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 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_destroy_pool(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_destroy_pool(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_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_list[i], MSG_PRINTER_NOTIFY2, buf, offset, True, timeout);
 186         }
 187 }
 188
 189 /*******************************************************************
 190  Actually send the batched messages.
 191 *******************************************************************/
 192
 193 void print_notify_send_messages(unsigned int timeout)
 194 {
 195         if (!print_notify_messages_pending())
 196                 return;
 197
 198         if (!create_send_ctx())
 199                 return;
 200
 201         while (print_notify_messages_pending())
 202                 print_notify_send_messages_to_printer(notify_queue_head->msg->printer, timeout);
 203
 204         talloc_destroy_pool(send_ctx);
 205         num_messages = 0;
 206 }
 207
 208 /**********************************************************************
 209  deep copy a SPOOLSS_NOTIFY_MSG structure using a TALLOC_CTX
 210  *********************************************************************/
 211
 212 static BOOL copy_notify2_msg( SPOOLSS_NOTIFY_MSG *to, SPOOLSS_NOTIFY_MSG *from )
 213 {
 214
 215         if ( !to || !from )
 216                 return False;
 217
 218         memcpy( to, from, sizeof(SPOOLSS_NOTIFY_MSG) );
 219
 220         if ( from->len ) {
 221                 to->notify.data = talloc_memdup(send_ctx, from->notify.data, from->len );
 222                 if ( !to->notify.data ) {
 223                         DEBUG(0,("copy_notify2_msg: talloc_memdup() of size [%d] failed!\n", from->len ));
 224                         return False;
 225                 }
 226         }
 227
 228
 229         return True;
 230 }
 231
 232 /*******************************************************************
 233  Batch up print notify messages.
 234 *******************************************************************/
 235
 236 static void send_spoolss_notify2_msg(SPOOLSS_NOTIFY_MSG *msg)
 237 {
 238         struct notify_queue *pnqueue, *tmp_ptr;
 239
 240         /*
 241          * Ensure we only have one job total_bytes and job total_pages for
 242          * each job. There is no point in sending multiple messages that match
 243          * as they will just cause flickering updates in the client.
 244          */
 245
 246         if ((num_messages < 100) && (msg->type == JOB_NOTIFY_TYPE) &&
 247                                 (msg->field == JOB_NOTIFY_TOTAL_BYTES || msg->field == JOB_NOTIFY_TOTAL_PAGES)) {
 248
 249                 for (tmp_ptr = notify_queue_head; tmp_ptr; tmp_ptr = tmp_ptr->next) {
 250                         if (tmp_ptr->msg->type == msg->type &&
 251                                         tmp_ptr->msg->field == msg->field &&
 252                                         tmp_ptr->msg->id == msg->id &&
 253                                         tmp_ptr->msg->flags == msg->flags &&
 254                                         strequal(tmp_ptr->msg->printer, msg->printer)) {
 255
 256                                 DEBUG(5, ("send_spoolss_notify2_msg: replacing message 0x%02x/0x%02x for printer %s \
 257 in notify_queue\n", msg->type, msg->field, msg->printer));
 258
 259                                 tmp_ptr->msg = msg;
 260                                 return;
 261                         }
 262                 }
 263         }
 264
 265         /* Store the message on the pending queue. */
 266
 267         pnqueue = talloc(send_ctx, sizeof(*pnqueue));
 268         if (!pnqueue) {
 269                 DEBUG(0,("send_spoolss_notify2_msg: Out of memory.\n"));
 270                 return;
 271         }
 272
 273         /* allocate a new msg structure and copy the fields */
 274
 275         if ( !(pnqueue->msg = (SPOOLSS_NOTIFY_MSG*)talloc(send_ctx, sizeof(SPOOLSS_NOTIFY_MSG))) ) {
 276                 DEBUG(0,("send_spoolss_notify2_msg: talloc() of size [%lu] failed!\n",
 277                         (unsigned long)sizeof(SPOOLSS_NOTIFY_MSG)));
 278                 return;
 279         }
 280         copy_notify2_msg(pnqueue->msg, msg);
 281         gettimeofday(&pnqueue->tv, NULL);
 282         pnqueue->buf = NULL;
 283         pnqueue->buflen = 0;
 284
 285         DEBUG(5, ("send_spoolss_notify2_msg: appending message 0x%02x/0x%02x for printer %s \
 286 to notify_queue_head\n", msg->type, msg->field, msg->printer));
 287
 288         /*
 289          * Note we add to the end of the list to ensure
 290          * the messages are sent in the order they were received. JRA.
 291          */
 292
 293         DLIST_ADD_END(notify_queue_head, pnqueue, tmp_ptr);
 294         num_messages++;
 295 }
 296
 297 static void send_notify_field_values(const char *printer_name, uint32 type,
 298                                      uint32 field, uint32 id, uint32 value1,
 299                                      uint32 value2, uint32 flags)
 300 {
 301         struct spoolss_notify_msg *msg;
 302
 303         if (lp_disable_spoolss())
 304                 return;
 305
 306         if (!create_send_ctx())
 307                 return;
 308
 309         msg = (struct spoolss_notify_msg *)talloc(send_ctx, sizeof(struct spoolss_notify_msg));
 310         if (!msg)
 311                 return;
 312
 313         ZERO_STRUCTP(msg);
 314
 315         fstrcpy(msg->printer, printer_name);
 316         msg->type = type;
 317         msg->field = field;
 318         msg->id = id;
 319         msg->notify.value[0] = value1;
 320         msg->notify.value[1] = value2;
 321         msg->flags = flags;
 322
 323         send_spoolss_notify2_msg(msg);
 324 }
 325
 326 static void send_notify_field_buffer(const char *printer_name, uint32 type,
 327                                      uint32 field, uint32 id, uint32 len,
 328                                      char *buffer)
 329 {
 330         struct spoolss_notify_msg *msg;
 331
 332         if (lp_disable_spoolss())
 333                 return;
 334
 335         if (!create_send_ctx())
 336                 return;
 337
 338         msg = (struct spoolss_notify_msg *)talloc(send_ctx, sizeof(struct spoolss_notify_msg));
 339         if (!msg)
 340                 return;
 341
 342         ZERO_STRUCTP(msg);
 343
 344         fstrcpy(msg->printer, printer_name);
 345         msg->type = type;
 346         msg->field = field;
 347         msg->id = id;
 348         msg->len = len;
 349         msg->notify.data = buffer;
 350
 351         send_spoolss_notify2_msg(msg);
 352 }
 353
 354 /* Send a message that the printer status has changed */
 355
 356 void notify_printer_status_byname(const char *printer_name, uint32 status)
 357 {
 358         /* Printer status stored in value1 */
 359
 360         send_notify_field_values(printer_name, PRINTER_NOTIFY_TYPE,
 361                                  PRINTER_NOTIFY_STATUS, 0,
 362                                  status, 0, 0);
 363 }
 364
 365 void notify_printer_status(int snum, uint32 status)
 366 {
 367         const char *printer_name = SERVICE(snum);
 368
 369         if (printer_name)
 370                 notify_printer_status_byname(printer_name, status);
 371 }
 372
 373 void notify_job_status_byname(const char *printer_name, uint32 jobid, uint32 status,
 374                               uint32 flags)
 375 {
 376         /* Job id stored in id field, status in value1 */
 377
 378         send_notify_field_values(printer_name, JOB_NOTIFY_TYPE,
 379                                  JOB_NOTIFY_STATUS, jobid,
 380                                  status, 0, flags);
 381 }
 382
 383 void notify_job_status(int snum, uint32 jobid, uint32 status)
 384 {
 385         const char *printer_name = SERVICE(snum);
 386
 387         notify_job_status_byname(printer_name, jobid, status, 0);
 388 }
 389
 390 void notify_job_total_bytes(int snum, uint32 jobid, uint32 size)
 391 {
 392         const char *printer_name = SERVICE(snum);
 393
 394         /* Job id stored in id field, status in value1 */
 395
 396         send_notify_field_values(printer_name, JOB_NOTIFY_TYPE,
 397                                  JOB_NOTIFY_TOTAL_BYTES, jobid,
 398                                  size, 0, 0);
 399 }
 400
 401 void notify_job_total_pages(int snum, uint32 jobid, uint32 pages)
 402 {
 403         const char *printer_name = SERVICE(snum);
 404
 405         /* Job id stored in id field, status in value1 */
 406
 407         send_notify_field_values(printer_name, JOB_NOTIFY_TYPE,
 408                                  JOB_NOTIFY_TOTAL_PAGES, jobid,
 409                                  pages, 0, 0);
 410 }
 411
 412 void notify_job_username(int snum, uint32 jobid, char *name)
 413 {
 414         const char *printer_name = SERVICE(snum);
 415
 416         send_notify_field_buffer(
 417                 printer_name, JOB_NOTIFY_TYPE, JOB_NOTIFY_USER_NAME,
 418                 jobid, strlen(name) + 1, name);
 419 }
 420
 421 void notify_job_name(int snum, uint32 jobid, char *name)
 422 {
 423         const char *printer_name = SERVICE(snum);
 424
 425         send_notify_field_buffer(
 426                 printer_name, JOB_NOTIFY_TYPE, JOB_NOTIFY_DOCUMENT,
 427                 jobid, strlen(name) + 1, name);
 428 }
 429
 430 void notify_job_submitted(int snum, uint32 jobid, time_t submitted)
 431 {
 432         const char *printer_name = SERVICE(snum);
 433
 434         send_notify_field_buffer(
 435                 printer_name, JOB_NOTIFY_TYPE, JOB_NOTIFY_SUBMITTED,
 436                 jobid, sizeof(submitted), (char *)&submitted);
 437 }
 438
 439 void notify_printer_driver(int snum, char *driver_name)
 440 {
 441         const char *printer_name = SERVICE(snum);
 442
 443         send_notify_field_buffer(
 444                 printer_name, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_DRIVER_NAME,
 445                 snum, strlen(driver_name) + 1, driver_name);
 446 }
 447
 448 void notify_printer_comment(int snum, char *comment)
 449 {
 450         const char *printer_name = SERVICE(snum);
 451
 452         send_notify_field_buffer(
 453                 printer_name, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_COMMENT,
 454                 snum, strlen(comment) + 1, comment);
 455 }
 456
 457 void notify_printer_sharename(int snum, char *share_name)
 458 {
 459         const char *printer_name = SERVICE(snum);
 460
 461         send_notify_field_buffer(
 462                 printer_name, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_SHARE_NAME,
 463                 snum, strlen(share_name) + 1, share_name);
 464 }
 465
 466 void notify_printer_port(int snum, char *port_name)
 467 {
 468         const char *printer_name = SERVICE(snum);
 469
 470         send_notify_field_buffer(
 471                 printer_name, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_PORT_NAME,
 472                 snum, strlen(port_name) + 1, port_name);
 473 }
 474
 475 void notify_printer_location(int snum, char *location)
 476 {
 477         const char *printer_name = SERVICE(snum);
 478
 479         send_notify_field_buffer(
 480                 printer_name, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_LOCATION,
 481                 snum, strlen(location) + 1, location);
 482 }
 483
 484 void notify_printer_byname( const char *printername, uint32 change, char *value )
 485 {
 486         int snum = print_queue_snum(printername);
 487         int type = PRINTER_NOTIFY_TYPE;
 488
 489         if ( snum == -1 )
 490                 return;
 491
 492         send_notify_field_buffer( printername, type, change, snum, strlen(value)+1, value );
 493 }
 494
 495
 496 /****************************************************************************
 497  Return a malloced list of pid_t's that are interested in getting update
 498  messages on this print queue. Used in printing/notify to send the messages.
 499 ****************************************************************************/
 500
 501 BOOL print_notify_pid_list(const char *printername, TALLOC_CTX *mem_ctx, size_t *p_num_pids, pid_t **pp_pid_list)
 502 {
 503         struct tdb_print_db *pdb = NULL;
 504         TDB_CONTEXT *tdb = NULL;
 505         TDB_DATA data;
 506         BOOL ret = True;
 507         size_t i, num_pids, offset;
 508         pid_t *pid_list;
 509
 510         *p_num_pids = 0;
 511         *pp_pid_list = NULL;
 512
 513         pdb = get_print_db_byname(printername);
 514         if (!pdb)
 515                 return False;
 516         tdb = pdb->tdb;
 517
 518         if (tdb_read_lock_bystring(tdb, NOTIFY_PID_LIST_KEY, 10) == -1) {
 519                 DEBUG(0,("print_notify_pid_list: Failed to lock printer %s database\n",
 520                                         printername));
 521                 if (pdb)
 522                         release_print_db(pdb);
 523                 return False;
 524         }
 525
 526         data = get_printer_notify_pid_list( tdb, printername, True );
 527
 528         if (!data.dptr) {
 529                 ret = True;
 530                 goto done;
 531         }
 532
 533         num_pids = data.dsize / 8;
 534
 535         if ((pid_list = (pid_t *)talloc(mem_ctx, sizeof(pid_t) * num_pids)) == NULL) {
 536                 ret = False;
 537                 goto done;
 538         }
 539
 540         for( i = 0, offset = 0; offset < data.dsize; offset += 8, i++)
 541                 pid_list[i] = (pid_t)IVAL(data.dptr, offset);
 542
 543         *pp_pid_list = pid_list;
 544         *p_num_pids = num_pids;
 545
 546         ret = True;
 547
 548   done:
 549
 550         tdb_read_unlock_bystring(tdb, NOTIFY_PID_LIST_KEY);
 551         if (pdb)
 552                 release_print_db(pdb);
 553         SAFE_FREE(data.dptr);
 554         return ret;
 555 }