Rating:
The hint makes the objective clear: the provided file is a binary dump of some device in /dev/input. This data has a [fixed format](https://github.com/torvalds/linux/blob/v5.5-rc5/include/uapi/linux/input.h#L28). The parsed file shows many EV_KEY events, which hints that the device is a keyboard. Extracting the pressed keys gives the flag.
```
#!/usr/bin/python
# script built on https://stackoverflow.com/a/16682549
import struct
import time
import sys
infile_path = "DeveloperInput"
"""
FORMAT represents the format used by linux kernel input event struct
See https://github.com/torvalds/linux/blob/v5.5-rc5/include/uapi/linux/input.h#L28
Stands for: long int, long int, unsigned short, unsigned short, unsigned int
"""
FORMAT = 'llHHI'
EVENT_SIZE = struct.calcsize(FORMAT)
#open file in binary mode
in_file = open(infile_path, "rb")
event = in_file.read(EVENT_SIZE)
keymap = {
0: "KEY_RESERVED",
1: "KEY_ESC",
2: "KEY_1",
3: "KEY_2",
4: "KEY_3",
5: "KEY_4",
6: "KEY_5",
7: "KEY_6",
8: "KEY_7",
9: "KEY_8",
10: "KEY_9",
11: "KEY_0",
12: "KEY_MINUS",
13: "KEY_EQUAL",
14: "KEY_BACKSPACE",
15: "KEY_TAB",
16: "KEY_Q",
17: "KEY_W",
18: "KEY_E",
19: "KEY_R",
20: "KEY_T",
21: "KEY_Y",
22: "KEY_U",
23: "KEY_I",
24: "KEY_O",
25: "KEY_P",
26: "KEY_LEFTBRACE",
27: "KEY_RIGHTBRACE",
28: "KEY_ENTER",
29: "KEY_LEFTCTRL",
30: "KEY_A",
31: "KEY_S",
32: "KEY_D",
33: "KEY_F",
34: "KEY_G",
35: "KEY_H",
36: "KEY_J",
37: "KEY_K",
38: "KEY_L",
39: "KEY_SEMICOLON",
40: "KEY_APOSTROPHE",
41: "KEY_GRAVE",
42: "KEY_LEFTSHIFT",
43: "KEY_BACKSLASH",
44: "KEY_Z",
45: "KEY_X",
46: "KEY_C",
47: "KEY_V",
48: "KEY_B",
49: "KEY_N",
50: "KEY_M",
51: "KEY_COMMA",
52: "KEY_DOT",
53: "KEY_SLASH",
54: "KEY_RIGHTSHIFT",
55: "KEY_KPASTERISK",
56: "KEY_LEFTALT",
57: "KEY_SPACE",
58: "KEY_CAPSLOCK",
59: "KEY_F1",
60: "KEY_F2",
61: "KEY_F3",
62: "KEY_F4",
63: "KEY_F5",
64: "KEY_F6",
65: "KEY_F7",
66: "KEY_F8",
67: "KEY_F9",
68: "KEY_F10",
69: "KEY_NUMLOCK",
70: "KEY_SCROLLLOCK",
71: "KEY_KP7",
72: "KEY_KP8",
73: "KEY_KP9",
74: "KEY_KPMINUS",
75: "KEY_KP4",
76: "KEY_KP5",
77: "KEY_KP6",
78: "KEY_KPPLUS",
79: "KEY_KP1",
80: "KEY_KP2",
81: "KEY_KP3",
82: "KEY_KP0",
83: "KEY_KPDOT",
85: "KEY_ZENKAKUHANKAKU",
86: "KEY_102ND",
87: "KEY_F11",
88: "KEY_F12",
89: "KEY_RO",
90: "KEY_KATAKANA",
91: "KEY_HIRAGANA",
92: "KEY_HENKAN",
93: "KEY_KATAKANAHIRAGANA",
94: "KEY_MUHENKAN",
95: "KEY_KPJPCOMMA",
96: "KEY_KPENTER",
97: "KEY_RIGHTCTRL",
98: "KEY_KPSLASH",
99: "KEY_SYSRQ",
100: "KEY_RIGHTALT",
101: "KEY_LINEFEED",
102: "KEY_HOME",
103: "KEY_UP",
104: "KEY_PAGEUP",
105: "KEY_LEFT",
106: "KEY_RIGHT",
107: "KEY_END",
108: "KEY_DOWN",
109: "KEY_PAGEDOWN",
110: "KEY_INSERT",
111: "KEY_DELETE",
112: "KEY_MACRO",
113: "KEY_MUTE",
114: "KEY_VOLUMEDOWN",
115: "KEY_VOLUMEUP",
116: "KEY_POWER",
117: "KEY_KPEQUAL",
118: "KEY_KPPLUSMINUS",
119: "KEY_PAUSE",
120: "KEY_SCALE",
121: "KEY_KPCOMMA",
122: "KEY_HANGEUL",
122: "KEY_HANGUEL",
123: "KEY_HANJA",
124: "KEY_YEN",
125: "KEY_LEFTMETA",
126: "KEY_RIGHTMETA",
127: "KEY_COMPOSE",
128: "KEY_STOP",
129: "KEY_AGAIN",
130: "KEY_PROPS",
131: "KEY_UNDO",
132: "KEY_FRONT",
133: "KEY_COPY",
134: "KEY_OPEN",
135: "KEY_PASTE",
136: "KEY_FIND",
137: "KEY_CUT",
138: "KEY_HELP",
139: "KEY_MENU",
140: "KEY_CALC",
141: "KEY_SETUP",
142: "KEY_SLEEP",
143: "KEY_WAKEUP",
144: "KEY_FILE",
145: "KEY_SENDFILE",
146: "KEY_DELETEFILE",
147: "KEY_XFER",
148: "KEY_PROG1",
149: "KEY_PROG2",
150: "KEY_WWW",
151: "KEY_MSDOS",
152: "KEY_COFFEE",
152: "KEY_SCREENLOCK",
153: "KEY_ROTATE_DISPLAY",
153: "KEY_DIRECTION",
154: "KEY_CYCLEWINDOWS",
155: "KEY_MAIL",
156: "KEY_BOOKMARKS",
157: "KEY_COMPUTER",
158: "KEY_BACK",
159: "KEY_FORWARD",
160: "KEY_CLOSECD",
161: "KEY_EJECTCD",
162: "KEY_EJECTCLOSECD",
163: "KEY_NEXTSONG",
164: "KEY_PLAYPAUSE",
165: "KEY_PREVIOUSSONG",
166: "KEY_STOPCD",
167: "KEY_RECORD",
168: "KEY_REWIND",
169: "KEY_PHONE",
170: "KEY_ISO",
171: "KEY_CONFIG",
172: "KEY_HOMEPAGE",
173: "KEY_REFRESH",
174: "KEY_EXIT",
175: "KEY_MOVE",
176: "KEY_EDIT",
177: "KEY_SCROLLUP",
178: "KEY_SCROLLDOWN",
179: "KEY_KPLEFTPAREN",
180: "KEY_KPRIGHTPAREN",
181: "KEY_NEW",
182: "KEY_REDO",
183: "KEY_F13",
184: "KEY_F14",
185: "KEY_F15",
186: "KEY_F16",
187: "KEY_F17",
188: "KEY_F18",
189: "KEY_F19",
190: "KEY_F20",
191: "KEY_F21",
192: "KEY_F22",
193: "KEY_F23",
194: "KEY_F24",
200: "KEY_PLAYCD",
201: "KEY_PAUSECD",
202: "KEY_PROG3",
203: "KEY_PROG4",
204: "KEY_DASHBOARD",
205: "KEY_SUSPEND",
206: "KEY_CLOSE",
207: "KEY_PLAY",
208: "KEY_FASTFORWARD",
209: "KEY_BASSBOOST",
210: "KEY_PRINT",
211: "KEY_HP",
212: "KEY_CAMERA",
213: "KEY_SOUND",
214: "KEY_QUESTION",
215: "KEY_EMAIL",
216: "KEY_CHAT",
217: "KEY_SEARCH",
218: "KEY_CONNECT",
219: "KEY_FINANCE",
220: "KEY_SPORT",
221: "KEY_SHOP",
222: "KEY_ALTERASE",
223: "KEY_CANCEL",
224: "KEY_BRIGHTNESSDOWN",
225: "KEY_BRIGHTNESSUP",
226: "KEY_MEDIA",
227: "KEY_SWITCHVIDEOMODE",
228: "KEY_KBDILLUMTOGGLE",
229: "KEY_KBDILLUMDOWN",
230: "KEY_KBDILLUMUP",
231: "KEY_SEND",
232: "KEY_REPLY",
233: "KEY_FORWARDMAIL",
234: "KEY_SAVE",
235: "KEY_DOCUMENTS",
236: "KEY_BATTERY",
237: "KEY_BLUETOOTH",
238: "KEY_WLAN",
239: "KEY_UWB",
240: "KEY_UNKNOWN",
241: "KEY_VIDEO_NEXT",
242: "KEY_VIDEO_PREV",
243: "KEY_BRIGHTNESS_CYCLE",
244: "KEY_BRIGHTNESS_AUTO",
244: "KEY_BRIGHTNESS_ZERO",
245: "KEY_DISPLAY_OFF",
246: "KEY_WWAN",
246: "KEY_WIMAX",
247: "KEY_RFKILL",
248: "KEY_MICMUTE"
}
shift = False
while event:
(tv_sec, tv_usec, type, code, value) = struct.unpack(FORMAT, event)
if type != 0 or code != 0 or value != 0:
# print(f'{tv_sec}.{tv_usec}, {type}, {code}, {value}, {value:08b}')
if type == 0x01: # EV_KEY
key = keymap[code]
if value == 1:
key_label = key[4:]
if len(key_label) == 1:
if shift:
sys.stdout.write(key_label.upper())
else:
sys.stdout.write(key_label.lower())
elif "SHIFT" in key:
shift = True
elif key_label == "LEFTBRACE":
sys.stdout.write("{")
elif key_label == "RIGHTBRACE":
sys.stdout.write("}")
else:
print(key_label)
else:
if "SHIFT" in key:
shift = False
event = in_file.read(EVENT_SIZE)
in_file.close()
```
