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/* pwgen.c - A password generator.
*
* Copyright 2020 Moritz R�hrich <moritz@ildefons.de>
USE_PWGEN(NEWTOY(pwgen, ">2r(remove):c(capitalize)n(numerals)y(symbols)s(secure)B(ambiguous)h(help)C1vA(no-capitalize)0(no-numerals)[-cA][-n0][-C1]", TOYFLAG_USR|TOYFLAG_BIN))
config PWGEN
bool "pwgen"
default y
help
usage: pwgen [-cAn0yrsBhC1v] [LENGTH] [COUNT]
Generate human-readable random passwords. When output is to tty produces
a screenfull to defeat shoulder surfing (pick one and clear the screen).
-c --capitalize Permit capital letters.
-A --no-capitalize Don't include capital letters.
-n --numerals Permit numbers.
-0 --no-numerals Don't include numbers.
-y --symbols Permit special characters ($#%...).
-r <chars> --remove=<chars> Don't include the given characters.
-s --secure Generate more random passwords.
-B --ambiguous Avoid ambiguous characters (e.g. 0, O).
-h --help Print this help message.
-C Print the output in columns.
-1 Print the output one line each.
-v Don't include vowels.
*/
#define FOR_pwgen
#include "toys.h"
GLOBALS(
char *r;
)
void pwgen_main(void)
{
int length = 8, count, ii, jj, c, rand = 0, x = 0;
unsigned xx = 80, yy = 24;
char randbuf[16];
if (isatty(1)) terminal_size(&xx, &yy);
else toys.optflags |= FLAG_1;
if (toys.optc && (length = atolx(*toys.optargs))>sizeof(toybuf))
error_exit("bad length");
if (toys.optc>1) count = atolx(toys.optargs[1]);
else count = FLAG(1) ? 1 : (xx/(length+1))*(yy-1);
for (jj = 0; jj<count; jj++) {
for (ii = 0; ii<length;) {
// Don't fetch more random than necessary, give each byte 2 tries to fit
if (!rand) xgetrandom(randbuf, rand = sizeof(randbuf), 0);
c = 33+randbuf[--rand]%93; // remainder 69 makes >102 less likely
if (FLAG(s)) randbuf[rand] = 0;
if (c>='A' && c<='Z') {
if (FLAG(A)) continue;
// take out half the capital letters to be more human readable
else c |= (0x80&randbuf[rand])>>2;
}
if (FLAG(0) && c>='0' && c<='9') continue;
if (FLAG(B) && strchr("0O1lI'`.,", c)) continue;
if (FLAG(v) && strchr("aeiou", tolower(c))) continue;
if (!FLAG(y) || (0x80&randbuf[rand]))
if (c<'0' || (c>'9' && c<'A') || (c>'Z' && c<'a') || c>'z') continue;
if (TT.r && strchr(TT.r, c)) continue;
toybuf[ii++] = c;
}
if (FLAG(1) || (x += length+1)+length>=xx) x = 0;
xprintf("%.*s%c", length, toybuf, x ? ' ' : '\n');
}
if (x) xputc('\n');
}
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