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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. Jonas Termansen‏ @sortiecat 27 Sep 2017

      I'll be referencing manual pages as “foo(n)” where “foo” is the manual page name and “n” is the section name. 4/

      1 reply 0 retweets 0 likes
      Show this thread
    2. Jonas Termansen‏ @sortiecat 27 Sep 2017

      On your Unix-like system, run ”man n foo” in your shell to view that manual page, or use the manual page browser website of your OS. 5/

      1 reply 0 retweets 0 likes
      Show this thread
    3. Jonas Termansen‏ @sortiecat 27 Sep 2017

      A UDP socket is made by running socket(2): socket(AF_INET or AF_INET6, SOCK_DGRAM, IPPROTO_UDP). 6/

      1 reply 0 retweets 0 likes
      Show this thread
    4. Jonas Termansen‏ @sortiecat 27 Sep 2017

      AF_INET is the IP version 4 address family, AF_INET6 is IPv6. 7/

      1 reply 0 retweets 0 likes
      Show this thread
    5. Jonas Termansen‏ @sortiecat 27 Sep 2017

      You can pass 0 instead of IPROTO_UDP as the socket protocol, because UDP is the default datagram protocol for the Internet. 8/

      1 reply 0 retweets 0 likes
      Show this thread
    6. Jonas Termansen‏ @sortiecat 27 Sep 2017

      Port 0 is invalid. Upon creation, a UDP socket has the local address 0.0.0.0:0 and remote address 0.0.0.0:0. (Likewise with IPv6). 9/

      1 reply 0 retweets 0 likes
      Show this thread
    7. Jonas Termansen‏ @sortiecat 27 Sep 2017

      getsockname(2) gives the local address and getpeername(2) gives the remote address. UDP sockets are unbounded and unremoted on creation. 10/

      1 reply 0 retweets 0 likes
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    8. Jonas Termansen‏ @sortiecat 27 Sep 2017

      You can bind to a particular local address and port using bind(2), but you can only bind once. 11/

      2 replies 0 retweets 0 likes
      Show this thread
    9. Jonas Termansen‏ @sortiecat 27 Sep 2017

      The address must be the address of any network interface, or the any address (0.0.0.0, ::) to say you are OK with whatever interface. 12/

      2 replies 0 retweets 0 likes
      Show this thread
    10. Laurent Bercot‏ @laurentbercot 28 Sep 2017
      Replying to @sortiecat

      Something I learned recently: the ANY address is greedy. It will even match interfaces coming up *after* your socket is bound.

      2 replies 0 retweets 1 like
      Rich Felker‏ @RichFelker 28 Sep 2017
      Replying to @laurentbercot @sortiecat

      Um, that's kinda the whole point, & why software that refuses to bind 0.0.0.0, but insists on enumerating IFs & binding each, is so broken.

      10:42 AM - 28 Sep 2017
      • 2 Likes
      • Finite Nate Machine Jonas Termansen
      1 reply 0 retweets 2 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 28 Sep 2017
          Replying to @RichFelker @laurentbercot @sortiecat

          Such software is unusable on DHCP (or in the distant past, on dialup). I actually had to patch out the idiocy in lots of sw back then.

          2 replies 0 retweets 1 like
        3. Jonas Termansen‏ @sortiecat 28 Sep 2017
          Replying to @RichFelker @laurentbercot

          I don't have so much experience with such software, a bit surprised, it's not portable/trivial to iterate addresses while 0.0.0.0 just works

          1 reply 0 retweets 1 like
        4. Rich Felker‏ @RichFelker 28 Sep 2017
          Replying to @sortiecat @laurentbercot

          This is software (and esp 1990s software). Why do anything the portable/trivial way when you have have 1000 #ifdefs?

          2 replies 0 retweets 0 likes
        5. Jonas Termansen‏ @sortiecat 28 Sep 2017
          Replying to @RichFelker @laurentbercot

          Didn't so much like existing APIs, Sortix is getting yet another network interface interface. Unfinished and simple. https://users-cs.au.dk/~sortie/sortix/release/volatile/man/man4/if.4.html …

          0 replies 0 retweets 0 likes
        6. End of conversation

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