Fix IPv4 boundary checking

[fufuok]

"255.255.255.255" is correct for IPv4.

Summary by CodeRabbit

• Bug Fixes
  • Improved the accuracy of IPv4 address validation.
• Tests
  • Added a test case to ensure invalid IPv4 addresses are correctly identified.

[coderabbitai]

Walkthrough

The recent update focuses on refining the validation logic for IPv4 addresses. Specifically, it corrects the condition that determines if a given number exceeds the maximum allowable value for an IPv4 segment. Additionally, a new test case has been introduced to ensure the updated logic accurately identifies an invalid IPv4 address, enhancing the reliability of the address validation process.

Changes

File	Change Summary
ips.go	Updated the IsIPv4 function to correctly validate IPv4 ranges.
ips_test.go	Added a test for an invalid IPv4 address "255.255.255.256".

🐇✨
In the code where bits and bytes play,
A tiny change makes a big sway.
"Fix a check, add a test," they say,
To keep the wrong addresses at bay.
Hop, hop, hurray! 🎉
🐇✨

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[coderabbitai]

Review Status

Actionable comments generated: 0

Configuration used: CodeRabbit UI

Commits

Files that changed from the base of the PR and between dbfbf0b and 7ca5fab.

Files selected for processing (2)

• ips.go (1 hunks)
• ips_test.go (2 hunks)

Additional comments: 2

ips.go (1)

• 24-24: The change from n >= 0xFF to n > 0xFF correctly fixes the boundary checking logic for IPv4 addresses, allowing 255 as a valid octet value. This is a crucial fix for accurately validating IPv4 addresses.

ips_test.go (1)

• 34-34: The addition of the test case to check for the invalid IPv4 address "255.255.255.256" is crucial for validating the fix in the IsIPv4 function. It ensures that the boundary checking logic correctly identifies values just beyond the valid range as invalid.

[gaby]

LGTM