/*
     This file is part of GNUnet.
     Copyright (C) 2012 GNUnet e.V.

     GNUnet is free software: you can redistribute it and/or modify it
     under the terms of the GNU Affero General Public License as published
     by the Free Software Foundation, either version 3 of the License,
     or (at your option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Affero General Public License for more details.

     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.

     SPDX-License-Identifier: AGPL3.0-or-later
 */
/**
 * @file namestore/test_namestore_api_lookup_shadow_filter.c
 * @brief testcase for namestore_api.c: store a record with short expiration
 *      and a shadow record, perform lookup:
 *      - when active record is valid, expect only active record
 *      - when active record is expired, expect shadow record only
 */
#include "platform.h"
#include "gnunet_namecache_service.h"
#include "gnunet_namestore_service.h"
#include "gnunet_testing_lib.h"
#include "gnunet_dnsparser_lib.h"

#define TEST_RECORD_TYPE GNUNET_DNSPARSER_TYPE_TXT

#define TEST_NAME "dummy.dummy.gnunet"
#define TEST_RECORD_DATALEN 123
#define TEST_RECORD_DATA 'a'
#define TEST_SHADOW_RECORD_DATA 'b'

#define TIMEOUT GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 100)
#define EXPIRATION GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 5)

static struct GNUNET_NAMESTORE_Handle *nsh;

static struct GNUNET_NAMECACHE_Handle *nch;

static struct GNUNET_SCHEDULER_Task * endbadly_task;

static struct GNUNET_SCHEDULER_Task * delayed_lookup_task;

static struct GNUNET_CRYPTO_EcdsaPrivateKey *privkey;

static struct GNUNET_CRYPTO_EcdsaPublicKey pubkey;

static int res;

static struct GNUNET_NAMESTORE_QueueEntry *nsqe;

static struct GNUNET_NAMECACHE_QueueEntry *ncqe;

static struct GNUNET_NAMECACHE_QueueEntry *ncqe_shadow;

static struct GNUNET_GNSRECORD_Data records[2];

static struct GNUNET_TIME_Absolute record_expiration;

static struct GNUNET_HashCode derived_hash;

static struct GNUNET_CRYPTO_EcdsaPublicKey pubkey;


static void
cleanup()
{
  if (NULL != nsh)
    {
      GNUNET_NAMESTORE_disconnect(nsh);
      nsh = NULL;
    }
  if (NULL != nch)
    {
      GNUNET_NAMECACHE_disconnect(nch);
      nch = NULL;
    }
  if (NULL != privkey)
    {
      GNUNET_free(privkey);
      privkey = NULL;
    }
  GNUNET_SCHEDULER_shutdown();
}


/**
 * Re-establish the connection to the service.
 *
 * @param cls handle to use to re-connect.
 */
static void
endbadly(void *cls)
{
  if (NULL != delayed_lookup_task)
    {
      GNUNET_SCHEDULER_cancel(delayed_lookup_task);
      delayed_lookup_task = NULL;
    }
  if (NULL != nsqe)
    {
      GNUNET_NAMESTORE_cancel(nsqe);
      nsqe = NULL;
    }
  if (NULL != ncqe)
    {
      GNUNET_NAMECACHE_cancel(ncqe);
      ncqe = NULL;
    }
  cleanup();
  res = 1;
}


static void
end(void *cls)
{
  cleanup();
  res = 0;
}


static void
rd_decrypt_cb(void *cls,
              unsigned int rd_count,
              const struct GNUNET_GNSRECORD_Data *rd)
{
  struct GNUNET_GNSRECORD_Data *expected_rd = cls;
  char rd_cmp_data[TEST_RECORD_DATALEN];

  if (1 != rd_count)
    {
      GNUNET_SCHEDULER_add_now(&endbadly, NULL);
      GNUNET_break(0);
      return;
    }
  if (NULL == rd)
    {
      GNUNET_SCHEDULER_add_now(&endbadly, NULL);
      GNUNET_break(0);
      return;
    }
  if (expected_rd == &records[0])
    {
      /* Expecting active record */
      memset(rd_cmp_data, TEST_RECORD_DATA, TEST_RECORD_DATALEN);
      if (TEST_RECORD_TYPE != rd[0].record_type)
        {
          GNUNET_SCHEDULER_add_now(&endbadly, NULL);
          GNUNET_break(0);
          return;
        }
      if (TEST_RECORD_DATALEN != rd[0].data_size)
        {
          GNUNET_SCHEDULER_add_now(&endbadly, NULL);
          GNUNET_break(0);
          return;
        }
      if (0 != memcmp(&rd_cmp_data, rd[0].data, TEST_RECORD_DATALEN))
        {
          GNUNET_SCHEDULER_add_now(&endbadly, NULL);
          GNUNET_break(0);
          return;
        }
      if (0 != (GNUNET_GNSRECORD_RF_SHADOW_RECORD & rd[0].flags))
        {
          GNUNET_SCHEDULER_add_now(&endbadly, NULL);
          GNUNET_break(0);
          return;
        }
      GNUNET_log(GNUNET_ERROR_TYPE_INFO,
                 "Block was decrypted successfully with active record\n");
    }
  if (expected_rd == &records[1])
    {
      /* Expecting shadow record  but without shadow flag*/
      memset(rd_cmp_data, TEST_SHADOW_RECORD_DATA, TEST_RECORD_DATALEN);
      if (TEST_RECORD_TYPE != rd[0].record_type)
        {
          GNUNET_SCHEDULER_add_now(&endbadly, NULL);
          GNUNET_break(0);
          return;
        }
      if (TEST_RECORD_DATALEN != rd[0].data_size)
        {
          GNUNET_SCHEDULER_add_now(&endbadly, NULL);
          GNUNET_break(0);
          return;
        }
      if (0 != memcmp(&rd_cmp_data, rd[0].data, TEST_RECORD_DATALEN))
        {
          GNUNET_SCHEDULER_add_now(&endbadly, NULL);
          GNUNET_break(0);
          return;
        }
      if (0 != (GNUNET_GNSRECORD_RF_SHADOW_RECORD & rd[0].flags))
        {
          GNUNET_SCHEDULER_add_now(&endbadly, NULL);
          GNUNET_break(0);
          return;
        }
      GNUNET_log(GNUNET_ERROR_TYPE_INFO,
                 "Block was decrypted successfully with former shadow record \n");
      GNUNET_SCHEDULER_add_now(&end, NULL);
    }
}


static void
name_lookup_active_proc(void *cls,
                        const struct GNUNET_GNSRECORD_Block *block)
{
  struct GNUNET_GNSRECORD_Data *expected_rd = cls;

  GNUNET_assert(NULL != expected_rd);

  ncqe = NULL;
  ncqe_shadow = NULL;
  if (endbadly_task != NULL)
    {
      GNUNET_SCHEDULER_cancel(endbadly_task);
      endbadly_task = NULL;
    }

  if (NULL == block)
    {
      GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
                 _("Namestore returned no block\n"));
      if (endbadly_task != NULL)
        GNUNET_SCHEDULER_cancel(endbadly_task);
      endbadly_task = GNUNET_SCHEDULER_add_now(&endbadly, NULL);
      return;
    }

  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "Namestore returned block, decrypting \n");
  GNUNET_assert(GNUNET_OK == GNUNET_GNSRECORD_block_decrypt(block,
                                                            &pubkey, TEST_NAME, &rd_decrypt_cb, expected_rd));
}


static void
name_lookup_shadow(void *cls)
{
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "Performing lookup for shadow record \n");
  delayed_lookup_task = NULL;
  ncqe_shadow = GNUNET_NAMECACHE_lookup_block(nch, &derived_hash,
                                              &name_lookup_active_proc, &records[1]);
}


static void
put_cont(void *cls, int32_t success, const char *emsg)
{
  nsqe = NULL;

  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "Name store added record for `%s': %s\n",
             TEST_NAME,
             (success == GNUNET_OK) ? "SUCCESS" : "FAIL");

  /* Create derived hash */
  GNUNET_CRYPTO_ecdsa_key_get_public(privkey, &pubkey);
  GNUNET_GNSRECORD_query_from_public_key(&pubkey, TEST_NAME, &derived_hash);

  if (0 == GNUNET_TIME_absolute_get_remaining(record_expiration).rel_value_us)
    {
      GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
                 "Test to too long to store records, cannot run test!\n");
      GNUNET_SCHEDULER_add_now(&end, NULL);
      return;
    }
  /* Lookup active record now */
  GNUNET_log(GNUNET_ERROR_TYPE_INFO,
             "Performing lookup for active record \n");
  ncqe = GNUNET_NAMECACHE_lookup_block(nch, &derived_hash,
                                       &name_lookup_active_proc, &records[0]);

  delayed_lookup_task = GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_relative_multiply(EXPIRATION, 2), &name_lookup_shadow, NULL);
}


static void
run(void *cls,
    const struct GNUNET_CONFIGURATION_Handle *cfg,
    struct GNUNET_TESTING_Peer *peer)
{
  endbadly_task = GNUNET_SCHEDULER_add_delayed(TIMEOUT,
                                               &endbadly,
                                               NULL);
  privkey = GNUNET_CRYPTO_ecdsa_key_create();
  GNUNET_assert(privkey != NULL);
  GNUNET_CRYPTO_ecdsa_key_get_public(privkey,
                                     &pubkey);

  record_expiration = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(),
                                               EXPIRATION);
  records[0].expiration_time = record_expiration.abs_value_us;
  records[0].record_type = TEST_RECORD_TYPE;
  records[0].data_size = TEST_RECORD_DATALEN;
  records[0].data = GNUNET_malloc(TEST_RECORD_DATALEN);
  records[0].flags = GNUNET_GNSRECORD_RF_NONE;
  memset((char *)records[0].data, TEST_RECORD_DATA, TEST_RECORD_DATALEN);

  records[1].expiration_time = GNUNET_TIME_absolute_get().abs_value_us + 1000000000;
  records[1].record_type = TEST_RECORD_TYPE;
  records[1].data_size = TEST_RECORD_DATALEN;
  records[1].data = GNUNET_malloc(TEST_RECORD_DATALEN);
  records[1].flags = GNUNET_GNSRECORD_RF_SHADOW_RECORD;
  memset((char *)records[1].data, TEST_SHADOW_RECORD_DATA, TEST_RECORD_DATALEN);

  nsh = GNUNET_NAMESTORE_connect(cfg);
  nch = GNUNET_NAMECACHE_connect(cfg);
  GNUNET_break(NULL != nsh);
  GNUNET_break(NULL != nch);
  nsqe = GNUNET_NAMESTORE_records_store(nsh, privkey, TEST_NAME,
                                        2, records, &put_cont, NULL);
  if (NULL == nsqe)
    {
      GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
                 _("Namestore cannot store no block\n"));
    }

  GNUNET_free((void *)records[0].data);
  GNUNET_free((void *)records[1].data);
}


#include "test_common.c"


int
main(int argc, char *argv[])
{
  const char *plugin_name;
  char *cfg_name;

  SETUP_CFG(plugin_name, cfg_name);
  res = 1;
  if (0 !=
      GNUNET_TESTING_peer_run("test-namestore-api-lookup-shadow-filter",
                              cfg_name,
                              &run,
                              NULL))
    {
      res = 1;
    }
  GNUNET_DISK_purge_cfg_dir(cfg_name,
                            "GNUNET_TEST_HOME");
  GNUNET_free(cfg_name);
  return res;
}


/* end of test_namestore_api_lookup_shadow_filter.c */