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
  24 extern bool global_machine_password_needs_changing;
  25
  26 static void construct_reply_common(struct smb_request *req, const char *inbuf,
  27                                    char *outbuf);
  28
  29 /* Accessor function for smb_read_error for smbd functions. */
  30
  31 /****************************************************************************
  32  Send an smb to a fd.
  33 ****************************************************************************/
  34
  35 bool srv_send_smb(int fd, char *buffer, bool do_encrypt)
  36 {
  37         size_t len;
  38         size_t nwritten=0;
  39         ssize_t ret;
  40         char *buf_out = buffer;
  41
  42         /* Sign the outgoing packet if required. */
  43         srv_calculate_sign_mac(buf_out);
  44
  45         if (do_encrypt) {
  46                 NTSTATUS status = srv_encrypt_buffer(buffer, &buf_out);
  47                 if (!NT_STATUS_IS_OK(status)) {
  48                         DEBUG(0, ("send_smb: SMB encryption failed "
  49                                 "on outgoing packet! Error %s\n",
  50                                 nt_errstr(status) ));
  51                         return false;
  52                 }
  53         }
  54
  55         len = smb_len(buf_out) + 4;
  56
  57         while (nwritten < len) {
  58                 ret = write_data(fd,buf_out+nwritten,len - nwritten);
  59                 if (ret <= 0) {
  60                         DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
  61                                 (int)len,(int)ret, strerror(errno) ));
  62                         srv_free_enc_buffer(buf_out);
  63                         return false;
  64                 }
  65                 nwritten += ret;
  66         }
  67
  68         srv_free_enc_buffer(buf_out);
  69         return true;
  70 }
  71
  72 /*******************************************************************
  73  Setup the word count and byte count for a smb message.
  74 ********************************************************************/
  75
  76 int srv_set_message(char *buf,
  77                         int num_words,
  78                         int num_bytes,
  79                         bool zero)
  80 {
  81         if (zero && (num_words || num_bytes)) {
  82                 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
  83         }
  84         SCVAL(buf,smb_wct,num_words);
  85         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
  86         smb_setlen(buf,(smb_size + num_words*2 + num_bytes - 4));
  87         return (smb_size + num_words*2 + num_bytes);
  88 }
  89
  90 static bool valid_smb_header(const uint8_t *inbuf)
  91 {
  92         if (is_encrypted_packet(inbuf)) {
  93                 return true;
  94         }
  95         /*
  96          * This used to be (strncmp(smb_base(inbuf),"\377SMB",4) == 0)
  97          * but it just looks weird to call strncmp for this one.
  98          */
  99         return (IVAL(smb_base(inbuf), 0) == 0x424D53FF);
 100 }
 101
 102 /* Socket functions for smbd packet processing. */
 103
 104 static bool valid_packet_size(size_t len)
 105 {
 106         /*
 107          * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
 108          * of header. Don't print the error if this fits.... JRA.
 109          */
 110
 111         if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
 112                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 113                                         (unsigned long)len));
 114                 return false;
 115         }
 116         return true;
 117 }
 118
 119 static NTSTATUS read_packet_remainder(int fd, char *buffer,
 120                                       unsigned int timeout, ssize_t len)
 121 {
 122         if (len <= 0) {
 123                 return NT_STATUS_OK;
 124         }
 125
 126         return read_socket_with_timeout(fd, buffer, len, len, timeout, NULL);
 127 }
 128
 129 /****************************************************************************
 130  Attempt a zerocopy writeX read. We know here that len > smb_size-4
 131 ****************************************************************************/
 132
 133 /*
 134  * Unfortunately, earlier versions of smbclient/libsmbclient
 135  * don't send this "standard" writeX header. I've fixed this
 136  * for 3.2 but we'll use the old method with earlier versions.
 137  * Windows and CIFSFS at least use this standard size. Not
 138  * sure about MacOSX.
 139  */
 140
 141 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
 142                                 (2*14) + /* word count (including bcc) */ \
 143                                 1 /* pad byte */)
 144
 145 static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
 146                                                     const char lenbuf[4],
 147                                                     int fd, char **buffer,
 148                                                     unsigned int timeout,
 149                                                     size_t *p_unread,
 150                                                     size_t *len_ret)
 151 {
 152         /* Size of a WRITEX call (+4 byte len). */
 153         char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
 154         ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
 155         ssize_t toread;
 156         NTSTATUS status;
 157
 158         memcpy(writeX_header, lenbuf, 4);
 159
 160         status = read_socket_with_timeout(
 161                 fd, writeX_header + 4,
 162                 STANDARD_WRITE_AND_X_HEADER_SIZE,
 163                 STANDARD_WRITE_AND_X_HEADER_SIZE,
 164                 timeout, NULL);
 165
 166         if (!NT_STATUS_IS_OK(status)) {
 167                 return status;
 168         }
 169
 170         /*
 171          * Ok - now try and see if this is a possible
 172          * valid writeX call.
 173          */
 174
 175         if (is_valid_writeX_buffer((uint8_t *)writeX_header)) {
 176                 /*
 177                  * If the data offset is beyond what
 178                  * we've read, drain the extra bytes.
 179                  */
 180                 uint16_t doff = SVAL(writeX_header,smb_vwv11);
 181                 ssize_t newlen;
 182
 183                 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
 184                         size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
 185                         if (drain_socket(smbd_server_fd(), drain) != drain) {
 186                                 smb_panic("receive_smb_raw_talloc_partial_read:"
 187                                         " failed to drain pending bytes");
 188                         }
 189                 } else {
 190                         doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
 191                 }
 192
 193                 /* Spoof down the length and null out the bcc. */
 194                 set_message_bcc(writeX_header, 0);
 195                 newlen = smb_len(writeX_header);
 196
 197                 /* Copy the header we've written. */
 198
 199                 *buffer = (char *)TALLOC_MEMDUP(mem_ctx,
 200                                 writeX_header,
 201                                 sizeof(writeX_header));
 202
 203                 if (*buffer == NULL) {
 204                         DEBUG(0, ("Could not allocate inbuf of length %d\n",
 205                                   (int)sizeof(writeX_header)));
 206                         return NT_STATUS_NO_MEMORY;
 207                 }
 208
 209                 /* Work out the remaining bytes. */
 210                 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
 211                 *len_ret = newlen + 4;
 212                 return NT_STATUS_OK;
 213         }
 214
 215         if (!valid_packet_size(len)) {
 216                 return NT_STATUS_INVALID_PARAMETER;
 217         }
 218
 219         /*
 220          * Not a valid writeX call. Just do the standard
 221          * talloc and return.
 222          */
 223
 224         *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
 225
 226         if (*buffer == NULL) {
 227                 DEBUG(0, ("Could not allocate inbuf of length %d\n",
 228                           (int)len+4));
 229                 return NT_STATUS_NO_MEMORY;
 230         }
 231
 232         /* Copy in what we already read. */
 233         memcpy(*buffer,
 234                 writeX_header,
 235                 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
 236         toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
 237
 238         if(toread > 0) {
 239                 status = read_packet_remainder(
 240                         fd, (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
 241                         timeout, toread);
 242
 243                 if (!NT_STATUS_IS_OK(status)) {
 244                         DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
 245                                    nt_errstr(status)));
 246                         return status;
 247                 }
 248         }
 249
 250         *len_ret = len + 4;
 251         return NT_STATUS_OK;
 252 }
 253
 254 static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx, int fd,
 255                                        char **buffer, unsigned int timeout,
 256                                        size_t *p_unread, size_t *plen)
 257 {
 258         char lenbuf[4];
 259         size_t len;
 260         int min_recv_size = lp_min_receive_file_size();
 261         NTSTATUS status;
 262
 263         *p_unread = 0;
 264
 265         status = read_smb_length_return_keepalive(fd, lenbuf, timeout, &len);
 266         if (!NT_STATUS_IS_OK(status)) {
 267                 DEBUG(10, ("receive_smb_raw: %s\n", nt_errstr(status)));
 268                 return status;
 269         }
 270
 271         if (CVAL(lenbuf,0) == 0 &&
 272                         min_recv_size &&
 273                         smb_len_large(lenbuf) > (min_recv_size + STANDARD_WRITE_AND_X_HEADER_SIZE) && /* Could be a UNIX large writeX. */
 274                         !srv_is_signing_active()) {
 275
 276                 return receive_smb_raw_talloc_partial_read(
 277                         mem_ctx, lenbuf, fd, buffer, timeout, p_unread, plen);
 278         }
 279
 280         if (!valid_packet_size(len)) {
 281                 return NT_STATUS_INVALID_PARAMETER;
 282         }
 283
 284         /*
 285          * The +4 here can't wrap, we've checked the length above already.
 286          */
 287
 288         *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
 289
 290         if (*buffer == NULL) {
 291                 DEBUG(0, ("Could not allocate inbuf of length %d\n",
 292                           (int)len+4));
 293                 return NT_STATUS_NO_MEMORY;
 294         }
 295
 296         memcpy(*buffer, lenbuf, sizeof(lenbuf));
 297
 298         status = read_packet_remainder(fd, (*buffer)+4, timeout, len);
 299         if (!NT_STATUS_IS_OK(status)) {
 300                 return status;
 301         }
 302
 303         *plen = len + 4;
 304         return NT_STATUS_OK;
 305 }
 306
 307 static NTSTATUS receive_smb_talloc(TALLOC_CTX *mem_ctx, int fd,
 308                                    char **buffer, unsigned int timeout,
 309                                    size_t *p_unread, bool *p_encrypted,
 310                                    size_t *p_len)
 311 {
 312         size_t len = 0;
 313         NTSTATUS status;
 314
 315         *p_encrypted = false;
 316
 317         status = receive_smb_raw_talloc(mem_ctx, fd, buffer, timeout,
 318                                         p_unread, &len);
 319         if (!NT_STATUS_IS_OK(status)) {
 320                 return status;
 321         }
 322
 323         if (is_encrypted_packet((uint8_t *)*buffer)) {
 324                 status = srv_decrypt_buffer(*buffer);
 325                 if (!NT_STATUS_IS_OK(status)) {
 326                         DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
 327                                 "incoming packet! Error %s\n",
 328                                 nt_errstr(status) ));
 329                         return status;
 330                 }
 331                 *p_encrypted = true;
 332         }
 333
 334         /* Check the incoming SMB signature. */
 335         if (!srv_check_sign_mac(*buffer, true)) {
 336                 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
 337                           "incoming packet!\n"));
 338                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 339         }
 340
 341         *p_len = len;
 342         return NT_STATUS_OK;
 343 }
 344
 345 /*
 346  * Initialize a struct smb_request from an inbuf
 347  */
 348
 349 void init_smb_request(struct smb_request *req,
 350                         const uint8 *inbuf,
 351                         size_t unread_bytes,
 352                         bool encrypted)
 353 {
 354         size_t req_size = smb_len(inbuf) + 4;
 355         /* Ensure we have at least smb_size bytes. */
 356         if (req_size < smb_size) {
 357                 DEBUG(0,("init_smb_request: invalid request size %u\n",
 358                         (unsigned int)req_size ));
 359                 exit_server_cleanly("Invalid SMB request");
 360         }
 361         req->cmd    = CVAL(inbuf, smb_com);
 362         req->flags2 = SVAL(inbuf, smb_flg2);
 363         req->smbpid = SVAL(inbuf, smb_pid);
 364         req->mid    = SVAL(inbuf, smb_mid);
 365         req->vuid   = SVAL(inbuf, smb_uid);
 366         req->tid    = SVAL(inbuf, smb_tid);
 367         req->wct    = CVAL(inbuf, smb_wct);
 368         req->vwv    = (uint16_t *)(inbuf+smb_vwv);
 369         req->buflen = smb_buflen(inbuf);
 370         req->buf    = (const uint8_t *)smb_buf(inbuf);
 371         req->unread_bytes = unread_bytes;
 372         req->encrypted = encrypted;
 373         req->conn = conn_find(req->tid);
 374         req->chain_fsp = NULL;
 375         req->chain_outbuf = NULL;
 376
 377         /* Ensure we have at least wct words and 2 bytes of bcc. */
 378         if (smb_size + req->wct*2 > req_size) {
 379                 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
 380                         (unsigned int)req->wct,
 381                         (unsigned int)req_size));
 382                 exit_server_cleanly("Invalid SMB request");
 383         }
 384         /* Ensure bcc is correct. */
 385         if (((uint8 *)smb_buf(inbuf)) + req->buflen > inbuf + req_size) {
 386                 DEBUG(0,("init_smb_request: invalid bcc number %u "
 387                         "(wct = %u, size %u)\n",
 388                         (unsigned int)req->buflen,
 389                         (unsigned int)req->wct,
 390                         (unsigned int)req_size));
 391                 exit_server_cleanly("Invalid SMB request");
 392         }
 393         req->outbuf = NULL;
 394 }
 395
 396 static void process_smb(struct smbd_server_connection *conn,
 397                         uint8_t *inbuf, size_t nread, size_t unread_bytes,
 398                         bool encrypted);
 399
 400 static void smbd_deferred_open_timer(struct event_context *ev,
 401                                      struct timed_event *te,
 402                                      struct timeval _tval,
 403                                      void *private_data)
 404 {
 405         struct pending_message_list *msg = talloc_get_type(private_data,
 406                                            struct pending_message_list);
 407         TALLOC_CTX *mem_ctx = talloc_tos();
 408         uint8_t *inbuf;
 409
 410         inbuf = (uint8_t *)talloc_memdup(mem_ctx, msg->buf.data,
 411                                          msg->buf.length);
 412         if (inbuf == NULL) {
 413                 exit_server("smbd_deferred_open_timer: talloc failed\n");
 414                 return;
 415         }
 416
 417         /* We leave this message on the queue so the open code can
 418            know this is a retry. */
 419         DEBUG(5,("smbd_deferred_open_timer: trigger mid %u.\n",
 420                 (unsigned int)SVAL(msg->buf.data,smb_mid)));
 421
 422         process_smb(smbd_server_conn, inbuf,
 423                     msg->buf.length, 0,
 424                     msg->encrypted);
 425 }
 426
 427 /****************************************************************************
 428  Function to push a message onto the tail of a linked list of smb messages ready
 429  for processing.
 430 ****************************************************************************/
 431
 432 static bool push_queued_message(struct smb_request *req,
 433                                 struct timeval request_time,
 434                                 struct timeval end_time,
 435                                 char *private_data, size_t private_len)
 436 {
 437         int msg_len = smb_len(req->inbuf) + 4;
 438         struct pending_message_list *msg;
 439
 440         msg = TALLOC_ZERO_P(NULL, struct pending_message_list);
 441
 442         if(msg == NULL) {
 443                 DEBUG(0,("push_message: malloc fail (1)\n"));
 444                 return False;
 445         }
 446
 447         msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
 448         if(msg->buf.data == NULL) {
 449                 DEBUG(0,("push_message: malloc fail (2)\n"));
 450                 TALLOC_FREE(msg);
 451                 return False;
 452         }
 453
 454         msg->request_time = request_time;
 455         msg->encrypted = req->encrypted;
 456
 457         if (private_data) {
 458                 msg->private_data = data_blob_talloc(msg, private_data,
 459                                                      private_len);
 460                 if (msg->private_data.data == NULL) {
 461                         DEBUG(0,("push_message: malloc fail (3)\n"));
 462                         TALLOC_FREE(msg);
 463                         return False;
 464                 }
 465         }
 466
 467         msg->te = event_add_timed(smbd_event_context(),
 468                                   msg,
 469                                   end_time,
 470                                   smbd_deferred_open_timer,
 471                                   msg);
 472         if (!msg->te) {
 473                 DEBUG(0,("push_message: event_add_timed failed\n"));
 474                 TALLOC_FREE(msg);
 475                 return false;
 476         }
 477
 478         DLIST_ADD_END(deferred_open_queue, msg, struct pending_message_list *);
 479
 480         DEBUG(10,("push_message: pushed message length %u on "
 481                   "deferred_open_queue\n", (unsigned int)msg_len));
 482
 483         return True;
 484 }
 485
 486 /****************************************************************************
 487  Function to delete a sharing violation open message by mid.
 488 ****************************************************************************/
 489
 490 void remove_deferred_open_smb_message(uint16 mid)
 491 {
 492         struct pending_message_list *pml;
 493
 494         for (pml = deferred_open_queue; pml; pml = pml->next) {
 495                 if (mid == SVAL(pml->buf.data,smb_mid)) {
 496                         DEBUG(10,("remove_sharing_violation_open_smb_message: "
 497                                   "deleting mid %u len %u\n",
 498                                   (unsigned int)mid,
 499                                   (unsigned int)pml->buf.length ));
 500                         DLIST_REMOVE(deferred_open_queue, pml);
 501                         TALLOC_FREE(pml);
 502                         return;
 503                 }
 504         }
 505 }
 506
 507 /****************************************************************************
 508  Move a sharing violation open retry message to the front of the list and
 509  schedule it for immediate processing.
 510 ****************************************************************************/
 511
 512 void schedule_deferred_open_smb_message(uint16 mid)
 513 {
 514         struct pending_message_list *pml;
 515         int i = 0;
 516
 517         for (pml = deferred_open_queue; pml; pml = pml->next) {
 518                 uint16 msg_mid = SVAL(pml->buf.data,smb_mid);
 519
 520                 DEBUG(10,("schedule_deferred_open_smb_message: [%d] msg_mid = %u\n", i++,
 521                         (unsigned int)msg_mid ));
 522
 523                 if (mid == msg_mid) {
 524                         struct timed_event *te;
 525
 526                         DEBUG(10,("schedule_deferred_open_smb_message: scheduling mid %u\n",
 527                                 mid ));
 528
 529                         te = event_add_timed(smbd_event_context(),
 530                                              pml,
 531                                              timeval_zero(),
 532                                              smbd_deferred_open_timer,
 533                                              pml);
 534                         if (!te) {
 535                                 DEBUG(10,("schedule_deferred_open_smb_message: "
 536                                           "event_add_timed() failed, skipping mid %u\n",
 537                                           mid ));
 538                         }
 539
 540                         TALLOC_FREE(pml->te);
 541                         pml->te = te;
 542                         DLIST_PROMOTE(deferred_open_queue, pml);
 543                         return;
 544                 }
 545         }
 546
 547         DEBUG(10,("schedule_deferred_open_smb_message: failed to find message mid %u\n",
 548                 mid ));
 549 }
 550
 551 /****************************************************************************
 552  Return true if this mid is on the deferred queue.
 553 ****************************************************************************/
 554
 555 bool open_was_deferred(uint16 mid)
 556 {
 557         struct pending_message_list *pml;
 558
 559         for (pml = deferred_open_queue; pml; pml = pml->next) {
 560                 if (SVAL(pml->buf.data,smb_mid) == mid) {
 561                         return True;
 562                 }
 563         }
 564         return False;
 565 }
 566
 567 /****************************************************************************
 568  Return the message queued by this mid.
 569 ****************************************************************************/
 570
 571 struct pending_message_list *get_open_deferred_message(uint16 mid)
 572 {
 573         struct pending_message_list *pml;
 574
 575         for (pml = deferred_open_queue; pml; pml = pml->next) {
 576                 if (SVAL(pml->buf.data,smb_mid) == mid) {
 577                         return pml;
 578                 }
 579         }
 580         return NULL;
 581 }
 582
 583 /****************************************************************************
 584  Function to push a deferred open smb message onto a linked list of local smb
 585  messages ready for processing.
 586 ****************************************************************************/
 587
 588 bool push_deferred_smb_message(struct smb_request *req,
 589                                struct timeval request_time,
 590                                struct timeval timeout,
 591                                char *private_data, size_t priv_len)
 592 {
 593         struct timeval end_time;
 594
 595         if (req->unread_bytes) {
 596                 DEBUG(0,("push_deferred_smb_message: logic error ! "
 597                         "unread_bytes = %u\n",
 598                         (unsigned int)req->unread_bytes ));
 599                 smb_panic("push_deferred_smb_message: "
 600                         "logic error unread_bytes != 0" );
 601         }
 602
 603         end_time = timeval_sum(&request_time, &timeout);
 604
 605         DEBUG(10,("push_deferred_open_smb_message: pushing message len %u mid %u "
 606                   "timeout time [%u.%06u]\n",
 607                   (unsigned int) smb_len(req->inbuf)+4, (unsigned int)req->mid,
 608                   (unsigned int)end_time.tv_sec,
 609                   (unsigned int)end_time.tv_usec));
 610
 611         return push_queued_message(req, request_time, end_time,
 612                                    private_data, priv_len);
 613 }
 614
 615 struct idle_event {
 616         struct timed_event *te;
 617         struct timeval interval;
 618         char *name;
 619         bool (*handler)(const struct timeval *now, void *private_data);
 620         void *private_data;
 621 };
 622
 623 static void smbd_idle_event_handler(struct event_context *ctx,
 624                                     struct timed_event *te,
 625                                     struct timeval now,
 626                                     void *private_data)
 627 {
 628         struct idle_event *event =
 629                 talloc_get_type_abort(private_data, struct idle_event);
 630
 631         TALLOC_FREE(event->te);
 632
 633         DEBUG(10,("smbd_idle_event_handler: %s %p called\n",
 634                   event->name, event->te));
 635
 636         if (!event->handler(&now, event->private_data)) {
 637                 DEBUG(10,("smbd_idle_event_handler: %s %p stopped\n",
 638                           event->name, event->te));
 639                 /* Don't repeat, delete ourselves */
 640                 TALLOC_FREE(event);
 641                 return;
 642         }
 643
 644         DEBUG(10,("smbd_idle_event_handler: %s %p rescheduled\n",
 645                   event->name, event->te));
 646
 647         event->te = event_add_timed(ctx, event,
 648                                     timeval_sum(&now, &event->interval),
 649                                     smbd_idle_event_handler, event);
 650
 651         /* We can't do much but fail here. */
 652         SMB_ASSERT(event->te != NULL);
 653 }
 654
 655 struct idle_event *event_add_idle(struct event_context *event_ctx,
 656                                   TALLOC_CTX *mem_ctx,
 657                                   struct timeval interval,
 658                                   const char *name,
 659                                   bool (*handler)(const struct timeval *now,
 660                                                   void *private_data),
 661                                   void *private_data)
 662 {
 663         struct idle_event *result;
 664         struct timeval now = timeval_current();
 665
 666         result = TALLOC_P(mem_ctx, struct idle_event);
 667         if (result == NULL) {
 668                 DEBUG(0, ("talloc failed\n"));
 669                 return NULL;
 670         }
 671
 672         result->interval = interval;
 673         result->handler = handler;
 674         result->private_data = private_data;
 675
 676         if (!(result->name = talloc_asprintf(result, "idle_evt(%s)", name))) {
 677                 DEBUG(0, ("talloc failed\n"));
 678                 TALLOC_FREE(result);
 679                 return NULL;
 680         }
 681
 682         result->te = event_add_timed(event_ctx, result,
 683                                      timeval_sum(&now, &interval),
 684                                      smbd_idle_event_handler, result);
 685         if (result->te == NULL) {
 686                 DEBUG(0, ("event_add_timed failed\n"));
 687                 TALLOC_FREE(result);
 688                 return NULL;
 689         }
 690
 691         DEBUG(10,("event_add_idle: %s %p\n", result->name, result->te));
 692         return result;
 693 }
 694
 695 static void smbd_sig_term_handler(struct tevent_context *ev,
 696                                   struct tevent_signal *se,
 697                                   int signum,
 698                                   int count,
 699                                   void *siginfo,
 700                                   void *private_data)
 701 {
 702         exit_server_cleanly("termination signal");
 703 }
 704
 705 void smbd_setup_sig_term_handler(void)
 706 {
 707         struct tevent_signal *se;
 708
 709         se = tevent_add_signal(smbd_event_context(),
 710                                smbd_event_context(),
 711                                SIGTERM, 0,
 712                                smbd_sig_term_handler,
 713                                NULL);
 714         if (!se) {
 715                 exit_server("failed to setup SIGTERM handler");
 716         }
 717 }
 718
 719 static void smbd_sig_hup_handler(struct tevent_context *ev,
 720                                   struct tevent_signal *se,
 721                                   int signum,
 722                                   int count,
 723                                   void *siginfo,
 724                                   void *private_data)
 725 {
 726         change_to_root_user();
 727         DEBUG(1,("Reloading services after SIGHUP\n"));
 728         reload_services(False);
 729 }
 730
 731 void smbd_setup_sig_hup_handler(void)
 732 {
 733         struct tevent_signal *se;
 734
 735         se = tevent_add_signal(smbd_event_context(),
 736                                smbd_event_context(),
 737                                SIGHUP, 0,
 738                                smbd_sig_hup_handler,
 739                                NULL);
 740         if (!se) {
 741                 exit_server("failed to setup SIGHUP handler");
 742         }
 743 }
 744
 745 /****************************************************************************
 746  Do all async processing in here. This includes kernel oplock messages, change
 747  notify events etc.
 748 ****************************************************************************/
 749
 750 static void async_processing(void)
 751 {
 752         DEBUG(10,("async_processing: Doing async processing.\n"));
 753
 754         process_aio_queue();
 755
 756         process_kernel_oplocks(smbd_messaging_context());
 757
 758         /* Do the aio check again after receive_local_message as it does a
 759            select and may have eaten our signal. */
 760         /* Is this till true? -- vl */
 761         process_aio_queue();
 762 }
 763
 764 /****************************************************************************
 765   Do a select on an two fd's - with timeout.
 766
 767   If a local udp message has been pushed onto the
 768   queue (this can only happen during oplock break
 769   processing) call async_processing()
 770
 771   If a pending smb message has been pushed onto the
 772   queue (this can only happen during oplock break
 773   processing) return this next.
 774
 775   If the first smbfd is ready then read an smb from it.
 776   if the second (loopback UDP) fd is ready then read a message
 777   from it and setup the buffer header to identify the length
 778   and from address.
 779   Returns False on timeout or error.
 780   Else returns True.
 781
 782 The timeout is in milliseconds
 783 ****************************************************************************/
 784
 785 static NTSTATUS smbd_server_connection_loop_once(struct smbd_server_connection *conn)
 786 {
 787         fd_set r_fds, w_fds;
 788         int selrtn;
 789         struct timeval to;
 790         int maxfd = 0;
 791
 792         to.tv_sec = SMBD_SELECT_TIMEOUT;
 793         to.tv_usec = 0;
 794
 795         /*
 796          * Setup the select fd sets.
 797          */
 798
 799         FD_ZERO(&r_fds);
 800         FD_ZERO(&w_fds);
 801
 802         /*
 803          * Ensure we process oplock break messages by preference.
 804          * We have to do this before the select, after the select
 805          * and if the select returns EINTR. This is due to the fact
 806          * that the selects called from async_processing can eat an EINTR
 807          * caused by a signal (we can't take the break message there).
 808          * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
 809          */
 810
 811         if (oplock_message_waiting()) {
 812                 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
 813                 async_processing();
 814                 /*
 815                  * After async processing we must go and do the select again, as
 816                  * the state of the flag in fds for the server file descriptor is
 817                  * indeterminate - we may have done I/O on it in the oplock processing. JRA.
 818                  */
 819                 return NT_STATUS_RETRY;
 820         }
 821
 822         /*
 823          * Are there any timed events waiting ? If so, ensure we don't
 824          * select for longer than it would take to wait for them.
 825          */
 826
 827         {
 828                 struct timeval now;
 829                 GetTimeOfDay(&now);
 830
 831                 event_add_to_select_args(smbd_event_context(), &now,
 832                                          &r_fds, &w_fds, &to, &maxfd);
 833         }
 834
 835         /* Process a signal and timed events now... */
 836         if (run_events(smbd_event_context(), 0, NULL, NULL)) {
 837                 return NT_STATUS_RETRY;
 838         }
 839
 840         {
 841                 int sav;
 842                 START_PROFILE(smbd_idle);
 843
 844                 selrtn = sys_select(maxfd+1,&r_fds,&w_fds,NULL,&to);
 845                 sav = errno;
 846
 847                 END_PROFILE(smbd_idle);
 848                 errno = sav;
 849         }
 850
 851         if (run_events(smbd_event_context(), selrtn, &r_fds, &w_fds)) {
 852                 return NT_STATUS_RETRY;
 853         }
 854
 855         /* if we get EINTR then maybe we have received an oplock
 856            signal - treat this as select returning 1. This is ugly, but
 857            is the best we can do until the oplock code knows more about
 858            signals */
 859         if (selrtn == -1 && errno == EINTR) {
 860                 async_processing();
 861                 /*
 862                  * After async processing we must go and do the select again, as
 863                  * the state of the flag in fds for the server file descriptor is
 864                  * indeterminate - we may have done I/O on it in the oplock processing. JRA.
 865                  */
 866                 return NT_STATUS_RETRY;
 867         }
 868
 869         /* Check if error */
 870         if (selrtn == -1) {
 871                 /* something is wrong. Maybe the socket is dead? */
 872                 return map_nt_error_from_unix(errno);
 873         }
 874
 875         /* Did we timeout ? */
 876         if (selrtn == 0) {
 877                 return NT_STATUS_RETRY;
 878         }
 879
 880         /* should not be reached */
 881         return NT_STATUS_INTERNAL_ERROR;
 882 }
 883
 884 /*
 885  * Only allow 5 outstanding trans requests. We're allocating memory, so
 886  * prevent a DoS.
 887  */
 888
 889 NTSTATUS allow_new_trans(struct trans_state *list, int mid)
 890 {
 891         int count = 0;
 892         for (; list != NULL; list = list->next) {
 893
 894                 if (list->mid == mid) {
 895                         return NT_STATUS_INVALID_PARAMETER;
 896                 }
 897
 898                 count += 1;
 899         }
 900         if (count > 5) {
 901                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 902         }
 903
 904         return NT_STATUS_OK;
 905 }
 906
 907 /*
 908 These flags determine some of the permissions required to do an operation
 909
 910 Note that I don't set NEED_WRITE on some write operations because they
 911 are used by some brain-dead clients when printing, and I don't want to
 912 force write permissions on print services.
 913 */
 914 #define AS_USER (1<<0)
 915 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
 916 #define TIME_INIT (1<<2)
 917 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
 918 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
 919 #define DO_CHDIR (1<<6)
 920
 921 /*
 922    define a list of possible SMB messages and their corresponding
 923    functions. Any message that has a NULL function is unimplemented -
 924    please feel free to contribute implementations!
 925 */
 926 static const struct smb_message_struct {
 927         const char *name;
 928         void (*fn)(struct smb_request *req);
 929         int flags;
 930 } smb_messages[256] = {
 931
 932 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
 933 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
 934 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
 935 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
 936 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
 937 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
 938 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
 939 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
 940 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
 941 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
 942 /* 0x0a */ { "SMBread",reply_read,AS_USER},
 943 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
 944 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
 945 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
 946 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
 947 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
 948 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
 949 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
 950 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
 951 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
 952 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
 953 /* 0x15 */ { NULL, NULL, 0 },
 954 /* 0x16 */ { NULL, NULL, 0 },
 955 /* 0x17 */ { NULL, NULL, 0 },
 956 /* 0x18 */ { NULL, NULL, 0 },
 957 /* 0x19 */ { NULL, NULL, 0 },
 958 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
 959 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
 960 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
 961 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
 962 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
 963 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
 964 /* 0x20 */ { "SMBwritec", NULL,0},
 965 /* 0x21 */ { NULL, NULL, 0 },
 966 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
 967 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
 968 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
 969 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
 970 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
 971 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
 972 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
 973 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
 974 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
 975 /* 0x2b */ { "SMBecho",reply_echo,0},
 976 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
 977 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
 978 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
 979 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
 980 /* 0x30 */ { NULL, NULL, 0 },
 981 /* 0x31 */ { NULL, NULL, 0 },
 982 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
 983 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER},
 984 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
 985 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
 986 /* 0x36 */ { NULL, NULL, 0 },
 987 /* 0x37 */ { NULL, NULL, 0 },
 988 /* 0x38 */ { NULL, NULL, 0 },
 989 /* 0x39 */ { NULL, NULL, 0 },
 990 /* 0x3a */ { NULL, NULL, 0 },
 991 /* 0x3b */ { NULL, NULL, 0 },
 992 /* 0x3c */ { NULL, NULL, 0 },
 993 /* 0x3d */ { NULL, NULL, 0 },
 994 /* 0x3e */ { NULL, NULL, 0 },
 995 /* 0x3f */ { NULL, NULL, 0 },
 996 /* 0x40 */ { NULL, NULL, 0 },
 997 /* 0x41 */ { NULL, NULL, 0 },
 998 /* 0x42 */ { NULL, NULL, 0 },
 999 /* 0x43 */ { NULL, NULL, 0 },
1000 /* 0x44 */ { NULL, NULL, 0 },
1001 /* 0x45 */ { NULL, NULL, 0 },
1002 /* 0x46 */ { NULL, NULL, 0 },
1003 /* 0x47 */ { NULL, NULL, 0 },
1004 /* 0x48 */ { NULL, NULL, 0 },
1005 /* 0x49 */ { NULL, NULL, 0 },
1006 /* 0x4a */ { NULL, NULL, 0 },
1007 /* 0x4b */ { NULL, NULL, 0 },
1008 /* 0x4c */ { NULL, NULL, 0 },
1009 /* 0x4d */ { NULL, NULL, 0 },
1010 /* 0x4e */ { NULL, NULL, 0 },
1011 /* 0x4f */ { NULL, NULL, 0 },
1012 /* 0x50 */ { NULL, NULL, 0 },
1013 /* 0x51 */ { NULL, NULL, 0 },
1014 /* 0x52 */ { NULL, NULL, 0 },
1015 /* 0x53 */ { NULL, NULL, 0 },
1016 /* 0x54 */ { NULL, NULL, 0 },
1017 /* 0x55 */ { NULL, NULL, 0 },
1018 /* 0x56 */ { NULL, NULL, 0 },
1019 /* 0x57 */ { NULL, NULL, 0 },
1020 /* 0x58 */ { NULL, NULL, 0 },
1021 /* 0x59 */ { NULL, NULL, 0 },
1022 /* 0x5a */ { NULL, NULL, 0 },
1023 /* 0x5b */ { NULL, NULL, 0 },
1024 /* 0x5c */ { NULL, NULL, 0 },
1025 /* 0x5d */ { NULL, NULL, 0 },
1026 /* 0x5e */ { NULL, NULL, 0 },
1027 /* 0x5f */ { NULL, NULL, 0 },
1028 /* 0x60 */ { NULL, NULL, 0 },
1029 /* 0x61 */ { NULL, NULL, 0 },
1030 /* 0x62 */ { NULL, NULL, 0 },
1031 /* 0x63 */ { NULL, NULL, 0 },
1032 /* 0x64 */ { NULL, NULL, 0 },
1033 /* 0x65 */ { NULL, NULL, 0 },
1034 /* 0x66 */ { NULL, NULL, 0 },
1035 /* 0x67 */ { NULL, NULL, 0 },
1036 /* 0x68 */ { NULL, NULL, 0 },
1037 /* 0x69 */ { NULL, NULL, 0 },
1038 /* 0x6a */ { NULL, NULL, 0 },
1039 /* 0x6b */ { NULL, NULL, 0 },
1040 /* 0x6c */ { NULL, NULL, 0 },
1041 /* 0x6d */ { NULL, NULL, 0 },
1042 /* 0x6e */ { NULL, NULL, 0 },
1043 /* 0x6f */ { NULL, NULL, 0 },
1044 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1045 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1046 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1047 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1048 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1049 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1050 /* 0x76 */ { NULL, NULL, 0 },
1051 /* 0x77 */ { NULL, NULL, 0 },
1052 /* 0x78 */ { NULL, NULL, 0 },
1053 /* 0x79 */ { NULL, NULL, 0 },
1054 /* 0x7a */ { NULL, NULL, 0 },
1055 /* 0x7b */ { NULL, NULL, 0 },
1056 /* 0x7c */ { NULL, NULL, 0 },
1057 /* 0x7d */ { NULL, NULL, 0 },
1058 /* 0x7e */ { NULL, NULL, 0 },
1059 /* 0x7f */ { NULL, NULL, 0 },
1060 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1061 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1062 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1063 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1064 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1065 /* 0x85 */ { NULL, NULL, 0 },
1066 /* 0x86 */ { NULL, NULL, 0 },
1067 /* 0x87 */ { NULL, NULL, 0 },
1068 /* 0x88 */ { NULL, NULL, 0 },
1069 /* 0x89 */ { NULL, NULL, 0 },
1070 /* 0x8a */ { NULL, NULL, 0 },
1071 /* 0x8b */ { NULL, NULL, 0 },
1072 /* 0x8c */ { NULL, NULL, 0 },
1073 /* 0x8d */ { NULL, NULL, 0 },
1074 /* 0x8e */ { NULL, NULL, 0 },
1075 /* 0x8f */ { NULL, NULL, 0 },
1076 /* 0x90 */ { NULL, NULL, 0 },
1077 /* 0x91 */ { NULL, NULL, 0 },
1078 /* 0x92 */ { NULL, NULL, 0 },
1079 /* 0x93 */ { NULL, NULL, 0 },
1080 /* 0x94 */ { NULL, NULL, 0 },
1081 /* 0x95 */ { NULL, NULL, 0 },
1082 /* 0x96 */ { NULL, NULL, 0 },
1083 /* 0x97 */ { NULL, NULL, 0 },
1084 /* 0x98 */ { NULL, NULL, 0 },
1085 /* 0x99 */ { NULL, NULL, 0 },
1086 /* 0x9a */ { NULL, NULL, 0 },
1087 /* 0x9b */ { NULL, NULL, 0 },
1088 /* 0x9c */ { NULL, NULL, 0 },
1089 /* 0x9d */ { NULL, NULL, 0 },
1090 /* 0x9e */ { NULL, NULL, 0 },
1091 /* 0x9f */ { NULL, NULL, 0 },
1092 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1093 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1094 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1095 /* 0xa3 */ { NULL, NULL, 0 },
1096 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1097 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1098 /* 0xa6 */ { NULL, NULL, 0 },
1099 /* 0xa7 */ { NULL, NULL, 0 },
1100 /* 0xa8 */ { NULL, NULL, 0 },
1101 /* 0xa9 */ { NULL, NULL, 0 },
1102 /* 0xaa */ { NULL, NULL, 0 },
1103 /* 0xab */ { NULL, NULL, 0 },
1104 /* 0xac */ { NULL, NULL, 0 },
1105 /* 0xad */ { NULL, NULL, 0 },
1106 /* 0xae */ { NULL, NULL, 0 },
1107 /* 0xaf */ { NULL, NULL, 0 },
1108 /* 0xb0 */ { NULL, NULL, 0 },
1109 /* 0xb1 */ { NULL, NULL, 0 },
1110 /* 0xb2 */ { NULL, NULL, 0 },
1111 /* 0xb3 */ { NULL, NULL, 0 },
1112 /* 0xb4 */ { NULL, NULL, 0 },
1113 /* 0xb5 */ { NULL, NULL, 0 },
1114 /* 0xb6 */ { NULL, NULL, 0 },
1115 /* 0xb7 */ { NULL, NULL, 0 },
1116 /* 0xb8 */ { NULL, NULL, 0 },
1117 /* 0xb9 */ { NULL, NULL, 0 },
1118 /* 0xba */ { NULL, NULL, 0 },
1119 /* 0xbb */ { NULL, NULL, 0 },
1120 /* 0xbc */ { NULL, NULL, 0 },
1121 /* 0xbd */ { NULL, NULL, 0 },
1122 /* 0xbe */ { NULL, NULL, 0 },
1123 /* 0xbf */ { NULL, NULL, 0 },
1124 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1125 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1126 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1127 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1128 /* 0xc4 */ { NULL, NULL, 0 },
1129 /* 0xc5 */ { NULL, NULL, 0 },
1130 /* 0xc6 */ { NULL, NULL, 0 },
1131 /* 0xc7 */ { NULL, NULL, 0 },
1132 /* 0xc8 */ { NULL, NULL, 0 },
1133 /* 0xc9 */ { NULL, NULL, 0 },
1134 /* 0xca */ { NULL, NULL, 0 },
1135 /* 0xcb */ { NULL, NULL, 0 },
1136 /* 0xcc */ { NULL, NULL, 0 },
1137 /* 0xcd */ { NULL, NULL, 0 },
1138 /* 0xce */ { NULL, NULL, 0 },
1139 /* 0xcf */ { NULL, NULL, 0 },
1140 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1141 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1142 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1143 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1144 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1145 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1146 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1147 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1148 /* 0xd8 */ { NULL, NULL, 0 },
1149 /* 0xd9 */ { NULL, NULL, 0 },
1150 /* 0xda */ { NULL, NULL, 0 },
1151 /* 0xdb */ { NULL, NULL, 0 },
1152 /* 0xdc */ { NULL, NULL, 0 },
1153 /* 0xdd */ { NULL, NULL, 0 },
1154 /* 0xde */ { NULL, NULL, 0 },
1155 /* 0xdf */ { NULL, NULL, 0 },
1156 /* 0xe0 */ { NULL, NULL, 0 },
1157 /* 0xe1 */ { NULL, NULL, 0 },
1158 /* 0xe2 */ { NULL, NULL, 0 },
1159 /* 0xe3 */ { NULL, NULL, 0 },
1160 /* 0xe4 */ { NULL, NULL, 0 },
1161 /* 0xe5 */ { NULL, NULL, 0 },
1162 /* 0xe6 */ { NULL, NULL, 0 },
1163 /* 0xe7 */ { NULL, NULL, 0 },
1164 /* 0xe8 */ { NULL, NULL, 0 },
1165 /* 0xe9 */ { NULL, NULL, 0 },
1166 /* 0xea */ { NULL, NULL, 0 },
1167 /* 0xeb */ { NULL, NULL, 0 },
1168 /* 0xec */ { NULL, NULL, 0 },
1169 /* 0xed */ { NULL, NULL, 0 },
1170 /* 0xee */ { NULL, NULL, 0 },
1171 /* 0xef */ { NULL, NULL, 0 },
1172 /* 0xf0 */ { NULL, NULL, 0 },
1173 /* 0xf1 */ { NULL, NULL, 0 },
1174 /* 0xf2 */ { NULL, NULL, 0 },
1175 /* 0xf3 */ { NULL, NULL, 0 },
1176 /* 0xf4 */ { NULL, NULL, 0 },
1177 /* 0xf5 */ { NULL, NULL, 0 },
1178 /* 0xf6 */ { NULL, NULL, 0 },
1179 /* 0xf7 */ { NULL, NULL, 0 },
1180 /* 0xf8 */ { NULL, NULL, 0 },
1181 /* 0xf9 */ { NULL, NULL, 0 },
1182 /* 0xfa */ { NULL, NULL, 0 },
1183 /* 0xfb */ { NULL, NULL, 0 },
1184 /* 0xfc */ { NULL, NULL, 0 },
1185 /* 0xfd */ { NULL, NULL, 0 },
1186 /* 0xfe */ { NULL, NULL, 0 },
1187 /* 0xff */ { NULL, NULL, 0 }
1188
1189 };
1190
1191 /*******************************************************************
1192  allocate and initialize a reply packet
1193 ********************************************************************/
1194
1195 static bool create_outbuf(TALLOC_CTX *mem_ctx, struct smb_request *req,
1196                           const char *inbuf, char **outbuf, uint8_t num_words,
1197                           uint32_t num_bytes)
1198 {
1199         /*
1200          * Protect against integer wrap
1201          */
1202         if ((num_bytes > 0xffffff)
1203             || ((num_bytes + smb_size + num_words*2) > 0xffffff)) {
1204                 char *msg;
1205                 if (asprintf(&msg, "num_bytes too large: %u",
1206                              (unsigned)num_bytes) == -1) {
1207                         msg = CONST_DISCARD(char *, "num_bytes too large");
1208                 }
1209                 smb_panic(msg);
1210         }
1211
1212         *outbuf = TALLOC_ARRAY(mem_ctx, char,
1213                                smb_size + num_words*2 + num_bytes);
1214         if (*outbuf == NULL) {
1215                 return false;
1216         }
1217
1218         construct_reply_common(req, inbuf, *outbuf);
1219         srv_set_message(*outbuf, num_words, num_bytes, false);
1220         /*
1221          * Zero out the word area, the caller has to take care of the bcc area
1222          * himself
1223          */
1224         if (num_words != 0) {
1225                 memset(*outbuf + smb_vwv0, 0, num_words*2);
1226         }
1227
1228         return true;
1229 }
1230
1231 void reply_outbuf(struct smb_request *req, uint8 num_words, uint32 num_bytes)
1232 {
1233         char *outbuf;
1234         if (!create_outbuf(req, req, (char *)req->inbuf, &outbuf, num_words,
1235                            num_bytes)) {
1236                 smb_panic("could not allocate output buffer\n");
1237         }
1238         req->outbuf = (uint8_t *)outbuf;
1239 }
1240
1241
1242 /*******************************************************************
1243  Dump a packet to a file.
1244 ********************************************************************/
1245
1246 static void smb_dump(const char *name, int type, const char *data, ssize_t len)
1247 {
1248         int fd, i;
1249         char *fname = NULL;
1250         if (DEBUGLEVEL < 50) {
1251                 return;
1252         }
1253
1254         if (len < 4) len = smb_len(data)+4;
1255         for (i=1;i<100;i++) {
1256                 if (asprintf(&fname, "/tmp/%s.%d.%s", name, i,
1257                              type ? "req" : "resp") == -1) {
1258                         return;
1259                 }
1260                 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1261                 if (fd != -1 || errno != EEXIST) break;
1262         }
1263         if (fd != -1) {
1264                 ssize_t ret = write(fd, data, len);
1265                 if (ret != len)
1266                         DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1267                 close(fd);
1268                 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1269         }
1270         SAFE_FREE(fname);
1271 }
1272
1273 /****************************************************************************
1274  Prepare everything for calling the actual request function, and potentially
1275  call the request function via the "new" interface.
1276
1277  Return False if the "legacy" function needs to be called, everything is
1278  prepared.
1279
1280  Return True if we're done.
1281
1282  I know this API sucks, but it is the one with the least code change I could
1283  find.
1284 ****************************************************************************/
1285
1286 static connection_struct *switch_message(uint8 type, struct smb_request *req, int size)
1287 {
1288         int flags;
1289         uint16 session_tag;
1290         connection_struct *conn = NULL;
1291
1292         errno = 0;
1293
1294         /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1295          * so subtract 4 from it. */
1296         if (!valid_smb_header(req->inbuf)
1297             || (size < (smb_size - 4))) {
1298                 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1299                          smb_len(req->inbuf)));
1300                 exit_server_cleanly("Non-SMB packet");
1301         }
1302
1303         if (smb_messages[type].fn == NULL) {
1304                 DEBUG(0,("Unknown message type %d!\n",type));
1305                 smb_dump("Unknown", 1, (char *)req->inbuf, size);
1306                 reply_unknown_new(req, type);
1307                 return NULL;
1308         }
1309
1310         flags = smb_messages[type].flags;
1311
1312         /* In share mode security we must ignore the vuid. */
1313         session_tag = (lp_security() == SEC_SHARE)
1314                 ? UID_FIELD_INVALID : req->vuid;
1315         conn = req->conn;
1316
1317         DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1318                  (int)sys_getpid(), (unsigned long)conn));
1319
1320         smb_dump(smb_fn_name(type), 1, (char *)req->inbuf, size);
1321
1322         /* Ensure this value is replaced in the incoming packet. */
1323         SSVAL(req->inbuf,smb_uid,session_tag);
1324
1325         /*
1326          * Ensure the correct username is in current_user_info.  This is a
1327          * really ugly bugfix for problems with multiple session_setup_and_X's
1328          * being done and allowing %U and %G substitutions to work correctly.
1329          * There is a reason this code is done here, don't move it unless you
1330          * know what you're doing... :-).
1331          * JRA.
1332          */
1333
1334         if (session_tag != last_session_tag) {
1335                 user_struct *vuser = NULL;
1336
1337                 last_session_tag = session_tag;
1338                 if(session_tag != UID_FIELD_INVALID) {
1339                         vuser = get_valid_user_struct(session_tag);
1340                         if (vuser) {
1341                                 set_current_user_info(
1342                                         vuser->server_info->sanitized_username,
1343                                         vuser->server_info->unix_name,
1344                                         pdb_get_domain(vuser->server_info
1345                                                        ->sam_account));
1346                         }
1347                 }
1348         }
1349
1350         /* Does this call need to be run as the connected user? */
1351         if (flags & AS_USER) {
1352
1353                 /* Does this call need a valid tree connection? */
1354                 if (!conn) {
1355                         /*
1356                          * Amazingly, the error code depends on the command
1357                          * (from Samba4).
1358                          */
1359                         if (type == SMBntcreateX) {
1360                                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1361                         } else {
1362                                 reply_doserror(req, ERRSRV, ERRinvnid);
1363                         }
1364                         return NULL;
1365                 }
1366
1367                 if (!change_to_user(conn,session_tag)) {
1368                         reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRbaduid));
1369                         remove_deferred_open_smb_message(req->mid);
1370                         return conn;
1371                 }
1372
1373                 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1374
1375                 /* Does it need write permission? */
1376                 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1377                         reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1378                         return conn;
1379                 }
1380
1381                 /* IPC services are limited */
1382                 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1383                         reply_doserror(req, ERRSRV,ERRaccess);
1384                         return conn;
1385                 }
1386         } else {
1387                 /* This call needs to be run as root */
1388                 change_to_root_user();
1389         }
1390
1391         /* load service specific parameters */
1392         if (conn) {
1393                 if (req->encrypted) {
1394                         conn->encrypted_tid = true;
1395                         /* encrypted required from now on. */
1396                         conn->encrypt_level = Required;
1397                 } else if (ENCRYPTION_REQUIRED(conn)) {
1398                         if (req->cmd != SMBtrans2 && req->cmd != SMBtranss2) {
1399                                 exit_server_cleanly("encryption required "
1400                                         "on connection");
1401                                 return conn;
1402                         }
1403                 }
1404
1405                 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1406                                          (flags & (AS_USER|DO_CHDIR)
1407                                           ?True:False))) {
1408                         reply_doserror(req, ERRSRV, ERRaccess);
1409                         return conn;
1410                 }
1411                 conn->num_smb_operations++;
1412         }
1413
1414         /* does this protocol need to be run as guest? */
1415         if ((flags & AS_GUEST)
1416             && (!change_to_guest() ||
1417                 !check_access(smbd_server_fd(), lp_hostsallow(-1),
1418                               lp_hostsdeny(-1)))) {
1419                 reply_doserror(req, ERRSRV, ERRaccess);
1420                 return conn;
1421         }
1422
1423         smb_messages[type].fn(req);
1424         return req->conn;
1425 }
1426
1427 /****************************************************************************
1428  Construct a reply to the incoming packet.
1429 ****************************************************************************/
1430
1431 static void construct_reply(char *inbuf, int size, size_t unread_bytes, bool encrypted)
1432 {
1433         connection_struct *conn;
1434         struct smb_request *req;
1435
1436         chain_size = 0;
1437
1438         if (!(req = talloc(talloc_tos(), struct smb_request))) {
1439                 smb_panic("could not allocate smb_request");
1440         }
1441         init_smb_request(req, (uint8 *)inbuf, unread_bytes, encrypted);
1442         req->inbuf  = (uint8_t *)talloc_move(req, &inbuf);
1443
1444         conn = switch_message(req->cmd, req, size);
1445
1446         if (req->unread_bytes) {
1447                 /* writeX failed. drain socket. */
1448                 if (drain_socket(smbd_server_fd(), req->unread_bytes) !=
1449                                 req->unread_bytes) {
1450                         smb_panic("failed to drain pending bytes");
1451                 }
1452                 req->unread_bytes = 0;
1453         }
1454
1455         if (req->outbuf == NULL) {
1456                 return;
1457         }
1458
1459         if (CVAL(req->outbuf,0) == 0) {
1460                 show_msg((char *)req->outbuf);
1461         }
1462
1463         if (!srv_send_smb(smbd_server_fd(),
1464                         (char *)req->outbuf,
1465                         IS_CONN_ENCRYPTED(conn)||req->encrypted)) {
1466                 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1467         }
1468
1469         TALLOC_FREE(req);
1470
1471         return;
1472 }
1473
1474 /****************************************************************************
1475  Process an smb from the client
1476 ****************************************************************************/
1477
1478 static void process_smb(struct smbd_server_connection *conn,
1479                         uint8_t *inbuf, size_t nread, size_t unread_bytes,
1480                         bool encrypted)
1481 {
1482         int msg_type = CVAL(inbuf,0);
1483
1484         DO_PROFILE_INC(smb_count);
1485
1486         DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1487                     smb_len(inbuf) ) );
1488         DEBUG( 3, ( "Transaction %d of length %d (%u toread)\n", trans_num,
1489                                 (int)nread,
1490                                 (unsigned int)unread_bytes ));
1491
1492         if (msg_type != 0) {
1493                 /*
1494                  * NetBIOS session request, keepalive, etc.
1495                  */
1496                 reply_special((char *)inbuf);
1497                 goto done;
1498         }
1499
1500         show_msg((char *)inbuf);
1501
1502         construct_reply((char *)inbuf,nread,unread_bytes,encrypted);
1503
1504         trans_num++;
1505
1506 done:
1507         conn->num_requests++;
1508
1509         /* The timeout_processing function isn't run nearly
1510            often enough to implement 'max log size' without
1511            overrunning the size of the file by many megabytes.
1512            This is especially true if we are running at debug
1513            level 10.  Checking every 50 SMBs is a nice
1514            tradeoff of performance vs log file size overrun. */
1515
1516         if ((conn->num_requests % 50) == 0 &&
1517             need_to_check_log_size()) {
1518                 change_to_root_user();
1519                 check_log_size();
1520         }
1521 }
1522
1523 /****************************************************************************
1524  Return a string containing the function name of a SMB command.
1525 ****************************************************************************/
1526
1527 const char *smb_fn_name(int type)
1528 {
1529         const char *unknown_name = "SMBunknown";
1530
1531         if (smb_messages[type].name == NULL)
1532                 return(unknown_name);
1533
1534         return(smb_messages[type].name);
1535 }
1536
1537 /****************************************************************************
1538  Helper functions for contruct_reply.
1539 ****************************************************************************/
1540
1541 void add_to_common_flags2(uint32 v)
1542 {
1543         common_flags2 |= v;
1544 }
1545
1546 void remove_from_common_flags2(uint32 v)
1547 {
1548         common_flags2 &= ~v;
1549 }
1550
1551 static void construct_reply_common(struct smb_request *req, const char *inbuf,
1552                                    char *outbuf)
1553 {
1554         srv_set_message(outbuf,0,0,false);
1555
1556         SCVAL(outbuf, smb_com, req->cmd);
1557         SIVAL(outbuf,smb_rcls,0);
1558         SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1559         SSVAL(outbuf,smb_flg2,
1560                 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
1561                 common_flags2);
1562         memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1563
1564         SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1565         SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1566         SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1567         SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1568 }
1569
1570 void construct_reply_common_req(struct smb_request *req, char *outbuf)
1571 {
1572         construct_reply_common(req, (char *)req->inbuf, outbuf);
1573 }
1574
1575 /*
1576  * How many bytes have we already accumulated up to the current wct field
1577  * offset?
1578  */
1579
1580 size_t req_wct_ofs(struct smb_request *req)
1581 {
1582         size_t buf_size;
1583
1584         if (req->chain_outbuf == NULL) {
1585                 return smb_wct - 4;
1586         }
1587         buf_size = talloc_get_size(req->chain_outbuf);
1588         if ((buf_size % 4) != 0) {
1589                 buf_size += (4 - (buf_size % 4));
1590         }
1591         return buf_size - 4;
1592 }
1593
1594 /*
1595  * Hack around reply_nterror & friends not being aware of chained requests,
1596  * generating illegal (i.e. wct==0) chain replies.
1597  */
1598
1599 static void fixup_chain_error_packet(struct smb_request *req)
1600 {
1601         uint8_t *outbuf = req->outbuf;
1602         req->outbuf = NULL;
1603         reply_outbuf(req, 2, 0);
1604         memcpy(req->outbuf, outbuf, smb_wct);
1605         TALLOC_FREE(outbuf);
1606         SCVAL(req->outbuf, smb_vwv0, 0xff);
1607 }
1608
1609 /****************************************************************************
1610  Construct a chained reply and add it to the already made reply
1611 ****************************************************************************/
1612
1613 void chain_reply(struct smb_request *req)
1614 {
1615         size_t smblen = smb_len(req->inbuf);
1616         size_t already_used, length_needed;
1617         uint8_t chain_cmd;
1618         uint32_t chain_offset;  /* uint32_t to avoid overflow */
1619
1620         uint8_t wct;
1621         uint16_t *vwv;
1622         uint16_t buflen;
1623         uint8_t *buf;
1624
1625         if (IVAL(req->outbuf, smb_rcls) != 0) {
1626                 fixup_chain_error_packet(req);
1627         }
1628
1629         /*
1630          * Any of the AndX requests and replies have at least a wct of
1631          * 2. vwv[0] is the next command, vwv[1] is the offset from the
1632          * beginning of the SMB header to the next wct field.
1633          *
1634          * None of the AndX requests put anything valuable in vwv[0] and [1],
1635          * so we can overwrite it here to form the chain.
1636          */
1637
1638         if ((req->wct < 2) || (CVAL(req->outbuf, smb_wct) < 2)) {
1639                 goto error;
1640         }
1641
1642         /*
1643          * Here we assume that this is the end of the chain. For that we need
1644          * to set "next command" to 0xff and the offset to 0. If we later find
1645          * more commands in the chain, this will be overwritten again.
1646          */
1647
1648         SCVAL(req->outbuf, smb_vwv0, 0xff);
1649         SCVAL(req->outbuf, smb_vwv0+1, 0);
1650         SSVAL(req->outbuf, smb_vwv1, 0);
1651
1652         if (req->chain_outbuf == NULL) {
1653                 /*
1654                  * In req->chain_outbuf we collect all the replies. Start the
1655                  * chain by copying in the first reply.
1656                  *
1657                  * We do the realloc because later on we depend on
1658                  * talloc_get_size to determine the length of
1659                  * chain_outbuf. The reply_xxx routines might have
1660                  * over-allocated (reply_pipe_read_and_X used to be such an
1661                  * example).
1662                  */
1663                 req->chain_outbuf = TALLOC_REALLOC_ARRAY(
1664                         req, req->outbuf, uint8_t, smb_len(req->outbuf) + 4);
1665                 if (req->chain_outbuf == NULL) {
1666                         goto error;
1667                 }
1668                 req->outbuf = NULL;
1669         } else {
1670                 if (!smb_splice_chain(&req->chain_outbuf,
1671                                       CVAL(req->outbuf, smb_com),
1672                                       CVAL(req->outbuf, smb_wct),
1673                                       (uint16_t *)(req->outbuf + smb_vwv),
1674                                       0, smb_buflen(req->outbuf),
1675                                       (uint8_t *)smb_buf(req->outbuf))) {
1676                         goto error;
1677                 }
1678                 TALLOC_FREE(req->outbuf);
1679         }
1680
1681         /*
1682          * We use the old request's vwv field to grab the next chained command
1683          * and offset into the chained fields.
1684          */
1685
1686         chain_cmd = CVAL(req->vwv+0, 0);
1687         chain_offset = SVAL(req->vwv+1, 0);
1688
1689         if (chain_cmd == 0xff) {
1690                 /*
1691                  * End of chain, no more requests from the client. So ship the
1692                  * replies.
1693                  */
1694                 smb_setlen((char *)(req->chain_outbuf),
1695                            talloc_get_size(req->chain_outbuf) - 4);
1696                 if (!srv_send_smb(smbd_server_fd(), (char *)req->chain_outbuf,
1697                                   IS_CONN_ENCRYPTED(req->conn)
1698                                   ||req->encrypted)) {
1699                         exit_server_cleanly("chain_reply: srv_send_smb "
1700                                             "failed.");
1701                 }
1702                 return;
1703         }
1704
1705         /*
1706          * Check if the client tries to fool us. The request so far uses the
1707          * space to the end of the byte buffer in the request just
1708          * processed. The chain_offset can't point into that area. If that was
1709          * the case, we could end up with an endless processing of the chain,
1710          * we would always handle the same request.
1711          */
1712
1713         already_used = PTR_DIFF(req->buf+req->buflen, smb_base(req->inbuf));
1714         if (chain_offset < already_used) {
1715                 goto error;
1716         }
1717
1718         /*
1719          * Next check: Make sure the chain offset does not point beyond the
1720          * overall smb request length.
1721          */
1722
1723         length_needed = chain_offset+1; /* wct */
1724         if (length_needed > smblen) {
1725                 goto error;
1726         }
1727
1728         /*
1729          * Now comes the pointer magic. Goal here is to set up req->vwv and
1730          * req->buf correctly again to be able to call the subsequent
1731          * switch_message(). The chain offset (the former vwv[1]) points at
1732          * the new wct field.
1733          */
1734
1735         wct = CVAL(smb_base(req->inbuf), chain_offset);
1736
1737         /*
1738          * Next consistency check: Make the new vwv array fits in the overall
1739          * smb request.
1740          */
1741
1742         length_needed += (wct+1)*sizeof(uint16_t); /* vwv+buflen */
1743         if (length_needed > smblen) {
1744                 goto error;
1745         }
1746         vwv = (uint16_t *)(smb_base(req->inbuf) + chain_offset + 1);
1747
1748         /*
1749          * Now grab the new byte buffer....
1750          */
1751
1752         buflen = SVAL(vwv+wct, 0);
1753
1754         /*
1755          * .. and check that it fits.
1756          */
1757
1758         length_needed += buflen;
1759         if (length_needed > smblen) {
1760                 goto error;
1761         }
1762         buf = (uint8_t *)(vwv+wct+1);
1763
1764         req->cmd = chain_cmd;
1765         req->wct = wct;
1766         req->vwv = vwv;
1767         req->buflen = buflen;
1768         req->buf = buf;
1769
1770         switch_message(chain_cmd, req, smblen);
1771
1772         if (req->outbuf == NULL) {
1773                 /*
1774                  * This happens if the chained command has suspended itself or
1775                  * if it has called srv_send_smb() itself.
1776                  */
1777                 return;
1778         }
1779
1780         /*
1781          * We end up here if the chained command was not itself chained or
1782          * suspended, but for example a close() command. We now need to splice
1783          * the chained commands' outbuf into the already built up chain_outbuf
1784          * and ship the result.
1785          */
1786         goto done;
1787
1788  error:
1789         /*
1790          * We end up here if there's any error in the chain syntax. Report a
1791          * DOS error, just like Windows does.
1792          */
1793         reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRerror));
1794         fixup_chain_error_packet(req);
1795
1796  done:
1797         if (!smb_splice_chain(&req->chain_outbuf,
1798                               CVAL(req->outbuf, smb_com),
1799                               CVAL(req->outbuf, smb_wct),
1800                               (uint16_t *)(req->outbuf + smb_vwv),
1801                               0, smb_buflen(req->outbuf),
1802                               (uint8_t *)smb_buf(req->outbuf))) {
1803                 exit_server_cleanly("chain_reply: smb_splice_chain failed\n");
1804         }
1805         TALLOC_FREE(req->outbuf);
1806
1807         smb_setlen((char *)(req->chain_outbuf),
1808                    talloc_get_size(req->chain_outbuf) - 4);
1809
1810         show_msg((char *)(req->chain_outbuf));
1811
1812         if (!srv_send_smb(smbd_server_fd(), (char *)req->chain_outbuf,
1813                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted)) {
1814                 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1815         }
1816 }
1817
1818 /****************************************************************************
1819  Check if services need reloading.
1820 ****************************************************************************/
1821
1822 void check_reload(time_t t)
1823 {
1824         time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
1825
1826         if(last_smb_conf_reload_time == 0) {
1827                 last_smb_conf_reload_time = t;
1828                 /* Our printing subsystem might not be ready at smbd start up.
1829                    Then no printer is available till the first printers check
1830                    is performed.  A lower initial interval circumvents this. */
1831                 if ( printcap_cache_time > 60 )
1832                         last_printer_reload_time = t - printcap_cache_time + 60;
1833                 else
1834                         last_printer_reload_time = t;
1835         }
1836
1837         if (mypid != getpid()) { /* First time or fork happened meanwhile */
1838                 /* randomize over 60 second the printcap reload to avoid all
1839                  * process hitting cupsd at the same time */
1840                 int time_range = 60;
1841
1842                 last_printer_reload_time += random() % time_range;
1843                 mypid = getpid();
1844         }
1845
1846         if (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK) {
1847                 reload_services(True);
1848                 last_smb_conf_reload_time = t;
1849         }
1850
1851         /* 'printcap cache time = 0' disable the feature */
1852
1853         if ( printcap_cache_time != 0 )
1854         {
1855                 /* see if it's time to reload or if the clock has been set back */
1856
1857                 if ( (t >= last_printer_reload_time+printcap_cache_time)
1858                         || (t-last_printer_reload_time  < 0) )
1859                 {
1860                         DEBUG( 3,( "Printcap cache time expired.\n"));
1861                         reload_printers();
1862                         last_printer_reload_time = t;
1863                 }
1864         }
1865 }
1866
1867 static void smbd_server_connection_write_handler(struct smbd_server_connection *conn)
1868 {
1869         /* TODO: make write nonblocking */
1870 }
1871
1872 static void smbd_server_connection_read_handler(struct smbd_server_connection *conn)
1873 {
1874         uint8_t *inbuf = NULL;
1875         size_t inbuf_len = 0;
1876         size_t unread_bytes = 0;
1877         bool encrypted = false;
1878         TALLOC_CTX *mem_ctx = talloc_tos();
1879         NTSTATUS status;
1880
1881         /* TODO: make this completely nonblocking */
1882
1883         status = receive_smb_talloc(mem_ctx, smbd_server_fd(),
1884                                     (char **)(void *)&inbuf,
1885                                     0, /* timeout */
1886                                     &unread_bytes,
1887                                     &encrypted,
1888                                     &inbuf_len);
1889         if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1890                 goto process;
1891         }
1892         if (NT_STATUS_IS_ERR(status)) {
1893                 exit_server_cleanly("failed to receive smb request");
1894         }
1895         if (!NT_STATUS_IS_OK(status)) {
1896                 return;
1897         }
1898
1899 process:
1900         process_smb(conn, inbuf, inbuf_len, unread_bytes, encrypted);
1901 }
1902
1903 static void smbd_server_connection_handler(struct event_context *ev,
1904                                            struct fd_event *fde,
1905                                            uint16_t flags,
1906                                            void *private_data)
1907 {
1908         struct smbd_server_connection *conn = talloc_get_type(private_data,
1909                                               struct smbd_server_connection);
1910
1911         if (flags & EVENT_FD_WRITE) {
1912                 smbd_server_connection_write_handler(conn);
1913         } else if (flags & EVENT_FD_READ) {
1914                 smbd_server_connection_read_handler(conn);
1915         }
1916 }
1917
1918
1919 /****************************************************************************
1920 received when we should release a specific IP
1921 ****************************************************************************/
1922 static void release_ip(const char *ip, void *priv)
1923 {
1924         char addr[INET6_ADDRSTRLEN];
1925
1926         if (strcmp(client_socket_addr(get_client_fd(),addr,sizeof(addr)), ip) == 0) {
1927                 /* we can't afford to do a clean exit - that involves
1928                    database writes, which would potentially mean we
1929                    are still running after the failover has finished -
1930                    we have to get rid of this process ID straight
1931                    away */
1932                 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
1933                         ip));
1934                 /* note we must exit with non-zero status so the unclean handler gets
1935                    called in the parent, so that the brl database is tickled */
1936                 _exit(1);
1937         }
1938 }
1939
1940 static void msg_release_ip(struct messaging_context *msg_ctx, void *private_data,
1941                            uint32_t msg_type, struct server_id server_id, DATA_BLOB *data)
1942 {
1943         release_ip((char *)data->data, NULL);
1944 }
1945
1946 #ifdef CLUSTER_SUPPORT
1947 static int client_get_tcp_info(struct sockaddr_storage *server,
1948                                struct sockaddr_storage *client)
1949 {
1950         socklen_t length;
1951         if (server_fd == -1) {
1952                 return -1;
1953         }
1954         length = sizeof(*server);
1955         if (getsockname(server_fd, (struct sockaddr *)server, &length) != 0) {
1956                 return -1;
1957         }
1958         length = sizeof(*client);
1959         if (getpeername(server_fd, (struct sockaddr *)client, &length) != 0) {
1960                 return -1;
1961         }
1962         return 0;
1963 }
1964 #endif
1965
1966 /*
1967  * Send keepalive packets to our client
1968  */
1969 static bool keepalive_fn(const struct timeval *now, void *private_data)
1970 {
1971         if (!send_keepalive(smbd_server_fd())) {
1972                 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1973                 return False;
1974         }
1975         return True;
1976 }
1977
1978 /*
1979  * Do the recurring check if we're idle
1980  */
1981 static bool deadtime_fn(const struct timeval *now, void *private_data)
1982 {
1983         if ((conn_num_open() == 0)
1984             || (conn_idle_all(now->tv_sec))) {
1985                 DEBUG( 2, ( "Closing idle connection\n" ) );
1986                 messaging_send(smbd_messaging_context(), procid_self(),
1987                                MSG_SHUTDOWN, &data_blob_null);
1988                 return False;
1989         }
1990
1991         return True;
1992 }
1993
1994 /*
1995  * Do the recurring log file and smb.conf reload checks.
1996  */
1997
1998 static bool housekeeping_fn(const struct timeval *now, void *private_data)
1999 {
2000         change_to_root_user();
2001
2002         /* update printer queue caches if necessary */
2003         update_monitored_printq_cache();
2004
2005         /* check if we need to reload services */
2006         check_reload(time(NULL));
2007
2008         /* Change machine password if neccessary. */
2009         attempt_machine_password_change();
2010
2011         /*
2012          * Force a log file check.
2013          */
2014         force_check_log_size();
2015         check_log_size();
2016         return true;
2017 }
2018
2019 /****************************************************************************
2020  Process commands from the client
2021 ****************************************************************************/
2022
2023 void smbd_process(void)
2024 {
2025         TALLOC_CTX *frame = talloc_stackframe();
2026         char remaddr[INET6_ADDRSTRLEN];
2027
2028         smbd_server_conn = talloc_zero(smbd_event_context(), struct smbd_server_connection);
2029         if (!smbd_server_conn) {
2030                 exit_server("failed to create smbd_server_connection");
2031         }
2032
2033         /* Ensure child is set to blocking mode */
2034         set_blocking(smbd_server_fd(),True);
2035
2036         set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
2037         set_socket_options(smbd_server_fd(), lp_socket_options());
2038
2039         /* this is needed so that we get decent entries
2040            in smbstatus for port 445 connects */
2041         set_remote_machine_name(get_peer_addr(smbd_server_fd(),
2042                                               remaddr,
2043                                               sizeof(remaddr)),
2044                                               false);
2045         reload_services(true);
2046
2047         /*
2048          * Before the first packet, check the global hosts allow/ hosts deny
2049          * parameters before doing any parsing of packets passed to us by the
2050          * client. This prevents attacks on our parsing code from hosts not in
2051          * the hosts allow list.
2052          */
2053
2054         if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
2055                           lp_hostsdeny(-1))) {
2056                 char addr[INET6_ADDRSTRLEN];
2057
2058                 /*
2059                  * send a negative session response "not listening on calling
2060                  * name"
2061                  */
2062                 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
2063                 DEBUG( 1, ("Connection denied from %s\n",
2064                            client_addr(get_client_fd(),addr,sizeof(addr)) ) );
2065                 (void)srv_send_smb(smbd_server_fd(),(char *)buf,false);
2066                 exit_server_cleanly("connection denied");
2067         }
2068
2069         static_init_rpc;
2070
2071         init_modules();
2072
2073         if (!init_account_policy()) {
2074                 exit_server("Could not open account policy tdb.\n");
2075         }
2076
2077         if (*lp_rootdir()) {
2078                 if (chroot(lp_rootdir()) != 0) {
2079                         DEBUG(0,("Failed changed root to %s\n", lp_rootdir()));
2080                         exit_server("Failed to chroot()");
2081                 }
2082                 DEBUG(0,("Changed root to %s\n", lp_rootdir()));
2083         }
2084
2085         /* Setup oplocks */
2086         if (!init_oplocks(smbd_messaging_context()))
2087                 exit_server("Failed to init oplocks");
2088
2089         /* Setup aio signal handler. */
2090         initialize_async_io_handler();
2091
2092         /* register our message handlers */
2093         messaging_register(smbd_messaging_context(), NULL,
2094                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
2095         messaging_register(smbd_messaging_context(), NULL,
2096                            MSG_SMB_RELEASE_IP, msg_release_ip);
2097         messaging_register(smbd_messaging_context(), NULL,
2098                            MSG_SMB_CLOSE_FILE, msg_close_file);
2099
2100         if ((lp_keepalive() != 0)
2101             && !(event_add_idle(smbd_event_context(), NULL,
2102                                 timeval_set(lp_keepalive(), 0),
2103                                 "keepalive", keepalive_fn,
2104                                 NULL))) {
2105                 DEBUG(0, ("Could not add keepalive event\n"));
2106                 exit(1);
2107         }
2108
2109         if (!(event_add_idle(smbd_event_context(), NULL,
2110                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
2111                              "deadtime", deadtime_fn, NULL))) {
2112                 DEBUG(0, ("Could not add deadtime event\n"));
2113                 exit(1);
2114         }
2115
2116         if (!(event_add_idle(smbd_event_context(), NULL,
2117                              timeval_set(SMBD_SELECT_TIMEOUT, 0),
2118                              "housekeeping", housekeeping_fn, NULL))) {
2119                 DEBUG(0, ("Could not add housekeeping event\n"));
2120                 exit(1);
2121         }
2122
2123 #ifdef CLUSTER_SUPPORT
2124
2125         if (lp_clustering()) {
2126                 /*
2127                  * We need to tell ctdb about our client's TCP
2128                  * connection, so that for failover ctdbd can send
2129                  * tickle acks, triggering a reconnection by the
2130                  * client.
2131                  */
2132
2133                 struct sockaddr_storage srv, clnt;
2134
2135                 if (client_get_tcp_info(&srv, &clnt) == 0) {
2136
2137                         NTSTATUS status;
2138
2139                         status = ctdbd_register_ips(
2140                                 messaging_ctdbd_connection(),
2141                                 &srv, &clnt, release_ip, NULL);
2142
2143                         if (!NT_STATUS_IS_OK(status)) {
2144                                 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
2145                                           nt_errstr(status)));
2146                         }
2147                 } else
2148                 {
2149                         DEBUG(0,("Unable to get tcp info for "
2150                                  "CTDB_CONTROL_TCP_CLIENT: %s\n",
2151                                  strerror(errno)));
2152                 }
2153         }
2154
2155 #endif
2156
2157         max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
2158
2159         smbd_server_conn->fde = event_add_fd(smbd_event_context(),
2160                                              smbd_server_conn,
2161                                              smbd_server_fd(),
2162                                              EVENT_FD_READ,
2163                                              smbd_server_connection_handler,
2164                                              smbd_server_conn);
2165         if (!smbd_server_conn->fde) {
2166                 exit_server("failed to create smbd_server_connection fde");
2167         }
2168
2169         TALLOC_FREE(frame);
2170
2171         while (True) {
2172                 NTSTATUS status;
2173
2174                 frame = talloc_stackframe_pool(8192);
2175
2176                 errno = 0;
2177
2178                 status = smbd_server_connection_loop_once(smbd_server_conn);
2179                 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY) &&
2180                     !NT_STATUS_IS_OK(status)) {
2181                         DEBUG(3, ("smbd_server_connection_loop_once failed: %s,"
2182                                   " exiting\n", nt_errstr(status)));
2183                         break;
2184                 }
2185
2186                 TALLOC_FREE(frame);
2187         }
2188
2189         exit_server_cleanly(NULL);
2190 }