Cloned from elvizlai/grpc-socks to fix some points:
- Allow insecure gRPC
- Prevent client death when DNS resolver fails
- Remove local dialing
- Server now runs in Alpine Linux and Raspberry Pi
- Use system DNS resolver (including /etc/hosts) if available
-
Run make to build binaries
-
Build the docker image
docker build . -t grpcserver:latest
First: Deploy server.
And launch client:
./exec_bin/client-linux -l 127.0.0.1:40000 -r grpcserver:9444 -d
curl -x socks5://127.0.0.1:40000/ https://something.internal
nc -X 5 -x 127.0.0.1:40000 192.168.451.23 443
ssh -o ProxyCommand='nc -X 5 -x 127.0.0.1:40000 %h %p' [email protected]
Useful options:
ssh \
-o ProxyCommand='nc -X 5 -x 127.0.0.1:40000 %h %p' \
-o StrictHostKeyChecking=no \
-o UserKnownHostsFile=/dev/null \
[email protected]
mkfifo fifo
nc -l 636 0<fifo | nc -X 5 -x 127.0.0.1:40000 internalserver.local 636 1>fifo
If close: Bad file descriptor try nc -4.
Traditional:
nc -l -p 8001 -c "nc 127.0.0.1 8000"
Busybox:
nc -v -lk -p 8001 -e /usr/bin/nc 127.0.0.1 8000
Enable NAT:
iptables -A PREROUTING -t nat -p tcp -i eth0 --dport 80 -j DNAT --to-destination 192.264.1.176:8000
Change the original IP to the intermediate box:
iptables -A POSTROUTING -t nat -p tcp -d 192.264.1.176 --dport 8000 -j MASQUERADE
Allow packet forwarding:
iptables -A FORWARD -p tcp -j ACCEPT
Enable kernel forwarding:
sysctl net.ipv4.conf.eth0.forwarding=1
To delete iptables rules just change -A to -D.
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