src/modules/extra/m_geo_maxmind.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2019 Peter Powell <petpow@saberuk.com>
   5  *
   6  * This file is part of InspIRCd.  InspIRCd is free software: you can
   7  * redistribute it and/or modify it under the terms of the GNU General Public
   8  * License as published by the Free Software Foundation, version 2.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  12  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  13  * details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 /// $CompilerFlags: find_compiler_flags("libmaxminddb" "")
  20 /// $LinkerFlags: find_linker_flags("libmaxminddb" "-lmaxminddb")
  21
  22 /// $PackageInfo: require_system("darwin") libmaxminddb pkg-config
  23 /// $PackageInfo: require_system("debian" "9.0") libmaxminddb-dev pkg-config
  24 /// $PackageInfo: require_system("ubuntu" "16.04") libmaxminddb-dev pkg-config
  25
  26 #ifdef _WIN32
  27 # pragma comment(lib, "libmaxminddb.lib")
  28 #endif
  29
  30 #include <maxminddb.h>
  31 #include "inspircd.h"
  32 #include "modules/geolocation.h"
  33
  34 class GeolocationExtItem : public LocalExtItem
  35 {
  36  public:
  37         GeolocationExtItem(Module* parent)
  38                 : LocalExtItem("geolocation", ExtensionItem::EXT_USER, parent)
  39         {
  40         }
  41
  42         void free(Extensible* container, void* item) CXX11_OVERRIDE
  43         {
  44                 Geolocation::Location* old = static_cast<Geolocation::Location*>(item);
  45                 if (old)
  46                         old->refcount_dec();
  47         }
  48
  49         Geolocation::Location* get(const Extensible* item) const
  50         {
  51                 return static_cast<Geolocation::Location*>(get_raw(item));
  52         }
  53
  54         void set(Extensible* item, Geolocation::Location* value)
  55         {
  56                 value->refcount_inc();
  57                 free(item, set_raw(item, value));
  58         }
  59
  60         void unset(Extensible* container)
  61         {
  62                 free(container, unset_raw(container));
  63         }
  64 };
  65
  66 typedef insp::flat_map<std::string, Geolocation::Location*> LocationMap;
  67
  68 class GeolocationAPIImpl : public Geolocation::APIBase
  69 {
  70  public:
  71         GeolocationExtItem ext;
  72         LocationMap locations;
  73         MMDB_s mmdb;
  74
  75         GeolocationAPIImpl(Module* parent)
  76                 : Geolocation::APIBase(parent)
  77                 , ext(parent)
  78         {
  79         }
  80
  81         Geolocation::Location* GetLocation(User* user) CXX11_OVERRIDE
  82         {
  83                 // If we have the location cached then use that instead.
  84                 Geolocation::Location* location = ext.get(user);
  85                 if (location)
  86                         return location;
  87
  88                 // Attempt to locate this user.
  89                 location = GetLocation(user->client_sa);
  90                 if (!location)
  91                         return NULL;
  92
  93                 // We found the user. Cache their location for future use.
  94                 ext.set(user, location);
  95                 return location;
  96         }
  97
  98         Geolocation::Location* GetLocation(irc::sockets::sockaddrs& sa) CXX11_OVERRIDE
  99         {
 100                 // Attempt to look up the socket address.
 101                 int result;
 102                 MMDB_lookup_result_s lookup = MMDB_lookup_sockaddr(&mmdb, &sa.sa, &result);
 103                 if (result != MMDB_SUCCESS || !lookup.found_entry)
 104                         return NULL;
 105
 106                 // Attempt to retrieve the country code.
 107                 MMDB_entry_data_s country_code;
 108                 result = MMDB_get_value(&lookup.entry, &country_code, "country", "iso_code", NULL);
 109                 if (result != MMDB_SUCCESS || !country_code.has_data || country_code.type != MMDB_DATA_TYPE_UTF8_STRING || country_code.data_size != 2)
 110                         return NULL;
 111
 112                 // If the country has been seen before then use our cached Location object.
 113                 const std::string code(country_code.utf8_string, country_code.data_size);
 114                 LocationMap::iterator liter = locations.find(code);
 115                 if (liter != locations.end())
 116                         return liter->second;
 117
 118                 // Attempt to retrieve the country name.
 119                 MMDB_entry_data_s country_name;
 120                 result = MMDB_get_value(&lookup.entry, &country_name, "country", "names", "en", NULL);
 121                 if (result != MMDB_SUCCESS || !country_name.has_data || country_name.type != MMDB_DATA_TYPE_UTF8_STRING)
 122                         return NULL;
 123
 124                 // Create a Location object and cache it.
 125                 const std::string cname(country_name.utf8_string, country_name.data_size);
 126                 Geolocation::Location* location = new Geolocation::Location(code, cname);
 127                 locations[code] = location;
 128                 return location;
 129         }
 130 };
 131
 132 class ModuleGeoMaxMind : public Module
 133 {
 134  private:
 135         GeolocationAPIImpl geoapi;
 136
 137  public:
 138         ModuleGeoMaxMind()
 139                 : geoapi(this)
 140         {
 141                 memset(&geoapi.mmdb, 0, sizeof(geoapi.mmdb));
 142         }
 143
 144         ~ModuleGeoMaxMind()
 145         {
 146                 MMDB_close(&geoapi.mmdb);
 147         }
 148
 149         Version GetVersion() CXX11_OVERRIDE
 150         {
 151                 return Version("Provides Geolocation lookups using the libMaxMindDB library", VF_VENDOR);
 152         }
 153
 154         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 155         {
 156                 ConfigTag* tag = ServerInstance->Config->ConfValue("maxmind");
 157                 const std::string file = ServerInstance->Config->Paths.PrependConfig(tag->getString("file", "GeoLite2-Country.mmdb"));
 158
 159                 // Try to read the new database.
 160                 MMDB_s mmdb;
 161                 int result = MMDB_open(file.c_str(), MMDB_MODE_MMAP, &mmdb);
 162                 if (result != MMDB_SUCCESS)
 163                         throw ModuleException(InspIRCd::Format("Unable to load the MaxMind database (%s): %s",
 164                                 file.c_str(), MMDB_strerror(result)));
 165
 166                 // Swap the new database with the old database.
 167                 std::swap(mmdb, geoapi.mmdb);
 168
 169                 // Free the old database.
 170                 MMDB_close(&mmdb);
 171         }
 172
 173         void OnGarbageCollect() CXX11_OVERRIDE
 174         {
 175                 for (LocationMap::iterator iter = geoapi.locations.begin(); iter != geoapi.locations.end(); )
 176                 {
 177                         Geolocation::Location* location = iter->second;
 178                         if (location->GetUseCount())
 179                         {
 180                                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Preserving geolocation data for %s (%s) with use count %u... ",
 181                                         location->GetName().c_str(), location->GetCode().c_str(), location->GetUseCount());
 182                                 iter++;
 183                         }
 184                         else
 185                         {
 186                                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Deleting unused geolocation data for %s (%s)",
 187                                         location->GetName().c_str(), location->GetCode().c_str());
 188                                 delete location;
 189                                 iter = geoapi.locations.erase(iter);
 190                         }
 191                 }
 192         }
 193
 194         void OnSetUserIP(LocalUser* user) CXX11_OVERRIDE
 195         {
 196                 // Unset the extension so that the location of this user is looked
 197                 // up again next time it is requested.
 198                 geoapi.ext.unset(user);
 199         }
 200 };
 201
 202 MODULE_INIT(ModuleGeoMaxMind)