diff options
Diffstat (limited to '')
| -rw-r--r-- | source3/smbd/notify.c | 913 |
1 files changed, 913 insertions, 0 deletions
diff --git a/source3/smbd/notify.c b/source3/smbd/notify.c new file mode 100644 index 0000000..c18ad00 --- /dev/null +++ b/source3/smbd/notify.c @@ -0,0 +1,913 @@ +/* + Unix SMB/CIFS implementation. + change notify handling + Copyright (C) Andrew Tridgell 2000 + Copyright (C) Jeremy Allison 1994-1998 + Copyright (C) Volker Lendecke 2007 + + 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 3 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, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" +#include "smbd/smbd.h" +#include "smbd/globals.h" +#include "../librpc/gen_ndr/ndr_notify.h" +#include "librpc/gen_ndr/ndr_file_id.h" +#include "libcli/security/privileges.h" +#include "libcli/security/security.h" + +struct notify_change_event { + struct timespec when; + uint32_t action; + const char *name; +}; + +struct notify_change_buf { + /* + * Filters for reinitializing after notifyd has been restarted + */ + uint32_t filter; + uint32_t subdir_filter; + + /* + * If no requests are pending, changes are queued here. Simple array, + * we only append. + */ + + uint32_t max_buffer_size; + + /* + * num_changes == -1 means that we have got a catch-all change, when + * asked we just return NT_STATUS_OK without specific changes. + */ + int num_changes; + struct notify_change_event *changes; + + /* + * If no changes are around requests are queued here. Using a linked + * list, because we have to append at the end and delete from the top. + */ + struct notify_change_request *requests; +}; + +struct notify_change_request { + struct notify_change_request *prev, *next; + struct files_struct *fsp; /* backpointer for cancel by mid */ + struct smb_request *req; + uint32_t filter; + uint32_t max_param; + void (*reply_fn)(struct smb_request *req, + NTSTATUS error_code, + uint8_t *buf, size_t len); + struct notify_mid_map *mid_map; + void *backend_data; +}; + +static void notify_fsp(files_struct *fsp, struct timespec when, + uint32_t action, const char *name); + +bool change_notify_fsp_has_changes(struct files_struct *fsp) +{ + if (fsp == NULL) { + return false; + } + + if (fsp->notify == NULL) { + return false; + } + + if (fsp->notify->num_changes == 0) { + return false; + } + + return true; +} + +/* + * For NTCancel, we need to find the notify_change_request indexed by + * mid. Separate list here. + */ + +struct notify_mid_map { + struct notify_mid_map *prev, *next; + struct notify_change_request *req; + uint64_t mid; +}; + +static bool notify_change_record_identical(struct notify_change_event *c1, + struct notify_change_event *c2) +{ + /* Note this is deliberately case sensitive. */ + if (c1->action == c2->action && + strcmp(c1->name, c2->name) == 0) { + return True; + } + return False; +} + +static int compare_notify_change_events(const void *p1, const void *p2) +{ + const struct notify_change_event *e1 = p1; + const struct notify_change_event *e2 = p2; + + return timespec_compare(&e1->when, &e2->when); +} + +static bool notify_marshall_changes(int num_changes, + uint32_t max_offset, + struct notify_change_event *changes, + DATA_BLOB *final_blob) +{ + int i; + + if (num_changes == -1) { + return false; + } + + /* + * Sort the notifies by timestamp when the event happened to avoid + * coalescing and thus dropping events. + */ + + qsort(changes, num_changes, + sizeof(*changes), compare_notify_change_events); + + for (i=0; i<num_changes; i++) { + enum ndr_err_code ndr_err; + struct notify_change_event *c; + struct FILE_NOTIFY_INFORMATION m; + DATA_BLOB blob; + uint16_t pad = 0; + + /* Coalesce any identical records. */ + while (i+1 < num_changes && + notify_change_record_identical(&changes[i], + &changes[i+1])) { + i++; + } + + c = &changes[i]; + + m.FileName1 = c->name; + m.FileNameLength = strlen_m(c->name)*2; + m.Action = c->action; + + m._pad = data_blob_null; + + /* + * Offset to next entry, only if there is one + */ + + if (i == (num_changes-1)) { + m.NextEntryOffset = 0; + } else { + if ((m.FileNameLength % 4) == 2) { + m._pad = data_blob_const(&pad, 2); + } + m.NextEntryOffset = + ndr_size_FILE_NOTIFY_INFORMATION(&m, 0); + } + + ndr_err = ndr_push_struct_blob(&blob, talloc_tos(), &m, + (ndr_push_flags_fn_t)ndr_push_FILE_NOTIFY_INFORMATION); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + return false; + } + + if (DEBUGLEVEL >= 10) { + NDR_PRINT_DEBUG(FILE_NOTIFY_INFORMATION, &m); + } + + if (!data_blob_append(talloc_tos(), final_blob, + blob.data, blob.length)) { + data_blob_free(&blob); + return false; + } + + data_blob_free(&blob); + + if (final_blob->length > max_offset) { + /* Too much data for client. */ + DEBUG(10, ("Client only wanted %d bytes, trying to " + "marshall %d bytes\n", (int)max_offset, + (int)final_blob->length)); + return False; + } + } + + return True; +} + +/**************************************************************************** + Setup the common parts of the return packet and send it. +*****************************************************************************/ + +void change_notify_reply(struct smb_request *req, + NTSTATUS error_code, + uint32_t max_param, + struct notify_change_buf *notify_buf, + void (*reply_fn)(struct smb_request *req, + NTSTATUS error_code, + uint8_t *buf, size_t len)) +{ + DATA_BLOB blob = data_blob_null; + + if (!NT_STATUS_IS_OK(error_code)) { + reply_fn(req, error_code, NULL, 0); + return; + } + + if (notify_buf == NULL) { + reply_fn(req, NT_STATUS_OK, NULL, 0); + return; + } + + max_param = MIN(max_param, notify_buf->max_buffer_size); + + if (!notify_marshall_changes(notify_buf->num_changes, max_param, + notify_buf->changes, &blob)) { + /* + * We exceed what the client is willing to accept. Send + * nothing. + */ + data_blob_free(&blob); + } + + reply_fn(req, NT_STATUS_OK, blob.data, blob.length); + + data_blob_free(&blob); + + TALLOC_FREE(notify_buf->changes); + notify_buf->num_changes = 0; +} + +struct notify_fsp_state { + struct files_struct *notified_fsp; + struct timespec when; + const struct notify_event *e; +}; + +static struct files_struct *notify_fsp_cb(struct files_struct *fsp, + void *private_data) +{ + struct notify_fsp_state *state = private_data; + + if (fsp == state->notified_fsp) { + DBG_DEBUG("notify_callback called for %s\n", fsp_str_dbg(fsp)); + notify_fsp(fsp, state->when, state->e->action, state->e->path); + return fsp; + } + + return NULL; +} + +void notify_callback(struct smbd_server_connection *sconn, + void *private_data, struct timespec when, + const struct notify_event *e) +{ + struct notify_fsp_state state = { + .notified_fsp = private_data, .when = when, .e = e + }; + files_forall(sconn, notify_fsp_cb, &state); +} + +NTSTATUS change_notify_create(struct files_struct *fsp, + uint32_t max_buffer_size, + uint32_t filter, + bool recursive) +{ + size_t len = fsp_fullbasepath(fsp, NULL, 0); + char fullpath[len+1]; + NTSTATUS status = NT_STATUS_NOT_IMPLEMENTED; + + /* + * Setting a changenotify needs READ/LIST access + * on the directory handle. + */ + if (!(fsp->access_mask & SEC_DIR_LIST)) { + return NT_STATUS_ACCESS_DENIED; + } + + if (fsp->notify != NULL) { + DEBUG(1, ("change_notify_create: fsp->notify != NULL, " + "fname = %s\n", fsp->fsp_name->base_name)); + return NT_STATUS_INVALID_PARAMETER; + } + + if (!(fsp->notify = talloc_zero(NULL, struct notify_change_buf))) { + DEBUG(0, ("talloc failed\n")); + return NT_STATUS_NO_MEMORY; + } + fsp->notify->filter = filter; + fsp->notify->subdir_filter = recursive ? filter : 0; + fsp->notify->max_buffer_size = max_buffer_size; + + fsp_fullbasepath(fsp, fullpath, sizeof(fullpath)); + + /* + * Avoid /. at the end of the path name. notify can't deal with it. + */ + if (len > 1 && fullpath[len-1] == '.' && fullpath[len-2] == '/') { + fullpath[len-2] = '\0'; + } + + if ((fsp->notify->filter != 0) || + (fsp->notify->subdir_filter != 0)) { + status = notify_add(fsp->conn->sconn->notify_ctx, + fullpath, fsp->notify->filter, + fsp->notify->subdir_filter, fsp); + } + + return status; +} + +NTSTATUS change_notify_add_request(struct smb_request *req, + uint32_t max_param, + uint32_t filter, bool recursive, + struct files_struct *fsp, + void (*reply_fn)(struct smb_request *req, + NTSTATUS error_code, + uint8_t *buf, size_t len)) +{ + struct notify_change_request *request = NULL; + struct notify_mid_map *map = NULL; + struct smbd_server_connection *sconn = req->sconn; + + DEBUG(10, ("change_notify_add_request: Adding request for %s: " + "max_param = %d\n", fsp_str_dbg(fsp), (int)max_param)); + + if (!(request = talloc(NULL, struct notify_change_request)) + || !(map = talloc(request, struct notify_mid_map))) { + TALLOC_FREE(request); + return NT_STATUS_NO_MEMORY; + } + + request->mid_map = map; + map->req = request; + + request->req = talloc_move(request, &req); + request->max_param = max_param; + request->filter = filter; + request->fsp = fsp; + request->reply_fn = reply_fn; + request->backend_data = NULL; + + DLIST_ADD_END(fsp->notify->requests, request); + + map->mid = request->req->mid; + DLIST_ADD(sconn->notify_mid_maps, map); + + return NT_STATUS_OK; +} + +static void change_notify_remove_request(struct smbd_server_connection *sconn, + struct notify_change_request *remove_req) +{ + files_struct *fsp; + struct notify_change_request *req; + + /* + * Paranoia checks, the fsp referenced must must have the request in + * its list of pending requests + */ + + fsp = remove_req->fsp; + SMB_ASSERT(fsp->notify != NULL); + + for (req = fsp->notify->requests; req; req = req->next) { + if (req == remove_req) { + break; + } + } + + if (req == NULL) { + smb_panic("notify_req not found in fsp's requests"); + } + + DLIST_REMOVE(fsp->notify->requests, req); + DLIST_REMOVE(sconn->notify_mid_maps, req->mid_map); + TALLOC_FREE(req); +} + +static void smbd_notify_cancel_by_map(struct notify_mid_map *map) +{ + struct smb_request *smbreq = map->req->req; + struct smbd_server_connection *sconn = smbreq->sconn; + struct smbd_smb2_request *smb2req = smbreq->smb2req; + NTSTATUS notify_status = NT_STATUS_CANCELLED; + + if (smb2req != NULL) { + NTSTATUS sstatus; + + if (smb2req->session == NULL) { + sstatus = NT_STATUS_USER_SESSION_DELETED; + } else { + sstatus = smb2req->session->status; + } + + if (NT_STATUS_EQUAL(sstatus, NT_STATUS_NETWORK_SESSION_EXPIRED)) { + sstatus = NT_STATUS_OK; + } + + if (!NT_STATUS_IS_OK(sstatus)) { + notify_status = NT_STATUS_NOTIFY_CLEANUP; + } else if (smb2req->tcon == NULL) { + notify_status = NT_STATUS_NOTIFY_CLEANUP; + } else if (!NT_STATUS_IS_OK(smb2req->tcon->status)) { + notify_status = NT_STATUS_NOTIFY_CLEANUP; + } + } + + change_notify_reply(smbreq, notify_status, + 0, NULL, map->req->reply_fn); + change_notify_remove_request(sconn, map->req); +} + +/**************************************************************************** + Delete entries by mid from the change notify pending queue. Always send reply. +*****************************************************************************/ + +bool remove_pending_change_notify_requests_by_mid( + struct smbd_server_connection *sconn, uint64_t mid) +{ + struct notify_mid_map *map; + + for (map = sconn->notify_mid_maps; map; map = map->next) { + if (map->mid == mid) { + break; + } + } + + if (map == NULL) { + return false; + } + + smbd_notify_cancel_by_map(map); + return true; +} + +void smbd_notify_cancel_by_smbreq(const struct smb_request *smbreq) +{ + struct smbd_server_connection *sconn = smbreq->sconn; + struct notify_mid_map *map; + + for (map = sconn->notify_mid_maps; map; map = map->next) { + if (map->req->req == smbreq) { + break; + } + } + + if (map == NULL) { + return; + } + + smbd_notify_cancel_by_map(map); +} + +static struct files_struct *smbd_notify_cancel_deleted_fn( + struct files_struct *fsp, void *private_data) +{ + struct file_id *fid = talloc_get_type_abort( + private_data, struct file_id); + + if (file_id_equal(&fsp->file_id, fid)) { + remove_pending_change_notify_requests_by_fid( + fsp, NT_STATUS_DELETE_PENDING); + } + return NULL; +} + +void smbd_notify_cancel_deleted(struct messaging_context *msg, + void *private_data, uint32_t msg_type, + struct server_id server_id, DATA_BLOB *data) +{ + struct smbd_server_connection *sconn = talloc_get_type_abort( + private_data, struct smbd_server_connection); + struct file_id *fid; + enum ndr_err_code ndr_err; + + fid = talloc(talloc_tos(), struct file_id); + if (fid == NULL) { + DEBUG(1, ("talloc failed\n")); + return; + } + + ndr_err = ndr_pull_struct_blob_all( + data, fid, fid, (ndr_pull_flags_fn_t)ndr_pull_file_id); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + DEBUG(10, ("%s: ndr_pull_file_id failed: %s\n", __func__, + ndr_errstr(ndr_err))); + goto done; + } + + files_forall(sconn, smbd_notify_cancel_deleted_fn, fid); + +done: + TALLOC_FREE(fid); +} + +static struct files_struct *smbd_notifyd_reregister(struct files_struct *fsp, + void *private_data) +{ + DBG_DEBUG("reregister %s\n", fsp->fsp_name->base_name); + + if ((fsp->conn->sconn->notify_ctx != NULL) && + (fsp->notify != NULL) && + ((fsp->notify->filter != 0) || + (fsp->notify->subdir_filter != 0))) { + size_t len = fsp_fullbasepath(fsp, NULL, 0); + char fullpath[len+1]; + + NTSTATUS status; + + fsp_fullbasepath(fsp, fullpath, sizeof(fullpath)); + if (len > 1 && fullpath[len-1] == '.' && + fullpath[len-2] == '/') { + fullpath[len-2] = '\0'; + } + + status = notify_add(fsp->conn->sconn->notify_ctx, + fullpath, fsp->notify->filter, + fsp->notify->subdir_filter, fsp); + if (!NT_STATUS_IS_OK(status)) { + DBG_DEBUG("notify_add failed: %s\n", + nt_errstr(status)); + } + } + return NULL; +} + +void smbd_notifyd_restarted(struct messaging_context *msg, + void *private_data, uint32_t msg_type, + struct server_id server_id, DATA_BLOB *data) +{ + struct smbd_server_connection *sconn = talloc_get_type_abort( + private_data, struct smbd_server_connection); + + TALLOC_FREE(sconn->notify_ctx); + + sconn->notify_ctx = notify_init(sconn, sconn->msg_ctx, + sconn, notify_callback); + if (sconn->notify_ctx == NULL) { + DBG_DEBUG("notify_init failed\n"); + return; + } + + files_forall(sconn, smbd_notifyd_reregister, sconn->notify_ctx); +} + +/**************************************************************************** + Delete entries by fnum from the change notify pending queue. +*****************************************************************************/ + +void remove_pending_change_notify_requests_by_fid(files_struct *fsp, + NTSTATUS status) +{ + if (fsp->notify == NULL) { + return; + } + + while (fsp->notify->requests != NULL) { + change_notify_reply(fsp->notify->requests->req, + status, 0, NULL, + fsp->notify->requests->reply_fn); + change_notify_remove_request(fsp->conn->sconn, + fsp->notify->requests); + } +} + +void notify_fname(connection_struct *conn, uint32_t action, uint32_t filter, + const char *path) +{ + struct notify_context *notify_ctx = conn->sconn->notify_ctx; + + if (path[0] == '.' && path[1] == '/') { + path += 2; + } + + notify_trigger(notify_ctx, action, filter, conn->connectpath, path); +} + +static bool user_can_stat_name_under_fsp(files_struct *fsp, const char *name) +{ + uint32_t rights; + struct smb_filename *fname = NULL; + char *filepath = NULL; + NTSTATUS status; + char *p = NULL; + + /* + * Assume we get filepath (relative to the share) + * like this: + * + * 'dir1/dir2/dir3/file' + * + * We start with LIST and TRAVERSE on the + * direct parent ('dir1/dir2/dir3') + * + * Then we switch to just TRAVERSE for + * the rest: 'dir1/dir2', 'dir1', '.' + * + * For a file in the share root, we'll have + * 'file' + * and would just check '.' with LIST and TRAVERSE. + * + * It's important to always check '.' as the last step, + * which means we check the permissions of the share root + * directory. + */ + + if (ISDOT(fsp->fsp_name->base_name)) { + filepath = talloc_strdup(talloc_tos(), name); + } else { + filepath = talloc_asprintf(talloc_tos(), + "%s/%s", + fsp->fsp_name->base_name, + name); + } + if (filepath == NULL) { + DBG_ERR("Memory allocation failed\n"); + return false; + } + + rights = SEC_DIR_LIST|SEC_DIR_TRAVERSE; + p = strrchr_m(filepath, '/'); + /* + * Check each path component, exluding the share root. + * + * We could check all components including root using + * a do { .. } while() loop, but IMHO the logic is clearer + * having the share root check separately afterwards. + */ + while (p != NULL) { + *p = '\0'; + status = synthetic_pathref(talloc_tos(), + fsp->conn->cwd_fsp, + filepath, + NULL, + NULL, + 0, + 0, + &fname); + if (!NT_STATUS_IS_OK(status)) { + DBG_ERR("synthetic_pathref failed for %s, error %s\n", + filepath, + nt_errstr(status)); + TALLOC_FREE(fname); + TALLOC_FREE(filepath); + return false; + } + + status = smbd_check_access_rights_fsp(fsp->conn->cwd_fsp, + fname->fsp, + false, + rights); + if (!NT_STATUS_IS_OK(status)) { + DBG_DEBUG("Access rights for %s/%s: %s\n", + fsp->conn->connectpath, + filepath, + nt_errstr(status)); + TALLOC_FREE(fname); + TALLOC_FREE(filepath); + return false; + } + + TALLOC_FREE(fname); + rights = SEC_DIR_TRAVERSE; + p = strrchr_m(filepath, '/'); + } + + TALLOC_FREE(filepath); + + /* Finally check share root. */ + filepath = talloc_strdup(talloc_tos(), "."); + if (filepath == NULL) { + DBG_ERR("Memory allocation failed\n"); + return false; + } + status = synthetic_pathref(talloc_tos(), + fsp->conn->cwd_fsp, + filepath, + NULL, + NULL, + 0, + 0, + &fname); + if (!NT_STATUS_IS_OK(status)) { + DBG_ERR("synthetic_pathref failed for %s, error %s\n", + filepath, + nt_errstr(status)); + TALLOC_FREE(fname); + TALLOC_FREE(filepath); + return false; + } + status = smbd_check_access_rights_fsp(fsp->conn->cwd_fsp, + fname->fsp, + false, + rights); + if (!NT_STATUS_IS_OK(status)) { + DBG_DEBUG("TRAVERSE access rights for %s failed with %s\n", + fsp->conn->connectpath, + nt_errstr(status)); + TALLOC_FREE(fname); + TALLOC_FREE(filepath); + return false; + } + TALLOC_FREE(fname); + TALLOC_FREE(filepath); + return true; +} + +static void notify_fsp(files_struct *fsp, struct timespec when, + uint32_t action, const char *name) +{ + struct notify_change_event *change, *changes; + char *tmp; + + if (fsp->notify == NULL) { + /* + * Nobody is waiting, don't queue + */ + return; + } + + if (lp_honor_change_notify_privilege(SNUM(fsp->conn))) { + bool has_sec_change_notify_privilege; + bool expose = false; + + has_sec_change_notify_privilege = security_token_has_privilege( + fsp->conn->session_info->security_token, + SEC_PRIV_CHANGE_NOTIFY); + + if (has_sec_change_notify_privilege) { + expose = true; + } else { + bool ok; + + ok = become_user_without_service_by_fsp(fsp); + if (ok) { + expose = user_can_stat_name_under_fsp(fsp, name); + unbecome_user_without_service(); + } + } + DBG_DEBUG("has_sec_change_notify_privilege=%s " + "expose=%s for %s notify %s\n", + has_sec_change_notify_privilege ? "true" : "false", + expose ? "true" : "false", + fsp->fsp_name->base_name, name); + if (!expose) { + return; + } + } + + /* + * Someone has triggered a notify previously, queue the change for + * later. + */ + + if ((fsp->notify->num_changes > 1000) || (name == NULL)) { + /* + * The real number depends on the client buf, just provide a + * guard against a DoS here. If name == NULL the CN backend is + * alerting us to a problem. Possibly dropped events. Clear + * queued changes and send the catch-all response to the client + * if a request is pending. + */ + TALLOC_FREE(fsp->notify->changes); + fsp->notify->num_changes = -1; + if (fsp->notify->requests != NULL) { + change_notify_reply(fsp->notify->requests->req, + NT_STATUS_OK, + fsp->notify->requests->max_param, + fsp->notify, + fsp->notify->requests->reply_fn); + change_notify_remove_request(fsp->conn->sconn, + fsp->notify->requests); + } + return; + } + + /* If we've exceeded the server side queue or received a NULL name + * from the underlying CN implementation, don't queue up any more + * requests until we can send a catch-all response to the client */ + if (fsp->notify->num_changes == -1) { + return; + } + + if (!(changes = talloc_realloc( + fsp->notify, fsp->notify->changes, + struct notify_change_event, + fsp->notify->num_changes+1))) { + DEBUG(0, ("talloc_realloc failed\n")); + return; + } + + fsp->notify->changes = changes; + + change = &(fsp->notify->changes[fsp->notify->num_changes]); + + if (!(tmp = talloc_strdup(changes, name))) { + DEBUG(0, ("talloc_strdup failed\n")); + return; + } + + string_replace(tmp, '/', '\\'); + change->name = tmp; + + change->when = when; + change->action = action; + fsp->notify->num_changes += 1; + + if (fsp->notify->requests == NULL) { + /* + * Nobody is waiting, so don't send anything. The ot + */ + return; + } + + if (action == NOTIFY_ACTION_OLD_NAME) { + /* + * We have to send the two rename events in one reply. So hold + * the first part back. + */ + return; + } + + /* + * Someone is waiting for the change, trigger the reply immediately. + * + * TODO: do we have to walk the lists of requests pending? + */ + + change_notify_reply(fsp->notify->requests->req, + NT_STATUS_OK, + fsp->notify->requests->max_param, + fsp->notify, + fsp->notify->requests->reply_fn); + + change_notify_remove_request(fsp->conn->sconn, fsp->notify->requests); +} + +char *notify_filter_string(TALLOC_CTX *mem_ctx, uint32_t filter) +{ + char *result = NULL; + + result = talloc_strdup(mem_ctx, ""); + + if (filter & FILE_NOTIFY_CHANGE_FILE_NAME) + result = talloc_asprintf_append(result, "FILE_NAME|"); + if (filter & FILE_NOTIFY_CHANGE_DIR_NAME) + result = talloc_asprintf_append(result, "DIR_NAME|"); + if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES) + result = talloc_asprintf_append(result, "ATTRIBUTES|"); + if (filter & FILE_NOTIFY_CHANGE_SIZE) + result = talloc_asprintf_append(result, "SIZE|"); + if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE) + result = talloc_asprintf_append(result, "LAST_WRITE|"); + if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS) + result = talloc_asprintf_append(result, "LAST_ACCESS|"); + if (filter & FILE_NOTIFY_CHANGE_CREATION) + result = talloc_asprintf_append(result, "CREATION|"); + if (filter & FILE_NOTIFY_CHANGE_EA) + result = talloc_asprintf_append(result, "EA|"); + if (filter & FILE_NOTIFY_CHANGE_SECURITY) + result = talloc_asprintf_append(result, "SECURITY|"); + if (filter & FILE_NOTIFY_CHANGE_STREAM_NAME) + result = talloc_asprintf_append(result, "STREAM_NAME|"); + if (filter & FILE_NOTIFY_CHANGE_STREAM_SIZE) + result = talloc_asprintf_append(result, "STREAM_SIZE|"); + if (filter & FILE_NOTIFY_CHANGE_STREAM_WRITE) + result = talloc_asprintf_append(result, "STREAM_WRITE|"); + + if (result == NULL) return NULL; + if (*result == '\0') return result; + + result[strlen(result)-1] = '\0'; + return result; +} + +struct sys_notify_context *sys_notify_context_create(TALLOC_CTX *mem_ctx, + struct tevent_context *ev) +{ + struct sys_notify_context *ctx; + + if (!(ctx = talloc(mem_ctx, struct sys_notify_context))) { + DEBUG(0, ("talloc failed\n")); + return NULL; + } + + ctx->ev = ev; + ctx->private_data = NULL; + return ctx; +} |