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138 lines
4.2 KiB
138 lines
4.2 KiB
#!/usr/bin/env sh
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# shellcheck disable=SC3043 #https://github.com/koalaman/shellcheck/wiki/SC3043#exceptions
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# Pi-hole: A black hole for Internet advertisements
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# (c) 2017 Pi-hole, LLC (https://pi-hole.net)
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# Network-wide ad blocking via your own hardware.
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#
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# Script to hold utility functions for use in other scripts
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#
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# This file is copyright under the latest version of the EUPL.
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# Please see LICENSE file for your rights under this license.
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# Basic Housekeeping rules
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# - Functions must be self contained
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# - Functions should be grouped with other similar functions
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# - Functions must be documented
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# - New functions must have a test added for them in test/test_any_utils.py
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#######################
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# Takes Three arguments: file, key, and value.
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#
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# Checks the target file for the existence of the key
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# - If it exists, it changes the value
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# - If it does not exist, it adds the value
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#
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# Example usage:
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# addOrEditKeyValPair "/etc/pihole/setupVars.conf" "BLOCKING_ENABLED" "true"
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#######################
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addOrEditKeyValPair() {
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local file="${1}"
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local key="${2}"
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local value="${3}"
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if grep -q "^${key}=" "${file}"; then
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# Key already exists in file, modify the value
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sed -i "/^${key}=/c\\${key}=${value}" "${file}"
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else
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# Key does not already exist, add it and it's value
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echo "${key}=${value}" >> "${file}"
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fi
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}
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#######################
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# Takes two arguments: file, and key.
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# Adds a key to target file
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#
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# Example usage:
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# addKey "/etc/dnsmasq.d/01-pihole.conf" "log-queries"
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#######################
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addKey(){
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local file="${1}"
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local key="${2}"
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if ! grep -q "^${key}" "${file}"; then
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# Key does not exist, add it.
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echo "${key}" >> "${file}"
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fi
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}
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#######################
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# Takes two arguments: file, and key.
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# Deletes a key or key/value pair from target file
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#
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# Example usage:
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# removeKey "/etc/pihole/setupVars.conf" "PIHOLE_DNS_1"
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#######################
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removeKey() {
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local file="${1}"
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local key="${2}"
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sed -i "/^${key}/d" "${file}"
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}
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#######################
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# returns FTL's current telnet API port based on the setting in /etc/pihole-FTL.conf
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########################
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getFTLAPIPort(){
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local FTLCONFFILE="/etc/pihole/pihole-FTL.conf"
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local DEFAULT_FTL_PORT=4711
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local ftl_api_port
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if [ -s "$FTLCONFFILE" ]; then
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# if FTLPORT is not set in pihole-FTL.conf, use the default port
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ftl_api_port="$({ grep '^FTLPORT=' "${FTLCONFFILE}" || echo "${DEFAULT_FTL_PORT}"; } | cut -d'=' -f2-)"
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# Exploit prevention: set the port to the default port if there is malicious (non-numeric)
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# content set in pihole-FTL.conf
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expr "${ftl_api_port}" : "[^[:digit:]]" > /dev/null && ftl_api_port="${DEFAULT_FTL_PORT}"
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else
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# if there is no pihole-FTL.conf, use the default port
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ftl_api_port="${DEFAULT_FTL_PORT}"
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fi
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echo "${ftl_api_port}"
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}
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#######################
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# returns path of FTL's PID file
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#######################
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getFTLPIDFile() {
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local FTLCONFFILE="/etc/pihole/pihole-FTL.conf"
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local DEFAULT_PID_FILE="/run/pihole-FTL.pid"
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local FTL_PID_FILE
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if [ -s "${FTLCONFFILE}" ]; then
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# if PIDFILE is not set in pihole-FTL.conf, use the default path
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FTL_PID_FILE="$({ grep '^PIDFILE=' "${FTLCONFFILE}" || echo "${DEFAULT_PID_FILE}"; } | cut -d'=' -f2-)"
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else
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# if there is no pihole-FTL.conf, use the default path
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FTL_PID_FILE="${DEFAULT_PID_FILE}"
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fi
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echo "${FTL_PID_FILE}"
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}
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#######################
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# returns FTL's PID based on the content of the pihole-FTL.pid file
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#
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# Takes one argument: path to pihole-FTL.pid
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# Example getFTLPID "/run/pihole-FTL.pid"
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#######################
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getFTLPID() {
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local FTL_PID_FILE="${1}"
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local FTL_PID
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if [ -s "${FTL_PID_FILE}" ]; then
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# -s: FILE exists and has a size greater than zero
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FTL_PID="$(cat "${FTL_PID_FILE}")"
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# Exploit prevention: unset the variable if there is malicious content
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# Verify that the value read from the file is numeric
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expr "${FTL_PID}" : "[^[:digit:]]" > /dev/null && unset FTL_PID
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fi
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# If FTL is not running, or the PID file contains malicious stuff, substitute
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# negative PID to signal this
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FTL_PID=${FTL_PID:=-1}
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echo "${FTL_PID}"
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}
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