1 3e4749f7 2020-10-02 op .\" Copyright (c) 2020 Omar Polo <op@omarpolo.com>
  2 3e4749f7 2020-10-02 op .\"
  3 3e4749f7 2020-10-02 op .\" Permission to use, copy, modify, and distribute this software for any
  4 3e4749f7 2020-10-02 op .\" purpose with or without fee is hereby granted, provided that the above
  5 3e4749f7 2020-10-02 op .\" copyright notice and this permission notice appear in all copies.
  6 3e4749f7 2020-10-02 op .\"
  7 3e4749f7 2020-10-02 op .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  8 3e4749f7 2020-10-02 op .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  9 3e4749f7 2020-10-02 op .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 10 3e4749f7 2020-10-02 op .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 11 3e4749f7 2020-10-02 op .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 12 3e4749f7 2020-10-02 op .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 13 3e4749f7 2020-10-02 op .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 14 3e4749f7 2020-10-02 op .Dd $Mdocdate: October 2 2020$
 15 3e4749f7 2020-10-02 op .Dt GMIND 1
 16 3e4749f7 2020-10-02 op .Os
 17 3e4749f7 2020-10-02 op .Sh NAME
 18 3e4749f7 2020-10-02 op .Nm gmid
 19 fab952e1 2020-10-03 op .Nd dead simple zero configuration gemini server
 20 3e4749f7 2020-10-02 op .Sh SYNOPSIS
 21 3e4749f7 2020-10-02 op .Nm
 22 3e4749f7 2020-10-02 op .Bk -words
 23 0ed56567 2020-11-06 op .Op Fl h
 24 3e4749f7 2020-10-02 op .Op Fl c Ar cert.pem
 25 3e4749f7 2020-10-02 op .Op Fl d Ar docs
 26 3e4749f7 2020-10-02 op .Op Fl k Ar key.pem
 27 0ed56567 2020-11-06 op .Op Fl l Ar logfile
 28 0ed56567 2020-11-06 op .Op Fl x Ar cgi-bin
 29 3e4749f7 2020-10-02 op .Ek
 30 3e4749f7 2020-10-02 op .Sh DESCRIPTION
 31 3e4749f7 2020-10-02 op .Nm
 32 0ed56567 2020-11-06 op is a very simple and minimal gemini server that can serve static files
 33 0ed56567 2020-11-06 op and execute CGI scripts.
 34 3e4749f7 2020-10-02 op .Pp
 35 3e4749f7 2020-10-02 op .Nm
 36 3e4749f7 2020-10-02 op will strip any sequence of
 37 3e4749f7 2020-10-02 op .Pa ../
 38 3e4749f7 2020-10-02 op or trailing
 39 3e4749f7 2020-10-02 op .Pa ..
 40 a5d310bc 2020-11-10 op in the requests made by clients and will refuse to follow symlinks.
 41 6980aad6 2020-10-02 op Furthermore, on
 42 6980aad6 2020-10-02 op .Ox ,
 43 6980aad6 2020-10-02 op .Xr pledge 2
 44 3e4749f7 2020-10-02 op and
 45 6980aad6 2020-10-02 op .Xr unveil 2
 46 3e4749f7 2020-10-02 op are used to ensure that
 47 3e4749f7 2020-10-02 op .Nm
 48 0ed56567 2020-11-06 op dosen't do anything else than read files from the given directory,
 49 0ed56567 2020-11-06 op accept network connections and, optionally, execute CGI scripts.
 50 3e4749f7 2020-10-02 op .Pp
 51 3e4749f7 2020-10-02 op It should be noted that
 52 3e4749f7 2020-10-02 op .Nm
 53 3e4749f7 2020-10-02 op is very simple in its implementation, and so it may not be appropriate
 54 0ed56567 2020-11-06 op for serving sites with lots of users.
 55 0ed56567 2020-11-06 op After all, the code is single threaded and use a single process,
 56 0ed56567 2020-11-06 op although it can handle multiple requests concurrently.
 57 3e4749f7 2020-10-02 op .Pp
 58 fab952e1 2020-10-03 op If a user request path is a directory,
 59 fab952e1 2020-10-03 op .Nm
 60 fab952e1 2020-10-03 op will try to serve a
 61 fab952e1 2020-10-03 op .Pa index.gmi
 62 fab952e1 2020-10-03 op file inside that directory.
 63 fab952e1 2020-10-03 op .Pp
 64 3e4749f7 2020-10-02 op The options are as follows:
 65 3e4749f7 2020-10-02 op .Bl -tag -width 12m
 66 3e4749f7 2020-10-02 op .It Fl c Ar cert.pem
 67 3e4749f7 2020-10-02 op The certificate to use, by default is
 68 fab952e1 2020-10-03 op .Pa cert.pem .
 69 3e4749f7 2020-10-02 op .It Fl d Ar docs
 70 3e4749f7 2020-10-02 op The root directory to serve.
 71 3e4749f7 2020-10-02 op .Nm
 72 a5d310bc 2020-11-10 op won't serve any file that is outside that directory.
 73 a5d310bc 2020-11-10 op By default is
 74 0ed56567 2020-11-06 op .Pa docs .
 75 3e4749f7 2020-10-02 op .It Fl h
 76 fab952e1 2020-10-03 op Print the usage and exit.
 77 3e4749f7 2020-10-02 op .It Fl k Ar key.pem
 78 3e4749f7 2020-10-02 op The key for the certificate, by default is
 79 fab952e1 2020-10-03 op .Pa key.pem .
 80 0ed56567 2020-11-06 op .It Fl l Ar logfile
 81 2c3a40fa 2020-11-06 op log to the given file instead of the standard error.
 82 0ed56567 2020-11-06 op .It Fl x Ar dir
 83 0ed56567 2020-11-06 op Enable execution of CGI scripts inside the given directory (relative
 84 0ed56567 2020-11-06 op to the document root.)  Cannot be provided more than once.
 85 3e4749f7 2020-10-02 op .El
 86 72342dc9 2020-11-06 op .Sh CGI
 87 0ed56567 2020-11-06 op When CGI scripts are enabled for a directory, a request for an
 88 0ed56567 2020-11-06 op executable file will execute it and fed its output to the client.
 89 72342dc9 2020-11-06 op .Pp
 90 0ed56567 2020-11-06 op The CGI scripts will inherit the environment from
 91 0ed56567 2020-11-06 op .Nm
 92 0ed56567 2020-11-06 op with these additional variables set:
 93 a5d310bc 2020-11-10 op .Bl -tag -width 18m
 94 0ed56567 2020-11-06 op .It Ev SERVER_SOFTWARE
 95 0ed56567 2020-11-06 op "gmid"
 96 0ed56567 2020-11-06 op .It Ev SERVER_PORT
 97 0ed56567 2020-11-06 op "1965"
 98 a5d310bc 2020-11-10 op .It Ev SCRIPT_NAME
 99 a5d310bc 2020-11-10 op The (public) path to the script.
100 a5d310bc 2020-11-10 op .It Ev SCRIPT_EXECUTABLE
101 a5d310bc 2020-11-10 op The full path to the executable.
102 a5d310bc 2020-11-10 op .It Ev REQUEST_URI
103 a5d310bc 2020-11-10 op The user request (without the query parameters.)
104 a5d310bc 2020-11-10 op .It Ev REQUEST_RELATIVE
105 a5d310bc 2020-11-10 op The request relative to the script.
106 0ed56567 2020-11-06 op .It Ev QUERY_STRING
107 a5d310bc 2020-11-10 op The query parameters.
108 a5d310bc 2020-11-10 op .It Ev REMOTE_HOST
109 a5d310bc 2020-11-10 op The remote IP address.
110 a5d310bc 2020-11-10 op .It Ev DOCUMENT_ROOT
111 a5d310bc 2020-11-10 op The root directory being served, the one provided with the
112 a5d310bc 2020-11-10 op .Ar d
113 a5d310bc 2020-11-10 op parameter to
114 a5d310bc 2020-11-10 op .Nm
115 0ed56567 2020-11-06 op .El
116 a5d310bc 2020-11-10 op .Pp
117 a5d310bc 2020-11-10 op Let's say you have a script in
118 a5d310bc 2020-11-10 op .Pa /cgi-bin/script
119 a5d310bc 2020-11-10 op and the user request is
120 a5d310bc 2020-11-10 op .Pa /cgi-bin/script/foo/bar?quux .
121 a5d310bc 2020-11-10 op Then
122 a5d310bc 2020-11-10 op .Ev SCRIPT_NAME
123 a5d310bc 2020-11-10 op will be
124 a5d310bc 2020-11-10 op .Pa /cgi-bin/script ,
125 a5d310bc 2020-11-10 op .Ev SCRIPT_EXECUTABLE
126 a5d310bc 2020-11-10 op will be
127 a5d310bc 2020-11-10 op .Pa $DOCUMENT_ROOT/cgi-bin/script ,
128 a5d310bc 2020-11-10 op .Ev REQUEST_URI
129 a5d310bc 2020-11-10 op will be
130 a5d310bc 2020-11-10 op .Pa /cgi-bin/script/foo/bar ,
131 a5d310bc 2020-11-10 op .Ev REQUEST_RELATIVE
132 a5d310bc 2020-11-10 op will be
133 a5d310bc 2020-11-10 op .Pa foo/bar and
134 a5d310bc 2020-11-10 op .Ev QUERY_STRING
135 a5d310bc 2020-11-10 op will be
136 a5d310bc 2020-11-10 op .Ar quux .
137 3e4749f7 2020-10-02 op .Sh EXAMPLES
138 3e4749f7 2020-10-02 op To quickly getting started
139 6980aad6 2020-10-02 op .Bd -literal -offset indent
140 3e4749f7 2020-10-02 op $ # generate a cert and a key
141 3e4749f7 2020-10-02 op $ openssl req -x509 -newkey rsa:4096 -keyout key.pem \\
142 3e4749f7 2020-10-02 op         -out cert.pem -days 365 -nodes
143 3e4749f7 2020-10-02 op $ mkdir docs
144 3e4749f7 2020-10-02 op $ cat <<EOF > docs/index.gmi
145 3e4749f7 2020-10-02 op # Hello world
146 3e4749f7 2020-10-02 op test paragraph...
147 3e4749f7 2020-10-02 op EOF
148 3e4749f7 2020-10-02 op $ gmid -c cert.pem -k key.pem -d docs
149 6980aad6 2020-10-02 op .Ed
150 3e4749f7 2020-10-02 op .Pp
151 0ed56567 2020-11-06 op Now you can visit gemini://localhost/ with your preferred gemini
152 0ed56567 2020-11-06 op client.
153 0ed56567 2020-11-06 op .Pp
154 0ed56567 2020-11-06 op To add some CGI scripts, assuming a setup similar to the previous
155 0ed56567 2020-11-06 op example, you can
156 0ed56567 2020-11-06 op .Bd -literal -offset indent
157 0ed56567 2020-11-06 op $ mkdir docs/cgi-bin
158 0ed56567 2020-11-06 op $ cat <<EOF > docs/cgi-bin/hello-world
159 0ed56567 2020-11-06 op #!/bin/sh
160 0ed56567 2020-11-06 op printf "20 text/plain\\r\\n"
161 0ed56567 2020-11-06 op echo "hello world!"
162 0ed56567 2020-11-06 op EOF
163 0ed56567 2020-11-06 op $ gmid -x cgi-bin
164 0ed56567 2020-11-06 op .Ed
165 0ed56567 2020-11-06 op .Pp
166 0ed56567 2020-11-06 op Note that the argument to the
167 0ed56567 2020-11-06 op .Fl x
168 0ed56567 2020-11-06 op option is
169 0ed56567 2020-11-06 op .Pa cgi-bin
170 0ed56567 2020-11-06 op and not
171 0ed56567 2020-11-06 op .Pa docs/cgi-bin ,
172 a5d310bc 2020-11-10 op since it's relative to the document root.
173 3e4749f7 2020-10-02 op .Sh CAVEATS
174 3e4749f7 2020-10-02 op .Bl -bullet
175 3e4749f7 2020-10-02 op .It
176 fab952e1 2020-10-03 op it doesn't support virtual hosts: the host part of the request URL is
177 3e4749f7 2020-10-02 op completely ignored.
178 3e4749f7 2020-10-02 op .It
179 3e4749f7 2020-10-02 op it doesn't fork in the background or anything like that.
180 3e4749f7 2020-10-02 op .El