moth/packages/mcp/www/register.cgi

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#! /bin/sh -e
param () {
ret=$(echo "$QUERY_STRING" | tr '=&' ' \n' | awk -v "k=$1" '($1==k) {print $2;}')
ret=$(busybox httpd -d "$ret" || echo "$ret")
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echo "$ret"
}
team=$(param n)
hash=$(param h | tr -dc 0-9a-f)
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cat <<EOF
Content-type: text/html
<!DOCTYPE html>
<html>
<head>
<title>Team Registration</title>
<link rel="stylesheet" href="ctf.css" type="text/css">
</head>
<body>
<h1>Team Registration</h1>
EOF
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if [ -z "$hash" ] || [ -z "$team" ]; then
echo "<p>Empty field, cannot complete request</p>"
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elif ! grep -q " $hash$" $CTF_BASE/state/teams/assigned.txt; then
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echo "<p>That hash has not been assigned.</p>"
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elif [ -f $CTF_BASE/state/teams/names/$hash ]; then
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echo "<p>That hash has already been registered.</p>"
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else
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printf "%s" "$team" > $CTF_BASE/state/teams/names/$hash
echo "<p>Okay, your team has been named and you may begin using your hash!</p>"
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fi
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cat <<EOF
</body>
</html>
EOF