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240 lines
8.4 KiB
Markdown
240 lines
8.4 KiB
Markdown
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<p align="center">
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<img
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src="https://user-images.githubusercontent.com/6550035/46709024-9b23ad00-cbf6-11e8-9fb2-ca8b20b7dbec.jpg"
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width="408px" border="0" alt="croc">
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<br>
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<a href="https://github.com/schollz/croc/releases/latest"><img src="https://img.shields.io/badge/version-v9.0.0-brightgreen.svg?style=flat-square" alt="Version"></a>
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<a href="https://coveralls.io/github/schollz/croc"><img src="https://img.shields.io/badge/coverage-81%25-green.svg?style=flat-square" alt="Coverage"></a>
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<a href="https://travis-ci.org/schollz/croc"><img
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src="https://img.shields.io/travis/schollz/croc.svg?style=flat-square" alt="Build
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Status"></a>
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<p align="center">This project is supported by:</p>
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<p align="center">
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<a href="https://www.digitalocean.com/">
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<img src="https://opensource.nyc3.cdn.digitaloceanspaces.com/attribution/assets/SVG/DO_Logo_horizontal_blue.svg" width="201px">
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</a>
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</p>
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</p>
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`croc` is a tool that allows any two computers to simply and securely transfer files and folders. AFAIK, *croc* is the only CLI file-transfer tool that does **all** of the following:
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- allows **any two computers** to transfer data (using a relay)
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- provides **end-to-end encryption** (using PAKE)
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- enables easy **cross-platform** transfers (Windows, Linux, Mac)
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- allows **multiple file** transfers
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- allows **resuming transfers** that are interrupted
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- local server or port-forwarding **not needed**
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- **ipv6-first** with ipv4 fallback
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- can **use proxy**, like tor
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For more information about `croc`, see [my blog post](https://schollz.com/software/croc6).
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## Install
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Download [the latest release for your system](https://github.com/schollz/croc/releases/latest), or install a release from the command-line:
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```
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curl https://getcroc.schollz.com | bash
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```
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On macOS you can install the latest release with [Homebrew](https://brew.sh/):
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```
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brew install croc
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```
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On macOS you can also install the latest release with [MacPorts](https://macports.org/):
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```
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sudo port selfupdate
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sudo port install croc
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```
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On Windows you can install the latest release with [Scoop](https://scoop.sh/) or [Chocolatey](https://chocolatey.org):
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```
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scoop install croc
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```
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```
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choco install croc
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```
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On Unix you can install the latest release with [Nix](https://nixos.org/nix):
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```
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nix-env -i croc
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```
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On Alpine Linux you have to install dependencies first:
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```
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apk add bash coreutils
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wget -qO- https://getcroc.schollz.com | bash
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```
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On Arch Linux you can install the latest release with `pacman`:
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```
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pacman -S croc
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```
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On Gentoo you can install with `portage`:
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```
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emerge net-misc/croc
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```
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On Termux you can install with `pkg`:
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```
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pkg install croc
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```
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On FreeBSD you can install with `pkg`:
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```
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pkg install croc
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```
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Or, you can [install Go](https://golang.org/dl/) and build from source (requires Go 1.12+):
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```
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GO111MODULE=on go get -v github.com/schollz/croc/v9
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```
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## Usage
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To send a file, simply do:
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```
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$ croc send [file(s)-or-folder]
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Sending 'file-or-folder' (X MB)
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Code is: code-phrase
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```
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Then to receive the file (or folder) on another computer, you can just do
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```
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croc code-phrase
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```
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The code phrase is used to establish password-authenticated key agreement ([PAKE](https://en.wikipedia.org/wiki/Password-authenticated_key_agreement)) which generates a secret key for the sender and recipient to use for end-to-end encryption.
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There are a number of configurable options (see `--help`). A set of options (like custom relay, ports, and code phrase) can be set using `--remember`.
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### Custom code phrase
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You can send with your own code phrase (must be more than 6 characters).
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```
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croc send --code [code-phrase] [file(s)-or-folder]
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```
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### Allow overwriting without prompt
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By default, croc will prompt whether to overwrite a file. You can automatically overwrite files by using the `--overwrite` flag (recipient only). For example, receive a file to automatically overwrite:
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```
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croc --yes --overwrite <code>
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```
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### Use pipes - stdin and stdout
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You can pipe to `croc`:
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```
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cat [filename] | croc send
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```
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In this case `croc` will automatically use the stdin data and send and assign a filename like "croc-stdin-123456789". To receive to `stdout` at you can always just use the `--yes` will automatically approve the transfer and pipe it out to `stdout`.
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```
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croc --yes [code-phrase] > out
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```
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All of the other text printed to the console is going to `stderr` so it will not interfere with the message going to `stdout`.
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### Send text
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Sometimes you want to send URLs or short text. In addition to piping, you can easily send text with `croc`:
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```
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croc send --text "hello world"
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```
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This will automatically tell the receiver to use `stdout` when they receive the text so it will be displayed.
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### Use a proxy
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You can use a proxy as your connection to the relay by adding a proxy address with `--socks5`. For example, you can send via a tor relay:
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```
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croc --socks5 "127.0.0.1:9050" send SOMEFILE
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```
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### Change encryption curve
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You can choose from several different elliptic curves to use for encryption by using the `--curve` flag. Only the recipient can choose the curve. For example, receive a file using the P-521 curve:
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```
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croc --curve p521 <codephrase>
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```
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Available curves are P-256, P-348, P-521 and SIEC. SIEC is the default curve used, it is a lesser known curve that belongs to a class of "super-isolated" curves which has security that does not reduce to the security of curves around it. (Scholl, Travis. Experimental Mathematics 28.4 (2019): 385-397)
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### Self-host relay
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The relay is needed to staple the parallel incoming and outgoing connections. By default, `croc` uses a public relay but you can also run your own relay:
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```
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croc relay
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```
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By default it uses TCP ports 9009-9013. Make sure to open those up. You can customized the ports (e.g. `croc relay --ports 1111,1112`), but you must have a minimum of **2** ports for the relay. The first port is for communication and the subsequent ports are used for the multiplexed data transfer.
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You can send files using your relay by entering `--relay` to change the relay that you are using if you want to custom host your own.
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```
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croc --relay "myrelay.example.com:9009" send [filename]
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```
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Note, when sending, you only need to include the first port (the communication port). The subsequent ports for data transfer will be transmitted back to the user from the relay.
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#### Self-host relay (docker)
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If it's easier you can also run a relay with Docker:
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```
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docker run -d -p 9009-9013:9009-9013 -e CROC_PASS='YOURPASSWORD' schollz/croc
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```
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Be sure to include the password for the relay otherwise any requests will be rejected.
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```
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croc --pass YOURPASSWORD --relay "myreal.example.com:9009" send [filename]
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```
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Note: when including `--pass YOURPASSWORD` you can instead pass a file with the password, e.g. `--pass FILEWITHPASSWORD`.
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## License
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MIT
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## Acknowledgements
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`croc` has gone through many iterations, and I am awed by all the great contributions! If you feel like contributing, in any way, by all means you can send an Issue, a PR, ask a question, or tweet me ([@yakczar](http://ctt.ec/Rq054)).
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Thanks [@warner](https://github.com/warner) for the [idea](https://github.com/warner/magic-wormhole), [@tscholl2](https://github.com/tscholl2) for the [encryption gists](https://gist.github.com/tscholl2/dc7dc15dc132ea70a98e8542fefffa28), [@skorokithakis](https://github.com/skorokithakis) for [code on proxying two connections](https://www.stavros.io/posts/proxying-two-connections-go/). Finally thanks for making pull requests [@maximbaz](https://github.com/maximbaz), [@meyermarcel](https://github.com/meyermarcel), [@Girbons](https://github.com/Girbons), [@techtide](https://github.com/techtide), [@heymatthew](https://github.com/heymatthew), [@Lunsford94](https://github.com/Lunsford94), [@lummie](https://github.com/lummie), [@jesuiscamille](https://github.com/jesuiscamille), [@threefjord](https://github.com/threefjord), [@marcossegovia](https://github.com/marcossegovia), [@csleong98](https://github.com/csleong98), [@afotescu](https://github.com/afotescu), [@callmefever](https://github.com/callmefever), [@El-JojA](https://github.com/El-JojA), [@anatolyyyyyy](https://github.com/anatolyyyyyy), [@goggle](https://github.com/goggle), [@smileboywtu](https://github.com/smileboywtu), [@nicolashardy](https://github.com/nicolashardy), [@fbartels](https://github.com/fbartels), [@rkuprov](https://github.com/rkuprov), [@hreese](https://github.com/hreese), [@xenrox](https://github.com/xenrox) and [Ipar](https://github.com/lpar)!
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