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/*
Unix SMB/CIFS implementation.
messages.c header
Copyright (C) Andrew Tridgell 2000
Copyright (C) 2001, 2002 by Martin Pool
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/>.
*/
#ifndef _MESSAGES_H_
#define _MESSAGES_H_
/* change the message version with any incompatible changes in the protocol */
#define MESSAGE_VERSION 2
/*
* Special flags passed to message_send. Allocated from the top, lets see when
* it collides with the message types in the lower 16 bits :-)
*/
/*
* Under high load, this message can be dropped. Use for notify-style
* messages that are not critical for correct operation.
*/
#define MSG_FLAG_LOWPRIORITY 0x80000000
/* Flags to classify messages - used in message_send_all() */
/* Sender will filter by flag. */
#define FLAG_MSG_GENERAL 0x0001
#define FLAG_MSG_SMBD 0x0002
#define FLAG_MSG_NMBD 0x0004
#define FLAG_MSG_PRINT_NOTIFY 0x0008
#define FLAG_MSG_PRINT_GENERAL 0x0010
/* dbwrap messages 4001-4999 */
#define FLAG_MSG_DBWRAP 0x0020
/*
* Virtual Node Numbers are identifying a node within a cluster. Ctdbd sets
* this, we retrieve our vnn from it.
*/
#define NONCLUSTER_VNN (0xFFFFFFFF)
/*
* ctdb gives us 64-bit server ids for messaging_send. This is done to avoid
* pid clashes and to be able to register for special messages like "all
* smbds".
*
* Normal individual server id's have the upper 32 bits to 0, I picked "1" for
* Samba, other subsystems might use something else.
*/
#define MSG_SRVID_SAMBA 0x0000000100000000LL
struct server_id {
pid_t pid;
#ifdef CLUSTER_SUPPORT
uint32 vnn;
#endif
};
#ifdef CLUSTER_SUPPORT
#define MSG_BROADCAST_PID_STR "0:0"
#else
#define MSG_BROADCAST_PID_STR "0"
#endif
struct messaging_context;
struct messaging_rec;
struct data_blob;
/*
* struct messaging_context belongs to messages.c, but because we still have
* messaging_dispatch, we need it here. Once we get rid of signals for
* notifying processes, this will go.
*/
struct messaging_context {
struct server_id id;
struct event_context *event_ctx;
struct messaging_callback *callbacks;
struct messaging_backend *local;
struct messaging_backend *remote;
};
struct messaging_backend {
NTSTATUS (*send_fn)(struct messaging_context *msg_ctx,
struct server_id pid, int msg_type,
const struct data_blob *data,
struct messaging_backend *backend);
void *private_data;
};
NTSTATUS messaging_tdb_init(struct messaging_context *msg_ctx,
TALLOC_CTX *mem_ctx,
struct messaging_backend **presult);
void message_dispatch(struct messaging_context *msg_ctx);
NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
TALLOC_CTX *mem_ctx,
struct messaging_backend **presult);
struct ctdbd_connection *messaging_ctdbd_connection(void);
bool message_send_all(struct messaging_context *msg_ctx,
int msg_type,
const void *buf, size_t len,
int *n_sent);
struct event_context *messaging_event_context(struct messaging_context *msg_ctx);
struct messaging_context *messaging_init(TALLOC_CTX *mem_ctx,
struct server_id server_id,
struct event_context *ev);
/*
* re-init after a fork
*/
NTSTATUS messaging_reinit(struct messaging_context *msg_ctx);
NTSTATUS messaging_register(struct messaging_context *msg_ctx,
void *private_data,
uint32_t msg_type,
void (*fn)(struct messaging_context *msg,
void *private_data,
uint32_t msg_type,
struct server_id server_id,
struct data_blob *data));
void messaging_deregister(struct messaging_context *ctx, uint32_t msg_type,
void *private_data);
NTSTATUS messaging_send(struct messaging_context *msg_ctx,
struct server_id server,
uint32_t msg_type, const struct data_blob *data);
NTSTATUS messaging_send_buf(struct messaging_context *msg_ctx,
struct server_id server, uint32_t msg_type,
const uint8 *buf, size_t len);
void messaging_dispatch_rec(struct messaging_context *msg_ctx,
struct messaging_rec *rec);
#endif
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