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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Liz Fong-Jones‏ @lizthegrey May 12

      So you can use it to debug, but you can use it for other purposes too like getting to print a star wars banner line by line, crawling like the Star Wars banner. #bangbangcon

      1 reply 0 retweets 2 likes
      Show this thread
    2. Liz Fong-Jones‏ @lizthegrey May 12

      How can you do this without commercial grade routing equipment? we need to understand how routing works first. [ed: it's @tetrakazi speaking -- got it from another livetweeter] #bangbangcon

      2 replies 0 retweets 0 likes
      Show this thread
    3. Liz Fong-Jones‏ @lizthegrey May 12

      We don't know how to get to each exact place, but we know how to get closer. We ask a friendly stranger at each step to get closer and closer to our destination address. #bangbangcon

      1 reply 0 retweets 0 likes
      Show this thread
    4. Liz Fong-Jones‏ @lizthegrey May 12

      It all works fine as long as there aren't loops. We can run into trouble if there are loops that go forever and get stuck. So we add a time-to-live counter that decrements at each hop. #bangbangcon

      1 reply 0 retweets 0 likes
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    5. Liz Fong-Jones‏ @lizthegrey May 12

      We can send a TTL expired message back to the source if we give up due to reaching 0. So how do we get breadcrumbs of where we've been? #bangbangcon

      1 reply 0 retweets 0 likes
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    6. Liz Fong-Jones‏ @lizthegrey May 12

      If you set ttl=0, you get a response back immediately from your first hop saying TTL expired. then you set ttl=1 to get one step further. and so forth. #bangbangcon

      1 reply 0 retweets 0 likes
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    7. Liz Fong-Jones‏ @lizthegrey May 12

      So that's how traceroute works normally. But we can hack it by configuring ourselves to send back a TTL expired message even if you were supposed to send a normal response. #bangbangcon

      1 reply 0 retweets 0 likes
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    8. Liz Fong-Jones‏ @lizthegrey May 12

      And we can also spoof who we send the ttl expired message from. which will send a different numerical ip address. But we want to tell a story, not a set of numbers. #bangbangcon

      1 reply 0 retweets 0 likes
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    9. Liz Fong-Jones‏ @lizthegrey May 12

      So we need to understand how DNS works. It normally translates forward from http://karla.io  to an address like 107.170.239.194, but we also have rdns which reverses the octets, postfixes .in-addr.arpa and does a lookup. But we can... lie in our response. #bangbangcon

      1 reply 0 retweets 1 like
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    10. Liz Fong-Jones‏ @lizthegrey May 12

      You can set rDNS on addresses that you control (e.g. have rented from a provider), but some providers are strict about mapping it so pick a permissive provider. Each line of the story is going to cost $3 per month for the distinct IP address. #bangbangcon

      1 reply 0 retweets 0 likes
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      Rich Felker‏ @RichFelker May 12
      Replying to @lizthegrey

      Cheat: Use ipv6 and they're free. Especially if you use 6to4 encapsulation - then you get permissive rdns free too, under your own auth dns control.

      10:10 AM - 12 May 2018
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