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  * Close a specific file given a share entry.
  92  */
  93 #define MSG_SMB_CLOSE_FILE              0x0313
  94
  95 /* winbind messages */
  96 #define MSG_WINBIND_FINISHED            0x0401
  97 #define MSG_WINBIND_FORGET_STATE        0x0402
  98 #define MSG_WINBIND_ONLINE              0x0403
  99 #define MSG_WINBIND_OFFLINE             0x0404
 100 #define MSG_WINBIND_ONLINESTATUS        0x0405
 101 #define MSG_WINBIND_TRY_TO_GO_ONLINE    0x0406
 102 #define MSG_WINBIND_FAILED_TO_GO_ONLINE 0x0407
 103 #define MSG_WINBIND_VALIDATE_CACHE      0x0408
 104 #define MSG_WINBIND_DUMP_DOMAIN_LIST    0x0409
 105
 106 /* event messages */
 107 #define MSG_DUMP_EVENT_LIST             0x0500
 108
 109 /* dbwrap messages 4001-4999 */
 110 #define MSG_DBWRAP_TDB2_CHANGES         4001
 111
 112 /*
 113  * Special flags passed to message_send. Allocated from the top, lets see when
 114  * it collides with the message types in the lower 16 bits :-)
 115  */
 116
 117 /*
 118  * Under high load, this message can be dropped. Use for notify-style
 119  * messages that are not critical for correct operation.
 120  */
 121 #define MSG_FLAG_LOWPRIORITY            0x80000000
 122
 123
 124 /* Flags to classify messages - used in message_send_all() */
 125 /* Sender will filter by flag. */
 126
 127 #define FLAG_MSG_GENERAL                0x0001
 128 #define FLAG_MSG_SMBD                   0x0002
 129 #define FLAG_MSG_NMBD                   0x0004
 130 #define FLAG_MSG_PRINT_NOTIFY           0x0008
 131 #define FLAG_MSG_PRINT_GENERAL          0x0010
 132 /* dbwrap messages 4001-4999 */
 133 #define FLAG_MSG_DBWRAP                 0x0020
 134
 135
 136 /*
 137  * Virtual Node Numbers are identifying a node within a cluster. Ctdbd sets
 138  * this, we retrieve our vnn from it.
 139  */
 140
 141 #define NONCLUSTER_VNN (0xFFFFFFFF)
 142
 143 /*
 144  * ctdb gives us 64-bit server ids for messaging_send. This is done to avoid
 145  * pid clashes and to be able to register for special messages like "all
 146  * smbds".
 147  *
 148  * Normal individual server id's have the upper 32 bits to 0, I picked "1" for
 149  * Samba, other subsystems might use something else.
 150  */
 151
 152 #define MSG_SRVID_SAMBA 0x0000000100000000LL
 153
 154
 155 struct server_id {
 156         pid_t pid;
 157 #ifdef CLUSTER_SUPPORT
 158         uint32 vnn;
 159 #endif
 160 };
 161
 162 #ifdef CLUSTER_SUPPORT
 163 #define MSG_BROADCAST_PID_STR   "0:0"
 164 #else
 165 #define MSG_BROADCAST_PID_STR   "0"
 166 #endif
 167
 168 struct messaging_context;
 169 struct messaging_rec;
 170 struct data_blob;
 171
 172 /*
 173  * struct messaging_context belongs to messages.c, but because we still have
 174  * messaging_dispatch, we need it here. Once we get rid of signals for
 175  * notifying processes, this will go.
 176  */
 177
 178 struct messaging_context {
 179         struct server_id id;
 180         struct event_context *event_ctx;
 181         struct messaging_callback *callbacks;
 182
 183         struct messaging_backend *local;
 184         struct messaging_backend *remote;
 185 };
 186
 187 struct messaging_backend {
 188         NTSTATUS (*send_fn)(struct messaging_context *msg_ctx,
 189                             struct server_id pid, int msg_type,
 190                             const struct data_blob *data,
 191                             struct messaging_backend *backend);
 192         void *private_data;
 193 };
 194
 195 NTSTATUS messaging_tdb_init(struct messaging_context *msg_ctx,
 196                             TALLOC_CTX *mem_ctx,
 197                             struct messaging_backend **presult);
 198 void message_dispatch(struct messaging_context *msg_ctx);
 199
 200 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
 201                               TALLOC_CTX *mem_ctx,
 202                               struct messaging_backend **presult);
 203 struct ctdbd_connection *messaging_ctdbd_connection(void);
 204
 205 bool message_send_all(struct messaging_context *msg_ctx,
 206                       int msg_type,
 207                       const void *buf, size_t len,
 208                       int *n_sent);
 209 struct event_context *messaging_event_context(struct messaging_context *msg_ctx);
 210 struct messaging_context *messaging_init(TALLOC_CTX *mem_ctx,
 211                                          struct server_id server_id,
 212                                          struct event_context *ev);
 213
 214 /*
 215  * re-init after a fork
 216  */
 217 NTSTATUS messaging_reinit(struct messaging_context *msg_ctx);
 218
 219 NTSTATUS messaging_register(struct messaging_context *msg_ctx,
 220                             void *private_data,
 221                             uint32_t msg_type,
 222                             void (*fn)(struct messaging_context *msg,
 223                                        void *private_data,
 224                                        uint32_t msg_type,
 225                                        struct server_id server_id,
 226                                        struct data_blob *data));
 227 void messaging_deregister(struct messaging_context *ctx, uint32_t msg_type,
 228                           void *private_data);
 229 NTSTATUS messaging_send(struct messaging_context *msg_ctx,
 230                         struct server_id server,
 231                         uint32_t msg_type, const struct data_blob *data);
 232 NTSTATUS messaging_send_buf(struct messaging_context *msg_ctx,
 233                             struct server_id server, uint32_t msg_type,
 234                             const uint8 *buf, size_t len);
 235 void messaging_dispatch_rec(struct messaging_context *msg_ctx,
 236                             struct messaging_rec *rec);
 237
 238 #endif