<s> import time <EOL> import socket <EOL> import struct <EOL> import errno <EOL> import logging <EOL> from shadowsocks import eventloop , asyncdns , lru_cache , encrypt <EOL> from shadowsocks import utils as shadowsocks_utils <EOL> from shadowsocks . common import parse_header <EOL> BUF_SIZE = <NUM_LIT> <EOL> CACHE_TIMEOUT = <NUM_LIT:10> <EOL> class DNSRelay ( object ) : <EOL> def __init__ ( self , config ) : <EOL> self . _loop = None <EOL> self . _config = config <EOL> self . _last_time = time . time ( ) <EOL> self . _local_addr = ( config [ '<STR_LIT>' ] , <NUM_LIT> ) <EOL> self . _remote_addr = ( config [ '<STR_LIT>' ] , config [ '<STR_LIT>' ] ) <EOL> dns_addr = config [ '<STR_LIT>' ] <EOL> addrs = socket . getaddrinfo ( dns_addr , <NUM_LIT> , <NUM_LIT:0> , <EOL> socket . SOCK_DGRAM , socket . SOL_UDP ) <EOL> if not addrs : <EOL> raise Exception ( "<STR_LIT>" ) <EOL> af , socktype , proto , canonname , sa = addrs [ <NUM_LIT:0> ] <EOL> dns_port = struct . pack ( '<STR_LIT>' , <NUM_LIT> ) <EOL> if af == socket . AF_INET : <EOL> self . _address_to_send = '<STR_LIT>' + socket . inet_aton ( sa [ <NUM_LIT:0> ] ) + dns_port <EOL> else : <EOL> self . _address_to_send = '<STR_LIT>' + socket . inet_pton ( af , sa [ <NUM_LIT:0> ] ) + dns_port <EOL> def add_to_loop ( self , loop ) : <EOL> if self . _loop : <EOL> raise Exception ( '<STR_LIT>' ) <EOL> self . _loop = loop <EOL> loop . add_handler ( self . handle_events ) <EOL> def handle_events ( self , events ) : <EOL> pass <EOL> class UDPDNSRelay ( DNSRelay ) : <EOL> def __init__ ( self , config ) : <EOL> DNSRelay . __init__ ( self , config ) <EOL> self . _id_to_addr = lru_cache . LRUCache ( CACHE_TIMEOUT ) <EOL> self . _local_sock = None <EOL> self . _remote_sock = None <EOL> sockets = [ ] <EOL> for addr in ( self . _local_addr , self . _remote_addr ) : <EOL> addrs = socket . getaddrinfo ( addr [ <NUM_LIT:0> ] , addr [ <NUM_LIT:1> ] , <NUM_LIT:0> , <EOL> socket . SOCK_DGRAM , socket . SOL_UDP ) <EOL> if len ( addrs ) == <NUM_LIT:0> : <EOL> raise Exception ( "<STR_LIT>" % addr ) <EOL> af , socktype , proto , canonname , sa = addrs [ <NUM_LIT:0> ] <EOL> sock = socket . socket ( af , socktype , proto ) <EOL> sock . setblocking ( False ) <EOL> sockets . append ( sock ) <EOL> self . _local_sock , self . _remote_sock = sockets <EOL> self . _local_sock . bind ( self . _local_addr ) <EOL> def add_to_loop ( self , loop ) : <EOL> DNSRelay . add_to_loop ( self , loop ) <EOL> loop . add ( self . _local_sock , eventloop . POLL_IN ) <EOL> loop . add ( self . _remote_sock , eventloop . POLL_IN ) <EOL> def _handle_local ( self , sock ) : <EOL> data , addr = sock . recvfrom ( BUF_SIZE ) <EOL> header = asyncdns . parse_header ( data ) <EOL> if header : <EOL> try : <EOL> req_id = header [ <NUM_LIT:0> ] <EOL> req = asyncdns . parse_response ( data ) <EOL> self . _id_to_addr [ req_id ] = addr <EOL> data = self . _address_to_send + data <EOL> data = encrypt . encrypt_all ( self . _config [ '<STR_LIT:password>' ] , <EOL> self . _config [ '<STR_LIT>' ] , <NUM_LIT:1> , data ) <EOL> self . _remote_sock . sendto ( data , self . _remote_addr ) <EOL> logging . info ( '<STR_LIT>' , req . hostname ) <EOL> except Exception as e : <EOL> import traceback <EOL> traceback . print_exc ( ) <EOL> logging . error ( e ) <EOL> def _handle_remote ( self , sock ) : <EOL> data , addr = sock . recvfrom ( BUF_SIZE ) <EOL> if data : <EOL> try : <EOL> data = encrypt . encrypt_all ( self . _config [ '<STR_LIT:password>' ] , <EOL> self . _config [ '<STR_LIT>' ] , <NUM_LIT:0> , data ) <EOL> header_result = parse_header ( data ) <EOL> if header_result is None : <EOL> return None , None <EOL> addrtype , dest_addr , dest_port , header_length = header_result <EOL> data = data [ header_length : ] <EOL> header = asyncdns . parse_header ( data ) <EOL> if header : <EOL> req_id = header [ <NUM_LIT:0> ] <EOL> res = asyncdns . parse_response ( data ) <EOL> addr = self . _id_to_addr . get ( req_id , None ) <EOL> if addr : <EOL> self . _local_sock . sendto ( data , addr ) <EOL> del self . _id_to_addr [ req_id ] <EOL> logging . info ( '<STR_LIT>' , res ) <EOL> except Exception as e : <EOL> import traceback <EOL> traceback . print_exc ( ) <EOL> logging . error ( e ) <EOL> def handle_events ( self , events ) : <EOL> for sock , fd , event in events : <EOL> if sock == self . _local_sock : <EOL> self . _handle_local ( sock ) <EOL> elif sock == self . _remote_sock : <EOL> self . _handle_remote ( sock ) <EOL> now = time . time ( ) <EOL> if now - self . _last_time > CACHE_TIMEOUT / <NUM_LIT:2> : <EOL> self . _id_to_addr . sweep ( ) <EOL> class TCPDNSRelay ( DNSRelay ) : <EOL> def __init__ ( self , config ) : <EOL> DNSRelay . __init__ ( self , config ) <EOL> self . _local_to_remote = { } <EOL> self . _remote_to_local = { } <EOL> self . _local_to_encryptor = { } <EOL> addrs = socket . getaddrinfo ( self . _local_addr [ <NUM_LIT:0> ] , self . _local_addr [ <NUM_LIT:1> ] , <NUM_LIT:0> , <EOL> socket . SOCK_STREAM , socket . SOL_TCP ) <EOL> if len ( addrs ) == <NUM_LIT:0> : <EOL> raise Exception ( "<STR_LIT>" % self . _local_addr ) <EOL> af , socktype , proto , canonname , sa = addrs [ <NUM_LIT:0> ] <EOL> self . _listen_sock = socket . socket ( af , socktype , proto ) <EOL> self . _listen_sock . setblocking ( False ) <EOL> self . _listen_sock . setsockopt ( socket . SOL_SOCKET , socket . SO_REUSEADDR , <NUM_LIT:1> ) <EOL> self . _listen_sock . bind ( self . _local_addr ) <EOL> self . _listen_sock . listen ( <NUM_LIT> ) <EOL> def _handle_conn ( self , sock ) : <EOL> try : <EOL> local , addr = sock . accept ( ) <EOL> addrs = socket . getaddrinfo ( self . _remote_addr [ <NUM_LIT:0> ] , <EOL> self . _remote_addr [ <NUM_LIT:1> ] , <NUM_LIT:0> , <EOL> socket . SOCK_STREAM , socket . SOL_TCP ) <EOL> if len ( addrs ) == <NUM_LIT:0> : <EOL> raise Exception ( "<STR_LIT>" % <EOL> self . _remote_addr ) <EOL> af , socktype , proto , canonname , sa = addrs [ <NUM_LIT:0> ] <EOL> remote = socket . socket ( af , socktype , proto ) <EOL> local . setsockopt ( socket . SOL_TCP , socket . TCP_NODELAY , <NUM_LIT:1> ) <EOL> remote . setsockopt ( socket . SOL_TCP , socket . TCP_NODELAY , <NUM_LIT:1> ) <EOL> self . _local_to_remote [ local ] = remote <EOL> self . _remote_to_local [ remote ] = local <EOL> self . _loop . add ( local , <NUM_LIT:0> ) <EOL> self . _loop . add ( remote , eventloop . POLL_OUT ) <EOL> try : <EOL> remote . connect ( self . _remote_addr ) <EOL> except ( OSError , IOError ) as e : <EOL> if eventloop . errno_from_exception ( e ) in ( errno . EINPROGRESS , <EOL> errno . EAGAIN ) : <EOL> pass <EOL> else : <EOL> raise <EOL> except ( OSError , IOError ) as e : <EOL> logging . error ( e ) <EOL> def _destroy ( self , local , remote ) : <EOL> if local in self . _local_to_remote : <EOL> self . _loop . remove ( local ) <EOL> self . _loop . remove ( remote ) <EOL> del self . _local_to_remote [ local ] <EOL> del self . _remote_to_local [ remote ] <EOL> if local in self . _local_to_encryptor : <EOL> del self . _local_to_encryptor [ local ] <EOL> local . close ( ) <EOL> remote . close ( ) <EOL> else : <EOL> logging . error ( '<STR_LIT>' ) <EOL> def _handle_local ( self , local , event ) : <EOL> remote = self . _local_to_remote [ local ] <EOL> encryptor = self . _local_to_encryptor . get ( local , None ) <EOL> if event & eventloop . POLL_ERR : <EOL> self . _destroy ( local , remote ) <EOL> elif event & eventloop . POLL_IN : <EOL> try : <EOL> data = local . recv ( BUF_SIZE ) <EOL> if not data : <EOL> self . _destroy ( local , remote ) <EOL> else : <EOL> if not encryptor : <EOL> try : <EOL> req = asyncdns . parse_response ( data [ <NUM_LIT:2> : ] ) <EOL> if req : <EOL> logging . info ( '<STR_LIT>' , req . hostname ) <EOL> except Exception as e : <EOL> logging . error ( e ) <EOL> encryptor = encrypt . Encryptor ( self . _config [ '<STR_LIT:password>' ] , <EOL> self . _config [ '<STR_LIT>' ] ) <EOL> self . _local_to_encryptor [ local ] = encryptor <EOL> data = self . _address_to_send + data <EOL> data = encryptor . encrypt ( data ) <EOL> remote . send ( data ) <EOL> except ( OSError , IOError ) as e : <EOL> self . _destroy ( local , self . _local_to_remote [ local ] ) <EOL> logging . error ( e ) <EOL> def _handle_remote ( self , remote , event ) : <EOL> local = self . _remote_to_local [ remote ] <EOL> if event & eventloop . POLL_ERR : <EOL> self . _destroy ( local , remote ) <EOL> elif event & eventloop . POLL_OUT : <EOL> self . _loop . modify ( remote , eventloop . POLL_IN ) <EOL> self . _loop . modify ( local , eventloop . POLL_IN ) <EOL> elif event & eventloop . POLL_IN : <EOL> try : <EOL> data = remote . recv ( BUF_SIZE ) <EOL> if not data : <EOL> self . _destroy ( local , remote ) <EOL> else : <EOL> encryptor = self . _local_to_encryptor [ local ] <EOL> data = encryptor . decrypt ( data ) <EOL> try : <EOL> res = asyncdns . parse_response ( data [ <NUM_LIT:2> : ] ) <EOL> if res : <EOL> logging . info ( '<STR_LIT>' , res ) <EOL> except Exception as e : <EOL> logging . error ( e ) <EOL> local . send ( data ) <EOL> except ( OSError , IOError ) as e : <EOL> self . _destroy ( local , remote ) <EOL> logging . error ( e ) <EOL> def add_to_loop ( self , loop ) : <EOL> DNSRelay . add_to_loop ( self , loop ) <EOL> loop . add ( self . _listen_sock , eventloop . POLL_IN ) <EOL> def handle_events ( self , events ) : <EOL> for sock , fd , event in events : <EOL> if sock == self . _listen_sock : <EOL> self . _handle_conn ( sock ) <EOL> elif sock in self . _local_to_remote : <EOL> self . _handle_local ( sock , event ) <EOL> elif sock in self . _remote_to_local : <EOL> self . _handle_remote ( sock , event ) <EOL> def main ( ) : <EOL> shadowsocks_utils . check_python ( ) <EOL> config = shadowsocks_utils . get_config ( True ) <EOL> encrypt . init_table ( config [ '<STR_LIT:password>' ] , config [ '<STR_LIT>' ] ) <EOL> logging . info ( "<STR_LIT>" % ( config [ '<STR_LIT>' ] , <NUM_LIT> ) ) <EOL> config [ '<STR_LIT>' ] = config . get ( '<STR_LIT>' , '<STR_LIT>' ) <EOL> loop = eventloop . EventLoop ( ) <EOL> udprelay = UDPDNSRelay ( config ) <EOL> udprelay . add_to_loop ( loop ) <EOL> tcprelay = TCPDNSRelay ( config ) <EOL> tcprelay . add_to_loop ( loop ) <EOL> loop . run ( ) <EOL> if __name__ == '<STR_LIT:__main__>' : <EOL> main ( ) </s>
