forked from Minki/linux
[CIFS] Forgot to add two new files from previous commit
Thanks to Igor for noticing this. CC: Igor Mammedov <niallain@gmail.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French
parent
6103335de8
commit
197c183f35
123
fs/cifs/dns_resolve.c
Normal file
123
fs/cifs/dns_resolve.c
Normal file
@ -0,0 +1,123 @@
|
||||
/*
|
||||
* fs/cifs/dns_resolve.c
|
||||
*
|
||||
* Copyright (c) 2007 Igor Mammedov
|
||||
* Author(s): Igor Mammedov (niallain@gmail.com)
|
||||
* Steve French (sfrench@us.ibm.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 <keys/user-type.h>
|
||||
#include "dns_resolve.h"
|
||||
#include "cifsglob.h"
|
||||
#include "cifsproto.h"
|
||||
#include "cifs_debug.h"
|
||||
|
||||
static int dns_resolver_instantiate(struct key *key, const void *data,
|
||||
size_t datalen)
|
||||
{
|
||||
int rc = 0;
|
||||
char *ip;
|
||||
|
||||
ip = kmalloc(datalen+1, GFP_KERNEL);
|
||||
if (!ip)
|
||||
return -ENOMEM;
|
||||
|
||||
memcpy(ip, data, datalen);
|
||||
ip[datalen] = '\0';
|
||||
|
||||
rcu_assign_pointer(key->payload.data, ip);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
struct key_type key_type_dns_resolver = {
|
||||
.name = "dns_resolver",
|
||||
.def_datalen = sizeof(struct in_addr),
|
||||
.describe = user_describe,
|
||||
.instantiate = dns_resolver_instantiate,
|
||||
.match = user_match,
|
||||
};
|
||||
|
||||
|
||||
/* Resolves server name to ip address.
|
||||
* input:
|
||||
* unc - server UNC
|
||||
* output:
|
||||
* *ip_addr - pointer to server ip, caller responcible for freeing it.
|
||||
* return 0 on success
|
||||
*/
|
||||
int
|
||||
dns_resolve_server_name_to_ip(const char *unc, char **ip_addr) {
|
||||
int rc = -EAGAIN;
|
||||
struct key *rkey;
|
||||
char *name;
|
||||
int len;
|
||||
|
||||
if ((!ip_addr) || (!unc))
|
||||
return -EINVAL;
|
||||
|
||||
/* search for server name delimiter */
|
||||
len = strlen(unc);
|
||||
if (len < 3) {
|
||||
cFYI(1, ("%s: unc is too short: %s", __FUNCTION__, unc));
|
||||
return -EINVAL;
|
||||
}
|
||||
len -= 2;
|
||||
name = memchr(unc+2, '\\', len);
|
||||
if (!name) {
|
||||
cFYI(1, ("%s: probably server name is whole unc: %s",
|
||||
__FUNCTION__, unc));
|
||||
} else {
|
||||
len = (name - unc) - 2/* leading // */;
|
||||
}
|
||||
|
||||
name = kmalloc(len+1, GFP_KERNEL);
|
||||
if (!name) {
|
||||
rc = -ENOMEM;
|
||||
return rc;
|
||||
}
|
||||
memcpy(name, unc+2, len);
|
||||
name[len] = 0;
|
||||
|
||||
rkey = request_key(&key_type_dns_resolver, name, "");
|
||||
if (!IS_ERR(rkey)) {
|
||||
len = strlen(rkey->payload.data);
|
||||
*ip_addr = kmalloc(len+1, GFP_KERNEL);
|
||||
if (*ip_addr) {
|
||||
memcpy(*ip_addr, rkey->payload.data, len);
|
||||
(*ip_addr)[len] = '\0';
|
||||
cFYI(1, ("%s: resolved: %s to %s", __FUNCTION__,
|
||||
rkey->description,
|
||||
*ip_addr
|
||||
));
|
||||
rc = 0;
|
||||
} else {
|
||||
rc = -ENOMEM;
|
||||
}
|
||||
key_put(rkey);
|
||||
} else {
|
||||
cERROR(1, ("%s: unable to resolve: %s", __FUNCTION__, name));
|
||||
}
|
||||
|
||||
kfree(name);
|
||||
return rc;
|
||||
}
|
||||
|
||||
|
||||
32
fs/cifs/dns_resolve.h
Normal file
32
fs/cifs/dns_resolve.h
Normal file
@ -0,0 +1,32 @@
|
||||
/*
|
||||
* fs/cifs/dns_resolve.h -- DNS Resolver upcall management for CIFS DFS
|
||||
* Handles host name to IP address resolution
|
||||
*
|
||||
* Copyright (c) International Business Machines Corp., 2008
|
||||
* Author(s): Steve French (sfrench@us.ibm.com)
|
||||
*
|
||||
* 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
|
||||
*/
|
||||
|
||||
#ifndef _DNS_RESOLVE_H
|
||||
#define _DNS_RESOLVE_H
|
||||
|
||||
#ifdef __KERNEL__
|
||||
#include <linux/key-type.h>
|
||||
extern struct key_type key_type_dns_resolver;
|
||||
extern int dns_resolve_server_name_to_ip(const char *unc, char **ip_addr);
|
||||
#endif /* KERNEL */
|
||||
|
||||
#endif /* _DNS_RESOLVE_H */
|
||||
Loading…
Reference in New Issue
Block a user