git.maemo.org Git - samba/blob - 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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "printing.h"
  25
  26 static TALLOC_CTX *send_ctx;
  27
  28 static unsigned int num_messages;
  29
  30 static struct notify_queue {
  31         struct notify_queue *next, *prev;
  32         struct spoolss_notify_msg *msg;
  33         struct timeval tv;
  34         char *buf;
  35         size_t buflen;
  36 } *notify_queue_head = NULL;
  37
  38
  39 static BOOL create_send_ctx(void)
  40 {
  41         if (!send_ctx)
  42                 send_ctx = talloc_init("print notify queue");
  43
  44         if (!send_ctx)
  45                 return False;
  46
  47         return True;
  48 }
  49
  50 /****************************************************************************
  51  Turn a queue name into a snum.
  52 ****************************************************************************/
  53
  54 int print_queue_snum(const char *qname)
  55 {
  56         int snum = lp_servicenumber(qname);
  57         if (snum == -1 || !lp_print_ok(snum))
  58                 return -1;
  59         return snum;
  60 }
  61
  62 /*******************************************************************
  63  Used to decide if we need a short select timeout.
  64 *******************************************************************/
  65
  66 BOOL print_notify_messages_pending(void)
  67 {
  68         return (notify_queue_head != NULL);
  69 }
  70
  71 /*******************************************************************
  72  Flatten data into a message.
  73 *******************************************************************/
  74
  75 static BOOL flatten_message(struct notify_queue *q)
  76 {
  77         struct spoolss_notify_msg *msg = q->msg;
  78         char *buf = NULL;
  79         size_t buflen = 0, len;
  80
  81 again:
  82         len = 0;
  83
  84         /* Pack header */
  85
  86         len += tdb_pack(buf + len, buflen - len, "f", msg->printer);
  87
  88         len += tdb_pack(buf + len, buflen - len, "ddddddd",
  89                         (uint32)q->tv.tv_sec, (uint32)q->tv.tv_usec,
  90                         msg->type, msg->field, msg->id, msg->len, msg->flags);
  91
  92         /* Pack data */
  93
  94         if (msg->len == 0)
  95                 len += tdb_pack(buf + len, buflen - len, "dd",
  96                                 msg->notify.value[0], msg->notify.value[1]);
  97         else
  98                 len += tdb_pack(buf + len, buflen - len, "B",
  99                                 msg->len, msg->notify.data);
 100
 101         if (buflen != len) {
 102                 buf = TALLOC_REALLOC(send_ctx, buf, len);
 103                 if (!buf)
 104                         return False;
 105                 buflen = len;
 106                 goto again;
 107         }
 108
 109         q->buf = buf;
 110         q->buflen = buflen;
 111
 112         return True;
 113 }
 114
 115 /*******************************************************************
 116  Send the batched messages - on a per-printer basis.
 117 *******************************************************************/
 118
 119 static void print_notify_send_messages_to_printer(const char *printer, unsigned int timeout)
 120 {
 121         char *buf;
 122         struct notify_queue *pq, *pq_next;
 123         size_t msg_count = 0, offset = 0;
 124         size_t num_pids = 0;
 125         size_t i;
 126         pid_t *pid_list = NULL;
 127
 128         /* Count the space needed to send the messages. */
 129         for (pq = notify_queue_head; pq; pq = pq->next) {
 130                 if (strequal(printer, pq->msg->printer)) {
 131                         if (!flatten_message(pq)) {
 132                                 DEBUG(0,("print_notify_send_messages: Out of memory\n"));
 133                                 talloc_free_children(send_ctx);
 134                                 num_messages = 0;
 135                                 return;
 136                         }
 137                         offset += (pq->buflen + 4);
 138                         msg_count++;
 139                 }
 140         }
 141         offset += 4; /* For count. */
 142
 143         buf = TALLOC(send_ctx, offset);
 144         if (!buf) {
 145                 DEBUG(0,("print_notify_send_messages: Out of memory\n"));
 146                 talloc_free_children(send_ctx);
 147                 num_messages = 0;
 148                 return;
 149         }
 150
 151         offset = 0;
 152         SIVAL(buf,offset,msg_count);
 153         offset += 4;
 154         for (pq = notify_queue_head; pq; pq = pq_next) {
 155                 pq_next = pq->next;
 156
 157                 if (strequal(printer, pq->msg->printer)) {
 158                         SIVAL(buf,offset,pq->buflen);
 159                         offset += 4;
 160                         memcpy(buf + offset, pq->buf, pq->buflen);
 161                         offset += pq->buflen;
 162
 163                         /* Remove from list. */
 164                         DLIST_REMOVE(notify_queue_head, pq);
 165                 }
 166         }
 167
 168         DEBUG(5, ("print_notify_send_messages_to_printer: sending %lu print notify message%s to printer %s\n",
 169                   (unsigned long)msg_count, msg_count != 1 ? "s" : "", printer));
 170
 171         /*
 172          * Get the list of PID's to send to.
 173          */
 174
 175         if (!print_notify_pid_list(printer, send_ctx, &num_pids, &pid_list))
 176                 return;
 177
 178         for (i = 0; i < num_pids; i++) {
 179                 unsigned int q_len = messages_pending_for_pid(pid_to_procid(pid_list[i]));
 180                 if (q_len > 1000) {
 181                         DEBUG(5, ("print_notify_send_messages_to_printer: discarding notify to printer %s as queue length = %u\n",
 182                                 printer, q_len ));
 183                         continue;
 184                 }
 185                 message_send_pid_with_timeout(pid_to_procid(pid_list[i]),
 186                                               MSG_PRINTER_NOTIFY2,
 187                                               buf, offset, True, timeout);
 188         }
 189 }
 190
 191 /*******************************************************************
 192  Actually send the batched messages.
 193 *******************************************************************/
 194
 195 void print_notify_send_messages(unsigned int timeout)
 196 {
 197         if (!print_notify_messages_pending())
 198                 return;
 199
 200         if (!create_send_ctx())
 201                 return;
 202
 203         while (print_notify_messages_pending())
 204                 print_notify_send_messages_to_printer(notify_queue_head->msg->printer, timeout);
 205
 206         talloc_free_children(send_ctx);
 207         num_messages = 0;
 208 }
 209
 210 /**********************************************************************
 211  deep copy a SPOOLSS_NOTIFY_MSG structure using a TALLOC_CTX
 212  *********************************************************************/
 213
 214 static BOOL copy_notify2_msg( SPOOLSS_NOTIFY_MSG *to, SPOOLSS_NOTIFY_MSG *from )
 215 {
 216
 217         if ( !to || !from )
 218                 return False;
 219
 220         memcpy( to, from, sizeof(SPOOLSS_NOTIFY_MSG) );
 221
 222         if ( from->len ) {
 223                 to->notify.data = TALLOC_MEMDUP(send_ctx, from->notify.data, from->len );
 224                 if ( !to->notify.data ) {
 225                         DEBUG(0,("copy_notify2_msg: talloc_memdup() of size [%d] failed!\n", from->len ));
 226                         return False;
 227                 }
 228         }
 229
 230
 231         return True;
 232 }
 233
 234 /*******************************************************************
 235  Batch up print notify messages.
 236 *******************************************************************/
 237
 238 static void send_spoolss_notify2_msg(SPOOLSS_NOTIFY_MSG *msg)
 239 {
 240         struct notify_queue *pnqueue, *tmp_ptr;
 241
 242         /*
 243          * Ensure we only have one job total_bytes and job total_pages for
 244          * each job. There is no point in sending multiple messages that match
 245          * as they will just cause flickering updates in the client.
 246          */
 247
 248         if ((num_messages < 100) && (msg->type == JOB_NOTIFY_TYPE)
 249                 && (msg->field == JOB_NOTIFY_TOTAL_BYTES
 250                     || msg->field == JOB_NOTIFY_TOTAL_PAGES ))
 251         {
 252
 253                 for (tmp_ptr = notify_queue_head; tmp_ptr; tmp_ptr = tmp_ptr->next)
 254                 {
 255                         if (tmp_ptr->msg->type == msg->type &&
 256                                         tmp_ptr->msg->field == msg->field &&
 257                                         tmp_ptr->msg->id == msg->id &&
 258                                         tmp_ptr->msg->flags == msg->flags &&
 259                                         strequal(tmp_ptr->msg->printer, msg->printer)) {
 260
 261                                 DEBUG(5,("send_spoolss_notify2_msg: replacing message 0x%02x/0x%02x for "
 262                                          "printer %s in notify_queue\n", msg->type, msg->field, msg->printer));
 263
 264                                 tmp_ptr->msg = msg;
 265                                 return;
 266                         }
 267                 }
 268         }
 269
 270         /* Store the message on the pending queue. */
 271
 272         pnqueue = TALLOC_P(send_ctx, struct notify_queue);
 273         if (!pnqueue) {
 274                 DEBUG(0,("send_spoolss_notify2_msg: Out of memory.\n"));
 275                 return;
 276         }
 277
 278         /* allocate a new msg structure and copy the fields */
 279
 280         if ( !(pnqueue->msg = TALLOC_P(send_ctx, SPOOLSS_NOTIFY_MSG)) ) {
 281                 DEBUG(0,("send_spoolss_notify2_msg: talloc() of size [%lu] failed!\n",
 282                         (unsigned long)sizeof(SPOOLSS_NOTIFY_MSG)));
 283                 return;
 284         }
 285         copy_notify2_msg(pnqueue->msg, msg);
 286         GetTimeOfDay(&pnqueue->tv);
 287         pnqueue->buf = NULL;
 288         pnqueue->buflen = 0;
 289
 290         DEBUG(5, ("send_spoolss_notify2_msg: appending message 0x%02x/0x%02x for printer %s \
 291 to notify_queue_head\n", msg->type, msg->field, msg->printer));
 292
 293         /*
 294          * Note we add to the end of the list to ensure
 295          * the messages are sent in the order they were received. JRA.
 296          */
 297
 298         DLIST_ADD_END(notify_queue_head, pnqueue, tmp_ptr);
 299         num_messages++;
 300 }
 301
 302 static void send_notify_field_values(const char *sharename, uint32 type,
 303                                      uint32 field, uint32 id, uint32 value1,
 304                                      uint32 value2, uint32 flags)
 305 {
 306         struct spoolss_notify_msg *msg;
 307
 308         if (lp_disable_spoolss())
 309                 return;
 310
 311         if (!create_send_ctx())
 312                 return;
 313
 314         msg = TALLOC_P(send_ctx, struct spoolss_notify_msg);
 315         if (!msg)
 316                 return;
 317
 318         ZERO_STRUCTP(msg);
 319
 320         fstrcpy(msg->printer, sharename);
 321         msg->type = type;
 322         msg->field = field;
 323         msg->id = id;
 324         msg->notify.value[0] = value1;
 325         msg->notify.value[1] = value2;
 326         msg->flags = flags;
 327
 328         send_spoolss_notify2_msg(msg);
 329 }
 330
 331 static void send_notify_field_buffer(const char *sharename, uint32 type,
 332                                      uint32 field, uint32 id, uint32 len,
 333                                      const char *buffer)
 334 {
 335         struct spoolss_notify_msg *msg;
 336
 337         if (lp_disable_spoolss())
 338                 return;
 339
 340         if (!create_send_ctx())
 341                 return;
 342
 343         msg = TALLOC_P(send_ctx, struct spoolss_notify_msg);
 344         if (!msg)
 345                 return;
 346
 347         ZERO_STRUCTP(msg);
 348
 349         fstrcpy(msg->printer, sharename);
 350         msg->type = type;
 351         msg->field = field;
 352         msg->id = id;
 353         msg->len = len;
 354         msg->notify.data = CONST_DISCARD(char *,buffer);
 355
 356         send_spoolss_notify2_msg(msg);
 357 }
 358
 359 /* Send a message that the printer status has changed */
 360
 361 void notify_printer_status_byname(const char *sharename, uint32 status)
 362 {
 363         /* Printer status stored in value1 */
 364
 365         send_notify_field_values(sharename, PRINTER_NOTIFY_TYPE,
 366                                  PRINTER_NOTIFY_STATUS, 0,
 367                                  status, 0, 0);
 368 }
 369
 370 void notify_printer_status(int snum, uint32 status)
 371 {
 372         const char *sharename = SERVICE(snum);
 373
 374         if (sharename)
 375                 notify_printer_status_byname(sharename, status);
 376 }
 377
 378 void notify_job_status_byname(const char *sharename, uint32 jobid, uint32 status,
 379                               uint32 flags)
 380 {
 381         /* Job id stored in id field, status in value1 */
 382
 383         send_notify_field_values(sharename, JOB_NOTIFY_TYPE,
 384                                  JOB_NOTIFY_STATUS, jobid,
 385                                  status, 0, flags);
 386 }
 387
 388 void notify_job_status(const char *sharename, uint32 jobid, uint32 status)
 389 {
 390         notify_job_status_byname(sharename, jobid, status, 0);
 391 }
 392
 393 void notify_job_total_bytes(const char *sharename, uint32 jobid,
 394                             uint32 size)
 395 {
 396         /* Job id stored in id field, status in value1 */
 397
 398         send_notify_field_values(sharename, JOB_NOTIFY_TYPE,
 399                                  JOB_NOTIFY_TOTAL_BYTES, jobid,
 400                                  size, 0, 0);
 401 }
 402
 403 void notify_job_total_pages(const char *sharename, uint32 jobid,
 404                             uint32 pages)
 405 {
 406         /* Job id stored in id field, status in value1 */
 407
 408         send_notify_field_values(sharename, JOB_NOTIFY_TYPE,
 409                                  JOB_NOTIFY_TOTAL_PAGES, jobid,
 410                                  pages, 0, 0);
 411 }
 412
 413 void notify_job_username(const char *sharename, uint32 jobid, char *name)
 414 {
 415         send_notify_field_buffer(
 416                 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_USER_NAME,
 417                 jobid, strlen(name) + 1, name);
 418 }
 419
 420 void notify_job_name(const char *sharename, uint32 jobid, char *name)
 421 {
 422         send_notify_field_buffer(
 423                 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_DOCUMENT,
 424                 jobid, strlen(name) + 1, name);
 425 }
 426
 427 void notify_job_submitted(const char *sharename, uint32 jobid,
 428                           time_t submitted)
 429 {
 430         send_notify_field_buffer(
 431                 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_SUBMITTED,
 432                 jobid, sizeof(submitted), (char *)&submitted);
 433 }
 434
 435 void notify_printer_driver(int snum, char *driver_name)
 436 {
 437         const char *sharename = SERVICE(snum);
 438
 439         send_notify_field_buffer(
 440                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_DRIVER_NAME,
 441                 snum, strlen(driver_name) + 1, driver_name);
 442 }
 443
 444 void notify_printer_comment(int snum, char *comment)
 445 {
 446         const char *sharename = SERVICE(snum);
 447
 448         send_notify_field_buffer(
 449                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_COMMENT,
 450                 snum, strlen(comment) + 1, comment);
 451 }
 452
 453 void notify_printer_sharename(int snum, char *share_name)
 454 {
 455         const char *sharename = SERVICE(snum);
 456
 457         send_notify_field_buffer(
 458                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_SHARE_NAME,
 459                 snum, strlen(share_name) + 1, share_name);
 460 }
 461
 462 void notify_printer_printername(int snum, char *printername)
 463 {
 464         const char *sharename = SERVICE(snum);
 465
 466         send_notify_field_buffer(
 467                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_PRINTER_NAME,
 468                 snum, strlen(printername) + 1, printername);
 469 }
 470
 471 void notify_printer_port(int snum, char *port_name)
 472 {
 473         const char *sharename = SERVICE(snum);
 474
 475         send_notify_field_buffer(
 476                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_PORT_NAME,
 477                 snum, strlen(port_name) + 1, port_name);
 478 }
 479
 480 void notify_printer_location(int snum, char *location)
 481 {
 482         const char *sharename = SERVICE(snum);
 483
 484         send_notify_field_buffer(
 485                 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_LOCATION,
 486                 snum, strlen(location) + 1, location);
 487 }
 488
 489 void notify_printer_byname( const char *printername, uint32 change, const char *value )
 490 {
 491         int snum = print_queue_snum(printername);
 492         int type = PRINTER_NOTIFY_TYPE;
 493
 494         if ( snum == -1 )
 495                 return;
 496
 497         send_notify_field_buffer( printername, type, change, snum, strlen(value)+1, value );
 498 }
 499
 500
 501 /****************************************************************************
 502  Return a malloced list of pid_t's that are interested in getting update
 503  messages on this print queue. Used in printing/notify to send the messages.
 504 ****************************************************************************/
 505
 506 BOOL print_notify_pid_list(const char *printername, TALLOC_CTX *mem_ctx, size_t *p_num_pids, pid_t **pp_pid_list)
 507 {
 508         struct tdb_print_db *pdb = NULL;
 509         TDB_CONTEXT *tdb = NULL;
 510         TDB_DATA data;
 511         BOOL ret = True;
 512         size_t i, num_pids, offset;
 513         pid_t *pid_list;
 514
 515         *p_num_pids = 0;
 516         *pp_pid_list = NULL;
 517
 518         pdb = get_print_db_byname(printername);
 519         if (!pdb)
 520                 return False;
 521         tdb = pdb->tdb;
 522
 523         if (tdb_read_lock_bystring(tdb, NOTIFY_PID_LIST_KEY, 10) == -1) {
 524                 DEBUG(0,("print_notify_pid_list: Failed to lock printer %s database\n",
 525                                         printername));
 526                 if (pdb)
 527                         release_print_db(pdb);
 528                 return False;
 529         }
 530
 531         data = get_printer_notify_pid_list( tdb, printername, True );
 532
 533         if (!data.dptr) {
 534                 ret = True;
 535                 goto done;
 536         }
 537
 538         num_pids = data.dsize / 8;
 539
 540         if ((pid_list = TALLOC_ARRAY(mem_ctx, pid_t, num_pids)) == NULL) {
 541                 ret = False;
 542                 goto done;
 543         }
 544
 545         for( i = 0, offset = 0; offset < data.dsize; offset += 8, i++)
 546                 pid_list[i] = (pid_t)IVAL(data.dptr, offset);
 547
 548         *pp_pid_list = pid_list;
 549         *p_num_pids = num_pids;
 550
 551         ret = True;
 552
 553   done:
 554
 555         tdb_read_unlock_bystring(tdb, NOTIFY_PID_LIST_KEY);
 556         if (pdb)
 557                 release_print_db(pdb);
 558         SAFE_FREE(data.dptr);
 559         return ret;
 560 }