323 lines
10 KiB
Lua
323 lines
10 KiB
Lua
-----------------------------------------------------------------------------
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-- FTP support for the Lua language
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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 tp = require("socket.tp")
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socket.ftp = {}
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local _M = socket.ftp
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-----------------------------------------------------------------------------
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-- Program constants
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-----------------------------------------------------------------------------
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-- timeout in seconds before the program gives up on a connection
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_M.TIMEOUT = 60
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-- default port for ftp service
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local PORT = 21
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-- this is the default anonymous password. used when no password is
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-- provided in url. should be changed to your e-mail.
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_M.USER = "ftp"
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_M.PASSWORD = "anonymous@anonymous.org"
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-----------------------------------------------------------------------------
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-- Low level FTP API
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-----------------------------------------------------------------------------
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local metat = { __index = {} }
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function _M.open(server, port, create)
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local tp = socket.try(tp.connect(server, port or PORT, _M.TIMEOUT, create))
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local f = setmetatable({ tp = tp }, metat)
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-- make sure everything gets closed in an exception
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f.try = socket.newtry(function() f:close() end)
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return f
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end
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function metat.__index:portconnect()
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self.try(self.server:settimeout(_M.TIMEOUT))
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self.data = self.try(self.server:accept())
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self.try(self.data:settimeout(_M.TIMEOUT))
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end
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function metat.__index:pasvconnect()
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self.data = self.try(socket.tcp())
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self.try(self.data:settimeout(_M.TIMEOUT))
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self.try(self.data:connect(self.pasvt.address, self.pasvt.port))
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end
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function metat.__index:login(user, password)
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self.try(self.tp:command("user", user or _M.USER))
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local code, reply = self.try(self.tp:check{"2..", 331})
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if code == 331 then
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self.try(self.tp:command("pass", password or _M.PASSWORD))
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self.try(self.tp:check("2.."))
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end
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return 1
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end
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function metat.__index:pasv()
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self.try(self.tp:command("pasv"))
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local code, reply = self.try(self.tp:check("2.."))
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local pattern = "(%d+)%D(%d+)%D(%d+)%D(%d+)%D(%d+)%D(%d+)"
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local a, b, c, d, p1, p2 = socket.skip(2, string.find(reply, pattern))
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self.try(a and b and c and d and p1 and p2, reply)
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self.pasvt = {
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address = string.format("%d.%d.%d.%d", a, b, c, d),
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port = p1*256 + p2
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}
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if self.server then
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self.server:close()
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self.server = nil
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end
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return self.pasvt.address, self.pasvt.port
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end
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function metat.__index:epsv()
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self.try(self.tp:command("epsv"))
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local code, reply = self.try(self.tp:check("229"))
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local pattern = "%((.)(.-)%1(.-)%1(.-)%1%)"
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local d, prt, address, port = string.match(reply, pattern)
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self.try(port, "invalid epsv response")
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self.pasvt = {
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address = self.tp:getpeername(),
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port = port
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}
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if self.server then
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self.server:close()
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self.server = nil
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end
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return self.pasvt.address, self.pasvt.port
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end
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function metat.__index:port(address, port)
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self.pasvt = nil
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if not address then
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address, port = self.try(self.tp:getsockname())
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self.server = self.try(socket.bind(address, 0))
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address, port = self.try(self.server:getsockname())
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self.try(self.server:settimeout(_M.TIMEOUT))
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end
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local pl = math.mod(port, 256)
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local ph = (port - pl)/256
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local arg = string.gsub(string.format("%s,%d,%d", address, ph, pl), "%.", ",")
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self.try(self.tp:command("port", arg))
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self.try(self.tp:check("2.."))
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return 1
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end
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function metat.__index:eprt(family, address, port)
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self.pasvt = nil
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if not address then
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address, port = self.try(self.tp:getsockname())
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self.server = self.try(socket.bind(address, 0))
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address, port = self.try(self.server:getsockname())
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self.try(self.server:settimeout(_M.TIMEOUT))
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end
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local arg = string.format("|%s|%s|%d|", family, address, port)
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self.try(self.tp:command("eprt", arg))
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self.try(self.tp:check("2.."))
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return 1
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end
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function metat.__index:send(sendt)
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self.try(self.pasvt or self.server, "need port or pasv first")
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-- if there is a pasvt table, we already sent a PASV command
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-- we just get the data connection into self.data
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if self.pasvt then self:pasvconnect() end
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-- get the transfer argument and command
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local argument = sendt.argument or
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url.unescape(string.gsub(sendt.path or "", "^[/\\]", ""))
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if argument == "" then argument = nil end
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local command = sendt.command or "stor"
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-- send the transfer command and check the reply
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self.try(self.tp:command(command, argument))
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local code, reply = self.try(self.tp:check{"2..", "1.."})
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-- if there is not a pasvt table, then there is a server
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-- and we already sent a PORT command
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if not self.pasvt then self:portconnect() end
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-- get the sink, source and step for the transfer
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local step = sendt.step or ltn12.pump.step
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local readt = { self.tp }
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local checkstep = function(src, snk)
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-- check status in control connection while downloading
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local readyt = socket.select(readt, nil, 0)
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if readyt[tp] then code = self.try(self.tp:check("2..")) end
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return step(src, snk)
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end
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local sink = socket.sink("close-when-done", self.data)
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-- transfer all data and check error
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self.try(ltn12.pump.all(sendt.source, sink, checkstep))
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if string.find(code, "1..") then self.try(self.tp:check("2..")) end
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-- done with data connection
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self.data:close()
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-- find out how many bytes were sent
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local sent = socket.skip(1, self.data:getstats())
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self.data = nil
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return sent
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end
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function metat.__index:receive(recvt)
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self.try(self.pasvt or self.server, "need port or pasv first")
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if self.pasvt then self:pasvconnect() end
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local argument = recvt.argument or
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url.unescape(string.gsub(recvt.path or "", "^[/\\]", ""))
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if argument == "" then argument = nil end
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local command = recvt.command or "retr"
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self.try(self.tp:command(command, argument))
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local code,reply = self.try(self.tp:check{"1..", "2.."})
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if (code >= 200) and (code <= 299) then
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recvt.sink(reply)
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return 1
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end
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if not self.pasvt then self:portconnect() end
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local source = socket.source("until-closed", self.data)
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local step = recvt.step or ltn12.pump.step
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self.try(ltn12.pump.all(source, recvt.sink, step))
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if string.find(code, "1..") then self.try(self.tp:check("2..")) end
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self.data:close()
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self.data = nil
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return 1
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end
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function metat.__index:cwd(dir)
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self.try(self.tp:command("cwd", dir))
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self.try(self.tp:check(250))
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return 1
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end
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function metat.__index:type(type)
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self.try(self.tp:command("type", type))
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self.try(self.tp:check(200))
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return 1
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end
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function metat.__index:greet()
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local code = self.try(self.tp:check{"1..", "2.."})
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if string.find(code, "1..") then self.try(self.tp:check("2..")) end
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return 1
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end
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function metat.__index:quit()
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self.try(self.tp:command("quit"))
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self.try(self.tp:check("2.."))
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return 1
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end
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function metat.__index:close()
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if self.data then self.data:close() end
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if self.server then self.server:close() end
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return self.tp:close()
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end
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-----------------------------------------------------------------------------
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-- High level FTP API
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-----------------------------------------------------------------------------
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local function override(t)
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if t.url then
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local u = url.parse(t.url)
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for i,v in pairs(t) do
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u[i] = v
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end
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return u
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else return t end
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end
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local function tput(putt)
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putt = override(putt)
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socket.try(putt.host, "missing hostname")
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local f = _M.open(putt.host, putt.port, putt.create)
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f:greet()
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f:login(putt.user, putt.password)
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if putt.type then f:type(putt.type) end
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f:epsv()
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local sent = f:send(putt)
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f:quit()
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f:close()
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return sent
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end
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local default = {
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path = "/",
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scheme = "ftp"
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}
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local function genericform(u)
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local t = socket.try(url.parse(u, default))
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socket.try(t.scheme == "ftp", "wrong scheme '" .. t.scheme .. "'")
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socket.try(t.host, "missing hostname")
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local pat = "^type=(.)$"
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if t.params then
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t.type = socket.skip(2, string.find(t.params, pat))
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socket.try(t.type == "a" or t.type == "i",
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"invalid type '" .. t.type .. "'")
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end
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return t
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end
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_M.genericform = genericform
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local function sput(u, body)
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local putt = genericform(u)
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putt.source = ltn12.source.string(body)
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return tput(putt)
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end
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_M.put = socket.protect(function(putt, body)
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if type(putt) == "string" then return sput(putt, body)
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else return tput(putt) end
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end)
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local function tget(gett)
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gett = override(gett)
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socket.try(gett.host, "missing hostname")
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local f = _M.open(gett.host, gett.port, gett.create)
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f:greet()
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f:login(gett.user, gett.password)
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if gett.type then f:type(gett.type) end
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f:epsv()
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f:receive(gett)
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f:quit()
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return f:close()
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end
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local function sget(u)
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local gett = genericform(u)
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local t = {}
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gett.sink = ltn12.sink.table(t)
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tget(gett)
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return table.concat(t)
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end
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_M.command = socket.protect(function(cmdt)
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cmdt = override(cmdt)
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socket.try(cmdt.host, "missing hostname")
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socket.try(cmdt.command, "missing command")
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local f = _M.open(cmdt.host, cmdt.port, cmdt.create)
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f:greet()
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f:login(cmdt.user, cmdt.password)
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if type(cmdt.command) == "table" then
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local argument = cmdt.argument or {}
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local check = cmdt.check or {}
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for i,cmd in ipairs(cmdt.command) do
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f.try(f.tp:command(cmd, argument[i]))
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if check[i] then f.try(f.tp:check(check[i])) end
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end
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else
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f.try(f.tp:command(cmdt.command, cmdt.argument))
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if cmdt.check then f.try(f.tp:check(cmdt.check)) end
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end
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f:quit()
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return f:close()
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end)
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_M.get = socket.protect(function(gett)
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if type(gett) == "string" then return sget(gett)
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else return tget(gett) end
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end)
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return _M
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