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- /*
- This file is part of GNUnet.
- Copyright (C) 2014, 2016 GNUnet e.V.
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- or (at your option) any later version.
- GNUnet 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
- Affero General Public License for more details.
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @file transport/transport_api_monitor_plugins.c
- * @brief montoring api for transport plugin session status
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet_util_lib.h"
- #include "gnunet_arm_service.h"
- #include "gnunet_hello_lib.h"
- #include "gnunet_protocols.h"
- #include "gnunet_transport_service.h"
- #include "transport.h"
- /**
- * Handle for a plugin session state monitor.
- */
- struct GNUNET_TRANSPORT_PluginMonitor
- {
- /**
- * Connection to the service.
- */
- struct GNUNET_MQ_Handle *mq;
- /**
- * Our configuration.
- */
- const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Callback to call.
- */
- GNUNET_TRANSPORT_SessionMonitorCallback cb;
- /**
- * Closure for @e cb
- */
- void *cb_cls;
- /**
- * Map of session_ids (reduced to 32-bits) to
- * `struct GNUNET_TRANSPORT_PluginSession` objects.
- */
- struct GNUNET_CONTAINER_MultiHashMap32 *sessions;
- /**
- * Backoff for reconnect.
- */
- struct GNUNET_TIME_Relative backoff;
- /**
- * Task ID for reconnect.
- */
- struct GNUNET_SCHEDULER_Task *reconnect_task;
- };
- /**
- * Abstract representation of a plugin's session.
- * Corresponds to the `struct GNUNET_ATS_Session` within the TRANSPORT service.
- */
- struct GNUNET_TRANSPORT_PluginSession
- {
- /**
- * Unique session identifier.
- */
- uint64_t session_id;
- /**
- * Location for the client to store "data".
- */
- void *client_ctx;
- };
- /**
- * Task run to re-establish the connection.
- *
- * @param cls our `struct GNUNET_TRANSPORT_PluginMonitor *`
- */
- static void
- do_plugin_connect (void *cls);
- /**
- * Free the session entry and notify the callback about its demise.
- *
- * @param cls our `struct GNUNET_TRANSPORT_PluginMonitor`
- * @param key key of the session in the map
- * @param value the session to free
- * @return #GNUNET_OK (continue to iterate)
- */
- static int
- free_entry (void *cls,
- uint32_t key,
- void *value)
- {
- struct GNUNET_TRANSPORT_PluginMonitor *pm = cls;
- struct GNUNET_TRANSPORT_PluginSession *ps = value;
- pm->cb (pm->cb_cls,
- ps,
- &ps->client_ctx,
- NULL);
- GNUNET_break (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap32_remove (pm->sessions,
- key,
- ps));
- GNUNET_break (NULL == ps->client_ctx);
- GNUNET_free (ps);
- return GNUNET_OK;
- }
- /**
- * Cut the existing connection and reconnect.
- *
- * @param pm our context
- */
- static void
- reconnect_plugin_ctx (struct GNUNET_TRANSPORT_PluginMonitor *pm)
- {
- GNUNET_MQ_destroy (pm->mq);
- pm->mq = NULL;
- GNUNET_CONTAINER_multihashmap32_iterate (pm->sessions,
- &free_entry,
- pm);
- pm->backoff = GNUNET_TIME_STD_BACKOFF (pm->backoff);
- pm->reconnect_task = GNUNET_SCHEDULER_add_delayed (pm->backoff,
- &do_plugin_connect,
- pm);
- }
- /**
- * Convert 64-bit session ID to 32-bit index for hash map.
- *
- * @param id 64-bit session ID
- * @return 32-bit hash map index
- */
- static uint32_t
- wrap_id (uint64_t id)
- {
- return ((uint32_t) id) ^ ((uint32_t) (id >> 32));
- }
- /**
- * Context for #locate_by_id().
- */
- struct SearchContext
- {
- /**
- * Result.
- */
- struct GNUNET_TRANSPORT_PluginSession *ps;
- /**
- * ID to locate.
- */
- uint64_t session_id;
- };
- /**
- * Locate a session entry.
- *
- * @param cls our `struct SearchContext`
- * @param key key of the session in the map
- * @param value a session
- * @return #GNUNET_OK (continue to iterate), or #GNUNET_SYSERR (match found)
- */
- static int
- locate_by_id (void *cls,
- uint32_t key,
- void *value)
- {
- struct SearchContext *sc = cls;
- struct GNUNET_TRANSPORT_PluginSession *ps = value;
- if (sc->session_id == ps->session_id)
- {
- sc->ps = ps;
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
- }
- /**
- * Function called with responses from the service.
- *
- * @param cls our `struct GNUNET_TRANSPORT_PluginMonitor *`
- * @paramm tpmm message with event data
- * @return #GNUNET_Ok if message is well-formed
- */
- static int
- check_event (void *cls,
- const struct TransportPluginMonitorMessage *tpmm)
- {
- const char *pname;
- size_t pname_len;
- size_t paddr_len;
- pname = (const char *) &tpmm[1];
- pname_len = ntohs (tpmm->plugin_name_len);
- paddr_len = ntohs (tpmm->plugin_address_len);
- if ((pname_len
- + paddr_len
- + sizeof(struct TransportPluginMonitorMessage) != ntohs (
- tpmm->header.size)) ||
- ((0 != pname_len) &&
- ('\0' != pname[pname_len - 1])))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
- }
- /**
- * Function called with responses from the service.
- *
- * @param cls our `struct GNUNET_TRANSPORT_PluginMonitor *`
- * @paramm tpmm message with event data
- */
- static void
- handle_event (void *cls,
- const struct TransportPluginMonitorMessage *tpmm)
- {
- struct GNUNET_TRANSPORT_PluginMonitor *pm = cls;
- struct GNUNET_TRANSPORT_PluginSession *ps;
- const char *pname;
- const void *paddr;
- enum GNUNET_TRANSPORT_SessionState ss;
- size_t pname_len;
- size_t paddr_len;
- struct GNUNET_TRANSPORT_SessionInfo info;
- struct GNUNET_HELLO_Address addr;
- struct SearchContext rv;
- pname = (const char *) &tpmm[1];
- pname_len = ntohs (tpmm->plugin_name_len);
- paddr_len = ntohs (tpmm->plugin_address_len);
- paddr = &pname[pname_len];
- ps = NULL;
- ss = (enum GNUNET_TRANSPORT_SessionState) ntohs (tpmm->session_state);
- if (GNUNET_TRANSPORT_SS_INIT == ss)
- {
- ps = GNUNET_new (struct GNUNET_TRANSPORT_PluginSession);
- ps->session_id = tpmm->session_id;
- (void) GNUNET_CONTAINER_multihashmap32_put (pm->sessions,
- wrap_id (tpmm->session_id),
- ps,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
- }
- else
- {
- rv.session_id = tpmm->session_id;
- rv.ps = NULL;
- (void) GNUNET_CONTAINER_multihashmap32_get_multiple (pm->sessions,
- wrap_id (
- tpmm->session_id),
- &locate_by_id,
- &rv);
- ps = rv.ps;
- if (NULL == ps)
- {
- GNUNET_break (0);
- reconnect_plugin_ctx (pm);
- return;
- }
- }
- info.state = ss;
- info.is_inbound = (int16_t) ntohs (tpmm->is_inbound);
- info.num_msg_pending = ntohl (tpmm->msgs_pending);
- info.num_bytes_pending = ntohl (tpmm->bytes_pending);
- info.receive_delay = GNUNET_TIME_absolute_ntoh (tpmm->delay);
- info.session_timeout = GNUNET_TIME_absolute_ntoh (tpmm->timeout);
- info.address = &addr;
- addr.peer = tpmm->peer;
- addr.address = (0 == paddr_len) ? NULL : paddr;
- addr.address_length = paddr_len;
- addr.transport_name = (0 == pname_len) ? NULL : pname;
- addr.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
- pm->cb (pm->cb_cls,
- ps,
- &ps->client_ctx,
- &info);
- if (GNUNET_TRANSPORT_SS_DONE == ss)
- {
- GNUNET_break (NULL == ps->client_ctx);
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap32_remove (pm->sessions,
- wrap_id (
- tpmm->session_id),
- ps));
- GNUNET_free (ps);
- }
- }
- /**
- * Function called with sync responses from the service.
- *
- * @param cls our `struct GNUNET_TRANSPORT_PluginMonitor *`
- * @param msg message from the service
- */
- static void
- handle_sync (void *cls,
- const struct GNUNET_MessageHeader *msg)
- {
- struct GNUNET_TRANSPORT_PluginMonitor *pm = cls;
- /* we are in sync, notify callback */
- pm->cb (pm->cb_cls,
- NULL,
- NULL,
- NULL);
- }
- /**
- * Generic error handler, called with the appropriate
- * error code and the same closure specified at the creation of
- * the message queue.
- * Not every message queue implementation supports an error handler.
- *
- * @param cls closure with the `struct GNUNET_NSE_Handle *`
- * @param error error code
- */
- static void
- mq_error_handler (void *cls,
- enum GNUNET_MQ_Error error)
- {
- struct GNUNET_TRANSPORT_PluginMonitor *pm = cls;
- reconnect_plugin_ctx (pm);
- }
- /**
- * Task run to re-establish the connection.
- *
- * @param cls our `struct GNUNET_TRANSPORT_PluginMonitor *`
- */
- static void
- do_plugin_connect (void *cls)
- {
- struct GNUNET_TRANSPORT_PluginMonitor *pm = cls;
- struct GNUNET_MQ_MessageHandler handlers[] = {
- GNUNET_MQ_hd_var_size (event,
- GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PLUGIN_EVENT,
- struct TransportPluginMonitorMessage,
- pm),
- GNUNET_MQ_hd_fixed_size (sync,
- GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PLUGIN_SYNC,
- struct GNUNET_MessageHeader,
- pm),
- GNUNET_MQ_handler_end ()
- };
- struct GNUNET_MessageHeader *msg;
- struct GNUNET_MQ_Envelope *env;
- pm->reconnect_task = NULL;
- pm->mq = GNUNET_CLIENT_connect (pm->cfg,
- "transport",
- handlers,
- &mq_error_handler,
- pm);
- if (NULL == pm->mq)
- return;
- env = GNUNET_MQ_msg (msg,
- GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PLUGIN_START);
- GNUNET_MQ_send (pm->mq,
- env);
- }
- /**
- * Install a plugin session state monitor callback. The callback
- * will be notified whenever the session changes.
- *
- * @param cfg configuration to use
- * @param cb callback to invoke on events
- * @param cb_cls closure for @a cb
- * @return NULL on error, otherwise handle for cancellation
- */
- struct GNUNET_TRANSPORT_PluginMonitor *
- GNUNET_TRANSPORT_monitor_plugins (const struct GNUNET_CONFIGURATION_Handle *cfg,
- GNUNET_TRANSPORT_SessionMonitorCallback cb,
- void *cb_cls)
- {
- struct GNUNET_TRANSPORT_PluginMonitor *pm;
- pm = GNUNET_new (struct GNUNET_TRANSPORT_PluginMonitor);
- pm->cb = cb;
- pm->cb_cls = cb_cls;
- pm->cfg = cfg;
- do_plugin_connect (pm);
- if (NULL == pm->mq)
- {
- GNUNET_free (pm);
- return NULL;
- }
- pm->sessions = GNUNET_CONTAINER_multihashmap32_create (128);
- return pm;
- }
- /**
- * Cancel monitoring the plugin session state. The callback will
- * be called once for each session that is up with the information
- * #GNUNET_TRANSPORT_SS_FINI (even though the session may stay up;
- * this is just to enable client-side cleanup).
- *
- * @param pm handle of the request that is to be cancelled
- */
- void
- GNUNET_TRANSPORT_monitor_plugins_cancel (struct
- GNUNET_TRANSPORT_PluginMonitor *pm)
- {
- if (NULL != pm->mq)
- {
- GNUNET_MQ_destroy (pm->mq);
- pm->mq = NULL;
- }
- if (NULL != pm->reconnect_task)
- {
- GNUNET_SCHEDULER_cancel (pm->reconnect_task);
- pm->reconnect_task = NULL;
- }
- GNUNET_CONTAINER_multihashmap32_iterate (pm->sessions,
- &free_entry,
- pm);
- GNUNET_CONTAINER_multihashmap32_destroy (pm->sessions);
- GNUNET_free (pm);
- }
- /* end of transport_api_monitor_plugins.c */
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