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"
46 * Generic logging shorthand
48 #define LOG(kind,...) \
49 GNUNET_log_from (kind, "stream-api", __VA_ARGS__)
52 * Debug logging shorthand
54 #define LOG_DEBUG(...) \
55 LOG (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
58 * Time in relative seconds shorthand
60 #define TIME_REL_SECS(sec) \
61 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, sec)
64 * The maximum packet size of a stream packet
66 #define DEFAULT_MAX_PAYLOAD_SIZE 64000
71 #define RECEIVE_BUFFER_SIZE 4096000
74 * states in the Protocol
79 * Client initialization state
84 * Listener initialization state
89 * Pre-connection establishment state
94 * State where a connection has been established
99 * State where the socket is closed on our side and waiting to be ACK'ed
101 STATE_RECEIVE_CLOSE_WAIT,
104 * State where the socket is closed for reading
106 STATE_RECEIVE_CLOSED,
109 * State where the socket is closed on our side and waiting to be ACK'ed
111 STATE_TRANSMIT_CLOSE_WAIT,
114 * State where the socket is closed for writing
116 STATE_TRANSMIT_CLOSED,
119 * State where the socket is closed on our side and waiting to be ACK'ed
124 * State where the socket is closed
131 * Functions of this type are called when a message is written
133 * @param cls the closure from queue_message
134 * @param socket the socket the written message was bound to
136 typedef void (*SendFinishCallback) (void *cls,
137 struct GNUNET_STREAM_Socket *socket);
141 * The send message queue
148 struct GNUNET_STREAM_MessageHeader *message;
151 * Callback to be called when the message is sent
153 SendFinishCallback finish_cb;
156 * The closure for finish_cb
161 * The next message in queue. Should be NULL in the last message
163 struct MessageQueue *next;
166 * The next message in queue. Should be NULL in the first message
168 struct MessageQueue *prev;
173 * The STREAM Socket Handler
175 struct GNUNET_STREAM_Socket
178 * Retransmission timeout
180 struct GNUNET_TIME_Relative retransmit_timeout;
183 * The Acknowledgement Bitmap
185 GNUNET_STREAM_AckBitmap ack_bitmap;
188 * Time when the Acknowledgement was queued
190 struct GNUNET_TIME_Absolute ack_time_registered;
193 * Queued Acknowledgement deadline
195 struct GNUNET_TIME_Relative ack_time_deadline;
200 struct GNUNET_MESH_Handle *mesh;
203 * The mesh tunnel handle
205 struct GNUNET_MESH_Tunnel *tunnel;
208 * Stream open closure
213 * Stream open callback
215 GNUNET_STREAM_OpenCallback open_cb;
218 * The current transmit handle (if a pending transmit request exists)
220 struct GNUNET_MESH_TransmitHandle *transmit_handle;
223 * The current message associated with the transmit handle
225 struct MessageQueue *queue_head;
228 * The queue tail, should always point to the last message in queue
230 struct MessageQueue *queue_tail;
233 * The write IO_handle associated with this socket
235 struct GNUNET_STREAM_IOWriteHandle *write_handle;
238 * The read IO_handle associated with this socket
240 struct GNUNET_STREAM_IOReadHandle *read_handle;
243 * The shutdown handle associated with this socket
245 struct GNUNET_STREAM_ShutdownHandle *shutdown_handle;
248 * Buffer for storing received messages
250 void *receive_buffer;
253 * The listen socket from which this socket is derived. Should be NULL if it
254 * is not a derived socket
256 struct GNUNET_STREAM_ListenSocket *lsocket;
259 * The peer identity of the peer at the other end of the stream
261 struct GNUNET_PeerIdentity other_peer;
264 * Task identifier for the read io timeout task
266 GNUNET_SCHEDULER_TaskIdentifier read_io_timeout_task_id;
269 * Task identifier for retransmission task after timeout
271 GNUNET_SCHEDULER_TaskIdentifier data_retransmission_task_id;
274 * Task identifier for retransmission of control messages
276 GNUNET_SCHEDULER_TaskIdentifier control_retransmission_task_id;
279 * The task for sending timely Acks
281 GNUNET_SCHEDULER_TaskIdentifier ack_task_id;
284 * Task scheduled to continue a read operation.
286 GNUNET_SCHEDULER_TaskIdentifier read_task_id;
289 * The state of the protocol associated with this socket
294 * The status of the socket
296 enum GNUNET_STREAM_Status status;
299 * The number of previous timeouts; FIXME: currently not used
301 unsigned int retries;
304 * The application port number (type: uint32_t)
306 GNUNET_MESH_ApplicationType app_port;
309 * Whether testing mode is active or not
314 * The write sequence number to be set incase of testing
316 uint32_t testing_set_write_sequence_number_value;
319 * The session id associated with this stream connection
320 * FIXME: Not used currently, may be removed
325 * Write sequence number. Set to random when sending HELLO(client) and
328 uint32_t write_sequence_number;
331 * Read sequence number. This number's value is determined during handshake
333 uint32_t read_sequence_number;
336 * The receiver buffer size
338 uint32_t receive_buffer_size;
341 * The receiver buffer boundaries
343 uint32_t receive_buffer_boundaries[GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH];
346 * receiver's available buffer after the last acknowledged packet
348 uint32_t receiver_window_available;
351 * The offset pointer used during write operation
353 uint32_t write_offset;
356 * The offset after which we are expecting data
358 uint32_t read_offset;
361 * The offset upto which user has read from the received buffer
363 uint32_t copy_offset;
366 * The maximum size of the data message payload this stream handle can send
368 uint16_t max_payload_size;
373 * A socket for listening
375 struct GNUNET_STREAM_ListenSocket
380 struct GNUNET_MESH_Handle *mesh;
385 struct GNUNET_CONFIGURATION_Handle *cfg;
388 * Handle to the lock manager service
390 struct GNUNET_LOCKMANAGER_Handle *lockmanager;
393 * The active LockingRequest from lockmanager
395 struct GNUNET_LOCKMANAGER_LockingRequest *locking_request;
398 * Callback to call after acquring a lock and listening
400 GNUNET_STREAM_ListenSuccessCallback listen_ok_cb;
403 * The callback function which is called after successful opening socket
405 GNUNET_STREAM_ListenCallback listen_cb;
408 * The call back closure
415 GNUNET_MESH_ApplicationType port;
418 * The id of the lockmanager timeout task
420 GNUNET_SCHEDULER_TaskIdentifier lockmanager_acquire_timeout_task;
423 * The retransmit timeout
425 struct GNUNET_TIME_Relative retransmit_timeout;
433 * Whether testing mode is active or not
438 * The write sequence number to be set incase of testing
440 uint32_t testing_set_write_sequence_number_value;
443 * The maximum size of the data message payload this stream handle can send
445 uint16_t max_payload_size;
451 * The IO Write Handle
453 struct GNUNET_STREAM_IOWriteHandle
456 * The socket to which this write handle is associated
458 struct GNUNET_STREAM_Socket *socket;
461 * The packet_buffers associated with this Handle
463 struct GNUNET_STREAM_DataMessage *messages[GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH];
466 * The write continuation callback
468 GNUNET_STREAM_CompletionContinuation write_cont;
471 * Write continuation closure
473 void *write_cont_cls;
476 * The bitmap of this IOHandle; Corresponding bit for a message is set when
477 * it has been acknowledged by the receiver
479 GNUNET_STREAM_AckBitmap ack_bitmap;
482 * Number of bytes in this write handle
487 * Number of packets already transmitted from this IO handle. Retransmitted
488 * packets are not taken into account here. This is used to determine which
489 * packets account for retransmission and which packets occupy buffer space at
492 unsigned int packets_sent;
499 struct GNUNET_STREAM_IOReadHandle
502 * The socket to which this read handle is associated
504 struct GNUNET_STREAM_Socket *socket;
507 * Callback for the read processor
509 GNUNET_STREAM_DataProcessor proc;
512 * The closure pointer for the read processor callback
519 * Handle for Shutdown
521 struct GNUNET_STREAM_ShutdownHandle
524 * The socket associated with this shutdown handle
526 struct GNUNET_STREAM_Socket *socket;
529 * Shutdown completion callback
531 GNUNET_STREAM_ShutdownCompletion completion_cb;
534 * Closure for completion callback
536 void *completion_cls;
539 * Close message retransmission task id
541 GNUNET_SCHEDULER_TaskIdentifier close_msg_retransmission_task_id;
544 * Which operation to shutdown? SHUT_RD, SHUT_WR or SHUT_RDWR
551 * Default value in seconds for various timeouts
553 static const unsigned int default_timeout = 10;
556 * The domain name for locks we use here
558 static const char *locking_domain = "GNUNET_STREAM_APPLOCK";
562 * Callback function for sending queued message
564 * @param cls closure the socket
565 * @param size number of bytes available in buf
566 * @param buf where the callee should write the message
567 * @return number of bytes written to buf
570 send_message_notify (void *cls, size_t size, void *buf)
572 struct GNUNET_STREAM_Socket *socket = cls;
573 struct MessageQueue *head;
576 socket->transmit_handle = NULL; /* Remove the transmit handle */
577 head = socket->queue_head;
579 return 0; /* just to be safe */
580 if (0 == size) /* request timed out */
583 LOG (GNUNET_ERROR_TYPE_DEBUG,
584 "%s: Message sending timed out. Retry %d \n",
585 GNUNET_i2s (&socket->other_peer),
587 socket->transmit_handle =
588 GNUNET_MESH_notify_transmit_ready (socket->tunnel,
589 GNUNET_NO, /* Corking */
590 /* FIXME: exponential backoff */
591 socket->retransmit_timeout,
593 ntohs (head->message->header.size),
594 &send_message_notify,
598 ret = ntohs (head->message->header.size);
599 GNUNET_assert (size >= ret);
600 memcpy (buf, head->message, ret);
601 if (NULL != head->finish_cb)
603 head->finish_cb (head->finish_cb_cls, socket);
605 GNUNET_CONTAINER_DLL_remove (socket->queue_head,
608 GNUNET_free (head->message);
610 head = socket->queue_head;
611 if (NULL != head) /* more pending messages to send */
614 socket->transmit_handle =
615 GNUNET_MESH_notify_transmit_ready (socket->tunnel,
616 GNUNET_NO, /* Corking */
617 /* FIXME: exponential backoff */
618 socket->retransmit_timeout,
620 ntohs (head->message->header.size),
621 &send_message_notify,
629 * Queues a message for sending using the mesh connection of a socket
631 * @param socket the socket whose mesh connection is used
632 * @param message the message to be sent
633 * @param finish_cb the callback to be called when the message is sent
634 * @param finish_cb_cls the closure for the callback
635 * @param urgent set to GNUNET_YES to add the message to the beginning of the
636 * queue; GNUNET_NO to add at the tail
639 queue_message (struct GNUNET_STREAM_Socket *socket,
640 struct GNUNET_STREAM_MessageHeader *message,
641 SendFinishCallback finish_cb,
645 struct MessageQueue *queue_entity;
648 ((ntohs (message->header.type) >= GNUNET_MESSAGE_TYPE_STREAM_DATA)
649 && (ntohs (message->header.type) <= GNUNET_MESSAGE_TYPE_STREAM_CLOSE_ACK));
650 LOG (GNUNET_ERROR_TYPE_DEBUG,
651 "%s: Queueing message of type %d and size %d\n",
652 GNUNET_i2s (&socket->other_peer),
653 ntohs (message->header.type),
654 ntohs (message->header.size));
655 GNUNET_assert (NULL != message);
656 queue_entity = GNUNET_malloc (sizeof (struct MessageQueue));
657 queue_entity->message = message;
658 queue_entity->finish_cb = finish_cb;
659 queue_entity->finish_cb_cls = finish_cb_cls;
660 if (GNUNET_YES == urgent)
662 GNUNET_CONTAINER_DLL_insert (socket->queue_head, socket->queue_tail,
664 if (NULL != socket->transmit_handle)
666 GNUNET_MESH_notify_transmit_ready_cancel (socket->transmit_handle);
667 socket->transmit_handle = NULL;
671 GNUNET_CONTAINER_DLL_insert_tail (socket->queue_head,
674 if (NULL == socket->transmit_handle)
677 socket->transmit_handle =
678 GNUNET_MESH_notify_transmit_ready (socket->tunnel,
679 GNUNET_NO, /* Corking */
680 socket->retransmit_timeout,
682 ntohs (message->header.size),
683 &send_message_notify,
690 * Copies a message and queues it for sending using the mesh connection of
693 * @param socket the socket whose mesh connection is used
694 * @param message the message to be sent
695 * @param finish_cb the callback to be called when the message is sent
696 * @param finish_cb_cls the closure for the callback
699 copy_and_queue_message (struct GNUNET_STREAM_Socket *socket,
700 const struct GNUNET_STREAM_MessageHeader *message,
701 SendFinishCallback finish_cb,
704 struct GNUNET_STREAM_MessageHeader *msg_copy;
707 size = ntohs (message->header.size);
708 msg_copy = GNUNET_malloc (size);
709 memcpy (msg_copy, message, size);
710 queue_message (socket, msg_copy, finish_cb, finish_cb_cls, GNUNET_NO);
715 * Writes data using the given socket. The amount of data written is limited by
716 * the receiver_window_size
718 * @param socket the socket to use
721 write_data (struct GNUNET_STREAM_Socket *socket);
725 * Task for retransmitting data messages if they aren't ACK before their ack
728 * @param cls the socket
729 * @param tc the Task context
732 data_retransmission_task (void *cls,
733 const struct GNUNET_SCHEDULER_TaskContext *tc)
735 struct GNUNET_STREAM_Socket *socket = cls;
737 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
739 LOG (GNUNET_ERROR_TYPE_DEBUG,
740 "%s: Retransmitting DATA...\n", GNUNET_i2s (&socket->other_peer));
741 socket->data_retransmission_task_id = GNUNET_SCHEDULER_NO_TASK;
747 * Task for sending ACK message
749 * @param cls the socket
750 * @param tc the Task context
754 const struct GNUNET_SCHEDULER_TaskContext *tc)
756 struct GNUNET_STREAM_Socket *socket = cls;
757 struct GNUNET_STREAM_AckMessage *ack_msg;
759 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
763 socket->ack_task_id = GNUNET_SCHEDULER_NO_TASK;
764 /* Create the ACK Message */
765 ack_msg = GNUNET_malloc (sizeof (struct GNUNET_STREAM_AckMessage));
766 ack_msg->header.header.size = htons (sizeof (struct
767 GNUNET_STREAM_AckMessage));
768 ack_msg->header.header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_ACK);
769 ack_msg->bitmap = GNUNET_htonll (socket->ack_bitmap);
770 ack_msg->base_sequence_number = htonl (socket->read_sequence_number);
771 ack_msg->receive_window_remaining =
772 htonl (RECEIVE_BUFFER_SIZE - socket->receive_buffer_size);
773 /* Queue up ACK for immediate sending */
774 queue_message (socket, &ack_msg->header, NULL, NULL, GNUNET_YES);
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, GNUNET_NO);
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;
870 for (packet=0; packet < io_handle->packets_sent; packet++)
872 if (GNUNET_NO == ackbitmap_is_bit_set (&io_handle->ack_bitmap,
875 LOG (GNUNET_ERROR_TYPE_DEBUG,
876 "%s: Retransmitting DATA message with sequence %u\n",
877 GNUNET_i2s (&socket->other_peer),
878 ntohl (io_handle->messages[packet]->sequence_number));
879 copy_and_queue_message (socket,
880 &io_handle->messages[packet]->header,
885 /* Now send new packets if there is enough buffer space */
886 while ( (NULL != io_handle->messages[packet]) &&
887 (socket->receiver_window_available
888 >= ntohs (io_handle->messages[packet]->header.header.size)) &&
889 (packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH))
891 socket->receiver_window_available -=
892 ntohs (io_handle->messages[packet]->header.header.size);
893 LOG (GNUNET_ERROR_TYPE_DEBUG,
894 "%s: Placing DATA message with sequence %u in send queue\n",
895 GNUNET_i2s (&socket->other_peer),
896 ntohl (io_handle->messages[packet]->sequence_number));
897 copy_and_queue_message (socket,
898 &io_handle->messages[packet]->header,
903 io_handle->packets_sent = packet;
904 if (GNUNET_SCHEDULER_NO_TASK == socket->data_retransmission_task_id)
905 socket->data_retransmission_task_id =
906 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
907 (GNUNET_TIME_UNIT_SECONDS, 8),
908 &data_retransmission_task,
914 * Task for calling the read processor
916 * @param cls the socket
917 * @param tc the task context
920 call_read_processor (void *cls,
921 const struct GNUNET_SCHEDULER_TaskContext *tc)
923 struct GNUNET_STREAM_Socket *socket = cls;
925 size_t valid_read_size;
927 uint32_t sequence_increase;
928 uint32_t offset_increase;
930 socket->read_task_id = GNUNET_SCHEDULER_NO_TASK;
931 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
934 if (NULL == socket->receive_buffer)
937 GNUNET_assert (NULL != socket->read_handle);
938 GNUNET_assert (NULL != socket->read_handle->proc);
940 /* Check the bitmap for any holes */
941 for (packet=0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
943 if (GNUNET_NO == ackbitmap_is_bit_set (&socket->ack_bitmap,
947 /* We only call read processor if we have the first packet */
948 GNUNET_assert (0 < packet);
950 socket->receive_buffer_boundaries[packet-1] - socket->copy_offset;
951 GNUNET_assert (0 != valid_read_size);
952 /* Cancel the read_io_timeout_task */
953 GNUNET_SCHEDULER_cancel (socket->read_io_timeout_task_id);
954 socket->read_io_timeout_task_id = GNUNET_SCHEDULER_NO_TASK;
955 /* Call the data processor */
956 LOG (GNUNET_ERROR_TYPE_DEBUG,
957 "%s: Calling read processor\n",
958 GNUNET_i2s (&socket->other_peer));
960 socket->read_handle->proc (socket->read_handle->proc_cls,
962 socket->receive_buffer + socket->copy_offset,
964 LOG (GNUNET_ERROR_TYPE_DEBUG,
965 "%s: Read processor read %d bytes\n",
966 GNUNET_i2s (&socket->other_peer), read_size);
967 LOG (GNUNET_ERROR_TYPE_DEBUG,
968 "%s: Read processor completed successfully\n",
969 GNUNET_i2s (&socket->other_peer));
970 /* Free the read handle */
971 GNUNET_free (socket->read_handle);
972 socket->read_handle = NULL;
973 GNUNET_assert (read_size <= valid_read_size);
974 socket->copy_offset += read_size;
975 /* Determine upto which packet we can remove from the buffer */
976 for (packet = 0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
978 if (socket->copy_offset == socket->receive_buffer_boundaries[packet])
980 if (socket->copy_offset < socket->receive_buffer_boundaries[packet])
984 /* If no packets can be removed we can't move the buffer */
985 if (0 == packet) return;
986 sequence_increase = packet;
987 LOG (GNUNET_ERROR_TYPE_DEBUG,
988 "%s: Sequence increase after read processor completion: %u\n",
989 GNUNET_i2s (&socket->other_peer), sequence_increase);
991 /* Shift the data in the receive buffer */
992 socket->receive_buffer =
993 memmove (socket->receive_buffer,
994 socket->receive_buffer
995 + socket->receive_buffer_boundaries[sequence_increase-1],
996 socket->receive_buffer_size
997 - socket->receive_buffer_boundaries[sequence_increase-1]);
998 /* Shift the bitmap */
999 socket->ack_bitmap = socket->ack_bitmap >> sequence_increase;
1000 /* Set read_sequence_number */
1001 socket->read_sequence_number += sequence_increase;
1002 /* Set read_offset */
1003 offset_increase = socket->receive_buffer_boundaries[sequence_increase-1];
1004 socket->read_offset += offset_increase;
1005 /* Fix copy_offset */
1006 GNUNET_assert (offset_increase <= socket->copy_offset);
1007 socket->copy_offset -= offset_increase;
1008 /* Fix relative boundaries */
1009 for (packet=0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
1011 if (packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH - sequence_increase)
1013 uint32_t ahead_buffer_boundary;
1015 ahead_buffer_boundary =
1016 socket->receive_buffer_boundaries[packet + sequence_increase];
1017 if (0 == ahead_buffer_boundary)
1018 socket->receive_buffer_boundaries[packet] = 0;
1021 GNUNET_assert (offset_increase < ahead_buffer_boundary);
1022 socket->receive_buffer_boundaries[packet] =
1023 ahead_buffer_boundary - offset_increase;
1027 socket->receive_buffer_boundaries[packet] = 0;
1033 * Cancels the existing read io handle
1035 * @param cls the closure from the SCHEDULER call
1036 * @param tc the task context
1039 read_io_timeout (void *cls,
1040 const struct GNUNET_SCHEDULER_TaskContext *tc)
1042 struct GNUNET_STREAM_Socket *socket = cls;
1043 GNUNET_STREAM_DataProcessor proc;
1046 socket->read_io_timeout_task_id = GNUNET_SCHEDULER_NO_TASK;
1047 if (socket->read_task_id != GNUNET_SCHEDULER_NO_TASK)
1049 LOG (GNUNET_ERROR_TYPE_DEBUG,
1050 "%s: Read task timedout - Cancelling it\n",
1051 GNUNET_i2s (&socket->other_peer));
1052 GNUNET_SCHEDULER_cancel (socket->read_task_id);
1053 socket->read_task_id = GNUNET_SCHEDULER_NO_TASK;
1055 GNUNET_assert (NULL != socket->read_handle);
1056 proc = socket->read_handle->proc;
1057 proc_cls = socket->read_handle->proc_cls;
1058 GNUNET_free (socket->read_handle);
1059 socket->read_handle = NULL;
1060 /* Call the read processor to signal timeout */
1062 GNUNET_STREAM_TIMEOUT,
1069 * Handler for DATA messages; Same for both client and server
1071 * @param socket the socket through which the ack was received
1072 * @param tunnel connection to the other end
1073 * @param sender who sent the message
1074 * @param msg the data message
1075 * @param atsi performance data for the connection
1076 * @return GNUNET_OK to keep the connection open,
1077 * GNUNET_SYSERR to close it (signal serious error)
1080 handle_data (struct GNUNET_STREAM_Socket *socket,
1081 struct GNUNET_MESH_Tunnel *tunnel,
1082 const struct GNUNET_PeerIdentity *sender,
1083 const struct GNUNET_STREAM_DataMessage *msg,
1084 const struct GNUNET_ATS_Information*atsi)
1086 const void *payload;
1087 struct GNUNET_TIME_Relative ack_deadline_rel;
1088 uint32_t bytes_needed;
1089 uint32_t relative_offset;
1090 uint32_t relative_sequence_number;
1093 size = htons (msg->header.header.size);
1094 if (size < sizeof (struct GNUNET_STREAM_DataMessage))
1096 GNUNET_break_op (0);
1097 return GNUNET_SYSERR;
1099 if (0 != memcmp (sender, &socket->other_peer,
1100 sizeof (struct GNUNET_PeerIdentity)))
1102 LOG (GNUNET_ERROR_TYPE_DEBUG,
1103 "%s: Received DATA from non-confirming peer\n",
1104 GNUNET_i2s (&socket->other_peer));
1107 switch (socket->state)
1109 case STATE_ESTABLISHED:
1110 case STATE_TRANSMIT_CLOSED:
1111 case STATE_TRANSMIT_CLOSE_WAIT:
1112 /* check if the message's sequence number is in the range we are
1114 relative_sequence_number =
1115 ntohl (msg->sequence_number) - socket->read_sequence_number;
1116 if ( relative_sequence_number > GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH)
1118 LOG (GNUNET_ERROR_TYPE_DEBUG,
1119 "%s: Ignoring received message with sequence number %u\n",
1120 GNUNET_i2s (&socket->other_peer),
1121 ntohl (msg->sequence_number));
1122 /* Start ACK sending task if one is not already present */
1123 if (GNUNET_SCHEDULER_NO_TASK == socket->ack_task_id)
1125 socket->ack_task_id =
1126 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_ntoh
1127 (msg->ack_deadline),
1133 /* Check if we have already seen this message */
1134 if (GNUNET_YES == ackbitmap_is_bit_set (&socket->ack_bitmap,
1135 relative_sequence_number))
1137 LOG (GNUNET_ERROR_TYPE_DEBUG,
1138 "%s: Ignoring already received message with sequence number %u\n",
1139 GNUNET_i2s (&socket->other_peer),
1140 ntohl (msg->sequence_number));
1141 /* Start ACK sending task if one is not already present */
1142 if (GNUNET_SCHEDULER_NO_TASK == socket->ack_task_id)
1144 socket->ack_task_id =
1145 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_ntoh
1146 (msg->ack_deadline), &ack_task, socket);
1150 LOG (GNUNET_ERROR_TYPE_DEBUG,
1151 "%s: Receiving DATA with sequence number: %u and size: %d from %s\n",
1152 GNUNET_i2s (&socket->other_peer), ntohl (msg->sequence_number),
1153 ntohs (msg->header.header.size), GNUNET_i2s (&socket->other_peer));
1154 /* Check if we have to allocate the buffer */
1155 size -= sizeof (struct GNUNET_STREAM_DataMessage);
1156 relative_offset = ntohl (msg->offset) - socket->read_offset;
1157 bytes_needed = relative_offset + size;
1158 if (bytes_needed > socket->receive_buffer_size)
1160 if (bytes_needed <= RECEIVE_BUFFER_SIZE)
1162 socket->receive_buffer = GNUNET_realloc (socket->receive_buffer,
1164 socket->receive_buffer_size = bytes_needed;
1168 LOG (GNUNET_ERROR_TYPE_DEBUG,
1169 "%s: Cannot accommodate packet %d as buffer is full\n",
1170 GNUNET_i2s (&socket->other_peer), ntohl (msg->sequence_number));
1174 /* Copy Data to buffer */
1176 GNUNET_assert (relative_offset + size <= socket->receive_buffer_size);
1177 memcpy (socket->receive_buffer + relative_offset, payload, size);
1178 socket->receive_buffer_boundaries[relative_sequence_number] =
1179 relative_offset + size;
1180 /* Modify the ACK bitmap */
1181 ackbitmap_modify_bit (&socket->ack_bitmap, relative_sequence_number,
1183 /* Start ACK sending task if one is not already present */
1184 ack_deadline_rel = GNUNET_TIME_relative_ntoh (msg->ack_deadline);
1185 if (GNUNET_SCHEDULER_NO_TASK == socket->ack_task_id)
1188 GNUNET_TIME_relative_min (ack_deadline_rel,
1189 GNUNET_TIME_relative_multiply
1190 (GNUNET_TIME_UNIT_SECONDS, 300));
1191 socket->ack_task_id =
1192 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_ntoh
1193 (msg->ack_deadline), &ack_task, socket);
1194 socket->ack_time_registered = GNUNET_TIME_absolute_get ();
1195 socket->ack_time_deadline = ack_deadline_rel;
1199 struct GNUNET_TIME_Relative ack_time_past;
1200 struct GNUNET_TIME_Relative ack_time_remaining;
1201 struct GNUNET_TIME_Relative ack_time_min;
1203 GNUNET_TIME_absolute_get_duration (socket->ack_time_registered);
1204 ack_time_remaining = GNUNET_TIME_relative_subtract
1205 (socket->ack_time_deadline, ack_time_past);
1206 ack_time_min = GNUNET_TIME_relative_min (ack_time_remaining,
1208 if (0 == memcmp(&ack_deadline_rel, &ack_time_min,
1209 sizeof (struct GNUNET_TIME_Relative)))
1211 ack_deadline_rel = ack_time_min;
1212 GNUNET_SCHEDULER_cancel (socket->ack_task_id);
1213 socket->ack_task_id = GNUNET_SCHEDULER_add_delayed (ack_deadline_rel,
1215 socket->ack_time_registered = GNUNET_TIME_absolute_get ();
1216 socket->ack_time_deadline = ack_deadline_rel;
1219 if ((NULL != socket->read_handle) /* A read handle is waiting */
1220 /* There is no current read task */
1221 && (GNUNET_SCHEDULER_NO_TASK == socket->read_task_id)
1222 /* We have the first packet */
1223 && (GNUNET_YES == ackbitmap_is_bit_set(&socket->ack_bitmap, 0)))
1225 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s: Scheduling read processor\n",
1226 GNUNET_i2s (&socket->other_peer));
1227 socket->read_task_id = GNUNET_SCHEDULER_add_now (&call_read_processor,
1232 LOG (GNUNET_ERROR_TYPE_DEBUG,
1233 "%s: Received data message when it cannot be handled\n",
1234 GNUNET_i2s (&socket->other_peer));
1242 * Client's message Handler for GNUNET_MESSAGE_TYPE_STREAM_DATA
1244 * @param cls the socket (set from GNUNET_MESH_connect)
1245 * @param tunnel connection to the other end
1246 * @param tunnel_ctx place to store local state associated with the tunnel
1247 * @param sender who sent the message
1248 * @param message the actual message
1249 * @param atsi performance data for the connection
1250 * @return GNUNET_OK to keep the connection open,
1251 * GNUNET_SYSERR to close it (signal serious error)
1254 client_handle_data (void *cls,
1255 struct GNUNET_MESH_Tunnel *tunnel,
1257 const struct GNUNET_PeerIdentity *sender,
1258 const struct GNUNET_MessageHeader *message,
1259 const struct GNUNET_ATS_Information*atsi)
1261 struct GNUNET_STREAM_Socket *socket = cls;
1263 return handle_data (socket, tunnel, sender,
1264 (const struct GNUNET_STREAM_DataMessage *) message, atsi);
1269 * Callback to set state to ESTABLISHED
1271 * @param cls the closure NULL;
1272 * @param socket the socket to requiring state change
1275 set_state_established (void *cls,
1276 struct GNUNET_STREAM_Socket *socket)
1278 LOG (GNUNET_ERROR_TYPE_DEBUG,
1279 "%s: Attaining ESTABLISHED state\n",
1280 GNUNET_i2s (&socket->other_peer));
1281 socket->write_offset = 0;
1282 socket->read_offset = 0;
1283 socket->state = STATE_ESTABLISHED;
1284 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK !=
1285 socket->control_retransmission_task_id);
1286 GNUNET_SCHEDULER_cancel (socket->control_retransmission_task_id);
1287 socket->control_retransmission_task_id = GNUNET_SCHEDULER_NO_TASK;
1288 if (NULL != socket->lsocket)
1290 LOG (GNUNET_ERROR_TYPE_DEBUG,
1291 "%s: Calling listen callback\n",
1292 GNUNET_i2s (&socket->other_peer));
1293 if (GNUNET_SYSERR ==
1294 socket->lsocket->listen_cb (socket->lsocket->listen_cb_cls,
1296 &socket->other_peer))
1298 socket->state = STATE_CLOSED;
1299 /* FIXME: We should close in a decent way (send RST) */
1300 GNUNET_MESH_tunnel_destroy (socket->tunnel); /* Destroy the tunnel */
1301 GNUNET_free (socket);
1305 socket->open_cb (socket->open_cls, socket);
1310 * Callback to set state to HELLO_WAIT
1312 * @param cls the closure from queue_message
1313 * @param socket the socket to requiring state change
1316 set_state_hello_wait (void *cls,
1317 struct GNUNET_STREAM_Socket *socket)
1319 GNUNET_assert (STATE_INIT == socket->state);
1320 LOG (GNUNET_ERROR_TYPE_DEBUG,
1321 "%s: Attaining HELLO_WAIT state\n",
1322 GNUNET_i2s (&socket->other_peer));
1323 socket->state = STATE_HELLO_WAIT;
1328 * Callback to set state to CLOSE_WAIT
1330 * @param cls the closure from queue_message
1331 * @param socket the socket requiring state change
1334 set_state_close_wait (void *cls,
1335 struct GNUNET_STREAM_Socket *socket)
1337 LOG (GNUNET_ERROR_TYPE_DEBUG,
1338 "%s: Attaing CLOSE_WAIT state\n",
1339 GNUNET_i2s (&socket->other_peer));
1340 socket->state = STATE_CLOSE_WAIT;
1341 GNUNET_free_non_null (socket->receive_buffer); /* Free the receive buffer */
1342 socket->receive_buffer = NULL;
1343 socket->receive_buffer_size = 0;
1348 * Callback to set state to RECEIVE_CLOSE_WAIT
1350 * @param cls the closure from queue_message
1351 * @param socket the socket requiring state change
1354 set_state_receive_close_wait (void *cls,
1355 struct GNUNET_STREAM_Socket *socket)
1357 LOG (GNUNET_ERROR_TYPE_DEBUG,
1358 "%s: Attaing RECEIVE_CLOSE_WAIT state\n",
1359 GNUNET_i2s (&socket->other_peer));
1360 socket->state = STATE_RECEIVE_CLOSE_WAIT;
1361 GNUNET_free_non_null (socket->receive_buffer); /* Free the receive buffer */
1362 socket->receive_buffer = NULL;
1363 socket->receive_buffer_size = 0;
1368 * Callback to set state to TRANSMIT_CLOSE_WAIT
1370 * @param cls the closure from queue_message
1371 * @param socket the socket requiring state change
1374 set_state_transmit_close_wait (void *cls,
1375 struct GNUNET_STREAM_Socket *socket)
1377 LOG (GNUNET_ERROR_TYPE_DEBUG,
1378 "%s: Attaing TRANSMIT_CLOSE_WAIT state\n",
1379 GNUNET_i2s (&socket->other_peer));
1380 socket->state = STATE_TRANSMIT_CLOSE_WAIT;
1385 * Callback to set state to CLOSED
1387 * @param cls the closure from queue_message
1388 * @param socket the socket requiring state change
1391 set_state_closed (void *cls,
1392 struct GNUNET_STREAM_Socket *socket)
1394 socket->state = STATE_CLOSED;
1399 * Returns GNUNET_MESSAGE_TYPE_STREAM_HELLO
1401 * @return the generate hello message
1403 static struct GNUNET_STREAM_MessageHeader *
1404 generate_hello (void)
1406 struct GNUNET_STREAM_MessageHeader *msg;
1408 msg = GNUNET_malloc (sizeof (struct GNUNET_STREAM_MessageHeader));
1409 msg->header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_HELLO);
1410 msg->header.size = htons (sizeof (struct GNUNET_STREAM_MessageHeader));
1416 * Returns a new HelloAckMessage. Also sets the write sequence number for the
1419 * @param socket the socket for which this HelloAckMessage has to be generated
1420 * @param generate_seq GNUNET_YES to generate the write sequence number,
1421 * GNUNET_NO to use the existing sequence number
1422 * @return the HelloAckMessage
1424 static struct GNUNET_STREAM_HelloAckMessage *
1425 generate_hello_ack (struct GNUNET_STREAM_Socket *socket,
1428 struct GNUNET_STREAM_HelloAckMessage *msg;
1430 if (GNUNET_YES == generate_seq)
1432 if (GNUNET_YES == socket->testing_active)
1433 socket->write_sequence_number =
1434 socket->testing_set_write_sequence_number_value;
1436 socket->write_sequence_number =
1437 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1438 LOG_DEBUG ("%s: write sequence number %u\n",
1439 GNUNET_i2s (&socket->other_peer),
1440 (unsigned int) socket->write_sequence_number);
1442 msg = GNUNET_malloc (sizeof (struct GNUNET_STREAM_HelloAckMessage));
1443 msg->header.header.size =
1444 htons (sizeof (struct GNUNET_STREAM_HelloAckMessage));
1445 msg->header.header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_HELLO_ACK);
1446 msg->sequence_number = htonl (socket->write_sequence_number);
1447 msg->receiver_window_size = htonl (RECEIVE_BUFFER_SIZE);
1453 * Task for retransmitting control messages if they aren't ACK'ed before a
1456 * @param cls the socket
1457 * @param tc the Task context
1460 control_retransmission_task (void *cls,
1461 const struct GNUNET_SCHEDULER_TaskContext *tc)
1463 struct GNUNET_STREAM_Socket *socket = cls;
1465 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
1467 socket->control_retransmission_task_id = GNUNET_SCHEDULER_NO_TASK;
1468 LOG_DEBUG ("%s: Retransmitting a control message\n",
1469 GNUNET_i2s (&socket->other_peer));
1470 switch (socket->state)
1478 case STATE_HELLO_WAIT:
1479 if (NULL == socket->lsocket) /* We are client */
1480 queue_message (socket, generate_hello (), NULL, NULL, GNUNET_NO);
1482 queue_message (socket,
1483 (struct GNUNET_STREAM_MessageHeader *)
1484 generate_hello_ack (socket, GNUNET_NO), NULL, NULL,
1486 socket->control_retransmission_task_id =
1487 GNUNET_SCHEDULER_add_delayed (socket->retransmit_timeout,
1488 &control_retransmission_task, socket);
1490 case STATE_ESTABLISHED:
1491 if (NULL == socket->lsocket)
1492 queue_message (socket,
1493 (struct GNUNET_STREAM_MessageHeader *)
1494 generate_hello_ack (socket, GNUNET_NO), NULL, NULL,
1505 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_HELLO_ACK
1507 * @param cls the socket (set from GNUNET_MESH_connect)
1508 * @param tunnel connection to the other end
1509 * @param tunnel_ctx this is NULL
1510 * @param sender who sent the message
1511 * @param message the actual message
1512 * @param atsi performance data for the connection
1513 * @return GNUNET_OK to keep the connection open,
1514 * GNUNET_SYSERR to close it (signal serious error)
1517 client_handle_hello_ack (void *cls,
1518 struct GNUNET_MESH_Tunnel *tunnel,
1520 const struct GNUNET_PeerIdentity *sender,
1521 const struct GNUNET_MessageHeader *message,
1522 const struct GNUNET_ATS_Information*atsi)
1524 struct GNUNET_STREAM_Socket *socket = cls;
1525 const struct GNUNET_STREAM_HelloAckMessage *ack_msg;
1526 struct GNUNET_STREAM_HelloAckMessage *reply;
1528 if (0 != memcmp (sender, &socket->other_peer,
1529 sizeof (struct GNUNET_PeerIdentity)))
1531 LOG (GNUNET_ERROR_TYPE_DEBUG,
1532 "%s: Received HELLO_ACK from non-confirming peer\n",
1533 GNUNET_i2s (&socket->other_peer));
1536 ack_msg = (const struct GNUNET_STREAM_HelloAckMessage *) message;
1537 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s: Received HELLO_ACK from %s\n",
1538 GNUNET_i2s (&socket->other_peer), GNUNET_i2s (&socket->other_peer));
1539 GNUNET_assert (socket->tunnel == tunnel);
1540 switch (socket->state)
1542 case STATE_HELLO_WAIT:
1543 socket->read_sequence_number = ntohl (ack_msg->sequence_number);
1544 LOG (GNUNET_ERROR_TYPE_DEBUG,
1545 "%s: Read sequence number %u\n",
1546 GNUNET_i2s (&socket->other_peer),
1547 (unsigned int) socket->read_sequence_number);
1548 socket->receiver_window_available = ntohl (ack_msg->receiver_window_size);
1549 reply = generate_hello_ack (socket, GNUNET_YES);
1550 queue_message (socket, &reply->header, &set_state_established,
1553 case STATE_ESTABLISHED:
1554 // call statistics (# ACKs ignored++)
1555 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK ==
1556 socket->control_retransmission_task_id);
1557 socket->control_retransmission_task_id =
1558 GNUNET_SCHEDULER_add_now (&control_retransmission_task, socket);
1561 LOG_DEBUG ("%s: Server %s sent HELLO_ACK when in state %d\n",
1562 GNUNET_i2s (&socket->other_peer),
1563 GNUNET_i2s (&socket->other_peer), socket->state);
1564 socket->state = STATE_CLOSED; // introduce STATE_ERROR?
1565 return GNUNET_SYSERR;
1571 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_RESET
1573 * @param cls the socket (set from GNUNET_MESH_connect)
1574 * @param tunnel connection to the other end
1575 * @param tunnel_ctx this is NULL
1576 * @param sender who sent the message
1577 * @param message the actual message
1578 * @param atsi performance data for the connection
1579 * @return GNUNET_OK to keep the connection open,
1580 * GNUNET_SYSERR to close it (signal serious error)
1583 client_handle_reset (void *cls,
1584 struct GNUNET_MESH_Tunnel *tunnel,
1586 const struct GNUNET_PeerIdentity *sender,
1587 const struct GNUNET_MessageHeader *message,
1588 const struct GNUNET_ATS_Information*atsi)
1590 // struct GNUNET_STREAM_Socket *socket = cls;
1597 * Common message handler for handling TRANSMIT_CLOSE messages
1599 * @param socket the socket through which the ack was received
1600 * @param tunnel connection to the other end
1601 * @param sender who sent the message
1602 * @param msg the transmit close message
1603 * @param atsi performance data for the connection
1604 * @return GNUNET_OK to keep the connection open,
1605 * GNUNET_SYSERR to close it (signal serious error)
1608 handle_transmit_close (struct GNUNET_STREAM_Socket *socket,
1609 struct GNUNET_MESH_Tunnel *tunnel,
1610 const struct GNUNET_PeerIdentity *sender,
1611 const struct GNUNET_STREAM_MessageHeader *msg,
1612 const struct GNUNET_ATS_Information*atsi)
1614 struct GNUNET_STREAM_MessageHeader *reply;
1616 switch (socket->state)
1618 case STATE_ESTABLISHED:
1619 socket->state = STATE_RECEIVE_CLOSED;
1620 /* Send TRANSMIT_CLOSE_ACK */
1621 reply = GNUNET_malloc (sizeof (struct GNUNET_STREAM_MessageHeader));
1622 reply->header.type =
1623 htons (GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE_ACK);
1624 reply->header.size = htons (sizeof (struct GNUNET_STREAM_MessageHeader));
1625 queue_message (socket, reply, NULL, NULL, GNUNET_NO);
1628 /* FIXME: Call statistics? */
1636 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE
1638 * @param cls the socket (set from GNUNET_MESH_connect)
1639 * @param tunnel connection to the other end
1640 * @param tunnel_ctx this is NULL
1641 * @param sender who sent the message
1642 * @param message the actual message
1643 * @param atsi performance data for the connection
1644 * @return GNUNET_OK to keep the connection open,
1645 * GNUNET_SYSERR to close it (signal serious error)
1648 client_handle_transmit_close (void *cls,
1649 struct GNUNET_MESH_Tunnel *tunnel,
1651 const struct GNUNET_PeerIdentity *sender,
1652 const struct GNUNET_MessageHeader *message,
1653 const struct GNUNET_ATS_Information*atsi)
1655 struct GNUNET_STREAM_Socket *socket = cls;
1657 return handle_transmit_close (socket,
1660 (struct GNUNET_STREAM_MessageHeader *)message,
1666 * Generic handler for GNUNET_MESSAGE_TYPE_STREAM_*_CLOSE_ACK messages
1668 * @param socket the socket
1669 * @param tunnel connection to the other end
1670 * @param sender who sent the message
1671 * @param message the actual message
1672 * @param atsi performance data for the connection
1673 * @param operation the close operation which is being ACK'ed
1674 * @return GNUNET_OK to keep the connection open,
1675 * GNUNET_SYSERR to close it (signal serious error)
1678 handle_generic_close_ack (struct GNUNET_STREAM_Socket *socket,
1679 struct GNUNET_MESH_Tunnel *tunnel,
1680 const struct GNUNET_PeerIdentity *sender,
1681 const struct GNUNET_STREAM_MessageHeader *message,
1682 const struct GNUNET_ATS_Information *atsi,
1685 struct GNUNET_STREAM_ShutdownHandle *shutdown_handle;
1687 shutdown_handle = socket->shutdown_handle;
1688 if (NULL == shutdown_handle)
1690 LOG (GNUNET_ERROR_TYPE_DEBUG,
1691 "%s: Received CLOSE_ACK when shutdown handle is NULL\n",
1692 GNUNET_i2s (&socket->other_peer));
1698 switch (socket->state)
1700 case STATE_CLOSE_WAIT:
1701 if (SHUT_RDWR != shutdown_handle->operation)
1703 LOG (GNUNET_ERROR_TYPE_DEBUG,
1704 "%s: Received CLOSE_ACK when shutdown handle is not for "
1705 "SHUT_RDWR\n", GNUNET_i2s (&socket->other_peer));
1708 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s: Received CLOSE_ACK from %s\n",
1709 GNUNET_i2s (&socket->other_peer), GNUNET_i2s (&socket->other_peer));
1710 socket->state = STATE_CLOSED;
1713 LOG (GNUNET_ERROR_TYPE_DEBUG,
1714 "%s: Received CLOSE_ACK when in it not expected\n",
1715 GNUNET_i2s (&socket->other_peer));
1720 switch (socket->state)
1722 case STATE_RECEIVE_CLOSE_WAIT:
1723 if (SHUT_RD != shutdown_handle->operation)
1725 LOG (GNUNET_ERROR_TYPE_DEBUG,
1726 "%s: Received RECEIVE_CLOSE_ACK when shutdown handle "
1727 "is not for SHUT_RD\n", GNUNET_i2s (&socket->other_peer));
1730 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s: Received RECEIVE_CLOSE_ACK from %s\n",
1731 GNUNET_i2s (&socket->other_peer), GNUNET_i2s (&socket->other_peer));
1732 socket->state = STATE_RECEIVE_CLOSED;
1735 LOG (GNUNET_ERROR_TYPE_DEBUG,
1736 "%s: Received RECEIVE_CLOSE_ACK when in it not expected\n",
1737 GNUNET_i2s (&socket->other_peer));
1742 switch (socket->state)
1744 case STATE_TRANSMIT_CLOSE_WAIT:
1745 if (SHUT_WR != shutdown_handle->operation)
1747 LOG (GNUNET_ERROR_TYPE_DEBUG,
1748 "%s: Received TRANSMIT_CLOSE_ACK when shutdown handle "
1749 "is not for SHUT_WR\n",
1750 GNUNET_i2s (&socket->other_peer));
1753 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s: Received TRANSMIT_CLOSE_ACK from %s\n",
1754 GNUNET_i2s (&socket->other_peer), GNUNET_i2s (&socket->other_peer));
1755 socket->state = STATE_TRANSMIT_CLOSED;
1758 LOG (GNUNET_ERROR_TYPE_DEBUG,
1759 "%s: Received TRANSMIT_CLOSE_ACK when in it not expected\n",
1760 GNUNET_i2s (&socket->other_peer));
1767 if (NULL != shutdown_handle->completion_cb) /* Shutdown completion */
1768 shutdown_handle->completion_cb(shutdown_handle->completion_cls,
1770 if (GNUNET_SCHEDULER_NO_TASK
1771 != shutdown_handle->close_msg_retransmission_task_id)
1773 GNUNET_SCHEDULER_cancel
1774 (shutdown_handle->close_msg_retransmission_task_id);
1775 shutdown_handle->close_msg_retransmission_task_id =
1776 GNUNET_SCHEDULER_NO_TASK;
1778 GNUNET_free (shutdown_handle); /* Free shutdown handle */
1779 socket->shutdown_handle = NULL;
1785 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE_ACK
1787 * @param cls the socket (set from GNUNET_MESH_connect)
1788 * @param tunnel connection to the other end
1789 * @param tunnel_ctx this is NULL
1790 * @param sender who sent the message
1791 * @param message the actual message
1792 * @param atsi performance data for the connection
1793 * @return GNUNET_OK to keep the connection open,
1794 * GNUNET_SYSERR to close it (signal serious error)
1797 client_handle_transmit_close_ack (void *cls,
1798 struct GNUNET_MESH_Tunnel *tunnel,
1800 const struct GNUNET_PeerIdentity *sender,
1801 const struct GNUNET_MessageHeader *message,
1802 const struct GNUNET_ATS_Information*atsi)
1804 struct GNUNET_STREAM_Socket *socket = cls;
1806 return handle_generic_close_ack (socket,
1809 (const struct GNUNET_STREAM_MessageHeader *)
1817 * Generic handler for GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE
1819 * @param socket the socket
1820 * @param tunnel connection to the other end
1821 * @param sender who sent the message
1822 * @param message the actual message
1823 * @param atsi performance data for the connection
1824 * @return GNUNET_OK to keep the connection open,
1825 * GNUNET_SYSERR to close it (signal serious error)
1828 handle_receive_close (struct GNUNET_STREAM_Socket *socket,
1829 struct GNUNET_MESH_Tunnel *tunnel,
1830 const struct GNUNET_PeerIdentity *sender,
1831 const struct GNUNET_STREAM_MessageHeader *message,
1832 const struct GNUNET_ATS_Information *atsi)
1834 struct GNUNET_STREAM_MessageHeader *receive_close_ack;
1836 switch (socket->state)
1840 case STATE_HELLO_WAIT:
1841 LOG (GNUNET_ERROR_TYPE_DEBUG,
1842 "%s: Ignoring RECEIVE_CLOSE as it cannot be handled now\n",
1843 GNUNET_i2s (&socket->other_peer));
1849 LOG (GNUNET_ERROR_TYPE_DEBUG,
1850 "%s: Received RECEIVE_CLOSE from %s\n",
1851 GNUNET_i2s (&socket->other_peer),
1852 GNUNET_i2s (&socket->other_peer));
1854 GNUNET_malloc (sizeof (struct GNUNET_STREAM_MessageHeader));
1855 receive_close_ack->header.size =
1856 htons (sizeof (struct GNUNET_STREAM_MessageHeader));
1857 receive_close_ack->header.type =
1858 htons (GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE_ACK);
1859 queue_message (socket, receive_close_ack, &set_state_closed,
1861 /* FIXME: Handle the case where write handle is present; the write operation
1862 should be deemed as finised and the write continuation callback
1863 has to be called with the stream status GNUNET_STREAM_SHUTDOWN */
1869 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE
1871 * @param cls the socket (set from GNUNET_MESH_connect)
1872 * @param tunnel connection to the other end
1873 * @param tunnel_ctx this is NULL
1874 * @param sender who sent the message
1875 * @param message the actual message
1876 * @param atsi performance data for the connection
1877 * @return GNUNET_OK to keep the connection open,
1878 * GNUNET_SYSERR to close it (signal serious error)
1881 client_handle_receive_close (void *cls,
1882 struct GNUNET_MESH_Tunnel *tunnel,
1884 const struct GNUNET_PeerIdentity *sender,
1885 const struct GNUNET_MessageHeader *message,
1886 const struct GNUNET_ATS_Information*atsi)
1888 struct GNUNET_STREAM_Socket *socket = cls;
1891 handle_receive_close (socket,
1894 (const struct GNUNET_STREAM_MessageHeader *) message,
1900 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE_ACK
1902 * @param cls the socket (set from GNUNET_MESH_connect)
1903 * @param tunnel connection to the other end
1904 * @param tunnel_ctx this is NULL
1905 * @param sender who sent the message
1906 * @param message the actual message
1907 * @param atsi performance data for the connection
1908 * @return GNUNET_OK to keep the connection open,
1909 * GNUNET_SYSERR to close it (signal serious error)
1912 client_handle_receive_close_ack (void *cls,
1913 struct GNUNET_MESH_Tunnel *tunnel,
1915 const struct GNUNET_PeerIdentity *sender,
1916 const struct GNUNET_MessageHeader *message,
1917 const struct GNUNET_ATS_Information*atsi)
1919 struct GNUNET_STREAM_Socket *socket = cls;
1921 return handle_generic_close_ack (socket,
1924 (const struct GNUNET_STREAM_MessageHeader *)
1932 * Generic handler for GNUNET_MESSAGE_TYPE_STREAM_CLOSE
1934 * @param socket the socket
1935 * @param tunnel connection to the other end
1936 * @param sender who sent the message
1937 * @param message the actual message
1938 * @param atsi performance data for the connection
1939 * @return GNUNET_OK to keep the connection open,
1940 * GNUNET_SYSERR to close it (signal serious error)
1943 handle_close (struct GNUNET_STREAM_Socket *socket,
1944 struct GNUNET_MESH_Tunnel *tunnel,
1945 const struct GNUNET_PeerIdentity *sender,
1946 const struct GNUNET_STREAM_MessageHeader *message,
1947 const struct GNUNET_ATS_Information*atsi)
1949 struct GNUNET_STREAM_MessageHeader *close_ack;
1951 switch (socket->state)
1955 case STATE_HELLO_WAIT:
1956 LOG (GNUNET_ERROR_TYPE_DEBUG,
1957 "%s: Ignoring RECEIVE_CLOSE as it cannot be handled now\n",
1958 GNUNET_i2s (&socket->other_peer));
1964 LOG (GNUNET_ERROR_TYPE_DEBUG,
1965 "%s: Received CLOSE from %s\n",
1966 GNUNET_i2s (&socket->other_peer),
1967 GNUNET_i2s (&socket->other_peer));
1968 close_ack = GNUNET_malloc (sizeof (struct GNUNET_STREAM_MessageHeader));
1969 close_ack->header.size = htons (sizeof (struct GNUNET_STREAM_MessageHeader));
1970 close_ack->header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_CLOSE_ACK);
1971 queue_message (socket, close_ack, &set_state_closed, NULL, GNUNET_NO);
1972 if (socket->state == STATE_CLOSED)
1975 GNUNET_free_non_null (socket->receive_buffer); /* Free the receive buffer */
1976 socket->receive_buffer = NULL;
1977 socket->receive_buffer_size = 0;
1983 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_CLOSE
1985 * @param cls the socket (set from GNUNET_MESH_connect)
1986 * @param tunnel connection to the other end
1987 * @param tunnel_ctx this is NULL
1988 * @param sender who sent the message
1989 * @param message the actual message
1990 * @param atsi performance data for the connection
1991 * @return GNUNET_OK to keep the connection open,
1992 * GNUNET_SYSERR to close it (signal serious error)
1995 client_handle_close (void *cls,
1996 struct GNUNET_MESH_Tunnel *tunnel,
1998 const struct GNUNET_PeerIdentity *sender,
1999 const struct GNUNET_MessageHeader *message,
2000 const struct GNUNET_ATS_Information*atsi)
2002 struct GNUNET_STREAM_Socket *socket = cls;
2004 return handle_close (socket,
2007 (const struct GNUNET_STREAM_MessageHeader *) message,
2013 * Client's message handler for GNUNET_MESSAGE_TYPE_STREAM_CLOSE_ACK
2015 * @param cls the socket (set from GNUNET_MESH_connect)
2016 * @param tunnel connection to the other end
2017 * @param tunnel_ctx this is NULL
2018 * @param sender who sent the message
2019 * @param message the actual message
2020 * @param atsi performance data for the connection
2021 * @return GNUNET_OK to keep the connection open,
2022 * GNUNET_SYSERR to close it (signal serious error)
2025 client_handle_close_ack (void *cls,
2026 struct GNUNET_MESH_Tunnel *tunnel,
2028 const struct GNUNET_PeerIdentity *sender,
2029 const struct GNUNET_MessageHeader *message,
2030 const struct GNUNET_ATS_Information *atsi)
2032 struct GNUNET_STREAM_Socket *socket = cls;
2034 return handle_generic_close_ack (socket,
2037 (const struct GNUNET_STREAM_MessageHeader *)
2043 /*****************************/
2044 /* Server's Message Handlers */
2045 /*****************************/
2048 * Server's message Handler for GNUNET_MESSAGE_TYPE_STREAM_DATA
2050 * @param cls the closure
2051 * @param tunnel connection to the other end
2052 * @param tunnel_ctx the socket
2053 * @param sender who sent the message
2054 * @param message the actual message
2055 * @param atsi performance data for the connection
2056 * @return GNUNET_OK to keep the connection open,
2057 * GNUNET_SYSERR to close it (signal serious error)
2060 server_handle_data (void *cls,
2061 struct GNUNET_MESH_Tunnel *tunnel,
2063 const struct GNUNET_PeerIdentity *sender,
2064 const struct GNUNET_MessageHeader *message,
2065 const struct GNUNET_ATS_Information*atsi)
2067 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2069 return handle_data (socket,
2072 (const struct GNUNET_STREAM_DataMessage *)message,
2078 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_HELLO
2080 * @param cls the closure
2081 * @param tunnel connection to the other end
2082 * @param tunnel_ctx the socket
2083 * @param sender who sent the message
2084 * @param message the actual message
2085 * @param atsi performance data for the connection
2086 * @return GNUNET_OK to keep the connection open,
2087 * GNUNET_SYSERR to close it (signal serious error)
2090 server_handle_hello (void *cls,
2091 struct GNUNET_MESH_Tunnel *tunnel,
2093 const struct GNUNET_PeerIdentity *sender,
2094 const struct GNUNET_MessageHeader *message,
2095 const struct GNUNET_ATS_Information*atsi)
2097 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2098 struct GNUNET_STREAM_HelloAckMessage *reply;
2100 if (0 != memcmp (sender,
2101 &socket->other_peer,
2102 sizeof (struct GNUNET_PeerIdentity)))
2104 LOG_DEBUG ("%s: Received HELLO from non-confirming peer\n",
2105 GNUNET_i2s (&socket->other_peer));
2108 GNUNET_assert (GNUNET_MESSAGE_TYPE_STREAM_HELLO == ntohs (message->type));
2109 GNUNET_assert (socket->tunnel == tunnel);
2110 LOG_DEBUG ("%s: Received HELLO from %s\n", GNUNET_i2s (&socket->other_peer),
2111 GNUNET_i2s (&socket->other_peer));
2112 switch (socket->status)
2115 reply = generate_hello_ack (socket, GNUNET_YES);
2116 queue_message (socket, &reply->header, &set_state_hello_wait, NULL,
2118 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK ==
2119 socket->control_retransmission_task_id);
2120 socket->control_retransmission_task_id =
2121 GNUNET_SCHEDULER_add_delayed (socket->retransmit_timeout,
2122 &control_retransmission_task, socket);
2124 case STATE_HELLO_WAIT:
2125 /* Perhaps our HELLO_ACK was lost */
2126 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK !=
2127 socket->control_retransmission_task_id);
2128 GNUNET_SCHEDULER_cancel (socket->control_retransmission_task_id);
2129 socket->control_retransmission_task_id =
2130 GNUNET_SCHEDULER_add_now (&control_retransmission_task, socket);
2133 LOG_DEBUG( "%s: Client sent HELLO when in state %d\n",
2134 GNUNET_i2s (&socket->other_peer), socket->state);
2135 /* FIXME: Send RESET? */
2142 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_HELLO_ACK
2144 * @param cls the closure
2145 * @param tunnel connection to the other end
2146 * @param tunnel_ctx the socket
2147 * @param sender who sent the message
2148 * @param message the actual message
2149 * @param atsi performance data for the connection
2150 * @return GNUNET_OK to keep the connection open,
2151 * GNUNET_SYSERR to close it (signal serious error)
2154 server_handle_hello_ack (void *cls,
2155 struct GNUNET_MESH_Tunnel *tunnel,
2157 const struct GNUNET_PeerIdentity *sender,
2158 const struct GNUNET_MessageHeader *message,
2159 const struct GNUNET_ATS_Information*atsi)
2161 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2162 const struct GNUNET_STREAM_HelloAckMessage *ack_message;
2164 GNUNET_assert (GNUNET_MESSAGE_TYPE_STREAM_HELLO_ACK ==
2165 ntohs (message->type));
2166 GNUNET_assert (socket->tunnel == tunnel);
2167 ack_message = (struct GNUNET_STREAM_HelloAckMessage *) message;
2168 switch (socket->state)
2170 case STATE_HELLO_WAIT:
2171 LOG (GNUNET_ERROR_TYPE_DEBUG,
2172 "%s: Received HELLO_ACK from %s\n",
2173 GNUNET_i2s (&socket->other_peer),
2174 GNUNET_i2s (&socket->other_peer));
2175 socket->read_sequence_number = ntohl (ack_message->sequence_number);
2176 LOG (GNUNET_ERROR_TYPE_DEBUG,
2177 "%s: Read sequence number %u\n",
2178 GNUNET_i2s (&socket->other_peer),
2179 (unsigned int) socket->read_sequence_number);
2180 socket->receiver_window_available =
2181 ntohl (ack_message->receiver_window_size);
2182 set_state_established (NULL, socket);
2185 LOG (GNUNET_ERROR_TYPE_DEBUG,
2186 "Client sent HELLO_ACK when in state %d\n", socket->state);
2193 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_RESET
2195 * @param cls the closure
2196 * @param tunnel connection to the other end
2197 * @param tunnel_ctx the socket
2198 * @param sender who sent the message
2199 * @param message the actual message
2200 * @param atsi performance data for the connection
2201 * @return GNUNET_OK to keep the connection open,
2202 * GNUNET_SYSERR to close it (signal serious error)
2205 server_handle_reset (void *cls,
2206 struct GNUNET_MESH_Tunnel *tunnel,
2208 const struct GNUNET_PeerIdentity *sender,
2209 const struct GNUNET_MessageHeader *message,
2210 const struct GNUNET_ATS_Information*atsi)
2212 // struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2219 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE
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 (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_transmit_close (socket,
2243 (struct GNUNET_STREAM_MessageHeader *)message,
2249 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE_ACK
2251 * @param cls the closure
2252 * @param tunnel connection to the other end
2253 * @param tunnel_ctx the socket
2254 * @param sender who sent the message
2255 * @param message the actual message
2256 * @param atsi performance data for the connection
2257 * @return GNUNET_OK to keep the connection open,
2258 * GNUNET_SYSERR to close it (signal serious error)
2261 server_handle_transmit_close_ack (void *cls,
2262 struct GNUNET_MESH_Tunnel *tunnel,
2264 const struct GNUNET_PeerIdentity *sender,
2265 const struct GNUNET_MessageHeader *message,
2266 const struct GNUNET_ATS_Information*atsi)
2268 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2270 return handle_generic_close_ack (socket,
2273 (const struct GNUNET_STREAM_MessageHeader *)
2281 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE
2283 * @param cls the closure
2284 * @param tunnel connection to the other end
2285 * @param tunnel_ctx the socket
2286 * @param sender who sent the message
2287 * @param message the actual message
2288 * @param atsi performance data for the connection
2289 * @return GNUNET_OK to keep the connection open,
2290 * GNUNET_SYSERR to close it (signal serious error)
2293 server_handle_receive_close (void *cls,
2294 struct GNUNET_MESH_Tunnel *tunnel,
2296 const struct GNUNET_PeerIdentity *sender,
2297 const struct GNUNET_MessageHeader *message,
2298 const struct GNUNET_ATS_Information*atsi)
2300 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2303 handle_receive_close (socket,
2306 (const struct GNUNET_STREAM_MessageHeader *) message,
2312 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE_ACK
2314 * @param cls the closure
2315 * @param tunnel connection to the other end
2316 * @param tunnel_ctx the socket
2317 * @param sender who sent the message
2318 * @param message the actual message
2319 * @param atsi performance data for the connection
2320 * @return GNUNET_OK to keep the connection open,
2321 * GNUNET_SYSERR to close it (signal serious error)
2324 server_handle_receive_close_ack (void *cls,
2325 struct GNUNET_MESH_Tunnel *tunnel,
2327 const struct GNUNET_PeerIdentity *sender,
2328 const struct GNUNET_MessageHeader *message,
2329 const struct GNUNET_ATS_Information*atsi)
2331 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2333 return handle_generic_close_ack (socket,
2336 (const struct GNUNET_STREAM_MessageHeader *)
2344 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_CLOSE
2346 * @param cls the listen socket (from GNUNET_MESH_connect in
2347 * GNUNET_STREAM_listen)
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 (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_close (socket,
2369 (const struct GNUNET_STREAM_MessageHeader *) message,
2375 * Server's message handler for GNUNET_MESSAGE_TYPE_STREAM_CLOSE_ACK
2377 * @param cls the closure
2378 * @param tunnel connection to the other end
2379 * @param tunnel_ctx the socket
2380 * @param sender who sent the message
2381 * @param message the actual message
2382 * @param atsi performance data for the connection
2383 * @return GNUNET_OK to keep the connection open,
2384 * GNUNET_SYSERR to close it (signal serious error)
2387 server_handle_close_ack (void *cls,
2388 struct GNUNET_MESH_Tunnel *tunnel,
2390 const struct GNUNET_PeerIdentity *sender,
2391 const struct GNUNET_MessageHeader *message,
2392 const struct GNUNET_ATS_Information*atsi)
2394 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2396 return handle_generic_close_ack (socket,
2399 (const struct GNUNET_STREAM_MessageHeader *)
2407 * Handler for DATA_ACK messages
2409 * @param socket the socket through which the ack was received
2410 * @param tunnel connection to the other end
2411 * @param sender who sent the message
2412 * @param ack the acknowledgment message
2413 * @param atsi performance data for the connection
2414 * @return GNUNET_OK to keep the connection open,
2415 * GNUNET_SYSERR to close it (signal serious error)
2418 handle_ack (struct GNUNET_STREAM_Socket *socket,
2419 struct GNUNET_MESH_Tunnel *tunnel,
2420 const struct GNUNET_PeerIdentity *sender,
2421 const struct GNUNET_STREAM_AckMessage *ack,
2422 const struct GNUNET_ATS_Information*atsi)
2424 unsigned int packet;
2425 int need_retransmission;
2426 uint32_t sequence_difference;
2428 if (0 != memcmp (sender,
2429 &socket->other_peer,
2430 sizeof (struct GNUNET_PeerIdentity)))
2432 LOG (GNUNET_ERROR_TYPE_DEBUG,
2433 "%s: Received ACK from non-confirming peer\n",
2434 GNUNET_i2s (&socket->other_peer));
2437 switch (socket->state)
2439 case (STATE_ESTABLISHED):
2440 case (STATE_RECEIVE_CLOSED):
2441 case (STATE_RECEIVE_CLOSE_WAIT):
2442 if (NULL == socket->write_handle)
2444 LOG (GNUNET_ERROR_TYPE_DEBUG,
2445 "%s: Received DATA_ACK when write_handle is NULL\n",
2446 GNUNET_i2s (&socket->other_peer));
2449 sequence_difference =
2450 socket->write_sequence_number - ntohl (ack->base_sequence_number);
2451 if (!(sequence_difference <= GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH))
2453 LOG (GNUNET_ERROR_TYPE_DEBUG,
2454 "%s: Received DATA_ACK with unexpected base sequence number\n",
2455 GNUNET_i2s (&socket->other_peer));
2456 LOG (GNUNET_ERROR_TYPE_DEBUG,
2457 "%s: Current write sequence: %u; Ack's base sequence: %u\n",
2458 GNUNET_i2s (&socket->other_peer),
2459 socket->write_sequence_number,
2460 ntohl (ack->base_sequence_number));
2463 /* FIXME: include the case when write_handle is cancelled - ignore the
2465 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s: Received DATA_ACK from %s\n",
2466 GNUNET_i2s (&socket->other_peer), GNUNET_i2s (&socket->other_peer));
2467 /* Cancel the retransmission task */
2468 if (GNUNET_SCHEDULER_NO_TASK != socket->data_retransmission_task_id)
2470 GNUNET_SCHEDULER_cancel (socket->data_retransmission_task_id);
2471 socket->data_retransmission_task_id = GNUNET_SCHEDULER_NO_TASK;
2473 for (packet=0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
2475 if (NULL == socket->write_handle->messages[packet]) break;
2476 /* BS: Base sequence from ack; PS: sequence num of current packet */
2477 sequence_difference = ntohl (ack->base_sequence_number)
2478 - ntohl (socket->write_handle->messages[packet]->sequence_number);
2479 if ((0 == sequence_difference) ||
2480 (GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH < sequence_difference))
2481 continue; /* The message in our handle is not yet received */
2482 /* case where BS = PS + GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH */
2483 /* sequence_difference <= GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH */
2484 ackbitmap_modify_bit (&socket->write_handle->ack_bitmap,
2485 packet, GNUNET_YES);
2487 /* Update the receive window remaining
2488 FIXME : Should update with the value from a data ack with greater
2490 socket->receiver_window_available =
2491 ntohl (ack->receive_window_remaining);
2492 /* Check if we have received all acknowledgements */
2493 need_retransmission = GNUNET_NO;
2494 for (packet=0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
2496 if (NULL == socket->write_handle->messages[packet]) break;
2497 if (GNUNET_YES != ackbitmap_is_bit_set
2498 (&socket->write_handle->ack_bitmap,packet))
2500 need_retransmission = GNUNET_YES;
2504 if (GNUNET_YES == need_retransmission)
2506 write_data (socket);
2508 else /* We have to call the write continuation callback now */
2510 struct GNUNET_STREAM_IOWriteHandle *write_handle;
2512 /* Free the packets */
2513 for (packet=0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
2515 GNUNET_free_non_null (socket->write_handle->messages[packet]);
2517 write_handle = socket->write_handle;
2518 socket->write_handle = NULL;
2519 if (NULL != write_handle->write_cont)
2520 write_handle->write_cont (write_handle->write_cont_cls,
2522 write_handle->size);
2523 /* We are done with the write handle - Freeing it */
2524 GNUNET_free (write_handle);
2525 LOG (GNUNET_ERROR_TYPE_DEBUG,
2526 "%s: Write completion callback completed\n",
2527 GNUNET_i2s (&socket->other_peer));
2538 * Handler for DATA_ACK messages
2540 * @param cls the 'struct GNUNET_STREAM_Socket'
2541 * @param tunnel connection to the other end
2542 * @param tunnel_ctx unused
2543 * @param sender who sent the message
2544 * @param message the actual message
2545 * @param atsi performance data for the connection
2546 * @return GNUNET_OK to keep the connection open,
2547 * GNUNET_SYSERR to close it (signal serious error)
2550 client_handle_ack (void *cls,
2551 struct GNUNET_MESH_Tunnel *tunnel,
2553 const struct GNUNET_PeerIdentity *sender,
2554 const struct GNUNET_MessageHeader *message,
2555 const struct GNUNET_ATS_Information*atsi)
2557 struct GNUNET_STREAM_Socket *socket = cls;
2558 const struct GNUNET_STREAM_AckMessage *ack = (const struct GNUNET_STREAM_AckMessage *) message;
2560 return handle_ack (socket, tunnel, sender, ack, atsi);
2565 * Handler for DATA_ACK messages
2567 * @param cls the server's listen socket
2568 * @param tunnel connection to the other end
2569 * @param tunnel_ctx pointer to the 'struct GNUNET_STREAM_Socket*'
2570 * @param sender who sent the message
2571 * @param message the actual message
2572 * @param atsi performance data for the connection
2573 * @return GNUNET_OK to keep the connection open,
2574 * GNUNET_SYSERR to close it (signal serious error)
2577 server_handle_ack (void *cls,
2578 struct GNUNET_MESH_Tunnel *tunnel,
2580 const struct GNUNET_PeerIdentity *sender,
2581 const struct GNUNET_MessageHeader *message,
2582 const struct GNUNET_ATS_Information*atsi)
2584 struct GNUNET_STREAM_Socket *socket = *tunnel_ctx;
2585 const struct GNUNET_STREAM_AckMessage *ack = (const struct GNUNET_STREAM_AckMessage *) message;
2587 return handle_ack (socket, tunnel, sender, ack, atsi);
2592 * For client message handlers, the stream socket is in the
2595 static struct GNUNET_MESH_MessageHandler client_message_handlers[] = {
2596 {&client_handle_data, GNUNET_MESSAGE_TYPE_STREAM_DATA, 0},
2597 {&client_handle_ack, GNUNET_MESSAGE_TYPE_STREAM_ACK,
2598 sizeof (struct GNUNET_STREAM_AckMessage) },
2599 {&client_handle_hello_ack, GNUNET_MESSAGE_TYPE_STREAM_HELLO_ACK,
2600 sizeof (struct GNUNET_STREAM_HelloAckMessage)},
2601 {&client_handle_reset, GNUNET_MESSAGE_TYPE_STREAM_RESET,
2602 sizeof (struct GNUNET_STREAM_MessageHeader)},
2603 {&client_handle_transmit_close, GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE,
2604 sizeof (struct GNUNET_STREAM_MessageHeader)},
2605 {&client_handle_transmit_close_ack, GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE_ACK,
2606 sizeof (struct GNUNET_STREAM_MessageHeader)},
2607 {&client_handle_receive_close, GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE,
2608 sizeof (struct GNUNET_STREAM_MessageHeader)},
2609 {&client_handle_receive_close_ack, GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE_ACK,
2610 sizeof (struct GNUNET_STREAM_MessageHeader)},
2611 {&client_handle_close, GNUNET_MESSAGE_TYPE_STREAM_CLOSE,
2612 sizeof (struct GNUNET_STREAM_MessageHeader)},
2613 {&client_handle_close_ack, GNUNET_MESSAGE_TYPE_STREAM_CLOSE_ACK,
2614 sizeof (struct GNUNET_STREAM_MessageHeader)},
2620 * For server message handlers, the stream socket is in the
2621 * tunnel context, and the listen socket in the closure argument.
2623 static struct GNUNET_MESH_MessageHandler server_message_handlers[] = {
2624 {&server_handle_data, GNUNET_MESSAGE_TYPE_STREAM_DATA, 0},
2625 {&server_handle_ack, GNUNET_MESSAGE_TYPE_STREAM_ACK,
2626 sizeof (struct GNUNET_STREAM_AckMessage) },
2627 {&server_handle_hello, GNUNET_MESSAGE_TYPE_STREAM_HELLO,
2628 sizeof (struct GNUNET_STREAM_MessageHeader)},
2629 {&server_handle_hello_ack, GNUNET_MESSAGE_TYPE_STREAM_HELLO_ACK,
2630 sizeof (struct GNUNET_STREAM_HelloAckMessage)},
2631 {&server_handle_reset, GNUNET_MESSAGE_TYPE_STREAM_RESET,
2632 sizeof (struct GNUNET_STREAM_MessageHeader)},
2633 {&server_handle_transmit_close, GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE,
2634 sizeof (struct GNUNET_STREAM_MessageHeader)},
2635 {&server_handle_transmit_close_ack, GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE_ACK,
2636 sizeof (struct GNUNET_STREAM_MessageHeader)},
2637 {&server_handle_receive_close, GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE,
2638 sizeof (struct GNUNET_STREAM_MessageHeader)},
2639 {&server_handle_receive_close_ack, GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE_ACK,
2640 sizeof (struct GNUNET_STREAM_MessageHeader)},
2641 {&server_handle_close, GNUNET_MESSAGE_TYPE_STREAM_CLOSE,
2642 sizeof (struct GNUNET_STREAM_MessageHeader)},
2643 {&server_handle_close_ack, GNUNET_MESSAGE_TYPE_STREAM_CLOSE_ACK,
2644 sizeof (struct GNUNET_STREAM_MessageHeader)},
2650 * Function called when our target peer is connected to our tunnel
2652 * @param cls the socket for which this tunnel is created
2653 * @param peer the peer identity of the target
2654 * @param atsi performance data for the connection
2657 mesh_peer_connect_callback (void *cls,
2658 const struct GNUNET_PeerIdentity *peer,
2659 const struct GNUNET_ATS_Information * atsi)
2661 struct GNUNET_STREAM_Socket *socket = cls;
2662 struct GNUNET_STREAM_MessageHeader *message;
2664 if (0 != memcmp (peer,
2665 &socket->other_peer,
2666 sizeof (struct GNUNET_PeerIdentity)))
2668 LOG (GNUNET_ERROR_TYPE_DEBUG,
2669 "%s: A peer which is not our target has connected to our tunnel\n",
2673 LOG (GNUNET_ERROR_TYPE_DEBUG,
2674 "%s: Target peer %s connected\n",
2675 GNUNET_i2s (&socket->other_peer),
2676 GNUNET_i2s (&socket->other_peer));
2677 /* Set state to INIT */
2678 socket->state = STATE_INIT;
2679 /* Send HELLO message */
2680 message = generate_hello ();
2681 queue_message (socket, message, &set_state_hello_wait, NULL, GNUNET_NO);
2682 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK ==
2683 socket->control_retransmission_task_id);
2684 socket->control_retransmission_task_id =
2685 GNUNET_SCHEDULER_add_delayed (socket->retransmit_timeout,
2686 &control_retransmission_task, socket);
2691 * Function called when our target peer is disconnected from our tunnel
2693 * @param cls the socket associated which this tunnel
2694 * @param peer the peer identity of the target
2697 mesh_peer_disconnect_callback (void *cls,
2698 const struct GNUNET_PeerIdentity *peer)
2700 struct GNUNET_STREAM_Socket *socket=cls;
2702 /* If the state is SHUTDOWN its ok; else set the state of the socket to SYSERR */
2703 LOG (GNUNET_ERROR_TYPE_DEBUG,
2704 "%s: Other peer %s disconnected \n",
2705 GNUNET_i2s (&socket->other_peer),
2706 GNUNET_i2s (&socket->other_peer));
2711 * Method called whenever a peer creates a tunnel to us
2713 * @param cls closure
2714 * @param tunnel new handle to the tunnel
2715 * @param initiator peer that started the tunnel
2716 * @param atsi performance information for the tunnel
2717 * @return initial tunnel context for the tunnel
2718 * (can be NULL -- that's not an error)
2721 new_tunnel_notify (void *cls,
2722 struct GNUNET_MESH_Tunnel *tunnel,
2723 const struct GNUNET_PeerIdentity *initiator,
2724 const struct GNUNET_ATS_Information *atsi)
2726 struct GNUNET_STREAM_ListenSocket *lsocket = cls;
2727 struct GNUNET_STREAM_Socket *socket;
2729 /* FIXME: If a tunnel is already created, we should not accept new tunnels
2730 from the same peer again until the socket is closed */
2732 if (GNUNET_NO == lsocket->listening)
2734 GNUNET_MESH_tunnel_destroy (tunnel);
2737 socket = GNUNET_malloc (sizeof (struct GNUNET_STREAM_Socket));
2738 socket->other_peer = *initiator;
2739 socket->tunnel = tunnel;
2740 socket->session_id = 0; /* FIXME */
2741 socket->state = STATE_INIT;
2742 socket->lsocket = lsocket;
2743 socket->retransmit_timeout = lsocket->retransmit_timeout;
2744 socket->testing_active = lsocket->testing_active;
2745 socket->testing_set_write_sequence_number_value =
2746 lsocket->testing_set_write_sequence_number_value;
2747 socket->max_payload_size = lsocket->max_payload_size;
2748 LOG (GNUNET_ERROR_TYPE_DEBUG,
2749 "%s: Peer %s initiated tunnel to us\n",
2750 GNUNET_i2s (&socket->other_peer),
2751 GNUNET_i2s (&socket->other_peer));
2752 /* 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 /* Stop Tasks using socket->tunnel */
2794 if (GNUNET_SCHEDULER_NO_TASK != socket->ack_task_id)
2796 GNUNET_SCHEDULER_cancel (socket->ack_task_id);
2797 socket->ack_task_id = GNUNET_SCHEDULER_NO_TASK;
2799 if (GNUNET_SCHEDULER_NO_TASK != socket->data_retransmission_task_id)
2801 GNUNET_SCHEDULER_cancel (socket->data_retransmission_task_id);
2802 socket->data_retransmission_task_id = GNUNET_SCHEDULER_NO_TASK;
2804 /* FIXME: Cancel all other tasks using socket->tunnel */
2805 socket->tunnel = NULL;
2810 * Callback to signal timeout on lockmanager lock acquire
2812 * @param cls the ListenSocket
2813 * @param tc the scheduler task context
2816 lockmanager_acquire_timeout (void *cls,
2817 const struct GNUNET_SCHEDULER_TaskContext *tc)
2819 struct GNUNET_STREAM_ListenSocket *lsocket = cls;
2820 GNUNET_STREAM_ListenCallback listen_cb;
2821 void *listen_cb_cls;
2823 lsocket->lockmanager_acquire_timeout_task = GNUNET_SCHEDULER_NO_TASK;
2824 listen_cb = lsocket->listen_cb;
2825 listen_cb_cls = lsocket->listen_cb_cls;
2826 GNUNET_STREAM_listen_close (lsocket);
2827 if (NULL != listen_cb)
2828 listen_cb (listen_cb_cls, NULL, NULL);
2833 * Callback to notify us on the status changes on app_port lock
2835 * @param cls the ListenSocket
2836 * @param domain the domain name of the lock
2837 * @param lock the app_port
2838 * @param status the current status of the lock
2841 lock_status_change_cb (void *cls, const char *domain, uint32_t lock,
2842 enum GNUNET_LOCKMANAGER_Status status)
2844 struct GNUNET_STREAM_ListenSocket *lsocket = cls;
2846 GNUNET_assert (lock == (uint32_t) lsocket->port);
2847 if (GNUNET_LOCKMANAGER_SUCCESS == status)
2849 lsocket->listening = GNUNET_YES;
2850 if (GNUNET_SCHEDULER_NO_TASK != lsocket->lockmanager_acquire_timeout_task)
2852 GNUNET_SCHEDULER_cancel (lsocket->lockmanager_acquire_timeout_task);
2853 lsocket->lockmanager_acquire_timeout_task = GNUNET_SCHEDULER_NO_TASK;
2855 if (NULL == lsocket->mesh)
2857 GNUNET_MESH_ApplicationType ports[] = {lsocket->port, 0};
2859 lsocket->mesh = GNUNET_MESH_connect (lsocket->cfg,
2860 lsocket, /* Closure */
2863 server_message_handlers,
2865 GNUNET_assert (NULL != lsocket->mesh);
2866 if (NULL != lsocket->listen_ok_cb)
2868 (void) lsocket->listen_ok_cb ();
2872 if (GNUNET_LOCKMANAGER_RELEASE == status)
2873 lsocket->listening = GNUNET_NO;
2883 * Tries to open a stream to the target peer
2885 * @param cfg configuration to use
2886 * @param target the target peer to which the stream has to be opened
2887 * @param app_port the application port number which uniquely identifies this
2889 * @param open_cb this function will be called after stream has be established;
2891 * @param open_cb_cls the closure for open_cb
2892 * @param ... options to the stream, terminated by GNUNET_STREAM_OPTION_END
2893 * @return if successful it returns the stream socket; NULL if stream cannot be
2896 struct GNUNET_STREAM_Socket *
2897 GNUNET_STREAM_open (const struct GNUNET_CONFIGURATION_Handle *cfg,
2898 const struct GNUNET_PeerIdentity *target,
2899 GNUNET_MESH_ApplicationType app_port,
2900 GNUNET_STREAM_OpenCallback open_cb,
2904 struct GNUNET_STREAM_Socket *socket;
2905 enum GNUNET_STREAM_Option option;
2906 GNUNET_MESH_ApplicationType ports[] = {app_port, 0};
2908 uint16_t payload_size;
2910 LOG (GNUNET_ERROR_TYPE_DEBUG,
2912 GNUNET_assert (NULL != open_cb);
2913 socket = GNUNET_malloc (sizeof (struct GNUNET_STREAM_Socket));
2914 socket->other_peer = *target;
2915 socket->open_cb = open_cb;
2916 socket->open_cls = open_cb_cls;
2918 socket->retransmit_timeout = TIME_REL_SECS (default_timeout);
2919 socket->testing_active = GNUNET_NO;
2920 socket->max_payload_size = DEFAULT_MAX_PAYLOAD_SIZE;
2921 va_start (vargs, open_cb_cls); /* Parse variable args */
2923 option = va_arg (vargs, enum GNUNET_STREAM_Option);
2926 case GNUNET_STREAM_OPTION_INITIAL_RETRANSMIT_TIMEOUT:
2927 /* Expect struct GNUNET_TIME_Relative */
2928 socket->retransmit_timeout = va_arg (vargs,
2929 struct GNUNET_TIME_Relative);
2931 case GNUNET_STREAM_OPTION_TESTING_SET_WRITE_SEQUENCE_NUMBER:
2932 socket->testing_active = GNUNET_YES;
2933 socket->testing_set_write_sequence_number_value = va_arg (vargs,
2936 case GNUNET_STREAM_OPTION_LISTEN_TIMEOUT:
2937 GNUNET_break (0); /* Option irrelevant in STREAM_open */
2939 case GNUNET_STREAM_OPTION_SIGNAL_LISTEN_SUCCESS:
2940 GNUNET_break (0); /* Option irrelevant in STREAM_open */
2942 case GNUNET_STREAM_OPTION_MAX_PAYLOAD_SIZE:
2943 payload_size = (uint16_t) va_arg (vargs, unsigned int);
2944 GNUNET_assert (0 != payload_size);
2945 if (payload_size < socket->max_payload_size)
2946 socket->max_payload_size = payload_size;
2948 case GNUNET_STREAM_OPTION_END:
2951 } while (GNUNET_STREAM_OPTION_END != option);
2952 va_end (vargs); /* End of variable args parsing */
2953 socket->mesh = GNUNET_MESH_connect (cfg, /* the configuration handle */
2955 NULL, /* No inbound tunnel handler */
2956 NULL, /* No in-tunnel cleaner */
2957 client_message_handlers,
2958 ports); /* We don't get inbound tunnels */
2959 if (NULL == socket->mesh) /* Fail if we cannot connect to mesh */
2961 GNUNET_free (socket);
2964 /* Now create the mesh tunnel to target */
2965 LOG (GNUNET_ERROR_TYPE_DEBUG, "Creating MESH Tunnel\n");
2966 socket->tunnel = GNUNET_MESH_tunnel_create (socket->mesh,
2967 NULL, /* Tunnel context */
2968 &mesh_peer_connect_callback,
2969 &mesh_peer_disconnect_callback,
2971 GNUNET_assert (NULL != socket->tunnel);
2972 GNUNET_MESH_peer_request_connect_add (socket->tunnel,
2973 &socket->other_peer);
2974 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s() END\n", __func__);
2980 * Shutdown the stream for reading or writing (similar to man 2 shutdown).
2982 * @param socket the stream socket
2983 * @param operation SHUT_RD, SHUT_WR or SHUT_RDWR
2984 * @param completion_cb the callback that will be called upon successful
2985 * shutdown of given operation
2986 * @param completion_cls the closure for the completion callback
2987 * @return the shutdown handle
2989 struct GNUNET_STREAM_ShutdownHandle *
2990 GNUNET_STREAM_shutdown (struct GNUNET_STREAM_Socket *socket,
2992 GNUNET_STREAM_ShutdownCompletion completion_cb,
2993 void *completion_cls)
2995 struct GNUNET_STREAM_ShutdownHandle *handle;
2996 struct GNUNET_STREAM_MessageHeader *msg;
2998 GNUNET_assert (NULL == socket->shutdown_handle);
3000 handle = GNUNET_malloc (sizeof (struct GNUNET_STREAM_ShutdownHandle));
3001 handle->socket = socket;
3002 handle->completion_cb = completion_cb;
3003 handle->completion_cls = completion_cls;
3004 socket->shutdown_handle = handle;
3006 msg = GNUNET_malloc (sizeof (struct GNUNET_STREAM_MessageHeader));
3007 msg->header.size = htons (sizeof (struct GNUNET_STREAM_MessageHeader));
3011 handle->operation = SHUT_RD;
3012 if (NULL != socket->read_handle)
3013 LOG (GNUNET_ERROR_TYPE_WARNING,
3014 "Existing read handle should be cancelled before shutting"
3016 msg->header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_RECEIVE_CLOSE);
3017 queue_message (socket, msg, &set_state_receive_close_wait, NULL,
3021 handle->operation = SHUT_WR;
3022 if (NULL != socket->write_handle)
3023 LOG (GNUNET_ERROR_TYPE_WARNING,
3024 "Existing write handle should be cancelled before shutting"
3026 msg->header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_TRANSMIT_CLOSE);
3027 queue_message (socket, msg, &set_state_transmit_close_wait, NULL,
3031 handle->operation = SHUT_RDWR;
3032 if (NULL != socket->write_handle)
3033 LOG (GNUNET_ERROR_TYPE_WARNING,
3034 "Existing write handle should be cancelled before shutting"
3036 if (NULL != socket->read_handle)
3037 LOG (GNUNET_ERROR_TYPE_WARNING,
3038 "Existing read handle should be cancelled before shutting"
3040 msg->header.type = htons (GNUNET_MESSAGE_TYPE_STREAM_CLOSE);
3041 queue_message (socket, msg, &set_state_close_wait, NULL, GNUNET_NO);
3044 LOG (GNUNET_ERROR_TYPE_WARNING,
3045 "GNUNET_STREAM_shutdown called with invalid value for "
3046 "parameter operation -- Ignoring\n");
3048 GNUNET_free (handle);
3051 handle->close_msg_retransmission_task_id =
3052 GNUNET_SCHEDULER_add_delayed (socket->retransmit_timeout,
3053 &close_msg_retransmission_task,
3060 * Cancels a pending shutdown
3062 * @param handle the shutdown handle returned from GNUNET_STREAM_shutdown
3065 GNUNET_STREAM_shutdown_cancel (struct GNUNET_STREAM_ShutdownHandle *handle)
3067 if (GNUNET_SCHEDULER_NO_TASK != handle->close_msg_retransmission_task_id)
3068 GNUNET_SCHEDULER_cancel (handle->close_msg_retransmission_task_id);
3069 handle->socket->shutdown_handle = NULL;
3070 GNUNET_free (handle);
3077 * @param socket the stream socket
3080 GNUNET_STREAM_close (struct GNUNET_STREAM_Socket *socket)
3082 struct MessageQueue *head;
3084 if (NULL != socket->read_handle)
3086 LOG (GNUNET_ERROR_TYPE_WARNING,
3087 "Closing STREAM socket when a read handle is pending\n");
3088 GNUNET_STREAM_io_read_cancel (socket->read_handle);
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;
3097 if (socket->read_task_id != GNUNET_SCHEDULER_NO_TASK)
3099 /* socket closed with read task pending!? */
3101 GNUNET_SCHEDULER_cancel (socket->read_task_id);
3102 socket->read_task_id = GNUNET_SCHEDULER_NO_TASK;
3104 /* Terminate the ack'ing tasks if they are still present */
3105 if (socket->ack_task_id != GNUNET_SCHEDULER_NO_TASK)
3107 GNUNET_SCHEDULER_cancel (socket->ack_task_id);
3108 socket->ack_task_id = GNUNET_SCHEDULER_NO_TASK;
3110 /* Terminate the control retransmission tasks */
3111 if (GNUNET_SCHEDULER_NO_TASK != socket->control_retransmission_task_id)
3113 GNUNET_SCHEDULER_cancel (socket->control_retransmission_task_id);
3115 /* Clear Transmit handles */
3116 if (NULL != socket->transmit_handle)
3118 GNUNET_MESH_notify_transmit_ready_cancel (socket->transmit_handle);
3119 socket->transmit_handle = NULL;
3121 /* Clear existing message queue */
3122 while (NULL != (head = socket->queue_head)) {
3123 GNUNET_CONTAINER_DLL_remove (socket->queue_head,
3126 GNUNET_free (head->message);
3129 /* Close associated tunnel */
3130 if (NULL != socket->tunnel)
3132 GNUNET_MESH_tunnel_destroy (socket->tunnel);
3133 socket->tunnel = NULL;
3135 /* Close mesh connection */
3136 if (NULL != socket->mesh && NULL == socket->lsocket)
3138 GNUNET_MESH_disconnect (socket->mesh);
3139 socket->mesh = NULL;
3141 /* Release receive buffer */
3142 if (NULL != socket->receive_buffer)
3144 GNUNET_free (socket->receive_buffer);
3146 GNUNET_free (socket);
3151 * Listens for stream connections for a specific application ports
3153 * @param cfg the configuration to use
3154 * @param app_port the application port for which new streams will be accepted
3155 * @param listen_cb this function will be called when a peer tries to establish
3157 * @param listen_cb_cls closure for listen_cb
3158 * @param ... options to the stream, terminated by GNUNET_STREAM_OPTION_END
3159 * @return listen socket, NULL for any error
3161 struct GNUNET_STREAM_ListenSocket *
3162 GNUNET_STREAM_listen (const struct GNUNET_CONFIGURATION_Handle *cfg,
3163 GNUNET_MESH_ApplicationType app_port,
3164 GNUNET_STREAM_ListenCallback listen_cb,
3165 void *listen_cb_cls,
3168 /* FIXME: Add variable args for passing configration options? */
3169 struct GNUNET_STREAM_ListenSocket *lsocket;
3170 struct GNUNET_TIME_Relative listen_timeout;
3171 enum GNUNET_STREAM_Option option;
3173 uint16_t payload_size;
3175 GNUNET_assert (NULL != listen_cb);
3176 lsocket = GNUNET_malloc (sizeof (struct GNUNET_STREAM_ListenSocket));
3177 lsocket->cfg = GNUNET_CONFIGURATION_dup (cfg);
3178 lsocket->lockmanager = GNUNET_LOCKMANAGER_connect (lsocket->cfg);
3179 if (NULL == lsocket->lockmanager)
3181 GNUNET_CONFIGURATION_destroy (lsocket->cfg);
3182 GNUNET_free (lsocket);
3185 lsocket->listening = GNUNET_NO;/* We listen when we get a lock on app_port */
3187 lsocket->retransmit_timeout = TIME_REL_SECS (default_timeout);
3188 lsocket->testing_active = GNUNET_NO;
3189 lsocket->listen_ok_cb = NULL;
3190 lsocket->max_payload_size = DEFAULT_MAX_PAYLOAD_SIZE;
3191 listen_timeout = TIME_REL_SECS (60); /* A minute for listen timeout */
3192 va_start (vargs, listen_cb_cls);
3194 option = va_arg (vargs, enum GNUNET_STREAM_Option);
3197 case GNUNET_STREAM_OPTION_INITIAL_RETRANSMIT_TIMEOUT:
3198 lsocket->retransmit_timeout = va_arg (vargs,
3199 struct GNUNET_TIME_Relative);
3201 case GNUNET_STREAM_OPTION_TESTING_SET_WRITE_SEQUENCE_NUMBER:
3202 lsocket->testing_active = GNUNET_YES;
3203 lsocket->testing_set_write_sequence_number_value = va_arg (vargs,
3206 case GNUNET_STREAM_OPTION_LISTEN_TIMEOUT:
3207 listen_timeout = GNUNET_TIME_relative_multiply
3208 (GNUNET_TIME_UNIT_MILLISECONDS, va_arg (vargs, uint32_t));
3210 case GNUNET_STREAM_OPTION_SIGNAL_LISTEN_SUCCESS:
3211 lsocket->listen_ok_cb = va_arg (vargs,
3212 GNUNET_STREAM_ListenSuccessCallback);
3214 case GNUNET_STREAM_OPTION_MAX_PAYLOAD_SIZE:
3215 payload_size = (uint16_t) va_arg (vargs, unsigned int);
3216 GNUNET_assert (0 != payload_size);
3217 if (payload_size < lsocket->max_payload_size)
3218 lsocket->max_payload_size = payload_size;
3220 case GNUNET_STREAM_OPTION_END:
3223 } while (GNUNET_STREAM_OPTION_END != option);
3225 lsocket->port = app_port;
3226 lsocket->listen_cb = listen_cb;
3227 lsocket->listen_cb_cls = listen_cb_cls;
3228 lsocket->locking_request =
3229 GNUNET_LOCKMANAGER_acquire_lock (lsocket->lockmanager, locking_domain,
3230 (uint32_t) lsocket->port,
3231 &lock_status_change_cb, lsocket);
3232 lsocket->lockmanager_acquire_timeout_task =
3233 GNUNET_SCHEDULER_add_delayed (listen_timeout,
3234 &lockmanager_acquire_timeout, lsocket);
3240 * Closes the listen socket
3242 * @param lsocket the listen socket
3245 GNUNET_STREAM_listen_close (struct GNUNET_STREAM_ListenSocket *lsocket)
3247 /* Close MESH connection */
3248 if (NULL != lsocket->mesh)
3249 GNUNET_MESH_disconnect (lsocket->mesh);
3250 GNUNET_CONFIGURATION_destroy (lsocket->cfg);
3251 if (GNUNET_SCHEDULER_NO_TASK != lsocket->lockmanager_acquire_timeout_task)
3252 GNUNET_SCHEDULER_cancel (lsocket->lockmanager_acquire_timeout_task);
3253 if (NULL != lsocket->locking_request)
3254 GNUNET_LOCKMANAGER_cancel_request (lsocket->locking_request);
3255 if (NULL != lsocket->lockmanager)
3256 GNUNET_LOCKMANAGER_disconnect (lsocket->lockmanager);
3257 GNUNET_free (lsocket);
3262 * Tries to write the given data to the stream. The maximum size of data that
3263 * can be written as part of a write operation is (64 * (64000 - sizeof (struct
3264 * GNUNET_STREAM_DataMessage))). If size is greater than this it is not an API
3265 * violation, however only the said number of maximum bytes will be written.
3267 * @param socket the socket representing a stream
3268 * @param data the data buffer from where the data is written into the stream
3269 * @param size the number of bytes to be written from the data buffer
3270 * @param timeout the timeout period
3271 * @param write_cont the function to call upon writing some bytes into the
3273 * @param write_cont_cls the closure
3275 * @return handle to cancel the operation; if a previous write is pending or
3276 * the stream has been shutdown for this operation then write_cont is
3277 * immediately called and NULL is returned.
3279 struct GNUNET_STREAM_IOWriteHandle *
3280 GNUNET_STREAM_write (struct GNUNET_STREAM_Socket *socket,
3283 struct GNUNET_TIME_Relative timeout,
3284 GNUNET_STREAM_CompletionContinuation write_cont,
3285 void *write_cont_cls)
3287 struct GNUNET_STREAM_IOWriteHandle *io_handle;
3288 struct GNUNET_STREAM_DataMessage *data_msg;
3290 struct GNUNET_TIME_Relative ack_deadline;
3291 unsigned int num_needed_packets;
3292 unsigned int packet;
3293 uint32_t packet_size;
3294 uint32_t payload_size;
3295 uint16_t max_data_packet_size;
3297 LOG (GNUNET_ERROR_TYPE_DEBUG,
3299 if (NULL != socket->write_handle)
3304 switch (socket->state)
3306 case STATE_TRANSMIT_CLOSED:
3307 case STATE_TRANSMIT_CLOSE_WAIT:
3309 case STATE_CLOSE_WAIT:
3310 if (NULL != write_cont)
3311 write_cont (write_cont_cls, GNUNET_STREAM_SHUTDOWN, 0);
3312 LOG (GNUNET_ERROR_TYPE_DEBUG,
3313 "%s() END\n", __func__);
3317 case STATE_HELLO_WAIT:
3318 if (NULL != write_cont)
3319 /* FIXME: GNUNET_STREAM_SYSERR?? */
3320 write_cont (write_cont_cls, GNUNET_STREAM_SYSERR, 0);
3321 LOG (GNUNET_ERROR_TYPE_DEBUG,
3322 "%s() END\n", __func__);
3324 case STATE_ESTABLISHED:
3325 case STATE_RECEIVE_CLOSED:
3326 case STATE_RECEIVE_CLOSE_WAIT:
3329 if (GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH * socket->max_payload_size < size)
3330 size = GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH * socket->max_payload_size;
3331 num_needed_packets =
3332 (size + (socket->max_payload_size - 1)) / socket->max_payload_size;
3333 io_handle = GNUNET_malloc (sizeof (struct GNUNET_STREAM_IOWriteHandle));
3334 io_handle->socket = socket;
3335 io_handle->write_cont = write_cont;
3336 io_handle->write_cont_cls = write_cont_cls;
3337 io_handle->size = size;
3338 io_handle->packets_sent = 0;
3340 /* FIXME: Remove the fixed delay for ack deadline; Set it to the value
3341 determined from RTT */
3342 ack_deadline = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5);
3343 /* Divide the given buffer into packets for sending */
3344 max_data_packet_size =
3345 socket->max_payload_size + sizeof (struct GNUNET_STREAM_DataMessage);
3346 for (packet=0; packet < num_needed_packets; packet++)
3348 if ((packet + 1) * socket->max_payload_size < size)
3350 payload_size = socket->max_payload_size;
3351 packet_size = max_data_packet_size;
3355 payload_size = size - packet * socket->max_payload_size;
3357 payload_size + sizeof (struct GNUNET_STREAM_DataMessage);
3359 io_handle->messages[packet] = GNUNET_malloc (packet_size);
3360 io_handle->messages[packet]->header.header.size = htons (packet_size);
3361 io_handle->messages[packet]->header.header.type =
3362 htons (GNUNET_MESSAGE_TYPE_STREAM_DATA);
3363 io_handle->messages[packet]->sequence_number =
3364 htonl (socket->write_sequence_number++);
3365 io_handle->messages[packet]->offset = htonl (socket->write_offset);
3366 /* FIXME: Remove the fixed delay for ack deadline; Set it to the value
3367 determined from RTT */
3368 io_handle->messages[packet]->ack_deadline =
3369 GNUNET_TIME_relative_hton (ack_deadline);
3370 data_msg = io_handle->messages[packet];
3371 /* Copy data from given buffer to the packet */
3372 memcpy (&data_msg[1], sweep, payload_size);
3373 sweep += payload_size;
3374 socket->write_offset += payload_size;
3376 /* ack the last data message. FIXME: remove when we figure out how to do this
3378 io_handle->messages[num_needed_packets - 1]->ack_deadline =
3379 GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_ZERO);
3380 socket->write_handle = io_handle;
3381 write_data (socket);
3382 LOG (GNUNET_ERROR_TYPE_DEBUG,
3383 "%s() END\n", __func__);
3389 * Tries to read data from the stream.
3391 * @param socket the socket representing a stream
3392 * @param timeout the timeout period
3393 * @param proc function to call with data (once only)
3394 * @param proc_cls the closure for proc
3396 * @return handle to cancel the operation; if the stream has been shutdown for
3397 * this type of opeartion then the DataProcessor is immediately
3398 * called with GNUNET_STREAM_SHUTDOWN as status and NULL if returned
3400 struct GNUNET_STREAM_IOReadHandle *
3401 GNUNET_STREAM_read (struct GNUNET_STREAM_Socket *socket,
3402 struct GNUNET_TIME_Relative timeout,
3403 GNUNET_STREAM_DataProcessor proc,
3406 struct GNUNET_STREAM_IOReadHandle *read_handle;
3408 LOG (GNUNET_ERROR_TYPE_DEBUG,
3410 GNUNET_i2s (&socket->other_peer),
3412 /* Return NULL if there is already a read handle; the user has to cancel that
3413 first before continuing or has to wait until it is completed */
3414 if (NULL != socket->read_handle)
3416 GNUNET_assert (NULL != proc);
3417 switch (socket->state)
3419 case STATE_RECEIVE_CLOSED:
3420 case STATE_RECEIVE_CLOSE_WAIT:
3422 case STATE_CLOSE_WAIT:
3423 proc (proc_cls, GNUNET_STREAM_SHUTDOWN, NULL, 0);
3424 LOG (GNUNET_ERROR_TYPE_DEBUG,
3426 GNUNET_i2s (&socket->other_peer),
3432 read_handle = GNUNET_malloc (sizeof (struct GNUNET_STREAM_IOReadHandle));
3433 read_handle->proc = proc;
3434 read_handle->proc_cls = proc_cls;
3435 read_handle->socket = socket;
3436 socket->read_handle = read_handle;
3437 /* Check if we have a packet at bitmap 0 */
3438 if (GNUNET_YES == ackbitmap_is_bit_set (&socket->ack_bitmap,
3441 socket->read_task_id = GNUNET_SCHEDULER_add_now (&call_read_processor,
3444 /* Setup the read timeout task */
3445 socket->read_io_timeout_task_id =
3446 GNUNET_SCHEDULER_add_delayed (timeout,
3449 LOG (GNUNET_ERROR_TYPE_DEBUG,
3451 GNUNET_i2s (&socket->other_peer),
3458 * Cancel pending write operation.
3460 * @param ioh handle to operation to cancel
3463 GNUNET_STREAM_io_write_cancel (struct GNUNET_STREAM_IOWriteHandle *ioh)
3465 struct GNUNET_STREAM_Socket *socket = ioh->socket;
3466 unsigned int packet;
3468 GNUNET_assert (NULL != socket->write_handle);
3469 GNUNET_assert (socket->write_handle == ioh);
3471 if (GNUNET_SCHEDULER_NO_TASK != socket->data_retransmission_task_id)
3473 GNUNET_SCHEDULER_cancel (socket->data_retransmission_task_id);
3474 socket->data_retransmission_task_id = GNUNET_SCHEDULER_NO_TASK;
3477 for (packet=0; packet < GNUNET_STREAM_ACK_BITMAP_BIT_LENGTH; packet++)
3479 if (NULL == ioh->messages[packet]) break;
3480 GNUNET_free (ioh->messages[packet]);
3483 GNUNET_free (socket->write_handle);
3484 socket->write_handle = NULL;
3489 * Cancel pending read operation.
3491 * @param ioh handle to operation to cancel
3494 GNUNET_STREAM_io_read_cancel (struct GNUNET_STREAM_IOReadHandle *ioh)
3496 struct GNUNET_STREAM_Socket *socket;
3498 socket = ioh->socket;
3499 GNUNET_assert (NULL != socket->read_handle);
3500 GNUNET_assert (ioh == socket->read_handle);
3501 /* Read io time task should be there; if it is already executed then this
3502 read handle is not valid */
3503 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != socket->read_io_timeout_task_id);
3504 GNUNET_SCHEDULER_cancel (socket->read_io_timeout_task_id);
3505 socket->read_io_timeout_task_id = GNUNET_SCHEDULER_NO_TASK;
3506 /* reading task may be present; if so we have to stop it */
3507 if (GNUNET_SCHEDULER_NO_TASK != socket->read_task_id)
3509 GNUNET_SCHEDULER_cancel (socket->read_task_id);
3510 socket->read_task_id = GNUNET_SCHEDULER_NO_TASK;
3513 socket->read_handle = NULL;
3516 /* end of stream_api.c */