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|
#!/bin/sh -eu
#
# httpshare -- A simple shell script that shares a file over HTTP
#
# Copyright (c) 2019 Samuel Lidén Borell <samuel@kodafritt.se>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# 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 OR COPYRIGHT HOLDERS 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.
#
export LC_ALL=C.UTF-8
log() {
level="$1"
message="$2"
date="$(date --rfc-3339=seconds)"
printf '%s\n' "$date [$level] $message" >&2
}
if [ $# = 0 ] || [ "$1" = --help ]; then
cat <<EOF
usage: $0 FILE
Listens on port 1111 and sends the given file to each HTTP client
that connects. The HTTP client can be, for example, a browser, or
a download utility such as curl or wget.
Note: This script is intended for transferring files over a firewalled
network (or a secure point-to-point network link). It does not offer any
security at all, and it does not handle concurrent users.
EOF
[ $# = 1 ]
exit
fi
if [ "$1" != --internal-send ]; then
if [ "$1" = -- ]; then
shift
fi
port=1111
log WARNING "This script does NOT offer any security at all!"
# Determine IP address, so we can show a IP
# FIXME this is IPv4 only for now, but this script is intended for LAN use only
# example.com = 93.184.216.34
ip=$(ip route get 93.184.216.34 | grep -oE 'src [^ \t]+' | cut -c '5-' || true)
urltext="${ip:+, URL is http://$ip:$port/}"
log INFO "Listening at port $port$urltext"
log INFO "Sharing file \"$1\""
while nc.traditional -c "'$0' --internal-send '$1'" -n -l -p "$port"; do
true
done
exit
fi
log INFO "Client connected"
cr=$(printf '\r')
resp_header() {
respcode="$1"
statusline="$2"
cat <<EOF
HTTP/1.0 $respcode $statusline$cr
Content-Type: text/html; charset=UTF-8$cr
X-Frame-Options: DENY$cr
X-Content-Type-Options: nosniff$cr
Content-Security-Policy: default-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'$cr
$cr
EOF
}
resp_message() {
respcode="$1"
statusline="$2"
resp_header "$respcode" "$statusline"
cat <<EOF
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type; charset=UTF-8">
<title>$statusline</title>
</head>
<body>
<h2>$statusline</h2>
</body>
</html>
EOF
}
skip_headers() {
while read -r line; do
line=${line%$cr}
[ -n "$line" ] || break
done
}
read -r reqline
without_get=${reqline#GET }
without_get=${without_get#get }
without_head=${reqline#HEAD }
without_head=${without_head#head }
if [ "${without_get}" != "$reqline" ]; then
# GET request
method=GET
url_ver=$without_get
elif [ "${without_head}" != "$reqline" ]; then
# HEAD request
method=HEAD
url_ver=$without_head
else
skip_headers
resp_message 405 'Method not allowed'
exit
fi
if [ "${url_ver#/ }" = "$url_ver" ]; then
skip_headers
resp_message 404 'Incorrect URL'
exit
fi
# TODO parse range requests?
skip_headers
filename=$2
filesize=$(stat -Lc %s -- "$filename")
basename=$(basename -- "$filename")
# FIXME long filenames are not sent in accordance to RFC-2183
# FIXME escape the filename
cat <<EOF
HTTP/1.0 200 Ok$cr
Content-Type: application/octet-stream; charset=UTF-8$cr
Content-Length: $filesize$cr
Content-Disposition: attachment; filename="$basename"$cr
X-Frame-Options: DENY$cr
X-Content-Type-Options: nosniff$cr
$cr
EOF
if [ "$method" = HEAD ]; then
exit
fi
log INFO "Sending file \"$filename\""
cat -- "$filename"
log INFO "Successfully sent file."
|
