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hostname_ids.c
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hostname_ids.c
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/**
* ratched - TLS connection router that performs a man-in-the-middle attack
* Copyright (C) 2017-2017 Johannes Bauer
*
* This file is part of ratched.
*
* ratched 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; this program is ONLY licensed under
* version 3 of the License, later versions are explicitly excluded.
*
* ratched 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 ratched; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Johannes Bauer <JohannesBauer@gmx.de>
**/
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include "logging.h"
#include "hostname_ids.h"
#include "map.h"
static struct map_t *ip_to_hostnames;
/* ip_to_hostnames = {
* 0x11223344: {
* "foobar": 1,
* "barfoo": 2,
* "mookoo": 3,
* },
* 0x22334455: {
* "moo.com": 1,
* "bar.de": 2,
* },
* }
*/
unsigned int resolve_hostname_id(uint32_t ipv4_nbo, const char *hostname) {
if (!hostname) {
return 0;
}
struct map_t *map = map_get(ip_to_hostnames, &ipv4_nbo, sizeof(uint32_t));
if (!map) {
/* No entry for that IP address so far */
map = map_new();
if (!map) {
logmsg(LLVL_FATAL, "Unable to create inner map for hostname entry for \"%s\", returning 0.", hostname);
return 0;
}
if (!map_set_ptr(ip_to_hostnames, &ipv4_nbo, sizeof(uint32_t), map)) {
logmsg(LLVL_FATAL, "Unable to register inner map for hostname entry for \"%s\", returning 0.", hostname);
map_free(map);
return 0;
}
}
int hostname_id = strmap_get_int(map, hostname);
if (hostname_id == -1) {
hostname_id = map->element_count + 1;
strmap_set_int(map, hostname, hostname_id);
}
return hostname_id;
}
void init_hostname_ids(void) {
ip_to_hostnames = map_new();
}
static void free_inner_map(void *inner_map) {
map_free((struct map_t*)inner_map);
}
void deinit_hostname_ids(void) {
map_foreach_ptrvalue(ip_to_hostnames, free_inner_map);
map_free(ip_to_hostnames);
}