324 lines
11 KiB
Lua
324 lines
11 KiB
Lua
-----------------------------------------------------------------------------
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-- LPD support for the Lua language
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-- LuaSocket toolkit.
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-- Author: David Burgess
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-- Modified by Diego Nehab, but David is in charge
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-----------------------------------------------------------------------------
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--[[
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if you have any questions: RFC 1179
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]]
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-- make sure LuaSocket is loaded
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local io = require("io")
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local base = _G
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local os = require("os")
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local math = require("math")
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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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module("socket.lp")
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-- default port
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PORT = 515
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SERVER = os.getenv("SERVER_NAME") or os.getenv("COMPUTERNAME") or "localhost"
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PRINTER = os.getenv("PRINTER") or "printer"
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local function connect(localhost, option)
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local host = option.host or SERVER
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local port = option.port or PORT
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local skt
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local try = socket.newtry(function() if skt then skt:close() end end)
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if option.localbind then
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-- bind to a local port (if we can)
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local localport = 721
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local done, err
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repeat
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skt = socket.try(socket.tcp())
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try(skt:settimeout(30))
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done, err = skt:bind(localhost, localport)
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if not done then
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localport = localport + 1
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skt:close()
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skt = nil
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else break end
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until localport > 731
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socket.try(skt, err)
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else skt = socket.try(socket.tcp()) end
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try(skt:connect(host, port))
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return { skt = skt, try = try }
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end
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--[[
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RFC 1179
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5.3 03 - Send queue state (short)
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+----+-------+----+------+----+
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| 03 | Queue | SP | List | LF |
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+----+-------+----+------+----+
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Command code - 3
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Operand 1 - Printer queue name
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Other operands - User names or job numbers
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If the user names or job numbers or both are supplied then only those
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jobs for those users or with those numbers will be sent.
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The response is an ASCII stream which describes the printer queue.
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The stream continues until the connection closes. Ends of lines are
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indicated with ASCII LF control characters. The lines may also
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contain ASCII HT control characters.
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5.4 04 - Send queue state (long)
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+----+-------+----+------+----+
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| 04 | Queue | SP | List | LF |
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+----+-------+----+------+----+
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Command code - 4
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Operand 1 - Printer queue name
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Other operands - User names or job numbers
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If the user names or job numbers or both are supplied then only those
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jobs for those users or with those numbers will be sent.
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The response is an ASCII stream which describes the printer queue.
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The stream continues until the connection closes. Ends of lines are
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indicated with ASCII LF control characters. The lines may also
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contain ASCII HT control characters.
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]]
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-- gets server acknowledement
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local function recv_ack(con)
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local ack = con.skt:receive(1)
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con.try(string.char(0) == ack, "failed to receive server acknowledgement")
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end
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-- sends client acknowledement
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local function send_ack(con)
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local sent = con.skt:send(string.char(0))
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con.try(sent == 1, "failed to send acknowledgement")
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end
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-- sends queue request
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-- 5.2 02 - Receive a printer job
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--
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-- +----+-------+----+
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-- | 02 | Queue | LF |
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-- +----+-------+----+
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-- Command code - 2
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-- Operand - Printer queue name
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--
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-- Receiving a job is controlled by a second level of commands. The
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-- daemon is given commands by sending them over the same connection.
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-- The commands are described in the next section (6).
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--
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-- After this command is sent, the client must read an acknowledgement
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-- octet from the daemon. A positive acknowledgement is an octet of
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-- zero bits. A negative acknowledgement is an octet of any other
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-- pattern.
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local function send_queue(con, queue)
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queue = queue or PRINTER
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local str = string.format("\2%s\10", queue)
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local sent = con.skt:send(str)
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con.try(sent == string.len(str), "failed to send print request")
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recv_ack(con)
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end
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-- sends control file
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-- 6.2 02 - Receive control file
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--
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-- +----+-------+----+------+----+
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-- | 02 | Count | SP | Name | LF |
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-- +----+-------+----+------+----+
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-- Command code - 2
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-- Operand 1 - Number of bytes in control file
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-- Operand 2 - Name of control file
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--
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-- The control file must be an ASCII stream with the ends of lines
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-- indicated by ASCII LF. The total number of bytes in the stream is
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-- sent as the first operand. The name of the control file is sent as
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-- the second. It should start with ASCII "cfA", followed by a three
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-- digit job number, followed by the host name which has constructed the
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-- control file. Acknowledgement processing must occur as usual after
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-- the command is sent.
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--
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-- The next "Operand 1" octets over the same TCP connection are the
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-- intended contents of the control file. Once all of the contents have
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-- been delivered, an octet of zero bits is sent as an indication that
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-- the file being sent is complete. A second level of acknowledgement
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-- processing must occur at this point.
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-- sends data file
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-- 6.3 03 - Receive data file
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--
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-- +----+-------+----+------+----+
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-- | 03 | Count | SP | Name | LF |
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-- +----+-------+----+------+----+
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-- Command code - 3
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-- Operand 1 - Number of bytes in data file
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-- Operand 2 - Name of data file
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--
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-- The data file may contain any 8 bit values at all. The total number
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-- of bytes in the stream may be sent as the first operand, otherwise
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-- the field should be cleared to 0. The name of the data file should
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-- start with ASCII "dfA". This should be followed by a three digit job
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-- number. The job number should be followed by the host name which has
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-- constructed the data file. Interpretation of the contents of the
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-- data file is determined by the contents of the corresponding control
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-- file. If a data file length has been specified, the next "Operand 1"
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-- octets over the same TCP connection are the intended contents of the
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-- data file. In this case, once all of the contents have been
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-- delivered, an octet of zero bits is sent as an indication that the
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-- file being sent is complete. A second level of acknowledgement
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-- processing must occur at this point.
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local function send_hdr(con, control)
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local sent = con.skt:send(control)
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con.try(sent and sent >= 1 , "failed to send header file")
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recv_ack(con)
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end
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local function send_control(con, control)
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local sent = con.skt:send(control)
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con.try(sent and sent >= 1, "failed to send control file")
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send_ack(con)
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end
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local function send_data(con,fh,size)
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local buf
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while size > 0 do
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buf,message = fh:read(8192)
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if buf then
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st = con.try(con.skt:send(buf))
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size = size - st
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else
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con.try(size == 0, "file size mismatch")
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end
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end
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recv_ack(con) -- note the double acknowledgement
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send_ack(con)
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recv_ack(con)
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return size
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end
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--[[
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local control_dflt = {
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"H"..string.sub(socket.hostname,1,31).."\10", -- host
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"C"..string.sub(socket.hostname,1,31).."\10", -- class
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"J"..string.sub(filename,1,99).."\10", -- jobname
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"L"..string.sub(user,1,31).."\10", -- print banner page
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"I"..tonumber(indent).."\10", -- indent column count ('f' only)
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"M"..string.sub(mail,1,128).."\10", -- mail when printed user@host
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"N"..string.sub(filename,1,131).."\10", -- name of source file
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"P"..string.sub(user,1,31).."\10", -- user name
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"T"..string.sub(title,1,79).."\10", -- title for banner ('p' only)
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"W"..tonumber(width or 132).."\10", -- width of print f,l,p only
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"f"..file.."\10", -- formatted print (remove control chars)
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"l"..file.."\10", -- print
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"o"..file.."\10", -- postscript
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"p"..file.."\10", -- pr format - requires T, L
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"r"..file.."\10", -- fortran format
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"U"..file.."\10", -- Unlink (data file only)
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}
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]]
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-- generate a varying job number
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local seq = 0
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local function newjob(connection)
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seq = seq + 1
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return math.floor(socket.gettime() * 1000 + seq)%1000
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end
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local format_codes = {
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binary = 'l',
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text = 'f',
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ps = 'o',
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pr = 'p',
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fortran = 'r',
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l = 'l',
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r = 'r',
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o = 'o',
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p = 'p',
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f = 'f'
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}
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-- lp.send{option}
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-- requires option.file
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send = socket.protect(function(option)
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socket.try(option and base.type(option) == "table", "invalid options")
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local file = option.file
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socket.try(file, "invalid file name")
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local fh = socket.try(io.open(file,"rb"))
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local datafile_size = fh:seek("end") -- get total size
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fh:seek("set") -- go back to start of file
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local localhost = socket.dns.gethostname() or os.getenv("COMPUTERNAME")
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or "localhost"
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local con = connect(localhost, option)
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-- format the control file
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local jobno = newjob()
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local localip = socket.dns.toip(localhost)
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localhost = string.sub(localhost,1,31)
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local user = string.sub(option.user or os.getenv("LPRUSER") or
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os.getenv("USERNAME") or os.getenv("USER") or "anonymous", 1,31)
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local lpfile = string.format("dfA%3.3d%-s", jobno, localhost);
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local fmt = format_codes[option.format] or 'l'
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local class = string.sub(option.class or localip or localhost,1,31)
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local _,_,ctlfn = string.find(file,".*[%/%\\](.*)")
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ctlfn = string.sub(ctlfn or file,1,131)
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local cfile =
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string.format("H%-s\nC%-s\nJ%-s\nP%-s\n%.1s%-s\nU%-s\nN%-s\n",
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localhost,
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class,
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option.job or "LuaSocket",
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user,
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fmt, lpfile,
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lpfile,
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ctlfn); -- mandatory part of ctl file
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if (option.banner) then cfile = cfile .. 'L'..user..'\10' end
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if (option.indent) then cfile = cfile .. 'I'..base.tonumber(option.indent)..'\10' end
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if (option.mail) then cfile = cfile .. 'M'..string.sub((option.mail),1,128)..'\10' end
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if (fmt == 'p' and option.title) then cfile = cfile .. 'T'..string.sub((option.title),1,79)..'\10' end
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if ((fmt == 'p' or fmt == 'l' or fmt == 'f') and option.width) then
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cfile = cfile .. 'W'..base.tonumber(option,width)..'\10'
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end
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con.skt:settimeout(option.timeout or 65)
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-- send the queue header
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send_queue(con, option.queue)
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-- send the control file header
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local cfilecmd = string.format("\2%d cfA%3.3d%-s\n",string.len(cfile), jobno, localhost);
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send_hdr(con,cfilecmd)
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-- send the control file
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send_control(con,cfile)
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-- send the data file header
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local dfilecmd = string.format("\3%d dfA%3.3d%-s\n",datafile_size, jobno, localhost);
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send_hdr(con,dfilecmd)
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-- send the data file
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send_data(con,fh,datafile_size)
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fh:close()
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con.skt:close();
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return jobno, datafile_size
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end)
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--
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-- lp.query({host=,queue=printer|'*', format='l'|'s', list=})
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--
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query = socket.protect(function(p)
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p = p or {}
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local localhost = socket.dns.gethostname() or os.getenv("COMPUTERNAME")
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or "localhost"
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local con = connect(localhost,p)
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local fmt
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if string.sub(p.format or 's',1,1) == 's' then fmt = 3 else fmt = 4 end
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con.try(con.skt:send(string.format("%c%s %s\n", fmt, p.queue or "*",
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p.list or "")))
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local data = con.try(con.skt:receive("*a"))
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con.skt:close()
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return data
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end)
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