GNUnet  0.11.x
Data Structures | Macros | Functions | Variables
gnunet-service-nse.c File Reference

network size estimation service More...

#include "platform.h"
#include <math.h>
#include "gnunet_util_lib.h"
#include "gnunet_constants.h"
#include "gnunet_protocols.h"
#include "gnunet_signatures.h"
#include "gnunet_statistics_service.h"
#include "gnunet_core_service.h"
#include "gnunet_nse_service.h"
#include "nse.h"
#include <gcrypt.h>
Include dependency graph for gnunet-service-nse.c:

Go to the source code of this file.

Data Structures

struct  NSEPeerEntry
 Per-peer information. More...
 
struct  GNUNET_NSE_FloodMessage
 Network size estimate reply; sent when "this" peer's timer has run out before receiving a valid reply from another peer. More...
 

Macros

#define USE_RANDOM_DELAYS   GNUNET_YES
 Should messages be delayed randomly? This option should be set to GNUNET_NO only for experiments, not in production. More...
 
#define DEBUG_NSE   GNUNET_NO
 Generate extensive debug-level log messages? More...
 
#define HISTORY_SIZE   64
 Over how many values do we calculate the weighted average? More...
 
#define NSE_PRIORITY
 Message priority to use. More...
 
#define WEST   1
 
#define ROUND_SIZE   10
 

Functions

static void setup_estimate_message (struct GNUNET_NSE_ClientMessage *em)
 Initialize a message to clients with the current network size estimate. More...
 
static void handle_start (void *cls, const struct GNUNET_MessageHeader *message)
 Handler for START message from client, triggers an immediate current network estimate notification. More...
 
static double get_matching_bits_delay (uint32_t matching_bits)
 How long should we delay a message to go the given number of matching bits? More...
 
static struct GNUNET_TIME_Relative get_delay_randomization (uint32_t matching_bits)
 What delay randomization should we apply for a given number of matching bits? More...
 
static uint32_t get_matching_bits (struct GNUNET_TIME_Absolute timestamp, const struct GNUNET_PeerIdentity *id)
 Get the number of matching bits that the given timestamp has to the given peer ID. More...
 
static struct GNUNET_TIME_Relative get_transmit_delay (int round_offset)
 Get the transmission delay that should be applied for a particular round. More...
 
static void transmit_task_cb (void *cls)
 Task that triggers a NSE P2P transmission. More...
 
static void update_network_size_estimate ()
 We've sent on our flood message or one that we received which was validated and closer than ours. More...
 
static void setup_flood_message (unsigned int slot, struct GNUNET_TIME_Absolute ts)
 Setup a flood message in our history array at the given slot offset for the given timestamp. More...
 
static int schedule_current_round (void *cls, const struct GNUNET_PeerIdentity *key, void *value)
 Schedule transmission for the given peer for the current round based on what we know about the desired delay. More...
 
static void update_flood_message (void *cls)
 Update our flood message to be sent (and our timestamps). More...
 
static unsigned int count_leading_zeroes (const struct GNUNET_HashCode *hash)
 Count the leading zeroes in hash. More...
 
static int check_proof_of_work (const struct GNUNET_CRYPTO_EddsaPublicKey *pkey, uint64_t val)
 Check whether the given public key and integer are a valid proof of work. More...
 
static void write_proof (void)
 Write our current proof to disk. More...
 
static void find_proof (void *cls)
 Find our proof of work. More...
 
static int verify_message_crypto (const struct GNUNET_NSE_FloodMessage *incoming_flood)
 An incoming flood message has been received which claims to have more bits matching than any we know in this time period. More...
 
static int update_flood_times (void *cls, const struct GNUNET_PeerIdentity *key, void *value)
 Update transmissions for the given peer for the current round based on updated proximity information. More...
 
static void handle_p2p_estimate (void *cls, const struct GNUNET_NSE_FloodMessage *incoming_flood)
 Core handler for size estimate flooding messages. More...
 
static void * handle_core_connect (void *cls, const struct GNUNET_PeerIdentity *peer, struct GNUNET_MQ_Handle *mq)
 Method called whenever a peer connects. More...
 
static void handle_core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer, void *internal_cls)
 Method called whenever a peer disconnects. More...
 
static void shutdown_task (void *cls)
 Task run during shutdown. More...
 
static void core_init (void *cls, const struct GNUNET_PeerIdentity *identity)
 Called on core init/fail. More...
 
static void run (void *cls, const struct GNUNET_CONFIGURATION_Handle *c, struct GNUNET_SERVICE_Handle *service)
 Handle network size estimate clients. More...
 
static void * client_connect_cb (void *cls, struct GNUNET_SERVICE_Client *c, struct GNUNET_MQ_Handle *mq)
 Callback called when a client connects to the service. More...
 
static void client_disconnect_cb (void *cls, struct GNUNET_SERVICE_Client *c, void *internal_cls)
 Callback called when a client disconnected from the service. More...
 
 GNUNET_SERVICE_MAIN ("nse", GNUNET_SERVICE_OPTION_NONE, &run, &client_connect_cb, &client_disconnect_cb, NULL, GNUNET_MQ_hd_fixed_size(start, GNUNET_MESSAGE_TYPE_NSE_START, struct GNUNET_MessageHeader, NULL), GNUNET_MQ_handler_end())
 Define "main" method using service macro. More...
 

Variables

static unsigned long long nse_work_required
 Amount of work required (W-bit collisions) for NSE proofs, in collision-bits. More...
 
static struct GNUNET_TIME_Relative gnunet_nse_interval
 Interval for sending network size estimation flood requests. More...
 
static struct GNUNET_TIME_Relative proof_find_delay
 Interval between proof find runs. More...
 
static struct GNUNET_CRYPTO_PowSalt salt = { "gnunet-nse-proof" }
 Salt for PoW calcualations. More...
 
static GNUNET_NETWORK_STRUCT_END const struct GNUNET_CONFIGURATION_Handlecfg
 Handle to our current configuration. More...
 
static struct GNUNET_STATISTICS_Handlestats
 Handle to the statistics service. More...
 
static struct GNUNET_CORE_Handlecore_api
 Handle to the core service. More...
 
static struct GNUNET_CONTAINER_MultiPeerMappeers
 Map of all connected peers. More...
 
static double current_size_estimate
 The current network size estimate. More...
 
static double current_std_dev = NAN
 The standard deviation of the last HISTORY_SIZE network size estimates. More...
 
static uint32_t hop_count_max
 Current hop counter estimate (estimate for network diameter). More...
 
static struct GNUNET_NSE_FloodMessage next_message
 Message for the next round, if we got any. More...
 
static struct GNUNET_NSE_FloodMessage size_estimate_messages [64]
 Array of recent size estimate messages. More...
 
static unsigned int estimate_index
 Index of most recent estimate. More...
 
static unsigned int estimate_count
 Number of valid entries in the history. More...
 
static struct GNUNET_SCHEDULER_Taskflood_task
 Task scheduled to update our flood message for the next round. More...
 
static struct GNUNET_SCHEDULER_Taskproof_task
 Task scheduled to compute our proof. More...
 
static struct GNUNET_NotificationContextnc
 Notification context, simplifies client broadcasts. More...
 
static struct GNUNET_TIME_Absolute next_timestamp
 The next major time. More...
 
static struct GNUNET_TIME_Absolute current_timestamp
 The current major time. More...
 
static struct GNUNET_CRYPTO_EddsaPrivateKeymy_private_key
 The private key of this peer. More...
 
static struct GNUNET_PeerIdentity my_identity
 The peer identity of this peer. More...
 
static uint64_t my_proof
 Proof of work for this peer. More...
 

Detailed Description

network size estimation service

Author
Nathan Evans
Christian Grothoff

The purpose of this service is to estimate the size of the network. Given a specified interval, each peer hashes the most recent timestamp which is evenly divisible by that interval. This hash is compared in distance to the peer identity to choose an offset. The closer the peer identity to the hashed timestamp, the earlier the peer sends out a "nearest peer" message. The closest peer's message should thus be received before any others, which stops those peer from sending their messages at a later duration. So every peer should receive the same nearest peer message, and from this can calculate the expected number of peers in the network.

Definition in file gnunet-service-nse.c.

Macro Definition Documentation

◆ USE_RANDOM_DELAYS

#define USE_RANDOM_DELAYS   GNUNET_YES

Should messages be delayed randomly? This option should be set to GNUNET_NO only for experiments, not in production.

Definition at line 58 of file gnunet-service-nse.c.

◆ DEBUG_NSE

#define DEBUG_NSE   GNUNET_NO

Generate extensive debug-level log messages?

Definition at line 63 of file gnunet-service-nse.c.

◆ HISTORY_SIZE

#define HISTORY_SIZE   64

Over how many values do we calculate the weighted average?

Definition at line 68 of file gnunet-service-nse.c.

◆ NSE_PRIORITY

#define NSE_PRIORITY
Value:
@ GNUNET_MQ_PRIO_BACKGROUND
Lowest priority, i.e.
@ GNUNET_MQ_PREF_CORK_ALLOWED
Flag to indicate that CORKing is acceptable.
@ GNUNET_MQ_PREF_UNRELIABLE
Flag to indicate that unreliable delivery is acceptable.

Message priority to use.

No real rush, reliability not required. Corking OK.

Definition at line 74 of file gnunet-service-nse.c.

◆ WEST

#define WEST   1

◆ ROUND_SIZE

#define ROUND_SIZE   10

Function Documentation

◆ setup_estimate_message()

static void setup_estimate_message ( struct GNUNET_NSE_ClientMessage em)
static

Initialize a message to clients with the current network size estimate.

Parameters
emmessage to fill in

Definition at line 327 of file gnunet-service-nse.c.

328 {
329  double mean;
330  double sum;
331  double std_dev;
332  double variance;
333  double val;
334  double nsize;
335 
336 #define WEST 1
337  /* Weighted incremental algorithm for stddev according to West (1979) */
338 #if WEST
339  double sumweight;
340  double weight;
341  double q;
342  double r;
343  double temp;
344 
345  mean = 0.0;
346  sum = 0.0;
347  sumweight = 0.0;
348  variance = 0.0;
349  for (unsigned int i = 0; i < estimate_count; i++)
350  {
351  unsigned int j = (estimate_index - i + HISTORY_SIZE) % HISTORY_SIZE;
352 
353  val = htonl (size_estimate_messages[j].matching_bits);
354  weight = estimate_count + 1 - i;
355 
356  temp = weight + sumweight;
357  q = val - mean;
358  r = q * weight / temp;
359  mean += r;
360  sum += sumweight * q * r;
361  sumweight = temp;
362  }
363  if (estimate_count > 0)
364  variance = (sum / sumweight) * estimate_count / (estimate_count - 1.0);
365 #else
366  /* trivial version for debugging */
367  double vsq;
368 
369  /* non-weighted trivial version */
370  sum = 0.0;
371  vsq = 0.0;
372  variance = 0.0;
373  mean = 0.0;
374 
375  for (unsigned int i = 0; i < estimate_count; i++)
376  {
377  unsigned int j = (estimate_index - i + HISTORY_SIZE) % HISTORY_SIZE;
378 
379  val = htonl (size_estimate_messages[j].matching_bits);
380  sum += val;
381  vsq += val * val;
382  }
383  if (0 != estimate_count)
384  {
385  mean = sum / estimate_count;
386  variance = (vsq - mean * sum)
387  / (estimate_count - 1.0); // terrible for numerical stability...
388  }
389 #endif
390  if (variance >= 0)
391  std_dev = sqrt (variance);
392  else
393  std_dev = variance; /* return NaN (due to estimate_count == 0 causing 0.0/0.0) */
394  current_std_dev = std_dev;
395  current_size_estimate = mean;
396 
397  em->header.size = htons (sizeof(struct GNUNET_NSE_ClientMessage));
399  em->reserved = htonl (0);
401  {
402  double se = mean - 0.332747;
403  unsigned int j = GNUNET_CONTAINER_multipeermap_size (peers);
404  if (0 == j)
405  j = 1; /* Avoid log2(0); can only happen if CORE didn't report
406  connection to self yet */
407  nsize = log2 (j);
408  em->size_estimate = GNUNET_hton_double (GNUNET_MAX (se, nsize));
409  em->std_deviation = GNUNET_hton_double (std_dev);
411  "# nodes in the network (estimate)",
412  (uint64_t) pow (2, GNUNET_MAX (se, nsize)),
413  GNUNET_NO);
414  }
415 }
static struct GNUNET_REVOCATION_Query * q
Handle for revocation query.
static unsigned long long matching_bits
Number of matching bits required for revocation.
static struct GNUNET_CONTAINER_MultiPeerMap * peers
Map of all connected peers.
static double current_std_dev
The standard deviation of the last HISTORY_SIZE network size estimates.
static struct GNUNET_NSE_FloodMessage size_estimate_messages[64]
Array of recent size estimate messages.
static unsigned int estimate_index
Index of most recent estimate.
#define HISTORY_SIZE
Over how many values do we calculate the weighted average?
static struct GNUNET_STATISTICS_Handle * stats
Handle to the statistics service.
static unsigned int estimate_count
Number of valid entries in the history.
static double current_size_estimate
The current network size estimate.
#define GNUNET_MAX(a, b)
double GNUNET_hton_double(double d)
Convert double to network byte order.
Definition: common_endian.c:74
@ GNUNET_NO
Definition: gnunet_common.h:94
unsigned int GNUNET_CONTAINER_multipeermap_size(const struct GNUNET_CONTAINER_MultiPeerMap *map)
Get the number of key-value pairs in the map.
#define GNUNET_MESSAGE_TYPE_NSE_ESTIMATE
service->client message indicating
void GNUNET_STATISTICS_set(struct GNUNET_STATISTICS_Handle *handle, const char *name, uint64_t value, int make_persistent)
Set statistic value for the peer.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get(void)
Get the current time.
Definition: time.c:86
struct GNUNET_TIME_AbsoluteNBO GNUNET_TIME_absolute_hton(struct GNUNET_TIME_Absolute a)
Convert absolute time to network byte order.
Definition: time.c:464
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format.
Network size estimate sent from the service to clients.
Definition: nse.h:43
uint32_t reserved
For alignment.
Definition: nse.h:52
double size_estimate
The current estimated network size.
Definition: nse.h:62
struct GNUNET_TIME_AbsoluteNBO timestamp
Timestamp at which the server received the message.
Definition: nse.h:57
double std_deviation
The standard deviation (rounded down to the nearest integer) of size estimations.
Definition: nse.h:69
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_NSE_ESTIMATE.
Definition: nse.h:47

References current_size_estimate, current_std_dev, estimate_count, estimate_index, GNUNET_CONTAINER_multipeermap_size(), GNUNET_hton_double(), GNUNET_MAX, GNUNET_MESSAGE_TYPE_NSE_ESTIMATE, GNUNET_NO, GNUNET_STATISTICS_set(), GNUNET_TIME_absolute_get(), GNUNET_TIME_absolute_hton(), GNUNET_NSE_ClientMessage::header, HISTORY_SIZE, matching_bits, peers, q, GNUNET_NSE_ClientMessage::reserved, GNUNET_MessageHeader::size, GNUNET_NSE_ClientMessage::size_estimate, size_estimate_messages, stats, GNUNET_NSE_ClientMessage::std_deviation, consensus-simulation::sum, GNUNET_NSE_ClientMessage::timestamp, and GNUNET_MessageHeader::type.

Referenced by handle_start(), and update_network_size_estimate().

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◆ handle_start()

static void handle_start ( void *  cls,
const struct GNUNET_MessageHeader message 
)
static

Handler for START message from client, triggers an immediate current network estimate notification.

Also, we remember the client for updates upon future estimate measurements.

Parameters
clsclient who sent the message
messagethe message received

Definition at line 428 of file gnunet-service-nse.c.

429 {
430  struct GNUNET_SERVICE_Client *client = cls;
431  struct GNUNET_MQ_Handle *mq;
432  struct GNUNET_NSE_ClientMessage em;
433  struct GNUNET_MQ_Envelope *env;
434 
435  (void) message;
436  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received START message from client\n");
437  mq = GNUNET_SERVICE_client_get_mq (client);
440  env = GNUNET_MQ_msg_copy (&em.header);
441  GNUNET_MQ_send (mq, env);
443 }
struct GNUNET_MQ_Handle * mq
Definition: 003.c:5
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
static void setup_estimate_message(struct GNUNET_NSE_ClientMessage *em)
Initialize a message to clients with the current network size estimate.
static struct GNUNET_NotificationContext * nc
Notification context, simplifies client broadcasts.
#define GNUNET_log(kind,...)
@ GNUNET_ERROR_TYPE_DEBUG
void GNUNET_MQ_send(struct GNUNET_MQ_Handle *mq, struct GNUNET_MQ_Envelope *ev)
Send a message with the given message queue.
Definition: mq.c:355
struct GNUNET_MQ_Envelope * GNUNET_MQ_msg_copy(const struct GNUNET_MessageHeader *hdr)
Create a new envelope by copying an existing message.
Definition: mq.c:666
void GNUNET_notification_context_add(struct GNUNET_NotificationContext *nc, struct GNUNET_MQ_Handle *mq)
Add a subscriber to the notification context.
Definition: nc.c:160
struct GNUNET_MQ_Handle * GNUNET_SERVICE_client_get_mq(struct GNUNET_SERVICE_Client *c)
Obtain the message queue of c.
Definition: service.c:2438
void GNUNET_SERVICE_client_continue(struct GNUNET_SERVICE_Client *c)
Continue receiving further messages from the given client.
Definition: service.c:2244
Handle to a message queue.
Definition: mq.c:86
Handle to a client that is connected to a service.
Definition: service.c:251

References env, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_MQ_msg_copy(), GNUNET_MQ_send(), GNUNET_notification_context_add(), GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_get_mq(), GNUNET_NSE_ClientMessage::header, mq, nc, and setup_estimate_message().

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◆ get_matching_bits_delay()

static double get_matching_bits_delay ( uint32_t  matching_bits)
static

How long should we delay a message to go the given number of matching bits?

Parameters
matching_bitsnumber of matching bits to consider

Definition at line 453 of file gnunet-service-nse.c.

454 {
455  /* Calculated as: S + f/2 - (f / pi) * (atan(x - p')) */
456  // S is next_timestamp (ignored in return value)
457  // f is frequency (gnunet_nse_interval)
458  // x is matching_bits
459  // p' is current_size_estimate
460  return ((double) gnunet_nse_interval.rel_value_us / (double) 2.0)
463 }
static struct GNUNET_TIME_Relative gnunet_nse_interval
Interval for sending network size estimation flood requests.
uint64_t rel_value_us
The actual value.

◆ get_delay_randomization()

static struct GNUNET_TIME_Relative get_delay_randomization ( uint32_t  matching_bits)
static

What delay randomization should we apply for a given number of matching bits?

Parameters
matching_bitsnumber of matching bits
Returns
random delay to apply

Definition at line 453 of file gnunet-service-nse.c.

474 {
475 #if USE_RANDOM_DELAYS
476  struct GNUNET_TIME_Relative ret;
477  uint32_t i;
478  double d;
479 
481  i = (uint32_t) (d / (double) (hop_count_max + 1));
482  ret.rel_value_us = i;
484  "Randomizing flood using latencies up to %s\n",
486  ret.rel_value_us =
488  return ret;
489 #else
490  return GNUNET_TIME_UNIT_ZERO;
491 #endif
492 }
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
static double get_matching_bits_delay(uint32_t matching_bits)
How long should we delay a message to go the given number of matching bits?
static uint32_t hop_count_max
Current hop counter estimate (estimate for network diameter).
@ GNUNET_YES
Definition: gnunet_common.h:97
uint32_t GNUNET_CRYPTO_random_u32(enum GNUNET_CRYPTO_Quality mode, uint32_t i)
Produce a random value.
@ GNUNET_CRYPTO_QUALITY_WEAK
No good quality of the operation is needed (i.e., random numbers can be pseudo-random).
#define GNUNET_TIME_UNIT_ZERO
Relative time zero.
const char * GNUNET_STRINGS_relative_time_to_string(struct GNUNET_TIME_Relative delta, int do_round)
Give relative time in human-readable fancy format.
Definition: strings.c:557
Time for relative time used by GNUnet, in microseconds.

References current_size_estimate, gnunet_nse_interval, matching_bits, and GNUNET_TIME_Relative::rel_value_us.

◆ get_matching_bits()

static uint32_t get_matching_bits ( struct GNUNET_TIME_Absolute  timestamp,
const struct GNUNET_PeerIdentity id 
)
static

Get the number of matching bits that the given timestamp has to the given peer ID.

Parameters
timestamptime to generate key
idpeer identity to compare with
Returns
number of matching bits

Definition at line 503 of file gnunet-service-nse.c.

505 {
506  struct GNUNET_HashCode timestamp_hash;
507  struct GNUNET_HashCode pid_hash;
508 
509  GNUNET_CRYPTO_hash (&timestamp.abs_value_us,
510  sizeof(timestamp.abs_value_us),
511  &timestamp_hash);
512  GNUNET_CRYPTO_hash (id, sizeof(struct GNUNET_PeerIdentity), &pid_hash);
513  return GNUNET_CRYPTO_hash_matching_bits (&timestamp_hash, &pid_hash);
514 }
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:41
unsigned int GNUNET_CRYPTO_hash_matching_bits(const struct GNUNET_HashCode *first, const struct GNUNET_HashCode *second)
Determine how many low order bits match in two struct GNUNET_HashCodes.
Definition: crypto_hash.c:189
A 512-bit hashcode.
The identity of the host (wraps the signing key of the peer).
uint64_t abs_value_us
The actual value.

References GNUNET_TIME_Absolute::abs_value_us, GNUNET_CRYPTO_hash(), and GNUNET_CRYPTO_hash_matching_bits().

Referenced by setup_flood_message(), and update_flood_message().

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◆ get_transmit_delay()

static struct GNUNET_TIME_Relative get_transmit_delay ( int  round_offset)
static

Get the transmission delay that should be applied for a particular round.

Parameters
round_offset-1 for the previous round (random delay between 0 and 50ms) 0 for the current round (based on our proximity to time key)
Returns
delay that should be applied

Definition at line 503 of file gnunet-service-nse.c.

527 {
528  struct GNUNET_TIME_Relative ret;
529  struct GNUNET_TIME_Absolute tgt;
530  double dist_delay;
531  uint32_t matching_bits;
532 
533  switch (round_offset)
534  {
535  case -1:
536  /* previous round is randomized between 0 and 50 ms */
537 #if USE_RANDOM_DELAYS
538  ret.rel_value_us =
540 #else
542 #endif
544  "Transmitting previous round behind schedule in %s\n",
546  return ret;
547 
548  case 0:
549  /* current round is based on best-known matching_bits */
550  matching_bits =
552  dist_delay = get_matching_bits_delay (matching_bits);
554  ret.rel_value_us = (uint64_t) dist_delay;
556  "For round %s, delay for %u matching bits is %s\n",
558  (unsigned int) matching_bits,
560  /* now consider round start time and add delay to it */
563  }
564  GNUNET_break (0);
566 }
static struct GNUNET_TIME_Absolute current_timestamp
The current major time.
static struct GNUNET_TIME_Relative get_delay_randomization(uint32_t matching_bits)
What delay randomization should we apply for a given number of matching bits?
uint64_t GNUNET_CRYPTO_random_u64(enum GNUNET_CRYPTO_Quality mode, uint64_t max)
Random on unsigned 64-bit values.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
struct GNUNET_TIME_Relative GNUNET_TIME_absolute_get_remaining(struct GNUNET_TIME_Absolute future)
Given a timestamp in the future, how much time remains until then?
Definition: time.c:232
const char * GNUNET_STRINGS_absolute_time_to_string(struct GNUNET_TIME_Absolute t)
Like asctime, except for GNUnet time.
Definition: strings.c:604
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_add(struct GNUNET_TIME_Absolute start, struct GNUNET_TIME_Relative duration)
Add a given relative duration to the given start time.
Definition: time.c:277
Time for absolute times used by GNUnet, in microseconds.

Referenced by handle_core_connect(), schedule_current_round(), transmit_task_cb(), and update_flood_times().

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◆ transmit_task_cb()

static void transmit_task_cb ( void *  cls)
static

Task that triggers a NSE P2P transmission.

Parameters
clsthe struct NSEPeerEntry *

Definition at line 575 of file gnunet-service-nse.c.

576 {
577  struct NSEPeerEntry *peer_entry = cls;
578  unsigned int idx;
579  struct GNUNET_MQ_Envelope *env;
580 
581  peer_entry->transmit_task = NULL;
582  idx = estimate_index;
583  if (GNUNET_NO == peer_entry->previous_round)
584  {
585  idx = (idx + HISTORY_SIZE - 1) % HISTORY_SIZE;
586  peer_entry->previous_round = GNUNET_YES;
587  peer_entry->transmit_task =
590  peer_entry);
591  }
592  if ((0 == ntohl (size_estimate_messages[idx].hop_count)) &&
593  (NULL != proof_task))
594  {
596  "# flood messages not generated (no proof yet)",
597  1,
598  GNUNET_NO);
599  return;
600  }
601  if (0 == ntohs (size_estimate_messages[idx].header.size))
602  {
604  "# flood messages not generated (lack of history)",
605  1,
606  GNUNET_NO);
607  return;
608  }
610  "In round %s, sending to `%s' estimate with %u bits\n",
613  size_estimate_messages[idx].timestamp)),
614  GNUNET_i2s (peer_entry->id),
615  (unsigned int) ntohl (size_estimate_messages[idx].matching_bits));
616  if (0 == ntohl (size_estimate_messages[idx].hop_count))
617  GNUNET_STATISTICS_update (stats, "# flood messages started", 1, GNUNET_NO);
619  "# flood messages transmitted",
620  1,
621  GNUNET_NO);
622 #if ENABLE_NSE_HISTOGRAM
623  peer_entry->transmitted_messages++;
624  peer_entry->last_transmitted_size =
626 #endif
628  GNUNET_MQ_send (peer_entry->mq, env);
629 }
static void transmit_task_cb(void *cls)
Task that triggers a NSE P2P transmission.
static struct GNUNET_SCHEDULER_Task * proof_task
Task scheduled to compute our proof.
static struct GNUNET_TIME_Relative get_transmit_delay(int round_offset)
Get the transmission delay that should be applied for a particular round.
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1269
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_ntoh(struct GNUNET_TIME_AbsoluteNBO a)
Convert absolute time from network byte order.
Definition: time.c:542
Per-peer information.
struct GNUNET_MQ_Handle * mq
Core handle for sending messages to this peer.
struct GNUNET_SCHEDULER_Task * transmit_task
Task scheduled to send message to this peer.
const struct GNUNET_PeerIdentity * id
What is the identity of the peer?
int previous_round
Did we receive or send a message about the previous round to this peer yet? GNUNET_YES if the previou...

References env, estimate_index, get_transmit_delay(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_i2s(), GNUNET_log, GNUNET_MQ_msg_copy(), GNUNET_MQ_send(), GNUNET_NO, GNUNET_SCHEDULER_add_delayed(), GNUNET_STATISTICS_update(), GNUNET_STRINGS_absolute_time_to_string(), GNUNET_TIME_absolute_ntoh(), GNUNET_YES, HISTORY_SIZE, NSEPeerEntry::id, matching_bits, NSEPeerEntry::mq, NSEPeerEntry::previous_round, proof_task, size_estimate_messages, stats, and NSEPeerEntry::transmit_task.

Referenced by handle_core_connect(), handle_p2p_estimate(), schedule_current_round(), and update_flood_times().

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◆ update_network_size_estimate()

static void update_network_size_estimate ( )
static

We've sent on our flood message or one that we received which was validated and closer than ours.

Update the global list of recent messages and the average. Also re-broadcast the message to any clients.

Definition at line 639 of file gnunet-service-nse.c.

640 {
641  struct GNUNET_NSE_ClientMessage em;
642 
645 }
void GNUNET_notification_context_broadcast(struct GNUNET_NotificationContext *nc, const struct GNUNET_MessageHeader *msg, int can_drop)
Send a message to all subscribers of this context.
Definition: nc.c:189

References GNUNET_notification_context_broadcast(), GNUNET_YES, GNUNET_NSE_ClientMessage::header, nc, and setup_estimate_message().

Referenced by handle_p2p_estimate().

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◆ setup_flood_message()

static void setup_flood_message ( unsigned int  slot,
struct GNUNET_TIME_Absolute  ts 
)
static

Setup a flood message in our history array at the given slot offset for the given timestamp.

Parameters
slotindex to use
tstimestamp to use

Definition at line 656 of file gnunet-service-nse.c.

657 {
658  struct GNUNET_NSE_FloodMessage *fm;
659  uint32_t matching_bits;
660 
662  fm = &size_estimate_messages[slot];
663  fm->header.size = htons (sizeof(struct GNUNET_NSE_FloodMessage));
665  fm->hop_count = htonl (0);
667  fm->purpose.size =
668  htonl (sizeof(struct GNUNET_NSE_FloodMessage)
669  - sizeof(struct GNUNET_MessageHeader) - sizeof(uint32_t)
670  - sizeof(struct GNUNET_CRYPTO_EddsaSignature));
671  fm->matching_bits = htonl (matching_bits);
673  fm->origin = my_identity;
674  fm->proof_of_work = my_proof;
675  if (nse_work_required > 0)
678  &fm->purpose,
679  &fm->signature));
680  else
681  memset (&fm->signature, 0, sizeof(fm->signature));
682 }
static struct GNUNET_PeerIdentity my_identity
The peer identity of this peer.
static uint64_t my_proof
Proof of work for this peer.
static unsigned long long nse_work_required
Amount of work required (W-bit collisions) for NSE proofs, in collision-bits.
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
The private key of this peer.
static uint32_t get_matching_bits(struct GNUNET_TIME_Absolute timestamp, const struct GNUNET_PeerIdentity *id)
Get the number of matching bits that the given timestamp has to the given peer ID.
@ GNUNET_OK
Definition: gnunet_common.h:95
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_eddsa_sign_(const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose, struct GNUNET_CRYPTO_EddsaSignature *sig)
EdDSA sign a given block.
Definition: crypto_ecc.c:599
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD
P2P message sent from nearest peer.
#define GNUNET_SIGNATURE_PURPOSE_NSE_SEND
Signature of a network size estimate message.
uint32_t size
How many bytes does this signature sign? (including this purpose header); in network byte order (!...
uint32_t purpose
What does this signature vouch for? This must contain a GNUNET_SIGNATURE_PURPOSE_XXX constant (from g...
an ECC signature using EdDSA.
Header for all communications.
Network size estimate reply; sent when "this" peer's timer has run out before receiving a valid reply...
uint32_t hop_count
Number of hops this message has taken so far.
uint32_t matching_bits
Number of matching bits between the hash of timestamp and the initiator's public key.
struct GNUNET_TIME_AbsoluteNBO timestamp
The current timestamp value (which all peers should agree on).
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD.
struct GNUNET_PeerIdentity origin
Public key of the originator.
uint64_t proof_of_work
Proof of work, causing leading zeros when hashed with pkey.
struct GNUNET_CRYPTO_EccSignaturePurpose purpose
Purpose.
struct GNUNET_CRYPTO_EddsaSignature signature
Signature (over range specified in purpose).

References get_matching_bits(), GNUNET_assert, GNUNET_CRYPTO_eddsa_sign_(), GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD, GNUNET_OK, GNUNET_SIGNATURE_PURPOSE_NSE_SEND, GNUNET_TIME_absolute_hton(), GNUNET_NSE_FloodMessage::header, GNUNET_NSE_FloodMessage::hop_count, GNUNET_NSE_FloodMessage::matching_bits, matching_bits, my_identity, my_private_key, my_proof, nse_work_required, GNUNET_NSE_FloodMessage::origin, GNUNET_NSE_FloodMessage::proof_of_work, GNUNET_CRYPTO_EccSignaturePurpose::purpose, GNUNET_NSE_FloodMessage::purpose, GNUNET_NSE_FloodMessage::signature, GNUNET_MessageHeader::size, GNUNET_CRYPTO_EccSignaturePurpose::size, size_estimate_messages, GNUNET_NSE_FloodMessage::timestamp, and GNUNET_MessageHeader::type.

Referenced by core_init(), find_proof(), and update_flood_message().

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◆ schedule_current_round()

static int schedule_current_round ( void *  cls,
const struct GNUNET_PeerIdentity key,
void *  value 
)
static

Schedule transmission for the given peer for the current round based on what we know about the desired delay.

Parameters
clsunused
keyhash of peer identity
valuethe struct NSEPeerEntry
Returns
GNUNET_OK (continue to iterate)

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

698 {
699  struct NSEPeerEntry *peer_entry = value;
701 
702  (void) cls;
703  (void) key;
704  if (NULL != peer_entry->transmit_task)
705  {
707  peer_entry->previous_round = GNUNET_NO;
708  }
709 #if ENABLE_NSE_HISTOGRAM
710  if (peer_entry->received_messages > 1)
712  "# extra messages",
713  peer_entry->received_messages - 1,
714  GNUNET_NO);
715  peer_entry->transmitted_messages = 0;
716  peer_entry->last_transmitted_size = 0;
717  peer_entry->received_messages = 0;
718 #endif
719  delay =
720  get_transmit_delay ((GNUNET_NO == peer_entry->previous_round) ? -1 : 0);
721  peer_entry->transmit_task =
723  return GNUNET_OK;
724 }
struct GNUNET_HashCode key
The key used in the DHT.
static char * value
Value of the record to add/remove.
static struct GNUNET_TIME_Relative delay
When should dkg communication start?
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:972

References delay, get_transmit_delay(), GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_add_delayed(), GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_update(), key, NSEPeerEntry::previous_round, stats, NSEPeerEntry::transmit_task, transmit_task_cb(), and value.

Referenced by update_flood_message().

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◆ update_flood_message()

static void update_flood_message ( void *  cls)
static

Update our flood message to be sent (and our timestamps).

Parameters
clsunused

Definition at line 733 of file gnunet-service-nse.c.

734 {
735  struct GNUNET_TIME_Relative offset;
736 
737  (void) cls;
738  flood_task = NULL;
740  if (0 != offset.rel_value_us)
741  {
742  /* somehow run early, delay more */
743  flood_task =
745  return;
746  }
749  estimate_count++;
756  ntohl (next_message.matching_bits)))
757  {
758  /* we received a message for this round way early, use it! */
761  htonl (1 + ntohl (next_message.hop_count));
762  }
763  else
765  next_message.matching_bits = htonl (0); /* reset for 'next' round */
766  hop_count_max = 0;
767  for (unsigned int i = 0; i < HISTORY_SIZE; i++)
768  hop_count_max =
769  GNUNET_MAX (ntohl (size_estimate_messages[i].hop_count), hop_count_max);
771  flood_task =
773 }
static void update_flood_message(void *cls)
Update our flood message to be sent (and our timestamps).
static void setup_flood_message(unsigned int slot, struct GNUNET_TIME_Absolute ts)
Setup a flood message in our history array at the given slot offset for the given timestamp.
static int schedule_current_round(void *cls, const struct GNUNET_PeerIdentity *key, void *value)
Schedule transmission for the given peer for the current round based on what we know about the desire...
static struct GNUNET_NSE_FloodMessage next_message
Message for the next round, if we got any.
static struct GNUNET_SCHEDULER_Task * flood_task
Task scheduled to update our flood message for the next round.
static struct GNUNET_TIME_Absolute next_timestamp
The next major time.
int GNUNET_CONTAINER_multipeermap_iterate(struct GNUNET_CONTAINER_MultiPeerMap *map, GNUNET_CONTAINER_PeerMapIterator it, void *it_cls)
Iterate over all entries in the map.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_at(struct GNUNET_TIME_Absolute at, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run at the specified time.
Definition: scheduler.c:1246

References GNUNET_TIME_Absolute::abs_value_us, current_timestamp, estimate_count, estimate_index, flood_task, get_matching_bits(), GNUNET_CONTAINER_multipeermap_iterate(), GNUNET_MAX, gnunet_nse_interval, GNUNET_SCHEDULER_add_at(), GNUNET_SCHEDULER_add_delayed(), GNUNET_TIME_absolute_add(), GNUNET_TIME_absolute_get_remaining(), GNUNET_TIME_absolute_ntoh(), HISTORY_SIZE, GNUNET_NSE_FloodMessage::hop_count, hop_count_max, GNUNET_NSE_FloodMessage::matching_bits, my_identity, next_message, next_timestamp, peers, GNUNET_TIME_Relative::rel_value_us, schedule_current_round(), setup_flood_message(), size_estimate_messages, and GNUNET_NSE_FloodMessage::timestamp.

Referenced by core_init().

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◆ count_leading_zeroes()

static unsigned int count_leading_zeroes ( const struct GNUNET_HashCode hash)
static

Count the leading zeroes in hash.

Parameters
hashto count leading zeros in
Returns
the number of leading zero bits.

Definition at line 783 of file gnunet-service-nse.c.

784 {
785  unsigned int hash_count;
786 
787  hash_count = 0;
788  while (0 == GNUNET_CRYPTO_hash_get_bit_ltr (hash, hash_count))
789  hash_count++;
790  return hash_count;
791 }
int GNUNET_CRYPTO_hash_get_bit_ltr(const struct GNUNET_HashCode *code, unsigned int bit)
Obtain a bit from a hashcode.
Definition: crypto_hash.c:171

References GNUNET_CRYPTO_hash_get_bit_ltr().

Referenced by check_proof_of_work(), and find_proof().

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◆ check_proof_of_work()

static int check_proof_of_work ( const struct GNUNET_CRYPTO_EddsaPublicKey pkey,
uint64_t  val 
)
static

Check whether the given public key and integer are a valid proof of work.

Parameters
pkeythe public key
valthe integer
Returns
GNUNET_YES if valid, GNUNET_NO if not

Definition at line 803 of file gnunet-service-nse.c.

805 {
806  char buf[sizeof(struct GNUNET_CRYPTO_EddsaPublicKey)
807  + sizeof(val)] GNUNET_ALIGN;
808  struct GNUNET_HashCode result;
809 
810  GNUNET_memcpy (buf, &val, sizeof(val));
811  GNUNET_memcpy (&buf[sizeof(val)],
812  pkey,
813  sizeof(struct GNUNET_CRYPTO_EddsaPublicKey));
815  buf,
816  sizeof(buf),
817  &result);
819  : GNUNET_NO;
820 }
static char * pkey
Public key of the zone to look in, in ASCII.
static int result
Global testing status.
static struct GNUNET_CRYPTO_PowSalt salt
Salt for PoW calcualations.
static unsigned int count_leading_zeroes(const struct GNUNET_HashCode *hash)
Count the leading zeroes in hash.
static char buf[2048]
#define GNUNET_ALIGN
gcc-ism to force alignment; we use this to align char-arrays that may then be cast to 'struct's.
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
void GNUNET_CRYPTO_pow_hash(const struct GNUNET_CRYPTO_PowSalt *salt, const void *buf, size_t buf_len, struct GNUNET_HashCode *result)
Calculate the 'proof-of-work' hash (an expensive hash).
Definition: crypto_pow.c:41
Public ECC key (always for curve Ed25519) encoded in a format suitable for network transmission and E...

References buf, count_leading_zeroes(), GNUNET_ALIGN, GNUNET_CRYPTO_pow_hash(), GNUNET_memcpy, GNUNET_NO, GNUNET_YES, nse_work_required, pkey, result, and salt.

Referenced by core_init(), and verify_message_crypto().

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◆ write_proof()

static void write_proof ( void  )
static

Write our current proof to disk.

Definition at line 827 of file gnunet-service-nse.c.

828 {
829  char *proof;
830 
831  if (GNUNET_OK !=
833  "NSE",
834  "PROOFFILE",
835  &proof))
836  return;
838  if (GNUNET_OK !=
840  &my_proof,
841  sizeof(my_proof),
845  "write",
846  proof);
847  GNUNET_free (proof);
848 }
static uint64_t proof
Definition: gnunet-scrypt.c:48
static GNUNET_NETWORK_STRUCT_END const struct GNUNET_CONFIGURATION_Handle * cfg
Handle to our current configuration.
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_get_value_filename(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, char **value)
Get a configuration value that should be the name of a file or directory.
enum GNUNET_GenericReturnValue GNUNET_DISK_fn_write(const char *fn, const void *buf, size_t buf_size, enum GNUNET_DISK_AccessPermissions mode)
Write a buffer to a file atomically.
Definition: disk.c:725
enum GNUNET_GenericReturnValue GNUNET_DISK_directory_remove(const char *filename)
Remove all files in a directory (rm -rf).
Definition: disk.c:1085
@ GNUNET_DISK_PERM_USER_READ
Owner can read.
@ GNUNET_DISK_PERM_USER_WRITE
Owner can write.
#define GNUNET_log_strerror_file(level, cmd, filename)
Log an error message at log-level 'level' that indicates a failure of the command 'cmd' with the mess...
@ GNUNET_ERROR_TYPE_WARNING
#define GNUNET_free(ptr)
Wrapper around free.

References cfg, GNUNET_CONFIGURATION_get_value_filename(), GNUNET_DISK_directory_remove(), GNUNET_DISK_fn_write(), GNUNET_DISK_PERM_USER_READ, GNUNET_DISK_PERM_USER_WRITE, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log_strerror_file, GNUNET_OK, my_proof, and proof.

Referenced by find_proof(), and shutdown_task().

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◆ find_proof()

static void find_proof ( void *  cls)
static

Find our proof of work.

Parameters
clsclosure (unused)

Definition at line 857 of file gnunet-service-nse.c.

858 {
859 #define ROUND_SIZE 10
860  uint64_t counter;
861  char buf[sizeof(struct GNUNET_CRYPTO_EddsaPublicKey)
862  + sizeof(uint64_t)] GNUNET_ALIGN;
863  struct GNUNET_HashCode result;
864  unsigned int i;
865 
866  (void) cls;
867  proof_task = NULL;
868  GNUNET_memcpy (&buf[sizeof(uint64_t)],
869  &my_identity,
870  sizeof(struct GNUNET_PeerIdentity));
871  i = 0;
872  counter = my_proof;
873  while ((counter != UINT64_MAX) && (i < ROUND_SIZE))
874  {
875  GNUNET_memcpy (buf, &counter, sizeof(uint64_t));
877  buf,
878  sizeof(buf),
879  &result);
881  {
882  my_proof = counter;
884  "Proof of work found: %llu!\n",
885  (unsigned long long) GNUNET_ntohll (counter));
886  write_proof ();
888  return;
889  }
890  counter++;
891  i++;
892  }
893  if (my_proof / (100 * ROUND_SIZE) < counter / (100 * ROUND_SIZE))
894  {
896  "Testing proofs currently at %llu\n",
897  (unsigned long long) counter);
898  /* remember progress every 100 rounds */
899  my_proof = counter;
900  write_proof ();
901  }
902  else
903  {
904  my_proof = counter;
905  }
906  proof_task =
909  &find_proof,
910  NULL);
911 }
static void find_proof(void *cls)
Find our proof of work.
static struct GNUNET_TIME_Relative proof_find_delay
Interval between proof find runs.
#define ROUND_SIZE
static void write_proof(void)
Write our current proof to disk.
uint64_t GNUNET_ntohll(uint64_t n)
Convert unsigned 64-bit integer to host byte order.
Definition: common_endian.c:53
@ GNUNET_SCHEDULER_PRIORITY_IDLE
Run when otherwise idle.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed_with_priority(struct GNUNET_TIME_Relative delay, enum GNUNET_SCHEDULER_Priority priority, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1199

References buf, count_leading_zeroes(), current_timestamp, estimate_index, GNUNET_ALIGN, GNUNET_CRYPTO_pow_hash(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_memcpy, GNUNET_ntohll(), GNUNET_SCHEDULER_add_delayed_with_priority(), GNUNET_SCHEDULER_PRIORITY_IDLE, my_identity, my_proof, nse_work_required, proof_find_delay, proof_task, result, ROUND_SIZE, salt, setup_flood_message(), and write_proof().

Referenced by run().

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◆ verify_message_crypto()

static int verify_message_crypto ( const struct GNUNET_NSE_FloodMessage incoming_flood)
static

An incoming flood message has been received which claims to have more bits matching than any we know in this time period.

Verify the signature and/or proof of work.

Parameters
incoming_floodthe message to verify
Returns
GNUNET_YES if the message is verified GNUNET_NO if the key/signature don't verify

Definition at line 924 of file gnunet-service-nse.c.

925 {
926  if (GNUNET_YES != check_proof_of_work (&incoming_flood->origin.public_key,
927  incoming_flood->proof_of_work))
928  {
930  "Proof of work invalid: %llu!\n",
931  (unsigned long long) GNUNET_ntohll (
932  incoming_flood->proof_of_work));
933  GNUNET_break_op (0);
934  return GNUNET_NO;
935  }
936  if ((nse_work_required > 0) &&
937  (GNUNET_OK !=
939  &incoming_flood->purpose,
940  &incoming_flood->signature,
941  &incoming_flood->origin.public_key)))
942  {
943  GNUNET_break_op (0);
944  return GNUNET_NO;
945  }
946  return GNUNET_YES;
947 }
static int check_proof_of_work(const struct GNUNET_CRYPTO_EddsaPublicKey *pkey, uint64_t val)
Check whether the given public key and integer are a valid proof of work.
int GNUNET_CRYPTO_eddsa_verify_(uint32_t purpose, const struct GNUNET_CRYPTO_EccSignaturePurpose *validate, const struct GNUNET_CRYPTO_EddsaSignature *sig, const struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Verify EdDSA signature.
Definition: crypto_ecc.c:682
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
struct GNUNET_CRYPTO_EddsaPublicKey public_key

References check_proof_of_work(), GNUNET_break_op, GNUNET_CRYPTO_eddsa_verify_(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_NO, GNUNET_ntohll(), GNUNET_OK, GNUNET_SIGNATURE_PURPOSE_NSE_SEND, GNUNET_YES, nse_work_required, GNUNET_NSE_FloodMessage::origin, GNUNET_NSE_FloodMessage::proof_of_work, GNUNET_PeerIdentity::public_key, GNUNET_NSE_FloodMessage::purpose, and GNUNET_NSE_FloodMessage::signature.

Referenced by handle_p2p_estimate().

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◆ update_flood_times()

static int update_flood_times ( void *  cls,
const struct GNUNET_PeerIdentity key,
void *  value 
)
static

Update transmissions for the given peer for the current round based on updated proximity information.

Parameters
clspeer entry to exclude from updates
keyhash of peer identity
valuethe struct NSEPeerEntry * of a peer to transmit to
Returns
GNUNET_OK (continue to iterate)

Definition at line 960 of file gnunet-service-nse.c.

963 {
964  struct NSEPeerEntry *exclude = cls;
965  struct NSEPeerEntry *peer_entry = value;
967 
968  (void) key;
969  if (peer_entry == exclude)
970  return GNUNET_OK; /* trigger of the update */
971  if (GNUNET_NO == peer_entry->previous_round)
972  {
973  /* still stuck in previous round, no point to update, check that
974  * we are active here though... */
975  if (NULL == peer_entry->transmit_task)
976  {
977  GNUNET_break (0);
978  }
979  return GNUNET_OK;
980  }
981  if (NULL != peer_entry->transmit_task)
982  {
984  peer_entry->transmit_task = NULL;
985  }
987  peer_entry->transmit_task =
989  return GNUNET_OK;
990 }

References delay, get_transmit_delay(), GNUNET_break, GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_add_delayed(), GNUNET_SCHEDULER_cancel(), key, NSEPeerEntry::previous_round, NSEPeerEntry::transmit_task, transmit_task_cb(), and value.

Referenced by handle_p2p_estimate().

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◆ handle_p2p_estimate()

static void handle_p2p_estimate ( void *  cls,
const struct GNUNET_NSE_FloodMessage incoming_flood 
)
static

Core handler for size estimate flooding messages.

Parameters
clspeer this message is from
incoming_floodreceived message

Definition at line 1000 of file gnunet-service-nse.c.

1002 {
1003  struct NSEPeerEntry *peer_entry = cls;
1004  struct GNUNET_TIME_Absolute ts;
1005  uint32_t matching_bits;
1006  unsigned int idx;
1007 
1008 #if ENABLE_NSE_HISTOGRAM
1009  {
1010  uint64_t t;
1011 
1013  if (NULL != lh)
1014  GNUNET_TESTBED_LOGGER_write (lh, &t, sizeof(uint64_t));
1015  if (NULL != histogram)
1016  GNUNET_BIO_write_int64 (histogram, "histogram-time", t);
1017  }
1018 #endif
1019  GNUNET_STATISTICS_update (stats, "# flood messages received", 1, GNUNET_NO);
1020  matching_bits = ntohl (incoming_flood->matching_bits);
1021 #if DEBUG_NSE
1022  {
1023  char origin[5];
1024  char pred[5];
1025  struct GNUNET_PeerIdentity os;
1026 
1027  GNUNET_snprintf (origin,
1028  sizeof(origin),
1029  "%s",
1030  GNUNET_i2s (&incoming_flood->origin));
1031  GNUNET_snprintf (pred, sizeof(pred), "%s", GNUNET_i2s (peer_entry->id));
1033  "Flood at %s from `%s' via `%s' at `%s' with bits %u\n",
1035  GNUNET_TIME_absolute_ntoh (incoming_flood->timestamp)),
1036  origin,
1037  pred,
1039  (unsigned int) matching_bits);
1040  }
1041 #endif
1042 
1043 #if ENABLE_NSE_HISTOGRAM
1044  peer_entry->received_messages++;
1045  if ((peer_entry->transmitted_messages > 0) &&
1046  (peer_entry->last_transmitted_size >= matching_bits) )
1047  GNUNET_STATISTICS_update (stats, "# cross messages", 1, GNUNET_NO);
1048 #endif
1049 
1050  ts = GNUNET_TIME_absolute_ntoh (incoming_flood->timestamp);
1051  if (ts.abs_value_us == current_timestamp.abs_value_us)
1052  idx = estimate_index;
1053  else if (ts.abs_value_us ==
1055  idx = (estimate_index + HISTORY_SIZE - 1) % HISTORY_SIZE;
1056  else if (ts.abs_value_us == next_timestamp.abs_value_us)
1057  {
1058  if (matching_bits <= ntohl (next_message.matching_bits))
1059  return; /* ignore, simply too early/late */
1060  if (GNUNET_YES != verify_message_crypto (incoming_flood))
1061  {
1063  "Peer %s is likely ill-configured!\n",
1064  GNUNET_i2s (peer_entry->id));
1065  GNUNET_break_op (0);
1066  return;
1067  }
1068  next_message = *incoming_flood;
1069  return;
1070  }
1071  else
1072  {
1074  "# flood messages discarded (clock skew too large)",
1075  1,
1076  GNUNET_NO);
1077  return;
1078  }
1079  if (0 == (GNUNET_memcmp (peer_entry->id, &my_identity)))
1080  {
1081  /* send to self, update our own estimate IF this also comes from us! */
1082  if (0 == GNUNET_memcmp (&incoming_flood->origin, &my_identity))
1084  return;
1085  }
1087  {
1088  /* Cancel transmission in the other direction, as this peer clearly has
1089  up-to-date information already. Even if we didn't talk to this peer in
1090  the previous round, we should no longer send it stale information as it
1091  told us about the current round! */
1092  peer_entry->previous_round = GNUNET_YES;
1093  if (idx != estimate_index)
1094  {
1095  /* do not transmit information for the previous round to this peer
1096  anymore (but allow current round) */
1097  return;
1098  }
1099  /* got up-to-date information for current round, cancel transmission to
1100  * this peer altogether */
1101  if (NULL != peer_entry->transmit_task)
1102  {
1103  GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
1104  peer_entry->transmit_task = NULL;
1105  }
1106  return;
1107  }
1109  {
1110  if ((idx < estimate_index) && (peer_entry->previous_round == GNUNET_YES))
1111  {
1112  peer_entry->previous_round = GNUNET_NO;
1113  }
1114  /* push back our result now, that peer is spreading bad information... */
1115  if (NULL != peer_entry->transmit_task)
1116  GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
1117  peer_entry->transmit_task =
1119  /* Not closer than our most recent message, no need to do work here */
1121  "# flood messages ignored (had closer already)",
1122  1,
1123  GNUNET_NO);
1124  return;
1125  }
1126  if (GNUNET_YES != verify_message_crypto (incoming_flood))
1127  {
1128  GNUNET_break_op (0);
1129  return;
1130  }
1132  ntohl (size_estimate_messages[idx].matching_bits));
1133  /* Cancel transmission in the other direction, as this peer clearly has
1134  * up-to-date information already.
1135  */
1136  peer_entry->previous_round = GNUNET_YES;
1137  if (idx == estimate_index)
1138  {
1139  /* cancel any activity for current round */
1140  if (NULL != peer_entry->transmit_task)
1141  {
1142  GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
1143  peer_entry->transmit_task = NULL;
1144  }
1145  }
1146  size_estimate_messages[idx] = *incoming_flood;
1148  htonl (ntohl (incoming_flood->hop_count) + 1);
1149  hop_count_max =
1150  GNUNET_MAX (ntohl (incoming_flood->hop_count) + 1, hop_count_max);
1152  "# estimated network diameter",
1153  hop_count_max,
1154  GNUNET_NO);
1155 
1156  /* have a new, better size estimate, inform clients */
1158 
1159  /* flood to rest */
1162  peer_entry);
1163 }
static ogg_stream_state os
Ogg stream state.
static int update_flood_times(void *cls, const struct GNUNET_PeerIdentity *key, void *value)
Update transmissions for the given peer for the current round based on updated proximity information.
static void update_network_size_estimate()
We've sent on our flood message or one that we received which was validated and closer than ours.
static int verify_message_crypto(const struct GNUNET_NSE_FloodMessage *incoming_flood)
An incoming flood message has been received which claims to have more bits matching than any we know ...
static struct GNUNET_SCHEDULER_Task * t
Main task.
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
int GNUNET_BIO_write_int64(struct GNUNET_BIO_WriteHandle *h, const char *what, int64_t i)
Write an (u)int64_t.
Definition: bio.c:956
@ GNUNET_ERROR_TYPE_ERROR
int GNUNET_snprintf(char *buf, size_t size, const char *format,...) __attribute__((format(printf
Like snprintf, just aborts if the buffer is of insufficient size.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1296
void GNUNET_TESTBED_LOGGER_write(struct GNUNET_TESTBED_LOGGER_Handle *h, const void *data, size_t size)
Send data to be logged to the logger service.

References GNUNET_TIME_Absolute::abs_value_us, current_timestamp, estimate_index, GNUNET_assert, GNUNET_BIO_write_int64(), GNUNET_break_op, GNUNET_CONTAINER_multipeermap_iterate(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_i2s(), GNUNET_log, GNUNET_MAX, GNUNET_memcmp, GNUNET_NO, gnunet_nse_interval, GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), GNUNET_snprintf(), GNUNET_STATISTICS_set(), GNUNET_STATISTICS_update(), GNUNET_STRINGS_absolute_time_to_string(), GNUNET_TESTBED_LOGGER_write(), GNUNET_TIME_absolute_get(), GNUNET_TIME_absolute_ntoh(), GNUNET_YES, HISTORY_SIZE, GNUNET_NSE_FloodMessage::hop_count, hop_count_max, NSEPeerEntry::id, GNUNET_NSE_FloodMessage::matching_bits, matching_bits, my_identity, next_message, next_timestamp, GNUNET_NSE_FloodMessage::origin, os, peers, NSEPeerEntry::previous_round, GNUNET_TIME_Relative::rel_value_us, size_estimate_messages, stats, t, GNUNET_NSE_FloodMessage::timestamp, NSEPeerEntry::transmit_task, transmit_task_cb(), update_flood_times(), update_network_size_estimate(), and verify_message_crypto().

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◆ handle_core_connect()

static void* handle_core_connect ( void *  cls,
const struct GNUNET_PeerIdentity peer,
struct GNUNET_MQ_Handle mq 
)
static

Method called whenever a peer connects.

Sets up the PeerEntry and schedules the initial size info transmission to this peer.

Parameters
clsclosure
peerpeer identity this notification is about

Definition at line 1174 of file gnunet-service-nse.c.

1177 {
1178  struct NSEPeerEntry *peer_entry;
1179 
1180  (void) cls;
1182  "Peer `%s' connected to us\n",
1183  GNUNET_i2s (peer));
1184  /* set our default transmission options */
1186  /* create our peer entry for this peer */
1187  peer_entry = GNUNET_new (struct NSEPeerEntry);
1188  peer_entry->id = peer;
1189  peer_entry->mq = mq;
1192  peers,
1193  peer_entry->id,
1194  peer_entry,
1196  peer_entry->transmit_task =
1199  peer_entry);
1200  GNUNET_STATISTICS_update (stats, "# peers connected", 1, GNUNET_NO);
1201  return peer_entry;
1202 }
#define NSE_PRIORITY
Message priority to use.
int GNUNET_CONTAINER_multipeermap_put(struct GNUNET_CONTAINER_MultiPeerMap *map, const struct GNUNET_PeerIdentity *key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
Store a key-value pair in the map.
@ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY
There must only be one value per key; storing a value should fail if a value under the same key alrea...
#define GNUNET_new(type)
Allocate a struct or union of the given type.
void GNUNET_MQ_set_options(struct GNUNET_MQ_Handle *mq, enum GNUNET_MQ_PriorityPreferences pp)
Set application-specific options for this queue.
Definition: mq.c:1083
struct GNUNET_TESTBED_Peer * peer
The peer associated with this model.

References get_transmit_delay(), GNUNET_assert, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY, GNUNET_CONTAINER_multipeermap_put(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_i2s(), GNUNET_log, GNUNET_MQ_set_options(), GNUNET_new, GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_add_delayed(), GNUNET_STATISTICS_update(), NSEPeerEntry::id, mq, NSEPeerEntry::mq, NSE_PRIORITY, peer, peers, stats, NSEPeerEntry::transmit_task, and transmit_task_cb().

Referenced by run().

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◆ handle_core_disconnect()

static void handle_core_disconnect ( void *  cls,
const struct GNUNET_PeerIdentity peer,
void *  internal_cls 
)
static

Method called whenever a peer disconnects.

Deletes the PeerEntry and cancels any pending transmission requests to that peer.

Parameters
clsclosure
peerpeer identity this notification is about @parma internal_cls the struct NSEPeerEntry for the peer

Definition at line 1214 of file gnunet-service-nse.c.

1217 {
1218  struct NSEPeerEntry *pos = internal_cls;
1219 
1220  (void) cls;
1222  "Peer `%s' disconnected from us\n",
1223  GNUNET_i2s (peer));
1226  if (NULL != pos->transmit_task)
1227  {
1229  pos->transmit_task = NULL;
1230  }
1231  GNUNET_free (pos);
1232  GNUNET_STATISTICS_update (stats, "# peers connected", -1, GNUNET_NO);
1233 }
int GNUNET_CONTAINER_multipeermap_remove(struct GNUNET_CONTAINER_MultiPeerMap *map, const struct GNUNET_PeerIdentity *key, const void *value)
Remove the given key-value pair from the map.

References GNUNET_assert, GNUNET_CONTAINER_multipeermap_remove(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_i2s(), GNUNET_log, GNUNET_NO, GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_update(), GNUNET_YES, peer, peers, stats, and NSEPeerEntry::transmit_task.

Referenced by run().

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◆ shutdown_task()

static void shutdown_task ( void *  cls)
static

Task run during shutdown.

Parameters
clsunused

Definition at line 1263 of file gnunet-service-nse.c.

1264 {
1265  (void) cls;
1266  if (NULL != flood_task)
1267  {
1269  flood_task = NULL;
1270  }
1271  if (NULL != proof_task)
1272  {
1274  proof_task = NULL;
1275  write_proof (); /* remember progress */
1276  }
1277  if (NULL != nc)
1278  {
1280  nc = NULL;
1281  }
1282  if (NULL != core_api)
1283  {
1285  core_api = NULL;
1286  }
1287  if (NULL != stats)
1288  {
1290  stats = NULL;
1291  }
1292  if (NULL != peers)
1293  {
1295  peers = NULL;
1296  }
1297  if (NULL != my_private_key)
1298  {
1300  my_private_key = NULL;
1301  }
1302 #if ENABLE_NSE_HISTOGRAM
1303  if (NULL != logger_test)
1304  {
1305  GNUNET_CLIENT_service_test_cancel (logger_test);
1306  logger_test = NULL;
1307  }
1308  if (NULL != lh)
1309  {
1310  GNUNET_TESTBED_LOGGER_flush (lh, &flush_comp_cb, NULL);
1311  }
1312  if (NULL != histogram)
1313  {
1314  GNUNET_BIO_write_close (histogram, NULL);
1315  histogram = NULL;
1316  }
1317 #endif
1318 }
static struct GNUNET_CORE_Handle * core_api
Handle to the core service.
int GNUNET_BIO_write_close(struct GNUNET_BIO_WriteHandle *h, char **emsg)
Close an IO handle.
Definition: bio.c:608
void GNUNET_CORE_disconnect(struct GNUNET_CORE_Handle *handle)
Disconnect from the core service.
Definition: core_api.c:730
void GNUNET_CONTAINER_multipeermap_destroy(struct GNUNET_CONTAINER_MultiPeerMap *map)
Destroy a hash map.
void GNUNET_notification_context_destroy(struct GNUNET_NotificationContext *nc)
Destroy the context, force disconnect for all subscribers.
Definition: nc.c:137
void GNUNET_STATISTICS_destroy(struct GNUNET_STATISTICS_Handle *h, int sync_first)
Destroy a handle (free all state associated with it).
void GNUNET_TESTBED_LOGGER_flush(struct GNUNET_TESTBED_LOGGER_Handle *h, GNUNET_TESTBED_LOGGER_FlushCompletion cb, void *cb_cls)
Flush the buffered data to the logger service.

References core_api, flood_task, GNUNET_BIO_write_close(), GNUNET_CONTAINER_multipeermap_destroy(), GNUNET_CORE_disconnect(), GNUNET_free, GNUNET_NO, GNUNET_notification_context_destroy(), GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_destroy(), GNUNET_TESTBED_LOGGER_flush(), my_private_key, nc, peers, proof_task, stats, and write_proof().

Referenced by run().

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◆ core_init()

static void core_init ( void *  cls,
const struct GNUNET_PeerIdentity identity 
)
static

Called on core init/fail.

Parameters
clsservice closure
identitythe public identity of this peer

Definition at line 1328 of file gnunet-service-nse.c.

1329 {
1330  struct GNUNET_TIME_Absolute now;
1331  struct GNUNET_TIME_Absolute prev_time;
1332 
1333  (void) cls;
1334  if (NULL == identity)
1335  {
1336  GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Connection to core FAILED!\n");
1338  return;
1339  }
1341  now = GNUNET_TIME_absolute_get ();
1343  (now.abs_value_us / gnunet_nse_interval.rel_value_us)
1345  next_timestamp =
1348  estimate_count = 0;
1350  {
1351  int idx = (estimate_index + HISTORY_SIZE - 1) % HISTORY_SIZE;
1352  prev_time.abs_value_us =
1354  setup_flood_message (idx, prev_time);
1356  estimate_count++;
1357  }
1358  flood_task =
1360 }
static struct GNUNET_IDENTITY_Handle * identity
Which namespace do we publish to? NULL if we do not publish to a namespace.
void GNUNET_SCHEDULER_shutdown(void)
Request the shutdown of a scheduler.
Definition: scheduler.c:531

References GNUNET_TIME_Absolute::abs_value_us, check_proof_of_work(), current_timestamp, estimate_count, estimate_index, flood_task, GNUNET_assert, GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_memcmp, gnunet_nse_interval, GNUNET_SCHEDULER_add_at(), GNUNET_SCHEDULER_shutdown(), GNUNET_TIME_absolute_add(), GNUNET_TIME_absolute_get(), GNUNET_YES, HISTORY_SIZE, identity, my_identity, my_proof, next_timestamp, GNUNET_PeerIdentity::public_key, GNUNET_TIME_Relative::rel_value_us, setup_flood_message(), and update_flood_message().

Referenced by run().

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◆ run()

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

Handle network size estimate clients.

Parameters
clsclosure
cconfiguration to use
servicethe initialized service

Definition at line 1402 of file gnunet-service-nse.c.

1405 {
1406  struct GNUNET_MQ_MessageHandler core_handlers[] =
1407  { GNUNET_MQ_hd_fixed_size (p2p_estimate,
1409  struct GNUNET_NSE_FloodMessage,
1410  NULL),
1411  GNUNET_MQ_handler_end () };
1412  char *proof;
1414 
1415  (void) cls;
1416  (void) service;
1417  cfg = c;
1419  "NSE",
1420  "INTERVAL",
1422  {
1425  return;
1426  }
1428  "NSE",
1429  "WORKDELAY",
1430  &proof_find_delay))
1431  {
1432  GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "NSE", "WORKDELAY");
1434  return;
1435  }
1437  "NSE",
1438  "WORKBITS",
1440  {
1443  return;
1444  }
1445  if (nse_work_required >= sizeof(struct GNUNET_HashCode) * 8)
1446  {
1448  "NSE",
1449  "WORKBITS",
1450  _ ("Value is too large.\n"));
1452  return;
1453  }
1454 
1455 #if ENABLE_NSE_HISTOGRAM
1456  {
1457  char *histogram_dir;
1458  char *histogram_fn;
1459 
1461  "NSE",
1462  "HISTOGRAM_DIR",
1463  &histogram_dir))
1464  {
1465  GNUNET_assert (
1466  0 < GNUNET_asprintf (&histogram_fn, "%s/timestamps", histogram_dir));
1467  GNUNET_free (histogram_dir);
1468  histogram = GNUNET_BIO_write_open_file (histogram_fn);
1469  if (NULL == histogram)
1471  "Unable to open histogram file `%s'\n",
1472  histogram_fn);
1473  GNUNET_free (histogram_fn);
1474  }
1475  logger_test = GNUNET_CLIENT_service_test ("testbed-logger",
1476  cfg,
1478  &status_cb,
1479  NULL);
1480  }
1481 #endif
1482 
1485  GNUNET_assert (NULL != pk);
1486  my_private_key = pk;
1488  if (GNUNET_OK !=
1489  GNUNET_CONFIGURATION_get_value_filename (cfg, "NSE", "PROOFFILE", &proof))
1490  {
1491  GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "NSE", "PROOFFILE");
1493  my_private_key = NULL;
1495  return;
1496  }
1497  if ((GNUNET_YES != GNUNET_DISK_file_test (proof)) ||
1498  (sizeof(my_proof) !=
1500  my_proof = 0;
1501  GNUNET_free (proof);
1502  proof_task =
1504  &find_proof,
1505  NULL);
1506 
1509  /* Connect to core service and register core handlers */
1510  core_api =
1511  GNUNET_CORE_connect (cfg, /* Main configuration */
1512  NULL, /* Closure passed to functions */
1513  &core_init, /* Call core_init once connected */
1514  &handle_core_connect, /* Handle connects */
1515  &handle_core_disconnect, /* Handle disconnects */
1516  core_handlers); /* Register these handlers */
1517  if (NULL == core_api)
1518  {
1520  return;
1521  }
1522  stats = GNUNET_STATISTICS_create ("nse", cfg);
1523 }
struct GNUNET_IDENTITY_PrivateKey pk
Private key from command line option, or NULL.
static struct GNUNET_SERVICE_Handle * service
Handle to our service instance.
static void core_init(void *cls, const struct GNUNET_PeerIdentity *identity)
Called on core init/fail.
static void shutdown_task(void *cls)
Task run during shutdown.
static void handle_core_disconnect(void *cls, const struct GNUNET_PeerIdentity *peer, void *internal_cls)
Method called whenever a peer disconnects.
static void * handle_core_connect(void *cls, const struct GNUNET_PeerIdentity *peer, struct GNUNET_MQ_Handle *mq)
Method called whenever a peer connects.
struct GNUNET_BIO_WriteHandle * GNUNET_BIO_write_open_file(const char *fn)
Open a file for writing.
Definition: bio.c:559
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_get_value_number(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, unsigned long long *number)
Get a configuration value that should be a number.
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_get_value_time(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, struct GNUNET_TIME_Relative *time)
Get a configuration value that should be a relative time.
struct GNUNET_CORE_Handle * GNUNET_CORE_connect(const struct GNUNET_CONFIGURATION_Handle *cfg, void *cls, GNUNET_CORE_StartupCallback init, GNUNET_CORE_ConnectEventHandler connects, GNUNET_CORE_DisconnectEventHandler disconnects, const struct GNUNET_MQ_MessageHandler *handlers)
Connect to the core service.
Definition: core_api.c:692
struct GNUNET_CRYPTO_EddsaPrivateKey * GNUNET_CRYPTO_eddsa_key_create_from_configuration(const struct GNUNET_CONFIGURATION_Handle *cfg)
Create a new private key by reading our peer's key from the file specified in the configuration.
void GNUNET_CRYPTO_eddsa_key_get_public(const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:197
enum GNUNET_GenericReturnValue GNUNET_DISK_file_test(const char *fil)
Check that fil corresponds to a filename (of a file that exists and that is not a directory).
Definition: disk.c:482
ssize_t GNUNET_DISK_fn_read(const char *fn, void *result, size_t len)
Read the contents of a binary file into a buffer.
Definition: disk.c:664
struct GNUNET_CONTAINER_MultiPeerMap * GNUNET_CONTAINER_multipeermap_create(unsigned int len, int do_not_copy_keys)
Create a multi peer map (hash map for public keys of peers).
void GNUNET_log_config_invalid(enum GNUNET_ErrorType kind, const char *section, const char *option, const char *required)
Log error message about invalid configuration option value.
void GNUNET_log_config_missing(enum GNUNET_ErrorType kind, const char *section, const char *option)
Log error message about missing configuration option.
int int GNUNET_asprintf(char **buf, const char *format,...) __attribute__((format(printf
Like asprintf, just portable.
#define GNUNET_MQ_handler_end()
End-marker for the handlers array.
struct GNUNET_NotificationContext * GNUNET_notification_context_create(unsigned int queue_length)
Create a new notification context.
Definition: nc.c:121
#define GNUNET_MQ_hd_fixed_size(name, code, str, ctx)
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_with_priority(enum GNUNET_SCHEDULER_Priority prio, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified priority.
Definition: scheduler.c:1223
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_shutdown(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run on shutdown, that is when a CTRL-C signal is received,...
Definition: scheduler.c:1331
struct GNUNET_STATISTICS_Handle * GNUNET_STATISTICS_create(const char *subsystem, const struct GNUNET_CONFIGURATION_Handle *cfg)
Get handle for the statistics service.
#define GNUNET_TIME_UNIT_SECONDS
One second.
#define _(String)
GNU gettext support macro.
Definition: platform.h:177
Private ECC key encoded for transmission.
Message handler for a specific message type.

References _, cfg, core_api, core_init(), find_proof(), GNUNET_asprintf(), GNUNET_assert, GNUNET_BIO_write_open_file(), GNUNET_CONFIGURATION_get_value_filename(), GNUNET_CONFIGURATION_get_value_number(), GNUNET_CONFIGURATION_get_value_time(), GNUNET_CONTAINER_multipeermap_create(), GNUNET_CORE_connect(), GNUNET_CRYPTO_eddsa_key_create_from_configuration(), GNUNET_CRYPTO_eddsa_key_get_public(), GNUNET_DISK_file_test(), GNUNET_DISK_fn_read(), GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_log_config_invalid(), GNUNET_log_config_missing(), GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD, GNUNET_MQ_handler_end, GNUNET_MQ_hd_fixed_size, GNUNET_notification_context_create(), gnunet_nse_interval, GNUNET_OK, GNUNET_SCHEDULER_add_shutdown(), GNUNET_SCHEDULER_add_with_priority(), GNUNET_SCHEDULER_PRIORITY_IDLE, GNUNET_SCHEDULER_shutdown(), GNUNET_STATISTICS_create(), GNUNET_TIME_UNIT_SECONDS, GNUNET_YES, handle_core_connect(), handle_core_disconnect(), my_identity, my_private_key, my_proof, nc, nse_work_required, peers, pk, proof, proof_find_delay, proof_task, GNUNET_PeerIdentity::public_key, service, shutdown_task(), and stats.

Here is the call graph for this function:

◆ client_connect_cb()

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

Callback called when a client connects to the service.

Parameters
clsclosure for the service
cthe new client that connected to the service
mqthe message queue used to send messages to the client
Returns
c

Definition at line 1535 of file gnunet-service-nse.c.

1538 {
1539  (void) cls;
1540  (void) mq;
1541  return c;
1542 }

References mq.

◆ client_disconnect_cb()

static void client_disconnect_cb ( void *  cls,
struct GNUNET_SERVICE_Client c,
void *  internal_cls 
)
static

Callback called when a client disconnected from the service.

Parameters
clsclosure for the service
cthe client that disconnected
internal_clsshould be equal to c

Definition at line 1553 of file gnunet-service-nse.c.

1556 {
1557  (void) cls;
1558  GNUNET_assert (c == internal_cls);
1559 }

References GNUNET_assert.

◆ GNUNET_SERVICE_MAIN()

GNUNET_SERVICE_MAIN ( "nse"  ,
GNUNET_SERVICE_OPTION_NONE  ,
run,
client_connect_cb,
client_disconnect_cb,
NULL  ,
GNUNET_MQ_hd_fixed_size(start, GNUNET_MESSAGE_TYPE_NSE_START, struct GNUNET_MessageHeader, NULL)  ,
GNUNET_MQ_handler_end()   
)

Define "main" method using service macro.

Variable Documentation

◆ nse_work_required

unsigned long long nse_work_required
static

Amount of work required (W-bit collisions) for NSE proofs, in collision-bits.

Definition at line 85 of file gnunet-service-nse.c.

Referenced by check_proof_of_work(), find_proof(), run(), setup_flood_message(), and verify_message_crypto().

◆ gnunet_nse_interval

struct GNUNET_TIME_Relative gnunet_nse_interval
static

Interval for sending network size estimation flood requests.

Definition at line 85 of file gnunet-service-nse.c.

Referenced by core_init(), get_delay_randomization(), handle_p2p_estimate(), run(), and update_flood_message().

◆ proof_find_delay

struct GNUNET_TIME_Relative proof_find_delay
static

Interval between proof find runs.

Definition at line 85 of file gnunet-service-nse.c.

Referenced by find_proof(), and run().

◆ salt

struct GNUNET_CRYPTO_PowSalt salt = { "gnunet-nse-proof" }
static

◆ cfg

Handle to our current configuration.

Definition at line 225 of file gnunet-service-nse.c.

Referenced by run(), and write_proof().

◆ stats

struct GNUNET_STATISTICS_Handle* stats
static

◆ core_api

struct GNUNET_CORE_Handle* core_api
static

Handle to the core service.

Definition at line 235 of file gnunet-service-nse.c.

Referenced by run(), and shutdown_task().

◆ peers

struct GNUNET_CONTAINER_MultiPeerMap* peers
static

◆ current_size_estimate

double current_size_estimate
static

The current network size estimate.

Number of bits matching on average thus far.

Definition at line 246 of file gnunet-service-nse.c.

Referenced by get_delay_randomization(), and setup_estimate_message().

◆ current_std_dev

double current_std_dev = NAN
static

The standard deviation of the last HISTORY_SIZE network size estimates.

Definition at line 252 of file gnunet-service-nse.c.

Referenced by setup_estimate_message().

◆ hop_count_max

uint32_t hop_count_max
static

Current hop counter estimate (estimate for network diameter).

Definition at line 257 of file gnunet-service-nse.c.

Referenced by handle_p2p_estimate(), and update_flood_message().

◆ next_message

struct GNUNET_NSE_FloodMessage next_message
static

Message for the next round, if we got any.

Definition at line 257 of file gnunet-service-nse.c.

Referenced by handle_p2p_estimate(), and update_flood_message().

◆ size_estimate_messages

struct GNUNET_NSE_FloodMessage size_estimate_messages[64]
static

Array of recent size estimate messages.

Definition at line 257 of file gnunet-service-nse.c.

Referenced by handle_p2p_estimate(), setup_estimate_message(), setup_flood_message(), transmit_task_cb(), and update_flood_message().

◆ estimate_index

unsigned int estimate_index
static

Index of most recent estimate.

Definition at line 272 of file gnunet-service-nse.c.

Referenced by core_init(), find_proof(), handle_p2p_estimate(), setup_estimate_message(), transmit_task_cb(), and update_flood_message().

◆ estimate_count

unsigned int estimate_count
static

Number of valid entries in the history.

Definition at line 277 of file gnunet-service-nse.c.

Referenced by core_init(), setup_estimate_message(), and update_flood_message().

◆ flood_task

struct GNUNET_SCHEDULER_Task* flood_task
static

Task scheduled to update our flood message for the next round.

Definition at line 282 of file gnunet-service-nse.c.

Referenced by core_init(), shutdown_task(), and update_flood_message().

◆ proof_task

struct GNUNET_SCHEDULER_Task* proof_task
static

Task scheduled to compute our proof.

Definition at line 287 of file gnunet-service-nse.c.

Referenced by find_proof(), run(), shutdown_task(), and transmit_task_cb().

◆ nc

struct GNUNET_NotificationContext* nc
static

Notification context, simplifies client broadcasts.

Definition at line 292 of file gnunet-service-nse.c.

Referenced by handle_start(), run(), shutdown_task(), and update_network_size_estimate().

◆ next_timestamp

struct GNUNET_TIME_Absolute next_timestamp
static

The next major time.

Definition at line 292 of file gnunet-service-nse.c.

Referenced by core_init(), handle_p2p_estimate(), and update_flood_message().

◆ current_timestamp

struct GNUNET_TIME_Absolute current_timestamp
static

The current major time.

Definition at line 292 of file gnunet-service-nse.c.

Referenced by core_init(), find_proof(), handle_p2p_estimate(), and update_flood_message().

◆ my_private_key

struct GNUNET_CRYPTO_EddsaPrivateKey* my_private_key
static

The private key of this peer.

Definition at line 307 of file gnunet-service-nse.c.

Referenced by run(), setup_flood_message(), and shutdown_task().

◆ my_identity

struct GNUNET_PeerIdentity my_identity
static

The peer identity of this peer.

Definition at line 307 of file gnunet-service-nse.c.

Referenced by core_init(), find_proof(), handle_p2p_estimate(), run(), setup_flood_message(), and update_flood_message().

◆ my_proof

uint64_t my_proof
static

Proof of work for this peer.

Definition at line 317 of file gnunet-service-nse.c.

Referenced by core_init(), find_proof(), run(), setup_flood_message(), and write_proof().