/*
This file is part of GNUnet.
- (C) 2010,2011 Christian Grothoff (and other contributing authors)
+ (C) 2010-2013 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
#include "gnunet-service-transport_validation.h"
#include "gnunet-service-transport_plugins.h"
#include "gnunet-service-transport_hello.h"
+#include "gnunet-service-transport_blacklist.h"
#include "gnunet-service-transport.h"
#include "gnunet_hello_lib.h"
+#include "gnunet_ats_service.h"
#include "gnunet_peerinfo_service.h"
#include "gnunet_signatures.h"
-// TODO: observe latency between PING/PONG and give information to ATS!
/**
* How long is a PONG signature valid? We'll recycle a signature until
#define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
/**
- * How long before an existing address expires should we again try to
- * validate it? Must be (significantly) smaller than
- * HELLO_ADDRESS_EXPIRATION.
+ * How often do we allow PINGing an address that we have not yet
+ * validated? This also determines how long we track an address that
+ * we cannot validate (because after this time we can destroy the
+ * validation record).
*/
-#define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
+#define UNVALIDATED_PING_KEEPALIVE GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
+
+/**
+ * How often do we PING an address that we have successfully validated
+ * in the past but are not actively using? Should be (significantly)
+ * smaller than HELLO_ADDRESS_EXPIRATION.
+ */
+#define VALIDATED_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
+
+/**
+ * How often do we PING an address that we are currently using?
+ */
+#define CONNECTED_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
+
+/**
+ * How much delay is acceptable for sending the PING or PONG?
+ */
+#define ACCEPTABLE_PING_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
/**
* Size of the validation map hashmap.
/**
* Priority to use for PINGs
- */
+ */
#define PING_PRIORITY 2
/**
* Priority to use for PONGs
- */
+ */
#define PONG_PRIORITY 4
+GNUNET_NETWORK_STRUCT_BEGIN
+
/**
* Message used to ask a peer to validate receipt (to check an address
* from a HELLO). Followed by the address we are trying to validate,
/**
* Signature.
*/
- struct GNUNET_CRYPTO_RsaSignature signature;
+ struct GNUNET_CRYPTO_EccSignature signature;
/**
- * What are we signing and why? Two possible reason codes can be here:
* GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN to confirm that this is a
- * plausible address for this peer (pid is set to identity of signer); or
- * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING to confirm that this is
- * an address we used to connect to the peer with the given pid.
+ * plausible address for the signing peer.
*/
- struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
+ struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
/**
* When does this signature expire?
*/
struct GNUNET_TIME_AbsoluteNBO expiration;
- /**
- * Either the identity of the peer Who signed this message, or the
- * identity of the peer that we're connected to using the given
- * address (depending on purpose.type).
- */
- struct GNUNET_PeerIdentity pid;
-
/**
* Size of address appended to this message (part of what is
* being signed, hence not redundant).
uint32_t addrlen GNUNET_PACKED;
};
-
+GNUNET_NETWORK_STRUCT_END
/**
* Information about an address under validation
*/
-struct ValidationEntry
+struct ValidationEntry
{
/**
- * Name of the transport.
+ * The address.
*/
- char *transport_name;
+ struct GNUNET_HELLO_Address *address;
/**
- * The address, actually a pointer to the end
- * of this struct. Do not free!
+ * Handle to the blacklist check (if we're currently in it).
*/
- const void *addr;
+ struct GST_BlacklistCheck *bc;
/**
* Public key of the peer.
*/
- struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
+ struct GNUNET_CRYPTO_EccPublicKey public_key;
/**
- * The identity of the peer.
+ * The identity of the peer. FIXME: duplicated (also in 'address')
*/
struct GNUNET_PeerIdentity pid;
+ /**
+ * Cached PONG signature
+ */
+ struct GNUNET_CRYPTO_EccSignature pong_sig_cache;
+
/**
* ID of task that will clean up this entry if nothing happens.
*/
GNUNET_SCHEDULER_TaskIdentifier timeout_task;
/**
- * At what time did we send the latest validation request?
+ * ID of task that will trigger address revalidation.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier revalidation_task;
+
+ /**
+ * At what time did we send the latest validation request (PING)?
*/
struct GNUNET_TIME_Absolute send_time;
*/
struct GNUNET_TIME_Absolute valid_until;
+ /**
+ * Until when is the cached PONG signature valid?
+ * ZERO if it is not currently considered valid.
+ */
+ struct GNUNET_TIME_Absolute pong_sig_valid_until;
+
/**
* How long until we can try to validate this address again?
* FOREVER if the address is for an unsupported plugin (from PEERINFO)
* ZERO if the address is considered valid (no validation needed)
* otherwise a time in the future if we're currently denying re-validation
*/
- struct GNUNET_TIME_Absolute validation_block;
-
+ struct GNUNET_TIME_Absolute revalidation_block;
+
+ /**
+ * Last observed latency for this address (round-trip), delay between
+ * last PING sent and PONG received; FOREVER if we never got a PONG.
+ */
+ struct GNUNET_TIME_Relative latency;
+
/**
* Challenge number we used.
*/
uint32_t challenge;
/**
- * Length of addr.
+ * When passing the address in 'add_valid_peer_address', did we
+ * copy the address to the HELLO yet?
*/
- size_t addrlen;
+ int copied;
+ /**
+ * Are we currently using this address for a connection?
+ */
+ int in_use;
+
+ /**
+ * Are we expecting a PONG message for this validation entry?
+ */
+ int expecting_pong;
+
+ /* FIXME: DEBUGGING */
+ int last_line_set_to_no;
+ int last_line_set_to_yes;
+
+ enum GNUNET_ATS_Network_Type network;
};
};
-/**
- * Opaque handle to stop incremental validation address callbacks.
- */
-struct GST_ValidationIteratorContext
-{
- /**
- * Function to call on each address.
- */
- GST_ValidationAddressCallback cb;
-
- /**
- * Closure for 'cb'.
- */
- void *cb_cls;
-
- /**
- * Which peer are we monitoring?
- */
- struct GNUNET_PeerIdentity target;
-};
-
-
/**
* Head of linked list of HELLOs awaiting validation.
*/
static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
/**
- * Map of PeerIdentities to 'struct GST_ValidationIteratorContext's.
+ * Context for peerinfo iteration.
*/
-static struct GNUNET_CONTAINER_MultiHashMap *notify_map;
+static struct GNUNET_PEERINFO_NotifyContext *pnc;
+
/**
- * Context for peerinfo iteration.
+ * Minimum delay between to validations
*/
-static struct GNUNET_PEERINFO_NotifyContext *pnc;
+static struct GNUNET_TIME_Relative validation_delay;
+
+/**
+ * Number of validations running
+ */
+static unsigned int validations_running;
+
+/**
+ * Validition fast start threshold
+ */
+static unsigned int validations_fast_start_threshold;
+/**
+ * When is next validation allowed
+ */
+static struct GNUNET_TIME_Absolute validation_next;
/**
* Context for the validation entry match function.
* Where to store the result?
*/
struct ValidationEntry *ve;
-
- /**
- * Transport name we're looking for.
- */
- const char *transport_name;
/**
* Address we're interested in.
*/
- const char *addr;
+ const struct GNUNET_HELLO_Address *address;
- /**
- * Number of bytes in 'addr'.
- */
- size_t addrlen;
};
* GNUNET_NO if the entry does match
*/
static int
-validation_entry_match (void *cls,
- const GNUNET_HashCode *key,
- void *value)
+validation_entry_match (void *cls, const struct GNUNET_HashCode * key, void *value)
{
struct ValidationEntryMatchContext *vemc = cls;
struct ValidationEntry *ve = value;
- if ( (ve->addrlen == vemc->addrlen) &&
- (0 == memcmp (ve->addr, vemc->addr, ve->addrlen)) &&
- (0 == strcmp (ve->transport_name, vemc->transport_name)) )
+ if (0 == GNUNET_HELLO_address_cmp (ve->address, vemc->address))
+ {
+ vemc->ve = ve;
+ return GNUNET_NO;
+ }
+ return GNUNET_YES;
+}
+
+
+/**
+ * Iterate over validation entries and free them.
+ *
+ * @param cls (unused)
+ * @param key peer identity (unused)
+ * @param value a 'struct ValidationEntry' to clean up
+ * @return GNUNET_YES (continue to iterate)
+ */
+static int
+cleanup_validation_entry (void *cls, const struct GNUNET_HashCode * key, void *value)
+{
+ struct ValidationEntry *ve = value;
+
+ if (NULL != ve->bc)
+ {
+ GST_blacklist_test_cancel (ve->bc);
+ ve->bc = NULL;
+ }
+ GNUNET_break (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_remove (validation_map,
+ &ve->pid.hashPubKey, ve));
+ GNUNET_HELLO_address_free (ve->address);
+ if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
+ {
+ GNUNET_SCHEDULER_cancel (ve->timeout_task);
+ ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != ve->revalidation_task)
+ {
+ GNUNET_SCHEDULER_cancel (ve->revalidation_task);
+ ve->revalidation_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if ((GNUNET_YES == ve->expecting_pong) &&
+ (validations_running > 0))
+ {
+ validations_running --;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Validation finished, %u validation processes running\n",
+ validations_running);
+ }
+ GNUNET_free (ve);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Address validation cleanup task. Assesses if the record is no
+ * longer valid and then possibly triggers its removal.
+ *
+ * @param cls the 'struct ValidationEntry'
+ * @param tc scheduler context (unused)
+ */
+static void
+timeout_hello_validation (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct ValidationEntry *ve = cls;
+ struct GNUNET_TIME_Absolute max;
+ struct GNUNET_TIME_Relative left;
+
+ ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ max = GNUNET_TIME_absolute_max (ve->valid_until, ve->revalidation_block);
+ left = GNUNET_TIME_absolute_get_remaining (max);
+ if (left.rel_value_us > 0)
+ {
+ /* should wait a bit longer */
+ ve->timeout_task =
+ GNUNET_SCHEDULER_add_delayed (left, &timeout_hello_validation, ve);
+ return;
+ }
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop ("# address records discarded"), 1,
+ GNUNET_NO);
+ cleanup_validation_entry (NULL, &ve->pid.hashPubKey, ve);
+}
+
+
+/**
+ * Function called with the result from blacklisting.
+ * Send a PING to the other peer if a communication is allowed.
+ *
+ * @param cls our 'struct ValidationEntry'
+ * @param pid identity of the other peer
+ * @param result GNUNET_OK if the connection is allowed, GNUNET_NO if not
+ */
+static void
+transmit_ping_if_allowed (void *cls, const struct GNUNET_PeerIdentity *pid,
+ int result)
+{
+ struct ValidationEntry *ve = cls;
+ struct TransportPingMessage ping;
+ struct GNUNET_TRANSPORT_PluginFunctions *papi;
+ struct GNUNET_TIME_Absolute next;
+ const struct GNUNET_MessageHeader *hello;
+ enum GNUNET_ATS_Network_Type network;
+ ssize_t ret;
+ size_t tsize;
+ size_t slen;
+ uint16_t hsize;
+
+ ve->bc = NULL;
+
+ if (GNUNET_NO == result)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Blacklist denies to send PING to `%s' %s %s\n",
+ GNUNET_i2s (pid), GST_plugins_a2s (ve->address), ve->address->transport_name);
+ return;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitting plain PING to `%s' %s %s\n",
+ GNUNET_i2s (pid), GST_plugins_a2s (ve->address), ve->address->transport_name);
+
+ next = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(), validation_delay);
+ if (next.abs_value_us > validation_next.abs_value_us)
+ validation_next = next; /* We're going to send a PING so delay next validation */
+
+ slen = strlen (ve->address->transport_name) + 1;
+ hello = GST_hello_get ();
+ hsize = ntohs (hello->size);
+ tsize =
+ sizeof (struct TransportPingMessage) + ve->address->address_length +
+ slen + hsize;
+
+ ping.header.size =
+ htons (sizeof (struct TransportPingMessage) +
+ ve->address->address_length + slen);
+ ping.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
+ ping.challenge = htonl (ve->challenge);
+ ping.target = *pid;
+
+ if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("Not transmitting `%s' with `%s', message too big (%u bytes!). This should not happen.\n"),
+ "HELLO", "PING", (unsigned int) tsize);
+ /* message too big (!?), get rid of HELLO */
+ hsize = 0;
+ tsize =
+ sizeof (struct TransportPingMessage) + ve->address->address_length +
+ slen + hsize;
+ }
+ {
+ char message_buf[tsize];
+
+ /* build message with structure:
+ * [HELLO][TransportPingMessage][Transport name][Address] */
+ memcpy (message_buf, hello, hsize);
+ memcpy (&message_buf[hsize], &ping, sizeof (struct TransportPingMessage));
+ memcpy (&message_buf[sizeof (struct TransportPingMessage) + hsize],
+ ve->address->transport_name, slen);
+ memcpy (&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
+ ve->address->address, ve->address->address_length);
+ papi = GST_plugins_find (ve->address->transport_name);
+ if (papi == NULL)
+ ret = -1;
+ else
{
- vemc->ve = ve;
- return GNUNET_NO;
+ GNUNET_assert (papi->send != NULL);
+ GNUNET_assert (papi->get_session != NULL);
+ struct Session * session = papi->get_session(papi->cls, ve->address);
+
+ if (session != NULL)
+ {
+ ret = papi->send (papi->cls, session,
+ message_buf, tsize,
+ PING_PRIORITY, ACCEPTABLE_PING_DELAY,
+ NULL, NULL);
+ network = papi->get_network (ve->address, session);
+ if (GNUNET_ATS_NET_UNSPECIFIED == network)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Could not obtain a valid network for `%s' %s\n",
+ GNUNET_i2s (pid), GST_plugins_a2s (ve->address));
+ GNUNET_break (0);
+ }
+ }
+ else
+ {
+ /* Could not get a valid session */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Could not get a valid session for `%s' %s\n",
+ GNUNET_i2s (pid), GST_plugins_a2s (ve->address));
+ ret = -1;
+ }
}
- return GNUNET_YES;
+ }
+ if (-1 != ret)
+ {
+ ve->send_time = GNUNET_TIME_absolute_get ();
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop
+ ("# PING without HELLO messages sent"), 1,
+ GNUNET_NO);
+
+ ve->network = network;
+ ve->expecting_pong = GNUNET_YES;
+ validations_running ++;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Validation started, %u validation processes running\n",
+ validations_running);
+ }
+}
+
+
+/**
+ * Do address validation again to keep address valid.
+ *
+ * @param cls the 'struct ValidationEntry'
+ * @param tc scheduler context (unused)
+ */
+static void
+revalidate_address (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct ValidationEntry *ve = cls;
+ struct GNUNET_TIME_Relative canonical_delay;
+ struct GNUNET_TIME_Relative delay;
+ struct GNUNET_TIME_Relative blocked_for;
+ struct GST_BlacklistCheck *bc;
+ uint32_t rdelay;
+
+ ve->revalidation_task = GNUNET_SCHEDULER_NO_TASK;
+ delay = GNUNET_TIME_absolute_get_remaining (ve->revalidation_block);
+ /* How long until we can possibly permit the next PING? */
+ canonical_delay =
+ (ve->in_use ==
+ GNUNET_YES) ? CONNECTED_PING_FREQUENCY
+ : ((GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value_us >
+ 0) ? VALIDATED_PING_FREQUENCY : UNVALIDATED_PING_KEEPALIVE);
+ if (delay.rel_value_us > canonical_delay.rel_value_us * 2)
+ {
+ /* situation changed, recalculate delay */
+ delay = canonical_delay;
+ ve->revalidation_block = GNUNET_TIME_relative_to_absolute (delay);
+ }
+ if (delay.rel_value_us > 0)
+ {
+ /* should wait a bit longer */
+ ve->revalidation_task =
+ GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
+ return;
+ }
+ blocked_for = GNUNET_TIME_absolute_get_remaining(validation_next);
+ if ((validations_running > validations_fast_start_threshold) &&
+ (blocked_for.rel_value_us > 0))
+ {
+ /* Validations are blocked, have to wait for blocked_for time */
+ ve->revalidation_task =
+ GNUNET_SCHEDULER_add_delayed (blocked_for, &revalidate_address, ve);
+ return;
+ }
+ ve->revalidation_block = GNUNET_TIME_relative_to_absolute (canonical_delay);
+
+ /* schedule next PINGing with some extra random delay to avoid synchronous re-validations */
+ rdelay =
+ GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+ canonical_delay.rel_value_us);
+
+ /* Debug code for mantis 0002726 */
+ if (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us ==
+ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MICROSECONDS, rdelay).rel_value_us)
+ {
+ GNUNET_break (0);
+ delay = canonical_delay;
+ }
+ else
+ {
+ delay = GNUNET_TIME_relative_add (canonical_delay,
+ GNUNET_TIME_relative_multiply
+ (GNUNET_TIME_UNIT_MICROSECONDS, rdelay));
+ }
+ /* End debug code for mantis 0002726*/
+ ve->revalidation_task =
+ GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
+
+ /* start PINGing by checking blacklist */
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop ("# address revalidations started"), 1,
+ GNUNET_NO);
+ bc = GST_blacklist_test_allowed (&ve->pid, ve->address->transport_name,
+ &transmit_ping_if_allowed, ve);
+ if (NULL != bc)
+ ve->bc = bc; /* only set 'bc' if 'transmit_ping_if_allowed' was not already
+ * called... */
}
* without starting any validation).
*
* @param public_key public key of the peer, NULL for unknown
- * @param neighbour which peer we care about
- * @param tname name of the transport plugin
- * @param session session to look for, NULL for 'any'; otherwise
- * can be used for the service to "learn" this session ID
- * if 'addr' matches
- * @param addr binary address
- * @param addrlen length of addr
+ * @param address address to find
* @return validation entry matching the given specifications, NULL
* if we don't have an existing entry and no public key was given
*/
static struct ValidationEntry *
-find_validation_entry (const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key,
- const struct GNUNET_PeerIdentity *neighbour,
- const char *tname,
- const char *addr,
- size_t addrlen)
+find_validation_entry (const struct GNUNET_CRYPTO_EccPublicKey *public_key,
+ const struct GNUNET_HELLO_Address *address)
{
struct ValidationEntryMatchContext vemc;
struct ValidationEntry *ve;
vemc.ve = NULL;
- vemc.transport_name = tname;
- vemc.addr = addr;
- vemc.addrlen = addrlen;
+ vemc.address = address;
GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
- &neighbour->hashPubKey,
- &validation_entry_match,
- &vemc);
+ &address->peer.hashPubKey,
+ &validation_entry_match, &vemc);
if (NULL != (ve = vemc.ve))
return ve;
if (public_key == NULL)
return NULL;
- ve = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
- ve->transport_name = GNUNET_strdup (tname);
- ve->addr = (void*) &ve[1];
+ ve = GNUNET_malloc (sizeof (struct ValidationEntry));
+ ve->in_use = GNUNET_SYSERR; /* not defined */
+ ve->last_line_set_to_no = 0;
+ ve->last_line_set_to_yes = 0;
+ ve->address = GNUNET_HELLO_address_copy (address);
ve->public_key = *public_key;
- ve->pid = *neighbour;
- ve->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
- UINT32_MAX);
- memcpy (&ve[1], addr, addrlen);
- ve->addrlen = addrlen;
- GNUNET_CONTAINER_multihashmap_put (validation_map,
- &neighbour->hashPubKey,
- ve,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
+ ve->pid = address->peer;
+ ve->pong_sig_valid_until = GNUNET_TIME_absolute_get_zero_();
+ memset (&ve->pong_sig_cache, '\0', sizeof (struct GNUNET_CRYPTO_EccSignature));
+ ve->latency = GNUNET_TIME_UNIT_FOREVER_REL;
+ ve->challenge =
+ GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
+ ve->timeout_task =
+ GNUNET_SCHEDULER_add_delayed (UNVALIDATED_PING_KEEPALIVE,
+ &timeout_hello_validation, ve);
+ GNUNET_CONTAINER_multihashmap_put (validation_map, &address->peer.hashPubKey,
+ ve,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
+ ve->expecting_pong = GNUNET_NO;
return ve;
}
-/**
- * Notify validation watcher that an entry is now valid
- *
- * @param cls 'struct ValidationEntry' that is now valid
- * @param key peer identity (unused)
- * @param value a 'GST_ValidationIteratorContext' to notify
- * @return GNUNET_YES (continue to iterate)
- */
-static int
-notify_valid (void *cls,
- const GNUNET_HashCode *key,
- void *value)
-{
- struct ValidationEntry *ve = cls;
- struct GST_ValidationIteratorContext *vic = value;
-
- vic->cb (vic->cb_cls,
- &ve->public_key,
- &vic->target,
- ve->valid_until,
- ve->validation_block,
- ve->transport_name,
- ve->addr,
- ve->addrlen);
- return GNUNET_OK;
-}
-
-
/**
* Iterator which adds the given address to the set of validated
* addresses.
*
* @param cls original HELLO message
- * @param tname name of the transport
+ * @param address the address
* @param expiration expiration time
- * @param addr the address
- * @param addrlen length of the address
* @return GNUNET_OK (keep the address)
*/
static int
-add_valid_address (void *cls,
- const char *tname,
- struct GNUNET_TIME_Absolute expiration,
- const void *addr,
- uint16_t addrlen)
+add_valid_address (void *cls, const struct GNUNET_HELLO_Address *address,
+ struct GNUNET_TIME_Absolute expiration)
{
const struct GNUNET_HELLO_Message *hello = cls;
struct ValidationEntry *ve;
struct GNUNET_PeerIdentity pid;
- struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
-
- if (GNUNET_TIME_absolute_get_remaining (expiration).rel_value == 0)
- return GNUNET_OK; /* expired */
- if ( (GNUNET_OK !=
- GNUNET_HELLO_get_id (hello, &pid)) ||
- (GNUNET_OK !=
- GNUNET_HELLO_get_key (hello, &public_key)) )
- {
- GNUNET_break (0);
- return GNUNET_OK; /* invalid HELLO !? */
- }
- ve = find_validation_entry (&public_key, &pid, tname, addr, addrlen);
- ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until,
- expiration);
- GNUNET_CONTAINER_multihashmap_get_multiple (notify_map,
- &pid.hashPubKey,
- ¬ify_valid,
- ve);
+ struct GNUNET_ATS_Information ats;
+ struct GNUNET_CRYPTO_EccPublicKey public_key;
+
+ if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
+ return GNUNET_OK; /* expired */
+ if ((GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid)) ||
+ (GNUNET_OK != GNUNET_HELLO_get_key (hello, &public_key)))
+ {
+ GNUNET_break (0);
+ return GNUNET_OK; /* invalid HELLO !? */
+ }
+ if (0 == memcmp (&GST_my_identity, &pid, sizeof (struct GNUNET_PeerIdentity)))
+ {
+ /* Peerinfo returned own identity, skip validation */
+ return GNUNET_OK;
+ }
+
+ ve = find_validation_entry (&public_key, address);
+ ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until, expiration);
+
+ if (GNUNET_SCHEDULER_NO_TASK == ve->revalidation_task)
+ ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
+
+ ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
+ ats.value = htonl (ve->network);
+ GNUNET_ATS_address_add (GST_ats, address, NULL, &ats, 1);
+
return GNUNET_OK;
}
/**
- * Function called for any HELLO known to PEERINFO.
+ * Function called for any HELLO known to PEERINFO.
*
* @param cls unused
* @param peer id of the peer, NULL for last call
* @param hello hello message for the peer (can be NULL)
- * @param error message
+ * @param err_msg error message
*/
static void
-process_peerinfo_hello (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_HELLO_Message *hello,
- const char *err_msg)
+process_peerinfo_hello (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_HELLO_Message *hello,
+ const char *err_msg)
{
GNUNET_assert (NULL != peer);
if (NULL == hello)
return;
GNUNET_assert (NULL ==
- GNUNET_HELLO_iterate_addresses (hello,
- GNUNET_NO,
- &add_valid_address,
- (void*) hello));
+ GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO,
+ &add_valid_address,
+ (void *) hello));
}
/**
* Start the validation subsystem.
- */
-void
-GST_validation_start ()
-{
- validation_map = GNUNET_CONTAINER_multihashmap_create (VALIDATION_MAP_SIZE);
- notify_map = GNUNET_CONTAINER_multihashmap_create (VALIDATION_MAP_SIZE);
- pnc = GNUNET_PEERINFO_notify (GST_cfg,
- &process_peerinfo_hello,
- NULL);
-}
-
-
-/**
- * Iterate over validation entries and free them.
*
- * @param cls (unused)
- * @param key peer identity (unused)
- * @param value a 'struct ValidationEntry' to clean up
- * @return GNUNET_YES (continue to iterate)
+ * @param max_fds maximum number of fds to use
*/
-static int
-cleanup_validation_entry (void *cls,
- const GNUNET_HashCode *key,
- void *value)
+void
+GST_validation_start (unsigned int max_fds)
{
- struct ValidationEntry *ve = value;
-
- GNUNET_free (ve->transport_name);
- if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
- {
- GNUNET_SCHEDULER_cancel (ve->timeout_task);
- ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- }
- GNUNET_free (ve);
- return GNUNET_OK;
+ /**
+ * Initialization for validation throttling
+ *
+ * We have a maximum number max_fds of connections we can use for validation
+ * We monitor the number of validations in parallel and start to throttle it
+ * when doing to many validations in parallel:
+ * if (running validations < (max_fds / 2))
+ * - "fast start": run validation immediately
+ * - have delay of (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2)
+ * (300 sec / ~150 == ~2 sec.) between two validations
+ */
+
+ validation_next = GNUNET_TIME_absolute_get();
+ validation_delay.rel_value_us = (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2);
+ validations_fast_start_threshold = (max_fds / 2);
+ validations_running = 0;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Validation uses a fast start threshold of %u connections and a delay between of %s\n ",
+ validations_fast_start_threshold,
+ GNUNET_STRINGS_relative_time_to_string (validation_delay,
+ GNUNET_YES));
+ validation_map = GNUNET_CONTAINER_multihashmap_create (VALIDATION_MAP_SIZE,
+ GNUNET_NO);
+ pnc = GNUNET_PEERINFO_notify (GST_cfg, GNUNET_YES, &process_peerinfo_hello, NULL);
}
struct CheckHelloValidatedContext *chvc;
GNUNET_CONTAINER_multihashmap_iterate (validation_map,
- &cleanup_validation_entry,
- NULL);
+ &cleanup_validation_entry, NULL);
GNUNET_CONTAINER_multihashmap_destroy (validation_map);
validation_map = NULL;
- GNUNET_assert (GNUNET_CONTAINER_multihashmap_size (notify_map) == 0);
- GNUNET_CONTAINER_multihashmap_destroy (notify_map);
- notify_map = NULL;
while (NULL != (chvc = chvc_head))
- {
- GNUNET_CONTAINER_DLL_remove (chvc_head,
- chvc_tail,
- chvc);
- GNUNET_free (chvc);
- }
+ {
+ GNUNET_CONTAINER_DLL_remove (chvc_head, chvc_tail, chvc);
+ GNUNET_free (chvc);
+ }
GNUNET_PEERINFO_notify_cancel (pnc);
}
/**
- * Address validation cleanup task (record no longer needed).
+ * Send the given PONG to the given address.
*
- * @param cls the 'struct ValidationEntry'
- * @param tc scheduler context (unused)
- */
-static void
-timeout_hello_validation (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct ValidationEntry *va = cls;
-
- va->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- GNUNET_STATISTICS_update (GST_stats,
- gettext_noop ("# address records discarded"),
- 1,
- GNUNET_NO);
- GNUNET_break (GNUNET_OK ==
- GNUNET_CONTAINER_multihashmap_remove (validation_map,
- &va->pid.hashPubKey,
- va));
- GNUNET_free (va->transport_name);
- GNUNET_free (va);
-}
-
-
-/**
- * Send the given PONG to the given address.
- *
- * @param cls the PONG message
- * @param public_key public key for the peer, never NULL
- * @param target peer this change is about, never NULL
- * @param valid_until is ZERO if we never validated the address,
- * otherwise a time up to when we consider it (or was) valid
- * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
- * is ZERO if the address is considered valid (no validation needed)
- * otherwise a time in the future if we're currently denying re-validation
- * @param plugin_name name of the plugin
- * @param plugin_address binary address
- * @param plugin_address_len length of address
+ * @param cls the PONG message
+ * @param public_key public key for the peer, never NULL
+ * @param valid_until is ZERO if we never validated the address,
+ * otherwise a time up to when we consider it (or was) valid
+ * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
+ * is ZERO if the address is considered valid (no validation needed)
+ * otherwise a time in the future if we're currently denying re-validation
+ * @param address target address
*/
static void
multicast_pong (void *cls,
- const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key,
- const struct GNUNET_PeerIdentity *target,
+ const struct GNUNET_CRYPTO_EccPublicKey *public_key,
struct GNUNET_TIME_Absolute valid_until,
- struct GNUNET_TIME_Absolute validation_block,
- const char *plugin_name,
- const void *plugin_address,
- size_t plugin_address_len)
+ struct GNUNET_TIME_Absolute validation_block,
+ const struct GNUNET_HELLO_Address *address)
{
struct TransportPongMessage *pong = cls;
struct GNUNET_TRANSPORT_PluginFunctions *papi;
- papi = GST_plugins_find (plugin_name);
+ papi = GST_plugins_find (address->transport_name);
if (papi == NULL)
return;
- (void) papi->send (papi->cls,
- target,
- (const char*) pong,
- ntohs (pong->header.size),
- PONG_PRIORITY,
- HELLO_REVALIDATION_START_TIME,
- NULL,
- plugin_address,
- plugin_address_len,
- GNUNET_YES,
- NULL, NULL);
+
+ GNUNET_assert (papi->send != NULL);
+ GNUNET_assert (papi->get_session != NULL);
+
+ struct Session * session = papi->get_session(papi->cls, address);
+ if (session == NULL)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ papi->send (papi->cls, session,
+ (const char *) pong, ntohs (pong->header.size),
+ PONG_PRIORITY, ACCEPTABLE_PING_DELAY,
+ NULL, NULL);
}
*
* @param sender peer sending the PING
* @param hdr the PING
+ * @param sender_address the sender address as we got it
* @param session session we got the PING from
- * @param plugin_name name of plugin that received the PING
- * @param sender_address address of the sender as known to the plugin, NULL
- * if we did not initiate the connection
- * @param sender_address_len number of bytes in sender_address
*/
void
GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
- const struct GNUNET_MessageHeader *hdr,
- const char *plugin_name,
- struct Session *session,
- const void *sender_address,
- size_t sender_address_len)
+ const struct GNUNET_MessageHeader *hdr,
+ const struct GNUNET_HELLO_Address *sender_address,
+ struct Session *session)
{
-
const struct TransportPingMessage *ping;
struct TransportPongMessage *pong;
struct GNUNET_TRANSPORT_PluginFunctions *papi;
- struct GNUNET_CRYPTO_RsaSignature *sig_cache;
+ struct GNUNET_CRYPTO_EccSignature *sig_cache;
struct GNUNET_TIME_Absolute *sig_cache_exp;
const char *addr;
const char *addrend;
+ char *plugin_name;
+ char *pos;
size_t alen;
size_t slen;
ssize_t ret;
+ int buggy = GNUNET_NO;
+ struct GNUNET_HELLO_Address address;
if (ntohs (hdr->size) < sizeof (struct TransportPingMessage))
- {
- GNUNET_break_op (0);
- return;
- }
+ {
+ GNUNET_break_op (0);
+ return;
+ }
ping = (const struct TransportPingMessage *) hdr;
- if (0 != memcmp (&ping->target,
- &GST_my_identity,
- sizeof (struct GNUNET_PeerIdentity)))
- {
- GNUNET_break_op (0);
- return;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
- "Processing `%s' from `%s'\n",
- "PING",
- (sender_address != NULL)
- ? GST_plugin_a2s (plugin_name,
- sender_address,
- sender_address_len)
- : "<inbound>");
-#endif
+ if (0 !=
+ memcmp (&ping->target, &GST_my_identity,
+ sizeof (struct GNUNET_PeerIdentity)))
+ {
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop
+ ("# PING message for different peer received"), 1,
+ GNUNET_NO);
+ return;
+ }
GNUNET_STATISTICS_update (GST_stats,
- gettext_noop ("# PING messages received"),
- 1,
- GNUNET_NO);
- addr = (const char*) &ping[1];
+ gettext_noop ("# PING messages received"), 1,
+ GNUNET_NO);
+ addr = (const char *) &ping[1];
alen = ntohs (hdr->size) - sizeof (struct TransportPingMessage);
/* peer wants to confirm that this is one of our addresses, this is what is
- used for address validation */
-
- addrend = memchr (addr, '\0', alen);
- if (NULL == addrend)
+ * used for address validation */
+
+ sig_cache = NULL;
+ sig_cache_exp = NULL;
+ papi = NULL;
+ if (alen > 0)
+ {
+ addrend = memchr (addr, '\0', alen);
+ if (NULL == addrend)
{
GNUNET_break_op (0);
return;
}
- addrend++;
- slen = strlen(addr);
- alen -= slen;
-
- if (GNUNET_YES !=
- GST_hello_test_address (addr,
- addrend,
- alen,
- &sig_cache,
- &sig_cache_exp))
+ addrend++;
+ slen = strlen (addr) + 1;
+ alen -= slen;
+ address.address = addrend;
+ address.address_length = alen;
+ address.transport_name = addr;
+ address.peer = GST_my_identity;
+
+ if (NULL == address.transport_name)
{
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("Not confirming PING with address `%s' since I cannot confirm having this address.\n"),
- GST_plugins_a2s (addr,
- addrend,
- alen));
+ GNUNET_break (0);
+ }
+
+ if (0 != strstr (address.transport_name, "_client"))
+ {
+ plugin_name = GNUNET_strdup (address.transport_name);
+ pos = strstr (plugin_name, "_client");
+ GNUNET_assert (NULL != pos);
+ GNUNET_snprintf (pos, strlen ("_server") + 1, "%s", "_server");
+ }
+ else
+ plugin_name = GNUNET_strdup (address.transport_name);
+
+ if (NULL == (papi = GST_plugins_find (plugin_name)))
+ {
+ /* we don't have the plugin for this address */
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Plugin `%s' not available, cannot confirm having this address \n",
+ plugin_name);
+ GNUNET_free (plugin_name);
return;
}
-
+ GNUNET_free (plugin_name);
+ if (GNUNET_OK != papi->check_address (papi->cls, addrend, alen))
+ {
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop
+ ("# failed address checks during validation"), 1,
+ GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Address `%s' is not one of my addresses, not confirming PING\n",
+ GST_plugins_a2s (&address));
+ return;
+ }
+ else
+ {
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop
+ ("# successful address checks during validation"), 1,
+ GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Address `%s' is one of my addresses, confirming PING\n",
+ GST_plugins_a2s (&address));
+ }
+
+ if (GNUNET_YES != GST_hello_test_address (&address, &sig_cache, &sig_cache_exp))
+ {
+ if (GNUNET_NO == buggy)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Not confirming PING from peer `%s' with address `%s' since I cannot confirm having this address.\n",
+ GNUNET_i2s (sender),
+ GST_plugins_a2s (&address));
+ return;
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ _("Received a PING message with validation bug from `%s'\n"),
+ GNUNET_i2s (sender));
+ }
+ }
+ }
+ else
+ {
+ addrend = NULL; /* make gcc happy */
+ slen = 0;
+ static struct GNUNET_CRYPTO_EccSignature no_address_signature;
+ static struct GNUNET_TIME_Absolute no_address_signature_expiration;
+
+ sig_cache = &no_address_signature;
+ sig_cache_exp = &no_address_signature_expiration;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "I am `%s', sending PONG to peer `%s'\n",
+ GNUNET_h2s (&GST_my_identity.hashPubKey),
+ GNUNET_i2s (sender));
+
+ /* message with structure:
+ * [TransportPongMessage][Transport name][Address] */
+
pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
- pong->header.size = htons (sizeof (struct TransportPongMessage) + alen + slen);
+ pong->header.size =
+ htons (sizeof (struct TransportPongMessage) + alen + slen);
pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
pong->purpose.size =
- htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
- sizeof (uint32_t) +
- sizeof (struct GNUNET_TIME_AbsoluteNBO) +
- sizeof (struct GNUNET_PeerIdentity) + alen + slen);
+ htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
+ sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
+ alen + slen);
pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
- pong->challenge = ping->challenge;
- pong->addrlen = htonl(alen + slen);
- pong->pid = GST_my_identity;
- memcpy (&pong[1], addr, slen);
- memcpy (&((char*)&pong[1])[slen], addrend, alen);
- if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4)
+ memcpy (&pong->challenge, &ping->challenge, sizeof (ping->challenge));
+ pong->addrlen = htonl (alen + slen);
+ memcpy (&pong[1], addr, slen); /* Copy transport plugin */
+ if (alen > 0)
+ {
+ GNUNET_assert (NULL != addrend);
+ memcpy (&((char *) &pong[1])[slen], addrend, alen);
+ }
+ if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value_us <
+ PONG_SIGNATURE_LIFETIME.rel_value_us / 4)
+ {
+ /* create / update cached sig */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Creating PONG signature to indicate ownership.\n");
+ *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
+ pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
+ if (GNUNET_OK !=
+ GNUNET_CRYPTO_ecc_sign (GST_my_private_key, &pong->purpose,
+ sig_cache))
{
- /* create / update cached sig */
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Creating PONG signature to indicate ownership.\n");
-#endif
- *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
- pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
- &pong->purpose,
- sig_cache));
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to create PONG signature for peer `%s'\n"), GNUNET_i2s (sender));
}
+ }
else
- {
- pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
- }
+ {
+ pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
+ }
pong->signature = *sig_cache;
+
+ GNUNET_assert (sender_address != NULL);
/* first see if the session we got this PING from can be used to transmit
- a response reliably */
- papi = GST_plugins_find (plugin_name);
+ * a response reliably */
if (papi == NULL)
ret = -1;
else
- ret = papi->send (papi->cls,
- sender,
- (const char*) pong,
- ntohs (pong->header.size),
- PONG_PRIORITY,
- HELLO_REVALIDATION_START_TIME,
- session,
- sender_address,
- sender_address_len,
- GNUNET_SYSERR,
- NULL, NULL);
- if (ret != -1)
+ {
+ GNUNET_assert (papi->send != NULL);
+ GNUNET_assert (papi->get_session != NULL);
+
+ if (session == NULL)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitted PONG to `%s' via reliable mechanism\n",
- GNUNET_i2s (sender));
- /* done! */
- GNUNET_STATISTICS_update (GST_stats,
- gettext_noop ("# PONGs unicast via reliable transport"),
- 1,
- GNUNET_NO);
- GNUNET_free (pong);
- return;
+ session = papi->get_session (papi->cls, sender_address);
}
-
+ if (session == NULL)
+ {
+ GNUNET_break (0);
+ ret = -1;
+ }
+ else
+ {
+ ret = papi->send (papi->cls, session,
+ (const char *) pong, ntohs (pong->header.size),
+ PONG_PRIORITY, ACCEPTABLE_PING_DELAY,
+ NULL, NULL);
+ }
+ }
+ if (ret != -1)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmitted PONG to `%s' via reliable mechanism\n",
+ GNUNET_i2s (sender));
+ /* done! */
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop
+ ("# PONGs unicast via reliable transport"), 1,
+ GNUNET_NO);
+ GNUNET_free (pong);
+ return;
+ }
+
/* no reliable method found, try transmission via all known addresses */
GNUNET_STATISTICS_update (GST_stats,
- gettext_noop ("# PONGs multicast to all available addresses"),
- 1,
- GNUNET_NO);
- (void) GST_validation_get_addresses (sender,
- GNUNET_YES,
- &multicast_pong,
- pong);
+ gettext_noop
+ ("# PONGs multicast to all available addresses"), 1,
+ GNUNET_NO);
+ GST_validation_get_addresses (sender, &multicast_pong, pong);
GNUNET_free (pong);
}
{
/**
* Hash of the public key of the peer whose address is being validated.
- */
+ */
struct GNUNET_PeerIdentity pid;
/**
* Public key of the peer whose address is being validated.
*/
- struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
+ struct GNUNET_CRYPTO_EccPublicKey public_key;
};
* (unless blocked or already validated).
*
* @param cls pointer to a 'struct ValidateAddressContext'
- * @param tname name of the transport
+ * @param address the address
* @param expiration expiration time
- * @param addr the address
- * @param addrlen length of the address
* @return GNUNET_OK (keep the address)
*/
static int
-validate_address (void *cls,
- const char *tname,
- struct GNUNET_TIME_Absolute expiration,
- const void *addr,
- uint16_t addrlen)
+validate_address_iterator (void *cls,
+ const struct GNUNET_HELLO_Address *address,
+ struct GNUNET_TIME_Absolute expiration)
{
const struct ValidateAddressContext *vac = cls;
- const struct GNUNET_PeerIdentity *pid = &vac->pid;
struct ValidationEntry *ve;
- struct TransportPingMessage ping;
- struct GNUNET_TRANSPORT_PluginFunctions *papi;
- const struct GNUNET_MessageHeader *hello;
- ssize_t ret;
- size_t tsize;
- size_t slen;
- uint16_t hsize;
- if (GNUNET_TIME_absolute_get_remaining (expiration).rel_value == 0)
- return GNUNET_OK; /* expired */
- ve = find_validation_entry (&vac->public_key, pid, tname, addr, addrlen);
- if (GNUNET_TIME_absolute_get_remaining (ve->validation_block).rel_value > 0)
- return GNUNET_OK; /* blocked */
- if ( (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task) &&
- (GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value > 0) )
- return GNUNET_OK; /* revalidation task already scheduled & still valid */
- ve->validation_block = GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME);
- if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
- GNUNET_SCHEDULER_cancel (ve->timeout_task);
- ve->timeout_task = GNUNET_SCHEDULER_add_delayed (HELLO_REVALIDATION_START_TIME,
- &timeout_hello_validation,
- ve);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting plain PING to `%s'\n",
- GNUNET_i2s (pid));
- ping.header.size = htons(sizeof(struct TransportPingMessage));
- ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
- ping.challenge = htonl(ve->challenge);
- ping.target = *pid;
-
- slen = strlen(ve->transport_name) + 1;
- hello = GST_hello_get ();
- hsize = ntohs (hello->size);
- tsize = sizeof(struct TransportPingMessage) + ve->addrlen + slen + hsize;
- if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Not transmitting `%s' with `%s', message too big (%u bytes!). This should not happen.\n"),
- "HELLO",
- "PING",
- (unsigned int) tsize);
- /* message too big (!?), get rid of HELLO */
- hsize = 0;
- tsize = sizeof(struct TransportPingMessage) + ve->addrlen + slen + hsize;
- }
- {
- char message_buf[tsize];
-
- memcpy(message_buf, hello, hsize);
- memcpy(&message_buf[hsize], &ping, sizeof (struct TransportPingMessage));
- memcpy(&message_buf[sizeof (struct TransportPingMessage) + hsize],
- ve->transport_name,
- slen);
- memcpy(&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
- ve->addr,
- ve->addrlen);
- papi = GST_plugins_find (ve->transport_name);
- if (papi == NULL)
- ret = -1;
- else
- ret = papi->send (papi->cls,
- pid,
- message_buf,
- tsize,
- PING_PRIORITY,
- HELLO_REVALIDATION_START_TIME,
- NULL /* no session */,
- ve->addr,
- ve->addrlen,
- GNUNET_YES,
- NULL, NULL);
- }
- if (-1 != ret)
- {
- ve->send_time = GNUNET_TIME_absolute_get ();
- GNUNET_STATISTICS_update (GST_stats,
- gettext_noop ("# PING without HELLO messages sent"),
- 1,
- GNUNET_NO);
- }
+ if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
+ return GNUNET_OK; /* expired */
+ ve = find_validation_entry (&vac->public_key, address);
+ if (GNUNET_SCHEDULER_NO_TASK == ve->revalidation_task)
+ ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
return GNUNET_OK;
}
-/**
- * Do address validation again to keep address valid.
- *
- * @param cls the 'struct ValidationEntry'
- * @param tc scheduler context (unused)
- */
-static void
-revalidate_address (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct ValidationEntry *ve = cls;
- struct GNUNET_TIME_Relative delay;
- struct ValidateAddressContext vac;
-
- ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- delay = GNUNET_TIME_absolute_get_remaining (ve->validation_block);
- if (delay.rel_value > 0)
- {
- /* should wait a bit longer */
- ve->timeout_task = GNUNET_SCHEDULER_add_delayed (delay,
- &revalidate_address,
- ve);
- return;
- }
- GNUNET_STATISTICS_update (GST_stats,
- gettext_noop ("# address revalidations started"),
- 1,
- GNUNET_NO);
- vac.pid = ve->pid;
- vac.public_key = ve->public_key;
- validate_address (&vac,
- ve->transport_name,
- ve->valid_until,
- ve->addr,
- (uint16_t) ve->addrlen);
-}
-
-
/**
* Add the validated peer address to the HELLO.
*
* @param cls the 'struct ValidationEntry' with the validated address
* @param max space in buf
* @param buf where to add the address
+ * @return number of bytes written, 0 to signal the
+ * end of the iteration.
*/
static size_t
-add_valid_peer_address (void *cls,
- size_t max,
- void *buf)
+add_valid_peer_address (void *cls, size_t max, void *buf)
{
struct ValidationEntry *ve = cls;
- return GNUNET_HELLO_add_address (ve->transport_name,
- ve->valid_until,
- ve->addr,
- ve->addrlen,
- buf,
- max);
+ if (GNUNET_YES == ve->copied)
+ return 0; /* terminate */
+ ve->copied = GNUNET_YES;
+ return GNUNET_HELLO_add_address (ve->address, ve->valid_until, buf, max);
}
*
* @param sender peer sending the PONG
* @param hdr the PONG
- * @param plugin_name name of plugin that received the PONG
- * @param sender_address address of the sender as known to the plugin, NULL
- * if we did not initiate the connection
- * @param sender_address_len number of bytes in sender_address
*/
void
GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
- const struct GNUNET_MessageHeader *hdr,
- const char *plugin_name,
- const void *sender_address,
- size_t sender_address_len)
+ const struct GNUNET_MessageHeader *hdr)
{
const struct TransportPongMessage *pong;
struct ValidationEntry *ve;
+ const char *tname;
const char *addr;
- const char *addrend;
- size_t alen;
+ size_t addrlen;
size_t slen;
- uint32_t rdelay;
- struct GNUNET_TIME_Relative delay;
+ size_t size;
struct GNUNET_HELLO_Message *hello;
+ struct GNUNET_HELLO_Address address;
+ int sig_res;
+ int do_verify;
if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
- {
- GNUNET_break_op (0);
- return;
- }
+ {
+ GNUNET_break_op (0);
+ return;
+ }
GNUNET_STATISTICS_update (GST_stats,
- gettext_noop ("# PONG messages received"),
- 1,
- GNUNET_NO);
+ gettext_noop ("# PONG messages received"), 1,
+ GNUNET_NO);
+
+ /* message with structure:
+ * [TransportPongMessage][Transport name][Address] */
+
pong = (const struct TransportPongMessage *) hdr;
- if (0 != memcmp (&pong->pid,
- sender,
- sizeof (struct GNUNET_PeerIdentity)))
- {
- GNUNET_break_op (0);
- return;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
- "Processing `%s' from `%s'\n",
- "PONG",
- (sender_address != NULL)
- ? GST_plugin_a2s (plugin_name,
- sender_address,
- sender_address_len)
- : "<inbound>");
-#endif
- addr = (const char*) &pong[1];
- alen = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
- addrend = memchr (addr, '\0', alen);
- if (NULL == addrend)
- {
- GNUNET_break_op (0);
- return;
- }
- addrend++;
- slen = strlen(addr);
- alen -= slen;
- ve = find_validation_entry (NULL,
- sender,
- addr,
- addrend,
- alen);
- if (NULL == ve)
- {
- GNUNET_STATISTICS_update (GST_stats,
- gettext_noop ("# PONGs dropped, no matching pending validation"),
- 1,
- GNUNET_NO);
- return;
- }
+ tname = (const char *) &pong[1];
+ size = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
+ addr = memchr (tname, '\0', size);
+ if (NULL == addr)
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ addr++;
+ slen = strlen (tname) + 1;
+ addrlen = size - slen;
+ address.peer = *sender;
+ address.address = addr;
+ address.address_length = addrlen;
+ address.transport_name = tname;
+ ve = find_validation_entry (NULL, &address);
+ if ((NULL == ve) || (GNUNET_NO == ve->expecting_pong))
+ {
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop
+ ("# PONGs dropped, no matching pending validation"),
+ 1, GNUNET_NO);
+ return;
+ }
/* now check that PONG is well-formed */
- if (GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value == 0)
- {
- GNUNET_STATISTICS_update (GST_stats,
- gettext_noop ("# PONGs dropped, signature expired"),
- 1,
- GNUNET_NO);
- return;
- }
- if (GNUNET_OK !=
- GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
- &pong->purpose,
- &pong->signature,
- &ve->public_key))
- {
- GNUNET_break_op (0);
- return;
- }
-
+ if (0 != memcmp (&ve->pid, sender, sizeof (struct GNUNET_PeerIdentity)))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ if (GNUNET_TIME_absolute_get_remaining
+ (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value_us == 0)
+ {
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop
+ ("# PONGs dropped, signature expired"), 1,
+ GNUNET_NO);
+ return;
+ }
+
+ sig_res = GNUNET_SYSERR;
+ do_verify = GNUNET_YES;
+ if (0 != GNUNET_TIME_absolute_get_remaining(ve->pong_sig_valid_until).rel_value_us)
+ {
+ /* We have a cached and valid signature for this peer,
+ * try to compare instead of verify */
+ if (0 == memcmp (&ve->pong_sig_cache, &pong->signature, sizeof (struct GNUNET_CRYPTO_EccSignature)))
+ {
+ /* signatures are identical, we can skip verification */
+ sig_res = GNUNET_OK;
+ do_verify = GNUNET_NO;
+ }
+ else
+ {
+ sig_res = GNUNET_SYSERR;
+ /* signatures do not match, we have to verify */
+ }
+ }
+
+ if (GNUNET_YES == do_verify)
+ {
+ /* Do expensive verification */
+ sig_res = GNUNET_CRYPTO_ecc_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
+ &pong->purpose, &pong->signature,
+ &ve->public_key);
+ if (sig_res == GNUNET_SYSERR)
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Failed to verify: invalid signature on address %s:%s from peer `%s'\n",
+ tname, GST_plugins_a2s (ve->address),GNUNET_i2s (sender));
+ }
+
+ if (sig_res == GNUNET_SYSERR)
+ return;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Address validated for peer `%s' with plugin `%s': `%s'\n",
+ GNUNET_i2s (sender), tname, GST_plugins_a2s (ve->address));
/* validity achieved, remember it! */
+ ve->expecting_pong = GNUNET_NO;
ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
+ ve->pong_sig_cache = pong->signature;
+ ve->pong_sig_valid_until = GNUNET_TIME_absolute_ntoh (pong->expiration);
+ ve->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
+ {
+ struct GNUNET_ATS_Information ats[2];
+ ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
+ ats[0].value = htonl ((uint32_t) ve->latency.rel_value_us);
+ ats[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
+ ats[1].value = htonl ((uint32_t) ve->network);
+ GNUNET_ATS_address_add (GST_ats, ve->address, NULL, ats, 2);
+ }
+ if (validations_running > 0)
+ {
+ validations_running --;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Validation finished, %u validation processes running\n",
+ validations_running);
+ }
+ else
+ GNUNET_break (0);
/* build HELLO to store in PEERINFO */
- hello = GNUNET_HELLO_create (&ve->public_key,
- &add_valid_peer_address,
- ve);
- GNUNET_PEERINFO_add_peer (GST_peerinfo,
- hello);
+ ve->copied = GNUNET_NO;
+ hello = GNUNET_HELLO_create (&ve->public_key, &add_valid_peer_address, ve, GNUNET_NO);
+ GNUNET_PEERINFO_add_peer (GST_peerinfo, hello, NULL, NULL);
GNUNET_free (hello);
-
- if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
- GNUNET_SCHEDULER_cancel (ve->timeout_task);
-
- /* randomly delay by up to 1h to avoid synchronous validations */
- rdelay = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
- 60 * 60);
- delay = GNUNET_TIME_relative_add (HELLO_REVALIDATION_START_TIME,
- GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
- rdelay));
- ve->timeout_task = GNUNET_SCHEDULER_add_delayed (delay,
- &revalidate_address,
- ve);
}
void
GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
{
- const struct GNUNET_HELLO_Message* hm = (const struct GNUNET_HELLO_Message*) hello;
+ const struct GNUNET_HELLO_Message *hm =
+ (const struct GNUNET_HELLO_Message *) hello;
struct ValidateAddressContext vac;
+ struct GNUNET_HELLO_Message *h;
+ int friend;
- if ( (GNUNET_OK !=
- GNUNET_HELLO_get_id (hm, &vac.pid)) ||
- (GNUNET_OK !=
- GNUNET_HELLO_get_key (hm, &vac.public_key)) )
- {
- /* malformed HELLO */
- GNUNET_break (0);
- return;
- }
+ friend = GNUNET_HELLO_is_friend_only (hm);
+ if (((GNUNET_YES != friend) && (GNUNET_NO != friend)) ||
+ (GNUNET_OK != GNUNET_HELLO_get_id (hm, &vac.pid)) ||
+ (GNUNET_OK != GNUNET_HELLO_get_key (hm, &vac.public_key)))
+ {
+ /* malformed HELLO */
+ GNUNET_break (0);
+ return;
+ }
+ if (0 ==
+ memcmp (&GST_my_identity, &vac.pid, sizeof (struct GNUNET_PeerIdentity)))
+ return;
+ /* Add peer identity without addresses to peerinfo service */
+ h = GNUNET_HELLO_create (&vac.public_key, NULL, NULL, friend);
+ GNUNET_PEERINFO_add_peer (GST_peerinfo, h, NULL, NULL);
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ _("Adding `%s' without addresses for peer `%s'\n"), "HELLO",
+ GNUNET_i2s (&vac.pid));
+
+ GNUNET_free (h);
GNUNET_assert (NULL ==
- GNUNET_HELLO_iterate_addresses (hm,
- GNUNET_NO,
- &validate_address,
- &vac));
+ GNUNET_HELLO_iterate_addresses (hm, GNUNET_NO,
+ &validate_address_iterator,
+ &vac));
}
+/**
+ * Closure for 'iterate_addresses'
+ */
+struct IteratorContext
+{
+ /**
+ * Function to call on each address.
+ */
+ GST_ValidationAddressCallback cb;
+
+ /**
+ * Closure for 'cb'.
+ */
+ void *cb_cls;
+
+};
+
+
/**
* Call the callback in the closure for each validation entry.
*
* @return GNUNET_OK (continue to iterate)
*/
static int
-iterate_addresses (void *cls,
- const GNUNET_HashCode *key,
- void *value)
+iterate_addresses (void *cls, const struct GNUNET_HashCode * key, void *value)
{
- struct GST_ValidationIteratorContext *vic = cls;
+ struct IteratorContext *ic = cls;
struct ValidationEntry *ve = value;
- vic->cb (vic->cb_cls,
- &ve->public_key,
- &ve->pid,
- ve->valid_until,
- ve->validation_block,
- ve->transport_name,
- ve->addr,
- ve->addrlen);
+ ic->cb (ic->cb_cls, &ve->public_key, ve->valid_until, ve->revalidation_block,
+ ve->address);
return GNUNET_OK;
}
* Can either give a snapshot (synchronous API) or be continuous.
*
* @param target peer information is requested for
- * @param snapshot_only GNUNET_YES to iterate over addresses once, GNUNET_NO to
- * continue to give information about addresses as it evolves
* @param cb function to call; will not be called after this function returns
- * if snapshot_only is GNUNET_YES
* @param cb_cls closure for 'cb'
- * @return context to cancel, NULL if 'snapshot_only' is GNUNET_YES
*/
-struct GST_ValidationIteratorContext *
+void
GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
- int snapshot_only,
- GST_ValidationAddressCallback cb,
- void *cb_cls)
+ GST_ValidationAddressCallback cb, void *cb_cls)
{
- struct GST_ValidationIteratorContext *vic;
+ struct IteratorContext ic;
- vic = GNUNET_malloc (sizeof (struct GST_ValidationIteratorContext));
- vic->cb = cb;
- vic->cb_cls = cb_cls;
- vic->target = *target;
+ ic.cb = cb;
+ ic.cb_cls = cb_cls;
GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
- &target->hashPubKey,
- &iterate_addresses,
- vic);
- if (GNUNET_YES == snapshot_only)
+ &target->hashPubKey,
+ &iterate_addresses, &ic);
+}
+
+
+/**
+ * Update if we are using an address for a connection actively right now.
+ * Based on this, the validation module will measure latency for the
+ * address more or less often.
+ *
+ * @param address the address
+ * @param session the session
+ * @param in_use GNUNET_YES if we are now using the address for a connection,
+ * GNUNET_NO if we are no longer using the address for a connection
+ * @param line line of caller just for DEBUGGING!
+ */
+void
+GST_validation_set_address_use (const struct GNUNET_HELLO_Address *address,
+ struct Session *session,
+ int in_use,
+ int line)
+{
+ struct ValidationEntry *ve;
+
+ if (NULL != address)
+ ve = find_validation_entry (NULL, address);
+ else
+ ve = NULL; /* FIXME: lookup based on session... */
+ if (NULL == ve)
+ {
+ /* this can happen for inbound connections (sender_address_len == 0); */
+ return;
+ }
+ if (ve->in_use == in_use)
+ {
+
+ if (GNUNET_YES == in_use)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Error setting address in use for peer `%s' `%s' to USED: set last time by %i, called now by %i\n",
+ GNUNET_i2s (&address->peer), GST_plugins_a2s (address),
+ ve->last_line_set_to_yes, line);
+ }
+ if (GNUNET_NO == in_use)
{
- GNUNET_free (vic);
- return NULL;
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Error setting address in use for peer `%s' `%s' to NOT_USED: set last time by %i, called now by %i\n",
+ GNUNET_i2s (&address->peer), GST_plugins_a2s (address),
+ ve->last_line_set_to_no, line);
}
- GNUNET_CONTAINER_multihashmap_put (notify_map,
- &target->hashPubKey,
- vic,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
- return vic;
+ }
+
+ if (GNUNET_YES == in_use)
+ {
+ ve->last_line_set_to_yes = line;
+ }
+ if (GNUNET_NO == in_use)
+ {
+ ve->last_line_set_to_no = line;
+ }
+
+ GNUNET_break (ve->in_use != in_use); /* should be different... */
+ ve->in_use = in_use;
+ if (in_use == GNUNET_YES)
+ {
+ /* from now on, higher frequeny, so reschedule now */
+ GNUNET_SCHEDULER_cancel (ve->revalidation_task);
+ ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
+ }
}
/**
- * Cancel an active validation address iteration.
+ * Query validation about the latest observed latency on a given
+ * address.
*
- * @param ctx the context of the operation that is cancelled
+ * @param sender peer
+ * @param address the address
+ * @param session session
+ * @return observed latency of the address, FOREVER if the address was
+ * never successfully validated
*/
-void
-GST_validation_get_addresses_cancel (struct GST_ValidationIteratorContext *ctx)
+struct GNUNET_TIME_Relative
+GST_validation_get_address_latency (const struct GNUNET_PeerIdentity *sender,
+ const struct GNUNET_HELLO_Address *address,
+ struct Session *session)
{
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CONTAINER_multihashmap_remove (notify_map,
- &ctx->target.hashPubKey,
- ctx));
- GNUNET_free (ctx);
+ struct ValidationEntry *ve;
+
+ if (NULL == address)
+ {
+ GNUNET_break (0); // FIXME: support having latency only with session...
+ return GNUNET_TIME_UNIT_FOREVER_REL;
+ }
+ ve = find_validation_entry (NULL, address);
+ if (NULL == ve)
+ return GNUNET_TIME_UNIT_FOREVER_REL;
+ return ve->latency;
}
projects / oweals / gnunet.git / blobdiff