66 lines
2.0 KiB
Lua
66 lines
2.0 KiB
Lua
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-- load our favourite library
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local dispatch = require("dispatch")
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local handler = dispatch.newhandler()
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-- make sure the user knows how to invoke us
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if #arg < 1 then
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print("Usage")
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print(" lua forward.lua <iport:ohost:oport> ...")
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os.exit(1)
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end
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-- function to move data from one socket to the other
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local function move(foo, bar)
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local live
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while 1 do
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local data, error, partial = foo:receive(2048)
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live = data or error == "timeout"
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data = data or partial
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local result, error = bar:send(data)
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if not live or not result then
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foo:close()
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bar:close()
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break
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end
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end
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end
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-- for each tunnel, start a new server
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for i, v in ipairs(arg) do
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-- capture forwarding parameters
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local _, _, iport, ohost, oport = string.find(v, "([^:]+):([^:]+):([^:]+)")
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assert(iport, "invalid arguments")
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-- create our server socket
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local server = assert(handler.tcp())
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assert(server:setoption("reuseaddr", true))
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assert(server:bind("*", iport))
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assert(server:listen(32))
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-- handler for the server object loops accepting new connections
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handler:start(function()
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while 1 do
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local client = assert(server:accept())
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assert(client:settimeout(0))
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-- for each new connection, start a new client handler
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handler:start(function()
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-- handler tries to connect to peer
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local peer = assert(handler.tcp())
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assert(peer:settimeout(0))
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assert(peer:connect(ohost, oport))
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-- if sucessful, starts a new handler to send data from
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-- client to peer
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handler:start(function()
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move(client, peer)
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end)
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-- afte starting new handler, enter in loop sending data from
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-- peer to client
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move(peer, client)
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end)
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end
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end)
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end
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-- simply loop stepping the server
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while 1 do
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handler:step()
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end
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