Small Web Server with BusyBox⚓︎

BusyBox includes a small web server that can be started like this:

    httpd -P /var/run/port90.pid -p 90 -c /mod/etc/webcfg.conf -h /var/media/ftp/irgendwo/htdocs/ -r "Port 90"

This line starts the web server on port 90. To reach it, use
http://fritz.box:90. If a file named index.html
has been placed in /var/media/ftp/irgendwo/htdocs/, it is displayed.

Directory contents are not displayed automatically. To add that, create a
CGI script named index.cgi in the cgi-bin subdirectory, in this
example /var/media/ftp/irgendwo/htdocs/cgi-bin/index.cgi.

    #!/bin/sh

    # generate a standards-compliant HTTP header
    echo -en "Content-Type: text/html\r\n\r\n"
    cat << EOF
    <html>
      <head>
        <title>Index of ${QUERY_STRING}</title>
      </head>
      <body>
        <h2>Index of ${QUERY_STRING}</h2>
        <table cellspacing="2" border="0">
          <tr align="left"><th>Name</th><th>&nbsp;&nbsp;Last modified</th><th>&nbsp;&nbsp;Size</th></tr>
          <tr><td colspan="3"><hr></td></tr>
          <tr><td>$([ "$QUERY_STRING" == "/" ] || echo '<a href="..">..</a>')</td></tr>
          $(
            # redirect all errors into the void
            exec 2>/dev/null
            # date format 1 for matching the directory listing
            date_format1="[A-Z][a-z]{2} [A-Z][a-z]{2} [ 123][0-9] [0-9]{2}:[0-9]{2}:[0-9]{2} [0-9]{4}"
            # long replacement expression, kept separate, that generates a table row
            replace="<tr><td><tt><a href="\3">\3<\/a><\/tt><\/td><td><tt>\&nbsp;\&nbsp;\2<\/tt><\/td><td align=right><tt>\&nbsp;\&nbsp;\1<\/tt><\/td><\/tr>"
            # date format 2 for separating a leading space before the day number,
            # which must be replaced by a fixed HTML space, &nbsp;
            date_format2="([A-Z][a-z]{2} [A-Z][a-z]{2} ) ([0-9] [0-9]{2}:[0-9]{2}:[0-9]{2} [0-9]{4})"
            busybox ls -lLep ../${QUERY_STRING} |
              # filter out "cgi-bin" in the root directory
              ([ "$QUERY_STRING" == "/" ] && grep -v 'cgi-bin' || cat) |
              # number lines so the order within both groups, directories and
              # everything else, is preserved later while sorting
              awk '{printf("%5d %s\n", NR,$0)}' |
              # put "X" before directories, "Y" before everything else ("X" < "Y")
              sed -r 's/^([0-9 ]+ d)/X \1/' |
              sed -r 's/^([0-9 ]+)/Y \1/' |
              # sorting groups the entries
              sort |
              # remove sort helpers and unneeded columns
              sed -r 's/^([^ ]+ +){6}(.*)/\2/' |
              # replace directory file sizes with "---"
              sed -r 's/^[0-9]+(.*)\/$/---\1/' |
              # generate one table row per directory entry
              sed -r "s/^([-0-9, ]+) ($date_format1) +(.*)$/$replace/" |
              # special case: leading space before the day number in the date
              sed -r "s/$date_format2/\1\&nbsp;\2/"
          )
        </table>
      </body>
    </html>
    EOF

BusyBox httpd can also execute PHP scripts if the PHP package is
installed. Add this new line to /mod/etc/webcfg.conf:

    *.php:/usr/bin/php-cgi

To process index.php files, insert these lines into the index.cgi
script after the first line:

    if test -s "../${QUERY_STRING}/index.php" ; then
      echo -e "Status: 302 Found\r"
      echo -e "Location: index.php\r"
      exit 0
    fi

Further Links⚓︎

IPPF article