commit 0cbaeec52cc3dc1335ad922942eaebac00347b06
Author: yulewang <yongw520@gmail.com>
Date:   Sat Jun 30 21:31:20 2018 +0800

    Init

diff --git a/cf-v4-ddns.sh b/cf-v4-ddns.sh
new file mode 100644
index 0000000..659dbc7
--- /dev/null
+++ b/cf-v4-ddns.sh
@@ -0,0 +1,129 @@
+#!/usr/bin/env bash
+set -o errexit
+set -o nounset
+set -o pipefail
+
+# Automatically update your CloudFlare DNS record to the IP, Dynamic DNS
+# Can retrieve cloudflare Domain id and list zone's, because, lazy
+
+# Place at:
+# /usr/local/bin/cf-ddns.sh
+# run `crontab -e` and add next line:
+# 0 * * * * /usr/local/bin/cf-ddns.sh >/dev/null 2>&1
+# or you need log:
+# */1 * * * * /usr/local/bin/cf-ddns.sh >> /var/log/cf-ddns.log 2>&1
+
+
+# Usage:
+# cf-ddns.sh -k cloudflare-api-key \
+#            -u user@example.com \
+#            -h host.example.com \     # fqdn of the record you want to update
+#            -z example.com \          # will show you all zones if forgot, but you need this
+
+# Optional flags:
+#            -f false|true \           # force dns update, disregard local stored ip
+
+# default config
+
+# API key, see https://www.cloudflare.com/a/account/my-account,
+# incorrect api-key results in E_UNAUTH error
+CFKEY=
+
+# Username, eg: user@example.com
+CFUSER=
+
+# Zone name, will list all possible if missing, eg: example.com
+CFZONE_NAME=
+
+# Hostname to update, eg: homeserver.example.com
+CFRECORD_NAME=
+
+# Cloudflare TTL for record, between 120 and 86400 seconds
+CFTTL=120
+
+# Ignore local file, update ip anyway
+FORCE=false
+
+# Site to retrieve WAN ip, other examples are: bot.whatismyipaddress.com, https://api.ipify.org/ ...
+WANIPSITE="http://icanhazip.com"
+
+# get parameter
+while getopts k:u:h:z:f: opts; do
+  case ${opts} in
+    k) CFKEY=${OPTARG} ;;
+    u) CFUSER=${OPTARG} ;;
+    h) CFRECORD_NAME=${OPTARG} ;;
+    z) CFZONE_NAME=${OPTARG} ;;
+    f) FORCE=${OPTARG} ;;
+  esac
+done
+
+# If required settings are missing just exit
+if [ "$CFKEY" = "" ]; then
+  echo "Missing api-key, get at: https://www.cloudflare.com/a/account/my-account"
+  echo "and save in ${0} or using the -k flag"
+  exit 2
+fi
+if [ "$CFUSER" = "" ]; then
+  echo "Missing username, probably your email-address"
+  echo "and save in ${0} or using the -u flag"
+  exit 2
+fi
+if [ "$CFRECORD_NAME" = "" ]; then 
+  echo "Missing hostname, what host do you want to update?"
+  echo "save in ${0} or using the -h flag"
+  exit 2
+fi
+
+# If the hostname is not a FQDN
+if [ "$CFRECORD_NAME" != "$CFZONE_NAME" ] && ! [ -z "${CFRECORD_NAME##*$CFZONE_NAME}" ]; then
+  CFRECORD_NAME="$CFRECORD_NAME.$CFZONE_NAME"
+  echo " => Hostname is not a FQDN, assuming $CFRECORD_NAME"
+fi
+
+# Get current and old WAN ip
+WAN_IP=`curl -s ${WANIPSITE}`
+if [ -f $HOME/.wan_ip-cf.txt ]; then
+  OLD_WAN_IP=`cat $HOME/.wan_ip-cf.txt`
+else
+  echo "No file, need IP"
+  OLD_WAN_IP=""
+fi
+
+# Get zone_identifier & record_identifier
+ID_FILE=$HOME/.id-cf.txt
+if [ -f $ID_FILE ] && [ $(wc -l $ID_FILE | cut -d " " -f 1) == 2 ]; then
+    CFZONE_ID=$(head -1 $ID_FILE)
+    CFRECORD_ID=$(tail -1 $ID_FILE)
+else
+    CFZONE_ID=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones?name=$CFZONE_NAME" -H "X-Auth-Email: $CFUSER" -H "X-Auth-Key: $CFKEY" -H "Content-Type: application/json" | grep -Po '(?<="id":")[^"]*' | head -1 )
+    CFRECORD_ID=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$CFZONE_ID/dns_records?name=$CFRECORD_NAME" -H "X-Auth-Email: $CFUSER" -H "X-Auth-Key: $CFKEY" -H "Content-Type: application/json"  | grep -Po '(?<="id":")[^"]*')
+    echo "$CFZONE_ID" > $ID_FILE
+    echo "$CFRECORD_ID" >> $ID_FILE
+fi
+
+# If WAN IP is unchanged an not -f flag, exit here
+if [ "$WAN_IP" = "$OLD_WAN_IP" ] && [ "$FORCE" = false ]; then
+  echo "WAN IP Unchanged, to update anyway use flag -f true"
+  exit 0
+fi
+
+# If WAN is changed, update cloudflare
+echo "Updating DNS to $WAN_IP"
+
+RESPONSE=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$CFZONE_ID/dns_records/$CFRECORD_ID" \
+  -H "X-Auth-Email: $CFUSER" \
+  -H "X-Auth-Key: $CFKEY" \
+  -H "Content-Type: application/json" \
+  --data "{\"id\":\"$CFZONE_ID\",\"type\":\"A\",\"name\":\"$CFRECORD_NAME\",\"content\":\"$WAN_IP\", \"ttl\":\"$CFTTL\"}")
+
+if [ "$RESPONSE" != "${RESPONSE%success*}" ] && [ $(echo $RESPONSE | grep "\"success\":true") != "" ]; then
+  echo "Updated succesfuly!"
+  echo $RESPONSE
+  echo $WAN_IP > $HOME/.wan_ip-cf.txt
+  exit
+else
+  echo 'Something went wrong :('
+  echo "Response: $RESPONSE"
+  exit 1
+fi
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