source3/utils/net_cache.c

   1 /*
   2    Samba Unix/Linux SMB client library
   3    Distributed SMB/CIFS Server Management Utility
   4    Copyright (C) Rafal Szczesniak    2002
   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 "net.h"
  22
  23 /**
  24  * @file net_cache.c
  25  * @brief This is part of the net tool which is basically command
  26  *        line wrapper for gencache.c functions (mainly for testing)
  27  *
  28  **/
  29
  30
  31 /*
  32  * These routines are used via gencache_iterate() to display the cache's contents
  33  * (print_cache_entry) and to flush it (delete_cache_entry).
  34  * Both of them are defined by first arg of gencache_iterate() routine.
  35  */
  36 static void print_cache_entry(const char* keystr, DATA_BLOB value,
  37                               const time_t timeout, void* dptr)
  38 {
  39         char *timeout_str;
  40         char *alloc_str = NULL;
  41         const char *datastr;
  42         char *datastr_free = NULL;
  43         time_t now_t = time(NULL);
  44         struct tm timeout_tm, now_tm;
  45         struct tm *ptimeout_tm, *pnow_tm;
  46
  47         ptimeout_tm = localtime_r(&timeout, &timeout_tm);
  48         if (ptimeout_tm == NULL) {
  49                 return;
  50         }
  51         pnow_tm = localtime_r(&now_t, &now_tm);
  52         if (pnow_tm == NULL) {
  53                 return;
  54         }
  55
  56         /* form up timeout string depending whether it's today's date or not */
  57         if (timeout_tm.tm_year != now_tm.tm_year ||
  58                         timeout_tm.tm_mon != now_tm.tm_mon ||
  59                         timeout_tm.tm_mday != now_tm.tm_mday) {
  60
  61                 timeout_str = asctime(&timeout_tm);
  62                 if (!timeout_str) {
  63                         return;
  64                 }
  65                 timeout_str[strlen(timeout_str) - 1] = '\0';    /* remove tailing CR */
  66         } else {
  67                 if (asprintf(&alloc_str, "%.2d:%.2d:%.2d", timeout_tm.tm_hour,
  68                          timeout_tm.tm_min, timeout_tm.tm_sec) == -1) {
  69                         return;
  70                 }
  71                 timeout_str = alloc_str;
  72         }
  73
  74         datastr = (char *)value.data;
  75
  76         if ((value.length > 0) && (value.data[value.length-1] != '\0')) {
  77                 datastr_free = talloc_asprintf(
  78                         talloc_tos(), "<binary length %d>",
  79                         (int)value.length);
  80                 datastr = datastr_free;
  81                 if (datastr == NULL) {
  82                         datastr = "<binary>";
  83                 }
  84         }
  85
  86         d_printf(_("Key: %s\t Timeout: %s\t Value: %s  %s\n"), keystr,
  87                  timeout_str, datastr, timeout > now_t ? "": _("(expired)"));
  88
  89         SAFE_FREE(alloc_str);
  90 }
  91
  92 static void delete_cache_entry(const char* keystr, const char* datastr,
  93                                const time_t timeout, void* dptr)
  94 {
  95         if (!gencache_del(keystr))
  96                 d_fprintf(stderr, _("Couldn't delete entry! key = %s\n"),
  97                           keystr);
  98 }
  99
 100
 101 /**
 102  * Parse text representation of timeout value
 103  *
 104  * @param timeout_str string containing text representation of the timeout
 105  * @return numeric timeout of time_t type
 106  **/
 107 static time_t parse_timeout(const char* timeout_str)
 108 {
 109         char sign = '\0', *number = NULL, unit = '\0';
 110         int len, number_begin, number_end;
 111         time_t timeout;
 112
 113         /* sign detection */
 114         if (timeout_str[0] == '!' || timeout_str[0] == '+') {
 115                 sign = timeout_str[0];
 116                 number_begin = 1;
 117         } else {
 118                 number_begin = 0;
 119         }
 120
 121         /* unit detection */
 122         len = strlen(timeout_str);
 123         switch (timeout_str[len - 1]) {
 124         case 's':
 125         case 'm':
 126         case 'h':
 127         case 'd':
 128         case 'w': unit = timeout_str[len - 1];
 129         }
 130
 131         /* number detection */
 132         len = (sign) ? strlen(&timeout_str[number_begin]) : len;
 133         number_end = (unit) ? len - 1 : len;
 134         number = SMB_STRNDUP(&timeout_str[number_begin], number_end);
 135
 136         /* calculate actual timeout value */
 137         timeout = (time_t)atoi(number);
 138
 139         switch (unit) {
 140         case 'm': timeout *= 60; break;
 141         case 'h': timeout *= 60*60; break;
 142         case 'd': timeout *= 60*60*24; break;
 143         case 'w': timeout *= 60*60*24*7; break;  /* that's fair enough, I think :) */
 144         }
 145
 146         switch (sign) {
 147         case '!': timeout = time(NULL) - timeout; break;
 148         case '+':
 149         default:  timeout += time(NULL); break;
 150         }
 151
 152         if (number) SAFE_FREE(number);
 153         return timeout;
 154 }
 155
 156
 157 /**
 158  * Add an entry to the cache. If it does exist, then set it.
 159  *
 160  * @param c     A net_context structure
 161  * @param argv key, value and timeout are passed in command line
 162  * @return 0 on success, otherwise failure
 163  **/
 164 static int net_cache_add(struct net_context *c, int argc, const char **argv)
 165 {
 166         const char *keystr, *datastr, *timeout_str;
 167         time_t timeout;
 168
 169         if (argc < 3 || c->display_usage) {
 170                 d_printf("%s\n%s",
 171                          _("Usage:"),
 172                          _("net cache add <key string> <data string> "
 173                            "<timeout>\n"));
 174                 return -1;
 175         }
 176
 177         keystr = argv[0];
 178         datastr = argv[1];
 179         timeout_str = argv[2];
 180
 181         /* parse timeout given in command line */
 182         timeout = parse_timeout(timeout_str);
 183         if (!timeout) {
 184                 d_fprintf(stderr, _("Invalid timeout argument.\n"));
 185                 return -1;
 186         }
 187
 188         if (gencache_set(keystr, datastr, timeout)) {
 189                 d_printf(_("New cache entry stored successfully.\n"));
 190                 return 0;
 191         }
 192
 193         d_fprintf(stderr, _("Entry couldn't be added. Perhaps there's already such a key.\n"));
 194         return -1;
 195 }
 196
 197 /**
 198  * Delete an entry in the cache
 199  *
 200  * @param c     A net_context structure
 201  * @param argv key to delete an entry of
 202  * @return 0 on success, otherwise failure
 203  **/
 204 static int net_cache_del(struct net_context *c, int argc, const char **argv)
 205 {
 206         const char *keystr = argv[0];
 207
 208         if (argc < 1 || c->display_usage) {
 209                 d_printf("%s\n%s",
 210                          _("Usage:"),
 211                          _(" net cache del <key string>\n"));
 212                 return -1;
 213         }
 214
 215         if(gencache_del(keystr)) {
 216                 d_printf(_("Entry deleted.\n"));
 217                 return 0;
 218         }
 219
 220         d_fprintf(stderr, _("Couldn't delete specified entry\n"));
 221         return -1;
 222 }
 223
 224
 225 /**
 226  * Get and display an entry from the cache
 227  *
 228  * @param c     A net_context structure
 229  * @param argv key to search an entry of
 230  * @return 0 on success, otherwise failure
 231  **/
 232 static int net_cache_get(struct net_context *c, int argc, const char **argv)
 233 {
 234         const char* keystr = argv[0];
 235         DATA_BLOB value;
 236         time_t timeout;
 237
 238         if (argc < 1 || c->display_usage) {
 239                 d_printf("%s\n%s",
 240                          _("Usage:"),
 241                          _(" net cache get <key>\n"));
 242                 return -1;
 243         }
 244
 245         if (gencache_get_data_blob(keystr, &value, &timeout, NULL)) {
 246                 print_cache_entry(keystr, value, timeout, NULL);
 247                 data_blob_free(&value);
 248                 return 0;
 249         }
 250
 251         d_fprintf(stderr, _("Failed to find entry\n"));
 252         return -1;
 253 }
 254
 255
 256 /**
 257  * Search an entry/entries in the cache
 258  *
 259  * @param c     A net_context structure
 260  * @param argv key pattern to match the entries to
 261  * @return 0 on success, otherwise failure
 262  **/
 263 static int net_cache_search(struct net_context *c, int argc, const char **argv)
 264 {
 265         const char* pattern;
 266
 267         if (argc < 1 || c->display_usage) {
 268                 d_printf("%s\n%s",
 269                          _("Usage:"),
 270                          _(" net cache search <pattern>\n"));
 271                 return -1;
 272         }
 273
 274         pattern = argv[0];
 275         gencache_iterate_blobs(print_cache_entry, NULL, pattern);
 276         return 0;
 277 }
 278
 279
 280 /**
 281  * List the contents of the cache
 282  *
 283  * @param c     A net_context structure
 284  * @param argv ignored in this functionailty
 285  * @return always returns 0
 286  **/
 287 static int net_cache_list(struct net_context *c, int argc, const char **argv)
 288 {
 289         const char* pattern = "*";
 290
 291         if (c->display_usage) {
 292                 d_printf(  "%s\n"
 293                            "net cache list\n"
 294                            "    %s\n",
 295                          _("Usage:"),
 296                          _("List all cache entries."));
 297                 return 0;
 298         }
 299         gencache_iterate_blobs(print_cache_entry, NULL, pattern);
 300         return 0;
 301 }
 302
 303
 304 /**
 305  * Flush the whole cache
 306  *
 307  * @param c     A net_context structure
 308  * @param argv ignored in this functionality
 309  * @return always returns 0
 310  **/
 311 static int net_cache_flush(struct net_context *c, int argc, const char **argv)
 312 {
 313         const char* pattern = "*";
 314         if (c->display_usage) {
 315                 d_printf(  "%s\n"
 316                            "net cache flush\n"
 317                            "    %s",
 318                          _("Usage:"),
 319                          _("Delete all cache entries."));
 320                 return 0;
 321         }
 322         gencache_iterate(delete_cache_entry, NULL, pattern);
 323         return 0;
 324 }
 325
 326 static int net_cache_stabilize(struct net_context *c, int argc,
 327                                const char **argv)
 328 {
 329         if (c->display_usage) {
 330                 d_printf(  "%s\n"
 331                            "net cache stabilize\n"
 332                            "    %s\n",
 333                          _("Usage:"),
 334                          _("Move transient cache content to stable storage"));
 335                 return 0;
 336         }
 337
 338         if (!gencache_stabilize()) {
 339                 return -1;
 340         }
 341         return 0;
 342 }
 343 /**
 344  * Entry point to 'net cache' subfunctionality
 345  *
 346  * @param c     A net_context structure
 347  * @param argv arguments passed to further called functions
 348  * @return whatever further functions return
 349  **/
 350 int net_cache(struct net_context *c, int argc, const char **argv)
 351 {
 352         struct functable func[] = {
 353                 {
 354                         "add",
 355                         net_cache_add,
 356                         NET_TRANSPORT_LOCAL,
 357                         N_("Add new cache entry"),
 358                         N_("net cache add <key string> <data string> <timeout>\n"
 359                            "  Add new cache entry.\n"
 360                            "    key string\tKey string to add cache data under.\n"
 361                            "    data string\tData to store under given key.\n"
 362                            "    timeout\tTimeout for cache data.")
 363                 },
 364                 {
 365                         "del",
 366                         net_cache_del,
 367                         NET_TRANSPORT_LOCAL,
 368                         N_("Delete existing cache entry by key"),
 369                         N_("net cache del <key string>\n"
 370                            "  Delete existing cache entry by key.\n"
 371                            "    key string\tKey string to delete.")
 372                 },
 373                 {
 374                         "get",
 375                         net_cache_get,
 376                         NET_TRANSPORT_LOCAL,
 377                         N_("Get cache entry by key"),
 378                         N_("net cache get <key string>\n"
 379                            "  Get cache entry by key.\n"
 380                            "    key string\tKey string to look up cache entry for.")
 381
 382                 },
 383                 {
 384                         "search",
 385                         net_cache_search,
 386                         NET_TRANSPORT_LOCAL,
 387                         N_("Search entry by pattern"),
 388                         N_("net cache search <pattern>\n"
 389                            "  Search entry by pattern.\n"
 390                            "    pattern\tPattern to search for in cache.")
 391                 },
 392                 {
 393                         "list",
 394                         net_cache_list,
 395                         NET_TRANSPORT_LOCAL,
 396                         N_("List all cache entries"),
 397                         N_("net cache list\n"
 398                            "  List all cache entries")
 399                 },
 400                 {
 401                         "flush",
 402                         net_cache_flush,
 403                         NET_TRANSPORT_LOCAL,
 404                         N_("Delete all cache entries"),
 405                         N_("net cache flush\n"
 406                            "  Delete all cache entries")
 407                 },
 408                 {
 409                         "stabilize",
 410                         net_cache_stabilize,
 411                         NET_TRANSPORT_LOCAL,
 412                         N_("Move transient cache content to stable storage"),
 413                         N_("net cache stabilize\n"
 414                            "  Move transient cache content to stable storage")
 415                 },
 416                 {NULL, NULL, 0, NULL, NULL}
 417         };
 418
 419         return net_run_function(c, argc, argv, "net cache", func);
 420 }