track embedded python distribution

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diff --git a/python/socks.py b/python/socks.py
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+"""SocksiPy - Python SOCKS module.
+
+Copyright 2006 Dan-Haim. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+3. Neither the name of Dan Haim nor the names of his contributors may be used
+   to endorse or promote products derived from this software without specific
+   prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY DAN HAIM "AS IS" AND ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+EVENT SHALL DAN HAIM OR HIS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA
+OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+This module provides a standard socket-like interface for Python
+for tunneling connections through SOCKS proxies.
+
+===============================================================================
+
+Minor modifications made by Christopher Gilbert (http://motomastyle.com/)
+for use in PyLoris (http://pyloris.sourceforge.net/)
+
+Minor modifications made by Mario Vilas (http://breakingcode.wordpress.com/)
+mainly to merge bug fixes found in Sourceforge
+
+Modifications made by Anorov (https://github.com/Anorov)
+-Forked and renamed to PySocks
+-Fixed issue with HTTP proxy failure checking (same bug that was in the
+ old ___recvall() method)
+-Included SocksiPyHandler (sockshandler.py), to be used as a urllib2 handler,
+ courtesy of e000 (https://github.com/e000):
+ https://gist.github.com/869791#file_socksipyhandler.py
+-Re-styled code to make it readable
+    -Aliased PROXY_TYPE_SOCKS5 -> SOCKS5 etc.
+    -Improved exception handling and output
+    -Removed irritating use of sequence indexes, replaced with tuple unpacked
+     variables
+    -Fixed up Python 3 bytestring handling - chr(0x03).encode() -> b"\x03"
+    -Other general fixes
+-Added clarification that the HTTP proxy connection method only supports
+ CONNECT-style tunneling HTTP proxies
+-Various small bug fixes
+"""
+
+from base64 import b64encode
+from collections import Callable
+from errno import EOPNOTSUPP, EINVAL, EAGAIN
+import functools
+from io import BytesIO
+import logging
+import os
+from os import SEEK_CUR
+import socket
+import struct
+import sys
+
+__version__ = "1.6.7"
+
+
+if os.name == "nt" and sys.version_info < (3, 0):
+    try:
+        import win_inet_pton
+    except ImportError:
+        raise ImportError(
+            "To run PySocks on Windows you must install win_inet_pton")
+
+log = logging.getLogger(__name__)
+
+PROXY_TYPE_SOCKS4 = SOCKS4 = 1
+PROXY_TYPE_SOCKS5 = SOCKS5 = 2
+PROXY_TYPE_HTTP = HTTP = 3
+
+PROXY_TYPES = {"SOCKS4": SOCKS4, "SOCKS5": SOCKS5, "HTTP": HTTP}
+PRINTABLE_PROXY_TYPES = dict(zip(PROXY_TYPES.values(), PROXY_TYPES.keys()))
+
+_orgsocket = _orig_socket = socket.socket
+
+
+def set_self_blocking(function):
+
+    @functools.wraps(function)
+    def wrapper(*args, **kwargs):
+        self = args[0]
+        try:
+            _is_blocking = self.gettimeout()
+            if _is_blocking == 0:
+                self.setblocking(True)
+            return function(*args, **kwargs)
+        except Exception as e:
+            raise
+        finally:
+            # set orgin blocking
+            if _is_blocking == 0:
+                self.setblocking(False)
+    return wrapper
+
+
+class ProxyError(IOError):
+    """Socket_err contains original socket.error exception."""
+    def __init__(self, msg, socket_err=None):
+        self.msg = msg
+        self.socket_err = socket_err
+
+        if socket_err:
+            self.msg += ": {0}".format(socket_err)
+
+    def __str__(self):
+        return self.msg
+
+
+class GeneralProxyError(ProxyError):
+    pass
+
+
+class ProxyConnectionError(ProxyError):
+    pass
+
+
+class SOCKS5AuthError(ProxyError):
+    pass
+
+
+class SOCKS5Error(ProxyError):
+    pass
+
+
+class SOCKS4Error(ProxyError):
+    pass
+
+
+class HTTPError(ProxyError):
+    pass
+
+SOCKS4_ERRORS = {
+    0x5B: "Request rejected or failed",
+    0x5C: ("Request rejected because SOCKS server cannot connect to identd on"
+           " the client"),
+    0x5D: ("Request rejected because the client program and identd report"
+           " different user-ids")
+}
+
+SOCKS5_ERRORS = {
+    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, or protocol error",
+    0x08: "Address type not supported"
+}
+
+DEFAULT_PORTS = {SOCKS4: 1080, SOCKS5: 1080, HTTP: 8080}
+
+
+def set_default_proxy(proxy_type=None, addr=None, port=None, rdns=True,
+                      username=None, password=None):
+    """Sets a default proxy.
+
+    All further socksocket objects will use the default unless explicitly
+    changed. All parameters are as for socket.set_proxy()."""
+    socksocket.default_proxy = (proxy_type, addr, port, rdns,
+                                username.encode() if username else None,
+                                password.encode() if password else None)
+
+
+def setdefaultproxy(*args, **kwargs):
+    if "proxytype" in kwargs:
+        kwargs["proxy_type"] = kwargs.pop("proxytype")
+    return set_default_proxy(*args, **kwargs)
+
+
+def get_default_proxy():
+    """Returns the default proxy, set by set_default_proxy."""
+    return socksocket.default_proxy
+
+getdefaultproxy = get_default_proxy
+
+
+def wrap_module(module):
+    """Attempts to replace a module's socket library with a SOCKS socket.
+
+    Must set a default proxy using set_default_proxy(...) first. This will
+    only work on modules that import socket directly into the namespace;
+    most of the Python Standard Library falls into this category."""
+    if socksocket.default_proxy:
+        module.socket.socket = socksocket
+    else:
+        raise GeneralProxyError("No default proxy specified")
+
+wrapmodule = wrap_module
+
+
+def create_connection(dest_pair,
+                      timeout=None, source_address=None,
+                      proxy_type=None, proxy_addr=None,
+                      proxy_port=None, proxy_rdns=True,
+                      proxy_username=None, proxy_password=None,
+                      socket_options=None):
+    """create_connection(dest_pair, *[, timeout], **proxy_args) -> socket object
+
+    Like socket.create_connection(), but connects to proxy
+    before returning the socket object.
+
+    dest_pair - 2-tuple of (IP/hostname, port).
+    **proxy_args - Same args passed to socksocket.set_proxy() if present.
+    timeout - Optional socket timeout value, in seconds.
+    source_address - tuple (host, port) for the socket to bind to as its source
+    address before connecting (only for compatibility)
+    """
+    # Remove IPv6 brackets on the remote address and proxy address.
+    remote_host, remote_port = dest_pair
+    if remote_host.startswith("["):
+        remote_host = remote_host.strip("[]")
+    if proxy_addr and proxy_addr.startswith("["):
+        proxy_addr = proxy_addr.strip("[]")
+
+    err = None
+
+    # Allow the SOCKS proxy to be on IPv4 or IPv6 addresses.
+    for r in socket.getaddrinfo(proxy_addr, proxy_port, 0, socket.SOCK_STREAM):
+        family, socket_type, proto, canonname, sa = r
+        sock = None
+        try:
+            sock = socksocket(family, socket_type, proto)
+
+            if socket_options:
+                for opt in socket_options:
+                    sock.setsockopt(*opt)
+
+            if isinstance(timeout, (int, float)):
+                sock.settimeout(timeout)
+
+            if proxy_type:
+                sock.set_proxy(proxy_type, proxy_addr, proxy_port, proxy_rdns,
+                               proxy_username, proxy_password)
+            if source_address:
+                sock.bind(source_address)
+
+            sock.connect((remote_host, remote_port))
+            return sock
+
+        except (socket.error, ProxyConnectionError) as e:
+            err = e
+            if sock:
+                sock.close()
+                sock = None
+
+    if err:
+        raise err
+
+    raise socket.error("gai returned empty list.")
+
+
+class _BaseSocket(socket.socket):
+    """Allows Python 2 delegated methods such as send() to be overridden."""
+    def __init__(self, *pos, **kw):
+        _orig_socket.__init__(self, *pos, **kw)
+
+        self._savedmethods = dict()
+        for name in self._savenames:
+            self._savedmethods[name] = getattr(self, name)
+            delattr(self, name)  # Allows normal overriding mechanism to work
+
+    _savenames = list()
+
+
+def _makemethod(name):
+    return lambda self, *pos, **kw: self._savedmethods[name](*pos, **kw)
+for name in ("sendto", "send", "recvfrom", "recv"):
+    method = getattr(_BaseSocket, name, None)
+
+    # Determine if the method is not defined the usual way
+    # as a function in the class.
+    # Python 2 uses __slots__, so there are descriptors for each method,
+    # but they are not functions.
+    if not isinstance(method, Callable):
+        _BaseSocket._savenames.append(name)
+        setattr(_BaseSocket, name, _makemethod(name))
+
+
+class socksocket(_BaseSocket):
+    """socksocket([family[, type[, proto]]]) -> socket object
+
+    Open a SOCKS enabled socket. The parameters are the same as
+    those of the standard socket init. In order for SOCKS to work,
+    you must specify family=AF_INET and proto=0.
+    The "type" argument must be either SOCK_STREAM or SOCK_DGRAM.
+    """
+
+    default_proxy = None
+
+    def __init__(self, family=socket.AF_INET, type=socket.SOCK_STREAM,
+                 proto=0, *args, **kwargs):
+        if type not in (socket.SOCK_STREAM, socket.SOCK_DGRAM):
+            msg = "Socket type must be stream or datagram, not {!r}"
+            raise ValueError(msg.format(type))
+
+        super(socksocket, self).__init__(family, type, proto, *args, **kwargs)
+        self._proxyconn = None  # TCP connection to keep UDP relay alive
+
+        if self.default_proxy:
+            self.proxy = self.default_proxy
+        else:
+            self.proxy = (None, None, None, None, None, None)
+        self.proxy_sockname = None
+        self.proxy_peername = None
+
+        self._timeout = None
+
+    def _readall(self, file, count):
+        """Receive EXACTLY the number of bytes requested from the file object.
+
+        Blocks until the required number of bytes have been received."""
+        data = b""
+        while len(data) < count:
+            d = file.read(count - len(data))
+            if not d:
+                raise GeneralProxyError("Connection closed unexpectedly")
+            data += d
+        return data
+
+    def settimeout(self, timeout):
+        self._timeout = timeout
+        try:
+            # test if we're connected, if so apply timeout
+            peer = self.get_proxy_peername()
+            super(socksocket, self).settimeout(self._timeout)
+        except socket.error:
+            pass
+
+    def gettimeout(self):
+        return self._timeout
+
+    def setblocking(self, v):
+        if v:
+            self.settimeout(None)
+        else:
+            self.settimeout(0.0)
+
+    def set_proxy(self, proxy_type=None, addr=None, port=None, rdns=True,
+                  username=None, password=None):
+        """ Sets the proxy to be used.
+
+        proxy_type -  The type of the proxy to be used. Three types
+                        are supported: PROXY_TYPE_SOCKS4 (including socks4a),
+                        PROXY_TYPE_SOCKS5 and PROXY_TYPE_HTTP
+        addr -        The address of the server (IP or DNS).
+        port -        The port of the server. Defaults to 1080 for SOCKS
+                        servers and 8080 for HTTP proxy servers.
+        rdns -        Should DNS queries be performed on the remote side
+                       (rather than the local side). The default is True.
+                       Note: This has no effect with SOCKS4 servers.
+        username -    Username to authenticate with to the server.
+                       The default is no authentication.
+        password -    Password to authenticate with to the server.
+                       Only relevant when username is also provided."""
+        self.proxy = (proxy_type, addr, port, rdns,
+                      username.encode() if username else None,
+                      password.encode() if password else None)
+
+    def setproxy(self, *args, **kwargs):
+        if "proxytype" in kwargs:
+            kwargs["proxy_type"] = kwargs.pop("proxytype")
+        return self.set_proxy(*args, **kwargs)
+
+    def bind(self, *pos, **kw):
+        """Implements proxy connection for UDP sockets.
+
+        Happens during the bind() phase."""
+        (proxy_type, proxy_addr, proxy_port, rdns, username,
+         password) = self.proxy
+        if not proxy_type or self.type != socket.SOCK_DGRAM:
+            return _orig_socket.bind(self, *pos, **kw)
+
+        if self._proxyconn:
+            raise socket.error(EINVAL, "Socket already bound to an address")
+        if proxy_type != SOCKS5:
+            msg = "UDP only supported by SOCKS5 proxy type"
+            raise socket.error(EOPNOTSUPP, msg)
+        super(socksocket, self).bind(*pos, **kw)
+
+        # Need to specify actual local port because
+        # some relays drop packets if a port of zero is specified.
+        # Avoid specifying host address in case of NAT though.
+        _, port = self.getsockname()
+        dst = ("0", port)
+
+        self._proxyconn = _orig_socket()
+        proxy = self._proxy_addr()
+        self._proxyconn.connect(proxy)
+
+        UDP_ASSOCIATE = b"\x03"
+        _, relay = self._SOCKS5_request(self._proxyconn, UDP_ASSOCIATE, dst)
+
+        # The relay is most likely on the same host as the SOCKS proxy,
+        # but some proxies return a private IP address (10.x.y.z)
+        host, _ = proxy
+        _, port = relay
+        super(socksocket, self).connect((host, port))
+        super(socksocket, self).settimeout(self._timeout)
+        self.proxy_sockname = ("0.0.0.0", 0)  # Unknown
+
+    def sendto(self, bytes, *args, **kwargs):
+        if self.type != socket.SOCK_DGRAM:
+            return super(socksocket, self).sendto(bytes, *args, **kwargs)
+        if not self._proxyconn:
+            self.bind(("", 0))
+
+        address = args[-1]
+        flags = args[:-1]
+
+        header = BytesIO()
+        RSV = b"\x00\x00"
+        header.write(RSV)
+        STANDALONE = b"\x00"
+        header.write(STANDALONE)
+        self._write_SOCKS5_address(address, header)
+
+        sent = super(socksocket, self).send(header.getvalue() + bytes, *flags,
+                                            **kwargs)
+        return sent - header.tell()
+
+    def send(self, bytes, flags=0, **kwargs):
+        if self.type == socket.SOCK_DGRAM:
+            return self.sendto(bytes, flags, self.proxy_peername, **kwargs)
+        else:
+            return super(socksocket, self).send(bytes, flags, **kwargs)
+
+    def recvfrom(self, bufsize, flags=0):
+        if self.type != socket.SOCK_DGRAM:
+            return super(socksocket, self).recvfrom(bufsize, flags)
+        if not self._proxyconn:
+            self.bind(("", 0))
+
+        buf = BytesIO(super(socksocket, self).recv(bufsize + 1024, flags))
+        buf.seek(2, SEEK_CUR)
+        frag = buf.read(1)
+        if ord(frag):
+            raise NotImplementedError("Received UDP packet fragment")
+        fromhost, fromport = self._read_SOCKS5_address(buf)
+
+        if self.proxy_peername:
+            peerhost, peerport = self.proxy_peername
+            if fromhost != peerhost or peerport not in (0, fromport):
+                raise socket.error(EAGAIN, "Packet filtered")
+
+        return (buf.read(bufsize), (fromhost, fromport))
+
+    def recv(self, *pos, **kw):
+        bytes, _ = self.recvfrom(*pos, **kw)
+        return bytes
+
+    def close(self):
+        if self._proxyconn:
+            self._proxyconn.close()
+        return super(socksocket, self).close()
+
+    def get_proxy_sockname(self):
+        """Returns the bound IP address and port number at the proxy."""
+        return self.proxy_sockname
+
+    getproxysockname = get_proxy_sockname
+
+    def get_proxy_peername(self):
+        """
+        Returns the IP and port number of the proxy.
+        """
+        return self.getpeername()
+
+    getproxypeername = get_proxy_peername
+
+    def get_peername(self):
+        """Returns the IP address and port number of the destination machine.
+
+        Note: get_proxy_peername returns the proxy."""
+        return self.proxy_peername
+
+    getpeername = get_peername
+
+    def _negotiate_SOCKS5(self, *dest_addr):
+        """Negotiates a stream connection through a SOCKS5 server."""
+        CONNECT = b"\x01"
+        self.proxy_peername, self.proxy_sockname = self._SOCKS5_request(
+            self, CONNECT, dest_addr)
+
+    def _SOCKS5_request(self, conn, cmd, dst):
+        """
+        Send SOCKS5 request with given command (CMD field) and
+        address (DST field). Returns resolved DST address that was used.
+        """
+        proxy_type, addr, port, rdns, username, password = self.proxy
+
+        writer = conn.makefile("wb")
+        reader = conn.makefile("rb", 0)  # buffering=0 renamed in Python 3
+        try:
+            # First we'll send the authentication packages we support.
+            if username and password:
+                # The username/password details were supplied to the
+                # set_proxy method so we support the USERNAME/PASSWORD
+                # authentication (in addition to the standard none).
+                writer.write(b"\x05\x02\x00\x02")
+            else:
+                # No username/password were entered, therefore we
+                # only support connections with no authentication.
+                writer.write(b"\x05\x01\x00")
+
+            # We'll receive the server's response to determine which
+            # method was selected
+            writer.flush()
+            chosen_auth = self._readall(reader, 2)
+
+            if chosen_auth[0:1] != b"\x05":
+                # Note: string[i:i+1] is used because indexing of a bytestring
+                # via bytestring[i] yields an integer in Python 3
+                raise GeneralProxyError(
+                    "SOCKS5 proxy server sent invalid data")
+
+            # Check the chosen authentication method
+
+            if chosen_auth[1:2] == b"\x02":
+                # Okay, we need to perform a basic username/password
+                # authentication.
+                writer.write(b"\x01" + chr(len(username)).encode()
+                             + username
+                             + chr(len(password)).encode()
+                             + password)
+                writer.flush()
+                auth_status = self._readall(reader, 2)
+                if auth_status[0:1] != b"\x01":
+                    # Bad response
+                    raise GeneralProxyError(
+                        "SOCKS5 proxy server sent invalid data")
+                if auth_status[1:2] != b"\x00":
+                    # Authentication failed
+                    raise SOCKS5AuthError("SOCKS5 authentication failed")
+
+                # Otherwise, authentication succeeded
+
+            # No authentication is required if 0x00
+            elif chosen_auth[1:2] != b"\x00":
+                # Reaching here is always bad
+                if chosen_auth[1:2] == b"\xFF":
+                    raise SOCKS5AuthError(
+                        "All offered SOCKS5 authentication methods were"
+                        " rejected")
+                else:
+                    raise GeneralProxyError(
+                        "SOCKS5 proxy server sent invalid data")
+
+            # Now we can request the actual connection
+            writer.write(b"\x05" + cmd + b"\x00")
+            resolved = self._write_SOCKS5_address(dst, writer)
+            writer.flush()
+
+            # Get the response
+            resp = self._readall(reader, 3)
+            if resp[0:1] != b"\x05":
+                raise GeneralProxyError(
+                    "SOCKS5 proxy server sent invalid data")
+
+            status = ord(resp[1:2])
+            if status != 0x00:
+                # Connection failed: server returned an error
+                error = SOCKS5_ERRORS.get(status, "Unknown error")
+                raise SOCKS5Error("{0:#04x}: {1}".format(status, error))
+
+            # Get the bound address/port
+            bnd = self._read_SOCKS5_address(reader)
+
+            super(socksocket, self).settimeout(self._timeout)
+            return (resolved, bnd)
+        finally:
+            reader.close()
+            writer.close()
+
+    def _write_SOCKS5_address(self, addr, file):
+        """
+        Return the host and port packed for the SOCKS5 protocol,
+        and the resolved address as a tuple object.
+        """
+        host, port = addr
+        proxy_type, _, _, rdns, username, password = self.proxy
+        family_to_byte = {socket.AF_INET: b"\x01", socket.AF_INET6: b"\x04"}
+
+        # If the given destination address is an IP address, we'll
+        # use the IP address request even if remote resolving was specified.
+        # Detect whether the address is IPv4/6 directly.
+        for family in (socket.AF_INET, socket.AF_INET6):
+            try:
+                addr_bytes = socket.inet_pton(family, host)
+                file.write(family_to_byte[family] + addr_bytes)
+                host = socket.inet_ntop(family, addr_bytes)
+                file.write(struct.pack(">H", port))
+                return host, port
+            except socket.error:
+                continue
+
+        # Well it's not an IP number, so it's probably a DNS name.
+        if rdns:
+            # Resolve remotely
+            host_bytes = host.encode("idna")
+            file.write(b"\x03" + chr(len(host_bytes)).encode() + host_bytes)
+        else:
+            # Resolve locally
+            addresses = socket.getaddrinfo(host, port, socket.AF_UNSPEC,
+                                           socket.SOCK_STREAM,
+                                           socket.IPPROTO_TCP,
+                                           socket.AI_ADDRCONFIG)
+            # We can't really work out what IP is reachable, so just pick the
+            # first.
+            target_addr = addresses[0]
+            family = target_addr[0]
+            host = target_addr[4][0]
+
+            addr_bytes = socket.inet_pton(family, host)
+            file.write(family_to_byte[family] + addr_bytes)
+            host = socket.inet_ntop(family, addr_bytes)
+        file.write(struct.pack(">H", port))
+        return host, port
+
+    def _read_SOCKS5_address(self, file):
+        atyp = self._readall(file, 1)
+        if atyp == b"\x01":
+            addr = socket.inet_ntoa(self._readall(file, 4))
+        elif atyp == b"\x03":
+            length = self._readall(file, 1)
+            addr = self._readall(file, ord(length))
+        elif atyp == b"\x04":
+            addr = socket.inet_ntop(socket.AF_INET6, self._readall(file, 16))
+        else:
+            raise GeneralProxyError("SOCKS5 proxy server sent invalid data")
+
+        port = struct.unpack(">H", self._readall(file, 2))[0]
+        return addr, port
+
+    def _negotiate_SOCKS4(self, dest_addr, dest_port):
+        """Negotiates a connection through a SOCKS4 server."""
+        proxy_type, addr, port, rdns, username, password = self.proxy
+
+        writer = self.makefile("wb")
+        reader = self.makefile("rb", 0)  # buffering=0 renamed in Python 3
+        try:
+            # Check if the destination address provided is an IP address
+            remote_resolve = False
+            try:
+                addr_bytes = socket.inet_aton(dest_addr)
+            except socket.error:
+                # It's a DNS name. Check where it should be resolved.
+                if rdns:
+                    addr_bytes = b"\x00\x00\x00\x01"
+                    remote_resolve = True
+                else:
+                    addr_bytes = socket.inet_aton(
+                        socket.gethostbyname(dest_addr))
+
+            # Construct the request packet
+            writer.write(struct.pack(">BBH", 0x04, 0x01, dest_port))
+            writer.write(addr_bytes)
+
+            # The username parameter is considered userid for SOCKS4
+            if username:
+                writer.write(username)
+            writer.write(b"\x00")
+
+            # DNS name if remote resolving is required
+            # NOTE: This is actually an extension to the SOCKS4 protocol
+            # called SOCKS4A and may not be supported in all cases.
+            if remote_resolve:
+                writer.write(dest_addr.encode("idna") + b"\x00")
+            writer.flush()
+
+            # Get the response from the server
+            resp = self._readall(reader, 8)
+            if resp[0:1] != b"\x00":
+                # Bad data
+                raise GeneralProxyError(
+                    "SOCKS4 proxy server sent invalid data")
+
+            status = ord(resp[1:2])
+            if status != 0x5A:
+                # Connection failed: server returned an error
+                error = SOCKS4_ERRORS.get(status, "Unknown error")
+                raise SOCKS4Error("{0:#04x}: {1}".format(status, error))
+
+            # Get the bound address/port
+            self.proxy_sockname = (socket.inet_ntoa(resp[4:]),
+                                   struct.unpack(">H", resp[2:4])[0])
+            if remote_resolve:
+                self.proxy_peername = socket.inet_ntoa(addr_bytes), dest_port
+            else:
+                self.proxy_peername = dest_addr, dest_port
+        finally:
+            reader.close()
+            writer.close()
+
+    def _negotiate_HTTP(self, dest_addr, dest_port):
+        """Negotiates a connection through an HTTP server.
+
+        NOTE: This currently only supports HTTP CONNECT-style proxies."""
+        proxy_type, addr, port, rdns, username, password = self.proxy
+
+        # If we need to resolve locally, we do this now
+        addr = dest_addr if rdns else socket.gethostbyname(dest_addr)
+
+        http_headers = [
+            (b"CONNECT " + addr.encode("idna") + b":"
+             + str(dest_port).encode() + b" HTTP/1.1"),
+            b"Host: " + dest_addr.encode("idna")
+        ]
+
+        if username and password:
+            http_headers.append(b"Proxy-Authorization: basic "
+                                + b64encode(username + b":" + password))
+
+        http_headers.append(b"\r\n")
+
+        self.sendall(b"\r\n".join(http_headers))
+
+        # We just need the first line to check if the connection was successful
+        fobj = self.makefile()
+        status_line = fobj.readline()
+        fobj.close()
+
+        if not status_line:
+            raise GeneralProxyError("Connection closed unexpectedly")
+
+        try:
+            proto, status_code, status_msg = status_line.split(" ", 2)
+        except ValueError:
+            raise GeneralProxyError("HTTP proxy server sent invalid response")
+
+        if not proto.startswith("HTTP/"):
+            raise GeneralProxyError(
+                "Proxy server does not appear to be an HTTP proxy")
+
+        try:
+            status_code = int(status_code)
+        except ValueError:
+            raise HTTPError(
+                "HTTP proxy server did not return a valid HTTP status")
+
+        if status_code != 200:
+            error = "{0}: {1}".format(status_code, status_msg)
+            if status_code in (400, 403, 405):
+                # It's likely that the HTTP proxy server does not support the
+                # CONNECT tunneling method
+                error += ("\n[*] Note: The HTTP proxy server may not be"
+                          " supported by PySocks (must be a CONNECT tunnel"
+                          " proxy)")
+            raise HTTPError(error)
+
+        self.proxy_sockname = (b"0.0.0.0", 0)
+        self.proxy_peername = addr, dest_port
+
+    _proxy_negotiators = {
+                           SOCKS4: _negotiate_SOCKS4,
+                           SOCKS5: _negotiate_SOCKS5,
+                           HTTP: _negotiate_HTTP
+                         }
+
+    @set_self_blocking
+    def connect(self, dest_pair):
+        """
+        Connects to the specified destination through a proxy.
+        Uses the same API as socket's connect().
+        To select the proxy server, use set_proxy().
+
+        dest_pair - 2-tuple of (IP/hostname, port).
+        """
+        if len(dest_pair) != 2 or dest_pair[0].startswith("["):
+            # Probably IPv6, not supported -- raise an error, and hope
+            # Happy Eyeballs (RFC6555) makes sure at least the IPv4
+            # connection works...
+            raise socket.error("PySocks doesn't support IPv6: %s"
+                               % str(dest_pair))
+
+        dest_addr, dest_port = dest_pair
+
+        if self.type == socket.SOCK_DGRAM:
+            if not self._proxyconn:
+                self.bind(("", 0))
+            dest_addr = socket.gethostbyname(dest_addr)
+
+            # If the host address is INADDR_ANY or similar, reset the peer
+            # address so that packets are received from any peer
+            if dest_addr == "0.0.0.0" and not dest_port:
+                self.proxy_peername = None
+            else:
+                self.proxy_peername = (dest_addr, dest_port)
+            return
+
+        (proxy_type, proxy_addr, proxy_port, rdns, username,
+         password) = self.proxy
+
+        # Do a minimal input check first
+        if (not isinstance(dest_pair, (list, tuple))
+                or len(dest_pair) != 2
+                or not dest_addr
+                or not isinstance(dest_port, int)):
+            # Inputs failed, raise an error
+            raise GeneralProxyError(
+                "Invalid destination-connection (host, port) pair")
+
+        # We set the timeout here so that we don't hang in connection or during
+        # negotiation.
+        super(socksocket, self).settimeout(self._timeout)
+
+        if proxy_type is None:
+            # Treat like regular socket object
+            self.proxy_peername = dest_pair
+            super(socksocket, self).settimeout(self._timeout)
+            super(socksocket, self).connect((dest_addr, dest_port))
+            return
+
+        proxy_addr = self._proxy_addr()
+
+        try:
+            # Initial connection to proxy server.
+            super(socksocket, self).connect(proxy_addr)
+
+        except socket.error as error:
+            # Error while connecting to proxy
+            self.close()
+            proxy_addr, proxy_port = proxy_addr
+            proxy_server = "{0}:{1}".format(proxy_addr, proxy_port)
+            printable_type = PRINTABLE_PROXY_TYPES[proxy_type]
+
+            msg = "Error connecting to {0} proxy {1}".format(printable_type,
+                                                             proxy_server)
+            log.debug("%s due to: %s", msg, error)
+            raise ProxyConnectionError(msg, error)
+
+        else:
+            # Connected to proxy server, now negotiate
+            try:
+                # Calls negotiate_{SOCKS4, SOCKS5, HTTP}
+                negotiate = self._proxy_negotiators[proxy_type]
+                negotiate(self, dest_addr, dest_port)
+            except socket.error as error:
+                # Wrap socket errors
+                self.close()
+                raise GeneralProxyError("Socket error", error)
+            except ProxyError:
+                # Protocol error while negotiating with proxy
+                self.close()
+                raise
+
+    def _proxy_addr(self):
+        """
+        Return proxy address to connect to as tuple object
+        """
+        (proxy_type, proxy_addr, proxy_port, rdns, username,
+         password) = self.proxy
+        proxy_port = proxy_port or DEFAULT_PORTS.get(proxy_type)
+        if not proxy_port:
+            raise GeneralProxyError("Invalid proxy type")
+        return proxy_addr, proxy_port