apg-go/apg.go
Winni Neessen eaf4a4c57d
v0.3.1: New password length behaviour
To address issue #13, the password length behaviour of the
original APG has been reproduced. Previously, when a minLength
of 5 and a maxLength of 10 was given, apg-go se the pwLength to
the preferred maxLength.

With v0.3.1 it will choose a random length between minLength and
maxLength instead, same as the original C-lang apg did. For this
the minLength has been defaulted to a sane value of 12 (instead
of the 8 of the original apg). The default for maxLength stayed
at 20.

Also the default number of generated passwords has been changed
from 1 to 6, to replicate the behaviour of the original apg.
2021-04-17 11:11:54 +02:00

100 lines
2.9 KiB
Go

package main
import (
"flag"
"fmt"
"log"
"os"
)
// Constants
const DefaultMinLenght int = 12
const DefaultMaxLenght int = 20
const VersionString string = "0.3.1"
type Config struct {
minPassLen int
maxPassLen int
numOfPass int
useComplex bool
useLowerCase bool
useUpperCase bool
useNumber bool
useSpecial bool
humanReadable bool
excludeChars string
newStyleModes string
spellPassword bool
ShowHelp bool
showVersion bool
outputMode int
}
// Help text
const usage = `apg-go // A "Automated Password Generator"-clone
Copyright (c) 2021 Winni Neessen
apg [-m <length>] [-x <length>] [-L] [-U] [-N] [-S] [-H] [-C]
[-l] [-M mode] [-E char_string] [-n num_of_pass] [-v] [-h]
Options:
-m LENGTH Minimum length of the password to be generated (Default: 12)
-x LENGTH Maximum length of the password to be generated (Default: 20)
-n NUMBER Amount of password to be generated (Default: 6)
-E CHARS List of characters to be excluded in the generated password
-M [LUNSHClunshc] New style password parameters (upper case: on, lower case: off)
-L Use lower case characters in passwords (Default: on)
-U Use upper case characters in passwords (Default: on)
-N Use numeric characters in passwords (Default: on)
-S Use special characters in passwords (Default: on)
-H Avoid ambiguous characters in passwords (i. e.: 1, l, I, O, 0) (Default: off)
-C Enable complex password mode (implies -L -U -N -S and disables -H) (Default: off)
-l Spell generated passwords in phonetic alphabet (Default: off)
-h Show this help text
-v Show version string`
// Main function that generated the passwords and returns them
func main() {
// Log config
log.SetFlags(log.Ltime | log.Ldate | log.Lshortfile)
// Read and parse flags
flag.Usage = func() { _, _ = fmt.Fprintf(os.Stderr, "%s\n", usage) }
var config = parseFlags()
// Show version and exit
if config.showVersion {
_, _ = os.Stderr.WriteString(`apg-go // A "Automated Password Generator"-clone v` + VersionString + "\n")
_, _ = os.Stderr.WriteString("(C) 2021 by Winni Neessen\n")
os.Exit(0)
}
// Set PW length and available characterset
charRange := getCharRange(&config)
// Generate passwords
for i := 1; i <= config.numOfPass; i++ {
pwLength := getPwLengthFromParams(&config)
pwString, err := getRandChar(&charRange, pwLength)
if err != nil {
log.Fatalf("getRandChar returned an error: %q\n", err)
}
switch config.outputMode {
case 1:
{
spelledPw, err := spellPasswordString(pwString)
if err != nil {
log.Fatalf("spellPasswordString returned an error: %q\n", err.Error())
}
fmt.Printf("%v (%v)\n", pwString, spelledPw)
break
}
default:
{
fmt.Println(pwString)
break
}
}
}
}