rspec/rules/S1313/kotlin/rule.adoc

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== Sensitive Code Example

----
val ip = "192.168.12.42"
val socket = ServerSocket(ip, 6667)
----

== Compliant Solution

[source,kotlin]
----
val ip = System.getenv("myapplication.ip")
val socket = ServerSocket(ip, 6667)
----

== Exceptions

No issue is reported for the following cases because they are not considered sensitive:

* Loopback addresses 127.0.0.0/8 in CIDR notation (from 127.0.0.0 to 127.255.255.255)
* Broadcast address 255.255.255.255
* Non-routable address 0.0.0.0
* Strings of the form ``++2.5.<number>.<number>++`` as they http://www.oid-info.com/introduction.htm[often match Object Identifiers] (OID)
* Addresses in the ranges 192.0.2.0/24, 198.51.100.0/24, 203.0.113.0/24, reserved for documentation purposes by https://datatracker.ietf.org/doc/html/rfc5737[RFC 5737]
* Addresses in the range 2001:db8::/32, reserved for documentation purposes by https://datatracker.ietf.org/doc/html/rfc3849[RFC 3849]
* Addresses from ::ffff:0:127.0.0.1 to ::ffff:0:127.255.255.255 and from ::ffff:127.0.0.1 to ::ffff:127.255.255.255, which are local IPv4-mapped IPv6 addresses

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== Implementation Specification
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== Comments And Links
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