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pi-hole
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Update resolver test & added more comments

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* Add/update code comments
* Change resolver check to test for pi.hole
* Make resolver check timeout after 10 seconds
* Use > instead of &> where appropriate
* Make resolver check sleep for 30 seconds (effectively waiting up to 50s for dnsmasq to be resolvable)
* Provide confirmation upon success of resolver check availability
* Quotes and Braced remaining variables as appropriate
* Removed duplicate local
pull/1631/head
WaLLy3K 7 years ago committed by GitHub
parent 7cac207c00
commit 0a00936e99
1 changed files with 34 additions and 24 deletions
Show Stats Download Patch File Download Diff File

58
gravity.sh
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@ -64,26 +64,27 @@ if [[ -r "${piholeDir}/pihole.conf" ]]; then
echo -e " ${COL_LIGHT_RED}Ignoring overrides specified within pihole.conf! ${COL_NC}"
fi
# Attempt to resolve DNS before proceeding with blocklist generation
# Determine if DNS resolution is available before proceeding with retrieving blocklists
gravity_DNSLookup() {
local plu
# Determine if github.com can be resolved
if ! timeout 2 nslookup github.com &> /dev/null; then
# Determine if pi.hole can be resolved
if ! timeout 10 nslookup pi.hole > /dev/null; then
if [[ -n "${secs}" ]]; then
echo -e "${OVER} ${CROSS} DNS resolution is still unavailable, cancelling"
exit 1
fi
# Determine error output message
if pidof dnsmasq &> /dev/null; then
if pidof dnsmasq > /dev/null; then
echo -e " ${CROSS} DNS resolution is temporarily unavailable"
else
echo -e " ${CROSS} DNS service is not running"
"${PIHOLE_COMMAND}" restartdns
fi
secs="15"
# Give time for dnsmasq to be resolvable
secs="30"
while [[ "${secs}" -ne 0 ]]; do
[[ "${secs}" -ne 1 ]] && plu="s" || plu=""
echo -ne "${OVER} ${INFO} Waiting $secs second${plu} before continuing..."
@ -93,6 +94,9 @@ gravity_DNSLookup() {
# Try again
gravity_DNSLookup
elif [[ -n "${secs}" ]]; then
# Print confirmation of resolvability if it had previously failed
echo -e "${OVER} ${TICK} DNS resolution is now available\\n"
fi
}
@ -106,7 +110,7 @@ gravity_Collapse() {
rm "${adListDefault}" 2> /dev/null || \
echo -e " ${CROSS} Unable to remove ${adListDefault}"
elif [[ ! -f "${adListFile}" ]]; then
# Create "adlists.list"
# Create "adlists.list" by copying "adlists.default" from internal Pi-hole repo
cp "${adListRepoDefault}" "${adListFile}" 2> /dev/null || \
echo -e " ${CROSS} Unable to copy ${adListFile##*/} from ${piholeRepo}"
fi
@ -115,11 +119,11 @@ gravity_Collapse() {
echo -ne " ${INFO} ${str}..."
# Retrieve source URLs from $adListFile
# Logic: Remove comments, CR line endings and empty lines
# Awk Logic: Remove comments, CR line endings and empty lines
mapfile -t sources < <(awk '!/^[#@;!\[]/ {gsub(/\r$/, "", $0); if ($1) { print $1 } }' "${adListFile}" 2> /dev/null)
# Parse source domains from $sources
# Logic: Split by folder/port, remove URL protocol & optional username:password@
# Awk Logic: Split by folder/port, remove URL protocol & optional username:password@
mapfile -t sourceDomains < <(
awk -F '[/:]' '{
gsub(/(.*:\/\/|.*:.*@)/, "", $0)
@ -150,9 +154,10 @@ gravity_Supernova() {
saveLocation="${piholeDir}/list.${i}.${domain}.${domainsExtension}"
activeDomains[$i]="${saveLocation}"
# Default user-agent (for Cloudflare's Browser Integrity Check: https://support.cloudflare.com/hc/en-us/articles/200170086-What-does-the-Browser-Integrity-Check-do-)
agent="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2227.0 Safari/537.36"
# Use a case statement to download lists that need special commands
# Provide special commands for blocklists which may need them
case "${domain}" in
"pgl.yoyo.org") cmd_ext="-d mimetype=plaintext -d hostformat=hosts";;
*) cmd_ext="";;
@ -179,9 +184,10 @@ gravity_Pull() {
# Store downloaded content to temp file instead of RAM
patternBuffer=$(mktemp)
heisenbergCompensator=""
if [[ -r "${saveLocation}" ]]; then
# If domain has been saved, add file for date check to only download newer
# Allow curl to determine if a remote file has been modified since last retrieval
heisenbergCompensator="-z ${saveLocation}"
fi
@ -191,7 +197,7 @@ gravity_Pull() {
httpCode=$(curl -s -L ${cmd_ext} ${heisenbergCompensator} -w "%{http_code}" -A "${agent}" "${url}" -o "${patternBuffer}" 2> /dev/null)
# Determine "Status:" output based on HTTP response
case "$httpCode" in
case "${httpCode}" in
"200" ) echo -e "${OVER} ${TICK} ${str} Retrieval successful"; success="true";;
"304" ) echo -e "${OVER} ${TICK} ${str} No changes detected"; success="true";;
"403" ) echo -e "${OVER} ${CROSS} ${str} Forbidden"; success="false";;
@ -201,7 +207,7 @@ gravity_Pull() {
"521" ) echo -e "${OVER} ${CROSS} ${str} Web Server Is Down (Cloudflare)"; success="false";;
"522" ) echo -e "${OVER} ${CROSS} ${str} Connection Timed Out (Cloudflare)"; success="false";;
"500" ) echo -e "${OVER} ${CROSS} ${str} Internal Server Error"; success="false";;
* ) echo -e "${OVER} ${CROSS} ${str} Status $httpCode"; success="false";;
* ) echo -e "${OVER} ${CROSS} ${str} Status ${httpCode}"; success="false";;
esac
# Determine if the blocklist was downloaded and saved correctly
@ -242,14 +248,14 @@ gravity_ParseFileIntoDomains() {
if [[ "${source}" == "${piholeDir}/${matterAndLight}" ]]; then
# Consolidated list parsing: Remove comments and hosts IP's
# Symbols used as comments: #;@![/
# Define symbols used as comments: #;@![/
commentPattern="[#;@![\\/]"
# Logic: Process lines which do not begin with comments
# Awk Logic: Process lines which do not begin with comments
awk '!/^'"${commentPattern}"'/ {
# If there are multiple words seperated by space
if (NF>1) {
# Remove comments (Inc. prefixed spaces/tabs)
# Remove comments (including prefixed spaces/tabs)
if ($0 ~ /'"${commentPattern}"'/) { gsub("( |\t)'"${commentPattern}"'.*", "", $0) }
# Print consecutive domains
if ($3) {
@ -271,8 +277,9 @@ gravity_ParseFileIntoDomains() {
read -r firstLine < "${source}"
# Determine how to parse individual source file formats
# Lists may not capitalise the first line correctly, so compare strings against lower case
if [[ "${firstLine,,}" =~ "adblock" ]] || [[ "${firstLine,,}" =~ "ublock" ]] || [[ "${firstLine,,}" =~ "! checksum" ]]; then
# Logic: Parse Adblock domains & comments: https://adblockplus.org/filter-cheatsheet
# Awk Logic: Parse Adblock domains & comments: https://adblockplus.org/filter-cheatsheet
abpFilter="/^(\\[|!)|^(\\|\\|.*\\^)/"
awk ''"${abpFilter}"' {
# Remove valid adblock type options
@ -338,9 +345,10 @@ gravity_Filter() {
str="Extracting domains from blocklists"
echo -ne " ${INFO} ${str}..."
# Parse files as hosts
# Parse into hosts file
gravity_ParseFileIntoDomains "${piholeDir}/${matterAndLight}" "${piholeDir}/${parsedMatter}"
# Format file line count as currency
num=$(printf "%'.0f" "$(wc -l < "${piholeDir}/${parsedMatter}")")
echo -e "${OVER} ${TICK} ${str}
${INFO} ${COL_LIGHT_BLUE}${num}${COL_NC} domains being pulled in by gravity"
@ -357,6 +365,7 @@ gravity_Unique() {
sort -u "${piholeDir}/${parsedMatter}" > "${piholeDir}/${preEventHorizon}"
echo -e "${OVER} ${TICK} ${str}"
# Format file line count as currency
num=$(printf "%'.0f" "$(wc -l < "${piholeDir}/${preEventHorizon}")")
echo -e " ${INFO} ${COL_LIGHT_BLUE}${num}${COL_NC} unique domains trapped in the Event Horizon"
}
@ -371,6 +380,7 @@ gravity_WhitelistBLD() {
echo -ne " ${INFO} ${str}..."
# Create array of unique $sourceDomains
# Disable SC2046 as quoting will only return first domain
# shellcheck disable=SC2046
read -r -a uniqDomains <<< $(awk '{ if(!a[$1]++) { print $1 } }' <<< "$(printf '%s\n' "${sourceDomains[@]}")")
@ -388,7 +398,7 @@ gravity_Whitelist() {
# Remove anything in whitelist.txt from the Event Horizon
num=$(wc -l < "${whitelistFile}")
plural=; [[ "${num}" != "1" ]] && plural=s
local str="Whitelisting ${num} domain${plural}"
str="Whitelisting ${num} domain${plural}"
echo -ne " ${INFO} ${str}..."
# Print everything from preEventHorizon into whitelistMatter EXCEPT domains in whitelist.txt
@ -429,6 +439,7 @@ gravity_ShowBlockCount() {
# Parse list of domains into hosts format
gravity_ParseDomainsIntoHosts() {
if [[ -n "${IPV4_ADDRESS}" ]] || [[ -n "${IPV6_ADDRESS}" ]]; then
# Awk Logic: Remove CR line endings and print IP before domain if IPv4/6 is used
awk -v ipv4addr="$IPV4_ADDRESS" -v ipv6addr="$IPV6_ADDRESS" '{
sub(/\r$/, "")
if(ipv4addr) { print ipv4addr" "$0; }
@ -447,7 +458,7 @@ gravity_ParseLocalDomains() {
if [[ -f "/etc/hostname" ]]; then
hostname=$(< "/etc/hostname")
elif command -v hostname &> /dev/null; then
elif command -v hostname > /dev/null; then
hostname=$(hostname -f)
else
echo -e " ${CROSS} Unable to determine fully qualified domain name of host"
@ -471,8 +482,7 @@ gravity_ParseBlacklistDomains() {
status="$?"
if [[ "${status}" -ne 0 ]]; then
echo -e " ${CROSS} Unable to move ${accretionDisc} from ${piholeDir}
${output}"
echo -e " ${CROSS} Unable to move ${accretionDisc} from ${piholeDir}\\n ${output}"
gravity_Cleanup "error"
fi
}
@ -507,7 +517,7 @@ gravity_Cleanup() {
# Remove any unused .domains files
for file in ${piholeDir}/*.${domainsExtension}; do
# If list is not in active array, then remove it
if [[ ! "${activeDomains[*]}" =~ ${file} ]]; then
if [[ ! "${activeDomains[*]}" =~ "${file}" ]]; then
rm -f "${file}" 2> /dev/null || \
echo -e " ${CROSS} Failed to remove ${file##*/}"
fi
@ -515,7 +525,7 @@ gravity_Cleanup() {
echo -e "${OVER} ${TICK} ${str}"
[[ -n "$error" ]] && echo ""
[[ -n "${error}" ]] && echo ""
# Only restart DNS service if offline
if ! pidof dnsmasq &> /dev/null; then
@ -523,7 +533,7 @@ gravity_Cleanup() {
fi
# Print Pi-hole status if an error occured
if [[ -n "$error" ]]; then
if [[ -n "${error}" ]]; then
"${PIHOLE_COMMAND}" status
exit 1
fi

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