eve/dns: make version required

The "eve.version" field is not always logged. Update the schema to
enforce that it is, and fix it for records that don't log it.

Ticket: #7167
(cherry picked from commit fcc1b1067b)

etc/schema.json

@@ -961,6 +961,9 @@
         },
         "dns": {
             "type": "object",
+            "required": [
+                "version"
+            ],
             "properties": {
                 "aa": {
                     "type": "boolean"
@@ -996,6 +999,7 @@
                     "type": "string"
                 },
                 "version": {
+                    "description": "The version of this EVE DNS event",
                     "type": "integer"
                 },
                 "opcode": {

src/output-json-alert.c

@@ -230,6 +230,7 @@ static void AlertJsonDns(const Flow *f, const uint64_t tx_id, JsonBuilder *js)
                                           dns_state, tx_id);
         if (txptr) {
             jb_open_object(js, "dns");
+            jb_set_int(js, "version", 2);
             JsonBuilder *qjs = JsonDNSLogQuery(txptr);
             if (qjs != NULL) {
                 jb_set_object(js, "query", qjs);

src/output-json-dns.c

@@ -323,6 +323,7 @@ static int JsonDnsLoggerToServer(ThreadVars *tv, void *thread_data,
         }
 
         jb_open_object(jb, "dns");
+        jb_set_int(jb, "version", 2);
         if (!rs_dns_log_json_query(txptr, i, td->dnslog_ctx->flags, jb)) {
             jb_free(jb);
             break;