flm01/openwrt/packages/luci/libs/lucittpd/luasrc/ttpd/server.lua

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--[[
LuCIttpd
(c) 2008 Steven Barth <steven@midlink.org>
(c) 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
$Id$
]]--
local ipairs, pairs = ipairs, pairs
local tostring, tonumber = tostring, tonumber
local pcall, assert = pcall, assert
local os = require "os"
local io = require "io"
local uci = require "luci.model.uci"
local util = require "luci.util"
local ltn12 = require "luci.ltn12"
local proto = require "luci.http.protocol"
local string = require "string"
local date = require "luci.http.protocol.date"
module "luci.ttpd.server"
BUFSIZE = 4096
VERSION = 0.91
-- File Resource
IOResource = util.class()
function IOResource.__init__(self, fd, offset, len)
self.fd, self.offset, self.len = fd, offset, len
end
VHost = util.class()
function VHost.__init__(self, handler)
self.handler = handler
self.dhandler = {}
end
function VHost.process(self, request, sourcein, sinkerr, ...)
local handler = self.handler
local uri = request.env.REQUEST_URI:match("^([^?]*)")
-- SCRIPT_NAME
request.env.SCRIPT_NAME = ""
-- Call URI part
request.env.PATH_INFO = uri
for k, dhandler in pairs(self.dhandler) do
if k == uri or k.."/" == uri:sub(1, #k+1) then
handler = dhandler
request.env.SCRIPT_NAME = k
request.env.PATH_INFO = uri:sub(#k+1)
break;
end
end
if handler then
return handler:process(request, sourcein, sinkerr, ...)
end
end
function VHost.get_default_handler(self)
return self.handler
end
function VHost.set_default_handler(self, handler)
self.handler = handler
end
function VHost.get_handlers(self)
return self.dhandler
end
function VHost.set_handler(self, match, handler)
self.dhandler[match] = handler
end
Server = util.class()
function Server.__init__(self, host)
self.uci = uci.cursor()
self.host = host
self.vhosts = {}
self.rbuf = ""
self.wbuf = ""
end
function Server.get_default_vhost(self)
return self.host
end
function Server.set_default_vhost(self, vhost)
self.host = vhost
end
function Server.get_vhosts(self)
return self.vhosts
end
function Server.set_vhost(self, name, vhost)
self.vhosts[name] = vhost
end
function Server.flush(self)
if #self.wbuf > 0 then
self._write(self.wbuf)
self.wbuf = ""
end
end
function Server.read(self, len)
while #self.rbuf < len do
self.rbuf = self.rbuf .. self._read(len - #self.rbuf)
end
local chunk = self.rbuf:sub(1, len)
self.rbuf = self.rbuf:sub(len + 1)
return chunk
end
function Server.limitsource(self, limit)
limit = limit or 0
return function()
if limit < 1 then
return nil
else
local read = (limit > BUFSIZE) and BUFSIZE or limit
limit = limit - read
return self:read(read)
end
end
end
-- Adapted from Luaposix
function Server.receiveheaders(self)
local line, name, value, err
local headers = {}
-- get first line
line, err = self:readline()
if err then return nil, err end
-- headers go until a blank line is found
while line do
-- get field-name and value
_, _, name, value = line:find("^(.-):%s*(.*)")
if not (name and value) then return nil, "malformed reponse headers" end
name = name:lower()
-- get next line (value might be folded)
line, err = self:readline()
if err then return nil, err end
-- unfold any folded values
while line:find("^%s") do
value = value .. line
line = self:readline()
if err then return nil, err end
end
-- save pair in table
if headers[name] then headers[name] = headers[name] .. ", " .. value
else headers[name] = value end
end
return headers
end
function Server.readchunk(self)
-- get chunk size, skip extention
local line, err = self:readline()
if err then return nil, err end
local size = tonumber(line:gsub(";.*", ""), 16)
if not size then return nil, "invalid chunk size" end
-- was it the last chunk?
if size > 0 then
-- if not, get chunk and skip terminating CRLF
local chunk, err, part = self:read(size)
if chunk then self:readline() end
return chunk, err
else
-- if it was, read trailers into headers table
headers, err = self:receiveheaders()
if not headers then return nil, err end
end
end
function Server.readline(self)
if #self.rbuf < 1 then
self.rbuf = self._read(BUFSIZE)
end
while true do
local le = self.rbuf:find("\r\n", nil, true)
if le then
if le == 1 then -- EoH
self.rbuf = self.rbuf:sub(le + 2)
return nil
else -- Header
local line = self.rbuf:sub(1, le - 1)
self.rbuf = self.rbuf:sub(le + 2)
return line
end
else
if #self.rbuf >= BUFSIZE then
return nil, "Invalid Request"
end
self.rbuf = self.rbuf .. self._read(BUFSIZE-#self.rbuf)
end
end
end
function Server.sink(self)
return function(chunk, err)
if err then
return nil, err
elseif chunk then
local stat, err = pcall(self.write, self, chunk)
if stat then
return stat
else
return nil, err
end
else
return true
end
end
end
function Server.chunksink(self)
return function(chunk, err)
local stat, err = pcall(self.writechunk, self, chunk)
if stat then
return stat
else
return nil, err
end
end
end
function Server.writechunk(self, chunk, err)
self:flush()
if not chunk then return self._write("0\r\n\r\n") end
local size = string.format("%X\r\n", #chunk)
return self._write(size .. chunk .. "\r\n")
end
function Server.write(self, chunk)
while #chunk > 0 do
local missing = BUFSIZE - #self.wbuf
self.wbuf = self.wbuf .. chunk:sub(1, missing)
chunk = chunk:sub(missing + 1)
if #self.wbuf == BUFSIZE then
assert(self._write(self.wbuf))
self.wbuf = ""
end
end
end
function Server.close(self)
self:flush()
self._close()
end
function Server.sendfile(self, fd, offset, len)
self:flush()
self._sendfile(fd, offset, len)
end
function Server.error(self, code, msg)
hcode = tostring(code)
self:write( "HTTP/1.0 " .. hcode .. " " ..
proto.statusmsg[code] .. "\r\n" )
self:write( "Connection: close\r\n" )
self:write( "Content-Type: text/plain\r\n\r\n" )
if msg then
self:write( "HTTP-Error " .. code .. ": " .. msg .. "\r\n" )
end
end
function Server.process(self, functions)
util.update(self, functions)
local sourcein = ltn12.source.empty()
local sourcehdr = function() return self:readline() or "" end
local sinkerr = ltn12.sink.file( io.stderr )
local sinkout = self:sink()
local close = false
local stat, message, err
repeat
-- parse headers
stat, message, err = pcall(proto.parse_message_header, sourcehdr)
-- remote socket closed
if not stat and message == 0 then
break
end
-- remote timeout
if not stat and message == 11 then
--self:error(408)
break
end
-- any other error
if not stat or not message then
self:error(400, err)
break
end
-- keep-alive
if message.http_version == 1.1 then
close = (message.env.HTTP_CONNECTION == "close")
else
close = not message.env.HTTP_CONNECTION or message.env.HTTP_CONNECTION == "close"
end
-- Uncomment this to disable keep-alive
close = not (self.uci:get("lucittpd", "lucittpd", "keepalive") == "1")
if message.request_method == "get" or message.request_method == "head" then
-- Be happy
elseif message.request_method == "post" then
-- If we have a HTTP/1.1 client and an Expect: 100-continue header then
-- respond with HTTP 100 Continue message
if message.http_version == 1.1 and message.headers['Expect'] and
message.headers['Expect'] == '100-continue'
then
self:write("HTTP/1.1 100 Continue\r\n\r\n")
end
if message.headers['Transfer-Encoding'] and
message.headers['Transfer-Encoding'] ~= "identity" then
sourcein = function() return self:readchunk() end
elseif message.env.CONTENT_LENGTH then
sourcein = self:limitsource(
tonumber(message.env.CONTENT_LENGTH)
)
else
self:error( 411, proto.statusmsg[411] )
break
end
else
self:error( 405, proto.statusmsg[405] )
break
end
local host = self.vhosts[message.env.HTTP_HOST] or self.host
if not host then
self:error( 500, "Unable to find matching host" )
break;
end
local response, sourceout = host:process(
message, sourcein, sinkerr,
client, io.stderr
)
if not response then
self:error( 500, "Error processing handler" )
end
-- Post process response
if sourceout then
if util.instanceof(sourceout, IOResource) then
if not response.headers["Content-Length"] then
response.headers["Content-Length"] = sourceout.len
end
end
if not response.headers["Content-Length"] then
if message.http_version == 1.1 then
response.headers["Transfer-Encoding"] = "chunked"
sinkout = self:chunksink()
else
close = true
end
end
elseif message.request_method ~= "head" then
response.headers["Content-Length"] = 0
end
if close then
response.headers["Connection"] = "close"
end
response.headers["Date"] = date.to_http(os.time())
local header =
message.env.SERVER_PROTOCOL .. " " ..
tostring(response.status) .. " " ..
proto.statusmsg[response.status] .. "\r\n"
header = header .. "Server: LuCIttpd/" .. tostring(VERSION) .. "\r\n"
for k,v in pairs(response.headers) do
header = header .. k .. ": " .. v .. "\r\n"
end
-- Output
local stat, err = pcall(function()
self:write(header .. "\r\n")
if sourceout then
if util.instanceof(sourceout, IOResource) then
self:sendfile(sourceout.fd, sourceout.offset, sourceout.len)
else
ltn12.pump.all(sourceout, sinkout)
end
end
self:flush()
end)
-- Write errors
if not stat then
if err == 107 then
-- Remote end closed the socket, so do we
elseif err then
io.stderr:write("Error sending data: " .. err .. "\n")
end
break
end
until close
self:close()
end