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