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samba-mirror/source3/smbd/dir.c
2001-12-17 19:16:22 +00:00

966 lines
25 KiB
C

/*
Unix SMB/Netbios implementation.
Version 1.9.
Directory handling routines
Copyright (C) Andrew Tridgell 1992-1998
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
/*
This module implements directory related functions for Samba.
*/
typedef struct _dptr_struct {
struct _dptr_struct *next, *prev;
int dnum;
uint16 spid;
connection_struct *conn;
void *ptr;
BOOL expect_close;
char *wcard; /* Field only used for trans2_ searches */
uint16 attr; /* Field only used for trans2_ searches */
char *path;
} dptr_struct;
static struct bitmap *dptr_bmap;
static dptr_struct *dirptrs;
static int dptrs_open = 0;
#define INVALID_DPTR_KEY (-3)
/****************************************************************************
Initialise the dir bitmap.
****************************************************************************/
void init_dptrs(void)
{
static BOOL dptrs_init=False;
if (dptrs_init)
return;
dptr_bmap = bitmap_allocate(MAX_DIRECTORY_HANDLES);
if (!dptr_bmap)
exit_server("out of memory in init_dptrs");
dptrs_init = True;
}
/****************************************************************************
Idle a dptr - the directory is closed but the control info is kept.
****************************************************************************/
static void dptr_idle(dptr_struct *dptr)
{
if (dptr->ptr) {
DEBUG(4,("Idling dptr dnum %d\n",dptr->dnum));
dptrs_open--;
CloseDir(dptr->ptr);
dptr->ptr = NULL;
}
}
/****************************************************************************
Idle the oldest dptr.
****************************************************************************/
static void dptr_idleoldest(void)
{
dptr_struct *dptr;
/*
* Go to the end of the list.
*/
for(dptr = dirptrs; dptr && dptr->next; dptr = dptr->next)
;
if(!dptr) {
DEBUG(0,("No dptrs available to idle ?\n"));
return;
}
/*
* Idle the oldest pointer.
*/
for(; dptr; dptr = dptr->prev) {
if (dptr->ptr) {
dptr_idle(dptr);
return;
}
}
}
/****************************************************************************
Get the dptr_struct for a dir index.
****************************************************************************/
static dptr_struct *dptr_get(int key, BOOL forclose)
{
dptr_struct *dptr;
for(dptr = dirptrs; dptr; dptr = dptr->next) {
if(dptr->dnum == key) {
if (!forclose && !dptr->ptr) {
if (dptrs_open >= MAX_OPEN_DIRECTORIES)
dptr_idleoldest();
DEBUG(4,("Reopening dptr key %d\n",key));
if ((dptr->ptr = OpenDir(dptr->conn, dptr->path, True)))
dptrs_open++;
}
DLIST_PROMOTE(dirptrs,dptr);
return dptr;
}
}
return(NULL);
}
/****************************************************************************
Get the dptr ptr for a dir index.
****************************************************************************/
static void *dptr_ptr(int key)
{
dptr_struct *dptr = dptr_get(key, False);
if (dptr)
return(dptr->ptr);
return(NULL);
}
/****************************************************************************
Get the dir path for a dir index.
****************************************************************************/
char *dptr_path(int key)
{
dptr_struct *dptr = dptr_get(key, False);
if (dptr)
return(dptr->path);
return(NULL);
}
/****************************************************************************
Get the dir wcard for a dir index (lanman2 specific).
****************************************************************************/
char *dptr_wcard(int key)
{
dptr_struct *dptr = dptr_get(key, False);
if (dptr)
return(dptr->wcard);
return(NULL);
}
/****************************************************************************
Set the dir wcard for a dir index (lanman2 specific).
Returns 0 on ok, 1 on fail.
****************************************************************************/
BOOL dptr_set_wcard(int key, char *wcard)
{
dptr_struct *dptr = dptr_get(key, False);
if (dptr) {
dptr->wcard = wcard;
return True;
}
return False;
}
/****************************************************************************
Set the dir attrib for a dir index (lanman2 specific).
Returns 0 on ok, 1 on fail.
****************************************************************************/
BOOL dptr_set_attr(int key, uint16 attr)
{
dptr_struct *dptr = dptr_get(key, False);
if (dptr) {
dptr->attr = attr;
return True;
}
return False;
}
/****************************************************************************
Get the dir attrib for a dir index (lanman2 specific)
****************************************************************************/
uint16 dptr_attr(int key)
{
dptr_struct *dptr = dptr_get(key, False);
if (dptr)
return(dptr->attr);
return(0);
}
/****************************************************************************
Close a dptr (internal func).
****************************************************************************/
static void dptr_close_internal(dptr_struct *dptr)
{
DEBUG(4,("closing dptr key %d\n",dptr->dnum));
DLIST_REMOVE(dirptrs, dptr);
/*
* Free the dnum in the bitmap. Remember the dnum value is always
* biased by one with respect to the bitmap.
*/
if(bitmap_query( dptr_bmap, dptr->dnum - 1) != True) {
DEBUG(0,("dptr_close_internal : Error - closing dnum = %d and bitmap not set !\n",
dptr->dnum ));
}
bitmap_clear(dptr_bmap, dptr->dnum - 1);
if (dptr->ptr) {
CloseDir(dptr->ptr);
dptrs_open--;
}
/* Lanman 2 specific code */
SAFE_FREE(dptr->wcard);
string_set(&dptr->path,"");
SAFE_FREE(dptr);
}
/****************************************************************************
Close a dptr given a key.
****************************************************************************/
void dptr_close(int *key)
{
dptr_struct *dptr;
if(*key == INVALID_DPTR_KEY)
return;
/* OS/2 seems to use -1 to indicate "close all directories" */
if (*key == -1) {
dptr_struct *next;
for(dptr = dirptrs; dptr; dptr = next) {
next = dptr->next;
dptr_close_internal(dptr);
}
*key = INVALID_DPTR_KEY;
return;
}
dptr = dptr_get(*key, True);
if (!dptr) {
DEBUG(0,("Invalid key %d given to dptr_close\n", *key));
return;
}
dptr_close_internal(dptr);
*key = INVALID_DPTR_KEY;
}
/****************************************************************************
Close all dptrs for a cnum.
****************************************************************************/
void dptr_closecnum(connection_struct *conn)
{
dptr_struct *dptr, *next;
for(dptr = dirptrs; dptr; dptr = next) {
next = dptr->next;
if (dptr->conn == conn)
dptr_close_internal(dptr);
}
}
/****************************************************************************
Idle all dptrs for a cnum.
****************************************************************************/
void dptr_idlecnum(connection_struct *conn)
{
dptr_struct *dptr;
for(dptr = dirptrs; dptr; dptr = dptr->next) {
if (dptr->conn == conn && dptr->ptr)
dptr_idle(dptr);
}
}
/****************************************************************************
Close a dptr that matches a given path, only if it matches the spid also.
****************************************************************************/
void dptr_closepath(char *path,uint16 spid)
{
dptr_struct *dptr, *next;
for(dptr = dirptrs; dptr; dptr = next) {
next = dptr->next;
if (spid == dptr->spid && strequal(dptr->path,path))
dptr_close_internal(dptr);
}
}
/****************************************************************************
Start a directory listing.
****************************************************************************/
static BOOL start_dir(connection_struct *conn,char *directory)
{
DEBUG(5,("start_dir dir=%s\n",directory));
if (!check_name(directory,conn))
return(False);
if (! *directory)
directory = ".";
conn->dirptr = OpenDir(conn, directory, True);
if (conn->dirptr) {
dptrs_open++;
string_set(&conn->dirpath,directory);
return(True);
}
return(False);
}
/****************************************************************************
Try and close the oldest handle not marked for
expect close in the hope that the client has
finished with that one.
****************************************************************************/
static void dptr_close_oldest(BOOL old)
{
dptr_struct *dptr;
/*
* Go to the end of the list.
*/
for(dptr = dirptrs; dptr && dptr->next; dptr = dptr->next)
;
if(!dptr) {
DEBUG(0,("No old dptrs available to close oldest ?\n"));
return;
}
/*
* If 'old' is true, close the oldest oldhandle dnum (ie. 1 < dnum < 256) that
* does not have expect_close set. If 'old' is false, close
* one of the new dnum handles.
*/
for(; dptr; dptr = dptr->prev) {
if ((old && (dptr->dnum < 256) && !dptr->expect_close) ||
(!old && (dptr->dnum > 255))) {
dptr_close_internal(dptr);
return;
}
}
}
/****************************************************************************
Create a new dir ptr. If the flag old_handle is true then we must allocate
from the bitmap range 0 - 255 as old SMBsearch directory handles are only
one byte long. If old_handle is false we allocate from the range
256 - MAX_DIRECTORY_HANDLES. We bias the number we return by 1 to ensure
a directory handle is never zero. All the above is folklore taught to
me at Andrew's knee.... :-) :-). JRA.
****************************************************************************/
int dptr_create(connection_struct *conn,char *path, BOOL old_handle, BOOL expect_close,uint16 spid)
{
dptr_struct *dptr;
if (!start_dir(conn,path))
return(-2); /* Code to say use a unix error return code. */
if (dptrs_open >= MAX_OPEN_DIRECTORIES)
dptr_idleoldest();
dptr = (dptr_struct *)malloc(sizeof(dptr_struct));
if(!dptr) {
DEBUG(0,("malloc fail in dptr_create.\n"));
return -1;
}
ZERO_STRUCTP(dptr);
if(old_handle) {
/*
* This is an old-style SMBsearch request. Ensure the
* value we return will fit in the range 1-255.
*/
dptr->dnum = bitmap_find(dptr_bmap, 0);
if(dptr->dnum == -1 || dptr->dnum > 254) {
/*
* Try and close the oldest handle not marked for
* expect close in the hope that the client has
* finished with that one.
*/
dptr_close_oldest(True);
/* Now try again... */
dptr->dnum = bitmap_find(dptr_bmap, 0);
if(dptr->dnum == -1 || dptr->dnum > 254) {
DEBUG(0,("dptr_create: returned %d: Error - all old dirptrs in use ?\n", dptr->dnum));
SAFE_FREE(dptr);
return -1;
}
}
} else {
/*
* This is a new-style trans2 request. Allocate from
* a range that will return 256 - MAX_DIRECTORY_HANDLES.
*/
dptr->dnum = bitmap_find(dptr_bmap, 255);
if(dptr->dnum == -1 || dptr->dnum < 255) {
/*
* Try and close the oldest handle close in the hope that
* the client has finished with that one. This will only
* happen in the case of the Win98 client bug where it leaks
* directory handles.
*/
dptr_close_oldest(False);
/* Now try again... */
dptr->dnum = bitmap_find(dptr_bmap, 255);
if(dptr->dnum == -1 || dptr->dnum < 255) {
DEBUG(0,("dptr_create: returned %d: Error - all new dirptrs in use ?\n", dptr->dnum));
SAFE_FREE(dptr);
return -1;
}
}
}
bitmap_set(dptr_bmap, dptr->dnum);
dptr->dnum += 1; /* Always bias the dnum by one - no zero dnums allowed. */
dptr->ptr = conn->dirptr;
string_set(&dptr->path,path);
dptr->conn = conn;
dptr->spid = spid;
dptr->expect_close = expect_close;
dptr->wcard = NULL; /* Only used in lanman2 searches */
dptr->attr = 0; /* Only used in lanman2 searches */
DLIST_ADD(dirptrs, dptr);
DEBUG(3,("creating new dirptr %d for path %s, expect_close = %d\n",
dptr->dnum,path,expect_close));
return(dptr->dnum);
}
/****************************************************************************
Fill the 5 byte server reserved dptr field.
****************************************************************************/
BOOL dptr_fill(char *buf1,unsigned int key)
{
unsigned char *buf = (unsigned char *)buf1;
void *p = dptr_ptr(key);
uint32 offset;
if (!p) {
DEBUG(1,("filling null dirptr %d\n",key));
return(False);
}
offset = TellDir(p);
DEBUG(6,("fill on key %u dirptr 0x%lx now at %d\n",key,
(long)p,(int)offset));
buf[0] = key;
SIVAL(buf,1,offset | DPTR_MASK);
return(True);
}
/****************************************************************************
Fetch the dir ptr and seek it given the 5 byte server field.
****************************************************************************/
void *dptr_fetch(char *buf,int *num)
{
unsigned int key = *(unsigned char *)buf;
void *p = dptr_ptr(key);
uint32 offset;
if (!p) {
DEBUG(3,("fetched null dirptr %d\n",key));
return(NULL);
}
*num = key;
offset = IVAL(buf,1)&~DPTR_MASK;
SeekDir(p,offset);
DEBUG(3,("fetching dirptr %d for path %s at offset %d\n",
key,dptr_path(key),offset));
return(p);
}
/****************************************************************************
Fetch the dir ptr.
****************************************************************************/
void *dptr_fetch_lanman2(int dptr_num)
{
void *p = dptr_ptr(dptr_num);
if (!p) {
DEBUG(3,("fetched null dirptr %d\n",dptr_num));
return(NULL);
}
DEBUG(3,("fetching dirptr %d for path %s\n",dptr_num,dptr_path(dptr_num)));
return(p);
}
/****************************************************************************
Check a filetype for being valid.
****************************************************************************/
BOOL dir_check_ftype(connection_struct *conn,int mode,SMB_STRUCT_STAT *st,int dirtype)
{
if (((mode & ~dirtype) & (aHIDDEN | aSYSTEM | aDIR)) != 0)
return False;
return True;
}
/****************************************************************************
Get an 8.3 directory entry.
****************************************************************************/
BOOL get_dir_entry(connection_struct *conn,char *mask,int dirtype,char *fname,
SMB_OFF_T *size,int *mode,time_t *date,BOOL check_descend)
{
char *dname;
BOOL found = False;
SMB_STRUCT_STAT sbuf;
pstring path;
pstring pathreal;
BOOL isrootdir;
pstring filename;
BOOL needslash;
*path = *pathreal = *filename = 0;
isrootdir = (strequal(conn->dirpath,"./") ||
strequal(conn->dirpath,".") ||
strequal(conn->dirpath,"/"));
needslash = ( conn->dirpath[strlen(conn->dirpath) -1] != '/');
if (!conn->dirptr)
return(False);
while (!found)
{
dname = ReadDirName(conn->dirptr);
DEBUG(6,("readdir on dirptr 0x%lx now at offset %d\n",
(long)conn->dirptr,TellDir(conn->dirptr)));
if (dname == NULL)
return(False);
pstrcpy(filename,dname);
/* notice the special *.* handling. This appears to be the only difference
between the wildcard handling in this routine and in the trans2 routines.
see masktest for a demo
*/
if ((strcmp(mask,"*.*") == 0) ||
mask_match(filename,mask,False) ||
(name_map_mangle(filename,True,False,SNUM(conn)) &&
mask_match(filename,mask,False)))
{
if (isrootdir && (strequal(filename,"..") || strequal(filename,".")))
continue;
if (!is_8_3(filename, False)) {
name_map_mangle(filename,True,False,SNUM(conn));
}
pstrcpy(fname,filename);
*path = 0;
pstrcpy(path,conn->dirpath);
if(needslash)
pstrcat(path,"/");
pstrcpy(pathreal,path);
pstrcat(path,fname);
pstrcat(pathreal,dname);
if (conn->vfs_ops.stat(conn, pathreal, &sbuf) != 0)
{
DEBUG(5,("Couldn't stat 1 [%s]. Error = %s\n",path, strerror(errno) ));
continue;
}
*mode = dos_mode(conn,pathreal,&sbuf);
if (!dir_check_ftype(conn,*mode,&sbuf,dirtype))
{
DEBUG(5,("[%s] attribs didn't match %x\n",filename,dirtype));
continue;
}
*size = sbuf.st_size;
*date = sbuf.st_mtime;
DEBUG(3,("get_dir_entry mask=[%s] found %s fname=%s\n",mask, pathreal,fname));
found = True;
}
}
return(found);
}
typedef struct
{
int pos;
int numentries;
int mallocsize;
char *data;
char *current;
} Dir;
/*******************************************************************
check to see if a user can read a file. This is only approximate,
it is used as part of the "hide unreadable" option. Don't
use it for anything security sensitive
********************************************************************/
static BOOL user_can_read_file(connection_struct *conn, char *name)
{
extern struct current_user current_user;
SMB_STRUCT_STAT ste;
SEC_DESC *psd = NULL;
size_t sd_size;
files_struct *fsp;
int smb_action;
NTSTATUS status;
uint32 access_granted;
ZERO_STRUCT(ste);
/* if we can't stat it does not show it */
if (vfs_stat(conn, name, &ste) != 0)
return False;
/* Pseudo-open the file (note - no fd's created). */
if(S_ISDIR(ste.st_mode))
fsp = open_directory(conn, name, &ste, SET_DENY_MODE(DENY_NONE), FILE_OPEN,
unix_mode(conn,aRONLY|aDIR, name), &smb_action);
else
fsp = open_file_stat(conn,name,&ste,DOS_OPEN_RDONLY,&smb_action);
if (!fsp)
return False;
/* Get NT ACL -allocated in main loop talloc context. No free needed here. */
sd_size = conn->vfs_ops.fget_nt_acl(fsp, fsp->fd, &psd);
close_file(fsp, True);
/* No access if SD get failed. */
if (!sd_size)
return False;
return se_access_check(psd, current_user.nt_user_token, FILE_READ_DATA,
&access_granted, &status);
#if 0
/* Old - crappy check :-). JRA */
if (ste.st_uid == conn->uid) {
return (ste.st_mode & S_IRUSR) == S_IRUSR;
} else {
int i;
if (ste.st_gid == conn->gid) {
return (ste.st_mode & S_IRGRP) == S_IRGRP;
}
for (i=0; i<conn->ngroups; i++) {
if (conn->groups[i] == ste.st_gid) {
return (ste.st_mode & S_IRGRP) == S_IRGRP;
}
}
}
return (ste.st_mode & S_IROTH) == S_IROTH;
#endif
}
/*******************************************************************
Open a directory.
********************************************************************/
void *OpenDir(connection_struct *conn, char *name, BOOL use_veto)
{
Dir *dirp;
char *n;
DIR *p = conn->vfs_ops.opendir(conn,name);
int used=0;
if (!p) return(NULL);
dirp = (Dir *)malloc(sizeof(Dir));
if (!dirp) {
DEBUG(0,("Out of memory in OpenDir\n"));
conn->vfs_ops.closedir(conn,p);
return(NULL);
}
dirp->pos = dirp->numentries = dirp->mallocsize = 0;
dirp->data = dirp->current = NULL;
while ((n = vfs_readdirname(conn, p)))
{
int l;
l = strlen(n)+1;
/* If it's a vetoed file, pretend it doesn't even exist */
if (use_veto && conn && IS_VETO_PATH(conn, n)) continue;
/* Honour _hide unreadable_ option */
if (conn && lp_hideunreadable(SNUM(conn))) {
char *entry;
int ret=0;
if (asprintf(&entry, "%s/%s/%s", conn->origpath, name, n) > 0) {
ret = user_can_read_file(conn, entry);
SAFE_FREE(entry);
}
if (!ret) continue;
}
if (used + l > dirp->mallocsize) {
int s = MAX(used+l,used+2000);
char *r;
r = (char *)Realloc(dirp->data,s);
if (!r) {
DEBUG(0,("Out of memory in OpenDir\n"));
break;
}
dirp->data = r;
dirp->mallocsize = s;
dirp->current = dirp->data;
}
pstrcpy(dirp->data+used,n);
used += l;
dirp->numentries++;
}
conn->vfs_ops.closedir(conn,p);
return((void *)dirp);
}
/*******************************************************************
Close a directory.
********************************************************************/
void CloseDir(void *p)
{
if (!p) return;
SAFE_FREE(((Dir *)p)->data);
SAFE_FREE(p);
}
/*******************************************************************
Read from a directory.
********************************************************************/
char *ReadDirName(void *p)
{
char *ret;
Dir *dirp = (Dir *)p;
if (!dirp || !dirp->current || dirp->pos >= dirp->numentries) return(NULL);
ret = dirp->current;
dirp->current = skip_string(dirp->current,1);
dirp->pos++;
return(ret);
}
/*******************************************************************
Seek a dir.
********************************************************************/
BOOL SeekDir(void *p,int pos)
{
Dir *dirp = (Dir *)p;
if (!dirp) return(False);
if (pos < dirp->pos) {
dirp->current = dirp->data;
dirp->pos = 0;
}
while (dirp->pos < pos && ReadDirName(p)) ;
return(dirp->pos == pos);
}
/*******************************************************************
Tell a dir position.
********************************************************************/
int TellDir(void *p)
{
Dir *dirp = (Dir *)p;
if (!dirp) return(-1);
return(dirp->pos);
}
/*******************************************************************************
This section manages a global directory cache.
(It should probably be split into a separate module. crh)
********************************************************************************/
typedef struct {
ubi_dlNode node;
char *path;
char *name;
char *dname;
int snum;
} dir_cache_entry;
static ubi_dlNewList( dir_cache );
/*****************************************************************************
Add an entry to the directory cache.
Input: path -
name -
dname -
snum -
Output: None.
*****************************************************************************/
void DirCacheAdd( char *path, char *name, char *dname, int snum )
{
int pathlen;
int namelen;
dir_cache_entry *entry;
/* Allocate the structure & string space in one go so that it can be freed
* in one call to free().
*/
pathlen = strlen( path ) +1; /* Bytes required to store path (with nul). */
namelen = strlen( name ) +1; /* Bytes required to store name (with nul). */
entry = (dir_cache_entry *)malloc( sizeof( dir_cache_entry )
+ pathlen
+ namelen
+ strlen( dname ) +1 );
if( NULL == entry ) /* Not adding to the cache is not fatal, */
return; /* so just return as if nothing happened. */
/* Set pointers correctly and load values. */
entry->path = pstrcpy( (char *)&entry[1], path);
entry->name = pstrcpy( &(entry->path[pathlen]), name);
entry->dname = pstrcpy( &(entry->name[namelen]), dname);
entry->snum = snum;
/* Add the new entry to the linked list. */
(void)ubi_dlAddHead( dir_cache, entry );
DEBUG( 4, ("Added dir cache entry %s %s -> %s\n", path, name, dname ) );
/* Free excess cache entries. */
while( DIRCACHESIZE < dir_cache->count )
safe_free( ubi_dlRemTail( dir_cache ) );
}
/*****************************************************************************
Search for an entry to the directory cache.
Input: path -
name -
snum -
Output: The dname string of the located entry, or NULL if the entry was
not found.
Notes: This uses a linear search, which is is okay because of
the small size of the cache. Use a splay tree or hash
for large caches.
*****************************************************************************/
char *DirCacheCheck( char *path, char *name, int snum )
{
dir_cache_entry *entry;
for( entry = (dir_cache_entry *)ubi_dlFirst( dir_cache );
NULL != entry;
entry = (dir_cache_entry *)ubi_dlNext( entry ) )
{
if( entry->snum == snum
&& 0 == strcmp( name, entry->name )
&& 0 == strcmp( path, entry->path ) )
{
DEBUG(4, ("Got dir cache hit on %s %s -> %s\n",path,name,entry->dname));
return( entry->dname );
}
}
return(NULL);
}
/*****************************************************************************
Remove all cache entries which have an snum that matches the input.
Input: snum -
Output: None.
*****************************************************************************/
void DirCacheFlush(int snum)
{
dir_cache_entry *entry;
ubi_dlNodePtr next;
for(entry = (dir_cache_entry *)ubi_dlFirst( dir_cache );
NULL != entry; ) {
next = ubi_dlNext( entry );
if( entry->snum == snum )
safe_free( ubi_dlRemThis( dir_cache, entry ) );
entry = (dir_cache_entry *)next;
}
}