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authorClaudiu Olteanu <claudiu@140774ce-b5e7-0310-ab8b-a85725594a96>2013-07-13 14:58:52 +0000
committerClaudiu Olteanu <claudiu@140774ce-b5e7-0310-ab8b-a85725594a96>2013-07-13 14:58:52 +0000
commit43e5720102d5e2ee2e33ee0d90da0442511573b6 (patch)
treefc739acd7320bd0781f444e59086e930c20e8a74 /src/transport/plugin_transport_bluetooth.c
parent407baaccce283d80794a93c3d496b6afa6950c31 (diff)
Adding a copy of wlan plugin used for bluetooth plugin
Diffstat (limited to 'src/transport/plugin_transport_bluetooth.c')
-rw-r--r--src/transport/plugin_transport_bluetooth.c1879
1 files changed, 1879 insertions, 0 deletions
diff --git a/src/transport/plugin_transport_bluetooth.c b/src/transport/plugin_transport_bluetooth.c
new file mode 100644
index 000000000..57de3022b
--- /dev/null
+++ b/src/transport/plugin_transport_bluetooth.c
@@ -0,0 +1,1879 @@
+/*
+ This file is part of GNUnet
+ (C) 2010, 2011, 2012 Christian Grothoff (and other contributing authors)
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file transport/plugin_transport_bluetooth.c
+ * @brief transport plugin for bluetooth
+ * @author David Brodski
+ * @author Christian Grothoff
+ *
+ * THIS IS A COPY OF plugin_transport_wlan.c
+ */
+#include "platform.h"
+#include "gnunet_hello_lib.h"
+#include "gnunet_protocols.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_statistics_service.h"
+#include "gnunet_transport_service.h"
+#include "gnunet_transport_plugin.h"
+#include "plugin_transport_wlan.h"
+#include "gnunet_common.h"
+#include "gnunet_crypto_lib.h"
+#include "gnunet_fragmentation_lib.h"
+#include "gnunet_constants.h"
+
+#define LOG(kind,...) GNUNET_log_from (kind, "transport-bluetooth",__VA_ARGS__)
+
+#define PLUGIN_NAME "bluetooth"
+
+/**
+ * Max size of packet (that we give to the WLAN driver for transmission)
+ */
+#define WLAN_MTU 1430
+
+/**
+ * time out of a mac endpoint
+ */
+#define MACENDPOINT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2)
+
+/**
+ * We reduce the frequence of HELLO beacons in relation to
+ * the number of MAC addresses currently visible to us.
+ * This is the multiplication factor.
+ */
+#define HELLO_BEACON_SCALING_FACTOR GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 2)
+
+/**
+ * Maximum number of messages in defragmentation queue per MAC
+ */
+#define MESSAGES_IN_DEFRAG_QUEUE_PER_MAC 2
+
+/**
+ * Link layer control fields for better compatibility
+ * (i.e. GNUnet over WLAN is not IP-over-WLAN).
+ */
+#define WLAN_LLC_DSAP_FIELD 0x1f
+#define WLAN_LLC_SSAP_FIELD 0x1f
+
+
+GNUNET_NETWORK_STRUCT_BEGIN
+/**
+ * Header for messages which need fragmentation. This is the format of
+ * a message we obtain AFTER defragmentation. We then need to check
+ * the CRC and then tokenize the payload and pass it to the
+ * 'receive' callback.
+ */
+struct WlanHeader
+{
+
+ /**
+ * Message type is GNUNET_MESSAGE_TYPE_WLAN_DATA.
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * CRC32 checksum (only over the payload), in NBO.
+ */
+ uint32_t crc GNUNET_PACKED;
+
+ /**
+ * Sender of the message.
+ */
+ struct GNUNET_PeerIdentity sender;
+
+ /**
+ * Target of the message.
+ */
+ struct GNUNET_PeerIdentity target;
+
+ /* followed by payload, possibly including
+ multiple messages! */
+
+};
+
+
+struct WlanAddress
+{
+ uint32_t options GNUNET_PACKED;
+
+ struct GNUNET_TRANSPORT_WLAN_MacAddress mac;
+};
+
+
+GNUNET_NETWORK_STRUCT_END
+
+
+/**
+ * Information kept for each message that is yet to be fragmented and
+ * transmitted.
+ */
+struct PendingMessage
+{
+ /**
+ * next entry in the DLL
+ */
+ struct PendingMessage *next;
+
+ /**
+ * previous entry in the DLL
+ */
+ struct PendingMessage *prev;
+
+ /**
+ * The pending message
+ */
+ struct WlanHeader *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;
+
+ /**
+ * Cls for transmit_cont
+ */
+ void *transmit_cont_cls;
+
+ /**
+ * Timeout task (for this message).
+ */
+ GNUNET_SCHEDULER_TaskIdentifier timeout_task;
+
+};
+
+
+/**
+ * Session handle for connections with other peers.
+ */
+struct Session
+{
+ /**
+ * To whom are we talking to (set to our identity
+ * if we are still waiting for the welcome message)
+ */
+ struct GNUNET_PeerIdentity target;
+
+ /**
+ * API requirement (must be first).
+ */
+ struct SessionHeader header;
+
+ /**
+ * We keep all sessions in a DLL at their respective
+ * 'struct MACEndpoint'.
+ */
+ struct Session *next;
+
+ /**
+ * We keep all sessions in a DLL at their respective
+ * 'struct MACEndpoint'.
+ */
+ struct Session *prev;
+
+ /**
+ * MAC endpoint with the address of this peer.
+ */
+ struct MacEndpoint *mac;
+
+ /**
+ * Head of messages currently pending for transmission to this peer.
+ */
+ struct PendingMessage *pending_message_head;
+
+ /**
+ * Tail of messages currently pending for transmission to this peer.
+ */
+ struct PendingMessage *pending_message_tail;
+
+ /**
+ * When should this session time out?
+ */
+ struct GNUNET_TIME_Absolute timeout;
+
+ /**
+ * Timeout task (for the session).
+ */
+ GNUNET_SCHEDULER_TaskIdentifier timeout_task;
+
+};
+
+
+/**
+ * Struct for messages that are being fragmented in a MAC's transmission queue.
+ */
+struct FragmentMessage
+{
+
+ /**
+ * This is a doubly-linked list.
+ */
+ struct FragmentMessage *next;
+
+ /**
+ * This is a doubly-linked list.
+ */
+ struct FragmentMessage *prev;
+
+ /**
+ * MAC endpoint this message belongs to
+ */
+ struct MacEndpoint *macendpoint;
+
+ /**
+ * Fragmentation context
+ */
+ struct GNUNET_FRAGMENT_Context *fragcontext;
+
+ /**
+ * Transmission handle to helper (to cancel if the frag context
+ * is destroyed early for some reason).
+ */
+ struct GNUNET_HELPER_SendHandle *sh;
+
+ /**
+ * Intended recipient.
+ */
+ struct GNUNET_PeerIdentity target;
+
+ /**
+ * Timeout value for the message.
+ */
+ struct GNUNET_TIME_Absolute timeout;
+
+ /**
+ * Timeout task.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier timeout_task;
+
+ /**
+ * Continuation to call when we're done with this message.
+ */
+ GNUNET_TRANSPORT_TransmitContinuation cont;
+
+ /**
+ * Closure for 'cont'
+ */
+ void *cont_cls;
+
+ /**
+ * Size of original message
+ */
+ size_t size_payload;
+
+ /**
+ * Number of bytes used to transmit message
+ */
+ size_t size_on_wire;
+
+};
+
+
+/**
+ * Struct to represent one network card connection
+ */
+struct MacEndpoint
+{
+
+ /**
+ * We keep all MACs in a DLL in the plugin.
+ */
+ struct MacEndpoint *next;
+
+ /**
+ * We keep all MACs in a DLL in the plugin.
+ */
+ struct MacEndpoint *prev;
+
+ /**
+ * Pointer to the global plugin struct.
+ */
+ struct Plugin *plugin;
+
+ /**
+ * Head of sessions that use this MAC.
+ */
+ struct Session *sessions_head;
+
+ /**
+ * Tail of sessions that use this MAC.
+ */
+ struct Session *sessions_tail;
+
+ /**
+ * Head of messages we are currently sending to this MAC.
+ */
+ struct FragmentMessage *sending_messages_head;
+
+ /**
+ * Tail of messages we are currently sending to this MAC.
+ */
+ struct FragmentMessage *sending_messages_tail;
+
+ /**
+ * Defrag context for this MAC
+ */
+ struct GNUNET_DEFRAGMENT_Context *defrag;
+
+ /**
+ * When should this endpoint time out?
+ */
+ struct GNUNET_TIME_Absolute timeout;
+
+ /**
+ * Timeout task.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier timeout_task;
+
+ /**
+ * count of messages in the fragment out queue for this mac endpoint
+ */
+ unsigned int fragment_messages_out_count;
+
+ /**
+ * peer mac address
+ */
+ struct WlanAddress addr;
+
+ /**
+ * Message delay for fragmentation context
+ */
+ struct GNUNET_TIME_Relative msg_delay;
+
+ /**
+ * ACK delay for fragmentation context
+ */
+ struct GNUNET_TIME_Relative ack_delay;
+
+ /**
+ * Desired transmission power for this MAC
+ */
+ uint16_t tx_power;
+
+ /**
+ * Desired transmission rate for this MAC
+ */
+ uint8_t rate;
+
+ /**
+ * Antenna we should use for this MAC
+ */
+ uint8_t antenna;
+
+};
+
+
+/**
+ * Encapsulation of all of the state of the plugin.
+ */
+struct Plugin
+{
+ /**
+ * Our environment.
+ */
+ struct GNUNET_TRANSPORT_PluginEnvironment *env;
+
+ /**
+ * Handle to helper process for priviledged operations.
+ */
+ struct GNUNET_HELPER_Handle *suid_helper;
+
+ /**
+ * ARGV-vector for the helper (all helpers take only the binary
+ * name, one actual argument, plus the NULL terminator for 'argv').
+ */
+ char * helper_argv[3];
+
+ /**
+ * The interface of the wlan card given to us by the user.
+ */
+ char *interface;
+
+ /**
+ * Tokenizer for demultiplexing of data packets resulting from defragmentation.
+ */
+ struct GNUNET_SERVER_MessageStreamTokenizer *fragment_data_tokenizer;
+
+ /**
+ * Tokenizer for demultiplexing of data packets received from the suid helper
+ */
+ struct GNUNET_SERVER_MessageStreamTokenizer *helper_payload_tokenizer;
+
+ /**
+ * Tokenizer for demultiplexing of data packets that follow the WLAN Header
+ */
+ struct GNUNET_SERVER_MessageStreamTokenizer *wlan_header_payload_tokenizer;
+
+ /**
+ * Head of list of open connections.
+ */
+ struct MacEndpoint *mac_head;
+
+ /**
+ * Tail of list of open connections.
+ */
+ struct MacEndpoint *mac_tail;
+
+ /**
+ * Number of connections
+ */
+ unsigned int mac_count;
+
+ /**
+ * Task that periodically sends a HELLO beacon via the helper.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier beacon_task;
+
+ /**
+ * Tracker for bandwidth limit
+ */
+ struct GNUNET_BANDWIDTH_Tracker tracker;
+
+ /**
+ * The mac_address of the wlan card given to us by the helper.
+ */
+ struct GNUNET_TRANSPORT_WLAN_MacAddress mac_address;
+
+ /**
+ * Have we received a control message with our MAC address yet?
+ */
+ int have_mac;
+
+ /**
+ * Options for addresses
+ */
+ uint32_t options;
+
+};
+
+
+/**
+ * Information associated with a message. Can contain
+ * the session or the MAC endpoint associated with the
+ * message (or both).
+ */
+struct MacAndSession
+{
+ /**
+ * NULL if the identity of the other peer is not known.
+ */
+ struct Session *session;
+
+ /**
+ * MAC address of the other peer, NULL if not known.
+ */
+ struct MacEndpoint *endpoint;
+};
+
+/**
+ * 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
+ * @param addrlen length of the address
+ * @return string representing the same address
+ */
+static const char *
+bluetooth_plugin_address_to_string (void *cls, const void *addr, size_t addrlen);
+
+/**
+ * Print MAC addresses nicely.
+ *
+ * @param mac the mac address
+ * @return string to a static buffer with the human-readable mac, will be overwritten during the next call to this function
+ */
+static const char *
+mac_to_string (const struct GNUNET_TRANSPORT_WLAN_MacAddress * mac)
+{
+ static char macstr[20];
+
+ GNUNET_snprintf (macstr, sizeof (macstr), "%.2X:%.2X:%.2X:%.2X:%.2X:%.2X",
+ mac->mac[0], mac->mac[1],
+ mac->mac[2], mac->mac[3], mac->mac[4], mac->mac[5]);
+ return macstr;
+}
+
+
+/**
+ * Fill the radiotap header
+ *
+ * @param endpoint pointer to the endpoint, can be NULL
+ * @param header pointer to the radiotap header
+ * @param size total message size
+ */
+static void
+get_radiotap_header (struct MacEndpoint *endpoint,
+ struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *header,
+ uint16_t size)
+{
+ header->header.type = ntohs (GNUNET_MESSAGE_TYPE_WLAN_DATA_TO_HELPER);
+ header->header.size = ntohs (size);
+ if (NULL != endpoint)
+ {
+ header->rate = endpoint->rate;
+ header->tx_power = endpoint->tx_power;
+ header->antenna = endpoint->antenna;
+ }
+ else
+ {
+ header->rate = 255;
+ header->tx_power = 0;
+ header->antenna = 0;
+ }
+}
+
+
+/**
+ * Generate the WLAN hardware header for one packet
+ *
+ * @param plugin the plugin handle
+ * @param header address to write the header to
+ * @param to_mac_addr address of the recipient
+ * @param size size of the whole packet, needed to calculate the time to send the packet
+ */
+static void
+get_wlan_header (struct Plugin *plugin,
+ struct GNUNET_TRANSPORT_WLAN_Ieee80211Frame *header,
+ const struct GNUNET_TRANSPORT_WLAN_MacAddress *to_mac_addr,
+ unsigned int size)
+{
+ const int rate = 11000000;
+
+ header->frame_control = htons (IEEE80211_FC0_TYPE_DATA);
+ header->addr1 = *to_mac_addr;
+ header->addr2 = plugin->mac_address;
+ header->addr3 = mac_bssid_gnunet;
+ header->duration = GNUNET_htole16 ((size * 1000000) / rate + 290);
+ header->sequence_control = 0; // FIXME?
+ header->llc[0] = WLAN_LLC_DSAP_FIELD;
+ header->llc[1] = WLAN_LLC_SSAP_FIELD;
+ header->llc[2] = 0; // FIXME?
+ header->llc[3] = 0; // FIXME?
+}
+
+
+/**
+ * Send an ACK for a fragment we received.
+ *
+ * @param cls the 'struct MacEndpoint' the ACK must be sent to
+ * @param msg_id id of the message
+ * @param hdr pointer to the hdr where the ack is stored
+ */
+static void
+send_ack (void *cls, uint32_t msg_id,
+ const struct GNUNET_MessageHeader *hdr)
+{
+ struct MacEndpoint *endpoint = cls;
+ struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage* radio_header;
+ uint16_t msize = ntohs (hdr->size);
+ size_t size = sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + msize;
+ char buf[size];
+
+ if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending ACK to helper\n");
+ radio_header = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *) buf;
+ get_radiotap_header (endpoint, radio_header, size);
+ get_wlan_header (endpoint->plugin,
+ &radio_header->frame,
+ &endpoint->addr.mac,
+ size);
+ memcpy (&radio_header[1], hdr, msize);
+ if (NULL !=
+ GNUNET_HELPER_send (endpoint->plugin->suid_helper,
+ &radio_header->header,
+ GNUNET_NO /* dropping ACKs is bad */,
+ NULL, NULL))
+ GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# Bluetooth ACKs sent"),
+ 1, GNUNET_NO);
+}
+
+
+/**
+ * Handles the data after all fragments are put together
+ *
+ * @param cls macendpoint this messages belongs to
+ * @param hdr pointer to the data
+ */
+static void
+bluetooth_data_message_handler (void *cls, const struct GNUNET_MessageHeader *hdr)
+{
+ struct MacEndpoint *endpoint = cls;
+ struct Plugin *plugin = endpoint->plugin;
+ struct MacAndSession mas;
+
+ GNUNET_STATISTICS_update (plugin->env->stats,
+ _("# Bluetooth messages defragmented"), 1,
+ GNUNET_NO);
+ mas.session = NULL;
+ mas.endpoint = endpoint;
+ (void) GNUNET_SERVER_mst_receive (plugin->fragment_data_tokenizer,
+ &mas,
+ (const char *) hdr,
+ ntohs (hdr->size),
+ GNUNET_YES, GNUNET_NO);
+}
+
+
+/**
+ * Free a session
+ *
+ * @param session the session free
+ */
+static void
+free_session (struct Session *session)
+{
+ struct MacEndpoint *endpoint = session->mac;
+ struct PendingMessage *pm;
+
+ endpoint->plugin->env->session_end (endpoint->plugin->env->cls,
+ &session->target,
+ session);
+ while (NULL != (pm = session->pending_message_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (session->pending_message_head,
+ session->pending_message_tail, pm);
+ if (GNUNET_SCHEDULER_NO_TASK != pm->timeout_task)
+ {
+ GNUNET_SCHEDULER_cancel (pm->timeout_task);
+ pm->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_free (pm->msg);
+ GNUNET_free (pm);
+ }
+ GNUNET_CONTAINER_DLL_remove (endpoint->sessions_head,
+ endpoint->sessions_tail,
+ session);
+ if (session->timeout_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (session->timeout_task);
+ session->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# Bluetooth sessions allocated"), -1,
+ GNUNET_NO);
+ GNUNET_free (session);
+}
+
+
+/**
+ * A session is timing out. Clean up.
+ *
+ * @param cls pointer to the Session
+ * @param tc pointer to the GNUNET_SCHEDULER_TaskContext
+ */
+static void
+session_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Session * session = cls;
+ struct GNUNET_TIME_Relative timeout;
+
+ session->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ timeout = GNUNET_TIME_absolute_get_remaining (session->timeout);
+ if (0 == timeout.rel_value)
+ {
+ free_session (session);
+ return;
+ }
+ session->timeout_task =
+ GNUNET_SCHEDULER_add_delayed (timeout, &session_timeout, session);
+}
+
+
+/**
+ * Create a new session
+ *
+ * @param endpoint pointer to the mac endpoint of the peer
+ * @param peer peer identity to use for this session
+ * @return returns the session
+ */
+static struct Session *
+create_session (struct MacEndpoint *endpoint,
+ const struct GNUNET_PeerIdentity *peer)
+{
+ struct Session *session;
+
+ for (session = endpoint->sessions_head; NULL != session; session = session->next)
+ if (0 == memcmp (peer, &session->target,
+ sizeof (struct GNUNET_PeerIdentity)))
+ {
+ session->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
+ return session;
+ }
+ GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# Bluetooth sessions allocated"), 1,
+ GNUNET_NO);
+ session = GNUNET_malloc (sizeof (struct Session));
+ GNUNET_CONTAINER_DLL_insert_tail (endpoint->sessions_head,
+ endpoint->sessions_tail,
+ session);
+ session->mac = endpoint;
+ session->target = *peer;
+ 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);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Created new session for peer `%s' with endpoint %s\n",
+ GNUNET_i2s (peer),
+ mac_to_string (&endpoint->addr.mac));
+ return session;
+}
+
+
+/**
+ * Function called once we have successfully given the fragment
+ * message to the SUID helper process and we are thus ready for
+ * the next fragment.
+ *
+ * @param cls the 'struct FragmentMessage'
+ * @param result result of the operation (GNUNET_OK on success, GNUNET_NO if the helper died, GNUNET_SYSERR
+ * if the helper was stopped)
+ */
+static void
+fragment_transmission_done (void *cls,
+ int result)
+{
+ struct FragmentMessage *fm = cls;
+
+
+ fm->sh = NULL;
+ GNUNET_FRAGMENT_context_transmission_done (fm->fragcontext);
+}
+
+
+/**
+ * Transmit a fragment of a message.
+ *
+ * @param cls 'struct FragmentMessage' this fragment message belongs to
+ * @param hdr pointer to the start of the fragment message
+ */
+static void
+transmit_fragment (void *cls,
+ const struct GNUNET_MessageHeader *hdr)
+{
+ struct FragmentMessage *fm = cls;
+ struct MacEndpoint *endpoint = fm->macendpoint;
+ size_t size;
+ uint16_t msize;
+
+ msize = ntohs (hdr->size);
+ size = sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + msize;
+ {
+ char buf[size];
+ struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *radio_header;
+
+ radio_header = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *) buf;
+ get_radiotap_header (endpoint, radio_header, size);
+ get_wlan_header (endpoint->plugin,
+ &radio_header->frame,
+ &endpoint->addr.mac,
+ size);
+ memcpy (&radio_header[1], hdr, msize);
+ GNUNET_assert (NULL == fm->sh);
+ fm->sh = GNUNET_HELPER_send (endpoint->plugin->suid_helper,
+ &radio_header->header,
+ GNUNET_NO,
+ &fragment_transmission_done, fm);
+ fm->size_on_wire += size;
+ if (NULL != fm->sh)
+ GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# Bluetooth message fragments sent"),
+ 1, GNUNET_NO);
+ else
+ GNUNET_FRAGMENT_context_transmission_done (fm->fragcontext);
+ GNUNET_STATISTICS_update (endpoint->plugin->env->stats,
+ "# bytes currently in Bluetooth buffers",
+ -msize, GNUNET_NO);
+ GNUNET_STATISTICS_update (endpoint->plugin->env->stats,
+ "# bytes transmitted via Bluetooth",
+ msize, GNUNET_NO);
+ }
+}
+
+
+/**
+ * Frees the space of a message in the fragment queue (send queue)
+ *
+ * @param fm message to free
+ */
+static void
+free_fragment_message (struct FragmentMessage *fm)
+{
+ struct MacEndpoint *endpoint = fm->macendpoint;
+
+ GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# Bluetooth messages pending (with fragmentation)"),
+ -1, GNUNET_NO);
+ GNUNET_CONTAINER_DLL_remove (endpoint->sending_messages_head,
+ endpoint->sending_messages_tail, fm);
+ if (NULL != fm->sh)
+ {
+ GNUNET_HELPER_send_cancel (fm->sh);
+ fm->sh = NULL;
+ }
+ GNUNET_FRAGMENT_context_destroy (fm->fragcontext,
+ &endpoint->msg_delay,
+ &endpoint->ack_delay);
+ if (fm->timeout_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (fm->timeout_task);
+ fm->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_free (fm);
+}
+
+
+/**
+ * A FragmentMessage has timed out. Remove it.
+ *
+ * @param cls pointer to the 'struct FragmentMessage'
+ * @param tc pointer to the GNUNET_SCHEDULER_TaskContext
+ */
+static void
+fragmentmessage_timeout (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct FragmentMessage *fm = cls;
+
+ fm->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ if (NULL != fm->cont)
+ {
+ fm->cont (fm->cont_cls, &fm->target, GNUNET_SYSERR, fm->size_payload, fm->size_on_wire);
+ fm->cont = NULL;
+ }
+ free_fragment_message (fm);
+}
+
+
+/**
+ * Transmit a message to the given destination with fragmentation.
+ *
+ * @param endpoint desired destination
+ * @param timeout how long can the message wait?
+ * @param target peer that should receive the message
+ * @param msg message to transmit
+ * @param payload_size bytes of payload
+ * @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 cont
+ */
+static void
+send_with_fragmentation (struct MacEndpoint *endpoint,
+ struct GNUNET_TIME_Relative timeout,
+ const struct GNUNET_PeerIdentity *target,
+ const struct GNUNET_MessageHeader *msg,
+ size_t payload_size,
+ GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
+
+{
+ struct FragmentMessage *fm;
+ struct Plugin *plugin;
+
+ plugin = endpoint->plugin;
+ fm = GNUNET_malloc (sizeof (struct FragmentMessage));
+ fm->macendpoint = endpoint;
+ fm->target = *target;
+ fm->size_payload = payload_size;
+ fm->size_on_wire = 0;
+ fm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
+ fm->cont = cont;
+ fm->cont_cls = cont_cls;
+ /* 1 MBit/s typical data rate, 1430 byte fragments => ~100 ms per message */
+ fm->fragcontext =
+ GNUNET_FRAGMENT_context_create (plugin->env->stats, WLAN_MTU,
+ &plugin->tracker,
+ endpoint->msg_delay,
+ endpoint->ack_delay,
+ msg,
+ &transmit_fragment, fm);
+ fm->timeout_task =
+ GNUNET_SCHEDULER_add_delayed (timeout,
+ &fragmentmessage_timeout, fm);
+ GNUNET_CONTAINER_DLL_insert_tail (endpoint->sending_messages_head,
+ endpoint->sending_messages_tail,
+ fm);
+}
+
+
+/**
+ * Free a MAC endpoint.
+ *
+ * @param endpoint pointer to the MacEndpoint to free
+ */
+static void
+free_macendpoint (struct MacEndpoint *endpoint)
+{
+ struct Plugin *plugin = endpoint->plugin;
+ struct FragmentMessage *fm;
+ struct Session *session;
+
+ GNUNET_STATISTICS_update (plugin->env->stats,
+ _("# Bluetooth MAC endpoints allocated"), -1, GNUNET_NO);
+ while (NULL != (session = endpoint->sessions_head))
+ free_session (session);
+ while (NULL != (fm = endpoint->sending_messages_head))
+ free_fragment_message (fm);
+ GNUNET_CONTAINER_DLL_remove (plugin->mac_head,
+ plugin->mac_tail,
+ endpoint);
+
+ if (NULL != endpoint->defrag)
+ {
+ GNUNET_DEFRAGMENT_context_destroy(endpoint->defrag);
+ endpoint->defrag = NULL;
+ }
+
+ plugin->mac_count--;
+ if (GNUNET_SCHEDULER_NO_TASK != endpoint->timeout_task)
+ {
+ GNUNET_SCHEDULER_cancel (endpoint->timeout_task);
+ endpoint->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_free (endpoint);
+}
+
+
+/**
+ * A MAC endpoint is timing out. Clean up.
+ *
+ * @param cls pointer to the MacEndpoint
+ * @param tc pointer to the GNUNET_SCHEDULER_TaskContext
+ */
+static void
+macendpoint_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct MacEndpoint *endpoint = cls;
+ struct GNUNET_TIME_Relative timeout;
+
+ endpoint->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ timeout = GNUNET_TIME_absolute_get_remaining (endpoint->timeout);
+ if (0 == timeout.rel_value)
+ {
+ free_macendpoint (endpoint);
+ return;
+ }
+ endpoint->timeout_task =
+ GNUNET_SCHEDULER_add_delayed (timeout, &macendpoint_timeout,
+ endpoint);
+}
+
+
+/**
+ * Find (or create) a MacEndpoint with a specific MAC address
+ *
+ * @param plugin pointer to the plugin struct
+ * @param addr the MAC address of the endpoint
+ * @return handle to our data structure for this MAC
+ */
+static struct MacEndpoint *
+create_macendpoint (struct Plugin *plugin,
+ const struct WlanAddress *addr)
+{
+ struct MacEndpoint *pos;
+
+ for (pos = plugin->mac_head; NULL != pos; pos = pos->next)
+ if (0 == memcmp (addr, &pos->addr, sizeof (struct WlanAddress)))
+ return pos;
+ pos = GNUNET_malloc (sizeof (struct MacEndpoint));
+ pos->addr = *addr;
+ pos->plugin = plugin;
+ pos->defrag =
+ GNUNET_DEFRAGMENT_context_create (plugin->env->stats, WLAN_MTU,
+ MESSAGES_IN_DEFRAG_QUEUE_PER_MAC,
+ pos,
+ &bluetooth_data_message_handler,
+ &send_ack);
+
+ pos->msg_delay = GNUNET_TIME_UNIT_MILLISECONDS;
+ pos->ack_delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
+ 100);
+ pos->timeout = GNUNET_TIME_relative_to_absolute (MACENDPOINT_TIMEOUT);
+ pos->timeout_task =
+ GNUNET_SCHEDULER_add_delayed (MACENDPOINT_TIMEOUT, &macendpoint_timeout,
+ pos);
+ GNUNET_CONTAINER_DLL_insert (plugin->mac_head, plugin->mac_tail, pos);
+ plugin->mac_count++;
+ GNUNET_STATISTICS_update (plugin->env->stats, _("# Bluetooth MAC endpoints allocated"),
+ 1, GNUNET_NO);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "New MAC endpoint `%s'\n",
+ bluetooth_plugin_address_to_string(NULL, addr, sizeof (struct WlanAddress)));
+ return pos;
+}
+
+/**
+ * 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_ATS_Network_Type
+bluetooth_get_network (void *cls, void *session)
+{
+ GNUNET_assert (NULL != session);
+ return GNUNET_ATS_NET_BT;
+}
+
+
+/**
+ * Creates a new outbound session the transport service will use to send data to the
+ * peer
+ *
+ * @param cls the plugin
+ * @param address the address
+ * @return the session or NULL of max connections exceeded
+ */
+static struct Session *
+bluetooth_plugin_get_session (void *cls,
+ const struct GNUNET_HELLO_Address *address)
+{
+ struct Plugin *plugin = cls;
+ struct MacEndpoint *endpoint;
+
+ if (NULL == address)
+ return NULL;
+ if (sizeof (struct WlanAddress) != address->address_length)
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Service asked to create session for peer `%s' with MAC `%s'\n",
+ GNUNET_i2s (&address->peer),
+ bluetooth_plugin_address_to_string(NULL, address->address, address->address_length));
+ endpoint = create_macendpoint (plugin, address->address);
+ return create_session (endpoint, &address->peer);
+}
+
+
+/**
+ * Function that can be used to force the plugin to disconnect
+ * from the given peer and cancel all previous transmissions
+ * (and their continuation).
+ *
+ * @param cls closure
+ * @param target peer from which to disconnect
+ */
+static void
+bluetooth_plugin_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
+{
+ struct Plugin *plugin = cls;
+ struct Session *session;
+ struct MacEndpoint *endpoint;
+
+ for (endpoint = plugin->mac_head; NULL != endpoint; endpoint = endpoint->next)
+ for (session = endpoint->sessions_head; NULL != session; session = session->next)
+ if (0 == memcmp (target, &session->target,
+ sizeof (struct GNUNET_PeerIdentity)))
+ {
+ free_session (session);
+ break; /* inner-loop only (in case peer has another MAC as well!) */
+ }
+}
+
+
+/**
+ * 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 '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 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
+bluetooth_plugin_send (void *cls,
+ struct 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 WlanHeader *wlanheader;
+ size_t size = msgbuf_size + sizeof (struct WlanHeader);
+ char buf[size] GNUNET_ALIGN;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmitting %u bytes of payload to peer `%s' (starting with %u byte message of type %u)\n",
+ msgbuf_size,
+ GNUNET_i2s (&session->target),
+ (unsigned int) ntohs (((struct GNUNET_MessageHeader*)msgbuf)->size),
+ (unsigned int) ntohs (((struct GNUNET_MessageHeader*)msgbuf)->type));
+ wlanheader = (struct WlanHeader *) buf;
+ wlanheader->header.size = htons (msgbuf_size + sizeof (struct WlanHeader));
+ wlanheader->header.type = htons (GNUNET_MESSAGE_TYPE_WLAN_DATA);
+ wlanheader->sender = *plugin->env->my_identity;
+ wlanheader->target = session->target;
+ wlanheader->crc = htonl (GNUNET_CRYPTO_crc32_n (msgbuf, msgbuf_size));
+ memcpy (&wlanheader[1], msgbuf, msgbuf_size);
+
+ GNUNET_STATISTICS_update (plugin->env->stats,
+ "# bytes currently in Bluetooth buffers",
+ msgbuf_size, GNUNET_NO);
+
+ send_with_fragmentation (session->mac,
+ to,
+ &session->target,
+ &wlanheader->header,
+ msgbuf_size,
+ cont, cont_cls);
+ return size;
+}
+
+
+/**
+ * We have received data from the WLAN via some session. Process depending
+ * on the message type (HELLO, DATA, FRAGMENTATION or FRAGMENTATION-ACK).
+ *
+ * @param cls pointer to the plugin
+ * @param client pointer to the session this message belongs to
+ * @param hdr start of the message
+ */
+static int
+process_data (void *cls, void *client, const struct GNUNET_MessageHeader *hdr)
+{
+ struct Plugin *plugin = cls;
+ struct MacAndSession *mas = client;
+ struct MacAndSession xmas;
+ struct GNUNET_ATS_Information ats;
+ struct FragmentMessage *fm;
+ struct GNUNET_PeerIdentity tmpsource;
+ const struct WlanHeader *wlanheader;
+ int ret;
+ uint16_t msize;
+
+ ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
+ ats.value = htonl (GNUNET_ATS_NET_BT);
+ msize = ntohs (hdr->size);
+
+ GNUNET_STATISTICS_update (plugin->env->stats,
+ "# bytes received via Bluetooth",
+ msize, GNUNET_NO);
+
+ switch (ntohs (hdr->type))
+ {
+ case GNUNET_MESSAGE_TYPE_HELLO:
+ if (GNUNET_OK !=
+ GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hdr, &tmpsource))
+ {
+ GNUNET_break_op (0);
+ break;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Processing %u bytes of HELLO from peer `%s' at MAC %s\n",
+ (unsigned int) msize,
+ GNUNET_i2s (&tmpsource),
+ bluetooth_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)));
+
+ GNUNET_STATISTICS_update (plugin->env->stats,
+ _("# HELLO messages received via WLAN"), 1,
+ GNUNET_NO);
+ plugin->env->receive (plugin->env->cls,
+ &tmpsource,
+ hdr,
+ mas->session,
+ (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
+ (mas->endpoint == NULL) ? 0 : sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
+ plugin->env->update_address_metrics (plugin->env->cls,
+ &tmpsource,
+ (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
+ (mas->endpoint == NULL) ? 0 : sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress),
+ mas->session,
+ &ats, 1);
+ break;
+ case GNUNET_MESSAGE_TYPE_FRAGMENT:
+ if (NULL == mas->endpoint)
+ {
+ GNUNET_break (0);
+ break;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Processing %u bytes of FRAGMENT from MAC %s\n",
+ (unsigned int) msize,
+ bluetooth_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)));
+ GNUNET_STATISTICS_update (plugin->env->stats,
+ _("# fragments received via Bluetooth"), 1, GNUNET_NO);
+ (void) GNUNET_DEFRAGMENT_process_fragment (mas->endpoint->defrag,
+ hdr);
+ break;
+ case GNUNET_MESSAGE_TYPE_FRAGMENT_ACK:
+ if (NULL == mas->endpoint)
+ {
+ GNUNET_break (0);
+ break;
+ }
+ GNUNET_STATISTICS_update (plugin->env->stats, _("# ACKs received via Bluetooth"),
+ 1, GNUNET_NO);
+ for (fm = mas->endpoint->sending_messages_head; NULL != fm; fm = fm->next)
+ {
+ ret = GNUNET_FRAGMENT_process_ack (fm->fragcontext, hdr);
+ if (GNUNET_OK == ret)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got last ACK, finished message transmission to `%s' (%p)\n",
+ bluetooth_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)),
+ fm);
+ mas->endpoint->timeout = GNUNET_TIME_relative_to_absolute (MACENDPOINT_TIMEOUT);
+ if (NULL != fm->cont)
+ {
+ fm->cont (fm->cont_cls, &fm->target, GNUNET_OK, fm->size_payload, fm->size_on_wire);
+ fm->cont = NULL;
+ }
+ free_fragment_message (fm);
+ break;
+ }
+ if (GNUNET_NO == ret)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got an ACK, message transmission to `%s' not yet finished\n",
+ bluetooth_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)));
+ break;
+ }
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "ACK not matched against any active fragmentation with MAC `%s'\n",
+ bluetooth_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)));
+ break;
+ case GNUNET_MESSAGE_TYPE_WLAN_DATA:
+ if (NULL == mas->endpoint)
+ {
+ GNUNET_break (0);
+ break;
+ }
+ if (msize < sizeof (struct WlanHeader))
+ {
+ GNUNET_break (0);
+ break;
+ }
+ wlanheader = (const struct WlanHeader *) hdr;
+ if (0 != memcmp (&wlanheader->target,
+ plugin->env->my_identity,
+ sizeof (struct GNUNET_PeerIdentity)))
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Bluetooth data for `%s', not for me, ignoring\n",
+ GNUNET_i2s (&wlanheader->target));
+ break;
+ }
+ if (ntohl (wlanheader->crc) !=
+ GNUNET_CRYPTO_crc32_n (&wlanheader[1], msize - sizeof (struct WlanHeader)))
+ {
+ GNUNET_STATISTICS_update (plugin->env->stats,
+ _("# BluetoothDATA messages discarded due to CRC32 error"), 1,
+ GNUNET_NO);
+ break;
+ }
+ xmas.endpoint = mas->endpoint;
+ xmas.session = create_session (mas->endpoint, &wlanheader->sender);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Processing %u bytes of WLAN DATA from peer `%s'\n",
+ (unsigned int) msize,
+ GNUNET_i2s (&wlanheader->sender));
+ (void) GNUNET_SERVER_mst_receive (plugin->wlan_header_payload_tokenizer,
+ &xmas,
+ (const char *) &wlanheader[1],
+ msize - sizeof (struct WlanHeader),
+ GNUNET_YES, GNUNET_NO);
+ break;
+ default:
+ if (NULL == mas->endpoint)
+ {
+ GNUNET_break (0);
+ break;
+ }
+ if (NULL == mas->session)
+ {
+ GNUNET_break (0);
+ break;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received packet with %u bytes of type %u from peer %s\n",
+ (unsigned int) msize,
+ (unsigned int) ntohs (hdr->type),
+ GNUNET_i2s (&mas->session->target));
+ plugin->env->receive (plugin->env->cls,
+ &mas->session->target,
+ hdr,
+ mas->session,
+ (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
+ (mas->endpoint == NULL) ? 0 : sizeof (struct WlanAddress));
+ plugin->env->update_address_metrics (plugin->env->cls,
+ &mas->session->target,
+ (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
+ (mas->endpoint == NULL) ? 0 : sizeof (struct WlanAddress),
+ mas->session,
+ &ats, 1);
+ break;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Function used for to process the data from the suid process
+ *
+ * @param cls the plugin handle
+ * @param client client that send the data (not used)
+ * @param hdr header of the GNUNET_MessageHeader
+ */
+static int
+handle_helper_message (void *cls, void *client,
+ const struct GNUNET_MessageHeader *hdr)
+{
+ struct Plugin *plugin = cls;
+ const struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *rxinfo;
+ const struct GNUNET_TRANSPORT_WLAN_HelperControlMessage *cm;
+ struct WlanAddress wa;
+ struct MacAndSession mas;
+ uint16_t msize;
+
+ msize = ntohs (hdr->size);
+ switch (ntohs (hdr->type))
+ {
+ case GNUNET_MESSAGE_TYPE_WLAN_HELPER_CONTROL:
+ if (msize != sizeof (struct GNUNET_TRANSPORT_WLAN_HelperControlMessage))
+ {
+ GNUNET_break (0);
+ break;
+ }
+ cm = (const struct GNUNET_TRANSPORT_WLAN_HelperControlMessage *) hdr;
+ if (GNUNET_YES == plugin->have_mac)
+ {
+ if (0 == memcmp (&plugin->mac_address,
+ &cm->mac,
+ sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
+ break; /* no change */
+ /* remove old address */
+ memset (&wa, 0, sizeof (struct WlanAddress));
+ wa.mac = plugin->mac_address;
+ wa.options = htonl(plugin->options);
+ plugin->env->notify_address (plugin->env->cls, GNUNET_NO,
+ &wa,
+ sizeof (wa),
+ "wlan");
+ }
+ plugin->mac_address = cm->mac;
+ plugin->have_mac = GNUNET_YES;
+ memset (&wa, 0, sizeof (struct WlanAddress));
+ wa.mac = plugin->mac_address;
+ wa.options = htonl(plugin->options);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received WLAN_HELPER_CONTROL message with MAC address `%s' for peer `%s'\n",
+ mac_to_string (&cm->mac),
+ GNUNET_i2s (plugin->env->my_identity));
+ plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
+ &wa,
+ sizeof (struct WlanAddress),
+ "wlan");
+ break;
+ case GNUNET_MESSAGE_TYPE_WLAN_DATA_FROM_HELPER:
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got data message from helper with %u bytes\n",
+ msize);
+ GNUNET_STATISTICS_update (plugin->env->stats,
+ _("# DATA messages received via Bluetooth"), 1,
+ GNUNET_NO);
+ if (msize < sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage))
+ {
+ GNUNET_break (0);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Size of packet is too small (%u bytes)\n",
+ msize);
+ break;
+ }
+ rxinfo = (const struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *) hdr;
+
+ /* check if message is actually for us */
+ if (0 != memcmp (&rxinfo->frame.addr3, &mac_bssid_gnunet,
+ sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
+ {
+ /* Not the GNUnet BSSID */
+ break;
+ }
+ if ( (0 != memcmp (&rxinfo->frame.addr1, &bc_all_mac,
+ sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress))) &&
+ (0 != memcmp (&rxinfo->frame.addr1, &plugin->mac_address,
+ sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress))) )
+ {
+ /* Neither broadcast nor specifically for us */
+ break;
+ }
+ if (0 == memcmp (&rxinfo->frame.addr2, &plugin->mac_address,
+ sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
+ {
+ /* packet is FROM us, thus not FOR us */
+ break;
+ }
+
+ GNUNET_STATISTICS_update (plugin->env->stats,
+ _("# Bluetooth DATA messages processed"),
+ 1, GNUNET_NO);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Receiving %u bytes of data from MAC `%s'\n",
+ (unsigned int) (msize - sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage)),
+ mac_to_string (&rxinfo->frame.addr2));
+ wa.mac = rxinfo->frame.addr2;
+ wa.options = htonl (0);
+ mas.endpoint = create_macendpoint (plugin, &wa);
+ mas.session = NULL;
+ (void) GNUNET_SERVER_mst_receive (plugin->helper_payload_tokenizer,
+ &mas,
+ (const char*) &rxinfo[1],
+ msize - sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage),
+ GNUNET_YES, GNUNET_NO);
+ break;
+ default:
+ GNUNET_break (0);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Unexpected message of type %u (%u bytes)",
+ ntohs (hdr->type), ntohs (hdr->size));
+ break;
+ }
+ return GNUNET_OK;
+}
+
+
+
+/**
+ * Task to (periodically) send a HELLO beacon
+ *
+ * @param cls pointer to the plugin struct
+ * @param tc scheduler context
+ */
+static void
+send_hello_beacon (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Plugin *plugin = cls;
+ uint16_t size;
+ uint16_t hello_size;
+ struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *radioHeader;
+ const struct GNUNET_MessageHeader *hello;
+
+ hello = plugin->env->get_our_hello ();
+ hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
+ GNUNET_assert (sizeof (struct WlanHeader) + hello_size <= WLAN_MTU);
+ size = sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + hello_size;
+ {
+ char buf[size] GNUNET_ALIGN;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending %u byte HELLO beacon\n",
+ (unsigned int) size);
+ radioHeader = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage*) buf;
+ get_radiotap_header (NULL, radioHeader, size);
+ get_wlan_header (plugin, &radioHeader->frame, &bc_all_mac, size);
+ memcpy (&radioHeader[1], hello, hello_size);
+ if (NULL !=
+ GNUNET_HELPER_send (plugin->suid_helper,
+ &radioHeader->header,
+ GNUNET_YES /* can drop */,
+ NULL, NULL))
+ GNUNET_STATISTICS_update (plugin->env->stats, _("# HELLO beacons sent via Bluetooth"),
+ 1, GNUNET_NO);
+ }
+ plugin->beacon_task =
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
+ (HELLO_BEACON_SCALING_FACTOR,
+ plugin->mac_count + 1),
+ &send_hello_beacon,
+ plugin);
+
+}
+
+
+/**
+ * Another peer has suggested an address for this
+ * peer and transport plugin. Check that this could be a valid
+ * address. If so, consider adding it to the list
+ * of addresses.
+ *
+ * @param cls closure
+ * @param addr pointer to the address
+ * @param addrlen length of addr
+ * @return GNUNET_OK if this is a plausible address for this peer
+ * and transport
+ */
+static int
+bluetooth_plugin_address_suggested (void *cls, const void *addr, size_t addrlen)
+{
+ struct Plugin *plugin = cls;
+ struct WlanAddress *wa = (struct WlanAddress *) addr;
+
+ if (addrlen != sizeof (struct WlanAddress))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_YES != plugin->have_mac)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Rejecting MAC `%s': I don't know my MAC!\n",
+ mac_to_string (addr));
+ return GNUNET_NO; /* don't know my MAC */
+ }
+ if (0 != memcmp (&wa->mac,
+ &plugin->mac_address,
+ sizeof (wa->mac)))
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Rejecting MAC `%s': not my MAC!\n",
+ mac_to_string (addr));
+ return GNUNET_NO; /* not my MAC */
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * 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
+ * @param addrlen length of the address
+ * @return string representing the same address
+ */
+static const char *
+bluetooth_plugin_address_to_string (void *cls, const void *addr, size_t addrlen)
+{
+ const struct GNUNET_TRANSPORT_WLAN_MacAddress *mac;
+ static char macstr[36];
+
+ if (sizeof (struct WlanAddress) != addrlen)
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ mac = &((struct WlanAddress *) addr)->mac;
+ GNUNET_snprintf (macstr, sizeof (macstr), "%s.%u.%s",
+ PLUGIN_NAME, ntohl (((struct WlanAddress *) addr)->options),
+ mac_to_string (mac));
+ return macstr;
+}
+
+
+/**
+ * Convert the transports address to a nice, human-readable format.
+ *
+ * @param cls closure
+ * @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 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 asc
+ */
+static void
+bluetooth_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)
+{
+ char *ret;
+
+ if (sizeof (struct WlanAddress) != addrlen)
+ {
+ /* invalid address */
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _("Bluetooth address with invalid size encountered\n"));
+ asc (asc_cls, NULL);
+ return;
+ }
+ ret = GNUNET_strdup (bluetooth_plugin_address_to_string(NULL, addr, addrlen));
+ asc (asc_cls, ret);
+ GNUNET_free (ret);
+ asc (asc_cls, NULL);
+}
+
+
+/**
+ * Exit point from the plugin.
+ *
+ * @param cls pointer to the api struct
+ */
+void *
+libgnunet_plugin_transport_bluetooth_done (void *cls)
+{
+ struct WlanAddress wa;
+ struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
+ struct Plugin *plugin = api->cls;
+ struct MacEndpoint *endpoint;
+ struct MacEndpoint *endpoint_next;
+
+ if (NULL == plugin)
+ {
+ GNUNET_free (api);
+ return NULL;
+ }
+
+ if (GNUNET_YES == plugin->have_mac)
+ {
+ memset (&wa, 0, sizeof (wa));
+ wa.options = htonl (plugin->options);
+ wa.mac = plugin->mac_address;
+ plugin->env->notify_address (plugin->env->cls, GNUNET_NO,
+ &wa,
+ sizeof (struct WlanAddress),
+ "wlan");
+ plugin->have_mac = GNUNET_NO;
+ }
+
+ if (GNUNET_SCHEDULER_NO_TASK != plugin->beacon_task)
+ {
+ GNUNET_SCHEDULER_cancel (plugin->beacon_task);
+ plugin->beacon_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (NULL != plugin->suid_helper)
+ {
+ GNUNET_HELPER_stop (plugin->suid_helper, GNUNET_NO);
+ plugin->suid_helper = NULL;
+ }
+ endpoint_next = plugin->mac_head;
+ while (NULL != (endpoint = endpoint_next))
+ {
+ endpoint_next = endpoint->next;
+ free_macendpoint (endpoint);
+ }
+ if (NULL != plugin->fragment_data_tokenizer)
+ {
+ GNUNET_SERVER_mst_destroy (plugin->fragment_data_tokenizer);
+ plugin->fragment_data_tokenizer = NULL;
+ }
+ if (NULL != plugin->wlan_header_payload_tokenizer)
+ {
+ GNUNET_SERVER_mst_destroy (plugin->wlan_header_payload_tokenizer);
+ plugin->wlan_header_payload_tokenizer = NULL;
+ }
+ if (NULL != plugin->helper_payload_tokenizer)
+ {
+ GNUNET_SERVER_mst_destroy (plugin->helper_payload_tokenizer);
+ plugin->helper_payload_tokenizer = NULL;
+ }
+ GNUNET_free_non_null (plugin->interface);
+ GNUNET_free (plugin);
+ GNUNET_free (api);
+ return NULL;
+}
+
+
+/**
+ * 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
+bluetooth_string_to_address (void *cls, const char *addr, uint16_t addrlen,
+ void **buf, size_t *added)
+{
+ struct WlanAddress *wa;
+ unsigned int a[6];
+ unsigned int i;
+ char plugin[5];
+ uint32_t options;
+
+ if ((NULL == addr) || (addrlen == 0))
+ {
+ 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;
+ }
+
+ if (8 != SSCANF (addr,
+ "%4s.%u.%X:%X:%X:%X:%X:%X",
+ plugin, &options,
+ &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ wa = GNUNET_malloc (sizeof (struct WlanAddress));
+ for (i=0;i<6;i++)
+ wa->mac.mac[i] = a[i];
+ wa->options = htonl (0);
+ *buf = wa;
+ *added = sizeof (struct WlanAddress);
+ return GNUNET_OK;
+}
+
+
+/**
+ * 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_bluetooth_init (void *cls)
+{
+ struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
+ struct GNUNET_TRANSPORT_PluginFunctions *api;
+ struct Plugin *plugin;
+ char *interface;
+ unsigned long long testmode;
+ char *binary;
+
+ /* check for 'special' mode */
+ 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_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
+ api->cls = NULL;
+ api->address_pretty_printer = &bluetooth_plugin_address_pretty_printer;
+ api->address_to_string = &bluetooth_plugin_address_to_string;
+ api->string_to_address = &bluetooth_string_to_address;
+ return api;
+ }
+
+ testmode = 0;
+ /* check configuration */
+ if ( (GNUNET_YES ==
+ GNUNET_CONFIGURATION_have_value (env->cfg, "transport-bluetooth", "TESTMODE")) &&
+ ( (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-bluetooth",
+ "TESTMODE", &testmode)) ||
+ (testmode > 2) ) )
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "transport-wlan", "TESTMODE");
+ return NULL;
+ }
+ binary = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-transport-bluetooth");
+ if ( (0 == testmode) &&
+ (GNUNET_YES != GNUNET_OS_check_helper_binary (binary, GNUNET_YES, NULL)) )
+ {
+ LOG (GNUNET_ERROR_TYPE_ERROR,
+ _("Helper binary `%s' not SUID, cannot run WLAN transport\n"),
+ "gnunet-helper-transport-bluetooth");
+ GNUNET_free (binary);
+ return NULL;
+ }
+ GNUNET_free (binary);
+ if (GNUNET_YES !=
+ GNUNET_CONFIGURATION_get_value_string
+ (env->cfg, "transport-bluetooth", "INTERFACE",
+ &interface))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "transport-bluetooth", "INTERFACE");
+ return NULL;
+ }
+
+ plugin = GNUNET_malloc (sizeof (struct Plugin));
+ plugin->interface = interface;
+ plugin->env = env;
+ GNUNET_STATISTICS_set (plugin->env->stats, _("# Bluetooth sessions allocated"),
+ 0, GNUNET_NO);
+ GNUNET_STATISTICS_set (plugin->env->stats, _("# Bluetooth MAC endpoints allocated"),
+ 0, 0);
+ GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
+ GNUNET_BANDWIDTH_value_init (100 * 1024 *
+ 1024 / 8), 100);
+ plugin->fragment_data_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
+ plugin->wlan_header_payload_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
+ plugin->helper_payload_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
+ plugin->beacon_task = GNUNET_SCHEDULER_add_now (&send_hello_beacon,
+ plugin);
+
+ plugin->options = 0;
+
+ /* some compilers do not like switch on 'long long'... */
+ switch ((unsigned int) testmode)
+ {
+ case 0: /* normal */
+ plugin->helper_argv[0] = (char *) "gnunet-helper-transport-bluetooth";
+ plugin->helper_argv[1] = interface;
+ plugin->helper_argv[2] = NULL;
+ plugin->suid_helper = GNUNET_HELPER_start (GNUNET_NO,
+ "gnunet-helper-transport-bluetooth",
+ plugin->helper_argv,
+ &handle_helper_message,
+ NULL,
+ plugin);
+ break;
+ default:
+ GNUNET_assert (0);
+ }
+
+ api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
+ api->cls = plugin;
+ api->send = &bluetooth_plugin_send;
+ api->get_session = &bluetooth_plugin_get_session;
+ api->disconnect = &bluetooth_plugin_disconnect;
+ api->address_pretty_printer = &bluetooth_plugin_address_pretty_printer;
+ api->check_address = &bluetooth_plugin_address_suggested;
+ api->address_to_string = &bluetooth_plugin_address_to_string;;
+ api->string_to_address = &bluetooth_string_to_address;
+ api->get_network = &bluetooth_get_network;
+
+ return api;
+}
+
+
+/* end of plugin_transport_bluetooth.c */