Mercurial > hg
annotate mercurial/wireprotoserver.py @ 36309:94a1ff16f362
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author | Yuya Nishihara <yuya@tcha.org> |
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date | Sat, 17 Feb 2018 13:13:04 +0900 |
parents | 685bcdd236b5 |
children | 0c231df1ffdc |
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1 # Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net> |
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2 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> |
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3 # |
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4 # This software may be used and distributed according to the terms of the |
10263 | 5 # GNU General Public License version 2 or any later version. |
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6 |
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7 from __future__ import absolute_import |
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8 |
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9 import abc |
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10 import contextlib |
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11 import struct |
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12 import sys |
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13 |
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14 from .i18n import _ |
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15 from . import ( |
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16 encoding, |
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17 error, |
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18 hook, |
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19 pycompat, |
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20 util, |
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21 wireproto, |
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22 wireprototypes, |
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23 ) |
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24 |
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25 stringio = util.stringio |
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26 |
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27 urlerr = util.urlerr |
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28 urlreq = util.urlreq |
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29 |
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30 HTTP_OK = 200 |
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31 |
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32 HGTYPE = 'application/mercurial-0.1' |
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33 HGTYPE2 = 'application/mercurial-0.2' |
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34 HGERRTYPE = 'application/hg-error' |
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35 |
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36 # Names of the SSH protocol implementations. |
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37 SSHV1 = 'ssh-v1' |
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38 # This is advertised over the wire. Incremental the counter at the end |
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39 # to reflect BC breakages. |
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40 SSHV2 = 'exp-ssh-v2-0001' |
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41 |
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42 class baseprotocolhandler(object): |
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43 """Abstract base class for wire protocol handlers. |
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44 |
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45 A wire protocol handler serves as an interface between protocol command |
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46 handlers and the wire protocol transport layer. Protocol handlers provide |
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47 methods to read command arguments, redirect stdio for the duration of |
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48 the request, handle response types, etc. |
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49 """ |
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50 |
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51 __metaclass__ = abc.ABCMeta |
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52 |
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53 @abc.abstractproperty |
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54 def name(self): |
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55 """The name of the protocol implementation. |
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56 |
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57 Used for uniquely identifying the transport type. |
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58 """ |
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59 |
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60 @abc.abstractmethod |
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61 def getargs(self, args): |
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62 """return the value for arguments in <args> |
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63 |
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64 returns a list of values (same order as <args>)""" |
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65 |
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66 @abc.abstractmethod |
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67 def forwardpayload(self, fp): |
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68 """Read the raw payload and forward to a file. |
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69 |
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70 The payload is read in full before the function returns. |
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71 """ |
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72 |
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73 @abc.abstractmethod |
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74 def mayberedirectstdio(self): |
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75 """Context manager to possibly redirect stdio. |
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76 |
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77 The context manager yields a file-object like object that receives |
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78 stdout and stderr output when the context manager is active. Or it |
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79 yields ``None`` if no I/O redirection occurs. |
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80 |
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81 The intent of this context manager is to capture stdio output |
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82 so it may be sent in the response. Some transports support streaming |
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83 stdio to the client in real time. For these transports, stdio output |
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84 won't be captured. |
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85 """ |
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86 |
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87 @abc.abstractmethod |
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88 def client(self): |
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89 """Returns a string representation of this client (as bytes).""" |
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90 |
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91 def decodevaluefromheaders(req, headerprefix): |
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92 """Decode a long value from multiple HTTP request headers. |
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93 |
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94 Returns the value as a bytes, not a str. |
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95 """ |
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96 chunks = [] |
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97 i = 1 |
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98 prefix = headerprefix.upper().replace(r'-', r'_') |
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99 while True: |
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100 v = req.env.get(r'HTTP_%s_%d' % (prefix, i)) |
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101 if v is None: |
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102 break |
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103 chunks.append(pycompat.bytesurl(v)) |
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104 i += 1 |
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105 |
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106 return ''.join(chunks) |
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107 |
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108 class httpv1protocolhandler(baseprotocolhandler): |
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109 def __init__(self, req, ui): |
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110 self._req = req |
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111 self._ui = ui |
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112 |
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113 @property |
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114 def name(self): |
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115 return 'http-v1' |
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116 |
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117 def getargs(self, args): |
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118 knownargs = self._args() |
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119 data = {} |
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120 keys = args.split() |
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121 for k in keys: |
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122 if k == '*': |
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123 star = {} |
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124 for key in knownargs.keys(): |
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125 if key != 'cmd' and key not in keys: |
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126 star[key] = knownargs[key][0] |
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127 data['*'] = star |
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128 else: |
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129 data[k] = knownargs[k][0] |
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130 return [data[k] for k in keys] |
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131 |
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132 def _args(self): |
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133 args = util.rapply(pycompat.bytesurl, self._req.form.copy()) |
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134 postlen = int(self._req.env.get(r'HTTP_X_HGARGS_POST', 0)) |
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135 if postlen: |
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136 args.update(urlreq.parseqs( |
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137 self._req.read(postlen), keep_blank_values=True)) |
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138 return args |
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139 |
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140 argvalue = decodevaluefromheaders(self._req, r'X-HgArg') |
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141 args.update(urlreq.parseqs(argvalue, keep_blank_values=True)) |
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142 return args |
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143 |
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144 def forwardpayload(self, fp): |
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145 if r'HTTP_CONTENT_LENGTH' in self._req.env: |
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146 length = int(self._req.env[r'HTTP_CONTENT_LENGTH']) |
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147 else: |
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148 length = int(self._req.env[r'CONTENT_LENGTH']) |
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149 # If httppostargs is used, we need to read Content-Length |
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150 # minus the amount that was consumed by args. |
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151 length -= int(self._req.env.get(r'HTTP_X_HGARGS_POST', 0)) |
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152 for s in util.filechunkiter(self._req, limit=length): |
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153 fp.write(s) |
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154 |
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155 @contextlib.contextmanager |
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156 def mayberedirectstdio(self): |
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157 oldout = self._ui.fout |
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158 olderr = self._ui.ferr |
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159 |
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160 out = util.stringio() |
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161 |
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162 try: |
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163 self._ui.fout = out |
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164 self._ui.ferr = out |
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165 yield out |
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166 finally: |
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167 self._ui.fout = oldout |
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168 self._ui.ferr = olderr |
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169 |
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170 def client(self): |
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171 return 'remote:%s:%s:%s' % ( |
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172 self._req.env.get('wsgi.url_scheme') or 'http', |
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173 urlreq.quote(self._req.env.get('REMOTE_HOST', '')), |
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174 urlreq.quote(self._req.env.get('REMOTE_USER', ''))) |
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175 |
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176 # This method exists mostly so that extensions like remotefilelog can |
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177 # disable a kludgey legacy method only over http. As of early 2018, |
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178 # there are no other known users, so with any luck we can discard this |
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179 # hook if remotefilelog becomes a first-party extension. |
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180 def iscmd(cmd): |
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181 return cmd in wireproto.commands |
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182 |
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183 def parsehttprequest(repo, req, query): |
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184 """Parse the HTTP request for a wire protocol request. |
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185 |
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186 If the current request appears to be a wire protocol request, this |
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187 function returns a dict with details about that request, including |
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188 an ``abstractprotocolserver`` instance suitable for handling the |
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189 request. Otherwise, ``None`` is returned. |
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190 |
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191 ``req`` is a ``wsgirequest`` instance. |
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192 """ |
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193 # HTTP version 1 wire protocol requests are denoted by a "cmd" query |
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194 # string parameter. If it isn't present, this isn't a wire protocol |
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195 # request. |
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196 if r'cmd' not in req.form: |
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197 return None |
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198 |
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199 cmd = pycompat.sysbytes(req.form[r'cmd'][0]) |
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200 |
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201 # The "cmd" request parameter is used by both the wire protocol and hgweb. |
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202 # While not all wire protocol commands are available for all transports, |
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203 # if we see a "cmd" value that resembles a known wire protocol command, we |
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204 # route it to a protocol handler. This is better than routing possible |
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205 # wire protocol requests to hgweb because it prevents hgweb from using |
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206 # known wire protocol commands and it is less confusing for machine |
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207 # clients. |
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208 if not iscmd(cmd): |
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209 return None |
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210 |
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211 proto = httpv1protocolhandler(req, repo.ui) |
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212 |
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213 return { |
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214 'cmd': cmd, |
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215 'proto': proto, |
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216 'dispatch': lambda: _callhttp(repo, req, proto, cmd), |
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217 'handleerror': lambda ex: _handlehttperror(ex, req, cmd), |
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218 } |
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219 |
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220 def _httpresponsetype(ui, req, prefer_uncompressed): |
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221 """Determine the appropriate response type and compression settings. |
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222 |
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223 Returns a tuple of (mediatype, compengine, engineopts). |
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224 """ |
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225 # Determine the response media type and compression engine based |
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226 # on the request parameters. |
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227 protocaps = decodevaluefromheaders(req, r'X-HgProto').split(' ') |
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228 |
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229 if '0.2' in protocaps: |
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230 # All clients are expected to support uncompressed data. |
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231 if prefer_uncompressed: |
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232 return HGTYPE2, util._noopengine(), {} |
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233 |
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234 # Default as defined by wire protocol spec. |
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235 compformats = ['zlib', 'none'] |
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236 for cap in protocaps: |
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237 if cap.startswith('comp='): |
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238 compformats = cap[5:].split(',') |
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239 break |
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240 |
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241 # Now find an agreed upon compression format. |
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242 for engine in wireproto.supportedcompengines(ui, util.SERVERROLE): |
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243 if engine.wireprotosupport().name in compformats: |
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244 opts = {} |
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245 level = ui.configint('server', '%slevel' % engine.name()) |
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246 if level is not None: |
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247 opts['level'] = level |
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248 |
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249 return HGTYPE2, engine, opts |
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250 |
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251 # No mutually supported compression format. Fall back to the |
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252 # legacy protocol. |
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253 |
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254 # Don't allow untrusted settings because disabling compression or |
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255 # setting a very high compression level could lead to flooding |
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256 # the server's network or CPU. |
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257 opts = {'level': ui.configint('server', 'zliblevel')} |
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258 return HGTYPE, util.compengines['zlib'], opts |
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259 |
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260 def _callhttp(repo, req, proto, cmd): |
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261 def genversion2(gen, engine, engineopts): |
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262 # application/mercurial-0.2 always sends a payload header |
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263 # identifying the compression engine. |
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264 name = engine.wireprotosupport().name |
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265 assert 0 < len(name) < 256 |
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266 yield struct.pack('B', len(name)) |
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267 yield name |
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268 |
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269 for chunk in gen: |
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270 yield chunk |
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271 |
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272 rsp = wireproto.dispatch(repo, proto, cmd) |
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273 |
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274 if not wireproto.commands.commandavailable(cmd, proto): |
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275 req.respond(HTTP_OK, HGERRTYPE, |
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276 body=_('requested wire protocol command is not available ' |
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277 'over HTTP')) |
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278 return [] |
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279 |
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280 if isinstance(rsp, bytes): |
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281 req.respond(HTTP_OK, HGTYPE, body=rsp) |
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282 return [] |
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283 elif isinstance(rsp, wireprototypes.bytesresponse): |
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284 req.respond(HTTP_OK, HGTYPE, body=rsp.data) |
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285 return [] |
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286 elif isinstance(rsp, wireprototypes.streamreslegacy): |
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287 gen = rsp.gen |
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288 req.respond(HTTP_OK, HGTYPE) |
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289 return gen |
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290 elif isinstance(rsp, wireprototypes.streamres): |
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291 gen = rsp.gen |
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292 |
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293 # This code for compression should not be streamres specific. It |
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294 # is here because we only compress streamres at the moment. |
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295 mediatype, engine, engineopts = _httpresponsetype( |
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296 repo.ui, req, rsp.prefer_uncompressed) |
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297 gen = engine.compressstream(gen, engineopts) |
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298 |
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299 if mediatype == HGTYPE2: |
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300 gen = genversion2(gen, engine, engineopts) |
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301 |
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302 req.respond(HTTP_OK, mediatype) |
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303 return gen |
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304 elif isinstance(rsp, wireprototypes.pushres): |
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305 rsp = '%d\n%s' % (rsp.res, rsp.output) |
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306 req.respond(HTTP_OK, HGTYPE, body=rsp) |
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307 return [] |
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308 elif isinstance(rsp, wireprototypes.pusherr): |
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309 # This is the httplib workaround documented in _handlehttperror(). |
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310 req.drain() |
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311 |
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312 rsp = '0\n%s\n' % rsp.res |
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313 req.respond(HTTP_OK, HGTYPE, body=rsp) |
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314 return [] |
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315 elif isinstance(rsp, wireprototypes.ooberror): |
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316 rsp = rsp.message |
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317 req.respond(HTTP_OK, HGERRTYPE, body=rsp) |
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318 return [] |
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319 raise error.ProgrammingError('hgweb.protocol internal failure', rsp) |
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320 |
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321 def _handlehttperror(e, req, cmd): |
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322 """Called when an ErrorResponse is raised during HTTP request processing.""" |
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323 |
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324 # Clients using Python's httplib are stateful: the HTTP client |
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325 # won't process an HTTP response until all request data is |
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326 # sent to the server. The intent of this code is to ensure |
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327 # we always read HTTP request data from the client, thus |
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328 # ensuring httplib transitions to a state that allows it to read |
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329 # the HTTP response. In other words, it helps prevent deadlocks |
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330 # on clients using httplib. |
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331 |
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332 if (req.env[r'REQUEST_METHOD'] == r'POST' and |
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333 # But not if Expect: 100-continue is being used. |
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334 (req.env.get('HTTP_EXPECT', |
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335 '').lower() != '100-continue') or |
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336 # Or the non-httplib HTTP library is being advertised by |
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337 # the client. |
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338 req.env.get('X-HgHttp2', '')): |
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339 req.drain() |
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340 else: |
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341 req.headers.append((r'Connection', r'Close')) |
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342 |
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343 # TODO This response body assumes the failed command was |
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344 # "unbundle." That assumption is not always valid. |
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345 req.respond(e, HGTYPE, body='0\n%s\n' % pycompat.bytestr(e)) |
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346 |
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347 return '' |
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348 |
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349 def _sshv1respondbytes(fout, value): |
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350 """Send a bytes response for protocol version 1.""" |
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351 fout.write('%d\n' % len(value)) |
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352 fout.write(value) |
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353 fout.flush() |
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354 |
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355 def _sshv1respondstream(fout, source): |
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356 write = fout.write |
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357 for chunk in source.gen: |
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358 write(chunk) |
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359 fout.flush() |
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360 |
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361 def _sshv1respondooberror(fout, ferr, rsp): |
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362 ferr.write(b'%s\n-\n' % rsp) |
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363 ferr.flush() |
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364 fout.write(b'\n') |
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365 fout.flush() |
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366 |
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367 class sshv1protocolhandler(baseprotocolhandler): |
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368 """Handler for requests services via version 1 of SSH protocol.""" |
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369 def __init__(self, ui, fin, fout): |
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370 self._ui = ui |
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371 self._fin = fin |
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372 self._fout = fout |
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373 |
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374 @property |
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375 def name(self): |
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376 return SSHV1 |
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377 |
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378 def getargs(self, args): |
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379 data = {} |
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380 keys = args.split() |
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381 for n in xrange(len(keys)): |
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382 argline = self._fin.readline()[:-1] |
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383 arg, l = argline.split() |
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384 if arg not in keys: |
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385 raise error.Abort(_("unexpected parameter %r") % arg) |
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386 if arg == '*': |
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387 star = {} |
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388 for k in xrange(int(l)): |
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389 argline = self._fin.readline()[:-1] |
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390 arg, l = argline.split() |
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391 val = self._fin.read(int(l)) |
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392 star[arg] = val |
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393 data['*'] = star |
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394 else: |
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395 val = self._fin.read(int(l)) |
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396 data[arg] = val |
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397 return [data[k] for k in keys] |
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398 |
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399 def forwardpayload(self, fpout): |
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400 # The file is in the form: |
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401 # |
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402 # <chunk size>\n<chunk> |
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403 # ... |
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404 # 0\n |
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405 _sshv1respondbytes(self._fout, b'') |
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406 count = int(self._fin.readline()) |
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407 while count: |
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408 fpout.write(self._fin.read(count)) |
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409 count = int(self._fin.readline()) |
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410 |
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411 @contextlib.contextmanager |
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412 def mayberedirectstdio(self): |
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413 yield None |
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414 |
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415 def client(self): |
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416 client = encoding.environ.get('SSH_CLIENT', '').split(' ', 1)[0] |
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417 return 'remote:ssh:' + client |
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418 |
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419 class sshv2protocolhandler(sshv1protocolhandler): |
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420 """Protocol handler for version 2 of the SSH protocol.""" |
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421 |
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422 def _runsshserver(ui, repo, fin, fout): |
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423 # This function operates like a state machine of sorts. The following |
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424 # states are defined: |
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425 # |
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426 # protov1-serving |
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427 # Server is in protocol version 1 serving mode. Commands arrive on |
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428 # new lines. These commands are processed in this state, one command |
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429 # after the other. |
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430 # |
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431 # protov2-serving |
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432 # Server is in protocol version 2 serving mode. |
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433 # |
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434 # upgrade-initial |
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435 # The server is going to process an upgrade request. |
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436 # |
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437 # upgrade-v2-filter-legacy-handshake |
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438 # The protocol is being upgraded to version 2. The server is expecting |
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439 # the legacy handshake from version 1. |
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440 # |
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441 # upgrade-v2-finish |
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442 # The upgrade to version 2 of the protocol is imminent. |
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443 # |
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444 # shutdown |
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445 # The server is shutting down, possibly in reaction to a client event. |
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446 # |
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447 # And here are their transitions: |
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448 # |
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449 # protov1-serving -> shutdown |
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450 # When server receives an empty request or encounters another |
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451 # error. |
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452 # |
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453 # protov1-serving -> upgrade-initial |
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454 # An upgrade request line was seen. |
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455 # |
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456 # upgrade-initial -> upgrade-v2-filter-legacy-handshake |
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457 # Upgrade to version 2 in progress. Server is expecting to |
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458 # process a legacy handshake. |
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459 # |
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460 # upgrade-v2-filter-legacy-handshake -> shutdown |
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461 # Client did not fulfill upgrade handshake requirements. |
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462 # |
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463 # upgrade-v2-filter-legacy-handshake -> upgrade-v2-finish |
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464 # Client fulfilled version 2 upgrade requirements. Finishing that |
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465 # upgrade. |
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466 # |
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467 # upgrade-v2-finish -> protov2-serving |
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468 # Protocol upgrade to version 2 complete. Server can now speak protocol |
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469 # version 2. |
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470 # |
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471 # protov2-serving -> protov1-serving |
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472 # Ths happens by default since protocol version 2 is the same as |
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473 # version 1 except for the handshake. |
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474 |
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475 state = 'protov1-serving' |
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476 proto = sshv1protocolhandler(ui, fin, fout) |
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477 protoswitched = False |
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478 |
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479 while True: |
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480 if state == 'protov1-serving': |
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481 # Commands are issued on new lines. |
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482 request = fin.readline()[:-1] |
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483 |
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484 # Empty lines signal to terminate the connection. |
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485 if not request: |
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486 state = 'shutdown' |
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487 continue |
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488 |
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489 # It looks like a protocol upgrade request. Transition state to |
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490 # handle it. |
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491 if request.startswith(b'upgrade '): |
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492 if protoswitched: |
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493 _sshv1respondooberror(fout, ui.ferr, |
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494 b'cannot upgrade protocols multiple ' |
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495 b'times') |
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496 state = 'shutdown' |
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497 continue |
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498 |
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499 state = 'upgrade-initial' |
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500 continue |
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501 |
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502 available = wireproto.commands.commandavailable(request, proto) |
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503 |
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504 # This command isn't available. Send an empty response and go |
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505 # back to waiting for a new command. |
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506 if not available: |
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507 _sshv1respondbytes(fout, b'') |
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508 continue |
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509 |
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510 rsp = wireproto.dispatch(repo, proto, request) |
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511 |
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512 if isinstance(rsp, bytes): |
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513 _sshv1respondbytes(fout, rsp) |
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514 elif isinstance(rsp, wireprototypes.bytesresponse): |
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515 _sshv1respondbytes(fout, rsp.data) |
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516 elif isinstance(rsp, wireprototypes.streamres): |
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517 _sshv1respondstream(fout, rsp) |
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518 elif isinstance(rsp, wireprototypes.streamreslegacy): |
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519 _sshv1respondstream(fout, rsp) |
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520 elif isinstance(rsp, wireprototypes.pushres): |
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521 _sshv1respondbytes(fout, b'') |
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522 _sshv1respondbytes(fout, b'%d' % rsp.res) |
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523 elif isinstance(rsp, wireprototypes.pusherr): |
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524 _sshv1respondbytes(fout, rsp.res) |
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525 elif isinstance(rsp, wireprototypes.ooberror): |
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526 _sshv1respondooberror(fout, ui.ferr, rsp.message) |
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527 else: |
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528 raise error.ProgrammingError('unhandled response type from ' |
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529 'wire protocol command: %s' % rsp) |
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530 |
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531 # For now, protocol version 2 serving just goes back to version 1. |
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532 elif state == 'protov2-serving': |
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533 state = 'protov1-serving' |
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534 continue |
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535 |
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536 elif state == 'upgrade-initial': |
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537 # We should never transition into this state if we've switched |
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538 # protocols. |
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539 assert not protoswitched |
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540 assert proto.name == SSHV1 |
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541 |
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542 # Expected: upgrade <token> <capabilities> |
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543 # If we get something else, the request is malformed. It could be |
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544 # from a future client that has altered the upgrade line content. |
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545 # We treat this as an unknown command. |
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546 try: |
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547 token, caps = request.split(b' ')[1:] |
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548 except ValueError: |
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549 _sshv1respondbytes(fout, b'') |
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550 state = 'protov1-serving' |
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551 continue |
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552 |
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553 # Send empty response if we don't support upgrading protocols. |
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554 if not ui.configbool('experimental', 'sshserver.support-v2'): |
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555 _sshv1respondbytes(fout, b'') |
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556 state = 'protov1-serving' |
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557 continue |
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558 |
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559 try: |
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560 caps = urlreq.parseqs(caps) |
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561 except ValueError: |
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562 _sshv1respondbytes(fout, b'') |
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563 state = 'protov1-serving' |
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564 continue |
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565 |
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566 # We don't see an upgrade request to protocol version 2. Ignore |
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567 # the upgrade request. |
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568 wantedprotos = caps.get(b'proto', [b''])[0] |
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569 if SSHV2 not in wantedprotos: |
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570 _sshv1respondbytes(fout, b'') |
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571 state = 'protov1-serving' |
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572 continue |
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573 |
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574 # It looks like we can honor this upgrade request to protocol 2. |
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575 # Filter the rest of the handshake protocol request lines. |
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576 state = 'upgrade-v2-filter-legacy-handshake' |
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577 continue |
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578 |
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579 elif state == 'upgrade-v2-filter-legacy-handshake': |
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580 # Client should have sent legacy handshake after an ``upgrade`` |
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581 # request. Expected lines: |
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582 # |
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583 # hello |
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584 # between |
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585 # pairs 81 |
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586 # 0000...-0000... |
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587 |
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588 ok = True |
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589 for line in (b'hello', b'between', b'pairs 81'): |
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590 request = fin.readline()[:-1] |
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591 |
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592 if request != line: |
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593 _sshv1respondooberror(fout, ui.ferr, |
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594 b'malformed handshake protocol: ' |
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595 b'missing %s' % line) |
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596 ok = False |
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597 state = 'shutdown' |
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598 break |
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599 |
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600 if not ok: |
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601 continue |
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602 |
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603 request = fin.read(81) |
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604 if request != b'%s-%s' % (b'0' * 40, b'0' * 40): |
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605 _sshv1respondooberror(fout, ui.ferr, |
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606 b'malformed handshake protocol: ' |
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607 b'missing between argument value') |
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608 state = 'shutdown' |
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609 continue |
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610 |
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611 state = 'upgrade-v2-finish' |
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612 continue |
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613 |
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614 elif state == 'upgrade-v2-finish': |
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615 # Send the upgrade response. |
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616 fout.write(b'upgraded %s %s\n' % (token, SSHV2)) |
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617 servercaps = wireproto.capabilities(repo, proto) |
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618 rsp = b'capabilities: %s' % servercaps.data |
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619 fout.write(b'%d\n%s\n' % (len(rsp), rsp)) |
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620 fout.flush() |
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621 |
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622 proto = sshv2protocolhandler(ui, fin, fout) |
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623 protoswitched = True |
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624 |
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625 state = 'protov2-serving' |
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626 continue |
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627 |
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628 elif state == 'shutdown': |
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629 break |
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630 |
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631 else: |
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632 raise error.ProgrammingError('unhandled ssh server state: %s' % |
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633 state) |
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634 |
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635 class sshserver(object): |
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636 def __init__(self, ui, repo): |
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637 self._ui = ui |
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638 self._repo = repo |
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639 self._fin = ui.fin |
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640 self._fout = ui.fout |
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641 |
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642 hook.redirect(True) |
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643 ui.fout = repo.ui.fout = ui.ferr |
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644 |
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645 # Prevent insertion/deletion of CRs |
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646 util.setbinary(self._fin) |
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647 util.setbinary(self._fout) |
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648 |
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649 def serve_forever(self): |
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650 _runsshserver(self._ui, self._repo, self._fin, self._fout) |
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651 sys.exit(0) |