ntopng/src/UsedPorts.cpp

/*
 *
 * (C) 2013-25 - 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"

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

UsedPorts::UsedPorts(Host* _h) {
  if(trace_new_delete) ntop->getTrace()->traceEvent(TRACE_NORMAL, "[new] %s", __FILE__);
  h = _h, bitmap_server_ports = NULL;
}

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

UsedPorts::UsedPorts() {
  if(trace_new_delete) ntop->getTrace()->traceEvent(TRACE_NORMAL, "[new] %s", __FILE__);
  h = NULL, bitmap_server_ports = NULL;;
}

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

void UsedPorts::restore() {
  if(h && (bitmap_server_ports == NULL)) {
    char redis_key[128];

    bitmap_server_ports = new (std::nothrow) ServerPortsBitmap();

    if(bitmap_server_ports != NULL) {
      getRedisKey(redis_key, sizeof(redis_key));
      
      u_int actual_len = ntop->getRedis()->len(redis_key);
      char* json_str = (char *)malloc(actual_len + 1);
      
      if(json_str != NULL) {
	if ((ntop->getRedis()->get(redis_key, json_str, actual_len + 1)) == 0) {
	  if (!(bitmap_server_ports->deserializer((const char*) json_str)))
	    ntop->getTrace()->traceEvent(TRACE_WARNING, "Bitmap deserialization went wrong");
	}
	
	free(json_str);
      }
    }
  }
}

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

UsedPorts::~UsedPorts() { 
  if(bitmap_server_ports) {
    if(h) {
      char redis_key[128];
      const char *rsp = bitmap_server_ports->serializer();

      if(rsp != NULL) {
	getRedisKey(redis_key, 128);
	ntop->getRedis()->set(redis_key, rsp);
	ndpi_free((void*)rsp);
      }
    }

    delete bitmap_server_ports;
  }
}

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

void UsedPorts::reset() {
  udp_server_ports.clear(), tcp_server_ports.clear();
  udp_client_contacted_ports.clear(), tcp_client_contacted_ports.clear();
}

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

void UsedPorts::setLuaArray(
    lua_State *vm, NetworkInterface *iface, bool isTCP,
    std::unordered_map<u_int16_t, ndpi_protocol> *ports) {
  if (ports) {
    std::unordered_map<u_int16_t, ndpi_protocol>::iterator it;

    for (it = ports->begin(); it != ports->end(); ++it) {
      char str[32], buf[64];

      snprintf(str, sizeof(str), "%s:%u", isTCP ? "tcp" : "udp", it->first);
      lua_push_str_table_entry(vm, str,
			       ndpi_protocol2name(iface->get_ndpi_struct(), it->second, buf,
						  sizeof(buf)));
    }
  }
}

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

void UsedPorts::lua(lua_State *vm, NetworkInterface *iface) {
  lua_newtable(vm);

  /* ***************************** */
  lua_newtable(vm);
  
  setLuaArray(vm, iface, true, &tcp_server_ports);
  setLuaArray(vm, iface, false, &udp_server_ports);

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

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

  lua_newtable(vm);

  setLuaArray(vm, iface, true, &tcp_client_contacted_ports);
  setLuaArray(vm, iface, false, &udp_client_contacted_ports);

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

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

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

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

/*Return false if not new server port are detected after the learning period, true otherwise */
bool UsedPorts::setServerPort(bool isTCP, u_int16_t port,
                              ndpi_protocol *proto) {
  bool set_new_port = false;

  restore();
  
  if (isTCP) {
    if((proto->proto.master_protocol == NDPI_PROTOCOL_FTP_DATA)
       || (proto->proto.app_protocol == NDPI_PROTOCOL_FTP_DATA))
      ;
    else {
      if (tcp_server_ports.count(port) == 0) set_new_port = true;
      tcp_server_ports[port] = *proto;
      if(bitmap_server_ports) bitmap_server_ports->addPort(true, port);
    }
  } else {
    if (udp_server_ports.count(port) == 0) set_new_port = true;
    udp_server_ports[port] = *proto;
    if(bitmap_server_ports) bitmap_server_ports->addPort(false, port);
  }

  return set_new_port;
}

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

void UsedPorts::setContactedPort(bool isTCP, u_int16_t port,
                                 ndpi_protocol *proto) {
  if (isTCP)
    tcp_client_contacted_ports[port] = *proto;
  else
    udp_client_contacted_ports[port] = *proto;
}

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

char* UsedPorts::getRedisKey(char *redis_key, size_t key_len) {
  static char buf[64];

  snprintf(redis_key, key_len, LOCALHOST_SERVER_PORT_BITMAP, 
        h->getInterface()->get_id(), h->getSerializationKey(buf, sizeof(buf)));
  return redis_key;
}