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![Rasmus Villemoes](/assets/img/avatar_default.png)
The kernel used to contain two functions for length-delimited, case-insensitive string comparison, strnicmp with correct semantics and a slightly buggy strncasecmp. The latter is the POSIX name, so strnicmp was renamed to strncasecmp, and strnicmp made into a wrapper for the new strncasecmp to avoid breaking existing users. To allow the compat wrapper strnicmp to be removed at some point in the future, and to avoid the extra indirection cost, do s/strnicmp/strncasecmp/g. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Steve French <sfrench@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
378 lines
9.8 KiB
C
378 lines
9.8 KiB
C
/*
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* Contains the CIFS DFS referral mounting routines used for handling
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* traversal via DFS junction point
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*
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* Copyright (c) 2007 Igor Mammedov
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* Copyright (C) International Business Machines Corp., 2008
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* Author(s): Igor Mammedov (niallain@gmail.com)
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* Steve French (sfrench@us.ibm.com)
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/dcache.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <linux/slab.h>
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#include <linux/vfs.h>
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#include <linux/fs.h>
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#include <linux/inet.h>
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifsfs.h"
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#include "dns_resolve.h"
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#include "cifs_debug.h"
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static LIST_HEAD(cifs_dfs_automount_list);
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static void cifs_dfs_expire_automounts(struct work_struct *work);
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static DECLARE_DELAYED_WORK(cifs_dfs_automount_task,
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cifs_dfs_expire_automounts);
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static int cifs_dfs_mountpoint_expiry_timeout = 500 * HZ;
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static void cifs_dfs_expire_automounts(struct work_struct *work)
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{
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struct list_head *list = &cifs_dfs_automount_list;
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mark_mounts_for_expiry(list);
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if (!list_empty(list))
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schedule_delayed_work(&cifs_dfs_automount_task,
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cifs_dfs_mountpoint_expiry_timeout);
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}
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void cifs_dfs_release_automount_timer(void)
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{
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BUG_ON(!list_empty(&cifs_dfs_automount_list));
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cancel_delayed_work_sync(&cifs_dfs_automount_task);
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}
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/**
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* cifs_build_devname - build a devicename from a UNC and optional prepath
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* @nodename: pointer to UNC string
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* @prepath: pointer to prefixpath (or NULL if there isn't one)
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*
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* Build a new cifs devicename after chasing a DFS referral. Allocate a buffer
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* big enough to hold the final thing. Copy the UNC from the nodename, and
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* concatenate the prepath onto the end of it if there is one.
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*
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* Returns pointer to the built string, or a ERR_PTR. Caller is responsible
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* for freeing the returned string.
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*/
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static char *
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cifs_build_devname(char *nodename, const char *prepath)
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{
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size_t pplen;
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size_t unclen;
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char *dev;
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char *pos;
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/* skip over any preceding delimiters */
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nodename += strspn(nodename, "\\");
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if (!*nodename)
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return ERR_PTR(-EINVAL);
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/* get length of UNC and set pos to last char */
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unclen = strlen(nodename);
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pos = nodename + unclen - 1;
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/* trim off any trailing delimiters */
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while (*pos == '\\') {
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--pos;
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--unclen;
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}
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/* allocate a buffer:
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* +2 for preceding "//"
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* +1 for delimiter between UNC and prepath
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* +1 for trailing NULL
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*/
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pplen = prepath ? strlen(prepath) : 0;
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dev = kmalloc(2 + unclen + 1 + pplen + 1, GFP_KERNEL);
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if (!dev)
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return ERR_PTR(-ENOMEM);
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pos = dev;
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/* add the initial "//" */
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*pos = '/';
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++pos;
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*pos = '/';
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++pos;
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/* copy in the UNC portion from referral */
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memcpy(pos, nodename, unclen);
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pos += unclen;
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/* copy the prefixpath remainder (if there is one) */
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if (pplen) {
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*pos = '/';
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++pos;
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memcpy(pos, prepath, pplen);
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pos += pplen;
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}
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/* NULL terminator */
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*pos = '\0';
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convert_delimiter(dev, '/');
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return dev;
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}
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/**
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* cifs_compose_mount_options - creates mount options for refferral
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* @sb_mountdata: parent/root DFS mount options (template)
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* @fullpath: full path in UNC format
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* @ref: server's referral
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* @devname: pointer for saving device name
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*
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* creates mount options for submount based on template options sb_mountdata
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* and replacing unc,ip,prefixpath options with ones we've got form ref_unc.
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*
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* Returns: pointer to new mount options or ERR_PTR.
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* Caller is responcible for freeing retunrned value if it is not error.
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*/
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char *cifs_compose_mount_options(const char *sb_mountdata,
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const char *fullpath,
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const struct dfs_info3_param *ref,
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char **devname)
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{
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int rc;
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char *mountdata = NULL;
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const char *prepath = NULL;
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int md_len;
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char *tkn_e;
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char *srvIP = NULL;
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char sep = ',';
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int off, noff;
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if (sb_mountdata == NULL)
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return ERR_PTR(-EINVAL);
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if (strlen(fullpath) - ref->path_consumed)
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prepath = fullpath + ref->path_consumed;
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*devname = cifs_build_devname(ref->node_name, prepath);
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if (IS_ERR(*devname)) {
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rc = PTR_ERR(*devname);
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*devname = NULL;
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goto compose_mount_options_err;
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}
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rc = dns_resolve_server_name_to_ip(*devname, &srvIP);
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if (rc < 0) {
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cifs_dbg(FYI, "%s: Failed to resolve server part of %s to IP: %d\n",
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__func__, *devname, rc);
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goto compose_mount_options_err;
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}
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/*
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* In most cases, we'll be building a shorter string than the original,
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* but we do have to assume that the address in the ip= option may be
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* much longer than the original. Add the max length of an address
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* string to the length of the original string to allow for worst case.
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*/
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md_len = strlen(sb_mountdata) + INET6_ADDRSTRLEN;
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mountdata = kzalloc(md_len + 1, GFP_KERNEL);
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if (mountdata == NULL) {
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rc = -ENOMEM;
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goto compose_mount_options_err;
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}
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/* copy all options except of unc,ip,prefixpath */
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off = 0;
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if (strncmp(sb_mountdata, "sep=", 4) == 0) {
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sep = sb_mountdata[4];
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strncpy(mountdata, sb_mountdata, 5);
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off += 5;
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}
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do {
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tkn_e = strchr(sb_mountdata + off, sep);
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if (tkn_e == NULL)
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noff = strlen(sb_mountdata + off);
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else
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noff = tkn_e - (sb_mountdata + off) + 1;
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if (strncasecmp(sb_mountdata + off, "unc=", 4) == 0) {
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off += noff;
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continue;
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}
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if (strncasecmp(sb_mountdata + off, "ip=", 3) == 0) {
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off += noff;
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continue;
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}
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if (strncasecmp(sb_mountdata + off, "prefixpath=", 11) == 0) {
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off += noff;
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continue;
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}
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strncat(mountdata, sb_mountdata + off, noff);
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off += noff;
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} while (tkn_e);
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strcat(mountdata, sb_mountdata + off);
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mountdata[md_len] = '\0';
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/* copy new IP and ref share name */
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if (mountdata[strlen(mountdata) - 1] != sep)
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strncat(mountdata, &sep, 1);
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strcat(mountdata, "ip=");
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strcat(mountdata, srvIP);
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/*cifs_dbg(FYI, "%s: parent mountdata: %s\n", __func__, sb_mountdata);*/
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/*cifs_dbg(FYI, "%s: submount mountdata: %s\n", __func__, mountdata );*/
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compose_mount_options_out:
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kfree(srvIP);
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return mountdata;
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compose_mount_options_err:
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kfree(mountdata);
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mountdata = ERR_PTR(rc);
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kfree(*devname);
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*devname = NULL;
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goto compose_mount_options_out;
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}
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/**
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* cifs_dfs_do_refmount - mounts specified path using provided refferal
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* @cifs_sb: parent/root superblock
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* @fullpath: full path in UNC format
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* @ref: server's referral
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*/
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static struct vfsmount *cifs_dfs_do_refmount(struct cifs_sb_info *cifs_sb,
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const char *fullpath, const struct dfs_info3_param *ref)
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{
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struct vfsmount *mnt;
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char *mountdata;
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char *devname = NULL;
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/* strip first '\' from fullpath */
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mountdata = cifs_compose_mount_options(cifs_sb->mountdata,
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fullpath + 1, ref, &devname);
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if (IS_ERR(mountdata))
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return (struct vfsmount *)mountdata;
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mnt = vfs_kern_mount(&cifs_fs_type, 0, devname, mountdata);
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kfree(mountdata);
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kfree(devname);
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return mnt;
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}
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static void dump_referral(const struct dfs_info3_param *ref)
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{
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cifs_dbg(FYI, "DFS: ref path: %s\n", ref->path_name);
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cifs_dbg(FYI, "DFS: node path: %s\n", ref->node_name);
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cifs_dbg(FYI, "DFS: fl: %hd, srv_type: %hd\n",
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ref->flags, ref->server_type);
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cifs_dbg(FYI, "DFS: ref_flags: %hd, path_consumed: %hd\n",
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ref->ref_flag, ref->path_consumed);
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}
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/*
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* Create a vfsmount that we can automount
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*/
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static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
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{
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struct dfs_info3_param *referrals = NULL;
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unsigned int num_referrals = 0;
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struct cifs_sb_info *cifs_sb;
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struct cifs_ses *ses;
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char *full_path;
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unsigned int xid;
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int i;
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int rc;
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struct vfsmount *mnt;
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struct tcon_link *tlink;
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cifs_dbg(FYI, "in %s\n", __func__);
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BUG_ON(IS_ROOT(mntpt));
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/*
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* The MSDFS spec states that paths in DFS referral requests and
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* responses must be prefixed by a single '\' character instead of
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* the double backslashes usually used in the UNC. This function
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* gives us the latter, so we must adjust the result.
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*/
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mnt = ERR_PTR(-ENOMEM);
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full_path = build_path_from_dentry(mntpt);
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if (full_path == NULL)
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goto cdda_exit;
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cifs_sb = CIFS_SB(mntpt->d_inode->i_sb);
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink)) {
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mnt = ERR_CAST(tlink);
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goto free_full_path;
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}
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ses = tlink_tcon(tlink)->ses;
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xid = get_xid();
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rc = get_dfs_path(xid, ses, full_path + 1, cifs_sb->local_nls,
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&num_referrals, &referrals,
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cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
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free_xid(xid);
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cifs_put_tlink(tlink);
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mnt = ERR_PTR(-ENOENT);
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for (i = 0; i < num_referrals; i++) {
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int len;
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dump_referral(referrals + i);
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/* connect to a node */
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len = strlen(referrals[i].node_name);
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if (len < 2) {
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cifs_dbg(VFS, "%s: Net Address path too short: %s\n",
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__func__, referrals[i].node_name);
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mnt = ERR_PTR(-EINVAL);
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break;
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}
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mnt = cifs_dfs_do_refmount(cifs_sb,
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full_path, referrals + i);
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cifs_dbg(FYI, "%s: cifs_dfs_do_refmount:%s , mnt:%p\n",
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__func__, referrals[i].node_name, mnt);
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if (!IS_ERR(mnt))
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goto success;
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}
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/* no valid submounts were found; return error from get_dfs_path() by
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* preference */
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if (rc != 0)
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mnt = ERR_PTR(rc);
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success:
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free_dfs_info_array(referrals, num_referrals);
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free_full_path:
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kfree(full_path);
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cdda_exit:
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cifs_dbg(FYI, "leaving %s\n" , __func__);
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return mnt;
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}
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/*
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* Attempt to automount the referral
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*/
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struct vfsmount *cifs_dfs_d_automount(struct path *path)
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{
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struct vfsmount *newmnt;
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cifs_dbg(FYI, "in %s\n", __func__);
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newmnt = cifs_dfs_do_automount(path->dentry);
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if (IS_ERR(newmnt)) {
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cifs_dbg(FYI, "leaving %s [automount failed]\n" , __func__);
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return newmnt;
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}
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mntget(newmnt); /* prevent immediate expiration */
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mnt_set_expiry(newmnt, &cifs_dfs_automount_list);
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schedule_delayed_work(&cifs_dfs_automount_task,
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cifs_dfs_mountpoint_expiry_timeout);
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cifs_dbg(FYI, "leaving %s [ok]\n" , __func__);
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return newmnt;
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}
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const struct inode_operations cifs_dfs_referral_inode_operations = {
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};
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