sandboxed-api/sandboxed_api/sandbox2/network_proxy/server.h

69 lines
2.3 KiB
C++

// Copyright 2019 Google LLC
//
// 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.
#ifndef SANDBOXED_API_SANDBOX2_NETWORK_PROXY_SERVER_H_
#define SANDBOXED_API_SANDBOX2_NETWORK_PROXY_SERVER_H_
#include <memory>
#include "sandboxed_api/sandbox2/comms.h"
#include "sandboxed_api/sandbox2/network_proxy/filtering.h"
namespace sandbox2 {
// This is a proxy server that spawns connected sockets on requests.
// Then it sends the file descriptor to the requestor. It is used to get around
// limitations created by network namespaces. It also contains a set of rules
// of allowed hosts.
class NetworkProxyServer {
public:
NetworkProxyServer(int fd, AllowedHosts* allowed_hosts,
pthread_t monitor_thread_id);
NetworkProxyServer(const NetworkProxyServer&) = delete;
NetworkProxyServer& operator=(const NetworkProxyServer&) = delete;
// Starts handling incoming connection requests.
void Run();
// When the network rules were violated violation_occurred_ is set and
// violation_msg_ contains details about the host.
std::atomic<bool> violation_occurred_;
std::string violation_msg_;
private:
// Notifies the network proxy client about the error and sends its code.
void SendError(int saved_errno);
// Notifies the network proxy client that no error occurred.
void NotifySuccess();
// Serves connection requests from the network proxy client.
void ProcessConnectRequest();
// Throw a violation when the network rules are subverted.
void NotifyViolation(const struct sockaddr* saddr);
std::unique_ptr<Comms> comms_;
bool fatal_error_;
pthread_t monitor_thread_id_;
// Contains list of allowed to connect hosts.
AllowedHosts* allowed_hosts_;
};
} // namespace sandbox2
#endif // SANDBOXED_API_SANDBOX2_NETWORK_PROXY_SERVER_H_