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- /*
- This file is part of GNUnet.
- Copyright (C) 2001 - 2011 GNUnet e.V.
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- or (at your option) any later version.
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Affero General Public License for more details.
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @author Bartlomiej Polot
- * @file cadet/cadet.h
- */
- #ifndef CADET_H_
- #define CADET_H_
- #ifdef __cplusplus
- extern "C" {
- #if 0 /* keep Emacsens' auto-indent happy */
- }
- #endif
- #endif
- #include <stdint.h>
- #if ! defined(GNUNET_CULL_LOGGING)
- #define CADET_TIMING_START \
- struct GNUNET_TIME_Absolute __timestamp; \
- __timestamp = GNUNET_TIME_absolute_get ()
- #define CADET_TIMING_END \
- struct GNUNET_TIME_Relative __duration; \
- __duration = GNUNET_TIME_absolute_get_duration (__timestamp); \
- LOG (GNUNET_ERROR_TYPE_INFO, \
- " %s duration %s\n", \
- __FUNCTION__, \
- GNUNET_STRINGS_relative_time_to_string (__duration, GNUNET_YES));
- #else
- #define CADET_TIMING_START
- #define CADET_TIMING_END
- #endif
- #include "platform.h"
- #include "gnunet_util_lib.h"
- #include "gnunet_peer_lib.h"
- #include "gnunet_core_service.h"
- #include "gnunet_cadet_service.h"
- #include "gnunet_protocols.h"
- #include "gnunet_cadet_service.h"
- /******************************************************************************/
- /************************** CONSTANTS ******************************/
- /******************************************************************************/
- /**
- * Minimum value for channel IDs of local clients.
- */
- #define GNUNET_CADET_LOCAL_CHANNEL_ID_CLI 0x80000000U
- /**
- * FIXME.
- */
- #define HIGH_PID 0xFF000000
- /**
- * FIXME.
- */
- #define LOW_PID 0x00FFFFFF
- /**
- * Test if the two PIDs (of type `uint32_t`) are in the range where we
- * have to worry about overflows. This is the case when @a pid is
- * large and @a max is small, useful when comparing @a pid smaller
- * than @a max.
- */
- #define PID_OVERFLOW(pid, max) (((pid) > HIGH_PID) && ((max) < LOW_PID))
- /******************************************************************************/
- /************************** MESSAGES ******************************/
- /******************************************************************************/
- GNUNET_NETWORK_STRUCT_BEGIN
- /**
- * Number uniquely identifying a channel of a client.
- */
- struct GNUNET_CADET_ClientChannelNumber
- {
- /**
- * Values for channel numbering.
- * Local channel numbers given by the service (incoming) are
- * smaller than #GNUNET_CADET_LOCAL_CHANNEL_ID_CLI.
- * Local channel numbers given by the client (created) are
- * larger than #GNUNET_CADET_LOCAL_CHANNEL_ID_CLI.
- */
- uint32_t channel_of_client GNUNET_PACKED;
- };
- /**
- * Opaque handle to a channel.
- */
- struct GNUNET_CADET_Channel
- {
- /**
- * Other end of the channel.
- */
- struct GNUNET_PeerIdentity peer;
- /**
- * Handle to the cadet this channel belongs to
- */
- struct GNUNET_CADET_Handle *cadet;
- /**
- * Channel's port, if incoming.
- */
- struct GNUNET_CADET_Port *incoming_port;
- /**
- * Any data the caller wants to put in here, used for the
- * various callbacks (@e disconnects, @e window_changes, handlers).
- */
- void *ctx;
- /**
- * Message Queue for the channel (which we are implementing).
- */
- struct GNUNET_MQ_Handle *mq;
- /**
- * Task to allow mq to send more traffic.
- */
- struct GNUNET_SCHEDULER_Task *mq_cont;
- /**
- * Pending envelope with a message to be transmitted to the
- * service as soon as we are allowed to. Should only be
- * non-NULL if @e allow_send is 0.
- */
- struct GNUNET_MQ_Envelope *pending_env;
- /**
- * Window change handler.
- */
- GNUNET_CADET_WindowSizeEventHandler window_changes;
- /**
- * Disconnect handler.
- */
- GNUNET_CADET_DisconnectEventHandler disconnects;
- /**
- * Local ID of the channel, #GNUNET_CADET_LOCAL_CHANNEL_ID_CLI bit is set if outbound.
- */
- struct GNUNET_CADET_ClientChannelNumber ccn;
- /**
- * How many messages are we allowed to send to the service right now?
- */
- unsigned int allow_send;
- };
- /**
- * Message for a client to create and destroy channels.
- */
- struct GNUNET_CADET_PortMessage
- {
- /**
- * Type: #GNUNET_MESSAGE_TYPE_CADET_LOCAL_PORT_OPEN
- * or #GNUNET_MESSAGE_TYPE_CADET_LOCAL_PORT_CLOSE
- *
- * Size: sizeof(struct GNUNET_CADET_ChannelMessage)
- */
- struct GNUNET_MessageHeader header;
- /**
- * Port to open/close.
- */
- struct GNUNET_HashCode port GNUNET_PACKED;
- };
- /**
- * Message for a client to create channels.
- */
- struct GNUNET_CADET_LocalChannelCreateMessage
- {
- /**
- * Type: #GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_CREATE
- *
- * Size: sizeof(struct GNUNET_CADET_ChannelOpenMessageMessage)
- */
- struct GNUNET_MessageHeader header;
- /**
- * ID of a channel controlled by this client.
- */
- struct GNUNET_CADET_ClientChannelNumber ccn;
- /**
- * Channel's peer
- */
- struct GNUNET_PeerIdentity peer;
- /**
- * Port of the channel.
- */
- struct GNUNET_HashCode port;
- /**
- * Options.
- */
- uint32_t opt GNUNET_PACKED;
- };
- /**
- * Message for or to a client to destroy tunnel.
- */
- struct GNUNET_CADET_LocalChannelDestroyMessage
- {
- /**
- * Type: #GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_DESTROY
- */
- struct GNUNET_MessageHeader header;
- /**
- * ID of a channel controlled by this client.
- */
- struct GNUNET_CADET_ClientChannelNumber ccn;
- };
- /**
- * Message for cadet data traffic.
- */
- struct GNUNET_CADET_LocalData
- {
- /**
- * Type: #GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA
- */
- struct GNUNET_MessageHeader header;
- /**
- * ID of the channel
- */
- struct GNUNET_CADET_ClientChannelNumber ccn;
- /**
- * Priority and preferences (an enum GNUNET_MQ_PriorityPreferences)
- * of the message in NBO.
- */
- uint32_t pp GNUNET_PACKED;
- /**
- * Payload follows
- */
- };
- /**
- * Message to allow the client send more data to the service
- * (always service -> client).
- */
- struct GNUNET_CADET_LocalAck
- {
- /**
- * Type: #GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK
- */
- struct GNUNET_MessageHeader header;
- /**
- * ID of the channel allowed to send more data.
- */
- struct GNUNET_CADET_ClientChannelNumber ccn;
- };
- /**
- * Message to inform the client about channels in the service.
- *
- * TODO: split into two messages!
- */
- struct GNUNET_CADET_LocalInfo
- {
- /**
- * Type: #GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNEL or
- * #GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEER
- */
- struct GNUNET_MessageHeader header;
- /**
- * ID of the channel allowed to send more data.
- */
- struct GNUNET_CADET_ClientChannelNumber ccn;
- /**
- * ID of the destination of the channel (can be local peer).
- */
- struct GNUNET_PeerIdentity peer;
- };
- /**
- * Message to drop another message of specific type. Used in test context
- */
- struct GNUNET_CADET_RequestDropCadetMessage
- {
- /**
- * Type: #GNUNET_MESSAGE_TYPE_CADET_DROP_CADET_MESSAGE
- */
- struct GNUNET_MessageHeader header;
- /**
- * Type of the message this handler covers, in host byte order.
- */
- uint16_t type;
- /**
- * ID of the channel we want to drop a message for.
- */
- struct GNUNET_CADET_ClientChannelNumber ccn;
- };
- /**
- * Message to inform the client about channels in the service.
- */
- struct GNUNET_CADET_RequestPathInfoMessage
- {
- /**
- * Type: #GNUNET_MESSAGE_TYPE_CADET_LOCAL_REQUEST_INFO_PATH
- */
- struct GNUNET_MessageHeader header;
- /**
- * Always zero.
- */
- uint32_t resered GNUNET_PACKED;
- /**
- * ID of the destination of the channel (can be local peer).
- */
- struct GNUNET_PeerIdentity peer;
- };
- /**
- * Message to inform the client about channels in the service.
- */
- struct GNUNET_CADET_ChannelInfoMessage
- {
- /**
- * Type: #GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_CHANNEL.
- */
- struct GNUNET_MessageHeader header;
- /**
- * Root of the channel
- */
- struct GNUNET_PeerIdentity root;
- /**
- * Destination of the channel
- */
- struct GNUNET_PeerIdentity dest;
- /* FIXME: expand! */
- };
- /**
- * Message to as the service about information on a channel.
- */
- struct GNUNET_CADET_RequestChannelInfoMessage
- {
- /**
- * Type: #GNUNET_MESSAGE_TYPE_CADET_LOCAL_REQUEST_INFO_CHANNEL.
- */
- struct GNUNET_MessageHeader header;
- /**
- * Target of the channel.
- */
- struct GNUNET_PeerIdentity target;
- };
- /**
- * Message to inform the client about one of the paths known to the service.
- */
- struct GNUNET_CADET_LocalInfoPath
- {
- /**
- * Type: #GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PATH.
- */
- struct GNUNET_MessageHeader header;
- /**
- * Offset of the peer that was requested.
- */
- uint32_t off GNUNET_PACKED;
- };
- /**
- * Message to inform the client about one of the peers in the service.
- */
- struct GNUNET_CADET_LocalInfoPeers
- {
- /**
- * Type: #GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS
- */
- struct GNUNET_MessageHeader header;
- /**
- * Number of paths.
- */
- uint16_t paths GNUNET_PACKED;
- /**
- * Do we have a tunnel toward this peer?
- */
- int16_t tunnel GNUNET_PACKED;
- /**
- * Shortest known path.
- */
- uint32_t best_path_length GNUNET_PACKED;
- /**
- * ID of the peer (can be local peer).
- */
- struct GNUNET_PeerIdentity destination;
- };
- /**
- * Message to inform the client about one of the tunnels in the service.
- *
- * TODO: split into two messages!
- */
- struct GNUNET_CADET_LocalInfoTunnel
- {
- /**
- * Type: #GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNEL
- * or #GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS
- */
- struct GNUNET_MessageHeader header;
- /**
- * Number of channels.
- */
- uint32_t channels GNUNET_PACKED;
- /**
- * ID of the destination of the tunnel (can be local peer).
- */
- struct GNUNET_PeerIdentity destination;
- /**
- * Number of connections.
- */
- uint32_t connections GNUNET_PACKED;
- /**
- * Encryption state.
- */
- uint16_t estate GNUNET_PACKED;
- /**
- * Connection state.
- */
- uint16_t cstate GNUNET_PACKED;
- /* If TUNNEL (no 'S'): struct GNUNET_CADET_ConnectionTunnelIdentifier connection_ids[connections] */
- /* If TUNNEL (no 'S'): uint32_t channel_ids[channels] */
- };
- GNUNET_NETWORK_STRUCT_END
- /**
- * @brief Translate a fwd variable into a string representation, for logging.
- *
- * @param fwd Is FWD? (#GNUNET_YES or #GNUNET_NO)
- *
- * @return String representing FWD or BCK.
- */
- char *
- GC_f2s (int fwd);
- /**
- * Check if one pid is bigger than other, accounting for overflow.
- *
- * @param bigger Argument that should be bigger.
- * @param smaller Argument that should be smaller.
- *
- * @return True if bigger (arg1) has a higher value than smaller (arg 2).
- */
- int
- GC_is_pid_bigger (uint32_t bigger, uint32_t smaller);
- /**
- * Get the higher ACK value out of two values, taking in account overflow.
- *
- * @param a First ACK value.
- * @param b Second ACK value.
- *
- * @return Highest ACK value from the two.
- */
- uint32_t
- GC_max_pid (uint32_t a, uint32_t b);
- /**
- * Get the lower ACK value out of two values, taking in account overflow.
- *
- * @param a First ACK value.
- * @param b Second ACK value.
- *
- * @return Lowest ACK value from the two.
- */
- uint32_t
- GC_min_pid (uint32_t a, uint32_t b);
- /**
- * Allocate a string with a hexdump of any binary data.
- *
- * @param bin Arbitrary binary data.
- * @param len Length of @a bin in bytes.
- * @param output Where to write the output (if *output be NULL it's allocated).
- *
- * @return The size of the output.
- */
- size_t
- GC_bin2s (void *bin, unsigned int len, char **output);
- /**
- * Convert a message type into a string to help debug
- * Generated with:
- * FIND: "#define ([^ ]+)[ ]*([0-9]+)"
- * REPLACE: " case \2: return "\1"; break;"
- *
- * @param m Message type.
- *
- * @return Human readable string description.
- */
- const char *
- GC_m2s (uint16_t m);
- #if 0 /* keep Emacsens' auto-indent happy */
- {
- #endif
- #ifdef __cplusplus
- }
- #endif
- #endif
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