I'm following the Lua part of this tutorial: http://wiki.dragino.com/index.php?title=Save_Data_to_MySQL.
Especially this code:
require "luasql.mysql"
env = assert (luasql.mysql())
con = assert (env:connect"nkt_development",'db_user','db_passwordL','172.31.10.60',3306)
Unfortunately I got an error that I can't fix
lua: mysql_test.lua:7: attempt to index global 'luasql' (a nil value)
stack traceback:
mysql_test.lua:7: in main chunk
[C]: ?
I am working on an dragino gatway / Arduino Yun.
I found the answer myself by typing the following into the first line. Instead of just requiring the libary I had to declare it onto a variable to use later in the code.
luasql = require "luasql.mysql"
This is what my final code looks like:
luasql = require "luasql.mysql"
value=arg[1]
current_time=os.date("%Y-%m-%d %H:%M:%S")
env = luasql.mysql()
con = assert (env:connect('development', 'DBUSER', 'PASSWORD', 'HOSTIP','3306'))
res = assert (con:execute('INSERT INTO record(time,value) VALUES("'..current_time..'",'..value..')'))
Related
I'm new to RE. I'm trying to solve a HackTheBox challenge called RAuth, with angr. I understand how to analyze and solve this challenge differently, without angr, but I really want to understand what is wrong with my angr script, or maybe what is the reason why angr is not feasible for this (and similar) case?
The application is easy, after it starts it's requesting the password from stdin, and exits if the password is incorrect:
>:~/challenges/rauth$ ./rauth
Welcome to secure login portal!
Enter the password to access the system:
wqeqwwqewqewqeqwewqeqweqweqweqweqwewqeqwe
You entered a wrong password!
When I run my script it works for around 15 minutes and dies with one of two errors:
"Killed"
"IndexError: tuple index out of range"
My angr script:
#!/usr/bin/env python
#coding: utf-8
import angr
import claripy
import time
import sys
def is_successful(st):
output = st.posix.dumps(sys.stdout.fileno())
if b'Successfully Authenticated' in output:
return True
return False
def should_abort(state):
output = state.posix.dumps(sys.stdout.fileno())
return b'You entered a wrong password!' in output
def main(round):
print("Checking "+str(round))
p = angr.Project('rauth',auto_load_libs=False)
flag_chars = [claripy.BVS('flag_%d' % i, 8) for i in range(round)]
flag = claripy.Concat(*flag_chars + [claripy.BVV(b'\n')])
st = p.factory.full_init_state(
args=['./rauth'],
add_options=angr.options.unicorn,
stdin=angr.SimPackets(name='stdin', content=[(flag, 32)])
#stdin=flag,
)
st.options.add(angr.options.SYMBOL_FILL_UNCONSTRAINED_MEMORY)
st.options.add(angr.options.SYMBOL_FILL_UNCONSTRAINED_REGISTERS)
for k in flag_chars:
st.solver.add(k >= ord(" "))
st.solver.add(k <= ord("~"))
sm = p.factory.simulation_manager(st)
#sm.explore(find=is_successful,avoid=should_abort)
sm.explore(find=lambda s: b"Successfully" in s.posix.dumps(1),avoid=lambda s: b"wrong" in s.posix.dumps(1))
if len(sm.found) > 0:
for solution_state in ex.found:
print("[>>] {!r}".format(solution_state.solver.eval(flag,cast_to=bytes)))
else:
print("[>>] no solution found :(")
if __name__ == "__main__":
print(main(32))
Am I using angr for the case when it's not applicable? What am I missing?
A also tried to play with options, like removing unicorn, enabling auto_load_libs, using or disabling lambdas etc. No success.
spark_write_jdbc(members_df,
name = "Mbrs",
options = list(
url = paste0("jdbc:mysql://",mysql_host,":",mysql_port,"/",dbname),
user = mysql_user,
password = mysql_password),
mode = "append")
Results in the following exception:
Error: java.sql.SQLException: No suitable driver
at java.sql.DriverManager.getDriver(DriverManager.java:315)
The .jar file is in a folder on the server where RStudio is running, config details below. We're able to access MySql via the RMySql package so MySql is working and accessible.
config$`spark.sparklyr.shell.driver-class-path` <- "/dev/shm/temp/mysql-connector-java-5.1.44-bin.jar"
Even if the question is different, I think the answer still applies also to this:
How to use a predicate while reading from JDBC connection?
Code to connect to JDBC MySQL through sparklyr (I made some slight changes to simplify the code a bit, written by Jake Russ)
library(sparklyr)
library(dplyr)
config <- spark_config()
#config$`sparklyr.shell.driver-class-path` <- "E:\\spark232_hadoop27\\jars\\mysql-connector-java-5.1.47-bin.jar"
#in my case, using RStudio and Sparkly this seemed to be optional
sc <- spark_connect(master = "local")
db_tbl <- spark_read_jdbc(sc,
name = "table_name",
options = list(url = "jdbc:mysql://localhost:3306/schema_name",
user = "root",
password = "password",
dbtable = "table_name"))
I'm trying to encode/decode JSON in Lua using CJSON. I downloaded lua-cjson using Luarocks (http://www.kyne.com.au/~mark/software/lua-cjson-manual.html).
In the Lua interpreter, I'm using an example from the cjson manual:
> local cjson = require "cjson"
> value = { true, { foo = "bar" } }
> json_text = cjson.encode(value)
stdin:1: attempt to index a nil value (global 'cjson')
stack traceback:
stdin:1: in main chunk
[C]: in ?
I know that cjson is being found, because if I were to do ' require "foobar" ', Lua would error. It's just not able to use the module. Any help would be appreciated.
Each line in an interactive session is a separate chunk. So, the local variable created in line 1 no longer exists in the next lines. Note how the error message mentions a global variable. Try removing local.
I am trying to connect to a mysql server using LuaSql via a mysql proxy. I try to execute a simple program (db.lua):
require("luasql.mysql")
local _sqlEnv = assert(luasql.mysql())
local _con = nil
function read_auth(auth)
local host, port = string.match(proxy.backends[1].address, "(.*):(.*)")
_con = assert(_sqlEnv:connect( "db_name", "username", "password", "hostname", "3306"))
end
function disconnect_client()
assert(_con:close())
end
function read_query(packet)
local cur = con:execute("select * from t1")
myTable = {}
row = cur:fetch(myTable, "a")
print(myTable.id,myTable.user)
end
This code executes well when I execute it without mysql-proxy. When I am connecting with mysql-proxy, the error-log displays these errors:
mysql.lua:8: bad argument #1 to 'insert' (table expected, got nil)
db.lua:1: loop or previous error loading module 'luasql.mysql'
mysql.lua is a default file of LuaSql:
---------------------------------------------------------------------
-- MySQL specific tests and configurations.
-- $Id: mysql.lua,v 1.4 2006/01/25 20:28:30 tomas Exp $
---------------------------------------------------------------------
QUERYING_STRING_TYPE_NAME = "binary(65535)"
table.insert (CUR_METHODS, "numrows")
table.insert (EXTENSIONS, numrows)
---------------------------------------------------------------------
-- Build SQL command to create the test table.
---------------------------------------------------------------------
local _define_table = define_table
function define_table (n)
return _define_table(n) .. " TYPE = InnoDB;"
end
---------------------------------------------------------------------
-- MySQL versions 4.0.x do not implement rollback.
---------------------------------------------------------------------
local _rollback = rollback
function rollback ()
if luasql._MYSQLVERSION and string.sub(luasql._MYSQLVERSION, 1, 3) == "4.0" then
io.write("skipping rollback test (mysql version 4.0.x)")
return
else
_rollback ()
end
end
As stated in my previous comment, the error indicates that table.insert (CUR_METHODS, ...) is getting a nil as first arg. Since the first arg is CUR_METHODS, it means that this object CUR_METHODS has not been defined yet. Since this happens near top of the luasql.mysql module, my guess is that the luasql initialization was incomplete, maybe because the mysql DLL was not found. My guess is that the LUA_CPATH does not find the MySQL DLL for luasql, but I'm surprised that you wouldn't get a package error, so something odd is going on. You'll have to dig into the luasql module and C file to figure out why it is not being created.
Update: alternately, update your post to show the output of print("LUA path:", package.path) and print("LUA path:", package.cpath) from your mysql-proxy script and also show the path of folder where luasql is installed and contents of that folder.
How can I connect to a MySQL database from using Lua programming language?
If a good/popular library exists, what is it?
Minimal woking example for LuaSQL - simple interface from Lua to a DBMS.
package.cpath = package.cpath .. ";/usr/lib/i386-linux-gnu/lua/5.1/?.so"
luasql = require "luasql.mysql"
env = assert (luasql.mysql())
con = assert (env:connect("dbname","user","password"))
cur = assert (con:execute("SHOW TABLES"))
row = cur:fetch ({}, "a")
while row do
print(string.format("Name: %s", row.Tables_in_dbname))
row = cur:fetch (row, "a")
end
Line 1 used if module luasql.mysql not found. Also environment variable LUA_CPATH may be used.
In case your mysql database is remote, you can add host as another optional parameter to connect. Port can follow host as well:
con = assert (env:connect("dbname","user","password","host",port))
From LuaSQL -- Database connectivity for the Lua programming language:
require "luasql.mysql"
env = assert (luasql.mysql())
con = assert (env:connect"my_db")
for id, name, address in rows (con, "select * from contacts") do
print (string.format ("%s: %s", name, address))
end