Dear Mr. Landley,
I have implemented `pwgen`, a small password generation utility for toybox.
This utility is useful, not only for passwords but also for generating
random strings in general.
Hopefully the code meets quality expectations, but I'd be more than happy to
take criticism.
Best regards, Moritz
>From d3439c5f1c92116c5eb0711a8e22abbf04501eb6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Moritz=20R=C3=B6hrich?= <mor...@ildefons.de>
Date: Sat, 5 Dec 2020 14:12:16 +0100
Subject: [PATCH] new toy: Add pwgen
Add new toy `pwgen`.
A usefule password generation utility.
---
toys/pending/pwgen.c | 130 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 130 insertions(+)
create mode 100644 toys/pending/pwgen.c
diff --git a/toys/pending/pwgen.c b/toys/pending/pwgen.c
new file mode 100644
index 00000000..bbd89f4c
--- /dev/null
+++ b/toys/pending/pwgen.c
@@ -0,0 +1,130 @@
+/* pwgen.c - A password generator.
+ *
+ * Copyright 2020 Moritz Röhrich <mor...@ildefons.de>
+
+USE_PWGEN(NEWTOY(pwgen, ">2?r(remove):c(capitalize)n(numerals)y(symbols)s(secure)B(ambiguous)h(help)C1vA(no-capitalize)0(no-numerals)[-cA][-n0]", TOYFLAG_USR|TOYFLAG_BIN))
+
+config PWGEN
+ bool "pwgen"
+ default n
+ help
+ usage: pwgen [ OPTIONS ] [ length ] [ number ]
+
+ A password generator.
+
+ Options supported by pwgen:
+ -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 ($#%...).
+ -r <chars> --remove=<chars> Don't include the given characters.
+ -s --secure Generate more random passwords.
+ -B --ambiguous Avoid ambiguous characters (e.g. 0, O).
+ -h --help Print this help message.
+ -C Print the output in columns.
+ -1 Print the output one line each.
+ -v Don't include vowels.
+*/
+
+#define FOR_pwgen
+#include "toys.h"
+
+GLOBALS(
+ char *r;
+)
+
+// Generate one random printable/typeable ascii character.
+char get_rand_chr() {
+ return (char) (33 + (rand() % 93));
+}
+
+// Uses get_rand_chr to generate a character that conforms the requirements set
+// by the argument flags.
+char get_valid_chr(const char *illegal) {
+ char c = get_rand_chr();
+
+ while (strchr(illegal, c) != NULL)
+ c = get_rand_chr();
+
+ return c;
+}
+
+char * get_illegal_chars() {
+ char* illegal = malloc(94 * sizeof(char));
+ memset(illegal, 0, 94 * sizeof(char));
+ if (toys.optflags & FLAG(A))
+ strcat(illegal, "ABCDEFGHIJKLMNOPQRSTUVWXYZ");
+ if (toys.optflags & FLAG(0))
+ strcat(illegal, "1234567890");
+ if (toys.optflags & FLAG(B))
+ strcat(illegal, "0O1lI'`.,");
+ if (toys.optflags & FLAG(v))
+ strcat(illegal, "ieaouIEAOU");
+ if (!(toys.optflags & FLAG(y)))
+ strcat(illegal, "!@#$%^&*()-_=+`~{}[];:'\",.<>/?\\|");
+ if (TT.r){
+ strcat(illegal, TT.r);
+ }
+ return illegal;
+}
+
+// Generate a new password of length l.
+char * get_pw(const unsigned long l, const char *illegal) {
+ char *pw = malloc((l+1) * sizeof(char));
+ memset(pw, 0, (l+1) * sizeof(char)); // zero out memory for new password.
+ unsigned long i;
+ for (i = 0; i < l; i++){
+ pw[i] = get_valid_chr(illegal);
+ }
+
+ return pw;
+}
+
+void pwgen_main(void)
+{
+ // seed the (pseudo) RNG.
+ time_t t;
+ srand((unsigned) time(&t));
+
+ int length = 8;
+ int count = 160;
+ int num_columns = 8;
+ if (toys.optc > 0) {
+ length = atoi(toys.optargs[0]);
+ num_columns = 80 / (length+1);
+ if (toys.optc > 1) {
+ count = atoi(toys.optargs[1]);
+ } else if (toys.optflags & FLAG(1)) {
+ count = 1;
+ } else {
+ count = 20 * num_columns;
+ }
+ }
+
+ char *illegal = get_illegal_chars();
+ char **passwords = malloc(count * sizeof(char*));
+ int c;
+ for (c = 0; c < count; c++)
+ passwords[c] = get_pw(length, illegal);
+
+ if (toys.optflags & FLAG(1)){
+ for (c = 0; c < count; c++)
+ xprintf("%s\n", passwords[c]);
+ } else {
+ int col;
+ c = 0;
+ while(c < count){
+ for (col = 0; c < count && col < num_columns; col++){
+ xprintf("%s ", passwords[c]);
+ c += 1;
+ }
+ xprintf("\n");
+ }
+ }
+
+ for (c = 0; c < count; c++)
+ free(passwords[c]);
+ free(passwords);
+ free(illegal);
+}
--
2.20.1
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