gnunet-service-namestore.c File Reference

namestore for the GNUnet naming system More...

#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_gns_service.h"
#include "gnunet_namestore_service.h"
#include "gnunet_namestore_plugin.h"
#include "gnunet_statistics_service.h"
#include "gnunet_signatures.h"
#include "namestore.h"

Include dependency graph for gnunet-service-namestore.c:

Go to the source code of this file.

Data Structures
struct	ZoneIteration
	A namestore iteration operation. More...
struct	NamestoreClient
	A namestore client. More...
struct	ZoneMonitor
	A namestore monitor. More...
struct	StoreActivity
	Information for an ongoing handle_record_store() operation. More...
struct	NickCache
	Entry in list of cached nick resolutions. More...
struct	RecordLookupContext
	Closure for lookup_it(). More...
struct	LookupExistingRecordsContext
struct	ZoneToNameCtx
	Context for record remove operations passed from handle_zone_to_name to handle_zone_to_name_it as closure. More...
struct	ZoneIterationProcResult
	Context for record remove operations passed from run_zone_iteration_round to zone_iterate_proc as closure. More...

Macros
#define	LOG_STRERROR_FILE(kind, syscall, filename)    GNUNET_log_from_strerror_file (kind, "util", syscall, filename)
#define	MONITOR_STALL_WARN_DELAY   GNUNET_TIME_UNIT_MINUTES
	If a monitor takes more than 1 minute to process an event, print a warning. More...
#define	NC_SIZE   16
	Size of the cache used by get_nick_record() More...

Functions
static void	cleanup_task (void *cls)
	Task run during shutdown. More...
static void	free_store_activity (struct StoreActivity *sa)
	Release memory used by sa. More...
static void	lookup_nick_it (void *cls, uint64_t seq, const struct GNUNET_IDENTITY_PrivateKey *private_key, const char *label, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
	Function called with the records for the GNUNET_GNS_EMPTY_LABEL_AT label in the zone. More...
static void	cache_nick (const struct GNUNET_IDENTITY_PrivateKey *zone, const struct GNUNET_GNSRECORD_Data *nick)
	Add entry to the cache for zone and nick. More...
static struct GNUNET_GNSRECORD_Data *	get_nick_record (const struct GNUNET_IDENTITY_PrivateKey *zone)
	Return the NICK record for the zone (if it exists). More...
static void	merge_with_nick_records (const struct GNUNET_GNSRECORD_Data *nick_rd, unsigned int rd2_length, const struct GNUNET_GNSRECORD_Data *rd2, unsigned int *rdc_res, struct GNUNET_GNSRECORD_Data **rd_res)
	Merge the nick record nick_rd with the rest of the record set given in rd2. More...
static int	send_lookup_response_with_filter (struct NamestoreClient *nc, uint32_t request_id, const struct GNUNET_IDENTITY_PrivateKey *zone_key, const char *name, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd, enum GNUNET_GNSRECORD_Filter filter)
	Generate a struct LookupNameResponseMessage and send it to the given client using the given notification context. More...
static void	send_store_response (struct NamestoreClient *nc, enum GNUNET_ErrorCode ec, uint32_t rid)
	Send response to the store request to the client. More...
static void	zone_iteration_done_client_continue (struct ZoneIteration *zi)
	Function called once we are done with the zone iteration and allow the zone iteration client to send us more messages. More...
static void	warn_monitor_slow (void *cls)
	Print a warning that one of our monitors is no longer reacting. More...
static int	continue_store_activity (struct StoreActivity *sa, int call_continue)
	Continue processing the sa. More...
static void	client_disconnect_cb (void *cls, struct GNUNET_SERVICE_Client *client, void *app_ctx)
	Called whenever a client is disconnected. More...
static void *	client_connect_cb (void *cls, struct GNUNET_SERVICE_Client *client, struct GNUNET_MQ_Handle *mq)
	Add a client to our list of active clients. More...
static void	lookup_it (void *cls, uint64_t seq, const struct GNUNET_IDENTITY_PrivateKey *private_key, const char *label, unsigned int rd_count_nf, const struct GNUNET_GNSRECORD_Data *rd_nf)
	Function called by the namestore plugin when we are trying to lookup a record as part of handle_record_lookup(). More...
static int	check_record_lookup (void *cls, const struct LabelLookupMessage *ll_msg)
	Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_LOOKUP message. More...
static void	handle_record_lookup (void *cls, const struct LabelLookupMessage *ll_msg)
	Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_LOOKUP message. More...
static int	check_record_store (void *cls, const struct RecordStoreMessage *rp_msg)
	Checks a GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE message. More...
static void	get_existing_rd_exp (void *cls, uint64_t seq, const struct GNUNET_IDENTITY_PrivateKey *private_key, const char *label, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
	Check if set contains a tombstone, store if necessary. More...
static enum GNUNET_ErrorCode	store_record_set (struct NamestoreClient *nc, const struct GNUNET_IDENTITY_PrivateKey *private_key, const struct RecordSet *rd_set, ssize_t *len)
static void	handle_record_store (void *cls, const struct RecordStoreMessage *rp_msg)
	Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE message. More...
static void	send_tx_response (int rid, enum GNUNET_ErrorCode ec, struct NamestoreClient *nc)
static void	handle_tx_control (void *cls, const struct TxControlMessage *tx_msg)
	Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_TX_CONTROL message. More...
static void	handle_zone_to_name_it (void *cls, uint64_t seq, const struct GNUNET_IDENTITY_PrivateKey *zone_key, const char *name, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
	Zone to name iterator. More...
static enum GNUNET_GenericReturnValue	check_zone_to_name (void *cls, const struct ZoneToNameMessage *zis_msg)
static void	handle_zone_to_name (void *cls, const struct ZoneToNameMessage *ztn_msg)
	Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME message. More...
static void	zone_iterate_proc (void *cls, uint64_t seq, const struct GNUNET_IDENTITY_PrivateKey *zone_key, const char *name, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
	Process results for zone iteration from database. More...
static void	run_zone_iteration_round (struct ZoneIteration *zi, uint64_t limit)
	Perform the next round of the zone iteration. More...
static enum GNUNET_GenericReturnValue	check_iteration_start (void *cls, const struct ZoneIterationStartMessage *zis_msg)
static void	handle_iteration_start (void *cls, const struct ZoneIterationStartMessage *zis_msg)
	Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_START message. More...
static void	handle_iteration_stop (void *cls, const struct ZoneIterationStopMessage *zis_msg)
	Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_STOP message. More...
static void	handle_iteration_next (void *cls, const struct ZoneIterationNextMessage *zis_msg)
	Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_NEXT message. More...
static void	monitor_unblock (struct ZoneMonitor *zm)
	Function called when the monitor is ready for more data, and we should thus unblock PUT operations that were blocked on the monitor not being ready. More...
static void	monitor_sync (struct ZoneMonitor *zm)
	Send 'sync' message to zone monitor, we're now in sync. More...
static void	monitor_iteration_next (void *cls)
	Obtain the next datum during the zone monitor's zone initial iteration. More...
static void	monitor_iterate_cb (void *cls, uint64_t seq, const struct GNUNET_IDENTITY_PrivateKey *zone_key, const char *name, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
	A GNUNET_NAMESTORE_RecordIterator for monitors. More...
static enum GNUNET_GenericReturnValue	check_monitor_start (void *cls, const struct ZoneMonitorStartMessage *zis_msg)
static void	handle_monitor_start (void *cls, const struct ZoneMonitorStartMessage *zis_msg)
	Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_START message. More...
static void	handle_monitor_next (void *cls, const struct ZoneMonitorNextMessage *nm)
	Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_NEXT message. More...
static void	run (void *cls, const struct GNUNET_CONFIGURATION_Handle *cfg, struct GNUNET_SERVICE_Handle *service)
	Process namestore requests. More...
	GNUNET_SERVICE_MAIN ("namestore", GNUNET_SERVICE_OPTION_NONE, &run, &client_connect_cb, &client_disconnect_cb, NULL, GNUNET_MQ_hd_fixed_size(tx_control, GNUNET_MESSAGE_TYPE_NAMESTORE_TX_CONTROL, struct TxControlMessage, NULL), GNUNET_MQ_hd_var_size(record_store, GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE, struct RecordStoreMessage, NULL), GNUNET_MQ_hd_var_size(record_lookup, GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_LOOKUP, struct LabelLookupMessage, NULL), GNUNET_MQ_hd_var_size(zone_to_name, GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME, struct ZoneToNameMessage, NULL), GNUNET_MQ_hd_var_size(iteration_start, GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_START, struct ZoneIterationStartMessage, NULL), GNUNET_MQ_hd_fixed_size(iteration_next, GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_NEXT, struct ZoneIterationNextMessage, NULL), GNUNET_MQ_hd_fixed_size(iteration_stop, GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_STOP, struct ZoneIterationStopMessage, NULL), GNUNET_MQ_hd_var_size(monitor_start, GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_START, struct ZoneMonitorStartMessage, NULL), GNUNET_MQ_hd_fixed_size(monitor_next, GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_NEXT, struct ZoneMonitorNextMessage, NULL), GNUNET_MQ_handler_end())
	Define "main" method using service macro. More...

Variables
static struct NickCache	nick_cache [16]
	We cache nick records to reduce DB load. More...
static const struct GNUNET_IDENTITY_PrivateKey	zero
	Public key of all zeros. More...
static const struct GNUNET_CONFIGURATION_Handle *	GSN_cfg
	Configuration handle. More...
static struct GNUNET_STATISTICS_Handle *	statistics
	Handle to the statistics service. More...
static char *	db_lib_name
	Name of the database plugin. More...
struct GNUNET_NAMESTORE_PluginFunctions *	GSN_database
	Database handle for service. More...
static struct ZoneMonitor *	monitor_head
	First active zone monitor. More...
static struct ZoneMonitor *	monitor_tail
	Last active zone monitor. More...
static struct StoreActivity *	sa_head
	Head of DLL of monitor-blocked store activities. More...
static struct StoreActivity *	sa_tail
	Tail of DLL of monitor-blocked store activities. More...
static struct GNUNET_NotificationContext *	monitor_nc
	Notification context shared by all monitors. More...
static int	return_orphaned
	Returned orphaned records? More...

Detailed Description

namestore for the GNUnet naming system

Author

Matthias Wachs

Christian Grothoff

Definition in file gnunet-service-namestore.c.

Macro Definition Documentation

LOG_STRERROR_FILE

#define LOG_STRERROR_FILE	(		kind,
			syscall,
			filename
	)		GNUNET_log_from_strerror_file (kind, "util", syscall, filename)

Definition at line 36 of file gnunet-service-namestore.c.

MONITOR_STALL_WARN_DELAY

#define MONITOR_STALL_WARN_DELAY   GNUNET_TIME_UNIT_MINUTES

If a monitor takes more than 1 minute to process an event, print a warning.

Definition at line 42 of file gnunet-service-namestore.c.

NC_SIZE

#define NC_SIZE   16

Size of the cache used by get_nick_record()

Definition at line 47 of file gnunet-service-namestore.c.

Function Documentation

cleanup_task()

static void cleanup_task ( void *  cls )

static

Task run during shutdown.

Parameters

cls

unused

Definition at line 409 of file gnunet-service-namestore.c.

{
  (void) cls;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Stopping namestore service\n");
  if (NULL != monitor_nc)
  {
    GNUNET_notification_context_destroy (monitor_nc);
    monitor_nc = NULL;
  }
  if (NULL != statistics)
  {
    GNUNET_STATISTICS_destroy (statistics, GNUNET_NO);
    statistics = NULL;
  }
  GNUNET_break (NULL == GNUNET_PLUGIN_unload (db_lib_name, GSN_database));
  GNUNET_free (db_lib_name);
  db_lib_name = NULL;
}

References db_lib_name, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_NO, GNUNET_notification_context_destroy(), GNUNET_PLUGIN_unload(), GNUNET_STATISTICS_destroy(), GSN_database, monitor_nc, and statistics.

Referenced by run().

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free_store_activity()

static void free_store_activity ( struct StoreActivity *  sa )

static

Release memory used by sa.

Parameters

sa	activity to free

Definition at line 435 of file gnunet-service-namestore.c.

{
  GNUNET_CONTAINER_DLL_remove (sa_head, sa_tail, sa);
  GNUNET_free (sa);
}

References GNUNET_CONTAINER_DLL_remove, GNUNET_free, sa_head, and sa_tail.

Referenced by client_disconnect_cb(), continue_store_activity(), and handle_tx_control().

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lookup_nick_it()

static void lookup_nick_it ( void *  cls, uint64_t  seq, const struct GNUNET_IDENTITY_PrivateKey *  private_key, const char *  label, unsigned int  rd_count, const struct GNUNET_GNSRECORD_Data *  rd  )

static

Function called with the records for the GNUNET_GNS_EMPTY_LABEL_AT label in the zone.

Used to locate the GNUNET_GNSRECORD_TYPE_NICK record, which (if found) is then copied to cls for future use.

Parameters

cls	a struct GNUNET_GNSRECORD_Data ** for storing the nick (if found)
seq	sequence number of the record, MUST NOT BE ZERO
private_key	the private key of the zone (unused)
label	should be GNUNET_GNS_EMPTY_LABEL_AT
rd_count	number of records in rd
rd	records stored under label in the zone

Definition at line 454 of file gnunet-service-namestore.c.

{
  struct GNUNET_GNSRECORD_Data **res = cls;
 
  (void) private_key;
  GNUNET_assert (0 != seq);
  if (0 != strcmp (label, GNUNET_GNS_EMPTY_LABEL_AT))
  {
    GNUNET_break (0);
    return;
  }
  for (unsigned int c = 0; c < rd_count; c++)
  {
    if (GNUNET_GNSRECORD_TYPE_NICK == rd[c].record_type)
    {
      (*res) =
        GNUNET_malloc (rd[c].data_size + sizeof(struct GNUNET_GNSRECORD_Data));
      (*res)->data = &(*res)[1];
      GNUNET_memcpy ((void *) (*res)->data, rd[c].data, rd[c].data_size);
      (*res)->data_size = rd[c].data_size;
      (*res)->expiration_time = rd[c].expiration_time;
      (*res)->flags = rd[c].flags;
      (*res)->record_type = GNUNET_GNSRECORD_TYPE_NICK;
      return;
    }
  }
  (*res) = NULL;
}

References GNUNET_GNSRECORD_Data::data, data_size, GNUNET_GNSRECORD_Data::data_size, GNUNET_GNSRECORD_Data::expiration_time, GNUNET_GNSRECORD_Data::flags, GNUNET_assert, GNUNET_break, GNUNET_GNS_EMPTY_LABEL_AT, GNUNET_GNSRECORD_TYPE_NICK, GNUNET_malloc, GNUNET_memcpy, rd, rd_count, GNUNET_GNSRECORD_Data::record_type, and res.

Referenced by get_nick_record().

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cache_nick()

static void cache_nick ( const struct GNUNET_IDENTITY_PrivateKey *  zone, const struct GNUNET_GNSRECORD_Data *  nick  )

static

Add entry to the cache for zone and nick.

Parameters

zone	zone key to cache under
nick	nick entry to cache

Definition at line 496 of file gnunet-service-namestore.c.

{
  struct NickCache *oldest;
 
  oldest = NULL;
  for (unsigned int i = 0; i < NC_SIZE; i++)
  {
    struct NickCache *pos = &nick_cache[i];
 
    if ((NULL == oldest) ||
        (oldest->last_used.abs_value_us > pos->last_used.abs_value_us))
      oldest = pos;
    if (0 == GNUNET_memcmp (zone, &pos->zone))
    {
      oldest = pos;
      break;
    }
  }
  GNUNET_free (oldest->rd);
  oldest->zone = *zone;
  if (NULL != nick)
  {
    oldest->rd = GNUNET_malloc (sizeof(*nick) + nick->data_size);
    *oldest->rd = *nick;
    oldest->rd->data = &oldest->rd[1];
    memcpy (&oldest->rd[1], nick->data, nick->data_size);
  }
  else
  {
    oldest->rd = NULL;
  }
  oldest->last_used = GNUNET_TIME_absolute_get ();
}

References GNUNET_TIME_Absolute::abs_value_us, GNUNET_GNSRECORD_Data::data, GNUNET_GNSRECORD_Data::data_size, GNUNET_free, GNUNET_malloc, GNUNET_memcmp, GNUNET_TIME_absolute_get(), NickCache::last_used, NC_SIZE, nick_cache, NickCache::rd, zone, and NickCache::zone.

Referenced by get_nick_record().

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get_nick_record()

static struct GNUNET_GNSRECORD_Data* get_nick_record ( const struct GNUNET_IDENTITY_PrivateKey *  zone )

static

Return the NICK record for the zone (if it exists).

Parameters

nc	the namestore client
zone	private key for the zone to look for nick

Returns

NULL if no NICK record was found

Definition at line 540 of file gnunet-service-namestore.c.

{
  struct GNUNET_IDENTITY_PublicKey pub;
  struct GNUNET_GNSRECORD_Data *nick;
  int res;
 
  /* check cache first */
  for (unsigned int i = 0; i < NC_SIZE; i++)
  {
    struct NickCache *pos = &nick_cache[i];
    if ((NULL != pos->rd) && (0 == GNUNET_memcmp (zone, &pos->zone)))
    {
      if (NULL == pos->rd)
        return NULL;
      nick = GNUNET_malloc (sizeof(*nick) + pos->rd->data_size);
      *nick = *pos->rd;
      nick->data = &nick[1];
      memcpy (&nick[1], pos->rd->data, pos->rd->data_size);
      pos->last_used = GNUNET_TIME_absolute_get ();
      return nick;
    }
  }
 
  nick = NULL;
  res = GSN_database->lookup_records (GSN_database->cls,
                                      zone,
                                      GNUNET_GNS_EMPTY_LABEL_AT,
                                      &lookup_nick_it,
                                      &nick);
  if ((GNUNET_OK != res) || (NULL == nick))
  {
#if ! defined(GNUNET_CULL_LOGGING)
    static int do_log = GNUNET_LOG_CALL_STATUS;
 
    if (0 == do_log)
      do_log = GNUNET_get_log_call_status (GNUNET_ERROR_TYPE_DEBUG,
                                           "namestore",
                                           __FILE__,
                                           __FUNCTION__,
                                           __LINE__);
    if (1 == do_log)
    {
      GNUNET_IDENTITY_key_get_public (zone, &pub);
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
                  "No nick name set for zone `%s'\n",
                  GNUNET_GNSRECORD_z2s (&pub));
    }
#endif
    /* update cache */
    cache_nick (zone, NULL);
    return NULL;
  }
 
  /* update cache */
  cache_nick (zone, nick);
  return nick;
}

References cache_nick(), GNUNET_NAMESTORE_PluginFunctions::cls, GNUNET_GNSRECORD_Data::data, GNUNET_GNSRECORD_Data::data_size, GNUNET_ERROR_TYPE_BULK, GNUNET_ERROR_TYPE_DEBUG, GNUNET_get_log_call_status(), GNUNET_GNS_EMPTY_LABEL_AT, GNUNET_GNSRECORD_z2s(), GNUNET_IDENTITY_key_get_public(), GNUNET_log, GNUNET_LOG_CALL_STATUS, GNUNET_malloc, GNUNET_memcmp, GNUNET_OK, GNUNET_TIME_absolute_get(), GSN_database, NickCache::last_used, lookup_nick_it(), GNUNET_NAMESTORE_PluginFunctions::lookup_records, NC_SIZE, nick_cache, pub, NickCache::rd, res, zone, and NickCache::zone.

Referenced by handle_record_lookup(), and send_lookup_response_with_filter().

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merge_with_nick_records()

static void merge_with_nick_records ( const struct GNUNET_GNSRECORD_Data *  nick_rd, unsigned int  rd2_length, const struct GNUNET_GNSRECORD_Data *  rd2, unsigned int *  rdc_res, struct GNUNET_GNSRECORD_Data **  rd_res  )

static

Merge the nick record nick_rd with the rest of the record set given in rd2.

Store the result in rdc_res and rd_res. The nick_rd's expiration time is set to the maximum expiration time of all of the records in rd2.

Parameters

	nick_rd	the nick record to integrate
	rd2_length	length of the rd2 array
	rd2	array of records
[out]	rdc_res	length of the resulting rd_res array
[out]	rd_res	set to an array of records, including nick_rd and rd2; all of the variable-size 'data' fields in rd2 are allocated in the same chunk of memory!

Definition at line 615 of file gnunet-service-namestore.c.

{
  uint64_t latest_expiration;
  size_t req;
  char *data;
  size_t data_offset;
  struct GNUNET_GNSRECORD_Data *target;
 
  (*rdc_res) = 1 + rd2_length;
  if (0 == 1 + rd2_length)
  {
    GNUNET_break (0);
    (*rd_res) = NULL;
    return;
  }
  req = sizeof(struct GNUNET_GNSRECORD_Data) + nick_rd->data_size;
  for (unsigned int i = 0; i < rd2_length; i++)
  {
    const struct GNUNET_GNSRECORD_Data *orig = &rd2[i];
 
    if (req + sizeof(struct GNUNET_GNSRECORD_Data) + orig->data_size < req)
    {
      GNUNET_break (0);
      (*rd_res) = NULL;
      return;
    }
    req += sizeof(struct GNUNET_GNSRECORD_Data) + orig->data_size;
  }
  target = GNUNET_malloc (req);
  (*rd_res) = target;
  data = (char *) &target[1 + rd2_length];
  data_offset = 0;
  latest_expiration = 0;
  for (unsigned int i = 0; i < rd2_length; i++)
  {
    const struct GNUNET_GNSRECORD_Data *orig = &rd2[i];
 
    if (0 != (orig->flags & GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION))
    {
      if ((GNUNET_TIME_absolute_get ().abs_value_us + orig->expiration_time) >
          latest_expiration)
        latest_expiration = orig->expiration_time;
    }
    else if (orig->expiration_time > latest_expiration)
      latest_expiration = orig->expiration_time;
    target[i] = *orig;
    target[i].data = (void *) &data[data_offset];
    GNUNET_memcpy (&data[data_offset], orig->data, orig->data_size);
    data_offset += orig->data_size;
  }
  /* append nick */
  target[rd2_length] = *nick_rd;
  /* Mark as supplemental */
  target[rd2_length].flags = nick_rd->flags | GNUNET_GNSRECORD_RF_SUPPLEMENTAL;
  target[rd2_length].expiration_time = latest_expiration;
  target[rd2_length].data = (void *) &data[data_offset];
  GNUNET_memcpy (&data[data_offset], nick_rd->data, nick_rd->data_size);
  data_offset += nick_rd->data_size;
  GNUNET_assert (req == (sizeof(struct GNUNET_GNSRECORD_Data)) * (*rdc_res)
                 + data_offset);
}

References GNUNET_GNSRECORD_Data::data, data, data_size, GNUNET_GNSRECORD_Data::data_size, GNUNET_GNSRECORD_Data::expiration_time, GNUNET_GNSRECORD_Data::flags, GNUNET_assert, GNUNET_break, GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION, GNUNET_GNSRECORD_RF_SUPPLEMENTAL, GNUNET_malloc, GNUNET_memcpy, and GNUNET_TIME_absolute_get().

Referenced by lookup_it(), and send_lookup_response_with_filter().

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send_lookup_response_with_filter()

static int send_lookup_response_with_filter ( struct NamestoreClient *  nc, uint32_t  request_id, const struct GNUNET_IDENTITY_PrivateKey *  zone_key, const char *  name, unsigned int  rd_count, const struct GNUNET_GNSRECORD_Data *  rd, enum GNUNET_GNSRECORD_Filter  filter  )

static

Generate a struct LookupNameResponseMessage and send it to the given client using the given notification context.

Parameters

nc	client to unicast to
request_id	request ID to use
zone_key	zone key of the zone
name	name
rd_count	number of records in rd
rd	array of records
filter	record set filter

FIXME if we ever support GNUNET_NAMESTORE_OMIT_PUBLIC, we need to omit adding this public record here

Definition at line 695 of file gnunet-service-namestore.c.

{
  struct GNUNET_MQ_Envelope *env;
  struct RecordResultMessage *zir_msg;
  struct GNUNET_GNSRECORD_Data *nick;
  struct GNUNET_GNSRECORD_Data *res;
  struct GNUNET_GNSRECORD_Data rd_nf[rd_count];
  struct GNUNET_TIME_Absolute block_exp = GNUNET_TIME_UNIT_ZERO_ABS;;
  unsigned int res_count;
  unsigned int rd_nf_count;
  size_t name_len;
  size_t key_len;
  ssize_t rd_ser_len;
  char *name_tmp;
  char *rd_ser;
  char *emsg;
 
  nick = get_nick_record (zone_key);
  GNUNET_assert (-1 != GNUNET_GNSRECORD_records_get_size (rd_count, rd));
 
  if (GNUNET_OK != GNUNET_GNSRECORD_normalize_record_set (name,
                                                          rd,
                                                          rd_count,
                                                          rd_nf,
                                                          &rd_nf_count,
                                                          &block_exp,
                                                          filter,
                                                          &emsg))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "%s\n", emsg);
    GNUNET_free (emsg);
    GNUNET_assert (0);
  }
 
  if ((NULL != nick) && (0 != strcmp (name, GNUNET_GNS_EMPTY_LABEL_AT)))
  {
    nick->flags =
      (nick->flags | GNUNET_GNSRECORD_RF_PRIVATE) ^ GNUNET_GNSRECORD_RF_PRIVATE;
    merge_with_nick_records (nick, rd_nf_count, rd_nf, &res_count, &res);
  }
  else
  {
    res_count = rd_nf_count;
    res = (struct GNUNET_GNSRECORD_Data *) rd_nf;
  }
  if (NULL != nick)
    GNUNET_free (nick);
 
  if (0 == res_count)
  {
    if (rd_nf != res)
      GNUNET_free (res);
    return 0;
  }
  GNUNET_assert (-1 != GNUNET_GNSRECORD_records_get_size (res_count, res));
 
 
  name_len = strlen (name) + 1;
  rd_ser_len = GNUNET_GNSRECORD_records_get_size (res_count, res);
  if (rd_ser_len < 0)
  {
    if (rd_nf != res)
      GNUNET_free (res);
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (nc->client);
    return 0;
  }
  if (((size_t) rd_ser_len) >= UINT16_MAX - name_len - sizeof(*zir_msg))
  {
    if (rd_nf != res)
      GNUNET_free (res);
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (nc->client);
    return 0;
  }
  key_len = GNUNET_IDENTITY_private_key_get_length (zone_key);
  env = GNUNET_MQ_msg_extra (zir_msg,
                             name_len + rd_ser_len + key_len,
                             GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_RESULT);
  zir_msg->gns_header.r_id = htonl (request_id);
  zir_msg->name_len = htons (name_len);
  zir_msg->rd_count = htons (res_count);
  zir_msg->rd_len = htons ((uint16_t) rd_ser_len);
  zir_msg->key_len = htons (key_len);
  GNUNET_IDENTITY_write_private_key_to_buffer (zone_key,
                                               &zir_msg[1],
                                               key_len);
  zir_msg->expire = GNUNET_TIME_absolute_hton (block_exp);
  name_tmp = (char *) &zir_msg[1] + key_len;
  GNUNET_memcpy (name_tmp, name, name_len);
  rd_ser = &name_tmp[name_len];
  GNUNET_assert (
    rd_ser_len ==
    GNUNET_GNSRECORD_records_serialize (res_count, res, rd_ser_len, rd_ser));
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Sending RECORD_RESULT message with %u records\n",
              res_count);
  GNUNET_STATISTICS_update (statistics,
                            "Record sets sent to clients",
                            1,
                            GNUNET_NO);
  GNUNET_MQ_send (nc->mq, env);
  if (rd_nf != res)
    GNUNET_free (res);
  return res_count;
}

References env, RecordResultMessage::expire, filter, GNUNET_GNSRECORD_Data::flags, get_nick_record(), RecordResultMessage::gns_header, GNUNET_assert, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_GNS_EMPTY_LABEL_AT, GNUNET_GNSRECORD_normalize_record_set(), GNUNET_GNSRECORD_records_get_size(), GNUNET_GNSRECORD_records_serialize(), GNUNET_GNSRECORD_RF_PRIVATE, GNUNET_IDENTITY_private_key_get_length(), GNUNET_IDENTITY_write_private_key_to_buffer(), GNUNET_log, GNUNET_memcpy, GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_RESULT, GNUNET_MQ_msg_extra, GNUNET_MQ_send(), GNUNET_NO, GNUNET_OK, GNUNET_SERVICE_client_drop(), GNUNET_STATISTICS_update(), GNUNET_TIME_absolute_hton(), GNUNET_TIME_UNIT_ZERO_ABS, RecordResultMessage::key_len, merge_with_nick_records(), GNUNET_PEERINFO_NotifyContext::mq, name, RecordResultMessage::name_len, nc, GNUNET_NAMESTORE_Header::r_id, rd, rd_count, RecordResultMessage::rd_count, RecordResultMessage::rd_len, res, statistics, and zone_key.

Referenced by check_monitor_start(), continue_store_activity(), and zone_iterate_proc().

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send_store_response()

static void send_store_response ( struct NamestoreClient *  nc, enum GNUNET_ErrorCode  ec, uint32_t  rid  )

static

Send response to the store request to the client.

Parameters

nc	client to talk to
ec	status of the operation
rid	client's request ID

Definition at line 821 of file gnunet-service-namestore.c.

{
  struct GNUNET_MQ_Envelope *env;
  struct RecordStoreResponseMessage *rcr_msg;
 
  GNUNET_assert (NULL != nc);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Sending RECORD_STORE_RESPONSE message\n");
  GNUNET_STATISTICS_update (statistics,
                            "Store requests completed",
                            1,
                            GNUNET_NO);
  env = GNUNET_MQ_msg (rcr_msg,
                       GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE_RESPONSE);
  rcr_msg->gns_header.r_id = htonl (rid);
  rcr_msg->ec = htonl (ec);
  GNUNET_MQ_send (nc->mq, env);
}

References RecordStoreResponseMessage::ec, env, RecordStoreResponseMessage::gns_header, GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE_RESPONSE, GNUNET_MQ_msg, GNUNET_MQ_send(), GNUNET_NO, GNUNET_STATISTICS_update(), GNUNET_PEERINFO_NotifyContext::mq, nc, GNUNET_NAMESTORE_Header::r_id, and statistics.

Referenced by continue_store_activity(), and handle_record_store().

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zone_iteration_done_client_continue()

static void zone_iteration_done_client_continue ( struct ZoneIteration *  zi )

static

Function called once we are done with the zone iteration and allow the zone iteration client to send us more messages.

Parameters

zi	zone iteration we are processing

Definition at line 850 of file gnunet-service-namestore.c.

{
  struct GNUNET_MQ_Envelope *env;
  struct GNUNET_NAMESTORE_Header *em;
 
  GNUNET_SERVICE_client_continue (zi->nc->client);
  if (! zi->send_end)
    return;
  /* send empty response to indicate end of list */
  env = GNUNET_MQ_msg (em, GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_RESULT_END);
  em->r_id = htonl (zi->request_id);
  GNUNET_MQ_send (zi->nc->mq, env);
 
  GNUNET_CONTAINER_DLL_remove (zi->nc->op_head, zi->nc->op_tail, zi);
  GNUNET_free (zi);
}

References NamestoreClient::client, env, GNUNET_CONTAINER_DLL_remove, GNUNET_free, GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_RESULT_END, GNUNET_MQ_msg, GNUNET_MQ_send(), GNUNET_SERVICE_client_continue(), NamestoreClient::mq, ZoneIteration::nc, NamestoreClient::op_head, NamestoreClient::op_tail, GNUNET_NAMESTORE_Header::r_id, ZoneIteration::request_id, and ZoneIteration::send_end.

Referenced by check_iteration_start().

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warn_monitor_slow()

static void warn_monitor_slow ( void *  cls )

static

Print a warning that one of our monitors is no longer reacting.

Parameters

cls	a struct ZoneMonitor to warn about

Definition at line 876 of file gnunet-service-namestore.c.

{
  struct ZoneMonitor *zm = cls;
 
  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
              "No response from monitor since %s\n",
              GNUNET_STRINGS_absolute_time_to_string (zm->sa_waiting_start));
  zm->sa_wait_warning = GNUNET_SCHEDULER_add_delayed (MONITOR_STALL_WARN_DELAY,
                                                      &warn_monitor_slow,
                                                      zm);
}

References GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_SCHEDULER_add_delayed(), GNUNET_STRINGS_absolute_time_to_string(), MONITOR_STALL_WARN_DELAY, and zm.

Referenced by continue_store_activity(), handle_monitor_next(), and monitor_unblock().

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continue_store_activity()

static int continue_store_activity ( struct StoreActivity *  sa, int  call_continue  )

static

Continue processing the sa.

Parameters

sa	store activity to process

Definition at line 895 of file gnunet-service-namestore.c.

{
  const struct RecordSet *rd_set = sa->rs;
  unsigned int rd_count;
  size_t name_len;
  size_t rd_ser_len;
  const char *name_tmp;
  const char *rd_ser;
  const char *buf;
  char *conv_name;
 
  // If we are in a transaction, do not notify monitors or update
  // cached. This will be done when we are commiting.
  if (GNUNET_YES == sa->uncommited)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Transaction not yet committed, delaying monitor and cache updates\n");
    send_store_response (sa->nc, GNUNET_EC_NONE, sa->rid);
    if (GNUNET_YES == call_continue)
      GNUNET_SERVICE_client_continue (sa->nc->client);
    return GNUNET_OK;
  }
  buf = (const char *) &sa[1];
  for (int i = sa->rd_set_pos; i < sa->rd_set_count; i++)
  {
    rd_set = (struct RecordSet *) buf;
    name_len = ntohs (rd_set->name_len);
    rd_count = ntohs (rd_set->rd_count);
    rd_ser_len = ntohs (rd_set->rd_len);
    name_tmp = (const char *) &rd_set[1];
    rd_ser = &name_tmp[name_len];
    conv_name = GNUNET_GNSRECORD_string_normalize (name_tmp);
    GNUNET_assert (NULL != conv_name);
    {
      struct GNUNET_GNSRECORD_Data rd[GNUNET_NZL (rd_count)];
 
      /* We did this before, must succeed again */
      GNUNET_assert (
        GNUNET_OK ==
        GNUNET_GNSRECORD_records_deserialize (rd_ser_len, rd_ser, rd_count,
                                              rd));
 
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Checking monitors watching for `%s'\n",
                  conv_name);
      for (struct ZoneMonitor *zm = sa->zm_pos; NULL != zm; zm = sa->zm_pos)
      {
        if ((0 != GNUNET_memcmp (&sa->private_key, &zm->zone)) &&
            (0 != GNUNET_memcmp (&zm->zone, &zero)))
        {
          sa->zm_pos = zm->next;   /* not interesting to this monitor */
          continue;
        }
        if (zm->limit == zm->iteration_cnt)
        {
          zm->sa_waiting = GNUNET_YES;
          zm->sa_waiting_start = GNUNET_TIME_absolute_get ();
          if (NULL != zm->sa_wait_warning)
            GNUNET_SCHEDULER_cancel (zm->sa_wait_warning);
          zm->sa_wait_warning =
            GNUNET_SCHEDULER_add_delayed (MONITOR_STALL_WARN_DELAY,
                                          &warn_monitor_slow,
                                          zm);
          GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                      "Monitor is blocking client for `%s'\n",
                      conv_name);
          GNUNET_free (conv_name);
          return GNUNET_NO;    /* blocked on zone monitor */
        }
        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                    "Notifying monitor about changes under label `%s'\n",
                    conv_name);
        if (0 < send_lookup_response_with_filter (zm->nc,
                                                  0,
                                                  &sa->private_key,
                                                  conv_name,
                                                  rd_count,
                                                  rd,
                                                  zm->filter))
          zm->limit--;
        sa->zm_pos = zm->next;
      }
      sa->rd_set_pos++;
      GNUNET_free (conv_name);
    }
  }
  if (GNUNET_YES == call_continue)
    GNUNET_SERVICE_client_continue (sa->nc->client);
  send_store_response (sa->nc, GNUNET_EC_NONE, sa->rid);
  free_store_activity (sa);
  return GNUNET_OK;
}

References buf, NamestoreClient::client, GNUNET_NAMESTORE_ZoneMonitor::filter, free_store_activity(), GNUNET_assert, GNUNET_EC_NONE, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_GNSRECORD_records_deserialize(), GNUNET_GNSRECORD_string_normalize(), GNUNET_log, GNUNET_memcmp, GNUNET_NO, GNUNET_NZL, GNUNET_OK, GNUNET_SCHEDULER_add_delayed(), GNUNET_SCHEDULER_cancel(), GNUNET_SERVICE_client_continue(), GNUNET_TIME_absolute_get(), GNUNET_YES, MONITOR_STALL_WARN_DELAY, RecordSet::name_len, StoreActivity::nc, StoreActivity::private_key, rd, rd_count, RecordSet::rd_count, RecordSet::rd_len, StoreActivity::rd_set_pos, StoreActivity::rid, StoreActivity::rs, send_lookup_response_with_filter(), send_store_response(), StoreActivity::uncommited, warn_monitor_slow(), zero, zm, StoreActivity::zm_pos, and GNUNET_NAMESTORE_ZoneMonitor::zone.

Referenced by client_disconnect_cb(), handle_record_store(), handle_tx_control(), and monitor_unblock().

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client_disconnect_cb()

static void client_disconnect_cb ( void *  cls, struct GNUNET_SERVICE_Client *  client, void *  app_ctx  )

static

Called whenever a client is disconnected.

Frees our resources associated with that client.

Parameters

cls	closure
client	identification of the client
app_ctx	the struct NamestoreClient of client

Definition at line 999 of file gnunet-service-namestore.c.

{
  struct NamestoreClient *nc = app_ctx;
  struct ZoneIteration *no;
  struct StoreActivity *sa = sa_head;
  struct StoreActivity *sn;
  char *emsg;
 
  (void) cls;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client %p disconnected\n", client);
  if (GNUNET_YES == nc->in_transaction)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "Client in transaction, rolling back...\n");
    if (GNUNET_SYSERR == nc->GSN_database->transaction_rollback (
          nc->GSN_database->cls,
          &emsg))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Unable to roll back: %s\n", emsg);
      GNUNET_free (emsg);
    }
    else
    {
      nc->in_transaction = GNUNET_NO;
      while (NULL != sa)
      {
        if ((nc != sa->nc) ||
            (GNUNET_NO == sa->uncommited))
        {
          sa = sa->next;
          continue;
        }
        sn = sa->next;
        free_store_activity (sa);
        sa = sn;
      }
    }
  }
  for (struct ZoneMonitor *zm = monitor_head; NULL != zm; zm = zm->next)
  {
    if (nc != zm->nc)
      continue;
    GNUNET_CONTAINER_DLL_remove (monitor_head, monitor_tail, zm);
    if (NULL != zm->task)
    {
      GNUNET_SCHEDULER_cancel (zm->task);
      zm->task = NULL;
    }
    if (NULL != zm->sa_wait_warning)
    {
      GNUNET_SCHEDULER_cancel (zm->sa_wait_warning);
      zm->sa_wait_warning = NULL;
    }
    for (sa = sa_head; NULL != sa; sa = sn)
    {
      sn = sa->next;
      if (zm == sa->zm_pos)
      {
        sa->zm_pos = zm->next;
        /* this may free sa */
        continue_store_activity (sa, GNUNET_YES);
      }
    }
    GNUNET_free (zm);
    break;
  }
  sa = sa_head;
  while (NULL != sa)
  {
    if (nc != sa->nc)
    {
      sa = sa->next;
      continue;
    }
    sn = sa->next;
    free_store_activity (sa);
    sa = sn;
  }
  while (NULL != (no = nc->op_head))
  {
    GNUNET_CONTAINER_DLL_remove (nc->op_head, nc->op_tail, no);
    GNUNET_free (no);
  }
  GNUNET_break (NULL == GNUNET_PLUGIN_unload (nc->db_lib_name,
                                              nc->GSN_database));
  GNUNET_free (nc->db_lib_name);
  GNUNET_free (nc);
}

References continue_store_activity(), free_store_activity(), GNUNET_break, GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_NO, GNUNET_PLUGIN_unload(), GNUNET_SCHEDULER_cancel(), GNUNET_SYSERR, GNUNET_YES, monitor_head, monitor_tail, nc, StoreActivity::nc, StoreActivity::next, sa_head, StoreActivity::uncommited, zm, and StoreActivity::zm_pos.

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client_connect_cb()

static void* client_connect_cb ( void *  cls, struct GNUNET_SERVICE_Client *  client, struct GNUNET_MQ_Handle *  mq  )

static

Add a client to our list of active clients.

Parameters

cls	NULL
client	client to add
mq	message queue for client

Returns

internal namestore client structure for this client

Definition at line 1101 of file gnunet-service-namestore.c.

{
  struct NamestoreClient *nc;
  char *database;
 
  (void) cls;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client %p connected\n", client);
  nc = GNUNET_new (struct NamestoreClient);
  nc->client = client;
  nc->mq = mq;
  /* Loading database plugin */
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (GSN_cfg,
                                                          "namestore",
                                                          "database",
                                                          &database))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No database backend configured\n");
    GNUNET_free (nc);
    return NULL;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Loading %s\n", db_lib_name);
  nc->GSN_database = GNUNET_PLUGIN_load (db_lib_name, (void *) GSN_cfg);
  GNUNET_free (database);
  if (NULL == nc->GSN_database)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Could not load database backend `%s'\n",
                db_lib_name);
    GNUNET_free (nc);
    return NULL;
  }
  nc->db_lib_name = GNUNET_strdup (db_lib_name);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Loaded %s\n", db_lib_name);
  return nc;
}

References NamestoreClient::client, db_lib_name, GNUNET_CONFIGURATION_get_value_string(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_new, GNUNET_OK, GNUNET_PLUGIN_load(), GNUNET_strdup, GSN_cfg, mq, GNUNET_PEERINFO_NotifyContext::mq, and nc.

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lookup_it()

static void lookup_it ( void *  cls, uint64_t  seq, const struct GNUNET_IDENTITY_PrivateKey *  private_key, const char *  label, unsigned int  rd_count_nf, const struct GNUNET_GNSRECORD_Data *  rd_nf  )

static

Function called by the namestore plugin when we are trying to lookup a record as part of handle_record_lookup().

Merges all results into the context.

Parameters

cls	closure with a struct RecordLookupContext
seq	unique serial number of the record, MUST NOT BE ZERO
private_key	private key of the zone
label	name that is being mapped (at most 255 characters long)
rd_count	number of entries in rd array
rd	array of records with data to store

Definition at line 1195 of file gnunet-service-namestore.c.

{
  struct RecordLookupContext *rlc = cls;
  struct GNUNET_GNSRECORD_Data rd[rd_count_nf];
  struct GNUNET_TIME_Absolute block_exp;
  unsigned int rd_count = 0;
  char *emsg;
 
  (void) private_key;
  GNUNET_assert (0 != seq);
  if (0 != strcmp (label, rlc->label))
    return;
  rlc->found = GNUNET_YES;
 
  if (GNUNET_OK != GNUNET_GNSRECORD_normalize_record_set (rlc->label,
                                                          rd_nf,
                                                          rd_count_nf,
                                                          rd,
                                                          &rd_count,
                                                          &block_exp,
                                                          rlc->filter,
                                                          &emsg))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "%s\n", emsg);
    GNUNET_free (emsg);
    GNUNET_assert (0);
  }
 
  if (0 == rd_count)
  {
    rlc->rd_ser_len = 0;
    rlc->res_rd_count = 0;
    rlc->res_rd = NULL;
    return;
  }
  if ((NULL != rlc->nick) && (0 != strcmp (label, GNUNET_GNS_EMPTY_LABEL_AT)))
  {
    /* Merge */
    struct GNUNET_GNSRECORD_Data *rd_res;
    unsigned int rdc_res;
 
    rd_res = NULL;
    rdc_res = 0;
    rlc->nick->flags = (rlc->nick->flags | GNUNET_GNSRECORD_RF_PRIVATE)
                       ^ GNUNET_GNSRECORD_RF_PRIVATE;
    merge_with_nick_records (rlc->nick, rd_count, rd, &rdc_res, &rd_res);
    rlc->rd_ser_len = GNUNET_GNSRECORD_records_get_size (rdc_res, rd_res);
    if (rlc->rd_ser_len < 0)
    {
      GNUNET_break (0);
      GNUNET_free (rd_res);
      rlc->found = GNUNET_NO;
      rlc->rd_ser_len = 0;
      return;
    }
    rlc->res_rd_count = rdc_res;
    rlc->res_rd = GNUNET_malloc (rlc->rd_ser_len);
    if (rlc->rd_ser_len != GNUNET_GNSRECORD_records_serialize (rdc_res,
                                                               rd_res,
                                                               rlc->rd_ser_len,
                                                               rlc->res_rd))
    {
      GNUNET_break (0);
      GNUNET_free (rlc->res_rd);
      rlc->res_rd = NULL;
      rlc->res_rd_count = 0;
      rlc->rd_ser_len = 0;
      GNUNET_free (rd_res);
      rlc->found = GNUNET_NO;
      return;
    }
    GNUNET_free (rd_res);
    GNUNET_free (rlc->nick);
    rlc->nick = NULL;
  }
  else
  {
    rlc->rd_ser_len = GNUNET_GNSRECORD_records_get_size (rd_count, rd);
    if (rlc->rd_ser_len < 0)
    {
      GNUNET_break (0);
      rlc->found = GNUNET_NO;
      rlc->rd_ser_len = 0;
      return;
    }
    rlc->res_rd_count = rd_count;
    rlc->res_rd = GNUNET_malloc (rlc->rd_ser_len);
    if (rlc->rd_ser_len != GNUNET_GNSRECORD_records_serialize (rd_count,
                                                               rd,
                                                               rlc->rd_ser_len,
                                                               rlc->res_rd))
    {
      GNUNET_break (0);
      GNUNET_free (rlc->res_rd);
      rlc->res_rd = NULL;
      rlc->res_rd_count = 0;
      rlc->rd_ser_len = 0;
      rlc->found = GNUNET_NO;
      return;
    }
  }
}

References RecordLookupContext::filter, GNUNET_GNSRECORD_Data::flags, RecordLookupContext::found, GNUNET_assert, GNUNET_break, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_GNS_EMPTY_LABEL_AT, GNUNET_GNSRECORD_normalize_record_set(), GNUNET_GNSRECORD_records_get_size(), GNUNET_GNSRECORD_records_serialize(), GNUNET_GNSRECORD_RF_PRIVATE, GNUNET_log, GNUNET_malloc, GNUNET_NO, GNUNET_OK, GNUNET_YES, RecordLookupContext::label, merge_with_nick_records(), RecordLookupContext::nick, rd, rd_count, RecordLookupContext::rd_ser_len, RecordLookupContext::res_rd, and RecordLookupContext::res_rd_count.

Referenced by handle_record_lookup().

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check_record_lookup()

static int check_record_lookup ( void *  cls, const struct LabelLookupMessage *  ll_msg  )

static

Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_LOOKUP message.

Parameters

cls	client sending the message
ll_msg	message of type struct LabelLookupMessage

Returns

GNUNET_OK if ll_msg is well-formed

Definition at line 1312 of file gnunet-service-namestore.c.

{
  uint32_t name_len;
  size_t src_size;
  size_t key_len;
 
  (void) cls;
  name_len = ntohs (ll_msg->label_len);
  key_len = ntohs (ll_msg->key_len);
  src_size = ntohs (ll_msg->gns_header.header.size);
  if (name_len + key_len != src_size - sizeof(struct LabelLookupMessage))
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  return GNUNET_OK;
}

References LabelLookupMessage::gns_header, GNUNET_break, GNUNET_OK, GNUNET_SYSERR, GNUNET_NAMESTORE_Header::header, LabelLookupMessage::key_len, LabelLookupMessage::label_len, and GNUNET_MessageHeader::size.

handle_record_lookup()

static void handle_record_lookup ( void *  cls, const struct LabelLookupMessage *  ll_msg  )

static

Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_LOOKUP message.

Parameters

cls	client sending the message
ll_msg	message of type struct LabelLookupMessage

Definition at line 1338 of file gnunet-service-namestore.c.

{
  struct GNUNET_IDENTITY_PrivateKey zone;
  struct NamestoreClient *nc = cls;
  struct GNUNET_MQ_Envelope *env;
  struct LabelLookupResponseMessage *llr_msg;
  struct RecordLookupContext rlc;
  const char *name_tmp;
  char *res_name;
  char *conv_name;
  uint32_t name_len;
  int res;
  size_t key_len;
  size_t kb_read;
 
  key_len = ntohs (ll_msg->key_len);
  if ((GNUNET_SYSERR ==
       GNUNET_IDENTITY_read_private_key_from_buffer (&ll_msg[1],
                                                     key_len,
                                                     &zone,
                                                     &kb_read)) ||
      (kb_read != key_len))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Error reading private key\n");
    GNUNET_SERVICE_client_drop (nc->client);
    return;
  }
  name_tmp = (const char *) &ll_msg[1] + key_len;
  GNUNET_SERVICE_client_continue (nc->client);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received NAMESTORE_RECORD_LOOKUP message for name `%s'\n",
              name_tmp);
 
  conv_name = GNUNET_GNSRECORD_string_normalize (name_tmp);
  if (NULL == conv_name)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Error converting name `%s'\n",
                name_tmp);
    GNUNET_SERVICE_client_drop (nc->client);
    return;
  }
  name_len = strlen (conv_name) + 1;
  rlc.label = conv_name;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Looking up with filter %u\n", ntohs (ll_msg->filter));
  rlc.filter = ntohs (ll_msg->filter);
  rlc.found = GNUNET_NO;
  rlc.res_rd_count = 0;
  rlc.res_rd = NULL;
  rlc.rd_ser_len = 0;
  rlc.nick = get_nick_record (&zone);
  if (GNUNET_YES != ntohs (ll_msg->is_edit_request))
    res = nc->GSN_database->lookup_records (nc->GSN_database->cls,
                                            &zone,
                                            conv_name,
                                            &lookup_it,
                                            &rlc);
  else
    res = nc->GSN_database->edit_records (nc->GSN_database->cls,
                                          &zone,
                                          conv_name,
                                          &lookup_it,
                                          &rlc);
 
  env =
    GNUNET_MQ_msg_extra (llr_msg,
                         key_len + name_len + rlc.rd_ser_len,
                         GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_LOOKUP_RESPONSE);
  llr_msg->gns_header.r_id = ll_msg->gns_header.r_id;
  GNUNET_memcpy (&llr_msg[1], &ll_msg[1], key_len);
  llr_msg->key_len = ll_msg->key_len;
  llr_msg->name_len = htons (name_len);
  llr_msg->rd_count = htons (rlc.res_rd_count);
  llr_msg->rd_len = htons (rlc.rd_ser_len);
  llr_msg->reserved = htons (0);
  res_name = ((char *) &llr_msg[1]) + key_len;
  if (GNUNET_YES == rlc.found)
    llr_msg->found = htons (GNUNET_YES);
  else if (GNUNET_SYSERR == res)
    llr_msg->found = htons (GNUNET_SYSERR);
  else
    llr_msg->found = htons (GNUNET_NO);
  GNUNET_memcpy (res_name, conv_name, name_len);
  GNUNET_memcpy (&res_name[name_len], rlc.res_rd, rlc.rd_ser_len);
  GNUNET_MQ_send (nc->mq, env);
  GNUNET_free (rlc.res_rd);
  GNUNET_free (conv_name);
}

References env, RecordLookupContext::filter, LabelLookupMessage::filter, RecordLookupContext::found, LabelLookupResponseMessage::found, get_nick_record(), LabelLookupMessage::gns_header, LabelLookupResponseMessage::gns_header, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_GNSRECORD_string_normalize(), GNUNET_IDENTITY_read_private_key_from_buffer(), GNUNET_log, GNUNET_memcpy, GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_LOOKUP_RESPONSE, GNUNET_MQ_msg_extra, GNUNET_MQ_send(), GNUNET_NO, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), GNUNET_SYSERR, GNUNET_YES, LabelLookupMessage::is_edit_request, LabelLookupMessage::key_len, LabelLookupResponseMessage::key_len, RecordLookupContext::label, lookup_it(), GNUNET_PEERINFO_NotifyContext::mq, LabelLookupResponseMessage::name_len, nc, RecordLookupContext::nick, GNUNET_NAMESTORE_Header::r_id, LabelLookupResponseMessage::rd_count, LabelLookupResponseMessage::rd_len, RecordLookupContext::rd_ser_len, res, RecordLookupContext::res_rd, RecordLookupContext::res_rd_count, LabelLookupResponseMessage::reserved, and zone.

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check_record_store()

static int check_record_store ( void *  cls, const struct RecordStoreMessage *  rp_msg  )

static

Checks a GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE message.

Parameters

cls	client sending the message
rp_msg	message of type struct RecordStoreMessage

Returns

GNUNET_OK if rp_msg is well-formed

Definition at line 1439 of file gnunet-service-namestore.c.

{
  size_t msg_size;
  size_t min_size_exp;
  size_t rd_set_count;
  size_t key_len;
 
  (void) cls;
  msg_size = ntohs (rp_msg->gns_header.header.size);
  rd_set_count = ntohs (rp_msg->rd_set_count);
  key_len = ntohs (rp_msg->key_len);
 
  min_size_exp = sizeof(*rp_msg) + key_len + sizeof (struct RecordSet)
                 * rd_set_count;
  if (msg_size < min_size_exp)
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  return GNUNET_OK;
}

References RecordStoreMessage::gns_header, GNUNET_break, GNUNET_OK, GNUNET_SYSERR, GNUNET_NAMESTORE_Header::header, RecordStoreMessage::key_len, RecordStoreMessage::rd_set_count, and GNUNET_MessageHeader::size.

get_existing_rd_exp()

static void get_existing_rd_exp ( void *  cls, uint64_t  seq, const struct GNUNET_IDENTITY_PrivateKey *  private_key, const char *  label, unsigned int  rd_count, const struct GNUNET_GNSRECORD_Data *  rd  )

static

Check if set contains a tombstone, store if necessary.

Parameters

cls	a struct GNUNET_GNSRECORD_Data ** for storing the nick (if found)
seq	sequence number of the record, MUST NOT BE ZERO
private_key	the private key of the zone (unused)
label	should be GNUNET_GNS_EMPTY_LABEL_AT
rd_count	number of records in rd
rd	records stored under label in the zone

Definition at line 1489 of file gnunet-service-namestore.c.

{
  struct LookupExistingRecordsContext *lctx = cls;
  struct GNUNET_GNSRECORD_Data rd_pub[rd_count];
  unsigned int rd_pub_count;
  char *emsg;
 
  if ((1 == rd_count) &&
      (GNUNET_GNSRECORD_TYPE_TOMBSTONE == rd[0].record_type))
  {
    /* This record set contains only a tombstone! */
    lctx->only_tombstone = GNUNET_YES;
  }
  if (GNUNET_OK !=
      GNUNET_GNSRECORD_normalize_record_set (label,
                                             rd,
                                             rd_count,
                                             rd_pub,
                                             &rd_pub_count,
                                             &lctx->exp,
                                             GNUNET_GNSRECORD_FILTER_OMIT_PRIVATE,
                                             &emsg))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "%s\n", emsg);
    GNUNET_free (emsg);
  }
}

References LookupExistingRecordsContext::exp, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_GNSRECORD_FILTER_OMIT_PRIVATE, GNUNET_GNSRECORD_normalize_record_set(), GNUNET_GNSRECORD_TYPE_TOMBSTONE, GNUNET_log, GNUNET_OK, GNUNET_YES, LookupExistingRecordsContext::only_tombstone, rd, rd_count, and GNUNET_GNSRECORD_Data::record_type.

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store_record_set()

static enum GNUNET_ErrorCode store_record_set ( struct NamestoreClient *  nc, const struct GNUNET_IDENTITY_PrivateKey *  private_key, const struct RecordSet *  rd_set, ssize_t *  len  )

static

Definition at line 1489 of file gnunet-service-namestore.c.

{
  size_t name_len;
  size_t rd_ser_len;
  const char *name_tmp;
  const char *rd_ser;
  char *conv_name;
  char *emsg;
  unsigned int rd_count;
  int res;
  enum GNUNET_ErrorCode ec;
  struct GNUNET_TIME_Absolute new_block_exp;
  struct LookupExistingRecordsContext lctx;
  *len = sizeof (struct RecordSet);
 
  ec = GNUNET_EC_NONE;
  lctx.only_tombstone = GNUNET_NO;
  lctx.exp = GNUNET_TIME_UNIT_ZERO_ABS;
  new_block_exp = GNUNET_TIME_UNIT_ZERO_ABS;
  name_len = ntohs (rd_set->name_len);
  *len += name_len;
  rd_count = ntohs (rd_set->rd_count);
  rd_ser_len = ntohs (rd_set->rd_len);
  *len += rd_ser_len;
  name_tmp = (const char *) &rd_set[1];
  rd_ser = &name_tmp[name_len];
  {
    struct GNUNET_GNSRECORD_Data rd[GNUNET_NZL (rd_count)];
 
    /* Extracting and converting private key */
    conv_name = GNUNET_GNSRECORD_string_normalize (name_tmp);
    if (NULL == conv_name)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Error normalizing name `%s'\n",
                  name_tmp);
      return GNUNET_EC_NAMESTORE_LABEL_INVALID;
    }
 
    /* Check name for validity */
    if (GNUNET_OK != GNUNET_GNSRECORD_label_check (conv_name, &emsg))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Label invalid: `%s'\n",
                  emsg);
      GNUNET_free (emsg);
      GNUNET_free (conv_name);
      return GNUNET_EC_NAMESTORE_LABEL_INVALID;
    }
 
    if (GNUNET_OK !=
        GNUNET_GNSRECORD_records_deserialize (rd_ser_len, rd_ser, rd_count,
                                              rd))
    {
      GNUNET_free (conv_name);
      return GNUNET_EC_NAMESTORE_RECORD_DATA_INVALID;
    }
 
    GNUNET_STATISTICS_update (statistics,
                              "Well-formed store requests received",
                              1,
                              GNUNET_NO);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Creating %u records for name `%s'\n",
                (unsigned int) rd_count,
                conv_name);
    if ((GNUNET_NO == nc->GSN_database->lookup_records (nc->GSN_database->cls,
                                                        private_key,
                                                        conv_name,
                                                        &get_existing_rd_exp,
                                                        &lctx))
        &&
        (rd_count == 0))
    {
      /* This name does not exist, so cannot be removed */
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Name `%s' does not exist, no deletion required\n",
                  conv_name);
      res = GNUNET_NO;
      ec = GNUNET_EC_NAMESTORE_RECORD_NOT_FOUND;
    }
    else
    {
      /* remove "NICK" records, unless this is for the
       #GNUNET_GNS_EMPTY_LABEL_AT label
       We may need one additional record later for tombstone.
       FIXME: Since we must normalize the record set (check for
       consistency etc) we have to iterate the set twice.
       May be inefficient.
       We cannot really move the nick caching into GNSRECORD.
       */
      struct GNUNET_GNSRECORD_Data rd_clean[GNUNET_NZL (rd_count)];
      struct GNUNET_GNSRECORD_Data rd_nf[GNUNET_NZL (rd_count) + 1];
      unsigned int rd_clean_off;
      unsigned int rd_nf_count;
      int have_nick;
 
      rd_clean_off = 0;
      have_nick = GNUNET_NO;
      for (unsigned int i = 0; i < rd_count; i++)
      {
        rd_clean[rd_clean_off] = rd[i];
 
        if ((0 == strcmp (GNUNET_GNS_EMPTY_LABEL_AT, conv_name)) ||
            (GNUNET_GNSRECORD_TYPE_NICK != rd[i].record_type))
          rd_clean_off++;
 
        if ((0 == strcmp (GNUNET_GNS_EMPTY_LABEL_AT, conv_name)) &&
            (GNUNET_GNSRECORD_TYPE_NICK == rd[i].record_type))
        {
          // FIXME: In case this is an uncommited transaction,
          // we should not do this here. Can we do this in the store activity?
          cache_nick (private_key, &rd[i]);
          have_nick = GNUNET_YES;
        }
      }
      if (GNUNET_OK !=
          GNUNET_GNSRECORD_normalize_record_set (conv_name,
                                                 rd_clean,
                                                 rd_clean_off,
                                                 rd_nf,
                                                 &rd_nf_count,
                                                 &new_block_exp,
                                                 GNUNET_GNSRECORD_FILTER_NONE,
                                                 &emsg))
      {
        GNUNET_free (conv_name);
        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                    "Error normalizing record set: `%s'\n",
                    emsg);
        GNUNET_free (emsg);
        return GNUNET_EC_NAMESTORE_RECORD_DATA_INVALID;
      }
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "%u/%u records before tombstone\n", rd_nf_count,
                  rd_clean_off);
      /*
       * If existing_block_exp is 0, then there was no record set
       * and no tombstone.
       * Otherwise, if the existing block expiration is after the
       * new block expiration would be, we need to add a tombstone
       * or update it.
       */
      if (GNUNET_TIME_absolute_cmp (new_block_exp, <=, lctx.exp))
      {
        rd_nf[rd_nf_count].record_type = GNUNET_GNSRECORD_TYPE_TOMBSTONE;
        rd_nf[rd_nf_count].expiration_time =
          lctx.exp.abs_value_us;
        rd_nf[rd_nf_count].data = NULL;
        rd_nf[rd_nf_count].data_size = 0;
        rd_nf[rd_nf_count].flags = GNUNET_GNSRECORD_RF_PRIVATE;
        rd_nf_count++;
      }
      if ((0 == strcmp (GNUNET_GNS_EMPTY_LABEL_AT, conv_name)) &&
          (GNUNET_NO == have_nick))
      {
        /* remove nick record from cache, in case we have one there */
        // FIXME: In case this is an uncommited transaction,
        // we should not do this here. Can we do this in the store activity?
        cache_nick (private_key, NULL);
      }
      res = nc->GSN_database->store_records (nc->GSN_database->cls,
                                             private_key,
                                             conv_name,
                                             rd_nf_count,
                                             rd_nf);
      /* If after a store there is only a TOMBSTONE left, and
       * there was >1 record under this label found (the tombstone; indicated
       * through res != GNUNET_NO) then we should return "NOT FOUND" == GNUNET_NO
       */
      if ((GNUNET_SYSERR != res) &&
          (0 == rd_count) &&
          (1 == rd_nf_count) &&
          (GNUNET_GNSRECORD_TYPE_TOMBSTONE == rd_nf[0].record_type) &&
          (GNUNET_YES == lctx.only_tombstone))
      {
        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                    "Client tried to remove non-existant record\n");
        ec = GNUNET_EC_NAMESTORE_RECORD_NOT_FOUND;
      }
    }
 
    if (GNUNET_SYSERR == res)
    {
      /* store not successful, no need to tell monitors */
      GNUNET_free (conv_name);
      return GNUNET_EC_NAMESTORE_STORE_FAILED;
    }
  }
  GNUNET_free (conv_name);
  return ec;
}

Referenced by handle_record_store().

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handle_record_store()

static void handle_record_store ( void *  cls, const struct RecordStoreMessage *  rp_msg  )

static

Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE message.

Parameters

cls	client sending the message
rp_msg	message of type struct RecordStoreMessage

Definition at line 1728 of file gnunet-service-namestore.c.

{
  struct GNUNET_IDENTITY_PrivateKey zone;
  struct NamestoreClient *nc = cls;
  uint32_t rid;
  uint16_t rd_set_count;
  const char *buf;
  ssize_t read;
  size_t key_len;
  size_t kb_read;
  size_t rp_msg_len;
  size_t rs_len;
  size_t rs_off;
  size_t body_len;
  struct StoreActivity *sa;
  struct RecordSet *rs;
  enum GNUNET_ErrorCode res;
 
  key_len = ntohs (rp_msg->key_len);
  rp_msg_len = ntohs (rp_msg->gns_header.header.size);
  body_len = rp_msg_len - sizeof (*rp_msg);
  rs_off = sizeof (*rp_msg) + key_len;
  rs_len = rp_msg_len - rs_off;
  if ((GNUNET_SYSERR ==
       GNUNET_IDENTITY_read_private_key_from_buffer (&rp_msg[1],
                                                     key_len,
                                                     &zone,
                                                     &kb_read)) ||
      (kb_read != key_len))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Error reading private key\n");
    GNUNET_SERVICE_client_drop (nc->client);
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received NAMESTORE_RECORD_STORE message\n");
  rid = ntohl (rp_msg->gns_header.r_id);
  rd_set_count = ntohs (rp_msg->rd_set_count);
  buf = (const char *) rp_msg + rs_off;
  for (int i = 0; i < rd_set_count; i++)
  {
    rs = (struct RecordSet *) buf;
    res = store_record_set (nc, &zone,
                            rs, &read);
    if (GNUNET_EC_NONE != res)
    {
      send_store_response (nc, res, rid);
      GNUNET_SERVICE_client_continue (nc->client);
      return;
    }
    buf += read;
  }
  sa = GNUNET_malloc (sizeof(struct StoreActivity) + rs_len);
  GNUNET_CONTAINER_DLL_insert (sa_head, sa_tail, sa);
  sa->nc = nc;
  sa->rs = (struct RecordSet *) &sa[1];
  sa->rd_set_count = rd_set_count;
  GNUNET_memcpy (&sa[1], (char *) rp_msg + rs_off, rs_len);
  sa->rid = rid;
  sa->rd_set_pos = 0;
  sa->private_key = zone;
  sa->zm_pos = monitor_head;
  sa->uncommited = nc->in_transaction;
  continue_store_activity (sa, GNUNET_YES);
}

References buf, continue_store_activity(), RecordStoreMessage::gns_header, GNUNET_CONTAINER_DLL_insert, GNUNET_EC_NONE, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_IDENTITY_read_private_key_from_buffer(), GNUNET_log, GNUNET_malloc, GNUNET_memcpy, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), GNUNET_SYSERR, GNUNET_YES, GNUNET_NAMESTORE_Header::header, RecordStoreMessage::key_len, monitor_head, nc, StoreActivity::nc, StoreActivity::private_key, GNUNET_NAMESTORE_Header::r_id, StoreActivity::rd_set_count, RecordStoreMessage::rd_set_count, StoreActivity::rd_set_pos, res, StoreActivity::rid, StoreActivity::rs, sa_head, sa_tail, send_store_response(), GNUNET_MessageHeader::size, store_record_set(), StoreActivity::uncommited, StoreActivity::zm_pos, and zone.

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send_tx_response()

static void send_tx_response ( int  rid, enum GNUNET_ErrorCode  ec, struct NamestoreClient *  nc  )

static

Definition at line 1796 of file gnunet-service-namestore.c.

{
  struct TxControlResultMessage *txr_msg;
  struct GNUNET_MQ_Envelope *env;
 
  env =
    GNUNET_MQ_msg (txr_msg, GNUNET_MESSAGE_TYPE_NAMESTORE_TX_CONTROL_RESULT);
  txr_msg->gns_header.r_id = rid;
  txr_msg->ec = htonl (ec);
  GNUNET_MQ_send (nc->mq, env);
}

References TxControlResultMessage::ec, env, TxControlResultMessage::gns_header, GNUNET_MESSAGE_TYPE_NAMESTORE_TX_CONTROL_RESULT, GNUNET_MQ_msg, GNUNET_MQ_send(), GNUNET_PEERINFO_NotifyContext::mq, nc, and GNUNET_NAMESTORE_Header::r_id.

Referenced by handle_tx_control().

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handle_tx_control()

static void handle_tx_control ( void *  cls, const struct TxControlMessage *  tx_msg  )

static

Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_TX_CONTROL message.

Parameters

cls	client sending the message
tx_msg	message of type struct TxControlMessage

Definition at line 1815 of file gnunet-service-namestore.c.

{
  struct NamestoreClient *nc = cls;
  struct StoreActivity *sa = sa_head;
  struct StoreActivity *sn;
  enum GNUNET_GenericReturnValue ret;
  char *emsg = NULL;
  int blocked = GNUNET_NO;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received TX_CONTROL message\n");
 
  switch (ntohs (tx_msg->control))
  {
  case GNUNET_NAMESTORE_TX_BEGIN:
    ret = nc->GSN_database->transaction_begin (nc->GSN_database->cls,
                                               &emsg);
    send_tx_response (tx_msg->gns_header.r_id,
                      (GNUNET_SYSERR == ret) ?
                      GNUNET_EC_NAMESTORE_BACKEND_FAILED : GNUNET_EC_NONE, nc);
    if (GNUNET_SYSERR == ret)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Databse backend error: `%s'", emsg);
      GNUNET_free (emsg);
    }
    GNUNET_SERVICE_client_continue (nc->client);
    nc->in_transaction = GNUNET_YES;
    break;
  case GNUNET_NAMESTORE_TX_COMMIT:
    ret = nc->GSN_database->transaction_commit (nc->GSN_database->cls,
                                                &emsg);
    send_tx_response (tx_msg->gns_header.r_id,
                      (GNUNET_SYSERR == ret) ?
                      GNUNET_EC_NAMESTORE_BACKEND_FAILED : GNUNET_EC_NONE,
                      nc);
    if (GNUNET_SYSERR == ret)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Databse backend error: `%s'", emsg);
      GNUNET_free (emsg);
    }
    if (GNUNET_SYSERR != ret)
    {
      nc->in_transaction = GNUNET_NO;
      while (NULL != sa)
      {
        if ((nc != sa->nc) ||
            (GNUNET_NO == sa->uncommited))
        {
          sa = sa->next;
          continue;
        }
        sa->uncommited = GNUNET_NO;
        sn = sa->next;
        if (GNUNET_OK != continue_store_activity (sa, GNUNET_NO))
          blocked = GNUNET_YES;
        sa = sn;
      }
      if (GNUNET_YES != blocked)
        GNUNET_SERVICE_client_continue (nc->client);
    }
    break;
  case GNUNET_NAMESTORE_TX_ROLLBACK:
    ret = nc->GSN_database->transaction_rollback (nc->GSN_database->cls,
                                                  &emsg);
    send_tx_response (tx_msg->gns_header.r_id,
                      (GNUNET_SYSERR == ret) ?
                      GNUNET_EC_NAMESTORE_BACKEND_FAILED : GNUNET_EC_NONE, nc);
    GNUNET_SERVICE_client_continue (nc->client);
    if (GNUNET_SYSERR == ret)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Databse backend error: `%s'", emsg);
      GNUNET_free (emsg);
    }
    if (GNUNET_SYSERR != ret)
    {
      nc->in_transaction = GNUNET_NO;
      while (NULL != sa)
      {
        if ((nc != sa->nc) ||
            (GNUNET_NO == sa->uncommited))
        {
          sa = sa->next;
          continue;
        }
        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                    "Discarding uncommited StoreActivity\n");
        sn = sa->next;
        free_store_activity (sa);
        sa = sn;
      }
    }
    break;
  default:
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "Unknown control type %u\n", ntohs (tx_msg->control));
    GNUNET_break (0);
  }
}

References continue_store_activity(), TxControlMessage::control, free_store_activity(), TxControlMessage::gns_header, GNUNET_break, GNUNET_EC_NAMESTORE_BACKEND_FAILED, GNUNET_EC_NONE, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_NAMESTORE_TX_BEGIN, GNUNET_NAMESTORE_TX_COMMIT, GNUNET_NAMESTORE_TX_ROLLBACK, GNUNET_NO, GNUNET_OK, GNUNET_SERVICE_client_continue(), GNUNET_SYSERR, GNUNET_YES, nc, StoreActivity::nc, StoreActivity::next, GNUNET_NAMESTORE_Header::r_id, ret, sa_head, send_tx_response(), and StoreActivity::uncommited.

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handle_zone_to_name_it()

static void handle_zone_to_name_it ( void *  cls, uint64_t  seq, const struct GNUNET_IDENTITY_PrivateKey *  zone_key, const char *  name, unsigned int  rd_count, const struct GNUNET_GNSRECORD_Data *  rd  )

static

Zone to name iterator.

Parameters

cls	struct ZoneToNameCtx *
seq	sequence number of the record, MUST NOT BE ZERO
zone_key	the zone key
name	name
rd_count	number of records in rd
rd	record data

Definition at line 1952 of file gnunet-service-namestore.c.

{
  struct ZoneToNameCtx *ztn_ctx = cls;
  struct GNUNET_MQ_Envelope *env;
  struct ZoneToNameResponseMessage *ztnr_msg;
  size_t name_len;
  size_t key_len;
  ssize_t rd_ser_len;
  size_t msg_size;
  char *name_tmp;
  char *rd_tmp;
 
  GNUNET_assert (0 != seq);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Found result for zone-to-name lookup: `%s'\n",
              name);
  ztn_ctx->ec = GNUNET_EC_NONE;
  name_len = (NULL == name) ? 0 : strlen (name) + 1;
  rd_ser_len = GNUNET_GNSRECORD_records_get_size (rd_count, rd);
  if (rd_ser_len < 0)
  {
    GNUNET_break (0);
    ztn_ctx->ec = htonl (GNUNET_EC_NAMESTORE_UNKNOWN);
    return;
  }
  key_len = GNUNET_IDENTITY_private_key_get_length (zone_key);
  msg_size = sizeof(struct ZoneToNameResponseMessage)
             + name_len + rd_ser_len + key_len;
  if (msg_size >= GNUNET_MAX_MESSAGE_SIZE)
  {
    GNUNET_break (0);
    ztn_ctx->ec = GNUNET_EC_NAMESTORE_RECORD_TOO_BIG;
    return;
  }
  env =
    GNUNET_MQ_msg_extra (ztnr_msg,
                         key_len + name_len + rd_ser_len,
                         GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME_RESPONSE);
  ztnr_msg->gns_header.header.size = htons (msg_size);
  ztnr_msg->gns_header.r_id = htonl (ztn_ctx->rid);
  ztnr_msg->ec = htonl (ztn_ctx->ec);
  ztnr_msg->rd_len = htons (rd_ser_len);
  ztnr_msg->rd_count = htons (rd_count);
  ztnr_msg->name_len = htons (name_len);
  ztnr_msg->key_len = htons (key_len);
  GNUNET_IDENTITY_write_private_key_to_buffer (zone_key,
                                               &ztnr_msg[1],
                                               key_len);
  name_tmp = (char *) &ztnr_msg[1] + key_len;
  GNUNET_memcpy (name_tmp, name, name_len);
  rd_tmp = &name_tmp[name_len];
  GNUNET_assert (
    rd_ser_len ==
    GNUNET_GNSRECORD_records_serialize (rd_count, rd, rd_ser_len, rd_tmp));
  ztn_ctx->ec = GNUNET_EC_NONE;
  GNUNET_MQ_send (ztn_ctx->nc->mq, env);
}

Referenced by handle_zone_to_name().

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check_zone_to_name()

static enum GNUNET_GenericReturnValue check_zone_to_name ( void *  cls, const struct ZoneToNameMessage *  zis_msg  )

static

Definition at line 1952 of file gnunet-service-namestore.c.

{
  return GNUNET_OK;
}

References ZoneToNameCtx::ec, ZoneToNameResponseMessage::ec, env, ZoneToNameResponseMessage::gns_header, GNUNET_assert, GNUNET_break, GNUNET_EC_NAMESTORE_RECORD_TOO_BIG, GNUNET_EC_NAMESTORE_UNKNOWN, GNUNET_EC_NONE, GNUNET_ERROR_TYPE_DEBUG, GNUNET_GNSRECORD_records_get_size(), GNUNET_GNSRECORD_records_serialize(), GNUNET_IDENTITY_private_key_get_length(), GNUNET_IDENTITY_write_private_key_to_buffer(), GNUNET_log, GNUNET_MAX_MESSAGE_SIZE, GNUNET_memcpy, GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME_RESPONSE, GNUNET_MQ_msg_extra, GNUNET_MQ_send(), GNUNET_NAMESTORE_Header::header, ZoneToNameResponseMessage::key_len, NamestoreClient::mq, name, ZoneToNameResponseMessage::name_len, ZoneToNameCtx::nc, GNUNET_NAMESTORE_Header::r_id, rd, rd_count, ZoneToNameResponseMessage::rd_count, ZoneToNameResponseMessage::rd_len, ZoneToNameCtx::rid, GNUNET_MessageHeader::size, and zone_key.

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handle_zone_to_name()

static void handle_zone_to_name ( void *  cls, const struct ZoneToNameMessage *  ztn_msg  )

static

Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME message.

Parameters

cls	client client sending the message
ztn_msg	message of type 'struct ZoneToNameMessage'

Definition at line 2030 of file gnunet-service-namestore.c.

{
  struct GNUNET_IDENTITY_PrivateKey zone;
  struct GNUNET_IDENTITY_PublicKey value_zone;
  struct NamestoreClient *nc = cls;
  struct ZoneToNameCtx ztn_ctx;
  struct GNUNET_MQ_Envelope *env;
  struct ZoneToNameResponseMessage *ztnr_msg;
  size_t key_len;
  size_t pkey_len;
  size_t kb_read;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received ZONE_TO_NAME message\n");
  ztn_ctx.rid = ntohl (ztn_msg->gns_header.r_id);
  ztn_ctx.nc = nc;
  ztn_ctx.ec = GNUNET_EC_NAMESTORE_ZONE_NOT_FOUND;
  key_len = ntohs (ztn_msg->key_len);
  if ((GNUNET_SYSERR ==
       GNUNET_IDENTITY_read_private_key_from_buffer (&ztn_msg[1],
                                                     key_len,
                                                     &zone,
                                                     &kb_read)) ||
      (kb_read != key_len))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Error parsing private key.\n");
    GNUNET_SERVICE_client_drop (nc->client);
    GNUNET_break (0);
    return;
  }
  pkey_len = ntohs (ztn_msg->pkey_len);
  if ((GNUNET_SYSERR ==
       GNUNET_IDENTITY_read_public_key_from_buffer ((char*) &ztn_msg[1]
                                                    + key_len,
                                                    pkey_len,
                                                    &value_zone,
                                                    &kb_read)) ||
      (kb_read != pkey_len))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Error parsing public key.\n");
    GNUNET_SERVICE_client_drop (nc->client);
    GNUNET_break (0);
    return;
  }
  if (GNUNET_SYSERR == nc->GSN_database->zone_to_name (nc->GSN_database->cls,
                                                       &zone,
                                                       &value_zone,
                                                       &handle_zone_to_name_it,
                                                       &ztn_ctx))
  {
    /* internal error, hang up instead of signalling something
       that might be wrong */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (nc->client);
    return;
  }
  if (GNUNET_EC_NAMESTORE_ZONE_NOT_FOUND == ztn_ctx.ec)
  {
    /* no result found, send empty response */
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Found no result for zone-to-name lookup.\n");
    env = GNUNET_MQ_msg (ztnr_msg,
                         GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME_RESPONSE);
    ztnr_msg->gns_header.r_id = ztn_msg->gns_header.r_id;
    ztnr_msg->ec = htonl (GNUNET_EC_NAMESTORE_ZONE_NOT_FOUND);
    GNUNET_MQ_send (nc->mq, env);
  }
  GNUNET_SERVICE_client_continue (nc->client);
}

References ZoneToNameCtx::ec, ZoneToNameResponseMessage::ec, env, ZoneToNameMessage::gns_header, ZoneToNameResponseMessage::gns_header, GNUNET_break, GNUNET_EC_NAMESTORE_ZONE_NOT_FOUND, GNUNET_ERROR_TYPE_DEBUG, GNUNET_IDENTITY_read_private_key_from_buffer(), GNUNET_IDENTITY_read_public_key_from_buffer(), GNUNET_log, GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME_RESPONSE, GNUNET_MQ_msg, GNUNET_MQ_send(), GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), GNUNET_SYSERR, handle_zone_to_name_it(), ZoneToNameMessage::key_len, ZoneToNameResponseMessage::key_len, GNUNET_PEERINFO_NotifyContext::mq, nc, ZoneToNameCtx::nc, ZoneToNameMessage::pkey_len, GNUNET_NAMESTORE_Header::r_id, ZoneToNameCtx::rid, and zone.

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zone_iterate_proc()

static void zone_iterate_proc ( void *  cls, uint64_t  seq, const struct GNUNET_IDENTITY_PrivateKey *  zone_key, const char *  name, unsigned int  rd_count, const struct GNUNET_GNSRECORD_Data *  rd  )

static

Process results for zone iteration from database.

Parameters

cls	struct ZoneIterationProcResult
seq	sequence number of the record, MUST NOT BE ZERO
zone_key	the zone key
name	name
rd_count	number of records for this name
rd	record data

Definition at line 2136 of file gnunet-service-namestore.c.

{
  struct ZoneIterationProcResult *proc = cls;
 
  GNUNET_assert (0 != seq);
  if ((NULL == zone_key) && (NULL == name))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Iteration done\n");
    return;
  }
  if ((NULL == zone_key) || (NULL == name))
  {
    /* what is this!? should never happen */
    GNUNET_break (0);
    return;
  }
  if (0 == proc->limit)
  {
    /* what is this!? should never happen */
    GNUNET_break (0);
    return;
  }
  proc->zi->seq = seq;
  if (0 < send_lookup_response_with_filter (proc->zi->nc,
                                            proc->zi->request_id,
                                            zone_key,
                                            name,
                                            rd_count,
                                            rd,
                                            proc->zi->filter))
    proc->limit--;
  else
    proc->run_again = GNUNET_YES;
}

References ZoneIteration::filter, GNUNET_assert, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_YES, ZoneIterationProcResult::limit, name, ZoneIteration::nc, rd, rd_count, ZoneIteration::request_id, ZoneIterationProcResult::run_again, send_lookup_response_with_filter(), ZoneIteration::seq, ZoneIterationProcResult::zi, and zone_key.

Referenced by check_iteration_start().

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run_zone_iteration_round()

static void run_zone_iteration_round ( struct ZoneIteration *  zi, uint64_t  limit  )

static

Perform the next round of the zone iteration.

Parameters

zi	zone iterator to process
limit	number of results to return in one pass

Definition at line 2184 of file gnunet-service-namestore.c.

{
  struct ZoneIterationProcResult proc;
  struct GNUNET_TIME_Absolute start;
  struct GNUNET_TIME_Relative duration;
  struct NamestoreClient *nc = zi->nc;
 
  memset (&proc, 0, sizeof(proc));
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Asked to return up to %llu records at position %llu\n",
              (unsigned long long) limit,
              (unsigned long long) zi->seq);
  proc.zi = zi;
  proc.limit = limit;
  proc.run_again = GNUNET_YES;
  start = GNUNET_TIME_absolute_get ();
  while (GNUNET_YES == proc.run_again)
  {
    proc.run_again = GNUNET_NO;
    GNUNET_break (GNUNET_SYSERR !=
                  nc->GSN_database->iterate_records (nc->GSN_database->cls,
                                                     (GNUNET_YES ==
                                                      GNUNET_is_zero (
                                                        &zi->zone))
                                               ? NULL
                                               : &zi->zone,
                                                     zi->seq,
                                                     proc.limit,
                                                     &zone_iterate_proc,
                                                     &proc));
  }
  duration = GNUNET_TIME_absolute_get_duration (start);
  duration = GNUNET_TIME_relative_divide (duration, limit - proc.limit);
  GNUNET_STATISTICS_set (statistics,
                         "NAMESTORE iteration delay (μs/record)",
                         duration.rel_value_us,
                         GNUNET_NO);
  if (0 == proc.limit)
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Returned %llu results, more results available\n",
                (unsigned long long) limit);
  zi->send_end = (0 != proc.limit);
  if (0 == zi->cache_ops)
    zone_iteration_done_client_continue (zi);
}

Referenced by handle_iteration_next(), and handle_iteration_start().

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check_iteration_start()

static enum GNUNET_GenericReturnValue check_iteration_start ( void *  cls, const struct ZoneIterationStartMessage *  zis_msg  )

static

Definition at line 2184 of file gnunet-service-namestore.c.

{
  uint16_t size;
  size_t key_len;
 
  size = ntohs (zis_msg->gns_header.header.size);
  key_len = ntohs (zis_msg->key_len);
 
  if (size < key_len + sizeof(*zis_msg))
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  return GNUNET_OK;
}

References ZoneIteration::cache_ops, duration, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_is_zero, GNUNET_log, GNUNET_NO, GNUNET_STATISTICS_set(), GNUNET_SYSERR, GNUNET_TIME_absolute_get(), GNUNET_TIME_absolute_get_duration(), GNUNET_TIME_relative_divide(), GNUNET_YES, ZoneIterationProcResult::limit, nc, ZoneIteration::nc, GNUNET_TIME_Relative::rel_value_us, ZoneIterationProcResult::run_again, ZoneIteration::send_end, ZoneIteration::seq, start, statistics, ZoneIterationProcResult::zi, ZoneIteration::zone, zone_iterate_proc(), and zone_iteration_done_client_continue().

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handle_iteration_start()

static void handle_iteration_start ( void *  cls, const struct ZoneIterationStartMessage *  zis_msg  )

static

Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_START message.

Parameters

cls	the client sending the message
zis_msg	message from the client

Definition at line 2256 of file gnunet-service-namestore.c.

{
  struct GNUNET_IDENTITY_PrivateKey zone;
  struct NamestoreClient *nc = cls;
  struct ZoneIteration *zi;
  size_t key_len;
  size_t kb_read;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received ZONE_ITERATION_START message\n");
  key_len = ntohs (zis_msg->key_len);
  zi = GNUNET_new (struct ZoneIteration);
  if (0 < key_len)
  {
    if ((GNUNET_SYSERR ==
         GNUNET_IDENTITY_read_private_key_from_buffer (&zis_msg[1],
                                                       key_len,
                                                       &zone,
                                                       &kb_read)) ||
        (kb_read != key_len))
    {
      GNUNET_SERVICE_client_drop (nc->client);
      GNUNET_free (zi);
      return;
    }
    zi->zone = zone;
  }
  zi->request_id = ntohl (zis_msg->gns_header.r_id);
  zi->filter = ntohs (zis_msg->filter);
  zi->offset = 0;
  zi->nc = nc;
  GNUNET_CONTAINER_DLL_insert (nc->op_head, nc->op_tail, zi);
  run_zone_iteration_round (zi, 1);
}

References ZoneIteration::filter, ZoneIterationStartMessage::filter, ZoneIterationStartMessage::gns_header, GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_IDENTITY_read_private_key_from_buffer(), GNUNET_log, GNUNET_new, GNUNET_SERVICE_client_drop(), GNUNET_SYSERR, ZoneIterationStartMessage::key_len, nc, ZoneIteration::nc, ZoneIteration::offset, GNUNET_NAMESTORE_Header::r_id, ZoneIteration::request_id, run_zone_iteration_round(), zone, and ZoneIteration::zone.

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handle_iteration_stop()

static void handle_iteration_stop ( void *  cls, const struct ZoneIterationStopMessage *  zis_msg  )

static

Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_STOP message.

Parameters

cls	the client sending the message
zis_msg	message from the client

Definition at line 2300 of file gnunet-service-namestore.c.

{
  struct NamestoreClient *nc = cls;
  struct ZoneIteration *zi;
  uint32_t rid;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received ZONE_ITERATION_STOP message\n");
  rid = ntohl (zis_msg->gns_header.r_id);
  for (zi = nc->op_head; NULL != zi; zi = zi->next)
    if (zi->request_id == rid)
      break;
  if (NULL == zi)
  {
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (nc->client);
    return;
  }
  GNUNET_CONTAINER_DLL_remove (nc->op_head, nc->op_tail, zi);
  GNUNET_free (zi);
  GNUNET_SERVICE_client_continue (nc->client);
}

References ZoneIterationStopMessage::gns_header, GNUNET_break, GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), nc, ZoneIteration::next, GNUNET_NAMESTORE_Header::r_id, and ZoneIteration::request_id.

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handle_iteration_next()

static void handle_iteration_next ( void *  cls, const struct ZoneIterationNextMessage *  zis_msg  )

static

Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_NEXT message.

Parameters

cls	the client sending the message
zis_msg	message from the client

Definition at line 2332 of file gnunet-service-namestore.c.

{
  struct NamestoreClient *nc = cls;
  struct ZoneIteration *zi;
  uint32_t rid;
  uint64_t limit;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received ZONE_ITERATION_NEXT message\n");
  GNUNET_STATISTICS_update (statistics,
                            "Iteration NEXT messages received",
                            1,
                            GNUNET_NO);
  rid = ntohl (zis_msg->gns_header.r_id);
  limit = GNUNET_ntohll (zis_msg->limit);
  for (zi = nc->op_head; NULL != zi; zi = zi->next)
    if (zi->request_id == rid)
      break;
  if (NULL == zi)
  {
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (nc->client);
    return;
  }
  run_zone_iteration_round (zi, limit);
}

References ZoneIterationNextMessage::gns_header, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_NO, GNUNET_ntohll(), GNUNET_SERVICE_client_drop(), GNUNET_STATISTICS_update(), ZoneIterationNextMessage::limit, nc, ZoneIteration::next, GNUNET_NAMESTORE_Header::r_id, ZoneIteration::request_id, run_zone_iteration_round(), and statistics.

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monitor_unblock()

static void monitor_unblock ( struct ZoneMonitor *  zm )

static

Function called when the monitor is ready for more data, and we should thus unblock PUT operations that were blocked on the monitor not being ready.

Definition at line 2367 of file gnunet-service-namestore.c.

{
  struct StoreActivity *sa = sa_head;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Unblocking zone monitor %p\n", zm);
  while ((NULL != sa) && (zm->limit > zm->iteration_cnt))
  {
    struct StoreActivity *sn = sa->next;
 
    if (sa->zm_pos == zm)
      continue_store_activity (sa, GNUNET_YES);
    sa = sn;
  }
  if (zm->limit > zm->iteration_cnt)
  {
    zm->sa_waiting = GNUNET_NO;
    if (NULL != zm->sa_wait_warning)
    {
      GNUNET_SCHEDULER_cancel (zm->sa_wait_warning);
      zm->sa_wait_warning = NULL;
    }
  }
  else if (GNUNET_YES == zm->sa_waiting)
  {
    zm->sa_waiting_start = GNUNET_TIME_absolute_get ();
    if (NULL != zm->sa_wait_warning)
      GNUNET_SCHEDULER_cancel (zm->sa_wait_warning);
    zm->sa_wait_warning =
      GNUNET_SCHEDULER_add_delayed (MONITOR_STALL_WARN_DELAY,
                                    &warn_monitor_slow,
                                    zm);
  }
}

References continue_store_activity(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_NO, GNUNET_SCHEDULER_add_delayed(), GNUNET_SCHEDULER_cancel(), GNUNET_TIME_absolute_get(), GNUNET_YES, MONITOR_STALL_WARN_DELAY, StoreActivity::next, sa_head, warn_monitor_slow(), zm, and StoreActivity::zm_pos.

Referenced by handle_monitor_next(), and monitor_sync().

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monitor_sync()

static void monitor_sync ( struct ZoneMonitor *  zm )

static

Send 'sync' message to zone monitor, we're now in sync.

Parameters

zm	monitor that is now in sync

Definition at line 2409 of file gnunet-service-namestore.c.

{
  struct GNUNET_MQ_Envelope *env;
  struct GNUNET_MessageHeader *sync;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Synching zone monitor %p\n", zm);
 
  env = GNUNET_MQ_msg (sync, GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_SYNC);
  GNUNET_MQ_send (zm->nc->mq, env);
  /* mark iteration done */
  zm->in_first_iteration = GNUNET_NO;
  zm->iteration_cnt = 0;
  if ((zm->limit > 0) && (zm->sa_waiting))
    monitor_unblock (zm);
}

References env, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_SYNC, GNUNET_MQ_msg, GNUNET_MQ_send(), GNUNET_NO, monitor_unblock(), GNUNET_NAMESTORE_ZoneMonitor::mq, and zm.

Referenced by handle_monitor_start(), and monitor_iteration_next().

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monitor_iteration_next()

static void monitor_iteration_next ( void *  cls )

static

Obtain the next datum during the zone monitor's zone initial iteration.

Parameters

cls	zone monitor that does its initial iteration

Definition at line 2558 of file gnunet-service-namestore.c.

{
  struct ZoneMonitor *zm = cls;
  struct NamestoreClient *nc = zm->nc;
  int ret;
 
  zm->task = NULL;
  GNUNET_assert (0 == zm->iteration_cnt);
  if (zm->limit > 16)
    zm->iteration_cnt = zm->limit / 2;   /* leave half for monitor events */
  else
    zm->iteration_cnt = zm->limit;   /* use it all */
  zm->run_again = GNUNET_YES;
  while (GNUNET_YES == zm->run_again)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Running iteration\n");
    zm->run_again = GNUNET_NO;
    ret = nc->GSN_database->iterate_records (nc->GSN_database->cls,
                                             (GNUNET_YES == GNUNET_is_zero (
                                                &zm->zone)) ? NULL : &zm->zone,
                                             zm->seq,
                                             zm->iteration_cnt,
                                             &monitor_iterate_cb,
                                             zm);
  }
  if (GNUNET_SYSERR == ret)
  {
    GNUNET_SERVICE_client_drop (zm->nc->client);
    return;
  }
  if (GNUNET_NO == ret)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Zone empty... syncing\n");
    /* empty zone */
    monitor_sync (zm);
    return;
  }
}

References GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_is_zero, GNUNET_log, GNUNET_NO, GNUNET_SERVICE_client_drop(), GNUNET_SYSERR, GNUNET_YES, monitor_iterate_cb(), monitor_sync(), nc, ret, zm, and GNUNET_NAMESTORE_ZoneMonitor::zone.

Referenced by check_monitor_start(), handle_monitor_next(), and handle_monitor_start().

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monitor_iterate_cb()

static void monitor_iterate_cb ( void *  cls, uint64_t  seq, const struct GNUNET_IDENTITY_PrivateKey *  zone_key, const char *  name, unsigned int  rd_count, const struct GNUNET_GNSRECORD_Data *  rd  )

static

A GNUNET_NAMESTORE_RecordIterator for monitors.

Parameters

cls	a 'struct ZoneMonitor *' with information about the monitor
seq	sequence number of the record, MUST NOT BE ZERO
zone_key	zone key of the zone
name	name
rd_count	number of records in rd
rd	array of records

Definition at line 2446 of file gnunet-service-namestore.c.

{
  struct ZoneMonitor *zm = cls;
 
  GNUNET_assert (0 != seq);
  zm->seq = seq;
  GNUNET_assert (NULL != name);
  GNUNET_STATISTICS_update (statistics,
                            "Monitor notifications sent",
                            1,
                            GNUNET_NO);
  if (0 < send_lookup_response_with_filter (zm->nc, 0, zone_key, name,
                                            rd_count, rd, zm->filter))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Sent records.\n");
    zm->limit--;
    zm->iteration_cnt--;
  }
  else
    zm->run_again = GNUNET_YES;
  if ((0 == zm->iteration_cnt) && (0 != zm->limit))
  {
    /* We are done with the current iteration batch, AND the
       client would right now accept more, so go again! */
    GNUNET_assert (NULL == zm->task);
    zm->task = GNUNET_SCHEDULER_add_now (&monitor_iteration_next, zm);
  }
}

Referenced by monitor_iteration_next().

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check_monitor_start()

static enum GNUNET_GenericReturnValue check_monitor_start ( void *  cls, const struct ZoneMonitorStartMessage *  zis_msg  )

static

Definition at line 2446 of file gnunet-service-namestore.c.

{
  uint16_t size;
  size_t key_len;
 
  size = ntohs (zis_msg->header.size);
  key_len = ntohs (zis_msg->key_len);
 
  if (size < key_len + sizeof(*zis_msg))
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  return GNUNET_OK;
}

References GNUNET_NAMESTORE_ZoneMonitor::filter, GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_NO, GNUNET_SCHEDULER_add_now(), GNUNET_STATISTICS_update(), GNUNET_YES, monitor_iteration_next(), name, rd, rd_count, send_lookup_response_with_filter(), ZoneMonitor::seq, statistics, zm, and zone_key.

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handle_monitor_start()

static void handle_monitor_start ( void *  cls, const struct ZoneMonitorStartMessage *  zis_msg  )

static

Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_START message.

Parameters

cls	the client sending the message
zis_msg	message from the client

Definition at line 2507 of file gnunet-service-namestore.c.

{
  struct GNUNET_IDENTITY_PrivateKey zone;
  struct NamestoreClient *nc = cls;
  struct ZoneMonitor *zm;
  size_t key_len;
  size_t kb_read;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received ZONE_MONITOR_START message\n");
  zm = GNUNET_new (struct ZoneMonitor);
  zm->nc = nc;
  key_len = ntohs (zis_msg->key_len);
  if (0 < key_len)
  {
    if ((GNUNET_SYSERR ==
         GNUNET_IDENTITY_read_private_key_from_buffer (&zis_msg[1],
                                                       key_len,
                                                       &zone,
                                                       &kb_read)) ||
        (kb_read != key_len))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Error reading private key\n");
      GNUNET_SERVICE_client_drop (nc->client);
      GNUNET_free (zm);
      return;
    }
    zm->zone = zone;
  }
  zm->limit = 1;
  zm->filter = ntohs (zis_msg->filter);
  zm->in_first_iteration = (GNUNET_YES == ntohl (zis_msg->iterate_first));
  GNUNET_CONTAINER_DLL_insert (monitor_head, monitor_tail, zm);
  GNUNET_SERVICE_client_mark_monitor (nc->client);
  GNUNET_SERVICE_client_continue (nc->client);
  GNUNET_notification_context_add (monitor_nc, nc->mq);
  if (zm->in_first_iteration)
    zm->task = GNUNET_SCHEDULER_add_now (&monitor_iteration_next, zm);
  else
    monitor_sync (zm);
}

References ZoneMonitorStartMessage::filter, GNUNET_NAMESTORE_ZoneMonitor::filter, GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_IDENTITY_read_private_key_from_buffer(), GNUNET_log, GNUNET_new, GNUNET_notification_context_add(), GNUNET_SCHEDULER_add_now(), GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), GNUNET_SERVICE_client_mark_monitor(), GNUNET_SYSERR, GNUNET_YES, ZoneMonitorStartMessage::iterate_first, ZoneMonitorStartMessage::key_len, monitor_head, monitor_iteration_next(), monitor_nc, monitor_sync(), monitor_tail, GNUNET_PEERINFO_NotifyContext::mq, nc, zm, zone, and GNUNET_NAMESTORE_ZoneMonitor::zone.

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handle_monitor_next()

static void handle_monitor_next ( void *  cls, const struct ZoneMonitorNextMessage *  nm  )

static

Handles a GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_NEXT message.

Parameters

cls	the client sending the message
nm	message from the client

Definition at line 2606 of file gnunet-service-namestore.c.

{
  struct NamestoreClient *nc = cls;
  struct ZoneMonitor *zm;
  uint64_t inc;
 
  inc = GNUNET_ntohll (nm->limit);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received ZONE_MONITOR_NEXT message with limit %llu\n",
              (unsigned long long) inc);
  for (zm = monitor_head; NULL != zm; zm = zm->next)
    if (zm->nc == nc)
      break;
  if (NULL == zm)
  {
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (nc->client);
    return;
  }
  GNUNET_SERVICE_client_continue (nc->client);
  if (zm->limit + inc < zm->limit)
  {
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (nc->client);
    return;
  }
  zm->limit += inc;
  if ((zm->in_first_iteration) && (zm->limit == inc))
  {
    /* We are still iterating, and the previous iteration must
       have stopped due to the client's limit, so continue it! */
    GNUNET_assert (NULL == zm->task);
    zm->task = GNUNET_SCHEDULER_add_now (&monitor_iteration_next, zm);
  }
  GNUNET_assert (zm->iteration_cnt <= zm->limit);
  if ((zm->limit > zm->iteration_cnt) && (zm->sa_waiting))
  {
    monitor_unblock (zm);
  }
  else if (GNUNET_YES == zm->sa_waiting)
  {
    if (NULL != zm->sa_wait_warning)
      GNUNET_SCHEDULER_cancel (zm->sa_wait_warning);
    zm->sa_waiting_start = GNUNET_TIME_absolute_get ();
    zm->sa_wait_warning =
      GNUNET_SCHEDULER_add_delayed (MONITOR_STALL_WARN_DELAY,
                                    &warn_monitor_slow,
                                    zm);
  }
}

References GNUNET_assert, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_ntohll(), GNUNET_SCHEDULER_add_delayed(), GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), GNUNET_TIME_absolute_get(), GNUNET_YES, ZoneMonitor::limit, ZoneMonitorNextMessage::limit, monitor_head, monitor_iteration_next(), MONITOR_STALL_WARN_DELAY, monitor_unblock(), nc, warn_monitor_slow(), and zm.

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run()

static void run ( void *  cls, const struct GNUNET_CONFIGURATION_Handle *  cfg, struct GNUNET_SERVICE_Handle *  service  )

static

Process namestore requests.

Parameters

cls	closure
cfg	configuration to use
service	the initialized service

Definition at line 2665 of file gnunet-service-namestore.c.

{
  char *database;
  (void) cls;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Starting namestore service\n");
  return_orphaned = GNUNET_CONFIGURATION_get_value_yesno (cfg,
                                                          "namestore",
                                                          "RETURN_ORPHANED");
  GSN_cfg = cfg;
  monitor_nc = GNUNET_notification_context_create (1);
  statistics = GNUNET_STATISTICS_create ("namestore", cfg);
  /* Loading database plugin */
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg,
                                                          "namestore",
                                                          "database",
                                                          &database))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No database backend configured\n");
    GNUNET_SCHEDULER_add_now (&cleanup_task, NULL);
    return;
  }
  GNUNET_asprintf (&db_lib_name, "libgnunet_plugin_namestore_%s", database);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Loading %s\n", db_lib_name);
  GSN_database = GNUNET_PLUGIN_load (db_lib_name, (void *) cfg);
  GNUNET_free (database);
  if (NULL == GSN_database)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Could not load database backend `%s'\n",
                db_lib_name);
    GNUNET_free (db_lib_name);
    GNUNET_SCHEDULER_add_now (&cleanup_task, NULL);
    return;
  }
  GNUNET_SCHEDULER_add_shutdown (&cleanup_task, NULL);
}

References cfg, cleanup_task(), db_lib_name, GNUNET_asprintf(), GNUNET_CONFIGURATION_get_value_string(), GNUNET_CONFIGURATION_get_value_yesno(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_notification_context_create(), GNUNET_OK, GNUNET_PLUGIN_load(), GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_add_shutdown(), GNUNET_STATISTICS_create(), GSN_cfg, GSN_database, monitor_nc, return_orphaned, and statistics.

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GNUNET_SERVICE_MAIN()

GNUNET_SERVICE_MAIN	(	"namestore"	,
		GNUNET_SERVICE_OPTION_NONE	,
		&	run,
		&	client_connect_cb,
		&	client_disconnect_cb,
		NULL	,
		GNUNET_MQ_hd_fixed_size(tx_control, GNUNET_MESSAGE_TYPE_NAMESTORE_TX_CONTROL, struct TxControlMessage, NULL)	,
		GNUNET_MQ_hd_var_size(record_store, GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE, struct RecordStoreMessage, NULL)	,
		GNUNET_MQ_hd_var_size(record_lookup, GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_LOOKUP, struct LabelLookupMessage, NULL)	,
		GNUNET_MQ_hd_var_size(zone_to_name, GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME, struct ZoneToNameMessage, NULL)	,
		GNUNET_MQ_hd_var_size(iteration_start, GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_START, struct ZoneIterationStartMessage, NULL)	,
		GNUNET_MQ_hd_fixed_size(iteration_next, GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_NEXT, struct ZoneIterationNextMessage, NULL)	,
		GNUNET_MQ_hd_fixed_size(iteration_stop, GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_STOP, struct ZoneIterationStopMessage, NULL)	,
		GNUNET_MQ_hd_var_size(monitor_start, GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_START, struct ZoneMonitorStartMessage, NULL)	,
		GNUNET_MQ_hd_fixed_size(monitor_next, GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_NEXT, struct ZoneMonitorNextMessage, NULL)	,
		GNUNET_MQ_handler_end()
	)

Define "main" method using service macro.

Variable Documentation

nick_cache

struct NickCache nick_cache[16]

static

We cache nick records to reduce DB load.

Definition at line 1 of file gnunet-service-namestore.c.

Referenced by cache_nick(), and get_nick_record().

zero

const struct GNUNET_IDENTITY_PrivateKey zero

static

Public key of all zeros.

Definition at line 1 of file gnunet-service-namestore.c.

Referenced by check_ipv6_listed(), continue_store_activity(), create_message_request(), GNUNET_CRYPTO_edx25519_private_key_derive(), GNUNET_DHT_verify_path(), GNUNET_TUN_ipv6policy2regex(), and GST_manipulation_set_metric().

GSN_cfg

const struct GNUNET_CONFIGURATION_Handle* GSN_cfg

static

Configuration handle.

Definition at line 355 of file gnunet-service-namestore.c.

Referenced by client_connect_cb(), and run().

statistics

struct GNUNET_STATISTICS_Handle* statistics

static

Handle to the statistics service.

Definition at line 360 of file gnunet-service-namestore.c.

Referenced by check_iteration_start(), check_monitor_start(), cleanup_task(), handle_iteration_next(), run(), send_lookup_response_with_filter(), and send_store_response().

db_lib_name

char* db_lib_name

static

Name of the database plugin.

Definition at line 365 of file gnunet-service-namestore.c.

Referenced by cleanup_task(), client_connect_cb(), and run().

GSN_database

struct GNUNET_NAMESTORE_PluginFunctions* GSN_database

Database handle for service.

Definition at line 370 of file gnunet-service-namestore.c.

Referenced by cleanup_task(), get_nick_record(), and run().

monitor_head

struct ZoneMonitor* monitor_head

static

First active zone monitor.

Definition at line 376 of file gnunet-service-namestore.c.

Referenced by client_disconnect_cb(), handle_monitor_next(), handle_monitor_start(), and handle_record_store().

monitor_tail

struct ZoneMonitor* monitor_tail

static

Last active zone monitor.

Definition at line 381 of file gnunet-service-namestore.c.

Referenced by client_disconnect_cb(), and handle_monitor_start().

sa_head

struct StoreActivity* sa_head

static

Head of DLL of monitor-blocked store activities.

Definition at line 386 of file gnunet-service-namestore.c.

Referenced by client_disconnect_cb(), free_store_activity(), handle_record_store(), handle_tx_control(), and monitor_unblock().

sa_tail

struct StoreActivity* sa_tail

static

Tail of DLL of monitor-blocked store activities.

Definition at line 391 of file gnunet-service-namestore.c.

Referenced by free_store_activity(), and handle_record_store().

monitor_nc

struct GNUNET_NotificationContext* monitor_nc

static

Notification context shared by all monitors.

Definition at line 396 of file gnunet-service-namestore.c.

Referenced by cleanup_task(), handle_monitor_start(), and run().

return_orphaned

int return_orphaned

static

Returned orphaned records?

Definition at line 401 of file gnunet-service-namestore.c.

Referenced by run().