[Bug 1674479] [NEW] gethostbyname: Unknown server error when resolving hostnames with underscore

[Krzysztof Klimonda]

Public bug reported:

This small snippet of code returns "gethostbyname: Unknown server error"
when called under 14.04 and 16.04:

-----8<--------
#include <stdio.h>
#include <netdb.h>
 
 
int main(int argc, char *argv[])
{
    struct hostent *lh = gethostbyname("_http._tcp.nova.clouds.archive.ubuntu.com");
 
    if (lh)
        puts(lh->h_name);
    else
        herror("gethostbyname");
}
-----8<--------

While I have a feeling this hostname is not valid, that's what apt is
trying to resolve after SRV query fails. The same code seems to be
working in 16.10.

** Affects: glibc (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1674479

Title:
  gethostbyname: Unknown server error when resolving hostnames with
  underscore

Status in glibc package in Ubuntu:
  New

Bug description:
  This small snippet of code returns "gethostbyname: Unknown server
  error" when called under 14.04 and 16.04:

  -----8<--------
  #include <stdio.h>
  #include <netdb.h>
   
   
  int main(int argc, char *argv[])
  {
      struct hostent *lh = gethostbyname("_http._tcp.nova.clouds.archive.ubuntu.com");
   
      if (lh)
          puts(lh->h_name);
      else
          herror("gethostbyname");
  }
  -----8<--------

  While I have a feeling this hostname is not valid, that's what apt is
  trying to resolve after SRV query fails. The same code seems to be
  working in 16.10.

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