sandboxed-api/sandboxed_api/sandbox2/network_proxy_client.h

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// Copyright 2019 Google LLC. All Rights Reserved.
//
// 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_CLIENT_H_
#define SANDBOXED_API_SANDBOX2_NETWORK_PROXY_CLIENT_H_
#include <netinet/in.h>
#include "absl/synchronization/mutex.h"
#include "sandboxed_api/sandbox2/comms.h"
#include "sandboxed_api/util/status.h"
namespace sandbox2 {
class NetworkProxyClient {
public:
static constexpr char kFDName[] = "sb2_networkproxy";
explicit NetworkProxyClient(int fd) : comms_(fd) {}
NetworkProxyClient(const NetworkProxyClient&) = delete;
NetworkProxyClient& operator=(const NetworkProxyClient&) = delete;
// Establishes a new network connection.
// Semantic is similar to a regular connect() call.
// Arguments are sent to network proxy server, which sends back a connected
// socket.
sapi::Status Connect(int sockfd, const struct sockaddr* addr,
socklen_t addrlen);
// Same as Connect, but with same API as regular connect() call.
int ConnectHandler(int sockfd, const struct sockaddr* addr,
socklen_t addrlen);
private:
Comms comms_;
sapi::Status ReceiveRemoteResult();
// Needed to make the Proxy thread safe.
absl::Mutex mutex_;
};
class NetworkProxyHandler {
public:
// Installs the handler that redirects connect() syscalls to the trap
// function. This function exchange data with NetworkProxyServer that checks
// if this connection is allowed and sends the connected socket to us.
// In other words, this function just use NetworkProxyClient class.
static sapi::Status InstallNetworkProxyHandler(NetworkProxyClient* npc);
void ProcessSeccompTrap(int nr, siginfo_t* info, void* void_context);
private:
NetworkProxyHandler(NetworkProxyClient* npc) : network_proxy_client_(npc) {
InstallSeccompTrap();
}
void InvokeOldAct(int nr, siginfo_t* info, void* void_context);
void InstallSeccompTrap();
struct sigaction oldact_;
NetworkProxyClient* network_proxy_client_;
};
} // namespace sandbox2
#endif // SANDBOXED_API_SANDBOX2_NETWORK_PROXY_CLIENT_H_