#!/bin/sh # post_upload.htm example: # # #
# File to upload: #
# 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=$(mktemp) CR=`printf '\r'` # CGI output must start with at least empty line (or headers) printf '\r\n' IFS="$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 "\n\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 "\n\nFile upload has been accepted"