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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/>.
--
local socket = require("socket")
local defines = require("defines")
local debug_shell = {}
debug_shell.properties = { input=true, output=true, max_instances=1, module_type_name="debug_shell" }
debug_shell.next_id = 0
function debug_shell:new(config)
local inst = {}
if(config.name == nil or config.name == "") then
inst.name = self.properties.module_type_name .. self.next_id
self.next_id = self.next_id + 1
else
inst.name = config.name
end
local ip, err = socket.dns.toip(config.host)
if(ip == nil) then
log.printf(log.ERROR, inst.name .. ": can't resolve %s: %s", config.host, err)
return nil
end
local server_sock_raw, err = socket.tcp()
if(server_sock_raw == nil) then
log.printf(log.ERROR, inst.name .. ": can't create tcp socket")
return nil
end
server_sock_raw:setoption('reuseaddr', true);
local ret, err = server_sock_raw:bind(ip, config.port)
if(ret == nil) then
log.printf(log.ERROR, inst.name .. ": bind(%s,%s) failed: %s", ip, config.port, err)
return nil
end
local ret, err = server_sock_raw:listen()
if(ret == nil) then
log.printf(log.ERROR, inst.name .. ": listen() failed: %s", err)
return nil
end
server_sock_raw:settimeout(0)
local server_sock = {}
server_sock.sock = server_sock_raw
function server_sock:getfd() return self.sock:getfd() end
function server_sock:dirty() return self.sock:dirty() end
function server_sock:read()
local client_sock_raw, err = self.sock:accept()
if(client_sock_raw == nil) then
log.printf(log.ERROR, inst.name .. ": accept() failed: %s", err)
end
local ip, port = client_sock_raw:getpeername();
log.printf(log.INFO, inst.name .. ": connection from %s:%s accepted", ip, port)
client_sock_raw:settimeout(0);
client_sock_raw:setoption('tcp-nodelay', true);
local client_sock = {}
client_sock.sock = client_sock_raw
function client_sock:getfd() return self.sock:getfd() end
function client_sock:dirty() return self.sock:dirty() end
client_sock.client_instance = nil
client_sock.in_buffer = ""
client_sock.out_buffer = ""
function client_sock:read()
local ret = 0
local data, err, partial = self.sock:receive('*l')
if(data == nil) then
if(err == 'closed') then
log.printf(log.INFO, inst.name .. ": connection closed by peer")
ret = defines.KILL_CLIENT
elseif(err == 'timeout') then
self.in_buffer = self.in_buffer .. partial
else
log.printf(log.INFO, inst.name .. ": connection error: %s", err)
ret = defines.KILL_CLIENT
end
else
self.in_buffer = self.in_buffer .. data
ret = debug_shell:exec_cmd(self)
if(ret == 1) then
ret = defines.KILL_CLIENT
end
self.in_buffer = ""
end
return ret
end
function client_sock:write()
self.sock:send(self.out_buffer)
self.out_buffer = ""
return defines.OK
end
local client = {}
client.module_instance = nil
client.sock = client_sock
function client:process_response(response)
self.sock.out_buffer = self.sock.out_buffer .. response
end
function client:process_timeout() end
function client:get_read_handles()
return { self.sock }
end
function client:get_write_handles()
if(self.sock.out_buffer ~= "") then
return { self.sock }
else
return {}
end
end
function client:cleanup()
self.sock.sock:close()
end
client_sock.client_instance = client
client.module_instance = inst
client_list:register(client)
return defines.OK
end
function server_sock:write() return defines.OK end
log.printf(log.WARNING, inst.name .. ": listening on %s:%s (this is a huge security risk)", ip, config.port);
function inst:cleanup()
log.printf(log.INFO, inst.name .. ": cleanup called");
client_list:unregister_by_module(self)
server_sock.sock:close()
end
function inst:get_read_handles()
return { server_sock }
end
function inst:get_write_handles()
return {}
end
setmetatable(inst, {})
getmetatable(inst).__gc = function() inst:cleanup() end
return inst
end
function debug_shell:exec_cmd(socket)
log.printf(log.DEBUG, "debug shell: received string: '%s'", socket.in_buffer)
local ret = defines.OK
local luacode = string.match(socket.in_buffer, "^!(.*)$");
if(luacode and luacode ~= "") then
local chunk = loadstring(luacode)
if(chunk) then
log.printf(log.DEBUG, "debug shell: calling lua command: '%s'", luacode)
local results = { pcall(chunk) }
if(results[1]) then
for i,result in ipairs(results) do
if(i > 1) then
socket.out_buffer = socket.out_buffer .. string.format("#%d: %s\n", i-1, tostring(result))
end
end
else
socket.out_buffer = socket.out_buffer .. string.format("lua call failed: %s\n", tostring(results[2]))
end
else
socket.out_buffer = socket.out_buffer .. "syntax error\n"
end
else
local cmd, sep, param = string.match(socket.in_buffer, "^(%w+)(.?)(.*)$");
if(cmd == 'quit') then
if(sep and sep ~= "") then socket.out_buffer = socket.out_buffer .. "unknown command\n" end
log.printf(log.INFO, "debug shell: quitting debug session")
ret = defines.KILL_CLIENT
elseif(cmd == 'terminate') then
if(sep and sep ~= "") then socket.out_buffer = socket.out_buffer .. "unknown command\n" end
log.printf(log.NOTICE, "debug shell: terminate command received")
ret = defines.KILL_DAEMON
elseif(cmd == 'help') then
if(sep and sep ~= "") then socket.out_buffer = socket.out_buffer .. "unknown command\n" end
socket.out_buffer = socket.out_buffer .. "!<lua code> execute lua code\n" ..
"quit quit this debug session\n" ..
"ping[ <data>] echo request (response will be 'pong[ <data>]')\n" ..
"terminate terminate the daemon\n"
elseif(cmd == 'ping') then
if(sep == ' ') then socket.out_buffer = socket.out_buffer .. "pong " .. (param or "") .. "\n"
else socket.out_buffer = socket.out_buffer .. "pong\n" end
else
socket.out_buffer = socket.out_buffer .. "unknown command\n"
end
end
return ret
end
return debug_shell
|
