+++ /dev/null
-/*
- This file is part of GNUnet
- Copyright (C) 2002--2015 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
- */
-/**
- * @file transport/plugin_transport_xt.c
- * @brief Implementation of the TCP transport service
- * @author Christian Grothoff
- */
-#include "platform.h"
-#include "gnunet_hello_lib.h"
-#include "gnunet_constants.h"
-#include "gnunet_util_lib.h"
-#include "gnunet_nat_service.h"
-#include "gnunet_protocols.h"
-#include "gnunet_resolver_service.h"
-#include "gnunet_signatures.h"
-#include "gnunet_statistics_service.h"
-#include "gnunet_transport_service.h"
-#include "gnunet_transport_plugin.h"
-#include "transport.h"
-
-#define LOG(kind,...) GNUNET_log_from (kind, "transport-xt",__VA_ARGS__)
-
-#define PLUGIN_NAME "xt"
-
-/**
- * How long until we give up on establishing an NAT connection?
- * Must be > 4 RTT
- */
-#define NAT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
-
-/**
- * Opaque handle that can be used to cancel
- * a transmit-ready notification.
- */
-struct GNUNET_CONNECTION_TransmitHandle;
-
-/**
- * @brief handle for a server
- */
-struct GNUNET_SERVER_Handle;
-
-/**
- * @brief opaque handle for a client of the server
- */
-struct GNUNET_SERVER_Client;
-
-/**
- * @brief opaque handle server returns for aborting transmission to a client.
- */
-struct GNUNET_SERVER_TransmitHandle;
-
-/**
- * @brief handle for a network connection
- */
-struct GNUNET_CONNECTION_Handle;
-
-/**
- * @brief handle for a network service
- */
-struct LEGACY_SERVICE_Context;
-
-
-/**
- * Stops a service that was started with #GNUNET_SERVICE_start().
- *
- * @param srv service to stop
- */
-void
-LEGACY_SERVICE_stop (struct LEGACY_SERVICE_Context *srv);
-
-
-
-/**
- * Function called to notify a client about the connection begin ready
- * to queue more data. @a buf will be NULL and @a size zero if the
- * connection was closed for writing in the meantime.
- *
- * @param cls closure
- * @param size number of bytes available in @a buf
- * @param buf where the callee should write the message
- * @return number of bytes written to @a buf
- */
-typedef size_t
-(*GNUNET_CONNECTION_TransmitReadyNotify) (void *cls,
- size_t size,
- void *buf);
-
-/**
- * Credentials for UNIX domain sockets.
- */
-struct GNUNET_CONNECTION_Credentials
-{
- /**
- * UID of the other end of the connection.
- */
- uid_t uid;
-
- /**
- * GID of the other end of the connection.
- */
- gid_t gid;
-};
-
-
-/**
- * Functions with this signature are called whenever a client
- * is disconnected on the network level.
- *
- * @param cls closure
- * @param client identification of the client; NULL
- * for the last call when the server is destroyed
- */
-typedef void
-(*GNUNET_SERVER_DisconnectCallback) (void *cls,
- struct GNUNET_SERVER_Client *client);
-
-
-/**
- * Functions with this signature are called whenever a client
- * is connected on the network level.
- *
- * @param cls closure
- * @param client identification of the client
- */
-typedef void
-(*GNUNET_SERVER_ConnectCallback) (void *cls,
- struct GNUNET_SERVER_Client *client);
-
-
-
-
-/**
- * Function to call for access control checks.
- *
- * @param cls closure
- * @param ucred credentials, if available, otherwise NULL
- * @param addr address
- * @param addrlen length of address
- * @return GNUNET_YES to allow, GNUNET_NO to deny, GNUNET_SYSERR
- * for unknown address family (will be denied).
- */
-typedef int
-(*GNUNET_CONNECTION_AccessCheck) (void *cls,
- const struct
- GNUNET_CONNECTION_Credentials *
- ucred,
- const struct sockaddr * addr,
- socklen_t addrlen);
-
-/**
- * Callback function for data received from the network. Note that
- * both "available" and "err" would be 0 if the read simply timed out.
- *
- * @param cls closure
- * @param buf pointer to received data
- * @param available number of bytes availabe in "buf",
- * possibly 0 (on errors)
- * @param addr address of the sender
- * @param addrlen size of addr
- * @param errCode value of errno (on errors receiving)
- */
-typedef void
-(*GNUNET_CONNECTION_Receiver) (void *cls, const void *buf,
- size_t available,
- const struct sockaddr * addr,
- socklen_t addrlen, int errCode);
-
-
-
-/**
- * Close the connection and free associated resources. There must
- * not be any pending requests for reading or writing to the
- * connection at this time.
- *
- * @param connection connection to destroy
- */
-void
-GNUNET_CONNECTION_destroy (struct GNUNET_CONNECTION_Handle *connection);
-
-
-/**
- * Signature of a function to create a custom tokenizer.
- *
- * @param cls closure from #GNUNET_SERVER_set_callbacks
- * @param client handle to client the tokenzier will be used for
- * @return handle to custom tokenizer ('mst')
- */
-typedef void*
-(*GNUNET_SERVER_MstCreateCallback) (void *cls,
- struct GNUNET_SERVER_Client *client);
-
-
-/**
- * Signature of a function to destroy a custom tokenizer.
- *
- * @param cls closure from #GNUNET_SERVER_set_callbacks
- * @param mst custom tokenizer handle
- */
-typedef void
-(*GNUNET_SERVER_MstDestroyCallback) (void *cls,
- void *mst);
-
-/**
- * Signature of a function to receive data for a custom tokenizer.
- *
- * @param cls closure from #GNUNET_SERVER_set_callbacks
- * @param mst custom tokenizer handle
- * @param client_identity ID of client for which this is a buffer,
- * can be NULL (will be passed back to 'cb')
- * @param buf input data to add
- * @param size number of bytes in @a buf
- * @param purge should any excess bytes in the buffer be discarded
- * (i.e. for packet-based services like UDP)
- * @param one_shot only call callback once, keep rest of message in buffer
- * @return #GNUNET_OK if we are done processing (need more data)
- * #GNUNET_NO if one_shot was set and we have another message ready
- * #GNUNET_SYSERR if the data stream is corrupt
- */
-typedef int
-(*GNUNET_SERVER_MstReceiveCallback) (void *cls, void *mst,
- struct GNUNET_SERVER_Client *client,
- const char *buf,
- size_t size,
- int purge,
- int one_shot);
-/**
- * Functions with this signature are called whenever a message is
- * received.
- *
- * @param cls closure
- * @param client identification of the client
- * @param message the actual message
- */
-typedef void
-(*GNUNET_SERVER_MessageCallback) (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message);
-
-/**
- * Message handler. Each struct specifies how to handle on particular
- * type of message received.
- */
-struct GNUNET_SERVER_MessageHandler
-{
- /**
- * Function to call for messages of "type".
- */
- GNUNET_SERVER_MessageCallback callback;
-
- /**
- * Closure argument for @e callback.
- */
- void *callback_cls;
-
- /**
- * Type of the message this handler covers.
- */
- uint16_t type;
-
- /**
- * Expected size of messages of this type. Use 0 for
- * variable-size. If non-zero, messages of the given
- * type will be discarded (and the connection closed)
- * if they do not have the right size.
- */
- uint16_t expected_size;
-
-};
-
-
-/**
- * Options for the service (bitmask).
- */
-enum LEGACY_SERVICE_Options
-{
- /**
- * Use defaults. Terminates all client connections and the listen
- * sockets immediately upon receiving the shutdown signal.
- */
- LEGACY_SERVICE_OPTION_NONE = 0,
-
- /**
- * Do not trigger server shutdown on signal at all; instead, allow
- * for the user to terminate the server explicitly when needed
- * by calling #LEGACY_SERVICE_shutdown().
- */
- LEGACY_SERVICE_OPTION_MANUAL_SHUTDOWN = 1,
-
- /**
- * Trigger a SOFT server shutdown on signals, allowing active
- * non-monitor clients to complete their transactions.
- */
- LEGACY_SERVICE_OPTION_SOFT_SHUTDOWN = 2
-};
-
-
-
-/**
- * Ask the server to disconnect from the given client. This is the
- * same as passing #GNUNET_SYSERR to #GNUNET_SERVER_receive_done,
- * except that it allows dropping of a client even when not handling a
- * message from that client.
- *
- * @param client the client to disconnect from
- */
-void
-GNUNET_SERVER_client_disconnect (struct GNUNET_SERVER_Client *client);
-
-/**
- * Return user context associated with the given client.
- * Note: you should probably use the macro (call without the underscore).
- *
- * @param client client to query
- * @param size number of bytes in user context struct (for verification only)
- * @return pointer to user context
- */
-void *
-GNUNET_SERVER_client_get_user_context_ (struct GNUNET_SERVER_Client *client,
- size_t size);
-
-
-/**
- * Functions with this signature are called whenever a
- * complete message is received by the tokenizer.
- *
- * Do not call #GNUNET_SERVER_mst_destroy from within
- * the scope of this callback.
- *
- * @param cls closure
- * @param client identification of the client
- * @param message the actual message
- * @return #GNUNET_OK on success, #GNUNET_SYSERR to stop further processing
- */
-typedef int
-(*GNUNET_SERVER_MessageTokenizerCallback) (void *cls,
- void *client,
- const struct GNUNET_MessageHeader *message);
-
-
-/**
- * Create a message stream tokenizer.
- *
- * @param cb function to call on completed messages
- * @param cb_cls closure for @a cb
- * @return handle to tokenizer
- */
-struct GNUNET_SERVER_MessageStreamTokenizer *
-GNUNET_SERVER_mst_create (GNUNET_SERVER_MessageTokenizerCallback cb,
- void *cb_cls);
-
-/**
- * Add incoming data to the receive buffer and call the
- * callback for all complete messages.
- *
- * @param mst tokenizer to use
- * @param client_identity ID of client for which this is a buffer,
- * can be NULL (will be passed back to 'cb')
- * @param buf input data to add
- * @param size number of bytes in @a buf
- * @param purge should any excess bytes in the buffer be discarded
- * (i.e. for packet-based services like UDP)
- * @param one_shot only call callback once, keep rest of message in buffer
- * @return #GNUNET_OK if we are done processing (need more data)
- * #GNUNET_NO if one_shot was set and we have another message ready
- * #GNUNET_SYSERR if the data stream is corrupt
- */
-int
-GNUNET_SERVER_mst_receive (struct GNUNET_SERVER_MessageStreamTokenizer *mst,
- void *client_identity,
- const char *buf, size_t size,
- int purge, int one_shot);
-
-
-
-/**
- * Destroys a tokenizer.
- *
- * @param mst tokenizer to destroy
- */
-void
-GNUNET_SERVER_mst_destroy (struct GNUNET_SERVER_MessageStreamTokenizer *mst);
-
-
-/**
- * Set user context to be associated with the given client.
- * Note: you should probably use the macro (call without the underscore).
- *
- * @param client client to query
- * @param ptr pointer to user context
- * @param size number of bytes in user context struct (for verification only)
- */
-void
-GNUNET_SERVER_client_set_user_context_ (struct GNUNET_SERVER_Client *client,
- void *ptr,
- size_t size);
-/**
- * Return user context associated with the given client.
- *
- * @param client client to query
- * @param type expected return type (i.e. 'struct Foo')
- * @return pointer to user context of type 'type *'.
- */
-#define GNUNET_SERVER_client_get_user_context(client,type) \
- (type *) GNUNET_SERVER_client_get_user_context_ (client, sizeof (type))
-
-/**
- * Set user context to be associated with the given client.
- *
- * @param client client to query
- * @param value pointer to user context
- */
-#define GNUNET_SERVER_client_set_user_context(client,value) \
- GNUNET_SERVER_client_set_user_context_ (client, value, sizeof (*value))
-
-
-
-/**
- * Notify us when the server has enough space to transmit
- * a message of the given size to the given client.
- *
- * @param client client to transmit message to
- * @param size requested amount of buffer space
- * @param timeout after how long should we give up (and call
- * notify with buf NULL and size 0)?
- * @param callback function to call when space is available
- * @param callback_cls closure for @a callback
- * @return non-NULL if the notify callback was queued; can be used
- * to cancel the request using
- * #GNUNET_SERVER_notify_transmit_ready_cancel.
- * NULL if we are already going to notify someone else (busy)
- */
-struct GNUNET_SERVER_TransmitHandle *
-GNUNET_SERVER_notify_transmit_ready (struct GNUNET_SERVER_Client *client,
- size_t size,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_CONNECTION_TransmitReadyNotify callback,
- void *callback_cls);
-
-/**
- * Abort transmission request.
- *
- * @param th request to abort
- */
-void
-GNUNET_SERVER_notify_transmit_ready_cancel (struct GNUNET_SERVER_TransmitHandle *th);
-
-
-
-
-/**
- * Notify the server that the given client handle should
- * be kept (keeps the connection up if possible, increments
- * the internal reference counter).
- *
- * @param client the client to keep
- */
-void
-GNUNET_SERVER_client_keep (struct GNUNET_SERVER_Client *client);
-
-
-/**
- * Notify the server that the given client handle is no
- * longer required. Decrements the reference counter. If
- * that counter reaches zero an inactive connection maybe
- * closed.
- *
- * @param client the client to drop
- */
-void
-GNUNET_SERVER_client_drop (struct GNUNET_SERVER_Client *client);
-
-
-/**
- * Function called by the service's run
- * method to run service-specific setup code.
- *
- * @param cls closure
- * @param server the initialized server
- * @param cfg configuration to use
- */
-typedef void
-(*LEGACY_SERVICE_Main) (void *cls,
- struct GNUNET_SERVER_Handle *server,
- const struct GNUNET_CONFIGURATION_Handle *cfg);
-
-
-
-/**
- * Suspend accepting connections from the listen socket temporarily.
- * Resume activity using #GNUNET_SERVER_resume.
- *
- * @param server server to stop accepting connections.
- */
-void
-GNUNET_SERVER_suspend (struct GNUNET_SERVER_Handle *server);
-
-/**
- * Notify us when the server has enough space to transmit
- * a message of the given size to the given client.
- *
- * @param client client to transmit message to
- * @param size requested amount of buffer space
- * @param timeout after how long should we give up (and call
- * notify with buf NULL and size 0)?
- * @param callback function to call when space is available
- * @param callback_cls closure for @a callback
- * @return non-NULL if the notify callback was queued; can be used
- * to cancel the request using
- * #GNUNET_SERVER_notify_transmit_ready_cancel.
- * NULL if we are already going to notify someone else (busy)
- */
-struct GNUNET_SERVER_TransmitHandle *
-GNUNET_SERVER_notify_transmit_ready (struct GNUNET_SERVER_Client *client,
- size_t size,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_CONNECTION_TransmitReadyNotify callback,
- void *callback_cls);
-
-
-/**
- * Add a TCP socket-based connection to the set of handles managed by
- * this server. Use this function for outgoing (P2P) connections that
- * we initiated (and where this server should process incoming
- * messages).
- *
- * @param server the server to use
- * @param connection the connection to manage (client must
- * stop using this connection from now on)
- * @return the client handle
- */
-struct GNUNET_SERVER_Client *
-GNUNET_SERVER_connect_socket (struct GNUNET_SERVER_Handle *server,
- struct GNUNET_CONNECTION_Handle *connection);
-
-
-/**
- * Resume accepting connections from the listen socket.
- *
- * @param server server to resume accepting connections.
- */
-void
-GNUNET_SERVER_resume (struct GNUNET_SERVER_Handle *server);
-
-/**
- * Free resources held by this server.
- *
- * @param server server to destroy
- */
-void
-GNUNET_SERVER_destroy (struct GNUNET_SERVER_Handle *server);
-
-
-
-
-#include "tcp_connection_legacy.c"
-#include "tcp_server_mst_legacy.c"
-#include "tcp_server_legacy.c"
-#include "tcp_service_legacy.c"
-
-GNUNET_NETWORK_STRUCT_BEGIN
-
-/**
- * Initial handshake message for a session.
- */
-struct WelcomeMessage
-{
- /**
- * Type is #GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME.
- */
- struct GNUNET_MessageHeader header;
-
- /**
- * Identity of the node connecting (TCP client)
- */
- struct GNUNET_PeerIdentity clientIdentity;
-
-};
-
-/**
- * Basically a WELCOME message, but with the purpose
- * of giving the waiting peer a client handle to use
- */
-struct TCP_NAT_ProbeMessage
-{
- /**
- * Type is #GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE.
- */
- struct GNUNET_MessageHeader header;
-
- /**
- * Identity of the sender of the message.
- */
- struct GNUNET_PeerIdentity clientIdentity;
-
-};
-GNUNET_NETWORK_STRUCT_END
-
-/**
- * Context for sending a NAT probe via TCP.
- */
-struct TCPProbeContext
-{
-
- /**
- * Active probes are kept in a DLL.
- */
- struct TCPProbeContext *next;
-
- /**
- * Active probes are kept in a DLL.
- */
- struct TCPProbeContext *prev;
-
- /**
- * Probe connection.
- */
- struct GNUNET_CONNECTION_Handle *sock;
-
- /**
- * Message to be sent.
- */
- struct TCP_NAT_ProbeMessage message;
-
- /**
- * Handle to the transmission.
- */
- struct GNUNET_CONNECTION_TransmitHandle *transmit_handle;
-
- /**
- * Transport plugin handle.
- */
- struct Plugin *plugin;
-};
-
-/**
- * Bits in the `options` field of TCP addresses.
- */
-enum TcpAddressOptions
-{
-
- /**
- * No bits set.
- */
- TCP_OPTIONS_NONE = 0,
-
- /**
- * See #HTTP_OPTIONS_VERIFY_CERTIFICATE.
- */
- TCP_OPTIONS_RESERVED = 1,
-
- /**
- * Enable TCP Stealth-style port knocking.
- */
- TCP_OPTIONS_TCP_STEALTH = 2
-};
-
-GNUNET_NETWORK_STRUCT_BEGIN
-
-/**
- * Network format for IPv4 addresses.
- */
-struct IPv4TcpAddress
-{
- /**
- * Optional options and flags for this address,
- * see `enum TcpAddressOptions`
- */
- uint32_t options GNUNET_PACKED;
-
- /**
- * IPv4 address, in network byte order.
- */
- uint32_t ipv4_addr GNUNET_PACKED;
-
- /**
- * Port number, in network byte order.
- */
- uint16_t t4_port GNUNET_PACKED;
-
-};
-
-/**
- * Network format for IPv6 addresses.
- */
-struct IPv6TcpAddress
-{
- /**
- * Optional flags for this address
- * see `enum TcpAddressOptions`
- */
- uint32_t options GNUNET_PACKED;
-
- /**
- * IPv6 address.
- */
- struct in6_addr ipv6_addr GNUNET_PACKED;
-
- /**
- * Port number, in network byte order.
- */
- uint16_t t6_port GNUNET_PACKED;
-
-};
-GNUNET_NETWORK_STRUCT_END
-
-/**
- * Encapsulation of all of the state of the plugin.
- */
-struct Plugin;
-
-/**
- * Information kept for each message that is yet to
- * be transmitted.
- */
-struct PendingMessage
-{
-
- /**
- * This is a doubly-linked list.
- */
- struct PendingMessage *next;
-
- /**
- * This is a doubly-linked list.
- */
- struct PendingMessage *prev;
-
- /**
- * The pending message
- */
- const char *msg;
-
- /**
- * Continuation function to call once the message
- * has been sent. Can be NULL if there is no
- * continuation to call.
- */
- GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
-
- /**
- * Closure for @e transmit_cont.
- */
- void *transmit_cont_cls;
-
- /**
- * Timeout value for the pending message.
- */
- struct GNUNET_TIME_Absolute timeout;
-
- /**
- * So that the gnunet-service-transport can group messages together,
- * these pending messages need to accept a message buffer and size
- * instead of just a `struct GNUNET_MessageHeader`.
- */
- size_t message_size;
-
-};
-
-/**
- * Session handle for TCP connections.
- */
-struct GNUNET_ATS_Session
-{
- /**
- * To whom are we talking to (set to our identity
- * if we are still waiting for the welcome message)
- */
- struct GNUNET_PeerIdentity target;
-
- /**
- * Pointer to the global plugin struct.
- */
- struct Plugin *plugin;
-
- /**
- * The client (used to identify this connection)
- */
- struct GNUNET_SERVER_Client *client;
-
- /**
- * Task cleaning up a NAT client connection establishment attempt;
- */
- struct GNUNET_SCHEDULER_Task *nat_connection_timeout;
-
- /**
- * Messages currently pending for transmission
- * to this peer, if any.
- */
- struct PendingMessage *pending_messages_head;
-
- /**
- * Messages currently pending for transmission
- * to this peer, if any.
- */
- struct PendingMessage *pending_messages_tail;
-
- /**
- * Handle for pending transmission request.
- */
- struct GNUNET_SERVER_TransmitHandle *transmit_handle;
-
- /**
- * Address of the other peer.
- */
- struct GNUNET_HELLO_Address *address;
-
- /**
- * ID of task used to delay receiving more to throttle sender.
- */
- struct GNUNET_SCHEDULER_Task *receive_delay_task;
-
- /**
- * Session timeout task
- */
- struct GNUNET_SCHEDULER_Task *timeout_task;
-
- /**
- * When will this session time out?
- */
- struct GNUNET_TIME_Absolute timeout;
-
- /**
- * When will we continue to read from the socket?
- * (used to enforce inbound quota).
- */
- struct GNUNET_TIME_Absolute receive_delay;
-
- /**
- * Last activity on this connection. Used to select preferred
- * connection.
- */
- struct GNUNET_TIME_Absolute last_activity;
-
- /**
- * Number of bytes waiting for transmission to this peer.
- */
- unsigned long long bytes_in_queue;
-
- /**
- * Number of messages waiting for transmission to this peer.
- */
- unsigned int msgs_in_queue;
-
- /**
- * Network type of the address.
- */
- enum GNUNET_NetworkType scope;
-
- /**
- * Are we still expecting the welcome message? (#GNUNET_YES/#GNUNET_NO)
- */
- int expecting_welcome;
-
- /**
- * Was this session created using NAT traversal?
- */
- int is_nat;
-
-};
-
-
-/**
- * Context for address to string conversion, closure
- * for #append_port().
- */
-struct PrettyPrinterContext
-{
- /**
- * DLL
- */
- struct PrettyPrinterContext *next;
-
- /**
- * DLL
- */
- struct PrettyPrinterContext *prev;
-
- /**
- * Our plugin.
- */
- struct Plugin *plugin;
-
- /**
- * Timeout task
- */
- struct GNUNET_SCHEDULER_Task *timeout_task;
-
- /**
- * Resolver handle
- */
- struct GNUNET_RESOLVER_RequestHandle *resolver_handle;
-
- /**
- * Function to call with the result.
- */
- GNUNET_TRANSPORT_AddressStringCallback asc;
-
- /**
- * Clsoure for @e asc.
- */
- void *asc_cls;
-
- /**
- * IPv6 address
- */
- int ipv6;
-
- /**
- * Options
- */
- uint32_t options;
-
- /**
- * Port to add after the IP address.
- */
- uint16_t port;
-};
-
-
-/**
- * Encapsulation of all of the state of the plugin.
- */
-struct Plugin
-{
- /**
- * Our environment.
- */
- struct GNUNET_TRANSPORT_PluginEnvironment *env;
-
- /**
- * The listen socket.
- */
- struct GNUNET_CONNECTION_Handle *lsock;
-
- /**
- * Our handle to the NAT module.
- */
- struct GNUNET_NAT_Handle *nat;
-
- /**
- * Map from peer identities to sessions for the given peer.
- */
- struct GNUNET_CONTAINER_MultiPeerMap *sessionmap;
-
- /**
- * Handle to the network service.
- */
- struct LEGACY_SERVICE_Context *service;
-
- /**
- * Handle to the server for this service.
- */
- struct GNUNET_SERVER_Handle *server;
-
- /**
- * Copy of the handler array where the closures are
- * set to this struct's instance.
- */
- struct GNUNET_SERVER_MessageHandler *handlers;
-
- /**
- * Map of peers we have tried to contact behind a NAT
- */
- struct GNUNET_CONTAINER_MultiPeerMap *nat_wait_conns;
-
- /**
- * List of active TCP probes.
- */
- struct TCPProbeContext *probe_head;
-
- /**
- * List of active TCP probes.
- */
- struct TCPProbeContext *probe_tail;
-
- /**
- * Function to call about session status changes.
- */
- GNUNET_TRANSPORT_SessionInfoCallback sic;
-
- /**
- * Closure for @e sic.
- */
- void *sic_cls;
-
- /**
- * ID of task used to update our addresses when one expires.
- */
- struct GNUNET_SCHEDULER_Task *address_update_task;
-
- /**
- * Running pretty printers: head
- */
- struct PrettyPrinterContext *ppc_dll_head;
-
- /**
- * Running pretty printers: tail
- */
- struct PrettyPrinterContext *ppc_dll_tail;
-
- /**
- * Welcome message used by this peer.
- */
- struct WelcomeMessage my_welcome;
-
- /**
- * How many more TCP sessions are we allowed to open right now?
- */
- unsigned long long max_connections;
-
- /**
- * How many more TCP sessions do we have right now?
- */
- unsigned long long cur_connections;
-
- /**
- * Address options
- */
- uint32_t myoptions;
-
- /**
- * Port that we are actually listening on.
- */
- uint16_t open_port;
-
- /**
- * Port that the user said we would have visible to the
- * rest of the world.
- */
- uint16_t adv_port;
-
-};
-
-
-/**
- * Get the list of addresses that a server for the given service
- * should bind to.
- *
- * @param service_name name of the service
- * @param cfg configuration (which specifies the addresses)
- * @param addrs set (call by reference) to an array of pointers to the
- * addresses the server should bind to and listen on; the
- * array will be NULL-terminated (on success)
- * @param addr_lens set (call by reference) to an array of the lengths
- * of the respective `struct sockaddr` struct in the @a addrs
- * array (on success)
- * @return number of addresses found on success,
- * #GNUNET_SYSERR if the configuration
- * did not specify reasonable finding information or
- * if it specified a hostname that could not be resolved;
- * #GNUNET_NO if the number of addresses configured is
- * zero (in this case, `*addrs` and `*addr_lens` will be
- * set to NULL).
- */
-static int
-get_server_addresses (const char *service_name,
- const struct GNUNET_CONFIGURATION_Handle *cfg,
- struct sockaddr ***addrs,
- socklen_t ** addr_lens)
-{
- int disablev6;
- struct GNUNET_NETWORK_Handle *desc;
- unsigned long long port;
- char *unixpath;
- struct addrinfo hints;
- struct addrinfo *res;
- struct addrinfo *pos;
- struct addrinfo *next;
- unsigned int i;
- int resi;
- int ret;
- int abstract;
- struct sockaddr **saddrs;
- socklen_t *saddrlens;
- char *hostname;
-
- *addrs = NULL;
- *addr_lens = NULL;
- desc = NULL;
- if (GNUNET_CONFIGURATION_have_value (cfg, service_name, "DISABLEV6"))
- {
- if (GNUNET_SYSERR ==
- (disablev6 =
- GNUNET_CONFIGURATION_get_value_yesno (cfg, service_name, "DISABLEV6")))
- return GNUNET_SYSERR;
- }
- else
- disablev6 = GNUNET_NO;
-
- if (! disablev6)
- {
- /* probe IPv6 support */
- desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_STREAM, 0);
- if (NULL == desc)
- {
- if ((ENOBUFS == errno) || (ENOMEM == errno) || (ENFILE == errno) ||
- (EACCES == errno))
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
- return GNUNET_SYSERR;
- }
- LOG (GNUNET_ERROR_TYPE_INFO,
- _("Disabling IPv6 support for service `%s', failed to create IPv6 socket: %s\n"),
- service_name, STRERROR (errno));
- disablev6 = GNUNET_YES;
- }
- else
- {
- GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (desc));
- desc = NULL;
- }
- }
-
- port = 0;
- if (GNUNET_CONFIGURATION_have_value (cfg, service_name, "PORT"))
- {
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (cfg, service_name,
- "PORT", &port))
- {
- LOG (GNUNET_ERROR_TYPE_ERROR,
- _("Require valid port number for service `%s' in configuration!\n"),
- service_name);
- }
- if (port > 65535)
- {
- LOG (GNUNET_ERROR_TYPE_ERROR,
- _("Require valid port number for service `%s' in configuration!\n"),
- service_name);
- return GNUNET_SYSERR;
- }
- }
-
- if (GNUNET_CONFIGURATION_have_value (cfg, service_name, "BINDTO"))
- {
- GNUNET_break (GNUNET_OK ==
- GNUNET_CONFIGURATION_get_value_string (cfg, service_name,
- "BINDTO", &hostname));
- }
- else
- hostname = NULL;
-
- unixpath = NULL;
- abstract = GNUNET_NO;
-#ifdef AF_UNIX
- if ((GNUNET_YES ==
- GNUNET_CONFIGURATION_have_value (cfg, service_name, "UNIXPATH")) &&
- (GNUNET_OK ==
- GNUNET_CONFIGURATION_get_value_filename (cfg, service_name, "UNIXPATH",
- &unixpath)) &&
- (0 < strlen (unixpath)))
- {
- /* probe UNIX support */
- struct sockaddr_un s_un;
-
- if (strlen (unixpath) >= sizeof (s_un.sun_path))
- {
- LOG (GNUNET_ERROR_TYPE_WARNING,
- _("UNIXPATH `%s' too long, maximum length is %llu\n"), unixpath,
- (unsigned long long) sizeof (s_un.sun_path));
- unixpath = GNUNET_NETWORK_shorten_unixpath (unixpath);
- LOG (GNUNET_ERROR_TYPE_INFO,
- _("Using `%s' instead\n"),
- unixpath);
- }
-#ifdef LINUX
- abstract = GNUNET_CONFIGURATION_get_value_yesno (cfg,
- "TESTING",
- "USE_ABSTRACT_SOCKETS");
- if (GNUNET_SYSERR == abstract)
- abstract = GNUNET_NO;
-#endif
- if ((GNUNET_YES != abstract)
- && (GNUNET_OK !=
- GNUNET_DISK_directory_create_for_file (unixpath)))
- GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
- "mkdir",
- unixpath);
- }
- if (NULL != unixpath)
- {
- desc = GNUNET_NETWORK_socket_create (AF_UNIX, SOCK_STREAM, 0);
- if (NULL == desc)
- {
- if ((ENOBUFS == errno) || (ENOMEM == errno) || (ENFILE == errno) ||
- (EACCES == errno))
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
- GNUNET_free_non_null (hostname);
- GNUNET_free (unixpath);
- return GNUNET_SYSERR;
- }
- LOG (GNUNET_ERROR_TYPE_INFO,
- _("Disabling UNIX domain socket support for service `%s', failed to create UNIX domain socket: %s\n"),
- service_name,
- STRERROR (errno));
- GNUNET_free (unixpath);
- unixpath = NULL;
- }
- else
- {
- GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (desc));
- desc = NULL;
- }
- }
-#endif
-
- if ((0 == port) && (NULL == unixpath))
- {
- LOG (GNUNET_ERROR_TYPE_ERROR,
- _("Have neither PORT nor UNIXPATH for service `%s', but one is required\n"),
- service_name);
- GNUNET_free_non_null (hostname);
- return GNUNET_SYSERR;
- }
- if (0 == port)
- {
- saddrs = GNUNET_malloc (2 * sizeof (struct sockaddr *));
- saddrlens = GNUNET_malloc (2 * sizeof (socklen_t));
- add_unixpath (saddrs, saddrlens, unixpath, abstract);
- GNUNET_free_non_null (unixpath);
- GNUNET_free_non_null (hostname);
- *addrs = saddrs;
- *addr_lens = saddrlens;
- return 1;
- }
-
- if (NULL != hostname)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Resolving `%s' since that is where `%s' will bind to.\n",
- hostname,
- service_name);
- memset (&hints, 0, sizeof (struct addrinfo));
- if (disablev6)
- hints.ai_family = AF_INET;
- hints.ai_protocol = IPPROTO_TCP;
- if ((0 != (ret = getaddrinfo (hostname, NULL, &hints, &res))) ||
- (NULL == res))
- {
- LOG (GNUNET_ERROR_TYPE_ERROR,
- _("Failed to resolve `%s': %s\n"),
- hostname,
- gai_strerror (ret));
- GNUNET_free (hostname);
- GNUNET_free_non_null (unixpath);
- return GNUNET_SYSERR;
- }
- next = res;
- i = 0;
- while (NULL != (pos = next))
- {
- next = pos->ai_next;
- if ((disablev6) && (pos->ai_family == AF_INET6))
- continue;
- i++;
- }
- if (0 == i)
- {
- LOG (GNUNET_ERROR_TYPE_ERROR,
- _("Failed to find %saddress for `%s'.\n"),
- disablev6 ? "IPv4 " : "",
- hostname);
- freeaddrinfo (res);
- GNUNET_free (hostname);
- GNUNET_free_non_null (unixpath);
- return GNUNET_SYSERR;
- }
- resi = i;
- if (NULL != unixpath)
- resi++;
- saddrs = GNUNET_malloc ((resi + 1) * sizeof (struct sockaddr *));
- saddrlens = GNUNET_malloc ((resi + 1) * sizeof (socklen_t));
- i = 0;
- if (NULL != unixpath)
- {
- add_unixpath (saddrs, saddrlens, unixpath, abstract);
- i++;
- }
- next = res;
- while (NULL != (pos = next))
- {
- next = pos->ai_next;
- if ((disablev6) && (AF_INET6 == pos->ai_family))
- continue;
- if ((IPPROTO_TCP != pos->ai_protocol) && (0 != pos->ai_protocol))
- continue; /* not TCP */
- if ((SOCK_STREAM != pos->ai_socktype) && (0 != pos->ai_socktype))
- continue; /* huh? */
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Service `%s' will bind to `%s'\n",
- service_name, GNUNET_a2s (pos->ai_addr, pos->ai_addrlen));
- if (AF_INET == pos->ai_family)
- {
- GNUNET_assert (sizeof (struct sockaddr_in) == pos->ai_addrlen);
- saddrlens[i] = pos->ai_addrlen;
- saddrs[i] = GNUNET_malloc (saddrlens[i]);
- GNUNET_memcpy (saddrs[i], pos->ai_addr, saddrlens[i]);
- ((struct sockaddr_in *) saddrs[i])->sin_port = htons (port);
- }
- else
- {
- GNUNET_assert (AF_INET6 == pos->ai_family);
- GNUNET_assert (sizeof (struct sockaddr_in6) == pos->ai_addrlen);
- saddrlens[i] = pos->ai_addrlen;
- saddrs[i] = GNUNET_malloc (saddrlens[i]);
- GNUNET_memcpy (saddrs[i], pos->ai_addr, saddrlens[i]);
- ((struct sockaddr_in6 *) saddrs[i])->sin6_port = htons (port);
- }
- i++;
- }
- GNUNET_free (hostname);
- freeaddrinfo (res);
- resi = i;
- }
- else
- {
- /* will bind against everything, just set port */
- if (disablev6)
- {
- /* V4-only */
- resi = 1;
- if (NULL != unixpath)
- resi++;
- i = 0;
- saddrs = GNUNET_malloc ((resi + 1) * sizeof (struct sockaddr *));
- saddrlens = GNUNET_malloc ((resi + 1) * sizeof (socklen_t));
- if (NULL != unixpath)
- {
- add_unixpath (saddrs, saddrlens, unixpath, abstract);
- i++;
- }
- saddrlens[i] = sizeof (struct sockaddr_in);
- saddrs[i] = GNUNET_malloc (saddrlens[i]);
-#if HAVE_SOCKADDR_IN_SIN_LEN
- ((struct sockaddr_in *) saddrs[i])->sin_len = saddrlens[i];
-#endif
- ((struct sockaddr_in *) saddrs[i])->sin_family = AF_INET;
- ((struct sockaddr_in *) saddrs[i])->sin_port = htons (port);
- }
- else
- {
- /* dual stack */
- resi = 2;
- if (NULL != unixpath)
- resi++;
- saddrs = GNUNET_malloc ((resi + 1) * sizeof (struct sockaddr *));
- saddrlens = GNUNET_malloc ((resi + 1) * sizeof (socklen_t));
- i = 0;
- if (NULL != unixpath)
- {
- add_unixpath (saddrs, saddrlens, unixpath, abstract);
- i++;
- }
- saddrlens[i] = sizeof (struct sockaddr_in6);
- saddrs[i] = GNUNET_malloc (saddrlens[i]);
-#if HAVE_SOCKADDR_IN_SIN_LEN
- ((struct sockaddr_in6 *) saddrs[i])->sin6_len = saddrlens[0];
-#endif
- ((struct sockaddr_in6 *) saddrs[i])->sin6_family = AF_INET6;
- ((struct sockaddr_in6 *) saddrs[i])->sin6_port = htons (port);
- i++;
- saddrlens[i] = sizeof (struct sockaddr_in);
- saddrs[i] = GNUNET_malloc (saddrlens[i]);
-#if HAVE_SOCKADDR_IN_SIN_LEN
- ((struct sockaddr_in *) saddrs[i])->sin_len = saddrlens[1];
-#endif
- ((struct sockaddr_in *) saddrs[i])->sin_family = AF_INET;
- ((struct sockaddr_in *) saddrs[i])->sin_port = htons (port);
- }
- }
- GNUNET_free_non_null (unixpath);
- *addrs = saddrs;
- *addr_lens = saddrlens;
- return resi;
-}
-/* end ancient copy-and-paste */
-
-
-/**
- * If a session monitor is attached, notify it about the new
- * session state.
- *
- * @param plugin our plugin
- * @param session session that changed state
- * @param state new state of the session
- */
-static void
-notify_session_monitor (struct Plugin *plugin,
- struct GNUNET_ATS_Session *session,
- enum GNUNET_TRANSPORT_SessionState state)
-{
- struct GNUNET_TRANSPORT_SessionInfo info;
-
- if (NULL == plugin->sic)
- return;
- memset (&info, 0, sizeof (info));
- info.state = state;
- info.is_inbound = GNUNET_HELLO_address_check_option (session->address,
- GNUNET_HELLO_ADDRESS_INFO_INBOUND);
- info.num_msg_pending = session->msgs_in_queue;
- info.num_bytes_pending = session->bytes_in_queue;
- if (NULL != session->receive_delay_task)
- info.receive_delay = session->receive_delay;
- info.session_timeout = session->timeout;
- info.address = session->address;
- plugin->sic (plugin->sic_cls,
- session,
- &info);
-}
-
-
-/**
- * Our external IP address/port mapping has changed.
- *
- * @param cls closure, the `struct Plugin`
- * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
- * the previous (now invalid) one
- * @param ac address class the address belongs to
- * @param addr either the previous or the new public IP address
- * @param addrlen actual length of @a addr
- */
-static void
-tcp_nat_port_map_callback (void *cls,
- int add_remove,
- enum GNUNET_NAT_AddressClass ac,
- const struct sockaddr *addr,
- socklen_t addrlen)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_HELLO_Address *address;
- struct IPv4TcpAddress t4;
- struct IPv6TcpAddress t6;
- void *arg;
- size_t args;
-
- if (GNUNET_NAT_AC_LOOPBACK == ac)
- return;
- if (GNUNET_NAT_AC_LAN == ac)
- return;
- if (GNUNET_NAT_AC_LAN_PRIVATE == ac)
- return;
- LOG (GNUNET_ERROR_TYPE_INFO,
- "NAT notification to %s address `%s'\n",
- (GNUNET_YES == add_remove) ? "add" : "remove",
- GNUNET_a2s (addr, addrlen));
- /* convert 'addr' to our internal format */
- switch (addr->sa_family)
- {
- case AF_INET:
- GNUNET_assert(addrlen == sizeof(struct sockaddr_in));
- memset (&t4, 0, sizeof(t4));
- t4.options = htonl (plugin->myoptions);
- t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
- t4.t4_port = ((struct sockaddr_in *) addr)->sin_port;
- arg = &t4;
- args = sizeof (t4);
- break;
- case AF_INET6:
- GNUNET_assert(addrlen == sizeof(struct sockaddr_in6));
- memset (&t6, 0, sizeof(t6));
- GNUNET_memcpy (&t6.ipv6_addr,
- &((struct sockaddr_in6 *) addr)->sin6_addr,
- sizeof(struct in6_addr));
- t6.options = htonl (plugin->myoptions);
- t6.t6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
- arg = &t6;
- args = sizeof (t6);
- break;
- default:
- GNUNET_break(0);
- return;
- }
- /* modify our published address list */
- GNUNET_assert ((args == sizeof (struct IPv4TcpAddress)) ||
- (args == sizeof (struct IPv6TcpAddress)));
- /* TODO: use 'ac' here in the future... */
- address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
- PLUGIN_NAME,
- arg,
- args,
- GNUNET_HELLO_ADDRESS_INFO_NONE);
- plugin->env->notify_address (plugin->env->cls,
- add_remove,
- address);
- GNUNET_HELLO_address_free (address);
-}
-
-
-/**
- * Function called for a quick conversion of the binary address to
- * a numeric address. Note that the caller must not free the
- * address and that the next call to this function is allowed
- * to override the address again.
- *
- * @param cls closure (`struct Plugin*`)
- * @param addr binary address
- * @param addrlen length of @a addr
- * @return string representing the same address
- */
-static const char *
-tcp_plugin_address_to_string (void *cls,
- const void *addr,
- size_t addrlen)
-{
- static char rbuf[INET6_ADDRSTRLEN + 12];
- char buf[INET6_ADDRSTRLEN];
- const void *sb;
- struct in_addr a4;
- struct in6_addr a6;
- const struct IPv4TcpAddress *t4;
- const struct IPv6TcpAddress *t6;
- int af;
- uint16_t port;
- uint32_t options;
-
- switch (addrlen)
- {
- case sizeof(struct IPv6TcpAddress):
- t6 = addr;
- af = AF_INET6;
- port = ntohs (t6->t6_port);
- options = ntohl (t6->options);
- GNUNET_memcpy (&a6, &t6->ipv6_addr, sizeof(a6));
- sb = &a6;
- break;
- case sizeof(struct IPv4TcpAddress):
- t4 = addr;
- af = AF_INET;
- port = ntohs (t4->t4_port);
- options = ntohl (t4->options);
- GNUNET_memcpy (&a4, &t4->ipv4_addr, sizeof(a4));
- sb = &a4;
- break;
- default:
- LOG (GNUNET_ERROR_TYPE_WARNING,
- _("Unexpected address length: %u bytes\n"),
- (unsigned int) addrlen);
- return NULL ;
- }
- if (NULL == inet_ntop (af, sb, buf, INET6_ADDRSTRLEN))
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
- "inet_ntop");
- return NULL ;
- }
- GNUNET_snprintf (rbuf, sizeof(rbuf),
- (af == AF_INET6) ? "%s.%u.[%s]:%u" : "%s.%u.%s:%u",
- PLUGIN_NAME,
- options,
- buf,
- port);
- return rbuf;
-}
-
-
-/**
- * Function called to convert a string address to
- * a binary address.
- *
- * @param cls closure (`struct Plugin*`)
- * @param addr string address
- * @param addrlen length of the address
- * @param buf location to store the buffer
- * @param added location to store the number of bytes in the buffer.
- * If the function returns #GNUNET_SYSERR, its contents are undefined.
- * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
- */
-static int
-tcp_plugin_string_to_address (void *cls,
- const char *addr,
- uint16_t addrlen,
- void **buf,
- size_t *added)
-{
- struct sockaddr_storage socket_address;
- char *address;
- char *plugin;
- char *optionstr;
- uint32_t options;
-
- /* Format tcp.options.address:port */
- address = NULL;
- plugin = NULL;
- optionstr = NULL;
- if ((NULL == addr) || (0 == addrlen))
- {
- GNUNET_break(0);
- return GNUNET_SYSERR;
- }
- if ('\0' != addr[addrlen - 1])
- {
- GNUNET_break(0);
- return GNUNET_SYSERR;
- }
- if (strlen (addr) != addrlen - 1)
- {
- GNUNET_break(0);
- return GNUNET_SYSERR;
- }
- plugin = GNUNET_strdup (addr);
- optionstr = strchr (plugin, '.');
- if (NULL == optionstr)
- {
- GNUNET_break(0);
- GNUNET_free(plugin);
- return GNUNET_SYSERR;
- }
- optionstr[0] = '\0';
- optionstr++;
- options = atol (optionstr);
- address = strchr (optionstr, '.');
- if (NULL == address)
- {
- GNUNET_break(0);
- GNUNET_free(plugin);
- return GNUNET_SYSERR;
- }
- address[0] = '\0';
- address++;
-
- if (GNUNET_OK !=
- GNUNET_STRINGS_to_address_ip (address,
- strlen (address),
- &socket_address))
- {
- GNUNET_break(0);
- GNUNET_free(plugin);
- return GNUNET_SYSERR;
- }
-
- GNUNET_free(plugin);
- switch (socket_address.ss_family)
- {
- case AF_INET:
- {
- struct IPv4TcpAddress *t4;
- struct sockaddr_in *in4 = (struct sockaddr_in *) &socket_address;
- t4 = GNUNET_new (struct IPv4TcpAddress);
- t4->options = htonl (options);
- t4->ipv4_addr = in4->sin_addr.s_addr;
- t4->t4_port = in4->sin_port;
- *buf = t4;
- *added = sizeof(struct IPv4TcpAddress);
- return GNUNET_OK;
- }
- case AF_INET6:
- {
- struct IPv6TcpAddress *t6;
- struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &socket_address;
- t6 = GNUNET_new (struct IPv6TcpAddress);
- t6->options = htonl (options);
- t6->ipv6_addr = in6->sin6_addr;
- t6->t6_port = in6->sin6_port;
- *buf = t6;
- *added = sizeof(struct IPv6TcpAddress);
- return GNUNET_OK;
- }
- default:
- return GNUNET_SYSERR;
- }
-}
-
-
-/**
- * Find the session handle for the given client.
- * Currently uses both the hashmap and the client
- * context, as the client context is new and the
- * logic still needs to be tested.
- *
- * @param plugin the plugin
- * @param client which client to find the session handle for
- * @return NULL if no matching session exists
- */
-static struct GNUNET_ATS_Session *
-lookup_session_by_client (struct Plugin *plugin,
- struct GNUNET_SERVER_Client *client)
-{
- return GNUNET_SERVER_client_get_user_context (client,
- struct GNUNET_ATS_Session);
-}
-
-
-/**
- * Functions with this signature are called whenever we need
- * to close a session due to a disconnect or failure to
- * establish a connection.
- *
- * @param cls the `struct Plugin`
- * @param session session to close down
- * @return #GNUNET_OK on success
- */
-static int
-tcp_plugin_disconnect_session (void *cls,
- struct GNUNET_ATS_Session *session)
-{
- struct Plugin *plugin = cls;
- struct PendingMessage *pm;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Disconnecting session of peer `%s' address `%s'\n",
- GNUNET_i2s (&session->target),
- tcp_plugin_address_to_string (session->plugin,
- session->address->address,
- session->address->address_length));
-
- if (NULL != session->timeout_task)
- {
- GNUNET_SCHEDULER_cancel (session->timeout_task);
- session->timeout_task = NULL;
- session->timeout = GNUNET_TIME_UNIT_ZERO_ABS;
- }
-
- if (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (plugin->sessionmap,
- &session->target,
- session))
- {
- GNUNET_STATISTICS_update (session->plugin->env->stats,
- gettext_noop ("# TCP sessions active"),
- -1,
- GNUNET_NO);
- }
- else
- {
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (plugin->nat_wait_conns,
- &session->target,
- session));
- }
- if (NULL != session->client)
- GNUNET_SERVER_client_set_user_context (session->client,
- NULL);
-
- /* clean up state */
- if (NULL != session->transmit_handle)
- {
- GNUNET_SERVER_notify_transmit_ready_cancel (session->transmit_handle);
- session->transmit_handle = NULL;
- }
- session->plugin->env->session_end (session->plugin->env->cls,
- session->address,
- session);
-
- if (NULL != session->nat_connection_timeout)
- {
- GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
- session->nat_connection_timeout = NULL;
- }
-
- while (NULL != (pm = session->pending_messages_head))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- (NULL != pm->transmit_cont)
- ? "Could not deliver message to `%s' at %s.\n"
- : "Could not deliver message to `%s' at %s, notifying.\n",
- GNUNET_i2s (&session->target),
- tcp_plugin_address_to_string (session->plugin,
- session->address->address,
- session->address->address_length));
- GNUNET_STATISTICS_update (session->plugin->env->stats,
- gettext_noop ("# bytes currently in TCP buffers"),
- -(int64_t) pm->message_size, GNUNET_NO);
- GNUNET_STATISTICS_update (session->plugin->env->stats,
- gettext_noop ("# bytes discarded by TCP (disconnect)"),
- pm->message_size,
- GNUNET_NO);
- GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
- session->pending_messages_tail,
- pm);
- GNUNET_assert (0 < session->msgs_in_queue);
- session->msgs_in_queue--;
- GNUNET_assert (pm->message_size <= session->bytes_in_queue);
- session->bytes_in_queue -= pm->message_size;
- if (NULL != pm->transmit_cont)
- pm->transmit_cont (pm->transmit_cont_cls,
- &session->target,
- GNUNET_SYSERR,
- pm->message_size,
- 0);
- GNUNET_free (pm);
- }
- GNUNET_assert (0 == session->msgs_in_queue);
- GNUNET_assert (0 == session->bytes_in_queue);
- notify_session_monitor (session->plugin,
- session,
- GNUNET_TRANSPORT_SS_DONE);
-
- if (NULL != session->receive_delay_task)
- {
- GNUNET_SCHEDULER_cancel (session->receive_delay_task);
- session->receive_delay_task = NULL;
- }
- if (NULL != session->client)
- {
- GNUNET_SERVER_client_disconnect (session->client);
- session->client = NULL;
- }
- GNUNET_HELLO_address_free (session->address);
- GNUNET_assert (NULL == session->transmit_handle);
- GNUNET_free (session);
- return GNUNET_OK;
-}
-
-
-/**
- * Function that is called to get the keepalive factor.
- * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
- * calculate the interval between keepalive packets.
- *
- * @param cls closure with the `struct Plugin`
- * @return keepalive factor
- */
-static unsigned int
-tcp_plugin_query_keepalive_factor (void *cls)
-{
- return 3;
-}
-
-
-/**
- * Session was idle for too long, so disconnect it
- *
- * @param cls the `struct GNUNET_ATS_Session` of the idle session
- */
-static void
-session_timeout (void *cls)
-{
- struct GNUNET_ATS_Session *s = cls;
- struct GNUNET_TIME_Relative left;
-
- s->timeout_task = NULL;
- left = GNUNET_TIME_absolute_get_remaining (s->timeout);
- if (0 != left.rel_value_us)
- {
- /* not actually our turn yet, but let's at least update
- the monitor, it may think we're about to die ... */
- notify_session_monitor (s->plugin,
- s,
- GNUNET_TRANSPORT_SS_UPDATE);
- s->timeout_task = GNUNET_SCHEDULER_add_delayed (left,
- &session_timeout,
- s);
- return;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Session %p was idle for %s, disconnecting\n",
- s,
- GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
- GNUNET_YES));
- /* call session destroy function */
- tcp_plugin_disconnect_session (s->plugin,
- s);
-}
-
-
-/**
- * Increment session timeout due to activity.
- *
- * @param s session to increment timeout for
- */
-static void
-reschedule_session_timeout (struct GNUNET_ATS_Session *s)
-{
- GNUNET_assert (NULL != s->timeout_task);
- s->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
-}
-
-
-/**
- * Create a new session. Also queues a welcome message.
- *
- * @param plugin the plugin
- * @param address the address to create the session for
- * @param scope network scope the address is from
- * @param client client to use, reference counter must have already been increased
- * @param is_nat this a NAT session, we should wait for a client to
- * connect to us from an address, then assign that to
- * the session
- * @return new session object
- */
-static struct GNUNET_ATS_Session *
-create_session (struct Plugin *plugin,
- const struct GNUNET_HELLO_Address *address,
- enum GNUNET_NetworkType scope,
- struct GNUNET_SERVER_Client *client,
- int is_nat)
-{
- struct GNUNET_ATS_Session *session;
- struct PendingMessage *pm;
-
- if (GNUNET_YES != is_nat)
- GNUNET_assert (NULL != client);
- else
- GNUNET_assert (NULL == client);
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Creating new session for peer `%s' at address %s\n",
- GNUNET_i2s (&address->peer),
- tcp_plugin_address_to_string (plugin,
- address->address,
- address->address_length));
- session = GNUNET_new (struct GNUNET_ATS_Session);
- session->last_activity = GNUNET_TIME_absolute_get ();
- session->plugin = plugin;
- session->is_nat = is_nat;
- if (NULL != client)
- {
- session->client = client;
- GNUNET_SERVER_client_set_user_context (client,
- session);
- }
- session->address = GNUNET_HELLO_address_copy (address);
- session->target = address->peer;
- session->expecting_welcome = GNUNET_YES;
- session->scope = scope;
- pm = GNUNET_malloc (sizeof (struct PendingMessage) +
- sizeof (struct WelcomeMessage));
- pm->msg = (const char *) &pm[1];
- pm->message_size = sizeof(struct WelcomeMessage);
- GNUNET_memcpy (&pm[1],
- &plugin->my_welcome,
- sizeof(struct WelcomeMessage));
- pm->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
- GNUNET_STATISTICS_update (plugin->env->stats,
- gettext_noop ("# bytes currently in TCP buffers"),
- pm->message_size,
- GNUNET_NO);
- GNUNET_CONTAINER_DLL_insert (session->pending_messages_head,
- session->pending_messages_tail,
- pm);
- session->msgs_in_queue++;
- session->bytes_in_queue += pm->message_size;
- session->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
- session->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
- &session_timeout,
- session);
- notify_session_monitor (session->plugin,
- session,
- GNUNET_TRANSPORT_SS_INIT);
- if (GNUNET_YES != is_nat)
- {
- GNUNET_STATISTICS_update (plugin->env->stats,
- gettext_noop ("# TCP sessions active"),
- 1,
- GNUNET_NO);
- notify_session_monitor (session->plugin,
- session,
- GNUNET_TRANSPORT_SS_UP);
- }
- else
- {
- notify_session_monitor (session->plugin,
- session,
- GNUNET_TRANSPORT_SS_HANDSHAKE);
- }
- return session;
-}
-
-
-/**
- * If we have pending messages, ask the server to
- * transmit them (schedule the respective tasks, etc.)
- *
- * @param session for which session should we do this
- */
-static void
-process_pending_messages (struct GNUNET_ATS_Session *session);
-
-
-/**
- * Function called to notify a client about the socket
- * being ready to queue more data. "buf" will be
- * NULL and "size" zero if the socket was closed for
- * writing in the meantime.
- *
- * @param cls closure
- * @param size number of bytes available in @a buf
- * @param buf where the callee should write the message
- * @return number of bytes written to @a buf
- */
-static size_t
-do_transmit (void *cls,
- size_t size,
- void *buf)
-{
- struct GNUNET_ATS_Session *session = cls;
- struct GNUNET_PeerIdentity pid;
- struct Plugin *plugin;
- struct PendingMessage *pos;
- struct PendingMessage *hd;
- struct PendingMessage *tl;
- struct GNUNET_TIME_Absolute now;
- char *cbuf;
- size_t ret;
-
- session->transmit_handle = NULL;
- plugin = session->plugin;
- if (NULL == buf)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Timeout trying to transmit to peer `%s', discarding message queue.\n",
- GNUNET_i2s (&session->target));
- /* timeout; cancel all messages that have already expired */
- hd = NULL;
- tl = NULL;
- ret = 0;
- now = GNUNET_TIME_absolute_get ();
- while ( (NULL != (pos = session->pending_messages_head)) &&
- (pos->timeout.abs_value_us <= now.abs_value_us) )
- {
- GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
- session->pending_messages_tail,
- pos);
- GNUNET_assert (0 < session->msgs_in_queue);
- session->msgs_in_queue--;
- GNUNET_assert (pos->message_size <= session->bytes_in_queue);
- session->bytes_in_queue -= pos->message_size;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Failed to transmit %u byte message to `%s'.\n",
- pos->message_size,
- GNUNET_i2s (&session->target));
- ret += pos->message_size;
- GNUNET_CONTAINER_DLL_insert_after (hd,
- tl,
- tl,
- pos);
- }
- /* do this call before callbacks (so that if callbacks destroy
- * session, they have a chance to cancel actions done by this
- * call) */
- process_pending_messages (session);
- pid = session->target;
- /* no do callbacks and do not use session again since
- * the callbacks may abort the session */
- while (NULL != (pos = hd))
- {
- GNUNET_CONTAINER_DLL_remove (hd,
- tl,
- pos);
- if (NULL != pos->transmit_cont)
- pos->transmit_cont (pos->transmit_cont_cls,
- &pid,
- GNUNET_SYSERR,
- pos->message_size,
- 0);
- GNUNET_free (pos);
- }
- GNUNET_STATISTICS_update (plugin->env->stats,
- gettext_noop ("# bytes currently in TCP buffers"), -(int64_t) ret,
- GNUNET_NO);
- GNUNET_STATISTICS_update (plugin->env->stats,
- gettext_noop ("# bytes discarded by TCP (timeout)"),
- ret,
- GNUNET_NO);
- if (0 < ret)
- notify_session_monitor (session->plugin,
- session,
- GNUNET_TRANSPORT_SS_UPDATE);
- return 0;
- }
- /* copy all pending messages that would fit */
- ret = 0;
- cbuf = buf;
- hd = NULL;
- tl = NULL;
- while (NULL != (pos = session->pending_messages_head))
- {
- if (ret + pos->message_size > size)
- break;
- GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
- session->pending_messages_tail,
- pos);
- GNUNET_assert (0 < session->msgs_in_queue);
- session->msgs_in_queue--;
- GNUNET_assert (pos->message_size <= session->bytes_in_queue);
- session->bytes_in_queue -= pos->message_size;
- GNUNET_assert(size >= pos->message_size);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting message of type %u size %u to peer %s at %s\n",
- ntohs (((struct GNUNET_MessageHeader *) pos->msg)->type),
- pos->message_size,
- GNUNET_i2s (&session->target),
- tcp_plugin_address_to_string (session->plugin,
- session->address->address,
- session->address->address_length));
- /* FIXME: this GNUNET_memcpy can be up to 7% of our total runtime */
- GNUNET_memcpy (cbuf,
- pos->msg,
- pos->message_size);
- cbuf += pos->message_size;
- ret += pos->message_size;
- size -= pos->message_size;
- GNUNET_CONTAINER_DLL_insert_tail (hd,
- tl,
- pos);
- }
- notify_session_monitor (session->plugin,
- session,
- GNUNET_TRANSPORT_SS_UPDATE);
- /* schedule 'continuation' before callbacks so that callbacks that
- * cancel everything don't cause us to use a session that no longer
- * exists... */
- process_pending_messages (session);
- session->last_activity = GNUNET_TIME_absolute_get ();
- pid = session->target;
- /* we'll now call callbacks that may cancel the session; hence
- * we should not use 'session' after this point */
- while (NULL != (pos = hd))
- {
- GNUNET_CONTAINER_DLL_remove (hd, tl, pos);
- if (NULL != pos->transmit_cont)
- pos->transmit_cont (pos->transmit_cont_cls,
- &pid,
- GNUNET_OK,
- pos->message_size,
- pos->message_size); /* FIXME: include TCP overhead */
- GNUNET_free (pos);
- }
- GNUNET_assert (NULL == hd);
- GNUNET_assert (NULL == tl);
- GNUNET_STATISTICS_update (plugin->env->stats,
- gettext_noop ("# bytes currently in TCP buffers"),
- - (int64_t) ret,
- GNUNET_NO);
- GNUNET_STATISTICS_update (plugin->env->stats,
- gettext_noop ("# bytes transmitted via TCP"),
- ret,
- GNUNET_NO);
- return ret;
-}
-
-
-/**
- * If we have pending messages, ask the server to
- * transmit them (schedule the respective tasks, etc.)
- *
- * @param session for which session should we do this
- */
-static void
-process_pending_messages (struct GNUNET_ATS_Session *session)
-{
- struct PendingMessage *pm;
-
- GNUNET_assert (NULL != session->client);
- if (NULL != session->transmit_handle)
- return;
- if (NULL == (pm = session->pending_messages_head))
- return;
-
- session->transmit_handle
- = GNUNET_SERVER_notify_transmit_ready (session->client,
- pm->message_size,
- GNUNET_TIME_absolute_get_remaining (pm->timeout),
- &do_transmit,
- session);
-}
-
-
-/**
- * Function that can be used by the transport service to transmit
- * a message using the plugin. Note that in the case of a
- * peer disconnecting, the continuation MUST be called
- * prior to the disconnect notification itself. This function
- * will be called with this peer's HELLO message to initiate
- * a fresh connection to another peer.
- *
- * @param cls closure
- * @param session which session must be used
- * @param msgbuf the message to transmit
- * @param msgbuf_size number of bytes in @a msgbuf
- * @param priority how important is the message (most plugins will
- * ignore message priority and just FIFO)
- * @param to how long to wait at most for the transmission (does not
- * require plugins to discard the message after the timeout,
- * just advisory for the desired delay; most plugins will ignore
- * this as well)
- * @param cont continuation to call once the message has
- * been transmitted (or if the transport is ready
- * for the next transmission call; or if the
- * peer disconnected...); can be NULL
- * @param cont_cls closure for @a cont
- * @return number of bytes used (on the physical network, with overheads);
- * -1 on hard errors (i.e. address invalid); 0 is a legal value
- * and does NOT mean that the message was not transmitted (DV)
- */
-static ssize_t
-tcp_plugin_send (void *cls,
- struct GNUNET_ATS_Session *session,
- const char *msgbuf,
- size_t msgbuf_size,
- unsigned int priority,
- struct GNUNET_TIME_Relative to,
- GNUNET_TRANSPORT_TransmitContinuation cont,
- void *cont_cls)
-{
- struct Plugin * plugin = cls;
- struct PendingMessage *pm;
-
- /* create new message entry */
- pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
- pm->msg = (const char *) &pm[1];
- GNUNET_memcpy (&pm[1], msgbuf, msgbuf_size);
- pm->message_size = msgbuf_size;
- pm->timeout = GNUNET_TIME_relative_to_absolute (to);
- pm->transmit_cont = cont;
- pm->transmit_cont_cls = cont_cls;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Asked to transmit %u bytes to `%s', added message to list.\n",
- msgbuf_size,
- GNUNET_i2s (&session->target));
-
- if (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
- &session->target,
- session))
- {
- GNUNET_assert (NULL != session->client);
- GNUNET_SERVER_client_set_timeout (session->client,
- GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
- GNUNET_STATISTICS_update (plugin->env->stats,
- gettext_noop ("# bytes currently in TCP buffers"),
- msgbuf_size,
- GNUNET_NO);
-
- /* append pm to pending_messages list */
- GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
- session->pending_messages_tail,
- pm);
- notify_session_monitor (session->plugin,
- session,
- GNUNET_TRANSPORT_SS_UPDATE);
- session->msgs_in_queue++;
- session->bytes_in_queue += pm->message_size;
- process_pending_messages (session);
- return msgbuf_size;
- }
- if (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_contains_value (plugin->nat_wait_conns,
- &session->target,
- session))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "This NAT WAIT session for peer `%s' is not yet ready!\n",
- GNUNET_i2s (&session->target));
- GNUNET_STATISTICS_update (plugin->env->stats,
- gettext_noop ("# bytes currently in TCP buffers"), msgbuf_size,
- GNUNET_NO);
- /* append pm to pending_messages list */
- GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
- session->pending_messages_tail,
- pm);
- session->msgs_in_queue++;
- session->bytes_in_queue += pm->message_size;
- notify_session_monitor (session->plugin,
- session,
- GNUNET_TRANSPORT_SS_HANDSHAKE);
- return msgbuf_size;
- }
- LOG (GNUNET_ERROR_TYPE_ERROR,
- "Invalid session %p\n",
- session);
- if (NULL != cont)
- cont (cont_cls,
- &session->target,
- GNUNET_SYSERR,
- pm->message_size,
- 0);
- GNUNET_break (0);
- GNUNET_free (pm);
- return GNUNET_SYSERR; /* session does not exist here */
-}
-
-
-/**
- * Closure for #session_lookup_it().
- */
-struct GNUNET_ATS_SessionItCtx
-{
- /**
- * Address we are looking for.
- */
- const struct GNUNET_HELLO_Address *address;
-
- /**
- * Where to store the session (if we found it).
- */
- struct GNUNET_ATS_Session *result;
-
-};
-
-
-/**
- * Look for a session by address.
- *
- * @param cls the `struct GNUNET_ATS_SessionItCtx`
- * @param key unused
- * @param value a `struct GNUNET_ATS_Session`
- * @return #GNUNET_YES to continue looking, #GNUNET_NO if we found the session
- */
-static int
-session_lookup_it (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
-{
- struct GNUNET_ATS_SessionItCtx *si_ctx = cls;
- struct GNUNET_ATS_Session *session = value;
-
- if (0 !=
- GNUNET_HELLO_address_cmp (si_ctx->address,
- session->address))
- return GNUNET_YES;
- si_ctx->result = session;
- return GNUNET_NO;
-}
-
-
-/**
- * Task cleaning up a NAT connection attempt after timeout
- *
- * @param cls the `struct GNUNET_ATS_Session`
- */
-static void
-nat_connect_timeout (void *cls)
-{
- struct GNUNET_ATS_Session *session = cls;
-
- session->nat_connection_timeout = NULL;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "NAT WAIT connection to `%4s' at `%s' could not be established, removing session\n",
- GNUNET_i2s (&session->target),
- tcp_plugin_address_to_string (session->plugin,
- session->address->address,
- session->address->address_length));
- tcp_plugin_disconnect_session (session->plugin,
- session);
-}
-
-
-/**
- * Function that will be called whenever the transport service wants to
- * notify the plugin that a session is still active and in use and
- * therefore the session timeout for this session has to be updated
- *
- * @param cls closure
- * @param peer which peer was the session for
- * @param session which session is being updated
- */
-static void
-tcp_plugin_update_session_timeout (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- struct GNUNET_ATS_Session *session)
-{
- reschedule_session_timeout (session);
-}
-
-
-/**
- * Task to signal the server that we can continue
- * receiving from the TCP client now.
- *
- * @param cls the `struct GNUNET_ATS_Session *`
- */
-static void
-delayed_done (void *cls)
-{
- struct GNUNET_ATS_Session *session = cls;
-
- session->receive_delay_task = NULL;
- reschedule_session_timeout (session);
- GNUNET_SERVER_receive_done (session->client,
- GNUNET_OK);
-}
-
-
-/**
- * Function that will be called whenever the transport service wants to
- * notify the plugin that the inbound quota changed and that the plugin
- * should update it's delay for the next receive value
- *
- * @param cls closure
- * @param peer which peer was the session for
- * @param session which session is being updated
- * @param delay new delay to use for receiving
- */
-static void
-tcp_plugin_update_inbound_delay (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- struct GNUNET_ATS_Session *session,
- struct GNUNET_TIME_Relative delay)
-{
- if (NULL == session->receive_delay_task)
- return;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "New inbound delay %s\n",
- GNUNET_STRINGS_relative_time_to_string (delay,
- GNUNET_NO));
- session->receive_delay = GNUNET_TIME_relative_to_absolute (delay);
- GNUNET_SCHEDULER_cancel (session->receive_delay_task);
- session->receive_delay_task = GNUNET_SCHEDULER_add_delayed (delay,
- &delayed_done,
- session);
-}
-
-
-/**
- * Create a new session to transmit data to the target
- * This session will used to send data to this peer and the plugin will
- * notify us by calling the env->session_end function
- *
- * @param cls closure
- * @param address the address to use
- * @return the session if the address is valid, NULL otherwise
- */
-static struct GNUNET_ATS_Session *
-tcp_plugin_get_session (void *cls,
- const struct GNUNET_HELLO_Address *address)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session = NULL;
- int af;
- const void *sb;
- size_t sbs;
- struct GNUNET_CONNECTION_Handle *sa;
- struct sockaddr_in a4;
- struct sockaddr_in6 a6;
- const struct IPv4TcpAddress *t4;
- const struct IPv6TcpAddress *t6;
- unsigned int options;
- enum GNUNET_NetworkType net_type;
- unsigned int is_natd = GNUNET_NO;
- size_t addrlen;
-#ifdef TCP_STEALTH
- struct GNUNET_NETWORK_Handle *s;
-#endif
-
- addrlen = address->address_length;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Trying to get session for `%s' address of peer `%s'\n",
- tcp_plugin_address_to_string (plugin,
- address->address,
- address->address_length),
- GNUNET_i2s (&address->peer));
-
- if (GNUNET_HELLO_address_check_option (address,
- GNUNET_HELLO_ADDRESS_INFO_INBOUND))
- {
- GNUNET_break (0);
- return NULL;
- }
-
- /* look for existing session */
- if (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_contains (plugin->sessionmap,
- &address->peer))
- {
- struct GNUNET_ATS_SessionItCtx si_ctx;
-
- si_ctx.address = address;
- si_ctx.result = NULL;
- GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap,
- &address->peer,
- &session_lookup_it,
- &si_ctx);
- if (NULL != si_ctx.result)
- {
- session = si_ctx.result;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Found existing session for `%s' address `%s'\n",
- GNUNET_i2s (&address->peer),
- tcp_plugin_address_to_string (plugin,
- address->address,
- address->address_length));
- return session;
- }
- /* This is a bit of a hack, limiting TCP to never allow more than
- one TCP connection to any given peer at the same time.
- Without this, peers sometimes disagree about which of the TCP
- connections they should use, causing one side to believe that
- they transmit successfully, while the other receives nothing. */
- return NULL; /* Refuse to have more than one TCP connection per
- peer pair at the same time. */
- }
-
- if (addrlen == sizeof(struct IPv6TcpAddress))
- {
- GNUNET_assert (NULL != address->address); /* make static analysis happy */
- t6 = address->address;
- options = t6->options;
- af = AF_INET6;
- memset (&a6, 0, sizeof(a6));
-#if HAVE_SOCKADDR_IN_SIN_LEN
- a6.sin6_len = sizeof (a6);
-#endif
- a6.sin6_family = AF_INET6;
- a6.sin6_port = t6->t6_port;
- if (t6->t6_port == 0)
- is_natd = GNUNET_YES;
- GNUNET_memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof(struct in6_addr));
- sb = &a6;
- sbs = sizeof(a6);
- }
- else if (addrlen == sizeof(struct IPv4TcpAddress))
- {
- GNUNET_assert(NULL != address->address); /* make static analysis happy */
- t4 = address->address;
- options = t4->options;
- af = AF_INET;
- memset (&a4, 0, sizeof(a4));
-#if HAVE_SOCKADDR_IN_SIN_LEN
- a4.sin_len = sizeof (a4);
-#endif
- a4.sin_family = AF_INET;
- a4.sin_port = t4->t4_port;
- if (t4->t4_port == 0)
- is_natd = GNUNET_YES;
- a4.sin_addr.s_addr = t4->ipv4_addr;
- sb = &a4;
- sbs = sizeof(a4);
- }
- else
- {
- GNUNET_STATISTICS_update (plugin->env->stats,
- gettext_noop ("# requests to create session with invalid address"),
- 1,
- GNUNET_NO);
- return NULL;
- }
-
- net_type = plugin->env->get_address_type (plugin->env->cls,
- sb,
- sbs);
- GNUNET_break (net_type != GNUNET_NT_UNSPECIFIED);
-
- if ( (is_natd == GNUNET_YES) &&
- (addrlen == sizeof(struct IPv6TcpAddress)) )
- {
- /* NAT client only works with IPv4 addresses */
- return NULL;
- }
-
- if (plugin->cur_connections >= plugin->max_connections)
- {
- /* saturated */
- return NULL;
- }
-
- if ( (is_natd == GNUNET_YES) &&
- (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns,
- &address->peer)))
- {
- /* Only do one NAT punch attempt per peer identity */
- return NULL;
- }
-
- if ( (is_natd == GNUNET_YES) &&
- (NULL != plugin->nat) &&
- (GNUNET_NO ==
- GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns,
- &address->peer)))
- {
- struct sockaddr_in local_sa;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Found valid IPv4 NAT address (creating session)!\n");
- session = create_session (plugin,
- address,
- net_type,
- NULL,
- GNUNET_YES);
- session->nat_connection_timeout = GNUNET_SCHEDULER_add_delayed (NAT_TIMEOUT,
- &nat_connect_timeout,
- session);
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CONTAINER_multipeermap_put (plugin->nat_wait_conns,
- &session->target,
- session,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Created NAT WAIT connection to `%s' at `%s'\n",
- GNUNET_i2s (&session->target),
- GNUNET_a2s (sb, sbs));
- memset (&local_sa,
- 0,
- sizeof (local_sa));
- local_sa.sin_family = AF_INET;
- local_sa.sin_port = htons (plugin->open_port);
- /* We leave sin_address at 0, let the kernel figure it out,
- even if our bind() is more specific. (May want to reconsider
- later.) */
- if (GNUNET_OK ==
- GNUNET_NAT_request_reversal (plugin->nat,
- &local_sa,
- &a4))
- return session;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Running NAT client for `%s' at `%s' failed\n",
- GNUNET_i2s (&session->target),
- GNUNET_a2s (sb, sbs));
- tcp_plugin_disconnect_session (plugin,
- session);
- return NULL;
- }
-
- /* create new outbound session */
- if (0 != (options & TCP_OPTIONS_TCP_STEALTH))
- {
-#ifdef TCP_STEALTH
- s = GNUNET_NETWORK_socket_create (af, SOCK_STREAM, 0);
- if (NULL == s)
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
- "socket");
- sa = NULL;
- }
- else
- {
- if ( (GNUNET_OK !=
- GNUNET_NETWORK_socket_setsockopt (s,
- IPPROTO_TCP,
- TCP_STEALTH,
- &session->target,
- sizeof (struct GNUNET_PeerIdentity))) ||
- (GNUNET_OK !=
- GNUNET_NETWORK_socket_setsockopt (s,
- IPPROTO_TCP,
- TCP_STEALTH_INTEGRITY,
- &plugin->my_welcome,
- sizeof (struct WelcomeMessage))) )
- {
- /* TCP STEALTH not supported by kernel */
- GNUNET_break (GNUNET_OK ==
- GNUNET_NETWORK_socket_close (s));
- sa = NULL;
- }
- else
- {
- sa = GNUNET_CONNECTION_connect_socket (s, sb, sbs);
- }
- }
-#else
- sa = NULL;
-#endif
- }
- else
- {
- sa = GNUNET_CONNECTION_create_from_sockaddr (af, sb, sbs);
- }
- if (NULL == sa)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Failed to create connection to `%s' at `%s'\n",
- GNUNET_i2s (&address->peer),
- GNUNET_a2s (sb, sbs));
- return NULL;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Asked to transmit to `%s', creating fresh session using address `%s'.\n",
- GNUNET_i2s (&address->peer),
- GNUNET_a2s (sb, sbs));
-
- session = create_session (plugin,
- address,
- net_type,
- GNUNET_SERVER_connect_socket (plugin->server,
- sa),
- GNUNET_NO);
- (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
- &session->target,
- session,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
- /* Send TCP Welcome */
- process_pending_messages (session);
-
- return session;
-}
-
-
-/**
- * We have been asked to destroy all connections to a particular peer.
- * This function is called on each applicable session and must tear it
- * down.
- *
- * @param cls the `struct Plugin *`
- * @param key the peer which the session belongs to (unused)
- * @param value the `struct GNUNET_ATS_Session`
- * @return #GNUNET_YES (continue to iterate)
- */
-static int
-session_disconnect_it (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session = value;
-
- GNUNET_STATISTICS_update (session->plugin->env->stats,
- gettext_noop ("# transport-service disconnect requests for TCP"),
- 1,
- GNUNET_NO);
- tcp_plugin_disconnect_session (plugin,
- session);
- return GNUNET_YES;
-}
-
-
-/**
- * Function that can be called to force a disconnect from the
- * specified neighbour. This should also cancel all previously
- * scheduled transmissions. Obviously the transmission may have been
- * partially completed already, which is OK. The plugin is supposed
- * to close the connection (if applicable) and no longer call the
- * transmit continuation(s).
- *
- * Finally, plugin MUST NOT call the services's receive function to
- * notify the service that the connection to the specified target was
- * closed after a getting this call.
- *
- * @param cls closure
- * @param target peer for which the last transmission is
- * to be cancelled
- */
-static void
-tcp_plugin_disconnect (void *cls,
- const struct GNUNET_PeerIdentity *target)
-{
- struct Plugin *plugin = cls;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Disconnecting peer `%s'\n",
- GNUNET_i2s (target));
- GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap,
- target,
- &session_disconnect_it,
- plugin);
- GNUNET_CONTAINER_multipeermap_get_multiple (plugin->nat_wait_conns,
- target,
- &session_disconnect_it,
- plugin);
-}
-
-
-/**
- * We are processing an address pretty printing request and finished
- * the IP resolution (if applicable). Append our port and forward the
- * result. If called with @a hostname NULL, we are done and should
- * clean up the pretty printer (otherwise, there might be multiple
- * hostnames for the IP address and we might receive more).
- *
- * @param cls the `struct PrettyPrinterContext *`
- * @param hostname hostname part of the address
- */
-static void
-append_port (void *cls,
- const char *hostname)
-{
- struct PrettyPrinterContext *ppc = cls;
- struct Plugin *plugin = ppc->plugin;
- char *ret;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "append_port called with hostname `%s'\n",
- hostname);
- if (NULL == hostname)
- {
- /* Final call, done */
- ppc->resolver_handle = NULL;
- GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
- plugin->ppc_dll_tail,
- ppc);
- ppc->asc (ppc->asc_cls,
- NULL,
- GNUNET_OK);
- GNUNET_free (ppc);
- return;
- }
- if (GNUNET_YES == ppc->ipv6)
- GNUNET_asprintf (&ret,
- "%s.%u.[%s]:%d",
- PLUGIN_NAME,
- ppc->options,
- hostname,
- ppc->port);
- else
- GNUNET_asprintf (&ret,
- "%s.%u.%s:%d",
- PLUGIN_NAME,
- ppc->options,
- hostname,
- ppc->port);
- ppc->asc (ppc->asc_cls,
- ret,
- GNUNET_OK);
- GNUNET_free (ret);
-}
-
-
-/**
- * Convert the transports address to a nice, human-readable format.
- *
- * @param cls closure with the `struct Plugin`
- * @param type name of the transport that generated the address
- * @param addr one of the addresses of the host, NULL for the last address
- * the specific address format depends on the transport
- * @param addrlen length of the @a addr
- * @param numeric should (IP) addresses be displayed in numeric form?
- * @param timeout after how long should we give up?
- * @param asc function to call on each string
- * @param asc_cls closure for @a asc
- */
-static void
-tcp_plugin_address_pretty_printer (void *cls,
- const char *type,
- const void *addr,
- size_t addrlen,
- int numeric,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_TRANSPORT_AddressStringCallback asc,
- void *asc_cls)
-{
- struct Plugin *plugin = cls;
- struct PrettyPrinterContext *ppc;
- const void *sb;
- size_t sbs;
- struct sockaddr_in a4;
- struct sockaddr_in6 a6;
- const struct IPv4TcpAddress *t4;
- const struct IPv6TcpAddress *t6;
- uint16_t port;
- uint32_t options;
-
- if (sizeof(struct IPv6TcpAddress) == addrlen)
- {
- t6 = addr;
- memset (&a6, 0, sizeof(a6));
- a6.sin6_family = AF_INET6;
- a6.sin6_port = t6->t6_port;
- GNUNET_memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof(struct in6_addr));
- port = ntohs (t6->t6_port);
- options = ntohl (t6->options);
- sb = &a6;
- sbs = sizeof(a6);
- }
- else if (sizeof(struct IPv4TcpAddress) == addrlen)
- {
- t4 = addr;
- memset (&a4, 0, sizeof(a4));
- a4.sin_family = AF_INET;
- a4.sin_port = t4->t4_port;
- a4.sin_addr.s_addr = t4->ipv4_addr;
- port = ntohs (t4->t4_port);
- options = ntohl (t4->options);
- sb = &a4;
- sbs = sizeof(a4);
- }
- else
- {
- /* invalid address */
- LOG (GNUNET_ERROR_TYPE_WARNING,
- _("Unexpected address length: %u bytes\n"),
- (unsigned int) addrlen);
- asc (asc_cls, NULL, GNUNET_SYSERR);
- asc (asc_cls, NULL, GNUNET_OK);
- return;
- }
- ppc = GNUNET_new (struct PrettyPrinterContext);
- ppc->plugin = plugin;
- if (addrlen == sizeof(struct IPv6TcpAddress))
- ppc->ipv6 = GNUNET_YES;
- else
- ppc->ipv6 = GNUNET_NO;
- ppc->asc = asc;
- ppc->asc_cls = asc_cls;
- ppc->port = port;
- ppc->options = options;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Starting DNS reverse lookup\n");
- ppc->resolver_handle = GNUNET_RESOLVER_hostname_get (sb,
- sbs,
- ! numeric,
- timeout,
- &append_port,
- ppc);
- if (NULL == ppc->resolver_handle)
- {
- GNUNET_break (0);
- GNUNET_free (ppc);
- return;
- }
- GNUNET_CONTAINER_DLL_insert (plugin->ppc_dll_head,
- plugin->ppc_dll_tail,
- ppc);
-}
-
-
-/**
- * Function that will be called to check if a binary address for this
- * plugin is well-formed and corresponds to an address for THIS peer
- * (as per our configuration). Naturally, if absolutely necessary,
- * plugins can be a bit conservative in their answer, but in general
- * plugins should make sure that the address does not redirect
- * traffic to a 3rd party that might try to man-in-the-middle our
- * traffic.
- *
- * @param cls closure, our `struct Plugin *`
- * @param addr pointer to the address
- * @param addrlen length of @a addr
- * @return #GNUNET_OK if this is a plausible address for this peer
- * and transport, #GNUNET_SYSERR if not
- */
-static int
-tcp_plugin_check_address (void *cls,
- const void *addr,
- size_t addrlen)
-{
- struct Plugin *plugin = cls;
- const struct IPv4TcpAddress *v4;
- const struct IPv6TcpAddress *v6;
-
- if ( (addrlen != sizeof(struct IPv4TcpAddress)) &&
- (addrlen != sizeof(struct IPv6TcpAddress)) )
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
-
- if (addrlen == sizeof(struct IPv4TcpAddress))
- {
- struct sockaddr_in s4;
-
- v4 = (const struct IPv4TcpAddress *) addr;
- if (0 != memcmp (&v4->options,
- &plugin->myoptions,
- sizeof(uint32_t)))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- memset (&s4, 0, sizeof (s4));
- s4.sin_family = AF_INET;
-#if HAVE_SOCKADDR_IN_SIN_LEN
- s4.sin_len = sizeof (s4);
-#endif
- s4.sin_port = v4->t4_port;
- s4.sin_addr.s_addr = v4->ipv4_addr;
-
- if (GNUNET_OK !=
- GNUNET_NAT_test_address (plugin->nat,
- &s4,
- sizeof (struct sockaddr_in)))
- return GNUNET_SYSERR;
- }
- else
- {
- struct sockaddr_in6 s6;
-
- v6 = (const struct IPv6TcpAddress *) addr;
- if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (0 != memcmp (&v6->options,
- &plugin->myoptions,
- sizeof (uint32_t)))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- memset (&s6, 0, sizeof (s6));
- s6.sin6_family = AF_INET6;
-#if HAVE_SOCKADDR_IN_SIN_LEN
- s6.sin6_len = sizeof (s6);
-#endif
- s6.sin6_port = v6->t6_port;
- s6.sin6_addr = v6->ipv6_addr;
-
- if (GNUNET_OK !=
- GNUNET_NAT_test_address (plugin->nat,
- &s6,
- sizeof(struct sockaddr_in6)))
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
-}
-
-
-/**
- * We've received a nat probe from this peer via TCP. Finish
- * creating the client session and resume sending of queued
- * messages.
- *
- * @param cls closure
- * @param client identification of the client
- * @param message the actual message
- */
-static void
-handle_tcp_nat_probe (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session;
- const struct TCP_NAT_ProbeMessage *tcp_nat_probe;
- size_t alen;
- void *vaddr;
- struct IPv4TcpAddress *t4;
- struct IPv6TcpAddress *t6;
- const struct sockaddr_in *s4;
- const struct sockaddr_in6 *s6;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Received NAT probe\n");
- /* We have received a TCP NAT probe, meaning we (hopefully) initiated
- * a connection to this peer by running gnunet-nat-client. This peer
- * received the punch message and now wants us to use the new connection
- * as the default for that peer. Do so and then send a WELCOME message
- * so we can really be connected!
- */
- if (ntohs (message->size) != sizeof(struct TCP_NAT_ProbeMessage))
- {
- GNUNET_break_op(0);
- GNUNET_SERVER_receive_done (client,
- GNUNET_SYSERR);
- return;
- }
-
- tcp_nat_probe = (const struct TCP_NAT_ProbeMessage *) message;
- if (0 == memcmp (&tcp_nat_probe->clientIdentity, plugin->env->my_identity,
- sizeof(struct GNUNET_PeerIdentity)))
- {
- /* refuse connections from ourselves */
- GNUNET_SERVER_receive_done (client,
- GNUNET_SYSERR);
- return;
- }
-
- session = GNUNET_CONTAINER_multipeermap_get (plugin->nat_wait_conns,
- &tcp_nat_probe->clientIdentity);
- if (NULL == session)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Did NOT find session for NAT probe!\n");
- GNUNET_SERVER_receive_done (client,
- GNUNET_OK);
- return;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Found session for NAT probe!\n");
-
- if (NULL != session->nat_connection_timeout)
- {
- GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
- session->nat_connection_timeout = NULL;
- }
-
- if (GNUNET_OK !=
- GNUNET_SERVER_client_get_address (client,
- &vaddr,
- &alen))
- {
- GNUNET_break(0);
- GNUNET_SERVER_receive_done (client,
- GNUNET_SYSERR);
- tcp_plugin_disconnect_session (plugin,
- session);
- return;
- }
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (plugin->nat_wait_conns,
- &tcp_nat_probe->clientIdentity,
- session));
- GNUNET_SERVER_client_set_user_context (client,
- session);
- (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
- &session->target,
- session,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
- session->last_activity = GNUNET_TIME_absolute_get ();
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Found address `%s' for incoming connection\n",
- GNUNET_a2s (vaddr, alen));
- switch (((const struct sockaddr *) vaddr)->sa_family)
- {
- case AF_INET:
- s4 = vaddr;
- t4 = GNUNET_new (struct IPv4TcpAddress);
- t4->options = htonl (TCP_OPTIONS_NONE);
- t4->t4_port = s4->sin_port;
- t4->ipv4_addr = s4->sin_addr.s_addr;
- session->address = GNUNET_HELLO_address_allocate (&tcp_nat_probe->clientIdentity,
- PLUGIN_NAME,
- &t4,
- sizeof(struct IPv4TcpAddress),
- GNUNET_HELLO_ADDRESS_INFO_NONE);
- break;
- case AF_INET6:
- s6 = vaddr;
- t6 = GNUNET_new (struct IPv6TcpAddress);
- t6->options = htonl (TCP_OPTIONS_NONE);
- t6->t6_port = s6->sin6_port;
- GNUNET_memcpy (&t6->ipv6_addr, &s6->sin6_addr, sizeof(struct in6_addr));
- session->address = GNUNET_HELLO_address_allocate (&tcp_nat_probe->clientIdentity,
- PLUGIN_NAME,
- &t6,
- sizeof(struct IPv6TcpAddress),
- GNUNET_HELLO_ADDRESS_INFO_NONE);
- break;
- default:
- GNUNET_break_op(0);
- LOG(GNUNET_ERROR_TYPE_DEBUG,
- "Bad address for incoming connection!\n");
- GNUNET_free(vaddr);
- GNUNET_SERVER_receive_done (client,
- GNUNET_SYSERR);
- tcp_plugin_disconnect_session (plugin,
- session);
- return;
- }
- GNUNET_free (vaddr);
- GNUNET_break (NULL == session->client);
- session->client = client;
- GNUNET_STATISTICS_update (plugin->env->stats,
- gettext_noop ("# TCP sessions active"),
- 1,
- GNUNET_NO);
- process_pending_messages (session);
- GNUNET_SERVER_receive_done (client,
- GNUNET_OK);
-}
-
-
-/**
- * We've received a welcome from this peer via TCP. Possibly create a
- * fresh client record and send back our welcome.
- *
- * @param cls closure
- * @param client identification of the client
- * @param message the actual message
- */
-static void
-handle_tcp_welcome (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
-{
- struct Plugin *plugin = cls;
- const struct WelcomeMessage *wm = (const struct WelcomeMessage *) message;
- struct GNUNET_HELLO_Address *address;
- struct GNUNET_ATS_Session *session;
- size_t alen;
- void *vaddr;
- struct IPv4TcpAddress t4;
- struct IPv6TcpAddress t6;
- const struct sockaddr_in *s4;
- const struct sockaddr_in6 *s6;
-
- if (0 == memcmp (&wm->clientIdentity,
- plugin->env->my_identity,
- sizeof(struct GNUNET_PeerIdentity)))
- {
- /* refuse connections from ourselves */
- if (GNUNET_OK ==
- GNUNET_SERVER_client_get_address (client,
- &vaddr,
- &alen))
- {
- LOG (GNUNET_ERROR_TYPE_INFO,
- "Received WELCOME message from my own identity `%s' on address `%s'\n",
- GNUNET_i2s (&wm->clientIdentity),
- GNUNET_a2s (vaddr, alen));
- GNUNET_free (vaddr);
- }
- GNUNET_SERVER_receive_done (client,
- GNUNET_SYSERR);
- return;
- }
-
- if (GNUNET_OK ==
- GNUNET_SERVER_client_get_address (client,
- &vaddr,
- &alen))
- {
- LOG(GNUNET_ERROR_TYPE_DEBUG,
- "Received WELCOME message from `%s' on address `%s'\n",
- GNUNET_i2s (&wm->clientIdentity),
- GNUNET_a2s (vaddr, alen));
- GNUNET_free (vaddr);
- }
- GNUNET_STATISTICS_update (plugin->env->stats,
- gettext_noop ("# TCP WELCOME messages received"),
- 1,
- GNUNET_NO);
- session = lookup_session_by_client (plugin,
- client);
- if (NULL != session)
- {
- if (GNUNET_OK ==
- GNUNET_SERVER_client_get_address (client,
- &vaddr,
- &alen))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Found existing session %p for peer `%s'\n",
- session,
- GNUNET_a2s (vaddr, alen));
- GNUNET_free (vaddr);
- }
- }
- else
- {
- if (GNUNET_OK ==
- GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
- {
- if (alen == sizeof(struct sockaddr_in))
- {
- s4 = vaddr;
- memset (&t4, '\0', sizeof (t4));
- t4.options = htonl (TCP_OPTIONS_NONE);
- t4.t4_port = s4->sin_port;
- t4.ipv4_addr = s4->sin_addr.s_addr;
- address = GNUNET_HELLO_address_allocate (&wm->clientIdentity,
- PLUGIN_NAME,
- &t4,
- sizeof(t4),
- GNUNET_HELLO_ADDRESS_INFO_INBOUND);
- }
- else if (alen == sizeof(struct sockaddr_in6))
- {
- s6 = vaddr;
- memset (&t6, '\0', sizeof (t6));
- t6.options = htonl (TCP_OPTIONS_NONE);
- t6.t6_port = s6->sin6_port;
- GNUNET_memcpy (&t6.ipv6_addr, &s6->sin6_addr, sizeof(struct in6_addr));
- address = GNUNET_HELLO_address_allocate (&wm->clientIdentity,
- PLUGIN_NAME,
- &t6,
- sizeof (t6),
- GNUNET_HELLO_ADDRESS_INFO_INBOUND);
- }
- else
- {
- GNUNET_break (0);
- GNUNET_free_non_null (vaddr);
- GNUNET_SERVER_receive_done (client,
- GNUNET_SYSERR);
- return;
- }
- session = create_session (plugin,
- address,
- plugin->env->get_address_type (plugin->env->cls,
- vaddr,
- alen),
- client,
- GNUNET_NO);
- GNUNET_break (GNUNET_NT_UNSPECIFIED != session->scope);
- GNUNET_HELLO_address_free (address);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Creating new%s session %p for peer `%s' client %p\n",
- GNUNET_HELLO_address_check_option (session->address,
- GNUNET_HELLO_ADDRESS_INFO_INBOUND)
- ? " inbound" : "",
- session,
- tcp_plugin_address_to_string (plugin,
- session->address->address,
- session->address->address_length),
- client);
- GNUNET_free (vaddr);
- (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
- &session->target,
- session,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
- /* Notify transport and ATS about new session */
- plugin->env->session_start (plugin->env->cls,
- session->address,
- session,
- session->scope);
- }
- else
- {
- LOG(GNUNET_ERROR_TYPE_DEBUG,
- "Did not obtain TCP socket address for incoming connection\n");
- GNUNET_break(0);
- GNUNET_SERVER_receive_done (client,
- GNUNET_SYSERR);
- return;
- }
- }
-
- if (GNUNET_YES != session->expecting_welcome)
- {
- GNUNET_break_op (0);
- GNUNET_SERVER_receive_done (client,
- GNUNET_SYSERR);
- return;
- }
- session->last_activity = GNUNET_TIME_absolute_get ();
- session->expecting_welcome = GNUNET_NO;
-
- process_pending_messages (session);
- GNUNET_SERVER_client_set_timeout (client,
- GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
- GNUNET_SERVER_receive_done (client,
- GNUNET_OK);
-}
-
-
-/**
- * We've received data for this peer via TCP. Unbox,
- * compute latency and forward.
- *
- * @param cls closure
- * @param client identification of the client
- * @param message the actual message
- */
-static void
-handle_tcp_data (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session;
- struct GNUNET_TIME_Relative delay;
- uint16_t type;
-
- type = ntohs (message->type);
- if ( (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME == type) ||
- (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE == type) )
- {
- /* We don't want to propagate WELCOME and NAT Probe messages up! */
- GNUNET_SERVER_receive_done (client,
- GNUNET_OK);
- return;
- }
- session = lookup_session_by_client (plugin, client);
- if (NULL == session)
- {
- /* No inbound session found */
- void *vaddr = NULL;
- size_t alen;
-
- GNUNET_assert (GNUNET_OK ==
- GNUNET_SERVER_client_get_address (client,
- &vaddr,
- &alen));
- LOG (GNUNET_ERROR_TYPE_ERROR,
- "Received unexpected %u bytes of type %u from `%s'\n",
- (unsigned int) ntohs (message->size),
- (unsigned int) ntohs (message->type),
- GNUNET_a2s (vaddr,
- alen));
- GNUNET_break_op(0);
- GNUNET_SERVER_receive_done (client,
- GNUNET_SYSERR);
- GNUNET_free_non_null (vaddr);
- return;
- }
- if (GNUNET_YES == session->expecting_welcome)
- {
- /* Session is expecting WELCOME message */
- void *vaddr = NULL;
- size_t alen;
-
- GNUNET_SERVER_client_get_address (client,
- &vaddr,
- &alen);
- LOG (GNUNET_ERROR_TYPE_ERROR,
- "Received unexpected %u bytes of type %u from `%s'\n",
- (unsigned int) ntohs (message->size),
- (unsigned int) ntohs (message->type),
- GNUNET_a2s (vaddr, alen));
- GNUNET_break_op(0);
- GNUNET_SERVER_receive_done (client,
- GNUNET_SYSERR);
- GNUNET_free_non_null (vaddr);
- return;
- }
-
- session->last_activity = GNUNET_TIME_absolute_get ();
- {
- void *vaddr = NULL;
- size_t alen;
-
- GNUNET_SERVER_client_get_address (client,
- &vaddr,
- &alen);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Passing %u bytes of type %u from `%s' at %s to transport service.\n",
- (unsigned int) ntohs (message->size),
- (unsigned int) ntohs (message->type),
- GNUNET_i2s (&session->target),
- GNUNET_a2s (vaddr, alen));
- GNUNET_free_non_null (vaddr);
- }
-
- GNUNET_STATISTICS_update (plugin->env->stats,
- gettext_noop ("# bytes received via TCP"),
- ntohs (message->size),
- GNUNET_NO);
-
- GNUNET_assert (GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
- &session->target,
- session));
- delay = plugin->env->receive (plugin->env->cls,
- session->address,
- session,
- message);
- reschedule_session_timeout (session);
- if (0 == delay.rel_value_us)
- {
- GNUNET_SERVER_receive_done (client,
- GNUNET_OK);
- }
- else
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Throttling receiving from `%s' for %s\n",
- GNUNET_i2s (&session->target),
- GNUNET_STRINGS_relative_time_to_string (delay,
- GNUNET_YES));
- GNUNET_SERVER_disable_receive_done_warning (client);
- GNUNET_assert (NULL == session->receive_delay_task);
- session->receive_delay_task = GNUNET_SCHEDULER_add_delayed (delay,
- &delayed_done,
- session);
- }
-}
-
-
-/**
- * Function called whenever a peer is connected on the "SERVER" level.
- * Increments number of active connections and suspends server if we
- * have reached the limit.
- *
- * @param cls closure
- * @param client identification of the client
- */
-static void
-connect_notify (void *cls,
- struct GNUNET_SERVER_Client *client)
-{
- struct Plugin *plugin = cls;
-
- if (NULL == client)
- return;
- plugin->cur_connections++;
- GNUNET_STATISTICS_set (plugin->env->stats,
- gettext_noop ("# TCP server connections active"),
- plugin->cur_connections,
- GNUNET_NO);
- GNUNET_STATISTICS_update (plugin->env->stats,
- gettext_noop ("# TCP server connect events"),
- 1,
- GNUNET_NO);
- if (plugin->cur_connections != plugin->max_connections)
- return;
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("TCP connection limit reached, suspending server\n"));
- GNUNET_STATISTICS_update (plugin->env->stats,
- gettext_noop ("# TCP service suspended"),
- 1,
- GNUNET_NO);
- GNUNET_SERVER_suspend (plugin->server); /* Maximum number of connections rechead */
-}
-
-
-/**
- * Function called whenever a peer is disconnected on the "SERVER"
- * level. Cleans up the connection, decrements number of active
- * connections and if applicable resumes listening.
- *
- * @param cls closure
- * @param client identification of the client
- */
-static void
-disconnect_notify (void *cls,
- struct GNUNET_SERVER_Client *client)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session;
-
- if (NULL == client)
- return;
- GNUNET_assert (plugin->cur_connections >= 1);
- plugin->cur_connections--;
- session = lookup_session_by_client (plugin,
- client);
- if (NULL == session)
- return; /* unknown, nothing to do */
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Destroying session of `%s' with %s due to network-level disconnect.\n",
- GNUNET_i2s (&session->target),
- tcp_plugin_address_to_string (session->plugin,
- session->address->address,
- session->address->address_length));
-
- if (plugin->cur_connections == plugin->max_connections)
- {
- GNUNET_STATISTICS_update (session->plugin->env->stats,
- gettext_noop ("# TCP service resumed"),
- 1,
- GNUNET_NO);
- GNUNET_SERVER_resume (plugin->server); /* Resume server */
- }
- GNUNET_STATISTICS_set (plugin->env->stats,
- gettext_noop ("# TCP server connections active"),
- plugin->cur_connections,
- GNUNET_NO);
- GNUNET_STATISTICS_update (session->plugin->env->stats,
- gettext_noop ("# network-level TCP disconnect events"),
- 1,
- GNUNET_NO);
- tcp_plugin_disconnect_session (plugin,
- session);
-}
-
-
-/**
- * We can now send a probe message, copy into buffer to really send.
- *
- * @param cls closure, a `struct TCPProbeContext`
- * @param size max size to copy
- * @param buf buffer to copy message to
- * @return number of bytes copied into @a buf
- */
-static size_t
-notify_send_probe (void *cls,
- size_t size,
- void *buf)
-{
- struct TCPProbeContext *tcp_probe_ctx = cls;
- struct Plugin *plugin = tcp_probe_ctx->plugin;
- size_t ret;
-
- tcp_probe_ctx->transmit_handle = NULL;
- GNUNET_CONTAINER_DLL_remove (plugin->probe_head,
- plugin->probe_tail,
- tcp_probe_ctx);
- if (NULL == buf)
- {
- GNUNET_CONNECTION_destroy (tcp_probe_ctx->sock);
- GNUNET_free(tcp_probe_ctx);
- return 0;
- }
- GNUNET_assert(size >= sizeof(tcp_probe_ctx->message));
- GNUNET_memcpy (buf,
- &tcp_probe_ctx->message,
- sizeof(tcp_probe_ctx->message));
- GNUNET_SERVER_connect_socket (tcp_probe_ctx->plugin->server,
- tcp_probe_ctx->sock);
- ret = sizeof(tcp_probe_ctx->message);
- GNUNET_free (tcp_probe_ctx);
- return ret;
-}
-
-
-/**
- * Function called by the NAT subsystem suggesting another peer wants
- * to connect to us via connection reversal. Try to connect back to the
- * given IP.
- *
- * @param cls closure
- * @param addr address to try
- * @param addrlen number of bytes in @a addr
- */
-static void
-try_connection_reversal (void *cls,
- const struct sockaddr *addr,
- socklen_t addrlen)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_CONNECTION_Handle *sock;
- struct TCPProbeContext *tcp_probe_ctx;
-
- /**
- * We have received an ICMP response, ostensibly from a peer
- * that wants to connect to us! Send a message to establish a connection.
- */
- sock = GNUNET_CONNECTION_create_from_sockaddr (AF_INET,
- addr,
- addrlen);
- if (NULL == sock)
- {
- /* failed for some odd reason (out of sockets?); ignore attempt */
- return;
- }
-
- tcp_probe_ctx = GNUNET_new (struct TCPProbeContext);
- tcp_probe_ctx->message.header.size
- = htons (sizeof (struct TCP_NAT_ProbeMessage));
- tcp_probe_ctx->message.header.type
- = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE);
- tcp_probe_ctx->message.clientIdentity
- = *plugin->env->my_identity;
- tcp_probe_ctx->plugin = plugin;
- tcp_probe_ctx->sock = sock;
- GNUNET_CONTAINER_DLL_insert (plugin->probe_head,
- plugin->probe_tail,
- tcp_probe_ctx);
- tcp_probe_ctx->transmit_handle
- = GNUNET_CONNECTION_notify_transmit_ready (sock,
- ntohs (tcp_probe_ctx->message.header.size),
- GNUNET_TIME_UNIT_FOREVER_REL,
- ¬ify_send_probe,
- tcp_probe_ctx);
-}
-
-
-/**
- * Function obtain the network type for a session
- *
- * @param cls closure (`struct Plugin *`)
- * @param session the session
- * @return the network type in HBO or #GNUNET_SYSERR
- */
-static enum GNUNET_NetworkType
-tcp_plugin_get_network (void *cls,
- struct GNUNET_ATS_Session *session)
-{
- return session->scope;
-}
-
-
-/**
- * Function obtain the network type for an address.
- *
- * @param cls closure (`struct Plugin *`)
- * @param address the address
- * @return the network type
- */
-static enum GNUNET_NetworkType
-tcp_plugin_get_network_for_address (void *cls,
- const struct GNUNET_HELLO_Address *address)
-{
- struct Plugin *plugin = cls;
- size_t addrlen;
- struct sockaddr_in a4;
- struct sockaddr_in6 a6;
- const struct IPv4TcpAddress *t4;
- const struct IPv6TcpAddress *t6;
- const void *sb;
- size_t sbs;
-
- addrlen = address->address_length;
- if (addrlen == sizeof(struct IPv6TcpAddress))
- {
- GNUNET_assert (NULL != address->address); /* make static analysis happy */
- t6 = address->address;
- memset (&a6, 0, sizeof(a6));
-#if HAVE_SOCKADDR_IN_SIN_LEN
- a6.sin6_len = sizeof (a6);
-#endif
- a6.sin6_family = AF_INET6;
- a6.sin6_port = t6->t6_port;
- GNUNET_memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof(struct in6_addr));
- sb = &a6;
- sbs = sizeof(a6);
- }
- else if (addrlen == sizeof(struct IPv4TcpAddress))
- {
- GNUNET_assert (NULL != address->address); /* make static analysis happy */
- t4 = address->address;
- memset (&a4, 0, sizeof(a4));
-#if HAVE_SOCKADDR_IN_SIN_LEN
- a4.sin_len = sizeof (a4);
-#endif
- a4.sin_family = AF_INET;
- a4.sin_port = t4->t4_port;
- a4.sin_addr.s_addr = t4->ipv4_addr;
- sb = &a4;
- sbs = sizeof(a4);
- }
- else
- {
- GNUNET_break (0);
- return GNUNET_NT_UNSPECIFIED;
- }
- return plugin->env->get_address_type (plugin->env->cls,
- sb,
- sbs);
-}
-
-
-/**
- * Return information about the given session to the
- * monitor callback.
- *
- * @param cls the `struct Plugin` with the monitor callback (`sic`)
- * @param peer peer we send information about
- * @param value our `struct GNUNET_ATS_Session` to send information about
- * @return #GNUNET_OK (continue to iterate)
- */
-static int
-send_session_info_iter (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- void *value)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session = value;
-
- notify_session_monitor (plugin,
- session,
- GNUNET_TRANSPORT_SS_INIT);
- /* FIXME: cannot tell if this is up or not from current
- session state... */
- notify_session_monitor (plugin,
- session,
- GNUNET_TRANSPORT_SS_UP);
- return GNUNET_OK;
-}
-
-
-/**
- * Begin monitoring sessions of a plugin. There can only
- * be one active monitor per plugin (i.e. if there are
- * multiple monitors, the transport service needs to
- * multiplex the generated events over all of them).
- *
- * @param cls closure of the plugin
- * @param sic callback to invoke, NULL to disable monitor;
- * plugin will being by iterating over all active
- * sessions immediately and then enter monitor mode
- * @param sic_cls closure for @a sic
- */
-static void
-tcp_plugin_setup_monitor (void *cls,
- GNUNET_TRANSPORT_SessionInfoCallback sic,
- void *sic_cls)
-{
- struct Plugin *plugin = cls;
-
- plugin->sic = sic;
- plugin->sic_cls = sic_cls;
- if (NULL != sic)
- {
- GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
- &send_session_info_iter,
- plugin);
- /* signal end of first iteration */
- sic (sic_cls, NULL, NULL);
- }
-}
-
-
-/**
- * Entry point for the plugin.
- *
- * @param cls closure, the `struct GNUNET_TRANSPORT_PluginEnvironment *`
- * @return the `struct GNUNET_TRANSPORT_PluginFunctions *` or NULL on error
- */
-void *
-libgnunet_plugin_transport_xt_init (void *cls)
-{
- static const struct GNUNET_SERVER_MessageHandler my_handlers[] = {
- { &handle_tcp_welcome, NULL,
- GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME,
- sizeof(struct WelcomeMessage) },
- { &handle_tcp_nat_probe, NULL,
- GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE,
- sizeof(struct TCP_NAT_ProbeMessage) },
- { &handle_tcp_data, NULL,
- GNUNET_MESSAGE_TYPE_ALL, 0 },
- { NULL, NULL, 0, 0 }
- };
- struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
- struct GNUNET_TRANSPORT_PluginFunctions *api;
- struct Plugin *plugin;
- struct LEGACY_SERVICE_Context *service;
- unsigned long long aport;
- unsigned long long bport;
- unsigned long long max_connections;
- unsigned int i;
- struct GNUNET_TIME_Relative idle_timeout;
-#ifdef TCP_STEALTH
- struct GNUNET_NETWORK_Handle *const*lsocks;
-#endif
- int ret;
- int ret_s;
- struct sockaddr **addrs;
- socklen_t *addrlens;
-
- if (NULL == env->receive)
- {
- /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
- initialze the plugin or the API */
- api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
- api->cls = NULL;
- api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
- api->address_to_string = &tcp_plugin_address_to_string;
- api->string_to_address = &tcp_plugin_string_to_address;
- return api;
- }
-
- GNUNET_assert (NULL != env->cfg);
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (env->cfg,
- "transport-xt",
- "MAX_CONNECTIONS",
- &max_connections))
- max_connections = 128;
-
- aport = 0;
- if ((GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (env->cfg,
- "transport-xt",
- "PORT", &bport)) ||
- (bport > 65535) ||
- ((GNUNET_OK ==
- GNUNET_CONFIGURATION_get_value_number (env->cfg,
- "transport-xt",
- "ADVERTISED-PORT", &aport)) &&
- (aport > 65535) ))
- {
- LOG(GNUNET_ERROR_TYPE_ERROR,
- _("Require valid port number for service `%s' in configuration!\n"),
- "transport-xt");
- return NULL ;
- }
- if (0 == aport)
- aport = bport;
- if (0 == bport)
- aport = 0;
- if (0 != bport)
- {
- service = LEGACY_SERVICE_start ("transport-xt",
- env->cfg,
- LEGACY_SERVICE_OPTION_NONE);
- if (NULL == service)
- {
- LOG (GNUNET_ERROR_TYPE_WARNING,
- _("Failed to start service.\n"));
- return NULL;
- }
- }
- else
- service = NULL;
-
- api = NULL;
- plugin = GNUNET_new (struct Plugin);
- plugin->sessionmap = GNUNET_CONTAINER_multipeermap_create (max_connections,
- GNUNET_YES);
- plugin->max_connections = max_connections;
- plugin->open_port = bport;
- plugin->adv_port = aport;
- plugin->env = env;
- plugin->my_welcome.header.size = htons (sizeof(struct WelcomeMessage));
- plugin->my_welcome.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME);
- plugin->my_welcome.clientIdentity = *plugin->env->my_identity;
-
- if ( (NULL != service) &&
- (GNUNET_YES ==
- GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
- "transport-xt",
- "TCP_STEALTH")) )
- {
-#ifdef TCP_STEALTH
- plugin->myoptions |= TCP_OPTIONS_TCP_STEALTH;
- lsocks = LEGACY_SERVICE_get_listen_sockets (service);
- if (NULL != lsocks)
- {
- uint32_t len = sizeof (struct WelcomeMessage);
-
- for (i=0;NULL!=lsocks[i];i++)
- {
- if ( (GNUNET_OK !=
- GNUNET_NETWORK_socket_setsockopt (lsocks[i],
- IPPROTO_TCP,
- TCP_STEALTH,
- env->my_identity,
- sizeof (struct GNUNET_PeerIdentity))) ||
- (GNUNET_OK !=
- GNUNET_NETWORK_socket_setsockopt (lsocks[i],
- IPPROTO_TCP,
- TCP_STEALTH_INTEGRITY_LEN,
- &len,
- sizeof (len))) )
- {
- /* TCP STEALTH not supported by kernel */
- GNUNET_assert (0 == i);
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("TCP_STEALTH not supported on this platform.\n"));
- goto die;
- }
- }
- }
-#else
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("TCP_STEALTH not supported on this platform.\n"));
- goto die;
-#endif
- }
-
- if ( (NULL != service) &&
- (GNUNET_SYSERR !=
- (ret_s =
- get_server_addresses ("transport-xt",
- env->cfg,
- &addrs,
- &addrlens))))
- {
- for (ret = ret_s-1; ret >= 0; ret--)
- LOG (GNUNET_ERROR_TYPE_INFO,
- "Binding to address `%s'\n",
- GNUNET_a2s (addrs[ret], addrlens[ret]));
- plugin->nat
- = GNUNET_NAT_register (env->cfg,
- "transport-xt",
- IPPROTO_TCP,
- (unsigned int) ret_s,
- (const struct sockaddr **) addrs,
- addrlens,
- &tcp_nat_port_map_callback,
- &try_connection_reversal,
- plugin);
- for (ret = ret_s -1; ret >= 0; ret--)
- GNUNET_free (addrs[ret]);
- GNUNET_free_non_null (addrs);
- GNUNET_free_non_null (addrlens);
- }
- else
- {
- plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
- "transport-xt",
- IPPROTO_TCP,
- 0,
- NULL,
- NULL,
- NULL,
- &try_connection_reversal,
- plugin);
- }
- api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
- api->cls = plugin;
- api->send = &tcp_plugin_send;
- api->get_session = &tcp_plugin_get_session;
- api->disconnect_session = &tcp_plugin_disconnect_session;
- api->query_keepalive_factor = &tcp_plugin_query_keepalive_factor;
- api->disconnect_peer = &tcp_plugin_disconnect;
- api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
- api->check_address = &tcp_plugin_check_address;
- api->address_to_string = &tcp_plugin_address_to_string;
- api->string_to_address = &tcp_plugin_string_to_address;
- api->get_network = &tcp_plugin_get_network;
- api->get_network_for_address = &tcp_plugin_get_network_for_address;
- api->update_session_timeout = &tcp_plugin_update_session_timeout;
- api->update_inbound_delay = &tcp_plugin_update_inbound_delay;
- api->setup_monitor = &tcp_plugin_setup_monitor;
- plugin->service = service;
- if (NULL != service)
- {
- plugin->server = LEGACY_SERVICE_get_server (service);
- }
- else
- {
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_time (env->cfg,
- "transport-xt",
- "TIMEOUT",
- &idle_timeout))
- {
- GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
- "transport-xt",
- "TIMEOUT");
- goto die;
- }
- plugin->server
- = GNUNET_SERVER_create_with_sockets (NULL,
- plugin,
- NULL,
- idle_timeout,
- GNUNET_YES);
- }
- plugin->handlers = GNUNET_malloc (sizeof (my_handlers));
- GNUNET_memcpy (plugin->handlers,
- my_handlers,
- sizeof(my_handlers));
- for (i = 0;i < sizeof(my_handlers) / sizeof(struct GNUNET_SERVER_MessageHandler);i++)
- plugin->handlers[i].callback_cls = plugin;
-
- GNUNET_SERVER_add_handlers (plugin->server,
- plugin->handlers);
- GNUNET_SERVER_connect_notify (plugin->server,
- &connect_notify,
- plugin);
- GNUNET_SERVER_disconnect_notify (plugin->server,
- &disconnect_notify,
- plugin);
- plugin->nat_wait_conns = GNUNET_CONTAINER_multipeermap_create (16,
- GNUNET_YES);
- if (0 != bport)
- LOG (GNUNET_ERROR_TYPE_INFO,
- _("XT transport listening on port %llu\n"),
- bport);
- else
- LOG (GNUNET_ERROR_TYPE_INFO,
- _("XT transport not listening on any port (client only)\n"));
- if ( (aport != bport) &&
- (0 != bport) )
- LOG (GNUNET_ERROR_TYPE_INFO,
- _("XT transport advertises itself as being on port %llu\n"),
- aport);
- /* Initially set connections to 0 */
- GNUNET_STATISTICS_set (plugin->env->stats,
- gettext_noop ("# XT sessions active"),
- 0,
- GNUNET_NO);
- return api;
-
- die:
- if (NULL != plugin->nat)
- GNUNET_NAT_unregister (plugin->nat);
- GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap);
- if (NULL != service)
- LEGACY_SERVICE_stop (service);
- GNUNET_free (plugin);
- GNUNET_free_non_null (api);
- return NULL;
-}
-
-
-/**
- * Exit point from the plugin.
- *
- * @param cls the `struct GNUNET_TRANSPORT_PluginFunctions`
- * @return NULL
- */
-void *
-libgnunet_plugin_transport_xt_done (void *cls)
-{
- struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
- struct Plugin *plugin = api->cls;
- struct TCPProbeContext *tcp_probe;
- struct PrettyPrinterContext *cur;
- struct PrettyPrinterContext *next;
-
- if (NULL == plugin)
- {
- GNUNET_free(api);
- return NULL ;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Shutting down XT plugin\n");
-
- /* Removing leftover sessions */
- GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
- &session_disconnect_it,
- plugin);
- /* Removing leftover NAT sessions */
- GNUNET_CONTAINER_multipeermap_iterate (plugin->nat_wait_conns,
- &session_disconnect_it,
- plugin);
-
- for (cur = plugin->ppc_dll_head; NULL != cur; cur = next)
- {
- next = cur->next;
- GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
- plugin->ppc_dll_tail,
- cur);
- GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
- cur->asc (cur->asc_cls,
- NULL,
- GNUNET_OK);
- GNUNET_free (cur);
- }
-
- if (NULL != plugin->service)
- LEGACY_SERVICE_stop (plugin->service);
- else
- GNUNET_SERVER_destroy (plugin->server);
- GNUNET_free (plugin->handlers);
- if (NULL != plugin->nat)
- GNUNET_NAT_unregister (plugin->nat);
- while (NULL != (tcp_probe = plugin->probe_head))
- {
- GNUNET_CONTAINER_DLL_remove (plugin->probe_head,
- plugin->probe_tail,
- tcp_probe);
- GNUNET_CONNECTION_destroy (tcp_probe->sock);
- GNUNET_free (tcp_probe);
- }
- GNUNET_CONTAINER_multipeermap_destroy (plugin->nat_wait_conns);
- GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap);
- GNUNET_break (0 == plugin->cur_connections);
- GNUNET_free (plugin);
- GNUNET_free (api);
- return NULL;
-}
-
-/* end of plugin_transport_xt.c */
+++ /dev/null
-/*
- This file is part of GNUnet
- Copyright (C) 2010-2017 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
- */
-
-/**
- * @file transport/plugin_transport_xu.c
- * @brief Implementation of the XU transport protocol
- * @author Christian Grothoff
- * @author Nathan Evans
- * @author Matthias Wachs
- */
-#include "platform.h"
-#include "plugin_transport_xu.h"
-#include "gnunet_hello_lib.h"
-#include "gnunet_util_lib.h"
-#include "gnunet_fragmentation_lib.h"
-#include "gnunet_nat_service.h"
-#include "gnunet_protocols.h"
-#include "gnunet_resolver_service.h"
-#include "gnunet_signatures.h"
-#include "gnunet_constants.h"
-#include "gnunet_statistics_service.h"
-#include "gnunet_transport_service.h"
-#include "gnunet_transport_plugin.h"
-#include "transport.h"
-
-#define LOG(kind,...) GNUNET_log_from (kind, "transport-xu", __VA_ARGS__)
-
-/**
- * After how much inactivity should a XU session time out?
- */
-#define XU_SESSION_TIME_OUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60)
-
-
-/**
- * XU Message-Packet header (after defragmentation).
- */
-struct XUMessage
-{
- /**
- * Message header.
- */
- struct GNUNET_MessageHeader header;
-
- /**
- * Always zero for now.
- */
- uint32_t reserved;
-
- /**
- * What is the identity of the sender
- */
- struct GNUNET_PeerIdentity sender;
-
-};
-
-
-/**
- * Closure for #append_port().
- */
-struct PrettyPrinterContext
-{
- /**
- * DLL
- */
- struct PrettyPrinterContext *next;
-
- /**
- * DLL
- */
- struct PrettyPrinterContext *prev;
-
- /**
- * Our plugin.
- */
- struct Plugin *plugin;
-
- /**
- * Resolver handle
- */
- struct GNUNET_RESOLVER_RequestHandle *resolver_handle;
-
- /**
- * Function to call with the result.
- */
- GNUNET_TRANSPORT_AddressStringCallback asc;
-
- /**
- * Clsoure for @e asc.
- */
- void *asc_cls;
-
- /**
- * Timeout task
- */
- struct GNUNET_SCHEDULER_Task *timeout_task;
-
- /**
- * Is this an IPv6 address?
- */
- int ipv6;
-
- /**
- * Options
- */
- uint32_t options;
-
- /**
- * Port to add after the IP address.
- */
- uint16_t port;
-
-};
-
-
-/**
- * Session with another peer.
- */
-struct GNUNET_ATS_Session
-{
- /**
- * Which peer is this session for?
- */
- struct GNUNET_PeerIdentity target;
-
- /**
- * Tokenizer for inbound messages.
- */
- struct GNUNET_MessageStreamTokenizer *mst;
-
- /**
- * Plugin this session belongs to.
- */
- struct Plugin *plugin;
-
- /**
- * Session timeout task
- */
- struct GNUNET_SCHEDULER_Task *timeout_task;
-
- /**
- * When does this session time out?
- */
- struct GNUNET_TIME_Absolute timeout;
-
- /**
- * What time did we last transmit?
- */
- struct GNUNET_TIME_Absolute last_transmit_time;
-
- /**
- * expected delay for ACKs
- */
- struct GNUNET_TIME_Relative last_expected_ack_delay;
-
- /**
- * desired delay between XU messages
- */
- struct GNUNET_TIME_Relative last_expected_msg_delay;
-
- /**
- */
- struct GNUNET_TIME_Relative flow_delay_for_other_peer;
- struct GNUNET_TIME_Relative flow_delay_from_other_peer;
-
- /**
- * Our own address.
- */
- struct GNUNET_HELLO_Address *address;
-
- /**
- * Number of bytes waiting for transmission to this peer.
- */
- unsigned long long bytes_in_queue;
-
- /**
- * Number of messages waiting for transmission to this peer.
- */
- unsigned int msgs_in_queue;
-
- /**
- * Reference counter to indicate that this session is
- * currently being used and must not be destroyed;
- * setting @e in_destroy will destroy it as soon as
- * possible.
- */
- unsigned int rc;
-
- /**
- * Network type of the address.
- */
- enum GNUNET_NetworkType scope;
-
- /**
- * Is this session about to be destroyed (sometimes we cannot
- * destroy a session immediately as below us on the stack
- * there might be code that still uses it; in this case,
- * @e rc is non-zero).
- */
- int in_destroy;
-};
-
-
-
-/**
- * If a session monitor is attached, notify it about the new
- * session state.
- *
- * @param plugin our plugin
- * @param session session that changed state
- * @param state new state of the session
- */
-static void
-notify_session_monitor (struct Plugin *plugin,
- struct GNUNET_ATS_Session *session,
- enum GNUNET_TRANSPORT_SessionState state)
-{
- struct GNUNET_TRANSPORT_SessionInfo info;
-
- if (NULL == plugin->sic)
- return;
- if (GNUNET_YES == session->in_destroy)
- return; /* already destroyed, just RC>0 left-over actions */
- memset (&info,
- 0,
- sizeof (info));
- info.state = state;
- info.is_inbound = GNUNET_SYSERR; /* hard to say */
- info.num_msg_pending = session->msgs_in_queue;
- info.num_bytes_pending = session->bytes_in_queue;
- /* info.receive_delay remains zero as this is not supported by XU
- (cannot selectively not receive from 'some' peer while continuing
- to receive from others) */
- info.session_timeout = session->timeout;
- info.address = session->address;
- plugin->sic (plugin->sic_cls,
- session,
- &info);
-}
-
-
-/**
- * Return information about the given session to the monitor callback.
- *
- * @param cls the `struct Plugin` with the monitor callback (`sic`)
- * @param peer peer we send information about
- * @param value our `struct GNUNET_ATS_Session` to send information about
- * @return #GNUNET_OK (continue to iterate)
- */
-static int
-send_session_info_iter (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- void *value)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session = value;
-
- (void) peer;
- notify_session_monitor (plugin,
- session,
- GNUNET_TRANSPORT_SS_INIT);
- notify_session_monitor (plugin,
- session,
- GNUNET_TRANSPORT_SS_UP);
- return GNUNET_OK;
-}
-
-
-/**
- * Begin monitoring sessions of a plugin. There can only
- * be one active monitor per plugin (i.e. if there are
- * multiple monitors, the transport service needs to
- * multiplex the generated events over all of them).
- *
- * @param cls closure of the plugin
- * @param sic callback to invoke, NULL to disable monitor;
- * plugin will being by iterating over all active
- * sessions immediately and then enter monitor mode
- * @param sic_cls closure for @a sic
- */
-static void
-xu_plugin_setup_monitor (void *cls,
- GNUNET_TRANSPORT_SessionInfoCallback sic,
- void *sic_cls)
-{
- struct Plugin *plugin = cls;
-
- plugin->sic = sic;
- plugin->sic_cls = sic_cls;
- if (NULL != sic)
- {
- GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
- &send_session_info_iter,
- plugin);
- /* signal end of first iteration */
- sic (sic_cls,
- NULL,
- NULL);
- }
-}
-
-
-/* ****************** Little Helpers ****************** */
-
-
-/**
- * Function to free last resources associated with a session.
- *
- * @param s session to free
- */
-static void
-free_session (struct GNUNET_ATS_Session *s)
-{
- if (NULL != s->address)
- {
- GNUNET_HELLO_address_free (s->address);
- s->address = NULL;
- }
- if (NULL != s->mst)
- {
- GNUNET_MST_destroy (s->mst);
- s->mst = NULL;
- }
- GNUNET_free (s);
-}
-
-
-/**
- * Function that is called to get the keepalive factor.
- * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
- * calculate the interval between keepalive packets.
- *
- * @param cls closure with the `struct Plugin`
- * @return keepalive factor
- */
-static unsigned int
-xu_query_keepalive_factor (void *cls)
-{
- (void) cls;
- return 15;
-}
-
-
-/**
- * Function obtain the network type for a session
- *
- * @param cls closure (`struct Plugin *`)
- * @param session the session
- * @return the network type
- */
-static enum GNUNET_NetworkType
-xu_plugin_get_network (void *cls,
- struct GNUNET_ATS_Session *session)
-{
- (void) cls;
- return session->scope;
-}
-
-
-/**
- * Function obtain the network type for an address.
- *
- * @param cls closure (`struct Plugin *`)
- * @param address the address
- * @return the network type
- */
-static enum GNUNET_NetworkType
-xu_plugin_get_network_for_address (void *cls,
- const struct GNUNET_HELLO_Address *address)
-{
- struct Plugin *plugin = cls;
- size_t addrlen;
- struct sockaddr_in a4;
- struct sockaddr_in6 a6;
- const struct IPv4XuAddress *u4;
- const struct IPv6XuAddress *u6;
- const void *sb;
- size_t sbs;
-
- addrlen = address->address_length;
- if (addrlen == sizeof(struct IPv6XuAddress))
- {
- GNUNET_assert (NULL != address->address); /* make static analysis happy */
- u6 = address->address;
- memset (&a6, 0, sizeof(a6));
-#if HAVE_SOCKADDR_IN_SIN_LEN
- a6.sin6_len = sizeof (a6);
-#endif
- a6.sin6_family = AF_INET6;
- a6.sin6_port = u6->u6_port;
- GNUNET_memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof(struct in6_addr));
- sb = &a6;
- sbs = sizeof(a6);
- }
- else if (addrlen == sizeof(struct IPv4XuAddress))
- {
- GNUNET_assert (NULL != address->address); /* make static analysis happy */
- u4 = address->address;
- memset (&a4, 0, sizeof(a4));
-#if HAVE_SOCKADDR_IN_SIN_LEN
- a4.sin_len = sizeof (a4);
-#endif
- a4.sin_family = AF_INET;
- a4.sin_port = u4->u4_port;
- a4.sin_addr.s_addr = u4->ipv4_addr;
- sb = &a4;
- sbs = sizeof(a4);
- }
- else
- {
- GNUNET_break (0);
- return GNUNET_NT_UNSPECIFIED;
- }
- return plugin->env->get_address_type (plugin->env->cls,
- sb,
- sbs);
-}
-
-
-/* ******************* Event loop ******************** */
-
-/**
- * We have been notified that our readset has something to read. We don't
- * know which socket needs to be read, so we have to check each one
- * Then reschedule this function to be called again once more is available.
- *
- * @param cls the plugin handle
- */
-static void
-xu_plugin_select_v4 (void *cls);
-
-
-/**
- * We have been notified that our readset has something to read. We don't
- * know which socket needs to be read, so we have to check each one
- * Then reschedule this function to be called again once more is available.
- *
- * @param cls the plugin handle
- */
-static void
-xu_plugin_select_v6 (void *cls);
-
-
-/**
- * (re)schedule IPv4-select tasks for this plugin.
- *
- * @param plugin plugin to reschedule
- */
-static void
-schedule_select_v4 (struct Plugin *plugin)
-{
- if ( (GNUNET_YES != plugin->enable_ipv4) ||
- (NULL == plugin->sockv4) )
- return;
- if (NULL != plugin->select_task_v4)
- GNUNET_SCHEDULER_cancel (plugin->select_task_v4);
- plugin->select_task_v4
- = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
- plugin->sockv4,
- &xu_plugin_select_v4,
- plugin);
-}
-
-
-/**
- * (re)schedule IPv6-select tasks for this plugin.
- *
- * @param plugin plugin to reschedule
- */
-static void
-schedule_select_v6 (struct Plugin *plugin)
-{
- if ( (GNUNET_YES != plugin->enable_ipv6) ||
- (NULL == plugin->sockv6) )
- return;
- if (NULL != plugin->select_task_v6)
- GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
- plugin->select_task_v6
- = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
- plugin->sockv6,
- &xu_plugin_select_v6,
- plugin);
-}
-
-
-/* ******************* Address to string and back ***************** */
-
-
-/**
- * Function called for a quick conversion of the binary address to
- * a numeric address. Note that the caller must not free the
- * address and that the next call to this function is allowed
- * to override the address again.
- *
- * @param cls closure
- * @param addr binary address (a `union XuAddress`)
- * @param addrlen length of the @a addr
- * @return string representing the same address
- */
-const char *
-xu_address_to_string (void *cls,
- const void *addr,
- size_t addrlen)
-{
- static char rbuf[INET6_ADDRSTRLEN + 10];
- char buf[INET6_ADDRSTRLEN];
- const void *sb;
- struct in_addr a4;
- struct in6_addr a6;
- const struct IPv4XuAddress *t4;
- const struct IPv6XuAddress *t6;
- int af;
- uint16_t port;
- uint32_t options;
-
- (void) cls;
- if (NULL == addr)
- {
- GNUNET_break_op (0);
- return NULL;
- }
-
- if (addrlen == sizeof(struct IPv6XuAddress))
- {
- t6 = addr;
- af = AF_INET6;
- options = ntohl (t6->options);
- port = ntohs (t6->u6_port);
- a6 = t6->ipv6_addr;
- sb = &a6;
- }
- else if (addrlen == sizeof(struct IPv4XuAddress))
- {
- t4 = addr;
- af = AF_INET;
- options = ntohl (t4->options);
- port = ntohs (t4->u4_port);
- a4.s_addr = t4->ipv4_addr;
- sb = &a4;
- }
- else
- {
- GNUNET_break_op (0);
- return NULL;
- }
- inet_ntop (af,
- sb,
- buf,
- INET6_ADDRSTRLEN);
- GNUNET_snprintf (rbuf,
- sizeof(rbuf),
- (af == AF_INET6)
- ? "%s.%u.[%s]:%u"
- : "%s.%u.%s:%u",
- PLUGIN_NAME,
- options,
- buf,
- port);
- return rbuf;
-}
-
-
-/**
- * Function called to convert a string address to a binary address.
- *
- * @param cls closure (`struct Plugin *`)
- * @param addr string address
- * @param addrlen length of the address
- * @param buf location to store the buffer
- * @param added location to store the number of bytes in the buffer.
- * If the function returns #GNUNET_SYSERR, its contents are undefined.
- * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
- */
-static int
-xu_string_to_address (void *cls,
- const char *addr,
- uint16_t addrlen,
- void **buf,
- size_t *added)
-{
- struct sockaddr_storage socket_address;
- char *address;
- char *plugin;
- char *optionstr;
- uint32_t options;
-
- (void) cls;
- /* Format tcp.options.address:port */
- address = NULL;
- plugin = NULL;
- optionstr = NULL;
-
- if ((NULL == addr) || (0 == addrlen))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- if ('\0' != addr[addrlen - 1])
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- if (strlen (addr) + 1 != (size_t) addrlen)
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- plugin = GNUNET_strdup (addr);
- optionstr = strchr (plugin, '.');
- if (NULL == optionstr)
- {
- GNUNET_break (0);
- GNUNET_free (plugin);
- return GNUNET_SYSERR;
- }
- optionstr[0] = '\0';
- optionstr++;
- options = atol (optionstr);
- address = strchr (optionstr, '.');
- if (NULL == address)
- {
- GNUNET_break (0);
- GNUNET_free (plugin);
- return GNUNET_SYSERR;
- }
- address[0] = '\0';
- address++;
-
- if (GNUNET_OK !=
- GNUNET_STRINGS_to_address_ip (address,
- strlen (address),
- &socket_address))
- {
- GNUNET_break (0);
- GNUNET_free (plugin);
- return GNUNET_SYSERR;
- }
- GNUNET_free(plugin);
-
- switch (socket_address.ss_family)
- {
- case AF_INET:
- {
- struct IPv4XuAddress *u4;
- const struct sockaddr_in *in4 = (const struct sockaddr_in *) &socket_address;
-
- u4 = GNUNET_new (struct IPv4XuAddress);
- u4->options = htonl (options);
- u4->ipv4_addr = in4->sin_addr.s_addr;
- u4->u4_port = in4->sin_port;
- *buf = u4;
- *added = sizeof (struct IPv4XuAddress);
- return GNUNET_OK;
- }
- case AF_INET6:
- {
- struct IPv6XuAddress *u6;
- const struct sockaddr_in6 *in6 = (const struct sockaddr_in6 *) &socket_address;
-
- u6 = GNUNET_new (struct IPv6XuAddress);
- u6->options = htonl (options);
- u6->ipv6_addr = in6->sin6_addr;
- u6->u6_port = in6->sin6_port;
- *buf = u6;
- *added = sizeof (struct IPv6XuAddress);
- return GNUNET_OK;
- }
- default:
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
-}
-
-
-/**
- * Append our port and forward the result.
- *
- * @param cls a `struct PrettyPrinterContext *`
- * @param hostname result from DNS resolver
- */
-static void
-append_port (void *cls,
- const char *hostname)
-{
- struct PrettyPrinterContext *ppc = cls;
- struct Plugin *plugin = ppc->plugin;
- char *ret;
-
- if (NULL == hostname)
- {
- /* Final call, done */
- GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
- plugin->ppc_dll_tail,
- ppc);
- ppc->resolver_handle = NULL;
- ppc->asc (ppc->asc_cls,
- NULL,
- GNUNET_OK);
- GNUNET_free (ppc);
- return;
- }
- if (GNUNET_YES == ppc->ipv6)
- GNUNET_asprintf (&ret,
- "%s.%u.[%s]:%d",
- PLUGIN_NAME,
- ppc->options,
- hostname,
- ppc->port);
- else
- GNUNET_asprintf (&ret,
- "%s.%u.%s:%d",
- PLUGIN_NAME,
- ppc->options,
- hostname,
- ppc->port);
- ppc->asc (ppc->asc_cls,
- ret,
- GNUNET_OK);
- GNUNET_free (ret);
-}
-
-
-/**
- * Convert the transports address to a nice, human-readable format.
- *
- * @param cls closure with the `struct Plugin *`
- * @param type name of the transport that generated the address
- * @param addr one of the addresses of the host, NULL for the last address
- * the specific address format depends on the transport;
- * a `union XuAddress`
- * @param addrlen length of the address
- * @param numeric should (IP) addresses be displayed in numeric form?
- * @param timeout after how long should we give up?
- * @param asc function to call on each string
- * @param asc_cls closure for @a asc
- */
-static void
-xu_plugin_address_pretty_printer (void *cls,
- const char *type,
- const void *addr,
- size_t addrlen,
- int numeric,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_TRANSPORT_AddressStringCallback asc,
- void *asc_cls)
-{
- struct Plugin *plugin = cls;
- struct PrettyPrinterContext *ppc;
- const struct sockaddr *sb;
- size_t sbs;
- struct sockaddr_in a4;
- struct sockaddr_in6 a6;
- const struct IPv4XuAddress *u4;
- const struct IPv6XuAddress *u6;
- uint16_t port;
- uint32_t options;
-
- (void) type;
- if (addrlen == sizeof(struct IPv6XuAddress))
- {
- u6 = addr;
- memset (&a6,
- 0,
- sizeof (a6));
- a6.sin6_family = AF_INET6;
-#if HAVE_SOCKADDR_IN_SIN_LEN
- a6.sin6_len = sizeof (a6);
-#endif
- a6.sin6_port = u6->u6_port;
- a6.sin6_addr = u6->ipv6_addr;
- port = ntohs (u6->u6_port);
- options = ntohl (u6->options);
- sb = (const struct sockaddr *) &a6;
- sbs = sizeof (a6);
- }
- else if (addrlen == sizeof (struct IPv4XuAddress))
- {
- u4 = addr;
- memset (&a4,
- 0,
- sizeof(a4));
- a4.sin_family = AF_INET;
-#if HAVE_SOCKADDR_IN_SIN_LEN
- a4.sin_len = sizeof (a4);
-#endif
- a4.sin_port = u4->u4_port;
- a4.sin_addr.s_addr = u4->ipv4_addr;
- port = ntohs (u4->u4_port);
- options = ntohl (u4->options);
- sb = (const struct sockaddr *) &a4;
- sbs = sizeof(a4);
- }
- else
- {
- /* invalid address */
- GNUNET_break_op (0);
- asc (asc_cls,
- NULL,
- GNUNET_SYSERR);
- asc (asc_cls,
- NULL,
- GNUNET_OK);
- return;
- }
- ppc = GNUNET_new (struct PrettyPrinterContext);
- ppc->plugin = plugin;
- ppc->asc = asc;
- ppc->asc_cls = asc_cls;
- ppc->port = port;
- ppc->options = options;
- if (addrlen == sizeof (struct IPv6XuAddress))
- ppc->ipv6 = GNUNET_YES;
- else
- ppc->ipv6 = GNUNET_NO;
- GNUNET_CONTAINER_DLL_insert (plugin->ppc_dll_head,
- plugin->ppc_dll_tail,
- ppc);
- ppc->resolver_handle
- = GNUNET_RESOLVER_hostname_get (sb,
- sbs,
- ! numeric,
- timeout,
- &append_port,
- ppc);
-}
-
-
-/**
- * Check if the given port is plausible (must be either our listen
- * port or our advertised port). If it is neither, we return
- * #GNUNET_SYSERR.
- *
- * @param plugin global variables
- * @param in_port port number to check
- * @return #GNUNET_OK if port is either our open or advertised port
- */
-static int
-check_port (const struct Plugin *plugin,
- uint16_t in_port)
-{
- if ( (plugin->port == in_port) ||
- (plugin->aport == in_port) )
- return GNUNET_OK;
- return GNUNET_SYSERR;
-}
-
-
-/**
- * Function that will be called to check if a binary address for this
- * plugin is well-formed and corresponds to an address for THIS peer
- * (as per our configuration). Naturally, if absolutely necessary,
- * plugins can be a bit conservative in their answer, but in general
- * plugins should make sure that the address does not redirect
- * traffic to a 3rd party that might try to man-in-the-middle our
- * traffic.
- *
- * @param cls closure, should be our handle to the Plugin
- * @param addr pointer to a `union XuAddress`
- * @param addrlen length of @a addr
- * @return #GNUNET_OK if this is a plausible address for this peer
- * and transport, #GNUNET_SYSERR if not
- */
-static int
-xu_plugin_check_address (void *cls,
- const void *addr,
- size_t addrlen)
-{
- struct Plugin *plugin = cls;
- const struct IPv4XuAddress *v4;
- const struct IPv6XuAddress *v6;
-
- if (sizeof(struct IPv4XuAddress) == addrlen)
- {
- struct sockaddr_in s4;
-
- v4 = (const struct IPv4XuAddress *) addr;
- if (GNUNET_OK != check_port (plugin,
- ntohs (v4->u4_port)))
- return GNUNET_SYSERR;
- memset (&s4, 0, sizeof (s4));
- s4.sin_family = AF_INET;
-#if HAVE_SOCKADDR_IN_SIN_LEN
- s4.sin_len = sizeof (s4);
-#endif
- s4.sin_port = v4->u4_port;
- s4.sin_addr.s_addr = v4->ipv4_addr;
-
- if (GNUNET_OK !=
- GNUNET_NAT_test_address (plugin->nat,
- &s4,
- sizeof (struct sockaddr_in)))
- return GNUNET_SYSERR;
- }
- else if (sizeof(struct IPv6XuAddress) == addrlen)
- {
- struct sockaddr_in6 s6;
-
- v6 = (const struct IPv6XuAddress *) addr;
- if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
- return GNUNET_OK; /* plausible, if unlikely... */
- memset (&s6, 0, sizeof (s6));
- s6.sin6_family = AF_INET6;
-#if HAVE_SOCKADDR_IN_SIN_LEN
- s6.sin6_len = sizeof (s6);
-#endif
- s6.sin6_port = v6->u6_port;
- s6.sin6_addr = v6->ipv6_addr;
-
- if (GNUNET_OK !=
- GNUNET_NAT_test_address (plugin->nat,
- &s6,
- sizeof(struct sockaddr_in6)))
- return GNUNET_SYSERR;
- }
- else
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
-}
-
-
-/**
- * Our external IP address/port mapping has changed.
- *
- * @param cls closure, the `struct Plugin`
- * @param add_remove #GNUNET_YES to mean the new public IP address,
- * #GNUNET_NO to mean the previous (now invalid) one
- * @param ac address class the address belongs to
- * @param addr either the previous or the new public IP address
- * @param addrlen actual length of the @a addr
- */
-static void
-xu_nat_port_map_callback (void *cls,
- int add_remove,
- enum GNUNET_NAT_AddressClass ac,
- const struct sockaddr *addr,
- socklen_t addrlen)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_HELLO_Address *address;
- struct IPv4XuAddress u4;
- struct IPv6XuAddress u6;
- void *arg;
- size_t args;
-
- if (GNUNET_NAT_AC_LOOPBACK == ac)
- return;
- if (GNUNET_NAT_AC_LAN == ac)
- return;
- if (GNUNET_NAT_AC_LAN_PRIVATE == ac)
- return;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- (GNUNET_YES == add_remove)
- ? "NAT notification to add address `%s'\n"
- : "NAT notification to remove address `%s'\n",
- GNUNET_a2s (addr,
- addrlen));
- /* convert 'address' to our internal format */
- switch (addr->sa_family)
- {
- case AF_INET:
- {
- const struct sockaddr_in *i4;
-
- GNUNET_assert (sizeof(struct sockaddr_in) == addrlen);
- i4 = (const struct sockaddr_in *) addr;
- if (0 == ntohs (i4->sin_port))
- return; /* Port = 0 means unmapped, ignore these for XU. */
- memset (&u4,
- 0,
- sizeof(u4));
- u4.options = htonl (plugin->myoptions);
- u4.ipv4_addr = i4->sin_addr.s_addr;
- u4.u4_port = i4->sin_port;
- arg = &u4;
- args = sizeof (struct IPv4XuAddress);
- break;
- }
- case AF_INET6:
- {
- const struct sockaddr_in6 *i6;
-
- GNUNET_assert (sizeof(struct sockaddr_in6) == addrlen);
- i6 = (const struct sockaddr_in6 *) addr;
- if (0 == ntohs (i6->sin6_port))
- return; /* Port = 0 means unmapped, ignore these for XU. */
- memset (&u6,
- 0,
- sizeof(u6));
- u6.options = htonl (plugin->myoptions);
- u6.ipv6_addr = i6->sin6_addr;
- u6.u6_port = i6->sin6_port;
- arg = &u6;
- args = sizeof (struct IPv6XuAddress);
- break;
- }
- default:
- GNUNET_break (0);
- return;
- }
- /* modify our published address list */
- /* TODO: use 'ac' here in the future... */
- address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
- PLUGIN_NAME,
- arg,
- args,
- GNUNET_HELLO_ADDRESS_INFO_NONE);
- plugin->env->notify_address (plugin->env->cls,
- add_remove,
- address);
- GNUNET_HELLO_address_free (address);
-}
-
-
-/* ********************* Finding sessions ******************* */
-
-
-/**
- * Closure for #session_cmp_it().
- */
-struct GNUNET_ATS_SessionCompareContext
-{
- /**
- * Set to session matching the address.
- */
- struct GNUNET_ATS_Session *res;
-
- /**
- * Address we are looking for.
- */
- const struct GNUNET_HELLO_Address *address;
-};
-
-
-/**
- * Find a session with a matching address.
- *
- * @param cls the `struct GNUNET_ATS_SessionCompareContext *`
- * @param key peer identity (unused)
- * @param value the `struct GNUNET_ATS_Session *`
- * @return #GNUNET_NO if we found the session, #GNUNET_OK if not
- */
-static int
-session_cmp_it (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
-{
- struct GNUNET_ATS_SessionCompareContext *cctx = cls;
- struct GNUNET_ATS_Session *s = value;
-
- (void) key;
- if (0 == GNUNET_HELLO_address_cmp (s->address,
- cctx->address))
- {
- GNUNET_assert (GNUNET_NO == s->in_destroy);
- cctx->res = s;
- return GNUNET_NO;
- }
- return GNUNET_OK;
-}
-
-
-/**
- * Locate an existing session the transport service is using to
- * send data to another peer. Performs some basic sanity checks
- * on the address and then tries to locate a matching session.
- *
- * @param cls the plugin
- * @param address the address we should locate the session by
- * @return the session if it exists, or NULL if it is not found
- */
-static struct GNUNET_ATS_Session *
-xu_plugin_lookup_session (void *cls,
- const struct GNUNET_HELLO_Address *address)
-{
- struct Plugin *plugin = cls;
- const struct IPv6XuAddress *xu_a6;
- const struct IPv4XuAddress *xu_a4;
- struct GNUNET_ATS_SessionCompareContext cctx;
-
- if (NULL == address->address)
- {
- GNUNET_break (0);
- return NULL;
- }
- if (sizeof(struct IPv4XuAddress) == address->address_length)
- {
- if (NULL == plugin->sockv4)
- return NULL;
- xu_a4 = (const struct IPv4XuAddress *) address->address;
- if (0 == xu_a4->u4_port)
- {
- GNUNET_break (0);
- return NULL;
- }
- }
- else if (sizeof(struct IPv6XuAddress) == address->address_length)
- {
- if (NULL == plugin->sockv6)
- return NULL;
- xu_a6 = (const struct IPv6XuAddress *) address->address;
- if (0 == xu_a6->u6_port)
- {
- GNUNET_break (0);
- return NULL;
- }
- }
- else
- {
- GNUNET_break (0);
- return NULL;
- }
-
- /* check if session already exists */
- cctx.address = address;
- cctx.res = NULL;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Looking for existing session for peer `%s' with address `%s'\n",
- GNUNET_i2s (&address->peer),
- xu_address_to_string (plugin,
- address->address,
- address->address_length));
- GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
- &address->peer,
- &session_cmp_it,
- &cctx);
- if (NULL == cctx.res)
- return NULL;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Found existing session %p\n",
- cctx.res);
- return cctx.res;
-}
-
-
-/* ********************** Timeout ****************** */
-
-
-/**
- * Increment session timeout due to activity.
- *
- * @param s session to reschedule timeout activity for
- */
-static void
-reschedule_session_timeout (struct GNUNET_ATS_Session *s)
-{
- if (GNUNET_YES == s->in_destroy)
- return;
- GNUNET_assert (NULL != s->timeout_task);
- s->timeout = GNUNET_TIME_relative_to_absolute (XU_SESSION_TIME_OUT);
-}
-
-
-
-/**
- * Function that will be called whenever the transport service wants to
- * notify the plugin that a session is still active and in use and
- * therefore the session timeout for this session has to be updated
- *
- * @param cls closure with the `struct Plugin`
- * @param peer which peer was the session for
- * @param session which session is being updated
- */
-static void
-xu_plugin_update_session_timeout (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- struct GNUNET_ATS_Session *session)
-{
- struct Plugin *plugin = cls;
-
- if (GNUNET_YES !=
- GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
- peer,
- session))
- {
- GNUNET_break (0);
- return;
- }
- /* Reschedule session timeout */
- reschedule_session_timeout (session);
-}
-
-
-/* ************************* Sending ************************ */
-
-
-/**
- * We failed to transmit a message via XU. Generate
- * a descriptive error message.
- *
- * @param plugin our plugin
- * @param sa target address we were trying to reach
- * @param slen number of bytes in @a sa
- * @param error the errno value returned from the sendto() call
- */
-static void
-analyze_send_error (struct Plugin *plugin,
- const struct sockaddr *sa,
- socklen_t slen,
- int error)
-{
- enum GNUNET_NetworkType type;
-
- type = plugin->env->get_address_type (plugin->env->cls,
- sa,
- slen);
- if ( ( (GNUNET_NT_LAN == type) ||
- (GNUNET_NT_WAN == type) ) &&
- ( (ENETUNREACH == errno) ||
- (ENETDOWN == errno) ) )
- {
- if (slen == sizeof (struct sockaddr_in))
- {
- /* IPv4: "Network unreachable" or "Network down"
- *
- * This indicates we do not have connectivity
- */
- LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
- _("XU could not transmit message to `%s': "
- "Network seems down, please check your network configuration\n"),
- GNUNET_a2s (sa,
- slen));
- }
- if (slen == sizeof (struct sockaddr_in6))
- {
- /* IPv6: "Network unreachable" or "Network down"
- *
- * This indicates that this system is IPv6 enabled, but does not
- * have a valid global IPv6 address assigned or we do not have
- * connectivity
- */
- LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
- _("XU could not transmit IPv6 message! "
- "Please check your network configuration and disable IPv6 if your "
- "connection does not have a global IPv6 address\n"));
- }
- }
- else
- {
- LOG (GNUNET_ERROR_TYPE_WARNING,
- "XU could not transmit message to `%s': `%s'\n",
- GNUNET_a2s (sa,
- slen),
- STRERROR (error));
- }
-}
-
-
-
-
-/**
- * Function that can be used by the transport service to transmit a
- * message using the plugin. Note that in the case of a peer
- * disconnecting, the continuation MUST be called prior to the
- * disconnect notification itself. This function will be called with
- * this peer's HELLO message to initiate a fresh connection to another
- * peer.
- *
- * @param cls closure
- * @param s which session must be used
- * @param msgbuf the message to transmit
- * @param msgbuf_size number of bytes in @a msgbuf
- * @param priority how important is the message (most plugins will
- * ignore message priority and just FIFO)
- * @param to how long to wait at most for the transmission (does not
- * require plugins to discard the message after the timeout,
- * just advisory for the desired delay; most plugins will ignore
- * this as well)
- * @param cont continuation to call once the message has
- * been transmitted (or if the transport is ready
- * for the next transmission call; or if the
- * peer disconnected...); can be NULL
- * @param cont_cls closure for @a cont
- * @return number of bytes used (on the physical network, with overheads);
- * -1 on hard errors (i.e. address invalid); 0 is a legal value
- * and does NOT mean that the message was not transmitted (DV)
- */
-static ssize_t
-xu_plugin_send (void *cls,
- struct GNUNET_ATS_Session *s,
- const char *msgbuf,
- size_t msgbuf_size,
- unsigned int priority,
- struct GNUNET_TIME_Relative to,
- GNUNET_TRANSPORT_TransmitContinuation cont,
- void *cont_cls)
-{
- struct Plugin *plugin = cls;
- size_t xumlen = msgbuf_size + sizeof(struct XUMessage);
- struct XUMessage *xu;
- char mbuf[xumlen] GNUNET_ALIGN;
- ssize_t sent;
- socklen_t slen;
- const struct sockaddr *a;
- const struct IPv4XuAddress *u4;
- struct sockaddr_in a4;
- const struct IPv6XuAddress *u6;
- struct sockaddr_in6 a6;
- struct GNUNET_NETWORK_Handle *sock;
-
- (void) priority;
- (void) to;
- if ( (sizeof(struct IPv6XuAddress) == s->address->address_length) &&
- (NULL == plugin->sockv6) )
- return GNUNET_SYSERR;
- if ( (sizeof(struct IPv4XuAddress) == s->address->address_length) &&
- (NULL == plugin->sockv4) )
- return GNUNET_SYSERR;
- if (xumlen >= GNUNET_MAX_MESSAGE_SIZE)
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- if (GNUNET_YES !=
- GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
- &s->target,
- s))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "XU transmits %u-byte message to `%s' using address `%s'\n",
- xumlen,
- GNUNET_i2s (&s->target),
- xu_address_to_string (plugin,
- s->address->address,
- s->address->address_length));
- xu = (struct XUMessage *) mbuf;
- xu->header.size = htons (xumlen);
- xu->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_XU_MESSAGE);
- xu->reserved = htonl (0);
- xu->sender = *plugin->env->my_identity;
- GNUNET_memcpy (&xu[1],
- msgbuf,
- msgbuf_size);
-
- if (sizeof (struct IPv4XuAddress) == s->address->address_length)
- {
- u4 = s->address->address;
- memset (&a4,
- 0,
- sizeof(a4));
- a4.sin_family = AF_INET;
-#if HAVE_SOCKADDR_IN_SIN_LEN
- a4.sin_len = sizeof (a4);
-#endif
- a4.sin_port = u4->u4_port;
- a4.sin_addr.s_addr = u4->ipv4_addr;
- a = (const struct sockaddr *) &a4;
- slen = sizeof (a4);
- sock = plugin->sockv4;
- }
- else if (sizeof (struct IPv6XuAddress) == s->address->address_length)
- {
- u6 = s->address->address;
- memset (&a6,
- 0,
- sizeof(a6));
- a6.sin6_family = AF_INET6;
-#if HAVE_SOCKADDR_IN_SIN_LEN
- a6.sin6_len = sizeof (a6);
-#endif
- a6.sin6_port = u6->u6_port;
- a6.sin6_addr = u6->ipv6_addr;
- a = (const struct sockaddr *) &a6;
- slen = sizeof (a6);
- sock = plugin->sockv6;
- }
- else
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
-
- sent = GNUNET_NETWORK_socket_sendto (sock,
- mbuf,
- xumlen,
- a,
- slen);
- s->last_transmit_time
- = GNUNET_TIME_absolute_max (GNUNET_TIME_absolute_get (),
- s->last_transmit_time);
-
- if (GNUNET_SYSERR == sent)
- {
- /* Failure */
- analyze_send_error (plugin,
- a,
- slen,
- errno);
- GNUNET_STATISTICS_update (plugin->env->stats,
- "# XU, total, bytes, sent, failure",
- sent,
- GNUNET_NO);
- GNUNET_STATISTICS_update (plugin->env->stats,
- "# XU, total, messages, sent, failure",
- 1,
- GNUNET_NO);
- return GNUNET_SYSERR;
- }
- /* Success */
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "XU transmitted %u-byte message to `%s' `%s' (%d: %s)\n",
- (unsigned int) (msgbuf_size),
- GNUNET_i2s (&s->target),
- GNUNET_a2s (a,
- slen),
- (int ) sent,
- (sent < 0) ? STRERROR (errno) : "ok");
- GNUNET_STATISTICS_update (plugin->env->stats,
- "# XU, total, bytes, sent, success",
- sent,
- GNUNET_NO);
- GNUNET_STATISTICS_update (plugin->env->stats,
- "# XU, total, messages, sent, success",
- 1,
- GNUNET_NO);
- cont (cont_cls,
- &s->target,
- GNUNET_OK,
- msgbuf_size,
- xumlen);
- notify_session_monitor (s->plugin,
- s,
- GNUNET_TRANSPORT_SS_UPDATE);
- return xumlen;
-}
-
-
-/* ********************** Receiving ********************** */
-
-
-/**
- * Functions with this signature are called whenever we need to close
- * a session due to a disconnect or failure to establish a connection.
- *
- * @param cls closure with the `struct Plugin`
- * @param s session to close down
- * @return #GNUNET_OK on success
- */
-static int
-xu_disconnect_session (void *cls,
- struct GNUNET_ATS_Session *s)
-{
- struct Plugin *plugin = cls;
-
- GNUNET_assert (GNUNET_YES != s->in_destroy);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Session %p to peer `%s' at address %s ended\n",
- s,
- GNUNET_i2s (&s->target),
- xu_address_to_string (plugin,
- s->address->address,
- s->address->address_length));
- if (NULL != s->timeout_task)
- {
- GNUNET_SCHEDULER_cancel (s->timeout_task);
- s->timeout_task = NULL;
- }
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (plugin->sessions,
- &s->target,
- s));
- s->in_destroy = GNUNET_YES;
- notify_session_monitor (s->plugin,
- s,
- GNUNET_TRANSPORT_SS_DONE);
- plugin->env->session_end (plugin->env->cls,
- s->address,
- s);
- GNUNET_STATISTICS_set (plugin->env->stats,
- "# XU sessions active",
- GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
- GNUNET_NO);
- if (0 == s->rc)
- free_session (s);
- return GNUNET_OK;
-}
-
-
-/**
- * Message tokenizer has broken up an incomming message. Pass it on
- * to the service.
- *
- * @param cls the `struct GNUNET_ATS_Session *`
- * @param hdr the actual message
- * @return #GNUNET_OK (always)
- */
-static int
-process_inbound_tokenized_messages (void *cls,
- const struct GNUNET_MessageHeader *hdr)
-{
- struct GNUNET_ATS_Session *session = cls;
- struct Plugin *plugin = session->plugin;
-
- if (GNUNET_YES == session->in_destroy)
- return GNUNET_OK;
- reschedule_session_timeout (session);
- session->flow_delay_for_other_peer
- = plugin->env->receive (plugin->env->cls,
- session->address,
- session,
- hdr);
- return GNUNET_OK;
-}
-
-
-/**
- * Destroy a session, plugin is being unloaded.
- *
- * @param cls the `struct Plugin`
- * @param key hash of public key of target peer
- * @param value a `struct PeerSession *` to clean up
- * @return #GNUNET_OK (continue to iterate)
- */
-static int
-disconnect_and_free_it (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
-{
- struct Plugin *plugin = cls;
-
- (void) key;
- xu_disconnect_session (plugin,
- value);
- return GNUNET_OK;
-}
-
-
-/**
- * Disconnect from a remote node. Clean up session if we have one for
- * this peer.
- *
- * @param cls closure for this call (should be handle to Plugin)
- * @param target the peeridentity of the peer to disconnect
- * @return #GNUNET_OK on success, #GNUNET_SYSERR if the operation failed
- */
-static void
-xu_disconnect (void *cls,
- const struct GNUNET_PeerIdentity *target)
-{
- struct Plugin *plugin = cls;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Disconnecting from peer `%s'\n",
- GNUNET_i2s (target));
- GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
- target,
- &disconnect_and_free_it,
- plugin);
-}
-
-
-/**
- * Session was idle, so disconnect it.
- *
- * @param cls the `struct GNUNET_ATS_Session` to time out
- */
-static void
-session_timeout (void *cls)
-{
- struct GNUNET_ATS_Session *s = cls;
- struct Plugin *plugin = s->plugin;
- struct GNUNET_TIME_Relative left;
-
- s->timeout_task = NULL;
- left = GNUNET_TIME_absolute_get_remaining (s->timeout);
- if (left.rel_value_us > 0)
- {
- /* not actually our turn yet, but let's at least update
- the monitor, it may think we're about to die ... */
- notify_session_monitor (s->plugin,
- s,
- GNUNET_TRANSPORT_SS_UPDATE);
- s->timeout_task = GNUNET_SCHEDULER_add_delayed (left,
- &session_timeout,
- s);
- return;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Session %p was idle for %s, disconnecting\n",
- s,
- GNUNET_STRINGS_relative_time_to_string (XU_SESSION_TIME_OUT,
- GNUNET_YES));
- /* call session destroy function */
- xu_disconnect_session (plugin,
- s);
-}
-
-
-/**
- * Allocate a new session for the given endpoint address.
- * Note that this function does not inform the service
- * of the new session, this is the responsibility of the
- * caller (if needed).
- *
- * @param cls the `struct Plugin`
- * @param address address of the other peer to use
- * @param network_type network type the address belongs to
- * @return NULL on error, otherwise session handle
- */
-static struct GNUNET_ATS_Session *
-xu_plugin_create_session (void *cls,
- const struct GNUNET_HELLO_Address *address,
- enum GNUNET_NetworkType network_type)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *s;
-
- s = GNUNET_new (struct GNUNET_ATS_Session);
- s->mst = GNUNET_MST_create (&process_inbound_tokenized_messages,
- s);
- s->plugin = plugin;
- s->address = GNUNET_HELLO_address_copy (address);
- s->target = address->peer;
- s->last_transmit_time = GNUNET_TIME_absolute_get ();
- s->last_expected_ack_delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
- 250);
- s->last_expected_msg_delay = GNUNET_TIME_UNIT_MILLISECONDS;
- s->flow_delay_from_other_peer = GNUNET_TIME_UNIT_ZERO;
- s->flow_delay_for_other_peer = GNUNET_TIME_UNIT_ZERO;
- s->timeout = GNUNET_TIME_relative_to_absolute (XU_SESSION_TIME_OUT);
- s->timeout_task = GNUNET_SCHEDULER_add_delayed (XU_SESSION_TIME_OUT,
- &session_timeout,
- s);
- s->scope = network_type;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Creating new session %p for peer `%s' address `%s'\n",
- s,
- GNUNET_i2s (&address->peer),
- xu_address_to_string (plugin,
- address->address,
- address->address_length));
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CONTAINER_multipeermap_put (plugin->sessions,
- &s->target,
- s,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
- GNUNET_STATISTICS_set (plugin->env->stats,
- "# XU sessions active",
- GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
- GNUNET_NO);
- notify_session_monitor (plugin,
- s,
- GNUNET_TRANSPORT_SS_INIT);
- return s;
-}
-
-
-/**
- * Creates a new outbound session the transport service will use to
- * send data to the peer.
- *
- * @param cls the `struct Plugin *`
- * @param address the address
- * @return the session or NULL of max connections exceeded
- */
-static struct GNUNET_ATS_Session *
-xu_plugin_get_session (void *cls,
- const struct GNUNET_HELLO_Address *address)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *s;
- enum GNUNET_NetworkType network_type = GNUNET_NT_UNSPECIFIED;
- const struct IPv4XuAddress *xu_v4;
- const struct IPv6XuAddress *xu_v6;
-
- if (NULL == address)
- {
- GNUNET_break (0);
- return NULL;
- }
- if ( (address->address_length != sizeof(struct IPv4XuAddress)) &&
- (address->address_length != sizeof(struct IPv6XuAddress)) )
- {
- GNUNET_break_op (0);
- return NULL;
- }
- if (NULL != (s = xu_plugin_lookup_session (cls,
- address)))
- return s;
-
- /* need to create new session */
- if (sizeof (struct IPv4XuAddress) == address->address_length)
- {
- struct sockaddr_in v4;
-
- xu_v4 = (const struct IPv4XuAddress *) address->address;
- memset (&v4, '\0', sizeof (v4));
- v4.sin_family = AF_INET;
-#if HAVE_SOCKADDR_IN_SIN_LEN
- v4.sin_len = sizeof (struct sockaddr_in);
-#endif
- v4.sin_port = xu_v4->u4_port;
- v4.sin_addr.s_addr = xu_v4->ipv4_addr;
- network_type = plugin->env->get_address_type (plugin->env->cls,
- (const struct sockaddr *) &v4,
- sizeof (v4));
- }
- if (sizeof (struct IPv6XuAddress) == address->address_length)
- {
- struct sockaddr_in6 v6;
-
- xu_v6 = (const struct IPv6XuAddress *) address->address;
- memset (&v6, '\0', sizeof (v6));
- v6.sin6_family = AF_INET6;
-#if HAVE_SOCKADDR_IN_SIN_LEN
- v6.sin6_len = sizeof (struct sockaddr_in6);
-#endif
- v6.sin6_port = xu_v6->u6_port;
- v6.sin6_addr = xu_v6->ipv6_addr;
- network_type = plugin->env->get_address_type (plugin->env->cls,
- (const struct sockaddr *) &v6,
- sizeof (v6));
- }
- GNUNET_break (GNUNET_NT_UNSPECIFIED != network_type);
- return xu_plugin_create_session (cls,
- address,
- network_type);
-}
-
-
-/**
- * We've received a XU Message. Process it (pass contents to main service).
- *
- * @param plugin plugin context
- * @param msg the message
- * @param xu_addr sender address
- * @param xu_addr_len number of bytes in @a xu_addr
- * @param network_type network type the address belongs to
- */
-static void
-process_xu_message (struct Plugin *plugin,
- const struct XUMessage *msg,
- const union XuAddress *xu_addr,
- size_t xu_addr_len,
- enum GNUNET_NetworkType network_type)
-{
- struct GNUNET_ATS_Session *s;
- struct GNUNET_HELLO_Address *address;
-
- GNUNET_break (GNUNET_NT_UNSPECIFIED != network_type);
- if (0 != ntohl (msg->reserved))
- {
- GNUNET_break_op(0);
- return;
- }
- if (ntohs (msg->header.size)
- < sizeof(struct GNUNET_MessageHeader) + sizeof(struct XUMessage))
- {
- GNUNET_break_op(0);
- return;
- }
-
- address = GNUNET_HELLO_address_allocate (&msg->sender,
- PLUGIN_NAME,
- xu_addr,
- xu_addr_len,
- GNUNET_HELLO_ADDRESS_INFO_NONE);
- if (NULL ==
- (s = xu_plugin_lookup_session (plugin,
- address)))
- {
- s = xu_plugin_create_session (plugin,
- address,
- network_type);
- plugin->env->session_start (plugin->env->cls,
- address,
- s,
- s->scope);
- notify_session_monitor (plugin,
- s,
- GNUNET_TRANSPORT_SS_UP);
- }
- GNUNET_free (address);
-
- s->rc++;
- GNUNET_MST_from_buffer (s->mst,
- (const char *) &msg[1],
- ntohs (msg->header.size) - sizeof(struct XUMessage),
- GNUNET_YES,
- GNUNET_NO);
- s->rc--;
- if ( (0 == s->rc) &&
- (GNUNET_YES == s->in_destroy) )
- free_session (s);
-}
-
-
-/**
- * Read and process a message from the given socket.
- *
- * @param plugin the overall plugin
- * @param rsock socket to read from
- */
-static void
-xu_select_read (struct Plugin *plugin,
- struct GNUNET_NETWORK_Handle *rsock)
-{
- socklen_t fromlen;
- struct sockaddr_storage addr;
- char buf[65536] GNUNET_ALIGN;
- ssize_t size;
- const struct GNUNET_MessageHeader *msg;
- struct IPv4XuAddress v4;
- struct IPv6XuAddress v6;
- const struct sockaddr *sa;
- const struct sockaddr_in *sa4;
- const struct sockaddr_in6 *sa6;
- const union XuAddress *int_addr;
- size_t int_addr_len;
- enum GNUNET_NetworkType network_type;
-
- fromlen = sizeof (addr);
- memset (&addr,
- 0,
- sizeof(addr));
- size = GNUNET_NETWORK_socket_recvfrom (rsock,
- buf,
- sizeof (buf),
- (struct sockaddr *) &addr,
- &fromlen);
- sa = (const struct sockaddr *) &addr;
-#if MINGW
- /* On SOCK_DGRAM XU sockets recvfrom might fail with a
- * WSAECONNRESET error to indicate that previous sendto() (yes, sendto!)
- * on this socket has failed.
- * Quote from MSDN:
- * WSAECONNRESET - The virtual circuit was reset by the remote side
- * executing a hard or abortive close. The application should close
- * the socket; it is no longer usable. On a XU-datagram socket this
- * error indicates a previous send operation resulted in an ICMP Port
- * Unreachable message.
- */
- if ( (-1 == size) &&
- (ECONNRESET == errno) )
- return;
-#endif
- if (-1 == size)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "XU failed to receive data: %s\n",
- STRERROR (errno));
- /* Connection failure or something. Not a protocol violation. */
- return;
- }
-
- /* Check if this is a STUN packet */
- if (GNUNET_NO !=
- GNUNET_NAT_stun_handle_packet (plugin->nat,
- (const struct sockaddr *) &addr,
- fromlen,
- buf,
- size))
- return; /* was STUN, do not process further */
-
- if (((size_t) size) < sizeof(struct GNUNET_MessageHeader))
- {
- LOG (GNUNET_ERROR_TYPE_WARNING,
- "XU got %u bytes from %s, which is not enough for a GNUnet message header\n",
- (unsigned int ) size,
- GNUNET_a2s (sa,
- fromlen));
- /* _MAY_ be a connection failure (got partial message) */
- /* But it _MAY_ also be that the other side uses non-GNUnet protocol. */
- GNUNET_break_op (0);
- return;
- }
-
- msg = (const struct GNUNET_MessageHeader *) buf;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "XU received %u-byte message from `%s' type %u\n",
- (unsigned int) size,
- GNUNET_a2s (sa,
- fromlen),
- ntohs (msg->type));
- if (size != ntohs (msg->size))
- {
- LOG (GNUNET_ERROR_TYPE_WARNING,
- "XU malformed message (size %u) header from %s\n",
- (unsigned int) size,
- GNUNET_a2s (sa,
- fromlen));
- GNUNET_break_op (0);
- return;
- }
- GNUNET_STATISTICS_update (plugin->env->stats,
- "# XU, total bytes received",
- size,
- GNUNET_NO);
- network_type = plugin->env->get_address_type (plugin->env->cls,
- sa,
- fromlen);
- switch (sa->sa_family)
- {
- case AF_INET:
- sa4 = (const struct sockaddr_in *) &addr;
- v4.options = 0;
- v4.ipv4_addr = sa4->sin_addr.s_addr;
- v4.u4_port = sa4->sin_port;
- int_addr = (union XuAddress *) &v4;
- int_addr_len = sizeof (v4);
- break;
- case AF_INET6:
- sa6 = (const struct sockaddr_in6 *) &addr;
- v6.options = 0;
- v6.ipv6_addr = sa6->sin6_addr;
- v6.u6_port = sa6->sin6_port;
- int_addr = (union XuAddress *) &v6;
- int_addr_len = sizeof (v6);
- break;
- default:
- GNUNET_break (0);
- return;
- }
-
- switch (ntohs (msg->type))
- {
- case GNUNET_MESSAGE_TYPE_TRANSPORT_XU_MESSAGE:
- if (ntohs (msg->size) < sizeof(struct XUMessage))
- {
- GNUNET_break_op(0);
- return;
- }
- process_xu_message (plugin,
- (const struct XUMessage *) msg,
- int_addr,
- int_addr_len,
- network_type);
- return;
- default:
- GNUNET_break_op(0);
- return;
- }
-}
-
-
-/* ***************** Event loop (part 2) *************** */
-
-
-/**
- * We have been notified that our readset has something to read. We don't
- * know which socket needs to be read, so we have to check each one
- * Then reschedule this function to be called again once more is available.
- *
- * @param cls the plugin handle
- */
-static void
-xu_plugin_select_v4 (void *cls)
-{
- struct Plugin *plugin = cls;
- const struct GNUNET_SCHEDULER_TaskContext *tc;
-
- plugin->select_task_v4 = NULL;
- if (NULL == plugin->sockv4)
- return;
- tc = GNUNET_SCHEDULER_get_task_context ();
- if ( (0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
- (GNUNET_NETWORK_fdset_isset (tc->read_ready,
- plugin->sockv4)) )
- xu_select_read (plugin,
- plugin->sockv4);
- schedule_select_v4 (plugin);
-}
-
-
-/**
- * We have been notified that our readset has something to read. We don't
- * know which socket needs to be read, so we have to check each one
- * Then reschedule this function to be called again once more is available.
- *
- * @param cls the plugin handle
- */
-static void
-xu_plugin_select_v6 (void *cls)
-{
- struct Plugin *plugin = cls;
- const struct GNUNET_SCHEDULER_TaskContext *tc;
-
- plugin->select_task_v6 = NULL;
- if (NULL == plugin->sockv6)
- return;
- tc = GNUNET_SCHEDULER_get_task_context ();
- if ( (0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
- (GNUNET_NETWORK_fdset_isset (tc->read_ready,
- plugin->sockv6)) )
- xu_select_read (plugin,
- plugin->sockv6);
- schedule_select_v6 (plugin);
-}
-
-
-/* ******************* Initialization *************** */
-
-
-/**
- * Setup the XU sockets (for IPv4 and IPv6) for the plugin.
- *
- * @param plugin the plugin to initialize
- * @param bind_v6 IPv6 address to bind to (can be NULL, for 'any')
- * @param bind_v4 IPv4 address to bind to (can be NULL, for 'any')
- * @return number of sockets that were successfully bound
- */
-static unsigned int
-setup_sockets (struct Plugin *plugin,
- const struct sockaddr_in6 *bind_v6,
- const struct sockaddr_in *bind_v4)
-{
- int tries;
- unsigned int sockets_created = 0;
- struct sockaddr_in6 server_addrv6;
- struct sockaddr_in server_addrv4;
- const struct sockaddr *server_addr;
- const struct sockaddr *addrs[2];
- socklen_t addrlens[2];
- socklen_t addrlen;
- int eno;
-
- /* Create IPv6 socket */
- eno = EINVAL;
- if (GNUNET_YES == plugin->enable_ipv6)
- {
- plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6,
- SOCK_DGRAM,
- 0);
- if (NULL == plugin->sockv6)
- {
- LOG (GNUNET_ERROR_TYPE_INFO,
- _("Disabling IPv6 since it is not supported on this system!\n"));
- plugin->enable_ipv6 = GNUNET_NO;
- }
- else
- {
- memset (&server_addrv6,
- 0,
- sizeof(struct sockaddr_in6));
-#if HAVE_SOCKADDR_IN_SIN_LEN
- server_addrv6.sin6_len = sizeof (struct sockaddr_in6);
-#endif
- server_addrv6.sin6_family = AF_INET6;
- if (NULL != bind_v6)
- server_addrv6.sin6_addr = bind_v6->sin6_addr;
- else
- server_addrv6.sin6_addr = in6addr_any;
-
- if (0 == plugin->port) /* autodetect */
- server_addrv6.sin6_port
- = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
- 33537)
- + 32000);
- else
- server_addrv6.sin6_port = htons (plugin->port);
- addrlen = sizeof (struct sockaddr_in6);
- server_addr = (const struct sockaddr *) &server_addrv6;
-
- tries = 0;
- while (tries < 10)
- {
- LOG(GNUNET_ERROR_TYPE_DEBUG,
- "Binding to IPv6 `%s'\n",
- GNUNET_a2s (server_addr,
- addrlen));
- /* binding */
- if (GNUNET_OK ==
- GNUNET_NETWORK_socket_bind (plugin->sockv6,
- server_addr,
- addrlen))
- break;
- eno = errno;
- if (0 != plugin->port)
- {
- tries = 10; /* fail immediately */
- break; /* bind failed on specific port */
- }
- /* autodetect */
- server_addrv6.sin6_port
- = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
- 33537)
- + 32000);
- tries++;
- }
- if (tries >= 10)
- {
- GNUNET_NETWORK_socket_close (plugin->sockv6);
- plugin->enable_ipv6 = GNUNET_NO;
- plugin->sockv6 = NULL;
- }
- else
- {
- plugin->port = ntohs (server_addrv6.sin6_port);
- }
- if (NULL != plugin->sockv6)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "IPv6 XU socket created listinging at %s\n",
- GNUNET_a2s (server_addr,
- addrlen));
- addrs[sockets_created] = server_addr;
- addrlens[sockets_created] = addrlen;
- sockets_created++;
- }
- else
- {
- LOG (GNUNET_ERROR_TYPE_WARNING,
- _("Failed to bind XU socket to %s: %s\n"),
- GNUNET_a2s (server_addr,
- addrlen),
- STRERROR (eno));
- }
- }
- }
-
- /* Create IPv4 socket */
- eno = EINVAL;
- plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET,
- SOCK_DGRAM,
- 0);
- if (NULL == plugin->sockv4)
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
- "socket");
- LOG (GNUNET_ERROR_TYPE_INFO,
- _("Disabling IPv4 since it is not supported on this system!\n"));
- plugin->enable_ipv4 = GNUNET_NO;
- }
- else
- {
- memset (&server_addrv4,
- 0,
- sizeof(struct sockaddr_in));
-#if HAVE_SOCKADDR_IN_SIN_LEN
- server_addrv4.sin_len = sizeof (struct sockaddr_in);
-#endif
- server_addrv4.sin_family = AF_INET;
- if (NULL != bind_v4)
- server_addrv4.sin_addr = bind_v4->sin_addr;
- else
- server_addrv4.sin_addr.s_addr = INADDR_ANY;
-
- if (0 == plugin->port)
- /* autodetect */
- server_addrv4.sin_port
- = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
- 33537)
- + 32000);
- else
- server_addrv4.sin_port = htons (plugin->port);
-
- addrlen = sizeof (struct sockaddr_in);
- server_addr = (const struct sockaddr *) &server_addrv4;
-
- tries = 0;
- while (tries < 10)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Binding to IPv4 `%s'\n",
- GNUNET_a2s (server_addr,
- addrlen));
-
- /* binding */
- if (GNUNET_OK ==
- GNUNET_NETWORK_socket_bind (plugin->sockv4,
- server_addr,
- addrlen))
- break;
- eno = errno;
- if (0 != plugin->port)
- {
- tries = 10; /* fail */
- break; /* bind failed on specific port */
- }
-
- /* autodetect */
- server_addrv4.sin_port
- = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
- 33537)
- + 32000);
- tries++;
- }
- if (tries >= 10)
- {
- GNUNET_NETWORK_socket_close (plugin->sockv4);
- plugin->enable_ipv4 = GNUNET_NO;
- plugin->sockv4 = NULL;
- }
- else
- {
- plugin->port = ntohs (server_addrv4.sin_port);
- }
-
- if (NULL != plugin->sockv4)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "IPv4 socket created on port %s\n",
- GNUNET_a2s (server_addr,
- addrlen));
- addrs[sockets_created] = server_addr;
- addrlens[sockets_created] = addrlen;
- sockets_created++;
- }
- else
- {
- LOG (GNUNET_ERROR_TYPE_ERROR,
- _("Failed to bind XU socket to %s: %s\n"),
- GNUNET_a2s (server_addr,
- addrlen),
- STRERROR (eno));
- }
- }
-
- if (0 == sockets_created)
- {
- LOG (GNUNET_ERROR_TYPE_WARNING,
- _("Failed to open XU sockets\n"));
- return 0; /* No sockets created, return */
- }
- schedule_select_v4 (plugin);
- schedule_select_v6 (plugin);
- plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
- "transport-xu",
- IPPROTO_UDP,
- sockets_created,
- addrs,
- addrlens,
- &xu_nat_port_map_callback,
- NULL,
- plugin);
- return sockets_created;
-}
-
-
-/**
- * The exported method. Makes the core api available via a global and
- * returns the xu transport API.
- *
- * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
- * @return our `struct GNUNET_TRANSPORT_PluginFunctions`
- */
-void *
-libgnunet_plugin_transport_xu_init (void *cls)
-{
- struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
- struct GNUNET_TRANSPORT_PluginFunctions *api;
- struct Plugin *p;
- unsigned long long port;
- unsigned long long aport;
- int enable_v6;
- char *bind4_address;
- char *bind6_address;
- struct sockaddr_in server_addrv4;
- struct sockaddr_in6 server_addrv6;
- unsigned int res;
- int have_bind4;
- int have_bind6;
-
- if (NULL == env->receive)
- {
- /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
- initialze the plugin or the API */
- api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
- api->cls = NULL;
- api->address_pretty_printer = &xu_plugin_address_pretty_printer;
- api->address_to_string = &xu_address_to_string;
- api->string_to_address = &xu_string_to_address;
- return api;
- }
-
- /* Get port number: port == 0 : autodetect a port,
- * > 0 : use this port, not given : 2086 default */
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (env->cfg,
- "transport-xu",
- "PORT",
- &port))
- port = 2086;
- if (port > 65535)
- {
- GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
- "transport-xu",
- "PORT",
- _("must be in [0,65535]"));
- return NULL;
- }
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (env->cfg,
- "transport-xu",
- "ADVERTISED_PORT",
- &aport))
- aport = port;
- if (aport > 65535)
- {
- GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
- "transport-xu",
- "ADVERTISED_PORT",
- _("must be in [0,65535]"));
- return NULL;
- }
-
- if (GNUNET_YES ==
- GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
- "nat",
- "DISABLEV6"))
- enable_v6 = GNUNET_NO;
- else
- enable_v6 = GNUNET_YES;
-
- have_bind4 = GNUNET_NO;
- memset (&server_addrv4,
- 0,
- sizeof (server_addrv4));
- if (GNUNET_YES ==
- GNUNET_CONFIGURATION_get_value_string (env->cfg,
- "transport-xu",
- "BINDTO",
- &bind4_address))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Binding XU plugin to specific address: `%s'\n",
- bind4_address);
- if (1 != inet_pton (AF_INET,
- bind4_address,
- &server_addrv4.sin_addr))
- {
- GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
- "transport-xu",
- "BINDTO",
- _("must be valid IPv4 address"));
- GNUNET_free (bind4_address);
- return NULL;
- }
- have_bind4 = GNUNET_YES;
- }
- GNUNET_free_non_null (bind4_address);
- have_bind6 = GNUNET_NO;
- memset (&server_addrv6,
- 0,
- sizeof (server_addrv6));
- if (GNUNET_YES ==
- GNUNET_CONFIGURATION_get_value_string (env->cfg,
- "transport-xu",
- "BINDTO6",
- &bind6_address))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Binding xu plugin to specific address: `%s'\n",
- bind6_address);
- if (1 != inet_pton (AF_INET6,
- bind6_address,
- &server_addrv6.sin6_addr))
- {
- GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
- "transport-xu",
- "BINDTO6",
- _("must be valid IPv6 address"));
- GNUNET_free (bind6_address);
- return NULL;
- }
- have_bind6 = GNUNET_YES;
- }
- GNUNET_free_non_null (bind6_address);
-
- p = GNUNET_new (struct Plugin);
- p->port = port;
- p->aport = aport;
- p->enable_ipv6 = enable_v6;
- p->enable_ipv4 = GNUNET_YES; /* default */
- p->env = env;
- p->sessions = GNUNET_CONTAINER_multipeermap_create (16,
- GNUNET_NO);
- res = setup_sockets (p,
- (GNUNET_YES == have_bind6) ? &server_addrv6 : NULL,
- (GNUNET_YES == have_bind4) ? &server_addrv4 : NULL);
- if ( (0 == res) ||
- ( (NULL == p->sockv4) &&
- (NULL == p->sockv6) ) )
- {
- LOG (GNUNET_ERROR_TYPE_ERROR,
- _("Failed to create XU network sockets\n"));
- GNUNET_CONTAINER_multipeermap_destroy (p->sessions);
- if (NULL != p->nat)
- GNUNET_NAT_unregister (p->nat);
- GNUNET_free (p);
- return NULL;
- }
-
- api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
- api->cls = p;
- api->disconnect_session = &xu_disconnect_session;
- api->query_keepalive_factor = &xu_query_keepalive_factor;
- api->disconnect_peer = &xu_disconnect;
- api->address_pretty_printer = &xu_plugin_address_pretty_printer;
- api->address_to_string = &xu_address_to_string;
- api->string_to_address = &xu_string_to_address;
- api->check_address = &xu_plugin_check_address;
- api->get_session = &xu_plugin_get_session;
- api->send = &xu_plugin_send;
- api->get_network = &xu_plugin_get_network;
- api->get_network_for_address = &xu_plugin_get_network_for_address;
- api->update_session_timeout = &xu_plugin_update_session_timeout;
- api->setup_monitor = &xu_plugin_setup_monitor;
- return api;
-}
-
-
-/**
- * The exported method. Makes the core api available via a global and
- * returns the xu transport API.
- *
- * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
- * @return NULL
- */
-void *
-libgnunet_plugin_transport_xu_done (void *cls)
-{
- struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
- struct Plugin *plugin = api->cls;
- struct PrettyPrinterContext *cur;
-
- if (NULL == plugin)
- {
- GNUNET_free (api);
- return NULL;
- }
- if (NULL != plugin->select_task_v4)
- {
- GNUNET_SCHEDULER_cancel (plugin->select_task_v4);
- plugin->select_task_v4 = NULL;
- }
- if (NULL != plugin->select_task_v6)
- {
- GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
- plugin->select_task_v6 = NULL;
- }
- if (NULL != plugin->sockv4)
- {
- GNUNET_break (GNUNET_OK ==
- GNUNET_NETWORK_socket_close (plugin->sockv4));
- plugin->sockv4 = NULL;
- }
- if (NULL != plugin->sockv6)
- {
- GNUNET_break (GNUNET_OK ==
- GNUNET_NETWORK_socket_close (plugin->sockv6));
- plugin->sockv6 = NULL;
- }
- if (NULL != plugin->nat)
- {
- GNUNET_NAT_unregister (plugin->nat);
- plugin->nat = NULL;
- }
- GNUNET_CONTAINER_multipeermap_destroy (plugin->sessions);
-
- while (NULL != (cur = plugin->ppc_dll_head))
- {
- GNUNET_break (0);
- GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
- plugin->ppc_dll_tail,
- cur);
- GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
- if (NULL != cur->timeout_task)
- {
- GNUNET_SCHEDULER_cancel (cur->timeout_task);
- cur->timeout_task = NULL;
- }
- GNUNET_free (cur);
- }
- GNUNET_free (plugin);
- GNUNET_free (api);
- return NULL;
-}
-
-/* end of plugin_transport_xu.c */
projects / oweals / gnunet.git / commitdiff