source3/smbd/smb2_server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   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 #include "includes.h"
  22 #include "smbd/globals.h"
  23 #include "../source4/libcli/smb2/smb2_constants.h"
  24 #include "../lib/tsocket/tsocket.h"
  25
  26 bool smbd_is_smb2_header(const uint8_t *inbuf, size_t size)
  27 {
  28         if (size < (4 + SMB2_HDR_BODY)) {
  29                 return false;
  30         }
  31
  32         if (IVAL(inbuf, 4) != SMB2_MAGIC) {
  33                 return false;
  34         }
  35
  36         return true;
  37 }
  38
  39 static NTSTATUS smbd_initialize_smb2(struct smbd_server_connection *conn)
  40 {
  41         NTSTATUS status;
  42         int ret;
  43
  44         TALLOC_FREE(conn->smb1.fde);
  45
  46         conn->smb2.event_ctx = smbd_event_context();
  47
  48         conn->smb2.recv_queue = tevent_queue_create(conn, "smb2 recv queue");
  49         if (conn->smb2.recv_queue == NULL) {
  50                 return NT_STATUS_NO_MEMORY;
  51         }
  52
  53         conn->smb2.send_queue = tevent_queue_create(conn, "smb2 send queue");
  54         if (conn->smb2.send_queue == NULL) {
  55                 return NT_STATUS_NO_MEMORY;
  56         }
  57
  58         conn->smb2.sessions.idtree = idr_init(conn);
  59         if (conn->smb2.sessions.idtree == NULL) {
  60                 return NT_STATUS_NO_MEMORY;
  61         }
  62         conn->smb2.sessions.limit = 0x0000FFFE;
  63         conn->smb2.sessions.list = NULL;
  64
  65         ret = tstream_bsd_existing_socket(conn, smbd_server_fd(),
  66                                           &conn->smb2.stream);
  67         if (ret == -1) {
  68                 status = map_nt_error_from_unix(errno);
  69                 return status;
  70         }
  71
  72         /* Ensure child is set to non-blocking mode */
  73         set_blocking(smbd_server_fd(),false);
  74         return NT_STATUS_OK;
  75 }
  76
  77 #define smb2_len(buf) (PVAL(buf,3)|(PVAL(buf,2)<<8)|(PVAL(buf,1)<<16))
  78 #define _smb2_setlen(_buf,len) do { \
  79         uint8_t *buf = (uint8_t *)_buf; \
  80         buf[0] = 0; \
  81         buf[1] = ((len)&0xFF0000)>>16; \
  82         buf[2] = ((len)&0xFF00)>>8; \
  83         buf[3] = (len)&0xFF; \
  84 } while (0)
  85
  86 static void smb2_setup_nbt_length(struct iovec *vector, int count)
  87 {
  88         size_t len = 0;
  89         int i;
  90
  91         for (i=1; i < count; i++) {
  92                 len += vector[i].iov_len;
  93         }
  94
  95         _smb2_setlen(vector[0].iov_base, len);
  96 }
  97
  98 static NTSTATUS smbd_smb2_request_create(struct smbd_server_connection *conn,
  99                                          const uint8_t *inbuf, size_t size,
 100                                          struct smbd_smb2_request **_req)
 101 {
 102         TALLOC_CTX *mem_pool;
 103         struct smbd_smb2_request *req;
 104         uint32_t protocol_version;
 105         const uint8_t *inhdr = NULL;
 106         off_t ofs = 0;
 107         uint16_t cmd;
 108         uint32_t next_command_ofs;
 109
 110         if (size < (4 + SMB2_HDR_BODY + 2)) {
 111                 DEBUG(0,("Invalid SMB2 packet length count %ld\n", (long)size));
 112                 return NT_STATUS_INVALID_PARAMETER;
 113         }
 114
 115         inhdr = inbuf + 4;
 116
 117         protocol_version = IVAL(inhdr, SMB2_HDR_PROTOCOL_ID);
 118         if (protocol_version != SMB2_MAGIC) {
 119                 DEBUG(0,("Invalid SMB packet: protocol prefix: 0x%08X\n",
 120                          protocol_version));
 121                 return NT_STATUS_INVALID_PARAMETER;
 122         }
 123
 124         cmd = SVAL(inhdr, SMB2_HDR_OPCODE);
 125         if (cmd != SMB2_OP_NEGPROT) {
 126                 DEBUG(0,("Invalid SMB packet: first request: 0x%04X\n",
 127                          cmd));
 128                 return NT_STATUS_INVALID_PARAMETER;
 129         }
 130
 131         next_command_ofs = IVAL(inhdr, SMB2_HDR_NEXT_COMMAND);
 132         if (next_command_ofs != 0) {
 133                 DEBUG(0,("Invalid SMB packet: next_command: 0x%08X\n",
 134                          next_command_ofs));
 135                 return NT_STATUS_INVALID_PARAMETER;
 136         }
 137
 138         mem_pool = talloc_pool(conn, 8192);
 139         if (mem_pool == NULL) {
 140                 return NT_STATUS_NO_MEMORY;
 141         }
 142
 143         req = talloc_zero(mem_pool, struct smbd_smb2_request);
 144         if (req == NULL) {
 145                 talloc_free(mem_pool);
 146                 return NT_STATUS_NO_MEMORY;
 147         }
 148         req->mem_pool   = mem_pool;
 149         req->conn       = conn;
 150
 151         talloc_steal(req, inbuf);
 152
 153         req->in.vector = talloc_array(req, struct iovec, 4);
 154         if (req->in.vector == NULL) {
 155                 talloc_free(mem_pool);
 156                 return NT_STATUS_NO_MEMORY;
 157         }
 158         req->in.vector_count = 4;
 159
 160         memcpy(req->in.nbt_hdr, inbuf, 4);
 161
 162         ofs = 0;
 163         req->in.vector[0].iov_base      = (void *)req->in.nbt_hdr;
 164         req->in.vector[0].iov_len       = 4;
 165         ofs += req->in.vector[0].iov_len;
 166
 167         req->in.vector[1].iov_base      = (void *)(inbuf + ofs);
 168         req->in.vector[1].iov_len       = SMB2_HDR_BODY;
 169         ofs += req->in.vector[1].iov_len;
 170
 171         req->in.vector[2].iov_base      = (void *)(inbuf + ofs);
 172         req->in.vector[2].iov_len       = SVAL(inbuf, ofs) & 0xFFFE;
 173         ofs += req->in.vector[2].iov_len;
 174
 175         if (ofs > size) {
 176                 return NT_STATUS_INVALID_PARAMETER;
 177         }
 178
 179         req->in.vector[3].iov_base      = (void *)(inbuf + ofs);
 180         req->in.vector[3].iov_len       = size - ofs;
 181         ofs += req->in.vector[3].iov_len;
 182
 183         req->current_idx = 1;
 184
 185         *_req = req;
 186         return NT_STATUS_OK;
 187 }
 188
 189 static NTSTATUS smbd_smb2_request_validate(struct smbd_smb2_request *req)
 190 {
 191         int count;
 192         int idx;
 193         bool compound_related = false;
 194
 195         count = req->in.vector_count;
 196
 197         if (count < 4) {
 198                 /* It's not a SMB2 request */
 199                 return NT_STATUS_INVALID_PARAMETER;
 200         }
 201
 202         for (idx=1; idx < count; idx += 3) {
 203                 const uint8_t *inhdr = NULL;
 204                 uint32_t flags;
 205
 206                 if (req->in.vector[idx].iov_len != SMB2_HDR_BODY) {
 207                         return NT_STATUS_INVALID_PARAMETER;
 208                 }
 209
 210                 if (req->in.vector[idx+1].iov_len < 2) {
 211                         return NT_STATUS_INVALID_PARAMETER;
 212                 }
 213
 214                 inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
 215
 216                 /* setup the SMB2 header */
 217                 if (IVAL(inhdr, SMB2_HDR_PROTOCOL_ID) != SMB2_MAGIC) {
 218                         return NT_STATUS_INVALID_PARAMETER;
 219                 }
 220
 221                 flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 222                 if (idx == 1) {
 223                         /*
 224                          * the 1st request should never have the
 225                          * SMB2_HDR_FLAG_CHAINED flag set
 226                          */
 227                         if (flags & SMB2_HDR_FLAG_CHAINED) {
 228                                 req->next_status = NT_STATUS_INVALID_PARAMETER;
 229                                 return NT_STATUS_OK;
 230                         }
 231                 } else if (idx == 4) {
 232                         /*
 233                          * the 2nd request triggers related vs. unrelated
 234                          * compounded requests
 235                          */
 236                         if (flags & SMB2_HDR_FLAG_CHAINED) {
 237                                 compound_related = true;
 238                         }
 239                 } else if (idx > 4) {
 240                         /*
 241                          * all other requests should match the 2nd one
 242                          */
 243                         if (flags & SMB2_HDR_FLAG_CHAINED) {
 244                                 if (!compound_related) {
 245                                         req->next_status =
 246                                                 NT_STATUS_INVALID_PARAMETER;
 247                                         return NT_STATUS_OK;
 248                                 }
 249                         } else {
 250                                 if (compound_related) {
 251                                         req->next_status =
 252                                                 NT_STATUS_INVALID_PARAMETER;
 253                                         return NT_STATUS_OK;
 254                                 }
 255                         }
 256                 }
 257         }
 258
 259         return NT_STATUS_OK;
 260 }
 261
 262 static NTSTATUS smbd_smb2_request_setup_out(struct smbd_smb2_request *req)
 263 {
 264         struct iovec *vector;
 265         int count;
 266         int idx;
 267
 268         count = req->in.vector_count;
 269         vector = talloc_array(req, struct iovec, count);
 270         if (vector == NULL) {
 271                 return NT_STATUS_NO_MEMORY;
 272         }
 273
 274         vector[0].iov_base      = req->out.nbt_hdr;
 275         vector[0].iov_len       = 4;
 276         SIVAL(req->out.nbt_hdr, 0, 0);
 277
 278         for (idx=1; idx < count; idx += 3) {
 279                 const uint8_t *inhdr = NULL;
 280                 uint8_t *outhdr = NULL;
 281                 uint8_t *outbody = NULL;
 282                 uint32_t next_command_ofs = 0;
 283                 struct iovec *current = &vector[idx];
 284
 285                 if ((idx + 3) < count) {
 286                         /* we have a next command */
 287                         next_command_ofs = SMB2_HDR_BODY + 8;
 288                 }
 289
 290                 inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
 291
 292                 outhdr = talloc_array(vector, uint8_t,
 293                                       SMB2_HDR_BODY + 8);
 294                 if (outhdr == NULL) {
 295                         return NT_STATUS_NO_MEMORY;
 296                 }
 297
 298                 outbody = outhdr + SMB2_HDR_BODY;
 299
 300                 current[0].iov_base     = (void *)outhdr;
 301                 current[0].iov_len      = SMB2_HDR_BODY;
 302
 303                 current[1].iov_base     = (void *)outbody;
 304                 current[1].iov_len      = 8;
 305
 306                 current[2].iov_base     = NULL;
 307                 current[2].iov_len      = 0;
 308
 309                 /* setup the SMB2 header */
 310                 SIVAL(outhdr, SMB2_HDR_PROTOCOL_ID,     SMB2_MAGIC);
 311                 SSVAL(outhdr, SMB2_HDR_LENGTH,          SMB2_HDR_BODY);
 312                 SSVAL(outhdr, SMB2_HDR_EPOCH,           0);
 313                 SIVAL(outhdr, SMB2_HDR_STATUS,
 314                       NT_STATUS_V(NT_STATUS_INTERNAL_ERROR));
 315                 SSVAL(outhdr, SMB2_HDR_OPCODE,
 316                       SVAL(inhdr, SMB2_HDR_OPCODE));
 317                 /* Make up a number for now... JRA. FIXME ! FIXME !*/
 318                 SSVAL(outhdr, SMB2_HDR_CREDIT,          20);
 319                 SIVAL(outhdr, SMB2_HDR_FLAGS,           SMB2_HDR_FLAG_REDIRECT);
 320                 SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND,    next_command_ofs);
 321                 SBVAL(outhdr, SMB2_HDR_MESSAGE_ID,
 322                       BVAL(inhdr, SMB2_HDR_MESSAGE_ID));
 323                 SIVAL(outhdr, SMB2_HDR_PID,
 324                       IVAL(inhdr, SMB2_HDR_PID));
 325                 SIVAL(outhdr, SMB2_HDR_TID,
 326                       IVAL(inhdr, SMB2_HDR_TID));
 327                 SBVAL(outhdr, SMB2_HDR_SESSION_ID,
 328                       BVAL(inhdr, SMB2_HDR_SESSION_ID));
 329                 memset(outhdr + SMB2_HDR_SIGNATURE, 0, 16);
 330
 331                 /* setup error body header */
 332                 SSVAL(outbody, 0x00, 0x08 + 1);
 333                 SSVAL(outbody, 0x02, 0);
 334                 SIVAL(outbody, 0x04, 0);
 335         }
 336
 337         req->out.vector = vector;
 338         req->out.vector_count = count;
 339
 340         /* setup the length of the NBT packet */
 341         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 342
 343         return NT_STATUS_OK;
 344 }
 345
 346 void smbd_server_connection_terminate_ex(struct smbd_server_connection *sconn,
 347                                          const char *reason,
 348                                          const char *location)
 349 {
 350         DEBUG(10,("smbd_server_connection_terminate_ex: reason[%s] at %s\n",
 351                   reason, location));
 352         exit_server_cleanly(reason);
 353 }
 354
 355 static NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 356 {
 357         const uint8_t *inhdr;
 358         int i = req->current_idx;
 359         uint16_t opcode;
 360         uint32_t flags;
 361         NTSTATUS status;
 362         NTSTATUS session_status;
 363
 364         inhdr = (const uint8_t *)req->in.vector[i].iov_base;
 365
 366         /* TODO: verify more things */
 367
 368         flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 369         opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
 370         DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
 371
 372 #define TMP_SMB2_ALLOWED_FLAGS ( \
 373         SMB2_HDR_FLAG_CHAINED | \
 374         SMB2_HDR_FLAG_SIGNED | \
 375         SMB2_HDR_FLAG_DFS)
 376         if ((flags & ~TMP_SMB2_ALLOWED_FLAGS) != 0) {
 377                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 378         }
 379 #undef TMP_SMB2_ALLOWED_FLAGS
 380
 381         session_status = smbd_smb2_request_check_session(req);
 382
 383         req->do_signing = false;
 384         if (flags & SMB2_HDR_FLAG_SIGNED) {
 385                 if (!NT_STATUS_IS_OK(session_status)) {
 386                         return smbd_smb2_request_error(req, session_status);
 387                 }
 388
 389                 req->do_signing = true;
 390                 status = smb2_signing_check_pdu(req->session->session_key,
 391                                                 &req->in.vector[i], 3);
 392                 if (!NT_STATUS_IS_OK(status)) {
 393                         return smbd_smb2_request_error(req, status);
 394                 }
 395         } else if (req->session && req->session->do_signing) {
 396                 return smbd_smb2_request_error(req, NT_STATUS_ACCESS_DENIED);
 397         }
 398
 399         /*
 400          * This check is mostly for giving the correct error code
 401          * for compounded requests.
 402          *
 403          * TODO: we may need to move this after the session and tcon checks.
 404          */
 405         if (!NT_STATUS_IS_OK(req->next_status)) {
 406                 return smbd_smb2_request_error(req, req->next_status);
 407         }
 408
 409         switch (opcode) {
 410         case SMB2_OP_NEGPROT:
 411                 return smbd_smb2_request_process_negprot(req);
 412
 413         case SMB2_OP_SESSSETUP:
 414                 return smbd_smb2_request_process_sesssetup(req);
 415
 416         case SMB2_OP_LOGOFF:
 417                 if (!NT_STATUS_IS_OK(session_status)) {
 418                         return smbd_smb2_request_error(req, session_status);
 419                 }
 420                 return smbd_smb2_request_process_logoff(req);
 421
 422         case SMB2_OP_TCON:
 423                 if (!NT_STATUS_IS_OK(session_status)) {
 424                         return smbd_smb2_request_error(req, session_status);
 425                 }
 426                 status = smbd_smb2_request_check_session(req);
 427                 if (!NT_STATUS_IS_OK(status)) {
 428                         return smbd_smb2_request_error(req, status);
 429                 }
 430                 return smbd_smb2_request_process_tcon(req);
 431
 432         case SMB2_OP_TDIS:
 433                 if (!NT_STATUS_IS_OK(session_status)) {
 434                         return smbd_smb2_request_error(req, session_status);
 435                 }
 436                 status = smbd_smb2_request_check_tcon(req);
 437                 if (!NT_STATUS_IS_OK(status)) {
 438                         return smbd_smb2_request_error(req, status);
 439                 }
 440                 return smbd_smb2_request_process_tdis(req);
 441
 442         case SMB2_OP_CREATE:
 443                 if (!NT_STATUS_IS_OK(session_status)) {
 444                         return smbd_smb2_request_error(req, session_status);
 445                 }
 446                 status = smbd_smb2_request_check_tcon(req);
 447                 if (!NT_STATUS_IS_OK(status)) {
 448                         return smbd_smb2_request_error(req, status);
 449                 }
 450                 return smbd_smb2_request_process_create(req);
 451
 452         case SMB2_OP_CLOSE:
 453                 if (!NT_STATUS_IS_OK(session_status)) {
 454                         return smbd_smb2_request_error(req, session_status);
 455                 }
 456                 status = smbd_smb2_request_check_tcon(req);
 457                 if (!NT_STATUS_IS_OK(status)) {
 458                         return smbd_smb2_request_error(req, status);
 459                 }
 460                 return smbd_smb2_request_process_close(req);
 461
 462         case SMB2_OP_FLUSH:
 463                 if (!NT_STATUS_IS_OK(session_status)) {
 464                         return smbd_smb2_request_error(req, session_status);
 465                 }
 466                 status = smbd_smb2_request_check_tcon(req);
 467                 if (!NT_STATUS_IS_OK(status)) {
 468                         return smbd_smb2_request_error(req, status);
 469                 }
 470                 return smbd_smb2_request_process_flush(req);
 471
 472         case SMB2_OP_READ:
 473                 if (!NT_STATUS_IS_OK(session_status)) {
 474                         return smbd_smb2_request_error(req, session_status);
 475                 }
 476                 status = smbd_smb2_request_check_tcon(req);
 477                 if (!NT_STATUS_IS_OK(status)) {
 478                         return smbd_smb2_request_error(req, status);
 479                 }
 480                 return smbd_smb2_request_process_read(req);
 481
 482         case SMB2_OP_WRITE:
 483                 if (!NT_STATUS_IS_OK(session_status)) {
 484                         return smbd_smb2_request_error(req, session_status);
 485                 }
 486                 status = smbd_smb2_request_check_tcon(req);
 487                 if (!NT_STATUS_IS_OK(status)) {
 488                         return smbd_smb2_request_error(req, status);
 489                 }
 490                 return smbd_smb2_request_process_write(req);
 491
 492         case SMB2_OP_LOCK:
 493                 if (!NT_STATUS_IS_OK(session_status)) {
 494                         return smbd_smb2_request_error(req, session_status);
 495                 }
 496                 status = smbd_smb2_request_check_tcon(req);
 497                 if (!NT_STATUS_IS_OK(status)) {
 498                         return smbd_smb2_request_error(req, status);
 499                 }
 500                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 501
 502         case SMB2_OP_IOCTL:
 503                 if (!NT_STATUS_IS_OK(session_status)) {
 504                         return smbd_smb2_request_error(req, session_status);
 505                 }
 506                 status = smbd_smb2_request_check_tcon(req);
 507                 if (!NT_STATUS_IS_OK(status)) {
 508                         return smbd_smb2_request_error(req, status);
 509                 }
 510                 return smbd_smb2_request_process_ioctl(req);
 511
 512         case SMB2_OP_CANCEL:
 513                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 514
 515         case SMB2_OP_KEEPALIVE:
 516                 return smbd_smb2_request_process_keepalive(req);
 517
 518         case SMB2_OP_FIND:
 519                 if (!NT_STATUS_IS_OK(session_status)) {
 520                         return smbd_smb2_request_error(req, session_status);
 521                 }
 522                 status = smbd_smb2_request_check_tcon(req);
 523                 if (!NT_STATUS_IS_OK(status)) {
 524                         return smbd_smb2_request_error(req, status);
 525                 }
 526                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 527
 528         case SMB2_OP_NOTIFY:
 529                 if (!NT_STATUS_IS_OK(session_status)) {
 530                         return smbd_smb2_request_error(req, session_status);
 531                 }
 532                 status = smbd_smb2_request_check_tcon(req);
 533                 if (!NT_STATUS_IS_OK(status)) {
 534                         return smbd_smb2_request_error(req, status);
 535                 }
 536                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 537
 538         case SMB2_OP_GETINFO:
 539                 if (!NT_STATUS_IS_OK(session_status)) {
 540                         return smbd_smb2_request_error(req, session_status);
 541                 }
 542                 status = smbd_smb2_request_check_tcon(req);
 543                 if (!NT_STATUS_IS_OK(status)) {
 544                         return smbd_smb2_request_error(req, status);
 545                 }
 546                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 547
 548         case SMB2_OP_SETINFO:
 549                 if (!NT_STATUS_IS_OK(session_status)) {
 550                         return smbd_smb2_request_error(req, session_status);
 551                 }
 552                 status = smbd_smb2_request_check_tcon(req);
 553                 if (!NT_STATUS_IS_OK(status)) {
 554                         return smbd_smb2_request_error(req, status);
 555                 }
 556                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 557
 558         case SMB2_OP_BREAK:
 559                 if (!NT_STATUS_IS_OK(session_status)) {
 560                         return smbd_smb2_request_error(req, session_status);
 561                 }
 562                 status = smbd_smb2_request_check_tcon(req);
 563                 if (!NT_STATUS_IS_OK(status)) {
 564                         return smbd_smb2_request_error(req, status);
 565                 }
 566                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 567         }
 568
 569         return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 570 }
 571
 572 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
 573 static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
 574
 575 static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
 576 {
 577         struct tevent_req *subreq;
 578
 579         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 580
 581         if (req->do_signing) {
 582                 int i = req->current_idx;
 583                 NTSTATUS status;
 584                 status = smb2_signing_sign_pdu(req->session->session_key,
 585                                                &req->out.vector[i], 3);
 586                 if (!NT_STATUS_IS_OK(status)) {
 587                         return status;
 588                 }
 589         }
 590
 591         req->current_idx += 3;
 592
 593         if (req->current_idx < req->out.vector_count) {
 594                 struct timeval zero = timeval_zero();
 595                 subreq = tevent_wakeup_send(req,
 596                                             req->conn->smb2.event_ctx,
 597                                             zero);
 598                 if (subreq == NULL) {
 599                         return NT_STATUS_NO_MEMORY;
 600                 }
 601                 tevent_req_set_callback(subreq,
 602                                         smbd_smb2_request_dispatch_compound,
 603                                         req);
 604
 605                 return NT_STATUS_OK;
 606         }
 607
 608         subreq = tstream_writev_queue_send(req,
 609                                            req->conn->smb2.event_ctx,
 610                                            req->conn->smb2.stream,
 611                                            req->conn->smb2.send_queue,
 612                                            req->out.vector,
 613                                            req->out.vector_count);
 614         if (subreq == NULL) {
 615                 return NT_STATUS_NO_MEMORY;
 616         }
 617         tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
 618
 619         return NT_STATUS_OK;
 620 }
 621
 622 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq)
 623 {
 624         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 625                                         struct smbd_smb2_request);
 626         struct smbd_server_connection *conn = req->conn;
 627         NTSTATUS status;
 628
 629         tevent_wakeup_recv(subreq);
 630         TALLOC_FREE(subreq);
 631
 632         DEBUG(10,("smbd_smb2_request_dispatch_compound: idx[%d] of %d vectors\n",
 633                   req->current_idx, req->in.vector_count));
 634
 635         status = smbd_smb2_request_dispatch(req);
 636         if (!NT_STATUS_IS_OK(status)) {
 637                 smbd_server_connection_terminate(conn, nt_errstr(status));
 638                 return;
 639         }
 640 }
 641
 642 static void smbd_smb2_request_writev_done(struct tevent_req *subreq)
 643 {
 644         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 645                                         struct smbd_smb2_request);
 646         struct smbd_server_connection *conn = req->conn;
 647         int ret;
 648         int sys_errno;
 649         TALLOC_CTX *mem_pool;
 650
 651         ret = tstream_writev_queue_recv(subreq, &sys_errno);
 652         TALLOC_FREE(subreq);
 653         if (ret == -1) {
 654                 NTSTATUS status = map_nt_error_from_unix(sys_errno);
 655                 smbd_server_connection_terminate(conn, nt_errstr(status));
 656                 return;
 657         }
 658
 659         mem_pool = req->mem_pool;
 660         req = NULL;
 661         talloc_free(mem_pool);
 662 }
 663
 664 NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
 665                                     NTSTATUS status,
 666                                     DATA_BLOB *info,
 667                                     const char *location)
 668 {
 669         uint8_t *outhdr;
 670         uint8_t *outbody;
 671         int i = req->current_idx;
 672
 673         DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s] |%s| at %s\n",
 674                   i, nt_errstr(status), info ? " +info" : "",
 675                   location));
 676
 677         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 678
 679         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 680
 681         outbody = outhdr + SMB2_HDR_BODY;
 682
 683         req->out.vector[i+1].iov_base = (void *)outbody;
 684         req->out.vector[i+1].iov_len = 8;
 685
 686         if (info) {
 687                 SIVAL(outbody, 0x04, info->length);
 688                 req->out.vector[i+2].iov_base   = (void *)info->data;
 689                 req->out.vector[i+2].iov_len    = info->length;
 690         } else {
 691                 req->out.vector[i+2].iov_base = NULL;
 692                 req->out.vector[i+2].iov_len = 0;
 693         }
 694
 695         /*
 696          * if a request fails, all other remaining
 697          * compounded requests should fail too
 698          */
 699         req->next_status = NT_STATUS_INVALID_PARAMETER;
 700
 701         return smbd_smb2_request_reply(req);
 702 }
 703
 704 NTSTATUS smbd_smb2_request_done_ex(struct smbd_smb2_request *req,
 705                                    NTSTATUS status,
 706                                    DATA_BLOB body, DATA_BLOB *dyn,
 707                                    const char *location)
 708 {
 709         uint8_t *outhdr;
 710         uint8_t *outdyn;
 711         int i = req->current_idx;
 712         uint32_t next_command_ofs;
 713
 714         DEBUG(10,("smbd_smb2_request_done_ex: "
 715                   "idx[%d] status[%s] body[%u] dyn[%s:%u] at %s\n",
 716                   i, nt_errstr(status), (unsigned int)body.length,
 717                   dyn ? "yes": "no",
 718                   (unsigned int)(dyn ? dyn->length : 0),
 719                   location));
 720
 721         if (body.length < 2) {
 722                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 723         }
 724
 725         if ((body.length % 2) != 0) {
 726                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 727         }
 728
 729         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 730         /* the fallback dynamic buffer */
 731         outdyn = outhdr + SMB2_HDR_BODY + 8;
 732
 733         next_command_ofs = IVAL(outhdr, SMB2_HDR_NEXT_COMMAND);
 734         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 735
 736         req->out.vector[i+1].iov_base = (void *)body.data;
 737         req->out.vector[i+1].iov_len = body.length;
 738
 739         if (dyn) {
 740                 req->out.vector[i+2].iov_base   = (void *)dyn->data;
 741                 req->out.vector[i+2].iov_len    = dyn->length;
 742         } else {
 743                 req->out.vector[i+2].iov_base = NULL;
 744                 req->out.vector[i+2].iov_len = 0;
 745         }
 746
 747         /* see if we need to recalculate the offset to the next response */
 748         if (next_command_ofs > 0) {
 749                 next_command_ofs  = SMB2_HDR_BODY;
 750                 next_command_ofs += req->out.vector[i+1].iov_len;
 751                 next_command_ofs += req->out.vector[i+2].iov_len;
 752         }
 753
 754         if ((next_command_ofs % 8) != 0) {
 755                 size_t pad_size = 8 - (next_command_ofs % 8);
 756                 if (req->out.vector[i+2].iov_len == 0) {
 757                         /*
 758                          * if the dyn buffer is empty
 759                          * we can use it to add padding
 760                          */
 761                         uint8_t *pad;
 762
 763                         pad = talloc_zero_array(req->out.vector,
 764                                                 uint8_t, pad_size);
 765                         if (pad == NULL) {
 766                                 return smbd_smb2_request_error(req,
 767                                                 NT_STATUS_NO_MEMORY);
 768                         }
 769
 770                         req->out.vector[i+2].iov_base = (void *)pad;
 771                         req->out.vector[i+2].iov_len = pad_size;
 772                 } else {
 773                         /*
 774                          * For now we copy the dynamic buffer
 775                          * and add the padding to the new buffer
 776                          */
 777                         size_t old_size;
 778                         uint8_t *old_dyn;
 779                         size_t new_size;
 780                         uint8_t *new_dyn;
 781
 782                         old_size = req->out.vector[i+2].iov_len;
 783                         old_dyn = (uint8_t *)req->out.vector[i+2].iov_base;
 784
 785                         new_size = old_size + pad_size;
 786                         new_dyn = talloc_array(req->out.vector,
 787                                                uint8_t, new_size);
 788                         if (new_dyn == NULL) {
 789                                 return smbd_smb2_request_error(req,
 790                                                 NT_STATUS_NO_MEMORY);
 791                         }
 792
 793                         memcpy(new_dyn, old_dyn, old_size);
 794                         memset(new_dyn + old_size, 0, pad_size);
 795
 796                         req->out.vector[i+2].iov_base = (void *)new_dyn;
 797                         req->out.vector[i+2].iov_len = new_size;
 798
 799                         TALLOC_FREE(old_dyn);
 800                 }
 801                 next_command_ofs += pad_size;
 802         }
 803
 804         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
 805
 806         return smbd_smb2_request_reply(req);
 807 }
 808
 809 struct smbd_smb2_request_read_state {
 810         size_t missing;
 811         bool asked_for_header;
 812         struct smbd_smb2_request *smb2_req;
 813 };
 814
 815 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 816                                          void *private_data,
 817                                          TALLOC_CTX *mem_ctx,
 818                                          struct iovec **_vector,
 819                                          size_t *_count);
 820 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
 821
 822 static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
 823                                         struct tevent_context *ev,
 824                                         struct smbd_server_connection *conn)
 825 {
 826         struct tevent_req *req;
 827         struct smbd_smb2_request_read_state *state;
 828         struct tevent_req *subreq;
 829         TALLOC_CTX *mem_pool;
 830
 831         req = tevent_req_create(mem_ctx, &state,
 832                                 struct smbd_smb2_request_read_state);
 833         if (req == NULL) {
 834                 return NULL;
 835         }
 836         state->missing = 0;
 837         state->asked_for_header = false;
 838
 839         mem_pool = talloc_pool(state, 8192);
 840         if (tevent_req_nomem(mem_pool, req)) {
 841                 return tevent_req_post(req, ev);
 842         }
 843
 844         state->smb2_req = talloc_zero(mem_pool, struct smbd_smb2_request);
 845         if (tevent_req_nomem(state->smb2_req, req)) {
 846                 return tevent_req_post(req, ev);
 847         }
 848
 849         state->smb2_req->mem_pool       = mem_pool;
 850         state->smb2_req->conn           = conn;
 851
 852         subreq = tstream_readv_pdu_queue_send(state, ev, conn->smb2.stream,
 853                                               conn->smb2.recv_queue,
 854                                               smbd_smb2_request_next_vector,
 855                                               state);
 856         if (tevent_req_nomem(subreq, req)) {
 857                 return tevent_req_post(req, ev);
 858         }
 859         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
 860
 861         return req;
 862 }
 863
 864 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 865                                          void *private_data,
 866                                          TALLOC_CTX *mem_ctx,
 867                                          struct iovec **_vector,
 868                                          size_t *_count)
 869 {
 870         struct smbd_smb2_request_read_state *state =
 871                 talloc_get_type_abort(private_data,
 872                 struct smbd_smb2_request_read_state);
 873         struct smbd_smb2_request *req = state->smb2_req;
 874         struct iovec *vector;
 875         int idx = req->in.vector_count;
 876         size_t len = 0;
 877         uint8_t *buf = NULL;
 878
 879         if (req->in.vector_count == 0) {
 880                 /*
 881                  * first we need to get the NBT header
 882                  */
 883                 req->in.vector = talloc_array(req, struct iovec,
 884                                               req->in.vector_count + 1);
 885                 if (req->in.vector == NULL) {
 886                         return -1;
 887                 }
 888                 req->in.vector_count += 1;
 889
 890                 req->in.vector[idx].iov_base    = (void *)req->in.nbt_hdr;
 891                 req->in.vector[idx].iov_len     = 4;
 892
 893                 vector = talloc_array(mem_ctx, struct iovec, 1);
 894                 if (vector == NULL) {
 895                         return -1;
 896                 }
 897
 898                 vector[0] = req->in.vector[idx];
 899
 900                 *_vector = vector;
 901                 *_count = 1;
 902                 return 0;
 903         }
 904
 905         if (req->in.vector_count == 1) {
 906                 /*
 907                  * Now we analyze the NBT header
 908                  */
 909                 state->missing = smb2_len(req->in.vector[0].iov_base);
 910
 911                 if (state->missing == 0) {
 912                         /* if there're no remaining bytes, we're done */
 913                         *_vector = NULL;
 914                         *_count = 0;
 915                         return 0;
 916                 }
 917
 918                 req->in.vector = talloc_realloc(req, req->in.vector,
 919                                                 struct iovec,
 920                                                 req->in.vector_count + 1);
 921                 if (req->in.vector == NULL) {
 922                         return -1;
 923                 }
 924                 req->in.vector_count += 1;
 925
 926                 if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
 927                         /*
 928                          * it's a special NBT message,
 929                          * so get all remaining bytes
 930                          */
 931                         len = state->missing;
 932                 } else if (state->missing < (SMB2_HDR_BODY + 2)) {
 933                         /*
 934                          * it's an invalid message, just read what we can get
 935                          * and let the caller handle the error
 936                          */
 937                         len = state->missing;
 938                 } else {
 939                         /*
 940                          * We assume it's a SMB2 request,
 941                          * and we first get the header and the
 942                          * first 2 bytes (the struct size) of the body
 943                          */
 944                         len = SMB2_HDR_BODY + 2;
 945
 946                         state->asked_for_header = true;
 947                 }
 948
 949                 state->missing -= len;
 950
 951                 buf = talloc_array(req->in.vector, uint8_t, len);
 952                 if (buf == NULL) {
 953                         return -1;
 954                 }
 955
 956                 req->in.vector[idx].iov_base    = (void *)buf;
 957                 req->in.vector[idx].iov_len     = len;
 958
 959                 vector = talloc_array(mem_ctx, struct iovec, 1);
 960                 if (vector == NULL) {
 961                         return -1;
 962                 }
 963
 964                 vector[0] = req->in.vector[idx];
 965
 966                 *_vector = vector;
 967                 *_count = 1;
 968                 return 0;
 969         }
 970
 971         if (state->missing == 0) {
 972                 /* if there're no remaining bytes, we're done */
 973                 *_vector = NULL;
 974                 *_count = 0;
 975                 return 0;
 976         }
 977
 978         if (state->asked_for_header) {
 979                 const uint8_t *hdr;
 980                 size_t full_size;
 981                 size_t next_command_ofs;
 982                 size_t body_size;
 983                 uint8_t *body;
 984                 size_t dyn_size;
 985                 uint8_t *dyn;
 986                 bool invalid = false;
 987
 988                 state->asked_for_header = false;
 989
 990                 /*
 991                  * We got the SMB2 header and the first 2 bytes
 992                  * of the body. We fix the size to just the header
 993                  * and manually copy the 2 first bytes to the body section
 994                  */
 995                 req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
 996                 hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
 997
 998                 /* allocate vectors for body and dynamic areas */
 999                 req->in.vector = talloc_realloc(req, req->in.vector,
1000                                                 struct iovec,
1001                                                 req->in.vector_count + 2);
1002                 if (req->in.vector == NULL) {
1003                         return -1;
1004                 }
1005                 req->in.vector_count += 2;
1006
1007                 full_size = state->missing + SMB2_HDR_BODY + 2;
1008                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
1009                 body_size = SVAL(hdr, SMB2_HDR_BODY);
1010
1011                 if (next_command_ofs != 0) {
1012                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
1013                                 /*
1014                                  * this is invalid, just return a zero
1015                                  * body and let the caller deal with the error
1016                                  */
1017                                 invalid = true;
1018                         } else if (next_command_ofs > full_size) {
1019                                 /*
1020                                  * this is invalid, just return a zero
1021                                  * body and let the caller deal with the error
1022                                  */
1023                                 invalid = true;
1024                         } else {
1025                                 full_size = next_command_ofs;
1026                         }
1027                 }
1028
1029                 if (!invalid) {
1030                         if (body_size < 2) {
1031                                 /*
1032                                  * this is invalid, just return a zero
1033                                  * body and let the caller deal with the error
1034                                  */
1035                                 invalid = true;
1036                         } else if (body_size > (full_size - SMB2_HDR_BODY)) {
1037                                 /*
1038                                  * this is invalid, just return a zero
1039                                  * body and let the caller deal with the error
1040                                  */
1041                                 invalid = true;
1042                         }
1043                 }
1044
1045                 if (invalid) {
1046                         /* the caller should check this */
1047                         body_size = 0;
1048                 }
1049
1050                 if ((body_size % 2) != 0) {
1051                         body_size -= 1;
1052                 }
1053
1054                 dyn_size = full_size - (SMB2_HDR_BODY + body_size);
1055
1056                 state->missing -= (body_size - 2) + dyn_size;
1057
1058                 body = talloc_array(req->in.vector, uint8_t, body_size);
1059                 if (body == NULL) {
1060                         return -1;
1061                 }
1062
1063                 dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
1064                 if (dyn == NULL) {
1065                         return -1;
1066                 }
1067
1068                 req->in.vector[idx].iov_base    = (void *)body;
1069                 req->in.vector[idx].iov_len     = body_size;
1070                 req->in.vector[idx+1].iov_base  = (void *)dyn;
1071                 req->in.vector[idx+1].iov_len   = dyn_size;
1072
1073                 vector = talloc_array(mem_ctx, struct iovec, 2);
1074                 if (vector == NULL) {
1075                         return -1;
1076                 }
1077
1078                 /*
1079                  * the first 2 bytes of the body were already fetched
1080                  * together with the header
1081                  */
1082                 memcpy(body, hdr + SMB2_HDR_BODY, 2);
1083                 vector[0].iov_base = body + 2;
1084                 vector[0].iov_len = req->in.vector[idx].iov_len - 2;
1085
1086                 vector[1] = req->in.vector[idx+1];
1087
1088                 *_vector = vector;
1089                 *_count = 2;
1090                 return 0;
1091         }
1092
1093         /*
1094          * when we endup here, we're looking for a new SMB2 request
1095          * next. And we ask for its header and the first 2 bytes of
1096          * the body (like we did for the first SMB2 request).
1097          */
1098
1099         req->in.vector = talloc_realloc(req, req->in.vector,
1100                                         struct iovec,
1101                                         req->in.vector_count + 1);
1102         if (req->in.vector == NULL) {
1103                 return -1;
1104         }
1105         req->in.vector_count += 1;
1106
1107         /*
1108          * We assume it's a SMB2 request,
1109          * and we first get the header and the
1110          * first 2 bytes (the struct size) of the body
1111          */
1112         len = SMB2_HDR_BODY + 2;
1113
1114         if (len > state->missing) {
1115                 /* let the caller handle the error */
1116                 len = state->missing;
1117         }
1118
1119         state->missing -= len;
1120         state->asked_for_header = true;
1121
1122         buf = talloc_array(req->in.vector, uint8_t, len);
1123         if (buf == NULL) {
1124                 return -1;
1125         }
1126
1127         req->in.vector[idx].iov_base    = (void *)buf;
1128         req->in.vector[idx].iov_len     = len;
1129
1130         vector = talloc_array(mem_ctx, struct iovec, 1);
1131         if (vector == NULL) {
1132                 return -1;
1133         }
1134
1135         vector[0] = req->in.vector[idx];
1136
1137         *_vector = vector;
1138         *_count = 1;
1139         return 0;
1140 }
1141
1142 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
1143 {
1144         struct tevent_req *req =
1145                 tevent_req_callback_data(subreq,
1146                 struct tevent_req);
1147         int ret;
1148         int sys_errno;
1149         NTSTATUS status;
1150
1151         ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
1152         if (ret == -1) {
1153                 status = map_nt_error_from_unix(sys_errno);
1154                 tevent_req_nterror(req, status);
1155                 return;
1156         }
1157
1158         tevent_req_done(req);
1159 }
1160
1161 static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
1162                                             TALLOC_CTX *mem_ctx,
1163                                             struct smbd_smb2_request **_smb2_req)
1164 {
1165         struct smbd_smb2_request_read_state *state =
1166                 tevent_req_data(req,
1167                 struct smbd_smb2_request_read_state);
1168         NTSTATUS status;
1169
1170         if (tevent_req_is_nterror(req, &status)) {
1171                 tevent_req_received(req);
1172                 return status;
1173         }
1174
1175         talloc_steal(mem_ctx, state->smb2_req->mem_pool);
1176         *_smb2_req = state->smb2_req;
1177         tevent_req_received(req);
1178         return NT_STATUS_OK;
1179 }
1180
1181 static void smbd_smb2_request_incoming(struct tevent_req *subreq);
1182
1183 void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
1184                              const uint8_t *inbuf, size_t size)
1185 {
1186         NTSTATUS status;
1187         struct smbd_smb2_request *req;
1188         struct tevent_req *subreq;
1189
1190         DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
1191                  (unsigned int)size));
1192
1193         status = smbd_initialize_smb2(conn);
1194         if (!NT_STATUS_IS_OK(status)) {
1195                 smbd_server_connection_terminate(conn, nt_errstr(status));
1196                 return;
1197         }
1198
1199         status = smbd_smb2_request_create(conn, inbuf, size, &req);
1200         if (!NT_STATUS_IS_OK(status)) {
1201                 smbd_server_connection_terminate(conn, nt_errstr(status));
1202                 return;
1203         }
1204
1205         status = smbd_smb2_request_setup_out(req);
1206         if (!NT_STATUS_IS_OK(status)) {
1207                 smbd_server_connection_terminate(conn, nt_errstr(status));
1208                 return;
1209         }
1210
1211         status = smbd_smb2_request_dispatch(req);
1212         if (!NT_STATUS_IS_OK(status)) {
1213                 smbd_server_connection_terminate(conn, nt_errstr(status));
1214                 return;
1215         }
1216
1217         /* ask for the next request */
1218         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1219         if (subreq == NULL) {
1220                 smbd_server_connection_terminate(conn, "no memory for reading");
1221                 return;
1222         }
1223         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1224 }
1225
1226 static void smbd_smb2_request_incoming(struct tevent_req *subreq)
1227 {
1228         struct smbd_server_connection *conn = tevent_req_callback_data(subreq,
1229                                               struct smbd_server_connection);
1230         NTSTATUS status;
1231         struct smbd_smb2_request *req;
1232
1233         status = smbd_smb2_request_read_recv(subreq, conn, &req);
1234         TALLOC_FREE(subreq);
1235         if (!NT_STATUS_IS_OK(status)) {
1236                 smbd_server_connection_terminate(conn, nt_errstr(status));
1237                 return;
1238         }
1239
1240         if (req->in.nbt_hdr[0] != 0x00) {
1241                 DEBUG(1,("smbd_smb2_request_incoming: ignore NBT[0x%02X] msg\n",
1242                          req->in.nbt_hdr[0]));
1243                 talloc_free(req->mem_pool);
1244                 req = NULL;
1245                 goto next;
1246         }
1247
1248         req->current_idx = 1;
1249
1250         DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
1251                  req->current_idx, req->in.vector_count));
1252
1253         status = smbd_smb2_request_validate(req);
1254         if (!NT_STATUS_IS_OK(status)) {
1255                 smbd_server_connection_terminate(conn, nt_errstr(status));
1256                 return;
1257         }
1258
1259         status = smbd_smb2_request_setup_out(req);
1260         if (!NT_STATUS_IS_OK(status)) {
1261                 smbd_server_connection_terminate(conn, nt_errstr(status));
1262                 return;
1263         }
1264
1265         status = smbd_smb2_request_dispatch(req);
1266         if (!NT_STATUS_IS_OK(status)) {
1267                 smbd_server_connection_terminate(conn, nt_errstr(status));
1268                 return;
1269         }
1270
1271 next:
1272         /* ask for the next request (this constructs the main loop) */
1273         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1274         if (subreq == NULL) {
1275                 smbd_server_connection_terminate(conn, "no memory for reading");
1276                 return;
1277         }
1278         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1279 }