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annotate tests/sshprotoext.py @ 36065:bf676267f64f

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wireprotoserver: split ssh protocol handler and server We want to formalize the interface for protocol handlers. Today, server functionality (which is domain specific) is interleaved with protocol handling functionality (which conforms to a generic interface) in the sshserver class. This commit splits the ssh protocol handling code out of the sshserver class. Differential Revision: https://phab.mercurial-scm.org/D2080
author Gregory Szorc <gregory.szorc@gmail.com>
date Wed, 07 Feb 2018 20:17:05 -0800
parents 5767664d39a5
children 2f7290555c96
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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 wireprotoserver._sshv1respondbytes(self._fout, 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._proto, b'between')
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52 wireprotoserver._sshv1respondbytes(self._fout, 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 class upgradev2server(wireprotoserver.sshserver):
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57 """Tests behavior for clients that issue upgrade to version 2."""
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58 def serve_forever(self):
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59 name = wireprotoserver.SSHV2
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60 l = self._fin.readline()
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61 assert l.startswith(b'upgrade ')
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62 token, caps = l[:-1].split(b' ')[1:]
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63 assert caps == b'proto=%s' % name
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64
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65 # Filter hello and between requests.
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66 l = self._fin.readline()
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67 assert l == b'hello\n'
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68 l = self._fin.readline()
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69 assert l == b'between\n'
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70 l = self._fin.readline()
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71 assert l == 'pairs 81\n'
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72 self._fin.read(81)
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73
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74 # Send the upgrade response.
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75 self._fout.write(b'upgraded %s %s\n' % (token, name))
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76 servercaps = wireproto.capabilities(self._repo, self._proto)
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77 rsp = b'capabilities: %s' % servercaps
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78 self._fout.write(b'%d\n' % len(rsp))
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79 self._fout.write(rsp)
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80 self._fout.write(b'\n')
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81 self._fout.flush()
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82
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83 super(upgradev2server, self).serve_forever()
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84
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85 def performhandshake(orig, ui, stdin, stdout, stderr):
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86 """Wrapped version of sshpeer._performhandshake to send extra commands."""
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87 mode = ui.config(b'sshpeer', b'handshake-mode')
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88 if mode == b'pre-no-args':
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89 ui.debug(b'sending no-args command\n')
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90 stdin.write(b'no-args\n')
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91 stdin.flush()
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92 return orig(ui, stdin, stdout, stderr)
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93 elif mode == b'pre-multiple-no-args':
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94 ui.debug(b'sending unknown1 command\n')
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95 stdin.write(b'unknown1\n')
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96 ui.debug(b'sending unknown2 command\n')
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97 stdin.write(b'unknown2\n')
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98 ui.debug(b'sending unknown3 command\n')
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99 stdin.write(b'unknown3\n')
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100 stdin.flush()
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101 return orig(ui, stdin, stdout, stderr)
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102 else:
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103 raise error.ProgrammingError(b'unknown HANDSHAKECOMMANDMODE: %s' %
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104 mode)
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105
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106 def extsetup(ui):
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107 # It's easier for tests to define the server behavior via environment
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108 # variables than config options. This is because `hg serve --stdio`
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109 # has to be invoked with a certain form for security reasons and
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110 # `dummyssh` can't just add `--config` flags to the command line.
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111 servermode = ui.environ.get(b'SSHSERVERMODE')
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112
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113 if servermode == b'banner':
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114 wireprotoserver.sshserver = bannerserver
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115 elif servermode == b'no-hello':
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116 wireprotoserver.sshserver = prehelloserver
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117 elif servermode == b'upgradev2':
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118 wireprotoserver.sshserver = upgradev2server
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119 elif servermode:
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120 raise error.ProgrammingError(b'unknown server mode: %s' % servermode)
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121
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122 peermode = ui.config(b'sshpeer', b'mode')
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123
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124 if peermode == b'extra-handshake-commands':
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125 extensions.wrapfunction(sshpeer, '_performhandshake', performhandshake)
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126 elif peermode:
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127 raise error.ProgrammingError(b'unknown peer mode: %s' % peermode)