To determine the intermediary nodes (relays) used in a Tor circuit from the command line, you can use the tor client itself or tools like torsocks and curl to query the Tor network. Here’s how you can do it:

Method 1: Using tor with nyx (Recommended)

nyx is a command-line monitoring tool for Tor. It provides a real-time view of your Tor client, including the current circuit and nodes.

1. Install nyx: On Debian/Ubuntu:

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   sudo apt install nyx

   On Arch Linux:

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   sudo pacman -S nyx

2. Run nyx: Start nyx while tor is running:

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   nyx

   • This will display a live dashboard of your Tor client, including the current circuit and the nodes (relays) being used.

Method 2: Using tor Control Port

You can query the Tor control port to get the current circuit information.

1. Enable the Control Port: Edit your torrc configuration file (usually at /etc/tor/torrc or ~/.torrc) and add:

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   ControlPort 9051
   CookieAuthentication 1

   Restart tor:

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   sudo systemctl restart tor

2. Query the Circuit: Use curl or telnet to query the control port. For example:

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   curl --unix-socket /var/run/tor/control -X POST -H "Content-Type: application/x-www-form-urlencoded" -d "GETINFO circuit-status" --user : 2>/dev/null

   • This will return the current circuit status, including the nodes (relays) in use.

   Alternatively, use telnet:

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   telnet localhost 9051

   Then authenticate (if required) and send:

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   GETINFO circuit-status

Method 3: Using torsocks and curl

If you want to see the circuit for a specific connection, you can use torsocks with curl to fetch the circuit information from the Tor network.

1. Install torsocks: On Debian/Ubuntu:

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   sudo apt install torsocks

   On Arch Linux:

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   sudo pacman -S torsocks

2. Query the Circuit: Use torsocks with curl to fetch the circuit information:

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   torsocks curl -s https://check.torproject.org/api/ip | grep -oP '(?<=IP":")[^"]*'

   • This will show the exit node IP. To see the full circuit, you can use:
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   torsocks curl -s https://onionoo.torproject.org/details?type=relay | jq '.relays[] | {nickname, fingerprint, address}'

   • This will list all relays, but you can filter for your specific circuit.

Method 4: Using arm (Anonymizing Relay Monitor)

arm is another command-line tool for monitoring Tor.

1. Install arm: On Debian/Ubuntu:

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   sudo apt install arm

   On Arch Linux:

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   sudo pacman -S arm

2. Run arm: Start arm while tor is running:

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   arm

   • This will display a live view of your Tor client, including the current circuit and nodes.

Method 5: Using stem (Python Library)

If you prefer Python, you can use the stem library to query Tor.

1. Install stem:

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   pip install stem

2. Run a Python Script: Create a script to query the current circuit:

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   from stem.control import Controller
   
   with Controller.from_port(port=9051) as controller:
       controller.authenticate()
       for circuit in controller.get_circuits():
           print(f"Circuit {circuit.id}:")
           for node in circuit.path:
               print(f"  - {node.nickname} ({node.fingerprint})")

   • Run the script:
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     python3 script.py

Summary Table

Would you like help setting up any of these methods?