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3 changed files with 306 additions and 1 deletions
17
Makefile
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17
Makefile
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all: passgen
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WARNINGS = -Wall
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DEBUG = -ggdb -fno-omit-frame-pointer
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OPTIMIZE = -O2
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passgen: Makefile passgen.c
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$(CC) -o $@ $(WARNINGS) $(DEBUG) $(OPTIMIZE) passgen.c
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clean:
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rm -f passgen
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install:
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echo "Installing is not supported"
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run:
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./passgen
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101
README.md
101
README.md
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# passgen
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# passgen
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A simple and efficient command line password generator written in C
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## Table of Contents
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- [Introduction](#introduction)
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- [Building](#building)
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- [Usage](#usage)
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- [Options](#options)
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- [Examples](#examples)
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## Introduction
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**passgen** is a password generation tool that allows you to create secure and
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customizable passwords. It generates passwords based on user-specified
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criteria, including password length and character types (lowercase letters,
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uppercase letters, digits, and special characters). You can also use
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**passgen** without any options to generate a random password with default
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settings.
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## Building
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This tool is provided as source code and can be built using `make`. By just
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typing make in the terminal within the code's directory:
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```bash
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make
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```
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You should now have an executable named `passgen`. You can copy it to a location
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in your PATH for easy access.
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## Usage
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To use passgen, open your terminal and execute the program with the desired
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options.
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```bash
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passgen [OPTIONS]
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```
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## Options
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**passgen** provides the following command-line options:
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- `-L`, `--length`:
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- Specify the length of the generated password. Default is 24 characters.
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- Valid range: 5 to 4096 characters.
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- `-l`, `--lower-case`:
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- Enable lowercase letters in the password.
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- `-u`, `--upper-case`:
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- Enable uppercase letters in the password.
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- `-d`, `--digits`:
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- Enable digits in the password.
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- `-s`, `--special`:
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- Enable special characters in the password.
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- `-h`, `--help`:
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- Display the help message and exit.
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- `-v`, `--version`:
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- Display the program version and exit.
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## Examples
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1. Generate a default password:
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```bash
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passgen
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```
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This will generate a 24-character password with a mix of lowercase letters,
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uppercase letters, digits, and special characters.
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2. Generate a password with specific options:
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```bash
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passgen -L 12 -lud
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```
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This will generate a 12-character password with only lowercase letters,
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uppercase letters, digits, and no special characters.
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3. Display help message:
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```bash
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passgen -h
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```
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This will display the usage and available options.
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4. Display version:
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```bash
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passgen -v
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```
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This will display the version of Passgen.
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189
passgen.c
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189
passgen.c
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/*
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* passgen.c
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*
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* Copyright 2024 Clay Gomera
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* SPDX-License-Identifier: GPL-3.0-only
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <stdbool.h>
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#include <string.h>
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#include <time.h>
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#define VERSION 0.1
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#define NAME "passgen"
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// Function prototypes
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char* generatePassword(unsigned int length, bool wantsUpCase, bool wantsLowCase, bool wantsDigits, bool wantsSpecials);
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void displayHelp();
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void displayVersion();
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int main(int argc, char **argv) {
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int option;
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unsigned int length = 24;
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bool wantsUpCase = false,
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wantsLowCase = false,
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wantsDigits = false,
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wantsSpecials = false;
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// Generate a random password if no arguments are given
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if (argc == 1) {
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char* password = generatePassword(length, true, true, true, true);
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printf("Password: %s\n", password);
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return 0;
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}
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// Options
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static const char* short_options = "L:ludshv";
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static struct option long_options[] = {
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{"length", required_argument, 0, 'L'},
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{"lower-case", no_argument, 0, 'l'},
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{"upper-case", no_argument, 0, 'u'},
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{"digits", no_argument, 0, 'd'},
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{"special", no_argument, 0, 's'},
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{"help", no_argument, 0, 'h'},
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{"version", no_argument, 0, 'v'},
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{NULL, 0, NULL, 0}
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};
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while ((option = getopt_long(argc, argv, short_options, long_options, NULL)) != -1) {
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switch (option) {
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case 'L':
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if ((length = atoi(optarg)) != 0) {
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if (length > 4096 || length < 5) {
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fprintf(stderr, "Error: The password length can't be greater than 4096 or less than 5 characters.\n\n");
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displayHelp();
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return 1;
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}
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}
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else {
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fprintf(stderr, "Invalid value provided. Please provide a valid numeric value for the length.\n\n");
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displayHelp();
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return 1;
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}
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break;
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case 'l':
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wantsLowCase = true;
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break;
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case 'u':
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wantsUpCase = true;
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break;
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case 'd':
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wantsDigits = true;
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break;
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case 's':
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wantsSpecials = true;
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break;
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case 'h':
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displayHelp();
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return 0;
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case 'v':
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displayVersion();
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return 0;
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case '?':
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fprintf(stderr, "Use '-h, --help' for help.\n");
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return 1;
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}
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}
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if (!wantsLowCase && !wantsUpCase && !wantsDigits && !wantsSpecials) {
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char* password = generatePassword(length, true, true, true, true);
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printf("Password: %s\n", password);
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return 0;
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}
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char* password = generatePassword(length, wantsUpCase, wantsLowCase, wantsDigits, wantsSpecials);
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printf("Password: %s\n", password);
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return 0;
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}
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char* generatePassword(unsigned int length, bool wantsUpCase, bool wantsLowCase, bool wantsDigits, bool wantsSpecials) {
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const char* uppercase_letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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const char* lowercase_letters = "abcdefghijklmnopqrstuvwxyz";
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const char* digits = "0123456789";
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const char* special_chars = "!@#$%^&*()_=[{]}\\|;:'\",<.>?`~+-/*";
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// Seed the random number generator with processor time
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srand((unsigned int)clock());
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// Calculate the total number of characters based on user preferences
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unsigned int total_chars = 0;
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if (wantsUpCase) total_chars += strlen(uppercase_letters);
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if (wantsLowCase) total_chars += strlen(lowercase_letters);
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if (wantsDigits) total_chars += strlen(digits);
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if (wantsSpecials) total_chars += strlen(special_chars);
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char* password = (char*)malloc((length + 1) * sizeof(char)); // +1 for null-terminator
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if (password == NULL) {
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fprintf(stderr, "Memory allocation error.\n");
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exit(1);
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}
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for (unsigned int i = 0; i < length; i++) {
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int random_index = rand() % total_chars;
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if (wantsUpCase) {
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if (random_index < strlen(uppercase_letters)) {
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password[i] = uppercase_letters[random_index];
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continue;
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}
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random_index -= strlen(uppercase_letters);
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}
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if (wantsLowCase) {
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if (random_index < strlen(lowercase_letters)) {
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password[i] = lowercase_letters[random_index];
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continue;
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}
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random_index -= strlen(lowercase_letters);
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}
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if (wantsDigits) {
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if (random_index < strlen(digits)) {
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password[i] = digits[random_index];
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continue;
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}
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random_index -= strlen(digits);
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}
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if (wantsSpecials) {
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password[i] = special_chars[random_index];
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}
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}
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password[length] = '\0'; // Null-terminate the string
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return password;
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}
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// Function to display the help message
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void displayHelp() {
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printf("Usage: %s [OPTIONS]\n", NAME);
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printf("Generate passwords with ease.\n\n");
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printf("Options:\n");
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printf("\t-L, --length Specify the length of the password.\n");
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printf("\t-l, --lower-case Enable lowercase for the password.\n");
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printf("\t-u, --upper-case Enable uppercase for the password.\n");
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printf("\t-d, --digits Enable digits for the password.\n");
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printf("\t-s, --special Enable special characters for the password.\n");
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printf("\t-h, --help Display this help message and exit.\n");
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printf("\t-v, --version Display version and exit.\n");
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}
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// Function to display the version information
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void displayVersion() {
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printf("%s v%.1f\n", NAME, VERSION);
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}
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