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/* generates random data for later use in test cases. Of course,
* we could generate random data during the testcase itself, but
* the core idea is that we record the random data so that we have
* a chance to reproduce a problem should it occur. IMHO this
* provides the best compromise, by a) having randomness but
* b) knowing what was used during the test.
*
* Params
* -f output file name (stdout if not given)
* -s size of test data, plain number is size in k, 1MB default
* -u uses /dev/urandom instead of libc random number generator
* (when available). Note that this is usually much slower.
*
* Part of the testbench for rsyslog.
*
* Copyright 2010 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Rsyslog 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 3 of the License, or
* (at your option) any later version.
*
* Rsyslog 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 Rsyslog. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <assert.h>
#include <unistd.h>
#include <string.h>
#include <netinet/in.h>
#define EXIT_FAILURE 1
static char *fileName = NULL; /* name of output file */
static int tryUseURandom = 0; /* try to use /dev/urandom? */
static long long fileSize = 1024*1024; /* file size in K, 1MB default */
/* generate the random file. This code really can be improved (e.g. read /dev/urandom
* when available)
*/
static inline void
genFile()
{
long i;
FILE *fp;
FILE *rfp = NULL;
if(fileName == NULL) {
fp = stdout;
} else {
if((fp = fopen(fileName, "w")) == NULL) {
perror(fileName);
}
}
/* try to use /dev/urandom, if available */
if(tryUseURandom)
rfp = fopen("/dev/urandom", "r");
if(rfp == NULL) {
/* fallback, use libc random number generator */
for(i = 0 ; i < fileSize ; ++i) {
if(fputc((char) rand(), fp) == EOF) {
perror(fileName);
exit(1);
}
}
} else {
/* use /dev/urandom */
printf("using /dev/urandom");
for(i = 0 ; i < fileSize ; ++i) {
if(fputc(fgetc(rfp), fp) == EOF) {
perror(fileName);
exit(1);
}
}
}
if(fileName != NULL)
fclose(fp);
}
/* Run the test.
* rgerhards, 2009-04-03
*/
int main(int argc, char *argv[])
{
int ret = 0;
int opt;
srand(time(NULL)); /* seed is good enough for our needs */
while((opt = getopt(argc, argv, "f:s:u")) != -1) {
switch (opt) {
case 'f': fileName = optarg;
break;
case 's': fileSize = atol(optarg) * 1024;
break;
case 'u': tryUseURandom = 1;
break;
default: printf("invalid option '%c' or value missing - terminating...\n", opt);
exit (1);
break;
}
}
printf("generating random data file '%s' of %ldkb - may take a short while...\n",
fileName, (long) (fileSize / 1024));
genFile();
exit(ret);
}
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