1 // Copyright 2019 Google LLC 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef SANDBOXED_API_RPCCHANNEL_H_ 16 #define SANDBOXED_API_RPCCHANNEL_H_ 17 18 #include <cstddef> 19 #include <cstdint> 20 21 #include "absl/status/status.h" 22 #include "absl/status/statusor.h" 23 #include "absl/synchronization/mutex.h" 24 #include "sandboxed_api/call.h" 25 #include "sandboxed_api/sandbox2/comms.h" 26 #include "sandboxed_api/var_type.h" 27 28 namespace sapi { 29 30 // This class exposes functions which provide primitives operating over the 31 // Comms channel. 32 class RPCChannel { 33 public: RPCChannel(sandbox2::Comms * comms)34 explicit RPCChannel(sandbox2::Comms* comms) : comms_(comms) {} 35 36 // Calls a function. 37 absl::Status Call(const FuncCall& call, uint32_t tag, FuncRet* ret, 38 v::Type exp_type); 39 40 // Allocates memory. 41 absl::Status Allocate(size_t size, void** addr); 42 43 // Reallocates memory. 44 absl::Status Reallocate(void* old_addr, size_t size, void** new_addr); 45 46 // Frees memory. 47 absl::Status Free(void* addr); 48 49 // Returns address of a symbol. 50 absl::Status Symbol(const char* symname, void** addr); 51 52 // Makes the remote part exit. 53 absl::Status Exit(); 54 55 // Transfers fd to sandboxee. 56 absl::Status SendFD(int local_fd, int* remote_fd); 57 58 // Retrieves fd from sandboxee. 59 absl::Status RecvFD(int remote_fd, int* local_fd); 60 61 // Closes fd in sandboxee. 62 absl::Status Close(int remote_fd); 63 64 // Returns length of a null-terminated c-style string (invokes strlen). 65 absl::StatusOr<size_t> Strlen(void* str); 66 comms()67 sandbox2::Comms* comms() const { return comms_; } 68 69 private: 70 // Receives the result after a call. 71 absl::StatusOr<FuncRet> Return(v::Type exp_type); 72 73 sandbox2::Comms* comms_; // Owned by sandbox2; 74 absl::Mutex mutex_; 75 }; 76 77 } // namespace sapi 78 79 #endif // SANDBOXED_API_RPCCHANNEL_H_ 80