implement read timeout, if server sends nothing for 1 min, connection drops

mtprotoproxy.py

@@ -139,10 +139,10 @@ def init_config():
     # use middle proxy, necessary to show ad
     conf_dict.setdefault("USE_MIDDLE_PROXY", len(conf_dict["AD_TAG"]) == 16)
 
-    # if IPv6 avaliable, use it by default
+    # if IPv6 available, use it by default, IPv6 with middle proxies is unstable now
-    conf_dict.setdefault("PREFER_IPV6", socket.has_ipv6)
+    conf_dict.setdefault("PREFER_IPV6", socket.has_ipv6 and not conf_dict["USE_MIDDLE_PROXY"])
 
-    # disables tg->client trafic reencryption, faster but less secure
+    # disables tg->client traffic reencryption, faster but less secure
     conf_dict.setdefault("FAST_MODE", True)
 
     # enables some working modes
@@ -264,6 +264,9 @@ def init_config():
     # telegram servers connect timeout in seconds
     conf_dict.setdefault("TG_CONNECT_TIMEOUT", 10)
 
+    # drop connection if no data from telegram server for this many seconds
+    conf_dict.setdefault("TG_READ_TIMEOUT", 60)
+
     # listen address for IPv4
     conf_dict.setdefault("LISTEN_ADDR_IPV4", "0.0.0.0")
 
@@ -483,7 +486,7 @@ myrandom = MyRandom()
 
 
 class TgConnectionPool:
-    MAX_CONNS_IN_POOL = 64
+    MAX_CONNS_IN_POOL = 16
 
     def __init__(self):
         self.pools = {}
@@ -500,6 +503,16 @@ class TgConnectionPool:
                                           timeout=config.TG_CONNECT_TIMEOUT)
         return reader_tgt, writer_tgt
 
+    def is_conn_dead(self, reader, writer):
+        if writer.transport.is_closing():
+            return True
+        raw_reader = reader
+        while hasattr(raw_reader, 'upstream'):
+            raw_reader = raw_reader.upstream
+        if raw_reader.at_eof():
+            return True
+        return False
+
     def register_host_port(self, host, port, init_func):
         if (host, port, init_func) not in self.pools:
             self.pools[(host, port, init_func)] = []
@@ -512,15 +525,16 @@ class TgConnectionPool:
         self.register_host_port(host, port, init_func)
 
         ret = None
-        for task in self.pools[(host, port, init_func)][::]:
+        for task in self.pools[(host, port, init_func)][:]:
             if task.done():
                 if task.exception():
                     self.pools[(host, port, init_func)].remove(task)
                     continue
 
                 reader, writer, *other = task.result()
-                if writer.transport.is_closing():
+                if self.is_conn_dead(reader, writer):
                     self.pools[(host, port, init_func)].remove(task)
+                    writer.transport.abort()
                     continue
 
                 if not ret:
@@ -778,7 +792,7 @@ class MTProtoCompactFrameStreamWriter(LayeredStreamWriterBase):
 
     def write(self, data, extra={}):
         SMALL_PKT_BORDER = 0x7f
-        LARGE_PKT_BORGER = 256 ** 3
+        LARGE_PKT_BORDER = 256 ** 3
 
         if len(data) % 4 != 0:
             print_err("BUG: MTProtoFrameStreamWriter attempted to send msg with len", len(data))
@@ -791,7 +805,7 @@ class MTProtoCompactFrameStreamWriter(LayeredStreamWriterBase):
 
         if len_div_four < SMALL_PKT_BORDER:
             return self.upstream.write(bytes([len_div_four]) + data)
-        elif len_div_four < LARGE_PKT_BORGER:
+        elif len_div_four < LARGE_PKT_BORDER:
             return self.upstream.write(b'\x7f' + int.to_bytes(len_div_four, 3, 'little') + data)
         else:
             print_err("Attempted to send too large pkt len =", len(data))
@@ -1573,7 +1587,11 @@ async def do_middleproxy_handshake(proto_tag, dc_idx, cl_ip, cl_port):
 async def tg_connect_reader_to_writer(rd, wr, user, rd_buf_size, is_upstream):
     try:
         while True:
-            data = await rd.read(rd_buf_size)
+            if not is_upstream:
+                data = await asyncio.wait_for(rd.read(rd_buf_size),
+                                              timeout=config.TG_READ_TIMEOUT)
+            else:
+                data = await rd.read(rd_buf_size)
             if isinstance(data, tuple):
                 data, extra = data
             else:
@@ -1594,7 +1612,7 @@ async def tg_connect_reader_to_writer(rd, wr, user, rd_buf_size, is_upstream):
 
                 wr.write(data, extra)
                 await wr.drain()
-    except (OSError, asyncio.IncompleteReadError) as e:
+    except (OSError, asyncio.IncompleteReadError, asyncio.TimeoutError) as e:
         # print_err(e)
         pass
 
@@ -2000,7 +2018,8 @@ async def get_srv_time():
                     continue
                 line = line[len("Date: "):].decode()
                 srv_time = datetime.datetime.strptime(line, "%a, %d %b %Y %H:%M:%S %Z")
-                now_time = datetime.datetime.utcnow()
+                srv_time = srv_time.replace(tzinfo=datetime.timezone.utc)
+                now_time = datetime.datetime.now(datetime.timezone.utc)
                 is_time_skewed = (now_time-srv_time).total_seconds() > MAX_TIME_SKEW
                 if is_time_skewed and config.USE_MIDDLE_PROXY and not disable_middle_proxy:
                     print_err("Time skew detected, please set the clock")
@@ -2146,15 +2165,15 @@ def print_tg_info():
         for ip in ip_addrs:
             if config.MODES["classic"]:
                 params = {"server": ip, "port": config.PORT, "secret": secret}
-                params_encodeded = urllib.parse.urlencode(params, safe=':')
+                params_encoded = urllib.parse.urlencode(params, safe=':')
-                classic_link = "tg://proxy?{}".format(params_encodeded)
+                classic_link = "tg://proxy?{}".format(params_encoded)
                 proxy_links.append({"user": user, "link": classic_link})
                 print("{}: {}".format(user, classic_link), flush=True)
 
             if config.MODES["secure"]:
                 params = {"server": ip, "port": config.PORT, "secret": "dd" + secret}
-                params_encodeded = urllib.parse.urlencode(params, safe=':')
+                params_encoded = urllib.parse.urlencode(params, safe=':')
-                dd_link = "tg://proxy?{}".format(params_encodeded)
+                dd_link = "tg://proxy?{}".format(params_encoded)
                 proxy_links.append({"user": user, "link": dd_link})
                 print("{}: {}".format(user, dd_link), flush=True)
 
@@ -2164,8 +2183,8 @@ def print_tg_info():
                 # tls_secret = bytes.fromhex("ee" + secret) + config.TLS_DOMAIN.encode()
                 # tls_secret_base64 = base64.urlsafe_b64encode(tls_secret)
                 params = {"server": ip, "port": config.PORT, "secret": tls_secret}
-                params_encodeded = urllib.parse.urlencode(params, safe=':')
+                params_encoded = urllib.parse.urlencode(params, safe=':')
-                tls_link = "tg://proxy?{}".format(params_encodeded)
+                tls_link = "tg://proxy?{}".format(params_encoded)
                 proxy_links.append({"user": user, "link": tls_link})
                 print("{}: {}".format(user, tls_link), flush=True)