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/*
* Unix SMB/CIFS implementation.
* Samba internal messaging functions
* Copyright (C) 2014 by Volker Lendecke
*
* 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 "replace.h"
#include <talloc.h>
#include "messages_dgm.h"
#include "messages_dgm_ref.h"
#include "lib/util/debug.h"
#include "lib/util/dlinklist.h"
struct msg_dgm_ref {
struct msg_dgm_ref *prev, *next;
struct messaging_dgm_fde *fde;
void (*recv_cb)(struct tevent_context *ev,
const uint8_t *msg, size_t msg_len,
int *fds, size_t num_fds, void *private_data);
void *recv_cb_private_data;
};
static pid_t dgm_pid = 0;
static struct msg_dgm_ref *refs = NULL;
static struct msg_dgm_ref *next_ref = NULL;
static int msg_dgm_ref_destructor(struct msg_dgm_ref *r);
static void msg_dgm_ref_recv(struct tevent_context *ev,
const uint8_t *msg, size_t msg_len,
int *fds, size_t num_fds, void *private_data);
void *messaging_dgm_ref(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
uint64_t *unique,
const char *socket_dir,
const char *lockfile_dir,
void (*recv_cb)(struct tevent_context *ev,
const uint8_t *msg, size_t msg_len,
int *fds, size_t num_fds,
void *private_data),
void *recv_cb_private_data,
int *err)
{
struct msg_dgm_ref *result, *tmp_refs;
result = talloc(mem_ctx, struct msg_dgm_ref);
if (result == NULL) {
*err = ENOMEM;
return NULL;
}
result->fde = NULL;
tmp_refs = refs;
if ((refs != NULL) && (dgm_pid != tevent_cached_getpid())) {
/*
* Have to reinit after fork
*/
messaging_dgm_destroy();
refs = NULL;
}
if (refs == NULL) {
int ret;
ret = messaging_dgm_init(ev, unique, socket_dir, lockfile_dir,
msg_dgm_ref_recv, NULL);
DBG_DEBUG("messaging_dgm_init returned %s\n", strerror(ret));
if (ret != 0) {
DEBUG(10, ("messaging_dgm_init failed: %s\n",
strerror(ret)));
TALLOC_FREE(result);
*err = ret;
return NULL;
}
dgm_pid = tevent_cached_getpid();
} else {
int ret;
ret = messaging_dgm_get_unique(tevent_cached_getpid(), unique);
DBG_DEBUG("messaging_dgm_get_unique returned %s\n",
strerror(ret));
if (ret != 0) {
TALLOC_FREE(result);
*err = ret;
return NULL;
}
}
result->fde = messaging_dgm_register_tevent_context(result, ev);
if (result->fde == NULL) {
TALLOC_FREE(result);
*err = ENOMEM;
return NULL;
}
DBG_DEBUG("unique = %"PRIu64"\n", *unique);
refs = tmp_refs;
result->recv_cb = recv_cb;
result->recv_cb_private_data = recv_cb_private_data;
DLIST_ADD(refs, result);
talloc_set_destructor(result, msg_dgm_ref_destructor);
return result;
}
static void msg_dgm_ref_recv(struct tevent_context *ev,
const uint8_t *msg, size_t msg_len,
int *fds, size_t num_fds, void *private_data)
{
struct msg_dgm_ref *r;
/*
* We have to broadcast incoming messages to all refs. The first ref
* that grabs the fd's will get them.
*/
for (r = refs; r != NULL; r = next_ref) {
bool active;
next_ref = r->next;
active = messaging_dgm_fde_active(r->fde);
if (!active) {
/*
* r's tevent_context has died.
*/
continue;
}
r->recv_cb(ev, msg, msg_len, fds, num_fds,
r->recv_cb_private_data);
}
}
static int msg_dgm_ref_destructor(struct msg_dgm_ref *r)
{
if (refs == NULL) {
abort();
}
if (r == next_ref) {
next_ref = r->next;
}
DLIST_REMOVE(refs, r);
TALLOC_FREE(r->fde);
DBG_DEBUG("refs=%p\n", refs);
if (refs == NULL) {
messaging_dgm_destroy();
}
return 0;
}
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