Commit | Line | Data |
---|---|---|
10a454ad | 1 | .\" -*-nroff-*- |
667fb920 | 2 | .\" |
9155ea97 | 3 | .\" Manual page for fwd |
667fb920 | 4 | .\" |
5 | .\" (c) 1999 Straylight/Edgeware | |
6 | .\" | |
7 | . | |
8 | .\"----- Licensing notice --------------------------------------------------- | |
206212ca | 9 | .\" |
9155ea97 | 10 | .\" This file is part of the `fwd' port forwarder. |
206212ca | 11 | .\" |
9155ea97 | 12 | .\" `fwd' is free software; you can redistribute it and/or modify |
667fb920 | 13 | .\" it under the terms of the GNU General Public License as published by |
14 | .\" the Free Software Foundation; either version 2 of the License, or | |
15 | .\" (at your option) any later version. | |
206212ca | 16 | .\" |
9155ea97 | 17 | .\" `fwd' is distributed in the hope that it will be useful, |
667fb920 | 18 | .\" but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | .\" GNU General Public License for more details. | |
206212ca | 21 | .\" |
667fb920 | 22 | .\" You should have received a copy of the GNU General Public License |
9155ea97 | 23 | .\" along with `fwd'; if not, write to the Free Software Foundation, |
667fb920 | 24 | .\" Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
25 | . | |
667fb920 | 26 | .\"----- Various bits of fancy styling -------------------------------------- |
27 | . | |
28 | .\" --- Indented paragraphs with right-aligned tags --- | |
29 | . | |
10a454ad | 30 | .de hP |
31 | .IP | |
32 | \h'-\w'\fB\\$1\ \fP'u'\fB\\$1\ \fP\c | |
33 | .. | |
667fb920 | 34 | . |
35 | .\" --- Verbatim-oid typesetting --- | |
36 | .de VS | |
37 | .sp 1 | |
38 | .RS | |
39 | .nf | |
40 | .ft B | |
41 | .. | |
42 | .de VE | |
43 | .ft R | |
44 | .fi | |
45 | .RE | |
46 | .sp 1 | |
47 | .. | |
48 | . | |
333c51f4 | 49 | .\" --- Grammar markup --- |
50 | .\" | |
51 | .\" This is mainly for the benefit of the automatic scripts which | |
52 | .\" generate the grammar summary. | |
53 | . | |
54 | .de GS | |
55 | .PP | |
56 | .. | |
57 | .de GE | |
58 | .PP | |
59 | .. | |
8cf7c7c2 MW |
60 | .de GL |
61 | .. | |
333c51f4 | 62 | . |
63 | .de OS | |
64 | .PP | |
65 | .. | |
66 | .de OD | |
67 | .RS | |
68 | .. | |
69 | .de OE | |
70 | .RE | |
71 | .. | |
8cf7c7c2 MW |
72 | .de OL |
73 | .. | |
333c51f4 | 74 | . |
667fb920 | 75 | .\" --- Other bits of styling --- |
76 | . | |
77 | .ie t \{\ | |
78 | . ds o \(bu | |
79 | . ds ss \s8\u | |
80 | . ds se \d\s0 | |
81 | . if \n(.g \{\ | |
82 | . fam P | |
83 | . \} | |
84 | .\} | |
85 | .el \{\ | |
86 | . ds o o | |
87 | . ds ss ^ | |
88 | . ds se | |
89 | .\} | |
90 | . | |
91 | .\"-------------------------------------------------------------------------- | |
92 | . | |
9155ea97 | 93 | .TH fwd 1 "1 July 1999" "Straylight/Edgeware" "fwd port forwarder" |
667fb920 | 94 | . |
95 | .\"-------------------------------------------------------------------------- | |
10a454ad | 96 | .SH NAME |
667fb920 | 97 | . |
9155ea97 | 98 | fwd \- port forwarder |
667fb920 | 99 | . |
100 | .\"-------------------------------------------------------------------------- | |
10a454ad | 101 | .SH SYNOPSIS |
667fb920 | 102 | . |
9155ea97 | 103 | .B fwd |
c42fddf3 | 104 | .RB [ \-dlq ] |
105 | .RB [ \-p | |
faf9726e | 106 | .IR file ] |
10a454ad | 107 | .RB [ \-f |
108 | .IR file ] | |
fc170a33 | 109 | .RB [ \-s |
110 | .IR user ] | |
111 | .RB [ \-g | |
112 | .IR group ] | |
10a454ad | 113 | .IR config-stmt ... |
667fb920 | 114 | . |
115 | .\"-------------------------------------------------------------------------- | |
116 | .SH "DESCRIPTION" | |
117 | . | |
10a454ad | 118 | The |
9155ea97 | 119 | .B fwd |
10a454ad | 120 | program is a simple port forwarder. It supports a number of features |
121 | the author hasn't found in similar programs: | |
122 | .TP | |
123 | .I "Connection logging" | |
124 | Each connection attempt to the forwarder is logged, giving the time of | |
125 | the connection, the DNS-resolved hostname (if available), and the user | |
126 | name resulting from an RFC931 lookup. These lookups are done | |
127 | asynchronously to the main forwarder's operation. | |
128 | .TP | |
129 | .I "Access control" | |
130 | Each forwarded port may have an access control list attached to it. | |
131 | Only authorized hosts are allowed to connect. Access control checks are | |
132 | performed by quick checks on the client's IP address. | |
133 | .TP | |
134 | .I "Nonblocking single-process design" | |
135 | The internal structure of the server is completely nonblocking. The | |
136 | connections don't block; the reading and writing don't block; the name | |
137 | lookups don't block. This is all done in a single process, with the | |
138 | single exception of the DNS resolver. | |
667fb920 | 139 | .TP |
140 | .I "Support for Unix-domain sockets" | |
141 | Connections from and to Unix-domain sockets can be handled just as | |
96bc31ba | 142 | easily as more normal Internet sockets. Access control doesn't work on |
667fb920 | 143 | Unix domain sockets, though. (Yet.) |
10a454ad | 144 | .SS "Command line options" |
145 | The | |
9155ea97 | 146 | .B fwd |
10a454ad | 147 | program understands a few simple command line options: |
148 | .TP | |
149 | .B "\-h, \-\-help" | |
150 | Displays a screen of help text on standard output and exits | |
151 | successfully. | |
152 | .TP | |
153 | .B "\-v, \-\-version" | |
154 | Writes the version number to standard output and exits successfully. | |
155 | .TP | |
156 | .B "\-u, \-\-usage" | |
157 | Writes a terse usage summary to standard output and exits successfully. | |
158 | .TP | |
fc170a33 | 159 | .B "\-G, \-\-grammar" |
160 | Writes a summary of the configuration file grammar to standard output | |
161 | and exits successfully. | |
162 | .TP | |
163 | .B "\-O, \-\-options" | |
164 | Writes a summary of the source and target options to standard output and | |
165 | exits successfully. | |
166 | .TP | |
10a454ad | 167 | .BI "\-f, \-\-file=" file |
168 | Read configuration information from | |
169 | .IR file . | |
667fb920 | 170 | Equivalent to an |
171 | .RB ` include | |
172 | .IR file ' | |
173 | configuration file statement. | |
10a454ad | 174 | .TP |
667fb920 | 175 | .B "\-d, \-\-daemon, \-\-fork" |
10a454ad | 176 | Forks into the background after reading the configuration and |
177 | initializing properly. | |
667fb920 | 178 | .TP |
370e3c14 | 179 | .B "\-l, \-\-syslog, \-\-log" |
180 | Emit logging information to the system log, rather than standard error. | |
181 | .TP | |
faf9726e | 182 | .BI "\-p, \-\-pidfile=" file |
4166ea7c | 183 | Write |
9155ea97 | 184 | .BR fwd 's |
4166ea7c | 185 | process-id to |
186 | .I file | |
187 | during start-up. If | |
188 | .B \-d | |
189 | is given too, then the process-id is written after forking (obviously). | |
190 | .TP | |
fc170a33 | 191 | .B "\-q, \-\-quiet" |
667fb920 | 192 | Don't output any logging information. This option is not recommended |
193 | for normal use, although it can make system call traces clearer so I use | |
194 | it when debugging. | |
fc170a33 | 195 | .TP |
196 | .BI "\-s, \-\-setuid=" user | |
197 | Change uid to that of | |
198 | .IR user , | |
199 | which may be either a user name or uid number, after initializing all | |
200 | the sources. This will usually require elevated privileges. | |
201 | .TP | |
202 | .BI "\-g, \-\-setgid=" group | |
203 | Change gid to that of | |
204 | .IR group , | |
205 | which may be either a group name or gid number, after initializing all | |
206 | the sources. If the operating system understands supplementary groups | |
207 | then the supplementary groups list is altered to include only | |
208 | .IR group . | |
10a454ad | 209 | .PP |
210 | Any further command line arguments are interpreted as configuration | |
211 | lines to be read. Configuration supplied in command line arguments has | |
212 | precisely the same syntax as configuration in files. If there are no | |
96bc31ba | 213 | configuration statements on the command line, and no |
10a454ad | 214 | .B \-f |
215 | options were supplied, configuration is read from standard input, if | |
216 | stdin is not a terminal. | |
667fb920 | 217 | . |
218 | .\"-------------------------------------------------------------------------- | |
219 | .SH "CONFIGURATION LANGUAGE" | |
220 | . | |
221 | The | |
9155ea97 | 222 | .B fwd |
667fb920 | 223 | program has a fairly sophisticated configuration language to let you |
224 | describe which things should be forwarded where and what special | |
225 | features there should be. | |
226 | .SS "Lexical structure" | |
227 | There are four types of characters. | |
228 | .TP | |
229 | .I "word constituent characters" | |
96bc31ba | 230 | Word constituent characters are gathered together into words. |
667fb920 | 231 | Depending on its surrounding context, a word might act as a keyword or a |
232 | string. All alphanumerics are word constituents, as is the hyphen | |
233 | .RB ` \- '. | |
234 | Other characters may change their status in future versions. | |
235 | .TP | |
236 | .I "self-delimiting characters" | |
237 | Self-delimiting characters always stand alone. They act as punctuation, | |
238 | shaping the sequence of words into more complex grammatical forms. The | |
239 | characters | |
240 | .RB ` { ', | |
241 | .RB ` } ', | |
242 | .RB ` [ ', | |
243 | .RB ` ] ', | |
244 | .RB ` / ', | |
245 | .RB ` , ', | |
246 | .RB ` = ', | |
247 | .RB ` : ', | |
248 | .RB ` ; ' | |
249 | and | |
250 | .RB ` . ' | |
251 | are self-delimiting. Note that while some characters, e.g., | |
252 | .RB ` [ ' | |
253 | and | |
254 | .RB ` ; ', | |
372a98e2 | 255 | require escaping by the shell, they are mostly optional in the grammar |
256 | and can tend to be omitted in quick hacks at the shell prompt. | |
667fb920 | 257 | .TP |
258 | .I "whitespace characters" | |
259 | Whitespace characters separate words but are otherwise ignored. All | |
260 | `normal' whitespace characters (e.g., space, tab and newline) are | |
261 | considered to be whitespace for these purposes. | |
262 | .TP | |
263 | .I "special characters" | |
206212ca | 264 | There are three special characters. The |
667fb920 | 265 | .RB ` # ' |
266 | character, if it appears at the start of a word, introduces a | |
267 | .I comment | |
268 | which extends to the end of the current line or command-line argument. | |
269 | Within a word, it behaves like a normal word-constituent character. The | |
270 | backslash | |
271 | .RB ` \e ' | |
272 | escapes the following character causing it to be interpreted as a word | |
273 | constituent regardless of its normal type. The double-quote | |
274 | .RB ` """" ' | |
275 | escapes all characters other than backslashes up to the next | |
276 | double-quote and causes them to be regarded as word constituents. Note | |
277 | that you don't have to quote a whole word. The backslash can escape a | |
278 | quote character allowing you to insert it into a word if really | |
279 | necessary. | |
280 | . | |
281 | .SS "Basic syntax" | |
282 | The overall syntax looks a bit like this: | |
333c51f4 | 283 | .GS "Basic syntax" |
667fb920 | 284 | .I file |
10a454ad | 285 | ::= |
667fb920 | 286 | .I empty |
287 | | | |
288 | .I file | |
289 | .I stmt | |
290 | .RB [ ; ] | |
10a454ad | 291 | .br |
292 | .I stmt | |
293 | ::= | |
667fb920 | 294 | .I option-stmt |
295 | | | |
9155ea97 | 296 | .I fwd-stmt |
667fb920 | 297 | .br |
9155ea97 | 298 | .I fwd-stmt |
667fb920 | 299 | ::= |
9155ea97 | 300 | .B fwd |
667fb920 | 301 | .I source |
302 | .I options | |
303 | .RB [ to | \-> ] | |
304 | .I target | |
305 | .I options | |
306 | .br | |
307 | .I options | |
308 | ::= | |
309 | .B { | |
310 | .I option-seq | |
311 | .B } | |
312 | .br | |
313 | .I option-seq | |
314 | ::= | |
315 | .I empty | |
316 | | | |
317 | .I option-stmt | |
318 | .RB [ ; ] | |
319 | .I option-seq | |
333c51f4 | 320 | .GE |
667fb920 | 321 | If you prefer, the keyword |
9155ea97 | 322 | .RB ` fwd ' |
667fb920 | 323 | may be spelt |
9155ea97 MW |
324 | .RB ` fwd ', |
325 | .RB ` forward ', | |
667fb920 | 326 | or |
327 | .RB ` from '. | |
328 | All are equivalent. | |
329 | . | |
330 | .SS "Sources and targets" | |
331 | Forwarding is set up by attaching | |
332 | .I targets | |
333 | to | |
334 | .IR sources . | |
335 | Sources are things which are capable of | |
336 | .I initiating | |
337 | one end of a data flow on their own, while targets are things which are | |
338 | capable of setting up the other end on demand. In the case of a TCP | |
339 | port forwarder, the part which listens for incoming client connections | |
340 | is the source, while the part which sets up outgoing connections to the | |
341 | destination server is the target. | |
342 | .PP | |
343 | Essentially, all | |
9155ea97 | 344 | .B fwd |
667fb920 | 345 | does is set up a collection of sources and targets based on your |
346 | configuration file so that when a source decides to initiate a data | |
347 | flow, it tells its target to set its end up, and then squirts data back | |
348 | and forth between the two until there's no more. | |
349 | .PP | |
350 | Some sources are | |
351 | .IR persistent : | |
352 | they stay around indefinitely setting up multiple attachments to | |
353 | targets. Others are | |
354 | .IR transient : | |
355 | they set up one connection and then disappear. If all the sources | |
356 | defined are transient, then | |
9155ea97 | 357 | .B fwd |
667fb920 | 358 | will quit when no more active sources remain and all connections have |
359 | terminated. | |
360 | .PP | |
361 | The | |
9155ea97 | 362 | .B fwd |
667fb920 | 363 | program is fairly versatile. It allows you to attach any supported type |
364 | of source to any supported type of target. This will, I hope, be the | |
365 | case in all future versions. | |
366 | .PP | |
367 | The syntax of a | |
368 | .I source | |
369 | or | |
370 | .I target | |
371 | depend on the source or target type, and are therefore described in the | |
372 | sections specific to the various types. | |
373 | . | |
374 | .SS "Options structure" | |
375 | Most of the objects that | |
9155ea97 | 376 | .B fwd |
667fb920 | 377 | knows about (including sources and targets, but also other more specific |
378 | things such as socket address types) can have their behaviour modified | |
379 | by | |
380 | .IR options . | |
381 | The options available at a particular point in the configuration depend | |
382 | on the | |
383 | .IR context . | |
384 | A global option, outside of a | |
9155ea97 | 385 | .I fwd-stmt |
667fb920 | 386 | has no context unless it is explicitly qualified, and affects global |
723210e6 | 387 | behaviour. A local option, applied to a source or target in a |
9155ea97 | 388 | .IR fwd-stmt , |
667fb920 | 389 | has the context of the type of source or target to which it is applied, |
390 | and affects only that source or target. | |
391 | .PP | |
392 | Note that it's important to distinguish between an option's context | |
393 | (which is affected by its qualification) and its local or global | |
394 | status. No matter how qualified, a global option will always control | |
395 | default options for objects, and a local option will only affect a | |
396 | specific source or target. | |
397 | .PP | |
398 | The syntax for qualifying options is like this: | |
333c51f4 | 399 | .GS "Option syntax" |
667fb920 | 400 | .I option-stmt |
401 | ::= | |
402 | .I q-option | |
403 | .br | |
404 | .I q-option | |
405 | ::= | |
406 | .I option | |
407 | .br | |
408 | | | |
409 | .I prefix | |
23be5eb0 | 410 | .B .\& |
667fb920 | 411 | .I q-option |
412 | .br | |
413 | | | |
414 | .I prefix | |
415 | .B { | |
416 | .I option-seq | |
417 | .B } | |
418 | .br | |
419 | .I prefix | |
420 | ::= | |
421 | .I word | |
333c51f4 | 422 | .GE |
667fb920 | 423 | Thus, you may qualify either an individual option or a sequence of |
424 | options. The two are equivalent; for example, | |
425 | .VS | |
426 | exec.rlimit { | |
427 | core = 0; | |
428 | cpu = 60; | |
429 | } | |
430 | .VE | |
723210e6 | 431 | means the same as |
667fb920 | 432 | .VS |
433 | exec.rlimit.core = 0; | |
434 | exec.rlimit.cpu = 0; | |
435 | .VE | |
436 | For each option, there is a sequence of prefixes which maximally qualify | |
437 | that option. An option prefixed with this sequence is | |
438 | .IR "fully qualified" . | |
439 | In actual use, some or all of those prefixes may be omitted. However, | |
440 | it's possible for the option to become | |
441 | .I ambiguous | |
442 | if you do this. For example, the option | |
443 | .B fattr.owner | |
444 | may refer either to | |
445 | .B file.fattr.owner | |
446 | or to | |
447 | .BR socket.unix.fattr.owner . | |
448 | In this case, the ambiguity is benign: a local option will have as its | |
449 | context an appropriate source or target, and both global options | |
450 | actually control the same default. However, the option | |
451 | .B logging | |
452 | may mean either | |
453 | .B socket.logging | |
454 | or | |
455 | .BR exec.logging , | |
456 | which have separate defaults, and which one you actually get depends on | |
457 | the exact implementation of | |
9155ea97 | 458 | .BR fwd 's |
667fb920 | 459 | option parser. (Currently this would resolve to |
460 | .BR exec.logging , | |
461 | although this may change in a later version.) | |
462 | .PP | |
463 | In this manual, options are usually shown in their fully-qualified form. | |
464 | . | |
333c51f4 | 465 | .SS "File attributes for created files: `fattr'" |
466 | Both the | |
467 | .B file | |
468 | and | |
469 | .B socket | |
470 | sources and targets can create new filesystem objects. The | |
471 | .B fattr | |
472 | options allow control over the attributes of the newly-created objects. | |
473 | Both | |
474 | .B file | |
475 | and | |
476 | .B socket | |
477 | use the same set of defaults, so a prefix of | |
478 | .B fattr | |
479 | is good enough for setting global options, and the implicit context | |
480 | disambiguates local options. | |
481 | .PP | |
482 | The following file attribute options are supported: | |
8cf7c7c2 | 483 | .OS "File attributes (`fattr')" |
333c51f4 | 484 | .IB prefix .fattr.mode |
485 | .RB [ = ] | |
486 | .I mode | |
487 | .OD | |
488 | Sets the permissions mode for a new file. The | |
489 | .I mode | |
490 | argument may be either an octal number or a | |
491 | .BR chmod (1)-style | |
492 | string which acts on the default permissions established by the | |
493 | prevailing | |
494 | .BR umask (2) | |
495 | setting. The characters | |
496 | .RB ` = ' | |
497 | and | |
498 | .RB ` , ' | |
499 | do not have to be quoted within the mode string. | |
500 | .OE | |
8cf7c7c2 | 501 | .OS "File attributes (`fattr')" |
333c51f4 | 502 | .IB prefix .fattr.owner |
503 | .RB [ = ] | |
504 | .I user | |
505 | .OD | |
506 | Sets the owner for newly created files. On non-broken systems you will | |
507 | need to be the superuser to set the owner on a file. The | |
508 | .I user | |
509 | may either be a numeric uid or a username. The default is not to change | |
510 | the owner of the file once it's created. The synonyms | |
511 | .B uid | |
512 | and | |
513 | .B user | |
514 | are accepted in place of | |
515 | .BR owner . | |
516 | .OE | |
8cf7c7c2 | 517 | .OS "File attributes (`fattr')" |
333c51f4 | 518 | .IB prefix .fattr.group |
519 | .RB [ = ] | |
520 | .I group | |
521 | .OD | |
522 | Sets the group for newly created files. You will usually need to be a | |
523 | member of the group in question order to set the group of a file. The | |
524 | .I group | |
525 | may either be a numeric gid or a group name. The default is not to | |
526 | change the group of the file once it's created. The synonym | |
527 | .B gid | |
528 | is accepted in place of | |
529 | .BR group . | |
530 | .OE | |
531 | . | |
667fb920 | 532 | .SS "The `file' source and target types" |
533 | The | |
534 | .B file | |
535 | source and target allow data to move to and from objects other | |
536 | than sockets within the Unix filesystem. (Unix-domain sockets are | |
537 | handled using the | |
538 | .B socket | |
539 | source and target.) | |
540 | .PP | |
541 | If a | |
542 | .B file | |
543 | is used as a source, it is set up immediately. | |
544 | .PP | |
545 | The syntax of | |
546 | .B file | |
547 | sources and targets is like this: | |
8cf7c7c2 | 548 | .GS "File source and target" |
667fb920 | 549 | .I source |
550 | ::= | |
551 | .I file | |
552 | .br | |
553 | .I target | |
554 | ::= | |
555 | .I file | |
556 | .br | |
557 | .I file | |
558 | ::= | |
559 | .B file | |
23be5eb0 | 560 | .RB [ .\& ] |
667fb920 | 561 | .I fspec |
562 | .RB [ , | |
563 | .IR fspec ] | |
564 | .br | |
565 | .I fspec | |
566 | ::= | |
567 | .I fd-spec | |
568 | | | |
569 | .I name-spec | |
570 | | | |
571 | .I null-spec | |
572 | .br | |
573 | .I fd-spec | |
574 | ::= | |
575 | .RB [[ : ] fd [ : ]] | |
576 | .IR number \c | |
577 | .RB | stdin | stdout | |
578 | .br | |
579 | .I name-spec | |
580 | ::= | |
b69a615b | 581 | .RB [[ : ] name [ : ]] |
667fb920 | 582 | .I file-name |
583 | .br | |
584 | .I file-name | |
585 | ::= | |
586 | .I path-seq | |
587 | | | |
588 | .B [ | |
589 | .I path-seq | |
590 | .B ] | |
591 | .br | |
592 | .I path-seq | |
593 | ::= | |
594 | .I path-elt | |
595 | | | |
596 | .I path-seq | |
597 | .I path-elt | |
598 | .br | |
599 | .I path-elt | |
600 | ::= | |
601 | .B / | |
602 | | | |
603 | .I word | |
604 | .br | |
605 | .I null-spec | |
606 | ::= | |
e73034b0 | 607 | .RB [ : ] null [ : ] |
333c51f4 | 608 | .GE |
667fb920 | 609 | The |
610 | .I file | |
611 | specification describes two files, the first to be used as input, the | |
612 | second to be used as output, each described by an | |
613 | .IR fspec . | |
614 | .PP | |
615 | If none of the keywords | |
616 | .RB ` fd ', | |
617 | .RB ` name ' | |
618 | or | |
619 | .RB ` null ' | |
620 | are given, the type of an | |
621 | .I fspec | |
622 | is deduced from its nature: if it matches one of the strings | |
623 | .RB ` stdin ' | |
624 | or | |
625 | .RB ` stdout ', | |
626 | or begins with a digit, it's considered to be a file descriptor; | |
627 | otherwise it's interpreted as a filename. | |
628 | .PP | |
629 | A | |
630 | .RB ` name ' | |
631 | spec describes a file by its name within the filesystem. It is opened | |
632 | when needed and closed again after use. For output files, the precise | |
633 | behaviour is controlled by options described below. | |
634 | .PP | |
635 | A | |
636 | .RB ` null ' | |
637 | spec attaches the input or output of the source or target to | |
638 | .BR /dev/null . | |
639 | .PP | |
640 | An | |
641 | .RB ` fd ' | |
642 | spec uses an existing open file descriptor, given either by number or a | |
643 | symbolic name. The name | |
644 | .RB ` stdin ' | |
645 | refers to standard input (file descriptor 0 on normal systems) and | |
646 | .RB ` stdout ' | |
647 | refers to standard output (file descriptor 1). The names work in | |
648 | exactly the same way as the equivalent file descriptor numbers. | |
649 | .PP | |
650 | If the output | |
651 | .I fspec | |
652 | is omitted, the input | |
653 | .I fspec | |
654 | is used for both input and output. Exception: if the input refers to | |
655 | standard input then the output will refer to standard output instead. | |
656 | .PP | |
657 | All | |
658 | .B file | |
659 | options apply equally to sources and targets. The options are as | |
660 | follows: | |
333c51f4 | 661 | .OS "File options" |
667fb920 | 662 | .B file.create |
663 | .RB [ = ] | |
664 | .BR yes | no | |
333c51f4 | 665 | .OD |
667fb920 | 666 | Whether to create the output file if it doesn't exist. If |
667 | .B no | |
668 | (the default), an error is reported if the file doesn't exist. If | |
669 | .BR yes , | |
670 | the file is created if it doesn't exist. | |
333c51f4 | 671 | .OE |
672 | .OS "File options" | |
667fb920 | 673 | .B file.open |
674 | .RB [ = ] | |
675 | .BR no | truncate | append | |
333c51f4 | 676 | .OD |
667fb920 | 677 | Controls the behaviour if the output file already exists. If |
678 | .BR no , | |
679 | an error is reported. If | |
206212ca | 680 | .B truncate |
667fb920 | 681 | (the default), the existing file is replaced by the new data. If |
682 | .BR append , | |
683 | the new data is appended to the file. | |
333c51f4 | 684 | .OE |
685 | .OS "File options" | |
8cf7c7c2 | 686 | .BR file.fattr. * |
333c51f4 | 687 | .OD |
667fb920 | 688 | The |
689 | .B file | |
690 | source and target also accept | |
691 | .B fattr | |
333c51f4 | 692 | options for controlling the attributes of the created file. |
693 | .OE | |
667fb920 | 694 | .PP |
333c51f4 | 695 | Under no circumstances will |
9155ea97 | 696 | .B fwd |
333c51f4 | 697 | create a file through a `dangling' symbolic link. |
667fb920 | 698 | . |
699 | .SS "The `exec' source and target types" | |
700 | The | |
701 | .B exec | |
702 | source and target execute programs and allow access to their standard | |
703 | input and output streams. Both source and target have the same syntax, | |
704 | which is as follows: | |
333c51f4 | 705 | .GS "Exec source and target" |
667fb920 | 706 | .I source |
707 | ::= | |
708 | .I exec | |
709 | .br | |
710 | .I target | |
711 | ::= | |
8cf7c7c2 | 712 | .I exec |
667fb920 | 713 | .br |
714 | .I exec | |
715 | ::= | |
716 | .BR exec | |
23be5eb0 | 717 | .RB [ .\& ] |
667fb920 | 718 | .I cmd-spec |
719 | .br | |
720 | .I cmd-spec | |
721 | ::= | |
722 | .I shell-cmd | |
10a454ad | 723 | | |
667fb920 | 724 | .RI [ prog-name ] |
725 | .B [ | |
726 | .I argv0 | |
727 | .I arg-seq | |
728 | .B ] | |
729 | .br | |
730 | .I arg-seq | |
731 | ::= | |
732 | .I word | |
733 | | | |
734 | .I arg-seq | |
735 | .I word | |
736 | .br | |
737 | .I shell-cmd | |
738 | ::= | |
739 | .I word | |
740 | .br | |
741 | .I argv0 | |
742 | ::= | |
743 | .I word | |
333c51f4 | 744 | .GE |
667fb920 | 745 | If a single word is given, it is a |
746 | .I shell-cmd | |
747 | and will be passed to the Bourne shell for execution. If a | |
748 | bracket-enclosed sequence of words is given, it is considered to be a | |
749 | list of arguments to pass to the program: if a | |
750 | .I prog-name | |
751 | is also supplied, it names the file containing the program to execute; | |
752 | otherwise the file named by the first argument | |
753 | .RI ( argv0 ) | |
754 | is used. | |
755 | .PP | |
49f5947b | 756 | Note that the shell command or program name string must, if present, |
757 | have any delimiter characters (including | |
758 | .RB ` / ' | |
206212ca | 759 | and |
49f5947b | 760 | .RB ` . ') |
761 | quoted; this is not required in the | |
762 | .RB ` [ '-enclosed | |
763 | argument list. | |
764 | .PP | |
667fb920 | 765 | The standard input and output of the program are forwarded to the other |
766 | end of the connection. The standard error stream is caught by | |
9155ea97 | 767 | .B fwd |
667fb920 | 768 | and logged. |
769 | .PP | |
770 | The | |
771 | .B exec | |
772 | source and target both understand the same set of options. The list of | |
773 | options supported is as follows: | |
333c51f4 | 774 | .OS "Exec options" |
667fb920 | 775 | .B exec.logging |
776 | .RB [ = ] | |
777 | .BR yes | no | |
333c51f4 | 778 | .OD |
667fb920 | 779 | Whether to log the start and end of executed programs. If |
780 | .B yes | |
781 | (the default), a log message is emitted when the program is started | |
782 | listing its process id, and another is emitted when the program finishes | |
783 | giving its process id and exit status. If | |
784 | .BR no , | |
785 | these messages are not emitted. However the standard error stream is | |
786 | still logged. The | |
787 | .B log | |
788 | abbreviation is accepted as a synonym for | |
789 | .BR logging . | |
333c51f4 | 790 | .OE |
791 | .OS "Exec options" | |
667fb920 | 792 | .B exec.dir |
793 | .RB [ = ] | |
794 | .I file-name | |
333c51f4 | 795 | .OD |
667fb920 | 796 | Sets the current directory from which the the program should be run. |
797 | The default is not to change directory. The synonyms | |
798 | .BR cd , | |
799 | .B chdir | |
800 | and | |
801 | .B cwd | |
802 | are accepted in place of | |
803 | .BR dir . | |
333c51f4 | 804 | .OE |
805 | .OS "Exec options" | |
667fb920 | 806 | .B exec.root |
807 | .RB [ = ] | |
808 | .I file-name | |
333c51f4 | 809 | .OD |
667fb920 | 810 | Sets the root directory for the program, using the |
811 | .BR chroot (2) | |
812 | system call. You must be the superuser for this option to work. The | |
372a98e2 | 813 | default is not to set a root directory. The synonym |
814 | .B chroot | |
815 | is accepted in place of | |
816 | .BR root . | |
333c51f4 | 817 | .OE |
818 | .OS "Exec options" | |
667fb920 | 819 | .B exec.user |
820 | .RB [ = ] | |
821 | .I user | |
333c51f4 | 822 | .OD |
667fb920 | 823 | Sets the user (real and effective uid) to run the program as. This will |
824 | usually require superuser privileges to work. The default is not to | |
825 | change uid. The synonym | |
826 | .B uid | |
827 | is accepted in place of | |
828 | .BR user . | |
333c51f4 | 829 | .OE |
830 | .OS "Exec options" | |
667fb920 | 831 | .B exec.group |
832 | .RB [ = ] | |
833 | .I group | |
333c51f4 | 834 | .OD |
667fb920 | 835 | Sets the group (real and effective gid) to run the program as. If |
836 | running with superuser privileges, the supplementary groups list is | |
837 | cleared at the same time. The default is not to change gid (or clear | |
838 | the supplementary groups list). The synonym | |
839 | .B gid | |
840 | is accepted in place of | |
841 | .BR group . | |
333c51f4 | 842 | .OE |
843 | .OS "Exec options" | |
667fb920 | 844 | .BI exec.rlimit. limit \c |
845 | .RB [ .hard | .soft ] | |
846 | .RB [ = ] | |
847 | .I value | |
333c51f4 | 848 | .OD |
667fb920 | 849 | Set resource limits for the program. The |
850 | .I limit | |
851 | may be one of the resource limit names described in | |
852 | .BR setrlimit (2), | |
853 | in lower-case and without the | |
854 | .B RLIMIT_ | |
855 | prefix; for example, | |
856 | .B RLIMIT_CORE | |
857 | becomes simply | |
858 | .BR core . | |
859 | The | |
860 | .I value | |
861 | is a number, followed optionally by | |
862 | .B k | |
863 | to multiply by 1024 (2\*(ss10\*(se), | |
864 | .B m | |
865 | to multiply by 1048576 (2\*(ss20\*(se), or | |
866 | .B g | |
867 | to multiply by 1073741824 (2\*(ss30\*(se); purists can use upper-case | |
868 | versions of these if they want. If | |
869 | .B .hard | |
870 | or | |
871 | .B .soft | |
872 | was specified, only the hard or soft limit is set; otherwise both are | |
873 | set to the same value. Only the superuser can raise the hard limit. | |
874 | The soft limit cannot be set above the hard limit. | |
333c51f4 | 875 | .OE |
876 | .OS "Exec options" | |
667fb920 | 877 | .B exec.env.clear |
333c51f4 | 878 | .OD |
667fb920 | 879 | Clears the program's environment. |
333c51f4 | 880 | .OE |
8cf7c7c2 | 881 | .OS "Exec options" |
667fb920 | 882 | .B exec.env.unset |
883 | .I var | |
333c51f4 | 884 | .OD |
667fb920 | 885 | Removes |
886 | .I var | |
887 | from the program's environment. It is not an error if no variable named | |
888 | .I var | |
889 | exists. | |
333c51f4 | 890 | .OE |
891 | .OS "Exec options" | |
667fb920 | 892 | .BR exec.env. [ set ] |
893 | .I var | |
894 | .RB [ = ] | |
895 | .I value | |
333c51f4 | 896 | .OD |
96bc31ba | 897 | Assigns the variable |
667fb920 | 898 | .I var |
899 | the value | |
900 | .I value | |
901 | in the program's environment, possibly replacing the existing value. | |
902 | The | |
903 | .B set | |
904 | may be omitted if the | |
905 | .B env | |
906 | qualifier is present. | |
333c51f4 | 907 | .OE |
667fb920 | 908 | .PP |
909 | Note that environment variable modifications are performed in order, | |
910 | global modifications before local ones. | |
911 | . | |
912 | .SS "The `socket' source and target types" | |
913 | The | |
914 | .B socket | |
915 | source and target provide access to network services. Support is | |
916 | currently provided for TCP/IP and Unix-domain sockets, although other | |
917 | address types can be added with reasonable ease. | |
918 | .PP | |
919 | The syntax for socket sources and targets is: | |
333c51f4 | 920 | .GS "Socket source and target" |
667fb920 | 921 | .ll +8i |
922 | .I source | |
923 | ::= | |
924 | .I socket-source | |
10a454ad | 925 | .br |
667fb920 | 926 | .I target |
927 | ::= | |
928 | .I socket-target | |
929 | .br | |
930 | .I socket-source | |
931 | ::= | |
23be5eb0 | 932 | .RB [ socket [ .\& ]] |
667fb920 | 933 | .RB [[ : ] \c |
934 | .IR addr-type \c | |
935 | .RB [ : ]] | |
936 | .I source-addr | |
937 | .br | |
938 | .I socket-target | |
939 | ::= | |
23be5eb0 | 940 | .RB [ socket [ .\& ]] |
667fb920 | 941 | .RB [[ : ] \c |
942 | .IR addr-type \c | |
943 | .RB [ : ]] | |
944 | .I target-addr | |
945 | .ll -8i | |
333c51f4 | 946 | .GE |
667fb920 | 947 | The syntax of the source and target addresses depend on the address |
948 | types, which are described below. The default address type, if no | |
949 | .I addr-type | |
950 | is given, is | |
951 | .BR inet . | |
952 | .PP | |
953 | Socket sources support options; socket targets do not. The source | |
954 | options provided are: | |
333c51f4 | 955 | .OS "Socket options" |
64c6a214 MW |
956 | .BR socket. [ accept | accept-count ] |
957 | .RB [ = ] | |
958 | .IR number | \c | |
959 | .B unlimited | |
960 | .OD | |
961 | Controls the number of connections that | |
962 | .B fw | |
963 | accepts at a time on a particular socket. This parameter affects how | |
964 | .B fw | |
965 | prioritizes between keeping up with connection turnover and processing | |
966 | existing connections. The default is 1, which strongly favours existing | |
967 | connections. The special value | |
968 | .B unlimited | |
969 | (or | |
970 | .BR infinite ) | |
971 | removes any limit, and therefore favours connection turnover. | |
972 | .OE | |
973 | .OS "Socket options" | |
667fb920 | 974 | .B socket.conn |
975 | .RB [ = ] | |
d857515e | 976 | .IR number | \c |
977 | .BR unlimited | one-shot | |
333c51f4 | 978 | .OD |
d857515e | 979 | Controls the behaviour of the source when it receives connections. A |
667fb920 | 980 | .I number |
d857515e | 981 | limits the number of simultaneous connections. The value |
982 | .B unlimited | |
983 | (or | |
984 | .BR infinite ) | |
985 | removes any limit on the number of connections possible. The value | |
986 | .B one-shot | |
987 | will remove the socket source after a single successful connection. | |
988 | (Connections refused by access control systems don't count here.) | |
989 | The default is to apply a limit of 256 concurrent connections. Use of | |
990 | the | |
991 | .B unlimited | |
992 | option is not recommended. | |
333c51f4 | 993 | .OE |
994 | .OS "Socket options" | |
6f427571 | 995 | .B socket.listen |
996 | .RB [ = ] | |
997 | .I number | |
998 | .OD | |
999 | Sets the maximum of the kernel incoming connection queue for this socket | |
1000 | source. This is the number given to the | |
1001 | .BR listen (2) | |
1002 | system call. The default is 5. | |
1003 | .OE | |
1004 | .OS "Socket options" | |
667fb920 | 1005 | .B socket.logging |
1006 | .RB [ = ] | |
1007 | .BR yes | no | |
333c51f4 | 1008 | .OD |
206212ca | 1009 | Whether to log incoming connections. If |
667fb920 | 1010 | .B yes |
1011 | (the default) incoming connections are logged, together with information | |
1012 | about the client (where available) and whether the connection was | |
1013 | accepted or refused. If | |
1014 | .BR no , | |
1015 | log messages are not generated. | |
333c51f4 | 1016 | .OE |
667fb920 | 1017 | .PP |
1018 | Address types also provide their own options. | |
1019 | . | |
1020 | .SS "The `inet' socket address type" | |
8cf7c7c2 MW |
1021 | .GL "Socket source and target" |
1022 | .OL "Socket options" | |
667fb920 | 1023 | The |
1024 | .B inet | |
1025 | address type provides access to TCP ports. The | |
1026 | .B inet | |
1027 | source and target addresses have the following syntax: | |
333c51f4 | 1028 | .GS "Socket source and target" |
667fb920 | 1029 | .I inet-source-addr |
10a454ad | 1030 | ::= |
10a454ad | 1031 | .RB [ port ] |
1032 | .I port | |
667fb920 | 1033 | .br |
1034 | .I inet-target-addr | |
1035 | ::= | |
1036 | .I address | |
10a454ad | 1037 | .RB [ : ] |
1038 | .I port | |
10a454ad | 1039 | .br |
667fb920 | 1040 | .I address |
10a454ad | 1041 | ::= |
667fb920 | 1042 | .I addr-elt |
1043 | | | |
1044 | .I address | |
1045 | .I addr-elt | |
10a454ad | 1046 | .br |
667fb920 | 1047 | .I addr-elt |
10a454ad | 1048 | ::= |
23be5eb0 | 1049 | .B .\& |
10a454ad | 1050 | | |
667fb920 | 1051 | .I word |
333c51f4 | 1052 | .GE |
667fb920 | 1053 | A |
1054 | .I port | |
1055 | may be given as a port number or a service name from the | |
1056 | .B /etc/services | |
1057 | file (or YP map if you do that sort of thing). A | |
1058 | .B hostname | |
1059 | may be a textual hostname or a numerical IP address. | |
1060 | .PP | |
1061 | The | |
1062 | .B inet | |
1063 | source address accepts the following options: | |
333c51f4 | 1064 | .OS "Socket options" |
1c2054c7 | 1065 | .B socket.inet.source.addr |
1066 | .RB [ = ] | |
8cf7c7c2 | 1067 | .BR any | \c |
1c2054c7 | 1068 | .I addr |
1069 | .OD | |
1070 | Specify the IP address on which to listen for incoming connections. The | |
1071 | default is | |
1072 | .BR any , | |
1073 | which means to listen on all addresses, though it may be useful to | |
1074 | specify this explicitly, if the global setting is different. | |
1075 | .OE | |
1076 | .OS "Socket options" | |
1077 | .BR socket.inet.source. [ allow | deny ] | |
1078 | .RB [ host ] | |
1079 | .I addr | |
10a454ad | 1080 | .RB [ / |
1c2054c7 | 1081 | .IR addr ] |
333c51f4 | 1082 | .OD |
667fb920 | 1083 | Adds an entry to the source's access control list. If only one |
1084 | .I address | |
1085 | is given, the entry applies only to that address; if two are given, the | |
1086 | first is a network address and the second is a netmask either in | |
1087 | dotted-quad format or a simple number of bits (e.g., | |
1088 | .B /255.255.255.192 | |
1089 | and | |
1090 | .B /26 | |
1091 | mean the same), and the entry applies to any address which, when masked | |
1092 | by the netmask, is equal to the masked network address. | |
333c51f4 | 1093 | .OE |
1c2054c7 | 1094 | .OS "Socket options" |
1095 | .BR socket.inet.source. [ allow | deny ] | |
1096 | .B priv-port | |
1097 | .OD | |
1098 | Accept or reject connections from low-numbered `privileged' ports, in | |
1099 | the range 0--1023. | |
1100 | .OE | |
1101 | .OS "Socket options" | |
1102 | .B socket.inet.dest.addr | |
1103 | .RB [ = ] | |
8cf7c7c2 | 1104 | .BR any | \c |
1c2054c7 | 1105 | .I addr |
1106 | .OD | |
1107 | Specify the IP address to bind the local socket to when making an | |
1108 | outbound connection. The default is | |
1109 | .BR any , | |
1110 | which means to use whichever address the kernel thinks is most | |
1111 | convenient. This option is useful if the destination is doing | |
1112 | host-based access control and your server is multi-homed. | |
1113 | .OE | |
ee599f55 | 1114 | .OS "Socket options" |
1115 | .B socket.inet.dest.priv-port | |
1116 | .RB [=] | |
1117 | .BR yes | no | |
1118 | .OD | |
1119 | Make a privileged connection (i.e., from a low-numbered port) to the | |
1120 | target. This only works if | |
9155ea97 | 1121 | .B fwd |
ee599f55 | 1122 | was started with root privileges. However, it still works if |
9155ea97 | 1123 | .B fwd |
ee599f55 | 1124 | has |
1125 | .I dropped | |
1126 | privileges after initialization (the | |
1127 | .B \-s | |
206212ca | 1128 | option). Before dropping privileges, |
9155ea97 | 1129 | .B fwd |
ee599f55 | 1130 | forks off a separate process which continues to run with root |
1131 | privileges, and on demand passes sockets bound to privileged ports and | |
1132 | connected to the appropriate peer back to the main program. The | |
1133 | privileged child only passes back sockets connected to peer addresses | |
1134 | named in the configuration; even if the | |
9155ea97 | 1135 | .B fwd |
ee599f55 | 1136 | process is compromised, it can't make privileged connections to other |
1137 | addresses. Note that because of this privilege separation, it's also | |
1138 | not possible to reconfigure | |
9155ea97 | 1139 | .B fwd |
69c8e834 | 1140 | to make privileged connections to different peer addresses later by |
ee599f55 | 1141 | changing configuration files and sending the daemon a |
1142 | .BR SIGHUP . | |
1143 | .OE | |
10a454ad | 1144 | .PP |
333c51f4 | 1145 | The access control rules are examined in the order: local entries first, |
1146 | then global ones, each in the order given in the configuration file. | |
1147 | The first matching entry is used. If no entries match, the behaviour is | |
1148 | the | |
667fb920 | 1149 | .I opposite |
1150 | of the last entry tried. If there are no entries defined, the default | |
1151 | is to allow all clients. | |
667fb920 | 1152 | . |
1153 | .SS "The `unix' socket address type" | |
8cf7c7c2 MW |
1154 | .GL "Socket source and target" |
1155 | .OL "Socket options" | |
10a454ad | 1156 | The |
667fb920 | 1157 | .B unix |
1158 | address type allows access to Unix-domain sockets. The syntax for | |
1159 | .B unix | |
1160 | source and target addresses is like this: | |
333c51f4 | 1161 | .GS "Socket source and target" |
1162 | .I unix-source-addr | |
667fb920 | 1163 | ::= |
333c51f4 | 1164 | .I file-name |
667fb920 | 1165 | .br |
333c51f4 | 1166 | .I unix-target-addr |
667fb920 | 1167 | ::= |
1168 | .I file-name | |
333c51f4 | 1169 | .GE |
1170 | The following options are supported by the | |
1171 | .B unix | |
1172 | source address type: | |
1173 | .OS "Socket options" | |
1174 | .BR socket.unix.fattr. * | |
1175 | .OD | |
667fb920 | 1176 | The |
1177 | .B unix | |
1178 | source address accepts | |
1179 | .B fattr | |
333c51f4 | 1180 | options to control the attributes of the socket file created. |
1181 | .OE | |
1182 | .PP | |
1183 | Sockets are removed if | |
9155ea97 | 1184 | .B fwd |
667fb920 | 1185 | exits normally (which it will do if it runs out of sources or |
372a98e2 | 1186 | connections, or if |
9155ea97 | 1187 | .B fwd |
372a98e2 | 1188 | shuts down in a clean way). |
667fb920 | 1189 | .SH "EXAMPLES" |
1190 | To forward the local port 25 to a main mail server: | |
1191 | .VS | |
1192 | from 25 to mailserv:25 | |
1193 | .VE | |
1194 | To attach a fortune server to a Unix-domain socket: | |
1195 | .VS | |
1196 | from unix:/tmp/fortunes | |
1197 | to exec [/usr/games/fortune] { user nobody } | |
1198 | .VE | |
1199 | To fetch a fortune from the server: | |
1200 | .VS | |
1201 | from file stdin, stdout to unix:/tmp/fortunes | |
1202 | .VE | |
1203 | To emulate | |
1204 | .BR cat (1): | |
1205 | .VS | |
49f5947b | 1206 | from file stdin, null to file null, stdout |
667fb920 | 1207 | .VE |
69c8e834 | 1208 | .sp -1 \" undo final space |
667fb920 | 1209 | . |
1210 | .\"-------------------------------------------------------------------------- | |
372a98e2 | 1211 | .SH "SIGNAL HANDLING" |
1212 | . | |
1213 | The | |
9155ea97 | 1214 | .B fwd |
372a98e2 | 1215 | program responds to various signals when it's running. If it receives |
1216 | .B SIGTERM | |
1217 | or | |
1218 | .BR SIGINT , | |
9155ea97 | 1219 | .B fwd |
372a98e2 | 1220 | performs a |
1221 | .I graceful | |
1222 | shutdown: it removes all of its sources, and will exit when no more | |
1223 | connections are running. (Note that if the disposition | |
1224 | .B SIGINT | |
1225 | was to ignore it, | |
9155ea97 | 1226 | .B fwd |
372a98e2 | 1227 | does not re-enable the signal. You'll have to send |
1228 | .B SIGTERM | |
1229 | in that case.) If | |
9155ea97 | 1230 | .B fwd |
372a98e2 | 1231 | receives |
1232 | .BR SIGQUIT , | |
1233 | it performs an | |
1234 | .I abrupt | |
1235 | shutdown: it removes all sources and extant connections and closes down | |
1236 | more-or-less immediately. | |
1237 | .PP | |
1238 | Finally, if any configuration files (other than standard input) were | |
1239 | provided to | |
9155ea97 | 1240 | .B fwd |
372a98e2 | 1241 | on its command line using the |
1242 | .B \-f | |
1243 | option, a | |
1244 | .B SIGHUP | |
1245 | signal may be sent to instruct | |
9155ea97 | 1246 | .B fwd |
372a98e2 | 1247 | to reload its configuration. Any existing connections are allowed to |
1248 | run their course. If no such configuration files are available, | |
9155ea97 | 1249 | .B fwd |
372a98e2 | 1250 | just logs a message about the signal and continues. |
372a98e2 | 1251 | . |
1252 | .\"-------------------------------------------------------------------------- | |
333c51f4 | 1253 | .SH "GRAMMAR SUMMARY" |
1254 | . | |
8cf7c7c2 | 1255 | @@@ grammar |
333c51f4 | 1256 | .\"-------------------------------------------------------------------------- |
1257 | .SH "OPTION SUMMARY" | |
1258 | . | |
8cf7c7c2 | 1259 | @@@ option |
333c51f4 | 1260 | .\"-------------------------------------------------------------------------- |
10a454ad | 1261 | .SH "BUGS" |
667fb920 | 1262 | . |
35a142ca MW |
1263 | The syntax for IP addresses and filenames is nasty. (The filename |
1264 | syntax used to be even nastier, though.) | |
10a454ad | 1265 | .PP |
d857515e | 1266 | IPv6 is not supported yet. Because of |
9155ea97 | 1267 | .BR fwd 's |
d857515e | 1268 | socket address architecture, it's probably not a major piece of work to |
667fb920 | 1269 | add. |
10a454ad | 1270 | .PP |
667fb920 | 1271 | Please inform me of any security problems you think you've identified in |
1272 | this program. I take security very seriously, and I will fix security | |
1273 | holes as a matter of priority when I find out about them. I will be | |
1274 | annoyed if I have to read about problems on Bugtraq because they weren't | |
1275 | mailed to me first. | |
723210e6 | 1276 | .PP |
1277 | The program is too complicated, and this manual page is too long. | |
667fb920 | 1278 | . |
1279 | .\"-------------------------------------------------------------------------- | |
10a454ad | 1280 | .SH "AUTHOR" |
667fb920 | 1281 | . |
f65809f7 | 1282 | Mark Wooding, <mdw@distorted.org.uk> |
667fb920 | 1283 | . |
1284 | .\"----- That's all, folks -------------------------------------------------- |