BetterCap is an attempt to create a complete, modular, portable and easily extensible MITM framework with every kind of features could be needed while performing a man in the middle attack.
It’s currently able to sniff and print from the network the following informations:

• URLs being visited.
• HTTPS host being visited.
• HTTP POSTed data.
• FTP credentials.
• IRC credentials.
• POP, IMAP and SMTP credentials.
• NTLMv1/v2 ( HTTP, SMB, LDAP, etc ) credentials.

Examples:
Default sniffer mode, all parsers enabled:

sudo ruby bettercap.rb --proxy

Enable proxy and use a custom port:

sudo ruby bettercap.rb --proxy --proxy-port=8081

Enable proxy and load the module example_proxy_module.rb:

sudo ruby bettercap.rb --proxy --proxy-module=example_proxy_module.rb

Disable spoofer and enable proxy ( stand alone proxy mode ):

sudo ruby bettercap.rb -S NONE --proxy

Modules – You can easily implement a module to inject data into pages or just inspect the requests/responses creating a ruby file and passing it to bettercap with the –proxy-module argument, the following is a sample module that injects some contents into the title tag of each html page.

class HackTitle < Proxy::Module
    def initialize
        # do your initialization stuff here
    end
    # self explainatory
    def is_enabled?
        return true
    end
    def on_request request, response
        # is an html page?
        if response.content_type == "text/html"
            Logger.info "Hacking #{http://#{request.host}#{request.url}} title tag"
            # make sure to use sub! or gsub! to update the instance
            response.body.sub!( "