// Copyright 2020 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

syntax = "proto3";

package posix_server;

message SockaddrIn {
  int32 family = 1;
  uint32 port = 2;
  bytes addr = 3;
}

message SockaddrIn6 {
  uint32 family = 1;
  uint32 port = 2;
  uint32 flowinfo = 3;
  bytes addr = 4;
  uint32 scope_id = 5;
}

message Sockaddr {
  oneof sockaddr {
    SockaddrIn in = 1;
    SockaddrIn6 in6 = 2;
  }
}

message Timeval {
  int64 seconds = 1;
  int64 microseconds = 2;
}

// Request and Response pairs for each Posix service RPC call, sorted.

message AcceptRequest {
  int32 sockfd = 1;
}

message AcceptResponse {
  int32 fd = 1;
  int32 errno_ = 2;  // "errno" may fail to compile in c++.
  Sockaddr addr = 3;
}

message BindRequest {
  int32 sockfd = 1;
  Sockaddr addr = 2;
}

message BindResponse {
  int32 ret = 1;
  int32 errno_ = 2;  // "errno" may fail to compile in c++.
}

message CloseRequest {
  int32 fd = 1;
}

message CloseResponse {
  int32 ret = 1;
  int32 errno_ = 2;  // "errno" may fail to compile in c++.
}

message GetSockNameRequest {
  int32 sockfd = 1;
}

message GetSockNameResponse {
  int32 ret = 1;
  int32 errno_ = 2;  // "errno" may fail to compile in c++.
  Sockaddr addr = 3;
}

message ListenRequest {
  int32 sockfd = 1;
  int32 backlog = 2;
}

message ListenResponse {
  int32 ret = 1;
  int32 errno_ = 2;  // "errno" may fail to compile in c++.
}

message SetSockOptRequest {
  int32 sockfd = 1;
  int32 level = 2;
  int32 optname = 3;
  bytes optval = 4;
}

message SetSockOptResponse {
  int32 ret = 1;
  int32 errno_ = 2;  // "errno" may fail to compile in c++.
}

message SetSockOptTimevalRequest {
  int32 sockfd = 1;
  int32 level = 2;
  int32 optname = 3;
  Timeval timeval = 4;
}

message SetSockOptTimevalResponse {
  int32 ret = 1;
  int32 errno_ = 2;  // "errno" may fail to compile in c++.
}

message SocketRequest {
  int32 domain = 1;
  int32 type = 2;
  int32 protocol = 3;
}

message SocketResponse {
  int32 fd = 1;
  int32 errno_ = 2;  // "errno" may fail to compile in c++.
}

message RecvRequest {
  int32 sockfd = 1;
  int32 len = 2;
  int32 flags = 3;
}

message RecvResponse {
  int32 ret = 1;
  int32 errno_ = 2;  // "errno" may fail to compile in c++.
  bytes buf = 3;
}

service Posix {
  // Call accept() on the DUT.
  rpc Accept(AcceptRequest) returns (AcceptResponse);
  // Call bind() on the DUT.
  rpc Bind(BindRequest) returns (BindResponse);
  // Call close() on the DUT.
  rpc Close(CloseRequest) returns (CloseResponse);
  // Call getsockname() on the DUT.
  rpc GetSockName(GetSockNameRequest) returns (GetSockNameResponse);
  // Call listen() on the DUT.
  rpc Listen(ListenRequest) returns (ListenResponse);
  // Call setsockopt() on the DUT.  You should prefer one of the other
  // SetSockOpt* functions with a more structured optval or else you may get the
  // encoding wrong, such as making a bad assumption about the server's word
  // sizes or endianness.
  rpc SetSockOpt(SetSockOptRequest) returns (SetSockOptResponse);
  // Call setsockopt() on the DUT with a Timeval optval.
  rpc SetSockOptTimeval(SetSockOptTimevalRequest)
      returns (SetSockOptTimevalResponse);
  // Call socket() on the DUT.
  rpc Socket(SocketRequest) returns (SocketResponse);
  // Call recv() on the DUT.
  rpc Recv(RecvRequest) returns (RecvResponse);
}