Bash http server for (x)inetd

#! /bin/bash
#
# Simple http server with CGI support (launched within inetd/xinetd)
# Command line: httpd.sh [-c] [-d <path>]
#         -c        - show content of current directory if index.html is not found
#         -d <path> - set base directory (default - /home/http)
#         -v        - be verbose
#

# simple logger
function msg
{
    [[ $VERBOSE -eq 1 ]] && logger -t httpd.sh -p daemon.info "$1"
}

# cleanup on exit
trap "rm -rf /tmp/httpd" EXIT

# parse command line
SHOW_DIR=0
base=/home/http

OPTIND=1
while getopts cd:v opt ; do
    case "$opt" in
        c) SHOW_DIR=1 ;;
        d) base="$OPTARG" ;;
        v) VERBOSE=1 ;;
    esac
done

# get request
read request

# get header
mkdir -p /tmp/httpd
while true; do
    read header
    echo $header >> /tmp/httpd/header-$$
    [[ "$header" == $'\r' ]] && break;
done

# parse request
url="${request#GET }"
url="${url% HTTP/*}"
query="${url#*\?}"
url="${url%%\?*}"
encoding="utf-8"

# set default start page
[[ $url != "/" ]] && fn="$base$url" || fn="$base/index.html"
if [[ "$url" =~ "cgi-bin" ]]; then
    is_cgi="yes"
    [[ "$query" == "$url" ]] && query=
fi

# decode filename
filename=$(printf '%b' ${fn//%/\\x})
dirname=${filename%index.html}

if [[ $is_cgi == "yes" && -x "$filename" ]]; then
    # run CGI script
    msg "Execute CGI request: $filename"
    export QUERY_STRING="$query"
    echo -e "HTTP/1.1 200 OK\r"
    eval ${filename@Q} $(echo ${query@Q} | sed 's/+/ /g')
    echo -e "\r"
elif [[ -f "$filename" ]]; then
    # show requested file
    msg "Show file: $filename"
    mime=$(file -bi "$filename")
    size=$(wc -c "$filename" | cut -f1 -d' ')
    echo -e "HTTP/1.1 200 OK\r"
    echo -e "Content-Type: $mime\r"
    echo -e "Content-Length: $size\r"
    echo -e "\r"
    cat "$filename"
    echo -e "\r"
elif [[ $SHOW_DIR -eq 1 && -d "$dirname" ]]; then
    # show directory
    msg "Show directory context: $dirname"
    echo -e "HTTP/1.1 200 OK\r"
    echo -e "Content-Type: text/plain; charset=$encoding\r"
    echo -e "\r"
    ls -1gGhB --quoting-style=literal "$dirname"
    echo -e "\r"
else
    # file not found
    msg "File not found: $filename"
    echo -e "HTTP/1.1 404 Not Found\r"
    echo -e "Content-Type: text/html; charset=$encoding\r"
    echo -e "\r"
    echo -e "404 Not Found<br />\r"
    echo -e "The requested resource was not found on the server<br />\r"
    echo -e "\r"
fi