resolved: allow building without libgcrypt

Makefile.am

@@ -5184,7 +5184,6 @@ EXTRA_DIST += \
 
 # ------------------------------------------------------------------------------
 if ENABLE_RESOLVED
-if HAVE_GCRYPT
 
 systemd_resolved_SOURCES = \
 	src/resolve/resolved.c \
@@ -5355,7 +5354,6 @@ test_dnssec_complex_LDADD = \
 	libshared.la
 
 endif
-endif
 
 gperf_txt_sources += \
 	src/resolve/dns_type-list.txt

src/resolve/resolved-dns-dnssec.c

@@ -19,7 +19,9 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#ifdef HAVE_GCRYPT
 #include <gcrypt.h>
+#endif
 
 #include "alloc-util.h"
 #include "dns-domain.h"
@@ -124,6 +126,8 @@ int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max) {
         return (int) c;
 }
 
+#ifdef HAVE_GCRYPT
+
 static void initialize_libgcrypt(void) {
         const char *p;
 
@@ -2114,6 +2118,77 @@ int dnssec_test_positive_wildcard(
                 return dnssec_test_positive_wildcard_nsec(answer, name, source, zone, authenticated);
 }
 
+#else
+
+int dnssec_verify_rrset(
+                DnsAnswer *a,
+                const DnsResourceKey *key,
+                DnsResourceRecord *rrsig,
+                DnsResourceRecord *dnskey,
+                usec_t realtime,
+                DnssecResult *result) {
+
+        return -EOPNOTSUPP;
+}
+
+int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnskey, bool revoked_ok) {
+
+        return -EOPNOTSUPP;
+}
+
+int dnssec_key_match_rrsig(const DnsResourceKey *key, DnsResourceRecord *rrsig) {
+
+        return -EOPNOTSUPP;
+}
+
+int dnssec_verify_rrset_search(
+                DnsAnswer *a,
+                const DnsResourceKey *key,
+                DnsAnswer *validated_dnskeys,
+                usec_t realtime,
+                DnssecResult *result,
+                DnsResourceRecord **ret_rrsig) {
+
+        return -EOPNOTSUPP;
+}
+
+int dnssec_has_rrsig(DnsAnswer *a, const DnsResourceKey *key) {
+
+        return -EOPNOTSUPP;
+}
+
+int dnssec_verify_dnskey_by_ds(DnsResourceRecord *dnskey, DnsResourceRecord *ds, bool mask_revoke) {
+
+        return -EOPNOTSUPP;
+}
+
+int dnssec_verify_dnskey_by_ds_search(DnsResourceRecord *dnskey, DnsAnswer *validated_ds) {
+
+        return -EOPNOTSUPP;
+}
+
+int dnssec_nsec3_hash(DnsResourceRecord *nsec3, const char *name, void *ret) {
+
+        return -EOPNOTSUPP;
+}
+
+int dnssec_nsec_test(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated, uint32_t *ttl) {
+
+        return -EOPNOTSUPP;
+}
+
+int dnssec_test_positive_wildcard(
+                DnsAnswer *answer,
+                const char *name,
+                const char *source,
+                const char *zone,
+                bool *authenticated) {
+
+        return -EOPNOTSUPP;
+}
+
+#endif
+
 static const char* const dnssec_result_table[_DNSSEC_RESULT_MAX] = {
         [DNSSEC_VALIDATED] = "validated",
         [DNSSEC_VALIDATED_WILDCARD] = "validated-wildcard",