--- /dev/null
+/*
+ This file is part of GNUnet.
+ (C) 2009, 2010 Christian Grothoff (and other contributing authors)
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file core/gnunet-service-core.c
+ * @brief high-level P2P messaging
+ * @author Christian Grothoff
+ *
+ * Type map implementation:
+ * - track type maps for neighbours (can wait)
+ * - only notify clients about peers with matching type maps (can wait)
+ *
+ * Considerations for later:
+ * - check that hostkey used by transport (for HELLOs) is the
+ * same as the hostkey that we are using!
+ */
+#include "platform.h"
+#include <zlib.h>
+#include "gnunet_constants.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_hello_lib.h"
+#include "gnunet_peerinfo_service.h"
+#include "gnunet_protocols.h"
+#include "gnunet_signatures.h"
+#include "gnunet_statistics_service.h"
+#include "gnunet_transport_service.h"
+#include "core.h"
+
+
+#define DEBUG_HANDSHAKE GNUNET_EXTRA_LOGGING
+
+#define DEBUG_CORE_QUOTA GNUNET_EXTRA_LOGGING
+
+/**
+ * Receive and send buffer windows grow over time. For
+ * how long can 'unused' bandwidth accumulate before we
+ * need to cap it? (specified in seconds).
+ */
+#define MAX_WINDOW_TIME_S (5 * 60)
+
+/**
+ * How many messages do we queue up at most for optional
+ * notifications to a client? (this can cause notifications
+ * about outgoing messages to be dropped).
+ */
+#define MAX_NOTIFY_QUEUE 1024
+
+/**
+ * Minimum bandwidth (out) to assign to any connected peer.
+ * Should be rather low; values larger than DEFAULT_BW_IN_OUT make no
+ * sense.
+ */
+#define MIN_BANDWIDTH_PER_PEER GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT
+
+/**
+ * After how much time past the "official" expiration time do
+ * we discard messages? Should not be zero since we may
+ * intentionally defer transmission until close to the deadline
+ * and then may be slightly past the deadline due to inaccuracy
+ * in sleep and our own CPU consumption.
+ */
+#define PAST_EXPIRATION_DISCARD_TIME GNUNET_TIME_UNIT_SECONDS
+
+/**
+ * What is the maximum delay for a SET_KEY message?
+ */
+#define MAX_SET_KEY_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
+
+/**
+ * How long do we wait for SET_KEY confirmation initially?
+ */
+#define INITIAL_SET_KEY_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 1)
+
+/**
+ * What is the maximum delay for a PING message?
+ */
+#define MAX_PING_DELAY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 2)
+
+/**
+ * What is the maximum delay for a PONG message?
+ */
+#define MAX_PONG_DELAY GNUNET_TIME_relative_multiply (MAX_PING_DELAY, 2)
+
+/**
+ * What is the minimum frequency for a PING message?
+ */
+#define MIN_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
+
+/**
+ * How often do we recalculate bandwidth quotas?
+ */
+#define QUOTA_UPDATE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
+
+/**
+ * What is the priority for a SET_KEY message?
+ */
+#define SET_KEY_PRIORITY 0xFFFFFF
+
+/**
+ * What is the priority for a PING message?
+ */
+#define PING_PRIORITY 0xFFFFFF
+
+/**
+ * What is the priority for a PONG message?
+ */
+#define PONG_PRIORITY 0xFFFFFF
+
+/**
+ * How many messages do we queue per peer at most? Must be at
+ * least two.
+ */
+#define MAX_PEER_QUEUE_SIZE 16
+
+/**
+ * How many non-mandatory messages do we queue per client at most?
+ */
+#define MAX_CLIENT_QUEUE_SIZE 32
+
+/**
+ * What is the maximum age of a message for us to consider
+ * processing it? Note that this looks at the timestamp used
+ * by the other peer, so clock skew between machines does
+ * come into play here. So this should be picked high enough
+ * so that a little bit of clock skew does not prevent peers
+ * from connecting to us.
+ */
+#define MAX_MESSAGE_AGE GNUNET_TIME_UNIT_DAYS
+
+
+/**
+ * State machine for our P2P encryption handshake. Everyone starts in
+ * "DOWN", if we receive the other peer's key (other peer initiated)
+ * we start in state RECEIVED (since we will immediately send our
+ * own); otherwise we start in SENT. If we get back a PONG from
+ * within either state, we move up to CONFIRMED (the PONG will always
+ * be sent back encrypted with the key we sent to the other peer).
+ */
+enum PeerStateMachine
+{
+ /**
+ * No handshake yet.
+ */
+ PEER_STATE_DOWN,
+
+ /**
+ * We've sent our session key.
+ */
+ PEER_STATE_KEY_SENT,
+
+ /**
+ * We've received the other peers session key.
+ */
+ PEER_STATE_KEY_RECEIVED,
+
+ /**
+ * The other peer has confirmed our session key with a message
+ * encrypted with his session key (which we got). Session is now fully up.
+ */
+ PEER_STATE_KEY_CONFIRMED
+};
+
+
+/**
+ * Encapsulation for encrypted messages exchanged between
+ * peers. Followed by the actual encrypted data.
+ */
+struct EncryptedMessage
+{
+ /**
+ * Message type is either CORE_ENCRYPTED_MESSAGE.
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * Random value used for IV generation.
+ */
+ uint32_t iv_seed GNUNET_PACKED;
+
+ /**
+ * MAC of the encrypted message (starting at 'sequence_number'),
+ * used to verify message integrity. Everything after this value
+ * (excluding this value itself) will be encrypted and authenticated.
+ * ENCRYPTED_HEADER_SIZE must be set to the offset of the *next* field.
+ */
+ GNUNET_HashCode hmac;
+
+ /**
+ * Sequence number, in network byte order. This field
+ * must be the first encrypted/decrypted field
+ */
+ uint32_t sequence_number GNUNET_PACKED;
+
+ /**
+ * Desired bandwidth (how much we should send to this peer / how
+ * much is the sender willing to receive)?
+ */
+ struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
+
+ /**
+ * Timestamp. Used to prevent reply of ancient messages
+ * (recent messages are caught with the sequence number).
+ */
+ struct GNUNET_TIME_AbsoluteNBO timestamp;
+
+};
+
+
+/**
+ * Number of bytes (at the beginning) of "struct EncryptedMessage"
+ * that are NOT encrypted.
+ */
+#define ENCRYPTED_HEADER_SIZE (offsetof(struct EncryptedMessage, sequence_number))
+
+
+/**
+ * Our identity.
+ */
+struct GNUNET_PeerIdentity GSC_my_identity;
+
+/**
+ * Our configuration.
+ */
+const struct GNUNET_CONFIGURATION_Handle *GSC_cfg;
+
+/**
+ * For creating statistics.
+ */
+struct GNUNET_STATISTICS_Handle *GSC_stats;
+
+
+
+
+
+/**
+ * Last task run during shutdown. Disconnects us from
+ * the transport.
+ */
+static void
+cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core service shutting down.\n");
+#endif
+ if (stats != NULL)
+ GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
+}
+
+
+/**
+ * Initiate core service.
+ *
+ * @param cls closure
+ * @param server the initialized server
+ * @param c configuration to use
+ */
+static void
+run (void *cls, struct GNUNET_SERVER_Handle *server,
+ const struct GNUNET_CONFIGURATION_Handle *c)
+{
+ cfg = c;
+ /* setup transport connection */
+ stats = GNUNET_STATISTICS_create ("core", cfg);
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleaning_task,
+ NULL);
+ /* process client requests */
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Core service of `%4s' ready.\n"),
+ GNUNET_i2s (&my_identity));
+}
+
+
+
+/**
+ * The main function for the transport service.
+ *
+ * @param argc number of arguments from the command line
+ * @param argv command line arguments
+ * @return 0 ok, 1 on error
+ */
+int
+main (int argc, char *const *argv)
+{
+ return (GNUNET_OK ==
+ GNUNET_SERVICE_run (argc, argv, "core", GNUNET_SERVICE_OPTION_NONE,
+ &run, NULL)) ? 0 : 1;
+}
+
+/* end of gnunet-service-core.c */
--- /dev/null
+
+/**
+ * Our configuration.
+ */
+extern const struct GNUNET_CONFIGURATION_Handle *GSC_cfg;
+
+/**
+ * For creating statistics.
+ */
+extern struct GNUNET_STATISTICS_Handle *GSC_stats;
+
+/**
+ * Our identity.
+ */
+extern struct GNUNET_PeerIdentity GSC_my_identity;
--- /dev/null
+
+/**
+ * How much inbound bandwidth are we supposed to be using per second?
+ */
+static unsigned long long bandwidth_target_in_bps;
+
+/**
+ * How much outbound bandwidth are we supposed to be using per second?
+ */
+static unsigned long long bandwidth_target_out_bps;
+
+
+
+/**
+ * Schedule the task that will recalculate the bandwidth
+ * quota for this peer (and possibly force a disconnect of
+ * idle peers by calculating a bandwidth of zero).
+ */
+static void
+schedule_quota_update (struct Neighbour *n)
+{
+ GNUNET_assert (n->quota_update_task == GNUNET_SCHEDULER_NO_TASK);
+ n->quota_update_task =
+ GNUNET_SCHEDULER_add_delayed (QUOTA_UPDATE_FREQUENCY,
+ &neighbour_quota_update, n);
+}
+
+
+/**
+ * Function that recalculates the bandwidth quota for the
+ * given neighbour and transmits it to the transport service.
+ *
+ * @param cls neighbour for the quota update
+ * @param tc context
+ */
+static void
+neighbour_quota_update (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Neighbour *n = cls;
+ struct GNUNET_BANDWIDTH_Value32NBO q_in;
+ struct GNUNET_BANDWIDTH_Value32NBO q_out;
+ struct GNUNET_BANDWIDTH_Value32NBO q_out_min;
+ double pref_rel;
+ double share;
+ unsigned long long distributable;
+ uint64_t need_per_peer;
+ uint64_t need_per_second;
+ unsigned int neighbour_count;
+
+#if DEBUG_CORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Neighbour quota update calculation running for peer `%4s'\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
+ /* calculate relative preference among all neighbours;
+ * divides by a bit more to avoid division by zero AND to
+ * account for possibility of new neighbours joining any time
+ * AND to convert to double... */
+ neighbour_count = GNUNET_CONTAINER_multihashmap_size (neighbours);
+ if (neighbour_count == 0)
+ return;
+ if (preference_sum == 0)
+ {
+ pref_rel = 1.0 / (double) neighbour_count;
+ }
+ else
+ {
+ pref_rel = (double) n->current_preference / preference_sum;
+ }
+ need_per_peer =
+ GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
+ GNUNET_TIME_UNIT_SECONDS);
+ need_per_second = need_per_peer * neighbour_count;
+
+ /* calculate inbound bandwidth per peer */
+ distributable = 0;
+ if (bandwidth_target_in_bps > need_per_second)
+ distributable = bandwidth_target_in_bps - need_per_second;
+ share = distributable * pref_rel;
+ if (share + need_per_peer > UINT32_MAX)
+ q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
+ else
+ q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
+
+ /* calculate outbound bandwidth per peer */
+ distributable = 0;
+ if (bandwidth_target_out_bps > need_per_second)
+ distributable = bandwidth_target_out_bps - need_per_second;
+ share = distributable * pref_rel;
+ if (share + need_per_peer > UINT32_MAX)
+ q_out = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
+ else
+ q_out = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
+ n->bw_out_internal_limit = q_out;
+
+ q_out_min =
+ GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
+ n->bw_out_internal_limit);
+ GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window, n->bw_out);
+
+ /* check if we want to disconnect for good due to inactivity */
+ if ((GNUNET_TIME_absolute_get_duration (get_neighbour_timeout (n)).rel_value >
+ 0) &&
+ (GNUNET_TIME_absolute_get_duration (n->time_established).rel_value >
+ GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value))
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Forcing disconnect of `%4s' due to inactivity\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# peers disconnected due to inactivity"), 1,
+ GNUNET_NO);
+ q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
+ }
+#if DEBUG_CORE_QUOTA
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
+ GNUNET_i2s (&n->peer), (unsigned int) ntohl (q_in.value__),
+ bandwidth_target_out_bps, (unsigned int) ntohl (n->bw_in.value__),
+ (unsigned int) ntohl (n->bw_out.value__),
+ (unsigned int) ntohl (n->bw_out_internal_limit.value__));
+#endif
+ if ((n->bw_in.value__ != q_in.value__) ||
+ (n->bw_out.value__ != q_out_min.value__))
+ {
+ if (n->bw_in.value__ != q_in.value__)
+ n->bw_in = q_in;
+ if (n->bw_out.value__ != q_out_min.value__)
+ n->bw_out = q_out_min;
+ if (GNUNET_YES == n->is_connected)
+ GNUNET_TRANSPORT_set_quota (transport, &n->peer, n->bw_in, n->bw_out);
+ handle_peer_status_change (n);
+ }
+ schedule_quota_update (n);
+}
+
+
+
+void
+GSC_ATS_init ()
+{
+ if ((GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (c, "CORE", "TOTAL_QUOTA_IN",
+ &bandwidth_target_in_bps)) ||
+ (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (c, "CORE", "TOTAL_QUOTA_OUT",
+ &bandwidth_target_out_bps)) )
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("Core service is lacking key configuration settings. Exiting.\n"));
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+}
--- /dev/null
+
+/**
+ * Data structure for each client connected to the core service.
+ */
+struct Client
+{
+ /**
+ * Clients are kept in a linked list.
+ */
+ struct Client *next;
+
+ /**
+ * Handle for the client with the server API.
+ */
+ struct GNUNET_SERVER_Client *client_handle;
+
+ /**
+ * Array of the types of messages this peer cares
+ * about (with "tcnt" entries). Allocated as part
+ * of this client struct, do not free!
+ */
+ const uint16_t *types;
+
+ /**
+ * Map of peer identities to active transmission requests of this
+ * client to the peer (of type 'struct ClientActiveRequest').
+ */
+ struct GNUNET_CONTAINER_MultiHashMap *requests;
+
+ /**
+ * Options for messages this client cares about,
+ * see GNUNET_CORE_OPTION_ values.
+ */
+ uint32_t options;
+
+ /**
+ * Number of types of incoming messages this client
+ * specifically cares about. Size of the "types" array.
+ */
+ unsigned int tcnt;
+
+};
+
+
+/**
+ * Record kept for each request for transmission issued by a
+ * client that is still pending.
+ */
+struct ClientActiveRequest
+{
+
+ /**
+ * Active requests are kept in a doubly-linked list of
+ * the respective target peer.
+ */
+ struct ClientActiveRequest *next;
+
+ /**
+ * Active requests are kept in a doubly-linked list of
+ * the respective target peer.
+ */
+ struct ClientActiveRequest *prev;
+
+ /**
+ * Handle to the client.
+ */
+ struct Client *client;
+
+ /**
+ * By what time would the client want to see this message out?
+ */
+ struct GNUNET_TIME_Absolute deadline;
+
+ /**
+ * How important is this request.
+ */
+ uint32_t priority;
+
+ /**
+ * How many more requests does this client have?
+ */
+ uint32_t queue_size;
+
+ /**
+ * How many bytes does the client intend to send?
+ */
+ uint16_t msize;
+
+ /**
+ * Unique request ID (in big endian).
+ */
+ uint16_t smr_id;
+
+};
+
+
+
+/**
+ * Linked list of our clients.
+ */
+static struct Client *clients;
+
+/**
+ * Context for notifications we need to send to our clients.
+ */
+static struct GNUNET_SERVER_NotificationContext *notifier;
+
+
+/**
+ * Our message stream tokenizer (for encrypted payload).
+ */
+static struct GNUNET_SERVER_MessageStreamTokenizer *mst;
+
+
+
+/**
+ * Send a message to one of our clients.
+ *
+ * @param client target for the message
+ * @param msg message to transmit
+ * @param can_drop could this message be dropped if the
+ * client's queue is getting too large?
+ */
+static void
+send_to_client (struct Client *client, const struct GNUNET_MessageHeader *msg,
+ int can_drop)
+{
+#if DEBUG_CORE_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Preparing to send %u bytes of message of type %u to client.\n",
+ (unsigned int) ntohs (msg->size),
+ (unsigned int) ntohs (msg->type));
+#endif
+ GNUNET_SERVER_notification_context_unicast (notifier, client->client_handle,
+ msg, can_drop);
+}
+
+
+
+
+
+/**
+ * Send a message to all of our current clients that have
+ * the right options set.
+ *
+ * @param msg message to multicast
+ * @param can_drop can this message be discarded if the queue is too long
+ * @param options mask to use
+ */
+static void
+send_to_all_clients (const struct GNUNET_MessageHeader *msg, int can_drop,
+ int options)
+{
+ struct Client *c;
+
+ c = clients;
+ while (c != NULL)
+ {
+ if (0 != (c->options & options))
+ {
+#if DEBUG_CORE_CLIENT > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending message of type %u to client.\n",
+ (unsigned int) ntohs (msg->type));
+#endif
+ send_to_client (c, msg, can_drop);
+ }
+ c = c->next;
+ }
+}
+
+
+
+/**
+ * Handle CORE_SEND_REQUEST message.
+ */
+static void
+handle_client_send_request (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ const struct SendMessageRequest *req;
+ struct Neighbour *n;
+ struct Client *c;
+ struct ClientActiveRequest *car;
+
+ req = (const struct SendMessageRequest *) message;
+ if (0 ==
+ memcmp (&req->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
+ n = &self;
+ else
+ n = find_neighbour (&req->peer);
+ if ((n == NULL) || (GNUNET_YES != n->is_connected) ||
+ (n->status != PEER_STATE_KEY_CONFIRMED))
+ {
+ /* neighbour must have disconnected since request was issued,
+ * ignore (client will realize it once it processes the
+ * disconnect notification) */
+#if DEBUG_CORE_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Dropped client request for transmission (am disconnected)\n");
+#endif
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# send requests dropped (disconnected)"), 1,
+ GNUNET_NO);
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ return;
+ }
+ c = clients;
+ while ((c != NULL) && (c->client_handle != client))
+ c = c->next;
+ if (c == NULL)
+ {
+ /* client did not send INIT first! */
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ if (c->requests == NULL)
+ c->requests = GNUNET_CONTAINER_multihashmap_create (16);
+#if DEBUG_CORE_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received client transmission request. queueing\n");
+#endif
+ car = GNUNET_CONTAINER_multihashmap_get (c->requests, &req->peer.hashPubKey);
+ if (car == NULL)
+ {
+ /* create new entry */
+ car = GNUNET_malloc (sizeof (struct ClientActiveRequest));
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_put (c->requests,
+ &req->peer.hashPubKey,
+ car,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
+ GNUNET_CONTAINER_DLL_insert (n->active_client_request_head,
+ n->active_client_request_tail, car);
+ car->client = c;
+ }
+ car->deadline = GNUNET_TIME_absolute_ntoh (req->deadline);
+ car->priority = ntohl (req->priority);
+ car->queue_size = ntohl (req->queue_size);
+ car->msize = ntohs (req->size);
+ car->smr_id = req->smr_id;
+ schedule_peer_messages (n);
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+}
+
+
+/**
+ * Notify client about an existing connection to one of our neighbours.
+ */
+static int
+notify_client_about_neighbour (void *cls, const GNUNET_HashCode * key,
+ void *value)
+{
+ struct Client *c = cls;
+ struct Neighbour *n = value;
+ size_t size;
+ char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
+ struct GNUNET_TRANSPORT_ATS_Information *ats;
+ struct ConnectNotifyMessage *cnm;
+
+ size =
+ sizeof (struct ConnectNotifyMessage) +
+ (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
+ if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ /* recovery strategy: throw away performance data */
+ GNUNET_array_grow (n->ats, n->ats_count, 0);
+ size =
+ sizeof (struct ConnectNotifyMessage) +
+ (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
+ }
+ cnm = (struct ConnectNotifyMessage *) buf;
+ cnm->header.size = htons (size);
+ cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
+ cnm->ats_count = htonl (n->ats_count);
+ ats = &cnm->ats;
+ memcpy (ats, n->ats,
+ sizeof (struct GNUNET_TRANSPORT_ATS_Information) * n->ats_count);
+ ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
+ ats[n->ats_count].value = htonl (0);
+ if (n->status == PEER_STATE_KEY_CONFIRMED)
+ {
+#if DEBUG_CORE_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message to client.\n",
+ "NOTIFY_CONNECT");
+#endif
+ cnm->peer = n->peer;
+ send_to_client (c, &cnm->header, GNUNET_NO);
+ }
+ return GNUNET_OK;
+}
+
+
+
+/**
+ * Handle CORE_INIT request.
+ */
+static void
+handle_client_init (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ const struct InitMessage *im;
+ struct InitReplyMessage irm;
+ struct Client *c;
+ uint16_t msize;
+ const uint16_t *types;
+ uint16_t *wtypes;
+ unsigned int i;
+
+#if DEBUG_CORE_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client connecting to core service with `%s' message\n", "INIT");
+#endif
+ /* check that we don't have an entry already */
+ c = clients;
+ while (c != NULL)
+ {
+ if (client == c->client_handle)
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ c = c->next;
+ }
+ msize = ntohs (message->size);
+ if (msize < sizeof (struct InitMessage))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ GNUNET_SERVER_notification_context_add (notifier, client);
+ im = (const struct InitMessage *) message;
+ types = (const uint16_t *) &im[1];
+ msize -= sizeof (struct InitMessage);
+ c = GNUNET_malloc (sizeof (struct Client) + msize);
+ c->client_handle = client;
+ c->next = clients;
+ clients = c;
+ c->tcnt = msize / sizeof (uint16_t);
+ c->types = (const uint16_t *) &c[1];
+ wtypes = (uint16_t *) & c[1];
+ for (i = 0; i < c->tcnt; i++)
+ {
+ wtypes[i] = ntohs (types[i]);
+ my_type_map[wtypes[i] / 32] |= (1 << (wtypes[i] % 32));
+ }
+ if (c->tcnt > 0)
+ broadcast_my_type_map ();
+ c->options = ntohl (im->options);
+#if DEBUG_CORE_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client %p is interested in %u message types\n", c,
+ (unsigned int) c->tcnt);
+#endif
+ /* send init reply message */
+ irm.header.size = htons (sizeof (struct InitReplyMessage));
+ irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
+ irm.reserved = htonl (0);
+ memcpy (&irm.publicKey, &my_public_key,
+ sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
+#if DEBUG_CORE_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message to client.\n",
+ "INIT_REPLY");
+#endif
+ send_to_client (c, &irm.header, GNUNET_NO);
+ if (0 != (c->options & GNUNET_CORE_OPTION_SEND_CONNECT))
+ {
+ /* notify new client about existing neighbours */
+ GNUNET_CONTAINER_multihashmap_iterate (neighbours,
+ ¬ify_client_about_neighbour, c);
+ }
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+}
+
+
+/**
+ * Free client request records.
+ *
+ * @param cls NULL
+ * @param key identity of peer for which this is an active request
+ * @param value the 'struct ClientActiveRequest' to free
+ * @return GNUNET_YES (continue iteration)
+ */
+static int
+destroy_active_client_request (void *cls, const GNUNET_HashCode * key,
+ void *value)
+{
+ struct ClientActiveRequest *car = value;
+ struct Neighbour *n;
+ struct GNUNET_PeerIdentity peer;
+
+ peer.hashPubKey = *key;
+ n = find_neighbour (&peer);
+ GNUNET_assert (NULL != n);
+ GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
+ n->active_client_request_tail, car);
+ GNUNET_free (car);
+ return GNUNET_YES;
+}
+
+
+/**
+ * A client disconnected, clean up.
+ *
+ * @param cls closure
+ * @param client identification of the client
+ */
+static void
+handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
+{
+ struct Client *pos;
+ struct Client *prev;
+ unsigned int i;
+ const uint16_t *wtypes;
+
+ if (client == NULL)
+ return;
+#if DEBUG_CORE_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client %p has disconnected from core service.\n", client);
+#endif
+ prev = NULL;
+ pos = clients;
+ while (pos != NULL)
+ {
+ if (client == pos->client_handle)
+ break;
+ prev = pos;
+ pos = pos->next;
+ }
+ if (pos == NULL)
+ {
+ /* client never sent INIT */
+ return;
+ }
+ if (prev == NULL)
+ clients = pos->next;
+ else
+ prev->next = pos->next;
+ if (pos->requests != NULL)
+ {
+ GNUNET_CONTAINER_multihashmap_iterate (pos->requests,
+ &destroy_active_client_request,
+ NULL);
+ GNUNET_CONTAINER_multihashmap_destroy (pos->requests);
+ }
+ GNUNET_free (pos);
+
+ /* rebuild my_type_map */
+ memset (my_type_map, 0, sizeof (my_type_map));
+ for (pos = clients; NULL != pos; pos = pos->next)
+ {
+ wtypes = (const uint16_t *) &pos[1];
+ for (i = 0; i < pos->tcnt; i++)
+ my_type_map[wtypes[i] / 32] |= (1 << (wtypes[i] % 32));
+ }
+ broadcast_my_type_map ();
+}
+
+
+
+
+
+/**
+ * Handle CORE_SEND request.
+ *
+ * @param cls unused
+ * @param client the client issuing the request
+ * @param message the "struct SendMessage"
+ */
+static void
+handle_client_send (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ const struct SendMessage *sm;
+ struct Neighbour *n;
+ struct MessageEntry *prev;
+ struct MessageEntry *pos;
+ struct MessageEntry *e;
+ struct MessageEntry *min_prio_entry;
+ struct MessageEntry *min_prio_prev;
+ unsigned int min_prio;
+ unsigned int queue_size;
+ uint16_t msize;
+
+ msize = ntohs (message->size);
+ if (msize <
+ sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "msize is %u, should be at least %u (in %s:%d)\n", msize,
+ sizeof (struct SendMessage) +
+ sizeof (struct GNUNET_MessageHeader), __FILE__, __LINE__);
+ GNUNET_break (0);
+ if (client != NULL)
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ sm = (const struct SendMessage *) message;
+ msize -= sizeof (struct SendMessage);
+ if (0 ==
+ memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
+ {
+ /* loopback */
+ GNUNET_SERVER_mst_receive (mst, &self, (const char *) &sm[1], msize,
+ GNUNET_YES, GNUNET_NO);
+ if (client != NULL)
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ return;
+ }
+ n = find_neighbour (&sm->peer);
+ if ((n == NULL) || (GNUNET_YES != n->is_connected) ||
+ (n->status != PEER_STATE_KEY_CONFIRMED))
+ {
+ /* attempt to send message to peer that is not connected anymore
+ * (can happen due to asynchrony) */
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# messages discarded (disconnected)"), 1,
+ GNUNET_NO);
+ if (client != NULL)
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ return;
+ }
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
+ "SEND", (unsigned int) msize, GNUNET_i2s (&sm->peer));
+#endif
+ discard_expired_messages (n);
+ /* bound queue size */
+ /* NOTE: this entire block to bound the queue size should be
+ * obsolete with the new client-request code and the
+ * 'schedule_peer_messages' mechanism; we still have this code in
+ * here for now as a sanity check for the new mechanmism;
+ * ultimately, we should probably simply reject SEND messages that
+ * are not 'approved' (or provide a new core API for very unreliable
+ * delivery that always sends with priority 0). Food for thought. */
+ min_prio = UINT32_MAX;
+ min_prio_entry = NULL;
+ min_prio_prev = NULL;
+ queue_size = 0;
+ prev = NULL;
+ pos = n->messages;
+ while (pos != NULL)
+ {
+ if (pos->priority <= min_prio)
+ {
+ min_prio_entry = pos;
+ min_prio_prev = prev;
+ min_prio = pos->priority;
+ }
+ queue_size++;
+ prev = pos;
+ pos = pos->next;
+ }
+ if (queue_size >= MAX_PEER_QUEUE_SIZE)
+ {
+ /* queue full */
+ if (ntohl (sm->priority) <= min_prio)
+ {
+ /* discard new entry; this should no longer happen! */
+ GNUNET_break (0);
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
+ queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
+ (unsigned int) msize, (unsigned int) ntohs (message->type));
+#endif
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# discarded CORE_SEND requests"),
+ 1, GNUNET_NO);
+
+ if (client != NULL)
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ return;
+ }
+ GNUNET_assert (min_prio_entry != NULL);
+ /* discard "min_prio_entry" */
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Queue full, discarding existing older request\n");
+#endif
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# discarded lower priority CORE_SEND requests"),
+ 1, GNUNET_NO);
+ if (min_prio_prev == NULL)
+ n->messages = min_prio_entry->next;
+ else
+ min_prio_prev->next = min_prio_entry->next;
+ GNUNET_free (min_prio_entry);
+ }
+
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Adding transmission request for `%4s' of size %u to queue\n",
+ GNUNET_i2s (&sm->peer), (unsigned int) msize);
+#endif
+ GNUNET_break (0 == ntohl (sm->reserved));
+ e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
+ e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
+ e->priority = ntohl (sm->priority);
+ e->size = msize;
+ if (GNUNET_YES != (int) ntohl (sm->cork))
+ e->got_slack = GNUNET_YES;
+ memcpy (&e[1], &sm[1], msize);
+
+ /* insert, keep list sorted by deadline */
+ prev = NULL;
+ pos = n->messages;
+ while ((pos != NULL) && (pos->deadline.abs_value < e->deadline.abs_value))
+ {
+ prev = pos;
+ pos = pos->next;
+ }
+ if (prev == NULL)
+ n->messages = e;
+ else
+ prev->next = e;
+ e->next = pos;
+
+ /* consider scheduling now */
+ process_plaintext_neighbour_queue (n);
+ if (client != NULL)
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+}
+
+
+/**
+ * Handle CORE_REQUEST_CONNECT request.
+ *
+ * @param cls unused
+ * @param client the client issuing the request
+ * @param message the "struct ConnectMessage"
+ */
+static void
+handle_client_request_connect (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ const struct ConnectMessage *cm = (const struct ConnectMessage *) message;
+ struct Neighbour *n;
+
+ if (0 ==
+ memcmp (&cm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
+ {
+ /* In this case a client has asked us to connect to ourselves, not really an error! */
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ return;
+ }
+ GNUNET_break (ntohl (cm->reserved) == 0);
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Core received `%s' request for `%4s', will try to establish connection\n",
+ "REQUEST_CONNECT", GNUNET_i2s (&cm->peer));
+#endif
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# connection requests received"), 1,
+ GNUNET_NO);
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ n = find_neighbour (&cm->peer);
+ if ((n == NULL) || (GNUNET_YES != n->is_connected))
+ {
+ GNUNET_TRANSPORT_try_connect (transport, &cm->peer);
+ }
+ else
+ {
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# connection requests ignored (already connected)"),
+ 1, GNUNET_NO);
+ }
+}
+
+
+
+/**
+ * Helper function for handle_client_iterate_peers.
+ *
+ * @param cls the 'struct GNUNET_SERVER_TransmitContext' to queue replies
+ * @param key identity of the connected peer
+ * @param value the 'struct Neighbour' for the peer
+ * @return GNUNET_OK (continue to iterate)
+ */
+static int
+queue_connect_message (void *cls, const GNUNET_HashCode * key, void *value)
+{
+ struct GNUNET_SERVER_TransmitContext *tc = cls;
+ struct Neighbour *n = value;
+ char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
+ struct GNUNET_TRANSPORT_ATS_Information *ats;
+ size_t size;
+ struct ConnectNotifyMessage *cnm;
+
+ cnm = (struct ConnectNotifyMessage *) buf;
+ if (n->status != PEER_STATE_KEY_CONFIRMED)
+ return GNUNET_OK;
+ size =
+ sizeof (struct ConnectNotifyMessage) +
+ (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
+ if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ /* recovery strategy: throw away performance data */
+ GNUNET_array_grow (n->ats, n->ats_count, 0);
+ size =
+ sizeof (struct PeerStatusNotifyMessage) +
+ n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
+ }
+ cnm = (struct ConnectNotifyMessage *) buf;
+ cnm->header.size = htons (size);
+ cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
+ cnm->ats_count = htonl (n->ats_count);
+ ats = &cnm->ats;
+ memcpy (ats, n->ats,
+ n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
+ ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
+ ats[n->ats_count].value = htonl (0);
+#if DEBUG_CORE_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message to client.\n",
+ "NOTIFY_CONNECT");
+#endif
+ cnm->peer = n->peer;
+ GNUNET_SERVER_transmit_context_append_message (tc, &cnm->header);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Handle CORE_ITERATE_PEERS request.
+ *
+ * @param cls unused
+ * @param client client sending the iteration request
+ * @param message iteration request message
+ */
+static void
+handle_client_iterate_peers (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct GNUNET_MessageHeader done_msg;
+ struct GNUNET_SERVER_TransmitContext *tc;
+ int msize;
+
+ /* notify new client about existing neighbours */
+
+ msize = ntohs (message->size);
+ tc = GNUNET_SERVER_transmit_context_create (client);
+ if (msize == sizeof (struct GNUNET_MessageHeader))
+ GNUNET_CONTAINER_multihashmap_iterate (neighbours, &queue_connect_message,
+ tc);
+ else
+ GNUNET_break (0);
+
+ done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
+ done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END);
+ GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
+ GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
+}
+
+
+/**
+ * Handle CORE_PEER_CONNECTED request. Notify client about existing neighbours.
+ *
+ * @param cls unused
+ * @param client client sending the iteration request
+ * @param message iteration request message
+ */
+static void
+handle_client_have_peer (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct GNUNET_MessageHeader done_msg;
+ struct GNUNET_SERVER_TransmitContext *tc;
+ struct GNUNET_PeerIdentity *peer;
+
+ tc = GNUNET_SERVER_transmit_context_create (client);
+ peer = (struct GNUNET_PeerIdentity *) &message[1];
+ GNUNET_CONTAINER_multihashmap_get_multiple (neighbours, &peer->hashPubKey,
+ &queue_connect_message, tc);
+ done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
+ done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END);
+ GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
+ GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
+}
+
+
+/**
+ * Handle REQUEST_INFO request.
+ *
+ * @param cls unused
+ * @param client client sending the request
+ * @param message iteration request message
+ */
+static void
+handle_client_request_info (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ const struct RequestInfoMessage *rcm;
+ struct Client *pos;
+ struct Neighbour *n;
+ struct ConfigurationInfoMessage cim;
+ int32_t want_reserv;
+ int32_t got_reserv;
+ unsigned long long old_preference;
+ struct GNUNET_TIME_Relative rdelay;
+
+ rdelay = GNUNET_TIME_relative_get_zero ();
+#if DEBUG_CORE_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core service receives `%s' request.\n",
+ "REQUEST_INFO");
+#endif
+ pos = clients;
+ while (pos != NULL)
+ {
+ if (client == pos->client_handle)
+ break;
+ pos = pos->next;
+ }
+ if (pos == NULL)
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+
+ rcm = (const struct RequestInfoMessage *) message;
+ n = find_neighbour (&rcm->peer);
+ memset (&cim, 0, sizeof (cim));
+ if ((n != NULL) && (GNUNET_YES == n->is_connected))
+ {
+ want_reserv = ntohl (rcm->reserve_inbound);
+ if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
+ {
+ n->bw_out_internal_limit = rcm->limit_outbound;
+ if (n->bw_out.value__ !=
+ GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
+ n->bw_out_external_limit).value__)
+ {
+ n->bw_out =
+ GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
+ n->bw_out_external_limit);
+ GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
+ n->bw_out);
+ GNUNET_TRANSPORT_set_quota (transport, &n->peer, n->bw_in, n->bw_out);
+ handle_peer_status_change (n);
+ }
+ }
+ if (want_reserv < 0)
+ {
+ got_reserv = want_reserv;
+ }
+ else if (want_reserv > 0)
+ {
+ rdelay =
+ GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
+ want_reserv);
+ if (rdelay.rel_value == 0)
+ got_reserv = want_reserv;
+ else
+ got_reserv = 0; /* all or nothing */
+ }
+ else
+ got_reserv = 0;
+ GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window, got_reserv);
+ old_preference = n->current_preference;
+ n->current_preference += GNUNET_ntohll (rcm->preference_change);
+ if (old_preference > n->current_preference)
+ {
+ /* overflow; cap at maximum value */
+ n->current_preference = ULLONG_MAX;
+ }
+ update_preference_sum (n->current_preference - old_preference);
+#if DEBUG_CORE_QUOTA
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received reservation request for %d bytes for peer `%4s', reserved %d bytes, suggesting delay of %llu ms\n",
+ (int) want_reserv, GNUNET_i2s (&rcm->peer), (int) got_reserv,
+ (unsigned long long) rdelay.rel_value);
+#endif
+ cim.reserved_amount = htonl (got_reserv);
+ cim.reserve_delay = GNUNET_TIME_relative_hton (rdelay);
+ cim.bw_out = n->bw_out;
+ cim.preference = n->current_preference;
+ }
+ else
+ {
+ /* Technically, this COULD happen (due to asynchronous behavior),
+ * but it should be rare, so we should generate an info event
+ * to help diagnosis of serious errors that might be masked by this */
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ _
+ ("Client asked for preference change with peer `%s', which is not connected!\n"),
+ GNUNET_i2s (&rcm->peer));
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ return;
+ }
+ cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
+ cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
+ cim.peer = rcm->peer;
+ cim.rim_id = rcm->rim_id;
+#if DEBUG_CORE_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message to client.\n",
+ "CONFIGURATION_INFO");
+#endif
+ send_to_client (pos, &cim.header, GNUNET_NO);
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+}
+
+
+
+
+/**
+ * Send a P2P message to a client.
+ *
+ * @param sender who sent us the message?
+ * @param client who should we give the message to?
+ * @param m contains the message to transmit
+ * @param msize number of bytes in buf to transmit
+ */
+static void
+send_p2p_message_to_client (struct Neighbour *sender, struct Client *client,
+ const void *m, size_t msize)
+{
+ size_t size =
+ msize + sizeof (struct NotifyTrafficMessage) +
+ (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
+ char buf[size];
+ struct NotifyTrafficMessage *ntm;
+ struct GNUNET_TRANSPORT_ATS_Information *ats;
+
+ GNUNET_assert (GNUNET_YES == sender->is_connected);
+ GNUNET_break (sender->status == PEER_STATE_KEY_CONFIRMED);
+ if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ /* recovery strategy: throw performance data away... */
+ GNUNET_array_grow (sender->ats, sender->ats_count, 0);
+ size =
+ msize + sizeof (struct NotifyTrafficMessage) +
+ (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
+ }
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Core service passes message from `%4s' of type %u to client.\n",
+ GNUNET_i2s (&sender->peer),
+ (unsigned int)
+ ntohs (((const struct GNUNET_MessageHeader *) m)->type));
+#endif
+ ntm = (struct NotifyTrafficMessage *) buf;
+ ntm->header.size = htons (size);
+ ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
+ ntm->ats_count = htonl (sender->ats_count);
+ ntm->peer = sender->peer;
+ ats = &ntm->ats;
+ memcpy (ats, sender->ats,
+ sizeof (struct GNUNET_TRANSPORT_ATS_Information) * sender->ats_count);
+ ats[sender->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
+ ats[sender->ats_count].value = htonl (0);
+ memcpy (&ats[sender->ats_count + 1], m, msize);
+ send_to_client (client, &ntm->header, GNUNET_YES);
+}
+
+
+
+
+/**
+ * Deliver P2P message to interested clients.
+ *
+ * @param cls always NULL
+ * @param client who sent us the message (struct Neighbour)
+ * @param m the message
+ */
+static void
+deliver_message (void *cls, void *client, const struct GNUNET_MessageHeader *m)
+{
+ struct Neighbour *sender = client;
+ size_t msize = ntohs (m->size);
+ char buf[256];
+ struct Client *cpos;
+ uint16_t type;
+ unsigned int tpos;
+ int deliver_full;
+ int dropped;
+
+ GNUNET_break (sender->status == PEER_STATE_KEY_CONFIRMED);
+ type = ntohs (m->type);
+#if DEBUG_CORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received encapsulated message of type %u and size %u from `%4s'\n",
+ (unsigned int) type, ntohs (m->size), GNUNET_i2s (&sender->peer));
+#endif
+ GNUNET_snprintf (buf, sizeof (buf),
+ gettext_noop ("# bytes of messages of type %u received"),
+ (unsigned int) type);
+ GNUNET_STATISTICS_update (stats, buf, msize, GNUNET_NO);
+ if ((GNUNET_MESSAGE_TYPE_CORE_BINARY_TYPE_MAP == type) ||
+ (GNUNET_MESSAGE_TYPE_CORE_COMPRESSED_TYPE_MAP == type))
+ {
+ /* FIXME: update message type map for 'Neighbour' */
+ return;
+ }
+ dropped = GNUNET_YES;
+ cpos = clients;
+ while (cpos != NULL)
+ {
+ deliver_full = GNUNET_NO;
+ if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
+ deliver_full = GNUNET_YES;
+ else
+ {
+ for (tpos = 0; tpos < cpos->tcnt; tpos++)
+ {
+ if (type != cpos->types[tpos])
+ continue;
+ deliver_full = GNUNET_YES;
+ break;
+ }
+ }
+ if (GNUNET_YES == deliver_full)
+ {
+ send_p2p_message_to_client (sender, cpos, m, msize);
+ dropped = GNUNET_NO;
+ }
+ else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
+ {
+ send_p2p_message_to_client (sender, cpos, m,
+ sizeof (struct GNUNET_MessageHeader));
+ }
+ cpos = cpos->next;
+ }
+ if (dropped == GNUNET_YES)
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Message of type %u from `%4s' not delivered to any client.\n",
+ (unsigned int) type, GNUNET_i2s (&sender->peer));
+#endif
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# messages not delivered to any client"), 1,
+ GNUNET_NO);
+ }
+}
+
+
+
+void
+GSC_CLIENTS_init (struct GNUNET_SERVER_Handle *server)
+{
+ static const struct GNUNET_SERVER_MessageHandler handlers[] = {
+ {&handle_client_init, NULL,
+ GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
+ {&handle_client_iterate_peers, NULL,
+ GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS,
+ sizeof (struct GNUNET_MessageHeader)},
+ {&handle_client_have_peer, NULL,
+ GNUNET_MESSAGE_TYPE_CORE_PEER_CONNECTED,
+ sizeof (struct GNUNET_MessageHeader) +
+ sizeof (struct GNUNET_PeerIdentity)},
+ {&handle_client_request_info, NULL,
+ GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
+ sizeof (struct RequestInfoMessage)},
+ {&handle_client_send_request, NULL,
+ GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST,
+ sizeof (struct SendMessageRequest)},
+ {&handle_client_send, NULL,
+ GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
+ {&handle_client_request_connect, NULL,
+ GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
+ sizeof (struct ConnectMessage)},
+ {NULL, NULL, 0, 0}
+ };
+
+ /* setup notification */
+ notifier =
+ GNUNET_SERVER_notification_context_create (server, MAX_NOTIFY_QUEUE);
+ GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
+ GNUNET_SERVER_add_handlers (server, handlers);
+ mst = GNUNET_SERVER_mst_create (&deliver_message, NULL);
+}
+
+
+void
+GSC_CLIENTS_done ()
+{
+ struct Client *c;
+
+ while (NULL != (c = clients))
+ handle_client_disconnect (NULL, c->client_handle);
+ GNUNET_SERVER_notification_context_destroy (notifier);
+ notifier = NULL;
+ if (mst != NULL)
+ {
+ GNUNET_SERVER_mst_destroy (mst);
+ mst = NULL;
+ }
+
+}
--- /dev/null
+
+/**
+ * Our private key.
+ */
+static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
+
+/**
+ * Our public key.
+ */
+static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
+
+
+/**
+ * Derive an authentication key from "set key" information
+ */
+static void
+derive_auth_key (struct GNUNET_CRYPTO_AuthKey *akey,
+ const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
+ struct GNUNET_TIME_Absolute creation_time)
+{
+ static const char ctx[] = "authentication key";
+ struct GNUNET_TIME_AbsoluteNBO ctbe;
+
+
+ ctbe = GNUNET_TIME_absolute_hton (creation_time);
+ GNUNET_CRYPTO_hmac_derive_key (akey, skey, &seed, sizeof (seed), &skey->key,
+ sizeof (skey->key), &ctbe, sizeof (ctbe), ctx,
+ sizeof (ctx), NULL);
+}
+
+
+/**
+ * Derive an IV from packet information
+ */
+static void
+derive_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
+ const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
+ const struct GNUNET_PeerIdentity *identity)
+{
+ static const char ctx[] = "initialization vector";
+
+ GNUNET_CRYPTO_aes_derive_iv (iv, skey, &seed, sizeof (seed),
+ &identity->hashPubKey.bits,
+ sizeof (identity->hashPubKey.bits), ctx,
+ sizeof (ctx), NULL);
+}
+
+/**
+ * Derive an IV from pong packet information
+ */
+static void
+derive_pong_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
+ const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
+ uint32_t challenge, const struct GNUNET_PeerIdentity *identity)
+{
+ static const char ctx[] = "pong initialization vector";
+
+ GNUNET_CRYPTO_aes_derive_iv (iv, skey, &seed, sizeof (seed),
+ &identity->hashPubKey.bits,
+ sizeof (identity->hashPubKey.bits), &challenge,
+ sizeof (challenge), ctx, sizeof (ctx), NULL);
+}
+
+
+/**
+ * Encrypt size bytes from in and write the result to out. Use the
+ * key for outbound traffic of the given neighbour.
+ *
+ * @param n neighbour we are sending to
+ * @param iv initialization vector to use
+ * @param in ciphertext
+ * @param out plaintext
+ * @param size size of in/out
+ * @return GNUNET_OK on success
+ */
+static int
+do_encrypt (struct Neighbour *n,
+ const struct GNUNET_CRYPTO_AesInitializationVector *iv,
+ const void *in, void *out, size_t size)
+{
+ if (size != (uint16_t) size)
+ {
+ GNUNET_break (0);
+ return GNUNET_NO;
+ }
+ GNUNET_assert (size ==
+ GNUNET_CRYPTO_aes_encrypt (in, (uint16_t) size,
+ &n->encrypt_key, iv, out));
+ GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size,
+ GNUNET_NO);
+#if DEBUG_CORE > 2
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Encrypted %u bytes for `%4s' using key %u, IV %u\n",
+ (unsigned int) size, GNUNET_i2s (&n->peer),
+ (unsigned int) n->encrypt_key.crc32, GNUNET_CRYPTO_crc32_n (iv,
+ sizeof
+ (iv)));
+#endif
+ return GNUNET_OK;
+}
+
+
+
+
+/**
+ * Decrypt size bytes from in and write the result to out. Use the
+ * key for inbound traffic of the given neighbour. This function does
+ * NOT do any integrity-checks on the result.
+ *
+ * @param n neighbour we are receiving from
+ * @param iv initialization vector to use
+ * @param in ciphertext
+ * @param out plaintext
+ * @param size size of in/out
+ * @return GNUNET_OK on success
+ */
+static int
+do_decrypt (struct Neighbour *n,
+ const struct GNUNET_CRYPTO_AesInitializationVector *iv,
+ const void *in, void *out, size_t size)
+{
+ if (size != (uint16_t) size)
+ {
+ GNUNET_break (0);
+ return GNUNET_NO;
+ }
+ if ((n->status != PEER_STATE_KEY_RECEIVED) &&
+ (n->status != PEER_STATE_KEY_CONFIRMED))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (size !=
+ GNUNET_CRYPTO_aes_decrypt (in, (uint16_t) size, &n->decrypt_key, iv, out))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes decrypted"), size,
+ GNUNET_NO);
+#if DEBUG_CORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Decrypted %u bytes from `%4s' using key %u, IV %u\n",
+ (unsigned int) size, GNUNET_i2s (&n->peer),
+ (unsigned int) n->decrypt_key.crc32, GNUNET_CRYPTO_crc32_n (iv,
+ sizeof
+ (*iv)));
+#endif
+ return GNUNET_OK;
+}
+
+
+
+/**
+ * We received an encrypted message. Decrypt, validate and
+ * pass on to the appropriate clients.
+ *
+ * @param n target of the message
+ * @param m encrypted message
+ * @param ats performance data
+ * @param ats_count number of entries in ats (excluding 0-termination)
+ */
+static void
+handle_encrypted_message (struct Neighbour *n, const struct EncryptedMessage *m,
+ const struct GNUNET_TRANSPORT_ATS_Information *ats,
+ uint32_t ats_count)
+{
+ size_t size = ntohs (m->header.size);
+ char buf[size];
+ struct EncryptedMessage *pt; /* plaintext */
+ GNUNET_HashCode ph;
+ uint32_t snum;
+ struct GNUNET_TIME_Absolute t;
+ struct GNUNET_CRYPTO_AesInitializationVector iv;
+ struct GNUNET_CRYPTO_AuthKey auth_key;
+
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Core service receives `%s' request from `%4s'.\n",
+ "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
+#endif
+ /* validate hash */
+ derive_auth_key (&auth_key, &n->decrypt_key, m->iv_seed,
+ n->decrypt_key_created);
+ GNUNET_CRYPTO_hmac (&auth_key, &m->sequence_number,
+ size - ENCRYPTED_HEADER_SIZE, &ph);
+#if DEBUG_HANDSHAKE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Re-Authenticated %u bytes of ciphertext (`%u'): `%s'\n",
+ (unsigned int) size - ENCRYPTED_HEADER_SIZE,
+ GNUNET_CRYPTO_crc32_n (&m->sequence_number,
+ size - ENCRYPTED_HEADER_SIZE),
+ GNUNET_h2s (&ph));
+#endif
+
+ if (0 != memcmp (&ph, &m->hmac, sizeof (GNUNET_HashCode)))
+ {
+ /* checksum failed */
+ GNUNET_break_op (0);
+ return;
+ }
+ derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
+ /* decrypt */
+ if (GNUNET_OK !=
+ do_decrypt (n, &iv, &m->sequence_number, &buf[ENCRYPTED_HEADER_SIZE],
+ size - ENCRYPTED_HEADER_SIZE))
+ return;
+ pt = (struct EncryptedMessage *) buf;
+
+ /* validate sequence number */
+ snum = ntohl (pt->sequence_number);
+ if (n->last_sequence_number_received == snum)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Received duplicate message, ignoring.\n");
+ /* duplicate, ignore */
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# bytes dropped (duplicates)"),
+ size, GNUNET_NO);
+ return;
+ }
+ if ((n->last_sequence_number_received > snum) &&
+ (n->last_sequence_number_received - snum > 32))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Received ancient out of sequence message, ignoring.\n");
+ /* ancient out of sequence, ignore */
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# bytes dropped (out of sequence)"), size,
+ GNUNET_NO);
+ return;
+ }
+ if (n->last_sequence_number_received > snum)
+ {
+ unsigned int rotbit = 1 << (n->last_sequence_number_received - snum - 1);
+
+ if ((n->last_packets_bitmap & rotbit) != 0)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Received duplicate message, ignoring.\n");
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# bytes dropped (duplicates)"),
+ size, GNUNET_NO);
+ /* duplicate, ignore */
+ return;
+ }
+ n->last_packets_bitmap |= rotbit;
+ }
+ if (n->last_sequence_number_received < snum)
+ {
+ int shift = (snum - n->last_sequence_number_received);
+
+ if (shift >= 8 * sizeof (n->last_packets_bitmap))
+ n->last_packets_bitmap = 0;
+ else
+ n->last_packets_bitmap <<= shift;
+ n->last_sequence_number_received = snum;
+ }
+
+ /* check timestamp */
+ t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
+ if (GNUNET_TIME_absolute_get_duration (t).rel_value >
+ MAX_MESSAGE_AGE.rel_value)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ _("Message received far too old (%llu ms). Content ignored.\n"),
+ GNUNET_TIME_absolute_get_duration (t).rel_value);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# bytes dropped (ancient message)"), size,
+ GNUNET_NO);
+ return;
+ }
+
+ /* process decrypted message(s) */
+ if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
+ {
+#if DEBUG_CORE_SET_QUOTA
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received %u b/s as new inbound limit for peer `%4s'\n",
+ (unsigned int) ntohl (pt->inbound_bw_limit.value__),
+ GNUNET_i2s (&n->peer));
+#endif
+ n->bw_out_external_limit = pt->inbound_bw_limit;
+ n->bw_out =
+ GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
+ n->bw_out_internal_limit);
+ GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
+ n->bw_out);
+ GNUNET_TRANSPORT_set_quota (transport, &n->peer, n->bw_in, n->bw_out);
+ }
+ n->last_activity = GNUNET_TIME_absolute_get ();
+ if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (n->keep_alive_task);
+ n->keep_alive_task =
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide
+ (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
+ 2), &send_keep_alive, n);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# bytes of payload decrypted"),
+ size - sizeof (struct EncryptedMessage), GNUNET_NO);
+ handle_peer_status_change (n);
+ update_neighbour_performance (n, ats, ats_count);
+ if (GNUNET_OK !=
+ GNUNET_SERVER_mst_receive (mst, n, &buf[sizeof (struct EncryptedMessage)],
+ size - sizeof (struct EncryptedMessage),
+ GNUNET_YES, GNUNET_NO))
+ GNUNET_break_op (0);
+}
+
+
+/**
+ * Wrapper around 'free_neighbour'; helper for 'cleaning_task'.
+ */
+static int
+free_neighbour_helper (void *cls, const GNUNET_HashCode * key, void *value)
+{
+ struct Neighbour *n = value;
+
+ free_neighbour (n);
+ return GNUNET_OK;
+}
+
+
+int
+GSC_CRYPTO_init ()
+{
+ char *keyfile;
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_filename (GSC_cfg, "GNUNETD", "HOSTKEY",
+ &keyfile))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("Core service is lacking HOSTKEY configuration setting. Exiting.\n"));
+ return GNUNET_SYSERR;
+ }
+ my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
+ GNUNET_free (keyfile);
+ if (my_private_key == NULL)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Core service could not access hostkey. Exiting.\n"));
+ return GNUNET_SYSERR;
+ }
+ GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
+ GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
+ &my_identity.hashPubKey);
+
+ return GNUNET_OK;
+}
+
+
+void
+GSC_CRYPTO_done ()
+{
+ if (my_private_key != NULL)
+ GNUNET_CRYPTO_rsa_key_free (my_private_key);
+}
--- /dev/null
+/* code that should be moved outside of core/ entirely */
+
+/**
+ * Merge the given performance data with the data we currently
+ * track for the given neighbour.
+ *
+ * @param n neighbour
+ * @param ats new performance data
+ * @param ats_count number of records in ats
+ */
+static void
+update_neighbour_performance (struct Neighbour *n,
+ const struct GNUNET_TRANSPORT_ATS_Information
+ *ats, uint32_t ats_count)
+{
+ uint32_t i;
+ unsigned int j;
+
+ if (ats_count == 0)
+ return;
+ for (i = 0; i < ats_count; i++)
+ {
+ for (j = 0; j < n->ats_count; j++)
+ {
+ if (n->ats[j].type == ats[i].type)
+ {
+ n->ats[j].value = ats[i].value;
+ break;
+ }
+ }
+ if (j == n->ats_count)
+ {
+ GNUNET_array_append (n->ats, n->ats_count, ats[i]);
+ }
+ }
+}
+
+
+
--- /dev/null
+
+/**
+ * We're sending an (encrypted) PING to the other peer to check if he
+ * can decrypt. The other peer should respond with a PONG with the
+ * same content, except this time encrypted with the receiver's key.
+ */
+struct PingMessage
+{
+ /**
+ * Message type is CORE_PING.
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * Seed for the IV
+ */
+ uint32_t iv_seed GNUNET_PACKED;
+
+ /**
+ * Intended target of the PING, used primarily to check
+ * that decryption actually worked.
+ */
+ struct GNUNET_PeerIdentity target;
+
+ /**
+ * Random number chosen to make reply harder.
+ */
+ uint32_t challenge GNUNET_PACKED;
+};
+
+
+
+/**
+ * Response to a PING. Includes data from the original PING
+ * plus initial bandwidth quota information.
+ */
+struct PongMessage
+{
+ /**
+ * Message type is CORE_PONG.
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * Seed for the IV
+ */
+ uint32_t iv_seed GNUNET_PACKED;
+
+ /**
+ * Random number to make faking the reply harder. Must be
+ * first field after header (this is where we start to encrypt!).
+ */
+ uint32_t challenge GNUNET_PACKED;
+
+ /**
+ * Desired bandwidth (how much we should send to this
+ * peer / how much is the sender willing to receive).
+ */
+ struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
+
+ /**
+ * Intended target of the PING, used primarily to check
+ * that decryption actually worked.
+ */
+ struct GNUNET_PeerIdentity target;
+};
+
+
+/**
+ * Message transmitted to set (or update) a session key.
+ */
+struct SetKeyMessage
+{
+
+ /**
+ * Message type is either CORE_SET_KEY.
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * Status of the sender (should be in "enum PeerStateMachine"), nbo.
+ */
+ int32_t sender_status GNUNET_PACKED;
+
+ /**
+ * Purpose of the signature, will be
+ * GNUNET_SIGNATURE_PURPOSE_SET_KEY.
+ */
+ struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
+
+ /**
+ * At what time was this key created?
+ */
+ struct GNUNET_TIME_AbsoluteNBO creation_time;
+
+ /**
+ * The encrypted session key.
+ */
+ struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
+
+ /**
+ * Who is the intended recipient?
+ */
+ struct GNUNET_PeerIdentity target;
+
+ /**
+ * Signature of the stuff above (starting at purpose).
+ */
+ struct GNUNET_CRYPTO_RsaSignature signature;
+
+};
+
+
+/**
+ * Handle to peerinfo service.
+ */
+static struct GNUNET_PEERINFO_Handle *peerinfo;
+
+
+
+/**
+ * We received a PING message. Validate and transmit
+ * PONG.
+ *
+ * @param n sender of the PING
+ * @param m the encrypted PING message itself
+ * @param ats performance data
+ * @param ats_count number of entries in ats (excluding 0-termination)
+ */
+static void
+handle_ping (struct Neighbour *n, const struct PingMessage *m,
+ const struct GNUNET_TRANSPORT_ATS_Information *ats,
+ uint32_t ats_count)
+{
+ struct PingMessage t;
+ struct PongMessage tx;
+ struct PongMessage *tp;
+ struct MessageEntry *me;
+ struct GNUNET_CRYPTO_AesInitializationVector iv;
+
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Core service receives `%s' request from `%4s'.\n", "PING",
+ GNUNET_i2s (&n->peer));
+#endif
+ derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
+ if (GNUNET_OK !=
+ do_decrypt (n, &iv, &m->target, &t.target,
+ sizeof (struct PingMessage) - ((void *) &m->target -
+ (void *) m)))
+ return;
+#if DEBUG_HANDSHAKE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u, IV %u (salt %u)\n",
+ "PING", GNUNET_i2s (&t.target), (unsigned int) t.challenge,
+ (unsigned int) n->decrypt_key.crc32, GNUNET_CRYPTO_crc32_n (&iv,
+ sizeof
+ (iv)),
+ m->iv_seed);
+#endif
+ GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages decrypted"),
+ 1, GNUNET_NO);
+ if (0 !=
+ memcmp (&t.target, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
+ {
+ char sender[9];
+ char peer[9];
+
+ GNUNET_snprintf (sender, sizeof (sender), "%8s", GNUNET_i2s (&n->peer));
+ GNUNET_snprintf (peer, sizeof (peer), "%8s", GNUNET_i2s (&t.target));
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("Received PING from `%s' for different identity: I am `%s', PONG identity: `%s'\n"),
+ sender, GNUNET_i2s (&my_identity), peer);
+ GNUNET_break_op (0);
+ return;
+ }
+ update_neighbour_performance (n, ats, ats_count);
+ me = GNUNET_malloc (sizeof (struct MessageEntry) +
+ sizeof (struct PongMessage));
+ GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head, n->encrypted_tail,
+ n->encrypted_tail, me);
+ me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
+ me->priority = PONG_PRIORITY;
+ me->size = sizeof (struct PongMessage);
+ tx.inbound_bw_limit = n->bw_in;
+ tx.challenge = t.challenge;
+ tx.target = t.target;
+ tp = (struct PongMessage *) &me[1];
+ tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
+ tp->header.size = htons (sizeof (struct PongMessage));
+ tp->iv_seed =
+ GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
+ derive_pong_iv (&iv, &n->encrypt_key, tp->iv_seed, t.challenge, &n->peer);
+ do_encrypt (n, &iv, &tx.challenge, &tp->challenge,
+ sizeof (struct PongMessage) - ((void *) &tp->challenge -
+ (void *) tp));
+ GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages created"), 1,
+ GNUNET_NO);
+#if DEBUG_HANDSHAKE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Encrypting `%s' with challenge %u using key %u, IV %u (salt %u)\n",
+ "PONG", (unsigned int) t.challenge,
+ (unsigned int) n->encrypt_key.crc32, GNUNET_CRYPTO_crc32_n (&iv,
+ sizeof
+ (iv)),
+ tp->iv_seed);
+#endif
+ /* trigger queue processing */
+ process_encrypted_neighbour_queue (n);
+}
+
+
+/**
+ * We received a PONG message. Validate and update our status.
+ *
+ * @param n sender of the PONG
+ * @param m the encrypted PONG message itself
+ * @param ats performance data
+ * @param ats_count number of entries in ats (excluding 0-termination)
+ */
+static void
+handle_pong (struct Neighbour *n, const struct PongMessage *m,
+ const struct GNUNET_TRANSPORT_ATS_Information *ats,
+ uint32_t ats_count)
+{
+ struct PongMessage t;
+ struct ConnectNotifyMessage *cnm;
+ struct GNUNET_CRYPTO_AesInitializationVector iv;
+ char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
+ struct GNUNET_TRANSPORT_ATS_Information *mats;
+ size_t size;
+
+#if DEBUG_HANDSHAKE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Core service receives `%s' response from `%4s'.\n", "PONG",
+ GNUNET_i2s (&n->peer));
+#endif
+ /* mark as garbage, just to be sure */
+ memset (&t, 255, sizeof (t));
+ derive_pong_iv (&iv, &n->decrypt_key, m->iv_seed, n->ping_challenge,
+ &my_identity);
+ if (GNUNET_OK !=
+ do_decrypt (n, &iv, &m->challenge, &t.challenge,
+ sizeof (struct PongMessage) - ((void *) &m->challenge -
+ (void *) m)))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages decrypted"),
+ 1, GNUNET_NO);
+#if DEBUG_HANDSHAKE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Decrypted `%s' from `%4s' with challenge %u using key %u, IV %u (salt %u)\n",
+ "PONG", GNUNET_i2s (&t.target), (unsigned int) t.challenge,
+ (unsigned int) n->decrypt_key.crc32, GNUNET_CRYPTO_crc32_n (&iv,
+ sizeof
+ (iv)),
+ m->iv_seed);
+#endif
+ if ((0 != memcmp (&t.target, &n->peer, sizeof (struct GNUNET_PeerIdentity)))
+ || (n->ping_challenge != t.challenge))
+ {
+ /* PONG malformed */
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
+ "PONG", GNUNET_i2s (&n->peer),
+ (unsigned int) n->ping_challenge);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received malformed `%s' received from `%4s' with challenge %u\n",
+ "PONG", GNUNET_i2s (&t.target), (unsigned int) t.challenge);
+#endif
+ GNUNET_break_op (n->ping_challenge != t.challenge);
+ return;
+ }
+ switch (n->status)
+ {
+ case PEER_STATE_DOWN:
+ GNUNET_break (0); /* should be impossible */
+ return;
+ case PEER_STATE_KEY_SENT:
+ GNUNET_break (0); /* should be impossible, how did we decrypt? */
+ return;
+ case PEER_STATE_KEY_RECEIVED:
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# Session keys confirmed via PONG"), 1,
+ GNUNET_NO);
+ n->status = PEER_STATE_KEY_CONFIRMED;
+ {
+ struct GNUNET_MessageHeader *hdr;
+
+ hdr = compute_type_map_message ();
+ send_type_map_to_neighbour (hdr, &n->peer.hashPubKey, n);
+ GNUNET_free (hdr);
+ }
+ if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
+ {
+ n->bw_out_external_limit = t.inbound_bw_limit;
+ n->bw_out =
+ GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
+ n->bw_out_internal_limit);
+ GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
+ n->bw_out);
+ GNUNET_TRANSPORT_set_quota (transport, &n->peer, n->bw_in, n->bw_out);
+ }
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Confirmed key via `%s' message for peer `%4s'\n", "PONG",
+ GNUNET_i2s (&n->peer));
+#endif
+ if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
+ n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ update_neighbour_performance (n, ats, ats_count);
+ size =
+ sizeof (struct ConnectNotifyMessage) +
+ (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
+ if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ /* recovery strategy: throw away performance data */
+ GNUNET_array_grow (n->ats, n->ats_count, 0);
+ size =
+ sizeof (struct PeerStatusNotifyMessage) +
+ n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
+ }
+ cnm = (struct ConnectNotifyMessage *) buf;
+ cnm->header.size = htons (size);
+ cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
+ cnm->ats_count = htonl (n->ats_count);
+ cnm->peer = n->peer;
+ mats = &cnm->ats;
+ memcpy (mats, n->ats,
+ n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
+ mats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
+ mats[n->ats_count].value = htonl (0);
+ send_to_all_clients (&cnm->header, GNUNET_NO,
+ GNUNET_CORE_OPTION_SEND_CONNECT);
+ process_encrypted_neighbour_queue (n);
+ /* fall-through! */
+ case PEER_STATE_KEY_CONFIRMED:
+ n->last_activity = GNUNET_TIME_absolute_get ();
+ if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (n->keep_alive_task);
+ n->keep_alive_task =
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide
+ (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
+ 2), &send_keep_alive, n);
+ handle_peer_status_change (n);
+ break;
+ default:
+ GNUNET_break (0);
+ break;
+ }
+}
+
+
+/**
+ * We received a SET_KEY message. Validate and update
+ * our key material and status.
+ *
+ * @param n the neighbour from which we received message m
+ * @param m the set key message we received
+ * @param ats performance data
+ * @param ats_count number of entries in ats (excluding 0-termination)
+ */
+static void
+handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m,
+ const struct GNUNET_TRANSPORT_ATS_Information *ats,
+ uint32_t ats_count)
+{
+ struct SetKeyMessage *m_cpy;
+ struct GNUNET_TIME_Absolute t;
+ struct GNUNET_CRYPTO_AesSessionKey k;
+ struct PingMessage *ping;
+ struct PongMessage *pong;
+ enum PeerStateMachine sender_status;
+
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Core service receives `%s' request from `%4s'.\n", "SET_KEY",
+ GNUNET_i2s (&n->peer));
+#endif
+ if (n->public_key == NULL)
+ {
+ if (n->pitr != NULL)
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
+ "SET_KEY");
+#endif
+ return;
+ }
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
+#endif
+ m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
+ memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
+ /* lookup n's public key, then try again */
+ GNUNET_assert (n->skm == NULL);
+ n->skm = m_cpy;
+ n->pitr =
+ GNUNET_PEERINFO_iterate (peerinfo, &n->peer, GNUNET_TIME_UNIT_MINUTES,
+ &process_hello_retry_handle_set_key, n);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# SET_KEY messages deferred (need public key)"),
+ 1, GNUNET_NO);
+ return;
+ }
+ if (0 !=
+ memcmp (&m->target, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ _
+ ("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
+ "SET_KEY", GNUNET_i2s (&m->target));
+ return;
+ }
+ if ((ntohl (m->purpose.size) !=
+ sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
+ sizeof (struct GNUNET_TIME_AbsoluteNBO) +
+ sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
+ sizeof (struct GNUNET_PeerIdentity)) ||
+ (GNUNET_OK !=
+ GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY, &m->purpose,
+ &m->signature, n->public_key)))
+ {
+ /* invalid signature */
+ GNUNET_break_op (0);
+ return;
+ }
+ t = GNUNET_TIME_absolute_ntoh (m->creation_time);
+ if (((n->status == PEER_STATE_KEY_RECEIVED) ||
+ (n->status == PEER_STATE_KEY_CONFIRMED)) &&
+ (t.abs_value < n->decrypt_key_created.abs_value))
+ {
+ /* this could rarely happen due to massive re-ordering of
+ * messages on the network level, but is most likely either
+ * a bug or some adversary messing with us. Report. */
+ GNUNET_break_op (0);
+ return;
+ }
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Decrypting key material.\n");
+#endif
+ if ((GNUNET_CRYPTO_rsa_decrypt
+ (my_private_key, &m->encrypted_key, &k,
+ sizeof (struct GNUNET_CRYPTO_AesSessionKey)) !=
+ sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
+ (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
+ {
+ /* failed to decrypt !? */
+ GNUNET_break_op (0);
+ return;
+ }
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# SET_KEY messages decrypted"), 1,
+ GNUNET_NO);
+ n->decrypt_key = k;
+ if (n->decrypt_key_created.abs_value != t.abs_value)
+ {
+ /* fresh key, reset sequence numbers */
+ n->last_sequence_number_received = 0;
+ n->last_packets_bitmap = 0;
+ n->decrypt_key_created = t;
+ }
+ update_neighbour_performance (n, ats, ats_count);
+ sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
+ switch (n->status)
+ {
+ case PEER_STATE_DOWN:
+ n->status = PEER_STATE_KEY_RECEIVED;
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Responding to `%s' with my own key.\n", "SET_KEY");
+#endif
+ send_key (n);
+ break;
+ case PEER_STATE_KEY_SENT:
+ case PEER_STATE_KEY_RECEIVED:
+ n->status = PEER_STATE_KEY_RECEIVED;
+ if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
+ (sender_status != PEER_STATE_KEY_CONFIRMED))
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Responding to `%s' with my own key (other peer has status %u).\n",
+ "SET_KEY", (unsigned int) sender_status);
+#endif
+ send_key (n);
+ }
+ break;
+ case PEER_STATE_KEY_CONFIRMED:
+ if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
+ (sender_status != PEER_STATE_KEY_CONFIRMED))
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
+ "SET_KEY", (unsigned int) sender_status);
+#endif
+ send_key (n);
+ }
+ break;
+ default:
+ GNUNET_break (0);
+ break;
+ }
+ if (n->pending_ping != NULL)
+ {
+ ping = n->pending_ping;
+ n->pending_ping = NULL;
+ handle_ping (n, ping, NULL, 0);
+ GNUNET_free (ping);
+ }
+ if (n->pending_pong != NULL)
+ {
+ pong = n->pending_pong;
+ n->pending_pong = NULL;
+ handle_pong (n, pong, NULL, 0);
+ GNUNET_free (pong);
+ }
+}
+
+
+
+/**
+ * PEERINFO is giving us a HELLO for a peer. Add the public key to
+ * the neighbour's struct and retry send_key. Or, if we did not get a
+ * HELLO, just do nothing.
+ *
+ * @param cls the 'struct Neighbour' to retry sending the key for
+ * @param peer the peer for which this is the HELLO
+ * @param hello HELLO message of that peer
+ * @param err_msg NULL if successful, otherwise contains error message
+ */
+static void
+process_hello_retry_send_key (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_HELLO_Message *hello,
+ const char *err_msg)
+{
+ struct Neighbour *n = cls;
+
+ if (err_msg != NULL)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ _("Error in communication with PEERINFO service\n"));
+ /* return; */
+ }
+
+ if (peer == NULL)
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Entered `%s' and `%s' is NULL!\n",
+ "process_hello_retry_send_key", "peer");
+#endif
+ n->pitr = NULL;
+ if (n->public_key != NULL)
+ {
+ if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
+ n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# SET_KEY messages deferred (need public key)"),
+ -1, GNUNET_NO);
+ send_key (n);
+ }
+ else
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# Delayed connecting due to lack of public key"),
+ 1, GNUNET_NO);
+ if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
+ n->retry_set_key_task =
+ GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
+ &set_key_retry_task, n);
+ }
+ return;
+ }
+
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Entered `%s' for peer `%4s'\n",
+ "process_hello_retry_send_key", GNUNET_i2s (peer));
+#endif
+ if (n->public_key != NULL)
+ {
+ /* already have public key, why are we here? */
+ GNUNET_break (0);
+ return;
+ }
+
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received new `%s' message for `%4s', initiating key exchange.\n",
+ "HELLO", GNUNET_i2s (peer));
+#endif
+ n->public_key =
+ GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
+ if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
+ {
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# Error extracting public key from HELLO"), 1,
+ GNUNET_NO);
+ GNUNET_free (n->public_key);
+ n->public_key = NULL;
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "GNUNET_HELLO_get_key returned awfully\n");
+#endif
+ return;
+ }
+}
+
+
+/**
+ * Send our key (and encrypted PING) to the other peer.
+ *
+ * @param n the other peer
+ */
+static void
+send_key (struct Neighbour *n)
+{
+ struct MessageEntry *pos;
+ struct SetKeyMessage *sm;
+ struct MessageEntry *me;
+ struct PingMessage pp;
+ struct PingMessage *pm;
+ struct GNUNET_CRYPTO_AesInitializationVector iv;
+
+ if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
+ n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (n->pitr != NULL)
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Key exchange in progress with `%4s'.\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ return; /* already in progress */
+ }
+ if (GNUNET_YES != n->is_connected)
+ {
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# Asking transport to connect (for SET_KEY)"),
+ 1, GNUNET_NO);
+ GNUNET_TRANSPORT_try_connect (transport, &n->peer);
+ return;
+ }
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Asked to perform key exchange with `%4s'.\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ if (n->public_key == NULL)
+ {
+ /* lookup n's public key, then try again */
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Lacking public key for `%4s', trying to obtain one (send_key).\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ GNUNET_assert (n->pitr == NULL);
+ n->pitr =
+ GNUNET_PEERINFO_iterate (peerinfo, &n->peer,
+ GNUNET_TIME_relative_multiply
+ (GNUNET_TIME_UNIT_SECONDS, 20),
+ &process_hello_retry_send_key, n);
+ return;
+ }
+ pos = n->encrypted_head;
+ while (pos != NULL)
+ {
+ if (GNUNET_YES == pos->is_setkey)
+ {
+ if (pos->sender_status == n->status)
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "`%s' message for `%4s' queued already\n", "SET_KEY",
+ GNUNET_i2s (&n->peer));
+#endif
+ goto trigger_processing;
+ }
+ GNUNET_CONTAINER_DLL_remove (n->encrypted_head, n->encrypted_tail, pos);
+ GNUNET_free (pos);
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Removing queued `%s' message for `%4s', will create a new one\n",
+ "SET_KEY", GNUNET_i2s (&n->peer));
+#endif
+ break;
+ }
+ pos = pos->next;
+ }
+
+ /* update status */
+ switch (n->status)
+ {
+ case PEER_STATE_DOWN:
+ n->status = PEER_STATE_KEY_SENT;
+ break;
+ case PEER_STATE_KEY_SENT:
+ break;
+ case PEER_STATE_KEY_RECEIVED:
+ break;
+ case PEER_STATE_KEY_CONFIRMED:
+ break;
+ default:
+ GNUNET_break (0);
+ break;
+ }
+
+
+ /* first, set key message */
+ me = GNUNET_malloc (sizeof (struct MessageEntry) +
+ sizeof (struct SetKeyMessage) +
+ sizeof (struct PingMessage));
+ me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
+ me->priority = SET_KEY_PRIORITY;
+ me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
+ me->is_setkey = GNUNET_YES;
+ me->got_slack = GNUNET_YES; /* do not defer this one! */
+ me->sender_status = n->status;
+ GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head, n->encrypted_tail,
+ n->encrypted_tail, me);
+ sm = (struct SetKeyMessage *) &me[1];
+ sm->header.size = htons (sizeof (struct SetKeyMessage));
+ sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
+ sm->sender_status =
+ htonl ((int32_t)
+ ((n->status ==
+ PEER_STATE_DOWN) ? PEER_STATE_KEY_SENT : n->status));
+ sm->purpose.size =
+ htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
+ sizeof (struct GNUNET_TIME_AbsoluteNBO) +
+ sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
+ sizeof (struct GNUNET_PeerIdentity));
+ sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
+ sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
+ sm->target = n->peer;
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
+ sizeof (struct
+ GNUNET_CRYPTO_AesSessionKey),
+ n->public_key, &sm->encrypted_key));
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
+ &sm->signature));
+ pm = (struct PingMessage *) &sm[1];
+ pm->header.size = htons (sizeof (struct PingMessage));
+ pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
+ pm->iv_seed =
+ GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
+ derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
+ pp.challenge = n->ping_challenge;
+ pp.target = n->peer;
+#if DEBUG_HANDSHAKE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
+ "SET_KEY", "PING", (unsigned int) n->ping_challenge,
+ GNUNET_i2s (&n->peer), (unsigned int) n->encrypt_key.crc32,
+ GNUNET_CRYPTO_crc32_n (&iv, sizeof (iv)), pm->iv_seed);
+#endif
+ do_encrypt (n, &iv, &pp.target, &pm->target,
+ sizeof (struct PingMessage) - ((void *) &pm->target -
+ (void *) pm));
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# SET_KEY and PING messages created"), 1,
+ GNUNET_NO);
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Have %llu ms left for `%s' transmission.\n",
+ (unsigned long long)
+ GNUNET_TIME_absolute_get_remaining (me->deadline).rel_value,
+ "SET_KEY");
+#endif
+trigger_processing:
+ /* trigger queue processing */
+ process_encrypted_neighbour_queue (n);
+ if ((n->status != PEER_STATE_KEY_CONFIRMED) &&
+ (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task))
+ n->retry_set_key_task =
+ GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
+ &set_key_retry_task, n);
+}
+
+
+/**
+ * We received a SET_KEY message. Validate and update
+ * our key material and status.
+ *
+ * @param n the neighbour from which we received message m
+ * @param m the set key message we received
+ * @param ats performance data
+ * @param ats_count number of entries in ats (excluding 0-termination)
+ */
+static void
+handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m,
+ const struct GNUNET_TRANSPORT_ATS_Information *ats,
+ uint32_t ats_count);
+
+
+
+/**
+ * PEERINFO is giving us a HELLO for a peer. Add the public key to
+ * the neighbour's struct and retry handling the set_key message. Or,
+ * if we did not get a HELLO, just free the set key message.
+ *
+ * @param cls pointer to the set key message
+ * @param peer the peer for which this is the HELLO
+ * @param hello HELLO message of that peer
+ * @param err_msg NULL if successful, otherwise contains error message
+ */
+static void
+process_hello_retry_handle_set_key (void *cls,
+ const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_HELLO_Message *hello,
+ const char *err_msg)
+{
+ struct Neighbour *n = cls;
+ struct SetKeyMessage *sm = n->skm;
+
+ if (err_msg != NULL)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ _("Error in communication with PEERINFO service\n"));
+ /* return; */
+ }
+
+ if (peer == NULL)
+ {
+ n->skm = NULL;
+ n->pitr = NULL;
+ if (n->public_key != NULL)
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received `%s' for `%4s', continuing processing of `%s' message.\n",
+ "HELLO", GNUNET_i2s (&n->peer), "SET_KEY");
+#endif
+ handle_set_key (n, sm, NULL, 0);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ _
+ ("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
+ "SET_KEY", GNUNET_i2s (&n->peer));
+ }
+ GNUNET_free (sm);
+ return;
+ }
+ if (n->public_key != NULL)
+ return; /* multiple HELLOs match!? */
+ n->public_key =
+ GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
+ if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
+ {
+ GNUNET_break_op (0);
+ GNUNET_free (n->public_key);
+ n->public_key = NULL;
+ }
+}
+
+
+
+/**
+ * Task that will retry "send_key" if our previous attempt failed
+ * to yield a PONG.
+ */
+static void
+set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Neighbour *n = cls;
+
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Retrying key transmission to `%4s'\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
+ n->set_key_retry_frequency =
+ GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
+ send_key (n);
+}
+
+
+struct GSC_KeyExchangeInfo *
+GSC_KX_start (const struct GNUNET_PeerIdentity *pid)
+{
+ struct GSC_KeyExchangeInfo *kx;
+
+ kx = NULL;
+ return kx;
+}
+
+
+void
+GSC_KX_stop (struct GSC_KeyExchangeInfo *kx)
+{
+ if (kx->pitr != NULL)
+ {
+ GNUNET_PEERINFO_iterate_cancel (kx->pitr);
+ kx->pitr = NULL;
+ }
+ if (kx->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (kx->retry_set_key_task);
+ GNUNET_free_non_null (kx->public_key);
+ GNUNET_free (kx);
+}
+
+
+int
+GSC_KX_init ()
+{
+ peerinfo = GNUNET_PEERINFO_connect (cfg);
+ if (NULL == peerinfo)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Could not access PEERINFO service. Exiting.\n"));
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+void
+GSC_KX_done ()
+{
+ if (peerinfo != NULL)
+ {
+ GNUNET_PEERINFO_disconnect (peerinfo);
+ peerinfo = NULL;
+ }
+
+}
--- /dev/null
+struct GSC_KeyExchangeInfo
+{
+
+ /**
+ * SetKeyMessage to transmit, NULL if we are not currently trying
+ * to send one.
+ */
+ struct SetKeyMessage *skm;
+
+ /**
+ * Non-NULL if we are currently looking up HELLOs for this peer.
+ * for this peer.
+ */
+ struct GNUNET_PEERINFO_IteratorContext *pitr;
+
+ /**
+ * Public key of the neighbour, NULL if we don't have it yet.
+ */
+ struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
+
+ /**
+ * We received a PING message before we got the "public_key"
+ * (or the SET_KEY). We keep it here until we have a key
+ * to decrypt it. NULL if no PING is pending.
+ */
+ struct PingMessage *pending_ping;
+
+ /**
+ * We received a PONG message before we got the "public_key"
+ * (or the SET_KEY). We keep it here until we have a key
+ * to decrypt it. NULL if no PONG is pending.
+ */
+ struct PongMessage *pending_pong;
+
+ /**
+ * Key we use to encrypt our messages for the other peer
+ * (initialized by us when we do the handshake).
+ */
+ struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
+
+ /**
+ * Key we use to decrypt messages from the other peer
+ * (given to us by the other peer during the handshake).
+ */
+ struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
+
+ /**
+ * At what time did we generate our encryption key?
+ */
+ struct GNUNET_TIME_Absolute encrypt_key_created;
+
+ /**
+ * At what time did the other peer generate the decryption key?
+ */
+ struct GNUNET_TIME_Absolute decrypt_key_created;
+
+ /**
+ * At what frequency are we currently re-trying SET_KEY messages?
+ */
+ struct GNUNET_TIME_Relative set_key_retry_frequency;
+
+ /**
+ * ID of task used for re-trying SET_KEY and PING message.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
+
+ /**
+ * What was our PING challenge number (for this peer)?
+ */
+ uint32_t ping_challenge;
+
+ /**
+ * What is our connection status?
+ */
+ enum PeerStateMachine status;
+
+};
--- /dev/null
+/*
+ This file is part of GNUnet.
+ (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file core/gnunet-service-core_neighbours.c
+ * @brief code for managing low-level 'plaintext' connections with transport (key exchange may or may not be done yet)
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_transport_service.h"
+#include "gnunet_service_core.h"
+#include "gnunet_service_core-neighbours.h"
+#include "gnunet_service_core-kx.h"
+
+
+/**
+ * Message ready for transmission via transport service. This struct
+ * is followed by the actual content of the message.
+ */
+struct MessageEntry
+{
+
+ /**
+ * We keep messages in a doubly linked list.
+ */
+ struct MessageEntry *next;
+
+ /**
+ * We keep messages in a doubly linked list.
+ */
+ struct MessageEntry *prev;
+
+ /**
+ * By when are we supposed to transmit this message?
+ */
+ struct GNUNET_TIME_Absolute deadline;
+
+ /**
+ * How long is the message? (number of bytes following the "struct
+ * MessageEntry", but not including the size of "struct
+ * MessageEntry" itself!)
+ */
+ size_t size;
+
+};
+
+
+/**
+ * Data kept per transport-connected peer.
+ */
+struct Neighbour
+{
+
+ /**
+ * Head of the batched message queue (already ordered, transmit
+ * starting with the head).
+ */
+ struct MessageEntry *message_head;
+
+ /**
+ * Tail of the batched message queue (already ordered, append new
+ * messages to tail).
+ */
+ struct MessageEntry *message_tail;
+
+ /**
+ * Handle for pending requests for transmission to this peer
+ * with the transport service. NULL if no request is pending.
+ */
+ struct GNUNET_TRANSPORT_TransmitHandle *th;
+
+ /**
+ * Information about the key exchange with the other peer.
+ */
+ struct GSC_KeyExchangeInfo *kxinfo;
+
+ /**
+ * Identity of the other peer.
+ */
+ struct GNUNET_PeerIdentity peer;
+
+ /**
+ * ID of task used for re-trying plaintext scheduling.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
+
+ /**
+ * Tracking bandwidth for sending to this peer.
+ */
+ struct GNUNET_BANDWIDTH_Tracker available_send_window;
+
+ /**
+ * Tracking bandwidth for sending to this peer.
+ */
+ struct GNUNET_BANDWIDTH_Tracker available_recv_window;
+
+
+};
+
+
+/**
+ * Map of peer identities to 'struct Neighbour'.
+ */
+static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
+
+/**
+ * Transport service.
+ */
+static struct GNUNET_TRANSPORT_Handle *transport;
+
+
+
+/**
+ * Find the entry for the given neighbour.
+ *
+ * @param peer identity of the neighbour
+ * @return NULL if we are not connected, otherwise the
+ * neighbour's entry.
+ */
+static struct Neighbour *
+find_neighbour (const struct GNUNET_PeerIdentity *peer)
+{
+ return GNUNET_CONTAINER_multihashmap_get (neighbours, &peer->hashPubKey);
+}
+
+
+/**
+ * Free the given entry for the neighbour.
+ *
+ * @param n neighbour to free
+ */
+static void
+free_neighbour (struct Neighbour *n)
+{
+ struct MessageEntry *m;
+
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Destroying neighbour entry for peer `%4s'\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ while (NULL != (m = n->message_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (n->message_head, n->message_tail, m);
+ GNUNET_free (m);
+ }
+ if (NULL != n->th)
+ {
+ GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
+ n->th = NULL;
+ }
+ if (NULL != n->kx)
+ {
+ GSC_KX_stop (n->kx);
+ n->kx = NULL;
+ }
+ if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
+ n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_remove (neighbours,
+ &n->peer.hashPubKey, n));
+ GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
+ GNUNET_CONTAINER_multihashmap_size (neighbours),
+ GNUNET_NO);
+ GNUNET_free (n);
+}
+
+
+/**
+ * Check if we have encrypted messages for the specified neighbour
+ * pending, and if so, check with the transport about sending them
+ * out.
+ *
+ * @param n neighbour to check.
+ */
+static void
+process_queue (struct Neighbour *n);
+
+
+/**
+ * Function called when the transport service is ready to receive a
+ * message for the respective peer
+ *
+ * @param cls neighbour to use message from
+ * @param size number of bytes we can transmit
+ * @param buf where to copy the message
+ * @return number of bytes transmitted
+ */
+static size_t
+transmit_ready (void *cls, size_t size, void *buf)
+{
+ struct Neighbour *n = cls;
+ struct MessageEntry *m;
+ size_t ret;
+ char *cbuf;
+
+ n->th = NULL;
+ m = n->message_head;
+ if (m == NULL)
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ return 0;
+ }
+ GNUNET_CONTAINER_DLL_remove (n->encrypted_head, n->encrypted_tail, m);
+ if (buf == NULL)
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmission of message of type %u and size %u failed\n",
+ (unsigned int)
+ ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
+ (unsigned int) m->size);
+#endif
+ GNUNET_free (m);
+ process_queue (n);
+ return 0;
+ }
+ ret = 0;
+ cbuf = buf;
+ GNUNET_assert (size >= m->size);
+ memcpy (cbuf, &m[1], m->size);
+ ret = m->size;
+ GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window, m->size);
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Copied message of type %u and size %u into transport buffer for `%4s'\n",
+ (unsigned int)
+ ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
+ (unsigned int) ret, GNUNET_i2s (&n->peer));
+#endif
+ GNUNET_free (m);
+ process_queue (n);
+ GNUNET_STATISTICS_update (GSC_stats,
+ gettext_noop
+ ("# encrypted bytes given to transport"), ret,
+ GNUNET_NO);
+ return ret;
+}
+
+
+/**
+ * Check if we have messages for the specified neighbour pending, and
+ * if so, check with the transport about sending them out.
+ *
+ * @param n neighbour to check.
+ */
+static void
+process_queue (struct Neighbour *n)
+{
+ struct MessageEntry *m;
+
+ if (n->th != NULL)
+ return; /* request already pending */
+ m = n->message_head;
+ if (m == NULL)
+ return;
+#if DEBUG_CORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
+ (unsigned int) m->size, GNUNET_i2s (&n->peer),
+ (unsigned long long)
+ GNUNET_TIME_absolute_get_remaining (m->deadline).rel_value);
+#endif
+ n->th =
+ GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer, m->size,
+ m->priority,
+ GNUNET_TIME_absolute_get_remaining
+ (m->deadline),
+ &transmit_ready,
+ n);
+ if (n->th != NULL)
+ return;
+ /* message request too large or duplicate request */
+ GNUNET_break (0);
+ /* discard encrypted message */
+ GNUNET_CONTAINER_DLL_remove (n->encrypted_head, n->encrypted_tail, m);
+ GNUNET_free (m);
+ process_queue (n);
+}
+
+
+
+/**
+ * Function called by transport to notify us that
+ * a peer connected to us (on the network level).
+ *
+ * @param cls closure
+ * @param peer the peer that connected
+ * @param ats performance data
+ * @param ats_count number of entries in ats (excluding 0-termination)
+ */
+static void
+handle_transport_notify_connect (void *cls,
+ const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_TRANSPORT_ATS_Information
+ *ats, uint32_t ats_count)
+{
+ struct Neighbour *n;
+
+ if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
+ {
+ GNUNET_break (0);
+ return;
+ }
+ n = find_neighbour (peer);
+ if (n != NULL)
+ {
+ /* duplicate connect notification!? */
+ GNUNET_break (0);
+ return;
+ }
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received connection from `%4s'.\n",
+ GNUNET_i2s (peer));
+#endif
+ n = GNUNET_malloc (sizeof (struct Neighbour));
+ n->peer = *pid;
+ GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
+ GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
+ MAX_WINDOW_TIME_S);
+ GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
+ GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
+ MAX_WINDOW_TIME_S);
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_put (neighbours,
+ &n->peer.hashPubKey, n,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
+ GNUNET_CONTAINER_multihashmap_size (neighbours),
+ GNUNET_NO);
+ GNUNET_TRANSPORT_set_quota (transport, peer,
+ GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
+ GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT);
+ n->kx = GSC_KX_start (pid);
+}
+
+
+/**
+ * Function called by transport telling us that a peer
+ * disconnected.
+ *
+ * @param cls closure
+ * @param peer the peer that disconnected
+ */
+static void
+handle_transport_notify_disconnect (void *cls,
+ const struct GNUNET_PeerIdentity *peer)
+{
+ struct Neighbour *n;
+
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Peer `%4s' disconnected from us; received notification from transport.\n",
+ GNUNET_i2s (peer));
+#endif
+ n = find_neighbour (peer);
+ if (n == NULL)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ free_neighbour (n);
+}
+
+
+/**
+ * Function called by the transport for each received message.
+ *
+ * @param cls closure
+ * @param peer (claimed) identity of the other peer
+ * @param message the message
+ * @param ats performance data
+ * @param ats_count number of entries in ats (excluding 0-termination)
+ */
+static void
+handle_transport_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message,
+ const struct GNUNET_TRANSPORT_ATS_Information *ats,
+ uint32_t ats_count)
+{
+ struct Neighbour *n;
+ struct GNUNET_TIME_Absolute now;
+ int up;
+ uint16_t type;
+ uint16_t size;
+ int changed;
+
+#if DEBUG_CORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received message of type %u from `%4s', demultiplexing.\n",
+ (unsigned int) ntohs (message->type), GNUNET_i2s (peer));
+#endif
+ if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
+ {
+ GNUNET_break (0);
+ return;
+ }
+ n = find_neighbour (peer);
+ if (n == NULL)
+ {
+ /* received message from peer that is not connected!? */
+ GNUNET_break (0);
+ return;
+ }
+
+
+ changed = GNUNET_NO;
+ up = (n->status == PEER_STATE_KEY_CONFIRMED);
+ type = ntohs (message->type);
+ size = ntohs (message->size);
+ switch (type)
+ {
+ case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
+ if (size != sizeof (struct SetKeyMessage))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ GNUNET_STATISTICS_update (stats, gettext_noop ("# session keys received"),
+ 1, GNUNET_NO);
+ handle_set_key (n, (const struct SetKeyMessage *) message, ats, ats_count);
+ break;
+ case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
+ if (size <
+ sizeof (struct EncryptedMessage) + sizeof (struct GNUNET_MessageHeader))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ if ((n->status != PEER_STATE_KEY_RECEIVED) &&
+ (n->status != PEER_STATE_KEY_CONFIRMED))
+ {
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# failed to decrypt message (no session key)"),
+ 1, GNUNET_NO);
+ send_key (n);
+ return;
+ }
+ handle_encrypted_message (n, (const struct EncryptedMessage *) message, ats,
+ ats_count);
+ break;
+ case GNUNET_MESSAGE_TYPE_CORE_PING:
+ if (size != sizeof (struct PingMessage))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"),
+ 1, GNUNET_NO);
+ if ((n->status != PEER_STATE_KEY_RECEIVED) &&
+ (n->status != PEER_STATE_KEY_CONFIRMED))
+ {
+#if DEBUG_CORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
+ "PING", GNUNET_i2s (&n->peer));
+#endif
+ GNUNET_free_non_null (n->pending_ping);
+ n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
+ memcpy (n->pending_ping, message, sizeof (struct PingMessage));
+ return;
+ }
+ handle_ping (n, (const struct PingMessage *) message, ats, ats_count);
+ break;
+ case GNUNET_MESSAGE_TYPE_CORE_PONG:
+ if (size != sizeof (struct PongMessage))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"),
+ 1, GNUNET_NO);
+ if ((n->status != PEER_STATE_KEY_RECEIVED) &&
+ (n->status != PEER_STATE_KEY_CONFIRMED))
+ {
+#if DEBUG_CORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
+ "PONG", GNUNET_i2s (&n->peer));
+#endif
+ GNUNET_free_non_null (n->pending_pong);
+ n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
+ memcpy (n->pending_pong, message, sizeof (struct PongMessage));
+ return;
+ }
+ handle_pong (n, (const struct PongMessage *) message, ats, ats_count);
+ break;
+ default:
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Unsupported message of type %u received.\n"),
+ (unsigned int) type);
+ return;
+ }
+ if (n->status == PEER_STATE_KEY_CONFIRMED)
+ {
+ now = GNUNET_TIME_absolute_get ();
+ n->last_activity = now;
+ changed = GNUNET_YES;
+ if (!up)
+ {
+ GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"),
+ 1, GNUNET_NO);
+ n->time_established = now;
+ }
+ if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (n->keep_alive_task);
+ n->keep_alive_task =
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide
+ (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
+ 2), &send_keep_alive, n);
+ }
+ if (changed)
+ handle_peer_status_change (n);
+}
+
+
+/**
+ * Transmit the given message to the given target.
+ *
+ * @param target peer that should receive the message (must be connected)
+ * @param msg message to transmit
+ * @param timeout by when should the transmission be done?
+ */
+void
+GDS_NEIGHBOURS_transmit (const struct GNUNET_PeerIdentity *target,
+ const struct GNUNET_MessageHeader *msg,
+ struct GNUNET_TIME_Relative timeout)
+{
+
+}
+
+
+/**
+ * Initialize neighbours subsystem.
+ */
+int
+GSC_NEIGHBOURS_init ()
+{
+ neighbours = GNUNET_CONTAINER_multihashmap_create (128);
+ transport =
+ GNUNET_TRANSPORT_connect (GSC_cfg,
+ &GSC_my_identity, NULL,
+ &handle_transport_receive,
+ &handle_transport_notify_connect,
+ &handle_transport_notify_disconnect);
+ if (NULL == transport)
+ {
+ GNUNET_CONTAINER_multihashmap_destroy (neighbours);
+ neighbours = NULL;
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Wrapper around 'free_neighbour'.
+ *
+ * @param cls unused
+ * @param key peer identity
+ * @param value the 'struct Neighbour' to free
+ * @return GNUNET_OK (continue to iterate)
+ */
+static int
+free_neighbour_helper (void *cls, const GNUNET_HashCode * key, void *value)
+{
+ struct Neighbour *n = value;
+
+ free_neighbour (n);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Shutdown neighbours subsystem.
+ */
+void
+GSC_NEIGHBOURS_done ()
+{
+ if (NULL == transport)
+ return;
+ GNUNET_CONTAINER_multihashmap_iterate (neighbours, &free_neighbour_helper,
+ NULL);
+ GNUNET_TRANSPORT_disconnect (transport);
+ transport = NULL;
+ GNUNET_CONTAINER_multihashmap_destroy (neighbours);
+ neighbours = NULL;
+}
+
+/* end of gnunet-service-core_neighbours.c */
+
--- /dev/null
+
+
+
+/**
+ * Select messages for transmission. This heuristic uses a combination
+ * of earliest deadline first (EDF) scheduling (with bounded horizon)
+ * and priority-based discard (in case no feasible schedule exist) and
+ * speculative optimization (defer any kind of transmission until
+ * we either create a batch of significant size, 25% of max, or until
+ * we are close to a deadline). Furthermore, when scheduling the
+ * heuristic also packs as many messages into the batch as possible,
+ * starting with those with the earliest deadline. Yes, this is fun.
+ *
+ * @param n neighbour to select messages from
+ * @param size number of bytes to select for transmission
+ * @param retry_time set to the time when we should try again
+ * (only valid if this function returns zero)
+ * @return number of bytes selected, or 0 if we decided to
+ * defer scheduling overall; in that case, retry_time is set.
+ */
+static size_t
+select_messages (struct Neighbour *n, size_t size,
+ struct GNUNET_TIME_Relative *retry_time)
+{
+ struct MessageEntry *pos;
+ struct MessageEntry *min;
+ struct MessageEntry *last;
+ unsigned int min_prio;
+ struct GNUNET_TIME_Absolute t;
+ struct GNUNET_TIME_Absolute now;
+ struct GNUNET_TIME_Relative delta;
+ uint64_t avail;
+ struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
+ size_t off;
+ uint64_t tsize;
+ unsigned int queue_size;
+ int discard_low_prio;
+
+ GNUNET_assert (NULL != n->messages);
+ now = GNUNET_TIME_absolute_get ();
+ /* last entry in linked list of messages processed */
+ last = NULL;
+ /* should we remove the entry with the lowest
+ * priority from consideration for scheduling at the
+ * end of the loop? */
+ queue_size = 0;
+ tsize = 0;
+ pos = n->messages;
+ while (pos != NULL)
+ {
+ queue_size++;
+ tsize += pos->size;
+ pos = pos->next;
+ }
+ discard_low_prio = GNUNET_YES;
+ while (GNUNET_YES == discard_low_prio)
+ {
+ min = NULL;
+ min_prio = UINT_MAX;
+ discard_low_prio = GNUNET_NO;
+ /* calculate number of bytes available for transmission at time "t" */
+ avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
+ t = now;
+ /* how many bytes have we (hypothetically) scheduled so far */
+ off = 0;
+ /* maximum time we can wait before transmitting anything
+ * and still make all of our deadlines */
+ slack = GNUNET_TIME_UNIT_FOREVER_REL;
+ pos = n->messages;
+ /* note that we use "*2" here because we want to look
+ * a bit further into the future; much more makes no
+ * sense since new message might be scheduled in the
+ * meantime... */
+ while ((pos != NULL) && (off < size * 2))
+ {
+ if (pos->do_transmit == GNUNET_YES)
+ {
+ /* already removed from consideration */
+ pos = pos->next;
+ continue;
+ }
+ if (discard_low_prio == GNUNET_NO)
+ {
+ delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
+ if (delta.rel_value > 0)
+ {
+ // FIXME: HUH? Check!
+ t = pos->deadline;
+ avail +=
+ GNUNET_BANDWIDTH_value_get_available_until (n->bw_out, delta);
+ }
+ if (avail < pos->size)
+ {
+ // FIXME: HUH? Check!
+ discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
+ }
+ else
+ {
+ avail -= pos->size;
+ /* update slack, considering both its absolute deadline
+ * and relative deadlines caused by other messages
+ * with their respective load */
+ slack =
+ GNUNET_TIME_relative_min (slack,
+ GNUNET_BANDWIDTH_value_get_delay_for
+ (n->bw_out, avail));
+ if (pos->deadline.abs_value <= now.abs_value)
+ {
+ /* now or never */
+ slack = GNUNET_TIME_UNIT_ZERO;
+ }
+ else if (GNUNET_YES == pos->got_slack)
+ {
+ /* should be soon now! */
+ slack =
+ GNUNET_TIME_relative_min (slack,
+ GNUNET_TIME_absolute_get_remaining
+ (pos->slack_deadline));
+ }
+ else
+ {
+ slack =
+ GNUNET_TIME_relative_min (slack,
+ GNUNET_TIME_absolute_get_difference
+ (now, pos->deadline));
+ pos->got_slack = GNUNET_YES;
+ pos->slack_deadline =
+ GNUNET_TIME_absolute_min (pos->deadline,
+ GNUNET_TIME_relative_to_absolute
+ (GNUNET_CONSTANTS_MAX_CORK_DELAY));
+ }
+ }
+ }
+ off += pos->size;
+ t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
+ if (pos->priority <= min_prio)
+ {
+ /* update min for discard */
+ min_prio = pos->priority;
+ min = pos;
+ }
+ pos = pos->next;
+ }
+ if (discard_low_prio)
+ {
+ GNUNET_assert (min != NULL);
+ /* remove lowest-priority entry from consideration */
+ min->do_transmit = GNUNET_YES; /* means: discard (for now) */
+ }
+ last = pos;
+ }
+ /* guard against sending "tiny" messages with large headers without
+ * urgent deadlines */
+ if ((slack.rel_value > GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value) &&
+ (size > 4 * off) && (queue_size <= MAX_PEER_QUEUE_SIZE - 2))
+ {
+ /* less than 25% of message would be filled with deadlines still
+ * being met if we delay by one second or more; so just wait for
+ * more data; but do not wait longer than 1s (since we don't want
+ * to delay messages for a really long time either). */
+ *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
+ /* reset do_transmit values for next time */
+ while (pos != last)
+ {
+ pos->do_transmit = GNUNET_NO;
+ pos = pos->next;
+ }
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# transmissions delayed due to corking"), 1,
+ GNUNET_NO);
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
+ (unsigned long long) retry_time->rel_value, (unsigned int) off,
+ (unsigned int) size);
+#endif
+ return 0;
+ }
+ /* select marked messages (up to size) for transmission */
+ off = 0;
+ pos = n->messages;
+ while (pos != last)
+ {
+ if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
+ {
+ pos->do_transmit = GNUNET_YES; /* mark for transmission */
+ off += pos->size;
+ size -= pos->size;
+#if DEBUG_CORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Selecting message of size %u for transmission\n",
+ (unsigned int) pos->size);
+#endif
+ }
+ else
+ {
+#if DEBUG_CORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
+ (unsigned int) pos->size, size);
+#endif
+ pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
+ }
+ pos = pos->next;
+ }
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
+ (unsigned long long) off, (unsigned long long) tsize, queue_size,
+ (unsigned int) MAX_PEER_QUEUE_SIZE, GNUNET_i2s (&n->peer));
+#endif
+ return off;
+}
+
+
+/**
+ * Batch multiple messages into a larger buffer.
+ *
+ * @param n neighbour to take messages from
+ * @param buf target buffer
+ * @param size size of buf
+ * @param deadline set to transmission deadline for the result
+ * @param retry_time set to the time when we should try again
+ * (only valid if this function returns zero)
+ * @param priority set to the priority of the batch
+ * @return number of bytes written to buf (can be zero)
+ */
+static size_t
+batch_message (struct Neighbour *n, char *buf, size_t size,
+ struct GNUNET_TIME_Absolute *deadline,
+ struct GNUNET_TIME_Relative *retry_time, unsigned int *priority)
+{
+ char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
+ struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage *) ntmb;
+ struct MessageEntry *pos;
+ struct MessageEntry *prev;
+ struct MessageEntry *next;
+ size_t ret;
+
+ ret = 0;
+ *priority = 0;
+ *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
+ *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
+ if (0 == select_messages (n, size, retry_time))
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "No messages selected, will try again in %llu ms\n",
+ retry_time->rel_value);
+#endif
+ return 0;
+ }
+ ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
+ ntm->ats_count = htonl (0);
+ ntm->ats.type = htonl (0);
+ ntm->ats.value = htonl (0);
+ ntm->peer = n->peer;
+ pos = n->messages;
+ prev = NULL;
+ while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
+ {
+ next = pos->next;
+ if (GNUNET_YES == pos->do_transmit)
+ {
+ GNUNET_assert (pos->size <= size);
+ /* do notifications */
+ /* FIXME: track if we have *any* client that wants
+ * full notifications and only do this if that is
+ * actually true */
+ if (pos->size <
+ GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
+ {
+ memcpy (&ntm[1], &pos[1], pos->size);
+ ntm->header.size =
+ htons (sizeof (struct NotifyTrafficMessage) +
+ sizeof (struct GNUNET_MessageHeader));
+ send_to_all_clients (&ntm->header, GNUNET_YES,
+ GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
+ }
+ else
+ {
+ /* message too large for 'full' notifications, we do at
+ * least the 'hdr' type */
+ memcpy (&ntm[1], &pos[1], sizeof (struct GNUNET_MessageHeader));
+ }
+ ntm->header.size =
+ htons (sizeof (struct NotifyTrafficMessage) + pos->size);
+ send_to_all_clients (&ntm->header, GNUNET_YES,
+ GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
+#if DEBUG_HANDSHAKE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Encrypting %u bytes with message of type %u and size %u\n",
+ pos->size,
+ (unsigned int)
+ ntohs (((const struct GNUNET_MessageHeader *) &pos[1])->type),
+ (unsigned int)
+ ntohs (((const struct GNUNET_MessageHeader *)
+ &pos[1])->size));
+#endif
+ /* copy for encrypted transmission */
+ memcpy (&buf[ret], &pos[1], pos->size);
+ ret += pos->size;
+ size -= pos->size;
+ *priority += pos->priority;
+#if DEBUG_CORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Adding plaintext message of size %u with deadline %llu ms to batch\n",
+ (unsigned int) pos->size,
+ (unsigned long long)
+ GNUNET_TIME_absolute_get_remaining (pos->deadline).rel_value);
+#endif
+ deadline->abs_value =
+ GNUNET_MIN (deadline->abs_value, pos->deadline.abs_value);
+ GNUNET_free (pos);
+ if (prev == NULL)
+ n->messages = next;
+ else
+ prev->next = next;
+ }
+ else
+ {
+ prev = pos;
+ }
+ pos = next;
+ }
+#if DEBUG_CORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Deadline for message batch is %llu ms\n",
+ GNUNET_TIME_absolute_get_remaining (*deadline).rel_value);
+#endif
+ return ret;
+}
+
+
+/**
+ * Remove messages with deadlines that have long expired from
+ * the queue.
+ *
+ * @param n neighbour to inspect
+ */
+static void
+discard_expired_messages (struct Neighbour *n)
+{
+ struct MessageEntry *prev;
+ struct MessageEntry *next;
+ struct MessageEntry *pos;
+ struct GNUNET_TIME_Absolute now;
+ struct GNUNET_TIME_Relative delta;
+ int disc;
+ unsigned int queue_length;
+
+ disc = GNUNET_NO;
+ now = GNUNET_TIME_absolute_get ();
+ prev = NULL;
+ queue_length = 0;
+ pos = n->messages;
+ while (pos != NULL)
+ {
+ queue_length++;
+ next = pos->next;
+ delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
+ if (delta.rel_value > PAST_EXPIRATION_DISCARD_TIME.rel_value)
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Message is %llu ms past due, discarding.\n",
+ delta.rel_value);
+#endif
+ if (prev == NULL)
+ n->messages = next;
+ else
+ prev->next = next;
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# messages discarded (expired prior to transmission)"),
+ 1, GNUNET_NO);
+ disc = GNUNET_YES;
+ GNUNET_free (pos);
+ }
+ else
+ prev = pos;
+ pos = next;
+ }
+ if ( (GNUNET_YES == disc) &&
+ (queue_length == MAX_PEER_QUEUE_SIZE) )
+ schedule_peer_messages (n);
+}
+
+
+/**
+ * Signature of the main function of a task.
+ *
+ * @param cls closure
+ * @param tc context information (why was this task triggered now)
+ */
+static void
+retry_plaintext_processing (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Neighbour *n = cls;
+
+ n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
+ process_plaintext_neighbour_queue (n);
+}
+
+
+/**
+ * Check if we have plaintext messages for the specified neighbour
+ * pending, and if so, consider batching and encrypting them (and
+ * then trigger processing of the encrypted queue if needed).
+ *
+ * @param n neighbour to check.
+ */
+static void
+process_plaintext_neighbour_queue (struct Neighbour *n)
+{
+ char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
+ size_t used;
+ struct EncryptedMessage *em; /* encrypted message */
+ struct EncryptedMessage *ph; /* plaintext header */
+ struct MessageEntry *me;
+ unsigned int priority;
+ struct GNUNET_TIME_Absolute deadline;
+ struct GNUNET_TIME_Relative retry_time;
+ struct GNUNET_CRYPTO_AesInitializationVector iv;
+ struct GNUNET_CRYPTO_AuthKey auth_key;
+
+ if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
+ n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ switch (n->status)
+ {
+ case PEER_STATE_DOWN:
+ send_key (n);
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ return;
+ case PEER_STATE_KEY_SENT:
+ if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
+ n->retry_set_key_task =
+ GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
+ &set_key_retry_task, n);
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ return;
+ case PEER_STATE_KEY_RECEIVED:
+ if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
+ n->retry_set_key_task =
+ GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
+ &set_key_retry_task, n);
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ return;
+ case PEER_STATE_KEY_CONFIRMED:
+ /* ready to continue */
+ break;
+ }
+ discard_expired_messages (n);
+ if (n->messages == NULL)
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Plaintext message queue for `%4s' is empty.\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ return; /* no pending messages */
+ }
+ if (n->encrypted_head != NULL)
+ {
+#if DEBUG_CORE > 2
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ return; /* wait for messages already encrypted to be
+ * processed first! */
+ }
+ ph = (struct EncryptedMessage *) pbuf;
+ deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
+ priority = 0;
+ used = sizeof (struct EncryptedMessage);
+ used +=
+ batch_message (n, &pbuf[used],
+ GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE, &deadline,
+ &retry_time, &priority);
+ if (used == sizeof (struct EncryptedMessage))
+ {
+#if DEBUG_CORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "No messages selected for transmission to `%4s' at this time, will try again later.\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ /* no messages selected for sending, try again later... */
+ n->retry_plaintext_task =
+ GNUNET_SCHEDULER_add_delayed (retry_time, &retry_plaintext_processing,
+ n);
+ return;
+ }
+#if DEBUG_CORE_QUOTA
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending %u b/s as new limit to peer `%4s'\n",
+ (unsigned int) ntohl (n->bw_in.value__), GNUNET_i2s (&n->peer));
+#endif
+ ph->iv_seed =
+ htonl (GNUNET_CRYPTO_random_u32
+ (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
+ ph->sequence_number = htonl (++n->last_sequence_number_sent);
+ ph->inbound_bw_limit = n->bw_in;
+ ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
+
+ /* setup encryption message header */
+ me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
+ me->deadline = deadline;
+ me->priority = priority;
+ me->size = used;
+ em = (struct EncryptedMessage *) &me[1];
+ em->header.size = htons (used);
+ em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
+ em->iv_seed = ph->iv_seed;
+ derive_iv (&iv, &n->encrypt_key, ph->iv_seed, &n->peer);
+ /* encrypt */
+#if DEBUG_HANDSHAKE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
+ (unsigned int) used - ENCRYPTED_HEADER_SIZE,
+ GNUNET_i2s (&n->peer),
+ (unsigned long long)
+ GNUNET_TIME_absolute_get_remaining (deadline).rel_value);
+#endif
+ GNUNET_assert (GNUNET_OK ==
+ do_encrypt (n, &iv, &ph->sequence_number, &em->sequence_number,
+ used - ENCRYPTED_HEADER_SIZE));
+ derive_auth_key (&auth_key, &n->encrypt_key, ph->iv_seed,
+ n->encrypt_key_created);
+ GNUNET_CRYPTO_hmac (&auth_key, &em->sequence_number,
+ used - ENCRYPTED_HEADER_SIZE, &em->hmac);
+#if DEBUG_HANDSHAKE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Authenticated %u bytes of ciphertext %u: `%s'\n",
+ used - ENCRYPTED_HEADER_SIZE,
+ GNUNET_CRYPTO_crc32_n (&em->sequence_number,
+ used - ENCRYPTED_HEADER_SIZE),
+ GNUNET_h2s (&em->hmac));
+#endif
+ /* append to transmission list */
+ GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head, n->encrypted_tail,
+ n->encrypted_tail, me);
+ process_encrypted_neighbour_queue (n);
+ schedule_peer_messages (n);
+}
+
--- /dev/null
+/* code for managing of 'encrypted' sessions (key exchange done) */
+
+
+/**
+ * Record kept for each request for transmission issued by a
+ * client that is still pending.
+ */
+struct ClientActiveRequest;
+
+/**
+ * Data kept per session.
+ */
+struct Session
+{
+ /**
+ * Identity of the other peer.
+ */
+ struct GNUNET_PeerIdentity peer;
+
+ /**
+ * Head of list of requests from clients for transmission to
+ * this peer.
+ */
+ struct ClientActiveRequest *active_client_request_head;
+
+ /**
+ * Tail of list of requests from clients for transmission to
+ * this peer.
+ */
+ struct ClientActiveRequest *active_client_request_tail;
+
+ /**
+ * Performance data for the peer.
+ */
+ struct GNUNET_TRANSPORT_ATS_Information *ats;
+
+ /**
+ * Information about the key exchange with the other peer.
+ */
+ struct GSC_KeyExchangeInfo *kxinfo;
+
+ /**
+ * ID of task used for sending keep-alive pings.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier keep_alive_task;
+
+ /**
+ * ID of task used for cleaning up dead neighbour entries.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier dead_clean_task;
+
+ /**
+ * ID of task used for updating bandwidth quota for this neighbour.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier quota_update_task;
+
+ /**
+ * At what time did we initially establish (as in, complete session
+ * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
+ */
+ struct GNUNET_TIME_Absolute time_established;
+
+ /**
+ * At what time did we last receive an encrypted message from the
+ * other peer? Should be zero if status != KEY_CONFIRMED.
+ */
+ struct GNUNET_TIME_Absolute last_activity;
+
+ /**
+ * Tracking bandwidth for sending to this peer.
+ */
+ struct GNUNET_BANDWIDTH_Tracker available_send_window;
+
+ /**
+ * Tracking bandwidth for receiving from this peer.
+ */
+ struct GNUNET_BANDWIDTH_Tracker available_recv_window;
+
+ /**
+ * How valueable were the messages of this peer recently?
+ */
+ unsigned long long current_preference;
+
+ /**
+ * Number of entries in 'ats'.
+ */
+ unsigned int ats_count;
+
+ /**
+ * Bit map indicating which of the 32 sequence numbers before the last
+ * were received (good for accepting out-of-order packets and
+ * estimating reliability of the connection)
+ */
+ unsigned int last_packets_bitmap;
+
+ /**
+ * last sequence number received on this connection (highest)
+ */
+ uint32_t last_sequence_number_received;
+
+ /**
+ * last sequence number transmitted
+ */
+ uint32_t last_sequence_number_sent;
+
+ /**
+ * Available bandwidth in for this peer (current target).
+ */
+ struct GNUNET_BANDWIDTH_Value32NBO bw_in;
+
+ /**
+ * Available bandwidth out for this peer (current target).
+ */
+ struct GNUNET_BANDWIDTH_Value32NBO bw_out;
+
+ /**
+ * Internal bandwidth limit set for this peer (initially typically
+ * set to "-1"). Actual "bw_out" is MIN of
+ * "bpm_out_internal_limit" and "bw_out_external_limit".
+ */
+ struct GNUNET_BANDWIDTH_Value32NBO bw_out_internal_limit;
+
+ /**
+ * External bandwidth limit set for this peer by the
+ * peer that we are communicating with. "bw_out" is MIN of
+ * "bw_out_internal_limit" and "bw_out_external_limit".
+ */
+ struct GNUNET_BANDWIDTH_Value32NBO bw_out_external_limit;
+
+};
+
+
+/**
+ * Map of peer identities to 'struct Session'.
+ */
+static struct GNUNET_CONTAINER_MultiHashMap *sessions;
+
+
+/**
+ * Session entry for "this" peer.
+ */
+static struct Session self;
+
+/**
+ * Sum of all preferences among all neighbours.
+ */
+static unsigned long long preference_sum;
+
+
+// FIXME.........
+
+/**
+ * At what time should the connection to the given neighbour
+ * time out (given no further activity?)
+ *
+ * @param n neighbour in question
+ * @return absolute timeout
+ */
+static struct GNUNET_TIME_Absolute
+get_neighbour_timeout (struct Neighbour *n)
+{
+ return GNUNET_TIME_absolute_add (n->last_activity,
+ GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
+}
+
+
+/**
+ * Helper function for update_preference_sum.
+ */
+static int
+update_preference (void *cls, const GNUNET_HashCode * key, void *value)
+{
+ unsigned long long *ps = cls;
+ struct Neighbour *n = value;
+
+ n->current_preference /= 2;
+ *ps += n->current_preference;
+ return GNUNET_OK;
+}
+
+
+/**
+ * A preference value for a neighbour was update. Update
+ * the preference sum accordingly.
+ *
+ * @param inc how much was a preference value increased?
+ */
+static void
+update_preference_sum (unsigned long long inc)
+{
+ unsigned long long os;
+
+ os = preference_sum;
+ preference_sum += inc;
+ if (preference_sum >= os)
+ return; /* done! */
+ /* overflow! compensate by cutting all values in half! */
+ preference_sum = 0;
+ GNUNET_CONTAINER_multihashmap_iterate (neighbours, &update_preference,
+ &preference_sum);
+ GNUNET_STATISTICS_set (stats, gettext_noop ("# total peer preference"),
+ preference_sum, GNUNET_NO);
+}
+
+
+/**
+ * Find the entry for the given neighbour.
+ *
+ * @param peer identity of the neighbour
+ * @return NULL if we are not connected, otherwise the
+ * neighbour's entry.
+ */
+static struct Neighbour *
+find_neighbour (const struct GNUNET_PeerIdentity *peer)
+{
+ return GNUNET_CONTAINER_multihashmap_get (neighbours, &peer->hashPubKey);
+}
+
+
+/**
+ * Function called by transport telling us that a peer
+ * changed status.
+ *
+ * @param n the peer that changed status
+ */
+static void
+handle_peer_status_change (struct Neighbour *n)
+{
+ struct PeerStatusNotifyMessage *psnm;
+ char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
+ struct GNUNET_TRANSPORT_ATS_Information *ats;
+ size_t size;
+
+ if ((!n->is_connected) || (n->status != PEER_STATE_KEY_CONFIRMED))
+ return;
+#if DEBUG_CORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Peer `%4s' changed status\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ size =
+ sizeof (struct PeerStatusNotifyMessage) +
+ n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
+ if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ /* recovery strategy: throw away performance data */
+ GNUNET_array_grow (n->ats, n->ats_count, 0);
+ size =
+ sizeof (struct PeerStatusNotifyMessage) +
+ n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
+ }
+ psnm = (struct PeerStatusNotifyMessage *) buf;
+ psnm->header.size = htons (size);
+ psnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE);
+ psnm->timeout = GNUNET_TIME_absolute_hton (get_neighbour_timeout (n));
+ psnm->bandwidth_in = n->bw_in;
+ psnm->bandwidth_out = n->bw_out;
+ psnm->peer = n->peer;
+ psnm->ats_count = htonl (n->ats_count);
+ ats = &psnm->ats;
+ memcpy (ats, n->ats,
+ n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
+ ats[n->ats_count].type = htonl (0);
+ ats[n->ats_count].value = htonl (0);
+ send_to_all_clients (&psnm->header, GNUNET_YES,
+ GNUNET_CORE_OPTION_SEND_STATUS_CHANGE);
+ GNUNET_STATISTICS_update (stats, gettext_noop ("# peer status changes"), 1,
+ GNUNET_NO);
+}
+
+
+
+/**
+ * Go over our message queue and if it is not too long, go
+ * over the pending requests from clients for this
+ * neighbour and send some clients a 'READY' notification.
+ *
+ * @param n which peer to process
+ */
+static void
+schedule_peer_messages (struct Neighbour *n)
+{
+ struct SendMessageReady smr;
+ struct ClientActiveRequest *car;
+ struct ClientActiveRequest *pos;
+ struct Client *c;
+ struct MessageEntry *mqe;
+ unsigned int queue_size;
+
+ /* check if neighbour queue is empty enough! */
+ if (n != &self)
+ {
+ queue_size = 0;
+ mqe = n->messages;
+ while (mqe != NULL)
+ {
+ queue_size++;
+ mqe = mqe->next;
+ }
+ if (queue_size >= MAX_PEER_QUEUE_SIZE)
+ {
+#if DEBUG_CORE_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Not considering client transmission requests: queue full\n");
+#endif
+ return; /* queue still full */
+ }
+ /* find highest priority request */
+ pos = n->active_client_request_head;
+ car = NULL;
+ while (pos != NULL)
+ {
+ if ((car == NULL) || (pos->priority > car->priority))
+ car = pos;
+ pos = pos->next;
+ }
+ }
+ else
+ {
+ car = n->active_client_request_head;
+ }
+ if (car == NULL)
+ return; /* no pending requests */
+#if DEBUG_CORE_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Permitting client transmission request to `%s'\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ c = car->client;
+ GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
+ n->active_client_request_tail, car);
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (c->requests,
+ &n->peer.hashPubKey,
+ car));
+ smr.header.size = htons (sizeof (struct SendMessageReady));
+ smr.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_READY);
+ smr.size = htons (car->msize);
+ smr.smr_id = car->smr_id;
+ smr.peer = n->peer;
+ send_to_client (c, &smr.header, GNUNET_NO);
+ GNUNET_free (car);
+}
+
+
+
+/**
+ * Free the given entry for the neighbour (it has
+ * already been removed from the list at this point).
+ *
+ * @param n neighbour to free
+ */
+static void
+free_neighbour (struct Neighbour *n)
+{
+ struct MessageEntry *m;
+ struct ClientActiveRequest *car;
+
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Destroying neighbour entry for peer `%4s'\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ if (n->skm != NULL)
+ {
+ GNUNET_free (n->skm);
+ n->skm = NULL;
+ }
+ while (NULL != (m = n->messages))
+ {
+ n->messages = m->next;
+ GNUNET_free (m);
+ }
+ while (NULL != (m = n->encrypted_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (n->encrypted_head, n->encrypted_tail, m);
+ GNUNET_free (m);
+ }
+ while (NULL != (car = n->active_client_request_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
+ n->active_client_request_tail, car);
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
+ &n->peer.hashPubKey,
+ car));
+ GNUNET_free (car);
+ }
+ if (NULL != n->th)
+ {
+ GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
+ n->th = NULL;
+ }
+ if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
+ if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (n->quota_update_task);
+ if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (n->dead_clean_task);
+ if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (n->keep_alive_task);
+ if (n->status == PEER_STATE_KEY_CONFIRMED)
+ GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"),
+ -1, GNUNET_NO);
+ GNUNET_array_grow (n->ats, n->ats_count, 0);
+ GNUNET_free_non_null (n->pending_ping);
+ GNUNET_free_non_null (n->pending_pong);
+ GNUNET_free (n);
+}
+
+
+
+/**
+ * Task triggered when a neighbour entry is about to time out
+ * (and we should prevent this by sending a PING).
+ *
+ * @param cls the 'struct Neighbour'
+ * @param tc scheduler context (not used)
+ */
+static void
+send_keep_alive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Neighbour *n = cls;
+ struct GNUNET_TIME_Relative retry;
+ struct GNUNET_TIME_Relative left;
+ struct MessageEntry *me;
+ struct PingMessage pp;
+ struct PingMessage *pm;
+ struct GNUNET_CRYPTO_AesInitializationVector iv;
+
+ n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
+ /* send PING */
+ me = GNUNET_malloc (sizeof (struct MessageEntry) +
+ sizeof (struct PingMessage));
+ me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
+ me->priority = PING_PRIORITY;
+ me->size = sizeof (struct PingMessage);
+ GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head, n->encrypted_tail,
+ n->encrypted_tail, me);
+ pm = (struct PingMessage *) &me[1];
+ pm->header.size = htons (sizeof (struct PingMessage));
+ pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
+ pm->iv_seed =
+ GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
+ derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
+ pp.challenge = n->ping_challenge;
+ pp.target = n->peer;
+#if DEBUG_HANDSHAKE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Encrypting `%s' message with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
+ "PING", (unsigned int) n->ping_challenge, GNUNET_i2s (&n->peer),
+ (unsigned int) n->encrypt_key.crc32, GNUNET_CRYPTO_crc32_n (&iv,
+ sizeof
+ (iv)),
+ pm->iv_seed);
+#endif
+ do_encrypt (n, &iv, &pp.target, &pm->target,
+ sizeof (struct PingMessage) - ((void *) &pm->target -
+ (void *) pm));
+ process_encrypted_neighbour_queue (n);
+ /* reschedule PING job */
+ left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
+ retry =
+ GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
+ MIN_PING_FREQUENCY);
+ n->keep_alive_task =
+ GNUNET_SCHEDULER_add_delayed (retry, &send_keep_alive, n);
+
+}
+
+/**
+ * Consider freeing the given neighbour since we may not need
+ * to keep it around anymore.
+ *
+ * @param n neighbour to consider discarding
+ */
+static void
+consider_free_neighbour (struct Neighbour *n);
+
+
+/**
+ * Task triggered when a neighbour entry might have gotten stale.
+ *
+ * @param cls the 'struct Neighbour'
+ * @param tc scheduler context (not used)
+ */
+static void
+consider_free_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Neighbour *n = cls;
+
+ n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
+ consider_free_neighbour (n);
+}
+
+
+/**
+ * Consider freeing the given neighbour since we may not need
+ * to keep it around anymore.
+ *
+ * @param n neighbour to consider discarding
+ */
+static void
+consider_free_neighbour (struct Neighbour *n)
+{
+ struct GNUNET_TIME_Relative left;
+
+ if ((n->th != NULL) || (n->pitr != NULL) || (GNUNET_YES == n->is_connected))
+ return; /* no chance */
+
+ left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
+ if (left.rel_value > 0)
+ {
+ if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (n->dead_clean_task);
+ n->dead_clean_task =
+ GNUNET_SCHEDULER_add_delayed (left, &consider_free_task, n);
+ return;
+ }
+ /* actually free the neighbour... */
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (neighbours,
+ &n->peer.hashPubKey, n));
+ GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
+ GNUNET_CONTAINER_multihashmap_size (neighbours),
+ GNUNET_NO);
+ free_neighbour (n);
+}
+
+
+/**
+ * Function called when the transport service is ready to
+ * receive an encrypted message for the respective peer
+ *
+ * @param cls neighbour to use message from
+ * @param size number of bytes we can transmit
+ * @param buf where to copy the message
+ * @return number of bytes transmitted
+ */
+static size_t
+notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
+{
+ struct Neighbour *n = cls;
+ struct MessageEntry *m;
+ size_t ret;
+ char *cbuf;
+
+ n->th = NULL;
+ m = n->encrypted_head;
+ if (m == NULL)
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
+ GNUNET_i2s (&n->peer));
+#endif
+ return 0;
+ }
+ GNUNET_CONTAINER_DLL_remove (n->encrypted_head, n->encrypted_tail, m);
+ ret = 0;
+ cbuf = buf;
+ if (buf != NULL)
+ {
+ GNUNET_assert (size >= m->size);
+ memcpy (cbuf, &m[1], m->size);
+ ret = m->size;
+ GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window, m->size);
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Copied message of type %u and size %u into transport buffer for `%4s'\n",
+ (unsigned int)
+ ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
+ (unsigned int) ret, GNUNET_i2s (&n->peer));
+#endif
+ process_encrypted_neighbour_queue (n);
+ }
+ else
+ {
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmission of message of type %u and size %u failed\n",
+ (unsigned int)
+ ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
+ (unsigned int) m->size);
+#endif
+ }
+ GNUNET_free (m);
+ consider_free_neighbour (n);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop
+ ("# encrypted bytes given to transport"), ret,
+ GNUNET_NO);
+ return ret;
+}
+
+
+/**
+ * Check if we have encrypted messages for the specified neighbour
+ * pending, and if so, check with the transport about sending them
+ * out.
+ *
+ * @param n neighbour to check.
+ */
+static void
+process_encrypted_neighbour_queue (struct Neighbour *n)
+{
+ struct MessageEntry *m;
+
+ if (n->th != NULL)
+ return; /* request already pending */
+ if (GNUNET_YES != n->is_connected)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ m = n->encrypted_head;
+ if (m == NULL)
+ {
+ /* encrypted queue empty, try plaintext instead */
+ process_plaintext_neighbour_queue (n);
+ return;
+ }
+#if DEBUG_CORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
+ (unsigned int) m->size, GNUNET_i2s (&n->peer),
+ (unsigned long long)
+ GNUNET_TIME_absolute_get_remaining (m->deadline).rel_value);
+#endif
+ n->th =
+ GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer, m->size,
+ m->priority,
+ GNUNET_TIME_absolute_get_remaining
+ (m->deadline),
+ ¬ify_encrypted_transmit_ready,
+ n);
+ if (n->th == NULL)
+ {
+ /* message request too large or duplicate request */
+ GNUNET_break (0);
+ /* discard encrypted message */
+ GNUNET_CONTAINER_DLL_remove (n->encrypted_head, n->encrypted_tail, m);
+ GNUNET_free (m);
+ process_encrypted_neighbour_queue (n);
+ }
+}
+
+
+/**
+ * Initialize a new 'struct Neighbour'.
+ *
+ * @param pid ID of the new neighbour
+ * @return handle for the new neighbour
+ */
+static struct Neighbour *
+create_neighbour (const struct GNUNET_PeerIdentity *pid)
+{
+ struct Neighbour *n;
+ struct GNUNET_TIME_Absolute now;
+
+#if DEBUG_CORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Creating neighbour entry for peer `%4s'\n", GNUNET_i2s (pid));
+#endif
+ n = GNUNET_malloc (sizeof (struct Neighbour));
+ n->peer = *pid;
+ GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
+ now = GNUNET_TIME_absolute_get ();
+ n->encrypt_key_created = now;
+ n->last_activity = now;
+ n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
+ n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
+ n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
+ n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
+ n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
+ n->ping_challenge =
+ GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_put (neighbours,
+ &n->peer.hashPubKey, n,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
+ GNUNET_CONTAINER_multihashmap_size (neighbours),
+ GNUNET_NO);
+ neighbour_quota_update (n, NULL);
+ consider_free_neighbour (n);
+ return n;
+}
+
+
+int
+GSC_NEIGHBOURS_init ()
+{
+ neighbours = GNUNET_CONTAINER_multihashmap_create (128);
+ self.public_key = &my_public_key;
+ self.peer = my_identity;
+ self.last_activity = GNUNET_TIME_UNIT_FOREVER_ABS;
+ self.status = PEER_STATE_KEY_CONFIRMED;
+ self.is_connected = GNUNET_YES;
+ return GNUNET_OK;
+}
+
+
+void
+GSC_NEIGHBOURS_done ()
+{
+ GNUNET_CONTAINER_multihashmap_iterate (neighbours, &free_neighbour_helper,
+ NULL);
+ GNUNET_CONTAINER_multihashmap_destroy (neighbours);
+ neighbours = NULL;
+ GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
+ 0, GNUNET_NO);
+}
--- /dev/null
+
+/**
+ * Bitmap of message types this peer is able to handle.
+ */
+static uint32_t my_type_map[(UINT16_MAX + 1) / 32];
+
+
+/**
+ * Compute a type map message for this peer.
+ *
+ * @return this peers current type map message.
+ */
+static struct GNUNET_MessageHeader *
+compute_type_map_message ()
+{
+ char *tmp;
+ uLongf dlen;
+ struct GNUNET_MessageHeader *hdr;
+
+#ifdef compressBound
+ dlen = compressBound (sizeof (my_type_map));
+#else
+ dlen = sizeof (my_type_map) + (sizeof (my_type_map) / 100) + 20;
+ /* documentation says 100.1% oldSize + 12 bytes, but we
+ * should be able to overshoot by more to be safe */
+#endif
+ hdr = GNUNET_malloc (dlen + sizeof (struct GNUNET_MessageHeader));
+ hdr->size = htons ((uint16_t) dlen + sizeof (struct GNUNET_MessageHeader));
+ tmp = (char *) &hdr[1];
+ if ((Z_OK !=
+ compress2 ((Bytef *) tmp, &dlen, (const Bytef *) my_type_map,
+ sizeof (my_type_map), 9)) || (dlen >= sizeof (my_type_map)))
+ {
+ dlen = sizeof (my_type_map);
+ memcpy (tmp, my_type_map, sizeof (my_type_map));
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_CORE_BINARY_TYPE_MAP);
+ }
+ else
+ {
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_CORE_COMPRESSED_TYPE_MAP);
+ }
+ return hdr;
+}
+
+
+/**
+ * Send a type map message to the neighbour.
+ *
+ * @param cls the type map message
+ * @param key neighbour's identity
+ * @param value 'struct Neighbour' of the target
+ * @return always GNUNET_OK
+ */
+static int
+send_type_map_to_neighbour (void *cls, const GNUNET_HashCode * key, void *value)
+{
+ struct GNUNET_MessageHeader *hdr = cls;
+ struct Neighbour *n = value;
+ struct MessageEntry *m;
+ uint16_t size;
+
+ if (n == &self)
+ return GNUNET_OK;
+ size = ntohs (hdr->size);
+ m = GNUNET_malloc (sizeof (struct MessageEntry) + size);
+ memcpy (&m[1], hdr, size);
+ m->deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
+ m->slack_deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
+ m->priority = UINT_MAX;
+ m->sender_status = n->status;
+ m->size = size;
+ m->next = n->messages;
+ n->messages = m;
+ return GNUNET_OK;
+}
+
+
+
+/**
+ * Send my type map to all connected peers (it got changed).
+ */
+static void
+broadcast_my_type_map ()
+{
+ struct GNUNET_MessageHeader *hdr;
+
+ if (NULL == neighbours)
+ return;
+ hdr = compute_type_map_message ();
+ GNUNET_CONTAINER_multihashmap_iterate (neighbours,
+ &send_type_map_to_neighbour, hdr);
+ GNUNET_free (hdr);
+}
+
+
+
projects / oweals / gnunet.git / commitdiff