Totally simple web server using Bash and netcat (nc)

tsws

#!/bin/bash

# --------------------------------
# Totally Simple Web Server (TSWS)
# --------------------------------
#
#  (c) 2015 Dave Fletcher
#  All Rights Reserved
#
#  This is free and unencumbered software released into the public domain.
#
#  Anyone is free to copy, modify, publish, use, compile, sell, or
#  distribute this software, either in source code form or as a compiled
#  binary, for any purpose, commercial or non-commercial, and by any
#  means.
#
#  In jurisdictions that recognize copyright laws, the author or authors
#  of this software dedicate any and all copyright interest in the
#  software to the public domain. We make this dedication for the benefit
#  of the public at large and to the detriment of our heirs and
#  successors. We intend this dedication to be an overt act of
#  relinquishment in perpetuity of all present and future rights to this
#  software under copyright law.

#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
#  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
#  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
#  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
#  OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
#  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
#  OTHER DEALINGS IN THE SOFTWARE.
#
#  For more information, please refer to <http://unlicense.org>
#

# All informative console log messages are piped to here so e.g. it could be
# quieted by setting TSWS_LOG=/dev/null or alternatively logged to a file.
# The default is $(tty) which prints logs to console.
declare -r TSWS_LOG="$(tty)"

# -----------------------------------------------------------------------------
# tsws [host [, port]]
# -----------------------------------------------------------------------------
#
# Start the Totally Simple Web Server. Note that the `tsws` script that this
# function lives in has the same interface as the function: tsws HOST PORT and
# the script itself can be used in the same way as "Example usage" below.
#
# ---------
# Arguments
# ---------
#
#    - host: IP address (or hostname) to listen on. Optional. If not
#            supplied the default value is 127.0.0.1
#
#    - port: Port to listen on. Optional. If not supplied the default
#            value is 18080
#
# -------------
# Example usage
# -------------
#
#  # Launch the webserver. This version will not return, it will loop forever.
#  tsws localhost 8080
#
#  # Alternatively, launch the webserver and return immediately.
#  tsws localhost 8080 &
#  # Catch the PID so we can wait or kill later.
#  declare tsws_pid=$!
#  # Launch a browser. Don't detach, wait for exit.
#  firefox "http://localhost:8080"
#  # User closed the browser, we're done, stop the server.
#  kill ${tsws_pid}
#
# -------------------
# Theory of operation
# -------------------
#
# The nc program opens a network port and begins listening. When an inbound
# connection is made, the STDOUT of nc is pushed to a FIFO pipe. The
# _tsws_response function runs concurrently and waits for input from the FIFO
# pipe. When _tsws_response finds an HTTP request there, it processes and
# returns a well-formed HTTP response back to nc STDIN. nc sends this
# response back to the requesting client.
#
# --------------------------------------------------------------------------
#
#                                        +----+ (1)
#       Browser <===> The Internet <===> | nc | ---> FIFO pipe ---+
#                                        +----+                   |
#                                       (0) ^                     |
#                                           |                     |
#                                           +-- _tsws_response <--+
#
#    - 1: STDOUT of `nc` process which carries HTTP requests.
#    - 0: STDIN of `nc` process which carries HTTP responses.
#    - _tsws_response: handler function reads requests, produces responses.
#
# --------------------------------------------------------------------------
#                                               Diagram: Theory of operation
#
# ------------
# Requirements
# ------------
#
#   - Bash (obviously).
#
#   - Netcat (nc) handles the network listen call for us and binds stdin and
#     stdout of the nc process to connected clients.
#
#   - mkfifo: A FIFO pipe connects the output of nc to our _tsws_response
#     function which processes requests and sends responses back through stdin
#     of nc to browser client.
#
#   - wc -c: For calculating Content-Length.
#
#   - cat, tee: For pushing files and HTTP data through pipes.
#
#   - date: Just to show some dynamic content in www_index.
#
#   - base64: Demonstrates script-embedded binary files.
#
# ---------------------
# Known issues and bugs
# ---------------------
#
#   - This setup almost certainly has issues with concurrency. It is useful for
#     a single local user or demonstration purposes, but please do not use it
#     as a production web server connected to the internet.
#
#   - All HTTP caching is ignored keep things simple.
#
#   - Cygwin doesn't work so great. Particularly, some requests just fail
#     inexplicably with nc never supplying a request or supplying a massively
#     delayed one.
#
#   - It is easily confused, especially if multiple browsers or tabs are
#     pointed to it at the same time. Requests and responses might get dropped
#     (still not quite sure why on that) and the order can get out of whack,
#     sending the wrong file for a request.
#
function tsws {

  local -r host="${1:-127.0.0.1}"
  local -r port="${2:-18080}"
  local -r fifo="$(mktemp -u)"

  # Initialize the FIFO pipe.
  mkfifo -m 600 "${fifo}"
  trap "rm ${fifo}" EXIT INT TERM HUP # Auto-cleanup at exit.

  # Connect _tsws_response to STDIN. Connect STDOUT to FIFO pipe. Then listen
  # on ${host}:${port}. nc -l is "listen" and -k is "listen forever".
  printf $'tsws HTTP/1.1 on %s:%s\n' "${host}" "${port}" > ${TSWS_LOG}
  nc -kl "${host}" ${port} \
    0< <(_tsws_response "${fifo}") \
    1> >(while : ; do cat - > "${fifo}"; done) # Loop keeps pipe open.
}

# -----------------------------------------------------------------------------
# _tsws_response(fifo)
# -----------------------------------------------------------------------------
#
# Internal workhorse function for handling requests and responses for tsws.
# Do not call it directly.
#
function _tsws_response {
  local method path httpvers callback content_type status msg obf clen
  method=""
  while : ; do # Run forever.
    while read -r line; do
      line="$(sed 's/\r//g' <<< "${line}")" # Replace CRLF with /n
      if [ -n "${line}" ]; then
        # ${line} is not empty, it is either a "Request-Line" or a header
        # line. If we have no 'method' yet we assume it is a Request-Line.
        # http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html
        if [ -z "${method}" ]; then
          read -r method path httpvers <<< "${line}"
          continue
        fi
        # TODO: if we cared about any of the request headers, here is the
        # place to read them by parsing ${line}.
      else
        # ${line} is empty, so we received two consecutive CRLF.
        # Process the request.
        #
        # Currently all "files" served up by the server are functions in this
        # script that return content. This shows how dynamic content can be
        # served and keeps this example all in one single file. It should be
        # easy to adapt this to also read real files from disk Hint: obf below
        # and use `file` to get content_type.
        callback="www$(sed -e 's/\//_/g' -e 's/\./_/g' <<< "${path}")"
        [ "${callback}" = "www_" ] && callback="www_index"
        content_type="${callback}_Content_Type"
        content_type="${!content_type}"
        [ -z "${content_type}" ] && content_type="text/plain"
        obf="$(mktemp -u)"
        case "${method:?}" in
          GET)
            if local -f  "${callback}" > /dev/null; then
              # ${callback} is a function we declared.
              status=200; msg="OK"
              ${callback} > "${obf}"
            else
              # ${callback} is not defined.
              status=404; msg="Not Found"
              printf $'Not found: %s.' "${path}" > "${obf}"
            fi
          ;;
          *)
            # Currently we only handle GET requests.
            status=500; msg="Internal Server Error"
            printf $'Server Error: unknown method %s.' "${method}" > "${obf}"
          ;;
        esac
        clen=$(cat "${obf}"|wc -c)
        # Show request in term.
        printf $'%s %s\n' "${method}" "${path}" >${TSWS_LOG}
        # Output headers, tee shows the response headers in term.
        printf $'HTTP/1.1 %s %s\r\n' "${status:?}" "${msg:?}" | tee ${TSWS_LOG}
        printf $'Content-Length: %s\r\n' "${clen}" | tee ${TSWS_LOG}
        printf $'Content-Type: %s\r\n' "${content_type}" | tee ${TSWS_LOG}
        printf $'Connection: close\r\n' | tee ${TSWS_LOG}
        printf $'\r\n' | tee ${TSWS_LOG}
        # Output the response data.
        cat "${obf}"
        rm "${obf}"
        method=""
      fi
    done < "$1"
  done
}


# +---------------------------------------------------------------------------+
# |                                  WWW FILES                                |
# +---------------------------------------------------------------------------+

declare www_index_Content_Type="text/html; charset=utf-8"
function www_index {
cat <<EOF
<!DOCTYPE html>
<html>
  <head>
    <title>Totally Simple Web Server</title>
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
    <script type="text/javascript" src="/site.js"></script>
    <style type="text/css">@import url("/style.css");</style>
  </head>
  <body>
    <h1>Totally Simple Web Server</h1>
    <img class="graphic" src="/graphic.jpg" />
    <b>&copy; 2015 Dave Fletcher</b><br>
    All rights reserved</em><br>
    <p><em>A web server in <a href="https://www.gnu.org/software/bash/">Bash</a> and <a href="http://nc110.sourceforge.net/">Netcat</a>.</em></p>
    <b>$(date)</b><br><br>
    status: ${status} ${msg}<br>
    method: ${method}<br>
    path: ${path}<br>
    httpvers: ${httpvers}<br>
    callback: ${callback}<br>
    <a href="https://gist.github.com/dfletcher/4763be3295bd5638b797" title="Fork me on GitHub"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://camo.githubusercontent.com/e7bbb0521b397edbd5fe43e7f760759336b5e05f/68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f677265656e5f3030373230302e706e67" alt="Fork me on GitHub" data-canonical-src="https://s3.amazonaws.com/github/ribbons/forkme_right_green_007200.png"></a>
  </body>
</html>
EOF
}

declare www_style_css_Content_Type="text/css"
function www_style_css {
cat <<\EOF

@import url(//fonts.googleapis.com/css?family=Lato:400,700,400italic);

BODY {
  font-family: 'Lato', sans-serif;
  margin: 10%;
}

A, A:visited {
  color: #060;
  text-decoration: none;
}

A:active, A:hover {
  color: #393;
  text-decoration: underline;
}

.graphic {
  float: right;
  margin-left: 2em;
  position: relative;
  top: -2em;
  z-index: -1;
}

EOF
}

declare www_site_js_Content_Type="text/javascript"
function www_site_js {
cat <<\EOF
(function ($) {
  //$(document).ready(function() { alert('hi!'); });
}(jQuery));
EOF
}

declare www_graphic_jpg_Content_Type="image/jpeg"
function www_graphic_jpg {
# Note: The base64 here is is just to show how a binary file could be
# returned from a Bash function. As a different type of example, this could
# be the output of ImageMagick instead of a hard-coded base64 jpeg.
base64 -d <<\EOF
/9j/4AAQSkZJRgABAQEASABIAAD/2wBDABALDA4MChAODQ4SERATGCgaGBYWGDEjJR0oOjM9PDkz
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AhEBAxEB/8QAGwABAAIDAQEAAAAAAAAAAAAAAAECAwQFBgf/xAA9EAABAwIEBAMFBwMDBAMAAAAB
AAIDBBEFEiExE0FRYQYicRQyUoGRFSNCYqGx0TNywSRDgiWS4fFjsvD/xAAaAQEAAwEBAQAAAAAA
AAAAAAAAAQIDBAUG/8QAKxEBAAICAgIBBAEFAAMBAAAAAAECAxEhMQQSQRMiMlFhBRQjQnEzUoGR
/9oADAMBAAIRAxEAPwD6AgICAgICAgICAgICAgICAgICAgICAghAQEEoCAgICAgICAgICAgICAgI
CAgICAgICAgICAgICAgICAgICCEAkBBUutuQ0IKGaMfiJQV40R6oJytdqyRzT6/ygo6aWn1mbmj+
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EOF
}


# +---------------------------------------------------------------------------+
# |                                    Main                                   |
# +---------------------------------------------------------------------------+

declare host="${1:-127.0.0.1}"
declare port="${2:-18080}"
tsws "${host}" "${port}"