| // 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_CLIENT_H_ |
| #define SANDBOXED_API_SANDBOX2_NETWORK_PROXY_CLIENT_H_ |
| |
| #include <netinet/in.h> |
| |
| #include "absl/status/status.h" |
| #include "absl/synchronization/mutex.h" |
| #include "sandboxed_api/sandbox2/comms.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. |
| absl::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_; |
| absl::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 absl::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_ |