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NetworkManager/src/nm-connectivity.c
Dan Williams 90692e3eff connectivity: disable HTTP keepalive for connectivity checks 
There won't be any further requests, so there's no point in keeping
the connection alive.  Even if the HTTP server doesn't care, proxy
servers in-between might keep the connection open for a couple seconds
for keepalive, and we might as well be nice to them and tell them we
don't need to keep it alive.
2015-03-16 10:45:25 -05:00

522 lines
15 KiB
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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) 2011 Thomas Bechtold <thomasbechtold@jpberlin.de>
* Copyright (C) 2011 Dan Williams <dcbw@redhat.com>
*/
#include "config.h"
#include <string.h>
#if WITH_CONCHECK
#include <libsoup/soup.h>
#endif
#include "nm-connectivity.h"
#include "nm-logging.h"
G_DEFINE_TYPE (NMConnectivity, nm_connectivity, G_TYPE_OBJECT)
#define NM_CONNECTIVITY_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), NM_TYPE_CONNECTIVITY, NMConnectivityPrivate))
#define DEFAULT_RESPONSE "NetworkManager is online" /* NOT LOCALIZED */
#define _LOG_DEFAULT_DOMAIN LOGD_CONCHECK
#define _LOG(level, domain, ...) \
G_STMT_START { \
nm_log ((level), (domain), \
"%s" _NM_UTILS_MACRO_FIRST(__VA_ARGS__), \
"connectivity: " \
_NM_UTILS_MACRO_REST(__VA_ARGS__)); \
} G_STMT_END
#define _LOGT(...) _LOG (LOGL_TRACE, _LOG_DEFAULT_DOMAIN, __VA_ARGS__)
#define _LOGD(...) _LOG (LOGL_DEBUG, _LOG_DEFAULT_DOMAIN, __VA_ARGS__)
#define _LOGI(...) _LOG (LOGL_INFO, _LOG_DEFAULT_DOMAIN, __VA_ARGS__)
#define _LOGW(...) _LOG (LOGL_WARN, _LOG_DEFAULT_DOMAIN, __VA_ARGS__)
#define _LOGE(...) _LOG (LOGL_ERR, _LOG_DEFAULT_DOMAIN, __VA_ARGS__)
typedef struct {
char *uri;
char *response;
guint interval;
gboolean online; /* whether periodic connectivity checking is enabled. */
#if WITH_CONCHECK
SoupSession *soup_session;
gboolean initial_check_obsoleted;
guint check_id;
#endif
NMConnectivityState state;
} NMConnectivityPrivate;
enum {
PROP_0,
PROP_URI,
PROP_INTERVAL,
PROP_RESPONSE,
PROP_STATE,
LAST_PROP
};
NMConnectivityState
nm_connectivity_get_state (NMConnectivity *connectivity)
{
g_return_val_if_fail (NM_IS_CONNECTIVITY (connectivity), NM_CONNECTIVITY_UNKNOWN);
return NM_CONNECTIVITY_GET_PRIVATE (connectivity)->state;
}
const char *
nm_connectivity_state_to_string (NMConnectivityState state)
{
switch (state) {
case NM_CONNECTIVITY_UNKNOWN:
return "UNKNOWN";
case NM_CONNECTIVITY_NONE:
return "NONE";
case NM_CONNECTIVITY_LIMITED:
return "LIMITED";
case NM_CONNECTIVITY_PORTAL:
return "PORTAL";
case NM_CONNECTIVITY_FULL:
return "FULL";
default:
g_return_val_if_reached ("???");
}
}
static void
update_state (NMConnectivity *self, NMConnectivityState state)
{
NMConnectivityPrivate *priv = NM_CONNECTIVITY_GET_PRIVATE (self);
if (priv->state != state) {
_LOGD ("state changed from %s to %s",
nm_connectivity_state_to_string (priv->state),
nm_connectivity_state_to_string (state));
priv->state = state;
g_object_notify (G_OBJECT (self), NM_CONNECTIVITY_STATE);
}
}
#if WITH_CONCHECK
typedef struct {
GSimpleAsyncResult *simple;
char *uri;
char *response;
guint check_id_when_scheduled;
} ConCheckCbData;
static void
nm_connectivity_check_cb (SoupSession *session, SoupMessage *msg, gpointer user_data)
{
NMConnectivity *self;
NMConnectivityPrivate *priv;
ConCheckCbData *cb_data = user_data;
GSimpleAsyncResult *simple = cb_data->simple;
NMConnectivityState new_state;
const char *nm_header;
const char *uri = cb_data->uri;
const char *response = cb_data->response ? cb_data->response : DEFAULT_RESPONSE;
self = NM_CONNECTIVITY (g_async_result_get_source_object (G_ASYNC_RESULT (simple)));
/* it is safe to unref @self here, @simple holds yet another reference. */
g_object_unref (self);
priv = NM_CONNECTIVITY_GET_PRIVATE (self);
if (SOUP_STATUS_IS_TRANSPORT_ERROR (msg->status_code)) {
_LOGI ("check for uri '%s' failed with '%s'", uri, msg->reason_phrase);
new_state = NM_CONNECTIVITY_LIMITED;
goto done;
}
/* Check headers; if we find the NM-specific one we're done */
nm_header = soup_message_headers_get_one (msg->response_headers, "X-NetworkManager-Status");
if (g_strcmp0 (nm_header, "online") == 0) {
_LOGD ("check for uri '%s' with Status header successful.", uri);
new_state = NM_CONNECTIVITY_FULL;
} else if (msg->status_code == SOUP_STATUS_OK) {
/* check response */
if (msg->response_body->data && g_str_has_prefix (msg->response_body->data, response)) {
_LOGD ("check for uri '%s' successful.", uri);
new_state = NM_CONNECTIVITY_FULL;
} else {
_LOGI ("check for uri '%s' did not match expected response '%s'; assuming captive portal.",
uri, response);
new_state = NM_CONNECTIVITY_PORTAL;
}
} else {
_LOGI ("check for uri '%s' returned status '%d %s'; assuming captive portal.",
uri, msg->status_code, msg->reason_phrase);
new_state = NM_CONNECTIVITY_PORTAL;
}
done:
/* Only update the state, if the call was done from external, or if the periodic check
* is still the one that called this async check. */
if (!cb_data->check_id_when_scheduled || cb_data->check_id_when_scheduled == priv->check_id) {
/* Only update the state, if the URI and response parameters did not change
* since invocation.
* The interval does not matter for exernal calls, and for internal calls
* we don't reach this line if the interval changed. */
if ( !g_strcmp0 (cb_data->uri, priv->uri)
&& !g_strcmp0 (cb_data->response, priv->response))
update_state (self, new_state);
}
g_simple_async_result_set_op_res_gssize (simple, new_state);
g_simple_async_result_complete (simple);
g_object_unref (simple);
g_free (cb_data->uri);
g_free (cb_data->response);
g_slice_free (ConCheckCbData, cb_data);
}
#define IS_PERIODIC_CHECK(callback) (callback == run_check_complete)
static void
run_check_complete (GObject *object,
GAsyncResult *result,
gpointer user_data)
{
NMConnectivity *self = NM_CONNECTIVITY (object);
GError *error = NULL;
nm_connectivity_check_finish (self, result, &error);
if (error) {
_LOGE ("check failed: %s", error->message);
g_error_free (error);
}
}
static gboolean
run_check (gpointer user_data)
{
NMConnectivity *self = NM_CONNECTIVITY (user_data);
nm_connectivity_check_async (self, run_check_complete, NULL);
return TRUE;
}
static gboolean
idle_start_periodic_checks (gpointer user_data)
{
NMConnectivity *self = user_data;
NMConnectivityPrivate *priv = NM_CONNECTIVITY_GET_PRIVATE (self);
priv->check_id = g_timeout_add_seconds (priv->interval, run_check, self);
if (!priv->initial_check_obsoleted)
run_check (self);
return FALSE;
}
#endif
static void
_reschedule_periodic_checks (NMConnectivity *self, gboolean force_reschedule)
{
NMConnectivityPrivate *priv = NM_CONNECTIVITY_GET_PRIVATE (self);
#if WITH_CONCHECK
if (priv->online && priv->uri && priv->interval) {
if (force_reschedule || !priv->check_id) {
if (priv->check_id)
g_source_remove (priv->check_id);
priv->check_id = g_timeout_add (0, idle_start_periodic_checks, self);
priv->initial_check_obsoleted = FALSE;
}
} else {
if (priv->check_id) {
g_source_remove (priv->check_id);
priv->check_id = 0;
}
}
if (priv->check_id)
return;
#endif
/* Either @online is %TRUE but we aren't checking connectivity, or
* @online is %FALSE. Either way we can update our status immediately.
*/
update_state (self, priv->online ? NM_CONNECTIVITY_FULL : NM_CONNECTIVITY_NONE);
}
void
nm_connectivity_set_online (NMConnectivity *self,
gboolean online)
{
NMConnectivityPrivate *priv= NM_CONNECTIVITY_GET_PRIVATE (self);
online = !!online;
if (priv->online != online) {
_LOGD ("set %s", online ? "online" : "offline");
priv->online = online;
_reschedule_periodic_checks (self, FALSE);
}
}
void
nm_connectivity_check_async (NMConnectivity *self,
GAsyncReadyCallback callback,
gpointer user_data)
{
NMConnectivityPrivate *priv;
GSimpleAsyncResult *simple;
g_return_if_fail (NM_IS_CONNECTIVITY (self));
priv = NM_CONNECTIVITY_GET_PRIVATE (self);
simple = g_simple_async_result_new (G_OBJECT (self), callback, user_data,
nm_connectivity_check_async);
#if WITH_CONCHECK
if (priv->uri && priv->interval) {
SoupMessage *msg;
ConCheckCbData *cb_data = g_slice_new (ConCheckCbData);
msg = soup_message_new ("GET", priv->uri);
soup_message_set_flags (msg, SOUP_MESSAGE_NO_REDIRECT);
/* Disable HTTP/1.1 keepalive; the connection should not persist */
soup_message_headers_append (msg->request_headers, "Connection", "close");
cb_data->simple = simple;
cb_data->uri = g_strdup (priv->uri);
cb_data->response = g_strdup (priv->response);
/* For internal calls (periodic), remember the check-id at time of scheduling. */
cb_data->check_id_when_scheduled = IS_PERIODIC_CHECK (callback) ? priv->check_id : 0;
soup_session_queue_message (priv->soup_session,
msg,
nm_connectivity_check_cb,
cb_data);
priv->initial_check_obsoleted = TRUE;
_LOGD ("check: send %srequest to '%s'", IS_PERIODIC_CHECK (callback) ? "periodic " : "", priv->uri);
return;
} else {
g_warn_if_fail (!IS_PERIODIC_CHECK (callback));
_LOGD ("check: faking request. Connectivity check disabled");
}
#else
_LOGD ("check: faking request. Compiled without connectivity-check support");
#endif
g_simple_async_result_set_op_res_gssize (simple, priv->state);
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
}
NMConnectivityState
nm_connectivity_check_finish (NMConnectivity *self,
GAsyncResult *result,
GError **error)
{
GSimpleAsyncResult *simple;
g_return_val_if_fail (g_simple_async_result_is_valid (result, G_OBJECT (self), nm_connectivity_check_async), NM_CONNECTIVITY_UNKNOWN);
simple = G_SIMPLE_ASYNC_RESULT (result);
if (g_simple_async_result_propagate_error (simple, error))
return NM_CONNECTIVITY_UNKNOWN;
return (NMConnectivityState) g_simple_async_result_get_op_res_gssize (simple);
}
/**************************************************************************/
NMConnectivity *
nm_connectivity_new (const char *uri,
guint interval,
const char *response)
{
return g_object_new (NM_TYPE_CONNECTIVITY,
NM_CONNECTIVITY_URI, uri,
NM_CONNECTIVITY_INTERVAL, interval,
NM_CONNECTIVITY_RESPONSE, response,
NULL);
}
static void
set_property (GObject *object, guint property_id,
const GValue *value, GParamSpec *pspec)
{
NMConnectivity *self = NM_CONNECTIVITY (object);
NMConnectivityPrivate *priv = NM_CONNECTIVITY_GET_PRIVATE (self);
const char *uri, *response;
guint interval;
switch (property_id) {
case PROP_URI:
uri = g_value_get_string (value);
if (uri && !*uri)
uri = NULL;
#if WITH_CONCHECK
if (uri) {
SoupURI *soup_uri = soup_uri_new (uri);
if (!soup_uri || !SOUP_URI_VALID_FOR_HTTP (soup_uri)) {
_LOGE ("invalid uri '%s' for connectivity check.", uri);
uri = NULL;
}
if (soup_uri)
soup_uri_free (soup_uri);
}
#endif
if (g_strcmp0 (uri, priv->uri) != 0) {
g_free (priv->uri);
priv->uri = g_strdup (uri);
_reschedule_periodic_checks (self, TRUE);
}
break;
case PROP_INTERVAL:
interval = g_value_get_uint (value);
if (priv->interval != interval) {
priv->interval = interval;
_reschedule_periodic_checks (self, TRUE);
}
break;
case PROP_RESPONSE:
response = g_value_get_string (value);
if (g_strcmp0 (response, priv->response) != 0) {
/* a response %NULL means, DEFAULT_RESPONSE. Any other response
* (including "") is accepted. */
g_free (priv->response);
priv->response = g_strdup (response);
_reschedule_periodic_checks (self, TRUE);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
get_property (GObject *object, guint property_id,
GValue *value, GParamSpec *pspec)
{
NMConnectivity *self = NM_CONNECTIVITY (object);
NMConnectivityPrivate *priv = NM_CONNECTIVITY_GET_PRIVATE (self);
switch (property_id) {
case PROP_URI:
g_value_set_string (value, priv->uri);
break;
case PROP_INTERVAL:
g_value_set_uint (value, priv->interval);
break;
case PROP_RESPONSE:
if (priv->response)
g_value_set_string (value, priv->response);
else
g_value_set_static_string (value, DEFAULT_RESPONSE);
break;
case PROP_STATE:
g_value_set_uint (value, priv->state);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
nm_connectivity_init (NMConnectivity *self)
{
NMConnectivityPrivate *priv = NM_CONNECTIVITY_GET_PRIVATE (self);
#if WITH_CONCHECK
priv->soup_session = soup_session_async_new_with_options (SOUP_SESSION_TIMEOUT, 15, NULL);
#endif
priv->state = NM_CONNECTIVITY_NONE;
}
static void
dispose (GObject *object)
{
NMConnectivity *self = NM_CONNECTIVITY (object);
NMConnectivityPrivate *priv = NM_CONNECTIVITY_GET_PRIVATE (self);
g_clear_pointer (&priv->uri, g_free);
g_clear_pointer (&priv->response, g_free);
#if WITH_CONCHECK
if (priv->soup_session) {
soup_session_abort (priv->soup_session);
g_clear_object (&priv->soup_session);
}
if (priv->check_id > 0) {
g_source_remove (priv->check_id);
priv->check_id = 0;
}
#endif
}
static void
nm_connectivity_class_init (NMConnectivityClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (NMConnectivityPrivate));
/* virtual methods */
object_class->set_property = set_property;
object_class->get_property = get_property;
object_class->dispose = dispose;
/* properties */
g_object_class_install_property
(object_class, PROP_URI,
g_param_spec_string (NM_CONNECTIVITY_URI, "", "",
NULL,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property
(object_class, PROP_INTERVAL,
g_param_spec_uint (NM_CONNECTIVITY_INTERVAL, "", "",
0, G_MAXUINT, 300,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property
(object_class, PROP_RESPONSE,
g_param_spec_string (NM_CONNECTIVITY_RESPONSE, "", "",
DEFAULT_RESPONSE,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property
(object_class, PROP_STATE,
g_param_spec_uint (NM_CONNECTIVITY_STATE, "", "",
NM_CONNECTIVITY_UNKNOWN, NM_CONNECTIVITY_FULL, NM_CONNECTIVITY_UNKNOWN,
G_PARAM_READABLE |
G_PARAM_STATIC_STRINGS));
}
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