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annotate etc/forward.lua @ 0:4b915342e2a8

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LuaSocket 2.0.2 + CMake build description.
author Eric Wing <ewing . public |-at-| gmail . com>
date Tue, 26 Aug 2008 18:40:01 -0700
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4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
Eric Wing <ewing . public |-at-| gmail . com>
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1 -- load our favourite library
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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2 local dispatch = require("dispatch")
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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3 local handler = dispatch.newhandler()
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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4
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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5 -- make sure the user knows how to invoke us
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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6 if table.getn(arg) < 1 then
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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7 print("Usage")
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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8 print(" lua forward.lua <iport:ohost:oport> ...")
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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9 os.exit(1)
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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10 end
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11
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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12 -- function to move data from one socket to the other
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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13 local function move(foo, bar)
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14 local live
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15 while 1 do
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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16 local data, error, partial = foo:receive(2048)
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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17 live = data or error == "timeout"
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18 data = data or partial
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19 local result, error = bar:send(data)
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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20 if not live or not result then
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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21 foo:close()
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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22 bar:close()
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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23 break
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24 end
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25 end
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26 end
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27
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28 -- for each tunnel, start a new server
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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29 for i, v in ipairs(arg) do
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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30 -- capture forwarding parameters
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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31 local _, _, iport, ohost, oport = string.find(v, "([^:]+):([^:]+):([^:]+)")
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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32 assert(iport, "invalid arguments")
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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33 -- create our server socket
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34 local server = assert(handler.tcp())
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35 assert(server:setoption("reuseaddr", true))
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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36 assert(server:bind("*", iport))
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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37 assert(server:listen(32))
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38 -- handler for the server object loops accepting new connections
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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39 handler:start(function()
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40 while 1 do
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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41 local client = assert(server:accept())
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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42 assert(client:settimeout(0))
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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43 -- for each new connection, start a new client handler
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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44 handler:start(function()
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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45 -- handler tries to connect to peer
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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46 local peer = assert(handler.tcp())
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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47 assert(peer:settimeout(0))
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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48 assert(peer:connect(ohost, oport))
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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49 -- if sucessful, starts a new handler to send data from
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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50 -- client to peer
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51 handler:start(function()
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52 move(client, peer)
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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53 end)
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54 -- afte starting new handler, enter in loop sending data from
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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55 -- peer to client
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56 move(peer, client)
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57 end)
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58 end
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59 end)
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60 end
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61
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62 -- simply loop stepping the server
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63 while 1 do
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64 handler:step()
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65 end