syntax = "proto2";
import "session_event.proto";

message Event_ServerIdentification {
    extend SessionEvent {
        optional Event_ServerIdentification ext = 500;
    }
    enum ServerOptions {
        NoOptions = 0;
        SupportsPasswordHash = 1;
    }
    optional string server_name = 1;
    optional string server_version = 2;
    optional uint32 protocol_version = 3;
    optional ServerOptions server_options = 4 [default = NoOptions];
    // Advertises challenge-response authentication separately from server_options.
    // server_options must stay exactly SupportsPasswordHash on the wire: it is a
    // proto2 enum (closed), so already-released clients compiled without any new
    // enumerator parse an unknown value as NoOptions and fall back to sending
    // the plaintext password. New clients check this field instead.
    optional bool supports_challenge_response = 5;
}