source4/wrepl_server/wrepl_out_helpers.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    WINS Replication server
   5
   6    Copyright (C) Stefan Metzmacher      2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "lib/events/events.h"
  24 #include "lib/socket/socket.h"
  25 #include "smbd/service_task.h"
  26 #include "smbd/service_stream.h"
  27 #include "librpc/gen_ndr/winsrepl.h"
  28 #include "wrepl_server/wrepl_server.h"
  29 #include "nbt_server/wins/winsdb.h"
  30 #include "libcli/composite/composite.h"
  31 #include "libcli/wrepl/winsrepl.h"
  32 #include "libcli/resolve/resolve.h"
  33 #include "param/param.h"
  34
  35 enum wreplsrv_out_connect_stage {
  36         WREPLSRV_OUT_CONNECT_STAGE_WAIT_SOCKET,
  37         WREPLSRV_OUT_CONNECT_STAGE_WAIT_ASSOC_CTX,
  38         WREPLSRV_OUT_CONNECT_STAGE_DONE
  39 };
  40
  41 struct wreplsrv_out_connect_state {
  42         enum wreplsrv_out_connect_stage stage;
  43         struct composite_context *c;
  44         struct wrepl_associate assoc_io;
  45         enum winsrepl_partner_type type;
  46         struct wreplsrv_out_connection *wreplconn;
  47         struct tevent_req *subreq;
  48 };
  49
  50 static void wreplsrv_out_connect_handler_treq(struct tevent_req *subreq);
  51
  52 static NTSTATUS wreplsrv_out_connect_wait_socket(struct wreplsrv_out_connect_state *state)
  53 {
  54         NTSTATUS status;
  55
  56         status = wrepl_connect_recv(state->subreq);
  57         TALLOC_FREE(state->subreq);
  58         NT_STATUS_NOT_OK_RETURN(status);
  59
  60         state->subreq = wrepl_associate_send(state,
  61                                              state->wreplconn->service->task->event_ctx,
  62                                              state->wreplconn->sock, &state->assoc_io);
  63         NT_STATUS_HAVE_NO_MEMORY(state->subreq);
  64
  65         tevent_req_set_callback(state->subreq,
  66                                 wreplsrv_out_connect_handler_treq,
  67                                 state);
  68
  69         state->stage = WREPLSRV_OUT_CONNECT_STAGE_WAIT_ASSOC_CTX;
  70
  71         return NT_STATUS_OK;
  72 }
  73
  74 static NTSTATUS wreplsrv_out_connect_wait_assoc_ctx(struct wreplsrv_out_connect_state *state)
  75 {
  76         NTSTATUS status;
  77
  78         status = wrepl_associate_recv(state->subreq, &state->assoc_io);
  79         TALLOC_FREE(state->subreq);
  80         NT_STATUS_NOT_OK_RETURN(status);
  81
  82         state->wreplconn->assoc_ctx.peer_ctx = state->assoc_io.out.assoc_ctx;
  83         state->wreplconn->assoc_ctx.peer_major = state->assoc_io.out.major_version;
  84
  85         if (state->type == WINSREPL_PARTNER_PUSH) {
  86                 if (state->wreplconn->assoc_ctx.peer_major >= 5) {
  87                         state->wreplconn->partner->push.wreplconn = state->wreplconn;
  88                         talloc_steal(state->wreplconn->partner, state->wreplconn);
  89                 } else {
  90                         state->type = WINSREPL_PARTNER_NONE;
  91                 }
  92         } else if (state->type == WINSREPL_PARTNER_PULL) {
  93                 state->wreplconn->partner->pull.wreplconn = state->wreplconn;
  94                 talloc_steal(state->wreplconn->partner, state->wreplconn);
  95         }
  96
  97         state->stage = WREPLSRV_OUT_CONNECT_STAGE_DONE;
  98
  99         return NT_STATUS_OK;
 100 }
 101
 102 static void wreplsrv_out_connect_handler(struct wreplsrv_out_connect_state *state)
 103 {
 104         struct composite_context *c = state->c;
 105
 106         switch (state->stage) {
 107         case WREPLSRV_OUT_CONNECT_STAGE_WAIT_SOCKET:
 108                 c->status = wreplsrv_out_connect_wait_socket(state);
 109                 break;
 110         case WREPLSRV_OUT_CONNECT_STAGE_WAIT_ASSOC_CTX:
 111                 c->status = wreplsrv_out_connect_wait_assoc_ctx(state);
 112                 c->state  = COMPOSITE_STATE_DONE;
 113                 break;
 114         case WREPLSRV_OUT_CONNECT_STAGE_DONE:
 115                 c->status = NT_STATUS_INTERNAL_ERROR;
 116         }
 117
 118         if (!NT_STATUS_IS_OK(c->status)) {
 119                 c->state = COMPOSITE_STATE_ERROR;
 120         }
 121
 122         if (c->state >= COMPOSITE_STATE_DONE && c->async.fn) {
 123                 c->async.fn(c);
 124         }
 125 }
 126
 127 static void wreplsrv_out_connect_handler_treq(struct tevent_req *subreq)
 128 {
 129         struct wreplsrv_out_connect_state *state = tevent_req_callback_data(subreq,
 130                                                    struct wreplsrv_out_connect_state);
 131         wreplsrv_out_connect_handler(state);
 132         return;
 133 }
 134
 135 static struct composite_context *wreplsrv_out_connect_send(struct wreplsrv_partner *partner,
 136                                                            enum winsrepl_partner_type type,
 137                                                            struct wreplsrv_out_connection *wreplconn)
 138 {
 139         struct composite_context *c = NULL;
 140         struct wreplsrv_service *service = partner->service;
 141         struct wreplsrv_out_connect_state *state = NULL;
 142         struct wreplsrv_out_connection **wreplconnp = &wreplconn;
 143         bool cached_connection = false;
 144
 145         c = talloc_zero(partner, struct composite_context);
 146         if (!c) goto failed;
 147
 148         state = talloc_zero(c, struct wreplsrv_out_connect_state);
 149         if (!state) goto failed;
 150         state->c        = c;
 151         state->type     = type;
 152
 153         c->state        = COMPOSITE_STATE_IN_PROGRESS;
 154         c->event_ctx    = service->task->event_ctx;
 155         c->private_data = state;
 156
 157         if (type == WINSREPL_PARTNER_PUSH) {
 158                 cached_connection       = true;
 159                 wreplconn               = partner->push.wreplconn;
 160                 wreplconnp              = &partner->push.wreplconn;
 161         } else if (type == WINSREPL_PARTNER_PULL) {
 162                 cached_connection       = true;
 163                 wreplconn               = partner->pull.wreplconn;
 164                 wreplconnp              = &partner->pull.wreplconn;
 165         }
 166
 167         /* we have a connection already, so use it */
 168         if (wreplconn) {
 169                 if (wrepl_socket_is_connected(wreplconn->sock)) {
 170                         state->stage    = WREPLSRV_OUT_CONNECT_STAGE_DONE;
 171                         state->wreplconn= wreplconn;
 172                         composite_done(c);
 173                         return c;
 174                 } else if (!cached_connection) {
 175                         state->stage    = WREPLSRV_OUT_CONNECT_STAGE_DONE;
 176                         state->wreplconn= NULL;
 177                         composite_done(c);
 178                         return c;
 179                 } else {
 180                         talloc_free(wreplconn);
 181                         *wreplconnp = NULL;
 182                 }
 183         }
 184
 185         wreplconn = talloc_zero(state, struct wreplsrv_out_connection);
 186         if (!wreplconn) goto failed;
 187
 188         wreplconn->service      = service;
 189         wreplconn->partner      = partner;
 190         wreplconn->sock         = wrepl_socket_init(wreplconn, service->task->event_ctx, lp_iconv_convenience(service->task->lp_ctx));
 191         if (!wreplconn->sock) goto failed;
 192
 193         state->stage    = WREPLSRV_OUT_CONNECT_STAGE_WAIT_SOCKET;
 194         state->wreplconn= wreplconn;
 195         state->subreq   = wrepl_connect_send(state,
 196                                              service->task->event_ctx,
 197                                              wreplconn->sock,
 198                                              partner->our_address?partner->our_address:wrepl_best_ip(service->task->lp_ctx, partner->address),
 199                                              partner->address);
 200         if (!state->subreq) goto failed;
 201
 202         tevent_req_set_callback(state->subreq,
 203                                 wreplsrv_out_connect_handler_treq,
 204                                 state);
 205
 206         return c;
 207 failed:
 208         talloc_free(c);
 209         return NULL;
 210 }
 211
 212 static NTSTATUS wreplsrv_out_connect_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 213                                           struct wreplsrv_out_connection **wreplconn)
 214 {
 215         NTSTATUS status;
 216
 217         status = composite_wait(c);
 218
 219         if (NT_STATUS_IS_OK(status)) {
 220                 struct wreplsrv_out_connect_state *state = talloc_get_type(c->private_data,
 221                                                            struct wreplsrv_out_connect_state);
 222                 if (state->wreplconn) {
 223                         *wreplconn = talloc_reference(mem_ctx, state->wreplconn);
 224                         if (!*wreplconn) status = NT_STATUS_NO_MEMORY;
 225                 } else {
 226                         status = NT_STATUS_INVALID_CONNECTION;
 227                 }
 228         }
 229
 230         talloc_free(c);
 231         return status;
 232
 233 }
 234
 235 struct wreplsrv_pull_table_io {
 236         struct {
 237                 struct wreplsrv_partner *partner;
 238                 uint32_t num_owners;
 239                 struct wrepl_wins_owner *owners;
 240         } in;
 241         struct {
 242                 uint32_t num_owners;
 243                 struct wrepl_wins_owner *owners;
 244         } out;
 245 };
 246
 247 enum wreplsrv_pull_table_stage {
 248         WREPLSRV_PULL_TABLE_STAGE_WAIT_CONNECTION,
 249         WREPLSRV_PULL_TABLE_STAGE_WAIT_TABLE_REPLY,
 250         WREPLSRV_PULL_TABLE_STAGE_DONE
 251 };
 252
 253 struct wreplsrv_pull_table_state {
 254         enum wreplsrv_pull_table_stage stage;
 255         struct composite_context *c;
 256         struct wrepl_pull_table table_io;
 257         struct wreplsrv_pull_table_io *io;
 258         struct composite_context *creq;
 259         struct wreplsrv_out_connection *wreplconn;
 260         struct tevent_req *subreq;
 261 };
 262
 263 static void wreplsrv_pull_table_handler_treq(struct tevent_req *subreq);
 264
 265 static NTSTATUS wreplsrv_pull_table_wait_connection(struct wreplsrv_pull_table_state *state)
 266 {
 267         NTSTATUS status;
 268
 269         status = wreplsrv_out_connect_recv(state->creq, state, &state->wreplconn);
 270         NT_STATUS_NOT_OK_RETURN(status);
 271
 272         state->table_io.in.assoc_ctx = state->wreplconn->assoc_ctx.peer_ctx;
 273         state->subreq = wrepl_pull_table_send(state,
 274                                               state->wreplconn->service->task->event_ctx,
 275                                               state->wreplconn->sock, &state->table_io);
 276         NT_STATUS_HAVE_NO_MEMORY(state->subreq);
 277
 278         tevent_req_set_callback(state->subreq,
 279                                 wreplsrv_pull_table_handler_treq,
 280                                 state);
 281
 282         state->stage = WREPLSRV_PULL_TABLE_STAGE_WAIT_TABLE_REPLY;
 283
 284         return NT_STATUS_OK;
 285 }
 286
 287 static NTSTATUS wreplsrv_pull_table_wait_table_reply(struct wreplsrv_pull_table_state *state)
 288 {
 289         NTSTATUS status;
 290
 291         status = wrepl_pull_table_recv(state->subreq, state, &state->table_io);
 292         TALLOC_FREE(state->subreq);
 293         NT_STATUS_NOT_OK_RETURN(status);
 294
 295         state->stage = WREPLSRV_PULL_TABLE_STAGE_DONE;
 296
 297         return NT_STATUS_OK;
 298 }
 299
 300 static void wreplsrv_pull_table_handler(struct wreplsrv_pull_table_state *state)
 301 {
 302         struct composite_context *c = state->c;
 303
 304         switch (state->stage) {
 305         case WREPLSRV_PULL_TABLE_STAGE_WAIT_CONNECTION:
 306                 c->status = wreplsrv_pull_table_wait_connection(state);
 307                 break;
 308         case WREPLSRV_PULL_TABLE_STAGE_WAIT_TABLE_REPLY:
 309                 c->status = wreplsrv_pull_table_wait_table_reply(state);
 310                 c->state  = COMPOSITE_STATE_DONE;
 311                 break;
 312         case WREPLSRV_PULL_TABLE_STAGE_DONE:
 313                 c->status = NT_STATUS_INTERNAL_ERROR;
 314         }
 315
 316         if (!NT_STATUS_IS_OK(c->status)) {
 317                 c->state = COMPOSITE_STATE_ERROR;
 318         }
 319
 320         if (c->state >= COMPOSITE_STATE_DONE && c->async.fn) {
 321                 c->async.fn(c);
 322         }
 323 }
 324
 325 static void wreplsrv_pull_table_handler_creq(struct composite_context *creq)
 326 {
 327         struct wreplsrv_pull_table_state *state = talloc_get_type(creq->async.private_data,
 328                                                   struct wreplsrv_pull_table_state);
 329         wreplsrv_pull_table_handler(state);
 330         return;
 331 }
 332
 333 static void wreplsrv_pull_table_handler_treq(struct tevent_req *subreq)
 334 {
 335         struct wreplsrv_pull_table_state *state = tevent_req_callback_data(subreq,
 336                                                   struct wreplsrv_pull_table_state);
 337         wreplsrv_pull_table_handler(state);
 338         return;
 339 }
 340
 341 static struct composite_context *wreplsrv_pull_table_send(TALLOC_CTX *mem_ctx, struct wreplsrv_pull_table_io *io)
 342 {
 343         struct composite_context *c = NULL;
 344         struct wreplsrv_service *service = io->in.partner->service;
 345         struct wreplsrv_pull_table_state *state = NULL;
 346
 347         c = talloc_zero(mem_ctx, struct composite_context);
 348         if (!c) goto failed;
 349
 350         state = talloc_zero(c, struct wreplsrv_pull_table_state);
 351         if (!state) goto failed;
 352         state->c        = c;
 353         state->io       = io;
 354
 355         c->state        = COMPOSITE_STATE_IN_PROGRESS;
 356         c->event_ctx    = service->task->event_ctx;
 357         c->private_data = state;
 358
 359         if (io->in.num_owners) {
 360                 state->table_io.out.num_partners        = io->in.num_owners;
 361                 state->table_io.out.partners            = io->in.owners;
 362                 state->stage                            = WREPLSRV_PULL_TABLE_STAGE_DONE;
 363                 composite_done(c);
 364                 return c;
 365         }
 366
 367         state->stage    = WREPLSRV_PULL_TABLE_STAGE_WAIT_CONNECTION;
 368         state->creq     = wreplsrv_out_connect_send(io->in.partner, WINSREPL_PARTNER_PULL, NULL);
 369         if (!state->creq) goto failed;
 370
 371         state->creq->async.fn           = wreplsrv_pull_table_handler_creq;
 372         state->creq->async.private_data = state;
 373
 374         return c;
 375 failed:
 376         talloc_free(c);
 377         return NULL;
 378 }
 379
 380 static NTSTATUS wreplsrv_pull_table_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 381                                          struct wreplsrv_pull_table_io *io)
 382 {
 383         NTSTATUS status;
 384
 385         status = composite_wait(c);
 386
 387         if (NT_STATUS_IS_OK(status)) {
 388                 struct wreplsrv_pull_table_state *state = talloc_get_type(c->private_data,
 389                                                           struct wreplsrv_pull_table_state);
 390                 io->out.num_owners      = state->table_io.out.num_partners;
 391                 io->out.owners          = talloc_reference(mem_ctx, state->table_io.out.partners);
 392         }
 393
 394         talloc_free(c);
 395         return status;
 396 }
 397
 398 struct wreplsrv_pull_names_io {
 399         struct {
 400                 struct wreplsrv_partner *partner;
 401                 struct wreplsrv_out_connection *wreplconn;
 402                 struct wrepl_wins_owner owner;
 403         } in;
 404         struct {
 405                 uint32_t num_names;
 406                 struct wrepl_name *names;
 407         } out;
 408 };
 409
 410 enum wreplsrv_pull_names_stage {
 411         WREPLSRV_PULL_NAMES_STAGE_WAIT_CONNECTION,
 412         WREPLSRV_PULL_NAMES_STAGE_WAIT_SEND_REPLY,
 413         WREPLSRV_PULL_NAMES_STAGE_DONE
 414 };
 415
 416 struct wreplsrv_pull_names_state {
 417         enum wreplsrv_pull_names_stage stage;
 418         struct composite_context *c;
 419         struct wrepl_pull_names pull_io;
 420         struct wreplsrv_pull_names_io *io;
 421         struct composite_context *creq;
 422         struct wreplsrv_out_connection *wreplconn;
 423         struct tevent_req *subreq;
 424 };
 425
 426 static void wreplsrv_pull_names_handler_treq(struct tevent_req *subreq);
 427
 428 static NTSTATUS wreplsrv_pull_names_wait_connection(struct wreplsrv_pull_names_state *state)
 429 {
 430         NTSTATUS status;
 431
 432         status = wreplsrv_out_connect_recv(state->creq, state, &state->wreplconn);
 433         NT_STATUS_NOT_OK_RETURN(status);
 434
 435         state->pull_io.in.assoc_ctx     = state->wreplconn->assoc_ctx.peer_ctx;
 436         state->pull_io.in.partner       = state->io->in.owner;
 437         state->subreq = wrepl_pull_names_send(state,
 438                                               state->wreplconn->service->task->event_ctx,
 439                                               state->wreplconn->sock,
 440                                               &state->pull_io);
 441         NT_STATUS_HAVE_NO_MEMORY(state->subreq);
 442
 443         tevent_req_set_callback(state->subreq,
 444                                 wreplsrv_pull_names_handler_treq,
 445                                 state);
 446
 447         state->stage = WREPLSRV_PULL_NAMES_STAGE_WAIT_SEND_REPLY;
 448
 449         return NT_STATUS_OK;
 450 }
 451
 452 static NTSTATUS wreplsrv_pull_names_wait_send_reply(struct wreplsrv_pull_names_state *state)
 453 {
 454         NTSTATUS status;
 455
 456         status = wrepl_pull_names_recv(state->subreq, state, &state->pull_io);
 457         TALLOC_FREE(state->subreq);
 458         NT_STATUS_NOT_OK_RETURN(status);
 459
 460         state->stage = WREPLSRV_PULL_NAMES_STAGE_DONE;
 461
 462         return NT_STATUS_OK;
 463 }
 464
 465 static void wreplsrv_pull_names_handler(struct wreplsrv_pull_names_state *state)
 466 {
 467         struct composite_context *c = state->c;
 468
 469         switch (state->stage) {
 470         case WREPLSRV_PULL_NAMES_STAGE_WAIT_CONNECTION:
 471                 c->status = wreplsrv_pull_names_wait_connection(state);
 472                 break;
 473         case WREPLSRV_PULL_NAMES_STAGE_WAIT_SEND_REPLY:
 474                 c->status = wreplsrv_pull_names_wait_send_reply(state);
 475                 c->state  = COMPOSITE_STATE_DONE;
 476                 break;
 477         case WREPLSRV_PULL_NAMES_STAGE_DONE:
 478                 c->status = NT_STATUS_INTERNAL_ERROR;
 479         }
 480
 481         if (!NT_STATUS_IS_OK(c->status)) {
 482                 c->state = COMPOSITE_STATE_ERROR;
 483         }
 484
 485         if (c->state >= COMPOSITE_STATE_DONE && c->async.fn) {
 486                 c->async.fn(c);
 487         }
 488 }
 489
 490 static void wreplsrv_pull_names_handler_creq(struct composite_context *creq)
 491 {
 492         struct wreplsrv_pull_names_state *state = talloc_get_type(creq->async.private_data,
 493                                                   struct wreplsrv_pull_names_state);
 494         wreplsrv_pull_names_handler(state);
 495         return;
 496 }
 497
 498 static void wreplsrv_pull_names_handler_treq(struct tevent_req *subreq)
 499 {
 500         struct wreplsrv_pull_names_state *state = tevent_req_callback_data(subreq,
 501                                                   struct wreplsrv_pull_names_state);
 502         wreplsrv_pull_names_handler(state);
 503         return;
 504 }
 505
 506 static struct composite_context *wreplsrv_pull_names_send(TALLOC_CTX *mem_ctx, struct wreplsrv_pull_names_io *io)
 507 {
 508         struct composite_context *c = NULL;
 509         struct wreplsrv_service *service = io->in.partner->service;
 510         struct wreplsrv_pull_names_state *state = NULL;
 511         enum winsrepl_partner_type partner_type = WINSREPL_PARTNER_PULL;
 512
 513         if (io->in.wreplconn) partner_type = WINSREPL_PARTNER_NONE;
 514
 515         c = talloc_zero(mem_ctx, struct composite_context);
 516         if (!c) goto failed;
 517
 518         state = talloc_zero(c, struct wreplsrv_pull_names_state);
 519         if (!state) goto failed;
 520         state->c        = c;
 521         state->io       = io;
 522
 523         c->state        = COMPOSITE_STATE_IN_PROGRESS;
 524         c->event_ctx    = service->task->event_ctx;
 525         c->private_data = state;
 526
 527         state->stage    = WREPLSRV_PULL_NAMES_STAGE_WAIT_CONNECTION;
 528         state->creq     = wreplsrv_out_connect_send(io->in.partner, partner_type, io->in.wreplconn);
 529         if (!state->creq) goto failed;
 530
 531         state->creq->async.fn           = wreplsrv_pull_names_handler_creq;
 532         state->creq->async.private_data = state;
 533
 534         return c;
 535 failed:
 536         talloc_free(c);
 537         return NULL;
 538 }
 539
 540 static NTSTATUS wreplsrv_pull_names_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 541                                          struct wreplsrv_pull_names_io *io)
 542 {
 543         NTSTATUS status;
 544
 545         status = composite_wait(c);
 546
 547         if (NT_STATUS_IS_OK(status)) {
 548                 struct wreplsrv_pull_names_state *state = talloc_get_type(c->private_data,
 549                                                           struct wreplsrv_pull_names_state);
 550                 io->out.num_names       = state->pull_io.out.num_names;
 551                 io->out.names           = talloc_reference(mem_ctx, state->pull_io.out.names);
 552         }
 553
 554         talloc_free(c);
 555         return status;
 556
 557 }
 558
 559 enum wreplsrv_pull_cycle_stage {
 560         WREPLSRV_PULL_CYCLE_STAGE_WAIT_TABLE_REPLY,
 561         WREPLSRV_PULL_CYCLE_STAGE_WAIT_SEND_REPLIES,
 562         WREPLSRV_PULL_CYCLE_STAGE_WAIT_STOP_ASSOC,
 563         WREPLSRV_PULL_CYCLE_STAGE_DONE
 564 };
 565
 566 struct wreplsrv_pull_cycle_state {
 567         enum wreplsrv_pull_cycle_stage stage;
 568         struct composite_context *c;
 569         struct wreplsrv_pull_cycle_io *io;
 570         struct wreplsrv_pull_table_io table_io;
 571         uint32_t current;
 572         struct wreplsrv_pull_names_io names_io;
 573         struct composite_context *creq;
 574         struct wrepl_associate_stop assoc_stop_io;
 575         struct tevent_req *subreq;
 576 };
 577
 578 static void wreplsrv_pull_cycle_handler_creq(struct composite_context *creq);
 579 static void wreplsrv_pull_cycle_handler_treq(struct tevent_req *subreq);
 580
 581 static NTSTATUS wreplsrv_pull_cycle_next_owner_do_work(struct wreplsrv_pull_cycle_state *state)
 582 {
 583         struct wreplsrv_owner *current_owner=NULL;
 584         struct wreplsrv_owner *local_owner;
 585         uint32_t i;
 586         uint64_t old_max_version = 0;
 587         bool do_pull = false;
 588
 589         for (i=state->current; i < state->table_io.out.num_owners; i++) {
 590                 current_owner = wreplsrv_find_owner(state->io->in.partner->service,
 591                                                     state->io->in.partner->pull.table,
 592                                                     state->table_io.out.owners[i].address);
 593
 594                 local_owner = wreplsrv_find_owner(state->io->in.partner->service,
 595                                                   state->io->in.partner->service->table,
 596                                                   state->table_io.out.owners[i].address);
 597                 /*
 598                  * this means we are ourself the current owner,
 599                  * and we don't want replicate ourself
 600                  */
 601                 if (!current_owner) continue;
 602
 603                 /*
 604                  * this means we don't have any records of this owner
 605                  * so fetch them
 606                  */
 607                 if (!local_owner) {
 608                         do_pull         = true;
 609
 610                         break;
 611                 }
 612
 613                 /*
 614                  * this means the remote partner has some new records of this owner
 615                  * fetch them
 616                  */
 617                 if (current_owner->owner.max_version > local_owner->owner.max_version) {
 618                         do_pull         = true;
 619                         old_max_version = local_owner->owner.max_version;
 620                         break;
 621                 }
 622         }
 623         state->current = i;
 624
 625         if (do_pull) {
 626                 state->names_io.in.partner              = state->io->in.partner;
 627                 state->names_io.in.wreplconn            = state->io->in.wreplconn;
 628                 state->names_io.in.owner                = current_owner->owner;
 629                 state->names_io.in.owner.min_version    = old_max_version + 1;
 630                 state->creq = wreplsrv_pull_names_send(state, &state->names_io);
 631                 NT_STATUS_HAVE_NO_MEMORY(state->creq);
 632
 633                 state->creq->async.fn           = wreplsrv_pull_cycle_handler_creq;
 634                 state->creq->async.private_data = state;
 635
 636                 return STATUS_MORE_ENTRIES;
 637         }
 638
 639         return NT_STATUS_OK;
 640 }
 641
 642 static NTSTATUS wreplsrv_pull_cycle_next_owner_wrapper(struct wreplsrv_pull_cycle_state *state)
 643 {
 644         NTSTATUS status;
 645
 646         status = wreplsrv_pull_cycle_next_owner_do_work(state);
 647         if (NT_STATUS_IS_OK(status)) {
 648                 state->stage = WREPLSRV_PULL_CYCLE_STAGE_DONE;
 649         } else if (NT_STATUS_EQUAL(STATUS_MORE_ENTRIES, status)) {
 650                 state->stage = WREPLSRV_PULL_CYCLE_STAGE_WAIT_SEND_REPLIES;
 651                 status = NT_STATUS_OK;
 652         }
 653
 654         if (state->stage == WREPLSRV_PULL_CYCLE_STAGE_DONE && state->io->in.wreplconn) {
 655                 state->assoc_stop_io.in.assoc_ctx       = state->io->in.wreplconn->assoc_ctx.peer_ctx;
 656                 state->assoc_stop_io.in.reason          = 0;
 657                 state->subreq = wrepl_associate_stop_send(state,
 658                                                           state->io->in.wreplconn->service->task->event_ctx,
 659                                                           state->io->in.wreplconn->sock,
 660                                                           &state->assoc_stop_io);
 661                 NT_STATUS_HAVE_NO_MEMORY(state->subreq);
 662
 663                 tevent_req_set_callback(state->subreq,
 664                                         wreplsrv_pull_cycle_handler_treq,
 665                                         state);
 666
 667                 state->stage = WREPLSRV_PULL_CYCLE_STAGE_WAIT_STOP_ASSOC;
 668         }
 669
 670         return status;
 671 }
 672
 673 static NTSTATUS wreplsrv_pull_cycle_wait_table_reply(struct wreplsrv_pull_cycle_state *state)
 674 {
 675         NTSTATUS status;
 676         uint32_t i;
 677
 678         status = wreplsrv_pull_table_recv(state->creq, state, &state->table_io);
 679         NT_STATUS_NOT_OK_RETURN(status);
 680
 681         /* update partner table */
 682         for (i=0; i < state->table_io.out.num_owners; i++) {
 683                 status = wreplsrv_add_table(state->io->in.partner->service,
 684                                             state->io->in.partner,
 685                                             &state->io->in.partner->pull.table,
 686                                             state->table_io.out.owners[i].address,
 687                                             state->table_io.out.owners[i].max_version);
 688                 NT_STATUS_NOT_OK_RETURN(status);
 689         }
 690
 691         status = wreplsrv_pull_cycle_next_owner_wrapper(state);
 692         NT_STATUS_NOT_OK_RETURN(status);
 693
 694         return status;
 695 }
 696
 697 static NTSTATUS wreplsrv_pull_cycle_apply_records(struct wreplsrv_pull_cycle_state *state)
 698 {
 699         NTSTATUS status;
 700
 701         status = wreplsrv_apply_records(state->io->in.partner,
 702                                         &state->names_io.in.owner,
 703                                         state->names_io.out.num_names,
 704                                         state->names_io.out.names);
 705         NT_STATUS_NOT_OK_RETURN(status);
 706
 707         talloc_free(state->names_io.out.names);
 708         ZERO_STRUCT(state->names_io);
 709
 710         return NT_STATUS_OK;
 711 }
 712
 713 static NTSTATUS wreplsrv_pull_cycle_wait_send_replies(struct wreplsrv_pull_cycle_state *state)
 714 {
 715         NTSTATUS status;
 716
 717         status = wreplsrv_pull_names_recv(state->creq, state, &state->names_io);
 718         NT_STATUS_NOT_OK_RETURN(status);
 719
 720         /*
 721          * TODO: this should maybe an async call,
 722          *       because we may need some network access
 723          *       for conflict resolving
 724          */
 725         status = wreplsrv_pull_cycle_apply_records(state);
 726         NT_STATUS_NOT_OK_RETURN(status);
 727
 728         status = wreplsrv_pull_cycle_next_owner_wrapper(state);
 729         NT_STATUS_NOT_OK_RETURN(status);
 730
 731         return status;
 732 }
 733
 734 static NTSTATUS wreplsrv_pull_cycle_wait_stop_assoc(struct wreplsrv_pull_cycle_state *state)
 735 {
 736         NTSTATUS status;
 737
 738         status = wrepl_associate_stop_recv(state->subreq, &state->assoc_stop_io);
 739         TALLOC_FREE(state->subreq);
 740         NT_STATUS_NOT_OK_RETURN(status);
 741
 742         state->stage = WREPLSRV_PULL_CYCLE_STAGE_DONE;
 743
 744         return status;
 745 }
 746
 747 static void wreplsrv_pull_cycle_handler(struct wreplsrv_pull_cycle_state *state)
 748 {
 749         struct composite_context *c = state->c;
 750
 751         switch (state->stage) {
 752         case WREPLSRV_PULL_CYCLE_STAGE_WAIT_TABLE_REPLY:
 753                 c->status = wreplsrv_pull_cycle_wait_table_reply(state);
 754                 break;
 755         case WREPLSRV_PULL_CYCLE_STAGE_WAIT_SEND_REPLIES:
 756                 c->status = wreplsrv_pull_cycle_wait_send_replies(state);
 757                 break;
 758         case WREPLSRV_PULL_CYCLE_STAGE_WAIT_STOP_ASSOC:
 759                 c->status = wreplsrv_pull_cycle_wait_stop_assoc(state);
 760                 break;
 761         case WREPLSRV_PULL_CYCLE_STAGE_DONE:
 762                 c->status = NT_STATUS_INTERNAL_ERROR;
 763         }
 764
 765         if (state->stage == WREPLSRV_PULL_CYCLE_STAGE_DONE) {
 766                 c->state  = COMPOSITE_STATE_DONE;
 767         }
 768
 769         if (!NT_STATUS_IS_OK(c->status)) {
 770                 c->state = COMPOSITE_STATE_ERROR;
 771         }
 772
 773         if (c->state >= COMPOSITE_STATE_DONE && c->async.fn) {
 774                 c->async.fn(c);
 775         }
 776 }
 777
 778 static void wreplsrv_pull_cycle_handler_creq(struct composite_context *creq)
 779 {
 780         struct wreplsrv_pull_cycle_state *state = talloc_get_type(creq->async.private_data,
 781                                                   struct wreplsrv_pull_cycle_state);
 782         wreplsrv_pull_cycle_handler(state);
 783         return;
 784 }
 785
 786 static void wreplsrv_pull_cycle_handler_treq(struct tevent_req *subreq)
 787 {
 788         struct wreplsrv_pull_cycle_state *state = tevent_req_callback_data(subreq,
 789                                                   struct wreplsrv_pull_cycle_state);
 790         wreplsrv_pull_cycle_handler(state);
 791         return;
 792 }
 793
 794 struct composite_context *wreplsrv_pull_cycle_send(TALLOC_CTX *mem_ctx, struct wreplsrv_pull_cycle_io *io)
 795 {
 796         struct composite_context *c = NULL;
 797         struct wreplsrv_service *service = io->in.partner->service;
 798         struct wreplsrv_pull_cycle_state *state = NULL;
 799
 800         c = talloc_zero(mem_ctx, struct composite_context);
 801         if (!c) goto failed;
 802
 803         state = talloc_zero(c, struct wreplsrv_pull_cycle_state);
 804         if (!state) goto failed;
 805         state->c        = c;
 806         state->io       = io;
 807
 808         c->state        = COMPOSITE_STATE_IN_PROGRESS;
 809         c->event_ctx    = service->task->event_ctx;
 810         c->private_data = state;
 811
 812         state->stage    = WREPLSRV_PULL_CYCLE_STAGE_WAIT_TABLE_REPLY;
 813         state->table_io.in.partner      = io->in.partner;
 814         state->table_io.in.num_owners   = io->in.num_owners;
 815         state->table_io.in.owners       = io->in.owners;
 816         state->creq = wreplsrv_pull_table_send(state, &state->table_io);
 817         if (!state->creq) goto failed;
 818
 819         state->creq->async.fn           = wreplsrv_pull_cycle_handler_creq;
 820         state->creq->async.private_data = state;
 821
 822         return c;
 823 failed:
 824         talloc_free(c);
 825         return NULL;
 826 }
 827
 828 NTSTATUS wreplsrv_pull_cycle_recv(struct composite_context *c)
 829 {
 830         NTSTATUS status;
 831
 832         status = composite_wait(c);
 833
 834         talloc_free(c);
 835         return status;
 836 }
 837
 838 enum wreplsrv_push_notify_stage {
 839         WREPLSRV_PUSH_NOTIFY_STAGE_WAIT_CONNECT,
 840         WREPLSRV_PUSH_NOTIFY_STAGE_WAIT_UPDATE,
 841         WREPLSRV_PUSH_NOTIFY_STAGE_WAIT_INFORM,
 842         WREPLSRV_PUSH_NOTIFY_STAGE_DONE
 843 };
 844
 845 struct wreplsrv_push_notify_state {
 846         enum wreplsrv_push_notify_stage stage;
 847         struct composite_context *c;
 848         struct wreplsrv_push_notify_io *io;
 849         enum wrepl_replication_cmd command;
 850         bool full_table;
 851         struct wrepl_send_ctrl ctrl;
 852         struct wrepl_packet req_packet;
 853         struct wrepl_packet *rep_packet;
 854         struct composite_context *creq;
 855         struct wreplsrv_out_connection *wreplconn;
 856         struct tevent_req *subreq;
 857 };
 858
 859 static void wreplsrv_push_notify_handler_creq(struct composite_context *creq);
 860 static void wreplsrv_push_notify_handler_treq(struct tevent_req *subreq);
 861
 862 static NTSTATUS wreplsrv_push_notify_update(struct wreplsrv_push_notify_state *state)
 863 {
 864         struct wreplsrv_service *service = state->io->in.partner->service;
 865         struct wrepl_packet *req = &state->req_packet;
 866         struct wrepl_replication *repl_out = &state->req_packet.message.replication;
 867         struct wrepl_table *table_out = &state->req_packet.message.replication.info.table;
 868         NTSTATUS status;
 869
 870         /* prepare the outgoing request */
 871         req->opcode     = WREPL_OPCODE_BITS;
 872         req->assoc_ctx  = state->wreplconn->assoc_ctx.peer_ctx;
 873         req->mess_type  = WREPL_REPLICATION;
 874
 875         repl_out->command = state->command;
 876
 877         status = wreplsrv_fill_wrepl_table(service, state, table_out,
 878                                            service->wins_db->local_owner, state->full_table);
 879         NT_STATUS_NOT_OK_RETURN(status);
 880
 881         /* queue the request */
 882         state->subreq = wrepl_request_send(state,
 883                                            state->wreplconn->service->task->event_ctx,
 884                                            state->wreplconn->sock, req, NULL);
 885         NT_STATUS_HAVE_NO_MEMORY(state->subreq);
 886
 887         tevent_req_set_callback(state->subreq,
 888                                 wreplsrv_push_notify_handler_treq,
 889                                 state);
 890
 891         state->stage = WREPLSRV_PUSH_NOTIFY_STAGE_WAIT_UPDATE;
 892
 893         return NT_STATUS_OK;
 894 }
 895
 896 static NTSTATUS wreplsrv_push_notify_inform(struct wreplsrv_push_notify_state *state)
 897 {
 898         struct wreplsrv_service *service = state->io->in.partner->service;
 899         struct wrepl_packet *req = &state->req_packet;
 900         struct wrepl_replication *repl_out = &state->req_packet.message.replication;
 901         struct wrepl_table *table_out = &state->req_packet.message.replication.info.table;
 902         NTSTATUS status;
 903
 904         req->opcode     = WREPL_OPCODE_BITS;
 905         req->assoc_ctx  = state->wreplconn->assoc_ctx.peer_ctx;
 906         req->mess_type  = WREPL_REPLICATION;
 907
 908         repl_out->command = state->command;
 909
 910         status = wreplsrv_fill_wrepl_table(service, state, table_out,
 911                                            service->wins_db->local_owner, state->full_table);
 912         NT_STATUS_NOT_OK_RETURN(status);
 913
 914         /* we won't get a reply to a inform message */
 915         state->ctrl.send_only           = true;
 916
 917         state->subreq = wrepl_request_send(state,
 918                                            state->wreplconn->service->task->event_ctx,
 919                                            state->wreplconn->sock, req, &state->ctrl);
 920         NT_STATUS_HAVE_NO_MEMORY(state->subreq);
 921
 922         tevent_req_set_callback(state->subreq,
 923                                 wreplsrv_push_notify_handler_treq,
 924                                 state);
 925
 926         state->stage = WREPLSRV_PUSH_NOTIFY_STAGE_WAIT_INFORM;
 927
 928         return NT_STATUS_OK;
 929 }
 930
 931 static NTSTATUS wreplsrv_push_notify_wait_connect(struct wreplsrv_push_notify_state *state)
 932 {
 933         NTSTATUS status;
 934
 935         status = wreplsrv_out_connect_recv(state->creq, state, &state->wreplconn);
 936         NT_STATUS_NOT_OK_RETURN(status);
 937
 938         /* is the peer doesn't support inform fallback to update */
 939         switch (state->command) {
 940         case WREPL_REPL_INFORM:
 941                 if (state->wreplconn->assoc_ctx.peer_major < 5) {
 942                         state->command = WREPL_REPL_UPDATE;
 943                 }
 944                 break;
 945         case WREPL_REPL_INFORM2:
 946                 if (state->wreplconn->assoc_ctx.peer_major < 5) {
 947                         state->command = WREPL_REPL_UPDATE2;
 948                 }
 949                 break;
 950         default:
 951                 break;
 952         }
 953
 954         switch (state->command) {
 955         case WREPL_REPL_UPDATE:
 956                 state->full_table = true;
 957                 return wreplsrv_push_notify_update(state);
 958         case WREPL_REPL_UPDATE2:
 959                 state->full_table = false;
 960                 return wreplsrv_push_notify_update(state);
 961         case WREPL_REPL_INFORM:
 962                 state->full_table = true;
 963                 return wreplsrv_push_notify_inform(state);
 964         case WREPL_REPL_INFORM2:
 965                 state->full_table = false;
 966                 return wreplsrv_push_notify_inform(state);
 967         default:
 968                 return NT_STATUS_INTERNAL_ERROR;
 969         }
 970
 971         return NT_STATUS_INTERNAL_ERROR;
 972 }
 973
 974 static NTSTATUS wreplsrv_push_notify_wait_update(struct wreplsrv_push_notify_state *state)
 975 {
 976         struct wreplsrv_in_connection *wrepl_in;
 977         struct tstream_context *stream;
 978         NTSTATUS status;
 979
 980         status = wrepl_request_recv(state->subreq, state, NULL);
 981         TALLOC_FREE(state->subreq);
 982         NT_STATUS_NOT_OK_RETURN(status);
 983
 984         /*
 985          * now we need to convert the wrepl_socket (client connection)
 986          * into a wreplsrv_in_connection (server connection), because
 987          * we'll act as a server on this connection after the WREPL_REPL_UPDATE*
 988          * message is received by the peer.
 989          */
 990
 991         status = wrepl_socket_split_stream(state->wreplconn->sock, state, &stream);
 992         NT_STATUS_NOT_OK_RETURN(status);
 993
 994         /*
 995          * now create a wreplsrv_in_connection,
 996          * on which we act as server
 997          *
 998          * NOTE: stream will be stolen by
 999          *       wreplsrv_in_connection_merge()
1000          */
1001         status = wreplsrv_in_connection_merge(state->io->in.partner,
1002                                               state->wreplconn->assoc_ctx.peer_ctx,
1003                                               &stream,
1004                                               &wrepl_in);
1005         NT_STATUS_NOT_OK_RETURN(status);
1006
1007         /* now we can free the wreplsrv_out_connection */
1008         TALLOC_FREE(state->wreplconn);
1009
1010         state->stage = WREPLSRV_PUSH_NOTIFY_STAGE_DONE;
1011         return NT_STATUS_OK;
1012 }
1013
1014 static NTSTATUS wreplsrv_push_notify_wait_inform(struct wreplsrv_push_notify_state *state)
1015 {
1016         NTSTATUS status;
1017
1018         status = wrepl_request_recv(state->subreq, state, NULL);
1019         TALLOC_FREE(state->subreq);
1020         NT_STATUS_NOT_OK_RETURN(status);
1021
1022         state->stage = WREPLSRV_PUSH_NOTIFY_STAGE_DONE;
1023         return status;
1024 }
1025
1026 static void wreplsrv_push_notify_handler(struct wreplsrv_push_notify_state *state)
1027 {
1028         struct composite_context *c = state->c;
1029
1030         switch (state->stage) {
1031         case WREPLSRV_PUSH_NOTIFY_STAGE_WAIT_CONNECT:
1032                 c->status = wreplsrv_push_notify_wait_connect(state);
1033                 break;
1034         case WREPLSRV_PUSH_NOTIFY_STAGE_WAIT_UPDATE:
1035                 c->status = wreplsrv_push_notify_wait_update(state);
1036                 break;
1037         case WREPLSRV_PUSH_NOTIFY_STAGE_WAIT_INFORM:
1038                 c->status = wreplsrv_push_notify_wait_inform(state);
1039                 break;
1040         case WREPLSRV_PUSH_NOTIFY_STAGE_DONE:
1041                 c->status = NT_STATUS_INTERNAL_ERROR;
1042         }
1043
1044         if (state->stage == WREPLSRV_PUSH_NOTIFY_STAGE_DONE) {
1045                 c->state  = COMPOSITE_STATE_DONE;
1046         }
1047
1048         if (!NT_STATUS_IS_OK(c->status)) {
1049                 c->state = COMPOSITE_STATE_ERROR;
1050         }
1051
1052         if (c->state >= COMPOSITE_STATE_DONE && c->async.fn) {
1053                 c->async.fn(c);
1054         }
1055 }
1056
1057 static void wreplsrv_push_notify_handler_creq(struct composite_context *creq)
1058 {
1059         struct wreplsrv_push_notify_state *state = talloc_get_type(creq->async.private_data,
1060                                                    struct wreplsrv_push_notify_state);
1061         wreplsrv_push_notify_handler(state);
1062         return;
1063 }
1064
1065 static void wreplsrv_push_notify_handler_treq(struct tevent_req *subreq)
1066 {
1067         struct wreplsrv_push_notify_state *state = tevent_req_callback_data(subreq,
1068                                                    struct wreplsrv_push_notify_state);
1069         wreplsrv_push_notify_handler(state);
1070         return;
1071 }
1072
1073 struct composite_context *wreplsrv_push_notify_send(TALLOC_CTX *mem_ctx, struct wreplsrv_push_notify_io *io)
1074 {
1075         struct composite_context *c = NULL;
1076         struct wreplsrv_service *service = io->in.partner->service;
1077         struct wreplsrv_push_notify_state *state = NULL;
1078         enum winsrepl_partner_type partner_type;
1079
1080         c = talloc_zero(mem_ctx, struct composite_context);
1081         if (!c) goto failed;
1082
1083         state = talloc_zero(c, struct wreplsrv_push_notify_state);
1084         if (!state) goto failed;
1085         state->c        = c;
1086         state->io       = io;
1087
1088         if (io->in.inform) {
1089                 /* we can cache the connection in partner->push->wreplconn */
1090                 partner_type = WINSREPL_PARTNER_PUSH;
1091                 if (io->in.propagate) {
1092                         state->command  = WREPL_REPL_INFORM2;
1093                 } else {
1094                         state->command  = WREPL_REPL_INFORM;
1095                 }
1096         } else {
1097                 /* we can NOT cache the connection */
1098                 partner_type = WINSREPL_PARTNER_NONE;
1099                 if (io->in.propagate) {
1100                         state->command  = WREPL_REPL_UPDATE2;
1101                 } else {
1102                         state->command  = WREPL_REPL_UPDATE;
1103                 }
1104         }
1105
1106         c->state        = COMPOSITE_STATE_IN_PROGRESS;
1107         c->event_ctx    = service->task->event_ctx;
1108         c->private_data = state;
1109
1110         state->stage    = WREPLSRV_PUSH_NOTIFY_STAGE_WAIT_CONNECT;
1111         state->creq     = wreplsrv_out_connect_send(io->in.partner, partner_type, NULL);
1112         if (!state->creq) goto failed;
1113
1114         state->creq->async.fn           = wreplsrv_push_notify_handler_creq;
1115         state->creq->async.private_data = state;
1116
1117         return c;
1118 failed:
1119         talloc_free(c);
1120         return NULL;
1121 }
1122
1123 NTSTATUS wreplsrv_push_notify_recv(struct composite_context *c)
1124 {
1125         NTSTATUS status;
1126
1127         status = composite_wait(c);
1128
1129         talloc_free(c);
1130         return status;
1131 }