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wine/server/change.c
Jinoh Kang 9090229e67 server: Use the token owner instead of the token user for default object owner. 
Also, replace the token user with the token owner for the default DACL
as well.  Wine currently selects domain_users_sid as the token owner, so
use that.  This is required to pass the advapi32:security test which
expects the security descriptor owner SID to be referenced in the DACL
as well.
2022-07-20 22:33:44 +02:00

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/*
* Server-side change notification management
*
* Copyright (C) 1998 Alexandre Julliard
* Copyright (C) 2006 Mike McCormack
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <limits.h>
#include <dirent.h>
#include <errno.h>
#include <unistd.h>
#include <poll.h>
#ifdef HAVE_SYS_INOTIFY_H
#include <sys/inotify.h>
#endif
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "file.h"
#include "handle.h"
#include "thread.h"
#include "request.h"
#include "process.h"
#include "security.h"
#include "winternl.h"
/* dnotify support */
#ifdef linux
#ifndef F_NOTIFY
#define F_NOTIFY 1026
#define DN_ACCESS 0x00000001 /* File accessed */
#define DN_MODIFY 0x00000002 /* File modified */
#define DN_CREATE 0x00000004 /* File created */
#define DN_DELETE 0x00000008 /* File removed */
#define DN_RENAME 0x00000010 /* File renamed */
#define DN_ATTRIB 0x00000020 /* File changed attributes */
#define DN_MULTISHOT 0x80000000 /* Don't remove notifier */
#endif
#endif
/* inotify support */
struct inode;
static void free_inode( struct inode *inode );
static struct fd *inotify_fd;
struct change_record {
struct list entry;
unsigned int cookie;
struct filesystem_event event;
};
struct dir
{
struct object obj; /* object header */
struct fd *fd; /* file descriptor to the directory */
mode_t mode; /* file stat.st_mode */
uid_t uid; /* file stat.st_uid */
struct list entry; /* entry in global change notifications list */
unsigned int filter; /* notification filter */
volatile int notified; /* SIGIO counter */
int want_data; /* return change data */
int subtree; /* do we want to watch subdirectories? */
struct list change_records; /* data for the change */
struct list in_entry; /* entry in the inode dirs list */
struct inode *inode; /* inode of the associated directory */
struct process *client_process; /* client process that has a cache for this directory */
int client_entry; /* entry in client process cache */
};
static struct fd *dir_get_fd( struct object *obj );
static struct security_descriptor *dir_get_sd( struct object *obj );
static int dir_set_sd( struct object *obj, const struct security_descriptor *sd,
unsigned int set_info );
static void dir_dump( struct object *obj, int verbose );
static int dir_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
static void dir_destroy( struct object *obj );
static const struct object_ops dir_ops =
{
sizeof(struct dir), /* size */
&file_type, /* type */
dir_dump, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
default_fd_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
dir_get_fd, /* get_fd */
default_map_access, /* map_access */
dir_get_sd, /* get_sd */
dir_set_sd, /* set_sd */
no_get_full_name, /* get_full_name */
no_lookup_name, /* lookup_name */
no_link_name, /* link_name */
NULL, /* unlink_name */
no_open_file, /* open_file */
no_kernel_obj_list, /* get_kernel_obj_list */
dir_close_handle, /* close_handle */
dir_destroy /* destroy */
};
static int dir_get_poll_events( struct fd *fd );
static enum server_fd_type dir_get_fd_type( struct fd *fd );
static const struct fd_ops dir_fd_ops =
{
dir_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
dir_get_fd_type, /* get_fd_type */
no_fd_read, /* read */
no_fd_write, /* write */
no_fd_flush, /* flush */
default_fd_get_file_info, /* get_file_info */
no_fd_get_volume_info, /* get_volume_info */
default_fd_ioctl, /* ioctl */
default_fd_cancel_async, /* cancel_async */
default_fd_queue_async, /* queue_async */
default_fd_reselect_async /* reselect_async */
};
static struct list change_list = LIST_INIT(change_list);
/* per-process structure to keep track of cache entries on the client size */
struct dir_cache
{
unsigned int size;
unsigned int count;
unsigned char state[1];
};
enum dir_cache_state
{
DIR_CACHE_STATE_FREE,
DIR_CACHE_STATE_INUSE,
DIR_CACHE_STATE_RELEASED
};
/* return an array of cache entries that can be freed on the client side */
static int *get_free_dir_cache_entries( struct process *process, data_size_t *size )
{
int *ret;
struct dir_cache *cache = process->dir_cache;
unsigned int i, j, count;
if (!cache) return NULL;
for (i = count = 0; i < cache->count && count < *size / sizeof(*ret); i++)
if (cache->state[i] == DIR_CACHE_STATE_RELEASED) count++;
if (!count) return NULL;
if ((ret = malloc( count * sizeof(*ret) )))
{
for (i = j = 0; j < count; i++)
{
if (cache->state[i] != DIR_CACHE_STATE_RELEASED) continue;
cache->state[i] = DIR_CACHE_STATE_FREE;
ret[j++] = i;
}
*size = count * sizeof(*ret);
}
return ret;
}
/* allocate a new client-side directory cache entry */
static int alloc_dir_cache_entry( struct dir *dir, struct process *process )
{
unsigned int i = 0;
struct dir_cache *cache = process->dir_cache;
if (cache)
for (i = 0; i < cache->count; i++)
if (cache->state[i] == DIR_CACHE_STATE_FREE) goto found;
if (!cache || cache->count == cache->size)
{
unsigned int size = cache ? cache->size * 2 : 256;
if (!(cache = realloc( cache, offsetof( struct dir_cache, state[size] ))))
{
set_error( STATUS_NO_MEMORY );
return -1;
}
process->dir_cache = cache;
cache->size = size;
}
cache->count = i + 1;
found:
cache->state[i] = DIR_CACHE_STATE_INUSE;
return i;
}
/* release a directory cache entry; it will be freed on the client side on the next cache request */
static void release_dir_cache_entry( struct dir *dir )
{
struct dir_cache *cache;
if (!dir->client_process) return;
cache = dir->client_process->dir_cache;
cache->state[dir->client_entry] = DIR_CACHE_STATE_RELEASED;
release_object( dir->client_process );
dir->client_process = NULL;
}
static void dnotify_adjust_changes( struct dir *dir )
{
#if defined(F_SETSIG) && defined(F_NOTIFY)
int fd = get_unix_fd( dir->fd );
unsigned int filter = dir->filter;
unsigned int val;
if ( 0 > fcntl( fd, F_SETSIG, SIGIO) )
return;
val = DN_MULTISHOT;
if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
val |= DN_RENAME | DN_DELETE | DN_CREATE;
if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
val |= DN_RENAME | DN_DELETE | DN_CREATE;
if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
val |= DN_ATTRIB;
if (filter & FILE_NOTIFY_CHANGE_SIZE)
val |= DN_MODIFY;
if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
val |= DN_MODIFY;
if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
val |= DN_ACCESS;
if (filter & FILE_NOTIFY_CHANGE_CREATION)
val |= DN_CREATE;
if (filter & FILE_NOTIFY_CHANGE_SECURITY)
val |= DN_ATTRIB;
fcntl( fd, F_NOTIFY, val );
#endif
}
/* insert change in the global list */
static inline void insert_change( struct dir *dir )
{
sigset_t sigset;
sigemptyset( &sigset );
sigaddset( &sigset, SIGIO );
sigprocmask( SIG_BLOCK, &sigset, NULL );
list_add_head( &change_list, &dir->entry );
sigprocmask( SIG_UNBLOCK, &sigset, NULL );
}
/* remove change from the global list */
static inline void remove_change( struct dir *dir )
{
sigset_t sigset;
sigemptyset( &sigset );
sigaddset( &sigset, SIGIO );
sigprocmask( SIG_BLOCK, &sigset, NULL );
list_remove( &dir->entry );
sigprocmask( SIG_UNBLOCK, &sigset, NULL );
}
static void dir_dump( struct object *obj, int verbose )
{
struct dir *dir = (struct dir *)obj;
assert( obj->ops == &dir_ops );
fprintf( stderr, "Dirfile fd=%p filter=%08x\n", dir->fd, dir->filter );
}
/* enter here directly from SIGIO signal handler */
void do_change_notify( int unix_fd )
{
struct dir *dir;
/* FIXME: this is O(n) ... probably can be improved */
LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
{
if (get_unix_fd( dir->fd ) != unix_fd) continue;
dir->notified = 1;
break;
}
}
/* SIGIO callback, called synchronously with the poll loop */
void sigio_callback(void)
{
struct dir *dir;
LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
{
if (!dir->notified) continue;
dir->notified = 0;
fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_ALERTED );
}
}
static struct fd *dir_get_fd( struct object *obj )
{
struct dir *dir = (struct dir *)obj;
assert( obj->ops == &dir_ops );
return (struct fd *)grab_object( dir->fd );
}
static int get_dir_unix_fd( struct dir *dir )
{
return get_unix_fd( dir->fd );
}
static struct security_descriptor *dir_get_sd( struct object *obj )
{
struct dir *dir = (struct dir *)obj;
int unix_fd;
struct stat st;
struct security_descriptor *sd;
assert( obj->ops == &dir_ops );
unix_fd = get_dir_unix_fd( dir );
if (unix_fd == -1 || fstat( unix_fd, &st ) == -1)
return obj->sd;
/* mode and uid the same? if so, no need to re-generate security descriptor */
if (obj->sd &&
(st.st_mode & (S_IRWXU|S_IRWXO)) == (dir->mode & (S_IRWXU|S_IRWXO)) &&
(st.st_uid == dir->uid))
return obj->sd;
sd = mode_to_sd( st.st_mode,
security_unix_uid_to_sid( st.st_uid ),
token_get_primary_group( current->process->token ));
if (!sd) return obj->sd;
dir->mode = st.st_mode;
dir->uid = st.st_uid;
free( obj->sd );
obj->sd = sd;
return sd;
}
static int dir_set_sd( struct object *obj, const struct security_descriptor *sd,
unsigned int set_info )
{
struct dir *dir = (struct dir *)obj;
const struct sid *owner;
struct stat st;
mode_t mode;
int unix_fd;
assert( obj->ops == &dir_ops );
unix_fd = get_dir_unix_fd( dir );
if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 1;
if (set_info & OWNER_SECURITY_INFORMATION)
{
owner = sd_get_owner( sd );
if (!owner)
{
set_error( STATUS_INVALID_SECURITY_DESCR );
return 0;
}
if (!obj->sd || !equal_sid( owner, sd_get_owner( obj->sd ) ))
{
/* FIXME: get Unix uid and call fchown */
}
}
else if (obj->sd)
owner = sd_get_owner( obj->sd );
else
owner = token_get_owner( current->process->token );
if (set_info & DACL_SECURITY_INFORMATION)
{
/* keep the bits that we don't map to access rights in the ACL */
mode = st.st_mode & (S_ISUID|S_ISGID|S_ISVTX);
mode |= sd_to_mode( sd, owner );
if (((st.st_mode ^ mode) & (S_IRWXU|S_IRWXG|S_IRWXO)) && fchmod( unix_fd, mode ) == -1)
{
file_set_error();
return 0;
}
}
return 1;
}
static struct change_record *get_first_change_record( struct dir *dir )
{
struct list *ptr = list_head( &dir->change_records );
if (!ptr) return NULL;
list_remove( ptr );
return LIST_ENTRY( ptr, struct change_record, entry );
}
static int dir_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
{
struct dir *dir = (struct dir *)obj;
if (obj->handle_count == 1) release_dir_cache_entry( dir ); /* closing last handle, release cache */
return 1; /* ok to close */
}
static void dir_destroy( struct object *obj )
{
struct change_record *record;
struct dir *dir = (struct dir *)obj;
assert (obj->ops == &dir_ops);
if (dir->filter)
remove_change( dir );
if (dir->inode)
{
list_remove( &dir->in_entry );
free_inode( dir->inode );
}
while ((record = get_first_change_record( dir ))) free( record );
release_dir_cache_entry( dir );
release_object( dir->fd );
if (inotify_fd && list_empty( &change_list ))
{
release_object( inotify_fd );
inotify_fd = NULL;
}
}
struct dir *get_dir_obj( struct process *process, obj_handle_t handle, unsigned int access )
{
return (struct dir *)get_handle_obj( process, handle, access, &dir_ops );
}
static int dir_get_poll_events( struct fd *fd )
{
return 0;
}
static enum server_fd_type dir_get_fd_type( struct fd *fd )
{
return FD_TYPE_DIR;
}
#ifdef HAVE_SYS_INOTIFY_H
#define HASH_SIZE 31
struct inode {
struct list ch_entry; /* entry in the children list */
struct list children; /* children of this inode */
struct inode *parent; /* parent of this inode */
struct list dirs; /* directory handles watching this inode */
struct list ino_entry; /* entry in the inode hash */
struct list wd_entry; /* entry in the watch descriptor hash */
dev_t dev; /* device number */
ino_t ino; /* device's inode number */
int wd; /* inotify's watch descriptor */
char *name; /* basename name of the inode */
};
static struct list inode_hash[ HASH_SIZE ];
static struct list wd_hash[ HASH_SIZE ];
static int inotify_add_dir( char *path, unsigned int filter );
static struct inode *inode_from_wd( int wd )
{
struct list *bucket = &wd_hash[ wd % HASH_SIZE ];
struct inode *inode;
LIST_FOR_EACH_ENTRY( inode, bucket, struct inode, wd_entry )
if (inode->wd == wd)
return inode;
return NULL;
}
static inline struct list *get_hash_list( dev_t dev, ino_t ino )
{
return &inode_hash[ (ino ^ dev) % HASH_SIZE ];
}
static struct inode *find_inode( dev_t dev, ino_t ino )
{
struct list *bucket = get_hash_list( dev, ino );
struct inode *inode;
LIST_FOR_EACH_ENTRY( inode, bucket, struct inode, ino_entry )
if (inode->ino == ino && inode->dev == dev)
return inode;
return NULL;
}
static struct inode *create_inode( dev_t dev, ino_t ino )
{
struct inode *inode;
inode = malloc( sizeof *inode );
if (inode)
{
list_init( &inode->children );
list_init( &inode->dirs );
inode->ino = ino;
inode->dev = dev;
inode->wd = -1;
inode->parent = NULL;
inode->name = NULL;
list_add_tail( get_hash_list( dev, ino ), &inode->ino_entry );
}
return inode;
}
static struct inode *get_inode( dev_t dev, ino_t ino )
{
struct inode *inode;
inode = find_inode( dev, ino );
if (inode)
return inode;
return create_inode( dev, ino );
}
static void inode_set_wd( struct inode *inode, int wd )
{
if (inode->wd != -1)
list_remove( &inode->wd_entry );
inode->wd = wd;
list_add_tail( &wd_hash[ wd % HASH_SIZE ], &inode->wd_entry );
}
static void inode_set_name( struct inode *inode, const char *name )
{
free (inode->name);
inode->name = name ? strdup( name ) : NULL;
}
static void free_inode( struct inode *inode )
{
int subtree = 0, watches = 0;
struct inode *tmp, *next;
struct dir *dir;
LIST_FOR_EACH_ENTRY( dir, &inode->dirs, struct dir, in_entry )
{
subtree |= dir->subtree;
watches++;
}
if (!subtree && !inode->parent)
{
LIST_FOR_EACH_ENTRY_SAFE( tmp, next, &inode->children,
struct inode, ch_entry )
{
assert( tmp != inode );
assert( tmp->parent == inode );
free_inode( tmp );
}
}
if (watches)
return;
if (inode->parent)
list_remove( &inode->ch_entry );
/* disconnect remaining children from the parent */
LIST_FOR_EACH_ENTRY_SAFE( tmp, next, &inode->children, struct inode, ch_entry )
{
list_remove( &tmp->ch_entry );
tmp->parent = NULL;
}
if (inode->wd != -1)
{
inotify_rm_watch( get_unix_fd( inotify_fd ), inode->wd );
list_remove( &inode->wd_entry );
}
list_remove( &inode->ino_entry );
free( inode->name );
free( inode );
}
static struct inode *inode_add( struct inode *parent,
dev_t dev, ino_t ino, const char *name )
{
struct inode *inode;
inode = get_inode( dev, ino );
if (!inode)
return NULL;
if (!inode->parent)
{
list_add_tail( &parent->children, &inode->ch_entry );
inode->parent = parent;
assert( inode != parent );
}
inode_set_name( inode, name );
return inode;
}
static struct inode *inode_from_name( struct inode *inode, const char *name )
{
struct inode *i;
LIST_FOR_EACH_ENTRY( i, &inode->children, struct inode, ch_entry )
if (i->name && !strcmp( i->name, name ))
return i;
return NULL;
}
static int inotify_get_poll_events( struct fd *fd );
static void inotify_poll_event( struct fd *fd, int event );
static const struct fd_ops inotify_fd_ops =
{
inotify_get_poll_events, /* get_poll_events */
inotify_poll_event, /* poll_event */
NULL, /* flush */
NULL, /* get_fd_type */
NULL, /* ioctl */
NULL, /* queue_async */
NULL /* reselect_async */
};
static int inotify_get_poll_events( struct fd *fd )
{
return POLLIN;
}
static void inotify_do_change_notify( struct dir *dir, unsigned int action,
unsigned int cookie, const char *relpath )
{
struct change_record *record;
assert( dir->obj.ops == &dir_ops );
if (dir->want_data)
{
size_t len = strlen(relpath);
record = malloc( offsetof(struct change_record, event.name[len]) );
if (!record)
return;
record->cookie = cookie;
record->event.action = action;
memcpy( record->event.name, relpath, len );
record->event.len = len;
list_add_tail( &dir->change_records, &record->entry );
}
fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_ALERTED );
}
static unsigned int filter_from_event( struct inotify_event *ie )
{
unsigned int filter = 0;
if (ie->mask & (IN_MOVED_FROM | IN_MOVED_TO | IN_DELETE | IN_CREATE))
filter |= FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME;
if (ie->mask & IN_MODIFY)
filter |= FILE_NOTIFY_CHANGE_SIZE | FILE_NOTIFY_CHANGE_LAST_WRITE | FILE_NOTIFY_CHANGE_LAST_ACCESS;
if (ie->mask & IN_ATTRIB)
filter |= FILE_NOTIFY_CHANGE_ATTRIBUTES | FILE_NOTIFY_CHANGE_SECURITY;
if (ie->mask & IN_CREATE)
filter |= FILE_NOTIFY_CHANGE_CREATION;
if (ie->mask & IN_ISDIR)
filter &= ~FILE_NOTIFY_CHANGE_FILE_NAME;
else
filter &= ~FILE_NOTIFY_CHANGE_DIR_NAME;
return filter;
}
/* scan up the parent directories for watches */
static unsigned int filter_from_inode( struct inode *inode, int is_parent )
{
unsigned int filter = 0;
struct dir *dir;
/* combine filters from parents watching subtrees */
while (inode)
{
LIST_FOR_EACH_ENTRY( dir, &inode->dirs, struct dir, in_entry )
if (dir->subtree || !is_parent)
filter |= dir->filter;
is_parent = 1;
inode = inode->parent;
}
return filter;
}
static char *inode_get_path( struct inode *inode, int sz )
{
struct list *head;
char *path;
int len;
if (!inode)
return NULL;
head = list_head( &inode->dirs );
if (head)
{
int unix_fd = get_unix_fd( LIST_ENTRY( head, struct dir, in_entry )->fd );
path = malloc ( 32 + sz );
if (path)
sprintf( path, "/proc/self/fd/%u/", unix_fd );
return path;
}
if (!inode->name)
return NULL;
len = strlen( inode->name );
path = inode_get_path( inode->parent, sz + len + 1 );
if (!path)
return NULL;
strcat( path, inode->name );
strcat( path, "/" );
return path;
}
static void inode_check_dir( struct inode *parent, const char *name )
{
char *path;
unsigned int filter;
struct inode *inode;
struct stat st;
int wd = -1;
path = inode_get_path( parent, strlen(name) );
if (!path)
return;
strcat( path, name );
if (stat( path, &st ) < 0)
goto end;
filter = filter_from_inode( parent, 1 );
if (!filter)
goto end;
inode = inode_add( parent, st.st_dev, st.st_ino, name );
if (!inode || inode->wd != -1)
goto end;
wd = inotify_add_dir( path, filter );
if (wd != -1)
inode_set_wd( inode, wd );
else
free_inode( inode );
end:
free( path );
}
static int prepend( char **path, const char *segment )
{
int extra;
char *p;
extra = strlen( segment ) + 1;
if (*path)
{
int len = strlen( *path ) + 1;
p = realloc( *path, len + extra );
if (!p) return 0;
memmove( &p[ extra ], p, len );
p[ extra - 1 ] = '/';
memcpy( p, segment, extra - 1 );
}
else
{
p = malloc( extra );
if (!p) return 0;
memcpy( p, segment, extra );
}
*path = p;
return 1;
}
static void inotify_notify_all( struct inotify_event *ie )
{
unsigned int filter, action;
struct inode *inode, *i;
char *path = NULL;
struct dir *dir;
inode = inode_from_wd( ie->wd );
if (!inode)
{
fprintf( stderr, "no inode matches %d\n", ie->wd);
return;
}
filter = filter_from_event( ie );
if (ie->mask & IN_CREATE)
{
if (ie->mask & IN_ISDIR)
inode_check_dir( inode, ie->name );
action = FILE_ACTION_ADDED;
}
else if (ie->mask & IN_DELETE)
action = FILE_ACTION_REMOVED;
else if (ie->mask & IN_MOVED_FROM)
action = FILE_ACTION_RENAMED_OLD_NAME;
else if (ie->mask & IN_MOVED_TO)
action = FILE_ACTION_RENAMED_NEW_NAME;
else
action = FILE_ACTION_MODIFIED;
/*
* Work our way up the inode hierarchy
* extending the relative path as we go
* and notifying all recursive watches.
*/
if (!prepend( &path, ie->name ))
return;
for (i = inode; i; i = i->parent)
{
LIST_FOR_EACH_ENTRY( dir, &i->dirs, struct dir, in_entry )
if ((filter & dir->filter) && (i==inode || dir->subtree))
inotify_do_change_notify( dir, action, ie->cookie, path );
if (!i->name || !prepend( &path, i->name ))
break;
}
free( path );
if (ie->mask & IN_DELETE)
{
i = inode_from_name( inode, ie->name );
if (i)
free_inode( i );
}
}
static void inotify_poll_event( struct fd *fd, int event )
{
int r, ofs, unix_fd;
char buffer[0x1000];
struct inotify_event *ie;
unix_fd = get_unix_fd( fd );
r = read( unix_fd, buffer, sizeof buffer );
if (r < 0)
{
fprintf(stderr,"inotify_poll_event(): inotify read failed!\n");
return;
}
for( ofs = 0; ofs < r - offsetof(struct inotify_event, name); )
{
ie = (struct inotify_event*) &buffer[ofs];
ofs += offsetof( struct inotify_event, name[ie->len] );
if (ofs > r) break;
if (ie->len) inotify_notify_all( ie );
}
}
static inline struct fd *create_inotify_fd( void )
{
int unix_fd;
unix_fd = inotify_init();
if (unix_fd<0)
return NULL;
return create_anonymous_fd( &inotify_fd_ops, unix_fd, NULL, 0 );
}
static int map_flags( unsigned int filter )
{
unsigned int mask;
/* always watch these so we can track subdirectories in recursive watches */
mask = (IN_MOVED_FROM | IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF);
if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
mask |= IN_ATTRIB;
if (filter & FILE_NOTIFY_CHANGE_SIZE)
mask |= IN_MODIFY;
if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
mask |= IN_MODIFY;
if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
mask |= IN_MODIFY;
if (filter & FILE_NOTIFY_CHANGE_SECURITY)
mask |= IN_ATTRIB;
return mask;
}
static int inotify_add_dir( char *path, unsigned int filter )
{
int wd = inotify_add_watch( get_unix_fd( inotify_fd ),
path, map_flags( filter ) );
if (wd != -1)
set_fd_events( inotify_fd, POLLIN );
return wd;
}
static int init_inotify( void )
{
int i;
if (inotify_fd)
return 1;
inotify_fd = create_inotify_fd();
if (!inotify_fd)
return 0;
for (i=0; i<HASH_SIZE; i++)
{
list_init( &inode_hash[i] );
list_init( &wd_hash[i] );
}
return 1;
}
static int inotify_adjust_changes( struct dir *dir )
{
unsigned int filter;
struct inode *inode;
struct stat st;
char path[32];
int wd, unix_fd;
if (!inotify_fd)
return 0;
unix_fd = get_unix_fd( dir->fd );
inode = dir->inode;
if (!inode)
{
/* check if this fd is already being watched */
if (-1 == fstat( unix_fd, &st ))
return 0;
inode = get_inode( st.st_dev, st.st_ino );
if (!inode)
inode = create_inode( st.st_dev, st.st_ino );
if (!inode)
return 0;
list_add_tail( &inode->dirs, &dir->in_entry );
dir->inode = inode;
}
filter = filter_from_inode( inode, 0 );
sprintf( path, "/proc/self/fd/%u", unix_fd );
wd = inotify_add_dir( path, filter );
if (wd == -1) return 0;
inode_set_wd( inode, wd );
return 1;
}
static char *get_basename( const char *link )
{
char *buffer, *name = NULL;
int r, n = 0x100;
while (1)
{
buffer = malloc( n );
if (!buffer) return NULL;
r = readlink( link, buffer, n );
if (r < 0)
break;
if (r < n)
{
name = buffer;
break;
}
free( buffer );
n *= 2;
}
if (name)
{
while (r > 0 && name[ r - 1 ] == '/' )
r--;
name[ r ] = 0;
name = strrchr( name, '/' );
if (name)
name = strdup( &name[1] );
}
free( buffer );
return name;
}
static int dir_add_to_existing_notify( struct dir *dir )
{
struct inode *inode, *parent;
unsigned int filter = 0;
struct stat st, st_new;
char link[35], *name;
int wd, unix_fd;
if (!inotify_fd)
return 0;
unix_fd = get_unix_fd( dir->fd );
/* check if it's in the list of inodes we want to watch */
if (-1 == fstat( unix_fd, &st_new ))
return 0;
inode = find_inode( st_new.st_dev, st_new.st_ino );
if (inode)
return 0;
/* lookup the parent */
sprintf( link, "/proc/self/fd/%u/..", unix_fd );
if (-1 == stat( link, &st ))
return 0;
/*
* If there's no parent, stop. We could keep going adding
* ../ to the path until we hit the root of the tree or
* find a recursively watched ancestor.
* Assume it's too expensive to search up the tree for now.
*/
parent = find_inode( st.st_dev, st.st_ino );
if (!parent)
return 0;
if (parent->wd == -1)
return 0;
filter = filter_from_inode( parent, 1 );
if (!filter)
return 0;
sprintf( link, "/proc/self/fd/%u", unix_fd );
name = get_basename( link );
if (!name)
return 0;
inode = inode_add( parent, st_new.st_dev, st_new.st_ino, name );
free( name );
if (!inode)
return 0;
/* Couldn't find this inode at the start of the function, must be new */
assert( inode->wd == -1 );
wd = inotify_add_dir( link, filter );
if (wd != -1)
inode_set_wd( inode, wd );
return 1;
}
#else
static int init_inotify( void )
{
return 0;
}
static int inotify_adjust_changes( struct dir *dir )
{
return 0;
}
static void free_inode( struct inode *inode )
{
assert( 0 );
}
static int dir_add_to_existing_notify( struct dir *dir )
{
return 0;
}
#endif /* HAVE_SYS_INOTIFY_H */
struct object *create_dir_obj( struct fd *fd, unsigned int access, mode_t mode )
{
struct dir *dir;
dir = alloc_object( &dir_ops );
if (!dir)
return NULL;
list_init( &dir->change_records );
dir->filter = 0;
dir->notified = 0;
dir->want_data = 0;
dir->inode = NULL;
grab_object( fd );
dir->fd = fd;
dir->mode = mode;
dir->uid = ~(uid_t)0;
dir->client_process = NULL;
set_fd_user( fd, &dir_fd_ops, &dir->obj );
dir_add_to_existing_notify( dir );
return &dir->obj;
}
/* retrieve (or allocate) the client-side directory cache entry */
DECL_HANDLER(get_directory_cache_entry)
{
struct dir *dir;
int *free_entries;
data_size_t free_size;
if (!(dir = get_dir_obj( current->process, req->handle, 0 ))) return;
if (!dir->client_process)
{
if ((dir->client_entry = alloc_dir_cache_entry( dir, current->process )) == -1) goto done;
dir->client_process = (struct process *)grab_object( current->process );
}
if (dir->client_process == current->process) reply->entry = dir->client_entry;
else set_error( STATUS_SHARING_VIOLATION );
done: /* allow freeing entries even on failure */
free_size = get_reply_max_size();
free_entries = get_free_dir_cache_entries( current->process, &free_size );
if (free_entries) set_reply_data_ptr( free_entries, free_size );
release_object( dir );
}
/* enable change notifications for a directory */
DECL_HANDLER(read_directory_changes)
{
struct dir *dir;
struct async *async;
if (!req->filter)
{
set_error(STATUS_INVALID_PARAMETER);
return;
}
dir = get_dir_obj( current->process, req->async.handle, 0 );
if (!dir)
return;
/* requests don't timeout */
if (!(async = create_async( dir->fd, current, &req->async, NULL ))) goto end;
fd_queue_async( dir->fd, async, ASYNC_TYPE_WAIT );
/* assign it once */
if (!dir->filter)
{
init_inotify();
insert_change( dir );
dir->filter = req->filter;
dir->subtree = req->subtree;
dir->want_data = req->want_data;
}
/* if there's already a change in the queue, send it */
if (!list_empty( &dir->change_records ))
fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_ALERTED );
/* setup the real notification */
if (!inotify_adjust_changes( dir ))
dnotify_adjust_changes( dir );
set_error(STATUS_PENDING);
release_object( async );
end:
release_object( dir );
}
DECL_HANDLER(read_change)
{
struct change_record *record, *next;
struct dir *dir;
struct list events;
char *data, *event;
int size = 0;
dir = get_dir_obj( current->process, req->handle, 0 );
if (!dir)
return;
list_init( &events );
list_move_tail( &events, &dir->change_records );
release_object( dir );
if (list_empty( &events ))
{
set_error( STATUS_NO_DATA_DETECTED );
return;
}
LIST_FOR_EACH_ENTRY( record, &events, struct change_record, entry )
{
size += (offsetof(struct filesystem_event, name[record->event.len])
+ sizeof(int)-1) / sizeof(int) * sizeof(int);
}
if (size > get_reply_max_size())
set_error( STATUS_BUFFER_TOO_SMALL );
else if ((data = mem_alloc( size )) != NULL)
{
event = data;
LIST_FOR_EACH_ENTRY( record, &events, struct change_record, entry )
{
data_size_t len = offsetof( struct filesystem_event, name[record->event.len] );
/* FIXME: rename events are sometimes reported as delete/create */
if (record->event.action == FILE_ACTION_RENAMED_OLD_NAME)
{
struct list *elem = list_next( &events, &record->entry );
if (elem)
next = LIST_ENTRY(elem, struct change_record, entry);
if (elem && next->cookie == record->cookie)
next->cookie = 0;
else
record->event.action = FILE_ACTION_REMOVED;
}
else if (record->event.action == FILE_ACTION_RENAMED_NEW_NAME && record->cookie)
record->event.action = FILE_ACTION_ADDED;
memcpy( event, &record->event, len );
event += len;
if (len % sizeof(int))
{
memset( event, 0, sizeof(int) - len % sizeof(int) );
event += sizeof(int) - len % sizeof(int);
}
}
set_reply_data_ptr( data, size );
}
LIST_FOR_EACH_ENTRY_SAFE( record, next, &events, struct change_record, entry )
{
list_remove( &record->entry );
free( record );
}
}
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