gists/networking/dynamic-ssh-forwarding.md

Set up port forwarding

1. Set up port forwarding

   $ ssh -D 8080 -N ubuntu@mercurial-manfifold.eu
   

2. Try out connection

   $ curl --socks5 127.0.0.1:8080 http://example.com
   

Set system-wide proxy configuration

1. Create /etc/profile.d/proxy.sh with the following content:

   #!/bin/bash
   
    if [ -f "/etc/proxy-enabled" ]; then
        export all_proxy="socks5://127.0.0.1:8080"
        export http_proxy="socks5://127.0.0.1:8080"
        export https_proxy="socks5://127.0.0.1:8080"
        export ftp_proxy="socks5://127.0.0.1:8080"
        export HTTP_PROXY="socks5://127.0.0.1:8080"
        export HTTPS_PROXY="socks5://127.0.0.1:8080"
        export FTP_PROXY="socks5://127.0.0.1:8080"
        export no_proxy="localhost,127.0.0.1,::1"
        export NO_PROXY="localhost,127.0.0.1,::1"
    fi
   

2. Add the following to .zshrc:

   alias proxy-on='sudo touch /etc/proxy-enabled'
   alias proxy-off='sudo rm -f /etc/proxy-enabled'
   

Note that enabling or disabling the proxy only takes effect after logging out and back in, as that is when /etc/profile.d/proxy.sh is sourced.