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authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-08-03 18:17:22 -0400
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-08-03 22:02:32 -0400
commit151226ab4bf276d60d51864330a99f886b923697 (patch)
treeddc7c4861c970fe37f92173054a51b2d309c93f2 /src/resolve
parentff3d6560bead6879a2fed1bf99bfe8273b3723f1 (diff)
resolved: RRSIG records
Diffstat (limited to 'src/resolve')
-rw-r--r--src/resolve/resolved-dns-packet.c129
-rw-r--r--src/resolve/resolved-dns-packet.h6
-rw-r--r--src/resolve/resolved-dns-rr.c51
-rw-r--r--src/resolve/resolved-dns-rr.h14
4 files changed, 174 insertions, 26 deletions
diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
index 626b904d98..b97fd17963 100644
--- a/src/resolve/resolved-dns-packet.c
+++ b/src/resolve/resolved-dns-packet.c
@@ -377,7 +377,8 @@ int dns_packet_append_label(DnsPacket *p, const char *d, size_t l, size_t *start
return 0;
}
-int dns_packet_append_name(DnsPacket *p, const char *name, size_t *start) {
+int dns_packet_append_name(DnsPacket *p, const char *name,
+ bool allow_compression, size_t *start) {
size_t saved_size;
int r;
@@ -389,10 +390,11 @@ int dns_packet_append_name(DnsPacket *p, const char *name, size_t *start) {
while (*name) {
_cleanup_free_ char *s = NULL;
char label[DNS_LABEL_MAX];
- size_t n;
+ size_t n = 0;
int k;
- n = PTR_TO_SIZE(hashmap_get(p->names, name));
+ if (allow_compression)
+ n = PTR_TO_SIZE(hashmap_get(p->names, name));
if (n > 0) {
assert(n < p->size);
@@ -430,15 +432,19 @@ int dns_packet_append_name(DnsPacket *p, const char *name, size_t *start) {
if (r < 0)
goto fail;
- r = hashmap_ensure_allocated(&p->names, dns_name_hash_func, dns_name_compare_func);
- if (r < 0)
- goto fail;
+ if (allow_compression) {
+ r = hashmap_ensure_allocated(&p->names,
+ dns_name_hash_func,
+ dns_name_compare_func);
+ if (r < 0)
+ goto fail;
- r = hashmap_put(p->names, s, SIZE_TO_PTR(n));
- if (r < 0)
- goto fail;
+ r = hashmap_put(p->names, s, SIZE_TO_PTR(n));
+ if (r < 0)
+ goto fail;
- s = NULL;
+ s = NULL;
+ }
}
r = dns_packet_append_uint8(p, 0, NULL);
@@ -465,7 +471,7 @@ int dns_packet_append_key(DnsPacket *p, const DnsResourceKey *k, size_t *start)
saved_size = p->size;
- r = dns_packet_append_name(p, DNS_RESOURCE_KEY_NAME(k), NULL);
+ r = dns_packet_append_name(p, DNS_RESOURCE_KEY_NAME(k), true, NULL);
if (r < 0)
goto fail;
@@ -524,14 +530,14 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star
if (r < 0)
goto fail;
- r = dns_packet_append_name(p, rr->srv.name, NULL);
+ r = dns_packet_append_name(p, rr->srv.name, true, NULL);
break;
case DNS_TYPE_PTR:
case DNS_TYPE_NS:
case DNS_TYPE_CNAME:
case DNS_TYPE_DNAME:
- r = dns_packet_append_name(p, rr->ptr.name, NULL);
+ r = dns_packet_append_name(p, rr->ptr.name, true, NULL);
break;
case DNS_TYPE_HINFO:
@@ -565,11 +571,11 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star
break;
case DNS_TYPE_SOA:
- r = dns_packet_append_name(p, rr->soa.mname, NULL);
+ r = dns_packet_append_name(p, rr->soa.mname, true, NULL);
if (r < 0)
goto fail;
- r = dns_packet_append_name(p, rr->soa.rname, NULL);
+ r = dns_packet_append_name(p, rr->soa.rname, true, NULL);
if (r < 0)
goto fail;
@@ -597,7 +603,7 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star
if (r < 0)
goto fail;
- r = dns_packet_append_name(p, rr->mx.exchange, NULL);
+ r = dns_packet_append_name(p, rr->mx.exchange, true, NULL);
break;
case DNS_TYPE_LOC:
@@ -656,6 +662,42 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star
r = dns_packet_append_blob(p, rr->dnskey.key, rr->dnskey.key_size, NULL);
break;
+ case DNS_TYPE_RRSIG:
+ r = dns_packet_append_uint16(p, rr->rrsig.type_covered, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, rr->rrsig.algorithm, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, rr->rrsig.labels, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->rrsig.original_ttl, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->rrsig.expiration, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint32(p, rr->rrsig.inception, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, rr->rrsig.key_tag, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_name(p, rr->rrsig.signer, false, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_blob(p, rr->rrsig.signature, rr->rrsig.signature_size, NULL);
+ break;
+
case _DNS_TYPE_INVALID: /* unparseable */
default:
@@ -824,7 +866,8 @@ fail:
return r;
}
-int dns_packet_read_name(DnsPacket *p, char **_ret, size_t *start) {
+int dns_packet_read_name(DnsPacket *p, char **_ret,
+ bool allow_compression, size_t *start) {
size_t saved_rindex, after_rindex = 0;
_cleanup_free_ char *ret = NULL;
size_t n = 0, allocated = 0;
@@ -872,7 +915,7 @@ int dns_packet_read_name(DnsPacket *p, char **_ret, size_t *start) {
memcpy(ret + n, t, r);
n += r;
continue;
- } else if ((c & 0xc0) == 0xc0) {
+ } else if (allow_compression && (c & 0xc0) == 0xc0) {
uint16_t ptr;
/* Pointer */
@@ -929,7 +972,7 @@ int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, size_t *start) {
saved_rindex = p->rindex;
- r = dns_packet_read_name(p, &name, NULL);
+ r = dns_packet_read_name(p, &name, true, NULL);
if (r < 0)
goto fail;
@@ -1050,14 +1093,14 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
r = dns_packet_read_uint16(p, &rr->srv.port, NULL);
if (r < 0)
goto fail;
- r = dns_packet_read_name(p, &rr->srv.name, NULL);
+ r = dns_packet_read_name(p, &rr->srv.name, true, NULL);
break;
case DNS_TYPE_PTR:
case DNS_TYPE_NS:
case DNS_TYPE_CNAME:
case DNS_TYPE_DNAME:
- r = dns_packet_read_name(p, &rr->ptr.name, NULL);
+ r = dns_packet_read_name(p, &rr->ptr.name, true, NULL);
break;
case DNS_TYPE_HINFO:
@@ -1095,11 +1138,11 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
break;
case DNS_TYPE_SOA:
- r = dns_packet_read_name(p, &rr->soa.mname, NULL);
+ r = dns_packet_read_name(p, &rr->soa.mname, true, NULL);
if (r < 0)
goto fail;
- r = dns_packet_read_name(p, &rr->soa.rname, NULL);
+ r = dns_packet_read_name(p, &rr->soa.rname, true, NULL);
if (r < 0)
goto fail;
@@ -1127,7 +1170,7 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
if (r < 0)
goto fail;
- r = dns_packet_read_name(p, &rr->mx.exchange, NULL);
+ r = dns_packet_read_name(p, &rr->mx.exchange, true, NULL);
break;
case DNS_TYPE_LOC: {
@@ -1234,6 +1277,44 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
break;
}
+ case DNS_TYPE_RRSIG:
+ r = dns_packet_read_uint16(p, &rr->rrsig.type_covered, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint8(p, &rr->rrsig.algorithm, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint8(p, &rr->rrsig.labels, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint32(p, &rr->rrsig.original_ttl, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint32(p, &rr->rrsig.expiration, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint32(p, &rr->rrsig.inception, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint16(p, &rr->rrsig.key_tag, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_name(p, &rr->rrsig.signer, false, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_public_key(p, offset + rdlength - p->rindex,
+ &rr->rrsig.signature, &rr->rrsig.signature_size,
+ NULL);
+ break;
+
default:
unparseable:
r = dns_packet_read(p, rdlength, &d, NULL);
diff --git a/src/resolve/resolved-dns-packet.h b/src/resolve/resolved-dns-packet.h
index f3b0f0c9eb..26a2e7646a 100644
--- a/src/resolve/resolved-dns-packet.h
+++ b/src/resolve/resolved-dns-packet.h
@@ -142,7 +142,8 @@ int dns_packet_append_uint16(DnsPacket *p, uint16_t v, size_t *start);
int dns_packet_append_uint32(DnsPacket *p, uint32_t v, size_t *start);
int dns_packet_append_string(DnsPacket *p, const char *s, size_t *start);
int dns_packet_append_label(DnsPacket *p, const char *s, size_t l, size_t *start);
-int dns_packet_append_name(DnsPacket *p, const char *name, size_t *start);
+int dns_packet_append_name(DnsPacket *p, const char *name,
+ bool allow_compression, size_t *start);
int dns_packet_append_key(DnsPacket *p, const DnsResourceKey *key, size_t *start);
int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *start);
@@ -152,7 +153,8 @@ int dns_packet_read_uint8(DnsPacket *p, uint8_t *ret, size_t *start);
int dns_packet_read_uint16(DnsPacket *p, uint16_t *ret, size_t *start);
int dns_packet_read_uint32(DnsPacket *p, uint32_t *ret, size_t *start);
int dns_packet_read_string(DnsPacket *p, char **ret, size_t *start);
-int dns_packet_read_name(DnsPacket *p, char **ret, size_t *start);
+int dns_packet_read_name(DnsPacket *p, char **ret,
+ bool allow_compression, size_t *start);
int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, size_t *start);
int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start);
diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c
index bc0cbef92e..c792deda47 100644
--- a/src/resolve/resolved-dns-rr.c
+++ b/src/resolve/resolved-dns-rr.c
@@ -274,6 +274,11 @@ DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) {
free(rr->dnskey.key);
break;
+ case DNS_TYPE_RRSIG:
+ free(rr->rrsig.signer);
+ free(rr->rrsig.signature);
+ break;
+
case DNS_TYPE_LOC:
case DNS_TYPE_A:
case DNS_TYPE_AAAA:
@@ -418,6 +423,21 @@ int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecor
a->dnskey.key_size == b->dnskey.key_size &&
memcmp(a->dnskey.key, b->dnskey.key, a->dnskey.key_size) == 0;
+ case DNS_TYPE_RRSIG:
+ /* do the fast comparisons first */
+ if (a->rrsig.type_covered != a->rrsig.type_covered ||
+ a->rrsig.algorithm != a->rrsig.algorithm ||
+ a->rrsig.labels != a->rrsig.labels ||
+ a->rrsig.original_ttl != a->rrsig.original_ttl ||
+ a->rrsig.expiration != a->rrsig.expiration ||
+ a->rrsig.inception != a->rrsig.inception ||
+ a->rrsig.key_tag != a->rrsig.key_tag ||
+ a->rrsig.signature_size != b->rrsig.signature_size ||
+ memcmp(a->rrsig.signature, b->rrsig.signature, a->rrsig.signature_size) != 0)
+ return false;
+
+ return dns_name_equal(a->rrsig.signer, b->rrsig.signer);
+
default:
return a->generic.size == b->generic.size &&
memcmp(a->generic.data, b->generic.data, a->generic.size) == 0;
@@ -604,6 +624,37 @@ int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
break;
}
+ case DNS_TYPE_RRSIG: {
+ const char *type, *alg;
+
+ 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);
+ if (!t)
+ return -ENOMEM;
+
+ /* 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",
+ k,
+ type ?: "TYPE",
+ type ? 0 : 1, type ? 0u : (unsigned) rr->rrsig.type_covered,
+ alg ? -1 : 0, alg,
+ alg ? 0 : 1, alg ? 0u : (unsigned) rr->rrsig.algorithm,
+ rr->rrsig.labels,
+ rr->rrsig.original_ttl,
+ rr->rrsig.expiration,
+ rr->rrsig.inception,
+ rr->rrsig.key_tag,
+ rr->rrsig.signer,
+ t);
+ if (r < 0)
+ return -ENOMEM;
+ break;
+ }
+
default:
t = hexmem(rr->generic.data, rr->generic.size);
if (!t)
diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h
index e2272643fb..3222f1f0ee 100644
--- a/src/resolve/resolved-dns-rr.h
+++ b/src/resolve/resolved-dns-rr.h
@@ -125,6 +125,20 @@ struct DnsResourceRecord {
void* key;
size_t key_size;
} dnskey;
+
+ /* http://tools.ietf.org/html/rfc4034#section-3.1 */
+ struct {
+ uint16_t type_covered;
+ uint8_t algorithm;
+ uint8_t labels;
+ uint32_t original_ttl;
+ uint32_t expiration;
+ uint32_t inception;
+ uint16_t key_tag;
+ char *signer;
+ void *signature;
+ size_t signature_size;
+ } rrsig;
};
};