imux is a go library and corresponding command line tool for inverse multiplexing sockets
An imux client will create a listener and forward data from any connections to that listener to an imux server, using a configurable number of sockets. An imux server receives data and opens corresponding sockets to the final destination. Encryption is done with self-signed TLS and Trust Of First Use (TOFU).
go get github.com/hkparker/imux/...
let's say you wanted to expose an SSH server over imux
server
serve imux on 0.0.0.0:443 and connect out to localhost:22
imux -server --listen=0.0.0.0:443 --dial=localhost:22
client
inverse multiplex over 10 sockets bound to any interface and connect to the server
imux -client --binds='{"0.0.0.0": 10}' --listen=localhost:22 --dial=server:443
now on the client, connect to localhost:22 to ssh to the sever's localhost:22 over the imux connection
ssh localhost
imux can be used to transport a single socket over multiple internet connections using source routing in linux
For example, consider simultaneously using two interfaces:
| Interface | Address | Default Gateway |
|---|---|---|
eth0 |
192.168.1.2 |
192.168.1.1 |
eth1 |
10.0.0.2 |
10.0.0.1 |
create routing tables
echo '128 imux0' >> /etc/iproute2/rt_tables
echo '129 imux1' >> /etc/iproute2/rt_tables
add routes
ip route add default via 192.168.1.1 table imux0 dev eth0
ip route add default via 10.0.0.1 table imux1 dev eth1
add rules
ip rule add from 192.168.1.2 table imux0
ip rule add from 10.0.0.2 table imux1
flush cache
ip route flush cache
connect with binds
here we choose 20 sockets on each interface
imux -client --binds='{"192.168.1.2": 20, "10.0.0.2": 20}' --listen=localhost:22 --dial=server:443