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/*
* pw_rand.c --- generate completely random (and hard to remember)
* passwords
*
* Copyright (C) 2001,2002 by Theodore Ts'o
*
* This file may be distributed under the terms of the GNU Public
* License.
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "pwgen.h"
const char *pw_digits = "0123456789";
const char *pw_uppers = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const char *pw_lowers = "abcdefghijklmnopqrstuvwxyz";
const char *pw_symbols = "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~";
const char *pw_ambiguous = "B8G6I1l0OQDS5Z2";
const char *pw_vowels = "01aeiouyAEIOUY";
static void remove_chars(char *buf, const char *remove)
{
const char *cp;
if (!remove)
return;
for (cp = remove; *cp; cp++) {
char *r = strchr(buf, *cp);
if (r == NULL)
continue;
memmove(r, r+1, strlen(r));
}
}
static int find_chars(char *buf, const char *set)
{
const char *cp;
for (cp = set; *cp; cp++)
if (strchr(buf, *cp))
return 1;
return 0;
}
void pw_rand(char *buf, int size, int pw_flags, char *remove)
{
char ch, *chars, *wchars;
int i, len, feature_flags;
len = 0;
if (pw_flags & PW_DIGITS) {
len += strlen(pw_digits);
}
if (pw_flags & PW_UPPERS) {
len += strlen(pw_uppers);
}
len += strlen(pw_lowers);
if (pw_flags & PW_SYMBOLS) {
len += strlen(pw_symbols);
}
chars = malloc(len+1);
if (!chars) {
fprintf(stderr, "Couldn't malloc pw_rand buffer.\n");
exit(1);
}
wchars = chars;
if (pw_flags & PW_DIGITS) {
strcpy(wchars, pw_digits);
wchars += strlen(pw_digits);
}
if (pw_flags & PW_UPPERS) {
strcpy(wchars, pw_uppers);
wchars += strlen(pw_uppers);
}
strcpy(wchars, pw_lowers);
wchars += strlen(pw_lowers);
if (pw_flags & PW_SYMBOLS) {
strcpy(wchars, pw_symbols);
}
if (remove) {
if (pw_flags & PW_AMBIGUOUS)
remove_chars(chars, pw_ambiguous);
if (pw_flags & PW_NO_VOWELS)
remove_chars(chars, pw_vowels);
remove_chars(chars, remove);
if ((pw_flags & PW_DIGITS) &&
!find_chars(chars, pw_digits)) {
fprintf(stderr,
"Error: No digits left in the valid set\n");
exit(1);
}
if ((pw_flags & PW_UPPERS) &&
!find_chars(chars, pw_uppers)) {
fprintf(stderr,
"Error: No upper case letters left in "
"the valid set\n");
exit(1);
}
if ((pw_flags & PW_SYMBOLS) &&
!find_chars(chars, pw_symbols)) {
fprintf(stderr,
"Error: No symbols left in the valid set\n");
exit(1);
}
if (chars[0] == '\0') {
fprintf(stderr,
"Error: No characters left in the valid set\n");
exit(1);
}
}
len = strlen(chars);
try_again:
feature_flags = (size > 2) ? pw_flags : 0;
i = 0;
while (i < size) {
ch = chars[pw_number(len)];
if ((pw_flags & PW_AMBIGUOUS) && strchr(pw_ambiguous,ch))
continue;
if ((pw_flags & PW_NO_VOWELS) && strchr(pw_vowels, ch))
continue;
buf[i++] = ch;
if ((feature_flags & PW_DIGITS) &&
strchr(pw_digits, ch))
feature_flags &= ~PW_DIGITS;
if ((feature_flags & PW_UPPERS) &&
strchr(pw_uppers, ch))
feature_flags &= ~PW_UPPERS;
if ((feature_flags & PW_SYMBOLS) &&
strchr(pw_symbols, ch))
feature_flags &= ~PW_SYMBOLS;
}
if (feature_flags & (PW_UPPERS | PW_DIGITS | PW_SYMBOLS))
goto try_again;
buf[size] = 0;
free(chars);
return;
}
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