1  /* Name server address at specified index in res_state.
       2     Copyright (C) 2015-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <assert.h>
      20  #include <resolv.h>
      21  #include <resolv-internal.h>
      22  
      23  struct sockaddr *
      24  __res_get_nsaddr (res_state statp, unsigned int n)
      25  {
      26    assert (n < statp->nscount);
      27  
      28    if (statp->nsaddr_list[n].sin_family == 0
      29        && statp->_u._ext.nsaddrs[n] != NULL)
      30      /* statp->_u._ext.nsaddrs[n] holds an address that is larger than
      31         struct sockaddr, and user code did not update
      32         statp->nsaddr_list[n].  */
      33      return (struct sockaddr *) statp->_u._ext.nsaddrs[n];
      34    else
      35      /* User code updated statp->nsaddr_list[n], or statp->nsaddr_list[n]
      36         has the same content as statp->_u._ext.nsaddrs[n].  */
      37      return (struct sockaddr *) (void *) &statp->nsaddr_list[n];
      38  }
      39  libc_hidden_def (__res_get_nsaddr)