2008-04-17 18:05:09 +05:30
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POST upload example:
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post_upload.htm
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===============
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<html>
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<body>
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<form action=/cgi-bin/post_upload.cgi method=post enctype=multipart/form-data>
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File to upload: <input type=file name=file1> <input type=submit>
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</form>
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post_upload.cgi
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===============
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#!/bin/sh
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# POST upload format:
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# -----------------------------29995809218093749221856446032^M
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# Content-Disposition: form-data; name="file1"; filename="..."^M
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# Content-Type: application/octet-stream^M
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# ^M <--------- headers end with empty line
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# file contents
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# file contents
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# file contents
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# ^M <--------- extra empty line
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# -----------------------------29995809218093749221856446032--^M
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file=/tmp/$$-$RANDOM
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2009-11-13 14:07:50 +05:30
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CR=`printf '\r'`
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2008-04-17 18:05:09 +05:30
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# CGI output must start with at least empty line (or headers)
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printf '\r\n'
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2009-11-13 14:07:50 +05:30
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IFS="$CR"
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2008-04-17 18:05:09 +05:30
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read -r delim_line
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2009-11-13 14:07:50 +05:30
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IFS=""
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2008-04-17 18:05:09 +05:30
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while read -r line; do
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2009-11-13 14:07:50 +05:30
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test x"$line" = x"" && break
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test x"$line" = x"$CR" && break
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2008-04-17 18:05:09 +05:30
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done
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2009-11-13 14:07:50 +05:30
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cat >"$file"
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2008-04-17 18:05:09 +05:30
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2009-11-13 14:07:50 +05:30
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# We need to delete the tail of "\r\ndelim_line--\r\n"
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tail_len=$((${#delim_line} + 6))
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2008-04-17 18:05:09 +05:30
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2009-11-13 14:07:50 +05:30
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# Get and check file size
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filesize=`stat -c"%s" "$file"`
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test "$filesize" -lt "$tail_len" && exit 1
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2008-04-17 18:05:09 +05:30
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2009-11-13 14:07:50 +05:30
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# Check that tail is correct
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dd if="$file" skip=$((filesize - tail_len)) bs=1 count=1000 >"$file.tail" 2>/dev/null
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printf "\r\n%s--\r\n" "$delim_line" >"$file.tail.expected"
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if ! diff -q "$file.tail" "$file.tail.expected" >/dev/null; then
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printf "<html>\n<body>\nMalformed file upload"
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exit 1
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fi
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rm "$file.tail"
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rm "$file.tail.expected"
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# Truncate the file
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dd of="$file" seek=$((filesize - tail_len)) bs=1 count=0 >/dev/null 2>/dev/null
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printf "<html>\n<body>\nFile upload has been accepted"
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