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_RECONFIGURE:
  46                 break;
  47
  48         case CTDB_SRVID_RELEASE_IP:
  49                 len = ctdb_string_len(&mdata->ipaddr);
  50                 break;
  51
  52         case CTDB_SRVID_TAKE_IP:
  53                 len = ctdb_string_len(&mdata->ipaddr);
  54                 break;
  55
  56         case CTDB_SRVID_SET_NODE_FLAGS:
  57                 len = ctdb_node_flag_change_len(mdata->flag_change);
  58                 break;
  59
  60         case CTDB_SRVID_RECD_UPDATE_IP:
  61                 len = ctdb_public_ip_len(mdata->pubip);
  62                 break;
  63
  64         case CTDB_SRVID_VACUUM_FETCH:
  65                 len = ctdb_rec_buffer_len(mdata->recbuf);
  66                 break;
  67
  68         case CTDB_SRVID_DETACH_DATABASE:
  69                 len = ctdb_uint32_len(&mdata->db_id);
  70                 break;
  71
  72         case CTDB_SRVID_MEM_DUMP:
  73                 len = ctdb_srvid_message_len(mdata->msg);
  74                 break;
  75
  76         case CTDB_SRVID_GETLOG:
  77                 break;
  78
  79         case CTDB_SRVID_CLEARLOG:
  80                 break;
  81
  82         case CTDB_SRVID_PUSH_NODE_FLAGS:
  83                 len = ctdb_node_flag_change_len(mdata->flag_change);
  84                 break;
  85
  86         case CTDB_SRVID_RELOAD_NODES:
  87                 break;
  88
  89         case CTDB_SRVID_TAKEOVER_RUN:
  90                 len = ctdb_srvid_message_len(mdata->msg);
  91                 break;
  92
  93         case CTDB_SRVID_REBALANCE_NODE:
  94                 len = ctdb_uint32_len(&mdata->pnn);
  95                 break;
  96
  97         case CTDB_SRVID_DISABLE_TAKEOVER_RUNS:
  98                 len = ctdb_disable_message_len(mdata->disable);
  99                 break;
 100
 101         case CTDB_SRVID_DISABLE_RECOVERIES:
 102                 len = ctdb_disable_message_len(mdata->disable);
 103                 break;
 104
 105         case CTDB_SRVID_DISABLE_IP_CHECK:
 106                 len = ctdb_uint32_len(&mdata->timeout);
 107                 break;
 108
 109         default:
 110                 len = ctdb_tdb_data_len(&mdata->data);
 111                 break;
 112         }
 113
 114         return len;
 115 }
 116
 117 static void ctdb_message_data_push(union ctdb_message_data *mdata,
 118                                    uint64_t srvid, uint8_t *buf,
 119                                    size_t *npush)
 120 {
 121         size_t np = 0;
 122
 123         switch (srvid) {
 124         case CTDB_SRVID_BANNING:
 125                 ctdb_uint32_push(&mdata->pnn, buf, &np);
 126                 break;
 127
 128         case CTDB_SRVID_ELECTION:
 129                 ctdb_election_message_push(mdata->election, buf, &np);
 130                 break;
 131
 132         case CTDB_SRVID_RECONFIGURE:
 133                 break;
 134
 135         case CTDB_SRVID_RELEASE_IP:
 136                 ctdb_string_push(&mdata->ipaddr, buf, &np);
 137                 break;
 138
 139         case CTDB_SRVID_TAKE_IP:
 140                 ctdb_string_push(&mdata->ipaddr, buf, &np);
 141                 break;
 142
 143         case CTDB_SRVID_SET_NODE_FLAGS:
 144                 ctdb_node_flag_change_push(mdata->flag_change, buf, &np);
 145                 break;
 146
 147         case CTDB_SRVID_RECD_UPDATE_IP:
 148                 ctdb_public_ip_push(mdata->pubip, buf, &np);
 149                 break;
 150
 151         case CTDB_SRVID_VACUUM_FETCH:
 152                 ctdb_rec_buffer_push(mdata->recbuf, buf, &np);
 153                 break;
 154
 155         case CTDB_SRVID_DETACH_DATABASE:
 156                 ctdb_uint32_push(&mdata->db_id, buf, &np);
 157                 break;
 158
 159         case CTDB_SRVID_MEM_DUMP:
 160                 ctdb_srvid_message_push(mdata->msg, buf, &np);
 161                 break;
 162
 163         case CTDB_SRVID_GETLOG:
 164                 break;
 165
 166         case CTDB_SRVID_CLEARLOG:
 167                 break;
 168
 169         case CTDB_SRVID_PUSH_NODE_FLAGS:
 170                 ctdb_node_flag_change_push(mdata->flag_change, buf, &np);
 171                 break;
 172
 173         case CTDB_SRVID_RELOAD_NODES:
 174                 break;
 175
 176         case CTDB_SRVID_TAKEOVER_RUN:
 177                 ctdb_srvid_message_push(mdata->msg, buf, &np);
 178                 break;
 179
 180         case CTDB_SRVID_REBALANCE_NODE:
 181                 ctdb_uint32_push(&mdata->pnn, buf, &np);
 182                 break;
 183
 184         case CTDB_SRVID_DISABLE_TAKEOVER_RUNS:
 185                 ctdb_disable_message_push(mdata->disable, buf, &np);
 186                 break;
 187
 188         case CTDB_SRVID_DISABLE_RECOVERIES:
 189                 ctdb_disable_message_push(mdata->disable, buf, &np);
 190                 break;
 191
 192         case CTDB_SRVID_DISABLE_IP_CHECK:
 193                 ctdb_uint32_push(&mdata->timeout, buf, &np);
 194                 break;
 195
 196         default:
 197                 ctdb_tdb_data_push(&mdata->data, buf, &np);
 198                 break;
 199         }
 200
 201         *npush = np;
 202 }
 203
 204 static int ctdb_message_data_pull(uint8_t *buf, size_t buflen,
 205                                   uint64_t srvid, TALLOC_CTX *mem_ctx,
 206                                   union ctdb_message_data *mdata,
 207                                   size_t *npull)
 208 {
 209         int ret = 0;
 210         size_t np = 0;
 211
 212         switch (srvid) {
 213         case CTDB_SRVID_BANNING:
 214                 ret = ctdb_uint32_pull(buf, buflen, &mdata->pnn, &np);
 215                 break;
 216
 217         case CTDB_SRVID_ELECTION:
 218                 ret = ctdb_election_message_pull(buf, buflen, mem_ctx,
 219                                                  &mdata->election, &np);
 220                 break;
 221
 222         case CTDB_SRVID_RECONFIGURE:
 223                 break;
 224
 225         case CTDB_SRVID_RELEASE_IP:
 226                 ret = ctdb_string_pull(buf, buflen, mem_ctx, &mdata->ipaddr,
 227                                        &np);
 228                 break;
 229
 230         case CTDB_SRVID_TAKE_IP:
 231                 ret = ctdb_string_pull(buf, buflen, mem_ctx, &mdata->ipaddr,
 232                                        &np);
 233                 break;
 234
 235         case CTDB_SRVID_SET_NODE_FLAGS:
 236                 ret = ctdb_node_flag_change_pull(buf, buflen, mem_ctx,
 237                                                  &mdata->flag_change, &np);
 238                 break;
 239
 240         case CTDB_SRVID_RECD_UPDATE_IP:
 241                 ret = ctdb_public_ip_pull(buf, buflen, mem_ctx,
 242                                           &mdata->pubip, &np);
 243                 break;
 244
 245         case CTDB_SRVID_VACUUM_FETCH:
 246                 ret = ctdb_rec_buffer_pull(buf, buflen, mem_ctx,
 247                                            &mdata->recbuf, &np);
 248                 break;
 249
 250         case CTDB_SRVID_DETACH_DATABASE:
 251                 ret = ctdb_uint32_pull(buf, buflen, &mdata->db_id, &np);
 252                 break;
 253
 254         case CTDB_SRVID_MEM_DUMP:
 255                 ret = ctdb_srvid_message_pull(buf, buflen, mem_ctx,
 256                                               &mdata->msg, &np);
 257                 break;
 258
 259         case CTDB_SRVID_GETLOG:
 260                 break;
 261
 262         case CTDB_SRVID_CLEARLOG:
 263                 break;
 264
 265         case CTDB_SRVID_PUSH_NODE_FLAGS:
 266                 ret = ctdb_node_flag_change_pull(buf, buflen, mem_ctx,
 267                                                  &mdata->flag_change, &np);
 268                 break;
 269
 270         case CTDB_SRVID_RELOAD_NODES:
 271                 break;
 272
 273         case CTDB_SRVID_TAKEOVER_RUN:
 274                 ret = ctdb_srvid_message_pull(buf, buflen, mem_ctx,
 275                                               &mdata->msg, &np);
 276                 break;
 277
 278         case CTDB_SRVID_REBALANCE_NODE:
 279                 ret = ctdb_uint32_pull(buf, buflen, &mdata->pnn, &np);
 280                 break;
 281
 282         case CTDB_SRVID_DISABLE_TAKEOVER_RUNS:
 283                 ret = ctdb_disable_message_pull(buf, buflen, mem_ctx,
 284                                                 &mdata->disable, &np);
 285                 break;
 286
 287         case CTDB_SRVID_DISABLE_RECOVERIES:
 288                 ret = ctdb_disable_message_pull(buf, buflen, mem_ctx,
 289                                                 &mdata->disable, &np);
 290                 break;
 291
 292         case CTDB_SRVID_DISABLE_IP_CHECK:
 293                 ret = ctdb_uint32_pull(buf, buflen, &mdata->timeout, &np);
 294                 break;
 295
 296         default:
 297                 ret = ctdb_tdb_data_pull(buf, buflen, mem_ctx, &mdata->data,
 298                                          &np);
 299                 break;
 300         }
 301
 302         if (ret != 0) {
 303                 return ret;
 304         }
 305
 306         *npull = np;
 307         return 0;
 308 }
 309
 310 size_t ctdb_req_message_len(struct ctdb_req_header *h,
 311                             struct ctdb_req_message *c)
 312 {
 313         uint32_t u32 = ctdb_message_data_len(&c->data, c->srvid);
 314
 315         return ctdb_req_header_len(h) +
 316                 ctdb_uint64_len(&c->srvid) +
 317                 ctdb_uint32_len(&u32) + u32;
 318 }
 319
 320 int ctdb_req_message_push(struct ctdb_req_header *h,
 321                           struct ctdb_req_message *c,
 322                           uint8_t *buf, size_t *buflen)
 323 {
 324         size_t offset = 0, np;
 325         size_t length;
 326         uint32_t u32;
 327
 328         length = ctdb_req_message_len(h, c);
 329         if (*buflen < length) {
 330                 *buflen = length;
 331                 return EMSGSIZE;
 332         }
 333
 334         h->length = *buflen;
 335         ctdb_req_header_push(h, buf+offset, &np);
 336         offset += np;
 337
 338         ctdb_uint64_push(&c->srvid, buf+offset, &np);
 339         offset += np;
 340
 341         u32 = ctdb_message_data_len(&c->data, c->srvid);
 342         ctdb_uint32_push(&u32, buf+offset, &np);
 343         offset += np;
 344
 345         ctdb_message_data_push(&c->data, c->srvid, buf+offset, &np);
 346         offset += np;
 347
 348         return 0;
 349 }
 350
 351 int ctdb_req_message_pull(uint8_t *buf, size_t buflen,
 352                           struct ctdb_req_header *h,
 353                           TALLOC_CTX *mem_ctx,
 354                           struct ctdb_req_message *c)
 355 {
 356         struct ctdb_req_header header;
 357         size_t offset = 0, np;
 358         uint32_t u32;
 359         int ret;
 360
 361         ret = ctdb_req_header_pull(buf+offset, buflen-offset, &header, &np);
 362         if (ret != 0) {
 363                 return ret;
 364         }
 365         offset += np;
 366
 367         if (h != NULL) {
 368                 *h = header;
 369         }
 370
 371         ret = ctdb_uint64_pull(buf+offset, buflen-offset, &c->srvid, &np);
 372         if (ret != 0) {
 373                 return ret;
 374         }
 375         offset += np;
 376
 377         ret = ctdb_uint32_pull(buf+offset, buflen-offset, &u32, &np);
 378         if (ret != 0) {
 379                 return ret;
 380         }
 381         offset += np;
 382
 383         if (buflen-offset < u32) {
 384                 return EMSGSIZE;
 385         }
 386
 387         ret = ctdb_message_data_pull(buf+offset, u32, c->srvid,
 388                                      mem_ctx, &c->data, &np);
 389         if (ret != 0) {
 390                 return ret;
 391         }
 392         offset += np;
 393
 394         return ret;
 395 }
 396
 397 size_t ctdb_req_message_data_len(struct ctdb_req_header *h,
 398                                  struct ctdb_req_message_data *c)
 399 {
 400         return ctdb_req_header_len(h) +
 401                 ctdb_uint64_len(&c->srvid) +
 402                 ctdb_tdb_datan_len(&c->data);
 403 }
 404
 405 int ctdb_req_message_data_push(struct ctdb_req_header *h,
 406                                struct ctdb_req_message_data *c,
 407                                uint8_t *buf, size_t *buflen)
 408 {
 409         size_t offset = 0, np;
 410         size_t length;
 411
 412         length = ctdb_req_message_data_len(h, c);
 413         if (*buflen < length) {
 414                 *buflen = length;
 415                 return EMSGSIZE;
 416         }
 417
 418         h->length = *buflen;
 419         ctdb_req_header_push(h, buf+offset, &np);
 420         offset += np;
 421
 422         ctdb_uint64_push(&c->srvid, buf+offset, &np);
 423         offset += np;
 424
 425         ctdb_tdb_datan_push(&c->data, buf+offset, &np);
 426         offset += np;
 427
 428         return 0;
 429 }
 430
 431 int ctdb_req_message_data_pull(uint8_t *buf, size_t buflen,
 432                                struct ctdb_req_header *h,
 433                                TALLOC_CTX *mem_ctx,
 434                                struct ctdb_req_message_data *c)
 435 {
 436         struct ctdb_req_header header;
 437         size_t offset = 0, np;
 438         int ret;
 439
 440         ret = ctdb_req_header_pull(buf+offset, buflen-offset, &header, &np);
 441         if (ret != 0) {
 442                 return ret;
 443         }
 444         offset += np;
 445
 446         if (h != NULL) {
 447                 *h = header;
 448         }
 449
 450         ret = ctdb_uint64_pull(buf+offset, buflen-offset, &c->srvid, &np);
 451         if (ret != 0) {
 452                 return ret;
 453         }
 454         offset += np;
 455
 456         ret = ctdb_tdb_datan_pull(buf+offset, buflen-offset,
 457                                   mem_ctx, &c->data, &np);
 458         if (ret != 0) {
 459                 return ret;
 460         }
 461         offset += np;
 462
 463         return 0;
 464 }