dns_resolve.c 2.83 KB
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/*
 *  fs/cifs/dns_resolve.c
 *
 *   Copyright (c) 2007 Igor Mammedov
 *   Author(s): Igor Mammedov (niallain@gmail.com)
 *              Steve French (sfrench@us.ibm.com)
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 *              Wang Lei (wang840925@gmail.com)
 *		David Howells (dhowells@redhat.com)
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 *
 *   Contains the CIFS DFS upcall routines used for hostname to
 *   IP address translation.
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library 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 Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

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#include <linux/slab.h>
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#include <linux/dns_resolver.h>
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#include "dns_resolve.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"

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/**
 * dns_resolve_server_name_to_ip - Resolve UNC server name to ip address.
 * @unc: UNC path specifying the server
 * @ip_addr: Where to return the IP address.
 *
 * The IP address will be returned in string form, and the caller is
 * responsible for freeing it.
 *
 * Returns length of result on success, -ve on error.
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 */
int
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dns_resolve_server_name_to_ip(const char *unc, char **ip_addr)
{
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	struct sockaddr_storage ss;
	const char *hostname, *sep;
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	char *name;
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	int len, rc;
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	if (!ip_addr || !unc)
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		return -EINVAL;

	len = strlen(unc);
	if (len < 3) {
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		cifs_dbg(FYI, "%s: unc is too short: %s\n", __func__, unc);
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		return -EINVAL;
	}
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	/* Discount leading slashes for cifs */
	len -= 2;
	hostname = unc + 2;
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	/* Search for server name delimiter */
	sep = memchr(hostname, '\\', len);
	if (sep)
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		len = sep - hostname;
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	else
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		cifs_dbg(FYI, "%s: probably server name is whole unc: %s\n",
			 __func__, unc);
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	/* Try to interpret hostname as an IPv4 or IPv6 address */
	rc = cifs_convert_address((struct sockaddr *)&ss, hostname, len);
	if (rc > 0)
		goto name_is_IP_address;

	/* Perform the upcall */
	rc = dns_query(NULL, hostname, len, NULL, ip_addr, NULL);
	if (rc < 0)
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		cifs_dbg(FYI, "%s: unable to resolve: %*.*s\n",
			 __func__, len, len, hostname);
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	else
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		cifs_dbg(FYI, "%s: resolved: %*.*s to %s\n",
			 __func__, len, len, hostname, *ip_addr);
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	return rc;

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name_is_IP_address:
	name = kmalloc(len + 1, GFP_KERNEL);
	if (!name)
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		return -ENOMEM;
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	memcpy(name, hostname, len);
	name[len] = 0;
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	cifs_dbg(FYI, "%s: unc is IP, skipping dns upcall: %s\n",
		 __func__, name);
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	*ip_addr = name;
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	return 0;
}