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/*
* Part of DNS zone file validator `validns`.
*
* Copyright 2011-2014 Anton Berezin <tobez@tobez.org>
* Modified BSD license.
* (See LICENSE file in the distribution.)
*
*/
#include <sys/types.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "common.h"
#include "textparse.h"
#include "mempool.h"
#include "carp.h"
#include "rr.h"
static struct rr* ds_parse(char *name, long ttl, int type, char *s)
{
struct rr_ds *rr = getmem(sizeof(*rr));
int key_tag, algorithm, digest_type;
key_tag = extract_integer(&s, "key tag", NULL);
if (key_tag < 0) return NULL;
rr->key_tag = key_tag;
algorithm = extract_algorithm(&s, "algorithm");
if (algorithm == ALG_UNSUPPORTED) return NULL;
rr->algorithm = algorithm;
digest_type = extract_integer(&s, "digest type", NULL);
if (digest_type < 0) return NULL;
rr->digest_type = digest_type;
rr->digest = extract_hex_binary_data(&s, "digest", EXTRACT_EAT_WHITESPACE);
if (rr->digest.length < 0) return NULL;
/* See http://www.iana.org/assignments/ds-rr-types/ds-rr-types.xml
* for valid digest types. */
switch (digest_type) {
case 1:
if (rr->digest.length != SHA1_BYTES) {
return bitch("wrong SHA-1 digest length: %d bytes found, %d bytes expected", rr->digest.length, SHA1_BYTES);
}
break;
case 2:
if (rr->digest.length != SHA256_BYTES) {
return bitch("wrong SHA-256 digest length: %d bytes found, %d bytes expected", rr->digest.length, SHA256_BYTES);
}
break;
case 3:
if (rr->digest.length != GOST_BYTES) {
return bitch("wrong GOST R 34.11-94 digest length: %d bytes found, %d bytes expected", rr->digest.length, GOST_BYTES);
}
break;
case 4:
if (rr->digest.length != SHA384_BYTES) {
return bitch("wrong SHA-384 digest length: %d bytes found, %d bytes expected", rr->digest.length, SHA384_BYTES);
}
break;
default:
return bitch("bad or unsupported digest type %d", digest_type);
}
if (*s) {
return bitch("garbage after valid DS data");
}
return store_record(type, name, ttl, rr);
}
static char* ds_human(struct rr *rrv)
{
RRCAST(ds);
char ss[4096];
char *s = ss;
int l;
int i;
l = snprintf(s, 4096, "%u %u %u ", rr->key_tag, rr->algorithm, rr->digest_type);
s += l;
for (i = 0; i < rr->digest.length; i++) {
l = snprintf(s, 4096-(s-ss), "%02X", (unsigned char)rr->digest.data[i]);
s += l;
}
return quickstrdup_temp(ss);
}
static struct binary_data ds_wirerdata(struct rr *rrv)
{
RRCAST(ds);
return compose_binary_data("211d", 1,
rr->key_tag, rr->algorithm, rr->digest_type,
rr->digest);
}
struct rr_methods ds_methods = { ds_parse, ds_human, ds_wirerdata, NULL, NULL };
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