src/virtualization/lib/vsh/util.h

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SRC_VIRTUALIZATION_LIB_VSH_UTIL_H_
#define SRC_VIRTUALIZATION_LIB_VSH_UTIL_H_

#include <google/protobuf/message_lite.h>
#include <lib/zx/socket.h>

namespace vsh {

constexpr int kVshPort = 9001;

// Maximum amount of data that can be sent in a single DataMessage. This is
// picked based on the max message size with generous room for protobuf
// overhead.
constexpr size_t kMaxDataSize = 4000;

// Maximum size allowed for a single protobuf message.
constexpr size_t kMaxMessageSize = 4096;

// Reserved keyword for connecting to the VM shell instead of a container.
// All lxd containers must also be valid hostnames, so any string that is
// not a valid hostname will work here without colliding with lxd's naming.
constexpr char kVmShell[] = "/vm_shell";

// Sends a protobuf MessageLite to the given socket.
bool SendMessage(const zx::socket& socket, const google::protobuf::MessageLite& message);

// Receives a protobuf MessageLite from the given socket.
bool RecvMessage(const zx::socket& socket, google::protobuf::MessageLite* message);

}  // namespace vsh

#endif  // SRC_VIRTUALIZATION_LIB_VSH_UTIL_H_