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5f393deb30
Wrapper function to parse resolv.conf and talk to multiple nameservers. This is the code where we might want to add a "working nameserver" cache. glibc always looks at the first configured nameserver. If that's dead, glibc runs into a timeout and only then asks the second one that might succeed. When more than one dns query is to be performed, these timeouts add up. Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/*
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* Unix SMB/CIFS implementation.
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* Internal DNS query structures
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* Copyright (C) Volker Lendecke 2018
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <talloc.h>
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#include <errno.h>
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#include "libcli/dns/dns_lookup.h"
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#include "lib/util/debug.h"
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static int dns_lookuptest1(void)
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{
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struct dns_name_packet *reply = NULL;
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int ret;
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ret = dns_lookup(NULL, "www.samba.org", DNS_QCLASS_IN, DNS_QTYPE_A,
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NULL, &reply);
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if (ret != 0) {
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fprintf(stderr, "dns_lookup failed: %s\n", strerror(ret));
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return ret;
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}
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TALLOC_FREE(reply);
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return 0;
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}
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int main(int argc, const char *argv[]) {
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int ret;
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setup_logging(argv[0], DEBUG_DEFAULT_STDERR);
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debug_parse_levels("10");
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ret = dns_lookuptest1();
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if (ret != 0) {
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return 1;
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}
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return 0;
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}
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