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-rw-r--r--src/resolve/dns-type.c5
-rw-r--r--src/resolve/dns-type.h1
-rw-r--r--src/resolve/resolved-dns-packet.c435
-rw-r--r--src/resolve/resolved-dns-packet.h2
-rw-r--r--src/resolve/resolved-dns-rr.c112
-rw-r--r--src/resolve/resolved-dns-rr.h24
-rw-r--r--src/resolve/resolved-dns-scope.c70
-rw-r--r--src/resolve/resolved-dns-scope.h4
-rw-r--r--src/resolve/resolved-dns-transaction.c192
-rw-r--r--src/resolve/resolved-dns-transaction.h10
-rw-r--r--src/resolve/resolved-manager.c46
-rw-r--r--src/resolve/resolved-manager.h1
12 files changed, 664 insertions, 238 deletions
diff --git a/src/resolve/dns-type.c b/src/resolve/dns-type.c
index a3e740896f..e1087b3219 100644
--- a/src/resolve/dns-type.c
+++ b/src/resolve/dns-type.c
@@ -43,3 +43,8 @@ int dns_type_from_string(const char *s) {
return sc->id;
}
+
+/* XXX: find an authorotative list of all pseudo types? */
+bool dns_type_is_pseudo(int n) {
+ return IN_SET(n, DNS_TYPE_ANY, DNS_TYPE_AXFR, DNS_TYPE_IXFR, DNS_TYPE_OPT);
+}
diff --git a/src/resolve/dns-type.h b/src/resolve/dns-type.h
index 86951d233a..950af36ee3 100644
--- a/src/resolve/dns-type.h
+++ b/src/resolve/dns-type.h
@@ -25,6 +25,7 @@
const char *dns_type_to_string(int type);
int dns_type_from_string(const char *s);
+bool dns_type_is_pseudo(int n);
/* DNS record types, taken from
* http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml.
diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
index 1ebebf8ea4..649e8b74e1 100644
--- a/src/resolve/resolved-dns-packet.c
+++ b/src/resolve/resolved-dns-packet.c
@@ -275,7 +275,7 @@ static void dns_packet_truncate(DnsPacket *p, size_t sz) {
if (p->size <= sz)
return;
- HASHMAP_FOREACH_KEY(s, n, p->names, i) {
+ HASHMAP_FOREACH_KEY(n, s, p->names, i) {
if (PTR_TO_SIZE(n) < sz)
continue;
@@ -502,6 +502,90 @@ fail:
return r;
}
+static int dns_packet_append_type_window(DnsPacket *p, uint8_t window, uint8_t length, uint8_t *types, size_t *start) {
+ size_t saved_size;
+ int r;
+
+ assert(p);
+ assert(types);
+
+ saved_size = p->size;
+
+ if (length != 0) {
+
+ r = dns_packet_append_uint8(p, window, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, length, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_blob(p, types, length, NULL);
+ if (r < 0)
+ goto fail;
+ }
+
+ if (start)
+ *start = saved_size;
+
+ return 0;
+fail:
+ dns_packet_truncate(p, saved_size);
+ return r;
+}
+
+static int dns_packet_append_types(DnsPacket *p, Bitmap *types, size_t *start) {
+ Iterator i;
+ uint8_t window = 0;
+ uint8_t len = 0;
+ uint8_t bitmaps[32] = {};
+ unsigned n;
+ size_t saved_size;
+ int r;
+
+ assert(p);
+ assert(types);
+
+ saved_size = p->size;
+
+ BITMAP_FOREACH(n, types, i) {
+ uint8_t entry;
+
+ assert(n <= 0xffff);
+
+ if ((n << 8) != window) {
+ r = dns_packet_append_type_window(p, window, len, bitmaps, NULL);
+ if (r < 0)
+ goto fail;
+
+ if (len > 0) {
+ len = 0;
+ zero(bitmaps);
+ }
+ }
+
+ window = n << 8;
+ len ++;
+
+ entry = n & 255;
+
+ bitmaps[entry / 8] |= 1 << (7 - (entry % 8));
+ }
+
+ r = dns_packet_append_type_window(p, window, len, bitmaps, NULL);
+ if (r < 0)
+ goto fail;
+
+ if (start)
+ *start = saved_size;
+
+ return 0;
+fail:
+ dns_packet_truncate(p, saved_size);
+ return r;
+}
+
int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *start) {
size_t saved_size, rdlength_offset, end, rdlength;
int r;
@@ -677,7 +761,7 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star
if (r < 0)
goto fail;
- r = dns_packet_append_blob(p, rr->sshfp.key, rr->sshfp.key_size, NULL);
+ r = dns_packet_append_blob(p, rr->sshfp.fingerprint, rr->sshfp.fingerprint_size, NULL);
break;
case DNS_TYPE_DNSKEY:
@@ -732,6 +816,50 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star
r = dns_packet_append_blob(p, rr->rrsig.signature, rr->rrsig.signature_size, NULL);
break;
+ case DNS_TYPE_NSEC:
+ r = dns_packet_append_name(p, rr->nsec.next_domain_name, false, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_types(p, rr->nsec.types, NULL);
+ if (r < 0)
+ goto fail;
+
+ break;
+ case DNS_TYPE_NSEC3:
+ r = dns_packet_append_uint8(p, rr->nsec3.algorithm, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, rr->nsec3.flags, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint16(p, rr->nsec3.iterations, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, rr->nsec3.salt_size, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_blob(p, rr->nsec3.salt, rr->nsec3.salt_size, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_uint8(p, rr->nsec3.next_hashed_name_size, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_blob(p, rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_append_types(p, rr->nsec3.types, NULL);
+ if (r < 0)
+ goto fail;
+
+ break;
case _DNS_TYPE_INVALID: /* unparseable */
default:
@@ -805,6 +933,42 @@ int dns_packet_read_blob(DnsPacket *p, void *d, size_t sz, size_t *start) {
return 0;
}
+static int dns_packet_read_memdup(
+ DnsPacket *p, size_t size,
+ void **ret, size_t *ret_size,
+ size_t *ret_start) {
+
+ const void *src;
+ size_t start;
+ int r;
+
+ assert(p);
+ assert(ret);
+
+ r = dns_packet_read(p, size, &src, &start);
+ if (r < 0)
+ return r;
+
+ if (size <= 0)
+ *ret = NULL;
+ else {
+ void *copy;
+
+ copy = memdup(src, size);
+ if (!copy)
+ return -ENOMEM;
+
+ *ret = copy;
+ }
+
+ if (ret_size)
+ *ret_size = size;
+ if (ret_start)
+ *ret_start = start;
+
+ return 0;
+}
+
int dns_packet_read_uint8(DnsPacket *p, uint8_t *ret, size_t *start) {
const void *d;
int r;
@@ -996,6 +1160,114 @@ fail:
return r;
}
+static int dns_packet_read_type_window(DnsPacket *p, Bitmap **types, size_t *start) {
+ uint8_t window;
+ uint8_t length;
+ const uint8_t *bitmap;
+ unsigned i;
+ bool found = false;
+ size_t saved_rindex;
+ int r;
+
+ assert(p);
+ assert(types);
+
+ saved_rindex = p->rindex;
+
+ r = bitmap_ensure_allocated(types);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint8(p, &window, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint8(p, &length, NULL);
+ if (r < 0)
+ goto fail;
+
+ if (length == 0 || length > 32)
+ return -EBADMSG;
+
+ r = dns_packet_read(p, length, (const void **)&bitmap, NULL);
+ if (r < 0)
+ goto fail;
+
+ for (i = 0; i < length; i++) {
+ uint8_t bitmask = 1 << 7;
+ uint8_t bit = 0;
+
+ if (!bitmap[i]) {
+ found = false;
+ continue;
+ }
+
+ found = true;
+
+ while (bitmask) {
+ if (bitmap[i] & bitmask) {
+ uint16_t n;
+
+ n = (uint16_t) window << 8 | (uint16_t) bit;
+
+ /* Ignore pseudo-types. see RFC4034 section 4.1.2 */
+ if (dns_type_is_pseudo(n))
+ continue;
+
+ r = bitmap_set(*types, n);
+ if (r < 0)
+ goto fail;
+ }
+
+ bit ++;
+ bitmask >>= 1;
+ }
+ }
+
+ if (!found)
+ return -EBADMSG;
+
+ if (start)
+ *start = saved_rindex;
+
+ return 0;
+fail:
+ dns_packet_rewind(p, saved_rindex);
+ return r;
+}
+
+static int dns_packet_read_type_windows(DnsPacket *p, Bitmap **types, size_t size, size_t *start) {
+ size_t saved_rindex;
+ int r;
+
+ saved_rindex = p->rindex;
+
+ while (p->rindex < saved_rindex + size) {
+ r = dns_packet_read_type_window(p, types, NULL);
+ if (r < 0)
+ goto fail;
+
+ /* don't read past end of current RR */
+ if (p->rindex > saved_rindex + size) {
+ r = -EBADMSG;
+ goto fail;
+ }
+ }
+
+ if (p->rindex != saved_rindex + size) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ if (start)
+ *start = saved_rindex;
+
+ return 0;
+fail:
+ dns_packet_rewind(p, saved_rindex);
+ return r;
+}
+
int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, size_t *start) {
_cleanup_free_ char *name = NULL;
uint16_t class, type;
@@ -1038,26 +1310,6 @@ fail:
return r;
}
-static int dns_packet_read_public_key(DnsPacket *p, size_t length,
- void **dp, size_t *lengthp,
- size_t *start) {
- int r;
- const void *d;
- void *d2;
-
- r = dns_packet_read(p, length, &d, NULL);
- if (r < 0)
- return r;
-
- d2 = memdup(d, length);
- if (!d2)
- return -ENOMEM;
-
- *dp = d2;
- *lengthp = length;
- return 0;
-}
-
static bool loc_size_ok(uint8_t size) {
uint8_t m = size >> 4, e = size & 0xF;
@@ -1080,7 +1332,6 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
size_t saved_rindex, offset;
uint16_t rdlength;
- const void *d;
int r;
assert(p);
@@ -1291,12 +1542,19 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
if (r < 0)
goto fail;
- r = dns_packet_read_public_key(p, rdlength - 4,
- &rr->ds.digest, &rr->ds.digest_size,
- NULL);
+ r = dns_packet_read_memdup(p, rdlength - 4,
+ &rr->ds.digest, &rr->ds.digest_size,
+ NULL);
if (r < 0)
goto fail;
+ if (rr->ds.digest_size <= 0) {
+ /* the accepted size depends on the algorithm, but for now
+ just ensure that the value is greater than zero */
+ r = -EBADMSG;
+ goto fail;
+ }
+
break;
case DNS_TYPE_SSHFP:
r = dns_packet_read_uint8(p, &rr->sshfp.algorithm, NULL);
@@ -1307,9 +1565,17 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
if (r < 0)
goto fail;
- r = dns_packet_read_public_key(p, rdlength - 2,
- &rr->sshfp.key, &rr->sshfp.key_size,
- NULL);
+ r = dns_packet_read_memdup(p, rdlength - 2,
+ &rr->sshfp.fingerprint, &rr->sshfp.fingerprint_size,
+ NULL);
+
+ if (rr->sshfp.fingerprint_size <= 0) {
+ /* the accepted size depends on the algorithm, but for now
+ just ensure that the value is greater than zero */
+ r = -EBADMSG;
+ goto fail;
+ }
+
break;
case DNS_TYPE_DNSKEY: {
@@ -1338,9 +1604,17 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
if (r < 0)
goto fail;
- r = dns_packet_read_public_key(p, rdlength - 4,
- &rr->dnskey.key, &rr->dnskey.key_size,
- NULL);
+ r = dns_packet_read_memdup(p, rdlength - 4,
+ &rr->dnskey.key, &rr->dnskey.key_size,
+ NULL);
+
+ if (rr->dnskey.key_size <= 0) {
+ /* the accepted size depends on the algorithm, but for now
+ just ensure that the value is greater than zero */
+ r = -EBADMSG;
+ goto fail;
+ }
+
break;
}
@@ -1377,24 +1651,83 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
if (r < 0)
goto fail;
- r = dns_packet_read_public_key(p, offset + rdlength - p->rindex,
- &rr->rrsig.signature, &rr->rrsig.signature_size,
- NULL);
+ r = dns_packet_read_memdup(p, offset + rdlength - p->rindex,
+ &rr->rrsig.signature, &rr->rrsig.signature_size,
+ NULL);
+
+ if (rr->rrsig.signature_size <= 0) {
+ /* the accepted size depends on the algorithm, but for now
+ just ensure that the value is greater than zero */
+ r = -EBADMSG;
+ goto fail;
+ }
+
break;
- default:
- unparseable:
- r = dns_packet_read(p, rdlength, &d, NULL);
+ case DNS_TYPE_NSEC:
+ r = dns_packet_read_name(p, &rr->nsec.next_domain_name, false, NULL);
if (r < 0)
goto fail;
- rr->generic.data = memdup(d, rdlength);
- if (!rr->generic.data) {
- r = -ENOMEM;
+ r = dns_packet_read_type_windows(p, &rr->nsec.types, offset + rdlength - p->rindex, NULL);
+ if (r < 0)
+ goto fail;
+
+ /* NSEC RRs with empty bitmpas makes no sense, but the RFC does not explicitly forbid them
+ so we allow it */
+
+ break;
+
+ case DNS_TYPE_NSEC3: {
+ uint8_t size;
+
+ r = dns_packet_read_uint8(p, &rr->nsec3.algorithm, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint8(p, &rr->nsec3.flags, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint16(p, &rr->nsec3.iterations, NULL);
+ if (r < 0)
+ goto fail;
+
+ /* this may be zero */
+ r = dns_packet_read_uint8(p, &size, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_memdup(p, size, &rr->nsec3.salt, &rr->nsec3.salt_size, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_uint8(p, &size, NULL);
+ if (r < 0)
+ goto fail;
+
+ if (size <= 0) {
+ r = -EBADMSG;
goto fail;
}
- rr->generic.size = rdlength;
+ r = dns_packet_read_memdup(p, size, &rr->nsec3.next_hashed_name, &rr->nsec3.next_hashed_name_size, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = dns_packet_read_type_windows(p, &rr->nsec.types, offset + rdlength - p->rindex, NULL);
+ if (r < 0)
+ goto fail;
+
+ /* empty non-terminals can have NSEC3 records, so empty bitmaps are allowed */
+
+ break;
+ }
+ default:
+ unparseable:
+ r = dns_packet_read_memdup(p, rdlength, &rr->generic.data, &rr->generic.size, NULL);
+ if (r < 0)
+ goto fail;
break;
}
if (r < 0)
@@ -1516,13 +1849,15 @@ static const char* const dns_protocol_table[_DNS_PROTOCOL_MAX] = {
DEFINE_STRING_TABLE_LOOKUP(dns_protocol, DnsProtocol);
static const char* const dnssec_algorithm_table[_DNSSEC_ALGORITHM_MAX_DEFINED] = {
- [DNSSEC_ALGORITHM_RSAMD5] = "RSAMD5",
- [DNSSEC_ALGORITHM_DH] = "DH",
- [DNSSEC_ALGORITHM_DSA] = "DSA",
- [DNSSEC_ALGORITHM_ECC] = "ECC",
- [DNSSEC_ALGORITHM_RSASHA1] = "RSASHA1",
- [DNSSEC_ALGORITHM_INDIRECT] = "INDIRECT",
- [DNSSEC_ALGORITHM_PRIVATEDNS] = "PRIVATEDNS",
- [DNSSEC_ALGORITHM_PRIVATEOID] = "PRIVATEOID",
+ [DNSSEC_ALGORITHM_RSAMD5] = "RSAMD5",
+ [DNSSEC_ALGORITHM_DH] = "DH",
+ [DNSSEC_ALGORITHM_DSA] = "DSA",
+ [DNSSEC_ALGORITHM_ECC] = "ECC",
+ [DNSSEC_ALGORITHM_RSASHA1] = "RSASHA1",
+ [DNSSEC_ALGORITHM_DSA_NSEC3_SHA1] = "DSA-NSEC3-SHA1",
+ [DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1] = "RSASHA1-NSEC3-SHA1",
+ [DNSSEC_ALGORITHM_INDIRECT] = "INDIRECT",
+ [DNSSEC_ALGORITHM_PRIVATEDNS] = "PRIVATEDNS",
+ [DNSSEC_ALGORITHM_PRIVATEOID] = "PRIVATEOID",
};
DEFINE_STRING_TABLE_LOOKUP(dnssec_algorithm, int);
diff --git a/src/resolve/resolved-dns-packet.h b/src/resolve/resolved-dns-packet.h
index 6588ed9df5..58559c85df 100644
--- a/src/resolve/resolved-dns-packet.h
+++ b/src/resolve/resolved-dns-packet.h
@@ -223,6 +223,8 @@ enum {
DNSSEC_ALGORITHM_DSA,
DNSSEC_ALGORITHM_ECC,
DNSSEC_ALGORITHM_RSASHA1,
+ DNSSEC_ALGORITHM_DSA_NSEC3_SHA1,
+ DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1,
DNSSEC_ALGORITHM_INDIRECT = 252,
DNSSEC_ALGORITHM_PRIVATEDNS,
DNSSEC_ALGORITHM_PRIVATEOID,
diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c
index 676b77713e..ad7ca26cfe 100644
--- a/src/resolve/resolved-dns-rr.c
+++ b/src/resolve/resolved-dns-rr.c
@@ -276,7 +276,7 @@ DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) {
break;
case DNS_TYPE_SSHFP:
- free(rr->sshfp.key);
+ free(rr->sshfp.fingerprint);
break;
case DNS_TYPE_DNSKEY:
@@ -288,6 +288,17 @@ DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) {
free(rr->rrsig.signature);
break;
+ case DNS_TYPE_NSEC:
+ free(rr->nsec.next_domain_name);
+ bitmap_free(rr->nsec.types);
+ break;
+
+ case DNS_TYPE_NSEC3:
+ free(rr->nsec3.next_hashed_name);
+ free(rr->nsec3.salt);
+ bitmap_free(rr->nsec3.types);
+ break;
+
case DNS_TYPE_LOC:
case DNS_TYPE_A:
case DNS_TYPE_AAAA:
@@ -423,8 +434,8 @@ int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecor
case DNS_TYPE_SSHFP:
return a->sshfp.algorithm == b->sshfp.algorithm &&
a->sshfp.fptype == b->sshfp.fptype &&
- a->sshfp.key_size == b->sshfp.key_size &&
- memcmp(a->sshfp.key, b->sshfp.key, a->sshfp.key_size) == 0;
+ a->sshfp.fingerprint_size == b->sshfp.fingerprint_size &&
+ memcmp(a->sshfp.fingerprint, b->sshfp.fingerprint, a->sshfp.fingerprint_size) == 0;
case DNS_TYPE_DNSKEY:
return a->dnskey.zone_key_flag == b->dnskey.zone_key_flag &&
@@ -448,6 +459,19 @@ int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecor
return dns_name_equal(a->rrsig.signer, b->rrsig.signer);
+ case DNS_TYPE_NSEC:
+ return dns_name_equal(a->nsec.next_domain_name, b->nsec.next_domain_name) &&
+ bitmap_equal(a->nsec.types, b->nsec.types);
+
+ case DNS_TYPE_NSEC3:
+ return a->nsec3.algorithm == b->nsec3.algorithm &&
+ a->nsec3.flags == b->nsec3.flags &&
+ a->nsec3.iterations == b->nsec3.iterations &&
+ a->nsec3.salt_size == b->nsec3.salt_size &&
+ memcmp(a->nsec3.salt, b->nsec3.salt, a->nsec3.salt_size) == 0 &&
+ memcmp(a->nsec3.next_hashed_name, b->nsec3.next_hashed_name, a->nsec3.next_hashed_name_size) == 0 &&
+ bitmap_equal(a->nsec3.types, b->nsec3.types);
+
default:
return a->generic.size == b->generic.size &&
memcmp(a->generic.data, b->generic.data, a->generic.size) == 0;
@@ -500,6 +524,38 @@ static int format_timestamp_dns(char *buf, size_t l, time_t sec) {
return 0;
}
+static char *format_types(Bitmap *types) {
+ _cleanup_strv_free_ char **strv = NULL;
+ _cleanup_free_ char *str = NULL;
+ Iterator i;
+ unsigned type;
+ int r;
+
+ BITMAP_FOREACH(type, types, i) {
+ if (dns_type_to_string(type)) {
+ r = strv_extend(&strv, dns_type_to_string(type));
+ if (r < 0)
+ return NULL;
+ } else {
+ char *t;
+
+ r = asprintf(&t, "TYPE%u", type);
+ if (r < 0)
+ return NULL;
+
+ r = strv_consume(&strv, t);
+ if (r < 0)
+ return NULL;
+ }
+ }
+
+ str = strv_join(strv, " ");
+ if (!str)
+ return NULL;
+
+ return strjoin("( ", str, " )", NULL);
+}
+
int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
_cleanup_free_ char *k = NULL, *t = NULL;
char *s;
@@ -631,7 +687,7 @@ int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
break;
case DNS_TYPE_SSHFP:
- t = hexmem(rr->sshfp.key, rr->sshfp.key_size);
+ t = hexmem(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size);
if (!t)
return -ENOMEM;
@@ -704,12 +760,56 @@ int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
break;
}
+ case DNS_TYPE_NSEC:
+ t = format_types(rr->nsec.types);
+ if (!t)
+ return -ENOMEM;
+
+ r = asprintf(&s, "%s %s %s",
+ k,
+ rr->nsec.next_domain_name,
+ t);
+ if (r < 0)
+ return -ENOMEM;
+ break;
+
+ case DNS_TYPE_NSEC3: {
+ _cleanup_free_ char *salt = NULL, *hash = NULL;
+
+ if (rr->nsec3.salt_size > 0) {
+ salt = hexmem(rr->nsec3.salt, rr->nsec3.salt_size);
+ if (!salt)
+ return -ENOMEM;
+ }
+
+ hash = base32hexmem(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, false);
+ if (!hash)
+ return -ENOMEM;
+
+ t = format_types(rr->nsec3.types);
+ if (!t)
+ return -ENOMEM;
+
+ r = asprintf(&s, "%s %"PRIu8" %"PRIu8" %"PRIu16" %s %s %s",
+ k,
+ rr->nsec3.algorithm,
+ rr->nsec3.flags,
+ rr->nsec3.iterations,
+ rr->nsec3.salt_size > 0 ? salt : "-",
+ hash,
+ t);
+ if (r < 0)
+ return -ENOMEM;
+
+ break;
+ }
+
default:
t = hexmem(rr->generic.data, rr->generic.size);
if (!t)
return -ENOMEM;
- r = asprintf(&s, "%s \\# %"PRIu8" %s", k, rr->generic.size, t);
+ r = asprintf(&s, "%s \\# %zu %s", k, rr->generic.size, t);
if (r < 0)
return -ENOMEM;
break;
@@ -740,7 +840,7 @@ int dns_class_from_string(const char *s, uint16_t *class) {
if (strcaseeq(s, "IN"))
*class = DNS_CLASS_IN;
else if (strcaseeq(s, "ANY"))
- *class = DNS_TYPE_ANY;
+ *class = DNS_CLASS_ANY;
else
return -EINVAL;
diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h
index b375d6b9fc..0f40f3ceef 100644
--- a/src/resolve/resolved-dns-rr.h
+++ b/src/resolve/resolved-dns-rr.h
@@ -23,6 +23,7 @@
#include <netinet/in.h>
+#include "bitmap.h"
#include "hashmap.h"
#include "in-addr-util.h"
#include "dns-type.h"
@@ -52,7 +53,7 @@ struct DnsResourceRecord {
union {
struct {
void *data;
- uint16_t size;
+ size_t size;
} generic;
struct {
@@ -116,11 +117,12 @@ struct DnsResourceRecord {
size_t digest_size;
} ds;
+ /* https://tools.ietf.org/html/rfc4255#section-3.1 */
struct {
uint8_t algorithm;
uint8_t fptype;
- void *key;
- size_t key_size;
+ void *fingerprint;
+ size_t fingerprint_size;
} sshfp;
/* http://tools.ietf.org/html/rfc4034#section-2.1 */
@@ -145,6 +147,22 @@ struct DnsResourceRecord {
void *signature;
size_t signature_size;
} rrsig;
+
+ struct {
+ char *next_domain_name;
+ Bitmap *types;
+ } nsec;
+
+ struct {
+ uint8_t algorithm;
+ uint8_t flags;
+ uint16_t iterations;
+ void *salt;
+ size_t salt_size;
+ void *next_hashed_name;
+ size_t next_hashed_name_size;
+ Bitmap *types;
+ } nsec3;
};
};
diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c
index 7b72c090c2..927a1ddc26 100644
--- a/src/resolve/resolved-dns-scope.c
+++ b/src/resolve/resolved-dns-scope.c
@@ -125,18 +125,17 @@ void dns_scope_next_dns_server(DnsScope *s) {
manager_next_dns_server(s->manager);
}
-int dns_scope_emit(DnsScope *s, DnsTransaction *t, DnsPacket *p, DnsServer **server) {
- DnsServer *srv = NULL;
+int dns_scope_emit(DnsScope *s, int fd, DnsPacket *p) {
union in_addr_union addr;
int ifindex = 0, r;
int family;
uint16_t port;
uint32_t mtu;
- int fd;
assert(s);
assert(p);
assert(p->protocol == s->protocol);
+ assert((s->protocol == DNS_PROTOCOL_DNS) != (fd < 0));
if (s->link) {
mtu = s->link->mtu;
@@ -148,28 +147,15 @@ int dns_scope_emit(DnsScope *s, DnsTransaction *t, DnsPacket *p, DnsServer **ser
if (DNS_PACKET_QDCOUNT(p) > 1)
return -EOPNOTSUPP;
- srv = dns_scope_get_dns_server(s);
- if (!srv)
- return -ESRCH;
-
- family = srv->family;
- addr = srv->address;
- port = 53;
-
if (p->size > DNS_PACKET_UNICAST_SIZE_MAX)
return -EMSGSIZE;
if (p->size + UDP_PACKET_HEADER_SIZE > mtu)
return -EMSGSIZE;
- if (family == AF_INET)
- fd = transaction_dns_ipv4_fd(t);
- else if (family == AF_INET6)
- fd = transaction_dns_ipv6_fd(t);
- else
- return -EAFNOSUPPORT;
- if (fd < 0)
- return fd;
+ r = manager_write(s->manager, fd, p);
+ if (r < 0)
+ return r;
} else if (s->protocol == DNS_PROTOCOL_LLMNR) {
@@ -192,20 +178,17 @@ int dns_scope_emit(DnsScope *s, DnsTransaction *t, DnsPacket *p, DnsServer **ser
return -EAFNOSUPPORT;
if (fd < 0)
return fd;
+
+ r = manager_send(s->manager, fd, ifindex, family, &addr, port, p);
+ if (r < 0)
+ return r;
} else
return -EAFNOSUPPORT;
- r = manager_send(s->manager, fd, ifindex, family, &addr, port, p);
- if (r < 0)
- return r;
-
- if (server)
- *server = srv;
-
return 1;
}
-int dns_scope_tcp_socket(DnsScope *s, int family, const union in_addr_union *address, uint16_t port, DnsServer **server) {
+static int dns_scope_socket(DnsScope *s, int type, int family, const union in_addr_union *address, uint16_t port, DnsServer **server) {
DnsServer *srv = NULL;
_cleanup_close_ int fd = -1;
union sockaddr_union sa = {};
@@ -249,13 +232,15 @@ int dns_scope_tcp_socket(DnsScope *s, int family, const union in_addr_union *add
return -EAFNOSUPPORT;
}
- fd = socket(sa.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+ fd = socket(sa.sa.sa_family, type|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (fd < 0)
return -errno;
- r = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
- if (r < 0)
- return -errno;
+ if (type == SOCK_STREAM) {
+ r = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
+ if (r < 0)
+ return -errno;
+ }
if (s->link) {
uint32_t ifindex = htobe32(s->link->ifindex);
@@ -298,6 +283,14 @@ int dns_scope_tcp_socket(DnsScope *s, int family, const union in_addr_union *add
return ret;
}
+int dns_scope_udp_dns_socket(DnsScope *s, DnsServer **server) {
+ return dns_scope_socket(s, SOCK_DGRAM, AF_UNSPEC, NULL, 53, server);
+}
+
+int dns_scope_tcp_socket(DnsScope *s, int family, const union in_addr_union *address, uint16_t port, DnsServer **server) {
+ return dns_scope_socket(s, SOCK_STREAM, family, address, port, server);
+}
+
DnsScopeMatch dns_scope_good_domain(DnsScope *s, int ifindex, uint64_t flags, const char *domain) {
char **i;
@@ -420,19 +413,6 @@ int dns_scope_llmnr_membership(DnsScope *s, bool b) {
return 0;
}
-int dns_scope_good_dns_server(DnsScope *s, int family, const union in_addr_union *address) {
- assert(s);
- assert(address);
-
- if (s->protocol != DNS_PROTOCOL_DNS)
- return 1;
-
- if (s->link)
- return !!link_find_dns_server(s->link, family, address);
- else
- return !!manager_find_dns_server(s->manager, family, address);
-}
-
static int dns_scope_make_reply_packet(
DnsScope *s,
uint16_t id,
@@ -700,7 +680,7 @@ static int on_conflict_dispatch(sd_event_source *es, usec_t usec, void *userdata
return 0;
}
- r = dns_scope_emit(scope, NULL, p, NULL);
+ r = dns_scope_emit(scope, -1, p);
if (r < 0)
log_debug_errno(r, "Failed to send conflict packet: %m");
}
diff --git a/src/resolve/resolved-dns-scope.h b/src/resolve/resolved-dns-scope.h
index 5c5ccc71c5..29479ad550 100644
--- a/src/resolve/resolved-dns-scope.h
+++ b/src/resolve/resolved-dns-scope.h
@@ -65,12 +65,12 @@ struct DnsScope {
int dns_scope_new(Manager *m, DnsScope **ret, Link *l, DnsProtocol p, int family);
DnsScope* dns_scope_free(DnsScope *s);
-int dns_scope_emit(DnsScope *s, DnsTransaction *t, DnsPacket *p, DnsServer **server);
+int dns_scope_emit(DnsScope *s, int fd, DnsPacket *p);
int dns_scope_tcp_socket(DnsScope *s, int family, const union in_addr_union *address, uint16_t port, DnsServer **server);
+int dns_scope_udp_dns_socket(DnsScope *s, DnsServer **server);
DnsScopeMatch dns_scope_good_domain(DnsScope *s, int ifindex, uint64_t flags, const char *domain);
int dns_scope_good_key(DnsScope *s, DnsResourceKey *key);
-int dns_scope_good_dns_server(DnsScope *s, int family, const union in_addr_union *address);
DnsServer *dns_scope_get_dns_server(DnsScope *s);
void dns_scope_next_dns_server(DnsScope *s);
diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c
index e468f245f7..b235fda3d2 100644
--- a/src/resolve/resolved-dns-transaction.c
+++ b/src/resolve/resolved-dns-transaction.c
@@ -39,10 +39,8 @@ DnsTransaction* dns_transaction_free(DnsTransaction *t) {
dns_packet_unref(t->received);
dns_answer_unref(t->cached);
- sd_event_source_unref(t->dns_ipv4_event_source);
- sd_event_source_unref(t->dns_ipv6_event_source);
- safe_close(t->dns_ipv4_fd);
- safe_close(t->dns_ipv6_fd);
+ sd_event_source_unref(t->dns_event_source);
+ safe_close(t->dns_fd);
dns_server_unref(t->server);
dns_stream_free(t->stream);
@@ -94,7 +92,7 @@ int dns_transaction_new(DnsTransaction **ret, DnsScope *s, DnsQuestion *q) {
if (!t)
return -ENOMEM;
- t->dns_ipv4_fd = t->dns_ipv6_fd = -1;
+ t->dns_fd = -1;
t->question = dns_question_ref(q);
@@ -245,7 +243,7 @@ static int on_stream_complete(DnsStream *s, int error) {
}
static int dns_transaction_open_tcp(DnsTransaction *t) {
- _cleanup_(dns_server_unrefp) DnsServer *server = NULL;
+ DnsServer *server = NULL;
_cleanup_close_ int fd = -1;
int r;
@@ -310,6 +308,16 @@ static int dns_transaction_open_tcp(DnsTransaction *t) {
return 0;
}
+static void dns_transaction_next_dns_server(DnsTransaction *t) {
+ assert(t);
+
+ t->server = dns_server_unref(t->server);
+ t->dns_event_source = sd_event_source_unref(t->dns_event_source);
+ t->dns_fd = safe_close(t->dns_fd);
+
+ dns_scope_next_dns_server(t->scope);
+}
+
void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
int r;
@@ -342,24 +350,6 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
}
}
- if (t->scope->protocol == DNS_PROTOCOL_DNS) {
-
- /* For DNS we are fine with accepting packets on any
- * interface, but the source IP address must be the
- * one of the DNS server we queried */
-
- assert(t->server);
-
- if (t->server->family != p->family)
- return;
-
- if (!in_addr_equal(p->family, &p->sender, &t->server->address))
- return;
-
- if (p->sender_port != 53)
- return;
- }
-
if (t->received != p) {
dns_packet_unref(t->received);
t->received = dns_packet_ref(p);
@@ -396,7 +386,7 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
}
/* On DNS, couldn't send? Try immediately again, with a new server */
- dns_scope_next_dns_server(t->scope);
+ dns_transaction_next_dns_server(t);
r = dns_transaction_go(t);
if (r < 0) {
@@ -417,8 +407,10 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
/* Only consider responses with equivalent query section to the request */
if (!dns_question_is_superset(p->question, t->question) ||
- !dns_question_is_superset(t->question, p->question))
+ !dns_question_is_superset(t->question, p->question)) {
dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY);
+ return;
+ }
/* According to RFC 4795, section 2.9. only the RRs from the answer section shall be cached */
dns_cache_put(&t->scope->cache, p->question, DNS_PACKET_RCODE(p), p->answer, DNS_PACKET_ANCOUNT(p), 0, p->family, &p->sender);
@@ -429,6 +421,56 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
dns_transaction_complete(t, DNS_TRANSACTION_FAILURE);
}
+static int on_dns_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
+ DnsTransaction *t = userdata;
+ int r;
+
+ assert(t);
+ assert(t->scope);
+
+ r = manager_recv(t->scope->manager, fd, DNS_PROTOCOL_DNS, &p);
+ if (r <= 0)
+ return r;
+
+ if (dns_packet_validate_reply(p) > 0 &&
+ DNS_PACKET_ID(p) == t->id) {
+ dns_transaction_process_reply(t, p);
+ } else
+ log_debug("Invalid DNS packet.");
+
+ return 0;
+}
+
+static int dns_transaction_emit(DnsTransaction *t) {
+ int r;
+
+ assert(t);
+
+ if (t->scope->protocol == DNS_PROTOCOL_DNS && !t->server) {
+ DnsServer *server = NULL;
+ _cleanup_close_ int fd = -1;
+
+ fd = dns_scope_udp_dns_socket(t->scope, &server);
+ if (fd < 0)
+ return fd;
+
+ r = sd_event_add_io(t->scope->manager->event, &t->dns_event_source, fd, EPOLLIN, on_dns_packet, t);
+ if (r < 0)
+ return r;
+
+ t->dns_fd = fd;
+ fd = -1;
+ t->server = dns_server_ref(server);
+ }
+
+ r = dns_scope_emit(t->scope, t->dns_fd, t->sent);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
static int on_transaction_timeout(sd_event_source *s, usec_t usec, void *userdata) {
DnsTransaction *t = userdata;
int r;
@@ -437,7 +479,7 @@ static int on_transaction_timeout(sd_event_source *s, usec_t usec, void *userdat
assert(t);
/* Timeout reached? Try again, with a new server */
- dns_scope_next_dns_server(t->scope);
+ dns_transaction_next_dns_server(t);
r = dns_transaction_go(t);
if (r < 0)
@@ -514,7 +556,6 @@ int dns_transaction_go(DnsTransaction *t) {
}
t->n_attempts++;
- t->server = dns_server_unref(t->server);
t->received = dns_packet_unref(t->received);
t->cached = dns_answer_unref(t->cached);
t->cached_rcode = 0;
@@ -594,13 +635,9 @@ int dns_transaction_go(DnsTransaction *t) {
* always be made via TCP on LLMNR */
r = dns_transaction_open_tcp(t);
} else {
- DnsServer *server;
-
/* Try via UDP, and if that fails due to large size try via TCP */
- r = dns_scope_emit(t->scope, t, t->sent, &server);
- if (r >= 0)
- t->server = dns_server_ref(server);
- else if (r == -EMSGSIZE)
+ r = dns_transaction_emit(t);
+ if (r == -EMSGSIZE)
r = dns_transaction_open_tcp(t);
}
if (r == -ESRCH) {
@@ -614,7 +651,7 @@ int dns_transaction_go(DnsTransaction *t) {
}
/* Couldn't send? Try immediately again, with a new server */
- dns_scope_next_dns_server(t->scope);
+ dns_transaction_next_dns_server(t);
return dns_transaction_go(t);
}
@@ -632,91 +669,6 @@ int dns_transaction_go(DnsTransaction *t) {
return 1;
}
-static int on_dns_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
- _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
- DnsTransaction *t = userdata;
- int r;
-
- assert(t);
- assert(t->scope);
-
- r = manager_recv(t->scope->manager, fd, DNS_PROTOCOL_DNS, &p);
- if (r <= 0)
- return r;
-
- if (dns_packet_validate_reply(p) > 0 &&
- DNS_PACKET_ID(p) == t->id) {
- dns_transaction_process_reply(t, p);
- } else
- log_debug("Invalid DNS packet.");
-
- return 0;
-}
-
-int transaction_dns_ipv4_fd(DnsTransaction *t) {
- const int one = 1;
- int r;
-
- assert(t);
- assert(t->scope);
- assert(t->scope->manager);
-
- if (t->dns_ipv4_fd >= 0)
- return t->dns_ipv4_fd;
-
- t->dns_ipv4_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
- if (t->dns_ipv4_fd < 0)
- return -errno;
-
- r = setsockopt(t->dns_ipv4_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
-
- r = sd_event_add_io(t->scope->manager->event, &t->dns_ipv4_event_source, t->dns_ipv4_fd, EPOLLIN, on_dns_packet, t);
- if (r < 0)
- goto fail;
-
- return t->dns_ipv4_fd;
-
-fail:
- t->dns_ipv4_fd = safe_close(t->dns_ipv4_fd);
- return r;
-}
-
-int transaction_dns_ipv6_fd(DnsTransaction *t) {
- const int one = 1;
- int r;
-
- assert(t);
- assert(t->scope);
- assert(t->scope->manager);
-
- if (t->dns_ipv6_fd >= 0)
- return t->dns_ipv6_fd;
-
- t->dns_ipv6_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
- if (t->dns_ipv6_fd < 0)
- return -errno;
-
- r = setsockopt(t->dns_ipv6_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
-
- r = sd_event_add_io(t->scope->manager->event, &t->dns_ipv6_event_source, t->dns_ipv6_fd, EPOLLIN, on_dns_packet, t);
- if (r < 0)
- goto fail;
-
- return t->dns_ipv6_fd;
-
-fail:
- t->dns_ipv6_fd = safe_close(t->dns_ipv6_fd);
- return r;
-}
-
static const char* const dns_transaction_state_table[_DNS_TRANSACTION_STATE_MAX] = {
[DNS_TRANSACTION_NULL] = "null",
[DNS_TRANSACTION_PENDING] = "pending",
diff --git a/src/resolve/resolved-dns-transaction.h b/src/resolve/resolved-dns-transaction.h
index 87f342ca11..a8f4267bc8 100644
--- a/src/resolve/resolved-dns-transaction.h
+++ b/src/resolve/resolved-dns-transaction.h
@@ -61,11 +61,8 @@ struct DnsTransaction {
sd_event_source *timeout_event_source;
unsigned n_attempts;
- int dns_ipv4_fd;
- int dns_ipv6_fd;
-
- sd_event_source *dns_ipv4_event_source;
- sd_event_source *dns_ipv6_event_source;
+ int dns_fd;
+ sd_event_source *dns_event_source;
/* the active server */
DnsServer *server;
@@ -95,9 +92,6 @@ int dns_transaction_go(DnsTransaction *t);
void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p);
void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state);
-int transaction_dns_ipv4_fd(DnsTransaction *t);
-int transaction_dns_ipv6_fd(DnsTransaction *t);
-
const char* dns_transaction_state_to_string(DnsTransactionState p) _const_;
DnsTransactionState dns_transaction_state_from_string(const char *s) _pure_;
diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c
index 17de14bae1..5be01d3cb8 100644
--- a/src/resolve/resolved-manager.c
+++ b/src/resolve/resolved-manager.c
@@ -912,10 +912,12 @@ int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
if (p->ifindex == LOOPBACK_IFINDEX)
p->ifindex = 0;
- /* If we don't know the interface index still, we look for the
- * first local interface with a matching address. Yuck! */
- if (p->ifindex <= 0)
- p->ifindex = manager_find_ifindex(m, p->family, &p->destination);
+ if (protocol != DNS_PROTOCOL_DNS) {
+ /* If we don't know the interface index still, we look for the
+ * first local interface with a matching address. Yuck! */
+ if (p->ifindex <= 0)
+ p->ifindex = manager_find_ifindex(m, p->family, &p->destination);
+ }
*ret = p;
p = NULL;
@@ -947,6 +949,42 @@ static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
}
}
+static int write_loop(int fd, void *message, size_t length) {
+ int r;
+
+ assert(fd >= 0);
+ assert(message);
+
+ for (;;) {
+ if (write(fd, message, length) >= 0)
+ return 0;
+
+ if (errno == EINTR)
+ continue;
+
+ if (errno != EAGAIN)
+ return -errno;
+
+ r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -ETIMEDOUT;
+ }
+}
+
+int manager_write(Manager *m, int fd, DnsPacket *p) {
+ int r;
+
+ log_debug("Sending %s packet with id %u", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));
+
+ r = write_loop(fd, DNS_PACKET_DATA(p), p->size);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
static int manager_ipv4_send(Manager *m, int fd, int ifindex, const struct in_addr *addr, uint16_t port, DnsPacket *p) {
union sockaddr_union sa = {
.in.sin_family = AF_INET,
diff --git a/src/resolve/resolved-manager.h b/src/resolve/resolved-manager.h
index 005f844df2..53b5acb33c 100644
--- a/src/resolve/resolved-manager.h
+++ b/src/resolve/resolved-manager.h
@@ -119,6 +119,7 @@ void manager_next_dns_server(Manager *m);
uint32_t manager_find_mtu(Manager *m);
+int manager_write(Manager *m, int fd, DnsPacket *p);
int manager_send(Manager *m, int fd, int ifindex, int family, const union in_addr_union *addr, uint16_t port, DnsPacket *p);
int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-09-05 13:31:40 +0000