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/*
* Copyright (c) 2026, Chloe M., et al.
* Provided under the BSD-3 clause.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <fcntl.h>
#include <assert.h>
#include <unistd.h>
static const char chrtab[] = {
"ab123cde987654321=0fghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWZYZ"
"!@#$%^&*()[]><?"
};
static void
help(void)
{
printf("usage: ./newpass [flags]\n");
printf("[-h] Display this help menu\n");
printf("[-l] Length of password to create\n");
printf("[-c] Number of passwords to generate\n");
}
static void *
xmalloc(size_t sz)
{
void *buf;
#ifdef __OpenBSD__
buf = malloc_conceal(sz);
#else
buf = malloc(sz);
#endif
assert(buf != NULL && "allocation failure");
return buf;
}
static uint8_t *
randbytes(size_t count)
{
int fd;
uint8_t *buf;
ssize_t nbyte;
buf = xmalloc(count);
fd = open("/dev/urandom", O_RDONLY);
if (fd < 0) {
perror("open");
free(buf);
return NULL;
}
if ((nbyte = read(fd, buf, count)) < 0) {
perror("read");
free(buf);
close(fd);
return NULL;
}
return buf;
}
static void
genpass(size_t passlen)
{
uint8_t ind, *bytes;
size_t i;
if ((bytes = randbytes(passlen)) == NULL) {
printf("fatal: unable to generate random bytes\n");
return;
}
for (i = 0; i < passlen; ++i) {
ind = bytes[i] % sizeof(chrtab);
printf("%c", chrtab[ind]);
}
printf("\n");
free(bytes);
}
int
main(int argc, char **argv)
{
int opt;
size_t passlen = 0;
size_t i, passcount = 0;
while ((opt = getopt(argc, argv, "hl:c:")) != -1) {
switch (opt) {
case 'h':
help();
return -1;
case 'l':
if ((passlen = atoi(optarg)) == 0) {
printf("fatal: bad length given\n");
return -1;
}
break;
case 'c':
if ((passcount = atoi(optarg)) == 0) {
printf("fatal: bad count given\n");
return -1;
}
break;
}
}
if (passcount == 0) {
++passcount;
}
if (passlen == 0) {
printf("fatal: please specify a length with '-l'\n");
help();
return -1;
}
for (i = 0; i < passcount; ++i) {
genpass(passlen);
}
return 0;
}
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