWN,
"dhcpcd failed to start: %s",
local->message);
g_error_free (local);
return FALSE;
}
nm_assert (pid > 0);
_LOGI ("dhcpcd started with pid %d", pid);
nm_dhcp_client_watch_child (client, pid);
return TRUE;
}
static void
stop (NMDhcpClient *client, gboolean release)
{
NMDhcpDhcpcd *self = NM_DHCP_DHCPCD (client);
NMDhcpDhcpcdPrivate *priv = NM_DHCP_DHCPCD_GET_PRIVATE (self);
int errsv;
NM_DHCP_CLIENT_CLASS (nm_dhcp_dhcpcd_parent_class)->stop (client, release);
if (priv->pid_file) {
if (remove (priv->pid_file) == -1) {
errsv = errno;
_LOGD ("could not remove dhcp pid file \"%s\": %d (%s)", priv->pid_file, errsv, nm_strerror_native (errsv));
}
}
/* FIXME: implement release... */
}
/*****************************************************************************/
static void
nm_dhcp_dhcpcd_init (NMDhcpDhcpcd *self)
{
NMDhcpDhcpcdPrivate *priv = NM_DHCP_DHCPCD_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)
{
NMDhcpDhcpcdPrivate *priv = NM_DHCP_DHCPCD_GET_PRIVATE (object);
if (priv->dhcp_listener) {
g_signal_handlers_disconnect_by_func (priv->dhcp_listener,
G_CALLBACK (nm_dhcp_client_handle_event),
NM_DHCP_DHCPCD (object));
g_clear_object (&priv->dhcp_listener);
}
nm_clear_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);
object_class->dispose = dispose;
client_class->ip4_start = ip4_start;
client_class->stop = stop;
}
const NMDhcpClientFactory _nm_dhcp_client_factory_dhcpcd = {
.name = "dhcpcd",
.get_type = nm_dhcp_dhcpcd_get_type,
.get_path = nm_dhcp_dhcpcd_get_path,
};
#endif /* WITH_DHCPCD */
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