Sync local IP to Cloudflare DNS on MacOS network change, lets you make your own xip.io but with a static URL

networkchange.sh

#!/bin/bash

CLOUDFLARE_API_KEY=changeme
CLOUDFLARE_DNS_RECORD=*.somewildcard.yourdomain.com
CLOUDFLARE_DNS_RECORD_ID=
CLOUDFLARE_ZONE=yourdomain.com
CLOUDFLARE_ZONE_ID=

if [[ "${CLOUDFLARE_ZONE_ID}" == "" ]]; then
    CLOUDFLARE_ZONES=`curl -s "https://api.cloudflare.com/client/v4/zones" \
         -H "Authorization: Bearer ${CLOUDFLARE_API_KEY}" \
         -H "Content-Type: application/json"`

    CLOUDFLARE_ZONE_ID=`echo ${CLOUDFLARE_ZONES} | jq -r ".result[] | select(.name == \"${CLOUDFLARE_ZONE}\").id"`
fi

if [[ "${CLOUDFLARE_DNS_RECORD_ID}" == "" ]]; then
    CLOUDFLARE_DNS_RECORDS=`curl -s "https://api.cloudflare.com/client/v4/zones/${CLOUDFLARE_ZONE_ID}/dns_records" \
         -H "Authorization: Bearer ${CLOUDFLARE_API_KEY}" \
         -H "Content-Type: application/json"`

    CLOUDFLARE_DNS_RECORD_ID=`echo ${CLOUDFLARE_DNS_RECORDS} | jq -r ".result[] | select(.name == \"${CLOUDFLARE_DNS_RECORD}\").id"`
fi

IP=$(ifconfig | grep -A 2 "en" | grep broadcast | cut -d " " -f 2 | head -n 1)

curl -s -X PATCH "https://api.cloudflare.com/client/v4/zones/${CLOUDFLARE_ZONE_ID}/dns_records/${CLOUDFLARE_DNS_RECORD_ID}" \
     -H "Authorization: Bearer ${CLOUDFLARE_API_KEY}" \
     -H "Content-Type: application/json" \
     -d "{\"content\": \"${IP}\"}"

steve.networkchange.plist

<?xml version="1.0" encoding="UTF-8"?>
<!-- launchctl load ~/Library/LaunchAgents/steve.networkchange.plist -->
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" \
 "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>networkchange</string>
  <key>LowPriorityIO</key>
  <true/>
  <key>ProgramArguments</key>
  <array>
    <string>/Users/steve/Sites/scripts/networkchange.sh</string>
  </array>
  <key>WatchPaths</key>
  <array>
    <string>/etc/resolv.conf</string>
    <string>/var/run/resolv.conf</string>
    <string>/private/var/run/resolv.conf</string>
  </array>
  <key>RunAtLoad</key>
  <true/>
</dict>
</plist>