1  /* Enable full ICMP errors on a socket.
       2     Copyright (C) 2019-2023 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 <errno.h>
      20  #include <netinet/in.h>
      21  #include <sys/socket.h>
      22  
      23  int
      24  __res_enable_icmp (int family, int fd)
      25  {
      26    int one = 1;
      27    switch (family)
      28      {
      29      case AF_INET:
      30        return __setsockopt (fd, SOL_IP, IP_RECVERR, &one, sizeof (one));
      31      case AF_INET6:
      32        return __setsockopt (fd, SOL_IPV6, IPV6_RECVERR, &one, sizeof (one));
      33      default:
      34        __set_errno (EAFNOSUPPORT);
      35        return -1;
      36      }
      37  }