author | Gregory Szorc <gregory.szorc@gmail.com> |
Mon, 17 Sep 2018 15:57:32 -0700 | |
changeset 39677 | d27fde3e023e |
parent 37785 | b4d85bc122bd |
child 43076 | 2372284d9457 |
permissions | -rw-r--r-- |
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# sshprotoext.py - Extension to test behavior of SSH protocol |
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# |
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# Copyright 2018 Gregory Szorc <gregory.szorc@gmail.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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|
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# This extension replaces the SSH server started via `hg serve --stdio`. |
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# The server behaves differently depending on environment variables. |
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|
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from __future__ import absolute_import |
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|
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from mercurial import ( |
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error, |
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extensions, |
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registrar, |
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sshpeer, |
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wireprotoserver, |
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wireprotov1server, |
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) |
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configtable = {} |
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configitem = registrar.configitem(configtable) |
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configitem(b'sshpeer', b'mode', default=None) |
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configitem(b'sshpeer', b'handshake-mode', default=None) |
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class bannerserver(wireprotoserver.sshserver): |
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"""Server that sends a banner to stdout.""" |
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def serve_forever(self): |
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for i in range(10): |
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self._fout.write(b'banner: line %d\n' % i) |
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super(bannerserver, self).serve_forever() |
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class prehelloserver(wireprotoserver.sshserver): |
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"""Tests behavior when connecting to <0.9.1 servers. |
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The ``hello`` wire protocol command was introduced in Mercurial |
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0.9.1. Modern clients send the ``hello`` command when connecting |
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to SSH servers. This mock server tests behavior of the handshake |
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when ``hello`` is not supported. |
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""" |
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def serve_forever(self): |
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l = self._fin.readline() |
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assert l == b'hello\n' |
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# Respond to unknown commands with an empty reply. |
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wireprotoserver._sshv1respondbytes(self._fout, b'') |
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l = self._fin.readline() |
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assert l == b'between\n' |
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proto = wireprotoserver.sshv1protocolhandler(self._ui, self._fin, |
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self._fout) |
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rsp = wireprotov1server.dispatch(self._repo, proto, b'between') |
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wireprotoserver._sshv1respondbytes(self._fout, rsp.data) |
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super(prehelloserver, self).serve_forever() |
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def performhandshake(orig, ui, stdin, stdout, stderr): |
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"""Wrapped version of sshpeer._performhandshake to send extra commands.""" |
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mode = ui.config(b'sshpeer', b'handshake-mode') |
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if mode == b'pre-no-args': |
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ui.debug(b'sending no-args command\n') |
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stdin.write(b'no-args\n') |
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stdin.flush() |
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return orig(ui, stdin, stdout, stderr) |
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elif mode == b'pre-multiple-no-args': |
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ui.debug(b'sending unknown1 command\n') |
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stdin.write(b'unknown1\n') |
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ui.debug(b'sending unknown2 command\n') |
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stdin.write(b'unknown2\n') |
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ui.debug(b'sending unknown3 command\n') |
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stdin.write(b'unknown3\n') |
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stdin.flush() |
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return orig(ui, stdin, stdout, stderr) |
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else: |
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raise error.ProgrammingError(b'unknown HANDSHAKECOMMANDMODE: %s' % |
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mode) |
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def extsetup(ui): |
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# It's easier for tests to define the server behavior via environment |
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# variables than config options. This is because `hg serve --stdio` |
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# has to be invoked with a certain form for security reasons and |
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# `dummyssh` can't just add `--config` flags to the command line. |
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servermode = ui.environ.get(b'SSHSERVERMODE') |
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if servermode == b'banner': |
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wireprotoserver.sshserver = bannerserver |
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elif servermode == b'no-hello': |
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wireprotoserver.sshserver = prehelloserver |
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elif servermode: |
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raise error.ProgrammingError(b'unknown server mode: %s' % servermode) |
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peermode = ui.config(b'sshpeer', b'mode') |
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if peermode == b'extra-handshake-commands': |
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extensions.wrapfunction(sshpeer, '_performhandshake', performhandshake) |
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elif peermode: |
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raise error.ProgrammingError(b'unknown peer mode: %s' % peermode) |