Alex_Kleshchukevich: add hw3

Alex_Kleshchukevich/3/addcloudflaredns.sh

@@ -0,0 +1,19 @@
+#!bin/bash
+
+set -o errexit
+set -o nounset
+
+ARYA="arya.ns.cloudflare.com"
+CHANCE="chance.ns.cloudflare.com"
+
+addDns () {
+  if grep -q "$1" /etc/resolv.conf ; then
+    echo "$1 is already present in the file"
+  else
+    echo "$1" >> /etc/resolv.conf
+    echo "$1 added"
+  fi
+}
+
+addDns $ARYA
+addDns $CHANCE

Alex_Kleshchukevich/3/cloudflare_dns.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=Add CloudFlare DNS
+
+[Service]
+ExecStart=bash -c /path/to/register.sh
+Type=oneshot
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target

Alex_Kleshchukevich/3/register.sh

@@ -0,0 +1,121 @@
+#!/bin/bash
+
+set -o errexit
+set -o nounset
+
+AUTH_TOKEN=
+ZONE_ID=
+CONTENT=127.0.0.1
+
+VERIFY_TOKEN=$(curl --silent -X GET "https://api.cloudflare.com/client/v4/user/tokens/verify" \
+ -H "Authorization: Bearer $AUTH_TOKEN" \
+ -H "Content-Type:application/json")
+
+VERIFY_SUCCESS=$(echo $VERIFY_TOKEN | grep -Po '"success":*\K[^,]*')
+
+if [[ $VERIFY_SUCCESS == false ]] ; then
+  VERIFY_ERRORS=$(echo $VERIFY_TOKEN | grep -Po '"errors":\[*\K[^\]]*')
+  echo "Errors: $VERIFY_ERRORS"
+  exit 1
+fi
+
+get_dns_record () {
+  local FQDN=$1
+  local URL="https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records?type=A&name=$FQDN"
+  local RESPONSE=$(curl --silent -X GET "$URL" \
+   -H "Authorization: Bearer $AUTH_TOKEN" \
+   -H "Content-Type:application/json")
+
+  local RESPONSE_COUNT=$(echo $RESPONSE | grep -Po '"count":*\K[^,]*')
+
+  DNS_RECORD_ID=$(echo $RESPONSE | grep -Po '"id":"*\K[^"]*' || true)
+  DNS_CONTENT=$(echo $RESPONSE | grep -Po '"content":"*\K[^"]*' || true)
+
+  if [[ $RESPONSE_COUNT != 0 ]] ; then
+    echo "The record already exists: id=$DNS_RECORD_ID content=$DNS_CONTENT name=$FQDN"
+  else
+    echo "No record found with name=$FQDN"
+  fi
+}
+
+patch_dns_record () {
+  local FQDN=$1
+  local URL="https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/$DNS_RECORD_ID"
+  local RESPONSE=$(curl --silent -X PATCH "$URL" \
+   -H "Authorization: Bearer $AUTH_TOKEN" \
+   -H "Content-Type:application/json" \
+   --data "{\"content\":\"$CONTENT\"}")
+
+  local NEW_DNS_RECORD_ID=$(echo $RESPONSE | grep -Po '"id":"*\K[^"]*')
+  local NEW_DNS_CONTENT=$(echo $RESPONSE | grep -Po '"content":"*\K[^"]*')
+
+  RESPONSE_SUCCESS=$(echo $RESPONSE | grep -Po '"success":*\K[^,]*')
+  if [[ $RESPONSE_SUCCESS == true ]] ; then
+    echo "Successfully updated dns record: id=$NEW_DNS_RECORD_ID content=$NEW_DNS_CONTENT"
+    exit 0
+  else
+    local ERRORS=$(echo $RESPONSE | grep -Po '"errors":\[*\K[^\]]*')
+    echo "Errors: $ERRORS"
+    exit 1
+  fi
+}
+
+post_dns_record () {
+local FQDN=$1
+local PAYLOAD=$(cat <<EOF
+{
+  "type":"A",
+  "name":"$FQDN",
+  "content":"$CONTENT",
+  "ttl":1,
+  "priority":10,
+  "proxied":false
+}
+EOF
+)
+
+  local RESPONSE=$(curl --silent -X POST "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records" \
+    -H "Authorization: Bearer $AUTH_TOKEN" \
+    -H "Content-Type: application/json" \
+   --data "$PAYLOAD")
+
+  local RESPONSE_SUCCESS=$(echo $RESPONSE | grep -Po '"success":*\K[^,]*')
+
+  local NEW_DNS_RECORD_ID=$(echo $RESPONSE | grep -Po '"id":"*\K[^"]*')
+  local NEW_DNS_CONTENT=$(echo $RESPONSE | grep -Po '"content":"*\K[^"]*')
+
+  if [[ $RESPONSE_SUCCESS == true ]] ; then
+    echo "Successfully created dns record: id=$NEW_DNS_RECORD_ID content=$NEW_DNS_CONTENT"
+    exit 0
+  else
+    local ERRORS=$(echo $RESPONSE | grep -Po '"errors":\[*\K[^\]]*')
+    echo "Errors: $ERRORS"
+    exit 1
+  fi
+}
+
+
+register_pi_name () {
+  local FQDN=$1
+
+  if [[ -z "$FQDN" ]]; then
+    echo "No argument supplied"
+    exit 1
+  fi
+
+  get_dns_record $FQDN
+
+  if [[ $DNS_RECORD_ID ]] && [[ $DNS_CONTENT == $CONTENT ]]; then
+    echo "DNS record is in the correct state. Exiting..."
+    exit 0
+  fi
+
+  if [[ $DNS_RECORD_ID ]] && [[ $DNS_CONTENT != $CONTENT ]]; then
+    echo "Need to update IP"
+    patch_dns_record $FQDN
+  fi
+
+  post_dns_record $FQDN
+}
+
+register_pi_name "kleshchukevich.lab.zadeploy.com"