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[socks] Support SOCKS proxies
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Yen Chi Hsuan committed May 10, 2016
1 parent dab0dae commit 71aff18
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Showing 2 changed files with 116 additions and 145 deletions.
198 changes: 55 additions & 143 deletions youtube_dl/socks.py
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@@ -1,84 +1,38 @@
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#
# For more information, please refer to <http://unlicense.org/>
#
# Example:
# import socks
# import ftplib
# import socket
#
# socks.patch_socket()
#
# f = ftplib.FTP('ftp.kernel.org')
# f.login()
# print f.retrlines('LIST')
# f.quit()
#
# s = socket.create_connection(('www.google.com', 80))
# s.sendall('HEAD / HTTP/1.0\r\n\r\n')
# print s.recv(1024)
# s.close()
# Public Domain SOCKS proxy protocol implementation
# Adapted from https://gist.github.com/bluec0re/cafd3764412967417fd3

from __future__ import unicode_literals
import os
import struct
import socket
import time

__author__ = 'Timo Schmid <coding@timoschmid.de>'
import collections
import socket

_orig_socket = socket.socket
from .compat import (
struct_pack,
struct_unpack,
)

try:
from collections import namedtuple
except ImportError:
from Collections import namedtuple
__author__ = 'Timo Schmid <coding@timoschmid.de>'

try:
from urllib.parse import urlparse
except:
from urlparse import urlparse

try:
from enum import Enum
except ImportError:
Enum = object
class ProxyError(IOError):
pass


class ProxyError(IOError): pass
class Socks4Error(ProxyError):
CODES = {
0x5B: 'request rejected or failed',
0x5C: 'request rejected becasue SOCKS server cannot connect to identd on the client',
0x5D: 'request rejected because the client program and identd report different user-ids'
}

def __init__(self, code=None, msg=None):
if code is not None and msg is None:
msg = self.CODES.get(code)
if msg is None:
msg = 'unknown error'
super(Socks4Error, self).__init__(code, msg)


class Socks5Error(Socks4Error):
CODES = {
0x01: 'general SOCKS server failure',
Expand All @@ -93,68 +47,19 @@ class Socks5Error(Socks4Error):
0xFF: 'all offered authentication methods were rejected'
}

class ProxyType(Enum):
SOCKS4 = 0

class ProxyType(object):
SOCKS4 = 0
SOCKS4A = 1
SOCKS5 = 2

Proxy = namedtuple('Proxy', ('type', 'host', 'port', 'username', 'password', 'remote_dns'))

_default_proxy = None

def setdefaultproxy(proxytype=None, addr=None, port=None, rdns=True, username=None, password=None, allow_env_override=True):
global _default_proxy
if allow_env_override:
all_proxy = os.environ.get('ALL_PROXY', os.environ.get('all_proxy'))
if all_proxy:
all_proxy = urlparse(all_proxy)
if all_proxy.scheme.startswith('socks'):
if all_proxy.scheme == 'socks' or all_proxy.scheme == 'socks4':
proxytype = ProxyType.SOCKS4
elif all_proxy.scheme == 'socks4a':
proxytype = ProxyType.SOCKS4A
elif all_proxy.scheme == 'socks5':
proxytype = ProxyType.SOCKS5
addr = all_proxy.hostname
port = all_proxy.port
username = all_proxy.username
password = all_proxy.password

if proxytype is not None:
_default_proxy = Proxy(proxytype, addr, port, username, password, rdns)


def wrap_socket(sock):
return socksocket(_sock=sock._sock)

def wrap_module(module):
if hasattr(module, 'socket'):
sock = module.socket
if isinstance(sock, socket.socket):
module.socket = sockssocket
elif hasattr(socket, 'socket'):
socket.socket = sockssocket

def patch_socket():
import sys
if 'socket' not in sys.modules:
import socket
sys.modules['socket'].socket = sockssocket
SOCKS5 = 2

Proxy = collections.namedtuple('Proxy', ('type', 'host', 'port', 'username', 'password', 'remote_dns'))

class sockssocket(socket.socket):
def __init__(self, *args, **kwargs):
self.__proxy = None
if 'proxy' in kwargs:
self.__proxy = kwargs['proxy']
del kwargs['proxy']
super(sockssocket, self).__init__(*args, **kwargs)

class sockssocket(socket.socket):
@property
def _proxy(self):
if self.__proxy:
return self.__proxy
return _default_proxy
return self.__proxy

@property
def _proxy_port(self):
Expand All @@ -175,7 +80,7 @@ def recvall(self, cnt):
while len(data) < cnt:
cur = self.recv(cnt - len(data))
if not cur:
raise IOError("{0} bytes missing".format(cnt-len(data)))
raise IOError('{0} bytes missing'.format(cnt - len(data)))
data += cur
return data

Expand All @@ -186,39 +91,42 @@ def _setup_socks4(self, address, is_4a=False):
ipaddr = socket.inet_aton(destaddr)
except socket.error:
if is_4a and self._proxy.remote_dns:
ipaddr = struct.pack('!BBBB', 0, 0, 0, 0xFF)
ipaddr = struct_pack('!BBBB', 0, 0, 0, 0xFF)
else:
ipaddr = socket.inet_aton(socket.gethostbyname(destaddr))

packet = struct.pack('!BBH', 0x4, 0x1, port) + ipaddr
packet = struct_pack('!BBH', 0x4, 0x1, port) + ipaddr
if self._proxy.username:
username = self._proxy.username
if hasattr(username, 'encode'):
username = username.encode()
packet += struct.pack('!{0}s'.format(len(username)+1), username)
packet += struct_pack('!{0}s'.format(len(username) + 1), username)
else:
packet += b'\x00'

if is_4a and self._proxy.remote_dns:
if hasattr(destaddr, 'encode'):
destaddr = destaddr.encode()
packet += struct.pack('!{0}s'.format(len(destaddr)+1), destaddr)
packet += struct_pack('!{0}s'.format(len(destaddr) + 1), destaddr)

self.sendall(packet)

packet = self.recvall(8)
nbyte, resp_code, dstport, dsthost = struct.unpack('!BBHI', packet)
nbyte, resp_code, dstport, dsthost = struct_unpack('!BBHI', packet)

# check valid response
if nbyte != 0x00:
self.close()
raise ProxyError(0, "Invalid response from server. Expected {0:02x} got {1:02x}".format(0, nbyte))
raise ProxyError(
0, 'Invalid response from server. Expected {0:02x} got {1:02x}'.format(0, nbyte))

# access granted
if resp_code != 0x5a:
self.close()
raise Socks4Error(resp_code)

return (dsthost, dstport)

def _setup_socks5(self, address):
destaddr, port = address

Expand All @@ -234,19 +142,20 @@ def _setup_socks5(self, address):
if self._proxy.username and self._proxy.password:
# two auth methods available
auth_methods = 2
packet = struct.pack('!BBB', 0x5, auth_methods, 0x00) # no auth
packet = struct_pack('!BBB', 0x5, auth_methods, 0x00) # no auth
if self._proxy.username and self._proxy.password:
packet += struct.pack('!B', 0x02) # user/pass auth
packet += struct_pack('!B', 0x02) # user/pass auth

self.sendall(packet)

packet = self.recvall(2)
version, method = struct.unpack('!BB', packet)
version, method = struct_unpack('!BB', packet)

# check valid response
if version != 0x05:
self.close()
raise ProxyError(0, "Invalid response from server. Expected {0:02x} got {1:02x}".format(5, version))
raise ProxyError(
0, 'Invalid response from server. Expected {0:02x} got {1:02x}'.format(5, version))

# no auth methods
if method == 0xFF:
Expand All @@ -261,41 +170,42 @@ def _setup_socks5(self, address):
password = self._proxy.password
if hasattr(password, 'encode'):
password = password.encode()
packet = struct.pack('!BB', 1, len(username)) + username
packet += struct.pack('!B', len(password)) + password
packet = struct_pack('!BB', 1, len(username)) + username
packet += struct_pack('!B', len(password)) + password
self.sendall(packet)

packet = self.recvall(2)
version, status = struct.unpack('!BB', packet)
version, status = struct_unpack('!BB', packet)

if version != 0x01:
self.close()
raise ProxyError(0, "Invalid response from server. Expected {0:02x} got {1:02x}".format(1, version))
raise ProxyError(
0, 'Invalid response from server. Expected {0:02x} got {1:02x}'.format(1, version))

if status != 0x00:
self.close()
raise Socks5Error(1)
elif method == 0x00: # no auth
elif method == 0x00: # no auth
pass


packet = struct.pack('!BBB', 5, 1, 0)
packet = struct_pack('!BBB', 5, 1, 0)
if ipaddr is None:
if hasattr(destaddr, 'encode'):
destaddr = destaddr.encode()
packet += struct.pack('!BB', 3, len(destaddr)) + destaddr
packet += struct_pack('!BB', 3, len(destaddr)) + destaddr
else:
packet += struct.pack('!B', 1) + ipaddr
packet += struct.pack('!H', port)
packet += struct_pack('!B', 1) + ipaddr
packet += struct_pack('!H', port)

self.sendall(packet)

packet = self.recvall(4)
version, status, _, atype = struct.unpack('!BBBB', packet)
version, status, _, atype = struct_unpack('!BBBB', packet)

if version != 0x05:
self.close()
raise ProxyError(0, "Invalid response from server. Expected {0:02x} got {1:02x}".format(5, version))
raise ProxyError(
0, 'Invalid response from server. Expected {0:02x} got {1:02x}'.format(5, version))

if status != 0x00:
self.close()
Expand All @@ -304,11 +214,13 @@ def _setup_socks5(self, address):
if atype == 0x01:
destaddr = self.recvall(4)
elif atype == 0x03:
alen = struct.unpack('!B', self.recv(1))[0]
alen = struct_unpack('!B', self.recv(1))[0]
destaddr = self.recvall(alen)
elif atype == 0x04:
destaddr = self.recvall(16)
destport = struct.unpack('!H', self.recvall(2))[0]
destport = struct_unpack('!H', self.recvall(2))[0]

return (destaddr, destport)

def _make_proxy(self, connect_func, address):
if self._proxy.type == ProxyType.SOCKS4:
Expand All @@ -330,7 +242,7 @@ def _make_proxy(self, connect_func, address):
return connect_func(self, address)

def connect(self, address):
self._make_proxy(_orig_socket.connect, address)
self._make_proxy(socket.socket.connect, address)

def connect_ex(self, address):
return self._make_proxy(_orig_socket.connect_ex, address)
return self._make_proxy(socket.socket.connect_ex, address)

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