94 lines
3.5 KiB
Plaintext
94 lines
3.5 KiB
Plaintext
# $Id$
|
|
|
|
This file contains some brief instructions on contributing to the
|
|
Metasploit Framework.
|
|
|
|
|
|
Code Style
|
|
==========
|
|
|
|
In order to maintain consistency and readability, we ask that you
|
|
adhere to the following style guidelines:
|
|
|
|
- Hard tabs, not spaces
|
|
- Try to keep your lines under 100 columns (assuming four-space tabs)
|
|
- do; end instead of {} for a block
|
|
|
|
|
|
Code No-Nos
|
|
===========
|
|
|
|
1. Don't print to standard output. Doing so means that users of
|
|
interfaces other than msfconsole, such as msfrpc and msfweb, won't see
|
|
your output. You can use print_line to accomplish the same thing as
|
|
puts.
|
|
|
|
2. Don't use "sleep". It has been known to cause issues with
|
|
multi-threaded programs on various platforms. Instead, we use
|
|
"select(nil, nil, nil, <time>)" throughout the framework. We have
|
|
found this works around the underlying issue.
|
|
|
|
3. Always use Rex sockets, not ruby sockets. This includes
|
|
third-party libraries such as Net::Http. There are several very good
|
|
reasons for this rule. First, the framework doesn't get notified on
|
|
the creation of ruby sockets and won't know how to clean them up in
|
|
case your module raises an exception without cleaning up after itself.
|
|
Secondly, non-Rex sockets do not know about routes and therefore can't
|
|
be used through a meterpreter tunnel. Lastly, regular sockets miss
|
|
out on msf's proxy and ssl features. Msf includes many protocols
|
|
already implemented with Rex and if the protocol you need is missing,
|
|
porting another library to use them is straight-forward. See our
|
|
Net::SSH modifications in lib/net/ssh/ for an example.
|
|
|
|
4. When opening an IO stream, always force binary with "b" mode (or
|
|
using IO#binmode). This not only helps keep Windows and non-Windows
|
|
runtime environments consistent with each other, but also guarantees
|
|
that files will be treated as ASCII-8BIT instead of UTF-8.
|
|
|
|
5. Don't use String#[] for a single character. This returns a Fixnum in
|
|
ruby 1.8 and a String in 1.9, so it's safer to use the following idiom:
|
|
str[idx,1]
|
|
which always returns a String. If you need the ASCII byte, unpack it like
|
|
so:
|
|
str[idx,1].unpack("C")
|
|
|
|
6. Whenever possible, avoid using '+' or '+=' to concatenate strings.
|
|
The '<<' operator is significantly faster. The difference will become
|
|
even more apparent when doing string manipulation in a loop. The
|
|
following table approximates the underlying implementation:
|
|
Ruby Pseudo-C
|
|
----------- ----------------
|
|
a = b + c a = malloc(b.len+c.len+1);
|
|
strcpy(a, b);
|
|
memcpy(a+b.len, c, c.len);
|
|
a[b.len + c.len] = '\0';
|
|
a = b a = b;
|
|
a << c a = realloc(a, a.len+c.len+1);
|
|
memcpy(a+a.len, c, c.len);
|
|
a[a.len + c.len] = '\0';
|
|
Note that the original value of 'b' is lost in the second case. Care
|
|
must be taken to duplicate strings that you do not want to modify.
|
|
|
|
|
|
Creating New Modules
|
|
====================
|
|
|
|
When creating a new module, the simplest way to start is to copy
|
|
another module that uses the same protocol and modify it to your
|
|
needs. If you're creating an exploit module, generally you'll want
|
|
to edit the exploit() method. Auxiliary Scanner modules use one of
|
|
run_host(), run_range(), or run_batch() instead of exploit().
|
|
Non-scanner aux modules use run().
|
|
|
|
|
|
Licensing
|
|
=========
|
|
By submitting code contributions to the Metasploit Project it is
|
|
assumed that you are offering your code under a BSD or similar
|
|
license. MIT and Ruby Licenses are also fine. We specifically cannot
|
|
include GPL code.
|
|
|
|
When possible, such as aux and exploit modules, be sure to include
|
|
your license designation in the file in the appropriate place.
|
|
|