`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 does **all** of the following: - allows **any two computers** to transfer data (using a relay) - provides **end-to-end encryption** (using PAKE) - enables easy **cross-platform** transfers (Windows, Linux, Mac) - allows **multiple file** transfers - allows **resuming transfers** that are interrupted - local server or port-forwarding **not needed** - **faster** than [wormhole](https://github.com/warner/magic-wormhole), [rsync](https://linux.die.net/man/1/rsync), [scp](https://linux.die.net/man/1/scp) through compression and multiplexing (speedups 1.5x to 4x) For more information about `croc`, see [my blog post](https://schollz.com/software/croc6).  ## Install Download [the latest release for your system](https://github.com/schollz/croc/releases/latest), or install a release from the command-line: ``` $ curl https://getcroc.schollz.com | bash ``` On macOS you can install the latest release with [Homebrew](https://brew.sh/): ``` $ brew install schollz/tap/croc ``` On Windows you can install the latest release with [Scoop](https://scoop.sh/): ``` $ scoop install croc ``` On Unix you can install the latest release with [Nix](https://nixos.org/nix): ``` $ nix-env -i croc ``` On Arch Linux you can install the latest release with `pacman`: ``` $ pacman -S croc ``` On Ubuntu you can install with `snap`: ``` $ snap install croc ``` Or, you can [install Go](https://golang.org/dl/) and build from source (requires Go 1.12+): ``` $ GO111MODULE=on go get -v github.com/schollz/croc/v8 ``` ## Usage To send a file, simply do: ``` $ croc send [file(s)-or-folder] Sending 'file-or-folder' (X MB) Code is: code-phrase ``` Then to receive the file (or folder) on another computer, you can just do ``` $ croc code-phrase ``` 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. 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`. ### Custom code phrase You can send with your own code phrase (must be more than 4 characters). ``` $ croc send --code [code-phrase] [file(s)-or-folder] ``` ### Use pipes - stdin and stdout You can pipe to `croc`: ``` $ cat [filename] | croc send ``` 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`. ``` $ croc --yes [code-phrase] > out ``` All of the other text printed to the console is going to `stderr` so it will not interfere with the message going to `stdout`. ### Self-host relay 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: ``` $ croc relay ``` 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. 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. ``` $ croc --relay "myrelay.example.com:9009" send [filename] ``` 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. #### Self-host relay (docker) If it's easier you can also run a relay with Docker: ``` $ docker run -d -p 9009:9009 -p 9010:9010 -p 9011:9011 -p 9012:9012 -p 9013:9013 -e CROC_PASS='YOURPASSWORD' schollz/croc ``` Be sure to include the password for the relay otherwise any requests will be rejected. ``` $ croc --pass YOURPASSWORD --relay "myreal.example.com:9009" send [filename] ``` ## License MIT ## Acknowledgements `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)). 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) and [@xenrox](https://github.com/xenrox)!