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- POST upload example:
- post_upload.htm
- ===============
- <html>
- <body>
- <form action=/cgi-bin/post_upload.cgi method=post enctype=multipart/form-data>
- File to upload: <input type=file name=file1> <input type=submit>
- </form>
- post_upload.cgi
- ===============
- #!/bin/sh
- # 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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