1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
| import socket, sys, itertools, random, re, time, select
from hashlib import sha256
from contextlib import closing
from multiprocessing import Process, Event, Queue, cpu_count
HOST = "8.147.135.168"
PORT = 30736
N_QUERIES = 17
ROUNDS = 25
SEED_BASE = 42
READ_TIMEOUT = 7.0
WRITE_TIMEOUT = 7.0
PROMPT_TIMEOUT = 2.5
PER_Q_TIMEOUT = 3.5
LINE_MAXLEN = 32768
RECV_SOFT_LIMIT_LINES = 60
MAX_ERROR_BITS = 3
RETRY_PER_ROUND = 2
POW_WAIT_MAX = 200
VERBOSE = False
ALPHABET = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
class LineIO:
def __init__(self, sock: socket.socket):
self.sock = sock
self.buf = b""
try:
self.sock.settimeout(None)
except Exception:
pass
def writeln(self, s: str):
data = (s.rstrip("\r\n") + "\n").encode()
end = time.time() + WRITE_TIMEOUT
mv = memoryview(data)
sent = 0
while sent < len(data):
remain = end - time.time()
if remain <= 0:
raise TimeoutError("write timed out")
_, w, _ = select.select([], [self.sock], [], remain)
if not w:
continue
n = self.sock.send(mv[sent:])
if n <= 0:
raise OSError("socket closed while writing")
sent += n
def _recv_some(self, timeout: float):
if timeout is not None and timeout < 0:
timeout = 0
r, _, _ = select.select([self.sock], [], [], timeout)
if not r:
return b""
try:
return self.sock.recv(4096)
except BlockingIOError:
return b""
def readline(self, timeout: float = READ_TIMEOUT) -> str:
end = time.time() + (timeout if timeout is not None else 1e9)
while True:
pos = self.buf.find(b"\n")
if pos != -1:
line = self.buf[:pos+1]; self.buf = self.buf[pos+1:]
return line.decode(errors="ignore")
if time.time() >= end:
return ""
chunk = self._recv_some(end - time.time())
if chunk == b"":
if self.buf:
line = self.buf; self.buf = b""
return line.decode(errors="ignore")
return ""
self.buf += chunk
if len(self.buf) > LINE_MAXLEN:
line = self.buf[:LINE_MAXLEN]; self.buf = self.buf[LINE_MAXLEN:]
return line.decode(errors="ignore")
def read_until_any(self, patterns, timeout=READ_TIMEOUT, max_lines=RECV_SOFT_LIMIT_LINES):
compiled = [re.compile(p, re.I) for p in patterns]
end = time.time() + (timeout if timeout is not None else 1e9)
lines, midx = [], -1
while len(lines) < max_lines and time.time() < end:
line = self.readline(timeout=end - time.time())
if not line: break
lines.append(line)
for i, pr in enumerate(compiled):
if pr.search(line):
return "".join(lines), i
return "".join(lines), midx
def read_some_lines(self, n=1, timeout=READ_TIMEOUT):
end = time.time() + (timeout if timeout is not None else 1e9)
out = []
for _ in range(n):
if time.time() >= end: break
line = self.readline(timeout=end - time.time())
if not line: break
out.append(line)
return "".join(out)
def tcp_tune(sock: socket.socket):
try:
sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
if hasattr(socket, "TCP_KEEPIDLE"):
sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 60)
if hasattr(socket, "TCP_KEEPINTVL"):
sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, 10)
if hasattr(socket, "TCP_KEEPCNT"):
sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, 4)
except Exception:
pass
try:
sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
except Exception:
pass
def xor_two(a, b):
return "( ( {} and ( {} == 0 ) ) or ( ( {} == 0 ) and {} ) )".format(a, b, a, b)
def xor_expr_for_indices(indices):
if not indices: return "0"
expr = f"S{indices[0]}"
for idx in indices[1:]:
expr = xor_two(expr, f"S{idx}")
return expr
def rank_gf2(A):
A = [row[:] for row in A]
m = len(A); n = len(A[0]) if m else 0
r = 0
for c in range(n):
piv = None
for i in range(r, m):
if A[i][c]: piv = i; break
if piv is None: continue
A[r], A[piv] = A[piv], A[r]
for i in range(m):
if i != r and A[i][c]:
for j in range(c, n):
A[i][j] ^= A[r][j]
r += 1
if r == m: break
return r
def build_queries(n_queries, seed=None):
rnd = random.Random(seed)
rows = []
while True:
rows = []
for _ in range(8):
mask = [i for i in range(8) if rnd.choice([0,1])]
if not mask: mask = [rnd.randrange(8)]
rows.append(mask)
A = [[1 if j in row else 0 for j in range(8)] for row in rows]
if rank_gf2(A) == 8: break
while len(rows) < n_queries:
mask = [i for i in range(8) if rnd.choice([0,1])]
if not mask: mask = [rnd.randrange(8)]
rows.append(mask)
queries = [f"( {xor_expr_for_indices(mask)} ) == 1" for mask in rows]
return rows, queries
def solve_gf2(A, b):
m = len(A)
if m == 0: return [0]* (0 if len(A)==0 else len(A[0]))
n = len(A[0])
M = [row[:] + [bit] for row, bit in zip(A, b)]
r = 0; pivs = []
for c in range(n):
sel = None
for i in range(r, m):
if M[i][c] == 1: sel = i; break
if sel is None: continue
M[r], M[sel] = M[sel], M[r]
pivs.append(c)
for i in range(m):
if i != r and M[i][c] == 1:
for j in range(c, n+1):
M[i][j] ^= M[r][j]
r += 1
if r == m: break
for i in range(r, m):
if all(M[i][j]==0 for j in range(n)) and M[i][n]==1:
return None
x = [0]*n
for i, c in enumerate(pivs):
x[c] = M[i][n]
return x
def rows_to_bitmasks(rows):
masks = []
for mask_list in rows:
v = 0
for j in mask_list:
v |= (1 << j)
masks.append(v)
return masks
def predict_all(bitmasks, sol_bits):
sv = 0
for i, b in enumerate(sol_bits):
if b: sv |= (1 << i)
return [ (m & sv).bit_count() & 1 for m in bitmasks ]
def decode_from_responses(rows, responses, max_err=3):
n = len(rows)
assert len(responses) == n
A_full = [[1 if j in rows[i] else 0 for j in range(8)] for i in range(n)]
b_full = responses
bitmasks = rows_to_bitmasks(rows)
idxs = range(n)
for ecount in range(0, max_err+1):
for errs in itertools.combinations(idxs, ecount):
good = [i for i in idxs if i not in errs]
A = [A_full[i] for i in good]
b = [b_full[i] for i in good]
sol = solve_gf2(A, b)
if sol is None: continue
pred = predict_all(bitmasks, sol)
diff = [i for i in idxs if pred[i] != b_full[i]]
if set(diff) == set(errs):
return sol, errs
return None, None
def _pow_worker(prefixes, suffix, target, found_evt: Event, outq: Queue):
for a in prefixes:
if found_evt.is_set(): return
for b in ALPHABET:
for c in ALPHABET:
for d in ALPHABET:
if found_evt.is_set(): return
xxxx = f"{a}{b}{c}{d}"
if sha256((xxxx + suffix).encode()).hexdigest() == target:
outq.put(xxxx); found_evt.set(); return
def solve_pow_parallel(suffix, target):
nprocs = min(max(4, cpu_count()), 32)
chunk = (len(ALPHABET) + nprocs - 1) // nprocs
found_evt = Event(); outq = Queue(); procs = []
for i in range(nprocs):
seg = ALPHABET[i*chunk:(i+1)*chunk]
if not seg: continue
p = Process(target=_pow_worker, args=(seg, suffix, target, found_evt, outq))
p.daemon = True; p.start(); procs.append(p)
xxxx = None
deadline = time.time() + POW_WAIT_MAX
try:
while time.time() < deadline and not found_evt.is_set():
time.sleep(0.01)
if found_evt.is_set():
xxxx = outq.get_nowait()
except Exception:
pass
finally:
for p in procs: p.terminate()
for p in procs:
try: p.join(timeout=0.1)
except Exception: pass
return xxxx
RE_PR_LINE = re.compile(r"Prisoner'?s?\s+response:\s*([A-Za-z0-9_!]+)", re.I)
RE_TRUE = re.compile(r"\btrue\b", re.I)
RE_FALSE = re.compile(r"\bfalse\b", re.I)
RE_YES = re.compile(r"\byes\b|\bon\b|\b1\b", re.I)
RE_NO = re.compile(r"\bno\b|\boff\b|\b0\b", re.I)
def parse_bool(text: str) -> int:
m = RE_PR_LINE.search(text)
if m:
tok = m.group(1).lower()
if tok in ("true","t","1","yes","y","on"): return 1
if tok in ("false","f","0","no","n","off"): return 0
if tok.startswith("t"): return 1
if tok.startswith("f"): return 0
if RE_TRUE.search(text): return 1
if RE_FALSE.search(text): return 0
if RE_YES.search(text): return 1
if RE_NO.search(text): return 0
return 0
PROMPT_PATTERNS = [
r"Ask your question",
r"\byou may ask\b",
r"\bquestion\b",
r"\bquery\b",
r"\bstart\b",
r"\bS0\b",
]
SUBMIT_PATTERNS = [r"\banswer\b", r"\bsubmit\b", r"\benter\b", r"\binput\b"]
RESULT_PATTERNS = [r"correct", r"scowls", r"\bnext\b", r"\bround\b", r"gift", r"congrat", r"success"]
def complete_round(io: LineIO, round_idx: int) -> bool:
rows, queries = build_queries(N_QUERIES, seed=SEED_BASE + round_idx)
io.read_until_any(PROMPT_PATTERNS, timeout=READ_TIMEOUT, max_lines=40)
responses = []
for idx, q in enumerate(queries):
io.read_until_any(PROMPT_PATTERNS, timeout=PROMPT_TIMEOUT, max_lines=4)
io.writeln(q)
ans_blob, _ = io.read_until_any(
patterns=[r"Prisoner'?s?\s+response", r"\btrue\b", r"\bfalse\b", r"\b(?:yes|no)\b", r"\b[01]\b"],
timeout=PER_Q_TIMEOUT, max_lines=8
)
if not ans_blob:
ans_blob = io.read_some_lines(3, timeout=PER_Q_TIMEOUT)
bit = parse_bool(ans_blob)
responses.append(bit)
if VERBOSE:
print(f"[A{idx:02d}] bit={bit} | raw={ans_blob.strip()[:120]}")
sol, errs = decode_from_responses(rows, responses, max_err=MAX_ERROR_BITS)
if sol is None:
return False
io.read_until_any(SUBMIT_PATTERNS, timeout=READ_TIMEOUT, max_lines=20)
io.writeln(" ".join(str(x) for x in sol))
res, _ = io.read_until_any(RESULT_PATTERNS, timeout=READ_TIMEOUT, max_lines=40)
low = (res or "").lower()
ok = any(k in low for k in ["scowls","correct","next","round","gift","success","congrat"])
return ok
def do_pow(io: LineIO, banner: str):
m = re.search(r"sha256\(XXXX\+([^\)]+)\)\s*==\s*([0-9a-fA-F]{64})", banner)
if not m:
extra, _ = io.read_until_any([r"sha256\(XXXX\+"], timeout=READ_TIMEOUT, max_lines=40)
banner += extra
m = re.search(r"sha256\(XXXX\+([^\)]+)\)\s*==\s*([0-9a-fA-F]{64})", banner)
if not m:
return
suffix, target = m.group(1), m.group(2)
print(f"[POW] suffix={suffix} target={target}")
xxxx = solve_pow_parallel(suffix, target)
if not xxxx:
print("[POW] 并行未找到；建议提高 POW_WAIT_MAX 或换更快的机器。")
sys.exit(2)
print(f"[POW] solved: {xxxx}")
io.writeln(xxxx)
ack, _ = io.read_until_any([r"OK", r"pass", r"correct", r"success", r"failed", r"invalid"],
timeout=READ_TIMEOUT, max_lines=20)
if re.search(r"failed|invalid", ack or "", re.I):
print("[POW] 校验失败"); sys.exit(3)
def interact(host, port):
try:
socket.getaddrinfo(host, port)
except Exception:
pass
with closing(socket.create_connection((host, port), timeout=8)) as s:
try:
s.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
if hasattr(socket, "TCP_KEEPIDLE"): s.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 60)
if hasattr(socket, "TCP_KEEPINTVL"): s.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, 10)
if hasattr(socket, "TCP_KEEPCNT"): s.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, 4)
except Exception:
pass
try: s.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
except Exception: pass
io = LineIO(s)
banner = io.read_some_lines(40, timeout=READ_TIMEOUT)
if banner:
print("== banner ==\n" + banner)
do_pow(io, banner)
for r in range(ROUNDS):
attempts = 0
while True:
attempts += 1
ok = complete_round(io, r)
if ok:
if r == 9:
gift = io.read_some_lines(20, timeout=READ_TIMEOUT)
if gift.strip():
print("[Gift] " + gift.strip()[:200])
break
if attempts > (1 + RETRY_PER_ROUND):
print(f"[!] 第 {r+1} 轮失败过多，退出。")
sys.exit(4)
io.read_some_lines(40, timeout=READ_TIMEOUT)
final = io.read_some_lines(80, timeout=READ_TIMEOUT)
if final:
print("== Final ==\n" + final)
if __name__ == "__main__":
try:
interact(HOST, PORT)
except KeyboardInterrupt:
print("\n[!] 中断")
sys.exit(130)
except Exception as e:
print(f"[!] 异常：{e}")
sys.exit(1)
|
