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1 /*
2  * Copyright (C) 2018 The Android Open Source Project
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *  * Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  *  * Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in
12  *    the documentation and/or other materials provided with the
13  *    distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 #pragma once
29 
30 #include <sys/types.h>
31 #include <unistd.h>
32 #include <chrono>
33 #include <cstdlib>
34 #include <fstream>
35 #include <string>
36 #include <vector>
37 
38 #include "usb.h"
39 
40 namespace fastboot {
41 
42 /* A special class for sniffing reads and writes
43  *
44  * A useful debugging tool is to see the raw fastboot transactions going between
45  * the host and device. This class is a special subclass of Transport that snoops and saves
46  * all the transactions going on. Additionally, if there is a console serial port
47  * from the device, this class can monitor it as well and capture the interleaving of
48  * transport transactions and UART log messages.
49  */
50 class TransportSniffer : public Transport {
51   public:
52     enum EventType {
53         READ,
54         WRITE,
55         RESET,
56         SERIAL,  // Serial log message from device
57         READ_ERROR,
58         WRITE_ERROR,
59     };
60 
61     struct Event {
EventEvent62         Event(EventType t, const std::vector<char> cbuf) : type(t), buf(cbuf) {
63             start = std::chrono::high_resolution_clock::now();
64         };
65         EventType type;
66         std::chrono::high_resolution_clock::time_point start;
67         const std::vector<char> buf;
68     };
69 
70     TransportSniffer(std::unique_ptr<Transport> transport, const int serial_fd = 0);
71     ~TransportSniffer() override;
72 
73     virtual ssize_t Read(void* data, size_t len) override;
74     virtual ssize_t Write(const void* data, size_t len) override;
75     virtual int Close() override final;  // note usage in destructor
76     virtual int Reset() override;
77 
78     const std::vector<Event> Transfers();
79     std::string CreateTrace();
80     void ProcessSerial();
81 
82   private:
83     std::vector<Event> transfers_;
84     std::unique_ptr<Transport> transport_;
85     const int serial_fd_;
86 };
87 
88 }  // End namespace fastboot
89