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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2019 Peter Powell <petpow@saberuk.com>
*
* This file is part of InspIRCd. InspIRCd 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, version 2.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/// $CompilerFlags: find_compiler_flags("libmaxminddb")
/// $LinkerFlags: find_linker_flags("libmaxminddb")
/// $PackageInfo: require_system("darwin") libmaxminddb pkg-config
/// $PackageInfo: require_system("debian" "9.0") libmaxminddb-dev pkg-config
/// $PackageInfo: require_system("ubuntu" "16.04") libmaxminddb-dev pkg-config
#ifdef _WIN32
# pragma comment(lib, "libmaxminddb.lib")
#endif
#include <maxminddb.h>
#include "inspircd.h"
#include "modules/geolocation.h"
class GeolocationExtItem : public LocalExtItem
{
public:
GeolocationExtItem(Module* parent)
: LocalExtItem("geolocation", ExtensionItem::EXT_USER, parent)
{
}
void free(Extensible* container, void* item) CXX11_OVERRIDE
{
Geolocation::Location* old = static_cast<Geolocation::Location*>(item);
if (old)
old->refcount_dec();
}
Geolocation::Location* get(const Extensible* item) const
{
return static_cast<Geolocation::Location*>(get_raw(item));
}
void set(Extensible* item, Geolocation::Location* value)
{
value->refcount_inc();
free(item, set_raw(item, value));
}
void unset(Extensible* container)
{
free(container, unset_raw(container));
}
};
typedef insp::flat_map<std::string, Geolocation::Location*> LocationMap;
class GeolocationAPIImpl : public Geolocation::APIBase
{
public:
GeolocationExtItem ext;
LocationMap locations;
MMDB_s mmdb;
GeolocationAPIImpl(Module* parent)
: Geolocation::APIBase(parent)
, ext(parent)
{
}
Geolocation::Location* GetLocation(User* user) CXX11_OVERRIDE
{
// If we have the location cached then use that instead.
Geolocation::Location* location = ext.get(user);
if (location)
return location;
// Attempt to locate this user.
location = GetLocation(user->client_sa);
if (!location)
return NULL;
// We found the user. Cache their location for future use.
ext.set(user, location);
return location;
}
Geolocation::Location* GetLocation(irc::sockets::sockaddrs& sa) CXX11_OVERRIDE
{
// Attempt to look up the socket address.
int result;
MMDB_lookup_result_s lookup = MMDB_lookup_sockaddr(&mmdb, &sa.sa, &result);
if (result != MMDB_SUCCESS || !lookup.found_entry)
return NULL;
// Attempt to retrieve the country code.
MMDB_entry_data_s country_code;
result = MMDB_get_value(&lookup.entry, &country_code, "country", "iso_code", NULL);
if (result != MMDB_SUCCESS || !country_code.has_data || country_code.type != MMDB_DATA_TYPE_UTF8_STRING || country_code.data_size != 2)
return NULL;
// If the country has been seen before then use our cached Location object.
const std::string code(country_code.utf8_string, country_code.data_size);
LocationMap::iterator liter = locations.find(code);
if (liter != locations.end())
return liter->second;
// Attempt to retrieve the country name.
MMDB_entry_data_s country_name;
result = MMDB_get_value(&lookup.entry, &country_name, "country", "names", "en", NULL);
if (result != MMDB_SUCCESS || !country_name.has_data || country_name.type != MMDB_DATA_TYPE_UTF8_STRING)
return NULL;
// Create a Location object and cache it.
const std::string cname(country_name.utf8_string, country_name.data_size);
Geolocation::Location* location = new Geolocation::Location(code, cname);
locations[code] = location;
return location;
}
};
class ModuleGeoMaxMind : public Module
{
private:
GeolocationAPIImpl geoapi;
public:
ModuleGeoMaxMind()
: geoapi(this)
{
memset(&geoapi.mmdb, 0, sizeof(geoapi.mmdb));
}
~ModuleGeoMaxMind()
{
MMDB_close(&geoapi.mmdb);
}
Version GetVersion() CXX11_OVERRIDE
{
return Version("Provides Geolocation lookups using the libMaxMindDB library", VF_VENDOR);
}
void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
{
ConfigTag* tag = ServerInstance->Config->ConfValue("maxmind");
const std::string file = ServerInstance->Config->Paths.PrependConfig(tag->getString("file", "GeoLite2-Country.mmdb"));
// Try to read the new database.
MMDB_s mmdb;
int result = MMDB_open(file.c_str(), MMDB_MODE_MMAP, &mmdb);
if (result != MMDB_SUCCESS)
throw ModuleException(InspIRCd::Format("Unable to load the MaxMind database (%s): %s",
file.c_str(), MMDB_strerror(result)));
// Swap the new database with the old database.
std::swap(mmdb, geoapi.mmdb);
// Free the old database.
MMDB_close(&mmdb);
}
void OnGarbageCollect() CXX11_OVERRIDE
{
for (LocationMap::iterator iter = geoapi.locations.begin(); iter != geoapi.locations.end(); )
{
Geolocation::Location* location = iter->second;
if (location->GetUseCount())
{
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Preserving geolocation data for %s (%s) with use count %u... ",
location->GetName().c_str(), location->GetCode().c_str(), location->GetUseCount());
iter++;
}
else
{
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Deleting unused geolocation data for %s (%s)",
location->GetName().c_str(), location->GetCode().c_str());
delete location;
iter = geoapi.locations.erase(iter);
}
}
}
void OnSetUserIP(LocalUser* user) CXX11_OVERRIDE
{
// Unset the extension so that the location of this user is looked
// up again next time it is requested.
geoapi.ext.unset(user);
}
};
MODULE_INIT(ModuleGeoMaxMind)
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