/*
 *  fs/cifs/dns_resolve.c
 *
 *   Copyright (c) 2007 Igor Mammedov
 *   Author(s): Igor Mammedov (niallain@gmail.com)
 *              Steve French (sfrench@us.ibm.com)
 *              Wang Lei (wang840925@gmail.com)
 *		David Howells (dhowells@redhat.com)
 *
 *   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
 */

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

/**
 * dns_resolve_server_name_to_ip - Resolve UNC server name to ip address.
 * @unc: UNC path specifying the server (with '/' as delimiter)
 * @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.
 */
int
dns_resolve_server_name_to_ip(const char *unc, char **ip_addr)
{
	struct sockaddr_storage ss;
	const char *hostname, *sep;
	char *name;
	int len, rc;

	if (!ip_addr || !unc)
		return -EINVAL;

	len = strlen(unc);
	if (len < 3) {
		cifs_dbg(FYI, "%s: unc is too short: %s\n", __func__, unc);
		return -EINVAL;
	}

	/* Discount leading slashes for cifs */
	len -= 2;
	hostname = unc + 2;

	/* Search for server name delimiter */
	sep = memchr(hostname, '/', len);
	if (sep)
		len = sep - hostname;
	else
		cifs_dbg(FYI, "%s: probably server name is whole unc: %s\n",
			 __func__, unc);

	/* 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)
		cifs_dbg(FYI, "%s: unable to resolve: %*.*s\n",
			 __func__, len, len, hostname);
	else
		cifs_dbg(FYI, "%s: resolved: %*.*s to %s\n",
			 __func__, len, len, hostname, *ip_addr);
	return rc;

name_is_IP_address:
	name = kmalloc(len + 1, GFP_KERNEL);
	if (!name)
		return -ENOMEM;
	memcpy(name, hostname, len);
	name[len] = 0;
	cifs_dbg(FYI, "%s: unc is IP, skipping dns upcall: %s\n",
		 __func__, name);
	*ip_addr = name;
	return 0;
}
git.cgi/linux/net-next.git/log/net/irda?id=76e0e70e6452b971a69cc9794ff4a6715c11f7f2'>irda</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/irda/ircomm?id=76e0e70e6452b971a69cc9794ff4a6715c11f7f2'>ircomm</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/irda/ircomm/ircomm_tty_ioctl.c?id=76e0e70e6452b971a69cc9794ff4a6715c11f7f2'>ircomm_tty_ioctl.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/irda/ircomm/ircomm_tty_ioctl.c?id=76e0e70e6452b971a69cc9794ff4a6715c11f7f2&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Raju Lakkaraju &lt;Raju.Lakkaraju@microsemi.com&gt;</td><td class='right'>2017-02-07 19:10:26 +0530</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-02-08 13:29:04 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211/led.c?id=04d8a0a5f3b6887543850d991a5e37c4ec90e250'>04d8a0a5f3b6887543850d991a5e37c4ec90e250</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/mac80211/led.c?id=04d8a0a5f3b6887543850d991a5e37c4ec90e250'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=04d8a0a5f3b6887543850d991a5e37c4ec90e250'>ee1fafb2122c2b29c7cb19e571bd7229afdbf847</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/mac80211/led.c?id=04d8a0a5f3b6887543850d991a5e37c4ec90e250'>net/mac80211/led.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211/led.c?id=ff4cf0e5ce952488074aa7f47734af1794f55fbc'>ff4cf0e5ce952488074aa7f47734af1794f55fbc</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/mac80211/led.c?id=04d8a0a5f3b6887543850d991a5e37c4ec90e250&amp;id2=ff4cf0e5ce952488074aa7f47734af1794f55fbc'>diff</a>)</td></tr></table>
<div class='commit-subject'>net: phy: Add LED mode driver for Microsemi PHYs.</div><div class='commit-msg'>LED Mode:
Microsemi PHY support 2 LEDs (LED[0] and LED[1]) to display different
status information that can be selected by setting LED mode.

LED Mode parameter (vsc8531, led-0-mode) and (vsc8531, led-1-mode) get
from Device Tree.

Signed-off-by: Raju Lakkaraju &lt;Raju.Lakkaraju@microsemi.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=04d8a0a5f3b6887543850d991a5e37c4ec90e250'>Diffstat</a> (limited to 'net/mac80211/led.c')</div><table summary='diffstat' class='diffstat'>