/*
This file is part of GNUnet.
- (C) 2010 Christian Grothoff (and other contributing authors)
+ (C) 2010,2011 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 2, or (at your
+ 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
/**
* @file transport/gnunet-service-transport_blacklist.c
- * @brief low-level P2P messaging
+ * @brief blacklisting implementation
* @author Christian Grothoff
*/
#include "platform.h"
-#include "gnunet_protocols.h"
-#include "gnunet_util_lib.h"
-#include "gnunet_service_lib.h"
-#include "transport.h"
+#include "gnunet-service-transport.h"
#include "gnunet-service-transport_blacklist.h"
+#include "gnunet-service-transport_neighbours.h"
+#include "transport.h"
+
+
+/**
+ * Size of the blacklist hash map.
+ */
+#define TRANSPORT_BLACKLIST_HT_SIZE 64
+
+
+/**
+ * Context we use when performing a blacklist check.
+ */
+struct GST_BlacklistCheck;
+
+
+/**
+ * Information kept for each client registered to perform
+ * blacklisting.
+ */
+struct Blacklisters
+{
+ /**
+ * This is a linked list.
+ */
+ struct Blacklisters *next;
+
+ /**
+ * This is a linked list.
+ */
+ struct Blacklisters *prev;
+
+ /**
+ * Client responsible for this entry.
+ */
+ struct GNUNET_SERVER_Client *client;
+
+ /**
+ * Blacklist check that we're currently performing (or NULL
+ * if we're performing one that has been cancelled).
+ */
+ struct GST_BlacklistCheck *bc;
+
+ /**
+ * Set to GNUNET_YES if we're currently waiting for a reply.
+ */
+ int waiting_for_reply;
+
+};
+
+
+
+/**
+ * Context we use when performing a blacklist check.
+ */
+struct GST_BlacklistCheck
+{
+
+ /**
+ * This is a linked list.
+ */
+ struct GST_BlacklistCheck *next;
+
+ /**
+ * This is a linked list.
+ */
+ struct GST_BlacklistCheck *prev;
+
+ /**
+ * Peer being checked.
+ */
+ struct GNUNET_PeerIdentity peer;
+
+ /**
+ * Continuation to call with the result.
+ */
+ GST_BlacklistTestContinuation cont;
+
+ /**
+ * Closure for cont.
+ */
+ void *cont_cls;
+
+ /**
+ * Current transmission request handle for this client, or NULL if no
+ * request is pending.
+ */
+ struct GNUNET_CONNECTION_TransmitHandle *th;
+
+ /**
+ * Our current position in the blacklisters list.
+ */
+ struct Blacklisters *bl_pos;
+
+ /**
+ * Current task performing the check.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier task;
+
+};
+
+
+/**
+ * Head of DLL of active blacklisting queries.
+ */
+static struct GST_BlacklistCheck *bc_head;
+
+/**
+ * Tail of DLL of active blacklisting queries.
+ */
+static struct GST_BlacklistCheck *bc_tail;
+
+/**
+ * Head of DLL of blacklisting clients.
+ */
+static struct Blacklisters *bl_head;
+
+/**
+ * Tail of DLL of blacklisting clients.
+ */
+static struct Blacklisters *bl_tail;
+
+/**
+ * Hashmap of blacklisted peers. Values are of type 'char *' (transport names),
+ * can be NULL if we have no static blacklist.
+ */
+static struct GNUNET_CONTAINER_MultiHashMap *blacklist;
+
+
+/**
+ * Perform next action in the blacklist check.
+ *
+ * @param cls the 'struct BlacklistCheck*'
+ * @param tc unused
+ */
+static void
+do_blacklist_check (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
+
/**
- * Handle a request to start a blacklist.
+ * Called whenever a client is disconnected. Frees our
+ * resources associated with that client.
*
- * @param cls closure (always NULL)
+ * @param cls closure (unused)
* @param client identification of the client
- * @param message the actual message
+ */
+static void
+client_disconnect_notification (void *cls, struct GNUNET_SERVER_Client *client)
+{
+ struct Blacklisters *bl;
+ struct GST_BlacklistCheck *bc;
+
+ if (client == NULL)
+ return;
+ for (bl = bl_head; bl != NULL; bl = bl->next)
+ {
+ if (bl->client != client)
+ continue;
+ for (bc = bc_head; bc != NULL; bc = bc->next)
+ {
+ if (bc->bl_pos != bl)
+ continue;
+ bc->bl_pos = bl->next;
+ if (bc->th != NULL)
+ {
+ GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
+ bc->th = NULL;
+ }
+ if (bc->task == GNUNET_SCHEDULER_NO_TASK)
+ bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check, bc);
+ break;
+ }
+ GNUNET_CONTAINER_DLL_remove (bl_head, bl_tail, bl);
+ GNUNET_SERVER_client_drop (bl->client);
+ GNUNET_free (bl);
+ break;
+ }
+}
+
+
+/**
+ * Read the blacklist file, containing transport:peer entries.
+ * Provided the transport is loaded, set up hashmap with these
+ * entries to blacklist peers by transport.
+ *
+ */
+static void
+read_blacklist_file ()
+{
+ char *fn;
+ char *data;
+ size_t pos;
+ size_t colon_pos;
+ int tsize;
+ struct GNUNET_PeerIdentity pid;
+ struct stat frstat;
+ struct GNUNET_CRYPTO_HashAsciiEncoded enc;
+ unsigned int entries_found;
+ char *transport_name;
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_filename (GST_cfg,
+ "TRANSPORT",
+ "BLACKLIST_FILE", &fn))
+ {
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Option `%s' in section `%s' not specified!\n",
+ "BLACKLIST_FILE", "TRANSPORT");
+#endif
+ return;
+ }
+ if (GNUNET_OK != GNUNET_DISK_file_test (fn))
+ GNUNET_DISK_fn_write (fn, NULL, 0,
+ GNUNET_DISK_PERM_USER_READ |
+ GNUNET_DISK_PERM_USER_WRITE);
+ if (0 != STAT (fn, &frstat))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Could not read blacklist file `%s'\n"), fn);
+ GNUNET_free (fn);
+ return;
+ }
+ if (frstat.st_size == 0)
+ {
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ _("Blacklist file `%s' is empty.\n"), fn);
+#endif
+ GNUNET_free (fn);
+ return;
+ }
+ /* FIXME: use mmap */
+ data = GNUNET_malloc_large (frstat.st_size);
+ GNUNET_assert (data != NULL);
+ if (frstat.st_size != GNUNET_DISK_fn_read (fn, data, frstat.st_size))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to read blacklist from `%s'\n"), fn);
+ GNUNET_free (fn);
+ GNUNET_free (data);
+ return;
+ }
+ entries_found = 0;
+ pos = 0;
+ while ((pos < frstat.st_size) && isspace ((unsigned char) data[pos]))
+ pos++;
+ while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
+ (pos <=
+ frstat.st_size - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
+ {
+ colon_pos = pos;
+ while ((colon_pos < frstat.st_size) &&
+ (data[colon_pos] != ':') &&
+ (!isspace ((unsigned char) data[colon_pos])))
+ colon_pos++;
+ if (colon_pos >= frstat.st_size)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _
+ ("Syntax error in blacklist file at offset %llu, giving up!\n"),
+ (unsigned long long) colon_pos);
+ GNUNET_free (fn);
+ GNUNET_free (data);
+ return;
+ }
+
+ if (isspace ((unsigned char) data[colon_pos]))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _
+ ("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
+ (unsigned long long) colon_pos);
+ pos = colon_pos;
+ while ((pos < frstat.st_size) && isspace ((unsigned char) data[pos]))
+ pos++;
+ continue;
+ }
+ tsize = colon_pos - pos;
+ if ((pos >= frstat.st_size) || (pos + tsize >= frstat.st_size) ||
+ (tsize == 0))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _
+ ("Syntax error in blacklist file at offset %llu, giving up!\n"),
+ (unsigned long long) colon_pos);
+ GNUNET_free (fn);
+ GNUNET_free (data);
+ return;
+ }
+
+ if (tsize < 1)
+ continue;
+
+ transport_name = GNUNET_malloc (tsize + 1);
+ memcpy (transport_name, &data[pos], tsize);
+ pos = colon_pos + 1;
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Read transport name `%s' in blacklist file.\n",
+ transport_name);
+#endif
+ memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
+ if (!isspace
+ ((unsigned char)
+ enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _
+ ("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
+ (unsigned long long) pos);
+ pos++;
+ while ((pos < frstat.st_size) && (!isspace ((unsigned char) data[pos])))
+ pos++;
+ GNUNET_free_non_null (transport_name);
+ continue;
+ }
+ enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
+ if (GNUNET_OK !=
+ GNUNET_CRYPTO_hash_from_string ((char *) &enc, &pid.hashPubKey))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _
+ ("Syntax error in blacklist file at offset %llu, skipping bytes `%s'.\n"),
+ (unsigned long long) pos, &enc);
+ }
+ else
+ {
+ if (0 != memcmp (&pid,
+ &GST_my_identity, sizeof (struct GNUNET_PeerIdentity)))
+ {
+ entries_found++;
+ GST_blacklist_add_peer (&pid, transport_name);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Found myself `%s' in blacklist (useless, ignored)\n"),
+ GNUNET_i2s (&pid));
+ }
+ }
+ pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
+ GNUNET_free_non_null (transport_name);
+ while ((pos < frstat.st_size) && isspace ((unsigned char) data[pos]))
+ pos++;
+ }
+ GNUNET_STATISTICS_update (GST_stats,
+ "# Transport entries blacklisted",
+ entries_found, GNUNET_NO);
+ GNUNET_free (data);
+ GNUNET_free (fn);
+}
+
+
+/**
+ * Start blacklist subsystem.
+ *
+ * @param server server used to accept clients from
+ */
+void
+GST_blacklist_start (struct GNUNET_SERVER_Handle *server)
+{
+ read_blacklist_file ();
+ GNUNET_SERVER_disconnect_notify (server,
+ &client_disconnect_notification, NULL);
+}
+
+
+/**
+ * Free the given entry in the blacklist.
+ *
+ * @param cls unused
+ * @param key host identity (unused)
+ * @param value the blacklist entry
+ * @return GNUNET_OK (continue to iterate)
+ */
+static int
+free_blacklist_entry (void *cls, const GNUNET_HashCode * key, void *value)
+{
+ char *be = value;
+
+ GNUNET_free (be);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Stop blacklist subsystem.
+ */
+void
+GST_blacklist_stop ()
+{
+ if (NULL != blacklist)
+ {
+ GNUNET_CONTAINER_multihashmap_iterate (blacklist,
+ &free_blacklist_entry, NULL);
+ GNUNET_CONTAINER_multihashmap_destroy (blacklist);
+ blacklist = NULL;
+ }
+}
+
+
+/**
+ * Transmit blacklist query to the client.
+ *
+ * @param cls the 'struct GST_BlacklistCheck'
+ * @param size number of bytes allowed
+ * @param buf where to copy the message
+ * @return number of bytes copied to buf
+ */
+static size_t
+transmit_blacklist_message (void *cls, size_t size, void *buf)
+{
+ struct GST_BlacklistCheck *bc = cls;
+ struct Blacklisters *bl;
+ struct BlacklistMessage bm;
+
+ bc->th = NULL;
+ if (size == 0)
+ {
+ GNUNET_assert (bc->task == GNUNET_SCHEDULER_NO_TASK);
+ bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check, bc);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Failed to send blacklist test for peer `%s' to client\n",
+ GNUNET_i2s (&bc->peer));
+ return 0;
+ }
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending blacklist test for peer `%s' to client\n",
+ GNUNET_i2s (&bc->peer));
+#endif
+ bl = bc->bl_pos;
+ bm.header.size = htons (sizeof (struct BlacklistMessage));
+ bm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
+ bm.is_allowed = htonl (0);
+ bm.peer = bc->peer;
+ memcpy (buf, &bm, sizeof (bm));
+ GNUNET_SERVER_receive_done (bl->client, GNUNET_OK);
+ bl->waiting_for_reply = GNUNET_YES;
+ return sizeof (bm);
+}
+
+
+/**
+ * Perform next action in the blacklist check.
+ *
+ * @param cls the 'struct GST_BlacklistCheck*'
+ * @param tc unused
+ */
+static void
+do_blacklist_check (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GST_BlacklistCheck *bc = cls;
+ struct Blacklisters *bl;
+
+ bc->task = GNUNET_SCHEDULER_NO_TASK;
+ bl = bc->bl_pos;
+ if (bl == NULL)
+ {
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "No other blacklist clients active, will allow neighbour `%s'\n",
+ GNUNET_i2s (&bc->peer));
+#endif
+ bc->cont (bc->cont_cls, &bc->peer, GNUNET_OK);
+ GNUNET_free (bc);
+ return;
+ }
+ if ((bl->bc != NULL) || (bl->waiting_for_reply != GNUNET_NO))
+ return; /* someone else busy with this client */
+ bl->bc = bc;
+ bc->th = GNUNET_SERVER_notify_transmit_ready (bl->client,
+ sizeof (struct
+ BlacklistMessage),
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ &transmit_blacklist_message,
+ bc);
+}
+
+
+/**
+ * Got the result about an existing connection from a new blacklister.
+ * Shutdown the neighbour if necessary.
+ *
+ * @param cls unused
+ * @param peer the neighbour that was investigated
+ * @param allowed GNUNET_OK if we can keep it,
+ * GNUNET_NO if we must shutdown the connection
+ */
+static void
+confirm_or_drop_neighbour (void *cls,
+ const struct GNUNET_PeerIdentity *peer, int allowed)
+{
+ if (GNUNET_OK == allowed)
+ return; /* we're done */
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop ("# disconnects due to blacklist"),
+ 1, GNUNET_NO);
+ GST_neighbours_force_disconnect (peer);
+}
+
+
+/**
+ * Closure for 'test_connection_ok'.
+ */
+struct TestConnectionContext
+{
+ /**
+ * Is this the first neighbour we're checking?
+ */
+ int first;
+
+ /**
+ * Handle to the blacklisting client we need to ask.
+ */
+ struct Blacklisters *bl;
+};
+
+
+/**
+ * Test if an existing connection is still acceptable given a new
+ * blacklisting client.
+ *
+ * @param cls the 'struct TestConnectionContest'
+ * @param pid neighbour's identity
+ * @param ats performance data
+ * @param ats_count number of entries in ats (excluding 0-termination)
+ */
+static void
+test_connection_ok (void *cls,
+ const struct GNUNET_PeerIdentity *neighbour,
+ const struct GNUNET_TRANSPORT_ATS_Information *ats,
+ uint32_t ats_count)
+{
+ struct TestConnectionContext *tcc = cls;
+ struct GST_BlacklistCheck *bc;
+
+ bc = GNUNET_malloc (sizeof (struct GST_BlacklistCheck));
+ GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
+ bc->peer = *neighbour;
+ bc->cont = &confirm_or_drop_neighbour;
+ bc->cont_cls = NULL;
+ bc->bl_pos = tcc->bl;
+ if (GNUNET_YES == tcc->first)
+ {
+ /* all would wait for the same client, no need to
+ * create more than just the first task right now */
+ bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check, bc);
+ tcc->first = GNUNET_NO;
+ }
+}
+
+
+
+/**
+ * Initialize a blacklisting client. We got a blacklist-init
+ * message from this client, add him to the list of clients
+ * to query for blacklisting.
+ *
+ * @param cls unused
+ * @param client the client
+ * @param message the blacklist-init message that was sent
*/
void
-GNUNET_TRANSPORT_handle_blacklist_init (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
+GST_blacklist_handle_init (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
{
struct Blacklisters *bl;
+ struct TestConnectionContext tcc;
+ bl = bl_head;
+ while (bl != NULL)
+ {
+ if (bl->client == client)
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ bl = bl->next;
+ }
bl = GNUNET_malloc (sizeof (struct Blacklisters));
bl->client = client;
GNUNET_SERVER_client_keep (client);
- GNUNET_CONTAINER_DLL_insert (bl_head, bl_tail, bl);
- /* FIXME: confirm that all existing connections are OK! */
+ GNUNET_CONTAINER_DLL_insert_after (bl_head, bl_tail, bl_tail, bl);
+
+ /* confirm that all existing connections are OK! */
+ tcc.bl = bl;
+ tcc.first = GNUNET_YES;
+ GST_neighbours_iterate (&test_connection_ok, &tcc);
}
/**
- * Handle a request to blacklist a peer.
+ * A blacklisting client has sent us reply. Process it.
*
- * @param cls closure (always NULL)
- * @param client identification of the client
- * @param message the actual message
+ * @param cls unused
+ * @param client the client
+ * @param message the blacklist-init message that was sent
*/
void
-GNUNET_TRANSPORT_handle_blacklist_reply (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
+GST_blacklist_handle_reply (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
{
+ const struct BlacklistMessage *msg =
+ (const struct BlacklistMessage *) message;
struct Blacklisters *bl;
- const struct BlacklistMessage *msg = (const struct BlacklistMessage*) message;
+ struct GST_BlacklistCheck *bc;
bl = bl_head;
- while ( (bl != NULL) &&
- (bl->client != client) )
+ while ((bl != NULL) && (bl->client != client))
bl = bl->next;
if (bl == NULL)
+ {
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Blacklist client disconnected\n");
+#endif
+ /* FIXME: other error handling here!? */
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ bc = bl->bc;
+ bl->bc = NULL;
+ bl->waiting_for_reply = GNUNET_NO;
+ if (NULL != bc)
+ {
+ /* only run this if the blacklist check has not been
+ * cancelled in the meantime... */
+ if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
{
- GNUNET_SERVER_client_done (client, GNUNET_SYSERR);
- return;
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Blacklist check failed, peer not allowed\n");
+#endif
+ bc->cont (bc->cont_cls, &bc->peer, GNUNET_NO);
+ GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
+ GNUNET_free (bc);
+ }
+ else
+ {
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Blacklist check succeeded, continuing with checks\n");
+#endif
+ bc->bl_pos = bc->bl_pos->next;
+ bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check, bc);
}
- if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
- {
- be = GNUNET_malloc (sizeof (struct BlacklistEntry));
- be->peer = msg->peer;
- be->client = client;
- GNUNET_CONTAINER_multihashmap_put (blacklist,
- &msg->peer.hashPubKey,
- be,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
+ }
+ /* check if any other bc's are waiting for this blacklister */
+ bc = bc_head;
+ for (bc = bc_head; bc != NULL; bc = bc->next)
+ if ((bc->bl_pos == bl) && (GNUNET_SCHEDULER_NO_TASK == bc->task))
+ {
+ bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check, bc);
+ break;
}
- /* FIXME: trigger continuation... */
}
/**
- * Notify the given client about all entries in the blacklist.
- *
- * @param cls closure, refers to the 'struct GNUNET_SERVER_Client' to notify
- * @param key current key code (peer identity, not used)
- * @param value value in the hash map, the 'struct BlacklistEntry*'
- * @return GNUNET_YES (continue to iterate)
+ * Add the given peer to the blacklist (for the given transport).
+ *
+ * @param peer peer to blacklist
+ * @param transport_name transport to blacklist for this peer, NULL for all
*/
-static int
-notify_blacklist_entry (void *cls,
- const GNUNET_HashCode *key,
- void *value)
-{
- struct GNUNET_SERVER_Client *client = cls;
- struct BlacklistEntry *be = value;
- struct BlacklistMessage msg;
-
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST);
- msg.header.size = htons (sizeof (struct BlacklistMessage));
- msg.reserved = htonl (0);
- msg.peer = be->peer;
- msg.until = GNUNET_TIME_absolute_hton (be->until);
- GNUNET_SERVER_notification_context_unicast (blacklist_notifiers,
- client,
- &msg.header,
- GNUNET_NO);
- return GNUNET_YES;
+void
+GST_blacklist_add_peer (const struct GNUNET_PeerIdentity *peer,
+ const char *transport_name)
+{
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Adding peer `%s' with plugin `%s' to blacklist\n",
+ GNUNET_i2s (peer), transport_name);
+#endif
+ if (blacklist == NULL)
+ blacklist =
+ GNUNET_CONTAINER_multihashmap_create (TRANSPORT_BLACKLIST_HT_SIZE);
+ GNUNET_CONTAINER_multihashmap_put (blacklist, &peer->hashPubKey,
+ GNUNET_strdup (transport_name),
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
}
/**
- * Handle a request for notification of blacklist changes.
+ * Test if the given blacklist entry matches. If so,
+ * abort the iteration.
*
- * @param cls closure (always NULL)
- * @param client identification of the client
- * @param message the actual message
+ * @param cls the transport name to match (const char*)
+ * @param key the key (unused)
+ * @param value the 'char *' (name of a blacklisted transport)
+ * @return GNUNET_OK if the entry does not match, GNUNET_NO if it matches
*/
-void
-GNUNET_TRANSPORT_handle_blacklist_notify (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
-{
- GNUNET_SERVER_notification_context_add (blacklist_notifiers, client);
- GNUNET_CONTAINER_multihashmap_iterate (blacklist,
- ¬ify_blacklist_entry,
- client);
+static int
+test_blacklisted (void *cls, const GNUNET_HashCode * key, void *value)
+{
+ const char *transport_name = cls;
+ char *be = value;
+
+ if (0 == strcmp (transport_name, be))
+ return GNUNET_NO; /* abort iteration! */
+ return GNUNET_OK;
}
/**
- * Is the given peer currently blacklisted?
+ * Test if a peer/transport combination is blacklisted.
*
- * @param id identity of the peer
- * @return GNUNET_YES if the peer is blacklisted, GNUNET_NO if not
+ * @param peer the identity of the peer to test
+ * @param transport_name name of the transport to test, never NULL
+ * @param cont function to call with result
+ * @param cont_cls closure for 'cont'
+ * @return handle to the blacklist check, NULL if the decision
+ * was made instantly and 'cont' was already called
*/
-int
-GNUNET_TRANSPORT_blacklist_check (const struct GNUNET_PeerIdentity *id)
+struct GST_BlacklistCheck *
+GST_blacklist_test_allowed (const struct GNUNET_PeerIdentity *peer,
+ const char *transport_name,
+ GST_BlacklistTestContinuation cont, void *cont_cls)
{
- if (GNUNET_CONTAINER_multihashmap_contains (blacklist, &id->hashPubKey))
- return GNUNET_YES;
-
+ struct GST_BlacklistCheck *bc;
+
+ if ((blacklist != NULL) &&
+ (GNUNET_SYSERR ==
+ GNUNET_CONTAINER_multihashmap_get_multiple (blacklist,
+ &peer->hashPubKey,
+ &test_blacklisted,
+ (void *) transport_name)))
+ {
+ /* disallowed by config, disapprove instantly */
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop ("# disconnects due to blacklist"),
+ 1, GNUNET_NO);
+ if (cont != NULL)
+ cont (cont_cls, peer, GNUNET_NO);
+ return NULL;
+ }
+
+ if (bl_head == NULL)
+ {
+ /* no blacklist clients, approve instantly */
+ if (cont != NULL)
+ cont (cont_cls, peer, GNUNET_OK);
+ return NULL;
+ }
+
+ /* need to query blacklist clients */
+ bc = GNUNET_malloc (sizeof (struct GST_BlacklistCheck));
+ GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
+ bc->peer = *peer;
+ bc->cont = cont;
+ bc->cont_cls = cont_cls;
+ bc->bl_pos = bl_head;
+ bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check, bc);
+ return bc;
}
/**
- * Initialize the blacklisting subsystem.
- *
- * @param server server of the transport service
- * @param s scheduler to use
- */
-void
-GNUNET_TRANSPORT_blacklist_init (struct GNUNET_SERVER_Handle *server,
- struct GNUNET_SCHEDULER_Handle *s)
-{
- sched = s;
- blacklist = GNUNET_CONTAINER_multihashmap_create (4);
- GNUNET_SCHEDULER_add_delayed (sched,
- GNUNET_TIME_UNIT_FOREVER_REL,
- &shutdown_task,
- NULL);
+ * Cancel a blacklist check.
+ *
+ * @param bc check to cancel
+ */
+void
+GST_blacklist_test_cancel (struct GST_BlacklistCheck *bc)
+{
+ GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
+ if (bc->bl_pos != NULL)
+ {
+ if (bc->bl_pos->bc == bc)
+ {
+ /* we're at the head of the queue, remove us! */
+ bc->bl_pos->bc = NULL;
+ }
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != bc->task)
+ {
+ GNUNET_SCHEDULER_cancel (bc->task);
+ bc->task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (NULL != bc->th)
+ {
+ GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
+ bc->th = NULL;
+ }
+ GNUNET_free (bc);
}
-/* end of gnunet-service-transport_blacklist.c */
+/* end of file gnunet-service-transport_blacklist.c */
projects / oweals / gnunet.git / blobdiff