/*
This file is part of GNUnet.
- (C) 2012, 2013 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2012, 2013 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
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.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
-/**
+/**
* @file multicast/multicast_api.c
- * @brief multicast service; establish tunnels to distant peers
+ * @brief Multicast service; implements multicast groups using CADET connections.
* @author Christian Grothoff
* @author Gabor X Toth
*/
+
#include "platform.h"
+#include "gnunet_util_lib.h"
#include "gnunet_multicast_service.h"
+#include "multicast.h"
+
+#define LOG(kind,...) GNUNET_log_from (kind, "multicast-api",__VA_ARGS__)
+
-/**
- * Opaque handle for a multicast group member.
+/**
+ * Handle for a request to send a message to all multicast group members
+ * (from the origin).
*/
-struct GNUNET_MULTICAST_Member
+struct GNUNET_MULTICAST_OriginTransmitHandle
{
+ GNUNET_MULTICAST_OriginTransmitNotify notify;
+ void *notify_cls;
+ struct GNUNET_MULTICAST_Origin *origin;
+
+ uint64_t message_id;
+ uint64_t group_generation;
+ uint64_t fragment_offset;
};
-/**
- * Handle for the origin of a multicast group.
+/**
+ * Handle for a message to be delivered from a member to the origin.
*/
-struct GNUNET_MULTICAST_Origin
+struct GNUNET_MULTICAST_MemberTransmitHandle
{
-};
+ GNUNET_MULTICAST_MemberTransmitNotify notify;
+ void *notify_cls;
+ struct GNUNET_MULTICAST_Member *member;
+ uint64_t request_id;
+ uint64_t fragment_offset;
+};
-GNUNET_NETWORK_STRUCT_BEGIN
-/**
- * Header of a request from a member to the origin.
- */
-struct GNUNET_MULTICAST_RequestHeader
+struct GNUNET_MULTICAST_Group
{
- /**
- * Header for all requests from a member to the origin.
+ /**
+ * Configuration to use.
*/
- struct GNUNET_MessageHeader header;
+ const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
- * Public key of the sending member.
+ * Client connection to the service.
*/
- struct GNUNET_CRYPTO_EccPublicSignKey member_key;
+ struct GNUNET_MQ_Handle *mq;
- /**
- * ECC signature of the request fragment.
- *
- * Signature must match the public key of the multicast group.
+ /**
+ * Message to send on connect.
*/
- struct GNUNET_CRYPTO_EccSignature signature;
+ struct GNUNET_MQ_Envelope *connect_env;
- /**
- * Purpose for the signature and size of the signed data.
+ /**
+ * Time to wait until we try to reconnect on failure.
*/
- struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
+ struct GNUNET_TIME_Relative reconnect_delay;
- /**
- * Number of the request fragment, monotonically increasing.
+ /**
+ * Task for reconnecting when the listener fails.
*/
- uint64_t fragment_id GNUNET_PACKED;
+ struct GNUNET_SCHEDULER_Task *reconnect_task;
- /**
- * Byte offset of this @e fragment of the @e request.
- */
- uint64_t fragment_offset GNUNET_PACKED;
-
- /**
- * Number of the request this fragment belongs to.
- *
- * Set in GNUNET_MULTICAST_origin_to_all().
- */
- uint64_t request_id GNUNET_PACKED;
+ GNUNET_MULTICAST_JoinRequestCallback join_req_cb;
+ GNUNET_MULTICAST_ReplayFragmentCallback replay_frag_cb;
+ GNUNET_MULTICAST_ReplayMessageCallback replay_msg_cb;
+ GNUNET_MULTICAST_MessageCallback message_cb;
+ void *cb_cls;
/**
- * Flags for this request.
+ * Function called after disconnected from the service.
*/
- enum GNUNET_MULTICAST_MessageFlags flags GNUNET_PACKED;
-
- /* Followed by request body. */
-};
+ GNUNET_ContinuationCallback disconnect_cb;
-/**
- * Header of a join request sent to the origin or another member.
- */
-struct GNUNET_MULTICAST_JoinRequest
-{
- /**
- * Header for the join request.
+ /**
+ * Closure for @a disconnect_cb.
*/
- struct GNUNET_MessageHeader header;
+ void *disconnect_cls;
- /**
- * ECC signature of the rest of the fields of the join request.
- *
- * Signature must match the public key of the joining member.
+ /**
+ * Are we currently transmitting a message?
*/
- struct GNUNET_CRYPTO_EccSignature signature;
+ uint8_t in_transmit;
- /**
- * Purpose for the signature and size of the signed data.
+ /**
+ * Number of MULTICAST_FRAGMENT_ACK messages we are still waiting for.
*/
- struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
+ uint8_t acks_pending;
/**
- * Public key of the target group.
+ * Is this the origin or a member?
*/
- struct GNUNET_CRYPTO_EccPublicSignKey group_key;
+ uint8_t is_origin;
/**
- * Public key of the joining member.
+ * Is this channel in the process of disconnecting from the service?
+ * #GNUNET_YES or #GNUNET_NO
*/
- struct GNUNET_CRYPTO_EccPublicSignKey member_key;
+ uint8_t is_disconnecting;
+};
+
+
+/**
+ * Handle for the origin of a multicast group.
+ */
+struct GNUNET_MULTICAST_Origin
+{
+ struct GNUNET_MULTICAST_Group grp;
+ struct GNUNET_MULTICAST_OriginTransmitHandle tmit;
+
+ GNUNET_MULTICAST_RequestCallback request_cb;
+};
+
+
+/**
+ * Handle for a multicast group member.
+ */
+struct GNUNET_MULTICAST_Member
+{
+ struct GNUNET_MULTICAST_Group grp;
+ struct GNUNET_MULTICAST_MemberTransmitHandle tmit;
+
+ GNUNET_MULTICAST_JoinDecisionCallback join_dcsn_cb;
/**
- * Peer identity of the joining member.
+ * Replay fragment -> struct GNUNET_MULTICAST_MemberReplayHandle *
*/
- struct GNUNET_PeerIdentity member_peer;
+ struct GNUNET_CONTAINER_MultiHashMap *replay_reqs;
- /* Followed by request body. */
+ uint64_t next_fragment_id;
};
-GNUNET_NETWORK_STRUCT_END
-
-/**
+/**
* Handle that identifies a join request.
*
- * Used to match calls to #GNUNET_MULTICAST_JoinCallback to the
+ * Used to match calls to #GNUNET_MULTICAST_JoinRequestCallback to the
* corresponding calls to #GNUNET_MULTICAST_join_decision().
*/
struct GNUNET_MULTICAST_JoinHandle
{
+ struct GNUNET_MULTICAST_Group *group;
+
+ /**
+ * Public key of the member requesting join.
+ */
+ struct GNUNET_CRYPTO_EcdsaPublicKey member_pub_key;
+
+ /**
+ * Peer identity of the member requesting join.
+ */
+ struct GNUNET_PeerIdentity peer;
+};
+
+
+/**
+ * Opaque handle to a replay request from the multicast service.
+ */
+struct GNUNET_MULTICAST_ReplayHandle
+{
+ struct GNUNET_MULTICAST_Group *grp;
+ struct MulticastReplayRequestMessage req;
};
-/**
+/**
+ * Handle for a replay request.
+ */
+struct GNUNET_MULTICAST_MemberReplayHandle
+{
+};
+
+
+static void
+origin_to_all (struct GNUNET_MULTICAST_Origin *orig);
+
+static void
+member_to_origin (struct GNUNET_MULTICAST_Member *mem);
+
+
+/**
+ * Check join request message.
+ */
+static int
+check_group_join_request (void *cls,
+ const struct MulticastJoinRequestMessage *jreq)
+{
+ uint16_t size = ntohs (jreq->header.size);
+
+ if (sizeof (*jreq) == size)
+ return GNUNET_OK;
+
+ if (sizeof (*jreq) + sizeof (struct GNUNET_MessageHeader) <= size)
+ return GNUNET_OK;
+
+ return GNUNET_SYSERR;
+}
+
+
+/**
+ * Receive join request from service.
+ */
+static void
+handle_group_join_request (void *cls,
+ const struct MulticastJoinRequestMessage *jreq)
+{
+ struct GNUNET_MULTICAST_Group *grp = cls;
+ struct GNUNET_MULTICAST_JoinHandle *jh;
+ const struct GNUNET_MessageHeader *jmsg = NULL;
+
+ if (NULL == grp)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ if (NULL == grp->join_req_cb)
+ return;
+
+ if (sizeof (*jreq) + sizeof (*jmsg) <= ntohs (jreq->header.size))
+ jmsg = (const struct GNUNET_MessageHeader *) &jreq[1];
+
+ jh = GNUNET_malloc (sizeof (*jh));
+ jh->group = grp;
+ jh->member_pub_key = jreq->member_pub_key;
+ jh->peer = jreq->peer;
+ grp->join_req_cb (grp->cb_cls, &jreq->member_pub_key, jmsg, jh);
+
+ grp->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
+}
+
+
+/**
+ * Check multicast message.
+ */
+static int
+check_group_message (void *cls,
+ const struct GNUNET_MULTICAST_MessageHeader *mmsg)
+{
+ return GNUNET_OK;
+}
+
+
+/**
+ * Receive multicast message from service.
+ */
+static void
+handle_group_message (void *cls,
+ const struct GNUNET_MULTICAST_MessageHeader *mmsg)
+{
+ struct GNUNET_MULTICAST_Group *grp = cls;
+
+ if (GNUNET_YES == grp->is_disconnecting)
+ return;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Calling message callback with a message of size %u.\n",
+ ntohs (mmsg->header.size));
+
+ if (NULL != grp->message_cb)
+ grp->message_cb (grp->cb_cls, mmsg);
+
+ grp->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
+}
+
+
+/**
+ * Receive message/request fragment acknowledgement from service.
+ */
+static void
+handle_group_fragment_ack (void *cls,
+ const struct GNUNET_MessageHeader *msg)
+{
+ struct GNUNET_MULTICAST_Group *grp = cls;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "%p Got fragment ACK. in_transmit=%u, acks_pending=%u\n",
+ grp, grp->in_transmit, grp->acks_pending);
+
+ if (0 == grp->acks_pending)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "%p Ignoring extraneous fragment ACK.\n", grp);
+ return;
+ }
+ grp->acks_pending--;
+
+ if (GNUNET_YES != grp->in_transmit)
+ return;
+
+ if (GNUNET_YES == grp->is_origin)
+ origin_to_all ((struct GNUNET_MULTICAST_Origin *) grp);
+ else
+ member_to_origin ((struct GNUNET_MULTICAST_Member *) grp);
+
+ grp->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
+}
+
+
+/**
+ * Check unicast request.
+ */
+static int
+check_origin_request (void *cls,
+ const struct GNUNET_MULTICAST_RequestHeader *req)
+{
+ return GNUNET_OK;
+}
+
+
+/**
+ * Origin receives unicast request from a member.
+ */
+static void
+handle_origin_request (void *cls,
+ const struct GNUNET_MULTICAST_RequestHeader *req)
+{
+ struct GNUNET_MULTICAST_Group *grp;
+ struct GNUNET_MULTICAST_Origin *orig = cls;
+ grp = &orig->grp;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Calling request callback with a request of size %u.\n",
+ ntohs (req->header.size));
+
+ if (NULL != orig->request_cb)
+ orig->request_cb (grp->cb_cls, req);
+
+ grp->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
+}
+
+
+/**
+ * Receive multicast replay request from service.
+ */
+static void
+handle_group_replay_request (void *cls,
+ const struct MulticastReplayRequestMessage *rep)
+
+{
+ struct GNUNET_MULTICAST_Group *grp = cls;
+
+ if (GNUNET_YES == grp->is_disconnecting)
+ return;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got replay request.\n");
+
+ if (0 != rep->fragment_id)
+ {
+ if (NULL != grp->replay_frag_cb)
+ {
+ struct GNUNET_MULTICAST_ReplayHandle * rh = GNUNET_malloc (sizeof (*rh));
+ rh->grp = grp;
+ rh->req = *rep;
+ grp->replay_frag_cb (grp->cb_cls, &rep->member_pub_key,
+ GNUNET_ntohll (rep->fragment_id),
+ GNUNET_ntohll (rep->flags), rh);
+ }
+ }
+ else if (0 != rep->message_id)
+ {
+ if (NULL != grp->replay_msg_cb)
+ {
+ struct GNUNET_MULTICAST_ReplayHandle * rh = GNUNET_malloc (sizeof (*rh));
+ rh->grp = grp;
+ rh->req = *rep;
+ grp->replay_msg_cb (grp->cb_cls, &rep->member_pub_key,
+ GNUNET_ntohll (rep->message_id),
+ GNUNET_ntohll (rep->fragment_offset),
+ GNUNET_ntohll (rep->flags), rh);
+ }
+ }
+
+ grp->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
+}
+
+
+/**
+ * Check replay response.
+ */
+static int
+check_member_replay_response (void *cls,
+ const struct MulticastReplayResponseMessage *res)
+{
+ uint16_t size = ntohs (res->header.size);
+
+ if (sizeof (*res) == size)
+ return GNUNET_OK;
+
+ if (sizeof (*res) + sizeof (struct GNUNET_MULTICAST_MessageHeader) <= size)
+ return GNUNET_OK;
+
+ return GNUNET_SYSERR;
+}
+
+
+/**
+ * Receive replay response from service.
+ */
+static void
+handle_member_replay_response (void *cls,
+ const struct MulticastReplayResponseMessage *res)
+{
+ struct GNUNET_MULTICAST_Group *grp;
+ struct GNUNET_MULTICAST_Member *mem = cls;
+ grp = &mem->grp;
+
+ if (GNUNET_YES == grp->is_disconnecting)
+ return;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got replay response.\n");
+
+ // FIXME: return result
+}
+
+
+/**
+ * Check join decision.
+ */
+static int
+check_member_join_decision (void *cls,
+ const struct MulticastJoinDecisionMessageHeader *hdcsn)
+{
+ return GNUNET_OK; // checked in handle below
+}
+
+
+/**
+ * Member receives join decision.
+ */
+static void
+handle_member_join_decision (void *cls,
+ const struct MulticastJoinDecisionMessageHeader *hdcsn)
+{
+ struct GNUNET_MULTICAST_Group *grp;
+ struct GNUNET_MULTICAST_Member *mem = cls;
+ grp = &mem->grp;
+
+ const struct MulticastJoinDecisionMessage *
+ dcsn = (const struct MulticastJoinDecisionMessage *) &hdcsn[1];
+
+ uint16_t dcsn_size = ntohs (dcsn->header.size);
+ int is_admitted = ntohl (dcsn->is_admitted);
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "%p Member got join decision from multicast: %d\n",
+ mem, is_admitted);
+
+ const struct GNUNET_MessageHeader *join_resp = NULL;
+ uint16_t join_resp_size = 0;
+
+ uint16_t relay_count = ntohl (dcsn->relay_count);
+ const struct GNUNET_PeerIdentity *relays = NULL;
+ uint16_t relay_size = relay_count * sizeof (*relays);
+ if (0 < relay_count)
+ {
+ if (dcsn_size < sizeof (*dcsn) + relay_size)
+ {
+ GNUNET_break_op (0);
+ is_admitted = GNUNET_SYSERR;
+ }
+ else
+ {
+ relays = (struct GNUNET_PeerIdentity *) &dcsn[1];
+ }
+ }
+
+ if (sizeof (*dcsn) + relay_size + sizeof (*join_resp) <= dcsn_size)
+ {
+ join_resp = (const struct GNUNET_MessageHeader *) ((char *) &dcsn[1] + relay_size);
+ join_resp_size = ntohs (join_resp->size);
+ }
+ if (dcsn_size < sizeof (*dcsn) + relay_size + join_resp_size)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received invalid join decision message from multicast: %u < %u + %u + %u\n",
+ dcsn_size , sizeof (*dcsn), relay_size, join_resp_size);
+ GNUNET_break_op (0);
+ is_admitted = GNUNET_SYSERR;
+ }
+
+ if (NULL != mem->join_dcsn_cb)
+ mem->join_dcsn_cb (grp->cb_cls, is_admitted, &hdcsn->peer,
+ relay_count, relays, join_resp);
+
+ // FIXME:
+ //if (GNUNET_YES != is_admitted)
+ // GNUNET_MULTICAST_member_part (mem);
+
+ grp->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
+}
+
+
+static void
+group_cleanup (struct GNUNET_MULTICAST_Group *grp)
+{
+ if (NULL != grp->connect_env)
+ {
+ GNUNET_MQ_discard (grp->connect_env);
+ grp->connect_env = NULL;
+ }
+ if (NULL != grp->mq)
+ {
+ GNUNET_MQ_destroy (grp->mq);
+ grp->mq = NULL;
+ }
+ if (NULL != grp->disconnect_cb)
+ {
+ grp->disconnect_cb (grp->disconnect_cls);
+ grp->disconnect_cb = NULL;
+ }
+ GNUNET_free (grp);
+}
+
+
+static void
+group_disconnect (struct GNUNET_MULTICAST_Group *grp,
+ GNUNET_ContinuationCallback cb,
+ void *cls)
+{
+ grp->is_disconnecting = GNUNET_YES;
+ grp->disconnect_cb = cb;
+ grp->disconnect_cls = cls;
+
+ if (NULL != grp->mq)
+ {
+ struct GNUNET_MQ_Envelope *last = GNUNET_MQ_get_last_envelope (grp->mq);
+ if (NULL != last)
+ {
+ GNUNET_MQ_notify_sent (last,
+ (GNUNET_MQ_NotifyCallback) group_cleanup, grp);
+ }
+ else
+ {
+ group_cleanup (grp);
+ }
+ }
+ else
+ {
+ group_cleanup (grp);
+ }
+}
+
+
+/**
* Function to call with the decision made for a join request.
*
* Must be called once and only once in response to an invocation of the
- * #GNUNET_MULTICAST_JoinCallback.
+ * #GNUNET_MULTICAST_JoinRequestCallback.
*
- * @param jh Join request handle.
- * @param is_admitted #GNUNET_YES if joining is approved,
- * #GNUNET_NO if it is disapproved
- * @param relay_count Number of relays given.
- * @param relays Array of suggested peers that might be useful relays to use
+ * @param join
+ * Join request handle.
+ * @param is_admitted
+ * #GNUNET_YES if the join is approved,
+ * #GNUNET_NO if it is disapproved,
+ * #GNUNET_SYSERR if we cannot answer the request.
+ * @param relay_count
+ * Number of relays given.
+ * @param relays
+ * Array of suggested peers that might be useful relays to use
* when joining the multicast group (essentially a list of peers that
* are already part of the multicast group and might thus be willing
* to help with routing). If empty, only this local peer (which must
* be the multicast origin) is a good candidate for building the
* multicast tree. Note that it is unnecessary to specify our own
* peer identity in this array.
- * @param join_response Message to send in response to the joining peer;
+ * @param join_resp
+ * Message to send in response to the joining peer;
* can also be used to redirect the peer to a different group at the
* application layer; this response is to be transmitted to the
* peer that issued the request even if admission is denied.
*/
struct GNUNET_MULTICAST_ReplayHandle *
-GNUNET_MULTICAST_join_decision (struct GNUNET_MULTICAST_JoinHandle *jh,
+GNUNET_MULTICAST_join_decision (struct GNUNET_MULTICAST_JoinHandle *join,
int is_admitted,
- unsigned int relay_count,
+ uint16_t relay_count,
const struct GNUNET_PeerIdentity *relays,
- const struct GNUNET_MessageHeader *join_response)
+ const struct GNUNET_MessageHeader *join_resp)
{
+ struct GNUNET_MULTICAST_Group *grp = join->group;
+ uint16_t join_resp_size = (NULL != join_resp) ? ntohs (join_resp->size) : 0;
+ uint16_t relay_size = relay_count * sizeof (*relays);
+
+ struct MulticastJoinDecisionMessageHeader *hdcsn;
+ struct MulticastJoinDecisionMessage *dcsn;
+ struct GNUNET_MQ_Envelope *
+ env = GNUNET_MQ_msg_extra (hdcsn, sizeof (*dcsn) + relay_size + join_resp_size,
+ GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_DECISION);
+ hdcsn->member_pub_key = join->member_pub_key;
+ hdcsn->peer = join->peer;
+
+ dcsn = (struct MulticastJoinDecisionMessage *) &hdcsn[1];
+ dcsn->header.type = htons (GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_DECISION);
+ dcsn->header.size = htons (sizeof (*dcsn) + relay_size + join_resp_size);
+ dcsn->is_admitted = htonl (is_admitted);
+ dcsn->relay_count = htonl (relay_count);
+ if (0 < relay_size)
+ GNUNET_memcpy (&dcsn[1], relays, relay_size);
+ if (0 < join_resp_size)
+ GNUNET_memcpy (((char *) &dcsn[1]) + relay_size, join_resp, join_resp_size);
+
+ GNUNET_MQ_send (grp->mq, env);
+ GNUNET_free (join);
return NULL;
}
-/**
- * Handle to pass back for the answer of a membership test.
- */
-struct GNUNET_MULTICAST_MembershipTestHandle
-{
-};
-
-
-/**
- * Call informing multicast about the decision taken for a membership test.
- *
- * @param mth Handle that was given for the query.
- * @param result #GNUNET_YES if peer was a member, #GNUNET_NO if peer was not a member,
- * #GNUNET_SYSERR if we cannot answer the membership test.
- */
-void
-GNUNET_MULTICAST_membership_test_result (struct GNUNET_MULTICAST_MembershipTestHandle *mth,
- int result)
-{
-}
-
-
-/**
- * Opaque handle to a replay request from the multicast service.
- */
-struct GNUNET_MULTICAST_ReplayHandle
-{
-};
-
-
-/**
+/**
* Replay a message fragment for the multicast group.
*
- * @param rh Replay handle identifying which replay operation was requested.
- * @param msg Replayed message fragment, NULL if unknown/error.
- * @param ec Error code.
+ * @param rh
+ * Replay handle identifying which replay operation was requested.
+ * @param msg
+ * Replayed message fragment, NULL if not found / an error occurred.
+ * @param ec
+ * Error code. See enum GNUNET_MULTICAST_ReplayErrorCode
+ * If not #GNUNET_MULTICAST_REC_OK, the replay handle is invalidated.
*/
void
GNUNET_MULTICAST_replay_response (struct GNUNET_MULTICAST_ReplayHandle *rh,
const struct GNUNET_MessageHeader *msg,
enum GNUNET_MULTICAST_ReplayErrorCode ec)
{
+ uint8_t msg_size = (NULL != msg) ? ntohs (msg->size) : 0;
+ struct MulticastReplayResponseMessage *res;
+ struct GNUNET_MQ_Envelope *
+ env = GNUNET_MQ_msg_extra (res, msg_size,
+ GNUNET_MESSAGE_TYPE_MULTICAST_REPLAY_RESPONSE);
+ res->fragment_id = rh->req.fragment_id;
+ res->message_id = rh->req.message_id;
+ res->fragment_offset = rh->req.fragment_offset;
+ res->flags = rh->req.flags;
+ res->error_code = htonl (ec);
+
+ if (GNUNET_MULTICAST_REC_OK == ec)
+ {
+ GNUNET_assert (NULL != msg);
+ GNUNET_memcpy (&res[1], msg, msg_size);
+ }
+
+ GNUNET_MQ_send (rh->grp->mq, env);
+
+ if (GNUNET_MULTICAST_REC_OK != ec)
+ GNUNET_free (rh);
}
-/**
+/**
* Indicate the end of the replay session.
*
* Invalidates the replay handle.
*
- * @param rh Replay session to end.
+ * @param rh
+ * Replay session to end.
*/
void
GNUNET_MULTICAST_replay_response_end (struct GNUNET_MULTICAST_ReplayHandle *rh)
{
+ struct MulticastReplayResponseMessage *end;
+ struct GNUNET_MQ_Envelope *
+ env = GNUNET_MQ_msg (end, GNUNET_MESSAGE_TYPE_MULTICAST_REPLAY_RESPONSE_END);
+
+ end->fragment_id = rh->req.fragment_id;
+ end->message_id = rh->req.message_id;
+ end->fragment_offset = rh->req.fragment_offset;
+ end->flags = rh->req.flags;
+
+ GNUNET_MQ_send (rh->grp->mq, env);
+ GNUNET_free (rh);
}
-/**
+/**
* Replay a message for the multicast group.
*
- * @param rh Replay handle identifying which replay operation was requested.
- * @param notify Function to call to get the message.
- * @param notify_cls Closure for @a notify.
+ * @param rh
+ * Replay handle identifying which replay operation was requested.
+ * @param notify
+ * Function to call to get the message.
+ * @param notify_cls
+ * Closure for @a notify.
*/
void
GNUNET_MULTICAST_replay_response2 (struct GNUNET_MULTICAST_ReplayHandle *rh,
}
-/**
+static void
+origin_connect (struct GNUNET_MULTICAST_Origin *orig);
+
+
+static void
+origin_reconnect (void *cls)
+{
+ origin_connect (cls);
+}
+
+
+/**
+ * Origin client disconnected from service.
+ *
+ * Reconnect after backoff period.
+ */
+static void
+origin_disconnected (void *cls, enum GNUNET_MQ_Error error)
+{
+ struct GNUNET_MULTICAST_Origin *orig = cls;
+ struct GNUNET_MULTICAST_Group *grp = &orig->grp;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Origin client disconnected (%d), re-connecting\n",
+ (int) error);
+ if (NULL != grp->mq)
+ {
+ GNUNET_MQ_destroy (grp->mq);
+ grp->mq = NULL;
+ }
+
+ grp->reconnect_task = GNUNET_SCHEDULER_add_delayed (grp->reconnect_delay,
+ origin_reconnect,
+ orig);
+ grp->reconnect_delay = GNUNET_TIME_STD_BACKOFF (grp->reconnect_delay);
+}
+
+
+/**
+ * Connect to service as origin.
+ */
+static void
+origin_connect (struct GNUNET_MULTICAST_Origin *orig)
+{
+ struct GNUNET_MULTICAST_Group *grp = &orig->grp;
+
+ struct GNUNET_MQ_MessageHandler handlers[] = {
+ GNUNET_MQ_hd_var_size (group_message,
+ GNUNET_MESSAGE_TYPE_MULTICAST_MESSAGE,
+ struct GNUNET_MULTICAST_MessageHeader,
+ grp),
+ GNUNET_MQ_hd_var_size (origin_request,
+ GNUNET_MESSAGE_TYPE_MULTICAST_REQUEST,
+ struct GNUNET_MULTICAST_RequestHeader,
+ orig),
+ GNUNET_MQ_hd_fixed_size (group_fragment_ack,
+ GNUNET_MESSAGE_TYPE_MULTICAST_FRAGMENT_ACK,
+ struct GNUNET_MessageHeader,
+ grp),
+ GNUNET_MQ_hd_var_size (group_join_request,
+ GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_REQUEST,
+ struct MulticastJoinRequestMessage,
+ grp),
+ GNUNET_MQ_hd_fixed_size (group_replay_request,
+ GNUNET_MESSAGE_TYPE_MULTICAST_REPLAY_REQUEST,
+ struct MulticastReplayRequestMessage,
+ grp),
+ GNUNET_MQ_handler_end ()
+ };
+
+ grp->mq = GNUNET_CLIENT_connecT (grp->cfg, "multicast",
+ handlers, origin_disconnected, orig);
+ GNUNET_assert (NULL != grp->mq);
+ GNUNET_MQ_send_copy (grp->mq, grp->connect_env);
+}
+
+
+/**
* Start a multicast group.
*
* Will advertise the origin in the P2P overlay network under the respective
* candidate will be given a response. Members in the group can send messages
* to the origin (one at a time).
*
- * @param cfg Configuration to use.
- * @param priv_key ECC key that will be used to sign messages for this
+ * @param cfg
+ * Configuration to use.
+ * @param priv_key
+ * ECC key that will be used to sign messages for this
* multicast session; public key is used to identify the multicast group;
- * @param last_fragment_id Last fragment ID to continue counting fragments from
- * when restarting the origin. 0 for a new group.
- * @param join_cb Function called to approve / disapprove joining of a peer.
- * @param test_cb Function multicast can use to test group membership.
- * @param replay_frag_cb Function that can be called to replay a message fragment.
- * @param replay_msg_cb Function that can be called to replay a message.
- * @param request_cb Function called with message fragments from group members.
- * @param message_cb Function called with the message fragments sent to the
+ * @param max_fragment_id
+ * Maximum fragment ID already sent to the group.
+ * 0 for a new group.
+ * @param join_request_cb
+ * Function called to approve / disapprove joining of a peer.
+ * @param replay_frag_cb
+ * Function that can be called to replay a message fragment.
+ * @param replay_msg_cb
+ * Function that can be called to replay a message.
+ * @param request_cb
+ * Function called with message fragments from group members.
+ * @param message_cb
+ * Function called with the message fragments sent to the
* network by GNUNET_MULTICAST_origin_to_all(). These message fragments
* should be stored for answering replay requests later.
- * @param cls Closure for the various callbacks that follow.
+ * @param cls
+ * Closure for the various callbacks that follow.
+ *
* @return Handle for the origin, NULL on error.
*/
struct GNUNET_MULTICAST_Origin *
GNUNET_MULTICAST_origin_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
- const struct GNUNET_CRYPTO_EccPrivateKey *priv_key,
- uint64_t last_fragment_id,
- GNUNET_MULTICAST_JoinCallback join_cb,
- GNUNET_MULTICAST_MembershipTestCallback test_cb,
+ const struct GNUNET_CRYPTO_EddsaPrivateKey *priv_key,
+ uint64_t max_fragment_id,
+ GNUNET_MULTICAST_JoinRequestCallback join_request_cb,
GNUNET_MULTICAST_ReplayFragmentCallback replay_frag_cb,
GNUNET_MULTICAST_ReplayMessageCallback replay_msg_cb,
GNUNET_MULTICAST_RequestCallback request_cb,
GNUNET_MULTICAST_MessageCallback message_cb,
void *cls)
{
- return NULL;
+ struct GNUNET_MULTICAST_Origin *orig = GNUNET_malloc (sizeof (*orig));
+ struct GNUNET_MULTICAST_Group *grp = &orig->grp;
+
+ struct MulticastOriginStartMessage *start;
+ grp->connect_env = GNUNET_MQ_msg (start,
+ GNUNET_MESSAGE_TYPE_MULTICAST_ORIGIN_START);
+ start->max_fragment_id = max_fragment_id;
+ start->group_key = *priv_key;
+
+ grp->cfg = cfg;
+ grp->is_origin = GNUNET_YES;
+ grp->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
+
+ grp->cb_cls = cls;
+ grp->join_req_cb = join_request_cb;
+ grp->replay_frag_cb = replay_frag_cb;
+ grp->replay_msg_cb = replay_msg_cb;
+ grp->message_cb = message_cb;
+
+ orig->request_cb = request_cb;
+
+ origin_connect (orig);
+ return orig;
}
-/**
- * Handle for a request to send a message to all multicast group members
- * (from the origin).
+/**
+ * Stop a multicast group.
+ *
+ * @param origin
+ * Multicast group to stop.
*/
-struct GNUNET_MULTICAST_OriginMessageHandle
+void
+GNUNET_MULTICAST_origin_stop (struct GNUNET_MULTICAST_Origin *orig,
+ GNUNET_ContinuationCallback stop_cb,
+ void *stop_cls)
{
-};
+ struct GNUNET_MULTICAST_Group *grp = &orig->grp;
+
+ group_disconnect (grp, stop_cb, stop_cls);
+}
+
+
+static void
+origin_to_all (struct GNUNET_MULTICAST_Origin *orig)
+{
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "%p origin_to_all()\n", orig);
+ struct GNUNET_MULTICAST_Group *grp = &orig->grp;
+ struct GNUNET_MULTICAST_OriginTransmitHandle *tmit = &orig->tmit;
+ GNUNET_assert (GNUNET_YES == grp->in_transmit);
+
+ size_t buf_size = GNUNET_MULTICAST_FRAGMENT_MAX_SIZE;
+ struct GNUNET_MULTICAST_MessageHeader *msg;
+ struct GNUNET_MQ_Envelope *
+ env = GNUNET_MQ_msg_extra (msg, buf_size - sizeof(*msg),
+ GNUNET_MESSAGE_TYPE_MULTICAST_MESSAGE);
+
+ int ret = tmit->notify (tmit->notify_cls, &buf_size, &msg[1]);
+
+ if (! (GNUNET_YES == ret || GNUNET_NO == ret)
+ || GNUNET_MULTICAST_FRAGMENT_MAX_SIZE < buf_size)
+ {
+ LOG (GNUNET_ERROR_TYPE_ERROR,
+ "%p OriginTransmitNotify() returned error or invalid message size.\n",
+ orig);
+ /* FIXME: handle error */
+ GNUNET_MQ_discard (env);
+ return;
+ }
+
+ if (GNUNET_NO == ret && 0 == buf_size)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "%p OriginTransmitNotify() - transmission paused.\n", orig);
+ GNUNET_MQ_discard (env);
+ return; /* Transmission paused. */
+ }
+
+ msg->header.size = htons (sizeof (*msg) + buf_size);
+ msg->message_id = GNUNET_htonll (tmit->message_id);
+ msg->group_generation = tmit->group_generation;
+ msg->fragment_offset = GNUNET_htonll (tmit->fragment_offset);
+ tmit->fragment_offset += sizeof (*msg) + buf_size;
+
+ grp->acks_pending++;
+ GNUNET_MQ_send (grp->mq, env);
+
+ if (GNUNET_YES == ret)
+ grp->in_transmit = GNUNET_NO;
+}
-/**
+/**
* Send a message to the multicast group.
*
- * @param origin Handle to the multicast group.
- * @param message_id Application layer ID for the message. Opaque to multicast.
- * @param group_generation Group generation of the message. Documented in
- * `struct GNUNET_MULTICAST_MessageHeader`.
- * @param size Number of bytes to transmit.
- * FIXME: Needed? The end of the message can be flagged with a last fragment flag.
- * @param notify Function to call to get the message.
- * @param notify_cls Closure for @a notify.
- * @return NULL on error (i.e. request already pending).
- */
-struct GNUNET_MULTICAST_OriginMessageHandle *
-GNUNET_MULTICAST_origin_to_all (struct GNUNET_MULTICAST_Origin *origin,
+ * @param orig
+ * Handle to the multicast group.
+ * @param message_id
+ * Application layer ID for the message. Opaque to multicast.
+ * @param group_generation
+ * Group generation of the message.
+ * Documented in struct GNUNET_MULTICAST_MessageHeader.
+ * @param notify
+ * Function to call to get the message.
+ * @param notify_cls
+ * Closure for @a notify.
+ *
+ * @return Message handle on success,
+ * NULL on error (i.e. another request is already pending).
+ */
+struct GNUNET_MULTICAST_OriginTransmitHandle *
+GNUNET_MULTICAST_origin_to_all (struct GNUNET_MULTICAST_Origin *orig,
uint64_t message_id,
uint64_t group_generation,
- size_t size,
GNUNET_MULTICAST_OriginTransmitNotify notify,
void *notify_cls)
{
- return NULL;
+ struct GNUNET_MULTICAST_Group *grp = &orig->grp;
+ if (GNUNET_YES == grp->in_transmit)
+ return NULL;
+ grp->in_transmit = GNUNET_YES;
+
+ struct GNUNET_MULTICAST_OriginTransmitHandle *tmit = &orig->tmit;
+ tmit->origin = orig;
+ tmit->message_id = message_id;
+ tmit->fragment_offset = 0;
+ tmit->group_generation = group_generation;
+ tmit->notify = notify;
+ tmit->notify_cls = notify_cls;
+
+ origin_to_all (orig);
+ return tmit;
}
-/**
- * Cancel request for message transmission to multicast group.
+/**
+ * Resume message transmission to multicast group.
*
- * @param mh Request to cancel.
+ * @param th
+ * Transmission to cancel.
*/
void
-GNUNET_MULTICAST_origin_to_all_cancel (struct GNUNET_MULTICAST_OriginMessageHandle *mh)
+GNUNET_MULTICAST_origin_to_all_resume (struct GNUNET_MULTICAST_OriginTransmitHandle *th)
{
+ struct GNUNET_MULTICAST_Group *grp = &th->origin->grp;
+ if (0 != grp->acks_pending || GNUNET_YES != grp->in_transmit)
+ return;
+ origin_to_all (th->origin);
}
-/**
- * Stop a multicast group.
+/**
+ * Cancel request for message transmission to multicast group.
*
- * @param origin Multicast group to stop.
+ * @param th
+ * Transmission to cancel.
*/
void
-GNUNET_MULTICAST_origin_stop (struct GNUNET_MULTICAST_Origin *origin)
+GNUNET_MULTICAST_origin_to_all_cancel (struct GNUNET_MULTICAST_OriginTransmitHandle *th)
+{
+ th->origin->grp.in_transmit = GNUNET_NO;
+}
+
+
+static void
+member_connect (struct GNUNET_MULTICAST_Member *mem);
+
+
+static void
+member_reconnect (void *cls)
+{
+ member_connect (cls);
+}
+
+
+/**
+ * Member client disconnected from service.
+ *
+ * Reconnect after backoff period.
+ */
+static void
+member_disconnected (void *cls, enum GNUNET_MQ_Error error)
+{
+ struct GNUNET_MULTICAST_Member *mem = cls;
+ struct GNUNET_MULTICAST_Group *grp = &mem->grp;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Member client disconnected (%d), re-connecting\n",
+ (int) error);
+ GNUNET_MQ_destroy (grp->mq);
+ grp->mq = NULL;
+
+ grp->reconnect_task = GNUNET_SCHEDULER_add_delayed (grp->reconnect_delay,
+ member_reconnect,
+ mem);
+ grp->reconnect_delay = GNUNET_TIME_STD_BACKOFF (grp->reconnect_delay);
+}
+
+
+/**
+ * Connect to service as member.
+ */
+static void
+member_connect (struct GNUNET_MULTICAST_Member *mem)
{
+ struct GNUNET_MULTICAST_Group *grp = &mem->grp;
+
+ struct GNUNET_MQ_MessageHandler handlers[] = {
+ GNUNET_MQ_hd_var_size (group_message,
+ GNUNET_MESSAGE_TYPE_MULTICAST_MESSAGE,
+ struct GNUNET_MULTICAST_MessageHeader,
+ grp),
+ GNUNET_MQ_hd_fixed_size (group_fragment_ack,
+ GNUNET_MESSAGE_TYPE_MULTICAST_FRAGMENT_ACK,
+ struct GNUNET_MessageHeader,
+ grp),
+ GNUNET_MQ_hd_var_size (group_join_request,
+ GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_REQUEST,
+ struct MulticastJoinRequestMessage,
+ grp),
+ GNUNET_MQ_hd_var_size (member_join_decision,
+ GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_DECISION,
+ struct MulticastJoinDecisionMessageHeader,
+ mem),
+ GNUNET_MQ_hd_fixed_size (group_replay_request,
+ GNUNET_MESSAGE_TYPE_MULTICAST_REPLAY_REQUEST,
+ struct MulticastReplayRequestMessage,
+ grp),
+ GNUNET_MQ_hd_var_size (member_replay_response,
+ GNUNET_MESSAGE_TYPE_MULTICAST_REPLAY_RESPONSE,
+ struct MulticastReplayResponseMessage,
+ mem),
+ GNUNET_MQ_handler_end ()
+ };
+
+ grp->mq = GNUNET_CLIENT_connecT (grp->cfg, "multicast",
+ handlers, member_disconnected, mem);
+ GNUNET_assert (NULL != grp->mq);
+ GNUNET_MQ_send_copy (grp->mq, grp->connect_env);
}
-/**
+/**
* Join a multicast group.
*
* The entity joining is always the local peer. Further information about the
* @a message_cb is invoked with a (failure) response and then with NULL. If
* the join succeeds, outstanding (state) messages and ongoing multicast
* messages will be given to the @a message_cb until the member decides to part
- * the group. The @a test_cb and @a replay_cb functions may be called at
- * anytime by the multicast service to support relaying messages to other
- * members of the group.
- *
- * @param cfg Configuration to use.
- * @param group_key ECC public key that identifies the group to join.
- * @param member_key ECC key that identifies the member and used to sign
- * requests sent to the origin.
- * @param origin Peer ID of the origin to send unicast requsets to. If NULL,
+ * the group. The @a replay_cb function may be called at any time by the
+ * multicast service to support relaying messages to other members of the group.
+ *
+ * @param cfg
+ * Configuration to use.
+ * @param group_key
+ * ECC public key that identifies the group to join.
+ * @param member_key
+ * ECC key that identifies the member
+ * and used to sign requests sent to the origin.
+ * @param origin
+ * Peer ID of the origin to send unicast requsets to. If NULL,
* unicast requests are sent back via multiple hops on the reverse path
* of multicast messages.
- * @param relay_count Number of peers in the @a relays array.
- * @param relays Peer identities of members of the group, which serve as relays
+ * @param relay_count
+ * Number of peers in the @a relays array.
+ * @param relays
+ * Peer identities of members of the group, which serve as relays
* and can be used to join the group at. and send the @a join_request to.
* If empty, the @a join_request is sent directly to the @a origin.
- * @param join_request Application-dependent join request to be passed to the peer
- * @a relay (might, for example, contain a user, bind user
- * identity/pseudonym to peer identity, application-level message to
- * origin, etc.).
- * @param join_cb Function called to approve / disapprove joining of a peer.
- * @param test_cb Function multicast can use to test group membership.
- * @param replay_frag_cb Function that can be called to replay message fragments
+ * @param join_msg
+ * Application-dependent join message to be passed to the peer @a origin.
+ * @param join_request_cb
+ * Function called to approve / disapprove joining of a peer.
+ * @param join_decision_cb
+ * Function called to inform about the join decision.
+ * @param replay_frag_cb
+ * Function that can be called to replay message fragments
* this peer already knows from this group. NULL if this
* client is unable to support replay.
- * @param replay_msg_cb Function that can be called to replay message fragments
+ * @param replay_msg_cb
+ * Function that can be called to replay message fragments
* this peer already knows from this group. NULL if this
* client is unable to support replay.
- * @param message_cb Function to be called for all message fragments we
+ * @param message_cb
+ * Function to be called for all message fragments we
* receive from the group, excluding those our @a replay_cb
* already has.
- * @param cls Closure for callbacks.
+ * @param cls
+ * Closure for callbacks.
+ *
* @return Handle for the member, NULL on error.
*/
struct GNUNET_MULTICAST_Member *
GNUNET_MULTICAST_member_join (const struct GNUNET_CONFIGURATION_Handle *cfg,
- const struct GNUNET_CRYPTO_EccPublicSignKey *group_key,
- const struct GNUNET_CRYPTO_EccPrivateKey *member_key,
+ const struct GNUNET_CRYPTO_EddsaPublicKey *group_pub_key,
+ const struct GNUNET_CRYPTO_EcdsaPrivateKey *member_key,
const struct GNUNET_PeerIdentity *origin,
- uint32_t relay_count,
+ uint16_t relay_count,
const struct GNUNET_PeerIdentity *relays,
- const struct GNUNET_MessageHeader *join_request,
- GNUNET_MULTICAST_JoinCallback join_cb,
- GNUNET_MULTICAST_MembershipTestCallback test_cb,
+ const struct GNUNET_MessageHeader *join_msg,
+ GNUNET_MULTICAST_JoinRequestCallback join_request_cb,
+ GNUNET_MULTICAST_JoinDecisionCallback join_decision_cb,
GNUNET_MULTICAST_ReplayFragmentCallback replay_frag_cb,
GNUNET_MULTICAST_ReplayMessageCallback replay_msg_cb,
GNUNET_MULTICAST_MessageCallback message_cb,
void *cls)
{
- return NULL;
+ struct GNUNET_MULTICAST_Member *mem = GNUNET_malloc (sizeof (*mem));
+ struct GNUNET_MULTICAST_Group *grp = &mem->grp;
+
+ uint16_t relay_size = relay_count * sizeof (*relays);
+ uint16_t join_msg_size = (NULL != join_msg) ? ntohs (join_msg->size) : 0;
+ struct MulticastMemberJoinMessage *join;
+ grp->connect_env = GNUNET_MQ_msg_extra (join, relay_size + join_msg_size,
+ GNUNET_MESSAGE_TYPE_MULTICAST_MEMBER_JOIN);
+ join->group_pub_key = *group_pub_key;
+ join->member_key = *member_key;
+ join->origin = *origin;
+ join->relay_count = ntohl (relay_count);
+ if (0 < relay_size)
+ GNUNET_memcpy (&join[1], relays, relay_size);
+ if (0 < join_msg_size)
+ GNUNET_memcpy (((char *) &join[1]) + relay_size, join_msg, join_msg_size);
+
+ grp->cfg = cfg;
+ grp->is_origin = GNUNET_NO;
+ grp->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
+
+ mem->join_dcsn_cb = join_decision_cb;
+ grp->join_req_cb = join_request_cb;
+ grp->replay_frag_cb = replay_frag_cb;
+ grp->replay_msg_cb = replay_msg_cb;
+ grp->message_cb = message_cb;
+ grp->cb_cls = cls;
+
+ member_connect (mem);
+ return mem;
}
-/**
- * Handle for a replay request.
+/**
+ * Part a multicast group.
+ *
+ * Disconnects from all group members and invalidates the @a member handle.
+ *
+ * An application-dependent part message can be transmitted beforehand using
+ * #GNUNET_MULTICAST_member_to_origin())
+ *
+ * @param member
+ * Membership handle.
*/
-struct GNUNET_MULTICAST_MemberReplayHandle
+void
+GNUNET_MULTICAST_member_part (struct GNUNET_MULTICAST_Member *mem,
+ GNUNET_ContinuationCallback part_cb,
+ void *part_cls)
{
-};
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%p Member parting.\n", mem);
+ struct GNUNET_MULTICAST_Group *grp = &mem->grp;
+
+ mem->join_dcsn_cb = NULL;
+ grp->join_req_cb = NULL;
+ grp->message_cb = NULL;
+ grp->replay_msg_cb = NULL;
+ grp->replay_frag_cb = NULL;
+
+ group_disconnect (grp, part_cb, part_cls);
+}
-/**
+void
+member_replay_request (struct GNUNET_MULTICAST_Member *mem,
+ uint64_t fragment_id,
+ uint64_t message_id,
+ uint64_t fragment_offset,
+ uint64_t flags)
+{
+ struct MulticastReplayRequestMessage *rep;
+ struct GNUNET_MQ_Envelope *
+ env = GNUNET_MQ_msg (rep, GNUNET_MESSAGE_TYPE_MULTICAST_REPLAY_REQUEST);
+
+ rep->fragment_id = GNUNET_htonll (fragment_id);
+ rep->message_id = GNUNET_htonll (message_id);
+ rep->fragment_offset = GNUNET_htonll (fragment_offset);
+ rep->flags = GNUNET_htonll (flags);
+
+ GNUNET_MQ_send (mem->grp.mq, env);
+}
+
+
+/**
* Request a fragment to be replayed by fragment ID.
*
* Useful if messages below the @e max_known_fragment_id given when joining are
* needed and not known to the client.
*
- * @param member Membership handle.
- * @param fragment_id ID of a message fragment that this client would like to
- see replayed.
- * @param flags Additional flags for the replay request. It is used and defined
- * by the replay callback. FIXME: which replay callback? FIXME: use enum?
- * FIXME: why not pass reply cb here?
- * @return Replay request handle, NULL on error.
+ * @param member
+ * Membership handle.
+ * @param fragment_id
+ * ID of a message fragment that this client would like to see replayed.
+ * @param flags
+ * Additional flags for the replay request.
+ * It is used and defined by GNUNET_MULTICAST_ReplayFragmentCallback
+ *
+ * @return Replay request handle.
*/
struct GNUNET_MULTICAST_MemberReplayHandle *
-GNUNET_MULTICAST_member_replay_fragment (struct GNUNET_MULTICAST_Member *member,
+GNUNET_MULTICAST_member_replay_fragment (struct GNUNET_MULTICAST_Member *mem,
uint64_t fragment_id,
uint64_t flags)
{
+ member_replay_request (mem, fragment_id, 0, 0, flags);
+ // FIXME: return something useful
return NULL;
}
-/**
+/**
* Request a message fragment to be replayed.
*
* Useful if messages below the @e max_known_fragment_id given when joining are
* needed and not known to the client.
*
- * @param member Membership handle.
- * @param message_id ID of the message this client would like to see replayed.
- * @param fragment_offset Offset of the fragment within the message to replay.
- * @param flags Additional flags for the replay request. It is used & defined
- * by the replay callback.
- * @param result_cb Function to be called for the replayed message.
- * @param result_cb_cls Closure for @a result_cb.
+ * @param member
+ * Membership handle.
+ * @param message_id
+ * ID of the message this client would like to see replayed.
+ * @param fragment_offset
+ * Offset of the fragment within the message to replay.
+ * @param flags
+ * Additional flags for the replay request.
+ * It is used & defined by GNUNET_MULTICAST_ReplayMessageCallback
+ *
* @return Replay request handle, NULL on error.
*/
struct GNUNET_MULTICAST_MemberReplayHandle *
-GNUNET_MULTICAST_member_replay_message (struct GNUNET_MULTICAST_Member *member,
+GNUNET_MULTICAST_member_replay_message (struct GNUNET_MULTICAST_Member *mem,
uint64_t message_id,
uint64_t fragment_offset,
- uint64_t flags,
- GNUNET_MULTICAST_ResultCallback result_cb,
- void *result_cb_cls)
+ uint64_t flags)
{
+ member_replay_request (mem, 0, message_id, fragment_offset, flags);
+ // FIXME: return something useful
return NULL;
}
-/**
- * Cancel a replay request.
- *
- * @param rh Request to cancel.
- */
-void
-GNUNET_MULTICAST_member_replay_cancel (struct GNUNET_MULTICAST_MemberReplayHandle *rh)
+static void
+member_to_origin (struct GNUNET_MULTICAST_Member *mem)
{
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "member_to_origin()\n");
+ struct GNUNET_MULTICAST_Group *grp = &mem->grp;
+ struct GNUNET_MULTICAST_MemberTransmitHandle *tmit = &mem->tmit;
+ GNUNET_assert (GNUNET_YES == grp->in_transmit);
+
+ size_t buf_size = GNUNET_MULTICAST_FRAGMENT_MAX_SIZE;
+ struct GNUNET_MULTICAST_RequestHeader *req;
+ struct GNUNET_MQ_Envelope *
+ env = GNUNET_MQ_msg_extra (req, buf_size - sizeof(*req),
+ GNUNET_MESSAGE_TYPE_MULTICAST_REQUEST);
+
+ int ret = tmit->notify (tmit->notify_cls, &buf_size, &req[1]);
+
+ if (! (GNUNET_YES == ret || GNUNET_NO == ret)
+ || GNUNET_MULTICAST_FRAGMENT_MAX_SIZE < buf_size)
+ {
+ LOG (GNUNET_ERROR_TYPE_ERROR,
+ "MemberTransmitNotify() returned error or invalid message size. "
+ "ret=%d, buf_size=%u\n", ret, buf_size);
+ /* FIXME: handle error */
+ GNUNET_MQ_discard (env);
+ return;
+ }
+
+ if (GNUNET_NO == ret && 0 == buf_size)
+ {
+ /* Transmission paused. */
+ GNUNET_MQ_discard (env);
+ return;
+ }
+
+ req->header.size = htons (sizeof (*req) + buf_size);
+ req->request_id = GNUNET_htonll (tmit->request_id);
+ req->fragment_offset = GNUNET_ntohll (tmit->fragment_offset);
+ tmit->fragment_offset += sizeof (*req) + buf_size;
+
+ GNUNET_MQ_send (grp->mq, env);
+
+ if (GNUNET_YES == ret)
+ grp->in_transmit = GNUNET_NO;
}
-/**
- * Part a multicast group.
- *
- * Disconnects from all group members and invalidates the @a member handle.
+/**
+ * Send a message to the origin of the multicast group.
*
- * An application-dependent part message can be transmitted beforehand using
- * #GNUNET_MULTICAST_member_to_origin())
+ * @param mem
+ * Membership handle.
+ * @param request_id
+ * Application layer ID for the request. Opaque to multicast.
+ * @param notify
+ * Callback to call to get the message.
+ * @param notify_cls
+ * Closure for @a notify.
*
- * @param member Membership handle.
+ * @return Handle to cancel request, NULL on error (i.e. request already pending).
*/
-void
-GNUNET_MULTICAST_member_part (struct GNUNET_MULTICAST_Member *member)
+struct GNUNET_MULTICAST_MemberTransmitHandle *
+GNUNET_MULTICAST_member_to_origin (struct GNUNET_MULTICAST_Member *mem,
+ uint64_t request_id,
+ GNUNET_MULTICAST_MemberTransmitNotify notify,
+ void *notify_cls)
{
+ if (GNUNET_YES == mem->grp.in_transmit)
+ return NULL;
+ mem->grp.in_transmit = GNUNET_YES;
+
+ struct GNUNET_MULTICAST_MemberTransmitHandle *tmit = &mem->tmit;
+ tmit->member = mem;
+ tmit->request_id = request_id;
+ tmit->fragment_offset = 0;
+ tmit->notify = notify;
+ tmit->notify_cls = notify_cls;
+
+ member_to_origin (mem);
+ return tmit;
}
-/**
- * Handle for a message to be delivered from a member to the origin.
- */
-struct GNUNET_MULTICAST_MemberRequestHandle
-{
-};
-
-
-/**
- * Send a message to the origin of the multicast group.
- *
- * @param member Membership handle.
- * @param message_id Application layer ID for the message. Opaque to multicast.
- * @param size Number of bytes we want to send to origin.
- * @param notify Callback to call to get the message.
- * @param notify_cls Closure for @a notify.
- * @return Handle to cancel request, NULL on error (i.e. request already pending).
+/**
+ * Resume message transmission to origin.
+ *
+ * @param th
+ * Transmission to cancel.
*/
-struct GNUNET_MULTICAST_MemberRequestHandle *
-GNUNET_MULTICAST_member_to_origin (struct GNUNET_MULTICAST_Member *member,
- uint64_t message_id,
- size_t size,
- GNUNET_MULTICAST_MemberTransmitNotify notify,
- void *notify_cls)
+void
+GNUNET_MULTICAST_member_to_origin_resume (struct GNUNET_MULTICAST_MemberTransmitHandle *th)
{
- return NULL;
+ struct GNUNET_MULTICAST_Group *grp = &th->member->grp;
+ if (0 != grp->acks_pending || GNUNET_YES != grp->in_transmit)
+ return;
+ member_to_origin (th->member);
}
-/**
+/**
* Cancel request for message transmission to origin.
*
- * @param rh Request to cancel.
+ * @param th
+ * Transmission to cancel.
*/
void
-GNUNET_MULTICAST_member_to_origin_cancel (struct GNUNET_MULTICAST_MemberRequestHandle *rh)
+GNUNET_MULTICAST_member_to_origin_cancel (struct GNUNET_MULTICAST_MemberTransmitHandle *th)
{
+ th->member->grp.in_transmit = GNUNET_NO;
}
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