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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2017 juga <juga at riseup dot net>
*/
#include "src/core/nm-default-daemon.h"
#if WITH_DHCPCANON
#include <stdlib.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) \
(_NM_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,
GBytes *duid,
gboolean release,
pid_t *out_pid,
guint needed_prefixes,
GError **error)
{
NMDhcpDhcpcanon *self = NM_DHCP_DHCPCANON(client);
NMDhcpDhcpcanonPrivate *priv = NM_DHCP_DHCPCANON_GET_PRIVATE(self);
gs_unref_ptrarray GPtrArray *argv = NULL;
pid_t pid;
gs_free_error GError *local = NULL;
const char *iface;
const char *system_bus_address;
const char *dhcpcanon_path;
gs_free char *binary_name = NULL;
gs_free char *pid_file = NULL;
gs_free char *system_bus_address_env = NULL;
int addr_family;
g_return_val_if_fail(!priv->pid_file, FALSE);
iface = nm_dhcp_client_get_iface(client);
addr_family = nm_dhcp_client_get_addr_family(client);
dhcpcanon_path = nm_dhcp_dhcpcanon_get_path();
if (!dhcpcanon_path) {
nm_utils_error_set_literal(error, NM_UTILS_ERROR_UNKNOWN, "dhcpcanon binary not found");
return FALSE;
}
_LOGD("dhcpcanon_path: %s", dhcpcanon_path);
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);
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);
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);
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,
"dhcpcanon failed to start: %s",
local->message);
return FALSE;
}
nm_assert(pid > 0);
_LOGI("dhcpcanon started with pid %d", pid);
nm_dhcp_client_watch_child(client, pid);
priv->pid_file = g_steal_pointer(&pid_file);
return TRUE;
}
static gboolean
ip4_start(NMDhcpClient *client, GError **error)
{
return dhcpcanon_start(client, NULL, NULL, FALSE, NULL, 0, error);
}
static void
stop(NMDhcpClient *client, gboolean release)
{
NMDhcpDhcpcanon *self = NM_DHCP_DHCPCANON(client);
NMDhcpDhcpcanonPrivate *priv = NM_DHCP_DHCPCANON_GET_PRIVATE(self);
int errsv;
NM_DHCP_CLIENT_CLASS(nm_dhcp_dhcpcanon_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));
}
g_free(priv->pid_file);
priv->pid_file = NULL;
}
}
/*****************************************************************************/
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(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->stop = stop;
}
const NMDhcpClientFactory _nm_dhcp_client_factory_dhcpcanon = {
.name = "dhcpcanon",
.get_type_4 = nm_dhcp_dhcpcanon_get_type,
.get_path = nm_dhcp_dhcpcanon_get_path,
};
#endif /* WITH_DHCPCANON */
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