Standardize DNS list and write to file for AdminLTE

Signed-off-by: Sylvia van Os <sylvia@hackerchick.me>

automated install/basic-install.sh

@@ -28,6 +28,21 @@ set -e
 # Local variables will be in lowercase and will exist only within functions
 # It's still a work in progress, so you may see some variance in this guideline until it is complete
 
+# List of supported DNS servers
+DNS_SERVERS=$(cat << EOM
+Google (ECS);8.8.8.8;8.8.4.4;2001:4860:4860:0:0:0:0:8888;2001:4860:4860:0:0:0:0:8844
+OpenDNS (ECS);208.67.222.222;208.67.220.220;2620:0:ccc::2;2620:0:ccd::2
+Level3;4.2.2.1;4.2.2.2;;
+Norton;199.85.126.10;199.85.127.10;;
+Comodo;8.26.56.26;8.20.247.20;;
+DNS.WATCH;84.200.69.80;84.200.70.40;2001:1608:10:25:0:0:1c04:b12f;2001:1608:10:25:0:0:9249:d69b
+Quad9 (filtered, DNSSEC);9.9.9.9;149.112.112.112;2620:fe::fe;2620:fe::9
+Quad9 (unfiltered, no DNSSEC);9.9.9.10;149.112.112.10;2620:fe::10;2620:fe::fe:10
+Quad9 (filtered + ECS);9.9.9.11;149.112.112.11;2620:fe::11;
+Cloudflare;1.1.1.1;1.0.0.1;2606:4700:4700::1111;2606:4700:4700::1001
+EOM
+)
+
 # Location for final installation log storage
 installLogLoc=/etc/pihole/install.log
 # This is an important file as it contains information specific to the machine it's being installed on
@@ -902,15 +917,26 @@ setDNS() {
     local DNSSettingsCorrect
 
     # In an array, list the available upstream providers
-    DNSChooseOptions=(Google ""
+    DNSChooseOptions=()
-        OpenDNS ""
+    local DNSServerCount=0
-        Level3 ""
+    # Save the old Internal Field Separator in a variable
-        Comodo ""
+    OIFS=$IFS
-        DNSWatch ""
+    # and set the new one to newline
-        Quad9 ""
+    IFS=$'\n'
-        FamilyShield ""
+    # Put the DNS Servers into an array
-        Cloudflare ""
+    for DNSServer in ${DNS_SERVERS}
-        Custom "")
+    do
+        DNSName="$(cut -d';' -f1 <<< "${DNSServer}")"
+        DNSChooseOptions[DNSServerCount]="${DNSName}"
+        (( DNSServerCount=DNSServerCount+1 ))
+        DNSChooseOptions[DNSServerCount]=""
+        (( DNSServerCount=DNSServerCount+1 ))
+    done
+    DNSChooseOptions[DNSServerCount]="Custom"
+    (( DNSServerCount=DNSServerCount+1 ))
+    DNSChooseOptions[DNSServerCount]=""
+    # Restore the IFS to what it was
+    IFS=${OIFS}
     # In a whiptail dialog, show the options
     DNSchoices=$(whiptail --separate-output --menu "Select Upstream DNS Provider. To use your own, select Custom." ${r} ${c} 7 \
     "${DNSChooseOptions[@]}" 2>&1 >/dev/tty) || \
@@ -920,48 +946,8 @@ setDNS() {
     # Display the selection
     printf "  %b Using " "${INFO}"
     # Depending on the user's choice, set the GLOBAl variables to the IP of the respective provider
-    case ${DNSchoices} in
+    if [[ "${DNSchoices}" == "Custom" ]]
-        Google)
+    then
-            printf "Google DNS servers\\n"
-            PIHOLE_DNS_1="8.8.8.8"
-            PIHOLE_DNS_2="8.8.4.4"
-            ;;
-        OpenDNS)
-            printf "OpenDNS servers\\n"
-            PIHOLE_DNS_1="208.67.222.222"
-            PIHOLE_DNS_2="208.67.220.220"
-            ;;
-        Level3)
-            printf "Level3 servers\\n"
-            PIHOLE_DNS_1="4.2.2.1"
-            PIHOLE_DNS_2="4.2.2.2"
-            ;;
-        Comodo)
-            printf "Comodo Secure servers\\n"
-            PIHOLE_DNS_1="8.26.56.26"
-            PIHOLE_DNS_2="8.20.247.20"
-            ;;
-        DNSWatch)
-            printf "DNS.WATCH servers\\n"
-            PIHOLE_DNS_1="84.200.69.80"
-            PIHOLE_DNS_2="84.200.70.40"
-            ;;
-        Quad9)
-            printf "Quad9 servers\\n"
-            PIHOLE_DNS_1="9.9.9.9"
-            PIHOLE_DNS_2="149.112.112.112"
-            ;;
-        FamilyShield)
-            printf "FamilyShield servers\\n"
-            PIHOLE_DNS_1="208.67.222.123"
-            PIHOLE_DNS_2="208.67.220.123"
-            ;;
-        Cloudflare)
-            printf "Cloudflare servers\\n"
-            PIHOLE_DNS_1="1.1.1.1"
-            PIHOLE_DNS_2="1.0.0.1"
-            ;;
-        Custom)
         # Until the DNS settings are selected,
         until [[ "${DNSSettingsCorrect}" = True ]]; do
             #
@@ -1025,8 +1011,25 @@ setDNS() {
                 fi
             fi
         done
-            ;;
+     else
-    esac
+        # Save the old Internal Field Separator in a variable
+        OIFS=$IFS
+        # and set the new one to newline
+        IFS=$'\n'
+        for DNSServer in ${DNS_SERVERS}
+        do
+            DNSName="$(cut -d';' -f1 <<< "${DNSServer}")"
+            if [[ "${DNSchoices}" == "${DNSName}" ]]
+            then
+                printf "%s\\n" "${DNSName}"
+                PIHOLE_DNS_1="$(cut -d';' -f2 <<< "${DNSServer}")"
+                PIHOLE_DNS_2="$(cut -d';' -f3 <<< "${DNSServer}")"
+                break
+            fi
+        done
+        # Restore the IFS to what it was
+        IFS=${OIFS}
+    fi
 }
 
 # Allow the user to enable/disable logging
@@ -1325,6 +1328,12 @@ installConfigs() {
     printf "\\n  %b Installing configs from %s...\\n" "${INFO}" "${PI_HOLE_LOCAL_REPO}"
     # Make sure Pi-hole's config files are in place
     version_check_dnsmasq
+
+    # Install list of DNS servers
+    # Format: Name;Primary IPv4;Secondary IPv4;Primary IPv6;Secondary IPv6
+    # Some values may be empty (for example: DNS servers without IPv6 support)
+    echo "${DNS_SERVERS}" > "${PI_HOLE_CONFIG_DIR}/dns-servers.conf"
+
     # Install empty file if it does not exist
     if [[ ! -f "${PI_HOLE_CONFIG_DIR}/pihole-FTL.conf" ]]; then
         if ! install -o pihole -g pihole -m 664 /dev/null "${PI_HOLE_CONFIG_DIR}/pihole-FTL.conf" &>/dev/null; then