def get_host_from_http_header(self, buf):
ret_buf = b''
lines = buf.split(b'\r\n')
if lines and len(lines) > 1:
for line in lines:
if match_begin(line, b"Host: "):
return common.to_str(line[6:])
def write_pid_file(pid_file, pid):
import fcntl
import stat
try:
fd = os.open(pid_file, os.O_RDWR | os.O_CREAT,
stat.S_IRUSR | stat.S_IWUSR)
except OSError as e:
shell.print_exception(e)
return -1
flags = fcntl.fcntl(fd, fcntl.F_GETFD)
assert flags != -1
flags |= fcntl.FD_CLOEXEC
r = fcntl.fcntl(fd, fcntl.F_SETFD, flags)
assert r != -1
# There is no platform independent way to implement fcntl(fd, F_SETLK, &fl)
# via fcntl.fcntl. So use lockf instead
try:
fcntl.lockf(fd, fcntl.LOCK_EX | fcntl.LOCK_NB, 0, 0, os.SEEK_SET)
except IOError:
r = os.read(fd, 32)
if r:
logging.error('already started at pid %s' % common.to_str(r))
else:
logging.error('already started')
os.close(fd)
return -1
os.ftruncate(fd, 0)
os.write(fd, common.to_bytes(str(pid)))
return 0
def __init__(self, method):
method = common.to_str(method)
self.method = method
self._method_info = self.get_method_info(method)
if self._method_info:
self.obfs = self.get_obfs(method)
else:
raise Exception('obfs plugin [%s] not supported' % method)
def __init__(self, method):
method = common.to_str(method)
self.method = method
self._method_info = self.get_method_info(method)
if self._method_info:
self.obfs = self.get_obfs(method)
else:
raise Exception('obfs plugin [%s] not supported' % method)
def push(self, ch):
ch = ord(ch)
if self.state == 0:
if ch == ord('"'):
self.state = 1
return to_str(chr(ch))
elif ch == ord('/'):
self.state = 3
else:
return to_str(chr(ch))
elif self.state == 1:
if ch == ord('"'):
self.state = 0
return to_str(chr(ch))
elif ch == ord('\\'):
self.state = 2
return to_str(chr(ch))
elif self.state == 2:
self.state = 1
if ch == ord('"'):
return to_str(chr(ch))
return "\\" + to_str(chr(ch))
elif self.state == 3:
if ch == ord('/'):
self.state = 4
else:
return "/" + to_str(chr(ch))
elif self.state == 4:
if ch == ord('\n'):
self.state = 0
return "\n"
return ""
def daemon_stop(pid_file):
import errno
try:
with open(pid_file) as f:
buf = f.read()
pid = common.to_str(buf)
if not buf:
logging.error('not running')
except IOError as e:
shell.print_exception(e)
if e.errno == errno.ENOENT:
# always exit 0 if we are sure daemon is not running
logging.error('not running')
return
sys.exit(1)
pid = int(pid)
if pid > 0:
try:
os.kill(pid, signal.SIGTERM)
except OSError as e:
if e.errno == errno.ESRCH:
logging.error('not running')
# always exit 0 if we are sure daemon is not running
return
shell.print_exception(e)
sys.exit(1)
else:
logging.error('pid is not positive: %d', pid)
# sleep for maximum 10s
for i in range(0, 200):
try:
# query for the pid
os.kill(pid, 0)
except OSError as e:
if e.errno == errno.ESRCH:
break
time.sleep(0.05)
else:
logging.error('timed out when stopping pid %d', pid)
sys.exit(1)
print('stopped')
os.unlink(pid_file)
def check_config(config, is_local):
if config.get('daemon', None) == 'stop':
# no need to specify configuration for daemon stop
return
if is_local and not config.get('password', None):
logging.error('password not specified')
return 2
if not is_local and not config.get('password', None) \
and not config.get('port_password', None):
logging.error('password or port_password not specified')
return 2
if 'local_port' in config:
config['local_port'] = int(config['local_port'])
if 'server_port' in config and type(config['server_port']) != list:
config['server_port'] = int(config['server_port'])
if config.get('local_address', '') in [b'0.0.0.0']:
logging.warning('warning: local set to listen on 0.0.0.0, it\'s not safe')
if config.get('server', '') in ['127.0.0.1', 'localhost']:
logging.warning('warning: server set to listen on %s:%s, are you sure?' %
(to_str(config['server']), config['server_port']))
if config.get('timeout', 300) < 100:
logging.warning('warning: your timeout %d seems too short' %
int(config.get('timeout')))
if config.get('timeout', 300) > 600:
logging.warning('warning: your timeout %d seems too long' %
int(config.get('timeout')))
if config.get('password') in [b'mypassword']:
logging.error('DON\'T USE DEFAULT PASSWORD! Please change it in your '
'config.json!')
return 1
if config.get('user', None) is not None:
if os.name != 'posix':
logging.error('user can be used only on Unix')
return 1
encrypt.try_cipher(config['password'], config['method'])
def check_and_parse_config(config):
is_local=True
if not config:
logging.error('config not specified')
return 9
config['password'] = to_bytes(config.get('password', b''))
config['method'] = to_str(config.get('method', 'aes-256-cfb'))
config['protocol'] = to_str(config.get('protocol', 'origin'))
config['protocol_param'] = to_str(config.get('protocol_param', ''))
config['obfs'] = to_str(config.get('obfs', 'plain'))
config['obfs_param'] = to_str(config.get('obfs_param', ''))
config['port_password'] = config.get('port_password', None)
config['additional_ports'] = config.get('additional_ports', {})
config['additional_ports_only'] = config.get('additional_ports_only', False)
config['timeout'] = int(config.get('timeout', 300))
config['udp_timeout'] = int(config.get('udp_timeout', 120))
config['udp_cache'] = int(config.get('udp_cache', 64))
config['fast_open'] = config.get('fast_open', False)
config['workers'] = config.get('workers', 1)
config['pid-file'] = config.get('pid-file', '/var/run/shadowsocksr.pid')
config['log-file'] = config.get('log-file', '/var/log/shadowsocksr.log')
config['verbose'] = config.get('verbose', False)
config['connect_verbose_info'] = config.get('connect_verbose_info', 0)
config['local_address'] = to_str(config.get('local_address', '127.0.0.1'))
config['local_port'] = config.get('local_port', 1080)
if is_local:
if config.get('server', None) is None:
logging.error('server addr not specified')
return 1
else:
config['server'] = to_str(config['server'])
else:
config['server'] = to_str(config.get('server', '0.0.0.0'))
try:
config['forbidden_ip'] = \
IPNetwork(config.get('forbidden_ip', '127.0.0.0/8,::1/128'))
except Exception as e:
logging.error(e)
return 2
try:
config['forbidden_port'] = PortRange(config.get('forbidden_port', ''))
except Exception as e:
logging.error(e)
return 2
try:
config['ignore_bind'] = \
IPNetwork(config.get('ignore_bind', '127.0.0.0/8,::1/128,10.0.0.0/8,192.168.0.0/16'))
except Exception as e:
logging.error(e)
return 2
config['server_port'] = config.get('server_port', 8388)
logging.getLogger('').handlers = []
logging.addLevelName(VERBOSE_LEVEL, 'VERBOSE')
if config['verbose'] >= 2:
level = VERBOSE_LEVEL
elif config['verbose'] == 1:
level = logging.DEBUG
elif config['verbose'] == -1:
level = logging.WARN
elif config['verbose'] <= -2:
level = logging.ERROR
else:
level = logging.INFO
verbose = config['verbose']
logging.basicConfig(level=level,
format='%(asctime)s %(levelname)-8s %(filename)s:%(lineno)s %(message)s',
datefmt='%Y-%m-%d %H:%M:%S')
check_config(config, is_local)
return config
def get_config(is_local):
global verbose
config = {}
config_path = None
logging.basicConfig(level=logging.INFO,
format='%(levelname)-s: %(message)s')
if is_local:
shortopts = 'hd:s:b:p:k:l:m:O:o:G:g:c:t:vq'
longopts = ['help', 'fast-open', 'pid-file=', 'log-file=', 'user='******'version']
else:
shortopts = 'hd:s:p:k:m:O:o:G:g:c:t:vq'
longopts = ['help', 'fast-open', 'pid-file=', 'log-file=', 'workers=',
'forbidden-ip=', 'user='******'manager-address=', 'version']
try:
optlist, args = getopt.getopt(sys.argv[1:], shortopts, longopts)
for key, value in optlist:
if key == '-c':
config_path = value
elif key in ('-h', '--help'):
print_help(is_local)
sys.exit(0)
elif key == '--version':
print_shadowsocks()
sys.exit(0)
else:
continue
if config_path is None:
config_path = find_config()
if config_path:
logging.debug('loading config from %s' % config_path)
with open(config_path, 'rb') as f:
try:
config = parse_json_in_str(remove_comment(f.read().decode('utf8')))
except ValueError as e:
logging.error('found an error in config.json: %s', str(e))
sys.exit(1)
v_count = 0
for key, value in optlist:
if key == '-p':
config['server_port'] = int(value)
elif key == '-k':
config['password'] = to_bytes(value)
elif key == '-l':
config['local_port'] = int(value)
elif key == '-s':
config['server'] = to_str(value)
elif key == '-m':
config['method'] = to_str(value)
elif key == '-O':
config['protocol'] = to_str(value)
elif key == '-o':
config['obfs'] = to_str(value)
elif key == '-G':
config['protocol_param'] = to_str(value)
elif key == '-g':
config['obfs_param'] = to_str(value)
elif key == '-b':
config['local_address'] = to_str(value)
elif key == '-v':
v_count += 1
# '-vv' turns on more verbose mode
config['verbose'] = v_count
elif key == '-t':
config['timeout'] = int(value)
elif key == '--fast-open':
config['fast_open'] = True
elif key == '--workers':
config['workers'] = int(value)
elif key == '--manager-address':
config['manager_address'] = value
elif key == '--user':
config['user'] = to_str(value)
elif key == '--forbidden-ip':
config['forbidden_ip'] = to_str(value)
elif key == '-d':
config['daemon'] = to_str(value)
elif key == '--pid-file':
config['pid-file'] = to_str(value)
elif key == '--log-file':
config['log-file'] = to_str(value)
elif key == '-q':
v_count -= 1
config['verbose'] = v_count
else:
continue
except getopt.GetoptError as e:
print(e, file=sys.stderr)
sys.exit(2)
if not config:
logging.error('config not specified')
sys.exit(2)
config['password'] = to_bytes(config.get('password', b''))
config['method'] = to_str(config.get('method', 'aes-256-cfb'))
config['protocol'] = to_str(config.get('protocol', 'origin'))
config['protocol_param'] = to_str(config.get('protocol_param', ''))
config['obfs'] = to_str(config.get('obfs', 'plain'))
config['obfs_param'] = to_str(config.get('obfs_param', ''))
config['port_password'] = config.get('port_password', None)
config['additional_ports'] = config.get('additional_ports', {})
config['additional_ports_only'] = config.get('additional_ports_only', False)
config['timeout'] = int(config.get('timeout', 300))
config['udp_timeout'] = int(config.get('udp_timeout', 120))
config['udp_cache'] = int(config.get('udp_cache', 64))
config['fast_open'] = config.get('fast_open', False)
config['workers'] = config.get('workers', 1)
config['pid-file'] = config.get('pid-file', '/var/run/shadowsocksr.pid')
config['log-file'] = config.get('log-file', '/var/log/shadowsocksr.log')
config['verbose'] = config.get('verbose', False)
config['connect_verbose_info'] = config.get('connect_verbose_info', 0)
config['local_address'] = to_str(config.get('local_address', '127.0.0.1'))
config['local_port'] = config.get('local_port', 1080)
if is_local:
if config.get('server', None) is None:
logging.error('server addr not specified')
sys.exit(2)
else:
config['server'] = to_str(config['server'])
else:
config['server'] = to_str(config.get('server', '0.0.0.0'))
try:
config['forbidden_ip'] = \
IPNetwork(config.get('forbidden_ip', '127.0.0.0/8,::1/128'))
except Exception as e:
logging.error(e)
sys.exit(2)
try:
config['forbidden_port'] = PortRange(config.get('forbidden_port', ''))
except Exception as e:
logging.error(e)
sys.exit(2)
try:
config['ignore_bind'] = \
IPNetwork(config.get('ignore_bind', '127.0.0.0/8,::1/128,10.0.0.0/8,192.168.0.0/16'))
except Exception as e:
logging.error(e)
sys.exit(2)
config['server_port'] = config.get('server_port', 8388)
logging.getLogger('').handlers = []
logging.addLevelName(VERBOSE_LEVEL, 'VERBOSE')
if config['verbose'] >= 2:
level = VERBOSE_LEVEL
elif config['verbose'] == 1:
level = logging.DEBUG
elif config['verbose'] == -1:
level = logging.WARN
elif config['verbose'] <= -2:
level = logging.ERROR
else:
level = logging.INFO
verbose = config['verbose']
logging.basicConfig(level=level,
format='%(asctime)s %(levelname)-8s %(filename)s:%(lineno)s %(message)s',
datefmt='%Y-%m-%d %H:%M:%S')
check_config(config, is_local)
return config
def main():
shell.check_python()
config = shell.get_config(False)
shell.log_shadowsocks_version()
daemon.daemon_exec(config)
try:
import resource
logging.info('current process RLIMIT_NOFILE resource: soft %d hard %d' % resource.getrlimit(resource.RLIMIT_NOFILE))
except ImportError:
pass
if config['port_password']:
pass
else:
config['port_password'] = {}
server_port = config['server_port']
if type(server_port) == list:
for a_server_port in server_port:
config['port_password'][a_server_port] = config['password']
else:
config['port_password'][str(server_port)] = config['password']
if not config.get('dns_ipv6', False):
asyncdns.IPV6_CONNECTION_SUPPORT = False
if config.get('manager_address', 0):
logging.info('entering manager mode')
manager.run(config)
return
tcp_servers = []
udp_servers = []
dns_resolver = asyncdns.DNSResolver()
if int(config['workers']) > 1:
stat_counter_dict = None
else:
stat_counter_dict = {}
port_password = config['port_password']
config_password = config.get('password', 'm')
del config['port_password']
for port, password_obfs in port_password.items():
method = config["method"]
protocol = config.get("protocol", 'origin')
protocol_param = config.get("protocol_param", '')
obfs = config.get("obfs", 'plain')
obfs_param = config.get("obfs_param", '')
bind = config.get("out_bind", '')
bindv6 = config.get("out_bindv6", '')
if type(password_obfs) == list:
password = password_obfs[0]
obfs = common.to_str(password_obfs[1])
if len(password_obfs) > 2:
protocol = common.to_str(password_obfs[2])
elif type(password_obfs) == dict:
password = password_obfs.get('password', config_password)
method = common.to_str(password_obfs.get('method', method))
protocol = common.to_str(password_obfs.get('protocol', protocol))
protocol_param = common.to_str(password_obfs.get('protocol_param', protocol_param))
obfs = common.to_str(password_obfs.get('obfs', obfs))
obfs_param = common.to_str(password_obfs.get('obfs_param', obfs_param))
bind = password_obfs.get('out_bind', bind)
bindv6 = password_obfs.get('out_bindv6', bindv6)
else:
password = password_obfs
a_config = config.copy()
ipv6_ok = False
logging.info("server start with protocol[%s] password [%s] method [%s] obfs [%s] obfs_param [%s]" %
(protocol, password, method, obfs, obfs_param))
if 'server_ipv6' in a_config:
try:
if len(a_config['server_ipv6']) > 2 and a_config['server_ipv6'][0] == "[" and a_config['server_ipv6'][-1] == "]":
a_config['server_ipv6'] = a_config['server_ipv6'][1:-1]
a_config['server_port'] = int(port)
a_config['password'] = password
a_config['method'] = method
a_config['protocol'] = protocol
a_config['protocol_param'] = protocol_param
a_config['obfs'] = obfs
a_config['obfs_param'] = obfs_param
a_config['out_bind'] = bind
a_config['out_bindv6'] = bindv6
a_config['server'] = a_config['server_ipv6']
logging.info("starting server at [%s]:%d" %
(a_config['server'], int(port)))
tcp_servers.append(tcprelay.TCPRelay(a_config, dns_resolver, False, stat_counter=stat_counter_dict))
udp_servers.append(udprelay.UDPRelay(a_config, dns_resolver, False, stat_counter=stat_counter_dict))
if a_config['server_ipv6'] == b"::":
ipv6_ok = True
except Exception as e:
shell.print_exception(e)
try:
a_config = config.copy()
a_config['server_port'] = int(port)
a_config['password'] = password
a_config['method'] = method
a_config['protocol'] = protocol
a_config['protocol_param'] = protocol_param
a_config['obfs'] = obfs
a_config['obfs_param'] = obfs_param
a_config['out_bind'] = bind
a_config['out_bindv6'] = bindv6
logging.info("starting server at %s:%d" %
(a_config['server'], int(port)))
tcp_servers.append(tcprelay.TCPRelay(a_config, dns_resolver, False, stat_counter=stat_counter_dict))
udp_servers.append(udprelay.UDPRelay(a_config, dns_resolver, False, stat_counter=stat_counter_dict))
except Exception as e:
if not ipv6_ok:
shell.print_exception(e)
def run_server():
def child_handler(signum, _):
logging.warn('received SIGQUIT, doing graceful shutting down..')
list(map(lambda s: s.close(next_tick=True),
tcp_servers + udp_servers))
signal.signal(getattr(signal, 'SIGQUIT', signal.SIGTERM),
child_handler)
def int_handler(signum, _):
sys.exit(1)
signal.signal(signal.SIGINT, int_handler)
try:
loop = eventloop.EventLoop()
dns_resolver.add_to_loop(loop)
list(map(lambda s: s.add_to_loop(loop), tcp_servers + udp_servers))
daemon.set_user(config.get('user', None))
loop.run()
except Exception as e:
shell.print_exception(e)
sys.exit(1)
if int(config['workers']) > 1:
if os.name == 'posix':
children = []
is_child = False
for i in range(0, int(config['workers'])):
r = os.fork()
if r == 0:
logging.info('worker started')
is_child = True
run_server()
break
else:
children.append(r)
if not is_child:
def handler(signum, _):
for pid in children:
try:
os.kill(pid, signum)
os.waitpid(pid, 0)
except OSError: # child may already exited
pass
sys.exit()
signal.signal(signal.SIGTERM, handler)
signal.signal(signal.SIGQUIT, handler)
signal.signal(signal.SIGINT, handler)
# master
for a_tcp_server in tcp_servers:
a_tcp_server.close()
for a_udp_server in udp_servers:
a_udp_server.close()
dns_resolver.close()
for child in children:
os.waitpid(child, 0)
else:
logging.warn('worker is only available on Unix/Linux')
run_server()
else:
run_server()
def _handle_server_dns_resolved(self, error, remote_addr, server_addr,
params):
if error:
return
data, r_addr, uid, header_length = params
user_id = self._listen_port
try:
server_port = remote_addr[1]
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs: # drop
return
af, socktype, proto, canonname, sa = addrs[0]
server_addr = sa[0]
key = client_key(r_addr, af)
client_pair = self._cache.get(key, None)
if client_pair is None:
client_pair = self._cache_dns_client.get(key, None)
if client_pair is None:
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('IP %s is in forbidden list, drop' %
common.to_str(sa[0]))
# drop
return
if self._forbidden_portset:
if sa[1] in self._forbidden_portset:
logging.debug('Port %d is in forbidden list, reject' %
sa[1])
# drop
return
client = socket.socket(af, socktype, proto)
client_uid = uid
client.setblocking(False)
self._socket_bind_addr(client, af)
is_dns = False
if len(data) > header_length + 13 and data[
header_length + 4:header_length +
12] == b"\x00\x01\x00\x00\x00\x00\x00\x00":
is_dns = True
else:
pass
if sa[1] == 53 and is_dns: #DNS
logging.debug("DNS query %s from %s:%d" %
(common.to_str(sa[0]), r_addr[0], r_addr[1]))
self._cache_dns_client[key] = (client, uid)
else:
self._cache[key] = (client, uid)
self._client_fd_to_server_addr[client.fileno()] = (r_addr, af)
self._sockets.add(client.fileno())
self._eventloop.add(client, eventloop.POLL_IN, self)
logging.debug('UDP port %5d sockets %d' %
(self._listen_port, len(self._sockets)))
if uid is not None:
user_id = struct.unpack('<I', client_uid)[0]
else:
client, client_uid = client_pair
self._cache.clear(self._udp_cache_size)
self._cache_dns_client.clear(16)
if self._is_local:
ref_iv = [encrypt.encrypt_new_iv(self._method)]
self._protocol.obfs.server_info.iv = ref_iv[0]
data = self._protocol.client_udp_pre_encrypt(data)
#logging.debug("%s" % (binascii.hexlify(data),))
data = encrypt.encrypt_all_iv(
self._protocol.obfs.server_info.key, self._method, 1, data,
ref_iv)
if not data:
return
else:
data = data[header_length:]
if not data:
return
except Exception as e:
shell.print_exception(e)
logging.error("exception from user %d" % (user_id, ))
try:
client.sendto(data, (server_addr, server_port))
self.add_transfer_u(client_uid, len(data))
if client_pair is None: # new request
addr, port = client.getsockname()[:2]
common.connect_log(
'UDP data to %s(%s):%d from %s:%d by user %d' %
(common.to_str(remote_addr[0]), common.to_str(server_addr),
server_port, addr, port, user_id))
except IOError as e:
err = eventloop.errno_from_exception(e)
logging.warning('IOError sendto %s:%d by user %d' %
(server_addr, server_port, user_id))
if err in (errno.EINPROGRESS, errno.EAGAIN):
pass
else:
shell.print_exception(e)
def _handle_server_dns_resolved(self, error, remote_addr, server_addr, params):
if error:
return
data, r_addr, uid, header_length = params
user_id = self._listen_port
try:
server_port = remote_addr[1]
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs: # drop
return
af, socktype, proto, canonname, sa = addrs[0]
server_addr = sa[0]
key = client_key(r_addr, af)
client_pair = self._cache.get(key, None)
if client_pair is None:
client_pair = self._cache_dns_client.get(key, None)
if client_pair is None:
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('IP %s is in forbidden list, drop' % common.to_str(sa[0]))
# drop
return
if self._forbidden_portset:
if sa[1] in self._forbidden_portset:
logging.debug('Port %d is in forbidden list, reject' % sa[1])
# drop
return
client = socket.socket(af, socktype, proto)
client_uid = uid
client.setblocking(False)
self._socket_bind_addr(client, af)
is_dns = False
if len(data) > header_length + 13 and data[header_length + 4 : header_length + 12] == b"\x00\x01\x00\x00\x00\x00\x00\x00":
is_dns = True
else:
pass
if sa[1] == 53 and is_dns: #DNS
logging.debug("DNS query %s from %s:%d" % (common.to_str(sa[0]), r_addr[0], r_addr[1]))
self._cache_dns_client[key] = (client, uid)
else:
self._cache[key] = (client, uid)
self._client_fd_to_server_addr[client.fileno()] = (r_addr, af)
self._sockets.add(client.fileno())
self._eventloop.add(client, eventloop.POLL_IN, self)
logging.debug('UDP port %5d sockets %d' % (self._listen_port, len(self._sockets)))
if uid is not None:
user_id = struct.unpack('<I', client_uid)[0]
else:
client, client_uid = client_pair
self._cache.clear(self._udp_cache_size)
self._cache_dns_client.clear(16)
if self._is_local:
ref_iv = [encrypt.encrypt_new_iv(self._method)]
self._protocol.obfs.server_info.iv = ref_iv[0]
data = self._protocol.client_udp_pre_encrypt(data)
#logging.debug("%s" % (binascii.hexlify(data),))
data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 1, data, ref_iv)
if not data:
return
else:
data = data[header_length:]
if not data:
return
except Exception as e:
shell.print_exception(e)
logging.error("exception from user %d" % (user_id,))
try:
client.sendto(data, (server_addr, server_port))
self.add_transfer_u(client_uid, len(data))
if client_pair is None: # new request
addr, port = client.getsockname()[:2]
common.connect_log('UDP data to %s(%s):%d from %s:%d by user %d' %
(common.to_str(remote_addr[0]), common.to_str(server_addr), server_port, addr, port, user_id))
except IOError as e:
err = eventloop.errno_from_exception(e)
logging.warning('IOError sendto %s:%d by user %d' % (server_addr, server_port, user_id))
if err in (errno.EINPROGRESS, errno.EAGAIN):
pass
else:
shell.print_exception(e)