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Obtain FTL's PID from the PID file (#4103)

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* Try to obtain FTL's PID from the PID file. If this fails, try to identify the main process using pgrep --oldest (instead of relying on pkill finding the right one by itself). This allows the script to work in even when FTL is running inside the memory checker valgrind.

* Rename FTL_PID -> FTL_PID_FILE

* Remove the pgrep fallback after discussions about that it should be more obvious to users if something strange happened to their PID file. Also, simplify the routine using a bashism in the end.

* Shorten if [[ regex ]]

* Use unset instead of emptying the PID variable

Signed-off-by: DL6ER <dl6er@dl6er.de>

Co-authored-by: Dan Schaper <dan.schaper@pi-hole.net>
This commit is contained in:
DL6ER 2021-04-14 18:33:10 +02:00 committed by GitHub
parent d3e00f038b
commit 5df7ed2f32
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 41 additions and 6 deletions
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@ -16,6 +16,7 @@ readonly PI_HOLE_SCRIPT_DIR="/opt/pihole"
# error due to modifying a readonly variable.
setupVars="/etc/pihole/setupVars.conf"
PI_HOLE_BIN_DIR="/usr/local/bin"
readonly FTL_PID_FILE="/run/pihole-FTL.pid"
readonly colfile="${PI_HOLE_SCRIPT_DIR}/COL_TABLE"
source "${colfile}"
@ -98,8 +99,25 @@ versionFunc() {
exit 0
}
# Get PID of main pihole-FTL process
getFTLPID() {
local pid
if [ -s "${FTL_PID_FILE}" ]; then
# -s: FILE exists and has a size greater than zero
pid="$(<"$FTL_PID_FILE")"
# Exploit prevention: unset the variable if there is malicious content
# Verify that the value read from the file is numeric
[[ "$pid" =~ [^[:digit:]] ]] && unset pid
fi
# If FTL is not running, or the PID file contains malicious stuff, substitute
# negative PID to signal this to the caller
echo "${pid:=-1}"
}
restartDNS() {
local svcOption svc str output status
local svcOption svc str output status pid icon
svcOption="${1:-restart}"
# Determine if we should reload or restart
@ -108,17 +126,34 @@ restartDNS() {
# Note 1: This will NOT re-read any *.conf files
# Note 2: We cannot use killall here as it does
# not know about real-time signals
svc="pkill -RTMIN pihole-FTL"
str="Reloading DNS lists"
pid="$(getFTLPID)"
if [[ "$pid" -eq "-1" ]]; then
svc="true"
str="FTL is not running"
icon="${INFO}"
else
svc="kill -RTMIN ${pid}"
str="Reloading DNS lists"
icon="${TICK}"
fi
elif [[ "${svcOption}" =~ "reload" ]]; then
# Reloading of the DNS cache has been requested
# Note: This will NOT re-read any *.conf files
svc="pkill -HUP pihole-FTL"
str="Flushing DNS cache"
pid="$(getFTLPID)"
if [[ "$pid" -eq "-1" ]]; then
svc="true"
str="FTL is not running"
icon="${INFO}"
else
svc="kill -HUP ${pid}"
str="Flushing DNS cache"
icon="${TICK}"
fi
else
# A full restart has been requested
svc="service pihole-FTL restart"
str="Restarting DNS server"
icon="${TICK}"
fi
# Print output to Terminal, but not to Web Admin
@ -128,7 +163,7 @@ restartDNS() {
status="$?"
if [[ "${status}" -eq 0 ]]; then
[[ -t 1 ]] && echo -e "${OVER} ${TICK} ${str}"
[[ -t 1 ]] && echo -e "${OVER} ${icon} ${str}"
return 0
else
[[ ! -t 1 ]] && local OVER=""