track custom youtube-dl distribution

1 files changed, 273 insertions, 0 deletions

diff --git a/youtube_dl/socks.py b/youtube_dl/socks.py
new file mode 100644
index 0000000..5d4adbe
--- /dev/null
+++ b/youtube_dl/socks.py
@@ -0,0 +1,273 @@
+# 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)