source3/smbd/process.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    process incoming packets - main loop
   4    Copyright (C) Andrew Tridgell 1992-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 struct timeval smb_last_time;
  24
  25 static char *InBuffer = NULL;
  26 char *OutBuffer = NULL;
  27 char *last_inbuf = NULL;
  28
  29 /*
  30  * Size of data we can send to client. Set
  31  *  by the client for all protocols above CORE.
  32  *  Set by us for CORE protocol.
  33  */
  34 int max_send = BUFFER_SIZE;
  35 /*
  36  * Size of the data we can receive. Set by us.
  37  * Can be modified by the max xmit parameter.
  38  */
  39 int max_recv = BUFFER_SIZE;
  40
  41 extern int last_message;
  42 extern int global_oplock_break;
  43 extern userdom_struct current_user_info;
  44 extern int smb_read_error;
  45 SIG_ATOMIC_T reload_after_sighup = 0;
  46 SIG_ATOMIC_T got_sig_term = 0;
  47 BOOL global_machine_password_needs_changing = False;
  48 extern int max_send;
  49
  50 /****************************************************************************
  51  structure to hold a linked list of queued messages.
  52  for processing.
  53 ****************************************************************************/
  54
  55 typedef struct {
  56    ubi_slNode msg_next;
  57    char *msg_buf;
  58    int msg_len;
  59 } pending_message_list;
  60
  61 static ubi_slList smb_oplock_queue = { NULL, (ubi_slNodePtr)&smb_oplock_queue, 0};
  62
  63 /****************************************************************************
  64  Function to push a message onto the tail of a linked list of smb messages ready
  65  for processing.
  66 ****************************************************************************/
  67
  68 static BOOL push_message(ubi_slList *list_head, char *buf, int msg_len)
  69 {
  70   pending_message_list *msg = (pending_message_list *)
  71                                malloc(sizeof(pending_message_list));
  72
  73   if(msg == NULL)
  74   {
  75     DEBUG(0,("push_message: malloc fail (1)\n"));
  76     return False;
  77   }
  78
  79   msg->msg_buf = (char *)malloc(msg_len);
  80   if(msg->msg_buf == NULL)
  81   {
  82     DEBUG(0,("push_message: malloc fail (2)\n"));
  83     SAFE_FREE(msg);
  84     return False;
  85   }
  86
  87   memcpy(msg->msg_buf, buf, msg_len);
  88   msg->msg_len = msg_len;
  89
  90   ubi_slAddTail( list_head, msg);
  91
  92   return True;
  93 }
  94
  95 /****************************************************************************
  96  Function to push a smb message onto a linked list of local smb messages ready
  97  for processing.
  98 ****************************************************************************/
  99
 100 BOOL push_oplock_pending_smb_message(char *buf, int msg_len)
 101 {
 102         return push_message(&smb_oplock_queue, buf, msg_len);
 103 }
 104
 105 /****************************************************************************
 106  Do all async processing in here. This includes UDB oplock messages, kernel
 107  oplock messages, change notify events etc.
 108 ****************************************************************************/
 109
 110 static void async_processing(char *buffer, int buffer_len)
 111 {
 112         DEBUG(10,("async_processing: Doing async processing.\n"));
 113
 114         /* check for oplock messages (both UDP and kernel) */
 115         if (receive_local_message(buffer, buffer_len, 1)) {
 116                 process_local_message(buffer, buffer_len);
 117         }
 118
 119         if (got_sig_term) {
 120                 exit_server("Caught TERM signal");
 121         }
 122
 123         /* check for async change notify events */
 124         process_pending_change_notify_queue(0);
 125
 126         /* check for sighup processing */
 127         if (reload_after_sighup) {
 128                 change_to_root_user();
 129                 DEBUG(1,("Reloading services after SIGHUP\n"));
 130                 reload_services(False);
 131                 reload_after_sighup = 0;
 132         }
 133 }
 134
 135 /****************************************************************************
 136   Do a select on an two fd's - with timeout.
 137
 138   If a local udp message has been pushed onto the
 139   queue (this can only happen during oplock break
 140   processing) call async_processing()
 141
 142   If a pending smb message has been pushed onto the
 143   queue (this can only happen during oplock break
 144   processing) return this next.
 145
 146   If the first smbfd is ready then read an smb from it.
 147   if the second (loopback UDP) fd is ready then read a message
 148   from it and setup the buffer header to identify the length
 149   and from address.
 150   Returns False on timeout or error.
 151   Else returns True.
 152
 153 The timeout is in milliseconds
 154 ****************************************************************************/
 155
 156 static BOOL receive_message_or_smb(char *buffer, int buffer_len, int timeout)
 157 {
 158         fd_set fds;
 159         int selrtn;
 160         struct timeval to;
 161         int maxfd;
 162
 163         smb_read_error = 0;
 164
 165  again:
 166
 167         /*
 168          * Note that this call must be before processing any SMB
 169          * messages as we need to synchronously process any messages
 170          * we may have sent to ourselves from the previous SMB.
 171          */
 172         message_dispatch();
 173
 174         /*
 175          * Check to see if we already have a message on the smb queue.
 176          * If so - copy and return it.
 177          */
 178         if(ubi_slCount(&smb_oplock_queue) != 0) {
 179                 pending_message_list *msg = (pending_message_list *)ubi_slRemHead(&smb_oplock_queue);
 180                 memcpy(buffer, msg->msg_buf, MIN(buffer_len, msg->msg_len));
 181
 182                 /* Free the message we just copied. */
 183                 SAFE_FREE(msg->msg_buf);
 184                 SAFE_FREE(msg);
 185
 186                 DEBUG(5,("receive_message_or_smb: returning queued smb message.\n"));
 187                 return True;
 188         }
 189
 190
 191         /*
 192          * Setup the select read fd set.
 193          */
 194
 195         FD_ZERO(&fds);
 196
 197         /*
 198          * Ensure we process oplock break messages by preference.
 199          * We have to do this before the select, after the select
 200          * and if the select returns EINTR. This is due to the fact
 201          * that the selects called from async_processing can eat an EINTR
 202          * caused by a signal (we can't take the break message there).
 203          * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
 204          */
 205
 206         if (oplock_message_waiting(&fds)) {
 207                 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
 208                 async_processing(buffer, buffer_len);
 209                 /*
 210                  * After async processing we must go and do the select again, as
 211                  * the state of the flag in fds for the server file descriptor is
 212                  * indeterminate - we may have done I/O on it in the oplock processing. JRA.
 213                  */
 214                 goto again;
 215         }
 216
 217         FD_SET(smbd_server_fd(),&fds);
 218         maxfd = setup_oplock_select_set(&fds);
 219
 220         to.tv_sec = timeout / 1000;
 221         to.tv_usec = (timeout % 1000) * 1000;
 222
 223         selrtn = sys_select(MAX(maxfd,smbd_server_fd())+1,&fds,NULL,NULL,timeout>0?&to:NULL);
 224
 225         /* if we get EINTR then maybe we have received an oplock
 226            signal - treat this as select returning 1. This is ugly, but
 227            is the best we can do until the oplock code knows more about
 228            signals */
 229         if (selrtn == -1 && errno == EINTR) {
 230                 async_processing(buffer, buffer_len);
 231                 /*
 232                  * After async processing we must go and do the select again, as
 233                  * the state of the flag in fds for the server file descriptor is
 234                  * indeterminate - we may have done I/O on it in the oplock processing. JRA.
 235                  */
 236                 goto again;
 237         }
 238
 239         /* Check if error */
 240         if (selrtn == -1) {
 241                 /* something is wrong. Maybe the socket is dead? */
 242                 smb_read_error = READ_ERROR;
 243                 return False;
 244         }
 245
 246         /* Did we timeout ? */
 247         if (selrtn == 0) {
 248                 smb_read_error = READ_TIMEOUT;
 249                 return False;
 250         }
 251
 252         /*
 253          * Ensure we process oplock break messages by preference.
 254          * This is IMPORTANT ! Otherwise we can starve other processes
 255          * sending us an oplock break message. JRA.
 256          */
 257
 258         if (oplock_message_waiting(&fds)) {
 259                 async_processing(buffer, buffer_len);
 260                 /*
 261                  * After async processing we must go and do the select again, as
 262                  * the state of the flag in fds for the server file descriptor is
 263                  * indeterminate - we may have done I/O on it in the oplock processing. JRA.
 264                  */
 265                 goto again;
 266         }
 267
 268         return receive_smb(smbd_server_fd(), buffer, 0);
 269 }
 270
 271 /****************************************************************************
 272 Get the next SMB packet, doing the local message processing automatically.
 273 ****************************************************************************/
 274
 275 BOOL receive_next_smb(char *inbuf, int bufsize, int timeout)
 276 {
 277         BOOL got_keepalive;
 278         BOOL ret;
 279
 280         do {
 281                 ret = receive_message_or_smb(inbuf,bufsize,timeout);
 282
 283                 got_keepalive = (ret && (CVAL(inbuf,0) == SMBkeepalive));
 284         } while (ret && got_keepalive);
 285
 286         return ret;
 287 }
 288
 289 /****************************************************************************
 290  We're terminating and have closed all our files/connections etc.
 291  If there are any pending local messages we need to respond to them
 292  before termination so that other smbds don't think we just died whilst
 293  holding oplocks.
 294 ****************************************************************************/
 295
 296 void respond_to_all_remaining_local_messages(void)
 297 {
 298   char buffer[1024];
 299
 300   /*
 301    * Assert we have no exclusive open oplocks.
 302    */
 303
 304   if(get_number_of_exclusive_open_oplocks()) {
 305     DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
 306           get_number_of_exclusive_open_oplocks() ));
 307     return;
 308   }
 309
 310   /*
 311    * Keep doing receive_local_message with a 1 ms timeout until
 312    * we have no more messages.
 313    */
 314   while(receive_local_message(buffer, sizeof(buffer), 1)) {
 315           /* Deal with oplock break requests from other smbd's. */
 316           process_local_message(buffer, sizeof(buffer));
 317   }
 318
 319   return;
 320 }
 321
 322
 323 /*
 324 These flags determine some of the permissions required to do an operation
 325
 326 Note that I don't set NEED_WRITE on some write operations because they
 327 are used by some brain-dead clients when printing, and I don't want to
 328 force write permissions on print services.
 329 */
 330 #define AS_USER (1<<0)
 331 #define NEED_WRITE (1<<1)
 332 #define TIME_INIT (1<<2)
 333 #define CAN_IPC (1<<3)
 334 #define AS_GUEST (1<<5)
 335 #define QUEUE_IN_OPLOCK (1<<6)
 336
 337 /*
 338    define a list of possible SMB messages and their corresponding
 339    functions. Any message that has a NULL function is unimplemented -
 340    please feel free to contribute implementations!
 341 */
 342 static const struct smb_message_struct
 343 {
 344   const char *name;
 345   int (*fn)(connection_struct *conn, char *, char *, int, int);
 346   int flags;
 347 }
 348  smb_messages[256] = {
 349
 350 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
 351 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
 352 /* 0x02 */ { "SMBopen",reply_open,AS_USER | QUEUE_IN_OPLOCK },
 353 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
 354 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
 355 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
 356 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
 357 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
 358 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
 359 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
 360 /* 0x0a */ { "SMBread",reply_read,AS_USER},
 361 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
 362 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
 363 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
 364 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER | QUEUE_IN_OPLOCK },
 365 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
 366 /* 0x10 */ { "SMBchkpth",reply_chkpth,AS_USER},
 367 /* 0x11 */ { "SMBexit",reply_exit,0},
 368 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
 369 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
 370 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
 371 /* 0x15 */ { NULL, NULL, 0 },
 372 /* 0x16 */ { NULL, NULL, 0 },
 373 /* 0x17 */ { NULL, NULL, 0 },
 374 /* 0x18 */ { NULL, NULL, 0 },
 375 /* 0x19 */ { NULL, NULL, 0 },
 376 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
 377 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
 378 /* 0x1c */ { "SMBreadBs",NULL,0 },
 379 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
 380 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
 381 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
 382 /* 0x20 */ { "SMBwritec",NULL,0},
 383 /* 0x21 */ { NULL, NULL, 0 },
 384 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
 385 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
 386 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
 387 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
 388 /* 0x26 */ { "SMBtranss",NULL,AS_USER | CAN_IPC},
 389 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
 390 /* 0x28 */ { "SMBioctls",NULL,AS_USER},
 391 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
 392 /* 0x2a */ { "SMBmove",NULL,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
 393 /* 0x2b */ { "SMBecho",reply_echo,0},
 394 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
 395 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
 396 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
 397 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
 398 /* 0x30 */ { NULL, NULL, 0 },
 399 /* 0x31 */ { NULL, NULL, 0 },
 400 /* 0x32 */ { "SMBtrans2", reply_trans2, AS_USER | CAN_IPC },
 401 /* 0x33 */ { "SMBtranss2", reply_transs2, AS_USER},
 402 /* 0x34 */ { "SMBfindclose", reply_findclose,AS_USER},
 403 /* 0x35 */ { "SMBfindnclose", reply_findnclose, AS_USER},
 404 /* 0x36 */ { NULL, NULL, 0 },
 405 /* 0x37 */ { NULL, NULL, 0 },
 406 /* 0x38 */ { NULL, NULL, 0 },
 407 /* 0x39 */ { NULL, NULL, 0 },
 408 /* 0x3a */ { NULL, NULL, 0 },
 409 /* 0x3b */ { NULL, NULL, 0 },
 410 /* 0x3c */ { NULL, NULL, 0 },
 411 /* 0x3d */ { NULL, NULL, 0 },
 412 /* 0x3e */ { NULL, NULL, 0 },
 413 /* 0x3f */ { NULL, NULL, 0 },
 414 /* 0x40 */ { NULL, NULL, 0 },
 415 /* 0x41 */ { NULL, NULL, 0 },
 416 /* 0x42 */ { NULL, NULL, 0 },
 417 /* 0x43 */ { NULL, NULL, 0 },
 418 /* 0x44 */ { NULL, NULL, 0 },
 419 /* 0x45 */ { NULL, NULL, 0 },
 420 /* 0x46 */ { NULL, NULL, 0 },
 421 /* 0x47 */ { NULL, NULL, 0 },
 422 /* 0x48 */ { NULL, NULL, 0 },
 423 /* 0x49 */ { NULL, NULL, 0 },
 424 /* 0x4a */ { NULL, NULL, 0 },
 425 /* 0x4b */ { NULL, NULL, 0 },
 426 /* 0x4c */ { NULL, NULL, 0 },
 427 /* 0x4d */ { NULL, NULL, 0 },
 428 /* 0x4e */ { NULL, NULL, 0 },
 429 /* 0x4f */ { NULL, NULL, 0 },
 430 /* 0x50 */ { NULL, NULL, 0 },
 431 /* 0x51 */ { NULL, NULL, 0 },
 432 /* 0x52 */ { NULL, NULL, 0 },
 433 /* 0x53 */ { NULL, NULL, 0 },
 434 /* 0x54 */ { NULL, NULL, 0 },
 435 /* 0x55 */ { NULL, NULL, 0 },
 436 /* 0x56 */ { NULL, NULL, 0 },
 437 /* 0x57 */ { NULL, NULL, 0 },
 438 /* 0x58 */ { NULL, NULL, 0 },
 439 /* 0x59 */ { NULL, NULL, 0 },
 440 /* 0x5a */ { NULL, NULL, 0 },
 441 /* 0x5b */ { NULL, NULL, 0 },
 442 /* 0x5c */ { NULL, NULL, 0 },
 443 /* 0x5d */ { NULL, NULL, 0 },
 444 /* 0x5e */ { NULL, NULL, 0 },
 445 /* 0x5f */ { NULL, NULL, 0 },
 446 /* 0x60 */ { NULL, NULL, 0 },
 447 /* 0x61 */ { NULL, NULL, 0 },
 448 /* 0x62 */ { NULL, NULL, 0 },
 449 /* 0x63 */ { NULL, NULL, 0 },
 450 /* 0x64 */ { NULL, NULL, 0 },
 451 /* 0x65 */ { NULL, NULL, 0 },
 452 /* 0x66 */ { NULL, NULL, 0 },
 453 /* 0x67 */ { NULL, NULL, 0 },
 454 /* 0x68 */ { NULL, NULL, 0 },
 455 /* 0x69 */ { NULL, NULL, 0 },
 456 /* 0x6a */ { NULL, NULL, 0 },
 457 /* 0x6b */ { NULL, NULL, 0 },
 458 /* 0x6c */ { NULL, NULL, 0 },
 459 /* 0x6d */ { NULL, NULL, 0 },
 460 /* 0x6e */ { NULL, NULL, 0 },
 461 /* 0x6f */ { NULL, NULL, 0 },
 462 /* 0x70 */ { "SMBtcon",reply_tcon,0},
 463 /* 0x71 */ { "SMBtdis",reply_tdis,0},
 464 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
 465 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
 466 /* 0x74 */ { "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
 467 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
 468 /* 0x76 */ { NULL, NULL, 0 },
 469 /* 0x77 */ { NULL, NULL, 0 },
 470 /* 0x78 */ { NULL, NULL, 0 },
 471 /* 0x79 */ { NULL, NULL, 0 },
 472 /* 0x7a */ { NULL, NULL, 0 },
 473 /* 0x7b */ { NULL, NULL, 0 },
 474 /* 0x7c */ { NULL, NULL, 0 },
 475 /* 0x7d */ { NULL, NULL, 0 },
 476 /* 0x7e */ { NULL, NULL, 0 },
 477 /* 0x7f */ { NULL, NULL, 0 },
 478 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
 479 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
 480 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
 481 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
 482 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
 483 /* 0x85 */ { NULL, NULL, 0 },
 484 /* 0x86 */ { NULL, NULL, 0 },
 485 /* 0x87 */ { NULL, NULL, 0 },
 486 /* 0x88 */ { NULL, NULL, 0 },
 487 /* 0x89 */ { NULL, NULL, 0 },
 488 /* 0x8a */ { NULL, NULL, 0 },
 489 /* 0x8b */ { NULL, NULL, 0 },
 490 /* 0x8c */ { NULL, NULL, 0 },
 491 /* 0x8d */ { NULL, NULL, 0 },
 492 /* 0x8e */ { NULL, NULL, 0 },
 493 /* 0x8f */ { NULL, NULL, 0 },
 494 /* 0x90 */ { NULL, NULL, 0 },
 495 /* 0x91 */ { NULL, NULL, 0 },
 496 /* 0x92 */ { NULL, NULL, 0 },
 497 /* 0x93 */ { NULL, NULL, 0 },
 498 /* 0x94 */ { NULL, NULL, 0 },
 499 /* 0x95 */ { NULL, NULL, 0 },
 500 /* 0x96 */ { NULL, NULL, 0 },
 501 /* 0x97 */ { NULL, NULL, 0 },
 502 /* 0x98 */ { NULL, NULL, 0 },
 503 /* 0x99 */ { NULL, NULL, 0 },
 504 /* 0x9a */ { NULL, NULL, 0 },
 505 /* 0x9b */ { NULL, NULL, 0 },
 506 /* 0x9c */ { NULL, NULL, 0 },
 507 /* 0x9d */ { NULL, NULL, 0 },
 508 /* 0x9e */ { NULL, NULL, 0 },
 509 /* 0x9f */ { NULL, NULL, 0 },
 510 /* 0xa0 */ { "SMBnttrans", reply_nttrans, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
 511 /* 0xa1 */ { "SMBnttranss", reply_nttranss, AS_USER | CAN_IPC },
 512 /* 0xa2 */ { "SMBntcreateX", reply_ntcreate_and_X, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
 513 /* 0xa3 */ { NULL, NULL, 0 },
 514 /* 0xa4 */ { "SMBntcancel", reply_ntcancel, 0 },
 515 /* 0xa5 */ { NULL, NULL, 0 },
 516 /* 0xa6 */ { NULL, NULL, 0 },
 517 /* 0xa7 */ { NULL, NULL, 0 },
 518 /* 0xa8 */ { NULL, NULL, 0 },
 519 /* 0xa9 */ { NULL, NULL, 0 },
 520 /* 0xaa */ { NULL, NULL, 0 },
 521 /* 0xab */ { NULL, NULL, 0 },
 522 /* 0xac */ { NULL, NULL, 0 },
 523 /* 0xad */ { NULL, NULL, 0 },
 524 /* 0xae */ { NULL, NULL, 0 },
 525 /* 0xaf */ { NULL, NULL, 0 },
 526 /* 0xb0 */ { NULL, NULL, 0 },
 527 /* 0xb1 */ { NULL, NULL, 0 },
 528 /* 0xb2 */ { NULL, NULL, 0 },
 529 /* 0xb3 */ { NULL, NULL, 0 },
 530 /* 0xb4 */ { NULL, NULL, 0 },
 531 /* 0xb5 */ { NULL, NULL, 0 },
 532 /* 0xb6 */ { NULL, NULL, 0 },
 533 /* 0xb7 */ { NULL, NULL, 0 },
 534 /* 0xb8 */ { NULL, NULL, 0 },
 535 /* 0xb9 */ { NULL, NULL, 0 },
 536 /* 0xba */ { NULL, NULL, 0 },
 537 /* 0xbb */ { NULL, NULL, 0 },
 538 /* 0xbc */ { NULL, NULL, 0 },
 539 /* 0xbd */ { NULL, NULL, 0 },
 540 /* 0xbe */ { NULL, NULL, 0 },
 541 /* 0xbf */ { NULL, NULL, 0 },
 542 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER | QUEUE_IN_OPLOCK },
 543 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
 544 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
 545 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
 546 /* 0xc4 */ { NULL, NULL, 0 },
 547 /* 0xc5 */ { NULL, NULL, 0 },
 548 /* 0xc6 */ { NULL, NULL, 0 },
 549 /* 0xc7 */ { NULL, NULL, 0 },
 550 /* 0xc8 */ { NULL, NULL, 0 },
 551 /* 0xc9 */ { NULL, NULL, 0 },
 552 /* 0xca */ { NULL, NULL, 0 },
 553 /* 0xcb */ { NULL, NULL, 0 },
 554 /* 0xcc */ { NULL, NULL, 0 },
 555 /* 0xcd */ { NULL, NULL, 0 },
 556 /* 0xce */ { NULL, NULL, 0 },
 557 /* 0xcf */ { NULL, NULL, 0 },
 558 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
 559 /* 0xd1 */ { "SMBsendb",NULL,AS_GUEST},
 560 /* 0xd2 */ { "SMBfwdname",NULL,AS_GUEST},
 561 /* 0xd3 */ { "SMBcancelf",NULL,AS_GUEST},
 562 /* 0xd4 */ { "SMBgetmac",NULL,AS_GUEST},
 563 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
 564 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
 565 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
 566 /* 0xd8 */ { NULL, NULL, 0 },
 567 /* 0xd9 */ { NULL, NULL, 0 },
 568 /* 0xda */ { NULL, NULL, 0 },
 569 /* 0xdb */ { NULL, NULL, 0 },
 570 /* 0xdc */ { NULL, NULL, 0 },
 571 /* 0xdd */ { NULL, NULL, 0 },
 572 /* 0xde */ { NULL, NULL, 0 },
 573 /* 0xdf */ { NULL, NULL, 0 },
 574 /* 0xe0 */ { NULL, NULL, 0 },
 575 /* 0xe1 */ { NULL, NULL, 0 },
 576 /* 0xe2 */ { NULL, NULL, 0 },
 577 /* 0xe3 */ { NULL, NULL, 0 },
 578 /* 0xe4 */ { NULL, NULL, 0 },
 579 /* 0xe5 */ { NULL, NULL, 0 },
 580 /* 0xe6 */ { NULL, NULL, 0 },
 581 /* 0xe7 */ { NULL, NULL, 0 },
 582 /* 0xe8 */ { NULL, NULL, 0 },
 583 /* 0xe9 */ { NULL, NULL, 0 },
 584 /* 0xea */ { NULL, NULL, 0 },
 585 /* 0xeb */ { NULL, NULL, 0 },
 586 /* 0xec */ { NULL, NULL, 0 },
 587 /* 0xed */ { NULL, NULL, 0 },
 588 /* 0xee */ { NULL, NULL, 0 },
 589 /* 0xef */ { NULL, NULL, 0 },
 590 /* 0xf0 */ { NULL, NULL, 0 },
 591 /* 0xf1 */ { NULL, NULL, 0 },
 592 /* 0xf2 */ { NULL, NULL, 0 },
 593 /* 0xf3 */ { NULL, NULL, 0 },
 594 /* 0xf4 */ { NULL, NULL, 0 },
 595 /* 0xf5 */ { NULL, NULL, 0 },
 596 /* 0xf6 */ { NULL, NULL, 0 },
 597 /* 0xf7 */ { NULL, NULL, 0 },
 598 /* 0xf8 */ { NULL, NULL, 0 },
 599 /* 0xf9 */ { NULL, NULL, 0 },
 600 /* 0xfa */ { NULL, NULL, 0 },
 601 /* 0xfb */ { NULL, NULL, 0 },
 602 /* 0xfc */ { NULL, NULL, 0 },
 603 /* 0xfd */ { NULL, NULL, 0 },
 604 /* 0xfe */ { NULL, NULL, 0 },
 605 /* 0xff */ { NULL, NULL, 0 }
 606
 607 };
 608
 609 /*******************************************************************
 610  Dump a packet to a file.
 611 ********************************************************************/
 612
 613 static void smb_dump(const char *name, int type, char *data, ssize_t len)
 614 {
 615         int fd, i;
 616         pstring fname;
 617         if (DEBUGLEVEL < 50) return;
 618
 619         if (len < 4) len = smb_len(data)+4;
 620         for (i=1;i<100;i++) {
 621                 slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.%s", name, i,
 622                                 type ? "req" : "resp");
 623                 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
 624                 if (fd != -1 || errno != EEXIST) break;
 625         }
 626         if (fd != -1) {
 627                 ssize_t ret = write(fd, data, len);
 628                 if (ret != len)
 629                         DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
 630                 close(fd);
 631                 DEBUG(0,("created %s len %d\n", fname, len));
 632         }
 633 }
 634
 635
 636 /****************************************************************************
 637  Do a switch on the message type, and return the response size
 638 ****************************************************************************/
 639
 640 static int switch_message(int type,char *inbuf,char *outbuf,int size,int bufsize)
 641 {
 642         static pid_t pid= (pid_t)-1;
 643         int outsize = 0;
 644         extern uint16 global_smbpid;
 645
 646         type &= 0xff;
 647
 648         if (pid == (pid_t)-1)
 649                 pid = sys_getpid();
 650
 651         errno = 0;
 652         last_message = type;
 653
 654         /* Make sure this is an SMB packet. smb_size contains NetBIOS header so subtract 4 from it. */
 655         if ((strncmp(smb_base(inbuf),"\377SMB",4) != 0) || (size < (smb_size - 4))) {
 656                 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",smb_len(inbuf)));
 657                 exit_server("Non-SMB packet");
 658                 return(-1);
 659         }
 660
 661         /* yuck! this is an interim measure before we get rid of our
 662                 current inbuf/outbuf system */
 663         global_smbpid = SVAL(inbuf,smb_pid);
 664
 665         if (smb_messages[type].fn == NULL) {
 666                 DEBUG(0,("Unknown message type %d!\n",type));
 667                 smb_dump("Unknown", 1, inbuf, size);
 668                 outsize = reply_unknown(inbuf,outbuf);
 669         } else {
 670                 int flags = smb_messages[type].flags;
 671                 static uint16 last_session_tag = UID_FIELD_INVALID;
 672                 /* In share mode security we must ignore the vuid. */
 673                 uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
 674                 connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
 675
 676                 DEBUG(3,("switch message %s (pid %d)\n",smb_fn_name(type),(int)pid));
 677
 678                 smb_dump(smb_fn_name(type), 1, inbuf, size);
 679                 if(global_oplock_break) {
 680                         if(flags & QUEUE_IN_OPLOCK) {
 681                                 /*
 682                                  * Queue this message as we are the process of an oplock break.
 683                                  */
 684
 685                                 DEBUG( 2, ( "switch_message: queueing message due to being in " ) );
 686                                 DEBUGADD( 2, ( "oplock break state.\n" ) );
 687
 688                                 push_oplock_pending_smb_message( inbuf, size );
 689                                 return -1;
 690                         }
 691                 }
 692
 693                 /* Ensure this value is replaced in the incoming packet. */
 694                 SSVAL(inbuf,smb_uid,session_tag);
 695
 696                 /*
 697                  * Ensure the correct username is in current_user_info.
 698                  * This is a really ugly bugfix for problems with
 699                  * multiple session_setup_and_X's being done and
 700                  * allowing %U and %G substitutions to work correctly.
 701                  * There is a reason this code is done here, don't
 702                  * move it unless you know what you're doing... :-).
 703                  * JRA.
 704                  */
 705
 706                 if (session_tag != last_session_tag) {
 707                         user_struct *vuser = NULL;
 708
 709                         last_session_tag = session_tag;
 710                         if(session_tag != UID_FIELD_INVALID)
 711                                 vuser = get_valid_user_struct(session_tag);
 712                         if(vuser != NULL)
 713                                 current_user_info = vuser->user;
 714                 }
 715
 716                 /* does this protocol need to be run as root? */
 717                 if (!(flags & AS_USER))
 718                         change_to_root_user();
 719
 720                 /* does this protocol need a valid tree connection? */
 721                 if ((flags & AS_USER) && !conn)
 722                         return ERROR_DOS(ERRSRV, ERRinvnid);
 723
 724
 725                 /* does this protocol need to be run as the connected user? */
 726                 if ((flags & AS_USER) && !change_to_user(conn,session_tag)) {
 727                         if (flags & AS_GUEST)
 728                                 flags &= ~AS_USER;
 729                         else
 730                                 return(ERROR_DOS(ERRSRV,ERRaccess));
 731                 }
 732
 733                 /* this code is to work around a bug is MS client 3 without
 734                         introducing a security hole - it needs to be able to do
 735                         print queue checks as guest if it isn't logged in properly */
 736                 if (flags & AS_USER)
 737                         flags &= ~AS_GUEST;
 738
 739                 /* does it need write permission? */
 740                 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
 741                         return(ERROR_DOS(ERRSRV,ERRaccess));
 742
 743                 /* ipc services are limited */
 744                 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC))
 745                         return(ERROR_DOS(ERRSRV,ERRaccess));
 746
 747                 /* load service specific parameters */
 748                 if (conn && !set_current_service(conn,(flags & AS_USER)?True:False))
 749                         return(ERROR_DOS(ERRSRV,ERRaccess));
 750
 751                 /* does this protocol need to be run as guest? */
 752                 if ((flags & AS_GUEST) && (!change_to_guest() ||
 753                                 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))))
 754                         return(ERROR_DOS(ERRSRV,ERRaccess));
 755
 756                 last_inbuf = inbuf;
 757
 758                 outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
 759         }
 760
 761         smb_dump(smb_fn_name(type), 0, outbuf, outsize);
 762
 763         return(outsize);
 764 }
 765
 766
 767 /****************************************************************************
 768  Construct a reply to the incoming packet.
 769 ****************************************************************************/
 770
 771 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
 772 {
 773         int type = CVAL(inbuf,smb_com);
 774         int outsize = 0;
 775         int msg_type = CVAL(inbuf,0);
 776
 777         GetTimeOfDay(&smb_last_time);
 778
 779         chain_size = 0;
 780         file_chain_reset();
 781         reset_chain_p();
 782
 783         if (msg_type != 0)
 784                 return(reply_special(inbuf,outbuf));
 785
 786         construct_reply_common(inbuf, outbuf);
 787
 788         outsize = switch_message(type,inbuf,outbuf,size,bufsize);
 789
 790         outsize += chain_size;
 791
 792         if(outsize > 4)
 793                 smb_setlen(outbuf,outsize - 4);
 794         return(outsize);
 795 }
 796
 797 /****************************************************************************
 798  Keep track of the number of running smbd's. This functionality is used to
 799  'hard' limit Samba overhead on resource constrained systems.
 800 ****************************************************************************/
 801
 802 static BOOL process_count_update_successful = False;
 803
 804 static int32 increment_smbd_process_count(void)
 805 {
 806         int32 total_smbds;
 807
 808         if (lp_max_smbd_processes()) {
 809                 total_smbds = 0;
 810                 if (tdb_change_int32_atomic(conn_tdb_ctx(), "INFO/total_smbds", &total_smbds, 1) == -1)
 811                         return 1;
 812                 process_count_update_successful = True;
 813                 return total_smbds + 1;
 814         }
 815         return 1;
 816 }
 817
 818 void decrement_smbd_process_count(void)
 819 {
 820         int32 total_smbds;
 821
 822         if (lp_max_smbd_processes() && process_count_update_successful) {
 823                 total_smbds = 1;
 824                 tdb_change_int32_atomic(conn_tdb_ctx(), "INFO/total_smbds", &total_smbds, -1);
 825         }
 826 }
 827
 828 static BOOL smbd_process_limit(void)
 829 {
 830         int32  total_smbds;
 831
 832         if (lp_max_smbd_processes()) {
 833
 834                 /* Always add one to the smbd process count, as exit_server() always
 835                  * subtracts one.
 836                  */
 837
 838                 if (!conn_tdb_ctx()) {
 839                         DEBUG(0,("smbd_process_limit: max smbd processes parameter set with status parameter not \
 840 set. Ignoring max smbd restriction.\n"));
 841                         return False;
 842                 }
 843
 844                 total_smbds = increment_smbd_process_count();
 845                 return total_smbds > lp_max_smbd_processes();
 846         }
 847         else
 848                 return False;
 849 }
 850
 851 /****************************************************************************
 852   process an smb from the client - split out from the smbd_process() code so
 853   it can be used by the oplock break code.
 854 ****************************************************************************/
 855 void process_smb(char *inbuf, char *outbuf)
 856 {
 857   static int trans_num;
 858   int msg_type = CVAL(inbuf,0);
 859   int32 len = smb_len(inbuf);
 860   int nread = len + 4;
 861
 862   DO_PROFILE_INC(smb_count);
 863
 864   if (trans_num == 0) {
 865           /* on the first packet, check the global hosts allow/ hosts
 866              deny parameters before doing any parsing of the packet
 867              passed to us by the client.  This prevents attacks on our
 868              parsing code from hosts not in the hosts allow list */
 869           if (smbd_process_limit() ||
 870                   !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
 871                   /* send a negative session response "not listening on calling
 872                    name" */
 873                   static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
 874                   DEBUG( 1, ( "Connection denied from %s\n",
 875                               client_addr() ) );
 876                   (void)send_smb(smbd_server_fd(),(char *)buf);
 877                   exit_server("connection denied");
 878           }
 879   }
 880
 881   DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
 882   DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
 883
 884   if (msg_type == 0)
 885     show_msg(inbuf);
 886   else if(msg_type == SMBkeepalive)
 887     return; /* Keepalive packet. */
 888
 889   nread = construct_reply(inbuf,outbuf,nread,max_send);
 890
 891   if(nread > 0)
 892   {
 893     if (CVAL(outbuf,0) == 0)
 894       show_msg(outbuf);
 895
 896     if (nread != smb_len(outbuf) + 4)
 897     {
 898       DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
 899                  nread, smb_len(outbuf)));
 900     }
 901     else
 902       if (!send_smb(smbd_server_fd(),outbuf))
 903         exit_server("process_smb: send_smb failed.");
 904   }
 905   trans_num++;
 906 }
 907
 908
 909
 910 /****************************************************************************
 911 return a string containing the function name of a SMB command
 912 ****************************************************************************/
 913 const char *smb_fn_name(int type)
 914 {
 915         const char *unknown_name = "SMBunknown";
 916
 917         if (smb_messages[type].name == NULL)
 918                 return(unknown_name);
 919
 920         return(smb_messages[type].name);
 921 }
 922
 923
 924 /****************************************************************************
 925  Helper function for contruct_reply.
 926 ****************************************************************************/
 927
 928 void construct_reply_common(char *inbuf,char *outbuf)
 929 {
 930         memset(outbuf,'\0',smb_size);
 931
 932         set_message(outbuf,0,0,True);
 933         SCVAL(outbuf,smb_com,CVAL(inbuf,smb_com));
 934
 935         memcpy(outbuf+4,inbuf+4,4);
 936         SCVAL(outbuf,smb_rcls,SMB_SUCCESS);
 937         SCVAL(outbuf,smb_reh,0);
 938         SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
 939         SSVAL(outbuf,smb_flg2,
 940               (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
 941               FLAGS2_LONG_PATH_COMPONENTS |
 942               FLAGS2_32_BIT_ERROR_CODES | FLAGS2_EXTENDED_SECURITY);
 943
 944         SSVAL(outbuf,smb_err,SMB_SUCCESS);
 945         SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
 946         SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
 947         SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
 948         SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
 949 }
 950
 951 /****************************************************************************
 952   construct a chained reply and add it to the already made reply
 953   **************************************************************************/
 954 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
 955 {
 956   static char *orig_inbuf;
 957   static char *orig_outbuf;
 958   int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
 959   unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
 960   char *inbuf2, *outbuf2;
 961   int outsize2;
 962   char inbuf_saved[smb_wct];
 963   char outbuf_saved[smb_wct];
 964   int wct = CVAL(outbuf,smb_wct);
 965   int outsize = smb_size + 2*wct + SVAL(outbuf,smb_vwv0+2*wct);
 966
 967   /* maybe its not chained */
 968   if (smb_com2 == 0xFF) {
 969     SCVAL(outbuf,smb_vwv0,0xFF);
 970     return outsize;
 971   }
 972
 973   if (chain_size == 0) {
 974     /* this is the first part of the chain */
 975     orig_inbuf = inbuf;
 976     orig_outbuf = outbuf;
 977   }
 978
 979   /*
 980    * The original Win95 redirector dies on a reply to
 981    * a lockingX and read chain unless the chain reply is
 982    * 4 byte aligned. JRA.
 983    */
 984
 985   outsize = (outsize + 3) & ~3;
 986
 987   /* we need to tell the client where the next part of the reply will be */
 988   SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
 989   SCVAL(outbuf,smb_vwv0,smb_com2);
 990
 991   /* remember how much the caller added to the chain, only counting stuff
 992      after the parameter words */
 993   chain_size += outsize - smb_wct;
 994
 995   /* work out pointers into the original packets. The
 996      headers on these need to be filled in */
 997   inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
 998   outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
 999
1000   /* remember the original command type */
1001   smb_com1 = CVAL(orig_inbuf,smb_com);
1002
1003   /* save the data which will be overwritten by the new headers */
1004   memcpy(inbuf_saved,inbuf2,smb_wct);
1005   memcpy(outbuf_saved,outbuf2,smb_wct);
1006
1007   /* give the new packet the same header as the last part of the SMB */
1008   memmove(inbuf2,inbuf,smb_wct);
1009
1010   /* create the in buffer */
1011   SCVAL(inbuf2,smb_com,smb_com2);
1012
1013   /* create the out buffer */
1014   construct_reply_common(inbuf2, outbuf2);
1015
1016   DEBUG(3,("Chained message\n"));
1017   show_msg(inbuf2);
1018
1019   /* process the request */
1020   outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
1021                             bufsize-chain_size);
1022
1023   /* copy the new reply and request headers over the old ones, but
1024      preserve the smb_com field */
1025   memmove(orig_outbuf,outbuf2,smb_wct);
1026   SCVAL(orig_outbuf,smb_com,smb_com1);
1027
1028   /* restore the saved data, being careful not to overwrite any
1029    data from the reply header */
1030   memcpy(inbuf2,inbuf_saved,smb_wct);
1031   {
1032     int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
1033     if (ofs < 0) ofs = 0;
1034     memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
1035   }
1036
1037   return outsize2;
1038 }
1039
1040 /****************************************************************************
1041  Setup the needed select timeout.
1042 ****************************************************************************/
1043
1044 static int setup_select_timeout(void)
1045 {
1046         int select_timeout;
1047         int t;
1048
1049         select_timeout = blocking_locks_timeout(SMBD_SELECT_TIMEOUT);
1050         select_timeout *= 1000;
1051
1052         t = change_notify_timeout();
1053         if (t != -1)
1054                 select_timeout = MIN(select_timeout, t*1000);
1055
1056         if (print_notify_messages_pending())
1057                 select_timeout = MIN(select_timeout, 1000);
1058
1059         return select_timeout;
1060 }
1061
1062 /****************************************************************************
1063  Check if services need reloading.
1064 ****************************************************************************/
1065
1066 void check_reload(int t)
1067 {
1068   static time_t last_smb_conf_reload_time = 0;
1069
1070   if(last_smb_conf_reload_time == 0)
1071     last_smb_conf_reload_time = t;
1072
1073   if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK))
1074   {
1075     reload_services(True);
1076     reload_after_sighup = False;
1077     last_smb_conf_reload_time = t;
1078   }
1079 }
1080
1081 /****************************************************************************
1082  Process any timeout housekeeping. Return False if the caller should exit.
1083 ****************************************************************************/
1084
1085 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
1086 {
1087   static time_t last_keepalive_sent_time = 0;
1088   static time_t last_idle_closed_check = 0;
1089   time_t t;
1090   BOOL allidle = True;
1091   extern int keepalive;
1092
1093   if (smb_read_error == READ_EOF)
1094   {
1095     DEBUG(3,("end of file from client\n"));
1096     return False;
1097   }
1098
1099   if (smb_read_error == READ_ERROR)
1100   {
1101     DEBUG(3,("receive_smb error (%s) exiting\n",
1102               strerror(errno)));
1103     return False;
1104   }
1105
1106   *last_timeout_processing_time = t = time(NULL);
1107
1108   if(last_keepalive_sent_time == 0)
1109     last_keepalive_sent_time = t;
1110
1111   if(last_idle_closed_check == 0)
1112     last_idle_closed_check = t;
1113
1114   /* become root again if waiting */
1115   change_to_root_user();
1116
1117   /* run all registered idle events */
1118   smb_run_idle_events(t);
1119
1120   /* check if we need to reload services */
1121   check_reload(t);
1122
1123   /* automatic timeout if all connections are closed */
1124   if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT)
1125   {
1126     DEBUG( 2, ( "Closing idle connection\n" ) );
1127     return False;
1128   }
1129   else
1130     last_idle_closed_check = t;
1131
1132   if (keepalive && (t - last_keepalive_sent_time)>keepalive)
1133   {
1134           extern struct auth_context *negprot_global_auth_context;
1135           if (!send_keepalive(smbd_server_fd())) {
1136                   DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1137                   return False;
1138           }
1139
1140           /* send a keepalive for a password server or the like.
1141              This is attached to the auth_info created in the
1142              negprot */
1143           if (negprot_global_auth_context
1144               && negprot_global_auth_context->challenge_set_method
1145               && negprot_global_auth_context->challenge_set_method->send_keepalive) {
1146                   negprot_global_auth_context->challenge_set_method->send_keepalive
1147                           (&negprot_global_auth_context->challenge_set_method->private_data);
1148           }
1149
1150           last_keepalive_sent_time = t;
1151   }
1152
1153   /* check for connection timeouts */
1154   allidle = conn_idle_all(t, deadtime);
1155
1156   if (allidle && conn_num_open()>0) {
1157     DEBUG(2,("Closing idle connection 2.\n"));
1158     return False;
1159   }
1160
1161   if(global_machine_password_needs_changing &&
1162      /* for ADS we need to do a regular ADS password change, not a domain
1163         password change */
1164      lp_security() == SEC_DOMAIN)
1165   {
1166     unsigned char trust_passwd_hash[16];
1167     time_t lct;
1168
1169     /*
1170      * We're in domain level security, and the code that
1171      * read the machine password flagged that the machine
1172      * password needs changing.
1173      */
1174
1175     /*
1176      * First, open the machine password file with an exclusive lock.
1177      */
1178
1179     if (secrets_lock_trust_account_password(lp_workgroup(), True) == False) {
1180       DEBUG(0,("process: unable to lock the machine account password for \
1181 machine %s in domain %s.\n", global_myname(), lp_workgroup() ));
1182       return True;
1183     }
1184
1185     if(!secrets_fetch_trust_account_password(lp_workgroup(),
1186                                              trust_passwd_hash,
1187                                              &lct, NULL)) {
1188       DEBUG(0,("process: unable to read the machine account password for \
1189 machine %s in domain %s.\n", global_myname(), lp_workgroup()));
1190       secrets_lock_trust_account_password(lp_workgroup(), False);
1191       return True;
1192     }
1193
1194     /*
1195      * Make sure someone else hasn't already done this.
1196      */
1197
1198     if(t < lct + lp_machine_password_timeout()) {
1199       global_machine_password_needs_changing = False;
1200       secrets_lock_trust_account_password(lp_workgroup(), False);
1201       return True;
1202     }
1203
1204     /* always just contact the PDC here */
1205
1206     change_trust_account_password( lp_workgroup(), NULL);
1207     global_machine_password_needs_changing = False;
1208     secrets_lock_trust_account_password(lp_workgroup(), False);
1209   }
1210
1211   /*
1212    * Check to see if we have any blocking locks
1213    * outstanding on the queue.
1214    */
1215   process_blocking_lock_queue(t);
1216
1217   /* update printer queue caches if necessary */
1218
1219   update_monitored_printq_cache();
1220
1221   /*
1222    * Check to see if we have any change notifies
1223    * outstanding on the queue.
1224    */
1225   process_pending_change_notify_queue(t);
1226
1227   /*
1228    * Now we are root, check if the log files need pruning.
1229    * Force a log file check.
1230    */
1231   force_check_log_size();
1232   check_log_size();
1233
1234   /* Send any queued printer notify message to interested smbd's. */
1235
1236   print_notify_send_messages(0);
1237
1238   /*
1239    * Modify the select timeout depending upon
1240    * what we have remaining in our queues.
1241    */
1242
1243   *select_timeout = setup_select_timeout();
1244
1245   return True;
1246 }
1247
1248 /****************************************************************************
1249   process commands from the client
1250 ****************************************************************************/
1251
1252 void smbd_process(void)
1253 {
1254         extern int smb_echo_count;
1255         time_t last_timeout_processing_time = time(NULL);
1256         unsigned int num_smbs = 0;
1257         const size_t total_buffer_size = BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN;
1258
1259         InBuffer = (char *)malloc(total_buffer_size);
1260         OutBuffer = (char *)malloc(total_buffer_size);
1261         if ((InBuffer == NULL) || (OutBuffer == NULL))
1262                 return;
1263
1264         clobber_region(SAFE_STRING_FUNCTION_NAME, SAFE_STRING_LINE, InBuffer, total_buffer_size);
1265         clobber_region(SAFE_STRING_FUNCTION_NAME, SAFE_STRING_LINE, OutBuffer, total_buffer_size);
1266
1267         max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1268
1269         while (True) {
1270                 int deadtime = lp_deadtime()*60;
1271                 int select_timeout = setup_select_timeout();
1272                 int num_echos;
1273
1274                 if (deadtime <= 0)
1275                         deadtime = DEFAULT_SMBD_TIMEOUT;
1276
1277                 errno = 0;
1278
1279                 /* free up temporary memory */
1280                 lp_talloc_free();
1281                 main_loop_talloc_free();
1282
1283                 /* run all registered idle events */
1284                 smb_run_idle_events(time(NULL));
1285
1286
1287                 /* Did someone ask for immediate checks on things like blocking locks ? */
1288                 if (select_timeout == 0) {
1289                         if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1290                                 return;
1291                         num_smbs = 0; /* Reset smb counter. */
1292                 }
1293
1294                 clobber_region(SAFE_STRING_FUNCTION_NAME, SAFE_STRING_LINE, InBuffer, total_buffer_size);
1295
1296                 while (!receive_message_or_smb(InBuffer,BUFFER_SIZE+LARGE_WRITEX_HDR_SIZE,select_timeout)) {
1297                         if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1298                                 return;
1299                         num_smbs = 0; /* Reset smb counter. */
1300                 }
1301
1302                 /*
1303                  * Ensure we do timeout processing if the SMB we just got was
1304                  * only an echo request. This allows us to set the select
1305                  * timeout in 'receive_message_or_smb()' to any value we like
1306                  * without worrying that the client will send echo requests
1307                  * faster than the select timeout, thus starving out the
1308                  * essential processing (change notify, blocking locks) that
1309                  * the timeout code does. JRA.
1310                  */
1311                 num_echos = smb_echo_count;
1312
1313                 clobber_region(SAFE_STRING_FUNCTION_NAME, SAFE_STRING_LINE, OutBuffer, total_buffer_size);
1314
1315                 process_smb(InBuffer, OutBuffer);
1316
1317                 if (smb_echo_count != num_echos) {
1318                         if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1319                                 return;
1320                         num_smbs = 0; /* Reset smb counter. */
1321                 }
1322
1323                 num_smbs++;
1324
1325                 /*
1326                  * If we are getting smb requests in a constant stream
1327                  * with no echos, make sure we attempt timeout processing
1328                  * every select_timeout milliseconds - but only check for this
1329                  * every 200 smb requests.
1330                  */
1331
1332                 if ((num_smbs % 200) == 0) {
1333                         time_t new_check_time = time(NULL);
1334                         if(new_check_time - last_timeout_processing_time >= (select_timeout/1000)) {
1335                                 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1336                                         return;
1337                                 num_smbs = 0; /* Reset smb counter. */
1338                                 last_timeout_processing_time = new_check_time; /* Reset time. */
1339                         }
1340                 }
1341
1342                 /* The timeout_processing function isn't run nearly
1343                    often enough to implement 'max log size' without
1344                    overrunning the size of the file by many megabytes.
1345                    This is especially true if we are running at debug
1346                    level 10.  Checking every 50 SMBs is a nice
1347                    tradeoff of performance vs log file size overrun. */
1348
1349                 if ((num_smbs % 50) == 0 && need_to_check_log_size()) {
1350                         change_to_root_user();
1351                         check_log_size();
1352                 }
1353         }
1354 }