source3/printing/notify.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 2.2
   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 %d print notify message%s to printer %s\n",
 168                   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                 message_send_pid_with_timeout(pid_list[i], MSG_PRINTER_NOTIFY2, buf, offset, True, timeout);
 179 }
 180
 181 /*******************************************************************
 182  Actually send the batched messages.
 183 *******************************************************************/
 184
 185 void print_notify_send_messages(unsigned int timeout)
 186 {
 187         if (!print_notify_messages_pending())
 188                 return;
 189
 190         if (!create_send_ctx())
 191                 return;
 192
 193         while (print_notify_messages_pending())
 194                 print_notify_send_messages_to_printer(notify_queue_head->msg->printer, timeout);
 195
 196         talloc_destroy_pool(send_ctx);
 197         num_messages = 0;
 198 }
 199
 200 /**********************************************************************
 201  deep copy a SPOOLSS_NOTIFY_MSG structure using a TALLOC_CTX
 202  *********************************************************************/
 203
 204 static BOOL copy_notify2_msg( SPOOLSS_NOTIFY_MSG *to, SPOOLSS_NOTIFY_MSG *from )
 205 {
 206
 207         if ( !to || !from )
 208                 return False;
 209
 210         memcpy( to, from, sizeof(SPOOLSS_NOTIFY_MSG) );
 211
 212         if ( from->len ) {
 213                 to->notify.data = talloc_memdup(send_ctx, from->notify.data, from->len );
 214                 if ( !to->notify.data ) {
 215                         DEBUG(0,("copy_notify2_msg: talloc_memdup() of size [%d] failed!\n", from->len ));
 216                         return False;
 217                 }
 218         }
 219
 220
 221         return True;
 222 }
 223
 224 /*******************************************************************
 225  Batch up print notify messages.
 226 *******************************************************************/
 227
 228 static void send_spoolss_notify2_msg(SPOOLSS_NOTIFY_MSG *msg)
 229 {
 230         struct notify_queue *pnqueue, *tmp_ptr;
 231
 232         /*
 233          * Ensure we only have one job total_bytes and job total_pages for
 234          * each job. There is no point in sending multiple messages that match
 235          * as they will just cause flickering updates in the client.
 236          */
 237
 238         if ((num_messages < 100) && (msg->type == JOB_NOTIFY_TYPE) &&
 239                                 (msg->field == JOB_NOTIFY_TOTAL_BYTES || msg->field == JOB_NOTIFY_TOTAL_PAGES)) {
 240
 241                 for (tmp_ptr = notify_queue_head; tmp_ptr; tmp_ptr = tmp_ptr->next) {
 242                         if (tmp_ptr->msg->type == msg->type &&
 243                                         tmp_ptr->msg->field == msg->field &&
 244                                         tmp_ptr->msg->id == msg->id &&
 245                                         tmp_ptr->msg->flags == msg->flags &&
 246                                         strequal(tmp_ptr->msg->printer, msg->printer)) {
 247
 248                                 DEBUG(5, ("send_spoolss_notify2_msg: replacing message 0x%02x/0x%02x for printer %s \
 249 in notify_queue\n", msg->type, msg->field, msg->printer));
 250
 251                                 tmp_ptr->msg = msg;
 252                                 return;
 253                         }
 254                 }
 255         }
 256
 257         /* Store the message on the pending queue. */
 258
 259         pnqueue = talloc(send_ctx, sizeof(*pnqueue));
 260         if (!pnqueue) {
 261                 DEBUG(0,("send_spoolss_notify2_msg: Out of memory.\n"));
 262                 return;
 263         }
 264
 265         /* allocate a new msg structure and copy the fields */
 266
 267         if ( !(pnqueue->msg = (SPOOLSS_NOTIFY_MSG*)talloc(send_ctx, sizeof(SPOOLSS_NOTIFY_MSG))) ) {
 268                 DEBUG(0,("send_spoolss_notify2_msg: talloc() of size [%d] failed!\n",
 269                         sizeof(SPOOLSS_NOTIFY_MSG)));
 270                 return;
 271         }
 272         copy_notify2_msg(pnqueue->msg, msg);
 273         gettimeofday(&pnqueue->tv, NULL);
 274         pnqueue->buf = NULL;
 275         pnqueue->buflen = 0;
 276
 277         DEBUG(5, ("send_spoolss_notify2_msg: appending message 0x%02x/0x%02x for printer %s \
 278 to notify_queue_head\n", msg->type, msg->field, msg->printer));
 279
 280         /*
 281          * Note we add to the end of the list to ensure
 282          * the messages are sent in the order they were received. JRA.
 283          */
 284
 285         DLIST_ADD_END(notify_queue_head, pnqueue, tmp_ptr);
 286         num_messages++;
 287 }
 288
 289 static void send_notify_field_values(const char *printer_name, uint32 type,
 290                                      uint32 field, uint32 id, uint32 value1,
 291                                      uint32 value2, uint32 flags)
 292 {
 293         struct spoolss_notify_msg *msg;
 294
 295         if (lp_disable_spoolss())
 296                 return;
 297
 298         if (!create_send_ctx())
 299                 return;
 300
 301         msg = (struct spoolss_notify_msg *)talloc(send_ctx, sizeof(struct spoolss_notify_msg));
 302         if (!msg)
 303                 return;
 304
 305         ZERO_STRUCTP(msg);
 306
 307         fstrcpy(msg->printer, printer_name);
 308         msg->type = type;
 309         msg->field = field;
 310         msg->id = id;
 311         msg->notify.value[0] = value1;
 312         msg->notify.value[1] = value2;
 313         msg->flags = flags;
 314
 315         send_spoolss_notify2_msg(msg);
 316 }
 317
 318 static void send_notify_field_buffer(const char *printer_name, uint32 type,
 319                                      uint32 field, uint32 id, uint32 len,
 320                                      char *buffer)
 321 {
 322         struct spoolss_notify_msg *msg;
 323
 324         if (lp_disable_spoolss())
 325                 return;
 326
 327         if (!create_send_ctx())
 328                 return;
 329
 330         msg = (struct spoolss_notify_msg *)talloc(send_ctx, sizeof(struct spoolss_notify_msg));
 331         if (!msg)
 332                 return;
 333
 334         ZERO_STRUCTP(msg);
 335
 336         fstrcpy(msg->printer, printer_name);
 337         msg->type = type;
 338         msg->field = field;
 339         msg->id = id;
 340         msg->len = len;
 341         msg->notify.data = buffer;
 342
 343         send_spoolss_notify2_msg(msg);
 344 }
 345
 346 /* Send a message that the printer status has changed */
 347
 348 void notify_printer_status_byname(const char *printer_name, uint32 status)
 349 {
 350         /* Printer status stored in value1 */
 351
 352         send_notify_field_values(printer_name, PRINTER_NOTIFY_TYPE,
 353                                  PRINTER_NOTIFY_STATUS, 0,
 354                                  status, 0, 0);
 355 }
 356
 357 void notify_printer_status(int snum, uint32 status)
 358 {
 359         const char *printer_name = SERVICE(snum);
 360
 361         if (printer_name)
 362                 notify_printer_status_byname(printer_name, status);
 363 }
 364
 365 void notify_job_status_byname(const char *printer_name, uint32 jobid, uint32 status,
 366                               uint32 flags)
 367 {
 368         /* Job id stored in id field, status in value1 */
 369
 370         send_notify_field_values(printer_name, JOB_NOTIFY_TYPE,
 371                                  JOB_NOTIFY_STATUS, jobid,
 372                                  status, 0, flags);
 373 }
 374
 375 void notify_job_status(int snum, uint32 jobid, uint32 status)
 376 {
 377         const char *printer_name = SERVICE(snum);
 378
 379         notify_job_status_byname(printer_name, jobid, status, 0);
 380 }
 381
 382 void notify_job_total_bytes(int snum, uint32 jobid, uint32 size)
 383 {
 384         const char *printer_name = SERVICE(snum);
 385
 386         /* Job id stored in id field, status in value1 */
 387
 388         send_notify_field_values(printer_name, JOB_NOTIFY_TYPE,
 389                                  JOB_NOTIFY_TOTAL_BYTES, jobid,
 390                                  size, 0, 0);
 391 }
 392
 393 void notify_job_total_pages(int snum, uint32 jobid, uint32 pages)
 394 {
 395         const char *printer_name = SERVICE(snum);
 396
 397         /* Job id stored in id field, status in value1 */
 398
 399         send_notify_field_values(printer_name, JOB_NOTIFY_TYPE,
 400                                  JOB_NOTIFY_TOTAL_PAGES, jobid,
 401                                  pages, 0, 0);
 402 }
 403
 404 void notify_job_username(int snum, uint32 jobid, char *name)
 405 {
 406         const char *printer_name = SERVICE(snum);
 407
 408         send_notify_field_buffer(
 409                 printer_name, JOB_NOTIFY_TYPE, JOB_NOTIFY_USER_NAME,
 410                 jobid, strlen(name) + 1, name);
 411 }
 412
 413 void notify_job_name(int snum, uint32 jobid, char *name)
 414 {
 415         const char *printer_name = SERVICE(snum);
 416
 417         send_notify_field_buffer(
 418                 printer_name, JOB_NOTIFY_TYPE, JOB_NOTIFY_DOCUMENT,
 419                 jobid, strlen(name) + 1, name);
 420 }
 421
 422 void notify_job_submitted(int snum, uint32 jobid, time_t submitted)
 423 {
 424         const char *printer_name = SERVICE(snum);
 425
 426         send_notify_field_buffer(
 427                 printer_name, JOB_NOTIFY_TYPE, JOB_NOTIFY_SUBMITTED,
 428                 jobid, sizeof(submitted), (char *)&submitted);
 429 }
 430
 431 void notify_printer_driver(int snum, char *driver_name)
 432 {
 433         const char *printer_name = SERVICE(snum);
 434
 435         send_notify_field_buffer(
 436                 printer_name, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_DRIVER_NAME,
 437                 snum, strlen(driver_name) + 1, driver_name);
 438 }
 439
 440 void notify_printer_comment(int snum, char *comment)
 441 {
 442         const char *printer_name = SERVICE(snum);
 443
 444         send_notify_field_buffer(
 445                 printer_name, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_COMMENT,
 446                 snum, strlen(comment) + 1, comment);
 447 }
 448
 449 void notify_printer_sharename(int snum, char *share_name)
 450 {
 451         const char *printer_name = SERVICE(snum);
 452
 453         send_notify_field_buffer(
 454                 printer_name, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_SHARE_NAME,
 455                 snum, strlen(share_name) + 1, share_name);
 456 }
 457
 458 void notify_printer_port(int snum, char *port_name)
 459 {
 460         const char *printer_name = SERVICE(snum);
 461
 462         send_notify_field_buffer(
 463                 printer_name, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_PORT_NAME,
 464                 snum, strlen(port_name) + 1, port_name);
 465 }
 466
 467 void notify_printer_location(int snum, char *location)
 468 {
 469         const char *printer_name = SERVICE(snum);
 470
 471         send_notify_field_buffer(
 472                 printer_name, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_LOCATION,
 473                 snum, strlen(location) + 1, location);
 474 }
 475
 476 void notify_printer_byname( char *printername, uint32 change, char *value )
 477 {
 478         int snum = print_queue_snum(printername);
 479         int type = PRINTER_NOTIFY_TYPE;
 480
 481         if ( snum == -1 )
 482                 return;
 483
 484         send_notify_field_buffer( printername, type, change, snum, strlen(value)+1, value );
 485 }
 486
 487
 488 /****************************************************************************
 489  Return a malloced list of pid_t's that are interested in getting update
 490  messages on this print queue. Used in printing/notify to send the messages.
 491 ****************************************************************************/
 492
 493 BOOL print_notify_pid_list(const char *printername, TALLOC_CTX *mem_ctx, size_t *p_num_pids, pid_t **pp_pid_list)
 494 {
 495         struct tdb_print_db *pdb = NULL;
 496         TDB_CONTEXT *tdb = NULL;
 497         TDB_DATA data;
 498         BOOL ret = True;
 499         size_t i, num_pids, offset;
 500         pid_t *pid_list;
 501
 502         *p_num_pids = 0;
 503         *pp_pid_list = NULL;
 504
 505         pdb = get_print_db_byname(printername);
 506         if (!pdb)
 507                 return False;
 508         tdb = pdb->tdb;
 509
 510         if (tdb_read_lock_bystring(tdb, NOTIFY_PID_LIST_KEY, 10) == -1) {
 511                 DEBUG(0,("print_notify_pid_list: Failed to lock printer %s database\n",
 512                                         printername));
 513                 if (pdb)
 514                         release_print_db(pdb);
 515                 return False;
 516         }
 517
 518         data = get_printer_notify_pid_list( tdb, printername, True );
 519
 520         if (!data.dptr) {
 521                 ret = True;
 522                 goto done;
 523         }
 524
 525         num_pids = data.dsize / 8;
 526
 527         if ((pid_list = (pid_t *)talloc(mem_ctx, sizeof(pid_t) * num_pids)) == NULL) {
 528                 ret = False;
 529                 goto done;
 530         }
 531
 532         for( i = 0, offset = 0; offset < data.dsize; offset += 8, i++)
 533                 pid_list[i] = (pid_t)IVAL(data.dptr, offset);
 534
 535         *pp_pid_list = pid_list;
 536         *p_num_pids = num_pids;
 537
 538         ret = True;
 539
 540   done:
 541
 542         tdb_read_unlock_bystring(tdb, NOTIFY_PID_LIST_KEY);
 543         if (pdb)
 544                 release_print_db(pdb);
 545         SAFE_FREE(data.dptr);
 546         return ret;
 547 }