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/*
* Copyright (C) 2009,2013,2016 Derek Martin <code@pizzashack.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "mutt.h"
int getdnsdomainname (char *d, size_t len)
{
int ret = -1;
#ifdef HAVE_GETADDRINFO
char *node;
long node_len;
struct addrinfo hints;
struct addrinfo *h;
char *p;
*d = '\0';
memset(&hints, 0, sizeof (struct addrinfo));
hints.ai_flags = AI_CANONNAME;
hints.ai_family = AF_UNSPEC;
/* A DNS name can actually be only 253 octets, string is 256 */
if ((node_len = sysconf(_SC_HOST_NAME_MAX)) == -1)
node_len = STRING;
node = safe_malloc(node_len + 1);
if (gethostname(node, node_len))
ret = -1;
else if (getaddrinfo(node, NULL, &hints, &h))
ret = -1;
else
{
if (!h->ai_canonname || !(p = strchr(h->ai_canonname, '.')))
ret = -1;
else
{
strfcpy(d, ++p, len);
ret = 0;
dprint(1, (debugfile, "getdnsdomainname(): %s\n", d));
}
freeaddrinfo(h);
}
FREE (&node);
#endif
return ret;
}
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