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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef REMOTING_HOST_SECURITY_KEY_SECURITY_KEY_SOCKET_H_ | |
| 6 #define REMOTING_HOST_SECURITY_KEY_SECURITY_KEY_SOCKET_H_ | |
| 7 | |
| 8 #include <stddef.h> | |
| 9 | |
| 10 #include <memory> | |
| 11 #include <string> | |
| 12 #include <vector> | |
| 13 | |
| 14 #include "base/callback.h" | |
| 15 #include "base/macros.h" | |
| 16 #include "base/memory/ref_counted.h" | |
| 17 #include "base/threading/thread_checker.h" | |
| 18 | |
| 19 namespace base { | |
| 20 class Timer; | |
| 21 } // namespace base | |
| 22 | |
| 23 namespace net { | |
| 24 class DrainableIOBuffer; | |
| 25 class IOBufferWithSize; | |
| 26 class StreamSocket; | |
| 27 } // namespace net | |
| 28 | |
| 29 namespace remoting { | |
| 30 | |
| 31 // Class that manages reading requests and sending responses. The socket can | |
| 32 // only handle receiving one request at a time. It expects to receive no extra | |
| 33 // bytes over the wire, which is checked by IsRequestTooLarge method. | |
| 34 class SecurityKeySocket { | |
| 35 public: | |
| 36 SecurityKeySocket(std::unique_ptr<net::StreamSocket> socket, | |
| 37 base::TimeDelta timeout, | |
| 38 const base::Closure& timeout_callback); | |
| 39 ~SecurityKeySocket(); | |
| 40 | |
| 41 // Returns false if the request has not yet completed, or is too large to be | |
| 42 // processed. Otherwise, the cached request data is copied into |data_out| and | |
| 43 // the internal buffer resets and is ready for the next request. | |
| 44 bool GetAndClearRequestData(std::string* data_out); | |
| 45 | |
| 46 // Sends response data to the socket. | |
| 47 void SendResponse(const std::string& data); | |
| 48 | |
| 49 // Sends an SSH error code to the socket. | |
| 50 void SendSshError(); | |
| 51 | |
| 52 // |request_received_callback| is used to notify the caller that request data | |
| 53 // has been fully read, and caller is to use GetAndClearRequestData method to | |
| 54 // get the request data. | |
| 55 void StartReadingRequest(const base::Closure& request_received_callback); | |
| 56 | |
| 57 private: | |
| 58 // Called when bytes are written to |socket_|. | |
| 59 void OnDataWritten(int result); | |
| 60 | |
| 61 // Continues writing to |socket_| if needed. | |
| 62 void DoWrite(); | |
| 63 | |
| 64 // Called when bytes are read from |socket_|. | |
| 65 void OnDataRead(int bytes_read); | |
| 66 | |
| 67 // Continues to read. | |
| 68 void DoRead(); | |
| 69 | |
| 70 // Returns true if the current request is complete. | |
| 71 bool IsRequestComplete() const; | |
| 72 | |
| 73 // Returns true if the stated request size is larger than the allowed maximum. | |
| 74 bool IsRequestTooLarge() const; | |
| 75 | |
| 76 // Returns the stated request length. | |
| 77 size_t GetRequestLength() const; | |
| 78 | |
| 79 // Returns the response length bytes. | |
| 80 std::string GetResponseLengthAsBytes(const std::string& response) const; | |
| 81 | |
| 82 // Resets the socket activity timer. | |
| 83 void ResetTimer(); | |
| 84 | |
| 85 // Ensures SecurityKeySocketSocket methods are called on the same thread. | |
| 86 base::ThreadChecker thread_checker_; | |
| 87 | |
| 88 // The socket. | |
| 89 std::unique_ptr<net::StreamSocket> socket_; | |
| 90 | |
| 91 // Invoked when request data has been read. | |
| 92 base::Closure request_received_callback_; | |
| 93 | |
| 94 // Indicates whether read has completed and |request_received_callback_| is | |
| 95 // about to be run. | |
| 96 bool read_completed_; | |
| 97 | |
| 98 // Request data. | |
| 99 std::vector<char> request_data_; | |
| 100 | |
| 101 scoped_refptr<net::DrainableIOBuffer> write_buffer_; | |
| 102 | |
| 103 scoped_refptr<net::IOBufferWithSize> read_buffer_; | |
| 104 | |
| 105 // The activity timer. | |
| 106 std::unique_ptr<base::Timer> timer_; | |
| 107 | |
| 108 DISALLOW_COPY_AND_ASSIGN(SecurityKeySocket); | |
| 109 }; | |
| 110 | |
| 111 } // namespace remoting | |
| 112 | |
| 113 #endif // REMOTING_HOST_SECURITY_KEY_SECURITY_KEY_SOCKET_H_ | |
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