├── .gitignore ├── ORDER.txt ├── README.md ├── doc ├── 00.index.md ├── 01.aPasswordGenerator.md ├── 02.storingPlaintextPasswords.md ├── 03.encryption.md ├── 04.getopt.md ├── 05.multilineFiles.md ├── 06.git.md ├── 07.signingAndVerification.md ├── 08.multiplePasswordStores.md ├── 09.extensions.md ├── 10.bashCompletion.md └── html_in │ ├── fonts.css │ ├── fonts │ ├── fira-mono-v5-latin-500.eot │ ├── fira-mono-v5-latin-500.svg │ ├── fira-mono-v5-latin-500.ttf │ ├── fira-mono-v5-latin-500.woff │ ├── fira-mono-v5-latin-500.woff2 │ ├── fira-mono-v5-latin-regular.eot │ ├── fira-mono-v5-latin-regular.svg │ ├── fira-mono-v5-latin-regular.ttf │ ├── fira-mono-v5-latin-regular.woff │ ├── fira-mono-v5-latin-regular.woff2 │ ├── pt-serif-v8-latin-700.eot │ ├── pt-serif-v8-latin-700.svg │ ├── pt-serif-v8-latin-700.ttf │ ├── pt-serif-v8-latin-700.woff │ ├── pt-serif-v8-latin-700.woff2 │ ├── pt-serif-v8-latin-italic.eot │ ├── pt-serif-v8-latin-italic.svg │ ├── pt-serif-v8-latin-italic.ttf │ ├── pt-serif-v8-latin-italic.woff │ ├── pt-serif-v8-latin-italic.woff2 │ ├── pt-serif-v8-latin-regular.eot │ ├── pt-serif-v8-latin-regular.svg │ ├── pt-serif-v8-latin-regular.ttf │ ├── pt-serif-v8-latin-regular.woff │ ├── pt-serif-v8-latin-regular.woff2 │ ├── work-sans-v2-latin-700.eot │ ├── work-sans-v2-latin-700.svg │ ├── work-sans-v2-latin-700.ttf │ ├── work-sans-v2-latin-700.woff │ └── work-sans-v2-latin-700.woff2 │ ├── i │ ├── arrow.png │ └── x.png │ ├── style.css │ ├── template.html │ └── template_index.html ├── leg.yml ├── steps.diff └── steps.diff.LICENSE /.gitignore: -------------------------------------------------------------------------------- 1 | ftp.yml 2 | .cached-diffs 3 | steps/ 4 | repo/ 5 | doc/html_out/ 6 | doc/html_offline/ 7 | *.zip 8 | -------------------------------------------------------------------------------- /ORDER.txt: -------------------------------------------------------------------------------- 1 | ***PASSWORD GENERATOR*** 2 | cmd_generate() 3 | cmd_version() 4 | cmd_usage() 5 | die() 6 | 7 | ***PERSIST TO DISK*** 8 | cmd_generate() persists to disk 9 | yesno() 10 | check_sneaky_paths() 11 | cmd_show() (with ls) 12 | cmd_find() 13 | cmd_delete() 14 | 15 | ***ENCRYPTION*** 16 | cmd_init() 17 | set $GPG, $GPG_OPTS, etc. 18 | set_gpg_recipients() 19 | encrypt in cmd_generate() 20 | decrypt in cmd_show() 21 | 22 | ***GETOPT*** 23 | clip() 24 | getopt 25 | qrcode() 26 | cmd_generate() options 27 | cmd_delete() options 28 | 29 | ***MULTILINE FILES*** 30 | cmd_insert() 31 | cmd_edit() 32 | tmpdir() 33 | -c,-q with line number 34 | -i option to cmd_generate() 35 | cmd_copy_move() 36 | cmd_grep() 37 | 38 | ***GIT SUPPORT*** 39 | set_git() 40 | git_commit() 41 | git_add_file() 42 | cmd_git() 43 | git support for all commands 44 | 45 | ***SIGNING & VERIFICATION*** 46 | verify_file() 47 | sign file in cmd_init() 48 | sign git commits 49 | 50 | ***MULTIPLE PASSWORD STORES*** 51 | multiple .gpg-id files 52 | git support for cmd_init() 53 | reencrypt_path() 54 | 55 | ***EXTENSION SUPPORT*** 56 | cmd_extension() 57 | pass-update extension 58 | 59 | ***COMPLETION*** 60 | shell completion 61 | 62 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Build Your Own Password Manager 2 | 3 | This is a (work-in-progress) tutorial that will teach you shell scripting by 4 | showing you how to build the [pass](https://www.passwordstore.org/) password 5 | manager in small steps. 6 | 7 | ## Assumptions 8 | 9 | * Basic shell knowledge (`cd`, `ls`) 10 | * Basic programming experience (variables, functions, conditionals, loops) 11 | * Basic understanding of `git` will help in the section where we add git 12 | support (not too important) 13 | 14 | ## The Plan 15 | 16 | 1. A password generator 17 | * Step 1: `echo "correcthorsebatterystaple"` 18 | * Generate a random string 19 | * The `generate` command 20 | * The `version` command 21 | * The `help` command 22 | 2. Storing plaintext passwords 23 | * Save generated password to `$PREFIX` 24 | * The `show` command 25 | * Make `show` the default command 26 | * The `insert` command 27 | * The `rm` command 28 | * The `mv` command 29 | * The `cp` command 30 | 3. Encryption 31 | * The `init` command 32 | * GPG options and whether to use `gpg2` 33 | * `gpg_winpath()` for Cygwin 34 | * `set_gpg_recipients()` 35 | * Encrypt with `generate` and `insert` commands 36 | * Decrypt with `show` command 37 | * Reencrypt using `init` command 38 | 4. Copy to clipboard 39 | * Generic `clip()` 40 | * Cygwin `clip()` 41 | * macOS `clip()` 42 | * `-c` option for `generate` and `show` commands 43 | * Clear clipboard after 45 seconds 44 | * Reset 45-second timer before starting a new one 45 | * Restore previous clipboard contents 46 | 5. Getopt 47 | * Find GNU getopt for the platform 48 | * Use it for `-c/--clip` switch 49 | * More switches 50 | 5. QR codes 51 | * Generic `qrcode()` 52 | * macOS `qrcode()` 53 | * `-q` option for `generate` and `show` commands 54 | 6. Secure text editing 55 | * The `edit` command 56 | * Generic `tmpdir()` 57 | * macOS `tmpdir()` 58 | * FreeBSD `$SHRED` 59 | * OpenBSD `tmpdir()` 60 | 7. Listing and searching 61 | * The `ls` command 62 | * The `find` command 63 | * The `grep` command 64 | 8. Git 65 | * The `git` command 66 | * `set_git()` 67 | * `git_add_file()` 68 | * `git_commit()` 69 | * Add git support to `generate` and `insert` commands 70 | * Add git support to `edit`, `rm`, `mv`, `cp` commands 71 | 9. Completion 72 | * `bash` completion 73 | * `zsh` completion 74 | * `fish` completion 75 | 10. Signing and verification 76 | * Sign `.gpg_id` in `init` command 77 | * `verify_file()` 78 | * Sign git commits 79 | 11. Multiple users 80 | * `--path` option for `init` command 81 | 12. User extensions 82 | * `cmd_extension()` 83 | * An example: `pass-update` 84 | 85 | -------------------------------------------------------------------------------- /doc/00.index.md: -------------------------------------------------------------------------------- 1 | # Build Your Own Password Manager 2 | 3 | Welcome! This is an instruction booklet that shows you how to build a password 4 | manager in shell script. 5 | 6 | The password manager is [pass](http://password-store.org). It's about 1000 7 | lines of shell script. 8 | 9 | If you're ready to begin, then go to [chapter 1](01.aPasswordGenerator.html)! 10 | 11 | ## Table of Contents 12 | 13 | {{toc}} 14 | 15 | -------------------------------------------------------------------------------- /doc/01.aPasswordGenerator.md: -------------------------------------------------------------------------------- 1 | # A password generator 2 | 3 | Create a file named `pass` and type the following code into it. 4 | 5 | {{correct-horse-battery-staple}} 6 | 7 | To run this program, you need to make it e**x**ecutable using the command 8 | `chmod +x pass`. Then you can run it by typing `./pass` and pressing 9 | Enter. 10 | 11 | It prints out a password when you run it. It prints out the same password every 12 | time, but we'll fix that soon enough. 13 | 14 | The first line (`#!/usr/bin/env bash`) is called a 15 | [shebang](https://en.wikipedia.org/wiki/Shebang_(Unix)) line. (`#` is a hash 16 | character, and `!` is a bang character, so together they form a hash-bang, or 17 | shebang for short.) The shebang line allows you to run scripts the same way you 18 | run binaries, so you can type `./pass` instead of `bash pass`. When the OS 19 | goes to execute a file that begins with `#!`, it runs the program that comes 20 | after the `#!` instead, and passes the file to that program as an argument. So 21 | if the `pass` script began with `#!/bin/bash`, it would be executed using 22 | `/bin/bash pass`. 23 | 24 | However, the `bash` program might not be located at `/bin/bash` on all systems. 25 | To make `pass` more portable, the `env` program is used. `env` is a program 26 | that runs the given command, optionally in a modified **env**ironment. It is 27 | used in shebang lines because it runs commands similar to how commands are run 28 | on the shell: it looks in your `$PATH` to locate the command you gave. So with 29 | a shebang line of `#!/usr/bin/env bash`, the `bash` command will be located 30 | properly, wherever it may be on your system. 31 | 32 | The reason you can't use something like `#!bash`, and expect it to use `$PATH` 33 | to find `bash` like a shell command would, is that shebang scripts are 34 | [handled by the OS](https://lwn.net/Articles/630727/) at a very 35 | [low level](http://lxr.free-electrons.com/source/fs/binfmt_script.c?v=3.18). 36 | 37 | `bash` stands for **B**ourne-**a**gain **sh**ell, which was written to replace 38 | the [Bourne shell](https://en.wikipedia.org/wiki/Bourne_shell) (`sh`). `bash` 39 | is very widely available, and is the default shell on most Unix systems. 40 | 41 | So that's line 1. 42 | 43 | Moving on to line 3, we have an `echo` command. `echo` is a 44 | program that just prints out the command line arguments it is given. We give it 45 | a quoted argument. The shell 46 | [removes the quotes](https://www.gnu.org/software/bash/manual/html_node/Quote-Removal.html) 47 | before passing the argument to `echo`, and `echo` prints the password to the 48 | standard output. 49 | 50 | ## Variables 51 | 52 | Let's try assigning the password to a variable, and printing out the variable. 53 | 54 | {{variable}} 55 | 56 | When the first word of a line contains an `=` character, it is interpreted as 57 | an assignment statement instead of a command. There must not be any whitespace 58 | around the `=`. If you wrote `pass = "correcthorsebatterystaple"`, then Bash 59 | would try to execute a program named `pass` and pass it the arguments `=` and 60 | `correcthorsebatterystaple`. 61 | 62 | Once again, the quotes around `"correcthorsebatterystaple"` are not necessary. 63 | The quotes are removed before assigning the value to the variable. 64 | 65 | When a `$` precedes a variable name, as in `echo "$pass"`, the variable is 66 | expanded to whatever its value is. It's good practice to put double quotes 67 | around variable expansions, as it ensures that the expanded value is passed as 68 | a single argument. If `$pass` contained the value `a b c`, then `echo $pass` 69 | would expand to `echo a b c`, while `echo "$pass"` would expand to 70 | `echo "a b c"` which is usually what you want. 71 | 72 | ## Generating a random string 73 | 74 | Now let's actually generate a random password each time the program is run. 75 | 76 | {{urandom}} 77 | 78 | There's a lot going on in this one-liner. Let's see how to build this one-liner 79 | incrementally, using the shell interactively: 80 | 81 | ```bash 82 | $ cat /dev/urandom 83 | ``` 84 | 85 | (The `$` is just a prompt to show that the command is to be typed at the shell, 86 | so for this example you want to type `cat /dev/urandom`.) 87 | 88 | [`/dev/random`](https://en.wikipedia.org/wiki//dev/random) is a special device 89 | file that produces an infinite stream of random bytes. If it doesn't have 90 | enough environmental noise to generate cryptographically secure random numbers, 91 | then it will [block](https://en.wikipedia.org/wiki/Blocking_(computing)) until 92 | until it does. `/dev/urandom` is an alternative to `/dev/random` that never 93 | blocks, at the cost of being possibly slightly less random. It is still 94 | intended to be used for cryptographic purposes though, so `pass` uses 95 | `/dev/urandom` as its source of randomness. 96 | 97 | You'll get a lot of garbage output from the above command because a lot of the 98 | bytes won't be printable ASCII characters. Press Ctrl-C to make it 99 | stop. 100 | 101 | ```bash 102 | $ LC_ALL=C tr -dc "[:graph:]" < /dev/urandom 103 | ``` 104 | 105 | This command uses [`tr`](https://en.wikipedia.org/wiki/Tr_(Unix)) to remove all 106 | the non-**graph**ical characters from the random stream of bytes. A graphical 107 | character is any ordinary ASCII character that isn't whitespace. `tr` is 108 | typically used to **tr**anslate characters, as in `tr 013 ole << 2 | 3 | 4 | 5 | 12 | 13 | 14 | 15 | 16 | 18 | 21 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 34 | 35 | 36 | 38 | 39 | 41 | 43 | 44 | 47 | 49 | 51 | 53 | 54 | 55 | 56 | 58 | 60 | 61 | 63 | 65 | 66 | 67 | 68 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 79 | 80 | 82 | 83 | 85 | 86 | 87 | 88 | 89 | 90 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 100 | 102 | 103 | 104 | 106 | 107 | 110 | 111 | 112 | 113 | 114 | 115 | 117 | 118 | 120 | 122 | 124 | 125 | 127 | 128 | 129 | 130 | 131 | 132 | 133 | 134 | 136 | 137 | 139 | 141 | 142 | 143 | 144 | 146 | 148 | 149 | 150 | 153 | 155 | 158 | 160 | 161 | 162 | 163 | 166 | 167 | 169 | 170 | 171 | 173 | 174 | 176 | 177 | 178 | 179 | 180 | 182 | 183 | 184 | 186 | 188 | 190 | 191 | 192 | 193 | 195 | 197 | 199 | 200 | 202 | 203 | 204 | 205 | 207 | 208 | 209 | 210 | 212 | 213 | 215 | 217 | 219 | 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width: 850px; 18 | margin: 18px auto; 19 | } 20 | 21 | .bar { 22 | display: block; 23 | width: 100%; 24 | background-color: #ceb; 25 | box-shadow: 0px 0px 15px 1px #ddd; 26 | } 27 | 28 | .bar > nav { 29 | display: flex; 30 | justify-content: space-between; 31 | width: 850px; 32 | margin: 0 auto; 33 | } 34 | 35 | footer.bar > nav { 36 | justify-content: center; 37 | } 38 | 39 | .bar > nav > a { 40 | display: block; 41 | padding: 2px 0 4px 0; 42 | color: #152; 43 | } 44 | 45 | #version { 46 | text-align: right; 47 | font-size: 12px; 48 | font-family: 'Fira Mono', monospace; 49 | padding-right: 5px; 50 | } 51 | 52 | #version a { 53 | color: #333; 54 | } 55 | 56 | h1, h2, h3, h4, h5, h6 { 57 | font-family: 'Work Sans', Futura, Helvetica, Arial, sans-serif; 58 | color: #222; 59 | line-height: 100%; 60 | margin-top: 32px; 61 | } 62 | 63 | h2 a, h3 a, h4 a { 64 | color: inherit; 65 | text-decoration: none; 66 | } 67 | 68 | h2 a::before, h3 a::before, h4 a::before { 69 | content: '#'; 70 | 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code { 124 | font-weight: normal; 125 | } 126 | 127 | kbd { 128 | font-family: 'Fira Mono', monospace; 129 | border-radius: 3px; 130 | padding: 2px 3px; 131 | box-shadow: 1px 1px 1px #777; 132 | margin: 2px; 133 | font-size: 14px; 134 | background: #f7f7f7; 135 | font-weight: 500; 136 | color: #555; 137 | white-space: nowrap; 138 | } 139 | 140 | h1 kbd, h2 kbd, h3 kbd, h4 kbd, h5 kbd, h6 kbd { 141 | font-size: 80%; 142 | } 143 | 144 | .diff code { 145 | font-size: 14px; 146 | line-height: 20px; 147 | background-color: none; 148 | padding: 0; 149 | margin-bottom: 18px; 150 | white-space: inherit; 151 | } 152 | 153 | .diff pre { 154 | background-color: #fffcfa; 155 | padding: 5px 0; 156 | } 157 | 158 | .diff { 159 | border: 1px solid #ede7e3; 160 | border-radius: 3px; 161 | margin-top: 18px; 162 | } 163 | 164 | .diff .diff-header { 165 | display: flex; 166 | justify-content: space-between; 167 | padding: 0 5px; 168 | background-color: #ede7e3; 169 | font-size: 16px; 170 | color: #666; 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.diff .line { 228 | display: block; 229 | height: 20px; 230 | padding: 0 5px; 231 | position: relative; 232 | } 233 | 234 | .diff .line.folded { 235 | background-color: #eef; 236 | opacity: 0.5; 237 | } 238 | 239 | .diff ins.line { 240 | background-color: #ffd; 241 | text-decoration: none; 242 | } 243 | 244 | .diff ins.line::after { 245 | display: block; 246 | content: ''; 247 | width: 20px; 248 | height: 20px; 249 | background-image: url('i/arrow.png'); 250 | background-size: 20px 20px; 251 | position: absolute; 252 | right: -24px; 253 | top: 0; 254 | } 255 | 256 | .diff del.line { 257 | background-color: #fdd; 258 | text-decoration: line-through; 259 | } 260 | 261 | .diff del.line::after { 262 | display: block; 263 | content: ''; 264 | width: 20px; 265 | height: 20px; 266 | background-image: url('i/x.png'); 267 | background-size: 20px 20px; 268 | position: absolute; 269 | right: -24px; 270 | top: 0; 271 | } 272 | 273 | @media screen and (max-width: 850px) { 274 | #container { 275 | width: auto; 276 | margin: 18px 0; 277 | padding: 0 5px; 278 | } 279 | 280 | .bar > nav { 281 | width: auto; 282 | margin: 0; 283 | padding: 0 5px; 284 | } 285 | 286 | .highlight { 287 | overflow-x: scroll; 288 | } 289 | 290 | .diff .line { 291 | width: 850px; 292 | } 293 | 294 | .diff ins.line::after, .diff del.line::after { 295 | display: none; 296 | } 297 | } 298 | 299 | -------------------------------------------------------------------------------- /doc/html_in/template.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | {{title}} 7 | 8 | 9 | 10 |
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24 | 25 | 26 | 27 | -------------------------------------------------------------------------------- /leg.yml: -------------------------------------------------------------------------------- 1 | --- 2 | :name: pass 3 | :version: "0.0.1" 4 | :title: Build Your Own Password Manager 5 | :sync: repo 6 | :rouge_theme: github 7 | :bold_weight: 500 8 | :repo_author: 9 | :name: snaptoken 10 | :email: snaptoken@viewsourcecode.org 11 | ... 12 | -------------------------------------------------------------------------------- /steps.diff.LICENSE: -------------------------------------------------------------------------------- 1 | Password Store is Copyright (C) 2012-2016 Jason A. Donenfeld . All Rights Reserved. 2 | 3 | This program is free software; you can redistribute it and/or modify 4 | it under the terms of the GNU General Public License as published by 5 | the Free Software Foundation; either version 2 of the License, or 6 | (at your option) any later version. 7 | 8 | This program is distributed in the hope that it will be useful, 9 | but WITHOUT ANY WARRANTY; without even the implied warranty of 10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 | GNU General Public License for more details. 12 | 13 | 14 | 15 | GNU GENERAL PUBLIC LICENSE 16 | Version 2, June 1991 17 | 18 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 19 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 | Everyone is permitted to copy and distribute verbatim copies 21 | of this license document, but changing it is not allowed. 22 | 23 | Preamble 24 | 25 | The licenses for most software are designed to take away your 26 | freedom to share and change it. By contrast, the GNU General Public 27 | License is intended to guarantee your freedom to share and change free 28 | software--to make sure the software is free for all its users. This 29 | General Public License applies to most of the Free Software 30 | Foundation's software and to any other program whose authors commit to 31 | using it. (Some other Free Software Foundation software is covered by 32 | the GNU Lesser General Public License instead.) You can apply it to 33 | your programs, too. 34 | 35 | When we speak of free software, we are referring to freedom, not 36 | price. Our General Public Licenses are designed to make sure that you 37 | have the freedom to distribute copies of free software (and charge for 38 | this service if you wish), that you receive source code or can get it 39 | if you want it, that you can change the software or use pieces of it 40 | in new free programs; and that you know you can do these things. 41 | 42 | To protect your rights, we need to make restrictions that forbid 43 | anyone to deny you these rights or to ask you to surrender the rights. 44 | These restrictions translate to certain responsibilities for you if you 45 | distribute copies of the software, or if you modify it. 46 | 47 | For example, if you distribute copies of such a program, whether 48 | gratis or for a fee, you must give the recipients all the rights that 49 | you have. You must make sure that they, too, receive or can get the 50 | source code. And you must show them these terms so they know their 51 | rights. 52 | 53 | We protect your rights with two steps: (1) copyright the software, and 54 | (2) offer you this license which gives you legal permission to copy, 55 | distribute and/or modify the software. 56 | 57 | Also, for each author's protection and ours, we want to make certain 58 | that everyone understands that there is no warranty for this free 59 | software. If the software is modified by someone else and passed on, we 60 | want its recipients to know that what they have is not the original, so 61 | that any problems introduced by others will not reflect on the original 62 | authors' reputations. 63 | 64 | Finally, any free program is threatened constantly by software 65 | patents. We wish to avoid the danger that redistributors of a free 66 | program will individually obtain patent licenses, in effect making the 67 | program proprietary. To prevent this, we have made it clear that any 68 | patent must be licensed for everyone's free use or not licensed at all. 69 | 70 | The precise terms and conditions for copying, distribution and 71 | modification follow. 72 | 73 | GNU GENERAL PUBLIC LICENSE 74 | TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 75 | 76 | 0. This License applies to any program or other work which contains 77 | a notice placed by the copyright holder saying it may be distributed 78 | under the terms of this General Public License. The "Program", below, 79 | refers to any such program or work, and a "work based on the Program" 80 | means either the Program or any derivative work under copyright law: 81 | that is to say, a work containing the Program or a portion of it, 82 | either verbatim or with modifications and/or translated into another 83 | language. (Hereinafter, translation is included without limitation in 84 | the term "modification".) Each licensee is addressed as "you". 85 | 86 | Activities other than copying, distribution and modification are not 87 | covered by this License; they are outside its scope. The act of 88 | running the Program is not restricted, and the output from the Program 89 | is covered only if its contents constitute a work based on the 90 | Program (independent of having been made by running the Program). 91 | Whether that is true depends on what the Program does. 92 | 93 | 1. You may copy and distribute verbatim copies of the Program's 94 | source code as you receive it, in any medium, provided that you 95 | conspicuously and appropriately publish on each copy an appropriate 96 | copyright notice and disclaimer of warranty; keep intact all the 97 | notices that refer to this License and to the absence of any warranty; 98 | and give any other recipients of the Program a copy of this License 99 | along with the Program. 100 | 101 | You may charge a fee for the physical act of transferring a copy, and 102 | you may at your option offer warranty protection in exchange for a fee. 103 | 104 | 2. 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Any attempt 188 | otherwise to copy, modify, sublicense or distribute the Program is 189 | void, and will automatically terminate your rights under this License. 190 | However, parties who have received copies, or rights, from you under 191 | this License will not have their licenses terminated so long as such 192 | parties remain in full compliance. 193 | 194 | 5. You are not required to accept this License, since you have not 195 | signed it. However, nothing else grants you permission to modify or 196 | distribute the Program or its derivative works. These actions are 197 | prohibited by law if you do not accept this License. Therefore, by 198 | modifying or distributing the Program (or any work based on the 199 | Program), you indicate your acceptance of this License to do so, and 200 | all its terms and conditions for copying, distributing or modifying 201 | the Program or works based on it. 202 | 203 | 6. 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In such case, this License incorporates 249 | the limitation as if written in the body of this License. 250 | 251 | 9. The Free Software Foundation may publish revised and/or new versions 252 | of the General Public License from time to time. Such new versions will 253 | be similar in spirit to the present version, but may differ in detail to 254 | address new problems or concerns. 255 | 256 | Each version is given a distinguishing version number. If the Program 257 | specifies a version number of this License which applies to it and "any 258 | later version", you have the option of following the terms and conditions 259 | either of that version or of any later version published by the Free 260 | Software Foundation. If the Program does not specify a version number of 261 | this License, you may choose any version ever published by the Free Software 262 | Foundation. 263 | 264 | 10. If you wish to incorporate parts of the Program into other free 265 | programs whose distribution conditions are different, write to the author 266 | to ask for permission. For software which is copyrighted by the Free 267 | Software Foundation, write to the Free Software Foundation; we sometimes 268 | make exceptions for this. Our decision will be guided by the two goals 269 | of preserving the free status of all derivatives of our free software and 270 | of promoting the sharing and reuse of software generally. 271 | 272 | NO WARRANTY 273 | 274 | 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 275 | FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 276 | OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 277 | PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 278 | OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 279 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 285 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 286 | REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 287 | INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 288 | OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 289 | TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 290 | YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 291 | PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 292 | POSSIBILITY OF SUCH DAMAGES. 293 | 294 | END OF TERMS AND CONDITIONS 295 | 296 | How to Apply These Terms to Your New Programs 297 | 298 | If you develop a new program, and you want it to be of the greatest 299 | possible use to the public, the best way to achieve this is to make it 300 | free software which everyone can redistribute and change under these terms. 301 | 302 | To do so, attach the following notices to the program. It is safest 303 | to attach them to the start of each source file to most effectively 304 | convey the exclusion of warranty; and each file should have at least 305 | the "copyright" line and a pointer to where the full notice is found. 306 | 307 | 308 | Copyright (C) 309 | 310 | This program is free software; you can redistribute it and/or modify 311 | it under the terms of the GNU General Public License as published by 312 | the Free Software Foundation; either version 2 of the License, or 313 | (at your option) any later version. 314 | 315 | This program is distributed in the hope that it will be useful, 316 | but WITHOUT ANY WARRANTY; without even the implied warranty of 317 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 318 | GNU General Public License for more details. 319 | 320 | You should have received a copy of the GNU General Public License along 321 | with this program; if not, write to the Free Software Foundation, Inc., 322 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 323 | 324 | Also add information on how to contact you by electronic and paper mail. 325 | 326 | If the program is interactive, make it output a short notice like this 327 | when it starts in an interactive mode: 328 | 329 | Gnomovision version 69, Copyright (C) year name of author 330 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 331 | This is free software, and you are welcome to redistribute it 332 | under certain conditions; type `show c' for details. 333 | 334 | The hypothetical commands `show w' and `show c' should show the appropriate 335 | parts of the General Public License. Of course, the commands you use may 336 | be called something other than `show w' and `show c'; they could even be 337 | mouse-clicks or menu items--whatever suits your program. 338 | 339 | You should also get your employer (if you work as a programmer) or your 340 | school, if any, to sign a "copyright disclaimer" for the program, if 341 | necessary. Here is a sample; alter the names: 342 | 343 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 344 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 345 | 346 | , 1 April 1989 347 | Ty Coon, President of Vice 348 | 349 | This General Public License does not permit incorporating your program into 350 | proprietary programs. If your program is a subroutine library, you may 351 | consider it more useful to permit linking proprietary applications with the 352 | library. If this is what you want to do, use the GNU Lesser General 353 | Public License instead of this License. 354 | 355 | 356 | --------------------------------------------------------------------------------