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 2 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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 #include "includes.h"
  22 #include "net.h"
  23
  24 /**
  25  * @file net_cache.c
  26  * @brief This is part of the net tool which is basically command
  27  *        line wrapper for gencache.c functions (mainly for testing)
  28  *
  29  **/
  30
  31
  32 /*
  33  * These routines are used via gencache_iterate() to display the cache's contents
  34  * (print_cache_entry) and to flush it (delete_cache_entry).
  35  * Both of them are defined by first arg of gencache_iterate() routine.
  36  */
  37 static void print_cache_entry(const char* keystr, const char* datastr,
  38                               const time_t timeout, void* dptr)
  39 {
  40         char* timeout_str;
  41         time_t now_t = time(NULL);
  42         struct tm timeout_tm, *now_tm;
  43         /* localtime returns statically allocated pointer, so timeout_tm
  44            has to be copied somewhere else */
  45         memcpy(&timeout_tm, localtime(&timeout), sizeof(struct tm));
  46         now_tm = localtime(&now_t);
  47
  48         /* form up timeout string depending whether it's today's date or not */
  49         if (timeout_tm.tm_year != now_tm->tm_year ||
  50             timeout_tm.tm_mon != now_tm->tm_mon ||
  51             timeout_tm.tm_mday != now_tm->tm_mday) {
  52
  53             timeout_str = asctime(&timeout_tm);
  54             timeout_str[strlen(timeout_str) - 1] = '\0';        /* remove tailing CR */
  55         } else
  56                 asprintf(&timeout_str, "%.2d:%.2d:%.2d", timeout_tm.tm_hour,
  57                          timeout_tm.tm_min, timeout_tm.tm_sec);
  58
  59         d_printf("Key: %s\t Timeout: %s\t Value: %s  %s\n", keystr,
  60                  timeout_str, datastr, timeout > now_t ? "": "(expired)");
  61 }
  62
  63 static void delete_cache_entry(const char* keystr, const char* datastr,
  64                                const time_t timeout, void* dptr)
  65 {
  66         if (!gencache_del(keystr))
  67                 d_printf("Couldn't delete entry! key = %s\n", keystr);
  68 }
  69
  70
  71 /**
  72  * Parse text representation of timeout value
  73  *
  74  * @param timeout_str string containing text representation of the timeout
  75  * @return numeric timeout of time_t type
  76  **/
  77 static time_t parse_timeout(const char* timeout_str)
  78 {
  79         char sign = '\0', *number = NULL, unit = '\0';
  80         int len, number_begin, number_end;
  81         time_t timeout;
  82
  83         /* sign detection */
  84         if (timeout_str[0] == '!' || timeout_str[0] == '+') {
  85                 sign = timeout_str[0];
  86                 number_begin = 1;
  87         } else {
  88                 number_begin = 0;
  89         }
  90
  91         /* unit detection */
  92         len = strlen(timeout_str);
  93         switch (timeout_str[len - 1]) {
  94         case 's':
  95         case 'm':
  96         case 'h':
  97         case 'd':
  98         case 'w': unit = timeout_str[len - 1];
  99         }
 100
 101         /* number detection */
 102         len = (sign) ? strlen(&timeout_str[number_begin]) : len;
 103         number_end = (unit) ? len - 1 : len;
 104         number = strndup(&timeout_str[number_begin], number_end);
 105
 106         /* calculate actual timeout value */
 107         timeout = (time_t)atoi(number);
 108
 109         switch (unit) {
 110         case 'm': timeout *= 60; break;
 111         case 'h': timeout *= 60*60; break;
 112         case 'd': timeout *= 60*60*24; break;
 113         case 'w': timeout *= 60*60*24*7; break;  /* that's fair enough, I think :) */
 114         }
 115
 116         switch (sign) {
 117         case '!': timeout = time(NULL) - timeout; break;
 118         case '+':
 119         default:  timeout += time(NULL); break;
 120         }
 121
 122         if (number) SAFE_FREE(number);
 123         return timeout;
 124 }
 125
 126
 127 /**
 128  * Add an entry to the cache. If it does exist, then set it.
 129  *
 130  * @param argv key, value and timeout are passed in command line
 131  * @return 0 on success, otherwise failure
 132  **/
 133 static int net_cache_add(int argc, const char **argv)
 134 {
 135         const char *keystr, *datastr, *timeout_str;
 136         time_t timeout;
 137
 138         if (argc < 3) {
 139                 d_printf("\nUsage: net cache add <key string> <data string> <timeout>\n");
 140                 return -1;
 141         }
 142
 143         keystr = argv[0];
 144         datastr = argv[1];
 145         timeout_str = argv[2];
 146
 147         /* parse timeout given in command line */
 148         timeout = parse_timeout(timeout_str);
 149         if (!timeout) {
 150                 d_printf("Invalid timeout argument.\n");
 151                 return -1;
 152         }
 153
 154         if (gencache_set(keystr, datastr, timeout)) {
 155                 d_printf("New cache entry stored successfully.\n");
 156                 gencache_shutdown();
 157                 return 0;
 158         }
 159
 160         d_printf("Entry couldn't be added. Perhaps there's already such a key.\n");
 161         gencache_shutdown();
 162         return -1;
 163 }
 164
 165
 166 /**
 167  * Set new value of an existing entry in the cache. Fail If the entry doesn't
 168  * exist.
 169  *
 170  * @param argv key being searched and new value and timeout to set in the entry
 171  * @return 0 on success, otherwise failure
 172  **/
 173 static int net_cache_set(int argc, const char **argv)
 174 {
 175         const char *keystr, *datastr, *timeout_str;
 176         time_t timeout;
 177
 178         if (argc < 3) {
 179                 d_printf("\nUsage: net cache set <key string> <data string> <timeout>\n");
 180                 return -1;
 181         }
 182
 183         keystr = argv[0];
 184         datastr = argv[1];
 185         timeout_str = argv[2];
 186
 187         /* parse timeout given in command line */
 188         timeout = parse_timeout(timeout_str);
 189         if (!timeout) {
 190                 d_printf("Invalid timeout argument.\n");
 191                 return -1;
 192         }
 193
 194         if (gencache_set_only(keystr, datastr, timeout)) {
 195                 d_printf("Cache entry set successfully.\n");
 196                 gencache_shutdown();
 197                 return 0;
 198         }
 199
 200         d_printf("Entry couldn't be set. Perhaps there's no such a key.\n");
 201         gencache_shutdown();
 202         return -1;
 203 }
 204
 205
 206 /**
 207  * Delete an entry in the cache
 208  *
 209  * @param argv key to delete an entry of
 210  * @return 0 on success, otherwise failure
 211  **/
 212 static int net_cache_del(int argc, const char **argv)
 213 {
 214         const char *keystr = argv[0];
 215
 216         if (argc < 1) {
 217                 d_printf("\nUsage: net cache del <key string>\n");
 218                 return -1;
 219         }
 220
 221         if(gencache_del(keystr)) {
 222                 d_printf("Entry deleted.\n");
 223                 return 0;
 224         }
 225
 226         d_printf("Couldn't delete specified entry\n");
 227         return -1;
 228 }
 229
 230
 231 /**
 232  * Get and display an entry from the cache
 233  *
 234  * @param argv key to search an entry of
 235  * @return 0 on success, otherwise failure
 236  **/
 237 static int net_cache_get(int argc, const char **argv)
 238 {
 239         const char* keystr = argv[0];
 240         char* valuestr;
 241         time_t timeout;
 242
 243         if (argc < 1) {
 244                 d_printf("\nUsage: net cache get <key>\n");
 245                 return -1;
 246         }
 247
 248         if (gencache_get(keystr, &valuestr, &timeout)) {
 249                 print_cache_entry(keystr, valuestr, timeout, NULL);
 250                 return 0;
 251         }
 252
 253         d_printf("Failed to find entry\n");
 254         return -1;
 255 }
 256
 257
 258 /**
 259  * Search an entry/entries in the cache
 260  *
 261  * @param argv key pattern to match the entries to
 262  * @return 0 on success, otherwise failure
 263  **/
 264 static int net_cache_search(int argc, const char **argv)
 265 {
 266         const char* pattern;
 267
 268         if (argc < 1) {
 269                 d_printf("Usage: net cache search <pattern>\n");
 270                 return -1;
 271         }
 272
 273         pattern = argv[0];
 274         gencache_iterate(print_cache_entry, NULL, pattern);
 275         return 0;
 276 }
 277
 278
 279 /**
 280  * List the contents of the cache
 281  *
 282  * @param argv ignored in this functionailty
 283  * @return always returns 0
 284  **/
 285 static int net_cache_list(int argc, const char **argv)
 286 {
 287         const char* pattern = "*";
 288         gencache_iterate(print_cache_entry, NULL, pattern);
 289         gencache_shutdown();
 290         return 0;
 291 }
 292
 293
 294 /**
 295  * Flush the whole cache
 296  *
 297  * @param argv ignored in this functionality
 298  * @return always returns 0
 299  **/
 300 static int net_cache_flush(int argc, const char **argv)
 301 {
 302         const char* pattern = "*";
 303         gencache_iterate(delete_cache_entry, NULL, pattern);
 304         gencache_shutdown();
 305         return 0;
 306 }
 307
 308
 309 /**
 310  * Short help
 311  *
 312  * @param argv ignored in this functionality
 313  * @return always returns -1
 314  **/
 315 static int net_cache_usage(int argc, const char **argv)
 316 {
 317         d_printf("  net cache add \t add add new cache entry\n");
 318         d_printf("  net cache set \t set new value for existing cache entry\n");
 319         d_printf("  net cache del \t delete existing cache entry by key\n");
 320         d_printf("  net cache flush \t delete all entries existing in the cache\n");
 321         d_printf("  net cache get \t get cache entry by key\n");
 322         d_printf("  net cache search \t search for entries in the cache, by given pattern\n");
 323         d_printf("  net cache list \t list all cache entries (just like search for \"*\")\n");
 324         return -1;
 325 }
 326
 327
 328 /**
 329  * Entry point to 'net cache' subfunctionality
 330  *
 331  * @param argv arguments passed to further called functions
 332  * @return whatever further functions return
 333  **/
 334 int net_cache(int argc, const char **argv)
 335 {
 336         struct functable func[] = {
 337                 {"add", net_cache_add},
 338                 {"set", net_cache_set},
 339                 {"del", net_cache_del},
 340                 {"get", net_cache_get},
 341                 {"search", net_cache_search},
 342                 {"list", net_cache_list},
 343                 {"flush", net_cache_flush},
 344                 {NULL, NULL}
 345         };
 346
 347         return net_run_function(argc, argv, func, net_cache_usage);
 348 }