-- UNIX Finger Example
local function WriteForm(host, user)
Write([[<!doctype html>
<title>redbean unix finger demo</title>
<style>
body { padding: 1em; }
h1 a { color: inherit; text-decoration: none; }
h1 img { border: none; vertical-align: middle; }
input { margin: .5em; padding: .25em; }
pre { margin-left: 2em; }
p { word-break: break-word; max-width: 650px; }
dt { font-weight: bold; }
dd { margin-top: 1em; margin-bottom: 1em; }
.hdr { text-indent: -1em; padding-left: 1em; }
</style>
<h1>
<a href="/"><img src="/redbean.png"></a>
<a href="unix-finger.lua">redbean unix finger demo</a>
</h1>
<p>
Your redbean is able to function as an finger client. Lua server
pages can use the <code>unix</code> module to implement protocols
that your redbean wasn't originally intended to support. All it
takes is few lines of code!
</p>
<form action="unix-finger.lua" method="post">
<input type="text" id="host" name="host" size="40"
value="%s" placeholder="host" autofocus>
<label for="host">host</label>
<br>
<input type="text" id="user" name="user" size="40"
value="%s" placeholder="user">
<label for="user">user</label>
<br>
<input type="submit" value="finger">
</form>
]] % {EscapeHtml(host), EscapeHtml(user)})
end
local function main()
if IsPublicIp(GetClientAddr()) then
ServeError(403)
elseif GetMethod() == 'GET' or GetMethod() == 'HEAD' then
WriteForm('graph.no', 'new_york')
elseif GetMethod() == 'POST' then
ip = assert(ResolveIp(GetParam('host')))
fd = assert(unix.socket())
assert(unix.connect(fd, ip, 79))
assert(unix.write(fd, GetParam('user') .. '\r\n'))
response = ''
while true do
data = assert(unix.read(fd))
if data == '' then
break
end
response = response .. data
end
assert(unix.close(fd))
WriteForm(GetParam('host'), GetParam('user'))
Write('<pre>\r\n')
Write(EscapeHtml(VisualizeControlCodes(response)))
Write('</pre>\r\n')
else
ServeError(405)
SetHeader('Allow', 'GET, HEAD, POST')
end
end
main()