2 This file is part of GNUnet.
3 (C) 2012 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
23 * Checks for matching the sender and socket->other_peer in server
26 * Add code for write io timeout
28 * Include retransmission for control messages
32 * @file stream/stream_api.c
33 * @brief Implementation of the stream library
34 * @author Sree Harsha Totakura
39 #include "gnunet_common.h"
40 #include "gnunet_crypto_lib.h"
41 #include "gnunet_lockmanager_service.h"
42 #include "gnunet_stream_lib.h"
43 #include "stream_protocol.h"
45 #define LOG(kind,...) \
46 GNUNET_log_from (kind, "stream-api", __VA_ARGS__)
48 #define TIME_REL_SECS(sec) \
49 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, sec)
52 * The maximum packet size of a stream packet
54 #define MAX_PACKET_SIZE 512//64000
59 #define RECEIVE_BUFFER_SIZE 4096000
62 * The maximum payload a data message packet can carry
64 static const size_t max_payload_size =
65 MAX_PACKET_SIZE - sizeof (struct GNUNET_STREAM_DataMessage);
68 * states in the Protocol
73 * Client initialization state
78 * Listener initialization state
83 * Pre-connection establishment state
88 * State where a connection has been established
93 * State where the socket is closed on our side and waiting to be ACK'ed
95 STATE_RECEIVE_CLOSE_WAIT,
98 * State where the socket is closed for reading
100 STATE_RECEIVE_CLOSED,
103 * State where the socket is closed on our side and waiting to be ACK'ed
105 STATE_TRANSMIT_CLOSE_WAIT,
108 * State where the socket is closed for writing
110 STATE_TRANSMIT_CLOSED,
113 * State where the socket is closed on our side and waiting to be ACK'ed
118 * State where the socket is closed
125 * Functions of this type are called when a message is written
127 * @param cls the closure from queue_message
128 * @param socket the socket the written message was bound to
130 typedef void (*SendFinishCallback) (void *cls,
131 struct GNUNET_STREAM_Socket *socket);
135 * The send message queue
142 struct GNUNET_STREAM_MessageHeader *message;
145 * Callback to be called when the message is sent
147 SendFinishCallback finish_cb;
150 * The closure for finish_cb
155 * The next message in queue. Should be NULL in the last message
157 struct MessageQueue *next;
160 * The next message in queue. Should be NULL in the first message
162 struct MessageQueue *prev;
167 * The STREAM Socket Handler
169 struct GNUNET_STREAM_Socket
172 * Retransmission timeout
174 struct GNUNET_TIME_Relative retransmit_timeout;
177 * The Acknowledgement Bitmap
179 GNUNET_STREAM_AckBitmap ack_bitmap;
182 * Time when the Acknowledgement was queued
184 struct GNUNET_TIME_Absolute ack_time_registered;
187 * Queued Acknowledgement deadline
189 struct GNUNET_TIME_Relative ack_time_deadline;
194 struct GNUNET_MESH_Handle *mesh;
197 * The mesh tunnel handle
199 struct GNUNET_MESH_Tunnel *tunnel;
202 * Stream open closure
207 * Stream open callback
209 GNUNET_STREAM_OpenCallback open_cb;
212 * The current transmit handle (if a pending transmit request exists)
214 struct GNUNET_MESH_TransmitHandle *transmit_handle;
217 * The current act transmit handle (if a pending ack transmit request exists)
219 struct GNUNET_MESH_TransmitHandle *ack_transmit_handle;
222 * Pointer to the current ack message using in ack_task
224 struct GNUNET_STREAM_AckMessage *ack_msg;
227 * The current message associated with the transmit handle
229 struct MessageQueue *queue_head;
232 * The queue tail, should always point to the last message in queue
234 struct MessageQueue *queue_tail;
237 * The write IO_handle associated with this socket
239 struct GNUNET_STREAM_IOWriteHandle *write_handle;
242 * The read IO_handle associated with this socket
244 struct GNUNET_STREAM_IOReadHandle *read_handle;
247 * The shutdown handle associated with this socket
249 struct GNUNET_STREAM_ShutdownHandle *shutdown_handle;
252 * Buffer for storing received messages
254 void *receive_buffer;
257 * The listen socket from which this socket is derived. Should be NULL if it
258 * is not a derived socket
260 struct GNUNET_STREAM_ListenSocket *lsocket;
263 * The peer identity of the peer at the other end of the stream
265 struct GNUNET_PeerIdentity other_peer;
268 * Task identifier for the read io timeout task
270 GNUNET_SCHEDULER_TaskIdentifier read_io_timeout_task_id;
273 * Task identifier for retransmission task after timeout
275 GNUNET_SCHEDULER_TaskIdentifier retransmission_timeout_task_id;
278 * The task for sending timely Acks
280 GNUNET_SCHEDULER_TaskIdentifier ack_task_id;
283 * Task scheduled to continue a read operation.
285 GNUNET_SCHEDULER_TaskIdentifier read_task_id;
288 * The state of the protocol associated with this socket
293 * The status of the socket
295 enum GNUNET_STREAM_Status status;
298 * The number of previous timeouts; FIXME: currently not used
300 unsigned int retries;
303 * The application port number (type: uint32_t)
305 GNUNET_MESH_ApplicationType app_port;
308 * Whether testing mode is active or not
313 * The write sequence number to be set incase of testing
315 uint32_t testing_set_write_sequence_number_value;
318 * The session id associated with this stream connection
319 * FIXME: Not used currently, may be removed
324 * Write sequence number. Set to random when sending HELLO(client) and
327 uint32_t write_sequence_number;
330 * Read sequence number. This number's value is determined during handshake
332 uint32_t read_sequence_number;
335 * The receiver buffer size
337 uint32_t receive_buffer_size;
340 * The receiver buffer boundaries
342 uint32_t receive_buffer_boundaries[GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH];
345 * receiver's available buffer after the last acknowledged packet
347 uint32_t receiver_window_available;
350 * The offset pointer used during write operation
352 uint32_t write_offset;
355 * The offset after which we are expecting data
357 uint32_t read_offset;
360 * The offset upto which user has read from the received buffer
362 uint32_t copy_offset;
367 * A socket for listening
369 struct GNUNET_STREAM_ListenSocket
374 struct GNUNET_MESH_Handle *mesh;
379 struct GNUNET_CONFIGURATION_Handle *cfg;
382 * Handle to the lock manager service
384 struct GNUNET_LOCKMANAGER_Handle *lockmanager;
387 * The active LockingRequest from lockmanager
389 struct GNUNET_LOCKMANAGER_LockingRequest *locking_request;
392 * The callback function which is called after successful opening socket
394 GNUNET_STREAM_ListenCallback listen_cb;
397 * The call back closure
404 GNUNET_MESH_ApplicationType port;
407 * The id of the lockmanager timeout task
409 GNUNET_SCHEDULER_TaskIdentifier lockmanager_acquire_timeout_task;
412 * The retransmit timeout
414 struct GNUNET_TIME_Relative retransmit_timeout;
422 * Whether testing mode is active or not
427 * The write sequence number to be set incase of testing
429 uint32_t testing_set_write_sequence_number_value;
434 * The IO Write Handle
436 struct GNUNET_STREAM_IOWriteHandle
439 * The socket to which this write handle is associated
441 struct GNUNET_STREAM_Socket *socket;
444 * The packet_buffers associated with this Handle
446 struct GNUNET_STREAM_DataMessage *messages[GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH];
449 * The write continuation callback
451 GNUNET_STREAM_CompletionContinuation write_cont;
454 * Write continuation closure
456 void *write_cont_cls;
459 * The bitmap of this IOHandle; Corresponding bit for a message is set when
460 * it has been acknowledged by the receiver
462 GNUNET_STREAM_AckBitmap ack_bitmap;
465 * Number of bytes in this write handle
474 struct GNUNET_STREAM_IOReadHandle
477 * Callback for the read processor
479 GNUNET_STREAM_DataProcessor proc;
482 * The closure pointer for the read processor callback
489 * Handle for Shutdown
491 struct GNUNET_STREAM_ShutdownHandle
494 * The socket associated with this shutdown handle
496 struct GNUNET_STREAM_Socket *socket;
499 * Shutdown completion callback
501 GNUNET_STREAM_ShutdownCompletion completion_cb;
504 * Closure for completion callback
506 void *completion_cls;
509 * Close message retransmission task id
511 GNUNET_SCHEDULER_TaskIdentifier close_msg_retransmission_task_id;
514 * Which operation to shutdown? SHUT_RD, SHUT_WR or SHUT_RDWR
521 * Default value in seconds for various timeouts
523 static const unsigned int default_timeout = 10;
526 * The domain name for locks we use here
528 static const char *locking_domain = "GNUNET_STREAM_APPLOCK";
532 * Callback function for sending queued message
534 * @param cls closure the socket
535 * @param size number of bytes available in buf
536 * @param buf where the callee should write the message
537 * @return number of bytes written to buf
540 send_message_notify (void *cls, size_t size, void *buf)
542 struct GNUNET_STREAM_Socket *socket = cls;
543 struct MessageQueue *head;
546 socket->transmit_handle = NULL; /* Remove the transmit handle */
547 head = socket->queue_head;
549 return 0; /* just to be safe */
550 if (0 == size) /* request timed out */
553 LOG (GNUNET_ERROR_TYPE_DEBUG,
554 "%s: Message sending timed out. Retry %d \n",
555 GNUNET_i2s (&socket->other_peer),
557 socket->transmit_handle =
558 GNUNET_MESH_notify_transmit_ready (socket->tunnel,
561 /* FIXME: exponential backoff */
562 socket->retransmit_timeout,
564 ntohs (head->message->header.size),
565 &send_message_notify,
570 ret = ntohs (head->message->header.size);
571 GNUNET_assert (size >= ret);
572 memcpy (buf, head->message, ret);
573 if (NULL != head->finish_cb)
575 head->finish_cb (head->finish_cb_cls, socket);
577 GNUNET_CONTAINER_DLL_remove (socket->queue_head,
580 GNUNET_free (head->message);
582 head = socket->queue_head;
583 if (NULL != head) /* more pending messages to send */
586 socket->transmit_handle =
587 GNUNET_MESH_notify_transmit_ready (socket->tunnel,
590 /* FIXME: exponential backoff */
591 socket->retransmit_timeout,
593 ntohs (head->message->header.size),
594 &send_message_notify,
602 * Queues a message for sending using the mesh connection of a socket
604 * @param socket the socket whose mesh connection is used
605 * @param message the message to be sent
606 * @param finish_cb the callback to be called when the message is sent
607 * @param finish_cb_cls the closure for the callback
610 queue_message (struct GNUNET_STREAM_Socket *socket,
611 struct GNUNET_STREAM_MessageHeader *message,
612 SendFinishCallback finish_cb,
615 struct MessageQueue *queue_entity;
618 ((ntohs (message->header.type) >= GNUNET_MESSAGE_TYPE_STREAM_DATA)
619 && (ntohs (message->header.type) <= GNUNET_MESSAGE_TYPE_STREAM_CLOSE_ACK));
621 LOG (GNUNET_ERROR_TYPE_DEBUG,
622 "%s: Queueing message of type %d and size %d\n",
623 GNUNET_i2s (&socket->other_peer),
624 ntohs (message->header.type),
625 ntohs (message->header.size));
626 GNUNET_assert (NULL != message);
627 queue_entity = GNUNET_malloc (sizeof (struct MessageQueue));
628 queue_entity->message = message;
629 queue_entity->finish_cb = finish_cb;
630 queue_entity->finish_cb_cls = finish_cb_cls;
631 GNUNET_CONTAINER_DLL_insert_tail (socket->queue_head,
634 if (NULL == socket->transmit_handle)
637 socket->transmit_handle =
638 GNUNET_MESH_notify_transmit_ready (socket->tunnel,
641 socket->retransmit_timeout,
643 ntohs (message->header.size),
644 &send_message_notify,
651 * Copies a message and queues it for sending using the mesh connection of
654 * @param socket the socket whose mesh connection is used
655 * @param message the message to be sent
656 * @param finish_cb the callback to be called when the message is sent
657 * @param finish_cb_cls the closure for the callback
660 copy_and_queue_message (struct GNUNET_STREAM_Socket *socket,
661 const struct GNUNET_STREAM_MessageHeader *message,
662 SendFinishCallback finish_cb,
665 struct GNUNET_STREAM_MessageHeader *msg_copy;
668 size = ntohs (message->header.size);
669 msg_copy = GNUNET_malloc (size);
670 memcpy (msg_copy, message, size);
671 queue_message (socket, msg_copy, finish_cb, finish_cb_cls);
676 * Callback function for sending ack message
678 * @param cls closure the ACK message created in ack_task
679 * @param size number of bytes available in buffer
680 * @param buf where the callee should write the message
681 * @return number of bytes written to buf
684 send_ack_notify (void *cls, size_t size, void *buf)
686 struct GNUNET_STREAM_Socket *socket = cls;
690 LOG (GNUNET_ERROR_TYPE_DEBUG,
691 "%s called with size 0\n", __func__);
694 GNUNET_assert (ntohs (socket->ack_msg->header.header.size) <= size);
696 size = ntohs (socket->ack_msg->header.header.size);
697 memcpy (buf, socket->ack_msg, size);
699 GNUNET_free (socket->ack_msg);
700 socket->ack_msg = NULL;
701 socket->ack_transmit_handle = NULL;
706 * Writes data using the given socket. The amount of data written is limited by
707 * the receiver_window_size
709 * @param socket the socket to use
712 write_data (struct GNUNET_STREAM_Socket *socket);
715 * Task for retransmitting data messages if they aren't ACK before their ack
718 * @param cls the socket
719 * @param tc the Task context
722 retransmission_timeout_task (void *cls,
723 const struct GNUNET_SCHEDULER_TaskContext *tc)
725 struct GNUNET_STREAM_Socket *socket = cls;
727 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
730 LOG (GNUNET_ERROR_TYPE_DEBUG,
731 "%s: Retransmitting DATA...\n", GNUNET_i2s (&socket->other_peer));
732 socket->retransmission_timeout_task_id = GNUNET_SCHEDULER_NO_TASK;
738 * Task for sending ACK message
740 * @param cls the socket
741 * @param tc the Task context
745 const struct GNUNET_SCHEDULER_TaskContext *tc)
747 struct GNUNET_STREAM_Socket *socket = cls;
748 struct GNUNET_STREAM_AckMessage *ack_msg;
750 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
754 socket->ack_task_id = GNUNET_SCHEDULER_NO_TASK;
755 /* Create the ACK Message */
756 ack_msg = GNUNET_malloc (sizeof (struct GNUNET_STREAM_AckMessage));
757 ack_msg->header.header.size = htons (sizeof (struct
758 GNUNET_STREAM_AckMessage));
759 ack_msg->header.header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_ACK);
760 ack_msg->bitmap = GNUNET_htonll (socket->ack_bitmap);
761 ack_msg->base_sequence_number = htonl (socket->read_sequence_number);
762 ack_msg->receive_window_remaining =
763 htonl (RECEIVE_BUFFER_SIZE - socket->receive_buffer_size);
764 socket->ack_msg = ack_msg;
765 /* Request MESH for sending ACK */
766 socket->ack_transmit_handle =
767 GNUNET_MESH_notify_transmit_ready (socket->tunnel,
770 socket->retransmit_timeout,
772 ntohs (ack_msg->header.header.size),
779 * Retransmission task for shutdown messages
781 * @param cls the shutdown handle
782 * @param tc the Task Context
785 close_msg_retransmission_task (void *cls,
786 const struct GNUNET_SCHEDULER_TaskContext *tc)
788 struct GNUNET_STREAM_ShutdownHandle *shutdown_handle = cls;
789 struct GNUNET_STREAM_MessageHeader *msg;
790 struct GNUNET_STREAM_Socket *socket;
792 GNUNET_assert (NULL != shutdown_handle);
793 socket = shutdown_handle->socket;
795 msg = GNUNET_malloc (sizeof (struct GNUNET_STREAM_MessageHeader));
796 msg->header.size = htons (sizeof (struct GNUNET_STREAM_MessageHeader));
797 switch (shutdown_handle->operation)
800 msg->header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_CLOSE);
803 msg->header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE);
806 msg->header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE);
810 shutdown_handle->close_msg_retransmission_task_id =
811 GNUNET_SCHEDULER_NO_TASK;
814 queue_message (socket, msg, NULL, NULL);
815 shutdown_handle->close_msg_retransmission_task_id =
816 GNUNET_SCHEDULER_add_delayed (socket->retransmit_timeout,
817 &close_msg_retransmission_task,
823 * Function to modify a bit in GNUNET_STREAM_AckBitmap
825 * @param bitmap the bitmap to modify
826 * @param bit the bit number to modify
827 * @param value GNUNET_YES to on, GNUNET_NO to off
830 ackbitmap_modify_bit (GNUNET_STREAM_AckBitmap *bitmap,
834 GNUNET_assert (bit < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH);
835 if (GNUNET_YES == value)
836 *bitmap |= (1LL << bit);
838 *bitmap &= ~(1LL << bit);
843 * Function to check if a bit is set in the GNUNET_STREAM_AckBitmap
845 * @param bitmap address of the bitmap that has to be checked
846 * @param bit the bit number to check
847 * @return GNUNET_YES if the bit is set; GNUNET_NO if not
850 ackbitmap_is_bit_set (const GNUNET_STREAM_AckBitmap *bitmap,
853 GNUNET_assert (bit < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH);
854 return 0 != (*bitmap & (1LL << bit));
859 * Writes data using the given socket. The amount of data written is limited by
860 * the receiver_window_size
862 * @param socket the socket to use
865 write_data (struct GNUNET_STREAM_Socket *socket)
867 struct GNUNET_STREAM_IOWriteHandle *io_handle = socket->write_handle;
868 int packet; /* Although an int, should never be negative */
872 /* Find the last acknowledged packet */
873 for (packet=0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
875 if (GNUNET_YES == ackbitmap_is_bit_set (&io_handle->ack_bitmap,
878 else if (NULL == io_handle->messages[packet])
881 /* Resend packets which weren't ack'ed */
882 for (packet=0; packet < ack_packet; packet++)
884 if (GNUNET_NO == ackbitmap_is_bit_set (&io_handle->ack_bitmap,
887 LOG (GNUNET_ERROR_TYPE_DEBUG,
888 "%s: Placing DATA message with sequence %u in send queue\n",
889 GNUNET_i2s (&socket->other_peer),
890 ntohl (io_handle->messages[packet]->sequence_number));
891 copy_and_queue_message (socket,
892 &io_handle->messages[packet]->header,
897 packet = ack_packet + 1;
898 /* Now send new packets if there is enough buffer space */
899 while ( (NULL != io_handle->messages[packet]) &&
900 (socket->receiver_window_available
901 >= ntohs (io_handle->messages[packet]->header.header.size)) &&
902 (packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH))
904 socket->receiver_window_available -=
905 ntohs (io_handle->messages[packet]->header.header.size);
906 LOG (GNUNET_ERROR_TYPE_DEBUG,
907 "%s: Placing DATA message with sequence %u in send queue\n",
908 GNUNET_i2s (&socket->other_peer),
909 ntohl (io_handle->messages[packet]->sequence_number));
910 copy_and_queue_message (socket,
911 &io_handle->messages[packet]->header,
916 if (GNUNET_SCHEDULER_NO_TASK == socket->retransmission_timeout_task_id)
917 socket->retransmission_timeout_task_id =
918 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
919 (GNUNET_TIME_UNIT_SECONDS, 8),
920 &retransmission_timeout_task,
926 * Task for calling the read processor
928 * @param cls the socket
929 * @param tc the task context
932 call_read_processor (void *cls,
933 const struct GNUNET_SCHEDULER_TaskContext *tc)
935 struct GNUNET_STREAM_Socket *socket = cls;
937 size_t valid_read_size;
939 uint32_t sequence_increase;
940 uint32_t offset_increase;
942 socket->read_task_id = GNUNET_SCHEDULER_NO_TASK;
943 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
946 if (NULL == socket->receive_buffer)
949 GNUNET_assert (NULL != socket->read_handle);
950 GNUNET_assert (NULL != socket->read_handle->proc);
952 /* Check the bitmap for any holes */
953 for (packet=0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
955 if (GNUNET_NO == ackbitmap_is_bit_set (&socket->ack_bitmap,
959 /* We only call read processor if we have the first packet */
960 GNUNET_assert (0 < packet);
962 socket->receive_buffer_boundaries[packet-1] - socket->copy_offset;
963 GNUNET_assert (0 != valid_read_size);
964 /* Cancel the read_io_timeout_task */
965 GNUNET_SCHEDULER_cancel (socket->read_io_timeout_task_id);
966 socket->read_io_timeout_task_id = GNUNET_SCHEDULER_NO_TASK;
967 /* Call the data processor */
968 LOG (GNUNET_ERROR_TYPE_DEBUG,
969 "%s: Calling read processor\n",
970 GNUNET_i2s (&socket->other_peer));
972 socket->read_handle->proc (socket->read_handle->proc_cls,
974 socket->receive_buffer + socket->copy_offset,
976 LOG (GNUNET_ERROR_TYPE_DEBUG,
977 "%s: Read processor read %d bytes\n",
978 GNUNET_i2s (&socket->other_peer), read_size);
979 LOG (GNUNET_ERROR_TYPE_DEBUG,
980 "%s: Read processor completed successfully\n",
981 GNUNET_i2s (&socket->other_peer));
982 /* Free the read handle */
983 GNUNET_free (socket->read_handle);
984 socket->read_handle = NULL;
985 GNUNET_assert (read_size <= valid_read_size);
986 socket->copy_offset += read_size;
987 /* Determine upto which packet we can remove from the buffer */
988 for (packet = 0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
990 if (socket->copy_offset == socket->receive_buffer_boundaries[packet])
992 if (socket->copy_offset < socket->receive_buffer_boundaries[packet])
996 /* If no packets can be removed we can't move the buffer */
997 if (0 == packet) return;
998 sequence_increase = packet;
999 LOG (GNUNET_ERROR_TYPE_DEBUG,
1000 "%s: Sequence increase after read processor completion: %u\n",
1001 GNUNET_i2s (&socket->other_peer), sequence_increase);
1003 /* Shift the data in the receive buffer */
1004 socket->receive_buffer =
1005 memmove (socket->receive_buffer,
1006 socket->receive_buffer
1007 + socket->receive_buffer_boundaries[sequence_increase-1],
1008 socket->receive_buffer_size
1009 - socket->receive_buffer_boundaries[sequence_increase-1]);
1010 /* Shift the bitmap */
1011 socket->ack_bitmap = socket->ack_bitmap >> sequence_increase;
1012 /* Set read_sequence_number */
1013 socket->read_sequence_number += sequence_increase;
1014 /* Set read_offset */
1015 offset_increase = socket->receive_buffer_boundaries[sequence_increase-1];
1016 socket->read_offset += offset_increase;
1017 /* Fix copy_offset */
1018 GNUNET_assert (offset_increase <= socket->copy_offset);
1019 socket->copy_offset -= offset_increase;
1020 /* Fix relative boundaries */
1021 for (packet=0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
1023 if (packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH - sequence_increase)
1025 uint32_t ahead_buffer_boundary;
1027 ahead_buffer_boundary =
1028 socket->receive_buffer_boundaries[packet + sequence_increase];
1029 if (0 == ahead_buffer_boundary)
1030 socket->receive_buffer_boundaries[packet] = 0;
1033 GNUNET_assert (offset_increase < ahead_buffer_boundary);
1034 socket->receive_buffer_boundaries[packet] =
1035 ahead_buffer_boundary - offset_increase;
1039 socket->receive_buffer_boundaries[packet] = 0;
1045 * Cancels the existing read io handle
1047 * @param cls the closure from the SCHEDULER call
1048 * @param tc the task context
1051 read_io_timeout (void *cls,
1052 const struct GNUNET_SCHEDULER_TaskContext *tc)
1054 struct GNUNET_STREAM_Socket *socket = cls;
1055 GNUNET_STREAM_DataProcessor proc;
1058 socket->read_io_timeout_task_id = GNUNET_SCHEDULER_NO_TASK;
1059 if (socket->read_task_id != GNUNET_SCHEDULER_NO_TASK)
1061 LOG (GNUNET_ERROR_TYPE_DEBUG,
1062 "%s: Read task timedout - Cancelling it\n",
1063 GNUNET_i2s (&socket->other_peer));
1064 GNUNET_SCHEDULER_cancel (socket->read_task_id);
1065 socket->read_task_id = GNUNET_SCHEDULER_NO_TASK;
1067 GNUNET_assert (NULL != socket->read_handle);
1068 proc = socket->read_handle->proc;
1069 proc_cls = socket->read_handle->proc_cls;
1071 GNUNET_free (socket->read_handle);
1072 socket->read_handle = NULL;
1073 /* Call the read processor to signal timeout */
1075 GNUNET_STREAM_TIMEOUT,
1082 * Handler for DATA messages; Same for both client and server
1084 * @param socket the socket through which the ack was received
1085 * @param tunnel connection to the other end
1086 * @param sender who sent the message
1087 * @param msg the data message
1088 * @param atsi performance data for the connection
1089 * @return GNUNET_OK to keep the connection open,
1090 * GNUNET_SYSERR to close it (signal serious error)
1093 handle_data (struct GNUNET_STREAM_Socket *socket,
1094 struct GNUNET_MESH_Tunnel *tunnel,
1095 const struct GNUNET_PeerIdentity *sender,
1096 const struct GNUNET_STREAM_DataMessage *msg,
1097 const struct GNUNET_ATS_Information*atsi)
1099 const void *payload;
1100 uint32_t bytes_needed;
1101 uint32_t relative_offset;
1102 uint32_t relative_sequence_number;
1105 size = htons (msg->header.header.size);
1106 if (size < sizeof (struct GNUNET_STREAM_DataMessage))
1108 GNUNET_break_op (0);
1109 return GNUNET_SYSERR;
1112 if (0 != memcmp (sender,
1113 &socket->other_peer,
1114 sizeof (struct GNUNET_PeerIdentity)))
1116 LOG (GNUNET_ERROR_TYPE_DEBUG,
1117 "%s: Received DATA from non-confirming peer\n",
1118 GNUNET_i2s (&socket->other_peer));
1122 switch (socket->state)
1124 case STATE_ESTABLISHED:
1125 case STATE_TRANSMIT_CLOSED:
1126 case STATE_TRANSMIT_CLOSE_WAIT:
1128 /* check if the message's sequence number is in the range we are
1130 relative_sequence_number =
1131 ntohl (msg->sequence_number) - socket->read_sequence_number;
1132 if ( relative_sequence_number > GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH)
1134 LOG (GNUNET_ERROR_TYPE_DEBUG,
1135 "%s: Ignoring received message with sequence number %u\n",
1136 GNUNET_i2s (&socket->other_peer),
1137 ntohl (msg->sequence_number));
1138 /* Start ACK sending task if one is not already present */
1139 if (GNUNET_SCHEDULER_NO_TASK == socket->ack_task_id)
1141 socket->ack_task_id =
1142 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_ntoh
1143 (msg->ack_deadline),
1150 /* Check if we have already seen this message */
1151 if (GNUNET_YES == ackbitmap_is_bit_set (&socket->ack_bitmap,
1152 relative_sequence_number))
1154 LOG (GNUNET_ERROR_TYPE_DEBUG,
1155 "%s: Ignoring already received message with sequence number %u\n",
1156 GNUNET_i2s (&socket->other_peer),
1157 ntohl (msg->sequence_number));
1158 /* Start ACK sending task if one is not already present */
1159 if (GNUNET_SCHEDULER_NO_TASK == socket->ack_task_id)
1161 socket->ack_task_id =
1162 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_ntoh
1163 (msg->ack_deadline),
1170 LOG (GNUNET_ERROR_TYPE_DEBUG,
1171 "%s: Receiving DATA with sequence number: %u and size: %d from %s\n",
1172 GNUNET_i2s (&socket->other_peer),
1173 ntohl (msg->sequence_number),
1174 ntohs (msg->header.header.size),
1175 GNUNET_i2s (&socket->other_peer));
1177 /* Check if we have to allocate the buffer */
1178 size -= sizeof (struct GNUNET_STREAM_DataMessage);
1179 relative_offset = ntohl (msg->offset) - socket->read_offset;
1180 bytes_needed = relative_offset + size;
1181 if (bytes_needed > socket->receive_buffer_size)
1183 if (bytes_needed <= RECEIVE_BUFFER_SIZE)
1185 socket->receive_buffer = GNUNET_realloc (socket->receive_buffer,
1187 socket->receive_buffer_size = bytes_needed;
1191 LOG (GNUNET_ERROR_TYPE_DEBUG,
1192 "%s: Cannot accommodate packet %d as buffer is full\n",
1193 GNUNET_i2s (&socket->other_peer),
1194 ntohl (msg->sequence_number));
1199 /* Copy Data to buffer */
1201 GNUNET_assert (relative_offset + size <= socket->receive_buffer_size);
1202 memcpy (socket->receive_buffer + relative_offset,
1205 socket->receive_buffer_boundaries[relative_sequence_number] =
1206 relative_offset + size;
1208 /* Modify the ACK bitmap */
1209 ackbitmap_modify_bit (&socket->ack_bitmap,
1210 relative_sequence_number,
1213 /* Start ACK sending task if one is not already present */
1214 if (GNUNET_SCHEDULER_NO_TASK == socket->ack_task_id)
1216 socket->ack_task_id =
1217 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_ntoh
1218 (msg->ack_deadline),
1223 if ((NULL != socket->read_handle) /* A read handle is waiting */
1224 /* There is no current read task */
1225 && (GNUNET_SCHEDULER_NO_TASK == socket->read_task_id)
1226 /* We have the first packet */
1227 && (GNUNET_YES == ackbitmap_is_bit_set(&socket->ack_bitmap,
1230 LOG (GNUNET_ERROR_TYPE_DEBUG,
1231 "%s: Scheduling read processor\n",
1232 GNUNET_i2s (&socket->other_peer));
1234 socket->read_task_id =
1235 GNUNET_SCHEDULER_add_now (&call_read_processor,
1242 LOG (GNUNET_ERROR_TYPE_DEBUG,
1243 "%s: Received data message when it cannot be handled\n",
1244 GNUNET_i2s (&socket->other_peer));
1252 * Client's message Handler for GNUNET_MESSAGE_TYPE_STREAM_DATA
1254 * @param cls the socket (set from GNUNET_MESH_connect)
1255 * @param tunnel connection to the other end
1256 * @param tunnel_ctx place to store local state associated with the tunnel
1257 * @param sender who sent the message
1258 * @param message the actual message
1259 * @param atsi performance data for the connection
1260 * @return GNUNET_OK to keep the connection open,
1261 * GNUNET_SYSERR to close it (signal serious error)
1264 client_handle_data (void *cls,
1265 struct GNUNET_MESH_Tunnel *tunnel,
1267 const struct GNUNET_PeerIdentity *sender,
1268 const struct GNUNET_MessageHeader *message,
1269 const struct GNUNET_ATS_Information*atsi)
1271 struct GNUNET_STREAM_Socket *socket = cls;
1273 return handle_data (socket,
1276 (const struct GNUNET_STREAM_DataMessage *) message,
1282 * Callback to set state to ESTABLISHED
1284 * @param cls the closure from queue_message FIXME: document
1285 * @param socket the socket to requiring state change
1288 set_state_established (void *cls,
1289 struct GNUNET_STREAM_Socket *socket)
1291 LOG (GNUNET_ERROR_TYPE_DEBUG,
1292 "%s: Attaining ESTABLISHED state\n",
1293 GNUNET_i2s (&socket->other_peer));
1294 socket->write_offset = 0;
1295 socket->read_offset = 0;
1296 socket->state = STATE_ESTABLISHED;
1297 /* FIXME: What if listen_cb is NULL */
1298 if (NULL != socket->lsocket)
1300 LOG (GNUNET_ERROR_TYPE_DEBUG,
1301 "%s: Calling listen callback\n",
1302 GNUNET_i2s (&socket->other_peer));
1303 if (GNUNET_SYSERR ==
1304 socket->lsocket->listen_cb (socket->lsocket->listen_cb_cls,
1306 &socket->other_peer))
1308 socket->state = STATE_CLOSED;
1309 /* FIXME: We should close in a decent way */
1310 GNUNET_MESH_tunnel_destroy (socket->tunnel); /* Destroy the tunnel */
1311 GNUNET_free (socket);
1314 else if (socket->open_cb)
1315 socket->open_cb (socket->open_cls, socket);
1320 * Callback to set state to HELLO_WAIT
1322 * @param cls the closure from queue_message
1323 * @param socket the socket to requiring state change
1326 set_state_hello_wait (void *cls,
1327 struct GNUNET_STREAM_Socket *socket)
1329 GNUNET_assert (STATE_INIT == socket->state);
1330 LOG (GNUNET_ERROR_TYPE_DEBUG,
1331 "%s: Attaining HELLO_WAIT state\n",
1332 GNUNET_i2s (&socket->other_peer));
1333 socket->state = STATE_HELLO_WAIT;
1338 * Callback to set state to CLOSE_WAIT
1340 * @param cls the closure from queue_message
1341 * @param socket the socket requiring state change
1344 set_state_close_wait (void *cls,
1345 struct GNUNET_STREAM_Socket *socket)
1347 LOG (GNUNET_ERROR_TYPE_DEBUG,
1348 "%s: Attaing CLOSE_WAIT state\n",
1349 GNUNET_i2s (&socket->other_peer));
1350 socket->state = STATE_CLOSE_WAIT;
1351 GNUNET_free_non_null (socket->receive_buffer); /* Free the receive buffer */
1352 socket->receive_buffer = NULL;
1353 socket->receive_buffer_size = 0;
1358 * Callback to set state to RECEIVE_CLOSE_WAIT
1360 * @param cls the closure from queue_message
1361 * @param socket the socket requiring state change
1364 set_state_receive_close_wait (void *cls,
1365 struct GNUNET_STREAM_Socket *socket)
1367 LOG (GNUNET_ERROR_TYPE_DEBUG,
1368 "%s: Attaing RECEIVE_CLOSE_WAIT state\n",
1369 GNUNET_i2s (&socket->other_peer));
1370 socket->state = STATE_RECEIVE_CLOSE_WAIT;
1371 GNUNET_free_non_null (socket->receive_buffer); /* Free the receive buffer */
1372 socket->receive_buffer = NULL;
1373 socket->receive_buffer_size = 0;
1378 * Callback to set state to TRANSMIT_CLOSE_WAIT
1380 * @param cls the closure from queue_message
1381 * @param socket the socket requiring state change
1384 set_state_transmit_close_wait (void *cls,
1385 struct GNUNET_STREAM_Socket *socket)
1387 LOG (GNUNET_ERROR_TYPE_DEBUG,
1388 "%s: Attaing TRANSMIT_CLOSE_WAIT state\n",
1389 GNUNET_i2s (&socket->other_peer));
1390 socket->state = STATE_TRANSMIT_CLOSE_WAIT;
1395 * Callback to set state to CLOSED
1397 * @param cls the closure from queue_message
1398 * @param socket the socket requiring state change
1401 set_state_closed (void *cls,
1402 struct GNUNET_STREAM_Socket *socket)
1404 socket->state = STATE_CLOSED;
1408 * Returns a new HelloAckMessage. Also sets the write sequence number for the
1411 * @param socket the socket for which this HelloAckMessage has to be generated
1412 * @return the HelloAckMessage
1414 static struct GNUNET_STREAM_HelloAckMessage *
1415 generate_hello_ack_msg (struct GNUNET_STREAM_Socket *socket)
1417 struct GNUNET_STREAM_HelloAckMessage *msg;
1419 /* Get the random sequence number */
1420 if (GNUNET_YES == socket->testing_active)
1421 socket->write_sequence_number =
1422 socket->testing_set_write_sequence_number_value;
1424 socket->write_sequence_number =
1425 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1426 LOG (GNUNET_ERROR_TYPE_DEBUG,
1427 "%s: write sequence number %u\n",
1428 GNUNET_i2s (&socket->other_peer),
1429 (unsigned int) socket->write_sequence_number);
1431 msg = GNUNET_malloc (sizeof (struct GNUNET_STREAM_HelloAckMessage));
1432 msg->header.header.size =
1433 htons (sizeof (struct GNUNET_STREAM_HelloAckMessage));
1434 msg->header.header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_HELLO_ACK);
1435 msg->sequence_number = htonl (socket->write_sequence_number);
1436 msg->receiver_window_size = htonl (RECEIVE_BUFFER_SIZE);
1443 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_HELLO_ACK
1445 * @param cls the socket (set from GNUNET_MESH_connect)
1446 * @param tunnel connection to the other end
1447 * @param tunnel_ctx this is NULL
1448 * @param sender who sent the message
1449 * @param message the actual message
1450 * @param atsi performance data for the connection
1451 * @return GNUNET_OK to keep the connection open,
1452 * GNUNET_SYSERR to close it (signal serious error)
1455 client_handle_hello_ack (void *cls,
1456 struct GNUNET_MESH_Tunnel *tunnel,
1458 const struct GNUNET_PeerIdentity *sender,
1459 const struct GNUNET_MessageHeader *message,
1460 const struct GNUNET_ATS_Information*atsi)
1462 struct GNUNET_STREAM_Socket *socket = cls;
1463 const struct GNUNET_STREAM_HelloAckMessage *ack_msg;
1464 struct GNUNET_STREAM_HelloAckMessage *reply;
1466 if (0 != memcmp (sender,
1467 &socket->other_peer,
1468 sizeof (struct GNUNET_PeerIdentity)))
1470 LOG (GNUNET_ERROR_TYPE_DEBUG,
1471 "%s: Received HELLO_ACK from non-confirming peer\n",
1472 GNUNET_i2s (&socket->other_peer));
1475 ack_msg = (const struct GNUNET_STREAM_HelloAckMessage *) message;
1476 LOG (GNUNET_ERROR_TYPE_DEBUG,
1477 "%s: Received HELLO_ACK from %s\n",
1478 GNUNET_i2s (&socket->other_peer),
1479 GNUNET_i2s (&socket->other_peer));
1481 GNUNET_assert (socket->tunnel == tunnel);
1482 switch (socket->state)
1484 case STATE_HELLO_WAIT:
1485 socket->read_sequence_number = ntohl (ack_msg->sequence_number);
1486 LOG (GNUNET_ERROR_TYPE_DEBUG,
1487 "%s: Read sequence number %u\n",
1488 GNUNET_i2s (&socket->other_peer),
1489 (unsigned int) socket->read_sequence_number);
1490 socket->receiver_window_available = ntohl (ack_msg->receiver_window_size);
1491 reply = generate_hello_ack_msg (socket);
1492 queue_message (socket,
1494 &set_state_established,
1497 case STATE_ESTABLISHED:
1498 case STATE_RECEIVE_CLOSE_WAIT:
1499 // call statistics (# ACKs ignored++)
1503 LOG (GNUNET_ERROR_TYPE_DEBUG,
1504 "%s: Server %s sent HELLO_ACK when in state %d\n",
1505 GNUNET_i2s (&socket->other_peer),
1506 GNUNET_i2s (&socket->other_peer),
1508 socket->state = STATE_CLOSED; // introduce STATE_ERROR?
1509 return GNUNET_SYSERR;
1516 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_RESET
1518 * @param cls the socket (set from GNUNET_MESH_connect)
1519 * @param tunnel connection to the other end
1520 * @param tunnel_ctx this is NULL
1521 * @param sender who sent the message
1522 * @param message the actual message
1523 * @param atsi performance data for the connection
1524 * @return GNUNET_OK to keep the connection open,
1525 * GNUNET_SYSERR to close it (signal serious error)
1528 client_handle_reset (void *cls,
1529 struct GNUNET_MESH_Tunnel *tunnel,
1531 const struct GNUNET_PeerIdentity *sender,
1532 const struct GNUNET_MessageHeader *message,
1533 const struct GNUNET_ATS_Information*atsi)
1535 // struct GNUNET_STREAM_Socket *socket = cls;
1542 * Common message handler for handling TRANSMIT_CLOSE messages
1544 * @param socket the socket through which the ack was received
1545 * @param tunnel connection to the other end
1546 * @param sender who sent the message
1547 * @param msg the transmit close message
1548 * @param atsi performance data for the connection
1549 * @return GNUNET_OK to keep the connection open,
1550 * GNUNET_SYSERR to close it (signal serious error)
1553 handle_transmit_close (struct GNUNET_STREAM_Socket *socket,
1554 struct GNUNET_MESH_Tunnel *tunnel,
1555 const struct GNUNET_PeerIdentity *sender,
1556 const struct GNUNET_STREAM_MessageHeader *msg,
1557 const struct GNUNET_ATS_Information*atsi)
1559 struct GNUNET_STREAM_MessageHeader *reply;
1561 switch (socket->state)
1563 case STATE_ESTABLISHED:
1564 socket->state = STATE_RECEIVE_CLOSED;
1566 /* Send TRANSMIT_CLOSE_ACK */
1567 reply = GNUNET_malloc (sizeof (struct GNUNET_STREAM_MessageHeader));
1568 reply->header.type =
1569 htons (GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE_ACK);
1570 reply->header.size = htons (sizeof (struct GNUNET_STREAM_MessageHeader));
1571 queue_message (socket, reply, NULL, NULL);
1575 /* FIXME: Call statistics? */
1583 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE
1585 * @param cls the socket (set from GNUNET_MESH_connect)
1586 * @param tunnel connection to the other end
1587 * @param tunnel_ctx this is NULL
1588 * @param sender who sent the message
1589 * @param message the actual message
1590 * @param atsi performance data for the connection
1591 * @return GNUNET_OK to keep the connection open,
1592 * GNUNET_SYSERR to close it (signal serious error)
1595 client_handle_transmit_close (void *cls,
1596 struct GNUNET_MESH_Tunnel *tunnel,
1598 const struct GNUNET_PeerIdentity *sender,
1599 const struct GNUNET_MessageHeader *message,
1600 const struct GNUNET_ATS_Information*atsi)
1602 struct GNUNET_STREAM_Socket *socket = cls;
1604 return handle_transmit_close (socket,
1607 (struct GNUNET_STREAM_MessageHeader *)message,
1613 * Generic handler for GNUNET_MESSAGE_TYPE_STREAM_*_CLOSE_ACK messages
1615 * @param socket the socket
1616 * @param tunnel connection to the other end
1617 * @param sender who sent the message
1618 * @param message the actual message
1619 * @param atsi performance data for the connection
1620 * @param operation the close operation which is being ACK'ed
1621 * @return GNUNET_OK to keep the connection open,
1622 * GNUNET_SYSERR to close it (signal serious error)
1625 handle_generic_close_ack (struct GNUNET_STREAM_Socket *socket,
1626 struct GNUNET_MESH_Tunnel *tunnel,
1627 const struct GNUNET_PeerIdentity *sender,
1628 const struct GNUNET_STREAM_MessageHeader *message,
1629 const struct GNUNET_ATS_Information *atsi,
1632 struct GNUNET_STREAM_ShutdownHandle *shutdown_handle;
1634 shutdown_handle = socket->shutdown_handle;
1635 if (NULL == shutdown_handle)
1637 LOG (GNUNET_ERROR_TYPE_DEBUG,
1638 "%s: Received CLOSE_ACK when shutdown handle is NULL\n",
1639 GNUNET_i2s (&socket->other_peer));
1646 switch (socket->state)
1648 case STATE_CLOSE_WAIT:
1649 if (SHUT_RDWR != shutdown_handle->operation)
1651 LOG (GNUNET_ERROR_TYPE_DEBUG,
1652 "%s: Received CLOSE_ACK when shutdown handle is not for "
1654 GNUNET_i2s (&socket->other_peer));
1658 LOG (GNUNET_ERROR_TYPE_DEBUG,
1659 "%s: Received CLOSE_ACK from %s\n",
1660 GNUNET_i2s (&socket->other_peer),
1661 GNUNET_i2s (&socket->other_peer));
1662 socket->state = STATE_CLOSED;
1665 LOG (GNUNET_ERROR_TYPE_DEBUG,
1666 "%s: Received CLOSE_ACK when in it not expected\n",
1667 GNUNET_i2s (&socket->other_peer));
1673 switch (socket->state)
1675 case STATE_RECEIVE_CLOSE_WAIT:
1676 if (SHUT_RD != shutdown_handle->operation)
1678 LOG (GNUNET_ERROR_TYPE_DEBUG,
1679 "%s: Received RECEIVE_CLOSE_ACK when shutdown handle "
1680 "is not for SHUT_RD\n",
1681 GNUNET_i2s (&socket->other_peer));
1685 LOG (GNUNET_ERROR_TYPE_DEBUG,
1686 "%s: Received RECEIVE_CLOSE_ACK from %s\n",
1687 GNUNET_i2s (&socket->other_peer),
1688 GNUNET_i2s (&socket->other_peer));
1689 socket->state = STATE_RECEIVE_CLOSED;
1692 LOG (GNUNET_ERROR_TYPE_DEBUG,
1693 "%s: Received RECEIVE_CLOSE_ACK when in it not expected\n",
1694 GNUNET_i2s (&socket->other_peer));
1700 switch (socket->state)
1702 case STATE_TRANSMIT_CLOSE_WAIT:
1703 if (SHUT_WR != shutdown_handle->operation)
1705 LOG (GNUNET_ERROR_TYPE_DEBUG,
1706 "%s: Received TRANSMIT_CLOSE_ACK when shutdown handle "
1707 "is not for SHUT_WR\n",
1708 GNUNET_i2s (&socket->other_peer));
1712 LOG (GNUNET_ERROR_TYPE_DEBUG,
1713 "%s: Received TRANSMIT_CLOSE_ACK from %s\n",
1714 GNUNET_i2s (&socket->other_peer),
1715 GNUNET_i2s (&socket->other_peer));
1716 socket->state = STATE_TRANSMIT_CLOSED;
1719 LOG (GNUNET_ERROR_TYPE_DEBUG,
1720 "%s: Received TRANSMIT_CLOSE_ACK when in it not expected\n",
1721 GNUNET_i2s (&socket->other_peer));
1730 if (NULL != shutdown_handle->completion_cb) /* Shutdown completion */
1731 shutdown_handle->completion_cb(shutdown_handle->completion_cls,
1733 GNUNET_free (shutdown_handle); /* Free shutdown handle */
1734 socket->shutdown_handle = NULL;
1735 if (GNUNET_SCHEDULER_NO_TASK
1736 != shutdown_handle->close_msg_retransmission_task_id)
1738 GNUNET_SCHEDULER_cancel
1739 (shutdown_handle->close_msg_retransmission_task_id);
1740 shutdown_handle->close_msg_retransmission_task_id =
1741 GNUNET_SCHEDULER_NO_TASK;
1748 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE_ACK
1750 * @param cls the socket (set from GNUNET_MESH_connect)
1751 * @param tunnel connection to the other end
1752 * @param tunnel_ctx this is NULL
1753 * @param sender who sent the message
1754 * @param message the actual message
1755 * @param atsi performance data for the connection
1756 * @return GNUNET_OK to keep the connection open,
1757 * GNUNET_SYSERR to close it (signal serious error)
1760 client_handle_transmit_close_ack (void *cls,
1761 struct GNUNET_MESH_Tunnel *tunnel,
1763 const struct GNUNET_PeerIdentity *sender,
1764 const struct GNUNET_MessageHeader *message,
1765 const struct GNUNET_ATS_Information*atsi)
1767 struct GNUNET_STREAM_Socket *socket = cls;
1769 return handle_generic_close_ack (socket,
1772 (const struct GNUNET_STREAM_MessageHeader *)
1780 * Generic handler for GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE
1782 * @param socket the socket
1783 * @param tunnel connection to the other end
1784 * @param sender who sent the message
1785 * @param message the actual message
1786 * @param atsi performance data for the connection
1787 * @return GNUNET_OK to keep the connection open,
1788 * GNUNET_SYSERR to close it (signal serious error)
1791 handle_receive_close (struct GNUNET_STREAM_Socket *socket,
1792 struct GNUNET_MESH_Tunnel *tunnel,
1793 const struct GNUNET_PeerIdentity *sender,
1794 const struct GNUNET_STREAM_MessageHeader *message,
1795 const struct GNUNET_ATS_Information *atsi)
1797 struct GNUNET_STREAM_MessageHeader *receive_close_ack;
1799 switch (socket->state)
1803 case STATE_HELLO_WAIT:
1804 LOG (GNUNET_ERROR_TYPE_DEBUG,
1805 "%s: Ignoring RECEIVE_CLOSE as it cannot be handled now\n",
1806 GNUNET_i2s (&socket->other_peer));
1812 LOG (GNUNET_ERROR_TYPE_DEBUG,
1813 "%s: Received RECEIVE_CLOSE from %s\n",
1814 GNUNET_i2s (&socket->other_peer),
1815 GNUNET_i2s (&socket->other_peer));
1817 GNUNET_malloc (sizeof (struct GNUNET_STREAM_MessageHeader));
1818 receive_close_ack->header.size =
1819 htons (sizeof (struct GNUNET_STREAM_MessageHeader));
1820 receive_close_ack->header.type =
1821 htons (GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE_ACK);
1822 queue_message (socket,
1827 /* FIXME: Handle the case where write handle is present; the write operation
1828 should be deemed as finised and the write continuation callback
1829 has to be called with the stream status GNUNET_STREAM_SHUTDOWN */
1835 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE
1837 * @param cls the socket (set from GNUNET_MESH_connect)
1838 * @param tunnel connection to the other end
1839 * @param tunnel_ctx this is NULL
1840 * @param sender who sent the message
1841 * @param message the actual message
1842 * @param atsi performance data for the connection
1843 * @return GNUNET_OK to keep the connection open,
1844 * GNUNET_SYSERR to close it (signal serious error)
1847 client_handle_receive_close (void *cls,
1848 struct GNUNET_MESH_Tunnel *tunnel,
1850 const struct GNUNET_PeerIdentity *sender,
1851 const struct GNUNET_MessageHeader *message,
1852 const struct GNUNET_ATS_Information*atsi)
1854 struct GNUNET_STREAM_Socket *socket = cls;
1857 handle_receive_close (socket,
1860 (const struct GNUNET_STREAM_MessageHeader *) message,
1866 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE_ACK
1868 * @param cls the socket (set from GNUNET_MESH_connect)
1869 * @param tunnel connection to the other end
1870 * @param tunnel_ctx this is NULL
1871 * @param sender who sent the message
1872 * @param message the actual message
1873 * @param atsi performance data for the connection
1874 * @return GNUNET_OK to keep the connection open,
1875 * GNUNET_SYSERR to close it (signal serious error)
1878 client_handle_receive_close_ack (void *cls,
1879 struct GNUNET_MESH_Tunnel *tunnel,
1881 const struct GNUNET_PeerIdentity *sender,
1882 const struct GNUNET_MessageHeader *message,
1883 const struct GNUNET_ATS_Information*atsi)
1885 struct GNUNET_STREAM_Socket *socket = cls;
1887 return handle_generic_close_ack (socket,
1890 (const struct GNUNET_STREAM_MessageHeader *)
1898 * Generic handler for GNUNET_MESSAGE_TYPE_STREAM_CLOSE
1900 * @param socket the socket
1901 * @param tunnel connection to the other end
1902 * @param sender who sent the message
1903 * @param message the actual message
1904 * @param atsi performance data for the connection
1905 * @return GNUNET_OK to keep the connection open,
1906 * GNUNET_SYSERR to close it (signal serious error)
1909 handle_close (struct GNUNET_STREAM_Socket *socket,
1910 struct GNUNET_MESH_Tunnel *tunnel,
1911 const struct GNUNET_PeerIdentity *sender,
1912 const struct GNUNET_STREAM_MessageHeader *message,
1913 const struct GNUNET_ATS_Information*atsi)
1915 struct GNUNET_STREAM_MessageHeader *close_ack;
1917 switch (socket->state)
1921 case STATE_HELLO_WAIT:
1922 LOG (GNUNET_ERROR_TYPE_DEBUG,
1923 "%s: Ignoring RECEIVE_CLOSE as it cannot be handled now\n",
1924 GNUNET_i2s (&socket->other_peer));
1930 LOG (GNUNET_ERROR_TYPE_DEBUG,
1931 "%s: Received CLOSE from %s\n",
1932 GNUNET_i2s (&socket->other_peer),
1933 GNUNET_i2s (&socket->other_peer));
1934 close_ack = GNUNET_malloc (sizeof (struct GNUNET_STREAM_MessageHeader));
1935 close_ack->header.size = htons (sizeof (struct GNUNET_STREAM_MessageHeader));
1936 close_ack->header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_CLOSE_ACK);
1937 queue_message (socket,
1941 if (socket->state == STATE_CLOSED)
1944 GNUNET_free_non_null (socket->receive_buffer); /* Free the receive buffer */
1945 socket->receive_buffer = NULL;
1946 socket->receive_buffer_size = 0;
1952 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_CLOSE
1954 * @param cls the socket (set from GNUNET_MESH_connect)
1955 * @param tunnel connection to the other end
1956 * @param tunnel_ctx this is NULL
1957 * @param sender who sent the message
1958 * @param message the actual message
1959 * @param atsi performance data for the connection
1960 * @return GNUNET_OK to keep the connection open,
1961 * GNUNET_SYSERR to close it (signal serious error)
1964 client_handle_close (void *cls,
1965 struct GNUNET_MESH_Tunnel *tunnel,
1967 const struct GNUNET_PeerIdentity *sender,
1968 const struct GNUNET_MessageHeader *message,
1969 const struct GNUNET_ATS_Information*atsi)
1971 struct GNUNET_STREAM_Socket *socket = cls;
1973 return handle_close (socket,
1976 (const struct GNUNET_STREAM_MessageHeader *) message,
1982 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_CLOSE_ACK
1984 * @param cls the socket (set from GNUNET_MESH_connect)
1985 * @param tunnel connection to the other end
1986 * @param tunnel_ctx this is NULL
1987 * @param sender who sent the message
1988 * @param message the actual message
1989 * @param atsi performance data for the connection
1990 * @return GNUNET_OK to keep the connection open,
1991 * GNUNET_SYSERR to close it (signal serious error)
1994 client_handle_close_ack (void *cls,
1995 struct GNUNET_MESH_Tunnel *tunnel,
1997 const struct GNUNET_PeerIdentity *sender,
1998 const struct GNUNET_MessageHeader *message,
1999 const struct GNUNET_ATS_Information *atsi)
2001 struct GNUNET_STREAM_Socket *socket = cls;
2003 return handle_generic_close_ack (socket,
2006 (const struct GNUNET_STREAM_MessageHeader *)
2012 /*****************************/
2013 /* Server's Message Handlers */
2014 /*****************************/
2017 * Server's message Handler for GNUNET_MESSAGE_TYPE_STREAM_DATA
2019 * @param cls the closure
2020 * @param tunnel connection to the other end
2021 * @param tunnel_ctx the socket
2022 * @param sender who sent the message
2023 * @param message the actual message
2024 * @param atsi performance data for the connection
2025 * @return GNUNET_OK to keep the connection open,
2026 * GNUNET_SYSERR to close it (signal serious error)
2029 server_handle_data (void *cls,
2030 struct GNUNET_MESH_Tunnel *tunnel,
2032 const struct GNUNET_PeerIdentity *sender,
2033 const struct GNUNET_MessageHeader *message,
2034 const struct GNUNET_ATS_Information*atsi)
2036 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2038 return handle_data (socket,
2041 (const struct GNUNET_STREAM_DataMessage *)message,
2047 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_HELLO
2049 * @param cls the closure
2050 * @param tunnel connection to the other end
2051 * @param tunnel_ctx the socket
2052 * @param sender who sent the message
2053 * @param message the actual message
2054 * @param atsi performance data for the connection
2055 * @return GNUNET_OK to keep the connection open,
2056 * GNUNET_SYSERR to close it (signal serious error)
2059 server_handle_hello (void *cls,
2060 struct GNUNET_MESH_Tunnel *tunnel,
2062 const struct GNUNET_PeerIdentity *sender,
2063 const struct GNUNET_MessageHeader *message,
2064 const struct GNUNET_ATS_Information*atsi)
2066 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2067 struct GNUNET_STREAM_HelloAckMessage *reply;
2069 if (0 != memcmp (sender,
2070 &socket->other_peer,
2071 sizeof (struct GNUNET_PeerIdentity)))
2073 LOG (GNUNET_ERROR_TYPE_DEBUG,
2074 "%s: Received HELLO from non-confirming peer\n",
2075 GNUNET_i2s (&socket->other_peer));
2079 GNUNET_assert (GNUNET_MESSAGE_TYPE_STREAM_HELLO ==
2080 ntohs (message->type));
2081 GNUNET_assert (socket->tunnel == tunnel);
2082 LOG (GNUNET_ERROR_TYPE_DEBUG,
2083 "%s: Received HELLO from %s\n",
2084 GNUNET_i2s (&socket->other_peer),
2085 GNUNET_i2s (&socket->other_peer));
2087 if (STATE_INIT == socket->state)
2089 reply = generate_hello_ack_msg (socket);
2090 queue_message (socket,
2092 &set_state_hello_wait,
2097 LOG (GNUNET_ERROR_TYPE_DEBUG,
2098 "%s: Client sent HELLO when in state %d\n",
2099 GNUNET_i2s (&socket->other_peer),
2101 /* FIXME: Send RESET? */
2109 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_HELLO_ACK
2111 * @param cls the closure
2112 * @param tunnel connection to the other end
2113 * @param tunnel_ctx the socket
2114 * @param sender who sent the message
2115 * @param message the actual message
2116 * @param atsi performance data for the connection
2117 * @return GNUNET_OK to keep the connection open,
2118 * GNUNET_SYSERR to close it (signal serious error)
2121 server_handle_hello_ack (void *cls,
2122 struct GNUNET_MESH_Tunnel *tunnel,
2124 const struct GNUNET_PeerIdentity *sender,
2125 const struct GNUNET_MessageHeader *message,
2126 const struct GNUNET_ATS_Information*atsi)
2128 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2129 const struct GNUNET_STREAM_HelloAckMessage *ack_message;
2131 GNUNET_assert (GNUNET_MESSAGE_TYPE_STREAM_HELLO_ACK ==
2132 ntohs (message->type));
2133 GNUNET_assert (socket->tunnel == tunnel);
2134 ack_message = (struct GNUNET_STREAM_HelloAckMessage *) message;
2135 if (STATE_HELLO_WAIT == socket->state)
2137 LOG (GNUNET_ERROR_TYPE_DEBUG,
2138 "%s: Received HELLO_ACK from %s\n",
2139 GNUNET_i2s (&socket->other_peer),
2140 GNUNET_i2s (&socket->other_peer));
2141 socket->read_sequence_number = ntohl (ack_message->sequence_number);
2142 LOG (GNUNET_ERROR_TYPE_DEBUG,
2143 "%s: Read sequence number %u\n",
2144 GNUNET_i2s (&socket->other_peer),
2145 (unsigned int) socket->read_sequence_number);
2146 socket->receiver_window_available =
2147 ntohl (ack_message->receiver_window_size);
2148 /* Attain ESTABLISHED state */
2149 set_state_established (NULL, socket);
2153 LOG (GNUNET_ERROR_TYPE_DEBUG,
2154 "Client sent HELLO_ACK when in state %d\n", socket->state);
2155 /* FIXME: Send RESET? */
2163 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_RESET
2165 * @param cls the closure
2166 * @param tunnel connection to the other end
2167 * @param tunnel_ctx the socket
2168 * @param sender who sent the message
2169 * @param message the actual message
2170 * @param atsi performance data for the connection
2171 * @return GNUNET_OK to keep the connection open,
2172 * GNUNET_SYSERR to close it (signal serious error)
2175 server_handle_reset (void *cls,
2176 struct GNUNET_MESH_Tunnel *tunnel,
2178 const struct GNUNET_PeerIdentity *sender,
2179 const struct GNUNET_MessageHeader *message,
2180 const struct GNUNET_ATS_Information*atsi)
2182 // struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2189 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE
2191 * @param cls the closure
2192 * @param tunnel connection to the other end
2193 * @param tunnel_ctx the socket
2194 * @param sender who sent the message
2195 * @param message the actual message
2196 * @param atsi performance data for the connection
2197 * @return GNUNET_OK to keep the connection open,
2198 * GNUNET_SYSERR to close it (signal serious error)
2201 server_handle_transmit_close (void *cls,
2202 struct GNUNET_MESH_Tunnel *tunnel,
2204 const struct GNUNET_PeerIdentity *sender,
2205 const struct GNUNET_MessageHeader *message,
2206 const struct GNUNET_ATS_Information*atsi)
2208 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2210 return handle_transmit_close (socket,
2213 (struct GNUNET_STREAM_MessageHeader *)message,
2219 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE_ACK
2221 * @param cls the closure
2222 * @param tunnel connection to the other end
2223 * @param tunnel_ctx the socket
2224 * @param sender who sent the message
2225 * @param message the actual message
2226 * @param atsi performance data for the connection
2227 * @return GNUNET_OK to keep the connection open,
2228 * GNUNET_SYSERR to close it (signal serious error)
2231 server_handle_transmit_close_ack (void *cls,
2232 struct GNUNET_MESH_Tunnel *tunnel,
2234 const struct GNUNET_PeerIdentity *sender,
2235 const struct GNUNET_MessageHeader *message,
2236 const struct GNUNET_ATS_Information*atsi)
2238 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2240 return handle_generic_close_ack (socket,
2243 (const struct GNUNET_STREAM_MessageHeader *)
2251 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE
2253 * @param cls the closure
2254 * @param tunnel connection to the other end
2255 * @param tunnel_ctx the socket
2256 * @param sender who sent the message
2257 * @param message the actual message
2258 * @param atsi performance data for the connection
2259 * @return GNUNET_OK to keep the connection open,
2260 * GNUNET_SYSERR to close it (signal serious error)
2263 server_handle_receive_close (void *cls,
2264 struct GNUNET_MESH_Tunnel *tunnel,
2266 const struct GNUNET_PeerIdentity *sender,
2267 const struct GNUNET_MessageHeader *message,
2268 const struct GNUNET_ATS_Information*atsi)
2270 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2273 handle_receive_close (socket,
2276 (const struct GNUNET_STREAM_MessageHeader *) message,
2282 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE_ACK
2284 * @param cls the closure
2285 * @param tunnel connection to the other end
2286 * @param tunnel_ctx the socket
2287 * @param sender who sent the message
2288 * @param message the actual message
2289 * @param atsi performance data for the connection
2290 * @return GNUNET_OK to keep the connection open,
2291 * GNUNET_SYSERR to close it (signal serious error)
2294 server_handle_receive_close_ack (void *cls,
2295 struct GNUNET_MESH_Tunnel *tunnel,
2297 const struct GNUNET_PeerIdentity *sender,
2298 const struct GNUNET_MessageHeader *message,
2299 const struct GNUNET_ATS_Information*atsi)
2301 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2303 return handle_generic_close_ack (socket,
2306 (const struct GNUNET_STREAM_MessageHeader *)
2314 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_CLOSE
2316 * @param cls the listen socket (from GNUNET_MESH_connect in
2317 * GNUNET_STREAM_listen)
2318 * @param tunnel connection to the other end
2319 * @param tunnel_ctx the socket
2320 * @param sender who sent the message
2321 * @param message the actual message
2322 * @param atsi performance data for the connection
2323 * @return GNUNET_OK to keep the connection open,
2324 * GNUNET_SYSERR to close it (signal serious error)
2327 server_handle_close (void *cls,
2328 struct GNUNET_MESH_Tunnel *tunnel,
2330 const struct GNUNET_PeerIdentity *sender,
2331 const struct GNUNET_MessageHeader *message,
2332 const struct GNUNET_ATS_Information*atsi)
2334 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2336 return handle_close (socket,
2339 (const struct GNUNET_STREAM_MessageHeader *) message,
2345 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_CLOSE_ACK
2347 * @param cls the closure
2348 * @param tunnel connection to the other end
2349 * @param tunnel_ctx the socket
2350 * @param sender who sent the message
2351 * @param message the actual message
2352 * @param atsi performance data for the connection
2353 * @return GNUNET_OK to keep the connection open,
2354 * GNUNET_SYSERR to close it (signal serious error)
2357 server_handle_close_ack (void *cls,
2358 struct GNUNET_MESH_Tunnel *tunnel,
2360 const struct GNUNET_PeerIdentity *sender,
2361 const struct GNUNET_MessageHeader *message,
2362 const struct GNUNET_ATS_Information*atsi)
2364 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2366 return handle_generic_close_ack (socket,
2369 (const struct GNUNET_STREAM_MessageHeader *)
2377 * Handler for DATA_ACK messages
2379 * @param socket the socket through which the ack was received
2380 * @param tunnel connection to the other end
2381 * @param sender who sent the message
2382 * @param ack the acknowledgment message
2383 * @param atsi performance data for the connection
2384 * @return GNUNET_OK to keep the connection open,
2385 * GNUNET_SYSERR to close it (signal serious error)
2388 handle_ack (struct GNUNET_STREAM_Socket *socket,
2389 struct GNUNET_MESH_Tunnel *tunnel,
2390 const struct GNUNET_PeerIdentity *sender,
2391 const struct GNUNET_STREAM_AckMessage *ack,
2392 const struct GNUNET_ATS_Information*atsi)
2394 unsigned int packet;
2395 int need_retransmission;
2396 uint32_t sequence_difference;
2398 if (0 != memcmp (sender,
2399 &socket->other_peer,
2400 sizeof (struct GNUNET_PeerIdentity)))
2402 LOG (GNUNET_ERROR_TYPE_DEBUG,
2403 "%s: Received ACK from non-confirming peer\n",
2404 GNUNET_i2s (&socket->other_peer));
2407 switch (socket->state)
2409 case (STATE_ESTABLISHED):
2410 case (STATE_RECEIVE_CLOSED):
2411 case (STATE_RECEIVE_CLOSE_WAIT):
2412 if (NULL == socket->write_handle)
2414 LOG (GNUNET_ERROR_TYPE_DEBUG,
2415 "%s: Received DATA_ACK when write_handle is NULL\n",
2416 GNUNET_i2s (&socket->other_peer));
2419 /* FIXME: increment in the base sequence number is breaking current flow
2421 if (!((socket->write_sequence_number
2422 - ntohl (ack->base_sequence_number)) < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH))
2424 LOG (GNUNET_ERROR_TYPE_DEBUG,
2425 "%s: Received DATA_ACK with unexpected base sequence number\n",
2426 GNUNET_i2s (&socket->other_peer));
2427 LOG (GNUNET_ERROR_TYPE_DEBUG,
2428 "%s: Current write sequence: %u; Ack's base sequence: %u\n",
2429 GNUNET_i2s (&socket->other_peer),
2430 socket->write_sequence_number,
2431 ntohl (ack->base_sequence_number));
2434 /* FIXME: include the case when write_handle is cancelled - ignore the
2436 LOG (GNUNET_ERROR_TYPE_DEBUG,
2437 "%s: Received DATA_ACK from %s\n",
2438 GNUNET_i2s (&socket->other_peer),
2439 GNUNET_i2s (&socket->other_peer));
2441 /* Cancel the retransmission task */
2442 if (GNUNET_SCHEDULER_NO_TASK != socket->retransmission_timeout_task_id)
2444 GNUNET_SCHEDULER_cancel (socket->retransmission_timeout_task_id);
2445 socket->retransmission_timeout_task_id =
2446 GNUNET_SCHEDULER_NO_TASK;
2448 for (packet=0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
2450 if (NULL == socket->write_handle->messages[packet]) break;
2451 /* BS: Base sequence from ack; PS: sequence num of current packet */
2452 sequence_difference = ntohl (ack->base_sequence_number)
2453 - ntohl (socket->write_handle->messages[packet]->sequence_number);
2454 /* case where BS = PS + GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH */
2455 if ((sequence_difference == GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH)
2456 || ((sequence_difference < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH)
2457 && (0 != sequence_difference))) /* case: BS > PS and BS != PS*/
2459 ackbitmap_modify_bit (&socket->write_handle->ack_bitmap, packet,
2464 ackbitmap_is_bit_set (&socket->write_handle->ack_bitmap,
2465 -sequence_difference))/*inversion as PS >= BS */
2467 ackbitmap_modify_bit (&socket->write_handle->ack_bitmap, packet,
2471 /* Update the receive window remaining
2472 FIXME : Should update with the value from a data ack with greater
2474 socket->receiver_window_available =
2475 ntohl (ack->receive_window_remaining);
2476 /* Check if we have received all acknowledgements */
2477 need_retransmission = GNUNET_NO;
2478 for (packet=0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
2480 if (NULL == socket->write_handle->messages[packet]) break;
2481 if (GNUNET_YES != ackbitmap_is_bit_set
2482 (&socket->write_handle->ack_bitmap,packet))
2484 need_retransmission = GNUNET_YES;
2488 if (GNUNET_YES == need_retransmission)
2490 write_data (socket);
2492 else /* We have to call the write continuation callback now */
2494 struct GNUNET_STREAM_IOWriteHandle *write_handle;
2496 /* Free the packets */
2497 for (packet=0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
2499 GNUNET_free_non_null (socket->write_handle->messages[packet]);
2501 write_handle = socket->write_handle;
2502 socket->write_handle = NULL;
2503 if (NULL != write_handle->write_cont)
2504 write_handle->write_cont (write_handle->write_cont_cls,
2506 write_handle->size);
2507 /* We are done with the write handle - Freeing it */
2508 GNUNET_free (write_handle);
2509 LOG (GNUNET_ERROR_TYPE_DEBUG,
2510 "%s: Write completion callback completed\n",
2511 GNUNET_i2s (&socket->other_peer));
2522 * Handler for DATA_ACK messages
2524 * @param cls the 'struct GNUNET_STREAM_Socket'
2525 * @param tunnel connection to the other end
2526 * @param tunnel_ctx unused
2527 * @param sender who sent the message
2528 * @param message the actual message
2529 * @param atsi performance data for the connection
2530 * @return GNUNET_OK to keep the connection open,
2531 * GNUNET_SYSERR to close it (signal serious error)
2534 client_handle_ack (void *cls,
2535 struct GNUNET_MESH_Tunnel *tunnel,
2537 const struct GNUNET_PeerIdentity *sender,
2538 const struct GNUNET_MessageHeader *message,
2539 const struct GNUNET_ATS_Information*atsi)
2541 struct GNUNET_STREAM_Socket *socket = cls;
2542 const struct GNUNET_STREAM_AckMessage *ack = (const struct GNUNET_STREAM_AckMessage *) message;
2544 return handle_ack (socket, tunnel, sender, ack, atsi);
2549 * Handler for DATA_ACK messages
2551 * @param cls the server's listen socket
2552 * @param tunnel connection to the other end
2553 * @param tunnel_ctx pointer to the 'struct GNUNET_STREAM_Socket*'
2554 * @param sender who sent the message
2555 * @param message the actual message
2556 * @param atsi performance data for the connection
2557 * @return GNUNET_OK to keep the connection open,
2558 * GNUNET_SYSERR to close it (signal serious error)
2561 server_handle_ack (void *cls,
2562 struct GNUNET_MESH_Tunnel *tunnel,
2564 const struct GNUNET_PeerIdentity *sender,
2565 const struct GNUNET_MessageHeader *message,
2566 const struct GNUNET_ATS_Information*atsi)
2568 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2569 const struct GNUNET_STREAM_AckMessage *ack = (const struct GNUNET_STREAM_AckMessage *) message;
2571 return handle_ack (socket, tunnel, sender, ack, atsi);
2576 * For client message handlers, the stream socket is in the
2579 static struct GNUNET_MESH_MessageHandler client_message_handlers[] = {
2580 {&client_handle_data, GNUNET_MESSAGE_TYPE_STREAM_DATA, 0},
2581 {&client_handle_ack, GNUNET_MESSAGE_TYPE_STREAM_ACK,
2582 sizeof (struct GNUNET_STREAM_AckMessage) },
2583 {&client_handle_hello_ack, GNUNET_MESSAGE_TYPE_STREAM_HELLO_ACK,
2584 sizeof (struct GNUNET_STREAM_HelloAckMessage)},
2585 {&client_handle_reset, GNUNET_MESSAGE_TYPE_STREAM_RESET,
2586 sizeof (struct GNUNET_STREAM_MessageHeader)},
2587 {&client_handle_transmit_close, GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE,
2588 sizeof (struct GNUNET_STREAM_MessageHeader)},
2589 {&client_handle_transmit_close_ack, GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE_ACK,
2590 sizeof (struct GNUNET_STREAM_MessageHeader)},
2591 {&client_handle_receive_close, GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE,
2592 sizeof (struct GNUNET_STREAM_MessageHeader)},
2593 {&client_handle_receive_close_ack, GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE_ACK,
2594 sizeof (struct GNUNET_STREAM_MessageHeader)},
2595 {&client_handle_close, GNUNET_MESSAGE_TYPE_STREAM_CLOSE,
2596 sizeof (struct GNUNET_STREAM_MessageHeader)},
2597 {&client_handle_close_ack, GNUNET_MESSAGE_TYPE_STREAM_CLOSE_ACK,
2598 sizeof (struct GNUNET_STREAM_MessageHeader)},
2604 * For server message handlers, the stream socket is in the
2605 * tunnel context, and the listen socket in the closure argument.
2607 static struct GNUNET_MESH_MessageHandler server_message_handlers[] = {
2608 {&server_handle_data, GNUNET_MESSAGE_TYPE_STREAM_DATA, 0},
2609 {&server_handle_ack, GNUNET_MESSAGE_TYPE_STREAM_ACK,
2610 sizeof (struct GNUNET_STREAM_AckMessage) },
2611 {&server_handle_hello, GNUNET_MESSAGE_TYPE_STREAM_HELLO,
2612 sizeof (struct GNUNET_STREAM_MessageHeader)},
2613 {&server_handle_hello_ack, GNUNET_MESSAGE_TYPE_STREAM_HELLO_ACK,
2614 sizeof (struct GNUNET_STREAM_HelloAckMessage)},
2615 {&server_handle_reset, GNUNET_MESSAGE_TYPE_STREAM_RESET,
2616 sizeof (struct GNUNET_STREAM_MessageHeader)},
2617 {&server_handle_transmit_close, GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE,
2618 sizeof (struct GNUNET_STREAM_MessageHeader)},
2619 {&server_handle_transmit_close_ack, GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE_ACK,
2620 sizeof (struct GNUNET_STREAM_MessageHeader)},
2621 {&server_handle_receive_close, GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE,
2622 sizeof (struct GNUNET_STREAM_MessageHeader)},
2623 {&server_handle_receive_close_ack, GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE_ACK,
2624 sizeof (struct GNUNET_STREAM_MessageHeader)},
2625 {&server_handle_close, GNUNET_MESSAGE_TYPE_STREAM_CLOSE,
2626 sizeof (struct GNUNET_STREAM_MessageHeader)},
2627 {&server_handle_close_ack, GNUNET_MESSAGE_TYPE_STREAM_CLOSE_ACK,
2628 sizeof (struct GNUNET_STREAM_MessageHeader)},
2634 * Function called when our target peer is connected to our tunnel
2636 * @param cls the socket for which this tunnel is created
2637 * @param peer the peer identity of the target
2638 * @param atsi performance data for the connection
2641 mesh_peer_connect_callback (void *cls,
2642 const struct GNUNET_PeerIdentity *peer,
2643 const struct GNUNET_ATS_Information * atsi)
2645 struct GNUNET_STREAM_Socket *socket = cls;
2646 struct GNUNET_STREAM_MessageHeader *message;
2648 if (0 != memcmp (peer,
2649 &socket->other_peer,
2650 sizeof (struct GNUNET_PeerIdentity)))
2652 LOG (GNUNET_ERROR_TYPE_DEBUG,
2653 "%s: A peer which is not our target has connected to our tunnel\n",
2658 LOG (GNUNET_ERROR_TYPE_DEBUG,
2659 "%s: Target peer %s connected\n",
2660 GNUNET_i2s (&socket->other_peer),
2661 GNUNET_i2s (&socket->other_peer));
2663 /* Set state to INIT */
2664 socket->state = STATE_INIT;
2666 /* Send HELLO message */
2667 message = GNUNET_malloc (sizeof (struct GNUNET_STREAM_MessageHeader));
2668 message->header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_HELLO);
2669 message->header.size = htons (sizeof (struct GNUNET_STREAM_MessageHeader));
2670 queue_message (socket,
2672 &set_state_hello_wait,
2675 /* Call open callback */
2676 if (NULL == socket->open_cb)
2678 LOG (GNUNET_ERROR_TYPE_DEBUG,
2679 "STREAM_open callback is NULL\n");
2685 * Function called when our target peer is disconnected from our tunnel
2687 * @param cls the socket associated which this tunnel
2688 * @param peer the peer identity of the target
2691 mesh_peer_disconnect_callback (void *cls,
2692 const struct GNUNET_PeerIdentity *peer)
2694 struct GNUNET_STREAM_Socket *socket=cls;
2696 /* If the state is SHUTDOWN its ok; else set the state of the socket to SYSERR */
2697 LOG (GNUNET_ERROR_TYPE_DEBUG,
2698 "%s: Other peer %s disconnected \n",
2699 GNUNET_i2s (&socket->other_peer),
2700 GNUNET_i2s (&socket->other_peer));
2705 * Method called whenever a peer creates a tunnel to us
2707 * @param cls closure
2708 * @param tunnel new handle to the tunnel
2709 * @param initiator peer that started the tunnel
2710 * @param atsi performance information for the tunnel
2711 * @return initial tunnel context for the tunnel
2712 * (can be NULL -- that's not an error)
2715 new_tunnel_notify (void *cls,
2716 struct GNUNET_MESH_Tunnel *tunnel,
2717 const struct GNUNET_PeerIdentity *initiator,
2718 const struct GNUNET_ATS_Information *atsi)
2720 struct GNUNET_STREAM_ListenSocket *lsocket = cls;
2721 struct GNUNET_STREAM_Socket *socket;
2723 /* FIXME: If a tunnel is already created, we should not accept new tunnels
2724 from the same peer again until the socket is closed */
2726 if (GNUNET_NO == lsocket->listening)
2728 LOG (GNUNET_ERROR_TYPE_DEBUG,
2729 "%s: Destroying tunnel from peer %s as we don't have the lock\n",
2730 GNUNET_i2s (&socket->other_peer),
2731 GNUNET_i2s (&socket->other_peer));
2732 GNUNET_MESH_tunnel_destroy (tunnel);
2735 socket = GNUNET_malloc (sizeof (struct GNUNET_STREAM_Socket));
2736 socket->other_peer = *initiator;
2737 socket->tunnel = tunnel;
2738 socket->session_id = 0; /* FIXME */
2739 socket->state = STATE_INIT;
2740 socket->lsocket = lsocket;
2741 socket->retransmit_timeout = lsocket->retransmit_timeout;
2742 socket->testing_active = lsocket->testing_active;
2743 socket->testing_set_write_sequence_number_value =
2744 lsocket->testing_set_write_sequence_number_value;
2746 LOG (GNUNET_ERROR_TYPE_DEBUG,
2747 "%s: Peer %s initiated tunnel to us\n",
2748 GNUNET_i2s (&socket->other_peer),
2749 GNUNET_i2s (&socket->other_peer));
2751 /* FIXME: Copy MESH handle from lsocket to socket */
2758 * Function called whenever an inbound tunnel is destroyed. Should clean up
2759 * any associated state. This function is NOT called if the client has
2760 * explicitly asked for the tunnel to be destroyed using
2761 * GNUNET_MESH_tunnel_destroy. It must NOT call GNUNET_MESH_tunnel_destroy on
2764 * @param cls closure (set from GNUNET_MESH_connect)
2765 * @param tunnel connection to the other end (henceforth invalid)
2766 * @param tunnel_ctx place where local state associated
2767 * with the tunnel is stored
2770 tunnel_cleaner (void *cls,
2771 const struct GNUNET_MESH_Tunnel *tunnel,
2774 struct GNUNET_STREAM_Socket *socket = tunnel_ctx;
2776 if (tunnel != socket->tunnel)
2780 LOG (GNUNET_ERROR_TYPE_DEBUG,
2781 "%s: Peer %s has terminated connection abruptly\n",
2782 GNUNET_i2s (&socket->other_peer),
2783 GNUNET_i2s (&socket->other_peer));
2785 socket->status = GNUNET_STREAM_SHUTDOWN;
2787 /* Clear Transmit handles */
2788 if (NULL != socket->transmit_handle)
2790 GNUNET_MESH_notify_transmit_ready_cancel (socket->transmit_handle);
2791 socket->transmit_handle = NULL;
2793 if (NULL != socket->ack_transmit_handle)
2795 GNUNET_MESH_notify_transmit_ready_cancel (socket->ack_transmit_handle);
2796 GNUNET_free (socket->ack_msg);
2797 socket->ack_msg = NULL;
2798 socket->ack_transmit_handle = NULL;
2800 /* Stop Tasks using socket->tunnel */
2801 if (GNUNET_SCHEDULER_NO_TASK != socket->ack_task_id)
2803 GNUNET_SCHEDULER_cancel (socket->ack_task_id);
2804 socket->ack_task_id = GNUNET_SCHEDULER_NO_TASK;
2806 if (GNUNET_SCHEDULER_NO_TASK != socket->retransmission_timeout_task_id)
2808 GNUNET_SCHEDULER_cancel (socket->retransmission_timeout_task_id);
2809 socket->retransmission_timeout_task_id = GNUNET_SCHEDULER_NO_TASK;
2811 /* FIXME: Cancel all other tasks using socket->tunnel */
2812 socket->tunnel = NULL;
2817 * Callback to signal timeout on lockmanager lock acquire
2819 * @param cls the ListenSocket
2820 * @param tc the scheduler task context
2823 lockmanager_acquire_timeout (void *cls,
2824 const struct GNUNET_SCHEDULER_TaskContext *tc)
2826 struct GNUNET_STREAM_ListenSocket *lsocket = cls;
2827 GNUNET_STREAM_ListenCallback listen_cb;
2828 void *listen_cb_cls;
2830 lsocket->lockmanager_acquire_timeout_task = GNUNET_SCHEDULER_NO_TASK;
2831 listen_cb = lsocket->listen_cb;
2832 listen_cb_cls = lsocket->listen_cb_cls;
2833 GNUNET_STREAM_listen_close (lsocket);
2834 if (NULL != listen_cb)
2835 listen_cb (listen_cb_cls, NULL, NULL);
2840 * Callback to notify us on the status changes on app_port lock
2842 * @param cls the ListenSocket
2843 * @param domain the domain name of the lock
2844 * @param lock the app_port
2845 * @param status the current status of the lock
2848 lock_status_change_cb (void *cls, const char *domain, uint32_t lock,
2849 enum GNUNET_LOCKMANAGER_Status status)
2851 struct GNUNET_STREAM_ListenSocket *lsocket = cls;
2853 GNUNET_assert (lock == (uint32_t) lsocket->port);
2854 if (GNUNET_LOCKMANAGER_SUCCESS == status)
2856 lsocket->listening = GNUNET_YES;
2857 if (GNUNET_SCHEDULER_NO_TASK != lsocket->lockmanager_acquire_timeout_task)
2859 GNUNET_SCHEDULER_cancel (lsocket->lockmanager_acquire_timeout_task);
2860 lsocket->lockmanager_acquire_timeout_task = GNUNET_SCHEDULER_NO_TASK;
2862 if (NULL == lsocket->mesh)
2864 GNUNET_MESH_ApplicationType ports[] = {lsocket->port, 0};
2866 lsocket->mesh = GNUNET_MESH_connect (lsocket->cfg,
2867 RECEIVE_BUFFER_SIZE, /* FIXME: QUEUE size as parameter? */
2868 lsocket, /* Closure */
2871 server_message_handlers,
2873 GNUNET_assert (NULL != lsocket->mesh);
2876 if (GNUNET_LOCKMANAGER_RELEASE == status)
2877 lsocket->listening = GNUNET_NO;
2887 * Tries to open a stream to the target peer
2889 * @param cfg configuration to use
2890 * @param target the target peer to which the stream has to be opened
2891 * @param app_port the application port number which uniquely identifies this
2893 * @param open_cb this function will be called after stream has be established
2894 * @param open_cb_cls the closure for open_cb
2895 * @param ... options to the stream, terminated by GNUNET_STREAM_OPTION_END
2896 * @return if successful it returns the stream socket; NULL if stream cannot be
2899 struct GNUNET_STREAM_Socket *
2900 GNUNET_STREAM_open (const struct GNUNET_CONFIGURATION_Handle *cfg,
2901 const struct GNUNET_PeerIdentity *target,
2902 GNUNET_MESH_ApplicationType app_port,
2903 GNUNET_STREAM_OpenCallback open_cb,
2907 struct GNUNET_STREAM_Socket *socket;
2908 enum GNUNET_STREAM_Option option;
2909 GNUNET_MESH_ApplicationType ports[] = {app_port, 0};
2910 va_list vargs; /* Variable arguments */
2912 LOG (GNUNET_ERROR_TYPE_DEBUG,
2914 socket = GNUNET_malloc (sizeof (struct GNUNET_STREAM_Socket));
2915 socket->other_peer = *target;
2916 socket->open_cb = open_cb;
2917 socket->open_cls = open_cb_cls;
2919 socket->retransmit_timeout =
2920 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, default_timeout);
2921 socket->testing_active = GNUNET_NO;
2922 va_start (vargs, open_cb_cls); /* Parse variable args */
2924 option = va_arg (vargs, enum GNUNET_STREAM_Option);
2927 case GNUNET_STREAM_OPTION_INITIAL_RETRANSMIT_TIMEOUT:
2928 /* Expect struct GNUNET_TIME_Relative */
2929 socket->retransmit_timeout = va_arg (vargs,
2930 struct GNUNET_TIME_Relative);
2932 case GNUNET_STREAM_OPTION_TESTING_SET_WRITE_SEQUENCE_NUMBER:
2933 socket->testing_active = GNUNET_YES;
2934 socket->testing_set_write_sequence_number_value = va_arg (vargs,
2937 case GNUNET_STREAM_OPTION_END:
2940 } while (GNUNET_STREAM_OPTION_END != option);
2941 va_end (vargs); /* End of variable args parsing */
2942 socket->mesh = GNUNET_MESH_connect (cfg, /* the configuration handle */
2943 RECEIVE_BUFFER_SIZE, /* QUEUE size as parameter? */
2945 NULL, /* No inbound tunnel handler */
2946 NULL, /* No in-tunnel cleaner */
2947 client_message_handlers,
2948 ports); /* We don't get inbound tunnels */
2949 if (NULL == socket->mesh) /* Fail if we cannot connect to mesh */
2951 GNUNET_free (socket);
2955 /* Now create the mesh tunnel to target */
2956 LOG (GNUNET_ERROR_TYPE_DEBUG,
2957 "Creating MESH Tunnel\n");
2958 socket->tunnel = GNUNET_MESH_tunnel_create (socket->mesh,
2959 NULL, /* Tunnel context */
2960 &mesh_peer_connect_callback,
2961 &mesh_peer_disconnect_callback,
2963 GNUNET_assert (NULL != socket->tunnel);
2964 GNUNET_MESH_peer_request_connect_add (socket->tunnel,
2965 &socket->other_peer);
2967 LOG (GNUNET_ERROR_TYPE_DEBUG,
2968 "%s() END\n", __func__);
2974 * Shutdown the stream for reading or writing (similar to man 2 shutdown).
2976 * @param socket the stream socket
2977 * @param operation SHUT_RD, SHUT_WR or SHUT_RDWR
2978 * @param completion_cb the callback that will be called upon successful
2979 * shutdown of given operation
2980 * @param completion_cls the closure for the completion callback
2981 * @return the shutdown handle
2983 struct GNUNET_STREAM_ShutdownHandle *
2984 GNUNET_STREAM_shutdown (struct GNUNET_STREAM_Socket *socket,
2986 GNUNET_STREAM_ShutdownCompletion completion_cb,
2987 void *completion_cls)
2989 struct GNUNET_STREAM_ShutdownHandle *handle;
2990 struct GNUNET_STREAM_MessageHeader *msg;
2992 GNUNET_assert (NULL == socket->shutdown_handle);
2994 handle = GNUNET_malloc (sizeof (struct GNUNET_STREAM_ShutdownHandle));
2995 handle->socket = socket;
2996 handle->completion_cb = completion_cb;
2997 handle->completion_cls = completion_cls;
2998 socket->shutdown_handle = handle;
3000 msg = GNUNET_malloc (sizeof (struct GNUNET_STREAM_MessageHeader));
3001 msg->header.size = htons (sizeof (struct GNUNET_STREAM_MessageHeader));
3005 handle->operation = SHUT_RD;
3006 if (NULL != socket->read_handle)
3007 LOG (GNUNET_ERROR_TYPE_WARNING,
3008 "Existing read handle should be cancelled before shutting"
3010 msg->header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE);
3011 queue_message (socket,
3013 &set_state_receive_close_wait,
3017 handle->operation = SHUT_WR;
3018 if (NULL != socket->write_handle)
3019 LOG (GNUNET_ERROR_TYPE_WARNING,
3020 "Existing write handle should be cancelled before shutting"
3022 msg->header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE);
3023 queue_message (socket,
3025 &set_state_transmit_close_wait,
3029 handle->operation = SHUT_RDWR;
3030 if (NULL != socket->write_handle)
3031 LOG (GNUNET_ERROR_TYPE_WARNING,
3032 "Existing write handle should be cancelled before shutting"
3034 if (NULL != socket->read_handle)
3035 LOG (GNUNET_ERROR_TYPE_WARNING,
3036 "Existing read handle should be cancelled before shutting"
3038 msg->header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_CLOSE);
3039 queue_message (socket,
3041 &set_state_close_wait,
3045 LOG (GNUNET_ERROR_TYPE_WARNING,
3046 "GNUNET_STREAM_shutdown called with invalid value for "
3047 "parameter operation -- Ignoring\n");
3049 GNUNET_free (handle);
3052 handle->close_msg_retransmission_task_id =
3053 GNUNET_SCHEDULER_add_delayed (socket->retransmit_timeout,
3054 &close_msg_retransmission_task,
3061 * Cancels a pending shutdown
3063 * @param handle the shutdown handle returned from GNUNET_STREAM_shutdown
3066 GNUNET_STREAM_shutdown_cancel (struct GNUNET_STREAM_ShutdownHandle *handle)
3068 if (GNUNET_SCHEDULER_NO_TASK != handle->close_msg_retransmission_task_id)
3069 GNUNET_SCHEDULER_cancel (handle->close_msg_retransmission_task_id);
3070 GNUNET_free (handle);
3078 * @param socket the stream socket
3081 GNUNET_STREAM_close (struct GNUNET_STREAM_Socket *socket)
3083 struct MessageQueue *head;
3085 if (NULL != socket->read_handle)
3087 LOG (GNUNET_ERROR_TYPE_WARNING,
3088 "Closing STREAM socket when a read handle is pending\n");
3090 if (NULL != socket->write_handle)
3092 LOG (GNUNET_ERROR_TYPE_WARNING,
3093 "Closing STREAM socket when a write handle is pending\n");
3094 GNUNET_STREAM_io_write_cancel (socket->write_handle);
3095 //socket->write_handle = NULL;
3098 if (socket->read_task_id != GNUNET_SCHEDULER_NO_TASK)
3100 /* socket closed with read task pending!? */
3102 GNUNET_SCHEDULER_cancel (socket->read_task_id);
3103 socket->read_task_id = GNUNET_SCHEDULER_NO_TASK;
3106 /* Terminate the ack'ing tasks if they are still present */
3107 if (socket->ack_task_id != GNUNET_SCHEDULER_NO_TASK)
3109 GNUNET_SCHEDULER_cancel (socket->ack_task_id);
3110 socket->ack_task_id = GNUNET_SCHEDULER_NO_TASK;
3113 /* Clear Transmit handles */
3114 if (NULL != socket->transmit_handle)
3116 GNUNET_MESH_notify_transmit_ready_cancel (socket->transmit_handle);
3117 socket->transmit_handle = NULL;
3119 if (NULL != socket->ack_transmit_handle)
3121 GNUNET_MESH_notify_transmit_ready_cancel (socket->ack_transmit_handle);
3122 GNUNET_free (socket->ack_msg);
3123 socket->ack_msg = NULL;
3124 socket->ack_transmit_handle = NULL;
3127 /* Clear existing message queue */
3128 while (NULL != (head = socket->queue_head)) {
3129 GNUNET_CONTAINER_DLL_remove (socket->queue_head,
3132 GNUNET_free (head->message);
3136 /* Close associated tunnel */
3137 if (NULL != socket->tunnel)
3139 GNUNET_MESH_tunnel_destroy (socket->tunnel);
3140 socket->tunnel = NULL;
3143 /* Close mesh connection */
3144 if (NULL != socket->mesh && NULL == socket->lsocket)
3146 GNUNET_MESH_disconnect (socket->mesh);
3147 socket->mesh = NULL;
3150 /* Release receive buffer */
3151 if (NULL != socket->receive_buffer)
3153 GNUNET_free (socket->receive_buffer);
3156 GNUNET_free (socket);
3161 * Listens for stream connections for a specific application ports
3163 * @param cfg the configuration to use
3164 * @param app_port the application port for which new streams will be accepted
3165 * @param listen_cb this function will be called when a peer tries to establish
3167 * @param listen_cb_cls closure for listen_cb
3168 * @param ... options to the stream, terminated by GNUNET_STREAM_OPTION_END
3169 * @return listen socket, NULL for any error
3171 struct GNUNET_STREAM_ListenSocket *
3172 GNUNET_STREAM_listen (const struct GNUNET_CONFIGURATION_Handle *cfg,
3173 GNUNET_MESH_ApplicationType app_port,
3174 GNUNET_STREAM_ListenCallback listen_cb,
3175 void *listen_cb_cls,
3178 /* FIXME: Add variable args for passing configration options? */
3179 struct GNUNET_STREAM_ListenSocket *lsocket;
3180 enum GNUNET_STREAM_Option option;
3183 lsocket = GNUNET_malloc (sizeof (struct GNUNET_STREAM_ListenSocket));
3184 lsocket->cfg = GNUNET_CONFIGURATION_dup (cfg);
3185 lsocket->lockmanager = GNUNET_LOCKMANAGER_connect (lsocket->cfg);
3186 if (NULL == lsocket->lockmanager)
3188 GNUNET_CONFIGURATION_destroy (lsocket->cfg);
3189 GNUNET_free (lsocket);
3192 lsocket->listening = GNUNET_NO;/* We listen when we get a lock on app_port */
3194 lsocket->retransmit_timeout =
3195 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, default_timeout);
3196 lsocket->testing_active = GNUNET_NO;
3197 va_start (vargs, listen_cb_cls);
3199 option = va_arg (vargs, enum GNUNET_STREAM_Option);
3202 case GNUNET_STREAM_OPTION_INITIAL_RETRANSMIT_TIMEOUT:
3203 lsocket->retransmit_timeout = va_arg (vargs,
3204 struct GNUNET_TIME_Relative);
3206 case GNUNET_STREAM_OPTION_TESTING_SET_WRITE_SEQUENCE_NUMBER:
3207 lsocket->testing_active = GNUNET_YES;
3208 lsocket->testing_set_write_sequence_number_value = va_arg (vargs,
3211 case GNUNET_STREAM_OPTION_END:
3214 } while (GNUNET_STREAM_OPTION_END != option);
3216 lsocket->port = app_port;
3217 lsocket->listen_cb = listen_cb;
3218 lsocket->listen_cb_cls = listen_cb_cls;
3219 lsocket->locking_request =
3220 GNUNET_LOCKMANAGER_acquire_lock (lsocket->lockmanager, locking_domain,
3221 (uint32_t) lsocket->port,
3222 &lock_status_change_cb, lsocket);
3223 lsocket->lockmanager_acquire_timeout_task =
3224 GNUNET_SCHEDULER_add_delayed (TIME_REL_SECS (20),
3225 &lockmanager_acquire_timeout, lsocket);
3231 * Closes the listen socket
3233 * @param lsocket the listen socket
3236 GNUNET_STREAM_listen_close (struct GNUNET_STREAM_ListenSocket *lsocket)
3238 /* Close MESH connection */
3239 if (NULL != lsocket->mesh)
3240 GNUNET_MESH_disconnect (lsocket->mesh);
3241 GNUNET_CONFIGURATION_destroy (lsocket->cfg);
3242 if (GNUNET_SCHEDULER_NO_TASK != lsocket->lockmanager_acquire_timeout_task)
3243 GNUNET_SCHEDULER_cancel (lsocket->lockmanager_acquire_timeout_task);
3244 if (NULL != lsocket->locking_request)
3245 GNUNET_LOCKMANAGER_cancel_request (lsocket->locking_request);
3246 if (NULL != lsocket->lockmanager)
3247 GNUNET_LOCKMANAGER_disconnect (lsocket->lockmanager);
3248 GNUNET_free (lsocket);
3253 * Tries to write the given data to the stream. The maximum size of data that
3254 * can be written as part of a write operation is (64 * (64000 - sizeof (struct
3255 * GNUNET_STREAM_DataMessage))). If size is greater than this it is not an API
3256 * violation, however only the said number of maximum bytes will be written.
3258 * @param socket the socket representing a stream
3259 * @param data the data buffer from where the data is written into the stream
3260 * @param size the number of bytes to be written from the data buffer
3261 * @param timeout the timeout period
3262 * @param write_cont the function to call upon writing some bytes into the
3264 * @param write_cont_cls the closure
3266 * @return handle to cancel the operation; if a previous write is pending or
3267 * the stream has been shutdown for this operation then write_cont is
3268 * immediately called and NULL is returned.
3270 struct GNUNET_STREAM_IOWriteHandle *
3271 GNUNET_STREAM_write (struct GNUNET_STREAM_Socket *socket,
3274 struct GNUNET_TIME_Relative timeout,
3275 GNUNET_STREAM_CompletionContinuation write_cont,
3276 void *write_cont_cls)
3278 unsigned int num_needed_packets;
3279 unsigned int packet;
3280 struct GNUNET_STREAM_IOWriteHandle *io_handle;
3281 uint32_t packet_size;
3282 uint32_t payload_size;
3283 struct GNUNET_STREAM_DataMessage *data_msg;
3285 struct GNUNET_TIME_Relative ack_deadline;
3287 LOG (GNUNET_ERROR_TYPE_DEBUG,
3290 /* Return NULL if there is already a write request pending */
3291 if (NULL != socket->write_handle)
3297 switch (socket->state)
3299 case STATE_TRANSMIT_CLOSED:
3300 case STATE_TRANSMIT_CLOSE_WAIT:
3302 case STATE_CLOSE_WAIT:
3303 if (NULL != write_cont)
3304 write_cont (write_cont_cls, GNUNET_STREAM_SHUTDOWN, 0);
3305 LOG (GNUNET_ERROR_TYPE_DEBUG,
3306 "%s() END\n", __func__);
3310 case STATE_HELLO_WAIT:
3311 if (NULL != write_cont)
3312 /* FIXME: GNUNET_STREAM_SYSERR?? */
3313 write_cont (write_cont_cls, GNUNET_STREAM_SYSERR, 0);
3314 LOG (GNUNET_ERROR_TYPE_DEBUG,
3315 "%s() END\n", __func__);
3317 case STATE_ESTABLISHED:
3318 case STATE_RECEIVE_CLOSED:
3319 case STATE_RECEIVE_CLOSE_WAIT:
3323 if (GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH * max_payload_size < size)
3324 size = GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH * max_payload_size;
3325 num_needed_packets = (size + (max_payload_size - 1)) / max_payload_size;
3326 io_handle = GNUNET_malloc (sizeof (struct GNUNET_STREAM_IOWriteHandle));
3327 io_handle->socket = socket;
3328 io_handle->write_cont = write_cont;
3329 io_handle->write_cont_cls = write_cont_cls;
3330 io_handle->size = size;
3332 /* FIXME: Remove the fixed delay for ack deadline; Set it to the value
3333 determined from RTT */
3334 ack_deadline = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5);
3335 /* Divide the given buffer into packets for sending */
3336 for (packet=0; packet < num_needed_packets; packet++)
3338 if ((packet + 1) * max_payload_size < size)
3340 payload_size = max_payload_size;
3341 packet_size = MAX_PACKET_SIZE;
3345 payload_size = size - packet * max_payload_size;
3346 packet_size = payload_size + sizeof (struct
3347 GNUNET_STREAM_DataMessage);
3349 io_handle->messages[packet] = GNUNET_malloc (packet_size);
3350 io_handle->messages[packet]->header.header.size = htons (packet_size);
3351 io_handle->messages[packet]->header.header.type =
3352 htons (GNUNET_MESSAGE_TYPE_STREAM_DATA);
3353 io_handle->messages[packet]->sequence_number =
3354 htonl (socket->write_sequence_number++);
3355 io_handle->messages[packet]->offset = htonl (socket->write_offset);
3357 /* FIXME: Remove the fixed delay for ack deadline; Set it to the value
3358 determined from RTT */
3359 io_handle->messages[packet]->ack_deadline =
3360 GNUNET_TIME_relative_hton (ack_deadline);
3361 data_msg = io_handle->messages[packet];
3362 /* Copy data from given buffer to the packet */
3363 memcpy (&data_msg[1],
3366 sweep += payload_size;
3367 socket->write_offset += payload_size;
3369 socket->write_handle = io_handle;
3370 write_data (socket);
3372 LOG (GNUNET_ERROR_TYPE_DEBUG,
3373 "%s() END\n", __func__);
3381 * Tries to read data from the stream.
3383 * @param socket the socket representing a stream
3384 * @param timeout the timeout period
3385 * @param proc function to call with data (once only)
3386 * @param proc_cls the closure for proc
3388 * @return handle to cancel the operation; if the stream has been shutdown for
3389 * this type of opeartion then the DataProcessor is immediately
3390 * called with GNUNET_STREAM_SHUTDOWN as status and NULL if returned
3392 struct GNUNET_STREAM_IOReadHandle *
3393 GNUNET_STREAM_read (struct GNUNET_STREAM_Socket *socket,
3394 struct GNUNET_TIME_Relative timeout,
3395 GNUNET_STREAM_DataProcessor proc,
3398 struct GNUNET_STREAM_IOReadHandle *read_handle;
3400 LOG (GNUNET_ERROR_TYPE_DEBUG,
3402 GNUNET_i2s (&socket->other_peer),
3405 /* Return NULL if there is already a read handle; the user has to cancel that
3406 first before continuing or has to wait until it is completed */
3407 if (NULL != socket->read_handle) return NULL;
3409 GNUNET_assert (NULL != proc);
3411 switch (socket->state)
3413 case STATE_RECEIVE_CLOSED:
3414 case STATE_RECEIVE_CLOSE_WAIT:
3416 case STATE_CLOSE_WAIT:
3417 proc (proc_cls, GNUNET_STREAM_SHUTDOWN, NULL, 0);
3418 LOG (GNUNET_ERROR_TYPE_DEBUG,
3420 GNUNET_i2s (&socket->other_peer),
3427 read_handle = GNUNET_malloc (sizeof (struct GNUNET_STREAM_IOReadHandle));
3428 read_handle->proc = proc;
3429 read_handle->proc_cls = proc_cls;
3430 socket->read_handle = read_handle;
3432 /* Check if we have a packet at bitmap 0 */
3433 if (GNUNET_YES == ackbitmap_is_bit_set (&socket->ack_bitmap,
3436 socket->read_task_id = GNUNET_SCHEDULER_add_now (&call_read_processor,
3441 /* Setup the read timeout task */
3442 socket->read_io_timeout_task_id =
3443 GNUNET_SCHEDULER_add_delayed (timeout,
3446 LOG (GNUNET_ERROR_TYPE_DEBUG,
3448 GNUNET_i2s (&socket->other_peer),
3455 * Cancel pending write operation.
3457 * @param ioh handle to operation to cancel
3460 GNUNET_STREAM_io_write_cancel (struct GNUNET_STREAM_IOWriteHandle *ioh)
3462 struct GNUNET_STREAM_Socket *socket = ioh->socket;
3463 unsigned int packet;
3465 GNUNET_assert (NULL != socket->write_handle);
3466 GNUNET_assert (socket->write_handle == ioh);
3468 if (GNUNET_SCHEDULER_NO_TASK != socket->retransmission_timeout_task_id)
3470 GNUNET_SCHEDULER_cancel (socket->retransmission_timeout_task_id);
3471 socket->retransmission_timeout_task_id = GNUNET_SCHEDULER_NO_TASK;
3474 for (packet=0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
3476 if (NULL == ioh->messages[packet]) break;
3477 GNUNET_free (ioh->messages[packet]);
3480 GNUNET_free (socket->write_handle);
3481 socket->write_handle = NULL;
3487 * Cancel pending read operation.
3489 * @param ioh handle to operation to cancel
3492 GNUNET_STREAM_io_read_cancel (struct GNUNET_STREAM_IOReadHandle *ioh)