bind-option: support force aaaa soa bind option, secondary DNS support Force-AAAA-SOA options

src/dns_conf.c

@@ -853,6 +853,7 @@ static int _config_bind_ip(int argc, char *argv[], DNS_BIND_TYPE type)
 		{"no-speed-check", no_argument, NULL, 'S'},  
 		{"no-cache", no_argument, NULL, 'C'},  
 		{"no-dualstack-selection", no_argument, NULL, 'D'},
+		{"force-aaaa-soa", no_argument, NULL, 'F'},
 		{NULL, no_argument, NULL, 0}
 	};
 	/* clang-format on */
@@ -918,6 +919,10 @@ static int _config_bind_ip(int argc, char *argv[], DNS_BIND_TYPE type)
 			server_flag |= BIND_FLAG_NO_DUALSTACK_SELECTION;
 			break;
 		}
+		case 'F': {
+			server_flag |= BIND_FLAG_FORCE_AAAA_SOA;
+			break;
+		}
 		default:
 			break;
 		}

src/dns_conf.h

@@ -90,6 +90,7 @@ typedef enum {
 #define BIND_FLAG_NO_SPEED_CHECK (1 << 5)
 #define BIND_FLAG_NO_CACHE (1 << 6)
 #define BIND_FLAG_NO_DUALSTACK_SELECTION (1 << 7)
+#define BIND_FLAG_FORCE_AAAA_SOA (1 << 8) 
 
 struct dns_rule_flags {
 	unsigned int flags;

src/dns_server.c

@@ -261,8 +261,10 @@ static int _dns_server_is_return_soa(struct dns_request *request)
 		return 0;
 	}
 
-	if (dns_conf_force_AAAA_SOA == 1 && request->qtype == DNS_T_AAAA) {
-		return 1;
+	if (request->qtype == DNS_T_AAAA) {
+		if (_dns_server_has_bind_flag(request, BIND_FLAG_FORCE_AAAA_SOA) == 0 || dns_conf_force_AAAA_SOA == 1) {
+			return 1;
+		}
 	}
 
 	rule_flag = request->domain_rule.rules[DOMAIN_RULE_FLAGS];