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httpd_post_upload.txt example: handle binary files too

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-11-13 09:37:50 +01:00
parent 5799248976
commit e3600a042e
1 changed files with 26 additions and 37 deletions
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63
networking/httpd_post_upload.txt
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@ -24,53 +24,42 @@ post_upload.cgi
# ^M <--------- extra empty line
# -----------------------------29995809218093749221856446032--^M
# Beware: bashism $'\r' is used to handle ^M
file=/tmp/$$-$RANDOM
CR=`printf '\r'`
# CGI output must start with at least empty line (or headers)
printf '\r\n'
IFS=$'\r'
IFS="$CR"
read -r delim_line
IFS=''
delim_line="${delim_line}--"$'\r'
IFS=""
while read -r line; do
test "$line" = '' && break
test "$line" = $'\r' && break
test x"$line" = x"" && break
test x"$line" = x"$CR" && break
done
# This will not work well for binary files: bash 3.2 is upset
# by reading NUL bytes and loses chunks of data.
# If you are not bothered by having junk appended to the uploaded file,
# consider using simple "cat >file" instead of the entire
# fragment below.
cat >"$file"
while read -r line; do
# We need to delete the tail of "\r\ndelim_line--\r\n"
tail_len=$((${#delim_line} + 6))
while test "$line" = $'\r'; do
read -r line
test "$line" = "$delim_line" && {
# Aha! Empty line + delimiter! All done
cat <<EOF
<html>
<body>
File upload has been accepted
EOF
exit 0
}
# Empty line + NOT delimiter. Save empty line,
# and go check next line
printf "%s\n" $'\r' >&3
done
# Not empty line - just save
printf "%s\n" "$line" >&3
done 3>"$file"
# Get and check file size
filesize=`stat -c"%s" "$file"`
test "$filesize" -lt "$tail_len" && exit 1
cat <<EOF
<html>
<body>
File upload was not terminated with '$delim_line' - ??!
EOF
# Check that tail is correct
dd if="$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"