// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2008 Roy Marples * Copyright (C) 2010 Dan Williams */ #include "nm-default.h" #if WITH_DHCPCD #include #include #include #include #include #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-.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 */