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1 | .\" -*-nroff-*- |
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2 | .\" |
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3 | .\" $Id$ |
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4 | .\" |
5 | .\" Manual page for fw |
6 | .\" |
7 | .\" (c) 1999 Straylight/Edgeware |
8 | .\" |
9 | . |
10 | .\"----- Licensing notice --------------------------------------------------- |
11 | .\" |
12 | .\" This file is part of the `fw' port forwarder. |
13 | .\" |
14 | .\" `fw' is free software; you can redistribute it and/or modify |
15 | .\" it under the terms of the GNU General Public License as published by |
16 | .\" the Free Software Foundation; either version 2 of the License, or |
17 | .\" (at your option) any later version. |
18 | .\" |
19 | .\" `fw' is distributed in the hope that it will be useful, |
20 | .\" but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | .\" GNU General Public License for more details. |
23 | .\" |
24 | .\" You should have received a copy of the GNU General Public License |
25 | .\" along with `fw'; if not, write to the Free Software Foundation, |
26 | .\" Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | . |
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28 | .\"----- Various bits of fancy styling -------------------------------------- |
29 | . |
30 | .\" --- Indented paragraphs with right-aligned tags --- |
31 | . |
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32 | .de hP |
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34 | \h'-\w'\fB\\$1\ \fP'u'\fB\\$1\ \fP\c |
35 | .. |
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36 | . |
37 | .\" --- Verbatim-oid typesetting --- |
38 | .de VS |
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43 | .. |
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49 | .. |
50 | . |
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51 | .\" --- Grammar markup --- |
52 | .\" |
53 | .\" This is mainly for the benefit of the automatic scripts which |
54 | .\" generate the grammar summary. |
55 | . |
56 | .de GS |
57 | .PP |
58 | .. |
59 | .de GE |
60 | .PP |
61 | .. |
62 | . |
63 | .de OS |
64 | .PP |
65 | .. |
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73 | .\" --- Other bits of styling --- |
74 | . |
75 | .ie t \{\ |
76 | . ds o \(bu |
77 | . ds ss \s8\u |
78 | . ds se \d\s0 |
79 | . if \n(.g \{\ |
80 | . fam P |
81 | . \} |
82 | .\} |
83 | .el \{\ |
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86 | . ds se |
87 | .\} |
88 | . |
89 | .\"-------------------------------------------------------------------------- |
90 | . |
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91 | .TH fw 1 "1 July 1999" "Straylight/Edgeware" "fw port forwarder" |
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92 | . |
93 | .\"-------------------------------------------------------------------------- |
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94 | .SH NAME |
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95 | . |
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96 | fw \- port forwarder |
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97 | . |
98 | .\"-------------------------------------------------------------------------- |
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99 | .SH SYNOPSIS |
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100 | . |
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101 | .B fw |
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102 | .RB [ \-dlpq ] |
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103 | .RB [ \-f |
104 | .IR file ] |
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105 | .RB [ \-s |
106 | .IR user ] |
107 | .RB [ \-g |
108 | .IR group ] |
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109 | .IR config-stmt ... |
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110 | . |
111 | .\"-------------------------------------------------------------------------- |
112 | .SH "DESCRIPTION" |
113 | . |
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114 | The |
115 | .B fw |
116 | program is a simple port forwarder. It supports a number of features |
117 | the author hasn't found in similar programs: |
118 | .TP |
119 | .I "Connection logging" |
120 | Each connection attempt to the forwarder is logged, giving the time of |
121 | the connection, the DNS-resolved hostname (if available), and the user |
122 | name resulting from an RFC931 lookup. These lookups are done |
123 | asynchronously to the main forwarder's operation. |
124 | .TP |
125 | .I "Access control" |
126 | Each forwarded port may have an access control list attached to it. |
127 | Only authorized hosts are allowed to connect. Access control checks are |
128 | performed by quick checks on the client's IP address. |
129 | .TP |
130 | .I "Nonblocking single-process design" |
131 | The internal structure of the server is completely nonblocking. The |
132 | connections don't block; the reading and writing don't block; the name |
133 | lookups don't block. This is all done in a single process, with the |
134 | single exception of the DNS resolver. |
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135 | .TP |
136 | .I "Support for Unix-domain sockets" |
137 | Connections from and to Unix-domain sockets can be handled just as |
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138 | easily as more normal Internet sockets. Access control doesn't work on |
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139 | Unix domain sockets, though. (Yet.) |
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140 | .SS "Command line options" |
141 | The |
142 | .B fw |
143 | program understands a few simple command line options: |
144 | .TP |
145 | .B "\-h, \-\-help" |
146 | Displays a screen of help text on standard output and exits |
147 | successfully. |
148 | .TP |
149 | .B "\-v, \-\-version" |
150 | Writes the version number to standard output and exits successfully. |
151 | .TP |
152 | .B "\-u, \-\-usage" |
153 | Writes a terse usage summary to standard output and exits successfully. |
154 | .TP |
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155 | .B "\-G, \-\-grammar" |
156 | Writes a summary of the configuration file grammar to standard output |
157 | and exits successfully. |
158 | .TP |
159 | .B "\-O, \-\-options" |
160 | Writes a summary of the source and target options to standard output and |
161 | exits successfully. |
162 | .TP |
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163 | .BI "\-f, \-\-file=" file |
164 | Read configuration information from |
165 | .IR file . |
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166 | Equivalent to an |
167 | .RB ` include |
168 | .IR file ' |
169 | configuration file statement. |
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170 | .TP |
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171 | .B "\-d, \-\-daemon, \-\-fork" |
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172 | Forks into the background after reading the configuration and |
173 | initializing properly. |
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174 | .TP |
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175 | .B "\-l, \-\-syslog, \-\-log" |
176 | Emit logging information to the system log, rather than standard error. |
177 | .TP |
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178 | .B "\-p, \-\-pidfile=" file |
179 | Write |
180 | .BR fw 's |
181 | process-id to |
182 | .I file |
183 | during start-up. If |
184 | .B \-d |
185 | is given too, then the process-id is written after forking (obviously). |
186 | .TP |
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187 | .B "\-q, \-\-quiet" |
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188 | Don't output any logging information. This option is not recommended |
189 | for normal use, although it can make system call traces clearer so I use |
190 | it when debugging. |
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191 | .TP |
192 | .BI "\-s, \-\-setuid=" user |
193 | Change uid to that of |
194 | .IR user , |
195 | which may be either a user name or uid number, after initializing all |
196 | the sources. This will usually require elevated privileges. |
197 | .TP |
198 | .BI "\-g, \-\-setgid=" group |
199 | Change gid to that of |
200 | .IR group , |
201 | which may be either a group name or gid number, after initializing all |
202 | the sources. If the operating system understands supplementary groups |
203 | then the supplementary groups list is altered to include only |
204 | .IR group . |
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205 | .PP |
206 | Any further command line arguments are interpreted as configuration |
207 | lines to be read. Configuration supplied in command line arguments has |
208 | precisely the same syntax as configuration in files. If there are no |
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209 | configuration statements on the command line, and no |
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210 | .B \-f |
211 | options were supplied, configuration is read from standard input, if |
212 | stdin is not a terminal. |
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213 | . |
214 | .\"-------------------------------------------------------------------------- |
215 | .SH "CONFIGURATION LANGUAGE" |
216 | . |
217 | The |
218 | .B fw |
219 | program has a fairly sophisticated configuration language to let you |
220 | describe which things should be forwarded where and what special |
221 | features there should be. |
222 | .SS "Lexical structure" |
223 | There are four types of characters. |
224 | .TP |
225 | .I "word constituent characters" |
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226 | Word constituent characters are gathered together into words. |
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227 | Depending on its surrounding context, a word might act as a keyword or a |
228 | string. All alphanumerics are word constituents, as is the hyphen |
229 | .RB ` \- '. |
230 | Other characters may change their status in future versions. |
231 | .TP |
232 | .I "self-delimiting characters" |
233 | Self-delimiting characters always stand alone. They act as punctuation, |
234 | shaping the sequence of words into more complex grammatical forms. The |
235 | characters |
236 | .RB ` { ', |
237 | .RB ` } ', |
238 | .RB ` [ ', |
239 | .RB ` ] ', |
240 | .RB ` / ', |
241 | .RB ` , ', |
242 | .RB ` = ', |
243 | .RB ` : ', |
244 | .RB ` ; ' |
245 | and |
246 | .RB ` . ' |
247 | are self-delimiting. Note that while some characters, e.g., |
248 | .RB ` [ ' |
249 | and |
250 | .RB ` ; ', |
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251 | require escaping by the shell, they are mostly optional in the grammar |
252 | and can tend to be omitted in quick hacks at the shell prompt. |
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253 | .TP |
254 | .I "whitespace characters" |
255 | Whitespace characters separate words but are otherwise ignored. All |
256 | `normal' whitespace characters (e.g., space, tab and newline) are |
257 | considered to be whitespace for these purposes. |
258 | .TP |
259 | .I "special characters" |
260 | There are three special characters. The |
261 | .RB ` # ' |
262 | character, if it appears at the start of a word, introduces a |
263 | .I comment |
264 | which extends to the end of the current line or command-line argument. |
265 | Within a word, it behaves like a normal word-constituent character. The |
266 | backslash |
267 | .RB ` \e ' |
268 | escapes the following character causing it to be interpreted as a word |
269 | constituent regardless of its normal type. The double-quote |
270 | .RB ` """" ' |
271 | escapes all characters other than backslashes up to the next |
272 | double-quote and causes them to be regarded as word constituents. Note |
273 | that you don't have to quote a whole word. The backslash can escape a |
274 | quote character allowing you to insert it into a word if really |
275 | necessary. |
276 | . |
277 | .SS "Basic syntax" |
278 | The overall syntax looks a bit like this: |
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279 | .GS "Basic syntax" |
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280 | .I file |
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281 | ::= |
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282 | .I empty |
283 | | |
284 | .I file |
285 | .I stmt |
286 | .RB [ ; ] |
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287 | .br |
288 | .I stmt |
289 | ::= |
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290 | .I option-stmt |
291 | | |
292 | .I fw-stmt |
293 | .br |
294 | .I fw-stmt |
295 | ::= |
296 | .B fw |
297 | .I source |
298 | .I options |
299 | .RB [ to | \-> ] |
300 | .I target |
301 | .I options |
302 | .br |
303 | .I options |
304 | ::= |
305 | .B { |
306 | .I option-seq |
307 | .B } |
308 | .br |
309 | .I option-seq |
310 | ::= |
311 | .I empty |
312 | | |
313 | .I option-stmt |
314 | .RB [ ; ] |
315 | .I option-seq |
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316 | .GE |
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317 | If you prefer, the keyword |
318 | .RB ` fw ' |
319 | may be spelt |
320 | .RB ` forward ' |
321 | or |
322 | .RB ` from '. |
323 | All are equivalent. |
324 | . |
325 | .SS "Sources and targets" |
326 | Forwarding is set up by attaching |
327 | .I targets |
328 | to |
329 | .IR sources . |
330 | Sources are things which are capable of |
331 | .I initiating |
332 | one end of a data flow on their own, while targets are things which are |
333 | capable of setting up the other end on demand. In the case of a TCP |
334 | port forwarder, the part which listens for incoming client connections |
335 | is the source, while the part which sets up outgoing connections to the |
336 | destination server is the target. |
337 | .PP |
338 | Essentially, all |
339 | .B fw |
340 | does is set up a collection of sources and targets based on your |
341 | configuration file so that when a source decides to initiate a data |
342 | flow, it tells its target to set its end up, and then squirts data back |
343 | and forth between the two until there's no more. |
344 | .PP |
345 | Some sources are |
346 | .IR persistent : |
347 | they stay around indefinitely setting up multiple attachments to |
348 | targets. Others are |
349 | .IR transient : |
350 | they set up one connection and then disappear. If all the sources |
351 | defined are transient, then |
352 | .B fw |
353 | will quit when no more active sources remain and all connections have |
354 | terminated. |
355 | .PP |
356 | The |
357 | .B fw |
358 | program is fairly versatile. It allows you to attach any supported type |
359 | of source to any supported type of target. This will, I hope, be the |
360 | case in all future versions. |
361 | .PP |
362 | The syntax of a |
363 | .I source |
364 | or |
365 | .I target |
366 | depend on the source or target type, and are therefore described in the |
367 | sections specific to the various types. |
368 | . |
369 | .SS "Options structure" |
370 | Most of the objects that |
371 | .B fw |
372 | knows about (including sources and targets, but also other more specific |
373 | things such as socket address types) can have their behaviour modified |
374 | by |
375 | .IR options . |
376 | The options available at a particular point in the configuration depend |
377 | on the |
378 | .IR context . |
379 | A global option, outside of a |
380 | .I fw-stmt |
381 | has no context unless it is explicitly qualified, and affects global |
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382 | behaviour. A local option, applied to a source or target in a |
383 | .IR fw-stmt , |
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384 | has the context of the type of source or target to which it is applied, |
385 | and affects only that source or target. |
386 | .PP |
387 | Note that it's important to distinguish between an option's context |
388 | (which is affected by its qualification) and its local or global |
389 | status. No matter how qualified, a global option will always control |
390 | default options for objects, and a local option will only affect a |
391 | specific source or target. |
392 | .PP |
393 | The syntax for qualifying options is like this: |
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394 | .GS "Option syntax" |
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395 | .I option-stmt |
396 | ::= |
397 | .I q-option |
398 | .br |
399 | .I q-option |
400 | ::= |
401 | .I option |
402 | .br |
403 | | |
404 | .I prefix |
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405 | .B .\& |
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406 | .I q-option |
407 | .br |
408 | | |
409 | .I prefix |
410 | .B { |
411 | .I option-seq |
412 | .B } |
413 | .br |
414 | .I prefix |
415 | ::= |
416 | .I word |
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417 | .GE |
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418 | Thus, you may qualify either an individual option or a sequence of |
419 | options. The two are equivalent; for example, |
420 | .VS |
421 | exec.rlimit { |
422 | core = 0; |
423 | cpu = 60; |
424 | } |
425 | .VE |
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426 | means the same as |
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427 | .VS |
428 | exec.rlimit.core = 0; |
429 | exec.rlimit.cpu = 0; |
430 | .VE |
431 | For each option, there is a sequence of prefixes which maximally qualify |
432 | that option. An option prefixed with this sequence is |
433 | .IR "fully qualified" . |
434 | In actual use, some or all of those prefixes may be omitted. However, |
435 | it's possible for the option to become |
436 | .I ambiguous |
437 | if you do this. For example, the option |
438 | .B fattr.owner |
439 | may refer either to |
440 | .B file.fattr.owner |
441 | or to |
442 | .BR socket.unix.fattr.owner . |
443 | In this case, the ambiguity is benign: a local option will have as its |
444 | context an appropriate source or target, and both global options |
445 | actually control the same default. However, the option |
446 | .B logging |
447 | may mean either |
448 | .B socket.logging |
449 | or |
450 | .BR exec.logging , |
451 | which have separate defaults, and which one you actually get depends on |
452 | the exact implementation of |
453 | .BR fw 's |
454 | option parser. (Currently this would resolve to |
455 | .BR exec.logging , |
456 | although this may change in a later version.) |
457 | .PP |
458 | In this manual, options are usually shown in their fully-qualified form. |
459 | . |
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460 | .SS "File attributes for created files: `fattr'" |
461 | Both the |
462 | .B file |
463 | and |
464 | .B socket |
465 | sources and targets can create new filesystem objects. The |
466 | .B fattr |
467 | options allow control over the attributes of the newly-created objects. |
468 | Both |
469 | .B file |
470 | and |
471 | .B socket |
472 | use the same set of defaults, so a prefix of |
473 | .B fattr |
474 | is good enough for setting global options, and the implicit context |
475 | disambiguates local options. |
476 | .PP |
477 | The following file attribute options are supported: |
478 | .OS "File attribute options (`fattr')" |
479 | .IB prefix .fattr.mode |
480 | .RB [ = ] |
481 | .I mode |
482 | .OD |
483 | Sets the permissions mode for a new file. The |
484 | .I mode |
485 | argument may be either an octal number or a |
486 | .BR chmod (1)-style |
487 | string which acts on the default permissions established by the |
488 | prevailing |
489 | .BR umask (2) |
490 | setting. The characters |
491 | .RB ` = ' |
492 | and |
493 | .RB ` , ' |
494 | do not have to be quoted within the mode string. |
495 | .OE |
496 | .OS "File attribute options (`fattr')" |
497 | .IB prefix .fattr.owner |
498 | .RB [ = ] |
499 | .I user |
500 | .OD |
501 | Sets the owner for newly created files. On non-broken systems you will |
502 | need to be the superuser to set the owner on a file. The |
503 | .I user |
504 | may either be a numeric uid or a username. The default is not to change |
505 | the owner of the file once it's created. The synonyms |
506 | .B uid |
507 | and |
508 | .B user |
509 | are accepted in place of |
510 | .BR owner . |
511 | .OE |
512 | .OS "File attribute options (`fattr')" |
513 | .IB prefix .fattr.group |
514 | .RB [ = ] |
515 | .I group |
516 | .OD |
517 | Sets the group for newly created files. You will usually need to be a |
518 | member of the group in question order to set the group of a file. The |
519 | .I group |
520 | may either be a numeric gid or a group name. The default is not to |
521 | change the group of the file once it's created. The synonym |
522 | .B gid |
523 | is accepted in place of |
524 | .BR group . |
525 | .OE |
526 | . |
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527 | .SS "The `file' source and target types" |
528 | The |
529 | .B file |
530 | source and target allow data to move to and from objects other |
531 | than sockets within the Unix filesystem. (Unix-domain sockets are |
532 | handled using the |
533 | .B socket |
534 | source and target.) |
535 | .PP |
536 | If a |
537 | .B file |
538 | is used as a source, it is set up immediately. |
539 | .PP |
540 | The syntax of |
541 | .B file |
542 | sources and targets is like this: |
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543 | .GS "File sources and targets" |
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544 | .I source |
545 | ::= |
546 | .I file |
547 | .br |
548 | .I target |
549 | ::= |
550 | .I file |
551 | .br |
552 | .I file |
553 | ::= |
554 | .B file |
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555 | .RB [ .\& ] |
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556 | .I fspec |
557 | .RB [ , |
558 | .IR fspec ] |
559 | .br |
560 | .I fspec |
561 | ::= |
562 | .I fd-spec |
563 | | |
564 | .I name-spec |
565 | | |
566 | .I null-spec |
567 | .br |
568 | .I fd-spec |
569 | ::= |
570 | .RB [[ : ] fd [ : ]] |
571 | .IR number \c |
572 | .RB | stdin | stdout |
573 | .br |
574 | .I name-spec |
575 | ::= |
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576 | .RB [[ : ] name [ : ]] |
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577 | .I file-name |
578 | .br |
579 | .I file-name |
580 | ::= |
581 | .I path-seq |
582 | | |
583 | .B [ |
584 | .I path-seq |
585 | .B ] |
586 | .br |
587 | .I path-seq |
588 | ::= |
589 | .I path-elt |
590 | | |
591 | .I path-seq |
592 | .I path-elt |
593 | .br |
594 | .I path-elt |
595 | ::= |
596 | .B / |
597 | | |
598 | .I word |
599 | .br |
600 | .I null-spec |
601 | ::= |
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602 | .RB [ : ] null [ : ] |
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603 | .GE |
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604 | The |
605 | .I file |
606 | specification describes two files, the first to be used as input, the |
607 | second to be used as output, each described by an |
608 | .IR fspec . |
609 | .PP |
610 | If none of the keywords |
611 | .RB ` fd ', |
612 | .RB ` name ' |
613 | or |
614 | .RB ` null ' |
615 | are given, the type of an |
616 | .I fspec |
617 | is deduced from its nature: if it matches one of the strings |
618 | .RB ` stdin ' |
619 | or |
620 | .RB ` stdout ', |
621 | or begins with a digit, it's considered to be a file descriptor; |
622 | otherwise it's interpreted as a filename. |
623 | .PP |
624 | A |
625 | .RB ` name ' |
626 | spec describes a file by its name within the filesystem. It is opened |
627 | when needed and closed again after use. For output files, the precise |
628 | behaviour is controlled by options described below. |
629 | .PP |
630 | A |
631 | .RB ` null ' |
632 | spec attaches the input or output of the source or target to |
633 | .BR /dev/null . |
634 | .PP |
635 | An |
636 | .RB ` fd ' |
637 | spec uses an existing open file descriptor, given either by number or a |
638 | symbolic name. The name |
639 | .RB ` stdin ' |
640 | refers to standard input (file descriptor 0 on normal systems) and |
641 | .RB ` stdout ' |
642 | refers to standard output (file descriptor 1). The names work in |
643 | exactly the same way as the equivalent file descriptor numbers. |
644 | .PP |
645 | If the output |
646 | .I fspec |
647 | is omitted, the input |
648 | .I fspec |
649 | is used for both input and output. Exception: if the input refers to |
650 | standard input then the output will refer to standard output instead. |
651 | .PP |
652 | All |
653 | .B file |
654 | options apply equally to sources and targets. The options are as |
655 | follows: |
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656 | .OS "File options" |
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657 | .B file.create |
658 | .RB [ = ] |
659 | .BR yes | no |
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660 | .OD |
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661 | Whether to create the output file if it doesn't exist. If |
662 | .B no |
663 | (the default), an error is reported if the file doesn't exist. If |
664 | .BR yes , |
665 | the file is created if it doesn't exist. |
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666 | .OE |
667 | .OS "File options" |
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668 | .B file.open |
669 | .RB [ = ] |
670 | .BR no | truncate | append |
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671 | .OD |
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672 | Controls the behaviour if the output file already exists. If |
673 | .BR no , |
674 | an error is reported. If |
675 | .B truncate |
676 | (the default), the existing file is replaced by the new data. If |
677 | .BR append , |
678 | the new data is appended to the file. |
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679 | .OE |
680 | .OS "File options" |
681 | .BR file.fattr.* |
682 | .OD |
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683 | The |
684 | .B file |
685 | source and target also accept |
686 | .B fattr |
333c51f4 |
687 | options for controlling the attributes of the created file. |
688 | .OE |
667fb920 |
689 | .PP |
333c51f4 |
690 | Under no circumstances will |
691 | .B fw |
692 | create a file through a `dangling' symbolic link. |
667fb920 |
693 | . |
694 | .SS "The `exec' source and target types" |
695 | The |
696 | .B exec |
697 | source and target execute programs and allow access to their standard |
698 | input and output streams. Both source and target have the same syntax, |
699 | which is as follows: |
333c51f4 |
700 | .GS "Exec source and target" |
667fb920 |
701 | .I source |
702 | ::= |
703 | .I exec |
704 | .br |
705 | .I target |
706 | ::= |
707 | exec |
708 | .br |
709 | .I exec |
710 | ::= |
711 | .BR exec |
23be5eb0 |
712 | .RB [ .\& ] |
667fb920 |
713 | .I cmd-spec |
714 | .br |
715 | .I cmd-spec |
716 | ::= |
717 | .I shell-cmd |
10a454ad |
718 | | |
667fb920 |
719 | .RI [ prog-name ] |
720 | .B [ |
721 | .I argv0 |
722 | .I arg-seq |
723 | .B ] |
724 | .br |
725 | .I arg-seq |
726 | ::= |
727 | .I word |
728 | | |
729 | .I arg-seq |
730 | .I word |
731 | .br |
732 | .I shell-cmd |
733 | ::= |
734 | .I word |
735 | .br |
736 | .I argv0 |
737 | ::= |
738 | .I word |
333c51f4 |
739 | .GE |
667fb920 |
740 | If a single word is given, it is a |
741 | .I shell-cmd |
742 | and will be passed to the Bourne shell for execution. If a |
743 | bracket-enclosed sequence of words is given, it is considered to be a |
744 | list of arguments to pass to the program: if a |
745 | .I prog-name |
746 | is also supplied, it names the file containing the program to execute; |
747 | otherwise the file named by the first argument |
748 | .RI ( argv0 ) |
749 | is used. |
750 | .PP |
49f5947b |
751 | Note that the shell command or program name string must, if present, |
752 | have any delimiter characters (including |
753 | .RB ` / ' |
754 | and |
755 | .RB ` . ') |
756 | quoted; this is not required in the |
757 | .RB ` [ '-enclosed |
758 | argument list. |
759 | .PP |
667fb920 |
760 | The standard input and output of the program are forwarded to the other |
761 | end of the connection. The standard error stream is caught by |
762 | .B fw |
763 | and logged. |
764 | .PP |
765 | The |
766 | .B exec |
767 | source and target both understand the same set of options. The list of |
768 | options supported is as follows: |
333c51f4 |
769 | .OS "Exec options" |
667fb920 |
770 | .B exec.logging |
771 | .RB [ = ] |
772 | .BR yes | no |
333c51f4 |
773 | .OD |
667fb920 |
774 | Whether to log the start and end of executed programs. If |
775 | .B yes |
776 | (the default), a log message is emitted when the program is started |
777 | listing its process id, and another is emitted when the program finishes |
778 | giving its process id and exit status. If |
779 | .BR no , |
780 | these messages are not emitted. However the standard error stream is |
781 | still logged. The |
782 | .B log |
783 | abbreviation is accepted as a synonym for |
784 | .BR logging . |
333c51f4 |
785 | .OE |
786 | .OS "Exec options" |
667fb920 |
787 | .B exec.dir |
788 | .RB [ = ] |
789 | .I file-name |
333c51f4 |
790 | .OD |
667fb920 |
791 | Sets the current directory from which the the program should be run. |
792 | The default is not to change directory. The synonyms |
793 | .BR cd , |
794 | .B chdir |
795 | and |
796 | .B cwd |
797 | are accepted in place of |
798 | .BR dir . |
333c51f4 |
799 | .OE |
800 | .OS "Exec options" |
667fb920 |
801 | .B exec.root |
802 | .RB [ = ] |
803 | .I file-name |
333c51f4 |
804 | .OD |
667fb920 |
805 | Sets the root directory for the program, using the |
806 | .BR chroot (2) |
807 | system call. You must be the superuser for this option to work. The |
372a98e2 |
808 | default is not to set a root directory. The synonym |
809 | .B chroot |
810 | is accepted in place of |
811 | .BR root . |
333c51f4 |
812 | .OE |
813 | .OS "Exec options" |
667fb920 |
814 | .B exec.user |
815 | .RB [ = ] |
816 | .I user |
333c51f4 |
817 | .OD |
667fb920 |
818 | Sets the user (real and effective uid) to run the program as. This will |
819 | usually require superuser privileges to work. The default is not to |
820 | change uid. The synonym |
821 | .B uid |
822 | is accepted in place of |
823 | .BR user . |
333c51f4 |
824 | .OE |
825 | .OS "Exec options" |
667fb920 |
826 | .B exec.group |
827 | .RB [ = ] |
828 | .I group |
333c51f4 |
829 | .OD |
667fb920 |
830 | Sets the group (real and effective gid) to run the program as. If |
831 | running with superuser privileges, the supplementary groups list is |
832 | cleared at the same time. The default is not to change gid (or clear |
833 | the supplementary groups list). The synonym |
834 | .B gid |
835 | is accepted in place of |
836 | .BR group . |
333c51f4 |
837 | .OE |
838 | .OS "Exec options" |
667fb920 |
839 | .BI exec.rlimit. limit \c |
840 | .RB [ .hard | .soft ] |
841 | .RB [ = ] |
842 | .I value |
333c51f4 |
843 | .OD |
667fb920 |
844 | Set resource limits for the program. The |
845 | .I limit |
846 | may be one of the resource limit names described in |
847 | .BR setrlimit (2), |
848 | in lower-case and without the |
849 | .B RLIMIT_ |
850 | prefix; for example, |
851 | .B RLIMIT_CORE |
852 | becomes simply |
853 | .BR core . |
854 | The |
855 | .I value |
856 | is a number, followed optionally by |
857 | .B k |
858 | to multiply by 1024 (2\*(ss10\*(se), |
859 | .B m |
860 | to multiply by 1048576 (2\*(ss20\*(se), or |
861 | .B g |
862 | to multiply by 1073741824 (2\*(ss30\*(se); purists can use upper-case |
863 | versions of these if they want. If |
864 | .B .hard |
865 | or |
866 | .B .soft |
867 | was specified, only the hard or soft limit is set; otherwise both are |
868 | set to the same value. Only the superuser can raise the hard limit. |
869 | The soft limit cannot be set above the hard limit. |
333c51f4 |
870 | .OE |
871 | .OS "Exec options" |
667fb920 |
872 | .B exec.env.clear |
333c51f4 |
873 | .OD |
667fb920 |
874 | Clears the program's environment. |
333c51f4 |
875 | .OE |
667fb920 |
876 | .PP |
877 | .B exec.env.unset |
878 | .I var |
333c51f4 |
879 | .OD |
667fb920 |
880 | Removes |
881 | .I var |
882 | from the program's environment. It is not an error if no variable named |
883 | .I var |
884 | exists. |
333c51f4 |
885 | .OE |
886 | .OS "Exec options" |
667fb920 |
887 | .BR exec.env. [ set ] |
888 | .I var |
889 | .RB [ = ] |
890 | .I value |
333c51f4 |
891 | .OD |
96bc31ba |
892 | Assigns the variable |
667fb920 |
893 | .I var |
894 | the value |
895 | .I value |
896 | in the program's environment, possibly replacing the existing value. |
897 | The |
898 | .B set |
899 | may be omitted if the |
900 | .B env |
901 | qualifier is present. |
333c51f4 |
902 | .OE |
667fb920 |
903 | .PP |
904 | Note that environment variable modifications are performed in order, |
905 | global modifications before local ones. |
906 | . |
907 | .SS "The `socket' source and target types" |
908 | The |
909 | .B socket |
910 | source and target provide access to network services. Support is |
911 | currently provided for TCP/IP and Unix-domain sockets, although other |
912 | address types can be added with reasonable ease. |
913 | .PP |
914 | The syntax for socket sources and targets is: |
333c51f4 |
915 | .GS "Socket source and target" |
667fb920 |
916 | .ll +8i |
917 | .I source |
918 | ::= |
919 | .I socket-source |
10a454ad |
920 | .br |
667fb920 |
921 | .I target |
922 | ::= |
923 | .I socket-target |
924 | .br |
925 | .I socket-source |
926 | ::= |
23be5eb0 |
927 | .RB [ socket [ .\& ]] |
667fb920 |
928 | .RB [[ : ] \c |
929 | .IR addr-type \c |
930 | .RB [ : ]] |
931 | .I source-addr |
932 | .br |
933 | .I socket-target |
934 | ::= |
23be5eb0 |
935 | .RB [ socket [ .\& ]] |
667fb920 |
936 | .RB [[ : ] \c |
937 | .IR addr-type \c |
938 | .RB [ : ]] |
939 | .I target-addr |
940 | .ll -8i |
333c51f4 |
941 | .GE |
667fb920 |
942 | The syntax of the source and target addresses depend on the address |
943 | types, which are described below. The default address type, if no |
944 | .I addr-type |
945 | is given, is |
946 | .BR inet . |
947 | .PP |
948 | Socket sources support options; socket targets do not. The source |
949 | options provided are: |
333c51f4 |
950 | .OS "Socket options" |
667fb920 |
951 | .B socket.conn |
952 | .RB [ = ] |
d857515e |
953 | .IR number | \c |
954 | .BR unlimited | one-shot |
333c51f4 |
955 | .OD |
d857515e |
956 | Controls the behaviour of the source when it receives connections. A |
667fb920 |
957 | .I number |
d857515e |
958 | limits the number of simultaneous connections. The value |
959 | .B unlimited |
960 | (or |
961 | .BR infinite ) |
962 | removes any limit on the number of connections possible. The value |
963 | .B one-shot |
964 | will remove the socket source after a single successful connection. |
965 | (Connections refused by access control systems don't count here.) |
966 | The default is to apply a limit of 256 concurrent connections. Use of |
967 | the |
968 | .B unlimited |
969 | option is not recommended. |
333c51f4 |
970 | .OE |
971 | .OS "Socket options" |
6f427571 |
972 | .B socket.listen |
973 | .RB [ = ] |
974 | .I number |
975 | .OD |
976 | Sets the maximum of the kernel incoming connection queue for this socket |
977 | source. This is the number given to the |
978 | .BR listen (2) |
979 | system call. The default is 5. |
980 | .OE |
981 | .OS "Socket options" |
667fb920 |
982 | .B socket.logging |
983 | .RB [ = ] |
984 | .BR yes | no |
333c51f4 |
985 | .OD |
667fb920 |
986 | Whether to log incoming connections. If |
987 | .B yes |
988 | (the default) incoming connections are logged, together with information |
989 | about the client (where available) and whether the connection was |
990 | accepted or refused. If |
991 | .BR no , |
992 | log messages are not generated. |
333c51f4 |
993 | .OE |
667fb920 |
994 | .PP |
995 | Address types also provide their own options. |
996 | . |
997 | .SS "The `inet' socket address type" |
998 | The |
999 | .B inet |
1000 | address type provides access to TCP ports. The |
1001 | .B inet |
1002 | source and target addresses have the following syntax: |
333c51f4 |
1003 | .GS "Socket source and target" |
667fb920 |
1004 | .I inet-source-addr |
10a454ad |
1005 | ::= |
10a454ad |
1006 | .RB [ port ] |
1007 | .I port |
667fb920 |
1008 | .br |
1009 | .I inet-target-addr |
1010 | ::= |
1011 | .I address |
10a454ad |
1012 | .RB [ : ] |
1013 | .I port |
10a454ad |
1014 | .br |
667fb920 |
1015 | .I address |
10a454ad |
1016 | ::= |
667fb920 |
1017 | .I addr-elt |
1018 | | |
1019 | .I address |
1020 | .I addr-elt |
10a454ad |
1021 | .br |
667fb920 |
1022 | .I addr-elt |
10a454ad |
1023 | ::= |
23be5eb0 |
1024 | .B .\& |
10a454ad |
1025 | | |
667fb920 |
1026 | .I word |
333c51f4 |
1027 | .GE |
667fb920 |
1028 | A |
1029 | .I port |
1030 | may be given as a port number or a service name from the |
1031 | .B /etc/services |
1032 | file (or YP map if you do that sort of thing). A |
1033 | .B hostname |
1034 | may be a textual hostname or a numerical IP address. |
1035 | .PP |
1036 | The |
1037 | .B inet |
1038 | source address accepts the following options: |
333c51f4 |
1039 | .OS "Socket options" |
1c2054c7 |
1040 | .B socket.inet.source.addr |
1041 | .RB [ = ] |
1042 | .RR any | \c |
1043 | .I addr |
1044 | .OD |
1045 | Specify the IP address on which to listen for incoming connections. The |
1046 | default is |
1047 | .BR any , |
1048 | which means to listen on all addresses, though it may be useful to |
1049 | specify this explicitly, if the global setting is different. |
1050 | .OE |
1051 | .OS "Socket options" |
1052 | .BR socket.inet.source. [ allow | deny ] |
1053 | .RB [ host ] |
1054 | .I addr |
10a454ad |
1055 | .RB [ / |
1c2054c7 |
1056 | .IR addr ] |
333c51f4 |
1057 | .OD |
667fb920 |
1058 | Adds an entry to the source's access control list. If only one |
1059 | .I address |
1060 | is given, the entry applies only to that address; if two are given, the |
1061 | first is a network address and the second is a netmask either in |
1062 | dotted-quad format or a simple number of bits (e.g., |
1063 | .B /255.255.255.192 |
1064 | and |
1065 | .B /26 |
1066 | mean the same), and the entry applies to any address which, when masked |
1067 | by the netmask, is equal to the masked network address. |
333c51f4 |
1068 | .OE |
1c2054c7 |
1069 | .OS "Socket options" |
1070 | .BR socket.inet.source. [ allow | deny ] |
1071 | .B priv-port |
1072 | .OD |
1073 | Accept or reject connections from low-numbered `privileged' ports, in |
1074 | the range 0--1023. |
1075 | .OE |
1076 | .OS "Socket options" |
1077 | .B socket.inet.dest.addr |
1078 | .RB [ = ] |
1079 | .RR any | \c |
1080 | .I addr |
1081 | .OD |
1082 | Specify the IP address to bind the local socket to when making an |
1083 | outbound connection. The default is |
1084 | .BR any , |
1085 | which means to use whichever address the kernel thinks is most |
1086 | convenient. This option is useful if the destination is doing |
1087 | host-based access control and your server is multi-homed. |
1088 | .OE |
ee599f55 |
1089 | .OS "Socket options" |
1090 | .B socket.inet.dest.priv-port |
1091 | .RB [=] |
1092 | .BR yes | no |
1093 | .OD |
1094 | Make a privileged connection (i.e., from a low-numbered port) to the |
1095 | target. This only works if |
1096 | .B fw |
1097 | was started with root privileges. However, it still works if |
1098 | .B fw |
1099 | has |
1100 | .I dropped |
1101 | privileges after initialization (the |
1102 | .B \-s |
1103 | option). Before dropping privileges, |
1104 | .B fw |
1105 | forks off a separate process which continues to run with root |
1106 | privileges, and on demand passes sockets bound to privileged ports and |
1107 | connected to the appropriate peer back to the main program. The |
1108 | privileged child only passes back sockets connected to peer addresses |
1109 | named in the configuration; even if the |
1110 | .B fw |
1111 | process is compromised, it can't make privileged connections to other |
1112 | addresses. Note that because of this privilege separation, it's also |
1113 | not possible to reconfigure |
1114 | .B fw |
69c8e834 |
1115 | to make privileged connections to different peer addresses later by |
ee599f55 |
1116 | changing configuration files and sending the daemon a |
1117 | .BR SIGHUP . |
1118 | .OE |
10a454ad |
1119 | .PP |
333c51f4 |
1120 | The access control rules are examined in the order: local entries first, |
1121 | then global ones, each in the order given in the configuration file. |
1122 | The first matching entry is used. If no entries match, the behaviour is |
1123 | the |
667fb920 |
1124 | .I opposite |
1125 | of the last entry tried. If there are no entries defined, the default |
1126 | is to allow all clients. |
667fb920 |
1127 | . |
1128 | .SS "The `unix' socket address type" |
10a454ad |
1129 | The |
667fb920 |
1130 | .B unix |
1131 | address type allows access to Unix-domain sockets. The syntax for |
1132 | .B unix |
1133 | source and target addresses is like this: |
333c51f4 |
1134 | .GS "Socket source and target" |
1135 | .I unix-source-addr |
667fb920 |
1136 | ::= |
333c51f4 |
1137 | .I file-name |
667fb920 |
1138 | .br |
333c51f4 |
1139 | .I unix-target-addr |
667fb920 |
1140 | ::= |
1141 | .I file-name |
333c51f4 |
1142 | .GE |
1143 | The following options are supported by the |
1144 | .B unix |
1145 | source address type: |
1146 | .OS "Socket options" |
1147 | .BR socket.unix.fattr. * |
1148 | .OD |
667fb920 |
1149 | The |
1150 | .B unix |
1151 | source address accepts |
1152 | .B fattr |
333c51f4 |
1153 | options to control the attributes of the socket file created. |
1154 | .OE |
1155 | .PP |
1156 | Sockets are removed if |
10a454ad |
1157 | .B fw |
667fb920 |
1158 | exits normally (which it will do if it runs out of sources or |
372a98e2 |
1159 | connections, or if |
1160 | .B fw |
1161 | shuts down in a clean way). |
667fb920 |
1162 | .SH "EXAMPLES" |
1163 | To forward the local port 25 to a main mail server: |
1164 | .VS |
1165 | from 25 to mailserv:25 |
1166 | .VE |
1167 | To attach a fortune server to a Unix-domain socket: |
1168 | .VS |
1169 | from unix:/tmp/fortunes |
1170 | to exec [/usr/games/fortune] { user nobody } |
1171 | .VE |
1172 | To fetch a fortune from the server: |
1173 | .VS |
1174 | from file stdin, stdout to unix:/tmp/fortunes |
1175 | .VE |
1176 | To emulate |
1177 | .BR cat (1): |
1178 | .VS |
49f5947b |
1179 | from file stdin, null to file null, stdout |
667fb920 |
1180 | .VE |
69c8e834 |
1181 | .sp -1 \" undo final space |
667fb920 |
1182 | . |
1183 | .\"-------------------------------------------------------------------------- |
372a98e2 |
1184 | .SH "SIGNAL HANDLING" |
1185 | . |
1186 | The |
1187 | .B fw |
1188 | program responds to various signals when it's running. If it receives |
1189 | .B SIGTERM |
1190 | or |
1191 | .BR SIGINT , |
1192 | .B fw |
1193 | performs a |
1194 | .I graceful |
1195 | shutdown: it removes all of its sources, and will exit when no more |
1196 | connections are running. (Note that if the disposition |
1197 | .B SIGINT |
1198 | was to ignore it, |
1199 | .B fw |
1200 | does not re-enable the signal. You'll have to send |
1201 | .B SIGTERM |
1202 | in that case.) If |
1203 | .B fw |
1204 | receives |
1205 | .BR SIGQUIT , |
1206 | it performs an |
1207 | .I abrupt |
1208 | shutdown: it removes all sources and extant connections and closes down |
1209 | more-or-less immediately. |
1210 | .PP |
1211 | Finally, if any configuration files (other than standard input) were |
1212 | provided to |
1213 | .B fw |
1214 | on its command line using the |
1215 | .B \-f |
1216 | option, a |
1217 | .B SIGHUP |
1218 | signal may be sent to instruct |
1219 | .B fw |
1220 | to reload its configuration. Any existing connections are allowed to |
1221 | run their course. If no such configuration files are available, |
1222 | .B fw |
1223 | just logs a message about the signal and continues. |
372a98e2 |
1224 | . |
1225 | .\"-------------------------------------------------------------------------- |
333c51f4 |
1226 | .SH "GRAMMAR SUMMARY" |
1227 | . |
1228 | .SS "Basic syntax" |
1229 | .I file |
1230 | ::= |
1231 | .I empty |
1232 | | |
1233 | .I file |
1234 | .I stmt |
1235 | .RB [ ; ] |
1236 | .br |
1237 | .I stmt |
1238 | ::= |
1239 | .I option-stmt |
1240 | | |
1241 | .I fw-stmt |
1242 | .br |
1243 | .I fw-stmt |
1244 | ::= |
1245 | .B fw |
1246 | .I source |
1247 | .I options |
1248 | .RB [ to | \-> ] |
1249 | .I target |
1250 | .I options |
1251 | .br |
1252 | .I options |
1253 | ::= |
1254 | .B { |
1255 | .I option-seq |
1256 | .B } |
1257 | .br |
1258 | .I option-seq |
1259 | ::= |
1260 | .I empty |
1261 | | |
1262 | .I option-stmt |
1263 | .RB [ ; ] |
1264 | .I option-seq |
1265 | . |
1266 | .SS "Option syntax" |
1267 | .I option-stmt |
1268 | ::= |
1269 | .I q-option |
1270 | .br |
1271 | .I q-option |
1272 | ::= |
1273 | .I option |
1274 | .br |
1275 | | |
1276 | .I prefix |
23be5eb0 |
1277 | .B .\& |
333c51f4 |
1278 | .I q-option |
1279 | .br |
1280 | | |
1281 | .I prefix |
1282 | .B { |
1283 | .I option-seq |
1284 | .B } |
1285 | .br |
1286 | .I prefix |
1287 | ::= |
1288 | .I word |
1289 | . |
1290 | .SS "File source and target" |
1291 | .I source |
1292 | ::= |
1293 | .I file |
1294 | .br |
1295 | .I target |
1296 | ::= |
1297 | .I file |
1298 | .br |
1299 | .I file |
1300 | ::= |
1301 | .B file |
23be5eb0 |
1302 | .RB [ .\& ] |
333c51f4 |
1303 | .I fspec |
1304 | .RB [ , |
1305 | .IR fspec ] |
1306 | .br |
1307 | .I fspec |
1308 | ::= |
1309 | .I fd-spec |
1310 | | |
1311 | .I name-spec |
1312 | | |
1313 | .I null-spec |
1314 | .br |
1315 | .I fd-spec |
1316 | ::= |
1317 | .RB [[ : ] fd [ : ]] |
1318 | .IR number \c |
1319 | .RB | stdin | stdout |
1320 | .br |
1321 | .I name-spec |
1322 | ::= |
b69a615b |
1323 | .RB [[ : ] name [ : ]] |
333c51f4 |
1324 | .I file-name |
1325 | .br |
1326 | .I file-name |
1327 | ::= |
1328 | .I path-seq |
1329 | | |
1330 | .B [ |
1331 | .I path-seq |
1332 | .B ] |
1333 | .br |
1334 | .I path-seq |
1335 | ::= |
1336 | .I path-elt |
1337 | | |
1338 | .I path-seq |
1339 | .I path-elt |
1340 | .br |
1341 | .I path-elt |
1342 | ::= |
1343 | .B / |
1344 | | |
1345 | .I word |
1346 | .br |
1347 | .I null-spec |
1348 | ::= |
1349 | .RB [ : ] null [ : ] |
1350 | . |
1351 | .SS "Exec source and target" |
1352 | .I source |
1353 | ::= |
1354 | .I exec |
1355 | .br |
1356 | .I target |
1357 | ::= |
1358 | exec |
1359 | .br |
1360 | .I exec |
1361 | ::= |
1362 | .BR exec |
23be5eb0 |
1363 | .RB [ .\& ] |
333c51f4 |
1364 | .I cmd-spec |
1365 | .br |
1366 | .I cmd-spec |
1367 | ::= |
1368 | .I shell-cmd |
1369 | | |
1370 | .RI [ prog-name ] |
1371 | .B [ |
1372 | .I argv0 |
1373 | .I arg-seq |
1374 | .B ] |
1375 | .br |
1376 | .I arg-seq |
1377 | ::= |
1378 | .I word |
1379 | | |
1380 | .I arg-seq |
1381 | .I word |
1382 | .br |
1383 | .I shell-cmd |
1384 | ::= |
1385 | .I word |
1386 | .br |
1387 | .I argv0 |
1388 | ::= |
1389 | .I word |
1390 | . |
1391 | .SS "Socket source and target" |
1392 | .ll +8i |
1393 | .I source |
1394 | ::= |
1395 | .I socket-source |
1396 | .br |
1397 | .I target |
1398 | ::= |
1399 | .I socket-target |
1400 | .br |
1401 | .I socket-source |
1402 | ::= |
23be5eb0 |
1403 | .RB [ socket [ .\& ]] |
333c51f4 |
1404 | .RB [[ : ] \c |
1405 | .IR addr-type \c |
1406 | .RB [ : ]] |
1407 | .I source-addr |
1408 | .br |
1409 | .I socket-target |
1410 | ::= |
23be5eb0 |
1411 | .RB [ socket [ .\& ]] |
333c51f4 |
1412 | .RB [[ : ] \c |
1413 | .IR addr-type \c |
1414 | .RB [ : ]] |
1415 | .I target-addr |
1416 | .ll -8i |
1417 | .PP |
1418 | .I inet-source-addr |
1419 | ::= |
1420 | .RB [ port ] |
1421 | .I port |
1422 | .br |
1423 | .I inet-target-addr |
1424 | ::= |
1425 | .I address |
1426 | .RB [ : ] |
1427 | .I port |
1428 | .br |
1429 | .I address |
1430 | ::= |
1431 | .I addr-elt |
1432 | | |
1433 | .I address |
1434 | .I addr-elt |
1435 | .br |
1436 | .I addr-elt |
1437 | ::= |
23be5eb0 |
1438 | .B .\& |
333c51f4 |
1439 | | |
1440 | .I word |
1441 | .PP |
1442 | .I unix-source-addr |
1443 | ::= |
1444 | .I file-name |
1445 | .br |
1446 | .I unix-target-addr |
1447 | ::= |
1448 | .I file-name |
1449 | . |
1450 | .\"-------------------------------------------------------------------------- |
1451 | .SH "OPTION SUMMARY" |
1452 | . |
1453 | .SS "File attributes (`fattr')" |
1454 | .IB prefix .fattr.mode |
1455 | .RB [ = ] |
1456 | .I mode |
1457 | .br |
1458 | .IB prefix .fattr.owner |
1459 | .RB [ = ] |
1460 | .I user |
1461 | .br |
1462 | .IB prefix .fattr.group |
1463 | .RB [ = ] |
1464 | .I group |
1465 | . |
1466 | .SS "File options" |
1467 | .B file.create |
1468 | .RB [ = ] |
1469 | .BR yes | no |
1470 | .br |
1471 | .B file.open |
1472 | .RB [ = ] |
1473 | .BR no | truncate | append |
1474 | .br |
1475 | .BR file.fattr. * |
1476 | . |
1477 | .SS "Exec options" |
1478 | .B exec.logging |
1479 | .RB [ = ] |
1480 | .BR yes | no |
1481 | .br |
1482 | .B exec.dir |
1483 | .RB [ = ] |
1484 | .I file-name |
1485 | .br |
1486 | .B exec.root |
1487 | .RB [ = ] |
1488 | .I file-name |
1489 | .br |
1490 | .B exec.user |
1491 | .RB [ = ] |
1492 | .I user |
1493 | .br |
1494 | .B exec.group |
1495 | .RB [ = ] |
1496 | .I group |
1497 | .br |
1498 | .BI exec.rlimit. limit \c |
1499 | .RB [ .hard | .soft ] |
1500 | .RB [ = ] |
1501 | .I value |
1502 | .br |
1503 | .B exec.env.clear |
1504 | .br |
1505 | .B exec.env.unset |
1506 | .I var |
1507 | .br |
1508 | .BR exec.env. [ set ] |
1509 | .I var |
1510 | .RB [ = ] |
1511 | .I value |
1512 | . |
1513 | .SS "Socket options" |
1514 | .B socket.conn |
1515 | .RB [ = ] |
d857515e |
1516 | .IR number | \c |
1517 | .BR unlimited | one-shot |
333c51f4 |
1518 | .br |
6f427571 |
1519 | .B socket.listen |
1520 | .RB [ = ] |
1521 | .I number |
1522 | .br |
333c51f4 |
1523 | .B socket.logging |
1524 | .RB [ = ] |
1525 | .BR yes | no |
1526 | .PP |
1c2054c7 |
1527 | .BR socket.inet.source. [ allow | deny ] |
1528 | .RB [ host ] |
1529 | .I addr |
333c51f4 |
1530 | .RB [ / |
1c2054c7 |
1531 | .IR addr ] |
1532 | .br |
1533 | .BR socket.inet.source. [ allow | deny ] |
1534 | .B priv-port |
1535 | .br |
1536 | .B socket.inet.source.addr |
1537 | .RB [ = ] |
1538 | .BR any | \c |
1539 | .I addr |
1540 | .br |
1541 | .B socket.inet.dest.addr |
1542 | .RB [ = ] |
1543 | .BR any | \c |
1544 | .I addr |
ee599f55 |
1545 | .br |
1546 | .B socket.inet.dest.priv-port |
1547 | .RB [=] |
1548 | .BR yes | no |
333c51f4 |
1549 | .PP |
1550 | .BR socket.unix.fattr. * |
1551 | . |
1552 | .\"-------------------------------------------------------------------------- |
10a454ad |
1553 | .SH "BUGS" |
667fb920 |
1554 | . |
cdc917d3 |
1555 | The syntax for IP addresses and filenames is nasty. |
10a454ad |
1556 | .PP |
d857515e |
1557 | IPv6 is not supported yet. Because of |
1558 | .BR fw 's |
1559 | socket address architecture, it's probably not a major piece of work to |
667fb920 |
1560 | add. |
10a454ad |
1561 | .PP |
667fb920 |
1562 | Please inform me of any security problems you think you've identified in |
1563 | this program. I take security very seriously, and I will fix security |
1564 | holes as a matter of priority when I find out about them. I will be |
1565 | annoyed if I have to read about problems on Bugtraq because they weren't |
1566 | mailed to me first. |
723210e6 |
1567 | .PP |
1568 | The program is too complicated, and this manual page is too long. |
667fb920 |
1569 | . |
1570 | .\"-------------------------------------------------------------------------- |
10a454ad |
1571 | .SH "AUTHOR" |
667fb920 |
1572 | . |
10a454ad |
1573 | Mark Wooding, <mdw@nsict.org> |
667fb920 |
1574 | . |
1575 | .\"----- That's all, folks -------------------------------------------------- |