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/*
* Unix SMB/CIFS implementation.
*
* Copyright (C) Volker Lendecke 2015
*
* 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_cleanupd.h"
#include "lib/util_procid.h"
#include "lib/util/tevent_ntstatus.h"
#include "lib/util/debug.h"
#include "smbprofile.h"
#include "serverid.h"
#include "locking/proto.h"
#include "cleanupdb.h"
struct smbd_cleanupd_state {
pid_t parent_pid;
};
static void smbd_cleanupd_shutdown(struct messaging_context *msg,
void *private_data, uint32_t msg_type,
struct server_id server_id,
DATA_BLOB *data);
static void smbd_cleanupd_process_exited(struct messaging_context *msg,
void *private_data, uint32_t msg_type,
struct server_id server_id,
DATA_BLOB *data);
struct tevent_req *smbd_cleanupd_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct messaging_context *msg,
pid_t parent_pid)
{
struct tevent_req *req;
struct smbd_cleanupd_state *state;
NTSTATUS status;
req = tevent_req_create(mem_ctx, &state, struct smbd_cleanupd_state);
if (req == NULL) {
return NULL;
}
state->parent_pid = parent_pid;
status = messaging_register(msg, req, MSG_SHUTDOWN,
smbd_cleanupd_shutdown);
if (tevent_req_nterror(req, status)) {
return tevent_req_post(req, ev);
}
status = messaging_register(msg, req, MSG_SMB_NOTIFY_CLEANUP,
smbd_cleanupd_process_exited);
if (tevent_req_nterror(req, status)) {
return tevent_req_post(req, ev);
}
return req;
}
static void smbd_cleanupd_shutdown(struct messaging_context *msg,
void *private_data, uint32_t msg_type,
struct server_id server_id,
DATA_BLOB *data)
{
struct tevent_req *req = talloc_get_type_abort(
private_data, struct tevent_req);
tevent_req_done(req);
}
struct cleanup_child {
struct cleanup_child *prev, *next;
pid_t pid;
bool unclean;
};
struct cleanupdb_traverse_state {
TALLOC_CTX *mem_ctx;
bool ok;
struct cleanup_child *children;
};
static int cleanupdb_traverse_fn(const pid_t pid,
const bool unclean,
void *private_data)
{
struct cleanupdb_traverse_state *cleanup_state =
(struct cleanupdb_traverse_state *)private_data;
struct cleanup_child *child = NULL;
child = talloc_zero(cleanup_state->mem_ctx, struct cleanup_child);
if (child == NULL) {
DBG_ERR("talloc_zero failed\n");
return -1;
}
child->pid = pid;
child->unclean = unclean;
DLIST_ADD(cleanup_state->children, child);
return 0;
}
static void smbd_cleanupd_process_exited(struct messaging_context *msg,
void *private_data, uint32_t msg_type,
struct server_id server_id,
DATA_BLOB *data)
{
struct tevent_req *req = talloc_get_type_abort(
private_data, struct tevent_req);
struct smbd_cleanupd_state *state = tevent_req_data(
req, struct smbd_cleanupd_state);
int ret;
struct cleanupdb_traverse_state cleanup_state;
TALLOC_CTX *frame = talloc_stackframe();
struct cleanup_child *child = NULL;
cleanup_state = (struct cleanupdb_traverse_state) {
.mem_ctx = frame
};
/*
* This merely collect children in a list, whatever we're
* supposed to cleanup for every child, it has to take place
* *after* the db traverse in a list loop. This is to minimize
* locking interaction between the traverse and writers (i.e.
* the parent smbd).
*/
ret = cleanupdb_traverse_read(cleanupdb_traverse_fn, &cleanup_state);
if (ret < 0) {
DBG_ERR("cleanupdb_traverse_read failed\n");
TALLOC_FREE(frame);
return;
}
if (ret == 0) {
TALLOC_FREE(frame);
return;
}
for (child = cleanup_state.children;
child != NULL;
child = child->next)
{
bool ok;
ok = cleanupdb_delete_child(child->pid);
if (!ok) {
DBG_ERR("failed to delete pid %d\n", (int)child->pid);
}
smbprofile_cleanup(child->pid, state->parent_pid);
ret = messaging_cleanup(msg, child->pid);
if ((ret != 0) && (ret != ENOENT)) {
DBG_DEBUG("messaging_cleanup returned %s\n",
strerror(ret));
}
DBG_DEBUG("cleaned up pid %d\n", (int)child->pid);
}
TALLOC_FREE(frame);
}
NTSTATUS smbd_cleanupd_recv(struct tevent_req *req)
{
return tevent_req_simple_recv_ntstatus(req);
}
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