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|
#!/bin/sh -eu
#
# httprecv -- A simple shell script that receives 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 [ $# = 0 ]; then
port=1111
log WARNING "This script does NOT offer any security at all!"
# Determine IP address, so we can show a IP
# FIXME this is IPv4 only for now, but this script is intended for LAN use only
# example.com = 93.184.216.34
ip=$(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 "Uploaded files will be saved as \"$PWD/upload.bin\""
while nc.traditional -c "'$0' --internal-recv" -n -l -p "$port"; do
true
done
exit
elif [ $# != 1 ] || [ "$1" != --internal-recv ]; then
cat <<EOF
usage: $0
Listens on port 1111 and presents a file upload form. Files received will
be saved as "upload.bin" in the current directory.
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 multiple users well.
EOF
[ "$1" = --help ]
exit
fi
cr=$(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
}
html_head() {
title="$1"
cat <<EOF
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>$title</title>
<style type="text/css">
html, body { background: Window; color: WindowText; font: 90% sans-serif; }
form { width: 25em; margin: 1em auto; padding: 1.5em; background: #fff; color: #000; }
h2 { border-bottom: 1px solid #000; }
h2.err { border: none; text-align: center; margin-top: 2em; }
h2.err::before { content: "⛔ "; }
input { padding: 0.5em; display: block; width: auto; }
#st { text-align: center; font-weight: bold; }
@media(max-width: 35em) {
html, body, form { margin: 0; }
form { background: transparent; color: inherit; }
form, input { display: block; width: auto; }
p { margin-bottom: 2em; }
h2 { text-align: center; border: none; }
}
@media(pointer: coarse) {
p { margin-bottom: 2em; }
input { padding: 1.5em; }
}
@media(max-width: 10cm) {
p, div, input { font-size: 100%; font-weight: bold; }
}
</style>
</head>
<body>
EOF
}
html_footer() {
cat <<EOF
</body>
</html>
EOF
}
resp_message() {
respcode="$1"
statusline="$2"
resp_header "$respcode" "$statusline"
html_head "$statusline"
echo "<h2 class=\"err\">$statusline</h2>"
html_footer
}
skip_headers() {
while read -r line; do
line=${line%$cr}
[ -n "$line" ] || break
done
}
read_multipart_boundary() {
boundary="$1"
read -r line
line="${line%$cr}"
if [ "$line" != "--$boundary" ]; then
resp_message 400 "Bad request"
echo "Error: Unexpected multipart boundary from client." >&2
exit 1
fi
}
read -r reqline
without_get=${reqline#GET }
without_get=${without_get#get }
without_head=${reqline#HEAD }
without_head=${without_head#head }
without_post=${reqline#POST }
without_post=${without_post#post }
if [ "${without_get}" != "$reqline" ]; then
# GET request
method=GET
url_ver=$without_get
elif [ "${without_head}" != "$reqline" ]; then
# HEAD request
method=HEAD
url_ver=$without_head
elif [ "${without_post}" != "$reqline" ]; then
# POST request
method=POST
url_ver=$without_post
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
# Read headers
content_type=""
content_type_boundary=""
content_length=""
while read -r hdr; do
hdr="${hdr%$cr}"
[ -n "$hdr" ] || break
hdrlower=$(printf %s "$hdr" | tr '[:upper:]' '[:lower:]')
hdrname=$(printf %s "$hdrlower" | cut -d ':' -f 1 | tr -s ' \t')
hdrname=${hdrname% }
hdrvalue=$(printf %s "$hdr" | cut -d ':' -f 2- | tr -s ' \t')
hdrvalue=${hdrvalue# }
case "$hdrname" in
content-length)
tmp=$(printf %s "$hdrvalue" | tr -cd 0123456789)
if [ "$tmp" = "$hdrvalue" ]; then
content_length=$tmp
fi
unset tmp;;
content-type)
content_type=$(printf %s "$hdrvalue" | cut -d ';' -f 1 | tr -s ' \t' | tr '[:upper:]' '[:lower:]')
remaining="$hdrvalue"
while true; do
remaining=$(printf %s "$remaining" | cut -sd ';' -f 2- | tr -s ' \t')
remaining=${remaining# }
[ -n "$remaining" ] || break
if [ "${remaining#boundary=}" != "$remaining" ]; then
content_type_boundary=$(printf %s "${remaining#boundary=}" | cut -d ';' -f 1 | tr -s ' \t')
fi
done
unset remaining;;
esac
done
if [ "$method" = HEAD ]; then
cat <<EOF
HTTP/1.0 200 Ok$cr
Content-Type: text/html; charset=UTF-8$cr
X-Frame-Options: DENY$cr
X-Content-Type-Options: nosniff$cr
$cr
EOF
exit
fi
# Handle POST
if [ "$method" = POST ] && [ "$content_length" = 0 ]; then
uploadstatus='Error: No data sent from browser'
elif [ "$method" = POST ]; then
log INFO "Receiving file data ($content_length bytes, including multipart headers)" # header is sanitized, so this is OK
uploadstatus='Upload failed'
if [ "$content_type" != multipart/form-data ]; then
resp_message 415 'Unsupported form encoding'
exit
fi
uploadstatus='Error: Upload was malformed'
if [ -n "$content_length" ]; then
head -c "$content_length" 2>/dev/null
else
cat
fi | {
read_multipart_boundary "$content_type_boundary"
part_length=""
while read -r line; do
line="${line%$cr}"
[ -n "$line" ] || break
hdrlower=$(printf %s "$hdr" | tr '[:upper:]' '[:lower:]')
hdrname=$(printf %s "$hdrlower" | cut -d ':' -f 1 | tr -s ' \t')
hdrname=${hdrname% }
hdrvalue=$(printf %s "$hdr" | cut -d ':' -f 2- | tr -s ' \t')
hdrvalue=${hdrvalue# }
case "$hdrname" in
content-length)
tmp=$(printf %s "$hdrvalue" | tr -cd 0123456789)
if [ "$tmp" = "$hdrvalue" ]; then
part_length=$tmp
fi
unset tmp;;
content-disposition)
true # TODO
;;
esac
done
# if [ -z "$part_length" ]; then
# # TODO
# true
# else
# dd of=upload.bin bs=1 count="$part_length"
# fi
# read_multipart_boundary "$content_type_boundary--"
boundary_length=$(printf '%s' "RN--$boundary--RN" | wc -c) # include space for CR-LF before and after
head -c -"$boundary_length" > upload.bin # FIXME this does not check the final multipart boundary
}
# TODO check for empty file and show a different message
uploadstatus='File was uploaded successfully!'
log INFO "$uploadstatus"
unset line
else
log INFO "Sending start page"
uploadstatus=''
fi
title=${uploadstatus:-File upload}
statusdiv=${uploadstatus:+<div id="st">$uploadstatus</div>}
# Show form
resp_header 200 Ok
html_head "$title"
cat <<EOF
<form enctype="multipart/form-data" method="POST">
<h2>Upload file</h2>
<p><input type="file" name="filedata"></p>
<p><input type="submit" value="Upload file" onclick="if (document.getElementById) { var st = document.getElementById('st'); st.style.display = 'none'; } return true"></p>
$statusdiv
</form>
EOF
html_footer
|
