ASUSCOMM-DDNS-Script/ddns-start at main · timeflyingaway/ASUSCOMM-DDNS-Script · GitHub

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#!/bin/sh

ARGS="$*"

log() {
	echo "$*"
	logger -t "$0[$$]" "$*"
}

# Check if recoord is already latest in asuscomm server, 0 for latest, 1 for need update
check_record() {
	#curl -X POST -d "hostname=$HOSTNAME" "https://iplookup.asus.com/nslookup.php"
	RECORD_CMD="curl -s -X POST -d \"hostname=$HOSTNAME\" \"https://iplookup.asus.com/nslookup.php\""
	RECORD="$(echo "$(eval $RECORD_CMD)" | grep "Result" | awk -v RS="[ ,]+" 'BEGIN {print ""} {if (system("ip route get \"" $1 "/32\" >/dev/null 2>&1") == 0) print}')"
	if [ "$(echo "$RECORD" | grep -cx "$IP")" != 1 ] || [ "$(echo "$RECORD" | grep -cx "$IPV6")" != 1 ]; then
		return 1
	fi
	for ip in $RECORD; do
		if [ "$ip" != "$IP" ] && [ "$ip" != "$IPV6" ]; then
			return 1
		fi
	done
	return 0
}

# Set the host name, ending with .asuscomm.com is optional
HOSTNAME="$(nvram get ddns_hostname_x | sed 's/\.asuscomm\.com$//')"

PRODUCTID="$(nvram get productid)"

INNERVER="$(nvram get innerver)"

# The IP address to use
if [ "$(nvram get ddns_realip_x)" == "0" ]; then
	if ip -4 route get $1/32 >/dev/null 2>&1; then
		IP="$1"
	else
		IP="$(nvram get wan_ipaddr | cut -d'/' -f1)"
	fi
	IPV6="$(nvram get ipv6_wan_addr | cut -d'/' -f1)"
else
	IP="$(curl -s https://api-ipv4.ip.sb/ip -A Mozilla)"
	IPV6="$(curl -s https://api-ipv6.ip.sb/ip -A Mozilla)"
fi

# Asus DDNS server
ASUS_SERVER='ns1.asuscomm.com'

# Router MAC address location is hardware dependent
for LAN_MAC_NAME in et0macaddr et1macaddr et2macaddr; do
	MAC_ADDR="$(nvram get "$LAN_MAC_NAME")"
	if [ -n "$MAC_ADDR" ] && [ "$MAC_ADDR" != '00:00:00:00:00:00' ]; then
		break
	fi
done

# Use openssl to generate the password
PASSWORD="$(printf '%s' "${MAC_ADDR//:/}${IP//./}" | openssl md5 -hmac "$(nvram get secret_code)" 2>/dev/null | awk '{print toupper($2)}')"

# Creat force update
if [ "$(nvram get ddns_refresh_x)" != "0" ] && !(cru l | grep -q '#DDNSForceUpdate#'); then
	cru a "DDNSForceUpdate" "29 6 */$(nvram get ddns_refresh_x) * * $0 --force"
	log "creat force update cron job."
fi

# default nvram set le_acme_debug=0
if [ "$(nvram get le_re_ddns)" == "1" ] || [ -f /tmp/acme.txt ]; then
	log "ddns with acme challenge."
	ACME_TXT="$(cat /tmp/acme.txt)"
	if [ -n "$ACME_TXT" ]; then
		ACME_TXT="&acme_challenge=1&txtdata=$ACME_TXT"
	else
		log "unable to get acme challenge txt."
		/sbin/ddns_custom_updated 1
		rm /tmp/acme.txt
		exit 0
	fi
elif [ -n "$(echo " $ARGS " | grep ' --force ')" ]; then
	log "force update."
else
	check_record && log "already latest." && /sbin/ddns_custom_updated 1 && exit 0
fi

if [ "$(nvram get ddns_ipv6_update)" == "1" ]; then
	if ip -6 route get $IPV6/128 >/dev/null 2>&1; then
		IPV6_TXT="&myipv6=$IPV6"
	else
		log "no ipv6 or get wrong ipv6 addr."
	fi
fi

# Try to update
UPDATE_CMD="curl -fs -w 'http_code:%{http_code}' -u \"${MAC_ADDR//:/}:$PASSWORD\" \"https://$ASUS_SERVER/ddns/update.jsp?hostname=$HOSTNAME.asuscomm.com&oldmac=${MAC_ADDR//:/}$ACME_TXT&myip=$IP$IPV6_TXT&model=$PRODUCTID&fw_ver=$INNERVER\""
log "$UPDATE_CMD"
HTTP_RESULT=$(eval "$UPDATE_CMD")
HTTP_CODE="${HTTP_RESULT#*http_code:}"
nvram set ddns_return_code=$HTTP_CODE

# Full code list https://github.com/RMerl/asuswrt-merlin.ng/blob/24569f613492df9c1b428bece93af0f70d010fdc/release/src/router/inadyn/plugins/asuscomm.c#L387
case "$HTTP_CODE" in
	200|220|230)
		log "succeeded with $HTTP_RESULT."
		/sbin/ddns_custom_updated 1
	;;
	*)
		log "failed with $HTTP_RESULT."
		/sbin/ddns_custom_updated 0
	;;
esac