STC15W204S

逆向STC-ISP V6.85I(Bus Hound)


雖然使用IDA Pro可以完整逆出原始程式碼的樣子,不過需要花費一些時間,因此,司徒打算使用較快速的方式,那就是使用Bus Hound錄取資料的傳輸過程並且參考網路上既有的逆向Protocol,這樣司徒就可以模仿傳送資料,達到在N900上燒錄的目標,接著就讓司徒介紹一下這個過程。

首先寫一個最簡單的GPIO輸出程式並且在Keil C上編譯輸出Hex檔案,主程式如下:

sfr p3 = 0xb0;

void main(void)
{
  p3 = 0x00;
  while(1);
}

Hex內容如下:

02 00 11 75 80 FF 75 90 FF 75 A0 FF E4 F5 B0 80 
FE 78 7F E4 F6 D8 FD 75 81 07 02 00 03 00 

Bus Hound錄到的燒錄過程:

Bus Hound 6.01 capture on Windows XP Service Pack 3 (x86). Complements of www.perisoft.net

  Device - Device ID (followed by the endpoint for USB devices)
            (15) Prolific USB-to-Serial Comm Port (COM3)
  Address - FireWire async address or channel number
  Length - Total transfer length
  Phase  - Phase Type
            IN    Data in transfer           
            OUT   Data out transfer          
  Data   - Hex dump of the data transferred
  Descr  - Description of the phase
  Cmd... - Position in the captured data


Device  Address              Length    Phase  Data                      Description       Cmd.Phase.Ofs(rep)
------  -------------------  --------  -----  ------------------------  ----------------  ------------------
  15                                1  OUT    7f                        .                        1.1.0        
  15                                1  IN     00                        .                        2.1.0        
  15                                1  OUT    7f                        .                        3.1.0(204)   
  15                                1  IN     46                        F                      207.1.0        
  15                                1  IN     b9                        .                      208.1.0        
  15                                1  IN     68                        h                      209.1.0        
  15                                1  IN     00                        .                      210.1.0        
  15                                1  IN     34                        4                      211.1.0        
  15                               49  IN     50 91 11 6a  8a f7 ba 9f  P..j....               212.1.0        
                                              00 a8 ee e0  fd 26 03 03  .....&..               212.1.8        
                                              81 72 54 00  f5 14 04 06  .rT.....               212.1.16       
                                              70 8a 02 29  2b 2f 30 2c  p..)+/0,               212.1.24       
                                              00 14 10 04  e7 ec 6b bf  ......k.               212.1.32       
                                              ff ff 15 08  25 01 12 0c  ....%...               212.1.40       
                                              16                        .                      212.1.48       
  15                               34  OUT    46 b9 6a 00  20 00 0b 00  F.j. ...               213.1.0        
                                              c0 80 c0 ff  c0 00 80 80  ........               213.1.8        
                                              80 ff 80 00  40 80 40 ff  ....@.@.               213.1.16       
                                              40 00 00 80  00 00 00 0a  @.......               213.1.24       
                                              12 16                     ..                     213.1.32       
  15                                1  OUT    fe                        .                      214.1.0(23)    
  15                                1  IN     46                        F                      237.1.0        
  15                                1  IN     b9                        .                      238.1.0        
  15                                1  IN     68                        h                      239.1.0        
  15                                1  IN     00                        .                      240.1.0        
  15                                1  IN     20                                               241.1.0        
  15                               29  IN     00 0b 0d 58  13 07 18 c0  ...X....               242.1.0        
                                              1a 82 25 ae  30 da 36 1b  ..%.0.6.               242.1.8        
                                              4c 55 61 db  54 c5 76 08  LUa.T.v.               242.1.16       
                                              00 00 08 28  16           ...(.                  242.1.24       
  15                               34  OUT    46 b9 6a 00  20 00 0c 69  F.j. ..i               243.1.0        
                                              80 6a 80 6b  80 6c 80 6d  .j.k.l.m               243.1.8        
                                              80 6e 80 64  40 65 40 66  .n.d@e@f               243.1.16       
                                              40 67 40 68  40 69 40 0a  @g@h@i@.               243.1.24       
                                              02 16                     ..                     243.1.32       
  15                                1  OUT    fe                        .                      244.1.0(21)    
  15                                1  IN     46                        F                      265.1.0        
  15                                1  IN     b9                        .                      266.1.0        
  15                                1  IN     68                        h                      267.1.0        
  15                                1  IN     00                        .                      268.1.0        
  15                                1  IN     20                                               269.1.0        
  15                               29  IN     00 0c 23 dd  23 fb 24 0f  ..#.#.$.               270.1.0        
                                              24 32 24 4b  24 64 47 ff  $2$K$dG.               270.1.8        
                                              48 2c 48 63  48 90 48 81  H,HcH.H.               270.1.16       
                                              48 a4 09 24  16           H..$.                  270.1.24       
  15                               16  OUT    46 b9 6a 00  0e 01 64 40  F.j...d@               271.1.0        
                                              ff d0 80 6b  81 04 58 16  ...k..X.               271.1.8        
  15                                1  IN     46                        F                      272.1.0        
  15                                1  IN     b9                        .                      273.1.0        
  15                                1  IN     68                        h                      274.1.0        
  15                                1  IN     00                        .                      275.1.0        
  15                                1  IN     07                        .                      276.1.0        
  15                                4  IN     01 00 70 16               ..p.                   277.1.0        
  15                               13  OUT    46 b9 6a 00  0b 05 00 00  F.j.....               278.1.0        
                                              5a a5 01 79  16           Z..y.                  278.1.8        
  15                                1  IN     46                        F                      279.1.0        
  15                                1  IN     b9                        .                      280.1.0        
  15                                1  IN     68                        h                      281.1.0        
  15                                1  IN     00                        .                      282.1.0        
  15                                1  IN     07                        .                      283.1.0        
  15                                4  IN     05 00 74 16               ..t.                   284.1.0        
  15                               13  OUT    46 b9 6a 00  0b 03 00 00  F.j.....               285.1.0        
                                              5a a5 01 77  16           Z..w.                  285.1.8        
  15                                1  IN     46                        F                      286.1.0        
  15                                1  IN     b9                        .                      287.1.0        
  15                                1  IN     68                        h                      288.1.0        
  15                                1  IN     00                        .                      289.1.0        
  15                                1  IN     0e                        .                      290.1.0        
  15                               11  IN     03 f5 14 00  d6 05 aa 28  .......(               291.1.0        
                                              03 2f 16                  ./.                    291.1.8        
  15                              141  OUT    46 b9 6a 00  8b 22 00 00  F.j.."..               292.1.0        
                                              5a a5 02 00  11 75 80 ff  Z....u..               292.1.8        
                                              75 90 ff 75  a0 ff e4 f5  u..u....               292.1.16       
                                              b0 80 fe 78  7f e4 f6 d8  ...x....               292.1.24       
                                              fd 75 81 07  02 00 03 ff  .u......               292.1.32       
                                              ff ff ff ff  ff ff ff ff  ........               292.1.40       
                                              ff ff ff ff  ff ff ff ff  ........               292.1.48       
                                              ff ff ff ff  ff ff ff ff  ........               292.1.56       
                                              ff ff ff ff  ff ff ff ff  ........               292.1.64       
                                              ff ff ff ff  ff ff ff ff  ........               292.1.72       
                                              ff ff ff ff  ff ff ff ff  ........               292.1.80       
                                              ff ff ff ff  ff ff ff ff  ........               292.1.88       
                                              ff ff ff ff  ff ff ff ff  ........               292.1.96       
                                              ff ff ff ff  ff ff ff ff  ........               292.1.104      
                                              ff ff ff ff  ff ff ff ff  ........               292.1.112      
                                              ff ff ff ff  ff ff ff ff  ........               292.1.120      
                                              ff ff ff ff  ff ff ff ff  ........               292.1.128      
                                              ff ff 74 81  16           ..t..                  292.1.136      
  15                                1  IN     46                        F                      293.1.0        
  15                                1  IN     b9                        .                      294.1.0        
  15                                1  IN     68                        h                      295.1.0        
  15                                1  IN     00                        .                      296.1.0        
  15                                1  IN     08                        .                      297.1.0        
  15                                5  IN     02 54 00 c6  16           .T...                  298.1.0        
  15                              141  OUT    46 b9 6a 00  8b 02 00 80  F.j.....               299.1.0        
                                              5a a5 ff ff  ff ff ff ff  Z.......               299.1.8        
                                              ff ff ff ff  ff ff ff ff  ........               299.1.16       
                                              ff ff ff ff  ff ff ff ff  ........               299.1.24       
                                              ff ff ff ff  ff ff ff ff  ........               299.1.32       
                                              ff ff ff ff  ff ff ff ff  ........               299.1.40       
                                              ff ff ff ff  ff ff ff ff  ........               299.1.48       
                                              ff ff ff ff  ff ff ff ff  ........               299.1.56       
                                              ff ff ff ff  ff ff ff ff  ........               299.1.64       
                                              ff ff ff ff  ff ff ff ff  ........               299.1.72       
                                              ff ff ff ff  ff ff ff ff  ........               299.1.80       
                                              ff ff ff ff  ff ff ff ff  ........               299.1.88       
                                              ff ff ff ff  ff ff ff ff  ........               299.1.96       
                                              ff ff ff ff  ff ff ff ff  ........               299.1.104      
                                              ff ff ff ff  ff ff ff ff  ........               299.1.112      
                                              ff ff ff ff  ff ff ff ff  ........               299.1.120      
                                              ff ff ff ff  ff ff ff ff  ........               299.1.128      
                                              ff ff 81 f6  16           .....                  299.1.136      
  15                                1  IN     46                        F                      300.1.0        
  15                                1  IN     b9                        .                      301.1.0        
  15                                1  IN     68                        h                      302.1.0        
  15                                1  IN     00                        .                      303.1.0        
  15                                1  IN     08                        .                      304.1.0        
  15                                5  IN     02 54 00 c6  16           .T...                  305.1.0        
  15                              141  OUT    46 b9 6a 00  8b 02 01 00  F.j.....               306.1.0        
                                              5a a5 ff ff  ff ff ff ff  Z.......               306.1.8        
                                              ff ff ff ff  ff ff ff ff  ........               306.1.16       
                                              ff ff ff ff  ff ff ff ff  ........               306.1.24       
                                              ff ff ff ff  ff ff ff ff  ........               306.1.32       
                                              ff ff ff ff  ff ff ff ff  ........               306.1.40       
                                              ff ff ff ff  ff ff ff ff  ........               306.1.48       
                                              ff ff ff ff  ff ff ff ff  ........               306.1.56       
                                              ff ff ff ff  ff ff ff ff  ........               306.1.64       
                                              ff ff ff ff  ff ff ff ff  ........               306.1.72       
                                              ff ff ff ff  ff ff ff ff  ........               306.1.80       
                                              ff ff ff ff  ff ff ff ff  ........               306.1.88       
                                              ff ff ff ff  ff ff ff ff  ........               306.1.96       
                                              ff ff ff ff  ff ff ff ff  ........               306.1.104      
                                              ff ff ff ff  ff ff ff ff  ........               306.1.112      
                                              ff ff ff ff  ff ff ff ff  ........               306.1.120      
                                              ff ff ff ff  ff ff ff ff  ........               306.1.128      
                                              ff ff 81 77  16           ...w.                  306.1.136      
  15                                1  IN     46                        F                      307.1.0        
  15                                1  IN     b9                        .                      308.1.0        
  15                                1  IN     68                        h                      309.1.0        
  15                                1  IN     00                        .                      310.1.0        
  15                                1  IN     08                        .                      311.1.0        
  15                                5  IN     02 54 00 c6  16           .T...                  312.1.0        
  15                              141  OUT    46 b9 6a 00  8b 02 01 80  F.j.....               313.1.0        
                                              5a a5 ff ff  ff ff ff ff  Z.......               313.1.8        
                                              ff ff ff ff  ff ff ff ff  ........               313.1.16       
                                              ff ff ff ff  ff ff ff ff  ........               313.1.24       
                                              ff ff ff ff  ff ff ff ff  ........               313.1.32       
                                              ff ff ff ff  ff ff ff ff  ........               313.1.40       
                                              ff ff ff ff  ff ff ff ff  ........               313.1.48       
                                              ff ff ff ff  ff ff ff ff  ........               313.1.56       
                                              ff ff ff ff  ff ff ff ff  ........               313.1.64       
                                              ff ff ff ff  ff ff ff ff  ........               313.1.72       
                                              ff ff ff ff  ff ff ff ff  ........               313.1.80       
                                              ff ff ff ff  ff ff ff ff  ........               313.1.88       
                                              ff ff ff ff  ff ff ff ff  ........               313.1.96       
                                              ff ff ff ff  ff ff ff ff  ........               313.1.104      
                                              ff ff ff ff  ff ff ff ff  ........               313.1.112      
                                              ff ff ff ff  ff ff ff ff  ........               313.1.120      
                                              ff ff ff ff  ff ff ff ff  ........               313.1.128      
                                              ff ff 81 f7  16           .....                  313.1.136      
  15                                1  IN     46                        F                      314.1.0        
  15                                1  IN     b9                        .                      315.1.0        
  15                                1  IN     68                        h                      316.1.0        
  15                                1  IN     00                        .                      317.1.0        
  15                                1  IN     08                        .                      318.1.0        
  15                                5  IN     02 54 00 c6  16           .T...                  319.1.0        
  15                               77  OUT    46 b9 6a 00  4b 04 00 00  F.j.K...               320.1.0        
                                              5a a5 ff ff  ff 00 ff ff  Z.......               320.1.8        
                                              00 ff ff ff  ff ff ff ff  ........               320.1.16       
                                              ff ff ff ff  ff ff ff ff  ........               320.1.24       
                                              00 00 ff a8  ff a8 ff 90  ........               320.1.32       
                                              ff fd 03 ff  ff ff ff ff  ........               320.1.40       
                                              ff ff ff ff  ff ff ff ff  ........               320.1.48       
                                              ff ff ff ff  ff ff ff ff  ........               320.1.56       
                                              ff ec ff ff  ff 6a bf f7  .....j..               320.1.64       
                                              ba 9f 39 cc  16           ..9..                  320.1.72       
  15                                1  IN     46                        F                      321.1.0        
  15                                1  IN     b9                        .                      322.1.0        
  15                                1  IN     68                        h                      323.1.0        
  15                                1  IN     00                        .                      324.1.0        
  15                                1  IN     08                        .                      325.1.0        
  15                                5  IN     04 54 00 c8  16           .T...                  326.1.0        

根據網路上的分析,封包的傳輸流程,可以分成如下幾個步驟:

(PC Out) > Pulse 
           (7f)
(PC In)  > Infomation packet 
           (46 b9 68 00 34 50 91 11 6a 8a f7 ba 9f 00 a8 ee e0 fd 26 03 03 81 72 54 00 f5 14 04 06 70 8a 02 29 2b 2f 30 2c 00 14 10 04 e7 ec 6b bf ff ff 15 08 25 01 12 0c 16)
(PC Out) > Frequency challenges round 1
           (46 b9 6a 00 20 00 0b 00 c0 80 c0 ff c0 00 80 80 80 ff 80 00 40 80 40 ff 40 00 00 80 00 00 00 0a 12 16 fe)
(PC In)  > Frequency responses
           (46 b9 68 00 20 00 0b 0d 58 13 07 18 c0 1a 82 25 ae 30 da 36 1b 4c 55 61 db 54 c5 76 08 00 00 08 28 16)
(PC Out) > Frequency challenges round 2
           (46 b9 6a 00 20 00 0c 69 80 6a 80 6b 80 6c 80 6d 80 6e 80 64 40 65 40 66 40 67 40 68 40 69 40 0a 02 16 fe)
(PC In)  > Frequency responses
           (46 b9 68 00 20 00 0c 23 dd 23 fb 24 0f 24 32 24 4b 24 64 47 ff 48 2c 48 63 48 90 48 81 48 a4 09 24 16)
(PC Out) > Baudrate switch
           (46 b9 6a 00 0e 01 64 40 ff d0 80 6b 81 04 58 16)
(PC In)  > Ack
           (46 b9 68 00 07 01 00 70 16)
(PC Out) > Prepare
           (46 b9 6a 00 0b 05 00 00 5a a5 01 79 16)
(PC In)  > Ack
           (46 b9 68 00 07 05 00 74 16)
(PC Out) > Erase
           (46 b9 6a 00 0b 03 00 00 5a a5 01 77 16)
(PC In)  > Ack + UID
           (46 b9 68 00 0e 03 f5 14 00 d6 05 aa 28 03 2f 16)
(PC Out) > Write block 1
           (46 b9 6a 00 8b 22 00 00 5a a5 02 00 11 75 80 ff 75 90 ff 75 a0 ff e4 f5 b0 80 fe 78 7f e4 f6 d8 fd 75 81 07 02 00 03 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 74 81 16)
(PC In)  > Ack
           (46 b9 68 00 08 02 54 00 c6 16)
(PC Out) > Write block 2
           (46 b9 6a 00 8b 02 00 80 5a a5 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 81 f6 16)
(PC In)  > Ack
           (46 b9 68 00 08 02 54 00 c6 16)
(PC Out) > Write block 3
           (46 b9 6a 00 8b 02 01 00 5a a5 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 81 77 16)
(PC In)  > Ack
           (46 b9 68 00 08 02 54 00 c6 16)
(PC Out) > Write block 4
           (46 b9 6a 00 8b 02 01 80 5a a5 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 81 f7 16)
(PC In)  > Ack
           (46 b9 68 00 08 02 54 00 c6 16)
(PC Out) > Option packet
           (46 b9 6a 00 4b 04 00 00 5a a5 ff ff ff 00 ff ff 00 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 00 00 ff a8 ff a8 ff 90 ff fd 03 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ec ff ff ff 6a bf f7 ba 9f 39 cc 16)
(PC In)  > Ack
           (46 b9 68 00 08 04 54 00 c8 16)


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