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08504de718
The Linux kernel suppresses some ICMP error messages by default for UDP sockets. This commit enables full ICMP error reporting, hopefully resulting in faster failover to working name servers.
38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
/* Enable full ICMP errors on a socket.
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Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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int
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__res_enable_icmp (int family, int fd)
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{
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int one = 1;
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switch (family)
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{
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case AF_INET:
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return setsockopt (fd, SOL_IP, IP_RECVERR, &one, sizeof (one));
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case AF_INET6:
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return setsockopt (fd, SOL_IPV6, IPV6_RECVERR, &one, sizeof (one));
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default:
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__set_errno (EAFNOSUPPORT);
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return -1;
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}
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}
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