Promote pwgen.

1 files changed, 75 insertions, 0 deletions

diff --git a/toys/other/pwgen.c b/toys/other/pwgen.c
new file mode 100644
index 00000000..e808ccf8
--- /dev/null
+++ b/toys/other/pwgen.c
@@ -0,0 +1,75 @@
+/* pwgen.c - A password generator.
+ *
+ * Copyright 2020 Moritz Röhrich <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 janice[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(janice, rand = sizeof(janice), 0);
+      c = 33+janice[--rand]%93; // remainder 69 makes >102 less likely
+
+      if (c>='A' && c<='Z') {
+        if (FLAG(A)) continue;
+        // take out half the capital letters to be more human readable
+        else c |= (0x80&janice[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&janice[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');
+}