135 lines
3.7 KiB
Lua
135 lines
3.7 KiB
Lua
-----------------------------------------------------------------------------
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-- Unified SMTP/FTP subsystem
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-- LuaSocket toolkit.
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-- Author: Diego Nehab
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-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------
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-- Declare module and import dependencies
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-----------------------------------------------------------------------------
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local base = _G
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local string = require("string")
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local socket = require("socket")
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local ltn12 = require("ltn12")
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socket.tp = {}
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local _M = socket.tp
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-----------------------------------------------------------------------------
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-- Program constants
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-----------------------------------------------------------------------------
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_M.TIMEOUT = 60
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-----------------------------------------------------------------------------
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-- Implementation
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-----------------------------------------------------------------------------
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-- gets server reply (works for SMTP and FTP)
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local function get_reply(c)
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local code, current, sep
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local line, err = c:receive()
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local reply = line
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if err then return nil, err end
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code, sep = socket.skip(2, string.find(line, "^(%d%d%d)(.?)"))
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if not code then return nil, "invalid server reply" end
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if sep == "-" then -- reply is multiline
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repeat
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line, err = c:receive()
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if err then return nil, err end
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current, sep = socket.skip(2, string.find(line, "^(%d%d%d)(.?)"))
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reply = reply .. "\n" .. line
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-- reply ends with same code
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until code == current and sep == " "
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end
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return code, reply
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end
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-- metatable for sock object
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local metat = { __index = {} }
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function metat.__index:getpeername()
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return self.c:getpeername()
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end
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function metat.__index:getsockname()
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return self.c:getpeername()
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end
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function metat.__index:check(ok)
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local code, reply = get_reply(self.c)
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if not code then return nil, reply end
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if base.type(ok) ~= "function" then
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if base.type(ok) == "table" then
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for i, v in base.ipairs(ok) do
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if string.find(code, v) then
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return base.tonumber(code), reply
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end
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end
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return nil, reply
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else
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if string.find(code, ok) then return base.tonumber(code), reply
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else return nil, reply end
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end
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else return ok(base.tonumber(code), reply) end
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end
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function metat.__index:command(cmd, arg)
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cmd = string.upper(cmd)
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if arg then
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return self.c:send(cmd .. " " .. arg.. "\r\n")
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else
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return self.c:send(cmd .. "\r\n")
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end
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end
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function metat.__index:sink(snk, pat)
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local chunk, err = self.c:receive(pat)
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return snk(chunk, err)
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end
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function metat.__index:send(data)
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return self.c:send(data)
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end
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function metat.__index:receive(pat)
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return self.c:receive(pat)
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end
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function metat.__index:getfd()
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return self.c:getfd()
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end
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function metat.__index:dirty()
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return self.c:dirty()
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end
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function metat.__index:getcontrol()
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return self.c
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end
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function metat.__index:source(source, step)
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local sink = socket.sink("keep-open", self.c)
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local ret, err = ltn12.pump.all(source, sink, step or ltn12.pump.step)
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return ret, err
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end
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-- closes the underlying c
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function metat.__index:close()
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self.c:close()
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return 1
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end
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-- connect with server and return c object
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function _M.connect(host, port, timeout, create)
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local c, e = (create or socket.tcp)()
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if not c then return nil, e end
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c:settimeout(timeout or _M.TIMEOUT)
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local r, e = c:connect(host, port)
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if not r then
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c:close()
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return nil, e
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end
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return base.setmetatable({c = c}, metat)
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end
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return _M
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