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Merge pull request #586 from teg/resolved-rrs-3

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resolved: minor improvements to RR handling
This commit is contained in:
Daniel Mack 2015-07-14 13:43:18 -04:00
commit 9ecec7d766
4 changed files with 104 additions and 12 deletions
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2
TODO
View File

@ -342,9 +342,7 @@ Features:
- put networkd events and rtnl events at a higher priority, so that
we always process them before we process client requests
- DNSSEC
- use base64 for key presentation?
- add display of private key types (http://tools.ietf.org/html/rfc4034#appendix-A.1.1)?
- add nice formatting of DNS timestamps
- DNS
- search paths
- mDNS/DNS-SD

36
src/resolve/resolved-dns-packet.c
View File

@ -652,6 +652,22 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star
r = dns_packet_append_uint32(p, rr->loc.altitude, NULL);
break;
case DNS_TYPE_DS:
r = dns_packet_append_uint16(p, rr->ds.key_tag, NULL);
if (r < 0)
goto fail;
r = dns_packet_append_uint8(p, rr->ds.algorithm, NULL);
if (r < 0)
goto fail;
r = dns_packet_append_uint8(p, rr->ds.digest_type, NULL);
if (r < 0)
goto fail;
r = dns_packet_append_blob(p, rr->ds.digest, rr->ds.digest_size, NULL);
break;
case DNS_TYPE_SSHFP:
r = dns_packet_append_uint8(p, rr->sshfp.algorithm, NULL);
if (r < 0)
@ -1262,6 +1278,26 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
}
}
case DNS_TYPE_DS:
r = dns_packet_read_uint16(p, &rr->ds.key_tag, NULL);
if (r < 0)
goto fail;
r = dns_packet_read_uint8(p, &rr->ds.algorithm, NULL);
if (r < 0)
goto fail;
r = dns_packet_read_uint8(p, &rr->ds.digest_type, NULL);
if (r < 0)
goto fail;
r = dns_packet_read_public_key(p, rdlength - 4,
&rr->ds.digest, &rr->ds.digest_size,
NULL);
if (r < 0)
goto fail;
break;
case DNS_TYPE_SSHFP:
r = dns_packet_read_uint8(p, &rr->sshfp.algorithm, NULL);
if (r < 0)

70
src/resolve/resolved-dns-rr.c
View File

@ -171,19 +171,19 @@ const struct hash_ops dns_resource_key_hash_ops = {
};
int dns_resource_key_to_string(const DnsResourceKey *key, char **ret) {
char cbuf[DECIMAL_STR_MAX(uint16_t)], tbuf[DECIMAL_STR_MAX(uint16_t)];
char cbuf[strlen("CLASS") + DECIMAL_STR_MAX(uint16_t)], tbuf[strlen("TYPE") + DECIMAL_STR_MAX(uint16_t)];
const char *c, *t;
char *s;
c = dns_class_to_string(key->class);
if (!c) {
sprintf(cbuf, "%i", key->class);
sprintf(cbuf, "CLASS%u", key->class);
c = cbuf;
}
t = dns_type_to_string(key->type);
if (!t){
sprintf(tbuf, "%i", key->type);
sprintf(tbuf, "TYPE%u", key->type);
t = tbuf;
}
@ -271,6 +271,10 @@ DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) {
free(rr->mx.exchange);
break;
case DNS_TYPE_DS:
free(rr->ds.digest);
break;
case DNS_TYPE_SSHFP:
free(rr->sshfp.key);
break;
@ -409,6 +413,13 @@ int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecor
a->loc.longitude == b->loc.longitude &&
a->loc.altitude == b->loc.altitude;
case DNS_TYPE_DS:
return a->ds.key_tag == b->ds.key_tag &&
a->ds.algorithm == b->ds.algorithm &&
a->ds.digest_type == b->ds.digest_type &&
a->ds.digest_size == b->ds.digest_size &&
memcmp(a->ds.digest, b->ds.digest, a->ds.digest_size) == 0;
case DNS_TYPE_SSHFP:
return a->sshfp.algorithm == b->sshfp.algorithm &&
a->sshfp.fptype == b->sshfp.fptype &&
@ -474,6 +485,21 @@ static char* format_location(uint32_t latitude, uint32_t longitude, uint32_t alt
return s;
}
static int format_timestamp_dns(char *buf, size_t l, time_t sec) {
struct tm tm;
assert(buf);
assert(l > strlen("YYYYMMDDHHmmSS"));
if (!gmtime_r(&sec, &tm))
return -EINVAL;
if (strftime(buf, l, "%Y%m%d%H%M%S", &tm) <= 0)
return -EINVAL;
return 0;
}
int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
_cleanup_free_ char *k = NULL, *t = NULL;
char *s;
@ -589,6 +615,21 @@ int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
return -ENOMEM;
break;
case DNS_TYPE_DS:
t = hexmem(rr->ds.digest, rr->ds.digest_size);
if (!t)
return -ENOMEM;
r = asprintf(&s, "%s %u %u %u %s",
k,
rr->ds.key_tag,
rr->ds.algorithm,
rr->ds.digest_type,
t);
if (r < 0)
return -ENOMEM;
break;
case DNS_TYPE_SSHFP:
t = hexmem(rr->sshfp.key, rr->sshfp.key_size);
if (!t)
@ -608,7 +649,7 @@ int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
alg = dnssec_algorithm_to_string(rr->dnskey.algorithm);
t = hexmem(rr->dnskey.key, rr->dnskey.key_size);
t = base64mem(rr->dnskey.key, rr->dnskey.key_size);
if (!t)
return -ENOMEM;
@ -625,18 +666,27 @@ int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
case DNS_TYPE_RRSIG: {
const char *type, *alg;
char expiration[strlen("YYYYMMDDHHmmSS") + 1], inception[strlen("YYYYMMDDHHmmSS") + 1];
type = dns_type_to_string(rr->rrsig.type_covered);
alg = dnssec_algorithm_to_string(rr->rrsig.algorithm);
t = hexmem(rr->rrsig.signature, rr->rrsig.signature_size);
t = base64mem(rr->rrsig.signature, rr->rrsig.signature_size);
if (!t)
return -ENOMEM;
r = format_timestamp_dns(expiration, sizeof(expiration), rr->rrsig.expiration);
if (r < 0)
return r;
r = format_timestamp_dns(inception, sizeof(inception), rr->rrsig.inception);
if (r < 0)
return r;
/* TYPE?? follows
* http://tools.ietf.org/html/rfc3597#section-5 */
r = asprintf(&s, "%s %s%.*u %.*s%.*u %u %u %u %u %u %s %s",
r = asprintf(&s, "%s %s%.*u %.*s%.*u %u %u %s %s %u %s %s",
k,
type ?: "TYPE",
type ? 0 : 1, type ? 0u : (unsigned) rr->rrsig.type_covered,
@ -644,8 +694,8 @@ int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
alg ? 0 : 1, alg ? 0u : (unsigned) rr->rrsig.algorithm,
rr->rrsig.labels,
rr->rrsig.original_ttl,
rr->rrsig.expiration,
rr->rrsig.inception,
expiration,
inception,
rr->rrsig.key_tag,
rr->rrsig.signer,
t);
@ -659,8 +709,8 @@ int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
if (!t)
return -ENOMEM;
s = strjoin(k, " ", t, NULL);
if (!s)
r = asprintf(&s, "%s \\# %"PRIu8" %s", k, rr->generic.size, t);
if (r < 0)
return -ENOMEM;
break;
}

8
src/resolve/resolved-dns-rr.h
View File

@ -108,6 +108,14 @@ struct DnsResourceRecord {
uint32_t altitude;
} loc;
struct {
uint16_t key_tag;
uint8_t algorithm;
uint8_t digest_type;
void *digest;
size_t digest_size;
} ds;
struct {
uint8_t algorithm;
uint8_t fptype;