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