script: add script to generate DNS TXT record from list of nodes

Author: minh-bq

script/dns.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+
+# Create the DNS TXT record from the list of nodes
+
+unset BOOTNODES
+unset NETWORK
+unset DOMAIN
+unset IP_LIST
+PROGNAME=$(basename "$0")
+
+USAGE="$PROGNAME -b bootnodes -n network -d domain [-i ip_list]
+
+where:
+    bootnodes:  list of bootnodes to crawl from (comma separated)
+    network:    ronin-mainnet | ronin-testnet to choose the network
+    domain:     the DNS domain name
+    ip_list:    the list of IPs to include in ENR tree (comma separated)
+"
+
+set -e
+
+while getopts :hb:n:d:i: option; do
+  case $option in
+    h)
+      echo "$USAGE"
+      exit 0
+      ;;
+    b) BOOTNODES=$OPTARG ;;
+    n) NETWORK=$OPTARG ;;
+    d) DOMAIN=$OPTARG ;;
+    i) IP_LIST=$OPTARG ;;
+    :)
+      echo "$PROGNAME: option requires an argument -- '$OPTARG'" >&2
+      exit 1
+      ;;
+    *)
+      echo "$PROGNAME: bad option -$OPTARG" >&2
+      echo "Try '$PROGNAME -h' for more information" >&2
+      exit 1
+      ;;
+  esac
+done
+shift $((OPTIND - 1))
+
+if [[ -z $BOOTNODES || -z $NETWORK || -z $DOMAIN ]]; then
+  echo "$PROGNAME: missing mandatory option" >&2
+  echo "Try '$(basename "$0") -h' for more information" >&2
+  exit 1
+fi
+
+DNS_DIR=dns_record
+
+if [[ -z $PRIVATE_KEY ]]; then
+  echo "The PRIVATE_KEY environment for signing DNS record must be provided"
+  exit 1
+fi
+
+if [[ -z $PASSWORD ]]; then
+  echo "The PASSWORD environment for decrypting the private key must be provided"
+  exit 1
+fi
+
+echo "$PASSWORD" > password
+echo "$PRIVATE_KEY" > private_key
+unset PASSWORD
+unset PRIVATE_KEY
+
+set -x
+# Create an encrypted keyfile.json
+ethkey generate --passwordfile password --privatekey private_key
+
+devp2p discv4 crawl --timeout 1m --bootnodes $BOOTNODES all_nodes.json
+
+mkdir -p $DNS_DIR
+
+set +x
+IP_LIST_PARAMS=""
+if [[ ! -z $IP_LIST ]]; then
+  IP_LIST_PARAMS="-ip-list $IP_LIST"
+fi
+set -x
+
+devp2p nodeset filter all_nodes.json -eth-network $NETWORK $IP_LIST_PARAMS > $DNS_DIR/nodes.json
+devp2p dns sign $DNS_DIR keyfile.json password --domain $DOMAIN
+devp2p dns to-txt $DNS_DIR $DNS_DIR/txt_record.json
+
+echo "Cleanup files"
+rm private_key
+rm password
+rm keyfile.json