/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2008,2020 Roy Marples <roy@marples.name>
* 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 {
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);
gs_unref_ptrarray GPtrArray *argv = NULL;
pid_t pid;
GError * local;
gs_free char * cmd_str = NULL;
const char * iface;
const char * dhcpcd_path;
const char * hostname;
pid = nm_dhcp_client_get_pid(client);
g_return_val_if_fail(pid == -1, FALSE);
iface = nm_dhcp_client_get_iface(client);
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;
}
argv = g_ptr_array_new();
g_ptr_array_add(argv, (gpointer) dhcpcd_path);
/* Don't configure anything, we will do that instead.
* This requires dhcpcd-9.3.3 or newer.
* Older versions only had an option not to install a default route,
* dhcpcd still added addresses and other routes so we no longer support that
* as it doesn't fit how NetworkManager wants to work.
*/
g_ptr_array_add(argv, (gpointer) "--noconfigure");
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) "-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_STDOUT_TO_DEV_NULL | G_SPAWN_STDERR_TO_DEV_NULL
| G_SPAWN_DO_NOT_REAP_CHILD,
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);
pid_t pid;
int sig, errsv;
pid = nm_dhcp_client_get_pid(client);
sig = release ? SIGALRM : SIGTERM;
_LOGD("sending %s to dhcpcd pid %d", sig == SIGALRM ? "SIGALRM" : "SIGTERM", pid);
/* dhcpcd-9.x features privilege separation.
* It's not our job to track all these processes so we rely on dhcpcd
* to always cleanup after itself.
* Because it also re-parents itself to PID 1, the process cannot be
* reaped or waited for.
* As such, just send the correct signal.
*/
if (kill(pid, sig) == -1) {
errsv = errno;
_LOGE("failed to kill dhcpcd %d:%s", errsv, strerror(errsv));
}
/* When this function exits NM expects the PID to be -1.
* This means we also need to stop watching the pid.
* If we need to know the exit status then we need to refactor NM
* to allow a non -1 to mean we're waiting to exit still.
*/
nm_dhcp_client_stop_watch_child(client, pid);
}
/*****************************************************************************/
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);
}
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 */