source3/smbd/process.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    process incoming packets - main loop
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Volker Lendecke 2005-2007
   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 "librpc/gen_ndr/netlogon.h"
  24 #include "librpc/gen_ndr/messaging.h"
  25 #include "../lib/async_req/async_sock.h"
  26 #include "ctdbd_conn.h"
  27
  28 extern bool global_machine_password_needs_changing;
  29
  30 static void construct_reply_common(struct smb_request *req, const char *inbuf,
  31                                    char *outbuf);
  32 static struct pending_message_list *get_deferred_open_message_smb(uint64_t mid);
  33
  34 static bool smbd_lock_socket_internal(struct smbd_server_connection *sconn)
  35 {
  36         bool ok;
  37
  38         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
  39                 return true;
  40         }
  41
  42         sconn->smb1.echo_handler.ref_count++;
  43
  44         if (sconn->smb1.echo_handler.ref_count > 1) {
  45                 return true;
  46         }
  47
  48         DEBUG(10,("pid[%d] wait for socket lock\n", (int)sys_getpid()));
  49
  50         ok = fcntl_lock(sconn->smb1.echo_handler.socket_lock_fd,
  51                         SMB_F_SETLKW, 0, 0, F_WRLCK);
  52         if (!ok) {
  53                 return false;
  54         }
  55
  56         DEBUG(10,("pid[%d] got for socket lock\n", (int)sys_getpid()));
  57
  58         return true;
  59 }
  60
  61 void smbd_lock_socket(struct smbd_server_connection *sconn)
  62 {
  63         if (!smbd_lock_socket_internal(sconn)) {
  64                 exit_server_cleanly("failed to lock socket");
  65         }
  66 }
  67
  68 static bool smbd_unlock_socket_internal(struct smbd_server_connection *sconn)
  69 {
  70         bool ok;
  71
  72         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
  73                 return true;
  74         }
  75
  76         sconn->smb1.echo_handler.ref_count--;
  77
  78         if (sconn->smb1.echo_handler.ref_count > 0) {
  79                 return true;
  80         }
  81
  82         ok = fcntl_lock(sconn->smb1.echo_handler.socket_lock_fd,
  83                         SMB_F_SETLKW, 0, 0, F_UNLCK);
  84         if (!ok) {
  85                 return false;
  86         }
  87
  88         DEBUG(10,("pid[%d] unlocked socket\n", (int)sys_getpid()));
  89
  90         return true;
  91 }
  92
  93 void smbd_unlock_socket(struct smbd_server_connection *sconn)
  94 {
  95         if (!smbd_unlock_socket_internal(sconn)) {
  96                 exit_server_cleanly("failed to unlock socket");
  97         }
  98 }
  99
 100 /* Accessor function for smb_read_error for smbd functions. */
 101
 102 /****************************************************************************
 103  Send an smb to a fd.
 104 ****************************************************************************/
 105
 106 bool srv_send_smb(struct smbd_server_connection *sconn, char *buffer,
 107                   bool do_signing, uint32_t seqnum,
 108                   bool do_encrypt,
 109                   struct smb_perfcount_data *pcd)
 110 {
 111         size_t len = 0;
 112         size_t nwritten=0;
 113         ssize_t ret;
 114         char *buf_out = buffer;
 115
 116         smbd_lock_socket(sconn);
 117
 118         if (do_signing) {
 119                 /* Sign the outgoing packet if required. */
 120                 srv_calculate_sign_mac(sconn, buf_out, seqnum);
 121         }
 122
 123         if (do_encrypt) {
 124                 NTSTATUS status = srv_encrypt_buffer(buffer, &buf_out);
 125                 if (!NT_STATUS_IS_OK(status)) {
 126                         DEBUG(0, ("send_smb: SMB encryption failed "
 127                                 "on outgoing packet! Error %s\n",
 128                                 nt_errstr(status) ));
 129                         goto out;
 130                 }
 131         }
 132
 133         len = smb_len(buf_out) + 4;
 134
 135         ret = write_data(sconn->sock, buf_out+nwritten, len - nwritten);
 136         if (ret <= 0) {
 137
 138                 char addr[INET6_ADDRSTRLEN];
 139                 /*
 140                  * Try and give an error message saying what
 141                  * client failed.
 142                  */
 143                 DEBUG(0,("pid[%d] Error writing %d bytes to client %s. %d. (%s)\n",
 144                          (int)sys_getpid(), (int)len,
 145                          get_peer_addr(sconn->sock, addr, sizeof(addr)),
 146                          (int)ret, strerror(errno) ));
 147
 148                 srv_free_enc_buffer(buf_out);
 149                 goto out;
 150         }
 151
 152         SMB_PERFCOUNT_SET_MSGLEN_OUT(pcd, len);
 153         srv_free_enc_buffer(buf_out);
 154 out:
 155         SMB_PERFCOUNT_END(pcd);
 156
 157         smbd_unlock_socket(sconn);
 158         return true;
 159 }
 160
 161 /*******************************************************************
 162  Setup the word count and byte count for a smb message.
 163 ********************************************************************/
 164
 165 int srv_set_message(char *buf,
 166                         int num_words,
 167                         int num_bytes,
 168                         bool zero)
 169 {
 170         if (zero && (num_words || num_bytes)) {
 171                 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
 172         }
 173         SCVAL(buf,smb_wct,num_words);
 174         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
 175         smb_setlen(buf,(smb_size + num_words*2 + num_bytes - 4));
 176         return (smb_size + num_words*2 + num_bytes);
 177 }
 178
 179 static bool valid_smb_header(const uint8_t *inbuf)
 180 {
 181         if (is_encrypted_packet(inbuf)) {
 182                 return true;
 183         }
 184         /*
 185          * This used to be (strncmp(smb_base(inbuf),"\377SMB",4) == 0)
 186          * but it just looks weird to call strncmp for this one.
 187          */
 188         return (IVAL(smb_base(inbuf), 0) == 0x424D53FF);
 189 }
 190
 191 /* Socket functions for smbd packet processing. */
 192
 193 static bool valid_packet_size(size_t len)
 194 {
 195         /*
 196          * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
 197          * of header. Don't print the error if this fits.... JRA.
 198          */
 199
 200         if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
 201                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 202                                         (unsigned long)len));
 203                 return false;
 204         }
 205         return true;
 206 }
 207
 208 static NTSTATUS read_packet_remainder(int fd, char *buffer,
 209                                       unsigned int timeout, ssize_t len)
 210 {
 211         NTSTATUS status;
 212
 213         if (len <= 0) {
 214                 return NT_STATUS_OK;
 215         }
 216
 217         status = read_fd_with_timeout(fd, buffer, len, len, timeout, NULL);
 218         if (!NT_STATUS_IS_OK(status)) {
 219                 char addr[INET6_ADDRSTRLEN];
 220                 DEBUG(0, ("read_fd_with_timeout failed for client %s read "
 221                           "error = %s.\n",
 222                           get_peer_addr(fd, addr, sizeof(addr)),
 223                           nt_errstr(status)));
 224         }
 225         return status;
 226 }
 227
 228 /****************************************************************************
 229  Attempt a zerocopy writeX read. We know here that len > smb_size-4
 230 ****************************************************************************/
 231
 232 /*
 233  * Unfortunately, earlier versions of smbclient/libsmbclient
 234  * don't send this "standard" writeX header. I've fixed this
 235  * for 3.2 but we'll use the old method with earlier versions.
 236  * Windows and CIFSFS at least use this standard size. Not
 237  * sure about MacOSX.
 238  */
 239
 240 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
 241                                 (2*14) + /* word count (including bcc) */ \
 242                                 1 /* pad byte */)
 243
 244 static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
 245                                                     const char lenbuf[4],
 246                                                     int fd, char **buffer,
 247                                                     unsigned int timeout,
 248                                                     size_t *p_unread,
 249                                                     size_t *len_ret)
 250 {
 251         /* Size of a WRITEX call (+4 byte len). */
 252         char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
 253         ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
 254         ssize_t toread;
 255         NTSTATUS status;
 256
 257         memcpy(writeX_header, lenbuf, 4);
 258
 259         status = read_fd_with_timeout(
 260                 fd, writeX_header + 4,
 261                 STANDARD_WRITE_AND_X_HEADER_SIZE,
 262                 STANDARD_WRITE_AND_X_HEADER_SIZE,
 263                 timeout, NULL);
 264
 265         if (!NT_STATUS_IS_OK(status)) {
 266                 char addr[INET6_ADDRSTRLEN];
 267                 DEBUG(0, ("read_fd_with_timeout failed for client %s read "
 268                           "error = %s.\n",
 269                           get_peer_addr(fd, addr, sizeof(addr)),
 270                           nt_errstr(status)));
 271                 return status;
 272         }
 273
 274         /*
 275          * Ok - now try and see if this is a possible
 276          * valid writeX call.
 277          */
 278
 279         if (is_valid_writeX_buffer(smbd_server_conn,
 280                                    (uint8_t *)writeX_header)) {
 281                 /*
 282                  * If the data offset is beyond what
 283                  * we've read, drain the extra bytes.
 284                  */
 285                 uint16_t doff = SVAL(writeX_header,smb_vwv11);
 286                 ssize_t newlen;
 287
 288                 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
 289                         size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
 290                         if (drain_socket(fd, drain) != drain) {
 291                                 smb_panic("receive_smb_raw_talloc_partial_read:"
 292                                         " failed to drain pending bytes");
 293                         }
 294                 } else {
 295                         doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
 296                 }
 297
 298                 /* Spoof down the length and null out the bcc. */
 299                 set_message_bcc(writeX_header, 0);
 300                 newlen = smb_len(writeX_header);
 301
 302                 /* Copy the header we've written. */
 303
 304                 *buffer = (char *)TALLOC_MEMDUP(mem_ctx,
 305                                 writeX_header,
 306                                 sizeof(writeX_header));
 307
 308                 if (*buffer == NULL) {
 309                         DEBUG(0, ("Could not allocate inbuf of length %d\n",
 310                                   (int)sizeof(writeX_header)));
 311                         return NT_STATUS_NO_MEMORY;
 312                 }
 313
 314                 /* Work out the remaining bytes. */
 315                 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
 316                 *len_ret = newlen + 4;
 317                 return NT_STATUS_OK;
 318         }
 319
 320         if (!valid_packet_size(len)) {
 321                 return NT_STATUS_INVALID_PARAMETER;
 322         }
 323
 324         /*
 325          * Not a valid writeX call. Just do the standard
 326          * talloc and return.
 327          */
 328
 329         *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
 330
 331         if (*buffer == NULL) {
 332                 DEBUG(0, ("Could not allocate inbuf of length %d\n",
 333                           (int)len+4));
 334                 return NT_STATUS_NO_MEMORY;
 335         }
 336
 337         /* Copy in what we already read. */
 338         memcpy(*buffer,
 339                 writeX_header,
 340                 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
 341         toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
 342
 343         if(toread > 0) {
 344                 status = read_packet_remainder(
 345                         fd, (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
 346                         timeout, toread);
 347
 348                 if (!NT_STATUS_IS_OK(status)) {
 349                         DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
 350                                    nt_errstr(status)));
 351                         return status;
 352                 }
 353         }
 354
 355         *len_ret = len + 4;
 356         return NT_STATUS_OK;
 357 }
 358
 359 static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx, int fd,
 360                                        char **buffer, unsigned int timeout,
 361                                        size_t *p_unread, size_t *plen)
 362 {
 363         char lenbuf[4];
 364         size_t len;
 365         int min_recv_size = lp_min_receive_file_size();
 366         NTSTATUS status;
 367
 368         *p_unread = 0;
 369
 370         status = read_smb_length_return_keepalive(fd, lenbuf, timeout, &len);
 371         if (!NT_STATUS_IS_OK(status)) {
 372                 return status;
 373         }
 374
 375         if (CVAL(lenbuf,0) == 0 && min_recv_size &&
 376             (smb_len_large(lenbuf) > /* Could be a UNIX large writeX. */
 377                 (min_recv_size + STANDARD_WRITE_AND_X_HEADER_SIZE)) &&
 378             !srv_is_signing_active(smbd_server_conn) &&
 379             smbd_server_conn->smb1.echo_handler.trusted_fde == NULL) {
 380
 381                 return receive_smb_raw_talloc_partial_read(
 382                         mem_ctx, lenbuf, fd, buffer, timeout, p_unread, plen);
 383         }
 384
 385         if (!valid_packet_size(len)) {
 386                 return NT_STATUS_INVALID_PARAMETER;
 387         }
 388
 389         /*
 390          * The +4 here can't wrap, we've checked the length above already.
 391          */
 392
 393         *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
 394
 395         if (*buffer == NULL) {
 396                 DEBUG(0, ("Could not allocate inbuf of length %d\n",
 397                           (int)len+4));
 398                 return NT_STATUS_NO_MEMORY;
 399         }
 400
 401         memcpy(*buffer, lenbuf, sizeof(lenbuf));
 402
 403         status = read_packet_remainder(fd, (*buffer)+4, timeout, len);
 404         if (!NT_STATUS_IS_OK(status)) {
 405                 return status;
 406         }
 407
 408         *plen = len + 4;
 409         return NT_STATUS_OK;
 410 }
 411
 412 static NTSTATUS receive_smb_talloc(TALLOC_CTX *mem_ctx, int fd,
 413                                    char **buffer, unsigned int timeout,
 414                                    size_t *p_unread, bool *p_encrypted,
 415                                    size_t *p_len,
 416                                    uint32_t *seqnum,
 417                                    bool trusted_channel)
 418 {
 419         size_t len = 0;
 420         NTSTATUS status;
 421
 422         *p_encrypted = false;
 423
 424         status = receive_smb_raw_talloc(mem_ctx, fd, buffer, timeout,
 425                                         p_unread, &len);
 426         if (!NT_STATUS_IS_OK(status)) {
 427                 char addr[INET6_ADDRSTRLEN];
 428                 DEBUG(0, ("read_smb_length_return_keepalive failed for "
 429                           "client %s read error = %s.\n",
 430                           get_peer_addr(fd, addr, sizeof(addr)),
 431                           nt_errstr(status)));
 432                 return status;
 433         }
 434
 435         if (is_encrypted_packet((uint8_t *)*buffer)) {
 436                 status = srv_decrypt_buffer(*buffer);
 437                 if (!NT_STATUS_IS_OK(status)) {
 438                         DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
 439                                 "incoming packet! Error %s\n",
 440                                 nt_errstr(status) ));
 441                         return status;
 442                 }
 443                 *p_encrypted = true;
 444         }
 445
 446         /* Check the incoming SMB signature. */
 447         if (!srv_check_sign_mac(smbd_server_conn, *buffer, seqnum, trusted_channel)) {
 448                 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
 449                           "incoming packet!\n"));
 450                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 451         }
 452
 453         *p_len = len;
 454         return NT_STATUS_OK;
 455 }
 456
 457 /*
 458  * Initialize a struct smb_request from an inbuf
 459  */
 460
 461 static bool init_smb_request(struct smb_request *req,
 462                              struct smbd_server_connection *sconn,
 463                              const uint8 *inbuf,
 464                              size_t unread_bytes, bool encrypted,
 465                              uint32_t seqnum)
 466 {
 467         size_t req_size = smb_len(inbuf) + 4;
 468         /* Ensure we have at least smb_size bytes. */
 469         if (req_size < smb_size) {
 470                 DEBUG(0,("init_smb_request: invalid request size %u\n",
 471                         (unsigned int)req_size ));
 472                 return false;
 473         }
 474         req->cmd    = CVAL(inbuf, smb_com);
 475         req->flags2 = SVAL(inbuf, smb_flg2);
 476         req->smbpid = SVAL(inbuf, smb_pid);
 477         req->mid    = (uint64_t)SVAL(inbuf, smb_mid);
 478         req->seqnum = seqnum;
 479         req->vuid   = SVAL(inbuf, smb_uid);
 480         req->tid    = SVAL(inbuf, smb_tid);
 481         req->wct    = CVAL(inbuf, smb_wct);
 482         req->vwv    = (uint16_t *)(inbuf+smb_vwv);
 483         req->buflen = smb_buflen(inbuf);
 484         req->buf    = (const uint8_t *)smb_buf(inbuf);
 485         req->unread_bytes = unread_bytes;
 486         req->encrypted = encrypted;
 487         req->sconn = sconn;
 488         req->conn = conn_find(sconn,req->tid);
 489         req->chain_fsp = NULL;
 490         req->chain_outbuf = NULL;
 491         req->done = false;
 492         req->smb2req = NULL;
 493         smb_init_perfcount_data(&req->pcd);
 494
 495         /* Ensure we have at least wct words and 2 bytes of bcc. */
 496         if (smb_size + req->wct*2 > req_size) {
 497                 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
 498                         (unsigned int)req->wct,
 499                         (unsigned int)req_size));
 500                 return false;
 501         }
 502         /* Ensure bcc is correct. */
 503         if (((uint8 *)smb_buf(inbuf)) + req->buflen > inbuf + req_size) {
 504                 DEBUG(0,("init_smb_request: invalid bcc number %u "
 505                         "(wct = %u, size %u)\n",
 506                         (unsigned int)req->buflen,
 507                         (unsigned int)req->wct,
 508                         (unsigned int)req_size));
 509                 return false;
 510         }
 511
 512         req->outbuf = NULL;
 513         return true;
 514 }
 515
 516 static void process_smb(struct smbd_server_connection *conn,
 517                         uint8_t *inbuf, size_t nread, size_t unread_bytes,
 518                         uint32_t seqnum, bool encrypted,
 519                         struct smb_perfcount_data *deferred_pcd);
 520
 521 static void smbd_deferred_open_timer(struct event_context *ev,
 522                                      struct timed_event *te,
 523                                      struct timeval _tval,
 524                                      void *private_data)
 525 {
 526         struct pending_message_list *msg = talloc_get_type(private_data,
 527                                            struct pending_message_list);
 528         TALLOC_CTX *mem_ctx = talloc_tos();
 529         uint64_t mid = (uint64_t)SVAL(msg->buf.data,smb_mid);
 530         uint8_t *inbuf;
 531
 532         inbuf = (uint8_t *)talloc_memdup(mem_ctx, msg->buf.data,
 533                                          msg->buf.length);
 534         if (inbuf == NULL) {
 535                 exit_server("smbd_deferred_open_timer: talloc failed\n");
 536                 return;
 537         }
 538
 539         /* We leave this message on the queue so the open code can
 540            know this is a retry. */
 541         DEBUG(5,("smbd_deferred_open_timer: trigger mid %llu.\n",
 542                 (unsigned long long)mid ));
 543
 544         /* Mark the message as processed so this is not
 545          * re-processed in error. */
 546         msg->processed = true;
 547
 548         process_smb(smbd_server_conn, inbuf,
 549                     msg->buf.length, 0,
 550                     msg->seqnum, msg->encrypted, &msg->pcd);
 551
 552         /* If it's still there and was processed, remove it. */
 553         msg = get_deferred_open_message_smb(mid);
 554         if (msg && msg->processed) {
 555                 remove_deferred_open_message_smb(mid);
 556         }
 557 }
 558
 559 /****************************************************************************
 560  Function to push a message onto the tail of a linked list of smb messages ready
 561  for processing.
 562 ****************************************************************************/
 563
 564 static bool push_queued_message(struct smb_request *req,
 565                                 struct timeval request_time,
 566                                 struct timeval end_time,
 567                                 char *private_data, size_t private_len)
 568 {
 569         int msg_len = smb_len(req->inbuf) + 4;
 570         struct pending_message_list *msg;
 571
 572         msg = TALLOC_ZERO_P(NULL, struct pending_message_list);
 573
 574         if(msg == NULL) {
 575                 DEBUG(0,("push_message: malloc fail (1)\n"));
 576                 return False;
 577         }
 578
 579         msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
 580         if(msg->buf.data == NULL) {
 581                 DEBUG(0,("push_message: malloc fail (2)\n"));
 582                 TALLOC_FREE(msg);
 583                 return False;
 584         }
 585
 586         msg->request_time = request_time;
 587         msg->seqnum = req->seqnum;
 588         msg->encrypted = req->encrypted;
 589         msg->processed = false;
 590         SMB_PERFCOUNT_DEFER_OP(&req->pcd, &msg->pcd);
 591
 592         if (private_data) {
 593                 msg->private_data = data_blob_talloc(msg, private_data,
 594                                                      private_len);
 595                 if (msg->private_data.data == NULL) {
 596                         DEBUG(0,("push_message: malloc fail (3)\n"));
 597                         TALLOC_FREE(msg);
 598                         return False;
 599                 }
 600         }
 601
 602         msg->te = event_add_timed(smbd_event_context(),
 603                                   msg,
 604                                   end_time,
 605                                   smbd_deferred_open_timer,
 606                                   msg);
 607         if (!msg->te) {
 608                 DEBUG(0,("push_message: event_add_timed failed\n"));
 609                 TALLOC_FREE(msg);
 610                 return false;
 611         }
 612
 613         DLIST_ADD_END(deferred_open_queue, msg, struct pending_message_list *);
 614
 615         DEBUG(10,("push_message: pushed message length %u on "
 616                   "deferred_open_queue\n", (unsigned int)msg_len));
 617
 618         return True;
 619 }
 620
 621 /****************************************************************************
 622  Function to delete a sharing violation open message by mid.
 623 ****************************************************************************/
 624
 625 void remove_deferred_open_message_smb(uint64_t mid)
 626 {
 627         struct pending_message_list *pml;
 628
 629         if (smbd_server_conn->using_smb2) {
 630                 remove_deferred_open_message_smb2(smbd_server_conn, mid);
 631                 return;
 632         }
 633
 634         for (pml = deferred_open_queue; pml; pml = pml->next) {
 635                 if (mid == (uint64_t)SVAL(pml->buf.data,smb_mid)) {
 636                         DEBUG(10,("remove_deferred_open_message_smb: "
 637                                   "deleting mid %llu len %u\n",
 638                                   (unsigned long long)mid,
 639                                   (unsigned int)pml->buf.length ));
 640                         DLIST_REMOVE(deferred_open_queue, pml);
 641                         TALLOC_FREE(pml);
 642                         return;
 643                 }
 644         }
 645 }
 646
 647 /****************************************************************************
 648  Move a sharing violation open retry message to the front of the list and
 649  schedule it for immediate processing.
 650 ****************************************************************************/
 651
 652 void schedule_deferred_open_message_smb(uint64_t mid)
 653 {
 654         struct pending_message_list *pml;
 655         int i = 0;
 656
 657         if (smbd_server_conn->using_smb2) {
 658                 schedule_deferred_open_message_smb2(smbd_server_conn, mid);
 659                 return;
 660         }
 661
 662         for (pml = deferred_open_queue; pml; pml = pml->next) {
 663                 uint64_t msg_mid = (uint64_t)SVAL(pml->buf.data,smb_mid);
 664
 665                 DEBUG(10,("schedule_deferred_open_message_smb: [%d] "
 666                         "msg_mid = %llu\n",
 667                         i++,
 668                         (unsigned long long)msg_mid ));
 669
 670                 if (mid == msg_mid) {
 671                         struct timed_event *te;
 672
 673                         if (pml->processed) {
 674                                 /* A processed message should not be
 675                                  * rescheduled. */
 676                                 DEBUG(0,("schedule_deferred_open_message_smb: LOGIC ERROR "
 677                                         "message mid %llu was already processed\n",
 678                                         (unsigned long long)msg_mid ));
 679                                 continue;
 680                         }
 681
 682                         DEBUG(10,("schedule_deferred_open_message_smb: "
 683                                 "scheduling mid %llu\n",
 684                                 (unsigned long long)mid ));
 685
 686                         te = event_add_timed(smbd_event_context(),
 687                                              pml,
 688                                              timeval_zero(),
 689                                              smbd_deferred_open_timer,
 690                                              pml);
 691                         if (!te) {
 692                                 DEBUG(10,("schedule_deferred_open_message_smb: "
 693                                         "event_add_timed() failed, "
 694                                         "skipping mid %llu\n",
 695                                         (unsigned long long)msg_mid ));
 696                         }
 697
 698                         TALLOC_FREE(pml->te);
 699                         pml->te = te;
 700                         DLIST_PROMOTE(deferred_open_queue, pml);
 701                         return;
 702                 }
 703         }
 704
 705         DEBUG(10,("schedule_deferred_open_message_smb: failed to "
 706                 "find message mid %llu\n",
 707                 (unsigned long long)mid ));
 708 }
 709
 710 /****************************************************************************
 711  Return true if this mid is on the deferred queue and was not yet processed.
 712 ****************************************************************************/
 713
 714 bool open_was_deferred(uint64_t mid)
 715 {
 716         struct pending_message_list *pml;
 717
 718         if (smbd_server_conn->using_smb2) {
 719                 return open_was_deferred_smb2(smbd_server_conn, mid);
 720         }
 721
 722         for (pml = deferred_open_queue; pml; pml = pml->next) {
 723                 if (((uint64_t)SVAL(pml->buf.data,smb_mid)) == mid && !pml->processed) {
 724                         return True;
 725                 }
 726         }
 727         return False;
 728 }
 729
 730 /****************************************************************************
 731  Return the message queued by this mid.
 732 ****************************************************************************/
 733
 734 static struct pending_message_list *get_deferred_open_message_smb(uint64_t mid)
 735 {
 736         struct pending_message_list *pml;
 737
 738         for (pml = deferred_open_queue; pml; pml = pml->next) {
 739                 if (((uint64_t)SVAL(pml->buf.data,smb_mid)) == mid) {
 740                         return pml;
 741                 }
 742         }
 743         return NULL;
 744 }
 745
 746 /****************************************************************************
 747  Get the state data queued by this mid.
 748 ****************************************************************************/
 749
 750 bool get_deferred_open_message_state(struct smb_request *smbreq,
 751                                 struct timeval *p_request_time,
 752                                 void **pp_state)
 753 {
 754         struct pending_message_list *pml;
 755
 756         if (smbd_server_conn->using_smb2) {
 757                 return get_deferred_open_message_state_smb2(smbreq->smb2req,
 758                                         p_request_time,
 759                                         pp_state);
 760         }
 761
 762         pml = get_deferred_open_message_smb(smbreq->mid);
 763         if (!pml) {
 764                 return false;
 765         }
 766         if (p_request_time) {
 767                 *p_request_time = pml->request_time;
 768         }
 769         if (pp_state) {
 770                 *pp_state = (void *)pml->private_data.data;
 771         }
 772         return true;
 773 }
 774
 775 /****************************************************************************
 776  Function to push a deferred open smb message onto a linked list of local smb
 777  messages ready for processing.
 778 ****************************************************************************/
 779
 780 bool push_deferred_open_message_smb(struct smb_request *req,
 781                                struct timeval request_time,
 782                                struct timeval timeout,
 783                                struct file_id id,
 784                                char *private_data, size_t priv_len)
 785 {
 786         struct timeval end_time;
 787
 788         if (req->smb2req) {
 789                 return push_deferred_open_message_smb2(req->smb2req,
 790                                                 request_time,
 791                                                 timeout,
 792                                                 id,
 793                                                 private_data,
 794                                                 priv_len);
 795         }
 796
 797         if (req->unread_bytes) {
 798                 DEBUG(0,("push_deferred_open_message_smb: logic error ! "
 799                         "unread_bytes = %u\n",
 800                         (unsigned int)req->unread_bytes ));
 801                 smb_panic("push_deferred_open_message_smb: "
 802                         "logic error unread_bytes != 0" );
 803         }
 804
 805         end_time = timeval_sum(&request_time, &timeout);
 806
 807         DEBUG(10,("push_deferred_open_message_smb: pushing message "
 808                 "len %u mid %llu timeout time [%u.%06u]\n",
 809                 (unsigned int) smb_len(req->inbuf)+4,
 810                 (unsigned long long)req->mid,
 811                 (unsigned int)end_time.tv_sec,
 812                 (unsigned int)end_time.tv_usec));
 813
 814         return push_queued_message(req, request_time, end_time,
 815                                    private_data, priv_len);
 816 }
 817
 818 struct idle_event {
 819         struct timed_event *te;
 820         struct timeval interval;
 821         char *name;
 822         bool (*handler)(const struct timeval *now, void *private_data);
 823         void *private_data;
 824 };
 825
 826 static void smbd_idle_event_handler(struct event_context *ctx,
 827                                     struct timed_event *te,
 828                                     struct timeval now,
 829                                     void *private_data)
 830 {
 831         struct idle_event *event =
 832                 talloc_get_type_abort(private_data, struct idle_event);
 833
 834         TALLOC_FREE(event->te);
 835
 836         DEBUG(10,("smbd_idle_event_handler: %s %p called\n",
 837                   event->name, event->te));
 838
 839         if (!event->handler(&now, event->private_data)) {
 840                 DEBUG(10,("smbd_idle_event_handler: %s %p stopped\n",
 841                           event->name, event->te));
 842                 /* Don't repeat, delete ourselves */
 843                 TALLOC_FREE(event);
 844                 return;
 845         }
 846
 847         DEBUG(10,("smbd_idle_event_handler: %s %p rescheduled\n",
 848                   event->name, event->te));
 849
 850         event->te = event_add_timed(ctx, event,
 851                                     timeval_sum(&now, &event->interval),
 852                                     smbd_idle_event_handler, event);
 853
 854         /* We can't do much but fail here. */
 855         SMB_ASSERT(event->te != NULL);
 856 }
 857
 858 struct idle_event *event_add_idle(struct event_context *event_ctx,
 859                                   TALLOC_CTX *mem_ctx,
 860                                   struct timeval interval,
 861                                   const char *name,
 862                                   bool (*handler)(const struct timeval *now,
 863                                                   void *private_data),
 864                                   void *private_data)
 865 {
 866         struct idle_event *result;
 867         struct timeval now = timeval_current();
 868
 869         result = TALLOC_P(mem_ctx, struct idle_event);
 870         if (result == NULL) {
 871                 DEBUG(0, ("talloc failed\n"));
 872                 return NULL;
 873         }
 874
 875         result->interval = interval;
 876         result->handler = handler;
 877         result->private_data = private_data;
 878
 879         if (!(result->name = talloc_asprintf(result, "idle_evt(%s)", name))) {
 880                 DEBUG(0, ("talloc failed\n"));
 881                 TALLOC_FREE(result);
 882                 return NULL;
 883         }
 884
 885         result->te = event_add_timed(event_ctx, result,
 886                                      timeval_sum(&now, &interval),
 887                                      smbd_idle_event_handler, result);
 888         if (result->te == NULL) {
 889                 DEBUG(0, ("event_add_timed failed\n"));
 890                 TALLOC_FREE(result);
 891                 return NULL;
 892         }
 893
 894         DEBUG(10,("event_add_idle: %s %p\n", result->name, result->te));
 895         return result;
 896 }
 897
 898 static void smbd_sig_term_handler(struct tevent_context *ev,
 899                                   struct tevent_signal *se,
 900                                   int signum,
 901                                   int count,
 902                                   void *siginfo,
 903                                   void *private_data)
 904 {
 905         exit_server_cleanly("termination signal");
 906 }
 907
 908 void smbd_setup_sig_term_handler(void)
 909 {
 910         struct tevent_signal *se;
 911
 912         se = tevent_add_signal(smbd_event_context(),
 913                                smbd_event_context(),
 914                                SIGTERM, 0,
 915                                smbd_sig_term_handler,
 916                                NULL);
 917         if (!se) {
 918                 exit_server("failed to setup SIGTERM handler");
 919         }
 920 }
 921
 922 static void smbd_sig_hup_handler(struct tevent_context *ev,
 923                                   struct tevent_signal *se,
 924                                   int signum,
 925                                   int count,
 926                                   void *siginfo,
 927                                   void *private_data)
 928 {
 929         struct messaging_context *msg_ctx = talloc_get_type_abort(
 930                 private_data, struct messaging_context);
 931         change_to_root_user();
 932         DEBUG(1,("Reloading services after SIGHUP\n"));
 933         reload_services(msg_ctx, smbd_server_conn->sock, False);
 934 }
 935
 936 void smbd_setup_sig_hup_handler(struct tevent_context *ev,
 937                                 struct messaging_context *msg_ctx)
 938 {
 939         struct tevent_signal *se;
 940
 941         se = tevent_add_signal(ev, ev, SIGHUP, 0, smbd_sig_hup_handler,
 942                                msg_ctx);
 943         if (!se) {
 944                 exit_server("failed to setup SIGHUP handler");
 945         }
 946 }
 947
 948 static NTSTATUS smbd_server_connection_loop_once(struct smbd_server_connection *conn)
 949 {
 950         fd_set r_fds, w_fds;
 951         int selrtn;
 952         struct timeval to;
 953         int maxfd = 0;
 954
 955         to.tv_sec = SMBD_SELECT_TIMEOUT;
 956         to.tv_usec = 0;
 957
 958         /*
 959          * Setup the select fd sets.
 960          */
 961
 962         FD_ZERO(&r_fds);
 963         FD_ZERO(&w_fds);
 964
 965         /*
 966          * Are there any timed events waiting ? If so, ensure we don't
 967          * select for longer than it would take to wait for them.
 968          */
 969
 970         {
 971                 struct timeval now;
 972                 GetTimeOfDay(&now);
 973
 974                 event_add_to_select_args(smbd_event_context(), &now,
 975                                          &r_fds, &w_fds, &to, &maxfd);
 976         }
 977
 978         /* Process a signal and timed events now... */
 979         if (run_events(smbd_event_context(), 0, NULL, NULL)) {
 980                 return NT_STATUS_RETRY;
 981         }
 982
 983         {
 984                 int sav;
 985                 START_PROFILE(smbd_idle);
 986
 987                 selrtn = sys_select(maxfd+1,&r_fds,&w_fds,NULL,&to);
 988                 sav = errno;
 989
 990                 END_PROFILE(smbd_idle);
 991                 errno = sav;
 992         }
 993
 994         if ((conn->smb1.echo_handler.trusted_fd != -1)
 995             && FD_ISSET(conn->sock, &r_fds)
 996             && FD_ISSET(conn->smb1.echo_handler.trusted_fd, &r_fds)) {
 997                 /*
 998                  * Prefer to read pending requests from the echo handler. To
 999                  * quote Jeremy (da70f8ab1): This is a hack of monstrous
1000                  * proportions...
1001                  */
1002                 FD_CLR(conn->sock, &r_fds);
1003         }
1004
1005         if (run_events(smbd_event_context(), selrtn, &r_fds, &w_fds)) {
1006                 return NT_STATUS_RETRY;
1007         }
1008
1009         /* Check if error */
1010         if (selrtn == -1) {
1011                 /* something is wrong. Maybe the socket is dead? */
1012                 return map_nt_error_from_unix(errno);
1013         }
1014
1015         /* Did we timeout ? */
1016         if (selrtn == 0) {
1017                 return NT_STATUS_RETRY;
1018         }
1019
1020         /* should not be reached */
1021         return NT_STATUS_INTERNAL_ERROR;
1022 }
1023
1024 /*
1025  * Only allow 5 outstanding trans requests. We're allocating memory, so
1026  * prevent a DoS.
1027  */
1028
1029 NTSTATUS allow_new_trans(struct trans_state *list, uint64_t mid)
1030 {
1031         int count = 0;
1032         for (; list != NULL; list = list->next) {
1033
1034                 if (list->mid == mid) {
1035                         return NT_STATUS_INVALID_PARAMETER;
1036                 }
1037
1038                 count += 1;
1039         }
1040         if (count > 5) {
1041                 return NT_STATUS_INSUFFICIENT_RESOURCES;
1042         }
1043
1044         return NT_STATUS_OK;
1045 }
1046
1047 /*
1048 These flags determine some of the permissions required to do an operation
1049
1050 Note that I don't set NEED_WRITE on some write operations because they
1051 are used by some brain-dead clients when printing, and I don't want to
1052 force write permissions on print services.
1053 */
1054 #define AS_USER (1<<0)
1055 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
1056 #define TIME_INIT (1<<2)
1057 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
1058 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
1059 #define DO_CHDIR (1<<6)
1060
1061 /*
1062    define a list of possible SMB messages and their corresponding
1063    functions. Any message that has a NULL function is unimplemented -
1064    please feel free to contribute implementations!
1065 */
1066 static const struct smb_message_struct {
1067         const char *name;
1068         void (*fn)(struct smb_request *req);
1069         int flags;
1070 } smb_messages[256] = {
1071
1072 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
1073 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
1074 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
1075 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
1076 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
1077 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
1078 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
1079 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
1080 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
1081 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
1082 /* 0x0a */ { "SMBread",reply_read,AS_USER},
1083 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
1084 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
1085 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
1086 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
1087 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
1088 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
1089 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
1090 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
1091 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
1092 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
1093 /* 0x15 */ { NULL, NULL, 0 },
1094 /* 0x16 */ { NULL, NULL, 0 },
1095 /* 0x17 */ { NULL, NULL, 0 },
1096 /* 0x18 */ { NULL, NULL, 0 },
1097 /* 0x19 */ { NULL, NULL, 0 },
1098 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
1099 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
1100 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
1101 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
1102 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
1103 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
1104 /* 0x20 */ { "SMBwritec", NULL,0},
1105 /* 0x21 */ { NULL, NULL, 0 },
1106 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
1107 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
1108 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
1109 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
1110 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
1111 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
1112 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
1113 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
1114 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
1115 /* 0x2b */ { "SMBecho",reply_echo,0},
1116 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
1117 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
1118 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
1119 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
1120 /* 0x30 */ { NULL, NULL, 0 },
1121 /* 0x31 */ { NULL, NULL, 0 },
1122 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
1123 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER | CAN_IPC },
1124 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
1125 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
1126 /* 0x36 */ { NULL, NULL, 0 },
1127 /* 0x37 */ { NULL, NULL, 0 },
1128 /* 0x38 */ { NULL, NULL, 0 },
1129 /* 0x39 */ { NULL, NULL, 0 },
1130 /* 0x3a */ { NULL, NULL, 0 },
1131 /* 0x3b */ { NULL, NULL, 0 },
1132 /* 0x3c */ { NULL, NULL, 0 },
1133 /* 0x3d */ { NULL, NULL, 0 },
1134 /* 0x3e */ { NULL, NULL, 0 },
1135 /* 0x3f */ { NULL, NULL, 0 },
1136 /* 0x40 */ { NULL, NULL, 0 },
1137 /* 0x41 */ { NULL, NULL, 0 },
1138 /* 0x42 */ { NULL, NULL, 0 },
1139 /* 0x43 */ { NULL, NULL, 0 },
1140 /* 0x44 */ { NULL, NULL, 0 },
1141 /* 0x45 */ { NULL, NULL, 0 },
1142 /* 0x46 */ { NULL, NULL, 0 },
1143 /* 0x47 */ { NULL, NULL, 0 },
1144 /* 0x48 */ { NULL, NULL, 0 },
1145 /* 0x49 */ { NULL, NULL, 0 },
1146 /* 0x4a */ { NULL, NULL, 0 },
1147 /* 0x4b */ { NULL, NULL, 0 },
1148 /* 0x4c */ { NULL, NULL, 0 },
1149 /* 0x4d */ { NULL, NULL, 0 },
1150 /* 0x4e */ { NULL, NULL, 0 },
1151 /* 0x4f */ { NULL, NULL, 0 },
1152 /* 0x50 */ { NULL, NULL, 0 },
1153 /* 0x51 */ { NULL, NULL, 0 },
1154 /* 0x52 */ { NULL, NULL, 0 },
1155 /* 0x53 */ { NULL, NULL, 0 },
1156 /* 0x54 */ { NULL, NULL, 0 },
1157 /* 0x55 */ { NULL, NULL, 0 },
1158 /* 0x56 */ { NULL, NULL, 0 },
1159 /* 0x57 */ { NULL, NULL, 0 },
1160 /* 0x58 */ { NULL, NULL, 0 },
1161 /* 0x59 */ { NULL, NULL, 0 },
1162 /* 0x5a */ { NULL, NULL, 0 },
1163 /* 0x5b */ { NULL, NULL, 0 },
1164 /* 0x5c */ { NULL, NULL, 0 },
1165 /* 0x5d */ { NULL, NULL, 0 },
1166 /* 0x5e */ { NULL, NULL, 0 },
1167 /* 0x5f */ { NULL, NULL, 0 },
1168 /* 0x60 */ { NULL, NULL, 0 },
1169 /* 0x61 */ { NULL, NULL, 0 },
1170 /* 0x62 */ { NULL, NULL, 0 },
1171 /* 0x63 */ { NULL, NULL, 0 },
1172 /* 0x64 */ { NULL, NULL, 0 },
1173 /* 0x65 */ { NULL, NULL, 0 },
1174 /* 0x66 */ { NULL, NULL, 0 },
1175 /* 0x67 */ { NULL, NULL, 0 },
1176 /* 0x68 */ { NULL, NULL, 0 },
1177 /* 0x69 */ { NULL, NULL, 0 },
1178 /* 0x6a */ { NULL, NULL, 0 },
1179 /* 0x6b */ { NULL, NULL, 0 },
1180 /* 0x6c */ { NULL, NULL, 0 },
1181 /* 0x6d */ { NULL, NULL, 0 },
1182 /* 0x6e */ { NULL, NULL, 0 },
1183 /* 0x6f */ { NULL, NULL, 0 },
1184 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1185 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1186 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1187 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1188 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1189 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1190 /* 0x76 */ { NULL, NULL, 0 },
1191 /* 0x77 */ { NULL, NULL, 0 },
1192 /* 0x78 */ { NULL, NULL, 0 },
1193 /* 0x79 */ { NULL, NULL, 0 },
1194 /* 0x7a */ { NULL, NULL, 0 },
1195 /* 0x7b */ { NULL, NULL, 0 },
1196 /* 0x7c */ { NULL, NULL, 0 },
1197 /* 0x7d */ { NULL, NULL, 0 },
1198 /* 0x7e */ { NULL, NULL, 0 },
1199 /* 0x7f */ { NULL, NULL, 0 },
1200 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1201 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1202 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1203 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1204 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1205 /* 0x85 */ { NULL, NULL, 0 },
1206 /* 0x86 */ { NULL, NULL, 0 },
1207 /* 0x87 */ { NULL, NULL, 0 },
1208 /* 0x88 */ { NULL, NULL, 0 },
1209 /* 0x89 */ { NULL, NULL, 0 },
1210 /* 0x8a */ { NULL, NULL, 0 },
1211 /* 0x8b */ { NULL, NULL, 0 },
1212 /* 0x8c */ { NULL, NULL, 0 },
1213 /* 0x8d */ { NULL, NULL, 0 },
1214 /* 0x8e */ { NULL, NULL, 0 },
1215 /* 0x8f */ { NULL, NULL, 0 },
1216 /* 0x90 */ { NULL, NULL, 0 },
1217 /* 0x91 */ { NULL, NULL, 0 },
1218 /* 0x92 */ { NULL, NULL, 0 },
1219 /* 0x93 */ { NULL, NULL, 0 },
1220 /* 0x94 */ { NULL, NULL, 0 },
1221 /* 0x95 */ { NULL, NULL, 0 },
1222 /* 0x96 */ { NULL, NULL, 0 },
1223 /* 0x97 */ { NULL, NULL, 0 },
1224 /* 0x98 */ { NULL, NULL, 0 },
1225 /* 0x99 */ { NULL, NULL, 0 },
1226 /* 0x9a */ { NULL, NULL, 0 },
1227 /* 0x9b */ { NULL, NULL, 0 },
1228 /* 0x9c */ { NULL, NULL, 0 },
1229 /* 0x9d */ { NULL, NULL, 0 },
1230 /* 0x9e */ { NULL, NULL, 0 },
1231 /* 0x9f */ { NULL, NULL, 0 },
1232 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1233 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1234 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1235 /* 0xa3 */ { NULL, NULL, 0 },
1236 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1237 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1238 /* 0xa6 */ { NULL, NULL, 0 },
1239 /* 0xa7 */ { NULL, NULL, 0 },
1240 /* 0xa8 */ { NULL, NULL, 0 },
1241 /* 0xa9 */ { NULL, NULL, 0 },
1242 /* 0xaa */ { NULL, NULL, 0 },
1243 /* 0xab */ { NULL, NULL, 0 },
1244 /* 0xac */ { NULL, NULL, 0 },
1245 /* 0xad */ { NULL, NULL, 0 },
1246 /* 0xae */ { NULL, NULL, 0 },
1247 /* 0xaf */ { NULL, NULL, 0 },
1248 /* 0xb0 */ { NULL, NULL, 0 },
1249 /* 0xb1 */ { NULL, NULL, 0 },
1250 /* 0xb2 */ { NULL, NULL, 0 },
1251 /* 0xb3 */ { NULL, NULL, 0 },
1252 /* 0xb4 */ { NULL, NULL, 0 },
1253 /* 0xb5 */ { NULL, NULL, 0 },
1254 /* 0xb6 */ { NULL, NULL, 0 },
1255 /* 0xb7 */ { NULL, NULL, 0 },
1256 /* 0xb8 */ { NULL, NULL, 0 },
1257 /* 0xb9 */ { NULL, NULL, 0 },
1258 /* 0xba */ { NULL, NULL, 0 },
1259 /* 0xbb */ { NULL, NULL, 0 },
1260 /* 0xbc */ { NULL, NULL, 0 },
1261 /* 0xbd */ { NULL, NULL, 0 },
1262 /* 0xbe */ { NULL, NULL, 0 },
1263 /* 0xbf */ { NULL, NULL, 0 },
1264 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1265 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1266 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1267 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1268 /* 0xc4 */ { NULL, NULL, 0 },
1269 /* 0xc5 */ { NULL, NULL, 0 },
1270 /* 0xc6 */ { NULL, NULL, 0 },
1271 /* 0xc7 */ { NULL, NULL, 0 },
1272 /* 0xc8 */ { NULL, NULL, 0 },
1273 /* 0xc9 */ { NULL, NULL, 0 },
1274 /* 0xca */ { NULL, NULL, 0 },
1275 /* 0xcb */ { NULL, NULL, 0 },
1276 /* 0xcc */ { NULL, NULL, 0 },
1277 /* 0xcd */ { NULL, NULL, 0 },
1278 /* 0xce */ { NULL, NULL, 0 },
1279 /* 0xcf */ { NULL, NULL, 0 },
1280 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1281 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1282 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1283 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1284 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1285 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1286 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1287 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1288 /* 0xd8 */ { NULL, NULL, 0 },
1289 /* 0xd9 */ { NULL, NULL, 0 },
1290 /* 0xda */ { NULL, NULL, 0 },
1291 /* 0xdb */ { NULL, NULL, 0 },
1292 /* 0xdc */ { NULL, NULL, 0 },
1293 /* 0xdd */ { NULL, NULL, 0 },
1294 /* 0xde */ { NULL, NULL, 0 },
1295 /* 0xdf */ { NULL, NULL, 0 },
1296 /* 0xe0 */ { NULL, NULL, 0 },
1297 /* 0xe1 */ { NULL, NULL, 0 },
1298 /* 0xe2 */ { NULL, NULL, 0 },
1299 /* 0xe3 */ { NULL, NULL, 0 },
1300 /* 0xe4 */ { NULL, NULL, 0 },
1301 /* 0xe5 */ { NULL, NULL, 0 },
1302 /* 0xe6 */ { NULL, NULL, 0 },
1303 /* 0xe7 */ { NULL, NULL, 0 },
1304 /* 0xe8 */ { NULL, NULL, 0 },
1305 /* 0xe9 */ { NULL, NULL, 0 },
1306 /* 0xea */ { NULL, NULL, 0 },
1307 /* 0xeb */ { NULL, NULL, 0 },
1308 /* 0xec */ { NULL, NULL, 0 },
1309 /* 0xed */ { NULL, NULL, 0 },
1310 /* 0xee */ { NULL, NULL, 0 },
1311 /* 0xef */ { NULL, NULL, 0 },
1312 /* 0xf0 */ { NULL, NULL, 0 },
1313 /* 0xf1 */ { NULL, NULL, 0 },
1314 /* 0xf2 */ { NULL, NULL, 0 },
1315 /* 0xf3 */ { NULL, NULL, 0 },
1316 /* 0xf4 */ { NULL, NULL, 0 },
1317 /* 0xf5 */ { NULL, NULL, 0 },
1318 /* 0xf6 */ { NULL, NULL, 0 },
1319 /* 0xf7 */ { NULL, NULL, 0 },
1320 /* 0xf8 */ { NULL, NULL, 0 },
1321 /* 0xf9 */ { NULL, NULL, 0 },
1322 /* 0xfa */ { NULL, NULL, 0 },
1323 /* 0xfb */ { NULL, NULL, 0 },
1324 /* 0xfc */ { NULL, NULL, 0 },
1325 /* 0xfd */ { NULL, NULL, 0 },
1326 /* 0xfe */ { NULL, NULL, 0 },
1327 /* 0xff */ { NULL, NULL, 0 }
1328
1329 };
1330
1331 /*******************************************************************
1332  allocate and initialize a reply packet
1333 ********************************************************************/
1334
1335 static bool create_outbuf(TALLOC_CTX *mem_ctx, struct smb_request *req,
1336                           const char *inbuf, char **outbuf, uint8_t num_words,
1337                           uint32_t num_bytes)
1338 {
1339         /*
1340          * Protect against integer wrap
1341          */
1342         if ((num_bytes > 0xffffff)
1343             || ((num_bytes + smb_size + num_words*2) > 0xffffff)) {
1344                 char *msg;
1345                 if (asprintf(&msg, "num_bytes too large: %u",
1346                              (unsigned)num_bytes) == -1) {
1347                         msg = CONST_DISCARD(char *, "num_bytes too large");
1348                 }
1349                 smb_panic(msg);
1350         }
1351
1352         *outbuf = TALLOC_ARRAY(mem_ctx, char,
1353                                smb_size + num_words*2 + num_bytes);
1354         if (*outbuf == NULL) {
1355                 return false;
1356         }
1357
1358         construct_reply_common(req, inbuf, *outbuf);
1359         srv_set_message(*outbuf, num_words, num_bytes, false);
1360         /*
1361          * Zero out the word area, the caller has to take care of the bcc area
1362          * himself
1363          */
1364         if (num_words != 0) {
1365                 memset(*outbuf + smb_vwv0, 0, num_words*2);
1366         }
1367
1368         return true;
1369 }
1370
1371 void reply_outbuf(struct smb_request *req, uint8 num_words, uint32 num_bytes)
1372 {
1373         char *outbuf;
1374         if (!create_outbuf(req, req, (char *)req->inbuf, &outbuf, num_words,
1375                            num_bytes)) {
1376                 smb_panic("could not allocate output buffer\n");
1377         }
1378         req->outbuf = (uint8_t *)outbuf;
1379 }
1380
1381
1382 /*******************************************************************
1383  Dump a packet to a file.
1384 ********************************************************************/
1385
1386 static void smb_dump(const char *name, int type, const char *data, ssize_t len)
1387 {
1388         int fd, i;
1389         char *fname = NULL;
1390         if (DEBUGLEVEL < 50) {
1391                 return;
1392         }
1393
1394         if (len < 4) len = smb_len(data)+4;
1395         for (i=1;i<100;i++) {
1396                 if (asprintf(&fname, "/tmp/%s.%d.%s", name, i,
1397                              type ? "req" : "resp") == -1) {
1398                         return;
1399                 }
1400                 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1401                 if (fd != -1 || errno != EEXIST) break;
1402         }
1403         if (fd != -1) {
1404                 ssize_t ret = write(fd, data, len);
1405                 if (ret != len)
1406                         DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1407                 close(fd);
1408                 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1409         }
1410         SAFE_FREE(fname);
1411 }
1412
1413 /****************************************************************************
1414  Prepare everything for calling the actual request function, and potentially
1415  call the request function via the "new" interface.
1416
1417  Return False if the "legacy" function needs to be called, everything is
1418  prepared.
1419
1420  Return True if we're done.
1421
1422  I know this API sucks, but it is the one with the least code change I could
1423  find.
1424 ****************************************************************************/
1425
1426 static connection_struct *switch_message(uint8 type, struct smb_request *req, int size)
1427 {
1428         int flags;
1429         uint16 session_tag;
1430         connection_struct *conn = NULL;
1431         struct smbd_server_connection *sconn = req->sconn;
1432
1433         errno = 0;
1434
1435         /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1436          * so subtract 4 from it. */
1437         if (!valid_smb_header(req->inbuf)
1438             || (size < (smb_size - 4))) {
1439                 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1440                          smb_len(req->inbuf)));
1441                 exit_server_cleanly("Non-SMB packet");
1442         }
1443
1444         if (smb_messages[type].fn == NULL) {
1445                 DEBUG(0,("Unknown message type %d!\n",type));
1446                 smb_dump("Unknown", 1, (char *)req->inbuf, size);
1447                 reply_unknown_new(req, type);
1448                 return NULL;
1449         }
1450
1451         flags = smb_messages[type].flags;
1452
1453         /* In share mode security we must ignore the vuid. */
1454         session_tag = (lp_security() == SEC_SHARE)
1455                 ? UID_FIELD_INVALID : req->vuid;
1456         conn = req->conn;
1457
1458         DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1459                  (int)sys_getpid(), (unsigned long)conn));
1460
1461         smb_dump(smb_fn_name(type), 1, (char *)req->inbuf, size);
1462
1463         /* Ensure this value is replaced in the incoming packet. */
1464         SSVAL(req->inbuf,smb_uid,session_tag);
1465
1466         /*
1467          * Ensure the correct username is in current_user_info.  This is a
1468          * really ugly bugfix for problems with multiple session_setup_and_X's
1469          * being done and allowing %U and %G substitutions to work correctly.
1470          * There is a reason this code is done here, don't move it unless you
1471          * know what you're doing... :-).
1472          * JRA.
1473          */
1474
1475         if (session_tag != sconn->smb1.sessions.last_session_tag) {
1476                 user_struct *vuser = NULL;
1477
1478                 sconn->smb1.sessions.last_session_tag = session_tag;
1479                 if(session_tag != UID_FIELD_INVALID) {
1480                         vuser = get_valid_user_struct(sconn, session_tag);
1481                         if (vuser) {
1482                                 set_current_user_info(
1483                                         vuser->server_info->sanitized_username,
1484                                         vuser->server_info->unix_name,
1485                                         vuser->server_info->info3->base.domain.string);
1486                         }
1487                 }
1488         }
1489
1490         /* Does this call need to be run as the connected user? */
1491         if (flags & AS_USER) {
1492
1493                 /* Does this call need a valid tree connection? */
1494                 if (!conn) {
1495                         /*
1496                          * Amazingly, the error code depends on the command
1497                          * (from Samba4).
1498                          */
1499                         if (type == SMBntcreateX) {
1500                                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1501                         } else {
1502                                 reply_nterror(req, NT_STATUS_NETWORK_NAME_DELETED);
1503                         }
1504                         return NULL;
1505                 }
1506
1507                 if (!change_to_user(conn,session_tag)) {
1508                         DEBUG(0, ("Error: Could not change to user. Removing "
1509                                 "deferred open, mid=%llu.\n",
1510                                 (unsigned long long)req->mid));
1511                         reply_force_doserror(req, ERRSRV, ERRbaduid);
1512                         return conn;
1513                 }
1514
1515                 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1516
1517                 /* Does it need write permission? */
1518                 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1519                         reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1520                         return conn;
1521                 }
1522
1523                 /* IPC services are limited */
1524                 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1525                         reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1526                         return conn;
1527                 }
1528         } else {
1529                 /* This call needs to be run as root */
1530                 change_to_root_user();
1531         }
1532
1533         /* load service specific parameters */
1534         if (conn) {
1535                 if (req->encrypted) {
1536                         conn->encrypted_tid = true;
1537                         /* encrypted required from now on. */
1538                         conn->encrypt_level = Required;
1539                 } else if (ENCRYPTION_REQUIRED(conn)) {
1540                         if (req->cmd != SMBtrans2 && req->cmd != SMBtranss2) {
1541                                 exit_server_cleanly("encryption required "
1542                                         "on connection");
1543                                 return conn;
1544                         }
1545                 }
1546
1547                 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1548                                          (flags & (AS_USER|DO_CHDIR)
1549                                           ?True:False))) {
1550                         reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1551                         return conn;
1552                 }
1553                 conn->num_smb_operations++;
1554         }
1555
1556         /* does this protocol need to be run as guest? */
1557         if ((flags & AS_GUEST)
1558             && (!change_to_guest() ||
1559                 !allow_access(lp_hostsdeny(-1), lp_hostsallow(-1),
1560                               sconn->client_id.name,
1561                               sconn->client_id.addr))) {
1562                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1563                 return conn;
1564         }
1565
1566         smb_messages[type].fn(req);
1567         return req->conn;
1568 }
1569
1570 /****************************************************************************
1571  Construct a reply to the incoming packet.
1572 ****************************************************************************/
1573
1574 static void construct_reply(char *inbuf, int size, size_t unread_bytes,
1575                             uint32_t seqnum, bool encrypted,
1576                             struct smb_perfcount_data *deferred_pcd)
1577 {
1578         connection_struct *conn;
1579         struct smb_request *req;
1580
1581         if (!(req = talloc(talloc_tos(), struct smb_request))) {
1582                 smb_panic("could not allocate smb_request");
1583         }
1584
1585         if (!init_smb_request(req, smbd_server_conn, (uint8 *)inbuf,
1586                               unread_bytes, encrypted, seqnum)) {
1587                 exit_server_cleanly("Invalid SMB request");
1588         }
1589
1590         req->inbuf  = (uint8_t *)talloc_move(req, &inbuf);
1591
1592         /* we popped this message off the queue - keep original perf data */
1593         if (deferred_pcd)
1594                 req->pcd = *deferred_pcd;
1595         else {
1596                 SMB_PERFCOUNT_START(&req->pcd);
1597                 SMB_PERFCOUNT_SET_OP(&req->pcd, req->cmd);
1598                 SMB_PERFCOUNT_SET_MSGLEN_IN(&req->pcd, size);
1599         }
1600
1601         conn = switch_message(req->cmd, req, size);
1602
1603         if (req->unread_bytes) {
1604                 /* writeX failed. drain socket. */
1605                 if (drain_socket(req->sconn->sock, req->unread_bytes) !=
1606                                 req->unread_bytes) {
1607                         smb_panic("failed to drain pending bytes");
1608                 }
1609                 req->unread_bytes = 0;
1610         }
1611
1612         if (req->done) {
1613                 TALLOC_FREE(req);
1614                 return;
1615         }
1616
1617         if (req->outbuf == NULL) {
1618                 return;
1619         }
1620
1621         if (CVAL(req->outbuf,0) == 0) {
1622                 show_msg((char *)req->outbuf);
1623         }
1624
1625         if (!srv_send_smb(req->sconn,
1626                         (char *)req->outbuf,
1627                         true, req->seqnum+1,
1628                         IS_CONN_ENCRYPTED(conn)||req->encrypted,
1629                         &req->pcd)) {
1630                 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1631         }
1632
1633         TALLOC_FREE(req);
1634
1635         return;
1636 }
1637
1638 /****************************************************************************
1639  Process an smb from the client
1640 ****************************************************************************/
1641 static void process_smb(struct smbd_server_connection *conn,
1642                         uint8_t *inbuf, size_t nread, size_t unread_bytes,
1643                         uint32_t seqnum, bool encrypted,
1644                         struct smb_perfcount_data *deferred_pcd)
1645 {
1646         int msg_type = CVAL(inbuf,0);
1647
1648         DO_PROFILE_INC(smb_count);
1649
1650         DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1651                     smb_len(inbuf) ) );
1652         DEBUG(3, ("Transaction %d of length %d (%u toread)\n",
1653                   conn->trans_num, (int)nread, (unsigned int)unread_bytes));
1654
1655         if (msg_type != 0) {
1656                 /*
1657                  * NetBIOS session request, keepalive, etc.
1658                  */
1659                 reply_special(conn, (char *)inbuf, nread);
1660                 goto done;
1661         }
1662
1663         if (smbd_server_conn->using_smb2) {
1664                 /* At this point we're not really using smb2,
1665                  * we make the decision here.. */
1666                 if (smbd_is_smb2_header(inbuf, nread)) {
1667                         smbd_smb2_first_negprot(smbd_server_conn, inbuf, nread);
1668                         return;
1669                 } else if (nread >= smb_size && valid_smb_header(inbuf)
1670                                 && CVAL(inbuf, smb_com) != 0x72) {
1671                         /* This is a non-negprot SMB1 packet.
1672                            Disable SMB2 from now on. */
1673                         smbd_server_conn->using_smb2 = false;
1674                 }
1675         }
1676
1677         show_msg((char *)inbuf);
1678
1679         construct_reply((char *)inbuf,nread,unread_bytes,seqnum,encrypted,deferred_pcd);
1680         conn->trans_num++;
1681
1682 done:
1683         conn->smb1.num_requests++;
1684
1685         /* The timeout_processing function isn't run nearly
1686            often enough to implement 'max log size' without
1687            overrunning the size of the file by many megabytes.
1688            This is especially true if we are running at debug
1689            level 10.  Checking every 50 SMBs is a nice
1690            tradeoff of performance vs log file size overrun. */
1691
1692         if ((conn->smb1.num_requests % 50) == 0 &&
1693             need_to_check_log_size()) {
1694                 change_to_root_user();
1695                 check_log_size();
1696         }
1697 }
1698
1699 /****************************************************************************
1700  Return a string containing the function name of a SMB command.
1701 ****************************************************************************/
1702
1703 const char *smb_fn_name(int type)
1704 {
1705         const char *unknown_name = "SMBunknown";
1706
1707         if (smb_messages[type].name == NULL)
1708                 return(unknown_name);
1709
1710         return(smb_messages[type].name);
1711 }
1712
1713 /****************************************************************************
1714  Helper functions for contruct_reply.
1715 ****************************************************************************/
1716
1717 void add_to_common_flags2(uint32 v)
1718 {
1719         common_flags2 |= v;
1720 }
1721
1722 void remove_from_common_flags2(uint32 v)
1723 {
1724         common_flags2 &= ~v;
1725 }
1726
1727 static void construct_reply_common(struct smb_request *req, const char *inbuf,
1728                                    char *outbuf)
1729 {
1730         srv_set_message(outbuf,0,0,false);
1731
1732         SCVAL(outbuf, smb_com, req->cmd);
1733         SIVAL(outbuf,smb_rcls,0);
1734         SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1735         SSVAL(outbuf,smb_flg2,
1736                 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
1737                 common_flags2);
1738         memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1739
1740         SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1741         SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1742         SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1743         SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1744 }
1745
1746 void construct_reply_common_req(struct smb_request *req, char *outbuf)
1747 {
1748         construct_reply_common(req, (char *)req->inbuf, outbuf);
1749 }
1750
1751 /*
1752  * How many bytes have we already accumulated up to the current wct field
1753  * offset?
1754  */
1755
1756 size_t req_wct_ofs(struct smb_request *req)
1757 {
1758         size_t buf_size;
1759
1760         if (req->chain_outbuf == NULL) {
1761                 return smb_wct - 4;
1762         }
1763         buf_size = talloc_get_size(req->chain_outbuf);
1764         if ((buf_size % 4) != 0) {
1765                 buf_size += (4 - (buf_size % 4));
1766         }
1767         return buf_size - 4;
1768 }
1769
1770 /*
1771  * Hack around reply_nterror & friends not being aware of chained requests,
1772  * generating illegal (i.e. wct==0) chain replies.
1773  */
1774
1775 static void fixup_chain_error_packet(struct smb_request *req)
1776 {
1777         uint8_t *outbuf = req->outbuf;
1778         req->outbuf = NULL;
1779         reply_outbuf(req, 2, 0);
1780         memcpy(req->outbuf, outbuf, smb_wct);
1781         TALLOC_FREE(outbuf);
1782         SCVAL(req->outbuf, smb_vwv0, 0xff);
1783 }
1784
1785 /**
1786  * @brief Find the smb_cmd offset of the last command pushed
1787  * @param[in] buf       The buffer we're building up
1788  * @retval              Where can we put our next andx cmd?
1789  *
1790  * While chaining requests, the "next" request we're looking at needs to put
1791  * its SMB_Command before the data the previous request already built up added
1792  * to the chain. Find the offset to the place where we have to put our cmd.
1793  */
1794
1795 static bool find_andx_cmd_ofs(uint8_t *buf, size_t *pofs)
1796 {
1797         uint8_t cmd;
1798         size_t ofs;
1799
1800         cmd = CVAL(buf, smb_com);
1801
1802         SMB_ASSERT(is_andx_req(cmd));
1803
1804         ofs = smb_vwv0;
1805
1806         while (CVAL(buf, ofs) != 0xff) {
1807
1808                 if (!is_andx_req(CVAL(buf, ofs))) {
1809                         return false;
1810                 }
1811
1812                 /*
1813                  * ofs is from start of smb header, so add the 4 length
1814                  * bytes. The next cmd is right after the wct field.
1815                  */
1816                 ofs = SVAL(buf, ofs+2) + 4 + 1;
1817
1818                 SMB_ASSERT(ofs+4 < talloc_get_size(buf));
1819         }
1820
1821         *pofs = ofs;
1822         return true;
1823 }
1824
1825 /**
1826  * @brief Do the smb chaining at a buffer level
1827  * @param[in] poutbuf           Pointer to the talloc'ed buffer to be modified
1828  * @param[in] smb_command       The command that we want to issue
1829  * @param[in] wct               How many words?
1830  * @param[in] vwv               The words, already in network order
1831  * @param[in] bytes_alignment   How shall we align "bytes"?
1832  * @param[in] num_bytes         How many bytes?
1833  * @param[in] bytes             The data the request ships
1834  *
1835  * smb_splice_chain() adds the vwv and bytes to the request already present in
1836  * *poutbuf.
1837  */
1838
1839 static bool smb_splice_chain(uint8_t **poutbuf, uint8_t smb_command,
1840                              uint8_t wct, const uint16_t *vwv,
1841                              size_t bytes_alignment,
1842                              uint32_t num_bytes, const uint8_t *bytes)
1843 {
1844         uint8_t *outbuf;
1845         size_t old_size, new_size;
1846         size_t ofs;
1847         size_t chain_padding = 0;
1848         size_t bytes_padding = 0;
1849         bool first_request;
1850
1851         old_size = talloc_get_size(*poutbuf);
1852
1853         /*
1854          * old_size == smb_wct means we're pushing the first request in for
1855          * libsmb/
1856          */
1857
1858         first_request = (old_size == smb_wct);
1859
1860         if (!first_request && ((old_size % 4) != 0)) {
1861                 /*
1862                  * Align the wct field of subsequent requests to a 4-byte
1863                  * boundary
1864                  */
1865                 chain_padding = 4 - (old_size % 4);
1866         }
1867
1868         /*
1869          * After the old request comes the new wct field (1 byte), the vwv's
1870          * and the num_bytes field. After at we might need to align the bytes
1871          * given to us to "bytes_alignment", increasing the num_bytes value.
1872          */
1873
1874         new_size = old_size + chain_padding + 1 + wct * sizeof(uint16_t) + 2;
1875
1876         if ((bytes_alignment != 0) && ((new_size % bytes_alignment) != 0)) {
1877                 bytes_padding = bytes_alignment - (new_size % bytes_alignment);
1878         }
1879
1880         new_size += bytes_padding + num_bytes;
1881
1882         if ((smb_command != SMBwriteX) && (new_size > 0xffff)) {
1883                 DEBUG(1, ("splice_chain: %u bytes won't fit\n",
1884                           (unsigned)new_size));
1885                 return false;
1886         }
1887
1888         outbuf = TALLOC_REALLOC_ARRAY(NULL, *poutbuf, uint8_t, new_size);
1889         if (outbuf == NULL) {
1890                 DEBUG(0, ("talloc failed\n"));
1891                 return false;
1892         }
1893         *poutbuf = outbuf;
1894
1895         if (first_request) {
1896                 SCVAL(outbuf, smb_com, smb_command);
1897         } else {
1898                 size_t andx_cmd_ofs;
1899
1900                 if (!find_andx_cmd_ofs(outbuf, &andx_cmd_ofs)) {
1901                         DEBUG(1, ("invalid command chain\n"));
1902                         *poutbuf = TALLOC_REALLOC_ARRAY(
1903                                 NULL, *poutbuf, uint8_t, old_size);
1904                         return false;
1905                 }
1906
1907                 if (chain_padding != 0) {
1908                         memset(outbuf + old_size, 0, chain_padding);
1909                         old_size += chain_padding;
1910                 }
1911
1912                 SCVAL(outbuf, andx_cmd_ofs, smb_command);
1913                 SSVAL(outbuf, andx_cmd_ofs + 2, old_size - 4);
1914         }
1915
1916         ofs = old_size;
1917
1918         /*
1919          * Push the chained request:
1920          *
1921          * wct field
1922          */
1923
1924         SCVAL(outbuf, ofs, wct);
1925         ofs += 1;
1926
1927         /*
1928          * vwv array
1929          */
1930
1931         memcpy(outbuf + ofs, vwv, sizeof(uint16_t) * wct);
1932         ofs += sizeof(uint16_t) * wct;
1933
1934         /*
1935          * bcc (byte count)
1936          */
1937
1938         SSVAL(outbuf, ofs, num_bytes + bytes_padding);
1939         ofs += sizeof(uint16_t);
1940
1941         /*
1942          * padding
1943          */
1944
1945         if (bytes_padding != 0) {
1946                 memset(outbuf + ofs, 0, bytes_padding);
1947                 ofs += bytes_padding;
1948         }
1949
1950         /*
1951          * The bytes field
1952          */
1953
1954         memcpy(outbuf + ofs, bytes, num_bytes);
1955
1956         return true;
1957 }
1958
1959 /****************************************************************************
1960  Construct a chained reply and add it to the already made reply
1961 ****************************************************************************/
1962
1963 void chain_reply(struct smb_request *req)
1964 {
1965         size_t smblen = smb_len(req->inbuf);
1966         size_t already_used, length_needed;
1967         uint8_t chain_cmd;
1968         uint32_t chain_offset;  /* uint32_t to avoid overflow */
1969
1970         uint8_t wct;
1971         uint16_t *vwv;
1972         uint16_t buflen;
1973         uint8_t *buf;
1974
1975         if (IVAL(req->outbuf, smb_rcls) != 0) {
1976                 fixup_chain_error_packet(req);
1977         }
1978
1979         /*
1980          * Any of the AndX requests and replies have at least a wct of
1981          * 2. vwv[0] is the next command, vwv[1] is the offset from the
1982          * beginning of the SMB header to the next wct field.
1983          *
1984          * None of the AndX requests put anything valuable in vwv[0] and [1],
1985          * so we can overwrite it here to form the chain.
1986          */
1987
1988         if ((req->wct < 2) || (CVAL(req->outbuf, smb_wct) < 2)) {
1989                 if (req->chain_outbuf == NULL) {
1990                         req->chain_outbuf = TALLOC_REALLOC_ARRAY(
1991                                 req, req->outbuf, uint8_t,
1992                                 smb_len(req->outbuf) + 4);
1993                         if (req->chain_outbuf == NULL) {
1994                                 smb_panic("talloc failed");
1995                         }
1996                 }
1997                 req->outbuf = NULL;
1998                 goto error;
1999         }
2000
2001         /*
2002          * Here we assume that this is the end of the chain. For that we need
2003          * to set "next command" to 0xff and the offset to 0. If we later find
2004          * more commands in the chain, this will be overwritten again.
2005          */
2006
2007         SCVAL(req->outbuf, smb_vwv0, 0xff);
2008         SCVAL(req->outbuf, smb_vwv0+1, 0);
2009         SSVAL(req->outbuf, smb_vwv1, 0);
2010
2011         if (req->chain_outbuf == NULL) {
2012                 /*
2013                  * In req->chain_outbuf we collect all the replies. Start the
2014                  * chain by copying in the first reply.
2015                  *
2016                  * We do the realloc because later on we depend on
2017                  * talloc_get_size to determine the length of
2018                  * chain_outbuf. The reply_xxx routines might have
2019                  * over-allocated (reply_pipe_read_and_X used to be such an
2020                  * example).
2021                  */
2022                 req->chain_outbuf = TALLOC_REALLOC_ARRAY(
2023                         req, req->outbuf, uint8_t, smb_len(req->outbuf) + 4);
2024                 if (req->chain_outbuf == NULL) {
2025                         smb_panic("talloc failed");
2026                 }
2027                 req->outbuf = NULL;
2028         } else {
2029                 /*
2030                  * Update smb headers where subsequent chained commands
2031                  * may have updated them.
2032                  */
2033                 SCVAL(req->chain_outbuf, smb_tid, CVAL(req->outbuf, smb_tid));
2034                 SCVAL(req->chain_outbuf, smb_uid, CVAL(req->outbuf, smb_uid));
2035
2036                 if (!smb_splice_chain(&req->chain_outbuf,
2037                                       CVAL(req->outbuf, smb_com),
2038                                       CVAL(req->outbuf, smb_wct),
2039                                       (uint16_t *)(req->outbuf + smb_vwv),
2040                                       0, smb_buflen(req->outbuf),
2041                                       (uint8_t *)smb_buf(req->outbuf))) {
2042                         goto error;
2043                 }
2044                 TALLOC_FREE(req->outbuf);
2045         }
2046
2047         /*
2048          * We use the old request's vwv field to grab the next chained command
2049          * and offset into the chained fields.
2050          */
2051
2052         chain_cmd = CVAL(req->vwv+0, 0);
2053         chain_offset = SVAL(req->vwv+1, 0);
2054
2055         if (chain_cmd == 0xff) {
2056                 /*
2057                  * End of chain, no more requests from the client. So ship the
2058                  * replies.
2059                  */
2060                 smb_setlen((char *)(req->chain_outbuf),
2061                            talloc_get_size(req->chain_outbuf) - 4);
2062
2063                 if (!srv_send_smb(req->sconn, (char *)req->chain_outbuf,
2064                                   true, req->seqnum+1,
2065                                   IS_CONN_ENCRYPTED(req->conn)
2066                                   ||req->encrypted,
2067                                   &req->pcd)) {
2068                         exit_server_cleanly("chain_reply: srv_send_smb "
2069                                             "failed.");
2070                 }
2071                 TALLOC_FREE(req->chain_outbuf);
2072                 req->done = true;
2073                 return;
2074         }
2075
2076         /* add a new perfcounter for this element of chain */
2077         SMB_PERFCOUNT_ADD(&req->pcd);
2078         SMB_PERFCOUNT_SET_OP(&req->pcd, chain_cmd);
2079         SMB_PERFCOUNT_SET_MSGLEN_IN(&req->pcd, smblen);
2080
2081         /*
2082          * Check if the client tries to fool us. The request so far uses the
2083          * space to the end of the byte buffer in the request just
2084          * processed. The chain_offset can't point into that area. If that was
2085          * the case, we could end up with an endless processing of the chain,
2086          * we would always handle the same request.
2087          */
2088
2089         already_used = PTR_DIFF(req->buf+req->buflen, smb_base(req->inbuf));
2090         if (chain_offset < already_used) {
2091                 goto error;
2092         }
2093
2094         /*
2095          * Next check: Make sure the chain offset does not point beyond the
2096          * overall smb request length.
2097          */
2098
2099         length_needed = chain_offset+1; /* wct */
2100         if (length_needed > smblen) {
2101                 goto error;
2102         }
2103
2104         /*
2105          * Now comes the pointer magic. Goal here is to set up req->vwv and
2106          * req->buf correctly again to be able to call the subsequent
2107          * switch_message(). The chain offset (the former vwv[1]) points at
2108          * the new wct field.
2109          */
2110
2111         wct = CVAL(smb_base(req->inbuf), chain_offset);
2112
2113         /*
2114          * Next consistency check: Make the new vwv array fits in the overall
2115          * smb request.
2116          */
2117
2118         length_needed += (wct+1)*sizeof(uint16_t); /* vwv+buflen */
2119         if (length_needed > smblen) {
2120                 goto error;
2121         }
2122         vwv = (uint16_t *)(smb_base(req->inbuf) + chain_offset + 1);
2123
2124         /*
2125          * Now grab the new byte buffer....
2126          */
2127
2128         buflen = SVAL(vwv+wct, 0);
2129
2130         /*
2131          * .. and check that it fits.
2132          */
2133
2134         length_needed += buflen;
2135         if (length_needed > smblen) {
2136                 goto error;
2137         }
2138         buf = (uint8_t *)(vwv+wct+1);
2139
2140         req->cmd = chain_cmd;
2141         req->wct = wct;
2142         req->vwv = vwv;
2143         req->buflen = buflen;
2144         req->buf = buf;
2145
2146         switch_message(chain_cmd, req, smblen);
2147
2148         if (req->outbuf == NULL) {
2149                 /*
2150                  * This happens if the chained command has suspended itself or
2151                  * if it has called srv_send_smb() itself.
2152                  */
2153                 return;
2154         }
2155
2156         /*
2157          * We end up here if the chained command was not itself chained or
2158          * suspended, but for example a close() command. We now need to splice
2159          * the chained commands' outbuf into the already built up chain_outbuf
2160          * and ship the result.
2161          */
2162         goto done;
2163
2164  error:
2165         /*
2166          * We end up here if there's any error in the chain syntax. Report a
2167          * DOS error, just like Windows does.
2168          */
2169         reply_force_doserror(req, ERRSRV, ERRerror);
2170         fixup_chain_error_packet(req);
2171
2172  done:
2173         /*
2174          * This scary statement intends to set the
2175          * FLAGS2_32_BIT_ERROR_CODES flg2 field in req->chain_outbuf
2176          * to the value req->outbuf carries
2177          */
2178         SSVAL(req->chain_outbuf, smb_flg2,
2179               (SVAL(req->chain_outbuf, smb_flg2) & ~FLAGS2_32_BIT_ERROR_CODES)
2180               | (SVAL(req->outbuf, smb_flg2) & FLAGS2_32_BIT_ERROR_CODES));
2181
2182         /*
2183          * Transfer the error codes from the subrequest to the main one
2184          */
2185         SSVAL(req->chain_outbuf, smb_rcls, SVAL(req->outbuf, smb_rcls));
2186         SSVAL(req->chain_outbuf, smb_err, SVAL(req->outbuf, smb_err));
2187
2188         if (!smb_splice_chain(&req->chain_outbuf,
2189                               CVAL(req->outbuf, smb_com),
2190                               CVAL(req->outbuf, smb_wct),
2191                               (uint16_t *)(req->outbuf + smb_vwv),
2192                               0, smb_buflen(req->outbuf),
2193                               (uint8_t *)smb_buf(req->outbuf))) {
2194                 exit_server_cleanly("chain_reply: smb_splice_chain failed\n");
2195         }
2196         TALLOC_FREE(req->outbuf);
2197
2198         smb_setlen((char *)(req->chain_outbuf),
2199                    talloc_get_size(req->chain_outbuf) - 4);
2200
2201         show_msg((char *)(req->chain_outbuf));
2202
2203         if (!srv_send_smb(req->sconn, (char *)req->chain_outbuf,
2204                           true, req->seqnum+1,
2205                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
2206                           &req->pcd)) {
2207                 exit_server_cleanly("chain_reply: srv_send_smb failed.");
2208         }
2209         TALLOC_FREE(req->chain_outbuf);
2210         req->done = true;
2211 }
2212
2213 /****************************************************************************
2214  Check if services need reloading.
2215 ****************************************************************************/
2216
2217 static void check_reload(struct smbd_server_connection *sconn, time_t t)
2218 {
2219         time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
2220
2221         if(last_smb_conf_reload_time == 0) {
2222                 last_smb_conf_reload_time = t;
2223                 /* Our printing subsystem might not be ready at smbd start up.
2224                    Then no printer is available till the first printers check
2225                    is performed.  A lower initial interval circumvents this. */
2226                 if ( printcap_cache_time > 60 )
2227                         last_printer_reload_time = t - printcap_cache_time + 60;
2228                 else
2229                         last_printer_reload_time = t;
2230         }
2231
2232         if (mypid != getpid()) { /* First time or fork happened meanwhile */
2233                 /* randomize over 60 second the printcap reload to avoid all
2234                  * process hitting cupsd at the same time */
2235                 int time_range = 60;
2236
2237                 last_printer_reload_time += random() % time_range;
2238                 mypid = getpid();
2239         }
2240
2241         if (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK) {
2242                 reload_services(sconn->msg_ctx, sconn->sock, True);
2243                 last_smb_conf_reload_time = t;
2244         }
2245
2246         /* 'printcap cache time = 0' disable the feature */
2247
2248         if ( printcap_cache_time != 0 )
2249         {
2250                 /* see if it's time to reload or if the clock has been set back */
2251
2252                 if ( (t >= last_printer_reload_time+printcap_cache_time)
2253                         || (t-last_printer_reload_time  < 0) )
2254                 {
2255                         DEBUG( 3,( "Printcap cache time expired.\n"));
2256                         reload_printers(sconn->msg_ctx);
2257                         last_printer_reload_time = t;
2258                 }
2259         }
2260 }
2261
2262 static bool fd_is_readable(int fd)
2263 {
2264         fd_set fds;
2265         struct timeval timeout = {0, };
2266         int ret;
2267
2268         FD_ZERO(&fds);
2269         FD_SET(fd, &fds);
2270
2271         ret = sys_select(fd+1, &fds, NULL, NULL, &timeout);
2272         if (ret == -1) {
2273                 return false;
2274         }
2275         return FD_ISSET(fd, &fds);
2276 }
2277
2278 static void smbd_server_connection_write_handler(struct smbd_server_connection *conn)
2279 {
2280         /* TODO: make write nonblocking */
2281 }
2282
2283 static void smbd_server_connection_read_handler(
2284         struct smbd_server_connection *conn, int fd)
2285 {
2286         uint8_t *inbuf = NULL;
2287         size_t inbuf_len = 0;
2288         size_t unread_bytes = 0;
2289         bool encrypted = false;
2290         TALLOC_CTX *mem_ctx = talloc_tos();
2291         NTSTATUS status;
2292         uint32_t seqnum;
2293
2294         bool from_client = (conn->sock == fd);
2295
2296         if (from_client) {
2297                 smbd_lock_socket(conn);
2298
2299                 if (!fd_is_readable(fd)) {
2300                         DEBUG(10,("the echo listener was faster\n"));
2301                         smbd_unlock_socket(conn);
2302                         return;
2303                 }
2304
2305                 /* TODO: make this completely nonblocking */
2306                 status = receive_smb_talloc(mem_ctx, fd,
2307                                             (char **)(void *)&inbuf,
2308                                             0, /* timeout */
2309                                             &unread_bytes,
2310                                             &encrypted,
2311                                             &inbuf_len, &seqnum,
2312                                             false /* trusted channel */);
2313                 smbd_unlock_socket(conn);
2314         } else {
2315                 /* TODO: make this completely nonblocking */
2316                 status = receive_smb_talloc(mem_ctx, fd,
2317                                             (char **)(void *)&inbuf,
2318                                             0, /* timeout */
2319                                             &unread_bytes,
2320                                             &encrypted,
2321                                             &inbuf_len, &seqnum,
2322                                             true /* trusted channel */);
2323         }
2324
2325         if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
2326                 goto process;
2327         }
2328         if (NT_STATUS_IS_ERR(status)) {
2329                 exit_server_cleanly("failed to receive smb request");
2330         }
2331         if (!NT_STATUS_IS_OK(status)) {
2332                 return;
2333         }
2334
2335 process:
2336         process_smb(conn, inbuf, inbuf_len, unread_bytes,
2337                     seqnum, encrypted, NULL);
2338 }
2339
2340 static void smbd_server_connection_handler(struct event_context *ev,
2341                                            struct fd_event *fde,
2342                                            uint16_t flags,
2343                                            void *private_data)
2344 {
2345         struct smbd_server_connection *conn = talloc_get_type(private_data,
2346                                               struct smbd_server_connection);
2347
2348         if (flags & EVENT_FD_WRITE) {
2349                 smbd_server_connection_write_handler(conn);
2350                 return;
2351         }
2352         if (flags & EVENT_FD_READ) {
2353                 smbd_server_connection_read_handler(conn, conn->sock);
2354                 return;
2355         }
2356 }
2357
2358 static void smbd_server_echo_handler(struct event_context *ev,
2359                                      struct fd_event *fde,
2360                                      uint16_t flags,
2361                                      void *private_data)
2362 {
2363         struct smbd_server_connection *conn = talloc_get_type(private_data,
2364                                               struct smbd_server_connection);
2365
2366         if (flags & EVENT_FD_WRITE) {
2367                 smbd_server_connection_write_handler(conn);
2368                 return;
2369         }
2370         if (flags & EVENT_FD_READ) {
2371                 smbd_server_connection_read_handler(
2372                         conn, conn->smb1.echo_handler.trusted_fd);
2373                 return;
2374         }
2375 }
2376
2377 /****************************************************************************
2378 received when we should release a specific IP
2379 ****************************************************************************/
2380 static void release_ip(const char *ip, void *priv)
2381 {
2382         const char *addr = (const char *)priv;
2383         const char *p = addr;
2384
2385         if (strncmp("::ffff:", addr, 7) == 0) {
2386                 p = addr + 7;
2387         }
2388
2389         if ((strcmp(p, ip) == 0) || ((p != addr) && strcmp(addr, ip) == 0)) {
2390                 /* we can't afford to do a clean exit - that involves
2391                    database writes, which would potentially mean we
2392                    are still running after the failover has finished -
2393                    we have to get rid of this process ID straight
2394                    away */
2395                 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
2396                         ip));
2397                 /* note we must exit with non-zero status so the unclean handler gets
2398                    called in the parent, so that the brl database is tickled */
2399                 _exit(1);
2400         }
2401 }
2402
2403 static void msg_release_ip(struct messaging_context *msg_ctx, void *private_data,
2404                            uint32_t msg_type, struct server_id server_id, DATA_BLOB *data)
2405 {
2406         struct smbd_server_connection *sconn = talloc_get_type_abort(
2407                 private_data, struct smbd_server_connection);
2408
2409         release_ip((char *)data->data, sconn->client_id.addr);
2410 }
2411
2412 #ifdef CLUSTER_SUPPORT
2413 static int client_get_tcp_info(struct sockaddr_storage *server,
2414                                struct sockaddr_storage *client)
2415 {
2416         socklen_t length;
2417         if (server_fd == -1) {
2418                 return -1;
2419         }
2420         length = sizeof(*server);
2421         if (getsockname(server_fd, (struct sockaddr *)server, &length) != 0) {
2422                 return -1;
2423         }
2424         length = sizeof(*client);
2425         if (getpeername(server_fd, (struct sockaddr *)client, &length) != 0) {
2426                 return -1;
2427         }
2428         return 0;
2429 }
2430 #endif
2431
2432 /*
2433  * Send keepalive packets to our client
2434  */
2435 static bool keepalive_fn(const struct timeval *now, void *private_data)
2436 {
2437         struct smbd_server_connection *sconn = smbd_server_conn;
2438         bool ret;
2439
2440         if (sconn->using_smb2) {
2441                 /* Don't do keepalives on an SMB2 connection. */
2442                 return false;
2443         }
2444
2445         smbd_lock_socket(smbd_server_conn);
2446         ret = send_keepalive(sconn->sock);
2447         smbd_unlock_socket(smbd_server_conn);
2448
2449         if (!ret) {
2450                 char addr[INET6_ADDRSTRLEN];
2451                 /*
2452                  * Try and give an error message saying what
2453                  * client failed.
2454                  */
2455                 DEBUG(0, ("send_keepalive failed for client %s. "
2456                           "Error %s - exiting\n",
2457                           get_peer_addr(sconn->sock, addr, sizeof(addr)),
2458                           strerror(errno)));
2459                 return False;
2460         }
2461         return True;
2462 }
2463
2464 /*
2465  * Do the recurring check if we're idle
2466  */
2467 static bool deadtime_fn(const struct timeval *now, void *private_data)
2468 {
2469         struct smbd_server_connection *sconn =
2470                 (struct smbd_server_connection *)private_data;
2471
2472         if (sconn->using_smb2) {
2473                 /* TODO: implement real idle check */
2474                 if (sconn->smb2.sessions.list) {
2475                         return true;
2476                 }
2477                 DEBUG( 2, ( "Closing idle SMB2 connection\n" ) );
2478                 messaging_send(sconn->msg_ctx, procid_self(),
2479                                MSG_SHUTDOWN, &data_blob_null);
2480                 return false;
2481         }
2482
2483         if ((conn_num_open(sconn) == 0)
2484             || (conn_idle_all(sconn, now->tv_sec))) {
2485                 DEBUG( 2, ( "Closing idle SMB1 connection\n" ) );
2486                 messaging_send(sconn->msg_ctx, procid_self(),
2487                                MSG_SHUTDOWN, &data_blob_null);
2488                 return False;
2489         }
2490
2491         return True;
2492 }
2493
2494 /*
2495  * Do the recurring log file and smb.conf reload checks.
2496  */
2497
2498 static bool housekeeping_fn(const struct timeval *now, void *private_data)
2499 {
2500         struct smbd_server_connection *sconn = talloc_get_type_abort(
2501                 private_data, struct smbd_server_connection);
2502         change_to_root_user();
2503
2504         /* update printer queue caches if necessary */
2505         update_monitored_printq_cache(sconn->msg_ctx);
2506
2507         /* check if we need to reload services */
2508         check_reload(sconn, time(NULL));
2509
2510         /* Change machine password if neccessary. */
2511         attempt_machine_password_change();
2512
2513         /*
2514          * Force a log file check.
2515          */
2516         force_check_log_size();
2517         check_log_size();
2518         return true;
2519 }
2520
2521 static int create_unlink_tmp(const char *dir)
2522 {
2523         char *fname;
2524         int fd;
2525
2526         fname = talloc_asprintf(talloc_tos(), "%s/listenerlock_XXXXXX", dir);
2527         if (fname == NULL) {
2528                 errno = ENOMEM;
2529                 return -1;
2530         }
2531         fd = mkstemp(fname);
2532         if (fd == -1) {
2533                 TALLOC_FREE(fname);
2534                 return -1;
2535         }
2536         if (unlink(fname) == -1) {
2537                 int sys_errno = errno;
2538                 close(fd);
2539                 TALLOC_FREE(fname);
2540                 errno = sys_errno;
2541                 return -1;
2542         }
2543         TALLOC_FREE(fname);
2544         return fd;
2545 }
2546
2547 struct smbd_echo_state {
2548         struct tevent_context *ev;
2549         struct iovec *pending;
2550         struct smbd_server_connection *sconn;
2551         int parent_pipe;
2552
2553         struct tevent_fd *parent_fde;
2554
2555         struct tevent_fd *read_fde;
2556         struct tevent_req *write_req;
2557 };
2558
2559 static void smbd_echo_writer_done(struct tevent_req *req);
2560
2561 static void smbd_echo_activate_writer(struct smbd_echo_state *state)
2562 {
2563         int num_pending;
2564
2565         if (state->write_req != NULL) {
2566                 return;
2567         }
2568
2569         num_pending = talloc_array_length(state->pending);
2570         if (num_pending == 0) {
2571                 return;
2572         }
2573
2574         state->write_req = writev_send(state, state->ev, NULL,
2575                                        state->parent_pipe, false,
2576                                        state->pending, num_pending);
2577         if (state->write_req == NULL) {
2578                 DEBUG(1, ("writev_send failed\n"));
2579                 exit(1);
2580         }
2581
2582         talloc_steal(state->write_req, state->pending);
2583         state->pending = NULL;
2584
2585         tevent_req_set_callback(state->write_req, smbd_echo_writer_done,
2586                                 state);
2587 }
2588
2589 static void smbd_echo_writer_done(struct tevent_req *req)
2590 {
2591         struct smbd_echo_state *state = tevent_req_callback_data(
2592                 req, struct smbd_echo_state);
2593         ssize_t written;
2594         int err;
2595
2596         written = writev_recv(req, &err);
2597         TALLOC_FREE(req);
2598         state->write_req = NULL;
2599         if (written == -1) {
2600                 DEBUG(1, ("writev to parent failed: %s\n", strerror(err)));
2601                 exit(1);
2602         }
2603         DEBUG(10,("echo_handler[%d]: forwarded pdu to main\n", (int)sys_getpid()));
2604         smbd_echo_activate_writer(state);
2605 }
2606
2607 static bool smbd_echo_reply(uint8_t *inbuf, size_t inbuf_len,
2608                             uint32_t seqnum)
2609 {
2610         struct smb_request req;
2611         uint16_t num_replies;
2612         size_t out_len;
2613         char *outbuf;
2614         bool ok;
2615
2616         if (inbuf_len < smb_size) {
2617                 DEBUG(10, ("Got short packet: %d bytes\n", (int)inbuf_len));
2618                 return false;
2619         }
2620         if (!valid_smb_header(inbuf)) {
2621                 DEBUG(10, ("Got invalid SMB header\n"));
2622                 return false;
2623         }
2624
2625         if (!init_smb_request(&req, smbd_server_conn, inbuf, 0, false,
2626                               seqnum)) {
2627                 return false;
2628         }
2629         req.inbuf = inbuf;
2630
2631         DEBUG(10, ("smbecho handler got cmd %d (%s)\n", (int)req.cmd,
2632                    smb_messages[req.cmd].name
2633                    ? smb_messages[req.cmd].name : "unknown"));
2634
2635         if (req.cmd != SMBecho) {
2636                 return false;
2637         }
2638         if (req.wct < 1) {
2639                 return false;
2640         }
2641
2642         num_replies = SVAL(req.vwv+0, 0);
2643         if (num_replies != 1) {
2644                 /* Not a Windows "Hey, you're still there?" request */
2645                 return false;
2646         }
2647
2648         if (!create_outbuf(talloc_tos(), &req, (char *)req.inbuf, &outbuf,
2649                            1, req.buflen)) {
2650                 DEBUG(10, ("create_outbuf failed\n"));
2651                 return false;
2652         }
2653         req.outbuf = (uint8_t *)outbuf;
2654
2655         SSVAL(req.outbuf, smb_vwv0, num_replies);
2656
2657         if (req.buflen > 0) {
2658                 memcpy(smb_buf(req.outbuf), req.buf, req.buflen);
2659         }
2660
2661         out_len = smb_len(req.outbuf) + 4;
2662
2663         ok = srv_send_smb(req.sconn,
2664                           (char *)outbuf,
2665                           true, seqnum+1,
2666                           false, &req.pcd);
2667         TALLOC_FREE(outbuf);
2668         if (!ok) {
2669                 exit(1);
2670         }
2671
2672         return true;
2673 }
2674
2675 static void smbd_echo_exit(struct tevent_context *ev,
2676                            struct tevent_fd *fde, uint16_t flags,
2677                            void *private_data)
2678 {
2679         DEBUG(2, ("smbd_echo_exit: lost connection to parent\n"));
2680         exit(0);
2681 }
2682
2683 static void smbd_echo_reader(struct tevent_context *ev,
2684                              struct tevent_fd *fde, uint16_t flags,
2685                              void *private_data)
2686 {
2687         struct smbd_echo_state *state = talloc_get_type_abort(
2688                 private_data, struct smbd_echo_state);
2689         struct smbd_server_connection *sconn = state->sconn;
2690         size_t unread, num_pending;
2691         NTSTATUS status;
2692         struct iovec *tmp;
2693         size_t iov_len;
2694         uint32_t seqnum = 0;
2695         bool reply;
2696         bool ok;
2697         bool encrypted = false;
2698
2699         smb_msleep(1000);
2700
2701         ok = smbd_lock_socket_internal(sconn);
2702         if (!ok) {
2703                 DEBUG(0, ("%s: failed to lock socket\n",
2704                         __location__));
2705                 exit(1);
2706         }
2707
2708         if (!fd_is_readable(sconn->sock)) {
2709                 DEBUG(10,("echo_handler[%d] the parent smbd was faster\n",
2710                           (int)sys_getpid()));
2711                 ok = smbd_unlock_socket_internal(sconn);
2712                 if (!ok) {
2713                         DEBUG(1, ("%s: failed to unlock socket in\n",
2714                                 __location__));
2715                         exit(1);
2716                 }
2717                 return;
2718         }
2719
2720         num_pending = talloc_array_length(state->pending);
2721         tmp = talloc_realloc(state, state->pending, struct iovec,
2722                              num_pending+1);
2723         if (tmp == NULL) {
2724                 DEBUG(1, ("talloc_realloc failed\n"));
2725                 exit(1);
2726         }
2727         state->pending = tmp;
2728
2729         DEBUG(10,("echo_handler[%d]: reading pdu\n", (int)sys_getpid()));
2730
2731         status = receive_smb_talloc(state->pending, sconn->sock,
2732                                     (char **)(void *)&state->pending[num_pending].iov_base,
2733                                     0 /* timeout */,
2734                                     &unread,
2735                                     &encrypted,
2736                                     &iov_len,
2737                                     &seqnum,
2738                                     false /* trusted_channel*/);
2739         if (!NT_STATUS_IS_OK(status)) {
2740                 DEBUG(1, ("echo_handler[%d]: receive_smb_raw_talloc failed: %s\n",
2741                           (int)sys_getpid(), nt_errstr(status)));
2742                 exit(1);
2743         }
2744         state->pending[num_pending].iov_len = iov_len;
2745
2746         ok = smbd_unlock_socket_internal(sconn);
2747         if (!ok) {
2748                 DEBUG(1, ("%s: failed to unlock socket in\n",
2749                         __location__));
2750                 exit(1);
2751         }
2752
2753         /*
2754          * place the seqnum in the packet so that the main process can reply
2755          * with signing
2756          */
2757         SIVAL((uint8_t *)state->pending[num_pending].iov_base, smb_ss_field, seqnum);
2758         SIVAL((uint8_t *)state->pending[num_pending].iov_base, smb_ss_field+4, NT_STATUS_V(NT_STATUS_OK));
2759
2760         reply = smbd_echo_reply((uint8_t *)state->pending[num_pending].iov_base,
2761                                 state->pending[num_pending].iov_len,
2762                                 seqnum);
2763         if (reply) {
2764                 DEBUG(10,("echo_handler[%d]: replied to client\n", (int)sys_getpid()));
2765                 /* no check, shrinking by some bytes does not fail */
2766                 state->pending = talloc_realloc(state, state->pending,
2767                                                 struct iovec,
2768                                                 num_pending);
2769         } else {
2770                 DEBUG(10,("echo_handler[%d]: forward to main\n", (int)sys_getpid()));
2771                 smbd_echo_activate_writer(state);
2772         }
2773 }
2774
2775 static void smbd_echo_loop(struct smbd_server_connection *sconn,
2776                            int parent_pipe)
2777 {
2778         struct smbd_echo_state *state;
2779
2780         state = talloc_zero(sconn, struct smbd_echo_state);
2781         if (state == NULL) {
2782                 DEBUG(1, ("talloc failed\n"));
2783                 return;
2784         }
2785         state->sconn = sconn;
2786         state->parent_pipe = parent_pipe;
2787         state->ev = s3_tevent_context_init(state);
2788         if (state->ev == NULL) {
2789                 DEBUG(1, ("tevent_context_init failed\n"));
2790                 TALLOC_FREE(state);
2791                 return;
2792         }
2793         state->parent_fde = tevent_add_fd(state->ev, state, parent_pipe,
2794                                         TEVENT_FD_READ, smbd_echo_exit,
2795                                         state);
2796         if (state->parent_fde == NULL) {
2797                 DEBUG(1, ("tevent_add_fd failed\n"));
2798                 TALLOC_FREE(state);
2799                 return;
2800         }
2801         state->read_fde = tevent_add_fd(state->ev, state, sconn->sock,
2802                                         TEVENT_FD_READ, smbd_echo_reader,
2803                                         state);
2804         if (state->read_fde == NULL) {
2805                 DEBUG(1, ("tevent_add_fd failed\n"));
2806                 TALLOC_FREE(state);
2807                 return;
2808         }
2809
2810         while (true) {
2811                 if (tevent_loop_once(state->ev) == -1) {
2812                         DEBUG(1, ("tevent_loop_once failed: %s\n",
2813                                   strerror(errno)));
2814                         break;
2815                 }
2816         }
2817         TALLOC_FREE(state);
2818 }
2819
2820 /*
2821  * Handle SMBecho requests in a forked child process
2822  */
2823 static bool fork_echo_handler(struct smbd_server_connection *sconn)
2824 {
2825         int listener_pipe[2];
2826         int res;
2827         pid_t child;
2828
2829         res = pipe(listener_pipe);
2830         if (res == -1) {
2831                 DEBUG(1, ("pipe() failed: %s\n", strerror(errno)));
2832                 return false;
2833         }
2834         sconn->smb1.echo_handler.socket_lock_fd = create_unlink_tmp(lp_lockdir());
2835         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
2836                 DEBUG(1, ("Could not create lock fd: %s\n", strerror(errno)));
2837                 goto fail;
2838         }
2839
2840         child = sys_fork();
2841         if (child == 0) {
2842                 NTSTATUS status;
2843
2844                 close(listener_pipe[0]);
2845
2846                 status = reinit_after_fork(sconn->msg_ctx,
2847                                            smbd_event_context(),
2848                                            procid_self(), false);
2849                 if (!NT_STATUS_IS_OK(status)) {
2850                         DEBUG(1, ("reinit_after_fork failed: %s\n",
2851                                   nt_errstr(status)));
2852                         exit(1);
2853                 }
2854                 smbd_echo_loop(sconn, listener_pipe[1]);
2855                 exit(0);
2856         }
2857         close(listener_pipe[1]);
2858         listener_pipe[1] = -1;
2859         sconn->smb1.echo_handler.trusted_fd = listener_pipe[0];
2860
2861         DEBUG(10,("fork_echo_handler: main[%d] echo_child[%d]\n", (int)sys_getpid(), child));
2862
2863         /*
2864          * Without smb signing this is the same as the normal smbd
2865          * listener. This needs to change once signing comes in.
2866          */
2867         sconn->smb1.echo_handler.trusted_fde = event_add_fd(smbd_event_context(),
2868                                         sconn,
2869                                         sconn->smb1.echo_handler.trusted_fd,
2870                                         EVENT_FD_READ,
2871                                         smbd_server_echo_handler,
2872                                         sconn);
2873         if (sconn->smb1.echo_handler.trusted_fde == NULL) {
2874                 DEBUG(1, ("event_add_fd failed\n"));
2875                 goto fail;
2876         }
2877
2878         return true;
2879
2880 fail:
2881         if (listener_pipe[0] != -1) {
2882                 close(listener_pipe[0]);
2883         }
2884         if (listener_pipe[1] != -1) {
2885                 close(listener_pipe[1]);
2886         }
2887         sconn->smb1.echo_handler.trusted_fd = -1;
2888         if (sconn->smb1.echo_handler.socket_lock_fd != -1) {
2889                 close(sconn->smb1.echo_handler.socket_lock_fd);
2890         }
2891         sconn->smb1.echo_handler.trusted_fd = -1;
2892         sconn->smb1.echo_handler.socket_lock_fd = -1;
2893         return false;
2894 }
2895
2896 #if CLUSTER_SUPPORT
2897
2898 static NTSTATUS smbd_register_ips(struct smbd_server_connection *sconn,
2899                                   struct sockaddr_storage *srv,
2900                                   struct sockaddr_storage *clnt)
2901 {
2902         struct ctdbd_connection *cconn;
2903         char tmp_addr[INET6_ADDRSTRLEN];
2904         char *addr;
2905
2906         cconn = messaging_ctdbd_connection();
2907         if (cconn == NULL) {
2908                 return NT_STATUS_NO_MEMORY;
2909         }
2910
2911         client_socket_addr(sconn->sock, tmp_addr, sizeof(tmp_addr));
2912         addr = talloc_strdup(cconn, tmp_addr);
2913         if (addr == NULL) {
2914                 return NT_STATUS_NO_MEMORY;
2915         }
2916         return ctdbd_register_ips(cconn, srv, clnt, release_ip, addr);
2917 }
2918
2919 #endif
2920
2921 /****************************************************************************
2922  Process commands from the client
2923 ****************************************************************************/
2924
2925 void smbd_process(struct smbd_server_connection *sconn)
2926 {
2927         TALLOC_CTX *frame = talloc_stackframe();
2928         struct sockaddr_storage ss;
2929         struct sockaddr *sa = NULL;
2930         socklen_t sa_socklen;
2931         struct tsocket_address *local_address = NULL;
2932         struct tsocket_address *remote_address = NULL;
2933         const char *remaddr = NULL;
2934         int ret;
2935
2936         if (lp_maxprotocol() == PROTOCOL_SMB2 &&
2937             lp_security() != SEC_SHARE &&
2938             !lp_async_smb_echo_handler()) {
2939                 /*
2940                  * We're not making the desion here,
2941                  * we're just allowing the client
2942                  * to decide between SMB1 and SMB2
2943                  * with the first negprot
2944                  * packet.
2945                  */
2946                 sconn->using_smb2 = true;
2947         }
2948
2949         /* Ensure child is set to blocking mode */
2950         set_blocking(sconn->sock,True);
2951
2952         set_socket_options(sconn->sock, "SO_KEEPALIVE");
2953         set_socket_options(sconn->sock, lp_socket_options());
2954
2955         sa = (struct sockaddr *)(void *)&ss;
2956         sa_socklen = sizeof(ss);
2957         ret = getpeername(sconn->sock, sa, &sa_socklen);
2958         if (ret != 0) {
2959                 int level = (errno == ENOTCONN)?2:0;
2960                 DEBUG(level,("getpeername() failed - %s\n", strerror(errno)));
2961                 exit_server_cleanly("getpeername() failed.\n");
2962         }
2963         ret = tsocket_address_bsd_from_sockaddr(sconn,
2964                                                 sa, sa_socklen,
2965                                                 &remote_address);
2966         if (ret != 0) {
2967                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
2968                         __location__, strerror(errno)));
2969                 exit_server_cleanly("tsocket_address_bsd_from_sockaddr remote failed.\n");
2970         }
2971
2972         sa = (struct sockaddr *)(void *)&ss;
2973         sa_socklen = sizeof(ss);
2974         ret = getsockname(sconn->sock, sa, &sa_socklen);
2975         if (ret != 0) {
2976                 int level = (errno == ENOTCONN)?2:0;
2977                 DEBUG(level,("getsockname() failed - %s\n", strerror(errno)));
2978                 exit_server_cleanly("getsockname() failed.\n");
2979         }
2980         ret = tsocket_address_bsd_from_sockaddr(sconn,
2981                                                 sa, sa_socklen,
2982                                                 &local_address);
2983         if (ret != 0) {
2984                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
2985                         __location__, strerror(errno)));
2986                 exit_server_cleanly("tsocket_address_bsd_from_sockaddr remote failed.\n");
2987         }
2988
2989         sconn->local_address = local_address;
2990         sconn->remote_address = remote_address;
2991
2992         if (tsocket_address_is_inet(remote_address, "ip")) {
2993                 remaddr = tsocket_address_inet_addr_string(
2994                                 sconn->remote_address,
2995                                 talloc_tos());
2996                 if (remaddr == NULL) {
2997
2998                 }
2999         } else {
3000                 remaddr = "0.0.0.0";
3001         }
3002
3003         /* this is needed so that we get decent entries
3004            in smbstatus for port 445 connects */
3005         set_remote_machine_name(remaddr, false);
3006         reload_services(sconn->msg_ctx, sconn->sock, true);
3007
3008         /*
3009          * Before the first packet, check the global hosts allow/ hosts deny
3010          * parameters before doing any parsing of packets passed to us by the
3011          * client. This prevents attacks on our parsing code from hosts not in
3012          * the hosts allow list.
3013          */
3014
3015         if (!allow_access(lp_hostsdeny(-1), lp_hostsallow(-1),
3016                           sconn->client_id.name,
3017                           sconn->client_id.addr)) {
3018                 /*
3019                  * send a negative session response "not listening on calling
3020                  * name"
3021                  */
3022                 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
3023                 DEBUG( 1, ("Connection denied from %s to %s\n",
3024                            tsocket_address_string(remote_address, talloc_tos()),
3025                            tsocket_address_string(local_address, talloc_tos())));
3026                 (void)srv_send_smb(sconn,(char *)buf, false,
3027                                    0, false, NULL);
3028                 exit_server_cleanly("connection denied");
3029         }
3030
3031         DEBUG(10, ("Connection allowed from %s to %s\n",
3032                    tsocket_address_string(remote_address, talloc_tos()),
3033                    tsocket_address_string(local_address, talloc_tos())));
3034
3035         init_modules();
3036
3037         smb_perfcount_init();
3038
3039         if (!init_account_policy()) {
3040                 exit_server("Could not open account policy tdb.\n");
3041         }
3042
3043         if (*lp_rootdir()) {
3044                 if (chroot(lp_rootdir()) != 0) {
3045                         DEBUG(0,("Failed to change root to %s\n", lp_rootdir()));
3046                         exit_server("Failed to chroot()");
3047                 }
3048                 if (chdir("/") == -1) {
3049                         DEBUG(0,("Failed to chdir to / on chroot to %s\n", lp_rootdir()));
3050                         exit_server("Failed to chroot()");
3051                 }
3052                 DEBUG(0,("Changed root to %s\n", lp_rootdir()));
3053         }
3054
3055         if (!srv_init_signing(sconn)) {
3056                 exit_server("Failed to init smb_signing");
3057         }
3058
3059         if (lp_async_smb_echo_handler() && !fork_echo_handler(sconn)) {
3060                 exit_server("Failed to fork echo handler");
3061         }
3062
3063         /* Setup oplocks */
3064         if (!init_oplocks(sconn->msg_ctx))
3065                 exit_server("Failed to init oplocks");
3066
3067         /* register our message handlers */
3068         messaging_register(sconn->msg_ctx, NULL,
3069                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
3070         messaging_register(sconn->msg_ctx, sconn,
3071                            MSG_SMB_RELEASE_IP, msg_release_ip);
3072         messaging_register(sconn->msg_ctx, NULL,
3073                            MSG_SMB_CLOSE_FILE, msg_close_file);
3074
3075         /*
3076          * Use the default MSG_DEBUG handler to avoid rebroadcasting
3077          * MSGs to all child processes
3078          */
3079         messaging_deregister(sconn->msg_ctx,
3080                              MSG_DEBUG, NULL);
3081         messaging_register(sconn->msg_ctx, NULL,
3082                            MSG_DEBUG, debug_message);
3083
3084         if ((lp_keepalive() != 0)
3085             && !(event_add_idle(smbd_event_context(), NULL,
3086                                 timeval_set(lp_keepalive(), 0),
3087                                 "keepalive", keepalive_fn,
3088                                 NULL))) {
3089                 DEBUG(0, ("Could not add keepalive event\n"));
3090                 exit(1);
3091         }
3092
3093         if (!(event_add_idle(smbd_event_context(), NULL,
3094                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
3095                              "deadtime", deadtime_fn, sconn))) {
3096                 DEBUG(0, ("Could not add deadtime event\n"));
3097                 exit(1);
3098         }
3099
3100         if (!(event_add_idle(smbd_event_context(), NULL,
3101                              timeval_set(SMBD_SELECT_TIMEOUT, 0),
3102                              "housekeeping", housekeeping_fn, sconn))) {
3103                 DEBUG(0, ("Could not add housekeeping event\n"));
3104                 exit(1);
3105         }
3106
3107 #ifdef CLUSTER_SUPPORT
3108
3109         if (lp_clustering()) {
3110                 /*
3111                  * We need to tell ctdb about our client's TCP
3112                  * connection, so that for failover ctdbd can send
3113                  * tickle acks, triggering a reconnection by the
3114                  * client.
3115                  */
3116
3117                 struct sockaddr_storage srv, clnt;
3118
3119                 if (client_get_tcp_info(&srv, &clnt) == 0) {
3120                         NTSTATUS status;
3121                         status = smbd_register_ips(sconn, &srv, &clnt);
3122                         if (!NT_STATUS_IS_OK(status)) {
3123                                 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
3124                                           nt_errstr(status)));
3125                         }
3126                 } else
3127                 {
3128                         DEBUG(0,("Unable to get tcp info for "
3129                                  "CTDB_CONTROL_TCP_CLIENT: %s\n",
3130                                  strerror(errno)));
3131                 }
3132         }
3133
3134 #endif
3135
3136         sconn->nbt.got_session = false;
3137
3138         sconn->smb1.negprot.max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
3139
3140         sconn->smb1.sessions.done_sesssetup = false;
3141         sconn->smb1.sessions.max_send = BUFFER_SIZE;
3142         sconn->smb1.sessions.last_session_tag = UID_FIELD_INVALID;
3143         /* users from session setup */
3144         sconn->smb1.sessions.session_userlist = NULL;
3145         /* workgroup from session setup. */
3146         sconn->smb1.sessions.session_workgroup = NULL;
3147         /* this holds info on user ids that are already validated for this VC */
3148         sconn->smb1.sessions.validated_users = NULL;
3149         sconn->smb1.sessions.next_vuid = VUID_OFFSET;
3150         sconn->smb1.sessions.num_validated_vuids = 0;
3151
3152         conn_init(sconn);
3153         if (!init_dptrs(sconn)) {
3154                 exit_server("init_dptrs() failed");
3155         }
3156
3157         sconn->smb1.fde = event_add_fd(smbd_event_context(),
3158                                                   sconn,
3159                                                   sconn->sock,
3160                                                   EVENT_FD_READ,
3161                                                   smbd_server_connection_handler,
3162                                                   sconn);
3163         if (!sconn->smb1.fde) {
3164                 exit_server("failed to create smbd_server_connection fde");
3165         }
3166
3167         TALLOC_FREE(frame);
3168
3169         while (True) {
3170                 NTSTATUS status;
3171
3172                 frame = talloc_stackframe_pool(8192);
3173
3174                 errno = 0;
3175
3176                 status = smbd_server_connection_loop_once(sconn);
3177                 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY) &&
3178                     !NT_STATUS_IS_OK(status)) {
3179                         DEBUG(3, ("smbd_server_connection_loop_once failed: %s,"
3180                                   " exiting\n", nt_errstr(status)));
3181                         break;
3182                 }
3183
3184                 TALLOC_FREE(frame);
3185         }
3186
3187         exit_server_cleanly(NULL);
3188 }
3189
3190 bool req_is_in_chain(struct smb_request *req)
3191 {
3192         if (req->vwv != (uint16_t *)(req->inbuf+smb_vwv)) {
3193                 /*
3194                  * We're right now handling a subsequent request, so we must
3195                  * be in a chain
3196                  */
3197                 return true;
3198         }
3199
3200         if (!is_andx_req(req->cmd)) {
3201                 return false;
3202         }
3203
3204         if (req->wct < 2) {
3205                 /*
3206                  * Okay, an illegal request, but definitely not chained :-)
3207                  */
3208                 return false;
3209         }
3210
3211         return (CVAL(req->vwv+0, 0) != 0xFF);
3212 }