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1 .\" Copyright (c) 2021, 2022 Omar Polo <op@omarpolo.com>
2 .\"
3 .\" Permission to use, copy, modify, and distribute this software for any
4 .\" purpose with or without fee is hereby granted, provided that the above
5 .\" copyright notice and this permission notice appear in all copies.
6 .\"
7 .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
10 .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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12 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
13 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
14 .Dd $Mdocdate: January 30 2022$
15 .Dt GMID 1
16 .Os
17 .Sh NAME
18 .Nm gmid
19 .Nd simple and secure Gemini server
20 .Sh SYNOPSIS
21 .Nm
22 .Bk -words
23 .Op Fl fnv
24 .Op Fl c Ar config
25 .Op Fl D Ar macro Ns = Ns Ar value
26 .Op Fl P Ar pidfile
27 .Ek
28 .Nm
29 .Bk -words
30 .Op Fl 6hVv
31 .Op Fl d Ar certs-dir
32 .Op Fl H Ar hostname
33 .Op Fl p Ar port
34 .Op Fl x Ar cgi
35 .Op Ar dir
36 .Ek
37 .Sh DESCRIPTION
38 .Nm
39 is a simple and minimal gemini server that can serve static files,
40 execute CGI scripts and talk to FastCGI applications.
41 It can run without a configuration file with a limited set of features
42 available.
43 .Pp
44 .Nm
45 rereads the configuration file when it receives
46 .Dv SIGHUP .
47 .Pp
48 The options are as follows:
49 .Bl -tag -width 14m
50 .It Fl c Ar config
51 Specify the configuration file.
52 .It Fl D Ar macro Ns = Ns Ar value
53 Define
54 .Ar macro
55 to be set to
56 .Ar value
57 on the command line.
58 Overrides the definition of
59 .Ar macro
60 in the config file if present.
61 .It Fl f
62 Stays and logs on the foreground.
63 .It Fl n
64 Check that the configuration is valid, but don't start the server.
65 If specified two or more time, dump the configuration in addition to
66 verify it.
67 .It Fl P Ar pidfile
68 Write daemon's pid to the given location.
69 .Ar pidfile
70 will also act as lock: if another process is holding a lock on that
71 file,
72 .Nm
73 will refuse to start.
74 .El
75 .Pp
76 If no configuration file is given,
77 .Nm
78 runs in
79 .Dq config-less mode
80 .Pq i.e. runs in the foreground to serve a directory from the shell
81 and looks for the following options
82 .Bl -tag -width 14m
83 .It Fl 6
84 Enable IPv6.
85 .It Fl d Ar certs-path
86 Directory where certificates for the config-less mode are stored.
87 By default it is
88 .Pa $XDG_DATA_HOME/gmid ,
89 i.e.
90 .Pa ~/.local/share/gmid .
91 .It Fl H Ar hostname
92 The hostname
93 .Po
94 .Ar localhost
95 by default
96 .Pc .
97 Certificates for the given
98 .Ar hostname
99 are searched inside the
100 .Ar certs-dir
101 directory given with the
102 .Fl d
103 option.
104 They have the form
105 .Pa hostname.cert.pem
106 and
107 .Pa hostname.key.pem .
108 If a certificate or a key doesn't exist for a given hostname, they
109 will be generated automatically.
110 .It Fl h , Fl -help
111 Print the usage and exit.
112 .It Fl p Ar port
113 The port to listen on, by default 1965.
114 .It Fl V , Fl -version
115 Print the version and exit.
116 .It Fl v
117 Verbose mode.
118 Multiple
119 .Fl v
120 options increase the verbosity.
121 .It Fl x Ar path
122 Enable execution of
123 .Sx CGI
124 scripts.
125 See the description of the
126 .Ic cgi
127 option in the
128 .Sq Servers
129 section below to learn how
130 .Ar path
131 is processed.
132 Cannot be provided more than once.
133 .It Ar dir
134 The root directory to serve.
135 By default the current working directory is assumed.
136 .El
137 .Sh CONFIGURATION FILE
138 The configuration file is divided into three sections:
139 .Bl -tag -width xxxx
140 .It Sy Macros
141 User-defined variables may be defined and used later, simplifying the
142 configuration file.
143 .It Sy Global Options
144 Global settings for
145 .Nm .
146 .It Sy Servers
147 Virtual hosts definition.
148 .El
149 .Pp
150 Within the sections, empty lines are ignored and comments can be put
151 anywhere in the file using a hash mark
152 .Pq Sq # ,
153 and extend to the end of the current line.
154 A boolean is either the symbol
155 .Sq on
156 or
157 .Sq off .
158 A string is a sequence of characters wrapped in double quotes,
159 .Dq like this .
160 Multiple strings one next to the other are joined into a single
161 string:
162 .Bd -literal -offset indent
163 # equivalent to "temporary-failure"
164 block return 40 "temporary" "-" "failure"
165 .Ed
166 .Pp
167 Furthermore, quoting is necessary only when a string needs to contain
168 special characters
169 .Pq like spaces or punctuation ,
170 something that looks like a number or a reserved keyword.
171 The last example could have been written also as:
172 .Bd -literal -offset indent
173 block return 40 temporary "-" failure
174 .Ed
175 .Pp
176 Strict ordering of the sections is not enforced, so that is possible
177 to mix macros, options and
178 .Ic server
179 blocks.
180 However, defining all the
181 .Ic server
182 blocks after the macros and the global options is recommended.
183 .Pp
184 Newlines are often optional, except around top-level instructions, and
185 semicolons
186 .Dq \&;
187 can also be optionally used to separate options.
188 .Pp
189 Additional configuration files can be included with the
190 .Ic include
191 keyword, for example:
192 .Bd -literal -offset indent
193 include "/etc/gmid.conf.local"
194 .Ed
195 .Ss Macros
196 Macros can be defined that will later be expanded in context.
197 Macro names must start with a letter, digit or underscore and may
198 contain any of those characters.
199 Macros names may not be reserved words.
200 Macros are not expanded inside quotes.
201 .Pp
202 Two kinds of macros are supported: variable-like and proper macros.
203 When a macro is invoked with a
204 .Dq $
205 before its name its expanded as a string, whereas when it's invoked
206 with a
207 .Dq @
208 its expanded in-place.
209 .Pp
210 For example:
211 .Bd -literal -offset indent
212 dir = "/var/gemini"
213 certdir = "/etc/keys"
214 common = "lang it; auto index on"
216 server "foo" {
217 root $dir "/foo" # -> /var/gemini/foo
218 cert $certdir "/foo.crt" # -> /etc/keys/foo.crt
219 key $certdir "/foo.pem" # -> /etc/keys/foo.pem
220 @common
222 .Ed
223 .Ss Global Options
224 .Bl -tag -width 12m
225 .It Ic chroot Ar path
226 .Xr chroot 2
227 the process to the given
228 .Ar path .
229 The daemon has to be run with root privileges and thus the option
230 .Ic user
231 needs to be provided, so privileges can be dropped.
232 Note that
233 .Nm
234 will enter the chroot after loading the TLS keys, but before opening
235 the virtual host root directories.
236 It's recommended to keep the TLS keys outside the chroot.
237 Future version of
238 .Nm
239 may enforce this.
240 .It Ic ipv6 Ar bool
241 Enable or disable IPv6 support, off by default.
242 .It Ic map Ar mime-type Cm to-ext Ar file-extension
243 Map
244 .Ar mime-type
245 to the given
246 .Ar file-extension .
247 Both argument are strings.
248 .It Ic port Ar portno
249 The port to listen on.
250 1965 by default.
251 .It Ic prefork Ar number
252 Run the specified number of server processes.
253 This increases the performance and prevents delays when connecting to
254 a server.
255 When not in config-less mode,
256 .Nm
257 runs 3 server processes by default.
258 The maximum number allowed is 16.
259 .It Ic protocols Ar string
260 Specify the TLS protocols to enable.
261 Refer to
262 .Xr tls_config_parse_protocols 3
263 for the valid protocol string values.
264 By default, both TLSv1.3 and TLSv1.2 are enabled.
265 Use
266 .Dq tlsv1.3
267 to enable only TLSv1.3.
268 .It Ic user Ar string
269 Run the daemon as the given user.
270 .El
271 .Ss Servers
272 Every virtual host is defined by a
273 .Ic server
274 block:
275 .Bl -tag -width Ds
276 .It Ic server Ar hostname Brq ...
277 Match the server name using shell globbing rules.
278 It can be an explicit name,
279 .Ar www.example.com ,
280 or a name including a wildcards,
281 .Ar *.example.com .
282 .El
283 .Pp
284 Followed by a block of options that is enclosed in curly brackets:
285 .Bl -tag -width Ds
286 .It Ic alias Ar name
287 Specify an additional alias
288 .Ar name
289 for this server.
290 .It Ic auto Ic index Ar bool
291 If no index file is found, automatically generate a directory listing.
292 Disabled by default.
293 .It Ic block Op Ic return Ar code Op Ar meta
294 Send a reply and close the connection;
295 by default
296 .Ar code
297 is 40
298 and
299 .Ar meta
300 is
301 .Dq temporary failure .
302 If
303 .Ar code
304 is in the 3x range, then
305 .Ar meta
306 is mandatory.
307 Inside
308 .Ar meta ,
309 the following special sequences are supported:
310 .Bl -tag -width Ds -compact
311 .It \&%\&%
312 is replaced with a single
313 .Sq \&% .
314 .It \&%p
315 is replaced with the request path.
316 .It \&%q
317 is replaced with the query string of the request.
318 .It \&%P
319 is replaced with the server port.
320 .It \&%N
321 is replaced with the server name.
322 .El
323 .It Ic cert Ar file
324 Path to the certificate to use for this server.
325 .Ar file
326 should contain a PEM encoded certificate.
327 This option is mandatory.
328 .It Ic cgi Ar path
329 Execute
330 .Sx CGI
331 scripts that matches
332 .Ar path
333 using shell globbing rules.
334 .It Ic default type Ar string
335 Set the default media type that is used if the media type for a
336 specified extension is not found.
337 If not specified, the
338 .Ic default type
339 is set to
340 .Dq application/octet-stream .
341 .It Ic entrypoint Ar path
342 Handle all the requests for the current virtual host using the
343 .Sx CGI
344 script at
345 .Ar path ,
346 relative to the current document root.
347 .It Ic env Ar name Cm = Ar value
348 Set the environment variable
349 .Ar name
350 to
351 .Ar value
352 when executing CGI scripts.
353 Can be provided more than once.
354 .\" don't document the "spawn <prog>" form because it probably won't
355 .\" be kept.
356 .It Ic fastcgi Oo Ic tcp Oc Ar socket Oo Cm port Ar port Oc
357 Enable
358 .Sx FastCGI
359 instead of serving files.
360 The
361 .Ar socket
362 can either be a UNIX-domain socket or a TCP socket.
363 If the FastCGI application is listening on a UNIX domain socket,
364 .Ar socket
365 is a local path name within the
366 .Xr chroot 2
367 root directory of
368 .Nm .
369 Otherwise, the
370 .Ic tcp
371 keyword must be provided and
372 .Ar socket
373 is interpreted as a hostname or an IP address.
374 .Ar port
375 can be either a port number or the name of a service enclosed in
376 double quotes.
377 If not specified defaults to 9000.
378 .It Ic index Ar string
379 Set the directory index file.
380 If not specified, it defaults to
381 .Pa index.gmi .
382 .It Ic key Ar file
383 Specify the private key to use for this server.
384 .Ar file
385 should contain a PEM encoded private key.
386 This option is mandatory.
387 .It Ic lang Ar string
388 Specify the language tag for the text/gemini content served.
389 If not specified, no
390 .Dq lang
391 parameter will be added in the response.
392 .It Ic location Ar path Brq ...
393 Specify server configuration rules for a specific location.
394 .Ar path
395 argument will be matched against the request path with shell globbing
396 rules.
397 In case of multiple location statements in the same context, the first
398 matching location will be put into effect and the later ones ignored.
399 Therefore is advisable to match for more specific paths first and for
400 generic ones later on.
402 .Ic location
403 section may include most of the server configuration rules
404 except
405 .Ic alias , Ic cert , Ic cgi , Ic entrypoint , Ic env , Ic key ,
406 .Ic location , Ic param No and Ic proxy .
407 .It Ic log Ar bool
408 Enable or disable the logging for the current server or location block.
409 .It Ic param Ar name Cm = Ar value
410 Set the param
411 .Ar name
412 to
413 .Ar value
414 for FastCGI.
415 .It Ic ocsp Ar file
416 Specify an OCSP response to be stapled during TLS handshakes
417 with this server.
418 The
419 .Ar file
420 should contain a DER-format OCSP response retrieved from an
421 OCSP server for the
422 .Ic cert
423 in use.
424 If the OCSP response in
425 .Ar file
426 is empty, OCSP stapling will not be used.
427 The default is to not use OCSP stapling.
428 .It Ic proxy Oo Cm proto Ar name Oc Oo Cm for-host Ar host : Ns Oo Ar port Oc Oc Brq ...
429 Set up a reverse proxy.
430 The optional matching rules
431 .Cm proto
432 and
433 .Cm for-host
434 can be used to enable proxying only for protocols matching
435 .Ar name
436 .Po Dq gemini
437 by default
438 .Pc
439 and/or whose request IRI matches
440 .Ar host
441 and
442 .Ar port
443 .Pq 1965 by default .
444 Matching happens using shell globbing rules.
445 .Pp
446 In case of multiple matching proxy blocks in the same context, the
447 first matching proxy will be put into effect and the later ones
448 ignored.
449 .Pp
450 Valid options are:
451 .Bl -tag -width Ds
452 .It Ic cert Ar file
453 Specify the client certificate to use when making requests.
454 .It Ic key Ar file
455 Specify the client certificate key to use when making requests.
456 .It Ic protocols Ar string
457 Specify the TLS protocols allowed when making remote requests.
458 Refer to the
459 .Xr tls_config_parse_protocols 3
460 function for the valid protocol string values.
461 By default, both TLSv1.2 and TLSv1.3 are enabled.
462 .It Ic relay-to Ar host : Ns Op Ar port
463 Relay the request to the given
464 .Ar host
465 at the given
466 .Ar port ,
467 1965 by default.
468 This is the only mandatory option in a
469 .Ic proxy
470 block.
471 .It Ic require Ic client Ic ca Ar file
472 Allow the proxying only from clients that provide a certificate
473 signed by the CA certificate in
474 .Ar file .
475 .It Ic sni Ar hostname
476 Use the given
477 .Ar hostname
478 instead of the one extracted from the
479 .Ic relay-to
480 rule for the TLS handshake with the proxied gemini server.
481 .It Ic use-tls Ar bool
482 Specify whether to use TLS when connecting to the proxied host.
483 Enabled by default.
484 .It Ic verifyname Ar bool
485 Enable or disable the TLS server name verification.
486 Enabled by default.
487 .El
488 .It Ic root Ar directory
489 Specify the root directory for this server
490 .Pq alas the current Dq document root .
491 It's relative to the chroot if enabled.
492 .It Ic require Ic client Ic ca Ar path
493 Allow requests only from clients that provide a certificate signed by
494 the CA certificate in
495 .Ar path .
496 It needs to be a PEM-encoded certificate and it's not relative to the
497 chroot.
498 .It Ic strip Ar number
499 Strip
500 .Ar number
501 components from the beginning of the path before doing a lookup in the
502 root directory.
503 It's also considered for the
504 .Ar meta
505 parameter in the scope of a
506 .Ic block return .
507 .El
508 .Sh CGI
509 When a request for an executable file matches the
510 .Ic cgi
511 rule, that file will be executed and its output fed to the client.
512 .Pp
513 The CGI scripts are executed in the directory they reside and inherit
514 the environment from
515 .Nm
516 with these additional variables set:
517 .Bl -tag -width 24m
518 .It Ev GATEWAY_INTERFACE
519 .Dq CGI/1.1
520 .It Ev GEMINI_DOCUMENT_ROOT
521 The root directory of the virtual host.
522 .It Ev GEMINI_SCRIPT_FILENAME
523 Full path to the CGI script being executed.
524 .It Ev GEMINI_URL
525 The full IRI of the request.
526 .It Ev GEMINI_URL_PATH
527 The path of the request.
528 .It Ev PATH_INFO
529 The portion of the requested path that is derived from the the IRI
530 path hierarchy following the part that identifies the script itself.
531 Can be unset.
532 .It Ev PATH_TRANSLATED
533 Present if and only if
534 .Ev PATH_INFO
535 is set.
536 It represent the translation of the
537 .Ev PATH_INFO .
538 .Nm
539 builds this by appending the
540 .Ev PATH_INFO
541 to the virtual host directory root.
542 .It Ev QUERY_STRING
543 The decoded query string.
544 .It Ev REMOTE_ADDR , Ev REMOTE_HOST
545 Textual representation of the client IP.
546 .It Ev REQUEST_METHOD
547 This is present only for RFC3875 (CGI) compliance.
548 It's always set to the empty string.
549 .It Ev SCRIPT_NAME
550 The part of the
551 .Ev GEMINI_URL_PATH
552 that identifies the current CGI script.
553 .It Ev SERVER_NAME
554 The name of the server
555 .It Ev SERVER_PORT
556 The port the server is listening on.
557 .It Ev SERVER_PROTOCOL
558 .Dq GEMINI
559 .It Ev SERVER_SOFTWARE
560 The name and version of the server, i.e.
561 .Dq gmid/1.8
562 .It Ev AUTH_TYPE
563 The string "Certificate" if the client used a certificate, otherwise
564 unset.
565 .It Ev REMOTE_USER
566 The subject of the client certificate if provided, otherwise unset.
567 .It Ev TLS_CLIENT_ISSUER
568 The is the issuer of the client certificate if provided, otherwise
569 unset.
570 .It Ev TLS_CLIENT_HASH
571 The hash of the client certificate if provided, otherwise unset.
572 The format is
573 .Dq ALGO:HASH .
574 .It Ev TLS_VERSION
575 The TLS version negotiated with the peer.
576 .It Ev TLS_CIPHER
577 The cipher suite negotiated with the peer.
578 .It Ev TLS_CIPHER_STRENGTH
579 The strength in bits for the symmetric cipher that is being used with
580 the peer.
581 .It Ev TLS_CLIENT_NOT_AFTER
582 The time corresponding to the end of the validity period of the peer
583 certificate in the ISO 8601 format
584 .Pq e.g. Dq 2021-02-07T20:17:41Z .
585 .It Ev TLS_CLIENT_NOT_BEFORE
586 The time corresponding to the start of the validity period of the peer
587 certificate in the ISO 8601 format.
588 .El
589 .Sh FastCGI
590 .Nm
591 optionally supports FastCGI.
593 .Ic fastcgi
594 rule must be present in a server or location block.
595 Then, all requests matching that server or location will be handled
596 via the specified FastCGI backend.
597 .Pp
598 By default the following variables
599 .Pq parameters
600 are sent, and carry the same semantics as with CGI.
601 More parameters can be added with the
602 .Ic param
603 option.
604 .Pp
605 .Bl -bullet -compact
606 .It
607 GATEWAY_INTERFACE
608 .It
609 GEMINI_URL_PATH
610 .It
611 QUERY_STRING
612 .It
613 REMOTE_ADDR
614 .It
615 REMOTE_HOST
616 .It
617 REQUEST_METHOD
618 .It
619 SERVER_NAME
620 .It
621 SERVER_PROTOCOL
622 .It
623 SERVER_SOFTWARE
624 .It
625 AUTH_TYPE
626 .It
627 REMOTE_USER
628 .It
629 TLS_CLIENT_ISSUER
630 .It
631 TLS_CLIENT_HASH
632 .It
633 TLS_VERSION
634 .It
635 TLS_CIPHER
636 .It
637 TLS_CIPHER_STRENGTH
638 .It
639 TLS_CLIENT_NOT_BEFORE
640 .It
641 TLS_CLIENT_NOT_AFTER
642 .El
643 .Sh MEDIA TYPES
644 To auto-detect the MIME type of the response
645 .Nm
646 looks at the file extension and consults its internal table.
647 By default the following mappings are loaded, but they can be
648 overridden or extended using the
649 .Ic map
650 configuration option.
651 If no MIME is found, the value of
652 .Ic default type
653 matching the file
654 .Ic location
655 will be used, which is
656 .Dq application/octet-stream
657 by default.
658 .Pp
659 .Bl -tag -offset indent -width 14m -compact
660 .It diff
661 text/x-patch
662 .It gemini, gmi
663 text/gemini
664 .It gif
665 image/gif
666 .It jpeg
667 image/jpeg
668 .It jpg
669 image/jpeg
670 .It markdown, md
671 text/markdown
672 .It patch
673 text/x-patch
674 .It pdf
675 application/pdf
676 .It png
677 image/png
678 .It svg
679 image/svg+xml
680 .It txt
681 text/plain
682 .It xml
683 text/xml
684 .El
685 .Sh LOGGING
686 Messages and requests are logged by
687 .Xr syslog 3
688 using the
689 .Dv DAEMON
690 facility or printed on
691 .Em stderr .
692 .Pp
693 Requests are logged with the
694 .Dv NOTICE
695 severity.
696 Each request log entry has the following fields, separated by
697 whitespace:
698 .Pp
699 .Bl -bullet -compact
700 .It
701 Client IP address and the source port number, separated by a colon
702 .It
703 .Sy GET
704 keyword
705 .It
706 Request URL
707 .It
708 Response status
709 .It
710 Response meta
711 .El
712 .Sh EXAMPLES
713 Serve the current directory
714 .Bd -literal -offset indent
715 $ gmid .
716 .Ed
717 .Pp
718 To serve the directory
719 .Pa docs
720 and enable CGI scripts inside
721 .Pa docs/cgi
722 .Bd -literal -offset indent
723 $ mkdir docs/cgi
724 $ cat <<EOF > docs/cgi/hello
725 #!/bin/sh
726 printf "20 text/plain\er\en"
727 echo "hello world"
728 EOF
729 $ chmod +x docs/cgi/hello
730 $ gmid -x '/cgi/*' docs
731 .Ed
732 .Pp
733 An X.509 certificate must be provided to run
734 .Nm
735 using a configuration file.
736 First, the RSA certificate is created using a wildcard common name:
737 .Bd -literal -offset indent
738 # openssl genrsa \-out /etc/ssl/private/example.com.key 4096
739 # openssl req \-new \-x509 \e
740 \-key /etc/ssl/private/example.com.key \e
741 \-out /etc/ssl/example.com.crt \e
742 \-days 36500 \-nodes \e
743 \-subj "/CN=example.com"
744 # chmod 600 /etc/ssl/example.com.crt
745 # chmod 600 /etc/ssl/private/example.com.key
746 .Ed
747 .Pp
748 In the example above, a certificate is valid for one hundred years from
749 the date it was created, which is normal for TOFU.
750 .Pp
751 The following is an example of a possible configuration for a site
752 that enables only TLSv1.3, adds a mime type for the file extension
753 .Qq rtf
754 and defines two virtual host:
755 .Bd -literal -offset indent
756 ipv6 on # enable ipv6
758 protocols "tlsv1.3"
760 map "application/rtf" to-ext "rtf"
762 server "example.com" {
763 cert "/etc/ssl/example.com.crt"
764 key "/etc/ssl/private/example.com.key"
765 root "/var/gemini/example.com"
768 server "it.example.com" {
769 cert "/etc/ssl/example.com.crt"
770 key "/etc/ssl/private/example.com.key"
771 root "/var/gemini/it.example.com"
773 # enable cgi scripts inside "cgi-bin"
774 cgi "/cgi-bin/*"
776 # set the language for text/gemini files
777 lang "it"
779 .Ed
780 .Pp
781 Yet another example, showing how to enable a
782 .Ic chroot
783 and use
784 .Ic location
785 rule
786 .Bd -literal -offset indent
787 chroot "/var/gemini"
788 user "_gmid"
790 server "example.com" {
791 cert "/path/to/cert.pem" # absolute path
792 key "/path/to/key.pem" # also absolute
793 root "/example.com" # relative to the chroot
795 location "/static/*" {
796 # load the following rules only for
797 # requests that matches "/static/*"
799 auto index on
800 index "index.gemini"
803 .Ed
804 .Sh ACKNOWLEDGEMENTS
805 .Nm
806 uses the
807 .Dq Flexible and Economical
808 UTF-8 decoder written by
809 .An Bjoern Hoehrmann .
810 .Sh AUTHORS
811 .An -nosplit
812 The
813 .Nm
814 program was written by
815 .An Omar Polo Aq Mt op@omarpolo.com .
816 .Sh CAVEATS
817 .Bl -bullet
818 .It
819 All the root directories are opened during the daemon startup; if a
820 root directory is deleted and then re-created,
821 .Nm
822 won't be able to serve files inside that directory until a restart.
823 This restriction only applies to the root directories and not their
824 content.
825 .It
826 a %2F sequence is indistinguishable from a literal slash: this is not
827 RFC3986-compliant.
828 .It
829 a %00 sequence is treated as invalid character and thus rejected.
830 .El