fix: when guessing domain, double check domain returns right ip (#117)

run_node.sh

@@ -2,7 +2,7 @@
 
 echo "I am a nwaku node"
 
-if test -n "${ETH_CLIENT_ADDRESS}" -o ; then
+if [ -n "${ETH_CLIENT_ADDRESS}" ] ; then
     echo "ETH_CLIENT_ADDRESS variable was renamed to RLN_RELAY_ETH_CLIENT_ADDRESS"
     echo "Please update your .env file"
     exit 1
@@ -17,7 +17,7 @@ MY_EXT_IP=$(wget -qO- https://api4.ipify.org)
 DNS_WSS_CMD=
 
 if [ -z "${DOMAIN}" ]; then
-    echo "DOMAIN is unset, trying to guess it"
+    echo "auto-domain: DOMAIN is unset, trying to guess it"
 
     # Check if we have an IP
     IPCHECK=$(echo "${MY_EXT_IP}" | grep -c '^[0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+$')
@@ -25,6 +25,7 @@ if [ -z "${DOMAIN}" ]; then
     if [ "${IPCHECK}"  -ne 1 ]; then
         echo "Failed to get ip, received: '${MY_EXT_IP}'"
     else
+        echo "auto-domain: ip is '${MY_EXT_IP}'"
         # TODO: Include this in nwaku docker image
         apk update
         apk add bind-tools
@@ -39,7 +40,18 @@ if [ -z "${DOMAIN}" ]; then
             echo "Failed to get DNS, received: '${DNS}'"
         else
             DOMAIN=$(echo "${DNS}" | sed s/\.$//)
-           echo "DOMAIN deduced and set to ${DOMAIN}"
+            echo "auto-domain: DOMAIN deduced and set to ${DOMAIN}"
+
+           # Double check the domain is setup to return right IP
+           # OpenDNS servers are used to bypass /etc/hosts as it may return loopback address
+           DNS_IP=$(dig +short @208.67.222.222 "${DNS}")
+
+           if [ "${DNS_IP}" != "${MY_EXT_IP}"  ]; then
+               echo "auto-domain: DNS queried returned a different ip: '${DNS_IP}', unsetting DOMAIN"
+               unset DOMAIN
+           else
+               echo "auto-domain: last verification successful, DOMAIN=${DOMAIN}"
+           fi
         fi
     fi
 fi