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torcircuit.sh
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torcircuit.sh
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#!/usr/bin/env bash
##
## torcircuit - open new Tor circuit by restarting services
## Copyright (C) 2020-2023 Daniel Haase
##
## This program is free software: you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program. If not, see
## <http://www.gnu.org/licenses/gpl.txt>.
##
set -o errexit
set -o nounset
set -o pipefail
set -o noclobber
TITLE="torcircuit"
VERSION="0.4.0"
SOCKS_PROXY="${SOCKS_PROXY:-"localhost:9050"}"
IP_LOOKUP_URL="${IP_LOOKUP_URL:-"https://api.ipify.org"}"
function check_command {
if ! command -v "${1}" &>/dev/null; then
echo >&2 "no such command \"${1}\""
exit 1
fi
}
function print_version {
cat <<-EOF
${TITLE} ${VERSION}
copyright (c) 2020-2023 Daniel Haase
EOF
}
function print_usage {
print_version
cat <<-EOF
usage: ${TITLE} [--version | --help]
-V | --version
print version information and exit
-h | --help
print this usage description and exit
EOF
}
function has_network_connection {
[[ -n "$(ip route)" ]]
} &>/dev/null
function has_tor_instance {
pgrep '^tor$'
} &>/dev/null
function is_tor_running {
[[ "$(systemctl status tor |
awk '/Active/ { print $2" "$3 }')" == "active (running)" ]]
} &>/dev/null
function is_circuit_established {
systemctl status tor |
grep --max-count=1 --fixed-strings --quiet \
"Bootstrapped 100% (done): Done"
} &>/dev/null
function get_tor_address {
local proxy_url
if [[ "${SOCKS_PROXY}" != "socks5://"* ]]; then
proxy_url="socks5://${SOCKS_PROXY}"
else
proxy_url="${SOCKS_PROXY}"
fi
curl --proxy "${proxy_url}" --connect-timeout 5 --silent \
"${IP_LOOKUP_URL}"
} 2>/dev/null
function restart_tor_service {
systemctl restart tor &>/dev/null || {
echo >&2 "failed to open new tor circuit"
exit 3
}
sleep 5
}
check_command "awk"
check_command "cat"
check_command "curl"
check_command "grep"
check_command "ip"
check_command "pgrep"
check_command "systemctl"
check_command "tor"
if [[ $# -eq 1 ]]; then
case "${1}" in
-V | --version)
print_version
exit 0
;;
-h | --help)
print_usage
exit 0
;;
*)
print_usage
exit 2
;;
esac
elif [[ $# -gt 1 ]]; then
print_usage
exit 2
fi
if ! has_network_connection; then
echo >&2 "no network connection detected"
exit 3
fi
if ! has_tor_instance; then
echo >&2 "no running tor daemon detected"
#exit 3
fi
if ! is_tor_running; then
echo >&2 "tor service not running"
#exit 3
fi
declare old_address
declare new_address
declare -i exit_code
if is_circuit_established; then
old_address="$(get_tor_address)" || {
echo >&2 "failed to get old tor exit relay ip address"
}
else
echo >&2 "no previous tor circuit established"
old_address="none"
fi
restart_tor_service
if is_circuit_established; then
exit_code=0
new_address="$(get_tor_address)" || {
echo >&2 "failed to get new tor exit relay ip address"
new_address="none"
exit_code=4
}
else
echo >&2 "failed to establish new tor circuit in time"
new_address="none"
exit_code=5
fi
cat <<-EOF
tor exit relay ip address:
old: ${old_address}
new: ${new_address}
EOF
exit "${exit_code}"