source/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         char *alloc_str = NULL;
  42         time_t now_t = time(NULL);
  43         struct tm timeout_tm, *now_tm;
  44         /* localtime returns statically allocated pointer, so timeout_tm
  45            has to be copied somewhere else */
  46
  47         now_tm = localtime(&timeout);
  48         if (!now_tm) {
  49                 return;
  50         }
  51         memcpy(&timeout_tm, now_tm, sizeof(struct tm));
  52         now_tm = localtime(&now_t);
  53         if (!now_tm) {
  54                 return;
  55         }
  56
  57         /* form up timeout string depending whether it's today's date or not */
  58         if (timeout_tm.tm_year != now_tm->tm_year ||
  59                         timeout_tm.tm_mon != now_tm->tm_mon ||
  60                         timeout_tm.tm_mday != now_tm->tm_mday) {
  61
  62                 timeout_str = asctime(&timeout_tm);
  63                 if (!timeout_str) {
  64                         return;
  65                 }
  66                 timeout_str[strlen(timeout_str) - 1] = '\0';    /* remove tailing CR */
  67         } else {
  68                 asprintf(&alloc_str, "%.2d:%.2d:%.2d", timeout_tm.tm_hour,
  69                          timeout_tm.tm_min, timeout_tm.tm_sec);
  70                 if (!alloc_str) {
  71                         return;
  72                 }
  73                 timeout_str = alloc_str;
  74         }
  75
  76         d_printf("Key: %s\t Timeout: %s\t Value: %s  %s\n", keystr,
  77                  timeout_str, datastr, timeout > now_t ? "": "(expired)");
  78
  79         SAFE_FREE(alloc_str);
  80 }
  81
  82 static void delete_cache_entry(const char* keystr, const char* datastr,
  83                                const time_t timeout, void* dptr)
  84 {
  85         if (!gencache_del(keystr))
  86                 d_fprintf(stderr, "Couldn't delete entry! key = %s\n", keystr);
  87 }
  88
  89
  90 /**
  91  * Parse text representation of timeout value
  92  *
  93  * @param timeout_str string containing text representation of the timeout
  94  * @return numeric timeout of time_t type
  95  **/
  96 static time_t parse_timeout(const char* timeout_str)
  97 {
  98         char sign = '\0', *number = NULL, unit = '\0';
  99         int len, number_begin, number_end;
 100         time_t timeout;
 101
 102         /* sign detection */
 103         if (timeout_str[0] == '!' || timeout_str[0] == '+') {
 104                 sign = timeout_str[0];
 105                 number_begin = 1;
 106         } else {
 107                 number_begin = 0;
 108         }
 109
 110         /* unit detection */
 111         len = strlen(timeout_str);
 112         switch (timeout_str[len - 1]) {
 113         case 's':
 114         case 'm':
 115         case 'h':
 116         case 'd':
 117         case 'w': unit = timeout_str[len - 1];
 118         }
 119
 120         /* number detection */
 121         len = (sign) ? strlen(&timeout_str[number_begin]) : len;
 122         number_end = (unit) ? len - 1 : len;
 123         number = SMB_STRNDUP(&timeout_str[number_begin], number_end);
 124
 125         /* calculate actual timeout value */
 126         timeout = (time_t)atoi(number);
 127
 128         switch (unit) {
 129         case 'm': timeout *= 60; break;
 130         case 'h': timeout *= 60*60; break;
 131         case 'd': timeout *= 60*60*24; break;
 132         case 'w': timeout *= 60*60*24*7; break;  /* that's fair enough, I think :) */
 133         }
 134
 135         switch (sign) {
 136         case '!': timeout = time(NULL) - timeout; break;
 137         case '+':
 138         default:  timeout += time(NULL); break;
 139         }
 140
 141         if (number) SAFE_FREE(number);
 142         return timeout;
 143 }
 144
 145
 146 /**
 147  * Add an entry to the cache. If it does exist, then set it.
 148  *
 149  * @param argv key, value and timeout are passed in command line
 150  * @return 0 on success, otherwise failure
 151  **/
 152 static int net_cache_add(int argc, const char **argv)
 153 {
 154         const char *keystr, *datastr, *timeout_str;
 155         time_t timeout;
 156
 157         if (argc < 3) {
 158                 d_printf("\nUsage: net cache add <key string> <data string> <timeout>\n");
 159                 return -1;
 160         }
 161
 162         keystr = argv[0];
 163         datastr = argv[1];
 164         timeout_str = argv[2];
 165
 166         /* parse timeout given in command line */
 167         timeout = parse_timeout(timeout_str);
 168         if (!timeout) {
 169                 d_fprintf(stderr, "Invalid timeout argument.\n");
 170                 return -1;
 171         }
 172
 173         if (gencache_set(keystr, datastr, timeout)) {
 174                 d_printf("New cache entry stored successfully.\n");
 175                 gencache_shutdown();
 176                 return 0;
 177         }
 178
 179         d_fprintf(stderr, "Entry couldn't be added. Perhaps there's already such a key.\n");
 180         gencache_shutdown();
 181         return -1;
 182 }
 183
 184 /**
 185  * Delete an entry in the cache
 186  *
 187  * @param argv key to delete an entry of
 188  * @return 0 on success, otherwise failure
 189  **/
 190 static int net_cache_del(int argc, const char **argv)
 191 {
 192         const char *keystr = argv[0];
 193
 194         if (argc < 1) {
 195                 d_printf("\nUsage: net cache del <key string>\n");
 196                 return -1;
 197         }
 198
 199         if(gencache_del(keystr)) {
 200                 d_printf("Entry deleted.\n");
 201                 return 0;
 202         }
 203
 204         d_fprintf(stderr, "Couldn't delete specified entry\n");
 205         return -1;
 206 }
 207
 208
 209 /**
 210  * Get and display an entry from the cache
 211  *
 212  * @param argv key to search an entry of
 213  * @return 0 on success, otherwise failure
 214  **/
 215 static int net_cache_get(int argc, const char **argv)
 216 {
 217         const char* keystr = argv[0];
 218         char* valuestr;
 219         time_t timeout;
 220
 221         if (argc < 1) {
 222                 d_printf("\nUsage: net cache get <key>\n");
 223                 return -1;
 224         }
 225
 226         if (gencache_get(keystr, &valuestr, &timeout)) {
 227                 print_cache_entry(keystr, valuestr, timeout, NULL);
 228                 return 0;
 229         }
 230
 231         d_fprintf(stderr, "Failed to find entry\n");
 232         return -1;
 233 }
 234
 235
 236 /**
 237  * Search an entry/entries in the cache
 238  *
 239  * @param argv key pattern to match the entries to
 240  * @return 0 on success, otherwise failure
 241  **/
 242 static int net_cache_search(int argc, const char **argv)
 243 {
 244         const char* pattern;
 245
 246         if (argc < 1) {
 247                 d_printf("Usage: net cache search <pattern>\n");
 248                 return -1;
 249         }
 250
 251         pattern = argv[0];
 252         gencache_iterate(print_cache_entry, NULL, pattern);
 253         return 0;
 254 }
 255
 256
 257 /**
 258  * List the contents of the cache
 259  *
 260  * @param argv ignored in this functionailty
 261  * @return always returns 0
 262  **/
 263 static int net_cache_list(int argc, const char **argv)
 264 {
 265         const char* pattern = "*";
 266         gencache_iterate(print_cache_entry, NULL, pattern);
 267         gencache_shutdown();
 268         return 0;
 269 }
 270
 271
 272 /**
 273  * Flush the whole cache
 274  *
 275  * @param argv ignored in this functionality
 276  * @return always returns 0
 277  **/
 278 static int net_cache_flush(int argc, const char **argv)
 279 {
 280         const char* pattern = "*";
 281         gencache_iterate(delete_cache_entry, NULL, pattern);
 282         gencache_shutdown();
 283         return 0;
 284 }
 285
 286
 287 /**
 288  * Short help
 289  *
 290  * @param argv ignored in this functionality
 291  * @return always returns -1
 292  **/
 293 static int net_cache_usage(int argc, const char **argv)
 294 {
 295         d_printf("  net cache add \t add add new cache entry\n");
 296         d_printf("  net cache del \t delete existing cache entry by key\n");
 297         d_printf("  net cache flush \t delete all entries existing in the cache\n");
 298         d_printf("  net cache get \t get cache entry by key\n");
 299         d_printf("  net cache search \t search for entries in the cache, by given pattern\n");
 300         d_printf("  net cache list \t list all cache entries (just like search for \"*\")\n");
 301         return -1;
 302 }
 303
 304
 305 /**
 306  * Entry point to 'net cache' subfunctionality
 307  *
 308  * @param argv arguments passed to further called functions
 309  * @return whatever further functions return
 310  **/
 311 int net_cache(int argc, const char **argv)
 312 {
 313         struct functable func[] = {
 314                 {"add", net_cache_add},
 315                 {"del", net_cache_del},
 316                 {"get", net_cache_get},
 317                 {"search", net_cache_search},
 318                 {"list", net_cache_list},
 319                 {"flush", net_cache_flush},
 320                 {NULL, NULL}
 321         };
 322
 323         return net_run_function(argc, argv, func, net_cache_usage);
 324 }