resolved: add dns_resource_key_from_json() helper

It reverse what dns_resource_key_to_json(), i.e. turns JSON data into a
parsed DnsResourceKey object.

Ultimately this just moves a client-side local wrapper into generic
code. Nothing truly new here.

3 files changed, 30 insertions, 29 deletions

diff --git a/src/resolve/resolvectl.c b/src/resolve/resolvectl.c
index e65fbbcbab..3de0a4e9d9 100644
--- a/src/resolve/resolvectl.c
+++ b/src/resolve/resolvectl.c
@@ -2586,34 +2586,6 @@ static int verb_log_level(int argc, char *argv[], void *userdata) {
         return verb_log_control_common(bus, "org.freedesktop.resolve1", argv[0], argc == 2 ? argv[1] : NULL);
 }
 
-static int monitor_rkey_from_json(JsonVariant *v, DnsResourceKey **ret_key) {
-        _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
-        uint16_t type = 0, class = 0;
-        const char *name = NULL;
-        int r;
-
-        JsonDispatch dispatch_table[] = {
-                { "class", JSON_VARIANT_INTEGER, json_dispatch_uint16,       PTR_TO_SIZE(&class), JSON_MANDATORY },
-                { "type",  JSON_VARIANT_INTEGER, json_dispatch_uint16,       PTR_TO_SIZE(&type),  JSON_MANDATORY },
-                { "name",  JSON_VARIANT_STRING,  json_dispatch_const_string, PTR_TO_SIZE(&name),  JSON_MANDATORY },
-                {}
-        };
-
-        assert(v);
-        assert(ret_key);
-
-        r = json_dispatch(v, dispatch_table, NULL, 0, NULL);
-        if (r < 0)
-                return r;
-
-        key = dns_resource_key_new(class, type, name);
-        if (!key)
-                return -ENOMEM;
-
-        *ret_key = TAKE_PTR(key);
-        return 0;
-}
-
 static int print_question(char prefix, const char *color, JsonVariant *question) {
         JsonVariant *q = NULL;
         int r;
@@ -2624,7 +2596,7 @@ static int print_question(char prefix, const char *color, JsonVariant *question)
                 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
                 char buf[DNS_RESOURCE_KEY_STRING_MAX];
 
-                r = monitor_rkey_from_json(q, &key);
+                r = dns_resource_key_from_json(q, &key);
                 if (r < 0) {
                         log_warning_errno(r, "Received monitor message with invalid question key, ignoring: %m");
                         continue;
diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c
index 603bb1a10d..f6344542d6 100644
--- a/src/resolve/resolved-dns-rr.c
+++ b/src/resolve/resolved-dns-rr.c
@@ -1853,6 +1853,34 @@ int dns_resource_key_to_json(DnsResourceKey *key, JsonVariant **ret) {
                                           JSON_BUILD_PAIR("name", JSON_BUILD_STRING(dns_resource_key_name(key)))));
 }
 
+int dns_resource_key_from_json(JsonVariant *v, DnsResourceKey **ret) {
+        _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
+        uint16_t type = 0, class = 0;
+        const char *name = NULL;
+        int r;
+
+        JsonDispatch dispatch_table[] = {
+                { "class", JSON_VARIANT_INTEGER, json_dispatch_uint16,       PTR_TO_SIZE(&class), JSON_MANDATORY },
+                { "type",  JSON_VARIANT_INTEGER, json_dispatch_uint16,       PTR_TO_SIZE(&type),  JSON_MANDATORY },
+                { "name",  JSON_VARIANT_STRING,  json_dispatch_const_string, PTR_TO_SIZE(&name),  JSON_MANDATORY },
+                {}
+        };
+
+        assert(v);
+        assert(ret);
+
+        r = json_dispatch(v, dispatch_table, NULL, 0, NULL);
+        if (r < 0)
+                return r;
+
+        key = dns_resource_key_new(class, type, name);
+        if (!key)
+                return -ENOMEM;
+
+        *ret = TAKE_PTR(key);
+        return 0;
+}
+
 static int type_bitmap_to_json(Bitmap *b, JsonVariant **ret) {
         _cleanup_(json_variant_unrefp) JsonVariant *l = NULL;
         unsigned t;
diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h
index 024cfb8744..a3fa24eaf9 100644
--- a/src/resolve/resolved-dns-rr.h
+++ b/src/resolve/resolved-dns-rr.h
@@ -368,6 +368,7 @@ int dns_txt_item_new_empty(DnsTxtItem **ret);
 int dns_resource_record_new_from_raw(DnsResourceRecord **ret, const void *data, size_t size);
 
 int dns_resource_key_to_json(DnsResourceKey *key, JsonVariant **ret);
+int dns_resource_key_from_json(JsonVariant *v, DnsResourceKey **ret);
 int dns_resource_record_to_json(DnsResourceRecord *rr, JsonVariant **ret);
 
 void dns_resource_record_hash_func(const DnsResourceRecord *i, struct siphash *state);