100 lines of BASH script that simply rock!

ATTENTION

This software should be quite safe, since this checks for some nasty tricks like:

• .. in URL
• / in some places

It binds to port specified from the command line.
It serves only files accessible by the user that runs this script from the current directory (not going up).

Script:

#!/bin/bash

function debug {
    local severity="$1"
    shift
    local message="$@"

    echo -n "`date -u`"    1>&2
    echo -ne '\t'        1>&2
    echo -n "$severity"    1>&2
    echo -ne '\t'        1>&2
    echo "$message"        1>&2
}

function fix_path {
    echo -n "$1" | head -n 1 | sed 's|^[/.-]*||' | sed 's|/\.*|/|g'
}

function serve_dir {
    local dir="`fix_path "$1"`"
    if [ "$dir" = "" ]; then
        dir="./"
    fi
    echo 'HTTP/1.1 200 OK'
    echo 'Content-type: text/html;charset=UTF-8'
    echo
    echo LISTING "$dir"
    echo '<br/>'
    ls -p "$dir" | sed -e 's|^\(.*\)$|<a href="/'"$dir"'\1">\1</a><br/>|'
}

function serve_file {
    echo 'HTTP/1.1 200 OK'
    echo 'Content-type: application/x-download-this'
    echo
    local file="`fix_path "$1"`"
    debug INFO serving file "$file"
    cat "$file"
}

function process {
    local url="`gawk '{print $2}' | head -n 1`"
    case "$url" in
        */)
            debug INFO Processing "$url" as dir
            serve_dir "$url"
            break
            ;;
        *)
            debug INFO Processing "$url" as file
            serve_file "$url"
            ;;
    esac
}

function serve {
    local port="$1"
    local sin="$2"
    local sout="$3"

    while debug INFO Running nc; do

        nc -l -p "$port" < "$sin" > "$sout" &
        pid="$!"

        debug INFO Server PID: "$pid"

        trap cleanup SIGINT
        head -n 1 "$sout" | process > "$sin"
        trap - SIGINT

        debug INFO Killing nc

        kill "$pid"
    done

    debug INFO Quiting server
}

function cleanup {
    debug INFO Caught signal, quitting...
    rm -Rf "$tmp_dir"
    exit
}

tmp_dir="`mktemp -d -t http_server.XXXXXXXXXX`"
sin="$tmp_dir"/in
sout="$tmp_dir"/out
pid=0
port="$1"

mkfifo "$sin"
mkfifo "$sout"

debug INFO Starting server on port "$port"
serve "$port" "$sin" "$sout"
cleanup

Screenshot Tour

STEP 1

STEP 2

STEP 3

STEP 4

STEP 4.5

STEP 5

STEP 6

STEP 7

Dependencies

This script depends on nc (netcat package) being installed in PATH. If you have netcat instead of nc, just change the nc in script to netcat.

Wykop

Jeśli temat Ci się podoba, wykop go!

Comments

Content-type...

Anonymous (82.210.179.178) 1210462958|%e %b %Y, %H:%M %Z|agohover

x-download-this ?

Można lepiej:

function serve_file {
local file="‘fix_path "$1"`"
echo ’HTTP/1.1 200 OK'
printf 'Content-type: %s' "`file -i "$file" | cut -d " " -f 2-`"
echo
debug INFO serving file "$file"
cat "$file"
}

:>

Anonymous (88.199.251.175) 1210487161|%e %b %Y, %H:%M %Z|agohover

A gdzie PHP? :)

php, cgi...

Anonymous (83.13.72.5) 1210490334|%e %b %Y, %H:%M %Z|agohover

CGI czy PHP w trybie CGI mozna do tego typu serwerka dopisac w kolejnych kilku linijkach. serio. :)

lepsze wykrywanie typu mime

rad 1218571368|%e %b %Y, %H:%M %Z|agohover

Anonymous (82.210.179.178) trzy posty wyżej zaproponował takie wykrywanie mime

`file -i "$file" | cut -d " " -f 2-`

można znacznie to uprościć i nie bawić się w cut'owanie wyjścia file, wystarczy dodać opcję b ;) nie wyświetli tego co wycinasz
file -i -b $filename
przykład
rad@ubuntu:~/tmp$ file -i -b 11.jpg
image/jpeg