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      1 /*
      2  * roc_driver.c
      3  *
      4  * test driver for rollover counter replay implementation
      5  *
      6  * David A. McGrew
      7  * Cisco Systems, Inc.
      8  */
      9 
     10 /*
     11  *
     12  * Copyright (c) 2001-2006, Cisco Systems, Inc.
     13  * All rights reserved.
     14  *
     15  * Redistribution and use in source and binary forms, with or without
     16  * modification, are permitted provided that the following conditions
     17  * are met:
     18  *
     19  *   Redistributions of source code must retain the above copyright
     20  *   notice, this list of conditions and the following disclaimer.
     21  *
     22  *   Redistributions in binary form must reproduce the above
     23  *   copyright notice, this list of conditions and the following
     24  *   disclaimer in the documentation and/or other materials provided
     25  *   with the distribution.
     26  *
     27  *   Neither the name of the Cisco Systems, Inc. nor the names of its
     28  *   contributors may be used to endorse or promote products derived
     29  *   from this software without specific prior written permission.
     30  *
     31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     34  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     35  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     36  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     37  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     38  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     41  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
     42  * OF THE POSSIBILITY OF SUCH DAMAGE.
     43  *
     44  */
     45 
     46 
     47 #include <stdio.h>
     48 
     49 /*
     50  * defining ROC_TEST causes small datatypes to be used in
     51  * xtd_seq_num_t - this allows the functions to be exhaustively tested.
     52  */
     53 #if ROC_NEEDS_TO_BE_TESTED
     54 #define ROC_TEST
     55 #endif
     56 
     57 #include "rdbx.h"
     58 #include "ut_sim.h"
     59 
     60 err_status_t
     61 roc_test(int num_trials);
     62 
     63 int
     64 main (void) {
     65   err_status_t status;
     66 
     67   printf("rollover counter test driver\n"
     68 	 "David A. McGrew\n"
     69 	 "Cisco Systems, Inc.\n");
     70 
     71   printf("testing index functions...");
     72   status = roc_test(1 << 18);
     73   if (status) {
     74     printf("failed\n");
     75     exit(status);
     76   }
     77   printf("passed\n");
     78   return 0;
     79 }
     80 
     81 
     82 #define ROC_VERBOSE 0
     83 
     84 err_status_t
     85 roc_test(int num_trials) {
     86   xtd_seq_num_t local, est, ref;
     87   ut_connection utc;
     88   int i, num_bad_est = 0;
     89   int delta;
     90   uint32_t ircvd;
     91   double failure_rate;
     92 
     93   index_init(&local);
     94   index_init(&ref);
     95   index_init(&est);
     96 
     97   printf("\n\ttesting sequential insertion...");
     98   for (i=0; i < 2048; i++) {
     99     delta = index_guess(&local, &est, (uint16_t) ref);
    100 #if ROC_VERBOSE
    101     printf("%lld, %lld, %d\n", ref, est,  i);
    102 #endif
    103     if (ref != est) {
    104 #if ROC_VERBOSE
    105       printf(" *bad estimate*\n");
    106 #endif
    107       ++num_bad_est;
    108     }
    109     index_advance(&ref, 1);
    110   }
    111   failure_rate = (double) num_bad_est / num_trials;
    112   if (failure_rate > 0.01) {
    113     printf("error: failure rate too high (%d bad estimates in %d trials)\n",
    114 	   num_bad_est, num_trials);
    115     return err_status_algo_fail;
    116   }
    117   printf("done\n");
    118 
    119 
    120   printf("\ttesting non-sequential insertion...");
    121   index_init(&local);
    122   index_init(&ref);
    123   index_init(&est);
    124   ut_init(&utc);
    125 
    126   for (i=0; i < num_trials; i++) {
    127 
    128     /* get next seq num from unreliable transport simulator */
    129     ircvd = ut_next_index(&utc);
    130 
    131     /* set ref to value of ircvd */
    132     ref = ircvd;
    133 
    134     /* estimate index based on low bits of ircvd */
    135     delta = index_guess(&local, &est, (uint16_t) ref);
    136 #if ROC_VERBOSE
    137     printf("ref: %lld, local: %lld, est: %lld, ircvd: %d, delta: %d\n",
    138 	   ref, local, est, ircvd, delta);
    139 #endif
    140 
    141     /* now update local xtd_seq_num_t as necessary */
    142     if (delta > 0)
    143       index_advance(&local, delta);
    144 
    145     if (ref != est) {
    146 #if ROC_VERBOSE
    147       printf(" *bad estimate*\n");
    148 #endif
    149       /* record failure event */
    150       ++num_bad_est;
    151 
    152       /* reset local value to correct value */
    153       local = ref;
    154     }
    155   }
    156   failure_rate = (double) num_bad_est / num_trials;
    157   if (failure_rate > 0.01) {
    158     printf("error: failure rate too high (%d bad estimates in %d trials)\n",
    159 	   num_bad_est, num_trials);
    160     return err_status_algo_fail;
    161   }
    162   printf("done\n");
    163 
    164   return err_status_ok;
    165 }
    166