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simple reverse proxy

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This commit is contained in:
breakwa11 2015-09-02 23:57:51 +08:00
parent 56af51b43c
commit 55d10ace01
1 changed files with 34 additions and 8 deletions
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42
shadowsocks/tcprelay.py
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@ -114,6 +114,7 @@ class TCPRelayHandler(object):
self._stage = STAGE_INIT
self._encryptor = encrypt.Encryptor(config['password'],
config['method'])
self._encrypt_correct = True
self._fastopen_connected = False
self._data_to_write_to_local = []
self._data_to_write_to_remote = []
@ -281,6 +282,31 @@ class TCPRelayHandler(object):
logging.error('write_all_to_sock:unknown socket')
return True
def _get_redirect_host(self, client_address, ogn_data):
# test
host_list = [("www.bing.com", 80), ("www.microsoft.com", 80), ("www.baidu.com", 443), ("www.qq.com", 80), ("www.csdn.net", 80), ("1.2.3.4", 1000)]
hash_code = binascii.crc32(ogn_data)
addrs = socket.getaddrinfo(client_address[0], client_address[1], 0, socket.SOCK_STREAM, socket.SOL_TCP)
af, socktype, proto, canonname, sa = addrs[0]
address_bytes = common.inet_pton(af, sa[0])
if len(address_bytes) == 16:
addr = struct.unpack('>Q', address_bytes[8:])[0]
if len(address_bytes) == 4:
addr = struct.unpack('>I', address_bytes)[0]
else:
addr = 0
return host_list[((hash_code & 0xffffffff) + addr + 3) % len(host_list)]
def _handel_protocol_error(self, client_address, ogn_data):
logging.warn("Protocol ERROR, TCP ogn data %s" % (binascii.hexlify(ogn_data), ))
self._encrypt_correct = False
#create redirect or disconnect by hash code
host, port = self._get_redirect_host(client_address, ogn_data)
data = "\x03" + chr(len(host)) + host + struct.pack('>H', port)
logging.warn("TCP data redir %s:%d %s" % (host, port, binascii.hexlify(data)))
#raise Exception('can not parse header')
return data + ogn_data
def _handle_stage_connecting(self, data):
if self._is_local:
data = self._encryptor.encrypt(data)
@ -348,16 +374,14 @@ class TCPRelayHandler(object):
before_parse_data = data
if FORCE_NEW_PROTOCOL and ord(data[0]) != 0x88:
logging.warn("TCP data %s decrypt %s" % (binascii.hexlify(ogn_data), binascii.hexlify(before_parse_data)))
raise Exception('can not parse header')
data = self._handel_protocol_error(self._client_address, ogn_data)
data = pre_parse_header(data)
if data is None:
logging.warn("TCP data %s decrypt %s" % (binascii.hexlify(ogn_data), binascii.hexlify(before_parse_data)))
raise Exception('can not parse header')
data = self._handel_protocol_error(self._client_address, ogn_data)
header_result = parse_header(data)
if header_result is None:
logging.warn("TCP data %s decrypt %s" % (binascii.hexlify(ogn_data), binascii.hexlify(before_parse_data)))
raise Exception('can not parse header')
data = self._handel_protocol_error(self._client_address, ogn_data)
header_result = parse_header(data)
connecttype, remote_addr, remote_port, header_length = header_result
logging.info('%s connecting %s:%d from %s:%d' %
((connecttype == 0) and 'TCP' or 'UDP',
@ -505,7 +529,8 @@ class TCPRelayHandler(object):
ogn_data = data
self._update_activity(len(data))
if not is_local:
data = self._encryptor.decrypt(data)
if self._encrypt_correct:
data = self._encryptor.decrypt(data)
if not data:
return
self._server.server_transfer_ul += len(data)
@ -557,7 +582,8 @@ class TCPRelayHandler(object):
if self._is_local:
data = self._encryptor.decrypt(data)
else:
data = self._encryptor.encrypt(data)
if self._encrypt_correct:
data = self._encryptor.encrypt(data)
try:
self._write_to_sock(data, self._local_sock)
except Exception as e: