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Diffstat (limited to 'src/dhcp/nm-dhcp-manager.c')
| -rw-r--r-- | src/dhcp/nm-dhcp-manager.c | 426 |
1 files changed, 426 insertions, 0 deletions
diff --git a/src/dhcp/nm-dhcp-manager.c b/src/dhcp/nm-dhcp-manager.c new file mode 100644 index 000000000..6cb5c105b --- /dev/null +++ b/src/dhcp/nm-dhcp-manager.c @@ -0,0 +1,426 @@ +/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */ +/* nm-dhcp-manager.c - Handle the DHCP daemon for NetworkManager + * + * 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. + * + * Copyright (C) 2005 - 2013 Red Hat, Inc. + * Copyright (C) 2006 - 2008 Novell, Inc. + * + */ + +#include "nm-default.h" + +#include "nm-dhcp-manager.h" + +#include <sys/socket.h> +#include <sys/wait.h> +#include <signal.h> +#include <string.h> +#include <stdlib.h> +#include <errno.h> +#include <unistd.h> +#include <fcntl.h> +#include <stdio.h> + +#include "nm-config.h" +#include "NetworkManagerUtils.h" + +#define DHCP_TIMEOUT 45 /* default DHCP timeout, in seconds */ + +/*****************************************************************************/ + +typedef struct { + const NMDhcpClientFactory *client_factory; + GHashTable * clients; + char * default_hostname; +} NMDhcpManagerPrivate; + +struct _NMDhcpManager { + GObject parent; + NMDhcpManagerPrivate _priv; +}; + +struct _NMDhcpManagerClass { + GObjectClass parent; +}; + +G_DEFINE_TYPE (NMDhcpManager, nm_dhcp_manager, G_TYPE_OBJECT) + +#define NM_DHCP_MANAGER_GET_PRIVATE(self) _NM_GET_PRIVATE (self, NMDhcpManager, NM_IS_DHCP_MANAGER) + +/*****************************************************************************/ + +/* default to installed helper, but can be modified for testing */ +const char *nm_dhcp_helper_path = LIBEXECDIR "/nm-dhcp-helper"; + +/*****************************************************************************/ + +static const NMDhcpClientFactory * +_client_factory_find_by_name (const char *name) +{ + int i; + + g_return_val_if_fail (name, NULL); + + for (i = 0; i < G_N_ELEMENTS (_nm_dhcp_manager_factories); i++) { + const NMDhcpClientFactory *f = _nm_dhcp_manager_factories[i]; + + if (f && nm_streq (f->name, name)) + return f; + } + return NULL; +} + +static const NMDhcpClientFactory * +_client_factory_available (const NMDhcpClientFactory *client_factory) +{ + if ( client_factory + && (!client_factory->get_path || client_factory->get_path ())) + return client_factory; + return NULL; +} + +/*****************************************************************************/ + +static NMDhcpClient * +get_client_for_ifindex (NMDhcpManager *manager, int ifindex, gboolean ip6) +{ + NMDhcpManagerPrivate *priv; + GHashTableIter iter; + gpointer value; + + g_return_val_if_fail (NM_IS_DHCP_MANAGER (manager), NULL); + g_return_val_if_fail (ifindex > 0, NULL); + + priv = NM_DHCP_MANAGER_GET_PRIVATE (manager); + + g_hash_table_iter_init (&iter, priv->clients); + while (g_hash_table_iter_next (&iter, NULL, &value)) { + NMDhcpClient *candidate = NM_DHCP_CLIENT (value); + + if ( nm_dhcp_client_get_ifindex (candidate) == ifindex + && nm_dhcp_client_get_ipv6 (candidate) == ip6) + return candidate; + } + + return NULL; +} + +static void client_state_changed (NMDhcpClient *client, + NMDhcpState state, + GObject *ip_config, + GVariant *options, + const char *event_id, + NMDhcpManager *self); + +static void +remove_client (NMDhcpManager *self, NMDhcpClient *client) +{ + g_signal_handlers_disconnect_by_func (client, client_state_changed, self); + + /* Stopping the client is left up to the controlling device + * explicitly since we may want to quit NetworkManager but not terminate + * the DHCP client. + */ + + g_hash_table_remove (NM_DHCP_MANAGER_GET_PRIVATE (self)->clients, client); +} + +static void +client_state_changed (NMDhcpClient *client, + NMDhcpState state, + GObject *ip_config, + GVariant *options, + const char *event_id, + NMDhcpManager *self) +{ + if (state >= NM_DHCP_STATE_TIMEOUT) + remove_client (self, client); +} + +static NMDhcpClient * +client_start (NMDhcpManager *self, + const char *iface, + int ifindex, + const GByteArray *hwaddr, + const char *uuid, + guint32 priority, + gboolean ipv6, + const struct in6_addr *ipv6_ll_addr, + const char *dhcp_client_id, + guint32 timeout, + const char *dhcp_anycast_addr, + const char *hostname, + const char *fqdn, + gboolean info_only, + NMSettingIP6ConfigPrivacy privacy, + const char *last_ip4_address, + guint needed_prefixes) +{ + NMDhcpManagerPrivate *priv; + NMDhcpClient *client; + gboolean success = FALSE; + + g_return_val_if_fail (self, NULL); + g_return_val_if_fail (NM_IS_DHCP_MANAGER (self), NULL); + g_return_val_if_fail (ifindex > 0, NULL); + g_return_val_if_fail (uuid != NULL, NULL); + + priv = NM_DHCP_MANAGER_GET_PRIVATE (self); + + /* Ensure we have a usable DHCP client */ + if (!priv->client_factory) + return NULL; + + /* Kill any old client instance */ + client = get_client_for_ifindex (self, ifindex, ipv6); + if (client) { + g_object_ref (client); + remove_client (self, client); + nm_dhcp_client_stop (client, FALSE); + g_object_unref (client); + } + + /* And make a new one */ + client = g_object_new (priv->client_factory->get_type (), + NM_DHCP_CLIENT_INTERFACE, iface, + NM_DHCP_CLIENT_IFINDEX, ifindex, + NM_DHCP_CLIENT_HWADDR, hwaddr, + NM_DHCP_CLIENT_IPV6, ipv6, + NM_DHCP_CLIENT_UUID, uuid, + NM_DHCP_CLIENT_PRIORITY, priority, + NM_DHCP_CLIENT_TIMEOUT, timeout ? timeout : DHCP_TIMEOUT, + NULL); + g_hash_table_insert (NM_DHCP_MANAGER_GET_PRIVATE (self)->clients, client, g_object_ref (client)); + g_signal_connect (client, NM_DHCP_CLIENT_SIGNAL_STATE_CHANGED, G_CALLBACK (client_state_changed), self); + + if (ipv6) + success = nm_dhcp_client_start_ip6 (client, dhcp_anycast_addr, ipv6_ll_addr, hostname, info_only, privacy, needed_prefixes); + else + success = nm_dhcp_client_start_ip4 (client, dhcp_client_id, dhcp_anycast_addr, hostname, fqdn, last_ip4_address); + + if (!success) { + remove_client (self, client); + client = NULL; + } + + return client; +} + +static const char * +get_send_hostname (NMDhcpManager *self, const char *setting_hostname) +{ + NMDhcpManagerPrivate *priv = NM_DHCP_MANAGER_GET_PRIVATE (self); + + /* Always prefer the explicit dhcp-send-hostname if given */ + return setting_hostname ? setting_hostname : priv->default_hostname; +} + +/* Caller owns a reference to the NMDhcpClient on return */ +NMDhcpClient * +nm_dhcp_manager_start_ip4 (NMDhcpManager *self, + const char *iface, + int ifindex, + const GByteArray *hwaddr, + const char *uuid, + guint32 priority, + gboolean send_hostname, + const char *dhcp_hostname, + const char *dhcp_fqdn, + const char *dhcp_client_id, + guint32 timeout, + const char *dhcp_anycast_addr, + const char *last_ip_address) +{ + const char *hostname = NULL; + const char *fqdn = NULL; + + g_return_val_if_fail (NM_IS_DHCP_MANAGER (self), NULL); + + if (send_hostname) { + hostname = get_send_hostname (self, dhcp_hostname); + fqdn = dhcp_fqdn; + } + return client_start (self, iface, ifindex, hwaddr, uuid, priority, FALSE, NULL, + dhcp_client_id, timeout, dhcp_anycast_addr, hostname, + fqdn, FALSE, 0, last_ip_address, 0); +} + +/* Caller owns a reference to the NMDhcpClient on return */ +NMDhcpClient * +nm_dhcp_manager_start_ip6 (NMDhcpManager *self, + const char *iface, + int ifindex, + const GByteArray *hwaddr, + const struct in6_addr *ll_addr, + const char *uuid, + guint32 priority, + gboolean send_hostname, + const char *dhcp_hostname, + guint32 timeout, + const char *dhcp_anycast_addr, + gboolean info_only, + NMSettingIP6ConfigPrivacy privacy, + guint needed_prefixes) +{ + const char *hostname = NULL; + + g_return_val_if_fail (NM_IS_DHCP_MANAGER (self), NULL); + + if (send_hostname) + hostname = get_send_hostname (self, dhcp_hostname); + return client_start (self, iface, ifindex, hwaddr, uuid, priority, TRUE, + ll_addr, NULL, timeout, dhcp_anycast_addr, hostname, NULL, info_only, + privacy, NULL, needed_prefixes); +} + +void +nm_dhcp_manager_set_default_hostname (NMDhcpManager *manager, const char *hostname) +{ + NMDhcpManagerPrivate *priv = NM_DHCP_MANAGER_GET_PRIVATE (manager); + + g_clear_pointer (&priv->default_hostname, g_free); + + /* Never send 'localhost'-type names to the DHCP server */ + if (!nm_utils_is_specific_hostname (hostname)) + return; + + priv->default_hostname = g_strdup (hostname); +} + +GSList * +nm_dhcp_manager_get_lease_ip_configs (NMDhcpManager *self, + const char *iface, + int ifindex, + const char *uuid, + gboolean ipv6, + guint32 default_route_metric) +{ + NMDhcpManagerPrivate *priv; + + g_return_val_if_fail (NM_IS_DHCP_MANAGER (self), NULL); + g_return_val_if_fail (iface != NULL, NULL); + g_return_val_if_fail (ifindex >= -1, NULL); + g_return_val_if_fail (uuid != NULL, NULL); + + priv = NM_DHCP_MANAGER_GET_PRIVATE (self); + if ( priv->client_factory + && priv->client_factory->get_lease_ip_configs) + return priv->client_factory->get_lease_ip_configs (iface, ifindex, uuid, ipv6, default_route_metric); + return NULL; +} + +/*****************************************************************************/ + +NM_DEFINE_SINGLETON_GETTER (NMDhcpManager, nm_dhcp_manager_get, NM_TYPE_DHCP_MANAGER); + +static void +nm_dhcp_manager_init (NMDhcpManager *self) +{ + NMDhcpManagerPrivate *priv = NM_DHCP_MANAGER_GET_PRIVATE (self); + NMConfig *config = nm_config_get (); + const char *client; + int i; + const NMDhcpClientFactory *client_factory = NULL; + + for (i = 0; i < G_N_ELEMENTS (_nm_dhcp_manager_factories); i++) { + const NMDhcpClientFactory *f = _nm_dhcp_manager_factories[i]; + + if (!f) + continue; + + nm_log_dbg (LOGD_DHCP, "dhcp-init: enabled DHCP client '%s' (%s)%s", + f->name, g_type_name (f->get_type ()), + _client_factory_available (f) ? "" : " (not available)"); + } + + /* Client-specific setup */ + client = nm_config_get_dhcp_client (config); + if (nm_config_get_configure_and_quit (config)) { + client_factory = &_nm_dhcp_client_factory_internal; + if (client && !nm_streq (client, client_factory->name)) + nm_log_info (LOGD_DHCP, "dhcp-init: Using internal DHCP client since configure-and-quit is set."); + } else { + if (client) { + client_factory = _client_factory_available (_client_factory_find_by_name (client)); + if (!client_factory) + nm_log_warn (LOGD_DHCP, "dhcp-init: DHCP client '%s' not available", client); + } + if (!client_factory) { + client_factory = _client_factory_find_by_name (""NM_CONFIG_DEFAULT_DHCP); + if (!client_factory) + nm_log_err (LOGD_DHCP, "dhcp-init: default DHCP client '%s' is not installed", NM_CONFIG_DEFAULT_DHCP); + else { + client_factory = _client_factory_available (client_factory); + if (!client_factory) + nm_log_info (LOGD_DHCP, "dhcp-init: default DHCP client '%s' is not available", NM_CONFIG_DEFAULT_DHCP); + } + } + if (!client_factory) { + for (i = 0; i < G_N_ELEMENTS (_nm_dhcp_manager_factories); i++) { + client_factory = _client_factory_available (_nm_dhcp_manager_factories[i]); + if (client_factory) + break; + } + } + } + + nm_assert (client_factory); + + nm_log_info (LOGD_DHCP, "dhcp-init: Using DHCP client '%s'", client_factory->name); + + priv->client_factory = client_factory; + priv->clients = g_hash_table_new_full (g_direct_hash, g_direct_equal, + NULL, + (GDestroyNotify) g_object_unref); +} + +static void +dispose (GObject *object) +{ + NMDhcpManagerPrivate *priv = NM_DHCP_MANAGER_GET_PRIVATE ((NMDhcpManager *) object); + GList *values, *iter; + + if (priv->clients) { + values = g_hash_table_get_values (priv->clients); + for (iter = values; iter; iter = g_list_next (iter)) + remove_client (NM_DHCP_MANAGER (object), NM_DHCP_CLIENT (iter->data)); + g_list_free (values); + } + + G_OBJECT_CLASS (nm_dhcp_manager_parent_class)->dispose (object); +} + +static void +finalize (GObject *object) +{ + NMDhcpManagerPrivate *priv = NM_DHCP_MANAGER_GET_PRIVATE ((NMDhcpManager *) object); + + g_free (priv->default_hostname); + + if (priv->clients) + g_hash_table_destroy (priv->clients); + + G_OBJECT_CLASS (nm_dhcp_manager_parent_class)->finalize (object); +} + +static void +nm_dhcp_manager_class_init (NMDhcpManagerClass *manager_class) +{ + GObjectClass *object_class = G_OBJECT_CLASS (manager_class); + + object_class->finalize = finalize; + object_class->dispose = dispose; +} |