Migrate SSH tunneling from pyzmq

jupyter_client/connect.py

@@ -35,9 +35,9 @@
 
 
 def write_connection_file(fname=None, shell_port=0, iopub_port=0, stdin_port=0, hb_port=0,
-                         control_port=0, ip='', key=b'', transport='tcp',
-                         signature_scheme='hmac-sha256', kernel_name=''
-                         ):
+                          control_port=0, ip='', key=b'', transport='tcp',
+                          signature_scheme='hmac-sha256', kernel_name=''
+                          ):
     """Generates a JSON config file, including the selection of random ports.
 
     Parameters
@@ -193,7 +193,7 @@ def find_connection_file(filename='kernel-*.json', path=None, profile=None):
         path = ['.', jupyter_runtime_dir()]
     if isinstance(path, string_types):
         path = [path]
-    
+
     try:
         # first, try explicit name
         return filefind(filename, path)
@@ -208,11 +208,11 @@ def find_connection_file(filename='kernel-*.json', path=None, profile=None):
     else:
         # accept any substring match
         pat = '*%s*' % filename
-    
+
     matches = []
     for p in path:
         matches.extend(glob.glob(os.path.join(p, pat)))
-    
+
     matches = [ os.path.abspath(m) for m in matches ]
     if not matches:
         raise IOError("Could not find %r in %r" % (filename, path))
@@ -249,7 +249,7 @@ def tunnel_to_kernel(connection_info, sshserver, sshkey=None):
     (shell, iopub, stdin, hb) : ints
         The four ports on localhost that have been forwarded to the kernel.
     """
-    from zmq.ssh import tunnel
+    from jupyter_core.ssh import tunnel
     if isinstance(connection_info, string_types):
         # it's a path, unpack it
         with open(connection_info) as f:
@@ -289,11 +289,11 @@ def tunnel_to_kernel(connection_info, sshserver, sshkey=None):
 
 class ConnectionFileMixin(LoggingConfigurable):
     """Mixin for configurable classes that work with connection files"""
-    
+
     data_dir = Unicode()
     def _data_dir_default(self):
         return jupyter_data_dir()
-    
+
     # The addresses for the communication channels
     connection_file = Unicode('', config=True,
     help="""JSON file in which to store connection info [default: kernel-<pid>.json]
@@ -480,7 +480,7 @@ def write_connection_file(self):
 
     def load_connection_file(self, connection_file=None):
         """Load connection info from JSON dict in self.connection_file.
-        
+
         Parameters
         ----------
         connection_file: unicode, optional
@@ -496,10 +496,10 @@ def load_connection_file(self, connection_file=None):
 
     def load_connection_info(self, info):
         """Load connection info from a dict containing connection info.
-        
+
         Typically this data comes from a connection file
         and is called by load_connection_file.
-        
+
         Parameters
         ----------
         info: dict

jupyter_client/ssh/__init__.py

@@ -0,0 +1 @@
+from jupyter_client.ssh.tunnel import *

jupyter_client/ssh/forward.py

@@ -0,0 +1,92 @@
+#
+# This file is adapted from a paramiko demo, and thus licensed under LGPL 2.1.
+# Original Copyright (C) 2003-2007  Robey Pointer <robeypointer@gmail.com>
+# Edits Copyright (C) 2010 The IPython Team
+#
+# Paramiko is free software; you can redistribute it and/or modify it under the
+# terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation; either version 2.1 of the License, or (at your option)
+# any later version.
+#
+# Paramiko is distrubuted in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA.
+
+"""
+Sample script showing how to do local port forwarding over paramiko.
+
+This script connects to the requested SSH server and sets up local port
+forwarding (the openssh -L option) from a local port through a tunneled
+connection to a destination reachable from the SSH server machine.
+"""
+
+from __future__ import print_function
+
+import logging
+import select
+try:  # Python 3
+    import socketserver
+except ImportError:  # Python 2
+    import SocketServer as socketserver
+
+logger = logging.getLogger('ssh')
+
+
+class ForwardServer (socketserver.ThreadingTCPServer):
+    daemon_threads = True
+    allow_reuse_address = True
+
+
+class Handler (socketserver.BaseRequestHandler):
+
+    def handle(self):
+        try:
+            chan = self.ssh_transport.open_channel('direct-tcpip',
+                                                   (self.chain_host, self.chain_port),
+                                                   self.request.getpeername())
+        except Exception as e:
+            logger.debug('Incoming request to %s:%d failed: %s' % (self.chain_host,
+                                                                   self.chain_port,
+                                                                   repr(e)))
+            return
+        if chan is None:
+            logger.debug('Incoming request to %s:%d was rejected by the SSH server.' %
+                    (self.chain_host, self.chain_port))
+            return
+
+        logger.debug('Connected!  Tunnel open %r -> %r -> %r' % (self.request.getpeername(),
+                                                            chan.getpeername(), (self.chain_host, self.chain_port)))
+        while True:
+            r, w, x = select.select([self.request, chan], [], [])
+            if self.request in r:
+                data = self.request.recv(1024)
+                if len(data) == 0:
+                    break
+                chan.send(data)
+            if chan in r:
+                data = chan.recv(1024)
+                if len(data) == 0:
+                    break
+                self.request.send(data)
+        chan.close()
+        self.request.close()
+        logger.debug('Tunnel closed ')
+
+
+def forward_tunnel(local_port, remote_host, remote_port, transport):
+    # this is a little convoluted, but lets me configure things for the Handler
+    # object.  (SocketServer doesn't give Handlers any way to access the outer
+    # server normally.)
+    class SubHander (Handler):
+        chain_host = remote_host
+        chain_port = remote_port
+        ssh_transport = transport
+    ForwardServer(('127.0.0.1', local_port), SubHander).serve_forever()
+
+
+__all__ = ['forward_tunnel']