GNUnet  0.11.x
gnunet-communicator-tcp.c
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1 /*
2  This file is part of GNUnet
3  Copyright (C) 2010-2014, 2018, 2019 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 
35 #include "platform.h"
36 #include "gnunet_util_lib.h"
37 #include "gnunet_protocols.h"
38 #include "gnunet_signatures.h"
39 #include "gnunet_constants.h"
40 #include "gnunet_nt_lib.h"
41 #include "gnunet_nat_service.h"
44 
49 #define ADDRESS_VALIDITY_PERIOD \
50  GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 4)
51 
60 #define DEFAULT_MAX_QUEUE_LENGTH 8
61 
66 #define BUF_SIZE (2 * 64 * 1024 + sizeof(struct TCPBox))
67 
71 #define DEFAULT_REKEY_INTERVAL GNUNET_TIME_UNIT_DAYS
72 
76 #define PROTO_QUEUE_TIMEOUT GNUNET_TIME_UNIT_MINUTES
77 
82 #define REKEY_MAX_BYTES (1024LLU * 1024 * 1024 * 4LLU)
83 
88 #define INITIAL_KX_SIZE \
89  (sizeof(struct GNUNET_CRYPTO_EcdhePublicKey) \
90  + sizeof(struct TCPConfirmation))
91 
92 
96 #define COMMUNICATOR_ADDRESS_PREFIX "tcp"
97 
101 #define COMMUNICATOR_CONFIG_SECTION "communicator-tcp"
102 
104 
105 
111 {
116 
121 
126 
131 
137 };
138 
139 
144 {
149 
153  struct GNUNET_CRYPTO_EddsaSignature sender_sig;
154 
159  struct GNUNET_TIME_AbsoluteNBO monotonic_time;
160 };
161 
162 
166 struct TCPBox
167 {
174  struct GNUNET_MessageHeader header;
175 
184  struct GNUNET_ShortHashCode hmac;
185 
186  /* followed by as may bytes of payload as indicated in @e header,
187  excluding the TCPBox itself! */
188 };
189 
190 
195 struct TCPRekey
196 {
200  struct GNUNET_MessageHeader header;
201 
210  struct GNUNET_ShortHashCode hmac;
211 
216 
220  struct GNUNET_CRYPTO_EddsaSignature sender_sig;
221 
226  struct GNUNET_TIME_AbsoluteNBO monotonic_time;
227 };
228 
229 
235 struct TCPFinish
236 {
240  struct GNUNET_MessageHeader header;
241 
250  struct GNUNET_ShortHashCode hmac;
251 };
252 
253 
255 
256 
260 struct Queue
261 {
265  struct GNUNET_PeerIdentity target;
266 
271 
275  gcry_cipher_hd_t in_cipher;
276 
280  gcry_cipher_hd_t out_cipher;
281 
285  struct GNUNET_HashCode in_hmac;
286 
291  struct GNUNET_HashCode out_hmac;
292 
298 
303 
308 
312  struct sockaddr *address;
313 
319 
324  struct GNUNET_TIME_Absolute rekey_time;
325 
329  socklen_t address_len;
330 
335 
340 
344  unsigned long long bytes_in_queue;
345 
349  char cread_buf[BUF_SIZE];
350 
354  char cwrite_buf[BUF_SIZE];
355 
359  char pread_buf[UINT16_MAX + 1 + sizeof(struct TCPBox)];
360 
364  char pwrite_buf[UINT16_MAX + 1 + sizeof(struct TCPBox)];
365 
370  size_t cread_off;
371 
376  size_t cwrite_off;
377 
382  size_t pread_off;
383 
388  size_t pwrite_off;
389 
394 
402  unsigned int backpressure;
403 
408 
413 
418 
426 
431  int rekeyed;
432 };
433 
434 
440 {
444  struct ProtoQueue *next;
445 
449  struct ProtoQueue *prev;
450 
455 
460 
464  struct sockaddr *address;
465 
469  socklen_t address_len;
470 
475 
480  char ibuf[INITIAL_KX_SIZE];
481 
485  size_t ibuf_off;
486 };
487 
488 
493 
497 static unsigned long long max_queue_length;
498 
503 
508 
513 
518 
523 
528 
533 
537 static const struct GNUNET_CONFIGURATION_Handle *cfg;
538 
543 
547 static struct GNUNET_NAT_Handle *nat;
548 
552 static struct ProtoQueue *proto_head;
553 
557 static struct ProtoQueue *proto_tail;
558 
559 
567 static void
568 listen_cb (void *cls);
569 
570 
578 static void
580 {
581  struct GNUNET_MQ_Handle *mq;
582 
584  "Disconnecting queue for peer `%s'\n",
585  GNUNET_i2s (&queue->target));
586  if (NULL != (mq = queue->mq))
587  {
588  queue->mq = NULL;
589  GNUNET_MQ_destroy (mq);
590  }
591  if (NULL != queue->qh)
592  {
594  queue->qh = NULL;
595  }
596  GNUNET_assert (
597  GNUNET_YES ==
598  GNUNET_CONTAINER_multipeermap_remove (queue_map, &queue->target, queue));
599  GNUNET_STATISTICS_set (stats,
600  "# queues active",
602  GNUNET_NO);
603  if (NULL != queue->read_task)
604  {
606  queue->read_task = NULL;
607  }
608  if (NULL != queue->write_task)
609  {
611  queue->write_task = NULL;
612  }
614  gcry_cipher_close (queue->in_cipher);
615  gcry_cipher_close (queue->out_cipher);
616  GNUNET_free (queue->address);
617  if (0 != queue->backpressure)
618  queue->destroyed = GNUNET_YES;
619  else
620  GNUNET_free (queue);
621  if (NULL == listen_task)
623  listen_sock,
624  &listen_cb,
625  NULL);
626 }
627 
628 
637 static void
638 calculate_hmac (struct GNUNET_HashCode *hmac_secret,
639  const void *buf,
640  size_t buf_size,
641  struct GNUNET_ShortHashCode *smac)
642 {
643  struct GNUNET_HashCode mac;
644 
645  GNUNET_CRYPTO_hmac_raw (hmac_secret,
646  sizeof(struct GNUNET_HashCode),
647  buf,
648  buf_size,
649  &mac);
650  /* truncate to `struct GNUNET_ShortHashCode` */
651  memcpy (smac, &mac, sizeof(struct GNUNET_ShortHashCode));
652  /* ratchet hmac key */
653  GNUNET_CRYPTO_hash (hmac_secret,
654  sizeof(struct GNUNET_HashCode),
655  hmac_secret);
656 }
657 
658 
665 static void
667 {
668  struct TCPFinish fin;
669 
670  memset (&fin, 0, sizeof(fin));
671  fin.header.size = htons (sizeof(fin));
673  calculate_hmac (&queue->out_hmac, &fin, sizeof(fin), &fin.hmac);
674  /* if there is any message left in pwrite_buf, we
675  overwrite it (possibly dropping the last message
676  from CORE hard here) */
677  memcpy (queue->pwrite_buf, &fin, sizeof(fin));
678  queue->pwrite_off = sizeof(fin);
679  /* This flag will ensure that #queue_write() no longer
680  notifies CORE about the possibility of sending
681  more data, and that #queue_write() will call
682  #queue_destroy() once the @c fin was fully written. */
683  queue->finishing = GNUNET_YES;
684 }
685 
686 
694 static void
696 {
697  queue->timeout =
699 }
700 
701 
707 static void
708 queue_read (void *cls);
709 
710 
718 static void
719 core_read_finished_cb (void *cls, int success)
720 {
721  struct Queue *queue = cls;
722  if (GNUNET_OK != success)
724  "# messages lost in communicator API towards CORE",
725  1,
726  GNUNET_NO);
727  queue->backpressure--;
728  /* handle deferred queue destruction */
729  if ((queue->destroyed) && (0 == queue->backpressure))
730  {
731  GNUNET_free (queue);
732  return;
733  }
734  reschedule_queue_timeout (queue);
735  /* possibly unchoke reading, now that CORE made progress */
736  if (NULL == queue->read_task)
737  queue->read_task =
739  queue->timeout),
740  queue->sock,
741  &queue_read,
742  queue);
743 }
744 
745 
755 static void
757  const void *plaintext,
758  size_t plaintext_len)
759 {
760  const struct GNUNET_MessageHeader *hdr = plaintext;
761  int ret;
762 
763  if (ntohs (hdr->size) != plaintext_len)
764  {
765  /* NOTE: If we ever allow multiple CORE messages in one
766  BOX, this will have to change! */
767  GNUNET_break (0);
768  return;
769  }
771  &queue->target,
772  hdr,
775  queue);
776  if (GNUNET_OK == ret)
777  queue->backpressure++;
778  GNUNET_break (GNUNET_NO != ret); /* backpressure not working!? */
779  if (GNUNET_SYSERR == ret)
781  "# bytes lost due to CORE not running",
782  plaintext_len,
783  GNUNET_NO);
784 }
785 
786 
796 static void
797 setup_cipher (const struct GNUNET_HashCode *dh,
798  const struct GNUNET_PeerIdentity *pid,
799  gcry_cipher_hd_t *cipher,
800  struct GNUNET_HashCode *hmac_key)
801 {
802  char key[256 / 8];
803  char ctr[128 / 8];
804 
805  gcry_cipher_open (cipher,
806  GCRY_CIPHER_AES256 /* low level: go for speed */,
807  GCRY_CIPHER_MODE_CTR,
808  0 /* flags */);
810  sizeof(key),
811  "TCP-key",
812  strlen ("TCP-key"),
813  dh,
814  sizeof(*dh),
815  pid,
816  sizeof(*pid),
817  NULL,
818  0));
819  gcry_cipher_setkey (*cipher, key, sizeof(key));
821  sizeof(ctr),
822  "TCP-ctr",
823  strlen ("TCP-ctr"),
824  dh,
825  sizeof(*dh),
826  pid,
827  sizeof(*pid),
828  NULL,
829  0));
830  gcry_cipher_setctr (*cipher, ctr, sizeof(ctr));
832  GNUNET_CRYPTO_kdf (hmac_key,
833  sizeof(struct GNUNET_HashCode),
834  "TCP-hmac",
835  strlen ("TCP-hmac"),
836  dh,
837  sizeof(*dh),
838  pid,
839  sizeof(*pid),
840  NULL,
841  0));
842 }
843 
844 
851 static void
853  struct Queue *queue)
854 {
855  struct GNUNET_HashCode dh;
856 
857  GNUNET_CRYPTO_eddsa_ecdh (my_private_key, ephemeral, &dh);
858  setup_cipher (&dh, &my_identity, &queue->in_cipher, &queue->in_hmac);
859 }
860 
861 
870 static void
871 do_rekey (struct Queue *queue, const struct TCPRekey *rekey)
872 {
873  struct TcpHandshakeSignature thp;
875  thp.purpose.size = htonl (sizeof(thp));
876  thp.sender = queue->target;
877  thp.receiver = my_identity;
878  thp.ephemeral = rekey->ephemeral;
879  thp.monotonic_time = rekey->monotonic_time;
880  /* FIXME: check monotonic time is monotonic... */
881  if (GNUNET_OK !=
883  &thp.purpose,
884  &rekey->sender_sig,
885  &queue->target.public_key))
886  {
887  GNUNET_break (0);
888  queue_finish (queue);
889  return;
890  }
891  gcry_cipher_close (queue->in_cipher);
892  queue->rekeyed = GNUNET_YES;
893  setup_in_cipher (&rekey->ephemeral, queue);
894 }
895 
896 
904 static size_t
906 {
907  const struct GNUNET_MessageHeader *hdr =
908  (const struct GNUNET_MessageHeader *) queue->pread_buf;
909  const struct TCPBox *box = (const struct TCPBox *) queue->pread_buf;
910  const struct TCPRekey *rekey = (const struct TCPRekey *) queue->pread_buf;
911  const struct TCPFinish *fin = (const struct TCPFinish *) queue->pread_buf;
912  struct TCPRekey rekeyz;
913  struct TCPFinish finz;
914  struct GNUNET_ShortHashCode tmac;
915  uint16_t type;
916  size_t size = 0; /* make compiler happy */
917 
918  if (sizeof(*hdr) > queue->pread_off)
919  return 0; /* not even a header */
920  type = ntohs (hdr->type);
921  switch (type)
922  {
924  /* Special case: header size excludes box itself! */
925  if (ntohs (hdr->size) + sizeof(struct TCPBox) > queue->pread_off)
926  return 0;
927  calculate_hmac (&queue->in_hmac, &box[1], ntohs (hdr->size), &tmac);
928  if (0 != memcmp (&tmac, &box->hmac, sizeof(tmac)))
929  {
930  GNUNET_break_op (0);
931  queue_finish (queue);
932  return 0;
933  }
934  pass_plaintext_to_core (queue, (const void *) &box[1], ntohs (hdr->size));
935  size = ntohs (hdr->size) + sizeof(*box);
936  break;
937 
939  if (sizeof(*rekey) > queue->pread_off)
940  return 0;
941  if (ntohs (hdr->size) != sizeof(*rekey))
942  {
943  GNUNET_break_op (0);
944  queue_finish (queue);
945  return 0;
946  }
947  rekeyz = *rekey;
948  memset (&rekeyz.hmac, 0, sizeof(rekeyz.hmac));
949  calculate_hmac (&queue->in_hmac, &rekeyz, sizeof(rekeyz), &tmac);
950  if (0 != memcmp (&tmac, &rekey->hmac, sizeof(tmac)))
951  {
952  GNUNET_break_op (0);
953  queue_finish (queue);
954  return 0;
955  }
956  do_rekey (queue, rekey);
957  size = ntohs (hdr->size);
958  break;
959 
961  if (sizeof(*fin) > queue->pread_off)
962  return 0;
963  if (ntohs (hdr->size) != sizeof(*fin))
964  {
965  GNUNET_break_op (0);
966  queue_finish (queue);
967  return 0;
968  }
969  finz = *fin;
970  memset (&finz.hmac, 0, sizeof(finz.hmac));
971  calculate_hmac (&queue->in_hmac, &rekeyz, sizeof(rekeyz), &tmac);
972  if (0 != memcmp (&tmac, &fin->hmac, sizeof(tmac)))
973  {
974  GNUNET_break_op (0);
975  queue_finish (queue);
976  return 0;
977  }
978  /* handle FINISH by destroying queue */
979  queue_destroy (queue);
980  break;
981 
982  default:
983  GNUNET_break_op (0);
984  queue_finish (queue);
985  return 0;
986  }
987  GNUNET_assert (0 != size);
988  return size;
989 }
990 
991 
997 static void
998 queue_read (void *cls)
999 {
1000  struct Queue *queue = cls;
1001  struct GNUNET_TIME_Relative left;
1002  ssize_t rcvd;
1003 
1004  queue->read_task = NULL;
1005  rcvd = GNUNET_NETWORK_socket_recv (queue->sock,
1006  &queue->cread_buf[queue->cread_off],
1007  BUF_SIZE - queue->cread_off);
1009  "Received %lu bytes from TCP queue\n", rcvd);
1010  if (-1 == rcvd)
1011  {
1012  if ((EAGAIN != errno) && (EINTR != errno))
1013  {
1015  queue_finish (queue);
1016  return;
1017  }
1018  /* try again */
1020  queue->read_task =
1021  GNUNET_SCHEDULER_add_read_net (left, queue->sock, &queue_read, queue);
1022  return;
1023  }
1024  if (0 != rcvd)
1025  reschedule_queue_timeout (queue);
1026  queue->cread_off += rcvd;
1027  while ((queue->pread_off < sizeof(queue->pread_buf)) &&
1028  (queue->cread_off > 0))
1029  {
1030  size_t max = GNUNET_MIN (sizeof(queue->pread_buf) - queue->pread_off,
1031  queue->cread_off);
1032  size_t done;
1033  size_t total;
1034  size_t old_pread_off = queue->pread_off;
1035 
1036  GNUNET_assert (0 ==
1037  gcry_cipher_decrypt (queue->in_cipher,
1038  &queue->pread_buf[queue->pread_off],
1039  max,
1040  queue->cread_buf,
1041  max));
1042  queue->pread_off += max;
1043  total = 0;
1044  while (0 != (done = try_handle_plaintext (queue)))
1045  {
1046  /* 'done' bytes of plaintext were used, shift buffer */
1047  GNUNET_assert (done <= queue->pread_off);
1048  /* NOTE: this memmove() could possibly sometimes be
1049  avoided if we pass 'total' into try_handle_plaintext()
1050  and use it at an offset into the buffer there! */
1051  memmove (queue->pread_buf,
1052  &queue->pread_buf[done],
1053  queue->pread_off - done);
1054  queue->pread_off -= done;
1055  total += done;
1056  /* The last plaintext was a rekey, abort for now */
1057  if (GNUNET_YES == queue->rekeyed)
1058  break;
1059  }
1060  /* when we encounter a rekey message, the decryption above uses the
1061  wrong key for everything after the rekey; in that case, we have
1062  to re-do the decryption at 'total' instead of at 'max'.
1063  However, we have to take into account that the plaintext buffer may have
1064  already contained data and not jumpt too far ahead in the ciphertext.
1065  If there is no rekey and the last message is incomplete (max > total),
1066  it is safe to keep the decryption so we shift by 'max' */
1067  if (GNUNET_YES == queue->rekeyed)
1068  {
1069  max = total - old_pread_off;
1070  queue->rekeyed = GNUNET_NO;
1071  queue->pread_off = 0;
1072  }
1073  memmove (queue->cread_buf, &queue->cread_buf[max], queue->cread_off - max);
1074  queue->cread_off -= max;
1075  }
1076  if (BUF_SIZE == queue->cread_off)
1077  return; /* buffer full, suspend reading */
1079  if (0 != left.rel_value_us)
1080  {
1081  if (max_queue_length > queue->backpressure)
1082  {
1083  /* continue reading */
1085  queue->read_task =
1086  GNUNET_SCHEDULER_add_read_net (left, queue->sock, &queue_read, queue);
1087  }
1088  return;
1089  }
1091  "Queue %p was idle for %s, disconnecting\n",
1092  queue,
1095  GNUNET_YES));
1096  queue_finish (queue);
1097 }
1098 
1099 
1107 static struct sockaddr *
1108 tcp_address_to_sockaddr (const char *bindto, socklen_t *sock_len)
1109 {
1110  struct sockaddr *in;
1111  unsigned int port;
1112  char dummy[2];
1113  char *colon;
1114  char *cp;
1115 
1116  if (1 == sscanf (bindto, "%u%1s", &port, dummy))
1117  {
1118  /* interpreting value as just a PORT number */
1119  if (port > UINT16_MAX)
1120  {
1122  "BINDTO specification `%s' invalid: value too large for port\n",
1123  bindto);
1124  return NULL;
1125  }
1126  if ((GNUNET_NO == GNUNET_NETWORK_test_pf (PF_INET6)) ||
1127  (GNUNET_YES ==
1130  "DISABLE_V6")))
1131  {
1132  struct sockaddr_in *i4;
1133 
1134  i4 = GNUNET_malloc (sizeof(struct sockaddr_in));
1135  i4->sin_family = AF_INET;
1136  i4->sin_port = htons ((uint16_t) port);
1137 #if HAVE_SOCKADDR_IN_SIN_LEN
1138  i4->sin_len = sizeof(sizeof(struct sockaddr_in));
1139 #endif
1140  *sock_len = sizeof(struct sockaddr_in);
1141  in = (struct sockaddr *) i4;
1142  }
1143  else
1144  {
1145  struct sockaddr_in6 *i6;
1146 
1147  i6 = GNUNET_malloc (sizeof(struct sockaddr_in6));
1148  i6->sin6_family = AF_INET6;
1149  i6->sin6_port = htons ((uint16_t) port);
1150 #if HAVE_SOCKADDR_IN_SIN_LEN
1151  i6->sin6_len = sizeof(sizeof(struct sockaddr_in6));
1152 #endif
1153  *sock_len = sizeof(struct sockaddr_in6);
1154  in = (struct sockaddr *) i6;
1155  }
1156  return in;
1157  }
1158  cp = GNUNET_strdup (bindto);
1159  colon = strrchr (cp, ':');
1160  if (NULL != colon)
1161  {
1162  /* interpet value after colon as port */
1163  *colon = '\0';
1164  colon++;
1165  if (1 == sscanf (colon, "%u%1s", &port, dummy))
1166  {
1167  /* interpreting value as just a PORT number */
1168  if (port > UINT16_MAX)
1169  {
1171  "BINDTO specification `%s' invalid: value too large for port\n",
1172  bindto);
1173  GNUNET_free (cp);
1174  return NULL;
1175  }
1176  }
1177  else
1178  {
1179  GNUNET_log (
1181  "BINDTO specification `%s' invalid: last ':' not followed by number\n",
1182  bindto);
1183  GNUNET_free (cp);
1184  return NULL;
1185  }
1186  }
1187  else
1188  {
1189  /* interpret missing port as 0, aka pick any free one */
1190  port = 0;
1191  }
1192  {
1193  /* try IPv4 */
1194  struct sockaddr_in v4;
1195 
1196  if (1 == inet_pton (AF_INET, cp, &v4.sin_addr))
1197  {
1198  v4.sin_family = AF_INET;
1199  v4.sin_port = htons ((uint16_t) port);
1200 #if HAVE_SOCKADDR_IN_SIN_LEN
1201  v4.sin_len = sizeof(struct sockaddr_in);
1202 #endif
1203  in = GNUNET_memdup (&v4, sizeof(v4));
1204  *sock_len = sizeof(v4);
1205  GNUNET_free (cp);
1206  return in;
1207  }
1208  }
1209  {
1210  /* try IPv6 */
1211  struct sockaddr_in6 v6;
1212  const char *start;
1213 
1214  start = cp;
1215  if (('[' == *cp) && (']' == cp[strlen (cp) - 1]))
1216  {
1217  start++; /* skip over '[' */
1218  cp[strlen (cp) - 1] = '\0'; /* eat ']' */
1219  }
1220  if (1 == inet_pton (AF_INET6, start, &v6.sin6_addr))
1221  {
1222  v6.sin6_family = AF_INET6;
1223  v6.sin6_port = htons ((uint16_t) port);
1224 #if HAVE_SOCKADDR_IN_SIN_LEN
1225  v6.sin6_len = sizeof(sizeof(struct sockaddr_in6));
1226 #endif
1227  in = GNUNET_memdup (&v6, sizeof(v6));
1228  *sock_len = sizeof(v6);
1229  GNUNET_free (cp);
1230  return in;
1231  }
1232  }
1233  /* #5528 FIXME (feature!): maybe also try getnameinfo()? */
1234  GNUNET_free (cp);
1235  return NULL;
1236 }
1237 
1238 
1245 static void
1247 {
1248  struct GNUNET_HashCode dh;
1249 
1250  GNUNET_CRYPTO_ecdh_eddsa (&queue->ephemeral, &queue->target.public_key, &dh);
1251  /* we don't need the private key anymore, drop it! */
1252  memset (&queue->ephemeral, 0, sizeof(queue->ephemeral));
1253  setup_cipher (&dh, &queue->target, &queue->out_cipher, &queue->out_hmac);
1255  queue->rekey_left_bytes =
1257 }
1258 
1259 
1266 static void
1268 {
1269  struct TCPRekey rekey;
1270  struct TcpHandshakeSignature thp;
1271 
1272  GNUNET_assert (0 == queue->pwrite_off);
1273  memset (&rekey, 0, sizeof(rekey));
1277  rekey.header.size = ntohs (sizeof(rekey));
1279  rekey.monotonic_time =
1282  thp.purpose.size = htonl (sizeof(thp));
1283  thp.sender = my_identity;
1284  thp.receiver = queue->target;
1285  thp.ephemeral = rekey.ephemeral;
1286  thp.monotonic_time = rekey.monotonic_time;
1287  GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_eddsa_sign (my_private_key,
1288  &thp.purpose,
1289  &rekey.sender_sig));
1290  calculate_hmac (&queue->out_hmac, &rekey, sizeof(rekey), &rekey.hmac);
1291  /* Encrypt rekey message with 'old' cipher */
1292  GNUNET_assert (0 ==
1293  gcry_cipher_encrypt (queue->out_cipher,
1294  &queue->cwrite_buf[queue->cwrite_off],
1295  sizeof(rekey),
1296  &rekey,
1297  sizeof(rekey)));
1298  queue->cwrite_off += sizeof(rekey);
1299  /* Setup new cipher for successive messages */
1300  gcry_cipher_close (queue->out_cipher);
1301  setup_out_cipher (queue);
1302 }
1303 
1304 
1311 static void
1312 queue_write (void *cls)
1313 {
1314  struct Queue *queue = cls;
1315  ssize_t sent;
1316  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "In queue write\n");
1317  queue->write_task = NULL;
1318  if (0 != queue->cwrite_off)
1319  {
1320  sent = GNUNET_NETWORK_socket_send (queue->sock,
1321  queue->cwrite_buf,
1322  queue->cwrite_off);
1324  "Sent %lu bytes to TCP queue\n", sent);
1325  if ((-1 == sent) && (EAGAIN != errno) && (EINTR != errno))
1326  {
1328  queue_destroy (queue);
1329  return;
1330  }
1331  if (sent > 0)
1332  {
1333  size_t usent = (size_t) sent;
1334  queue->cwrite_off -= usent;
1335  memmove (queue->cwrite_buf,
1336  &queue->cwrite_buf[usent],
1337  queue->cwrite_off);
1338  reschedule_queue_timeout (queue);
1339  }
1340  }
1341  /* can we encrypt more? (always encrypt full messages, needed
1342  such that #mq_cancel() can work!) */
1343  if ((0 < queue->rekey_left_bytes) &&
1344  (queue->pwrite_off > 0) &&
1345  (queue->cwrite_off + queue->pwrite_off <= BUF_SIZE))
1346  {
1348  "Encrypting %lu bytes\n", queue->pwrite_off);
1349  GNUNET_assert (0 ==
1350  gcry_cipher_encrypt (queue->out_cipher,
1351  &queue->cwrite_buf[queue->cwrite_off],
1352  queue->pwrite_off,
1353  queue->pwrite_buf,
1354  queue->pwrite_off));
1355  if (queue->rekey_left_bytes > queue->pwrite_off)
1356  queue->rekey_left_bytes -= queue->pwrite_off;
1357  else
1358  queue->rekey_left_bytes = 0;
1359  queue->cwrite_off += queue->pwrite_off;
1360  queue->pwrite_off = 0;
1361  }
1362  if ((0 == queue->pwrite_off) &&
1363  ((0 == queue->rekey_left_bytes) ||
1364  (0 ==
1366  {
1367  inject_rekey (queue);
1368  }
1369  if ((0 == queue->pwrite_off) && (! queue->finishing) &&
1370  (GNUNET_YES == queue->mq_awaits_continue))
1371  {
1372  queue->mq_awaits_continue = GNUNET_NO;
1374  }
1375  /* did we just finish writing 'finish'? */
1376  if ((0 == queue->cwrite_off) && (GNUNET_YES == queue->finishing))
1377  {
1379  "Finishing queue\n");
1380  queue_destroy (queue);
1381  return;
1382  }
1383  /* do we care to write more? */
1384  if ((0 < queue->cwrite_off) || (0 < queue->pwrite_off))
1385  queue->write_task =
1387  queue->sock,
1388  &queue_write,
1389  queue);
1390 }
1391 
1392 
1401 static void
1403  const struct GNUNET_MessageHeader *msg,
1404  void *impl_state)
1405 {
1406  struct Queue *queue = impl_state;
1407  uint16_t msize = ntohs (msg->size);
1408  struct TCPBox box;
1410  "In MQ send. Queue finishing: %s; write task running: %s\n",
1411  (GNUNET_YES == queue->finishing) ? "yes" : "no",
1412  (NULL == queue->write_task) ? "yes" : "no");
1413  GNUNET_assert (mq == queue->mq);
1414  queue->mq_awaits_continue = GNUNET_YES;
1415  if (GNUNET_YES == queue->finishing)
1416  return; /* this queue is dying, drop msg */
1417  GNUNET_assert (0 == queue->pwrite_off);
1419  box.header.size = htons (msize);
1420  calculate_hmac (&queue->out_hmac, msg, msize, &box.hmac);
1421  memcpy (&queue->pwrite_buf[queue->pwrite_off], &box, sizeof(box));
1422  queue->pwrite_off += sizeof(box);
1423  memcpy (&queue->pwrite_buf[queue->pwrite_off], msg, msize);
1424  queue->pwrite_off += msize;
1426  "%lu bytes of plaintext to send\n", queue->pwrite_off);
1427  GNUNET_assert (NULL != queue->sock);
1428  if (NULL == queue->write_task)
1429  queue->write_task =
1431  queue->sock,
1432  &queue_write,
1433  queue);
1434 }
1435 
1436 
1445 static void
1446 mq_destroy (struct GNUNET_MQ_Handle *mq, void *impl_state)
1447 {
1448  struct Queue *queue = impl_state;
1449 
1450  if (mq == queue->mq)
1451  {
1452  queue->mq = NULL;
1453  queue_finish (queue);
1454  }
1455 }
1456 
1457 
1464 static void
1465 mq_cancel (struct GNUNET_MQ_Handle *mq, void *impl_state)
1466 {
1467  struct Queue *queue = impl_state;
1468 
1469  GNUNET_assert (0 != queue->pwrite_off);
1470  queue->pwrite_off = 0;
1471 }
1472 
1473 
1483 static void
1484 mq_error (void *cls, enum GNUNET_MQ_Error error)
1485 {
1486  struct Queue *queue = cls;
1487 
1489  "MQ error in queue to %s: %d\n",
1490  GNUNET_i2s (&queue->target),
1491  (int) error);
1492  queue_finish (queue);
1493 }
1494 
1495 
1503 static void
1505 {
1506  queue->nt =
1507  GNUNET_NT_scanner_get_type (is, queue->address, queue->address_len);
1509  queue_map,
1510  &queue->target,
1511  queue,
1513  GNUNET_STATISTICS_set (stats,
1514  "# queues active",
1516  GNUNET_NO);
1517  queue->timeout =
1520  &mq_destroy,
1521  &mq_cancel,
1522  queue,
1523  NULL,
1524  &mq_error,
1525  queue);
1526  {
1527  char *foreign_addr;
1528 
1529  switch (queue->address->sa_family)
1530  {
1531  case AF_INET:
1532  GNUNET_asprintf (&foreign_addr,
1533  "%s-%s",
1535  GNUNET_a2s (queue->address, queue->address_len));
1536  break;
1537 
1538  case AF_INET6:
1539  GNUNET_asprintf (&foreign_addr,
1540  "%s-%s",
1542  GNUNET_a2s (queue->address, queue->address_len));
1543  break;
1544 
1545  default:
1546  GNUNET_assert (0);
1547  }
1549  &queue->target,
1550  foreign_addr,
1551  0 /* no MTU */,
1552  queue->nt,
1553  cs,
1554  queue->mq);
1555  GNUNET_free (foreign_addr);
1556  }
1557 }
1558 
1559 
1570 static void
1572  const struct GNUNET_CRYPTO_EcdhePublicKey *epub)
1573 {
1574  struct TcpHandshakeSignature ths;
1575  struct TCPConfirmation tc;
1576 
1577  memcpy (queue->cwrite_buf, epub, sizeof(*epub));
1578  queue->cwrite_off = sizeof(*epub);
1579  /* compute 'tc' and append in encrypted format to cwrite_buf */
1580  tc.sender = my_identity;
1581  tc.monotonic_time =
1584  ths.purpose.size = htonl (sizeof(ths));
1585  ths.sender = my_identity;
1586  ths.receiver = queue->target;
1587  ths.ephemeral = *epub;
1588  ths.monotonic_time = tc.monotonic_time;
1589  GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_eddsa_sign (my_private_key,
1590  &ths.purpose,
1591  &tc.sender_sig));
1592  GNUNET_assert (0 ==
1593  gcry_cipher_encrypt (queue->out_cipher,
1594  &queue->cwrite_buf[queue->cwrite_off],
1595  sizeof(tc),
1596  &tc,
1597  sizeof(tc)));
1598  queue->cwrite_off += sizeof(tc);
1599 }
1600 
1601 
1609 static void
1611 {
1612  struct GNUNET_CRYPTO_EcdhePublicKey epub;
1613 
1617  setup_out_cipher (queue);
1618  transmit_kx (queue, &epub);
1619 }
1620 
1621 
1633 static int
1635  struct TCPConfirmation *tc,
1636  char *ibuf)
1637 {
1638  struct TcpHandshakeSignature ths;
1639 
1640  GNUNET_assert (
1641  0 ==
1642  gcry_cipher_decrypt (queue->in_cipher,
1643  tc,
1644  sizeof(*tc),
1645  &ibuf[sizeof(struct GNUNET_CRYPTO_EcdhePublicKey)],
1646  sizeof(*tc)));
1648  ths.purpose.size = htonl (sizeof(ths));
1649  ths.sender = tc->sender;
1650  ths.receiver = my_identity;
1651  memcpy (&ths.ephemeral, ibuf, sizeof(struct GNUNET_CRYPTO_EcdhePublicKey));
1652  ths.monotonic_time = tc->monotonic_time;
1653  /* FIXME: check monotonic time against previous mono times
1654  from this sender! */
1657  &ths.purpose,
1658  &tc->sender_sig,
1659  &tc->sender.public_key);
1660 }
1661 
1662 
1668 static void
1670 {
1672  GNUNET_free (pq->address);
1673  GNUNET_CONTAINER_DLL_remove (proto_head, proto_tail, pq);
1674  GNUNET_free (pq);
1675 }
1676 
1677 
1684 static void
1685 proto_read_kx (void *cls)
1686 {
1687  struct ProtoQueue *pq = cls;
1688  ssize_t rcvd;
1689  struct GNUNET_TIME_Relative left;
1690  struct Queue *queue;
1691  struct TCPConfirmation tc;
1692 
1693  pq->read_task = NULL;
1695  if (0 == left.rel_value_us)
1696  {
1697  free_proto_queue (pq);
1698  return;
1699  }
1700  rcvd = GNUNET_NETWORK_socket_recv (pq->sock,
1701  &pq->ibuf[pq->ibuf_off],
1702  sizeof(pq->ibuf) - pq->ibuf_off);
1704  "Received %lu bytes for KX\n", rcvd);
1705  if (-1 == rcvd)
1706  {
1707  if ((EAGAIN != errno) && (EINTR != errno))
1708  {
1710  free_proto_queue (pq);
1711  return;
1712  }
1713  /* try again */
1714  pq->read_task =
1716  return;
1717  }
1718  pq->ibuf_off += rcvd;
1719  if (pq->ibuf_off > sizeof(pq->ibuf))
1720  {
1721  /* read more */
1722  pq->read_task =
1724  return;
1725  }
1726  /* we got all the data, let's find out who we are talking to! */
1727  queue = GNUNET_new (struct Queue);
1728  setup_in_cipher ((const struct GNUNET_CRYPTO_EcdhePublicKey *) pq->ibuf,
1729  queue);
1730  if (GNUNET_OK != decrypt_and_check_tc (queue, &tc, pq->ibuf))
1731  {
1733  "Invalid TCP KX received from %s\n",
1734  GNUNET_a2s (queue->address, queue->address_len));
1735  gcry_cipher_close (queue->in_cipher);
1736  GNUNET_free (queue);
1737  free_proto_queue (pq);
1738  return;
1739  }
1740  queue->address = pq->address; /* steals reference */
1741  queue->address_len = pq->address_len;
1742  queue->target = tc.sender;
1743  queue->sock = pq->sock;
1744  start_initial_kx_out (queue);
1746  queue->read_task =
1748  queue->sock,
1749  &queue_read,
1750  queue);
1751  queue->write_task =
1753  queue->sock,
1754  &queue_write,
1755  queue);
1756  GNUNET_CONTAINER_DLL_remove (proto_head, proto_tail, pq);
1757  GNUNET_free (pq);
1758 }
1759 
1760 
1768 static void
1769 listen_cb (void *cls)
1770 {
1771  struct sockaddr_storage in;
1772  socklen_t addrlen;
1773  struct GNUNET_NETWORK_Handle *sock;
1774  struct ProtoQueue *pq;
1775 
1776  listen_task = NULL;
1777  GNUNET_assert (NULL != listen_sock);
1778  addrlen = sizeof(in);
1779  memset (&in, 0, sizeof(in));
1780  sock = GNUNET_NETWORK_socket_accept (listen_sock,
1781  (struct sockaddr*) &in,
1782  &addrlen);
1783  if ((NULL == sock) && ((EMFILE == errno) || (ENFILE == errno)))
1784  return; /* system limit reached, wait until connection goes down */
1786  listen_sock,
1787  &listen_cb,
1788  NULL);
1789  if ((NULL == sock) && ((EAGAIN == errno) || (ENOBUFS == errno)))
1790  return;
1791  if (NULL == sock)
1792  {
1794  return;
1795  }
1796  pq = GNUNET_new (struct ProtoQueue);
1797  pq->address_len = addrlen;
1798  pq->address = GNUNET_memdup (&in, addrlen);
1800  pq->sock = sock;
1802  pq->sock,
1803  &proto_read_kx,
1804  pq);
1805  GNUNET_CONTAINER_DLL_insert (proto_head, proto_tail, pq);
1806 }
1807 
1808 
1816 static void
1817 queue_read_kx (void *cls)
1818 {
1819  struct Queue *queue = cls;
1820  ssize_t rcvd;
1821  struct GNUNET_TIME_Relative left;
1822  struct TCPConfirmation tc;
1823 
1824  queue->read_task = NULL;
1826  if (0 == left.rel_value_us)
1827  {
1828  queue_destroy (queue);
1829  return;
1830  }
1831  rcvd = GNUNET_NETWORK_socket_recv (queue->sock,
1832  &queue->cread_buf[queue->cread_off],
1833  BUF_SIZE - queue->cread_off);
1834  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received %lu bytes for KX\n", rcvd);
1835  if (-1 == rcvd)
1836  {
1837  if ((EAGAIN != errno) && (EINTR != errno))
1838  {
1840  queue_destroy (queue);
1841  return;
1842  }
1843  queue->read_task =
1844  GNUNET_SCHEDULER_add_read_net (left, queue->sock, &queue_read_kx, queue);
1845  return;
1846  }
1847  queue->cread_off += rcvd;
1848  if (queue->cread_off < INITIAL_KX_SIZE)
1849  {
1850  /* read more */
1851  queue->read_task =
1852  GNUNET_SCHEDULER_add_read_net (left, queue->sock, &queue_read_kx, queue);
1853  return;
1854  }
1855  /* we got all the data, let's find out who we are talking to! */
1857  queue->cread_buf,
1858  queue);
1859  if (GNUNET_OK != decrypt_and_check_tc (queue, &tc, queue->cread_buf))
1860  {
1862  "Invalid TCP KX received from %s\n",
1863  GNUNET_a2s (queue->address, queue->address_len));
1864  queue_destroy (queue);
1865  return;
1866  }
1867  if (0 !=
1868  memcmp (&tc.sender, &queue->target, sizeof(struct GNUNET_PeerIdentity)))
1869  {
1871  "Invalid sender in TCP KX received from %s\n",
1872  GNUNET_a2s (queue->address, queue->address_len));
1873  queue_destroy (queue);
1874  return;
1875  }
1876 
1877  /* update queue timeout */
1878  reschedule_queue_timeout (queue);
1879  /* prepare to continue with regular read task immediately */
1880  memmove (queue->cread_buf,
1881  &queue->cread_buf[INITIAL_KX_SIZE],
1882  queue->cread_off - (INITIAL_KX_SIZE));
1883  queue->cread_off -= INITIAL_KX_SIZE;
1884  if (0 < queue->cread_off)
1885  queue->read_task = GNUNET_SCHEDULER_add_now (&queue_read, queue);
1886 }
1887 
1888 
1907 static int
1908 mq_init (void *cls, const struct GNUNET_PeerIdentity *peer, const char *address)
1909 {
1910  struct Queue *queue;
1911  const char *path;
1912  struct sockaddr *in;
1913  socklen_t in_len;
1914  struct GNUNET_NETWORK_Handle *sock;
1915 
1917  "Connecting to %s\n", address);
1918  if (0 != strncmp (address,
1920  strlen (COMMUNICATOR_ADDRESS_PREFIX "-")))
1921  {
1922  GNUNET_break_op (0);
1923  return GNUNET_SYSERR;
1924  }
1925  path = &address[strlen (COMMUNICATOR_ADDRESS_PREFIX "-")];
1926  in = tcp_address_to_sockaddr (path, &in_len);
1927 
1928  sock = GNUNET_NETWORK_socket_create (in->sa_family, SOCK_STREAM, IPPROTO_TCP);
1929  if (NULL == sock)
1930  {
1932  "socket(%d) failed: %s",
1933  in->sa_family,
1934  strerror (errno));
1935  GNUNET_free (in);
1936  return GNUNET_SYSERR;
1937  }
1938  if ((GNUNET_OK != GNUNET_NETWORK_socket_connect (sock, in, in_len)) &&
1939  (errno != EINPROGRESS))
1940  {
1942  "connect to `%s' failed: %s",
1943  address,
1944  strerror (errno));
1946  GNUNET_free (in);
1947  return GNUNET_SYSERR;
1948  }
1949 
1950  queue = GNUNET_new (struct Queue);
1951  queue->target = *peer;
1952  queue->address = in;
1953  queue->address_len = in_len;
1954  queue->sock = sock;
1956  //queue->mq_awaits_continue = GNUNET_YES;
1957  queue->read_task =
1959  queue->sock,
1960  &queue_read_kx,
1961  queue);
1962  start_initial_kx_out (queue);
1963  queue->write_task =
1965  queue->sock,
1966  &queue_write,
1967  queue);
1968  return GNUNET_OK;
1969 }
1970 
1971 
1980 static int
1982  const struct GNUNET_PeerIdentity *target,
1983  void *value)
1984 {
1985  struct Queue *queue = value;
1986 
1987  (void) cls;
1988  (void) target;
1989  queue_destroy (queue);
1990  return GNUNET_OK;
1991 }
1992 
1993 
1999 static void
2000 do_shutdown (void *cls)
2001 {
2002  while (NULL != proto_head)
2003  free_proto_queue (proto_head);
2004  if (NULL != nat)
2005  {
2006  GNUNET_NAT_unregister (nat);
2007  nat = NULL;
2008  }
2009  if (NULL != listen_task)
2010  {
2011  GNUNET_SCHEDULER_cancel (listen_task);
2012  listen_task = NULL;
2013  }
2014  if (NULL != listen_sock)
2015  {
2017  listen_sock = NULL;
2018  }
2021  if (NULL != ch)
2022  {
2024  ch = NULL;
2025  }
2026  if (NULL != stats)
2027  {
2029  stats = NULL;
2030  }
2031  if (NULL != my_private_key)
2032  {
2033  GNUNET_free (my_private_key);
2034  my_private_key = NULL;
2035  }
2036  if (NULL != is)
2037  {
2039  is = NULL;
2040  }
2041 }
2042 
2043 
2055 static void
2056 enc_notify_cb (void *cls,
2057  const struct GNUNET_PeerIdentity *sender,
2058  const struct GNUNET_MessageHeader *msg)
2059 {
2060  (void) cls;
2061  (void) sender;
2062  (void) msg;
2063  GNUNET_break_op (0);
2064 }
2065 
2066 
2080 static void
2081 nat_address_cb (void *cls,
2082  void **app_ctx,
2083  int add_remove,
2085  const struct sockaddr *addr,
2086  socklen_t addrlen)
2087 {
2088  char *my_addr;
2090 
2091  if (GNUNET_YES == add_remove)
2092  {
2093  enum GNUNET_NetworkType nt;
2094 
2095  GNUNET_asprintf (&my_addr,
2096  "%s-%s",
2098  GNUNET_a2s (addr, addrlen));
2099  nt = GNUNET_NT_scanner_get_type (is, addr, addrlen);
2100  ai =
2102  my_addr,
2103  nt,
2105  GNUNET_free (my_addr);
2106  *app_ctx = ai;
2107  }
2108  else
2109  {
2110  ai = *app_ctx;
2112  *app_ctx = NULL;
2113  }
2114 }
2115 
2116 
2125 static void
2126 run (void *cls,
2127  char *const *args,
2128  const char *cfgfile,
2129  const struct GNUNET_CONFIGURATION_Handle *c)
2130 {
2131  char *bindto;
2132  struct sockaddr *in;
2133  socklen_t in_len;
2134  struct sockaddr_storage in_sto;
2135  socklen_t sto_len;
2136 
2137  (void) cls;
2138  cfg = c;
2139  if (GNUNET_OK !=
2142  "BINDTO",
2143  &bindto))
2144  {
2147  "BINDTO");
2148  return;
2149  }
2150  if (GNUNET_OK !=
2153  "MAX_QUEUE_LENGTH",
2154  &max_queue_length))
2156  if (GNUNET_OK !=
2159  "REKEY_INTERVAL",
2160  &rekey_interval))
2162 
2163  in = tcp_address_to_sockaddr (bindto, &in_len);
2164  if (NULL == in)
2165  {
2167  "Failed to setup TCP socket address with path `%s'\n",
2168  bindto);
2169  GNUNET_free (bindto);
2170  return;
2171  }
2172  listen_sock =
2173  GNUNET_NETWORK_socket_create (in->sa_family, SOCK_STREAM, IPPROTO_TCP);
2174  if (NULL == listen_sock)
2175  {
2177  GNUNET_free (in);
2178  GNUNET_free (bindto);
2179  return;
2180  }
2181  if (GNUNET_OK != GNUNET_NETWORK_socket_bind (listen_sock, in, in_len))
2182  {
2184  GNUNET_NETWORK_socket_close (listen_sock);
2185  listen_sock = NULL;
2186  GNUNET_free (in);
2187  GNUNET_free (bindto);
2188  return;
2189  }
2190  if (GNUNET_OK !=
2191  GNUNET_NETWORK_socket_listen (listen_sock,
2192  5))
2193  {
2195  "listen");
2196  GNUNET_NETWORK_socket_close (listen_sock);
2197  listen_sock = NULL;
2198  GNUNET_free (in);
2199  GNUNET_free (bindto);
2200  }
2201  /* We might have bound to port 0, allowing the OS to figure it out;
2202  thus, get the real IN-address from the socket */
2203  sto_len = sizeof(in_sto);
2204  if (0 != getsockname (GNUNET_NETWORK_get_fd (listen_sock),
2205  (struct sockaddr *) &in_sto,
2206  &sto_len))
2207  {
2208  memcpy (&in_sto, in, in_len);
2209  sto_len = in_len;
2210  }
2211  GNUNET_free (in);
2212  GNUNET_free (bindto);
2213  in = (struct sockaddr *) &in_sto;
2214  in_len = sto_len;
2216  "Bound to `%s'\n",
2217  GNUNET_a2s ((const struct sockaddr *) &in_sto, sto_len));
2218  stats = GNUNET_STATISTICS_create ("C-TCP", cfg);
2220  is = GNUNET_NT_scanner_init ();
2222  if (NULL == my_private_key)
2223  {
2224  GNUNET_log (
2226  _ (
2227  "Transport service is lacking key configuration settings. Exiting.\n"));
2229  return;
2230  }
2232  /* start listening */
2234  listen_sock,
2235  &listen_cb,
2236  NULL);
2242  &mq_init,
2243  NULL,
2244  &enc_notify_cb,
2245  NULL);
2246  if (NULL == ch)
2247  {
2248  GNUNET_break (0);
2250  return;
2251  }
2252  nat = GNUNET_NAT_register (cfg,
2254  IPPROTO_TCP,
2255  1 /* one address */,
2256  (const struct sockaddr **) &in,
2257  &in_len,
2258  &nat_address_cb,
2259  NULL /* FIXME: support reversal: #5529 */,
2260  NULL /* closure */);
2261 }
2262 
2263 
2271 int
2272 main (int argc, char *const *argv)
2273 {
2274  static const struct GNUNET_GETOPT_CommandLineOption options[] = {
2276  };
2277  int ret;
2278 
2279  if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
2280  return 2;
2281 
2282  ret = (GNUNET_OK == GNUNET_PROGRAM_run (argc,
2283  argv,
2284  "gnunet-communicator-tcp",
2285  _ ("GNUnet TCP communicator"),
2286  options,
2287  &run,
2288  NULL))
2289  ? 0
2290  : 1;
2291  GNUNET_free ((void *) argv);
2292  return ret;
2293 }
2294 
2295 
2296 /* end of gnunet-communicator-tcp.c */
#define GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE
Signature used by TCP communicator handshake,.
int GNUNET_CRYPTO_ecdhe_key_create2(struct GNUNET_CRYPTO_EcdhePrivateKey *pk)
Create a new private key.
Definition: crypto_ecc.c:521
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
int GNUNET_NETWORK_socket_listen(const struct GNUNET_NETWORK_Handle *desc, int backlog)
Listen on a socket.
Definition: network.c:708
#define COMMUNICATOR_CONFIG_SECTION
Configuration section used by the communicator.
static void queue(const char *hostname)
Add hostname to the list of requests to be made.
Handle to the interface scanner.
Definition: nt.c:110
int rekeyed
GNUNET_YES if we just rekeyed and must thus possibly re-decrypt ciphertext.
char ibuf[(sizeof(struct GNUNET_CRYPTO_EcdhePublicKey)+sizeof(struct TCPConfirmation))]
Buffer for reading all the information we need to upgrade from protoqueue to queue.
static void listen_cb(void *cls)
We have been notified that our listen socket has something to read.
Transmission is reliabile (with ACKs), i.e.
int GNUNET_NETWORK_get_fd(const struct GNUNET_NETWORK_Handle *desc)
Return file descriptor for this network handle.
Definition: network.c:1080
static void setup_in_cipher(const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral, struct Queue *queue)
Setup cipher of queue for decryption.
static void queue_read_kx(void *cls)
Read from the socket of the queue until we have enough data to initialize the decryption logic and ca...
char cread_buf[(2 *64 *1024+sizeof(struct TCPBox))]
Buffer for reading ciphertext from network into.
enum GNUNET_NetworkType GNUNET_NT_scanner_get_type(struct GNUNET_NT_InterfaceScanner *is, const struct sockaddr *addr, socklen_t addrlen)
Returns where the address is located: loopback, LAN or WAN.
Definition: nt.c:314
static void done()
Handle for active NAT registrations.
Definition: nat_api.c:71
static void boot_queue(struct Queue *queue, enum GNUNET_TRANSPORT_ConnectionStatus cs)
Add the given queue to our internal data structure.
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_MessageHeader * msg
Definition: 005.c:2
struct GNUNET_PeerIdentity target
To whom are we talking to.
GNUNET_NAT_AddressClass
Some addresses contain sensitive information or are not suitable for global distribution.
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 void core_read_finished_cb(void *cls, int success)
Core tells us it is done processing a message that transport received on a queue with status success...
uint64_t rel_value_us
The actual value.
int main(int argc, char *const *argv)
The main function for the UNIX communicator.
static struct GNUNET_NAT_Handle * nat
Connection to NAT service.
int finishing
Did we enqueue a finish message and are closing down the queue?
struct GNUNET_HashCode in_hmac
Shared secret for HMAC verification on incoming data.
struct GNUNET_PeerIdentity sender
Identity of the inititor of the TCP connection (TCP client).
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
socklen_t address_len
Length of the address.
ssize_t GNUNET_NETWORK_socket_send(const struct GNUNET_NETWORK_Handle *desc, const void *buffer, size_t length)
Send data (always non-blocking).
Definition: network.c:816
static struct GNUNET_PeerIdentity my_identity
Our public key.
uint32_t purpose
What does this signature vouch for? This must contain a GNUNET_SIGNATURE_PURPOSE_XXX constant (from g...
size_t cread_off
At which offset in the ciphertext read buffer should we append more ciphertext for transmission next...
struct GNUNET_TRANSPORT_AddressIdentifier * GNUNET_TRANSPORT_communicator_address_add(struct GNUNET_TRANSPORT_CommunicatorHandle *ch, const char *address, enum GNUNET_NetworkType nt, struct GNUNET_TIME_Relative expiration)
Notify transport service about an address that this communicator provides for this peer...
static void run(void *cls, char *const *args, const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *c)
Setup communicator and launch network interactions.
struct GNUNET_CRYPTO_EcdhePublicKey ephemeral
Ephemeral key used by the sender.
void GNUNET_CRYPTO_hmac_raw(const void *key, size_t key_len, const void *plaintext, size_t plaintext_len, struct GNUNET_HashCode *hmac)
Calculate HMAC of a message (RFC 2104) TODO: Shouldn&#39; this be the standard hmac function and the abov...
Definition: crypto_hash.c:403
struct GNUNET_PeerIdentity sender
Sender&#39;s identity.
GNUNET_MQ_Error
Error codes for the queue.
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:1300
struct GNUNET_CRYPTO_EddsaSignature sender_sig
Sender&#39;s signature of type GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE.
unsigned int backpressure
How may messages did we pass from this queue to CORE for which we have yet to receive an acknoweldgem...
ssize_t GNUNET_NETWORK_socket_recv(const struct GNUNET_NETWORK_Handle *desc, void *buffer, size_t length)
Read data from a connected socket (always non-blocking).
Definition: network.c:787
struct GNUNET_SCHEDULER_Task * read_task
ID of read task for this connection.
#define GNUNET_SIGNATURE_COMMUNICATOR_TCP_REKEY
Signature used by TCP communicator rekey.
int destroyed
Did we technically destroy this queue, but kept the allocation around because of backpressure not bei...
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
int GNUNET_STRINGS_get_utf8_args(int argc, char *const *argv, int *u8argc, char *const **u8argv)
Returns utf-8 encoded arguments.
Definition: strings.c:1438
struct GNUNET_TIME_Absolute GNUNET_TIME_relative_to_absolute(struct GNUNET_TIME_Relative rel)
Convert relative time to an absolute time in the future.
Definition: time.c:246
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_REKEY
TCP communicator rekey message.
static struct GNUNET_SCHEDULER_Task * listen_task
ID of listen task.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static void proto_read_kx(void *cls)
Read from the socket of the proto queue until we have enough data to upgrade to full queue...
static struct GNUNET_SCHEDULER_TaskContext tc
Task context of the current task.
Definition: scheduler.c:418
uint64_t rekey_left_bytes
How many more bytes may we sent with the current out_cipher before we should rekey?
#define BUF_SIZE
Size of our IO buffers for ciphertext data.
int GNUNET_NETWORK_socket_bind(struct GNUNET_NETWORK_Handle *desc, const struct sockaddr *address, socklen_t address_len)
Bind a socket to a particular address.
Definition: network.c:485
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:745
#define PROTO_QUEUE_TIMEOUT
How long do we wait until we must have received the initial KX?
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_write_net(struct GNUNET_TIME_Relative delay, struct GNUNET_NETWORK_Handle *wfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay or when the specified file descriptor is ready f...
Definition: scheduler.c:1557
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
static void pass_plaintext_to_core(struct Queue *queue, const void *plaintext, size_t plaintext_len)
We received plaintext_len bytes of plaintext on queue.
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.
struct GNUNET_TIME_Absolute rekey_time
Until what time may we sent with the current out_cipher before we should rekey?
#define GNUNET_NO
Definition: gnunet_common.h:86
#define GNUNET_memdup(buf, size)
Allocate and initialize a block of memory.
static void transmit_kx(struct Queue *queue, const struct GNUNET_CRYPTO_EcdhePublicKey *epub)
Generate and transmit our ephemeral key and the signature for the initial KX with the other peer...
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
struct GNUNET_CRYPTO_EcdhePrivateKey ephemeral
Our ephemeral key.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
Definition of a command line option.
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_BOX
TCP communicator payload box.
static void calculate_hmac(struct GNUNET_HashCode *hmac_secret, const void *buf, size_t buf_size, struct GNUNET_ShortHashCode *smac)
Compute mac over buf, and ratched the hmac_secret.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
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:526
Handle for the service.
static void queue_read(void *cls)
Queue read task.
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
Time for absolute time used by GNUnet, in microseconds and in network byte order. ...
struct GNUNET_MQ_Handle * mq
Message queue we are providing for the ch.
GNUNET_NetworkType
Types of networks (with separate quotas) we support.
Definition: gnunet_nt_lib.h:35
Handle for an incoming connection where we do not yet have enough information to setup a full queue...
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_OPTION_END
Definition: 002.c:13
#define GNUNET_NETWORK_STRUCT_BEGIN
Define as empty, GNUNET_PACKED should suffice, but this won&#39;t work on W32.
void GNUNET_CONTAINER_multipeermap_destroy(struct GNUNET_CONTAINER_MultiPeerMap *map)
Destroy a hash map.
static void inject_rekey(struct Queue *queue)
Inject a struct TCPRekey message into the queue&#39;s plaintext buffer.
struct GNUNET_TIME_AbsoluteNBO monotonic_time
Monotonic time of sender, to possibly help detect replay attacks (if receiver persists times by sende...
A 256-bit hashcode.
Opaque handle to the transport service for communicators.
#define _(String)
GNU gettext support macro.
Definition: platform.h:180
void GNUNET_TRANSPORT_communicator_disconnect(struct GNUNET_TRANSPORT_CommunicatorHandle *ch)
Disconnect from the transport service.
static int decrypt_and_check_tc(struct Queue *queue, struct TCPConfirmation *tc, char *ibuf)
We have received the first bytes from the other side on a queue.
struct GNUNET_NETWORK_Handle * GNUNET_NETWORK_socket_accept(const struct GNUNET_NETWORK_Handle *desc, struct sockaddr *address, socklen_t *address_len)
Accept a new connection on a socket.
Definition: network.c:430
Signature we use to verify that the ephemeral key was really chosen by the specified sender...
header of what an ECC signature signs this must be followed by "size - 8" bytes of the actual signed ...
static struct GNUNET_TIME_Relative rekey_interval
The rekey interval.
static unsigned long long max_queue_length
Maximum queue length before we stop reading towards the transport service.
void GNUNET_TRANSPORT_communicator_mq_del(struct GNUNET_TRANSPORT_QueueHandle *qh)
Notify transport service that an MQ became unavailable due to a disconnect or timeout.
#define INITIAL_KX_SIZE
Size of the initial key exchange message sent first in both directions.
struct GNUNET_HashCode out_hmac
Shared secret for HMAC generation on outgoing data, ratcheted after each operation.
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
int GNUNET_asprintf(char **buf, const char *format,...)
Like asprintf, just portable.
static void enc_notify_cb(void *cls, const struct GNUNET_PeerIdentity *sender, const struct GNUNET_MessageHeader *msg)
Function called when the transport service has received an acknowledgement for this communicator (!) ...
int GNUNET_NETWORK_socket_connect(const struct GNUNET_NETWORK_Handle *desc, const struct sockaddr *address, socklen_t address_len)
Connect a socket to some remote address.
Definition: network.c:658
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
unsigned long long bytes_in_queue
Number of bytes we currently have in our write queue.
static struct GNUNET_CONTAINER_MultiPeerMap * queue_map
Queues (map from peer identity to struct Queue)
static struct GNUNET_TIME_Relative timeout
Desired timeout for the lookup (default is no timeout).
Definition: gnunet-abd.c:61
struct GNUNET_MQ_Handle * GNUNET_MQ_queue_for_callbacks(GNUNET_MQ_SendImpl send, GNUNET_MQ_DestroyImpl destroy, GNUNET_MQ_CancelImpl cancel, void *impl_state, const struct GNUNET_MQ_MessageHandler *handlers, GNUNET_MQ_ErrorHandler error_handler, void *cls)
Create a message queue for the specified handlers.
Definition: mq.c:552
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:844
static void queue_destroy(struct Queue *queue)
Functions with this signature are called whenever we need to close a queue due to a disconnect or fai...
void GNUNET_log_config_missing(enum GNUNET_ErrorType kind, const char *section, const char *option)
Log error message about missing configuration option.
int GNUNET_CRYPTO_eddsa_ecdh(const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, const struct GNUNET_CRYPTO_EcdhePublicKey *pub, struct GNUNET_HashCode *key_material)
Derive key material from a ECDH public key and a private EdDSA key.
Definition: crypto_ecc.c:1040
static char * value
Value of the record to add/remove.
Handle for a queue.
#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
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:1280
size_t cwrite_off
At which offset in the ciphertext write buffer should we append more ciphertext from reading next...
#define COMMUNICATOR_ADDRESS_PREFIX
Address prefix used by the communicator.
#define GNUNET_MIN(a, b)
Definition: gnunet_common.h:88
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:687
static char buf[2048]
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
Our private key.
struct GNUNET_TRANSPORT_CommunicatorHandle * GNUNET_TRANSPORT_communicator_connect(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *config_section_name, const char *addr_prefix, enum GNUNET_TRANSPORT_CommunicatorCharacteristics cc, GNUNET_TRANSPORT_CommunicatorMqInit mq_init, void *mq_init_cls, GNUNET_TRANSPORT_CommunicatorNotify notify_cb, void *notify_cb_cls)
Connect to the transport service.
static void setup_cipher(const struct GNUNET_HashCode *dh, const struct GNUNET_PeerIdentity *pid, gcry_cipher_hd_t *cipher, struct GNUNET_HashCode *hmac_key)
Setup cipher based on shared secret dh and decrypting peer pid.
this is an inbound connection (communicator initiated)
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
static void mq_destroy(struct GNUNET_MQ_Handle *mq, void *impl_state)
Signature of functions implementing the destruction of a message queue.
static void reschedule_queue_timeout(struct Queue *queue)
Increment queue timeout due to activity.
static void queue_finish(struct Queue *queue)
Append a &#39;finish&#39; message to the outgoing transmission.
const char * GNUNET_a2s(const struct sockaddr *addr, socklen_t addrlen)
Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string (for printing debug messages)...
struct GNUNET_MessageHeader header
Type is GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_FINISH.
struct GNUNET_NETWORK_Handle * sock
socket that we transmit all data with on this queue
struct GNUNET_TIME_Absolute timeout
Timeout for this protoqueue.
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_SCHEDULER_Task * write_task
ID of write task for this connection.
struct sockaddr * address
Address of the other peer.
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_EddsaSignature sender_sig
Sender&#39;s signature of type GNUNET_SIGNATURE_COMMUNICATOR_TCP_REKEY.
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_FINISH
TCP communicator end of stream.
int GNUNET_CRYPTO_ecdh_eddsa(const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, const struct GNUNET_CRYPTO_EddsaPublicKey *pub, struct GNUNET_HashCode *key_material)
Derive key material from a EdDSA public key and a private ECDH key.
Definition: crypto_ecc.c:1101
char cwrite_buf[(2 *64 *1024+sizeof(struct TCPBox))]
buffer for writing ciphertext to network.
struct GNUNET_TIME_AbsoluteNBO monotonic_time
Monotonic time of sender, to possibly help detect replay attacks (if receiver persists times by sende...
static void do_rekey(struct Queue *queue, const struct TCPRekey *rekey)
Handle rekey message on queue.
char pwrite_buf[UINT16_MAX+1+sizeof(struct TCPBox)]
Plaintext buffer for messages to be encrypted.
static struct GNUNET_NAT_AUTO_Test * nt
Handle to a NAT test operation.
void GNUNET_NT_scanner_done(struct GNUNET_NT_InterfaceScanner *is)
Terminate interface scanner.
Definition: nt.c:433
static struct sockaddr * tcp_address_to_sockaddr(const char *bindto, socklen_t *sock_len)
Convert TCP bind specification to a struct sockaddr *
int GNUNET_CONFIGURATION_get_value_string(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, char **value)
Get a configuration value that should be a string.
static void mq_cancel(struct GNUNET_MQ_Handle *mq, void *impl_state)
Implementation function that cancels the currently sent message.
struct GNUNET_TIME_AbsoluteNBO monotonic_time
Monotonic time of sender, to possibly help detect replay attacks (if receiver persists times by sende...
Private ECC key encoded for transmission.
void GNUNET_NAT_unregister(struct GNUNET_NAT_Handle *nh)
Stop port redirection and public IP address detection for the given handle.
Definition: nat_api.c:692
struct GNUNET_CRYPTO_EcdhePublicKey ephemeral
New ephemeral key.
size_t pread_off
At which offset in the plaintext input buffer should we append more plaintext from decryption next...
int mq_awaits_continue
Is MQ awaiting a GNUNET_MQ_impl_send_continue() call?
struct GNUNET_NETWORK_Handle * sock
socket that we transmit all data with on this queue
void GNUNET_TRANSPORT_communicator_address_remove(struct GNUNET_TRANSPORT_AddressIdentifier *ai)
Notify transport service about an address that this communicator no longer provides for this peer...
struct GNUNET_TESTBED_Peer * peer
The peer associated with this model.
struct GNUNET_HashCode key
The key used in the DHT.
#define GNUNET_SYSERR
Definition: gnunet_common.h:84
static unsigned int size
Size of the "table".
Definition: peer.c:67
static struct GNUNET_TRANSPORT_AddressIdentifier * ai
Handle to the operation that publishes our address.
void GNUNET_CRYPTO_ecdhe_key_get_public(const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, struct GNUNET_CRYPTO_EcdhePublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:206
static int get_queue_delete_it(void *cls, const struct GNUNET_PeerIdentity *target, void *value)
Iterator over all message queues to clean up.
static int mq_init(void *cls, const struct GNUNET_PeerIdentity *peer, const char *address)
Function called by the transport service to initialize a message queue given address information abou...
struct GNUNET_NAT_Handle * GNUNET_NAT_register(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *config_section, uint8_t proto, unsigned int num_addrs, const struct sockaddr **addrs, const socklen_t *addrlens, GNUNET_NAT_AddressCallback address_callback, GNUNET_NAT_ReversalCallback reversal_callback, void *callback_cls)
Attempt to enable port redirection and detect public IP address contacting UPnP or NAT-PMP routers on...
Definition: nat_api.c:378
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
static void mq_send(struct GNUNET_MQ_Handle *mq, const struct GNUNET_MessageHeader *msg, void *impl_state)
Signature of functions implementing the sending functionality of a message queue. ...
struct GNUNET_NT_InterfaceScanner * GNUNET_NT_scanner_init(void)
Initialize the address characterization client handle.
Definition: nt.c:412
static struct ProtoQueue * proto_tail
Protoqueues DLL tail.
#define DEFAULT_MAX_QUEUE_LENGTH
How many messages do we keep at most in the queue to the transport service before we start to drop (d...
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get_monotonic(const struct GNUNET_CONFIGURATION_Handle *cfg)
Obtain the current time and make sure it is monotonically increasing.
Definition: time.c:807
int GNUNET_TRANSPORT_communicator_receive(struct GNUNET_TRANSPORT_CommunicatorHandle *handle, const struct GNUNET_PeerIdentity *sender, const struct GNUNET_MessageHeader *msg, struct GNUNET_TIME_Relative expected_addr_validity, GNUNET_TRANSPORT_MessageCompletedCallback cb, void *cb_cls)
Notify transport service that the communicator has received a message.
TCP message box.
static void start_initial_kx_out(struct Queue *queue)
Initialize our key material for outgoing transmissions and inform the other peer about it...
an ECC signature using EdDSA.
struct GNUNET_PeerIdentity receiver
Presumed identity of the target of the TCP connection (TCP server)
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:189
static struct in_addr dummy
Target "dummy" address of the packet we pretend to respond to.
static struct GNUNET_NETWORK_Handle * listen_sock
Listen socket.
#define REKEY_MAX_BYTES
How often do we rekey based on number of bytes transmitted? (additionally randomized).
Allow multiple values with the same key.
#define GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT
After how long do we consider a connection to a peer dead if we don&#39;t receive messages from the peer...
Handle to a message queue.
Definition: mq.c:85
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.
socklen_t address_len
Length of the address.
#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.
The identity of the host (wraps the signing key of the peer).
static void free_proto_queue(struct ProtoQueue *pq)
Closes socket and frees memory associated with pq.
struct sockaddr * address
Address of the other peer.
size_t ibuf_off
Current offset for reading into ibuf.
static void setup_out_cipher(struct Queue *queue)
Setup cipher for outgoing data stream based on target and our ephemeral private key.
TCP rekey message box.
static uint16_t port
Port number.
Definition: gnunet-bcd.c:81
struct GNUNET_ShortHashCode hmac
HMAC for the following encrypted message.
configuration data
Definition: configuration.c:84
this is an outbound connection (transport initiated)
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
enum GNUNET_TRANSPORT_ConnectionStatus cs
Connection status for this queue.
struct GNUNET_SCHEDULER_Task * read_task
ID of read task for this connection.
Encrypted continuation of TCP initial handshake.
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and encr...
struct GNUNET_MQ_Handle * mq
Definition: 003.c:5
#define ADDRESS_VALIDITY_PERIOD
How long do we believe our addresses to remain up (before the other peer should revalidate).
size_t pwrite_off
At which offset in the plaintext output buffer should we append more plaintext for encryption next...
#define GNUNET_log(kind,...)
static void nat_address_cb(void *cls, void **app_ctx, int add_remove, enum GNUNET_NAT_AddressClass ac, const struct sockaddr *addr, socklen_t addrlen)
Signature of the callback passed to GNUNET_NAT_register() for a function to call whenever our set of ...
Entry in list of pending tasks.
Definition: scheduler.c:134
struct ProtoQueue * next
Kept in a DLL.
struct GNUNET_MessageHeader header
Type is GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_REKEY.
struct GNUNET_MessageHeader header
Type is GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_BOX.
handle to a socket
Definition: network.c:52
struct GNUNET_ShortHashCode hmac
HMAC for the following encrypted message.
int GNUNET_PROGRAM_run(int argc, char *const *argv, const char *binaryName, const char *binaryHelp, const struct GNUNET_GETOPT_CommandLineOption *options, GNUNET_PROGRAM_Main task, void *task_cls)
Run a standard GNUnet command startup sequence (initialize loggers and configuration, parse options).
Definition: program.c:367
struct ProtoQueue * prev
Kept in a DLL.
static void mq_error(void *cls, enum GNUNET_MQ_Error error)
Generic error handler, called with the appropriate error code and the same closure specified at the c...
static size_t try_handle_plaintext(struct Queue *queue)
Test if we have received a full message in plaintext.
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...
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
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model
gcry_cipher_hd_t in_cipher
cipher for decryption of incoming data.
Header for all communications.
Time for absolute times used by GNUnet, in microseconds.
void GNUNET_MQ_destroy(struct GNUNET_MQ_Handle *mq)
Destroy the message queue.
Definition: mq.c:824
#define GNUNET_YES
Definition: gnunet_common.h:85
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_read_net(struct GNUNET_TIME_Relative delay, struct GNUNET_NETWORK_Handle *rfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay or when the specified file descriptor is ready f...
Definition: scheduler.c:1486
struct GNUNET_TRANSPORT_QueueHandle * GNUNET_TRANSPORT_communicator_mq_add(struct GNUNET_TRANSPORT_CommunicatorHandle *ch, const struct GNUNET_PeerIdentity *peer, const char *address, uint32_t mtu, enum GNUNET_NetworkType nt, enum GNUNET_TRANSPORT_ConnectionStatus cs, struct GNUNET_MQ_Handle *mq)
Notify transport service that a MQ became available due to an "inbound" connection or because the com...
GNUNET_TRANSPORT_ConnectionStatus
Possible states of a connection.
enum GNUNET_NetworkType nt
Which network type does this queue use?
unsigned int GNUNET_CONTAINER_multipeermap_size(const struct GNUNET_CONTAINER_MultiPeerMap *map)
Get the number of key-value pairs in the map.
struct GNUNET_CRYPTO_EccSignaturePurpose purpose
Purpose must be GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE.
struct GNUNET_TIME_Absolute timeout
Timeout for this queue.
static void do_shutdown(void *cls)
Shutdown the UNIX communicator.
static struct GNUNET_PeerIdentity pid
Identity of the peer we transmit to / connect to.
struct GNUNET_ShortHashCode hmac
HMAC for the following encrypted message.
#define DEFAULT_REKEY_INTERVAL
How often do we rekey based on time (at least)
static struct ProtoQueue * proto_head
Protoqueues DLL head.
int GNUNET_CONFIGURATION_get_value_yesno(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option)
Get a configuration value that should be in a set of "YES" or "NO".
static struct GNUNET_TRANSPORT_CommunicatorHandle * ch
Our environment.
static const struct GNUNET_CONFIGURATION_Handle * cfg
Our configuration.
struct GNUNET_TRANSPORT_QueueHandle * qh
handle for this queue with the ch.
struct GNUNET_TIME_AbsoluteNBO GNUNET_TIME_absolute_hton(struct GNUNET_TIME_Absolute a)
Convert absolute time to network byte order.
Definition: time.c:657
static char * address
GNS address for this phone.
void GNUNET_MQ_impl_send_continue(struct GNUNET_MQ_Handle *mq)
Call the send implementation for the next queued message, if any.
Definition: mq.c:486
gcry_cipher_hd_t out_cipher
cipher for encryption of outgoing data.
int GNUNET_CRYPTO_kdf(void *result, size_t out_len, const void *xts, size_t xts_len, const void *skm, size_t skm_len,...)
Derive key.
Definition: crypto_kdf.c:89
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
Handle returned to identify the internal data structure the transport API has created to manage a mes...
char pread_buf[UINT16_MAX+1+sizeof(struct TCPBox)]
Plaintext buffer for decrypted plaintext.
int GNUNET_NETWORK_socket_close(struct GNUNET_NETWORK_Handle *desc)
Close a socket.
Definition: network.c:560
No good quality of the operation is needed (i.e., random numbers can be pseudo-random).
#define GNUNET_malloc(size)
Wrapper around malloc.
int GNUNET_NETWORK_test_pf(int pf)
Test if the given protocol family is supported by this system.
Definition: network.c:85
Internal representation of an address a communicator is currently providing for the transport service...
#define GNUNET_free(ptr)
Wrapper around free.
Time for relative time used by GNUnet, in microseconds.
struct GNUNET_CRYPTO_EddsaPublicKey public_key
struct GNUNET_NETWORK_Handle * GNUNET_NETWORK_socket_create(int domain, int type, int protocol)
Create a new socket.
Definition: network.c:912
static void queue_write(void *cls)
We have been notified that our socket is ready to write.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:966