source/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
  25 static TALLOC_CTX *send_ctx;
  26
  27 static unsigned int num_messages;
  28
  29 static struct notify_queue {
  30         struct notify_queue *next, *prev;
  31         struct spoolss_notify_msg *msg;
  32         struct timeval tv;
  33         uint8 *buf;
  34         size_t buflen;
  35 } *notify_queue_head = NULL;
  36
  37
  38 static bool create_send_ctx(void)
  39 {
  40         if (!send_ctx)
  41                 send_ctx = talloc_init("print notify queue");
  42
  43         if (!send_ctx)
  44                 return False;
  45
  46         return True;
  47 }
  48
  49 /****************************************************************************
  50  Turn a queue name into a snum.
  51 ****************************************************************************/
  52
  53 int print_queue_snum(const char *qname)
  54 {
  55         int snum = lp_servicenumber(qname);
  56         if (snum == -1 || !lp_print_ok(snum))
  57                 return -1;
  58         return snum;
  59 }
  60
  61 /*******************************************************************
  62  Used to decide if we need a short select timeout.
  63 *******************************************************************/
  64
  65 bool print_notify_messages_pending(void)
  66 {
  67         return (notify_queue_head != NULL);
  68 }
  69
  70 /*******************************************************************
  71  Flatten data into a message.
  72 *******************************************************************/
  73
  74 static bool flatten_message(struct notify_queue *q)
  75 {
  76         struct spoolss_notify_msg *msg = q->msg;
  77         uint8 *buf = NULL;
  78         size_t buflen = 0, len;
  79
  80 again:
  81         len = 0;
  82
  83         /* Pack header */
  84
  85         len += tdb_pack(buf + len, buflen - len, "f", msg->printer);
  86
  87         len += tdb_pack(buf + len, buflen - len, "ddddddd",
  88                         (uint32)q->tv.tv_sec, (uint32)q->tv.tv_usec,
  89                         msg->type, msg->field, msg->id, msg->len, msg->flags);
  90
  91         /* Pack data */
  92
  93         if (msg->len == 0)
  94                 len += tdb_pack(buf + len, buflen - len, "dd",
  95                                 msg->notify.value[0], msg->notify.value[1]);
  96         else
  97                 len += tdb_pack(buf + len, buflen - len, "B",
  98                                 msg->len, msg->notify.data);
  99
 100         if (buflen != len) {
 101                 buf = (uint8 *)TALLOC_REALLOC(send_ctx, buf, len);
 102                 if (!buf)
 103                         return False;
 104                 buflen = len;
 105                 goto again;
 106         }
 107
 108         q->buf = buf;
 109         q->buflen = buflen;
 110
 111         return True;
 112 }
 113
 114 /*******************************************************************
 115  Send the batched messages - on a per-printer basis.
 116 *******************************************************************/
 117
 118 static void print_notify_send_messages_to_printer(struct messaging_context *msg_ctx,
 119                                                   const char *printer,
 120                                                   unsigned int timeout)
 121 {
 122         char *buf;
 123         struct notify_queue *pq, *pq_next;
 124         size_t msg_count = 0, offset = 0;
 125         size_t num_pids = 0;
 126         size_t i;
 127         pid_t *pid_list = NULL;
 128         struct timeval end_time = timeval_zero();
 129
 130         /* Count the space needed to send the messages. */
 131         for (pq = notify_queue_head; pq; pq = pq->next) {
 132                 if (strequal(printer, pq->msg->printer)) {
 133                         if (!flatten_message(pq)) {
 134                                 DEBUG(0,("print_notify_send_messages: Out of memory\n"));
 135                                 talloc_free_children(send_ctx);
 136                                 num_messages = 0;
 137                                 return;
 138                         }
 139                         offset += (pq->buflen + 4);
 140                         msg_count++;
 141                 }
 142         }
 143         offset += 4; /* For count. */
 144
 145         buf = (char *)TALLOC(send_ctx, offset);
 146         if (!buf) {
 147                 DEBUG(0,("print_notify_send_messages: Out of memory\n"));
 148                 talloc_free_children(send_ctx);
 149                 num_messages = 0;
 150                 return;
 151         }
 152
 153         offset = 0;
 154         SIVAL(buf,offset,msg_count);
 155         offset += 4;
 156         for (pq = notify_queue_head; pq; pq = pq_next) {
 157                 pq_next = pq->next;
 158
 159                 if (strequal(printer, pq->msg->printer)) {
 160                         SIVAL(buf,offset,pq->buflen);
 161                         offset += 4;
 162                         memcpy(buf + offset, pq->buf, pq->buflen);
 163                         offset += pq->buflen;
 164
 165                         /* Remove from list. */
 166                         DLIST_REMOVE(notify_queue_head, pq);
 167                 }
 168         }
 169
 170         DEBUG(5, ("print_notify_send_messages_to_printer: sending %lu print notify message%s to printer %s\n",
 171                   (unsigned long)msg_count, msg_count != 1 ? "s" : "", printer));
 172
 173         /*
 174          * Get the list of PID's to send to.
 175          */
 176
 177         if (!print_notify_pid_list(printer, send_ctx, &num_pids, &pid_list))
 178                 return;
 179
 180         if (timeout != 0) {
 181                 end_time = timeval_current_ofs(timeout, 0);
 182         }
 183
 184         for (i = 0; i < num_pids; i++) {
 185                 messaging_send_buf(msg_ctx,
 186                                    pid_to_procid(pid_list[i]),
 187                                    MSG_PRINTER_NOTIFY2 | MSG_FLAG_LOWPRIORITY,
 188                                    (uint8 *)buf, offset);
 189
 190                 if ((timeout != 0) && timeval_expired(&end_time)) {
 191                         break;
 192                 }
 193         }
 194 }
 195
 196 /*******************************************************************
 197  Actually send the batched messages.
 198 *******************************************************************/
 199
 200 void print_notify_send_messages(struct messaging_context *msg_ctx,
 201                                 unsigned int timeout)
 202 {
 203         if (!print_notify_messages_pending())
 204                 return;
 205
 206         if (!create_send_ctx())
 207                 return;
 208
 209         while (print_notify_messages_pending())
 210                 print_notify_send_messages_to_printer(
 211                         msg_ctx, notify_queue_head->msg->printer, timeout);
 212
 213         talloc_free_children(send_ctx);
 214         num_messages = 0;
 215 }
 216
 217 /**********************************************************************
 218  deep copy a SPOOLSS_NOTIFY_MSG structure using a TALLOC_CTX
 219  *********************************************************************/
 220
 221 static bool copy_notify2_msg( SPOOLSS_NOTIFY_MSG *to, SPOOLSS_NOTIFY_MSG *from )
 222 {
 223
 224         if ( !to || !from )
 225                 return False;
 226
 227         memcpy( to, from, sizeof(SPOOLSS_NOTIFY_MSG) );
 228
 229         if ( from->len ) {
 230                 to->notify.data = (char *)TALLOC_MEMDUP(send_ctx, from->notify.data, from->len );
 231                 if ( !to->notify.data ) {
 232                         DEBUG(0,("copy_notify2_msg: TALLOC_MEMDUP() of size [%d] failed!\n", from->len ));
 233                         return False;
 234                 }
 235         }
 236
 237
 238         return True;
 239 }
 240
 241 /*******************************************************************
 242  Batch up print notify messages.
 243 *******************************************************************/
 244
 245 static void send_spoolss_notify2_msg(SPOOLSS_NOTIFY_MSG *msg)
 246 {
 247         struct notify_queue *pnqueue, *tmp_ptr;
 248
 249         /*
 250          * Ensure we only have one job total_bytes and job total_pages for
 251          * each job. There is no point in sending multiple messages that match
 252          * as they will just cause flickering updates in the client.
 253          */
 254
 255         if ((num_messages < 100) && (msg->type == JOB_NOTIFY_TYPE)
 256                 && (msg->field == JOB_NOTIFY_TOTAL_BYTES
 257                     || msg->field == JOB_NOTIFY_TOTAL_PAGES ))
 258         {
 259
 260                 for (tmp_ptr = notify_queue_head; tmp_ptr; tmp_ptr = tmp_ptr->next)
 261                 {
 262                         if (tmp_ptr->msg->type == msg->type &&
 263                                         tmp_ptr->msg->field == msg->field &&
 264                                         tmp_ptr->msg->id == msg->id &&
 265                                         tmp_ptr->msg->flags == msg->flags &&
 266                                         strequal(tmp_ptr->msg->printer, msg->printer)) {
 267
 268                                 DEBUG(5,("send_spoolss_notify2_msg: replacing message 0x%02x/0x%02x for "
 269                                          "printer %s in notify_queue\n", msg->type, msg->field, msg->printer));
 270
 271                                 tmp_ptr->msg = msg;
 272                                 return;
 273                         }
 274                 }
 275         }
 276
 277         /* Store the message on the pending queue. */
 278
 279         pnqueue = TALLOC_P(send_ctx, struct notify_queue);
 280         if (!pnqueue) {
 281                 DEBUG(0,("send_spoolss_notify2_msg: Out of memory.\n"));
 282                 return;
 283         }
 284
 285         /* allocate a new msg structure and copy the fields */
 286
 287         if ( !(pnqueue->msg = TALLOC_P(send_ctx, SPOOLSS_NOTIFY_MSG)) ) {
 288                 DEBUG(0,("send_spoolss_notify2_msg: talloc() of size [%lu] failed!\n",
 289                         (unsigned long)sizeof(SPOOLSS_NOTIFY_MSG)));
 290                 return;
 291         }
 292         copy_notify2_msg(pnqueue->msg, msg);
 293         GetTimeOfDay(&pnqueue->tv);
 294         pnqueue->buf = NULL;
 295         pnqueue->buflen = 0;
 296
 297         DEBUG(5, ("send_spoolss_notify2_msg: appending message 0x%02x/0x%02x for printer %s \
 298 to notify_queue_head\n", msg->type, msg->field, msg->printer));
 299
 300         /*
 301          * Note we add to the end of the list to ensure
 302          * the messages are sent in the order they were received. JRA.
 303          */
 304
 305         DLIST_ADD_END(notify_queue_head, pnqueue, struct notify_queue *);
 306         num_messages++;
 307 }
 308
 309 static void send_notify_field_values(const char *sharename, uint32 type,
 310                                      uint32 field, uint32 id, uint32 value1,
 311                                      uint32 value2, uint32 flags)
 312 {
 313         struct spoolss_notify_msg *msg;
 314
 315         if (lp_disable_spoolss())
 316                 return;
 317
 318         if (!create_send_ctx())
 319                 return;
 320
 321         msg = TALLOC_P(send_ctx, struct spoolss_notify_msg);
 322         if (!msg)
 323                 return;
 324
 325         ZERO_STRUCTP(msg);
 326
 327         fstrcpy(msg->printer, sharename);
 328         msg->type = type;
 329         msg->field = field;
 330         msg->id = id;
 331         msg->notify.value[0] = value1;
 332         msg->notify.value[1] = value2;
 333         msg->flags = flags;
 334
 335         send_spoolss_notify2_msg(msg);
 336 }
 337
 338 static void send_notify_field_buffer(const char *sharename, uint32 type,
 339                                      uint32 field, uint32 id, uint32 len,
 340                                      const char *buffer)
 341 {
 342         struct spoolss_notify_msg *msg;
 343
 344         if (lp_disable_spoolss())
 345                 return;
 346
 347         if (!create_send_ctx())
 348                 return;
 349
 350         msg = TALLOC_P(send_ctx, struct spoolss_notify_msg);
 351         if (!msg)
 352                 return;
 353
 354         ZERO_STRUCTP(msg);
 355
 356         fstrcpy(msg->printer, sharename);
 357         msg->type = type;
 358         msg->field = field;
 359         msg->id = id;
 360         msg->len = len;
 361         msg->notify.data = CONST_DISCARD(char *,buffer);
 362
 363         send_spoolss_notify2_msg(msg);
 364 }
 365
 366 /* Send a message that the printer status has changed */
 367
 368 void notify_printer_status_byname(const char *sharename, uint32 status)
 369 {
 370         /* Printer status stored in value1 */
 371
 372         send_notify_field_values(sharename, PRINTER_NOTIFY_TYPE,
 373                                  PRINTER_NOTIFY_STATUS, 0,
 374                                  status, 0, 0);
 375 }
 376
 377 void notify_printer_status(int snum, uint32 status)
 378 {
 379         const char *sharename = SERVICE(snum);
 380
 381         if (sharename)
 382                 notify_printer_status_byname(sharename, status);
 383 }
 384
 385 void notify_job_status_byname(const char *sharename, uint32 jobid, uint32 status,
 386                               uint32 flags)
 387 {
 388         /* Job id stored in id field, status in value1 */
 389
 390         send_notify_field_values(sharename, JOB_NOTIFY_TYPE,
 391                                  JOB_NOTIFY_STATUS, jobid,
 392                                  status, 0, flags);
 393 }
 394
 395 void notify_job_status(const char *sharename, uint32 jobid, uint32 status)
 396 {
 397         notify_job_status_byname(sharename, jobid, status, 0);
 398 }
 399
 400 void notify_job_total_bytes(const char *sharename, uint32 jobid,
 401                             uint32 size)
 402 {
 403         /* Job id stored in id field, status in value1 */
 404
 405         send_notify_field_values(sharename, JOB_NOTIFY_TYPE,
 406                                  JOB_NOTIFY_TOTAL_BYTES, jobid,
 407                                  size, 0, 0);
 408 }
 409
 410 void notify_job_total_pages(const char *sharename, uint32 jobid,
 411                             uint32 pages)
 412 {
 413         /* Job id stored in id field, status in value1 */
 414
 415         send_notify_field_values(sharename, JOB_NOTIFY_TYPE,
 416                                  JOB_NOTIFY_TOTAL_PAGES, jobid,
 417                                  pages, 0, 0);
 418 }
 419
 420 void notify_job_username(const char *sharename, uint32 jobid, char *name)
 421 {
 422         send_notify_field_buffer(
 423                 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_USER_NAME,
 424                 jobid, strlen(name) + 1, name);
 425 }
 426
 427 void notify_job_name(const char *sharename, uint32 jobid, char *name)
 428 {
 429         send_notify_field_buffer(
 430                 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_DOCUMENT,
 431                 jobid, strlen(name) + 1, name);
 432 }
 433
 434 void notify_job_submitted(const char *sharename, uint32 jobid,
 435                           time_t submitted)
 436 {
 437         send_notify_field_buffer(
 438                 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_SUBMITTED,
 439                 jobid, sizeof(submitted), (char *)&submitted);
 440 }
 441
 442 void notify_printer_driver(int snum, char *driver_name)
 443 {
 444         const char *sharename = SERVICE(snum);
 445
 446         send_notify_field_buffer(
 447                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_DRIVER_NAME,
 448                 snum, strlen(driver_name) + 1, driver_name);
 449 }
 450
 451 void notify_printer_comment(int snum, char *comment)
 452 {
 453         const char *sharename = SERVICE(snum);
 454
 455         send_notify_field_buffer(
 456                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_COMMENT,
 457                 snum, strlen(comment) + 1, comment);
 458 }
 459
 460 void notify_printer_sharename(int snum, char *share_name)
 461 {
 462         const char *sharename = SERVICE(snum);
 463
 464         send_notify_field_buffer(
 465                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_SHARE_NAME,
 466                 snum, strlen(share_name) + 1, share_name);
 467 }
 468
 469 void notify_printer_printername(int snum, char *printername)
 470 {
 471         const char *sharename = SERVICE(snum);
 472
 473         send_notify_field_buffer(
 474                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_PRINTER_NAME,
 475                 snum, strlen(printername) + 1, printername);
 476 }
 477
 478 void notify_printer_port(int snum, char *port_name)
 479 {
 480         const char *sharename = SERVICE(snum);
 481
 482         send_notify_field_buffer(
 483                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_PORT_NAME,
 484                 snum, strlen(port_name) + 1, port_name);
 485 }
 486
 487 void notify_printer_location(int snum, char *location)
 488 {
 489         const char *sharename = SERVICE(snum);
 490
 491         send_notify_field_buffer(
 492                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_LOCATION,
 493                 snum, strlen(location) + 1, location);
 494 }
 495
 496 void notify_printer_byname( const char *printername, uint32 change, const char *value )
 497 {
 498         int snum = print_queue_snum(printername);
 499         int type = PRINTER_NOTIFY_TYPE;
 500
 501         if ( snum == -1 )
 502                 return;
 503
 504         send_notify_field_buffer( printername, type, change, snum, strlen(value)+1, value );
 505 }
 506
 507
 508 /****************************************************************************
 509  Return a malloced list of pid_t's that are interested in getting update
 510  messages on this print queue. Used in printing/notify to send the messages.
 511 ****************************************************************************/
 512
 513 bool print_notify_pid_list(const char *printername, TALLOC_CTX *mem_ctx, size_t *p_num_pids, pid_t **pp_pid_list)
 514 {
 515         struct tdb_print_db *pdb = NULL;
 516         TDB_CONTEXT *tdb = NULL;
 517         TDB_DATA data;
 518         bool ret = True;
 519         size_t i, num_pids, offset;
 520         pid_t *pid_list;
 521
 522         *p_num_pids = 0;
 523         *pp_pid_list = NULL;
 524
 525         pdb = get_print_db_byname(printername);
 526         if (!pdb)
 527                 return False;
 528         tdb = pdb->tdb;
 529
 530         if (tdb_read_lock_bystring_with_timeout(tdb, NOTIFY_PID_LIST_KEY, 10) == -1) {
 531                 DEBUG(0,("print_notify_pid_list: Failed to lock printer %s database\n",
 532                                         printername));
 533                 if (pdb)
 534                         release_print_db(pdb);
 535                 return False;
 536         }
 537
 538         data = get_printer_notify_pid_list( tdb, printername, True );
 539
 540         if (!data.dptr) {
 541                 ret = True;
 542                 goto done;
 543         }
 544
 545         num_pids = data.dsize / 8;
 546
 547         if (num_pids) {
 548                 if ((pid_list = TALLOC_ARRAY(mem_ctx, pid_t, num_pids)) == NULL) {
 549                         ret = False;
 550                         goto done;
 551                 }
 552         } else {
 553                 pid_list = NULL;
 554         }
 555
 556         for( i = 0, offset = 0; i < num_pids; offset += 8, i++)
 557                 pid_list[i] = (pid_t)IVAL(data.dptr, offset);
 558
 559         *pp_pid_list = pid_list;
 560         *p_num_pids = num_pids;
 561
 562         ret = True;
 563
 564   done:
 565
 566         tdb_read_unlock_bystring(tdb, NOTIFY_PID_LIST_KEY);
 567         if (pdb)
 568                 release_print_db(pdb);
 569         SAFE_FREE(data.dptr);
 570         return ret;
 571 }