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It s also important to treat value objects as immutable Don t allow them to be changed after creation Instead, create a new object instance with the new value instead Active Record will not persist value objects that have been changed through means other than the writer method The immutable requirement is enforced by Active Record by freezing any object assigned as a value object Attempting to change it afterwards will result in a ActiveSupport::FrozenObjectError

When a composite is deployed to a domain with more than one runtime, its components may be hosted on different runtimes For example, when the previous loan application composite is deployed, LoanComponent and CreditComponent may be hosted in processes on different runtimes (see Figure 18) The process of deploying a composite to one runtime or many is vendor-speci c Some SCA runtimes may require additional con guration information identifying target machines Other runtimes may employ sophisticated provisioning algorithms that take into account factors such as machine load

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By default value objects are initialized by calling the new constructor of the value class with each of the mapped attributes, in the order specified by the :mapping option, as arguments If for some reason your value class does not work well with that convention, composed_of allows a custom constructor to be specified When a new value object is assigned to its parent, the default assumption is that the new value is an instance of the value class Specifying a custom converter allows the new value to be automatically converted to an instance of value class (when needed) For example, consider the NetworkResource model with network_address and cidr_range attributes that should be contained in a NetAddr::CIDR value class11 The constructor for the value class is called create and it expects a CIDR address string as a parameter New values can be assigned to the value object using either another NetAddr::CIDR object, a string or an array The :constructor and :converter options are used to meet the requirements:

Format Strings Format string errors occur when user input is allowed to in uence the format string argument to certain string formatting functions In this section, we give a brief background on format string vulnerabilities and outline the ways they often occur In the sidebar at the end of the section, we walk through a typical format string exploit to demonstrate how attackers take advantage of these vulnerabilities To give you a preview, we begin with a real-world example The code in Example 630 contains a classic format string vulnerability from the popular FTP daemon wuftpd (which has suffered from numerous vulnerabilities)

class NetworkResource < ActiveRecord::Base composed_of :cidr, :class_name => 'NetAddr::CIDR', :mapping => [ %w(network_address network), %w(cidr_range bits) ], :allow_nil => true,

:constructor => Procnew { |network_address, cidr_range| NetAddr::CIDRcreate("#{network_address}/#{cidr_range}") }, :converter => Procnew { |value| NetAddr::CIDRcreate(valueis_a (Array) valuejoin('/') : value) } end # This calls the :constructor network_resource = NetworkResourcenew(:network_address => '19216801', :cidr_range => 24) # These assignments will both use the :converter network_resourcecidr = [ '19216821', 8 ] network_resourcecidr = '19216801/24' # This assignment won't use the :converter as the value is already an instance of the value class network_resourcecidr = NetAddr::CIDRcreate('19216821/8') # Saving and then reloading will use the :constructor on reload network_resourcesave network_resourcereload

One of the program s best-known format string vulnerabilities was found in the way the lreply() function is invoked in Version 260, which, in a simpli ed form, looks like the code in Example 630 In the vulnerable code, a string is read from a network socket and passed without validation as the format string argument to the function vsnprintf() By supplying specially crafted command to the server, an attacker can remotely exploit this vulnerability to gain root privileges on the machine

Note that Active Record already has a ton of built-in functionality abstracting SELECT statements Functionality that it would be very unwise to reinvent There are lots of cases where at first glance it might seem that you might need to use find_by_sql, but you actually don t A common case is when doing a LIKE query:

Although the capabilities offered by a domain will vary greatly by SCA vendor (or open source implementation), all domains have several common characteristics Namely, domains provide management capabilities, policy framework, resource-sharing facilities, and communications infrastructure

>> Clientfind_by_sql("select * from clients where code like 'A%'") => [#<Client id: 1, name: "Amazon, Inc" >]

Turns out that you can easily put that LIKE clause into a conditions option:

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