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-rw-r--r--src/resolve/resolved-dns-question.c117
1 files changed, 92 insertions, 25 deletions
diff --git a/src/resolve/resolved-dns-question.c b/src/resolve/resolved-dns-question.c
index 3249448d3b..1e41a9aa3c 100644
--- a/src/resolve/resolved-dns-question.c
+++ b/src/resolve/resolved-dns-question.c
@@ -21,6 +21,7 @@
#include "alloc-util.h"
#include "dns-domain.h"
+#include "dns-type.h"
#include "resolved-dns-question.h"
DnsQuestion *dns_question_new(unsigned n) {
@@ -107,7 +108,7 @@ int dns_question_matches_rr(DnsQuestion *q, DnsResourceRecord *rr, const char *s
return 0;
}
-int dns_question_matches_cname(DnsQuestion *q, DnsResourceRecord *rr, const char *search_domain) {
+int dns_question_matches_cname_or_dname(DnsQuestion *q, DnsResourceRecord *rr, const char *search_domain) {
unsigned i;
int r;
@@ -116,8 +117,15 @@ int dns_question_matches_cname(DnsQuestion *q, DnsResourceRecord *rr, const char
if (!q)
return 0;
+ if (!IN_SET(rr->key->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME))
+ return 0;
+
for (i = 0; i < q->n_keys; i++) {
- r = dns_resource_key_match_cname(q->keys[i], rr, search_domain);
+ /* For a {C,D}NAME record we can never find a matching {C,D}NAME record */
+ if (!dns_type_may_redirect(q->keys[i]->type))
+ return 0;
+
+ r = dns_resource_key_match_cname_or_dname(q->keys[i], rr->key, search_domain);
if (r != 0)
return r;
}
@@ -144,18 +152,23 @@ int dns_question_is_valid_for_query(DnsQuestion *q) {
return 0;
/* Check that all keys in this question bear the same name */
- for (i = 1; i < q->n_keys; i++) {
+ for (i = 0; i < q->n_keys; i++) {
assert(q->keys[i]);
- r = dns_name_equal(DNS_RESOURCE_KEY_NAME(q->keys[i]), name);
- if (r <= 0)
- return r;
+ if (i > 0) {
+ r = dns_name_equal(DNS_RESOURCE_KEY_NAME(q->keys[i]), name);
+ if (r <= 0)
+ return r;
+ }
+
+ if (!dns_type_is_valid_query(q->keys[i]->type))
+ return 0;
}
return 1;
}
-int dns_question_contains(DnsQuestion *a, DnsResourceKey *k) {
+int dns_question_contains(DnsQuestion *a, const DnsResourceKey *k) {
unsigned j;
int r;
@@ -177,6 +190,9 @@ int dns_question_is_equal(DnsQuestion *a, DnsQuestion *b) {
unsigned j;
int r;
+ if (a == b)
+ return 1;
+
if (!a)
return !b || b->n_keys == 0;
if (!b)
@@ -201,32 +217,27 @@ int dns_question_is_equal(DnsQuestion *a, DnsQuestion *b) {
int dns_question_cname_redirect(DnsQuestion *q, const DnsResourceRecord *cname, DnsQuestion **ret) {
_cleanup_(dns_question_unrefp) DnsQuestion *n = NULL;
+ DnsResourceKey *key;
bool same = true;
- unsigned i;
int r;
assert(cname);
assert(ret);
assert(IN_SET(cname->key->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME));
- if (!q) {
- n = dns_question_new(0);
- if (!n)
- return -ENOMEM;
-
- *ret = n;
- n = 0;
+ if (dns_question_size(q) <= 0) {
+ *ret = NULL;
return 0;
}
- for (i = 0; i < q->n_keys; i++) {
+ DNS_QUESTION_FOREACH(key, q) {
_cleanup_free_ char *destination = NULL;
const char *d;
if (cname->key->type == DNS_TYPE_CNAME)
d = cname->cname.name;
else {
- r = dns_name_change_suffix(DNS_RESOURCE_KEY_NAME(q->keys[i]), DNS_RESOURCE_KEY_NAME(cname->key), cname->dname.name, &destination);
+ r = dns_name_change_suffix(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(cname->key), cname->dname.name, &destination);
if (r < 0)
return r;
if (r == 0)
@@ -235,7 +246,7 @@ int dns_question_cname_redirect(DnsQuestion *q, const DnsResourceRecord *cname,
d = destination;
}
- r = dns_name_equal(DNS_RESOURCE_KEY_NAME(q->keys[i]), d);
+ r = dns_name_equal(DNS_RESOURCE_KEY_NAME(key), d);
if (r < 0)
return r;
@@ -245,9 +256,9 @@ int dns_question_cname_redirect(DnsQuestion *q, const DnsResourceRecord *cname,
}
}
+ /* Fully the same, indicate we didn't do a thing */
if (same) {
- /* Shortcut, the names are already right */
- *ret = dns_question_ref(q);
+ *ret = NULL;
return 0;
}
@@ -256,10 +267,10 @@ int dns_question_cname_redirect(DnsQuestion *q, const DnsResourceRecord *cname,
return -ENOMEM;
/* Create a new question, and patch in the new name */
- for (i = 0; i < q->n_keys; i++) {
+ DNS_QUESTION_FOREACH(key, q) {
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *k = NULL;
- k = dns_resource_key_new_redirect(q->keys[i], cname);
+ k = dns_resource_key_new_redirect(key, cname);
if (!k)
return -ENOMEM;
@@ -285,8 +296,9 @@ const char *dns_question_first_name(DnsQuestion *q) {
return DNS_RESOURCE_KEY_NAME(q->keys[0]);
}
-int dns_question_new_address(DnsQuestion **ret, int family, const char *name) {
+int dns_question_new_address(DnsQuestion **ret, int family, const char *name, bool convert_idna) {
_cleanup_(dns_question_unrefp) DnsQuestion *q = NULL;
+ _cleanup_free_ char *buf = NULL;
int r;
assert(ret);
@@ -295,6 +307,14 @@ int dns_question_new_address(DnsQuestion **ret, int family, const char *name) {
if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC))
return -EAFNOSUPPORT;
+ if (convert_idna) {
+ r = dns_name_apply_idna(name, &buf);
+ if (r < 0)
+ return r;
+
+ name = buf;
+ }
+
q = dns_question_new(family == AF_UNSPEC ? 2 : 1);
if (!q)
return -ENOMEM;
@@ -365,13 +385,60 @@ int dns_question_new_reverse(DnsQuestion **ret, int family, const union in_addr_
return 0;
}
-int dns_question_new_service(DnsQuestion **ret, const char *name, bool with_txt) {
+int dns_question_new_service(
+ DnsQuestion **ret,
+ const char *service,
+ const char *type,
+ const char *domain,
+ bool with_txt,
+ bool convert_idna) {
+
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
_cleanup_(dns_question_unrefp) DnsQuestion *q = NULL;
+ _cleanup_free_ char *buf = NULL, *joined = NULL;
+ const char *name;
int r;
assert(ret);
- assert(name);
+
+ /* We support three modes of invocation:
+ *
+ * 1. Only a domain is specified, in which case we assume a properly encoded SRV RR name, including service
+ * type and possibly a service name. If specified in this way we assume it's already IDNA converted if
+ * that's necessary.
+ *
+ * 2. Both service type and a domain specified, in which case a normal SRV RR is assumed, without a DNS-SD
+ * style prefix. In this case we'll IDNA convert the domain, if that's requested.
+ *
+ * 3. All three of service name, type and domain are specified, in which case a DNS-SD service is put
+ * together. The service name is never IDNA converted, and the domain is if requested.
+ *
+ * It's not supported to specify a service name without a type, or no domain name.
+ */
+
+ if (!domain)
+ return -EINVAL;
+
+ if (type) {
+ if (convert_idna) {
+ r = dns_name_apply_idna(domain, &buf);
+ if (r < 0)
+ return r;
+
+ domain = buf;
+ }
+
+ r = dns_service_join(service, type, domain, &joined);
+ if (r < 0)
+ return r;
+
+ name = joined;
+ } else {
+ if (service)
+ return -EINVAL;
+
+ name = domain;
+ }
q = dns_question_new(1 + with_txt);
if (!q)
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-03 05:17:56 +0000