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#!/bin/sh
# post_upload.htm example:
# <html>
# <body>
# <form action=/cgi-bin/httpd_post_upload.cgi method=post enctype=multipart/form-data>
# File to upload: <input type=file name=file1> <input type=submit>
# </form>
# POST upload format:
# -----------------------------29995809218093749221856446032^M
# Content-Disposition: form-data; name="file1"; filename="..."^M
# Content-Type: application/octet-stream^M
# ^M <--------- headers end with empty line
# file contents
# file contents
# file contents
# ^M <--------- extra empty line
# -----------------------------29995809218093749221856446032--^M
file=/tmp/$$-$RANDOM
CR=`printf '\r'`
# CGI output must start with at least empty line (or headers)
printf '\r\n'
IFS="$CR"
read -r delim_line
IFS=""
while read -r line; do
test x"$line" = x"" && break
test x"$line" = x"$CR" && break
done
cat >"$file"
# We need to delete the tail of "\r\ndelim_line--\r\n"
tail_len=$((${#delim_line} + 6))
# Get and check file size
filesize=`stat -c"%s" "$file"`
test "$filesize" -lt "$tail_len" && exit 1
# Check that tail is correct
dd if="$file" skip=$((filesize - tail_len)) bs=1 count=1000 >"$file.tail" 2>/dev/null
printf "\r\n%s--\r\n" "$delim_line" >"$file.tail.expected"
if ! diff -q "$file.tail" "$file.tail.expected" >/dev/null; then
printf "<html>\n<body>\nMalformed file upload"
exit 1
fi
rm "$file.tail"
rm "$file.tail.expected"
# Truncate the file
dd of="$file" seek=$((filesize - tail_len)) bs=1 count=0 >/dev/null 2>/dev/null
printf "<html>\n<body>\nFile upload has been accepted"
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