/usr/lib/python2.7/dist-packages/gevent/resolver_ares.py is in python-gevent 1.0.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from __future__ import absolute_import
import os
import sys
from _socket import getservbyname, getaddrinfo, gaierror, error
from gevent.hub import Waiter, get_hub, string_types
from gevent.socket import AF_UNSPEC, AF_INET, AF_INET6, SOCK_STREAM, SOCK_DGRAM, SOCK_RAW, AI_NUMERICHOST, EAI_SERVICE, AI_PASSIVE
from gevent.ares import channel, InvalidIP
__all__ = ['Resolver']
class Resolver(object):
ares_class = channel
def __init__(self, hub=None, use_environ=True, **kwargs):
if hub is None:
hub = get_hub()
self.hub = hub
if use_environ:
for key in os.environ.iterkeys():
if key.startswith('GEVENTARES_'):
name = key[11:].lower()
if name:
value = os.environ[key]
kwargs.setdefault(name, value)
self.ares = self.ares_class(hub.loop, **kwargs)
self.pid = os.getpid()
self.params = kwargs
self.fork_watcher = hub.loop.fork(ref=False)
self.fork_watcher.start(self._on_fork)
def __repr__(self):
return '<gevent.resolver_ares.Resolver at 0x%x ares=%r>' % (id(self), self.ares)
def _on_fork(self):
pid = os.getpid()
if pid != self.pid:
self.hub.loop.run_callback(self.ares.destroy)
self.ares = self.ares_class(self.hub.loop, **self.params)
self.pid = pid
def close(self):
if self.ares is not None:
self.hub.loop.run_callback(self.ares.destroy)
self.ares = None
self.fork_watcher.stop()
def gethostbyname(self, hostname, family=AF_INET):
hostname = _resolve_special(hostname, family)
return self.gethostbyname_ex(hostname, family)[-1][0]
def gethostbyname_ex(self, hostname, family=AF_INET):
if isinstance(hostname, unicode):
hostname = hostname.encode('ascii')
elif not isinstance(hostname, str):
raise TypeError('Expected string, not %s' % type(hostname).__name__)
while True:
ares = self.ares
try:
waiter = Waiter(self.hub)
ares.gethostbyname(waiter, hostname, family)
result = waiter.get()
if not result[-1]:
raise gaierror(-5, 'No address associated with hostname')
return result
except gaierror:
if ares is self.ares:
raise
# "self.ares is not ares" means channel was destroyed (because we were forked)
def _lookup_port(self, port, socktype):
socktypes = []
if isinstance(port, string_types):
try:
port = int(port)
except ValueError:
try:
if socktype == 0:
origport = port
try:
port = getservbyname(port, 'tcp')
socktypes.append(SOCK_STREAM)
except error:
port = getservbyname(port, 'udp')
socktypes.append(SOCK_DGRAM)
else:
try:
if port == getservbyname(origport, 'udp'):
socktypes.append(SOCK_DGRAM)
except error:
pass
elif socktype == SOCK_STREAM:
port = getservbyname(port, 'tcp')
elif socktype == SOCK_DGRAM:
port = getservbyname(port, 'udp')
else:
raise gaierror(EAI_SERVICE, 'Servname not supported for ai_socktype')
except error:
ex = sys.exc_info()[1]
if 'not found' in str(ex):
raise gaierror(EAI_SERVICE, 'Servname not supported for ai_socktype')
else:
raise gaierror(str(ex))
except UnicodeEncodeError:
raise error('Int or String expected')
elif port is None:
port = 0
elif isinstance(port, int):
pass
else:
raise error('Int or String expected')
port = int(port % 65536)
if not socktypes and socktype:
socktypes.append(socktype)
return port, socktypes
def _getaddrinfo(self, host, port, family=0, socktype=0, proto=0, flags=0):
if isinstance(host, unicode):
host = host.encode('idna')
elif not isinstance(host, str) or (flags & AI_NUMERICHOST):
# this handles cases which do not require network access
# 1) host is None
# 2) host is of an invalid type
# 3) AI_NUMERICHOST flag is set
return getaddrinfo(host, port, family, socktype, proto, flags)
# we also call _socket.getaddrinfo below if family is not one of AF_*
port, socktypes = self._lookup_port(port, socktype)
socktype_proto = [(SOCK_STREAM, 6), (SOCK_DGRAM, 17), (SOCK_RAW, 0)]
if socktypes:
socktype_proto = [(x, y) for (x, y) in socktype_proto if x in socktypes]
if proto:
socktype_proto = [(x, y) for (x, y) in socktype_proto if proto == y]
ares = self.ares
if family == AF_UNSPEC:
values = Values(self.hub, 2)
ares.gethostbyname(values, host, AF_INET)
ares.gethostbyname(values, host, AF_INET6)
elif family == AF_INET:
values = Values(self.hub, 1)
ares.gethostbyname(values, host, AF_INET)
elif family == AF_INET6:
values = Values(self.hub, 1)
ares.gethostbyname(values, host, AF_INET6)
else:
raise gaierror(5, 'ai_family not supported: %r' % (family, ))
values = values.get()
if len(values) == 2 and values[0] == values[1]:
values.pop()
result = []
result4 = []
result6 = []
for addrs in values:
if addrs.family == AF_INET:
for addr in addrs[-1]:
sockaddr = (addr, port)
for socktype, proto in socktype_proto:
result4.append((AF_INET, socktype, proto, '', sockaddr))
elif addrs.family == AF_INET6:
for addr in addrs[-1]:
if addr == '::1':
dest = result
else:
dest = result6
sockaddr = (addr, port, 0, 0)
for socktype, proto in socktype_proto:
dest.append((AF_INET6, socktype, proto, '', sockaddr))
result += result4 + result6
if not result:
raise gaierror(-5, 'No address associated with hostname')
return result
def getaddrinfo(self, host, port, family=0, socktype=0, proto=0, flags=0):
while True:
ares = self.ares
try:
return self._getaddrinfo(host, port, family, socktype, proto, flags)
except gaierror:
if ares is self.ares:
raise
def _gethostbyaddr(self, ip_address):
if isinstance(ip_address, unicode):
ip_address = ip_address.encode('ascii')
elif not isinstance(ip_address, str):
raise TypeError('Expected string, not %s' % type(ip_address).__name__)
waiter = Waiter(self.hub)
try:
self.ares.gethostbyaddr(waiter, ip_address)
return waiter.get()
except InvalidIP:
result = self._getaddrinfo(ip_address, None, family=AF_UNSPEC, socktype=SOCK_DGRAM)
if not result:
raise
_ip_address = result[0][-1][0]
if _ip_address == ip_address:
raise
waiter.clear()
self.ares.gethostbyaddr(waiter, _ip_address)
return waiter.get()
def gethostbyaddr(self, ip_address):
ip_address = _resolve_special(ip_address, AF_UNSPEC)
while True:
ares = self.ares
try:
return self._gethostbyaddr(ip_address)
except gaierror:
if ares is self.ares:
raise
def _getnameinfo(self, sockaddr, flags):
if not isinstance(flags, int):
raise TypeError('an integer is required')
if not isinstance(sockaddr, tuple):
raise TypeError('getnameinfo() argument 1 must be a tuple')
address = sockaddr[0]
if isinstance(address, unicode):
address = address.encode('ascii')
if not isinstance(address, str):
raise TypeError('sockaddr[0] must be a string, not %s' % type(address).__name__)
port = sockaddr[1]
if not isinstance(port, int):
raise TypeError('port must be an integer, not %s' % type(port))
waiter = Waiter(self.hub)
result = self._getaddrinfo(address, str(sockaddr[1]), family=AF_UNSPEC, socktype=SOCK_DGRAM)
if not result:
raise
elif len(result) != 1:
raise error('sockaddr resolved to multiple addresses')
family, socktype, proto, name, address = result[0]
if family == AF_INET:
if len(sockaddr) != 2:
raise error("IPv4 sockaddr must be 2 tuple")
elif family == AF_INET6:
address = address[:2] + sockaddr[2:]
self.ares.getnameinfo(waiter, address, flags)
node, service = waiter.get()
if service is None:
service = '0'
return node, service
def getnameinfo(self, sockaddr, flags):
while True:
ares = self.ares
try:
return self._getnameinfo(sockaddr, flags)
except gaierror:
if ares is self.ares:
raise
class Values(object):
# helper to collect multiple values; ignore errors unless nothing has succeeded
# QQQ could probably be moved somewhere - hub.py?
__slots__ = ['count', 'values', 'error', 'waiter']
def __init__(self, hub, count):
self.count = count
self.values = []
self.error = None
self.waiter = Waiter(hub)
def __call__(self, source):
self.count -= 1
if source.exception is None:
self.values.append(source.value)
else:
self.error = source.exception
if self.count <= 0:
self.waiter.switch()
def get(self):
self.waiter.get()
if self.values:
return self.values
else:
raise self.error
def _resolve_special(hostname, family):
if hostname == '':
result = getaddrinfo(None, 0, family, SOCK_DGRAM, 0, AI_PASSIVE)
if len(result) != 1:
raise error('wildcard resolved to multiple address')
return result[0][4][0]
return hostname
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