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| Author | SHA1 | Date | |
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| acbfcc8bdc | |||
| 6c33be9ba3 |
34
demo.lua
34
demo.lua
@ -37,10 +37,10 @@ or
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choose one of the demo programs below.
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<DIV CLASS="menubar">
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<A HREF="/demo.lua?hello">hello</A>
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<A HREF="./demo.lua?hello">hello</A>
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</DIV>
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<FORM ACTION="/demo.lua" METHOD="POST">
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<FORM ACTION="./demo.lua" METHOD="POST">
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<TEXTAREA ROWS="16" COLS="72" NAME="input" maxlength="2000">]]
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-- demo.lua
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@ -49,20 +49,6 @@ choose one of the demo programs below.
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local T=""
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local E,I
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-- convert input to plain text
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if os.getenv("REQUEST_METHOD") == "POST" then
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T=io.read"*a"
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T=string.match(T,"=(.-)$") or ""
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T=string.gsub(T,"+"," ")
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T=string.gsub(T,"%%(%x%x)",function (x) return string.char(tonumber(x,16)) end)
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T=string.gsub(T,"^%s*=%s*","return ")
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if T ~= "" then
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log=io.open("/logs/lua.log", "a")
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log:write("-- ", os.date(), "\n", T, "\n\n")
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log:close()
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end
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end
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-- save functions needed at the end
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local _G=_G
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local collectgarbage=collectgarbage
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@ -81,6 +67,20 @@ if query ~= "" then
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T=demos[query] or ""
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end
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-- convert input to plain text
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if os.getenv("REQUEST_METHOD") == "POST" then
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T=io.read"*a"
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T=string.match(T,"=(.-)$") or ""
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T=string.gsub(T,"+"," ")
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T=string.gsub(T,"%%(%x%x)",function (x) return string.char(tonumber(x,16)) end)
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T=string.gsub(T,"^%s*=%s*","return ")
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if T ~= "" then
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log=io.open("/logs/lua.log", "a")
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log:write("-- ", os.date(), "\n", T, "\n\n")
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log:close()
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end
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end
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-- continue HTML began in shell script
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write(T)
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write[[</TEXTAREA>
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@ -88,7 +88,7 @@ write[[</TEXTAREA>
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<INPUT TYPE="submit" VALUE="run">
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<INPUT TYPE="button" VALUE="clear" onclick="this.form.elements['input'].value=''">
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<INPUT TYPE="reset" VALUE="restore">
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<INPUT TYPE="button" VALUE="restart" onclick="window.location.href='/demo.lua'">
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<INPUT TYPE="button" VALUE="restart" onclick="window.location.href='./demo.lua'">
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</FORM>
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]]
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io.flush()
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164
demo.ngx.lua
Executable file
164
demo.ngx.lua
Executable file
@ -0,0 +1,164 @@
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#! /lua/lua
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-- vi: set noexpandtab :vi
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ngx.header.content_type = "text.html"
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print=ngx.say
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print[[
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<!DOCTYPE html>
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<HTML>
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<HEAD>
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<TITLE>Lua: demo</TITLE>
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<LINK REL="stylesheet" TYPE="text/css" HREF="https://lua.org/lua.css">
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<META HTTP-EQUIV="content-type" CONTENT="text/html; charset=utf-8">
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<STYLE TYPE="text/css">
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textarea {
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font-family: monospace ;
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}
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input {
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margin-right: 1em ;
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}
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</STYLE>
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</HEAD>
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<BODY>
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<H1>
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<A HREF="https://lua.org/home.html"><IMG SRC="https://lua.org/images/logo.gif" ALT="Lua"></A>
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Demo
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</H1>
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<P>
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Try Lua before
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<A HREF="https://lua.org/download.html">downloading</A> it.
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Enter your Lua program
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or
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choose one of the demo programs below.
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<DIV CLASS="menubar">
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<A HREF="./demo.lua?hello">hello</A>
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</DIV>
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<FORM ACTION="./demo.lua" METHOD="POST">
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<TEXTAREA ROWS="16" COLS="72" NAME="input" maxlength="2000">]]
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-- demo.lua
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-- run user programs in constrained environment
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local T=""
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local E,I
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-- save functions needed at the end
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local _G=_G
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local collectgarbage=collectgarbage
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local pack=table.pack
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local tostring=tostring
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local unpack=table.unpack
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local write=ngx.print
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-- snippets
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local demos = {}
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demos["hello"] = "setmetatable({}, {__gc = function() print[[hello shenjack]] end})"
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local query=ngx.req.get_uri_args(1)
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if query ~= nil then
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for k,_ in pairs(query) do
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T=demos[k] or ""
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end
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end
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-- convert input to plain text
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if ngx.req.get_method() == "POST" then
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ngx.req.read_body()
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T=ngx.req.get_body_data()
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T=string.match(T,"=(.-)$") or ""
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T=string.gsub(T,"+"," ")
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T=string.gsub(T,"%%(%x%x)",function (x) return string.char(tonumber(x,16)) end)
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T=string.gsub(T,"^%s*=%s*","return ")
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-- if T ~= "" then
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-- log=io.open("/logs/lua.log", "a")
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-- log:write("-- ", os.date(), "\n", T, "\n\n")
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-- log:close()
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-- end
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end
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-- continue HTML began in shell script
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write(T)
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write[[</TEXTAREA>
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<P>
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<INPUT TYPE="submit" VALUE="run">
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<INPUT TYPE="button" VALUE="clear" onclick="this.form.elements['input'].value=''">
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<INPUT TYPE="reset" VALUE="restore">
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<INPUT TYPE="button" VALUE="restart" onclick="window.location.href='./demo.lua'">
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</FORM>
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]]
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ngx.flush()
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-- the serious thing begins
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if ngx.req.get_method() == "POST" then
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-- limit resource
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--local steplimit = 1000
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--local memlimit = 1000
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--
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--local count = 0
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--local function step ()
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-- count = count + 1
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-- if collectgarbage("count") > memlimit then
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-- error("DoSer uses too much memory")
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-- end
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-- if count > steplimit then
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-- error("DoSer uses too much CPU")
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-- end
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--end
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--
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--debug.sethook(step, "", 100)
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-- delete unsafe functions
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arg=nil
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debug.debug=nil
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debug.getfenv=getfenv
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debug.getregistry=nil
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dofile=nil
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io={write=io.write}
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loadfile=nil
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os.execute=nil
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os.getenv=nil
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os.remove=nil
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os.rename=nil
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os.tmpname=nil
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package.loaded.io=io
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package.loaded.package=nil
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--package=nil
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require=nil
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-- run program in global environment
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write[[<H2>Output</H2>
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<TEXTAREA ROWS="8" COLS="72">]]
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T,E=load(T,"=input","t")
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if not T then
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print(E) E="failed to compile" I="alert"
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else
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T=pack(pcall(T))
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_G.tostring=tostring
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if not T[1] then
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print(T[2]) E="failed to run" I="alert"
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else
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print(unpack(T,2,T.n)) E="ran successfully" I="ok"
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end
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collectgarbage()
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end
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write("\n-- steps/100:\t", count, "\n")
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write("-- memory:\t", string.format("%.2f",collectgarbage("count")), "\n")
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-- continue HTML
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write('</TEXTAREA><P><IMG SRC="https://lua.org/images/',I,'.png" ALIGN="absbottom">\n')
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write('Your program ',E,'.\n')
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ngx.flush()
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end
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