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