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NetworkManager/src/nm-iface-helper.c
Thomas Haller 2cc1813340 core: workaround configuring IPv6 routes with "src" (RTA_PREFSRC) 
Kernel does not allow to add IPv6 routes with "src", as long as the
corresponding address is still tentative (related bug rh#1457196).

The workaround for this is cumbersome. First, when we fail to add such a
route with "pref_src", we guess that it happend due to this issue. In
that case, nm_ip6_config_commit() returns the list of routes that could
not be added for the moment (but hopefully can be added later).

We track this list in NMDevice, and keep trying to merge the routes
back into ip6_config. In order to not try indefinitely, keep track of a
timestamp when we tried to add this route for the first time.

Another uglyness is that pending tentative routes don't explicitly block
activation. In practice they may do, because for these routes we also have
an IPv6 address that is still doing DAD, so the IP configuration is
still pending due to that.

https://bugzilla.redhat.com/show_bug.cgi?id=1452684
2017-09-15 17:28:48 +02:00

600 lines
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* NetworkManager -- Network link manager
*
* 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 of the License, 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) 2014 Red Hat, Inc.
*/
#include "nm-default.h"
#include <glib-unix.h>
#include <getopt.h>
#include <locale.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <signal.h>
#include "main-utils.h"
#include "NetworkManagerUtils.h"
#include "platform/nm-linux-platform.h"
#include "platform/nm-platform-utils.h"
#include "dhcp/nm-dhcp-manager.h"
#include "ndisc/nm-ndisc.h"
#include "ndisc/nm-lndp-ndisc.h"
#include "nm-utils.h"
#include "nm-setting-ip6-config.h"
#include "systemd/nm-sd.h"
#if !defined(NM_DIST_VERSION)
# define NM_DIST_VERSION VERSION
#endif
#define NMIH_PID_FILE_FMT NMRUNDIR "/nm-iface-helper-%d.pid"
/*****************************************************************************/
static struct {
GMainLoop *main_loop;
int ifindex;
} gl/*obal*/ = {
.ifindex = -1,
};
static struct {
gboolean slaac;
gboolean show_version;
gboolean become_daemon;
gboolean debug;
gboolean g_fatal_warnings;
gboolean slaac_required;
gboolean dhcp4_required;
int tempaddr;
char *ifname;
char *uuid;
char *stable_id;
char *dhcp4_address;
char *dhcp4_clientid;
char *dhcp4_hostname;
char *dhcp4_fqdn;
char *iid_str;
NMSettingIP6ConfigAddrGenMode addr_gen_mode;
char *logging_backend;
char *opt_log_level;
char *opt_log_domains;
guint32 priority_v4;
guint32 priority_v6;
} global_opt = {
.tempaddr = NM_SETTING_IP6_CONFIG_PRIVACY_UNKNOWN,
.priority_v4 = NM_PLATFORM_ROUTE_METRIC_DEFAULT_IP4,
.priority_v6 = NM_PLATFORM_ROUTE_METRIC_DEFAULT_IP6,
};
/*****************************************************************************/
#define _NMLOG_PREFIX_NAME "nm-iface-helper"
#define _NMLOG(level, domain, ...) \
nm_log ((level), (domain), global_opt.ifname, NULL, \
"iface-helper: " _NM_UTILS_MACRO_FIRST (__VA_ARGS__) \
_NM_UTILS_MACRO_REST (__VA_ARGS__))
/*****************************************************************************/
static void
dhcp4_state_changed (NMDhcpClient *client,
NMDhcpState state,
NMIP4Config *ip4_config,
GHashTable *options,
const char *event_id,
gpointer user_data)
{
static NMIP4Config *last_config = NULL;
NMIP4Config *existing;
gs_unref_ptrarray GPtrArray *ip4_dev_route_blacklist = NULL;
g_return_if_fail (!ip4_config || NM_IS_IP4_CONFIG (ip4_config));
_LOGD (LOGD_DHCP4, "new DHCPv4 client state %d", state);
switch (state) {
case NM_DHCP_STATE_BOUND:
g_assert (ip4_config);
g_assert (nm_ip4_config_get_ifindex (ip4_config) == gl.ifindex);
existing = nm_ip4_config_capture (nm_platform_get_multi_idx (NM_PLATFORM_GET),
NM_PLATFORM_GET, gl.ifindex, FALSE);
if (last_config)
nm_ip4_config_subtract (existing, last_config);
nm_ip4_config_merge (existing, ip4_config, NM_IP_CONFIG_MERGE_DEFAULT);
nm_ip4_config_add_device_routes (existing,
global_opt.priority_v4,
&ip4_dev_route_blacklist);
if (!nm_ip4_config_commit (existing,
NM_PLATFORM_GET))
_LOGW (LOGD_DHCP4, "failed to apply DHCPv4 config");
nm_platform_ip4_dev_route_blacklist_set (NM_PLATFORM_GET,
gl.ifindex,
ip4_dev_route_blacklist);
if (last_config)
g_object_unref (last_config);
last_config = nm_ip4_config_new (nm_platform_get_multi_idx (NM_PLATFORM_GET),
nm_dhcp_client_get_ifindex (client));
nm_ip4_config_replace (last_config, ip4_config, NULL);
break;
case NM_DHCP_STATE_TIMEOUT:
case NM_DHCP_STATE_DONE:
case NM_DHCP_STATE_FAIL:
if (global_opt.dhcp4_required) {
_LOGW (LOGD_DHCP4, "DHCPv4 timed out or failed, quitting...");
g_main_loop_quit (gl.main_loop);
} else
_LOGW (LOGD_DHCP4, "DHCPv4 timed out or failed");
break;
default:
break;
}
}
static void
ndisc_config_changed (NMNDisc *ndisc, const NMNDiscData *rdata, guint changed_int, gpointer user_data)
{
NMNDiscConfigMap changed = changed_int;
static NMIP6Config *ndisc_config = NULL;
NMIP6Config *existing;
existing = nm_ip6_config_capture (nm_platform_get_multi_idx (NM_PLATFORM_GET),
NM_PLATFORM_GET, gl.ifindex, FALSE, global_opt.tempaddr);
if (ndisc_config)
nm_ip6_config_subtract (existing, ndisc_config);
else {
ndisc_config = nm_ip6_config_new (nm_platform_get_multi_idx (NM_PLATFORM_GET),
gl.ifindex);
}
if (changed & NM_NDISC_CONFIG_GATEWAYS) {
/* Use the first gateway as ordered in neighbor discovery cache. */
if (rdata->gateways_n)
nm_ip6_config_set_gateway (ndisc_config, &rdata->gateways[0].address);
else
nm_ip6_config_set_gateway (ndisc_config, NULL);
}
if (changed & NM_NDISC_CONFIG_ADDRESSES) {
guint8 plen;
guint32 ifa_flags;
/* Check, whether kernel is recent enough to help user space handling RA.
* If it's not supported, we have no ipv6-privacy and must add autoconf
* addresses as /128. The reason for the /128 is to prevent the kernel
* from adding a prefix route for this address. */
ifa_flags = 0;
if (nm_platform_check_support_kernel_extended_ifa_flags (NM_PLATFORM_GET)) {
ifa_flags |= IFA_F_NOPREFIXROUTE;
if (NM_IN_SET (global_opt.tempaddr, NM_SETTING_IP6_CONFIG_PRIVACY_PREFER_TEMP_ADDR,
NM_SETTING_IP6_CONFIG_PRIVACY_PREFER_PUBLIC_ADDR))
ifa_flags |= IFA_F_MANAGETEMPADDR;
plen = 64;
} else
plen = 128;
nm_ip6_config_reset_addresses_ndisc (ndisc_config,
rdata->addresses,
rdata->addresses_n,
plen,
ifa_flags);
}
if (changed & NM_NDISC_CONFIG_ROUTES) {
nm_ip6_config_reset_routes_ndisc (ndisc_config,
rdata->routes,
rdata->routes_n,
global_opt.priority_v6);
}
if (changed & NM_NDISC_CONFIG_DHCP_LEVEL) {
/* Unsupported until systemd DHCPv6 is ready */
}
if (changed & NM_NDISC_CONFIG_HOP_LIMIT)
nm_platform_sysctl_set_ip6_hop_limit_safe (NM_PLATFORM_GET, global_opt.ifname, rdata->hop_limit);
if (changed & NM_NDISC_CONFIG_MTU) {
char val[16];
g_snprintf (val, sizeof (val), "%d", rdata->mtu);
nm_platform_sysctl_set (NM_PLATFORM_GET, NMP_SYSCTL_PATHID_ABSOLUTE (nm_utils_ip6_property_path (global_opt.ifname, "mtu")), val);
}
nm_ip6_config_merge (existing, ndisc_config, NM_IP_CONFIG_MERGE_DEFAULT);
if (!nm_ip6_config_commit (existing, NM_PLATFORM_GET, NULL))
_LOGW (LOGD_IP6, "failed to apply IPv6 config");
}
static void
ndisc_ra_timeout (NMNDisc *ndisc, gpointer user_data)
{
if (global_opt.slaac_required) {
_LOGW (LOGD_IP6, "IPv6 timed out or failed, quitting...");
g_main_loop_quit (gl.main_loop);
} else
_LOGW (LOGD_IP6, "IPv6 timed out or failed");
}
static gboolean
quit_handler (gpointer user_data)
{
g_main_loop_quit (gl.main_loop);
return G_SOURCE_REMOVE;
}
static void
setup_signals (void)
{
signal (SIGPIPE, SIG_IGN);
g_unix_signal_add (SIGINT, quit_handler, NULL);
g_unix_signal_add (SIGTERM, quit_handler, NULL);
}
static gboolean
do_early_setup (int *argc, char **argv[])
{
gint64 priority64_v4 = -1;
gint64 priority64_v6 = -1;
GOptionEntry options[] = {
/* Interface/IP config */
{ "ifname", 'i', 0, G_OPTION_ARG_STRING, &global_opt.ifname, N_("The interface to manage"), "eth0" },
{ "uuid", 'u', 0, G_OPTION_ARG_STRING, &global_opt.uuid, N_("Connection UUID"), "661e8cd0-b618-46b8-9dc9-31a52baaa16b" },
{ "stable-id", '\0', 0, G_OPTION_ARG_STRING, &global_opt.stable_id, N_("Connection Token for Stable IDs"), "eth" },
{ "slaac", 's', 0, G_OPTION_ARG_NONE, &global_opt.slaac, N_("Whether to manage IPv6 SLAAC"), NULL },
{ "slaac-required", '6', 0, G_OPTION_ARG_NONE, &global_opt.slaac_required, N_("Whether SLAAC must be successful"), NULL },
{ "slaac-tempaddr", 't', 0, G_OPTION_ARG_INT, &global_opt.tempaddr, N_("Use an IPv6 temporary privacy address"), NULL },
{ "dhcp4", 'd', 0, G_OPTION_ARG_STRING, &global_opt.dhcp4_address, N_("Current DHCPv4 address"), NULL },
{ "dhcp4-required", '4', 0, G_OPTION_ARG_NONE, &global_opt.dhcp4_required, N_("Whether DHCPv4 must be successful"), NULL },
{ "dhcp4-clientid", 'c', 0, G_OPTION_ARG_STRING, &global_opt.dhcp4_clientid, N_("Hex-encoded DHCPv4 client ID"), NULL },
{ "dhcp4-hostname", 'h', 0, G_OPTION_ARG_STRING, &global_opt.dhcp4_hostname, N_("Hostname to send to DHCP server"), N_("barbar") },
{ "dhcp4-fqdn", 'F', 0, G_OPTION_ARG_STRING, &global_opt.dhcp4_fqdn, N_("FQDN to send to DHCP server"), N_("host.domain.org") },
{ "priority4", '\0', 0, G_OPTION_ARG_INT64, &priority64_v4, N_("Route priority for IPv4"), N_("0") },
{ "priority6", '\0', 0, G_OPTION_ARG_INT64, &priority64_v6, N_("Route priority for IPv6"), N_("1024") },
{ "iid", 'e', 0, G_OPTION_ARG_STRING, &global_opt.iid_str, N_("Hex-encoded Interface Identifier"), "" },
{ "addr-gen-mode", 'e', 0, G_OPTION_ARG_INT, &global_opt.addr_gen_mode, N_("IPv6 SLAAC address generation mode"), "eui64" },
{ "logging-backend", '\0', 0, G_OPTION_ARG_STRING, &global_opt.logging_backend, N_("The logging backend configuration value. See logging.backend in NetworkManager.conf"), NULL },
/* Logging/debugging */
{ "version", 'V', 0, G_OPTION_ARG_NONE, &global_opt.show_version, N_("Print NetworkManager version and exit"), NULL },
{ "no-daemon", 'n', G_OPTION_FLAG_REVERSE, G_OPTION_ARG_NONE, &global_opt.become_daemon, N_("Don't become a daemon"), NULL },
{ "debug", 'b', 0, G_OPTION_ARG_NONE, &global_opt.debug, N_("Don't become a daemon, and log to stderr"), NULL },
{ "log-level", 0, 0, G_OPTION_ARG_STRING, &global_opt.opt_log_level, N_("Log level: one of [%s]"), "INFO" },
{ "log-domains", 0, 0, G_OPTION_ARG_STRING, &global_opt.opt_log_domains,
N_("Log domains separated by ',': any combination of [%s]"),
"PLATFORM,RFKILL,WIFI" },
{ "g-fatal-warnings", 0, 0, G_OPTION_ARG_NONE, &global_opt.g_fatal_warnings, N_("Make all warnings fatal"), NULL },
{NULL}
};
if (!nm_main_utils_early_setup ("nm-iface-helper",
argc,
argv,
options,
NULL,
NULL,
_("nm-iface-helper is a small, standalone process that manages a single network interface.")))
return FALSE;
if (priority64_v4 >= 0 && priority64_v4 <= G_MAXUINT32)
global_opt.priority_v4 = (guint32) priority64_v4;
if (priority64_v6 >= 0 && priority64_v6 <= G_MAXUINT32)
global_opt.priority_v6 = (guint32) priority64_v6;
return TRUE;
}
static void
ip6_address_changed (NMPlatform *platform,
int obj_type_i,
int iface,
NMPlatformIP6Address *addr,
int change_type_i,
NMNDisc *ndisc)
{
const NMPlatformSignalChangeType change_type = change_type_i;
if ( (change_type == NM_PLATFORM_SIGNAL_CHANGED && addr->n_ifa_flags & IFA_F_DADFAILED)
|| (change_type == NM_PLATFORM_SIGNAL_REMOVED && addr->n_ifa_flags & IFA_F_TENTATIVE))
nm_ndisc_dad_failed (ndisc, &addr->address);
}
int
main (int argc, char *argv[])
{
char *bad_domains = NULL;
GError *error = NULL;
gboolean wrote_pidfile = FALSE;
gs_free char *pidfile = NULL;
gs_unref_object NMDhcpClient *dhcp4_client = NULL;
gs_unref_object NMNDisc *ndisc = NULL;
GByteArray *hwaddr = NULL;
size_t hwaddr_len = 0;
gconstpointer tmp;
gs_free NMUtilsIPv6IfaceId *iid = NULL;
guint sd_id;
nm_g_type_init ();
setpgid (getpid (), getpid ());
if (!do_early_setup (&argc, &argv))
return 1;
nm_logging_set_syslog_identifier ("nm-iface-helper");
nm_logging_set_prefix ("%s[%ld] (%s): ",
_NMLOG_PREFIX_NAME,
(long) getpid (),
global_opt.ifname ?: "???");
if (global_opt.g_fatal_warnings) {
GLogLevelFlags fatal_mask;
fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
g_log_set_always_fatal (fatal_mask);
}
if (global_opt.show_version) {
fprintf (stdout, NM_DIST_VERSION "\n");
return 0;
}
nm_main_utils_ensure_root ();
if (!global_opt.ifname || !global_opt.uuid) {
fprintf (stderr, _("An interface name and UUID are required\n"));
return 1;
}
gl.ifindex = nmp_utils_if_nametoindex (global_opt.ifname);
if (gl.ifindex <= 0) {
fprintf (stderr, _("Failed to find interface index for %s (%s)\n"), global_opt.ifname, strerror (errno));
return 1;
}
pidfile = g_strdup_printf (NMIH_PID_FILE_FMT, gl.ifindex);
nm_main_utils_ensure_not_running_pidfile (pidfile);
nm_main_utils_ensure_rundir ();
if (!nm_logging_setup (global_opt.opt_log_level,
global_opt.opt_log_domains,
&bad_domains,
&error)) {
fprintf (stderr,
_("%s. Please use --help to see a list of valid options.\n"),
error->message);
return 1;
} else if (bad_domains) {
fprintf (stderr,
_("Ignoring unrecognized log domain(s) '%s' passed on command line.\n"),
bad_domains);
g_clear_pointer (&bad_domains, g_free);
}
if (global_opt.become_daemon && !global_opt.debug) {
if (daemon (0, 0) < 0) {
int saved_errno;
saved_errno = errno;
fprintf (stderr, _("Could not daemonize: %s [error %u]\n"),
g_strerror (saved_errno),
saved_errno);
return 1;
}
if (nm_main_utils_write_pidfile (pidfile))
wrote_pidfile = TRUE;
}
/* Set up unix signal handling - before creating threads, but after daemonizing! */
gl.main_loop = g_main_loop_new (NULL, FALSE);
setup_signals ();
nm_logging_syslog_openlog (global_opt.logging_backend,
global_opt.debug);
_LOGI (LOGD_CORE, "nm-iface-helper (version " NM_DIST_VERSION ") is starting...");
/* Set up platform interaction layer */
nm_linux_platform_setup ();
tmp = nm_platform_link_get_address (NM_PLATFORM_GET, gl.ifindex, &hwaddr_len);
if (tmp) {
hwaddr = g_byte_array_sized_new (hwaddr_len);
g_byte_array_append (hwaddr, tmp, hwaddr_len);
}
if (global_opt.iid_str) {
GBytes *bytes;
gsize ignored = 0;
bytes = nm_utils_hexstr2bin (global_opt.iid_str);
if (!bytes || g_bytes_get_size (bytes) != sizeof (*iid)) {
fprintf (stderr, _("(%s): Invalid IID %s\n"), global_opt.ifname, global_opt.iid_str);
return 1;
}
iid = g_bytes_unref_to_data (bytes, &ignored);
}
if (global_opt.dhcp4_address) {
nm_platform_sysctl_set (NM_PLATFORM_GET, NMP_SYSCTL_PATHID_ABSOLUTE (nm_utils_ip4_property_path (global_opt.ifname, "promote_secondaries")), "1");
dhcp4_client = nm_dhcp_manager_start_ip4 (nm_dhcp_manager_get (),
nm_platform_get_multi_idx (NM_PLATFORM_GET),
global_opt.ifname,
gl.ifindex,
hwaddr,
global_opt.uuid,
global_opt.priority_v4,
!!global_opt.dhcp4_hostname,
global_opt.dhcp4_hostname,
global_opt.dhcp4_fqdn,
global_opt.dhcp4_clientid,
NM_DHCP_TIMEOUT_DEFAULT,
NULL,
global_opt.dhcp4_address);
g_assert (dhcp4_client);
g_signal_connect (dhcp4_client,
NM_DHCP_CLIENT_SIGNAL_STATE_CHANGED,
G_CALLBACK (dhcp4_state_changed),
NULL);
}
if (global_opt.slaac) {
NMUtilsStableType stable_type = NM_UTILS_STABLE_TYPE_UUID;
const char *stable_id = global_opt.uuid;
nm_platform_link_set_user_ipv6ll_enabled (NM_PLATFORM_GET, gl.ifindex, TRUE);
if ( global_opt.stable_id
&& (global_opt.stable_id[0] >= '0' && global_opt.stable_id[0] <= '9')
&& global_opt.stable_id[1] == ' ') {
/* strict parsing of --stable-id, which is the numeric stable-type
* and the ID, joined with one space. For now, only support stable-types
* from 0 to 9. */
stable_type = (global_opt.stable_id[0] - '0');
stable_id = &global_opt.stable_id[2];
}
ndisc = nm_lndp_ndisc_new (NM_PLATFORM_GET, gl.ifindex, global_opt.ifname,
stable_type, stable_id,
global_opt.addr_gen_mode,
NM_NDISC_NODE_TYPE_HOST,
NULL);
g_assert (ndisc);
if (iid)
nm_ndisc_set_iid (ndisc, *iid);
nm_platform_sysctl_set (NM_PLATFORM_GET, NMP_SYSCTL_PATHID_ABSOLUTE (nm_utils_ip6_property_path (global_opt.ifname, "accept_ra")), "1");
nm_platform_sysctl_set (NM_PLATFORM_GET, NMP_SYSCTL_PATHID_ABSOLUTE (nm_utils_ip6_property_path (global_opt.ifname, "accept_ra_defrtr")), "0");
nm_platform_sysctl_set (NM_PLATFORM_GET, NMP_SYSCTL_PATHID_ABSOLUTE (nm_utils_ip6_property_path (global_opt.ifname, "accept_ra_pinfo")), "0");
nm_platform_sysctl_set (NM_PLATFORM_GET, NMP_SYSCTL_PATHID_ABSOLUTE (nm_utils_ip6_property_path (global_opt.ifname, "accept_ra_rtr_pref")), "0");
g_signal_connect (NM_PLATFORM_GET,
NM_PLATFORM_SIGNAL_IP6_ADDRESS_CHANGED,
G_CALLBACK (ip6_address_changed),
ndisc);
g_signal_connect (ndisc,
NM_NDISC_CONFIG_RECEIVED,
G_CALLBACK (ndisc_config_changed),
NULL);
g_signal_connect (ndisc,
NM_NDISC_RA_TIMEOUT,
G_CALLBACK (ndisc_ra_timeout),
NULL);
nm_ndisc_start (ndisc);
}
sd_id = nm_sd_event_attach_default ();
g_main_loop_run (gl.main_loop);
g_clear_pointer (&hwaddr, g_byte_array_unref);
if (pidfile && wrote_pidfile)
unlink (pidfile);
_LOGI (LOGD_CORE, "exiting");
nm_clear_g_source (&sd_id);
g_clear_pointer (&gl.main_loop, g_main_loop_unref);
return 0;
}
/*****************************************************************************/
const NMDhcpClientFactory *const _nm_dhcp_manager_factories[3] = {
&_nm_dhcp_client_factory_internal,
};
/*****************************************************************************/
/* Stub functions */
#include "nm-config.h"
#include "devices/nm-device.h"
#include "nm-active-connection.h"
#include "nm-bus-manager.h"
void
nm_main_config_reload (int signal)
{
_LOGI (LOGD_CORE, "reloading configuration not supported");
}
NMConfig *
nm_config_get (void)
{
return GUINT_TO_POINTER (1);
}
NMConfigData *
nm_config_get_data_orig (NMConfig *config)
{
return GUINT_TO_POINTER (1);
}
char *
nm_config_data_get_value (const NMConfigData *config_data, const char *group, const char *key, NMConfigGetValueFlags flags)
{
return NULL;
}
gboolean
nm_config_get_configure_and_quit (NMConfig *config)
{
return TRUE;
}
NMBusManager *
nm_bus_manager_get (void)
{
return GUINT_TO_POINTER (1);
}
void
nm_bus_manager_register_object (NMBusManager *bus_manager,
GDBusObjectSkeleton *object)
{
}
void
nm_bus_manager_unregister_object (NMBusManager *bus_manager,
GDBusObjectSkeleton *object)
{
}
GType
nm_device_get_type (void)
{
g_return_val_if_reached (0);
}
GType
nm_active_connection_get_type (void)
{
g_return_val_if_reached (0);
}
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