From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/fs/cifs/dns_resolve.c | 99 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 99 insertions(+) create mode 100644 kernel/fs/cifs/dns_resolve.c (limited to 'kernel/fs/cifs/dns_resolve.c') diff --git a/kernel/fs/cifs/dns_resolve.c b/kernel/fs/cifs/dns_resolve.c new file mode 100644 index 000000000..7ede73065 --- /dev/null +++ b/kernel/fs/cifs/dns_resolve.c @@ -0,0 +1,99 @@ +/* + * 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 +#include +#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; +} -- cgit 1.2.3-korg