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/* Copyright (C) 2011 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 <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <assert.h>
#include <getopt.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <locale.h>
#include "utils/common/params.h"
#include "common/base32hex.h"
#include "common/errcode.h"
#include "common/hex.h"
#include "common/strtonum.h"
#include "libknot/dnssec/crypto.h"
#include "libknot/dnssec/nsec3.h"
#define PROGRAM_NAME "knsec3hash"
/*!
* \brief Print program usage (and example).
*/
static void usage(FILE *stream)
{
fprintf(stream, "usage: " PROGRAM_NAME " "
"<salt> <algorithm> <iterations> <domain-name>\n");
fprintf(stream, "example: " PROGRAM_NAME " "
"c01dcafe 1 10 knot-dns.cz\n");
}
/*!
* \brief Parse NSEC3 parameters and fill structure with NSEC3 parameters.
*/
static bool parse_nsec3_params(knot_nsec3_params_t *params, const char *salt,
const char *algorithm, const char *iterations)
{
int result;
result = knot_str2uint8t(algorithm, ¶ms->algorithm);
if (result != KNOT_EOK) {
fprintf(stderr, "Invalid algorithm number.\n");
return false;
}
result = knot_str2uint16t(iterations, ¶ms->iterations);
if (result != KNOT_EOK) {
fprintf(stderr, "Invalid iteration count: %s\n",
knot_strerror(result));
return false;
}
size_t salt_length = 0;
uint8_t *salt_data = NULL;
if (salt[0] != '\0') {
result = hex_decode(salt, &salt_data, &salt_length);
if (result != KNOT_EOK) {
fprintf(stderr, "Invalid salt: %s\n",
knot_strerror(result));
return false;
}
}
if (salt_length > UINT8_MAX) {
fprintf(stderr, "Invalid salt: Maximal length is %d bytes.\n",
UINT8_MAX);
free(salt_data);
return false;
}
params->salt = salt_data;
params->salt_length = (uint8_t)salt_length;
return true;
}
/*!
* \brief Entry point of 'knsec3hash'.
*/
int main(int argc, char *argv[])
{
bool enable_idn = true;
struct option options[] = {
{ "version", no_argument, 0, 'V' },
{ "help", no_argument, 0, 'h' },
{ NULL }
};
#ifdef LIBIDN
// Set up localization.
if (setlocale(LC_CTYPE, "") == NULL) {
enable_idn = false;
}
#endif
int opt = 0;
int li = 0;
while ((opt = getopt_long(argc, argv, "hV", options, &li)) != -1) {
switch(opt) {
case 'V':
printf("%s, version %s\n", PROGRAM_NAME, PACKAGE_VERSION);
return 0;
case 'h':
usage(stdout);
return 0;
default:
usage(stderr);
return 1;
}
}
// knsec3hash <salt> <algorithm> <iterations> <domain>
if (argc != 5) {
usage(stderr);
return 1;
}
atexit(knot_crypto_cleanup);
int exit_code = 1;
knot_nsec3_params_t nsec3_params = { 0 };
knot_dname_t *dname = NULL;
uint8_t *digest = NULL;
size_t digest_size = 0;
uint8_t *b32_digest = NULL;
int32_t b32_length = 0;
int result = 0;
if (!parse_nsec3_params(&nsec3_params, argv[1], argv[2], argv[3])) {
goto fail;
}
if (enable_idn) {
char *ascii_name = name_from_idn(argv[4]);
if (ascii_name == NULL) {
fprintf(stderr, "Cannot transform IDN domain name.\n");
goto fail;
}
dname = knot_dname_from_str(ascii_name);
free(ascii_name);
} else {
dname = knot_dname_from_str(argv[4]);
}
if (dname == NULL) {
fprintf(stderr, "Cannot parse domain name.\n");
goto fail;
}
result = knot_nsec3_hash(&nsec3_params, dname, knot_dname_size(dname),
&digest, &digest_size);
if (result != KNOT_EOK) {
fprintf(stderr, "Cannot compute hash: %s\n",
knot_strerror(result));
goto fail;
}
b32_length = base32hex_encode_alloc(digest, digest_size, &b32_digest);
if (b32_length < 0) {
fprintf(stderr, "Cannot encode computed hash: %s\n",
knot_strerror(b32_length));
goto fail;
}
exit_code = 0;
printf("%.*s (salt=%s, hash=%d, iterations=%d)\n", b32_length,
b32_digest, argv[1], nsec3_params.algorithm,
nsec3_params.iterations);
fail:
knot_nsec3_params_free(&nsec3_params);
knot_dname_free(&dname);
free(digest);
free(b32_digest);
return exit_code;
}
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