/*
 *
 * (C) 2013-23 - ntop.org
 *
 *
 * This program 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 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */

#include "ntop_includes.h"

/* *************************************** */

DnsStats::DnsStats() {
  memset(&sent_stats.breakdown, 0, sizeof(sent_stats.breakdown)),
      memset(&rcvd_stats.breakdown, 0, sizeof(rcvd_stats.breakdown));
  sent_stats.num_queries.reset(), sent_stats.num_replies_ok.reset(),
      sent_stats.num_replies_error.reset(), rcvd_stats.num_queries.reset(),
      rcvd_stats.num_replies_ok.reset(), rcvd_stats.num_replies_error.reset();
}

/* *************************************** */

void DnsStats::incStats(bool as_client, const FlowDNSStats *fts) {
  struct dns_stats *qry = as_client ? &sent_stats : &rcvd_stats;
  struct dns_stats *rsp = as_client ? &rcvd_stats : &sent_stats;
  u_int16_t tot_qry = 0;

  if (fts->num_a) qry->breakdown.num_a += fts->num_a, tot_qry += fts->num_a;
  if (fts->num_ns) qry->breakdown.num_ns += fts->num_ns, tot_qry += fts->num_ns;
  if (fts->num_cname)
    qry->breakdown.num_cname += fts->num_cname, tot_qry += fts->num_cname;
  if (fts->num_soa)
    qry->breakdown.num_soa += fts->num_soa, tot_qry += fts->num_soa;
  if (fts->num_ptr)
    qry->breakdown.num_ptr += fts->num_ptr, tot_qry += fts->num_ptr;
  if (fts->num_mx) qry->breakdown.num_mx += fts->num_mx, tot_qry += fts->num_mx;
  if (fts->num_txt)
    qry->breakdown.num_txt += fts->num_txt, tot_qry += fts->num_txt;
  if (fts->num_aaaa)
    qry->breakdown.num_aaaa += fts->num_aaaa, tot_qry += fts->num_aaaa;
  if (fts->num_any)
    qry->breakdown.num_any += fts->num_any, tot_qry += fts->num_any;
  if (fts->num_other)
    qry->breakdown.num_other += fts->num_other, tot_qry += fts->num_other;
  if (tot_qry) qry->num_queries.inc(tot_qry);

  if (fts->num_replies_ok) rsp->num_replies_ok.inc(fts->num_replies_ok);
  if (fts->num_replies_error)
    rsp->num_replies_error.inc(fts->num_replies_error);
}

/* *************************************** */

void DnsStats::luaStats(lua_State *vm, struct dns_stats *stats,
                        const char *label, bool verbose) {
  lua_newtable(vm);

  lua_push_uint64_table_entry(vm, "num_queries", stats->num_queries.get());
  lua_push_uint64_table_entry(vm, "num_replies_ok",
                              stats->num_replies_ok.get());
  lua_push_uint64_table_entry(vm, "num_replies_error",
                              stats->num_replies_error.get());

  if (verbose) {
    lua_newtable(vm);
    lua_push_uint64_table_entry(vm, "num_a", stats->breakdown.num_a);
    lua_push_uint64_table_entry(vm, "num_ns", stats->breakdown.num_ns);
    lua_push_uint64_table_entry(vm, "num_cname", stats->breakdown.num_cname);
    lua_push_uint64_table_entry(vm, "num_soa", stats->breakdown.num_soa);
    lua_push_uint64_table_entry(vm, "num_ptr", stats->breakdown.num_ptr);
    lua_push_uint64_table_entry(vm, "num_mx", stats->breakdown.num_mx);
    lua_push_uint64_table_entry(vm, "num_txt", stats->breakdown.num_txt);
    lua_push_uint64_table_entry(vm, "num_aaaa", stats->breakdown.num_aaaa);
    lua_push_uint64_table_entry(vm, "num_any", stats->breakdown.num_any);
    lua_push_uint64_table_entry(vm, "num_other", stats->breakdown.num_other);
    lua_pushstring(vm, "queries");
    lua_insert(vm, -2);
    lua_settable(vm, -3);
  }

  lua_pushstring(vm, label);
  lua_insert(vm, -2);
  lua_settable(vm, -3);
}

/* *************************************** */

void DnsStats::lua(lua_State *vm, bool verbose) {
  lua_newtable(vm);

  luaStats(vm, &sent_stats, "sent", verbose);
  luaStats(vm, &rcvd_stats, "rcvd", verbose);

  lua_pushstring(vm, "dns");
  lua_insert(vm, -2);
  lua_settable(vm, -3);
}

/* *************************************** */

bool DnsStats::hasAnomalies(time_t when) {
  return sent_stats.num_queries.is_misbehaving(when) ||
         sent_stats.num_replies_ok.is_misbehaving(when) ||
         sent_stats.num_replies_error.is_misbehaving(when) ||
         rcvd_stats.num_queries.is_misbehaving(when) ||
         rcvd_stats.num_replies_ok.is_misbehaving(when) ||
         rcvd_stats.num_replies_error.is_misbehaving(when);
}

/* *************************************** */

void DnsStats::luaAnomalies(lua_State *vm, time_t when) {
  if (sent_stats.num_queries.is_misbehaving(when))
    sent_stats.num_queries.lua(vm, "dns.sent.num_queries");
  if (sent_stats.num_replies_ok.is_misbehaving(when))
    sent_stats.num_replies_ok.lua(vm, "dns.sent.num_replies_ok");
  if (sent_stats.num_replies_error.is_misbehaving(when))
    sent_stats.num_replies_error.lua(vm, "dns.sent.num_replies_error");

  if (rcvd_stats.num_queries.is_misbehaving(when))
    rcvd_stats.num_queries.lua(vm, "dns.rcvd.num_queries");
  if (rcvd_stats.num_replies_ok.is_misbehaving(when))
    rcvd_stats.num_replies_ok.lua(vm, "dns.rcvd.num_replies_ok");
  if (rcvd_stats.num_replies_error.is_misbehaving(when))
    rcvd_stats.num_replies_error.lua(vm, "dns.rcvd.num_replies_error");
}

/* ******************************************* */

json_object *DnsStats::getStatsJSONObject(struct dns_stats *stats) {
  json_object *my_object = json_object_new_object();
  json_object *my_stats = json_object_new_object();

  if (stats->num_queries.get() > 0)
    json_object_object_add(my_object, "num_queries",
                           json_object_new_int64(stats->num_queries.get()));
  if (stats->num_replies_ok.get() > 0)
    json_object_object_add(my_object, "num_replies_ok",
                           json_object_new_int64(stats->num_replies_ok.get()));
  if (stats->num_replies_error.get() > 0)
    json_object_object_add(
        my_object, "num_replies_error",
        json_object_new_int64(stats->num_replies_error.get()));

  if (stats->breakdown.num_a > 0)
    json_object_object_add(my_stats, "num_a",
                           json_object_new_int64(stats->breakdown.num_a));
  if (stats->breakdown.num_ns > 0)
    json_object_object_add(my_stats, "num_ns",
                           json_object_new_int64(stats->breakdown.num_ns));
  if (stats->breakdown.num_cname > 0)
    json_object_object_add(my_stats, "num_cname",
                           json_object_new_int64(stats->breakdown.num_cname));
  if (stats->breakdown.num_soa > 0)
    json_object_object_add(my_stats, "num_soa",
                           json_object_new_int64(stats->breakdown.num_soa));
  if (stats->breakdown.num_ptr > 0)
    json_object_object_add(my_stats, "num_ptr",
                           json_object_new_int64(stats->breakdown.num_ptr));
  if (stats->breakdown.num_mx > 0)
    json_object_object_add(my_stats, "num_mx",
                           json_object_new_int64(stats->breakdown.num_mx));
  if (stats->breakdown.num_txt > 0)
    json_object_object_add(my_stats, "num_txt",
                           json_object_new_int64(stats->breakdown.num_txt));
  if (stats->breakdown.num_aaaa > 0)
    json_object_object_add(my_stats, "num_aaaa",
                           json_object_new_int64(stats->breakdown.num_aaaa));
  if (stats->breakdown.num_any > 0)
    json_object_object_add(my_stats, "num_any",
                           json_object_new_int64(stats->breakdown.num_any));
  if (stats->breakdown.num_other > 0)
    json_object_object_add(my_stats, "num_other",
                           json_object_new_int64(stats->breakdown.num_other));
  json_object_object_add(my_object, "stats", my_stats);

  return (my_object);
}

/* ******************************************* */

json_object *DnsStats::getJSONObject() {
  json_object *my_object = json_object_new_object();

  json_object_object_add(my_object, "sent", getStatsJSONObject(&sent_stats));
  json_object_object_add(my_object, "rcvd", getStatsJSONObject(&rcvd_stats));

  return (my_object);
}

/* ******************************************* */

void DnsStats::updateStats(const struct timeval *const tv) {
  time_t when = tv->tv_sec;

  sent_stats.num_queries.computeAnomalyIndex(when),
      sent_stats.num_replies_ok.computeAnomalyIndex(when),
      sent_stats.num_replies_error.computeAnomalyIndex(when);
  rcvd_stats.num_queries.computeAnomalyIndex(when),
      rcvd_stats.num_replies_ok.computeAnomalyIndex(when),
      rcvd_stats.num_replies_error.computeAnomalyIndex(when);

#if 0
  char buf[64];
  ntop->getTrace()->traceEvent(TRACE_NORMAL, "sent.num_queries: %s",
			       sent_stats.num_queries.print(buf, sizeof(buf)));
  ntop->getTrace()->traceEvent(TRACE_NORMAL, "sent.num_replies_ok: %s",
			       sent_stats.num_replies_ok.print(buf, sizeof(buf)));
  ntop->getTrace()->traceEvent(TRACE_NORMAL, "sent.num_replies_error: %s",
			       sent_stats.num_replies_error.print(buf, sizeof(buf)));
  ntop->getTrace()->traceEvent(TRACE_NORMAL, "rcvd.num_queries: %s",
			       rcvd_stats.num_queries.print(buf, sizeof(buf)));
  ntop->getTrace()->traceEvent(TRACE_NORMAL, "rcvd.num_replies_ok: %s",
			       rcvd_stats.num_replies_ok.print(buf, sizeof(buf)));
  ntop->getTrace()->traceEvent(TRACE_NORMAL, "rcvd.num_replies_error: %s",
			       rcvd_stats.num_replies_error.print(buf, sizeof(buf)));
#endif
}
