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Are Casilla
2019-02-16 00:16:52 +01:00
parent 163fdd3d1b
commit 17b3af2911
2146 changed files with 678824 additions and 0 deletions
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Samba/source/ntvfs/sysdep/README
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This directory contains OS depdendent interfaces to facilities that
are only available on a few of our target systems, and require
substantial code to abstract.
Samba/source/ntvfs/sysdep/config.m4
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AC_CHECK_HEADERS(linux/inotify.h asm/unistd.h sys/inotify.h)
AC_CHECK_FUNC(inotify_init)
AC_HAVE_DECL(__NR_inotify_init, [#include <asm/unistd.h>])
SMB_ENABLE(sys_notify_inotify, NO)
if test x"$ac_cv_func_inotify_init" = x"yes" -a x"$ac_cv_header_sys_inotify_h" = x"yes"; then
SMB_ENABLE(sys_notify_inotify, YES)
fi
if test x"$ac_cv_func_inotify_init" = x"yes" -a x"$ac_cv_header_linux_inotify_h" = x"yes"; then
SMB_ENABLE(sys_notify_inotify, YES)
fi
if test x"$ac_cv_header_linux_inotify_h" = x"yes" -a x"$ac_cv_have___NR_inotify_init_decl" = x"yes"; then
SMB_ENABLE(sys_notify_inotify, YES)
fi
Samba/source/ntvfs/sysdep/config.mk
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################################################
# Start MODULE sys_notify_inotify
[MODULE::sys_notify_inotify]
SUBSYSTEM = sys_notify
INIT_FUNCTION = sys_notify_inotify_init
OBJ_FILES = \
inotify.o
# End MODULE sys_notify_inotify
################################################
################################################
# Start SUBSYSTEM sys_notify
[SUBSYSTEM::sys_notify]
OBJ_FILES = \
sys_notify.o
PUBLIC_DEPENDENCIES =
# End SUBSYSTEM sys_notify
################################################
Samba/source/ntvfs/sysdep/inotify.c
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/*
Unix SMB/CIFS implementation.
Copyright (C) Andrew Tridgell 2006
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.
*/
/*
notify implementation using inotify
*/
#include "includes.h"
#include "system/filesys.h"
#include "ntvfs/sysdep/sys_notify.h"
#include "lib/events/events.h"
#include "lib/util/dlinklist.h"
#include "libcli/raw/smb.h"
#if HAVE_SYS_INOTIFY_H
#include <sys/inotify.h>
#else
/* for older glibc varients - we can remove this eventually */
#include <linux/inotify.h>
#include <asm/unistd.h>
#ifndef HAVE_INOTIFY_INIT
/*
glibc doesn't define these functions yet (as of March 2006)
*/
static int inotify_init(void)
{
return syscall(__NR_inotify_init);
}
static int inotify_add_watch(int fd, const char *path, __u32 mask)
{
return syscall(__NR_inotify_add_watch, fd, path, mask);
}
static int inotify_rm_watch(int fd, int wd)
{
return syscall(__NR_inotify_rm_watch, fd, wd);
}
#endif
#endif
/* older glibc headers don't have these defines either */
#ifndef IN_ONLYDIR
#define IN_ONLYDIR 0x01000000
#endif
#ifndef IN_MASK_ADD
#define IN_MASK_ADD 0x20000000
#endif
struct inotify_private {
struct sys_notify_context *ctx;
int fd;
struct watch_context *watches;
};
struct watch_context {
struct watch_context *next, *prev;
struct inotify_private *in;
int wd;
sys_notify_callback_t callback;
void *private;
uint32_t mask; /* the inotify mask */
uint32_t filter; /* the windows completion filter */
const char *path;
};
/*
destroy the inotify private context
*/
static int inotify_destructor(struct inotify_private *in)
{
close(in->fd);
return 0;
}
/*
see if a particular event from inotify really does match a requested
notify event in SMB
*/
static BOOL filter_match(struct watch_context *w, struct inotify_event *e)
{
if ((e->mask & w->mask) == 0) {
/* this happens because inotify_add_watch() coalesces watches on the same
path, oring their masks together */
return False;
}
/* SMB separates the filters for files and directories */
if (e->mask & IN_ISDIR) {
if ((w->filter & FILE_NOTIFY_CHANGE_DIR_NAME) == 0) {
return False;
}
} else {
if ((e->mask & IN_ATTRIB) &&
(w->filter & (FILE_NOTIFY_CHANGE_ATTRIBUTES|
FILE_NOTIFY_CHANGE_LAST_WRITE|
FILE_NOTIFY_CHANGE_LAST_ACCESS|
FILE_NOTIFY_CHANGE_EA|
FILE_NOTIFY_CHANGE_SECURITY))) {
return True;
}
if ((e->mask & IN_MODIFY) &&
(w->filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)) {
return True;
}
if ((w->filter & FILE_NOTIFY_CHANGE_FILE_NAME) == 0) {
return False;
}
}
return True;
}
/*
dispatch one inotify event
the cookies are used to correctly handle renames
*/
static void inotify_dispatch(struct inotify_private *in,
struct inotify_event *e,
uint32_t prev_cookie,
struct inotify_event *e2)
{
struct watch_context *w, *next;
struct notify_event ne;
/* ignore extraneous events, such as unmount and IN_IGNORED events */
if ((e->mask & (IN_ATTRIB|IN_MODIFY|IN_CREATE|IN_DELETE|
IN_MOVED_FROM|IN_MOVED_TO)) == 0) {
return;
}
/* map the inotify mask to a action. This gets complicated for
renames */
if (e->mask & IN_CREATE) {
ne.action = NOTIFY_ACTION_ADDED;
} else if (e->mask & IN_DELETE) {
ne.action = NOTIFY_ACTION_REMOVED;
} else if (e->mask & IN_MOVED_FROM) {
if (e2 != NULL && e2->cookie == e->cookie) {
ne.action = NOTIFY_ACTION_OLD_NAME;
} else {
ne.action = NOTIFY_ACTION_REMOVED;
}
} else if (e->mask & IN_MOVED_TO) {
if (e->cookie == prev_cookie) {
ne.action = NOTIFY_ACTION_NEW_NAME;
} else {
ne.action = NOTIFY_ACTION_ADDED;
}
} else {
ne.action = NOTIFY_ACTION_MODIFIED;
}
ne.path = e->name;
/* find any watches that have this watch descriptor */
for (w=in->watches;w;w=next) {
next = w->next;
if (w->wd == e->wd && filter_match(w, e)) {
w->callback(in->ctx, w->private, &ne);
}
}
/* SMB expects a file rename to generate three events, two for
the rename and the other for a modify of the
destination. Strange! */
if (ne.action != NOTIFY_ACTION_NEW_NAME ||
(e->mask & IN_ISDIR) != 0) {
return;
}
ne.action = NOTIFY_ACTION_MODIFIED;
e->mask = IN_ATTRIB;
for (w=in->watches;w;w=next) {
next = w->next;
if (w->wd == e->wd && filter_match(w, e) &&
!(w->filter & FILE_NOTIFY_CHANGE_CREATION)) {
w->callback(in->ctx, w->private, &ne);
}
}
}
/*
called when the kernel has some events for us
*/
static void inotify_handler(struct event_context *ev, struct fd_event *fde,
uint16_t flags, void *private)
{
struct inotify_private *in = talloc_get_type(private, struct inotify_private);
int bufsize = 0;
struct inotify_event *e0, *e;
uint32_t prev_cookie=0;
/*
we must use FIONREAD as we cannot predict the length of the
filenames, and thus can't know how much to allocate
otherwise
*/
if (ioctl(in->fd, FIONREAD, &bufsize) != 0 ||
bufsize == 0) {
DEBUG(0,("No data on inotify fd?!\n"));
return;
}
e0 = e = talloc_size(in, bufsize);
if (e == NULL) return;
if (read(in->fd, e0, bufsize) != bufsize) {
DEBUG(0,("Failed to read all inotify data\n"));
talloc_free(e0);
return;
}
/* we can get more than one event in the buffer */
while (bufsize >= sizeof(*e)) {
struct inotify_event *e2 = NULL;
bufsize -= e->len + sizeof(*e);
if (bufsize >= sizeof(*e)) {
e2 = (struct inotify_event *)(e->len + sizeof(*e) + (char *)e);
}
inotify_dispatch(in, e, prev_cookie, e2);
prev_cookie = e->cookie;
e = e2;
}
talloc_free(e0);
}
/*
setup the inotify handle - called the first time a watch is added on
this context
*/
static NTSTATUS inotify_setup(struct sys_notify_context *ctx)
{
struct inotify_private *in;
if (!lp_parm_bool(-1, "notify", "inotify", True)) {
return NT_STATUS_INVALID_SYSTEM_SERVICE;
}
in = talloc(ctx, struct inotify_private);
NT_STATUS_HAVE_NO_MEMORY(in);
in->fd = inotify_init();
if (in->fd == -1) {
DEBUG(0,("Failed to init inotify - %s\n", strerror(errno)));
talloc_free(in);
return map_nt_error_from_unix(errno);
}
in->ctx = ctx;
in->watches = NULL;
ctx->private = in;
talloc_set_destructor(in, inotify_destructor);
/* add a event waiting for the inotify fd to be readable */
event_add_fd(ctx->ev, in, in->fd, EVENT_FD_READ, inotify_handler, in);
return NT_STATUS_OK;
}
/*
map from a change notify mask to a inotify mask. Remove any bits
which we can handle
*/
static const struct {
uint32_t notify_mask;
uint32_t inotify_mask;
} inotify_mapping[] = {
{FILE_NOTIFY_CHANGE_FILE_NAME, IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO},
{FILE_NOTIFY_CHANGE_DIR_NAME, IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO},
{FILE_NOTIFY_CHANGE_ATTRIBUTES, IN_ATTRIB|IN_MOVED_TO|IN_MOVED_FROM|IN_MODIFY},
{FILE_NOTIFY_CHANGE_LAST_WRITE, IN_ATTRIB},
{FILE_NOTIFY_CHANGE_LAST_ACCESS, IN_ATTRIB},
{FILE_NOTIFY_CHANGE_EA, IN_ATTRIB},
{FILE_NOTIFY_CHANGE_SECURITY, IN_ATTRIB}
};
static uint32_t inotify_map(struct notify_entry *e)
{
int i;
uint32_t out=0;
for (i=0;i<ARRAY_SIZE(inotify_mapping);i++) {
if (inotify_mapping[i].notify_mask & e->filter) {
out |= inotify_mapping[i].inotify_mask;
e->filter &= ~inotify_mapping[i].notify_mask;
}
}
return out;
}
/*
destroy a watch
*/
static int watch_destructor(struct watch_context *w)
{
struct inotify_private *in = w->in;
int wd = w->wd;
DLIST_REMOVE(w->in->watches, w);
/* only rm the watch if its the last one with this wd */
for (w=in->watches;w;w=w->next) {
if (w->wd == wd) break;
}
if (w == NULL) {
inotify_rm_watch(in->fd, wd);
}
return 0;
}
/*
add a watch. The watch is removed when the caller calls
talloc_free() on *handle
*/
static NTSTATUS inotify_watch(struct sys_notify_context *ctx, struct notify_entry *e,
sys_notify_callback_t callback, void *private,
void **handle)
{
struct inotify_private *in;
int wd;
uint32_t mask;
struct watch_context *w;
uint32_t filter = e->filter;
/* maybe setup the inotify fd */
if (ctx->private == NULL) {
NTSTATUS status;
status = inotify_setup(ctx);
NT_STATUS_NOT_OK_RETURN(status);
}
in = talloc_get_type(ctx->private, struct inotify_private);
mask = inotify_map(e);
if (mask == 0) {
/* this filter can't be handled by inotify */
return NT_STATUS_INVALID_PARAMETER;
}
/* using IN_MASK_ADD allows us to cope with inotify() returning the same
watch descriptor for muliple watches on the same path */
mask |= (IN_MASK_ADD | IN_ONLYDIR);
/* get a new watch descriptor for this path */
wd = inotify_add_watch(in->fd, e->path, mask);
if (wd == -1) {
e->filter = filter;
return map_nt_error_from_unix(errno);
}
w = talloc(in, struct watch_context);
if (w == NULL) {
inotify_rm_watch(in->fd, wd);
e->filter = filter;
return NT_STATUS_NO_MEMORY;
}
w->in = in;
w->wd = wd;
w->callback = callback;
w->private = private;
w->mask = mask;
w->filter = filter;
w->path = talloc_strdup(w, e->path);
if (w->path == NULL) {
inotify_rm_watch(in->fd, wd);
e->filter = filter;
return NT_STATUS_NO_MEMORY;
}
(*handle) = w;
DLIST_ADD(in->watches, w);
/* the caller frees the handle to stop watching */
talloc_set_destructor(w, watch_destructor);
return NT_STATUS_OK;
}
static struct sys_notify_backend inotify = {
.name = "inotify",
.notify_watch = inotify_watch
};
/*
initialialise the inotify module
*/
NTSTATUS sys_notify_inotify_init(void)
{
/* register ourselves as a system inotify module */
return sys_notify_register(&inotify);
}
Samba/source/ntvfs/sysdep/sys_notify.c
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/*
Unix SMB/CIFS implementation.
Copyright (C) Andrew Tridgell 2006
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.
*/
/*
abstract the various kernel interfaces to change notify into a
single Samba friendly interface
*/
#include "includes.h"
#include "system/filesys.h"
#include "ntvfs/sysdep/sys_notify.h"
#include "lib/events/events.h"
#include "lib/util/dlinklist.h"
#include "build.h"
/* list of registered backends */
static struct sys_notify_backend *backends;
static uint32_t num_backends;
#define NOTIFY_BACKEND "notify-backend"
/*
initialise a system change notify backend
*/
_PUBLIC_ struct sys_notify_context *sys_notify_context_create(struct share_config *scfg,
TALLOC_CTX *mem_ctx,
struct event_context *ev)
{
struct sys_notify_context *ctx;
const char *bname;
int i;
if (num_backends == 0) {
return NULL;
}
if (ev == NULL) {
ev = event_context_find(mem_ctx);
}
ctx = talloc_zero(mem_ctx, struct sys_notify_context);
if (ctx == NULL) {
return NULL;
}
ctx->ev = ev;
bname = share_string_option(scfg, NOTIFY_BACKEND, NULL);
if (!bname) {
if (num_backends) {
bname = backends[0].name;
} else {
bname = "__unknown__";
}
}
for (i=0;i<num_backends;i++) {
if (strcasecmp(backends[i].name, bname) == 0) {
bname = backends[i].name;
break;
}
}
ctx->name = bname;
ctx->notify_watch = NULL;
if (i < num_backends) {
ctx->notify_watch = backends[i].notify_watch;
}
return ctx;
}
/*
add a watch
note that this call must modify the e->filter and e->subdir_filter
bits to remove ones handled by this backend. Any remaining bits will
be handled by the generic notify layer
*/
_PUBLIC_ NTSTATUS sys_notify_watch(struct sys_notify_context *ctx, struct notify_entry *e,
sys_notify_callback_t callback, void *private, void **handle)
{
if (!ctx->notify_watch) {
return NT_STATUS_INVALID_SYSTEM_SERVICE;
}
return ctx->notify_watch(ctx, e, callback, private, handle);
}
/*
register a notify backend
*/
_PUBLIC_ NTSTATUS sys_notify_register(struct sys_notify_backend *backend)
{
struct sys_notify_backend *b;
b = talloc_realloc(talloc_autofree_context(), backends,
struct sys_notify_backend, num_backends+1);
NT_STATUS_HAVE_NO_MEMORY(b);
backends = b;
backends[num_backends] = *backend;
num_backends++;
return NT_STATUS_OK;
}
_PUBLIC_ NTSTATUS sys_notify_init(void)
{
static BOOL initialized = False;
init_module_fn static_init[] = STATIC_sys_notify_MODULES;
init_module_fn *shared_init;
if (initialized) return NT_STATUS_OK;
initialized = True;
shared_init = load_samba_modules(NULL, "sys_notify");
run_init_functions(static_init);
run_init_functions(shared_init);
talloc_free(shared_init);
return NT_STATUS_OK;
}
Samba/source/ntvfs/sysdep/sys_notify.h
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/*
Unix SMB/CIFS implementation.
Copyright (C) Andrew Tridgell 2006
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 "librpc/gen_ndr/notify.h"
#include "param/share.h"
struct sys_notify_context;
typedef void (*sys_notify_callback_t)(struct sys_notify_context *,
void *, struct notify_event *ev);
typedef NTSTATUS (*notify_watch_t)(struct sys_notify_context *ctx,
struct notify_entry *e,
sys_notify_callback_t callback, void *private,
void **handle);
struct sys_notify_context {
struct event_context *ev;
void *private; /* for use of backend */
const char *name;
notify_watch_t notify_watch;
};
struct sys_notify_backend {
const char *name;
notify_watch_t notify_watch;
};
NTSTATUS sys_notify_register(struct sys_notify_backend *backend);
struct sys_notify_context *sys_notify_context_create(struct share_config *scfg,
TALLOC_CTX *mem_ctx,
struct event_context *ev);
NTSTATUS sys_notify_watch(struct sys_notify_context *ctx, struct notify_entry *e,
sys_notify_callback_t callback, void *private,
void **handle);
NTSTATUS sys_notify_init(void);