From 1ff7829b49f489dc56532cf960f8df4f40239743 Mon Sep 17 00:00:00 2001
From: Nick Peng <pymumu@gmail.com>
Date: Sat, 9 Sep 2023 17:20:42 +0800
Subject: [PATCH] dns: simple make DDR request SOA.

---
 src/dns.h        |  1 +
 src/dns_server.c | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/src/dns.h b/src/dns.h
index 0ed573a5d3..f52dceb6bd 100644
--- a/src/dns.h
+++ b/src/dns.h
@@ -72,6 +72,7 @@ typedef enum dns_type {
 	DNS_T_SRV = 33,
 	DNS_T_OPT = 41,
 	DNS_T_SSHFP = 44,
+	DNS_T_SVCB = 64,
 	DNS_T_HTTPS = 65,
 	DNS_T_SPF = 99,
 	DNS_T_AXFR = 252,
diff --git a/src/dns_server.c b/src/dns_server.c
index 256d66f94b..e630e61b6c 100644
--- a/src/dns_server.c
+++ b/src/dns_server.c
@@ -3961,6 +3961,20 @@ static int _dns_server_process_ptr(struct dns_request *request)
 	return 0;
 }
 
+static int _dns_server_process_DDR(struct dns_request *request)
+{
+	return _dns_server_reply_SOA(DNS_RC_NOERROR, request);
+}
+
+static int _dns_server_process_srv(struct dns_request *request)
+{
+	if (strncmp("_dns.resolver.arpa", request->domain, DNS_MAX_CNAME_LEN) == 0) {
+		return _dns_server_process_DDR(request);
+	}
+
+	return -1;
+}
+
 static void _dns_server_log_rule(const char *domain, enum domain_rule rule_type, unsigned char *rule_key,
 								 int rule_key_len)
 {
@@ -5147,6 +5161,15 @@ static int _dns_server_process_special_query(struct dns_request *request)
 			request->passthrough = 1;
 		}
 		break;
+	case DNS_T_SVCB:
+		ret = _dns_server_process_srv(request);
+		if (ret == 0) {
+			goto clean_exit;
+		} else {
+			/* pass to upstream server */
+			request->passthrough = 1;
+		}
+		break;
 	case DNS_T_A:
 		break;
 	case DNS_T_AAAA: