Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 1 | #! /usr/bin/env python |
Barry Warsaw | 406d46e | 2001-08-13 21:18:01 +0000 | [diff] [blame] | 2 | """An RFC 2821 smtp proxy. |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 3 | |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 4 | Usage: %(program)s [options] [localhost:localport [remotehost:remoteport]] |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 5 | |
| 6 | Options: |
| 7 | |
| 8 | --nosetuid |
| 9 | -n |
| 10 | This program generally tries to setuid `nobody', unless this flag is |
| 11 | set. The setuid call will fail if this program is not run as root (in |
| 12 | which case, use this flag). |
| 13 | |
| 14 | --version |
| 15 | -V |
| 16 | Print the version number and exit. |
| 17 | |
| 18 | --class classname |
| 19 | -c classname |
| 20 | Use `classname' as the concrete SMTP proxy class. Uses `SMTPProxy' by |
| 21 | default. |
| 22 | |
| 23 | --debug |
| 24 | -d |
| 25 | Turn on debugging prints. |
| 26 | |
| 27 | --help |
| 28 | -h |
| 29 | Print this message and exit. |
| 30 | |
| 31 | Version: %(__version__)s |
| 32 | |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 33 | If localhost is not given then `localhost' is used, and if localport is not |
| 34 | given then 8025 is used. If remotehost is not given then `localhost' is used, |
| 35 | and if remoteport is not given, then 25 is used. |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 36 | """ |
| 37 | |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 38 | |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 39 | # Overview: |
| 40 | # |
| 41 | # This file implements the minimal SMTP protocol as defined in RFC 821. It |
| 42 | # has a hierarchy of classes which implement the backend functionality for the |
| 43 | # smtpd. A number of classes are provided: |
| 44 | # |
Guido van Rossum | b8b45ea | 2001-04-15 13:06:04 +0000 | [diff] [blame] | 45 | # SMTPServer - the base class for the backend. Raises NotImplementedError |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 46 | # if you try to use it. |
| 47 | # |
| 48 | # DebuggingServer - simply prints each message it receives on stdout. |
| 49 | # |
| 50 | # PureProxy - Proxies all messages to a real smtpd which does final |
| 51 | # delivery. One known problem with this class is that it doesn't handle |
| 52 | # SMTP errors from the backend server at all. This should be fixed |
| 53 | # (contributions are welcome!). |
| 54 | # |
| 55 | # MailmanProxy - An experimental hack to work with GNU Mailman |
| 56 | # <www.list.org>. Using this server as your real incoming smtpd, your |
| 57 | # mailhost will automatically recognize and accept mail destined to Mailman |
| 58 | # lists when those lists are created. Every message not destined for a list |
| 59 | # gets forwarded to a real backend smtpd, as with PureProxy. Again, errors |
| 60 | # are not handled correctly yet. |
| 61 | # |
| 62 | # Please note that this script requires Python 2.0 |
| 63 | # |
| 64 | # Author: Barry Warsaw <barry@digicool.com> |
| 65 | # |
| 66 | # TODO: |
| 67 | # |
| 68 | # - support mailbox delivery |
| 69 | # - alias files |
| 70 | # - ESMTP |
| 71 | # - handle error codes from the backend smtpd |
| 72 | |
| 73 | import sys |
| 74 | import os |
| 75 | import errno |
| 76 | import getopt |
| 77 | import time |
| 78 | import socket |
| 79 | import asyncore |
| 80 | import asynchat |
| 81 | |
Skip Montanaro | 0de6580 | 2001-02-15 22:15:14 +0000 | [diff] [blame] | 82 | __all__ = ["SMTPServer","DebuggingServer","PureProxy","MailmanProxy"] |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 83 | |
| 84 | program = sys.argv[0] |
| 85 | __version__ = 'Python SMTP proxy version 0.2' |
| 86 | |
| 87 | |
| 88 | class Devnull: |
| 89 | def write(self, msg): pass |
| 90 | def flush(self): pass |
| 91 | |
| 92 | |
| 93 | DEBUGSTREAM = Devnull() |
| 94 | NEWLINE = '\n' |
| 95 | EMPTYSTRING = '' |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 96 | COMMASPACE = ', ' |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 97 | |
| 98 | |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 99 | |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 100 | def usage(code, msg=''): |
| 101 | print >> sys.stderr, __doc__ % globals() |
| 102 | if msg: |
| 103 | print >> sys.stderr, msg |
| 104 | sys.exit(code) |
| 105 | |
| 106 | |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 107 | |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 108 | class SMTPChannel(asynchat.async_chat): |
| 109 | COMMAND = 0 |
| 110 | DATA = 1 |
| 111 | |
| 112 | def __init__(self, server, conn, addr): |
| 113 | asynchat.async_chat.__init__(self, conn) |
| 114 | self.__server = server |
| 115 | self.__conn = conn |
| 116 | self.__addr = addr |
| 117 | self.__line = [] |
| 118 | self.__state = self.COMMAND |
| 119 | self.__greeting = 0 |
| 120 | self.__mailfrom = None |
| 121 | self.__rcpttos = [] |
| 122 | self.__data = '' |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 123 | self.__fqdn = socket.getfqdn() |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 124 | self.__peer = conn.getpeername() |
| 125 | print >> DEBUGSTREAM, 'Peer:', repr(self.__peer) |
| 126 | self.push('220 %s %s' % (self.__fqdn, __version__)) |
| 127 | self.set_terminator('\r\n') |
| 128 | |
| 129 | # Overrides base class for convenience |
| 130 | def push(self, msg): |
| 131 | asynchat.async_chat.push(self, msg + '\r\n') |
| 132 | |
| 133 | # Implementation of base class abstract method |
| 134 | def collect_incoming_data(self, data): |
| 135 | self.__line.append(data) |
| 136 | |
| 137 | # Implementation of base class abstract method |
| 138 | def found_terminator(self): |
| 139 | line = EMPTYSTRING.join(self.__line) |
Barry Warsaw | 406d46e | 2001-08-13 21:18:01 +0000 | [diff] [blame] | 140 | print >> DEBUGSTREAM, 'Data:', repr(line) |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 141 | self.__line = [] |
| 142 | if self.__state == self.COMMAND: |
| 143 | if not line: |
| 144 | self.push('500 Error: bad syntax') |
| 145 | return |
| 146 | method = None |
| 147 | i = line.find(' ') |
| 148 | if i < 0: |
| 149 | command = line.upper() |
| 150 | arg = None |
| 151 | else: |
| 152 | command = line[:i].upper() |
| 153 | arg = line[i+1:].strip() |
| 154 | method = getattr(self, 'smtp_' + command, None) |
| 155 | if not method: |
| 156 | self.push('502 Error: command "%s" not implemented' % command) |
| 157 | return |
| 158 | method(arg) |
| 159 | return |
| 160 | else: |
Guido van Rossum | 4ba3d65 | 2001-03-02 06:42:34 +0000 | [diff] [blame] | 161 | if self.__state != self.DATA: |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 162 | self.push('451 Internal confusion') |
| 163 | return |
| 164 | # Remove extraneous carriage returns and de-transparency according |
| 165 | # to RFC 821, Section 4.5.2. |
| 166 | data = [] |
| 167 | for text in line.split('\r\n'): |
| 168 | if text and text[0] == '.': |
| 169 | data.append(text[1:]) |
| 170 | else: |
| 171 | data.append(text) |
| 172 | self.__data = NEWLINE.join(data) |
| 173 | status = self.__server.process_message(self.__peer, |
| 174 | self.__mailfrom, |
| 175 | self.__rcpttos, |
| 176 | self.__data) |
| 177 | self.__rcpttos = [] |
| 178 | self.__mailfrom = None |
| 179 | self.__state = self.COMMAND |
| 180 | self.set_terminator('\r\n') |
| 181 | if not status: |
| 182 | self.push('250 Ok') |
| 183 | else: |
| 184 | self.push(status) |
| 185 | |
| 186 | # SMTP and ESMTP commands |
| 187 | def smtp_HELO(self, arg): |
| 188 | if not arg: |
| 189 | self.push('501 Syntax: HELO hostname') |
| 190 | return |
| 191 | if self.__greeting: |
| 192 | self.push('503 Duplicate HELO/EHLO') |
| 193 | else: |
| 194 | self.__greeting = arg |
| 195 | self.push('250 %s' % self.__fqdn) |
| 196 | |
| 197 | def smtp_NOOP(self, arg): |
| 198 | if arg: |
| 199 | self.push('501 Syntax: NOOP') |
| 200 | else: |
| 201 | self.push('250 Ok') |
| 202 | |
| 203 | def smtp_QUIT(self, arg): |
| 204 | # args is ignored |
| 205 | self.push('221 Bye') |
| 206 | self.close_when_done() |
| 207 | |
| 208 | # factored |
| 209 | def __getaddr(self, keyword, arg): |
| 210 | address = None |
| 211 | keylen = len(keyword) |
| 212 | if arg[:keylen].upper() == keyword: |
| 213 | address = arg[keylen:].strip() |
Barry Warsaw | ebf5427 | 2001-11-04 03:04:25 +0000 | [diff] [blame] | 214 | if not address: |
| 215 | pass |
| 216 | elif address[0] == '<' and address[-1] == '>' and address != '<>': |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 217 | # Addresses can be in the form <person@dom.com> but watch out |
| 218 | # for null address, e.g. <> |
| 219 | address = address[1:-1] |
| 220 | return address |
| 221 | |
| 222 | def smtp_MAIL(self, arg): |
| 223 | print >> DEBUGSTREAM, '===> MAIL', arg |
| 224 | address = self.__getaddr('FROM:', arg) |
| 225 | if not address: |
| 226 | self.push('501 Syntax: MAIL FROM:<address>') |
| 227 | return |
| 228 | if self.__mailfrom: |
| 229 | self.push('503 Error: nested MAIL command') |
| 230 | return |
| 231 | self.__mailfrom = address |
| 232 | print >> DEBUGSTREAM, 'sender:', self.__mailfrom |
| 233 | self.push('250 Ok') |
| 234 | |
| 235 | def smtp_RCPT(self, arg): |
| 236 | print >> DEBUGSTREAM, '===> RCPT', arg |
| 237 | if not self.__mailfrom: |
| 238 | self.push('503 Error: need MAIL command') |
| 239 | return |
| 240 | address = self.__getaddr('TO:', arg) |
| 241 | if not address: |
| 242 | self.push('501 Syntax: RCPT TO: <address>') |
| 243 | return |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 244 | self.__rcpttos.append(address) |
| 245 | print >> DEBUGSTREAM, 'recips:', self.__rcpttos |
| 246 | self.push('250 Ok') |
| 247 | |
| 248 | def smtp_RSET(self, arg): |
| 249 | if arg: |
| 250 | self.push('501 Syntax: RSET') |
| 251 | return |
| 252 | # Resets the sender, recipients, and data, but not the greeting |
| 253 | self.__mailfrom = None |
| 254 | self.__rcpttos = [] |
| 255 | self.__data = '' |
| 256 | self.__state = self.COMMAND |
| 257 | self.push('250 Ok') |
| 258 | |
| 259 | def smtp_DATA(self, arg): |
| 260 | if not self.__rcpttos: |
| 261 | self.push('503 Error: need RCPT command') |
| 262 | return |
| 263 | if arg: |
| 264 | self.push('501 Syntax: DATA') |
| 265 | return |
| 266 | self.__state = self.DATA |
| 267 | self.set_terminator('\r\n.\r\n') |
| 268 | self.push('354 End data with <CR><LF>.<CR><LF>') |
| 269 | |
| 270 | |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 271 | |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 272 | class SMTPServer(asyncore.dispatcher): |
| 273 | def __init__(self, localaddr, remoteaddr): |
| 274 | self._localaddr = localaddr |
| 275 | self._remoteaddr = remoteaddr |
| 276 | asyncore.dispatcher.__init__(self) |
| 277 | self.create_socket(socket.AF_INET, socket.SOCK_STREAM) |
| 278 | # try to re-use a server port if possible |
Barry Warsaw | 93a6327 | 2001-10-09 15:46:31 +0000 | [diff] [blame] | 279 | self.set_reuse_addr() |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 280 | self.bind(localaddr) |
| 281 | self.listen(5) |
Barry Warsaw | 4a8e9f4 | 2001-10-05 17:10:31 +0000 | [diff] [blame] | 282 | print >> DEBUGSTREAM, \ |
| 283 | '%s started at %s\n\tLocal addr: %s\n\tRemote addr:%s' % ( |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 284 | self.__class__.__name__, time.ctime(time.time()), |
| 285 | localaddr, remoteaddr) |
| 286 | |
| 287 | def handle_accept(self): |
| 288 | conn, addr = self.accept() |
| 289 | print >> DEBUGSTREAM, 'Incoming connection from %s' % repr(addr) |
| 290 | channel = SMTPChannel(self, conn, addr) |
| 291 | |
| 292 | # API for "doing something useful with the message" |
| 293 | def process_message(self, peer, mailfrom, rcpttos, data): |
| 294 | """Override this abstract method to handle messages from the client. |
| 295 | |
| 296 | peer is a tuple containing (ipaddr, port) of the client that made the |
| 297 | socket connection to our smtp port. |
| 298 | |
| 299 | mailfrom is the raw address the client claims the message is coming |
| 300 | from. |
| 301 | |
| 302 | rcpttos is a list of raw addresses the client wishes to deliver the |
| 303 | message to. |
| 304 | |
| 305 | data is a string containing the entire full text of the message, |
| 306 | headers (if supplied) and all. It has been `de-transparencied' |
| 307 | according to RFC 821, Section 4.5.2. In other words, a line |
| 308 | containing a `.' followed by other text has had the leading dot |
| 309 | removed. |
| 310 | |
| 311 | This function should return None, for a normal `250 Ok' response; |
| 312 | otherwise it returns the desired response string in RFC 821 format. |
| 313 | |
| 314 | """ |
Guido van Rossum | b8b45ea | 2001-04-15 13:06:04 +0000 | [diff] [blame] | 315 | raise NotImplementedError |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 316 | |
Tim Peters | 658cba6 | 2001-02-09 20:06:00 +0000 | [diff] [blame] | 317 | |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 318 | |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 319 | class DebuggingServer(SMTPServer): |
| 320 | # Do something with the gathered message |
| 321 | def process_message(self, peer, mailfrom, rcpttos, data): |
| 322 | inheaders = 1 |
| 323 | lines = data.split('\n') |
| 324 | print '---------- MESSAGE FOLLOWS ----------' |
| 325 | for line in lines: |
| 326 | # headers first |
| 327 | if inheaders and not line: |
| 328 | print 'X-Peer:', peer[0] |
| 329 | inheaders = 0 |
| 330 | print line |
| 331 | print '------------ END MESSAGE ------------' |
| 332 | |
| 333 | |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 334 | |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 335 | class PureProxy(SMTPServer): |
| 336 | def process_message(self, peer, mailfrom, rcpttos, data): |
| 337 | lines = data.split('\n') |
| 338 | # Look for the last header |
| 339 | i = 0 |
| 340 | for line in lines: |
| 341 | if not line: |
| 342 | break |
| 343 | i += 1 |
| 344 | lines.insert(i, 'X-Peer: %s' % peer[0]) |
| 345 | data = NEWLINE.join(lines) |
| 346 | refused = self._deliver(mailfrom, rcpttos, data) |
| 347 | # TBD: what to do with refused addresses? |
Neal Norwitz | f151625 | 2002-02-11 18:05:05 +0000 | [diff] [blame] | 348 | print >> DEBUGSTREAM, 'we got some refusals:', refused |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 349 | |
| 350 | def _deliver(self, mailfrom, rcpttos, data): |
| 351 | import smtplib |
| 352 | refused = {} |
| 353 | try: |
| 354 | s = smtplib.SMTP() |
| 355 | s.connect(self._remoteaddr[0], self._remoteaddr[1]) |
| 356 | try: |
| 357 | refused = s.sendmail(mailfrom, rcpttos, data) |
| 358 | finally: |
| 359 | s.quit() |
| 360 | except smtplib.SMTPRecipientsRefused, e: |
| 361 | print >> DEBUGSTREAM, 'got SMTPRecipientsRefused' |
| 362 | refused = e.recipients |
| 363 | except (socket.error, smtplib.SMTPException), e: |
| 364 | print >> DEBUGSTREAM, 'got', e.__class__ |
| 365 | # All recipients were refused. If the exception had an associated |
| 366 | # error code, use it. Otherwise,fake it with a non-triggering |
| 367 | # exception code. |
| 368 | errcode = getattr(e, 'smtp_code', -1) |
| 369 | errmsg = getattr(e, 'smtp_error', 'ignore') |
| 370 | for r in rcpttos: |
| 371 | refused[r] = (errcode, errmsg) |
| 372 | return refused |
| 373 | |
| 374 | |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 375 | |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 376 | class MailmanProxy(PureProxy): |
| 377 | def process_message(self, peer, mailfrom, rcpttos, data): |
| 378 | from cStringIO import StringIO |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 379 | from Mailman import Utils |
| 380 | from Mailman import Message |
| 381 | from Mailman import MailList |
| 382 | # If the message is to a Mailman mailing list, then we'll invoke the |
| 383 | # Mailman script directly, without going through the real smtpd. |
| 384 | # Otherwise we'll forward it to the local proxy for disposition. |
| 385 | listnames = [] |
| 386 | for rcpt in rcpttos: |
| 387 | local = rcpt.lower().split('@')[0] |
| 388 | # We allow the following variations on the theme |
| 389 | # listname |
| 390 | # listname-admin |
| 391 | # listname-owner |
| 392 | # listname-request |
| 393 | # listname-join |
| 394 | # listname-leave |
| 395 | parts = local.split('-') |
| 396 | if len(parts) > 2: |
| 397 | continue |
| 398 | listname = parts[0] |
| 399 | if len(parts) == 2: |
| 400 | command = parts[1] |
| 401 | else: |
| 402 | command = '' |
| 403 | if not Utils.list_exists(listname) or command not in ( |
| 404 | '', 'admin', 'owner', 'request', 'join', 'leave'): |
| 405 | continue |
| 406 | listnames.append((rcpt, listname, command)) |
| 407 | # Remove all list recipients from rcpttos and forward what we're not |
| 408 | # going to take care of ourselves. Linear removal should be fine |
| 409 | # since we don't expect a large number of recipients. |
| 410 | for rcpt, listname, command in listnames: |
| 411 | rcpttos.remove(rcpt) |
Tim Peters | 658cba6 | 2001-02-09 20:06:00 +0000 | [diff] [blame] | 412 | # If there's any non-list destined recipients left, |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 413 | print >> DEBUGSTREAM, 'forwarding recips:', ' '.join(rcpttos) |
| 414 | if rcpttos: |
| 415 | refused = self._deliver(mailfrom, rcpttos, data) |
| 416 | # TBD: what to do with refused addresses? |
Neal Norwitz | f151625 | 2002-02-11 18:05:05 +0000 | [diff] [blame] | 417 | print >> DEBUGSTREAM, 'we got refusals:', refused |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 418 | # Now deliver directly to the list commands |
| 419 | mlists = {} |
| 420 | s = StringIO(data) |
| 421 | msg = Message.Message(s) |
| 422 | # These headers are required for the proper execution of Mailman. All |
| 423 | # MTAs in existance seem to add these if the original message doesn't |
| 424 | # have them. |
| 425 | if not msg.getheader('from'): |
| 426 | msg['From'] = mailfrom |
| 427 | if not msg.getheader('date'): |
| 428 | msg['Date'] = time.ctime(time.time()) |
| 429 | for rcpt, listname, command in listnames: |
| 430 | print >> DEBUGSTREAM, 'sending message to', rcpt |
| 431 | mlist = mlists.get(listname) |
| 432 | if not mlist: |
| 433 | mlist = MailList.MailList(listname, lock=0) |
| 434 | mlists[listname] = mlist |
| 435 | # dispatch on the type of command |
| 436 | if command == '': |
| 437 | # post |
| 438 | msg.Enqueue(mlist, tolist=1) |
| 439 | elif command == 'admin': |
| 440 | msg.Enqueue(mlist, toadmin=1) |
| 441 | elif command == 'owner': |
| 442 | msg.Enqueue(mlist, toowner=1) |
| 443 | elif command == 'request': |
| 444 | msg.Enqueue(mlist, torequest=1) |
| 445 | elif command in ('join', 'leave'): |
| 446 | # TBD: this is a hack! |
| 447 | if command == 'join': |
| 448 | msg['Subject'] = 'subscribe' |
| 449 | else: |
| 450 | msg['Subject'] = 'unsubscribe' |
| 451 | msg.Enqueue(mlist, torequest=1) |
| 452 | |
| 453 | |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 454 | |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 455 | class Options: |
| 456 | setuid = 1 |
| 457 | classname = 'PureProxy' |
| 458 | |
| 459 | |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 460 | |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 461 | def parseargs(): |
| 462 | global DEBUGSTREAM |
| 463 | try: |
| 464 | opts, args = getopt.getopt( |
| 465 | sys.argv[1:], 'nVhc:d', |
| 466 | ['class=', 'nosetuid', 'version', 'help', 'debug']) |
| 467 | except getopt.error, e: |
| 468 | usage(1, e) |
| 469 | |
| 470 | options = Options() |
| 471 | for opt, arg in opts: |
| 472 | if opt in ('-h', '--help'): |
| 473 | usage(0) |
| 474 | elif opt in ('-V', '--version'): |
| 475 | print >> sys.stderr, __version__ |
| 476 | sys.exit(0) |
| 477 | elif opt in ('-n', '--nosetuid'): |
| 478 | options.setuid = 0 |
| 479 | elif opt in ('-c', '--class'): |
| 480 | options.classname = arg |
| 481 | elif opt in ('-d', '--debug'): |
| 482 | DEBUGSTREAM = sys.stderr |
| 483 | |
| 484 | # parse the rest of the arguments |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 485 | if len(args) < 1: |
| 486 | localspec = 'localhost:8025' |
| 487 | remotespec = 'localhost:25' |
| 488 | elif len(args) < 2: |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 489 | localspec = args[0] |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 490 | remotespec = 'localhost:25' |
Barry Warsaw | ebf5427 | 2001-11-04 03:04:25 +0000 | [diff] [blame] | 491 | elif len(args) < 3: |
| 492 | localspec = args[0] |
| 493 | remotespec = args[1] |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 494 | else: |
| 495 | usage(1, 'Invalid arguments: %s' % COMMASPACE.join(args)) |
| 496 | |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 497 | # split into host/port pairs |
| 498 | i = localspec.find(':') |
| 499 | if i < 0: |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 500 | usage(1, 'Bad local spec: %s' % localspec) |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 501 | options.localhost = localspec[:i] |
| 502 | try: |
| 503 | options.localport = int(localspec[i+1:]) |
| 504 | except ValueError: |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 505 | usage(1, 'Bad local port: %s' % localspec) |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 506 | i = remotespec.find(':') |
| 507 | if i < 0: |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 508 | usage(1, 'Bad remote spec: %s' % remotespec) |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 509 | options.remotehost = remotespec[:i] |
| 510 | try: |
| 511 | options.remoteport = int(remotespec[i+1:]) |
| 512 | except ValueError: |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 513 | usage(1, 'Bad remote port: %s' % remotespec) |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 514 | return options |
| 515 | |
| 516 | |
Barry Warsaw | 0e8427e | 2001-10-04 16:27:04 +0000 | [diff] [blame] | 517 | |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 518 | if __name__ == '__main__': |
| 519 | options = parseargs() |
| 520 | # Become nobody |
| 521 | if options.setuid: |
| 522 | try: |
| 523 | import pwd |
| 524 | except ImportError: |
| 525 | print >> sys.stderr, \ |
| 526 | 'Cannot import module "pwd"; try running with -n option.' |
| 527 | sys.exit(1) |
| 528 | nobody = pwd.getpwnam('nobody')[2] |
| 529 | try: |
| 530 | os.setuid(nobody) |
| 531 | except OSError, e: |
Guido van Rossum | 4ba3d65 | 2001-03-02 06:42:34 +0000 | [diff] [blame] | 532 | if e.errno != errno.EPERM: raise |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 533 | print >> sys.stderr, \ |
| 534 | 'Cannot setuid "nobody"; try running with -n option.' |
| 535 | sys.exit(1) |
Skip Montanaro | 90e0153 | 2004-06-26 19:18:49 +0000 | [diff] [blame] | 536 | classname = options.classname |
| 537 | if "." in classname: |
| 538 | lastdot = classname.rfind(".") |
| 539 | mod = __import__(classname[:lastdot], globals(), locals(), [""]) |
| 540 | classname = classname[lastdot+1:] |
| 541 | else: |
| 542 | import __main__ as mod |
Skip Montanaro | 90e0153 | 2004-06-26 19:18:49 +0000 | [diff] [blame] | 543 | class_ = getattr(mod, classname) |
Barry Warsaw | 7e0d956 | 2001-01-31 22:51:35 +0000 | [diff] [blame] | 544 | proxy = class_((options.localhost, options.localport), |
| 545 | (options.remotehost, options.remoteport)) |
| 546 | try: |
| 547 | asyncore.loop() |
| 548 | except KeyboardInterrupt: |
| 549 | pass |