print_bridgeline.sh

gistfile1.txt

#!/usr/bin/env bash
#
# This script extracts the pieces that we need to compile our bridge line.
# This will have to do until the following bug is fixed:
# <https://gitlab.torproject.org/tpo/core/tor/-/issues/29128>

TOR_DAEMON=tor@default
PT_STATE=/var/lib/tor/pt_state/obfs4_bridgeline.txt

addr=$(journalctl -u "$TOR_DAEMON" | grep 'is reachable from the outside' | grep -vP "\[.+:.*\[" | \
    grep -Po "(?:[0-9]{1,3}\.){3}[0-9]{1,3}" | \
    tail -1)

port=$(journalctl -u "$TOR_DAEMON" | grep "Registered server transport 'obfs4' at" | \
    sed "s/.*:\([0-9]\{1,5\}\)'$/\1/" | \
    tail -1)
fingerprint=$(journalctl -u "$TOR_DAEMON" | grep "Your Tor server's identity key *fingerprint is" | \
    sed "s/.*\([0-9A-F]\{40\}\)'$/\1/" | \
    tail -1)
obfs4_args=$(grep '^Bridge obfs4' "$PT_STATE" | sed 's/.*\(cert=.*\)/\1/' | \
    tail -1)

if [[ "$addr" = "" || "$port" = "" || "$fingerprint" = "" || "$obfs4_args" = "" ]]
then
    echo "Could not create bridge line. Tor's log format may have changed. This is a bug."
    exit 1
fi

echo "obfs4 ${addr}:${port} ${fingerprint} ${obfs4_args}"