source3/printing/notify.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    printing backend routines
   5    Copyright (C) Tim Potter, 2002
   6    Copyright (C) Gerald Carter,         2002
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "printing.h"
  24 #include "../librpc/gen_ndr/spoolss.h"
  25 #include "nt_printing.h"
  26 #include "printing/notify.h"
  27 #include "messages.h"
  28 #include "util_tdb.h"
  29
  30 static TALLOC_CTX *send_ctx;
  31
  32 static unsigned int num_messages;
  33
  34 static struct notify_queue {
  35         struct notify_queue *next, *prev;
  36         struct spoolss_notify_msg *msg;
  37         struct timeval tv;
  38         uint8 *buf;
  39         size_t buflen;
  40 } *notify_queue_head = NULL;
  41
  42 static struct tevent_timer *notify_event;
  43
  44 static bool print_notify_pid_list(const char *printername, TALLOC_CTX *mem_ctx,
  45                                   size_t *p_num_pids, pid_t **pp_pid_list);
  46
  47 static bool create_send_ctx(void)
  48 {
  49         if (!send_ctx)
  50                 send_ctx = talloc_init("print notify queue");
  51
  52         if (!send_ctx)
  53                 return False;
  54
  55         return True;
  56 }
  57
  58 /****************************************************************************
  59  Turn a queue name into a snum.
  60 ****************************************************************************/
  61
  62 int print_queue_snum(const char *qname)
  63 {
  64         int snum = lp_servicenumber(qname);
  65         if (snum == -1 || !lp_print_ok(snum))
  66                 return -1;
  67         return snum;
  68 }
  69
  70 /*******************************************************************
  71  Used to decide if we need a short select timeout.
  72 *******************************************************************/
  73
  74 static bool print_notify_messages_pending(void)
  75 {
  76         return (notify_queue_head != NULL);
  77 }
  78
  79 /*******************************************************************
  80  Flatten data into a message.
  81 *******************************************************************/
  82
  83 static bool flatten_message(struct notify_queue *q)
  84 {
  85         struct spoolss_notify_msg *msg = q->msg;
  86         uint8 *buf = NULL;
  87         size_t buflen = 0, len;
  88
  89 again:
  90         len = 0;
  91
  92         /* Pack header */
  93
  94         len += tdb_pack(buf + len, buflen - len, "f", msg->printer);
  95
  96         len += tdb_pack(buf + len, buflen - len, "ddddddd",
  97                         (uint32)q->tv.tv_sec, (uint32)q->tv.tv_usec,
  98                         msg->type, msg->field, msg->id, msg->len, msg->flags);
  99
 100         /* Pack data */
 101
 102         if (msg->len == 0)
 103                 len += tdb_pack(buf + len, buflen - len, "dd",
 104                                 msg->notify.value[0], msg->notify.value[1]);
 105         else
 106                 len += tdb_pack(buf + len, buflen - len, "B",
 107                                 msg->len, msg->notify.data);
 108
 109         if (buflen != len) {
 110                 buf = (uint8 *)TALLOC_REALLOC(send_ctx, buf, len);
 111                 if (!buf)
 112                         return False;
 113                 buflen = len;
 114                 goto again;
 115         }
 116
 117         q->buf = buf;
 118         q->buflen = buflen;
 119
 120         return True;
 121 }
 122
 123 /*******************************************************************
 124  Send the batched messages - on a per-printer basis.
 125 *******************************************************************/
 126
 127 static void print_notify_send_messages_to_printer(struct messaging_context *msg_ctx,
 128                                                   const char *printer,
 129                                                   unsigned int timeout)
 130 {
 131         char *buf;
 132         struct notify_queue *pq, *pq_next;
 133         size_t msg_count = 0, offset = 0;
 134         size_t num_pids = 0;
 135         size_t i;
 136         pid_t *pid_list = NULL;
 137         struct timeval end_time = timeval_zero();
 138
 139         /* Count the space needed to send the messages. */
 140         for (pq = notify_queue_head; pq; pq = pq->next) {
 141                 if (strequal(printer, pq->msg->printer)) {
 142                         if (!flatten_message(pq)) {
 143                                 DEBUG(0,("print_notify_send_messages: Out of memory\n"));
 144                                 talloc_free_children(send_ctx);
 145                                 num_messages = 0;
 146                                 return;
 147                         }
 148                         offset += (pq->buflen + 4);
 149                         msg_count++;
 150                 }
 151         }
 152         offset += 4; /* For count. */
 153
 154         buf = (char *)TALLOC(send_ctx, offset);
 155         if (!buf) {
 156                 DEBUG(0,("print_notify_send_messages: Out of memory\n"));
 157                 talloc_free_children(send_ctx);
 158                 num_messages = 0;
 159                 return;
 160         }
 161
 162         offset = 0;
 163         SIVAL(buf,offset,msg_count);
 164         offset += 4;
 165         for (pq = notify_queue_head; pq; pq = pq_next) {
 166                 pq_next = pq->next;
 167
 168                 if (strequal(printer, pq->msg->printer)) {
 169                         SIVAL(buf,offset,pq->buflen);
 170                         offset += 4;
 171                         memcpy(buf + offset, pq->buf, pq->buflen);
 172                         offset += pq->buflen;
 173
 174                         /* Remove from list. */
 175                         DLIST_REMOVE(notify_queue_head, pq);
 176                 }
 177         }
 178
 179         DEBUG(5, ("print_notify_send_messages_to_printer: sending %lu print notify message%s to printer %s\n",
 180                   (unsigned long)msg_count, msg_count != 1 ? "s" : "", printer));
 181
 182         /*
 183          * Get the list of PID's to send to.
 184          */
 185
 186         if (!print_notify_pid_list(printer, send_ctx, &num_pids, &pid_list))
 187                 return;
 188
 189         if (timeout != 0) {
 190                 end_time = timeval_current_ofs(timeout, 0);
 191         }
 192
 193         for (i = 0; i < num_pids; i++) {
 194                 messaging_send_buf(msg_ctx,
 195                                    pid_to_procid(pid_list[i]),
 196                                    MSG_PRINTER_NOTIFY2 | MSG_FLAG_LOWPRIORITY,
 197                                    (uint8 *)buf, offset);
 198
 199                 if ((timeout != 0) && timeval_expired(&end_time)) {
 200                         break;
 201                 }
 202         }
 203 }
 204
 205 /*******************************************************************
 206  Actually send the batched messages.
 207 *******************************************************************/
 208
 209 void print_notify_send_messages(struct messaging_context *msg_ctx,
 210                                 unsigned int timeout)
 211 {
 212         if (!print_notify_messages_pending())
 213                 return;
 214
 215         if (!create_send_ctx())
 216                 return;
 217
 218         while (print_notify_messages_pending())
 219                 print_notify_send_messages_to_printer(
 220                         msg_ctx, notify_queue_head->msg->printer, timeout);
 221
 222         talloc_free_children(send_ctx);
 223         num_messages = 0;
 224 }
 225
 226 /*******************************************************************
 227  Event handler to send the messages.
 228 *******************************************************************/
 229
 230 static void print_notify_event_send_messages(struct tevent_context *event_ctx,
 231                                              struct tevent_timer *te,
 232                                              struct timeval now,
 233                                              void *private_data)
 234 {
 235         struct messaging_context *msg_ctx = talloc_get_type_abort(
 236                 private_data, struct messaging_context);
 237         /* Remove this timed event handler. */
 238         TALLOC_FREE(notify_event);
 239
 240         change_to_root_user();
 241         print_notify_send_messages(msg_ctx, 0);
 242 }
 243
 244 /**********************************************************************
 245  deep copy a SPOOLSS_NOTIFY_MSG structure using a TALLOC_CTX
 246  *********************************************************************/
 247
 248 static bool copy_notify2_msg( SPOOLSS_NOTIFY_MSG *to, SPOOLSS_NOTIFY_MSG *from )
 249 {
 250
 251         if ( !to || !from )
 252                 return False;
 253
 254         memcpy( to, from, sizeof(SPOOLSS_NOTIFY_MSG) );
 255
 256         if ( from->len ) {
 257                 to->notify.data = (char *)talloc_memdup(send_ctx, from->notify.data, from->len );
 258                 if ( !to->notify.data ) {
 259                         DEBUG(0,("copy_notify2_msg: talloc_memdup() of size [%d] failed!\n", from->len ));
 260                         return False;
 261                 }
 262         }
 263
 264
 265         return True;
 266 }
 267
 268 /*******************************************************************
 269  Batch up print notify messages.
 270 *******************************************************************/
 271
 272 static void send_spoolss_notify2_msg(struct tevent_context *ev,
 273                                      struct messaging_context *msg_ctx,
 274                                      SPOOLSS_NOTIFY_MSG *msg)
 275 {
 276         struct notify_queue *pnqueue, *tmp_ptr;
 277
 278         /*
 279          * Ensure we only have one job total_bytes and job total_pages for
 280          * each job. There is no point in sending multiple messages that match
 281          * as they will just cause flickering updates in the client.
 282          */
 283
 284         if ((num_messages < 100) && (msg->type == JOB_NOTIFY_TYPE)
 285                 && (msg->field == JOB_NOTIFY_FIELD_TOTAL_BYTES
 286                     || msg->field == JOB_NOTIFY_FIELD_TOTAL_PAGES ))
 287         {
 288
 289                 for (tmp_ptr = notify_queue_head; tmp_ptr; tmp_ptr = tmp_ptr->next)
 290                 {
 291                         if (tmp_ptr->msg->type == msg->type &&
 292                                         tmp_ptr->msg->field == msg->field &&
 293                                         tmp_ptr->msg->id == msg->id &&
 294                                         tmp_ptr->msg->flags == msg->flags &&
 295                                         strequal(tmp_ptr->msg->printer, msg->printer)) {
 296
 297                                 DEBUG(5,("send_spoolss_notify2_msg: replacing message 0x%02x/0x%02x for "
 298                                          "printer %s in notify_queue\n", msg->type, msg->field, msg->printer));
 299
 300                                 tmp_ptr->msg = msg;
 301                                 return;
 302                         }
 303                 }
 304         }
 305
 306         /* Store the message on the pending queue. */
 307
 308         pnqueue = talloc(send_ctx, struct notify_queue);
 309         if (!pnqueue) {
 310                 DEBUG(0,("send_spoolss_notify2_msg: Out of memory.\n"));
 311                 return;
 312         }
 313
 314         /* allocate a new msg structure and copy the fields */
 315
 316         if ( !(pnqueue->msg = talloc(send_ctx, SPOOLSS_NOTIFY_MSG)) ) {
 317                 DEBUG(0,("send_spoolss_notify2_msg: talloc() of size [%lu] failed!\n",
 318                         (unsigned long)sizeof(SPOOLSS_NOTIFY_MSG)));
 319                 return;
 320         }
 321         copy_notify2_msg(pnqueue->msg, msg);
 322         GetTimeOfDay(&pnqueue->tv);
 323         pnqueue->buf = NULL;
 324         pnqueue->buflen = 0;
 325
 326         DEBUG(5, ("send_spoolss_notify2_msg: appending message 0x%02x/0x%02x for printer %s \
 327 to notify_queue_head\n", msg->type, msg->field, msg->printer));
 328
 329         /*
 330          * Note we add to the end of the list to ensure
 331          * the messages are sent in the order they were received. JRA.
 332          */
 333
 334         DLIST_ADD_END(notify_queue_head, pnqueue, struct notify_queue *);
 335         num_messages++;
 336
 337         if ((notify_event == NULL) && (ev != NULL)) {
 338                 /* Add an event for 1 second's time to send this queue. */
 339                 notify_event = tevent_add_timer(
 340                         ev, NULL, timeval_current_ofs(1,0),
 341                         print_notify_event_send_messages, msg_ctx);
 342         }
 343
 344 }
 345
 346 static void send_notify_field_values(struct tevent_context *ev,
 347                                      struct messaging_context *msg_ctx,
 348                                      const char *sharename, uint32 type,
 349                                      uint32 field, uint32 id, uint32 value1,
 350                                      uint32 value2, uint32 flags)
 351 {
 352         struct spoolss_notify_msg *msg;
 353
 354         if (lp_disable_spoolss())
 355                 return;
 356
 357         if (!create_send_ctx())
 358                 return;
 359
 360         msg = talloc(send_ctx, struct spoolss_notify_msg);
 361         if (!msg)
 362                 return;
 363
 364         ZERO_STRUCTP(msg);
 365
 366         fstrcpy(msg->printer, sharename);
 367         msg->type = type;
 368         msg->field = field;
 369         msg->id = id;
 370         msg->notify.value[0] = value1;
 371         msg->notify.value[1] = value2;
 372         msg->flags = flags;
 373
 374         send_spoolss_notify2_msg(ev, msg_ctx, msg);
 375 }
 376
 377 static void send_notify_field_buffer(struct tevent_context *ev,
 378                                      struct messaging_context *msg_ctx,
 379                                      const char *sharename, uint32 type,
 380                                      uint32 field, uint32 id, uint32 len,
 381                                      const char *buffer)
 382 {
 383         struct spoolss_notify_msg *msg;
 384
 385         if (lp_disable_spoolss())
 386                 return;
 387
 388         if (!create_send_ctx())
 389                 return;
 390
 391         msg = talloc(send_ctx, struct spoolss_notify_msg);
 392         if (!msg)
 393                 return;
 394
 395         ZERO_STRUCTP(msg);
 396
 397         fstrcpy(msg->printer, sharename);
 398         msg->type = type;
 399         msg->field = field;
 400         msg->id = id;
 401         msg->len = len;
 402         msg->notify.data = discard_const_p(char, buffer);
 403
 404         send_spoolss_notify2_msg(ev, msg_ctx, msg);
 405 }
 406
 407 /* Send a message that the printer status has changed */
 408
 409 void notify_printer_status_byname(struct tevent_context *ev,
 410                                   struct messaging_context *msg_ctx,
 411                                   const char *sharename, uint32 status)
 412 {
 413         /* Printer status stored in value1 */
 414
 415         int snum = print_queue_snum(sharename);
 416
 417         send_notify_field_values(ev, msg_ctx, sharename, PRINTER_NOTIFY_TYPE,
 418                                  PRINTER_NOTIFY_FIELD_STATUS, snum,
 419                                  status, 0, 0);
 420 }
 421
 422 void notify_printer_status(struct tevent_context *ev,
 423                            struct messaging_context *msg_ctx,
 424                            int snum, uint32 status)
 425 {
 426         const char *sharename = lp_servicename(snum);
 427
 428         if (sharename)
 429                 notify_printer_status_byname(ev, msg_ctx, sharename, status);
 430 }
 431
 432 void notify_job_status_byname(struct tevent_context *ev,
 433                               struct messaging_context *msg_ctx,
 434                               const char *sharename, uint32 jobid,
 435                               uint32 status,
 436                               uint32 flags)
 437 {
 438         /* Job id stored in id field, status in value1 */
 439
 440         send_notify_field_values(ev, msg_ctx,
 441                                  sharename, JOB_NOTIFY_TYPE,
 442                                  JOB_NOTIFY_FIELD_STATUS, jobid,
 443                                  status, 0, flags);
 444 }
 445
 446 void notify_job_status(struct tevent_context *ev,
 447                        struct messaging_context *msg_ctx,
 448                        const char *sharename, uint32 jobid, uint32 status)
 449 {
 450         notify_job_status_byname(ev, msg_ctx, sharename, jobid, status, 0);
 451 }
 452
 453 void notify_job_total_bytes(struct tevent_context *ev,
 454                             struct messaging_context *msg_ctx,
 455                             const char *sharename, uint32 jobid,
 456                             uint32 size)
 457 {
 458         /* Job id stored in id field, status in value1 */
 459
 460         send_notify_field_values(ev, msg_ctx,
 461                                  sharename, JOB_NOTIFY_TYPE,
 462                                  JOB_NOTIFY_FIELD_TOTAL_BYTES, jobid,
 463                                  size, 0, 0);
 464 }
 465
 466 void notify_job_total_pages(struct tevent_context *ev,
 467                             struct messaging_context *msg_ctx,
 468                             const char *sharename, uint32 jobid,
 469                             uint32 pages)
 470 {
 471         /* Job id stored in id field, status in value1 */
 472
 473         send_notify_field_values(ev, msg_ctx,
 474                                  sharename, JOB_NOTIFY_TYPE,
 475                                  JOB_NOTIFY_FIELD_TOTAL_PAGES, jobid,
 476                                  pages, 0, 0);
 477 }
 478
 479 void notify_job_username(struct tevent_context *ev,
 480                          struct messaging_context *msg_ctx,
 481                          const char *sharename, uint32 jobid, char *name)
 482 {
 483         send_notify_field_buffer(
 484                 ev, msg_ctx,
 485                 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_FIELD_USER_NAME,
 486                 jobid, strlen(name) + 1, name);
 487 }
 488
 489 void notify_job_name(struct tevent_context *ev,
 490                      struct messaging_context *msg_ctx,
 491                      const char *sharename, uint32 jobid, char *name)
 492 {
 493         send_notify_field_buffer(
 494                 ev, msg_ctx,
 495                 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_FIELD_DOCUMENT,
 496                 jobid, strlen(name) + 1, name);
 497 }
 498
 499 void notify_job_submitted(struct tevent_context *ev,
 500                           struct messaging_context *msg_ctx,
 501                           const char *sharename, uint32 jobid,
 502                           time_t submitted)
 503 {
 504         send_notify_field_buffer(
 505                 ev, msg_ctx,
 506                 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_FIELD_SUBMITTED,
 507                 jobid, sizeof(submitted), (char *)&submitted);
 508 }
 509
 510 void notify_printer_driver(struct tevent_context *ev,
 511                            struct messaging_context *msg_ctx,
 512                            int snum, const char *driver_name)
 513 {
 514         const char *sharename = lp_servicename(snum);
 515
 516         send_notify_field_buffer(
 517                 ev, msg_ctx,
 518                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_DRIVER_NAME,
 519                 snum, strlen(driver_name) + 1, driver_name);
 520 }
 521
 522 void notify_printer_comment(struct tevent_context *ev,
 523                             struct messaging_context *msg_ctx,
 524                             int snum, const char *comment)
 525 {
 526         const char *sharename = lp_servicename(snum);
 527
 528         send_notify_field_buffer(
 529                 ev, msg_ctx,
 530                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_COMMENT,
 531                 snum, strlen(comment) + 1, comment);
 532 }
 533
 534 void notify_printer_sharename(struct tevent_context *ev,
 535                               struct messaging_context *msg_ctx,
 536                               int snum, const char *share_name)
 537 {
 538         const char *sharename = lp_servicename(snum);
 539
 540         send_notify_field_buffer(
 541                 ev, msg_ctx,
 542                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_SHARE_NAME,
 543                 snum, strlen(share_name) + 1, share_name);
 544 }
 545
 546 void notify_printer_printername(struct tevent_context *ev,
 547                                 struct messaging_context *msg_ctx,
 548                                 int snum, const char *printername)
 549 {
 550         const char *sharename = lp_servicename(snum);
 551
 552         send_notify_field_buffer(
 553                 ev, msg_ctx,
 554                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_PRINTER_NAME,
 555                 snum, strlen(printername) + 1, printername);
 556 }
 557
 558 void notify_printer_port(struct tevent_context *ev,
 559                          struct messaging_context *msg_ctx,
 560                          int snum, const char *port_name)
 561 {
 562         const char *sharename = lp_servicename(snum);
 563
 564         send_notify_field_buffer(
 565                 ev, msg_ctx,
 566                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_PORT_NAME,
 567                 snum, strlen(port_name) + 1, port_name);
 568 }
 569
 570 void notify_printer_location(struct tevent_context *ev,
 571                              struct messaging_context *msg_ctx,
 572                              int snum, const char *location)
 573 {
 574         const char *sharename = lp_servicename(snum);
 575
 576         send_notify_field_buffer(
 577                 ev, msg_ctx,
 578                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_LOCATION,
 579                 snum, strlen(location) + 1, location);
 580 }
 581
 582 void notify_printer_sepfile(struct tevent_context *ev,
 583                             struct messaging_context *msg_ctx,
 584                             int snum, const char *sepfile)
 585 {
 586         const char *sharename = lp_servicename(snum);
 587
 588         send_notify_field_buffer(
 589                 ev, msg_ctx,
 590                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_SEPFILE,
 591                 snum, strlen(sepfile) + 1, sepfile);
 592 }
 593
 594
 595 void notify_printer_byname(struct tevent_context *ev,
 596                            struct messaging_context *msg_ctx,
 597                            const char *printername, uint32 change,
 598                            const char *value)
 599 {
 600         int snum = print_queue_snum(printername);
 601         int type = PRINTER_NOTIFY_TYPE;
 602
 603         if ( snum == -1 )
 604                 return;
 605
 606         send_notify_field_buffer(
 607                 ev, msg_ctx,
 608                 printername, type, change, snum, strlen(value)+1, value );
 609 }
 610
 611
 612 /****************************************************************************
 613  Return a malloced list of pid_t's that are interested in getting update
 614  messages on this print queue. Used in printing/notify to send the messages.
 615 ****************************************************************************/
 616
 617 static bool print_notify_pid_list(const char *printername, TALLOC_CTX *mem_ctx,
 618                                   size_t *p_num_pids, pid_t **pp_pid_list)
 619 {
 620         struct tdb_print_db *pdb = NULL;
 621         TDB_CONTEXT *tdb = NULL;
 622         TDB_DATA data;
 623         bool ret = True;
 624         size_t i, num_pids, offset;
 625         pid_t *pid_list;
 626
 627         *p_num_pids = 0;
 628         *pp_pid_list = NULL;
 629
 630         pdb = get_print_db_byname(printername);
 631         if (!pdb)
 632                 return False;
 633         tdb = pdb->tdb;
 634
 635         if (tdb_read_lock_bystring_with_timeout(tdb, NOTIFY_PID_LIST_KEY, 10) != 0) {
 636                 DEBUG(0,("print_notify_pid_list: Failed to lock printer %s database\n",
 637                                         printername));
 638                 if (pdb)
 639                         release_print_db(pdb);
 640                 return False;
 641         }
 642
 643         data = get_printer_notify_pid_list( tdb, printername, True );
 644
 645         if (!data.dptr) {
 646                 ret = True;
 647                 goto done;
 648         }
 649
 650         num_pids = data.dsize / 8;
 651
 652         if (num_pids) {
 653                 if ((pid_list = talloc_array(mem_ctx, pid_t, num_pids)) == NULL) {
 654                         ret = False;
 655                         goto done;
 656                 }
 657         } else {
 658                 pid_list = NULL;
 659         }
 660
 661         for( i = 0, offset = 0; i < num_pids; offset += 8, i++)
 662                 pid_list[i] = (pid_t)IVAL(data.dptr, offset);
 663
 664         *pp_pid_list = pid_list;
 665         *p_num_pids = num_pids;
 666
 667         ret = True;
 668
 669   done:
 670
 671         tdb_read_unlock_bystring(tdb, NOTIFY_PID_LIST_KEY);
 672         if (pdb)
 673                 release_print_db(pdb);
 674         SAFE_FREE(data.dptr);
 675         return ret;
 676 }