mirror of https://gitlab.com/dstftw/youtube-dl
274 lines
8.7 KiB
Python
274 lines
8.7 KiB
Python
# Public Domain SOCKS proxy protocol implementation
|
|
# Adapted from https://gist.github.com/bluec0re/cafd3764412967417fd3
|
|
|
|
from __future__ import unicode_literals
|
|
|
|
# References:
|
|
# SOCKS4 protocol http://www.openssh.com/txt/socks4.protocol
|
|
# SOCKS4A protocol http://www.openssh.com/txt/socks4a.protocol
|
|
# SOCKS5 protocol https://tools.ietf.org/html/rfc1928
|
|
# SOCKS5 username/password authentication https://tools.ietf.org/html/rfc1929
|
|
|
|
import collections
|
|
import socket
|
|
|
|
from .compat import (
|
|
compat_ord,
|
|
compat_struct_pack,
|
|
compat_struct_unpack,
|
|
)
|
|
|
|
__author__ = 'Timo Schmid <coding@timoschmid.de>'
|
|
|
|
SOCKS4_VERSION = 4
|
|
SOCKS4_REPLY_VERSION = 0x00
|
|
# Excerpt from SOCKS4A protocol:
|
|
# if the client cannot resolve the destination host's domain name to find its
|
|
# IP address, it should set the first three bytes of DSTIP to NULL and the last
|
|
# byte to a non-zero value.
|
|
SOCKS4_DEFAULT_DSTIP = compat_struct_pack('!BBBB', 0, 0, 0, 0xFF)
|
|
|
|
SOCKS5_VERSION = 5
|
|
SOCKS5_USER_AUTH_VERSION = 0x01
|
|
SOCKS5_USER_AUTH_SUCCESS = 0x00
|
|
|
|
|
|
class Socks4Command(object):
|
|
CMD_CONNECT = 0x01
|
|
CMD_BIND = 0x02
|
|
|
|
|
|
class Socks5Command(Socks4Command):
|
|
CMD_UDP_ASSOCIATE = 0x03
|
|
|
|
|
|
class Socks5Auth(object):
|
|
AUTH_NONE = 0x00
|
|
AUTH_GSSAPI = 0x01
|
|
AUTH_USER_PASS = 0x02
|
|
AUTH_NO_ACCEPTABLE = 0xFF # For server response
|
|
|
|
|
|
class Socks5AddressType(object):
|
|
ATYP_IPV4 = 0x01
|
|
ATYP_DOMAINNAME = 0x03
|
|
ATYP_IPV6 = 0x04
|
|
|
|
|
|
class ProxyError(socket.error):
|
|
ERR_SUCCESS = 0x00
|
|
|
|
def __init__(self, code=None, msg=None):
|
|
if code is not None and msg is None:
|
|
msg = self.CODES.get(code) or 'unknown error'
|
|
super(ProxyError, self).__init__(code, msg)
|
|
|
|
|
|
class InvalidVersionError(ProxyError):
|
|
def __init__(self, expected_version, got_version):
|
|
msg = ('Invalid response version from server. Expected {0:02x} got '
|
|
'{1:02x}'.format(expected_version, got_version))
|
|
super(InvalidVersionError, self).__init__(0, msg)
|
|
|
|
|
|
class Socks4Error(ProxyError):
|
|
ERR_SUCCESS = 90
|
|
|
|
CODES = {
|
|
91: 'request rejected or failed',
|
|
92: 'request rejected because SOCKS server cannot connect to identd on the client',
|
|
93: 'request rejected because the client program and identd report different user-ids'
|
|
}
|
|
|
|
|
|
class Socks5Error(ProxyError):
|
|
ERR_GENERAL_FAILURE = 0x01
|
|
|
|
CODES = {
|
|
0x01: 'general SOCKS server failure',
|
|
0x02: 'connection not allowed by ruleset',
|
|
0x03: 'Network unreachable',
|
|
0x04: 'Host unreachable',
|
|
0x05: 'Connection refused',
|
|
0x06: 'TTL expired',
|
|
0x07: 'Command not supported',
|
|
0x08: 'Address type not supported',
|
|
0xFE: 'unknown username or invalid password',
|
|
0xFF: 'all offered authentication methods were rejected'
|
|
}
|
|
|
|
|
|
class ProxyType(object):
|
|
SOCKS4 = 0
|
|
SOCKS4A = 1
|
|
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
|
|
super(sockssocket, self).__init__(*args, **kwargs)
|
|
|
|
def setproxy(self, proxytype, addr, port, rdns=True, username=None, password=None):
|
|
assert proxytype in (ProxyType.SOCKS4, ProxyType.SOCKS4A, ProxyType.SOCKS5)
|
|
|
|
self._proxy = Proxy(proxytype, addr, port, username, password, rdns)
|
|
|
|
def recvall(self, cnt):
|
|
data = b''
|
|
while len(data) < cnt:
|
|
cur = self.recv(cnt - len(data))
|
|
if not cur:
|
|
raise EOFError('{0} bytes missing'.format(cnt - len(data)))
|
|
data += cur
|
|
return data
|
|
|
|
def _recv_bytes(self, cnt):
|
|
data = self.recvall(cnt)
|
|
return compat_struct_unpack('!{0}B'.format(cnt), data)
|
|
|
|
@staticmethod
|
|
def _len_and_data(data):
|
|
return compat_struct_pack('!B', len(data)) + data
|
|
|
|
def _check_response_version(self, expected_version, got_version):
|
|
if got_version != expected_version:
|
|
self.close()
|
|
raise InvalidVersionError(expected_version, got_version)
|
|
|
|
def _resolve_address(self, destaddr, default, use_remote_dns):
|
|
try:
|
|
return socket.inet_aton(destaddr)
|
|
except socket.error:
|
|
if use_remote_dns and self._proxy.remote_dns:
|
|
return default
|
|
else:
|
|
return socket.inet_aton(socket.gethostbyname(destaddr))
|
|
|
|
def _setup_socks4(self, address, is_4a=False):
|
|
destaddr, port = address
|
|
|
|
ipaddr = self._resolve_address(destaddr, SOCKS4_DEFAULT_DSTIP, use_remote_dns=is_4a)
|
|
|
|
packet = compat_struct_pack('!BBH', SOCKS4_VERSION, Socks4Command.CMD_CONNECT, port) + ipaddr
|
|
|
|
username = (self._proxy.username or '').encode('utf-8')
|
|
packet += username + b'\x00'
|
|
|
|
if is_4a and self._proxy.remote_dns:
|
|
packet += destaddr.encode('utf-8') + b'\x00'
|
|
|
|
self.sendall(packet)
|
|
|
|
version, resp_code, dstport, dsthost = compat_struct_unpack('!BBHI', self.recvall(8))
|
|
|
|
self._check_response_version(SOCKS4_REPLY_VERSION, version)
|
|
|
|
if resp_code != Socks4Error.ERR_SUCCESS:
|
|
self.close()
|
|
raise Socks4Error(resp_code)
|
|
|
|
return (dsthost, dstport)
|
|
|
|
def _setup_socks4a(self, address):
|
|
self._setup_socks4(address, is_4a=True)
|
|
|
|
def _socks5_auth(self):
|
|
packet = compat_struct_pack('!B', SOCKS5_VERSION)
|
|
|
|
auth_methods = [Socks5Auth.AUTH_NONE]
|
|
if self._proxy.username and self._proxy.password:
|
|
auth_methods.append(Socks5Auth.AUTH_USER_PASS)
|
|
|
|
packet += compat_struct_pack('!B', len(auth_methods))
|
|
packet += compat_struct_pack('!{0}B'.format(len(auth_methods)), *auth_methods)
|
|
|
|
self.sendall(packet)
|
|
|
|
version, method = self._recv_bytes(2)
|
|
|
|
self._check_response_version(SOCKS5_VERSION, version)
|
|
|
|
if method == Socks5Auth.AUTH_NO_ACCEPTABLE or (
|
|
method == Socks5Auth.AUTH_USER_PASS and (not self._proxy.username or not self._proxy.password)):
|
|
self.close()
|
|
raise Socks5Error(Socks5Auth.AUTH_NO_ACCEPTABLE)
|
|
|
|
if method == Socks5Auth.AUTH_USER_PASS:
|
|
username = self._proxy.username.encode('utf-8')
|
|
password = self._proxy.password.encode('utf-8')
|
|
packet = compat_struct_pack('!B', SOCKS5_USER_AUTH_VERSION)
|
|
packet += self._len_and_data(username) + self._len_and_data(password)
|
|
self.sendall(packet)
|
|
|
|
version, status = self._recv_bytes(2)
|
|
|
|
self._check_response_version(SOCKS5_USER_AUTH_VERSION, version)
|
|
|
|
if status != SOCKS5_USER_AUTH_SUCCESS:
|
|
self.close()
|
|
raise Socks5Error(Socks5Error.ERR_GENERAL_FAILURE)
|
|
|
|
def _setup_socks5(self, address):
|
|
destaddr, port = address
|
|
|
|
ipaddr = self._resolve_address(destaddr, None, use_remote_dns=True)
|
|
|
|
self._socks5_auth()
|
|
|
|
reserved = 0
|
|
packet = compat_struct_pack('!BBB', SOCKS5_VERSION, Socks5Command.CMD_CONNECT, reserved)
|
|
if ipaddr is None:
|
|
destaddr = destaddr.encode('utf-8')
|
|
packet += compat_struct_pack('!B', Socks5AddressType.ATYP_DOMAINNAME)
|
|
packet += self._len_and_data(destaddr)
|
|
else:
|
|
packet += compat_struct_pack('!B', Socks5AddressType.ATYP_IPV4) + ipaddr
|
|
packet += compat_struct_pack('!H', port)
|
|
|
|
self.sendall(packet)
|
|
|
|
version, status, reserved, atype = self._recv_bytes(4)
|
|
|
|
self._check_response_version(SOCKS5_VERSION, version)
|
|
|
|
if status != Socks5Error.ERR_SUCCESS:
|
|
self.close()
|
|
raise Socks5Error(status)
|
|
|
|
if atype == Socks5AddressType.ATYP_IPV4:
|
|
destaddr = self.recvall(4)
|
|
elif atype == Socks5AddressType.ATYP_DOMAINNAME:
|
|
alen = compat_ord(self.recv(1))
|
|
destaddr = self.recvall(alen)
|
|
elif atype == Socks5AddressType.ATYP_IPV6:
|
|
destaddr = self.recvall(16)
|
|
destport = compat_struct_unpack('!H', self.recvall(2))[0]
|
|
|
|
return (destaddr, destport)
|
|
|
|
def _make_proxy(self, connect_func, address):
|
|
if not self._proxy:
|
|
return connect_func(self, address)
|
|
|
|
result = connect_func(self, (self._proxy.host, self._proxy.port))
|
|
if result != 0 and result is not None:
|
|
return result
|
|
setup_funcs = {
|
|
ProxyType.SOCKS4: self._setup_socks4,
|
|
ProxyType.SOCKS4A: self._setup_socks4a,
|
|
ProxyType.SOCKS5: self._setup_socks5,
|
|
}
|
|
setup_funcs[self._proxy.type](address)
|
|
return result
|
|
|
|
def connect(self, address):
|
|
self._make_proxy(socket.socket.connect, address)
|
|
|
|
def connect_ex(self, address):
|
|
return self._make_proxy(socket.socket.connect_ex, address)
|