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/*
* pwgen.c --- generate secure passwords
*
* Copyright (C) 2001,2002 by Theodore Ts'o
*
* This file may be distributed under the terms of the GNU Public
* License.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include "pwgen.h"
/* Globals variables */
int (*pw_number)(int max_num);
/* Program parameters set via getopt */
int pw_length = 8;
int num_pw = -1;
int pwgen_flags = 0;
int do_columns = 0;
#ifdef HAVE_GETOPT_LONG
struct option pwgen_options[] = {
{ "alt-phonics", no_argument, 0, 'a' },
{ "capitalize", no_argument, 0, 'c' },
{ "numerals", no_argument, 0, 'n'},
{ "symbols", no_argument, 0, 'y'},
{ "num-passwords", required_argument, 0, 'N'},
{ "remove-chars", required_argument, 0, 'r' },
{ "secure", no_argument, 0, 's' },
{ "help", no_argument, 0, 'h'},
{ "no-numerals", no_argument, 0, '0' },
{ "no-capitalize", no_argument, 0, 'A' },
{ "sha1", required_argument, 0, 'H' },
{ "ambiguous", no_argument, 0, 'B' },
{ "no-vowels", no_argument, 0, 'v' },
{ 0, 0, 0, 0}
};
#endif
const char *pw_options = "01AaBCcnN:sr:hH:vy";
static void usage(void)
{
fputs("Usage: pwgen [ OPTIONS ] [ pw_length ] [ num_pw ]\n\n", stderr);
fputs("Options supported by pwgen:\n", stderr);
fputs(" -c or --capitalize\n", stderr);
fputs("\tInclude at least one capital letter in the password\n",
stderr);
fputs(" -A or --no-capitalize\n", stderr);
fputs("\tDon't include capital letters in the password\n",
stderr);
fputs(" -n or --numerals\n", stderr);
fputs("\tInclude at least one number in the password\n", stderr);
fputs(" -0 or --no-numerals\n", stderr);
fputs("\tDon't include numbers in the password\n",
stderr);
fputs(" -y or --symbols\n", stderr);
fputs("\tInclude at least one special symbol in the password\n",
stderr);
fputs(" -r <chars> or --remove-chars=<chars>\n", stderr);
fputs("\tRemove characters from the set of characters to "
"generate passwords\n", stderr);
fputs(" -s or --secure\n", stderr);
fputs("\tGenerate completely random passwords\n", stderr);
fputs(" -B or --ambiguous\n", stderr);
fputs("\tDon't include ambiguous characters in the password\n",
stderr);
fputs(" -h or --help\n", stderr);
fputs("\tPrint a help message\n", stderr);
fputs(" -H or --sha1=path/to/file[#seed]\n", stderr);
fputs("\tUse sha1 hash of given file as a (not so) random generator\n",
stderr);
fputs(" -C\n\tPrint the generated passwords in columns\n", stderr);
fputs(" -1\n\tDon't print the generated passwords in columns\n",
stderr);
fputs(" -v or --no-vowels\n", stderr);
fputs("\tDo not use any vowels so as to avoid accidental nasty words\n",
stderr);
exit(1);
}
int main(int argc, char **argv)
{
int term_width = 80;
int c, i;
int num_cols = -1;
char *buf, *tmp;
char *remove=NULL;
void (*pwgen)(char *inbuf, int size, int pw_flags, char *remove);
pwgen = pw_phonemes;
pw_number = pw_random_number;
if (isatty(1))
do_columns = 1;
pwgen_flags |= PW_DIGITS | PW_UPPERS;
while (1) {
#ifdef HAVE_GETOPT_LONG
c = getopt_long(argc, argv, pw_options, pwgen_options, 0);
#else
c = getopt(argc, argv, pw_options);
#endif
if (c == -1)
break;
switch (c) {
case '0':
pwgen_flags &= ~PW_DIGITS;
break;
case 'A':
pwgen_flags &= ~PW_UPPERS;
break;
case 'a':
break;
case 'B':
pwgen_flags |= PW_AMBIGUOUS;
break;
case 'c':
pwgen_flags |= PW_UPPERS;
break;
case 'n':
pwgen_flags |= PW_DIGITS;
break;
case 'N':
num_pw = strtol(optarg, &tmp, 0);
if (*tmp) {
fprintf(stderr,
"Invalid number of passwords: %s\n",
optarg);
exit(1);
}
break;
case 's':
pwgen = pw_rand;
break;
case 'C':
do_columns = 1;
break;
case '1':
do_columns = 0;
break;
case 'H':
pw_sha1_init(optarg);
pw_number = pw_sha1_number;
break;
case 'y':
pwgen_flags |= PW_SYMBOLS;
break;
case 'v':
pwgen = pw_rand;
pwgen_flags |= PW_NO_VOWELS;
break;
case 'r':
remove = strdup(optarg);
pwgen = pw_rand;
break;
case 'h':
case '?':
usage();
break;
}
}
if (optind < argc) {
pw_length = strtol(argv[optind], &tmp, 0);
if (pw_length < 5)
pwgen = pw_rand;
if (pwgen != pw_rand) {
if (pw_length <= 2)
pwgen_flags &= ~PW_UPPERS;
if (pw_length <= 1)
pwgen_flags &= ~PW_DIGITS;
}
if (*tmp) {
fprintf(stderr, "Invalid password length: %s\n",
argv[optind]);
exit(1);
}
optind++;
}
if (optind < argc) {
num_pw = strtol(argv[optind], &tmp, 0);
if (*tmp) {
fprintf(stderr, "Invalid number of passwords: %s\n",
argv[optind]);
exit(1);
}
}
if (do_columns) {
num_cols = term_width / (pw_length+1);
if (num_cols == 0)
num_cols = 1;
}
if (num_pw < 0)
num_pw = do_columns ? num_cols * 20 : 1;
buf = malloc(pw_length+1);
if (!buf) {
fprintf(stderr, "Couldn't malloc password buffer.\n");
exit(1);
}
for (i=0; i < num_pw; i++) {
pwgen(buf, pw_length, pwgen_flags, remove);
if (!do_columns || ((i % num_cols) == (num_cols-1)) ||
(i == (num_pw - 1)))
printf("%s\n", buf);
else
printf("%s ", buf);
}
free(buf);
return 0;
}
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