simple-adblock: allow domains bugfix & canary domains support

* fix bug in download_lists and adb_allow to prevent unintended exclisions from
  the block-lists of domains containing allowed domain. Fixes issue:
  https://github.com/stangri/source.openwrt.melmac.net/issues/160
* add support for returning NXDOMAIN/blocking iCloud & Mozilla canary domains,
  disabled by default

Signed-off-by: Stan Grishin <stangri@melmac.ca>
(cherry picked from commit 9156ef6507)

net/simple-adblock/Makefile

@@ -6,7 +6,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=simple-adblock
 PKG_VERSION:=1.9.1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_MAINTAINER:=Stan Grishin <stangri@melmac.ca>
 PKG_LICENSE:=GPL-3.0-or-later
 

net/simple-adblock/files/simple-adblock.conf

@@ -16,6 +16,8 @@ config simple-adblock 'config'
 #	list force_dns_port '4434'
 #	list force_dns_port '5443'
 #	list force_dns_port '8443'
+	option canary_domains_icloud '0'
+	option canary_domains_mozilla '0'
 	option led 'none'
 	option boot_delay '120'
 	option download_timeout '10'

net/simple-adblock/files/simple-adblock.init

@@ -72,6 +72,9 @@ readonly _WARNING_='\033[0;33mWARNING\033[0m'
 readonly ipset="$(command -v ipset)"
 # shellcheck disable=SC2155
 readonly nft="$(command -v nft)"
+readonly canaryDomainsMozilla='use-application-dns.net'
+readonly canaryDomainsiCloud='mask.icloud.com mask-h2.icloud.com'
+# readonly canaryDomains="$canaryDomainsMozilla $canaryDomainsiCloud"
 
 debug() { local i j; for i in "$@"; do eval "j=\$$i"; echo "${i}: ${j} "; done; }
 
@@ -688,10 +691,17 @@ download_lists() {
 		rm -f "$sharedMemoryError"
 	fi
 
-	for hf in ${blocked_domain}; do echo "$hf" | sed "$domainsFilter" >> $B_TMP; done
+	if [ "$canary_domains_icloud" -ne 0 ]; then
+		canaryDomains="${canaryDomains:+$canaryDomains }${canaryDomainsiCloud}"
+	fi
+	if [ "$canary_domains_mozilla" -ne 0 ]; then
+		canaryDomains="${canaryDomains:+$canaryDomains }${canaryDomainsMozilla}"
+	fi
+
+	for hf in $blocked_domain $canaryDomains; do echo "$hf" | sed "$domainsFilter" >> $B_TMP; done
 	allowed_domain="${allowed_domain}
 $(cat $A_TMP)"
-	for hf in ${allowed_domain}; do hf="$(echo "$hf" | sed 's/\./\\./g')"; w_filter="$w_filter/${hf}$/d;"; done
+	for hf in ${allowed_domain}; do hf="$(echo "$hf" | sed 's/\./\\./g')"; w_filter="$w_filter/^${hf}$/d;/\.${hf}$/d;"; done
 
 	[ ! -s "$B_TMP" ] && return 1
 
@@ -846,7 +856,7 @@ $(cat $A_TMP)"
 }
 
 adb_allow() {
-	local c string="$1"
+	local c hf string="$1"
 	local validation_result="$3"
 	load_environment "$validation_result"
 	if [ ! -s "$outputFile" ]; then
@@ -860,8 +870,9 @@ adb_allow() {
 				output 2 "Allowing domain(s) \\n"
 				for c in $string; do
 					output 2 "  $c "
-					if sed -i "/${string}/d" "$outputFile" && \
-						uci_add_list_if_new "${packageName}" 'config' 'allowed_domain' "$string"; then
+					hf="$(echo "$c" | sed 's/\./\\./g')"
+					if sed -i "/^${hf}$/d;/\.${hf}$/d;" "$outputFile" && \
+						uci_add_list_if_new "${packageName}" 'config' 'allowed_domain' "$c"; then
 							output_ok
 					else
 						output_fail
@@ -1356,6 +1367,8 @@ load_validate_config() {
 	local compressed_cache
 	local ipv6_enabled
 	local allow_non_ascii
+	local canary_domains_icloud
+	local canary_domains_mozilla
 	local config_update_enabled
 	local config_update_url
 	local boot_delay
@@ -1379,6 +1392,8 @@ load_validate_config() {
 		'compressed_cache:bool:0' \
 		'ipv6_enabled:bool:0' \
 		'allow_non_ascii:bool:0' \
+		'canary_domains_icloud:bool:0' \
+		'canary_domains_mozilla:bool:0' \
 		'config_update_enabled:bool:0' \
 		'config_update_url:string:https://cdn.jsdelivr.net/gh/openwrt/packages/net/simple-adblock/files/simple-adblock.conf.update' \
 		'boot_delay:range(0,240):120' \