Welcome to the IPv4 Games

maverwa 286 days ago | | |

my first guess would be: server honors X-Forwarded-For where it should not?

Edit: looks like thats it: https://github.com/jart/cosmopolitan/blob/master/net/turfwar...

So basically someone is running a script iterates over the whole ipv4 range and calls the claim endpoint with each single adress in the X-Forwared-For http header once.

3r7j6qzi9jvnve 286 days ago | | |

That only works if the proxy is sitting on localhost or a local network, just setting the header shouldn't work.

(I came here because I was curious how jart got 127 and 10, but after seeing the source is their's that's less of wonder..)

sgjohnson 286 days ago | | |

bool IsPrivateIp(uint32_t x) {

  return (x >> 24) == 10                   /* 10.0.0.0/8  */

         || (x & 0xfff00000) == 0xac100000 /* 172.16.0.0/12  */

         || (x & 0xffff0000) == 0xc0a80000 /* 192.168.0.0/16  */;

}

the code doesn't consider 127.0.0.0/8 as "private". I'm curious about 10.0.0.0/8 though.*

viraptor 286 days ago | | |

The line just under that prevents public IPs from using that function.

maverwa 286 days ago | | |

you are right, I totally read that wrong. Confirmation bias strikes again!

elitepleb 286 days ago | | |

a simple proof of the opposite is that no one's yet to exploit any of the untaken ranges that way

nilsherzig 286 days ago | | |

Embedding images on a popular page?

But according to the servers status at http://35.223.193.241:443/statusz nearly all claim requests expected to get html back not images.

gruez 286 days ago | | |

There's plenty of ways around that, for instance

    <script src="https://ipv4.games/claim?name=gruez">

or

    <iframe src="https://ipv4.games/claim?name=gruez">

justusthane 286 days ago | | |

I don't know, but check out the "Recent Successful Claims" on the right.

Edit: Apparently they run https://novo.tf/, a CAPTCHA service, so they're probably using that to call out to ipv4.games from their clients.

viraptor 286 days ago | | |

There are VPNs which use residential endpoints. You essentially use other users' IPs there.

bombcar 286 days ago | | |

They’re top of the list, so at least some is seeing that and choosing to add to it.

adzm 286 days ago | | |

I wouldn't be surprised if they had it call out from guns.lol or something

maldonad0 286 days ago | | |

Maybe spoofing source IPs.

sgjohnson 286 days ago | | |

can't spoof the source IP in TCP communication, as the handshake cannot happen.

With UDP you can send whatever, but obviously you won't be able to receive the response.

Sesse__ 286 days ago | | |

It used to be possible back in the days when sequence numbers were easily guessable. (You'd obviously not be able to receive, only send, so you couldn't do TLS, but TLS had hardly been invented at the time.) Now operating systems are way too good for that. :-)

cedws 286 days ago | | |

Botnet maybe.

sgjohnson 286 days ago | | |

_nobody_ would waste a botnet of 9 million unique IPs like this.

usui 286 days ago | | |

Well let's not get hasty... These are valuable internet points we're talking about here.

nilsherzig 286 days ago | | |

Not if it's your own, but this would be a great opportunity to redirect a botnet hitting your severs to generate some internet points instead

nicman23 285 days ago | | |

it would be pretty funi though