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/*
* Copyright (c) 2018 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* 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/>.
*
* Authors:
* Martin Sehnoutka <msehnout@redhat.com>
*/
#define _GNU_SOURCE
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include "ipcalc.h"
#ifdef USE_MAXMIND
#include <maxminddb.h>
#ifndef MAXMINDDB_LOCATION_COUNTRY
#define MAXMINDDB_LOCATION_COUNTRY "/usr/share/GeoIP/GeoLite2-Country.mmdb"
#endif
#ifndef MAXMINDDB_LOCATION_CITY
#define MAXMINDDB_LOCATION_CITY "/usr/share/GeoIP/GeoLite2-City.mmdb"
#endif
#ifdef USE_RUNTIME_LINKING
# include <dlfcn.h>
# define LIBNAME LIBPATH"/libmaxminddb.so.0"
typedef int (*MMDB_open_fn)
(const char *const filename,
uint32_t flags,
MMDB_s *const mmdb);
typedef void (*MMDB_close_fn)
(MMDB_s *const mmdb);
typedef MMDB_lookup_result_s (*MMDB_lookup_string_fn)
(MMDB_s *const mmdb,
const char *const ipstr,
int *const gai_error,
int *const mmdb_error);
typedef int (*MMDB_get_value_fn)
(MMDB_entry_s *const start,
MMDB_entry_data_s *const entry_data,
...);
static MMDB_close_fn pMMDB_close;
static MMDB_get_value_fn pMMDB_get_value;
static MMDB_lookup_string_fn pMMDB_lookup_string;
static MMDB_open_fn pMMDB_open;
int geo_setup(void)
{
static void *ld = NULL;
static int ret = 0;
static char err[256] = {0};
if (ld != NULL || ret != 0) {
if (!beSilent && err[0] != 0) {
fprintf(stderr, "%s", err);
}
return ret;
}
ld = dlopen(LIBNAME, RTLD_LAZY);
if (ld == NULL) {
snprintf(err, sizeof(err), "ipcalc: could not open %s\n", LIBNAME);
ret = -1;
goto exit;
}
pMMDB_close = dlsym(ld, "MMDB_close");
pMMDB_get_value = dlsym(ld, "MMDB_get_value");
pMMDB_lookup_string = dlsym(ld, "MMDB_lookup_string");
pMMDB_open = dlsym(ld, "MMDB_open");
if(pMMDB_close == NULL ||
pMMDB_get_value == NULL ||
pMMDB_lookup_string == NULL ||
pMMDB_open == NULL) {
snprintf(err, sizeof(err), "ipcalc: could not find symbols in libmaxmind\n");
ret = -1;
goto exit;
}
ret = 0;
exit:
return ret;
}
#else
#define pMMDB_close MMDB_close
#define pMMDB_get_value MMDB_get_value
#define pMMDB_lookup_string MMDB_lookup_string
#define pMMDB_open MMDB_open
#endif
void process_result_from_mmdb_lookup(MMDB_entry_data_s *entry_data, int status, char **output)
{
if (MMDB_SUCCESS == status) {
if (entry_data->has_data) {
if (entry_data->type == MMDB_DATA_TYPE_UTF8_STRING) {
*output = (char *) calloc(entry_data->data_size + 1, sizeof(char));
if (NULL != *output) {
memcpy(*output, entry_data->utf8_string, entry_data->data_size);
} else {
fprintf(stderr, "Memory allocation failure line %d\n", __LINE__);
}
}
}
}
/* Else fail silently */
}
void geo_ip_lookup(const char *ip, char **country, char **ccode, char **city, char **coord)
{
MMDB_s mmdb;
MMDB_entry_data_s entry_data;
int gai_error, mmdb_error, status, coordinates=0;
double latitude = 0, longitude = 0;
if (geo_setup() != 0)
return;
/* Open the system maxmind database with countries */
status = pMMDB_open(MAXMINDDB_LOCATION_COUNTRY, MMDB_MODE_MMAP, &mmdb);
if (MMDB_SUCCESS == status) {
/* Lookup IP address in the database */
MMDB_lookup_result_s result = pMMDB_lookup_string(&mmdb, ip, &gai_error, &mmdb_error);
if (MMDB_SUCCESS == mmdb_error) {
/* If the lookup was successfull and an entry was found */
if (result.found_entry) {
memset(&entry_data, 0, sizeof(MMDB_entry_data_s));
/* Travel the path in the tree like structure of the MMDB and store the value if found */
status = pMMDB_get_value(&result.entry, &entry_data, "country", "names", "en", NULL);
process_result_from_mmdb_lookup(&entry_data, status, country);
memset(&entry_data, 0, sizeof(MMDB_entry_data_s));
status = pMMDB_get_value(&result.entry, &entry_data, "country", "iso_code", NULL);
process_result_from_mmdb_lookup(&entry_data, status, ccode);
}
}
/* Else fail silently */
pMMDB_close(&mmdb);
}
/* Else fail silently */
/* Open the system maxmind database with cities - which actually does not contain names of the cities */
status = pMMDB_open(MAXMINDDB_LOCATION_CITY, MMDB_MODE_MMAP, &mmdb);
if (MMDB_SUCCESS == status) {
/* Lookup IP address in the database */
MMDB_lookup_result_s result = pMMDB_lookup_string(&mmdb, ip, &gai_error, &mmdb_error);
if (MMDB_SUCCESS == mmdb_error) {
/* If the lookup was successfull and an entry was found */
if (result.found_entry) {
memset(&entry_data, 0, sizeof(MMDB_entry_data_s));
// NOTE: Information about the city is not available in the free database, so there is not way
// for me to implement this functionality right now, but it should be easy to add for anyone with
// access to the paid databases.
status = pMMDB_get_value(&result.entry, &entry_data, "location", "latitude", NULL);
if (MMDB_SUCCESS == status) {
if (entry_data.has_data) {
if (entry_data.type == MMDB_DATA_TYPE_DOUBLE) {
latitude = entry_data.double_value;
++coordinates;
}
}
}
status = pMMDB_get_value(&result.entry, &entry_data, "location", "longitude", NULL);
if (MMDB_SUCCESS == status) {
if (entry_data.has_data) {
if (entry_data.type == MMDB_DATA_TYPE_DOUBLE) {
longitude = entry_data.double_value;
++coordinates;
}
}
}
if (coordinates == 2) {
safe_asprintf(coord, "%f,%f", latitude, longitude);
}
}
}
/* Else fail silently */
pMMDB_close(&mmdb);
}
/* Else fail silently */
}
#endif
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