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/* Copyright (C) 2023 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 <getopt.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "contrib/base32hex.h"
#include "contrib/string.h"
#include "contrib/strtonum.h"
#include "libdnssec/error.h"
#include "libdnssec/nsec.h"
#include "libknot/libknot.h"
#include "utils/common/msg.h"
#include "utils/common/params.h"
#define PROGRAM_NAME "knsec3hash"
/*!
* \brief Print program help (and example).
*/
static void print_help(void)
{
printf("Usage: " PROGRAM_NAME " [-h | -V] <salt> <algorithm> <iterations> <domain-name>\n");
printf("Example: " PROGRAM_NAME " c01dcafe 1 10 knot-dns.cz\n");
printf("Alternative usage: "PROGRAM_NAME " <algorithm> <flags> <iterations> <salt> <domain-name>\n");
printf("Example: " PROGRAM_NAME " 1 0 10 c01dcafe knot-dns.cz\n");
}
/*!
* \brief Parse NSEC3 salt.
*/
static int str_to_salt(const char *str, dnssec_binary_t *salt)
{
if (strcmp(str, "-") == 0) {
salt->size = 0;
return DNSSEC_EOK;
} else {
salt->data = hex_to_bin(str, &salt->size);
return (salt->data != NULL ? DNSSEC_EOK : DNSSEC_EINVAL);
}
}
/*!
* \brief Parse NSEC3 parameters and fill structure with NSEC3 parameters.
*/
static bool parse_nsec3_params(dnssec_nsec3_params_t *params, const char *salt_str,
const char *algorithm_str, const char *iterations_str)
{
uint8_t algorithm = 0;
int r = str_to_u8(algorithm_str, &algorithm);
if (r != KNOT_EOK) {
ERR2("invalid algorithm number");
return false;
}
uint16_t iterations = 0;
r = str_to_u16(iterations_str, &iterations);
if (r != KNOT_EOK) {
ERR2("invalid iteration count");
return false;
}
dnssec_binary_t salt = { 0 };
r = str_to_salt(salt_str, &salt);
if (r != DNSSEC_EOK) {
ERR2("invalid salt (%s)", knot_strerror(r));
return false;
}
if (salt.size > UINT8_MAX) {
ERR2("invalid salt, maximum length is %d bytes", UINT8_MAX);
dnssec_binary_free(&salt);
return false;
}
params->algorithm = algorithm;
params->iterations = iterations;
params->salt = salt;
params->flags = 0;
return true;
}
/*!
* \brief Entry point of 'knsec3hash'.
*/
int main(int argc, char *argv[])
{
struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", optional_argument, NULL, 'V' },
{ NULL }
};
int opt = 0;
while ((opt = getopt_long(argc, argv, "hV::", options, NULL)) != -1) {
switch(opt) {
case 'h':
print_help();
return EXIT_SUCCESS;
case 'V':
print_version(PROGRAM_NAME, optarg != NULL);
return EXIT_SUCCESS;
default:
print_help();
return EXIT_FAILURE;
}
}
bool new_params = false;
if (argc == 6) {
// knsec3hash <algorithm> <flags> <iterations> <salt> <domain>
new_params = true;
} else if (argc != 5) {
// knsec3hash <salt> <algorithm> <iterations> <domain>
print_help();
return EXIT_FAILURE;
}
int exit_code = EXIT_FAILURE;
dnssec_nsec3_params_t nsec3_params = { 0 };
dnssec_binary_t dname = { 0 };
dnssec_binary_t digest = { 0 };
dnssec_binary_t digest_print = { 0 };
if (new_params) {
if (!parse_nsec3_params(&nsec3_params, argv[4], argv[1], argv[3])) {
goto fail;
}
} else {
if (!parse_nsec3_params(&nsec3_params, argv[1], argv[2], argv[3])) {
goto fail;
}
}
dname.data = knot_dname_from_str_alloc(argv[new_params ? 5 : 4]);
if (dname.data == NULL) {
ERR2("cannot parse domain name");
goto fail;
}
knot_dname_to_lower(dname.data);
dname.size = knot_dname_size(dname.data);
int r = dnssec_nsec3_hash(&dname, &nsec3_params, &digest);
if (r != DNSSEC_EOK) {
ERR2("cannot compute NSEC3 hash (%s)", knot_strerror(r));
goto fail;
}
r = knot_base32hex_encode_alloc(digest.data, digest.size, &digest_print.data);
if (r < 0) {
ERR2("cannot encode computed hash (%s)", knot_strerror(r));
goto fail;
}
digest_print.size = r;
exit_code = EXIT_SUCCESS;
printf("%.*s (salt=%s, hash=%d, iterations=%d)\n", (int)digest_print.size,
digest_print.data, argv[1], nsec3_params.algorithm,
nsec3_params.iterations);
fail:
dnssec_nsec3_params_free(&nsec3_params);
dnssec_binary_free(&dname);
dnssec_binary_free(&digest);
dnssec_binary_free(&digest_print);
return exit_code;
}
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