GNUnet  0.11.x
gnunet-service-nse.c
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1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2009, 2010, 2011, 2012, 2013, 2016 GNUnet e.V.
4 
5  GNUnet is free software: you can redistribute it and/or modify it
6  under the terms of the GNU Affero General Public License as published
7  by the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
10  GNUnet is distributed in the hope that it will be useful, but
11  WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  Affero General Public License for more details.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19  */
20 
38 #include "platform.h"
39 #include <math.h>
40 #include "gnunet_util_lib.h"
41 #include "gnunet_constants.h"
42 #include "gnunet_protocols.h"
43 #include "gnunet_signatures.h"
45 #include "gnunet_core_service.h"
46 #include "gnunet_nse_service.h"
47 #if ENABLE_NSE_HISTOGRAM
49 #endif
50 #include "nse.h"
51 #include <gcrypt.h>
52 
53 
58 #define USE_RANDOM_DELAYS GNUNET_YES
59 
63 #define DEBUG_NSE GNUNET_NO
64 
68 #define HISTORY_SIZE 64
69 
74 #define NSE_PRIORITY \
75  (GNUNET_MQ_PRIO_BACKGROUND | GNUNET_MQ_PREF_UNRELIABLE \
76  | GNUNET_MQ_PREF_CORK_ALLOWED)
77 
78 #ifdef BSD
79 #define log2(a) (log (a) / log (2))
80 #endif
81 
85 static unsigned long long nse_work_required;
86 
91 
96 
97 #if ENABLE_NSE_HISTOGRAM
98 
102 struct GNUNET_CLIENT_TestHandle *logger_test;
103 
107 static struct GNUNET_TESTBED_LOGGER_Handle *lh;
108 
112 static struct GNUNET_BIO_WriteHandle *histogram;
113 
114 #endif
115 
116 
121 {
126 
130  const struct GNUNET_PeerIdentity *id;
131 
136 
143 
144 #if ENABLE_NSE_HISTOGRAM
145 
148  unsigned int received_messages;
149 
153  unsigned int transmitted_messages;
154 
158  unsigned int last_transmitted_size;
159 #endif
160 };
161 
162 
164 
171 {
175  struct GNUNET_MessageHeader header;
176 
180  uint32_t hop_count GNUNET_PACKED;
181 
186 
191  struct GNUNET_TIME_AbsoluteNBO timestamp;
192 
199 
203  struct GNUNET_PeerIdentity origin;
204 
209 
214 };
216 
220 static const struct GNUNET_CONFIGURATION_Handle *cfg;
221 
226 
231 
236 
241 static double current_size_estimate;
242 
247 static double current_std_dev = NAN;
248 
252 static uint32_t hop_count_max;
253 
258 
263 
267 static unsigned int estimate_index;
268 
272 static unsigned int estimate_count;
273 
278 
283 
288 
293 
298 
303 
308 
312 static uint64_t my_proof;
313 
314 
321 static void
323 {
324  double mean;
325  double sum;
326  double std_dev;
327  double variance;
328  double val;
329  double nsize;
330 
331 #define WEST 1
332  /* Weighted incremental algorithm for stddev according to West (1979) */
333 #if WEST
334  double sumweight;
335  double weight;
336  double q;
337  double r;
338  double temp;
339 
340  mean = 0.0;
341  sum = 0.0;
342  sumweight = 0.0;
343  variance = 0.0;
344  for (unsigned int i = 0; i < estimate_count; i++)
345  {
346  unsigned int j = (estimate_index - i + HISTORY_SIZE) % HISTORY_SIZE;
347 
348  val = htonl (size_estimate_messages[j].matching_bits);
349  weight = estimate_count + 1 - i;
350 
351  temp = weight + sumweight;
352  q = val - mean;
353  r = q * weight / temp;
354  mean += r;
355  sum += sumweight * q * r;
356  sumweight = temp;
357  }
358  if (estimate_count > 0)
359  variance = (sum / sumweight) * estimate_count / (estimate_count - 1.0);
360 #else
361  /* trivial version for debugging */
362  double vsq;
363 
364  /* non-weighted trivial version */
365  sum = 0.0;
366  vsq = 0.0;
367  variance = 0.0;
368  mean = 0.0;
369 
370  for (unsigned int i = 0; i < estimate_count; i++)
371  {
372  unsigned int j = (estimate_index - i + HISTORY_SIZE) % HISTORY_SIZE;
373 
374  val = htonl (size_estimate_messages[j].matching_bits);
375  sum += val;
376  vsq += val * val;
377  }
378  if (0 != estimate_count)
379  {
380  mean = sum / estimate_count;
381  variance = (vsq - mean * sum)
382  / (estimate_count - 1.0); // terrible for numerical stability...
383  }
384 #endif
385  if (variance >= 0)
386  std_dev = sqrt (variance);
387  else
388  std_dev = variance; /* must be infinity due to estimate_count == 0 */
389  current_std_dev = std_dev;
390  current_size_estimate = mean;
391 
392  em->header.size = htons (sizeof(struct GNUNET_NSE_ClientMessage));
394  em->reserved = htonl (0);
396  {
397  double se = mean - 0.332747;
398  unsigned int j = GNUNET_CONTAINER_multipeermap_size (peers);
399  if (0 == j)
400  j = 1; /* Avoid log2(0); can only happen if CORE didn't report
401  connection to self yet */
402  nsize = log2 (j);
403  em->size_estimate = GNUNET_hton_double (GNUNET_MAX (se, nsize));
404  em->std_deviation = GNUNET_hton_double (std_dev);
405  GNUNET_STATISTICS_set (stats,
406  "# nodes in the network (estimate)",
407  (uint64_t) pow (2, GNUNET_MAX (se, nsize)),
408  GNUNET_NO);
409  }
410 }
411 
412 
422 static void
423 handle_start (void *cls, const struct GNUNET_MessageHeader *message)
424 {
425  struct GNUNET_SERVICE_Client *client = cls;
426  struct GNUNET_MQ_Handle *mq;
427  struct GNUNET_NSE_ClientMessage em;
428  struct GNUNET_MQ_Envelope *env;
429 
430  (void) message;
431  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received START message from client\n");
432  mq = GNUNET_SERVICE_client_get_mq (client);
435  env = GNUNET_MQ_msg_copy (&em.header);
436  GNUNET_MQ_send (mq, env);
438 }
439 
440 
447 static double
449 {
450  /* Calculated as: S + f/2 - (f / pi) * (atan(x - p')) */
451  // S is next_timestamp (ignored in return value)
452  // f is frequency (gnunet_nse_interval)
453  // x is matching_bits
454  // p' is current_size_estimate
455  return ((double) gnunet_nse_interval.rel_value_us / (double) 2.0)
457  * atan (matching_bits - current_size_estimate));
458 }
459 
460 
467 static struct GNUNET_TIME_Relative
469 {
470 #if USE_RANDOM_DELAYS
471  struct GNUNET_TIME_Relative ret;
472  uint32_t i;
473  double d;
474 
476  i = (uint32_t) (d / (double) (hop_count_max + 1));
477  ret.rel_value_us = i;
479  "Randomizing flood using latencies up to %s\n",
481  ret.rel_value_us =
483  return ret;
484 #else
485  return GNUNET_TIME_UNIT_ZERO;
486 #endif
487 }
488 
489 
497 static uint32_t
499  const struct GNUNET_PeerIdentity *id)
500 {
501  struct GNUNET_HashCode timestamp_hash;
502  struct GNUNET_HashCode pid_hash;
503 
504  GNUNET_CRYPTO_hash (&timestamp.abs_value_us,
505  sizeof(timestamp.abs_value_us),
506  &timestamp_hash);
507  GNUNET_CRYPTO_hash (id, sizeof(struct GNUNET_PeerIdentity), &pid_hash);
508  return GNUNET_CRYPTO_hash_matching_bits (&timestamp_hash, &pid_hash);
509 }
510 
511 
520 static struct GNUNET_TIME_Relative
521 get_transmit_delay (int round_offset)
522 {
523  struct GNUNET_TIME_Relative ret;
524  struct GNUNET_TIME_Absolute tgt;
525  double dist_delay;
526  uint32_t matching_bits;
527 
528  switch (round_offset)
529  {
530  case -1:
531  /* previous round is randomized between 0 and 50 ms */
532 #if USE_RANDOM_DELAYS
533  ret.rel_value_us =
535 #else
536  ret = GNUNET_TIME_UNIT_ZERO;
537 #endif
539  "Transmitting previous round behind schedule in %s\n",
541  return ret;
542 
543  case 0:
544  /* current round is based on best-known matching_bits */
545  matching_bits =
546  ntohl (size_estimate_messages[estimate_index].matching_bits);
547  dist_delay = get_matching_bits_delay (matching_bits);
548  dist_delay += get_delay_randomization (matching_bits).rel_value_us;
549  ret.rel_value_us = (uint64_t) dist_delay;
551  "For round %s, delay for %u matching bits is %s\n",
553  (unsigned int) matching_bits,
555  /* now consider round start time and add delay to it */
558  }
559  GNUNET_break (0);
561 }
562 
563 
569 static void
570 transmit_task_cb (void *cls)
571 {
572  struct NSEPeerEntry *peer_entry = cls;
573  unsigned int idx;
574  struct GNUNET_MQ_Envelope *env;
575 
576  peer_entry->transmit_task = NULL;
577  idx = estimate_index;
578  if (GNUNET_NO == peer_entry->previous_round)
579  {
580  idx = (idx + HISTORY_SIZE - 1) % HISTORY_SIZE;
581  peer_entry->previous_round = GNUNET_YES;
582  peer_entry->transmit_task =
585  peer_entry);
586  }
587  if ((0 == ntohl (size_estimate_messages[idx].hop_count)) &&
588  (NULL != proof_task))
589  {
591  "# flood messages not generated (no proof yet)",
592  1,
593  GNUNET_NO);
594  return;
595  }
596  if (0 == ntohs (size_estimate_messages[idx].header.size))
597  {
599  "# flood messages not generated (lack of history)",
600  1,
601  GNUNET_NO);
602  return;
603  }
605  "In round %s, sending to `%s' estimate with %u bits\n",
608  size_estimate_messages[idx].timestamp)),
609  GNUNET_i2s (peer_entry->id),
610  (unsigned int) ntohl (size_estimate_messages[idx].matching_bits));
611  if (0 == ntohl (size_estimate_messages[idx].hop_count))
612  GNUNET_STATISTICS_update (stats, "# flood messages started", 1, GNUNET_NO);
614  "# flood messages transmitted",
615  1,
616  GNUNET_NO);
617 #if ENABLE_NSE_HISTOGRAM
618  peer_entry->transmitted_messages++;
619  peer_entry->last_transmitted_size =
620  ntohl (size_estimate_messages[idx].matching_bits);
621 #endif
622  env = GNUNET_MQ_msg_copy (&size_estimate_messages[idx].header);
623  GNUNET_MQ_send (peer_entry->mq, env);
624 }
625 
626 
633 static void
635 {
636  struct GNUNET_NSE_ClientMessage em;
637 
640 }
641 
642 
650 static void
651 setup_flood_message (unsigned int slot, struct GNUNET_TIME_Absolute ts)
652 {
653  struct GNUNET_NSE_FloodMessage *fm;
654  uint32_t matching_bits;
655 
656  matching_bits = get_matching_bits (ts, &my_identity);
657  fm = &size_estimate_messages[slot];
658  fm->header.size = htons (sizeof(struct GNUNET_NSE_FloodMessage));
660  fm->hop_count = htonl (0);
662  fm->purpose.size =
663  htonl (sizeof(struct GNUNET_NSE_FloodMessage)
664  - sizeof(struct GNUNET_MessageHeader) - sizeof(uint32_t)
665  - sizeof(struct GNUNET_CRYPTO_EddsaSignature));
666  fm->matching_bits = htonl (matching_bits);
668  fm->origin = my_identity;
669  fm->proof_of_work = my_proof;
670  if (nse_work_required > 0)
672  GNUNET_CRYPTO_eddsa_sign_ (my_private_key,
673  &fm->purpose,
674  &fm->signature));
675  else
676  memset (&fm->signature, 0, sizeof(fm->signature));
677 }
678 
679 
689 static int
691  const struct GNUNET_PeerIdentity *key,
692  void *value)
693 {
694  struct NSEPeerEntry *peer_entry = value;
695  struct GNUNET_TIME_Relative delay;
696 
697  (void) cls;
698  (void) key;
699  if (NULL != peer_entry->transmit_task)
700  {
702  peer_entry->previous_round = GNUNET_NO;
703  }
704 #if ENABLE_NSE_HISTOGRAM
705  if (peer_entry->received_messages > 1)
707  "# extra messages",
708  peer_entry->received_messages - 1,
709  GNUNET_NO);
710  peer_entry->transmitted_messages = 0;
711  peer_entry->last_transmitted_size = 0;
712  peer_entry->received_messages = 0;
713 #endif
714  delay =
715  get_transmit_delay ((GNUNET_NO == peer_entry->previous_round) ? -1 : 0);
716  peer_entry->transmit_task =
717  GNUNET_SCHEDULER_add_delayed (delay, &transmit_task_cb, peer_entry);
718  return GNUNET_OK;
719 }
720 
721 
727 static void
729 {
730  struct GNUNET_TIME_Relative offset;
731 
732  (void) cls;
733  flood_task = NULL;
735  if (0 != offset.rel_value_us)
736  {
737  /* somehow run early, delay more */
738  flood_task =
740  return;
741  }
744  estimate_count++;
751  ntohl (next_message.matching_bits)))
752  {
753  /* we received a message for this round way early, use it! */
756  htonl (1 + ntohl (next_message.hop_count));
757  }
758  else
760  next_message.matching_bits = htonl (0); /* reset for 'next' round */
761  hop_count_max = 0;
762  for (unsigned int i = 0; i < HISTORY_SIZE; i++)
763  hop_count_max =
764  GNUNET_MAX (ntohl (size_estimate_messages[i].hop_count), hop_count_max);
766  flood_task =
768 }
769 
770 
777 static unsigned int
779 {
780  unsigned int hash_count;
781 
782  hash_count = 0;
783  while (0 == GNUNET_CRYPTO_hash_get_bit_ltr (hash, hash_count))
784  hash_count++;
785  return hash_count;
786 }
787 
788 
797 static int
799  uint64_t val)
800 {
801  char buf[sizeof(struct GNUNET_CRYPTO_EddsaPublicKey)
802  + sizeof(val)] GNUNET_ALIGN;
803  struct GNUNET_HashCode result;
804 
805  GNUNET_memcpy (buf, &val, sizeof(val));
806  GNUNET_memcpy (&buf[sizeof(val)],
807  pkey,
808  sizeof(struct GNUNET_CRYPTO_EddsaPublicKey));
809  GNUNET_CRYPTO_pow_hash ("gnunet-nse-proof",
810  buf,
811  sizeof(buf),
812  &result);
813  return (count_leading_zeroes (&result) >= nse_work_required) ? GNUNET_YES
814  : GNUNET_NO;
815 }
816 
817 
821 static void
823 {
824  char *proof;
825 
826  if (GNUNET_OK !=
827  GNUNET_CONFIGURATION_get_value_filename (cfg, "NSE", "PROOFFILE", &proof))
828  return;
829  if (sizeof(my_proof) != GNUNET_DISK_fn_write (proof,
830  &my_proof,
831  sizeof(my_proof),
835  GNUNET_free (proof);
836 }
837 
838 
844 static void
845 find_proof (void *cls)
846 {
847 #define ROUND_SIZE 10
848  uint64_t counter;
849  char buf[sizeof(struct GNUNET_CRYPTO_EddsaPublicKey)
850  + sizeof(uint64_t)] GNUNET_ALIGN;
851  struct GNUNET_HashCode result;
852  unsigned int i;
853 
854  (void) cls;
855  proof_task = NULL;
856  GNUNET_memcpy (&buf[sizeof(uint64_t)],
857  &my_identity,
858  sizeof(struct GNUNET_PeerIdentity));
859  i = 0;
860  counter = my_proof;
861  while ((counter != UINT64_MAX) && (i < ROUND_SIZE))
862  {
863  GNUNET_memcpy (buf, &counter, sizeof(uint64_t));
864  GNUNET_CRYPTO_pow_hash ("gnunet-nse-proof",
865  buf,
866  sizeof(buf),
867  &result);
868  if (nse_work_required <= count_leading_zeroes (&result))
869  {
870  my_proof = counter;
872  "Proof of work found: %llu!\n",
873  (unsigned long long) GNUNET_ntohll (counter));
874  write_proof ();
876  return;
877  }
878  counter++;
879  i++;
880  }
881  if (my_proof / (100 * ROUND_SIZE) < counter / (100 * ROUND_SIZE))
882  {
884  "Testing proofs currently at %llu\n",
885  (unsigned long long) counter);
886  /* remember progress every 100 rounds */
887  my_proof = counter;
888  write_proof ();
889  }
890  else
891  {
892  my_proof = counter;
893  }
894  proof_task =
897  &find_proof,
898  NULL);
899 }
900 
901 
911 static int
912 verify_message_crypto (const struct GNUNET_NSE_FloodMessage *incoming_flood)
913 {
914  if (GNUNET_YES != check_proof_of_work (&incoming_flood->origin.public_key,
915  incoming_flood->proof_of_work))
916  {
918  "Proof of work invalid: %llu!\n",
919  (unsigned long long) GNUNET_ntohll (
920  incoming_flood->proof_of_work));
921  GNUNET_break_op (0);
922  return GNUNET_NO;
923  }
924  if ((nse_work_required > 0) &&
925  (GNUNET_OK !=
927  &incoming_flood->purpose,
928  &incoming_flood->signature,
929  &incoming_flood->origin.public_key)))
930  {
931  GNUNET_break_op (0);
932  return GNUNET_NO;
933  }
934  return GNUNET_YES;
935 }
936 
937 
947 static int
949  const struct GNUNET_PeerIdentity *key,
950  void *value)
951 {
952  struct NSEPeerEntry *exclude = cls;
953  struct NSEPeerEntry *peer_entry = value;
954  struct GNUNET_TIME_Relative delay;
955 
956  (void) key;
957  if (peer_entry == exclude)
958  return GNUNET_OK; /* trigger of the update */
959  if (GNUNET_NO == peer_entry->previous_round)
960  {
961  /* still stuck in previous round, no point to update, check that
962  * we are active here though... */
963  if (NULL == peer_entry->transmit_task)
964  {
965  GNUNET_break (0);
966  }
967  return GNUNET_OK;
968  }
969  if (NULL != peer_entry->transmit_task)
970  {
972  peer_entry->transmit_task = NULL;
973  }
974  delay = get_transmit_delay (0);
975  peer_entry->transmit_task =
976  GNUNET_SCHEDULER_add_delayed (delay, &transmit_task_cb, peer_entry);
977  return GNUNET_OK;
978 }
979 
980 
987 static void
989  const struct GNUNET_NSE_FloodMessage *incoming_flood)
990 {
991  struct NSEPeerEntry *peer_entry = cls;
992  struct GNUNET_TIME_Absolute ts;
993  uint32_t matching_bits;
994  unsigned int idx;
995 
996 #if ENABLE_NSE_HISTOGRAM
997  {
998  uint64_t t;
999 
1001  if (NULL != lh)
1002  GNUNET_TESTBED_LOGGER_write (lh, &t, sizeof(uint64_t));
1003  if (NULL != histogram)
1004  GNUNET_BIO_write_int64 (histogram, "histogram-time", t);
1005  }
1006 #endif
1007  GNUNET_STATISTICS_update (stats, "# flood messages received", 1, GNUNET_NO);
1008  matching_bits = ntohl (incoming_flood->matching_bits);
1009 #if DEBUG_NSE
1010  {
1011  char origin[5];
1012  char pred[5];
1013  struct GNUNET_PeerIdentity os;
1014 
1015  GNUNET_snprintf (origin,
1016  sizeof(origin),
1017  "%s",
1018  GNUNET_i2s (&incoming_flood->origin));
1019  GNUNET_snprintf (pred, sizeof(pred), "%s", GNUNET_i2s (peer_entry->id));
1021  "Flood at %s from `%s' via `%s' at `%s' with bits %u\n",
1023  GNUNET_TIME_absolute_ntoh (incoming_flood->timestamp)),
1024  origin,
1025  pred,
1027  (unsigned int) matching_bits);
1028  }
1029 #endif
1030 
1031 #if ENABLE_NSE_HISTOGRAM
1032  peer_entry->received_messages++;
1033  if ((peer_entry->transmitted_messages > 0) &&
1034  (peer_entry->last_transmitted_size >= matching_bits) )
1035  GNUNET_STATISTICS_update (stats, "# cross messages", 1, GNUNET_NO);
1036 #endif
1037 
1038  ts = GNUNET_TIME_absolute_ntoh (incoming_flood->timestamp);
1040  idx = estimate_index;
1041  else if (ts.abs_value_us ==
1043  idx = (estimate_index + HISTORY_SIZE - 1) % HISTORY_SIZE;
1044  else if (ts.abs_value_us == next_timestamp.abs_value_us)
1045  {
1046  if (matching_bits <= ntohl (next_message.matching_bits))
1047  return; /* ignore, simply too early/late */
1048  if (GNUNET_YES != verify_message_crypto (incoming_flood))
1049  {
1051  "Peer %s is likely ill-configured!\n",
1052  GNUNET_i2s (peer_entry->id));
1053  GNUNET_break_op (0);
1054  return;
1055  }
1056  next_message = *incoming_flood;
1057  return;
1058  }
1059  else
1060  {
1061  GNUNET_STATISTICS_update (stats,
1062  "# flood messages discarded (clock skew too large)",
1063  1,
1064  GNUNET_NO);
1065  return;
1066  }
1067  if (0 == (GNUNET_memcmp (peer_entry->id, &my_identity)))
1068  {
1069  /* send to self, update our own estimate IF this also comes from us! */
1070  if (0 == GNUNET_memcmp (&incoming_flood->origin, &my_identity))
1072  return;
1073  }
1074  if (matching_bits == ntohl (size_estimate_messages[idx].matching_bits))
1075  {
1076  /* Cancel transmission in the other direction, as this peer clearly has
1077  up-to-date information already. Even if we didn't talk to this peer in
1078  the previous round, we should no longer send it stale information as it
1079  told us about the current round! */
1080  peer_entry->previous_round = GNUNET_YES;
1081  if (idx != estimate_index)
1082  {
1083  /* do not transmit information for the previous round to this peer
1084  anymore (but allow current round) */
1085  return;
1086  }
1087  /* got up-to-date information for current round, cancel transmission to
1088  * this peer altogether */
1089  if (NULL != peer_entry->transmit_task)
1090  {
1091  GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
1092  peer_entry->transmit_task = NULL;
1093  }
1094  return;
1095  }
1096  if (matching_bits < ntohl (size_estimate_messages[idx].matching_bits))
1097  {
1098  if ((idx < estimate_index) && (peer_entry->previous_round == GNUNET_YES))
1099  {
1100  peer_entry->previous_round = GNUNET_NO;
1101  }
1102  /* push back our result now, that peer is spreading bad information... */
1103  if (NULL != peer_entry->transmit_task)
1104  GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
1105  peer_entry->transmit_task =
1107  /* Not closer than our most recent message, no need to do work here */
1108  GNUNET_STATISTICS_update (stats,
1109  "# flood messages ignored (had closer already)",
1110  1,
1111  GNUNET_NO);
1112  return;
1113  }
1114  if (GNUNET_YES != verify_message_crypto (incoming_flood))
1115  {
1116  GNUNET_break_op (0);
1117  return;
1118  }
1119  GNUNET_assert (matching_bits >
1120  ntohl (size_estimate_messages[idx].matching_bits));
1121  /* Cancel transmission in the other direction, as this peer clearly has
1122  * up-to-date information already.
1123  */
1124  peer_entry->previous_round = GNUNET_YES;
1125  if (idx == estimate_index)
1126  {
1127  /* cancel any activity for current round */
1128  if (NULL != peer_entry->transmit_task)
1129  {
1130  GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
1131  peer_entry->transmit_task = NULL;
1132  }
1133  }
1134  size_estimate_messages[idx] = *incoming_flood;
1136  htonl (ntohl (incoming_flood->hop_count) + 1);
1137  hop_count_max =
1138  GNUNET_MAX (ntohl (incoming_flood->hop_count) + 1, hop_count_max);
1139  GNUNET_STATISTICS_set (stats,
1140  "# estimated network diameter",
1141  hop_count_max,
1142  GNUNET_NO);
1143 
1144  /* have a new, better size estimate, inform clients */
1146 
1147  /* flood to rest */
1150  peer_entry);
1151 }
1152 
1153 
1161 static void *
1163  const struct GNUNET_PeerIdentity *peer,
1164  struct GNUNET_MQ_Handle *mq)
1165 {
1166  struct NSEPeerEntry *peer_entry;
1167 
1168  (void) cls;
1170  "Peer `%s' connected to us\n",
1171  GNUNET_i2s (peer));
1172  /* set our default transmission options */
1174  /* create our peer entry for this peer */
1175  peer_entry = GNUNET_new (struct NSEPeerEntry);
1176  peer_entry->id = peer;
1177  peer_entry->mq = mq;
1180  peers,
1181  peer_entry->id,
1182  peer_entry,
1184  peer_entry->transmit_task =
1187  peer_entry);
1188  GNUNET_STATISTICS_update (stats, "# peers connected", 1, GNUNET_NO);
1189  return peer_entry;
1190 }
1191 
1192 
1201 static void
1203  const struct GNUNET_PeerIdentity *peer,
1204  void *internal_cls)
1205 {
1206  struct NSEPeerEntry *pos = internal_cls;
1207 
1208  (void) cls;
1210  "Peer `%s' disconnected from us\n",
1211  GNUNET_i2s (peer));
1213  GNUNET_CONTAINER_multipeermap_remove (peers, peer, pos));
1214  if (NULL != pos->transmit_task)
1215  {
1217  pos->transmit_task = NULL;
1218  }
1219  GNUNET_free (pos);
1220  GNUNET_STATISTICS_update (stats, "# peers connected", -1, GNUNET_NO);
1221 }
1222 
1223 
1224 #if ENABLE_NSE_HISTOGRAM
1225 
1232 static void
1233 flush_comp_cb (void *cls, size_t size)
1234 {
1235  (void) cls;
1236  (void) size;
1238  lh = NULL;
1239 }
1240 
1241 
1242 #endif
1243 
1244 
1250 static void
1251 shutdown_task (void *cls)
1252 {
1253  (void) cls;
1254  if (NULL != flood_task)
1255  {
1256  GNUNET_SCHEDULER_cancel (flood_task);
1257  flood_task = NULL;
1258  }
1259  if (NULL != proof_task)
1260  {
1261  GNUNET_SCHEDULER_cancel (proof_task);
1262  proof_task = NULL;
1263  write_proof (); /* remember progress */
1264  }
1265  if (NULL != nc)
1266  {
1268  nc = NULL;
1269  }
1270  if (NULL != core_api)
1271  {
1272  GNUNET_CORE_disconnect (core_api);
1273  core_api = NULL;
1274  }
1275  if (NULL != stats)
1276  {
1278  stats = NULL;
1279  }
1280  if (NULL != peers)
1281  {
1283  peers = NULL;
1284  }
1285  if (NULL != my_private_key)
1286  {
1287  GNUNET_free (my_private_key);
1288  my_private_key = NULL;
1289  }
1290 #if ENABLE_NSE_HISTOGRAM
1291  if (NULL != logger_test)
1292  {
1293  GNUNET_CLIENT_service_test_cancel (logger_test);
1294  logger_test = NULL;
1295  }
1296  if (NULL != lh)
1297  {
1298  GNUNET_TESTBED_LOGGER_flush (lh, &flush_comp_cb, NULL);
1299  }
1300  if (NULL != histogram)
1301  {
1302  GNUNET_BIO_write_close (histogram, NULL);
1303  histogram = NULL;
1304  }
1305 #endif
1306 }
1307 
1308 
1315 static void
1316 core_init (void *cls, const struct GNUNET_PeerIdentity *identity)
1317 {
1318  struct GNUNET_TIME_Absolute now;
1319  struct GNUNET_TIME_Absolute prev_time;
1320 
1321  (void) cls;
1322  if (NULL == identity)
1323  {
1324  GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Connection to core FAILED!\n");
1326  return;
1327  }
1328  GNUNET_assert (0 == GNUNET_memcmp (&my_identity, identity));
1329  now = GNUNET_TIME_absolute_get ();
1333  next_timestamp =
1336  estimate_count = 0;
1338  {
1339  int idx = (estimate_index + HISTORY_SIZE - 1) % HISTORY_SIZE;
1340  prev_time.abs_value_us =
1342  setup_flood_message (idx, prev_time);
1344  estimate_count++;
1345  }
1346  flood_task =
1348 }
1349 
1350 
1351 #if ENABLE_NSE_HISTOGRAM
1352 
1360 static void
1361 status_cb (void *cls, int status)
1362 {
1363  (void) cls;
1364  logger_test = NULL;
1365  if (GNUNET_YES != status)
1366  {
1367  GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Testbed logger not running\n");
1368  return;
1369  }
1370  if (NULL == (lh = GNUNET_TESTBED_LOGGER_connect (cfg)))
1371  {
1373  "Cannot connect to the testbed logger. Exiting.\n");
1375  }
1376 }
1377 
1378 
1379 #endif
1380 
1381 
1389 static void
1390 run (void *cls,
1391  const struct GNUNET_CONFIGURATION_Handle *c,
1393 {
1394  struct GNUNET_MQ_MessageHandler core_handlers[] =
1395  { GNUNET_MQ_hd_fixed_size (p2p_estimate,
1397  struct GNUNET_NSE_FloodMessage,
1398  NULL),
1399  GNUNET_MQ_handler_end () };
1400  char *proof;
1402 
1403  (void) cls;
1404  (void) service;
1405  cfg = c;
1407  "NSE",
1408  "INTERVAL",
1410  {
1413  return;
1414  }
1416  "NSE",
1417  "WORKDELAY",
1418  &proof_find_delay))
1419  {
1420  GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "NSE", "WORKDELAY");
1422  return;
1423  }
1425  "NSE",
1426  "WORKBITS",
1428  {
1431  return;
1432  }
1433  if (nse_work_required >= sizeof(struct GNUNET_HashCode) * 8)
1434  {
1436  "NSE",
1437  "WORKBITS",
1438  _ ("Value is too large.\n"));
1440  return;
1441  }
1442 
1443 #if ENABLE_NSE_HISTOGRAM
1444  {
1445  char *histogram_dir;
1446  char *histogram_fn;
1447 
1449  "NSE",
1450  "HISTOGRAM_DIR",
1451  &histogram_dir))
1452  {
1453  GNUNET_assert (
1454  0 < GNUNET_asprintf (&histogram_fn, "%s/timestamps", histogram_dir));
1455  GNUNET_free (histogram_dir);
1456  histogram = GNUNET_BIO_write_open_file (histogram_fn);
1457  if (NULL == histogram)
1459  "Unable to open histogram file `%s'\n",
1460  histogram_fn);
1461  GNUNET_free (histogram_fn);
1462  }
1463  logger_test = GNUNET_CLIENT_service_test ("testbed-logger",
1464  cfg,
1466  &status_cb,
1467  NULL);
1468  }
1469 #endif
1470 
1473  GNUNET_assert (NULL != pk);
1474  my_private_key = pk;
1476  if (GNUNET_OK !=
1477  GNUNET_CONFIGURATION_get_value_filename (cfg, "NSE", "PROOFFILE", &proof))
1478  {
1479  GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "NSE", "PROOFFILE");
1480  GNUNET_free (my_private_key);
1481  my_private_key = NULL;
1483  return;
1484  }
1485  if ((GNUNET_YES != GNUNET_DISK_file_test (proof)) ||
1486  (sizeof(my_proof) !=
1487  GNUNET_DISK_fn_read (proof, &my_proof, sizeof(my_proof))))
1488  my_proof = 0;
1489  GNUNET_free (proof);
1490  proof_task =
1492  &find_proof,
1493  NULL);
1494 
1497  /* Connect to core service and register core handlers */
1498  core_api =
1499  GNUNET_CORE_connect (cfg, /* Main configuration */
1500  NULL, /* Closure passed to functions */
1501  &core_init, /* Call core_init once connected */
1502  &handle_core_connect, /* Handle connects */
1503  &handle_core_disconnect, /* Handle disconnects */
1504  core_handlers); /* Register these handlers */
1505  if (NULL == core_api)
1506  {
1508  return;
1509  }
1510  stats = GNUNET_STATISTICS_create ("nse", cfg);
1511 }
1512 
1513 
1522 static void *
1524  struct GNUNET_SERVICE_Client *c,
1525  struct GNUNET_MQ_Handle *mq)
1526 {
1527  (void) cls;
1528  (void) mq;
1529  return c;
1530 }
1531 
1532 
1540 static void
1542  struct GNUNET_SERVICE_Client *c,
1543  void *internal_cls)
1544 {
1545  (void) cls;
1546  GNUNET_assert (c == internal_cls);
1547 }
1548 
1549 
1553 GNUNET_SERVICE_MAIN ("nse",
1555  &run,
1558  NULL,
1561  struct GNUNET_MessageHeader,
1562  NULL),
1564 
1565 
1566 #if defined(__linux__) && defined(__GLIBC__)
1567 #include <malloc.h>
1568 
1572 void __attribute__ ((constructor))
1573 GNUNET_ARM_memory_init ()
1574 {
1575  mallopt (M_TRIM_THRESHOLD, 4 * 1024);
1576  mallopt (M_TOP_PAD, 1 * 1024);
1577  malloc_trim (0);
1578 }
1579 
1580 
1581 #endif
1582 
1583 
1584 /* end of gnunet-service-nse.c */
#define GNUNET_MESSAGE_TYPE_NSE_START
client->service message indicating start
int 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:544
static struct GNUNET_SERVICE_Handle * service
Handle to our service instance.
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:662
The notification context is the key datastructure for a convenience API used for transmission of noti...
Definition: nc.c:75
int previous_round
Did we receive or send a message about the previous round to this peer yet? GNUNET_YES if the previou...
int 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_TIME_Absolute GNUNET_TIME_absolute_ntoh(struct GNUNET_TIME_AbsoluteNBO a)
Convert absolute time from network byte order.
Definition: time.c:673
static void shutdown_task(void *cls)
Task run during shutdown.
int 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.
static struct GNUNET_REVOCATION_PowP proof_of_work
Proof-of-work object.
uint64_t rel_value_us
The actual value.
static struct GNUNET_TIME_Relative get_transmit_delay(int round_offset)
Get the transmission delay that should be applied for a particular round.
static char * pkey
Public key of the zone to look in, in ASCII.
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...
const struct GNUNET_PeerIdentity * id
What is the identity of the peer?
static struct GNUNET_TIME_Relative proof_find_delay
Interval between proof find runs.
Context for the core service connection.
Definition: core_api.c:77
uint32_t purpose
What does this signature vouch for? This must contain a GNUNET_SIGNATURE_PURPOSE_XXX constant (from g...
static void handle_core_disconnect(void *cls, const struct GNUNET_PeerIdentity *peer, void *internal_cls)
Method called whenever a peer disconnects.
Handle to a service.
Definition: service.c:116
int GNUNET_snprintf(char *buf, size_t size, const char *format,...)
Like snprintf, just aborts if the buffer is of insufficient size.
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
struct GNUNET_MQ_Handle * GNUNET_SERVICE_client_get_mq(struct GNUNET_SERVICE_Client *c)
Obtain the message queue of c.
Definition: service.c:2436
struct GNUNET_TIME_AbsoluteNBO timestamp
Timestamp at which the server received the message.
Definition: nse.h:57
uint64_t GNUNET_CRYPTO_random_u64(enum GNUNET_CRYPTO_Quality mode, uint64_t max)
Random on unsigned 64-bit values.
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, or when GNUNET_SCHEDULER_shutdown() is being invoked.
Definition: scheduler.c:1331
struct GNUNET_CRYPTO_EcdsaPrivateKey pk
Private key from command line option, or NULL.
int GNUNET_BIO_write_int64(struct GNUNET_BIO_WriteHandle *h, const char *what, int64_t i)
Write an (u)int64_t.
Definition: bio.c:955
struct GNUNET_STATISTICS_Handle * GNUNET_STATISTICS_create(const char *subsystem, const struct GNUNET_CONFIGURATION_Handle *cfg)
Get handle for the statistics service.
static int start
Set if we are to start default services (including ARM).
Definition: gnunet-arm.c:39
static struct GNUNET_CONTAINER_MultiPeerMap * peers
Map of all connected peers.
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:289
static struct GNUNET_SCHEDULER_Task * proof_task
Task scheduled to compute our proof.
uint32_t GNUNET_CRYPTO_random_u32(enum GNUNET_CRYPTO_Quality mode, uint32_t i)
Produce a random value.
#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_TIME_UNIT_SECONDS
One second.
struct GNUNET_TESTBED_LOGGER_Handle * GNUNET_TESTBED_LOGGER_connect(const struct GNUNET_CONFIGURATION_Handle *cfg)
Connect to the testbed logger service.
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:819
static struct GNUNET_SCHEDULER_Task * flood_task
Task scheduled to update our flood message for the next round.
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_NSE_ESTIMATE.
Definition: nse.h:47
uint32_t matching_bits
Number of matching bits between the hash of timestamp and the initiator&#39;s public key.
static struct GNUNET_NSE_FloodMessage next_message
Message for the next round, if we got any.
Network size estimate sent from the service to clients.
Definition: nse.h:42
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
#define GNUNET_MQ_hd_fixed_size(name, code, str, ctx)
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
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...
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.
#define HISTORY_SIZE
Over how many values do we calculate the weighted average?
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:395
#define GNUNET_new(type)
Allocate a struct or union of the given type.
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.
static struct GNUNET_SCHEDULER_Task * t
Main task.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
static struct GNUNET_PeerIdentity my_identity
The peer identity of this peer.
#define GNUNET_MESSAGE_TYPE_NSE_ESTIMATE
service->client message indicating
void GNUNET_STATISTICS_destroy(struct GNUNET_STATISTICS_Handle *h, int sync_first)
Destroy a handle (free all state associated with it).
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_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_SCHEDULER_shutdown(void)
Request the shutdown of a scheduler.
Definition: scheduler.c:531
static struct GNUNET_TIME_Relative gnunet_nse_interval
Interval for sending network size estimation flood requests.
Handle for the service.
static void run(void *cls, const struct GNUNET_CONFIGURATION_Handle *c, struct GNUNET_SERVICE_Handle *service)
Handle network size estimate clients.
static unsigned long long nse_work_required
Amount of work required (W-bit collisions) for NSE proofs, in collision-bits.
Time for absolute time used by GNUnet, in microseconds and in network byte order. ...
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
uint64_t abs_value_us
The actual value.
ssize_t GNUNET_DISK_fn_write(const char *fn, const void *buffer, size_t n, enum GNUNET_DISK_AccessPermissions mode)
Write a buffer to a file.
Definition: disk.c:879
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.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
#define GNUNET_NETWORK_STRUCT_BEGIN
Define as empty, GNUNET_PACKED should suffice, but this won&#39;t work on W32.
static void transmit_task_cb(void *cls)
Task that triggers a NSE P2P transmission.
void GNUNET_CONTAINER_multipeermap_destroy(struct GNUNET_CONTAINER_MultiPeerMap *map)
Destroy a hash map.
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.
#define _(String)
GNU gettext support macro.
Definition: platform.h:184
Handle to a client that is connected to a service.
Definition: service.c:250
static void client_disconnect_cb(void *cls, struct GNUNET_SERVICE_Client *c, void *internal_cls)
Callback called when a client disconnected from the service.
static void write_proof()
Write our current proof to disk.
header of what an ECC signature signs this must be followed by "size - 8" bytes of the actual signed ...
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?
int GNUNET_asprintf(char **buf, const char *format,...)
Like asprintf, just portable.
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
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
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
static uint32_t hop_count_max
Current hop counter estimate (estimate for network diameter).
struct GNUNET_CRYPTO_EddsaSignature signature
Signature (over range specified in purpose).
void GNUNET_log_config_missing(enum GNUNET_ErrorType kind, const char *section, const char *option)
Log error message about missing configuration option.
static char * value
Value of the record to add/remove.
static uint64_t proof
Definition: gnunet-scrypt.c:41
Network size estimate reply; sent when "this" peer&#39;s timer has run out before receiving a valid reply...
#define GNUNET_log_strerror_file(level, cmd, filename)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:48
double std_deviation
The standard deviation (rounded down to the nearest integer) of size estimations. ...
Definition: nse.h:69
#define GNUNET_MAX(a, b)
Definition: gnunet_common.h:95
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
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.
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:701
static void find_proof(void *cls)
Find our proof of work.
static unsigned int estimate_index
Index of most recent estimate.
static double current_size_estimate
The current network size estimate.
uint16_t status
See PRISM_STATUS_*-constants.
static struct GNUNET_NotificationContext * nc
Notification context, simplifies client broadcasts.
static char buf[2048]
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
static struct GNUNET_NSE_FloodMessage size_estimate_messages[64]
Array of recent size estimate messages.
Handle for buffered writing.
Definition: bio.c:515
uint32_t size
How many bytes does this signature sign? (including this purpose header); in network byte order (!)...
Internal representation of the hash map.
struct GNUNET_PeerIdentity origin
Public key of the originator.
void GNUNET_STATISTICS_set(struct GNUNET_STATISTICS_Handle *handle, const char *name, uint64_t value, int make_persistent)
Set statistic value for the peer.
A 512-bit hashcode.
struct GNUNET_CRYPTO_EccSignaturePurpose purpose
Purpose.
void GNUNET_CRYPTO_pow_hash(const char *salt, const void *buf, size_t buf_len, struct GNUNET_HashCode *result)
Calculate the &#39;proof-of-work&#39; hash (an expensive hash).
Definition: crypto_pow.c:41
Message handler for a specific message type.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get(void)
Get the current time.
Definition: time.c:118
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?
#define NSE_PRIORITY
Message priority to use.
static struct GNUNET_REVOCATION_Query * q
Handle for revocation query.
Run when otherwise idle.
struct GNUNET_BIO_WriteHandle * GNUNET_BIO_write_open_file(const char *fn)
Open a file for writing.
Definition: bio.c:558
static struct GNUNET_IDENTITY_Handle * identity
Which namespace do we publish to? NULL if we do not publish to a namespace.
static struct GNUNET_STATISTICS_Handle * stats
Handle to the statistics service.
There must only be one value per key; storing a value should fail if a value under the same key alrea...
static void handle_p2p_estimate(void *cls, const struct GNUNET_NSE_FloodMessage *incoming_flood)
Core handler for size estimate flooding messages.
struct GNUNET_TESTBED_Peer * peer
The peer associated with this model.
struct GNUNET_HashCode key
The key used in the DHT.
static unsigned int size
Size of the "table".
Definition: peer.c:67
uint64_t proof_of_work
Proof of work, causing leading zeros when hashed with pkey.
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
void GNUNET_CORE_disconnect(struct GNUNET_CORE_Handle *handle)
Disconnect from the core service.
Definition: core_api.c:730
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
static double current_std_dev
The standard deviation of the last HISTORY_SIZE network size estimates.
int GNUNET_BIO_write_close(struct GNUNET_BIO_WriteHandle *h, char **emsg)
Close an IO handle.
Definition: bio.c:607
static void setup_estimate_message(struct GNUNET_NSE_ClientMessage *em)
Initialize a message to clients with the current network size estimate.
static unsigned int count_leading_zeroes(const struct GNUNET_HashCode *hash)
Count the leading zeroes in hash.
struct GNUNET_SCHEDULER_Task * transmit_task
Task scheduled to send message to this peer.
static void update_network_size_estimate()
We&#39;ve sent on our flood message or one that we received which was validated and closer than ours...
double size_estimate
The current estimated network size.
Definition: nse.h:62
#define ROUND_SIZE
#define GNUNET_TIME_UNIT_ZERO
Relative time zero.
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
an ECC signature using EdDSA.
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:193
static struct GNUNET_CORE_Handle * core_api
Handle to the core service.
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD.
struct GNUNET_NotificationContext * GNUNET_notification_context_create(unsigned int queue_length)
Create a new notification context.
Definition: nc.c:121
static void * handle_core_connect(void *cls, const struct GNUNET_PeerIdentity *peer, struct GNUNET_MQ_Handle *mq)
Method called whenever a peer connects.
Handle to a message queue.
Definition: mq.c:85
struct GNUNET_TIME_AbsoluteNBO timestamp
The current timestamp value (which all peers should agree on).
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.
#define GNUNET_NETWORK_STRUCT_END
Define as empty, GNUNET_PACKED should suffice, but this won&#39;t work on W32;.
Private ECC key encoded for transmission.
int GNUNET_CONTAINER_multipeermap_iterate(struct GNUNET_CONTAINER_MultiPeerMap *map, GNUNET_CONTAINER_PeerMapIterator it, void *it_cls)
Iterate over all entries in the map.
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:1079
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
enum RadiotapType __attribute__
The identity of the host (wraps the signing key of the peer).
Connection handle for the logger service.
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
The private key of this peer.
struct GNUNET_MQ_Handle * mq
Core handle for sending messages to this peer.
#define GNUNET_PACKED
gcc-ism to get packed structs.
static unsigned int estimate_count
Number of valid entries in the history.
configuration data
Definition: configuration.c:84
static struct GNUNET_TIME_Absolute next_timestamp
The next major time.
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.
static uint64_t my_proof
Proof of work for this peer.
static struct GNUNET_TIME_Absolute current_timestamp
The current major time.
int 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:707
#define GNUNET_log(kind,...)
Entry in list of pending tasks.
Definition: scheduler.c:134
uint32_t hop_count
Number of hops this message has taken so far.
#define GNUNET_SIGNATURE_PURPOSE_NSE_SEND
Signature of a network size estimate message.
Common type definitions for the network size estimation service and API.
int 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.
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.
static void handle_start(void *cls, const struct GNUNET_MessageHeader *message)
Handler for START message from client, triggers an immediate current network estimate notification...
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&#39;s key from the file specified in the configuration...
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:252
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:331
Header for all communications.
Time for absolute times used by GNUnet, in microseconds.
static void core_init(void *cls, const struct GNUNET_PeerIdentity *identity)
Called on core init/fail.
void GNUNET_notification_context_destroy(struct GNUNET_NotificationContext *nc)
Destroy the context, force disconnect for all subscribers.
Definition: nc.c:137
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
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.
unsigned int GNUNET_CONTAINER_multipeermap_size(const struct GNUNET_CONTAINER_MultiPeerMap *map)
Get the number of key-value pairs in the map.
const char * GNUNET_STRINGS_absolute_time_to_string(struct GNUNET_TIME_Absolute t)
Like asctime, except for GNUnet time.
Definition: strings.c:756
static unsigned long long matching_bits
Number of matching bits required for revocation.
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
struct GNUNET_TIME_AbsoluteNBO GNUNET_TIME_absolute_hton(struct GNUNET_TIME_Absolute a)
Convert absolute time to network byte order.
Definition: time.c:657
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
void GNUNET_SERVICE_client_continue(struct GNUNET_SERVICE_Client *c)
Continue receiving further messages from the given client.
Definition: service.c:2242
void GNUNET_TESTBED_LOGGER_disconnect(struct GNUNET_TESTBED_LOGGER_Handle *h)
Disconnect from the logger service.
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 ...
#define GNUNET_MQ_handler_end()
End-marker for the handlers array.
static void update_flood_message(void *cls)
Update our flood message to be sent (and our timestamps).
No good quality of the operation is needed (i.e., random numbers can be pseudo-random).
double GNUNET_hton_double(double d)
Convert double to network byte order.
Definition: common_endian.c:74
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...
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:794
uint64_t GNUNET_ntohll(uint64_t n)
Convert unsigned 64-bit integer to host byte order.
Definition: common_endian.c:53
uint32_t reserved
For alignment.
Definition: nse.h:52
#define GNUNET_free(ptr)
Wrapper around free.
Time for relative time used by GNUnet, in microseconds.
static GNUNET_NETWORK_STRUCT_END const struct GNUNET_CONFIGURATION_Handle * cfg
Handle to our current configuration.
Per-peer information.
struct GNUNET_CRYPTO_EddsaPublicKey public_key
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:972
Public ECC key (always for curve Ed25519) encoded in a format suitable for network transmission and E...