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- /*
- This file is part of GNUnet.
- Copyright (C) 2012, 2013, 2014, 2017, 2018 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 zonemaster/gnunet-service-zonemaster-monitor.c
- * @brief monitor namestore changes and publish them immediately to GNUnet name system
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet_util_lib.h"
- #include "gnunet_dht_service.h"
- #include "gnunet_namestore_service.h"
- #include "gnunet_statistics_service.h"
- #define LOG_STRERROR_FILE(kind,syscall,filename) GNUNET_log_from_strerror_file (kind, "util", syscall, filename)
- /**
- * How often should we (re)publish each record before
- * it expires?
- */
- #define PUBLISH_OPS_PER_EXPIRATION 4
- /**
- * How many pending DHT operations do we allow at most?
- */
- #define DHT_QUEUE_LIMIT 2000
- /**
- * How many events may the namestore give us before it has to wait
- * for us to keep up?
- */
- #define NAMESTORE_QUEUE_LIMIT 5
- /**
- * What replication level do we use for DHT PUT operations?
- */
- #define DHT_GNS_REPLICATION_LEVEL 5
- /**
- * Handle for DHT PUT activity triggered from the namestore monitor.
- */
- struct DhtPutActivity
- {
- /**
- * Kept in a DLL.
- */
- struct DhtPutActivity *next;
- /**
- * Kept in a DLL.
- */
- struct DhtPutActivity *prev;
- /**
- * Handle for the DHT PUT operation.
- */
- struct GNUNET_DHT_PutHandle *ph;
- /**
- * When was this PUT initiated?
- */
- struct GNUNET_TIME_Absolute start_date;
- };
- /**
- * Handle to the statistics service
- */
- static struct GNUNET_STATISTICS_Handle *statistics;
- /**
- * Our handle to the DHT
- */
- static struct GNUNET_DHT_Handle *dht_handle;
- /**
- * Our handle to the namestore service
- */
- static struct GNUNET_NAMESTORE_Handle *namestore_handle;
- /**
- * Handle to monitor namestore changes to instant propagation.
- */
- static struct GNUNET_NAMESTORE_ZoneMonitor *zmon;
- /**
- * Head of monitor activities; kept in a DLL.
- */
- static struct DhtPutActivity *ma_head;
- /**
- * Tail of monitor activities; kept in a DLL.
- */
- static struct DhtPutActivity *ma_tail;
- /**
- * Number of entries in the DHT queue #ma_head.
- */
- static unsigned int ma_queue_length;
- /**
- * Optimize block insertion by caching map of private keys to
- * public keys in memory?
- */
- static int cache_keys;
- /**
- * Task run during shutdown.
- *
- * @param cls unused
- * @param tc unused
- */
- static void
- shutdown_task (void *cls)
- {
- struct DhtPutActivity *ma;
- (void) cls;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Shutting down!\n");
- while (NULL != (ma = ma_head))
- {
- GNUNET_DHT_put_cancel (ma->ph);
- ma_queue_length--;
- GNUNET_CONTAINER_DLL_remove (ma_head,
- ma_tail,
- ma);
- GNUNET_free (ma);
- }
- if (NULL != statistics)
- {
- GNUNET_STATISTICS_destroy (statistics,
- GNUNET_NO);
- statistics = NULL;
- }
- if (NULL != zmon)
- {
- GNUNET_NAMESTORE_zone_monitor_stop (zmon);
- zmon = NULL;
- }
- if (NULL != namestore_handle)
- {
- GNUNET_NAMESTORE_disconnect (namestore_handle);
- namestore_handle = NULL;
- }
- if (NULL != dht_handle)
- {
- GNUNET_DHT_disconnect (dht_handle);
- dht_handle = NULL;
- }
- }
- /**
- * Continuation called from DHT once the PUT operation triggered
- * by a monitor is done.
- *
- * @param cls a `struct DhtPutActivity`
- */
- static void
- dht_put_monitor_continuation (void *cls)
- {
- struct DhtPutActivity *ma = cls;
- GNUNET_NAMESTORE_zone_monitor_next (zmon,
- 1);
- ma_queue_length--;
- GNUNET_CONTAINER_DLL_remove (ma_head,
- ma_tail,
- ma);
- GNUNET_free (ma);
- }
- /**
- * Convert namestore records from the internal format to that
- * suitable for publication (removes private records, converts
- * to absolute expiration time).
- *
- * @param rd input records
- * @param rd_count size of the @a rd and @a rd_public arrays
- * @param rd_public where to write the converted records
- * @return number of records written to @a rd_public
- */
- static unsigned int
- convert_records_for_export (const struct GNUNET_GNSRECORD_Data *rd,
- unsigned int rd_count,
- struct GNUNET_GNSRECORD_Data *rd_public)
- {
- struct GNUNET_TIME_Absolute now;
- unsigned int rd_public_count;
- rd_public_count = 0;
- now = GNUNET_TIME_absolute_get ();
- for (unsigned int i=0;i<rd_count;i++)
- {
- if (0 != (rd[i].flags & GNUNET_GNSRECORD_RF_PRIVATE))
- continue;
- if ( (0 == (rd[i].flags & GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION)) &&
- (rd[i].expiration_time < now.abs_value_us) )
- continue; /* record already expired, skip it */
- rd_public[rd_public_count++] = rd[i];
- }
- return rd_public_count;
- }
- /**
- * Store GNS records in the DHT.
- *
- * @param key key of the zone
- * @param label label to store under
- * @param rd_public public record data
- * @param rd_public_count number of records in @a rd_public
- * @param ma handle for the PUT operation
- * @return DHT PUT handle, NULL on error
- */
- static struct GNUNET_DHT_PutHandle *
- perform_dht_put (const struct GNUNET_CRYPTO_EcdsaPrivateKey *key,
- const char *label,
- const struct GNUNET_GNSRECORD_Data *rd_public,
- unsigned int rd_public_count,
- struct DhtPutActivity *ma)
- {
- struct GNUNET_GNSRECORD_Block *block;
- struct GNUNET_HashCode query;
- struct GNUNET_TIME_Absolute expire;
- size_t block_size;
- struct GNUNET_DHT_PutHandle *ret;
- expire = GNUNET_GNSRECORD_record_get_expiration_time (rd_public_count,
- rd_public);
- if (cache_keys)
- block = GNUNET_GNSRECORD_block_create2 (key,
- expire,
- label,
- rd_public,
- rd_public_count);
- else
- block = GNUNET_GNSRECORD_block_create (key,
- expire,
- label,
- rd_public,
- rd_public_count);
- if (NULL == block)
- {
- GNUNET_break (0);
- return NULL; /* whoops */
- }
- block_size = ntohl (block->purpose.size)
- + sizeof (struct GNUNET_CRYPTO_EcdsaSignature)
- + sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey);
- GNUNET_GNSRECORD_query_from_private_key (key,
- label,
- &query);
- GNUNET_STATISTICS_update (statistics,
- "DHT put operations initiated",
- 1,
- GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Storing %u record(s) for label `%s' in DHT with expiration `%s' under key %s\n",
- rd_public_count,
- label,
- GNUNET_STRINGS_absolute_time_to_string (expire),
- GNUNET_h2s (&query));
- ret = GNUNET_DHT_put (dht_handle,
- &query,
- DHT_GNS_REPLICATION_LEVEL,
- GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
- GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
- block_size,
- block,
- expire,
- &dht_put_monitor_continuation,
- ma);
- GNUNET_free (block);
- return ret;
- }
- /**
- * Process a record that was stored in the namestore
- * (invoked by the monitor).
- *
- * @param cls closure, NULL
- * @param zone private key of the zone; NULL on disconnect
- * @param label label of the records; NULL on disconnect
- * @param rd_count number of entries in @a rd array, 0 if label was deleted
- * @param rd array of records with data to store
- */
- static void
- handle_monitor_event (void *cls,
- const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
- const char *label,
- unsigned int rd_count,
- const struct GNUNET_GNSRECORD_Data *rd)
- {
- struct GNUNET_GNSRECORD_Data rd_public[rd_count];
- unsigned int rd_public_count;
- struct DhtPutActivity *ma;
- (void) cls;
- GNUNET_STATISTICS_update (statistics,
- "Namestore monitor events received",
- 1,
- GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received %u records for label `%s' via namestore monitor\n",
- rd_count,
- label);
- /* filter out records that are not public, and convert to
- absolute expiration time. */
- rd_public_count = convert_records_for_export (rd,
- rd_count,
- rd_public);
- if (0 == rd_public_count)
- {
- GNUNET_NAMESTORE_zone_monitor_next (zmon,
- 1);
- return; /* nothing to do */
- }
- ma = GNUNET_new (struct DhtPutActivity);
- ma->start_date = GNUNET_TIME_absolute_get ();
- ma->ph = perform_dht_put (zone,
- label,
- rd,
- rd_count,
- ma);
- if (NULL == ma->ph)
- {
- /* PUT failed, do not remember operation */
- GNUNET_free (ma);
- GNUNET_NAMESTORE_zone_monitor_next (zmon,
- 1);
- return;
- }
- GNUNET_CONTAINER_DLL_insert_tail (ma_head,
- ma_tail,
- ma);
- ma_queue_length++;
- if (ma_queue_length > DHT_QUEUE_LIMIT)
- {
- ma = ma_head;
- GNUNET_CONTAINER_DLL_remove (ma_head,
- ma_tail,
- ma);
- GNUNET_DHT_put_cancel (ma->ph);
- ma_queue_length--;
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "DHT PUT unconfirmed after %s, aborting PUT\n",
- GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_duration (ma->start_date),
- GNUNET_YES));
- GNUNET_free (ma);
- }
- }
- /**
- * The zone monitor encountered an IPC error trying to to get in
- * sync. Restart from the beginning.
- *
- * @param cls NULL
- */
- static void
- handle_monitor_error (void *cls)
- {
- (void) cls;
- GNUNET_STATISTICS_update (statistics,
- "Namestore monitor errors encountered",
- 1,
- GNUNET_NO);
- }
- /**
- * Performe zonemaster duties: watch namestore, publish records.
- *
- * @param cls closure
- * @param server the initialized server
- * @param c configuration to use
- */
- static void
- run (void *cls,
- const struct GNUNET_CONFIGURATION_Handle *c,
- struct GNUNET_SERVICE_Handle *service)
- {
- unsigned long long max_parallel_bg_queries = 128;
- (void) cls;
- (void) service;
- namestore_handle = GNUNET_NAMESTORE_connect (c);
- if (NULL == namestore_handle)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Failed to connect to the namestore!\n"));
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
- cache_keys = GNUNET_CONFIGURATION_get_value_yesno (c,
- "namestore",
- "CACHE_KEYS");
- if (GNUNET_OK ==
- GNUNET_CONFIGURATION_get_value_number (c,
- "zonemaster",
- "MAX_PARALLEL_BACKGROUND_QUERIES",
- &max_parallel_bg_queries))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Number of allowed parallel background queries: %llu\n",
- max_parallel_bg_queries);
- }
- if (0 == max_parallel_bg_queries)
- max_parallel_bg_queries = 1;
- dht_handle = GNUNET_DHT_connect (c,
- (unsigned int) max_parallel_bg_queries);
- if (NULL == dht_handle)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Could not connect to DHT!\n"));
- GNUNET_SCHEDULER_add_now (&shutdown_task,
- NULL);
- return;
- }
- /* Schedule periodic put for our records. */
- statistics = GNUNET_STATISTICS_create ("zonemaster-mon",
- c);
- zmon = GNUNET_NAMESTORE_zone_monitor_start (c,
- NULL,
- GNUNET_NO,
- &handle_monitor_error,
- NULL,
- &handle_monitor_event,
- NULL,
- NULL /* sync_cb */,
- NULL);
- GNUNET_NAMESTORE_zone_monitor_next (zmon,
- NAMESTORE_QUEUE_LIMIT - 1);
- GNUNET_break (NULL != zmon);
- GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
- NULL);
- }
- /**
- * Define "main" method using service macro.
- */
- GNUNET_SERVICE_MAIN
- ("zonemaster-monitor",
- GNUNET_SERVICE_OPTION_NONE,
- &run,
- NULL,
- NULL,
- NULL,
- GNUNET_MQ_handler_end());
- /* end of gnunet-service-zonemaster-monitor.c */
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