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# sshpeer.py - ssh repository proxy class for mercurial
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#
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# Copyright 2005, 2006 Olivia Mackall <olivia@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import re
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import uuid
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from .i18n import _
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from .pycompat import getattr
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from . import (
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error,
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pycompat,
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util,
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wireprototypes,
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wireprotov1peer,
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wireprotov1server,
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)
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from .utils import (
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procutil,
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stringutil,
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urlutil,
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)
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def _serverquote(s):
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"""quote a string for the remote shell ... which we assume is sh"""
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if not s:
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return s
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if re.match(b'[a-zA-Z0-9@%_+=:,./-]*$', s):
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return s
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return b"'%s'" % s.replace(b"'", b"'\\''")
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def _forwardoutput(ui, pipe, warn=False):
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"""display all data currently available on pipe as remote output.
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This is non blocking."""
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if pipe and not pipe.closed:
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s = procutil.readpipe(pipe)
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if s:
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display = ui.warn if warn else ui.status
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for l in s.splitlines():
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display(_(b"remote: "), l, b'\n')
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class doublepipe(object):
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"""Operate a side-channel pipe in addition of a main one
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The side-channel pipe contains server output to be forwarded to the user
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input. The double pipe will behave as the "main" pipe, but will ensure the
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content of the "side" pipe is properly processed while we wait for blocking
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call on the "main" pipe.
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If large amounts of data are read from "main", the forward will cease after
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the first bytes start to appear. This simplifies the implementation
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without affecting actual output of sshpeer too much as we rarely issue
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large read for data not yet emitted by the server.
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The main pipe is expected to be a 'bufferedinputpipe' from the util module
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that handle all the os specific bits. This class lives in this module
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because it focus on behavior specific to the ssh protocol."""
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def __init__(self, ui, main, side):
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self._ui = ui
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self._main = main
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self._side = side
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def _wait(self):
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"""wait until some data are available on main or side
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return a pair of boolean (ismainready, issideready)
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(This will only wait for data if the setup is supported by `util.poll`)
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"""
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if (
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isinstance(self._main, util.bufferedinputpipe)
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and self._main.hasbuffer
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):
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# Main has data. Assume side is worth poking at.
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return True, True
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fds = [self._main.fileno(), self._side.fileno()]
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try:
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act = util.poll(fds)
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except NotImplementedError:
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# non supported yet case, assume all have data.
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act = fds
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return (self._main.fileno() in act, self._side.fileno() in act)
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def write(self, data):
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return self._call(b'write', data)
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def read(self, size):
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r = self._call(b'read', size)
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if size != 0 and not r:
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# We've observed a condition that indicates the
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# stdout closed unexpectedly. Check stderr one
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# more time and snag anything that's there before
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# letting anyone know the main part of the pipe
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# closed prematurely.
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_forwardoutput(self._ui, self._side)
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return r
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def unbufferedread(self, size):
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r = self._call(b'unbufferedread', size)
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if size != 0 and not r:
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# We've observed a condition that indicates the
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# stdout closed unexpectedly. Check stderr one
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# more time and snag anything that's there before
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# letting anyone know the main part of the pipe
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# closed prematurely.
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_forwardoutput(self._ui, self._side)
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return r
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def readline(self):
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return self._call(b'readline')
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def _call(self, methname, data=None):
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"""call <methname> on "main", forward output of "side" while blocking"""
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# data can be '' or 0
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if (data is not None and not data) or self._main.closed:
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_forwardoutput(self._ui, self._side)
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return b''
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while True:
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mainready, sideready = self._wait()
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if sideready:
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_forwardoutput(self._ui, self._side)
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if mainready:
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meth = getattr(self._main, methname)
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if data is None:
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return meth()
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else:
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return meth(data)
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def close(self):
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return self._main.close()
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@property
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def closed(self):
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return self._main.closed
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def flush(self):
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return self._main.flush()
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def _cleanuppipes(ui, pipei, pipeo, pipee, warn):
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"""Clean up pipes used by an SSH connection."""
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didsomething = False
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if pipeo and not pipeo.closed:
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didsomething = True
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pipeo.close()
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if pipei and not pipei.closed:
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didsomething = True
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pipei.close()
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if pipee and not pipee.closed:
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didsomething = True
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# Try to read from the err descriptor until EOF.
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try:
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for l in pipee:
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ui.status(_(b'remote: '), l)
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except (IOError, ValueError):
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pass
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pipee.close()
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if didsomething and warn is not None:
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# Encourage explicit close of sshpeers. Closing via __del__ is
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# not very predictable when exceptions are thrown, which has led
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# to deadlocks due to a peer get gc'ed in a fork
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# We add our own stack trace, because the stacktrace when called
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# from __del__ is useless.
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ui.develwarn(b'missing close on SSH connection created at:\n%s' % warn)
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def _makeconnection(ui, sshcmd, args, remotecmd, path, sshenv=None):
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"""Create an SSH connection to a server.
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Returns a tuple of (process, stdin, stdout, stderr) for the
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spawned process.
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"""
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cmd = b'%s %s %s' % (
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sshcmd,
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args,
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procutil.shellquote(
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b'%s -R %s serve --stdio'
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% (_serverquote(remotecmd), _serverquote(path))
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),
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)
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ui.debug(b'running %s\n' % cmd)
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# no buffer allow the use of 'select'
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# feel free to remove buffering and select usage when we ultimately
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# move to threading.
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stdin, stdout, stderr, proc = procutil.popen4(cmd, bufsize=0, env=sshenv)
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return proc, stdin, stdout, stderr
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def _clientcapabilities():
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"""Return list of capabilities of this client.
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Returns a list of capabilities that are supported by this client.
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"""
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protoparams = {b'partial-pull'}
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comps = [
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e.wireprotosupport().name
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for e in util.compengines.supportedwireengines(util.CLIENTROLE)
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]
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protoparams.add(b'comp=%s' % b','.join(comps))
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return protoparams
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def _performhandshake(ui, stdin, stdout, stderr):
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def badresponse():
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# Flush any output on stderr. In general, the stderr contains errors
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# from the remote (ssh errors, some hg errors), and status indications
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# (like "adding changes"), with no current way to tell them apart.
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# Here we failed so early that it's almost certainly only errors, so
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# use warn=True so -q doesn't hide them.
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_forwardoutput(ui, stderr, warn=True)
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msg = _(b'no suitable response from remote hg')
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hint = ui.config(b'ui', b'ssherrorhint')
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raise error.RepoError(msg, hint=hint)
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# The handshake consists of sending wire protocol commands in reverse
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# order of protocol implementation and then sniffing for a response
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# to one of them.
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#
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# Those commands (from oldest to newest) are:
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#
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# ``between``
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# Asks for the set of revisions between a pair of revisions. Command
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# present in all Mercurial server implementations.
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#
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# ``hello``
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# Instructs the server to advertise its capabilities. Introduced in
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# Mercurial 0.9.1.
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#
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# ``upgrade``
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# Requests upgrade from default transport protocol version 1 to
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# a newer version. Introduced in Mercurial 4.6 as an experimental
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# feature.
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#
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# The ``between`` command is issued with a request for the null
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# range. If the remote is a Mercurial server, this request will
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# generate a specific response: ``1\n\n``. This represents the
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# wire protocol encoded value for ``\n``. We look for ``1\n\n``
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# in the output stream and know this is the response to ``between``
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# and we're at the end of our handshake reply.
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#
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# The response to the ``hello`` command will be a line with the
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# length of the value returned by that command followed by that
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# value. If the server doesn't support ``hello`` (which should be
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# rare), that line will be ``0\n``. Otherwise, the value will contain
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# RFC 822 like lines. Of these, the ``capabilities:`` line contains
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# the capabilities of the server.
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#
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# The ``upgrade`` command isn't really a command in the traditional
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# sense of version 1 of the transport because it isn't using the
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# proper mechanism for formatting insteads: instead, it just encodes
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# arguments on the line, delimited by spaces.
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#
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# The ``upgrade`` line looks like ``upgrade <token> <capabilities>``.
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# If the server doesn't support protocol upgrades, it will reply to
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# this line with ``0\n``. Otherwise, it emits an
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# ``upgraded <token> <protocol>`` line to both stdout and stderr.
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# Content immediately following this line describes additional
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# protocol and server state.
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#
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# In addition to the responses to our command requests, the server
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# may emit "banner" output on stdout. SSH servers are allowed to
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# print messages to stdout on login. Issuing commands on connection
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# allows us to flush this banner output from the server by scanning
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# for output to our well-known ``between`` command. Of course, if
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# the banner contains ``1\n\n``, this will throw off our detection.
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requestlog = ui.configbool(b'devel', b'debug.peer-request')
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# Generate a random token to help identify responses to version 2
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# upgrade request.
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token = pycompat.sysbytes(str(uuid.uuid4()))
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try:
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pairsarg = b'%s-%s' % (b'0' * 40, b'0' * 40)
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handshake = [
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b'hello\n',
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b'between\n',
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b'pairs %d\n' % len(pairsarg),
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pairsarg,
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]
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if requestlog:
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ui.debug(b'devel-peer-request: hello+between\n')
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ui.debug(b'devel-peer-request: pairs: %d bytes\n' % len(pairsarg))
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ui.debug(b'sending hello command\n')
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ui.debug(b'sending between command\n')
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stdin.write(b''.join(handshake))
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stdin.flush()
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except IOError:
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badresponse()
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# Assume version 1 of wire protocol by default.
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protoname = wireprototypes.SSHV1
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reupgraded = re.compile(b'^upgraded %s (.*)$' % stringutil.reescape(token))
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lines = [b'', b'dummy']
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max_noise = 500
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while lines[-1] and max_noise:
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try:
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l = stdout.readline()
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_forwardoutput(ui, stderr, warn=True)
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# Look for reply to protocol upgrade request. It has a token
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# in it, so there should be no false positives.
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m = reupgraded.match(l)
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if m:
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protoname = m.group(1)
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ui.debug(b'protocol upgraded to %s\n' % protoname)
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# If an upgrade was handled, the ``hello`` and ``between``
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# requests are ignored. The next output belongs to the
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# protocol, so stop scanning lines.
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break
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# Otherwise it could be a banner, ``0\n`` response if server
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# doesn't support upgrade.
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if lines[-1] == b'1\n' and l == b'\n':
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break
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if l:
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ui.debug(b'remote: ', l)
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lines.append(l)
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max_noise -= 1
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except IOError:
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badresponse()
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else:
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badresponse()
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caps = set()
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# For version 1, we should see a ``capabilities`` line in response to the
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# ``hello`` command.
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if protoname == wireprototypes.SSHV1:
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for l in reversed(lines):
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# Look for response to ``hello`` command. Scan from the back so
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# we don't misinterpret banner output as the command reply.
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if l.startswith(b'capabilities:'):
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caps.update(l[:-1].split(b':')[1].split())
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break
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# Error if we couldn't find capabilities, this means:
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#
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# 1. Remote isn't a Mercurial server
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# 2. Remote is a <0.9.1 Mercurial server
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# 3. Remote is a future Mercurial server that dropped ``hello``
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# and other attempted handshake mechanisms.
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if not caps:
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badresponse()
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# Flush any output on stderr before proceeding.
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_forwardoutput(ui, stderr, warn=True)
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return protoname, caps
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class sshv1peer(wireprotov1peer.wirepeer):
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def __init__(
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self, ui, url, proc, stdin, stdout, stderr, caps, autoreadstderr=True
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):
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"""Create a peer from an existing SSH connection.
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``proc`` is a handle on the underlying SSH process.
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``stdin``, ``stdout``, and ``stderr`` are handles on the stdio
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pipes for that process.
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``caps`` is a set of capabilities supported by the remote.
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``autoreadstderr`` denotes whether to automatically read from
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stderr and to forward its output.
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"""
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self._url = url
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self.ui = ui
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# self._subprocess is unused. Keeping a handle on the process
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# holds a reference and prevents it from being garbage collected.
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self._subprocess = proc
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# And we hook up our "doublepipe" wrapper to allow querying
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# stderr any time we perform I/O.
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if autoreadstderr:
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stdout = doublepipe(ui, util.bufferedinputpipe(stdout), stderr)
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stdin = doublepipe(ui, stdin, stderr)
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self._pipeo = stdin
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self._pipei = stdout
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self._pipee = stderr
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self._caps = caps
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self._autoreadstderr = autoreadstderr
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self._initstack = b''.join(util.getstackframes(1))
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# Commands that have a "framed" response where the first line of the
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# response contains the length of that response.
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_FRAMED_COMMANDS = {
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b'batch',
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}
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# Begin of ipeerconnection interface.
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def url(self):
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return self._url
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def local(self):
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return None
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def peer(self):
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return self
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def canpush(self):
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return True
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def close(self):
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self._cleanup()
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# End of ipeerconnection interface.
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# Begin of ipeercommands interface.
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def capabilities(self):
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return self._caps
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# End of ipeercommands interface.
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def _readerr(self):
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_forwardoutput(self.ui, self._pipee)
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def _abort(self, exception):
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self._cleanup()
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raise exception
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def _cleanup(self, warn=None):
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|
|
_cleanuppipes(self.ui, self._pipei, self._pipeo, self._pipee, warn=warn)
|
|
|
|
|
|
def __del__(self):
|
|
|
self._cleanup(warn=self._initstack)
|
|
|
|
|
|
def _sendrequest(self, cmd, args, framed=False):
|
|
|
if self.ui.debugflag and self.ui.configbool(
|
|
|
b'devel', b'debug.peer-request'
|
|
|
):
|
|
|
dbg = self.ui.debug
|
|
|
line = b'devel-peer-request: %s\n'
|
|
|
dbg(line % cmd)
|
|
|
for key, value in sorted(args.items()):
|
|
|
if not isinstance(value, dict):
|
|
|
dbg(line % b' %s: %d bytes' % (key, len(value)))
|
|
|
else:
|
|
|
for dk, dv in sorted(value.items()):
|
|
|
dbg(line % b' %s-%s: %d' % (key, dk, len(dv)))
|
|
|
self.ui.debug(b"sending %s command\n" % cmd)
|
|
|
self._pipeo.write(b"%s\n" % cmd)
|
|
|
_func, names = wireprotov1server.commands[cmd]
|
|
|
keys = names.split()
|
|
|
wireargs = {}
|
|
|
for k in keys:
|
|
|
if k == b'*':
|
|
|
wireargs[b'*'] = args
|
|
|
break
|
|
|
else:
|
|
|
wireargs[k] = args[k]
|
|
|
del args[k]
|
|
|
for k, v in sorted(pycompat.iteritems(wireargs)):
|
|
|
self._pipeo.write(b"%s %d\n" % (k, len(v)))
|
|
|
if isinstance(v, dict):
|
|
|
for dk, dv in pycompat.iteritems(v):
|
|
|
self._pipeo.write(b"%s %d\n" % (dk, len(dv)))
|
|
|
self._pipeo.write(dv)
|
|
|
else:
|
|
|
self._pipeo.write(v)
|
|
|
self._pipeo.flush()
|
|
|
|
|
|
# We know exactly how many bytes are in the response. So return a proxy
|
|
|
# around the raw output stream that allows reading exactly this many
|
|
|
# bytes. Callers then can read() without fear of overrunning the
|
|
|
# response.
|
|
|
if framed:
|
|
|
amount = self._getamount()
|
|
|
return util.cappedreader(self._pipei, amount)
|
|
|
|
|
|
return self._pipei
|
|
|
|
|
|
def _callstream(self, cmd, **args):
|
|
|
args = pycompat.byteskwargs(args)
|
|
|
return self._sendrequest(cmd, args, framed=cmd in self._FRAMED_COMMANDS)
|
|
|
|
|
|
def _callcompressable(self, cmd, **args):
|
|
|
args = pycompat.byteskwargs(args)
|
|
|
return self._sendrequest(cmd, args, framed=cmd in self._FRAMED_COMMANDS)
|
|
|
|
|
|
def _call(self, cmd, **args):
|
|
|
args = pycompat.byteskwargs(args)
|
|
|
return self._sendrequest(cmd, args, framed=True).read()
|
|
|
|
|
|
def _callpush(self, cmd, fp, **args):
|
|
|
# The server responds with an empty frame if the client should
|
|
|
# continue submitting the payload.
|
|
|
r = self._call(cmd, **args)
|
|
|
if r:
|
|
|
return b'', r
|
|
|
|
|
|
# The payload consists of frames with content followed by an empty
|
|
|
# frame.
|
|
|
for d in iter(lambda: fp.read(4096), b''):
|
|
|
self._writeframed(d)
|
|
|
self._writeframed(b"", flush=True)
|
|
|
|
|
|
# In case of success, there is an empty frame and a frame containing
|
|
|
# the integer result (as a string).
|
|
|
# In case of error, there is a non-empty frame containing the error.
|
|
|
r = self._readframed()
|
|
|
if r:
|
|
|
return b'', r
|
|
|
return self._readframed(), b''
|
|
|
|
|
|
def _calltwowaystream(self, cmd, fp, **args):
|
|
|
# The server responds with an empty frame if the client should
|
|
|
# continue submitting the payload.
|
|
|
r = self._call(cmd, **args)
|
|
|
if r:
|
|
|
# XXX needs to be made better
|
|
|
raise error.Abort(_(b'unexpected remote reply: %s') % r)
|
|
|
|
|
|
# The payload consists of frames with content followed by an empty
|
|
|
# frame.
|
|
|
for d in iter(lambda: fp.read(4096), b''):
|
|
|
self._writeframed(d)
|
|
|
self._writeframed(b"", flush=True)
|
|
|
|
|
|
return self._pipei
|
|
|
|
|
|
def _getamount(self):
|
|
|
l = self._pipei.readline()
|
|
|
if l == b'\n':
|
|
|
if self._autoreadstderr:
|
|
|
self._readerr()
|
|
|
msg = _(b'check previous remote output')
|
|
|
self._abort(error.OutOfBandError(hint=msg))
|
|
|
if self._autoreadstderr:
|
|
|
self._readerr()
|
|
|
try:
|
|
|
return int(l)
|
|
|
except ValueError:
|
|
|
self._abort(error.ResponseError(_(b"unexpected response:"), l))
|
|
|
|
|
|
def _readframed(self):
|
|
|
size = self._getamount()
|
|
|
if not size:
|
|
|
return b''
|
|
|
|
|
|
return self._pipei.read(size)
|
|
|
|
|
|
def _writeframed(self, data, flush=False):
|
|
|
self._pipeo.write(b"%d\n" % len(data))
|
|
|
if data:
|
|
|
self._pipeo.write(data)
|
|
|
if flush:
|
|
|
self._pipeo.flush()
|
|
|
if self._autoreadstderr:
|
|
|
self._readerr()
|
|
|
|
|
|
|
|
|
def makepeer(ui, path, proc, stdin, stdout, stderr, autoreadstderr=True):
|
|
|
"""Make a peer instance from existing pipes.
|
|
|
|
|
|
``path`` and ``proc`` are stored on the eventual peer instance and may
|
|
|
not be used for anything meaningful.
|
|
|
|
|
|
``stdin``, ``stdout``, and ``stderr`` are the pipes connected to the
|
|
|
SSH server's stdio handles.
|
|
|
|
|
|
This function is factored out to allow creating peers that don't
|
|
|
actually spawn a new process. It is useful for starting SSH protocol
|
|
|
servers and clients via non-standard means, which can be useful for
|
|
|
testing.
|
|
|
"""
|
|
|
try:
|
|
|
protoname, caps = _performhandshake(ui, stdin, stdout, stderr)
|
|
|
except Exception:
|
|
|
_cleanuppipes(ui, stdout, stdin, stderr, warn=None)
|
|
|
raise
|
|
|
|
|
|
if protoname == wireprototypes.SSHV1:
|
|
|
return sshv1peer(
|
|
|
ui,
|
|
|
path,
|
|
|
proc,
|
|
|
stdin,
|
|
|
stdout,
|
|
|
stderr,
|
|
|
caps,
|
|
|
autoreadstderr=autoreadstderr,
|
|
|
)
|
|
|
else:
|
|
|
_cleanuppipes(ui, stdout, stdin, stderr, warn=None)
|
|
|
raise error.RepoError(
|
|
|
_(b'unknown version of SSH protocol: %s') % protoname
|
|
|
)
|
|
|
|
|
|
|
|
|
def instance(ui, path, create, intents=None, createopts=None):
|
|
|
"""Create an SSH peer.
|
|
|
|
|
|
The returned object conforms to the ``wireprotov1peer.wirepeer`` interface.
|
|
|
"""
|
|
|
u = urlutil.url(path, parsequery=False, parsefragment=False)
|
|
|
if u.scheme != b'ssh' or not u.host or u.path is None:
|
|
|
raise error.RepoError(_(b"couldn't parse location %s") % path)
|
|
|
|
|
|
urlutil.checksafessh(path)
|
|
|
|
|
|
if u.passwd is not None:
|
|
|
raise error.RepoError(_(b'password in URL not supported'))
|
|
|
|
|
|
sshcmd = ui.config(b'ui', b'ssh')
|
|
|
remotecmd = ui.config(b'ui', b'remotecmd')
|
|
|
sshaddenv = dict(ui.configitems(b'sshenv'))
|
|
|
sshenv = procutil.shellenviron(sshaddenv)
|
|
|
remotepath = u.path or b'.'
|
|
|
|
|
|
args = procutil.sshargs(sshcmd, u.host, u.user, u.port)
|
|
|
|
|
|
if create:
|
|
|
# We /could/ do this, but only if the remote init command knows how to
|
|
|
# handle them. We don't yet make any assumptions about that. And without
|
|
|
# querying the remote, there's no way of knowing if the remote even
|
|
|
# supports said requested feature.
|
|
|
if createopts:
|
|
|
raise error.RepoError(
|
|
|
_(
|
|
|
b'cannot create remote SSH repositories '
|
|
|
b'with extra options'
|
|
|
)
|
|
|
)
|
|
|
|
|
|
cmd = b'%s %s %s' % (
|
|
|
sshcmd,
|
|
|
args,
|
|
|
procutil.shellquote(
|
|
|
b'%s init %s'
|
|
|
% (_serverquote(remotecmd), _serverquote(remotepath))
|
|
|
),
|
|
|
)
|
|
|
ui.debug(b'running %s\n' % cmd)
|
|
|
res = ui.system(cmd, blockedtag=b'sshpeer', environ=sshenv)
|
|
|
if res != 0:
|
|
|
raise error.RepoError(_(b'could not create remote repo'))
|
|
|
|
|
|
proc, stdin, stdout, stderr = _makeconnection(
|
|
|
ui, sshcmd, args, remotecmd, remotepath, sshenv
|
|
|
)
|
|
|
|
|
|
peer = makepeer(ui, path, proc, stdin, stdout, stderr)
|
|
|
|
|
|
# Finally, if supported by the server, notify it about our own
|
|
|
# capabilities.
|
|
|
if b'protocaps' in peer.capabilities():
|
|
|
try:
|
|
|
peer._call(
|
|
|
b"protocaps", caps=b' '.join(sorted(_clientcapabilities()))
|
|
|
)
|
|
|
except IOError:
|
|
|
peer._cleanup()
|
|
|
raise error.RepoError(_(b'capability exchange failed'))
|
|
|
|
|
|
return peer
|
|
|
|
