syntax = "proto3";

package envoy.config.core.v3;

import "envoy/config/core/v3/address.proto";

import "udpa/annotations/status.proto";
import "validate/validate.proto";

option java_package = "io.envoyproxy.envoy.config.core.v3";
option java_outer_classname = "ResolverProto";
option java_multiple_files = true;
option (udpa.annotations.file_status).package_version_status = ACTIVE;

// [#protodoc-title: Resolver]

// Configuration of DNS resolver option flags which control the behavior of the DNS resolver.
message DnsResolverOptions {
  // Use TCP for all DNS queries instead of the default protocol UDP.
  // Setting this value causes failure if the
  // ``envoy.restart_features.use_apple_api_for_dns_lookups`` runtime value is true during
  // server startup. Apple's API only uses UDP for DNS resolution.
  bool use_tcp_for_dns_lookups = 1;

  // Do not use the default search domains; only query hostnames as-is or as aliases.
  bool no_default_search_domain = 2;
}

// DNS resolution configuration which includes the underlying dns resolver addresses and options.
message DnsResolutionConfig {
  // A list of dns resolver addresses. If specified, the DNS client library will perform resolution
  // via the underlying DNS resolvers. Otherwise, the default system resolvers
  // (e.g., /etc/resolv.conf) will be used.
  // Setting this value causes failure if the
  // ``envoy.restart_features.use_apple_api_for_dns_lookups`` runtime value is true during
  // server startup. Apple's API only allows overriding DNS resolvers via system settings.
  repeated Address resolvers = 1 [(validate.rules).repeated = {min_items: 1}];

  // Configuration of DNS resolver option flags which control the behavior of the DNS resolver.
  DnsResolverOptions dns_resolver_options = 2;
}