source3/printing/printer_list.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Share Database of available printers.
   4    Copyright (C) Simo Sorce 2010
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "system/filesys.h"
  22 #include "dbwrap/dbwrap.h"
  23 #include "dbwrap/dbwrap_open.h"
  24 #include "util_tdb.h"
  25 #include "printer_list.h"
  26
  27 #define PL_DB_NAME() lock_path("printer_list.tdb")
  28 #define PL_KEY_PREFIX "PRINTERLIST/PRN/"
  29 #define PL_KEY_FORMAT PL_KEY_PREFIX"%s"
  30 #define PL_TIMESTAMP_KEY "PRINTERLIST/GLOBAL/LAST_REFRESH"
  31 #define PL_DATA_FORMAT "ddPPP"
  32 #define PL_TSTAMP_FORMAT "dd"
  33
  34 static struct db_context *get_printer_list_db(void)
  35 {
  36         static struct db_context *db;
  37
  38         if (db != NULL) {
  39                 return db;
  40         }
  41         db = db_open(NULL, PL_DB_NAME(), 0,
  42                      TDB_DEFAULT|TDB_CLEAR_IF_FIRST|TDB_INCOMPATIBLE_HASH,
  43                      O_RDWR|O_CREAT, 0644);
  44         return db;
  45 }
  46
  47 bool printer_list_parent_init(void)
  48 {
  49         struct db_context *db;
  50
  51         /*
  52          * Open the tdb in the parent process (smbd) so that our
  53          * CLEAR_IF_FIRST optimization in tdb_reopen_all can properly
  54          * work.
  55          */
  56
  57         db = get_printer_list_db();
  58         if (db == NULL) {
  59                 DEBUG(1, ("could not open Printer List Database: %s\n",
  60                           strerror(errno)));
  61                 return false;
  62         }
  63         return true;
  64 }
  65
  66 NTSTATUS printer_list_get_printer(TALLOC_CTX *mem_ctx,
  67                                   const char *name,
  68                                   const char **comment,
  69                                   const char **location,
  70                                   time_t *last_refresh)
  71 {
  72         struct db_context *db;
  73         char *key;
  74         TDB_DATA data;
  75         uint32_t time_h, time_l;
  76         char *nstr = NULL;
  77         char *cstr = NULL;
  78         char *lstr = NULL;
  79         NTSTATUS status;
  80         int ret;
  81
  82         db = get_printer_list_db();
  83         if (db == NULL) {
  84                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  85         }
  86
  87         key = talloc_asprintf(mem_ctx, PL_KEY_FORMAT, name);
  88         if (!key) {
  89                 DEBUG(0, ("Failed to allocate key name!\n"));
  90                 return NT_STATUS_NO_MEMORY;
  91         }
  92
  93         data = dbwrap_fetch_bystring_upper(db, key, key);
  94         if (data.dptr == NULL) {
  95                 DEBUG(1, ("Failed to fetch record!\n"));
  96                 status = NT_STATUS_NOT_FOUND;
  97                 goto done;
  98         }
  99
 100         ret = tdb_unpack(data.dptr, data.dsize,
 101                          PL_DATA_FORMAT,
 102                          &time_h, &time_l, &nstr, &cstr, &lstr);
 103         if (ret == -1) {
 104                 DEBUG(1, ("Failed to un pack printer data"));
 105                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 106                 goto done;
 107         }
 108
 109         if (last_refresh) {
 110                 *last_refresh = (time_t)(((uint64_t)time_h << 32) + time_l);
 111         }
 112
 113         if (comment) {
 114                 *comment = talloc_strdup(mem_ctx, cstr);
 115                 if (!*comment) {
 116                         DEBUG(1, ("Failed to strdup comment!\n"));
 117                         status = NT_STATUS_NO_MEMORY;
 118                         goto done;
 119                 }
 120         }
 121
 122         if (location) {
 123                 *location = talloc_strdup(mem_ctx, lstr);
 124                 if (*location == NULL) {
 125                         DEBUG(1, ("Failed to strdup location!\n"));
 126                         status = NT_STATUS_NO_MEMORY;
 127                         goto done;
 128                 }
 129         }
 130
 131         status = NT_STATUS_OK;
 132
 133 done:
 134         SAFE_FREE(nstr);
 135         SAFE_FREE(cstr);
 136         TALLOC_FREE(key);
 137         return status;
 138 }
 139
 140 NTSTATUS printer_list_set_printer(TALLOC_CTX *mem_ctx,
 141                                   const char *name,
 142                                   const char *comment,
 143                                   const char *location,
 144                                   time_t last_refresh)
 145 {
 146         struct db_context *db;
 147         char *key;
 148         TDB_DATA data;
 149         uint64_t time_64;
 150         uint32_t time_h, time_l;
 151         const char *str = NULL;
 152         const char *str2 = NULL;
 153         NTSTATUS status;
 154         int len;
 155
 156         db = get_printer_list_db();
 157         if (db == NULL) {
 158                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 159         }
 160
 161         key = talloc_asprintf(mem_ctx, PL_KEY_FORMAT, name);
 162         if (!key) {
 163                 DEBUG(0, ("Failed to allocate key name!\n"));
 164                 return NT_STATUS_NO_MEMORY;
 165         }
 166
 167         if (comment) {
 168                 str = comment;
 169         } else {
 170                 str = "";
 171         }
 172
 173         if (location) {
 174                 str2 = location;
 175         } else {
 176                 str2 = "";
 177         }
 178
 179
 180         time_64 = last_refresh;
 181         time_l = time_64 & 0xFFFFFFFFL;
 182         time_h = time_64 >> 32;
 183
 184         len = tdb_pack(NULL, 0, PL_DATA_FORMAT, time_h, time_l, name, str, str2);
 185
 186         data.dptr = talloc_array(key, uint8_t, len);
 187         if (!data.dptr) {
 188                 DEBUG(0, ("Failed to allocate tdb data buffer!\n"));
 189                 status = NT_STATUS_NO_MEMORY;
 190                 goto done;
 191         }
 192         data.dsize = len;
 193
 194         len = tdb_pack(data.dptr, data.dsize,
 195                        PL_DATA_FORMAT, time_h, time_l, name, str);
 196
 197         status = dbwrap_store_bystring_upper(db, key, data, TDB_REPLACE);
 198
 199 done:
 200         TALLOC_FREE(key);
 201         return status;
 202 }
 203
 204 NTSTATUS printer_list_get_last_refresh(time_t *last_refresh)
 205 {
 206         struct db_context *db;
 207         TDB_DATA data;
 208         uint32_t time_h, time_l;
 209         NTSTATUS status;
 210         int ret;
 211
 212         db = get_printer_list_db();
 213         if (db == NULL) {
 214                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 215         }
 216
 217         ZERO_STRUCT(data);
 218
 219         data = dbwrap_fetch_bystring(db, talloc_tos(), PL_TIMESTAMP_KEY);
 220         if (data.dptr == NULL) {
 221                 DEBUG(1, ("Failed to fetch record!\n"));
 222                 status = NT_STATUS_NOT_FOUND;
 223                 goto done;
 224         }
 225
 226         ret = tdb_unpack(data.dptr, data.dsize,
 227                          PL_TSTAMP_FORMAT, &time_h, &time_l);
 228         if (ret == -1) {
 229                 DEBUG(1, ("Failed to un pack printer data"));
 230                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 231                 goto done;
 232         }
 233
 234         *last_refresh = (time_t)(((uint64_t)time_h << 32) + time_l);
 235         status = NT_STATUS_OK;
 236
 237 done:
 238         return status;
 239 }
 240
 241 NTSTATUS printer_list_mark_reload(void)
 242 {
 243         struct db_context *db;
 244         TDB_DATA data;
 245         uint32_t time_h, time_l;
 246         time_t now = time_mono(NULL);
 247         NTSTATUS status;
 248         int len;
 249
 250         db = get_printer_list_db();
 251         if (db == NULL) {
 252                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 253         }
 254
 255         time_l = ((uint64_t)now) & 0xFFFFFFFFL;
 256         time_h = ((uint64_t)now) >> 32;
 257
 258         len = tdb_pack(NULL, 0, PL_TSTAMP_FORMAT, time_h, time_l);
 259
 260         data.dptr = talloc_array(talloc_tos(), uint8_t, len);
 261         if (!data.dptr) {
 262                 DEBUG(0, ("Failed to allocate tdb data buffer!\n"));
 263                 status = NT_STATUS_NO_MEMORY;
 264                 goto done;
 265         }
 266         data.dsize = len;
 267
 268         len = tdb_pack(data.dptr, data.dsize,
 269                        PL_TSTAMP_FORMAT, time_h, time_l);
 270
 271         status = dbwrap_store_bystring(db, PL_TIMESTAMP_KEY,
 272                                                 data, TDB_REPLACE);
 273
 274 done:
 275         TALLOC_FREE(data.dptr);
 276         return status;
 277 }
 278
 279 typedef int (printer_list_trv_fn_t)(struct db_record *, void *);
 280
 281 static NTSTATUS printer_list_traverse(printer_list_trv_fn_t *fn,
 282                                                 void *private_data)
 283 {
 284         struct db_context *db;
 285         int ret;
 286
 287         db = get_printer_list_db();
 288         if (db == NULL) {
 289                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 290         }
 291
 292         ret = db->traverse(db, fn, private_data);
 293         if (ret < 0) {
 294                 return NT_STATUS_UNSUCCESSFUL;
 295         }
 296
 297         return NT_STATUS_OK;
 298 }
 299
 300 struct printer_list_clean_state {
 301         time_t last_refresh;
 302         NTSTATUS status;
 303 };
 304
 305 static int printer_list_clean_fn(struct db_record *rec, void *private_data)
 306 {
 307         struct printer_list_clean_state *state =
 308                         (struct printer_list_clean_state *)private_data;
 309         uint32_t time_h, time_l;
 310         time_t refresh;
 311         char *name;
 312         char *comment;
 313         char *location;
 314         int ret;
 315
 316         /* skip anything that does not contain PL_DATA_FORMAT data */
 317         if (strncmp((char *)rec->key.dptr,
 318                     PL_KEY_PREFIX, sizeof(PL_KEY_PREFIX)-1)) {
 319                 return 0;
 320         }
 321
 322         ret = tdb_unpack(rec->value.dptr, rec->value.dsize,
 323                          PL_DATA_FORMAT, &time_h, &time_l, &name, &comment,
 324                          &location);
 325         if (ret == -1) {
 326                 DEBUG(1, ("Failed to un pack printer data"));
 327                 state->status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 328                 return -1;
 329         }
 330
 331         SAFE_FREE(name);
 332         SAFE_FREE(comment);
 333         SAFE_FREE(location);
 334
 335         refresh = (time_t)(((uint64_t)time_h << 32) + time_l);
 336
 337         if (refresh < state->last_refresh) {
 338                 state->status = rec->delete_rec(rec);
 339                 if (!NT_STATUS_IS_OK(state->status)) {
 340                         return -1;
 341                 }
 342         }
 343
 344         return 0;
 345 }
 346
 347 NTSTATUS printer_list_clean_old(void)
 348 {
 349         struct printer_list_clean_state state;
 350         NTSTATUS status;
 351
 352         status = printer_list_get_last_refresh(&state.last_refresh);
 353         if (!NT_STATUS_IS_OK(status)) {
 354                 return status;
 355         }
 356
 357         state.status = NT_STATUS_OK;
 358
 359         status = printer_list_traverse(printer_list_clean_fn, &state);
 360         if (NT_STATUS_EQUAL(status, NT_STATUS_UNSUCCESSFUL) &&
 361             !NT_STATUS_IS_OK(state.status)) {
 362                 status = state.status;
 363         }
 364
 365         return status;
 366 }
 367
 368 struct printer_list_exec_state {
 369         void (*fn)(const char *, const char *, const char *, void *);
 370         void *private_data;
 371         NTSTATUS status;
 372 };
 373
 374 static int printer_list_exec_fn(struct db_record *rec, void *private_data)
 375 {
 376         struct printer_list_exec_state *state =
 377                         (struct printer_list_exec_state *)private_data;
 378         uint32_t time_h, time_l;
 379         char *name;
 380         char *comment;
 381         char *location;
 382         int ret;
 383
 384         /* always skip PL_TIMESTAMP_KEY key */
 385         if (strequal((const char *)rec->key.dptr, PL_TIMESTAMP_KEY)) {
 386                 return 0;
 387         }
 388
 389         ret = tdb_unpack(rec->value.dptr, rec->value.dsize,
 390                          PL_DATA_FORMAT, &time_h, &time_l, &name, &comment,
 391                          &location);
 392         if (ret == -1) {
 393                 DEBUG(1, ("Failed to un pack printer data"));
 394                 state->status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 395                 return -1;
 396         }
 397
 398         state->fn(name, comment, location, state->private_data);
 399
 400         SAFE_FREE(name);
 401         SAFE_FREE(comment);
 402         SAFE_FREE(location);
 403         return 0;
 404 }
 405
 406 NTSTATUS printer_list_run_fn(void (*fn)(const char *, const char *, const char *, void *),
 407                              void *private_data)
 408 {
 409         struct printer_list_exec_state state;
 410         NTSTATUS status;
 411
 412         state.fn = fn;
 413         state.private_data = private_data;
 414         state.status = NT_STATUS_OK;
 415
 416         status = printer_list_traverse(printer_list_exec_fn, &state);
 417         if (NT_STATUS_EQUAL(status, NT_STATUS_UNSUCCESSFUL) &&
 418             !NT_STATUS_IS_OK(state.status)) {
 419                 status = state.status;
 420         }
 421
 422         return status;
 423 }