}
+/**
+ * Function called when we get a result from the dht
+ * for our record query
+ *
+ * @param cls the request handle
+ * @param exp lifetime
+ * @param key the key the record was stored under
+ * @param get_path get path
+ * @param get_path_length get path length
+ * @param put_path put path
+ * @param put_path_length put path length
+ * @param type the block type
+ * @param size the size of the record
+ * @param data the record data
+ */
+static void
+process_pseu_dht_result(void* cls,
+ struct GNUNET_TIME_Absolute exp,
+ const GNUNET_HashCode * key,
+ const struct GNUNET_PeerIdentity *get_path,
+ unsigned int get_path_length,
+ const struct GNUNET_PeerIdentity *put_path,
+ unsigned int put_path_length,
+ enum GNUNET_BLOCK_Type type,
+ size_t size, const void *data)
+{
+ struct GNUNET_GNS_ResolverHandle *rh;
+ struct RecordLookupHandle *rlh;
+ struct GNSNameRecordBlock *nrb;
+ uint32_t num_records;
+ char* name = NULL;
+ char* rd_data = (char*)data;
+ int i;
+ int rd_size;
+
+ GNUNET_HashCode zone, name_hash;
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "got PSEU dht result (size=%d)\n", size);
+
+ if (data == NULL)
+ return;
+
+ //FIXME maybe check expiration here, check block type
+
+ rh = (struct GNUNET_GNS_ResolverHandle *)cls;
+ rlh = (struct RecordLookupHandle *) rh->proc_cls;
+ nrb = (struct GNSNameRecordBlock*)data;
+
+ /* stop lookup and timeout task */
+ GNUNET_DHT_get_stop (rh->get_handle);
+ GNUNET_SCHEDULER_cancel(rh->dht_timeout_task);
+
+ rh->get_handle = NULL;
+ name = (char*)&nrb[1];
+ num_records = ntohl(nrb->rd_count);
+ {
+ struct GNUNET_NAMESTORE_RecordData rd[num_records];
+
+ rd_data += strlen(name) + 1 + sizeof(struct GNSNameRecordBlock);
+ rd_size = size - strlen(name) - 1 - sizeof(struct GNSNameRecordBlock);
+
+ if (GNUNET_SYSERR == GNUNET_NAMESTORE_records_deserialize (rd_size,
+ rd_data,
+ num_records,
+ rd))
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Error deserializing data!\n");
+ return;
+ }
+
+ for (i=0; i<num_records; i++)
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Got name: %s (wanted %s)\n", name, rh->name);
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Got type: %d\n",
+ rd[i].record_type);
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Got data length: %d\n", rd[i].data_size);
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Got flag %d\n", rd[i].flags);
+
+ if ((strcmp(name, "+") == 0) &&
+ (rd[i].record_type == GNUNET_GNS_RECORD_PSEU))
+ {
+ rh->answered++;
+ }
+
+ }
+
+ GNUNET_CRYPTO_hash(name, strlen(name), &name_hash);
+ GNUNET_CRYPTO_hash_xor(key, &name_hash, &zone);
+
+ /**
+ * FIXME check pubkey against existing key in namestore?
+ * https://gnunet.org/bugs/view.php?id=2179
+ */
+
+ /* Save to namestore */
+ GNUNET_NAMESTORE_record_put (namestore_handle,
+ &nrb->public_key,
+ name,
+ exp,
+ num_records,
+ rd,
+ &nrb->signature,
+ &on_namestore_record_put_result, //cont
+ NULL); //cls
+
+ if (rh->answered)
+ rh->proc(rh->proc_cls, rh, num_records, rd);
+ else
+ rh->proc(rh->proc_cls, rh, 0, NULL);
+ }
+
+}
+
+
/**
* Start DHT lookup for a PSEUdonym record in
* rh->authority's zone
GNUNET_HashCode name_hash;
GNUNET_HashCode lookup_key;
- //Empty string
- GNUNET_CRYPTO_hash("",
- 1,
+ GNUNET_CRYPTO_hash("+",
+ strlen("+"),
&name_hash);
GNUNET_CRYPTO_hash_xor(&name_hash, &rh->authority, &lookup_key);
GNUNET_DHT_RO_NONE,
&xquery,
sizeof(xquery),
- &process_delegation_result_dht,
+ &process_pseu_dht_result,
rh);
}
rh->proc = &handle_shorten_pseu_ns_result;
GNUNET_NAMESTORE_lookup_record(namestore_handle,
&rh->authority_chain_head->zone,
- "",
+ "+",
GNUNET_GNS_RECORD_PSEU,
&process_shorten_pseu_lookup_ns,
rh);
strcpy(result, rh->name);
strcpy(result+strlen(rh->name), ".");
strcpy(result+strlen(rh->name)+1, pseu);
- strcpy(result+strlen(rh->name)+strlen(pseu), gnunet_tld);
+ strcpy(result+strlen(rh->name)+strlen(pseu)+1, gnunet_tld);
GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
"Sending pseudonym shorten result %s\n", result);
--- /dev/null
+/*
+ This file is part of GNUnet.
+ (C) 2009 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 gns/test_gns_twopeer.c
+ * @brief base testcase for testing DHT service with
+ * two running peers.
+ *
+ * This testcase starts peers using the GNUNET_TESTING_daemons_start
+ * function call. On peer start, connects to the peers DHT service
+ * by calling GNUNET_DHT_connected. Once notified about all peers
+ * being started (by the peers_started_callback function), calls
+ * GNUNET_TESTING_connect_topology, which connects the peers in a
+ * "straight line" topology. On notification that all peers have
+ * been properly connected, calls the do_get function which initiates
+ * a GNUNET_DHT_get from the *second* peer. Once the GNUNET_DHT_get
+ * function starts, runs the do_put function to insert data at the first peer.
+ * If the GET is successful, schedules finish_testing
+ * to stop the test and shut down peers. If GET is unsuccessful
+ * after GET_TIMEOUT seconds, prints an error message and shuts down
+ * the peers.
+ */
+#include "platform.h"
+#include "gnunet_testing_lib.h"
+#include "gnunet_core_service.h"
+#include "block_gns.h"
+#include "gnunet_signatures.h"
+#include "gnunet_namestore_service.h"
+#include "../namestore/namestore.h"
+#include "gnunet_dnsparser_lib.h"
+#include "gnunet_dht_service.h"
+#include "gnunet_gns_service.h"
+
+/* DEFINES */
+#define VERBOSE GNUNET_YES
+
+/* Timeout for entire testcase */
+#define TIMEOUT GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 10)
+
+/* If number of peers not in config file, use this number */
+#define DEFAULT_NUM_PEERS 2
+
+/* test records to resolve */
+#define TEST_DOMAIN "www.alice.bob.gnunet"
+#define TEST_IP "127.0.0.1"
+#define TEST_RECORD_NAME "www"
+
+#define TEST_AUTHORITY_NAME "bob"
+#define TEST_AUTHORITY_ALICE "alice"
+#define TEST_ALICE_PSEU "carol"
+#define TEST_EXPECTED_RESULT "www.carol.gnunet"
+
+#define DHT_OPERATION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
+
+/* Globals */
+
+/**
+ * Directory to store temp data in, defined in config file
+ */
+static char *test_directory;
+
+struct GNUNET_TESTING_Daemon *d1;
+
+
+/* Task handle to use to schedule test failure */
+GNUNET_SCHEDULER_TaskIdentifier die_task;
+
+/* Global return value (0 for success, anything else for failure) */
+static int ok;
+
+static struct GNUNET_NAMESTORE_Handle *namestore_handle;
+
+static struct GNUNET_GNS_Handle *gns_handle;
+
+static struct GNUNET_DHT_Handle *dht_handle;
+
+const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded alice_pkey;
+struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded bob_pkey;
+struct GNUNET_CRYPTO_RsaPrivateKey *alice_key;
+struct GNUNET_CRYPTO_RsaPrivateKey *bob_key;
+
+/**
+ * Check whether peers successfully shut down.
+ */
+void
+shutdown_callback (void *cls, const char *emsg)
+{
+ if (emsg != NULL)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Error on shutdown! ret=%d\n", ok);
+ if (ok == 0)
+ ok = 2;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, "done(ret=%d)!\n", ok);
+}
+
+
+/**
+ * Called when gns shorten finishes
+ */
+static void
+process_shorten_result(void* cls, const char* sname)
+{
+ GNUNET_GNS_disconnect(gns_handle);
+
+ ok = 0;
+
+ if (sname == NULL)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "shorten test failed!\n");
+ ok = 1;
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "%s shortened to %s\n", (char*)cls, sname);
+ if (0 != strcmp(sname, TEST_EXPECTED_RESULT))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "shorten test failed! (wanted: %s got: %s\n",
+ (char*)cls, sname);
+ ok = 1;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shorten test succeeded!\n");
+
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Shutting down peer1!\n");
+ GNUNET_TESTING_daemon_stop (d1, TIMEOUT, &shutdown_callback, NULL,
+ GNUNET_YES, GNUNET_NO);
+}
+
+/**
+ * Function scheduled to be run on the successful start of services
+ * tries to look up the dns record for TEST_DOMAIN
+ */
+static void
+commence_testing (void* cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ GNUNET_NAMESTORE_disconnect(namestore_handle, GNUNET_YES);
+
+ gns_handle = GNUNET_GNS_connect(cfg);
+
+ if (NULL == gns_handle)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Failed to connect to GNS!\n");
+ ok = 1;
+ }
+
+ GNUNET_GNS_shorten(gns_handle, TEST_DOMAIN, &process_shorten_result,
+ TEST_DOMAIN);
+}
+
+/**
+ * Continuation for the GNUNET_DHT_get_stop call, so that we don't shut
+ * down the peers without freeing memory associated with GET request.
+ */
+static void
+end_badly_cont (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+
+ if (d1 != NULL)
+ GNUNET_TESTING_daemon_stop (d1, TIMEOUT, &shutdown_callback, NULL,
+ GNUNET_YES, GNUNET_NO);
+ GNUNET_SCHEDULER_cancel (die_task);
+}
+
+/**
+ * Check if the get_handle is being used, if so stop the request. Either
+ * way, schedule the end_badly_cont function which actually shuts down the
+ * test.
+ */
+static void
+end_badly (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Failing test with error: `%s'!\n",
+ (char *) cls);
+ GNUNET_SCHEDULER_add_now (&end_badly_cont, NULL);
+ ok = 1;
+}
+
+
+static void
+put_www_dht(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNSNameRecordBlock *nrb;
+ GNUNET_HashCode name_hash;
+ GNUNET_HashCode xor_hash;
+ GNUNET_HashCode zone_hash;
+ uint32_t rd_payload_length;
+ char* nrb_data = NULL;
+ struct GNUNET_CRYPTO_RsaSignature *sig;
+ struct GNUNET_NAMESTORE_RecordData rd;
+ char* ip = TEST_IP;
+ struct in_addr *web = GNUNET_malloc(sizeof(struct in_addr));
+
+ rd.expiration = GNUNET_TIME_absolute_get_forever ();
+ GNUNET_assert(1 == inet_pton (AF_INET, ip, web));
+ rd.data_size = sizeof(struct in_addr);
+ rd.data = web;
+ rd.record_type = GNUNET_DNSPARSER_TYPE_A;
+
+ sig = GNUNET_NAMESTORE_create_signature(alice_key,
+ GNUNET_TIME_absolute_get_forever(),
+ TEST_RECORD_NAME,
+ &rd, 1);
+ rd_payload_length = GNUNET_NAMESTORE_records_get_size (1, &rd);
+ nrb = GNUNET_malloc(rd_payload_length + strlen(TEST_RECORD_NAME) + 1
+ + sizeof(struct GNSNameRecordBlock));
+ nrb->signature = *sig;
+ nrb->public_key = alice_pkey;
+ nrb->rd_count = htonl(1);
+ memset(&nrb[1], 0, strlen(TEST_RECORD_NAME) + 1);
+ memcpy(&nrb[1], TEST_RECORD_NAME, strlen(TEST_RECORD_NAME));
+ nrb_data = (char*)&nrb[1];
+ nrb_data += strlen(TEST_RECORD_NAME) + 1;
+
+ if (-1 == GNUNET_NAMESTORE_records_serialize (1,
+ &rd,
+ rd_payload_length,
+ nrb_data))
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Record serialization failed!\n");
+ ok = 3;
+ GNUNET_free (nrb);
+ return;
+ }
+ GNUNET_CRYPTO_hash(TEST_RECORD_NAME, strlen(TEST_RECORD_NAME), &name_hash);
+ GNUNET_CRYPTO_hash(&alice_pkey,
+ sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
+ &zone_hash);
+ GNUNET_CRYPTO_hash_xor(&zone_hash, &name_hash, &xor_hash);
+
+ rd_payload_length += sizeof(struct GNSNameRecordBlock) +
+ strlen(TEST_RECORD_NAME) + 1;
+ GNUNET_DHT_put (dht_handle, &xor_hash,
+ 0,
+ GNUNET_DHT_RO_NONE,
+ GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
+ rd_payload_length,
+ (char*)nrb,
+ rd.expiration,
+ DHT_OPERATION_TIMEOUT,
+ NULL,
+ NULL);
+ GNUNET_free (nrb);
+ GNUNET_SCHEDULER_add_delayed(TIMEOUT, &commence_testing, NULL);
+}
+
+
+static void
+put_alice_pseu_dht(void *cls, int32_t success, const char *emsg)
+{
+ struct GNSNameRecordBlock *nrb;
+ GNUNET_HashCode name_hash;
+ GNUNET_HashCode xor_hash;
+ GNUNET_HashCode zone_hash;
+ uint32_t rd_payload_length;
+ char* nrb_data = NULL;
+ struct GNUNET_CRYPTO_RsaSignature *sig;
+ struct GNUNET_NAMESTORE_RecordData rd;
+
+ rd.expiration = GNUNET_TIME_absolute_get_forever ();
+ rd.data_size = strlen(TEST_ALICE_PSEU);
+ rd.data = TEST_ALICE_PSEU;
+ rd.record_type = GNUNET_GNS_RECORD_PSEU;
+
+ sig = GNUNET_NAMESTORE_create_signature(alice_key,
+ GNUNET_TIME_absolute_get_forever(),
+ "+", //empty name for pseu
+ &rd, 1);
+ rd_payload_length = GNUNET_NAMESTORE_records_get_size (1, &rd);
+ nrb = GNUNET_malloc(rd_payload_length + strlen("") + 1
+ + sizeof(struct GNSNameRecordBlock));
+ nrb->signature = *sig;
+ nrb->public_key = alice_pkey;
+ nrb->rd_count = htonl(1);
+ memset(&nrb[1], 0, strlen("+") + 1);
+ memcpy(&nrb[1], "+", strlen("+"));
+ nrb_data = (char*)&nrb[1];
+ nrb_data += strlen("+") + 1;
+
+ if (-1 == GNUNET_NAMESTORE_records_serialize (1,
+ &rd,
+ rd_payload_length,
+ nrb_data))
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Record serialization failed!\n");
+ ok = 3;
+ GNUNET_free (nrb);
+ return;
+ }
+ GNUNET_CRYPTO_hash("+", strlen("+"), &name_hash);
+ GNUNET_CRYPTO_hash(&alice_pkey,
+ sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
+ &zone_hash);
+ GNUNET_CRYPTO_hash_xor(&zone_hash, &name_hash, &xor_hash);
+
+ rd_payload_length += sizeof(struct GNSNameRecordBlock) +
+ strlen("+") + 1;
+ GNUNET_DHT_put (dht_handle, &xor_hash,
+ 0,
+ GNUNET_DHT_RO_NONE,
+ GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
+ rd_payload_length,
+ (char*)nrb,
+ rd.expiration,
+ DHT_OPERATION_TIMEOUT,
+ NULL,
+ NULL);
+ GNUNET_free (nrb);
+ GNUNET_SCHEDULER_add_delayed(TIMEOUT, &put_www_dht, NULL);
+}
+
+static void
+do_shorten(void *cls, const struct GNUNET_PeerIdentity *id,
+ const struct GNUNET_CONFIGURATION_Handle *cfg,
+ struct GNUNET_TESTING_Daemon *d, const char *emsg)
+{
+
+ char* my_keyfile;
+ struct GNUNET_CRYPTO_RsaPrivateKey *my_key;
+ GNUNET_HashCode bob_hash;
+ GNUNET_HashCode alice_hash;
+ struct GNUNET_CRYPTO_RsaSignature *sig;
+
+
+ GNUNET_SCHEDULER_cancel (die_task);
+
+ /* put records into namestore */
+ namestore_handle = GNUNET_NAMESTORE_connect(cfg);
+ if (NULL == namestore_handle)
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Failed to connect to namestore\n");
+ ok = -1;
+ return;
+ }
+
+ /* dht */
+ dht_handle = GNUNET_DHT_connect(cfg, 1);
+ if (NULL == dht_handle)
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Failed to connect to dht\n");
+ ok = -1;
+ return;
+ }
+
+ if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg, "gns",
+ "ZONEKEY",
+ &my_keyfile))
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Failed to get key from cfg\n");
+ ok = -1;
+ return;
+ }
+
+ my_key = GNUNET_CRYPTO_rsa_key_create_from_file (my_keyfile);
+ alice_key = GNUNET_CRYPTO_rsa_key_create ();
+ bob_key = GNUNET_CRYPTO_rsa_key_create ();
+
+ GNUNET_CRYPTO_rsa_key_get_public (alice_key, &alice_pkey);
+ GNUNET_CRYPTO_rsa_key_get_public (bob_key, &bob_pkey);
+ GNUNET_CRYPTO_hash(&bob_pkey, sizeof(bob_pkey), &bob_hash);
+ GNUNET_CRYPTO_hash(&alice_pkey, sizeof(alice_pkey), &alice_hash);
+
+ struct GNUNET_NAMESTORE_RecordData rd;
+ rd.expiration = GNUNET_TIME_absolute_get_forever ();
+ rd.data_size = sizeof(GNUNET_HashCode);
+ rd.data = &bob_hash;
+ rd.record_type = GNUNET_GNS_RECORD_PKEY;
+
+ GNUNET_NAMESTORE_record_create (namestore_handle,
+ my_key,
+ TEST_AUTHORITY_NAME,
+ &rd,
+ NULL,
+ NULL);
+
+ rd.data = &alice_hash;
+
+ sig = GNUNET_NAMESTORE_create_signature(bob_key,
+ GNUNET_TIME_absolute_get_forever(),
+ TEST_AUTHORITY_ALICE,
+ &rd,
+ 1);
+
+ GNUNET_NAMESTORE_record_put (namestore_handle,
+ &bob_pkey,
+ TEST_AUTHORITY_ALICE,
+ GNUNET_TIME_absolute_get_forever(),
+ 1,
+ &rd,
+ sig,
+ &put_alice_pseu_dht,
+ NULL);
+
+
+
+
+
+}
+
+static void
+run (void *cls, char *const *args, const char *cfgfile,
+ const struct GNUNET_CONFIGURATION_Handle *c)
+{
+ cfg = c;
+ /* Get path from configuration file */
+ if (GNUNET_YES !=
+ GNUNET_CONFIGURATION_get_value_string (cfg, "paths", "servicehome",
+ &test_directory))
+ {
+ ok = 404;
+ return;
+ }
+
+
+ /* Set up a task to end testing if peer start fails */
+ die_task =
+ GNUNET_SCHEDULER_add_delayed (TIMEOUT, &end_badly,
+ "didn't start all daemons in reasonable amount of time!!!");
+
+ /* Start alice */
+ d1 = GNUNET_TESTING_daemon_start(cfg, TIMEOUT, GNUNET_NO, NULL, NULL, 0,
+ NULL, NULL, NULL, &do_shorten, NULL);
+}
+
+static int
+check ()
+{
+ int ret;
+
+ /* Arguments for GNUNET_PROGRAM_run */
+ char *const argv[] = { "test-gns-dht-delegated-lookup", /* Name to give running binary */
+ "-c",
+ "test_gns_simple_lookup.conf", /* Config file to use */
+#if VERBOSE
+ "-L", "DEBUG",
+#endif
+ NULL
+ };
+ struct GNUNET_GETOPT_CommandLineOption options[] = {
+ GNUNET_GETOPT_OPTION_END
+ };
+ /* Run the run function as a new program */
+ ret =
+ GNUNET_PROGRAM_run ((sizeof (argv) / sizeof (char *)) - 1, argv,
+ "test-gns-dht-delegated-lookup", "nohelp", options, &run,
+ &ok);
+ if (ret != GNUNET_OK)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "`test-gns-dht-delegated-lookup': Failed with error code %d\n", ret);
+ }
+ return ok;
+}
+
+int
+main (int argc, char *argv[])
+{
+ int ret;
+
+ GNUNET_log_setup ("test-gns-simple-lookup",
+#if VERBOSE
+ "DEBUG",
+#else
+ "WARNING",
+#endif
+ NULL);
+ ret = check ();
+ /**
+ * Need to remove base directory, subdirectories taken care
+ * of by the testing framework.
+ */
+ return ret;
+}
+
+/* end of test_gns_twopeer.c */
projects / oweals / gnunet.git / commitdiff