ctdb/protocol/protocol_message.c

   1 /*
   2    CTDB protocol marshalling
   3
   4    Copyright (C) Amitay Isaacs  2015
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "replace.h"
  21 #include "system/network.h"
  22
  23 #include <talloc.h>
  24 #include <tdb.h>
  25
  26 #include "protocol.h"
  27 #include "protocol_api.h"
  28 #include "protocol_private.h"
  29
  30
  31 static size_t ctdb_message_data_len(union ctdb_message_data *mdata,
  32                                     uint64_t srvid)
  33 {
  34         size_t len = 0;
  35
  36         switch (srvid) {
  37         case CTDB_SRVID_BANNING:
  38                 len = ctdb_uint32_len(&mdata->pnn);
  39                 break;
  40
  41         case CTDB_SRVID_ELECTION:
  42                 len = ctdb_election_message_len(mdata->election);
  43                 break;
  44
  45         case CTDB_SRVID_LEADER:
  46                 len = ctdb_uint32_len(&mdata->pnn);
  47                 break;
  48
  49         case CTDB_SRVID_RECONFIGURE:
  50                 break;
  51
  52         case CTDB_SRVID_RELEASE_IP:
  53                 len = ctdb_string_len(&mdata->ipaddr);
  54                 break;
  55
  56         case CTDB_SRVID_TAKE_IP:
  57                 len = ctdb_string_len(&mdata->ipaddr);
  58                 break;
  59
  60         case CTDB_SRVID_SET_NODE_FLAGS:
  61                 len = ctdb_node_flag_change_len(mdata->flag_change);
  62                 break;
  63
  64         case CTDB_SRVID_RECD_UPDATE_IP:
  65                 len = ctdb_public_ip_len(mdata->pubip);
  66                 break;
  67
  68         case CTDB_SRVID_VACUUM_FETCH:
  69                 len = ctdb_rec_buffer_len(mdata->recbuf);
  70                 break;
  71
  72         case CTDB_SRVID_DETACH_DATABASE:
  73                 len = ctdb_uint32_len(&mdata->db_id);
  74                 break;
  75
  76         case CTDB_SRVID_MEM_DUMP:
  77                 len = ctdb_srvid_message_len(mdata->msg);
  78                 break;
  79
  80         case CTDB_SRVID_GETLOG:
  81                 break;
  82
  83         case CTDB_SRVID_CLEARLOG:
  84                 break;
  85
  86         case CTDB_SRVID_PUSH_NODE_FLAGS:
  87                 len = ctdb_node_flag_change_len(mdata->flag_change);
  88                 break;
  89
  90         case CTDB_SRVID_RELOAD_NODES:
  91                 break;
  92
  93         case CTDB_SRVID_TAKEOVER_RUN:
  94                 len = ctdb_srvid_message_len(mdata->msg);
  95                 break;
  96
  97         case CTDB_SRVID_REBALANCE_NODE:
  98                 len = ctdb_uint32_len(&mdata->pnn);
  99                 break;
 100
 101         case CTDB_SRVID_DISABLE_TAKEOVER_RUNS:
 102                 len = ctdb_disable_message_len(mdata->disable);
 103                 break;
 104
 105         case CTDB_SRVID_DISABLE_RECOVERIES:
 106                 len = ctdb_disable_message_len(mdata->disable);
 107                 break;
 108
 109         case CTDB_SRVID_DISABLE_IP_CHECK:
 110                 len = ctdb_uint32_len(&mdata->timeout);
 111                 break;
 112
 113         default:
 114                 len = ctdb_tdb_data_len(&mdata->data);
 115                 break;
 116         }
 117
 118         return len;
 119 }
 120
 121 static void ctdb_message_data_push(union ctdb_message_data *mdata,
 122                                    uint64_t srvid, uint8_t *buf,
 123                                    size_t *npush)
 124 {
 125         size_t np = 0;
 126
 127         switch (srvid) {
 128         case CTDB_SRVID_BANNING:
 129                 ctdb_uint32_push(&mdata->pnn, buf, &np);
 130                 break;
 131
 132         case CTDB_SRVID_ELECTION:
 133                 ctdb_election_message_push(mdata->election, buf, &np);
 134                 break;
 135
 136         case CTDB_SRVID_LEADER:
 137                 ctdb_uint32_push(&mdata->pnn, buf, &np);
 138                 break;
 139
 140         case CTDB_SRVID_RECONFIGURE:
 141                 break;
 142
 143         case CTDB_SRVID_RELEASE_IP:
 144                 ctdb_string_push(&mdata->ipaddr, buf, &np);
 145                 break;
 146
 147         case CTDB_SRVID_TAKE_IP:
 148                 ctdb_string_push(&mdata->ipaddr, buf, &np);
 149                 break;
 150
 151         case CTDB_SRVID_SET_NODE_FLAGS:
 152                 ctdb_node_flag_change_push(mdata->flag_change, buf, &np);
 153                 break;
 154
 155         case CTDB_SRVID_RECD_UPDATE_IP:
 156                 ctdb_public_ip_push(mdata->pubip, buf, &np);
 157                 break;
 158
 159         case CTDB_SRVID_VACUUM_FETCH:
 160                 ctdb_rec_buffer_push(mdata->recbuf, buf, &np);
 161                 break;
 162
 163         case CTDB_SRVID_DETACH_DATABASE:
 164                 ctdb_uint32_push(&mdata->db_id, buf, &np);
 165                 break;
 166
 167         case CTDB_SRVID_MEM_DUMP:
 168                 ctdb_srvid_message_push(mdata->msg, buf, &np);
 169                 break;
 170
 171         case CTDB_SRVID_GETLOG:
 172                 break;
 173
 174         case CTDB_SRVID_CLEARLOG:
 175                 break;
 176
 177         case CTDB_SRVID_PUSH_NODE_FLAGS:
 178                 ctdb_node_flag_change_push(mdata->flag_change, buf, &np);
 179                 break;
 180
 181         case CTDB_SRVID_RELOAD_NODES:
 182                 break;
 183
 184         case CTDB_SRVID_TAKEOVER_RUN:
 185                 ctdb_srvid_message_push(mdata->msg, buf, &np);
 186                 break;
 187
 188         case CTDB_SRVID_REBALANCE_NODE:
 189                 ctdb_uint32_push(&mdata->pnn, buf, &np);
 190                 break;
 191
 192         case CTDB_SRVID_DISABLE_TAKEOVER_RUNS:
 193                 ctdb_disable_message_push(mdata->disable, buf, &np);
 194                 break;
 195
 196         case CTDB_SRVID_DISABLE_RECOVERIES:
 197                 ctdb_disable_message_push(mdata->disable, buf, &np);
 198                 break;
 199
 200         case CTDB_SRVID_DISABLE_IP_CHECK:
 201                 ctdb_uint32_push(&mdata->timeout, buf, &np);
 202                 break;
 203
 204         default:
 205                 ctdb_tdb_data_push(&mdata->data, buf, &np);
 206                 break;
 207         }
 208
 209         *npush = np;
 210 }
 211
 212 static int ctdb_message_data_pull(uint8_t *buf, size_t buflen,
 213                                   uint64_t srvid, TALLOC_CTX *mem_ctx,
 214                                   union ctdb_message_data *mdata,
 215                                   size_t *npull)
 216 {
 217         int ret = 0;
 218         size_t np = 0;
 219
 220         switch (srvid) {
 221         case CTDB_SRVID_BANNING:
 222                 ret = ctdb_uint32_pull(buf, buflen, &mdata->pnn, &np);
 223                 break;
 224
 225         case CTDB_SRVID_ELECTION:
 226                 ret = ctdb_election_message_pull(buf, buflen, mem_ctx,
 227                                                  &mdata->election, &np);
 228                 break;
 229
 230         case CTDB_SRVID_LEADER:
 231                 ret = ctdb_uint32_pull(buf, buflen, &mdata->pnn, &np);
 232                 break;
 233
 234         case CTDB_SRVID_RECONFIGURE:
 235                 break;
 236
 237         case CTDB_SRVID_RELEASE_IP:
 238                 ret = ctdb_string_pull(buf, buflen, mem_ctx, &mdata->ipaddr,
 239                                        &np);
 240                 break;
 241
 242         case CTDB_SRVID_TAKE_IP:
 243                 ret = ctdb_string_pull(buf, buflen, mem_ctx, &mdata->ipaddr,
 244                                        &np);
 245                 break;
 246
 247         case CTDB_SRVID_SET_NODE_FLAGS:
 248                 ret = ctdb_node_flag_change_pull(buf, buflen, mem_ctx,
 249                                                  &mdata->flag_change, &np);
 250                 break;
 251
 252         case CTDB_SRVID_RECD_UPDATE_IP:
 253                 ret = ctdb_public_ip_pull(buf, buflen, mem_ctx,
 254                                           &mdata->pubip, &np);
 255                 break;
 256
 257         case CTDB_SRVID_VACUUM_FETCH:
 258                 ret = ctdb_rec_buffer_pull(buf, buflen, mem_ctx,
 259                                            &mdata->recbuf, &np);
 260                 break;
 261
 262         case CTDB_SRVID_DETACH_DATABASE:
 263                 ret = ctdb_uint32_pull(buf, buflen, &mdata->db_id, &np);
 264                 break;
 265
 266         case CTDB_SRVID_MEM_DUMP:
 267                 ret = ctdb_srvid_message_pull(buf, buflen, mem_ctx,
 268                                               &mdata->msg, &np);
 269                 break;
 270
 271         case CTDB_SRVID_GETLOG:
 272                 break;
 273
 274         case CTDB_SRVID_CLEARLOG:
 275                 break;
 276
 277         case CTDB_SRVID_PUSH_NODE_FLAGS:
 278                 ret = ctdb_node_flag_change_pull(buf, buflen, mem_ctx,
 279                                                  &mdata->flag_change, &np);
 280                 break;
 281
 282         case CTDB_SRVID_RELOAD_NODES:
 283                 break;
 284
 285         case CTDB_SRVID_TAKEOVER_RUN:
 286                 ret = ctdb_srvid_message_pull(buf, buflen, mem_ctx,
 287                                               &mdata->msg, &np);
 288                 break;
 289
 290         case CTDB_SRVID_REBALANCE_NODE:
 291                 ret = ctdb_uint32_pull(buf, buflen, &mdata->pnn, &np);
 292                 break;
 293
 294         case CTDB_SRVID_DISABLE_TAKEOVER_RUNS:
 295                 ret = ctdb_disable_message_pull(buf, buflen, mem_ctx,
 296                                                 &mdata->disable, &np);
 297                 break;
 298
 299         case CTDB_SRVID_DISABLE_RECOVERIES:
 300                 ret = ctdb_disable_message_pull(buf, buflen, mem_ctx,
 301                                                 &mdata->disable, &np);
 302                 break;
 303
 304         case CTDB_SRVID_DISABLE_IP_CHECK:
 305                 ret = ctdb_uint32_pull(buf, buflen, &mdata->timeout, &np);
 306                 break;
 307
 308         default:
 309                 ret = ctdb_tdb_data_pull(buf, buflen, mem_ctx, &mdata->data,
 310                                          &np);
 311                 break;
 312         }
 313
 314         if (ret != 0) {
 315                 return ret;
 316         }
 317
 318         *npull = np;
 319         return 0;
 320 }
 321
 322 size_t ctdb_req_message_len(struct ctdb_req_header *h,
 323                             struct ctdb_req_message *c)
 324 {
 325         uint32_t u32 = ctdb_message_data_len(&c->data, c->srvid);
 326
 327         return ctdb_req_header_len(h) +
 328                 ctdb_uint64_len(&c->srvid) +
 329                 ctdb_uint32_len(&u32) + u32;
 330 }
 331
 332 int ctdb_req_message_push(struct ctdb_req_header *h,
 333                           struct ctdb_req_message *c,
 334                           uint8_t *buf, size_t *buflen)
 335 {
 336         size_t offset = 0, np;
 337         size_t length;
 338         uint32_t u32;
 339
 340         length = ctdb_req_message_len(h, c);
 341         if (*buflen < length) {
 342                 *buflen = length;
 343                 return EMSGSIZE;
 344         }
 345
 346         h->length = *buflen;
 347         ctdb_req_header_push(h, buf+offset, &np);
 348         offset += np;
 349
 350         ctdb_uint64_push(&c->srvid, buf+offset, &np);
 351         offset += np;
 352
 353         u32 = ctdb_message_data_len(&c->data, c->srvid);
 354         ctdb_uint32_push(&u32, buf+offset, &np);
 355         offset += np;
 356
 357         ctdb_message_data_push(&c->data, c->srvid, buf+offset, &np);
 358         offset += np;
 359
 360         return 0;
 361 }
 362
 363 int ctdb_req_message_pull(uint8_t *buf, size_t buflen,
 364                           struct ctdb_req_header *h,
 365                           TALLOC_CTX *mem_ctx,
 366                           struct ctdb_req_message *c)
 367 {
 368         struct ctdb_req_header header;
 369         size_t offset = 0, np;
 370         uint32_t u32;
 371         int ret;
 372
 373         ret = ctdb_req_header_pull(buf+offset, buflen-offset, &header, &np);
 374         if (ret != 0) {
 375                 return ret;
 376         }
 377         offset += np;
 378
 379         if (h != NULL) {
 380                 *h = header;
 381         }
 382
 383         ret = ctdb_uint64_pull(buf+offset, buflen-offset, &c->srvid, &np);
 384         if (ret != 0) {
 385                 return ret;
 386         }
 387         offset += np;
 388
 389         ret = ctdb_uint32_pull(buf+offset, buflen-offset, &u32, &np);
 390         if (ret != 0) {
 391                 return ret;
 392         }
 393         offset += np;
 394
 395         if (buflen-offset < u32) {
 396                 return EMSGSIZE;
 397         }
 398
 399         ret = ctdb_message_data_pull(buf+offset, u32, c->srvid,
 400                                      mem_ctx, &c->data, &np);
 401         if (ret != 0) {
 402                 return ret;
 403         }
 404         offset += np;
 405
 406         return ret;
 407 }
 408
 409 size_t ctdb_req_message_data_len(struct ctdb_req_header *h,
 410                                  struct ctdb_req_message_data *c)
 411 {
 412         return ctdb_req_header_len(h) +
 413                 ctdb_uint64_len(&c->srvid) +
 414                 ctdb_tdb_datan_len(&c->data);
 415 }
 416
 417 int ctdb_req_message_data_push(struct ctdb_req_header *h,
 418                                struct ctdb_req_message_data *c,
 419                                uint8_t *buf, size_t *buflen)
 420 {
 421         size_t offset = 0, np;
 422         size_t length;
 423
 424         length = ctdb_req_message_data_len(h, c);
 425         if (*buflen < length) {
 426                 *buflen = length;
 427                 return EMSGSIZE;
 428         }
 429
 430         h->length = *buflen;
 431         ctdb_req_header_push(h, buf+offset, &np);
 432         offset += np;
 433
 434         ctdb_uint64_push(&c->srvid, buf+offset, &np);
 435         offset += np;
 436
 437         ctdb_tdb_datan_push(&c->data, buf+offset, &np);
 438         offset += np;
 439
 440         return 0;
 441 }
 442
 443 int ctdb_req_message_data_pull(uint8_t *buf, size_t buflen,
 444                                struct ctdb_req_header *h,
 445                                TALLOC_CTX *mem_ctx,
 446                                struct ctdb_req_message_data *c)
 447 {
 448         struct ctdb_req_header header;
 449         size_t offset = 0, np;
 450         int ret;
 451
 452         ret = ctdb_req_header_pull(buf+offset, buflen-offset, &header, &np);
 453         if (ret != 0) {
 454                 return ret;
 455         }
 456         offset += np;
 457
 458         if (h != NULL) {
 459                 *h = header;
 460         }
 461
 462         ret = ctdb_uint64_pull(buf+offset, buflen-offset, &c->srvid, &np);
 463         if (ret != 0) {
 464                 return ret;
 465         }
 466         offset += np;
 467
 468         ret = ctdb_tdb_datan_pull(buf+offset, buflen-offset,
 469                                   mem_ctx, &c->data, &np);
 470         if (ret != 0) {
 471                 return ret;
 472         }
 473         offset += np;
 474
 475         return 0;
 476 }