106 lines
4.2 KiB
Bash
Executable File
106 lines
4.2 KiB
Bash
Executable File
#!/bin/bash
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## change to "bin/sh" when necessary
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auth_email="<email>" # The email used to login 'https://dash.cloudflare.com'
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auth_method="<token>" # Set to "global" for Global API Key or "token" for Scoped API Token
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auth_key="<key>" # Your API Token or Global API Key
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zone_identifier="<zone id>" # Can be found in the "Overview" tab of your domain
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record_name="<record>" # Which record you want to be synced
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ttl="120" # Set the DNS TTL (seconds)
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proxy="false" # Set the proxy to true or false
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if [ -n "$1" ]; then
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record_name="$1"
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else
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exit 1
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fi
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###########################################
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## Check if we have a public IP
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###########################################
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ipv4_regex='([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])'
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ip=$(curl -s -4 https://cloudflare.com/cdn-cgi/trace | grep -E '^ip'); ret=$?
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if [[ ! $ret == 0 ]]; then # In the case that cloudflare failed to return an ip.
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# Attempt to get the ip from other websites.
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ip=$(curl -s https://api.ipify.org || curl -s https://ipv4.icanhazip.com)
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else
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# Extract just the ip from the ip line from cloudflare.
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ip=$(echo $ip | sed -E "s/^ip=($ipv4_regex)$/\1/")
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fi
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# Use regex to check for proper IPv4 format.
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if [[ ! $ip =~ ^$ipv4_regex$ ]]; then
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echo "DDNS Updater: Failed to find a valid IP."
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curl -d "DDNS Updater: Failed to find a valid IP." --url https://ntfy.sh/server_errors_1
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exit 2
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fi
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###########################################
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## Check and set the proper auth header
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###########################################
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if [[ "${auth_method}" == "global" ]]; then
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auth_header="X-Auth-Key:"
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else
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auth_header="Authorization: Bearer"
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fi
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###########################################
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## Seek for the A record
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###########################################
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echo "DDNS Updater: Check Initiated"
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record=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records?type=A&name=$record_name" \
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-H "X-Auth-Email: $auth_email" \
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-H "$auth_header $auth_key" \
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-H "Content-Type: application/json")
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###########################################
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## Check if the domain has an A record
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###########################################
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if [[ $record == *"\"count\":0"* ]]; then
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echo "DDNS Updater: Record does not exist, perhaps create one first? (${ip} for ${record_name})"
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curl -d "DDNS Updater: Record does not exist, perhaps create one first? (${ip} for ${record_name})" --url https://ntfy.sh/server_errors_1
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exit 1
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fi
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###########################################
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## Get existing IP
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###########################################
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old_ip=$(echo "$record" | sed -E 's/.*"content":"(([0-9]{1,3}\.){3}[0-9]{1,3})".*/\1/')
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# Compare if they're the same
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if [[ $ip == $old_ip ]]; then
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echo "DDNS Updater: IP ($ip) for ${record_name} has not changed."
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exit 0
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fi
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###########################################
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## Set the record identifier from result
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###########################################
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record_identifier=$(echo "$record" | sed -E 's/.*"id":"(\w+)".*/\1/')
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###########################################
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## Change the IP@Cloudflare using the API
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###########################################
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update=$(curl -s -X PATCH "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records/$record_identifier" \
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-H "X-Auth-Email: $auth_email" \
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-H "$auth_header $auth_key" \
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-H "Content-Type: application/json" \
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--data "{\"type\":\"A\",\"name\":\"$record_name\",\"content\":\"$ip\",\"ttl\":\"$ttl\",\"proxied\":${proxy}}")
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###########################################
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## Report the status
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###########################################
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echo $update
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case "$update" in
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*"\"success\":false"*)
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echo "DDNS Updater: $ip $record_name DDNS failed for $record_identifier ($ip). DUMPING RESULTS:\n$update"
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curl -d "DDNS Updater: $ip $record_name DDNS failed for $record_identifier ($ip). DUMPING RESULTS: $update" --url https://ntfy.sh/server_errors_1
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exit 1;;
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*)
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echo "DDNS Updater: $ip $record_name DDNS updated."
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exit 0;;
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esac
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