mirror of
https://codeberg.org/polarisfm/youtube-dl
synced 2024-11-22 16:44:32 +01:00
[socks] Eliminate magic constants and improve
This commit is contained in:
Yen Chi Hsuan
parent
72f3289ac4
commit
9e9cd7248d
@ -3,37 +3,87 @@
|
||||
|
||||
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,
|
||||
struct_pack,
|
||||
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 = 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(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'
|
||||
}
|
||||
ERR_SUCCESS = 0x00
|
||||
|
||||
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)
|
||||
msg = self.CODES.get(code) and 'unknown error'
|
||||
super(ProxyError, self).__init__(code, msg)
|
||||
|
||||
|
||||
class Socks5Error(Socks4Error):
|
||||
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 becasue 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',
|
||||
@ -53,27 +103,19 @@ class ProxyType(object):
|
||||
SOCKS4A = 1
|
||||
SOCKS5 = 2
|
||||
|
||||
Proxy = collections.namedtuple('Proxy', ('type', 'host', 'port', 'username', 'password', 'remote_dns'))
|
||||
Proxy = collections.namedtuple('Proxy', (
|
||||
'type', 'host', 'port', 'username', 'password', 'remote_dns'))
|
||||
|
||||
|
||||
class sockssocket(socket.socket):
|
||||
@property
|
||||
def _proxy(self):
|
||||
return self.__proxy
|
||||
def __init__(self, *args, **kwargs):
|
||||
self._proxy = None
|
||||
super(sockssocket, self).__init__(*args, **kwargs)
|
||||
|
||||
@property
|
||||
def _proxy_port(self):
|
||||
if self._proxy:
|
||||
if self._proxy.port:
|
||||
return self._proxy.port
|
||||
return 1080
|
||||
return None
|
||||
def setproxy(self, proxytype, addr, port, rdns=True, username=None, password=None):
|
||||
assert proxytype in (ProxyType.SOCKS4, ProxyType.SOCKS4A, ProxyType.SOCKS5)
|
||||
|
||||
def setproxy(self, proxytype=None, addr=None, port=None, rdns=True, username=None, password=None):
|
||||
if proxytype is None:
|
||||
self.__proxy = None
|
||||
else:
|
||||
self.__proxy = Proxy(proxytype, addr, port, username, password, rdns)
|
||||
self._proxy = Proxy(proxytype, addr, port, username, password, rdns)
|
||||
|
||||
def recvall(self, cnt):
|
||||
data = b''
|
||||
@ -84,163 +126,146 @@ class sockssocket(socket.socket):
|
||||
data += cur
|
||||
return data
|
||||
|
||||
def _recv_bytes(self, cnt):
|
||||
data = self.recvall(cnt)
|
||||
return struct_unpack('!{0}B'.format(cnt), data)
|
||||
|
||||
@staticmethod
|
||||
def _len_and_data(data):
|
||||
return 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
|
||||
|
||||
try:
|
||||
ipaddr = socket.inet_aton(destaddr)
|
||||
except socket.error:
|
||||
if is_4a and self._proxy.remote_dns:
|
||||
ipaddr = struct_pack('!BBBB', 0, 0, 0, 0xFF)
|
||||
else:
|
||||
ipaddr = socket.inet_aton(socket.gethostbyname(destaddr))
|
||||
ipaddr = self._resolve_address(destaddr, SOCKS4_DEFAULT_DSTIP, use_remote_dns=is_4a)
|
||||
|
||||
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)
|
||||
else:
|
||||
packet += b'\x00'
|
||||
packet = 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:
|
||||
if hasattr(destaddr, 'encode'):
|
||||
destaddr = destaddr.encode()
|
||||
packet += struct_pack('!{0}s'.format(len(destaddr) + 1), destaddr)
|
||||
packet += destaddr.encode('utf-8') + b'\x00'
|
||||
|
||||
self.sendall(packet)
|
||||
|
||||
packet = self.recvall(8)
|
||||
nbyte, resp_code, dstport, dsthost = struct_unpack('!BBHI', packet)
|
||||
version, resp_code, dstport, dsthost = struct_unpack('!BBHI', self.recvall(8))
|
||||
|
||||
# check valid response
|
||||
if nbyte != 0x00:
|
||||
self.close()
|
||||
raise ProxyError(
|
||||
0, 'Invalid response from server. Expected {0:02x} got {1:02x}'.format(0, nbyte))
|
||||
self._check_response_version(SOCKS4_REPLY_VERSION, version)
|
||||
|
||||
# access granted
|
||||
if resp_code != 0x5a:
|
||||
if resp_code != Socks4Error.ERR_SUCCESS:
|
||||
self.close()
|
||||
raise Socks4Error(resp_code)
|
||||
|
||||
return (dsthost, dstport)
|
||||
|
||||
def _setup_socks5(self, address):
|
||||
destaddr, port = address
|
||||
def _setup_socks4a(self, address):
|
||||
self._setup_socks4(address, is_4a=True)
|
||||
|
||||
try:
|
||||
ipaddr = socket.inet_aton(destaddr)
|
||||
except socket.error:
|
||||
if self._proxy.remote_dns:
|
||||
ipaddr = None
|
||||
else:
|
||||
ipaddr = socket.inet_aton(socket.gethostbyname(destaddr))
|
||||
def _socks5_auth(self):
|
||||
packet = struct_pack('!B', SOCKS5_VERSION)
|
||||
|
||||
auth_methods = 1
|
||||
auth_methods = [Socks5Auth.AUTH_NONE]
|
||||
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
|
||||
if self._proxy.username and self._proxy.password:
|
||||
packet += struct_pack('!B', 0x02) # user/pass auth
|
||||
auth_methods.append(Socks5Auth.AUTH_USER_PASS)
|
||||
|
||||
packet += struct_pack('!B', len(auth_methods))
|
||||
packet += struct_pack('!{0}B'.format(len(auth_methods)), *auth_methods)
|
||||
|
||||
self.sendall(packet)
|
||||
|
||||
packet = self.recvall(2)
|
||||
version, method = struct_unpack('!BB', packet)
|
||||
version, method = self._recv_bytes(2)
|
||||
|
||||
# check valid response
|
||||
if version != 0x05:
|
||||
self.close()
|
||||
raise ProxyError(
|
||||
0, 'Invalid response from server. Expected {0:02x} got {1:02x}'.format(5, version))
|
||||
self._check_response_version(SOCKS5_VERSION, version)
|
||||
|
||||
# no auth methods
|
||||
if method == 0xFF:
|
||||
if method == Socks5Auth.AUTH_NO_ACCEPTABLE:
|
||||
self.close()
|
||||
raise Socks5Error(method)
|
||||
|
||||
# user/pass auth
|
||||
if method == 0x01:
|
||||
username = self._proxy.username
|
||||
if hasattr(username, 'encode'):
|
||||
username = username.encode()
|
||||
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
|
||||
if method == Socks5Auth.AUTH_USER_PASS:
|
||||
username = self._proxy.username.encode('utf-8')
|
||||
password = self._proxy.password.encode('utf-8')
|
||||
packet = struct_pack('!B', SOCKS5_USER_AUTH_VERSION)
|
||||
packet += self._len_and_data(username) + self._len_and_data(password)
|
||||
self.sendall(packet)
|
||||
|
||||
packet = self.recvall(2)
|
||||
version, status = struct_unpack('!BB', packet)
|
||||
version, status = self._recv_bytes(2)
|
||||
|
||||
if version != 0x01:
|
||||
self.close()
|
||||
raise ProxyError(
|
||||
0, 'Invalid response from server. Expected {0:02x} got {1:02x}'.format(1, version))
|
||||
self._check_response_version(SOCKS5_USER_AUTH_VERSION, version)
|
||||
|
||||
if status != 0x00:
|
||||
if status != SOCKS5_USER_AUTH_SUCCESS:
|
||||
self.close()
|
||||
raise Socks5Error(1)
|
||||
elif method == 0x00: # no auth
|
||||
raise Socks5Error(Socks5Error.ERR_GENERAL_FAILURE)
|
||||
elif method == Socks5Auth.AUTH_NONE:
|
||||
pass
|
||||
|
||||
packet = struct_pack('!BBB', 5, 1, 0)
|
||||
def _setup_socks5(self, address):
|
||||
destaddr, port = address
|
||||
|
||||
ipaddr = self._resolve_address(destaddr, None, use_remote_dns=True)
|
||||
|
||||
self._socks5_auth()
|
||||
|
||||
reserved = 0
|
||||
packet = struct_pack('!BBB', SOCKS5_VERSION, Socks5Command.CMD_CONNECT, reserved)
|
||||
if ipaddr is None:
|
||||
if hasattr(destaddr, 'encode'):
|
||||
destaddr = destaddr.encode()
|
||||
packet += struct_pack('!BB', 3, len(destaddr)) + destaddr
|
||||
destaddr = destaddr.encode('utf-8')
|
||||
packet += struct_pack('!B', Socks5AddressType.ATYP_DOMAINNAME)
|
||||
packet += self._len_and_data(destaddr)
|
||||
else:
|
||||
packet += struct_pack('!B', 1) + ipaddr
|
||||
packet += struct_pack('!B', Socks5AddressType.ATYP_IPV4) + ipaddr
|
||||
packet += struct_pack('!H', port)
|
||||
|
||||
self.sendall(packet)
|
||||
|
||||
packet = self.recvall(4)
|
||||
version, status, _, atype = struct_unpack('!BBBB', packet)
|
||||
version, status, reserved, atype = self._recv_bytes(4)
|
||||
|
||||
if version != 0x05:
|
||||
self.close()
|
||||
raise ProxyError(
|
||||
0, 'Invalid response from server. Expected {0:02x} got {1:02x}'.format(5, version))
|
||||
self._check_response_version(SOCKS5_VERSION, version)
|
||||
|
||||
if status != 0x00:
|
||||
if status != Socks5Error.ERR_SUCCESS:
|
||||
self.close()
|
||||
raise Socks5Error(status)
|
||||
|
||||
if atype == 0x01:
|
||||
if atype == Socks5AddressType.ATYP_IPV4:
|
||||
destaddr = self.recvall(4)
|
||||
elif atype == 0x03:
|
||||
alen = struct_unpack('!B', self.recv(1))[0]
|
||||
elif atype == Socks5AddressType.ATYP_DOMAINNAME:
|
||||
alen = compat_ord(self.recv(1))
|
||||
destaddr = self.recvall(alen)
|
||||
elif atype == 0x04:
|
||||
elif atype == Socks5AddressType.ATYP_IPV6:
|
||||
destaddr = self.recvall(16)
|
||||
destport = struct_unpack('!H', self.recvall(2))[0]
|
||||
|
||||
return (destaddr, destport)
|
||||
|
||||
def _make_proxy(self, connect_func, address):
|
||||
if self._proxy.type == ProxyType.SOCKS4:
|
||||
result = connect_func(self, (self._proxy.host, self._proxy_port))
|
||||
if result != 0 and result is not None:
|
||||
return result
|
||||
self._setup_socks4(address)
|
||||
elif self._proxy.type == ProxyType.SOCKS4A:
|
||||
result = connect_func(self, (self._proxy.host, self._proxy_port))
|
||||
if result != 0 and result is not None:
|
||||
return result
|
||||
self._setup_socks4(address, is_4a=True)
|
||||
elif self._proxy.type == ProxyType.SOCKS5:
|
||||
result = connect_func(self, (self._proxy.host, self._proxy_port))
|
||||
if result != 0 and result is not None:
|
||||
return result
|
||||
self._setup_socks5(address)
|
||||
else:
|
||||
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)
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user