source/include/messages.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3    messages.c header
   4    Copyright (C) Andrew Tridgell 2000
   5    Copyright (C) 2001, 2002 by Martin Pool
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #ifndef _MESSAGES_H_
  22 #define _MESSAGES_H_
  23
  24 /* change the message version with any incompatible changes in the protocol */
  25 #define MESSAGE_VERSION 2
  26
  27
  28 #define MSG_TYPE_MASK                   0xFFFF
  29
  30 /* general messages */
  31 #define MSG_DEBUG                       0x0001
  32 #define MSG_PING                        0x0002
  33 #define MSG_PONG                        0x0003
  34 #define MSG_PROFILE                     0x0004
  35 #define MSG_REQ_DEBUGLEVEL              0x0005
  36 #define MSG_DEBUGLEVEL                  0x0006
  37 #define MSG_REQ_PROFILELEVEL            0x0007
  38 #define MSG_PROFILELEVEL                0x0008
  39 #define MSG_REQ_POOL_USAGE              0x0009
  40 #define MSG_POOL_USAGE                  0x000A
  41
  42 /* If dmalloc is included, set a steady-state mark */
  43 #define MSG_REQ_DMALLOC_MARK            0x000B
  44
  45 /* If dmalloc is included, dump to the dmalloc log a description of
  46  * what has changed since the last MARK */
  47 #define MSG_REQ_DMALLOC_LOG_CHANGED     0x000C
  48
  49 #define MSG_SHUTDOWN                    0x000D
  50
  51 /* nmbd messages */
  52 #define MSG_FORCE_ELECTION              0x0101
  53 #define MSG_WINS_NEW_ENTRY              0x0102
  54 #define MSG_SEND_PACKET                 0x0103
  55
  56 /* printing messages */
  57 /* #define MSG_PRINTER_NOTIFY  2001*/ /* Obsolete */
  58 #define MSG_PRINTER_NOTIFY2             0x0202
  59
  60 #define MSG_PRINTER_DRVUPGRADE          0x0203
  61 #define MSG_PRINTERDATA_INIT_RESET      0x0204
  62 #define MSG_PRINTER_UPDATE              0x0205
  63 #define MSG_PRINTER_MOD                 0x0206
  64
  65 /* smbd messages */
  66 #define MSG_SMB_CONF_UPDATED            0x0301
  67 #define MSG_SMB_FORCE_TDIS              0x0302
  68 #define MSG_SMB_SAM_SYNC                0x0303
  69 #define MSG_SMB_SAM_REPL                0x0304
  70 #define MSG_SMB_UNLOCK                  0x0305
  71 #define MSG_SMB_BREAK_REQUEST           0x0306
  72 #define MSG_SMB_BREAK_RESPONSE          0x0307
  73 #define MSG_SMB_ASYNC_LEVEL2_BREAK      0x0308
  74 #define MSG_SMB_OPEN_RETRY              0x0309
  75 #define MSG_SMB_KERNEL_BREAK            0x030A
  76 #define MSG_SMB_FILE_RENAME             0x030B
  77 #define MSG_SMB_INJECT_FAULT            0x030C
  78 #define MSG_SMB_BLOCKING_LOCK_CANCEL    0x030D
  79 #define MSG_SMB_NOTIFY                  0x030E
  80 #define MSG_SMB_STAT_CACHE_DELETE       0x030F
  81 /*
  82  * Samba4 compatibility
  83  */
  84 #define MSG_PVFS_NOTIFY                 0x0310
  85 /*
  86  * cluster reconfigure events
  87  */
  88 #define MSG_SMB_BRL_VALIDATE            0x0311
  89 #define MSG_SMB_RELEASE_IP              0x0312
  90
  91 /* winbind messages */
  92 #define MSG_WINBIND_FINISHED            0x0401
  93 #define MSG_WINBIND_FORGET_STATE        0x0402
  94 #define MSG_WINBIND_ONLINE              0x0403
  95 #define MSG_WINBIND_OFFLINE             0x0404
  96 #define MSG_WINBIND_ONLINESTATUS        0x0405
  97 #define MSG_WINBIND_TRY_TO_GO_ONLINE    0x0406
  98 #define MSG_WINBIND_FAILED_TO_GO_ONLINE 0x0407
  99
 100 /* event messages */
 101 #define MSG_DUMP_EVENT_LIST             0x0500
 102
 103 /*
 104  * Special flags passed to message_send. Allocated from the top, lets see when
 105  * it collides with the message types in the lower 16 bits :-)
 106  */
 107
 108 /*
 109  * Under high load, this message can be dropped. Use for notify-style
 110  * messages that are not critical for correct operation.
 111  */
 112 #define MSG_FLAG_LOWPRIORITY            0x80000000
 113
 114
 115 /* Flags to classify messages - used in message_send_all() */
 116 /* Sender will filter by flag. */
 117
 118 #define FLAG_MSG_GENERAL                0x0001
 119 #define FLAG_MSG_SMBD                   0x0002
 120 #define FLAG_MSG_NMBD                   0x0004
 121 #define FLAG_MSG_PRINT_NOTIFY           0x0008
 122 #define FLAG_MSG_PRINT_GENERAL          0x0010
 123
 124
 125 /*
 126  * Virtual Node Numbers are identifying a node within a cluster. Ctdbd sets
 127  * this, we retrieve our vnn from it.
 128  */
 129
 130 #define NONCLUSTER_VNN (0xFFFFFFFF)
 131
 132 /*
 133  * ctdb gives us 64-bit server ids for messaging_send. This is done to avoid
 134  * pid clashes and to be able to register for special messages like "all
 135  * smbds".
 136  *
 137  * Normal individual server id's have the upper 32 bits to 0, I picked "1" for
 138  * Samba, other subsystems might use something else.
 139  */
 140
 141 #define MSG_SRVID_SAMBA 0x0000000100000000LL
 142
 143
 144 struct server_id {
 145         pid_t pid;
 146 #ifdef CLUSTER_SUPPORT
 147         uint32 vnn;
 148 #endif
 149 };
 150
 151
 152
 153 struct messaging_context;
 154 struct messaging_rec;
 155 struct data_blob;
 156
 157 /*
 158  * struct messaging_context belongs to messages.c, but because we still have
 159  * messaging_dispatch, we need it here. Once we get rid of signals for
 160  * notifying processes, this will go.
 161  */
 162
 163 struct messaging_context {
 164         struct server_id id;
 165         struct event_context *event_ctx;
 166         struct messaging_callback *callbacks;
 167
 168         struct messaging_backend *local;
 169         struct messaging_backend *remote;
 170 };
 171
 172 struct messaging_backend {
 173         NTSTATUS (*send_fn)(struct messaging_context *msg_ctx,
 174                             struct server_id pid, int msg_type,
 175                             const struct data_blob *data,
 176                             struct messaging_backend *backend);
 177         void *private_data;
 178 };
 179
 180 NTSTATUS messaging_tdb_init(struct messaging_context *msg_ctx,
 181                             TALLOC_CTX *mem_ctx,
 182                             struct messaging_backend **presult);
 183 void message_dispatch(struct messaging_context *msg_ctx);
 184
 185 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
 186                               TALLOC_CTX *mem_ctx,
 187                               struct messaging_backend **presult);
 188 struct ctdbd_connection *messaging_ctdbd_connection(void);
 189
 190 BOOL message_send_all(struct messaging_context *msg_ctx,
 191                       int msg_type,
 192                       const void *buf, size_t len,
 193                       int *n_sent);
 194 struct event_context *messaging_event_context(struct messaging_context *msg_ctx);
 195 struct messaging_context *messaging_init(TALLOC_CTX *mem_ctx,
 196                                          struct server_id server_id,
 197                                          struct event_context *ev);
 198
 199 /*
 200  * re-init after a fork
 201  */
 202 NTSTATUS messaging_reinit(struct messaging_context *msg_ctx);
 203
 204 NTSTATUS messaging_register(struct messaging_context *msg_ctx,
 205                             void *private_data,
 206                             uint32_t msg_type,
 207                             void (*fn)(struct messaging_context *msg,
 208                                        void *private_data,
 209                                        uint32_t msg_type,
 210                                        struct server_id server_id,
 211                                        struct data_blob *data));
 212 void messaging_deregister(struct messaging_context *ctx, uint32_t msg_type,
 213                           void *private_data);
 214 NTSTATUS messaging_send(struct messaging_context *msg_ctx,
 215                         struct server_id server,
 216                         uint32_t msg_type, const struct data_blob *data);
 217 NTSTATUS messaging_send_buf(struct messaging_context *msg_ctx,
 218                             struct server_id server, uint32_t msg_type,
 219                             const uint8 *buf, size_t len);
 220 void messaging_dispatch_rec(struct messaging_context *msg_ctx,
 221                             struct messaging_rec *rec);
 222
 223 #endif