this post was submitted on 15 Nov 2023
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[–] [email protected] 312 points 1 year ago (10 children)

Ok. This covers every ipv6 and ipv4 address.

"^\s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:)))(%.+)?\s*$"

[–] [email protected] 106 points 1 year ago

Lord have mercy

[–] [email protected] 83 points 1 year ago* (last edited 1 year ago) (1 children)

Please don't. Use regex to find something that looks like an IP then build a real parser. This is madness, its's extremely hard to read and a mistake is almost impossible to spot. Not to mention that it's slow.

Just parse [0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3} using regex (for v4) and then have some code check that all the octets are valid (and store the IP as a u32).

[–] [email protected] 11 points 1 year ago (8 children)

And dupe check. 0.0.0.0 and 000.000.000.000 may both be valid, but they resolve the same

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[–] [email protected] 51 points 1 year ago (5 children)

IPv6 was a mistake. We should have just added an addition octet

[–] [email protected] 75 points 1 year ago (5 children)

That would allow for like, 2 trillion devices? Feels like a bandaid, my dude. Next you’re gonna suggest a giant ice cube in the ocean once a year to stop global warming.

[–] [email protected] 13 points 1 year ago (1 children)

So add two more octets:

Moat companies will still just use something like 10.0.13.37.0.1

[–] [email protected] 11 points 1 year ago (5 children)

IPv6 is not made with internal networks in mind lol

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[–] [email protected] 9 points 1 year ago (2 children)
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[–] [email protected] 17 points 1 year ago (2 children)

Oh yeah, great, let's change the fundamental protocol on which all the networks in the world are based. Now two third of the devices in the world crashed because you tried to ping 192.168.0.0.1

[–] [email protected] 12 points 1 year ago

that WOULD be quite funny for the first second or 2....

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[–] [email protected] 37 points 1 year ago (1 children)
[–] Patches 19 points 1 year ago* (last edited 1 year ago) (1 children)

Made that joke in an interview once.

They didn't think it was funny. They truly thought Regex was the solution to, but never the cause of, all problems.

They wanted to make a Regex to verify every single address in the world. Dodged a bullet

[–] [email protected] 9 points 1 year ago* (last edited 1 year ago) (2 children)

Holy hell yeah you did. How would you go about doing that in a single expression? A bunch of back references to figure out the country? What if that's not included? Oy.

[–] Patches 15 points 1 year ago* (last edited 1 year ago) (2 children)

You wouldn't. It's not possible. Which is what I told them.

And why would you want to? Legally if you change the given address, and it fails to get delivered - that is on you. Not them.

Some countries have addresses that are literally 'Last house on the left by the Big Tree. Bumban(Neighborhood). NN (Country)'. Any US Centric validation would fail this but I assure you - mail gets delivered just fine.

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[–] [email protected] 31 points 1 year ago

It's always a treat to debug a regex of that size.

[–] [email protected] 29 points 1 year ago

I knew there would be someone with the regex.

[–] [email protected] 18 points 1 year ago* (last edited 1 year ago)

You're more of a perl programmer than network engineer :P

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[–] [email protected] 175 points 1 year ago (3 children)

0.0.0.0/0 0::0/0

You didn't specify it couldn't be in CIDR block notation...

[–] [email protected] 26 points 1 year ago
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[–] [email protected] 90 points 1 year ago (4 children)

0.0.0.0 /0 ::/0

SUCK MY DICK, GRU!

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[–] [email protected] 78 points 1 year ago* (last edited 1 year ago) (1 children)

:00 - :ff

Edit: Just learnt this can be also noted as:

:: - ::f

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[–] [email protected] 64 points 1 year ago (2 children)
[–] [email protected] 19 points 1 year ago (1 children)

Better hope the goon hasn't heard of IPv6 either, or you're toast

[–] [email protected] 21 points 1 year ago
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[–] [email protected] 62 points 1 year ago* (last edited 1 year ago)

This is gonna take a while...

0.0.0.0

0.0.0.1

0.0.0.2

0.0.0.3

...

[–] [email protected] 42 points 1 year ago* (last edited 1 year ago) (2 children)
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[–] [email protected] 40 points 1 year ago
[–] [email protected] 24 points 1 year ago* (last edited 1 year ago) (3 children)

This reminds me of something I saw online maybe 20 years ago now. Someone created a torrent with a name like "every IP address ever (hacking tool)" and uploaded it to Suprnova, which ended up having thousands of people seeding it. It was just a text file with every IPv4 from 0.0.0.0 to 255.255.255.255 😂

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[–] [email protected] 23 points 1 year ago

127.0.0.1, I'm an introvert

[–] [email protected] 23 points 1 year ago* (last edited 1 year ago) (2 children)

ipv4 [0,255].[0,255].[0,255].[0,255]

ipv6 [0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]

[–] [email protected] 14 points 1 year ago* (last edited 1 year ago) (1 children)

This excludes all the ipv4 ips that have a 0 in the 2nd, 3rd, and 4th octets. Sorry but we're going to have to revoke your Network Engineering credentials.

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[–] [email protected] 10 points 1 year ago (1 children)

Not to nitpick, but an IPv6 address is represented as eight groups of four hexadecimal digits separated by :. Like 2001:0db8:3333:4444:5555:6666:7777:8888.

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[–] [email protected] 22 points 1 year ago
[–] [email protected] 20 points 1 year ago (1 children)
[–] [email protected] 22 points 1 year ago

That's only 1 ip (single host)

[–] [email protected] 19 points 1 year ago (1 children)

one of them has a 7 I’m pretty sure

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[–] [email protected] 16 points 1 year ago (1 children)

1 and 0. Some assembly required.

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[–] [email protected] 15 points 1 year ago

I mean if I name them do I have to own the domain or…

[–] [email protected] 15 points 1 year ago
[–] [email protected] 12 points 1 year ago* (last edited 1 year ago)

0.0.0.0/0

::

[–] [email protected] 12 points 1 year ago* (last edited 1 year ago)

My PC's is now Bob, My router's Billy...

[–] [email protected] 11 points 1 year ago (4 children)

I'll start.

0.0.0.1: Sophie

Your turn.

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[–] [email protected] 10 points 1 year ago
[–] [email protected] 9 points 1 year ago (1 children)
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[–] [email protected] 7 points 1 year ago (1 children)
[–] [email protected] 8 points 1 year ago (1 children)
[–] [email protected] 11 points 1 year ago (1 children)

UDP

I'd love to tell you a joke about UDP but I'll never know if you get it.

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