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annotate tests/sshprotoext.py @ 35938:80a2b8ae42a1

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sshpeer: move handshake outside of sshpeer With the handshake now performed before a peer class is instantiated, we can now instantiate a different peer class depending on the results of the handshake. Our test extension had to change to cope with the new API. Because we now issue the command via raw I/O calls and don't call _callstream(), we no longer have to register the fake command. (_callstream() uses the command registration to see what args to send). Differential Revision: https://phab.mercurial-scm.org/D2034
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 05 Feb 2018 09:14:32 -0800
parents a9cffd14aa04
children 48a3a9283f09
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1 # sshprotoext.py - Extension to test behavior of SSH protocol
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2 #
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3 # Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 # This extension replaces the SSH server started via `hg serve --stdio`.
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9 # The server behaves differently depending on environment variables.
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10
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11 from __future__ import absolute_import
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12
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13 from mercurial import (
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14 error,
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15 extensions,
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16 registrar,
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17 sshpeer,
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18 wireproto,
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19 wireprotoserver,
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20 )
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21
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22 configtable = {}
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23 configitem = registrar.configitem(configtable)
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24
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25 configitem('sshpeer', 'mode', default=None)
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26 configitem('sshpeer', 'handshake-mode', default=None)
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27
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28 class bannerserver(wireprotoserver.sshserver):
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29 """Server that sends a banner to stdout."""
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30 def serve_forever(self):
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31 for i in range(10):
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32 self._fout.write(b'banner: line %d\n' % i)
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33
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34 super(bannerserver, self).serve_forever()
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35
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36 class prehelloserver(wireprotoserver.sshserver):
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37 """Tests behavior when connecting to <0.9.1 servers.
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38
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39 The ``hello`` wire protocol command was introduced in Mercurial
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40 0.9.1. Modern clients send the ``hello`` command when connecting
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41 to SSH servers. This mock server tests behavior of the handshake
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42 when ``hello`` is not supported.
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43 """
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44 def serve_forever(self):
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45 l = self._fin.readline()
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46 assert l == b'hello\n'
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47 # Respond to unknown commands with an empty reply.
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48 self._sendresponse(b'')
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49 l = self._fin.readline()
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50 assert l == b'between\n'
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51 rsp = wireproto.dispatch(self._repo, self, b'between')
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52 self._handlers[rsp.__class__](self, rsp)
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53
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54 super(prehelloserver, self).serve_forever()
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55
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56 def performhandshake(orig, ui, stdin, stdout, stderr):
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57 """Wrapped version of sshpeer._performhandshake to send extra commands."""
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58 mode = ui.config(b'sshpeer', b'handshake-mode')
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59 if mode == b'pre-no-args':
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60 ui.debug(b'sending no-args command\n')
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61 stdin.write(b'no-args\n')
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62 stdin.flush()
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63 return orig(ui, stdin, stdout, stderr)
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64 elif mode == b'pre-multiple-no-args':
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65 ui.debug(b'sending unknown1 command\n')
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66 stdin.write(b'unknown1\n')
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67 ui.debug(b'sending unknown2 command\n')
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68 stdin.write(b'unknown2\n')
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69 ui.debug(b'sending unknown3 command\n')
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70 stdin.write(b'unknown3\n')
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71 stdin.flush()
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72 return orig(ui, stdin, stdout, stderr)
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73 else:
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74 raise error.ProgrammingError(b'unknown HANDSHAKECOMMANDMODE: %s' %
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75 mode)
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76
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77 def extsetup(ui):
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78 # It's easier for tests to define the server behavior via environment
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79 # variables than config options. This is because `hg serve --stdio`
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80 # has to be invoked with a certain form for security reasons and
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81 # `dummyssh` can't just add `--config` flags to the command line.
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82 servermode = ui.environ.get(b'SSHSERVERMODE')
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83
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84 if servermode == b'banner':
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85 wireprotoserver.sshserver = bannerserver
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86 elif servermode == b'no-hello':
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87 wireprotoserver.sshserver = prehelloserver
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88 elif servermode:
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89 raise error.ProgrammingError(b'unknown server mode: %s' % servermode)
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90
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91 peermode = ui.config(b'sshpeer', b'mode')
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92
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93 if peermode == b'extra-handshake-commands':
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94 extensions.wrapfunction(sshpeer, '_performhandshake', performhandshake)
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95 elif peermode:
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96 raise error.ProgrammingError(b'unknown peer mode: %s' % peermode)