nsec3hash.c revision b454c0319685041db3f3e8fd7671e1b364fd20c5
/*
* Copyright (C) 2006, 2008, 2009, 2011 Internet Systems Consortium, Inc. ("ISC")
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: nsec3hash.c,v 1.8 2011/11/02 23:46:24 tbox Exp $ */
#include <config.h>
#include <stdlib.h>
#include <stdarg.h>
#include <isc/base32.h>
#include <isc/buffer.h>
#include <isc/hex.h>
#include <isc/iterated_hash.h>
#include <isc/print.h>
#include <isc/result.h>
#include <isc/string.h>
#include <isc/types.h>
#include <dns/fixedname.h>
#include <dns/name.h>
#include <dns/nsec3.h>
#include <dns/types.h>
const char *program = "nsec3hash";
ISC_PLATFORM_NORETURN_PRE static void
fatal(const char *format, ...) ISC_PLATFORM_NORETURN_POST;
static void
fatal(const char *format, ...) {
va_list args;
fprintf(stderr, "%s: ", program);
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
fprintf(stderr, "\n");
exit(1);
}
static void
check_result(isc_result_t result, const char *message) {
if (result != ISC_R_SUCCESS)
fatal("%s: %s", message, isc_result_totext(result));
}
static void
usage(void) {
fprintf(stderr, "Usage: %s salt algorithm iterations domain\n",
program);
exit(1);
}
int
main(int argc, char **argv) {
dns_fixedname_t fixed;
dns_name_t *name;
isc_buffer_t buffer;
isc_region_t region;
isc_result_t result;
unsigned char hash[NSEC3_MAX_HASH_LENGTH];
unsigned char salt[DNS_NSEC3_SALTSIZE];
unsigned char text[1024];
unsigned int hash_alg;
unsigned int length;
unsigned int iterations;
unsigned int salt_length;
if (argc != 5)
usage();
if (strcmp(argv[1], "-") == 0) {
salt_length = 0;
salt[0] = 0;
} else {
isc_buffer_init(&buffer, salt, sizeof(salt));
result = isc_hex_decodestring(argv[1], &buffer);
check_result(result, "isc_hex_decodestring(salt)");
salt_length = isc_buffer_usedlength(&buffer);
if (salt_length > DNS_NSEC3_SALTSIZE)
fatal("salt too long");
}
hash_alg = atoi(argv[2]);
if (hash_alg > 255U)
fatal("hash algorithm too large");
iterations = atoi(argv[3]);
if (iterations > 0xffffU)
fatal("iterations to large");
dns_fixedname_init(&fixed);
name = dns_fixedname_name(&fixed);
isc_buffer_init(&buffer, argv[4], strlen(argv[4]));
isc_buffer_add(&buffer, strlen(argv[4]));
result = dns_name_fromtext(name, &buffer, dns_rootname, 0, NULL);
check_result(result, "dns_name_fromtext() failed");
dns_name_downcase(name, name, NULL);
length = isc_iterated_hash(hash, hash_alg, iterations, salt,
salt_length, name->ndata, name->length);
if (length == 0)
fatal("isc_iterated_hash failed");
region.base = hash;
region.length = length;
isc_buffer_init(&buffer, text, sizeof(text));
isc_base32hex_totext(&region, 1, "", &buffer);
fprintf(stdout, "%.*s (salt=%s, hash=%u, iterations=%u)\n",
(int)isc_buffer_usedlength(&buffer), text, argv[1], hash_alg, iterations);
return(0);
}