utils/net_cache.c

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/* 
   Samba Unix/Linux SMB client library 
   Distributed SMB/CIFS Server Management Utility 
   Copyright (C) Rafal Szczesniak    2002

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 

#include "includes.h"
#include "net.h"

/**
 * @file net_cache.c
 * @brief This is part of the net tool which is basically command
 *        line wrapper for gencache.c functions (mainly for testing)
 *
 **/


/*
 * These routines are used via gencache_iterate() to display the cache's contents
 * (print_cache_entry) and to flush it (delete_cache_entry).
 * Both of them are defined by first arg of gencache_iterate() routine.
 */
static void print_cache_entry(const char* keystr, const char* datastr,
                              const time_t timeout, void* dptr)
{
        char *timeout_str;
        char *alloc_str = NULL;
        time_t now_t = time(NULL);
        struct tm timeout_tm, *now_tm;
        /* localtime returns statically allocated pointer, so timeout_tm
           has to be copied somewhere else */

        now_tm = localtime(&timeout);
        if (!now_tm) {
                return;
        }
        memcpy(&timeout_tm, now_tm, sizeof(struct tm));
        now_tm = localtime(&now_t);
        if (!now_tm) {
                return;
        }

        /* form up timeout string depending whether it's today's date or not */
        if (timeout_tm.tm_year != now_tm->tm_year ||
                        timeout_tm.tm_mon != now_tm->tm_mon ||
                        timeout_tm.tm_mday != now_tm->tm_mday) {
            
                timeout_str = asctime(&timeout_tm);
                if (!timeout_str) {
                        return;
                }       
                timeout_str[strlen(timeout_str) - 1] = '\0';    /* remove tailing CR */
        } else {
                asprintf(&alloc_str, "%.2d:%.2d:%.2d", timeout_tm.tm_hour,
                         timeout_tm.tm_min, timeout_tm.tm_sec);
                if (!alloc_str) {
                        return;
                }
                timeout_str = alloc_str;
        }
        
        d_printf("Key: %s\t Timeout: %s\t Value: %s  %s\n", keystr,
                 timeout_str, datastr, timeout > now_t ? "": "(expired)");

        SAFE_FREE(alloc_str);
}

static void delete_cache_entry(const char* keystr, const char* datastr,
                               const time_t timeout, void* dptr)
{
        if (!gencache_del(keystr))
                d_fprintf(stderr, "Couldn't delete entry! key = %s\n", keystr);
}


/**
 * Parse text representation of timeout value
 *
 * @param timeout_str string containing text representation of the timeout
 * @return numeric timeout of time_t type
 **/
static time_t parse_timeout(const char* timeout_str)
{
        char sign = '\0', *number = NULL, unit = '\0';
        int len, number_begin, number_end;
        time_t timeout;

        /* sign detection */
        if (timeout_str[0] == '!' || timeout_str[0] == '+') {
                sign = timeout_str[0];
                number_begin = 1;
        } else {
                number_begin = 0;
        }
        
        /* unit detection */
        len = strlen(timeout_str);
        switch (timeout_str[len - 1]) {
        case 's':
        case 'm':
        case 'h':
        case 'd':
        case 'w': unit = timeout_str[len - 1];
        }
        
        /* number detection */
        len = (sign) ? strlen(&timeout_str[number_begin]) : len;
        number_end = (unit) ? len - 1 : len;
        number = SMB_STRNDUP(&timeout_str[number_begin], number_end);
        
        /* calculate actual timeout value */
        timeout = (time_t)atoi(number);

        switch (unit) {
        case 'm': timeout *= 60; break;
        case 'h': timeout *= 60*60; break;
        case 'd': timeout *= 60*60*24; break;
        case 'w': timeout *= 60*60*24*7; break;  /* that's fair enough, I think :) */
        }
        
        switch (sign) {
        case '!': timeout = time(NULL) - timeout; break;
        case '+':
        default:  timeout += time(NULL); break;
        }
        
        if (number) SAFE_FREE(number);
        return timeout; 
}


/**
 * Add an entry to the cache. If it does exist, then set it.
 * 
 * @param argv key, value and timeout are passed in command line
 * @return 0 on success, otherwise failure
 **/
static int net_cache_add(int argc, const char **argv)
{
        const char *keystr, *datastr, *timeout_str;
        time_t timeout;
        
        if (argc < 3) {
                d_printf("\nUsage: net cache add <key string> <data string> <timeout>\n");
                return -1;
        }
        
        keystr = argv[0];
        datastr = argv[1];
        timeout_str = argv[2];
        
        /* parse timeout given in command line */
        timeout = parse_timeout(timeout_str);
        if (!timeout) {
                d_fprintf(stderr, "Invalid timeout argument.\n");
                return -1;
        }
        
        if (gencache_set(keystr, datastr, timeout)) {
                d_printf("New cache entry stored successfully.\n");
                gencache_shutdown();
                return 0;
        }
        
        d_fprintf(stderr, "Entry couldn't be added. Perhaps there's already such a key.\n");
        gencache_shutdown();
        return -1;
}

/**
 * Delete an entry in the cache
 * 
 * @param argv key to delete an entry of
 * @return 0 on success, otherwise failure
 **/
static int net_cache_del(int argc, const char **argv)
{
        const char *keystr = argv[0];
        
        if (argc < 1) {
                d_printf("\nUsage: net cache del <key string>\n");
                return -1;
        }
        
        if(gencache_del(keystr)) {
                d_printf("Entry deleted.\n");
                return 0;
        }

        d_fprintf(stderr, "Couldn't delete specified entry\n");
        return -1;
}


/**
 * Get and display an entry from the cache
 * 
 * @param argv key to search an entry of
 * @return 0 on success, otherwise failure
 **/
static int net_cache_get(int argc, const char **argv)
{
        const char* keystr = argv[0];
        char* valuestr;
        time_t timeout;

        if (argc < 1) {
                d_printf("\nUsage: net cache get <key>\n");
                return -1;
        }
        
        if (gencache_get(keystr, &valuestr, &timeout)) {
                print_cache_entry(keystr, valuestr, timeout, NULL);
                return 0;
        }

        d_fprintf(stderr, "Failed to find entry\n");
        return -1;
}


/**
 * Search an entry/entries in the cache
 * 
 * @param argv key pattern to match the entries to
 * @return 0 on success, otherwise failure
 **/
static int net_cache_search(int argc, const char **argv)
{
        const char* pattern;
        
        if (argc < 1) {
                d_printf("Usage: net cache search <pattern>\n");
                return -1;
        }
        
        pattern = argv[0];
        gencache_iterate(print_cache_entry, NULL, pattern);
        return 0;
}


/**
 * List the contents of the cache
 * 
 * @param argv ignored in this functionailty
 * @return always returns 0
 **/
static int net_cache_list(int argc, const char **argv)
{
        const char* pattern = "*";
        gencache_iterate(print_cache_entry, NULL, pattern);
        gencache_shutdown();
        return 0;
}


/**
 * Flush the whole cache
 * 
 * @param argv ignored in this functionality
 * @return always returns 0
 **/
static int net_cache_flush(int argc, const char **argv)
{
        const char* pattern = "*";
        gencache_iterate(delete_cache_entry, NULL, pattern);
        gencache_shutdown();
        return 0;
}


/**
 * Short help
 *
 * @param argv ignored in this functionality
 * @return always returns -1
 **/
static int net_cache_usage(int argc, const char **argv)
{
        d_printf("  net cache add \t add add new cache entry\n");
        d_printf("  net cache del \t delete existing cache entry by key\n");
        d_printf("  net cache flush \t delete all entries existing in the cache\n");
        d_printf("  net cache get \t get cache entry by key\n");
        d_printf("  net cache search \t search for entries in the cache, by given pattern\n");
        d_printf("  net cache list \t list all cache entries (just like search for \"*\")\n");
        return -1;
}


/**
 * Entry point to 'net cache' subfunctionality
 *
 * @param argv arguments passed to further called functions
 * @return whatever further functions return
 **/
int net_cache(int argc, const char **argv)
{
        struct functable func[] = {
                {"add", net_cache_add},
                {"del", net_cache_del},
                {"get", net_cache_get},
                {"search", net_cache_search},
                {"list", net_cache_list},
                {"flush", net_cache_flush},
                {NULL, NULL}
        };

        return net_run_function(argc, argv, func, net_cache_usage);
}

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