scar is a pure-Perl no-dependency utility to support file transfers via HTTP.
scar [--usage] [--help] [--man] [--version]
scar [--host|-h hostname]
[--port|-p port]
[--root|-r root-directory]
# serve current directory, dynamic port, any local address
me@myserver$ scar
server started, you can connect to http://myserver:54321/
# set a specific port
me@myserver$ scar -p 8080
server started, you can connect to http://myserver:8080/
# bind to localhost only, on specific port
me@myserver$ scar -p 8080 -h localhost
server started, you can connect to http://127.0.0.1:8080/
# set the path to be served, can be a file or a directory
me@myserver$ scar -r shared-stuff.tar.gz
server started, you can connect to http://myserver:53412/
me@myserver$ scar -r /tmp
server started, you can connect to http://myserver:35142/
scar helps you when you want to quickly share a local directory or file with someone remotely, e.g. when you don’t want (or can not) send it by email.
scar requires that there is the possibility for the remote end to set up a TCP connection to your machine, otherwise it’s pretty dull. This connection might be over a SSH tunnel, anyway, so don’t feel defeated too early.
The most simple use case is when you want to share all the files (and subdirectories) of the directory you’re currently in:
me@myserver$ scar
server started, you can connect to http://myserver:54321/
Now you can provide the printed URI to your peer to let her start the download.
Note that myserver might be something that is not reachable from the
outside. If this is the case, you have to substitute myserver with an
IP address that can be used to reach your machine.
Another popular use case - possibly more than the previous one - is
when you just want to share a file. In this case you only need --root:
me@myserver$ scar -r shared-stuff.tar.gz
server started, you can connect to http://myserver:53412/
The same goes if you want to share a whole directory that is not the current one:
me@myserver$ scar -r /tmp
server started, you can connect to http://myserver:35142/
If you have only a limited range of available ports - e.g. because you have some firewall in between, or a NAT - you can fix the port instead of leaving the dynamic allocation:
me@myserver$ scar -p 8080
server started, you can connect to http://myserver:8080/
Another interesting option is the possibility to set the local address
where you want to listen, e.g. restrict the access to localhost only:
me@myserver$ scar -p 8080 -h localhost
server started, you can connect to http://127.0.0.1:8080/
This restricts the access only to those that have access to localhost. How can this be useful? For example, suppose that both you and your peer have access to a shared server, you could set up this:
me@myserver$ ssh -R 54321:localhost:8080 me@sharedserver
and your peer could do this:
you@yourserver$ ssh -L 33333:localhost:54321 you@sharedserver
and then, with all this circus going on:
you@yourserver$ curl http://localhost:33333/
will tunnel the peer’s request through her ssh connection to the shared server, which will in turn retunnel it through your connection from myserver.
In case it’s OK you can spare the peer the tunnel and set a bind address when connecting:
me@myserver$ ssh -R public-ip:54321:localhost:8080 me@sharedserver
In this case, the tunnel will instruct the sshd daemon on sharedserver to listen to any available address instead of localhost only.
Copyright (c) 2011, Flavio Poletti "flavio@polettix.it". All rights reserved.
This script is free software; you can redistribute it and/or modify it under the Artistic License 2.0.
Questo script è software libero: potete ridistribuirlo e/o modificarlo nei termini della Artistic License 2.0.
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