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76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SANDBOXED_API_SANDBOX2_NETWORK_PROXY_CLIENT_H_
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#define SANDBOXED_API_SANDBOX2_NETWORK_PROXY_CLIENT_H_
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#include <netinet/in.h>
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#include "absl/status/status.h"
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#include "absl/synchronization/mutex.h"
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#include "sandboxed_api/sandbox2/comms.h"
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namespace sandbox2 {
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class NetworkProxyClient {
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public:
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static constexpr char kFDName[] = "sb2_networkproxy";
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explicit NetworkProxyClient(int fd) : comms_(fd) {}
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NetworkProxyClient(const NetworkProxyClient&) = delete;
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NetworkProxyClient& operator=(const NetworkProxyClient&) = delete;
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// Establishes a new network connection.
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// Semantic is similar to a regular connect() call.
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// Arguments are sent to network proxy server, which sends back a connected
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// socket.
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absl::Status Connect(int sockfd, const struct sockaddr* addr,
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socklen_t addrlen);
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// Same as Connect, but with same API as regular connect() call.
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int ConnectHandler(int sockfd, const struct sockaddr* addr,
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socklen_t addrlen);
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private:
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Comms comms_;
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absl::Status ReceiveRemoteResult();
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// Needed to make the Proxy thread safe.
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absl::Mutex mutex_;
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};
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class NetworkProxyHandler {
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public:
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// Installs the handler that redirects connect() syscalls to the trap
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// function. This function exchange data with NetworkProxyServer that checks
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// if this connection is allowed and sends the connected socket to us.
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// In other words, this function just use NetworkProxyClient class.
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static absl::Status InstallNetworkProxyHandler(NetworkProxyClient* npc);
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void ProcessSeccompTrap(int nr, siginfo_t* info, void* void_context);
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private:
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NetworkProxyHandler(NetworkProxyClient* npc) : network_proxy_client_(npc) {
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InstallSeccompTrap();
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}
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void InvokeOldAct(int nr, siginfo_t* info, void* void_context);
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void InstallSeccompTrap();
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struct sigaction oldact_;
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NetworkProxyClient* network_proxy_client_;
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};
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} // namespace sandbox2
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#endif // SANDBOXED_API_SANDBOX2_NETWORK_PROXY_CLIENT_H_
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