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NetworkManager/src/dhcp/nm-dhcp-systemd.c
Thomas Haller de62da297e all: drop explicit casts from _GET_PRIVATE() macro calls 
The _GET_PRIVATE() macros are all implemented based on
_NM_GET_PRIVATE(). That macro tries to be more type safe and uses
_Generic() to do the right thing. Explicitly casting is not only
unnecessary, it defeats these (static) type checks.

Don't do that.
2020-02-14 11:04:46 +01:00

1112 lines
36 KiB
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// SPDX-License-Identifier: LGPL-2.1+
/*
* Copyright (C) 2014 Red Hat, Inc.
*/
#include "nm-default.h"
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <net/if_arp.h>
#include "nm-glib-aux/nm-dedup-multi.h"
#include "nm-std-aux/unaligned.h"
#include "nm-utils.h"
#include "nm-dhcp-utils.h"
#include "nm-dhcp-options.h"
#include "nm-core-utils.h"
#include "NetworkManagerUtils.h"
#include "platform/nm-platform.h"
#include "nm-dhcp-client-logging.h"
#include "systemd/nm-sd.h"
#include "systemd/nm-sd-utils-dhcp.h"
/*****************************************************************************/
#define NM_TYPE_DHCP_SYSTEMD (nm_dhcp_systemd_get_type ())
#define NM_DHCP_SYSTEMD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), NM_TYPE_DHCP_SYSTEMD, NMDhcpSystemd))
#define NM_DHCP_SYSTEMD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), NM_TYPE_DHCP_SYSTEMD, NMDhcpSystemdClass))
#define NM_IS_DHCP_SYSTEMD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), NM_TYPE_DHCP_SYSTEMD))
#define NM_IS_DHCP_SYSTEMD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), NM_TYPE_DHCP_SYSTEMD))
#define NM_DHCP_SYSTEMD_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), NM_TYPE_DHCP_SYSTEMD, NMDhcpSystemdClass))
typedef struct _NMDhcpSystemd NMDhcpSystemd;
typedef struct _NMDhcpSystemdClass NMDhcpSystemdClass;
static GType nm_dhcp_systemd_get_type (void);
/*****************************************************************************/
typedef struct {
sd_dhcp_client *client4;
sd_dhcp6_client *client6;
char *lease_file;
guint request_count;
bool privacy:1;
} NMDhcpSystemdPrivate;
struct _NMDhcpSystemd {
NMDhcpClient parent;
NMDhcpSystemdPrivate _priv;
};
struct _NMDhcpSystemdClass {
NMDhcpClientClass parent;
};
G_DEFINE_TYPE (NMDhcpSystemd, nm_dhcp_systemd, NM_TYPE_DHCP_CLIENT)
#define NM_DHCP_SYSTEMD_GET_PRIVATE(self) _NM_GET_PRIVATE (self, NMDhcpSystemd, NM_IS_DHCP_SYSTEMD)
/*****************************************************************************/
static NMIP4Config *
lease_to_ip4_config (NMDedupMultiIndex *multi_idx,
const char *iface,
int ifindex,
sd_dhcp_lease *lease,
guint32 route_table,
guint32 route_metric,
GHashTable **out_options,
GError **error)
{
gs_unref_object NMIP4Config *ip4_config = NULL;
gs_unref_hashtable GHashTable *options = NULL;
const struct in_addr *addr_list;
char addr_str[NM_UTILS_INET_ADDRSTRLEN];
const char *s;
nm_auto_free_gstring GString *str = NULL;
gs_free sd_dhcp_route **routes = NULL;
const char *const*search_domains = NULL;
guint16 mtu;
int i, num;
const void *data;
gsize data_len;
gboolean metered = FALSE;
gboolean has_router_from_classless = FALSE;
gboolean has_classless_route = FALSE;
gboolean has_static_route = FALSE;
const gint32 ts = nm_utils_get_monotonic_timestamp_sec ();
gint64 ts_time = time (NULL);
struct in_addr a_address;
struct in_addr a_netmask;
struct in_addr a_next_server;
struct in_addr server_id;
struct in_addr broadcast;
const struct in_addr *a_router;
guint32 a_plen;
guint32 a_lifetime;
guint32 renewal;
guint32 rebinding;
gs_free nm_sd_dhcp_option *private_options = NULL;
g_return_val_if_fail (lease != NULL, NULL);
if (sd_dhcp_lease_get_address (lease, &a_address) < 0) {
nm_utils_error_set_literal (error, NM_UTILS_ERROR_UNKNOWN, "could not get address from lease");
return NULL;
}
if (sd_dhcp_lease_get_netmask (lease, &a_netmask) < 0) {
nm_utils_error_set_literal (error, NM_UTILS_ERROR_UNKNOWN, "could not get netmask from lease");
return NULL;
}
if (sd_dhcp_lease_get_lifetime (lease, &a_lifetime) < 0) {
nm_utils_error_set_literal (error, NM_UTILS_ERROR_UNKNOWN, "could not get lifetime from lease");
return NULL;
}
ip4_config = nm_ip4_config_new (multi_idx, ifindex);
options = out_options ? nm_dhcp_option_create_options_dict () : NULL;
_nm_utils_inet4_ntop (a_address.s_addr, addr_str);
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_NM_IP_ADDRESS,
addr_str);
a_plen = nm_utils_ip4_netmask_to_prefix (a_netmask.s_addr);
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_SUBNET_MASK,
_nm_utils_inet4_ntop (a_netmask.s_addr, addr_str));
nm_dhcp_option_add_option_u64 (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_IP_ADDRESS_LEASE_TIME,
a_lifetime);
nm_dhcp_option_add_option_u64 (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_NM_EXPIRY,
(guint64) (ts_time + a_lifetime));
if (sd_dhcp_lease_get_next_server (lease, &a_next_server) == 0) {
_nm_utils_inet4_ntop (a_next_server.s_addr, addr_str);
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_NM_NEXT_SERVER,
addr_str);
}
nm_ip4_config_add_address (ip4_config,
&((const NMPlatformIP4Address) {
.address = a_address.s_addr,
.peer_address = a_address.s_addr,
.plen = a_plen,
.addr_source = NM_IP_CONFIG_SOURCE_DHCP,
.timestamp = ts,
.lifetime = a_lifetime,
.preferred = a_lifetime,
}));
if (sd_dhcp_lease_get_server_identifier (lease, &server_id) >= 0) {
_nm_utils_inet4_ntop (server_id.s_addr, addr_str);
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_SERVER_ID,
addr_str);
}
if (sd_dhcp_lease_get_broadcast (lease, &broadcast) >= 0) {
_nm_utils_inet4_ntop (broadcast.s_addr, addr_str);
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_BROADCAST,
addr_str);
}
num = sd_dhcp_lease_get_dns (lease, &addr_list);
if (num > 0) {
nm_gstring_prepare (&str);
for (i = 0; i < num; i++) {
_nm_utils_inet4_ntop (addr_list[i].s_addr, addr_str);
g_string_append (nm_gstring_add_space_delimiter (str), addr_str);
if ( addr_list[i].s_addr == 0
|| nm_ip4_addr_is_localhost (addr_list[i].s_addr)) {
/* Skip localhost addresses, like also networkd does.
* See https://github.com/systemd/systemd/issues/4524. */
continue;
}
nm_ip4_config_add_nameserver (ip4_config, addr_list[i].s_addr);
}
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_DOMAIN_NAME_SERVER,
str->str);
}
num = sd_dhcp_lease_get_search_domains (lease, (char ***) &search_domains);
if (num > 0) {
nm_gstring_prepare (&str);
for (i = 0; i < num; i++) {
g_string_append (nm_gstring_add_space_delimiter (str), search_domains[i]);
nm_ip4_config_add_search (ip4_config, search_domains[i]);
}
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_DOMAIN_SEARCH_LIST,
str->str);
}
if (sd_dhcp_lease_get_domainname (lease, &s) >= 0) {
gs_strfreev char **domains = NULL;
char **d;
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_DOMAIN_NAME,
s);
/* Multiple domains sometimes stuffed into option 15 "Domain Name".
* As systemd escapes such characters, split them at \\032. */
domains = g_strsplit (s, "\\032", 0);
for (d = domains; *d; d++)
nm_ip4_config_add_domain (ip4_config, *d);
}
if (sd_dhcp_lease_get_hostname (lease, &s) >= 0) {
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_HOST_NAME,
s);
}
num = sd_dhcp_lease_get_routes (lease, &routes);
if (num > 0) {
nm_auto_free_gstring GString *str_classless = NULL;
nm_auto_free_gstring GString *str_static = NULL;
guint32 default_route_metric = route_metric;
for (i = 0; i < num; i++) {
switch (sd_dhcp_route_get_option (routes[i])) {
case NM_DHCP_OPTION_DHCP4_CLASSLESS_STATIC_ROUTE:
has_classless_route = TRUE;
break;
case NM_DHCP_OPTION_DHCP4_STATIC_ROUTE:
has_static_route = TRUE;
break;
}
}
if (has_classless_route)
str_classless = g_string_sized_new (30);
if (has_static_route)
str_static = g_string_sized_new (30);
for (i = 0; i < num; i++) {
char network_net_str[NM_UTILS_INET_ADDRSTRLEN];
char gateway_str[NM_UTILS_INET_ADDRSTRLEN];
guint8 r_plen;
struct in_addr r_network;
struct in_addr r_gateway;
in_addr_t network_net;
int option;
guint32 m;
option = sd_dhcp_route_get_option (routes[i]);
if (!NM_IN_SET (option, NM_DHCP_OPTION_DHCP4_CLASSLESS_STATIC_ROUTE,
NM_DHCP_OPTION_DHCP4_STATIC_ROUTE))
continue;
if (sd_dhcp_route_get_destination (routes[i], &r_network) < 0)
continue;
if ( sd_dhcp_route_get_destination_prefix_length (routes[i], &r_plen) < 0
|| r_plen > 32)
continue;
if (sd_dhcp_route_get_gateway (routes[i], &r_gateway) < 0)
continue;
network_net = nm_utils_ip4_address_clear_host_address (r_network.s_addr,
r_plen);
_nm_utils_inet4_ntop (network_net, network_net_str);
_nm_utils_inet4_ntop (r_gateway.s_addr, gateway_str);
g_string_append_printf (nm_gstring_add_space_delimiter ( option == NM_DHCP_OPTION_DHCP4_CLASSLESS_STATIC_ROUTE
? str_classless
: str_static),
"%s/%d %s",
network_net_str,
(int) r_plen,
gateway_str);
if ( option == NM_DHCP_OPTION_DHCP4_STATIC_ROUTE
&& has_classless_route) {
/* RFC 3443: if the DHCP server returns both a Classless Static Routes
* option and a Static Routes option, the DHCP client MUST ignore the
* Static Routes option. */
continue;
}
if ( r_plen == 0
&& option == NM_DHCP_OPTION_DHCP4_STATIC_ROUTE) {
/* for option 33 (static route), RFC 2132 says:
*
* The default route (0.0.0.0) is an illegal destination for a static
* route. */
continue;
}
if (r_plen == 0) {
/* if there are multiple default routes, we add them with differing
* metrics. */
m = default_route_metric;
if (default_route_metric < G_MAXUINT32)
default_route_metric++;
has_router_from_classless = TRUE;
} else
m = route_metric;
nm_ip4_config_add_route (ip4_config,
&((const NMPlatformIP4Route) {
.network = network_net,
.plen = r_plen,
.gateway = r_gateway.s_addr,
.rt_source = NM_IP_CONFIG_SOURCE_DHCP,
.metric = m,
.table_coerced = nm_platform_route_table_coerce (route_table),
}),
NULL);
}
if (str_classless && str_classless->len > 0)
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_CLASSLESS_STATIC_ROUTE,
str_classless->str);
if (str_static && str_static->len > 0)
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_STATIC_ROUTE,
str_static->str);
}
num = sd_dhcp_lease_get_router (lease, &a_router);
if (num > 0) {
guint32 default_route_metric = route_metric;
nm_gstring_prepare (&str);
for (i = 0; i < num; i++) {
guint32 m;
s = _nm_utils_inet4_ntop (a_router[i].s_addr, addr_str);
g_string_append (nm_gstring_add_space_delimiter (str), s);
if (a_router[i].s_addr == 0) {
/* silently skip 0.0.0.0 */
continue;
}
if (has_router_from_classless) {
/* If the DHCP server returns both a Classless Static Routes option and a
* Router option, the DHCP client MUST ignore the Router option [RFC 3442].
*
* Be more lenient and ignore the Router option only if Classless Static
* Routes contain a default gateway (as other DHCP backends do).
*/
continue;
}
/* if there are multiple default routes, we add them with differing
* metrics. */
m = default_route_metric;
if (default_route_metric < G_MAXUINT32)
default_route_metric++;
nm_ip4_config_add_route (ip4_config,
&((const NMPlatformIP4Route) {
.rt_source = NM_IP_CONFIG_SOURCE_DHCP,
.gateway = a_router[i].s_addr,
.table_coerced = nm_platform_route_table_coerce (route_table),
.metric = m,
}),
NULL);
}
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_ROUTER,
str->str);
}
if ( sd_dhcp_lease_get_mtu (lease, &mtu) >= 0
&& mtu) {
nm_dhcp_option_add_option_u64 (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_INTERFACE_MTU,
mtu);
nm_ip4_config_set_mtu (ip4_config, mtu, NM_IP_CONFIG_SOURCE_DHCP);
}
num = sd_dhcp_lease_get_ntp (lease, &addr_list);
if (num > 0) {
nm_gstring_prepare (&str);
for (i = 0; i < num; i++) {
_nm_utils_inet4_ntop (addr_list[i].s_addr, addr_str);
g_string_append (nm_gstring_add_space_delimiter (str), addr_str);
}
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_NTP_SERVER,
str->str);
}
if (sd_dhcp_lease_get_root_path (lease, &s) >= 0) {
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_ROOT_PATH,
s);
}
if (sd_dhcp_lease_get_t1 (lease, &renewal) >= 0) {
nm_dhcp_option_add_option_u64 (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_RENEWAL_T1_TIME,
renewal);
}
if (sd_dhcp_lease_get_t2 (lease, &rebinding) >= 0) {
nm_dhcp_option_add_option_u64 (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_REBINDING_T2_TIME,
rebinding);
}
if (sd_dhcp_lease_get_timezone (lease, &s) >= 0) {
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp4_options,
NM_DHCP_OPTION_DHCP4_NEW_TZDB_TIMEZONE,
s);
}
if (sd_dhcp_lease_get_vendor_specific (lease, &data, &data_len) >= 0)
metered = !!memmem (data, data_len, "ANDROID_METERED", NM_STRLEN ("ANDROID_METERED"));
nm_ip4_config_set_metered (ip4_config, metered);
num = nm_sd_dhcp_lease_get_private_options (lease, &private_options);
if (num > 0) {
for (i = 0; i < num; i++) {
char *option_string;
option_string = nm_utils_bin2hexstr_full (private_options[i].data,
private_options[i].data_len,
':', FALSE, NULL);
if (!options) {
g_free (option_string);
continue;
}
nm_dhcp_option_take_option (options,
_nm_dhcp_option_dhcp4_options,
private_options[i].code,
option_string);
}
}
NM_SET_OUT (out_options, g_steal_pointer (&options));
return g_steal_pointer (&ip4_config);
}
/*****************************************************************************/
static void
bound4_handle (NMDhcpSystemd *self, gboolean extended)
{
NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (self);
const char *iface = nm_dhcp_client_get_iface (NM_DHCP_CLIENT (self));
sd_dhcp_lease *lease;
gs_unref_object NMIP4Config *ip4_config = NULL;
gs_unref_hashtable GHashTable *options = NULL;
GError *error = NULL;
if ( sd_dhcp_client_get_lease (priv->client4, &lease) < 0
|| !lease) {
_LOGW ("no lease!");
nm_dhcp_client_set_state (NM_DHCP_CLIENT (self), NM_DHCP_STATE_FAIL, NULL, NULL);
return;
}
_LOGD ("lease available");
ip4_config = lease_to_ip4_config (nm_dhcp_client_get_multi_idx (NM_DHCP_CLIENT (self)),
iface,
nm_dhcp_client_get_ifindex (NM_DHCP_CLIENT (self)),
lease,
nm_dhcp_client_get_route_table (NM_DHCP_CLIENT (self)),
nm_dhcp_client_get_route_metric (NM_DHCP_CLIENT (self)),
&options,
&error);
if (!ip4_config) {
_LOGW ("%s", error->message);
g_clear_error (&error);
nm_dhcp_client_set_state (NM_DHCP_CLIENT (self), NM_DHCP_STATE_FAIL, NULL, NULL);
return;
}
nm_dhcp_option_add_requests_to_options (options, _nm_dhcp_option_dhcp4_options);
dhcp_lease_save (lease, priv->lease_file);
nm_dhcp_client_set_state (NM_DHCP_CLIENT (self),
extended ? NM_DHCP_STATE_EXTENDED : NM_DHCP_STATE_BOUND,
NM_IP_CONFIG_CAST (ip4_config),
options);
}
static int
dhcp_event_cb (sd_dhcp_client *client, int event, gpointer user_data)
{
NMDhcpSystemd *self = NM_DHCP_SYSTEMD (user_data);
NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (self);
nm_assert (priv->client4 == client);
_LOGD ("client event %d", event);
switch (event) {
case SD_DHCP_CLIENT_EVENT_EXPIRED:
nm_dhcp_client_set_state (NM_DHCP_CLIENT (user_data), NM_DHCP_STATE_EXPIRE, NULL, NULL);
break;
case SD_DHCP_CLIENT_EVENT_STOP:
nm_dhcp_client_set_state (NM_DHCP_CLIENT (user_data), NM_DHCP_STATE_FAIL, NULL, NULL);
break;
case SD_DHCP_CLIENT_EVENT_RENEW:
case SD_DHCP_CLIENT_EVENT_IP_CHANGE:
bound4_handle (self, TRUE);
break;
case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE:
bound4_handle (self, FALSE);
break;
case SD_DHCP_CLIENT_EVENT_SELECTING:
break;
default:
_LOGW ("unhandled DHCP event %d", event);
break;
}
return 0;
}
static gboolean
ip4_start (NMDhcpClient *client,
const char *dhcp_anycast_addr,
const char *last_ip4_address,
GError **error)
{
nm_auto (sd_dhcp_client_unrefp) sd_dhcp_client *sd_client = NULL;
NMDhcpSystemd *self = NM_DHCP_SYSTEMD (client);
NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (self);
gs_free char *lease_file = NULL;
GBytes *hwaddr;
const uint8_t *hwaddr_arr;
gsize hwaddr_len;
int arp_type;
GBytes *client_id;
gs_unref_bytes GBytes *client_id_new = NULL;
const uint8_t *client_id_arr;
size_t client_id_len;
struct in_addr last_addr = { 0 };
const char *hostname;
int r, i;
g_return_val_if_fail (!priv->client4, FALSE);
g_return_val_if_fail (!priv->client6, FALSE);
r = sd_dhcp_client_new (&sd_client, FALSE);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to create dhcp-client: %s");
return FALSE;
}
_LOGT ("dhcp-client4: set %p", sd_client);
r = sd_dhcp_client_attach_event (sd_client, NULL, 0);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to attach event: %s");
return FALSE;
}
hwaddr = nm_dhcp_client_get_hw_addr (client);
if ( !hwaddr
|| !(hwaddr_arr = g_bytes_get_data (hwaddr, &hwaddr_len))
|| (arp_type = nm_utils_arp_type_detect_from_hwaddrlen (hwaddr_len)) < 0) {
nm_utils_error_set_literal (error, NM_UTILS_ERROR_UNKNOWN, "invalid MAC address");
return FALSE;
}
r = sd_dhcp_client_set_mac (sd_client,
hwaddr_arr,
hwaddr_len,
(guint16) arp_type);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to set MAC address: %s");
return FALSE;
}
r = sd_dhcp_client_set_ifindex (sd_client,
nm_dhcp_client_get_ifindex (client));
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to set ifindex: %s");
return FALSE;
}
nm_dhcp_utils_get_leasefile_path (AF_INET,
"internal",
nm_dhcp_client_get_iface (client),
nm_dhcp_client_get_uuid (client),
&lease_file);
if (last_ip4_address)
inet_pton (AF_INET, last_ip4_address, &last_addr);
else {
nm_auto (sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL;
dhcp_lease_load (&lease, lease_file);
if (lease)
sd_dhcp_lease_get_address (lease, &last_addr);
}
if (last_addr.s_addr) {
r = sd_dhcp_client_set_request_address (sd_client, &last_addr);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to set last IPv4 address: %s");
return FALSE;
}
}
client_id = nm_dhcp_client_get_client_id (client);
if (!client_id) {
client_id_new = nm_utils_dhcp_client_id_mac (arp_type, hwaddr_arr, hwaddr_len);
client_id = client_id_new;
}
if ( !(client_id_arr = g_bytes_get_data (client_id, &client_id_len))
|| client_id_len < 2) {
/* invalid client-ids are not expected. */
nm_assert_not_reached ();
nm_utils_error_set_literal (error, NM_UTILS_ERROR_UNKNOWN, "no valid IPv4 client-id");
return FALSE;
}
/* Note that we always set a client-id. In particular for infiniband that is necessary,
* see https://tools.ietf.org/html/rfc4390#section-2.1 . */
r = sd_dhcp_client_set_client_id (sd_client,
client_id_arr[0],
client_id_arr + 1,
NM_MIN (client_id_len - 1, _NM_SD_MAX_CLIENT_ID_LEN));
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to set IPv4 client-id: %s");
return FALSE;
}
/* Add requested options */
for (i = 0; _nm_dhcp_option_dhcp4_options[i].name; i++) {
if (_nm_dhcp_option_dhcp4_options[i].include) {
nm_assert (_nm_dhcp_option_dhcp4_options[i].option_num <= 255);
r = sd_dhcp_client_set_request_option (sd_client, _nm_dhcp_option_dhcp4_options[i].option_num);
nm_assert (r >= 0 || r == -EEXIST);
}
}
hostname = nm_dhcp_client_get_hostname (client);
if (hostname) {
/* FIXME: sd-dhcp decides which hostname/FQDN option to send (12 or 81)
* only based on whether the hostname has a domain part or not. At the
* moment there is no way to force one or another.
*/
r = sd_dhcp_client_set_hostname (sd_client, hostname);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to set DHCP hostname: %s");
return FALSE;
}
}
r = sd_dhcp_client_set_callback (sd_client, dhcp_event_cb, client);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to set callback: %s");
return FALSE;
}
priv->client4 = g_steal_pointer (&sd_client);
g_free (priv->lease_file);
priv->lease_file = g_steal_pointer (&lease_file);
nm_dhcp_client_set_client_id (client, client_id);
r = sd_dhcp_client_start (priv->client4);
if (r < 0) {
sd_dhcp_client_set_callback (priv->client4, NULL, NULL);
nm_clear_pointer (&priv->client4, sd_dhcp_client_unref);
nm_utils_error_set_errno (error, r, "failed to start DHCP client: %s");
return FALSE;
}
nm_dhcp_client_start_timeout (client);
return TRUE;
}
static NMIP6Config *
lease_to_ip6_config (NMDedupMultiIndex *multi_idx,
const char *iface,
int ifindex,
sd_dhcp6_lease *lease,
gboolean info_only,
GHashTable **out_options,
gint32 ts,
GError **error)
{
gs_unref_object NMIP6Config *ip6_config = NULL;
gs_unref_hashtable GHashTable *options = NULL;
struct in6_addr tmp_addr, *dns;
uint32_t lft_pref, lft_valid;
char addr_str[NM_UTILS_INET_ADDRSTRLEN];
char **domains;
nm_auto_free_gstring GString *str = NULL;
int num, i;
g_return_val_if_fail (lease, NULL);
ip6_config = nm_ip6_config_new (multi_idx, ifindex);
options = out_options ? nm_dhcp_option_create_options_dict () : NULL;
sd_dhcp6_lease_reset_address_iter (lease);
nm_gstring_prepare (&str);
while (sd_dhcp6_lease_get_address (lease, &tmp_addr, &lft_pref, &lft_valid) >= 0) {
const NMPlatformIP6Address address = {
.plen = 128,
.address = tmp_addr,
.timestamp = ts,
.lifetime = lft_valid,
.preferred = lft_pref,
.addr_source = NM_IP_CONFIG_SOURCE_DHCP,
};
nm_ip6_config_add_address (ip6_config, &address);
_nm_utils_inet6_ntop (&tmp_addr, addr_str);
g_string_append (nm_gstring_add_space_delimiter (str), addr_str);
};
if (str->len)
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp6_options,
NM_DHCP_OPTION_DHCP6_NM_IP_ADDRESS,
str->str);
if ( !info_only
&& nm_ip6_config_get_num_addresses (ip6_config) == 0) {
g_set_error_literal (error,
NM_MANAGER_ERROR,
NM_MANAGER_ERROR_FAILED,
"no address received in managed mode");
return NULL;
}
num = sd_dhcp6_lease_get_dns (lease, &dns);
if (num > 0) {
nm_gstring_prepare (&str);
for (i = 0; i < num; i++) {
_nm_utils_inet6_ntop (&dns[i], addr_str);
g_string_append (nm_gstring_add_space_delimiter (str), addr_str);
nm_ip6_config_add_nameserver (ip6_config, &dns[i]);
}
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp6_options,
NM_DHCP_OPTION_DHCP6_DNS_SERVERS,
str->str);
}
num = sd_dhcp6_lease_get_domains (lease, &domains);
if (num > 0) {
nm_gstring_prepare (&str);
for (i = 0; i < num; i++) {
g_string_append (nm_gstring_add_space_delimiter (str), domains[i]);
nm_ip6_config_add_search (ip6_config, domains[i]);
}
nm_dhcp_option_add_option (options,
_nm_dhcp_option_dhcp6_options,
NM_DHCP_OPTION_DHCP6_DOMAIN_LIST,
str->str);
}
NM_SET_OUT (out_options, g_steal_pointer (&options));
return g_steal_pointer (&ip6_config);
}
static void
bound6_handle (NMDhcpSystemd *self)
{
NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (self);
const gint32 ts = nm_utils_get_monotonic_timestamp_sec ();
const char *iface = nm_dhcp_client_get_iface (NM_DHCP_CLIENT (self));
gs_unref_object NMIP6Config *ip6_config = NULL;
gs_unref_hashtable GHashTable *options = NULL;
gs_free_error GError *error = NULL;
NMPlatformIP6Address prefix = { 0 };
sd_dhcp6_lease *lease;
if ( sd_dhcp6_client_get_lease (priv->client6, &lease) < 0
|| !lease) {
_LOGW (" no lease!");
nm_dhcp_client_set_state (NM_DHCP_CLIENT (self), NM_DHCP_STATE_FAIL, NULL, NULL);
return;
}
_LOGD ("lease available");
ip6_config = lease_to_ip6_config (nm_dhcp_client_get_multi_idx (NM_DHCP_CLIENT (self)),
iface,
nm_dhcp_client_get_ifindex (NM_DHCP_CLIENT (self)),
lease,
nm_dhcp_client_get_info_only (NM_DHCP_CLIENT (self)),
&options,
ts,
&error);
if (!ip6_config) {
_LOGW ("%s", error->message);
nm_dhcp_client_set_state (NM_DHCP_CLIENT (self), NM_DHCP_STATE_FAIL, NULL, NULL);
return;
}
nm_dhcp_client_set_state (NM_DHCP_CLIENT (self),
NM_DHCP_STATE_BOUND,
NM_IP_CONFIG_CAST (ip6_config),
options);
sd_dhcp6_lease_reset_pd_prefix_iter (lease);
while (!sd_dhcp6_lease_get_pd (lease,
&prefix.address,
&prefix.plen,
&prefix.preferred,
&prefix.lifetime)) {
prefix.timestamp = ts;
nm_dhcp_client_emit_ipv6_prefix_delegated (NM_DHCP_CLIENT (self), &prefix);
}
}
static void
dhcp6_event_cb (sd_dhcp6_client *client, int event, gpointer user_data)
{
NMDhcpSystemd *self = NM_DHCP_SYSTEMD (user_data);
NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (self);
nm_assert (priv->client6 == client);
_LOGD ("client event %d", event);
switch (event) {
case SD_DHCP6_CLIENT_EVENT_RETRANS_MAX:
nm_dhcp_client_set_state (NM_DHCP_CLIENT (user_data), NM_DHCP_STATE_TIMEOUT, NULL, NULL);
break;
case SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE:
case SD_DHCP6_CLIENT_EVENT_STOP:
nm_dhcp_client_set_state (NM_DHCP_CLIENT (user_data), NM_DHCP_STATE_FAIL, NULL, NULL);
break;
case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE:
case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST:
bound6_handle (self);
break;
default:
_LOGW ("unhandled event %d", event);
break;
}
}
static gboolean
ip6_start (NMDhcpClient *client,
const char *dhcp_anycast_addr,
const struct in6_addr *ll_addr,
NMSettingIP6ConfigPrivacy privacy,
guint needed_prefixes,
GError **error)
{
NMDhcpSystemd *self = NM_DHCP_SYSTEMD (client);
NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (self);
nm_auto (sd_dhcp6_client_unrefp) sd_dhcp6_client *sd_client = NULL;
GBytes *hwaddr;
const char *hostname;
int r, i;
const guint8 *duid_arr;
gsize duid_len;
GBytes *duid;
const uint8_t *hwaddr_arr;
gsize hwaddr_len;
int arp_type;
g_return_val_if_fail (!priv->client4, FALSE);
g_return_val_if_fail (!priv->client6, FALSE);
if ( !(duid = nm_dhcp_client_get_client_id (client))
|| !(duid_arr = g_bytes_get_data (duid, &duid_len))
|| duid_len < 2) {
nm_utils_error_set_literal (error, NM_UTILS_ERROR_UNKNOWN, "missing DUID");
g_return_val_if_reached (FALSE);
}
r = sd_dhcp6_client_new (&sd_client);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to create dhcp-client: %s");
return FALSE;
}
_LOGT ("dhcp-client6: set %p", sd_client);
if (nm_dhcp_client_get_info_only (client))
sd_dhcp6_client_set_information_request (sd_client, 1);
r = sd_dhcp6_client_set_iaid (sd_client,
nm_dhcp_client_get_iaid (client));
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to set IAID: %s");
return FALSE;
}
r = sd_dhcp6_client_set_duid (sd_client,
unaligned_read_be16 (&duid_arr[0]),
&duid_arr[2],
duid_len - 2);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to set DUID: %s");
return FALSE;
}
r = sd_dhcp6_client_attach_event (sd_client, NULL, 0);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to attach event: %s");
return FALSE;
}
hwaddr = nm_dhcp_client_get_hw_addr (client);
if ( !hwaddr
|| !(hwaddr_arr = g_bytes_get_data (hwaddr, &hwaddr_len))
|| (arp_type = nm_utils_arp_type_detect_from_hwaddrlen (hwaddr_len)) < 0) {
nm_utils_error_set_literal (error, NM_UTILS_ERROR_UNKNOWN, "invalid MAC address");
return FALSE;
}
r = sd_dhcp6_client_set_mac (sd_client,
hwaddr_arr,
hwaddr_len,
(guint16) arp_type);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to set MAC address: %s");
return FALSE;
}
r = sd_dhcp6_client_set_ifindex (sd_client,
nm_dhcp_client_get_ifindex (client));
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to set ifindex: %s");
return FALSE;
}
/* Add requested options */
for (i = 0; _nm_dhcp_option_dhcp6_options[i].name; i++) {
if (_nm_dhcp_option_dhcp6_options[i].include) {
r = sd_dhcp6_client_set_request_option (sd_client, _nm_dhcp_option_dhcp6_options[i].option_num);
nm_assert (r >= 0 || r == -EEXIST);
}
}
if (needed_prefixes > 0) {
if (needed_prefixes > 1)
_LOGW ("dhcp-client6: only one prefix request is supported");
/* FIXME: systemd-networkd API only allows to request a
* single prefix */
r = sd_dhcp6_client_set_prefix_delegation (sd_client, TRUE);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to enable prefix delegation: %s");
return FALSE;
}
}
r = sd_dhcp6_client_set_local_address (sd_client, ll_addr);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to set local address: %s");
return FALSE;
}
hostname = nm_dhcp_client_get_hostname (client);
r = sd_dhcp6_client_set_fqdn (sd_client, hostname);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to set DHCP hostname: %s");
return FALSE;
}
r = sd_dhcp6_client_set_callback (sd_client, dhcp6_event_cb, client);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to set callback: %s");
return FALSE;
}
priv->client6 = g_steal_pointer (&sd_client);
r = sd_dhcp6_client_start (priv->client6);
if (r < 0) {
sd_dhcp6_client_set_callback (priv->client6, NULL, NULL);
nm_clear_pointer (&priv->client6, sd_dhcp6_client_unref);
nm_utils_error_set_errno (error, r, "failed to start client: %s");
return FALSE;
}
nm_dhcp_client_start_timeout (client);
return TRUE;
}
static void
stop (NMDhcpClient *client, gboolean release)
{
NMDhcpSystemd *self = NM_DHCP_SYSTEMD (client);
NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (self);
int r = 0;
NM_DHCP_CLIENT_CLASS (nm_dhcp_systemd_parent_class)->stop (client, release);
_LOGT ("dhcp-client%d: stop %p",
priv->client4 ? '4' : '6',
priv->client4 ? (gpointer) priv->client4 : (gpointer) priv->client6);
if (priv->client4) {
sd_dhcp_client_set_callback (priv->client4, NULL, NULL);
r = sd_dhcp_client_stop (priv->client4);
} else if (priv->client6) {
sd_dhcp6_client_set_callback (priv->client6, NULL, NULL);
r = sd_dhcp6_client_stop (priv->client6);
}
if (r)
_LOGW ("failed to stop client (%d)", r);
}
/*****************************************************************************/
static void
nm_dhcp_systemd_init (NMDhcpSystemd *self)
{
}
static void
dispose (GObject *object)
{
NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (object);
g_clear_pointer (&priv->lease_file, g_free);
if (priv->client4) {
sd_dhcp_client_stop (priv->client4);
sd_dhcp_client_unref (priv->client4);
priv->client4 = NULL;
}
if (priv->client6) {
sd_dhcp6_client_stop (priv->client6);
sd_dhcp6_client_unref (priv->client6);
priv->client6 = NULL;
}
G_OBJECT_CLASS (nm_dhcp_systemd_parent_class)->dispose (object);
}
static void
nm_dhcp_systemd_class_init (NMDhcpSystemdClass *sdhcp_class)
{
NMDhcpClientClass *client_class = NM_DHCP_CLIENT_CLASS (sdhcp_class);
GObjectClass *object_class = G_OBJECT_CLASS (sdhcp_class);
object_class->dispose = dispose;
client_class->ip4_start = ip4_start;
client_class->ip6_start = ip6_start;
client_class->stop = stop;
}
const NMDhcpClientFactory _nm_dhcp_client_factory_systemd = {
.name = "systemd",
.get_type = nm_dhcp_systemd_get_type,
.experimental = TRUE,
};
/*****************************************************************************/
static GType
_get_type_per_addr_family (int addr_family)
{
nm_assert_addr_family (addr_family);
if (addr_family == AF_INET)
return nm_dhcp_nettools_get_type ();
return nm_dhcp_systemd_get_type ();
}
const NMDhcpClientFactory _nm_dhcp_client_factory_internal = {
.name = "internal",
.get_type_per_addr_family = _get_type_per_addr_family,
};
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