src/modules/extra/m_geo_maxmind.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2019-2020 Sadie Powell <sadie@witchery.services>
   5  *   Copyright (C) 2019 Matt Schatz <genius3000@g3k.solutions>
   6  *
   7  * This file is part of InspIRCd.  InspIRCd is free software: you can
   8  * redistribute it and/or modify it under the terms of the GNU General Public
   9  * License as published by the Free Software Foundation, version 2.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  14  * details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /// $CompilerFlags: require_version("libmaxminddb" "0" "1.2.1") warning("The version of libmaxminddb you are using may cause a segmentation fault if given a corrupt database file!")
  21 /// $CompilerFlags: find_compiler_flags("libmaxminddb" "")
  22
  23 /// $LinkerFlags: find_linker_flags("libmaxminddb" "-lmaxminddb")
  24
  25 /// $PackageInfo: require_system("arch") libmaxminddb pkgconf
  26 /// $PackageInfo: require_system("darwin") libmaxminddb pkg-config
  27 /// $PackageInfo: require_system("debian" "9.0") libmaxminddb-dev pkg-config
  28 /// $PackageInfo: require_system("ubuntu" "16.04") libmaxminddb-dev pkg-config
  29
  30 #ifdef _WIN32
  31 # pragma comment(lib, "libmaxminddb.lib")
  32 #endif
  33
  34 #include "inspircd.h"
  35 #include "modules/geolocation.h"
  36 #include <maxminddb.h>
  37
  38 class GeolocationExtItem : public ExtensionItem
  39 {
  40  public:
  41         GeolocationExtItem(Module* parent)
  42                 : ExtensionItem("geolocation", ExtensionItem::EXT_USER, parent)
  43         {
  44         }
  45
  46         void free(Extensible* container, void* item) CXX11_OVERRIDE
  47         {
  48                 Geolocation::Location* old = static_cast<Geolocation::Location*>(item);
  49                 if (old)
  50                         old->refcount_dec();
  51         }
  52
  53         Geolocation::Location* get(const Extensible* item) const
  54         {
  55                 return static_cast<Geolocation::Location*>(get_raw(item));
  56         }
  57
  58         void set(Extensible* item, Geolocation::Location* value)
  59         {
  60                 value->refcount_inc();
  61                 free(item, set_raw(item, value));
  62         }
  63
  64         void unset(Extensible* container)
  65         {
  66                 free(container, unset_raw(container));
  67         }
  68 };
  69
  70 typedef insp::flat_map<std::string, Geolocation::Location*> LocationMap;
  71
  72 class GeolocationAPIImpl : public Geolocation::APIBase
  73 {
  74  public:
  75         GeolocationExtItem ext;
  76         LocationMap locations;
  77         MMDB_s mmdb;
  78
  79         GeolocationAPIImpl(Module* parent)
  80                 : Geolocation::APIBase(parent)
  81                 , ext(parent)
  82         {
  83         }
  84
  85         Geolocation::Location* GetLocation(User* user) CXX11_OVERRIDE
  86         {
  87                 // If we have the location cached then use that instead.
  88                 Geolocation::Location* location = ext.get(user);
  89                 if (location)
  90                         return location;
  91
  92                 // Attempt to locate this user.
  93                 location = GetLocation(user->client_sa);
  94                 if (!location)
  95                         return NULL;
  96
  97                 // We found the user. Cache their location for future use.
  98                 ext.set(user, location);
  99                 return location;
 100         }
 101
 102         Geolocation::Location* GetLocation(irc::sockets::sockaddrs& sa) CXX11_OVERRIDE
 103         {
 104                 // Skip trying to look up a UNIX socket.
 105                 if (sa.family() != AF_INET && sa.family() != AF_INET6)
 106                         return NULL;
 107
 108                 // Attempt to look up the socket address.
 109                 int result;
 110                 MMDB_lookup_result_s lookup = MMDB_lookup_sockaddr(&mmdb, &sa.sa, &result);
 111                 if (result != MMDB_SUCCESS || !lookup.found_entry)
 112                         return NULL;
 113
 114                 // Attempt to retrieve the country code.
 115                 MMDB_entry_data_s country_code;
 116                 result = MMDB_get_value(&lookup.entry, &country_code, "country", "iso_code", NULL);
 117                 if (result != MMDB_SUCCESS || !country_code.has_data || country_code.type != MMDB_DATA_TYPE_UTF8_STRING || country_code.data_size != 2)
 118                         return NULL;
 119
 120                 // If the country has been seen before then use our cached Location object.
 121                 const std::string code(country_code.utf8_string, country_code.data_size);
 122                 LocationMap::iterator liter = locations.find(code);
 123                 if (liter != locations.end())
 124                         return liter->second;
 125
 126                 // Attempt to retrieve the country name.
 127                 MMDB_entry_data_s country_name;
 128                 result = MMDB_get_value(&lookup.entry, &country_name, "country", "names", "en", NULL);
 129                 if (result != MMDB_SUCCESS || !country_name.has_data || country_name.type != MMDB_DATA_TYPE_UTF8_STRING)
 130                         return NULL;
 131
 132                 // Create a Location object and cache it.
 133                 const std::string cname(country_name.utf8_string, country_name.data_size);
 134                 Geolocation::Location* location = new Geolocation::Location(code, cname);
 135                 locations[code] = location;
 136                 return location;
 137         }
 138 };
 139
 140 class ModuleGeoMaxMind : public Module
 141 {
 142  private:
 143         GeolocationAPIImpl geoapi;
 144
 145  public:
 146         ModuleGeoMaxMind()
 147                 : geoapi(this)
 148         {
 149                 memset(&geoapi.mmdb, 0, sizeof(geoapi.mmdb));
 150         }
 151
 152         ~ModuleGeoMaxMind()
 153         {
 154                 MMDB_close(&geoapi.mmdb);
 155         }
 156
 157         Version GetVersion() CXX11_OVERRIDE
 158         {
 159                 return Version("Allows the server to perform geolocation lookups on both IP addresses and users.", VF_VENDOR);
 160         }
 161
 162         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 163         {
 164                 ConfigTag* tag = ServerInstance->Config->ConfValue("maxmind");
 165                 const std::string file = ServerInstance->Config->Paths.PrependConfig(tag->getString("file", "GeoLite2-Country.mmdb", 1));
 166
 167                 // Try to read the new database.
 168                 MMDB_s mmdb;
 169                 int result = MMDB_open(file.c_str(), MMDB_MODE_MMAP, &mmdb);
 170                 if (result != MMDB_SUCCESS)
 171                         throw ModuleException(InspIRCd::Format("Unable to load the MaxMind database (%s): %s",
 172                                 file.c_str(), MMDB_strerror(result)));
 173
 174                 // Swap the new database with the old database.
 175                 std::swap(mmdb, geoapi.mmdb);
 176
 177                 // Free the old database.
 178                 MMDB_close(&mmdb);
 179         }
 180
 181         void OnGarbageCollect() CXX11_OVERRIDE
 182         {
 183                 for (LocationMap::iterator iter = geoapi.locations.begin(); iter != geoapi.locations.end(); )
 184                 {
 185                         Geolocation::Location* location = iter->second;
 186                         if (location->GetUseCount())
 187                         {
 188                                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Preserving geolocation data for %s (%s) with use count %u... ",
 189                                         location->GetName().c_str(), location->GetCode().c_str(), location->GetUseCount());
 190                                 iter++;
 191                         }
 192                         else
 193                         {
 194                                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Deleting unused geolocation data for %s (%s)",
 195                                         location->GetName().c_str(), location->GetCode().c_str());
 196                                 delete location;
 197                                 iter = geoapi.locations.erase(iter);
 198                         }
 199                 }
 200         }
 201
 202         void OnSetUserIP(LocalUser* user) CXX11_OVERRIDE
 203         {
 204                 // Unset the extension so that the location of this user is looked
 205                 // up again next time it is requested.
 206                 geoapi.ext.unset(user);
 207         }
 208 };
 209
 210 MODULE_INIT(ModuleGeoMaxMind)