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merge using intermediate protocol for middle proxy

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This commit is contained in:
Alexander Bersenev
2018-06-18 01:35:01 +05:00
parent 0724f1403f
commit a6e39a66d1
1 changed files with 41 additions and 14 deletions
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55
mtprotoproxy.py
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@@ -314,16 +314,12 @@ class MTProtoCompactFrameStreamReader(LayeredStreamReaderBase):
class MTProtoCompactFrameStreamWriter(LayeredStreamWriterBase):
def __init__(self, upstream, seq_no=0):
self.upstream = upstream
self.seq_no = seq_no
def write(self, data):
SMALL_PKT_BORDER = 0x7f
LARGE_PKT_BORGER = 256 ** 3
if len(data) % 4 != 0:
print_err("BUG: MTProtoFrameStreamWriter attempted to send msg with len %d" % len(data))
print_err("BUG: MTProtoFrameStreamWriter attempted to send msg with len", len(data))
return 0
len_div_four = len(data) // 4
@@ -338,6 +334,24 @@ class MTProtoCompactFrameStreamWriter(LayeredStreamWriterBase):
return 0
class MTProtoIntermediateFrameStreamReader(LayeredStreamReaderBase):
async def read(self, buf_size):
msg_len_bytes = await self.upstream.readexactly(4)
msg_len = int.from_bytes(msg_len_bytes, "little")
if msg_len > 0x80000000:
msg_len -= 0x80000000
data = await self.upstream.readexactly(msg_len)
return data
class MTProtoIntermediateFrameStreamWriter(LayeredStreamWriterBase):
def write(self, data):
return self.upstream.write(int.to_bytes(len(data), 4, 'little') + data)
class ProxyReqStreamReader(LayeredStreamReaderBase):
async def read(self, msg):
RPC_PROXY_ANS = b"\x0d\xda\x03\x44"
@@ -360,7 +374,7 @@ class ProxyReqStreamReader(LayeredStreamReaderBase):
class ProxyReqStreamWriter(LayeredStreamWriterBase):
def __init__(self, upstream, cl_ip, cl_port, my_ip, my_port):
def __init__(self, upstream, cl_ip, cl_port, my_ip, my_port, proto_tag):
self.upstream = upstream
if ":" not in cl_ip:
@@ -378,6 +392,13 @@ class ProxyReqStreamWriter(LayeredStreamWriterBase):
self.our_ip_port += int.to_bytes(my_port, 4, "little")
self.out_conn_id = bytearray([random.randrange(0, 256) for i in range(8)])
if proto_tag == PROTO_TAG_ABRIDGED:
self.last_flag_byte = b"\x40"
elif proto_tag == PROTO_TAG_INTERMEDIATE:
self.last_flag_byte = b"\x20"
else:
self.last_flag_byte = b"\x00"
def write(self, msg):
RPC_PROXY_REQ = b"\xee\xf1\xce\x36"
EXTRA_SIZE = b"\x18\x00\x00\x00"
@@ -389,12 +410,12 @@ class ProxyReqStreamWriter(LayeredStreamWriterBase):
return 0
if msg.startswith(b"\x00" * 8):
FLAGS = b"\x0a\x10\x02\x40"
flags = b"\x0a\x10\x02" + self.last_flag_byte
else:
FLAGS = b"\x08\x10\x02\x40"
flags = b"\x08\x10\x02" + self.last_flag_byte
full_msg = bytearray()
full_msg += RPC_PROXY_REQ + FLAGS + self.out_conn_id
full_msg += RPC_PROXY_REQ + flags + self.out_conn_id
full_msg += self.remote_ip_port + self.our_ip_port + EXTRA_SIZE + PROXY_TAG
full_msg += bytes([len(AD_TAG)]) + AD_TAG + FOUR_BYTES_ALIGNER
full_msg += msg
@@ -537,7 +558,7 @@ def set_bufsizes(sock, recv_buf=READ_BUF_SIZE, send_buf=WRITE_BUF_SIZE):
sock.setsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF, send_buf)
async def do_middleproxy_handshake(dc_idx, cl_ip, cl_port):
async def do_middleproxy_handshake(proto_tag, dc_idx, cl_ip, cl_port):
START_SEQ_NO = -2
NONCE_LEN = 16
@@ -662,7 +683,7 @@ async def do_middleproxy_handshake(dc_idx, cl_ip, cl_port):
if handshake_type != RPC_HANDSHAKE or handshake_peer_pid != SENDER_PID:
return False
writer_tgt = ProxyReqStreamWriter(writer_tgt, cl_ip, cl_port, my_ip, my_port)
writer_tgt = ProxyReqStreamWriter(writer_tgt, cl_ip, cl_port, my_ip, my_port, proto_tag)
reader_tgt = ProxyReqStreamReader(reader_tgt)
return reader_tgt, writer_tgt
@@ -688,7 +709,7 @@ async def handle_client(reader_clt, writer_clt):
tg_data = await do_direct_handshake(proto_tag, dc_idx)
else:
cl_ip, cl_port = writer_clt.upstream.get_extra_info('peername')[:2]
tg_data = await do_middleproxy_handshake(dc_idx, cl_ip, cl_port)
tg_data = await do_middleproxy_handshake(proto_tag, dc_idx, cl_ip, cl_port)
if not tg_data:
writer_clt.transport.abort()
@@ -709,8 +730,14 @@ async def handle_client(reader_clt, writer_clt):
writer_clt.encryptor = FakeEncryptor()
if USE_MIDDLE_PROXY:
reader_clt = MTProtoCompactFrameStreamReader(reader_clt)
writer_clt = MTProtoCompactFrameStreamWriter(writer_clt)
if proto_tag == PROTO_TAG_ABRIDGED:
reader_clt = MTProtoCompactFrameStreamReader(reader_clt)
writer_clt = MTProtoCompactFrameStreamWriter(writer_clt)
elif proto_tag == PROTO_TAG_INTERMEDIATE:
reader_clt = MTProtoIntermediateFrameStreamReader(reader_clt)
writer_clt = MTProtoIntermediateFrameStreamWriter(writer_clt)
else:
return
async def connect_reader_to_writer(rd, wr, user):
update_stats(user, curr_connects_x2=1)