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/* Copyright (C) 2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program 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, either version 3 of the License, or
(at your option) any later version.
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 <https://www.gnu.org/licenses/>.
*/
#include "knot/modules/geoip/geodb.h"
#include "contrib/strtonum.h"
#include "contrib/string.h"
#if HAVE_MAXMINDDB
static const uint16_t type_map[] = {
[GEODB_KEY_ID] = MMDB_DATA_TYPE_UINT32,
[GEODB_KEY_TXT] = MMDB_DATA_TYPE_UTF8_STRING
};
#endif
int parse_geodb_path(geodb_path_t *path, const char *input)
{
if (path == NULL || input == NULL) {
return -1;
}
// Parse optional type of key.
path->type = GEODB_KEY_TXT;
const char *delim = input;
if (input[0] == '(') {
delim = strchr(input, ')');
if (delim == NULL) {
return -1;
}
input++;
char *type = sprintf_alloc("%.*s", (int)(delim - input), input);
const knot_lookup_t *table = knot_lookup_by_name(geodb_key_types, type);
free(type);
if (table == NULL) {
return -1;
}
path->type = table->id;
input = delim + 1;
}
// Parse the path.
uint16_t len = 0;
while (1) {
delim = strchr(input, '/');
if (delim == NULL) {
delim = input + strlen(input);
}
path->path[len] = malloc(delim - input + 1);
if (path->path[len] == NULL) {
return -1;
}
memcpy(path->path[len], input, delim - input);
path->path[len][delim - input] = '\0';
len++;
if (*delim == 0 || len == GEODB_MAX_PATH_LEN) {
break;
}
input = delim + 1;
}
return 0;
}
int parse_geodb_data(const char *input, void **geodata, uint32_t *geodata_len,
uint8_t *geodepth, geodb_path_t *path, uint16_t path_cnt)
{
for (uint16_t i = 0; i < path_cnt; i++) {
const char *delim = strchr(input, ';');
if (delim == NULL) {
delim = input + strlen(input);
}
uint16_t key_len = delim - input;
if (key_len > 0 && !(key_len == 1 && *input == '*')) {
*geodepth = i + 1;
switch (path[i].type) {
case GEODB_KEY_TXT:
geodata[i] = malloc(key_len + 1);
if (geodata[i] == NULL) {
return -1;
}
memcpy(geodata[i], input, key_len);
((char *)geodata[i])[key_len] = '\0';
geodata_len[i] = key_len;
break;
case GEODB_KEY_ID:
geodata[i] = malloc(sizeof(uint32_t));
if (geodata[i] == NULL) {
return -1;
}
if (str_to_u32(input, (uint32_t *)geodata[i]) != KNOT_EOK) {
return -1;
}
geodata_len[i] = sizeof(uint32_t);
break;
default:
assert(0);
return -1;
}
}
if (*delim == '\0') {
break;
}
input = delim + 1;
}
return 0;
}
bool geodb_available(void)
{
#if HAVE_MAXMINDDB
return true;
#else
return false;
#endif
}
geodb_t *geodb_open(const char *filename)
{
#if HAVE_MAXMINDDB
MMDB_s *db = calloc(1, sizeof(MMDB_s));
if (db == NULL) {
return NULL;
}
int mmdb_error = MMDB_open(filename, MMDB_MODE_MMAP, db);
if (mmdb_error != MMDB_SUCCESS) {
free(db);
return NULL;
}
return db;
#else
return NULL;
#endif
}
void geodb_close(geodb_t *geodb)
{
#if HAVE_MAXMINDDB
MMDB_close(geodb);
#endif
}
int geodb_query(geodb_t *geodb, geodb_data_t *entries, struct sockaddr *remote,
geodb_path_t *paths, uint16_t path_cnt, uint16_t *netmask)
{
#if HAVE_MAXMINDDB
int mmdb_error = 0;
MMDB_lookup_result_s res;
res = MMDB_lookup_sockaddr(geodb, remote, &mmdb_error);
if (mmdb_error != MMDB_SUCCESS || !res.found_entry) {
return -1;
}
// Save netmask.
*netmask = res.netmask;
for (uint16_t i = 0; i < path_cnt; i++) {
// Get the value of the next key.
mmdb_error = MMDB_aget_value(&res.entry, &entries[i], (const char *const*)paths[i].path);
if (mmdb_error != MMDB_SUCCESS && mmdb_error != MMDB_LOOKUP_PATH_DOES_NOT_MATCH_DATA_ERROR) {
return -1;
}
if (mmdb_error == MMDB_LOOKUP_PATH_DOES_NOT_MATCH_DATA_ERROR || !entries[i].has_data) {
entries[i].has_data = false;
continue;
}
// Check the type.
if (entries[i].type != type_map[paths[i].type]) {
entries[i].has_data = false;
continue;
}
}
return 0;
#else
return -1;
#endif
}
void geodb_fill_geodata(geodb_data_t *entries, uint16_t path_cnt,
void **geodata, uint32_t *geodata_len, uint8_t *geodepth)
{
#if HAVE_MAXMINDDB
for (int i = 0; i < path_cnt; i++) {
if (entries[i].has_data) {
*geodepth = i + 1;
switch (entries[i].type) {
case MMDB_DATA_TYPE_UTF8_STRING:
geodata[i] = (void *)entries[i].utf8_string;
geodata_len[i] = entries[i].data_size;
break;
case MMDB_DATA_TYPE_UINT32:
geodata[i] = (void *)&entries[i].uint32;
geodata_len[i] = sizeof(uint32_t);
break;
default:
assert(0);
break;
}
}
}
#else
return;
#endif
}
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