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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <config.h>
#include <isc/commandline.h>
#include <isc/print.h>
#include <isc/stdlib.h>
#include <isc/util.h>
#include <stdio.h>
#include <string.h>
const char *program = "genrandom";
ISC_PLATFORM_NORETURN_PRE static void
usage(void) ISC_PLATFORM_NORETURN_POST;
static void
usage(void) {
fprintf(stderr, "usage: %s [-n 2..9] k file\n", program);
exit(1);
}
static void
generate(char *filename, unsigned int bytes) {
FILE *fp;
fp = fopen(filename, "w");
if (fp == NULL) {
printf("failed to open %s\n", filename);
exit(1);
}
while (bytes > 0) {
#ifndef HAVE_ARC4RANDOM
unsigned short int x = (rand() & 0xFFFF);
#else
unsigned short int x = (arc4random() & 0xFFFF);
#endif
unsigned char c = x & 0xFF;
if (putc(c, fp) == EOF) {
printf("error writing to %s\n", filename);
exit(1);
}
c = x >> 8;
if (putc(c, fp) == EOF) {
printf("error writing to %s\n", filename);
exit(1);
}
bytes -= 2;
}
fclose(fp);
}
int
main(int argc, char **argv) {
unsigned int bytes;
unsigned int k;
char *endp;
int c, i, n = 1;
size_t len;
char *name;
isc_commandline_errprint = false;
while ((c = isc_commandline_parse(argc, argv, "hn:")) != EOF) {
switch (c) {
case 'n':
n = strtol(isc_commandline_argument, &endp, 10);
if ((*endp != 0) || (n <= 1) || (n > 9))
usage();
break;
case '?':
if (isc_commandline_option != '?')
fprintf(stderr, "%s: invalid argument -%c\n",
program, isc_commandline_option);
/* FALLTHROUGH */
case 'h':
usage();
default:
fprintf(stderr, "%s: unhandled option -%c\n",
program, isc_commandline_option);
exit(1);
}
}
if (isc_commandline_index + 2 != argc)
usage();
k = strtoul(argv[isc_commandline_index++], &endp, 10);
if (*endp != 0)
usage();
bytes = k << 10;
#ifndef HAVE_ARC4RANDOM
srand(0x12345678);
#endif
if (n == 1) {
generate(argv[isc_commandline_index], bytes);
return (0);
}
len = strlen(argv[isc_commandline_index]);
INSIST((len + 2) > len);
len += 2;
name = (char *) malloc(len);
if (name == NULL) {
perror("malloc");
exit(1);
}
for (i = 1; i <= n; i++) {
snprintf(name, len, "%s%d", argv[isc_commandline_index], i);
generate(name, bytes);
}
free(name);
return (0);
}
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