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|
--
-- gcsd
--
-- gcsd the generic command sequencer daemon can be used to serialize
-- commands sent over various paralell communication channels to a
-- single command output. It can be seen as a multiplexer for any
-- kind of communication between a single resource and various clients
-- which want to submit commands to it or query information from it.
-- gcsd is written in C and Lua. The goal is to provide an easy to
-- understand high level API based on Lua which can be used to
-- implement the business logic of the so formed multiplexer daemon.
--
--
-- Copyright (C) 2009-2010 Markus Grueneis <gimpf@spreadspace.org>
-- Christian Pointner <equinox@spreadspace.org>
--
-- This file is part of gcsd.
--
-- gcsd is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- any later version.
--
-- gcsd is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with gcsd. If not, see <http://www.gnu.org/licenses/>.
--
-- debug shell module class
local debug_shell = {}
debug_shell.properties = { type=defines.MISC_MODULE, name="debug_shell", max_instances=-1 }
debug_shell.defaults = { host = "localhost", port = 9000 }
debug_shell.next_id = 0
-- create new instance of debug shell module class
function debug_shell:new(config, runtype)
local inst = {}
inst.class = self
inst.config = config
if(config.name == nil or config.name == "") then
inst.name = self.properties.name .. self.next_id
self.next_id = self.next_id + 1
else
inst.name = config.name
end
if(not config.host) then config.host = self.defaults.host end
if(not config.port) then config.port = self.defaults.port end
local lst, err = tcp.server(config.addr, config.port, config.resolv_type)
if(not lst) then
return nil
end
inst.listeners = lst
for _, l in ipairs(inst.listeners) do
log.printf(log.NOTICE, "%s: listening on %s (this is a huge security risk)", inst.name, tcp.endtostring(l.local_end))
function l:read()
local new_client, addr = tcp.accept(self.fd)
if(not new_client) then
log.printf(ERROR, "inst.name: %s", addr)
return defines.KILL_MODULE
end
local client_handle = {}
client_handle.fd = new_client
client_handle.client_instance = nil
client_handle.in_buffer = ""
client_handle.out_buffer = ""
function client_handle:read()
-- TODO: which size should we request??
local buffer, err = tcp.recv(self.fd, 100)
if(buffer == nil) then
log.printf(log.ERROR, inst.name .. ": connection error: %s", err)
return defines.KILL_CLIENT
end
if(#buffer == 0) then
log.printf(log.INFO, inst.name .. ": connection closed")
return defines.KILL_CLIENT
end
self.in_buffer = self.in_buffer .. buffer
return debug_shell:parse_cmd(self)
end
function client_handle:write()
local len, err = tcp.send(self.fd, self.out_buffer)
if(len == nil) then
log.printf(log.ERROR, inst.name .. ": connection error: %s", err)
ret = defines.KILL_CLIENT
else
self.out_buffer = string.sub(self.out_buffer, len+1)
end
return defines.OK
end
local client = {}
client.module_instance = inst
client.addr = addr
client.name = inst.name .. "#" .. tcp.endtostring(addr)
function client:process_response() end
function client:process_timeout() end
function client:get_read_handles()
return { client_handle }
end
function client:get_write_handles()
if(client_handle.out_buffer ~= "") then
return { client_handle }
else
return {}
end
end
function client:cleanup()
rawio.close(client_handle.fd)
end
client_handle.client_instance = client
client_list:register(client)
return defines.OK
end
function l:write() return defines.OK end
end
function inst:cleanup()
client_list:unregister_by_module(self)
for _, l in ipairs(self.listeners) do
rawio.close(l.fd);
end
end
function inst:get_read_handles()
return self.listeners
end
function inst:get_write_handles()
return {}
end
setmetatable(inst, {})
getmetatable(inst).__gc = function() inst:cleanup() end
return inst
end
function debug_shell:parse_cmd(handle)
local ret = defines.OK
local init = 1
repeat
local had_match = false
local cmd, delim = string.match(handle.in_buffer, "([^\n\r]*)(\r?\n)", init)
if cmd and delim then
ret = self:exec_cmd(handle, cmd)
had_match = true
init = init + string.len(cmd) + string.len(delim)
break
end
until (not had_match or ret ~= defines.OK)
handle.in_buffer = string.sub(handle.in_buffer, init + 1)
return ret
end
function debug_shell:exec_cmd(handle, buffer)
local client_name = handle.client_instance.name
log.printf(log.DEBUG, client_name .. ": received string: '%s'", buffer)
local ret = defines.OK
local luacode = string.match(buffer, "^!(.*)$");
if(luacode and luacode ~= "") then
local chunk = loadstring(luacode)
if(chunk) then
log.printf(log.DEBUG, client_name .. ": calling lua command: '%s'", luacode)
local results = { pcall(chunk) }
if(results[1]) then
for i,result in ipairs(results) do
if(i > 1) then
handle.out_buffer = handle.out_buffer .. string.format("#%d: %s\n", i-1, tostring(result))
end
end
else
handle.out_buffer = handle.out_buffer .. string.format("lua call failed: %s\n", tostring(results[2]))
end
else
handle.out_buffer = handle.out_buffer .. "syntax error\n"
end
else
local cmd, sep, param = string.match(buffer, "^(%w+)(.?)(.*)$");
if(cmd == 'quit') then
if(sep and sep ~= "") then handle.out_buffer = handle.out_buffer .. "unknown command\n" end
log.printf(log.INFO, client_name .. ": quitting debug session")
ret = defines.KILL_CLIENT
elseif(cmd == 'disable') then
if(sep and sep ~= "") then handle.out_buffer = handle.out_buffer .. "unknown command\n" end
log.printf(log.NOTICE, client_name .. ": disabling this debug shell instance and close all connections")
ret = defines.KILL_MODULE
elseif(cmd == 'disableall') then
if(sep and sep ~= "") then handle.out_buffer = handle.out_buffer .. "unknown command\n" end
log.printf(log.NOTICE, client_name .. ": disabling all debug shell instances and close all connections")
ret = defines.KILL_MODULE_CLASS
elseif(cmd == 'terminate') then
if(sep and sep ~= "") then handle.out_buffer = handle.out_buffer .. "unknown command\n" end
log.printf(log.NOTICE, client_name .. ": terminate command received")
ret = defines.KILL_DAEMON
elseif(cmd == 'help') then
if(sep and sep ~= "") then handle.out_buffer = handle.out_buffer .. "unknown command\n" end
handle.out_buffer = handle.out_buffer .. "!<lua code> execute lua code\n" ..
"cmd <cmd> add the command to the command queue\n" ..
"quit quit this debug session\n" ..
"ping[ <data>] echo request (response will be 'pong[ <data>]')\n" ..
"disable close this debug shell instance and close all connections\n" ..
"disableall close all debug shell instances and close all connections\n" ..
"terminate terminate the daemon\n"
elseif(cmd == 'ping') then
if(sep == ' ') then handle.out_buffer = handle.out_buffer .. "pong " .. (param or "") .. "\n"
else handle.out_buffer = handle.out_buffer .. "pong\n" end
elseif(cmd == 'cmd') then
if(not param or param == '') then handle.out_buffer = handle.out_buffer .. "Error: please specify a command\n"
else
handle.out_buffer = handle.out_buffer .. "enqueing command: " .. param .. "\n"
command_queue:enqueue(param, "ok\n", 2500)
end
else
handle.out_buffer = handle.out_buffer .. "unknown command\n"
end
end
return ret
end
return debug_shell
|
