resolv/res_enable_icmp.c

   1 /* Enable full ICMP errors on a socket.
   2    Copyright (C) 2019-2022 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 }