2024-09-24 14:54:57 +02:00

394 lines
11 KiB
C

/*
* GeoIPCity.c
*
* Copyright (C) 2006 MaxMind LLC
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* This library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <GeoIP.h>
#include <GeoIP_internal.h>
#include <GeoIPCity.h>
#if !defined(_WIN32)
#include <unistd.h>
#include <netdb.h>
#include <netinet/in.h> /* For ntohl */
#else
#include <windows.h>
#include <winsock.h>
#endif
#include <sys/types.h> /* For uint32_t */
#ifdef HAVE_STDINT_H
#include <stdint.h> /* For uint32_t */
#endif
static
const int FULL_RECORD_LENGTH = 50;
static const int CITYCONFIDENCE_FIXED_RECORD = 4;
static const int CITYCONFIDENCEDIST_FIXED_RECORD = 6;
static
GeoIPRecord *
_extract_record(GeoIP * gi, unsigned int seek_record, int *next_record_ptr)
{
int record_pointer;
unsigned char *record_buf = NULL;
unsigned char *begin_record_buf = NULL;
GeoIPRecord *record;
int str_length = 0;
int j;
double latitude = 0, longitude = 0;
int metroarea_combo = 0;
int bytes_read = 0;
if (seek_record == gi->databaseSegments[0])
return NULL;
record = malloc(sizeof(GeoIPRecord));
memset(record, 0, sizeof(GeoIPRecord));
record->charset = gi->charset;
if (gi->databaseType == GEOIP_CITYCONFIDENCE_EDITION
|| gi->databaseType == GEOIP_CITYCONFIDENCEDIST_EDITION) {
int fixed_rec_size = gi->record_length +
((gi->databaseType == GEOIP_CITYCONFIDENCE_EDITION)
? CITYCONFIDENCE_FIXED_RECORD
: CITYCONFIDENCEDIST_FIXED_RECORD);
//allocate max rec size, even for CITYCONFIDENCE_FIXED_RECORD
//+4 is the max_record_length
// TODO
unsigned char tmp_fixed_record[6/*CITYCONFIDENCEDIST_FIXED_RECORD*/ + 4];
int dseg = gi->databaseSegments[0] * gi->record_length * 2 + gi->record_length;
// int aligned_dseg = dseg ;
int offset = seek_record - gi->databaseSegments[0] - 1; /* -1 b/c zero is not
* found. but the array
* start with 0 */
record_pointer = offset * fixed_rec_size + dseg + gi->dyn_seg_size;
if (gi->cache == NULL) {
/* read from disk */
bytes_read = pread(fileno(gi->GeoIPDatabase), tmp_fixed_record, fixed_rec_size, record_pointer);
if (bytes_read != fixed_rec_size)
return NULL;
record->country_conf = tmp_fixed_record[0];
record->region_conf = tmp_fixed_record[1];
record->city_conf = tmp_fixed_record[2];
record->postal_conf = tmp_fixed_record[3];
record->accuracy_radius =
gi->databaseType == GEOIP_CITYCONFIDENCEDIST_EDITION
? ((tmp_fixed_record[4] + (tmp_fixed_record[5] << 8)) & 0x3ff) : 0x3ff;
int t = fixed_rec_size - gi->record_length;
record_pointer = dseg + tmp_fixed_record[t] +
(tmp_fixed_record[t + 1] << 8) + (tmp_fixed_record[t + 2] << 16) ;
if (gi->record_length == 4)
record_pointer += (tmp_fixed_record[t + 3] << 24);
begin_record_buf = record_buf = malloc(sizeof(char) * FULL_RECORD_LENGTH);
bytes_read = pread(fileno(gi->GeoIPDatabase), record_buf, FULL_RECORD_LENGTH, record_pointer);
if (bytes_read == 0) {
/* eof or other error */
free(begin_record_buf);
free(record);
return NULL;
}
}
else {
record_buf = gi->cache + (long) record_pointer;
record->country_conf = record_buf[0];
record->region_conf = record_buf[1];
record->city_conf = record_buf[2];
record->postal_conf = record_buf[3];
record->accuracy_radius =
gi->databaseType == GEOIP_CITYCONFIDENCEDIST_EDITION
? ((record_buf[4] + (record_buf[5] << 8)) & 0x3ff) : 0x3ff;
int t = fixed_rec_size - gi->record_length;
record_pointer = dseg + record_buf[t] +
(record_buf[t + 1] << 8) + (record_buf[t + 2] << 16) ;
if (gi->record_length == 4)
record_pointer += (record_buf[t + 3] << 24);
record_buf = gi->cache + (long) record_pointer;
}
} /* other city records */
else {
record->country_conf = GEOIP_UNKNOWN_CONF;
record->region_conf = GEOIP_UNKNOWN_CONF;
record->city_conf = GEOIP_UNKNOWN_CONF;
record->postal_conf = GEOIP_UNKNOWN_CONF;
record->accuracy_radius = GEOIP_UNKNOWN_ACCURACY_RADIUS;
record_pointer = seek_record + (2 * gi->record_length - 1) * gi->databaseSegments[0];
if (gi->cache == NULL) {
begin_record_buf = record_buf = malloc(sizeof(char) * FULL_RECORD_LENGTH);
bytes_read = pread(fileno(gi->GeoIPDatabase), record_buf, FULL_RECORD_LENGTH, record_pointer);
if (bytes_read == 0) {
/* eof or other error */
free(begin_record_buf);
free(record);
return NULL;
}
}
else {
record_buf = gi->cache + (long) record_pointer;
}
}
/* get country */
record->continent_code = (char *) GeoIP_country_continent[record_buf[0]];
record->country_code = (char *) GeoIP_country_code[record_buf[0]];
record->country_code3 = (char *) GeoIP_country_code3[record_buf[0]];
record->country_name = (char *) GeoIP_country_name_by_id(gi, record_buf[0]);
record_buf++;
/* get region */
while (record_buf[str_length] != '\0')
str_length++;
if (str_length > 0) {
record->region = malloc(str_length + 1);
strncpy(record->region, (char *) record_buf, str_length + 1);
}
record_buf += str_length + 1;
str_length = 0;
/* get city */
while (record_buf[str_length] != '\0')
str_length++;
if (str_length > 0) {
if (gi->charset == GEOIP_CHARSET_UTF8) {
record->city = _GeoIP_iso_8859_1__utf8((const char *) record_buf);
}
else {
record->city = malloc(str_length + 1);
strncpy(record->city, (const char *) record_buf, str_length + 1);
}
}
record_buf += (str_length + 1);
str_length = 0;
/* get postal code */
while (record_buf[str_length] != '\0')
str_length++;
if (str_length > 0) {
record->postal_code = malloc(str_length + 1);
strncpy(record->postal_code, (char *) record_buf, str_length + 1);
}
record_buf += (str_length + 1);
/* get latitude */
for (j = 0; j < 3; ++j)
latitude += (record_buf[j] << (j * 8));
record->latitude = latitude / 10000 - 180;
record_buf += 3;
/* get longitude */
for (j = 0; j < 3; ++j)
longitude += (record_buf[j] << (j * 8));
record->longitude = longitude / 10000 - 180;
/*
* get area code and metro code for post April 2002 databases and for US
* locations
*/
if (GEOIP_CITY_EDITION_REV1 == gi->databaseType
|| GEOIP_CITYCONFIDENCE_EDITION == gi->databaseType) {
if (!strcmp(record->country_code, "US")) {
record_buf += 3;
for (j = 0; j < 3; ++j)
metroarea_combo += (record_buf[j] << (j * 8));
record->metro_code = metroarea_combo / 1000;
record->area_code = metroarea_combo % 1000;
}
}
if (gi->cache == NULL)
free(begin_record_buf);
/* Used for GeoIP_next_record */
if (next_record_ptr != NULL)
*next_record_ptr = seek_record + record_buf - begin_record_buf + 3;
return record;
}
static
GeoIPRecord *
_get_record(GeoIP * gi, unsigned long ipnum)
{
unsigned int seek_record;
if (gi->databaseType != GEOIP_CITY_EDITION_REV0
&& gi->databaseType != GEOIP_CITY_EDITION_REV1
&& gi->databaseType != GEOIP_CITYCONFIDENCE_EDITION
&& gi->databaseType != GEOIP_CITYCONFIDENCEDIST_EDITION) {
printf("Invalid database type %s, expected %s\n", GeoIPDBDescription[(int) gi->databaseType], GeoIPDBDescription[GEOIP_CITY_EDITION_REV1]);
return 0;
}
seek_record = _GeoIP_seek_record(gi, ipnum);
return _extract_record(gi, seek_record, NULL);
}
static
GeoIPRecord *
_get_record_v6(GeoIP * gi, geoipv6_t ipnum)
{
unsigned int seek_record;
if (gi->databaseType != GEOIP_CITY_EDITION_REV0_V6 &&
gi->databaseType != GEOIP_CITY_EDITION_REV1_V6) {
printf("Invalid database type %s, expected %s\n", GeoIPDBDescription[(int) gi->databaseType], GeoIPDBDescription[GEOIP_CITY_EDITION_REV1_V6]);
return 0;
}
seek_record = _GeoIP_seek_record_v6(gi, ipnum);
return _extract_record(gi, seek_record, NULL);
}
GeoIPRecord *
GeoIP_record_by_ipnum(GeoIP * gi, unsigned long ipnum)
{
return _get_record(gi, ipnum);
}
GeoIPRecord *
GeoIP_record_by_ipnum_v6(GeoIP * gi, geoipv6_t ipnum)
{
return _get_record_v6(gi, ipnum);
}
GeoIPRecord *
GeoIP_record_by_addr(GeoIP * gi, const char *addr)
{
unsigned long ipnum;
if (addr == NULL) {
return 0;
}
ipnum = GeoIP_addr_to_num(addr);
return _get_record(gi, ipnum);
}
GeoIPRecord *
GeoIP_record_by_addr_v6(GeoIP * gi, const char *addr)
{
geoipv6_t ipnum;
if (addr == NULL) {
return 0;
}
ipnum = _GeoIP_addr_to_num_v6(addr);
return _get_record_v6(gi, ipnum);
}
GeoIPRecord *
GeoIP_record_by_name(GeoIP * gi, const char *name)
{
unsigned long ipnum;
if (name == NULL) {
return 0;
}
ipnum = _GeoIP_lookupaddress(name);
return _get_record(gi, ipnum);
}
GeoIPRecord *
GeoIP_record_by_name_v6(GeoIP * gi, const char *name)
{
geoipv6_t ipnum;
if (name == NULL) {
return 0;
}
ipnum = _GeoIP_lookupaddress_v6(name);
return _get_record_v6(gi, ipnum);
}
int
GeoIP_record_id_by_addr(GeoIP * gi, const char *addr)
{
unsigned long ipnum;
if (gi->databaseType != GEOIP_CITY_EDITION_REV0 &&
gi->databaseType != GEOIP_CITY_EDITION_REV1) {
printf("Invalid database type %s, expected %s\n", GeoIPDBDescription[(int) gi->databaseType], GeoIPDBDescription[GEOIP_CITY_EDITION_REV1]);
return 0;
}
if (addr == NULL) {
return 0;
}
ipnum = GeoIP_addr_to_num(addr);
return _GeoIP_seek_record(gi, ipnum);
}
int
GeoIP_record_id_by_addr_v6(GeoIP * gi, const char *addr)
{
geoipv6_t ipnum;
if (gi->databaseType != GEOIP_CITY_EDITION_REV0_V6 &&
gi->databaseType != GEOIP_CITY_EDITION_REV1_V6) {
printf("Invalid database type %s, expected %s\n", GeoIPDBDescription[(int) gi->databaseType], GeoIPDBDescription[GEOIP_CITY_EDITION_REV1]);
return 0;
}
if (addr == NULL) {
return 0;
}
ipnum = _GeoIP_addr_to_num_v6(addr);
return _GeoIP_seek_record_v6(gi, ipnum);
}
int
GeoIP_init_record_iter(GeoIP * gi)
{
return gi->databaseSegments[0] + 1;
}
int
GeoIP_next_record(GeoIP * gi, GeoIPRecord ** gir, int *record_iter)
{
if (gi->cache != NULL) {
printf("GeoIP_next_record not supported in memory cache mode\n");
return 1;
}
*gir = _extract_record(gi, *record_iter, record_iter);
return 0;
}
void
GeoIPRecord_delete(GeoIPRecord * gir)
{
free(gir->region);
free(gir->city);
free(gir->postal_code);
free(gir);
}