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fix: Update RFC1123 Hostname Check (#7572)

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* Update RFC1123 Hostname Check

The regex was wrong. It failed to match devices like `cisco-3750x` even though it is a valid hostname. 
I picked this regex from the RFC1123 documentation, and updated it.

* Update CommonFunctionsTest.php

Update tests

* Updated to allow domains ending with a dot
This commit is contained in:
Parth Laxmikant Kolekar
2017-10-29 15:42:32 +05:30
committed by Daniel Preussker
parent 6fab5166c5
commit ebcfa45a93
2 changed files with 7 additions and 2 deletions
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4
includes/common.php
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@@ -629,9 +629,9 @@ function is_valid_hostname($hostname)
// maximum length is 253 characters, maximum segment size is 63
return (
preg_match("/^([a-z\d](-*[a-z\d])*)(\.([a-z\d](-*[a-z\d])*))*\.?$/i", $hostname) //valid chars check
preg_match("/^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])\.?$/", $hostname) //valid chars check
&& preg_match("/^.{1,253}$/", $hostname) //overall length check
&& preg_match("/^[^\.]{1,63}(\.[^\.]{1,63})*\.?$/", $hostname)
&& preg_match("/^[^\.]{1,63}(\.[^\.]{1,63})*\.?$/", $hostname) //segment length check
);
}